Patent ID: 7998650

Claim:
A method for preparing an oxytitanium phthalocyanine as a charge generating material, comprising the steps of: mixing 30-100 wt % sulfuric acid and an oxytitanium phthalocyanine crude in a mixing ratio between 100:1 and 1:1; homogeneously grinding the mixture in a wet grinder containing at least one grinding media selected from the group consisting of a zirconia and glass beads at −20° C.-60° C. for 0.1-24 hours to form a ground mixture comprising an oxytitanium phthalocyanine component, the grinding media and the sulfuric acid; adding a solvent to the ground mixture to form a diluted mixture; separating the grinding media from the diluted mixture to obtain an oxytitanium phthalocyanine mixture comprising the oxytitanium phthalocyanine and the solvent; and isolating the oxytitanium phthalocyanine.