Patent ID: 8642893
Filing Date: 2014-02-04
Classification: C23C,C25D,H05K

Abstract:
1. A copper foil for printed circuits, comprising a copper foil, a plated roughened layer of a copper-cobalt-nickel alloy formed on a surface of the copper foil, a plated layer of a cobalt-nickel alloy formed on the plated roughened layer, and a plated layer of a zinc-nickel alloy formed on the plated layer of the cobalt-nickel alloy; wherein the plated layer of the zinc-nickel alloy has a nickel content of 50 μg/dm 2 or more, and a total amount of deposited zinc and nickel, M, and a nickel ratio, N, of the plated zinc-nickel alloy are in an area of a two dimensional coordinate space of M (μg/dm 2 ) as a vertical axis and N as horizontal axis, the area being defined by lines N=0.16, N=0.40, M=500, and a polygonal line connecting coordinate points of the coordinate space, A(0.16, 500), B(0.17, 400), C(0.18, 300), P(0.22, 273) Q(0.29, 307), R(0.34, 344) and S(0.40, 394).