TIRE HAVING A CROWN AREA PROVIDED WITH A SUBLAYER COMPRISING A THERMOPLASTIC ELASTOMER

摘要

The invention relates to a radial-ply tire (1) for a motor vehicle which comprises: a tread (3) mounted on a crown (2), wherein said tread is provided with at least one radially external elastomer layer (3a) designed to come into contact with the road when the tire is rolling; two inextensible beads (4), two sidewalls (5) connecting the beads (4) to the tread (3), a carcass reinforcement (6) running within the two sidewalls (5) and anchored to the beads (4); the crown (2) being reinforced with a crown reinforcement or belt (7) arranged circumferentially between the carcass reinforcement (6) and the tread (3); a radially internal elastomer layer (3b) referred to as a sublayer having a formulation different from that of the radially external elastomer layer (3a), said sublayer being arranged between the radially external layer (3a) and the belt (7), characterized in that said sublayer comprises a rubber composition comprising at least one diene elastomer, a reinforcing filler and a thermoplastic styrene copolymer (called a "TPS elastomer"). The use of the TPS copolymer allows an increase in stiffness of the sublayer and hence an improvement in the road handling of the tires, while retaining a good level of hysteresis and therefore of rolling resistance.