X-ray opaque barium-free glasses and uses thereof

US8268739B2 · 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: Sep 18, 2012
• Expiry date: Sep 12, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C4/087
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Zirconium-containing BaO- and PbO-free X-ray opaque glasses having a refractive index nd of about 1.57 to about 1.61 and a high X-ray opacity with an aluminum equivalent thickness of at least about 400% are provided. Such glasses are based on a SiO2—Al2O3—La2O3—ZrO2—Cs2O system with additions of Li2O, Na2O, ZnO and/or Ta2O5. Such glasses may be used, in particular, as dental glasses or as optical glasses.