Patent ID: 6130303
Filing Date: 2000-10-10
Classification: C02F,C08F,Y10T

Abstract:
Highly branched, water-soluble, high molecular weight cationic or anionic polymeric microparticles wherein said microparticles have an average unswollen diameter of less than about 0.1 micron, a solution viscosity of at least about 2.0 mPa.s and having a methylenebisacrylamide content of from 2 to 80 molar parts per million based on the monomeric units present in the polymer, said microparticles having a solubility quotient greater than about 30 percent, said polymer being comprised of an acrylamide and a comonomer selected from the group consisting of diallyldimethylammonium chloride; acryloxyethyl trimethylammonium chloride; quaternaries of N,N-dialkylaminoalkyl (meth)acrylamides; (meth)acrylamidopropyltrimethylammonium chloride; (meth)acrylic acid, styrene sulfonic acid; itaconic acid; 2-acrylamido-2-methylpropanesulfonic acid; sulfoalkyl(meth)acrylic acid; salts of the above acids and sulfomethylated (meth)acrylamides.