JP2924886B2 - 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, and more particularly to an electrophotographic photoreceptor used in an electrophotographic printer, a copying machine, and the like, which relates to an improvement in a charge transport layer used in a photosensitive layer. .

[0002]

2. Description of the Related Art Conventionally, as a photosensitive material of an electrophotographic photosensitive member (hereinafter also referred to as a photosensitive member) used for an electrophotographic printer, a facsimile, a digital copying machine, and an analog copying machine, inorganic light such as selenium or a selenium alloy is used. Conductive substance deposited in vacuum, inorganic photoconductive substance such as zinc oxide or cadmium sulfide dispersed in resin binder, organic photoconductive substance such as poly-N-vinyl carbazole or polyvinyl anthracene A material in which an organic photoconductive material such as a phthalocyanine compound or a bisazo compound is dispersed in a resin binder, or a material obtained by vacuum evaporation is used.

A photoreceptor is required to have a function of retaining a surface charge in a dark place, a function of receiving light to generate a charge, and a function of receiving light and transporting a charge. The layers are divided into a so-called single-layer type photoreceptor that combines these functions, a layer that mainly contributes to charge generation, and a layer that contributes to charge retention when surface charge is retained in the dark and light is received. There is a so-called laminated type photoconductor in which layers are laminated. For image formation by electrophotography using these photoconductors,
For example, the Carlson process is applied. Image formation in this method involves charging a photoreceptor by corona discharge in a dark place, forming an electrostatic latent image such as a character or picture of a document on the charged photoreceptor surface, and forming the formed electrostatic latent image. The image is developed by toner, and the developed toner image is fixed on a support such as paper.After the toner image is transferred, the photoconductor is subjected to charge elimination, removal of residual toner, light elimination, etc. before reuse. Provided.

[0004] Various image forming processes are employed in the electrophotographic apparatus using the Carlson process.
The charging process is a corotron or scorotron system using a metal wire, a contact charging system using a charging brush or a charging roller, and the developing process is a two-component developing system, a non-magnetic one-component developing system, or a magnetic one-component developing system. Etc. are applied.

In recent years, electrophotographic photoreceptors using organic materials have been put to practical use due to their advantages such as flexibility, thermal stability, and film forming properties. For example, a photoreceptor composed of poly-N-vinylcarbazole and 2,4,7-trinitrofluoren-9-one (described in U.S. Pat. No. 3,484,237), Kaisho 47
Japanese Patent Application Laid-Open No. 47-10785), and a photoreceptor containing a eutectic complex comprising a dye and a resin as a main component (JP-A-47-10785).
Described in the official gazette). Currently, electrophotographic photoreceptors using such organic materials include metal-free phthalocyanines,
A function separation type laminated structure in which a charge generation layer composed of a resin binder with a metal phthalocyanine such as titanyl phthalocyanine, an azo compound and the like, and a charge transport layer composed of a resin binder with a hydrazone compound, a styryl compound, a diamine compound, a butadiene compound and the like are laminated. Are the mainstream.

[0006]

As described above, an organic material has many advantages that an inorganic material does not have, but at the same time, a material that sufficiently satisfies all the characteristics required for an electrophotographic photoreceptor is obtained. At present, there is a strong demand for the production of photoconductors that have high sensitivity and have little characteristic fluctuations due to long-term continuous use when mounted on an electrophotographic device and used for actual use. I have. In particular, there has been a growing market demand for a photoconductor having a margin enough to withstand long-time continuous use of various electrophotographic apparatuses having the above-described various image forming processes. Laminated organic photoconductors that have been put into practical use until now have insufficient photosensitivity in terms of electrical characteristics, and when used for a long time under practical conditions, decrease in charging potential, increase in residual potential, and decrease in sensitivity. If a problem occurs,
At present, there are various problems to be solved, and a technology capable of satisfying all required performances has not yet been established.

It is an object of the present invention to provide a photoreceptor which has high sensitivity and excellent repetition stability so that it can withstand continuous use for a long time when mounted on an actual image forming apparatus. System, scorotron system, various charging processes such as a contact charging system using a charging brush or a charging roller, and various developing processes such as a two-component developing system, a non-magnetic one-component developing system, and a magnetic one-component developing system. It is an object of the present invention to provide a photoconductor having a margin that can be used in various electrophotographic apparatuses.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, by including at least one specific furan or thiophene derivative in a photosensitive layer of an electrophotographic photosensitive member, the above object has been achieved. Have been achieved, and the present invention has been completed.

