Electrophotographic photoreceptor and image forming apparatus provided with the same

Patent metadata

Field	Value
Publication number	US-2015346615-A1
Application number	US-201514714541-A
Country	US
Kind code	A1
Filing date	May 18, 2015
Priority date	May 28, 2014
Publication date	Dec 3, 2015
Grant date	—

Abstract

The present invention provides an electrophotographic photoreceptor comprising a multilayered photosensitive layer or a monolayer photosensitive layer,
wherein the multilayered photosensitive layer comprises at least a charge generation layer containing a charge generation material and a charge transport layer containing a charge transport material that are stacked on a conductive substrate in this order, and

the monolayer photosensitive layer contains a charge generation material and a charge transport material that is stacked on a conductive substrate,

wherein the electrophotographic photoreceptor contains 5 to 17 wt % of fluorine resin fine particles and their aggregates with respect to all photoreceptor components in a surface layer of the photoreceptor,

wherein the fluorine resin fine particles are 0.1 to 0.5 μm in average primary particle diameter,

the aggregates are 1 to 3 μm in constant direction tangent diameter,

the number of the aggregates is 10 to 40% of the number of the fluorine resin fine particles.

First claim

1 . An electrophotographic photoreceptor comprising a multilayered photosensitive layer or a monolayer photosensitive layer,
wherein the multilayered photosensitive layer comprises at least a charge generation layer containing a charge generation material and a charge transport layer containing a charge transport material that are stacked on a conductive substrate in this order, and the monolayer photosensitive layer contains a charge generation material and a charge transport material that is stacked on a conductive substrate, wherein the electrophotographic photoreceptor contains 5 to 17 wt % of fluorine resin fine particles and their aggregates with respect to all photoreceptor components in a surface layer of the photoreceptor, wherein the fluorine resin fine particles are 0.1 to 0.5 μm in average primary particle diameter, the aggregates are 1 to 3 μm in constant direction tangent diameter, the number of the aggregates is 10 to 40% of the number of the fluorine resin fine particles.

2 . The electrophotographic photoreceptor according to claim 1 , wherein the fluorine resin fine particles are 0.2 to 0.4 μm in average primary particle diameter, and the number of the aggregates is 15 to 38% of the number of the fluorine resin fine particles.

3 . The electrophotographic photoreceptor according to claim 1 , wherein the fluorine resin fine particles are tetrafluoroethylene resin fine particles.

4 . The electrophotographic photoreceptor according to claim 1 comprising a multilayered photosensitive layer having an undercoat layer stacked on the conductive substrate.

5 . The electrophotographic photoreceptor according to claim 1 comprising the multilayered photosensitive layer formed of two charge transport layers different in concentration of the charge transport material, wherein a surface layer of the charge transport layers contains the fluorine resin fine particles.

6 . An image forming apparatus provided with the electrophotographic photoreceptor according to claim 1 ; charge means for charging the electrophotographic photoreceptor; exposure means for exposing the charged electrophotographic photoreceptor so as to form an electrostatic latent image; developing means for developing the electrostatic latent image with toner to form a toner image; transfer means for transferring the toner image onto a recording material; and fixing means for fixing the transferred toner image on the recording material.

Assignees

• Sharp Kk

Inventors

• Kihara Akiko
• Fukushima Kotaro
• Hashimoto Masaki
• Toriyama Koichi
• Kurauchi Takahiro
• Matsuo Rikiya
• Kanazawa Tomoko
• Iibachi Chikako

Classifications

• G03G5/0503

  Inert supplements · CPC title

• G03G5/0539 Primary

  Halogenated polymers · CPC title

• G03G5/051

  Organic non-macromolecular compounds · CPC title

• G03G5/142

  Inert intermediate layers · CPC title

• G03G5/14726

  Halogenated polymers · CPC title