Compositions of silico-sodo-calcic glasses and their applications
US5958812A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1997 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Dec 16, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47B2200/0094
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention concerns a thermally stable glass composition, which comprises the following constituents in the following proportions by weight: ______________________________________ SiO.sub.2 45 to 68% Al.sub.2 O.sub.3 0 to 20% ZrO.sub.2 0 to 20% B.sub.2 O.sub.3 0 to 10% Na.sub.2 O 2 to 12% K.sub.2 O 3.5 to 9% CaO 1 to 13% MgO 0 to 8% ______________________________________ the sum of the contents of the oxides SiO.sub.2, Al.sub.2 O.sub.3 and ZrO.sub.2 remaining equal to or less than 70%, the sum of the oxides Al.sub.2 O.sub.3 and ZrO.sub.2 being equal to or greater than 2%, the sum of the alkaline oxides Na.sub.2 O and K.sub.2 O being equal to or greater than 8%, said composition comprising, if desired, the oxides BaO and/or SrO in proportions such that: EQU 11%.ltoreq.MgO+CaO--BaO+SrO>30% This glass composition may be used for the production of substrates for an emissive screen or for that of a fire-resistant pane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.