Mitsui Chemicals, Inc.

Prime Polymer Co., Ltd.

Kenji Michiue

Masahiro Yamashita

Makoto Mitani

Yasushi Tohi

Ryoji Mori

Nobuo Kawahara

Hiromu Kaneyoshi

Koji Kawai

Terunori Fujita

Junji Saito

Yoshiho Sonobe

Tadahiro Sunaga

Naoto Matsukawa

Keita Itakura

Yasushi Nakayama

Hideki Bando

Yukio Ishii

Takeshi Karino

Yasuhiro Kai

Sei-ichi Ishii

Naoya Noda

Sei-Ichi Ishii

An object of the present invention is to provide a highly heat resistant and highly rigid propylene-based polymer having unprecedentedly high stereoregularity. The propylene-based polymer of the present invention satisfies requirements (1) to (4) and preferably requirement (5): (1) an average meso chain length is 800 to 100,000; (2) a MFR is 0.5 to 1,000 g/10 minutes; (3) a ratio of Mw to Mn, Mw/Mn, as measured by GPC is 4.2 to 20; (4) when the ratio of a component which elutes at a temperature of 122&#xb0; C. or more as measured by temperature rising elution fractionation (TREF) is A % by weight and the melt flow rate of the requirement (2) is B g/10 minutes, 100&#x2265;A&#x2265;20&#xd7;EXP(&#x2212;0.01&#xd7;B); (5) an amount of a component soluble in n-decane at 23&#xb0; C. is 0.01 to 2% by weight.

Propylene-based polymer, method for producing the same, propylene-based resin composition and molded article

An object of the invention is to provide copolymers which have a double bond in a side chain and are substantially free of unsaturated bonds in the main chain, copolymers which have a cyclic structure and are substantially free of unsaturated bonds in the main chain, and processes for economically synthesizing these copolymers.

Copolymer of olefin and conjugated diene, and process for producing the same

Ethylene-based copolymer microparticles and functional group-containing ethylene-based copolymer microparticles that have particle diameter smaller than that of conventional polyethylene fine-particles, no inter-particle agglomeration, very narrow particle size distribution, and high sphericity are provided, in which requirements (A) to (E): (A) The intrinsic viscosity [&#x3b7;] measured in decalin at 135&#xb0; C. is in the range of 0.1 to 50 dl/g, (B) at least 95 wt % or more of particles pass through a mesh screen with an opening of 37 &#x3bc;m, (C) the median diameter (d) measured by laser diffraction scattering is 3 &#x3bc;m&#x2266;d&#x2266;25 &#x3bc;m, (D) the circularity coefficient is 0.85 or more, and (E) the variation coefficient of particle diameter (Cv) is 20% or less. Non-agglomerated spherical magnesium-containing microparticles used as magnesium-containing carrier component for olefin-polymerization catalysts that can manufacture the above microparticles are also provided.

Ethylene-based polymer microparticles, functional group-containing ethylene-based polymer microparticles, and catalyst carriers for manufacture thereof

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 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

Metallocene compound, and process for preparing polyolefin by using it

Growing community of inventors

Chiba, Japan

Kenji Michiue