Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
Patent
1974-10-22
1976-08-10
Douglas, Winston A.
Compositions: coating or plastic
Coating or plastic compositions
Metal-depositing composition or substrate-sensitizing...
106 47R, 106 49, 65 32, 106193R, C03C 304, C03C 310
Patent
active
039739759
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 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.
REFERENCES:
patent: 2495607 (1950-01-01), Schaefer
patent: 2949376 (1960-08-01), Comer
patent: 3250631 (1966-05-01), Lusher
patent: 3370966 (1968-02-01), Schwartz
patent: 3445256 (1969-05-01), Dalton
patent: 3672919 (1972-06-01), Sack
Francel Josef
King James E.
Woulbroun John M.
Bell Mark
Dence Richard B.
Douglas Winston A.
Holler E. J.
Owens--Illinois, Inc.
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