Properties Of High Performance Material Fluoropolymers

Fluoropolymers are known to exhibit exceptional resistance to chemical degradation and vapor permeation. Accordingly, these materials are desirable for use as liners in tubing, hoses, and other conduits such as for conveying fuel or fuel vapor in automotive, aerospace, or marine applications, or for conveying petroleum and other hydro carbons and organic or inorganic solvents in a variety of transport, motion control, natural resource recovery, and chemical process applications. However, fluoropolymers also known to have low surface energies and high electronegativity which, although contributing to the lubricity and ― non-stick‖ properties of such materials, often makes the bonding of other materials thereto difficult.

Advantageously, these modified fluoropolymer materials are able to be fusion bonded, such as by co-extrusion or molding, to a general purpose resin such as a polyamide or epoxy at a temperature below the thermal decomposition temperature of the resin, and preferably at a temperature within the range of between about 150-260° C. other otherwise Within the range of the preferred fusion bonding temperature of the resin.

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In this regard, the fluororesin copolymer may be formulated to have a melt viscosity which allows How of the copolymer within such temperature range. Modified fluoropolymer materials of the above described type are sold commercially by Daikin America, Inc. (Orangeburg, N.Y.) under the designations NeofonTM RP-5000 and RP-5000AS Series.

It is believed that tubular polymeric composites of two or more layers including a fluororesin layer fusion bonded directly to a nylon or other amide or general purpose resin layer would be useful as elements in a variety of hose and tubing constructions.

In this regard, in severe or even normal service environments, such as in mobile or industrial hydraulic and pneumatic applications, or in crude oil and other energy recovery applications, hoses and tubing of the type herein involved may be exposed to a variety of environmental factors and mechanical stresses that cannot always be predicted. It is anticipated, therefore, that tubing and hose constructions which offer chemical and/or moisture resistance, but which are still economical would be well received by numerous industries for use in high pressure and other fluid transfer and motion control applications.

First layer may be formed of any thermoplastic material, which may be filled or unfilled, but for reasons of cost typically will be a general purpose resin. As used herein, the term thermoplastic material‖ is used interchangeably With melt process able material, and is in contrast to non-melt processible materials such as thermosets or non-thermosetting materials Which otherwise exhibit a melt viscosity that is sufficiently high so as to preclude, How and processing by conventional melt extrusion or molding operations, and therefore necessitating that the material be processed using sintering or solvent processing techniques. Such general purpose resin materials include polyamides, polyolefin, polyesters, polyvinyl chlorides, ethylene vinyl alcohols (EVA), polyacetals, polyoxymethylenes (POM), silicones, thermoplastic rubbers (TPR) such as polyolefin ethylene-propylene-diene monomer (EPDM) and other blends, copolymer rubbers, thermoplastic polyurethanes (TPU) and other thermoplastic elastomers (TPE), and blends of any of the foregoing.