• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a coating composition for paper or board with a dry matter content between 45 and 80%, comprising i) binders including at least one modified starch and an adhesive ii) a hydrolyzed wheat protein with an average molecular weight between 7 and 1000 kDa , and iii) a mineral filler as well as the method for obtaining such a composition. The invention also relates to a method for coating or blue coloring paper or paperboard, comprising the steps of i) providing a composition according to the invention and ii) depositing the composition on a substrate of paper or paperboard and the coated paper or cardboard. Finally, the invention relates to the use of a hydrolyzed wheat protein in the replacement of the latex in a coating composition for paper or cardboard.
    公开号:BE1023282B1
    申请号:E2016/5128
    申请日:2016-02-23
    公开日:2017-01-20
    发明作者:Magalie Peralba；Vittorio Rivolta；Sofie Frederix
    申请人:Syral Belgium Nv；
    IPC主号:
    专利说明:

    Coating composition comprising hydrolysed wheat proteins Technical domain
    The present invention relates to a coating composition for paper or cardboard comprising a modified starch and a hydrolyzed wheat protein as well as the method for obtaining such a composition. The invention also relates to a method for coating or blue coloring paper or board using such a composition, the coated paper or board obtained therewith. The invention finally relates to the use of a hydrolysed wheat protein in the replacement of the latex in a coating composition for paper or cardboard.
    State of the art
    The coating, also called coating, is a finishing step of the paper or cardboard, which serves to impart a number of properties to a sheet of paper or cardboard, such as opacity, gloss, whiteness or improving printability in printing methods such as offset or gravure. During this coating step, a composition called coating is applied to the surface of the paper or cardboard. This composition generally comprises at least one mineral filler or pigmentary filler, at least one binder and other additives such as, in particular, dispersants, rheology modifiers, lubricants, optical brighteners or antifoaming agents.
    The paper industry uses various chemical products such as surfactants, optical brighteners, water-resistant agents (ketone resin, anionic latex ...) to give the paper different properties or to simplify the manufacturing process. The latex, typically synthetic styrene butadiene-type latex, is the most commonly used binder. It has the function of allowing the cohesion between the various components of the composition and binding them to the fibers. The synthetic latex is produced from oil stocks that are by definition non-renewable. To reduce the number of chemicals used in this industry, to reduce the consumption of petroleum derivatives and to reduce costs, the replacement of latex in coatings represents a potential market, but also a technical challenge. Indeed, it is very difficult to maintain the performance of a coating when reducing the proportion of synthetic latex used.
    Many pistes have been tested, including the use of soy proteins (US 2006/174801). Now, these products have led to the production of highly viscous coatings or to be used at very low dry matter levels (in the order of 38-44% DS) to compensate for the viscosity or to ensure the solubility of these products.
    The state of the art also describes the use of cold-soluble starch; in such compositions one can also quote, for example, the international patent application WO 08/104574. However, these starches tend to form aggregates during dissolution, they also require the use of high shear mixers with which most paper manufacturers are not equipped.
    Furthermore, it should be noted that the coatings are intended to be applied to the surface of the paper or board in very thin layers at very high speed. They are applied by means of a sheet or a threaded rod which exerts very high shear forces on the surface of the paper. So with non-homogeneous or excessive viscosity, these shear forces not only lead to turbulences responsible for errors in the deposit called "drooling" or "beads" at the level of the area of application, but also to an increase in pressure exerted on the paper which increases the risk of breakage and possible hours of production cessation.
    To solve this technical problem, the prior art proposes coating compositions with a low dry matter content. The reduction in the dry matter of the composition (and consequently the increase in water content) in order to lower the viscosity is not an advantageous solution in the present application. Indeed, the coating has a natural tendency to transfer water to the sheet of paper or a portion thereof and the water-soluble parts it contains. This has several consequences, the first being the weakening of the paper or the cardboard, which can lose its integrity due to the excess water and can lead to a paper product break and therefore possible production cessation. The second is the gloss loss of the paper observed after the migration of water-soluble portions of the coating onto the paper. This migration causes a third consequence which is the weakening of the cohesion of the paper, which causes printing problems. Reference may be made, for example, to the pouring of fibers or mineral fillers from the layer onto the blankets during offset printing. The final consequence of this excess water from the coating composition is the increase in energy and / or the time required for drying the resulting paper or cardboard.
