Ultraviolet absorbing photochromic glass of low silver content
US4549894A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1984 |
| Grant date | Oct 29, 1985 |
| Priority date | — |
| Expiry date | Jun 6, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C3/091
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
There is disclosed a method of producing a photochromic glass having a reduced transmittance for ultraviolet radiation while having substantially unimpaired photochromic properties. The method comprises providing a combination of 0.1-1.0% CeO.sub.2 and 0.1-1.5% Sb.sub.2 O.sub.3 and/or As.sub.2 O.sub.3 as part of the glass composition. In an embodiment utilizing minimal silver content, the glass article in thicknesses of 1.3 to 2.0 mm. can be chemically strengthened to surpass the impact specification imposed by the Federal Food and Drug Administration for eyewear, will transmit less than 0.2% of radiation having wavelengths between 290-315 nm, and will demonstrate a darkened luminous transmittance at 20.degree.-25.degree. C. below 35% and a fading rate such that after five minutes the luminous transmittance will be at least 1.75 times that of the darkened transmittance. These glasses consist essentially of: ______________________________________ SiO.sub.2 55-61 Ag >0.1-<0.2 B.sub.2 O.sub.3 18-21 Cl 0.2-0.6 Al.sub.2 O.sub.3 5-11 Br 0.05-0.2 Li.sub.2 O 1.5-3 CuO 0.003-0.015 Na.sub.2 O 2-5 CeO.sub.2 0.1-1.0 K.sub.2 O 4.5-8 Sb.sub.2 O.sub.3 0.1-1.5 _____________________________________…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.