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AssigneeOwens-Illinois, Inc.
InventorsJosef Francel, James E. King, John M. Woulbroun
Estimating the term…
A sealing glass and a sealing glass paste for sealing the face plate and funnel portion of a color television tube wherein PbO-containing sealing glass frit contains an effective amount of a powder, such as Pb.sub.3 O.sub.4 powder, which powder prevents the reduction of PbO to Pb metal during the sealing process, which reduction would otherwise result in a dielectric breakdown in the seal. Among other powders similarly found to be effective for the purpose of prevention of reduction of PbO in a PbO-containing sealing glass frit are certain other higher oxides of a cation which are selected from a group including, in addition to Pb.sub.3 O.sub.4, such higher oxides of a cation as BaO.sub.2, CrO.sub.3, MnO.sub.2, Mn.sub.2 O.sub.3, Fe.sub.2 O.sub.3, Fe.sub.3 O.sub.4, CuO, Cu.sub.2 O, Tl.sub.2 O.sub.3, Sb.sub.2 O.sub.5, TeO.sub.2, Ta.sub.2 O.sub.5, Nb.sub.2 O.sub.5, V.sub.2 O.sub.5, CeO.sub.2, Bi.sub.2 O.sub.3 and As.sub.2 O.sub.5. A sealing glass paste consisting essentially of a PbO-- B.sub.2 O.sub.3 --ZnO sealing glass frit and containing an effective amount of said powder, based upon the weight of the frit, together with hydroxypropyl cellulose binder for the frit and a solvent for the binder. A method for sealing the face plate of a color television tube to its funnel portion with a PbO-containing solder glass wherein the reduction of PbO to metallic lead during the sealing step is obviated by the addition of a sufficient amount of Pb.sub.3 O.sub.4, BaO.sub.2 or other of the mentioned higher oxide of a cation powder in the solder glass and paste made therewith, which Pb.sub.3 O.sub.4, BaO.sub.2 or other of the mentioned higher oxides of a cation will be slowly reduced to a lower oxide in a reducing atmosphere during the sealing of the television tube components. A method for increasing the dielectric properties of a PbO-containing sealing glass paste and the devitrified seal made therefrom, which seals the face plate to the funnel of a color television tube, to a value greater than that provided by the solder glass, per se, by incorporating in the solder glass and the solder glass paste made therefrom a small but sufficient amount of Pb.sub.3 O.sub.4, BaO.sub.2 or other of the mentioned higher oxide of a cation powders to accomplish this purpose. A vehicle for a glass frit comprises hydroxypropyl cellulose as a binder and a solvent for said binder.
In a PbO-containing sealing glass frit for sealing two glass surfaces together, the improvement wherein the PbO in said sealing glass frit is unreduced when said sealing glass frit is fired in the presence of reducing conditions and at temperatures at which said sealing glass frit seals said glass surfaces together, said improvement comprising incorporating in said sealing glass frit a sufficient amount of a powder of a higher oxide of a cation which is stable at the temperatures at which said sealing glass frit seals said glass surfaces together and which can be reduced to a lower oxide of the cation when exposed to said reducing conditions, said lower oxide of said cation being compatible with the fired sealing glass, said higher oxide of said cation being selected from the group consisting of Pb.sub.3 O.sub.4, BaO.sub.2, MnO.sub.2, Mn.sub.2 O.sub.3, Fe.sub.3 O.sub.4, CuO, Cu.sub.2 O, Tl.sub.2 O.sub.3, TeO.sub.2, Ta.sub.2 O.sub.5, Nb.sub.2 O.sub.5, V.sub.2 O.sub.5, CeO.sub.2 and Bi.sub.2 O.sub.3.
In a PbO-containing sealing glass frit for sealing two glass surfaces together, the improvement wherein the PbO in said sealing glass is prevented from being reduced when said sealing glass is being fired in the presence of reducing conditions at a temperature sufficient to seal said glass surfaces together, said improvement comprising incorporating in said sealing glass an amount of Pb.sub.3 O.sub.4 powder sufficient to prevent reduction of the PbO in said sealing glass during sealing in the presence of said reducing conditions.
A PbO-containing sealing glass frit having incorporated therein from about 0.1 to 1.5% Pb.sub.3 O.sub.4 powder based upon the weight of said sealing glass frit.
A sealing glass frit consisting essentially of:
In a PbO-containing seaing glass frit for sealing two glass surfaces together, the improvement wherein the PbO in said sealing glass is prevented from being reduced when said sealing glass is being fired in the presence of reducing conditions and at temperatures from about 400.degree.C at which said sealing glass frit seals said glass surfaces together, said improvement comprising incorporating in said sealing glass an amount of BaO.sub.2 powder sufficient to prevent reduction of the PbO in said sealing glass during sealing in the presence of said reducing conditions.
In a PbO-containing sealing glass frit for sealing two glass surfaces together, the improvement wherein the PbO in said sealing glass is prevented from being reduced when said sealing glass is being fired in the presence of reducing conditions at a temperature sufficient to seal said glass surfaces together, said improvement comprising having intermixed with said sealing glass frit an amount of BaO.sub.2 powder sufficient to prevent reduction of the PbO in said sealing glass frit during sealing in the presence of said reducing conditions.
