JP3136378B2 - Electrophotographic photoreceptor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic photoreceptor,
In particular, the present invention relates to an electrophotographic photosensitive member having an organic photoconductive photosensitive layer.

[0002]

BACKGROUND OF THE INVENTION In the electrophotographic copying machine of the Carlson method, an electrostatic latent image is formed by charging a photoreceptor surface, exposing it to light, developing the electrostatic latent image with toner, and then developing the latent image. The image is transferred and fixed on paper or the like. At the same time, the photoreceptor is subjected to removal of adhered toner, static elimination, and surface cleaning, and is repeatedly used for a long time.

Accordingly, the electrophotographic photoreceptor has not only electrophotographic characteristics such as good charging characteristics and sensitivity and low dark decay, but also printing durability, abrasion resistance and moisture resistance in repeated use. It is also required to have good physical properties such as properties, resistance to ozone generated during corona discharge, and resistance to ultraviolet rays during exposure (environmental resistance).

Conventional electrophotographic photoreceptors include selenium,
Inorganic photoreceptors having a photosensitive layer mainly containing an inorganic photoconductive substance such as zinc oxide and cadmium sulfide are widely used. On the other hand, utilization of various organic photoconductive substances as materials for a photosensitive layer of an electrophotographic photosensitive member has been actively developed and studied in recent years.

The same is naturally required for an organic photoconductive photoreceptor, and JP-A-63-71856 and JP-A-63-71857 have attempted to improve the performance by adding a specific compound. I have.

However, the potential stability at the time of repetitive copying and the durability of the photoreceptor are still insufficient and need to be further improved, as disclosed in JP-A-63-71855, JP-A-63-71857 and JP-A-63-52150. , 63-5
No. 0848-50851 proposes an additive for improving the durability. These focus on preventing deterioration of the performance of the photoreceptor due to ozone generated during charging.However, the durability and durability of the photoreceptor are not only impaired by ozone oxidation, but also electrons and holes in the photoreceptor layer. NO NO
_It is also caused by _X and SO _X , and in addition to ozone oxidation, repetitive use causes a decrease in charging ability and an increase in residual potential.

[0007] Means or additives for maintaining and repairing the performance of these are collectively required.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electrophotographic photoreceptor having an organic photoconductive photoreceptor having good sensitivity, durability and durability, in view of the above circumstances.

[0009]

The object of the present invention is to provide an electrophotographic photosensitive member having a photosensitive layer comprising a charge generating substance (CGM) on a conductive support.
This is achieved by any of the electrophotographic photoreceptors characterized by containing at least one of the compounds represented by any of (6).

[0010]

Embedded image

R ₁ is a hydrogen atom , an alkoxy group, an aryl
Group , an aryloxy group, a heterocyclic group, and a substituent thereof.

R ₂ , R ₃ , R ₈ , R ₉ , R _{11 to} R ₁₈ , R
_{20 to} R ₂₇ , R _{29 to} R ₃₆ , R _{38 to} R ₄₅ , and R _{47 to} R _{58 each} represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, an aryl group, or a substituent thereof. . R _{4 to} R ₇ represent a hydrogen atom.

The substituent of the substituent is selected from a halogen atom, an alkyl group, an alkoxy group, an aryl group, an aryloxy group, a thioether group, an acyl group and a sulfonamide group.

R ₁₀ , R ₁₉ , R ₂₈ , R ₃₇ and R _{46 each} represent a hydrogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, an alkenyl group, an aryl group, an aryloxy group, a heterocyclic group or a substituent thereof. Represents one of the following.

The substituent of the substituent is selected from a halogen atom, an alkyl group, an alkoxy group, an aryl group, an aryloxy group, a thioether group, an acyl group and a sulfonamide group.

The compounds represented by the general formulas (1) to (6) can be easily synthesized by a known synthesis method.

Next, specific compounds will be exemplified.

[0018]

Embedded image

[0019]

Embedded image

[0020]

Embedded image

[0021]

Embedded image

The compound according to the present invention is used in an amount of 0.01 to 30% by weight of the total composition of the photosensitive layer composition, a carrier generation layer (CGL),
When a carrier transport layer (CTL) is separately provided, it is preferable that the carrier transport layer (CTL) is contained in an amount of 0.01 to 30% by weight of the total amount of each layer.

