RUBBER COMPOSITION FOR TYRE COMPRISING A COUPLING AGENT WITH POLYTHIOSUPLHENAMIDE FUNCTION

摘要

The invention concerns an elastomeric composition for making tyres, based on at least (i) a diene elastomer, (ii) an inorganic filler as reinforcing filler and (iii), as coupling agent (inorganic filler/diene elastomer), an organosilicon compound at least bifunctional capable of being grafted on the elastomer by means of a sulphur group with polythiosulphenamide function, of formula: Si - A - Sx - NR<1>R<2>, wherein: A is a linear or branched, divalent binding group, enabling to bind the polythiosulphenamide group to a silicon atom of the organosilicon compound; x is an integer or fractional number between 2 and 4; R<1> represents hydrogen or a monovalent hydrocarbon group; R<2> represents a monovalent hydrocarbon group selected among linear or branched C3-C8 alkyl radicals, C5-C10 cycloalkyl radicals, C6-C18 aryl radicals and (C6-C18)aryl-(C1-C8) alkyl radicals; R<1> and R<2> may together with the nitrogen atom whereto they are bound form a single hydrocarbon cycle. The invention also concerns tyres and tyre running treads comprising such a composition.