POWDER COATING CROSS-LINKING AGENTS OF HIGH FUNCTIONALITY WHICH CONTAIN URETDIONE GROUPS AND FREE ISOCYANATE GROUPS

摘要

The invention relates to new high-functional polyaddition compounds which contain free isocyanate groups with an average isocyanate functionality of 2.1 to 8. 0, a concentration of uretdione of 10 to 18 wt.%, a concentration of urethane of 10 to 20 wt.% and a concentration of ester groups -CO-O and/or carbonate groups -O-CO -O of 1 to 17 wt.%, a process for the preparation thereof and their use as starting components for the preparation of polyurethane plastics, in particular as cross-linking agents for heat-curable powder coatings