Patent ID: 8536278
Filing Date: 2013-09-17
Classification: A61L,C08J

Abstract:
1. A process for surface postcrosslinking water-absorbing polymer particles which are obtained by polymerizing a monomer solution or suspension comprising a) at least one ethylenically unsaturated monomer bearing an acid group, b) at least one crosslinker, c) at least one initiator, d) optionally one or more ethylenically unsaturated monomer copolymerizable with the monomer mentioned under a), and e) optionally one or more water-soluble polymer, at least one surface postcrosslinker is applied to the water-absorbing polymer particles and the water-absorbing polymer particles are thermally surface postcrosslinked, wherein the surface postcrosslinker comprises at least one ester of an ethylenically unsaturated carboxylic acid having at least 10 carbon atoms and/or epoxidation product thereof, wherein the ester of the ethylenically unsaturated carboxylic acid is a vegetable oil and/or animal oil, wherein a proportion of the ethylenically unsaturated carboxylic acid is at least 30% by weight based on the total amount of carboxylic acids in the vegetable oil and/or animal oil.