JPH09101623A - Electrophotographic photoreceptor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor for a copying machine and a printer having high sensitivity and excellent characteristics for repetition of use by using a new org. material as a charge transfer material in a photosensitive layer. SOLUTION: This electrophotographic photoreceptor has a photosensitive layer formed on a conductive base body. The photosensitive layer contains at least one kind of dithienyl deriv. expressed by formula or a dithienyl deriv. having another structure as a charge transfer material. In formula, R<1> , R<2> , R<3> , R<4> , R<5> , R<6> , R<7> are hydrogen atoms, halogen atoms, alkyl groups, aryl groups, or alkoxy groups.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoconductor for electrophotography, and more particularly to a photoconductor for electrophotography relating to improvement of a charge transport material used in a photosensitive layer.

[0002]

2. Description of the Related Art Conventionally, as a photosensitive material for an electrophotographic photoreceptor (hereinafter also referred to as a photoreceptor), an inorganic photoconductive substance such as selenium or a selenium alloy, or an organic photoconductive substance such as a phthalocyanine compound or a bisazo compound is used as a resin. The one dispersed in a binder or the like and the one coated in vacuum are used.

The photoconductor is required to have a function of holding a surface charge in a dark place, a function of receiving light to generate a charge, and a function of receiving light to transport a charge, but with one layer. A so-called single-layer type photoreceptor having these functions together,
There is a so-called multi-layer type photoconductor in which functionally separated layers are laminated mainly on a layer that contributes to charge generation and a layer that contributes to holding surface charges in a dark place and transporting charges when receiving light. For image formation by electrophotography using these photoconductors, for example, the Carlson method is applied. Image formation by this method is charging by corona discharge to a photoconductor in a dark place, formation of an electrostatic latent image such as characters and pictures of an original on the charged surface of the photoconductor, electrostatic latent image formed Of the toner image, the developed toner image is fixed to a support such as paper, and the photoconductor after the toner image transfer is subjected to removal of residual toner, light elimination, etc., and then reused. .

In recent years, many applications of photoconductive organic compounds having excellent charge transporting ability to photoconductors have been proposed due to their advantages such as flexibility, thermal stability and film forming property. For example, as an oxadiazole compound, US Pat.
JP-A-59-20 as pyrazoline compound
No. 23, and a hydrazone compound is disclosed in
No. 42380, JP-A-57-101844, JP-A-54-150128, and various other charge transport materials such as stilbene and benzidine derivatives.

[0005]

As described above, the organic material has many advantages that the inorganic material does not have, but at the same time, an organic material sufficiently satisfying all the properties required for the electrophotographic photoreceptor has been obtained. The current situation is that there is no such problem, and there was a problem with the sensitivity and the characteristics during repeated continuous use.

Therefore, an object of the present invention is to use a new organic material, which has never been used as a charge transporting material, in a photosensitive layer, thereby making it highly sensitive and excellent in repetitive characteristics for copying machines and electrophotography for printers. To provide a photoconductor.

[0007]

The object of the present invention is achieved by including at least one of the dithienyl derivatives represented by the following general formulas (I) to (V) as a charge transporting substance in the photosensitive layer of the photoreceptor. It That is, the present invention comprises the following configurations (1) to (5), respectively.

(1) The photosensitive layer formed on the conductive substrate is
The following general formula (I),(Where R ¹, R ², R ³, R ⁴, R ⁵, R ⁶And R
⁷Are hydrogen atom, halogen atom, alkyl group, and
It represents a reel group or an alkoxy group. ) Indicated by
Containing at least one of the
It is a photoconductor for electrophotography, which is characterized in that

(2) The photosensitive layer formed on the conductive substrate is
The following general formula (II),(Where R ¹¹, R ¹², R ¹³, R ¹⁴, R ^Fifteen, R
¹⁶, R ¹⁷, R ¹⁸, R ¹⁹And R ²⁰Are each
Hydrogen atom, halogen atom, alkyl group, aryl group,
Represents a lucoxy group. ) Of the dithienyl derivative
Characterized by containing at least one kind as a charge transport material
And a photoconductor for electrophotography.

