| 摘要 |
PROBLEM TO BE SOLVED: To reduce a road noise without causing reduction of operation stability. SOLUTION: The tread rubber composition contains 100 pts.wt. of a rubber composition comprising one kind or more of a diene based rubber, 30-90 pts.wt. of a reinforcing agent, 0.5-5.0 pts.wt. of a vulcanization promotor, 1.0-3.5 pts.wt. of sulfur and 0.5-5.0 pts.wt. of zinc oxide. The rubber composition has a glass transition temperature Tg1 of -7°C or higher and a loss coefficient (tanδ) at 0°C of 0.70 or higher. Further, the rubber component contains 60 wt.% or more of a high Tg rubber having a glass transition temperature Tg2 of 0°C or higher in the whole rubber component. COPYRIGHT: (C)2008,JPO&INPIT
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