Sealing glass composition and method of making same

Details Sealing glass composition and method of making same Sealing glass composition and method of making same

C - Chemistry, Metallurgy

03

C

261/11, 261/17

C03C 27/10 (2006.01) C03C 3/074 (2006.01) C03C 8/24 (2006.01) C03C 12/00 (2006.01) C03C 27/00 (2006.01)

Patent

CA 1075723

ABSTRACT OF THE DISCLOSURE 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 which prevents the reduction of PbO to Pb metal during the sealing process, which reduction would other- wise result in a dielectric breakdown in the seal. A sealing glass paste consisting essentially of a PbO-B2O3-ZnO sealing glass frit and containing an effective amount of the aforementioned powder, based upon the weight of the frit, together hydroxypropyl cellulose binder for the frit and a solvent for the binder. The powder which may be employed to prevent the reduction of the PbO in the sealing glass during sealing in the presence of reducing conditions is selected from the group consisting of a hydroxide or a higher oxide of a cation, said oxide being other than Pb3O4 or BaO2, said hydroxide and oxide being thermally stable at a temperature at which the sealing glass frit seals the glass surfaces together and also being capable of being chemically reduced when exposed to the reducing conditions, and inorganic nitrate, and inorganic carbonate, and inorganic oxygen-containing chlorine compound and an inorganic dichromate the powder employed being compatible with the fired sealing glass.

238061

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