Patent ID: 7250465

Claim:
A tire having at least one component of a rubber composition comprised of at least one conjugated diene-based elastomer, to the exclusion of butyl type polymers, based upon parts by weight per 100 parts by weight rubber (phr): (A) 100 parts by weight (phr) of at least one conjugated diene-based elastomer comprised of: (1) about 55 to about 100 phr of cis 1,4-polyisoprene rubber and (2) from zero to 45 phr of at least one additional conjugated diene-based rubber selected from polymers of 1,3-butadiene, copolymers of isoprene and 1,3-butadiene and copolymers of styrene and at least one of isoprene and 1,3-butadiene; (B) about 1 to about 30 phr of a liquid polyalkylene copolymer selected from: (1) a first ethylene/butylene copolymer having at least one terminal primary hydroxyl group on one end of said copolymer and a partially hydrogenated polyisoprene block which contains olefinic double bonds therein on the opposite end of said copolymer from said terminal hydroxyl group, or (2) a second ethylene/butylene copolymer having at least one terminal primary hydroxyl group on one end of said copolymer and an epoxidized polyisoprene block on the opposite end of said copolymer from said terminal hydroxyl group, (C) about 25 to about 100 phr of reinforcing filler as: (1) rubber reinforcing carbon black, or (2) about 0 to about 95 phr of rubber reinforcing carbon black and from about 5 to about 100 phr of synthetic amorphous precipitated silica aggregates, and (D) optionally a coupling agent having a moiety reactive with hydroxyl groups of said ethylene/butylene copolymer and hydroxyl groups contained on the surface of said precipitated silica, if said precipitated silica aggregates are used, and another moiety interactive with said conjugated diene-based elastomer(s); wherein said butyl-type rubbers are: (E) copolymers of isobutylene and conjugated diene, (B) halogenated copolymers of isobutylene and conjugated diene, and (C) brominated copolymers of isobutylene and para methylstyrene.