Patent ID: 7297733

Claim:
A process for the preparation of aqueous dispersions of water-soluble polymers of N-vinylformamide and/or of N-vinylacetamide, comprising: subjecting to free radical polymerization: (A) from 5 to 80 parts by weight of N-vinylformamide and/or N-vinylacetamide, if desired together with other monoethylenically unsaturated monomers, which form water-soluble polymers therewith; and (B) from 1 to 50 parts by weight of at least one polymeric dispersant which is selected from the group comprising carboxymethylcellulose, water-soluble starch, starch esters, starch xanthogenates, starch acetates, dextran, polyalkylene glycols, polyvinyl acetate, polyvinyl alcohol, polyvinylpyrrolidone, polyvinylpyridine, polyethyleneimine, polyvinylimidazole, polyvinylsuccinimide and polydiallyldimethylammonium chloride; in 100 parts by weight of water; wherein: the free radical polymerization is carried out at a temperature of from 30 to 95° C; the free radical polymerization is carried out in the presence of from 0.00 1 to 5.0% by weight, based on the monomers used, of polymerization initiators which form free radicals under the polymerization conditions; and the free radical polymerization is carried out under conditions that provide water soluble polymers having a particle size of from 1 to 10 μm.