Sumitomo Chemical Company, Limited

Sumtiomo Chemical Company, Limited

Akinobu Shiga

Toshio Sasaki

Masahiro Kakugo

Yoshiharu Fukui

Kiyoshi Matsuyama

Masahisa Okawa

Junpei Kojima

Kazuhiro Matsumura

Yukio Naito

Hiroshi Yoshioka

Kiyoshi Kawai

Hajime Sadatoshi

Kazuki Wakamatsu

Hideaki Matsuura

Masaaki Katao

Seiichiro Ima

Yasuharu Yamada

Takatoshi Suzuki

Mamoru Asada

Akira Nunose

Kizuku Wakatsuki

Katsumi Hanji

Masahisa Ohkawa

Koji Yamada

Katsuyoshi Yamashita

Tatsuya Miyatake

Hiroyuki Kora

Syozo Kawamata

Kooji Mizunuma

Satoru Uchida

Junpei Kozima

Takeshi Ebera

Hideaki Matsu-Ura

Masaharu Nishioka

Yoshio Kawai

Catalyst for olefin polymerization and process for producing olefin

Catalyst system for olefin polymerization and method for production of

Olefin polymers are produced by a process which comprises homopolymerizing or copolymerizing olefins in the presence of a catalyst system comprising:

Process for producing olefin polymers and catalyst used therein

A process for the production of .alpha.-olefin block copolymer particles having excellent impact resistance at low temperature and excellent molding and processing characteristics, is disclosed. The process includes a two step gas phase polymerization procedure under specific conditions in the presence of a specific catalyst system.

Alpha-olefin block copolymer particles and process for the production

A solid catalyst component containing a trivalent titanium compound, obtained by reducing a titanium compound represented by the general formula Ti(OR.sup.1).sub.n X.sub.4-n (wherein R.sup.1 is a hydrocarbon group of 1 to 20 carbon atoms, X is a halogen atom, and n is a number satisfying 0&lt;n.ltoreq.4) with an organomagnesium compound in the presence of an alcohol compound and/or a phenol compound to obtain a solid product and then treating the solid product with a mixture of an ether compound and titanium tetrachloride; a catalyst system comprising:

Process for producing olefin polymer

A process for producing an olefin polymer which comprises the homopolymerizing or copolymerizing an olefin in the presence of a catalyst system composed of an organoaluminum compound and a hydrocarbyloxy group-containing solid catalyst component which is prepared by

Catalyst system for polymerization of olefins

Process for producing .alpha.-olefin polymers

A process for producing a propylene copolymer having improved transparency and rigidity, which comprises carrying out (A) the polymerization of a vinyl cycloalkane having at least 6 carbon atoms and (B) the polymerization of propylene either alone or with ethylene in a multiplicity of steps in the presence of a catalyst system composed of a titanium compound and an organoaluminum compound. The content of the vinyl cycloalkane unit in the resulting copolymer is 0.05 to 10,000 weight ppm.

Process for producing propylene copolymer

Catalyst and process for producing alpha-olefin polymers using the same

A process for producing an .alpha.-olefin polymer which comprises polymerizing an .alpha.-olefin in the presence of a catalyst system comprising

Process for producing .alpha.-olefin polymers using novel catalyst system

A crystalline propylene polymer composition having excellent transparency and rigidity comprising a blend of a crystalline polypropylene with a polymer of a vinyl cycloalkane having at least 6 carbon atoms. The composition contains 0.05 weight ppm to 10,000 weight ppm of the vinyl cycloalkane unit.

Crystalline propylene polymer composition

A catalyst system for the polymerization of olefins which comprises;

Catalyst and process using same for producing olefin polymer

A method for the production of a solid titanium trichloride catalyst by the steps of preparing a titanium trichloride composition comprising a solid reduction product obtained by reducing titanium tetrachloride with an organoaluminum compound represented by the formula, R.sup.1.sub.n AlY.sub.3-n (wherein R.sup.1 is a hydrocarbon group having 1 to 18 carbon atoms; Y is a halogen atom or a hydrogen atom; and n is a number satisfying the equation, 1&lt;n.ltoreq.3), or a solid product obtained by thermally treating said solid reduction product at a temperature of not more than 150.degree. C.; reacting said titanium trichloride composition in an aromatic hydrocarbon solvent with a mixture consisting of a halogen compound represented by the formula, X.sub.2 (wherein X is Cl, Br, or I), or an interhalogen compound represented by the formula, XX'.sub.a (wherein X and X' are each Cl, Br, or I, and a is 1 or 3), and an ether compound represented by the formula, R.sup.2 --O--R.sup.3 (wherein R.sup.2 and R.sup.3, which may be the same or different, are each an alkyl group having 1 to 10 carbon atoms); subjecting the resulting reaction mixture to solid-liquid separation; and washing the resulting solid product with an inert hydrocarbon solvent, which method is characterized by using an aliphatic hydrocarbon as a washing medium during at least the first of washing treatments performed subsequently to said solid-liquid separation of said reaction mixture.

Method for the production of solid titanium trichloride catalyst

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Niihama, Japan

Akinobu Shiga