Patent ID: 6265477
Filing Date: 2001-07-24
Classification: C08F,C08K

Abstract:
An aqueous dispersion of a particulate high molecular weight water soluble anionic or nonionic polymer, wherein the dispersion has a bulk Brookfield viscosity of from about 10 to about 25,000 cps at 25.degree. C. and comprises from about 5 to about 50 weight percent of the water soluble polymer, wherein the water soluble polymer is prepared by polymerizing under free radical forming conditions in an aqueous solution of a water-soluble salt in the presence of a stabilizer at a pH greater than 5:i. 0-7 mole percent of at least one anionic monomer, and,ii. 100-93 mole percent of at least one non-ionic monomer; and wherein the stabilizer is an anionic water soluble polymer containing from about 1.25 to about 20 mole percent 2-acrylamido-2-methyl-1-propanesulfonic acid, has an intrinsic viscosity in 1M NaNO.sub.3 of from about 0.1-10 and comprises from about 0.1 to about 5 weight percent based on the total weight of the dispersion, and the water soluble salt is selected from the group consisting of ammonium, alkali metal and alkaline earth metal halides, sulfates, and phosphates and comprises from about 5 to about 40 weight percent based on the weight of the dispersion.