JPH09138516A - Electrophotographic photoreceptor - Google Patents

Abstract

(57) [Summary] (Correction) [PROBLEMS] To provide an electrophotographic photoreceptor having high sensitivity and extremely stable electrostatic characteristics even when repeatedly used. SOLUTION: The particle size distribution is 0.1 on the conductive support.
A single layer containing a charge generating substance consisting of 60 vol% or more of phthalocyanine compound (1) having a thickness of at least μm and less than 0.5 μm, or an organic acceptor compound represented by the following general formula (2), and a binder resin. An electrophotographic photosensitive member provided with the photosensitive layer of.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-layer type electrophotographic photosensitive member used in copying machines, printers and the like.

[0002]

2. Description of the Related Art Inorganic substances such as selenium, cadmium sulfide, and zinc oxide have been known as photoconductive materials for electrophotographic photoreceptors. However, these inorganic substances are not always satisfactory in the photosensitivity, thermal stability, durability and other characteristics required for electrophotographic photoreceptors, and in manufacturing conditions. For example, selenium has the drawbacks that it is easily crystallized by heat, dirt, etc. and its characteristics are easily deteriorated, and that it requires careful handling such as manufacturing cost, impact resistance and toxicity. Further, the photoreceptor using cadmium sulfide has poor moisture resistance and durability, and has problems such as toxicity. Zinc oxide also has the drawback of being inferior in moisture resistance and durability.

In contrast to electrophotographic photoconductors using these inorganic photoconductive materials, photoconductors using organic photoconductive materials are actively used because of their ease of film formation, manufacturing cost, and wide variation in organic compounds. Research and development is being conducted. The electrophotographic photoreceptor using the organic photoconductive material includes a function-separated photoreceptor in which a charge generation layer and a charge transport layer are laminated, and a single-layer photoreceptor in which the charge generation material is dispersed in a resin binder. Among them, the laminated type photoconductor is the mainstream because of its high sensitivity.

For example, a photoconductor in which chlordian blue and a hydrazone compound are described in JP-B-55-42380, and as a charge generating substance, JP-A-53.
Further, those described in JP-A-133445, JP-A-54-21728, JP-A-54-22834 and the like are further disclosed as JP-A-58-1980 as a charge transport material.
Those disclosed in Japanese Patent Application Laid-Open No. 43-43, Japanese Patent Application Laid-Open No. 58-199352, etc. are known, and most of the photoconductors that have been put to practical use are this laminated type photoconductor. However, in the case of a laminated type photoreceptor, the charge generation layer is generally 0.1
It is necessary to reduce the film thickness to ~ 1.0 μm, and it is easy to be affected by the condition of the surface of the conductive substrate and the atmosphere / environment during coating,
It has a great influence on yield and manufacturing cost.

Further, the charge transporting material contained in the charge transporting layer is required to have a high charge mobility for high sensitivity, but most of the charge transporting materials having a high charge mobility have a hole transporting property. Therefore, the photoconductors that have been put to practical use are limited to the negative charging type. Most of the negative charging type photoconductors use negative corona discharge during use, so that a large amount of acid gas such as ozone is generated.
Not only is it harmful to the human body, but it also shortens the life of the photoconductor itself by reacting with it. In order to prevent this, special systems such as a charging system that does not easily generate acid gas such as ozone, a system that decomposes generated gas, a system that exhausts gas generated in the device, etc. have been proposed and put into practical use, There are drawbacks such as complicated processes and systems.

On the other hand, the single-layer type photoconductor is generally known as a positive charging type photoconductor, for example, Japanese Patent Publication No. 50-1.
Polyvinylcarbazole described in JP-A-0496 and 2,
A photoreceptor containing 4,7-trinitro-9-fluorenone, a photoreceptor obtained by sensitizing polyvinylcarbazole described in JP-B-48-25658 with a pyrylium salt dye, or a photoreceptor containing a eutectic complex as a main component. JP-A-47-3
No. 0330, a photoreceptor comprising a charge generating substance and a charge transporting substance, JP-A-63-271461 and JP-A-1-11.
There are proposed a photoconductor comprising a perylene pigment described in 8143 and a charge transporting substance, and a photoconductor comprising a phthalocyanine compound and a binder resin described in JP-A-3-65961. However, these single-layer type photoreceptors are insufficient in terms of sensitivity and charge stability during repeated use, and are inferior to the laminated-type photoreceptors.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a single-layer type electrophotographic photoreceptor which is inexpensive, has particularly high sensitivity, and is excellent in stability during repeated use.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies in order to achieve the above objects, and as a result, formed by combining a phthalocyanine pigment having a specific particle size distribution with a specific organic acceptor compound. The inventors have found that the single-layer type photoconductor is suitable for the above purpose, and completed the present invention.

