Sumitomo Rubber Industries Limited

Sumitomo Chemical Company, Limited

Zs Elastomers Co., Ltd.

Toshiro Matsuo

Tetsuya Kunisawa

Takao Wada

Takayuki Hattori

Takashi Nakamura

Yuka Yokoyama

Yoichi Mizuno

Keitaro Fujikura

Shinichi Miyazaki

Naohiko Kikuchi

Kiyoshige Muraoka

Kenichi Uesaka

Hideyuki Okuyama

Takuya Horiguchi

Hideki Otsuji

Yosuke Miyazaki

Shuichi Sakamoto

Masato Kawase

Toru Iizuka

Keiichi Nakadera

Masako Imai

Jesus Rodriguez Castanon

Hayato Saba

The conjugated diene-based polymer of the invention comprises an aromatic vinyl unit based on an aromatic vinyl compound and a conjugated diene unit based on a conjugated diene compound, is modified with a compound containing a heteroatom, and has an SP value of 16.80 MPato 17.10 MPa.

Conjugated diene-based polymer, conjugated diene-based polymer composition, and method for producing conjugated diene-based polymer

The present invention provides a synthesis system that can synthesize aniline and/or styrene efficiently, a synthesis system that can synthesize butadiene (1,3-butadiene) efficiently, a rubber chemical for a tire which is synthesized from the aniline obtained by the synthesis system, a synthetic rubber for a tire which is synthesized from the styrene and/or butadiene obtained by the synthesis systems, and a pneumatic tire produced using the rubber chemical for a tire and/or the synthetic rubber for a tire. The present invention relates to a synthesis system for synthesizing aniline and/or styrene from an alcohol having two or more carbon atoms via an aromatic compound.

Synthesis system, rubber chemical substance for tires, synthetic rubber for tires, and pneumatic tire

A pneumatic tire capable of reducing rolling resistance and discharging static electricity generated during running, wherein each of a tread rubber, a breaker rubber, and a sidewall rubber formed on the tread part, the breaker part, and the sidewall part, respectively, has a volume specific resistivity of 1&#xd7;10&#x3a9;&#xb7;cm or more, the pneumatic tire further including a conduction rubber embedded in the tread part so as to be at least partially exposed to a surface of the tread part, bead part rubber disposed at a region contacting a rim flange of the bead part, and electroconductive rubber electrically connecting the conduction rubber to the beat part rubber, wherein each of the conduction rubber, the bead part rubber, and the electroconductive rubber has a volume specific resistivity of less than 10&#x3a9;&#xb7;cm.

Pneumatic tire

The present invention has its object to provide a rubber composition having excellent low-exothermic property and high strength together, and a pneumatic tire produced using the rubber composition. The present invention relates to a rubber composition which contains a rubber component and 10 to 150 parts by mass of silica per 100 parts by mass of the rubber component. The rubber component contains a butadiene rubber modified by a compound represented by the formula (1): wherein, R, Rand Rare the same or different and independently represent an alkyl group, an alkoxy group, a silyloxy group, an acetal group, a carboxyl group, a mercapto group, or a derivative thereof; Rand Rare the same or different and independently represent a hydrogen atom or an alkyl group; and n represents an integer.

Rubber composition and pneumatic tire

A rubber composition which provides an improved balance in grip performance, grip durability and abrasion resistance, and a tire and/or tire tred made from the same Wherein the rubber composition includes a diene rubber, 50 to 120 parts by weight of a reinforcing agent containing particular carbon black and 10 to 100 parts by weight of silica based on 100 parts by weight of a the diene rubber, 2 to 50 parts by weight of a styrene-butadiene polymer, in which weight average molecular weight is 1,000 to 15,000, the amount of a styrene being 17 to 27% by weight and the amount of vinyl being 60 to 80% by weight, and 2 to 25 parts by weight of an indene resin, in which the melting point is 100 to 150&#xb0; C., based on 100 parts by weight of the diene rubber which includes at least 60% by weight of a particular solution polymerization styrene-butadiene rubber and at most 40% by weight of a natural rubber and/or a butadiene rubber.

