Composite tubular article composed of a vulcanized elastomer associated with a thermoplastic elastomer containing polyamide sequences, specially for a fuel hose and process for its manufacture.

摘要

The invention relates to a composite tubular article composed of a vulcanised elastomer containing carboxylic acid or carboxylic diacid anhydride functions, combined with a polyamide-block thermoplastic elastomer. The invention also relates to a process for making such articles, characterised in that a tube consisting of an outer layer made of polyamide-block thermoplastic elastomer and, possibly, of an inner layer consisting of a thermoplastic having good liquid-barrier properties is jacketed, by extrusion at a suitable temperature, with an elastomeric composition comprising a synthetic or natural elastomer containing carboxylic acid or carboxylic diacid anhydride functions, a crosslinking system and, possibly, various additives and fillers, in that the composite tubular article obtained is vulcanised, preferably at a temperature of between -5@C and +30@C with respect to the Vicat softening point of the said polyamide-block thermoplastic elastomer. This process leads to composite tubular articles having excellent properties, especially flexibility and peel strength of the outer layer. The invention also relates to the fuel hoses formed by such articles, the inner face of the thermoplastic tube of which is coated with a polymer for protection from liquids and, preferably, from fuels.