| 摘要 |
<p>A radial tire (1) for motor vehicle, comprising: a crown (2) surmounted by a tread (3) provided with at least one radially outer part (3a) intended to come into contact with the road; two inextensible beads (4), two sidewalls (5) connecting the beads (4) to the tread (3), a carcass reinforcement (6) passing into the two sidewalls (5) and anchored in the beads (4); the crown (2) being reinforced by a crown reinforcement or belt (7) placed circumferentially between the carcass reinforcement (6) and the tread (3); a radially inner elastomer layer (3b, 8) known as a“underlayer”, having a formulation different from the formulation of the radially outer elastomer layer (3a), this underlayer being placed between the radially outer layer (3a) of the tread (3) and the belt (7), wherein said underlayer comprises 50 to 100 phr of a copolymer based on stirene and on butadiene, preferably an SBR having in particular a Tg above−40° C., a reinforcing filler and between 10 and 150 phr of a platy filler. This elastomer underlayer has excellent water-barrier properties, giving the tire and its belt improved protection against the risks of water penetration through the tread.</p> |
