Patent ID: 9201320
Filing Date: 2015-12-01
Classification: G03G

Abstract:
1. A production process of an organic photoreceptor, the organic photoreceptor including a conductive support, an intermediate layer formed on the conductive support, and an organic photosensitive layer stacked on the intermediate layer, the process comprising: applying a coating liquid for forming the intermediate layer to the conductive support to form a coating film, the coating liquid being obtained by dissolving a binder resin in a solvent and dispersing first metal oxide fine particles and second metal oxide fine particles therein; and drying the coating film, wherein a Pe number of the first metal oxide fine particles is two or more times larger than that of the second metal oxide fine particles when the Pe number defined by a following Equation (1) is measured for following Pe number evaluation liquids under following measurement conditions using the first and second metal oxide fine particles, [in the Equation (1), μ represents a viscosity (Pa·s) of Pe number evaluation liquid 2, E represents a liquid film contraction rate (m/s) when a wet film of Pe number evaluation liquid 1 is formed, H represents a wet film thickness of Pe number evaluation liquid 1, R represents a number average primary particle size (m) of the metal oxide fine particles, k represents Boltzmann constant (J/K), and T represents a liquid temperature (K)], Measurement Conditions: Pe number evaluation liquid 1: obtained by dissolving 100 parts by mass of a binder resin in 1700 parts by mass of a solvent and dispersing 260 parts by mass of the first or second metal oxide fine particles in the solvent, wherein the binder resin and the solvent are the same as those used in the coating liquid for forming the intermediate layer; Pe number evaluation liquid 2: obtained by dissolving 100 parts by mass of a binder resin in 850 parts by mass of a solvent and dispersing 260 parts by mass of the first or second metal oxide fine particles in the solvent, wherein the binder resin and the solvent are the same as those used in the coating liquid for forming the intermediate layer; Liquid temperature: 296 K; and Wet film thickness: 32×10