| 摘要 |
Vehicle tyre, notably a winter tyre, the tread of which comprises a rubber composition that is heat-expandable in the unvulcanized state and expanded in the vulcanized state; in the unvulcanized state, said composition comprises a diene elastomer such as natural rubber and/or a polybutadiene, more than 50 phr of a reinforcing filler such as silica and/or carbon black, between 5 and 25 phr of a sodium or potassium (hydrogen) carbonate, between 2 and 20 phr of an acid quaternary ammonium salt, the total content of (hydrogen) carbonate and acid salt being greater than 10 phr, preferably greater than 15 phr. The combined use of the last two compounds, at the recommended high contents, makes it possible to greatly improve the grip of the tyre on melting ice. |
