Alkali-free aluminoborosilicate glass and its use

US5908703A · kind A · utility

Assignee

• Schott Glaswerke · DE

Inventors

• Peter Brix · Mainz, DE
• Ludwig Gaschler · Mainz, DE
• Thomas Kloss · Jena, DE
• Gerhard Lautenschlager · Reinheim, DE
• Klaus Schneider · Zell am Harmersbach, DE

Key dates

• Filing date: Apr 29, 1997
• Grant date: Jun 1, 1999
• Expiry date: Apr 29, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Described is an alkali-free aluminoborosilicate glass with a viscosity of 10.sup.13 dPas at a temperature of above 700.degree.0 C., a processing temperature V.sub.A of less than 1220.degree.0 C., and very good chemical stability, which can be produced in a float unit and has the following composition, in % by weight based on oxide: ______________________________________ SiO.sub.2 48 -- <55 B.sub.2 O.sub.3 7 -- 15 Al.sub.2 O.sub.3 >20 -- 26 MgO 0 -- 8 CaO 4 -- 12 BaO 0 -- 2 SrO 0 -- 2 ZnO 1 -- 8 ZrO.sub.2 0 -- 2 SnO.sub.2 0.5 -- 2 ______________________________________ The glass is especially suitable for use in display technology.