process for making a low-vinyl block copolymer composition, copulated, and a low-vinyl block copolymer composition, copulated

摘要

PROCESS TO MANUFACTURE A COMPOSITION OF LOW CONTENT COPULYMER, COPULATED, AND LOW CONTENT COPOLYMER, COPULATED. The invention relates to a process for making a copulated low-vinyl block copolymer composition having a vinyl content of less than 15%, comprising the steps of: a) reacting a living lithium-terminated polymer having wherein P is a copolymer chain having at least one polymer A block composed of one or more mono alkenyl arenes having 8 to 18 carbon atoms and at least one polymer B block composed of one or more conjugated dienes having 4 to 12 carbon atoms, with an alkyltrialkoxysilane copulating agent having the formula R-Si (OR 3) -3-, where R is selected from branched alkyl radicals having from 3 to 12 carbon atoms, and R? is a methyl group, and where the molar ratio of Si to Li is between 0.3 and 1.0, thus forming a copulated block copolymer composition; and b) recovering the resulting low vinyl copulated block copolymer composition. The invention also relates to resulting low-vinyl copulated block copolymer compositions which are free of bromine-containing contaminants.