AB BLOCK COPOLYMERS BASED ON BUTADIENE,ISOPRENE AND STYRENE,MANUFACTURE AND USE

摘要

The AB block copolymers of the prior art generally have a damping curve having a relatively narrow damping range and can only be prepared in a relatively complex manner. In practice, this is regarded as disadvantageous. …The block copolymers according to the invention comprise… 30 to 90% of a block A and… 70 to 10% of a block B whose mean vinyl and isopropenyl group contents are each at least 30% higher than those of block A.… These block copolymers have a damping curve of varying width, depending on the point in time of addition of the cocatalyst. …Use of the AB block copolymers for the production of tyre treads. ……