TIRE, THE TREAD OF WHICH COMPRISES A HEAT-EXPANDABLE RUBBER COMPOSITION REDUCING NOISE DURING TRAVEL

摘要

The invention relates to a vehicle tire, the tread of which, in the non-vulcanized state, comprises a heat-expandable rubber composition comprising at least: 50 to 100 pce of a styrene and butadiene copolymer; optionally, 0 to 50 pce of another diene elastomer, such as a polybutadiene or natural rubber; more than 50 pce of a reinforcing filler, such as silica and/or carbon black; 5 to 25 pce of a blowing agent, such as an azodicarbonamide compound; and 5 to 25 pce of a hot-melt compound, the melting point of which is 70° to 150°C, e.g. urea or a hot-melt urea derivative, the total content of the blowing agent and hot-melt compound being more than 15 pce. The use of such a compound in the vulcanized state makes it possible to substantially reduce the noise made by the tire while the vehicle is traveling.