Heavy goods vehicle tire comprising a tread based on a modified polyisoprene, process for preparing same

A process for manufacturing a heavy-duty vehicle tire comprising preparing the rubber composition of the tread, which comprises:

• modifying synthetic polyisoprene by grafting a modifier comprising at least one group Q, and at least one group A, which are joined to one another by at least one “spacer” group Sp, in which:
• Q comprises a nitrile oxide, nitrone or nitrile imine function,
• A comprises an associative group comprising at least one nitrogen atom,
• Sp is a C1 to C24 group forming a bond between Q and A,
• incorporating between 30 and 150 phr of a reinforcing filler consisting of silica SiO2 and less than 20 phr of carbon black into the synthetic polyisoprene thus grafted with the modifier, by thermomechanically kneading everything, in one or more steps, until a maximum temperature of between 110° C. and 200° C. is reached,
• cooling the combined mixture to a temperature of less than 100° C.,
• then incorporating a chemical crosslinker,
• kneading everything up to a maximum temperature of less than 120° C.,
• extruding the resulting rubber composition in order to obtain a profiled element for a tread,
• assembling the various semi-finished elements that make up the tire, including the tread formed above.

A process for manufacturing a heavy-duty vehicle tire comprising preparing the rubber composition of the tread, which comprises:

• incorporating into polyisoprene, a modifier comprising at least one group Q, and at least one group A, which are joined to one another by at least one “spacer” group Sp, in which:
• Q comprises a nitrile oxide, nitrone or nitrile imine function,
• A comprises an associative group comprising at least one nitrogen atom,
• Sp is a C1 to C24 group forming a bond between Q and A,
• subsequently incorporating between 30 and 150 phr of a reinforcing filler consisting of silica SiO2 and less than 20 phr of carbon black, and also all the base constituents of the composition, with the exception of a chemical crosslinking system, by thermomechanically kneading everything, in one or more steps, until a maximum temperature of between 110° C. and 200° C. is reached,
• cooling the combined mixture to a temperature of less than 100° C.,
• then incorporating a chemical crosslinking system,
• kneading everything up to a maximum temperature of less than 120° C.,
• extruding the resulting rubber composition in order to form the tread,
• assembling the various semi-finished elements that make up the tire, including the tread formed above.