The carrier generating substance (CGM) and carrier transporting substance (CTL) used in the present invention include:
JP-A-63-71857, JP-A-2-13124, Japanese Patent Application No. 2-146662
And the like.

For example, organic pigments as shown in the following representative examples are used as CGM.

(1) Azo pigments such as monoazo pigments, bisazo pigments, triazo pigments, metal complex salt azo pigments and the like (2) Perylene pigments such as perylene anhydride and perylene imide (3) Anthraquinone derivatives, anthantrone derivatives, dibenz Polycyclic quinone pigments such as pyrenequinone derivatives, pyranthrone derivatives, biolanthrone derivatives, and isoviolanthrone derivatives (4) Indigoid pigments such as indigo derivatives and thioindigo derivatives (5) Phthalocyanine pigments such as metal phthalocyanine and metal-free phthalocyanine In a photographic photoreceptor, it is preferable to use an organic pigment such as a fluorenone-based disazo pigment, a fluorenylidene-based disazo pigment, a polycyclic quinone pigment, a metal-free phthalocyanine pigment, or an oxytitanyl-based phthalocyanine pigment as the CGM. In particular, when a fluorenone-based disazo pigment, a fluorenylidene-based disazo pigment, a polycyclic quinone pigment, an X- or τ-type metal-free phthalocyanine and an oxytitanyl-based phthalocyanine pigment described in JP-A-64-17066 are used in the present invention, sensitivity and durability are improved. And a significantly improved effect in terms of image quality and the like.

The CTM that can be used in the present invention is not particularly limited. For example, oxazole derivatives,
Oxadiazole derivative, thiazole derivative, thiadiazole derivative, triazole derivative, imidazole derivative, imidazolone derivative, imidazolidine derivative, bisimidazolidine derivative, styryl compound, hydrazone compound, pyrazoline derivative, amine derivative, oxazolone derivative, benzothiazole derivative, benzimidazole Derivatives, quinazoline derivatives, benzofuran derivatives, acridine derivatives, phenazine derivatives, aminostilbene derivatives, poly-N-vinylcarbazole, poly-1-vinylpyrene, poly-9-vinylanthracene, and the like.

As the CTM used in the present invention, a CTM which is excellent in the ability to transport holes generated upon light irradiation to the support side and which is suitable for combination with the organic pigment used in the present invention is preferable.

Examples of the binder used in the present invention include the following. (1) Polyester (2) Methacrylic resin (3) Acrylic resin (4) Polyvinyl chloride (5) Polyvinylidene chloride (6) Polystyrene (7) Polyvinyl acetate (8) Styrene copolymer resin (for example, styrene-butadiene copolymer (9) Acrylonitrile copolymer resin (for example, vinylidene chloride-acrylonitrile copolymer, etc.) (10) Vinyl chloride-vinyl acetate copolymer (11 ) Vinyl chloride-vinyl acetate-maleic anhydride copolymer (12) Silicone resin (13) Silicone-alkyd resin (14) Phenol resin (for example, phenol-formaldehyde resin, cresol formaldehyde resin,
(15) Styrene-alkyd resin (16) Poly-N-vinyl carbazole (17) Polyvinyl butyral (18) Polyvinyl formal (19) Polyhydroxystyrene (20) Polycarbonate resin These binders may be used alone or in combination. These can be used in combination as a mixture.

The dispersion medium of the organic pigment used in the present invention includes, for example, hydrocarbons such as hexane, benzene, toluene, xylene, methylene chloride, methylene bromide, 1,2-dichloroethane, syn-tetrachloroethane, cis -1,2-dichloroethylene, 1,1,2-trichloroethane, 1,1,1-trichloroethane, 1,2-dichloropropane,
Halogenated hydrocarbons such as chloroform, bromoform and chlorobenzene, ketones such as acetone, methyl ethyl ketone and cyclohexanone, esters such as ethyl acetate and butyl acetate, methanol, ethanol, propanol, butanol, cyclohexanol and heptanol,
Alcohols such as ethylene glycol, methyl cellosolve, ethyl cellosolve, cellosolve acetate and derivatives thereof,
Ethers such as tetrahydrofuran, 1,4-dioxane, furan, and furfural; acetals; amines such as pyridine, butylamine, diethylamine, ethylenediamine, and isopropanolamine; nitrogen compounds such as amides such as N, N-dimethylformamide; and other fatty acids And phenols, sulfur such as carbon disulfide and triethyl phosphate, and phosphorus compounds.

