The Yokohama Rubber Co., Ltd.

Nippon Zeon Company, Ltd.

Hiroshi Hirakawa

Makoto Misawa

Asahiro Ahagon

Iwao Sugiyama

Kunio Kageyama

Yoshiaki Someya

Mitsuharu Iwakura

Kazuo Miyasaka

Masatake Ozaki

Shuichi Akita

Akio Ueda

Hiroyuki Hamada

Yasuhiro Ishikawa

Hajime Satoh

Shinji Kawakami

Teruhide Furuhama

Norimichi Takanashi

Takekazu Inoue

Masao Inoue

Fumiaki Nagano

A rubber-rubber bonded composite structure is made up of one unvulcanized preform formed from a rubber comprising hydrogenated acrylonitrile-butadiene rubber, either a combination of methacrylic acid and zinc oxide or zinc methacrylate, and an organic peroxide and another unvulcanized preform formed from a rubber composition containing a rubber in common use, both preforms having been laminated together into an integrally bonded structure by vulcanization. The resulting structure exhibits good rubber-to-rubber adhesion.

Rubber-rubber bonded composite structure

A rubber-rubber bonded composite structure is made up of one unvulcanized preform formed from a rubber comprising hydrogenated acrylonitrile-butadiene rubber, either a combination of methacrylic acid and zinc oxide or zinc methacrylate, and an organic peroxide and another unvulcanized preform formed from a rubber composition containing a rubber in common use both preforms having been laminated together into an integrally bonded structure by vulcanization. The resulting structure exhibits good rubber-to-rubber adhesion.

The energy absorbing structure of the present invention comprises a cylindrical hollow body of a fiber reinforced thermoplastic resin wherein both the ends are open, the cylindrical hollow body being attached to the outer wall of a moving body or the outer wall of a stationary body with which the moving body comes in contact in such a manner that the opening of the hollow body faces the outer wall.

Energy absorbing structure

A pneumatic tire for automobile having an inner liner of a thin film of ultra high molecular weight polyethylene, which film is laminated directly over an inner wall of green tire and firmly bonded thereto when the tire is vulcanized.

Pneumatic tire with inner liner of ultra high molecular weight

Rubber compositions suitable for tire treads are disclosed. Starting rubbers made up of at least one SBR of -20.degree. C. to -40.degree. C. in Tg and at least one SBR of lower than -45.degree. C. in Tg are blended with specified amounts of carbon blacks having a N.sub.2 SA of more than 120 m.sup.2 /g and of softeners having a VGC of 0.90 to 0.98, whereby the compositions are provided with a storage shear modulus of less than 500 MPa at -30.degree. C. The compositions are excellent in friction performance, abrasion resistance and low-temperature resistance.

Rubber compositions for tire treads

A radial tire having an under-tread layer between a cap tread and a breaker layer is disclosed. As the material for the cap tread, a rubber composition is employed which contains 0.5 to 1.6 parts by weight of sulfur per 100 parts by weight of starting rubber components consisting of 25 to 75 parts by weight of polybutadidne rubber having 65 to 90 mol % of 1,2-bonding units and 75 to 25 parts by weight of natural rubber and/or polyisoprene rubber, and which has elongation at break of at least 330% at 100.degree. C. A rubber composition containing 1.6 to 10 parts by weight of sulfur per 100 parts by weight of rubber components is used for the under-tread layer.

Radial tire

A process for preparing a rubber composition for tire treads having resilience, wet skid resistance and wear resistance well balanced with each other, by mechanically mixing a specific amount in total of a halogenated butyl rubber, natural rubber or a polyisoprene rubber and a polybutadiene rubber with a specific amount of carbon black and with other additives in the first mixing step and then mechanically mixing the resulting mixture with the remainder of the rubber ingredients and carbon black in the second mixing step thereby to obtain the rubber composition.

Process for preparing rubber compositions for tire treads

A rubber composition for tire treads having improved rolling resistance and wet road braking performance, comprising (I) a chlorinated butyl rubber and/or a brominated butyl rubber, (II) natural rubber and/or a polyisoprene rubber and, if desired, (III) a polybutadiene rubber in specific blending ratios.

Rubber compositions for tire treads having low rolling resistance

A process for preparing a tire tread rubber composition having improved rolling resistance and wet skid resistance comprising [I] 100 parts by weight of a rubber material composed of 25 to 75% by weight of substantially amorphous polybutadiene having a 1,2-bond unit content of 65 to 90 mole % and a Mooney viscosity (ML.sub.1+4, 100.degree. C.) of 20 to 100 and 75 to 25% by weight of natural rubber and/or cis-1,4-polyisoprene, and [II] 40 to 70 parts by weight of carbon black, said process comprising (1) mechanically compounding 40 to 60 parts by weight of the rubber material [I] with 40 to 70 parts by weight of carbon black [II], and then (2) adding to the resulting mixture the rubber material [I] in an amount sufficient to adjust the amount of the carbon black [II] to 40 to 70 parts by weight per 100 parts by weight of the rubber material [I] and mechanically compounding them.

Process for preparing rubber composition for tire treads

A tread composition for low rolling resistance tires, comprising 100 parts by weight of styrene-butadiene rubber or a styrene-butadiene rubber-based rubber blend and 3.2-5.0 parts by weight of sulphur.

Tread compositions for tires having low rolling resistance

Rubber compositions containing therein as a source of carbon disulfide at least one compound selected from the group consisting of cyclic bis (thiocarbamoyl) mono- or di-sulfides, cyclic bis (thioxanthogenyl) mono- or di-sulfides, and cyclic (thiocarbamoyl-thioxanthogenyl) mono- or di-sulfides and an amine-isocyanate addition compound as a vulcanization accelerator system having excellent scorching stability with rapid vulcanization at usual vulcanization temperatures.

Vulcanization accelerator system for rubber compositions

Rubber compositions containing therein as a source of carbon disulfide a compound selected from the group consisting of cyclic bis (dithiocarbamic acid) metal salts and cyclic or non-cyclic dithiocarbamic-xanthogenic acid metal salts and an amine-isocyanate addition compound as a vulcanization accelerator system having excellent scorching stability with rapid vulcanization at usual vulcanization temperatures.

Rubber compositions containing an alkylene-bisdithiocarbamate and an amine-isocyanate addition compound as a vulcanization accelerator having excellent scorching stability with rapid vulcanization at usual vulcanization temperatures.

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Isehara, Japan

Hiroshi Hirakawa