Paint composition

Abstract

The invention relates to an aqueous coating preparation composition combining a binding agent and an organic, organometallic or mineral pigment dispersed by means of a polymer of itaconic acid. The invention also relates to a dispersing agent comprising this polymer and to a coating method which uses the aqueous composition according to the invention.

Description

[0001] PAINT COMPOSITION

[0002] The invention relates to an aqueous coating preparation composition combining a binding agent and an organic, organometallic, or mineral pigment dispersed by means of an itaconic acid polymer. The invention also relates to a dispersing agent comprising this polymer and a coating method that implements the aqueous composition according to the invention.

[0003] Compositions comprising a binder and a pigment dispersed with a dispersing agent are known for the preparation of paint compositions.

[0004] In general, paint composition preparation methods must be efficient and allow for good viscosity control. Viscosity drift must be controlled because it can lead to changes in texture, making handling or application difficult or even impossible. Similarly, mineral particle sedimentation must be avoided or significantly slowed. In addition to stability control, viscosity control of paint compositions is therefore also essential. The stability of mineral compositions is a key characteristic not only during their preparation but also during transport and storage. It is therefore necessary for these compositions to have improved stability.

[0005] Besides stability, controlling the rheology, particularly the viscosity, of paint compositions is also an essential property, both during their preparation and application. It is also necessary to improve the stability of these compositions throughout their shelf life.

[0006] Controlling the rheology, particularly the viscosity, of these compositions also allows for easier use of these compositions.

[0007] The fineness of the ground pigments used in paints is also important because coarse pigment particles generally reduce a paint's properties, including funiformity and color opacity.

[0008] Within aqueous compositions, the polymers used are expected to develop significant interactions with mineral matter particles.

[0009] Finally, from an environmental perspective, it is important to have access to polymers prepared from reagents of renewable or natural origin, particularly reagents of plant origin. Document FR 2574086 describes the implementation of a dispersant for reactive pigments used in anti-corrosion paints to make them compatible with the binding emulsions of these paints.

[0010] Document JP 11106435 describes the preparation of paper coating slurries comprising a copolymer of itaconic acid, acrylonitrile acrylic acid, and hydroxyethyl acrylate. Document WO 9715616 concerns water-dispersible powder compositions comprising a film-forming polymer, a surfactant compound, and a water-soluble polyacid electrolyte.

[0011] Document JP 2005046781 describes the preparation of a mineral suspension comprising the use of a dispersing copolymer prepared with acrylic acid, acrylate, and a methoxy-PEG methacrylate. Document JP 2022080874 describes an aluminum-based composition used to improve the quality and strength of coated paper, which comprises a crosslinked acrylamide copolymer.

[0012] Document WO 2018087469 describes a method for grinding mineral material in the presence of a sodium polyitaconate that is partially decarboxylated.

[0013] Existing compositions do not always offer the properties necessary to solve these problems. Therefore, improved coating preparation compositions are needed. The composition according to the invention provides a solution to all or some of the problems of prior art compositions.

[0014] Thus, the invention provides an aqueous coating preparation composition R comprising:

[0015] - at least one water-soluble polymer P, having a molecular mass Mw, measured by CES, ranging from 1,000 g / mol to 50,000 g / mol, and prepared by a radical polymerization reaction in water, of at least one compound Ml selected from itaconic anhydride, itaconic acid, sodium itaconate, potassium itaconate, lithium itaconate, ammonium itaconate, calcium itaconate, magnesium itaconate and their combinations,

[0016] - at least one organic, organometallic or mineral pigment Q and

[0017] - at least one binding agent B.

[0018] Preferably, for composition R according to the invention, polymer P has a molecular mass Mw, measured by CES, ranging from 1200 g / mol to 50,000 g / mol or from 1200 g / mol to 40,000 g / mol. More preferably, polymer P has a molecular mass ranging from 1200 g / mol to 25,000 g / mol or from 1200 g / mol to 20,000 g / mol; more preferably from 1500 g / mol to 20,000 g / mol; even more preferably from 1500 g / mol to 15,000 g / mol; much more preferably from 1500 g / mol to 10,000 g / mol; particularly preferably from 1500 g / mol to 8,000 g / mol.

