Silicate glasses having low seed concentration
First Claim
1. A silicate glass having a seed concentration of less than 1 seed/cm3, wherein the silicate glass comprises:
- 60-70 mol % SiO2;
6-14 mol Al2O3;
0-3 mol % B2O3;
0-1 mol % Li2O;
8-18 mol % Na2O;
0-5 mol % K2O;
0-2.5 mol % CaO;
above 0 to 3 mol % ZrO2;
0-1 mol % SnO2; and
0-1 mol % CeO2, wherein12 mol %<
Li2O+Na2O+K2O≤
20 mol %,the silicate glass comprises less than 50 ppm As2O3, andthe silicate glass is free of halides.
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Abstract
A fining agent for reducing the concentration of seeds or bubbles in a silicate glass. The fining agent includes at least one inorganic compound, such as a hydrate or a hydroxide that acts as a source of water. In one embodiment, the fining agent further includes at least one multivalent metal oxide and, optionally, an oxidizer. A fusion formable and ion exchangeable silicate glass having a seed concentration of less than about 1 seed/cm3 is also provided. Methods of reducing the seed concentration of a silicate glass, and a method of making a silicate glass having a seed concentration of less than about 1 seed/cm3 are also described.
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Citations
30 Claims
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1. A silicate glass having a seed concentration of less than 1 seed/cm3, wherein the silicate glass comprises:
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60-70 mol % SiO2; 6-14 mol Al2O3; 0-3 mol % B2O3; 0-1 mol % Li2O; 8-18 mol % Na2O; 0-5 mol % K2O; 0-2.5 mol % CaO; above 0 to 3 mol % ZrO2; 0-1 mol % SnO2; and 0-1 mol % CeO2, wherein 12 mol %<
Li2O+Na2O+K2O≤
20 mol %,the silicate glass comprises less than 50 ppm As2O3, and the silicate glass is free of halides. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A silicate glass having a seed concentration of less than 1 seed/cm3, wherein the silicate glass comprises:
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60-70 mol % SiO2; 0-3 mol % B2O3; 0-1 mol % Li2O; 8-18 mol % Na2O; 0-5 mol % K2O; 0-2.5 mol % CaO; above 0 to 3% mol ZrO2; 0-1 mol % CeO2; and Al2O3, wherein 12 mol %<
Li2O+Na2O+K2O≤
20 mol %,the silicate glass is substantially free of As2O3, the silicate glass is free of halides, and the silicate glass is free of SnO2. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A silicate glass having a seed concentration of less than 1 seed/cm3, wherein the silicate glass comprises:
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60-70 mol % SiO2; 6-14 mol % Al2O3; 0-3 mol % B2O3; 1-7 mol % MgO; 0-5 mol % Li2O; 8-18 mol % Na2O; 0-5 mol % K2O; 0-2.5 mol % CaO; above 0 to 3% mol ZrO2; 0-1 mol % SnO2; and 0-1 mol % CeO2, wherein 12 mol %<
Li2O+Na2O+K2O≤
20 mol %,the silicate glass comprises less than 50 ppm As2O3, and the silicate glass is free of halides. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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Specification