Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Regis Schach

Karine Longchambon

Philippe Labrunie

Miguel Fernandez

Alexandre Tobie

Nathalie Coste

Guillaume Lemasson

A tire comprises an outer strip () having a tread (). The outer strip () has a central part and two axially outer parts and comprises at least two rubber compounds (M, M) making up at least 90% of the volume of the outer strip (). The first compound (M) is radially on the outside of the second compound (M), which makes up at least 60% of the axially outer parts and being disposed in a layer that is substantially continuous from one axially outer part to the other, said layer having a minimum thickness at least equal to 0.3 mm. The compound Mhas a modulus G* that is greater than 1.35 times and less than 3 times that of the compound M. The compound Mhas a dynamic loss at 0° C. greater than 0.5 and the compound Mhas a dynamic loss at 23° C. less than 0.3.

Tire having an improved tread

A tire comprises an outer strip () having a tread (). The outer strip () has a central part and two axially outer parts and comprises at least two rubber compounds (M, M) making up at least 90% of the volume of the outer strip (). The first compound (M) is radially outside of the second compound (M), which makes up at least 60% of the axially outer parts and being disposed in a layer that is substantially continuous from one axially outer part to the other, said layer having a minimum thickness at least equal to 0.3 mm. The compound Mhas a modulus G* that is greater than 1.35 times and less than 3 times that of the compound M. The compound Mhas a dynamic loss at 0° C. greater than 0.5 and the compound Mhas a dynamic loss at 23° C. less than 0.3.

A tire tread that comprises a rubber composition based on an elastomer matrix that comprises more than 50% by weight of at least one butyl rubber, on a reinforcing filler and on a plasticizing system that comprises at least one polybutene oil having a glass transition temperature below &#x2212;75&#xb0; C. A tire comprising such a tread has a good compromise between the wet grip performance and the rolling resistance performance.

Growing community of inventors

Clermont-Ferrand, France

Regis Schach