Use of water-insoluble poly(oxy-1,4-butanediyl)-containing polyoxyalkylene-polysiloxane block copolymers for defoaming aqueous media

US6451863B1 · kind B1 · utility

Assignee

• Golschmidt AG · DE

Inventors

• Thomas Ebbrecht · Bochum, DE
• Wolfgang Josten · Essen, DE
• Michael Keup · Essen, DE
• Stefan Silber · Krefeld, DE
• Roland Sucker · Werne, DE

Key dates

• Filing date: May 11, 2000
• Grant date: Sep 17, 2002
• Expiry date: May 11, 2020

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D19/04
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to the use of water-insoluble poly(oxy-1,4-butanediyl)-containing polyoxyalkylene-polysiloxane block copolymers of the general average formula wherein the variables and indices are described herein as defoaming agents for aqueous media. This invention also provides for defoaming compositions comprising said Water-insoluble poly(oxy-1,4-butanediyl)-containing polyoxyalkylene-polysiloxane block copolymers.