| abstract |
The present invention relates to a process for retreading a radial tyre ( 1 ) for a motor vehicle, comprising:n a crown ( 2 ) comprising a tread ( 3 ) provided with at least a radially outer part ( 3 a ) 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 ( 3 a ) 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 ( 3 a ) of the tread, this underlayer being itself positioned circumferentially between the radially outer part ( 3 a ) of the tread ( 3 ) and the crown reinforcement ( 7 ); the said underlayer comprising 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); the said process comprising a stage consisting in removing the said tread from the structure of the tyre by softening the said underlayer. |