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

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...

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Bibliographische Detailangaben
Hauptverfasser:	WALTER HELLERMANN, HANS-BERND FUCHS, CHRISTOPH HERMMAN, KARL-HEINZ NORDSIEK, JURGEN WOLPERS
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON DEVICES OR ARRANGEMENTS RELATED TO TYRES MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIESIN GENERAL THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING TYRE CHANGING OR REPAIRING TYRE INFLATION VEHICLE TYRES VEHICLES IN GENERAL
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Beschreibung
Zusammenfassung:	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.