Dispersion comprising silicon/titanium mixed oxide powder, and green bodies and shaped glass articles produced therefrom

US6849114B2 · kind B2 · utility

Assignee

• Degussa AG · DE

Inventors

• Monika Oswald · Hanau, DE
• Klaus Deller · Großkrotzenburg, DE
• Helmut Mangold · Rodenbach, DE
• Gerrit Schneider · Hanau, DE
• Rolf Clasen · Saarburg, DE
• Markus Hornfeck · Blieskastel, DE

Key dates

• Filing date: Feb 25, 2003
• Grant date: Feb 1, 2005
• Expiry date: Apr 16, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S501/90
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Aqueous dispersion comprising silicon/titanium mixed oxide powder with a BET surface area of 5 to 500 m2/g which has been prepared by flame hydrolysis and has a titanium dioxide content of 0.5 to 20 wt. %, based on the powder, water and at least one pH-regulating substance which can be removed completely from the reaction mixture on heating, the aqueous dispersion having a solids content of between 40 and 80 wt. %. A green body produced therefrom with a green density of between 40 and 85%. A shaped glass article of optical quality with a coefficient of thermal expansion of not more than 0.5×10−6/K produced from the green body.