Patent ID: 7649034

Claim:
A thoroughly dry mixed particulate coating powder mixture capable of being applied to a substrate to produce a coating having uniform coloring throughout said coating comprising a base composition which comprises a mixture of discrete solid resinous particles and a tinting agent comprising discrete solid organic pigment particles having an average particle size of from about 50 nanometers to about 700 nanometers and further characterized by a maximum particle surface index of about 50, said particle surface index being defined as particle surface index=D 50 x A s , where D 50 ≦2.5; where D 50 =average particle size (microns); and where A s =surface area (m 2 /g), and said organic pigment particles are present in an effective amount to color said base composition; said base composition having a viscosity of from about 2 to about 85 Pa·s, as measured using an ICI cone plate viscometer set at 160° C.