Phthalocyanine composition for electrophotographic photoreceptor comprises oxytitanium phthalocyanine and metal-free phthalocyanine

摘要

Providing organic photoreceptors having higher sensitivity properties imparted by using different materials which separately have charge generation function and a charge transportation function. A phthalocyanine composition comprises oxytitanium phthalocyanine and metal-free phthalocyanine. It has a crystal form having peaks at Bragg angles (2 eta ! 0.2 deg ) of 7 deg , 9 deg , 14.1 deg , 18 deg , 23.7 deg and 27.3 deg in copper potassium- alpha 1.541- Angstrom X ray diffraction spectrum and having no peak at a Bragg angle (2 eta ! 0.2 deg ) of 9.5 deg in the copper potassium- alpha 1.541- Angstrom X ray diffraction spectrum. Independent claims are included for the following: (a) a process for the production of a phthalocyanine composition comprising carrying out crystal transformation treatment of an amorphous oxytitanium phthalocyanine (TiOPc) and an amorphous metal-free phthalocyanine in a solvent containing water and a naphthalene, to convert them into a composition containing TiOPc and a metal-free phthalocyanine;and (b) an electrophotographic photoreceptor comprising an electrically conductive substrate and a photosensitive layer containing the phthalocyanine composition as a charge-generating material.