Process for the production and concentration of silica sols

US5458812A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Uwe Brekau · Cologne, DE
• Andreas Nickel · Winsen (Aller), DE
• Hans-Dieter Block · Cologne, DE
• Hans-Heinrich Moretto · Cologne, DE
• Peter C. Schmidt · Leverkusen, DE
• Peter Schober · Leverkusen, DE
• Werner Ludovici · Odenthal, DE

Key dates

• Filing date: May 10, 1993
• Grant date: Oct 17, 1995
• Expiry date: May 10, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S516/929
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Process for the production and concentration of alkaline silica sols containing nonaggregated, spherical SiO.sub.2 particles with a diameter of .gtoreq.1 nm starting with SiO.sub.2 concentrations of 4-8% by weight, using microporous membrane filters.