C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
96/76
C03C 4/06 (2006.01) C03C 3/093 (2006.01) C03C 3/097 (2006.01) C03C 3/118 (2006.01)
Patent
CA 1270689
Abstract of the Disclosure This invention is directed to transparent photochromic glasses that can darken to a comfort range, i.e., between about 35-60%, or to a dark range, i.e., below 35%, depending upon glass composition, and will exhibit a faded transmittance after five minutes' removal from actinic radiation higher than 70%. The base compositions of the glasses consist essentially, in weight percent, of about SiO2 46-60 MgO 0-3.5 B2O3 16-28 CaO 0-6 Al2O3 4-11 SrO 0-6 ZrO2 2-6 BaO 0-6 Al2O3+ZrO2 6-13 MgO+CaO+SrO+BaO 0-7 Li2O 2-5 P2O5 0-5 Na2O 0-4 TiO2 0-3 K2O 2.5-9 For a comfort glass the photochromic elements consist essentially, as analyzed, of Ag 0.13-0.18 Br 0.08-0.14 Cl 0.16-0.34 CuO 0.001-0.004 For a dark glass the photochromic elements consist essentially, as analyzed, of Ag 0.15-0.3 Br 0.07-0.14 Cl 0.2-0.45 CuO 0.004-0.016
513455
Mazeau Jean-Pierre
Prassas Michel
Corning Incorporated
Gowling Lafleur Henderson Llp
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