Bridgestone Corporation

Bridgestone Tire Company Limited

Nippon Shokubai Kagaku Kogyo Co., Ltd.

Toru Tsuda

Toshio Hayakawa

Yasuo Himuro

Ichiro Takahashi

Hisao Ushikubo

Misao Kawabata

Kenichi Motomura

Hidenori Masuda

Toru Sasagawa

Hiroshi Kojima

Kazuhiro Tanaka

Hideaki Nishio

Toshiaki Kobayashi

Seiji Ito

Yuki Hara

Yasuhiro Hamada

Tetsuhito Tsukagoshi

Kazuo Kodama

Yasutaka Enoki

Yuji Tateo

Yutaka Yamaguchi

Masahiro Takayama

Kazutomo Takahashi

Yasufumi Ichiki

Shinichi Watanabe

Yuji Sakamaki

Toyomi Iwata

Masato Hiruma

Masayuki Tokutake

Tsuguyoshi Yamada

Pneumatic radial tire with load bearing rubber reinforcing layer

A method for the production of an aqueous dispersion of a long-chain alkyl graft polymer, which method comprises mixing an aqueous solution of a polyamine with a long-chain alkyl isocyanate and stirring the resultant mixture thereby causing reaction of said component reactants, and an aqueous release agent formed therefrom.

Method for production of aqueous dispersion of long-chain alkyl graft

A pneumatic radial tire has a double crown structure that an annular recess portion is arranged in a tread at a given region in a widthwise direction thereof, in which the tread is divided into a central region, a pair of middle regions and a pair of side regions and at least one auxiliary reinforcing cord layer is arranged on a belt so as to substantially envelop a crown portion of a carcass and a full radially outer surface of the belt, provided that a stretching ratio of the cords in the auxiliary reinforcing cord layer in the central region and side regions is equal to or more than that in the middle regions, whereby high-speed durability is improved together with excellent drainage while controlling the increase of tire weight and cost as much as possible.

Pneumatic radial tires including an annular recess portion in the tread

A pneumatic radial tire comprises a tread provided with a plurality of circumferential grooves extending in a circumferential direction of the tire, and plural rows of land portions defined between axially adjacent circumferential grooves and between each of edges of the tread and the adjacent main circumferential groove. That groove wall of at least the circumferential groove located nearest to at least one of the tread edges on a treading surface of the tread which is positioned on a side of the one of the tread edges is inclined to gradually increase a width of the groove toward the surface of the tread from a location spaced by 10-70% of a depth of the circumferential groove radially outwardly from a bottom thereof. The width of an opening of the circumferential groove to the surface of the tread is in a range of 3-18 mm.

Pneumatic radial tires

Automobile tire

A pair of radial tires consist of two tires each having a tread comprising annular land portions formed by a plurality of circumferential main grooves extending in the circumferential direction of the tire, and rows of blocks formed by extending transverse main grooves inclinedly in the circumferential direction in at least land portions located at axially opposite side edge portions of the tire. Tread patterns of these two tires are asymmetrical and have directional property. Transverse main grooves of each of the tires, which define the rows of the blocks to be located axially inside, are extended inclinedly downwardly toward the inner side of the tread in the width direction as viewed from the front side of the tire. Each of the transverse main grooves of the tire, which define the row of the blocks located axially on the outer side is extended in an almost inverse V-letter shape as viewed from the front side of the tire.

Pair of radial tires with directional and symmetrical tread patterns

Growing community of inventors

Tokyo, Japan

Toru Tsuda