That is, according to the present invention, in an electrophotographic photoreceptor having a photosensitive layer formed on a conductive support, the photosensitive layer has a particle size distribution of 0.1 μm as a charge generating substance.
As described above, at least one of phthalocyanine compounds having a distribution of less than 0.5 μm occupying 60 vol% or more of the whole, an organic acceptor compound represented by the following general formula (I) or general formula (IV), and Provided is an electrophotographic photoreceptor comprising a single layer containing a binder resin,

Embedded image (In the formula, R ¹ , R ² , R ³ , and R ⁴ represent a group selected from the group consisting of a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a cyano group, and a nitro group, and are the same or different from each other. X may represent a group selected from the group consisting of the groups represented by the following general formulas (II) and (III): = 0, C (A) (B) (II) = N —R ⁹ (III) In the general formula (II), A and B each represent a hydrogen atom, a halogen atom, a cyano group, a substituted or unsubstituted aromatic group, and a group selected from the group consisting of —COOR ¹⁰ . They may be the same or different from each other, provided that R ¹⁰ represents an alkyl group, and in the general formula (III), R ⁹ is selected from the group consisting of a substituted or unsubstituted alkyl group and a substituted or unsubstituted aromatic group. Represents a radical

Embedded image (In the formula, R ⁵ , R ⁶ , R ⁷ , and R ⁸ represent an alkyl group or an aryl group, and may be the same or different from each other.) Further, the phthalocyanine compound is an X-type metal-free phthalocyanine. The above electrophotographic photoreceptor is provided, and the phthalocyanine compound is contained in an amount of 1 to 50 parts by weight based on 100 parts by weight of a binder resin. Is provided,
The average particle size D _ave of the phthalocyanine compound is
The electrophotographic photosensitive member, wherein the organic acceptor compound is 0.2 μm or more and less than 0.4,
An electrophotographic photoreceptor as described above, which is a compound represented by the following general formula (V):

Embedded image The electrophotographic photoreceptor as described above, wherein the organic acceptor compound is a compound represented by the following general formula (VI):

Embedded image There is provided the electrophotographic photoreceptor, wherein the organic acceptor compound is contained in an amount of 10 to 100 parts by weight with respect to 100 parts by weight of a binder resin.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the electrophotographic photosensitive member of the present invention, a phthalocyanine pigment as a charge generating substance having a particle size distribution of 0.1 μm or more and less than 0.5 μm in a single photosensitive layer. Is dispersed so as to be 60 vol% or more of the whole, and by combining this with a specific organic acceptor compound, a synergistic effect which is not seen when used alone is exhibited. As a result of various studies on the particle size of the phthalocyanine pigment, those having a particle size distribution centered on a particle size of 0.1 μm or more and less than 0.5 μm are excellent in terms of sensitivity. A remarkable effect is observed when 60 volwt% or more of the whole is included in the above range. Those having a distribution center in the range of 0.5 μm to 1.0 μm or more tend to have a higher residual potential when used in an electrophotographic photoreceptor and tend to have a slower sensitivity. Seen.
In addition, if the number of pigment particles with a particle size of less than 0.1 μm increases,
There is a problem with the storage stability of the dispersion. That is, the particle size is 0.1
When it becomes μm, the particles are very likely to coagulate with each other and re-coagulate, resulting in poor dispersion. From these points as well, it can be said that the particle size in the range of 0.1 μm or more and 0.5 μm is the most preferable value. In addition, when the dispersion is advanced to less than 0.1 μm, too much energy is often applied at the time of dispersion, so that the crystal structure of phthalocyanine is altered and sensitivity is lowered.

