Patent · US Expired

Defoamers for aqueous media

US6552092B2 · kind B2 · utility

6Cited by

9References

3Claims

0Family size

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	Feb 5, 2002
Grant date	Apr 22, 2003
Priority date	—
Expiry date	Feb 5, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC10M2215/102
WIPO fieldChemical engineering
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.