| 摘要 |
PROBLEM TO BE SOLVED: To provide a photoreceptor using a binder resin capable of improving storage stability of a dispersion liquid, and to provide an image forming apparatus and a cartridge using the photoreceptor. SOLUTION: The electrophotographic photoreceptor has at least a charge generating layer and a charge transporting layer on a conductive support, and is characterized in that: the charge generating layer contains polyvinyl acetal; and when the polyvinyl acetal is subjected to proton nuclear magnetic resonance spectroscopy using dimethyl sulfoxide-d6 as a solvent, the ratio of an area (A) of a peak having the maximum at 4.28±0.02 ppm to an area (B) of a peak having the maximum at 4.38±0.02 ppm, resulting from dividing A by B (A/B), ranges from 0.8 to 1.1. The polyvinyl acetal is obtained by reacting two or more kinds of aldehydes with polyvinyl alcohol. COPYRIGHT: (C)2010,JPO&INPIT |
