UV-radiation absorbing glass with reduced absorption of visible light and methods of making and using same

US7375043B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Joerg Fechner · Mainz, DE
• Andreas Reisse · Regensburg, DE
• Franz Ott · Mitterteich, DE
• Brigitte Hueber · Schwandorf, DE

Key dates

• Filing date: Jun 4, 2004
• Grant date: May 20, 2008
• Expiry date: Apr 19, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C4/085
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The method for making UV-absorbing glass, which transmits in a visible range, includes melting raw materials to form a melt and producing the melt under oxidative conditions. The UV-absorbing glass is free of PbO and has the following composition (in % by weight): SiO2, 55-79; B2O3, 3-25; Al2O3, 0-10; Li2O, 0-10; Na2O, 0-10; K2O, 0-10; MgO, 0-2; CaO, 0-3; SrO, 0-3; BaO, 0-3; ZnO, 0-3; ZrO2, 0-3; CeO2, 0-1; Fe2O3, 0-1; WO3, 0-3; Bi2O3, 0-3; MoO3, 0-3; with Σ Li2O+Na2O+K2O=0.5 to 16 and Σ MgO+CaO+SrO+BaO+ZnO=0-10. The melt composition is characterized by including 0.1 to 10 % TiO2 and from 0.01-10 % As2O3. The glass made by the method and its properties are also disclosed. The glass is useful in lamps, LCD displays, monitors and glass-to-metal seals with molybdenum, tungsten and Fe—Co—Ni alloys.