Patent ID: 8673275
Filing Date: 2014-03-18
Classification: A61K,A61P,A61Q,C08L

Abstract:
1. A process for the preparation of a copolymer composition CP) by free-radical copolymerization of a monomer composition comprising a) 70 to 100% by weight, based on the total weight of the monomers used for the polymerization, of acrylic acid, b) 0 to 30% by weight, based on the total weight of the monomers used for the polymerization, of at least one hydrophilic nonionic compound, different from a), having a free-radically polymerizable, α,β-ethylenically unsaturated double bond, c) 0 to 1% by weight, based on the total weight of the monomers used for the polymerization, of at least one free-radically polymerizable crosslinking compound which comprises at least two α,β-ethylenically unsaturated double bonds per molecule, by the method of precipitation polymerization in the presence of an auxiliary composition H) comprising H1) at least one compound with a block structure which comprises at least one hydrophobic group and at least one hydrophilic group, and is H2) at least one basic compound different from H1).