Patent ID: 7820232
Filing Date: 2010-10-26
Classification: H01B,H05K

Abstract:
1. A process for forming a copper-based fine pattern consisting of a sintered product layer made of copper nano-particles sintered with each other, which process comprises the steps of: drawing a layer coated on a substrate, which layer has a fine pattern, by using a dispersion containing copper oxide nano-particles or copper nano-particles provided with a surface oxide film layer, which particles have an average particle diameter of 1 to 100 nm, together with a dispersion medium thereof and subjecting the copper oxide nano-particles or the copper nano-particles provided with the surface oxide film layer contained in the coated layer drawn by using the dispersion to a reducing treatment, wherein the copper oxides or surface oxide film layer are reduced at a heating temperature selected form the range of 180° C. to 300° C. by using an organic compound having reducing activity, and further a baking treatment wherein the copper nano-particles resulting from the reducing treatment are baked at the heating temperature selected from the range of 180° C. to 300° C. to form a sintered product layer made of the copper nano-particles in the fine pattern,