Toa Nenryo Kogyo Kabushiki Kaisha

Japan Synthetic Rubber Co., Ltd.

Kazuo Soga

Yoshiharu Doi

Satoshi Ueki

Iwakazu Hattori

Makoto Miyazaki

Kohei Goto

Shigeo Suzuki

Yoshiyuki Michino

Takeshi Shiono

Shoji Ogasahara

Masahiro Shibata

A process for producing a polybutadiene, which comprises polymerizing 1,3-butadiene in an inert organic solvent with a catalyst comprising (A) a cobalt compound, (B) an organoaluminum compound consisting essentially of an aluminoxane and, if necessary, (C) a tertiary phosphine compound, (D) at least one compound selected from the group consisting of an ester compound, an alcohol compound, a phenolic compound, a sulfoxide compound, a nitrogen-containing heterocyclic compound, water and a tertiary amine compound and (E) at least one compound selected from the group consisting of carbon disulfide, a xanthogen compound and a thioisocyanide. By this process, there can be produced, as desired, a cis-1,4-polybutadiene, a 1,2-polybutadiene having a desired vinyl content, a crystalline 1,2-polybutadiene or a polybutadiene containing crystalline 1,2-polybutadiene segments.

Process for producing polybutadiene

1,4-Addition polymers or copolymers of diolefins useful as a functional or active polymer is provided which comprises, in combination, the following recurring units (A) and (B): ##STR1## wherein n=4 to 6 and A/B mole ratio=0 to 98/100 to 2.

Diolefin polymer of copolymer and a process for the production of the

A process for producing a propylene polymer having a carbonyl group at the terminal, said process comprising polymerizing propylene to give a living propylene polymer in the presence of a catalyst composed of beta-diketone vanadium chelate and an aluminum compound represented by the formula R.sub.2 AlX (wherein R is a hydrocarbon group having 1 to 8 carbon atoms and X is a halogen atom), and reacting the living propylene polymer with a carbonylating agent.

Process for producing propylene polymer

A catalyst for polymerization of olefins which comprises a vanadium compound of the formula: ##STR1## (where R.sup.1 is an alkyl group or aryl group having 1 to 8 carbon atoms; and R.sup.2 is an alkyl group or aryl group having from 1 to 8 carbon atoms, or hydrogen) and the organoaluminum compound of the formula R.sub.2 AlX (where R is a hydrocarbon group having 1 to 8 carbon atoms, and X is a halogen atom).

Catalyst for polymerization of olefins

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Tokyo, Japan

Kazuo Soga