Importance

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Abstract

Provided is a copper foil with surface treated layers, wherein a copper foil or a copper alloy foil includes a plurality of surface treated layers configured from a roughened layer formed on the copper foil or the copper alloy foil by roughening treatment, a heat-resistant layer made from a Ni—Co layer formed on the roughened layer, and a weathering layer and a rust-preventive layer which contain Zn, Ni, and Cr and is formed on the heat-resistant layer, and the surface treated layers having a (total Zn)/[(total Zn)+(total Ni)] ratio of 0.13 or more and 0.23 or less. In a copper foil clad laminate which uses a copper foil for a printed circuit obtained by performing roughening treatment on a surface of a copper foil and then forming a heat-resistant layer and a rust-preventive layer thereon, and to which silane coupling treatment is subsequently performed, the copper foil for a printed circuit can further inhibit the deterioration in adhesion caused by the acid infiltration into the interface of the copper foil circuit and the substrate resin upon performing acid treatment or chemical etching to the substrate after forming a fine-pattern printed circuit. Thus, the copper foil for printed circuit has superior acid-resistant adhesive strength and superior alkali etchability.

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First Claim