| 摘要 |
PROBLEM TO BE SOLVED: To provide a more inexpensive rubber composition capable of obtaining high performance, in particular, high breaking characteristics by improvement of a softening agent component as compared with conventional. SOLUTION: In the rubber composition, a mixture of asphalt and a vulcanized rubber powder is formulated relative to a diene based rubber, and an occupying ratio of a natural rubber in the rubber component contained in the vulcanized rubber powder is 50% or higher. The mixture of the asphalt and the vulcanized rubber powder can be prepared by mixing/stirring them at 120°C or higher for 1 hour or longer. As the vulcanized rubber powder, the one obtained from a waste tire can be preferably used. COPYRIGHT: (C)2009,JPO&INPIT
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