Compagnie Generale Des Etablissements Michelin

Fabien Hellot

Olivier Muhlhoff

Benoit De Gaudemaris

Frédéric Bourgeois

Pierre Lesage

Christophe Chouvel

Alain Hut

Benoit Durand-Gasselin

Julien Chatard

François Dimier

Marie-Laure Francois

Sylvain Mayer

David Gonzalez

Florian Dulong

A tire for a vehicle comprises a tread (), of which the central part of the tread () comprises at least two rubber compounds (), making up at least 90% of its volume. The first compound () is radially on the outside of the second compound () and makes up at least 40% and at most 60% of the volume of the central part. The second rubber compound () has a Shore hardness DS2 at least equal to 5 plus the Shore hardness DS1 of the first compound () and dynamic losses at a temperature of 0° C. and 23° C. that are at least equal to those of the first rubber compound (). The axially outer parts of the tread are made up of a third compound () capable of touching the ground, having a stiffness and a hysteresis that are lower than those of the first compound.

Pneumatic tire with improved tread

Passenger vehicle tire, the tread having edge parts (), provided with a plurality of transversely or obliquely oriented cuts () having a width at most equal to 2 mm and a depth at least equal to 75% of the thickness of the tread that is intended to be worn away, more than half of the cuts () comprising a protuberance that locally reduces the width of the cut () to a width at least equal to 0.2 mm and at most equal to 0.5 mm. The tread material which comes into contact with the road surface in the new state has a Shore A hardness at least equal to 48 and at most equal to 57, a loss at 60&#xb0; C. at least equal to 12% and at most equal to 20%, a glass transition temperature Tg at least equal to &#x2212;20&#xb0; C. and at most equal to &#x2212;10&#xb0; C.

Tire with improved performances having cuts with a protuberance that locally reduce a width of a cut in the tread

A rubber composition is based on at least one diene elastomer, a reinforcing filler, a crosslinking system and a hydrocarbon-based resin. The hydrocarbon-based resin has a number-average molecular weight (Mn) of between 700 and 1000 g/mol, an average molecular weight Mz of greater than 6000 g/mol and a polydispersity index (PI) of greater than 2.4.

Rubber composition comprising a specific hydrocarbonated resin

A rubber composition is based on at least one diene elastomer with a glass transition temperature (Tg) of less than &#x2212;40&#xb0; C., one reinforcing filler at a content from 60 to 110 parts by weight per hundred parts by weight of elastomer (phr), one vulcanization system and one combination of plasticizers, the said combination of plasticizers comprising more than 10 phr of at least one hydrocarbon resin with a glass transition temperature (Tg) of between &#x2212;40&#xb0; C. and 20&#xb0; C. and at least one supplementary plasticizer selected from plasticizing oils, hydrocarbon resins with a Tg of greater than 20&#xb0; C. and their mixtures, the total content of plasticizer being within a range extending from 25 to 65 phr, the contents of reinforcing filler and of plasticizer being such that the ratio of the total content of filler to the total content of plasticizer is within a range extending from 1.8 to 2.5.

Rubber composition including a hydrocarbon resin with a low glass transition temperature

Growing community of inventors

Clermont-Ferrand, France

Fabien Hellot