Rubber composition including a hydrocarbon resin having a low glass transition temperature, a specific coupling agent and a primary amine

Abstract

A rubber composition is based on at least a diene elastomer; 50 to 160 phr (parts by weight per hundred parts by weight of elastomer) of inorganic reinforcing filler; a vulcanization system; a plasticizing system comprising at least one hydrocarbon resin with a glass transition temperature (Tg) of between −40° C. and 20° C.; as coupling agent, a hydroxysilane polysulfide corresponding to the general formula (I): (HO)RSi—R'—S—R′—SiR(OH)(I), in which the R radicals, which are identical or different, are hydrocarbon groups preferably comprising from 1 to 15 carbon atoms, the R′ radicals, which are identical or different, are divalent connecting groups preferably comprising from 1 to 18 carbon atoms, a and b, which are identical or different, are equal to 1 or 2, x is a number greater than or equal to 2; and a primary amine of formula (IV): R—NH(IV), in which R represents a linear or branched hydrocarbon group comprising from 8 to 24 carbon atoms. The composition is devoid of or comprises less than 0.5 phr of guanidine derivative.