Photochromic borosilicate glasses containing dispersed...

Details Photochromic borosilicate glasses containing dispersed... Photochromic borosilicate glasses containing dispersed...

C - Chemistry, Metallurgy

03

C

96/76

C03C 3/064 (2006.01) C03C 4/06 (2006.01)

Patent

CA 1091498

ABSTRACT Fast-response photochromic boro-silicate glasses which have silver halide crystals dispersed throughout the glass and are free from barium, comprise, in weight percentages: Image where R20 represents one or more of Li20, Na20 and K20 in amounts within the ranges 0 to 3% Li20 0 to 8% Na20 and O to 16% K20, and where the content of silver, expressed as Ag20, lies within the range 0.05 to 0.4% by weight, while the content of halide lies within the range 0.13 to 1% by weight of the glass. Further optional constituents are MgO (up to 2.6%) and P205 (up to 12%). Refractive index nD can be corrected to the standard ophthalmic value of 1.523 by additions of ZrO2, TiO2 and/or PbO.

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