Electrophotographic photosensitive member and image forming apparatus

Patent metadata

Field	Value
Publication number	US-9436104-B2
Application number	US-201414288614-A
Country	US
Kind code	B2
Filing date	May 28, 2014
Priority date	May 31, 2013
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

An electrophotographic photosensitive member includes a photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, and a binder resin. The hole transport material contains an amine stilbene derivative represented by a general formula (1), and the binder resin contains a polycarbonate resin represented by a general formula (2).

First claim

What is claimed is:

1. An electrophotographic photosensitive member comprising:
a photosensitive layer, wherein
the photosensitive layer is either
a single-layer photosensitive layer containing a charge generating material, a hole transport material, and a binder resin, or
a multi-layer photosensitive layer in which a charge generating layer containing the charge generating material and a charge transport layer containing the hole transport material and the binder resin are stacked,

the hole transport material contains an amine stilbene derivative HTM-5 represented by a chemical formula (11) or an amine stilbene derivative HTM-6 represented by a chemical formula (12),
the charge generating material contains PY-128 represented by a chemical formula (28), and
the binder resin contains a polycarbonate resin represented by a general formula (2),

in the general formula (2),
R 21 and R 22 each represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a phenyl group, or R 21 and R 22 are bonded together to form a cycloalkylidene group having 5 to 8 carbon atoms,
R 23 to R 25 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and
p+q=1 and p≧0.4 are both satisfied.

2. An electrophotographic photosensitive member according to claim 1 , wherein
in the general formula (2), R 21 represents an ethyl group, and R 22 represents a methyl group.

3. An electrophotographic photosensitive member according to claim 1 , wherein
the binder resin has a viscosity average molecular weight of 30,000 or more.

4. An electrophotographic photosensitive member according to claim 1 , wherein
the single-layer photosensitive layer contains an electron transport material.

5. An image forming apparatus comprising:
an image bearing member;
a charger configured to charge a surface of the image bearing member;
an exposure configured to expose the surface of the image bearing member charged by the charger to light so as to form an electrostatic latent image on the surface;
a developer configured to develop the electrostatic latent image into a toner image; and
a transfer unit configured to transfer the toner image from the image bearing member to a transfer target, wherein
the image bearing member is an electrophotographic photosensitive member according to claim 1 .

6. An electrophotographic photosensitive member according to claim 1 , wherein
the photosensitive layer is the multi-layer photosensitive layer, and
the charge transport material contains at least one of ETM-1 to ETM-8 respectively represented by chemical formulas (13) to (20)

Assignees

• Kyocera Document Solutions Inc

Inventors

• Azuma Jun
• Maruo Keiji
• Okawa Kensuke
• Ogata Akihiko

Classifications

• G03G5/047 Primary

  characterised by the charge-generation layers or charge transport layers {(G03G5/0433 and G03G5/0436 take precedence)} · CPC title

• G03G5/0564

  Polycarbonates · CPC title

• G03G5/0672

  containing two or more methine or polymethine groups · CPC title

• G03G5/0614

  Amines · CPC title

• G03G5/06147

  alkenylarylamine · CPC title