Contrast enhancement in glass
AssigneeSchott Glass Technologies, Inc.
InventorsSally Pucilowski, David G. Krashkevich, Ronald A. Klimek
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Abstract
A colored, chemstrengthenable contrast enhancement, UV attenuated glass (e.g., for sunglasses) comprises, in weight percent, ______________________________________ Oxide Wt. % ______________________________________ SiO.sub.2 40-72 B.sub.2 O.sub.3 0-13 Al.sub.2 O.sub.3 0.5-3 Li.sub.2 O 0-3 Na.sub.2 O 8-13 K.sub.2 O 1-10 TiO.sub.2 8.0-9.5 CeO.sub.2 2.6-3.5 Nd.sub.2 O.sub.3 5-17 Fe.sub.2 O.sub.3 1.40-2.10 CoO 0-0.07 NiO 0-0.4 CuO 0-0.5 Er.sub.2 O.sub.3 0-2 V.sub.2 O.sub.5 0-0.5 Cr.sub.2 O.sub.3 0-0.25 ______________________________________ and has the following properties % T (2.0 mm) 400 nm: .ltoreq.2.2% % T (2.0 mm) 380 nm: 0.0% a: -1.0 to -7.5 b: +1.0 to +10.0.
Claims20
A glass composition consisting essentially of
- ______________________________________ Oxide Wt. % ______________________________________ SiO.sub.2 40-72 B.sub.2 O.sub.3 0-13 Al.sub.2 O.sub.3 0.5-3 Li.sub.2 O 0-3 Na.sub.2 O 8-13 K.sub.2 O 1-10 TiO.sub.2 8.0-9.5 CeO.sub.2 2.6-3.5 Nd.sub.2 O.sub.3 5-17 Fe.sub.2 O.sub.3 1.40-2.10 CoO 0-0.07 NiO 0-0.4 CuO 0-0.5 Er.sub.2 O.sub.3 0-2 V.sub.2 O.sub.5 0-0.5 Cr.sub.2 O.sub.3 0-0.25 ______________________________________
- and having the following properties
- % T (2.0 mm) 400 nm:
- .ltoreq.2.2%
- % T (2.0 mm) 380 nm:
- 0.0%, and
- a:
- -1.0 to -7.5
- b:
- +1.0 to +10.0.
A glass composition consisting essentially of
- ______________________________________ Oxide Wt. % ______________________________________ SiO.sub.2 40-72 B.sub.2 O.sub.3 0-13 Al.sub.2 O.sub.3 0.5-3 Li.sub.2 O 0-3 Na.sub.2 O 8-13 K.sub.2 O 1-10 TiO.sub.2 8.0-9.5 CeO.sub.2 2.6-3.5 Nd.sub.2 O.sub.3 5-17 Fe.sub.2 O.sub.3 1.40-2.10 CoO 0-0.07 NiO 0-0.4 CuO 0-0.5 Er.sub.2 O.sub.3 0-2 V.sub.2 O.sub.5 0-0.5 Cr.sub.2 O.sub.3 0-0.25 ______________________________________
- and having the following properties
- % T (2.0 mm) 400 nm:
- .ltoreq.2.2%
- % T (2.0 mm) 380 nm:
- 0.0%, and
- a:
- -1.0 to -7.5
- b:
- +1.0 to +10.0
- with the proviso that said glass composition is not of the following approximate composition:
- ______________________________________ SiO.sub.2 57.8 B.sub.2 O.sub.3 1.5 Al.sub.2 O.sub.3 1.3 Li.sub.2 O 2.4 Na.sub.2 O 9.7 K.sub.2 O 2.4 TiO.sub.2 8.5 CeO.sub.2 2.8 Nd.sub.2 O.sub.3 12.1 Fe.sub.2 O.sub.3 1.6 CoO 0.04 NiO 0.04 CuO 0.04 ______________________________________
- as melted in the presence of about 2 wt. % KHF.sub.2 refining agent.
Dependencies are inferred from the claim text.