That is, the electrophotographic photoreceptor of the present invention comprises:
The photosensitive layer formed on the conductive substrate has the following general formula (I):(Where R ¹, R ², R³, R⁴And R⁵Are each water
Elemental atom, halogen atom, substituted or unsubstituted alkyl
Group, alkoxy group, cyano group, substituted or unsubstituted
A ring group, a substituted or unsubstituted aromatic group, R⁶And R
⁷Is a cyano group or an alkoxycarbonyl group, and X is oxygen
Atom or sulfur atom, n represents an integer of 0 or 1. )
Of the furan or thiophene derivatives shown by
It is characterized by containing at least one kind.

Further, another electrophotographic photoreceptor of the present invention comprises:
The photosensitive layer formed on the conductive substrate has the following general formula (II),(Where R ⁸, R ⁹, R¹⁰, R¹¹, R¹², R^Fifteen
And R¹⁶Represents a hydrogen atom, a halogen atom,
Or an unsubstituted alkyl group, alkoxy group, cyano group,
Substituted or unsubstituted heterocyclic group, substituted or unsubstituted
Aromatic group, R¹³And R¹⁴Is a cyano group or an alcohol
X represents a oxygen atom or a sulfur atom.
You. ) Or furan or thiophene derivative
Characterized in that it contains at least one kind
You.

The alkyl group and the alkoxy group in R ^{1 to} R ⁵ in the above formula (I) preferably have 1 to 8 carbon atoms.

The alkyl group and the alkoxy group represented by R ^{8 to} R ¹⁶ in the above formula (II) are also preferably those having 1 carbon atom.
~ 8.

The main causes such as a decrease in the charged potential due to continuous use of the photoreceptor, an increase in the residual potential, and a decrease in the sensitivity are corona discharge during charging by a corotron method, a scorotron method, a charging brush or a charging roller. During the repeated exposure to various stresses such as the contact charging process, image exposure, light exposure such as static elimination light, two-component development, non-magnetic one-component development, and magnetic one-component development, the photosensitive layer This is thought to be due to the generation of a carrier capture site called a trap. Therefore, if the occurrence of the trap is reduced, the problems to be solved such as the decrease in the charged potential, the increase in the residual potential, and the decrease in the sensitivity due to the continuous use of the photoreceptor are considerably improved.

The above-mentioned traps are generated at each of the charge generation layer, the charge generation layer / charge transport layer interface, and the charge transport layer in the laminated photoreceptor. In the case of a single-layer photoreceptor, the carrier generation process in the charge generation material in the photosensitive layer, the injection process at the interface between the charge generation material and the charge transport material, and the carrier transfer process between the charge transport materials are performed. That is, it occurs in the photosensitive layer.

Therefore, the present inventors have proposed the above-mentioned general formula (I)
Alternatively, it has been found that by incorporating at least one or more of the furan or thiophene derivatives represented by (II) in the photosensitive layer, there is an effect considered to cancel the trap generated during continuous use.

That is, the present inventors have intensively studied various organic materials in order to achieve the above object, and have carried out numerous experiments on these furan or thiophene derivatives. When used repeatedly in electrophotographic devices, it has been confirmed that the photoconductor characteristics show no change in potential characteristics or sensitivity characteristics over time even after long-term use with high sensitivity, and excellent stabilization of photoconductor characteristics is realized. I was able to. Conventionally,
An example of an electrophotographic photoreceptor using a furan or thiophene derivative represented by the general formula (I) or (II) for a photosensitive layer has not been known.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Specific examples of the furan or thiophene derivative represented by the general formulas (I) and (II) are as follows.

[0018]

[0019]

[0020]

[0021]

Examples of the charge generating substance which can be used in the present invention include various phthalocyanine compounds shown below as specific examples (III-1) to (III-6), and (III-7) to (III-
Examples of 24) include the following azo compounds and derivatives thereof. In the present invention, various compounds shown below as specific examples (IV-1) to (IV-12) can be used alone or in combination as the charge transporting substance. Further, as the resin binder for the charge transport layer, various polycarbonates and the like shown below as specific examples (V-1) to (V-7) can be used. Furthermore, in order to prevent ozone deterioration and the like which are obstacles in use when using the photoreceptor, an amine-based, phenol-based, sulfur-based, phosphite-based, phosphorus-based, benzopinacol-based, etc. Various antioxidants can be used. Specific examples of such antioxidants (VI-
1) to (VI-45) are shown below.

