Patent ID: 6239226
Filing Date: 2001-05-29
Classification: C08F

Abstract:
A process for producing a triblock copolymer having the structure A--B--A or B--A--B, wherein each of blocks A and B has a weight average molecular weight of from 1,000 to 250,000 which consists essentially of polymerizing at least one monomerA) selected from the group consisting of styrene, .alpha.-methylstyrene, acrylonitrile, methacrylonitrile, methyl methacrylate and maleic anhydride to form blocks A having a glass transition temperature Tg of more than 0.degree. C. and at least one monomerB) selected from the group consisting of n-butyl acrylate and 2-ethylhexyl acrylate to form blocks B having a glass transition temperature Tg of less than 0.degree. C. at from 100 to 160.degree. C. at pressures up to 30 bar in which blocks A and B are both produced in the presence of free-radical initiators and N-oxyl radicals.