Pyrogenically prepared silicon dioxide

US6679945B2 · kind B2 · utility

Assignee

• Degussa AG · DE

Inventors

• Monika Oswald · Hanau, DE
• Gerrit Schneider · Hanau, DE
• Klaus Deller · Großkrotzenburg, DE

Key dates

• Filing date: Aug 17, 2001
• Grant date: Jan 20, 2004
• Expiry date: Nov 4, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S65/901
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Pyrogenically prepared silicon dioxide with the following physicochemical properties:1. Average particle size (D50 value)D50≧150 nm (dynamic light scattering, 30 wt %)2. Viscosity (5 rpm, 30 wt %) &eegr;≦100 m·Pas3. Thixotropy of Ti (&eegr;(5 rpm))/(&eegr;(50 rpm))≦24. BET surface area 30-60 m2/g5. Compacted bulk=100-160 g/L6. Original pH≦4.5can be used for the preparation of dispersions and glass bodies.