 COMPOSITIONS OF THERMOASSOCIATIVE ADDITIVES WHERE THE ASSOCIATION IS CONTROLLED AND LUBRICATING COMP
专利摘要:
Compositions of additives resulting from the mixture of at least two thermoassociative and exchangeable compounds and at least one boronic ester compound making it possible to control the combination of these two copolymers. A lubricating composition which results from mixing at least one lubricating base oil, at least two thermoassociative and exchangeable compounds and at least one boronic ester compound to control the combination of these two copolymers. A method for modulating the viscosity of a lubricating composition which results from mixing at least one lubricating base oil with at least two thermoassociative and exchangeable compounds. Use of a boronic ester compound for modulating the viscosity of a lubricating composition 公开号:FR3059006A1 申请号:FR1661403 申请日:2016-11-23 公开日:2018-05-25 发明作者:Thibault Derouineau；Fanny BRIAND；Gregory DESCROIX；Renaud Nicolay 申请人:Centre National de la Recherche Scientifique CNRS；Ecole Superieure de Physique et Chimie Industrielles de Ville Paris ；Total Marketing Services SA； IPC主号:
专利说明:
Holder (s): TOTAL MARKETING SERVICES, NATIONAL CENTER FOR SCIENTIFIC RESEARCH Public establishment, HIGHER SCHOOL OF INDUSTRIAL PHYSICS AND CHEMISTRY OF THE CITY OF PARIS. Extension request (s) Agent (s): PACT-IP. THERMOASSOCIATIVE ADDITIVE COMPOSITIONS WHICH ASSOCIATION IS CONTROLLED AND LUBRICATING COMPOSITIONS CONTAINING THEM. FR 3 059 006 - A1 (5 /) Additive compositions resulting from the mixture of at least two thermoassociative and exchangeable compounds and at least one boronic ester compound making it possible to control the association of these two copolymers. Lubricating composition which results from the mixture of at least one lubricating base oil, of at least two thermoassociative and exchangeable compounds and of at least one boronic ester compound making it possible to control the association of these two copolymers. Method for modulating the viscosity of a lubricating composition which results from the mixture of at least one lubricating base oil, of at least two thermoassociative and exchangeable compounds. Use of a boronic ester compound to modulate the viscosity of a lubricating composition. ICG70112 EN text deposit i THERMOASSOCIATIVE ADDITIVE COMPOSITIONS WITH CONTROLLED ASSOCIATION AND LUBRICANT COMPOSITIONS CONTAINING THEM The present invention relates to new additive compositions which result from the mixture of at least two thermoassociative and exchangeable compounds, including at least one copolymer, and at least one boronic ester compound making it possible to control the association of these two thermoassociative compounds. . The invention also relates to a lubricant composition which results from the mixture of at least one lubricating base oil, at least two thermoassociative and exchangeable compounds, including at least one copolymer, and at least one boronic ester compound making it possible to control the association of these two copolymers. The present invention also relates to a method for modulating the viscosity of a lubricating composition which results from the mixture of at least one lubricating base oil, of at least two thermoassociative and exchangeable compounds, including at least one copolymer; as well as the use of a boronic ester compound to modulate the viscosity of a lubricating composition. State of the art High molecular weight polymers are widely used to increase the viscosity of solutions in many fields, such as the petroleum, paper, water treatment, mining, cosmetic, textile and textile industries. generally in all industrial techniques using thickened solutions. However, these polymers of high molar masses have the drawback of exhibiting significant irreversible degradation under mechanical stress compared to the same polymers of smaller sizes. These shear stresses on polymers with high molecular weights cause cuts in the macromolecular chains. The polymer thus degraded sees its thickening properties decrease or disappear, and the viscosity of the solutions containing it drops irreversibly. This loss of shear strength leads to a degradation of the properties of solutions based on polymers of high molecular weights. Applications WO2015 / 110642, WO2015 / 110643 and WO2016113229 a composition resulting from the mixture of at least one copolymer Al resulting from the copolymerization of at least one monomer functionalized with ICG70112 FR text deposit of diol functions and of at least one A2 compound comprising at least two boronic ester functions. These compounds can combine, possibly to form a gel, and exchange chemical bonds in a thermoreversible manner. These additives have the advantage of increasing the viscosity of the solution comprising them when the temperature increases. These polymer compositions have very varied rheological properties depending on the proportion of compounds Al and A2 used. They can also comprise a diol compound which makes it possible to better control the association of the two copolymers. In particular, these polymer compositions can be added to a lubricating oil to lubricate a mechanical part. These copolymers make it possible to formulate lubricating compositions whose viscosity is better controlled compared to the lubricating compositions of the prior art. In particular, these copolymers, when they are introduced into a base oil, tend to reduce the drop in viscosity of the mixture when the temperature increases. The presence of a diol compound in these lubricating compositions makes it possible to better modulate their viscosity. The lubricating compositions are compositions applied between the surfaces, in particular metallic, of moving parts. They reduce friction and wear between two parts in contact and in movement with each other. They also serve to dissipate part of the thermal energy generated by this friction. The lubricant compositions form a protective film between the surfaces of the parts to which they are applied. The compositions used for the lubrication of mechanical parts generally consist of a base oil and additives. Base oil, especially of petroleum or synthetic origin, exhibits variations in viscosity when the temperature is varied. Indeed, when the temperature of a base oil increases, its viscosity decreases and when the temperature of the base oil decreases, its viscosity increases. However, in hydrodynamic lubrication regime, the thickness of the protective film is proportional to the viscosity, therefore also depends on the temperature. A composition has good lubricating properties if the thickness of the protective film remains substantially constant regardless of the conditions and the duration of use of the lubricant. In an internal combustion engine, a lubricant composition can be subjected to external or internal temperature changes. The external temperature changes are due to variations in ambient air temperature, such as temperature variations between summer and winter for example. Changes ICG70112 EN text internal temperature filing result from the implementation of the engine. The temperature of an engine is lower during its start-up phase, especially in cold weather, than during prolonged use. Therefore, the thickness of the protective film may vary in these different situations. There is therefore a need to have a lubricating composition having good lubricating properties and whose viscosity is not very subject to temperature variations. It is known to add additives which improve the viscosity of a lubricating composition. These additives have the function of modifying the rheological behavior of the lubricating composition. They make it possible to promote greater stability of the viscosity over a temperature range at which the lubricating composition is used. For example, these additives limit the decrease in viscosity of the lubricating composition when the temperature rises, while limiting the increase in viscosity when cold. Additives improving viscosity (or additives improving viscosity index) make it possible to guarantee good lubrication by limiting the impact on viscosity when cold and by guaranteeing a minimum thickness of film when hot. Additives improving viscosity. The viscosity enhancing additives currently used are polymers such as copolymer olefins (OCP), and polymethyl alkyl methacrylates (PMA). These polymers have high molecular weights. In general, the contribution of these polymers to viscosity control is all the more important as their molecular weight is high. However, polymers with high molecular weights have the disadvantage of having a low permanent shear resistance compared to polymers of the same nature but of smaller size. However, a lubricating composition is subjected to significant shear stresses in particular in internal combustion engines, where the friction surfaces have a very small spacing and the pressures exerted on the parts are high. These shear stresses on polymers with high molecular weights cause cuts in the macromolecular chains. The polymer thus degraded has its thickening properties reduced, and the viscosity drops irreversibly. This loss of resistance to permanent shear therefore leads to a degradation of the lubricating properties of the lubricating composition. The compositions described in applications WO2015 / 110642, WO2015 / 110643 and WO2016113229 have very interesting properties, due to their ability to form thermoreversible associations, and also due to the possibility of modulating their viscosity by adding a diol compound. ICG70112 FR text deposit The Applicant has now discovered that certain compounds, the boronic esters comprising a single boronic ester function, designated A5 in the following description, also have the property of controlling the association of a copolymer Al resulting from the copolymerization of at least a monomer functionalized with diol functions and at least one compound A2 comprising at least two boronic ester functions. The boronic ester functions of compound A5 compete with the boronic ester functions of compound A2 comprising at least two boronic ester functions. Thus, depending on the temperature and the proportions of Al, A2 and A5, reversible transesterification reactions occur between the diol functions and the boronic ester functions. These reactions lead to products with different structures, with a constant number of ester bonds in the mixture. It is possible to modulate the kinetics and the temperature window for the formation of these associations, therefore to modulate the rheological behavior of the lubricating composition according to the desired use. It is possible, thanks to the compositions of the invention to provide lubricating compositions which have good lubricating properties during the engine start-up phases (cold phase) and good lubricating properties when the engine is running at its temperature. service (hot phase). Summary of the invention The invention relates to a composition resulting from the mixture of at least: - a random polydiol Al copolymer, - a compound A2 comprising at least two boronic ester functions, - an exogenous compound A5 chosen from those corresponding to formula (XI): (xi) in which: Q represents a group chosen from a hydrocarbon group comprising from 1 to 30 carbon atoms, optionally substituted by one or more groups chosen from: a hydroxyl, an -OJ group, ICG70112 FR text deposit -C (O) -O-J with J a hydrocarbon group comprising from 1 to 24 carbon atoms, - G 4 , G5, identical or different, represent groups chosen from a hydrogen atom, a hydrocarbon chain comprising from 1 to 24 carbon atoms, a hydroxyl, a group -OJ, -C (O) -OJ with J a hydrocarbon group comprising from 1 to 24 carbon atoms, - g represents 0 or 1. Advantageously, the exogenous compound A5 corresponds to the formula (XIA): (XIA) in which: - Gi, G 2 , G 3 , G4, G5, identical or different, represent groups chosen from a hydrogen atom, a hydrocarbon chain comprising from 1 to 24 carbon atoms, a hydroxyl, a group -OJ, -C (O) -OJ with J a hydrocarbon group comprising from 1 to 24 carbon atoms, - g represents 0 or 1. According to a preferred embodiment, the molar percentage of exogenous compound A5 relative to the diol functions of the random copolymer Al ranges from 0.025 to 5000%, preferably ranges from 0.1% to 1000%, even more preferably from 0 , 5% to 500%, even more preferably from 1% to 150%. According to a preferred embodiment, the exogenous compound A5 is chosen from those corresponding to formula (XI B): (XI B) ICG70112 FR text deposit According to a still more preferred embodiment, the exogenous compound A5 is chosen from those corresponding to the formula (XI B) with g = 0, G4 = H and G5 represents a C1-C24 alkyl. According to a preferred embodiment, the random copolymer Al results, directly or indirectly, from the copolymerization: at least one first monomer Ml of general formula (I): in which : - Ri is chosen from the group formed by -H, -CH 3 and -CH 2 -CH 3 ; - x is an integer ranging from 1 to 18, preferably from 2 to 18; - y is an integer equal to 0 or 1; - Xi and X 2 , identical or different, are chosen from the group formed by hydrogen, tetrahydropyranyl, methyloxymethyl, terbutyl, benzyl, trimethylsilyl and t-butyl dimethylsilyl; or - Xi and X 2 form with the oxygen atoms a bridge of the following formula In which: - the stars (*) symbolize the bonds to oxygen atoms, - R'2 and R ” 2 , identical or different, are chosen from the group formed by hydrogen and a C1-C11 alkyl, preferably methyl; or - Xi and X 2 form with the oxygen atoms a boronic ester of the following formula: ICG70112 FR text deposit * in which : - the stars (*) symbolize the bonds to oxygen atoms, - R ” 2 is chosen from the group formed by a C6-C30 aryl, a C7-C30 aralkyl and a C 2 -C 3 o alkyl, preferably a Cô-Cis aryl with at least one second monomer M2 of general formula (II): r 3 (Π) in which: - R 2 is chosen from the group formed by -H, -CIR and -CH 2 -CH 3 , - R 3 is chosen from the group formed by a C6-Cig aryl, an aryl in Cô-Cig substituted by a group R ' 3 , -C (O) -O-R' 3 , —O — R ' 3 , —S — R' 3 and -C (O) -N (H) -R ' 3 with R ′ 3 a C 1 -C 30 alkyl group. According to a more preferred embodiment, the random copolymer A1 results, directly or indirectly, from the copolymerization: at least a first monomer Ml of general formula (I), with at least a second monomer M2 of general formula (II): r 3 (Π) in which: - R 2 is chosen from the group formed by -H, -CIR and -CH 2 -CH 3 , R 3 is chosen from the group formed by -C (O) -O-R ' 3 , —O — R' 3 , —S — R ' 3 and -C (O) -N (H) -R' 3 with R ' 3 a group alkyl-C 30, and with at least one third monomer M3 of the formula (X): ICG70112 FR text deposit (X) in which: - Zi, Z 2 , Z 3 , identical or different, represent groups 10 chosen from a hydrogen atom, a C1-C12 alkyl, a group -OZ ’, —C (O) —O — Z’ with Z ’C1-C12 alkyl. According to an even more preferred embodiment, the third monomer M3 is styrene. According to a more preferred embodiment, the random copolymer A1 results, directly or indirectly, from the copolymerization of at least one monomer M1 with at least two monomers M2 having different groups R 3 and at least one monomer M3. According to a first preferred variant, the two monomers M2 of the random copolymer Al have the general formula (II-B): (II-B) in which: - R 2 is chosen from the group formed by -H, -CH 3 and -CH 2 -CH 3; - R '” 3 is a Cg-Cfio alkyl group. According to another preferred variant, one of the monomers M2 of the random copolymer Al has the general formula (II-A): ICG70112 FR text deposit H, C (II-A) in which: - R 2 is chosen from the group formed by -H, -CH 3 and -CH 2 -CH 3 , - R '' 3 is a C1-C6 alkyl group and the other monomer M2 of the random copolymer Al has the general formula (Π-B): H, C (II-B) in which: - R 2 is chosen from the group formed by -H, -CH 3 and -CH 2 -CH 3 , - R '” 3 is a G-Go alkyl group · According to a preferred embodiment, the side chains of the random copolymer Al have an average length ranging from 8 to 20 carbon atoms, preferably from 9 to 18 carbon atoms. According to a preferred embodiment, the random copolymer Al comprises a molar percentage of monomer M3 of formula (X) in said copolymer ranging from 2 to 50%, preferably from 3 to 40%, more preferably ranging from 5 to 35 %. According to a preferred embodiment, the random copolymer Al has a molar percentage of monomer Ml of formula (I) in said copolymer ranging from 1 to 30%, preferably from 5 to 25%. According to a preferred embodiment, the random copolymer Al has a number-average degree of polymerization ranging from 40 to 2000, preferably from 40 to 1000. ICG70112 FR text deposit According to a preferred embodiment, the random copolymer Al has a polydispersity index (Ip) ranging from 1.05 to 4.0; preferably ranging from 1.10 to 3.8. According to a preferred embodiment, the compound A2 is a compound of formula (III): R 4 (' O B — O / B — L R / R 5 (m) in which: - wi and W2, identical or different are whole numbers chosen between 0 and 1; - R4, R5, Rô and R7, identical or different, represent a group chosen from a hydrogen atom, a hydrocarbon group comprising from 1 to 30 carbon atoms, preferably between 4 and 18 carbon atoms, even more preferably between 6 and 14 carbon atoms, said hydrocarbon group being optionally substituted by one or more groups chosen from: a hydroxyl, a group -OJ, -C (O) -OJ with J a hydrocarbon group comprising from 1 to 24 carbon atoms; - L is a divalent linking group chosen from the group formed by a C6-Cis aryl, a C7-C24 aralkyl and a C2-C24 hydrocarbon chain. According to a preferred embodiment, the compound A2 is a random copolymer resulting from the copolymerization of at least one M4 monomer of formula (IV): R10 "f X- (rJ R 11 // ^ R9 H 2 C in which: t is an integer equal to 0 or 1; (IV) FR replacement page NI il - u is an integer equal to 0 or 1; - M and R are linking groups of divalent identical or different, selected from the group consisting of aryl, CO-Ci 8, a C7-C24 alkyl C2-C24, preferably a C 6 -Ci 8 , - X is a function chosen from the group formed by -OC (O) -, C (O) -O-, -C (O) -N (H) -, -N (H) -C (O) -, -S-, -N (H) -, -N (R ' 4 ) - and -O- with R' 4 a hydrocarbon chain comprising from 1 to 15 carbon atoms; - R9 is chosen from the group formed by -H, -CH3 and -CH 2 -CH3; - Rio and Ru, identical or different, represent a group chosen from a hydrogen atom, a hydrocarbon group comprising from 1 to 30 carbon atoms, preferably between 4 and 18 carbon atoms, even more preferably between 6 and 14 carbon atoms , said hydrocarbon group being optionally substituted by one or more groups chosen from: a hydroxyl, a group -OJ, -C (O) —OJ with J a hydrocarbon group comprising from 1 to 24 carbon atoms; with at least one second monomer M5 of general formula (V): H 2 C R 13 (V) in which: - R] 2 is chosen from the group formed by -H, -CH3 and -CH 2 -CH3, - R13 is chosen from the group formed by a C 6 -C 8 aryl, a C 6 -C 8 aryl substituted by a group R'13, -C (O) -O-R'i 3 . -O-R'13, -S-R'13 and -C (O) N (H) -R'i3 with R'13 a C1-C30 alkyl group. According to a preferred embodiment, at least one of the following three conditions is met: • either in formula (IV): u = 1, R9 is H and R 8 represents a C6-Ci 8 aryl or a C7-C 24 aralkyl and the double bond of the M4 monomer of formula (IV) is directly connected to the aryl group; • either in formula (V): R12 represents H and R13 is chosen from the group formed by a C 1 -C 8 aryl and a C 6 -C 8 aryl substituted by a group R'13 with R'13 an alkyl group in Ci-C 2 s and the double bond of the monomer M5 of formula (V) is directly connected to the aryl group; Either the copolymer A2 comprises at least a third monomer M3 of formula (X) ICG70112 FR text deposit in which : -Zi, Z 2 , Z 3 , identical or different, represent, groups chosen from a hydrogen atom, a C1-C12 alkyl, a group -OZ ', -C (O) -OZ' with Z 'a C1-C12 alkyl. Advantageously, when A2 comprises a third monomer M3 of