C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
96/76
C03C 3/04 (2006.01) C03C 3/062 (2006.01) C03C 4/06 (2006.01)
Patent
CA 1087436
ABSTRACT OF THE DISCLOSURE Fast-response photochromic boron-free alumino-phosphate glasses which have silver halide crystals dispersed throughout the glass comprise, in weight percentages:- SiO2 10 to 17% Al2O3 20 to 29% P2O5 30 to 40% R2O 8.5 to 17% R'O 4 to 18% where R2O is taken from the group consisting of Na2O, K2O, and combinations thereof; R'O is taken from the group consisting of CaO, BaO and combinations thereof provided that when in combination, CaO is present up to 7%; the total of SiO2 + Al2O3 + P2O5 amounting to not less than 69% by weight of the glass. Preferably the total of SiO2 + P2O5 + Al2O3 is not less than 72% by weight of the glass. The silver content of the glass, expressed as Ag2O, is preferably not less than 0.05%. Refractive index nD can be corrected to the standard ophthalmic value of 1.523 by additions of TiO2, ZrO2 and/or PbO.
270454
Ellis Edric
Gelder Richard
Hale Allan
Meredith & Finlayson
Pilkington Brothers Limited
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