Uv blocking for improved transmission glasses

Abstract

Embodiments are directed to glass articles which are resistant to UV photodarkening, the glass articles having a thickness ≤1.3 mm and comprise UV absorbers such as Ti, V, Mn, Fe, Cu, Ce, Ge, Mo, Cr, Co and Ni, and combinations thereof, or alternatively comprising ZnO or SnO2.

1 . A glass article having a thickness ≤1.3 mm, wherein the glass article is substantially free of alkali metals and oxides and comprises
 65-74 mol % SiO 2 ; 
 11-13 mol % Al 2 O 3 ; 
 11-16 mol % RO, wherein RO is one or more of MgO, CaO, SrO, BaO and ZnO; 
 2-11 mol % B 2 O 3 ; 
 above 0 to 1 mol % SnO 2 ; and 
 an inorganic UV absorber, wherein the inorganic UV absorber comprises:
 0.1-1.0 mol % of one or more metal ions or oxides thereof, wherein the metal ions are selected from the group consisting of Ti, V, Mn, Fe, Cu, Ce, Ge, and combinations thereof; 
 above 0 to 500 ppm by wt. of one or more metals or oxides thereof, wherein the metals are selected from the group consisting of Mo, Cr, Co and Ni; or 
 combinations thereof. 
 
 
     
     
         2 . The glass article of  claim 1 , wherein the inorganic UV absorber comprises ≤150 ppm by wt. of one or more metals or oxides thereof, wherein the metals are selected from the group consisting of Mo, Cr, Co and Ni. 
     
     
         3 . The glass article of  claim 1 , wherein the inorganic UV absorber comprises 0.2-1.0 mol % of one or more metal ions or oxides thereof, wherein the metal ions are selected from the group consisting of Ti, V, Mn, Fe, Cu, Ce, Ge, and combinations thereof. 
     
     
         4 . The glass article of  claim 1 , wherein the glass article comprises 0.1-1 mol % SnO 2 . 
     
     
         5 . The glass article of  claim 1 , wherein the glass article has a UV absorbance/mm≥2 at spectrum wavelengths of about 270 nm and an induced absorbance of less than 0.025 for at least one wavelength from 400 to 700 nm. 
     
     
         6 . The glass article of  claim 1 , wherein the thickness of the glass article is 0.1-1.0 mm. 
     
     
         7 . The glass article of  claim 1 , wherein the glass article comprises 0-3 mol % P 2 O 5 . 
     
     
         8 . A glass article having a thickness 1.3 mm, wherein the glass article comprises
 54-75 mol % SiO 2 ;   8-14 mol % Al 2 O 3 ;   0-12 mol % B 2 O 3 ;   0.1-7 mol % P 2 O 5 ;   10-20 mol % R 2 O, wherein R 2 O comprises one or more of Na 2 O, K 2 O, or Li 2 O   3 mol %≤B 2 O 3 +P 2 O 5 ≤15 mol %; and   0.5-10 mol % ZnO.   
     
     
         9 . The glass article of  claim 8 , wherein the glass article comprises 63-75 mol % SiO 2 . 
     
     
         10 . The glass article of  claim 8 , wherein the glass article comprises 1-10 mol % ZnO. 
     
     
         11 . The glass article of  claim 8 , wherein the glass article is defined by an equation: −3.5<R 2 O+RO-Al 2 O 3 <10. 
     
     
         12 . The glass article of  claim 8 , wherein the glass article is a strengthened glass article. 
     
     
         13 . The glass article of  claim 8 , wherein the glass article has an induced absorbance of less than 0.01 for at least one wavelength from 400 to 700 nm. 
     
     
         14 . The glass article of  claim 8 , wherein the glass article comprises 0.05-1 mol % SnO 2 . 
     
     
         15 . The glass article of  claim 8 , wherein the glass article comprises 0.5-17 mol % of RO, wherein RO is one or more of MgO, CaO, SrO, ZnO, and BaO. 
     
     
         16 . The glass article of  claim 8 , wherein the thickness of the glass article is 0.1-1.0 mm. 
     
     
         17 . The glass article of  claim 8 , wherein the glass article comprises 54-65 mol % SiO 2 , 11-17 mol % Al 2 O 3 , 0-8 mol % B 2 O 3 , 0-4 mol % RO, 0.1-7 mol % P 2 O 5 , 13-19 mol % R 2 O, and the sum of Al 2 O 3 +B 2 O 3 +P 2 O 5 >19 mol %. 
     
     
         18 . A glass article having a thickness ≤1.3 mm, wherein the glass article is substantially free of alkali metals and oxides and comprises
 65-74 mol % SiO 2 ; 
 11-13 mol % Al 2 O 3 ; 
 11-16 mol % RO, wherein RO is one or more of MgO, CaO, SrO, BaO and ZnO, and wherein the glass article comprises 0.5-10 mol % ZnO; 
 2-11 mol % B 2 O 3 ; and 
 above 0 to 1 mol % SnO 2 . 
 
     
     
         19 . The glass article of  claim 18 , wherein the glass article comprises 1-10 mol % ZnO. 
     
     
         20 . The glass article of  claim 18 , wherein the glass article has an induced absorbance of less than 0.01 for at least one wavelength from 400 to 700 nm.