Sumitomo Rubber Industries Limited

Yuka Yokoyama

Toshiaki Sakaki

Takayuki Hattori

Ryoji Kojima

Takao Wada

Toshiro Matsuo

Shuichiro Ono

Keitaro Fujikura

Suguru Izumo

Seiji Hatano

Tatsuya Miyazaki

Wako Iwamura

Mutsuki Sugimoto

Kazuo Hochi

Takashi Miki

Makoto Sugiya

Kenichi Uesaka

Takahiro Mabuchi

Tetsuya Kunisawa

Soh Ishino

Ryota Kitago

Yoichi Mizuno

Ryo Mashita

Takuya Horiguchi

Takahiro Kawachi

Toshikazu Kondo

Daisuke Sato

Masako Nakatani

Masanobu Nakamura

Fumiya Kato

Akira Minagoshi

Hirotoshi Otsuki

Shogo Hirao

Tetsuya Maekawa

Keitarou Fujikura

Noboru Okabe

Ayuko Yamana

Yumi Suzuki

Haruko Sawaki

Mikako Yoshioka

Natsuki Sugimoto

Masafumi Yoshino

Kenichiro Ogata

Hisataka Kajita

Ayaka Kitao

Kouhei Tanaka

The present invention provides a rubber composition for treads, containing: a rubber component including an isoprene-based rubber and polybutadiene rubber; silica; carbon black; a terpene-based resin; and a water-soluble fine particle and/or a foaming agent, the terpene-based resin having a softening point of 70-150&#xb0; C., an &#x3b1;-pinene unit content of 65-100% by mass, and a &#x3b2;-pinene unit content of 0-35% by mass, the rubber component including, based on 100% by mass thereof, 20-80% by mass of the isoprene-based rubber and 20-80% by mass of the polybutadiene rubber, with a combined amount of the isoprene-based rubber and the polybutadiene rubber of 90% by mass or more, the rubber composition containing, per 100 parts by mass of the rubber component, 20-200 parts by mass of the silica, 0.1-50 parts by mass of the carbon black, and 0.1-50 parts by mass of the terpene-based resin.

Rubber composition for tires and pneumatic tire

Provided are a cap tread rubber composition for cold weather tires providing a balanced improvement in fuel economy, abrasion resistance, chipping resistance, performance on ice and snow during high-speed running, and high-speed performance (handling stability, grip performance) on snow/ice-free cold roads, and a cold weather tire formed therefrom. The rubber composition contains: a rubber component including an isoprene-based rubber, BR, and SBR; silica; and a plasticizer, the isoprene-based rubber and the BR being present in a combined amount of 80% by mass or more, the BR being present in an amount of 30% by mass or more, the SBR being present in an amount of 0.3-10% by mass, each based on 100% by mass of the rubber component, the rubber composition containing, per 100 parts by mass of the rubber component, 120 parts by mass or more of the silica and 50 parts by mass or more of the plasticizer.

Cap tread rubber composition for cold weather tires

Provided is a rubber composition for tires that provides a balanced improvement of wet grip, abrasion resistance, handling stability, and fuel economy during high-speed running, and further has less performance degradation after long-term service. Also provided is a tire including the rubber composition. Included is a rubber composition for tires containing, based on 100% by mass of a rubber component therein: 3-25% by mass of a component derived from an aromatic vinyl monomer; 0-15% by mass of a component derived from a butadiene monomer and having a vinyl configuration; 1-90% by mass of a component derived from a butadiene monomer and having a cis configuration; and 1-6% by mans of a component derived from an isoprene monomer and having a cis configuration, the rubber composition having, after vulcanization, physical properties satisfying the following relationships (1) and (2):&#x2212;25&#xb0; C.&#x3c;Tg&#x3c;0&#xb0; C.&#x2003;&#x2003;(1); and65&#x3c;Hs&#x3c;75&#x2003;&#x2003;(2).

Tire rubber composition and tire

The present invention provides a cap tread rubber composition and a pneumatic tire formed from the rubber composition which are excellent in grip performance and abrasion resistance during high speed running. Provided is a cap tread rubber composition, containing: styrene butadiene rubber and/or polybutadiene rubber; an isoprene-based rubber; a filler; and a plasticizer, the rubber composition containing, based on 100% by mass of a rubber component therein, at least 90% by mass in total of the styrene butadiene rubber and/or polybutadiene rubber and 0.3% to 10% by mass of the isoprene-based rubber, the filler including, based on 100% by mass thereof, at least 80% by mass of silica, the rubber composition containing, per 100 parts by mass of the rubber component, at least 110 parts by mass of the silica and at least 50 parts by mass of the plasticizer.

Cap tread rubber composition and pneumatic tire

To provide a rubber compound for tires, a pneumatic tire and an airless tire capable of improving the steering stability of the tire while exerting excellent low fuel consumption performance. A rubber compound for tires characterized in that, of vulcanized rubber's physical properties, a complex elastic modulus E*(unit: MPa) and a loss tangent tan &#x3b4;under initial strain of 10%, dynamic strain of 2% and temperature of 70 degrees C., satisfy 90&#x3c;E*&#x3c;250, and E*/tan &#x3b4;&#x3e;800. A pneumatic tire provided with a rubber member made of the above-mentioned rubber compound. An airless tire provided with a rubber member made of the above-mentioned rubber compound. An airless tire provided in a tread ring with a shear rubber layer made of the above-mentioned rubber compound.

