The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 07, 2021
Filed:
May. 03, 2018
Compagnie Generale Des Etablissements Michelin, Clermont-Ferrand, FR;
Angélique Pawlak, Clermont-Ferrand, FR;
Emmanuelle Allain Najman, L'Hay les Roses, FR;
Stéphane Badaire, Clermont-Ferrand, FR;
Caroline Fayolle, Lyons, FR;
Pascaline Garbey, Saint Didier au Mont d'Or, FR;
Laurent Guy, Rillieux-la-Pape, FR;
Sylvaine Neveu, Paris, FR;
Fabien Stocklouser, Lyons, FR;
COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand, FR;
Abstract
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×[S]−8.524×[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≥253 (II). The compositions of the invention are of use in tyres or semi-finished articles for tyres.