Method for producing chemically strengthened glass

Abstract

The present invention relates to a method for producing a chemically strengthened glass, the method including the following steps (1) to (3) in this order: (1) a glass sheet preparation step of preparing a glass sheet having, in a surface layer thereof, a compressive stress layer; (2) a first ion exchange step of bringing the glass sheet into contact with an inorganic salt composition to perform ion exchange of at least one pair of ions so as to decrease a compressive stress value of the compressive stress layer; and (3) a second ion exchange step of bringing the glass sheet into contact with an inorganic salt composition to perform ion exchange of at least one pair of ions so as to increase the compressive stress value of the compressive stress layer in the surface layer.

Dependencies are inferred from the claim text.