Photochromic glasses suitable for simultaneous heat...

Details Photochromic glasses suitable for simultaneous heat... Photochromic glasses suitable for simultaneous heat...

C - Chemistry, Metallurgy

03

C

96/76, 49/83.1

C03C 21/00 (2006.01) C03C 4/06 (2006.01)

Patent

CA 1118624

PHOTOCHROMIC GLASSES SUITABLE FOR SIMULTANEOUS HEAT TREATMENT AND SHAPING Abstract of the Disclosure The instant invention is related to the manufacture of photochromic glasses having base compositions with m a very narrow interval of the alkali metal boroaluminosilicate system wherein silver chloride and/or silver bromide crystals impart photochromic properties. The glasses are notable for their rapid fading characteristics and relatively low tem- perature dependence of darkening. The compositions are especially suitable for a production process which contemplates simultaneously shaping articles from glass sheet and developing photochromic properties therein.

321103

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