Patent ID: 7367369

Claim:
An aircraft tire having a tread of a rubber composition comprised of, based upon parts by weight per 100 parts by weight rubber (phr): (A) diene-based elastomers consisting essentially of (1) about 55 to about 95 phr of cis 1,4-polybutadiene elastomer having a microstructure comprised of about 96 to about 99 percent cis 1,4-isomeric units, about 0.1 to about 1 percent trans 1,4-isomeric units and from about 1 to about 3 percent vinyl 1,2-isomeric units; a number average molecular weight (Mn) in a range of from about 75,000 to about 150,000 and a heterogeneity index (Mw/Mn) in a range of from about 3/1 to about 5/1; (2) about 5 to about 45 phr of cis 1,4 polyisoprene natural rubber; (B) about 20 to about 120 phr of reinforcing filler as a combination of: (1) about 10 to about 60 phr of particulate precipitated silica, and (2) about 10 to about 60 phr of rubber reinforcing carbon black having a DBP (dibutyl phthalate) value of about 124 cc/100 g and an Iodine value of about 90 g/kg and (C) coupling agent comprised of a bis(3-triethoxysilylpropyl) polysulfide having an average of from about 2 to about 2.6 connecting sulfur atoms in its polysulfidic bridge.