Fluoropolymer emulsion coatings

Abstract

The present invention relates to an aqueous/oil emulsion containing fluoropolymer that is capable of forming thick coatings in a single pass, which coatings after drying and baking are free of cracks.

1 - 7 . (canceled) 
     
     
         8 . In the process of spray coating a substrate with an aqueous medium containing fluoropolymer particles, followed by drying and baking to form a release coating on said substrate, the improvement comprising carrying out said spraying in a single pass to obtain a crack-free thickness of at least 30 μm for said release coating, wherein said aqueous medium is an aqueous/oil emulsion. 
     
     
         9 . (canceled) 
     
     
         10 . In the process of spray coating a substrate with an aqueous medium containing fluoropolymer particles, followed by drying and baking to form a release coating on said substrate, the improvement comprising carrying out said spraying in a single pass to obtain a crack-free thickness of at least 30 μm for said release coating, wherein said aqueous medium is an aqueous/oil emulsion containing particles of fluoropolymer, wherein said fluoropolymer particles comprise a first group of particles having an average particle size of less than 1 micrometer and a second group of particles having an average particle size of 20-100 micrometers, and wherein the oil component of the emulsion is an aliphatic or aromatic hydrocarbon that is immiscible with water at room temperature, 15-25° C., and further wherein the emulsion has a viscosity of no less than 500 centipoises.