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|1. (WO2018203002) RUBBER COMPOSITION COMPRISING AT LEAST ONE SILICA AS INORGANIC REINFORCING FILLER|
|Applicants:||COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN
ALLAIN NAJMAN, Emmanuelle
|Title:||RUBBER COMPOSITION COMPRISING AT LEAST ONE SILICA AS INORGANIC REINFORCING FILLER|
The invention concerns a rubber composition made from at least one elastomer, an inorganic reinforcing filler, a coupling agent for coupling the elastomer with the inorganic reinforcing filler, and a crosslinking system; said inorganic reinforcing filler comprising at least one silica S having: - a CTAB specific surface area SCTAB within a range from 40 to 300 m2/g; - a difference between the BET specific surface area SBET and the CTAB specific surface area SCTAB greater than or equal to 35 m2/g; - an aluminium content WAl within a range from 0.5 to 7.0% by weight relative to the weight of the silica S; - an aggregate size distribution width Ld, measured by centrifugal sedimentation, greater than or equal to 1.5; and - an average aggregate diameter d50, measured by centrifugal sedimentation, such that, for a given CTAB specific surface area SCTAB value and a given aluminium content WAl, a quantity A is defined by the following equation (I): A = [d50] + 0.782 × [SCTAB] - 8.524×[WAl] (I) in which: [d50] is the numerical value of d50 expressed in nm; [SCTAB] is the numerical value of SCTAB expressed as m2/g; [WAl] is the numerical value of WAl expressed as % by weight relative to the weight of the silica S; and said quantity A satisfies the relationship (II): A ≥ 253 (II). The compositions of the invention can be used in tyres or semi-finished articles for tyres.