Compagnie Generale Des Etablissements Michelin

Compagnie Generale Des Etablissments Michelin

Sophie Gander

Anne-Frédérique Salit Salit

Sergey Ivanov

Claire Rannoux

Anne-Lise Thuilliez

Nicolas Seeboth

Etienne Fleury

Gael Roty

Hervé Ferigo

François Jean-Baptiste-Dit-Dominique

Benoît Schnell

Adeline Jasselin

Oleg Ugolnikov

Anne-Frédérique Salit

The rolling resistance of a tire has been improved without degrading industrial performance. The sidewall () consists of two sub-layers. A first sub-layer (FE) of thickness E1 and volume V1 provides the expected protection functions of a sidewall as the outer wall of the tire, and a second sub-layer of the sidewall (FE) of thickness E2 and volume V2 is optimized at low hysteresis to improve rolling resistance. The ratio V1/(V1+V2) of the volumes of the two sub-layers (FE, FE) is less than or equal to 0.3. The elongation at break of the compound of FEis greater than or equal to 200% measured at a temperature of 100° C., and the viscoelastic loss of the compound of FE, Tan(δ)max, is less than or equal to 0.10.

Tire having optimized performance in terms of rolling resistance without impairing the industrial performance

A 1,3-dipolar compound including an epoxide group is provided. The epoxide group is a 3-membered ether ring in which a first member is a carbon atom having an attachment to the dipole of the 1,3-dipolar compound and a second member is a tertiary or quaternary carbon. The use of the 1,3-dipolar compound in the modification of a diene polymer makes it possible to improve the rupture properties of a rubber composition comprising the modified polymer, without the expense of its hysteresis properties, while at the same time improving its implementation.

1,3-dipolar compound comprising an epoxide group

A rubber composition based on at least one diene elastomer, a reinforcing filler and a 1,3-dipolar compound comprising an epoxide group is provided. The epoxide group is a 3-membered ether ring in which a first member is a carbon atom exhibiting a connection to the dipole of the 1,3-dipolar compound and a second member is a tertiary or quaternary carbon. Such a rubber composition exhibits improved properties at break and an improved processing, as well as good hysteresis properties.

Rubber composition

In a 1,3-dipolar compound of formula Q-A-B, Q comprises a dipole containing at least and preferably one nitrogen atom, A, which is preferably divalent, is an atom or a group of atoms connecting Q to B, and B comprises an imidazole ring. An unsaturated polymer modified by grafting the 1,3-dipolar compound is also disclosed.

1,3-dipolar compound bearing an imidazole functional group

A rubber composition is based on at least one diene elastomer, a reinforcing filler and a 1,3-dipolar compound bearing an imidazole functional group. Such a composition exhibits an improved compromise in certain properties such as stiffness in the cured state and hysteresis.

Rubber composition comprising a 1,3-dipolar compound additive bearing an imidazole functional group

A rubber composition comprises a reinforcing filler and a diene elastomer bearing imidazole functional groups along the chain which are randomly distributed along the chain. Such a composition exhibits an improved compromise in certain properties such as stiffness in the cured state and hysteresis.

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Clermont-Ferrand, France

Sophie Gander