Patent ID: 7408004

Claim:
Water-soluble polymer dispersion comprising: a dispersed polymer made up of: from about 50 to about 99 mole % of at least one water-soluble monomer A and from about 1 to about 50 mole % of at least one water-soluble cationic monomer B, from about 0.05 to about 10 weight % of at least one copolymer as polymer stabiliser C, from about 1 to about 25 weight % of at least one cationic polyelectrolyte as co-stabiliser D, relative respectively to the total mass of the dispersion, the polymer dispersion having no substantial amount of an inorganic polyvalent anion salt present, wherein the polymer stabiliser C is a copolymer comprising: at least one monomer, selected from the group diallyldimethylammonium chloride (DADMAC), vinylpyridinium chloride, N-vinylimidazoline chloride, vinylbenzyltrimethylammonium chloride and mixtures thereof, and/or compounds of the general formula II, and at least one of compounds of the general formulas III, IV or V, wherein (i) general formula II is with R 1 =H, or methyl, R 3 , R 4 , R 5 =independently of each other H, alkyl (C 1 -C 8 ), benzyl, or alkylbenzyl A=NH, O, B=alkyl (C 1 -C 10 ) or hydroxyalkyl (C 1 -C 10 ), X − =an anionic counterion (ii) general formula III is a monofunctionally allyl-terminal polyether: with R 1 =H, or methyl, R 6 =independently of each other H, methyl, or ethyl, n=1 or 3, x=5 to 50, and y=5 to 50, (iii) general formula IV is a macroinitiator: with R 1 =H, or methyl, R 6 =independently of each other H, methyl, or ethyl, R 7 , R 8 =independently of each other alkyl, cyanoalkyl, carbalkoxyalkyl, (C 1 -C 8 ), n=1 or 3 and x=5 to 100, and (iv) general formula V is a monofunctionally vinyl-terminal polyether: with R 1 =H, or methyl, R 6 =H, methyl, or ethyl, n=1 or 3 and x=5 to 50.