Patent ID: 9079797
Filing Date: 2015-07-14
Classification: C04B,C08F,C09D

Abstract:
1. A production method for a polycarboxylic acid-based copolymer comprising: polymerizing monomer components including an unsaturated polyalkene glycol ether based monomer (a) and an unsaturated monocarboxylic acid-based monomer (b) using a peroxide and a reductant as polymerization initiators in combination while a pH during polymerization is controlled to 3 or less in a presence of a pH adjustor; monomer (a) being represented by the general formula (1): [Chem 1] where: Y represents a 3-methyl-3-butenyl group; T represents an alkylene group having 1 to 5 carbon atoms or an aryl group having 6 to 9 carbon atoms; R monomer (b) represented by the general formula (2): where: R wherein the carboxylic acid-based copolymer comprises a structural unit (I) derived from monomer (a) and a structural unit (II) derived from monomer (b); and wherein the polycarboxylic acid-based copolymer does not include a structural unit derived from an unsaturated dicarboxylic acid-based monomer.