Abstract: The invention relates in particular to a crosslinkable rubber composition and to a process for preparing same. The composition is based on an elastomer, comprises a crosslinking system and a thermoplastic phase with melting point Tm dispersed as nodules, and comprises the product: a) of a melt reaction by thermomechanical working of the elastomer and other ingredients, apart from the system, then b) of mechanical working with prior addition of the system. According to the invention: the dimension of the nodules is between 10 nm and 10 pm, a) comprises heating the mixture up to a temperature >Tm maintained for a holding time, and the system comprises sulfur when the elastomer is unsaturated and said phase comprises saturated chains, and comprises a peroxide when the elastomer is saturated.

Abstract: The invention relates to a rubber composition for a mechanical member with a dynamic function, to a process for preparing this composition, to such a member and to a use of a polymer bearing urethane functions. The composition is based on at least one elastomer and comprises a reinforcing filler and said polymer dispersed in the elastomer, the composition comprising the product of an in situ thermomechanical blending reaction of the elastomer with the filler, precursors of the polymer and a chain extender. According to the invention, the composition has a ratio G? 0.5%/G? 20% of storage moduli G? relative to the complex shear moduli G* satisfying at least one of the following conditions (i) to (v), G? 0.5% and G? 20% being measured according to the standard ISO 4664 at respective dynamic strain amplitudes of 0.5% and 20%, on double shear test specimens subjected to shear strains of from 0.02% to 50% at the same frequency of 5 Hz and at the same temperature T: G? 0.5%/G? 20% ?1.15 for T=100° C.

Abstract: Thermoplastic/elastomer composite product, in particular a hose for transporting a coolant for an automobile air-conditioning circuit, comprising an internal layer formed from a plastic alloy comprising a nylon-6 and at least 51% of a modifier chosen from among ethylene-acrylate-acrylic acid terpolymers and a layer formed from a blend of an elastomer, such as a brominated butyl rubber modified by a grafted 1,2-vinyl polybutadiene, a silane, an ethylene-acrylic acid copolymer or an ethylene-propylene copolymer grafted with maleic anhydride, with complete adhesion between the thermoplastic and the elastomer.