    Moreover, the advantage of a coating with both a high dry matter content and a low viscosity after the disappearance of the above-mentioned problems is the low necessary deposit of the coating. Moreover, a coating of low viscosity would also have the advantage of allowing a coating at high speeds, which offers a clear industrial advantage.
    Moreover, with the predetermined pistes in the replacement of latex, it does not allow any improvement and at least the preservation of the resilience against tearing of the paper or cardboard obtained. The strong tear resistance guarantees the preservation of the integrity of the paper or cardboard when a force is exerted on the surface and therefore a wider use of the latter. This property is essential, especially when offset printing paper is exposed to high voltages at the output of the ink rollers. Indeed, at this stage, the ink film splits into two parts, one still on the paper and the other on the blanket. During this separation, a normal force is applied to the paper leading to the tearing of the particles (fibers or mineral fillers) that are poorly connected to each other or to the paper and their deposit on the blankets. This phenomenon is responsible for contamination of the blankets and can oblige the printer to stop the production for cleaning.
    Thus, there is currently no coating composition with both a latex reduced content than what is described in the prior art, a very high solids content and low viscosity, while a strong tear resistance imparting to the paper or cardboard.
    It is therefore the object of the present invention to offer a coating that meets the needs of the prior art.
    Detailed description of the invention
    The invention relates to a coating composition for paper or cardboard with a dry substance content between 45 and 80%, preferably 50 and 78%, even more preferably 55 to 75%, comprising: binders including at least one modified starch and an adhesive at preferably synthetic, • a hydrolysed wheat protein with an average molecular weight between 7 and 100,000 and • a mineral filler
    By "coating composition for paper or cardboard" is meant a composition that is particularly suitable for coating paper or cardboard. It is an aqueous formulation comprising classic water, at least one mineral filler, one or more binders as well as various additives.
    Typically, the composition according to the invention comprises per 100 parts by weight of mineral filler: 1 to 99 parts of binders, preferably 1 to 50 parts, even more preferably 1 to 15 parts, and 1 to 50 parts by weight of wheat protein, preferably 1 to 20 parts, even more preferably 1 to 8 parts,
    The term "wheat protein" refers to a protein fraction insoluble in water, wet extracted from wheat flour and subsequently dried, also called wheat gluten. Typically, wheat proteins with an average molecular weight between 7 and 100,000 are obtained by hydrolysis according to methods well known to those skilled in the art [Anfinsen, C.B. Jr. (1965) Advances inprotein chemistry: v.20. New York and London: Academic Press], Typically the hydrolysis can be thermal, acidic or enzymatic. The enzymatic hydrolysis is preferred.
    A wheat gluten particularly suitable for the present invention is the SOLPRO® 508 commercialized by TEREOS SYRAL.
    Typically, the hydrolyzed wheat protein according to the invention has an average molecular weight between 7 and 800 kDa, 5 and 500 kDa or 8 and 100 kDa, preferably between 9 and 80 kDa, even more preferably between 10 and 70 kDa, even more preferably between 12 and 50 kDa, even more preferred between 13 and 40 kDa.
    By "binder" is meant a compound with a function to join the mineral filler particles (or pigments) together and to maintain the layer on the surface of the paper.
    According to the invention, the composition comprises a binder / wheat protein ratio of 1: 5 to 5: 1, preferably 1: 3 to 3: 1, even more preferably 1: 2 to 2: 1.
    According to the present invention, the binders are at least one modified starch and an adhesive such as a synthetic adhesive. Typically in a ratio modified starch / synthetic adhesive from 1: 5 to 5: 1, preferably from 1: 3 to 3: 1, even more preferably 1: 2 to 2: 1.
    By modified starch is meant, in the context of the present invention, any starch that has been chemically or physically treated.
    The molecules of modified starches present in the present invention can be obtained from a vegetable source such as grains, tubers, roots, vegetables, and fruits. For example, the starch or starches may come from a vegetable source selected from corn, peas, potato, sweet potato, banana, barley, wheat, rice, oats, sago, tapioca and sorghum.
