Alkali-free glass
US7582581B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 2004 |
| Grant date | Sep 1, 2009 |
| Priority date | — |
| Expiry date | Feb 20, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C3/091
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A subject for the invention is to provide an alkali-free glass which is capable of reducing or totally eliminating As2O3 and which has fewer bubble inclusion than that in the prior technology.The invention relates to an alkali-free glass which comprises SiO2 in an amount of from 40 to 70% by weight; Al2O3 in an amount of from 6 to 25% by weight; B2O3 in an amount of from 5 to 20% by weight; MgO in an amount of from 0 to 10% by weight; CaO in an amount of from 0 to 15% by weight; BaO in an amount of from 0 to 30% by weight; SrO in an amount of from 0 to 10% by weight; ZnO in an amount of from 0 to 10% by weight, each based on the total amount of said glass, and helium and/or neon in an amount of from 0.0001 to 2 μl/g (0° C., 1 atm.).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.