(3) The photosensitive layer formed on the conductive substrate is
The following general formula (III),(Where R ²¹, R ²², R ²³, R ²⁴, R ²⁵And
And R ²⁶Is a hydrogen atom, halogen atom, alkyl group,
Represents a coxy group and an aryl group. ) Dithienyl
Contains at least one of the derivatives as a charge transport material
An electrophotographic photoreceptor characterized by the following.

(4) The photosensitive layer formed on the conductive substrate is
The following general formula (IV),(Where R ³¹, R ³², R ³³, R ³⁴, R ³⁵And
And R ³⁶Is a hydrogen atom, halogen atom, alkyl group,
Represents a coxy group and an aryl group. ) Dithienyl
Contains at least one of the derivatives as a charge transport material
An electrophotographic photoreceptor characterized by the following.

(5) The photosensitive layer formed on the conductive substrate is
The following general formula (V),(Where R ⁴¹, R ⁴², R ⁴³, R ⁴⁴, R ⁴⁵And
And R ⁴⁶Is a hydrogen atom, halogen atom, alkyl group,
Represents a coxy group and an aryl group. ) Dithienyl
Contains at least one of the derivatives as a charge transport material
An electrophotographic photoreceptor characterized by the following. The above general formula
Alkyl group represented by each R in (I) to (V), ar
The carbon number of the coxy group and the aryl group is preferably 1-8.
It is within the range.

Up to now, no examples have been known in which the dithienyl derivatives represented by the above general formulas (I) to (V) are used in the photosensitive layer of the photoreceptor. The present inventors, as a result of conducting many experiments on these dithienyl derivatives, in earnestly examining various organic materials in order to achieve the above-mentioned object,
Although its technical elucidation has not been sufficiently conducted, use of a dithienyl derivative having a specific skeleton represented by the general formulas (I) to (V) as a charge-transporting substance,
Found to be extremely effective in improving electrophotographic characteristics,
Thus, a photoconductor having high sensitivity and excellent repeatability was obtained.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The dithienyl derivatives of the general formulas (I) to (V) used in the present invention can be synthesized by a usual method. That is, the compound of the general formula (I) is obtained by, for example, preparing an aldehyde represented by the following general formula (A) and a compound represented by the general formula (B) in the presence of an alkali in a suitable solvent such as dimethylformamide. It can be easily synthesized by reacting with, for example, dimethoxyethane or the like.

[0015]

The compound represented by the general formula (II) is, for example, an aldehyde represented by the following general formula (C) and a general formula (D).
It can be easily synthesized by reacting the reagent represented by the formula (3) in the presence of an alkali in a suitable organic solvent such as dimethylformamide and dimethoxyethane.

The compound of the general formula (III) is, for example,
Synthesized easily by reacting an aldehyde represented by the following general formula (E) with a reagent represented by the general formula (F) in the presence of an alkali in a suitable solvent such as dimethylformamide or dimethoxyethane. can do.

The compound of the general formula (IV) can be prepared by reacting an aldehyde represented by the following general formula (G) and a hydrazine represented by the general formula (H) with a suitable organic compound in the presence of a catalyst such as an acid. It can be easily synthesized by dehydration condensation in a solvent such as ethanol.

Further, the compound represented by the general formula (V) is obtained by reacting an aldehyde represented by the following general formula (J) and a hydrazine represented by the following general formula (K) with a catalyst such as an acid. It can be easily synthesized by dehydration condensation in a suitable organic solvent such as ethanol.

Specific examples of the thus-obtained dithienyl derivatives represented by the general formulas (I) to (V) are as follows.

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

The photoconductor of the present invention contains the above-mentioned dithienyl derivative in the photosensitive layer. Depending on how the dithienyl derivative is applied, it is used as shown in FIG. 1, FIG. 2 or FIG. be able to.

1 to 3 are conceptual cross-sectional views of a photosensitive member of the present invention, in which 1 is a conductive substrate, 20, 21, 22 are photosensitive layers, and 3 is a photosensitive layer.
Is a charge generation material, 4 is a charge generation layer, 5 is a charge transport material,
6 is a charge transport layer, 7 is a coating layer.

In the photosensitive member shown in FIG. 1, a photosensitive layer 20 in which a charge generating substance 3 and a dithienyl derivative which is a charge transporting substance 5 are dispersed in a resin binder (binder) is provided on a conductive substrate 1. And is usually called a single-layer type photoconductor.

