Patent ID: 8323861

Claim:
An electrophotographic photoreceptor comprising an undercoat layer comprising metal oxide particles and a binder resin on an electroconductive substrate, and a photosensitive layer disposed on the undercoat layer, wherein the metal oxide particles are present in the form of primary particles and aggregated secondary particles and have a volume average particle diameter of 0.1 μm or less and a 90% cumulative particle diameter of 0.3 μm or less which are measured by a dynamic light-scattering method in a liquid of the undercoat layer dispersed in a solvent mixture of methanol and 1 propanol at a weight ratio of 7:3; and the photosensitive layer comprises an oxytitanium phthalocyanine having a distinct main diffraction peak at a Bragg angle (2θ±0.2°) of 27.3° in an X-ray diffraction spectrum.