Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus
First Claim
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1. An electrophotographic photosensitive member, comprising:
- an electro-conductive support;
an undercoat layer on the electro-conductive support, the undercoat layer comprising a urethane binder resin and titanium oxide secondary particles, said titanium oxide secondary particles being an aggregate of titanium oxide primary particles; and
a photosensitive layer on the undercoat layer, whereinthe number average particle diameter of the titanium oxide primary particles is 1 to 10 nm, andthe number average particle diameter of the titanium oxide secondary particles is 200 to 500 nm.
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Abstract
There is provided an electrophotographic photosensitive member in which the variation in potential during repeated use is reduced. The electrophotographic photosensitive member is the electrophotographic photosensitive member of which an undercoat layer comprises a urethane resin and titanium oxide particles whose primary particle and secondary particle diameters are defined.
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Citations
13 Claims
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1. An electrophotographic photosensitive member, comprising:
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an electro-conductive support; an undercoat layer on the electro-conductive support, the undercoat layer comprising a urethane binder resin and titanium oxide secondary particles, said titanium oxide secondary particles being an aggregate of titanium oxide primary particles; and a photosensitive layer on the undercoat layer, wherein the number average particle diameter of the titanium oxide primary particles is 1 to 10 nm, and the number average particle diameter of the titanium oxide secondary particles is 200 to 500 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A process cartridge and at least one unit selected from the group consisting of a charging unit, a developing unit, a transferring unit and a cleaning unit, said process cartridge being detachably attachable from a main body of an electrophotographic apparatus and integrally supporting an electrophotographic photosensitive member, the electrophotographic photosensitive member comprises:
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an electro-conductive support; an undercoat layer on the electro-conductive support, the undercoat layer comprising a urethane binder resin and titanium oxide secondary particles, said titanium oxide secondary particles being an aggregate of titanium oxide primary particles; and a photosensitive layer on the undercoat layer, wherein the number average particle diameter of the titanium oxide primary particles is 1 to 10 nm, and the number average particle diameter of the titanium oxide secondary particles is 200 to 500 nm.
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12. An electrophotographic apparatus comprising:
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a charging unit; an exposing unit; a developing unit; a transferring unit; and an electrophotographic photosensitive member, the electrophotographic photosensitive member comprising an electro-conductive support, an undercoat layer on the electro-conductive support, and a photosensitive layer on the undercoat layer, wherein the undercoat layer comprises a urethane binder resin, and titanium oxide secondary particles, said titanium oxide secondary particles being an aggregate of titanium oxide primary particles, the number average particle diameter of the titanium oxide primary particles is 1 to 10 nm, and the number average particle diameter of the titanium oxide secondary particles is 200 to 500 nm. - View Dependent Claims (13)
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Specification