In the photoreceptor shown in FIG. 2, a charge generation layer 4 mainly composed of a charge generation substance 3 and a charge transport layer 6 containing a dithienyl derivative as a charge transport substance 5 are laminated on a conductive substrate 1. A photosensitive layer 21 composed of is provided, and is generally called a laminated type photoreceptor.

The photoconductor shown in FIG. 3 has a layer structure opposite to that shown in FIG. In this case, it is general to further provide a coating layer 7 to protect the charge generation layer 4.

The reason why the two types of layer structure shown in FIG. 2 and FIG. 3 are used is that the charge transport material suitable for the layer structure of FIG. This is because the layer structure shown in FIG. 3 is required at this stage as a positive charging type photosensitive member.

The photoconductor of FIG. 1 can be prepared by dispersing a charge generating substance in a solution in which a charge transporting substance and a resin binder are dissolved, and coating the dispersion on a conductive substrate.

The photosensitive member of FIG. 2 is obtained by vacuum-depositing a charge-generating substance on a conductive substrate, or applying a dispersion obtained by dispersing particles of the charge-generating substance in a solvent or a resin binder, and drying it. It can be prepared by applying a solution in which a charge transport substance and a resin binder are dissolved thereon and drying it.

In the photoconductor of FIG. 3, a solution in which a charge transport substance and a resin binder are dissolved is applied onto a conductive substrate and dried, and the charge generating substance is vacuum-deposited thereon, or particles of the charge generating substance are deposited. It can be prepared by coating a dispersion obtained by dispersing in a solvent or a resin binder, drying, and further forming a coating layer.

The conductive substrate 1 serves not only as an electrode of the photoconductor but also as a support for the other layers, and may be cylindrical, plate-shaped, or film-shaped, and is made of aluminum, stainless steel, A metal such as nickel, glass, resin, or the like that has been subjected to a conductive treatment can be used.

The charge generation layer 4 is formed by coating a material in which particles of the charge generation substance 3 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, it is important that the charge generation efficiency is high and at the same time that the generated charge is injected into the charge transport layer 6 and the coating layer 7, and the electric field dependency is small, and it is desirable that the injection is performed even in a low electric field.

As the charge generating substance 3, phthalocyanine compounds such as metal-free phthalocyanine and titanyl phthalocyanine, pigments or dyes such as various azo, quinone, indigo, cyanine, squarylium, azurenium and pyrylium compounds, and selenium or selenium compounds are used. Therefore, a suitable substance can be selected according to the light wavelength region of the exposure light source used for image formation. Since the charge generation layer only needs to have a charge generation function, its film thickness is determined by the light absorption coefficient of the charge generation substance, and is generally 5 μm or less, and officially 1 μm or less. The charge generation layer can be mainly composed of a charge generation substance and added with a charge transporting substance or the like. As the resin binder, polycarbonate, polyester, polyamide, polyurethane, vinyl chloride, phenoxy resin, polyvinyl butyral, diallyl phthalate resin, methacrylic acid ester polymers, copolymers and the like can be appropriately combined and used.

The charge transporting layer 6 is a coating film in which the dithienyl derivative represented by the general formulas (I) to (V) is dispersed as a charge transporting substance in a resin binder. It has the function of holding the electric charges of and transporting the electric charges injected from the electric charge generating layer at the time of receiving light.
As the resin binder, polymers, copolymers of polycarbonate, polyester, polystyrene, methacrylic acid ester and the like can be used. For the purpose of preventing ozone deterioration, which is a hindrance in use when the photoreceptor is used, an amine-based, phenol-based, sulfur-based, phosphite-based, or phosphorus-based antioxidant is added to the charge transport layer 6. It is also possible to contain.

The coating layer 7 has a function of receiving and holding the electric charge of corona discharge in a dark place, and also has a property of transmitting the light to which the charge generating layer 4 is sensitive, and transmits the light at the time of exposure. Therefore, it is necessary to reach the charge generation layer 4 and to inject the generated charges to neutralize and eliminate the surface charges. As the coating material, an organic insulating film forming material such as polyester and polyamide can be applied. In addition, these organic materials, glass resins, inorganic materials such as SiO ₂ , further metals,
A material such as a metal oxide that reduces electric resistance can be mixed and used. 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.

The film thickness of the coating layer itself depends on the compounding composition of the coating layer, but can be arbitrarily set within a range such that the residual potential does not increase when repeatedly used continuously.

