COPPER PLATING LAYER-FITTED ROLLED COPPER FOIL

摘要

PROBLEM TO BE SOLVED: To impart excellent elasticity to rolled copper foil after a recrystallization annealing step.SOLUTION: The invention comprises: a rolled copper foil made of oxygen-free copper or a thin tin copper alloy using oxygen-free copper as a mother phase; and a copper plating layer formed on at least one side face of the main surface of the rolle copper foil or its rear face, and, in a state where the rolled copper foil is refined to re-crystals, at least a part of the crystal grains of the copper plating layer is integrated with the refined crystal grains of the rolle copper foil.