EXTRA-THIN COPPER FOIL, METHOD FOR PRODUCING THE SAME, AND EXTRA-THIN COPPER LAYER

摘要

PROBLEM TO BE SOLVED: To provide extra-thin copper foil in which the thickness precision of an extra-thin copper layer on supporting copper foil is improved.SOLUTION: The extra-thin copper foil comprises: a supporting copper foil; a peeling layer laminated on the supporting copper foil; and an extra-thin copper layer laminated on the peeling layer, and in which the thickness precision of the extra-thin copper layer measured by a weight thickness method is 3.0% or lower.