Bridgestone Corporation

Masashi Ohara

Shun Nakamura

Yasuyoshi Kawaguchi

Eiji Takiguchi

Ichiro Wada

Naofumi Ezawa

Osamu Uchino

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

A low noise level tire includes a carcass composed of at least one ply toroidally extending between a pair of bead cores, and a tread arranged radially outwardly of the carcass and composed of an outer cap rubber layer and an inner base rubber layer. The cap rubber layer is made of a rubber having a dynamic storage modulus of not less than 1.0&times;10,dyn/cm,and not more than 2.0&times;10,dyn/cm,and a loss tangent more than 0.15 and not more than 0.35. The base rubber layer is made of a rubber having a dynamic storage modulus of not less than 1.2&times;10,dyn/cm,and not more than 2.2&times;10,dyn/cm,and a rate of foaming of not less than 5% and not more than 50%.

Low noise level tire

Growing community of inventors

Saitama, Japan

Masashi Ohara