Glass manufacturing – Processes – Operating under inert or reducing conditions
Patent
1977-06-27
1978-10-17
Bashore, S. Leon
Glass manufacturing
Processes
Operating under inert or reducing conditions
65 36, 65 43, C03C 2700
Patent
active
041206789
ABSTRACT:
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 from 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. 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 or BaO.sub.2 powder in the solder glass and paste made therewith, which Pb.sub.3 O.sub.4 or BaO.sub.2 is 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 or BaO.sub.2 to accomplish this purpose. A vehicle for a glass frit comprises hydroxypropyl cellulose as a binder and a solvent for said binder.
REFERENCES:
patent: 3120433 (1964-02-01), Van Zee
patent: 3926709 (1975-12-01), Ward et al.
patent: 4058387 (1977-11-01), Nofziger
Francel Josef
King James E.
Woulbroun John M.
Bashore S. Leon
Click Myron E.
McLary Steve M.
Miga Frank W.
Owens--Illinois, Inc.
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