Patent ID: 6989199

Claim:
A copper foil for a printed-wiring board, said copper foil comprising a nodular treated side to be bonded to a substrate, wherein a nickel layer is provided on the nodular treated side, wherein the thickness (X) of the nickel layer is 0.7 g/m 2 to 45 g/m 2 ; a zinc layer or a zinc alloy layer wherein the thickness (Y) of the zinc layer is 0.01 g/m 2 to 2 g/m 2 is provided on the nickel layer and an equivalent thickness (T) of nickel layer and zinc layer or zinc alloy layer calculated from Equation 1 is smaller than or equal to 5 μm, T =( X/ 8.85)+( Y/ 7.12)(μm) Equation 1 Specific gravity of nickel: 8.85 g/cm 3 Specific gravity of zinc: 7.12 g/cm 3 .