| 摘要 |
PURPOSE:To obtain a pneumatic tire having improved resistance to abrasion and local abrasion, by using a tread made of a composition produced by adding a small amount of a resin composed mainly of methyl-1,4-hexadiene and propylene to a rubber composed mainly of isoprene chain. CONSTITUTION:The tread of the objective pneumatic tire is made of a vulcanizable rubber composition consisting of (A) >=50pts.wt. of a rubber containing >=70wt% isoprene, (B) 1-10pts. of a resin composed mainly of methyl-1,4-hexadiene and propylene and/or ethylene, expressed by formula (R is H or methyl; >=30%, preferably >=60% of R is methyl; m is 5-100, preferably 20-40) and having a crystal melting point of the polypropylene segment of >=130 deg.C and a number-average molecular weight of 8,000-200,000 and (C) >=8pts. (based on 1pt. of the component B) of carbon black having an iodine absorption of >=85mg/g and DBP oil-absorption of >=100ml/100g. |
