 DOUBLE EMULSIONS COMPRISING A GELIFIED FAT PHASE
专利摘要:
The present invention relates to a water-in-oil-in-water emulsion, comprising an external continuous aqueous phase and a water-in-oil emulsion in the form of drops (G1), each drop (G1) comprising a continuous fatty phase and at least one drop (G2) comprising an internal aqueous phase, said continuous fat phase containing at least one gelling agent, said drops (G1) comprising a bark formed of at least one anionic polymer (PA1) and at least one cationic polymer (PC). 公开号:FR3057768A1 申请号:FR1660386 申请日:2016-10-26 公开日:2018-04-27 发明作者:Mathieu Goutayer；Yan Eric Pafumi；Amelie Pujol 申请人:Capsum SAS； IPC主号:
专利说明:
DOUBLE EMULSIONS COMPRISING A FROZEN FAT PHASE The present invention relates to double water-in-oil-in-water emulsions in which the fatty phase is gelled and in which the internal fatty and aqueous phases are in the form of drops. It also relates to their preparation process as well as their use in cosmetic compositions. Today, interest in the encapsulation of hydrophilic compounds continues to grow. Indeed, the encapsulation technologies concern a wide variety of industrial sectors such as medicine, pharmacy, food or cosmetics. Encapsulating a hydrophilic compound, such as a cosmetic active ingredient, consists of isolating it from the outside environment. This strategy is particularly necessary when this compound is incompatible with other elements of the aqueous phase. Several methods have been developed to best adapt to different applications such as spray-drying or the coacervation method. However, the development of new systems allowing the encapsulation of hydrophilic compounds in a satisfactory manner remains a constant objective. The present invention aims to provide a double emulsion, in particular macroscopic, allowing the encapsulation of hydrophilic compounds. More particularly, the present invention aims to provide a double emulsion, in particular macroscopic, with satisfactory encapsulation properties of hydrophilic compounds combined with a new visual and / or texture and particularly attractive to the consumer. Thus, the present invention relates to a water-in-oil-in-water emulsion, comprising an external continuous aqueous phase and, as dispersed phase, a water-in-oil emulsion in the form of drops (G1), each drop ( G1) comprising a continuous fatty phase and at least one, preferably a single, drop (G2) comprising an internal aqueous phase, said continuous fatty phase containing at least one gelling agent, said drops (G1) comprising a bark formed of at least at least one anionic polymer (PA1) and at least one cationic polymer (PC). Preferably, the aforementioned drops (G2) comprise a shell formed from at least one anionic polymer (PA2), identical or different from (PA1), and from at least one cationic polymer (PC). The invention therefore relates to double water-in-oil-in-water emulsions in which the fatty phase is gelled. Preferably, in an emulsion according to the invention, the drops (G1) and (G2) are macroscopic, that is to say visible to the naked eye. In the context of the present invention, the above-mentioned emulsions can also be designated by the term dispersions. The emulsions according to the invention include: - an internal aqueous phase, - an intermediate gelled fatty phase, and - an external aqueous phase. These emulsions comprise, in the external aqueous phase, drops (G1) of gelled fatty phase comprising a bark formed by coacervation, each drop (G1) of gelled fatty phase containing at least one drop (G2) of internal aqueous phase, this drop (G2) of internal aqueous phase optionally comprising a shell formed by coacervation. An emulsion according to the invention is particularly advantageous, on the one hand, in that it ensures a particularly satisfactory encapsulation of hydrophilic compounds thanks to the drops (G2), but also of lipophilic compounds thanks to the drops (G1), and, d 'on the other hand, has a visual and a texture new in the field of double emulsions which, for obvious reasons, responds to a continuous demand from consumers in this direction. An emulsion according to the invention is also particularly advantageous in terms of kinetic stability, since the drops (G1) or (G2) remain intact on a time scale greater than 1 week, or even greater than 1 month, and even greater than 3 months, at room temperature, for example T = 25 ° C ± 2 ° C, and at room pressure, for example 1013 mba '. As such, it was not obvious that double emulsions are stable at room temperature, for example T = 25 ° C ± 2 ° C, and at room pressure, for example 1013 mbar. This interesting property in terms of kinetic stability is all the more unexpected since the bark of the drops (G1), or even of the drops (G2), described in detail below, is very fine. Thus, no resistance attached to the breaking of the bark is felt by the user at the time of application to a keratin material, and no residual deposit of said bark is moreover observed. This is called evanescent bark. The drops (G1), even the drops (G2), by the nature and the properties of their barks, therefore differ from solid capsules, that is to say capsules with a solid membrane, such as for example those described in WO 2010/063937. Furthermore, the microfluidic process used to manufacture an emulsion according to the invention makes it possible to form macroscopic and monodisperse drops (G1) and (G2). In addition, the microfluidic process allows perfect control of the contents of each phase implemented, and therefore of the concentrations of the encapsulated active agents. According to the invention, the pH of an emulsion is typically between 4.0 and 8.0, in particular between 5.0 and 7.0. The invention also relates to the use of an emulsion according to the invention, for the preparation of a composition, in particular cosmetic. An emulsion according to the invention, or even a composition comprising it, can also be dedicated to the field of medicine, pharmacy or (agro) -food Thus, the invention also relates to a composition, in particular a cosmetic composition, comprising at least one emulsion according to the invention and, in particular, a physiologically acceptable medium. Viscosity The viscosity of the emulsions according to the invention can vary significantly, which makes it possible to obtain various textures. According to one embodiment, an emulsion according to the invention has a viscosity of from 1 mPa.s to 500,000 mPa.s, preferably from 10 mPa.s to 300,000 mPa.s, better still from 400 mPa.s to 100 000 mPa.s, and more particularly from 1000 mPa.s to 30 000 mPa.s, as measured at 25 ° C. The viscosity is measured at ambient temperature, for example T = 25 ° C ± 2 ° C, and at ambient pressure, for example 1013 mbar, by the following method. A Brookfield type viscometer is used, typically a Brookfield RVDV-E digital viscometer (torsional torque of the spring of 7187.0 dyne-cm), which is a rotational viscometer at imposed speed provided with a mobile (designated by the English term "Spindle >>). A speed is imposed on the rotating mobile and the measurement of the torque exerted on the mobile makes it possible to determine the viscosity by knowing the geometry / shape parameters of the mobile used. For example, use a mobile of size No. 04 (Brookfield reference: RV4). The shear rate corresponding to the viscosity measurement is defined by the mobile used and the speed of rotation thereof. The viscosity measurement is carried out over 1 minute at room temperature (T = 25 ° C ± 2 ° C). About 150 g of solution are placed in a beaker with a volume of 250 mL, with a diameter of about 7 cm so that the height of the volume occupied by the 150 g of solution is sufficient to reach the marked gauge on the mobile . Then, we start the viscometer at a speed of 10 rpm and wait until the value displayed on the screen is stable. This measurement gives the viscosity of the fluid tested, as mentioned in the context of the present invention. Continuous external aqueous phase As indicated above, the emulsions according to the invention comprise an external continuous aqueous phase, preferably in the form of a gel, in particular a gel having a viscosity suitable for suspending the drops (G1) and thus contributing to the attractive appearance and unpublished emulsion according to the invention. According to one embodiment, this aqueous phase has a viscosity of between 1 mPa.s and 500,000 mPa.s, preferably between 10 mPa.s and 300,000 mPa.s, better still between 400 mPa.s and 100,000 mPa. s, and more particularly between 1,000 mPa.s and 30,000 mPa.s, as measured at 25 ° C. This viscosity is measured according to the method described above. The external continuous aqueous phase of the emulsions comprises at least water. In addition to distilled or deionized water, water suitable for the invention can also be natural spring water or floral water. According to one embodiment, the mass percentage of water in the external aqueous continuous phase is at least 30%, preferably at least 40%, in particular at least 50%, and better still at least 60%, in particular between 70% and 98%, and preferably between 55% and 95%, in particular between 75% and 85%, relative to the total mass of said external aqueous phase. The external aqueous continuous phase of the emulsion according to the invention can also comprise at least one base. It can include a single base or a mixture of several different bases. When the continuous external aqueous phase of an emulsion according to the invention comprises at least one gelling agent sensitive to pH, the presence of at least one base in said continuous aqueous phase contributes in particular to enhancing the viscosity of the latter. According to one embodiment, the base present in the aqueous phase is an inorganic base. According to one embodiment, the mineral base is chosen from the group consisting of hydroxides of alkali metals and hydroxides of alkaline earth metals. Preferably, the mineral base is an alkali metal hydroxide, and in particular NaOH. According to another embodiment, the base present in the external aqueous phase is an organic base. Among the organic bases, there may be mentioned, for example, ammonia, pyridine, triethanolamine, aminomethylpropanol, or even triethylamine. An emulsion according to the invention can comprise from 0.01% to 10% by weight, preferably from 0.01% to 5% by weight, and preferably from 0.02% to 1% by weight of base, preferably from mineral base, and in particular NaOH, relative to the total weight of said emulsion. According to one embodiment, the emulsions according to the invention, or even the compositions comprising them, do not comprise a surfactant. Drops (G1) As indicated above, the double emulsions according to the invention comprise, as dispersed phase, a water-in-oil emulsion in the form of drops (G1). A drop (G1) according to the invention is composed of a heart, also called inside of the drop, surrounded by a bark, which isolates the inside of the drop from the external aqueous phase of the emulsion. According to one embodiment, the size of the drops (G1) is greater than 30,500 μm, or even greater than 1,000 μm, and better still is between 500 μm and 000 pm, preferably between 1000 pm and 2000 pm, in particular between 800 pm and 1500 pm. In the context of the present invention, the term size designates the diameter, in particular the average diameter, of the drops. According to one embodiment, an emulsion according to the invention is obtained by a microfluidic process as defined below. Consequently, the drops (G1) have a uniform size distribution. Preferably, the fatty phase of the emulsions of the invention consists of a population of monodispersed drops (G1), in particular such that they have an average diameter D of from 500 μm to 3000 μm and a coefficient of variation Cv less than 10% or even less than 3%. In the context of the present description, the term “monodispersed drops” means that the population of drops of the dispersed phase according to the invention has a uniform size distribution. Monodispersed drops have good monodispersity. Conversely, drops with poor monodispersity are said to be polydispersed. According to one mode, the average diameter D of the drops is for example measured by analysis of a photograph of a batch consisting of N drops, by image processing software (Image J). Typically, according to this method, the diameter is measured in pixels, then reported in pm, depending on the size of the container containing the drops of the dispersion. Preferably, the value of N is chosen to be greater than or equal to 30, so that this analysis statistically significantly reflects the distribution of diameters of the drops of said emulsion. The diameter Di of each drop is measured, then the average diameter D is obtained by calculating the arithmetic mean of these values: - 1 N d From these values D h one can also obtain the standard deviation σ of the diameters of the droplets of the dispersion: The standard deviation σ of a dispersion reflects the distribution of diameters D, drops of the dispersion around the mean diameter D. By knowing the mean diameter D e t the standard deviation σ of a dispersion, we can determine that we find 95.4% of the droplet population in the range of diameters 2σ, ϋ + 2σ and q eu | · οη finds 53 2% of the population in the meantime To characterize the monodispersity of the dispersion according to this mode of the invention, the coefficient of variation can be calculated: This parameter reflects the distribution of droplet diameters as a function of their average diameter. The coefficient of variation Cv of the drop diameters (G1) according to this mode of the invention is less than 10%, preferably less than 5%, or even less than 3%. In particular, the emulsions according to the invention comprise from 0.1% to 70%, preferably from 0.5% to 65%, in particular from 1% to 60%, better still from 3% to 50%, and more particularly from 5% to 20%, by weight of drops (G1) (ie formed from the continuous fatty phase and from the internal aqueous phase) relative to the total weight of said emulsion. As indicated above, each drop (G1) comprises a fatty phase corresponding to the fatty phase of the emulsions according to the invention. Fat phase As indicated previously, the fatty phase of the drops (G1) comprises at least one gelling agent. Such a gelling agent is different from anionic polymers, cationic polymers, texturing agents, oils and additional compounds described below. Gelling agent The presence of at least one gelling agent in the fatty phase of the drops (G1) contributes to (i) suspending the drop (s) (G2) within each drop (G1) and (ii) to strengthening the stability kinetics of an emulsion according to the invention, and in particular the stability of the drops (G1) and (G2). Thus, the drops (G1) and (G2) can remain intact on a time scale greater than 1 month, in particular greater than 3 months, or even greater than 6 months, at ambient temperature, for example T = 25 ° C ± 2 ° C, and at ambient pressure, for example 1013mbar. In the context of the invention, and unless otherwise stated, the term “gelling agent” means an agent making it possible to increase