Mitsui Chemicals, Inc.

Otsuka Pharmaceutical Factory, Inc.

Mitsu Chemicals, Inc.

Ryoji Mori

Takashi Nakagawa

Yasushi Tohi

Shigenobu Ikenaga

Masahiko Okamoto

Hiromasa Marubayashi

Koji Kawai

Akira Todo

Nobuo Kawahara

Hiromu Kaneyoshi

Naritoshi Hirota

Kouji Nagahashi

Norio Kashiwa

Keiji Okada

Yuichi Ito

Shinichi Kojoh

Munehito Funaya

Masahiro Yamashita

Mayumi Hiwara

Kenji Michiue

Masakazu Jitsukata

Tatsuya Nakamura

Tadahito Nobori

Hiroshi Hoya

Tomoaki Matsugi

Satoru Moriya

Isamu Tateishi

Takashi Yukita

Norihide Inoue

Kenichi Morizono

Shiro Otsuzuki

Seiji Ota

Kouichi Kizu

Mamoru Kagami

Hideyuki Kaneko

Taku Koda

Kazuyuki Takimoto

Yuichi Yamamura

Takayuki Kajihara

Toru Takehara

Hayato Kurita

Junji Tan

Kazuyoshi Kaneko

Hitoshi Mori

Tomohiro Yamaguchi

Kouichi Igarashi

Masashi Higuchi

Sadamu Shirokuma

Hiroshi Takayasu

Miyuki Konno

Shiegenobu Ikenaga

Shunichi Hama

Yasuo Ichiki

Kazuki Mita

Rie Ishii

Akira Mitsui Chemicals Inc Todo

Akira c/o Mitsui Chemicals Inc Todo

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

The propylene-based polymer composition of the present invention includes This polymer composition is excellent in transparency, low-temperature impact resistance, and mechanical properties (flexibility or rigidity, etc.) and also excellent in heat resistance.

Propylene-based polymer composition, use thereof, and method for producing thermoplastic polymer composition

[Task] To provide a solar battery sealing material obtained by using an olefin-based (co)polymer, which is excellent in flexibility, stress-absorbing property, transparency, and impact-resistant strength at low temperature, and with which the productivity is improved by omitting a cross-linking treatment if necessary. [Solving Means] A solar battery sealing material containing 1 to 40 parts by weight of polypropylene (i) which has a propylene unit of more than 90 mol %; and 60 to 99 parts by weight of a propylene.ethylene-based copolymer (ii) which has a propylene unit of 45 to 90 mol %, an ethylene unit of 10 to 25 mol %, and an &#x3b1;-olefin unit (a) having 4 to 20 carbon atoms of 0 to 30 mol % ((i)+(ii)=100 parts by weight). The solar battery sealing material further contains 5 to 95 parts by weight of an ethylene.&#x3b1;-olefin copolymer (B), based on 95 to 5 parts by weight of the total amount of (i) and (ii) ((i)+(ii)+(B)=100 parts by weight).

Sealing material for solar battery, sheet for sealing solar battery, and solar battery module using the same

A material for vibration control of the invention includes a propylene polymer (A) containing a constitutional unit (a) derived from propylene in the proportion of 40 to 100 mol % and a constitutional unit (b) derived from &#x3b1;-olefin having 2 to 20 carbon atoms excluding propylene in the proportion of 60 to 0 mol % [provided that the total of (a) and (b) is 100 mol %], and having a melting point measured by DSC of 90&#xb0; C. or below or no observed melting point, and the material has excellent vibration controllability such as vibration damping property, vibration preventing property, sound insulating property, and sound absorbing property.

Material for vibration control, article for vibration control and multilayer laminate for vibration control

The present invention provides a propylene polymer composition having excellent transparency, flexibility, heat resistance, scratch resistance and rubber elasticity with a good balance. The propylene polymer composition comprises 1 to 40 parts by weight of isotactic polypropylene (i) and 60 to 99 parts by weight of a propylene/ethylene/&#x3b1;-olefin copolymer (ii) which contains 45 to 89% by mol of a propylene component, 10 to 25% by mol of an ethylene component, and optionally, 0 to 30% by mol of constituent units (a) derived from an &#x3b1;-olefin of 4 to 20 carbon atoms.

Propylene polymer compositions and uses thereof

A polyolefin composition comprising an olefin-based thermoplastic elastomer which is superior to conventional olefin-based thermoplastic elastomers in scratch resistance and abrasion resistance and has excellent heat aging resistance is proposed. [Means for Solving the Problem] A polyolefin composition comprising a syndiotactic &#x3b1;-olefin-based copolymer (A), a polyolefin resin (B) (other than polybutene (C)), polybutene (C), and if necessary, an ethylene-based copolymer rubber (D).

