Process for the preparation of powder coatings and their use.

摘要

A process for the preparation of powder coatings having a glass transition temperature of from 20 to 80 DEG C by mixing A) a polyol component having a hydroxyl number of from 30 to 155 and a glass transition temperature of from 30 to 120 DEG C, B) a polyisocyanate component having a glass transition temperature of from -45 to +45 DEG C, comprising at least one ketoxime-blocked polyisocyanate, C) a catalyst component comprising at least one catalyst for the reaction between blocked isocyanate groups and hydroxyl groups, and optionally D) further assistants and additives, by dissolving the starting components in an inert solvent having a boiling range of from 50 to 150 DEG C, and subsequently freeing the solution from solvent and simultaneously and/or subsequently converting the resultant solid into the powder form, and the use of the resultant powder coatings for the production of coatings on any desired heat-resistant substrates by the methods of powder coating technology.