Patent ID: 7855286

Claim:
A method for preparing a titanyl phthalocyanine crystal having the main peak at a Bragg angle 2θ±0.2°=27.2° in CuKα characteristic X-ray diffraction spectrum and one peak within the range of 270 to 400° C. other than a peak accompanied by the vaporization of adsorbed water in a differential scanning calorimetric analysis and comprising the following processes from (a) to (c); (a) a process for preparing a titanyl phthalocyanine compound by adding a titanium alkoxide or titanium tetrachloride at a value within the range of 0.40 to 0.53 mole with respect to 1 mole of o-phthalonitrile or its derivative or 1,3-diiminoisoindoline or its derivative and adding a urea compound at a value within the range of 0.1 to 0.95 mole with respect to 1 mole of o-phthalonitrile or its derivative or 1,3-diiminoisoindoline or its derivative to react the compounds, (b) a preliminary process for performing an acid treatment by stirring and stabilizing in a water-soluble organic solvent on the titanyl phthalocyanine compound prepared in the process (a), (c) a process for preparing a titanyl phthalocyanine crystal by performing an acid treatment on the titanyl phthalocyanine compound prepared in the process (b).