X-ray opaque barium-free glasses and uses thereof

US8178595B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Simone Monika Ritter · Mainz, DE
• Oliver Hochrein · Mainz, DE
• Sabine Pichler-Wilhelm · Landshut, DE

Key dates

• Filing date: Jan 28, 2010
• Grant date: May 15, 2012
• Expiry date: Aug 7, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C8/02
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Zirconium-containing BaO- and PbO-free X-ray opaque glasses having a refractive index nd of about 1.480 to about 1.517 and a high X-ray opacity with an aluminum equivalent thickness of at least about 180% are provided. Such glasses are based on a SiO2—B2O3—Cs2O—K2O—La2O3 system with additions of Al2O3, Li2O, Na2O and/or ZrO2. Such glasses may be used, in particular, as dental glasses or as optical glasses.