The Yokohama Rubber Co., Ltd.

Takao Muraki

Kinya Kawakami

Kazuyoshi Kayama

Tomohiko Kogure

Yasushi Kikuchi

Yasuhiro Ishikawa

Masayoshi Daio

Shigeru Shinoda

Issey Nakakita

Hiroyuki Kaidoo

Kinya Kawakumi

A rubber composition for a tire tread comprising (i) 100 parts by weight of a rubber component comprising (a) natural rubber and (b) a styrene-butadiene copolymer rubber having a vinyl content in the butadiene portion of 35 to 80% by weight and a styrene content of 10 to 40% by weight wherein the total amount these rubbers is at least 80 by weight of the total rubber component and wherein the amount of the styrene-butadiene copolymer rubber, is 20 to 60% by weight of the total rubber component, (ii) 20 to 70 parts by weight of silica and (iii) 20 to 70 parts by weight of carbon black.

Rubber composition for tire tread

A pneumatic tire having a bead in which an end portion of a carcass layer is bent from an inner portion to an outer portion of the tire so as to be turned up around a bead core, a reinforcing layer which consists of reinforcing cords covered with coating rubber being provided so as to extend along a turnup portion of the carcass layer, the hardness of the coating rubber in the reinforcing layer is set in the range of JIS Hs 65-95.

Pneumatic tire with reinforcing layer embedded in a defined rubber

Rubber compositions are disclosed for automobile tire treads. One or more SBR rubbers of higher than -40.degree. C. in Tg are combined with carbon black of specified N.sub.2 SA, DBP, .DELTA.DBP and .DELTA.Dst qualities. The resulting composition has enhanced tan .delta. at 0.degree. C. and 60.degree. C., breaking strength, breaking energy and abrasion resistance characteristics.

Rubber compositions for tire treads of driving stability

Rubber compositions for use in tire treads are disclosed. One or more selected styrene-butadiene rubbers of specified glass transition temperatures are blended with a selected type of carbon black of specified physical characteristics. The composition is highly stable in runnability on dry, wet and snowy roads.

Rubber composition for automobile tires

Rubber compositions are disclosed for use in tread portions of automotive tires. A selected class of starting rubbers are combined with specified amounts of a selected type of carbon black having well balanced N.sub.2 SA, DBP, .DELTA.DBP and .DELTA.Dst properties. The use of this carbon black is conducive to enhanced driving stability and other important physical characteristics.

Rubber compositions for tire treads

Rubber compositions are disclosed for use in the tread portions of automotive tires. A selected class of starting rubbers are combined with specified amounts of a selected type of carbon black having well balanced N.sub.2 SA, 24M4DBP and .DELTA.Dst properties. The use of this carbon black is conductive to enhanced driving stability and other important physical characteristics of the tire.

Rubber compositions for tire tread

Rubber compositions are disclosed which exhibit enhanced dynamic modulus and tensile strength characteristics. A selected type of carbon black, resorcinsol and/or its precondensate and hexamethoxymethyl melamine are combined in specified amounts with a selected class of starting rubbers. The carbon black has specified nitrogen adsorption surface area, dibutyl phthalate adsorptivity and Dst mode of diameter.

Rubber compositions containing carbon blacks of specified physical

Rubber compositions for use in tire treads are disclosed which are essentially made up of natural and/or a selected class of polyisoprene rubbers of specified cis contents and a selected class of styrene-butadiene rubbers of specified styrene and 1,2-bond contents. The composition has a unique viscoelasticity curve, exhibiting sufficient wet skid resistance and adequate fuel saving.

Rubber compositions particularly for use in automobile tire treads comprise a selected class of starting rubbers and specified amounts of a selected types of carbon black, this filler having specified values of IA, N.sub.2 SA/IA and .DELTA.D.sub.50 (Dst). The resulting tire excels in abrasion resistance, rebound resilience, antiskidding on wet, snowy and icy roads and fuel economy thus contributing to efficient and safe driving in all seasons.

Growing community of inventors

Hiratsuka, Japan

Takao Muraki