Sumitomo Rubber Industries Limited

Other

Sumitomo Electric Industries, Limited

Sumitomo Chemical Company, Limited

Mamoru Uchida

Takayuki Hattori

Takao Wada

Tomoaki Hirayama

Kiyoshige Muraoka

Naohiko Kikuchi

Takafumi Taguchi

Narihiro Tahara

Yuichi Saito

Yoichi Mizuno

Shuichi Sakamoto

Takeshi Ota

Shinichi Miyazaki

Susumu Yamamoto

Tetsuya Kunisawa

Hidehiko Hino

Hidekazu Nakata

Satoru Nippa

Masato Kawase

Akira Minagoshi

Takeshi Ohta

Yoshifumi Nishimura

Youjirou Miki

Youichi Mizuno

Hideo Nobuchika

Syuichi Yamamori

Takehiro Tomita

The objective of the present invention is to provide a pneumatic tire that can desirably prevent generation of static electricity between the road face and the tire, while maintaining a low rolling resistance, so that the safety in use is further improved. In pneumatic tire of the present invention, each of tread rubber, breaker rubber and sidewall rubber that are respectively formed on a tread section, a breaker section and a sidewall section has a volume resistivity of 1&#xd7;10&#x3a9;&#xb7;cm or more, with a conductive layer having a volume resistivity smaller than 1&#xd7;10&#x3a9;&#xb7;cm and a thickness in a range from 0.2 to 2.0 mm being formed between a carcass ply forming the carcass and the sidewall rubber, and at least either conductive layer or a rubber cement layer that is formed so as to be made in contact with conductive layer and has a volume resistivity lower than that of the tread rubber is exposed to the surface of the tire.

Pneumatic tire having conductive layer and rubber cement layer

A rubber composition for coating a steel cord, in which processability, durability and adhesive condition can be improved with favorable balance, and a tire using the rubber composition are provided. The rubber composition for coating a steel cord comprises 40 to 70 parts by weight of silica having a nitrogen adsorbing-specific surface area of 100 to 200 m/g, 1 to 15 parts by weight of a silane coupling agent, 12 to 20 parts by weight of zinc oxide, 3.5 to 5 parts by weight of sulfur, and an organic cobalt in an amount of 0.05 to 0.3 part by weight, converted into metal cobalt amount, on the basis of 100 parts by weight of a rubber component, and a tire is prepared using the rubber composition.

Rubber composition for coating steel cord and tire using the same

The present invention provides a rubber composition for coating a textile cord, and a tire using the rubber composition, wherein rolling resistance is lowered, and processability and rubber strength are excellent, as compared with a rubber composition for coating a textile cord comprising raw materials derived from petroleum resources as a main component, and a tire using the rubber composition, while considering environments and providing for the future decrease in petroleum resources supply. The rubber composition for coating a textile cord comprises 25 to 80 parts by mass of silica and 1 to 15 parts by mass of a silane coupling agent on the basis of 100 parts by mass of a diene rubber, wherein a nitrogen adsorbing-specific surface area of said silica is 70 to 150 m/g.

Rubber composition for coating textile cord and tire using the same

A pneumatic tire is equipped with at least a tread part, a sidewall part, a bead part, and a carcass extending from tread part through sidewall part to bead part, and provided with a breaker part on the outside of carcass in the radial direction of the tire. The volume resistivity of each of a tread rubber, a sidewall rubber, a breaker rubber, and a carcass rubber formed in the tread part, the sidewall part, the breaker part, and the carcass respectively is set to 1&#xd7;10&#x3a9;&#xb7;cm or more. A conductive layer having volume resistivity of 1&#xd7;10&#x3a9;&#xb7;cm or less is provided between a carcass ply constituting the carcass and the sidewall rubber and has an exposed part to the tire surface. A rubber cement layer contacting with at least a part of the exposed part of the conductive layer and at least a part of the region that becomes a grounding surface in the tread part to the road surface is provided.

Pneumatic tire having conductive layer and rubber cement layer including compound having oxyethylene unit

There is provided a rubber composition for a tread having excellent hardness and improving the processability and grip performance of a tire, and a tire comprising thereof. A rubber composition for a tread comprising 30 to 80 parts by weight of silica having a BET specific surface area of less than 150 m/g and 10 parts by weight or less of carbon black based on 100 parts by weight of a rubber component comprising an epoxidized natural rubber, and a tire comprising thereof.

Rubber composition for tread and tire comprising thereof

A rubber composition for an inner liner improving rolling resistance performance of a tire and further improving processability is provided. A rubber composition for an inner liner comprising at least 30 parts by weight of silica having a BET specific surface area of less than 150 m/g and at most 5 parts by weight or less of carbon black based on 100 parts by weight of a rubber component comprising a natural rubber and a tire having an inner liner comprising the same.

Rubber composition for inner liner and tire comprising the same

There is provided a rubber composition in which strength and weather resistance are improved and the use of petroleum resource is suppressed as much as possible, and a tire comprising thereof. A rubber composition comprising 3 to 12 parts by weight of a pigment derived from resources other than petroleum, 10 parts by weight or less of carbon black and 30 parts by weight or more of silica based on 100 parts by weight of rubber components comprising an epoxidized natural rubber and/or a natural rubber.

