Compagnie Generale Des Etablissements Michelin

Florent Vaultier

Charlotte Dire

Benoit De Gaudemaris

Margarita Dorato

Jean-Marc Marechal

Jean Marc Marechal

Rokhiyatou Said-Diatta

Marie-Hélène Dessendier

Gael Courbes

Gaël Courbes

A process for preparing a functionalized polybutadiene is provided. The process comprises the following steps: The total molar amount of aluminium in the polymerization medium is such that the (aluminium/rare earth salt) molar ratio has a value between 1 and 5 and the polymerization is carried out at a temperature between 40&#xb0; C. and 90&#xb0; C. A functionalized polybutadiene that can be obtained by the process, and a rubber composition containing the functionalized polybutadiene is also provided.

Functionalised polybutadiene synthesis process

A modified diene elastomer having a good flow resistance, and imparting to a rubber composition containing the same a good compromise of hysteresis and abrasion properties and a satisfactory processing with a view to a tire application is provided. This modified elastomer comprises: a) at least 70% by weight of a linear diene elastomer predominantly functionalized in the middle of the chain by an alkoxysilane group, optionally partly or completely hydrolyzed to silanol, the alkoxysilane group optionally bearing another function capable of interacting with a reinforcing filler, the silicon atom of the alkoxysilane group lying in the main chain of the diene elastomer; b) more than 0 and up to 30% by weight of a star-branched diene elastomer, the Mooney viscosity of said modified diene elastomer varying from 50 to 80 and the glass transition temperature (Tg) thereof varying from &#x2212;100&#xb0; C. to &#x2212;80&#xb0; C.

Diene elastomer having a function in the middle of the chain and rubber composition containing the same

A modified diene elastomer is provided. The elastomer comprises:

Modified diene elastomer with reduced PDI and composition containing same

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Clermont-Ferrand, France

Florent Vaultier