JP2001142237A - Electrophotographic photoreceptor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electrophotographic photoreceptor having high resolution and a long service life. SOLUTION: The electrophotographic photoreceptor is a positive charge type and has a monolayer type photosensitive layer containing at least an electric charge generating compound (e.g. phthalocyanines), a hole transferring compound (e.g. an arylamine compound) and an electron transferring compound (e.g. a perylene compound) on the electrically conductive substrate. The hole nobility of the photosensitive layer is >=1×105cm2/Vs at 3×105V/cm field intensity. The thickness of the photosensitive layer is preferably >=45 μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic photoreceptor for electrophotography, and more particularly to a single-layer type electrophotographic photoreceptor for positive charging.

[0002]

2. Description of the Related Art Conventionally, inorganic photoconductive substances such as selenium, cadmium sulfide, and zinc oxide have been widely used for a photosensitive layer of an electrophotographic photosensitive member. However, selenium and cadmium sulfide need to be recovered as poisons, selenium crystallizes by heat and therefore has poor heat resistance, cadmium sulfide and zinc oxide have poor moisture resistance, and zinc oxide has no printing durability. Has the disadvantage of In recent years, research on using an organic photoconductive substance for the photosensitive layer of an electrophotographic photoreceptor has made great progress, and its characteristics have surpassed inorganic photoreceptors in many respects. Most photoconductors have become organic photoconductors. Organic photoconductive materials are easier to deposit and are less costly than inorganic ones, are easily sensitive to long-wavelength light sources, have no toxicity of materials, and there is room for selection of photosensitive layer composition. It has the advantages that it can be large, can produce a transparent photoreceptor depending on the type, has flexibility, and can be processed into a belt shape.

[0003] In an organic electrophotographic photoreceptor, a so-called function-separated type photoreceptor in which the functions of generating and transferring charge carriers are shared by different compounds has much room for material selection and control of the characteristics of the photoreceptor. It is the mainstream of development because it is easy to do. From the viewpoint of the layer structure, a single-layer type photoreceptor having a charge generating agent and a charge transporting agent in the same layer, and a laminated type photoreceptor separated and laminated in separate layers (a charge generating layer and a charge transporting layer) It has been known. Of these, the stacked photoreceptor
Most of the current photoconductors are of this type from the viewpoint of photoconductor design because it is easy to optimize the function of each layer and control the characteristics. Most of such laminated photoconductors have at least a charge generation layer and a charge transport layer on a substrate in this order. In the charge transport layer, while there are very few suitable electron transport materials,
Many hole transporting materials having good properties are known. Therefore, in a stacked photoreceptor using such a hole transport material, a negative charging method is employed for charging. In such a negative charging system, when the photoconductor is charged by negative corona discharge, the generated ozone may adversely affect the environment and the characteristics of the photoconductor.

On the other hand, a single-layer type positively charged photoreceptor as described in JP-A-61-77054, JP-A-61-188543, JP-A-2-228670, JP-B-7-97223 and JP-A-7-97225 is used. In such a case, it is considered that such ozone generation is reduced as one advantage, and although it is often inferior to a negatively-charged laminated photoreceptor in terms of electrical characteristics, it is partially used in practice. . In addition to the effect on the generation of ozone, the single-layer type photoreceptor has advantages in that the number of coating steps is reduced, and that interference fringes to semiconductor laser light hardly occur. In addition to the advantages described above, the single-layer photoreceptor absorbs most of the incident light near the surface of the photosensitive layer and generates charges, so that the diffusion of irradiation light in the photosensitive layer can be almost ignored. In addition, there is an advantage that the charge transfer distance until the surface charge is neutralized after charging is smaller than that of the laminated photoreceptor. Therefore, image blur due to diffusion of light and charge carriers is less likely to occur,
In addition to expecting high resolution, even when the thickness of the photosensitive layer is increased, the degree of diffusion of charges and incident light does not change so much, and the resolution does not decrease much.

On the other hand, in the case of a stacked photoreceptor, since charge generation occurs near the substrate, the diffusion of incident light in the charge transport layer and the charge carriers injected from the charge generation layer increase as the film becomes thicker. In the case of a photosensitive layer having a thickness of 45 μm or more, considerable image blur occurs, and it has been difficult to put the photosensitive layer to practical use in a system requiring high resolution. On the other hand, in the photoconductor of the surface charge generation type according to the present invention, a photoconductor having a film thickness of 45 μm or more is possible. Thick film photoreceptors having a thickness of 45 μm or more have a large margin of film reduction due to abrasion in consideration of abrasion resistance, and have a longer life, that is, can be applied to the electrophotography process more times, that is, longer. . In addition, Journal of the Society of Electrophotography, Vol. 31, No. 2, pp. 149, 1
As described in 992, there is an advantage that the sensitivity is improved by increasing the film thickness. However, in the conventional single-layer type photoreceptor, the materials used, in particular, the charge transporting materials are limited, and practically no practical use has been made at present.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has high sensitivity and high responsiveness.
It is an object of the present invention to provide a single-layer type electrophotographic photoreceptor for positive charging, which has excellent durability when repeatedly used and has a long life and high printing durability.