Rubber compound for tires, pneumatic tire, and an airless tire

Provided are a cap tread rubber composition for cold weather tires enabling a balanced improvement in fuel economy, abrasion resistance, performance on ice/snow, and high-speed performance on snow-/ice-free cold roads, and a cold weather tire formed from the same. The rubber composition contains: a rubber component including BR, SBR, and NR and/or IR; and a filler, the composition having a combined amount of NR, IR, and BR of 80% by mass or more, an amount of BR of 30% by mass or more, and an amount of SBR of 0.3-10% by mass, each per 100% by mass of the rubber component, the filler including 60% by mass or more of silica per 100% by mass of the filler, the composition containing, per 100 parts by mass of the rubber component, 50 parts by mass or more of a fine particle silica having a NSA of 190 m/g or more.

Provided are a rubber composition for tires that achieves a balanced improvement in fuel economy, abrasion resistance, and performance on ice, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for tires containing predetermined amounts of natural rubber, polybutadiene rubber, silica, and a silane coupling agent represented by a specific formula.

Rubber composition for tire, and pneumatic tire

Provided are a rubber composition for tires that shows a balanced improvement in fuel economy, abrasion resistance, wet performance, and handling stability, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for tires containing a modified diene rubber containing a functional group reactive with silica, a fine particle silica having a nitrogen adsorption specific surface area of 180 m/g or more, and a silane coupling agent represented by a specific formula.

Rubber composition for tyres, and pneumatic tyre

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

A method for manufacturing a tire rubber composition includes kneading a rubber component, a silane coupling agent and a silica having a BET specific surface area of 210 m/g or more, adding a vulcanization accelerator to a first kneaded material including the rubber component, silane coupling agent and silica, kneading a first resulting mixture including the rubber component, silane coupling agent, silica and vulcanization accelerator such that a second kneaded material including the rubber component, silane coupling agent, silica and vulcanization accelerator is obtained, adding a vulcanization agent to the second kneaded material including the rubber component, silane coupling agent, silica and vulcanization accelerator, and kneading a second resulting mixture including the rubber component, silane coupling agent, silica, vulcanization accelerator and vulcanization agent. The first kneaded material has a pH of 6.5 or less, and the second kneaded material has a pH of 8.0 or more.

Tire rubber composition manufacturing method and tire rubber composition

The tire of the present invention is a tire having an inner liner composed of a rubber composition for an inner liner which is excellent in steering stability, fuel efficiency and a balance of physical properties while maintaining air permeation resistance and durability. The rubber composition for an inner liner comprises a rubber component and additives, wherein E* (MPa) and tan &#x3b4; measured at a temperature of 70&#xb0; C., an initial strain of 10% and a dynamic strain of 2% satisfy the following formulas (1) to (3), an air permeation coefficient is not more than 12.00&#xd7;10cm&#xb7;cm/(cm&#xb7;s&#xb7;Pa), and TB (MPa) and EB (%) as measured in accordance with JIS K6251 satisfy the following formulas (4) and (5).*/tan &#x3b4;&#x3e;17&#x2003;&#x2003;Formula (1):2.5&#x3c;*&#x3c;5&#x2003;&#x2003;Formula (2):tan &#x3b4;&#x3c;0.15&#x2003;&#x2003;Formula (3):&#x3e;450&#x2003;&#x2003;Formula (4):&#x3e;10,000&#x2003;&#x2003;Formula (5):

Tire

The present invention provides a cold weather tire achieving a balanced improvement in conductivity, fuel economy, performance on ice and snow, high speed performance (handling stability, grip performance) on snow- and ice-free cold roads, and road noise performance. Provided is a pneumatic tire including: a two-layer tread including a base tread and a cap tread, the base tread being formed of a rubber composition for base treads containing: predetermined amounts of a rubber component including natural rubber and/or polyisoprene rubber, and a filler including silica and carbon black, the cap tread being formed of a rubber composition for cap treads containing a predetermined amount of silica, the cap tread having cells and/or voids.

Pneumatic tire

The present invention provides a modified natural rubber having a good balance of improved fuel economy, heat-aging resistance, processability, and breaking resistance, and a method for producing such a rubber. The present invention also provides a tire rubber composition and a pneumatic tire which are prepared using the modified natural rubber. The present invention relates to a highly purified, modified natural rubber whose pH is adjusted to 2 to 7.

Modified natural rubber, process for producing same, rubber composition for tire, and pneumatic tire

Provided are a rubber composition for tires that shows a balanced improvement in properties such as fuel economy, processability, heat aging resistance, abrasion resistance, wet-grip performance, performance on snow and ice, and handling stability, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for tires, containing: a highly purified, modified natural rubber having a pH adjusted to 2-7; carbon black and/or a white filler; and a styrene-butadiene rubber having a styrene content of 30% by mass or more, and also relates to a pneumatic tire formed from the rubber composition.

Provided are rubber compositions for tires capable of providing tire components and pneumatic tires that have the same level of fuel efficiency and wet grip performance (particularly, wet grip performance) as those of tire components and pneumatic tires containing conventional synthetic rubber, while satisfying the requirements for a sound material-cycle society. The present invention relates to rubber compositions for tires containing a biomass-derived rubber polymerized from an aromatic vinyl compound and a diene, the biomass-derived rubber having a pMC (percent modern carbon) measured in accordance with ASTM D 6866-10 of 1% or higher.

Rubber composition for tires, tire member, and pneumatic tire

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Kobe, Japan

Yuka Yokoyama