Patent ID: 7523548
Filing Date: 2009-04-28
Classification: H05K,Y10T

Abstract:
1. A process for producing a printed wiring board, comprising: depositing a base of metal nickel and chromium on at least one surface of an insulating film to form a base metal layer and depositing a conductive metal layer of copper or a copper alloy on a surface of the base metal layer, thereby forming a surface metal layer; selectively removing the surface metal layer by etching with an etching solution containing at least one selected from ferric chloride, cupric chloride, and a mixture of sulfuric acid and hydrogen peroxide to form a wiring pattern; microetching the surface metal layer with a solution containing potassium persulfate; and treating the base metal layer with an etching solution containing at least one selected from a mixture of potassium permanganate and KOH, potassium bichromate, and a mixture of sodium permanganate and KOH.