Patent ID: 7851544
Filing Date: 2010-12-14
Classification: C08F,C08L,C09C,C09D

Abstract:
1. A copolymer comprising three segments of different ion density, the fraction of the ionic monomers in each segment being from 1 to 100 mol %, the second and third segment containing ethylenically unsaturated monomers of the respective preceding segment, and the copolymers being the result of an NMP or RAFT polymerization with a monofunctional initiator, wherein the polymerization of the first segment takes place up to a degree of conversion of 10 to 95 mol % of the monomer or monomer mixture employed, the polymerization of the second segment onto the first segment takes place with inclusion into the second segment of the unreacted monomers of the first segment and with inclusion of a monomer or monomer mixture which differs from the monomer or monomer mixture of the first segment at least in the amount of ionic monomers or ionic monomer precursors employed, the polymerization of the second segment taking place up to a degree of conversion of 10 to 95 mol % of the monomers available for reaction, and the polymerization of the third segment onto the second segment takes place with inclusion into the third segment of the unreacted monomers of the second segment and, where appropriate, of unreacted monomers of the first segment and with inclusion of a monomer or monomer mixture which differs from the monomer or monomer mixture of the second segment at least in the amount of ionic monomers or ionic monomer precursors employed, and the ionic monomer precursors, where used, are converted wholly or partly into ionic monomers.