| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a carrier-fitted copper foil exhibiting a high adhesion force between a carrier and an ultrathin copper foil before a step of being laminated on an insulating substrate, easily peelable via the carrier-ultrathin copper foil interface after the step of being laminated on an insulating substrate, and having a favorable etchability.SOLUTION: The intermediate layer of the provided carrier-fitted copper foil comprises Ni. In a case where, on an occasion for peeling an ultrathin copper layer therefrom in compliance with JIS C 6471, the Cr atom concentration (%), Zn concentration (%), Ni concentration (%), Cu concentration (%), oxygen concentration (%), carbon concentration (%), and the concentration of others (%) along the depth direction ascertained as a result of X-ray photoelectron spectroscopic (XPS) surface analysis (x: unit nm) are defined respectively as e(x), f(x), g(x), h(x), i(x), j(x), and k(x),∫g(x)dx/(∫e(x)dx+∫f(x)dx+∫g(x)dx+∫h(x)dx+∫i(x)dx+∫j(x)dx+∫k(x)dx) satisfies the condition of 5.0% or less within the zone [0, 1.0] of analysis along the direction of depth from the intermediate layer-side surface of the ultrathin copper layer.</p> |