    More specifically, the modification reactions can be carried out by, for example: • by pre-gelatinization via cleavage of the starch granules (such as drying and drying in a tumble dryer); • by acid hydrolysis using, for example, strong acids or by enzymatic hydrolysis, • by oxidation using, for example, strong oxidizing agents leading to the introduction of carboxyl groups in the starch molecule and depolymerization of the starch molecule (for example, by treatment of an aqueous solution of starch sodium hypochlorite); By crosslinking with functional agents that can react with the hydroxyl groups of the starch molecules, which are thus coupled together (for example with glyceryl groups and / or phosphate groups); for example, phosphorus compounds are obtained from mono-starch phosphates (type Am-O-PO (OX) 2), the di-starch phosphates (type Am-O-PO (OX) -Ο-Am) or even tri-starch (type Am-O-PO- (0 -Am) 2) or their mixtures. X refers, for example, to alkali or alkaline earth metals, • by esterification in an alkaline medium for grafting functional groups, in particular C1 -C6 acyl (acetyl), C1 -C6 hydroxyalkyls (hydroxyethyl, hydroxypropyl) carboxymethyl, octenyl succinate. It is particularly possible to mention starches modified with sodium carboxymethyl; • by dextrinization such as, for example, by treatment of a natural starch in the dry phase, by the action of heat in a dry or dry environment, whether or not in the presence of a chemical agent, or by the action of heat or a combination of these different agents . For most, which are discontinuous or continuous, these processes use transformation temperatures above 80 ° C and the possible presence of an acid, an alkaline agent and / or an oxidizing agent.
    Suitable modified starches include, but are not limited to, pregelatinized starches, low viscosity starches (e.g., dextrins, hydrolyzed starches, oxidized starches), stabilized starches (e.g., starch esters, starch ethers), crosslinked starches, and starches that have received a combination of treatments (e.g., cross-linking and gelatinization) and their mixtures.
    Dextrins are the preferred modified starches. By "dextrin" within the meaning of the present invention is meant a modified starch obtained from a natural starch by dextrinization, typically the dextrins of the invention are not subject to any further modification, in particular chemical. The dextrins adapted to the present invention are, for example, white dextrins, generally obtained by transforming starch at temperatures often between 100 and 170 ° C, in the presence of (a) chemical (s), in particular acid, in relatively large quantities. The yellow dextrins, often obtained by transforming starch at high temperatures, typically between 170 and 230 ° C, in the presence of chemical agent (s), in particular acid. Finally, dextrins called "British gum" obtained by the action of only heat at elevated temperature, often above 230 ° C. A dextrin particularly suitable for the present invention is a wheat dextrin, typically the dextrin MYLOFILM® 214 or MYLOFILM® 218 commercialized by the company TEREOS SYRAL.
    Typically, in the context of the present invention, particularly suitable modified starch has a molecular weight between 20 and 300 kDa, preferably 30-250 kDa, more preferably between 35 and 233 kDa, even more preferably between 40 and 200KDa, even more preferably between 42 and 150 kDa and / or a viscosity between 50 and 400 mPa.s (Brookfield, 70 ° C, 31% DS). Measurement with a Brookfield viscometer of the modified starch such as, for example, of a dextrin solution is performed on a model RVDV-E, the measurement is performed at a speed of 20 rpm with the spindle 3. The measurements are performed at 70 ° C. The module is soaked in a composition of modified starch suspension with 31% dry matter to the bar indicator of the spindle, the value is read value after 10s of revolutions.
    By "average molecular weight" is meant the molecular weight average in weight.
    In the context of the hydrolysed protein, that average molecular weight is measured by steric exclusion chromatography (SE-HPLC) coupled with a UV detector set to a wavelength of 214 nm. The steric exclusion chromatography is provided with a pump circulating an eluent consisting of a PBS phosphate buffer (0.1 M Na 2 HPO 4 -NaH 2 PO 4 with 0.1% SDS) at a flow rate of 0.7 ml / min in a TSKG4000SWx1 column. This measurement is expressed in Dalton. The preparation of a sample can be carried out by dissolving the product in an extraction phosphate buffer with 1% SDS followed by centrifugation to recover the supernatant.
