Bridgestone Corporation

Bridgestone Tire Company Limited

Toru Oniki

Kazuaki Yuto

Eiji Takiguchi

Nobumasa Ikeda

Itsuo Miyake

Disclosed herein is a low fuel consumption pneumatic tire with all weather running performances, which tire uses as a tread a vulcanizable rubber composition obtained by adding 30-80% by weight of carbon black having an iodine adsorption value of not less than 70 mg/g and a dibutylphthalate (DBP) adsorption of not less than 90 ml/100 g, and a low temperature plasticizing ester and/or naphthenic or paraffinic solftener in an amount 2 to 50% by weight relative to said carbon black into 100 parts by weight of a rubber component composed of 100 to 25 parts by weight of at least one kind of a first diene rubber containing 0 to 30% of styrene and 25 to 95% of vinyl bonds in the butadiene unit and 0 to 75 parts by weight of at least one kind of a second diene rubber which is different in kind from the above first diene rubber.

Low fuel consumption tire with all weather performances

A pneumatic tire having a low fuel consumption and all-weather running performances is disclosed, which comprises a tread composed of a rubber composition containing 30-80 parts by weight of carbon black having IA of not less than 70 mg/g and DBP absorption of not less than 90 ml/100 g, based on 100 parts by weight of a rubber blend consisting of 97-10 parts by weight of at least one diene rubber having a content of bound styrene of 0-30% and a content of vinyl bond in butadiene unit of 25-95%, 3-30 parts by weight of butyl rubber and/or halogenated butyl rubber, and 0-87 parts by weight of the other diene rubber.

Pneumatic tire having all-weather running performances

A pneumatic tire having remarkably low rolling resistance and high wet skid resistance without deteriorating the wear resistance is obtained by using in at least the ground-contact area of its tread, a rubber composition consisting essentially of 100 parts by weight of a mixed elastomer and 40-80 parts by weight of carbon black, the mixed elastomer consisting of 10-60 parts by weight of a solution-polymerized styrene-butadiene copolymer rubber having a bonded styrene content of 5-30% by weight and a trans-1,4 content in butadiene unit of not more than 45% by weight; 10-50 parts by weight of an emulsion-polymerized styrene-butadiene copolymer rubber having a bonded styrene content of 30-50% by weight; and 0-80 parts by weight of at least one rubber having a glass transition temperature of not higher than -50.degree. C., which is selected from the group consisting of natural rubber, synthetic polyisoprene rubber, polybutadiene rubber and an emulsion polymerized styrene-butadiene copolymer rubber having a bonded styrene content of 18-28% by weight. The use of carbon black having a specific surface area of 85-95 m.sup.2 /g, a dibutyl phthalate absorption value of 100-110 ml/100 g, a tinting strength of 95-105 and a half value width of at least 180 m.mu. in the size distribution curve of the aggregates is particularly effective for lowering the rolling resistance.

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Higashikurume, Japan

Toru Oniki