Patent ID: 6107397
Filing Date: 2000-08-22
Classification: A61K,C08F

Abstract:
A process for preparing an aqueous copolymer dispersion by free-radical aqueous emulsion polymerization of ethylenically unsaturated monomers which process comprises reacting a monomer mixture ofi) more than 20% and up to 60% by weight of at least one nonionic monomer A having a water-solubility of more than 60 g/l at 25.degree. C., and being selected from the group consisting of N-vinyllactams having from 6 to 8 carbon atoms, N-vinylformamide and N-methyl-N-vinylacetamide,ii) from 40 to 80% by weight of at least one monoethylenically unsaturated hydrophobic monomer B having a water-solubility of less than 60 g/l at 25.degree. C.,in the presence of a water-soluble polymerization initiator, said process being conducted as an emulsion polymerization in water or in a mixture of water and at least one C.sub.1 -C.sub.4 -alcohol, the alcohol being present in up to 20% by weight.