Mitsui Petrochemical Industries, Ltd.

Tatsuyoshi Ishida

Toshiyuki Tsutsui

Toshihiro Sagane

Noriaki Kihara

Masaaki Yasuda

Masaaki Kawasaki

Hidenari Nakahama

Hitoshi Onishi

Keiichi Yokoyama

Takumi Kitahara

Katsuya Takahashi

Shigeru Isayama

Yoshiaki Furuya

Hitoshi Ohnishi

Kohji Kato

Chain polyene group-containing norbornene compound and unsaturated

A novel unsaturated copolymer of ethylene comprises a random copolymer of (i) ethylene, (ii) an .alpha.-olefin of 3 to 20 carbon atoms and (iii) at least one straight chain or branched chain nonconjugated triene or tetraene having one vinyl group in the molecule, which contains 30-92% by mol of ethylene units (i), 6-70% by mol of .alpha.-olefin units (ii) and 0.1-30% by mol of triene or tetraene units (iii), and which has a molar ratio of ethylene units (i) to .alpha.-olefin units (ii) of 40/60 to 92/8 (ethylene units (i)/.alpha.-olefin units (ii)) and an intrinsic viscosity (.eta.), measured in Decalin at 135.degree. C., of 0.05 to 10 dl/g. This novel unsaturated copolymer of ethylene is excellent in weathering resistance, heat resistance and ozone resistance and has a high vulcanizing rate.

Unsaturated copolymer of ethylene and process for preparing the same

A branched polyene compound represented by the formula ##STR1## wherein f is an integer of 1-5; R.sup.1 and R.sup.2 represent hydrogen atoms or alkyl groups of 1-5 carbons; R.sup.3 represents a hydrogen atom or an alkyl group of 1-5 carbons or an alkenyl group represented by the formula ##STR2## wherein n is an integer of 1-5; R.sup.4, R.sup.5 and R.sup.6 represent hydrogen atoms or alkyl groups of 1-5 carbons; all of R.sup.1, R.sup.2, R.sup.3 are not simultaneously hydrogen atoms; and all of R.sup.4, R.sup.5 and R.sup.6 are not simultaneously hydrogen atoms.

Branched polyene compounds and production thereof

2-piperazinopyrimidine derivatives

Growing community of inventors

Kuga-gun, Japan

Tatsuyoshi Ishida