formula (X), this monomer M3 is styrene. Advantageously, the random boronic ester copolymer A2 has a molar percentage of styrenic monomer (s), advantageously styrene, of formula (IV), (V) and / or (X), in said copolymer ranging from 2 to 50 molar%, preferably from 3 to 40%, more preferably from 5 to 35 mol%. According to a preferred embodiment, the chain formed by the chain of the groups Rio, Μ, X and (Rx) ,, with u equal to 0 or 1 of the monomer of general formula (IV) has a total number of atoms. carbon ranging from 8 to 38, preferably from 10 to 26. According to a preferred embodiment, the side chains of the copolymer A2 have an average length greater than or equal to 8 carbon atoms, preferably ranging from 11 to 16 carbon atoms. According to a preferred embodiment, the copolymer A2 has a molar percentage of monomer of formula (IV) in said copolymer ranging from 0.25 to 30%, preferably from 1 to 25%. According to a preferred embodiment, the copolymer A2 has a number-average degree of polymerization ranging from 50 to 1500, preferably from 50 to 800. ICG70112 FR text deposit According to a preferred embodiment, the copolymer A2 has a polydispersity index (Ip) ranging from 1.04 to 3.54; preferably ranging from 1.10 to 3.10. According to a preferred embodiment, the substituents Rio, Ru and the value of the index (t) of the monomer of formula (IV) of the statistical copolymer A2 are identical respectively to the substituents G4, G5 and to the value of the index (g), of the exogenous compound A5 of formula (XI). According to a preferred embodiment, at least one of the substituents Rio, R11 or the value of the index (t) of the monomer of formula (IV) of the random copolymer A2 is different from the substituents G4, G5 respectively or of the value of the index (g), of the exogenous compound A5 of formula (XI). According to a preferred embodiment, the content of copolymer Al ranges from 0.1% to 50% by weight relative to the total weight of the composition. According to a preferred embodiment, the content of compound A2 ranges from 0.1% to 50% by weight relative to the total weight of the composition. According to a preferred embodiment, the mass ratio between the copolymer Al and the compound A2 (ratio A1 / A2) ranges from 0.005 to 200, preferably from 0.05 to 20, even more preferably from 0.1 to 10 . According to a preferred embodiment, the composition also comprises at least one exogenous compound A4 chosen from 1,2-diols and 1,3-diols. According to a preferred embodiment, the lubricating composition resulting from the mixture of at least: - a lubricating oil; and - of a composition as defined above and in detail below. According to a preferred embodiment, the lubricating oil is chosen from oils from group I, group II, group III, group IV, group V of the API classification and one of their mixture. According to a preferred embodiment, the lubricating composition results from mixing with additionally a functional additive chosen from the group formed by ICG70112 FR text deposit antioxidants, detergents, anti-wear additives, extreme pressure additives, polymers improving the viscosity index, pour point improvers, anti-foaming agents, anti-corrosion additives, thickeners, dispersants, friction modifiers and mixtures thereof. The invention also relates to a method for modulating the viscosity of a lubricating composition, the method comprising at least: the supply of a composition as defined above and in detail below, - mixing this composition with a lubricating oil. Detailed description> Composition of additives according to the invention: A first object of the present invention is a composition of associative additives which can be exchanged in a thermoreversible manner and the rate of association of which is controlled by the presence of a so-called exogenous compound, the composition resulting from the mixture of at least: - a random polydiol Al copolymer, a compound A2, in particular a random copolymer A2, comprising at least two boronic ester functions and which can combine with said random copolymer polydiol Al by a transesterification reaction, - an exogenous compound A5 chosen from those corresponding to formula (XI): (xi) in which: - Q represents a group chosen from a hydrocarbon chain comprising from 1 to 30 carbon atoms, optionally substituted by one or more groups chosen from: a hydroxyl, a group -OJ, —C (O) —O — J with J a group hydrocarbon comprising from 1 to 24 ICG70112 FR carbon atoms text deposit, - G4, G5, identical or different, represent groups chosen from a hydrogen atom, a hydrocarbon chain comprising from 1 to 24 carbon atoms, a hydroxyl, a group -OJ, -C (O) -OJ with J a hydrocarbon group comprising from 1 to 24 carbon atoms, - g represents 0 or 1. This composition of additives makes it possible to modulate the rheological behavior of a medium in which it is added. The medium can be a hydrophobic medium, in particular apolar, such as a solvent, a mineral oil, a natural oil, a synthetic oil. o Polydiol Al random copolymers The polydiol Al random copolymer results, directly or indirectly, from the copolymerization of at least one first monomer M1 carrying diol functions, of at least one second monomer M2, with a chemical structure different from that of the monomer Ml, and optionally d '' at least a third monomer M3, chosen from styrene and styrene derivatives. By "results directly or indirectly" is meant that the process for the preparation of the copolymer may comprise one or more distinct stages of the copolymerization, such as a deprotection step. In particular, the copolymerization can optionally be followed by a step of deprotection of the diol functions. Throughout the description, the expressions interchangeably and equivalently are used: "the polydiol Al random copolymer results, directly or indirectly, from the copolymerization" and "the polydiol Al random copolymer results from the copolymerization". By “copolymer” is meant an oligomer or a linear or branched macromolecule having a sequence consisting of several repeating units (or monomer unit) of which at least two units have a different chemical structure. By "monomeric unit" or "monomer" is meant a molecule capable of being converted into an oligomer or a macromolecule by combination with itself or with other molecules of the same type. A monomer designates the smallest constituent unit whose repetition leads to an oligomer or a macromolecule. By “statistical copolymer” is meant an oligomer or a macromolecule in which the sequential distribution of the monomer units obeys known statistical laws. For example, a copolymer is said to be statistical when it is constituted by monomeric units whose distribution is a distribution ICG70112 FR Markovian text deposit. A schematic statistical polymer (PI) is illustrated in FIG. 1. The distribution in the polymer chain of the monomer units depends on the reactivity of the polymerizable functions of the monomers and on the relative concentration of the monomers. The polydiol random copolymers of the invention are distinguished from block copolymers and gradient copolymers. By "block" is meant a part of a copolymer comprising several identical or different monomeric units and which have at least one particularity of constitution or configuration making it possible to distinguish it from its adjacent parts. A schematic block copolymer (P3) is illustrated in FIG. 1. A gradient copolymer designates a copolymer of at least two monomer units of different structures, the monomer composition of which gradually changes along the polymer chain, thereby passing from progressively from one end of the polymer chain rich in a monomer unit, to the other end rich in the other comonomer. A schematic gradient polymer (P2) is illustrated in Figure 1. By "copolymerization" is meant a process which makes it possible to convert a mixture of at least two monomer units of different chemical structures into an oligomer or into a copolymer. In the remainder of the present application “B” represents a boron atom. By “C1-C6 alkyl” is meant a saturated hydrocarbon chain, linear or branched, comprising from i to j carbon atoms. For example, for “CiCio alkyl”, we mean a saturated hydrocarbon chain, linear or branched, comprising from 1 to 10 carbon atoms. By "C x -C y aryl" is meant a functional group which derives from an aromatic hydrocarbon compound comprising from x to y carbon atoms. This functional group can be monocyclic or polycyclic. By way of illustration, a Cô-Cis aryl can be phenyl, naphthalene, anthracene, phenanthrene and tetracene. By “C x -C x alkenyl” is meant a linear or branched hydrocarbon chain comprising at least one unsaturation, preferably a carbon-carbon double bond, and comprising from x to y carbon atoms. By “C x -C y aralkyl” is meant an aromatic hydrocarbon compound, preferably monocyclic, substituted by at least one linear or branched alkyl chain and the total number of carbon atoms of the aromatic ring and of its substituents going from x to y carbon atoms. By way of illustration, a C7-C18 aralkyl can be chosen from the group formed by benzyl, tolyl and xylyl. The term "C x -C y aryl substituted with an R'3 group" means an aromatic hydrocarbon compound, preferably monocyclic, comprising from x to y ICG70112 FR text deposit carbon atoms of which at least one carbon atom of the aromatic ring is substituted by a group R’3. By "Hal" or "halogen" is meant a halogen atom chosen from the group formed by chlorine, bromine, fluorine and iodine. • Monomer Ml The first monomer M1 of the polydiol random copolymer (Al) of the invention has the general formula (I): (I) in which: - Ri is chosen from the group formed by -H, -CH 3 and -CFF-CFF preferably -H and -CH 3 ; - x is an integer ranging from 1 to 18, preferably ranging from 2 to 18; more preferably from 3 to 8; even more preferably x is equal to 4; - y is an integer equal to 0 or 1; preferably y is equal to 0; - Xi and X2, identical or different, are chosen from the group formed by hydrogen, tetrahydropyranyl, methyloxymethyl, ter-butyl, benzyl, trimethylsilyl and t-butyl dimethylsilyl; or - Xi and X2 form with the oxygen atoms a bridge of the following formula: In which: - the stars (*) symbolize the bonds to oxygen atoms, - R’2 and R’L, identical or different, are chosen from the group formed by hydrogen and a C1-C11 alkyl group; or ICG70112 FR text deposit Xi and X 2 form with the oxygen atoms a boronic ester of the following formula: -B; D ”'.K 2 1 / in which: - the stars (*) symbolize the bonds to oxygen atoms, - R '” 2 is chosen from the group formed by a C6-C30 aryl, a C7-C30 aralkyl and a C2-C30 alkyl, preferably a Cô-Cis aryl, more preferably phenyl. Preferably, when R ' 2 and R ” 2 is a C1-C11 alkyl group; the hydrocarbon chain is a linear chain. Preferably, the C1-C11 alkyl group is chosen from the group formed by methyl, ethyl, n-propyl, n-butyl, npentyl, n-hexyl, n-heptyl, n- octyl, n-nonyle, n-decycle and nundecyle. More preferably, the C1-C11 alkyl group is methyl. Preferably, when R '” 2 is a C2-C30 alkyl group; the hydrocarbon chain is a linear chain. Among the monomers of formula (I), the monomers corresponding to formula (ΙΑ) are among the preferred: H, C (I-A) in which: - Ri is chosen from the group formed by -H, -CH 3 and -CH2-CH3 preferably -H and -CH 3 ; - x is an integer ranging from 1 to 18, preferably ranging from 2 to 18; more preferably from 3 to 8; even more preferably x is equal to 4; - y is an integer equal to 0 or 1; preferably y is equal to 0. Among the monomers of formula (I), the monomers corresponding to formula (IB) are among the preferred: ICG70112 FR text deposit (I-B) in which: - Ri is chosen from the group formed by -H, -CH 3 and -CH 2 -CH 3 , preferably -H and -CH 3 ; - x is an integer ranging from 1 to 18, preferably ranging from 2 to 18; more preferably from 3 to 8; even more preferably x is equal to 4; - y is an integer equal to 0 or 1; preferably y is equal to 0; - Yi and Y 2 , identical or different, are chosen from the group formed by tetrahydropyranyl, methyloxymethyl, ter-butyl, benzyl, trimethylsilyl and t-butyl dimethylsilyl; or - Yi and Y 2 form with the oxygen atoms a bridge of the following formula: In which: - the stars (*) symbolize the bonds to oxygen atoms, - R ' 2 and R ” 2 , identical or different, are chosen from the group formed by hydrogen and a C1-Cn alkyl group; or - Yi and Y 2 form with the oxygen atoms a boronic ester of the following formula: in which : - the stars (*) symbolize the bonds to oxygen atoms, - R '” 2 is chosen from the group formed by a Cô-Cis aryl, ICG70112 FR text deposit a C7-C18 aralkyl and a C2-C30 alkyl, preferably a Cô-Cis aryl, more preferably phenyl. Preferably, when R’2 and R ”2 is a C1-C11 alkyl group; the hydrocarbon chain is a linear chain. Preferably, the C1-C11 alkyl group is chosen from the group formed by methyl, ethyl, n-propyl, n-butyl, npentyl, n-hexyl, n-heptyl, n-octyl , n-nonyle, n-decycle and nundecyle. More preferably, the C1-C11 alkyl group is methyl. Preferably, when R ’” 2 is a C2-C30 alkyl group, the hydrocarbon chain is a straight chain. The synthesis of the polydiol random copolymer (Al) may include the copolymerization of monomers (I-B) in protected form with other comonomers, followed by deprotection of the diol functions of the monomers (I-B). • Obtaining the monomer Ml The monomer M1 of general formula formula (I-A) is obtained by deprotection of the alcohol functions of the monomer of general formula (I-B) according to reaction scheme 1 below: (l-B) (l-A) Scheme 1 with Ri, Yi, Y2, x and y as defined in the general formula (IB) described above. The deprotection reaction of the diol functions of the monomer of general formula (IB) is well known to those skilled in the art. He knows how to adapt the reaction deprotection conditions according to the nature of the protective groups Yi and Y 2 . The monomer M1 of general formula (I-B) can be obtained by a reaction of a compound of general formula (I-c) with an alcohol compound of general formula (I-b) according to reaction scheme 2 below: ICG70112 FR text deposit (lb) (lc) (lB) ° Y 2 Diagram 2 in which: - Y 3 is chosen from the group formed by a halogen atom, preferably chlorine, -OH and OC (O) -R'i with R'i chosen from the group formed by -H, -CH 3 and - CH 2 -CH 3 , preferably -H and -CH 3 ; - Ri, Yi, Y 2 , x and y have the same meaning as that given in general formula (IB). These coupling reactions are well known to those skilled in the art. The compound of general formula (I-c) is commercially available from suppliers: Sigma-Aldrich® and Alfa Aesar®. The alcohol compound of general formula (I-b) is obtained from the corresponding polyol of formula (I-a) by protection of the diol functions according to the following reaction scheme 3: ( a) Cb) Scheme 3 with x, y, Yi and Y 2 as defined in the general formula (IB). The reaction for protecting the diol functions of the compound of general formula (Ia) is well known to those skilled in the art. He knows how to adapt the reaction conditions of protection as a function of the nature of the protective groups Yi and Y 2 used. The polyol of general formula (I-a) is commercially available from suppliers: Sigma-Aldrich® and Alfa Aesar®. ICG70112 FR text deposit Examples of synthesis of the monomers M1 are illustrated in the experimental part of applications WO2015 / 110642, WO2015 / 110643 and WO2016113229. • M2 monomer The second monomer of the statistical copolymer of the invention has the general formula (II): H (Π) in which: - R2 is chosen from the group formed by -H, -CH 3 and -CH 2 -CH 3 , preferably -H and -CH 3 ; - R 3 is chosen from the group formed by a C6-Cig aryl group, a C6-Cig aryl substituted by a group R ' 3 , -C (O) -O-R'3; -O-R ' 3 , -SR' 3 and -C (O) -N (H) -R ' 3 , with R' 3 a C1-C30 alkyl group. Preferably, R ′ 3 is a C 1 -C 3 alkyl group whose linear hydrocarbon chain. Among the monomers of formula (II), the monomers corresponding to formula (II-A) are among the preferred: p in which: - R 2 is chosen from the group formed by -H, -CH 3 and -CH 2 -CH 3 , preferably -H and -CH 3 ; - R ” 3 is a C1-C6 alkyl group. By “C1-C6 alkyl group” is meant a saturated, linear or branched hydrocarbon chain comprising from 1 to 8 carbon atoms. Preferably, the hydrocarbon chain is linear. Among the monomers of formula (II), the monomers corresponding to formula (IIB) are also among the preferred: ICG70112 FR text deposit (II-B) in which: - R 2 is chosen from the group formed by -H, -CH 3 and -CH 2 -CH 3 , preferably -H and -CH 3 ; - R '” 3 is a Cg-Cfio alkyl group. By "Cg-C 3 o alkyl group" means a saturated, linear or branched hydrocarbon chain comprising from 9 to 30 carbon atoms. Preferably, the hydrocarbon chain is linear. · Obtaining the M2 monomer The monomers of formula (II), (II-A) and, (II-B) are well known to those skilled in the art. They are marketed by Sigma-Aldrich® and TCI®. • M3 monomer The third optional monomer of the random copolymer of the invention has the general formula (X): in which : - Zi, Z 2 , Z 3 , identical or different, represent groups chosen from a hydrogen atom, a Ci-Ci 2 alkyl, a group -OZ ', —C (O) —O — Z' with Z 'Ci-Ci 2 alkyl. By “C1-C12 alkyl group” is meant a saturated, linear or branched hydrocarbon chain comprising from 1 to 12 carbon atoms. Preferably, the hydrocarbon chain is linear. Preferably, the hydrocarbon chain comprises from 1 to 6 carbon atoms. ICG70112 FR text deposit Advantageously, Zi, Z 2 , Z 3 , identical or different, represent groups chosen from a hydrogen atom, a C 1 -C 6 alkyl, a group -OZ ', —C (O) —O — Z' with Z 'C1-C6 alkyl. More preferably, Z 3 , Z 2 , Z 3 , identical or different, represent 5 groups chosen from a hydrogen atom, a C1-C4 alkyl, a group -OZ ', -C (O) -OZ 'with Z' C1-C4 alkyl. Among the preferred monomers M3, there may be mentioned: styrene, para tert-butyl styrene, para methoxy styrene, para acetoxy styrene, 2,4,6 trimethylstyrene, According to a preferred embodiment M3 is styrene. • Obtaining the M3 monomer Certain monomers of formula (X), such as styrene, para tert-butyl styrene, para methoxy styrene, para acetoxy styrene, 2,4,6 trimethylstyrene are well known to those skilled in the art. They are marketed in particular by Sigma-Aldrich®. Other monomers can be prepared from these commercial monomers by methods of synthesis well known to those skilled in the art. • Preferred polydiol copolymers In one embodiment, a preferred statistical copolymer results from the copolymerization of at least: - A first monomer M1 of general formula (I) as described above; in particular of general formula (I-A) as described previously; - a second monomer M2 of formula (II) as described above, in which R 2 is -CH 3 and R 3 is a group -C (O) -O-R ' 3 with -R' 3 a C1-C alkyl 3 o; - Optionally, a third monomer M3 of general formula (X) as described above; especially styrene. In another embodiment, a preferred statistical copolymer results from the copolymerization of at least: - A first monomer M1 of general formula (I) as described above; in particular of general formula (I-A) as described previously; - a second M2 monomer of formula (Π-B) as described above; ICG70112 FR text deposit a third monomer M2 of formula (II-B) as described above, distinct from the first monomer of formula (II-B); and - A fourth monomer M3 of general formula (X) as described above, in particular styrene. According to this other embodiment, a preferred statistical copolymer results from the copolymerization of at least: - A first monomer M1 of general formula (I) as described above; in particular of general formula (I-A) as described previously; - a second monomer M2 of formula (II-B) in which R 2 is -CH 3 and R '” 3 is a C9-C30 alkyl group, preferably a C9-C30 linear alkyl, even better a linear alkyl C9-C15; - a third monomer M2 of formula (Π-B), distinct from the second monomer of formula (Π-B), in which R 2 is -CH 3 and R '” 3 is a C9-C30 alkyl group, preferably a linear C9-C30 alkyl, more preferably linear