Patent ID: 7714055
Filing Date: 2010-05-11
Classification: B60C,C08K,C08L,Y10S

Abstract:
1. A pneumatic rubber tire having a circumferential rubber tread where said tread is a rubber composition comprised of a blend of, based on parts by weight per 100 parts by weight (phr), (A) conjugated diene-based elastomers comprised of wherein the Tg of said cis 1,4-polybutadiene elastomer major rubber phase is at least 55° C. lower than the Tg of said emulsion polymerization derived high styrene containing styrene/butadiene elastomer minor rubber phase; and (B) about 35 to about 110 phr of reinforcing filler comprised of from about 5 to about 105 phr amorphous silica and from about 5 to about 105 phr of high structure carbon black reinforcing filler; wherein said high structure carbon black is characterized by having an Iodine value in a range of about 116 to about 135, g/kg together with a DBP (dibutylphthalate) value in a range of about 125 to about 140, cm3/100 g; and, (C) a coupling agent having a moiety reactive with hydroxyl groups contained on the surface of said silica and said clay particles and another moiety interactive with at least one of said diene-based elastomers.