Alkali-free glass and alkali-free glass substrate
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United States of America Patent
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Jun 4, 2013
Grant Date -
Oct 29, 2009
app pub date -
Jun 26, 2009
filing date -
Jun 8, 2007
priority date (Note) -
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Abstract
An alkali-free glass characterized by having a glass composition being substantially free of an alkali metal oxide, As2O3 and Sb2O3 and including, in terms of mol %, 55 to 75% of SiO2, 7 to 15% of Al2O3, 7 to 12% of B2O3, 0 to 3% of MgO, 7 to 12% of CaO, 0 to 5% of SrO, 0 to 2% of BaO, 0 to 5% of ZnO and 0.01 to 1% of SnO2 and has a liquidus viscosity of 105.2 dPa·s or higher and a temperature corresponding to a viscosity of 102.5 dPa·s of 1,550° C. or lower.
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