Patent ID: 6808825
Filing Date: 2004-10-26
Classification: C22C,H05K,Y10T

Abstract:
A laminate comprising a copper alloy foil laminated with a polyimide substrate formed by thermosetting polyamic acid contained in a varnish, the copper alloy foil having a surface exhibiting no roughening plating processing and the copper alloy foil consisting of at least one of 0.02 to 1.0 weight percent Ag and 0.01 to 0.5 weight percent In, the balance Cu and unavoidable impurities, said surface of the copper alloy foil being coated with an anticorrosive coating of thickness less than 5 nm and comprising benzotriazole or imidazole and onto which coating the varnish containing polyamic acid is applied before said thermosetting, the anticorrosive coating exhibiting good wettability with the varnish containing polyamic acid, and the copper alloy foil exhibiting conductivity of at least 80% IACS and 180Â° peel strength between the copper alloy foil coated with the anticorrosive coating and the polyimide substrate of at least 8.0 N/cm.