[0007]

Means for Solving the Problems According to the present invention, as a result of intensive studies to solve the above-mentioned problems, as a result,
In an electrophotographic photosensitive member having a single-layer photosensitive layer containing at least a charge generating compound, a hole transporting compound, and an electron transporting pigment, the charge mobility of the photosensitive layer is 3 × 10 ^5.
It has been found that the above problem can be solved by setting the value to be 1 × 10 ⁵ cm ² / Vs or more at V / cm. The electrophotographic photoreceptor thus obtained has high sensitivity and high responsiveness, and is a photoreceptor having a long life and high printing durability, and is most suitable for an electrophotographic method requiring high speed and high resolution. .

[0008]

Embodiments of the present invention will be described below in detail. The layer structure of the present invention is shown in FIGS.
The configuration shown in FIG. 1 in which a basic photosensitive layer is directly formed on a conductive support, and the configuration shown in FIG. 2 in which an undercoat layer is provided between the conductive support and the photosensitive layer can be adopted. And if needed,
Needless to say, it may have an adhesive layer, an elastic layer, a surface protective layer, and the like.

Hereinafter, the layer constitution of the present photoreceptor will be described in detail. The photosensitive layer is laminated on a conductive support, and the conductive support includes, for example, a metal material such as aluminum, stainless steel, copper, nickel, zinc, indium, gold, and silver; a polymer such as polyester; paper; and glass. And the like, provided with a conductive layer of aluminum, copper, palladium, tin oxide, indium oxide, a conductive polymer, or the like on the surface of an insulating substrate such as. The surface of the conductive support can be subjected to various treatments within a range that does not affect the image quality. For example, surface oxidation treatment or chemical treatment can be performed. A metal drum or the like that has been subjected to a metal oxidation treatment by electrode oxidation or the like corresponds to this. The shape can be surface-cut or unprocessed drums, sheets,
Any shape such as a belt and a seamless belt can be adopted.

A phthalocyanine compound is preferred as the charge generating compound. Although the phthalocyanine compound is also used for the charge generation layer of the negatively charged laminated photoreceptor, the thickness of the phthalocyanine compound is 1 μm or less. Such a single-layer type photoreceptor is usually used at a film thickness of 50 times or more than that,
It is necessary that it does not itself trap electric charge. Further, unlike the case of the charge generation layer in the negatively charged laminated photoreceptor, in the single-layer type photoreceptor of the present invention, the charge generation material is used in a considerably dilute concentration region, and furthermore, the charge transporting material and the like are surrounded. , It is necessary to select a more compatible material in consideration of the surrounding materials and various physical properties such as electrical properties or dispersibility and liquid stability.

That is, the material used as the charge generation layer of the negatively charged laminated photoreceptor cannot always be used as it is for the single layer type photoreceptor. It is necessary to consider the dispersibility in the film, the stability of the coating solution, and the like. As a compound meeting such conditions, various crystalline phthalocyanine compounds having at least one element of titanium, gallium and silicon as a central metal can be suitably used. Examples thereof include various crystalline phthalocyanines such as titanyl phthalocyanine (also known as oxytitanium phthalocyanine), phthalocyanine obtained by crosslinking a compound having a hydroxyl group to titanium as a central metal, chlorogallium phthalocyanine, hydroxygallium phthalocyanine, and hydroxysilicon phthalocyanine. Among them, titanyl phthalocyanine, hydroxygallium phthalocyanine, and hydroxysilicon phthalocyanine are preferable, and the Bragg angle 2θ (± 0.2 °) of the X-ray diffraction diagram by CuKα ray is 9.5.
Crystalline titanyl phthalocyanine having peaks at °, 24.1 ° and 27.3 ° is more preferred. If the content of the phthalocyanine compound in the photosensitive layer is too small, the sensitivity is low, and light penetrates deeper into the photosensitive layer, to the substrate side, and electrons generated there are difficult to be discharged,
If the amount is too large, the chargeability is reduced. Therefore, the amount is preferably 1.5 to 20 parts by weight, more preferably 2 to 10 parts by weight, based on 100 parts by weight of the binder polymer.

