AB BLOCK COPOLYMERS BASED ON BUTADIENE, ISOPRENE AND STYRENE, PROCESS FOR THEIR PREPARATION AND THEIR USE

摘要

AB block copolymers on the basis of butadiene, isoprene and styrene are produced by anionic polymerisation. The block copolymers are composed of 40 to 75% of a block A based on butadiene (uniformly distributed vinyl group content 8 - 60%) 60 to 20% of a block B based on 0 - 60% butadiene, at least 10% isoprene, and 0 to 45% styrene, wherein the vinyl content of the diene units is 75 to 90%. These block copolymers exhibit a substantially broadened damping curve and are useful for the manufacture of tyre treads.