Alkali-free glass and alkali-free glass substrate

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 DEG C. or lower.

Description

technical field [0001] The present invention relates to non-alkali glass and non-alkali glass substrates suitable for substrates such as liquid crystal displays and organic EL displays, substrates such as hard disks, filters, and sensors, and cover glasses for solid-state imaging devices such as CMOS. Background technique [0002] Glass substrates are widely used in substrates such as liquid crystal displays and organic EL displays, substrates such as hard disks, filters, and sensors, and cover glasses for solid-state imaging devices such as CMOS. In particular, among liquid crystal displays or organic EL displays, active matrix liquid crystal displays, in which pixels are driven by active elements represented by thin film transistors (hereinafter referred to as TFTs), have become the mainstream, and these are widely used in liquid crystal televisions and notebook computers. , LCD monitors, mobile phones and digital camera monitors and other color display or animation displa...

AI Technical Summary

Problems solved by technology

As and Sb are components used as clarifiers for glass, and are suitable for glasses that require high-temperature melting, such as alkali-free glass, but their use is not preferable from the environmental point of view.

In particular, the toxicity of As is high, so its use tends to be strictly limited.

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