the viscosity of the fatty phase of the drops (G1) of the emulsion devoid of said gelling agent, and reach a final viscosity of the gelled fatty phase greater than 20,000 mPa.s, preferably greater than 50,000 mPa.s, better still greater than 100,000 mPa.s, and very particularly greater than 200,000 mPa.s. Preferably, the viscosity of the fatty phase of the drops (G1) of the emulsion in the presence of said gelling agent is between 20,000 and 100,000,000 mPa.s, preferably between 50,000 and 1,000,000 mPa.s, and better between 100,000 to 500,000 mPa.s, at 25 ° C. The choice of gelling agent (s) is made in particular with regard to the nature of the fatty phase of the drops (G1) and / or the desired results, in particular in terms of sensoriality and / or texture. For obvious compatibility reasons, the gelling agent is lipophilic or liposoluble. According to a particular embodiment, when the fatty phase of the drops (G1) also comprises at least one oil, in particular as described below, the choice of oil (s) is made with regard to the nature of the gelling agent (s), and vice versa. Indeed, the oil (s) used must be a satisfactory solvent for the gelling agent. This choice falls within the general competence of a person skilled in the art. According to one embodiment, the emulsions according to the invention comprise from 0.5% to 99.99%, preferably from 1% to 70%, in particular from 1.5% to 50%, better still from 2% to 40 %, in particular from 2.5% to 30%, and preferably from 10% to 20%, by weight of gelling agent (s) relative to the total weight of the fatty phase of the drops (G1). According to one embodiment, the gelling agent is chosen from organic or mineral, polymeric or molecular lipophilic gelling agents, fatty substances that are solid at room temperature and pressure, and their mixtures. Lipophilic gelling agent (s) The gelling agents which can be used according to the invention can be organic or mineral, polymeric or molecular lipophilic gelling agents. According to one embodiment, the gelling agent is chosen from the group consisting of modified clays, silicas, such as fumed silica, and their mixtures. As mineral lipophilic gelling agent, mention may be made of clays which may be modified, such as hectorites modified with C 10 -C 22 ammonium chloride, such as hectorite modified with di-stearyl di-methyl ammonium chloride, such as, for example. , that marketed under the name of Bentone 38V® by the company ELEMENTIS. Mention may also be made of hectorite modified with distearyldimethylammonium chloride, also known as quaternium-18 bentonite, such as the products sold or manufactured under the names Bentone 34 by the company Rheox, Claytone XL, Claytone 34 and Claytone 40 sold or manufactured by the company Southern Clay, the modified clays known under the name of benzalkonium and quaternium-18 bentonites and marketed or manufactured under the names Claytone HT, Claytone GR and Claytone PS by the company Southern Clay, clays modified with chloride of stearyldimethylbenzoylammonium, known as steralkonium bentonites, such as the products marketed or manufactured under the names Claytone APA and Claytone AF by the company Southern Clay, and Baragel 24 marketed or manufactured by the company Rheox. Mention may also be made of fumed silica optionally hydrophobically treated at the surface, the particle size of which is less than 1 μm. It is indeed possible to chemically modify the surface of the silica, by chemical reaction generating a reduction in the number of silanol groups present on the surface of the silica. Silanol groups can in particular be substituted by hydrophobic groups: a hydrophobic silica is then obtained. The hydrophobic groups can be: - Trimethylsiloxyl groups, which are obtained in particular by treatment of fumed silica in the presence of hexamethyldisilazane. Silicas thus treated are called "Silica silylate" according to the CTFA (8 th edition, 2000). They are for example marketed under the Aerosil R812® references by the company DEGUSSA, CAB-O-SIL TS-530® by the company CABOT; or - Dimethylsilyloxyl or polydimethylsiloxane groups, which are in particular obtained by treatment of fumed silica in the presence of polydimethylsiloxane or dimethyldichlorosilane. Silicas thus treated are called "Silica dimethyl silylate" according to the CTFA (8 th edition, 2000). They are for example marketed under the references Aerosil R972®, and Aerosil R974® by the company DEGUSSA, CAB-O-SIL TS-610® and CAB-O-SIL TS-720® by the company CABOT. Hydrophobic fumed silica in particular has a particle size which can be nanometric to micrometric, for example ranging from around 5 to 200 nm. The polymeric organic lipophilic gelling agents are, for example partially or totally crosslinked elastomeric organopolysiloxanes, of three-dimensional structure, such as those sold under the names KSG6®, KSG16® and KSG18® by the company SHIN-ETSU, from Dow Corning® EL5 7040, of Trefil E-505C® and Trefil E-506C® by the company DOW-CORNING, of Gransil SR-CYC®, SR DMF10®, SR-DC556®, SR 5CYC gel®, SR DMF 10 gel® and SR DC 556 gel® by the company GRANT INDUSTRIES, SF 1204® and JK 113® by the company GENERAL ELECTRIC; ethylcellulose such as that sold under the name Ethocel® by the company DOW CHEMICAL; galactomannans IO having from one to six, particularly two to four hydroxyl groups per saccharide, substituted with a saturated alkyl chain or not, such as guar gum alkylated with alkyl chains to C 6, and in particular in Ci to C 3 and their mixtures. Block copolymers of the “diblock”, “triblock” or “radial” type of the polystyrene / polyisoprene, polystyrene / polybutadiene type such as those marketed under the name Luvitol HSB® by the company BASF, of the polystyrene / copoly type (ethylene- propylene) such as those marketed under the name Kraton® by the company SHELL CHEMICAL CO or else of the polystyrene / copoly (ethylene-butylene) type, mixtures of triblock and radial (star) copolymers in isododecane such as those marketed by the Society PENRECO under the name Versagel®, for example the mixture of butylene / ethylene / styrene triblock copolymer and ethylene / propylene / styrene star copolymer in isododecane (Versagel M 5960). According to one embodiment, the gelling agents which can be used according to the invention can be chosen from the group consisting of polyacrylates; esters of sugar / polysaccharide and fatty acid (s), in particular esters of dextrin and fatty acid (s), esters of inulin and fatty acid (s) or esters of glycerol and d 'Fatty acids ; polyamides; and their mixtures. As lipophilic gelling agent, mention may also be made of polymers with an average molecular weight of less than 100,000, comprising a) a polymer backbone having hydrocarbon repeating units provided with at least one heteroatom, and optionally b) at least one fatty chain pendant and / or at least one terminal fatty chain optionally functionalized, having from 6 to 120 carbon atoms and being linked to these hydrocarbon-based units, as described in applications WO 02/056847, WO 02/47619, in particular the resins of polyamides (in particular comprising alkyl groups having from 12 to 22 carbon atoms) such as those described in US 5,783,657. As an example of a polyamide resin which can be used according to the present invention, there may be mentioned UNICLEAR 100 VG® sold by the company ARIZONA CHEMICAL. It is also possible to use silicone polyamides of the polyorganosiloxane type such as those described in US 5,874,069, US 5,919,441, US 6,051,216 and US 5,981,680. These silicone polymers can belong to the following two families: polyorganosiloxanes comprising at least two groups capable of establishing hydrogen interactions, these two groups being located in the polymer chain, and / or - polyorganosiloxanes comprising at least two groups capable of establishing hydrogen interactions, these two groups being located on grafts or branches. Among the lipophilic gelling agents which can be used in the present invention, mention may also be made of dextrin and fatty acid esters, such as dextrin palmitates. According to one embodiment, the ester of dextrin and of fatty acid (s) according to the invention is a mono- or poly-ester of dextrin and of at least one fatty acid corresponding to the following formula (II): in which : ο n is an integer ranging from 2 to 200, preferably ranging from 20 to 150, and in particular ranging from 25 to 50, o the radicals R 4 , R 5 and R 6 , identical or different, are chosen from hydrogen or an acyl group -COR a in which the radical R a represents a hydrocarbon radical, linear or branched, saturated or unsaturated, having from 5 to 50, preferably from 5 to 25 carbon atoms, provided that at least one of said radicals R 4 , R 5 or R 6 is different from hydrogen. According to one embodiment, R 4j R 5 and R 6 represent, independently of each other, H or an acyl group -COR a in which R a is a hydrocarbon radical as defined above, provided that at least two of said radicals R 4 , R 5 or R 6 are identical and different from hydrogen. According to one embodiment, when the radicals R 4 , R 5 and R 6 , which are identical or different, represent a radical -COR a , these can be chosen from the radicals caprylyl, caproyl, lauroyl, myristyle, palmityl, stearyl, eicosanyl, docosanoyl, isovaleryl, 2-ethyl butyryl, éthylméthylacétyle, isoheptanyle, 2-ethyl hexanyl, isononanyle, isodécanyle, isotridécanyle, isomyristyle, isopalmityle, Io isostearyl isohexanyle, decenyl, dodecenyl, tetradecenyl, myristyl, hexadécénoyle, palmitoleyl, oleyl, élaidyle , eicosenyl, sorbyl, linoleyl, linolenyl, punicyl, arachidonyl, stearolyl, and mixtures thereof. Among the esters of dextrin and of fatty acid (s), mention may, for example, be made of dextrin palmitates, dextrin myristates, dextrin palmitates / ethylhexanoates and their mixtures. Mention may in particular be made of the dextrin and fatty acid esters sold under the names Rheopearl® KL2 (INCI name: dextrin palmitate), Rheopearl® TT2 (INCI name: dextrin palmitate ethylhexanoate), and Rheopearl® MKL2 (INCI name) : dextrin myristate) by the company Miyoshi Europe. Among the lipophilic gelling agents which can be used in the present invention, mention may also be made of esters of inulin and of fatty acid. Mention may in particular be made of the esters of inulin and of fatty acid (s) sold under the names Rheopearl® ISK2 or Rheopearl® ISL2 (INCI name: Stearoyl Inulin) by the company Miyoshi Europe. According to one embodiment, the gelling agent is chosen from polyacrylates resulting from the polymerization of C 1 -C 30 alkyl acrylate (s), preferably C 1 -C 4 alkyl acrylate (s) - C 24 , and even more preferably of C 8 -C 22 alkyl acrylate (s). According to one embodiment, the polyacrylates are polymers of acrylic acid esterified with a fatty alcohol whose saturated carbon chain comprises from 10 to 30 carbon atoms, preferably from 14 to 24 carbon atoms, or a mixture of said fatty alcohols . Preferably, the fatty alcohol comprises 18 carbon atoms or 22 carbon atoms. Among the polyacrylates, mention may be made more particularly of stearyl polyacrylate, behenyl polyacrylate. Preferably, the gelling agent is stearyl polyacrylate or behenyl polyacrylate. Mention may in particular be made of the polyacrylates marketed under the 5 names Intelimer® (INCI name: Poly Ci 0 -C 30 alkyl acrylate), in particular Intelimer® 13.1 and Intelimer® 13.6, by the company Airproducts. According to one embodiment, the gelling agent is an ester of glycerol and fatty acid (s), in particular a mono-, di- or triester of glycerol and fatty acid (s). Typically, said glycerol ester and fatty acid (s) can be used alone or as a mixture. According to the invention, it may be a glycerol ester and a fatty acid or a glycerol ester and a mixture of fatty acids. According to one embodiment, the fatty acid is chosen from the group consisting of behenic acid, isooctadecanoic acid, stearic acid, eicosanoic acid, and their mixtures. According to one embodiment, the glycerol ester and fatty acid (s) has the following formula (III): O 0 0 (III) in which: R b R 2 and R 3 are, independently of one another, chosen from 20 H and a saturated alkyl chain comprising from 4 to 30 carbon atoms, at least one of R 1; R 2 and R 3 being different from H. According to one embodiment, R n R 2 and R 3 are different. According to one embodiment, R n R 2 and / or R 3 represents a saturated alkyl chain comprising from 4 to 30, preferably from 12 to 22, and preferably from 18 to 22 carbon atoms. According to one embodiment, the ester of glycerol and of fatty acid (s) corresponds to a compound of formula (III) in which Rt = H, R 2 = C 21 H 43 and R 3 = C 19 H 40 . According to one embodiment, the glycerol ester and fatty acid (s) corresponds to a compound of formula (III) in which Ri = R 2 = R 3 = C 2 iH 43 . According to one embodiment, the ester of glycerol and of fatty acid (s) corresponds to a compound of formula (III) in which Ri = R 2 = H, and R 3 = Ci 9 H 40 . According to one embodiment, the ester of glycerol and of fatty acid (s) corresponds to a compound of formula (III) in which FL = R 2 = H, and R 3 = C 17 H 35 . Mention may in particular be made of the glycerol and fatty acid esters sold under the names Nomcort HK-G (INCI name: Glyceryl behenate / eicosadioate) and Nomcort SG (INCI name: Glyceryl tribehenate, isostearate, eicosadioate) Nisshin Oillio company. Raincoats) By “wax” is meant within the meaning of the invention, a lipophilic compound, solid at room temperature (25 ° C.), with change of sdide / reversible liquid state, having a melting point greater than or equal to 30 ° C. can go up to 120 ° C. The protocol for measuring this melting point is described below. The waxes capable of being used in an emulsion according to the invention can be chosen from waxes, solid, deformable or not at room temperature, of animal, vegetable, mineral or synthetic origin and their mixtures. It is possible in particular to use hydrocarbon waxes such as beeswax, lanolin wax, and Chinese insect waxes; rice wax, Carnauba wax, Candellila wax, Ouricurry wax, Alfa wax, cork fiber wax, sugar cane wax, Japanese wax and sumac wax ; montan wax, microcrystalline waxes, paraffins and ozokerite; polyethylene waxes, waxes obtained by the Fisher-Tropsch synthesis and waxy copolymers and their esters. Mention may in particular be made of the waxes marketed under the names Kahlwax®2039 (INCI name: Candelilla cera) and Kahlwax®6607 (INCI name: Helianthus Annuus Seed Wax) by the company Kahl Wachsraffinerie, Casid HSA (INCI name: Hydroxystearic Acid) SACI CFPA, Performa®260 (INCI name: Synthetic wax) and Performa®103 (INCI name: Synthetic wax) by New Phase, and AJK-CE2046 (INCI name: Cetearyl alcohol, dibutyl lauroyl glutamide, dibutyl ethylhaxanoyl glutamide) by the company Kokyu Alcohol Kogyo. Mention may also be made of the waxes obtained by catalytic hydrogenation of animal or vegetable oils having fatty chains, linear or branched, of C 8 -C 32 . Among these, mention may in particular be made of hydrogenated jojoba oil, hydrogenated sunflower oil, hydrogenated castor oil, hydrogenated coconut oil and hydrogenated lanolin oil, di- tetrastearate