The hole transporting compound plays a role of transporting holes after the charge generating material absorbs light to cause charge separation of electrons and holes. In the present invention, since the photoconductor is a single-layer, positive-charging system, holes are generated near the surface and move to the substrate. In particular, in a system using a high-speed electrophotographic process, it is necessary to use a material having a high hole mobility. Specifically, Time
-Of-Flight method, etc., the electric field strength 3 ×
At 10 ⁵ V / cm, it is essential that it be 1 × 10 ⁵ cm ² / Vs or more.

Suitable examples of the hole transporting compound include pyrazoline derivatives, carbazole derivatives, enamine derivatives, oxazole derivatives, hydrazone derivatives, stilbene derivatives, arylamine derivatives, butadiene derivatives,
Low molecular compounds such as oxadiazole derivatives, thiazole derivatives, thiadiazole derivatives, triazole derivatives, imidazole derivatives, imidazolone derivatives, imidazolidine derivatives, styryl compounds, benzothiazole derivatives, benzimidazole derivatives, acridine derivatives, and phenazine derivatives can be used. Among them, enamine derivatives, hydrazone derivatives, stilbene derivatives, arylamine derivatives, butadiene derivatives, and styryl compounds are preferred. The above hole transport type charge transport agents are used alone or in combination of two or more. The content of the hole transporting compound is not particularly limited, but is usually 10 parts by weight or more and 500 parts by weight or less, preferably 30 parts by weight or more and 150 parts by weight or less with respect to 100 parts by weight of the binder polymer.
More preferably, the amount is 40 parts by weight or more and 120 parts by weight or less.

The electron transporting pigment plays a role of transporting electrons after the charge generating material absorbs light to cause charge separation of electrons and holes. In the present invention, since the photoreceptor is a single-layer, positively-charged system, electrons generate near the surface and then move to the surface to cancel the surface charge. Since the electron travel distance is not always long,
Although the electron mobility does not necessarily need to be as high as the amount of the hole transporting agent, use a material that has sufficient electron removal because it causes a decrease in chargeability in the process where electrons remain in the photosensitive layer and continues. It is desirable to do. Further, a pigment that is incompatible with the binder resin is preferable from the viewpoint of gas resistance and a wide range of material selection than a compound that is compatible with the binder resin. Examples of such a compound include a perylene compound and an azo compound. Compounds, thiapyrylium salt derivatives, pyrylium salt derivatives, benzoquinone derivatives, naphthoquinone derivatives, anthraquinone derivatives, diphenoquinone derivatives, fluorenone derivatives and the like. Of these, perylene compounds are particularly preferably used. When the content of the electron transporting compound is too small, the electron transporting ability is insufficient, and when the content is too large, the chargeability is reduced.
0 parts by weight or less, preferably 1 part by weight or more and 25 parts by weight or less, more preferably 2 parts by weight or more and 10 parts by weight or less.

In forming the photosensitive layer, a binder polymer is used. In this case, the photosensitive layer can be obtained by applying and drying a coating solution obtained by dissolving or dispersing the phthalocyanine compound, the hole transporting compound, the electron transporting compound and various additives and a binder polymer in a solvent. As the binder polymer, for example, butadiene, styrene, vinyl acetate, vinyl chloride, acrylic acid ester, methacrylic acid ester, vinyl alcohol, polymers and copolymers of vinyl compounds such as ethyl vinyl ether, polyvinyl butyral, polyvinyl formal,
Partially modified polyvinyl acetal, polycarbonate, polyester, polyamide, polyurethane, cellulose ether, phenoxy resin, silicon resin, epoxy resin,
Poly-N-vinyl carbazole resin and the like can be mentioned. These can be used after being crosslinked by heat, light or the like using an appropriate curing agent or the like. These binders can be used alone or in combination of two or more.

An electron-withdrawing compound may be added to the photosensitive layer if necessary. Examples of the electron-withdrawing compound include cyano compounds such as tetracyanoquinodimethane, dicyanoquinomethane, and aromatic esters having a dicyanoquinovinyl group; nitro compounds such as 2,4,6-trinitrofluorenone; and condensation of perylene and the like. Polycyclic aromatic compounds; diphenoquinone derivatives; quinones; aldehydes; ketones; esters; acid anhydrides; phthalides; substituted and unsubstituted salicylic acid metal complexes; substituted and unsubstituted salicylic acid metal salts;
Metal complexes of aromatic carboxylic acids; metal salts of aromatic carboxylic acids. Preferably, a cyano compound, a nitro compound, a condensed polycyclic aromatic compound, a diphenoquinone derivative,
It is preferable to use substituted and unsubstituted metal complexes of salicylic acid, substituted and unsubstituted metal salts of salicylic acid, metal complexes of aromatic carboxylic acids, and metal salts of aromatic carboxylic acids.