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

[0032]

[0033]

[0034]

[0035]

The photoreceptor of the present invention contains the above-mentioned compound in the photosensitive layer.
The description will be made based on the conceptual sectional view shown in FIG. FIG. 1 is a cross-sectional view showing a single-layer photoreceptor according to an example of the present invention, FIG. 2 is a cross-sectional view showing a negatively-charged laminated photoreceptor according to another example of the present invention, and FIG. FIG. 3 is a cross-sectional view illustrating a positively-charged laminated photoreceptor according to one example. 1 is a conductive substrate, 2 is a photosensitive layer, 3 charge generation layers, 4 charge transport layers, and 5 is a coating layer.

FIG. 1 shows that a photosensitive layer 2 in which a charge generating substance and a butadiene derivative serving as a charge transporting substance are dispersed in a resin binder (binder) is provided on a conductive substrate 1. It shows a photoreceptor provided with a coating layer 5, which is generally referred to as a single-layer type photoreceptor.

FIG. 2 shows a photosensitive layer 2 comprising a laminate of a charge generating layer 3 mainly composed of a charge generating substance and a charge transporting layer 4 containing a butadiene derivative as a charge transporting substance. Of the photoconductor, and is generally referred to as a laminated photoconductor.

FIG. 3 shows a photoreceptor having a layer configuration opposite to the layer configuration shown in FIG. In this case, it is general to further provide a coating layer 5 to protect the charge generation layer 3.

The photoreceptor shown in FIG. 1 can be manufactured by dispersing a charge generating substance in a solution in which a charge transporting substance and a resin binder are dissolved, and applying this dispersion on a conductive substrate. If necessary, a coating layer can be applied and formed.

In the photoreceptor shown in FIG. 2, a charge generating substance is vacuum-deposited on a conductive substrate, or a dispersion obtained by dispersing particles of the charge generating substance in a solvent or a resin binder is applied and dried. And a solution in which a charge transport material and a resin binder are dissolved is applied thereon and dried.

In the photoreceptor shown in FIG. 3, a solution in which a charge transporting substance and a resin binder are dissolved is applied to the conductive substrate 1 and dried, and a charge generating substance is vacuum-deposited thereon, or It can be produced by applying and drying a dispersion obtained by dispersing particles of a substance in a solvent and a binder resin binder, and further forming a coating layer 5. In addition, the furan or thiophene derivative represented by the general formula (I) or (II) according to the present invention may be used as the photosensitive layer of the single-layer type photoreceptor or the charge generating layer of the laminated type photoreceptor.
Alternatively, it is contained in the charge transport layer.

The conductive substrate 1 serves not only as an electrode of the photoreceptor but also as a support for the other layers, and may be cylindrical, plate-like or film-like. , A metal such as nickel, or a material obtained by performing a conductive treatment on glass, resin, or the like can be used. Casein, polyvinyl alcohol, nylon, polyamide, melamine, as a material of the polymer dispersion film used for surface modification of the substrate subjected to such conductive treatment,
Insulating polymer such as cellulose or conductive polymer such as polythiophene, polypyrrole, polyaniline,
Alternatively, those obtained by adding a metal oxide powder or a low molecular compound to these polymers can be used.

The charge generation layer 3 is formed by applying a material in which particles of a charge generation material are dispersed in a resin binder as described above, or by a method such as vacuum deposition, and receives light to generate charges. Occur. In addition, the charge generation efficiency is high, and at the same time, it is important to inject the generated charge into the charge transport layer 4. It is desirable that the electric field is less dependent on the electric field and the injection is good even at a low electric field. Examples of the charge generating substance include various phthalocyanines shown in specific examples (III-1) to (III-6), various azo compounds shown in (III-7) to (III-24) and derivatives thereof, and titanyl phthalocyanine. Pigment or dye such as phthalocyanine compound, quinone, indigo, cyanine, squarylium, azulhenium, pyrylium compound, or selenium or a selenium compound is used. You can choose. The charge generation layer needs to have a required charge generation function. This charge generation function is determined by the light absorption coefficient and the amount of the charge generation material in the layer. Generally, the thickness of the charge generation layer is 5 μm
The following are often used, and preferably 2 μm or less. The charge generation layer may be mainly composed of a charge generation substance, to which a charge transport substance or the like is added. As a resin binder for the charge generation layer, polycarbonate, polyester, polyamide, polyurethane, epoxy resin,
Polyvinyl butyral, polyvinyl acetal, phenoxy resin, silicone resin, acrylic resin, vinyl chloride resin, vinylidene chloride resin, vinyl acetate resin, homal resin, cellulose resin, or their copolymers, and their halides and cyanoethyl compounds alone And mixed.

