The B. F. Goodrich Company

Zion S Lee

John M Swarts

Shamim Ahmad

Stephen E Katrenick

A pneumatic tire is produced for off-the-road use having a tread formed from a silica-free rubber tread compound consisting essentially of particular types of rubber, and at least 55 phr of a particular high structure, fine particle carbon black having a CTAB from 130-150 m.sup.2 /g, N.sub.2 adsorption of 140-160 m.sup.2 /g, a tint of 125-140%, a DBPA of 120-140 ml/100 g, and a mean particle diameter of about 24 nanometers; and, from about 4 to about 8 phr of processing oil, antioxidant/antiozonants, curing agents and activators each present in an amount less than 10 phr. The result is a tire with substantially better cutting and chipping resistance than an identically produced tire with a tread containing silica in combination with a carbon black having essentially the same mean particle diameter but lower structure, without any noticeable loss in treadwear, or with an improvement in treadwear, that is, less loss due to treadwear.

Cutting and chipping resistant tread for heavy service pneumatic

A rubber composition containing reinforcing pigment some of which is preferably silica pigment, sulfur, a vulcanization accelerator, litharge, and a cobalt salt, when coated on brass plated steel cords and vulcanized, adheres tenaciously and permanently to the cords, without the erratic adhesion previously obtained or loss of adhesion in humid atmospheres. A further improvement in adhesion is obtained by including a resorcinol resin in the composition.

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Munroe Falls, OH, United States of America

Zion S Lee