    In the context of the modified starch and more particularly dextrin, the average molecular weight is expressed in Dalton and can be determined by the person skilled in the art by steric exclusion chromatography coupled to a MALLS (Multi Angle Laser Light Scattering) type detector. The preparation of a sample can be carried out by dissolving 50 mg in dry weight of a modified starch and in particular dextrin in a solvent consisting of a mixture of 90% (v / v) DMSO (dimethylsulfoxide) in the deionized water containing 0 1% (m / v) sodium nitrate. After stirring overnight, the mixture is preheated for 1 hour at 105 ° C and then centrifuged for 15 minutes at 5,300 g. A 100 ml volume of the supernatant is injected into a steric exclusion chromatography apparatus where the mobile phase is, for example, composed of a mixture of 90% (v / v) DMSO (dimethyl sulfoxide) in deionized water containing 0.1% (m / v) sodium nitrate, with a flow rate of 0.5 ml / min and a temperature of 70 ° C, the columns used are preferably a series connection of gram columns. The detector is, for example, an angle laser such as the New Generation 3-angle miniDAWN TREOS. The calibration is done with standards of the Viscotec P82 Shodex type. In the context of the present invention, the adhesive is preferably synthetic. An example of a synthetic adhesive suitable for the present invention is a latex, a vinyl acetate, polyvinyl alcohol, sodium carboxymethyl cellulose, and hydroxy ethyl cellulose.
    The term "latex" refers to an aqueous polymer dispersion corresponding to a colloidal dispersion of synthetic polymers in an aqueous phase, i.e., a dispersion of microparticles of polymers in suspension in an aqueous phase, also called suspension or polymer emulsion. Examples of latex suitable for the present invention are selected from the group consisting of styrene butadiene latex, polyvinyl alcohol latex and acrylic copolymer latexes, preferably the styrene butadiene type latex.
    Generally in the coating, the mineral filler is introduced and transported in the form of an aqueous suspension. Classically, this filler is a calcium carbonate suspended in water with the help of a dispersant. Typically, a mineral filler particularly suitable for a coating composition comprises a sufficient amount of whiteness (more than 80% of the whiteness of barium sulfate at 457 nm), a particle size distribution of 0-10 µm maximum, (the average particle size is between 0.2 and 2 µm) and a minimal agglomeration of the particles. For example, the mineral filler can be selected from the group consisting of calcium carbonate, clay coating, finely calcined clay, alumina trihydrate, talc and titanium dioxide.
    The term "calcium carbonate" includes the ground calcium carbonate (GCC), that is, a calcium carbonate obtained from natural sources such as limestone, marble, calcite or lime. The term "calcium carbonate" also includes precipitated calcium carbonate (PCC), that is, a composite material, generally obtained by precipitation after a reaction of carbon dioxide and calcium hydroxide (hydrated lime) in an aqueous medium or by precipitation of a source of calcium and carbonate in water.
    The composition according to the invention may also comprise other agents such as one or more dispersants. By "dispersing agent" is meant an agent comprising the function of keeping the mineral filler particles in a state of electrostatic dispersion. For example, the dispersant is selected from the group consisting of sodium polyacrylate, tetrasodium polyphosphate, tetrasodium pyrophosphate, pentasodium tripolyphosphate, tetrasodium phosphate, and sodium silicate.
    The composition may also comprise at least one lubricant, in particular selected from the group consisting of sodium stearate, calcium stearate, sulfonated oils, sulfated tallol oil and polyethylene emulsions.
    The composition may comprise at least one insoluble agent selected from the group consisting of urea resins, melamine resins, glyoxal, zinc compounds, formaldehyde and dimethylol.
    The invention also relates to a method for preparing the composition according to the invention, comprising the following steps: - mixture with stirring of a mineral filler and binders, including at least one modified starch, preferably a dextrin and adhesive, preferably synthetic, preferably synthetic said modified starch has undergone a b step, - Added to stirring the mixture obtained from a hydrolysed wheat protein wheat with an average molecular weight between 7 and 100,000, preferably, said hydrolysed wheat protein is in powder form, - addition of water with stirring to obtain a composition with a dry matter content between 45 and 80%, optionally, the addition of water takes place with the mineral filler and / or the modified starch and / or the hydrolysed protein. Typically during the production process of the composition of the invention, the modified starch such as in particular a dextrin can be dissolved in water, and preferably subjected to a baking step prior to mixing with the adhesive. Independently, the mineral filler can be dissolved in the water before it is mixed with the binders.