The charge transport layer 4 is a coating film in which various compounds shown in the specific examples (IV-1) to (IV-12) are dispersed as a charge transport material in a resin binder. And retains the charge of the photosensitive layer, and exhibits the function of transporting the charge injected from the charge generation layer when receiving light. In the present invention, a furan or thiophene derivative represented by the general formula (I) or (II) is used as the electron-absorbing substance. The concentration of the furan derivative or thiophene derivative in the charge transport layer is preferably 0.01 to 3% by weight, more preferably 0.1 to 2% by weight. The thickness of such a charge transport layer is preferably from 10 to 40 μm. Specific examples of the resin binder for charge transport include (V-1) to (V-
In addition to the various polycarbonates described in 7), polymers and copolymers of polystyrene, polyacrylate, polyphenylene ether acryl, polyester, and methacrylate can be used. The specific examples (VI-1) to (VI-4) were used for the purpose of preventing ozone deterioration and the like which would be a hindrance in using the obtained photoreceptor.
An antioxidant such as an amine, phenol, sulfur, phosphite, or phosphorus antioxidant as shown in 5) can be contained in the charge transport layer 4.

The layer 5 has a function of receiving and holding the charge of the corona discharge in a dark place, and has a function of transmitting light sensitive to the photosensitive layer. In addition, in the multilayer 5,
At the time of exposure, it is necessary to transmit light to reach the photosensitive layer and to inject generated charges to neutralize and eliminate surface charges. As the coating material, an organic insulating film forming material such as polyester and polyamide can be used. In addition, these organic materials can be used in combination with an inorganic material such as glass resin and SiO ₂ , and further, a material such as a metal or a metal oxide that reduces electric resistance. As described above, it is desirable that the coating material is as transparent as possible in the wavelength region where the light absorption of the charge generating substance is maximum.

Although the thickness of the coating layer itself depends on the composition of the coating layer, it can be arbitrarily set within a range where adverse effects do not occur, such as an increase in residual potential when used repeatedly and continuously.

[0048]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below more specifically based on embodiments. In the following Examples and Comparative Examples, various negatively-charged laminated photoconductors were produced. In the following Examples and Comparative Examples, a conductive substrate obtained by washing and drying a cylindrical substrate made of aluminum having a thickness of 1 mm, a length of 310 mm, and an outer diameter of 60 mm was used. Example 1 10 parts by weight of an alcohol-soluble copolymerized polyamide resin (CM8000 manufactured by Toray Industries, Inc.) was dissolved in a solvent obtained by mixing 45 parts by weight of methanol and 45 parts by weight of methylene chloride, and the above-mentioned resin coating solution was used to prepare the solution. Dipped on the surface of an aluminum cylindrical substrate of
After drying for an minute, an intermediate layer having a resin film thickness of 0.1 μm was formed.

Next, 1 part by weight of a polyvinyl acetal resin (Slek KS-1 manufactured by Sekisui Chemical Co., Ltd.) and the bisazo compound 1 shown in Example III-17 as a charge generating substance were used.
Parts by weight and 150 parts by weight of methyl ethyl ketone, and subjected to a dispersion treatment for 48 hours in a ball mill. The obtained coating solution was dipped on the above-mentioned intermediate layer, and then dried at 90 ° C. for 30 minutes to form a charge generation layer having a resin film of 0.2 μm.

The hydrazone compound 5 shown in Example IV-1
0 parts by weight, hydrazone compound 50 shown in specific example IV-2
Parts by weight, 100 parts by weight of bisphenol A type-biphenyl copolymerized polycarbonate (trade name: TUFZET manufactured by Idemitsu Kosan Co., Ltd.) shown in Specific Example V-4, and 5 parts by weight of the hindered phenol compound shown in Specific Example VI-2 And 1 part by weight of the thiophene derivative shown in Example I-1 was dissolved in 700 parts by weight of dichloromethane to prepare a charge transport coating solution.
After applying this on the charge generation layer in the same manner as described above, 90
After drying at 30 ° C. for 30 minutes, a charge transport layer having a thickness of 20 μm was prepared.

