The Yokohama Rubber Co., Ltd.

Yasuhiro Mizumoto

Hiroyuki Kaido

Yukio Tozawa

Masashi Kida

Tsuneo Koyama

Masaru Hirai

Atsushi Kanazawa

Masatoshi Kozima

Kunihiro Kaneda

Akihiko Nakayama

Disclosed is a high hardness rubber composition having a hardness of at least 92, which comprises 100 parts by weight of a rubber, 55 to 95 parts by weight of soft black having an average particle size of 40 to 80 millimicrons, 5 to 30 parts by weight of a thermosetting resin and a small amount of a curing agent, the sum of the amounts of the soft black and thermosetting resin being 60 to 100 parts by weight per 100 parts by weight of the rubber. This high hardness rubber composition is advantageously used as a tire reinforcement for the rim cushion portion or for both the rim cushion portion and bead filler.

Rubber composition employing soft black and a thermosetting resin and

A rubber composition which comprises more than 0.5 wt parts of a cobalt salt of organic acid, more than 0.5 wt part of monohydroxybenzoic acid component and 100 wt parts of a rubber.

Rubber composition

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Hiratsuka, Japan

Yasuhiro Mizumoto