    The invention also relates to a method for coating or blue coloring paper or cardboard, said method comprising the steps of (a) providing a composition according to the invention, (b) depositing said composition on a paper or cardboard substrate.
    The step of depositing the composition on a paper or cardboard substrate can take place with the aid of a coating sheet, a coating pencil, a threaded rod, a curtain coating glue press or film press or any other technique known to the person skilled in the art. Typically, the depositing step is carried out at a temperature between 25 and 60 ° C.
    Typically, said composition is applied to at least one side of said paper or cardboard substrate in an amount between 3 g / m2 and 15 g / m2, preferably between 5 g / m2 and 10 g / m2.
    The invention also relates to a paper or cardboard coated with the composition according to the invention.
    The invention further relates to the use of a hydrolyzed wheat protein in the replacement of the latex in a paper or cardboard coating composition, preferably said hydrolyzed wheat protein has an average molecular weight between 7 and 100,000.
    The invention relates to the use of a combination of a hydrolysed wheat protein and a modified starch and in particular a dextrin in the replacement of the latex, preferably in a modified starch / wheat protein ratio of 1: 5 to 5 : 1, preferably 1: 3 to 3: 1, more preferably 1: 2 to 2: 1.
    Typically, said wheat protein or said wheat protein combination with a modified starch, preferably a dextrin is used in the replacement of 1 to 40% of the latex of said composition, preferably 10 to 35%, more preferably up to 30%.
    Although they have different meanings, the terms "comprising", "containing", "having" and "consisting of" are used interchangeably in the description of the invention and may be interchanged.
    The invention will be better understood by reading the following examples, which are given for illustrative purposes only.
    Examples
    Example 1: Replacement of latex with a modified starch
    Creation of coatinss:
    The preliminary tests have shown that the best results are obtained with more than 45% dry matter (processability and energy performance). A significant improvement has been observed from 60%. Indeed, an increase in paper breakage has been observed when the paper coating is diluted (less than 45% DS). In addition, there was an increase in drying time below 60 and even more below 45%, which appears to be the lowest acceptable dry matter content. The paper undergoes a drying step after the coating, the excess water in the coating leads to an increase in the drying time and thus the production costs. That is why tests with coatings with a solid content of 70% were aimed for.
    A coating was carried out according to the formulas R1 to R4 in the Table 1 below.
    Table 1: coating compositions comprising dextrin as a partial replacement of latex
    The recipes are given in the number of parts (as usual in the paper industry).
    The dextrin (MYLOFILM® 214) is a wheat based dextrin (Mw = 47 kDa, Pd = 11, 6), commercialized by TEREOS SYRAL. It is firstly baked in a concentration of 35% dry matter in a continuous pressure cooker or "jet cooker" (Temp = 130 ° C, residence time: 3 minutes), then diluted to 31%.
    The coating is realized by an agitator (type IKA) first by suspending calcium carbonate in water at 79.7% (90 HYDROCARB® supplied by OMY). The synthetic binder (styrene-butadiene latex DL930 from STYRON) and dextrin in solution as described above are then added to the calcium carbonate. The concentration is adjusted with water to obtain a dry matter content of 70%. The stirring speed is set at 1500 rpm, the pH is then set at 9. The coating is stirred well for 10 minutes.
    The coatings from Table 1 were tested in coating tests.
    The viscosity of the coating is evaluated prior to coating the paper.
    Viscosity brookfield
    The measurement of the coating on the Brookfield viscosity meter is performed on an RVDV-E model, the measurement is performed at a speed of 20 rpm with the spindle 3. The measurements are performed at 40 ° C. The module is soaked in the coating until the line indicator of the spindle, the value is read after 10s of revolution.