C16-C24 alkyl; and - A fourth monomer M3 of general formula (X) as described above, in particular styrene. According to this embodiment, a preferred statistical copolymer results from the copolymerization of at least: - A first monomer M1 of general formula (I) as described above; in particular of general formula (I-A) as described previously; - a second monomer M2 chosen from the group formed by n-decyl methacrylate and n-dodecyl methacrylate; a third monomer M2 chosen from the group formed by palmityl methacrylate, stearyl methacrylate, arachidyl methacrylate and behenyl methacrylate, - Optionally, a fourth monomer M3 of general formula (X) as described above, in particular styrene. In another embodiment, a preferred random copolymer results from the copolymerization of at least: - A first monomer M1 of general formula (I) as described above; in particular of general formula (I-A) as described ICG70112 FR text deposit previously; - a second monomer M2 of formula (Π-A) as described above; and a third M2 monomer of formula (II-B) as described above, - Optionally, a fourth monomer M3 of general formula (X) as described above, in particular styrene. According to this other embodiment, a preferred statistical copolymer results from the copolymerization of at least: - A first monomer M1 of general formula (I) as described above; in particular of general formula (I-A) as described previously; - a second monomer M2 of the formula (II-A) wherein R 2 is -CH 3 and R '3 is alkyl, Ci-Cg, preferably a linear alkyl C-8; - a third monomer M2 of the formula (II-B) wherein R 2 is CH 3 and R "'3 is alkyl C9-C 3 o, preferably a linear alkyl Cg-Crio, - Optionally, a fourth monomer M3 of general formula (X) as described above, in particular styrene. According to this embodiment, a preferred statistical copolymer results from the copolymerization of at least: - A first monomer M1 of general formula (I) as described above; in particular of general formula (I-A) as described previously; - a second monomer M2 which is n-octyl methacrylate; a third monomer M2 chosen from the group formed by palmityl methacrylate, stearyl methacrylate, arachidyl methacrylate and behenyl methacrylate, - Optionally, a fourth monomer M3 of general formula (X) as described above, in particular styrene. · Process for obtaining polydiol copolymers A person skilled in the art is able to synthesize polydiol Al random copolymers using his general knowledge. ICG70112 FR text deposit The copolymerization can be initiated in bulk or in solution in an organic solvent by compounds generating free radicals. For example, the copolymers of the invention are obtained by known methods of radical copolymerization, in particular controlled such as the method called radical polymerization controlled by reversible chain transfer by addition-fragmentation (in English: Réversible Addition-Fragmentation Chain Transfer (RAFT) )) and the method called radical polymerization controlled by atom transfer (in English Atom Transfer Radical Polymerization (ARTP)). Conventional radical polymerization and telomerization can also be used to prepare the copolymers of the invention (Moad, G .; Solomon, DH, The Chemistry of Radical Polymerization. 2nd ed .; Elsevier Ltd: 2006; p 639; Matyaszewski, K .; Davis, TP Handbook of Radical Polymerization; Wiley-Interscience: Hoboken, 2002; p 936). According to a preferred embodiment, the copolymerization is carried out by conventional radical polymerization, without RAFT chain transfer agent. The polydiol Al random copolymer is prepared according to a preparation process which comprises at least one polymerization step (a) in which at least: i) a first monomer M1 of general formula (I) as described above; ii) at least one second monomer M2 of general formula (II) as described above; iii) optionally a third monomer M3 of general formula (X) as described above; iv) at least one source of free radicals. In one embodiment, the method may further comprise v) at least one chain transfer agent. By "a source of free radicals" is meant a chemical compound making it possible to generate a chemical species having one or more electrons unpaired on its outer layer. Those skilled in the art can use any source of free radicals known per se and suitable for polymerization processes, in particular for controlled radical polymerization. Among the free radical sources, benzoyl peroxide, tert-butyl peroxide, diazo compounds such as azobisisobutyronitrile, peroxygen compounds such as persulfates or hydrogen peroxide are preferred, by way of illustration. redox such as the oxidation of Fe 2+ , the persulfate / sodium-metabisulfite mixtures, or the ascorbic acid / hydrogen peroxide or else the compounds which can be cleaved photochemically or by ionizing radiation, for example ultraviolet rays or by beta radiation or gamma. By "chain transfer agent" is meant a compound the purpose of which is ICG70112 FR text deposit to ensure a homogeneous growth of the macromolecular chains by reversible transfer reactions between growing species, i.e. polymer chains terminated by a carbon radical, and dormant species, i.e. polymer chains terminated by a transfer agent. This reversible transfer process makes it possible to control the molecular weights of the copolymers thus prepared. Preferably in the process of the invention, the chain transfer agent comprises a thiocarbonylthio -SC (= S) - group. As an illustration of a chain transfer agent, mention may be made of dithioesters, trithiocarbonates, xanthates and dithiocarbamates. A preferred transfer agent is cumyl dithiobenzoate or 2-cyano-2-propyl benzodithioate. The term “chain transfer agent” also means a compound whose purpose is to limit the growth of the macromolecular chains during formation by adding monomeric molecules and to initiate new chains, which makes it possible to limit the molecular weights final, or even to control them. Such a type of transfer agent is used in telomerization. A preferred transfer agent is cysteamine. In one embodiment, the method for preparing a polydiol random copolymer comprises: at least one polymerization step (a) as defined above, in which the monomers Ml and M2 are chosen with Xi and X 2 represent hydrogen. In one embodiment, the polymerization step (a) comprises bringing at least one monomer M1 into contact with at least two monomers M2 having different R 3 groups and optionally at least one monomer M3, preferably styrene . According to one embodiment (when a radical polymerization has been carried out with a RAFT chain transfer agent), after the direct synthesis of the polymer containing the diol functions, the method comprises a step of removing the end of the RAFT chain by aminolysis then addition of Michael. The preferences and definitions described for the general formulas (I), (I-A), (I30 B), (Π-A), (II-B) and (X) also apply to the methods described above. • Properties of Al polydiol copolymers The polydiol Al random copolymers are linear copolymers. Alternatively, certain monomers could give access to comb copolymers. By "comb copolymers" is meant a copolymer having a main chain (also called a backbone) and side chains. The side chains are ICG70112 FR text deposit pending on either side of the main channel. The length of each side chain is less than the length of the main chain. FIG. 2 schematically represents a comb polymer. The copolymers A1 have a backbone of polymerizable functions, in particular a backbone of methacrylate functions, and optionally of styrene functions, and a mixture of hydrocarbon side chains substituted or not by diol functions. As the monomers of formula (I), (II) and optionally (X) have polymerizable functions of identical or substantially identical reactivity, a copolymer is obtained in which the monomers having diol functions are statistically distributed along the backbone of the copolymer relative to styrenic monomers and with respect to those in which the alkyl chains are unsubstituted by diol functions. Polydiol Al random copolymers have the advantage of being sensitive to external stimuli, such as temperature, pressure, shear speed; this sensitivity translating into a change in properties. In response to a stimulus, the spatial conformation of the copolymer chains is modified and the diol functions are made more or less accessible to association reactions, which can generate crosslinking, as well as exchange reactions. These association and exchange processes are reversible. The random copolymer Al is a heat-sensitive copolymer, that is to say that it is sensitive to temperature changes. Advantageously, the side chains of the polydiol Al random copolymer have an average length ranging from 8 to 20 carbon atoms, preferably from 9 to 18 carbon atoms. By “average side chain length” is meant the average length of the side chains of the monomers M1 of formula (I) and M2 of formula (II) used in the constitution of the copolymer. The side chains from the styrenic monomer or monomers are not taken into account in the calculation of the average lengths of the side chains. A person skilled in the art knows how to obtain this average length by appropriately selecting the types and the ratio of monomers constituting the polydiol random copolymer. The choice of this average chain length makes it possible to obtain a polymer soluble in a hydrophobic medium, whatever the temperature at which the copolymer is dissolved. The polydiol Al random copolymer is therefore miscible in a hydrophobic medium. By “hydrophobic medium” is meant a medium which has no affinity or which has a very low affinity for water, that is to say that it is not miscible in water or in a medium aqueous. ICG70112 FR text deposit Advantageously, the polydiol Al random copolymer has a molar percentage of monomer Ml of formula (I) in said copolymer ranging from 1 to 30%, preferably from 5 to 25%. According to an advantageous embodiment, the random copolymer polydiol Al 5 has a molar percentage of monomer M3 of formula (X), advantageously styrene, in said copolymer ranging from 3 to 40%, more preferably ranging from 5 to 35% . In a preferred embodiment, the polydiol Al random copolymer has a molar percentage of monomer Ml of formula (I) in said copolymer ranging from 1 to 30%, preferably 5 to 25%, a molar percentage of monomer (s) M2 of formula (Π-B) in said copolymer ranging from 0.1 to 95%, preferably from 5 to 80% and a percentage molar of monomer M3 of formula (X), advantageously styrene, in said copolymer ranging from 3 to 40%, more preferably ranging from 5 to 35%. In another preferred embodiment, the polydiol random copolymer A1 has a molar percentage of monomer Ml of formula (I) in said copolymer ranging from 1 to 30%, preferably 5 to 25%, a molar percentage of monomer M2 of formula (Π-A) in said copolymer ranging from 8 to 92% a molar percentage of monomer M2 of formula (Π-B) in said copolymer ranging from 0.1 to 62%, and optionally a molar percentage of monomer M3 of formula ( X), advantageously styrene, in said copolymer ranging from 3 to 40%, more preferably ranging from 5 to 35%. The molar percentage of monomers in the copolymer results directly from the adjustment of the quantities of monomers used for the synthesis of the copolymer. Advantageously, the polydiol Al random copolymer has a number-average degree of polymerization ranging from 40 to 2000, preferably from 40 to 1000. In known manner, the degree of polymerization is controlled using a controlled radical polymerization technique, a technique of telomerization or by adjusting the amount of free radical source when the copolymers of the invention are prepared by conventional radical polymerization. Advantageously, the polydiol Al random copolymer has a polydispersity index (Ip) ranging from 1.05 to 4.0; preferably ranging from 1.10 to 3.8. The polydispersity index is obtained by measurement of steric exclusion chromatography using a poly (methyl methacrylate) calibration. Advantageously, the polydiol Al random copolymer has a number-average molar mass ranging from 5,000 to 400,000 g / mol, preferably from 10,000 to 200,000 g / mol, the number-average molar mass being obtained by measuring ICG70112 FR text deposition size exclusion chromatography using poly (methyl methacrylate) calibration The method of measuring size exclusion chromatography using poly (methyl methacrylate) calibration is described in the work (Fontanille, M .; Gnanou, Y., Chemistry and physical chemistry of polymers. 2nd ed .; Dunod: 2010; p 546). o Compound A2 • Compound A2 boronic diester In one embodiment, the compound A2 comprising two boronic ester functions has the general formula (III): FG O FG B — L R s (III) in which: - wi and w 2 , identical or different are integers equal to 0 or 1, - R4, R5, R6 and R7, identical or different, are chosen from the group formed by hydrogen and a hydrocarbon group comprising from 1 to 30 carbon atoms, preferably between 4 and 18 carbon atoms, even more preferably between 6 and 14 carbon atoms, said hydrocarbon group being optionally substituted by one or more groups chosen from: a hydroxyl, a group -OJ, -C (O) -OJ with J a hydrocarbon group comprising from 1 to 24 carbon atoms; - L is a divalent linking group chosen from the group formed by a C6-Cig aryl, a C7-C24 aralkyl and a C2-C24 hydrocarbon chain, preferably a C6-Cig aryl. By “hydrocarbon group comprising from 1 to 30 carbon atoms”, is meant a linear, branched or cyclic alkyl group comprising from 1 to 30 carbon atoms, linear, branched or cyclic alkenyl comprising from 2 to 30 ICG70112 FR text deposit carbon atoms, an aryl group comprising from 6 to 30 carbon atoms or an aralkyl group comprising from 7 to 30 carbon atoms. By “hydrocarbon group comprising from 1 to 24 carbon atoms” is meant a linear or branched alkyl group, comprising from 1 to 24 carbon atoms or linear or branched alkenyl, comprising from 2 to 24 carbon atoms, an aryl group comprising from 6 to 24 carbon atoms, or an aralkyl group comprising from 7 to 24 carbon atoms. Preferably, J comprises from 4 to 18 carbon atoms, preferably between 6 and 12 carbon atoms. By “C2-C24 hydrocarbon chain” is meant an alkyl or alkenyl group, linear or branched, comprising from 2 to 24 carbon atoms. Preferably, the hydrocarbon chain is a linear alkyl group. Preferably the hydrocarbon chain comprises from 6 to 16 carbon atoms. In one embodiment of the invention, the compound A2 is a compound of general formula (III) above in which: - wi and W2, identical or different are whole numbers equal to 0 or i; - R4 and Rô are identical and are hydrogen atoms; - R5 and R7 are identical and are a hydrocarbon group, preferably a linear alkyl, having from 1 to 24 carbon atoms, preferably from 4 to 18 carbon atoms, preferably from 6 to 16 carbon atoms; - L is a divalent linking group and is a C6-Cis aryl, preferably phenyl. The compound A2 boronic diester of formula (III) as described above is obtained by a condensation reaction between a boronic acid of general formula (III-a) and diol functions of the compounds of general formula (ΙΙΙ-b) and (IIIc) according to reaction scheme 4 below: Diagram 4 with wi, W2, L, R4, R5, Ri and R7, as defined above. ICG70112 FR text deposit Indeed, by condensation of the boronic acid functions of the compound (III-a) with diol functions of the compounds of formula (ΙΙΙ-b) and of formula (III-c), compounds are obtained having two boronic ester functions (compound of formula (III)). This step is carried out according to means well known to those skilled in the art. In the context of the present invention, the compound of general formula (III-a) is dissolved, in the presence of water, in a polar solvent such as acetone. The presence of water makes it possible to shift the chemical equilibria between the molecules of boronic acid of formula (ΙΙΙ-a) and the molecules of boroxin obtained from the boronic acids of formula (ΙΙΙ-a). Indeed, it is well known that boronic acids can spontaneously form boroxin molecules at room temperature. However, the presence of boroxin molecules is not desirable in the context of the present invention. The condensation reaction is carried out in the presence of a dehydrating agent such as magnesium sulfate. This agent makes it possible to trap the water molecules initially introduced as well as those which are released by the condensation between the compound of formula (ΙΙΙ-a) and the compound of formula (ΙΙΙ-b) and between the compound of formula (ΙΙΙ- a) and the compound of formula (III-c). In one embodiment, the compound (ΙΙΙ-b) and the compound (III-c) are identical. A person skilled in the art knows how to adapt the amounts of reagents of formula (ΙΙΙ-b) and / or (III-c) and of formula (ΙΙΙ-a) to obtain the product of formula (III). • Compound A2 random copolymer poly (boronic ester) In another embodiment, the compound A2 comprising at least two boronic ester functions is a random poly (boronic ester) copolymer resulting from the copolymerization of at least one M4 monomer of formula (IV) as described below with at least at least one M5 monomer of formula (V) as described below. In the remainder of the application, the expressions “random copolymer of boronic ester” or “random copolymer of poly (boronic ester)” are equivalent and denote the same copolymer. V Monomer M4 of formula (IV) The monomer M4 of the compound A2 copolymer random boron ester has the general formula (IV) in which: ICG70112 FR text deposit (IV) in which - t is an integer equal to 0 or 1; - u is an integer equal to 0 or 1; - M and Rx are divalent linking groups, identical or different, and are chosen from the group formed by a C 1-6 aryl, a C 7 -C 24 aralkyl and C 2 -C 2 4 alkyl, preferably a C 6 aryl -C18, - X is a function chosen from the group formed by -OC (O) -, C (O) -O-, -C (O) -N (H) -, -N (H) -C (O) -, -S-, -N (H) -, -N (R ' 4 ) and -O- with R'4 a hydrocarbon chain comprising from 1 to 15 carbon atoms; - R9 is chosen from the group formed by -H, -CH 3 and -CH 2 -CH 3 ; preferably -H and -CH 3 ; - Rio and Ru, identical or different, are chosen from the group formed by hydrogen and a hydrocarbon group having from 1 to 30 carbon atoms, optionally substituted by one or more groups chosen from: a hydroxyl, a group -OJ, C (O) —O — J with J a hydrocarbon group comprising from 1 to 24 carbon atoms; By “C1-C24 alkyl” is meant a saturated, linear or branched hydrocarbon chain, comprising from 1 to 24 carbon atoms. Preferably, the hydrocarbon chain is linear. Preferably the hydrocarbon chain comprises from 6 to 16 carbon atoms. By "hydrocarbon chain comprising from 1 to 15 carbon atoms" is meant a linear or branched alkyl or alkenyl group comprising from 1 to 15 carbon atoms. Preferably, the hydrocarbon chain is a linear alkyl group. Preferably, it comprises from 1 to 8 carbon atoms. By “hydrocarbon group comprising from 1 to 30 carbon atoms”, is meant a linear, branched or cyclic alkyl group comprising from 1 to 30 ICG70112 FR text deposit carbon atoms, linear, branched or cyclic alkenyl comprising from 2 to 30 carbon atoms, an aryl group comprising from 6 to 30 carbon atoms or an aralkyl group comprising from 7 to 30 carbon atoms. By “hydrocarbon group comprising from 1 to 24 carbon atoms” is meant a linear or branched alkyl group, comprising from 1 to 24 carbon atoms or linear or branched alkenyl, comprising from 2 to 24 carbon atoms, an aryl group comprising from 6 to 24 carbon atoms, or an aralkyl group comprising from 7 to 24 carbon atoms. Preferably, J comprises from 4 to 18 carbon atoms, preferably between 6 and 12 carbon atoms. In one embodiment, the monomer M4 has the general formula (IV) in which: t is an integer equal to 0 or 1; u is an integer equal to 0 or 1; - M and Rg are divalent linking groups and are different, M is a C6-C12 aryl, preferably phenyl, Rg is a C7-C24 aralkyl, preferably benzyl; X is a function chosen from the group formed by -OC (O) -, —C (O) —O—, -C (O) -N (H) - and -O-, preferably -C (O) - O- or 20 OC (O) -; R 9 is chosen from the group formed by -H, -CH 3 , preferably -H; Rio and Ru are different, one of the groups Rio or Ru is H and the other group Rio or Ru is a hydrocarbon chain, preferably a linear alkyl group, having from 1 to 24 carbon atoms, preferably between 4 and 18 carbon atoms, preferably between 6 and 12 carbon atoms. In one embodiment, the monomer M4 is a styrenic monomer. This is the case when, in formula (IV): u = 1, R 9 is H and Rg represents an aryl in C6-Cis or a C7-C24 aralkyl and the double bond of the monomer M4 of formula (IV) is directly connected to the aryl group. V Synthesis of the M4 monomer of formula (IV) In all the diagrams set out below, unless otherwise indicated, the variables Rio, R11, M, u, t, X, Rg, R'4 and R 9 have the same definition as in formula (IV) above. ICG70112 FR text deposit The monomers M4 of formula (IV) are in particular obtained from a preparation process comprising at least one stage of condensation of a boronic acid of general formula (IV-f) with a diol compound of general formula (IVg) according to reaction scheme 5 below: (IV-f) (IV-g) (iv) Diagram 5 Indeed, by condensation of the boronic acid functions of the compound of formula (IV-f) with diol functions of the compounds of formula (IV-g), a boronic ester compound of formula (IV) is obtained. This step is carried out according to methods well known to those skilled in the art. In the context of the present invention, the compound of general formula (IV-f) is dissolved, in the presence of water, in a polar solvent such as acetone. The condensation reaction takes place in the presence of a dehydrating agent, such as magnesium sulfate. The compounds of formula (IV-g) are commercially available from the following suppliers: Sigma-Aldrich®, Alfa Aesar® and TCI®. The compound of formula (IV-f) is obtained directly from the compound of formula (IV-e) by hydrolysis according to the following reaction scheme 6: Rg R-12 ( R 8J U X / M B — OH / HO (IV-e) ^ = ch 2 (IV-f) Diagram 6 with z an integer equal to 0 or 1; R12 is chosen from the group formed by -H, -CH 3 and -CFL-CIL; u, X, M, R 8 and Rg as defined above. ICG70112 FR text deposit The compound of formula (IV-e) is obtained by reaction of a compound of formula (IV-c) with a compound of formula (IV-d) according to the following reaction scheme 7: (IV-c) Y 5 ( R 8) ii f ~ Ra h 2 c (IV-d) Diagram 7 with B — M (IV-e) M R 8) u ^ -r 9 h 2 c - z, u, Rn, M, R'4, R 9 and Rs as defined above; and in this diagram when: • X represents -O-C (O) -, then Y4 represents an alcohol function -OH or a halogen atom, preferably chlorine or bromine and Y5 is a carboxylic acid function -C (O) -OH; • X represents -C (O) -O-, then Y4 represents a carboxylic acid function -C (O) -OH and Y5 is an alcohol function -OH or a halogen atom, and preferably chlorine or bromine; • X represents -C (O) -N (H) -, then Y4 represents a carboxylic acid function -C (O) -OH or a function -C (O) -Hal, and Y5 is an amine function NH 2 ; • X represents -N (H) -C (O) -, then Y4 represents an amine function NH 2 and Y5 is a carboxylic acid function -C (O) -OH or a function -C (O) -Hal; • X represents -S-, then Y4 is a halogen atom and Y5 is a thiol function -SH or else Y 4 is a thiol function -SH and Y5 is a halogen atom; • X represents -N (H) -, then Y 4 is a halogen atom and Y5 is an amine function -NH 2 or else Y 4 is an amine function -NH 2 and Y5 is a halogen atom; • X represents -N (R ' 4 ) -, then Y 4 is a halogen atom and Y5 is an amine function -N (H) (R' 4 ) or else Y 4 is an amine function -N (H) (R ' 4 ) and Y5 is a halogen atom; • X represents -O-, then Y 4 is a halogen atom and Y5 is an alcohol function -OH or else Y 4 is an alcohol function -OH and Y5 is a halogen atom. These esterification, etherification, thioetherification, alkylation reactions FR text deposit or condensation between an amine function and a carboxylic acid function are well known to those skilled in the art. Those skilled in the art therefore know how to choose the reaction conditions according to the chemical nature of the groups Yi and Y2 to obtain the compound of formula (IV-e). The compounds of formula (IV-d) are commercially available from suppliers: Sigma-Aldrich®, TCI® and Acros Organics®. The compound of formula (IV-c) is obtained by a condensation reaction between a boronic acid of formula (IV-a) with at least one diol compound of formula (IV- b) according to the following reaction scheme 8: Acetone, H 2 O R 12 (t RM HO M X B X ^ Y 4 + I OH 1 1OH OH MgSO 4 z BM '-OY 4 (IV-a) (IV-b) (IV-c) Diagram 8 with M, Y 4 , z and R12 as defined above, Among the compounds of formula (IV-b), the one in which R12 is methyl and z = 0 is preferred. The compounds of formula (IV-a) and (IV-b) are commercially available from suppliers according to Sigma-Aldrich®, Alfa Aesar® and TCI®. V Monomer M5 of general formula (V): The monomer M5 of the compound A2 random copolymer of boronic ester has the general formula (V), R 12 r 13 (V) in which: - R12 is chosen from the group formed by -H, -CH 3 and -CH 2 -CH 3 , preferably -H and -CH 3 ; - R 33 is chosen from the group formed by a Cô-Cis aryl, a Cô-Cis aryl substituted by a group R '33 , -C (O) -O-R'i 3; -O-R'i 3 , -S-R'i 3 and -C (O) -N (H) -R ' i3 with R' 33 a C1-C25 alkyl group. By “C1-C25 alkyl group” is meant a saturated, linear or branched hydrocarbon chain, comprising from 1 to 25 carbon atoms. Preferably, the hydrocarbon chain is linear. ICG70112 FR text deposit By group "aryl in G, -Cix substituted by a group Rn" means an aromatic hydrocarbon compound comprising from 6 to 18 carbon atoms of which at least one carbon atom of the aromatic ring is substituted by a C1-C25 alkyl group as defined above. Among the monomers of formula (V), the monomers corresponding to formula (V-A) are among the preferred: (V-A) in which: R 2 is chosen from the group formed by -H, -CH 3 and -CH 2 -CH 3 , preferably -H and -CH 3 ; R '3 alkyl C1-C25, preferably a linear alkyl C2-5, even more preferred linear alkyl C5-C15. According to one embodiment, the monomer M5 is a styrenic monomer. This is the case when, in formula (V): R | 2 represents H and R 33 is selected from the group consisting of aryl Co-Cis and aryl CO-Cis substituted by a group R '33 R' 33 alkyl, Ci-C 2 5 and the double bond of the monomer M5 of formula (V) is directly connected to the aryl group. Advantageously, according to this embodiment, the monomer M5 is styrene. S Obtaining the M5 monomer: The monomers of formulas (V) and (V-A) are well known to those skilled in the art. They are marketed by Sigma-Aldrich® and TCI®. V Styrenic monomer: Advantageously, the copolymer A2 comprises at least one monomer of styrenic nature, that is to say either styrene, or a derivative of styrene, such as a styrene substituted by another group on the aromatic ring. The monomer M4 can be a styrenic monomer when, in formula (IV): u = 1, R9 is H and Rs represents a Cô-Cis aryl or a C -C 2 aralkyl and the double bond of the M4 monomer of formula (IV) is directly connected to the aryl group. ICG70112 FR text deposit The monomer M5 can also be a styrenic monomer when, in formula (V): R 32 represents H and R13 is chosen from the group formed by a C6-C18 aryl and a C6-Cis aryl substituted by a group R ' 13 with R '13 alkyl, Ci-C2 5 and the double bond of monomer M5 of formula (V) is directly attached to the aryl group. When neither M4 nor M5 have a styrenic character, advantageously, the copolymer A2 comprises at least one third monomer M3 of formula (X) (X) in which: -Zi, Z 2 , Z 3 , identical or different, represent, groups chosen from a hydrogen atom, a C1-C12 alkyl, a group -OZ ', -C (O) -OZ' with Z 'a C1-C12 alkyl. M3 has been described in detail above for the preparation of the copolymer Al. The preferred monomers M3 and their preferred amounts are the same in A2 as in Al. Advantageously, when A2 comprises a third monomer M3 of formula (X), this monomer M3 is styrene. Z Synthesis of compound A2, boronic polyfester random copolymer) A person skilled in the art is able to synthesize random boronic ester copolymers using his general knowledge. The copolymerization can be initiated in bulk or in solution in an organic solvent by compounds generating free radicals. For example, the boronic ester random copolymers are obtained by known methods of radical copolymerization, in particular controlled such as the method called radical polymerization controlled by reversible chain transfer by addition-fragmentation (in English: Réversible Addition-Fragmentation Chain Transfer (RAFT) ) and the method called radical polymerization controlled by atom transfer (in English Atom Transfer) ICG70112 FR text deposit Radical Polymerization (ARTP)). Conventional radical polymerization and telomerization can also be used to prepare the copolymers of the invention (Moad, G .; Solomon, DH, The Chemistry of Radical Polymerization. 2nd ed .; Elsevier Ltd: 2006; p 639; Matyaszewski, K .; Davis, TP Handbook of Radical Polymerization; Wiley-Interscience: Hoboken, 2002; p 936)). The random boronic ester copolymer is prepared according to a process which comprises at least one polymerization stage (a) in which at least: i) a first monomer M4 of general formula (IV) as defined above; ii) at least one second monomer M5 of general formula (V) as defined above: iii) at least one source of free radicals. In one embodiment, the method may further comprise iv) at least one chain transfer agent. The preferences and definitions described for the general formulas (IV) and (V) also apply to the process. The sources of radicals and the transfer agents are those which have been described for the synthesis of polydiol random copolymers. The preferences described for radical sources and transfer agents also apply to this process. V Properties of compounds A2 copolymers random boronic polyfester) Advantageously, the chain formed by the chain of the groups Rio, M, (R 8 ) u with u, an integer equal to 0 or 1, and X of the monomer M4 of general formula (IV) has a total number of atoms carbon ranging from 8 to 38, preferably ranging from 10 to 26. Advantageously, the side chains of the boronic ester random copolymer have an average length greater than 8 carbon atoms, preferably ranging from 11 to 16. This chain length makes it possible to dissolve the boronic ester random copolymer in a hydrophobic medium. By “average side chain length” is meant the average length of the side chains of each monomer constituting the copolymer. The side chains from the styrenic monomer or monomers are not taken into account in the calculation of the average lengths of the side chains. A person skilled in the art knows how to obtain this average length by appropriately selecting the types and the ratio of monomers constituting the random boron ester copolymer. Advantageously, the boronic ester A2 random copolymer has a ICG70112 FR text deposition molar percentage of monomer of formula (IV) in said copolymer ranging from 0.25 to 30%, preferably from 1 to 25%, even better from 5 to 20%. Advantageously, the random boronic ester copolymer A2 has a molar percentage of monomer of formula (IV) in said copolymer ranging from 0.25 to 30%, preferably 1 to 25% and a molar percentage of monomer of formula (V) in said copolymer ranging from 70 to 99.75%, preferably from 75 to 99%. Advantageously, the random boronic ester copolymer A2 has a molar percentage of styrenic monomer (s), of formula (IV), (V) and / or (X), in said copolymer ranging from 2 to 50 mol%, preferably from 3 to 40%, more preferably from 5 to 35 mol%. By “molar percentage of styrenic monomer (s)”, is meant the sum of the contents of each of the styrenic monomers in the random boronic ester copolymer A2, and the styrenic monomers can be: • of formula (IV) when, in formula (IV): u = 1, Rg is H and Rg 15 represents a C6-Cig aryl or a C7-C24 aralkyl and the double bond of the M4 monomer of formula (IV ) is directly connected to the aryl group. • of formula (V) when, in formula (V): R12 represents H and R13 is chosen from the group formed by a Cô-Cig aryl and a Cô-Cig aryl substituted by a group R ' i3 with R' i 3 a C1-C25 alkyl group and the double bond of the monomer M5 of formula (V) is directly connected to the aryl group. and / or • of formula (X), as explained above. Advantageously, the random boronic ester copolymer has a number-average degree of polymerization ranging from 50 to 1500, preferably from 50 to 800. Advantageously, the random boronic ester copolymer has a polydispersity index (Ip) ranging from 1.04 to 3.54; preferably ranging from 1.10 to 3.10. These values are obtained by steric exclusion chromatography using tetrahydrofuran as eluent and a poly (methyl methacrylate) calibration. Advantageously, the random boronic ester copolymer has a number-average molar mass ranging from 10,000 to 200,000 g / mol, preferably from 25,000 to 100,000 g / mol. These values are obtained by steric exclusion chromatography using tetrahydrofuran as eluent and a poly (methyl methacrylate) calibration. Compound A2, in particular the random boronic ester copolymer, has the property of being able to react in a hydrophobic medium, in particular apolar, with a compound carrying diol function (s) by a reaction of ICG70112 EN transesterification text deposit. This transesterification reaction can be represented according to the following diagram 9: R-B HCk z R ' Hcr Thus, during a transesterification reaction, a boronic ester with a chemical structure different from the starting boronic ester is formed by exchange of the hydrocarbon groups symbolized by R and o Exogenous compound A 5 According to the invention, the composition of additives results from the mixture of at least: a random polydiol Al copolymer, a random copolymer A2 comprising at least two boronic ester functions and which can be combined with said random polydiol Al copolymer by at least one transesterification reaction, an exogenous compound A5 chosen from those corresponding to formula (XI): (xi) in which: - Q represents a group chosen from a hydrocarbon group comprising from 1 to 30 carbon atoms, optionally substituted by one or more groups chosen from: a hydroxyl, a group -OJ, -C (O) -OJ with J a hydrocarbon group comprising from 1 to 24 carbon atoms, -G4, G5, identical or different, represent groups chosen from ICG70112 FR text deposit a hydrogen atom, a hydrocarbon chain comprising from 1 to 24 carbon atoms, a hydroxyl, a group -OJ, -C (O) -OJ with J a hydrocarbon group comprising from 1 to 24 carbon atoms , -g represents 0 or 1. By “hydrocarbon group comprising from 1 to 30 carbon atoms” is meant a linear, branched or cyclic alkyl group comprising from 1 to 30 carbon atoms, linear, branched or cyclic alkenyl comprising from 2 to 30 carbon atoms, a group aryl comprising from 6 to 30 carbon atoms or an aralkyl group comprising from 7 to 30 carbon atoms. By “hydrocarbon group comprising from 1 to 24 carbon atoms” is meant a linear or branched alkyl group, comprising from 1 to 24 carbon atoms or linear or branched alkenyl, comprising from 2 to 24 carbon atoms, an aryl group comprising from 6 to 24 carbon atoms, or an aralkyl group comprising from 7 to 24 carbon atoms. Preferably, J comprises from 4 to 18 carbon atoms, preferably between 6 and 12 carbon atoms. Advantageously, the exogenous compound A5 corresponds to the formula (XIA) below: (XIA) in which: - Gi, G 2 , G 3 , G4, G5, identical or different, represent groups chosen from a hydrogen atom, a C1-C24 alkyl, a hydroxyl, a group -OJ, -C (O) -OJ with J C 1 -C 24 alkyl, - g represents 0 or 1. Advantageously, according to this embodiment of the invention, the molar percentage of exogenous compound A5, in the composition of additives, relative to the diol functions of the random copolymer Al ranges from 0.025 to 5000%, preferably ICG70112 FR text deposit from 0.1% to 1000%, even more preferably from 0.5% to 500%, even more preferably from 1% to 150%. By "exogenous compound" is meant within the meaning of the present invention a compound which is added to the composition of additives resulting from the mixture of at least one random copolymer Al polydiol and at least one compound A2, in particular the random copolymer poly (boronic ester). In one embodiment, the exogenous compound A5 is chosen from those corresponding to the formula (XI B): (XI B) in which: - G4, G5, identical or different, represent groups chosen from a hydrogen atom, a C1-C24 alkyl, a hydroxyl, a group -OJ, -C (O) -OJ with J a C1-C24 alkyl , - g represents 0 or 1. In one embodiment, the exogenous compound A5 has the general formula (XI B) in which: - g is an integer equal to 0 or 1; - G4 and G5 are different, one of the groups G4 or G5 is H and the other group G4 or G5 is a hydrocarbon chain, preferably a linear alkyl group, having from 1 to 24 carbon atoms, preferably between 4 and 18 carbon atoms, preferably between 6 and 12 carbon atoms. In one embodiment, the diol fragment A6 of formula (XII), released in situ by the exogenous compound A5 by transesterification reaction, has a chemical structure different from that of the diol compound A3 released in situ by the compound A2 by reaction transesterification. In this embodiment, at least one of ICG70112 FR text deposit substituents G4, G5 or the value of the index (g) of the exogenous compound A5 of formula (XI) is different from the substituents R4 and R5 respectively or from the value of the index (wi) or of the substituents R5 and R7 or of the value of the index (W2) of the A2 boronic diester compound of formula (III) or is respectively different from the substituents Rio, Rn or the value of the index (t) of the monomer (IV) of the poly (boronic ester) random copolymer A2. (ΧΠ) In another embodiment, the diol fragment A6 of formula (XII), released in situ by the exogenous compound A5 by transesterification reaction, has a chemical structure identical to that of the diol compound A3 released in situ by the compound A2 by reaction transesterification. In this embodiment, the substituents G4, G5 and the value of the index (g) of the exogenous compound A5 of formula (XI) is identical respectively to the substituents R4 and R5 and to the value of the index (wi) or to R5 and R7 and to the value of the index (W2) of the compound A2 boronic diester of formula (III) or is identical respectively to the substituents Rio, R11 and to the value of the index (t) of the monomer (IV) of the poly (boronic ester) random copolymer A2. Depending on its temperature of use, the composition of additives resulting from the mixture of at least one random copolymer polydiol Al, of at least one compound A2, in particular a random copolymer A2, comprising at least two boronic ester functions and capable of associating with said random copolymer polydiol Al by a transesterification reaction, and of an addition of at least one exogenous compound A5 as defined above above, may further comprise an A3 diol compound released in situ. In addition, depending on its temperature of use, this same composition can comprise an A6 diol compound released in situ. By “diol released in situ” is meant within the meaning of the present invention the compound carrying a diol function, this compound being produced in the composition of additives during the exchange of the hydrocarbon groups of the boronic ester compound A2, in particular of the random copolymer poly (boronic ester), and / or of the exogenous compound A5 during the transesterification reaction. The random polymer Al polydiol is not a diol released in situ within the meaning of the present invention. The compounds of formula (VI) are commercially available from ICG70112 FR text deposit following suppliers: Sigma-Aldrich®, Alfa Aesar® and TCI®. V Characteristics of the new additive compositions of the invention The additive compositions of the invention resulting from the mixture of at least one polydiol Al random copolymer as defined above, at least one compound A2 as defined above, in particular at least one random poly ( boronic ester) as defined above, and at least one exogenous compound