Patent ID: 6723777
Filing Date: 2004-04-20
Classification: B60C,C08K,Y10S

Abstract:
A skid steering, fixed axle, assembly selected from a tire/wheel assembly and a drive wheel/vehicular track assembly wherein said tire and track has a tread of rubber composition which comprises, based upon 100 parts by weight rubber (phr),(A) 100 parts by weight of at least one conjugated diene-based elastomer, (B) about 35 to about 100 phr of particulate filler comprised of aggregate of synthetic amorphous silica and from zero to about 7 phr of carbon black, (C) about 2 to about 5 phr of a phenolic-based antidegradant to the exclusion of an amine-containing antidegradant, (D) about five to about 15 phr of a paraffinic rubber processing oil which contains less than about 14 weight percent aromatic compound(s) to the exclusion of rubber processing oil containing greater than 15 weight percent of aromatic compounds and (E) coupling agent having a moiety reactive with hydroxyl groups contained on the surface of the said amorphous silica and another moiety interactive with at least one of said diene-based elastomers, wherein said coupling agents are comprised of (1) bis(3-triethoxysilylpropyl)polysulfide having an average of from 2 to 2.6 connecting sulfur atoms in its polysulfidic bridge, and (2) bis(3-triethoxysilylpropyl) polysulfide having an average of from 3.5 to 4 connecting sulfur atoms in its polysulfidic bridge.