Glass frit useful for the preparation of glass bubbles, and glass bubbles prepared by using it
US5064784A · kind A · utility
23Cited by
4References
3Claims
0Family size
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Key dates
| Filing date | Apr 18, 1990 |
| Grant date | Nov 12, 1991 |
| Priority date | — |
| Expiry date | Apr 18, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C8/08
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A glass frit useful as starting material for the preparation of glass bubbles having an extremely low alkali elution, which has the following composition represented by weight percent. ______________________________________ SiO.sub.2 58-75 B.sub.2 O.sub.3 11-25 Na.sub.2 O 3-12.5 ZnO 0-3 K.sub.2 O 0-3 Al.sub.2 O.sub.3 0-3 Li.sub.2 O 0-3 P.sub.2 O.sub.5 0-3 Total alkali metal oxides Sb.sub.2 O.sub.3 0-1 3-15 As.sub.2 O.sub.3 0-1 CaO 5-15 SO.sub.3 0.05-1 MgO 0-3 B.sub.2 O.sub.3 /Na.sub.2 O 1.7-4.0 Total alkaline earth metal oxides 5-15 ______________________________________
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.