Patent ID: 8138253

Claim:
A powder coating composition which comprises a filler for powder coating material and a powder coating resin as indispensable components, where the filler for powder coating material comprises inorganic particles having Mohs hardness of 1 to 4 and satisfying the following particle size distribution of the following relationships (1) to (6): 2≦A≦30 (1), 0≦B35 (2), 1≦C≦25 (3), 1≦D≦6 (4), E≦100 (5), and F≦100 (6) wherein, A: Cumulative 50 vol. % diameter (median diameter) of the inorganic particles determined by a laser type particle size distribution meter (Microtrac FRA) [μm]; B: Cumulative undersize for one-half the cumulative 50 vol. % diameter (median diameter) of the inorganic particles determined by a laser type particle size distribution meter (Microtrac FRA) [vol. %] C: Value obtained by dividing the cumulative 90 vol. % diameter of the inorganic particles determined by a laser type distribution meter (Microtrac FRA) by the cumulative 10 vol. % diameter [-]; D: Value obtained by dividing the cumulative 75 vol. % diameter of the inorganic particles determined by a laser type distribution meter (Microtrac FRA) by the cumulative 25 vol. % diameter [-]; E: Maximum particle diameter of the inorganic particles in particle-diameter fraction frequency distribution determined by a laser type distribution meter (Microtrac FRA) [μm]; and F: Oversize residue with a sieve with 32 μm mesh [ppm], wherein the inorganic particles have a powder specific surface area Sw under constant pressure ventilation from 4050/ρ to 40500/ρ (cm 2 /g) wherein ρ denotes an absolute specific gravity of the inorganic particles, and wherein the inorganic particles are heavy calcium carbonate.