Electrophotographic photosensitive member, process cartridge, and electrophotographic image-forming apparatus

Patent metadata

Field	Value
Publication number	US-10539892-B2
Application number	US-201916423393-A
Country	US
Kind code	B2
Filing date	May 28, 2019
Priority date	May 31, 2018
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

Provided is an electrophotographic photosensitive member that is reduced in exposure memory and is excellent in electrical characteristics and durability. The electrophotographic photosensitive member includes in this order: a support; a photosensitive layer; and a protective layer, wherein the protective layer contains a resin having a structure represented by the following general formula (1) and a structure represented by the following general formula (2).

First claim

What is claimed is:

1. An electrophotographic photosensitive member comprising in this order:
a support;
a photosensitive layer; and
a protective layer,
wherein the protective layer contains a resin having a structure represented by the following general formula (1) and a structure represented by the following general formula (2):

in the formula (1), R 1 represents an alkylene group or phenylene group that may have a substituent, and R 2 to R 7 each independently represent a hydrogen atom, a methyl group, or an ethyl group;

in the formula (2), R 11 represents an alkylene group or phenylene group that may have a substituent, and R 12 to R 17 each independently represent a hydrogen atom, a methyl group, or an ethyl group.

2. The electrophotographic photosensitive member according to claim 1 , wherein a molar ratio of the structure represented by the general formula (1) to the structure represented by the general formula (2) is 0.05 or more and 0.70 or less.

3. The electrophotographic photosensitive member according to claim 1 , wherein the protective layer contains the resin further having a structure represented by the following general formula (3):

in the formula (3), A represents an organic group, R 20 s each independently represent a hydrogen atom or a methyl group, and “n” represents an integer of 2 or more and 6 or less.

4. The electrophotographic photosensitive member according to claim 1 , wherein a ratio of a total mass of structural units each having a charge-transporting ability to a mass of an entirety of the protective layer is 0.4 or more and 1.0 or less, and a ratio of a total mass of the structural units represented by the general formulae (1) and (2) to the total mass of the structural units each having a charge-transporting ability is 0.1 or more and 1.0 or less.

5. The electrophotographic photosensitive member according to claim 1 , wherein R 7 in the general formula (1) represents a hydrogen atom, and R 17 in the general formula (2) represents a hydrogen atom.

6. The electrophotographic photosensitive member according to claim 3 , wherein the structure represented by the general formula (3) comprises a structure represented by the following general formula (31):

in the formula (31), R 21 and R 22 each independently represent an alkylene group that may have a substituent, and R 23 to R 28 each independently represent a hydrogen atom or a methyl group.

7. The electrophotographic photosensitive member according to claim 1 , wherein R 1 in the general formula (1) and R 11 in the general formula (2) each independently represent an alkylene group having 2 or more and 5 or less carbon atoms.

8. An electrophotographic photosensitive member comprising in this order:
a support;
a photosensitive layer; and
a protective layer,
wherein the protective layer contains a polymer of a composition containing a polymerizable compound represented by the following general formula (1A) and a polymerizable compound represented by the following general formula (2A):

in the formula (1A), R 1 represents an alkylene group or phenylene group that may have a substituent, and R 2 to R 7 each independently represent a hydrogen atom, a methyl group, or an ethyl group;

in the formula (2A), R 11 represents an alkylene group or phenylene group that may have a substituent, and R 12 to R 17 each independently represent a hydrogen atom, a methyl group, or an ethyl group.

9. A process cartridge comprising:
the electrophotographic photosensitive member; and
at least one unit selected from the group consisting of a charging unit, a developing unit, and a cleaning unit,
the process cartridge integrally supporting the electrophotographic photosensitive member and the at least one unit, and being removably mounted onto a main body of an electrophotographic image-forming apparatus
wherein the electrophotographic photosensitive member comprises in this order:
a support;
a photosensitive layer; and
a protective layer,
wherein the protective layer contains a resin having a structure represented by the following general formula (1) and a structure represented by the following general formula (2):

in the formula (1), R 1 represents an alkylene group or phenylene group that may have a substituent, and R 2 to R 7 each independently represent a hydrogen atom, a methyl group, or an ethyl group;

in the formula (2), R 11 represents an alkylene group or phenylene group that may have a substituent, and R 12 to R 17 each independently represent a hydrogen atom, a methyl group, or an ethyl group.

10. An electrophotographic image-forming apparatus comprising:
the electrophotographic photosensitive member; and
at least one unit selected from the group consisting of a charging unit, an exposing unit, a developing unit, and a transferring unit
wherein the electrophotographic photosensitive member comprises in this order:
a support;
a photosensitive layer; and
a protective layer,
wherein the protective layer contains a resin having a structure represented by the following general formula (1) and a structure represented by the following general formula (2):

in the formula (1), R 1 represents an alkylene group or phenylene group that may have a substituent, and R 2 to R 7 each independently represent a hydrogen atom, a methyl group, or an ethyl group;

in the formula (2), R 11 represents an alkylene group or phenylene group that may have a substituent, and R 12 to R 17 each independently represent a hydrogen atom, a methyl group, or an ethyl group.

Assignees

• Canon Kk

Inventors

• Nishida Tsutomu
• Ishiduka Yuka
• Kaku Kenichi
• Nakamura Nobuhiro
• Watanabe Hiroyuki
• Shimozawa Hideharu
• Okuda Atsushi

Classifications

• G03G5/0618

  containing oxygen and nitrogen · CPC title

• C08L33/14

  of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen · CPC title

• G03G5/1473

  Polyvinylalcohol, polyallylalcohol; Derivatives thereof, e.g. polyvinylesters, polyvinylethers, polyvinylamines · CPC title

• 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

• G03G5/14795

  Macromolecular compounds characterised by their physical properties · CPC title