E.i. Dupont De Nemours and Company

Thomas P Concannon

Eustathios Vassiliou

Robert F Davis

Mitzie K Rummel

Chester G Bragaw, Jr

Eva M Vary

A process for preparing laminates of polyvinyl fluoride and at least one other fluoropolymer that are free from adhesive at the interface by dispersion coating a first film to form a second film and curing the second film at a temperature below the melting point of the first film.

Method of making fluoropolymer laminates

Laminates of polyvinyl fluoride and at least one other fluoropolymer that are free from adhesive at the interface and a process for preparing the laminates by dispersion coating a first film to form a second film and curing the second film at a temperature below the melting point of the first film.

Fluoropolymer laminates

Zeolites, including ultramarine blue retard the oxidative degradation of melt processible perfluorocarbon resins including FEP and PFA at elevated temperatures. Coating compositions of the perfluorocarbon resin, zeolite, and iron-containing pigments are provided.

Melt processable perfluorocarbon resin with degradation retarder

Zeolites, including ultramarine blue, retard the oxidative degradation of polytetrafluoroethylene resin (PTFE) at elevated temperatures. Coating compositions of PTFE, zeolites, acrylic resin and iron-containing pigments are provided.

Polytetrafluoroethylene resin with degradation retarder

Aqueous dispersions of fluorocarbon polymers in combination with the water-borne reaction product of (a) carboxyl-functional polymers, (b) polyepoxides and (c) tertiary amines are provided. Such dispersions can be applied to a variety of substrates by either conventional coating techniques or electrodeposition, and provide coatings that exhibit excellent release properties and high lubricity.

Article coated with aqueous dispersion of fluoropolymers in combination

Articles coated with multilayers of a composition of polytetrafluoroethylene plus a specified proportion of copolymers of perfluorinated polyvinyl ether and tetrafluoroethylene, to which is optionally added a heat stable polymer with a glass-transition temperature greater than or equal to 130.degree. C., are found to have improved durability. The proportion of the copolymer in each layer varies such that there is a maximum amount in the bottom layer with decreasing proportions in the other layer or layers.

Article coated with fluoropolymer finish with improved durability

Aqueous dispersion of fluoropolymers in combination with epoxy-type film

Blends of PTFE and perfluorinated ether copolymers of TFE and perfluoro(propyl vinyl ether) provide coating compositions which have reduced crystallinity and useful lives superior to what would be expected from averaging the properties of the unblended resins themselves.

Fluoropolymer blend coating compositions containing copolymers of

Aqueous dispersions of polymers of tetrafluoroolefin and tetrafluoroolefin/hexafluoropropylene containing other film-forming materials such as polyamide acid salts or polymeric quaternary hydroxides blended with nitrogen-resins and articles coated or impregnated with these dispersions are provided. Coatings prepared from such dispersions provide lubricity, release properties, chemical and high temperature resistance, and electrical insulation for a wide variety of substrates such as metals, ceramics and the like.

Aqueous dispersions of perfluoroolefin polymers containing film-forming

A coating composition, useful for preventing offset of toner to a heated fuser roll, comprises a dispersion of

Method for providing heated fuser roll with improved release and wear

Compositions containing fluoropolymer, alkali metal silicate, the salt of a polyamide acid, a coalescing agent and a liquid carrier are useful for priming metal, especially cookware, before topcoating it with a fluoropolymer enamel.

Fluoropolymer coating compositions having improved adhesion

High solids, low viscosity, stable aqueous solutions of polyamide acids, which are precursors of polyimide polymers, can be prepared from the polyamide acids, a tertiary amine, a coalescing agent such as N-methylpyrrolidone, and a viscosity reducing agent such as furfuryl alcohol. These aqueous solutions are capable of depositing a uniform film and of being cured into polyimides.

Aqueous solutions of polyamide acids which can be precursors of

Compositions containing fluoropolymer, colloidal silica, the salt of a polyamide acid, a coalescing agent and a liquid carrier are useful for priming metal, especially cookware, before topcoating it with a fluoropolymer enamel.

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Newtown Square, PA, United States of America

Thomas P Concannon