Process for the preparation of heat curable weather-resistant polyurethane powder coatings, and the coatings thus obtained

摘要

Polyurethane powder coating compositions of high reactivity, containingPPa) an isocyanate component which is partially or totally blocked with 1,2,4-triazole,PPb) hydroxyl- containing polymers, andP Pc) if desired, customary auxiliaries and additives, where the isocyanate component is a physical mixture of individual trimers (isocyanato-isocyanurates) of aliphatic and (cyclo)aliphatic and/or cycloaliphatic diisocyanates provide heat curable weather resistant coatings.