US 4,396,052 AGranted

Radial tire

AssigneeThe Yokohama Rubber Co., Ltd.

InventorsAsahiro Ahagon, Norimichi Takanashi, Hiroshi Hirakawa

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Abstract

A radial tire having an under-tread layer between a cap tread and a breaker layer is disclosed. As the material for the cap tread, a rubber composition is employed which contains 0.5 to 1.6 parts by weight of sulfur per 100 parts by weight of starting rubber components consisting of 25 to 75 parts by weight of polybutadidne rubber having 65 to 90 mol % of 1,2-bonding units and 75 to 25 parts by weight of natural rubber and/or polyisoprene rubber, and which has elongation at break of at least 330% at 100.degree. C. A rubber composition containing 1.6 to 10 parts by weight of sulfur per 100 parts by weight of rubber components is used for the under-tread layer.

Claims2

Dependent claims

A radial tire having an under-tread layer interposed between a cap tread and a breaker layer wherein:

(a) said cap tread consists of a rubber composition having an elongation at break at 100.degree. C. of at least 330% and containing 0.5 to 1.6 parts by weight of sulfur based on 100 parts by weight of starting rubber components, said starting rubber components consisting of 25 to 75 parts by weight of essentially amorphous polybutadiene rubber having 65 to 90 mol% of 1,2-bonding units and 75 to 25 parts by weight of natural rubber and/or polyisoprene rubber;
(b) said under-tread layer consists of a rubber composition containing 1.6 to 10 parts by weight of sulfur based upon 100 parts by weight of rubber components;
and
(c) said breaker layer contains 3 to 10 parts by weight of sulfur on the basis of 100 parts by weight of rubber component.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 06/256,580Filed 22 Apr 1981
Priority: JP 55-7874611 Jun 1980
Granted: 2 Aug 1983
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B60C 1/0016
Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition: compositions of the tread
B60C 9/18
Reinforcements or ply arrangement of pneumatic tyres: structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
Y02T 10/86
Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies: optimisation of rolling resistance, e.g.…
Y10T 152/1081
Characterized by belt or breaker structure: breaker or belt characterized by the chemical composition or physical properties of elastomer or the like

Family

No related US applications are recorded in the indexed filing history.

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