| 摘要 |
<p>The invention relates to a tire (1), the inner wall (10) of which is provided with a rubber layer (12) that is heat-expandable when the tire is in the crude state, and expanded when the tire is in the vulcanized state. Said rubber layer, which, once expanded, is capable of reducing the running noise of said tire, comprises an elastomer composition containing at least one elastomer such as natural rubber or butyl rubber, a reinforcing filler such as silica and/or carbon black, between 10 and 80 pce of an expansion agent such as an azodicarbonamide compound and between 10 and 50 pce of a hot-melt compound, the melting temperature of which is between 70°C and 150°C, e.g. urea. The combined use of the latter two compounds, at the recommended high levels, enables a great reduction in the expansion rate and thus in the thickness of the foam rubber layer once the tire has been vulcanized, without adversely affecting the noise absorption properties provided by the expansion agent.</p> |
