Mitsui Chemicals, Inc.

Yusuke Mizobuchi

Koji Endo

Sadahiko Matsuura

Yuichi Yamamura

Mayumi Hiwara

Kotaro Ichino

Fumito Takeuchi

Yuji Ishii

Kiyohide Inomata

Keisuke Shishido

Tatsuya Sakai

Yuji Noguchi

Kenta Ide

Yoko Kosugi

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

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Ichihara, Japan

Yusuke Mizobuchi