    Coatin2 of paper
    The coating is deposited on paper up to 6 g / m2 on one side with a sleeping driver DT coater leaf coating that allows a combination of infrared radiation and hot air to dry. The coating speed is 20 m / min.
    The paper used is a fine 80 g / m2 paper supplied by FEDRIGONI.
    The coated paper is then stored in a conditioned room in humidity and temperature (50% humidity, 23 ° C) for 24 hours before taking measurements.
    Tear resistance IGT droos
    The dry tear resistance measurement is carried out according to the method of IGT W31 (ISO 3783: 2006). This measure makes it possible to assess the strength of the coating. Indeed, the binders (synthetic or natural such as starch) are used to preserve the necessary mineral fillers from printing properties on the paper. If the binding force is too low, the mineral fillers are peeled off the paper when printing and depositing on the ink roll, causing frequent stops. Furthermore, the measurement of dry IGT is important as the coating is more resistant to tearing.
    Results
    The analysis of the characteristics of the obtained paper has contributed to show that the replacement of the latex with the dextrin in solution causes a loss of tear resistance properties (Table 2).
    Table 2 Brookfield Viscosity of coating R1 to R4 and tear requirements of the resulting paper.
    Indeed, the replacement of latex by only dextrin does not allow the retention of the coating properties and therefore leads to a net decrease in the tear resistance properties of the coating. For example, only dextrin does not allow the reduction of the latex in the coating to be compensated.
    Example 2: Replacement of the latex with soy proteins or hydrolysed wheat proteins
    The use of vegetable proteins to replace latex was evaluated. After various tests, it has been found that the addition of proteins in addition to dextrin makes it possible to observe better results in the replacement of the latex observed with only dextrin, especially with regard to the dry tear resistance properties of the resulting composition. This effect has only been observed for hydrolysed proteins, not for the natural proteins. Thus, due to its reduced solubility, the non-hydrolyzed wheat gluten does not allow for obtaining uniform coatings and acceptable viscosity and even less for the replacement of the latex. To assess the effect of the replacement of latex by the hydrolysed proteins of different botanical origin, the R1 mixture was selected as a reference recipe for a coating.
    The coatings were realized as in Example 1 according to the formula in Table 3, the synthetic latex being replaced by a maximum of 14% proteins (R5), 30% (R6) and 43% (R7)
    Table 3: Coating compositions comprising dextrin and proteins to partially replace the latex
    To reduce the amount of latex in coating compositions, hydrolyzed wheat and soy proteins were tested based on the ratios in Table 3.
    The proteins tested are the following:
    Low molecular weight hydrolyzed wheat proteins (Mw = 5.7 kDa)
    Hydrolysed wheat proteins with an average molecular weight of 15.5 kDa (508 SOLPRO® commercialized by TEREOS SYRAL) and
    Hydrolyzed soy protein (SOBIND LVL from Dupont).
    The proteins are added to the coating without prior dilution.
    The coating is carried out as in Example 1, by a mixer (type ΓΚΑ) by suspending calcium carbonate in water at 79.7% (HYDROCARB® 90 supplied by OMYA). Subsequently, the synthetic binder (styrene-butadiene latex DL930 from STYRON) and dextrin in solution are added to calcium carbonate as specified above. The protein is included at this stage in the coating in the form of a solution or powder according to conditions. The concentration is adjusted with water to a dry matter content of 70%. The stirring speed is set at 1500 rpm, the pH is then set at 9. The coating is stirred well for 10 minutes
    Table 4: Brooked viscosity of coating compositions in which 14%, 30% and 43% of the latex is replaced by a mixture of dextrins and hydrolysed proteins and tear resistance property of the resulting paper.
    When reading the results (Table 4), we note that the replacement of the latex at more than 40% by each of the hydrolysed tested proteins does not allow the tear resistance properties obtained by the latex to be retained. Only the hydrolysates of soy proteins and partially hydrolysed wheat proteins allow a replacement of up to 35% (R6).
    However, the replacement of the latex with the hydrolyzed soy protein results in a net increase in viscosity of 14% (R1). This increase is more pronounced at 30% (R6) and 42% (R7), making the coating composition difficult to use. Such viscosity has not allowed application on an industrial scale because it causes a significant increase in pressure during deposition, thereby creating processability and paper quality problems.
