Electrophotographic photoreceptor and manufacturing method therefor
View Patent ↗In an electrophotographic photoreceptor having a photosensitive layer on an electroconductive substrate, the photosensitive layer is a positive-charging laminate comprising at least a charge transport layer and a charge generating layer laminated in that order, with the charge generating layer containing at least a resin binder, a charge generating agent, a space filler and an electron transport agent, while the charge transport layer contains at least, as a resin binder, polystyrene and a hole transport agent, and mineral oil of the charge transport layer is in an amount of 1% by mass or less of an amount of polystyrene. Thus, a highly durable and economic positive-charging multilayer electrophotographic photoreceptor and a manufacturing method therefor may be achieved.
1. An electrophotographic photoreceptor, comprising:
an electroconductive substrate; and
a photosensitive layer disposed over the electroconductive substrate,
wherein the photosensitive layer includes
a charge transport layer including a resin binder including polystyrene and a hole transport agent, and mineral oil in an amount of 1% by mass or less of an amount of the polystyrene,
a charge generating layer disposed over the charge transport layer, and
wherein the charge generating layer includes a resin binder, a charge generating agent, a space filler and an electron transport agent.
2. The electrophotographic photoreceptor according to claim 1 , wherein the hole transport agent is a triphenylamine hole transport agent.
3. The electrophotographic photoreceptor according to claim 1 , wherein the hole transport agent is a stilbene hole transport agent.
4. The electrophotographic photoreceptor according to claim 1 , wherein the hole transport agent is a benzidine hole transport agent.
5. The electrophotographic photoreceptor according to claim 1 , wherein the hole transport agent is a hydrazone hole transport agent.
6. The electrophotographic photoreceptor according to claim 1 , wherein the charge transport layer contains an antioxidant.
7. The electrophotographic photoreceptor according to claim 6 , wherein the antioxidant is a phenol antioxidant.
8. The electrophotographic photoreceptor according to claim 6 , wherein the antioxidant is a phosphonite antioxidant.
9. The electrophotographic photoreceptor according to claim 1 , wherein the space filler is a triphenylbenzene space filler.
10. The electrophotographic photoreceptor according to claim 1 , wherein the space filler is an aromatic ester space filler.
11. The electrophotographic photoreceptor according to claim 1 , wherein the charge generating agent is a phthalocyanine charge generating agent.
12. The electrophotographic photoreceptor according to claim 11 , wherein the phthalocyanine charge generating agent is metal-free phthalocyanine.
13. The electrophotographic photoreceptor according to claim 11 , wherein the phthalocyanine charge generating agent is titanyl phthalocyanine.
14. The electrophotographic photoreceptor according to claim 1 , wherein the electron transport agent is an azoquinone electron transport agent.
15. The electrophotographic photoreceptor according to claim 1 , wherein the electron transport agent is a benzoquinone electron transport agent.
16. The electrophotographic photoreceptor according to claim 1 , wherein the electron transport agent is naphthoquinone electron transport agent.
17. The electrophotographic photoreceptor according to claim 1 , wherein the photosensitive layer is a positive-charging laminate.
18. The electrophotographic photoreceptor according to claim 1 , wherein the charge generating layer is laminated on the charge transport layer.
19. A method forming a photosensitive layer for manufacturing an electrophotographic photoreceptor, the method comprising:
applying a charge generating layer coating liquid including a resin binder, a charge generating agent, a space filler and an electron transport agent over an electroconductive substrate; and
applying a charge transport layer coating liquid over the charge generating layer coating liquid, the charge transport layer coating liquid including a resin binder including polystyrene and a hole transport agent, and mineral oil in an amount of 1% by mass or less of an amount of the polystyrene.