trimethylol-1,1,1 propane) sold under the name "HEST 2T-4S" by the company HETERENE, di- (trimethylol-1,1,1 propane) tetrabehenate sold under the name HEST 2T-4B by the company HETERENE. It is also possible to use the waxes obtained by transesterification and hydrogenation of vegetable oils, such as castor oil or olive oil, such as the waxes sold under the names of Phytowax ricin 16L64® and 22L73® and Phytowax Olive 18L57 by the company SOPHIM. Such waxes are described in application FR 2 792 190. It is also possible to use silicone waxes which can advantageously be substituted polysiloxanes, preferably with a low melting point. îo Among the commercial silicone waxes of this type, there may be mentioned in particular those sold under the names Abilwax 9800, 9801 or 9810 (GOLDSCHMIDT), KF910 and KF7002 (SHIN ETSU), or 176-1118-3 and 176-11481 (GENERAL ELECTRIC). The silicone waxes which can be used can also be alkyl or alkoxydimethicones such as the following commercial products: Abilwax 2428, 2434 and 2440 (GOLDSCHMIDT), or VP 1622 and VP 1621 (WACKER), as well as the (C 2 oC 6o ) alkyldimethicones, in particular the (C 30 -C 4 5) alkyldimethicones such as the silicone wax sold under the name SF- 1642 by the company GE-Bayer Silicones. It is also possible to use hydrocarbon waxes modified with silicone or fluorinated groups such as for example: siliconyl candelilla, siliconyl beeswax and Fluorobeeswax from Koster Keunen. The waxes can also be chosen from fluorinated waxes. Butter (s) or pasty fatty substances By “butter” (also called “pasty fatty substance”) within the meaning of the present invention, is meant a lipophilic fatty compound with reversible solid / liquid state change and comprising at the temperature of 25 ° C. a liquid fraction and a fraction solid, and at atmospheric pressure (760 mm Hg). In other words, the starting melting temperature of the pasty compound can be less than 25 ° C. The liquid fraction of the pasty compound measured at 25 ° C can represent from 9% to 97% by weight of the compound. This liquid fraction at 25 ° C preferably represents between 15% and 85%, more preferably between 40% and 85% by weight. Preferably, the butter or butter has a melting temperature below 60 ° C. Preferably, the butter or butter has a hardness of 6 MPa or less. Preferably, the pasty butters or fatty substances have an anisotropic crystalline organization in the solid state, visible by X-ray observations. Within the meaning of the invention, the melting point corresponds to the temperature of the most endothermic peak observed in thermal analysis (DSC) as described in standard ISO 11357-3; 1999. The melting point of a pasty or a wax can be measured using a differential scanning calorimeter (DSC), for example the calorimeter sold under the name DSC Q2000 by the company TA Instruments. Concerning the measurement of the melting temperature and the determination of the end-of-melting temperature, the protocols for preparing the samples and for measuring are as follows: A sample of 5 mg of pasty fatty substance (or butter) or of wax previously heated at 80 ° C and taken with magnetic stirring using a spatula also heated is placed in an airtight aluminum capsule, or crucible. Two tests are carried out to ensure the reproducibility of the results. The measurements are carried out on the calorimeter mentioned above. The oven is subjected to a nitrogen sweep. The cooling is ensured by the RCS 90 heat exchanger. The sample is then subjected to the following protocol by first being brought to temperature at 20 ° C., then subjected to a first temperature rise ranging from 20 ° C. to 80 ° C, at the heating rate of 5 ° C / minute, then is cooled from 80 ° C to -80 ° C at a cooling rate of 5 ° C / minute and finally subjected to a second temperature rise from -80 ° C to 80 ° C at a heating rate of 5 ° C / minute. During the second temperature rise, the variation in the difference in power absorbed by the empty crucible and by the crucible containing the butter sample is measured as a function of the temperature. The melting point of the compound is the value of the temperature corresponding to the top of the peak of the curve representing the variation of the difference in absorbed power as a function of the temperature. The end of melting temperature corresponds to the temperature at which 95% of the sample has melted. The liquid fraction by weight of the butter (or pasty fatty substance) at 25 ° C is equal to the ratio of the enthalpy of fusion consumed at 25 ° C to the enthalpy of fusion of the butter. The enthalpy of fusion of the butter or pasty compound is the enthalpy consumed by the compound to pass from the solid state to the liquid state. Butter is said to be in the solid state when all of its mass is in crystalline solid form. Butter is said to be in a liquid state when all of its mass is in liquid form. The enthalpy of fusion of the butter is equal to the integral of the whole of the melting curve obtained using the above-mentioned calorimeter, with a rise in temperature of 5 ° C. or 10 ° C. per minute, according to the standard. ISO 113573: 1999. The enthalpy of fusion of butter is the amount of energy required to move the compound from the solid state to the liquid state. It is expressed in J / g. The enthalpy of fusion consumed at 25 ° C is the amount of energy absorbed by the sample to pass from the solid state to the state it presents at 25 ° C consisting of a liquid fraction and a solid fraction. The liquid fraction of the butter measured at 32 ° C. preferably represents from 30% to 100% in weight of the compound, preferably from 50% to 100%, more preferably from 60% to 100% by weight of the compound. When the liquid fraction of the butter measured at 32 ° C is equal to 100%, the temperature at the end of the melting range of the pasty compound is less than or equal to 32 ° C. The liquid fraction of the butter measured at 32 ° C is equal to the ratio of the enthalpy of fusion consumed at 32 ° C to the butter melt. The enthalpy of fusion consumed at 32 ° C is calculated in the same way as the enthalpy of fusion consumed at 23 ° C. Concerning the hardness measurement, the sample preparation and measurement protocols are as follows: the emulsion according to the invention or the butter is placed in a mold 75 mm in diameter which is filled to about 75% of its height . In order to get rid of the thermal past and to control crystallization, the mold is placed in the Vôtsch VC0018 programmable oven where it is first heated to 80 ° C for 60 minutes, then cooled from 80 ° C to 0 ° C at a cooling rate of 5 ° C / minute, then left at the stabilized temperature of 0 ° C for 60 minutes, then subjected to a temperature rise ranging from 0 ° C to 20 ° C, at a heating rate 5 ° C / minute, then left at the stabilized temperature of 20 ° C for 180 minutes. The compression force measurement is carried out with the TA / TX2Î texturometer from Swantech. The mobile used is chosen according to the texture: - cylindrical mobile in steel with a diameter of 2 mm for very rigid raw materials; - 12 mm diameter cylindrical steel mobile for less rigid raw materials. The measurement comprises 3 stages: a 1st stage after automatic detection of the surface of the sample where the mobile moves at the measuring speed of 0.1 mm / s, and enters the emulsion according to the invention or the butter at a penetration depth of 0.3 mm, the software notes the value of the maximum force reached; a 2nd so-called relaxation step where the mobile remains in this position for one second and where the force is noted after 1 second of relaxation; finally a 3rd step called withdrawal or the mobile returns to its initial position at the speed of 1 mm / s and the energy of withdrawal of the probe is noted (negative force). The hardness value measured during the first step corresponds to the maximum compression force measured in Newton divided by the surface area of the texturometer cylinder expressed in mm 2 in contact with the butter or the emulsion according to the invention. The hardness value obtained is expressed in mega-pascals or MPa. The pasty fatty substance or butter can be chosen from synthetic compounds and compounds of plant origin. A pasty fatty substance can be obtained by synthesis from starting materials of plant origin. The pasty fatty substance is advantageously chosen from: lanolin and its derivatives such as lanolin alcohol, oxyethylenated lanolines, acetylated lanolin, lanolin esters such as isopropyl lanolate, oxypropylenated lanolines, - polymeric or non-polymeric silicone compounds such as polydimethysiloxanes of high molecular weights, polydimethysiloxanes with side chains of the alkyl or alkoxy type having from 8 to 24 carbon atoms, in particular stearyl dimethicones, - polymeric or non-polymeric fluorinated compounds, - vinyl polymers, in particular - homopolymers of olefins, - olefin copolymers, - homopolymers and copolymers of hydrogenated dienes, - linear or branched oligomers, homo or copolymers of alkyl (meth) acrylates preferably having a C 8 -C 30 alkyl group, - homo oligomers and copolymers of vinyl esters having C 8 -C 30 alkyl groups, - homo oligomers and copolymers of vinyl ethers having C 8 -C 30 alkyl groups, - the liposoluble polyethers resulting from the polyetherification between one or more C 2 -C 100 , preferably C 2 -C 50 , diols, - esters and polyesters, and - their mixtures. According to a preferred embodiment of the invention, the particular butters are of vegetable origin such as those described in Ullmann's Encyclopedia of Industrial Chemistry ("Fats and Fatty Oils", A. Thomas, published on 06/15/2000, D01 : 10.1002 / 14356007.a10_173, point 13.2.2.2F. Shea Butter, Borneo Tallow, and Related Fats (Vegetable Butters)). Mention may more particularly be made of the triglycerides C10-C18 (INCI name: C10-18 Triglycerides) comprising at the temperature of 25 ° C and at atmospheric pressure (760 mm Hg) a liquid fraction and a solid fraction, the shea butter , Nilotica shea butter (Butyrospermum parkii), Galam butter, (Butyrospermum parkii), Borneo butter or fat or tengkawang tallow) (Shorea stenoptera), Shorea butter, Illipé butter, Madhuca or Bassia butter Madhuca longifolia, mowrah butter (Madhuca Latifolia), Katiau butter (Madhuca mottleyana), Phulwara butter (M. butyracea), mango butter (Mangifera indica), Murumuru butter (Astrocatyum murumuru), butter Kokum (Garcinia Indica), Ucuuba butter (Virola sebifera), Tucuma butter, Painya butter (Kpangnan) (Pentadesma butyracea), coffee butter (Coffea arabica), apricot butter (Prunus Armeniaca ), Macadamia butter (Macadamia Temifolia), grape seed butter (Vitis vinifera), avocado butter (Persea gratissima), olive butter (Olea europaea), sweet almond butter (Prunus amygdalus dulcis), cocoa butter (Theobroma cacao) and sunflower butter, butter under the name INCI Astrocaryum Murumuru Seed Butter, butter under the name INCI Theobroma Grandiflorum Seed Butter, and butter under the name INCI Irvingia Gabonensis Kernel Butter, jojoba esters (mixture of wax and hydrogenated jojoba oil) (INCI name: Jojoba esters) and ethyl esters of shea butter (INCI name: Shea butter ethyl esters), and mixtures thereof. According to a preferred embodiment, a gelling agent for the fatty phase of the drops (G1) according to the invention is a thermosensitive gelling agent, ie one which reacts to heat, and in particular is a gelling agent which is solid at room temperature and liquid at a temperature above 40 ° C, preferably above 50 ° C. Thus, the gelling agent is preferably chosen from dextrin palmitates. According to another preferred embodiment, a gelling agent for the fatty phase of the drops (G1) according to the invention is a thixotropic gelling agent. This embodiment is advantageous in that an emulsion according to the invention can be obtained by implementing a microfluidic process at room temperature. Thus, the gelling agent is preferably chosen from fumed silica optionally hydrophobic surface treatment. According to a particular embodiment, an emulsion according to the invention, in particular the fatty phase of the drops (G1), does not comprise an elastomer gel comprising at least one dimethicone, in particular as marketed by NuSil Technology under the name CareSil ™ CXG-1104 (INCI: Dimethicone (and) Dimethicone / Vinyl Dimethicone Crosspolymer). According to one embodiment, the fatty phase of the drops (G1) can also comprise at least one oil. The fatty phase of the drops (G1) can therefore be designated according to this embodiment as an oily phase. Oils) The drops (G1) according to the invention can comprise a single oil or a mixture of several oils. An emulsion according to the invention can therefore comprise at least one, at least two, at least three, at least four, at least five, or even more, of oil (s) as described below. . “Oil” means a fatty substance which is liquid at room temperature (25 ° C). As oils which can be used in the emulsion of the invention, there may be mentioned for example: - hydrocarbon oils of vegetable origin, in particular as described below; - hydrocarbon oils of animal origin, such as perhydrosqualene and squalane; - synthetic esters and ethers, in particular of fatty acids, such as oils of formulas R1COOR2 and RiOR 2 in which Ri represents the remainder of a fatty acid Cg to C 2 g, and R 2 represents a hydrocarbon chain, branched or not, C 3 to C 30 , such as, for example, Purcellin oil, isononyl isononanoate, isodecyl neopentanoate, isopropyl myristate, ethyl-2-hexyl palmitate, octyl-2-dodecyl stearate, octyl-2-dodecyl erucate, isostearyl isostearate; hydroxylated esters such as isostearyl lactate, octylhydroxystearate, octyldodecyl hydroxystearate, diisostearyl malate, triisocetyl citrate, heptanoates, octanoates, decanoates of fatty alcohols; polyol esters, such as propylene glycol dioctanoate, neopentylglycol diheptanoate and diethylene glycol diisononanoate; and pentaerythritol esters such as pentaerythrityl tetrabehenate (DUB PTB) or pentaerythrityl tetraisostearate (Prisorin 3631); - linear or branched hydrocarbons, of mineral or synthetic origin, such as paraffin oils, volatile or not, and their derivatives, petrolatum, polydecenes, hydrogenated polyisobutene such as Parléam oil; - silicone oils, such as, for example, volatile or non-volatile polymethylsiloxanes (PDMS) with a linear or cyclic silicone chain, liquid or pasty at room temperature, in particular cyclopolydimethylsiloxanes (cyclomethicones) such as cyclohexasiloxane and cyclopentasiloxane; polydimethylsiloxanes (or dimethicones) comprising alkyl, alkoxy or phenyl groups, during or at the end of the silicone chain, groups having from 2 to 24 carbon atoms; phenylated silicones such as phenyltrimethicones, phenyldimethicones, phenyltrimethylsiloxydiphenyl-siloxanes, diphenyldimethicones, diphenylmethyldiphenyl trisiloxanes, 2-phenylethyltrimethylsiloxysilicates, and polymethylphenyls; - fatty alcohols having from 8 to 26 carbon atoms, such as cetyl alcohol, stearyl alcohol and their mixture (cetylstearyl alcohol), or octyldodecanol; - partially hydrocarbon and / or silicone fluorinated oils such as those described in document JP-A-2-295912; - and their