Electrophotographic photosensitive member, production method of electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

Patent metadata

Field	Value
Publication number	US-10365569-B2
Application number	US-201816053905-A
Country	US
Kind code	B2
Filing date	Aug 3, 2018
Priority date	Aug 10, 2017
Publication date	Jul 30, 2019
Grant date	Jul 30, 2019

Abstract

The present invention provides: an electrophotographic photosensitive member which can achieve both of abrasion resistance and electrical characteristics; a production method of the electrophotographic photosensitive member; and a process cartridge and an electrophotographic apparatus having the electrophotographic photosensitive member. A surface layer of the electrophotographic photosensitive member includes a cured product and a specific amount of an alcohol or carboxylic acid having a specific structure, wherein the cured product is a polymerized product of a hole transporting compound having an acryloyloxy group or a methacryloyloxy group.

First claim

What is claimed is:

1. An electrophotographic photosensitive member having a support, a charge generation layer, a charge transport layer and a surface layer in the listed order, wherein
the surface layer comprises a cured product and a compound represented by formula (1) or (2):
H 3 C—(CH 2 ) a —COOH  (1)

H 3 C—(CH 2 ) b —OH  (2)

wherein in the formula (1), a is an integer of 6 or more; and in the formula (2), b is an integer of 6 or more;
the cured product is a polymerized product of a hole transporting compound having an acryloyloxy group or a methacryloyloxy group; and
the compound represented by the formula (1) or (2) is contained in an amount of 50 to 4000 ppm with respect to the hole transporting compound having an acryloyloxy group or a methacryloyloxy group.

2. The electrophotographic photosensitive member according to claim 1 , wherein
the surface layer comprises a cured product and the compound represented by the formula (1);
the cured product is a copolymerized product of a hole transporting compound having an acryloyloxy group or a methacryloyloxy group, and a compound represented by the following formula (3); and
the compound represented by the formula (1) is contained in an amount of 50 to 4000 ppm with respect to the hole transporting compound having an acryloyloxy group or a methacryloyloxy group:

wherein in the formula (3), R 1 is a hydrogen atom or a methyl group, and c is an integer of 6 or more.

3. The electrophotographic photosensitive member according to claim 1 , wherein
the surface layer comprises a cured product and the compound represented by the formula (2);
the cured product is a copolymerized product of a hole transporting compound having an acryloyloxy group or a methacryloyloxy group, and a compound represented by the following formula (4); and
the compound represented by the formula (2) is contained in an amount of 50 to 4000 ppm with respect to the hole transporting compound having an acryloyloxy group or a methacryloyloxy group:

wherein in the formula (4), R 2 is a hydrogen atom or a methyl group, and d is an integer of 6 or more.

4. The electrophotographic photosensitive member according to claim 3 , wherein b in the formula (2) is an integer of 12 or more.

5. The electrophotographic photosensitive member according to claim 4 , wherein the charge transport layer comprises a compound represented by the following formula (10):

6. The electrophotographic photosensitive member according to claim 3 , wherein
the surface layer comprises a cured product and the compound represented by the formula (2);
the cured product is a copolymerized product of a hole transporting compound having an acryloyloxy group or a methacryloyloxy group, the compound represented by the formula (4), and a compound represented by the following formula (5) or the following formula (6); and
the compound represented by the formula (2) is contained in an amount of 50 to 4000 ppm with respect to the hole transporting compound having an acryloyloxy group or a methacryloyloxy group:

wherein in the formula (5), R 3 is a hydrogen atom or a methyl group, and X is an alkylene group having 13 or less carbon atoms; and in the formula (6), R 4 is a hydrogen atom or a methyl group.

7. The electrophotographic photosensitive member according to claim 6 , wherein X in the formula (5) is an alkylene group represented by the following formula (7):

wherein in the formula (7), * represents a linking group.

8. The electrophotographic photosensitive member according to claim 3 , wherein the surface layer comprises a cured product and the compound represented by the formula (2);
the cured product is a copolymerized product of a hole transporting compound having an acryloyloxy group or a methacryloyloxy group represented by the following formula (8), and the compound represented by the formula (4); and
the compound represented by the formula (2) is contained in an amount of 50 to 4000 ppm with respect to the hole transporting compound having an acryloyloxy group or a methacryloyloxy group:

wherein in the formula (8), Ar 1 is a phenyl group substituted with a hydroxyl group or a hydroxyalkyl group, Ar 2 is a phenyl group substituted with an acryloyloxy group or a methacryloyloxy group, and Ar 3 is a phenyl group which is unsubstituted or is substituted with an alkyl group.

9. The electrophotographic photosensitive member according to claim 8 , wherein the hole transporting compound having an acryloyloxy group or a methacryloyloxy group represented by the formula (8) is a hole transporting compound having an acryloyloxy group or a methacryloyloxy group represented by the following formula (9):

wherein in the formula (9), R 5 is a hydrogen atom or a methyl group, Ar 4 is a phenyl group or a tolyl group, and e is an integer of 1 or more.

10. A production method of an electrophotographic photosensitive member having a support, a charge generation layer, a charge transport layer and a surface layer in the listed order,
the production method comprising:
preparing a coating liquid for a surface layer, which contains a hole transporting compound having an acryloyloxy group or a methacryloyloxy group, and a compound represented by formula (1) or (2) in an amount of 50 to 4000 ppm based on a total solid content in the coating liquid:
H 3 C—(CH 2 ) a —COOH  (1)

H 3 C—(CH 2 ) b —OH  (2)

wherein in the formula (1), a is an integer of 6 or more; and in the formula (2), b is an integer of 6 or more;
forming a coating film of the coating liquid for the surface layer; and
curing the coating film to thereby form the surface layer of the electrophotographic photosensitive member.

11. A process cartridge integrally supporting an electrophotographic photosensitive member having a support, a charge generation layer, a charge transport layer and a surface layer in the listed order, with at least one unit selected from the group consisting of a charging unit, a developing unit, a transfer unit and a cleaning unit, and being detachably attachable to a main body of an electrophotographic apparatus,
wherein
the surface layer comprises a cured product and a compound represented by formula (1) or (2):
H 3 C—(CH 2 ) a —COOH  (1)

H 3 C—(CH 2 ) b —OH  (2)

wherein in the formula (1), a is an integer of 6 or more; and in the formula (2), b is an integer of 6 or more;
the cured product is a polymerized product of a hole transporting compound having an acryloyloxy group or a methacryloyloxy group; and
the compound represented by the formula (1) or (2) is contained in an amount of 50 to 4000 ppm with respect to the hole transporting compound having an acryloyloxy group or a methacryloyloxy group.

12. An electrophotographic apparatus comprising: an electrophotographic photosensitive member having a support, a charge generation layer, a charge transport layer and a surface layer in the listed order; an

Assignees

• Canon Kk

Inventors

• Tokimitsu Ryoichi
• Nonaka Masaki
• Mori Haruki
• Mitsui Takahiro

Classifications

• G03G5/14734

  Polymers comprising at least one carboxyl radical, e.g. polyacrylic acid, polycrotonic acid, polymaleic acid; Derivatives thereof, e.g. their esters, salts, anhydrides, nitriles, amides · CPC title

• G03G5/0525

  Coating methods · CPC title

• G03G5/147

  Cover layers · CPC title

• G03G5/14708

  comprising organic material · CPC title

• G03G5/0601

  Acyclic or carbocyclic compounds · CPC title