Glass and chemically strengthened glass

Abstract

This glass comprises, in mole percent on an oxide basis, 60-68% of SiO2, 8-12% of Al2O3, 12-20% of Na2O, 0.1-6% of K2O, 6.4-12.5% of MgO, and 0.001-4% of ZrO2, with the total content of B2O3, P2O5, CaO, SrO, and BaO being 0-1%, and the glass satisfies 2*Al2O3 / SiO2<=0.4 and 0<K2O / Na2O<=0.3. This glass is capable of achieving high surface compressive stress by chemical strengthening, is capable of achieving high surface compressive stress even when deteriorated salt is used for chemical strengthening treatment thereof due to suppressed percentage reductions in the surface compressive stress, has a high rate of ionic exchange during chemical strengthening, and has excellent manufacturability.

Description

technical field [0001] The present invention relates to glass and chemically strengthened glass. The glass of the present invention can be applied to chemical strengthening treatment. In addition, the chemically strengthened glass of the present invention can be used, for example, as cover glass and touch-sensitive glass of touch-panel displays included in information devices such as tablet terminals, notebook personal computers, smart phones, and e-book readers, cameras, game machines, portable Cover glass for electronic devices such as music players, cover glass for monitors of LCD TVs and personal computers, cover glass for car dashboards, etc., cover glass for solar cells, and multilayer glass for windows in buildings and houses Wait. Background technique [0002] In recent years, for display devices such as mobile devices, liquid crystal televisions, and touch panels, cover glass (protective glass) for improving the protection and appearance of the display has been in...

AI Technical Summary

Problems solved by technology

However, the glass compositions described in Patent Document 2 are all SiO 2 and Al 2 o 3 The composition with a large total amount, such a glass has a high viscosity value at a high temperature, and the bubble quality when the glass is melted is poor, so there is a problem of poor manufacturability

In addition, in Patent Document 2, it is described that K 2 O is a component that increases the ion exchange rate, but the glass described in Patent Document 2 contains K 2 O glass tends to have a large reduction ratio of the surface compressive stress of the chemically strengthened glass due to an increase in the sodium concentration in the molten salt.

Therefore, when performing chemical strengthening treatment, it is difficult to achieve a balance between high surface compressive stress and high ion exchange rate by suppressing the reduction ratio of surface compressive stress even if degraded salt is used.

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