X-ray opaque barium-free glasses and uses thereof

US8168693B2 · 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: Feb 11, 2011
• Grant date: May 1, 2012
• Expiry date: Feb 11, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C14/10
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Zirconium-containing BaO- and PbO-free X-ray opaque glasses having a refractive index nd of about 1.54 to about 1.58 and a high X-ray opacity with an aluminum equivalent thickness of at least about 500% are provided. Such glasses are based on a SiO2—B2O3—Al2O3—R2O—RO—La2O3—ZrO2 system with optional additions of SnO2. Such glasses may be used, in particular, as dental glasses or as optical glasses.