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

US6525103B2 · kind B2 · utility

Assignee

• Goldschmift 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: Feb 19, 2002
• Grant date: Feb 25, 2003
• Expiry date: Feb 19, 2022

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 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.