Defoamers for aqueous media

US6420324B1 · kind B1 · utility

Assignee

• GOLDSCHMIDT HOLDING GMBH · DE

Inventors

• Thomas Ebbrecht · Bochum, DE
• Michael Gippert · Essen, DE
• Martina Hartmann · Duisburg, DE
• Wolfgang Josten · Essen, DE
• Peter Muss · Essen, DE
• Stefan Silber · Krefeld, DE
• Roland Sucker · Werne, DE

Key dates

• Filing date: Apr 13, 2000
• Grant date: Jul 16, 2002
• Expiry date: Apr 13, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10M2215/102
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to compositions for defoaming aqueous media, comprising as defoamers urea derivatives of the formula I whereR1 is a hydrocarbon radical, preferably having 4 to 30 carbon atoms or a hydrocarbon radical, preferably having 4 to 24 carbon atoms and one nitrogen atom or a hydrocarbon radical, preferably having 4 to 30 carbon atoms and one carbonyl group,R2 is a hydrogen atom or a hydrocarbon radical, preferably having 1 to 24 carbon atoms,R3 is a hydrogen atom or a hydrocarbon radical, preferably having 1 to 24 carbon atoms,R4 is an organic radical, preferably having 2 to 30 carbon atoms, andn is from 0 to 5; in the form of solid particles, which are obtained by crystallization from a clear homogeneous melt dispersed in a carrier medium, and a process of preparation thereof.