| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain tire excellent in abrasion resistance, durability on heat build-up and antiwandering property, by composing it from a tread section consisting of a cap layer and a base payer with a double-layer structure made of a rubber constituent composed of a natural rubber and a specific amt. of a diene rubber which comprises a carbon black with a particular level of specific surface area and the like. SOLUTION: This tire is composed of a tread section consisting of a cap layer made of 100 pts.wt. of a rubber constituent composed of 30-90 pts.wt. of a natural rubber and 70-10 pts.wt. of a SBR, which comprises 30-70 pts.wt. of a carbon black with a specific surface area (nitrogen adsorption) of >=70 m<2> /g as well as a base rubber layer having an inner layer and an innermost layer made of 100 pts.wt. of a rubber constituent composed of 100-70 pts.wt. of a natural rubber and 0-30 pts.wt. of a diene rubber, which comprises 25-60 pts.wt. of a carbon black with a specific surface area of 70-160 m<2> /g, 2.5-30 pts.wt. of a silica and a silane coupling agent in an amt. of 5-20 wt.% based on the amt. of the silica in the former case and 20-50 pts.wt. of a carbon black with a specific surface area of<=90 m<2> /g in the latter case, wherein tanδ's are in the order of the cap layer > the vase inner layer > the base innermost layer.</p> |
