Glass manufacturing – Processes – With chemically reactive treatment of glass preform
Patent
1984-06-06
1985-10-29
Schor, Kenneth M.
Glass manufacturing
Processes
With chemically reactive treatment of glass preform
501 13, C03C 326
Patent
active
045498946
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:
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Araujo Roger J.
Hares George B.
Kerko David J.
Morgan David W.
Morse David L.
Corning Glass Works
Janes, Jr. C. S.
Schor Kenneth M.
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