Patent ID: 6391678
Filing Date: 2002-05-21
Classification: H01L,H05K

Abstract:
A method of forming a thick-film electrical conductor with reduced solderability, the method comprising the steps of:combining an organic medium, a surfactant and metal oxide particles to coat the particles with the surfactant and yield a paste that is substantially free of agglomerates of the particles; forming a thick-film conductive ink by combining the paste with a conductive ink composition, the particles constituting up to about 4 weight percent of total solids of the thick-film conductive ink; printing the thick-film conductive ink on a substrate; drying the thick-film conductive ink, and then firing the thick-film conductive ink to yield a thick-film electrical conductor, the thick-film conductive ink containing a sufficient amount of the particles so that the thick-film electrical conductor has a lower solderability as compared to a thick-film electrical conductor formed only of the conductive ink composition.