PRODUCTION OF ELECTROLYTIC COPPER FOIL

摘要

PROBLEM TO BE SOLVED: To prepare electrolytic copper foil of a low profile which is useful for production of printed circuit boards and has an excellent etching property. SOLUTION: A sulfuric acid acidic copper sulfate soln. is passed as an electrolyte between a rotating cathode and an anode facing this cathode in this process for producing the electrolytic copper foil. In such a case, this sulfuric acid acidic copper sulfate soln. contains thiourea and/or its deriv. at >=0.5ppm and the flow velocity of the liquid is specified to >=1.5m/sec. The surface roughness (Rz) of the matte surface of the electrolytic copper foil is <=3μm.