Patent ID: 8142905
Filing Date: 2012-03-27
Classification: C23C,C25D,H05K,Y10T

Abstract:
1. A copper foil for a printed circuit board comprising a nickel-zinc layer including nickel, zinc, at least one of an oxide and a hydroxide of nickel, and at least one of an oxide and a hydroxide of zinc on a roughened surface of a copper foil, and a chromate film layer on the nickel-zinc layer, wherein a zinc add-on weight per unit area of the copper foil in the nickel zinc layer is 180 μg/dm 2 or more and 3500 μg/dm 2 or less, and a nickel weight ratio in the nickel-zinc layer {nickel add-on weight per unit area/(nickel add-on weight per unit area+zinc add-on weight per unit area)} is 0.38 or more and 0.70 or less, and wherein, among all zinc included in the nickel-zinc layer, 45 to 90% exists therein as zinc oxide or zinc hydroxide.