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.degree.C and liquid above 150.degree.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.