| 摘要 |
The invention relates to a tyre for a vehicle, in particular a winter tyre, in an unvulcanised state, the tread of which comprises a heat expandable rubber composition comprising at least one 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, 5 to 25 phr of a sodium or potassium carbonate or hydrogencarbonate and 2 to 20 phr of an acid salt, the total (hydrogen)carbonate and acid salt content being higher than 10 phr, wherein the acid salt is: either an inorganic polyacid acid salt, the acid salt anion being selected from the group consisting of hydrogensulfates, hydrogensulfides, hydrogensulfites, hydrogenphosphates and dihydrogenphosphates; or an organic polyacid acid salt, the acid salt anion being a carboxylic diacid or triacid monocarboxylate or a carboxylic triacid dicarboxylate. The combined use of this carbonate and this acid salt at the recommended rates greatly enhances the grip of the tyre on melting ice. |