In the present invention, the photosensitive layer may contain one or more electron-accepting substances for the purpose of improving sensitivity, reducing residual potential and reducing fatigue during repeated use.

Examples of the electron accepting substance that can be used here include succinic anhydride, maleic anhydride, dibromomaleic anhydride, phthalic anhydride, tetrachlorophthalic anhydride, tetrabromophthalic anhydride, and 3-nitrophthalic anhydride. Acid, 4-nitrophthalic anhydride, pyromellitic anhydride,
Melitic anhydride, tetracyanoethylene, tetracyanoquinodimethane, o-dinitrobenzene, m-dinitrobenzene, 1,3,5-trinitrobenzene, paranitrobenzonitrile, picryl chloride, quinone chlorimide, chloranil, bulmanil, Dichlordicyanoparabenzoquinone, anthraquinone, dinitroanthraquinone, 2,7-dinitrofluorenone, 2,4,7-trinitrofluorenone,
2,4,5,7-tetranitrofluorenone, 9-fluorenylidene [dicyanomethylenemalonodinitrile], polynitro-9
-Fluorenylidene- [dicyanomethylenemalonodinitrile], picric acid, o-nitrobenzoic acid, p-nitrobenzoic acid, 3,5-dinitrobenzoic acid, pentafluorobenzoic acid,
Examples thereof include 5-nitrosalicylic acid, 3,5-dinitrosalicylic acid, phthalic acid, melitic acid, and other compounds having a high electron affinity. The addition ratio of the electron-accepting substance is 100: 0.01 to 200, preferably 100: 0.1 to 100, in terms of weight ratio, of the organic pigment used in the present invention: the electron-accepting substance.

The proportion of the electron accepting substance added to such a layer is 100: 0.01 to 100, preferably 100: 0.1 to 50, by weight, as a whole: CTM: electron accepting substance.

Further, organic amines can be added to the photosensitive layer of the present invention for the purpose of improving the charge generation function of CGM, and it is particularly preferable to add a secondary amine. These compounds are described in JP-A-59-218447 and JP-A-62-8160.

In the photosensitive layer of the present invention, an antioxidant can be added for the purpose of preventing ozone deterioration. Representative specific examples of such antioxidants are shown below, but are not limited thereto.

Group I-; hindered phenols; Group II-;
Paraphenylenediamines, group III-; hydroquinones, group IV-; organic sulfur compounds, group V-; organic phosphorus compounds.

These compounds are disclosed, for example, in JP-A-63-18354.

These compounds are known as antioxidants for rubber, plastics, oils and the like, and commercially available products can be easily obtained.

The addition amount of the antioxidant is 0.1 to 100 parts by weight, preferably 1 to 50 parts by weight, particularly preferably 5 to 25 parts by weight based on 100 parts by weight of CTM.

The photoreceptor of the present invention may further contain, if necessary, an ultraviolet absorber or the like for the purpose of protecting the photosensitive layer, or may contain a dye for correcting color sensitivity. In the protective layer according to the present invention, workability and physical properties are improved (prevention of cracks,
Thermoplastic resin if necessary for the purpose of imparting flexibility)
Less than 50 wt% can be contained.

The intermediate layer functions as an adhesive layer or a blocking layer. In addition to the binder resin, for example, polyvinyl alcohol, ethyl cellulose, carboxymethyl cellulose, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate -Maleic anhydride copolymer,
Casein, N-alkoxymethylated nylon, starch and the like are used.

As the conductive support used in the constitution of the electrophotographic photosensitive member of the present invention, the following are mainly used, but the present invention is not limited thereto.

1) A metal plate such as an aluminum plate and a stainless plate.

2) A thin metal layer of aluminum, palladium, gold or the like provided on a support such as paper or plastic film by lamination or vapor deposition.

