Patent ID: 6045713
Filing Date: 2000-04-04
Classification: C23C,H05K

Abstract:
A method of manufacturing a 2-layered flexible substrate comprises the steps of:(a) depositing an underlying metal layer A on an insulation film by a dry plating method, the metal layer comprising at least one material selected from the group consisting of nickel, nickel-copper alloy, chromium and chromium oxide,(b) depositing a further underlying metal layer B consisting of copper on said underlying metal layer A by the dry plating method;(c) depositing a primary electric copper plating layer on said further underlying metal B to form a substrate;(d) treating the surface of the thus-formed substrate with an inorganic alkaline aqueous solution, an organic alkaline solution or a mixture of these solutions;(e) depositing an electroless copper plating layer on the entire surface of the thus-treated substrate; and(f) depositing a secondary electric copper plating layer on said electroless copper plating layer to form a copper conductive layer having a thickness of 1 to 35 .mu.m.