Maruzen Petrochemical Company, Limited

Yoko Furuyama

Hiroshi Yamazaki

Toshifumi Takemori

Shigeharu Yamamoto

Kazuhiko Mizuno

Sakae Kamiyama

Yoji Suzuki

An olefinic copolymer having a cyclic structure is prepared by copolymerizing a) ethylene (M1) and b) dicyclopentadiene or tricyclopentadiene (M2), and, optionally c) a cyclic olefin (M3), in the presence of a catalyst which contains a metallocene compound (A) having formula &lsqb;1&rsqb;: H C(R&prime; Cp)(R&Prime; Cp)MX &lsqb;1&rsqb;, wherein M is zirconium or hafnium, Cp has a cyclopentadienyl skeleton, each of R&prime; and R&Prime; is a hydrocarbon group having 1 to 10 carbon atoms, each of two X's which may be the same or different from each other, is a halogen, a hydrogen, a hydrocarbon group having 1 to 20 carbon atoms, a halogenated hydrocarbon group, an alkylamino group, an alkoxy group, an aryloxy group of the formula &mdash;O&mdash;Ar&mdash;Y , a thioalkyl group, or a thioaryl group of the formula &mdash;S&mdash;Ar&mdash;Y ; wherein Ar is an aromatic ring, Y is a halogen, a hydrogen, a hydrocarbon group having 1 to 20 carbon atoms, a halogenated hydrocarbon group, an alkoxy group, an alkylamino group, a cyano group or a nitro group, and p is an integer of from 1 to 5, and each of m and n is an integer of from 0 to 4, provided that m and n are not equal, and m&plus;n is an integer of from 3 to 6, and an aluminoxane (B), is used.

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Chiba, Japan

Yoko Furuyama