Example 2 A photoconductor was prepared by the same way as that of Example 1 except that the thiophene derivative of Example 1 was replaced with the thiophene derivative represented by the above-mentioned compound I-5.

Example 3 A photoconductor was prepared by the same way as that of Example 1 except that the thiophene derivative of Example 1 was replaced with the thiophene derivative represented by the above-mentioned compound I-9.

Example 4 A photoconductor was prepared by the same way as that of Example 1 except that the thiophene derivative of Example 1 was replaced with the furan derivative represented by the above-mentioned compound I-13.

Example 5 A photoconductor was prepared by the same way as that of Example 1 except that the thiophene derivative of Example 1 was replaced with the thiophene derivative represented by the compound II-1.

Example 6 A photoconductor was prepared by the same way as that of Example 1 except that the thiophene derivative of Example 1 was replaced with the thiophene derivative represented by the above compound II-4.

Example 7 A photoconductor was prepared by the same way as that of Example 1 except that the thiophene derivative of Example 1 was replaced with the thiophene derivative represented by the above compound II-7.

Example 8 A photoconductor was prepared by the same way as that of Example 1 except that the thiophene derivative of Example 1 was replaced with the furan derivative represented by the above compound II-10.

Example 9 A photoconductor was prepared by the same way as that of Example 1 except that the charge generating substance of Example 1 was changed to the bisazo compound represented by the compound III-7.

Example 10 A photoconductor was prepared by the same way as that of Example 1 except that the charge generating substance of Example 1 was changed to the bisazo compound represented by the compound III-24.

Example 11 The same procedures as in Example 1 were carried out except that the charge transporting substance of Example 1 was replaced by 50 parts by weight of the hydrazone compound represented by the compound IV-3 and 50 parts by weight of the butadiene compound represented by the compound IV-4. A photoreceptor was prepared.

Example 12 The same procedures as in Example 1 were carried out except that the charge transporting substance of Example 1 was replaced by 50 parts by weight of the diamine compound represented by the compound IV-10 and 50 parts by weight of the distyryl compound represented by the compound IV-11. Similarly, a photoreceptor was prepared.

Example 13 A photoconductor was prepared by the same way as that of Example 1 except that the resin V-4 of the charge transport layer in Example 1 was replaced by the polycarbonate resin represented by the above compound V-2.

Example 14 A photoconductor was prepared by the same way as that of Example 1 except that the resin V-4 of the charge transport layer in Example 1 was replaced with the polycarbonate resin represented by the above compound V-6.

Example 15 As an additive to the charge transport layer of Example 1, the compound VI-
A photoconductor was prepared by the same way as that of Example 1 except for using the compound represented by 30.

Example 16 As an additive to the charge transport layer of Example 1, the compound VI-
A photoconductor was prepared by the same way as that of Example 1 instead of the compound of No. 37.

Comparative Example 1 A photoconductor was prepared in the same manner as in Example 1, except that the charge transport layer did not contain the thiophene derivative of Example 1.

Comparative Example 2 A photoconductor was prepared by the same way as that of Example 9 except that the thiophene derivative of Example 9 was not contained in the charge transport layer.

Comparative Example 3 A photoconductor was prepared by the same way as that of Example 11 except that the thiophene derivative of Example 11 was not included in the charge transport layer.

Comparative Example 4 A photoconductor was prepared by the same way as that of Example 13 except that the thiophene derivative of Example 13 was not contained in the charge transport layer.

Comparative Example 5 A photoconductor was prepared by the same way as that of Example 15 except that the charge transport layer did not contain the thiophene derivative of Example 15.

The electrophotographic characteristics of the photoreceptors prepared in the above Examples and Comparative Examples were evaluated by the following methods. Electrophotographic characteristics were measured using an electrostatic recording paper test apparatus. A photoreceptor was subjected to a corona discharge of -6.0 kV for 10 seconds in a dark place to negatively charge the photoreceptor surface.
The surface potential when held in a dark place for 2 seconds was measured, and the retention rate of the surface potential after 5 seconds was obtained. Subsequently, a time (s) until the surface potential is reduced to half by irradiating the surface of the photoreceptor with white light having an illuminance of 2 lux is determined to obtain a half-attenuated exposure amount E _1/2 (lu
xs), the electrophotographic characteristics of the photoreceptors prepared in comparison with the above examples were evaluated.

