Single Layer Or Multilayer Tubular Structure Based On Recycled Polyamide

Abstract: The present invention relates to a composition comprising: (a) 30% to 99.8% by weight, more particularly 50% to 99.8% by weight of recycled material originating from a used single-layer and/or multilayer tube and/or tank having initially transported or contained motor vehicle fluids, more particularly air, oil, water, urea solution, glycol-based coolant, or a fuel such as petrol, more particularly alcohol petrol, biopetrol or diesel, more particularly biodiesel, or hydrogen, said tube and/or said tank consisting of a composition comprising predominantly at least one polyamide, said used single-layer and/or multilayer tube and/or said used tank having been ground into pellets, and the residues of fluids present in said tube and/or tank having been wholly or partly extracted, before or after grinding of said tube and/or tank; (b) up to 70%, more particularly up to 50% of a semi-crystalline aliphatic polyamide; (c) up to 0.2% of an additive, said polyamide of said used tube and/or tank having functions deriving from oxidation reactions and selected from primary amide functions, nitrile functions, chain-end methyl group functions, alkene functions, formamide functions, imide functions, carboxylic acid functions and alcohol functions and mixtures thereof, in a molar ratio greater than that of the same polyamide forming an unused tube and/or tank which has not as yet ever transported or contained motor vehicle fluids.

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