A5 as defined above have very varied rheological properties as a function of the temperature and according to the proportion of the compounds Al, A2 and A5 used. The random polydiol copolymers A1 and the compounds A2 as defined above have the advantage of being associative and of exchanging chemical bonds in a thermoreversible manner, in particular in a hydrophobic medium, in particular a non-polar hydrophobic medium. Under certain conditions, the random polydiol copolymers A1 and the compounds A2 as defined above can be crosslinked. The polydiol Al random copolymers and the A2 compounds also have the advantage of being exchangeable. By "associative" is meant that covalent chemical bonds of the boronic ester type are established between the random polydiol Al copolymers and the compounds A2 comprising at least two boronic ester functions, in particular with the random copolymer poly (boronic ester). Depending on the functionality of the Al polydiols and of the A2 compounds and on the composition of the mixtures, the formation of covalent bonds between the Al polydiols and the A2 compounds may or may not lead to the formation of a three-dimensional polymer network. By “chemical bond” is meant a covalent chemical bond of the boronic ester type. By "exchangeable" is meant that the compounds are capable of exchanging chemical bonds with one another without the total number and the nature of the chemical functions being modified. The chemical exchange reaction (transesterification) is illustrated in the following reaction scheme 10: ICG70112 FR text deposit OH SchémalO with: R a chemical group of the compound Al - the hatched circle symbolizes the rest of the chemical structure of compound A2, - the squared rectangle symbolizes the rest of the chemical structure of the polydiol Al statistical polymer. The boronic ester links of the compounds A2, the boronic ester links formed by transesterification reaction between the diols of the compounds Al and the exogenous compounds A5, as well as the boronic ester links formed by association of the random copolymers polydiols Al and of the compounds A2 exchange with the diol functions carried by the compounds A3 released in situ and with diol functions A6 released by the exogenous compounds A5 to form new boronic esters and new diol functions without the total number of boronic ester functions and diol functions not be affected. This other process of exchange of chemical bonds takes place by metathesis reaction, via successive exchanges of boronic ester functions in the presence of diols. Another chemical link exchange process is illustrated in FIG. 3, in which it can be observed that the random polydiol copolymer Al-1, which was associated with the polymer A2-1, exchanged two boronic ester links with the random boronic ester copolymer. A2-2. The polydiol Al-2 random copolymer, which was associated with the A2-2 polymer, exchanged two boronic ester bonds with the A2-1 boronic ester random copolymer; the total number of boronic ester link in the composition being unchanged and is equal to 4. The copolymer Al-1 is then combined with the polymer A2-2. The Al-2 copolymer is then with the polymer A2-1. The copolymer A2-1 was exchanged with the polymer A22. By “crosslinked” is meant a copolymer in the form of a network obtained by the establishment of bridges between the macromolecular chains of the copolymer. These interconnected chains are mostly distributed in the three dimensions of ICG70112 FR text deposit space. A crosslinked copolymer forms a three-dimensional network. In practice, the formation of a copolymer network is ensured by a solubility test. It can be ensured that a network of copolymers has been formed by placing the network of copolymer in a solvent known to dissolve non-crosslinked copolymers of the same chemical nature. If the copolymer swells instead of dissolving, those skilled in the art know that a network has been formed. Figure 4 illustrates this solubility test. By “crosslinkable” is meant a copolymer capable of being crosslinked. By “reversibly crosslinked” is meant a crosslinked copolymer whose bridges are formed by a reversible chemical reaction. The reversible chemical reaction can move in one direction or another, causing a change in the structure of the polymer network. The copolymer can pass from an initial non-crosslinked state to a crosslinked state (three-dimensional network of copolymers) and from a crosslinked state to an initial non crosslinked state. In the context of the present invention, the bridges which form between the copolymer chains are labile. These bridges can be formed or exchanged thanks to a chemical reaction which is reversible. In the context of the present invention, the reversible crosslinking chemical reaction is a transesterification reaction between diol functions of a random copolymer (copolymer Al) and boronic ester functions of a crosslinking agent (compound A2). The bridges formed are boronic ester type connections. These boronic ester bonds are covalent and labile due to the reversibility of the transesterification reaction. By “thermoreversibly crosslinked”, is meant a copolymer crosslinked by means of a reversible reaction whose displacement in one direction or the other direction is controlled by temperature. The thermoreversible crosslinking mechanism of the composition of the invention is shown diagrammatically in FIG. 5. At low temperature, the polydiol Al copolymer (symbolized by the copolymer carrying functions A in FIG. 5) is not or only slightly crosslinked by the compounds boronic esters A2 (symbolized by the compound carrying functions B in FIG. 5). When the temperature increases, the diol functions of the copolymer Al react with the boronic ester functions of the compound A2 by a transesterification reaction. The random polydiol copolymers A1 and the compounds A2 comprising at least two boronic ester functions then bind together and can be exchanged. Depending on the functionality of the polydiols A1 and of the compounds A2 and on the composition of the mixtures, a gel may form in the medium, especially when the medium is apolar. When the temperature decreases again, the boronic ester bonds between the random polydiol copolymers A1 and the compounds A2 break, and if necessary, the composition loses its gelled character. The quantity of boronic ester bonds (or boronic ester link) which can ICG70112 FR text deposit to be established between the polydiol Al random copolymers and the A2 compounds is adjusted by a person skilled in the art by means of an appropriate selection of the polydiol Al random copolymer, of the A2 compound and of the composition of the mixture. In addition, a person skilled in the art knows how to select the structure of compound A2 as a function of the structure of the random copolymer Al. Preferably, when in the random copolymer Al comprising at least one monomer Ml in which y = l, then the compound A2 of general formula (III) or the copolymer A2 comprising at least one monomer M4 of formula (IV) will preferably be chosen with wi = 1, W2 = l and t = l, respectively. By controlling the association rate of the random polydiol copolymer Al and of the compound A2, in particular of the static poly (boronic ester) copolymer, the viscosity and the rheological behavior of this composition are modulated. When present, the exogenous compound A5 makes it possible to modulate the viscosity of this composition as a function of the temperature and according to the desired use. For the system to work in an associative manner, the compound Al must be present in the composition in the form of a free diol. If Al carried protective groups on the diols, these protective groups must therefore be removed. According to a preferred embodiment, the compound Al is introduced into the composition in the form of the free diol and the compound A2 is introduced into the composition in the form of boronic acid. In a preferred embodiment of the invention, the diol radical of the exogenous compound A5 is of the same chemical nature as the diol compound A3 released in situ by a transesterification reaction between the random copolymer polydiol Al and the compound A2, in particular the random copolymer poly (boronic ester). According to this embodiment, the total amount of free diols is substantially equal to the amount of compound diols released in situ, the compound A5 being capable of comprising a minority part of free diol. By “free diols” is meant the diol functions which are capable of being able to form a chemical bond of the boronic ester type by transesterification reaction. By "total amount of free diols" is meant in the sense of the present application, the total number of diol functions capable of being able to form a chemical bond of boronic ester type by transesterification. The quantity of diols released in situ in the context of the transesterification reactions between Al and A2 is equal to the sum of the number of boronic ester functions linking the copolymers Al and A2 and the number of boronic ester functions connecting the copolymer Al and the ester part boronic from A5. A person skilled in the art knows how to select the chemical structure and the quantity of exogenous A5 compounds which he adds to the composition of additives according to the ICG70112 FR text deposit molar percentage of boronic ester function of the compound A2, in particular as a function of the random poly (boronic ester) copolymer, and of the number of diol functions of the polydiol Al copolymer, to modulate the rheological behavior of the composition. Advantageously, the content of random copolymer Al in the composition ranges from 0.1% to 50.0% by weight relative to the total weight of the composition, preferably ranges from 0.25% to 40% by weight relative to the weight total of the final composition, more preferably from 1% to 30% by weight relative to the total weight of the final composition. Advantageously, the content of compound A2 in the composition ranges from 0.1% to 50.0% by weight relative to the total weight of the composition, preferably ranges from 0.25% to 40% by weight relative to the total weight of the final composition, more preferably preferably from 0.5% to 30% by weight relative to the total weight of the final composition. In one embodiment, the content of random copolymer Al in the composition ranges from 0.5 to 50.0% by weight relative to the total weight of the composition and the content of compound A2, in particular of random copolymer of boronic ester in the composition ranges from 0.5% to 50.0% by weight relative to the total weight of the composition. Preferably, the mass ratio between the polydiol Al statistical compound and the A2 compound (ratio A1 / A2) in the composition ranges from 0.005 to 200, preferably from 0.05 to 20, even more preferably from 0.1 to 10 . In one embodiment, the molar percentage of exogenous compound A5 in the composition of additives ranges from 0.025% to 5000%, preferably ranges from 0.1% to 1000%, more preferably 0.5 to 500%, even more preferably 1% to 150% relative to the diol functions of the polydiol Al random copolymer. In one embodiment, the composition of the invention is in the form of a mother composition. By “mother composition” is meant a composition of which the person skilled in the art can make daughter solutions by withdrawing a certain quantity of mother solution supplemented by the supply of a necessary quantity of diluent (solvent or other) to get a desired concentration. A daughter composition is therefore obtained by dilution of a mother composition. A hydrophobic medium can be a solvent, a mineral oil, a natural oil, a synthetic oil. In one embodiment, the composition of the invention may also comprise at least one additive chosen from the group formed by thermoplastics, ICG70112 FR text deposit elastomers, thermoplastic elastomers, thermosetting polymers, pigments, dyes, fillers, plasticizers, fibers, antioxidants, additives for lubricants, compatibility agents, anti-foaming agents, additives dispersants, adhesion promoters and stabilizers. Other additive - exogenous compound A4 According to one embodiment, the additive composition further comprises, in addition to the compounds Al, A2 and A5, at least one exogenous compound A4 chosen from 1,2-diols and 1,3-diols. Such compounds, as well as their methods of use, are described in detail in application WO2016 / 113229. The exogenous compound A4 may have the general formula (VI): in which : w3 is an integer equal to 0 or 1, Rh and Ris, identical or different, are chosen from the group formed by hydrogen and a hydrocarbon chain having from 1 to 24 carbon atoms, preferably between 4 and 18 carbon atoms, preferably between 6 and 12 carbon atoms. carbon. In the compositions of the invention, the exogenous compound A4 can be used under the same conditions as described in WO2016 / 113229. The compounds of formula (VI) are commercially available from the following suppliers: Sigma-Aldrich®, Alfa Aesar® and TCI®. V Process for the preparation of the new additive compositions of the invention The new additive compositions of the invention are prepared by means well known to those skilled in the art. For example, it is sufficient for a person skilled in the art in particular to: - take a desired amount of a solution comprising the polydiol Al random copolymer as defined above; - take a desired amount of a solution comprising the compound A2 as defined above; in particular a desired amount of a solution comprising the random copolymer poly (boronic ester) as defined above; and ICG70112 FR text deposit - take a desired amount of a solution comprising the exogenous compound A5 as defined above - mix the solutions collected, either simultaneously or sequentially, to obtain the composition of the invention. The order of adding the compounds has no influence in the implementation of the process for preparing the composition of additives. A person skilled in the art also knows how to adjust the different parameters of the composition of the invention to obtain either a composition in which the random polydiol copolymer Al and the compound A2, in particular the random boronic ester copolymer, are combined, or a composition in which the polydiol Al random copolymer and compound A2, in particular the boronic ester random copolymer, are crosslinked and to modulate the association rate or the crosslinking rate for a given temperature of use. For example, the skilled person can adjust in particular: - The molar percentage of monomer M1 carrying diol functions in the random copolymer polydiol Al; - The content of styrenic monomer M3 in the random copolymer polydiol Al; - The molar percentage of monomer M4 carrying boronic ester functions in the random boronic ester copolymer A2; - the average length of the side chains of the polydiol Al random copolymer; - The average length of the side chains of the random boronic ester copolymer A2; - The length of the monomer M4 of the random copolymer boronic ester A2; - The content of styrenic monomer M4 of formula (IV), or M5 of formula (V) or M3 of formula (X) in the random boronic ester copolymer A2; - the length of the boronic diester compound A2; - The number-average degree of polymerization of the polydiol Al random copolymers and the A2 boronic ester random copolymers; - the mass percentage of the polydiol Al random copolymer; - the mass percentage of the boronic diester compound A2; the percentage by mass of the random boronic ester copolymer A2; and optionally : ICG70112 FR text deposit the molar quantity of the exogenous compound A5 relative to the diol functions of the random copolymer polydiol Al, - the chemical nature of the exogenous compound A5; - the molar percentage of exogenous compound A5; - ... V Use of the new compositions of the invention The compositions of the invention can be used in all media whose viscosity varies as a function of temperature. The compositions of the invention make it possible to thicken a fluid and to modulate the viscosity as a function of the temperature of use. The composition of additives according to the invention can be used in fields as varied as improved oil recovery, the paper industry, paints, food additives, cosmetic or pharmaceutical formulation. > Lubricating composition according to the invention Another object of the present invention relates to a lubricating composition resulting from the mixture of at least: a lubricating oil, a random polydiol Al copolymer as defined above, a random copolymer A2, as defined above, comprising at least two boronic ester functions and which can be combined with said random polydiol Al copolymer by at least one transesterification reaction, an exogenous compound A5, chosen from boronic esters of formula (XI), as defined above. The preferences and definitions described for the general formulas (I), (IA), (IB), (II-A), (II-B), (X) also apply to the random copolymer Al polydiol used in the lubricating compositions. of the invention. The preferences and definitions described for general formulas (IV) and (V) also apply to the random copolymer A2 boronic ester used in the lubricant compositions of the invention. The preferences and definitions described for the general formulas (XI) and (XIA) also apply to the exogenous compound A5 used in the lubricant compositions of the invention. The lubricant compositions according to the invention have an inverted behavior with respect to a modification of the temperature with respect to the behavior of the oil. ICG70112 FR basic text repository and rheological additives of polymer type of the prior art and have the advantage that this rheological behavior can be modulated according to the temperature of use. Unlike the base oil which fluidizes when the temperature increases, the compositions of the present invention have the advantage of thickening when the temperature increases. The formation of reversible covalent bonds increases (reversibly) the molecular weight of the polymers and therefore limits the drop in viscosity of the base oil at high temperatures. The additional addition of diol compounds makes it possible to control the rate of formation of these reversible bonds. Advantageously, the viscosity of the lubricating composition is thus controlled and depends less on temperature fluctuations. In addition, for a given temperature of use, it is possible to modulate the viscosity of the lubricating composition and its rheological behavior by varying the amount of A5 boronic ester compounds added to the lubricating composition. o Lubricating oil By “oil” is meant a fatty substance which is liquid at room temperature (25 ° C.) and atmospheric pressure (760 mm Hg evening 10 5 Pa). By “lubricating oil” is meant an oil which attenuates the friction between two moving parts in order to facilitate the operation of these parts. Lubricating oils can be of natural, mineral or synthetic origin. The lubricating oils of natural origin can be oils of vegetable or animal origin, preferably oils of vegetable origin such as rapeseed oil, sunflower oil, palm oil, copra ... Lubricating oils of mineral origin are of petroleum origin and are extracted from petroleum fractions from the atmospheric and vacuum distillation of crude oil. The distillation can be followed by refining operations such as solvent extraction, dealpumping, solvent dewaxing, hydrotreating, hydrocracking, hydroisomerization, hydrofinishing ... By way of illustration, it is possible to cite paraffinic mineral base oils such as Bright Stock Solvent oil (BSS), naphthenic mineral base oils, aromatic mineral oils, hydrorefined mineral bases whose viscosity index is approximately 100, mineral bases hydrocracked whose viscosity index is between 120 and 130, hydroisomerized mineral bases whose viscosity index is between 140 and 150. Lubricating oils of synthetic origin (or synthetic base) come as their name suggests from chemical synthesis such as addition ICG70112 FR text deposition of a product on