Patent ID: 6365672
Filing Date: 2002-04-02
Classification: A61K,A61Q,C08G

Abstract:
A process for making a polysiloxane block copolymer which is built up from units of the formula [A]L[B], in which A is a polymeric block built up from radically polymerisable monomer, B is a polysiloxane block, and L is a divalent linker group, the process comprising the steps of polymerising a radically polymerisable monomer in the presence of an atom transfer radical initiator to form a polymer which is end-functionalised with a leaving group capable of nucleophilic substitution by a nucleophilic end-group comprising an atom selected from the group consisting of oxygen, nitrogen, and sulfur on a polysiloxane, having said nucleophilic end-groups so that a polysiloxane block copolymer is formed via a nucleophilic displacement reaction between the end-groups on the polysiloxane and leaving groups on the polymer respectively.