Ppg Industries, Inc.

Thomas J Doran, Jr

Henry C Stevens

David B Russell

Abrasion-resistant vulcanized rubber compositions which are also resistant to heat build-up are provided which are useful as tire treads and subtreads for vehicles, e.g., automobiles. The compounds comprise the vulcanizate of a rubber polymer, a finely-divided reinforcing siliceous pigment, and an organic coupling agent having at least one nitrogen functional group that bonds to the siliceous pigment and at least one sulfur functional group that bonds to the rubber polymer.

Rubber additive of silica and organic coupling agent

Abrasion-resistant vulcanizates are provided comprising a rubber, a finely-divided reinforcing siliceous pigment, a compound having a plurality of reactive amino groups, an aromatic hydroxy compound, and a methylene donor. Rubber additives are provided comprising a finely-divided siliceous pigment having adsorbed thereon at least one but not more than two of the group selected from a compound having a plurality of reactive amino groups, an aromatic hydroxy compound, and a methylene donor.

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Norton, OH, United States of America

Thomas J Doran, Jr