Patent ID: 7396870

Claim:
A cross-linkable or cross-linked rubber composition usable to constitute a tread for a tire, wherein said composition comprises: (a) a reinforcing filler comprising a reinforcing inorganic filler, wherein the mass fraction of said reinforcing inorganic filler in said reinforcing filler is greater than 50%; (b) at least one diene elastomer having a molar ratio of units originating from conjugated dienes which is greater than 30% and comprising carboxylic acid functions along its chain, wherein said diene elastomer comprising carboxylic acid functions along its chain is obtained, in emulsion, by a copolymerization process including adding to an emulsifying solution a co-monomer comprising an unsaturated aliphatic carboxylic acid, such that said at least one diene elastomer comprises unsaturated aliphatic carboxylic acid function along its chain; (c) a reinforcing inorganic filler/diene elastomer coupling agent; and (d) a sulphur-based cross-linking system.