Patent ID: 9568846
Date: 2017-02-14
CPC Classifications: G03G

Claim:
1. An electrophotographic photosensitive member comprising: a support; an undercoat layer on the support; and a photosensitive layer on the undercoat layer, wherein the undercoat layer contains zinc oxide particles subjected to a surface treatment with an organometallic compound or an organosilicon compound and titanium oxide particles subjected to a surface treatment with an organometallic compound or an organosilicon compound, the titanium oxide particles have an average primary particle diameter of 100 nm or more and 600 nm or less, and a volume ratio of the titanium oxide particles represented by formula (1) is 1.0 or more and 25 or less: where, in formula (1), R1 represents an average primary particle diameter of the zinc oxide particles, R2 represents an average primary particle diameter of the titanium oxide particles, S1 represents an area ratio of the zinc oxide particles relative to a total area of the zinc oxide particles and the titanium oxide particles per unit area of the undercoat layer, and S2 represents an area ratio of the titanium oxide particles relative to the total area of the zinc oxide particles and the titanium oxide particles per unit area of the undercoat layer.