Process for the preparation of polyureas in powder form

摘要

Preparation of a (poly)urea powder (I) comprises reacting an isocyanate with an amine in a solvent in a reactor, powdering the formed (I) by using shear stress during its formation and drying in the reactor. Independent claims are also included for: (1) (I) (having an average particle diameter of 20-100 mu m) obtained by the method; and (2) a method for preparing a composition comprising suspending the obtained powder of (I) in at least a basis oil.