Filler for powder coating material and powder coating composition containing the same

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 (cm2/g) wherein ρ denotes an absolute specific gravity of the inorganic particles, and
• wherein the inorganic particles are heavy calcium carbonate.