Tire rubber composition based on a reinforcing aluminosilicate

A process for preparing a rubber composition usable for the manufacture of tires, said composition comprising at least (i) one diene elastomer, at least (ii) one reinforcing inorganic filler, and (iii) a coupling agent providing a bond between the inorganic filler and the elastomer, said inorganic filler comprising a synthetic aluminosilicate of the formula:

• MxSiAlyOa(OH)b, (H2O)c (I)
• where:
• M is a cation selected from the group consisting 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;
• (c) an ultrasound disagglomeration rate (α) greater than 5×10−4 μm−1/min, said process comprising kneading said composition thermomechanically, in one or more stages, until a maximum temperature of between 110° C. and 190° C. is reached.

A method of reinforcing a diene rubber composition, which comprises adding thereto a synthetic aluminosilicate of the formula:

• MxSiAlyOa(OH)b, (H2O)c (I)
• where:
• M is a cation selected from the group consisting 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;
• (c) an ultrasound disagglomeration rate (α) greater than 5×10−4 μm−1/min.