mixtures. According to a preferred embodiment, the oil is chosen from esters and synthetic ethers, preferably esters of formula R1COOR2, in which Ri represents the residue of a fatty acid Cg to C 2 g, and R 2 represents a C 3 to C 30 hydrocarbon chain, branched or not. According to one embodiment, the oil is chosen from fatty alcohols having from 8 to 26 carbon atoms. According to one embodiment, the oil is chosen from hydrocarbon oils having from 8 to 16 carbon atoms, and in particular branched C 8 -C 16 alkanes (also called isoparaffins or isoalkanes), such as isododecane (also called 2-methylundecane), isodecane, isohexadecane, and, for example, oils sold under the trade names of Isopars® or Permethyls®. According to a preferred embodiment, the oil is chosen from the group consisting of isononyl isononanoate, dimethicone, isohexadecane, polydimethylsiloxane, octyldodecanol, isodecyl neopentanoate and their mixtures . According to another preferred embodiment, the fatty phase of the drops (G1) comprises an oil chosen from silicone oils. Preferably, the fatty phase of the drops (G1) does not include other oils other than silicone oils. Preferably, the oils present in the fatty phase of the drops (G1) are silicone oils. According to a preferred embodiment, an emulsion according to the invention comprises at least 1% by weight of oil (s) relative to the total weight of said emulsion. According to another embodiment, an emulsion according to the invention, in particular the fatty phase of the drops (G1), does not comprise polydimethylsiloxane (PDMS), and preferably does not comprise silicone oil. According to another embodiment, an emulsion according to the invention does not include vegetable oil. According to yet another embodiment, the fatty phase of the drops (G1) of an emulsion according to the invention comprises at least one hydrocarbon-based oil of vegetable origin. As vegetable oils, mention may in particular be made of liquid triglycerides of C 4 -Ci 0 fatty acids such as triglycerides of heptanoic or octanoic acids or alternatively, for example, sunflower, corn, soybean, squash, and seed oils. grapes, sesame, hazelnut, apricot, macadamia, macaw, castor, avocado, triglycerides of caprylic / capric acids (INCI name: Caprylic / Capric Triglycéride) like those sold by the company Stearineries Dubois or those available under the trade names "Miglyol 810 >>," Miglyol 812 >> and "Miglyol 818 >> by the company Dynamit Nobel, jojoba oil, shea butter oil, and their mixture. Preferably, the vegetable oil is chosen from those rich in polyunsaturated fatty acids. The term “unsaturated fatty acid” within the meaning of the present invention means a fatty acid comprising at least one double bond. They are more particularly fatty acids with long chains, that is to say which can have more than 14 carbon atoms. The unsaturated fatty acids can be in acid form, or in the form of a salt, such as for example their calcium salt, or also in the form of derivatives, in particular of fatty acid ester (s). Preferably, the vegetable oil is chosen from oils rich in long chain fatty acids, that is to say which may have more than 14 carbon atoms, and better still in unsaturated fatty acids containing from 18 to 22 carbon atoms , in particular in ω-3 and ω-6 fatty acids. Thus, advantageously, the vegetable oils are chosen from the oils of evening primrose, borage, blackcurrant seeds, hemp, nuts, soy, sunflower, wheat germ, fenugreek, muscat rose, echium, argan, baobab, rice bran, sesame, almond, hazelnut, chia, flax, olive, avocado, safflower, coriander, rapeseed (especially Brassica naptus ), and their mixtures. Preferably, the vegetable oil is chosen from matt and non-shiny oils. Moringa oil may in particular be cited as such. Advantageously, when the fatty phase of the drops (G1) of an emulsion according to the invention comprises at least one gelling agent chosen from esters of sugar or polysaccharide and fatty acid (s), in particular dextrin and fatty acid (s), and very particularly chosen from the group consisting of dextrin palmitates, dextrin myristates, dextrin palmitates / ethylhexanoates, and mixtures thereof, said fatty phase of the drops (G1) also comprises at least one oil having a refractive index close to that of the gelling agent (s), namely an oil having a refractive index, at room temperature (25 ° C.) and atmospheric pressure, between 1.2 and 1 , 8, preferably between 1.3 and 1.7, in particular between 1.4 and 1.6, and better still between 1.45 and 1.55. This embodiment is advantageous in that it improves the transparency of the fatty phase of the drops (G1), and therefore the transparency of the emulsion according to the invention. Advantageously, the oil having a refractive index of between 1.2 and 1.8 is a silicone oil, in particular a phenylated silicone oil. Mention may be made, as silicone oils in accordance with the invention, of volatile or non-volatile polymethylsiloxanes (PDMS) with a linear or cyclic silicone chain, liquid or pasty at room temperature, in particular cyclopolydimethylsiloxanes (cyclomethicones) such as cyclohexasiloxane and cyclopentasiloxane; polydimethylsiloxanes (or dimethicones) comprising alkyl, alkoxy or phenyl groups, pendant or at the end of the silicone chain, groups having from 2 to 24 carbon atoms; phenylated silicones such as phenyl (especially diphénylsiloxyphényltriméthicone), phenyl dimethicones, phenyltrimethylsiloxydiphenylsiloxanes, diphenyl dimethicones, diphenylmethyldiphenyltrisiloxanes, 2-phenylethyl, polymethylphenylsiloxanes, and mixtures thereof. According to a particular embodiment, the content of vegetable oil (s) in the fatty phase of the drops (G1) of an emulsion according to the invention is between 0% and 40%, preferably between 0.1 % and 25%, and in particular between 1% and 20%, by weight relative to the total weight of said fatty phase of the drops (G1). According to one embodiment, the emulsions according to the invention comprise from 0% to 99.49%, preferably from 5% to 95%, in particular from 20% to 90%, and better still from 30% to 80%, or even from 50% to 70%, by weight of oil (s) relative to the total weight of the fatty phase of the drops (G1). Drops (G2) As indicated above, each drop (G1) comprises at least one drop (G2) comprising the internal aqueous phase. Preferably, each drop (G1) comprises a single drop (G2) comprising the internal aqueous phase. A drop (G2) according to the invention is composed of a heart, also called the interior of the drop. Optionally, a drop (G2) according to the invention is surrounded by a bark, which isolates the interior of the drop from the fatty phase of the emulsion. According to one embodiment, the size of the drops (G2) is greater than 10 pm, or even greater than 50 pm, and better is between 10 pm and 2000 pm, in particular between 50 pm and 1500 pm, better between 100 pm and 1100 pm, in particular between 200 pm and 800 pm, and better still between 300 pm and 700 pm. In particular, an emulsion according to the invention comprises from 0.01% to 50%, preferably from 0.1% to 40%, in particular from 1% to 30%, and better still from 2.5% to 20%, by weight of drops (G2) relative to the total weight of said emulsion. According to one embodiment, and as indicated above, an emulsion according to the invention is obtained by a microfluidic process as defined below. Consequently, the drops (G2) have a uniform size distribution. Preferably, the internal aqueous phase of the emulsions of the invention consists of a population of monodispersed drops (G2), in particular such that they have an average diameter D of from 10 pm to 2000 pm and a coefficient of variation Cv less than 10% or even less than 3%, measured according to the methods described above. Preferably, the drops (G1) and (G2) are respectively monodispersed drops as defined above. For obvious reasons, for a given population of drops (G1), the average diameter of the drops (G1) is greater than the average diameter of the drops (G2). According to one embodiment, in the emulsions according to the invention, the volume fraction p (IF / (IF + MF) is between 0.1 and 0.7, preferably between 0.3 and 0.6, and better between 0.4 and 0.5, where: - IF represents the total volume of the drops (G2), and - MF represents the total volume of the drops (G1) (and therefore without the total volume of the drops (G2)). According to one embodiment, an emulsion according to the invention can comprise at least two populations of drops (G1) which differ from one another by, in particular, the diameter of the drops (G1) and / or the nature of the materials drops (G1) and / or the raw material content of the drops (G1) and / or the diameter of the drops (G2) and / or the nature of the raw materials of the drops (G2) and / or the raw material content drops (G2). The term “raw materials” means any type of compound capable of being used in the fatty phase of the drops (G1) and the internal aqueous phase of the drops (G2), in particular cationic polymers, anionic polymers, oils, gelling agents, texturing agents, active agents and additional compounds described in the present description. Bark of drops (G1) and optionally drops (G2) As mentioned previously, the drops (G1), and optionally the drops (G2), according to the invention are surrounded by a bark (also designated by the term "membrane"). According to the invention, the drops (G1), and optionally the drops (G2), obtained can have a very thin bark, in particular of thickness less than 1% of the diameter of the drops. The thickness of the bark is thus preferably less than 1 μm and is too small to be measured by optical methods. According to one embodiment, the thickness of the bark of the drops (G1), and optionally of the drops (G2), is less than 1000 nm, in particular between 1 and 500 nm, preferably less than 100 nm, advantageously less than 50 nm, preferably less than 10 nm, and very particularly from 100 nm to 300 nm. The measurement of the thickness of the bark of the drops (G1), and optionally of the drops (G2), of the invention can be carried out by the small-angle X-ray Scattering method. , as implemented in Sato et al. J. Chem. Phys. 111, 1393-1401 (2007). For this, the drops are produced using deuterated water, then are washed three times with a deuterated oil, such as for example a deuterated oil of the hydrocarbon type (octane, dodecane, hexadecane). After washing, the drops are then transferred to the Neutron cell in order to determine the spectrum l (q); q being the wave vector. From this spectrum, classical analytical treatments (REF) are applied in order to determine the thickness of the hydrogenated crust (not deuterated). According to one embodiment, the bark surrounding the drops (G1), and optionally the drops (G2), is stiffened, which in particular gives good resistance to the drops and reduces, or even prevents, their coalescence. This bark is typically formed by coacervation, that is to say by precipitation of polymers charged with opposite charges. Within a coacervate, the bonds binding the charged polymers to each other are of the ionic type, and are generally stronger than the bonds present within a membrane of the surfactant type. The bark is formed by coacervation of at least two charged polymers of opposite polarity (or polyelectrolyte) and preferably in the presence of a first polymer, of cationic type, and of a second polymer, different from the first polymer, of type anionic. These two polymers act as stiffening agents for the membrane. The formation of the coacervate between these two polymers is generally caused by a modification of the conditions of the reaction medium (temperature, pH, concentration of reagents, etc.). The coacervation reaction results from the neutralization of these two polymers charged with opposite polarities and allows the formation of a membrane structure by electrostatic interactions between the anionic polymer and the cationic polymer. The membrane thus formed around each drop typically forms a bark which completely encapsulates the heart of the drop and thus isolates the heart of the drop from the continuous aqueous phase. Anionic polymers (PA1) and optionally (PA2) The external aqueous phase comprises at least one anionic polymer (PA1) and, optionally, the internal aqueous phase also comprises at least one anionic polymer (PA2). When the internal aqueous phase also comprises at least one anionic polymer (PA2), the polymers (PA1) and (PA2) may be identical or different. îo Preferably, the anionic polymer (s) (PA1), or even the anionic polymer (s) (PA2) when it (s) is / are present, is / are hydrophilic, that is to say soluble or dispersible in water. In the context of the present description, the term “anionic polymer” (or polymer of anionic type) means a polymer comprising chemical functions of anionic type. We can also speak of an anionic polyelectrolyte. By chemical function of anionic type, we mean a chemical function AH capable of yielding a proton to give a function A. Depending on the conditions of the medium in which it is found, the anionic type polymer therefore has chemical functions in AH form, or in the form of its conjugate base A. As an example of anionic type chemical functions, mention may be made of the carboxylic acid functions -COOH, optionally present in the form of a carboxylate anion -COO-. As an example of anionic type polymer, mention may be made of any polymer formed by the polymerization of monomers at least part of which carries anionic type chemical functions, such as carboxylic acid functions. Such monomers are, for example, acrylic acid, maleic acid, or any ethylenically unsaturated monomer comprising at least one carboxylic acid function. Thus, preferably, the anionic polymers (PA1) and (PA2), identical or different, are polymers comprising monomeric units comprising at least one carboxylic acid function. Examples of anionic polymers suitable for implementing the invention include copolymers of acrylic acid or maleic acid and other monomers, such as acrylamide, alkyl acrylates, C 5 -C 8 alkyl acrylates, C 10 -C 30 alkyl acrylates, alkyl methacrylates C 12 -C 22 , methoxypolyethylene glycol methacrylates, hydroxyester acrylates, crosspolymer acrylates, and mixtures thereof. According to one embodiment, the anionic polymers according to the invention are chosen from carbomers and crosslinked acrylate / Ci 0 - 30 alkyl acrylate copolymers. Preferably, the anionic polymers (PA1) and (PA2) according to the invention are carbomers. According to one embodiment, the bark of the drops (G1) comprises at least one anionic polymer (PA1), such as for example a carbomer. According to one embodiment, the internal aqueous phase also comprises at least one anionic polymer (PA2), so that the shell of the drops (G2) comprises at least one anionic polymer (PA2), such as for example a carbomer . In the context of the invention, and unless otherwise stated, the term “carbomer” means an optionally crosslinked homopolymer resulting from the polymerization of acrylic acid. It is therefore a poly (acrylic acid) possibly crosslinked. Among the carbomers of the invention, mention may be made of those sold under the names Tego®Carbomer 340FD from