Tire comprising a tread
AssigneeCompagnie Generale Des Etablissements Michelin
InventorTomoya Sakurada
Life of this patent
Estimating the term…
Abstract
A tire having a tread comprising at least three radially superposed portions which comprise a radially external portion being made of a first rubber composition, a radially intermediate portion being made of a second rubber composition and a radially internal portion being made of a third rubber composition; wherein each of the rubber compositions is based on at least an elastomer matrix, a reinforcing filler and a crosslinking system based on sulphur; wherein the amount in phr of sulphur in the first rubber composition is lower than that in the second rubber composition, and wherein the amount in phr of sulphur in the second rubber composition is higher than that in the third rubber composition.
Claims20
A snow tire having a tread comprising at least three radially superposed portions which comprise a radially external portion being made of a first rubber composition, a radially intermediate portion being made of a second rubber composition, and a radially internal portion being made of a third rubber composition,
- wherein each of the rubber compositions is based on at least:
- an elastomer matrix;
- a reinforcing filler;
- and
- a crosslinking system based on sulfur,
- wherein an amount in phr of sulfur in the first rubber composition is lower than an amount in phr of sulfur in the second rubber composition,
- wherein the amount in phr of sulfur in the second rubber composition is higher than an amount in phr of sulfur in the third rubber composition,
- wherein the elastomer matrix comprises at least a diene elastomer selected from the group consisting of polybutadienes, natural rubber, synthetic polyisoprenes, butadiene copolymers, isoprene copolymers, and mixtures thereof, and
- wherein in the second rubber composition and in the third rubber composition, the elastomer matrix comprises more than 50 phr and up to 100 phr of a first diene elastomer selected from the group consisting of natural rubber (NR), synthetic polyisoprenes (IR) and the mixtures thereof.
A snow tire having a tread comprising at least three radially superposed portions which comprise a radially external portion being made of a first rubber composition, a radially intermediate portion being made of a second rubber composition, and a radially internal portion being made of a third rubber composition,
- wherein each of the rubber compositions is based on at least:
- an elastomer matrix;
- a reinforcing filler;
- and
- a crosslinking system based on sulfur,
- wherein an amount in phr of sulfur in the first rubber composition is lower than an amount in phr of sulfur in the second rubber composition,
- wherein the amount in phr of sulfur in the second rubber composition is higher than an amount in phr of sulfur in the third rubber composition, and
- wherein the reinforcing filler in each of the rubber compositions comprises more than 50% by weight of a reinforcing inorganic filler.
Dependencies are inferred from the claim text.