[0044]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. Example 1 40 parts by weight of metal-free phthalocyanine and the above (I
-1) 100 parts by weight of the dithienyl derivative represented by the formula is used as a polyester resin (trade name: Byron 200: Toyobo Co., Ltd.)
(Manufactured) and 100 parts by weight of tetrahydrofuran and a solvent of tetrahydrofuran (THF) are kneaded with a mixer for 3 hours to prepare a coating liquid,
Aluminum vapor-deposited polyester film (A
I-PET) was coated by a wire bar method to prepare a photoreceptor so that the film thickness after drying was 20 μm.

Example 2 100 parts by weight of the dithienyl derivative represented by the formula (I-5) and a polycarbonate resin (trade name: Panlite L-1225, manufactured by Teijin Chemicals Ltd.) 10
A coating solution prepared by dissolving 0 part by weight in methylene chloride was applied onto an aluminum vapor-deposited polyester film substrate with a wire bar to form a charge transport layer so that the film thickness after drying was 15 μm. On the charge transport layer thus obtained,
50 parts by weight of titanyl phthalocyanine (TiOPc) pulverized by a ball mill for 150 hours, 50 parts by weight of polyester resin (trade name: Byron 200: manufactured by Toyobo Co., Ltd.), and kneaded with a THF solvent for 3 hours with a mixer to prepare a coating solution. Then, the charge generation layer was formed by coating with a wire bar and having a film thickness after drying of 1 μm.

(Example 3) In Example 2, TiOP
Instead of c, for example, chlorodian blue, which is a bisazo pigment as disclosed in JP-A-47-37543, is used, and the charge-transporting substance is replaced by the dithienyl derivative of the formula (II-1). A photoconductor was prepared in the same manner as in Example 2.

(Example 4) 50 parts by weight of x-type metal-free phthalocyanine (H ₂ Pc) and 100 parts by weight of the dithienyl derivative represented by the formula (III-2) were added to a polyester resin (trade name: Byron 200: Toyobo Co., Ltd.). Made) 100 parts by weight and T
A coating solution was prepared by kneading with an HF solvent for 3 hours using a mixer, and was coated on an aluminum vapor-deposited polyester film (AI-PET), which is a conductive substrate, by a wire bar method, and the film thickness after drying was 20 μm. A photoconductor was prepared so that

Example 5 100 parts by weight of the dithienyl derivative represented by the formula (III-5) and a polycarbonate resin (trade name: Panlite L-1225, manufactured by Teijin Chemicals Ltd.)
A coating solution prepared by dissolving 100 parts by weight in methylene chloride was applied on an aluminum vapor-deposited polyester film substrate with a wire bar to form a charge transport layer so that the film thickness after drying was 20 μm. On the charge transport layer thus obtained, TiOP pulverized by a ball mill for 150 hours was used.
c 50 parts by weight, polyester resin (trade name: Byron 20
0: Toyobo Co., Ltd.) 50 parts by weight, kneaded with a THF solvent for 3 hours with a mixer to prepare a coating solution, which is coated with a wire bar and dried to have a film thickness of 1 μm. Was formed.

Example 6 In Example 5, TiOP was used.
Instead of c, the following structural formula, A photoconductor was prepared in the same manner as in Example 5 except that the squarylium compound represented by the formula (4) was used and the charge transporting material was replaced with the dithienyl derivative represented by the formula (IV-2).

(Example 7) In Example 5, TiOP
Chlorodian blue, which is a bisazo pigment similar to that in Example 3, was used in place of c, and the charge-transporting substance was represented by the above formula (I
A photoconductor was prepared in the same manner as in Example 5 in place of the dithienyl derivative of V-1).

The electrophotographic characteristics of the photoreceptor thus obtained were evaluated by using an electrostatic recording paper tester “SP-428” manufactured by Kawaguchi Electric.
It measured using. The surface potential V _S (volt) of the photoconductor is the initial surface potential when the surface of the photoconductor is positively charged by a corona discharge of +6 kV in a dark place, and then the photoconductor surface is irradiated with white light with an illuminance of 2 lux. Then, the time (second) until the surface potential becomes half is obtained and the half-attenuation exposure amount E _1/2 (l
ux. sec). Further, in Examples 1, 2, 4, 5 and 6, since favorable sensitivity for long wavelength light can be expected, electrophotographic characteristics when monochromatic light having a wavelength of 780 nm was also measured. That is, 1μ instead of white light
A monochromatic light of W (780 nm) is irradiated to obtain a half-attenuation exposure amount (μ
J / cm ² ) was determined. The measurement results are shown in Table 1 below.

