COPPER FOIL FOR WIRING BOARD AND WIRING BOARD

摘要

PROBLEM TO BE SOLVED: To provide copper foil for wiring boards which combines resin adhesion desirable for wiring boards and visibility after formation of a circuit pattern.SOLUTION: In copper foil for wiring boards, the surface of electrolytic copper to be adhered with a resin has a diffuse reflectance (R) at the 600-nm wavelength of 5-50% and a color saturation (C) of 50 or smaller. In the electrolytic copper foil for wiring boards, the lightness index (L) is preferably 75 or smaller, and the total light reflectance (R) at the 600-nm wavelength is more preferably 10-55%.