Hydrophilic precipitated silica for defoamer formulations

US8007751B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Christian Panz · Wesseling, DE
• Rene Allerdisse · Bornheim, DE
• Helga Obladen · Zeven, DE
• Mario Loebbus · Aschaffenburg, DE
• Anja Lukas · Hanau, DE
• Roland Bergmann · Großkrotzenburg, DE
• Karl Meier · Bornheim, DE

Key dates

• Filing date: Jan 19, 2005
• Grant date: Aug 30, 2011
• Expiry date: Dec 25, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/19
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Precipitated silicas with a high pH and their use in applications as defoamers having optimum silanol group density and a process for preparing precipitated silicas and to their use, particularly in defoamer formulations.