Patent ID: 11111360

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 SCTAB within a range extending from 40 to 300 m2/g; a difference between the BET specific surface area SBET and the CTAB specific surface area SCTAB of greater than or equal to 35 m2/g; an aluminium content WAl within 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 SCTAB and a given aluminium content WAl, a magnitude 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 in m2/g; [WAl] is the numerical value of WAl, 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.