Amber-free reduced blue glass composition
US6596660B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2001 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Oct 26, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C4/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention is a blue soda-lime-silica glass composition. The composition comprises 68 to 75% SiO2, 10 to 18% Na2O, 5 to 15% CaO, 0 to 10% MgO, 0 to 5% Al2O3, and 0 to 5% K2O, where CaO+MgO is 6 to 15% and Na2O+K2O is 10 to 20%, and colorants comprising: 0.3 to 0.8 wt. % total iron oxide as Fe2O3 wherein the ratio of FeO/total Fe as Fe2O3 is 0.35 to 0.62; 0.05 to 0.5 wt. % manganese compound as MnO2, 0 to 0.30 wt. % titanium oxide as TiO2; and 0 to 0.8 wt. % cerium oxide as CeO2. The colored glass has the following spectral properties at 4.0 mm. thickness: 65 to 81% light transmittance using Illuminant A (LTA) and using Illuminant C has a dominant wavelength of 488 to 494 nanometers with an excitation purity of 4 to 11%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.