Further, in the present invention, the use of the organic acceptor compound represented by the general formula (I) or the general formula (IV) suppresses the deterioration of the charging property after repeated use, and further the distribution of By combining with a phthalocyanine pigment having a particle size, it becomes possible to obtain a highly sensitive photoreceptor having a small residual potential. The reason for this has not been clarified at this time, but it is considered that the mixing of this combination produces a sensitizing effect and causes no side effect.

In the organic acceptor compound represented by the general formula (I) or the general formula (IV) used in the present invention, in the formula, R ₁ , R ₂ , R ₃ , R ₄ , R ₅ and R ₆ , R ₇ ,
The alkyl group of R ₈ , R ₉ and R ₁₀ is preferably an alkyl group having 1 to 6 carbon atoms, and examples thereof include a methyl group, an ethyl group, a propyl group and a butyl group. In addition, R ₅ , R ₆ ,
Examples of the aryl group of R ₇ and R ₈ include a phenyl group and the like, and examples of R ₉ and the aromatic group include a phenyl group and the like. Examples of the substituent for substituting the alkyl group, aryl group, and aromatic group for R _{1 to} R ₁₀ include a halogen atom, an alkyl group, and an alkoxy group. Specific examples of these organic acceptor compounds are shown in Tables 1 and 2 below.

[0013]

[Table 1- (1)]

[0014]

[Table 1- (2)]

[0015]

[Table 1- (3)]

[0016]

[Table 1- (4)]

[0017]

[Table 2]

Examples of the phthalocyanine compound that can be used in the present invention include metal-free phthalocyanine or metal phthalocyanine, and a mixture thereof. Examples of metal phthalocyanines include copper, silver, beryllium,
Examples thereof include those having central metals such as magnesium, calcium, zinc, indium, sodium, lithium, titanium, tin, lead, vanadium, chromium, manganese, iron and cobalt. Further, in the central nucleus of phthalocyanine, a metal halide having a valence of 3 or more may be present in place of the metal atom. Although various crystal forms of phthalocyanine are known, α-type, β-type, γ-type, and ε-type are known.
Known types such as crystal type, crystal type such as τ type and X type, and amorphous type can be used. As described above, known materials can be used in the present invention. In particular, metal-free phthalocyanine having an X-type crystal structure is preferably used from the viewpoint of photosensitivity and versatility.

The method for dispersing the phthalocyanine pigment includes a ball mill, a vibration mill, a disk vibration mill, an attritor, a sand mill, a paint shaker, a jet mill,
Ultrasonic dispersion method, such as compression, shearing, grinding, rubbing,
Any pulverizing means that gives mechanical energy such as stretching, impact, vibration, etc. can be used, but it is preferable to apply the mechanical energy at the same time in the presence of a dispersion solvent to be described later for dispersion.

As the binder resin used in the present invention, known binder resins are used, but a high molecular polymer having an insulating property and a high film forming ability is preferable. For example, polystyrene, styrene-acrylonitrile copolymer, styrene-
Butadiene copolymer, styrene-maleic anhydride copolymer, polyester, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polyvinylidene chloride, polyarylate resin, polycarbonate (bisphenol A type, bisphenol Z type) ), Cellulose acetate resin, ethyl cellulose resin, polyvinyl butyral, polyvinyl formal, polyvinyl toluene, poly-N-vinylcarbazole, acrylic resin, silicone resin, epoxy resin, melamine resin, urethane resin,
Examples thereof include, but are not limited to, thermoplastic or thermosetting resins such as phenol resin and alkyd resin.

As the conductive support used in the electrophotographic photoreceptor of the present invention, a metal or alloy such as aluminum, brass, stainless steel, nickel, etc., an insulating support such as polyethylene terephthalate, polypropylene, nylon, glass, paper, etc. A thin film of a metal such as aluminum, silver, gold or nickel, or a conductive material such as indium oxide or tin oxide, or conductive powder such as carbon black, indium oxide or tin oxide is dispersed in an appropriate resin. Examples thereof include a film-formed product and a conductive paper. The shape of the conductive support is not particularly limited, and a plate-shaped, drum-shaped, or belt-shaped material is used as necessary.

