Patent ID: 9323165
Filing Date: 2016-04-26
CPC Classification: G03G

Claim Text:
1. An electrophotographic photoreceptor comprising: a conductive support; a photosensitive layer formed on the conductive support; and a surface layer formed on the photosensitive layer, wherein the surface layer contains barium sulfate composite fine particles in a cured resin, wherein each of the barium sulfate composite fine particles is composed of a core material made from barium sulfate and a conductive metal oxide adhered to the surface of the core material; a 10 point average roughness RzJIS of the surface layer is not less than 0.2 μm and not more than 1.5 μm; and a value obtained by an equation n×d is not less than 10,000 (pieces·nm) and not more than 200,000 (pieces·nm) where n represents a peak count of the surface layer and d represents a number average primary particle diameter of the barium sulfate composite fine particles; the peak count (n) of the surface layer is 20 to 1,000 pieces per length of 8.0 mm; the number average primary particle diameter of the barium sulfate composite fine particles is 50 to 500 nm; the barium sulfate composite fine particles are those subjected to a surface treatment with a surface treating agent having a polymerizable functional group.