JP2014029500A5 - - Google Patents

Claims (11)

An electrophotographic photoreceptor having a laminate and a hole transport layer formed on the laminate layer,
The laminate has a conductive support, an electron transport layer formed on the conductive support, and the charge generation layer formed on the electron transport layer,
The electrophotographic photoreceptor, wherein the laminate satisfies the following formula (1).
R_opt / R_dark ≦ 0.95 Formula (1)
(In the above formula (1),
R_opt is a method in which a circular gold electrode having a film thickness of 300 nm and a diameter of 10 mm is provided by sputtering on the surface of the charge generation layer of the laminate, and light having an irradiation intensity of 30 μJ / cm ² · sec is applied to the surface of the charge generation layer. Represents an impedance measured by applying an AC electric field of 100 mV and 0.1 Hz between the conductive support and the gold electrode.
R_dark is formed by forming a circular gold electrode having a thickness of 300 nm and a diameter of 10 mm on the surface of the charge generation layer of the laminate by sputtering, and irradiating the surface of the charge generation layer with light. It represents the impedance measured by applying an AC electric field of 100 mV and 0.1 Hz between the support and the gold electrode. ) The electrophotographic photosensitive member according to claim 1, wherein the laminate satisfies the following formula (2).
0 <R_opt / R_dark ≦ 0.85 Formula (2)   The electrophotographic photosensitive member according to claim 1, wherein the thickness of the electron transport layer is from 0.2 μm to 0.7 μm.   2. The electron transport layer is a layer containing a polymer obtained by polymerizing a composition containing an electron transport material having a polymerizable functional group, a thermoplastic resin having a polymerizable functional group, and a crosslinking agent. 4. The electrophotographic photosensitive member according to any one of items 1 to 3.   The electrophotographic photosensitive member according to claim 4, wherein the content of the electron transport material having a polymerizable functional group is 30% by mass or more and 70% by mass or less with respect to the total mass of the composition. The electrophotographic photoreceptor according to claim 4 or 5, wherein the polymerizable functional group of the electron transport material is a hydroxy group, a thiol group, an amino group, a carboxyl group, or a methoxy group. The crosslinking agent is an isocyanate group, blocked isocyanate group, or a monovalent group represented by -CH ₂ -OR ¹ is a compound having 3 to 6 claim 4 or 5 The electrophotographic photosensitive member according to. The charge generating layer, an electrophotographic photosensitive member according to any one of claims 1 to 7 which contains at least one charge generating material selected from the group consisting of phthalocyanine pigments and azo pigments. The electrophotography according to any one of claims 1 to 8 , wherein the hole transport layer contains at least one hole transport material selected from the group consisting of a triarylamine compound, a benzidine compound, and a styryl compound. Photoconductor. An electrophotographic photosensitive member according to any one of claims 1 to 9 , and at least one means selected from the group consisting of a charging means, a developing means, a transfer means, and a cleaning means, are integrally supported, and electrophotographic A process cartridge that is detachable from the main unit. The electrophotographic photosensitive member according to any one of claims 1 to 9, as well as, a charging means, an exposure means, the electrophotographic apparatus having a developing means, and transfer means.