Electrophotographic photoreceptor, process cartridge, and image forming apparatus

• US 10,642,173 B1
• Filed: 04/16/2019
• Issued: 05/05/2020
• Est. Priority Date: 12/21/2018
• Status: Active Grant

• Current Assignee: Fujifilm Business Innovation Corp. (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Xerox Company Limited (Fujifilm Holdings Corporation)
• Inventors: Iwasaki, Masahiro, Maki, Kota, Kajiwara, Kenji, Yamada, Wataru
• Primary Examiner(s): Rodee, Christopher D
• Application Number:
  US16/385,032
• Time in Patent Office: 385 Days
• CPC Class Codes: G03G 5/0575 Other polycondensates comprising nitrogen atoms with or without oxygen atoms in the main chain
• CPC Class Codes: G03G 5/0609 containing oxygen
• CPC Class Codes: G03G 5/06142 arylamine
• CPC Class Codes: G03G 5/0659 containing more than seven relevant rings
• CPC Class Codes: G03G 5/0672 containing two or more methine or polymethine groups
• CPC Class Codes: G03G 5/0696 Phthalocyanines
• CPC Class Codes: G03G 5/142 Inert intermediate layers
• CPC Class Codes: G03G 5/144 comprising inorganic material

Abstract

An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer on the conductive substrate, and a photosensitive layer on the undercoat layer. The undercoat layer contains at least one perinone compound selected from the group consisting of a compound represented by general formula (1) below and a compound represented by general formula (2) below, an amine compound (A) having an ionization potential of 5.4 eV or more and 5.9 eV or less, and a binder resin,

where: in general formula (1), R¹¹, R¹², R¹³, R¹⁴, R¹⁵, R¹⁶, R¹⁷, and R¹⁸ each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aralkyl group, an aryl group, an aryloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkoxycarbonylalkyl group, an aryloxycarbonylalkyl group, or a halogen atom; R¹¹ and R¹² may be bonded to each other to form a ring, so may R¹² and R¹³, and so may R¹³ and R¹⁴; and R¹⁵ and R¹⁶ may be bonded to each other to form a ring, so may R¹⁶ and R¹⁷, and so may R¹⁷ and R¹⁸, and in general formula (2), R²¹, R²², R²³, R²⁴, R²⁵, R²⁶, R²⁷, and R²⁸ each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aralkyl group, an aryl group, an aryloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkoxycarbonylalkyl group, an aryloxycarbonylalkyl group, or a halogen atom; R²¹ and R²² may be bonded to each other to form a ring, so may R²² and R²³, and so may R²³ and R²⁴; and R²⁵ and R²⁶ may be bonded to each other to form a ring, so may R²⁶ and R²⁷, and so may R²⁷ and R²⁸.

Claims

1. An electrophotographic photoreceptor comprising:

a conductive substrate;

an undercoat layer on the conductive substrate; and

a photosensitive layer on the undercoat layer,

wherein the undercoat layer contains;

at least one perinone compound selected from the group consisting of a compound represented by general formula (1) below and a compound represented by general formula (2) below,

an amine compound (A) having an ionization potential of 5.4 eV or more and 5.9 eV or less, wherein an amount of the amine compound (A) contained relative to a total solid content of the undercoat layer is 0.01 mmol/g or more and 1 mmol/g or less, and

a binder resin,

2. The electrophotographic photoreceptor according to claim 1, wherein the ionization potential of the amine compound (A) is 5.5 eV or more and 5.8 eV or less.

3. The electrophotographic photoreceptor according to claim 1, wherein the amount of the amine compound (A) is 0.05 mmol/g or more and 0.9 mmol/g or less.

4. The electrophotographic photoreceptor according to claim 3, wherein the amount of the amine compound (A) is 0.1 mmol/g or more and 0.8 mmol/g or less.

5. The electrophotographic photoreceptor according to claim 1, wherein the photosensitive layer contains a phthalocyanine pigment as a charge generating material.

6. The electrophotographic photoreceptor according to claim 5, wherein the phthalocyanine pigment contains at least one selected from the group consisting of chlorogallium phthalocyanine and hydroxygallium phthalocyanine.

7. The electrophotographic photoreceptor according to claim 1, wherein the binder resin contains polyurethane.

8. The electrophotographic photoreceptor according to claim 7, wherein a mass ratio of a total amount of the compounds represented by formulae (1) and (2) contained in the undercoat layer to an amount of the polyurethane contained in the undercoat layer is from 90:

10 to 50;

50.

9. The electrophotographic photoreceptor according to claim 7, wherein a mass ratio of a total amount of the compounds represented by formulae (1) and (2) contained in the undercoat layer to an amount of the polyurethane contained in the undercoat layer is from 80:

20 to 70;

30.

10. The electrophotographic photoreceptor according to claim 1, wherein a total amount of the at least one perinone compound relative to a total solid content of the undercoat layer is 30 mass % or more.

11. The electrophotographic photoreceptor according to claim 1, wherein a total amount of the at least one perinone compound relative to a total solid content of the undercoat layer is 30 mass % or more and 90 mass % or less.

12. The electrophotographic photoreceptor according to claim 1, wherein a total amount of the at least one perinone compound relative to a total solid content of the undercoat layer is 40 mass % or more and 80 mass % or less.

13. The electrophotographic photoreceptor according to claim 1, wherein a total amount of the at least one perinone compound relative to a total solid content of the undercoat layer is 50 mass % or more and 75 mass % or less.

14. The electrophotographic photoreceptor according to claim 1, wherein the undercoat layer further contains at least one type of metal oxide particles selected from the group consisting of zinc oxide particles, titanium oxide particles, and tin oxide particles.

15. A process cartridge detachably attachable to an image forming apparatus, the process cartridge comprising the electrophotographic photoreceptor according to claim 1.

16. 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 on the surface of the electrophotographic photoreceptor by using a developer containing a toner so as to form a toner image; and

a transfer unit that transfers the toner image onto a surface of a recording medium.