Electrophotographic photoreceptor, process cartridge, and image-forming apparatus

Patent metadata

Field	Value
Publication number	US-2018196364-A1
Application number	US-201715699008-A
Country	US
Kind code	A1
Filing date	Sep 8, 2017
Priority date	Jan 11, 2017
Publication date	Jul 12, 2018
Grant date	—

Abstract

An electrophotographic photoreceptor includes a conductive base, and a single-layer photosensitive layer disposed on the conductive base and containing a binder resin, a hole transport material, an electron transport material, and a charge generation material. When a gold electrode is provided on the photosensitive layer so as to have an electrode area of 9.3×10 −1 cm 2 , and an electric field of 27 V/μm is applied between the gold electrode and the conductive base in an environment at a temperature of 33° C. and a humidity of 80% RH by applying a voltage so that the gold electrode becomes positive, a dark electrical conductivity σ d (1/(Ω·cm)) per unit area is about 4.6×10 −14 or less.

First claim

What is claimed is:

1 . An electrophotographic photoreceptor comprising:
a conductive base; and a single-layer photosensitive layer disposed on the conductive base and containing a binder resin, a hole transport material, an electron transport material, and a charge generation material, wherein when a gold electrode is provided on the photosensitive layer so as to have an electrode area of 9.3×10 −1 cm 2 , and an electric field of 27 V/μm is applied between the gold electrode and the conductive base in an environment at a temperature of 33° C. and a humidity of 80% RH by applying a voltage so that the gold electrode becomes positive, a dark electrical conductivity σ d (1/(Ω·cm)) per unit area is about 4.6×10 −14 or less.

2 . The electrophotographic photoreceptor according to claim 1 , wherein when a gold electrode is provided on the photosensitive layer so as to have an electrode area of 9.3×10 −1 cm 2 , and an electric field of 27 V/μm is applied between the gold electrode and the conductive base in an environment at a temperature of 33° C. and a humidity of 80% RH by applying a voltage so that the gold electrode becomes positive, the dark electrical conductivity σ d (1/(Ω·cm)) per unit area is about 1.0×10 −15 or more and about 2.0×10 −14 or less.

3 . The electrophotographic photoreceptor according to claim 1 , wherein when a gold electrode is provided on the photosensitive layer so as to have an electrode area of 9.3×10 −1 cm 2 , and an electric field of 10 V/μm is applied between the gold electrode and the conductive base in an environment at a temperature of 33° C. and a humidity of 80% RH by applying a voltage so that the gold electrode becomes positive, a dark electrical conductivity σ d (1/(Ω·cm)) per unit area is about 6.0×10 −15 or less.

4 . The electrophotographic photoreceptor according to claim 3 , wherein when a gold electrode is provided on the photosensitive layer so as to have an electrode area of 9.3×10 −1 cm 2 , and an electric field of 10 V/μm is applied between the gold electrode and the conductive base in an environment at a temperature of 33° C. and a humidity of 80% RH by applying a voltage so that the gold electrode becomes positive, the dark electrical conductivity σ d (1/(Ω·cm)) per unit area is about 5.0×10 −17 or more and about 4.5×10 −15 or less.

5 . The electrophotographic photoreceptor according to claim 1 , wherein the electron transport material contains a compound selected from the group consisting of compounds represented by formula (ET-1) and compounds represented by formula (ET-2):

where R 1 to R 6 each independently represent an alkyl group, R 7 and R 8 each independently represent an alkyl group or a halogen atom, and n1 and n2 each independently represent an integer of from 0 to 4.

6 . The electrophotographic photoreceptor according to claim 5 , wherein R 1 and R 3 are each independently an alkyl group having from 3 to 8 carbon atoms.

7 . The electrophotographic photoreceptor according to claim 6 , wherein R 1 and R 3 are each independently a branched alkyl group having from 3 to 8 carbon atoms.

8 . The electrophotographic photoreceptor according to claim 5 , wherein R 2 and R 4 are each independently an alkyl group having from 1 to 8 carbon atoms.

9 . The electrophotographic photoreceptor according to claim 5 , wherein R 5 and R 6 are each independently an alkyl group having from 3 to 8 carbon atoms.

10 . The electrophotographic photoreceptor according to claim 9 , wherein R 5 and R 6 are each independently a branched alkyl group having from 3 to 8 carbon atoms.

11 . The electrophotographic photoreceptor according to claim 1 , wherein the electron transport material contains a compound selected from the group consisting of a compound represented by formula (1) and a compound represented by formula (2).

12 . The electrophotographic photoreceptor according to claim 1 , wherein a content of the electron transport material is about 8% by weight or more and about 20% by weight or less of the total weight of the photosensitive layer.

13 . The electrophotographic photoreceptor according to claim 1 , wherein the hole transport material contains a compound represented by formula (3):

where Ar T1 , Ar T2 , and Ar T3 each independently represent an aryl group or —C 6 H 4 —C(R T4 )═C(R T5 )(R T6 ) where R T4 , R T5 , and R T6 each independently represent a hydrogen atom, an alkyl group, or an aryl group, and R T5 and R T6 may be bonded to each other to form a hydrocarbon ring.

14 . The electrophotographic photoreceptor according to claim 1 , wherein a content of the hole transport material is about 28% by weight or more and about 36% by weight or less of the total weight of the photosensitive layer.

15 . The electrophotographic photoreceptor according to claim 1 , wherein the charge generation material contains at least one compound selected from the group consisting of hydroxygallium phthalocyanine pigments and chlorogallium phthalocyanine pigments.

16 . The electrophotographic photoreceptor according to claim 15 , wherein the charge generation material contains a type V hydroxygallium phthalocyanine pigment.

17 . A process cartridge comprising:
the electrophotographic photoreceptor according to claim 1 , wherein the process cartridge is detachably attachable to an image-forming apparatus.

18 . An image-forming apparatus comprising:
the electrophotographic photoreceptor according to claim 1 ; a charging unit that charges a surface of the electrophotographic photoreceptor; an electrostatic latent image forming unit that forms an electrostatic latent image on the charged surface of the electrophotographic photoreceptor; a developing unit that develops the electrostatic latent image formed on the surface of the electrophotographic photoreceptor with a developer containing a toner to form a toner image; and a transfer unit that transfers the toner image onto a surface of a recording medium.

Assignees

• Fuji Xerox Co Ltd

Inventors

• Yamada Yoshiteru
• Kusano Keisuke

Classifications

• G03G5/047 Primary

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

• G03G5/0696 Primary

  Phthalocyanines · CPC title

• G03G5/14704

  comprising inorganic material · CPC title

• G03G5/0612

  containing nitrogen · CPC title

• G03G5/0525

  Coating methods · CPC title