LOW-TEMPERATURE-CURABLE, SOLID POLYURETHANE POWDER COATING COMPOSITIONS CONTAINING URETDIONE GROUPS

摘要

Disclosed are low-temperature-curable, solid polyurethane powder coating compositions containing uretdione groups and processes for preparing such compositions. The powder coating compositions contain quaternary ammonium hydroxides or fluorides as catalysts. The coating compositions of the invention are useful for producing plastics, especially powder coatings, which crosslink to high-gloss or matt, light- and weather-stable coating films.