Patent ID: 8568899
Filing Date: 2013-10-29
Classification: C23C,C25D,H05K,Y10T

Abstract:
1. A metal covered polyimide composite obtained by feeding around one or two plating drums in one or two plating baths a polyimide film comprising a tie-coat layer and a metal seed layer formed on a surface of a polyimide film by electroless plating or a dry method, and a copper layer or a copper alloy layer directly formed on the metal seed layer by electroplating in the one or two plating baths, wherein the copper layer or copper alloy layer consists of two or three separately-applied plating layers of copper or copper alloy with a boundary being formed and located between each adjacent pair of the separately-applied plating layers, including a concentrated portion of impurities at the boundary or boundaries, wherein each of said two or three separately-applied plating layers of copper or copper alloy has a thickness within a range of 2.07 μm to 8.50 μm without a boundary containing concentrated impurities extending therein, and wherein no further layers of copper or copper alloy are plated on said two or three separately-applied plating layers of copper or copper alloy of the metal covered polyimide composite.