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US 6,333,285 B1Granted
Glass composition and chemically tempered glass substrate
AssigneeSaint-Gobain Vitrage
InventorsMarie-Hélène Chopinet, Elisabeth Rouyer, Olivier Gaume
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Abstract
The subject of the invention is a glass composition intended to be converted into glass ribbon, comprising the constituents below in the following proportions by weight: SiO2 55-71% Al2O3 >2% MgO 4-11%, and > 8% if Al2O3 < 5% Na2O 9-16.5% K2O 4-10%.
Claims14
Glass composition intended to be converted into glass ribbon, comprising the following constituents in the following proportions by weight:
- SiO2 55-71% Al2O3 greater than 2, but less than 10% MgO 4-11%, and 8-11% if Al2O3 < 5% Na2O 9-16.5% K2O 4-10% B2O3 <2%;
- wherein the ratio of percentage by weight of Na2O/K2O is less than 1.8.
Process for obtaining a glass substrate comprised of a composition having the following constituents in the following proportions by weight:
- SiO2 55-71% Al2O3 greater than 2, but less than 10% MgO 4-11%, and 8-11% if Al2O3 < 5% Na2O 9-16.5% K2O 4-10% B2O3 <2%;
- wherein the ratio of percentage by weight of Na2O/K2O is less than 1.8;
- and the process including forming the substrate.
Dependencies are inferred from the claim text.