Bridgestone Corporation

Ichiro Wada

Shun Nakamura

Tadashi Saito

Norio Inada

Isamu Imai

Toshihiro Yotsumoto

Toshiki Takizawa

Yasuyoshi Kawaguchi

Shigeyuki Toki

Maki Sato

Osamu Uchino

Naofumi Ezawa

Joji Yatsunami

Masashi Ohara

Toshiaki Koura

Motoaki Kanoh

The rubber composition of the present invention is used for producing an inner liner of a pneumatic tire, and is obtained by compounding a rubber component and a layered or plate-like mineral. The layered or plate-like mineral has an aspect ratio of 3 or more and less than 30. The present invention further provides a production method of the rubber composition and a pneumatic tire which is produced by using the rubber composition. The present invention is applicable to a tire of passenger vehicles, bus or truck, and a tire of airplane. According to the present invention, the air permeation resistance is remarkably improved and the workability is also improved. Therefore, the rapture and hole defect of a non-vulcanized sheet during the tire construction can be avoided. By using the rubber composition, the gauge of the inner liner of pneumatic tire can be reduced while maintaining the inner pressure of tire, thereby reducing the weight of tire.

Rubber composition for inner liner

Rubber-reinforcing fiber cords are disclosed which are constituted by at least one kind of fibers selected from a group consisting of aromatic polyamide fibers, entire aromatic polyester fibers and polyvinylalcohol fibers having a tenacity of not less than 15 g/d. Spaces among filaments constituting the cord are each impreganted with a rubbery material. Radial tires are also disclosed which each comprise at least one pair of bead wires, at least one carcass ply cord layer and at least one belt ply cord layer. Carcass ply cords and/or belt ply cords are constituted by the above rubber-reinforcing fiber cords.

Heavy duty pneumatic radial tires using rubber reinforcing fiber cords

A tread rubber composition for high-speed running tires comprises a particular halogenated modified styrene-butadiene copolymer having p-halomethylbenzoyl group as a starting rubber and contains particular amounts of carbon black, process oil and diamine, and has excellent heat resistance and wear resistance.

Rubber composition for tread in high-speed running tires

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Saitama, Japan

Ichiro Wada