[0019] Preferably for composition R according to the invention, polymer P has a polymolecularity index IP, measured by CES, of less than 5.5, preferably less than 4.5, more preferably less than 4 or 3.5.

[0020] Also preferably, polymer P has a polymolecularity index IP, measured by CES, ranging from 1.6 to 5.5, preferably ranging from 1.6 to 4.5 or from 1.6 to 3.5.

[0021] According to the invention, polymer P can be totally or partially neutralized. Preferably, polymer P can be neutralized by means of an ion selected from a monovalent ion, a divalent ion, and combinations thereof, more preferably by means of an ion selected from K + , N / A + , Li + NEW + , Mg 2+ , That 2+and their combinations. Also preferably, polymer P can be totally or partially neutralized by means of at least one compound selected from LiOH, NaOH, KOH, Zn(OH)2, Mg(OH)2, Ca(OH)2, ZnO, MgO, CaO, ammonium derivatives, ammonia, ammonia, amino bases, for example triethanolamine, aminomethylpropanol, diethanolisopropylamine or 2-amino-2-methylpropanol (AMP) and their combinations, more preferably NaOH, Ca(OH)2, CaO and their combinations.

[0022] Preferably according to the invention, the polymer P is not in the form of an emulsion.

[0023] According to the invention, polymer P is prepared by a radical polymerization reaction in water of at least one compound Ml. Preferably, for the method according to the invention, the polymerization reaction involves a combination of itaconic acid and an itaconate, preferably a combination of itaconic acid and an itaconate selected from sodium itaconate, potassium itaconate, lithium itaconate, and ammonium itaconate. Also preferably, the polymerization reaction involves a combination of itaconic acid and an itaconate in a molar ratio of itaconic acid / itaconate ranging from 80 / 20 to 20 / 80, more preferably ranging from 45 / 55 to 55 / 45.

[0024] Preferably according to the invention, compound Ml does not comprise an ester group; in particular, compound Ml is not an itaconic acid ester, especially an itaconic acid diester. Besides compound Ml, polymer P can also be prepared using at least one other compound different from compound Ml, preferably from 0.5% to 65% by weight, more preferably from 0.5% to 50% by weight or from 0.5% to 30% by weight, of another compound relative to the total weight of monomers.

[0025] Thus, polymer P can also be prepared using another compound chosen from:

[0026] • a compound M2 selected from acrylic acid, methacrylic acid, an acrylic acid oligomer, a methacrylic acid oligomer, an acrylic acid salt, a methacrylic acid salt, an acrylic acid oligomer salt, a methacrylic acid oligomer salt, maleic acid, maleic anhydride, crotonic acid, 2-acrylamido-2-methylpropane sulfonic acid, a salt of 2-acrylamido-2-methylpropane sulfonic acid, ethoxymethacrylate sulfonic acid, sodium methallyl sulfonate, styrene sulfonate, phosphated hydroxyethyl acrylate, phosphated hydroxyethyl methacrylate, phosphated hydroxypropyl acrylate, phosphated hydroxypropyl methacrylate, phosphated hydroxybutyl acrylate, phosphated hydroxybutyl methacrylate and their combinations;

[0027] • a compound M3 independently selected from C1-C12 esters of methacrylic acid, C1-C12 esters of acrylic acid, acrylamide, N-Zc / V-butylacrylamide, alkylacrylamides, N-methylolacrylamide, acrylonitrile, vinyl-lactam, N-vinylpyrrolidone, ureidomethacrylate, hydroxyethylacrylate, hydroxyethylmethacrylate, hydroxypropylacrylate, hydroxypropylmethacrylate, hydroxybutylmethacrylate, hydroxybutylacrylate, caprolactone methacrylate, caprolactone acrylate, polycaprolactone methacrylate, polycaprolactone acrylate, lactame methacrylate, lactame acrylate, polycaprolactame methacrylate, polycaprolactame acrylate, vinyl acetate and combinations thereof; preferably Ci-Cs esters of methacrylic acid, Ci-Cs esters of acrylic acid and their combinations;preferably, N-tert-butylacrylamide, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, more preferably, methyl methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate and their combinations.;

[0028] According to the invention, the polymerization reaction involves an initiating compound, preferably an initiating compound selected from a peroxide (e.g., hydrogen peroxide, / c / V-butyl hydroperoxide), a persalt, preferably a persulfate (e.g., sodium persulfate, ammonium persulfate, potassium persulfate), combinations thereof, and optionally a metal salt, preferably a metal salt selected from an iron salt (e.g., Fe 11 or Fe 111 ), a copper salt (for example Cu 1 or Cu 11 ) and their combinations.

