ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS

• US 20140212800A1
• Filed: 01/21/2014
• Published: 07/31/2014
• Est. Priority Date: 01/28/2013
• Status: Abandoned Application

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Miura, Daisuke, Tanaka, Daisuke, Sugiyama, Kazumichi
• Application Number:
  US14/160,437
• Publication Number:
  US 20140212800A1
• Time in Patent Office: Days
• US Class Current: 430/56
• CPC Class Codes: G03G 5/047 characterised by the charge-generation layers or charge transport layers G03G5/0433 and G03G5/0436 take precedence
• CPC Class Codes: G03G 5/051 Organic non-macromolecular compounds
• CPC Class Codes: G03G 5/0517 comprising one or more cyclic groups consisting of carbon-atoms only
• CPC Class Codes: G03G 5/056 Polyesters
• CPC Class Codes: G03G 5/0564 Polycarbonates
• CPC Class Codes: G03G 5/061443 benzidine
• CPC Class Codes: G03G 5/061473 plural alkenyl groups linked directly to the same aryl group
• CPC Class Codes: G03G 5/06149 enamine
• CPC Class Codes: G03G 5/0616 Hydrazines; Hydrazones
• CPC Class Codes: G03G 5/0666 containing a methine or polymethine group
• CPC Class Codes: G03G 5/0668 containing only one methine or polymethine group
• CPC Class Codes: G03G 5/0672 containing two or more methine or polymethine groups

Abstract

An electrophotographic photosensitive member, wherein a charge transporting layer is a surface layer, the charge transporting layer contains a specified charge transportable compound and a specified binder resin, and the charge transporting layer satisfies the following expression (4-1).

X_P1<X_P5  (4-1)

Claims

1. An electrophotographic photosensitive member comprising:

a support;

a charge generating layer formed on the support; and

a charge transporting layer formed on the charge generating layer;

wherein

the charge transporting layer is a surface layer of the electrophotographic photosensitive member,

the charge transporting layer comprises;

at least one charge transporting substance selected from the group consisting of a compound represented by the following formula (2) and a compound represented by the following formula (3); and

at least one binder resin selected from the group consisting of a polycarbonate resin having a structural unit represented by the following formula (IA) and a polyester resin having a structural unit represented by the following formula (IB); and

the charge transporting layer satisfies the following expression (4-1);

X_P1<

X_P5 

 

(4-1)

wherein,

X_P1 represents the mass ratio (D/B) of the charge transporting substance (D) to the binder resin (B) based on IR spectroscopy measured at P1,

X_P5 represents the mass ratio (D/B) of the charge transporting substance (D) to the binder resin (B) based on IR spectroscopy measured at P5,

P1 is the position on the surface of the charge transporting layer, and

P5 is the position where the distance from the surface of the charge transporting layer is 4T/5 when the thickness of the charge transporting layer is designated as T;

2. The electrophotographic photosensitive member according to claim 1,

wherein the charge transporting layer satisfies the following expressions (4-2) to (4-5):

X_P1<

X_P2 

 

(4-2)

X_P2<

X_P3 

 

(4-3)

X_P3<

X_P4 

 

(4-4)

X_P4<

X_P5 

 

(4-5)

wherein,

X_P2 represents the mass ratio (D/B) of the charge transporting substance (D) to the binder resin (B) based on IR spectroscopy measured at P2,

X_P3 represents the mass ratio (D/B) of the charge transporting substance (D) to the binder resin (B) based on IR spectroscopy measured at P3,

X_P4 represents the mass ratio (D/B) of the charge transporting substance (D) to the binder resin (B) based on IR spectroscopy measured at P4,

P2 is the position where the distance from the surface of the charge transporting layer is T/5 when the thickness of the charge transporting layer is designated as T,

P3 is the position where the distance from the surface of the charge transporting layer is 2T/5 when the thickness of the charge transporting layer is designated as T, and

P4 is the position where the distance from the surface of the charge transporting layer is 3T/5 when the thickness of the charge transporting layer is designated as T.

3. The electrophotographic photosensitive member according to claim 2,

wherein the charge transporting layer further satisfies the following expression (5):

0.020≦

(X_Pm+1−

X_Pm)/(mT/5−

(m−

1)T/5)≦

0.060 

 

(5)

wherein, m is an integer of 1 to 4.

4. The electrophotographic photosensitive member according to claim 1, wherein the charge transporting substance is the compound represented by the formula (3).

5. The electrophotographic photosensitive member according to claim 1, wherein the thickness of the charge transporting layer is 10 μ

m or more and 35 μ

m or less.

6. The electrophotographic photosensitive member according to claim 1, wherein the charge transporting substance is a compound represented by the following formula (CTM-2) or (CTM-3).

7. A process cartridge detachably attachable to a main body of an electrophotographic apparatus, wherein the process cartridge integrally supports:

the electrophotographic photosensitive member according to claim 1, and

at least one device selected from the group consisting of a charging device, a developing device, a transferring device and a cleaning device.

8. An electrophotographic apparatus comprising an electrophotographic photosensitive member according to claim 1, a charging device, an exposure device, a developing device and a transfer device.