Method for the production of defoamer formulations

US7776929B2 · kind B2 · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Otto Schneider · Burghausen, DE
• Willibald Burger · Burghausen, DE
• Holger Rautschek · Großenhain, DE

Key dates

• Filing date: Feb 9, 2006
• Grant date: Aug 17, 2010
• Expiry date: Apr 3, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/20
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Defoamer compositions which exhibit both high defoaming activity as well as good storage stability are prepared by mixing at least an organopolysiloxane having a defined but limited fraction of silicon-bonded hydroxyl and/or alkoxy groups and hydrophilic silica, followed by heating until the viscosity of the mixture has fallen to less than 50% of its value prior to heating.