Abstract: A rubber composition usable for manufacturing a metal/rubber composite and capable of adhering to a metallic reinforcing member, comprising at least one diene elastomer, a reinforcing filler, a cross-linking system and between 0.1 and 10 phr of acetylacetonate of a lanthanide.

Abstract: Rubber composition usable for the manufacture of metallic rubberised fabrics and capable of adhering to a metallic reinforcing member, comprising a diene elastomer, a reinforcing filler, a cross-linking system and an adhesion promoter, said adhesion promoter comprising at least one lanthanide compound, preferably an organolanthanide. Metal/rubber composite comprising such a composition and its use for the manufacture or the reinforcement of ground contact systems of motor vehicles such as tires. Ground contact systems and semi-finished rubber products, in particular tires, comprising such a composite. The lanthanide compound imparts to the composition and to the composite improved adhesive properties after thermal ageing, in particular in humid conditions. It may be used alone or in combination with a cobalt compound, in particular in carcass or crown reinforcements of passenger-vehicle or heavy-vehicle tires.