Method for forming polymer films having bubble release surfaces

Abstract

The invention is a method for forming polymer films having a roughened surface using removable substrates comprising: (a) providing a removable substrate with a roughened surface; (b) forming a dispersion of a perfluorinated polymer containing sites convertible to ion exchange groups in a dispersant having: a boiling point less than about 110.degree. C.; a density of from about 1.55 to about 2.2; and a solubility parameter of from greater than about 7.1 to about 8.2 hildebrands; (c) depositing the dispersion onto the roughened, removable substrate; (d) removing the dispersant from the dispersion; and (e) removing the substrate. Particularly preferred as a dispersant is a compound represented by the general formula: XCF.sub.2 --CYZX' wherein: X is selected from the group consisting of F, Cl, Br, and I; X' is selected from the group consisting of Cl, Br, and I; Y and Z are independently selected from the group consisting of H, F, Cl, Br, I and R'; R' is selected from the group of perfluoroalkyl radicals and chloroperfluoroalkyl radicals having from 1 to 6 carbon atoms. The most preferred dispersant is 1,2-dibromotetrafluoroethane.

Dependencies are inferred from the claim text.