Chemically durable phosphate opal glasses
US4309218A · kind A · utility
4Cited by
6References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1980 |
| Grant date | Jan 5, 1982 |
| Priority date | — |
| Expiry date | Nov 3, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C4/005
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention relates to the manufacture of spontaneous opal glasses demonstrating a dense, milky-white appearance, excellent resistance to attack by water and detergents, softening points in excess of 760.degree. C., and containing either NaBaPO.sub.4 or Na.sub.5 P.sub.3 O.sub.10 as the predominant crystal phase. The glasses consist essentially, expressed in weight percent on the oxide basis, of 6-12% Na.sub.2 O, 5-16% BaO, 0.9-7% Al.sub.2 O.sub.3, 2-7% B.sub.2 O.sub.3, 55-70% SiO.sub.2, and 5-9% P.sub.2 O.sub.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.