In a PbO-containing sealing glass frit for sealing two glass surfaces together, the improvement wherein the PbO in said sealing glass is prevented from being reduced when said sealing glass is being fired in the presence of reducing conditions at a temperature sufficient to seal said glass surfaces together, said improvement comprising having intermixed with said sealing glass frit an amount of MnO.sub.2 powder sufficient to prevent reduction of the PbO in said sealing glass frit during sealing in the presence of said reducing conditions.
In a PbO-containing sealing glass frit for sealing two glass surfaces together, the improvement wherein the PbO in said sealing glass is prevented from being reduced when said sealing glass is being fired in the presence of reducing conditions at a temperature sufficient to seal said glass surfaces together, said improvement comprising having intermixed with said sealing glass frit an amount of Mn.sub.2 O.sub.3 powder sufficient to prevent reduction of the PbO in said sealing glass frit during sealing in the presence of said reducing conditions.
In a PbO-containing sealing glass frit for sealing two glass surfaces together, the improvement wherein the PbO in said sealing glass is prevented from being reduced when said sealing glass is being fired in the presence of reducing conditions at a temperature sufficient to seal said glass surfaces together, said improvement comprising having intermixed with said sealing glass frit an amount of Fe.sub.3 O.sub.4 powder sufficient to prevent reduction of the PbO in said sealing glass frit during sealing in the presence of said reducing conditions.
In a PbO-containing sealing glass frit for sealing two glass surfaces together, the improvement wherein the PbO in said sealing glass is prevented from being reduced when said sealing glass is being fired in the presence of reducing conditions at a temperature sufficient to seal said glass surfaces together, said improvement comprising having intermixed with said sealing glass frit an amount of CuO powder sufficient to prevent reduction of the PbO in said sealing glass frit during sealing in the presence of said reducing conditions.
In a PbO-containing sealing glass frit for sealing two glass surfaces together, the improvement wherein the PbO in said sealng glass is prevented from being reduced when said sealing glass is being fired in the presence of reducing conditions at a temperature sufficient to seal said glass surfaces together, said improvement comprising having intermixed with said sealing glass frit an amount of Cu.sub.2 O powder sufficient to prevent reduction of the PbO in said sealing glass frit during sealing in the presence of said reducing conditions.
In a PbO-containing sealing glass frit for sealing two glass surfaces together, the improvement wherein the PbO in said sealing glass is prevented from being reduced when said sealing glass is being fired in the presence of reducing conditions at a temperature sufficient to seal said glass surfaces together, said improvement comprising having intermixed with said sealing glass frit an amount of Tl.sub.2 O.sub.3 powder sufficient to prevent reduction of the PbO in said sealing glass frit during sealing in the presence of said reducing conditions.
In a PbO-containing sealing glass frit for sealing two glass surfaces together, the improvement wherein the PbO in said sealing glass is prevented from being reduced when said sealing glass is being fired in the presence of reducing conditions at a temperature sufficient to seal said glass surfaces together, said improvement comprising having intermixed with said sealing glass frit an amount of TeO.sub.2 powder sufficient to prevent reduction of the PbO in said sealing glass frit during sealing in the presence of said reducing conditions.
In a PbO-containing sealing glass frit for sealing two glass surfaces together, the improvement wherein the PbO is said sealing glass is prevented from being reduced when said sealing glass is being fired in the presence of reducing conditions at a temperature sufficient to seal said glass surfaces together, said improvement comprising having intermixed with said sealing glass frit and amount of Ta.sub.2 O.sub.5 powder sufficient to prevent reduction of the PbO in said sealing glass frit during sealing in the presence of said reducing conditions.
In a PbO-containing sealing glass frit for sealing two glass surfaces together, the improvement wherein the PbO in said sealing glass is prevented from being reduced when said sealing glass is being fired in the presence of reducing conditions at a temperature sufficient to seal said glass surfaces together, said improvement comprising having intermixed with said sealing glass frit an amount of Nb.sub.2 O.sub.5 powder sufficient to prevent reduction of the PbO in said sealing glass frit during sealing in the presence of said reducing conditions.
In a PbO-containing sealing glass frit for sealing two glass surfaces together, the improvement wherein the PbO in said sealing glass is prevented from being reduced when said sealing glass is being fired in the presence of reducing conditions at a temperature sufficient to seal said glass surfaces together, said improvement comprising having intermixed with said sealing glass frit an amount of V.sub.2 O.sub.5 powder sufficient to prevent reduction of the PbO in said sealing glass frit during sealing in the presence of said reducing conditions.
In a PbO-containing sealing glass frit for sealing two glass surfaces together, the improvement wherein the PbO in said sealing glass is prevented from being reduced when said sealing glass is being fired in the presence of reducing conditions at a temperature sufficient to seal said glass surfaces together, said improvement comprising having intermixed with said sealing glass frit an amount of CeO.sub.2 powder sufficient to prevent reduction of the PbO in said sealing glass frit during sealing in the presence of said reducing conditions.
In a PbO-containing sealing glass frit for sealing two glass surfaces together, the improvement wherein the PbO in said sealing glass is prevented from being reduced when said sealing glass is being fired in the presence of reducing conditions at a temperature sufficient to seal said glass surfaces together, said improvement comprising having intermixed with said sealing glass frit an amount of Bi.sub.2 O.sub.3 powder sufficient to prevent reduction of the PbO in said sealing glass frit during sealing in the presence of said reducing conditions.
Dependencies are inferred from the claim text.