Ube Industries, Inc.

Bridgestone Corporation

Koichi Nagakura

Shinji Yamamoto

Eiji Yamanaka

Tatsuro Hamada

Seiichiro Iwafune

Masanori Aoyama

Koji Yamauchi

Yoshiyuki Morimoto

Koji Ishiguchi

Kohei Kaijiri

A rubber composition includes a rubber component and particulates of a crystalline syndiotactic-1,2-polybutadiene resin dispersed therein. The particulates have an average particle diameter of 1 to 500 .mu.m, and the melting point of the crystalline syndiotactic-1,2-polybutadiene resin is not less than 110.degree. C. The compounding ratio of the resin is 5 to 60 parts by weight relative to 100 parts by weight of the rubber component. The rubber composition is useful for tires, other rubber articles, etc. With respect to tires in particular, a pneumatic tire includes a rubber composition used for a tread, wherein the rubber composition includes a rubber component and particulates of crystalline syndiotactic-1,2-polybutadiene resin. The matrix portion of the tread rubber other than the above particulates is preferably a foamed rubber.

Rubber composition and all season type pneumatic tires made from a

A process for producing a reinforced rubber composition comprising the steps of:

Production of reinforced rubber composition

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Ichihara, Japan

Koichi Nagakura