Electrophotographic photoreceptor, electrophotographic photoreceptor cartridge, and image forming apparatus

摘要

The invention provides an electrophotographic photoreceptor showing suitable electric characteristics, capable of forming a favorable image even after repeated use for long term and capable of forming a high quality image free from image defects such as a memory phenomenon, an electrophotographic process cartridge using such an electrophotographic photoreceptor, and an image forming apparatus using such an electrophotographic photoreceptor.
The electrophotographic photoreceptor comprises a photosensitive layer which contains oxytitanium phthalocyanine showing chief diffraction peaks at Bragg angles (2¸ ± 0.2°) of 9.5°, 9.7°, 24.2° and 27.2° to CuK± characteristic X-ray (wavelength: 1.541 Å) obtained by subjecting a phthalocyanine crystal precursor to an acid pasting method and then bringing it into contact with an organic solvent, and a hydrazone compound represented by the following formula (1):
and the oxytitanium phthalocyanine is obtained by crystal conversion from oxytitanium phthalocyanine having a chlorine content of at most 0.4 wt%, or oxytitanium phthalocyanine in which the ratio of chlorinated oxytitanium phthalocyanine to non-substituted oxytitanium phthalocyanine is at most 0.05 by the mass spectrum intensity ratio.