Lead- and cadmium-free finely divided glass frit compositions
US5674789A · kind A · utility
11Cited by
2References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 23, 1996 |
| Grant date | Oct 7, 1997 |
| Priority date | — |
| Expiry date | Feb 23, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C3/15
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A lead- and cadmium-free glass-frit composition based on a borate glass and containing 4 to 22 mole % La.sub.2 O.sub.3 and 0 to 10 mole % SiO.sub.2 as network-forming oxides and B.sub.2 O.sub.3, wherein the molar ratio of B.sub.2 O.sub.3 to La.sub.2 O.sub.3 is at least 3 to 1. The compositions have an alpha in a range between approximately 50.cndot.10.sup.-7 K.sup.-1 and approximately 100.cndot.10.sup.-7 K.sup.-1 and the start of melting Td in a range between 470.degree. and 670.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.