Electrophotographic photoreceptor, image forming apparatus using the same, and image forming method

Patent metadata

Field	Value
Publication number	US-9766560-B2
Application number	US-201615259627-A
Country	US
Kind code	B2
Filing date	Sep 8, 2016
Priority date	Sep 16, 2015
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

An electrophotographic photoreceptor for use in an image forming apparatus having a proximity charge-type charging unit includes a conductive support and at least photosensitive layer and surface layer laminated in order on the conductive support, wherein the surface layer includes (A) a charge transport material, (B) a cured product of a composition containing a polymerizable compound and inorganic fine particles, and (C) organic fine particles, and the inorganic fine particles contain a metal oxide, has a surface treated with a surface treatment agent having a reactive organic group, and has a volume resistivity of 1.2×1011Ω·cm or more.

First claim

What is claimed is:

1. An electrophotographic photoreceptor for use in an image forming apparatus having a proximity charge-type charging unit, the electrophotographic photoreceptor comprising a conductive support and at least photosensitive layer and surface layer laminated in order on the conductive support, wherein
the surface layer comprises
(A) a charge transport material,
(B) a cured product of a composition containing a polymerizable compound and inorganic fine particles, and
(C) organic fine particles, and
the inorganic fine particles contain a metal oxide, has a surface treated with a surface treatment agent having a reactive organic group, and has a volume resistivity of 1.2×10 11 Ω·cm or more.

2. The electrophotographic photoreceptor according to claim 1 , wherein the metal oxide is SiO 2 or Al 2 O 3 .

3. The electrophotographic photoreceptor according to claim 1 , wherein the charge transport material is represented by the following general formula (1):

wherein, R 1 and R 2 are each independently a hydrogen atom or a methyl group, and R 3 is a linear or branched alkyl group having 1 to 5 carbon atoms, a methacryloyloxy group, or an acryloyloxy group.

4. The electrophotographic photoreceptor according to claim 1 , wherein the photosensitive layer has a film thickness of 15 μm or more but 20 μm or less.

5. The electrophotographic photoreceptor according to claim 1 , wherein the organic fine particles are melamine-formaldehyde condensation resin particles.

6. An image forming apparatus comprising:
the electrophotographic photoreceptor according to claim 1 ; and
the proximity charge-type charging unit in which AC is superimposed.

7. A method for forming an image, comprising forming an electrophotographic image with a use of the image forming apparatus according to claim 6 .

Assignees

• Konica Minolta Inc

Inventors

• Kurachi Masahiko

Classifications

• G03G5/14791

  Macromolecular compounds characterised by their structure, e.g. block polymers, reticulated polymers, or by their chemical properties, e.g. by molecular weight or acidity · CPC title

• G03G5/0507 Primary

  Inorganic compounds · CPC title

• G03G5/14769

  Other polycondensates comprising nitrogen atoms with or without oxygen atoms in the main chain · CPC title

• G03G5/0546

  Polymers comprising at least one carboxyl radical, e.g. polyacrylic acid, polycrotonic acid, polymaleic acid; Derivatives thereof, e.g. their esters, salts, anhydrides, nitriles, amides · CPC title

• G03G5/14704

  comprising inorganic material · CPC title