Sumitomo Rubber Industries Limited

Yoichi Mizuno

Masato Kawase

Mamoru Uchida

Toshiro Matsuo

Kazuo Kadomaru

Yoko Nakada

Takahiro Fukumoto

Naohiko Kikuchi

Kazuo Hochi

Takashi Miki

Kenichi Uesaka

Takao Wada

Yuka Yokoyama

Takuya Horiguchi

Isamu Tsumori

Takahiro Kawachi

Toshikazu Kondo

Masako Nakatani

Fumiya Kato

Shuichi Sakamoto

Noboru Wakabayashi

Tetsuya Maekawa

Marina Kotani

Yumi Suzuki

Ayuko Yamana

Noboru Okabe

Ritsuo Nakayasu

Natsuki Sugimoto

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 rubber composition for tires, which includes a rubber component containing a natural rubber component consisting of at least either a natural rubber or an epoxidized natural rubber, and an inorganic filler containing silica, and a pneumatic tire using such a rubber composition for tires are provided. The rubber composition can be used as a rubber composition for clinch apex, and in this case, the rubber component preferably consists of the natural rubber component, with the inorganic filler being contained in a range of 50 to 80 parts by mass and carbon black being contained in a range of 2 to 5 parts by mass relative to 100 parts by mass of the rubber component. The rubber composition for tires can be used as a rubber composition for a bead apex, and in this case, the inorganic filler contains silica and clay, and the compounding amount of the clay is set in a range of 5 to 40 parts by mass relative to 100 parts by mass of the rubber component, with the total compounding amount of the silica and clay being set to 65 parts by mass or more relative to 100 parts by mass of the rubber component.

Rubber composition for tires and pneumatic tire using the same

The present invention provides a rubber composition for a clinch, which highly improves steering stability and elongation properties in a balanced manner. Specifically, the present invention provides a rubber composition for a clinch comprising 20 to 70 parts by weight of carbon black containing silica and 0 to 50 parts by weight of carbon black, based on 100 parts by weight of a rubber component; wherein the total amount of the carbon black containing silica and the carbon black is 50 to 70 parts by weight.

Rubber composition for clinch and pneumatic tire using the same

The present invention provides a rubber composition for a breaker cushion suppressing exothermic heat and lower of rubber properties and a tire using the same. A rubber composition for a breaker cushion, comprising 25 to 35 parts by weight of carbon black having an iodine adsorption amount of 70 to 120 mg/g and 0.5 to 2.0 parts by weight of a resorcin condensate or a modified resorcin condensate based on 100 parts by weight of a rubber component, and a tire having a breaker cushion using the same.

Rubber composition for breaker cushion and tire using the same

To provide a rubber composition for breaker having balanced properties among rigidity, heat resistance, adhesiveness, humid aging adhesion and elongation, and a pneumatic tire having a breaker layer or a belt layer comprising the rubber composition. A rubber composition for breaker comprises 55 to 65 parts by weight of carbon black, 5 to 15 parts by weight of silica, 3.5 to 4.5 parts by weight of sulfur, at least 0.08 part by weight of cobalt, a resorcinol resin and a methylene donor based on 100 parts by weight of a rubber component containing a natural rubber and/or an isoprene rubber as a main component.

Rubber composition for breaker and pneumatic tire using the same

The present invention provides a rubber composition for base tread having reduced heat build-up characteristics and excellent reinforcing property, and a pneumatic tire using the rubber composition for the base tread. The rubber composition for base tread of the present invention comprises 30 to 40 parts by weight of carbon black having iodine adsorption amount of at least 115 mg/g, 5 to 10 parts by weight of silica and 1.2 to 2.2 parts by weight of sulfur based on 100 parts by weight of a rubber component, wherein the total amount of the carbon black and the silica is at most 45 parts by weight. The pneumatic tire of the present invention is obtained by using 20 to 80% by volume of a base tread based on the total volume of a tread comprising the rubber composition.