Evonik, Carbopol® 981 from Lubrizol, Carbopol ETD 2050 from Lubrizol, or even Carbopol Ultrez 10 from Lubrizol. According to one embodiment, the term “carbomer” or “carbomer” or “Carbopol®” is intended to mean a polymer of high molecular weight acrylic acid crosslinked with allylic sucrose or allyl ethers of pentaerythritol (handbook of Pharmaceutical Excipients, 5 th Edition, plll). For example, it is Carbopol ®10, Carbopol®934, Carbopol®934P, Carbopol®940, Carbopol®941, Carbopol®71G, Carbopol®980, Carbopol®971 P or Carbopol® 974P. According to one embodiment, the viscosity of said carbomer is between 4,000 and 000 cP at 0.5% w / w. Carbomers have other names: polyacrylic acids, carboxyvinyl polymers or carboxy polyethylenes. According to the invention, the anionic polymer (PA1), and optionally the anionic polymer (PA2), can also be a crosslinked acrylate / C 1o - 3 o alkyl acrylate copolymer (INCI name: acrylates / C 10 - 30 alkyl acrylate Crosspolymer) as defined above. According to the invention, the emulsions according to the invention can comprise a carbomer and a crosslinked acrylate / C 10 - 30 alkyl acrylate copolymer. According to one embodiment, an emulsion according to the invention comprises from 0.01% to 5%, preferably from 0.05% to 2%, and better still from 0.1% to 0.5%, by weight of polymer (PA1) relative to the total weight of said emulsion. According to one embodiment, when the drops (G2) further comprise a shell as described above, an emulsion according to the invention comprises from 0.001% to 0.5%, preferably from 0.005% to 0.5%, and better still from 0.01% to 0.1%, by weight of polymer (PA2) relative to the total weight of said emulsion. According to the invention, the above-mentioned emulsion can comprise from 0.01% to 5%, preferably from 0.05% to 2%, and preferably from 0.1% to 0.5%, by weight of the polymer ( s) anionic (s) (PA1), and optionally anionic polymer (s) (PA2), in particular of carbomer (s), relative to the total weight of said emulsion. Cationic polymer The dispersed fatty phase comprises at least one cationic polymer (PC). Thus, the drops (G1), and in particular the bark of said drops (G1), or even optionally the bark of the drops (G2), further comprise at least one polymer of cationic type. They can also comprise several polymers of cationic type. This cationic polymer is the one mentioned above which forms the shell by coacervation with the anionic polymer. In the context of the present application, and unless otherwise stated, the term “cationic polymer” (or polymer of cationic type) means a polymer comprising chemical functions of cationic type. We can also speak of a cationic polyelectrolyte. Preferably, the cationic polymer (PC) is lipophilic or liposoluble. In the context of the present application, and unless otherwise stated, by chemical function of cationic type, is meant a chemical function B capable of picking up a proton to give a BIT function. Depending on the conditions of the medium in which it is found, the cationic type polymer therefore has chemical functions in B form, or else in BT form, its conjugated acid. As an example of chemical functions of cationic type, mention may be made of the primary, secondary and tertiary amine functions, optionally present in the form of ammonium cations. As an example of a cationic polymer, mention may be made of any polymer formed by the polymerization of monomers at least part of which carries chemical functions of cationic type, such as primary, secondary or tertiary amine functions. Such monomers are, for example, aziridine, or any ethylenically unsaturated monomer comprising at least one primary, secondary or tertiary amine function. Among the examples of cationic polymers suitable for implementing the invention, there may be mentioned amodimethicone, derived from a silicone polymer (polydimethylsiloxane, also called dimethicone), modified by primary amine and secondary amine functions. îo Mention may also be made of amodimethicone derivatives, such as for example copolymers of amodimethicone, aminopropyl dimethicone, and more generally linear or branched silicone polymers comprising amine functions. Mention may be made of the bis-isobutyl PEG-14 / amodimethicone copolymer, the Bis (C13-15 Alkoxy) PG-Amodimethicone, the Bis-Cetearyl Amodimethicone and the bishydroxy / methoxy amodimethicone. Mention may also be made of polymers of polysaccharide type comprising amine functions, such as chitosan or guar gum derivatives (hydroxypropyltrimonium guar chloride). Mention may also be made of polymers of the polypeptide type comprising amine functions, such as polylysine. Mention may also be made of polymers of polyethyleneimine type comprising amine functions, such as linear or branched polyethyleneimine. According to one embodiment, the drops, and in particular the shell of said 25 drops, comprise a cationic polymer which is a silicone polymer modified by a primary, secondary or tertiary amine function, such as amodimethicone. According to one embodiment, the drops, and in particular the bark of said drops, include amodimethicone. According to a particularly preferred embodiment, the cationic polymer (s) (PC) corresponds (s) to the following formula (I): NH 2 (I) in which: - Ri, R 2 and R 3 , independently of each other, represent OH or CH 3 ; - R 4 represents a group -CH 2 - or a group -X-NH- in which X is a divalent alkylene radical in C3 or C4; - x is an integer between 10 and 5000, preferably between 30 and 1000, and better still between 80 and 300; - y is an integer between 2 and 1000, preferably between 4 and 100, and better still between 5 and 20; and - z is an integer between 0 and 10, preferably between 0 and 1, and better is equal to 1. In the above formula (I), when R 4 represents a group -X-NH-, X is linked to the silicon atom. In the above formula (I), R 15 R 2 and R 3 preferably represent CH 3 . In the above formula (I), R 4 is preferably a group - (CH 2 ) 3 NH-. An amodimethicone is distinct / different from an oil such as those described above and capable of composing the fatty phase of the drops (G1) of an emulsion according to the invention. According to the invention, the emulsion can comprise from 0.01% to 10%, preferably from 0.05% to 5%, by weight of cationic polymer (s) (PC), in particular of amodimethicone ( s), relative to the total weight of the fatty phase of the drops (G1). Internal aqueous phase As indicated previously, the drops (G2) according to the invention comprise an internal aqueous phase. According to one embodiment, this aqueous phase has a viscosity between 0 mPa.s and 10,000 mPa.s, preferably between 0 mPa.s and 2,000 mPa.s, as measured at 25 ° C. This viscosity is measured according to the method described above. The internal aqueous phase of the dispersions comprises at least water. In addition to distilled or deionized water, water suitable for the invention can also be natural spring water or floral water. According to one embodiment, the mass percentage of water in the internal aqueous phase is at least 30%, preferably at least 40%, in particular at least 50%, and better still at least 60 %, especially between 70% and 98%, and preferably between 75% and 95%, relative to the total mass of said internal aqueous phase. According to a particular embodiment, the external continuous aqueous phase and / or the internal aqueous phase can (come) in the form of an oil-in-water emulsion, identical or different, said emulsion comprising a continuous aqueous phase and a fatty phase dispersed in the form of drops (G3), the size of the drops (G3) being less than 500 μm, preferably less than 400 μm, in particular less than 300 μm, better still less than 200 μm, in particular less than 100 pm, or even less than 20 pm, and better still less than 10 pm. Preferably, the size of the drops (G3) is between 0.1 and 200 pm, preferably between 0.25 and 100 pm, in particular between 0.5 pm and 50 pm, preferably between 1 pm and 20 pm, and better between 1 pm and 10 pm, or even between 3 pm and 5 pm. Optionally, the drops (G3) comprise a shell formed from at least one anionic polymer, identical or different from the anionic polymers (PA1) and / or (PA2), and from at least one cationic polymer, identical or different from the cationic polymer (PC) According to another particular embodiment, the fatty phase of the drops (G1) may be in the form of a water-in-oil emulsion, said emulsion comprising a continuous fatty phase and an aqueous phase dispersed in the form of drops (G4 ), the size of the drops (G4) being less than the drops (G1) and preferably less than the drops (G2). Preferably, the size of the drops (G4) is less than 500 μm, preferably less than 400 μm, in particular less than 300 μm, better still less than 200 μm, in particular less than 100 μm, or even less than 20 μm, and better less than 10 pm. Preferably, the size of the drops (G4) is between 0.1 and 200 pm, preferably between 0.25 and 100 pm, in particular between 0.5 pm and 50 pm, preferably between 1 pm and 20 pm, and better between 1 pm and 10 pm, or even between 3 pm and 5 pm. Optionally, the drops (G4) comprise a shell formed from at least one anionic polymer, identical or different to the anionic polymer (PA1), and at least one cationic polymer, identical or different from the cationic polymer (FC). Advantageously, the drops (G3) and / or (G4) are not macroscopic, that is to say not visible to the naked eye. îo In other words, the drops (G3) and / or (G4) are different and independent of the drops (G1) and (G2). Furthermore, when the drops (G3) are present at the level of the internal aqueous phase, the size of the drops (G3) is smaller than the size of the drops (G2). These drops (G3) and / or (G4) of reduced size make it possible to have an effect on the texture. In fact, an emulsion according to the invention comprising such finely dispersed drops (G3) and / or (G4) has even improved smoothness qualities. The presence of the drops (G3) and / or (G4) reinforces the characteristics of an emulsion according to the invention in terms of unique texture, lightness and evolving sensory. More particularly, an emulsion according to the invention comprising drops (G3) and / or (G4) spread easily on the skin. The first moments of application are very watery with a marked brittle effect. Then, the feeling evolves towards an oily veil which fades to leave a light and hydrated skin. This texture is particularly advantageous and surprising for those skilled in the art in view of the absence of surfactants in these emulsions. Texture agent (s) Depending on the fluidity and / or the sensoriality and / or the texture of the emulsion according to the invention which it is desired to obtain, said emulsion, in particular the external aqueous phase and / or the internal aqueous phase, little (Fri) t further comprise at least one texture agent different from the cationic polymers, anionic polymers, oils and gelling agents described above. Of course, a person skilled in the art will take care to choose the possible texture agent (s) and / or their quantity (s) in such a way that the advantageous properties of an emulsion according to the invention are not or substantially not altered by the proposed addition. Advantageously, an emulsion according to the invention comprises from 0.01% to 50%, preferably from 0.05% to 30%, in particular from 0.1% to 15%, better still from 1% to 10%, and all particularly 2% to 5%, by weight of texture agent (s) relative to the total weight of said emulsion. In particular, when the external aqueous phase comprises at least one texturing agent, an emulsion according to the invention comprises from 0.01% to 50%, preferably from 0.05% to 30%, in particular from 0.1% at 15%, better still from 1% to 10%, and very particularly from 2% to 5%, by weight of texture agent (s) relative to the total weight of said external aqueous phase. In particular, when the internal aqueous phase comprises at least one texturing agent, an emulsion according to the invention comprises from 0.01% to 30%, preferably from 0.05% to 15%, and in particular from 0.1 % to 10%, by weight of texture agent (s) relative to the total weight of said internal aqueous phase. As hydrophilic texturing agents, that is to say soluble or dispersible in water, and therefore possibly being present in the external aqueous phase and / or the internal aqueous phase of an emulsion according to the invention, mention may be made of : - natural texture agents, in particular chosen from algae extracts, plant exudates, seed extracts, exudates from microorganisms, such as alkasealan (INCI: Alcaligenes Polysaccharides), and other natural agents, in particular hyaluronic acid, - semi-synthetic texture agents, in particular chosen from cellulose derivatives and modified starches, - synthetic texturing agents, in particular chosen from homopolymers of (meth) acrylic acid or one of their esters, copolymers of (meth) acrylic acid or one of their esters, AMPS copolymers (2-acrylamido- 2-methylpropane sulfonic acid), associative polymers, - the other texturing agents, in particular chosen from glycols, polyethylene glycols (sold under the name Carbowax), clays, silicas such as those sold under the names Aérosil® 90/130/150/200/300/380), in particular glycerine, propylene glycol, butylene glycol, pentethylene glycol, propanediol, methylpropanediol, hexanediol, and - their mixtures. By “associative polymer” within the meaning of the present invention is meant any amphiphilic polymer comprising in its structure at least one fatty chain and at least one hydrophilic portion; the associative polymers in accordance with the present invention can be anionic, cationic, nonionic or amphoteric; these are in particular those described in FR 2 999 921. Preferably, these are amphiphilic and anionic associative polymers and amphiphilic and nonionic associative polymers as described below. Preferably, the texturing agents of the aqueous phase are chosen from those which are resistant to electrolytes, and are in particular chosen from carrageenans; xanthan gum; carboxymethylcellulose; hydroxyethylcellulose; hydroxypropylcellulose; hydroxypropyl methylcellulose; methylcellulose; ethylcellulose; alkylhydroxyethylcelluloses; hydroxypropyl starch phosphate; the carbomers represented by those marketed under the names Carbopol Ultrez 10/30, Tego Carbomer 134/140/141, Aqupec HV-505, HV-505HC, HV-504, HV-501, HV-505E, HV-504E, HV- 501E, HV505ED, Ashland 941 carbomer, or Ashland 981 carbomer; acrylate copolymers, in particular those sold under the names Carbopol Aqua SF-1 Polymer or Carbopol Aqua SF-1 OS Polymer or Arkema Reostyl 67N; the acrylates / C10-C30 alkyl acrylate crosspolymers sold under the names Carbopol Ultrez 20/21, Tego Carbomer 341 ER, Tego Carbomer 750 HD, Tego Carbomer 841 SER, Aqupec HV-501 ER, HV-701EDR, HV-501 EM, SER W-150C or SER W-300C; sodium acrylates / beheneth-25 methacrylate crosspolymer; acrylates / acrylamide copolymers; AMPS Na / hydroxyethyl acrylate copolymers sold under the names Sepinov WEO or Sepinov EMT 10; acryloyl Dimethyltaurate / Sodium Acrylate / Dimethylacrylamide crosspolymers; PVP; acrylates / Steareth-20 Methacrylate Copolymer; Polyacrylate