[0029] Also, the polymerization reaction can be carried out in the presence of at least one sulfur compound Tl comprising sulfur in oxidation state IV (sulfur IV or S IV Preferably, compound Tl is selected from lithium hydrogen sulfite, sodium hydrogen sulfite, potassium hydrogen sulfite, ammonium hydrogen sulfite, calcium di(hydrogen sulfite), magnesium di(hydrogen sulfite), and combinations thereof. Preferably, compound Tl is used in an amount of 0.5% by weight to 15% by weight, preferably 1% by weight to 10% by weight, and more preferably 1.5% by weight to 8% by weight, relative to the total dry weight amount of monomers used in the polymerization reaction.

[0030] The polymerization reaction can also be carried out in the presence of at least one phosphorus compound T2 comprising phosphorus in oxidation state I (phosphorus I or P 1) or containing phosphorus in oxidation state III (phosphorus III or P 111 Preferably, compound T2 is selected from hypophosphorous acid, sodium hypophosphite, ammonium hypophosphite, phosphorous acid, sodium phosphite, and ammonium phosphite. Preferably, compound T2 is used in an amount of 0.5% by weight to 15% by weight, preferably 1% by weight to 10% by weight, and more preferably 1.5% by weight to 8% by weight, relative to the total dry weight amount of monomers used in the polymerization reaction.

[0031] The composition R according to the invention comprises at least one pigment Q, which may be an organic pigment, an organometallic pigment, or a mineral pigment. Preferably, the composition R comprises one, two, or three pigments Q.

[0032] According to the invention, pigment Q may be synthetic or of natural origin. Preferably, pigment Q is selected from alkaline earth metal carbonates, preferably calcium carbonate (natural calcium carbonate or precipitated calcium carbonate), strontium carbonate, magnesium carbonate, barium carbonate, dolomite, kaolin, titanium dioxide, silica, talc, lime, magnesium hydroxide, calcium sulfate, barium sulfate, iron oxide, carbon black, cadmium sulfide, clays, silicates, mica, chromium oxides, zinc oxide, zinc molybdate, zinc chromate, lead silicochromate, barium metaborate, and combinations thereof. The preferred pigment Q is calcium carbonate. More preferably, pigment Q is not kaolin.According to the invention, the pigment Q can be in the form of particles, preferably particles whose median size, measured by sedimentometry, is less than 50 pm or a median size ranging from 0.05 pm to 50 pm or to 20 pm or a median size less than 10 pm or to 5 pm or to 2 pm.

[0033] Essentially, the composition R according to the invention comprises at least one binding agent B, preferably a binding agent B that is a sterically modified binding compound. Preferably according to the invention, the binding agent B is selected from polyvinyl acetate resins, polyvinyl acetate latex, methyl methacrylate resins, methyl methacrylate latex, acrylic resins, acrylic latex, vinylacrylic resins, vinylacrylic latex, vinyl-versatate resins, vinyl-versatate latex, styrenic resins, styrenic latex, styrene-acrylic resins, styrene-acrylic latex, linseed oil resins, rapeseed oil resins, and combinations thereof.Preferably according to the invention, the binding agent B is selected from polyvinyl acetate resins, polyvinyl acetate latex, methyl methacrylate resins, methyl methacrylate latex, acrylic resins, acrylic latex, vinylacrylic resins, vinylacrylic latex, vinyl-versatate resins, vinyl-versatate latex, styrenic resins, styrenic latex, linseed oil resins, rapeseed oil resins, and combinations thereof. More preferably according to the invention, the binding agent B is different from polyvinyl alcohol (PVOH), starch, carboxymethylcellulose (CMC), or a styrene-butadiene polymer, in particular a styrene-butadiene latex.

