Compositions based on a fluorinated polymer comprising vinylidene fluoride units and on a butadiene-acrylonitrile elastomer

A composition comprising a mixture composed of (a) 5 to 95% by weight of at least one thermoplastic fluorinated polymer containing at least 50 mol percent of vinylidene difluoride (VF2) units and of (b) 95 to 5% by weight of at least one nitrile copolymeric butadiene/acrylonitrile elastomer, optionally hydrogenated, said nitrile elastomer being crosslinked in final form and in that the overall percentage by weight of acrylonitrile in the nitrile elastomer or elastomers is greater than or equal to 30%, said composition having been made by a process comprising providing a mixture comprising said nitrile elastomer in uncrosslinked form, crosslinking agent, and said thermoplastic fluorinated polymer, and heating the mixture at a temperature sufficient to cause the fluorinated polymer to melt and for a period of time sufficient for the nitrile elastomer to be intimately mixed with the fluorinated polymer and to be dynamically crosslinked, said crosslinking agent being a sulfur system, a sulfur-donor system, a phenolic system, or a peroxide system.