Process for the preparation of aqueous suspensions of anionic colloidal silica having a neutral pH and applications thereof

US7629391B2 · kind B2 · utility

Assignee

• AZ Electronic Materials USA Corp. · US

Inventors

• Eric Jacquinot · Compiègne, FR
• Marie-Laure Perard · Compiègne, FR
• Uwe Falk · Könnern, DE
• Torsten Henning · Bad Soden, DE

Key dates

• Filing date: Jan 8, 2002
• Grant date: Dec 8, 2009
• Expiry date: Jan 30, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C12H1/0408
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The instant invention relates to a process for the preparation of an aqueous suspension of anionic colloidal silica having a neutral pH which is stable over time and comprises individualized particles of colloidal silica which are not bound to one another by siloxane bonds. The instant suspensions show high storage stability and are particularly useful for the clarification of beer, for the preparation of cosmetic formulations, for the production of ink for printers, for paints and for anticorrosive treatments.