Glass with preferably increased storable tensile stress, chemically toughened glass article with preferably increased storable tensile stress, method for producing such glass, and use thereof

US11339082B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Rüdiger Dietrich · Jena, DE
• Jochen Alkemper · Klein-Winternheim, DE
• Oliver Hochrein · Mainz, DE
• Susanne Krüger · Mainz, DE
• Julia Weißhuhn · Mainz, DE

Key dates

• Filing date: Oct 8, 2019
• Grant date: May 24, 2022
• Expiry date: May 18, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2203/50
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Chemically toughened glass is provided that has a depth of compressive stress for potassium of at least 4 μm and at most 8 μm; a compressive stress at a depth of 30 μm due to sodium exchange of at most 200 MPa and a minimum amount of at least 90 MPa where the thickness is 0.5 mm, at least 100 MPa where the thickness is 0.55 mm, at least 110 MPa in where the thickness is 0.6 mm, at least 120 MPa where the thickness is 0.7 mm, and at least 140 MPa where the thickness is 1 mm; a ratio of sodium exchange depth, in μm, to the thickness, in mm, that is greater than 0.130; and a normalized integral of tensile stress that is a storable tensile stress of at least 20.6 MPa and at most 30 MPa.