High transmittance green glass with improved UV absorption
US5776845A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1996 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Dec 17, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S501/905
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention is a green soda-lime-silica glass composition having excellent ultra violet absorbing ability while having a relatively high light transmittance. The colorants of the glass composition consist essentially of: greater than 0.5 to 1.5 wt. % total iron oxide as Fe.sub.2 O.sub.3 ; wherein the weight ratio of Fe.sup.+2 /Fe.sup.+3 is less than 0.35; 0.10 to 2.00 wt. % manganese compound as MnO.sub.2 ; and optionally any of: up to 1.00 wt. % titanium oxide as TiO.sub.2, up to 1.00 wt. % cerium oxide as CeO.sub.2 ; up to 1.00 wt. % vanadium oxide as V.sub.2 O.sub.5 ; and up to 0.20 wt. % chromium oxide as Cr.sub.2 O.sub.3 ; the glass composition having, at 4.0 mm. thickness: 55 to 80% light transmittance using Illuminant A with less than 46% ultra violet transmittance measured over the range of 300 to 400 nanometers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.