Crosspolymer-6; acrylates / ceteth-20 itaconate copolymer; polyurethanes, for example Steareth-100 / PEG-136 / HDI Copolymer marketed under the name RHEOLUXE® 811 by Elementis specialitis, in particular polyurethane polyethers such as PEG-240 / HDI COPOLYMER BIS-DECYLTETRADECETH-20 ETHER, in particular those marketed under the names Adeka Nol GT-700 / GT-730; polyurethane-39; cetyl hydroxyethylcellulose; polyethylene glycols; bentonite; glycerin; and their mixtures, and better are chosen from acrylate copolymers, in particular that marketed under the name Carbopol Aqua SF-1 Polymer or Carbopol Aqua SF-1 OS Polymer. These texturing agents, in addition to their property (s) of resistance to electrolytes, give an emulsion according to the invention comprising them improved stability and transparency. Additional compound (s) According to the invention, the internal aqueous phase and / or the external aqueous phase and / or the fatty phase may / may further comprise at least one additional compound different from the anionic and cationic polymers, the gelling agent, the texture agent and the aforementioned oils. An emulsion according to the invention, and in particular the internal aqueous phase and / or the external aqueous phase and / or the fatty phase of said emulsion, can thus also come as additional compound powders, flakes , coloring agents, in particular chosen from coloring agents, water-soluble or not, liposoluble or not, organic or inorganic, pigments, materials with optical effect, liquid crystals, and their mixtures, particulate agents insoluble in the fatty phase, emulsifying and / or non-emulsifying silicone elastomers, in particular as described in EP 2 353 577, preservatives, humectants, stabilizers, chelators, emollients, modifying agents chosen from agents of pH, of osmotic force and / or modifiers of refractive index, etc. or any additive usual cosmetics, and mixtures thereof. According to one embodiment, the internal aqueous phase and / or the external aqueous phase comprises at least one coloring agent as defined above. Preferably, the internal aqueous phase of the emulsions according to the invention comprises at least one dye. The emulsions according to the invention and in particular the internal aqueous phase and / or the external aqueous phase and / or the fatty phase of the emulsions, can also further comprise at least one active, in particular biological or cosmetic, preferably chosen from agents moisturizers, healing agents, depigmenting agents, UV filters, desquamating agents, antioxidant agents, active agents stimulating the synthesis of dermal and / or epidermal macromoleculars, dermodecontracting agents, antiperspirants, soothing agents, anti-aging, perfuming agents and their mixtures. Such assets are described in particular in FR 1,558,849. According to one embodiment, the compound (s) additional (s) and / or active (s), in particular a hydrophilic cosmetic active, added (s) in internal aqueous phase of an emulsion according to the invention, present (nt) preferably a LogP less than 1, in particular less than 0.5, better less than 0, or even between 0.5 and -2.5, and better still between 0 and -2.5. According to another embodiment, the additional compound (s) and / or active agent (s), in particular a lipophilic cosmetic active agent, added in the fatty phase of the drops (G1) of an emulsion according to the invention preferably presents (s) a LogP greater than 1, in particular greater than 2, better greater than 3, or even between 1 and 7, in particular between 1.5 and 5, and better still between 2 and 3, 5. The log P (called octanol / water partition coefficient of a molecule) gives an estimate of the hydrophobicity of the molecule considered and has the advantage of being referenced / tabulated and therefore of being easily accessible for most molecules. classics. In addition, the value of the log P (= log (K)) can be evaluated simply by means of molecular modeling software easily accessible on the internet such as for example on www.molispiration.com, www. vcclab. org / lab / alogps / start.html ... An experimental determination is possible by the following method: a precise quantity of the active ingredient is weighed and dissolved in one of the two phases of water or octanol. Two equivalent volumes of the 2 phases are then brought into contact with stirring. The concentrations of the active product in each of the two phases are then carried out after thermodynamic equilibrium of the system. This concentration measurement can for example be carried out by direct measurement of the absorbance, if the molecule absorbs light, or by liquid chromatography. This measurement is carried out for example at 22 ° C. The coefficient K is then determined experimentally by the ratio of the concentration of the active ingredient in octanol to that in water. According to one embodiment, an emulsion according to the invention is such that the fatty phase of the drops (G1) also comprises at least one lipophilic active (or liposoluble) and the internal aqueous phase also comprises at least one hydrophilic active (or water soluble). According to one embodiment, the emulsions of the invention comprise glycerin present in the internal aqueous phase and / or the external aqueous phase. Preferably, the emulsions of the invention comprise at least 5% by weight of glycerin relative to the total weight of said emulsions. Indeed, beyond the texture, the emulsions according to the invention provide another advantage compared to “conventional” emulsions because they allow the use of glycerin, which is moreover in high contents. They may in particular comprise glycerin in a content greater than or equal to 10%, greater than or equal to 20%, greater than or equal to 30%, greater than or equal to 40%, or even up to 50%, by weight, by relative to the total weight of the emulsions. According to a particular embodiment, an emulsion according to the invention is such that the fatty phase of the drops (G1) also comprises at least one coloring agent (C1) and the internal aqueous phase of the drops (G2) also comprises at least a coloring agent (C2), (C2) being different from (C1), in particular at the level of the color effect. Preferably, the coloring agents (C1) and (C2) are chosen from pigments, nacres and their mixtures. This embodiment is advantageous in that the color effect obtained during the application of an emulsion according to the invention on a keratin material is different from that manifested by said emulsion before application. Indeed, before application of the emulsion, and therefore before rupture of the drops (G1) and (G2), the mainly visible color effect, even the only visible color effect, is that manifested by the drops (G1). The application of an emulsion according to the invention to a keratin material leads (i) to reveal the color effect of the drops (G2) and therefore (ii) to a new and unexpected color effect resulting from the mixture of coloring agents (C1 ) and (C2). According to another particular embodiment, an emulsion according to the invention is such that the fatty phase of the drops (G1) further comprises at least one UV filter and the internal aqueous phase of the drops (G2) further comprises at least one active , in particular biological or cosmetic, different from the UV filter, and in particular an active ingredient sensitive (or unstable) to solar radiation and more particularly to UV. This embodiment is advantageous in that the presence of UV filters in the fatty phase of the drops (G1) makes it possible to protect the active agent present in the internal aqueous phase of the drops (G2) from the effects of solar radiation and in particular UV. Thus, the integrity of said asset can be preserved over longer periods of time. This is particularly interesting for active ingredients sensitive to solar radiation, such as for example B vitamins, vitamin C, dihydroxyacetone or DHA, EUK 134 (INCI name: Ethylbisiminomethylguaiacol manganese chloride), etc. Advantageously, when an emulsion according to the invention, in particular the fatty phase of the drops (G1), further comprises at least one perfuming agent, the external aqueous phase, or even also the internal aqueous phase, also comprises at least one polymer crosslinked or crosslinked copolymer different from the anionic polymer, in particular different from the carbomer (s) and / or crosslinked copolymer (s) acrylates / C 10-30 alkyl acrylate mentioned above, said crosslinked polymer or crosslinked copolymer comprising at least one unit derived from the polymerization of one of the monomers chosen from the group consisting of acrylic acid, methacrylic acid, alkyl acrylate comprising from 1 to 30 atoms. In the context of the invention, and unless otherwise stated, the term “crosslinked copolymer of methacrylic acid and of alkyl acrylate comprising from 1 to carbon atoms” means a crosslinked copolymer resulting from the polymerization of a monomer methacrylic acid and an alkyl acrylate monomer comprising from 1 to 4 carbon atoms. According to one embodiment, the crosslinked polymer or the crosslinked copolymer according to the invention, present in the continuous aqueous phase, is chosen from the group consisting of the following polymers or copolymers: Acrylates Copolymer, Acrylates crosspolymer-4, Acrylates crosspolymer-3, Polyacrylate-2 Crosspolymer and Polyacrylate-14 (INCI names). Among said polymers above, very particularly preferred according to the present invention, the products sold by the company LUBRIZOL under the trade names a (INCI name = Polyacrylate-2 Crosspolymer), Fixate Freestyle Polymer (INCI name = Acrylates crosspolymer-3) , Carbopol® Aqua SF1 (INCI name = Acrylates copolymer) and Carbopol® Aqua SF2 (INCI name = Acrylates crosspolymer-4), or the one sold by Croda Inc. under the trade name Volarest ™ FL. Preferably, the crosslinked polymer or the crosslinked copolymer is chosen from Carbopol® Aqua SF1 (name INCI = Acrylates copolymer) and Carbopol® Aqua SF2 (name INCI = Acrylates crosspolymer-4). According to one embodiment, the crosslinked copolymer is chosen from crosslinked copolymers of acrylic or methacrylic acid and of alkyl acrylates comprising from 1 to 4 carbon atoms. According to the invention, the emulsion may comprise from 0.1% to 10% by weight, preferably from 0.5% to 8% by weight, and preferably from 1% to 3% by weight of polymer (s) crosslinked (s) or copolymer (s) crosslinked (s) relative to the total weight of said emulsion. Also, when an emulsion according to the invention, in particular the fatty phase of the drops (G1), also comprises at least one perfuming agent, the external aqueous phase, or even the internal aqueous phase, can also comprise at least one buffer having a pKa of from 4.0 to 9.0, in particular chosen from the group consisting of phosphate buffers, 2- (N-morpholino) ethane sulfonic acid, 2-amino-2-hydroxymethyl-1, 3-propanediol, 2- (bis (2hydroxyethyl) amino) acetic acid, 4- (2-hydroxyethyl) -1-piperazine ethane sulfonic acid, sodium citrate and mixtures thereof, preferably 4- (2hydroxyethyl) -1-piperazine ethane sulfonic acid. Preferably, an emulsion according to the invention comprises from 0.1% to 10% by weight of buffer (s), preferably from 0.5% to 5% by weight, relative to the total weight of said emulsion. Of course, a person skilled in the art will take care to choose any optional compound (s) and / or active agent (s) mentioned above and / or their respective amounts so that the advantageous properties of the emulsion according to the invention are not or substantially not altered by the proposed addition. In particular, the nature and / or the quantity of the additional compound (s) and / or active (s) depends on the aqueous or fatty nature of the phase considered of the emulsion according to the invention . These adjustments fall within the competence of a person skilled in the art. Preparation process The present invention also relates to a process for preparing an emulsion as defined above, comprising the following steps: a) bringing an aqueous fluid FE1 into contact with an oily fluid Fl; b) the formation of a water-in-oil emulsion consisting of drops (G2), formed from the aqueous fluid FE1, dispersed in a fatty phase consisting of the fluid F1, and c) the formation of drops (G1), each drop (G1) consisting of at least one, preferably a single drop (G2), by contacting the water-in-oil emulsion obtained in step b) with an aqueous fluid FE2; in which : the aqueous fluid FE1 comprises at least water and optionally at least one anionic polymer (PA2), in particular a carbomer, the oily fluid F1 comprises at least one gelling agent and at least one cationic polymer (PC), in particular an amodimethicone, and optionally at least one oil, and - the aqueous fluid FE2 comprises at least water and at least one anionic polymer (PA1), in particular a carbomer, identical to or different from the anionic polymer (PA2). According to one embodiment, the steps b) and c) above can be simultaneous. An emulsion according to the invention is preferably obtained by means of a microfluidic process, that is to say by using a microfluidic device, in particular as described in WO 2012/120043. According to one embodiment, step c) above can also comprise the presence of an intermediate fluid miscible with the fluid F1, as described in WO 2012/120043. During the drop forming step (G1), this intermediate fluid is therefore present at the interface between the fluid F1 and the fluid FE2. This intermediate fluid is intended to form a film around the drop (G1) in formation at the level of the microfluidic device. The intermediate fluid differs from the fatty phase of the drops (G1) at least in that it is devoid of the cationic polymer. Thus, the intermediate fluid delays the diffusion of the cationic polymer (PC) present in the fluid F1 until the intermediate fluid has mixed with the fluid F1 and thus ensures the formation of very stable drops stabilized by a very fine bark without obstruction of the microfluidic device. In the case where the aqueous fluid FE1 also comprises at least one anionic polymer (PA2), step a) above can also further comprise the presence of an intermediate fluid miscible with the fluid F1, as described in WO 2012/120043. During the drop forming step (G2), this intermediate fluid is therefore present at the interface between the fluid F1 and the fluid FE1. This intermediate fluid is intended to form a film around the drop (G2) in formation at the level of the microfluidic device. Thus, the intermediate fluid delays the diffusion of the cationic polymer (PC) present in the fluid F1 until the intermediate fluid has mixed with the fluid F1 and thus ensures the formation of very stable drops (G2) stabilized by a bark. very fine without obstruction of the microfluidic device. According to another embodiment, a method according to the invention can also comprise a step d) of adding a solution for increasing the viscosity of the external aqueous phase, namely the fluid FE2. Preferably, the viscosity increasing solution is therefore aqueous. This viscosity increasing solution is typically added to the aqueous fluid FE2 after formation of the drops (G1) and (G2), step d) therefore being subsequent to step c). According to one embodiment, the viscosity increasing solution comprises a base, in particular an alkali hydroxide, such as sodium hydroxide. According to yet another embodiment, when the gelling agent present at the level of the oily fluid F1 is a heat-sensitive gelling agent as described above, the process for preparing an emulsion according to the invention may require the implementation at least fluid F1 at a temperature of 40 ° C to 150 ° C. Thus, according to this embodiment, at least the fluid F1, or even the aqueous fluid FE1, can be heated to a temperature of from 40 ° C. to 150 ° C. for the performance of step a ), or even steps b) and c), and, optionally, the fluid FE2, can be heated to a temperature of from 40 ° C. to 150 ° C. for carrying out step c). In the case where the process for preparing an emulsion according to the invention is a microfluidic process, the microfluidic device as such is advantageously heated to a temperature of from 40 ° C. to 150 ° C. Preferably, the heating temperature of the fluid F1, or even of the fluids FE1 and FE2, and the microfluidic device is comprised from 50 ° C to 100 ° C, preferably from 55 ° C to 90 ° C, in particular from 60 ° C at 80 ° C, and preferably from 65 ° C to 85 ° C. According to one embodiment, when the oily fluid F1 comprises from 5% to 15% by weight of gelling agent (s) thermosensitive (s) relative to the total weight of said oily fluid F1, said oily fluid F1 is preferably heated to a temperature of 65 ° C to 70 ° C. According to one embodiment, when the oily fluid F1 comprises from 15% to 99.99%, preferably from 15% to 40%, by weight of gelling agent (s) thermosensitive (s) relative to the weight total of said oily fluid F1, said oily fluid F1 is preferably heated to a temperature of 80 ° C to 90 ° C. Advantageously, the presence of a gelling agent in the oily fluid F1 makes it possible to dispense with the use of an intermediate fluid as described in application WO 2012/120043. In this, the process for preparing a dispersion according to the invention is simplified compared to the preparation process described in WO 2012/120043. Preferably, the microfluidic device implemented according to the invention îo comprises one or more of the following characteristics, taken according to all the technically possible combinations: - the outlets of the various conduits (or channels or channels) of the microfluidic device are preferably on the same horizontal axis, so that each drop (G1) and the associated internal drop (G2) are formed simultaneously (in others terms, the ends of the channels of the IF and the MF are placed at the same height to generate a single step of formation of drops). This embodiment is advantageous in that it makes it possible to control the number of drop (s) (G2) in each drop (G1), and in particular makes it possible to ensure the presence of a single drop (G2) in each drop (G1); - At the outlet of the microfluidic device, the different fluids used form a multi-component drop, according to a hydrodynamic mode called "dripping" (drip). uses Preferably, an emulsion according to the invention can be used directly, at the end of the aforementioned preparation processes, as a composition, in particular a cosmetic. A composition according to the invention, when prepared by means of a microfluidic process as described above, can also be used as a composition, in particular cosmetic, in particular after separation of the drops (G1) and redispersion of these in a second appropriate phase. The compositions according to the invention can in particular be used in the cosmetic field. They can comprise, in addition to the abovementioned ingredients, at least one physiologically acceptable medium. The term “physiologically acceptable medium” is intended to denote a medium which is particularly suitable for the application of a composition of the invention to keratin materials, in particular the skin, the lips, the nails, the eyelashes or the eyebrows, and preferably the skin. . The physiologically acceptable medium is generally adapted to the nature of the support on which the composition is to be applied, as well as to the appearance under which the composition is to be packaged. According to one embodiment, the physiologically acceptable medium is represented directly by the external aqueous phase as described above. îo According to one embodiment, the cosmetic compositions are used for making up and / or caring for keratin materials, in particular the skin. The cosmetic compositions according to the invention can be care, sun protection, cleansing (make-up removing), hygiene or make-up products for the skin. These compositions are therefore intended to be applied in particular to the skin. Thus, the present invention also relates to the non-therapeutic cosmetic use of a cosmetic composition mentioned above, as a make-up, hygiene, cleaning and / or care product for keratin materials, especially the skin. According to one embodiment, the compositions of the invention are in the form of a foundation, a makeup remover, a facial and / or body and / or hair treatment, an anti-treatment -age, a sunscreen, an oily skin treatment, a whitening treatment, a hydrating treatment, a BB cream, tinted cream or foundation, a face and / or body cleanser , shower gel or shampoo. A care composition according to the invention may in particular be a sunscreen composition, a care cream, a serum or a deodorant. The compositions according to the invention can be in various forms, in particular in the form of a cream, balm, lotion, serum, gel, gel gel or even mist. The present invention also relates to a non-therapeutic method of cosmetic treatment of a keratinous material, in particular of the skin, comprising at least one step of applying to said keratinous material at least one emulsion or a composition according to the invention. In particular, the present invention relates to a non-therapeutic method of cosmetic treatment of the skin, comprising a step of applying to the skin at least one emulsion or a composition according to the invention. The present invention also relates to the use of a water-in-oil-in-water emulsion, comprising an external continuous aqueous phase and, as dispersed phase, a water-in-oil emulsion in the form of drops (G1), each drop (G1) comprising a continuous fatty phase and at least one, preferably a single, drop (G2) comprising an internal aqueous phase, said drops (G1) and (G2) being as defined above, for encapsulating in at least one hydrophilic compound, in particular a hydrophilic cosmetic active and, optionally, at least one lipophilic compound, in particular a lipophilic cosmetic active. The terms "between ... and ...", "ranging from ... to ..." and "ranging from ... to ..." must be understood including limits, unless otherwise specified. The amounts of the ingredients appearing in the examples are expressed as a percentage by weight relative to the total weight of the emulsion, unless otherwise indicated. The examples which follow illustrate the present invention without limiting its scope. EXAMPLES Example 1: double emulsion according to the invention with a heat-sensitive gelling agent in the fatty phase of the drops (G1) Below, composition of the external aqueous phase (OF), fatty phase (MF) and internal aqueous phase (IF): Phase Trade name | Provider INCI name % w / w Phases OF EXTERNAL AQUEOUS GEL PHASE subtotal 100.00 Osmotic water / Aqua qs * Microcare PE THOR phenoxyethanol 0.93 Microcare PTG THOR Pentylenglycol 2.33 Glycerin codex (99%) INTERCHIMIE Glycerin 17.49 EDETA BD BASF Disodium EDTA 0.04 Tego carbomer 340 FD Evonik carbomer 0.09 Carbopol Ultrez 21 Polymer LUBRIZOL Acrylates / C10-30 Alkyl Acrylate Crosspolymer 0.20 Zemea propanediol DUPONT TALE AND LYLE propanediol 5.83 Butylene glycol INTERCHIMIE Butylen glycol 5.83 Sodium Hydroxide Pellets PRS codex PANREAC Sodium Hydroxide 0.01 MF OILY PHASE subtotal 100.00 DUB ININ Grade A STERAINERIEDUBOIS Isononyl Isononanoate 38.31 Rheopearl KL2 MYOSHI EUROPE Dextrin palmitate 20.00 DUB DPHCC STEARINERIEDUBOIS Dipentaerythrityl hexacaprylate / hexacaprate 38.27 Perfume Fragrance 3.24 CAS-3131 NUSIL amodimethicone 0.18 IF INTERNAL AQUEOUS GEL PHASE subtotal 100.00 Osmotic water / Aqua qs Microcare PE THOR phenoxyethanol 0.93 Microcare PTG THOR Pentylenglycol 2.33 Glycerin codex (99%) INTERCHIMIE Glycerin 17.49 EDETA BD BASF Disodium EDTA 0.04 Carbopol Ultrez 21 Polymer LUBRIZOL Acrylates / C10-30 Alkyl Acrylate Crosspolymer 0.20 Zemea propanediol DUPONT TATE AND LYLE propanediol 5.83 Butylene glycol INTERCHIMIE Butylen glycol 5.83 Sodium Hydroxide Pellets PRS codex PANREAC Sodium Hydroxide 0.01 Unicert Blue 05601 J Sensient Cl 42090 0.00078 *: Sufficient Quantity For. Below, composition of the sodium hydroxide solution (BF): BF Trade name Provider INCI name % w / w Osmotic water qs Sodium Hydroxide Pellets PRS codex PANREAC Sodium Hydroxide 0.42 Total 100.00 The preparation of each of the above phases falls within the general competence of the skilled person. The proportions of the different phases of the final emulsion (PF) are presented in the table below. % phases in PF IF 9.25% MF 9.25% OF 76.51% BF 4.99% - Experimental apparatus: The equipment necessary for the manufacture of the emulsion according to Example 1 is composed of: 4 syringe pumps (one for OF, MF, IF and BF), a syringe heater (for MF), a thermostatic bath, a device microfluidic (or nozzle) with 3 concentric channels with coaxial outputs with, from the most internal channel to the most external channel: - the first route is dedicated to the passage of the FI; - the second channel is dedicated to the passage of the MF; and - the third lane is dedicated to the passage of the OF. The nozzle as well as the pipe conveying the oily phase (MF) are placed in a thermostated bath heated to 85 ° C. The microfluidic device is also suitable for adding a sodium hydroxide solution (BF) after formation of the drops (G1) and (G2) in order to increase the viscosity of the OF. The flow rates, from the outermost path to the innermost path of the nozzle, considered for the different phases are as follows: - OF: 76.70 mL / hr, - MF: 10,190 mL / hr, - IF: 9.273 mL / hr, and - BF: 5,000 mL / hr. An emulsion according to Example 1 is particularly advantageous, on the one hand, in that it provides a particularly satisfactory encapsulation of hydrophilic compounds thanks to the drops (G2) but also of lipophilic compounds thanks to the drops (G1). In addition, the drops (G1) and (G2) are macroscopic and monodisperse and each drop (G1) comprises a single drop (G2). Thus, the emulsion is provided with a visual. What is more, the emulsion has an unprecedented texture in the field of double emulsions which, for obvious reasons, meets a continuous demand from consumers for this. Furthermore, an emulsion according to Example 1 is also particularly advantageous in terms of kinetic stability. Furthermore, the drops (G1) have satisfactory mechanical strength. Thus, an emulsion according to Example 1 can remain stable on a time scale greater than 3 months, or even greater than 6 months, at 25 ° C., despite the lack of bark in the drops (G2). Optionally, the IF described above can also comprise a cationic polymer (PA2), in particular the Carbomer Tego 340FD from EVONIK present at 0.10% by weight relative to the total weight of the IF. The presence of this cationic polymer (PA2) in IF is advantageous in that it makes it possible to further reinforce the kinetic stability of the emulsion according to the invention, in particular the mechanical resistance of the drops (G2). Alternatively, Rheopearl KL2 (INCI: Dextrin palmitate) can be replaced by Rheopearl MKL2 (INCI: Dextrin Myristate). The resulting oily phase (MF), and therefore the final emulsion obtained, has the advantage of having improved transparency. Also, the oily phase (MF) may also comprise at least one phenylated silicone oil (for example a phenyltrimethicone, and better still a diphenylsiloxyphenyltrimethicone (INCI: Diphenylsiloxy Phenyl Trimethicone)) which further improves the transparency of the drops (G1) comprising a gelling agent of the Rheopearl KL2 and / or Rheopearl MKL2 type, and therefore of improving the transparency of the final composition. Example 2: double emulsion according to the invention with a thixotropic gelling agent 5 in the fatty phase of the drops (G1) Below, composition of the external aqueous phase (OF), fatty phase (MF) and internal aqueous phase (IF): Phase Trade name Provider INCI name % w / w Phases OF EXTERNAL AQUEOUS GEL PHASE subtotal 100.00 Osmotic water / Aqua qs Microcare PE THOR phenoxyethanol 0.80 Microcare PTG THOR Pentylenglycol 2.00 Glycerin codex (99%) INTERCHIMIE Glycerin 20.00 EDETA BD BASF Disodium EDTA 0.04 Tego carbomer 340 FD Evonik carbomer 0.25 Sodium Hydroxide Pellets PRS codex / Sodium Hydroxide 0.11 MF OILY PHASE subtotal 100.00 Myritol 318 Friend Chemistry CAPRYLIC CAPRIC TRIGYLCERIDE 96.80 Aerosil R974 Azelis SILICA DIMETHYL SILYLATE 3.00 CAS-3131 NUSIL amodimethicone 0.20 IF INTERNAL AQUEOUS GEL PHASE subtotal 100.00 Osmotic water / Aqua qs Microcare PE THOR phenoxyethanol 0.80 Microcare emollient PTG THOR Pentylenglycol 2.00 EDETA BD BASF Glycerin 0.04 Glycerin Codex 99% Interchimie Disodium EDTA 20.00 Soda solution 10% / Acrylates / C10-30 Alkyl Acrylate Crosspolymer 0.11 Unicert Blue 05601-J 0.1% Sensient Cl 42090 0.45 The preparation of each of the above phases falls within the general competence of those skilled in the art. The proportions of the different phases of the final emulsion (PF) are presented in the table below. % phases in PF IF 3.57% MF 10.71% OF 85.71% - Experimental apparatus: The equipment necessary for the manufacture of the emulsion according to Example 2 is identical to that presented in Example 1, with the difference that Example 2 does not use the use of syringe heaters or thermostated bath. The flow rates considered for the different phases are as follows: -OF: 120 mL / hr, - MF: 15 mL / hr, and - IF: 5 mL / hr. An emulsion according to Example 2 is particularly advantageous, on the one hand, in that it provides a particularly satisfactory encapsulation of hydrophilic compounds thanks to the drops (G2) but also of lipophilic compounds thanks to the drops (G1) and, on the other hand, has a unique visual and texture in the field of double emulsions which, for obvious reasons, meets a continuous demand from consumers in this direction. Furthermore, an emulsion according to Example 2 is also particularly advantageous in terms of kinetic stability, since the drops (G1) have sufficient mechanical strength to remain intact on a time scale greater than 3 months, or even greater than 6 month, at 25 ° C. Optionally, the IF described above can also comprise a cationic polymer (PA2), in particular the Carbomer Tego 340FD from EVONIK present at 0.10% by weight relative to the weight of the IF. The presence of this cationic polymer (PA2) in IF is advantageous in that it makes it possible to further reinforce the kinetic stability of the emulsion according to the invention, in particular the mechanical resistance of the drops (G2).