1 to 4 are schematic sectional views showing the specific constitution of the electrophotographic photosensitive member of the present invention. In the present invention, FIGS.
As shown in FIG. 3, any form may be used as long as the photosensitive layer is a single layer type, and an undercoat layer 3 may be provided between the photosensitive layer 2 and the support 1 in order to improve adhesiveness and charge blocking property. Further, a protective layer 4 may be provided on the photosensitive layer 2 in order to improve mechanical durability such as abrasion resistance.

As a method for producing the electrophotographic photoreceptor of the present invention, a coating solution for a photosensitive layer is applied and dried on a conductive support by a dip coating method, a spray coating method, a bead coating method or the like. good. Examples of the solvent for the dispersion treatment of the phthalocyanine compound and the organic acceptor compound include ketones, esters, alcohols, cyclic ethers, cyclic ketones, etc., preferably cyclic ethers, cyclic ketones, and more preferably the expression of a sensitizing effect. From the viewpoint of properties, tetrahydrofuran and cyclohexanone can be exemplified.

The ratio of the charge generating substance to the binder resin used in the present invention is preferably in the range of 1 to 50 parts by weight with respect to 100 parts by weight of the binder resin. If it is less than the above range, the residual potential is large, and if it is more than the above range, the charging property and the mechanical strength are lowered.

The ratio of the organic acceptor compound and the binder resin used in the present invention is preferably in the range of 10 to 100 parts by weight based on 100 parts by weight of the binder resin of the organic acceptor compound. If it is less than the above range, the sensitivity and the charging potential at the time of repeated use are lowered, and if it is more than the above range, the charging property and the mechanical strength are deteriorated.

The thickness of the photosensitive layer of the present invention is 5 to 100 μm,
The range of 10 to 50 μm is preferable. If it is thinner than 5 μm, it has no mechanical durability, and if it is thicker than 100 μm, the residual potential increases.

[0027]

EXAMPLES Next, the present invention will be described in more detail by way of examples.

Example 1 X-type metal-free phthalocyanine pigment [Fastgen Blue 8120B (manufactured by Dainippon Ink and Chemicals, Inc.)] 2 as a charge generating substance
5 parts by weight of a Z-type polycarbonate resin having a molecular weight of 40,000 and 0.1 part by weight of silicone oil [KF-50 (manufactured by Shin-Etsu Chemical Co., Ltd.)] were dissolved in 360 parts by weight of tetrahydrofuran to prepare a resin solution, which was ball milled. Dispersed for 20 hours. The exemplified compound No. 40 parts by weight of the organic acceptor compound A-2, 50 parts by weight of Z-type polycarbonate resin, and 340 parts by weight of tetrahydrofuran were added, and further dispersed by a ball mill for 24 hours to prepare a coating liquid for photosensitive layer.
A part of this coating liquid was extracted, and the particle size of the phthalocyanine pigment was measured by a centrifugal automatic particle size distribution measuring device,
72.5 if the particle size is 0.1 μm or more and less than 0.5 μm
vol%. The average particle diameter D _ave is 0.27 μm
Met. The photosensitive layer coating liquid thus obtained,
An aluminum plate having a thickness of 0.2 mm [A1080 (Sumitomo Light Metal Co., Ltd.)] was coated with a blade and dried at 130 ° C. for 20 minutes to form a photosensitive layer having a thickness of 20 μm, and an electrophotographic photosensitive member of Example 1 was prepared. .

Examples 2 to 4 In Example 1, by changing the dispersion time of the X-type metal-free phthalocyanine and the solid content concentration of the resin solution, those having a particle size of 0.1 μm or more and less than 0.5 μm were prepared. 3% by volume (Example 2), 65.4% by volume (Example 3), and 76.1% by volume (Example 4) were prepared in the same manner as in Example 1 except for the above.

Example 5 Electrons of Example 5 were carried out in the same manner as in Example 1 except that τ type metal-free phthalocyanine (Riophoton THP (manufactured by Toyo Ink Co.)) was used in place of X-type metal-free phthalocyanine in Example 1. A photographic photoreceptor was created.

Example 6 An electrophotographic photosensitive member of Example 6 was prepared in the same manner as in Example 1 except that the amount of the X-type metal-free phthalocyanine added was changed to 0.08 part by weight.

Example 7 An electrophotographic photosensitive member of Example 7 was prepared in the same manner as in Example 1 except that the amount of the X-type metal-free phthalocyanine added was 1 part by weight.