itself or polymerization, or the addition of a product on another such as esterification, alkylation, fluorination, etc., of components originating from petrochemistry, carbochemistry , and mineral chemistry such as: olefins, aromatics, alcohols, acids, halogenated, phosphorus, silicon compounds, etc. By way of illustration, we can cite: synthetic oils based on synthetic hydrocarbons such as polyalphaolefins (PAO), internal polyolefins (PIO), polybutenes and polyisobutenes (PIB), dialkylbenenes, alkylated polyphenyls; synthetic oils based on esters such as esters of diacids, esters of neopolyols; synthetic oils based on polyglycols such as monoalkylene glycols, polyalkylene glycols and polyalkylene glycol monoethers; synthetic oils based on phosphate esters; - synthetic oils based on silicon derivatives such as silicone oils or polysiloxanes. The lubricating oils which can be used in the composition of the invention can be chosen from any group I to V oils specified in the API directives (Base Oil Interchangeability Guidelines of the American Petroleum Institute (API) ) (or their equivalents according to the ATIEL classification (Technical Association of the European Lubricants Industry) as summarized below: Contentcompoundssaturated * Contentsulfur** Indexviscosity(VI) *** Group I Mineral oils <90% > 0.03% 80 <VI <120 Group II Oilshydrocracked > 90% <0.03% 80 <VI <120 Group IIIHydrocracked or hy dro-i oils > 90% <0.03% > 120 Group IV (PAO) Polyalphaolefins Group V Esters and other bases not included in basesgroups I to IV measured in accordance with ASTM D2007 ** measured in accordance with ASTM D2622, ASTM D4294, ASTM D4927 and ASTM ICG70112 FR text deposit D3120 *** measured according to ASTM D2270 The compositions of the invention may include one or more lubricating oils. The lubricating oil or the lubricating oil mixture is the main ingredient in the lubricating composition. This is called a lubricating base oil. By majority ingredient is meant that the lubricating oil or the mixture of lubricating oils represents at least 51% by weight relative to the total weight of the composition. Preferably, the lubricating oil or the mixture of lubricating oils represents at least 70% by weight relative to the total weight of the composition. In one embodiment of the invention, the lubricating oil is chosen from the group formed by oils of group I, group II, group III, group IV, group V of the API classification and one of their mixture. Preferably, the lubricating oil is chosen from the group formed by oils from group III, from group IV, from group V of the API classification and their mixture. Preferably, the lubricating oil is an oil of group III of the API classification. The lubricating oil has a kinematic viscosity at 100 ° C., measured according to standard ASTM D445, ranging from 2 to 150 cSt, preferably ranging from 2 to 15 cSt. o Functional additives In one embodiment, the composition of the invention may also comprise one or more functional additives chosen from the group formed by detergents, anti-wear additives, extreme pressure additives, antioxidants, polymers improving the index viscosity, pour point improvers, defoamers, thickeners, anti-corrosion additives, dispersants, friction modifiers and their mixtures. The functional additive (s) which are added to the composition of the invention are chosen according to the end use of the lubricating composition. These additives can be introduced in two different ways: either each additive is added individually and sequentially in the composition, or all the additives are added simultaneously in the composition, the additives are in this case generally available in the form of a package, called additive package. The functional additive or mixtures of functional additives, when present, represent from 0.1 to 10% by weight relative to the total weight of the composition. ICG70112 FR text deposit V Detergents: These additives reduce the formation of deposits on the surface of metal parts by dissolving secondary oxidation and combustion products. The detergents which can be used in the lubricant compositions according to the present invention are well known to those skilled in the art. The detergents commonly used in the formulation of lubricating compositions are typically anionic compounds comprising a long lipophilic hydrocarbon chain and a hydrophilic head. The associated cation is typically a metal cation of an alkaline or alkaline earth metal. The detergents are preferably chosen from the alkali or alkaline earth metal salts of carboxylic acids, sulfonates, salicylates, naphthenates, as well as the phenate salts. The alkali and alkaline earth metals are preferably calcium, magnesium, sodium or barium. These metal salts may contain the metal in an approximately stoichiometric amount or in excess (in an amount greater than the stoichiometric amount). In the latter case, we are dealing with so-called overbased detergents. The excess metal providing the overbased character to the detergent is in the form of oil-insoluble metal salts, for example carbonate, hydroxide, oxalate, acetate, glutamate, preferably carbonate. V Anti-wear additives and extreme pressure additives: These additives protect friction surfaces by forming a protective film adsorbed on these surfaces. There are a wide variety of antiwear and extreme pressure additives. By way of illustration, mention may be made of phosphosulfur additives such as metal alkylthiophosphates, in particular zinc alkylthiophosphates, and more specifically zinc dialkyldithiophosphates or ZnDTP, amine phosphates, poly sulfides, in particular sulfur olefins and metal dithiocarbamates. V Antioxidants: These additives delay the degradation of the composition. Degradation of the composition can result in the formation of deposits, the presence of sludge, or an increase in the viscosity of the composition. Antioxidants act as radical inhibitors or destroyers of hydroperoxides. Among the antioxidants commonly used are phenolic or amino antioxidants. ICG70112 FR text deposit V Anti-corrosion: These additives cover the surface of a film which prevents oxygen from reaching the surface of the metal. They can sometimes neutralize acids or certain chemicals to prevent corrosion of the metal. By way of illustration, mention may, for example, be made of dimercaptothiadiazole (DMTD), benzotriazoles, phosphites (capture of free sulfur). V Polymers improving the viscosity index: These additives make it possible to guarantee good resistance to cold and a minimum viscosity at high temperature of the composition. By way of illustration, mention may, for example, be made of polymeric esters, copolymer olefins (OCP), and and alkyl polymethacrylates (PMA). V Pour point improvers: These additives improve the cold behavior of the compositions, slowing down the formation of paraffin crystals. These are, for example, alkyl polymethacrylates, polyacrylates, polyarylamides, polyalkylphenols, polyalkylnaphthalenes and alkylated polystyrenes. V Defoamers: These additives counteract the effect of detergents. By way of illustration, mention may be made of polymethylsiloxanes and polyacrylates. V Thickeners: Thickeners are additives used especially for industrial lubrication and make it possible to formulate lubricants of higher viscosity than lubricant compositions for engines. By way of illustration, mention may be made of polysiobutenes having a molar mass by weight of 10,000 to 100,000 g / mol. V Dispersants: These additives ensure the suspension and removal of insoluble solid contaminants constituted by the secondary oxidation products which form during the use of the composition. By way of illustration, mention may be made, for example, of succinimides, PIBs (polyisobutene) succinimides and Mannich bases. V The friction modifiers; These additives improve the friction coefficient of the composition. As ICG70112 FR deposit of illustrative text, mention may be made of molybdenum dithiocarbamate, amines having at least one hydrocarbon chain of at least 16 carbon atoms, esters of fatty acids and of polyols such as esters of fatty acids and of glycerol, in particular glycerol monooleate. V Process for the preparation of the lubricant compositions of the invention The lubricant compositions of the invention are prepared by means well known to those skilled in the art. For example, it is sufficient for a person skilled in the art in particular to: withdrawing a desired quantity of a solution comprising the polydiol Al random copolymer as defined above, in particular that resulting from the copolymerization of at least one monomer of formula (I) with at least one monomer of formula (II-A) and at least one monomer of formula (II-B); take a desired quantity of a solution comprising the random copolymer A2 poly (boronic ester) as defined above; take a desired amount of a solution comprising the exogenous compound 20 A5 as defined above, mix either simultaneously or sequentially the solutions taken from a lubricating base oil, to obtain the lubricating composition of the invention. The order of adding the compounds has no influence in the implementation of the process for preparing the lubricating composition. V Properties of the lubricant compositions according to the invention The lubricant compositions of the invention result from the mixture of associative polymers which have the property of increasing the viscosity of the lubricating oil by combinations. The lubricant compositions according to the invention have the advantage that these associations or crosslinking are thermoreversible and possibly that the rate of association or crosslinking can be controlled by the addition of an additional boron ester compound A5. A person skilled in the art knows how to adjust the different parameters of the various constituents of the composition to obtain a lubricating composition whose viscosity increases when the temperature increases and to modulate its viscosity and its rheological behavior. ICG70112 FR text deposit The amount of boronic ester linkages (or boronic ester link) which can be established between the random polydiol Al copolymers and the compounds A2, in particular the random boronic ester copolymer A2, is adjusted by a person skilled in the art by means of an appropriate selection. polydiol Al random copolymer, compound A2, in particular boronic ester random copolymer A2, exogenous compound A5, and in particular molar percentage of exogenous compound A5. In addition, a person skilled in the art knows how to select the structure of compound A2, in particular of the random boronic ester copolymer, as a function of the structure of the random copolymer Al. Preferably, when in the random copolymer Al, comprising at least one Ml monomer in which y = l, then the compound A2 of general formula (III) or the copolymer A2 comprising at least one monomer M4 of formula (IV) will preferably be chosen with wi = 1, w 2 = l and t = l, respectively. Furthermore, the skilled person can adjust in particular: the molar percentage of monomer M1 carrying diol functions in the random copolymer polydiol Al; the molar percentage of monomer M3 of formula (X) in the polydiol Al random copolymer, in particular the molar percentage of styrene; the molar percentage of monomer M4 bearing boronic ester functions in the random boronic ester copolymer A2, the average length of the side chains of the random copolymer polydiol Al; the average length of the side chains of the random boronic ester copolymer A2, the length of the monomer M4 of the random boronic ester copolymer A2, the average degree of polymerization of the random polydiol Al copolymers, and of the random boronic ester copolymers A2, the mass percentage of the random polydiol Al copolymer, - the percentage by mass of the random boronic ester copolymer A2, the molar percentage of exogenous compound A5 relative to the diol functions of the random copolymer Al polydiols, Advantageously, the content of random copolymer Al in the lubricating composition ranges from 0.25% to 20% by weight relative to the total weight of the composition ICG70112 FR lubricant text deposit, preferably from 1% to 10% by weight relative to the total weight of the lubricant composition. Advantageously, the content of compound A2, in particular the content of random copolymer of boronic ester, ranges from 0.25% to 20% by weight relative to the total weight of the lubricating composition, preferably preferably from 0.5 to 10% by weight. weight relative to the total weight of the lubricating composition. Preferably, the mass ratio (A1 / A2 ratio) between the polydiol Al statistical compound and the A2 compound, in particular the boronic ester random copolymer, ranges from 0.001 to 100, preferably from 0.05 to 20, even more preferably from 0.1 to 10, more preferably 0.2 to 5. In one embodiment, the sum of the masses of the random copolymer Al and of the compound A2, in particular of the random copolymer of boronic ester, ranges from 0.5 to 20% relative to the total mass of the lubricating composition, preferably 4% to 15% relative to the total mass of the lubricating composition and the mass of lubricating oil ranges from 60% to 99% relative to the total mass of the lubricating composition. For engine applications, advantageously, the sum of the masses of the random copolymer Al and of the compound A2 represents from 0.1 to 15%, relative to the total mass of the lubricating composition. For transmission applications, advantageously, the sum of the masses of the random copolymer Al and of the compound A2 represents from 0.5 to 50%, relative to the total mass of the lubricating composition. In one embodiment, the molar percentage of exogenous compound A5 in the lubricating composition ranges from 0.05% to 5000%, preferably ranges from 0.1% to 1000%, more preferably from 0.5% to 500 %, even more preferably from 1% to 150% relative to the diol functions of the random copolymer Al. In one embodiment, the lubricant composition of the invention results from the mixture of: - 0.5% to 20% by weight of at least one polydiol Al random copolymer as defined above, relative to the total weight of the lubricating composition; - 0.5% to 20% by weight of at least at least one compound A2 as defined above, in particular as a random copolymer of boronic ester; relative to the total weight of the lubricating composition; and - 0.001% to 0.5% by weight of at least one exogenous compound A5 as defined above, relative to the total weight of the ICG70112 FR text deposit lubricant composition, and - 60% to 99% by weight of at least one lubricating oil as defined above, relative to the total weight of the lubricating composition. In another embodiment, the lubricant composition of the invention results from the mixture of: - 0.5% to 20% by weight of at least one polydiol Al random copolymer as defined above, relative to the total weight of the lubricating composition; - 0.5% to 20% by weight of at least at least one compound A2 as defined above, in particular as a random copolymer of boronic ester; relative to the total weight of the lubricating composition; and - optionally 0.001% to 0.5% by weight of at least one exogenous compound A5 as defined above, relative to the total weight of the lubricating composition, and - 0.5% to 15% by weight of at least one functional additive as defined above, relative to the total weight of the lubricating composition, and - 60% to 99% by weight of at least one lubricating oil as defined above, relative to the total weight of the lubricating composition. > Method for modulating the viscosity of a lubricating composition Another object of the present invention is a method for modulating the viscosity of a lubricating composition, the method comprising at least: providing a lubricant composition resulting from the mixture of at least one lubricating oil, at least one polydiol Al random copolymer and at least one A2 random copolymer comprising at least two boronic ester functions and which can be combined with said random polydiol Al copolymer by at least one transesterification reaction, the addition to said lubricating composition of at least one exogenous compound A5 chosen from boronic diesters of formula (XI). By "modulating the viscosity of a lubricating composition" is meant within the meaning of the present invention, an adaptation of the viscosity at a given temperature in ICG70112 FR text deposit depending on the use of the lubricating composition. This is obtained by adding an exogenous compound A5 as defined above. This compound makes it possible to control the rate of association and crosslinking of the two copolymers polydiol Al and poly (boronic ester) A2. Other objects according to the invention Another object of the present invention is the use of the lubricating composition as defined above for lubricating a mechanical part. In the following description, the percentages are expressed by weight relative to the total weight of the lubricating composition. The compositions of the invention can be used to lubricate the surfaces of parts that are conventionally found in an engine such as the piston system, segments, liners. Another object of the present invention is therefore a composition for lubricating at least one engine, said composition comprising, in particular essentially consists of, a composition resulting from the mixture of: 85% to 99.98% by weight, advantageously 92 to 99% by weight of a lubricating oil, and 0.1% to 15% by weight, advantageously from 1 to 8% by weight of a mixture of at least one random copolymer A1 as defined above, and at least one random copolymer of boronic ester A2 as defined above ; and 0.001% to 0.1% by weight at least one exogenous compound A5 as defined above; the composition having a kinematic viscosity at 100 ° C. measured according to the ASTM D445 standard ranging from 3.8 to 26.1 cSt; the weight percentages being expressed relative to the total weight of said composition. In a composition for lubricating at least one engine as defined above, the random copolymers Al, and the random copolymers boronic ester A2 as defined above can associate and exchange in a thermoreversible manner, in the presence of the exogenous compound A5; but they do not form three-dimensional networks. They are not cross-linked. In one embodiment, the composition for lubricating at least one engine further comprises at least one functional additive chosen from the group formed by detergents, anti-wear additives, extreme pressure additives, additional antioxidants, anti-corrosion additives, polymers improving the viscosity index, pour point improvers, defoamers, thickeners, ICG70112 FR filing text dispersants, friction modifiers and their mixtures. In one embodiment of the invention, the composition for lubricating at least one engine, said composition comprising, in particular essentially consists of a composition resulting from the mixture of: - 80% to 99% by weight of a lubricating oil, and 0.1% to 15% by weight of a mixture of at least one random copolymer Al as defined above, at least one random copolymer of boronic ester A2 as defined above; and 0.001% to 0.1% by weight at least one exogenous compound A5 as defined above; 0.5 to 15% by weight of at least one functional additive chosen from the group formed by detergents, anti-wear additives, extreme pressure additives, additional antioxidants, anti-corrosion additives, polymers improving the index of viscosity, pour point improvers, defoamers, thickeners, dispersants, friction modifiers and mixtures thereof; the composition having a kinematic viscosity at 100 ° C. measured according to the ASTM D445 standard ranging from 3.8 to 26.1 cSt; the weight percentages being expressed relative to the total weight of said composition. The definitions and preferences relating to lubricating oils, random copolymers A1, random copolymer boronic ester A2 and exogenous compound A5 also apply to compositions for lubricating at least one engine. Another object of the present