Sumitomo Rubber Industries Limited

National Institute of Advanced Industrial Science and Technology

Kazuo Hochi

Kiyoto Maruoka

Akihiro Nakahara

Naohiko Kikuchi

Kazuhisa Fushihara

Takuya Horiguchi

Keiji Moriyama

Yasuhisa Minagawa

Masaya Tsunoda

Tetsuo Sakai

Kenichi Uesaka

Yuka Yokoyama

Takao Wada

Katsumi Terakawa

Ryuichi Tokimune

Yoichi Mizuno

Ai Matsuura

Tatsuya Kubo

Toshikatsu Kojima

Toshikazu Kondo

Masanobu Nakamura

Yutaka Yoshida

Masato Kawase

Akira Minagoshi

Seiji Hatano

Ritsuo Nakayasu

Kenichiro Ogata

Hiroyuki Tsujinaka

Kinuko Tsujinaka, Legal Representative

Minoru Tsujinaka, Legal Representative

Hiroyuki Tsujinaka, Deceased

Kouhei Tanaka

An object of the present invention is to provide a positive-electrode active material comprising a carbon-sulfur structure which has Raman shift peaks at around 500 cm, at around 1,250 cmand at around 1,450 cmin a Raman spectrum, and by using the positive-electrode active material, it is possible to greatly improve cycling characteristics of a lithium-ion secondary battery.

Sulfur-based positive-electrode active material and lithium-ion secondary battery

The present invention aims to provide a dynamically-crosslinked thermoplastic elastomer composition that can provide a molded product exhibiting low compression set especially in the case of being cooled under stress. The present invention relates to a thermoplastic elastomer composition, including a dynamically-crosslinked butyl rubber and a thermoplastic resin; and having a thermoplastic resin content of not more than 8% by mass. The dynamically-crosslinked butyl rubber is preferably a halogen-containing butyl rubber.

Thermoplastic elastomer composition and medical rubber product

The present invention provides a polar group-containing copolymer which can provide a rubber composition and a winter tire achieving the abrasion resistance, performance on ice, and handling stability on dry roads in a balanced manner. The present invention relates to a polar group-containing copolymer obtainable by copolymerizing a conjugated diene compound and a polar group-containing vinyl compound, wherein the polar group-containing vinyl compound is a compound that has a polymerizable unsaturated bond and a polar group, wherein any one of carbon atoms forming the polymerizable unsaturated bond and a carbon atom linked to the polar group are connected to each other via at least one carbon atom, and wherein a cis content of the double bond portion of the conjugated diene compound in the polar group-containing copolymer is 80 mol % or more.

Polar group-containing copolymer, rubber composition and studless tire

The present invention can provide a rubber composition, in which all of strength at break, low heat-build up property, run-flat durability and low fuel consumption can be improved since the rubber composition comprises 5 to 120 parts by weight of flake-like graphite having an average aspect ratio of 3 to 80 and an average particle diameter of 2 to 80 &#x3bc;m on the basis of 100 parts by weight of a diene rubber component, and a run-flat tire using the rubber composition.

Rubber composition and run-flat tire using same

The present invention provides a run-flat tire that can improve both of ride quality and run-flat performance. The run-flat tire of the present invention comprises a sidewall-reinforcing layer prepared by using a rubber composition comprising non-metallic short fibers having an average fiber diameter of 1 to 100 &#x3bc;m and an average fiber length of 0.1 to 20 mm in an amount of 5 to 120 parts by weight on the basis of 100 parts by weight of a diene rubber, the non-metallic short fibers being oriented in the circumferential direction of the tire.

Run-flat tire

The present invention provides a rubber composition capable of reducing rolling resistance, and improving abrasion resistance, wet skid performance, and steering stability. A tire having a tread and/or a sidewall using the rubber composition is also provided. The rubber composition of the present invention comprises not less than 10 parts by weight of the silica (1) having an average primary particle diameter of not less than 22 nm and not less than 5 parts by weight of the silica (2) having an average primary particle diameter smaller than 22 nm based on 100 parts by weight of a rubber component, wherein the total amount of the silica (1) and the silica (2) is 15 to 150 parts by weight. The tire of the present invention is prepared by using the rubber composition.

Rubber composition and tire having tread and/or sidewall using same

The present invention provides: a rubber composition for a tire having favorable productivity, excellent heat aging resistance and abrasion resistance, and excellent fuel economy; and a pneumatic tire using the rubber composition. The rubber composition contains neither soluble sulfur nor insoluble sulfur, and contains diene rubber, 1-15 parts by mass of compound 1 represented by formula (1) and 0.1-5 parts by mass of compound 2 represented by formula (2), per 100 parts by mass of the diene rubber, and the amount ratio of compound 1 to compound 2 (compound 1/compound 2) is 1-8. wherein R-Rare the same or different, and represent Calkyl, Caryl, or Caralkyl, and n represents an integer of 1-12; wherein R-Rare the same or different, and represent Calkyl, x and y are the same or different, and represent an integer of 2-4, and m represents an integer of 0-10.

