Use of a hose based on an irradiation-grafted fluoropolymer for transporting petrol in service station

• Main Authors: O'BRIEN, GREGORY, SEBIRE, PASCAL, WERTH, MICHAEL, BONNET, ANTHONY, CHOPINEZ, FABRICE
• Format: Patent
• Language: English
• Published: 11.02.2007
• Subjects: BLASTING; BOTTLES, JARS OR SIMILAR CONTAINERS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISEPROVIDED FOR; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; LIGHTING; LIQUID HANDLING; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; METALLURGY; OPENING, CLOSING; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THEIR PREPARATION OR CHEMICAL WORKING-UP; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS

According to a first embodiment, the present invention relates to the use for transporting petrol in a service station of a hose comprising: an inner layer in cont with the fluid to be transported, consisting of a fluoropolymer onto which an unsaturated monomer has been irradiation-grafted and, directly attached to the latter, a polyolefin outer layer. According to a variant, the hose comprises a fluoropolymer, preferably PDVF, layer placed beside the irradiation-grafted fluoropolymer. According to a second embodiment, the hose comprises: a central layer consisting of an irradiation-grafted fluoropolymer and, directly attached to the latter, a polyolefin outer layer and a polyolefin inner layer. The polyolefin inner layer is the layer in contact with the petrol. According to a variant, the irradiation-grafted fluoropolymer layer is replaced with a layer of a blend of a fluoropolymer, preferably PVDF, and of an irradiation-grafted fluoropolymer. According to a third embodiment, the hose comprises: a central layer consisting of a polyolefin and, directly attached to the latter, an irradiation-grafted fluoropolymer outer layer and an irradiation-grafted fluoropolymer inner layer. According to a variant, at least one of the layers of irradiation-grafted fluoropolymer (optionally blended with a fluoropolymer) is covered with a fluoropolymer, preferably PVDF, layer The irradiation-grafted fluoropolymer layer is a tie layer between the PVDF layer and the polyolefin layer. The inner layer in contact with the petrol is therefore either a fluoropolymer (preferably PVDF) layer or an irradiation-grafted fluoropolymer layer or a layer of a blend of a fluoropolymer, preferably PVDF, and of an irradiation-grafted fluoropolymer.