Method for producing antifoam compositions

US9114333B2 · kind B2 · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Willibald Burger · Burghausen, DE
• Holger Rautschek · Großenhain, DE
• Josef Wimmer · Burghausen, DE

Key dates

• Filing date: Dec 17, 2012
• Grant date: Aug 25, 2015
• Expiry date: Dec 17, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L83/04
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Effective and long lasting defoamer compositions are prepared by admixing an organopolysiloxanes, a hydrophilic silica, a hydrophobic silica, optionally an organopolysiloxanes resin, and optionally a water insoluble inorganic compound, at a temperature of 50° C. to 250° C. until the viscosity of the composition has decreased to at least half its original viscosity prior to heating.