HIGH INDEX BROWN PHOTOCHROMIC GLASSES

This invention is directed to photochromic glasses which darken to a brown coloration upon exposure to actinic radiation, which glasses have a refractive index of about 1.6, and Abbe number between 42-47, a density less than 2.82 g/cm3, and are preferably essentially free of TiO2. The glass composit...

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Bibliographic Details
Main Authors BROCHETON, YVES A. H, PRASSAS, MICHEL, RICOULT, DANIEL L. G
Format Patent
LanguageEnglish
French
Published 23.09.1995
Edition6
Subjects
CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS
CHEMISTRY
CONTACT LENSES
GLASS
JOINING GLASS TO GLASS OR OTHER MATERIALS
METALLURGY
MINERAL OR SLAG WOOL
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
SPECTACLES
SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES
SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS
SURFACE TREATMENT OF GLASS
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Summary:This invention is directed to photochromic glasses which darken to a brown coloration upon exposure to actinic radiation, which glasses have a refractive index of about 1.6, and Abbe number between 42-47, a density less than 2.82 g/cm3, and are preferably essentially free of TiO2. The glass compositions consist generally, in weight percent, of: SiO2 43-52 K2O 2-9 Nb2O5 0-5 B2O3 12.5-18 MgO 0-5 Ag 0.100-0.175 Al2O3 0-3 CaO 0-5 Cl 0.140-0.350 ZrO2 6-14 SrO 0-9 Br 0.093-0.195 LiO2 1.5-3.5 BaO 0-9 CuO 0.008-0.030 Na2O 0-3
Bibliography:Application Number: CA19952140954