[0034] The aqueous composition R according to the invention allows for the preparation of a coating. Preferably, the composition R according to the invention is an ink composition, a varnish composition, an adhesive composition, or a paint composition, for example, decorative or industrial paint. More preferably, the composition R comprises:

[0035] - from 0.1% to 4% by dry weight of polymer P,

[0036] - from 3% to 65% by dry weight of pigment Q,

[0037] - 9.9% to 15% by dry weight of binding agent B,

[0038] - from 19.9% ​​to 88% water by weight.

[0039] Preferably, composition R also includes:

[0040] - from 0.1% to 4% by dry weight of polymer P,

[0041] - 3% to 30% by dry weight of pigment Q,

[0042] - from 5% to 70% by dry weight of binding agent B,

[0043] - from 26.9% to 82.9% by weight of water. According to the invention, the composition R may also optionally include at least one agent selected from a particle spacer, a steric stabilizer, an electrostatic stabilizer, an opacifying agent, a coloring agent, a dispersing agent other than polymer P, a solvent, a coalescing agent, an antifoaming agent, a preservative, a biocidal agent, a spreading agent, a thickening agent, a film-forming copolymer and mixtures thereof.

[0044] The invention also provides a method for preparing an aqueous composition R according to the invention, comprising mixing it in water and stirring:

[0045] - of at least one water-soluble polymer P,

[0046] - of at least one organic, organometallic or mineral pigment Q and

[0047] - of at least one binding agent B.

[0048] The invention also provides a method for controlling the viscosity of a composition R according to the invention comprising the addition of at least one polymer P into an aqueous composition comprising at least one organic, organometallic or mineral pigment Q and at least one binding agent B.

[0049] The polymer P according to the invention allows for the effective control of the properties of the composition R. Generally, according to the invention, the polymer P is used in an aqueous medium and preferably in combination with water. Thus, the invention also provides an aqueous agent G comprising at least one polymer P for controlling the viscosity of an aqueous composition R according to the invention.

[0050] Preferably, the aqueous agent G according to the invention also comprises at least one solvent, in particular a coalescing solvent, for example glycol, butyl glycol, butyldiglycol, monopropylene glycol, ethylene glycol, ethylenediglycol, "Dowanol" products of which CAS number is 34590-94-8, "Texanol" products of which CAS number is 25265-77-4; or combined with at least one additive selected from an amphiphilic compound, in particular a surfactant compound, preferably a hydroxylated surfactant compound, for example alkyl-polyalkylene glycol, in particular alkyl-polyethylene glycol and alkyl-polypropylene glycol; a polysaccharide derivative, for example cyclodextrin, cyclodextrin derivative, polyethers, alkyl-glucosides; a hydrotropic compound, an antifoaming agent, a biocidal agent and combinations thereof.

[0051] According to the invention, the particular, advantageous, or preferred characteristics of the composition R according to the invention and of its method of preparation define aqueous agents G and methods of using the composition R and the agent G according to the invention that are also particular, advantageous, or preferred. The various aspects of the invention can be illustrated by the following examples. The methods or techniques implemented are known or described.

[0052] EXAMPLES

[0053] Preparation and characterization of polymers P according to the invention

[0054] Preparation of the PI polymer according to the invention

[0055] In a glass reactor, 207 g of itaconic acid (compound Ml) is introduced, and then added

[0056] 127.38 g of a 50 wt% aqueous sodium hydroxide solution. The reaction is exothermic, the reactor temperature is maintained at 97°C + / - 2°C, then 0.04 g of iron sulfate heptahydrate and 10 g of deionized water are introduced.

[0057] In the first beaker, 27.3 g of hydrogen peroxide solution (35 wt.) and 21 g of deionized water are weighed out. In the second beaker, 25 g of sodium bisulfite solution (40 wt.) are weighed out.

[0058] The reagents from the two beakers are introduced in parallel into the reactor for 2 hours, and the temperature is maintained at 97°C ± 2°C. Then, 150 g of deionized water is added, and the mixture is allowed to cool to room temperature. The resulting composition, CPI, comprises the PI copolymer according to the invention at 46.3% by weight of dry extract, the composition and characteristics of which are detailed in Table 1.

