Process for preparing AB diblock copolymers with a broadly distributed A block

摘要

The invention relates to a controlled polymerization process for preparing (meth)acrylate-based AB diblock copolymers with a B block which has a narrow monomodal molecular weight distribution, and an A block which has a broad monomodal molecular weight distribution, and to the use thereof, for example, as a binder in adhesives or sealants.

主权项

1. A process for preparing a block copolymer by a sequentially implemented atom transfer radical polymerization (ATRP), the processing comprising:
(A) adding a monofunctional initiator for initiating the reaction to a polymerization solution in a first portion; and, thereafter; (B) continuously adding a second portion of the monofunctional initiator, to obtain the block copolymer; wherein the block copolymer, which has an AB composition, has an overall molecular weight distribution with a polydispersity index of greater than 1.8, wherein block A is a copolymer having a monomodal molecular weight distribution with a polydispersity index of greater than 1.8, and comprises at least one (meth)acrylate, and wherein block B is a copolymer having a monomodal molecular weight distribution comprising at least one (meth)acrylate, and wherein the block copolymer has an overall polydispersity index of greater than 1.8.