Sealing glass vehicle and composition and method for making same
US4099977A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1977 |
| Grant date | Jul 11, 1978 |
| Priority date | — |
| Expiry date | Jun 27, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C27/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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 Pb…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.