Ultraviolet absorbing glasses

Details Ultraviolet absorbing glasses Ultraviolet absorbing glasses

1992-11-25

1994-01-25

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 65, 501 66, 501 67, 501 69, 501 77, 501905, C03C 408, C03C 3064, C03C 3089

Patent

active

052815625

ABSTRACT:
A non-photochromic R.sub.2 O--B.sub.2 O.sub.3 --SiO.sub.2 glass containing a cuprous or cuprous-cadmium halide crystal phase, having a sharp spectral cutoff at about 400 nm, the glass composition consisting essentially of, in cation percent, 35-73% SiO.sub.2, 15-45% B.sub.2 O.sub.3, 0-12% Al.sub.2 O.sub.3, the Al.sub.2 O.sub.3 being less than 10% when the SiO.sub.2 is over 55%, 0-12% Li.sub.2 O, O-20% Na.sub.2 O, 0-12% K.sub.2 O, the Li.sub.2 O+Na.sub.2 O+K.sub.2 O being 4.75-20%, 0-5% CaO+BaO+SrO, 0.125-1.0% Cu.sub.2 O, 0-1% CdO, 0-5% ZrO.sub.2, 0-0.75% SnO.sub.2, 0-1% As.sub.2 O.sub.3 and/or Sb.sub.2 O.sub.3, the glass containing 0-1.75% Cl, 0-1.0% Br, 0.25-2.0% Cl+Br and 0-2% F by weight, and having an R-value, calculated in mole percent of 0.15-0.45, the R-value not exceeding 0.30, except as the glass composition meets at least one condition selected from the group: up to 12 cation % Li.sub.2 O, less than 10 cation % Al.sub.2 O.sub.3, at least 0.3 cation % Cu.sub.2 O and 0.50-2.0% Cl+Br.
Also, a method of making the non-photochromic glass having a sharp spectral cutoff.

REFERENCES:
patent: 3325299 (1967-06-01), Araujo
patent: 4166745 (1979-09-01), Araujo et al.
patent: 4222781 (1980-09-01), Morse et al.
patent: 4550087 (1985-10-01), Kerko et al.
patent: 4980318 (1990-12-01), Araujo
patent: 5024974 (1991-06-01), Nakamura et al.
patent: 5145805 (1992-09-01), Tarumi et al.

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