Alkali-free glass panel
AssigneeNippon Electric Glass Co., Ltd.
InventorMayu Nishimiya
Life of this patent
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Abstract
The present invention provides an alkali-free glass sheet, including as a glass composition, in terms of mol %, 64% to 71% of SiO2, 12.5% to 17% of Al2O3, 0% to 4% of B2O3, 0% to 0.5% of Li2O+Na2O+K2O, 6% to 11% of MgO, 3% to 11% of CaO, 0% to 6% of SrO, 0% to 1% of BaO, and 14% to 19% of MgO+CaO+SrO+BaO, and having a mole percent ratio (Al2O3/CaO)×{B2O3/(MgO+CaO+SrO+BaO)} of from 0 to 0.5, a mole percent ratio MgO/(CaO+SrO) of from 0.5 to 1.5, a mole percent ratio (MgO+CaO+SrO+BaO—Al2O3)×B2O3 of from 1 to 10, and a mole percent ratio SiO2×CaO/MgO of from 30 to 90.
Claims7
An alkali-free glass sheet, comprising as a glass composition, in terms of mol %, 64% to 71% of SiO2, 12.5% to 17% of Al2O3, 0.7% to 4% of B2O3, 0% to 0.5% of Li2O+Na2O+K2O, 6% to 11% of MgO, 3% to 11% of CaO, 0% to 6% of SrO, 0% to 1% of BaO, 0.001% to 1% of SnO2, and 14% to 19% of MgO+CaO+SrO+BaO, having a mole percent ratio (Al2O3/CaO)×{B2O3/(MgO+CaO+SrO+BaO)} of from 0 to 0.5, a mole percent ratio MgO/(CaO+SrO) of from 0.5 to 1.5, a mole percent ratio (MgO+CaO+SrO+BaO—Al2O3)×B2O3 of from 1 to 10, and a mole percent ratio SiO2×CaO/MgO of from 30 to 90, having a strain point of 740° C. or more, and having a liquidus temperature of 1270° C. or less.
Dependencies are inferred from the claim text.