    Conversely, hydrolysates of low molecular weight wheat proteins have a limited influence on the viscosity of the resulting composition but do not allow the latex reduction to be compensated by 30%. Indeed, with 30% latex replacement, a tear resistance loss is observed (0.45 IGT with 0% replacement: 0.5 to 14% when replacing 0.30-30% replacement).
    Among the various hydrolysed proteins tested, only the partially hydrolysed wheat proteins allow a substantial increase in tear resistance with 14% replacement of the latex (composition R5).
    In addition, only partially hydrolysed wheat proteins can retain both the characteristics of tear resistance and the viscosity. In fact, the replacement of 30% of the latex (R6) has been replaced with (R1) against 0.42 m / s while retaining the tear resistance properties as well as the viscosity properties of the resulting composition (0.45 m / s for 0 parts) 30% replaced (R6)).
    In addition, the interest in hydrolyzed wheat proteins is in contrast to soy proteins, they are sufficiently soluble to be added directly to the coating and no prior dilution is required which adds a substantial amount of water and thus the dry matter content of the coating decreases, so that relatively free variation can be made within the dry matter of the composition.
    权利要求:
    Claims (15)
    [1]
    CONCLUSIONS
    A coating composition for paper or cardboard with a dry substance content between 45 and 80%, preferably 50 and 78%, comprising • binders including at least one modified starch and a synthetic adhesive, • a hydrolysed wheat protein with an average molecular weight located between 7 and 100,000, and • a mineral filler.
    [2]
    Composition according to claim 1, characterized in that the hydrolysed wheat protein has an average molecular weight between 8 and 100 kDa, preferably between 9 and 80 kDa.
    [3]
    Composition according to one or more of claims 1 and 2, characterized in that it comprises for 100 parts by weight of mineral filler: - 1 to 99 parts of binders, and - 1 to 50 parts by weight of wheat protein.
    [4]
    Composition according to any of claims 1 to 3, characterized in that it comprises a modified starch / synthetic adhesive ratio of 1: 5 to 5: 1.
    [5]
    Composition according to any of claims 1 to 4, characterized in that it comprises a binder / wheat protein ratio of 1: 5 to 5: 1.
    [6]
    Composition according to any of claims 1 to 5, characterized in that the modified starch is selected from a pregelatinized starch, a dextrin, a hydrolyzed starch, an oxidized starch, a starch ester, a starch ether, a cross-linked starch and their mixtures, preferably the modified starch is a dextrin.
    [7]
    Composition according to any one of the preceding claims, characterized in that the dextrin has a molecular weight between 20 and 300 kD, and / or a viscosity between 50 and 400 mPa.s.
    [8]
    Composition according to any of the preceding claims, characterized in that the synthetic adhesive is selected from the group consisting of latex, vinyl acetates, polyvinyl alcohol, sodium carboxymethyl cellulose and hydroxyethyl cellulose.
    [9]
    A composition according to any one of the preceding claims, characterized in that the synthetic adhesive is a latex, preferably selected from the group consisting of styrene butadiene latexes, polyvinyl alcohol latexes and acrylic copolymer latexes.
    [10]
    A method of manufacturing the composition according to any of claims 1 to 9, comprising the following steps: - mixture with stirring of a mineral filler and binders including at least one modified starch and a synthetic adhesive, preferably said modified starch has preferably undergone a b step, - adding with stirring to the resulting mixture a hydrolysed wheat protein with an average molecular weight between 7 and 100,000, preferably, said hydrolysed wheat protein is in a powder form, - adding water with stirring to obtain a composition with a solid content between 45 and 80%, typically, the addition of water is carried out with the mineral filler and / or the modified starch and / or hydrolyzed protein.
    [11]
    A method for coating or blue coloring paper or cardboard, said method comprising the steps of (a) providing a composition according to any of claims 1 to 9, (b) depositing said composition on a substrate from paper or cardboard.
    [12]
    A paper or cardboard coated with the composition according to any one of claims 1 to 9 or obtained with the method according to claim 11.
    [13]
    Use of a hydrolyzed wheat protein in the replacement of the latex in a paper or cardboard coating composition, preferably said hydrolyzed wheat protein has an average molecular weight between 7 and 100,000.
