Jsr Corporation

Tamotsu Nagaoka

Toshihiro Tadaki

Masahiro Shibata

Takuo Sone

Takaomi Matsumoto

Iwakazu Hattori

Hiroshi Akema

The method for producing a modified conjugated diene based (co)polymer, according to the present invention comprises a step of reacting a conjugated diene based (co)polymer with a metal halide compound to obtain a modified conjugated diene based (co)polymer, the conjugated diene based (co)polymer having a weight-average molecular weight of 150,000 to 2,000,000 and being obtained by bonding, to a polymer having at least a conjugated diene unit, an alkoxysilyl group and an optionally protected primary amino group. The method can satisfactorily produce a conjugated diene based (co)polymer which has a high Mooney viscosity, excellent shape stability and good processability.

Method for producing modified conjugated diene based (co)polymer, modified conjugated diene based (co)polymer, and rubber composition

A conjugated diolefin copolymer rubber is produced by copolymerization of a conjugated diolefin and an aromatic vinyl compound and has a primary amino group and an alkoxysilyl group bonded to the copolymer chain. The conjugated diolefin copolymer rubber contains the aromatic vinyl compound in an amount of 5 to 60 wt %. The aromatic vinyl compound is densely distributed in one terminal of the copolymer chain, and is scarcely distributed in the other terminal. The conjugated diolefin copolymer rubber has a temperature difference (&#x394;Tg) of 25&#xb0; C. or more. The conjugated diolefin copolymer rubber has low hysteresis loss properties as well as improved abrasion resistance, rupture characteristics, and road grip characteristics without impairing wet skid characteristics. A method for producing the conjugated diolefin copolymer rubber is also disclosed.

Conjugated diolefin copolymer rubber, method for producing the same, rubber composition and tire

Conjugated diolefin-based copolymer rubber and composition thereof

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Minato-ku, Japan

Tamotsu Nagaoka