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US 9,809,486 B2Granted
Tempered glass and glass
AssigneeNippon Electric Glass Co., Ltd.
InventorTakashi Murata
Life of this patent
Estimating the term…
Abstract
A tempered glass of the present invention includes, as a glass composition, in terms of mass %, 45 to 75% of SiO2, 0 to 30% of Al2O3, and 0 to 30% of Li2O+Na2O+K2O and has a β-OH value of 0.3 to 1/mm.
Claims21
A method for producing a tempered glass comprising the steps of:
- preparing a glass batch so that a glass for tempering comprises, as a glass composition, in terms of mass %, 45 to 57.5% of SiO2, 22 to 30% of Al2O3, 0 to 3% of CaO, 8 to 30% of Li2O+Na2O+K2O, 0 to 0.1% of Li2O, 8 to 20% of Na2O, less than 0.1% of As2O3, and less than 0.1% of Sb2O3, wherein the glass batch comprises a hydroxide raw material;
- melting the glass batch to obtain a molten glass,
- forming the molten glass into a glass for tempering having a β-OH value of 0.3 to 1/mm;
- and
- subjecting the glass for tempering to an ion-exchange treatment to form a compression stress layer on a surface of the glass for tempering.
2 more elements
A method for producing a glass for tempering comprising the steps of:
- preparing a glass batch so that the glass for tempering comprises, as a glass composition, in terms of mass %, 45 to 57.5% of SiO2, 22 to 30% of Al2O3, 0 to 3% of CaO, 8 to 30% of Li2O+Na2O+K2O, 0 to 0.1% of Li2O, 8 to 20% of Na2O, less than 0.1% of As2O3, and less than 0.1% of Sb2O3, wherein the glass batch comprises a hydroxide raw material;
- melting the glass batch to obtain a molten glass,
- forming the molten glass into the glass for tempering having a β-OH value of 0.3 to 1/mm.
Dependencies are inferred from the claim text.