3) A substrate in which a layer of a conductive compound such as a conductive polymer, indium oxide, or tin oxide is provided on a support such as paper or a plastic film by coating or vapor deposition. In the present invention, the composition, material, film thickness, etc. of the support, CGL, CTL, the intermediate layer and the overcoat layer are described in JP-A-63-71857, JP-A-63-155047-155051, and JP-A-Heisei 1-3.
No. 02264, No. 1-319043, No. 2-131243, No. 3-11358,
The construction conditions described in Japanese Patent Application No. 3-96958, Japanese Patent Application No. 2-45298, Japanese Patent Application No. 2-146463 and the like can be imitated.

As shown in FIGS. 1A and 1B, the photoreceptor of the present invention comprises a conductive support 1 on which CGL2 containing CGM as a main component and CTL3 containing CTM as a main component.
Is provided. As shown in FIGS. 1 (3) and 4 (4), the photosensitive layer 4 may be provided via an intermediate layer 5 provided on the conductive support 1. Thus, when the photosensitive layer 4 has a two-layer structure, an electrophotographic photosensitive member having the best electrophotographic characteristics can be obtained. In the present invention, as shown in FIGS.
A photosensitive layer 4 in which fine particles of CGM 7 are dispersed in a binder resin in a layer 6 containing CTM as a main component may be provided directly on the conductive support 1 or via an intermediate layer 5.

Further, in the present invention, as shown in FIGS. 1 (5) and (6), the photosensitive layer may be such that CGM7 is dispersed in a binder resin without adding CTM.

Further, CTM may be added to CGL.
However, the addition amount range is 300 parts by weight or less, preferably 200 parts by weight or less for 100 parts by weight of CGM.

Further, a protective layer 8 may be provided on the photosensitive layer 4 if necessary.

Here, when the photosensitive layer 4 has a two-layer structure, C
Which of GL2 and CTL3 is to be the upper layer is determined by selecting either positive or negative charging polarity. That is, in the case of forming a negatively charged photosensitive layer, it is advantageous to use CTL3 as the upper layer, because CTM in the CTL3 is a substance having a high transporting ability for holes.

The CGL constituting the two-layered photosensitive layer 4
2 can be formed directly on the conductive support 1 or the CTL 3 or, if necessary, after providing an intermediate layer such as an adhesive layer or a blocking layer, by the following method.

(1) Vacuum evaporation method (2) Method of applying a solution in which CGM is dissolved in an appropriate solvent (3) CGM is made into fine particles in a dispersion medium by a ball mill, a sand grinder or the like, and a binder is used if necessary. And applying a dispersion obtained by mixing and dispersing.

That is, specifically, a vapor deposition method such as vacuum deposition, sputtering, or CVD, or dipping, spraying,
A coating method such as a blade or a roll method is optionally used.

The thickness of CGL2 thus formed is preferably 0.01 to 10 μm, more preferably 0.010 to 10 μm.
5 to 5 μm.

Although the thickness of the CTL 3 can be changed as required, it is usually preferably 5 to 30 μm. This CT
The composition ratio in L3 is preferably 0.1 to 5 parts by weight of the binder with respect to 1 part by weight of the CTM of the present invention, but when the photosensitive layer 4 in which fine-grained CGM is dispersed is formed, 1 part by weight of CGM is used. It is preferable to use the binder in a range of 5 parts by weight or less. When the CGL is of a binder-dispersed type, the binder is preferably used in an amount of 5 parts by weight or less based on 1 part by weight of CGM.

[0055]

The present invention will now be described in detail with reference to Examples.
This does not limit the embodiments of the present invention.

Example 1 3 wt parts of copolymerized nylon (CM-8000, manufactured by Toray Co., Ltd.) was placed in a 60φ aluminum tube for Konica Laser Printer LP-3015.
A solution of 90 parts by weight of methanol and 10 parts by weight of butanol was applied to form a 0.3 μm-thick undercoat layer (UCL).

Then, 4 wt% of titanyl phthalocyanine = TiOPc (Synthesis Example 1 described in JP-A-2-131243) was used as CGM.
Part, silicone resin "KR-5240" (Shin-Etsu Chemical) 20wt
Parts, 100 wt parts of methyl ethyl ketone are crushed and dispersed by a sand grinder, and the resulting dispersion is applied by dip coating (dip coating).
Then, CGL having a thickness of 0.3 μm was formed.