Rubber composition and tire comprising the same

There is provided a racing tire improving grip performance, processability and rubber strength at a high temperature in highly good balance and a rubber composition capable of producing a tread having thereof. A rubber composition comprising 70 to 150 parts by weight of carbon black with a nitrogen adsorption specific area of 100 to 300 m/g based on 100 parts by weight of a rubber component comprising a solution polymerization styrene-butadiene rubber satisfying the formula below:(Vinyl content)&#x2267;100&#x2212;2&#xd7;(styrene content),30 to 170 parts by weight of a softener and 1 to 30 parts by weight of a compound satisfying the general formula (1):&#x2014;(R&#x2014;S)&#x2014;&#x2003;&#x2003;(1)(wherein R is&#x2014;(CH&#x2014;CH&#x2014;O)&#x2014;CH&#x2014;CH&#x2014;, x is an integer of 3 to 6, n is an integer of 10 to 400 and m represents an integer of 2 to 5.).

Rubber composition and racing tire having tread comprising thereof

A lightweight tire with reduced rolling resistance and improved steering stability without decreasing tire durability, said tire containing a sidewall made of a rubber composition including 20 to 70 parts by weight of an inorganic filler, and 5 to 35 parts by weight of polypropylene powder, based on 100 parts by weight of a rubber component, which satisfies the following equation: (amount of polypropylene powder).gtoreq.(amount of inorganic filler+amount of polypropylene powder)/2.

Rubber composition for tire sidewalls and pneumatic tires using the same

A pneumatic tire is disclosed having an improved electric conductivity and an excellent rolling resistance, which includes a tread and a conductive thin film provided on the surface of the tread continuously in the circumferential direction of the tire, wherein the conductive thin film has a thickness of not more than 0.5 mm and a volume resistivity of not more than 10 &OHgr;&middot;cm, and the tread is made from a rubber composition comprising a diene rubber and 40 to 100 parts by weight of silica having a BET specific surface area of 100 to 300 m /g per 100 parts by weight of the diene rubber, the content of silica being at least 50% by weight based on the whole filler incorporated in the composition. The conductive thin film may be prepared from a rubber composition comprising at least 10 parts by weight of carbon black per 100 parts by weight of a rubber.

Pneumatic tire having improved static discharge characteristics

Paper-feeding roller

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

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.

Rubber composition for tire tread

A rubber composition of the present invention can be obtained by kneading;

Rubber composition for tire sidewall and tire

A rubber composition for a tire tread includes an organosiloxane-modified diene polymer or a blend of the organosiloxane-modified diene polymer with another diene polymer and a silica or a mixture of the silica and carbon black, the organosiloxane-modified diene polymer being obtained by (a) polymerizing a diene monomer alone or a mixture of the diene monomer and aromatic vinyl monomer by the use of an alkali metal-containing polymerization initiator in a hydrocarbon solvent to give a diene polymer having an alkali metal-containing active end, and (b) reacting the alkali metal-containing active end of the diene polymer with an organosiloxane having at least one functional group selected from epoxy, alkoxyl, carbonyl, vinyl, chloro, bromo and iodo groups. The rubber composition for a tire tread is superior in processability and has both low rolling resistance and high wet-skid resistance by employing a decreased amount of a silane coupling agent.

A rubber composition of tire tread, which comprises an emulsion-polymerized styrene-butadiene rubber with a bonded styrene content of not less than 40% by weight which is contained in an amount of 10 to 100% by weight in a rubber component, and a sodium-containing basic inorganic compound and/or a basic sodium salt of organic acid which is blended in an amount of 0.5 to 5.0 parts by weight per 100 parts by weight of the rubber component. Safe driving at a high speed can be realized by using the rubber compositions.

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Kobe, Japan

Toshiro Matsuo