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Sumitomo Rubber Industries Limited

Sumitomo Chemical Company, Limited

Takeshi Ota

Mamoru Uchida

Naohiko Kikuchi

Akira Minagoshi

Satoru Nippa

A rubber composition which can improve performance on icy and snowy road sufficiently and a tire using the same. The rubber composition comprises 2 to 30 parts by weight of staple fibers having an average fiber diameter of 10 to 100 &#x3bc;m and an average fiber length of 0.01 to 4 mm, and 1 to 10 parts by weight of particles having a Moh's hardness of at least 5 and an average particle size of at most 500 &#x3bc;m based on 100 parts by weight of a diene rubber. The tire of the present invention is prepared by using the rubber composition for tread. Examples of the particle are pumice, quarts, emery and the like.

Tire having tread including glass fibers and particles having Moh's hardness of at least 5

Disclosed herein is an aluminum hydroxide having specific characteristics, and a tire tread rubber composition and a pneumatic tire employing the aluminum hydroxide, which allow grip performance and abrasion resistance to increase and rolling resistance to decrease and are superior in processibility. The aluminum hydroxide has a loosed bulk density of not more than 0.60 g/cm , a DOP oil absorption of at least 70 cm /100 g and less than 250 cm /100 g, and a BET specific surface area of at least 30 m /g and less than 350 m /g. 5-150 parts by weight of the aluminum hydroxide is blended with 100 parts by weight of a rubber component to obtain the tire tread rubber composition. The rubber component preferably includes at least 60 parts by weight of styrene-butadiene rubber having a styrene content of 20-60% by weight.

Aluminum hydroxide, and tire tread rubber composition and pneumatic tire employing the aluminum hydroxide

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Kobe, Japan

Takeshi Ota