Patent ID: 7868098
Filing Date: 2011-01-11
Classification: C08F,C08L,C09J,Y10S

Abstract:
1. A process for preparing a block copolymer composition, ABA, comprising sequentially: polymerizing by atom transfer radical polymerization (ATRP) monomers, comprising monomers selected from the group consisting of a (meth)acrylate and a mixture of (meth)acrylates, with the proviso that no monomer has additional olefinic functionality, to obtain block B, and then polymerizing by atom transfer radical polymerization (ATRP), monomers, comprising monomers selected from the group consisting of a methacrylate, an olefinically functionalized (meth)acrylate and a mixture of a methacrylate and an olefinically functionalized (meth)acrylate, to obtain blocks A which each comprise from 1 to ≦4 olefinic groups, wherein each polymerizing reaction is in the presence of an initiator and of a catalyst in a halogen-free solvent, the initiator for the polymerizing to obtain the B block is a bifunctional initiator, and a molecular weight of the ABA block copolymer is between 5000 g/mol and 25 000 g/mol.