Patent ID: 8852754
Filing Date: 2014-10-07
Classification: B32B,C22C,C25D,H05K,Y10T

Abstract:
1. A surface-treated copper foil, wherein at least one surface of the surface-treated copper foil is obtained by a process comprising roughening an untreated base copper foil, thereby obtaining a roughened surface having a surface roughness Rz of 1.1 μm or less, and applying an Ni—Zn alloy layer to the roughened surface, the roughened surface comprises sharp-pointed convexes, which have a width of from 0.3 to 0.8 μm, a height of from 0.6 to 1.8 μm, and an aspect ratio of from 1.2 to 2.2, the roughening increases the surface roughness by from 0.05 to 0.3 μm, the Ni—Zn alloy layer has a content of from 6 to 30% of Zn by weight, as calculated by: wherein a Zn deposition amount is from 0.08 to 1.28 mg/dm a Ni deposition amount is from 0.45 to 3 mg/dm a ratio of a three-dimensional surface area relative to a two-dimensional surface area of the roughened surface is 3 times or more.