Block polymers containing ester groups as defoamers for aqueous systems

US5710207A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Thomas Möller · Herford, DE
• Ulrich Eicken · Korschenbroich, DE
• Herbert Fischer · Goldkronach, DE
• Horst-Werner Wollenweber · Goldkronach, DE
• Wolfgang Gress · Wuppertal, DE
• Christian De Haut · Saint-Fargeau-Ponthierry, FR
• Ulrike Mahler · Goldkronach, DE
• Manfred Gorzinski · Düsseldorf, DE
• Hans-Jurgen Sladek · Krefeld, DE

Key dates

• Filing date: Apr 10, 1996
• Grant date: Jan 20, 1998
• Expiry date: Apr 10, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2998
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method of using compositions as foam regulators for water-based systems with a tendency to foam is provided. The method employs a block copolymer containing ester groups corresponding to general formula (I): EQU A--(CH.sub.2 CH.sub.2 O).sub.n --B (I) in which n is an integer of 4 to 300, A is an optionally polymeric hydroxycarboxylic acid function and B is hydrogen, an alkyl or alkenyl radical containing 1 to 22 carbon atoms, a phenyl or benzyl radical or has the same meaning as A. Also provided is a granular free-flowing foam regulating formulation which contains 0.5% by weight to 30% by weight of the block copolymer containing ester groups adsorbed onto from 70% by weight to 99.5% by weight of a granular, substantially inorganic phosphate-free support material.