    [14]
    Use according to claim 13, characterized in that said composition comprises • Binders including at least one modified starch and an adhesive, preferably synthetic, • A hydrolysed wheat protein with an average molecular weight between 7 and 100,000 and • a mineral filler .
    [15]
    Use according to any of claims 13 and 14, characterized in that the binder / wheat protein ratio is from 1: 5 to 5: 1.
    类似技术:
    公开号 | 公开日 | 专利标题
    US9695551B2|2017-07-04|Process for preparing stable dispersions of starch particles
    US8597422B2|2013-12-03|Pigment and filler and a method of manufacturing it
    JP2013527866A|2013-07-04|binder
    CA1218480A|1987-02-24|Composition and process for coating paper andcardboard, process for preparing the composition andpaper and cardboard so obtained
    KR101819056B1|2018-01-16|Process for preparing stable starch dispersions
    US10323158B2|2019-06-18|Coating slips based on partially soluble dextrins of high molecular weight
    WO2011084692A1|2011-07-14|Methods of using biobased latex binders for improved printing performance
    JP5749175B2|2015-07-15|Method for improving the rheological properties of aqueous pigment slurries, dispersants and uses thereof
    EA028114B1|2017-10-31|Methods and means for coating paper by film coating
    CA2446773C|2015-01-13|Method for production of corrugated board and product obtained thereof
    EP3146006B1|2022-01-05|Coating composition
    BE1023282B1|2017-01-20|Coating composition comprising hydrolysed wheat proteins
    CN105143552B|2018-05-25|Applicator based on dextrin
    US10837142B2|2020-11-17|Paper coating composition with highly modified starches
    BE1025085B1|2018-10-29|COMPOSITION OF DEXTRINES WITH STABLE VISCOSITY WHEN PAPER AND / OR CARDBOARD COATING
    同族专利:
    公开号 | 公开日
    EP3262232A1|2018-01-03|
    EP3262232B1|2019-04-03|
    FR3032979B1|2017-02-10|
    BR112017015729A2|2018-03-13|
    FR3032979A1|2016-08-26|
    CN107532390A|2018-01-02|
    CA2975499A1|2016-09-01|
    US20180044858A1|2018-02-15|
    WO2016135625A1|2016-09-01|
    JP2018511712A|2018-04-26|
    BE1023282A1|2017-01-20|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB674131A|1948-09-22|1952-06-18|American Cyanamid Co|Improvements in or relating to proteinaceous compositions|
    US5766331A|1996-10-25|1998-06-16|Protein Technologies International, Inc.|Protein adhesive binder and process for forming a protein adhesive binder|
    EP1964969A1|2007-02-27|2008-09-03|Cargill, Incorporated|Coating Compositions|
    GB9123251D0|1991-11-01|1991-12-18|Croda Int Plc|Protein-silicone copolymers|
    US5268030A|1992-03-23|1993-12-07|Sequa Chemicals Inc.|Paper coating composition containing a zirconium chelate insolubilizer|
    US6517625B2|2001-01-03|2003-02-11|Mgp Ingredients, Inc.|Protein/starch paper coating compositions and method of use thereof|
    AU2003901311A0|2003-03-21|2003-04-03|George Weston Foods Limited|Coating compositions|
    US7625441B2|2005-02-09|2009-12-01|Solae, Llc|Paper coating formulation having a reduced level of binder|
    KR101666005B1|2009-08-12|2016-10-13|뉴페이지 코포레이션|Inkjet recording medium|
    US10323158B2|2011-11-18|2019-06-18|Roquettes Freres|Coating slips based on partially soluble dextrins of high molecular weight|
    CN102864689A|2012-09-21|2013-01-09|江南大学|Wheat protein coating food wrap paper and preparation method thereof|
    法律状态:
    2020-10-28| MM| Lapsed because of non-payment of the annual fee|Effective date: 20200229 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1500337A|FR3032979B1|2015-02-23|2015-02-23|COATING COMPOSITION COMPRISING HYDROLYZED WHEAT PROTEINS|
    FR1500337|2015-02-23|
    [返回顶部]