Tyre, the tread of which comprises a heat-expandable rubber composition reducing noise during travel

摘要

A vehicle tire includes a tread formed of a heat-expandable rubber composition when in an unvulcanized state. The composition includes: from 50 to 100 phr of a copolymer based on styrene and butadiene; optionally from 0 to 50 phr of another diene elastomer, such as a polybutadiene or natural rubber; more than 50 phr of a reinforcing filler, such as silica and/or carbon black; between 5 and 25 phr of a blowing agent, such as an azodicarbonamide compound; and between 5 and 25 phr of a heat-fusible compound having a melting point between 70° C. and 150° C., such as urea or a heat-fusible urea derivative. A total content of the blowing agent and the heat-fusible compound is greater than 15 phr. Use of the composition enables, after the tire is vulcanized, a significant reduction in noise emitted by the tire during running.

主权项

1. A tire comprising a tread having a radially outermost part which comes in direct contact with a surface of a road,
wherein at least the radially outermost part of the tread which comes in direct contact with the surface of the road, in an unvulcanized state, comprises a heat-expandable rubber composition, wherein the heat-expandable rubber composition includes:
50 to 100 phr of a copolymer based on styrene and butadiene;0 to 50 phr of another diene elastomer;a reinforcing filler comprising from 70 to 120 phr of a silica and from 1 to 10 phr of carbon black;between 5 and 25 phr of a blowing agent; andbetween 5 and 25 phr of a heat-fusible compound having a melting point between 70° C. and 150° C., wherein a total content of the blowing agent and the heat-fusible compound is greater than 15 phr, and wherein the heat-fusible compound is urea or a heat-fusible urea derivative.