Starting mixture for an insulating composition comprising a lead glass, silk-screening ink comprising such a mixture, and the use of said ink for the protection of hybrid microcircuits on ceramic substrates

摘要

The invention relates to starting mixtures for an insulating composition comprising (a) a from about 70 to 80% by volume of vitreous phase comprising Al2O3, SiO2, B2O3, PbO, ZnO, CaO, and CuO and (b) from about 30 to 20% by volume of at least one oxide of lead having an oxidation degree of at least two, in powder form. The starting mixtures are useful in silk-screening inks for hybrid microcircuits.