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

摘要

The AB block copolymers of the prior art have a tan delta curve having a comparatively narrow attenuation region. In order to obtain tyre treads having an optimum performance profile, these known block copolymers must be blended with other rubbers having certain glass transition temperatures, which is in practice regarded as disadvantageous. …The block copolymers according to the invention comprise from 40 to 80% of a block A based on butadiene (uniformly distributed vinyl group content 8-60%) and from 60 to 20% of a block B based on… - 0-60% of butadiene,… - at least 10% of isoprene and… - up to 45% of styrene,… the vinyl content of the diene units being from 75 to 90%. …These block copolymers have a considerably broadened attenuation curve. …The AB block copolymers are used to produce tyre treads.