Sumitomo Rubber Industries Limited

Sumitomo Electric Industries, Limited

Takafumi Taguchi

Kiyoshige Muraoka

Mamoru Uchida

Kenichi Uesaka

Tetsuya Kunisawa

Yoji Imoto

Naoya Omura

Satomi Yamauchi

Masayuki Sakamoto

Naoya Ichikawa

Susumu Yamamoto

Tatsuhiro Tanaka

Isamu Tsumori

Kenya Watanabe

Tsuyoshi Tsuchida

Hidekazu Nakata

Toru Iizuka

Yoshifumi Nishimura

Sakae Okubo

Yoshihiro Kagawa

Tomoo Tanaka

Noboru Okabe

Takuma Konishi

Shuji Imaoka

Reika Otake

A method for producing a rubber member according to the present invention includes the steps of: supplying a rubber composition to a cylinder provided in an extruder; extruding the rubber composition to a downstream side of the cylinder while kneading the rubber composition in an internal space of the cylinder that includes a plurality of protruding members protruding from an inner wall surface of the cylinder; compressing the rubber composition at least once in the step of extruding the rubber composition to the downstream side; discharging a gas generated from the compressed rubber composition to outside of the cylinder; discharging, through a discharge outlet of the cylinder, the rubber composition after the gas has been generated; and molding the rubber composition that has been discharged through the discharge outlet into a predetermined rubber member shape.

Method for producing rubber member

The present invention provides a rubber composition that can enhance the fuel economy, wet-grip performance, abrasion resistance, and processability in a balanced manner, and also provides a pneumatic tire using this rubber composition. The present invention relates to a rubber composition that contains a rubber component, silica, and a compound represented by formula (1) below, wherein the rubber component contains, based on 100% by mass of the rubber component, not less than 5% by mass of a conjugated diene polymer containing a constituent unit based on a conjugated diene and a constituent unit represented by formula (I) below, at least one terminal of the polymer being modified with a specific compound; and an amount of the silica is 5 to 150 parts by mass per 100 parts by mass of the rubber component. 

Rubber composition and pneumatic tire

The invention provides a rubber composition that can enhance fuel economy, wet-grip performance, abrasion resistance, and handling stability in a balanced manner, and a pneumatic tire using this composition. The invention relates to a rubber composition containing a rubber component, silica (1) having a nitrogen adsorption specific surface area of not more than 100 m/g, and silica (2) having a nitrogen adsorption specific surface area of at least 180 m/g, wherein the rubber component contains, based on 100% by mass of the rubber component, at least 5% by mass of a conjugated diene polymer containing a constituent unit based on a conjugated diene and a constituent unit represented by formula (I) below, at least one terminal of the polymer being modified with a specific compound; and a total amount of silica (1) and silica (2) is 30-150 parts by mass per 100 parts by mass of the rubber component, 

The present invention provides a rubber composition that can enhance the fuel economy, wet-grip performance, and abrasion resistance in a balanced manner, and a pneumatic tire using this rubber composition. The present invention relates to a rubber composition that contains a rubber component, silica, and a silane coupling agent, wherein the rubber component contains, based on 100% by mass of the rubber component, not less than 5% by mass of a conjugated diene polymer containing a constituent unit based on a conjugated diene and a constituent unit represented by formula (I) below, at least one terminal of the polymer being modified with a specific compound; an amount of the silica is 5 to 150 parts by mass per 100 parts by mass of the rubber component; and the silane coupling agent contains a mercapto group. 

The present invention relates to a pneumatic tire having an inner liner formed from a rubber composition that includes a butyl rubber in which the Mooney viscosity measured at 130&#xb0; C. of an unvulcanized rubber of the rubber composition is at least 45, wherein the average value and standard deviation of the butyl rubber gauge of shoulder portion of a finished tire satisfy: (Standard deviation of butyl rubber gauge)/(Average value of butyl rubber gauge)&#x2266;0.060. The rubber gauge of the tire exhibits improved uniformity and is superior in air permeability resistance.

Pneumatic tire with specified inner liner

The present invention provides a rubber composition for a tread which enables improvement in fuel economy, breaking performance, and abrasion resistance in a balanced manner; a method for producing the rubber composition; and a heavy-load tire. The present invention relates to a rubber composition for a tread of a heavy-load tire, including a modified natural rubber having a phosphorus content of 200 ppm or less, and carbon black.

Rubber composition for tread, method for producing the same, and heavy-load tire

A rubber composition tire containing 0.1 to 10 parts by mass of zinc oxide particles having an average particle diameter of not more than 200 nm with respect to 100 parts by mass of a rubber component and a pneumatic tire employing the same are provided. This rubber composition for a tire can be suitably employed for manufacturing tread rubber, base tread rubber, bead apex rubber, clinch rubber and inner liner rubber for a tire.

Rubber composition for tire and pneumatic tire

The present invention provides a rubber composition for a sidewall excellent in appearance and weather resistance, and a tire having a sidewall prepared by using the rubber composition. The rubber composition for a sidewall of the present invention comprises 45 to 60 parts by weight of a carbon black, not more than 1.5 parts by weight of powder sulfur, not more than 0.75 part by weight of a sulfenamide vulcanization accelerator and 0.7 to 1.5 parts by weight of paraffin wax in which the distribution of the number of carbon atoms is 20 to 50, the ratio (iso content/normal content) of iso content to normal content is 5/95 to 20/80, the standard deviation/average number of carbon atoms of the iso content is 1.0 to 1.8 and the standard deviation/average number of carbon atoms of the normal content is 1.0 to 1.8, based on 100 parts by weight of a rubber component comprising a butadiene rubber in an amount of 35 to 55% by weight and a natural rubber.

Rubber composition for sidewall and pneumatic tire having sidewall using same

A composite material comprising a rubber composition and a metal material, wherein the rubber composition contains, per 100 parts by weight of rubber, a cobalt salt of an organic acid in an amount up to 0.5 parts by weight, 3 to 6 parts by weight of sulfur, and N-oxydiethylene-2-benzothiazolylsulfenamide or N-tert-butyl-2-benzothiazolylsulfenamide as a vulcanization accelerator, and the metal material is provided with a plating of a ternary alloy consisting of copper, zinc, and nickel.

Composite material of metal and rubber for use in industrial rubber

A composite material comprising a rubber composition and a metal material, wherein the rubber composition contains, per 100 parts by weight of rubber, 0 part by weight of a metal salt of an organic acid, 3 to 6 parts by weight of sulfur, and N-oxy-diethylene-2-benzothiazolylsulfenamide or N-tert-butyl-2-benzothiazolylsulfenamide as a vulcanization accelerator, and the metal material is provided with a plating of a ternary alloy consisting of copper, zinc, and nickel.

Composite material of metal and rubber

A composite material comprising a rubber composition and a metal material, wherein the rubber composition contains, per 100 parts by weight of rubber, 0 to 0.5 part by weight of a cobalt salt of an organic acid, 3 to 6 parts by weight of sulfur, and N-oxydiethylene-2-benzothiazolylsulfenamide or N-tert-butyl-2-benzothiazolylsulfenamide as a vulcanization accelerator, and the metal material is provided with a plating of a ternary alloy consisting of copper, zinc, and nickel.

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Kobe, Japan

Takafumi Taguchi