Rubber composition for tire and pneumatic tire

A rubber composition for a tire having improved in low fuel efficiency, wet skid performance, abrasion resistance, and steering stability with favorable balance, and tire which has tread, using the same. A rubber composition for a tire, comprising 30 to 150 parts by weight of silica having a nitrogen adsorbing-specific surface area of 20 to 200 m/g, and a pH of 7.0 to 12.0 when the silica is dispersed in water to be 5% aqueous solution, based on 100 parts by weight of a rubber component, and a tire which has a tread, using the same.

Rubber composition for a tire and tire having a tread using the same

An earth-friendly tire using raw materials derived from non-petroleum resources instead of all or part of raw materials derived from petroleum resources currently used for tires. The tire is prepared by using a natural rubber instead of a synthetic rubber; an inorganic filler and/or a biofiller instead of carbon black; vegetable oil instead of petroleum oil; and natural fiber instead of synthetic fiber so that the tire has a non-petroleum raw material in an amount of at least 75 % by weight based on the total weight of the tire.

Eco tire

The present invention can provide a rubber composition for a bead apex comprising 20 to 120 parts by weight of a silica and 5 to 80 parts by weight of a graphite on the basis of 100 parts by weight of a rubber component comprising a natural rubber in an amount of not less than 30% by weight, use of which makes it possible to consider an effect on environment, prepare for decrease in petroleum supply in future, and reduce rolling resistance and improve steering stability, and a tire prepared by using it.

Rubber composition for bead apex and tire using same

There is provided a rubber composition for a sidewall, use of which makes it possible to consider an effect on environment, prepare for decrease in petroleum supply in future and further improve tear strength, flex crack growth resistance and weather resistance. The rubber composition comprises 15 to 120 parts by weight of a white filler and 5 to 50 parts by weight of graphite having an average particle diameter of 3 to 50 &#x3bc;m on the basis of 100 parts by weight of a rubber component comprising a natural rubber in an amount of not less than 30% by weight.

Rubber composition for sidewall and tire having a sidewall using same

The present invention provides a rubber composition for a bead, which has excellent processability and is capable of decreasing heat generation while maintaining rubber hardness, and a pneumatic tire having improved balance in fuel efficiency and steering stability. Specifically, the present invention provides a rubber composition for a tire bead comprising (B) 10 to 100 parts by weight of carbon black having nitrogen-adsorbing specific surface area of 30 to 100 m/g and dibutyl phthalate adsorption of 40 to 200 ml/100 g, and (C) 5 to 120 parts by weight of a think plate-like natural mineral having aspect ratio of 3 to 30 and average particle size of 2 to 30 &#x3bc;m, based on (A) 100 parts by weight of a rubber component.

Rubber composition for bead and pneumatic tire

The present invention provides a rubber composition for a tread which can improve both of grip performance and rolling resistance in good balance and a tire having a tread prepared by using it. The rubber composition for a tread of the present invention contains 30 to 80 parts by weight of a silica having a pH of 7.1 to 12.0 when dispersed in water to prepare a 5% aqueous dispersion; and not more than 10 parts by weight of a carbon black on the basis of 100 parts by weight of a rubber component comprising an epoxidized natural rubber and the tire of the present invention has a tread prepared by using the rubber composition.

Rubber composition for tread and tire having tread using same

The present invention provides a rubber composition for a base tread, which improves balance in low heat generating properties and steering stability, and a pneumatic tire using the same. Specifically, the present invention provides a rubber composition for a base tread of a tire comprising 5 to 120 parts by weight of a laminated natural mineral having aspect ratio of 3 to 30 and average particle size of 2 to 30 &#x3bc;m, based on 100 parts by weight of a diene rubber component, and a pneumatic tire having a base tread comprising the rubber composition.

Rubber composition for base tread and pneumatic tire

The present invention provides a rubber composition having more improved low heat build-up property and abrasion resistance, especially a rubber composition useful for the rubber composition used for a tread of tire, and the present invention also provides a tire having a tread prepared using the rubber composition. The rubber composition is one comprising 15 to 150 parts by weight of silica on the basis of 100 parts by weight of a rubber component, wherein the rubber component comprises not less than 10% by weight of a butadiene rubber which has a vinyl content of not more than 35% by weight and is modified with an un-substituted aminosilane compound.

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Kobe, Japan

Kazuo Hochi