For the purpose of evaluating potential fluctuations during continuous use, the outputs of the charging mechanism, exposure mechanism, and static elimination mechanism were fixed in an analog copying machine having a scorotron charging process and a two-component developing system. Then, a running test of 50,000 sheets of A4 paper was performed in an atmosphere of normal temperature and normal humidity (20 ° C., 60% RH) with various photoconductors mounted thereon, and the potential of white paper (Vw) and the potential of black paper at the start and end of running By measuring (Vb), the potential change amounts (ΔVw, ΔVb) due to running were obtained. The results are shown in Table 1 below.

[0073]

[Table 1]

As is clear from the results of Examples 1 to 16 and Comparative Examples 1 to 5, the photoconductors prepared without adding the furan derivative or the thiophene derivative represented by the general formula (I) or (II) can It is hard to say that the potential fluctuation is large due to the running test and the photoconductor characteristics are excellent.
Further, from the comparison between Example 1 and Examples 9 and 10, it was found that stable photoreceptor characteristics were exhibited even when the charge generation material was changed. Further, the charge transport materials were used in Examples 11 and 12, and Examples 13 and 14 were used. Also, from Examples 15 and 16, it can be seen that the effects can be obtained even when the binder resin and the antioxidant of the charge transport layer are changed, so that it can be widely used in various material systems.

In addition to the case of the analog photocopier photoreceptor using an azo compound shown in the above embodiment, the metal-free phthalocyanine and titanyl phthalocyanine shown in the above (III-1) to (III-6) In the case of using a photoreceptor for a printer, a digital copier, and a facsimile, the furan derivative or the thiophene derivative of the present invention is included in the charge transport layer, so that the photoreceptor is mounted on an actual printer, digital copier, or facsimile. A similar effect was obtained.

Further, in the above embodiment, a copying machine having a scorotron system and a two-component developing system has been taken as a representative example.
As a result of application to various analog copiers, digital copiers, printers, and facsimile machines equipped with various charging processes of a charging brush system and a charging roller system, and a one-component developing system, the furan derivative or thiophene derivative of the present invention was similarly charged. With the photoconductor added to the transport layer,
Excellent repetition stability was shown.

[0077]

According to the photoreceptor of the present invention, the photosensitive layer on the conductive substrate contains the furan derivative or the thiophene derivative represented by the general formula (I) or (II), so that the photoreceptor can be used in an electrophotographic process. When used repeatedly, high sensitivity and excellent characteristics stability in continuous use over a long period of time can be obtained.

[Brief description of the drawings]

FIG. 1 is a conceptual cross-sectional view showing a single-layer type photoconductor as an example of the present invention.

FIG. 2 is a conceptual sectional view showing a positively-charged laminated photoconductor as another example of the present invention.

FIG. 3 is a conceptual cross-sectional view showing a negatively-charged laminated photoconductor as another example of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 conductive substrate 2 photosensitive layer 3 charge generation layer 4 charge transport layer 5 coating layer

Claims (2)

(57) [Claims] 1. A photosensitive layer formed on a conductive substrate comprises:
General formula (I),(Where R ¹, R ², R³, R⁴And R⁵Are each water
Elemental atom, halogen atom, substituted or unsubstituted alkyl
Group, alkoxy group, cyano group, substituted or unsubstituted
A ring group, a substituted or unsubstituted aromatic group, R⁶And R
⁷Is a cyano group or an alkoxycarbonyl group, and X is oxygen
Atom or sulfur atom, n represents an integer of 0 or 1. )
Of the furan or thiophene derivatives shown by
Electrophotographic photosensitive material characterized by containing at least one kind
body. 2. A photosensitive layer formed on a conductive substrate comprises:
General formula (II),(Where R ⁸, R ⁹, R¹⁰, R¹¹, R¹², R^Fifteen
And R¹⁶Represents a hydrogen atom, a halogen atom,
Or an unsubstituted alkyl group, alkoxy group, cyano group,
Substituted or unsubstituted heterocyclic group, substituted or unsubstituted
Aromatic group, R¹³And R¹⁴Is a cyano group or an alcohol
X represents a oxygen atom or a sulfur atom.
You. ) Or furan or thiophene derivative
Electrophotography characterized by containing at least one kind
Photoreceptor.