METHOD OF PRODUCING A SURFACE-TREATED COPPER FOIL FOR A PRINTED WIRING BOARD

摘要

AN OBJECT OF THE INVENTION IS TO PROVIDE A SURFACE-TREATED COPPER FOIL CAPABLE OF CONSISTENTLY ATTAINING A PERCENT LOSS IN RESISTANCE AGAINST HYDROCHLORIC ACID DEGRADATION OF 10OR LESS AS MEASURED ON A COPPER PATTERN PREPARED FROM THE COPPER FOIL AND HAVING A LINE WIDHT OF 0.2 MM,BY BRINGING OUT THE MAXIMUM EFFECT OF THE SILANE COUPLING AGENT EMPLOYED IN COPPER FOIL COATED WITH AN ANTI-CORROSIVE LAYER FORMED OF A ZINC-COPPER-NICKEL TERNARY ALLOY. ANOTHER OBJECT IS TO IMPART EXCELLENT MOISTURE RESISTANCE TO THE SURFACE-TREATED COPPER FOIL. IN ORDER TO ATTAIN THESE OBJECTS, THE INVENTION PROVIDES A SURFACE-TREATED COPPER FOIL FOR PRODUCING PRINTED WIRING BOARDS WHOSE SURFACE HAS BEEN SUBJECTED TO NODULAR TREATMENT AND ANTI-CORROSION TREATMENT, WHEREIN THE ANTI-CORROSION TREATMENT INCLUDES FORMING A ZINC-COPPER-NICKEL TERNARY ALLOY ANTI-CORROSION PLATING LAYER ON A SURFACE OF THE COPPER FOIL; FORMING AN ELECTROLYTIC CHORMATE LAYER ON THE ANTI-CORRISON PLATING LAYER, FORMINGT A SILANE-COUPLING-AGENT-ADSORBED LAYER ON THE ELECTROLYTIC CHORMATE LAYER; AND DRYING THE COPPER FOIL FOR 2-6 SECONDS SUCH THAT THE COPPER FOIL REACHES 105°C-200°C.(FIGURE 1)