Patent ID: 6914115
Filing Date: 2005-07-05
Classification: C08G,C09D,Y10T

Abstract:
1. A polyurethane powder coating composition, comprising: A) at least one uretdione-containing powder coating hardener derived from one or more aliphatic, (cyclo)aliphatic, cycloaliphatic, or aromatic polyisocyanates and one or more hydroxyl-containing compounds, and/or one or more monoamines, and having a melting point from 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 hydroxyl-containing polymer having a melting point from 40 to 130° C., and an OH number between 20 and 200 mg KOH/gram, and C) at least one catalyst of the formula [NR wherein components A) and B) are present in a ratio, such that for each hydroxyl group of component B), there is from 0.3 to 1 uretdione group of component A), and the fraction of component C) is 0.001-3% by weight of the total amount of components A) and B).