On the other hand, 10 wt parts of CTM, 15 wt parts of polycarbonate resin “Iupilon Z” (manufactured by Mitsubishi Gas Chemical), 0.001 wt parts of silicone oil “KF-54” (manufactured by Shin-Etsu Chemical), compound (1) -3 of the present invention 0.1 wt part was dissolved in 1,2-dichloroethane, dipped and dried at 90 ° C. for 1 hour to form a 20 μm-thick CTL to obtain a photoreceptor.

Examples 2 to 14 and Comparative Example (1) Binder used for UCL, CG used for CGL and CTL
A photoreceptor was obtained in the same manner as in Example 1, except that M, CTM and the compound were replaced as shown in Table 1. Table 1 also shows the requirements of Example 1. Also used UC
B of L; B1, B2, CGM; G1, G2, CT
M; T1 and T2 are as follows.

[0060]

Embedded image

Example 15 A photoreceptor was obtained in exactly the same manner as in Example 1 except that the CGL and CTL were switched upside down.

[0062]

[0063]

[Table 1]

Example 17 In the same manner as in Example 1, UCL was provided on a 60φ aluminum tube, 20 wt parts of X-type non-metallic phthalocyanine as a pigment, 5 wt% of compound (2) -1, and a polyester resin “Almatex” as a binder. P-645 "(Mitsui Toatsu Chemicals) 40wt
Parts (converted to dry weight) and 10 parts by weight (converted to dry weight) of melanin resin “Uban 21” (manufactured by Mitsui Toatsu Chemicals) and 450 wt. Drying was carried out at 1 ° C. for 1 hour to obtain a single-layer photosensitive layer having a thickness of 15 μm.

Example 18 A methoxy-modified nylon “Diamid X-1874M” was placed in an 80φ aluminum tube for a Konica copier U-Bix 3035.
(Daicel) 3wt part, methanol 90wt part butanol 10
A solution of wt part was applied to form a 0.3 μm thick UCL.

Then, the following compound G3 was used as CGL in an amount of 4 wt.
Part, butyral resin "ESLEK BL-1" (manufactured by Sekisui Chemical) was mixed and dispersed in a sand grinder by 2 wt. Parts and 100 wt. Parts of methyl ethyl ketone.
A 0.3 μm CGL was formed. Example 1 on the above CGL
CTL was formed in the same manner except that the compound of the CTL solution was changed to the compound of Table 2.

Examples 19 to 23 and Comparative Example (2) Similarly, the binder, CGL, and CTL used for UCL
A photoconductor was obtained in the same manner as that of Example 18 except that CGM, CTM and compounds used in Table 2 were changed as shown in Table 2.

[0068]

Embedded image

[0069]

[Table 2]

Evaluation of characteristics: Laser printer LP3115 (manufactured by Konica) was applied to each sample of Examples 1 to 17 and Comparative Example (1).
Perform repeated copying using the modified machine, the exposed portion potential V _L, the image evaluation of the potential of the non-exposed portion potential V _H after measurement and 10000 times printing was performed. Table 3 shows the results. Examples 18 to
23 and Comparative Example (2) were repeatedly copied using a modified U-Bix 3035 (manufactured by Konica), and the potentials V _H and OD at an optical density (OD) of 1.3 and the potential V _L of 0.08 were measured and copied 10,000 times. Later image evaluation was performed and the results are shown in Table 3.

[0071]

[Table 3]

As is clear from Table 3, the sample of the present invention was 10
Even after 000 times of copying (printing), the same good potential characteristics as at the start were maintained. On the other hand, in the comparative example, _VH was lowered to cause fogging on a white background or a reduction in image density.

[0073]

The photoreceptor of the present invention has excellent electrophotographic performance, and stable image characteristics can be obtained even after repeated use.

