Japan Synthetic Rubber Co., Ltd.

Shell Internationale Research Maatschappij, B.v.

Hyperion Catalysis International, Inc.

Takumi Miyachi

Hisao Ono

Masanobu Nagano

Yasuo Toyama

Kohei Goto

Hozumi Sato

Yasuhiko Takemura

Toshinori Sakagami

Hisaharu Ito

Humito Shimada

Tadaaki Nishi

Akio Sakaguchi

Ryuji Sato

Yasuo Ieki

Motokazu Takeuchi

A crosslinked thermoplastic elastomer composition obtained by mixing 100 weight parts of at least one type of thermoplastic elastomer, 0-200 weight parts of a rubber-like polymer, and 1-50 weight parts of ultra fine carbon fibrils whose diameter is 3.5-70 nm and whose aspect ratio is greater than 5 against 100 weight parts of the combined mixture of the aforementioned elastomer and rubber like polymer.

Thermoplastic elastomer compounds

A thermoplastic polymer composition consisting essentially of:

Thermoplastic polymer composition

Block copolymer composition

Thermoplastic elastomer compositions and process for the preparation

A thermoplastic elastomer composition which comprises 25-95% by weight of a polyamide and 75-5% by weight of a halogenated butyl rubber, a chlorosulfonated polyethylene or both thereof. Said composition is excellent in resistance to Freon gas permeation and has good oil resistance and low-temperature resistance. A hose wherein the layer to be contacted with a gas is made of the above thermoplastic elastomer composition is suitable as a Freon gas R-22 hose.

Thermoplastic elastomer composition and Freon gas hose made thereof

A catalyst consisting essentially of (A) a cobalt compound and (B) an organic phosphorus compound represented by the formula: ##STR1## wherein R.sup.1 and R.sup.2 are independently hydrogen atoms, alkyl groups or aryl groups, and three X's, which may be the same or different, are electron-donating groups. This catalyst is effectively used in a process for producing a conjugated diene polymer by polymerizing a conjugated diene in a hydrocarbon or halogenated hydrocarbon solvent in the presence of the above catalyst together with (C) an organoaluminum compound and (D) 0.25-1.5 mols, per mol of the organoaluminum compound (C), of water.

Catalyst for polymerization of conjugated diene and process for

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Tokyo, Japan

Takumi Miyachi