# US 2024/0201609 A1 · Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

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- Number: US 2024/0201609 A1
- Document ID: US20240201609A1
- Status: Published application
- Kind: A1
- Application number: 18/505,369
- Filed: 2023-11-09
- Published: 2024-06-20
- Earliest claimed: 2022-11-25
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: YUKA ISHIDUKA; FUMIYUKI HIYAMA; AKIRA SAKAKIBARA; TSUTOMU NISHIDA; DAISUKE MIURA
- Web page: https://patentgrep.com/patent/US20240201609A1

## CPC

- G03G 5/14752: {Polyesters}
- C08G 63/185: containing two or more aromatic rings
- C08G 63/193: containing two or more aromatic rings
- C08G 64/06: not containing aliphatic unsaturation
- G03G 5/05: Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers
- G03G 5/056: {Polyesters}
- G03G 5/0564: {Polycarbonates}
- G03G 5/14756: {Polycarbonates}
- G03G 21/1814: {Details of parts of process cartridge, e.g. for charging, transfer, cleaning, developing (G03G21/1835 takes precedence)}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

Provided is an electrophotographic photosensitive member in which streaky image damage can be suppressed throughout long-term use in a low-temperature and low-humidity environment. An electrophotographic photosensitive member having a surface layer comprising a polyarylate and a polycarbonate, wherein the polyarylate has at least one structural unit selected from the group consisting of a structural unit represented by the following formula (1-1), a structural unit represented by the following formula (1-2) and a structural unit represented by the following formula (1-3), and the polycarbonate has a structural unit represented by the following formula (2-1).

## Claims

### Claim 1

An electrophotographic photosensitive member comprising:
a surface layer comprising a polyarylate and a polycarbonate,
wherein the polyarylate has at least one structural unit selected from the group consisting of a structural unit represented by the following formula (1-1), a structural unit represented by the following formula (1-2) and a structural unit represented by the following formula (1-3), and
the polycarbonate has a structural unit represented by the following formula (2-1),

### Claim 2 (depends on 1)

The electrophotographic photosensitive member according to claim 1, wherein the surface layer comprises 5 mol % to 40 mol % of the structural unit represented by the formula (2-1).

### Claim 3 (depends on 1)

The electrophotographic photosensitive member according to claim 1, wherein the polycarbonate comprises 20 mol % to 60 mol % of the structural unit represented by the formula (2-1).

### Claim 4

An electrophotographic photosensitive member comprising:
a surface layer comprising a polyarylate and a polycarbonate,
wherein, in a component analysis of a polymer component collected from the surface layer,
the polyarylate
has a peak for which TIC has an MS spectrum where components with m/z=242 and m/z=227 are detected in pyrolysis gas chromatography-mass spectrometry under the coexistence of TMAH and
has peaks at 2.40±0.02 ppm and 2.35±0.02 ppm in a 1H-NMR spectrum for which heavy chloroform is used, and
the polycarbonate
has a peak for which TIC has an MS spectrum where components with m/z=242 and m/z=227 are detected in pyrolysis gas chromatography-mass spectrometry under the coexistence of TMAH and
has a peak at 2.40±0.02 ppm in a 1H-NMR spectrum for which heavy chloroform is used.

### Claim 5 (depends on 1)

The electrophotographic photosensitive member according to claim 1, wherein the surface layer comprises a silica fine particle.

### Claim 6 (depends on 5)

The electrophotographic photosensitive member according to claim 5, wherein the silica fine particle has a volume-average particle diameter of 0.1 μm to 0.5 μm.

### Claim 7

A process cartridge that integrally supports an electrophotographic photosensitive member and at least one unit selected from the group consisting of a charging unit, a developing unit and a cleaning unit and is detachably attachable to a main body of an electrophotographic apparatus, wherein the electrophotographic photosensitive member has a surface layer comprising a polyarylate and a polycarbonate,
wherein the polyarylate has at least one structural unit selected from the group consisting of a structural unit represented by the following formula (1-1), a structural unit represented by the following formula (1-2) and a structural unit represented by the following formula (1-3), and
wherein the polycarbonate has a structural unit represented by the following formula (2-1),

### Claim 8

A process cartridge that integrally supports an electrophotographic photosensitive member and at least one unit selected from the group consisting of a charging unit, a developing unit and a cleaning unit and is detachably attachable to a main body of an electrophotographic apparatus, wherein the electrophotographic photosensitive member has a surface layer comprising a polyarylate and a polycarbonate,
wherein in a component analysis of a polymer component collected from the surface layer,
the polyarylate
has a peak for which TIC has an MS spectrum where components with m/z=242 and m/z=227 are detected in pyrolysis gas chromatography-mass spectrometry under the coexistence of TMAH and
has peaks at 2.40±0.02 ppm and 2.35±0.02 ppm in a 1H-NMR spectrum for which heavy chloroform is used, and
the polycarbonate
has a peak for which TIC has an MS spectrum where components with m/z=242 and m/z=227 are detected in pyrolysis gas chromatography-mass spectrometry under the coexistence of TMAH and
has a peak at 2.40±0.02 ppm in a 1H-NMR spectrum for which heavy chloroform is used.

### Claim 9

An electrophotographic apparatus comprising:
an electrophotographic photosensitive member;
a charging unit;
an exposure unit;
a developing unit; and
a transfer unit,
wherein the electrophotographic photosensitive member has a surface layer comprising a polyarylate and a polycarbonate,
wherein the polyarylate has at least one structural unit selected from the group consisting of a structural unit represented by the following formula (1-1), a structural unit represented by the following formula (1-2) and a structural unit represented by the following formula (1-3), and
wherein the polycarbonate has a structural unit represented by the following formula (2-1),

### Claim 10

An electrophotographic apparatus comprising:
an electrophotographic photosensitive member;
a charging unit;
an exposure unit;
a developing unit; and
a transfer unit,
wherein the electrophotographic photosensitive member has a surface layer comprising a polyarylate and a polycarbonate,
wherein in a component analysis of a polymer component collected from the surface layer,
the polyarylate
has a peak for which TIC has an MS spectrum where components with m/z=242 and m/z=227 are detected in pyrolysis gas chromatography-mass spectrometry under the coexistence of TMAH and
has peaks at 2.40±0.02 ppm and 2.35±0.02 ppm in a 1H-NMR spectrum for which heavy chloroform is used, and
the polycarbonate
has a peak for which TIC has an MS spectrum where components with m/z=242 and m/z=227 are detected in pyrolysis gas chromatography-mass spectrometry under the coexistence of TMAH and
has a peak at 2.40±0.02 ppm in a 1H-NMR spectrum for which heavy chloroform is used.