US Patent 7351474 Pigment preparations

A pigment formulation in granule form obtainable by a) dispersing at least two different pigments (A) in a solution of a thermoplastic polymer (B) in an organic solvent in the presence or absence of a dispersant (C), and b) applying as a layer the dispersion produced in step a) to granules of a thermoplastic polymer (B′), which is the same as the polymer (B), with removal of the solvent, wherein the pigment formulation includes the granules of the thermoplastic polymer (B′); and a coating on the granules of the thermoplastic polymer (B′), where the coating comprises the at least two different pigments (A) and the thermoplastic polymer (B).