Method of manufacturing chemically strengthened glass plate

Abstract

[Subject] An object of the present invention is to provide a method for manufacturing a chemically strengthened glass plate having a high surface compressive stress with high efficiency using a soda-lime glass, the composition of which is not particularly suited for chemical strengthening. [Solution] The present invention provides a method of manufacturing a chemically strengthened glass plate by ion-exchanging a glass base plate to replace alkali metal ions A that are the main alkali metal ion component of the glass base plate with alkali metal ions B having a larger ionic radius than the alkali metal ions A at a surface of the glass base plate, the unexchanged glass base plate made of a soda-lime glass, the method including: a first step of contacting the glass base plate with a first salt containing the alkali metal ions A, the first salt containing the alkali metal ions A at a ratio X, as expressed as a molar percentage of total alkali metal ions, of 90 to 100 mol %; a second step of contacting the glass plate with a second salt containing the alkali metal ions B after the first step, the second salt containing the alkali metal ions A at a ratio Y, as expressed as a molar percentage of the total alkali metal ions, of 0 to 10 mol %; and a third step of contacting the glass plate with a third salt containing the alkali metal ions B after the second step, the third salt containing the alkali metal ions B at a ratio Z, as expressed as a molar percentage of the total alkali metal ions, of 98 to 100 mol %.

Dependencies are inferred from the claim text.