Patent ID: 7714062

Claim:
A powder coating composition comprising (A) at least one hydroxyl functional polyurethane resin binder, and (B) at least one polyurethane resin as cross-linking agent containing blocked isocyanate groups, wherein the at least one hydroxyl functional polyurethane resin binder (A) and the at least one polyurethane resin (B) both have a melting temperature of 60° C. to 180° C., wherein the melting temperatures are the upper end of melting ranges with a breadth of 30° C. to 150° C. and wherein the melting temperatures and the melting ranges are determined by differential scanning calorimetry at heating rates of 10 K/mm, and wherein the polyurethane resin (B) is a polyurethane with two blocked isocyanate groups per molecule which is the reaction product of 1,6-hexane diisocyanate with a diol component and with at least one blocking agent in the molar ratio x mol 1,6-hexane diisocyanate:x−1 mol diol component: 2 mol blocking agent, wherein x means a value from 2 to 6.