Patent ID: 6939620

Claim:
Copper alloy foil for lamination with a resin substrate, the copper alloy foil consisting of at least one of 0.01-2.0 weight percent Cr and 0.01-1.0 weight percent Zr, a balance to total 100 weight percent being copper and unavoidable impurities, said copper alloy foil having an anticorrosive coating of thickness less than 3 nm, said copper alloy foil having a surface exhibiting no artificial roughening and having a surface roughness less than 2 μm, expressed as ten-point average surface roughness, tensile strength at least 620 N/mm 2 and conductivity at least 64% IACS, and 180° peel strength between the copper alloy foil and an adhesive containing an epoxy resin bonding the copper alloy foil to a resin substrate is at least 8.9 N/cm.