Japan Synthetic Rubber Co., Ltd.

Hideo Katsumata

Kenya Makino

Takashi Kawata

Yasuhiko Takemura

Toshio Teramoto

Kunio Goshima

Yoshiharu Hashiguchi

Yoshishige Chikatsu

A hydrogenation catalyst composition comprising, as essential components, (a) at least one bis(cyclopentadienyl)transition metal compound represented by general formula (i): ##STR1## and (b) at least one member selected from the group consisting of complex compounds represented by general formulas (ii) and (iii): ##STR2## and further comprising, if necessary, (c) at least one polar compound selected from the group consisting of ether compounds, thioether compounds, ketone compounds, sulfoxide compounds, carboxylic acid ester compounds, lactone compounds, amine compounds, amide compounds, nitrile compounds and oxime compounds and/or (d) an alkali compound represented by general formula (iv):

Hydrogenation catalyst composition and process for hydrogenating

A hexene-1/4 methylpentene-1 random copolymer composed of 65 to 90% by weight of hexene-1 unit and 35 to 10% by weight of 4-methylpentene-1 unit and having a polystyrene-reduced number average molecular weight of 20,000 to 500,000, which copolymer is useful in applications as rubber vibration insulators, modifiers for plastics and rubbers and adhesives. Said random copolymer is produced by copolymerizing 60 to 95% by weight of hexene-1 with 40 to 50% by weight of 4-methylpentene-1 in the presence of a Ziegler-Natta catalyst comprising a transition metal component and an organometal compound component.

Hexene-1/4-methylpentene-1 random copolymer and process for producing

A vibration-damping rubber composition comprising:

Vibration-damping rubber composition

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Yokkaichi, Japan

Hideo Katsumata