Patent attributes
Methods of forming a multilayer circuit comprising:a) forming a patterned array of vias in a plurality of layers of green tape;b) filling the vias in one or more of the green tape layers from (a);c) printing over at least one surface of the green tape layers from step (b) with at least one patterned layer of a thick film composition consisting essentially of:i) electrically conductive powder;ii) an inorganic binder wherein the inorganic binder is selected from TiO2 and any compounds that can generate TiO2 during firing and any one of the following compounds: Sb2O3, Co3O4, PbO, Fe2O3, SnO2, MnO, CuO and mixtures thereof; andiii) an organic medium, wherein the total inorganic binder is in the range of 0.6 wt. % to about 2 wt. % of the total composition.d) laminating the printed green tape layers from step (d) to form an assemblage comprising a plurality of unfired interconnected functional layers separated by unfired green tape; ande) cofiring the assemblage from step (d).
