Process for the preparation of powder coatings

Abstract

The invention relates to a process of preparation of powder coating compositions providing a desired gloss level of the resulted coatings comprising the following steps of a) providing particles of at least one powder coating composition having a number average particle size in the range of 1 to 300 μm, and b) mixing these particles with particles of at least one powder coating composition having a number average particle size in the range of 1 to 300 μm, the particles of which are irradiated with high energy radiation under near-ambient temperature, in a mixing ratio of 1:99 to 99:1; the process according to the invention provides powder coating compositions producing a desired gloss level of the coatings by varying the time period and/or the intensity of the high energy irradiation of the powder coating particles or by varying the mixing ratio between the non-irradiated powder particles and the irradiated powder particles.

Dependencies are inferred from the claim text.