Defoamers for aqueous media

Details Defoamers for aqueous media Defoamers for aqueous media

B - Operations, Transporting

01

D

B01D 19/04 (2006.01) C07C 275/14 (2006.01) C08J 3/20 (2006.01) C08K 5/21 (2006.01) C10M 133/20 (2006.01) C10M 171/00 (2006.01)

Patent

CA 2305906

The invention relates to compositions for defoaming aqueous media, comprising as defoamers urea derivatives of the formula I (see formula I) where R1 - is a hydrocarbon radical having 4 to 30 carbon atoms or a hydrocarbon radical having 4 to 24 carbon atoms and one nitrogen atom or a hydrocarbon radical having 4 to 30 carbon atoms and one carbonyl group, R2 - is a hydrogen atom or a hydrocarbon radical having 1 to 24 carbon atoms, R3 - is a hydrogen atom or a hydrocarbon radical having 1 to 24 carbon atoms, R4 - is an organic radical having 2 to 30 carbon atoms and n - 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.

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