Mitsubishi Chemical Corporation

Mitsubishi Petrochemical Company Limited

Japan Polychem Corporation

Japan Polypropylene Corporation

Mitsubishi Yuka Badische Company, Ltd.

Toshihiko Sugano

Takashi Fujita

Hideshi Uchino

Taku Kato

Naoshi Iwama

Tomohiko Takahama

Sugio Nishimura

Yasuo Maruyama

Toru Suzuki

Takao Tayano

Eiji Isobe

Masami Kashimoto

Hiroshi Nakano

Takayuki Aoshima

Yoshiyuki Ishihama

Satoshi Hayakawa

Hisashi Shoda

Yoshinori Suga

Mitsutoshi Aritomi

Masuzo Yokoyama

Eiji Taniyama

Masayuki Tomita

Stefan Sieber

Shigeyuki Matsunami

Hironari Sano

Mitsuyuki Matsuura

Kazuhiro Yamamoto

Kazuya Sakata

Toshihiro Gotoh

Kiyoshi Yukawa

Kiyotoshi Fujioka

Hajime Mizuno

Tetsuya Morioka

Masayuki Yamazaki

Kouji Nakayama

Takashi Niwa

Kazuo Nakamura

Kazuhisa Tachi

Motohiro Seki

Yuuji Fujita

Shuuichi Toriu

June Endo

Toru Wada

Kazuyo Kuwaba

Kou Obata

Kouichi Katou

Masaaki Ito

Masaaki Itou

Yuu Hayakawa

Masao Sakaizawa

Kaori Imaeda

Hirotugu Niwa

Tsuyoshi Ogasawara

Yu Hayakawa

Kazuya Okano

Yutaka Ohtani

Hirohisa Kitagawa

Takao Usami

Kimiho Kosegaki

Osamu Shibata

A catalyst having a high catalyst activity, which enables the production of an &#x3b1;-olefin polymer improved in stereoregularity by decreasing an amorphous component, and a production method for the &#x3b1;-olefin polymer, are developed. Described are a catalyst for polymerizing &#x3b1;-olefin comprising a combination of (A) a solid catalyst component containing magnesium, titanium and a halogen as an essential component, which may contain if necessary, a silicon compound, an organoaluminum compound, and an electron donor; (B) an organoaluminum compound; and (C) a compound containing a C(&#x2550;O)N bond such as an amide or an urea; which may further contain if necessary, (D) a silicon compound or a diether compound; and a production method for an &#x3b1;-olefin polymer using the same.

Polymerization catalyst for &#x3b1;-olefins and process for production of &#x3b1;-olefin polymers therewith

An ethylene polymer excellent in molding processability represented by uniform extensibility, drawdown resistance, swell and extrudability, and mechanical properties represented by rigidity, impact resistance and ESCR, is provided. Particularly, an ethylene polymer remarkably excelent in balance between rigidity and ESCR as compared with a conventionally known ethylene polymer is provided. An ethylene polymer, which is an ethylene homopolymer or a copolymer of ethylene with an &#x3b1;-olefin having a carbon number of from 3 to 20, and which satisfies the following conditions (1) to (4): (1) the melt index (HLMI) under a load of 21.6 kg at 190&#xb0; C. is from 0.1 to 1000 g/10 min, (2) the density (d) is from 0.935 to 0.985 g/cm, (3) the relation between HLMI and d satisfies the following formula (i): d&#x2267;0.00900&#xd7;log(HLMI)+0.951, (4) the relation between ESCR and the flexural modulus (M) satisfies the following formula (ii): M&#x2267;&#x2212;7310&#xd7;log(ESCR)+32300.

Ethylene polymers

The present invention provides a catalyst for olefin polymerization having high olefin polymerization activity without being accompanied by generation of an adhered polymer on the wall of a polymerization reactor and the wall of pipe line and generation of a locking massive polymer, and capable of manufacturing an olefin polymer industrially and stably for a long period of time. That is, the present invention related to a catalyst for olefin polymerization comprising [A1] a hafnium compound or a zirconium compound having at least one conjugated 5-membered ring ligand, [A2] a zirconium compound having at least one conjugated 5-membered ring ligand but different from [A1], and [B] phyllosilicate, and relates to a method of polymerizing or copolymerizing olefin in the presence of the catalyst.

Catalyst for olefin polymerization and method of polymerization of olefin

To provide a propylene based block copolymer that, when used as a molding material, exhibits an extremely good stiffness-impact resistance balance and has good heat resistance and excellent moldability, and therefore, in molding, good appearance is revealed. That is, the invention provides a propylene based block copolymer obtained through a preceding stage step of producing a propylene polymer component (PP) and a subsequent stage step of producing a propylene-ethylene copolymer component (EP) using a metallocene catalyst, wherein the block copolymer satisfies specific requisites.

Propylene block copolymer

Catalysts for polymerization of &agr;-olefins, process for producing &agr;-olefin polymers, novel transition metal compounds and catalyst components for polymerization of &agr;-olefin

Propylene block copolymer and propylene resin composition

Propylene polymer

Component of catalyst for olefin polymerization

Catalyst components for polymerization of olefins and use thereof

Transition metal compound, catalyst component for olefin polymerization and process for the preparation of &agr;-olefin polymer

Propylene block copolymer and resin composition

Process for producing &agr;-olefin polymers

An alkali metal- or alkali earth metal-containing organic compound (i) is reacted with a leaving group- and silicon- or germanium-containing compound (ii) in the presence of a nitrogen-containing aromatic heterocyclic compound. By such a method, it is possible to produce a silicon- or germanium-containing organic compound, for example, a cyclopentadienyl compound cross-linked by a silicon atom or a germanium atom, typically a cyclopentadienyl compound which is substituted with a substituted or unsubstituted silyl or germyl group, for a short time with a high yield.

Processes for producing silicon- or germanium-containing organic compound, transition metal complex, catalyst for polymerization of &agr;-olefin and &agr;-olefin polymer

Growing community of inventors

Yokkaichi, Japan

Toshihiko Sugano