Blocked polyisocyanate crosslinkers for providing improved flow properties to coating compositions

摘要

The present invention is directed to a powder coating composition containing as binder A) a polyisocyanate component which contains blocked isocyanate groups, is present in powder form, is solid below 40 DEG C. and liquid above 150 DEG C., and contains one or more polyisocyanates i) having a blocked NCO content (calculated as NCO, MW 42) of 5 to 25% by weight and ii) containing fluorine (calculated as F, AW 19) in an amount of 0.01 to 20% by weight, wherein the preceding percentages are based on the solids content of the polyisocyanate mixture and B) a polyhydroxyl component containing one or more high molecular weight polyols.