Method for making thermally tempered glass comprising a non-abrasive, porous, SiO2 antireflection layer

US7128944B2 · kind B2 · utility

Assignee

• Flabeg Solarglas GmbH & Co. KG · DE

Inventors

• Hans-Joachim Becker · Markt Erlbach, DE
• Armin Dauwalter · Ergolding, DE
• Andreas Gombert · Glückstadt, DE
• Walther Glaubitt · Würzburg, DE
• Thomas Hofmann · San Diego, US
• Monika Kursawe · Seeheim-Jugenheim, DE

Key dates

• Filing date: Oct 17, 2001
• Grant date: Oct 31, 2006
• Expiry date: May 4, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2218/113
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to thermally tempered safety glass comprising an non-abrasive and porous SiO2 layer which is stable during sintering and has a refractive index of between 1.25 and 1.40. The inventive safety glass can be obtained by coating standard soda-lime glass with an aqueous coating solution having a pH value of between 3 and 8 and containing between 0.5 and 5.0 wt. % of [SiOx(OH)y]n particles (0<y<4 and 0<x<2) having a particle size of between 10 and 60 nm, and a surfactant mixture. The coated glass is then dried, thermally hardened at temperatures of at least 600° C. for several minutes, and thermally tempered by a flow of air.