Method of making hydroxygallium phthalocyanine type V photoconductive imaging members

A process for the preparation of a layered photoconductive imaging member consisting essentially of hydrolyzing a gallium phthalocyanine precursor pigment by dissolving said gallium phthalocyanine in a strong acid and then reprecipitating the resulting dissolved pigment in basic aqueous media;

• removing any ionic species formed by washing with water;
• concentrating the resulting aqueous slurry comprised of water and hydroxygallium phthalocyanine to a wet cake;
• removing water from said slurry by azeotropic distillation with an organic solvent;
• and subjecting said resulting hydroxygallium phthalocyanine pigment slurry to mixing with the addition of a second solvent to cause the formation of hydroxygallium phthalocyanine type V;
• providing a supporting substrate and depositing thereover a photogenerating layer of said hydroxygallium phthalocyanine type V and a charge transport layer.