Method of coating a substrate with a fluoropolymer dispersion

• Main Authors: DADALAS, MICHAEL, LOEHR, GERNOT, HINTZER, KLAUS, ZIPPLIES, TILMAN
• Format: Patent
• Language: English; French; German
• Published: 10.06.2009
• Subjects: APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; METALLURGY; MINERAL OR SLAG WOOL; PERFORMING OPERATIONS; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; SPRAYING OR ATOMISING IN GENERAL; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; TRANSPORTING

The present invention provides a method of coating a substrate having a surface defined by a layer of fluoropolymer, the method comprising (i) providing an aqueous dispersion comprising: (a) particles of melt-processible fluoropolymer in an amount of 30 to 70% by weight; (b) fluorinated surfactant in an amount of not more than 250ppm based on fluoropolymer solids of the aqueous dispersion; (c) a non-ionic surfactant comprising an ethoxylated aliphatic alcohol in an amount of 2 to 15% by weight based on total solids of the aqueous dispersion; and wherein the aqueous dispersion is free or substantially free of aromatic group containing non-ionic surfactants; (ii) optionally diluting and/or adding further components to said dispersion so as to obtain a coating composition; (iii) applying said coating composition on at least part of said surface of said substrate defined by said layer of said fluoropolymer.