Tire comprising a tread made up of several elastomeric compounds
AssigneesCompagnie Generale Des Etablissements Michelin, Michelin Recherche et Technique S.A.
InventorsPhilippe Gervais, Alain Durand
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Abstract
A tire with radial carcass reinforcement, comprising a crown reinforcement, itself capped radially by a tread connected to two beads by two sidewalls, the said tread comprising at least two radially superposed layers of polymer compound, a first layer of filled elastomeric compound, constituting the radially outer part of the tread, has a macrodispersion score Z higher than 80 and a maximum tan(δ) value, denoted tan(δ)max, lower than 0.130 and a second layer of elastomeric compound radially on the inside of the said first layer of elastomeric compound has an elongation at break at 60° C. that is higher than 600%.
Claims18
A tire with radial carcass reinforcement, comprising:
- a crown reinforcement including a radially outermost working layer extending between a pair of ends,
- a tread radially capping the crown reinforcement, connected to two beads by two sidewalls, and comprising at least two radially superposed layers of polymer compound, comprising a first layer of filled elastomeric compound, constituting the radially outer part of the tread, has a macrodispersion score Z higher than 80 and a maximum tan(δ) value, denoted tan(δ)max, lower than 0.130, and a second layer of elastomeric compound radially on the inside of and in abutting relationship with the said first layer of elastomeric compound having an elongation at break at 60° C. that is higher than 600%, and wherein the second layer of elastomeric compound viewed in a meridian cross section extends continuously across the tread.
Dependencies are inferred from the claim text.