Stereoregulated copolymers of butadiene and piperylene

Details Stereoregulated copolymers of butadiene and piperylene Stereoregulated copolymers of butadiene and piperylene

C - Chemistry, Metallurgy

08

F

402/426, 402/430

C08F 236/04 (2006.01) C08F 4/44 (2006.01) C08F 236/06 (2006.01)

Patent

CA 1066848

ABSTRACT OF THE DISCLOSURE Elastomeric copolymers of butadiene and piperylene containing at least 50 mole percent butadiene and having a random distribution of monomer units enchained in a stereroregulated manner are characterised by, (1) vinyl unsaturation pendant to the main polymer chain which is equal to or less than 10 percent of the total unsaturation present in the polymer; (2) enchainment of at least 95 percent of the piperylene as the 1,2-trans and 1,4-trans- sterecisomers; and (3) selective enchainment of between 50 and 95 percent of the butadiene as the 1,4-trans-stereoisomer. The copolymers, prepared with the aid of hydrocarbon-soluble catalyst system comprising TiXn-n?In-yI2-zAlR3-QLB, have excellent com- pounding characteristics and vulcanization properties. The vulcanized polymers posses a high abrasion resistance and are particularly useful in automotive tire-tread compositions.

229964

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