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UV absorbing gray glass composition
 
   
Document Number
US Patent 7560404
Issued Date
July 14, 2009
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Abstract
A novel glass composition is disclosed. The glass composition includes a base glass composition made up of SiO.sub.2 from 65 to 75 weight percent, Na.sub.2O from 10 to 20 weight percent, CaO from 5 to 15 weight percent, MgO from 0 to 5 weight percent, Al.sub.2O.sub.3 from 0 to 5 weight percent, K.sub.2O from 0 to 5 weight percent, B.sub.2O.sub.3 0 to 5%, and MnO.sub.2 0 to 0.5%, and a colorant and property modifying material portion made up of total iron up to 0.65 weight percent, Se ranging from 2 PPM to 10 PPM, at least one UV absorber selected from CeO.sub.2, V.sub.2O.sub.5, TiO.sub.2 and MoO.sub.3, CoO up to 20 PPM, and Cr.sub.2O.sub.3 up to 75 PPM, wherein the glass composition has a redox ratio ranging from 0.2 to 0.6.
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Number of Claims:
20
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Published
July 14, 2009
Application Number
11/222,406
Filed
September 8, 2005
US Classification
501/70   501/64 501/71
Int'l Classification
C03C   3/087   (20060101)   C03C   3/095   (20060101)  
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USPTO Field of Search
501/70   501/71   501/64  
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