[0052] Table 1 white light 780nm wavelength light _{V S (V) E 1/2 (} lux.sec) V S (V) E 1/2 (μJ / cm 2) Example 1 750 2.6 710 2. 8 Example 2 730 1.9 790 1.4 Example 3 760 2.0 --- Example 4 580 2.8 600 3.2 Example 5 640 2.3 660 1.8 Example 6 630 2.8 600 2.4 Example 7 660 2.5 ---

As can be seen from Table 1, Examples 1 to 7 show favorable characteristics in both the half-attenuation exposure amount and the surface potential. Further, in Examples 1, 2, 4, 5 and 6, high sensitivity is exhibited even with long-wavelength light having a wavelength of 780 nm, and it can be understood that it can be sufficiently used for semiconductor laser printers. Also, the change in surface potential (V _S ) was 70 V or less, particularly 50 V or less in Examples 1 to 3 even after 1000 times of repeated tests, and the half-attenuated exposure amount was also stable.

Example 8 As in Example 2, 50 parts by weight of metal-free phthalocyanine, vinyl chloride copolymer (trade name M)
(R-110: manufactured by Zeon Corporation) 50 parts by weight are kneaded together with methylene chloride for 3 hours with a mixer to prepare a coating solution,
The charge generation layer was formed by coating on an aluminum support to a thickness of about 1 μm. Next, 100 parts by weight of the dithienyl derivative represented by the formula (I-8), 100 parts by weight of a polycarbonate resin (Panlite L-1225) and 0.1 part by weight of silicone oil were mixed with methylene chloride to prepare a charge generation layer. The charge transport layer was formed by coating the above to a thickness of about 15 μm.

The photoconductor thus obtained was measured by using an electrostatic recording paper testing device "SP-428" manufactured by Kawaguchi Denki. Where the surface potential V _S of the photosensitive member (volts) of the corona discharge -6KV in the dark, the photoreceptor surface is negatively charged, it was measured electrophotographic characteristics when using monochromatic light having a wavelength of 780 nm, V _S = -760V, E _1/2 =
A good result of 1.4 μJ / cm ² was obtained.

(Example 9) In Example 8, the following structural formula was used instead of the metal-free phthalocyanine, A photoconductor was prepared in the same manner as in Example 8 except that the bisazo pigment represented by the formula (1) was used and the charge transport material was replaced by the dithienyl derivative represented by the formula (II-1). In the photoreceptor thus obtained, the monochromatic light was replaced with the white light in Example 8 and the measurement was carried out. V _S = −750 V, E _1/2 = 1.5
lux. Good results were obtained with sec.

(Example 10) In Example 8, the following structural formula was used instead of the metal-free phthalocyanine. A photoconductor was prepared in the same manner as in Example 8 except that the bisazo pigment represented by the formula (1) was used and the charge transport material was replaced by the dithienyl derivative represented by the formula (II-2). In the photoreceptor thus obtained, V _S = -730 V, E _1/2 = 1.
2 lux. Good results were obtained with sec.

(Example 11) In Example 8, the squarylium compound used in Example 6 was used in place of the metal-free phthalocyanine, and the charge transporting material was replaced with the dithienyl derivative represented by the formula (II-5). Then, a photoconductor was prepared in the same manner as in Example 8. In the thus obtained photoreceptor, V _S = −780 V, E _1/2 = 1.4 lux.
Good results were obtained with sec.

(Example 12) In the same manner as in Example 5, 50 parts by weight of metal-free phthalocyanine and 50 parts by weight of vinyl chloride copolymer (trade name MR-110: manufactured by Zeon Corporation) were mixed with methylene chloride in a mixer for 3 hours. Thus, a coating solution was prepared and coated on an aluminum support so as to have a thickness of about 1 μm to form a charge generation layer. Next, 100 parts by weight of the dithienyl derivative represented by the formula (III-8), 100 parts by weight of a polycarbonate resin (Panlite L-1225), and 0.1 parts by weight of silicone oil were mixed with methylene chloride to prepare a charge generation layer. The charge transport layer was formed by coating the above to a thickness of about 20 μm. In the photoconductor thus obtained, V _S = −700V, E _1/2 = 1.8 lux.
sec, a good result was obtained, and the change in the surface potential (V _S ) was 40 V or less, which was good even after 500 repeated tests.

