TIRE COMPRISING A TREAD FORMED BY MULTIPLE ELASTOMER BLENDS

摘要

A tire with a radial carcass reinforcement, having a crown reinforcement, itself capped radially by a tread connected to two beads by two sidewalls, the tread having at least two layers of blended elastomeric compounds that are radially superposed and have a voids ratio that is lower in the central part than at the axially outer parts. A first layer of blended elastomeric compounds of the tread is made up of a first blended elastomeric compound forming a part extending at least into the region of the equatorial plane and of at least two axially outer parts formed of a second blended elastomeric compound, the first blended elastomeric compound having a macro dispersion Z-value higher than 65 and a maximum tan(δ) value, denoted tan(δ)max, lower than 0.120, and the complex dynamic shear modulus G* 1% at 100° C. of the second blended elastomeric compound having a value at least 10% higher than that of the complex dynamic shear modulus G* 1% at 100° C. of the first blended elastomeric compound.

主权项

1. A tire with a radial carcass reinforcement, comprising:
a crown reinforcement, a tread radially capping the crown reinforcement and connected to two beads by two sidewalls, the tread comprising at least two layers of blended elastomeric compounds that are radially superposed and have a voids ratio that is lower in a central part than at axially outer parts, wherein a first layer of blended elastomeric compounds of the tread is made up of a first blended elastomeric compound forming a part extending at least into the region of the equatorial plane and of at least two axially outer parts formed of a second blended elastomeric compound, wherein the first blended elastomeric compound has a macro dispersion Z-value higher than 55 and a maximum tan(δ) value, denoted tan(δ)max, lower than 0.120, and wherein the complex dynamic shear modulus G* 1% at 100° C. of the second blended elastomeric compound has a value of at least 10% higher than that of the complex dynamic shear modulus G* 1% at 100° C. of the first blended elastomeric compound.