Patent ID: 7468197

Claim:
A method for producing a flexible metal-clad laminate, the method comprising the steps of (A) applying to a metal foil a solution prepared by dissolving a heat-resistant resin containing an organic solvent-soluble condensation polymer in an organic solvent and, predrying the resulting coating film until the coating has a residual solvent content of 10 to 40% by weight to obtain a predried laminate comprising the predried heat-resistant resin layer and the metal foil, (B) winding up, in the form of a roll, the predried laminate obtained in step (A) in such a manner that its coated surface does not come into contact with its uncoated surface, and (C) heat-treating the predried laminate in the form of a roll obtained in step (B) to produce a flexible metal-clad laminate comprising a metal foil and a heat-resistant resin film layer formed on one side of the metal foil, the heat-resistant resin film layer comprising a crosslinked condensation polymer and having an N-methyl-2-pyrrolidone-insoluble content of at least 1%, wherein the heat-resistant resin is an organic solvent-soluble aromatic polyimide and/or aromatic polyamide-imide.