Agc Inc.

Kaname Sekiya

Yusuke Fujiwara

Izuru Kashima

Yositeru Ikeda

Shogo Sueda

Akio Shizukai

The present invention relates to a chemically strengthened glass having a thickness t (mm), in which a first-order derivative CS' of a stress value CS(MPa) is −4.7 or larger in a range of CS≥0 in a profile of the stress value CS(MPa), in which the stress value CS(MPa) is a function of depth x (μm) from a glass surface, and in which the stress value CS(MPa) is measured by a scattered light photoelastic stress meter, and a manufacturing method thereof.

Chemically strengthened glass and manufacturing method thereof

The present invention relates to a chemically strengthened glass having a thickness t (mm), in which a first-order derivative CS' of a stress value CS(MPa) is −4.7 or larger in a range of CS≥0 in a profile of the stress value CS(MPa), in which the stress value CS(MPa) is a function of depth×(μm) from a glass surface, and in which the stress value CS(MPa) is measured by a scattered light photoelastic stress meter, and a manufacturing method thereof.

The present invention relates to a chemically strengthened glass having a thickness of t [mm], and having a profile of a stress value CS[MPa] at a depth x [&#x3bc;m] from a surface of the glass, the stress value being measured by a scattered-light photoelastic stress meter, in which a second-order differential value CS&#x2033; of the stress value CSin the profile satisfies the following expression within a range of CS&#x2265;0: 0&#x3c;CS&#x2033;&#x2264;0.050.

Chemically strengthened glass, and method for manufacturing the same

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.

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Tokyo, Japan

Kaname Sekiya