PREPARATION OF PIGMENT COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a process for preparing a pigment composition with an improved productivity which can realize high dispersibility and high coloring power. SOLUTION: This process comprises: (A) a step of mixing an organic pigment in water with thermoplastic resin particles having an average particle size of not larger than 500μm, (B) a step of filtering the organic pigment and the thermoplastic resin particles from water and (C) a step of kneading the mixture obtained in the step (B) under heat at a temperature not lower than the softening point of the thermoplastic resin particles. The organic pigment is preferably in the form of an organic pigment-water slurry or an organic pigment-water paste where the organic pigment is not aggregated in a dry state.