Very fast fading photochromic glass

Details Very fast fading photochromic glass Very fast fading photochromic glass

C - Chemistry, Metallurgy

03

C

96/76

C03C 4/06 (2006.01) C03C 3/093 (2006.01)

Patent

CA 1190426

Abstract of the Disclosure The present invention is directed to the preparation of photochromic glasses exhibiting a darkened luminous transmittance at 40°C below 35% and a five-minute fading rate at 40°C of at least 40 units of transmittance and a darkened transmittance at 25°C below 25% and a five-minute fading rate at 25°C of at least 25 units of transmittance. The glasses consist essentially, by weight, of: SiO2 56-60 Al2O3 6-9 B2O3 18-21 Li2O >2.5-3.5 Na2O 0.5-2.5 K2O 5-7 ZrO2 3.75-5 PbO 0.1-0.15 Ag >0.15-0.25 Cl 0.2-0.35 Br 0.075-0.15 CuO 0.004-0.02 CeO2 0-0.5 wherein the levels of Ag, Br, Cl, and CuO represent values as analyzed in the glass.

436453

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