Asahi Kasei Kabushiki Kaisha

Asahi Kasei Kogyo Kabushiki Kaisha

Sigeru Sasaki

Hajime Nishihara

Ikuji Ohtani

Yoshikazu Suda

Koichi Miyamoto

Yuichi Kitagawa

A thermoplastic crosslinked rubber composition comprising (A) from 1 to 99 parts by weight of a hydrogenated rubber obtained by hydrogenating not less than 50% of total double bonds of at least one homopolymer rubber of a conjugated diene type monomer or a random copolymer rubber consisting of a conjugated diene type monomer unit and an aromatic vinyl monomer unit and (B) from 1 to 99 parts by weight of an olefinic thermoplastic resin, total amount of (A) and (B) being 100 parts by weight, said (A) being partially or completely crosslinked, wherein said (A) is crystalline rubber, having a crystallization temperature in a range of from &#x2212;50 to 70&#xb0; C. and a heat quantity of crystallization at peak in a range of from 3 to 100 J/g in differential scanning calorimetry (DSC method).

Thermoplastic crosslinked rubber composition

A thermoplastic crosslinked rubber composition comprising (A) from 1 to 99 parts by weight of a hydrogenated rubber obtained by hydrogenating not less than 50% of total double bonds of at least one homopolymer rubber of a conjugated diene type monomer or a random copolymer rubber consisting of a conjugated diene type monomer unit and an aromatic vinyl monomer unit and (B) from 1 to 99 parts by weight of an olefinic thermoplastic resin, total amount of (A) and (B) being 100 parts by weight, said (A) being partially or completely crosslinked, wherein said (A) is crystalline rubber, having a crystallization temperature in a range of from &minus;50 to 70&deg; C. and a heat quantity of crystallization at peak in a range of from 3 to 100 J/g in differential scanning calorimetry (DSC method).

A process for hydrogenating a conjugated diene polymer, which process comprises the steps of: deactivating a conjugated diene polymer which is prepared by using an organic alkali metal compound as a polymerization initiator by adding a deactivator; and contacting the deactivated diene polymer with hydrogen in an inert hydrocarbon solvent to hydrogenate the double bond of the deactivated diene polymer, wherein the hydrogenation is carried out (i) in the presence of a catalyst selected from organometallic compounds represented by the following formula: ##STR1## wherein the symbols are defined in the specification and (ii) under a condition satisfying the following relationship:

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Yokohama, Japan

Sigeru Sasaki