Glass having excellent resistance against surface damages and method for the production thereof

US8859079B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Friedrich Siebers · Nierstein, DE
• Bernd Ruedinger · Wörrstadt, DE
• Andreas Langsdorf · Ingelheim am Rhein, DE
• Markus M. Heiss · Cologne, DE

Key dates

• Filing date: Jul 8, 2011
• Grant date: Oct 14, 2014
• Expiry date: Nov 12, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24372
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A glass having excellent resistance against surface damages is provided. The glass includes a content of alkaline earth oxides of at least 0.3% by weight and of P2O5 of 0.1 to 4% by weight; the glass has at least one surface that has precipitations with a mean size of 1 to 20 μm. A method is further provided and includes melting a glass batch, yielding a glass melt, and casting the glass melt onto a float bath. The glass melt is maintained on the float bath at a temperature of above 1000° C. for at least 5 minutes, and yields glass. The glass has a content of alkaline earth oxides of at least 0.3% by weight and of P2O5 of 0.1 to 4% by weight, and the glass has at least one surface that has precipitations with a mean size of 1 to 20 μm.