Patent ID: 8420283

Claim:
A coating liquid for forming an undercoat layer of an electrophotographic photoreceptor containing metal oxide particles and a binder resin, wherein the metal oxide particles have a cumulative volume average diameter D 50 of 0.1 μm or less and a volume particle size distribution width index SD satisfying the following Expression (1) which are measured by a dynamic light-scattering method in the coating liquid for forming an undercoat layer, 0.010≦SD≦0.040 (1) wherein SD=(D 84 −D 16 )/2, wherein D 84 represents the particle diameter (μm) at a point of 84% in the cumulative volume particle size distribution curve, and D 16 represents the particle diameter (μm) at a point of 16% in the cumulative volume particle size distribution curve; and particle size distribution is accumulated from the smaller particle size side.