Patent ID: 8859650

Claim:
A rubber composition for tires which comprises at least one rubber component selected from natural rubber and synthetic rubbers and, based on 100 parts by mass of the rubber component, 45 to 150 parts by mass of carbon black, 5 to 20 parts by mass of (A) a terpene phenol resin and 1 to 150 parts by mass of (B) a softener comprising a process oil which comprises polycyclic aromatic compounds (PCA) in an amount such that a content of extracts with dimethyl sulfoxide (DMSO) in accordance with a method of IP346 is controlled to a value smaller than 3%, wherein a softening point of the terpene phenol resin of Component (A) is in a range of 100 to 150° C. and an OH-value (KOH mg/g) of the terpene phenol resin of Component (A) is 40 to 150, and wherein the softener of Component (B) comprises hydrogenated naphthenic oil, and asphalt having a kinematic viscosity of 300 mm 2 /sec or smaller at 120° C. and comprising 5% by mass or smaller of asphaltene, and a ratio of amounts by mass of the hydrogenated naphthenic oil to the asphalt is in a range of 95/5 to 5/95.