Patent ID: 6420324
Filing Date: 2002-07-16
Classification: B01D,C07C,C08K,C09D,C10M

Abstract:
An aqueous composition, comprising, as defoamers, a dispersion of urea derivatives in the form of solid particles of the formula I whereR1 is a hydrocarbon radical, a hydrocarbon radical having one nitrogen atom, or a hydrocarbon radical having one carbonyl group, R2 is a hydrogen atom or a hydrocarbon radical, R3 is a hydrogen atom or a hydrocarbon radical, R4 is an organic radical, and n is from 0 to 5; â€ƒin a carrier medium which comprises an organic oil, a mineral oil, a siloxane, an organomodified siloxane or a mixture of these compounds, wherein said urea derivatives are obtained by crystallizing the urea derivative from a clear homogeneous melt in said carrier medium.