Coating of porous, hydrophobic substrates with thermoplastic fluoropolymers
AssigneeDyneon LLC
InventorsHermann Bladel, Ludwig Mayer, Manfred Schmid
Life of this patent
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Abstract
If hydrophobic substrates are coated--if appropriate under pressure--with an aqueous dispersion of a thermoplastic fluoropolymer having a number-average particle size of up to 100 nm and the fluoropolymer is fixed on the substrate thus impregnated by heat treatment, firmly adhering coatings are obtained.
Claims14
A process for coating porous hydrophobic substrates with fluoropolymers, which comprises bringing a porous hydrophobic substrate into contact with an aqueous dispersion of a thermoplastic fluoropolymer having a number-average particle size of up to 100 nm and said thermoplastic fluoropolymer being a copolymer containing a sufficient amount of co-monomer other than tetrafluoroethylene in order to provide its thermoplastic properties, so that said thermoplastic fluoropolymer is processable from a melt, impregnating the substrate with the dispersion forming an article, and then after-treating the article thus impregnated with heat to adhere the fluoropolymer to the substrate.
Dependencies are inferred from the claim text.