US Patent 7256233 Tire rubber composition based on a reinforcing aluminosilicate

A rubber composition usable for the manufacture of tires, based on at least one diene elastomer, one reinforcing inorganic filler and a coupling agent providing the bond between the inorganic filler and the elastomer. The inorganic filler comprises a synthetic aluminosilicate of the formula:MxSiAlyOa(OH)b, (H2O)c  (I)in which:M is a cation selected from of K+, Na+, Ca++ and mixtures of these cations;x>0; y>0; a≧0; b≧0, c≧0 and a+b>0,and having the following characteristics:(a) a BET specific surface area of between 20 and 300 m2/g;(b) an average particle size by mass (dw) of between 20 and 400 nm; and(c) an ultrasound disagglomeration rate (α) greater than 5×10−4 μm−1/min.