| 摘要 |
<p>A pneumatic tire has a tread comprising a rubber composition produced by blending a rubber component with a styrene based thermoplastic elastomer, the rubber component being composed mainly of a diene based rubber, and the elastomer being so preliminary internally crosslinked that tensile stress at 100% elongation is increased to 10 to 1,000% of that of the styrene based thermoplastic elastomer not internally crosslinked. A pneumatic tire is also disclosed, having a tread portion comprising a rubber composition blended with a vinyl aromatic hydrocarbon thermoplastic elastomer in an amount of 5-80 parts by weight relative to 100 parts by weight of the rubber component, the vinyl aromatic hydrocarbon thermoplastic elastomer satisfying the following requirements: (1) the elastomer is a vinyl aromatic hydrocarbon-conjugated diene based block type thermoplastic elastomer; (2) the elastomer has a weight ratio between a vinyl aromatic hydrocarbon and a conjugated diene as constituent monomer units thereof of 40/60 to 95/5; (3) the content of the vinyl aromatic hydrocarbon in vinyl aromatic hydrocarbon based segments in the elastomer is not less than 50% by weight; and (4) the weight average molecular weight of the elastomer is not less than 1 x 10<5>.</p> |
