Sumitomo Rubber Industries Limited

Noboru Wakabayashi

Yasuhisa Minagawa

Takao Wada

Noriko Yagi

Yoichi Mizuno

Tomoaki Hirayama

Isamu Tsumori

Keiji Ikeda

Shuichi Sakamoto

Toru Iizuka

Masato Kawase

Marina Kotani

A rubber composition for a tire includes a rubber component containing at least one of a natural rubber and an epoxidized natural rubber, silica and a natural based wax, wherein the silica is contained in an amount of 10 parts by mass or more based on 100 parts by mass of the rubber component and the natural based wax is contained in an amount of 1.2% by mass or more and 2% by mass or less based on the total mass of the rubber composition for a tire, and to a tread, a side wall, a clinch and a tire using the rubber composition. A rubber composition for a base tread used to form a base tread of a tire, the rubber composition includes a rubber component composed of a diene based rubber, silica contained in an amount 20 parts by mass or more and 70 parts by mass or less based on 100 parts by mass of the rubber component consisting of a diene based rubber and a natural based wax contained in an amount of 2 parts by mass or more and 15 parts by mass or less based on 100 parts by mass of said rubber component composed of the diene based rubber, and to a base tread and a tire obtained by using the rubber composition for a base tread.

Rubber composition for tire, tire member, base tread rubber composition, base tread and tire

A rubber composition which is effective in improving the reaction efficiency of a silane coupling agent in kneading, suppressing generation of air bubbles, improving processability and abrasion resistance and lowering rolling resistance, and a process for preparing the same, wherein the rubber composition includes silica, 3 to 15 parts by weight of a silane coupling agent based on 100 parts by weight of the silica and 0.3 to 1.45 parts by weight of a potassium salt based on 100 parts by weight of silica.

Rubber composition and process for preparing the same

The present invention provides a racing tire tread rubber composition which is used for producing a racing tire having excellent wet grippability and does not cause any excessive adhesion in tire production process steps such as kneading and extruding steps. The racing tire tread rubber composition is a composition comprising: 100 parts by weight of a diene-based rubber; a filler, the entirety of which is in the range of 100 to 250 parts by weight containing 20 parts by weight or more of silica; and 5 to 50 parts by weight of a factice.

Racing tire tread rubber composition

A rubber composition which is superior in ozone resistance and is hard to be discolored brown and white which comprises 0.5 to 2.5 parts by weight of a wax containing a component with 45 or more carbon atoms and having an average number of carbon atoms of 28 to 38 and 3.0 to 7.0 parts by weight of antioxidant containing 30 to 100% by weight of N-(1-methylheptyl)-N&prime;-phenyl-p-phenylenediamine per 100 parts by weight of a diene rubber component.

Rubber composition for tire sidewall

The present invention relates to a method of setting a tire tread pattern provided with grooves at angles with respect to a vehicle's direction of travel that enables the vehicle to run straight on a sloping road with good maneuverability. The invention also relates to a method for selecting a vehicle of a given weight that is equipped with a tire having a set tread pattern for preventing skewing.

Growing community of inventors

Kobe, Japan

Noboru Wakabayashi