Polyolefin composition

Medical tubes are well balanced in transparency, flexibility, heat resistance, scratch resistance and rubber elasticity. The medical tubes including a propylene polymer composition (A) that contains a polymer with propylene units, at least part of the polymer having an isotactic structure and the total of the propylene units of the polymer being in an amount of 65 to 82 mol % (the total of the structural units of the polymer in the composition is 100 mol %), and that satisfies the following (a1), (a2) and (b1):

Medical tubes

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

A composition having excellent transparency, flexibility, rubber elasticity, thermal resistance, impact resistance, abrasion resistance and the like, a composition having excellent rigidity and impact resistance as well as excellently balanced in whitening resistance, abrasion resistance and heat sealability, and a composition having excellent rubbery properties, thermal resistance, abrasion resistance and flexibility are provided. A composition comprising a specific propylene&#x2022;&#x3b1;-olefin copolymer for which, in a signal chart measured byC-NMR and predetermined such that the peak present at the highest magnetic field among the signals originating from CH (methine) of the constituent unit derived from an &#x3b1;-olefin having 4 to 20 carbon atoms is to be at 34.4 ppm, an absorption intensity A at about 22.0 to 20.9 ppm and an absorption intensity B at about 19.0 to 20.6 ppm satisfy the following relational expressions (i) and (ii) with respect to an absorption intensity C at about 19.0 to 22.0 ppm, which is assignable to propylene methyl:()&#xd7;100&#x2266;8&#x2003;&#x2003;(i), and()&#xd7;100&#x2267;60&#x2003;&#x2003;(ii),

&#x3b1;-olefin-based polymer composition, molded product formed from the composition, and novel polymer

A propylene elastomer (PBER) comprising (a) 50 to 85 mol % of units derived from propylene, (b) 5 to 25 mol % of units derived from 1-butene and (c) 10 to 25 mol % of units derived from ethylene, and having a molar ratio of propylene content to ethylene content of from 89/11 to 70/30, and a modulus in tension (YM), as measured in accordance with JIS 6301, of not more than 40 Mpa.

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

The present invention proposes a molded product having excellent moldability and ability to be processed into parts, as well as excellent scratch resistance. The invention provides a multilayered laminate composed of two or more layers, having a structure in which a layer (I) comprising at least one selected from an olefinic thermoplastic elastomer composition (A) and an olefinic resin (B), and a layer (II) comprising an olefinic thermoplastic elastomer composition (C) are laminated. The olefinic thermoplastic elastomer composition (C) is a composition comprising [1] a specific syndiotactic polypropylene copolymer (c), and [2] at least one selected from a polypropylene resin (d) and an olefinic thermoplastic elastomer (e).

Olefinic thermoplastic elastomer laminate

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 invention provides a propylene polymer composition well balanced and excellent in transparency, flexibility, heat resistance, scratch resistance and rubber elasticity, and a medical tube made from the propylene polymer composition. The propylene polymer composition satisfies all the following properties (A), (B), (C) and (D): (A) the composition shows a loss tangent (tan &#x3b4;) peak at a temperature in the range of &#x2212;20 to 25&#xb0; C. according to dynamic viscoelasticity measurement (10 rad/s) in a torsion mode, and the peak is 0.5 or above; (B) the storage elastic modulus G' at 20&#xb0; C. from the dynamic viscoelasticity measurement is in the range of 1.0&#xd7;10to 4.9&#xd7;10dyn/cm; (C) the penetration temperature (&#xb0; C.) determined in accordance with JIS K 7196 is in the range of 60 to 160&#xb0; C.; and (D) the composition has a permanent set of not more than 30% as determined after the composition fixed between chucks 30 mm apart is 100% strained at a stress rate of 30 mm/min, maintained for 10 minutes and released for 10 minutes. The medical tube is made from the propylene polymer composition.

Propylene polymer composition and use thereof

A syndiotactic propylene-based polymer composition which retains the inherent features of the conventional non-crosslinked or partially crosslinked olefin-based thermoplastic elastomer, and also has excellent abrasion resistance and flexibility. The syndiotactic propylene-based polymer composition comprises 1 to 40 parts by weight of the syndiotactic polypropylene (B), and 5 to 60 parts by weight of the syndiotactic structured propylene-&#x3b1;-olefin copolymer (C) comprising 95 to 65 mol % of a syndiotactic structured propylene component and 5 to 35 mol % of an &#x3b1;-olefin (except propylene) component having 2 to 20 carbon atoms, based on 100 parts by weight of the non-crosslinked or partially crosslinked olefin-based thermoplastic elastomer (A).

Syndiotactic propylene polymer composition

Growing community of inventors

Ichihara, Japan

Ryoji Mori