Tyre having a tread provided with cavities containing a specific filler material

Abstract

A tire having a tread, said tread being provided with a plurality of cavities, at least some of said cavities having a filling composition based on at least: a diene elastomer; more than 50 phr of filler (denoted filler A), the particles of which are nanoparticles having an average size (by weight) of less than 500 nm; and more than 70 phr of filler (denoted filler B), the particles of which are microparticles having a median particle size (by weight) of greater than 1 μm. This filling composition is sufficiently cohesive to ensure excellent mechanical behaviour of the cavities. It also has the capability of progressively wearing during running, without cracking, more quickly than the constituent composition of the tread itself.

Description

technical field [0001] The present invention relates to tires, treads for these tires and rubber compositions useful for the manufacture of these treads. [0002] The invention relates more particularly to combinations which may be used to fill cavities present on the surface of the tread in an unworn state, or which may be added to the body of said tread and intended to be level with its surface in a subsequent stage after the first run material (hereinafter also referred to as "filling material"). Background technique [0003] As is known, tires, whether intended to be mounted on passenger cars or trucks, are provided with a tread pattern to obtain satisfactory grip, especially on surfaces that become slippery due to the presence of liquids . The tread pattern comprises, inter alia, tread pattern elements or blocks formed by molding through the thickness of the tread, which are defined by a plurality of principal longitudinal, transverse, or even oblique ribs or grooves,...

AI Technical Summary

Problems solved by technology

[0007] However, these used filler materials may also have disadvantages

Depending on the specific operating conditions of the tire, there is a tendency for the material to crack during operation, causing the material to partially lose its cohesion (the cavities have a tendency to become empty momentarily), which ultimately detracts from the above-mentioned intended difference (progressive) wear and tear

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