Bus or truck tire having cap/base tread

A rubber composition for tire and a pneumatic tire in which the rubber composition is used improve steering performance on snowy and icy roads as well as traction performance in the forward and backward directions while reducing the recycling and manufacturing cost. The rubber composition for tire contains from 0.5 to 12 parts by weight of paper relative to 100 parts by weight of a rubber component, and preferably further contains from 5 to 100 parts by weight of silica and from 2 to 15 parts by weight of short fiber relative to 100 parts by weight of the rubber component. The paper is newspaper waste. From 10 to 100 parts by weight of carbon black may further be contained relative to 100 parts by weight of the rubber component.

Rubber composition for tire and pneumatic tire

There is provided a rubber composition for breaker cushion excellent in elongation at break strength at break after aging with maintaining control stability, and a truck and bus tire using the rubber composition. A rubber composition for breaker cushion comprises 1,3-bis(citraconimidomethyl)benzene and 25 to 35 parts by weight of carbon black having a nitrogen adsorption specific surface area of 70 to 120 cm /g based on 100 parts by weight of a rubber component.

Rubber composition for breaker cushion

There is provided a rubber composition for tire tread, which can provide a tire having low decrease in abrasion resistance and balanced performance of traction property, braking property and cornering property. The rubber composition for tire tread is obtained by mixing 100 parts by weight of at least one rubber component selected from the group consisting of a natural rubber, an isoprene rubber and a butadiene rubber, 5 to 45 parts by weight of a silica, 0.5 to 4.0 parts by weight of a silane coupling agent and 3 to 8 parts by weight of a powdered article containing cellulose material.

Rubber composition for tire tread including silica and rice husk

The present invention provides a rubber composition for tire tread having compatibility between low fuel consumption and abrasion resistance, especially abrasion resistance under severe condition. The rubber composition for tire tread is obtained by adding carbon black containing silica as 10 to 55 parts by weight based on a rubber component of 100 parts by weight and silica coupling agent of 2 to 8% by weight based on the carbon black containing silica.

Rubber composition for tire tread

There is provided a rubber composition for tyre tread, which decreases rolling resistance without decreasing abrasion resistance. The rubber composition for tyre tread is obtained by mixing 100 parts by weight of a rubber component, 0.5 to 1 part by weight of N,N&prime;-bis(2-methyl-2-nitropyl)-1,6-hexane-diamine 1 to 1.5 parts by weight of sulfur and 1 to 3 parts by weight of a vulcanization accelerator, and wherein an amount X of sulfur and an amount Y of a vulcanization accelerator satisfy the equation: 2X&minus;1&lE;Y&lE;2X.

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

A tread rubber composition of excellent hydrophobic property and water repellency suitable to a studless tire of excellent performance on ice, comprising a diene rubber comprising at least one rubber selected from the group consisting of natural rubber, isoprene and polybutadiene as a main ingredient and, based on 100 parts by weight of the diene rubber, from 10 to 40 parts by weight of a clay comprising kaolinite as a main ingredient and having an oil absorption amount of from 50 to 70 g/100 g and 0.1 to 8 parts by weight of a silane coupling agent.

Tread rubber composition and tire using the composition

A rubber composition suitable for use in tread of tires, particularly studless tires having increased digging and adhesive frictions to improve characteristics on icy roads of the tires without substantial deterioration of the durability of the tires or with minimizing the deterioration, which comprises a diene rubber component, 3 to 30 parts by weight of an ebonite powder and 0.1 to 3 parts by weight of a silylating agent, respectively, per 100 parts by weight of the rubber component.

Rubber composition for treads of studless tires

A tread rubber composition is provided which includes 100 parts by weight of a diene rubber containing as a main component thereof at least one rubber selected from the group consisting of natural rubber, polyisoprene and polybutadiene, and 30 to 90 parts by weight of a vulcanized rubber powder, wherein the vulcanized rubber powder is a powder of a rubber resulting from the vulcanization of a rubber composition including 100 parts by weight of a diene rubber containing as a main component thereof at least one rubber selected from the group consisting of natural rubber, polyisoprene and polybutadiene, and 30 to 100 parts by weight of a clay mainly composed of kaolinite. The rubber composition for tire tread assures improved braking performance with the fracture resistance thereof kept satisfactory and, hence, a tire tread made of such rubber composition makes it possible to build a studless tire exhibiting an improved gripping force.

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Kobe, Japan

Yoichi Mizuno