Mitsui Chemicals, Inc.

Mitsui Petrochemical Industries, Ltd.

Arakawa Chemical Industries, Ltd.

Tetsuji Kasai

Mamoru Takahashi

Shiro Otsuzuki

Toshiyuki Tsutsui

Terunori Fujita

Makoto Mitani

Junji Saito

Masahiko Okamoto

Naoto Matsukawa

Tetsuhiro Matsumoto

Kazutaka Tsuru

Yasushi Tohi

Takashi Nakagawa

Hideki Sakai

Satoshi Akiyama

Keiji Kawamoto

Shinichi Nagano

Takahiro Akashi

Koji Endo

Kotaro Ichino

Hiromi Shigemoto

Kyoko Kobayashi

Mikio Nakagawa

Masao Maeda

Kenji Iwamasa

Kazuyoshi Kaneko

Yukiharu Yamada

Yasuo Funabara

Yoshiyuki Hirase

Keiko Fukushi

Mayumi Yasuda

Kimio Ueda

Junji Tan

Kan Matsumoto

Hiroyuki Hori

To provide a propylene-based copolymer and a propylene-based copolymer composition, each of which has a high melt tension because it has a long-chain branched structure, exhibits excellent molding processability during molding, such as inflation molding, extrusion molding, blow molding, injection molding or vacuum forming, and is capable of favorably providing a foamed product having an excellent expansion ratio and excellent cell uniformity in the foaming stage. The propylene-based copolymer (A) of the present invention comprises 50 to 95% by mol of constituent units [i] derived from propylene, 4.9 to 49.9% by mol of constituent units [ii] derived from an &#x3b1;-olefin of 2 to 10 carbon atoms other than propylene and 0.1 to 10% by mol of constituent units [iii] derived from a non-conjugated polyene (with the proviso that the total amount of the constituent units [i], [ii] and [iii] is 100% by mol), and is characterized by satisfying specific requirements (a) and (c).

Propylene-based copolymer, propylene-based copolymer composition, molded product thereof and foamed product thereof, and production process therefor

The present invention provides an ethylene polymer that has excellent fluidity and moldability as well as gives a molded product having excellent mechanical strength. The ethylene polymer of the present invention contains 0.02 to 1.50 mol % of a constitutional unit derived from &#x3b1;-olefin having 6 to 10 carbon atoms, and has the density of 945 to 975 kg/m, which satisfies both of the following requirements [1] and [2] simultaneously:

Ethylene polymer and use thereof

An ethylene polymer containing 0.01 to 1.20 mol % of a constitutional unit derived from &#x3b1;-olefin having 6 to 10 carbon atoms, wherein with respect to cross fractionation chromatography (CFC), either (1) the weight average molecular weight (Mw) of the components eluted at 73 to 76&#xb0; C. does not exceed 4,000, or (2) the ethylene polymer satisfies the following relationship (Eq-1), provides a molded product having excellent moldability and therefore excellent mechanical strength and appearance:&#x2266;0.1&#x2003;&#x2003;(Eq-1)wherein Sis the sum of the total peak areas related to the components eluted at 70 to 85&#xb0; C., and Sis the sum of the total peak areas related to the components eluted at 0 to 145&#xb0; C.

Ethylene polymer and application thereof to moldings

An ethylene (co)polymer of the present invention is a (co)polymer with excellent moldability and mechanical properties and either an ethylene homopolymer or a copolymer of ethylene and an &#x3b1;-olefin of 4 to 20 carbon atoms. The (co)polymer has methyl branches measured byC-NMR less than 0.1 in number per 1,000 carbon atoms and Mw/Mn measured by GPC not lower than 1.8 and lower than 4.5. The (co)polymer is either an ethylene homopolymer or a copolymer of ethylene and an &#x3b1;-olefin of 3 to 20 carbon atoms. The melt tension (MT) and the swell ratio (SR) satisfy the relation; log(MT)&#x3e;12.9&#x2212;7.15&#xd7;SR; and the intrinsic viscosity ([&#x3b7;]) and the melt flow rate (MFR) satisfy the relation; [&#x3b7;]&#x3e;1.85&#xd7;MFRin the case of MFR&#x3c;1 and the relation; [&#x3b7;]&#x3e;1.85&#xd7;MFRin the case of MFR&#x2267;1. Such an ethylene (co)polymer can be usable for various molding applications and especially suitable for pipes.

Ethylene (co) polymer and its use

An ethylene (co)polymer of the present invention is a (co)polymer with excellent moldability and mechanical properties and either an ethylene homopolymer or a copolymer of ethylene and an &#x3b1;-olefin of 4 to 20 carbon atoms. The (co)polymer has methyl branches measured byC-NMR less than 0.1 in number per 1,000 carbon atoms and Mw/Mn measured by GPC not lower than 1.8 and lower than 4.5. The (co)polymer is either an ethylene homopolymer or a copolymer of ethylene and an &#x3b1;-olefin of 3 to 20 carbon atoms. The melt tension (MT) and the swell ratio (SR) satisfy the relation; log(MT)&#x3e;12.9&#x2212;7.15&#xd7;SR; and the intrinsic viscosity ([&#x3b7;]) and the melt flow rate (MFR) satisfy the relation; [&#x3b7;]&#x3e;1.85&#xd7;MFRin the case of MFR&#x2267;1 and the relation; [&#x3b7;]&#x3e;1.85&#xd7;MFRin the case of MFR&#x2267;1. Such an ethylene (co)polymer can be usable for various molding applications and especially suitable for pipes.

Ethylene (co)polymers and uses thereof

Process for manufacturing an extruded article and an extruded article

A crystalline thermoplastic resin composition comprises a rosin acid metallic salt and a crystalline thermoplastic resin. Optionally, a compatibilizing agent may also be included. The rosin acid metallic salt, which acts as a crystal nucleating agent, increases the crystallization rate of the crystalline thermoplastic resin and enables the formation of fine crystals of the resin. Thus, the crystalline thermoplastic resin composition can crystallize at a high rate, and provide molded articles having excellent mechanical properties and/or optical properties.

Process for crystal nucleation of crystalline thermoplastic resin

The cycloolefin resin compositions of the present invention comprise a thermoplastic resin containing an olefin polymer having an alicyclic structure, specific stabilizers selected from phenolic stabilizers, organic thioether stabilizers, organic phosphite stabilizers, UV-ray absorbers and hindered amine stabilizers. The cycloolefin resin compositions show excellent thermal aging resistance and weathering resistance by the use of specific stabilizers, and therefore they are favorably used for forming optical instrument parts. Furthermore, the thermoplastic resin may be prepared from an olefin polymer having an alicyclic structure and a flexible polymer or flexible polymers. The incorporation of the flexible polymer especially improves the mechanical strength of the resultant products, and therefore the resin compositions are favorably used for machine parts, electronic parts, automobile parts, etc.

Thermally stabilized thermoplastic cycloolefin in resin compositions

This invention concerns a polyolefin resin composition composed essentially of

Polyolefin resin composition

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Yamaguchi, Japan

Tetsuji Kasai