Patent ID: 8741999

Claim:
Water-soluble polymer dispersion comprising: a dispersed polymer (A) of one or more water-soluble anionic monomers (m 1 ) and one or more non-ionic vinyl monomers (m 2 ); a polymeric stabiliser (B); and a polymeric co-stabiliser (C), wherein the polymeric stabiliser (B) and the polymeric co-stabiliser (C) are made of different monomers; wherein the polymeric dispersion comprises an amount of inorganic salt of from 0 to about 0.5 weight % based on the total weight of the dispersion, wherein the one or more water-soluble anionic monomers (m 1 ) is selected from the group consisting of acrylic acid, methacrylic acid, (styrene sulphonic acid), 2-acrylamido-2-methyl-1-propane sulphonic acid (AMPS), 2-acrylamido-2-methyl-1-butane sulphonic acid (AMBS), acryloyloxyethyl sulphonic acid, methacryloyloxyethyl sulphonic acid, acryloyloxypropyl sulphonic acid, methacryloyloxypropyl sulphonic acid, vinyl sulphonic acid, and their alkali, earth alkali or ammonium salts, wherein the one or more non-ionic monomers (m 2 ) is selected from the group consisting of acrylamide, methacrylamide, N-methylacrylamide, N-methylmethacrylamide, N-ethylacrylamide, N-ethylmethacrylamide, N-isopropylacrylamide, N-isopropylmethacrylamide, N,N-dimethylacrylamide, N-t-butylacrylamide, N-t-butylmethacrylamide, N-hydroxyethylacrylamide, N-(tris-(hydroxymethyl)-methyl)-acrylamide, N-vinyl formamide, N-vinyl acetamide, hydroxyalkylacrylate or hydroxyalkylmethacrylate with C2-C4 alkyl, alkylacrylate or alkylmethacrylate with C1-C4 alkyl, benzylacrylate or benzylmethacrylate, esters of acrylic or methacrylic acid with dihydroxy-(polyethylene oxide) having 1-20 ethylene oxide units, and esters of acrylic or methacrylic acid with monomethoxyhydroxy-(polyethylene oxide) having 1-20 ethylene oxide units; and wherein the dispersion is free from dextrin or dextrin derivative.