Patent ID: 7834079
Filing Date: 2010-11-16
Classification: C08F

Abstract:
1. A water soluble anionic polymer dispersion, comprising: a radical copolymer created in salt water which includes anionic monomer, non-ionic monomer, ionic dispersant, radical polymerization initiator, and anionic surfactant or non-ionic surfactant; wherein the anionic monomer is more than one selected from the group consisting of (meta)acrylic acid, 2-acrylamide-2-methylpropane sulfonic acid, itaconic acid, maleic acid, fumaric acid, vinyl sulfonic acid, and styrenesulfonic acid, or its salt; wherein the non-ionic monomer is more than one selected from the group consisting of (meta)acryl amide, N,N-dimethylacrylamide, N-isopropylacrylamide, N-butylacrylamide and N-methylacrylamide; wherein the anionic surfactant, if present, is more than one selected from the group consisting of polycarboxylic acid or its salt, carboxymethyl cellulose sodium salt, carboxymethyl cellulose ammonium salt, and sodium alginate; and the non-ionic surfactant, if present, is more than one selected from the group consisting of polyoxyethyleneglycolether, polyoxyethylene, polyoxypropyleneglycolether, polyoxyethylene-alkylphenyl-ether, polyoxyethylenealkylether, naphthylpolyoxyethyleneether, and polyoxyethylene-lanolinalcoholether; wherein the water soluble anionic polymer dispersion has a pH of 5-8.5 before polymerization when all ingredients are mixed and does not include a cationic monomer.