Silica reinforced rubber compostition and tire with tread thereof
AssigneeThe Goodyear Tire & Rubber Company
InventorsPaul H. Sandstrom, Lawson G. Wideman
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Abstract
The present invention relates to a rubber composition containing silica reinforcement and to pneumatic tires having treads comprised of such rubber composition. A rubber composition comprises at least one elastomer, silica, carbon black and a silica coupler comprised of 3,3'-tetrathiodipropionitrile polysulfide mixture.
Claims18
A rubber composition comprised of (A) 100 parts by weight of at least one diene-based elastomer, (B) about 25 to about 100 phr of filler composed of particulate, precipitated silica and carbon black, and (C) a silica coupler selected from (i) 3,3'-tetrathiodipropionitrile polysulfidic mixture containing 2 to 8 sulfur atoms per polysulfidic bridge or from (ii) a combination of about 95 to about 25 weight percent 3,3'-tetrathiodipropionitrile polysulfide mixture and, correspondingly, about 5 to about 75 weight percent of bis-(3-trialkoxysilylalkyl) polysulfide containing from 2 to 8 sulfur atoms in its polysulfide bridge wherein the weight ratio of said silica coupler to silica is in a range of about 0.01/1 to about 0.2/1;
- wherein the weight ratio of silica to carbon black, is at least about 0.1/1.
A rubber composition comprised of (A) 100 parts by weight of at least one diene-based elastomer, (B) about 25 to about 90 phr particulate silica, (C) up to about 30 phr carbon black, and (D) a silica coupler which is collectively composed of about 90 to about 55 weight percent 3,3'-tetrathiodipropionitrile polysulfidic mixture, about 10 to about 45 weight percent of bis-(3-triethoxysilylpropyl)tetrasulfide and bis-(3-triethoxysilylpropyl)trisulfide wherein the weight ratio of said silica coupler to silica is in a range of about 0.01/1 to about 0.2/1;
- wherein the weight ratio of silica to carbon black is in a range of about 3/1 to about 30/1;
- wherein the silica is characterized by having a BET surface area in a range of about 50 to about 300 square meters per gram and a dibutylphthalate (DBP) absorption value in a range of about 150 to about 300.
Dependencies are inferred from the claim text.