[0059] Preparation of polymer P2 according to the invention

[0060] In a glass reactor, 207 g of itaconic acid (compound Ml) is introduced, and then added

[0061] 127.39 g of a 50 wt% aqueous sodium hydroxide solution. The reaction is exothermic, the reactor temperature is maintained at 97°C + / -2°C, then 0.009 g of copper sulfate pentahydrate and 10 g of deionized water are introduced.

[0062] In the first beaker, 27.3 g of hydrogen peroxide solution (35% wt.) are weighed out. In the second beaker, 25 g of sodium bisulfite solution (40% wt.) are weighed out.

[0063] The reagents from the two beakers are introduced in parallel into the reactor for 2 hours, and the temperature is maintained at 97°C ± 2°C. Then, 150 g of deionized water is added, and the mixture is allowed to cool to room temperature. The resulting composition, CP2, comprises the copolymer P2 according to the invention at 48.1% by weight of dry extract, the composition and characteristics of which are detailed in Table 1.

[0064] Preparation of polymer P 3 according to the invention

[0065] In a glass reactor, 207 g of itaconic acid (compound Ml) is introduced, and then added

[0066] 127.39 g of a 50 wt% aqueous sodium hydroxide solution. The reaction is exothermic, the reactor temperature is maintained at 97°C + / -2°C, then 0.019 g of copper sulfate pentahydrate and 10 g of deionized water are introduced.

[0067] In the first beaker, 27.3 g of hydrogen peroxide solution (35% wt.) are weighed out. In the second beaker, 25 g of sodium bisulfite solution (40% wt.) are weighed out.

[0068] The reagents from the two beakers are introduced in parallel into the reactor for 2 hours, and the temperature is maintained at 97°C ± 2°C. Then, 150 g of deionized water is added, and the mixture is allowed to cool to room temperature. The resulting composition, CP3, comprises the P3 copolymer according to the invention at 48.1% by weight of dry extract, the composition and characteristics of which are detailed in Table 1.

[0069] Preparation of polymer P 4 according to the invention

[0070] In a glass reactor, 207 g of itaconic acid (compound Ml) and 210 g of deionized water are introduced, followed by 127.39 g of a 50 wt% aqueous sodium hydroxide solution. The reaction is exothermic, and the reactor temperature is maintained at 100°C ± 2°C under reduced pressure to distill 200 g of water. The temperature is then cooled to 97°C, and 0.028 g of copper(II) sulfate pentahydrate is added.

[0071] In the first beaker, 27.3 g of hydrogen peroxide solution (35% wt.) and 27 g of deionized water are weighed out. In the second beaker, 15 g of sodium bisulfite solution (40% wt.) are weighed out.

[0072] The reagents from the two beakers are introduced in parallel into the reactor for 2 hours, and the temperature is maintained at 97°C ± 2°C. Then, 250 g of deionized water is added, and the mixture is allowed to cool to room temperature. The resulting composition, CP4, comprises the P4 copolymer according to the invention at 37.6% by weight of dry extract, the composition and characteristics of which are detailed in Table 1.

[0073] Preparation of polymer P 5 according to the invention

[0074] In a glass reactor, 207 g of itaconic acid (compound Ml) are introduced, followed by 127.38 g of a 50 wt% aqueous sodium hydroxide solution. The reaction is exothermic, the reactor temperature is maintained at 90°C ± 2°C, and then 21 g of deionized water are introduced.

[0075] In a first beaker, 10.3 g of sodium persulfate and 21 g of deionized water are weighed out. The reagents from the beaker are introduced all at once into the reactor, and the temperature is maintained at 90°C ± 2°C for 2 hours. Then, 150 g of deionized water is added, and the mixture is allowed to cool to room temperature. The P5 polymer solution is neutralized to pH 7.4 by adding 50 wt% sodium hydroxide to the water. The resulting composition, CP5, comprises the P5 polymer according to the invention at 47.0 wt% dry extract, the composition and characteristics of which are detailed in Table 1.

