| 摘要 |
PROBLEM TO BE SOLVED: To obtain a rubber composition for a tire having an increased wet-grip properties without increasing rolling resistance by allowing a diene-based rubber to include a specific amount of a specified polymer resin. SOLUTION: This rubber composition for a tire is obtained by formulating (A) 100 pts.wt. diene-based rubber (e.g. a styrene-butadiene copolymer rubber) with (B) 3-60 pts.wt. polymer resin having 5-100 deg.C glass transition temperature and consisting essentially of an aromatic vinyl compound as a softening agent, and (C) optionally 30-110 pts.wt. carbon black, sulfur, a vulcanization accelerator, an antioxidant, a filter, a plasticizer, etc. The component B is, for example, a homopolymer of an aromatic vinyl compound (e.g.α-methylstyrene), a copolymer of the compounds or the compounds and other comonomer (e.g. isoprene) or a blend of a resin thereof with a copolymer resin including 5C or 9C fraction obtained by thermal cracking of a naphtha.
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