Compagnie Generale Des Etablissements Michelin

Stéphane Badaire

Laurent Guy

Sylvaine Neveu

José-Carlos Araujo Da Silva

Conny Vogler

Garance Lopitaux

Werner Niedermeier

Emmanuelle Allain Najman

Pascaline Garbey

Caroline Fayolle

Perrine Vallat

Maxime Pras

Angélique Pawlak

Fabien Stocklouser

Simon Duriez

A rubber composition is based on at least one elastomer, a reinforcing inorganic filler, an agent for coupling the elastomer to the reinforcing inorganic filler, and a crosslinking system. The reinforcing inorganic filler comprises at least one silica S having: a CTAB specific surface area Swithin a range extending from 40 to 300 m/g; a difference between the BET specific surface area Sand the CTAB specific surface area Sof greater than or equal to 35 m/g; an aluminium content Wwithin a range extending from 0.5 to 7.0% by weight relative to the weight of the silica S; a width of the aggregate size distribution Ld, measured by centrifugal sedimentation, of greater than or equal to 1.5; and a median aggregate diameter d50, measured by centrifugal sedimentation, such that for a given value of CTAB specific surface area Sand a given aluminium content W, a magnitude A is defined by the following equation (I): A=[d50]+0.782&#xd7;[S]&#x2212;8.524&#xd7;[W] (I), in which: [d50] is the numerical value of d50, expressed in nm; [S] is the numerical value of S, expressed in m/g; [W] is the numerical value of W, expressed in % by weight relative to the weight of the silica S; and said magnitude A satisfies the relationship (II): A&#x2265;253 (II). The compositions of the invention are of use in tyres or semi-finished articles for tyres.

Rubber composition comprising at least one silica as inorganic reinforcing filler

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Clermont-Ferrand, France

Stéphane Badaire