invention is a composition for lubricating at least one transmission, such as manual or automatic gearboxes. Another object of the present invention is therefore a composition for lubricating at least one transmission, said composition comprising, in particular essentially consists of a composition resulting from the mixture of: - 50% to 99.4% by weight of a lubricating oil, and 0.5% to 15% by weight of a mixture of at least one random copolymer Al as defined above, and at least one random copolymer of boronic ester A2 as defined above; and 0.001% to 0.5% by weight at least one exogenous compound A5 as defined above; the composition having a kinematic viscosity at 100 ° C. measured according to standard ASTM D445 ranging from 4.1 to 41 cSt, the percentages by weight being expressed by ICG70112 FR text deposit report to the total weight of said composition. In a composition for lubricating at least one transmission as defined above, the random copolymers A1, and the random copolymers boronic ester A2 as defined above can combine and exchange in a thermoreversible manner, in the presence of the exogenous compound A5 ; but they do not form three-dimensional networks. They are not cross-linked. In one embodiment, the composition for lubricating at least one transmission further comprises at least one functional additive chosen from the group formed by detergents, anti-wear additives, extreme pressure additives, additional antioxidants, anti-corrosion additives, polymers improving the viscosity index, pour point improvers, defoamers, thickeners, dispersants, friction modifiers and mixtures thereof. In one embodiment of the invention, the composition for lubricating at least one transmission comprises, in particular essentially consists of, a composition resulting from the mixture of: 45% to 99.39% by weight of a lubricating oil, and 0.5% to 50% by weight of a mixture of at least one random copolymer Al as defined above, and at least one random copolymer of boronic ester A2 as defined above; and - 0.001% to 0.5% by weight at least one exogenous compound A5 as defined above; 0.1% to 15% by weight of at least one functional additive chosen from the group formed by detergents, anti-wear additives, extreme pressure additives, additional antioxidants, anti-corrosion additives, polymers improving the index viscosity, pour point improvers, defoamers, thickeners, dispersants, friction modifiers and mixtures thereof; the composition having a kinematic viscosity at 100 ° C. measured according to standard ASTM D445 ranging from 4.1 to 41 cSt, the percentages by weight being expressed relative to the total weight of said composition. The definitions and preferences relating to lubricating oils, to random copolymers A1 to random copolymer to boronic ester A2 and to exogenous compound A5 also apply to compositions for lubricating at least one transmission. The compositions of the invention can be used for the engines or transmissions of light vehicles, heavy vehicles but also of ships. Another object of the present invention is a method of lubricating water ICG70112 FR text deposit at least one mechanical part, in particular at least one engine or at least one transmission, said method comprising a step in which said mechanical part is brought into contact with at least one lubricating composition as defined above. Definitions and preferences relating to lubricating oils, to random copolymers A1, in particular that resulting from the copolymerization of at least one monomer of formula (I) with at least one monomer of formula (Π-A), at least one monomer of formula (II-B) and optionally a monomer M3 of formula (X), to the random copolymer boronic ester A2 and, where appropriate, to the exogenous compound A5 also apply to the method of lubrication of at least one mechanical part. Figures FIG. 1 schematically represents a random copolymer (P1), a gradient copolymer (P2) and a block copolymer (P3), each round represents a monomer unit. The difference in chemical structure between the monomers is symbolized by a different color (light gray / black). FIG. 2 schematically represents a comb copolymer. FIG. 3 schematically illustrates the exchange reactions of boronic ester links between two random polydiol polymers (Al-1 and Al-2) and two random boronic ester polymers (A2-1 and A2-2) in the presence of diols . FIG. 4 illustrates and schematically represents the crosslinking of the composition according to the invention in tetrahydrofuran (THF). FIG. 5 schematically represents the behavior of the composition of the invention as a function of the temperature. A random copolymer (2) having diol functions (function A) can be combined in a thermoreversible manner with a random copolymer (1) having boronic ester functions (function B) via a transesterification reaction. The organic group of boronic ester functions (function B) which is exchanged during the transesterification reaction is a diol symbolized by a black crescent. A chemical bond (3) of the boronic ester type is formed with the release of a diol compound. Figure 6 represents the evolution of the relative viscosity (without unit, the ordinate axis) as a function of the temperature (° C, the abscissa axis) of compositions B and C. FIG. 7 represents the evolution of the relative viscosity (without unit, the ordinate axis) as a function of the temperature (° C, the abscissa axis) of compositions A, E, F and G. ICG70112 FR text deposit Experimental part : The following examples illustrate the invention without limiting it. 1. Synthesis of random copolymers Al carrying a diol function o 1.1: From a monomer carrying a diol function In one embodiment, the random copolymer Al of the invention is obtained according to the following reaction scheme 11: MteMte! eiftasaJata-eo-eslasJv- ”alWÉsl“ ^ losatel v * 2 ! S. EltoiinatloBàBbentdedKiÎiieRAFT ♦ SaBftlwères I “Bh a e” ÎSJe- “ o ItaWlel vi amineiy” The copolymer obtained after elimination of the RAFT chain end contains, inter alia, styrene as a comonomer and the thiocarbonylthio residue has been eliminated, for example by converting it into a thioether. 1.1.1 Synthesis of the monomer Ml carrying a diol function The synthesis of a methacrylate monomer carrying a diol function is carried out in three stages (steps 1, 2 and 3 of reaction scheme 11) according to the protocol below: 1st stage: ICG70112 FR text deposit 42.1 g (314 mmol) of 1,2,6-hexane triol (1,2,6-HexTri) are introduced into an IL flask. 5.88 g of molecular sieve (4 ° A) are added followed by 570 ml of acetone. 5.01 g (26.3 mmol) of para-toluene sulfonic acid (pTSA) are then slowly added. The reaction medium is left under stirring for 24 hours at room temperature. 4.48 g (53.3 mmol) of NaHCCF are then added. The reaction medium is left under stirring for 3 hours at room temperature before being filtered. The filtrate is then concentrated in vacuo using a rotary evaporator until a suspension of white crystals is obtained. 500 ml of water are then added to this suspension. The solution thus obtained is extracted with 4 χ 300 mL of dichloromethane. The organic phases are combined and dried over MgSCL. The solvent is then completely evaporated in vacuo at 25 ° C by means of a rotary evaporator. 2 nd step: 5.01 g (28.8 mmol) of the product thus obtained is then introduced into an IL flask. 4.13 g (31.9 mmol) of DIPEA and 37.9 mg (0.31 mmol) of DMAP are then introduced into the flask followed by 5.34 g (34.6 mmol) of methacrylic anhydride. The flask is then placed under stirring at room temperature for 24 hours. 0.95 g of methanol (29.7 mmol) are then added to the solution and the flask was left under stirring for an additional hour. The product is then dissolved in 40 mL of hexane. The organic phase is then successively washed with 25 mL of water, 3 χ 25 mL of a 0.5 M aqueous hydrochloric acid solution, 3 x 25 mL of a 0.5 M aqueous NaOH solution and again with 25 mL of water. The organic phase is dried over MgSC> 4, filtered and then concentrated under vacuum using a rotary evaporator to give a light yellow liquid, the characteristics of which are as follows: 3 rd step: 17.23 g (71.2 mmol) of the product thus obtained is then introduced into an IL flask. 90 mL of water and 90 mL of acetonitrile are then introduced into the flask followed by 59.1 mL (159 mmol) of acetic acid. The flask is then stirred for 24 hours at 30 ° C, leaving a light flow of nitrogen oil to push the elimination of acetone. The solution thus obtained is extracted with 6 χ 30 mL of ethyl acetate. The organic phase is then successively washed with 5 χ 30 mL of a 0.5 M aqueous NaOH solution and then 3 χ 30 mL of water. The organic phase is then dried over MgSO4, filtered and then concentrated in vacuo using a rotary evaporator to give a light yellow liquid, the characteristics of which are as follows: 'H NMR (400 MHz, CDC13) δ: 6.02 (singlet, 1H), 5.49 (singlet, 1H), 4.08 (triplet, J = 6.4 Hz, 1H), 3.65-3 , 58 (multiplet, 1H), 3.57-3.50 (multiplet, 3H), 3.35 ICG70112 FR text repository (doublet of doublets, J = 7.6 Hz and J = 11.2 Hz, 1H), 1.86 (doublet of doublets, J = 1.2 Hz and J = 1.6 Hz, 3H) , 1.69-1.31 (multiplet, 6H). 1.1.2 Synthesis of methacrylate copolymers carrying diol functions 5 The synthesis of methacrylate copolymers carrying diol functions is carried out in two stages (steps 4 and 5 of reaction scheme 11): Copolymerization of two alkyl methacrylate monomers with a methacrylate monomer carrying a diol function and a styrene monomer; - Elimination of the end of the RAFT chain (aminolysis followed by Michael's addition of thiol on an alkyl acrylate). More specifically, the synthesis of the copolymer is carried out according to the following protocol: 1st stage: 12.56 g (37.1 mmol) stearyl methacrylate (StMA), 12.59 g (49.5 mmol) lauryl methacrylate (LMA), 2.57 g (24.7 mmol) styrene (Sty ), 2.54 g (12.4 mmol) of methacrylate carrying a diol function obtained according to the protocol described in paragraph 1.1.1, 82.5 mg (0.30 mmol) of cumyl dithiobenzoate, 15 mg (0 , 09 mmol) of azobisisobutyronitrile (AIBN) and 30 ml of anisole are introduced into a 250 ml Schlenk tube. The reaction medium is placed under stirring and degassed for 30 minutes by bubbling nitrogen before being brought to 65 ° C for a period of 24 hours. 2 nd step After 24 hours of polymerization, the Schlenk tube is placed in an ice bath to stop the polymerization, 30 ml of dimethyl formamide (DMF) and 0.4 ml of nbutylamine (4 mmol) are added to the solution without degassing the medium. Fifteen hours later, the polymer was completely discolored and 3 mL (21 mmol) of butyl acrylate are added. 16 hours later, the polymer is isolated by 3 successive precipitations in methanol, filtration and drying under vacuum at 50 ° C overnight. A copolymer is thus obtained having a number-average molar mass (Mo) of 53,000 g / mol, a polydispersity index (Ip) of 1.19 and a number-average degree of polymerization (DP n ) of 253. These values are respectively obtained by steric exclusion chromatography using tetrahydrofuran as eluent and a poly (methyl methacrylate) calibration and by monitoring the conversion into monomers during the copolymerization. ICG70112 FR text deposit A poly (alkyl methacrylate-co-alkyldiol methacrylateco-styrene) copolymer is obtained containing approximately 10 mol% of M1 diol monomer units. 2. Synthesis of the polyfalkyl methacrylate-co-monomer boronic ester copolymer) This synthesis is carried out according to the protocol described in application WO2016 / 113229 (experimental part §2.). 3. Synthesis of compound A5 The synthesis of compound A5 is carried out in one step following the protocol below: 5,000 g of phenylboronic acid (PBA) (41.0 mmol) are introduced into a 500 ml flask followed by 200 ml of THF. The reaction medium is then placed under stirring. 0.5 mL (28 mmol) of water is added dropwise until the phenylb oronic acid is completely dissolved. The reaction medium then becomes transparent and homogeneous. 8.286 g of 1,2-dodecanediol (1,2-DDD) (41.0 mmol) are then slowly added, followed by an excess of anhydrous magnesium sulfate in order to trap the water initially introduced as well as the water released. by condensation between PB A and 1,2-DDD. The reaction medium is left under stirring for 2 hours at 25 ° C before being filtered. The solvent is then removed from the filtrate using a rotary evaporator. The compound obtained is a mixture containing approximately 93 mol% of the boronic ester and 7 mol% of residual 1,2-dodecandiol. 'H NMR (400 MHz, CDC13) δ: 7.90 (multiplet, 2H), 7.60-7.40 (multiplet, 3H), 4.60 (multiplet, 1H), 4.46 (triplet, J = 9.2 Hz, 1H), 3.99 (doublet of doublets, J = 7.2 Hz and J = 8.8 Hz, 1H), 1.85-1.20 (multiplet, 18H), 0.96 (triplet, J = 6.8 Hz, 3.2H). 4. Rheological studies o 4.1 Ingredients for the formulation of compositions A to G Lubricating base oil The lubricating base oil used in the compositions to be tested is an oil of group III of the API classification, marketed by SK under the name Yubase 4. It has the following characteristics: Its kinematic viscosity at 40 ° C measured according to standard ASTM D445 is 19.57 cSt; ICG70112 FR text deposit Its kinematic viscosity measured at 100 ° C according to standard ASTM D445 is 4.23 cSt; Its viscosity index measured according to standard ASTM D2270 is 122; Its Noack volatility in weight percent, measured according to DIN 51581 is 14.5; Are flash point (flash point in English) in degree Celsius measured according to standard ASTM D92 is 230 ° C; Its pour point (for point in English) in degrees Celsius measured according to ASTM D97 is -15 ° C. - Polydiol A-l random copolymer This copolymer comprises 10 mol% of monomers having diol functions and 25 mol% of styrene monomers. The average side chain length is 13.5 carbon atoms. Its number-average molar mass is 50,500 g / mol. Its polydispersity index is 1.26. Its number average polymerization degree (DPn) is 240. The number average molar mass and the polydispersity index are measured by size exclusion chromatography using poly (methyl methacrylate) calibration. This copolymer is obtained by according to the implementation of the protocol described in paragraph 1 above. - Random copolymer A-2 boronic ester: This copolymer comprises 5 mol% of monomers having boronic ester functions. The average length of side chains is 12 carbon atoms. Its number-average molar mass is 39,000 g / mol. Its polydispersity index is 1.41. Its number average polymerization degree (DPn) is 192. Its number average molar mass and the polydispersity index are measured by size exclusion chromatography using poly (methyl methacrylate) calibration. This copolymer is obtained by implementing the protocol described in paragraph 2 above. - Compound A5: This compound consists of 93 mol% of boronic Tester formed by the esterification of phenylb oronic acid and of 1,2-dodecanediol and at 7 mol% of an excess of 1,2-dodecandiol. This compound is obtained by implementing the protocol described in paragraph 3 above. 4.2 Formulation of compositions for the study of viscosity ICG70112 FR text deposit Composition A (comparative) is obtained in the following manner: It contains a solution at 4.2% by mass of a polymethacrylate polymer in a lubricating base oil of group III of the API classification. The polymer has a number average molar mass (Mn) equal to 106,000 g / mol, a polydispersity index (Ip) equal to 3.06, a number average polymerization degree of 466 and the average length of the pendant chains is of 14 carbon atoms. This polymethacrylate is used as an additive improving the viscosity index. 4.95 g of a formulation having a mass concentration of 42% of this polymethacrylate in a group III base oil and 44.6 g of group base oil III are introduced into a bottle. The solution thus obtained is kept under stirring at 90 ° C. until the polymethacrylate is completely dissolved. A 4.2% by mass solution of this polymethacrylate is obtained. This composition is used as a reference for the study of viscosity. It represents the rheological behavior of the lubricating compositions sold. Composition B (comparative) is obtained in the following manner: 6.52 g of polydiol A-1 copolymer and 58.68 g of a group III base oil are introduced into a bottle. The solution thus obtained is kept under stirring at ambient temperature until complete dissolution of the polydiol A-1. A 10% by mass solution of polydiol A-1 copolymer is obtained. 4.2 g of this solution of polydiol A-1 at 10% by mass in group III base oil are mixed with 2.8 g of this same base oil. The solution thus obtained is kept stirring at room temperature for 5 minutes. A 6% by mass solution of polydiol copolymer A-1 is obtained. Composition C (comparative) is obtained in the following manner: 7.33 g of poly-boronic ester copolymer A-2 and 65.97 g of a group III base oil are introduced into a bottle. The solution thus obtained is kept under stirring at ambient temperature until complete dissolution of the boronic poly ester. A-2. A 10% by mass solution of poly (boronic ester copolymer A2) is obtained. 4.2 g of this solution of 10% by weight boronic poly ester A-2 in group III base oil are mixed with 2.8 g of this same base oil. The solution thus obtained is kept stirring at room temperature for 5 minutes. A 6% by weight solution of boronic poly ester copolymer A-2 is obtained. ICG70112 FR text deposit Composition D is obtained in the following manner: 1.65 g of compound A-5 and 14.85 g of a group III base oil are introduced into a bottle. The solution thus obtained is kept under stirring at ambient temperature until complete dissolution of the compound A-5. We get a solution to 10% by mass of compound A-5. Composition E (comparative) is obtained in the following manner: 2.80 g of the 10% by mass solution of polydiol A-l prepared previously and 1.40 g of Group III base oil are introduced into a bottle. 2.80 g of the 10% by mass solution of boronic poly ester A-2 prepared previously are added to this solution. The solution thus obtained is kept stirring at room temperature for 5 minutes. A 4% by mass solution of polydiol copolymer A-1 and 4% by mass of poly (boronic ester) copolymer A-2 is obtained. Composition F (according to the invention) is obtained in the following manner: 2.80 g of the 10% by mass solution of polydiol A-l prepared previously and 1.26 g of group III base oil are introduced into a bottle. 2.80 g of the 10% by mass solution of poly boronic ester A-2 prepared previously and 0.14 g of composition D prepared previously are added to this solution. The solution thus obtained is kept stirring at room temperature for 5 minutes. A 4% by mass solution of polydiol copolymer A-1.4 is obtained, 4% by mass of poly (boronic ester) copolymer A-2 and 48.6 pmol of compound A-5. The solution therefore comprises 43 mol% of compound A-5 relative to the diol functions of polydiol A-1 and 93 mol% of compound A-5 relative to the EB functions of the poly (boronic ester) A-2. Composition G (according to the invention) is obtained in the following manner: 2.80 g of the 10% by mass solution of polydiol A-l prepared previously and 1.12 g of Group III base oil are introduced into a bottle. 