Mitsui Chemicals, Inc.

Nobuo Kawahara

Norio Kashiwa

Tomoaki Matsugi

Hiromu Kaneyoshi

Koji Kawai

Shingo Matsuo

Hideyuki Kaneko

Yasushi Tohi

Shinichi Kojoh

Masahiro Yamashita

Keiji Okada

Ryoji Mori

Munehito Funaya

Naritoshi Hirota

Shin-Ichi Kojoh

Hiroshi Hoya

Mikio Hashimoto

Shigenobu Ikenaga

Ikunori Sakai

Norihide Inoue

Takeshi Minoda

Keita Itakura

Kenji Michiue

Masamichi Naito

Toru Takaoka

Junji Saito

Keiichi Ikeda

Hosei Shinoda

Tadahiro Sunaga

Yoshihiro Yamamoto

Sadahiko Matsuura

Toshiyuki Hirose

Kouichi Kizu

Takayuki Onogi

Tooru Tanaka

Fumio Kageyama

Takeshi Kashima

Masahiro Enna

Toshiro Takao

Yuichi Matsuda

Masumi Okita

Nobuhisa Mikawa

Kazuhisa Miyazaki

A hybrid polymer has a structure in which a polyolefin segment and a polar polymer segment are connected not via a bonding group containing a heteroatom. A method of the invention produces the hybrid polymer with industrial advantages. The hybrid polymer includes a polyolefin segment (A) and a polar polymer segment (B), the polar polymer segment being obtained by radical polymerization of a radically polymerizable monomer.

Hybrid polymer and method for production thereof

A modified polyolefin resin comprising a copolymer having a structure that a propylene-based polyolefin segment (a) and a segment (b) containing a lactic acid as a constituent are bonded in a block state and/or a graft state through a vinyl monomer having a hydroxyl group, wherein a number average molecular weight of the propylene-based polyolefin segment (a) is from 1,000 to 100,000, a number average molecular weight of the segment (b) containing lactic acid as a constituent is from 1,000 to 200,000, and a weight composition of the propylene-based polyolefin segment (a) and the segment (b) containing lactic acid as a constituent is from 10/90 to 90/10. The modified polyolefin resin can be used in a resin composition containing an aliphatic polyester resin (A), a polyolefin resin (B) and the modified polyolefin resin (C). The composition can exhibit excellent heat resistance and impact resistance and can be used for molding various parts.

Aliphatic polyester resin composition containing copolymer

A novel olefin-based polymer has excellent thermal resistance, as well as excellent balance among various properties. The olefin-based polymer is an olefin-based polymer comprising 50 to 100% by weight of a constituent unit derived from 4-methyl-1-pentene, and 0 to 50% by weight of a constituent unit derived from at least one olefin selected from olefins having 2 to 20 carbon atoms except 4-methyl-1-pentene, and having the following properties: i) the diad isotacticity is 70% or greater, ii) the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) as measured by gel permeation chromatography (GPC) is in the range of 1.0 to 3.5, and iii) the intrinsic viscosity [&#x3b7;] is 0.5 (dl/g) or greater.

Olefin-based polymers and uses thereof

A group of polymers comprising a plurality of polyolefin chains and polar polymer chains and having a multi-branched structure such as a block structure, a graft structure and a star-shaped structure is produced efficiently by polymerizing or reacting a combination of various polar monomers and their polymers i.e. polar polymer chains by using a functional group-containing polyolefin as a macroinitiator, a macromonomer or a reactive polymer. The resulting multi-branched polymer has a specific shape such as a block structure, a graft structure or a star-shaped structure, and has properties of both the polyolefin and polar polymer, thus exhibiting useful performance in various uses in films and compatibilizing agents as a novel polyolefin-based polymer.

Multi-branched polymer, process for producing the same, and applications thereof

A polypropylene composite film having a propylene/1-butene random copolymer which has 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.

Polypropylene composite film comprising a metallocene-catalyzed propylene/1-butene random copolymer

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

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

A novel graft polymer useful in various uses that has a polyolefin backbone having polyolefin segments excellent in moldability can be obtained by homopolymerizing a novel polyolefin macromonomer or polymerizing the novel polyolefin macromonomer in the coexistence of other olefins depending on need, wherein the macromonomer has at the terminal of its polyolefin chain a vinyl group whose &#x3b1;-position may be substituted, and the macromonomer can be efficiently obtained by a method, for example, successively carrying out i) a step of producing a polyolefin having a hydroxyl group at the terminal of the polyolefin chain and ii) a step of converting the terminal hydroxyl group of the polyolefin in chain into an acryloyl group, a methacryloyl group or a styryl group.

Polyolefin macromonomer, graft polymer obtained from the polyolefin macromonomer, and use thereof

A branched olefin copolymer demonstrating excellent performance in various uses, comprising a building block (A) represented by formula (1) below and a building block (B) represented by formula (2) below, obtained by e.g. a method which involves sequentially conducting (step 1) a step of synthesizing a polar group-containing olefin copolymer (Q) containing at least one functional group (G) selected from a hydroxyl group, a carboxylic acid group, an ester group, an amino group, an epoxy group, a silanol group and an acid anhydride group, (step 2) a step of converting the functional group (G) into a group having an ability to initiate radical polymerization, and (Step 3) a step of installing a polymer segment (Z) by radical polymerization of a monomer essentially comprising carbon-carbon double bond-containing compound (R) containing at least one selected from an oxygen atom, a nitrogen atom, a halogen atom and an aryl group;

Branched olefin copolymer, process for producing the same, and use 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 producing metallocene compound, olefin polymerization catalyst, process for producing polyolefin, and polyolefin

Hydrogenated ring-opening metathesis polymer and its use and production

Growing community of inventors

Sodegaura, Japan

Nobuo Kawahara