Sumitomo Chemical Company, Limited

Junpei Kojima

Akinobu Shiga

Toshio Sasaki

Hiroshi Yoshioka

Masahiro Kakugo

Yukio Naito

Akira Nunose

Kazuki Wakamatsu

Kizuku Wakatsuki

Hajime Sadatoshi

Syozo Kawamata

Hiroyuki Kora

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 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 olefin polymer

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

A catalyst system for the polymerization of olefins comprising:

Olefin polymerization catalysts and process for producing olefin

A process for producing highly stereoregular .alpha.-olefin polymers which comprises polymerizing .alpha.-olefins in the presence of a catalyst system comprising:

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Ichihara, Japan

Junpei Kojima