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US 11,161,770 B2Granted
Glass
AssigneeNippon Electric Glass Co., Ltd.
InventorAtsuki Saito
Life of this patent
Estimating the term…
Abstract
An alkali-free glass of the present invention includes as a glass composition, in terms of mass %, 55% to 70% of SiO2, 15% to 25% of Al2O3, 0% to 1% of B2O3, 0% to 0.5% of Li2O+Na2O+K2O, 2% to 6% of MgO, 2% to 8% of CaO, 0% to 4% of SrO, and 6% to 12% of BaO, and has a strain point of more than 720° C.
Claims12
A glass, comprising as a glass composition, in terms of mass %, 55% to 61.60% of SiO2, 15% to 25% of Al2O3, 0% to 1% of B2O3, 0% to 0.5% of Li2O+Na2O+K2O, 2% to 6% of MgO, 2% to 8% of CaO, 0% to 4% of SrO, and 6% to 12% of BaO, and having a strain point of more than 720° C.,
- wherein the glass has a ratio of SiO2/Al2O3 in terms of mass % of 3.6 or less, and
- wherein the glass has a temperature at a viscosity of 102.5 dPa·s of 1,695° C. or less.
Dependencies are inferred from the claim text.