Mitsui Chemicals, Inc.

Koji Kawai

Yasushi Tohi

Hiromu Kaneyoshi

Nobuo Kawahara

Ryoji Mori

Munehito Funaya

Masahiro Yamashita

Naritoshi Hirota

Koji Endo

Mikio Hashimoto

Shigenobu Ikenaga

Ikunori Sakai

Takeshi Minoda

Keita Itakura

Yuichi Yamamura

Kenji Michiue

Naomi Urakawa

Masamichi Naito

Toru Takaoka

Toshiyuki Tsutsui

Norio Kashiwa

Keiji Okada

Hiroshi Hoya

Shinichi Kojoh

Masahiko Okamoto

Norihide Inoue

Hiromasa Marubayashi

Mayumi Hiwara

Chiemi Okawa, Legal Representative

A high molecular weight propylene polymer exhibiting high stereoregularity (isotactic) and high position selectivity can be effectively produced by polymerizing at least one monomer selected from propylene, &#x3b1;-olefins and polyenes in the presence of a catalyst for olefin polymerization comprising:

Process for producing propylene polymer

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

A transition metal compound represented by the following formula (2a): 

Propylene copolymer, polypropylene composition and uses thereof, transition metal compound and olefin polymerization catalyst

An automobile part comprising a polypropylene resin composition, the polypropylene resin composition comprising a propylene homopolymer (A1), an elastomer (B) and an inorganic filler (C) in specified proportions. The polypropylene homopolymer (A1) exhibits an MFR (230&#xb0; C.) of 20 to 300 g/10 min, a ratio of position irregular units derived from 2,1-insertion or 1,3-insertion of propylene monomer relative to all propylene structural units, determined from aC-NMR spectrum, each of 0.05% or less, and an Mw/Mn, determined by GPC, of 1 to 3.

Automobile part of polypropylene resin composition

A propylene/1-butene random copolymer containing 60 to 90 mol % of propylene units and 10 to 40 mol % of 1-butene units and has a triad isotacticity of not less than 85% and not more than 97.5%, a molecular weight distribution of from 1 to 3, an intrinsic viscosity of from 0.1 to 12 dl/g, a melting point of from 40 to 75&#xb0; C. and a crystallization rate at 45&#xb0; C. of 10 minutes or less, and satisfying the following relation, 146 exp (&#x2212;0.022M)&#x2267;Tm&#x2267;125 exp (&#x2212;0.032M), and an olefin catalyst for preparation thereof.

Propylene copolymer, polypropylene composition, and uses thereof, transition metal compounds and catalyst for olefin polymerization

The metallocene compound according to the invention and the olefin polymerization catalyst containing the compound are intended to produce a catalyst capable of preparing an isotactic polymer with a high polymerization activity. The metallocene compound contains a substituted cyclopentadienyl group and a (substituted) fluorenyl group and has a structure wherein these groups are bridged by a hydrocarbon group or the like. The process for preparing a metallocene compound according to the invention is intended to selectively prepare a specific metallocene compound so as not to produce an isomer, and in this process an intermediate product is synthesized by a specific method. The process for preparing a polyolefin according to the invention is intended to prepare a polyolefin having excellent impact resistance and transparency, and this process comprises homopolymerizing an &#x3b1;-olefin of 3 to 8 carbon-atoms or copolymerizing an olefin of 3 to 8 carbon atoms and another &#x3b1;-olefin in the presence of an olefin polymerization catalyst containing the above-mentioned metallocene compound.

Metallocene compound, process for preparing metallocene compound, olefin polymerization catalyst, process for preparing polyolefin, and polyolefin

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

The present invention provides a process for preparing a low molecular weight olefin (co)polymer having a narrow molecular weight distribution with high productivity, by polymerizing or copolymerizing an olefin in the presence of an olefin polymerization catalyst comprising (A) a specific Group 4 transition metal compound, and (B) at least one compound selected from the group consisting of (B-1) an organometallic compound, (B-2) an organoaluminum compound, (B-3) an organoaluminum oxy-compound, and (B-4) a compound which reacts with the Group 4 transition metal compound (A) to form an ion pair; and compounds useful in that process.

Process for preparing low molecular weight olefin (CO)polymer and polymerization catalyst used therefor

An automobile part comprising a polypropylene resin composition, the polypropylene resin composition comprising a propylene homopolymer (A1), an elastomer (B) and an inorganic filler (C), or comprising a propylene block copolymer (A2) and an inorganic filler (C) optionally together with an elastomer (B), in specified proportions. The propylene homopolymer (A1), or the propylene homopolymer segment of the propylene block copolymer (A2) exhibits an MFR (230-C) of 20 to 300 g/10 min, a ratio of position irregular units derived from 2,1-insertion or 1,3-insertion of propylene monomer relative to all propylene structural units, determined from aC-NMR spectrum, each of 0.2% or less, and an Mw/Mn, determined by GPC, of 1 to 3.

Automotive part made of polypropylene resin composition

The metallocene compound according to the invention and the olefin polymerization catalyst containing the compound are intended to produce a catalyst capable of preparing an isotactic polymer with a high polymerization activity. The metallocene compound contains a substituted cyclopentadienyl group and a (substituted) fluorenyl group and has a structure wherein these groups are bridged by a hydrocarbon group or the like. The process for preparing a metallocene compound according to the invention is intended to selectively prepare a specific metallocene compound so as not to produce an isomer, and in this process an intermediate product is synthesized by a specific method. The process for preparing a polyolefin according to the invention is intended to prepare a polyolefin having excellent impact resistance and transparency, and this process comprises homopolymerizing an &#x3b1;-olefin of 3 to 8 carbon atoms or copolymerizing an olefin of 3 to 8 carbon atoms and another &#x3b1;-olefin in the presence of an olefin polymerization catalyst containing the above-mentioned metallocene compound.

Metallocene compound, process for producing metallocene compound, olefin polymerization catalyst, process for producing polyolefin, and polyolefin

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Sodegaura, Japan

Koji Kawai