Radial tire with a sidewall having a three-layer structure

Details Radial tire with a sidewall having a three-layer structure Radial tire with a sidewall having a three-layer structure

1989-05-25

1992-02-18

Ball, Michael W.

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

152555, 525211, 525237, B60C 1300, B60C 100, C08L 4500

Patent

active

050885375

ABSTRACT:
The invention relates to a radial tire in which each sidewall covering and protecting the side face of the carcass is composed of a plurality of layers differing in rubber composition. In the radial tire according to the invention, the sidewall has a three-layer structure consisting of an adjesive layer adjacent to the carcass, an inner layer disposed outwardly thereon and an outer layer disposed further outwardly thereon. The rubber components in the rubber compositions respectively constituting the three layers differ in proportions of the rubber having as low degree of unsaturation and the rubber having a high degree of unsaturation and the high-unsaturation rubber content decreases in the order of adhesive layer, inner layer and out layer. While retaining the endurance characteristics and ozone resistance of the conventional tires, the radial tire according to the invention is improved in that its good appearance can be prevented from being spoiled by staining or discoloration of its side portions. In spite of the use of rubbers having a low degree of unsaturation, the invention provides a radial tire having sidewalls excellent in adhesiveness to the carcass and other portions made of a diene rubber composition.

REFERENCES:
patent: 3653423 (1972-04-01), Paddock
patent: 3830274 (1974-08-01), Waser, Jr.
patent: 3937862 (1976-02-01), Dillenschneider
patent: 4004627 (1977-01-01), Sandstrom et al.
patent: 4224196 (1980-09-01), Gursky
patent: 4645793 (1987-02-01), Von Hellens et al.
patent: 4804028 (1989-02-01), Botzman

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