Rubber composition and tire comprising thereof

A pneumatic tire is provided with an electrically conductive path extending continuously from a position in the rim contacting surface to a position in the ground contacting surface through a sidewall portion, wherein a sidewall rubber is a high-performance rubber compound and almost-insulative, having a volume resistivity of not less than 1&#xd7;10^8 ohm cm. The electrically conductive path includes a helical path made of an electrically conductive rubber having a volume resistivity of not more than 1&#xd7;10^7 ohm cm. The helical path is disposed axially inside the sidewall rubber and extends spirally around the tire rotational axis. Preferably, the tread rubber, clinch rubber and carcass topping rubber are also almost-insulative high-performance rubber compounds.

Pneumatic tire with electrically conductive helical path

The present invention provides a rubber composition for coating a steel cord, use of which makes it possible to consider an effect on environment, prepare for the future decrease in supply of petroleum resources, suppress generation of air bubbles, reduce rolling resistance, and improve processability, roll workability, adhesion to a steel cord and durability with favorable balance, as compared with a rubber composition for coating a steel cord comprising raw materials derived from petroleum resources as main components, and provides a tire having a belt prepared by using the rubber composition. The rubber composition for coating a steel cord comprises 40 to 80 parts by weight of silica having a nitrogen adsorbing-specific surface area of 100 to 200 m/g, 1 to 15 parts by weight of a silane coupling agent and 0.5 to 3 parts by weight of potassium borate, on the basis of 100 parts by weight of a diene rubber component, and the tire is prepared using the rubber composition.

Rubber composition for coating steel cord and tire having belt using same

There is provided a rubber composition for a side wall, wherein an amount ratio of resources other than petroleum are increased so as to be ecological and take measures for the decrease in supply of petroleum in the future, which further has excellent flex crack resistance and strength. A rubber composition for a side wall comprising 20 to 60 parts by weight of silica based on 100 parts by weight of a rubber component comprising 40 to 80% by weight of a natural rubber and 60 to 20% by weight of at least one rubber selected from the group consisting of a butadiene rubber, a styrene-butadiene rubber and an epoxidized natural rubber, and 4 to 16 parts by weight of a silane compound represented by the following formula:X&#x2014;Si&#x2014;Y(wherein X represents an ethoxy group or a methoxy group, and Y represents a phenyl group or an alkyl group) based on 100 parts by weight of silica.

Rubber composition for side wall

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

There is provided a rubber composition for a tire tread having a remained despersibility of reinforcing agents without increased rubber hardness, an improved performance on snow and ice road, and an improved abrasion resistance, and inhibited from increasing in hardness or inhibited from increasing in hardness with the passage of time. A rubber composition for a tire tread, which comprises (a) a diene rubber, (b) glass fibers, (c) a reinforcing agent, and 1 to 15 parts by weight of (d-1) inorganic powders having a Mohs hardness of less than 6.5 and an average particle-size of less than 25 &#x3bc;m and/or (d-2) silicone rubber powders based on 100 parts by weight of the diene rubber.

Rubber composition for tire tread

A rubber composition which can improve performance on icy and snowy road sufficiently and a tire using the same. The rubber composition comprises 2 to 30 parts by weight of staple fibers having an average fiber diameter of 10 to 100 &#x3bc;m and an average fiber length of 0.01 to 4 mm, and 1 to 10 parts by weight of particles having a Moh's hardness of at least 5 and an average particle size of at most 500 &#x3bc;m based on 100 parts by weight of a diene rubber. The tire of the present invention is prepared by using the rubber composition for tread. Examples of the particle are pumice, quarts, emery and the like.

Tire having tread including glass fibers and particles having Moh's hardness of at least 5

There is provided a studless tire that is excellent especially in performance on a snow or ice road. A studless tire, wherein non-metal staple fibers having an average fiber diameter of 1 to 100 &#x3bc;m and an average length of 0.1 to 5 mm are dispersed in a diene rubber in such a way that the non-metal staple fibers are oriented in a thickness direction of a tread, a complex elastic modulus Ein the thickness direction of the tread and an elastic module Ein a circumferential direction of the tire measured at 25&#xb0; C. satisfy the equation 1.1&#x2266;E/E&#x2266;4, and hardness of the tread rubber measured at &#x2212;10&#xb0; C. is 45 to 75 degrees.

Studless tire having tread including fibers oriented in thickness direction

Disclosed herein is an aluminum hydroxide having specific characteristics, and a tire tread rubber composition and a pneumatic tire employing the aluminum hydroxide, which allow grip performance and abrasion resistance to increase and rolling resistance to decrease and are superior in processibility. The aluminum hydroxide has a loosed bulk density of not more than 0.60 g/cm , a DOP oil absorption of at least 70 cm /100 g and less than 250 cm /100 g, and a BET specific surface area of at least 30 m /g and less than 350 m /g. 5-150 parts by weight of the aluminum hydroxide is blended with 100 parts by weight of a rubber component to obtain the tire tread rubber composition. The rubber component preferably includes at least 60 parts by weight of styrene-butadiene rubber having a styrene content of 20-60% by weight.

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Kobe, Japan

Mamoru Uchida