Sumitomo Rubber Industries Limited

Fumiya Kato

Mutsuki Sugimoto

Takahiro Kawachi

Masako Nakatani

Kenichi Uesaka

Takuya Horiguchi

Takashi Miki

Yuka Yokoyama

Hiroshi Ito

Takayuki Nagase

Kazuyuki Nishioka

Yoichi Mizuno

Tatsuhiro Tanaka

Shuichiro Ono

Subaru Toya

Tetsuya Maekawa

Ayuko Yamada

Ayuko Yamana

Noboru Okabe

Masataka Hiro

Yumi Suzuki

Shigeki Otsubo

Natsuki Sugimoto

The present invention aims to provide tire rubber composition with significantly improved overall performance in terms of wet grip performance and fuel economy, and pneumatic tires including the rubber compositions. The tire rubber compositions of the present invention have a tan δ versus temperature curve whose peak tan δ and half width satisfy the following relationship (1):Peak tan δ/Half width≥0.025  (1).

Tire rubber composition and pneumatic tire

A pneumatic tirecomprises a carcassextending between bead cores of bead portions via a tread portionand sidewall portions, and a belt layerarranged on an outer side in a tire radial direction of the carcassand inside of the tread portion. The pneumatic tirefurther comprises a damping rubber bodyarranged between the carcassand the belt layer, and a noise damperarranged on an inner cavity surface of the tread portion. A width Win a tire axial direction of the damping rubber bodyis in a range of from 60% to 130% of a width Win the tire axial direction of the belt layer, and a water absorption rate of the noise damperis in a range of from 10% to 25%.

Pneumatic tire

Provided is a tire comprising a tread composed of a rubber composition, the rubber composition comprising 21 to 100 parts by mass of a liquid styrene butadiene rubber having a styrene content of 40 to 60% by mass and a weight average molecular weight of 4000 to 20000, based on 100 parts by mass of a rubber component comprising a linear styrene butadiene rubber having a styrene content of 35 to 45% by mass, a vinyl content of 35 to 45% by mass, and a weight average molecular weight of 1,000,000 to 1,400,000.

Tire

Provided is a tire comprising a tread composed of a rubber composition, the rubber composition comprising 5 to 100 parts by mass of an aromatic petroleum resin having a weight average molecular weight of 1000 to 5000, based on 100 parts by mass of a rubber component comprising a linear styrene butadiene rubber having a styrene content of 35 to 45% by mass, a vinyl content of 35 to 45% by mass, and a weight average molecular weight of 1,000,000 to 1,400,000.

According to a production method of a rubber composition for tire of the present invention comprising a rubber component (A) comprising at least one selected from the group consisting of a natural rubber and a synthetic diene rubber, a filler, a coupling agent (D) of (CHO)&#x2014;Si&#x2014;(CH)&#x2014;S&#x2014;CO&#x2014;CH, and a vulcanizing agent (E) comprising a vulcanizer and a vulcanization accelerator, the method comprising: a step X1 of kneading all amount of A, a part of the filler and a part of D, a step X2 of kneading the kneaded product of step X1, the remaining amount of the filler and D, and a step F of kneading the kneaded product of step X2 and E, it is possible to produce a rubber composition for tire in which fuel efficiency and abrasion resistance are improved in a good balance.

Production method of rubber composition for tire and tire

The present invention provides a pneumatic tire provided with a tread formed from a rubber composition that can achieve balanced improvements in fuel economy and wet-grip performance. The present invention relates to a pneumatic tire provided with a tread formed from a rubber composition, the rubber composition containing a rubber component, silica, and a specific silane coupling agent, the rubber component containing, based on 100% by mass of the rubber component, not less than 5% by mass of a conjugated diene polymer containing a constituent unit based on a conjugated diene and a specific constituent unit, at least one terminal of the polymer being modified with a specific compound, the rubber composition containing the silica in an amount of 5 to 150 parts by mass relative to 100 parts by mass of the rubber component.

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Kobe, Japan

Fumiya Kato