Electrophotographic photosensitive member, process cartridge, and image forming apparatus

Patent metadata

Field	Value
Publication number	US-10761440-B2
Application number	US-201716345495-A
Country	US
Kind code	B2
Filing date	Aug 24, 2017
Priority date	Oct 28, 2016
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

A photosensitive member ( 1 ) includes a conductive substrate ( 2 ) and a photosensitive layer ( 3 ). The photosensitive layer is a single-layer photosensitive layer ( 3 c ). The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The hole transport material includes a triphenylamine derivative represented by general formula (HT). The electron transport material includes a compound represented by general formula (ET1), (ET2), (ET3), (ET4), or (ET5). The binder resin includes a polyarylate resin represented by general formula (1)

First claim

The invention claimed is:

1. An electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer, wherein
the photosensitive layer is a single-layer photosensitive layer,
the photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin,
the hole transport material includes a triphenylamine derivative,
the triphenylamine derivative is represented by a general formula (HT) shown below,
the electron transport material includes a compound represented by a general formula (ET1), a general formula (ET2), a general formula (ET3), a general formula (ET4), or a general formula (ET5) shown below,
the binder resin includes only a polyarylate resin, and
the polyarylate resin is represented by a general formula (1) shown below,

in the general formula (1),
r and s represent an integer of at least 0 and no greater than 49,
t and u represent an integer of at least 1 and no greater than 50,
r+s+t+u=100,
r+t=s+u,
r and t may be the same as or different from each other,
s and u may be the same as or different from each other,
kr represents 3,
kt represents 3,
X and Y each represent, independently of one another, a divalent group represented by a chemical formula (2A), a chemical formula (2C), a chemical formula (2D), a chemical formula (2E), a chemical formula (2F), or a chemical formula (2G) shown below, and
X and Y differ from each other,

in the general formula (HT),
R 1 , R 2 , and R 3 each represent, independently of one another, an alkyl group having a carbon number of at least 1 and no greater than 4 or an alkoxy group having a carbon number of at least 1 and no greater than 4,
k, p, and q each represent, independently of one another, an integer of at least 0 and no greater than 5,
m1 and m2 each represent, independently of one another, an integer of at least 1 and no greater than 3,
when k represents an integer of at least 2, plural chemical groups represented by R 1 may be the same as or different from one another,
when p represents an integer of at least 2, plural chemical groups represented by R 2 may be the same as or different from one another, and
when q represents an integer of at least 2, plural chemical groups represented by R 3 may be the same as or different from one another,

in the general formula (ET1),
R 11 and R 12 represent an alkyl group having a carbon number of at least 1 and no greater than 6,
in the general formula (ET2),
R 13 , R 14 , R 15 , and R 16 represent an alkyl group having a carbon number of at least 1 and no greater than 6,
in the general formula (ET3),
R 17 and R 18 each represent, independently of one another, an aryl group having a carbon number of at least 6 and no greater than 14 and optionally having one or more alkyl groups having a carbon number of at least 1 and no greater than 3,
in the general formula (ET4),
R 19 and R 20 represent an alkyl group having a carbon number of at least 1 and no greater than 6, and
R 21 represents an aryl group having a carbon number of at least 6 and no greater than 14 and optionally having one or more halogen atoms, and
in the general formula (ET5),
R 22 , R 23 , R 24 , and R 25 represent an alkyl group having a carbon number of at least 1 and no greater than 6.

2. The electrophotographic photosensitive member according to claim 1 , wherein
in the general formula (1),
s/(s+u) is at least 0.30 and no greater than 0.70.

3. The electrophotographic photosensitive member according to claim 1 , wherein
the polyarylate resin is represented by a chemical formula (R-1), a chemical formula (R-2), a chemical formula (R-3), a chemical formula (R-4), a chemical formula (R-5), a chemical formula (R-6), a chemical formula (R-7), a chemical formula (R-8), a chemical formula (R-9), a chemical formula (R-10), or a chemical formula (R-11) shown below,

4. The electrophotographic photosensitive member according to claim 1 , wherein
in the general formula (HT),
R 1 represents a chemical group selected from the group consisting of alkoxy groups having a carbon number of at least 1 and no greater than 4 and alkyl groups having a carbon number of at least 1 and no greater than 4,
k represents 1 or 2,
when k represents 2, two chemical groups R 1 may be the same as or different from each other,
p and q represent 0, and
m1 and m2 represent 2 or 3.

5. The electrophotographic photosensitive member according to claim 1 , wherein
in the general formula (HT),
R 1 represents an alkyl group having a carbon number of at least 1 and no greater than 4, and
k represents 2.

6. The electrophotographic photosensitive member according to claim 1 , wherein
in the general formula (HT),
m1 and m2 represent 3.

7. The electrophotographic photosensitive member according to claim 1 , wherein
the triphenylamine derivative is represented by a chemical formula (HT-1), a chemical formula (HT-2), a chemical formula (HT-3), a chemical formula (HT-4), a chemical formula (HT-5), a chemical formula (HT-6), or a chemical formula (HT-7) shown below,

8. The electrophotographic photosensitive member according to claim 1 , wherein
in the general formula (ET1),
R 11 and R 12 represent an alkyl group having a carbon number of at least 1 and no greater than 5,
in the general formula (ET2),
R 13 , R 14 , R 15 , and R 16 represent an alkyl group having a carbon number of at least 1 and no greater than 4,
in the general formula (ET3),
R 17 and R 18 represent a phenyl group having plural alkyl groups having a carbon number of at least 1 and no greater than 2,
in the general formula (ET4),
R 19 and R 20 represent an alkyl group having a carbon number of at least 1 and no greater than 4, and
R 21 represents an phenyl group having a halogen atom, and
in the general formula (ET5),
R 22 , R 23 , R 24 , and R 25 represent an alkyl group having a carbon number of at least 1 and no greater than 4.

9. The electrophotographic photosensitive member according to claim 1 , wherein
the electron transport material is the compound represented by the general formula (ET5).

10. The electrophotographic photosensitive member according to claim 1 , wherein
the electron transport material is represented by a chemical formula (ET1-1), a chemical formula (ET2-1), a chemical formula (ET3-1), a chemical formula (ET4-1), or a chemical formula (ET5-1) shown below,

11. The electrophotographic photosensitive member according to claim 1 , wherein
the charge generating material is an X-form metal-free phthalocyanine pigment or a Y-form titanyl phthalocyanine pigment.

Assignees

• Kyocera Document Solutions Inc

Inventors

• Tsurumi Hiroki
• Miyamoto Eiichi
• Azuma Jun

Classifications

• G03G5/061473 Primary

  plural alkenyl groups linked directly to the same aryl group · CPC title

• G03G5/056 Primary

  Polyesters · CPC title

• G03G5/0672

  containing two or more methine or polymethine groups · CPC title

• G03G15/75

  Details relating to xerographic drum, band or plate, e.g. replacing, testing (electrographic recording members per se G03G5/00) · CPC title

• G03G21/18

  using a processing cartridge {, whereby the process cartridge comprises at least two image processing means in a single unit} · CPC title