Electrophotographic photosensitive member

Patent metadata

Field	Value
Publication number	US-10372048-B2
Application number	US-201816035859-A
Country	US
Kind code	B2
Filing date	Jul 16, 2018
Priority date	Jul 21, 2017
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

Abstract

An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer includes a charge generating layer and a charge transport layer. The charge generating layer contains a charge generating material. The charge transport layer contains a hole transport material and a binder resin. The charge transport layer further contains an electron acceptor compound. The hole transport material includes a compound represented by general formula (1). In general formula (1), R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , and R 10 each represent, independently of one another, a hydrogen atom or a methyl group.

First claim

What is claimed is:

1. An electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer, wherein
the photosensitive layer includes a charge generating layer and a charge transport layer,
the charge generating layer contains a charge generating material,
the charge transport layer contains a hole transport material and a binder resin,
the charge transport layer further contains an electron acceptor compound, and
the hole transport material includes only a compound represented by a chemical formula (1-2),

2. The electrophotographic photosensitive member according to claim 1 , wherein
a ratio of a mass of the hole transport material to a mass of the binder resin is at least 0.50.

3. The electrophotographic photosensitive member according to claim 1 , wherein
the binder resin includes a polyarylate resin, and
the polyarylate resin includes at least one repeating unit represented by a general formula (10), a repeating unit represented by a chemical formula (11-X1), and at least one repeating unit represented by a general formula (11′)

where in the general formula (10),
R 11 and R 12 each represent, independently of each other, a hydrogen atom or a methyl group, and
R 13 represents a hydrogen atom or an alkyl group having a carbon number of at least 1 and no greater than 4 and R 14 represents an alkyl group having a carbon number of at least 1 and no greater than 4, or R 13 and R 14 bond together to represent a cycloalkylidene group having a carbon number of at least 5 and no greater than 14, and

X′ in the general formula (11′) represents a divalent group represented by a chemical formula (X2), (X3), (X4), (X5) or (X6)

4. The electrophotographic photosensitive member according to claim 1 , wherein
the binder resin includes a polyarylate resin, and
the polyarylate resin is
a polyarylate resin including repeating units represented by chemical formulas (10-1), (11-X1), and (11-X3),

a polyarylate resin including repeating units represented by a chemical formula (10-2), the chemical formula (11-X1), and the chemical formula (11-X3),

a polyarylate resin including repeating units represented by the chemical formula (10-2), the chemical formula (11-X1), and a chemical formula (11-X2), or

a polyarylate resin including repeating units represented by a chemical formula (10-3), the chemical formula (11-X1), and the chemical formula (11-X3)

5. The electrophotographic photosensitive member according to claim 1 , wherein
the binder resin includes a polycarbonate resin, and
the polycarbonate resin includes a repeating unit represented by a chemical formula (R-5) or (R-6)

6. The electrophotographic photosensitive member according to claim 1 , wherein
a ratio of a mass of the electron acceptor compound to a mass of the hole transport material is at least 0.01 and no greater than 0.30.

7. The electrophotographic photosensitive member according to claim 1 , wherein
the electron acceptor compound includes a compound represented by a general formula (20), (21), (22), (23), or (24),

where in the general formula (20), Q 1 , Q 2 , Q 3 , and Q 4 each represent, independently of one another, an alkyl group having a carbon number of at least 1 and no greater than 6, an alkoxy group having a carbon number of at least 1 and no greater than 6, a cycloalkyl group having a carbon number of at least 5 and no greater than 7, or an aryl group having a carbon number of at least 6 and no greater than 14,
in the general formula (21), Q 11 and Q 12 each represent, independently of each other, an alkyl group having a carbon number of at least 1 and no greater than 6, an alkoxy group having a carbon number of at least 1 and no greater than 6, a cycloalkyl group having a carbon number of at least 5 and no greater than 7, or an aryl group having a carbon number of at least 6 and no greater than 14,
in the general formula (22), Q 21 and Q 22 each represent, independently of each other, an aryl group having a carbon number of at least 6 and no greater than 14 and optionally having an alkyl group having a carbon number of at least 1 and no greater than 6 or an alkoxy group having a carbon number of at least 1 and no greater than 6,
in the general formula (23), Q 31 represents an alkoxycarbonyl group having a carbon number of at least 2 and no greater than 7, and
in the general formula (24), Q 41 and Q 42 each represent, independently of each other, an alkyl group having a carbon number of at least 1 and no greater than 6, and Q 43 represents a halogen atom.

8. The electrophotographic photosensitive member according to claim 1 , wherein
the electron acceptor compound includes a compound represented by a chemical formula (20-E1), (20-E2), (21-E3), (22-E4), (23-E5), or (24-E6)

9. The electrophotographic photosensitive member according to claim 1 , wherein
the binder rein includes a polyarylate resin, and
the polyarylate resin includes at least one repeating unit represented by a general formula (10), a repeating unit represented by a chemical formula (11-X1), and at least one repeating unit represented by a general formula (11′),

where in the general formula (10),
R 11 and R 12 each represent, independently of each other, a hydrogen atom or a methyl group, and
R 13 represents a hydrogen atom or an alkyl group having a carbon number of at least 1 and no greater than 4 and R 14 represents an alkyl group having a carbon number of at least 1 and no greater than 4, or R 13 and R 14 bond together to represent a cycloalkylidene group having a carbon number of at least 5 and no greater than 14, and

X′ in the general formula (11′) represents a divalent group represented by a chemical formula (X2),

10. The electrophotographic photosensitive member according to claim 9 , wherein
the polyarylate resin includes repeating units represented by chemical formulas (10-2), (11-X1), and (11-X2),

11. The electrophotographic photosensitive member according to claim 1 , wherein
the binder rein includes a polycarbonate resin, and
the polycarbonate resin includes only a repeating unit represented by a chemical formula (R-6) as a repeating unit,

Assignees

• Kyocera Document Solutions Inc

Inventors

• Azuma Jun
• Kojima Kensuke
• Shimizu Tomofumi

Classifications

• G03G5/0677

  Monoazo dyes · CPC title

• G03G5/0564

  Polycarbonates · CPC title

• G03G5/056

  Polyesters · CPC title

• G03G5/0651

  containing four relevant rings · CPC title

• G03G5/0614

  Amines · CPC title