[Brief description of the drawings]

FIGS. 1 (1) to 1 (6) are cross-sectional views each showing an example of a mechanical configuration of a photoconductor of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 conductive support 2 carrier generating layer 3 carrier transporting layer 4 photosensitive layer 5 intermediate layer 6 layer containing carrier transporting substance 7 carrier generating substance 8 protective layer

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-257457 (JP, A) JP-A-4-98263 (JP, A) JP-A-63-73256 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) G03G 5/00-5/16

Claims (6)

(57) [Claims] 1. An electrophotographic photoreceptor comprising a conductive support and a photosensitive layer comprising a charge generating substance provided thereon.
An electrophotographic photosensitive member, characterized in that it contains a small Do Kutomo one of the compounds represented by the following general formula (1). Embedded image [In the general formula (1), R ₁ represents a hydrogen atom ,
Group, an aryl group , an aryloxy group, a heterocyclic group, and a substituent thereof. R _{4 to} R ₇ each represent a hydrogen atom; R ₂ , R ₃ , R ₈ , and R ₉ represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, an aryl group, an aryloxy group, and substitution thereof. Represents a body group. Further, the substituent of the substituent group is selected from a halogen atom, an alkyl group, an alkoxy group, an aryl group, an aryloxy group, a thioether group, an acyl group, and a sulfonamide group. ] 2. An electrophotographic photoreceptor comprising a conductive support and a photosensitive layer comprising a charge generating substance provided thereon.
An electrophotographic photoreceptor comprising at least one compound represented by the following general formula (2). Embedded image [In the general formula (2), R ₁₀ represents a hydrogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, an alkenyl group,
It represents one of an aryl group, an aryloxy group, an amino group, a heterocyclic group and a substituent thereof. Also, R _{11 to} R
₁₈ represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, an aryl group, an aryloxy group, or a substituent thereof. Further, as the substituent of the substituent group, a halogen atom, an alkyl group, an alkoxy group, an aryl group, an aryloxy group, a thioether group,
It is selected from an acyl group and a sulfonamide group. ] 3. An electrophotographic photoreceptor comprising a conductive support provided with a photosensitive layer containing a charge generating substance,
An electrophotographic photoreceptor comprising at least one compound represented by the following general formula (3). Embedded image [In the general formula (3), R ₁₉ represents a hydrogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, an alkenyl group,
Represents one of an aryl group, an aryloxy group, a heterocyclic group and a substituent thereof. R _{20 to} R _{27 each} represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, an aryl group, an aryloxy group, or a substituent thereof. Further, as a substituent of the substituent group, a halogen atom, an alkyl group, an alkoxy group, an aryl group, an aryloxy group, a thioether group, an acyl group,
Selected from among sulfonamide groups. ] 4. An electrophotographic photoreceptor comprising a photosensitive layer provided on a conductive support and containing a charge generating substance,
An electrophotographic photoreceptor comprising at least one compound represented by the following general formula (4). Embedded image [In the general formula (4), R ₂₈ represents a hydrogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, an alkenyl group,
Represents one of an aryl group, an aryloxy group, a heterocyclic group and a substituent thereof. R _{29 to} R ₃₆ represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, an aryl group, an aryloxy group, or a substituent thereof. Further, as a substituent of the substituent group, a halogen atom, an alkyl group, an alkoxy group, an aryl group, an aryloxy group, a thioether group, an acyl group,
Selected from among sulfonamide groups. ] 5. An electrophotographic photoreceptor comprising a photosensitive layer provided on a conductive support and containing a charge generating substance,
An electrophotographic photoreceptor comprising at least one compound represented by the following general formula (5). Embedded image [In the general formula (5), R ₃₇ represents a hydrogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, an alkenyl group,
Represents one of an aryl group, an aryloxy group, a heterocyclic group and a substituent thereof. R _{38 to} R _{45 each} represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, an aryl group, an aryloxy group or a substituent thereof. Further, as a substituent of the substituent group, a halogen atom, an alkyl group, an alkoxy group, an aryl group, an aryloxy group, a thioether group, an acyl group,
Selected from among sulfonamide groups. ] 6. An electrophotographic photoreceptor comprising a photosensitive layer provided on a conductive support and containing a charge generating substance,
An electrophotographic photoreceptor comprising at least one compound represented by the following general formula (6). Embedded image [In the general formula (6), R ₄₆ represents a hydrogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, an alkenyl group,
Represents one of an aryl group, an aryloxy group, a thioether group, a heterocyclic group, and a substituent thereof. Also R ₄₇
To R ₅₈ represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, an aryl group, an aryloxy group and a substituent thereof. Further, the substituent of the substituent group is selected from a halogen atom, an alkyl group, an alkoxy group, an aryl group, an aryloxy group, a thioether group, an acyl group, and a sulfonamide group. ]