Mitsui Chemicals, Inc.

Tatsuya Sakai

Kotaro Ichino

Kiyohide Inomata

Yuji Ishii

Yuji Noguchi

Koji Endo

Fumito Takeuchi

Sadahiko Matsuura

Yuichi Yamamura

Keisuke Shishido

Mayumi Hiwara

Yusuke Mizobuchi

Kenta Ide

Yoshiharu Kikuchi

Kiminori Noda

Mitsunao Arino

Hayato Kurita

Hideki Mochizuki

Nozomi Kamiya

Mizuki Wakana

Takahiro Kondo

Ryohei Saeki

An object of the present invention is to provide a composition capable of allowing for production of a crosslinked foamed product suitable for applications of footwear parts such as soles and excellent in properties such as lightweight properties, heat shrinkability, compression set and mechanical strength in a well-balanced manner, a foamed product using the composition and a footwear part using the same. An ethylene copolymer composition including an ethylene copolymer (A) satisfying all the following requirements (A-a), (A-b), (A-c) and (A-d), ethylene/α-olefin having 3 to 20 carbon atoms/non-conjugated polyene copolymer rubber (B), and, if necessary, an ethylene/polar monomer copolymer (C); (A-a) a vinyl group content per 1,000 carbon atoms is 0.025 to 0.3, (A-b) MFR/MFRis 7 to 20, (A-c) a density is 0.850 to 0.910 g/cm, and (A-d) a melt flow rate is 0.01 to 200 g/10 min.

Ethylene copolymer composition and use thereof

The purpose of the present invention is to obtain an ethylene&#x22c5;&#x3b1;-olefin&#x22c5;non-conjugated polyene copolymer that has a low permanent compression set at low temperatures, is flexible, and has an excellent balance of rubber elasticity at low temperatures and tensile strength at normal temperatures. This ethylene-based polymer is an ethylene&#x22c5;&#x3b1;-olefin&#x22c5;non-conjugated polyene copolymer that includes units derived from ethylene (A), units derived from an &#x3b1;-olefin (B) containing 4-20 carbon atoms, and units derived from a non-conjugated polyene (C) and satisfies (1)-(4). (1) The molar ratio of (A) to (B) is 40/60-90/10, (2) the contained amount of the units derived from (C) is 0.1-6.0 mol %, (3) ML125&#xb0; C. is 5-100, and (4) the B value is 1.20 or more.

Ethylene &#x3b1;-olefin non-conjugated polyene copolymer, use thereof, and manufacturing method thereof

The present invention provides a crosslinked molded article having a lower compression set; and a method for producing a crosslinked molded article by injection molding, the method enabling shortening of one cycle in injection molding, the method being suitable for obtaining a crosslinked molded article having a lower compression set. The present invention relates to a method for producing a crosslinked molded article, comprising melt-kneading a polymer composition containing a polymer having a terminal double bond, a hydrosilyl group-containing compound (Y) having at least two hydrosilyl groups per molecule, a platinum-based catalyst (Z) for hydrosilicon crosslinking, and a reaction inhibitor (D), subjecting the polymer composition to injection molding in a mold, performing primary crosslinking in the mold, removing the primary-crosslinked molded article from the mold, and then performing secondary crosslinking in a heat medium.

Crosslinked molded article and production method thereof

Ethylene alpha-olefin non-conjugated polyene copolymer, use thereof, and manufacturing method thereof

The purpose of the present invention is to obtain an ethylene.&#x3b1;-olefin.non-conjugated polyene copolymer that has a low permanent compression set at low temperatures, is flexible, and has an excellent balance of rubber elasticity at low temperatures and tensile strength at normal temperatures. This ethylene-based polymer is an ethylene.&#x3b1;-olefin.non-conjugated polyene copolymer that includes units derived from ethylene (A), units derived from an &#x3b1;-olefin (B) containing 4-20 carbon atoms, and units derived from a non-conjugated polyene (C) and satisfies (1)-(4). (1) The molar ratio of (A) to (B) is 40/60-90/10, (2) the contained amount of the units derived from (C) is 0.1-6.0 mol %, (3) ML125&#xb0; C. is 5-100, and (4) the B value is 1.20 or more.

A railroad rail track pad composition including a particular ethylene&#xb7;&#x3b1;-olefin&#xb7;non-conjugated polyene random copolymer (A), clay (B), and a sulfur atom-containing silane coupling agent (C) is used in order to lower the viscosity of a rubber composition that is a raw material for molding while suppressing lowering of the rubber elasticity of a crosslinked and molded product to be obtained. In addition, a molded product obtained by crosslinking the composition, particularly a molded product obtained by crosslinking and foam-molding the composition, is provided with rubber elasticity that is suitable as a railroad rail track pad.

Railroad rail track pad composition and railroad rail track pad

Provided is a thermoplastic elastomer composition with which it is possible to obtain a molded article having exceptional low-temperature impact resistance. A thermoplastic elastomer composition is produced that contains a crystalline olefin polymer (A) and an ethylene-&#x3b1;-olefin (C)-unconjugated polyene copolymer (B) that satisfies requirements (1) and (2). (1) The B value represented by the equation: ([EX]+2[Y])/(2&#xd7;[E]&#xd7;([X]+[Y])) is 1.20 or higher. [E], [X] and [Y] respectively indicate the molar fraction of structural units derived from ethylene, the molar fraction of structural units derived from C&#x3b1;-olefin and the molar fraction of structural units derived from unconjugated polyene, and [EX] indicates the diad chain fraction of structural units derived from ethylene-structural units derived from C&#x3b1;-olefin. (2) The molar ratio of structural units derived from ethylene with respect to structural units derived from &#x3b1;-olefin (C) of copolymer (B) is 40/60-90/10.

Thermoplastic elastomer composition and method for producing same

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Ichihara, Japan

Tatsuya Sakai