Patent ID: 6932132

Claim:
A pneumatic rubber tire having a sidewall comprised of an outer visually observable surface wherein said outer sidewall surface is of a rubber composition which is exclusive of a high cis 1,4-polybutadiene rubber and contains, based on 100 parts by weight rubber (phr); (A) 100 phr of elastomers consisting essentially of: (1) about 30 to about 50 phr of a high trans 1,4-polybutadiene polymer having a trans 1,4-content in a range of about 60 to about 80 percent, (2) about 40 to about 60phr of a brominated copolymer of isobutylene and para-methylstyrene polymer, and (3) about 2 to about 15 phr of at least one additional conjugated diene-based elastomer selected from the group consisting of at least one of natural and/or synthetic cis 1,4-polyisoprene rubber and styrene/butadiene copolymer rubber, and (B) about 15 to about 70 phr of reinforcing filler as: (1) carbon black, or (2) combination of carbon black and synthetic precipitated silica comprised of at least 5 phr of carbon black, with a coupling agent having a moiety reactive with hydroxyl groups contained on the precipitated silica and another moiety interactive with said trans 1,4-polybutadiene rubber and additional conjugated diene-based elastomer(s).