2.80 g of the 10% by weight solution of boronic poly ester A-2 prepared above and 0.28 g of composition D prepared above are added to this solution. The solution thus obtained is kept stirring at room temperature for 5 minutes. A 4% by mass solution of polydiol copolymer A-1.4 is obtained, 4% by mass of poly (boronic ester) copolymer A-2 and 97.2 pmol of compound A-5. The solution therefore comprises 86 mol% of compound A-5 relative to the diol functions of polydiol A-1 and 186 mol% of compound A-5 relative to the EB functions of the poly (boronic ester) A-2. ICG70112 EN text deposit o 4.4 Apparatus and protocols for viscosity measurement The rheological studies were carried out using a Couette rheometer MCR 501 with controlled constraint from Anton Paar. In the case of polymer formulations which do not form gels in a group III base oil over the temperature range of the study (compositions A to G), the rheology measurements were carried out using a cylindrical geometry of reference DG 26.7 The viscosity was measured as a function of the shear rate for a temperature range varying from 10 ° C to 110 ° C. For each temperature, the viscosity of the system was measured as a function of the shear rate from 1 to 100 s' 1 . The viscosity measurements as a function of the shear rate at T = 10 ° C, 50 ° C, 70 ° C and 110 ° C were carried out (going from 10 ° C to 110 ° C). An average viscosity was then calculated for each temperature using the measurement points located on the same plate. The relative viscosity calculated according to the following formula (^ relative ^ solution The base oil was chosen to represent the evolution of the viscosity of the system as a function of temperature, because this quantity directly reflects the compensation for the loss of natural viscosity of a group III base oil of the polymer systems studied. o 4.5 Results obtained in rheology The viscosity of compositions A to F was studied over a temperature range from 10 ° C to 110 ° C. The relative viscosity of these compositions is illustrated in FIGS. 6 and 7. The polydiol Al random copolymer, alone in composition B, does not allow significant compensation for the loss of natural viscosity of the group III base oil (FIG. 6 ). It is the same for the poly (boronic ester) copolymer A-2 when this copolymer is used alone in composition C (Figure 6) · When the random polydiol copolymer Al and the poly (boronic ester) copolymer A-2 are present together in the same lubricating composition (composition E), compensation is observed for the loss of natural viscosity of the group III base oil more important than that which results from the addition of the ICG70112 FR text deposit of polymethacylate polymer in group III base oil (composition A) (Figure OLWhen the composition (composition F) additionally comprises 43 mol% of compound A-5 free relative to the diol functions of the polydiol copolymer Al; there is a slight decrease in the relative viscosity at low temperatures as well as a slight decrease in the compensation for the loss of viscosity when hot compared with that of composition E which comprises the random copolymer polydiol Al and the poly (boronic ester copolymer) ) A-2) (Figure 7). Composition F also makes it possible to obtain better compensation for the loss of viscosity of the oil when hot than composition A, while giving a lower viscosity than this same composition A from 10 ° C. to 70 ° C. When the composition (composition G) also comprises 86 mol% of compound A-5 free relative to the diol functions of the polydiol copolymer A-1; there is a greater decrease in the relative viscosity at low temperatures as well as a decrease in the compensation for the loss of viscosity when hot compared with that of composition E which comprises the random polydiol copolymer Al and the poly (boronic ester copolymer) ) A-2) (Figure 7). Compositions F and G always retain the property of compensating for the loss of viscosity of the Group III base oil at high temperatures. Compound A-5 therefore makes it possible to modify, as a function of temperature, the viscosity of a lubricating composition resulting from the mixture of at least one random copolymer polydiol Al and at least one random copolymer A-2 poly (boronic ester) by controlling the rate of association of the chains of these two copolymers. ICG70112 FR text deposit
权利要求:
Claims (6) [1" id="c-fr-0001] 1. Composition resulting from the mixture of at least: - a random polydiol Al copolymer, 5 - a compound A2 comprising at least two boronic ester functions, - an exogenous compound A5 chosen from those corresponding to formula (XI): 15 (XI) in which: Q represents a group chosen from a hydrocarbon group comprising from 1 to 30 carbon atoms, optionally substituted by one or more groups chosen from: a hydroxyl, an -OJ group, 20 -C (O) -O-J with J a hydrocarbon group comprising from 1 to 24 carbon atoms, - G4, G5, identical or different, represent groups chosen from a hydrogen atom, a hydrocarbon chain comprising from 1 to 24 carbon atoms, a hydroxyl, a group -OJ, -C (O) -OJ with J a group 25 hydrocarbon comprising from 1 to 24 carbon atoms, - g represents 0 or 1. [2" id="c-fr-0002] 2. Composition according to claim 1 in which the exogenous compound A5 is chosen from those corresponding to the formula (XIA): in which : (XIA) ICG70112 FR text deposit - Gi, G2, G 3 , G4, G5, identical or different, represent groups chosen from a hydrogen atom, a hydrocarbon chain comprising from 1 to 24 carbon atoms, a hydroxyl, a group -OJ, -C ( O) -OJ with J a hydrocarbon group 5 comprising from 1 to 24 carbon atoms, - g represents 0 or 1. [3" id="c-fr-0003] 3. Composition according to claim 1 or according to claim 2, in which the molar percentage of exogenous compound A5 relative to the diol functions 10 of the random copolymer A1 ranges from 0.025 to 5000%, preferably ranges from 0.1% to 1000%, even more preferably from 0.5% to 500%, even more preferably from 1% to 150%. [4" id="c-fr-0004] 4. Composition according to claim 2 or according to claim 3, in which The exogenous compound A5 is chosen from those corresponding to the formula (XI B): (XI B) 5. Composition according to claim 4, in which the exogenous compound A5 is chosen from those corresponding to the formula (XI B) with g = 0, G 4 = H and G5 represents a C1-C24 alkyl. 6. Composition according to any one of the preceding claims, in which the random copolymer Al results from the copolymerization: at least one first monomer Ml of general formula (I): ICG70112 FR text deposit X., 0 (I) in which: - Ri is chosen from the group formed by -H, -CH 3 and -CH 2 -CH 3 ; - x is an integer ranging from 1 to 18, preferably from 2 to 18; - y is an integer equal to 0 or 1; - Xi and X 2 , identical or different, are chosen from the group formed by hydrogen, tetrahydropyranyl, methyloxymethyl, terbutyl, benzyl, trimethylsilyl and t-butyl dimethylsilyl; or - Xi and X 2 form with the oxygen atoms a bridge of the following formula * ·, R9 R's in which: - the stars (*) symbolize the bonds to oxygen atoms, - R ' 2 and R ” 2 , identical or different, are chosen from the group formed by hydrogen and a C1-Cn alkyl, preferably methyl; or - Xi and X 2 form with the oxygen atoms a boronic ester of the following formula: D „, .K 2 * - B * in which : - the stars (*) symbolize the bonds to oxygen atoms, - R '” 2 is chosen from the group formed by a C6-C 3 o aryl, a C7-C 3 o aralkyl and a C 2 -C 3 o alkyl, preferably a G, Ci 8 aryl; with at least one second M2 monomer of general formula (II): ICG70112 FR text deposit H 2 C: r 2 r 3 (Π) in which: - R 2 is chosen from the group formed by -H, -CH 3 and -CH 2 -CH 3 , - R 3 is chosen from the group formed by a C6-Cis aryl, an aryl Cô-Cis substituted by a group R ' 3 , -C (O) -O-R' 3 , -O-R ' 3 , -S-R' 3 and -C (O) -N (H) -R ' 3 with R' 3 an alkyl group in Ci-C 30 . 7. Composition according to claim 6, in which the random copolymer Al results from the copolymerization: at least a first monomer Ml of general formula (I), with at least a second monomer M2 of general formula (II): r 3 (Π) in which: - R2 is chosen from the group formed by -H, -CH 3 and -CH 2 -CH 3 , R 3 is chosen from the group formed by -C (O) -O-R ' 3 , -O-R' 3 , —S— R '3 and -C (O) -N (H) -R' 3 with R '3 alkyl, Ci-C 30, and with at least one third monomer M3 of the formula (X): (X) 35 in which: - Zi, Z 2 , Z 3 , identical or different, represent groups chosen from a hydrogen atom, a C1-C12 alkyl, a group ICG70112 FR text deposit -OZ ’, —C (O) —O — Z’ with Z ’C1-C12 alkyl. 8. Composition according to claim 7, in which the third monomer M3 is styrene. 9. Composition according to either of Claims 7 and 8, in which the random copolymer Al results from the copolymerization of at least one monomer M1 with at least two monomers M2 having different R3 groups and at least one monomer M3. 10. Composition according to claim 9, in which the two monomers M2 of the random copolymer Al have the general formula (Π-B): R, (II-B) in which: R2 is chosen from the group formed by -H, -CH 3 and-CFF-CFF R '”3 is a C9-C30 alkyl group · 11. Composition according to any one of the preceding claims, in which the side chains of the random copolymer Al have a length 25 averaging from 8 to 20 carbon atoms, preferably 9 to 18 carbon atoms. 12. Composition according to any one of claims 7 to 9, in which the random copolymer Al has a molar percentage of monomer M3 of Formula (X) in said copolymer ranging from 2 to 50%, preferably from 3 to 40%, more preferably ranging from 5 to 35%. 13. Composition according to any one of claims 6 to 12, in which the random copolymer Al has a molar percentage of monomer Ml of formula (I) in said copolymer ranging from 1 to 30%, preferably from 5 to 25%. ICG70112 FR text deposit 14. Composition according to any one of the preceding claims, in which the random copolymer Al has a number-average degree of polymerization ranging from 40 to 2000, preferably from 40 to 1000. [5" id="c-fr-0005] 15. Composition according to any one of the preceding claims, in which the random copolymer Al has a polydispersity index (Ip) ranging from 1.05 to 4.0; preferably ranging from 1.10 to 3.8. 16. Composition according to any one of the preceding claims [6" id="c-fr-0006] In which the compound A2 is a compound of formula (III): R 4 R / (' O B — O / B — L R 5 (ni) in which: - wi and w 2 , identical or different are whole numbers chosen between 0 and 1; - R4, R5, Re and R7, identical or different, are chosen from the group formed by hydrogen and a hydrocarbon group comprising from 1 to 30 carbon atoms, optionally substituted by one or more groups chosen from: a hydroxyl, a group -OJ, -C (O) -OJ with J a hydrocarbon group comprising from 1 to 24 carbon atoms; - L is a divalent linking group and chosen from the group formed by a Cô-Cis aryl, a C--Cis aralkyl and a C2-C24 hydrocarbon chain. 17. Composition according to any one of claims 1 to 15 in which the compound A2 is a random copolymer resulting from the copolymerization of at least one M4 monomer of formula (IV): ICG70112 FR text deposit Rio <4 / b_m / -0 X-fR ^ R 11 // ^ R9 H 2 C (IV) in which: t is an integer equal to 0 or 1; u is an integer equal to 0 or 1; M and Rg are divalent linking groups, identical or different, chosen from the group formed by a Cô-Cig aryl, a C7-C24 aralkyl and a C2-C24 alkyl, preferably a Cô-Cig aryl, X is a function chosen from the group formed by -OC (O) -, C (O) -O-, -C (O) -N (H) -, -N (H) -C (O) -, - S-, -N (H) -, -N (R ' 4 ) - and -O- with R'4 a hydrocarbon chain comprising from 1 to 15 carbon atoms; R9 is chosen from the group formed by -H, -CH 3 and -CH 2 -CH3; Rio and Ru, which are identical or different, are chosen from the group formed by hydrogen and a hydrocarbon group having from 1 to 30 carbon atoms, optionally substituted by one or more groups chosen from: a hydroxyl, a group -OJ, -C ( O) -OJ with J a hydrocarbon group comprising from 1 to 24 carbon atoms; with at least one second monomer M5 of general formula (V): , R 12 h 2 c ^ Ç R 13 (V) in which: - R12 is chosen from the group formed by -H, -CH 3 and -CH 2 -CH3, - R13 is chosen from the group formed by a Cô-Cig aryl, a Cô-Cig aryl substituted by a group R'13, -C (O) -O-R'i 3; -O-R'13, -S-R'13 and -C (O) N (H) -R '13 with R'13 a C1-C30 alkyl group. 18. Composition according to claim 17, in which at least one of the following three conditions is met: 35 · either in formula (IV): u = 1, R9 is H and Rg represents a C6-Cig aryl or a C7-C24 aralkyl and the double bond of the M4 monomer of formula (IV) is directly connected to the group aryl; ICG70112 FR text deposit • either in formula (V): R12 represents H and R13 is chosen from the group formed by a Cô-Cig aryl and a Cô-Cig aryl substituted by a group R'13 with R'13 a C1-C25 alkyl group and the double bond of the monomer M5 of formula (V) is directly connected to the aryl group; Either the copolymer A2 comprises at least a third monomer M3 of formula (X) in which: - Zi, Z 2 , Z 3 , identical or different, represent, groups chosen from a hydrogen atom, a C1-C12 alkyl, a group -OZ ', —C (O) —O — Z' with Z 'C1-C12 alkyl. 19. The composition according to claim 17 or claim 18, in which the chain formed by the linking of the groups Rio, Μ, X and (Rx) ,, with u equal to 0 or 1 of the monomer of general formula (IV) has a total number of carbon atoms ranging from 8 to 38, preferably from 10 to 26. 20. Composition according to any one of claims 17 to 19, in which the side chains of the copolymer A2 have an average length greater than or equal to 8 carbon atoms, preferably ranging from 11 to 16 carbon atoms. 21. Composition according to any one of claims 17 to 20 in which the copolymer A2 has a molar percentage of monomer of formula (IV) in the said copolymer ranging from 0.25 to 20%, preferably from 1 to 25%. 22. Composition according to any one of claims 17 to 21, in Wherein the copolymer A2 has a number average degree of polymerization ranging from 50 to 1500, preferably from 50 to 800. ICG70112 FR text deposit 23. Composition according to any one of claims 17 to 22, in which the copolymer A2 has a polydispersity index (Ip) ranging from 1.04 to 3.54; preferably ranging from 1.10 to 3.10. 24. Composition according to any one of claims 17 to 23 in which the substituents Rio, Ru and the value of the index (t) of the monomer of formula (IV) of the random copolymer A2 are identical respectively to the substituents G4, G5 and at the value of the index (g), of the exogenous compound A5 of formula (XI). 25. Composition according to any one of claims 17 to 24 in which at least one of the substituents Rio, R11 or the value of the index (t) of the monomer of formula (IV) of the random copolymer A2 is different from the substituents respectively G4, G5 or the value of the index (g), of the exogenous compound A5 of formula (XI). 26. Composition according to any one of the preceding claims, in which the mass ratio between the copolymer Al and the compound A2 (ratio A1 / A2) ranges from 0.005 to 200, preferably from 0.05 to 20, even more preferably from 0.1 to 10. 27. Lubricating composition resulting from the mixture of at least: - a lubricating oil; and - a composition defined according to any one of claims 1 to 26. 1/5 • Ο · · t Ο -. ····· “·· * ··, .. '· —— SW®
类似技术:
公开号 | 公开日 | 专利标题 EP3099721B1|2019-03-06|Lubricating compositions comprising thermoassociative and exchangeable copolymers EP3245276B1|2021-09-08|Compositions of thermoassociative additives, the association of which is controlled, and lubricating compositions containing same FR3059006A1|2018-05-25|COMPOSITIONS OF THERMOASSOCIATIVE ADDITIVES WHERE THE ASSOCIATION IS CONTROLLED AND LUBRICATING COMPOSITIONS CONTAINING SAME EP3099722A1|2016-12-07|Thermoassociative and exchangeable copolymers, and compositions comprising same EP3545057A1|2019-10-02|Thermoassociative and exchangeable copolymers, composition comprising same FR3081465A1|2019-11-29|ASSOCIATIVE AND EXCHANGEABLE OLIGOMERS, COMPOSITION COMPRISING THE SAME FR3081466A1|2019-11-29|ASSOCIATIVE AND EXCHANGEABLE OLIGOMERS, COMPOSITION COMPRISING THE SAME EP3802753A1|2021-04-14|Associative and exchangeable oligomers, and composition containing same FR3081464A1|2019-11-29|ASSOCIATIVE AND EXCHANGEABLE OLIGOMERS, COMPOSITION COMPRISING SAME FR3078710A1|2019-09-13|COMPOSITION COMPRISING THERMOASSOCIATIVE AND EXCHANGEABLE COPOLYMERS FR3078706A1|2019-09-13|THERMOASSOCIATIVE AND EXCHANGEABLE COPOLYMERS, COMPOSITION COMPRISING SAME
同族专利:
公开号 | 公开日 US20190382679A1|2019-12-19| KR20190087544A|2019-07-24| RU2019115257A|2020-12-24| WO2018096253A1|2018-05-31| JP2019536887A|2019-12-19| CN110062802A|2019-07-26| MA46886A|2019-10-02| EP3545058A1|2019-10-02| CA3043798A1|2018-05-31| FR3059006B1|2020-06-12| ZA201903075B|2020-01-29| BR112019010370A2|2019-08-27|
引用文献:
公开号 | 申请日 | 公开日 | 申请人 | 专利标题 WO2016113229A1|2015-01-15|2016-07-21|Total Marketing Services|Compositions of thermoassociative additives, the association of which is controlled, and lubricating compositions containing same| FR2839723B1|2002-05-14|2004-07-23|Rhodia Chimie Sa|POLYMER OBTAINED BY CONTROLLED RADICAL POLYMERIZATION COMPRISING AT LEAST ONE BORONATE FUNCTION, ASSOCIATION WITH A LIGAND COMPOUND AND USES| FR3016885B1|2014-01-27|2017-08-18|Total Marketing Services|THERMOASSOCIATIVE AND EXCHANGEABLE COPOLYMERS, COMPOSITIONS COMPRISING THE SAME| FR3016887B1|2014-01-27|2016-02-05|Total Marketing Services|LUBRICATING COMPOSITIONS COMPRISING THERMOASSOCIATIVE AND EXCHANGEABLE COPOLYMERS|FR3081464B1|2018-05-24|2020-09-18|Total Marketing Services|ASSOCIATIVE AND EXCHANGEABLE OLIGOMERS, COMPOSITION INCLUDING THEM| FR3081467B1|2018-05-24|2020-07-10|Total Marketing Services|ASSOCIATIVE AND EXCHANGEABLE OLIGOMERS, COMPOSITION COMPRISING THE SAME| FR3081466B1|2018-05-24|2020-06-12|Total Marketing Services|ASSOCIATIVE AND EXCHANGEABLE OLIGOMERS, COMPOSITION COMPRISING THE SAME| FR3081465B1|2018-05-24|2020-06-12|Total Marketing Services|ASSOCIATIVE AND EXCHANGEABLE OLIGOMERS, COMPOSITION COMPRISING THE SAME|
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2017-10-19| PLFP| Fee payment|Year of fee payment: 2 | 2018-05-25| PLSC| Publication of the preliminary search report|Effective date: 20180525 | 2018-10-24| PLFP| Fee payment|Year of fee payment: 3 | 2019-10-22| PLFP| Fee payment|Year of fee payment: 4 | 2020-10-21| PLFP| Fee payment|Year of fee payment: 5 | 2021-11-22| PLFP| Fee payment|Year of fee payment: 6 |
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申请号 | 申请日 | 专利标题 FR1661403|2016-11-23| FR1661403A|FR3059006B1|2016-11-23|2016-11-23|THERMOASSOCIATIVE ADDITIVE COMPOSITIONS WHOSE ASSOCIATION IS CONTROLLED AND LUBRICATING COMPOSITIONS CONTAINING THEM|FR1661403A| FR3059006B1|2016-11-23|2016-11-23|THERMOASSOCIATIVE ADDITIVE COMPOSITIONS WHOSE ASSOCIATION IS CONTROLLED AND LUBRICATING COMPOSITIONS CONTAINING THEM| JP2019547788A| JP7008717B2|2016-11-23|2017-11-21|Thermally associative additive compositions with controlled associations, and lubricating compositions containing the compositions.| CA3043798A| CA3043798A1|2016-11-23|2017-11-21|Thermoassociative additive compositions, the association of which is controlled, and lubricating compositions containing same| RU2019115257A| RU2019115257A|2016-11-23|2017-11-21|COMPOSITIONS OF THERMO-ASSOCIATIVE ADDITIVES, THE ASSOCIATION OF WHICH IS CONTROLLED, AND CONTAINING THEIR LUBRICANT COMPOSITIONS| KR1020197018085A| KR20190087544A|2016-11-23|2017-11-21|Thermally bonded additive composition wherein the bonding is controlled, and a lubricating composition containing the same| CN201780072592.XA| CN110062802A|2016-11-23|2017-11-21|The heat association compositions of additives for associating controlled, and the lubricating composition containing it| PCT/FR2017/053189| WO2018096253A1|2016-11-23|2017-11-21|Thermoassociative additive compositions, the association of which is controlled, and lubricating compositions containing same| EP17812011.9A| EP3545058A1|2016-11-23|2017-11-21|Thermoassociative additive compositions, the association of which is controlled, and lubricating compositions containing same| MA046886A| MA46886A|2016-11-23|2017-11-21|COMPOSITIONS OF THERMOASSOCIATIVE ADDITIVES WHOSE ASSOCIATION IS CONTROLLED AND LUBRICATING COMPOSITIONS CONTAINING THEM| US16/463,547| US20190382679A1|2016-11-23|2017-11-21|Thermoassociative additive compositions, the association of which is controlled, and lubricating compositions containing same| BR112019010370A| BR112019010370A2|2016-11-23|2017-11-21|thermo-associative additive compositions whose association is controlled and lubricating compositions containing the same| ZA2019/03075A| ZA201903075B|2016-11-23|2019-05-16|Thermoassociative additive compositions, the association of which is controlled, and lubricating compositions containing same| 相关专利
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