[0076] Preparation of polymer P 6 according to the invention

[0077] In a glass reactor, 207 g of itaconic acid (compound Ml) are introduced, followed by 127.39 g of a 50 wt% aqueous sodium hydroxide solution. The reaction is exothermic, the reactor temperature is maintained at 90°C ± 2°C, and then 0.008 g of iron(II) sulfate heptahydrate diluted in 10 g of deionized water is added all at once.

[0078] In the first beaker, 27.3 g of hydrogen peroxide solution (35 wt.) and 27 g of deionized water are weighed out. In the second beaker, 25 g of sodium bisulfite solution (40 wt.) are weighed out.

[0079] The reagents from the two beakers are introduced in parallel into the reactor for 2 hours, and the temperature is maintained at 90°C ± 2°C for 1 hour. Then, 150 g of deionized water is added, and the mixture is allowed to cool to room temperature.

[0080] The P6 polymer solution is neutralized to pH 7.9 by adding 50% (w / m) sodium hydroxide to water. The resulting composition, CP6, comprises the P6 polymer according to the invention at 44.4% (w / m) dry extract, the composition and characteristics of which are detailed in Table 1.

[0081] Table 1

[0082] Preparation and characterization of compositions R according to the invention

[0083] Paint compositions RI to R4 according to the invention are prepared from aqueous compositions CPI to CP4. All the ingredients are mixed under agitation according to the proportions (% by mass) shown in Table 2.

[0084]

[0085] Table 2

[0086] For the RI to R4 paint compositions according to the invention, the Brookfield viscosity, measured at 25°C, at 10 rpm and at 100 rpm (pBkio and pBkioo in mPa.s), and the Stormer viscosity at 25°C, measured at a medium shear gradient (ps in Krebs Units or

[0087] KU), the Cone Plane viscosity or ICI viscosity at 25°C, measured at high shear gradient (pi in mPa.s):

[0088] - 24 hours after their preparation,

[0089] - 8 days after their preparation, after storage at room temperature for 7 days and

[0090] - 8 days after their preparation, after being stored in an oven at 50°C for 7 days.

[0091]

[0092] Table 3

[0093] The itaconic acid polymers according to the invention, implemented in small quantities, allow good control of the different components of the viscosity of paint compositions.

Claims

DEMANDS 1. Aqueous composition R of coating preparation comprising: - at least one water-soluble polymer P, having a molecular mass Mw, measured by CES, ranging from 1,000 g / mol to 50,000 g / mol, and prepared by a radical polymerization reaction in water, of at least one compound Ml selected from itaconic anhydride, itaconic acid, sodium itaconate, potassium itaconate, lithium itaconate, ammonium itaconate, calcium itaconate, magnesium itaconate and their combinations, - at least one organic, organometallic or mineral pigment Q and - at least one binding agent B.

2. Composition R according to claim 1, wherein: - the polymer P has a molecular mass Mw, measured by CES, ranging from 1200 g / mol to 50,000 g / mol or from 1200 g / mol to 40,000 g / mol; preferably from 1200 g / mol to 25,000 g / mol or from 1200 g / mol to 20,000 g / mol; more preferably from 1500 g / mol to 20,000 g / mol; even more preferably from 1500 g / mol to 15,000 g / mol; much more preferably from 1500 g / mol to 10,000 g / mol or from 1500 g / mol to 8,000 g / mol; or - polymer P has a polymolecularity index (PI), measured by CES, of less than 5.5, preferably less than 4.5, more preferably less than 4 or 3.5; or - polymer P has a polymolecularity index (PI), measured by CES, ranging from 1.6 to 5.5, preferably ranging from 1.6 to 4.5, more preferably ranging from 1.6 to 3.5; or - the polymer P is totally or partially neutralized, preferably by means of an ion chosen from a monovalent ion, a divalent ion and their combinations, more preferably by means of an ion chosen from K + , N / A + , Li + NEW + , Mg 2+ , That 2+ and their combinations; also preferably, polymer P is totally or partially neutralized by means of at least one compound selected from LiOH, NaOH, KOH, Zn(OH)2, Mg(OH)2, Ca(OH)2, ZnO, MgO, CaO, ammonium derivatives, ammonia, ammonia, amino bases, for example triethanolamine, aminomethylpropanol, diethanolisopropylamine or 2-amino-2-methylpropanol (AMP) and their combinations, more preferably NaOH, Ca(OH)2, CaO and their combinations.