权利要求:
Claims (22) [1" id="c-fr-0001] 1. Water-in-oil-in-water emulsion, comprising an external continuous aqueous phase and a water-in-oil emulsion in the form of drops (G1), each drop (G1) comprising a continuous fatty phase and at least one, preferably a single drop (G2) comprising an internal aqueous phase, said continuous fatty phase containing at least one gelling agent, said drops (G1) comprising a shell formed of at least one anionic polymer (PA1) and at least a cationic polymer (PC), and optionally said drops (G2) comprising a shell formed from at least one anionic polymer (PA2), identical to or different from (PA1), and from at least one cationic polymer (PC). [2" id="c-fr-0002] 2. Emulsion according to claim 1, in which the gelling agent is chosen from organic or mineral, polymeric or molecular lipophilic gelling agents; solid fatty substances at room temperature and pressure; and their mixtures. [3" id="c-fr-0003] 3. Emulsion according to claim 1 or 2, wherein the gelling agent is chosen from the group consisting of polyacrylates; esters of sugar / polysaccharide and fatty acid (s), in particular esters of dextrin and fatty acid (s), esters of inulin and fatty acid (s), esters of glycerol and d 'Fatty acids ; polyamides; and mixtures thereof, preferably esters of dextrin and fatty acid (s). [4" id="c-fr-0004] 4. Emulsion according to claim 3, in which the esters of dextrin and of fatty acid (s) are chosen from the group consisting of dextrin palmitates, dextrin myristates, dextrin palmitates / ethylhexanoates, and their mixtures. [5" id="c-fr-0005] 5. Emulsion according to any one of claims 1 to 2, in which the gelling agent is chosen from the group consisting of optionally modified clays, silicas, such as fumed silica optionally hydrophobically treated at the surface, and mixtures thereof, preferably the fumed silica optionally hydrophobic surface treated. [6" id="c-fr-0006] 6. Emulsion according to any one of claims 1 to 5, comprising 5 from 0.5% to 99.99%, preferably from 1% to 70%, in particular from 1.5% to 50%, better still from 2% to 40%, in particular from 2.5% to 30% , and preferably from 10% to 20%, by weight of gelling agent (s) relative to the total weight of the fatty phase of the drops (G1). io [7" id="c-fr-0007] 7. An emulsion according to any one of claims 1 to 6, in which the fatty phase of the drops (G1) comprises at least one oil chosen from the group consisting of hydrocarbon oils of plant origin, hydrocarbon oils of animal origin, synthetic esters and ethers, linear or branched hydrocarbons, of mineral or synthetic origin, oils of 15 silicone, fatty alcohols having from 8 to 26 carbon atoms, partially hydrocarbon-based and / or silicone fluorinated oils and their mixtures, preferably synthetic esters and ethers. [8" id="c-fr-0008] 8. Emulsion according to any one of claims 1 to 7, comprising 20 from 0% to 99.49%, preferably from 5% to 95%, in particular from 20% to 90%, better still from 30% to 80%, or even from 50% to 70%, by weight of oil ( s) relative to the total weight of the fatty phase of the drops (G1). [9" id="c-fr-0009] 9. Emulsion according to any one of claims 1 to 8, in which The anionic polymer (s) (PA1), and optionally the anionic polymer (s) (PA2), is / are polymers comprising monomeric units comprising at least one acid function carboxylic acid, preferably are selected from carbomers and crosslinked copolymers of acrylates / C 10 -30 alkyl acrylate. 30 [10" id="c-fr-0010] 10. Emulsion according to any one of claims 1 to 9, comprising from 0.01% to 5%, preferably from 0.05% to 2%, and better still from 0.1% to 0.5%, by weight anionic polymer (s) (PA1), and optionally anionic polymer (s) (PA2), in particular of carbomer (s), relative to the total weight of said emulsion. [11" id="c-fr-0011] 11. Emulsion according to any one of claims 1 to 10, in which the cationic polymer (PC) corresponds to the following formula (I): NH 2 in which: - Ri, R 2 and R 3 , independently of each other, represent OH or CH 3 ; - R4 represents a group -CH 2 - or a group -X-NH- in which X is a divalent alkylene radical in C3 or C4; - x is an integer between 10 and 5000; - y is an integer between 2 and 1000; and - z is an integer between 0 and 10. [12" id="c-fr-0012] 12. An emulsion according to any one of claims 1 to 11, comprising from 0.01% to 10%, preferably from 0.05% to 5%, by weight of cationic polymer (s) (PC), in particular amodimethicone (s), relative to the total weight of the fatty phase of the drops (G1). [13" id="c-fr-0013] 13. Emulsion according to any one of claims 1 to 12, in which the volume fraction p (IF / (IF + MF)) is between 0.1 and 0.7, preferably between 0.3 and 0.6 , and better between 0.4 and 0.5, where: IF represents the total volume of the drops (G2), and MF represents the total volume of the drops (G1). [14" id="c-fr-0014] 14. Emulsion according to any one of claims 1 to 13, in which the internal aqueous phase of the drops (G2) comprises at least one additional compound and / or an active, in particular a hydrophilic cosmetic active, preferably having a LogP lower than 1, in particular less than 0.5, better still less than 0, or even between 0.5 and -2.5, and better still between 0 and -2.5. [15" id="c-fr-0015] 15. Emulsion according to any one of claims 1 to 14, further comprising at least one active agent chosen from hydrating agents, healing agents, depigmenting agents, UV filters, desquamating agents, antioxidant agents, stimulating active agents the synthesis of dermal and / or epidermal macromoleculars, dermodecontracting agents, antiperspirant agents, soothing agents, anti-aging agents, perfuming agents and their mixtures. [16" id="c-fr-0016] 16. Emulsion according to any one of claims 1 to 15, in which the size of the drops (G1) is greater than 500 pm, or even greater than 1000 pm, and better still is between 500 pm and 3000 pm, preferably between 1000 pm and 2000 pm, in particular between 800 pm and 1500 pm and / or the size of the drops (G2) is greater than 10 pm, or even greater than 50 pm, and better still is between 10 pm and 2000 pm , in particular between 50 pm and 1500 pm, better between 100 pm and 1100 pm, preferably between 200 pm and 800 pm, and better between 300 pm and 700 pm. [17" id="c-fr-0017] 17. An emulsion according to any one of claims 1 to 16, said emulsion not comprising a surfactant. [18" id="c-fr-0018] 18. A method of preparing an emulsion according to any one of claims 1 to 17, comprising the following steps: a) bringing an aqueous fluid FE1 into contact with an oily fluid Fl; b) the formation of a water-in-oil emulsion consisting of drops (G2), formed from the aqueous fluid FE1, dispersed in a fatty phase consisting of the fluid F1, and c) the formation of drops (G1), each drop (G1) consisting of at least one, preferably a single drop (G2), by contacting the water-in-oil emulsion obtained in step b) with an aqueous fluid FE2; in which : the aqueous fluid FE1 comprises at least water and optionally at least one anionic polymer (PA2), in particular a carbomer, the oily fluid F1 comprises at least one gelling agent and at least one cationic polymer (PC), in particular an amodimethicone, and optionally at least one oil, and - the aqueous fluid FE2 comprises at least water and at least one anionic polymer (PA1), in particular a carbomer, identical to or different from the anionic polymer (PA2). [19" id="c-fr-0019] 19. The method of claim 18, wherein at least the fluid F1, or even the aqueous fluid FE1, is / are heated to a temperature of from 40 ° C to 150 ° C for carrying out step a) , or even steps b) and c) and, optionally, the fluid FE2 is heated to a temperature of from 40 ° C. to 150 ° C. for carrying out step c). [20" id="c-fr-0020] 20. Composition, in particular cosmetic, comprising at least one emulsion according to any one of claims 1 to 17 and a physiologically acceptable medium. [21" id="c-fr-0021] 21. Non-therapeutic method of cosmetic treatment of a keratinous material, in particular of the skin, comprising at least one step of applying to said keratinous material at least one emulsion according to any one of claims 1 to 14, 16 or 17 or at least one composition according to claim 20. [22" id="c-fr-0022] 22. Use of a water-in-oil-in-water emulsion, comprising an external continuous aqueous phase and a water-in-oil emulsion in the form of drops (G1), each drop (G1) comprising a continuous fatty phase and at least one, preferably a single drop, (G2) comprising an internal aqueous phase, said drops (G1) and (G2) being as defined in any one of claims 1 to 17, for encapsulating at least one hydrophilic compound , in particular a hydrophilic cosmetic active and, optionally, at least one lipophilic compound, in particular a lipophilic cosmetic active.
类似技术:
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同族专利:
公开号 | 公开日 CN110087732A|2019-08-02| FR3057768B1|2018-12-07| WO2018077977A1|2018-05-03| US20190254941A1|2019-08-22|
引用文献:
公开号 | 申请日 | 公开日 | 申请人 | 专利标题 EP0614660A1|1993-03-11|1994-09-14|Roussel Uclaf|Multiple emulsions, their preparation, their application in the preparation of cosmetic compositions and cosmetics compositions containing them| WO2003049847A1|2001-12-11|2003-06-19|Rhodia Chimie|Multiple emulsion comprising a gelled internal oil phase| FR2972367A1|2011-03-08|2012-09-14|Capsum|Oil in water emulsion, useful for preparing cosmetic composition, comprises aqueous phase dispersed in continuous oil phase, where the aqueous phase comprises droplets and the oil phase comprises an oil composition| US20150272861A1|2014-03-28|2015-10-01|Nusil Technology Llc|Dispersions containing encapsulated materials and compositions using same| WO2016096995A1|2014-12-16|2016-06-23|Capsum|Stable dispersions containing drops of perfuming agent| DE1266254B|1967-09-19|1968-04-18|Spodig Heinrich|Permanent magnet separator| JP2796990B2|1989-05-10|1998-09-10|株式会社資生堂|Skin cosmetics| US5919441A|1996-04-01|1999-07-06|Colgate-Palmolive Company|Cosmetic composition containing thickening agent of siloxane polymer with hydrogen-bonding groups| US5783657A|1996-10-18|1998-07-21|Union Camp Corporation|Ester-terminated polyamides of polymerized fatty acids useful in formulating transparent gels in low polarity liquids| US5874069A|1997-01-24|1999-02-23|Colgate-Palmolive Company|Cosmetic composition containing silicon-modified amides as thickening agents and method of forming same| US6051216A|1997-08-01|2000-04-18|Colgate-Palmolive Company|Cosmetic composition containing siloxane based polyamides as thickening agents| US5981680A|1998-07-13|1999-11-09|Dow Corning Corporation|Method of making siloxane-based polyamides| FR2792190B1|1999-04-16|2001-09-28|Sophim|PROCESS FOR THE MANUFACTURE OF A NON-FATTY EMOLLIENT BASED ON WAX-ESTERS| DE60140764D1|2000-12-12|2010-01-21|Oreal|COSMETIC COMPOSITION CONTAINING A POLYMER AND FIBERS| WO2002056847A1|2001-01-17|2002-07-25|L'oreal|Cosmetic composition comprising a polymer and a fluorinated oil| FR2939012B1|2008-12-01|2015-03-27|Capsum|PROCESS FOR MANUFACTURING A SERIES OF CAPSULES, AND ASSOCIATED SERIES OF CAPSULES| FR2954104B1|2009-12-18|2012-03-09|Oreal|W / O EMULSION COMPRISING EMULSIFYING SILICONE ELASTOMER AND VOLATILE LINEAR ALKANE| BR112013022027A2|2011-03-08|2016-11-29|Capsum|process of forming first phase droplets dispersed in a second phase substantially immiscible with the first phase| FR2987741B1|2012-03-08|2014-04-18|Capsum|KIT COMPRISING TWO SEPARATE COMPOSITIONS, IN PARTICULAR FOR A COSMETIC APPLICATION| FR2987740B1|2012-03-08|2014-04-18|Capsum|DISPERSION FOR ENCAPSULATING AN ACTIVE PRODUCT AND USE THEREOF| FR2999921B1|2012-12-20|2015-04-03|Oreal|AQUEOUS COSMETIC COMPOSITION COMPRISING ALKYLCELLULOSE.| FR3012050B1|2013-10-17|2016-01-01|Capsum|METHOD OF FORMING A DISPERSION COMPRISING DROPS, AND APPARATUS THEREFOR|CN112888428A|2018-08-17|2021-06-01|克里兹托夫·斯梅拉|Nanocoapsular nanocapsule-in-nanocapsule type multicompartment system encapsulating lipophilic and hydrophilic compounds and related production method| FR3090330B1|2018-12-20|2020-12-04|Oreal|Aqueous composition comprising capsules based on gelled oil containing an active agent sensitive to oxygen| FR3110405A1|2020-05-21|2021-11-26|Capsum|Double stable emulsion without bark|
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2017-07-20| PLFP| Fee payment|Year of fee payment: 2 | 2018-04-27| PLSC| Search report ready|Effective date: 20180427 | 2018-09-24| PLFP| Fee payment|Year of fee payment: 3 | 2019-10-07| PLFP| Fee payment|Year of fee payment: 4 | 2020-09-10| PLFP| Fee payment|Year of fee payment: 5 | 2021-09-10| PLFP| Fee payment|Year of fee payment: 6 |
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申请号 | 申请日 | 专利标题 FR1660386A|FR3057768B1|2016-10-26|2016-10-26|DOUBLE EMULSIONS COMPRISING A GELIFIED FAT PHASE| FR1660386|2016-10-26|FR1660386A| FR3057768B1|2016-10-26|2016-10-26|DOUBLE EMULSIONS COMPRISING A GELIFIED FAT PHASE| PCT/EP2017/077356| WO2018077977A1|2016-10-26|2017-10-25|Double emulsions comprising a gelled fatty phase| CN201780078152.5A| CN110087732A|2016-10-26|2017-10-25|Double lotions comprising gelatine fat phase| US16/344,371| US20190254941A1|2016-10-26|2017-10-25|Double emulsions comprising a gelled fatty phase| 相关专利
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