Patent ID: 8540974

Claim:
An aqueous dispersion comprising water-soluble and/or water-swellable anionic polymers of ethylenically unsaturated, anionic monomers; an aqueous medium; and a stabilizer comprising: (a) at least one water-soluble polymer selected from the groups consisting of graft polymers of vinyl acetate and/or vinyl propionate on (i) polyethylene glycols or (ii) polyethylene glycols or polypropylene glycols blocked at one or both terminal groups with alkyl, carboxyl or amino groups, polyalkylene glycols, polyalkylene glycols blocked at one or both terminal groups with alkyl, carboxyl or amino groups and (b) at least one water-soluble copolymer comprising (b1) nonionic monoethylenically unsaturated monomers, (b2) cationic monoethylenically unsaturated monomers and optionally (b3) anionic monoethylenically unsaturated monomers, the fraction of the interpolymerized cationic monomers being greater than that of the anionic monomers.