Sumitomo Rubber Industries Limited

Ebara Environmental Plant Co., Ltd.

Takahiro Kawachi

Masako Nakatani

Takuya Horiguchi

Tatsuhiro Tanaka

Subaru Toya

Fumiya Kato

Ayuko Yamada

Kenichi Uesaka

Hiroshi Ito

Tetsuya Maekawa

Takashi Miki

Yuka Yokoyama

Takayuki Nagase

Kazuyuki Nishioka

Yoichi Mizuno

Shuichiro Ono

Keiji Takagi

Kenya Watanabe

Keiji Ikeda

Keiichi Nakadera

Junichi Ichikawa

Keisuke Sasada

Natsuki Maekawa

Noboru Okabe

Nanaho Kami

Yumi Suzuki

Satomi Yamauchi

Kei Matsuoka

Masataka Hiro

Ayuko Yamana

Kentaro Nakamura

Takayoshi Komatsu

Daiki Mukouguchi

Natsuki Sugimoto

Toshiyuki Umezawa

Akiko Yokoyama

Haruyuki Tomaru

Kazuki Ichiki

Junya Machida

Takashi Yanagihara

Taishi Abe

Shigetaka Motoi

It is an object to provide a tire having an excellent balance of wet grip performance and chipping resistance. The tire is a tire comprising a tread, wherein the tread has a lateral groove neither of both ends of which opens into circumferential grooves, wherein a predetermined rubber component, a predetermined filler, and a silane coupling agent are compounded in a rubber layer of a tread surface, wherein a brittleness temperature of the rubber component and a ratio of a groove depth at the deepest part of the groove bottom of the lateral groove neither of both ends of which opens into the circumferential grooves to a thickness of the entire tread are made to lie in predetermined ranges.

Tire

The present invention provides a tire having a good balance of fuel efficiency, chipping resistance, and steering stability.

A pneumatic tireincludes 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 the tread portion. The pneumatic tirehas a noise damperarranged on an inner cavity surface of the tread portion. Glass transition temperature of the noise damperis in a range of from −55 degrees Celsius to −45 degrees Celsius.

Pneumatic tire

An object of the present invention is to provide a rubber composition for a tread which is good in the balance between its wet grip performance and its chipping resistance. The rubber composition for a tread comprises 1 to 20 parts by mass of an ethylene-propylene-styrene copolymer and 60 parts by mass or more of a filler comprising a silica based on 100 parts by mass of a rubber component comprising 20 to 50% by mass of a butadiene rubber and 30 to 80% by mass of a styrene butadiene rubber, wherein an elongation at break of the rubber composition is not less than 300% in the atmosphere of 180&#xb0; C. according to JIS K 6251: 2017.

A pneumatic tyre () for decreasing running noise in a low temperature environment includes a noise damper () made of a porous material and fixed to a tyre inner cavity surface () of a tread portion (). In the noise damper (), hardness under a 25% compression load measured in accordance with Japanese Industrial standard JIS K6400-2 in an atmosphere of &#x2212;60 degrees Celsius is 110 kPa or less.

Pneumatic tyre

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%.

A rubber composition comprises 5 to 30 parts by mass of a terpene resin having a softening point of 100 to 120&#xb0; C. and a molecular weight of 500 to 10,000, and 2 to 10 parts by mass of a liquid rubber or a liquid resin having a molecular weight of 100 to 3,500, based on 100 parts by mass of a rubber component comprising 72 to 95% by mass of an aromatic olefin rubber and 5 to 28% by mass of a diene olefin rubber, wherein a ratio of a content of the terpene resin to a content of the liquid rubber or the liquid resin (a content of the terpene resin/a content of the liquid rubber or the liquid resin) is from 0.5 to 5, and the tire is one having a tire member composed of the rubber composition.

Rubber composition and tire

To be capable of preventing deterioration of uniformity after puncture repair while suppressing running noise. [Solution] A pneumatic tirecomprises a noise damperfixed to a tire inner cavity surface of a tread portionand formed of a porous material. The noise damperincludes a first partarranged on an outer side in a tire radial direction and fixed to the tire inner cavity surface, and a second partarranged on an inner side in the tire radial direction of the first partand exposed in a tire inner cavity. A water absorption rate of the first partcalculated by a following formula (1) is in a range of from 5% to 25%. Air permeability of the second partmeasured in accordance with Japanese Industrial Standard JIS-L1096 is in a range of from 1 to 7 cm3/cm2/s. The formula (1) is:water absorption rate (%)=weight change before and after immersion (g)/volume at 50% compression (cm3)&#xd7;100 &#x2003;&#x2003;(1).

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

Takahiro Kawachi