Patent ID: 7056448
Filing Date: 2006-06-06
Classification: C23C,H05K,Y10T

Abstract:
1. A method for forming a circuit pattern comprising at least a step (a) of subjecting a non-conductor to electroless copper plating to form a copper film and a step (b) of etching the copper film so as to form a circuit pattern, which comprises using, as a catalyst for the electroless copper plating, a silver colloidal solution comprising, as essential components, at least the following (I), (II) and (III): (I) silver colloidal particles, (II) one or more of ions of a metal having an electric potential which can reduce silver ions to metal silver in the solution or/and ions which result from oxidation of the ion at the time of reduction of the silver ions, and (III) one or more of hydroxycarboxylate, condensed phosphate and/or amine carboxylate ions, wherein the one or more hydroxycarboxylate ions are selected from the group consisting of glycolate, lactate, glycerate, tartronate, malate, tartarate, citrate, and gluconate, the silver colloidal particles (I) being produced by the ion (II) of the metal having an electric potential which can reduce silver ions to metal silver.