Patent ID: 8658741
Filing Date: 2014-02-25
Classification: C08F,C08G,C09D

Abstract:
1. A process for the preparation of a modified block copolymer comprising the steps a1) polymerizing in a first step ethylenically unsaturated monomers in the presence of at least one nitroxylether having the structural element a2) polymerizing in a first step ethylenically unsaturated monomers in the presence of at least one stable free nitroxyl radical and a free radical initiator; and in a second step b) modifying the block copolymer prepared under a1) or a2) by a transesterification reaction with a mono alcohol derived from ethylenoxide, propylenoxide or mixtures thereof with up to 100 C atoms, wherein a1) or a2) is carried out in two radical polymerization steps to form a block copolymer wherein in the first polymerization step the monomers are C