Rubber composition for a tire comprising a coupling agent having a polythiosulfenamide function

Abstract

An elastomeric composition usable for the manufacture of tires, based on at least (i) a diene elastomer, (ii) an inorganic filler as reinforcing filler and (iii), as (inorganic filler/diene elastomer) coupling agent, a polysilylated organosilicon compound which is at least bifunctional and can be grafted onto the elastomer by means of a sulfur group having a polythiosulfenamide function, of formula: ≡Si—A—Sx—NR1R2 ,  (I) in which: A is a divalent bond group, whether straight-chain or branched, which makes it possible to join the polythiosulfenamide group to a first silicon atom of the organosilicon compound; x is an integer or fractional number of from 2 to 4; R1 represents hydrogen, a monovalent hydrocarbon group, or R2; and R2 represents the grouping: —B—Si≡, in which: B is a divalent bond group, whether straight-chain or branched; Si represents a second silicon atom of the organosilicon compound. The invention also concerns tires and tire treads comprising a composition of this type.

Dependencies are inferred from the claim text.