Ab block copolymers based on butadiene, isoprene and...

Details Ab block copolymers based on butadiene, isoprene and... Ab block copolymers based on butadiene, isoprene and...

C - Chemistry, Metallurgy

08

F

400/2032

C08F 297/04 (2006.01) B60C 1/00 (2006.01)

Patent

CA 1324849

ABSTRACT AB block copolymers on the basis of butadiene (20 to 75%), isoprene (5 to 50%) and styrene (3 to 30%), process for their manufacture and their use are disclosed. The block copolymers according to the invention are composed of 30 to 90% of a block A and 70 to 10% of a block B, wherein each of the two blocks contains all three monomers. The mean vinyl and isopropenyl content of the block B is each at least 30% higher than that of block A. These block copolymers which can be manufactured in a simple process, exhibit a more or less broad damping curve, depending on the particularities of the process, and are useful in the manufacture of tyre treads.

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