Mitsui Chemicals, Inc.

Yuichi Yamamura

Koji Endo

Mayumi Hiwara

Sadahiko Matsuura

Yusuke Mizobuchi

Kotaro Ichino

Yuji Ishii

Tatsuya Sakai

Kenta Ide

Yasushi Tohi

Tatsuya Nakamura

Shigenobu Ikenaga

Fumito Takeuchi

Keisuke Shishido

Kiyohide Inomata

Yuji Noguchi

Koji Kawai

Naritoshi Hirota

Takashi Yukita

Ryoji Mori

Masahiko Okamoto

Takashi Nakagawa

Munehito Funaya

Keita Itakura

Hiromu Kaneyoshi

Shiro Otsuzuki

Yoko Kosugi

Hiromasa Marubayashi

Takayuki Kajihara

Hiroshi Nishikawa

Naomi Urakawa

Tomohiro Yamaguchi

Satoshi Hashizume

Kouji Nagahashi

Shuji Matsumura

Masashi Higuchi

Ayako Kadosaka

Yoshio Sasaki

Miyuki Konno

Shiegenobu Ikenaga

Yasuo Ichiki

The purpose of the present invention is to obtain an ethylene&#x22c5;&#x3b1;-olefin&#x22c5;non-conjugated polyene copolymer that has a low permanent compression set at low temperatures, is flexible, and has an excellent balance of rubber elasticity at low temperatures and tensile strength at normal temperatures. This ethylene-based polymer is an ethylene&#x22c5;&#x3b1;-olefin&#x22c5;non-conjugated polyene copolymer that includes units derived from ethylene (A), units derived from an &#x3b1;-olefin (B) containing 4-20 carbon atoms, and units derived from a non-conjugated polyene (C) and satisfies (1)-(4). (1) The molar ratio of (A) to (B) is 40/60-90/10, (2) the contained amount of the units derived from (C) is 0.1-6.0 mol %, (3) ML125&#xb0; C. is 5-100, and (4) the B value is 1.20 or more.

Ethylene &#x3b1;-olefin non-conjugated polyene copolymer, use thereof, and manufacturing method thereof

Ethylene alpha-olefin non-conjugated polyene copolymer, use thereof, and manufacturing method thereof

The purpose of the present invention is to obtain an ethylene.&#x3b1;-olefin.non-conjugated polyene copolymer that has a low permanent compression set at low temperatures, is flexible, and has an excellent balance of rubber elasticity at low temperatures and tensile strength at normal temperatures. This ethylene-based polymer is an ethylene.&#x3b1;-olefin.non-conjugated polyene copolymer that includes units derived from ethylene (A), units derived from an &#x3b1;-olefin (B) containing 4-20 carbon atoms, and units derived from a non-conjugated polyene (C) and satisfies (1)-(4). (1) The molar ratio of (A) to (B) is 40/60-90/10, (2) the contained amount of the units derived from (C) is 0.1-6.0 mol %, (3) ML125&#xb0; C. is 5-100, and (4) the B value is 1.20 or more.

A process capable of producing an ethylene/&#x3b1;-olefin copolymer having a high molecular weight even under the conditions of a high polymerization temperature is provided. The process for producing an ethylene/&#x3b1;-olefin copolymer includes copolymerizing ethylene and an &#x3b1;-olefin having 3 or more carbon atoms in the presence of an olefin polymerization catalyst including a crosslinked metallocene compound (A) represented by the following general formula [I] and a cocatalyst component (B). In the general formula [I], Y is selected from a carbon atom, etc., M is a hafnium atom or the like, Rto Rare each selected from a hydrogen atom, a hydrocarbon group, etc., Rand Rare each a substituted aryl group or the like, at least one of Rand Ris a substituted aryl group having one or more electron-donating substituents having a Hammett substituent constant &#x3c3; of not more than &#x2212;0.2, Q is selected from a halogen atom, etc., and j is an integer of 1 to 4. 

Process for producing ethylene/&#x3b1;-olefin copolymer

A catalyst for olefin polymerization, comprising: wherein in Formula [1-1], R, R, R, R, R, R, R, and Rare each selected from a hydrogen, a hydrocarbon group and a silicon-containing group; the four groups of R, R, R, and Rare not hydrogen atoms, and are each selected from a hydrocarbon group or a silicon-containing group; Rand Rare each a hydrocarbon group or the like, excluding a hydrogen atom and a methyl group; M is Ti, Zr or the like; Y is carbon or the like; Q is a halogen or the like; and j is an integer from 1 to 4.

Catalyst for olefin polymerization, method for producing olefin polymer, method for producing propylene-based copolymer, propylene polymer, propylene-based polymer composition, and use of those

Provided is a transition metal compound represented by the general formula [III]:  

Fluorene derivative, transition metal compound, catalyst for olefin polymerization, and process for producing olefin polymer

The bridged metallocene compound or the olefin polymerization catalyst which comprises the compound, enables high polymerization activity in polymerizing one or more monomers selected from ethylene and &#x3b1;-olefins. The bridged metallocene compound contains specific substituted cyclopentadienyl and fluorenyl groups which are linked via carbon or silicon atoms. In the method for the preparation of polyolefins, one or more monomers, preferably ethylene as an essential monomer, selected from ethylene and &#x3b1;-olefins are copolymerized in the presence of the olefin polymerization catalyst comprising the bridged metallocene compound, so that an ethylene based polymer with an ethylene content of more than 50 mol % is obtained.

Crosslinked metallocene compound for olefin polymerization and method of polymerizing olefin with the same

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Ichihara, Japan

Yuichi Yamamura