Example 8 Example 8 was performed in the same manner as in Example 1 except that the amount of the X-type metal-free phthalocyanine added was changed to 50 parts by weight.
Was prepared.

Example 9 Example 9 was carried out in the same manner as in Example 1 except that the amount of the X-type metal-free phthalocyanine added was 52 parts by weight.
Was prepared.

Example 10 In Example 1, the dispersion time of the ball mill of X-type metal-free phthalocyanine was changed and the average particle diameter D _ave was 0.15 μm.
An electrophotographic photosensitive member of Example 10 was prepared in the same manner as in Example 1 except that m was set.

Example 11 The average particle diameter D _ave was 0.21 μm by changing the dispersion time of the ball mill of X-type metal-free phthalocyanine in Example 1.
An electrophotographic photosensitive member of Example 11 was prepared in the same manner as in Example 1 except that m was set.

Example 12 In Example 1, the average particle diameter D _ave was 0.39 μm by changing the dispersion time of the ball mill of X-type metal-free phthalocyanine.
An electrophotographic photosensitive member of Example 12 was prepared in the same manner as in Example 1 except that m was set.

Example 13 In Example 1, the average particle diameter D _ave was 0.49 μm by changing the dispersion time of the ball mill of X-type metal-free phthalocyanine.
An electrophotographic photosensitive member of Example 13 was prepared in the same manner as in Example 1 except that m was set.

Example 14 Example 1 was repeated in the same manner as in Example 1 except that the organic acceptor compound was Exemplified Compound A-29.
The electrophotographic photosensitive member of No. 4 was prepared.

Example 15 Example 15 was carried out in the same manner as in Example 1 except that the organic acceptor compound was changed to Exemplified Compound B-3.
Was prepared.

Example 16 Example 16 was carried out in the same manner as in Example 1 except that the organic acceptor compound was Exemplified Compound B-5.
Was prepared.

Example 17 An electrophotography of Example 17 was carried out in the same manner as in Example 1 except that 20 parts by weight of Exemplified Compound A-2 and 20 parts by weight of Exemplified Compound B-5 were used as the organic acceptor compound in Example 1. A photoconductor was created.

Example 18 Example 18 was performed in the same manner as in Example 1 except that the amount of the organic acceptor compound added was 8 parts by weight.
Was prepared.

Example 19 Example 1 was repeated in the same manner as Example 1 except that the amount of the organic acceptor compound added was 10 parts by weight.
No. 9 electrophotographic photosensitive member was prepared.

Example 20 An electrophotographic photosensitive member of Example 20 was prepared in the same manner as in Example 1 except that the amount of the organic acceptor compound added was 100 parts by weight.

Example 21 An electrophotographic photoreceptor of Example 21 was prepared in the same manner as in Example 1 except that the amount of the organic acceptor compound added was 110 parts by weight.

Comparative Example 1 In Example 1, the dispersion time of the X-type metal-free phthalocyanine and the solid content concentration of the resin solution were varied to obtain particles having a particle size of 0.1 μm or more and less than 0.5 μm of 57.6.
An electrophotographic photosensitive member of Comparative Example 1 was prepared in the same manner as in Example 1 except that the percentage was changed.

Comparative Example 2 In Example 1, by changing the dispersion time of the X-type metal-free phthalocyanine and the solid content concentration of the resin solution, those having a particle size of 0.1 μm or more and less than 0.5 μm were 46.5.
An electrophotographic photosensitive member of Comparative Example 1 was prepared in the same manner as in Example 1 except that the percentage was changed.

Comparative Example 3 An electrophotographic photosensitive member of Comparative Example 2 was prepared in the same manner as in Example 1 except that the organic acceptor compound in Example 1 was changed to Comparative Compound 1 below.

Embedded image

Comparative Example 4 An electrophotographic photosensitive member of Comparative Example 3 was prepared in the same manner as in Example 1 except that the organic acceptor compound was not added.

Comparative Example 5 Comparative Example 4 was carried out in the same manner as in Example 1 except that the charge generating substance in Example 1 was changed to Comparative Compound 2 shown below.
Was prepared.

