Process for the preparation of pulverulent (poly)ureas by means of spray drying
OwnerBernd Kray, Wilhelm Laufer +2inventors
InventorsBernd Kray, Wilhelm Laufer, Patrick Galda, Achim Fessenbecker
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Abstract
The present invention relates to a process for the preparation of (poly)urea powders, novel (poly)urea powders, compositions comprising them and the use thereof as thickening agents, in particular in lubricants, such as so-called polyurea greases.
Claims28
Process for the preparation of a (poly)urea powder, characterized in that a suspension of (poly)urea particles in at least one solvent is subjected to spray drying.
(Poly)urea powder which has an average particle size of less than 50 μm.
(Poly)urea powder which has a specific surface area of more than 20 m2/g (measured by Hg porosimetry).
Use of a high-pressure homogenizer for the preparation of (poly)urea dispersions in at least one base oil and/or solvent.
Dependencies are inferred from the claim text.