RUBBER COMPOSITION THAT UNDERSTATES AT LEAST ONE SILICA AS INORGANIC REINFORCEMENT LOAD

摘要

the invention relates to a rubber composition produced from at least one elastomer, an inorganic reinforcement material, a coupling agent for coupling the elastomer to the inorganic reinforcement material and a crosslinking system; said inorganic reinforcement filler comprising at least one silica that has: - a specific surface area of ctab sctab within a range of 40 to 300 m / g; - a difference between the specific surface area of bet sbet and the specific surface area of ctab sctab greater than or equal to 35 m2 / g; - a content of aluminum wal in the range of 0.5 to 7.0% by weight, based on the weight of silica s; - a ld aggregate size distribution amplitude, measured by centrifugal sedimentation, greater than or equal to 1.5; and - a d50 mean aggregate diameter, measured by centrifugal sedimentation, so that, for a given value of specific surface area of ctab sctab and a given aluminum content wal, an amount a is defined by the following equation (i): a = [d50] + 0.782 x [sctab] - 8.524x [wal] (i) where: [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 in relation to the weight of silica s; and said quantity a satisfies the relationship (ii): a = 253 (ii). the compositions of the invention can be used in tires or semi-finished articles for tires.