US2017174551A1PendingUtilityA1

Chemically temperable glass sheet

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Assignee: AGC GLASS EUROPEPriority: Mar 31, 2014Filed: Mar 26, 2015Published: Jun 22, 2017
Est. expiryMar 31, 2034(~7.7 yrs left)· nominal 20-yr term from priority
Inventors:Thomas Lambricht
C03C 21/002C03C 4/18C03C 3/087C03C 2204/00C03C 3/085
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Claims

Abstract

The invention relates to a glass sheet having a boron- and lithium-free glass composition comprising the following in weight percentage, expressed with respect to the total weight of glass: 65≦SiO 2 ≦78% 5≦Na 2 O≦20% 0≦K 2 O<5% 1≦Al 2 O 3 <4% 0≦CaO<4.5% 4<MgO≦12%; as well as a total iron (expressed in the form of Fe 2 O 3 ) in a content ranging from 0.002 to 0.06% by weight and a (CaO/MgO) ratio which is less than 1. The invention corresponds to an easy chemically-temperable soda-silica type glass composition, which is more suited for mass production than aluminosilicate glass, and therefore is available at low cost, and with a base glass/matrix composition that is close to or very similar to compositions already used in existing mass production.

Claims

exact text as granted — not AI-modified
1 . A glass sheet having a boron- and lithium-free glass composition comprising the following in weight percentage, expressed with respect to the total weight of glass:
 65≦SiO 2 ≦78%   5≦Na 2 O≦20%   0≦K 2 O<5%   1≦Al 2 O 3 <4%   0≦CaO<4.5%   4≦MgO≦12% ;   
       as well as a total iron (expressed in the form of Fe 2 O 3 ) in a content ranging from 0.002 to 0.06% by weight and a (CaO/MgO) ratio which is less than 1. 
     
     
         2 . The glass sheet of  claim 1 , comprising:
 1≦Al 2 O 3 ≦3 wt %.   
     
     
         3 . The glass sheet of  claim 2 , comprising:
 2≦Al 2 O 3 ≦3 wt %.   
     
     
         4 . The glass sheet of  claim 1 , comprising:
 0≦CaO<4 wt %.   
     
     
         5 . The glass sheet of  claim 1 , comprising:
 0≦CaO<3.5 wt %.   
     
     
         6 . The glass sheet of  claim 1 , comprising:
 5.5≦MgO≦10 wt %.   
     
     
         7 . The glass sheet of  claim 6 , comprising:
 6≦MgO≦10 wt %.   
     
     
         8 . The glass sheet of  claim 1 , wherein a (CaO/MgO) ratio is less than or equal to 0.45. 
     
     
         9 . The glass sheet of  claim 8 , wherein the (CaO/MgO) ratio is less than or equal to 0.4. 
     
     
         10 . The glass sheet of  claim 9 , wherein the (CaO/MgO) ratio is less than or equal to 0.1. 
     
     
         11 . The glass sheet of  claim 1 , which is chemically tempered. 
     
     
         12 . The glass sheet of  claim 11 , having a surface and a layer under compressive stress extending from the surface to a depth of the layer, wherein the depth of layer is at least 10 microns. 
     
     
         13 . The glass sheet of  claim 11 , wherein the compressive stress is at least 300 MPa. 
     
     
         14 . The glass sheet of  claim 11 , wherein the sheet has a thickness of 0.1 to 2.2 mm. 
     
     
         15 . An electronic device, comprising the glass sheet of  claim 11 .

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