Sumitomo Rubber Industries Limited

Takeo Nakazono

Mutsuki Sugimoto

Soh Ishino

Yuhei Yamashiro

Shuichi Sakamoto

Yumi Suzuki

The rubber composition for a tread comprises: 5 to 30 parts by mass of a carbon black, 95 parts by mass or more of silica, 25 parts by mass or more of a powder of an inorganic compound represented by a given formula (A) and having an average primary particle size of 10 &#x3bc;m or less, and 70 parts by mass or more of a softening agent comprising 2 to 15 parts by mass of a coumarone-based resin, based on 100 parts by mass of a rubber component comprising 70% by mass or more of a styrene-butadiene rubber having a styrene content of from 20 to 50% by mass and a vinyl content of from 15 to 65%, and the tire has a tread composed of the rubber composition for a tread.

Rubber composition for tread and tire

Provided is a pneumatic tire having well-improved fuel economy, rubber tensile strength, and abrasion resistance while maintaining adequate productivity. The present invention relates to a pneumatic tire formed from a rubber composition, the rubber composition containing a hydrogenated copolymer and a sulfur donor, the hydrogenated copolymer containing a structural unit derived from an aromatic vinyl compound and a structural unit derived from a conjugated diene compound and having a degree of hydrogenation of the conjugated diene portion of 75 mol % or more, the hydrogenated copolymer being present in an amount of 75% by mass or more based on 100% by mass of a rubber component in the rubber composition, the sulfur donor being present in an amount of 0.2 to 8 parts by mass per 100 parts by mass of the rubber component.

Pneumatic tire and method for producing pneumatic tire

A pneumatic tire including an inner liner made of a polymer sheet is provided, and the polymer sheet is made of a polymer composition. The polymer composition includes a polymer component of a styrene-isobutylene-styrene triblock copolymer by greater than or equal to 5 mass % and less than or equal to 80 mass %, and a rubber component of at least one kind selected from the group consisting of natural rubber, isoprene rubber, and isobutylene-isoprene rubber by greater than or equal to 20 mass % and less than or equal to 95 mass %. The polymer composition includes sulfur by greater than or equal to 0.1 mass parts and less than or equal to 5 mass parts with respect to the polymer component by 100 mass parts. The polymer sheet has a thickness Tof 0.6 mm&#x3c;T&#x2264;4.0 mm.

Pneumatic tire including inner liner

A pneumatic tire including an inner liner made of a polymer sheet is made of a polymer composition. The polymer composition includes a polymer component of a styrene-isobutylene-styrene triblock copolymer by 5 mass % to 40 mass %, and a rubber component of at least one kind selected from the group consisting of natural rubber, isoprene rubber, and isobutylene-isoprene rubber by 20 mass % to 95 mass %, and sulfur by 0.1 mass parts to 5 mass parts with respect to the polymer component by 100 mass parts. The polymer sheet has a thickness of 1.6 mm to 4.0 mm. A tread is made of a rubber composition including carbon black by 60 mass parts to 200 mass parts with respect to 100 mass parts of a rubber component including styrene-butadiene rubber by greater than or equal to 50 mass %.

The present invention provides a rubber composition for a tire tread which can prepare a tire having improved grip properties under conditions of a high temperature, and a pneumatic tire comprising the same. The present invention relates to the rubber composition for a tire tread containing more than 5 parts by weight of a basic antioxidant based on 100 parts by weight of the diene rubber components, wherein a metallic compound is a metallic compound comprising (1) a metallic salt of an organic carboxylic acid or (2) an inorganic metallic salt and an acid, and the pneumatic tire having a tire tread comprising the same.

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Kobe, Japan

Takeo Nakazono