Patent ID: 7732528
Filing Date: 2010-06-08
Classification: C08F

Abstract:
1. A water-absorbent crosslinked polymer particle comprising a) at least one copolymerized ethylenically unsaturated monomer bearing acid groups, some or all of the acid groups being present as carboxylate groups having at least two different types of metallic monovalent cations as counterions, b) at least one copolymerized crosslinker, c) optionally one or more copolymerized ethylenically and/or allylically unsaturated monomer copolymerizable with a) and d) optionally one or more water-soluble polymer onto which the monomers a), b), and optional c) are at least partly grafted, wherein said cations are homogenously distributed in said dry crosslinked polymer particle and the acid groups of the copolymerized ethylenically unsaturated monomers are neutralized to an extent in the range from 40 to 90 mol %, and wherein the water-absorbent crosslinked particles comprise 0% to 20%, by weight, water.