Fuel filler hose

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/28 (2006.01) B32B 1/08 (2006.01) B32B 3/14 (2006.01) B32B 7/02 (2006.01) B32B 7/04 (2006.01) B32B 25/08 (2006.01) F16L 11/04 (2006.01) F16L 11/12 (2006.01)

Patent

CA 2481915

A flexible tubular article for transport of volatile hydrocarbons permitting only negligible escape of such vapors comprises: (a) a relatively thin, inner layer of an elastomeric form of an FKM fluoropolymer, and (b) one of more relatively thin intermediate layer of a thermoplastic form of an THV fluoropolymer extruded in tubular form over the inner FKM layer, the FKM inner layer and the intermediate THV layers together having a transverse thickness sufficient to present a substantial barrier to volatile hydrocarbon escape, and (c) a durable outer layer of an elastomeric polymer bonded to the outside surface of the intermediate layer and being coextensive therewith. The intermediate layers having increasing amounts of fluorine content and at least on the intermediate layers comprises a THV grade 800.

L'invention concerne un article tubulaire flexible pour le transport d'hydrocarbures volatils, qui ne laisse s'échapper qu'une quantité négligeable de vapeurs. Cet article comprend (a) une couche intérieure relativement mince d'une forme élastomère de fluoropolymère FKM, et (b) une ou plusieurs couche(s) intermédiaire(s) relativement mince(s) d'une forme thermoplastique de fluoropolymère THV, extrudée(s) sous forme tubulaire sur la couche intérieure de FKM, cette dernière couche ainsi que les couches intermédiaires THV présentant ensemble une épaisseur transversale suffisante pour former une barrière substantielle contre les fuites d'hydrocarbures volatils, et (c) une couche extérieure durable en polymère élastomère, liée à la surface extérieure de la couche intermédiaire et coextensive à celle-ci. Les couches intermédiaires renferment des quantités accrues de fluor et, au moins une des couches intermédiaires comprend un THV de qualité 800.

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