Solarization-stable ultraviolet filter glasses for the 280 - 500 nm transmission range
AssigneeSchott Glaswerke
InventorBurkhard Speit
Life of this patent
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Abstract
Alkali silicate glasses, pigmented with Co.sup.2+ or with Co.sup.2+ and Ni.sup.2+, and having the composition: ______________________________________ SiO.sub.2 52-71% by weight PbO 2.9-16.8% by weight SnO.sub.2 0.1-1.65% by weight Na.sub.2 O 6.7-16.7% by weight K.sub.2 O 0.5-9.9% by weight Na.sub.2 O + K.sub.2 O 13.3-18.3% by weight NiO + CoO 0.1-4.4% by weight As.sub.2 O.sub.3 + Sb.sub.2 O.sub.3 0.05-0.5% by weight .SIGMA.RO 0-8.6% by weight B.sub.2 O.sub.3 0-8.5% by weight Al.sub.2 O.sub.3 0-0.55% by weight ZnO 0-10.5% by weight, ______________________________________ in which R is Mg, Ca, Sr, Ba or a combination thereof, are disclosed. The alkali silicate glasses of the invention are useful as optical filter glasses.
Claims1
An alkali silicate solarization-stable ultraviolet glass, transmitting in the 280-500 nm range, for use as an optical filter glass, said alkali silicate glass being colored with a member selected from the group consisting of Co.sup.2+ and (Co.sup.2+ and Ni.sup.2+), consisting essentially of:
- ______________________________________ SiO.sub.2 52-71% by weight PbO 2.9-16.8% by weight SnO.sub.2 0.1-1.65% by weight Na.sub.2 O 6.7-16.7% by weight K.sub.2 O 0.5-9.9% by weight Na.sub.2 O + K.sub.2 O 13.3-18.3% by weight NiO + CoO 0.1-4.4% by weight As.sub.2 O.sub.3 + Sb.sub.2 O.sub.3 0.05-0.5% by weight RO 0-8.6% by weight B.sub.2 O.sub.3 0-8.5% by weight Al.sub.2 O.sub.3 0-0.55% by weight ZnO 0-10.5% by weight ______________________________________
- wherein,
- R is an element selected from the group consisting of Mg, Ca, Sr, Ba and a combination thereof.
Dependencies are inferred from the claim text.