The Yokohama Rubber Co., Ltd.

Masashi Kida

Ken Takahashi

Youichi Yamaguchi

Yoshihiko Suzuki

Kazuyuki Kabe

Hiroyuki Kaido

Yasuhiro Ishikawa

Asahiro Ahagon

Shingo Midorikawa

Kazuhiro Yamada

Tsuneo Koyama

Atsushi Kanazawa

Yasuhiro Mizumoto

Ichiro Suzuki

Yuichi Saitoh

Saichi Harada

Kazuyuki Kaba

Kunihiro Kaneda

Akihiko Nakayama

Rubber compositions for tire treads of an all-weather type are disclosed which are so designed as to exhibit high dynamic Young's modulus, sufficient resistance to snow and ice skidding, to abrasion, to cracking and to crack growth and adequate durability. A selected base rubber is combined with a selected carbon black and a selected m-cresol resin. The base rubber is a blend of two different rubbers, one being natural rubber alone or a combination with a diene rubber and the other being butadiene rubber. The carbon black has specified absorptivity of iodine and dibutyl phthalate. The m-cresol resin is a novolak condensate.

Rubber composition for all-weather tires

A pneumatic radial tire having such a radial cross-section that the profile of the outer surface of the tire side is composed of a plurality of straight lines and each intersection at which the straight lines meet with each other is formed so as to protrude in the outward direction of the cross-section of the tire.

Pneumatic radial tire profile

Tread rubber compositions or use in automobile tires are disclosed which essentially comprise matrix rubbers and specified amounts of a selected class of low-hardness vulcanized rubbers having specified particle sizes. The matrix and vulcanized rubbers include carbon black, respectively, in amounts defined by the equation 0&lt;X.ltoreq.Y/3 where X is the amount of carbon black present in the vulcanized rubber, and Y is the amount of carbon black in the matrix rubber, each such amount being based on the total weight of the matrix rubber. The resulting tire is rendered highly resistant to snowy and icy conditions and also to abrasive wear.

Rubber compositions for automobile tire treads

A heavy load radial tire is disclosed, wherein a sub-carcass layer having a cord angle substantially equal to that of a carcass layer is disposed on the carcass layer, and at least one belt layer whose cords cross at right angles the cords of the sub-carcass layer is disposed on the sub-carcass layer.

Heavy load radial tire

A rubber composition comprising, in specific mixing ratios, rubber material consisting mainly of natural rubber and/or synthetic polyisoprene rubber, a cobalt salt of rosin, carbon black having specific iodine adsorbability and dibutyl phthalate absorbability, and sulphur.

Rubber compositions comprising (1) polyisoprene (2) cobalt salt of rosin

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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Chigasaki, Japan

Masashi Kida