Patent ID: 6608159
Filing Date: 2003-08-19
Classification: C09K

Abstract:
A polymeric, acrylamide-free water retention agent based on vinylic sulfonic acids, composed of1) &gE;30 mol % of component A which is selected from the group consisting of a) vinylic substituted sulfonic acid of the series 2-acrylamido-2-methyipropanesulfonic acid (AMPS), vinylsulfonic acid, methallylsulfonic acid, styrenesulfonic acid, salts thereof with a valence of at least 1, or mixtures thereof, or b) a divalent salt of homopolymers or copolymers of a vinylic substituted sulfonic acid of the series 2-acrylamido-2-methylpropanesulfonic acid (AMPS), vinylsulfonic acid, methallylsulfonic acid, styrenesulfonic acid or mixtures thereof; and in case 1 a) 2) component B), composed of a) from 4.99 to 60 mol % of an unsaturated polybasic, cis-positioned, carboxylic acid monomer and b) from 0.01 to 10 mol % of a monomer having a polyalkylene oxide side chain which contains from 1 to 120 repeating units of the alkylene oxide.