3. Composition R according to claim 1 or 2, wherein: - the polymerization reaction involves a combination of itaconic acid and an itaconate, preferably a combination of itaconic acid and an itaconate selected from sodium itaconate, potassium itaconate, lithium itaconate, ammonium itaconate; also preferably a combination of itaconic acid and an itaconate in a molar ratio of an itaconic acid / itaconate combination ranging from 80 / 20 to 20 / 80, preferably ranging from 45 / 55 to 55 / 45; or - the polymer P is also prepared using at least one other compound different from compound Ml, preferably from 0.5% by weight to 65% by weight, more preferably from 0.5% by weight to 50% by weight or from 0.5% by weight to 30% by weight of another compound relative to the total weight amount of monomers; or - Polymer P is also prepared using another compound selected from: • a compound M2 selected from acrylic acid, methacrylic acid, an acrylic acid oligomer, a methacrylic acid oligomer, an acrylic acid salt, a methacrylic acid salt, an acrylic acid oligomer salt, a methacrylic acid oligomer salt, maleic acid, maleic anhydride, crotonic acid, 2-acrylamido-2-methylpropane sulfonic acid, a salt of 2-acrylamido-2-methylpropane sulfonic acid, ethoxymethacrylate sulfonic acid, sodium methallyl sulfonate, styrene sulfonate, phosphated hydroxyethyl acrylate, phosphated hydroxyethyl methacrylate, phosphated hydroxypropyl acrylate, phosphated hydroxypropyl methacrylate, phosphated hydroxybutyl acrylate, phosphated hydroxybutyl methacrylate and their combinations; • a compound M3 independently selected from the following: C1-C12 esters of methacrylic acid, C1-C12 esters of acrylic acid, acrylamide, N-Zc / V-butylacrylamide, alkylacrylamides, N-methylolacrylamide, acrylonitrile, vinyl lactam, N-vinylpyrrolidone, ureidomethacrylate, hydroxyethylacrylate, hydroxyethylmethacrylate, hydroxypropylacrylate, hydroxypropylmethacrylate, hydroxybutylmethacrylate, hydroxybutylacrylate, caprolactone methacrylate, caprolactone acrylate, polycaprolactone methacrylate, polycaprolactone acrylate, lactam methacrylate, lactam acrylate, polycaprolactame methacrylate, polycaprolactame acrylate, acetate of vinyl and their combinations; preferably Ci-Cs esters of methacrylic acid, Ci-Cs esters of acrylic acid and their combinations; preferably, N-Zc / V-butylacrylamide, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, more preferably, methyl methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate and their combinations.

4. Composition R according to any one of claims 1 to 3, wherein: - The polymerization reaction uses an initiating compound chosen from a peroxide (e.g., hydrogen peroxide, / c / V-butyl hydroperoxide), a persalt, preferably a persulfate (e.g., sodium persulfate, ammonium persulfate, potassium persulfate), combinations thereof, and possibly associations with a metal salt, preferably a metal salt chosen from an iron salt (e.g., Fe 11 or Fe111 ), a copper salt (for example Cu 1 or Cu 11 ) and their combinations; or - The polymerization reaction is carried out in the presence of at least one sulfur compound Tl comprising sulfur in oxidation state IV (sulfur IV or S IV ), preferably the compound Tl is selected from lithium hydrogen sulfite, sodium hydrogen sulfite, potassium hydrogen sulfite, ammonium hydrogen sulfite, calcium di(hydrogen sulfite), magnesium di(hydrogen sulfite) and combinations thereof; also preferably, the compound Tl is used in an amount of 0.5% by weight to 15% by weight, preferably 1% by weight to 10% by weight, more preferably 1.5% by weight to 8% by weight, relative to the total dry weight amount of monomers used in the polymerization reaction; or - The polymerization reaction is carried out in the presence of at least one phosphorus compound T2 comprising phosphorus in oxidation state I (phosphorus I or P 1 ) or containing phosphorus in oxidation state III (phosphorus III or P 111 ), preferably the compound T2 is chosen from hypophosphorous acid, sodium hypophosphite, ammonium hypophosphite, phosphorous acid, sodium phosphite, ammonium phosphite, also preferably the compound T2 is used in an amount of 0.5% by weight to 15% by weight, preferably 1% by weight to 10% by weight, more preferably 1.5% by weight to 8% by weight, relative to the total dry weight amount of monomers used in the polymerization reaction.