[Chemical 6]

Examples 1 and 2 obtained as described above
1. The electrostatic characteristics of the electrophotographic photosensitive members of Comparative Examples 1 to 4 are set to 25 ° C.
It was measured by a dynamic method using EPA-8100 (manufactured by Kawaguchi Denki Seisakusho) under the environment of / 55% RH. First, after charging with an applied voltage of +6 KV for 10 seconds, dark decay was performed for 20 seconds, and exposure was performed with a monochromatic light source of 780 nm having a surface illuminance of 10 μW / cm ² . The charging potential is the saturated surface potential Vm (V) 10 seconds after the start of charging, and the sensitivity is the exposure amount E1 / 2 (μJ / cm) required for the surface potential after exposure to be half the surface potential immediately before exposure. ² [Monochromatic light])
Was measured. Further, the above-mentioned charging to exposure are repeated 5,000 times to stabilize the electrostatic characteristics (after fatigue: Vm ′, E1 /
2 ') was evaluated. Table 3 shows the results.

[0053]

[Table 3- (1)]

[0054]

[Table 2- (2)]

[0055]

The electrophotographic photoreceptor of the present invention comprises a photosensitive layer,
As the charge generating substance, the particle size distribution is 0.1 μm or more,
A phthalocyanine compound having a distribution of less than 5 μm in an amount of 60 vol% or more of the whole, the general formula (I) or (I
By having a single-layer structure composed of an organic acceptor compound represented by V) and a binder resin, it has high sensitivity and extremely excellent stability of electrostatic characteristics even after repeated use.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an electrophotographic photosensitive member of the present invention.

FIG. 2 is a schematic sectional view of another constitution of the electrophotographic photosensitive member of the present invention.

FIG. 3 is a schematic cross-sectional view of another configuration of the electrophotographic photosensitive member of the present invention.

FIG. 4 is a schematic cross-sectional view of still another configuration of the electrophotographic photosensitive member of the present invention.

[Explanation of symbols]

 1 Conductive Support 2 Photosensitive Layer 3 Undercoat Layer 4 Protective Layer

Claims (7)

[Claims] 1. An electrophotographic photoreceptor having a photosensitive layer formed on a conductive support, wherein the photosensitive layer has a particle size distribution of 0.1 μm or more and less than 0.5 μm as a charge generating substance. At least one of a phthalocyanine compound occupying 60% by volume or more of the whole and an organic acceptor compound represented by the following general formula (I) or general formula (IV)
An electrophotographic photoreceptor comprising a single layer containing a seed and a binder resin. Embedded image (In the formula, R ¹ , R ² , R ³ , and R ⁴ represent a group selected from the group consisting of a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a cyano group, and a nitro group, and are the same or different from each other. X may represent a group selected from the group consisting of the groups represented by the following general formulas (II) and (III): = 0, C (A) (B) (II) = N —R ⁹ (III) In the general formula (II), A and B each represent a hydrogen atom, a halogen atom, a cyano group, a substituted or unsubstituted aromatic group, or a group selected from the group consisting of —COOR ^10. R ¹⁰ represents an alkyl group, and in the above general formula (III), R ⁹ represents a group consisting of a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aromatic group. Represents a group selected from (In the formula, R ⁵ , R ⁶ , R ⁷ , and R ⁸ represent an alkyl group or an aryl group, and may be the same or different from each other.) 2. The electrophotographic photosensitive member according to claim 1, wherein the phthalocyanine compound is an X-type metal-free phthalocyanine. 3. The binder resin 1 wherein the phthalocyanine compound is
The electrophotographic photosensitive member according to claim 1, wherein the content is 1 to 50 parts by weight with respect to 00 parts by weight. 4. The average particle diameter D of the phthalocyanine compound
_{2. The} electrophotographic photosensitive member according to claim 1, wherein _ave is 0.2 μm or more and less than 0.4 μm. 5. The electrophotographic photosensitive member according to claim 1, wherein the organic acceptor compound is a compound represented by the following general formula (V). Embedded image 6. The electrophotographic photosensitive member according to claim 1, wherein the organic acceptor compound is a compound represented by the following general formula (VI). Embedded image 7. An electrophotographic photosensitive member, wherein the organic acceptor compound is contained in a proportion of 10 to 100 parts by weight with respect to 100 parts by weight of a binder resin.