| 摘要 |
<p>The present invention relates to a radial tyre (1) for a motor vehicle, comprising a crown (2) comprising a tread (3) provided with at least a radially outer part (3a) intended to come into contact with the road; two non-stretchable 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); a crown reinforcement or belt (7) positioned circumferentially between the radially outer part (3a) of the tread (3) and the carcass reinforcement (6); a radially inner elastomer layer (8), referred to as“underlayer”, having a formulation different from the formulation of the radially outer part (3a) of the tread, this underlayer being itself positioned circumferentially between the radially outer part (3a) of the tread (3) and the carcass reinforcement (6), characterized in that the said underlayer comprises at least one thermoplastic elastomer, the said thermoplastic elastomer being a block copolymer comprising at least one elastomer block and at least one thermoplastic block, and the total content of thermoplastic elastomer being within a range varying from 65 to 100 phr (parts by weight per hundred parts of elastomer), and characterized in that the said underlayer exhibits a ratio of elastic modulus at 200° C. and at 60° C. which is different from that of the adjacent layers, so that the following equation is adhered to with each of the adjacent layers: G A′ ( 200 ° C . ) G A′ ( 60 ° C . ) G B′ ( 200 ° C . ) G B′ ( 60 ° C . )≤0.6</p> |
