A process for converting a solid (meth)acrylate copolymer into a dispersed form by preparing an aqueous dispersion comprising the components (a) a (meth)acrylate copolymer which is composed of free-radical polymerized methyl methacrylate, ethylacrylate and a salt of 2-trimethylammoniumethyl methacrylate, present in solid form as a powder or as a granulate, where the (meth)acrylate copolymer is composed 50 to 70% by weight of methyl methacrylate, 20 to 40% by weight of ethyl acrylate and 7 to 2% by weight of a salt of 2 trimethylammoniumethyl methacrylate, wherein the weight percentages add up to 100 % or the (meth)acrylate copolymer is composed 50 to 70% by weight of methyl methacrylate, 20 to 40% by weight of ethyl acrylate and more than 7 up to 12% by weight of a salt of 2 trimethylammoniumethyl methacrylate, wherein the weight percentages add up to 100 %, (b) up to 50 % by weight calculated on the (meth)acrylate copolymer (a) of a dispersing agent selected from the groups of (b) i) plasticizers in combination with emulsifiers and/or (b) ii) selected from one or more of the groups consisting of (b) ii - i) fatty alcohols having 6 to 18 carbon atoms, (b) ii - ii) water soluble salts of saturated or unsaturated carboxylic acids having 6 to 18 carbon atoms, (b) ii - iii) unsubstituted mono carboxylic acids having 6 to 18 carbon atoms, (b) ii - iv) hydroxycarboxylic acids having 6 to 18 carbon atoms. (c) water by mixing the components (a), (b) and (c) to give a suspension which becomes an aqueous dispersion during the conversion of the solid (meth)acrylate copolymer into the dispersed form, where the plasticizer in respect to component (b) is selected from the group consisting of alkyl citrates, alkyl phthalates, alkyl sebacates, polyethylene glycols or mixtures thereof and the emulsifier in respect to component (b) is selected from the group consisting of fatty alkyl sulfates, saccharose stearate, polysorbates or mixtures thereof or from sodium salts of fatty alcohol sulfates, sulfosuccinates, partial esters of fatty acids of polyvalent alcohols, partial esters of fatty acids of sorbitane, partial esters of fatty acids of polyhydroxy ethylen sorbitan (mono-ester), ethers of fatty alcohols and polyhydroxyethylene, esters of fatty acids and polyhydroxyethylene or blockcopolymers of ethylene oxide and propylene oxide, characterized in that, the (meth)acrylate copolymer is converted into the dispersed form by means of the presence of the dispersing agent at a temperature below 45 °C. (a) a (meth)acrylate copolymer which is composed of free-radical polymerized methyl methacrylate, ethylacrylate and a salt of 2-trimethylammoniumethyl methacrylate, present in solid form as a powder or as a granulate, where the (meth)acrylate copolymer is composed 50 to 70% by weight of methyl methacrylate, 20 to 40% by weight of ethyl acrylate and 7 to 2% by weight of a salt of 2 trimethylammoniumethyl methacrylate, wherein the weight percentages add up to 100 % or the (meth)acrylate copolymer is composed 50 to 70% by weight of methyl methacrylate, 20 to 40% by weight of ethyl acrylate and more than 7 up to 12% by weight of a salt of 2 trimethylammoniumethyl methacrylate, wherein the weight percentages add up to 100 %, (b) up to 50 % by weight calculated on the (meth)acrylate copolymer (a) of a dispersing agent selected from the groups of (b) i) plasticizers in combination with emulsifiers and/or (b) ii) selected from one or more of the groups consisting of (b) ii - i) fatty alcohols having 6 to 18 carbon atoms, (b) ii - ii) water soluble salts of saturated or unsaturated carboxylic acids having 6 to 18 carbon atoms, (b) ii - iii) unsubstituted mono carboxylic acids having 6 to 18 carbon atoms, (b) ii - iv) hydroxycarboxylic acids having 6 to 18 carbon atoms. (b) i) plasticizers in combination with emulsifiers and/or (b) ii) selected from one or more of the groups consisting of (b) ii - i) fatty alcohols having 6 to 18 carbon atoms, (b) ii - ii) water soluble salts of saturated or unsaturated carboxylic acids having 6 to 18 carbon atoms, (b) ii - iii) unsubstituted mono carboxylic acids having 6 to 18 carbon atoms, (b) ii - iv) hydroxycarboxylic acids having 6 to 18 carbon atoms. (b) ii - i) fatty alcohols having 6 to 18 carbon atoms, (b) ii - ii) water soluble salts of saturated or unsaturated carboxylic acids having 6 to 18 carbon atoms, (b) ii - iii) unsubstituted mono carboxylic acids having 6 to 18 carbon atoms, (b) ii - iv) hydroxycarboxylic acids having 6 to 18 carbon atoms. (c) water