5. Composition R according to any one of claims 1 to 4, wherein: - one or two or three pigments Q are used; or - pigment Q is synthetic or of natural origin, preferably pigment Q is selected from alkaline earth metal carbonates, preferably calcium carbonate (natural calcium carbonate or precipitated calcium carbonate), strontium carbonate, magnesium carbonate, barium carbonate, dolomite, kaolin, titanium dioxide, silica, talc, lime, magnesium hydroxide, calcium sulfate, barium sulfate, iron oxide, carbon black, cadmium sulfide, clays, silicates, mica, chromium oxides, zinc oxide, zinc molybdate, zinc chromate, lead silicochromate, barium metaborate and combinations thereof; or - pigment Q is in the form of particles, preferably particles whose median size, measured by sedimentometry, is less than 50 pm or a median size ranging from 0.05 pm to 50 pm or to 20 pm or a median size less than 10 pm or to 5 pm or to 2 pm.

6. Composition R according to any one of claims 1 to 5 wherein the binding agent B is a sterically modified binding compound, preferably a binding agent B selected from polyvinyl acetate resins, polyvinyl acetate latex, methyl methacrylate resins, methyl methacrylate latex, acrylic resins, acrylic latex, vinylacrylic resins, vinylacrylic latex, vinyl-versatate resins, vinyl-versatate latex, styrenic resins, styrenic latex, styrene-acrylic resins, styrene-acrylic latex, linseed oil resins, rapeseed oil resins and combinations thereof.

7. Composition R according to any one of claims 1 to 6, preferably an ink composition, varnish composition, adhesive composition, paint composition, for example decorative paint or industrial paint, comprising: - from 0.1% to 4% by dry weight of polymer P, - from 3% to 65% by dry weight of pigment Q, - 9.9% to 15% by dry weight of binding agent B, - from 19.9% ​​to 88% water by weight; or comprising: - from 0.1% to 4% by dry weight of polymer P, - 3% to 30% by dry weight of pigment Q, - from 5% to 70% by dry weight of binding agent B, - from 26.9% to 82.9% water by weight; and possibly comprising at least one agent selected from a particle spacer, a steric stabilizer, an electrostatic stabilizer, an opacifying agent, a coloring agent, a dispersing agent other than polymer P, a solvent, a coalescing agent, an antifoaming agent, a preservative, a biocidal agent, a spreading agent, a thickening agent, a film-forming copolymer and mixtures thereof.

8. Method of preparing an aqueous composition R according to any one of claims 1 to 7, comprising mixing in water and under stirring: - of at least one water-soluble polymer P, of at least one organic, organometallic or mineral pigment Q and - of at least one binding agent B.

9. Method for controlling the viscosity of a composition R according to any one of claims 1 to 7 comprising the addition of at least one polymer P in an aqueous composition comprising at least one organic, organometallic or mineral pigment Q and at least one binding agent B.

10. Aqueous agent G comprising at least one polymer P for controlling the viscosity of an aqueous composition R according to any one of claims 1 to 7.

11. Aqueous agent G according to claim 10 also comprising at least one solvent, in particular a coalescing solvent, for example glycol, butyl glycol, butyldiglycol, monopropylene glycol, ethylene glycol, ethylenediglycol, "Dowanol" products of CAS number 34590-94-8, "Texanol" products of CAS number 25265-77-4; or combined with at least one additive selected from an amphiphilic compound, in particular a surfactant compound, preferably a hydroxylated surfactant compound, for example alkyl-polyalkylene glycol, in particular alkyl-polyethylene glycol and alkyl-polypropylene glycol; a polysaccharide derivative, for example cyclodextrin, cyclodextrin derivative, polyethers, alkyl-glucosides; a hydrotropic compound, an antifoaming agent, a biocidal agent and combinations thereof.

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