公开(公告)号：US20220009830A1

公开(公告)日：2022-01-13

申请号：US17487421

申请日：2021-09-28

Applicant: AGC INC.

Inventor： Izuru KASHIMA ,  Kaname SEKIYA ,  Akio SHIZUKAI ,  Yositeru IKEDA ,  Shogo SUEDA

IPC: C03C21/00 ,  C03C3/087 ,  C03C3/093 ,  C03C3/095 ,  C03C3/097

Abstract: The present invention relates to a method for producing a chemically strengthened glass, the method including, performing a chemical strengthening treatment including the following steps (1) to (3) to a glass having a specific composition, (1) a step of bringing the glass into contact with an inorganic salt composition including 70 mass % or more of potassium nitrate to perform ion exchange; (2) a step of bringing the glass having been ion-exchanged in step (1) into contact with an inorganic salt composition including 50 mass % or more of sodium nitrate to perform ion exchange; and (3) a step of bringing the glass having been ion-exchanged in step (2) into contact with an inorganic salt composition including 70 mass % or more of potassium nitrate to perform ion exchange.