Patent ID: 8686133

Claim:
An oxo-titanylphthalocyanine crystal having main diffraction peaks at a Bragg angle (2Î¸Â±0.2Â°)=9.5Â° and 27.2Â° in a CuKÎ± characteristic X-ray diffraction spectrum and one peak in a temperature range from 270 to 400Â° C. other than the peak derived from vaporization of adsorbed water in differential scanning calorimetric analysis, the oxo-titanylphthalocyanine crystal having the absorbance for light which is within a range from 0.01 to 0.08 in a wavelength of 400 nm and which is measured for a filtrate obtained by filtering of a suspension including the oxo-titanylphthalocyanine crystal, when adding the oxo-titanylphthalocyanine crystal in an amount by weight of 1.25 parts based on 100 parts by weight of a mixed solvent of methanol and N,N-dimethylformamide (methanol:N,N-dimethylformamide=1:1 (by weight ratio)) to prepare the suspension, and the oxo-titanylphthalocyanine crystal being produced by a production method comprising the following steps (a)â€² to (d): (a)â€² a step of performing a pre-acid treatment in which an oxo-titanylphthalocyanine compound produced in the presence of a urea compound is added in an aqueous organic solvent which is at least one type selected from the group consisting of alcohols, N,N-dimethylformamides, propionic acid, acetic acid, N-methylpyrrolidone and ethylene glycol, the mixture is stirring in the condition of a fixed temperature of about 70 to 200Â° C. for about 1 to 3 hours and stabilizing in an aqueous organic solvent in the condition of a fixed temperature range of about 10 to 50Â° C. for 5 to 15 hours; (a) a step of dissolving a crude oxo-titanylphthalocyanine crystal in an acid to obtain an oxo-titanylphthalocyanine solution; (b) a step of adding the oxo-titanylphthalocyanine solution dropwise in a poor solvent to obtain a wet cake; (c) a step of washing the wet cake with an alcohol having 1 to 4 carbon atoms; and (d) a step of stirring the washed wet cake under heating in a nonaqueous solvent to obtain an oxo-titanylphthalocyanine crystal.