Green glass composition
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United States of America Patent
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Aug 22, 2006
Grant Date -
Apr 8, 2004
app pub date -
Oct 4, 2002
filing date -
Oct 4, 2002
priority date (Note) -
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Abstract
The present invention is a green soda-lime-silica glass composition. The composition comprises 68 to 75% SiO.sub.2, 10 to 18% Na.sub.2O, 5 to 15% CaO, 0 to 10% MgO, 0 to 5% Al.sub.2O.sub.3, and 0 to 5% K.sub.20, where CaO+MgO is 6 to 15% and Na.sub.2O+K.sub.20 is 10 to 20%, and colorants comprising: 0.3 to 0.8 wt. % total iron as Fe.sub.2O.sub.3 wherein the ratio of FeO/total Fe as Fe.sub.2O.sub.3 is 0.35 to 0.62; 0.05 to 0.5 wt. % manganese compound as MnO.sub.2; 0 to 0.1 wt. % titanium oxide as TiO.sub.2; and 0 to 1 wt. % cerium oxide as CeO.sub.2. The colored glass has the following spectral properties at 4.0 mm. thickness: 65 to 81% light transmittance using Illuminant A (LTA) and using Illuminant C has a dominant wavelength of 494 to 555 nanometers with an excitation purity of 2 to 9%.
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