Example 13 In Example 12, the metal-free phthalocyanine was replaced by the bisazo pigment used in Example 9, and the charge transport material was replaced by the dithienyl derivative represented by the above formula (IV-3). A photoconductor was prepared in the same manner as in Example 12. In the photoconductor thus obtained, V _S = −720 V, E _1/2 = 1.4 lux.
Good results were obtained with sec.

(Example 14) In Example 12, the metal-free phthalocyanine was replaced by the bisazo pigment used in Example 10, and the charge transporting material was replaced by the dithienyl derivative represented by the formula (V-4). A photoconductor was prepared in the same manner as in Example 12. In the photoconductor thus obtained, V _S = −680 V, E _1/2 = 1.3 lu
x. s, a good result was obtained.

[0062]

According to the present invention, since the dithienyl derivative represented by the above general formulas (I) to (V) is used as the charge transporting substance on the conductive substrate, high charge is achieved even in positive charging and negative charging. It is possible to obtain a photoconductor having high sensitivity and excellent repeatability. In addition, as the charge generating substance, a suitable substance can be selected according to the type of exposure light source,
For example, a phthalocyanine compound, a squarylium compound, and a certain bisazo compound can be used to obtain a photoconductor that can be used in a semiconductor laser printer. Furthermore, if necessary, a coating layer can be provided on the surface to improve the durability.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view showing a negatively charged laminated type photoreceptor as another example of the present invention.

FIG. 3 is a cross-sectional view showing a positively charged layered type photoconductor as still another example of the present invention. 1 Conductive Substrate 3 Charge Generating Material 4 Charge Generating Layer 5 Charge Transporting Material 6 Charge Transporting Layer 7 Covering Layer 20, 21, 22 Photosensitive Layer

Claims (5)

[Claims] 1. A photosensitive layer formed on a conductive substrate is as follows.
General formula (I),(Where R ¹, R ², R ³, R ⁴, R ⁵, R ⁶And R
⁷Are hydrogen atom, halogen atom, alkyl group, and
It represents a reel group or an alkoxy group. ) Indicated by
Containing at least one of the
A photoconductor for electrophotography, which is characterized in that 2. The photosensitive layer formed on a conductive substrate is as follows.
The general formula (II),(Where R ¹¹, R ¹², R ¹³, R ¹⁴, R ^Fifteen, R
¹⁶, R ¹⁷, R ¹⁸, R ¹⁹And R ²⁰Are each
Hydrogen atom, halogen atom, alkyl group, aryl group,
Represents a lucoxy group. ) Of the dithienyl derivative
Characterized by containing at least one kind as a charge transport material
Electrophotographic photoreceptor. 3. A photosensitive layer formed on a conductive substrate is as follows.
General formula (III),(Where R ²¹, R ²², R ²³, R ²⁴, R ²⁵And
And R ²⁶Is a hydrogen atom, halogen atom, alkyl group,
Represents a coxy group and an aryl group. ) Dithienyl
Contains at least one of the derivatives as a charge transport material
An electrophotographic photoreceptor characterized by the following. 4. A photosensitive layer formed on a conductive substrate is as follows.
General formula (IV),(Where R ³¹, R ³², R ³³, R ³⁴, R ³⁵And
And R ³⁶Is a hydrogen atom, halogen atom, alkyl group,
Represents a coxy group and an aryl group. ) Dithienyl
Contains at least one of the derivatives as a charge transport material
An electrophotographic photoreceptor characterized by the following. 5. The photosensitive layer formed on a conductive substrate is as follows.
General formula (V),(Where R ⁴¹, R ⁴², R ⁴³, R ⁴⁴, R ⁴⁵And
And R ⁴⁶Is a hydrogen atom, halogen atom, alkyl group,
Represents a coxy group and an aryl group. ) Dithienyl
Contains at least one of the derivatives as a charge transport material
An electrophotographic photoreceptor characterized by the following.