Patent ID: 9701161
Date: 2017-07-11
CPC Classifications: B60C

Claim:
1. A tire with a radial carcass reinforcement, comprising: a crown reinforcement, a tread radially capping the crown reinforcement, 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 the central part than at the 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 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, wherein the first blended compound and the second blended compound have a maximum tan(δ) value, denoted tan(δ)max, at 100° C. of lower than 0.110, wherein the complex dynamic shear modulus G* 1% at 100° C. in MPa of the second blended elastomeric compound has a value at least 10% higher than that of the complex dynamic shear modulus G* 1% at 100° C. in MPa of the first blended elastomeric compound, wherein a second layer of the tread, radially on the outside of the said first layer, is made up of a third blended elastomeric compound of which the complex dynamic shear modulus G* 1% at 100° C. in MPa has a value at least 10% higher than that of the complex dynamic shear modulus G* 1% at 100° C. in MPa of the first blended elastomeric compound, and wherein the elongation at break of the third blended elastomeric compound in a tearability test at 100° C. has a value at least 10% higher than those of the elongations at break of the first and second blended elastomeric compounds in a tearability test at 100° C.