Patent ID: 7291682
Filing Date: 2007-11-06
Classification: C08F,C08G,C08L

Abstract:
1. A method for the preparation of a comb or star copolymer, said method comprising a) polymerizing in a first step, two or more epoxy group containing monomers to obtain a polyether, wherein at least one monomer is of formula (II) wherein R R R′ R R R C phenyl, C —C(O)—C —SO R R R R R R and at least one monomer is an epoxy group containing monomer different from formula (II); where the weight ratio of the monomer of formula (II) to the sum of the other monomers is from 99:1 to 1:99; and in a second step b) adding to the polymer obtained in step a) at least one ethylenically unsaturated monomer or oligomer, heating the resulting mixture to a temperature where cleavage of the nitroxylether bond occurs and radical polymerization starts; and polymerizing to the desired degree.