Patent ID: 6398967
Filing Date: 2002-06-04
Classification: C02F,C08F

Abstract:
A method of clarifying water containing dispersed solids comprising adding to the water an effective clarifying amount of a low molecular weight water-soluble cationic dispersion terpolymer prepared by polymerizing dimethylaminoethylacrylate methyl chloride salt, dimethylaminoethylacrylate benzyl chloride salt, acrylamide one or more chain transfer agents under free radical forming conditions in an aqueous solution of an anionic salt in the presence of a stabilizer polymer, wherein the cationic dispersion has a cationic charge of about 35 mole percent to about 75 mole percent and an RSV of from about 0.5 dl/g to about 6 dl/g and wherein the cationic terpolymer contains at least about 15 mole percent dimethylaminoethylacrylate benzyl chloride salt to coagulate said dispersed solids, and separating the coagulated solids from a clarified water.