Patent ID: 7572876
Filing Date: 2009-08-11
Classification: C08G,Y10T

Abstract:
1. A highly reactive polyurethane powder coating composition, comprising: A) at least one uretdione powder coating hardener, based on aliphatic, (cyclo)aliphatic or cycloaliphatic polyisocyanates and compounds containing hydroxyl groups, said hardener having a melting point of 40 to 130° C., a free NCO content of less than 5% by weight and a uretdione content of 6-18% by weight, B) at least one polymer containing a hydroxyl group with a melting point of 40 to 130° C. and an OH value between 20 and 200 mg KOH/g, C) 0.001-3% by weight, based on a total weight of components A) and B), of at least one catalyst having the formula [NR wherein R R wherein components A) and B) are in such a ratio so that there is 0.3 to 1 uretdione group of component A) for each hydroxyl group of component B).