Further, the above-mentioned photosensitive layer is a well-known plasticizer, antioxidant, ultraviolet absorber, leveling agent for improving film forming property, flexibility, coating property, mechanical strength, film forming property, durability and the like. May be contained. The thickness of the photosensitive layer is preferably at least 45 μm, more preferably at least 50 μm. The photoreceptor of the present invention can have a thicker photosensitive layer than a laminated photoreceptor. In preparing a coating solution for forming a photosensitive layer, compositions such as a phthalocyanine compound, a hole transporting compound, an electron transporting compound, and a binder polymer are mixed separately after being dispersed / dissolved in a dry system or an appropriate solvent. A method, or a method in which two or more of the compositions are dispersed or dissolved together and then mixed and the like are used as appropriate.

For dispersion, a ball mill, an ultrasonic disperser,
Use a paint shaker, attritor, sand grinder, etc. As a solvent used for dispersion or dissolution, butylamine, diethylamine, ethylenediamine, isopropanolamine, triethanolamine,
Triethylenediamine, N, N-dimethylformamide, acetone, methyl ethyl ketone, cyclohexanone, benzene, toluene, xylene, chloroform,
1,2-dichloroethane, 1,2-dichloropropane,
1,1,2-trichloroethane, 1,1,1-trichloroethane, trichloroethylene, tetrachloroethane,
Examples include dichloromethane, tetrahydrofuran, dioxane, methyl alcohol, ethyl alcohol, isopropyl alcohol, dimethyl glycol, ethyl acetate, butyl acetate, dimethyl sulfoxide, and methyl cellosolve. One of these dispersion media may be used alone, or two or more thereof may be used as a mixed solvent. This coating solution is dipped, ring-coated, sprayed, bar-coated, bladed, roll-coated,
The coating is performed by a coating method such as a wire bar coating method or a knife coater coating method, and then dried. Among them, a spray method is particularly preferably used as a method for coating a thick film having a thickness of 45 μm or more. The photoreceptor may have an undercoat layer, a transparent insulating layer,
Needless to say, a surface protective layer or the like may be provided.

The undercoat layer is usually used between the photosensitive layer and the conductive support, and a commonly used known layer can be used. Titanium oxide, aluminum oxide,
Inorganic fine particles such as zirconia and silicon oxide, organic fine particles such as organic pigments and crosslinked polymers, polyamide resins, phenolic resins, melamine resins, caseins, polyurethane resins, epoxy resins, resins such as cellulose, nitrocellulose, polyvinyl alcohol, polyvinyl butyral, etc. Can be used. These fine particles and resin can be used alone or as a mixture of two or more kinds. The thickness is usually 0.01 to 50 μm, preferably 0.01 to 50 μm.
10 μm.

When a surface protective layer is provided on the photoreceptor of the present invention, the protective layer can have a thickness of 0.01 to 20 μm,
Preferably it is 0.1 to 10 μm. The above-mentioned binder can be used for the protective layer, and the protective layer may contain the above-mentioned charge generating agent, charge transporting agent, additive, conductive material such as metal and metal oxide, and lubricant. In using the electrophotographic photoreceptor of the present invention, a corona charger such as a corotron and a scorotron, and a contact charger such as a charging roller and a charging brush are used. Exposure: halogen lamp, fluorescent lamp, laser (semiconductor, He-Ne), LE
D, a photoreceptor internal exposure system and the like are used, but as a digital electrophotographic system, it is preferable to use a laser, an LED, an optical shutter array or the like. In the development process, a dry development method such as cascade development, one-component insulated toner development, one-component conductive toner development, and two-component magnetic brush development, a wet development method, and the like are used. The transfer process includes electrostatic transfer methods such as corona transfer, roller transfer, and belt transfer, pressure transfer methods,
An adhesive transfer method is used. For fixing, heat roller fixing, flash fixing, oven fixing, pressure fixing and the like are used.
For cleaning, a brush cleaner, a magnetic brush cleaner, an electrostatic brush cleaner, a magnetic roller cleaner, a blade cleaner, and the like are used. The electrophotographic photoreceptor of the present invention obtained as described above has a higher sensitivity, a higher response, a higher printing durability, and a higher speed and longer life than a conventional photoreceptor. , Fax machine, plate making machine and the like.

[0021]

The present invention will be described below in more detail with reference to examples. However, the present invention is not limited to the following examples. In the following description, “parts” means “parts by weight”.
Represents Example 1 3 parts of oxytitanium phthalocyanine having a powder X-ray diffraction pattern by CuKα radiation shown in FIG. 3 and 8 parts of a perylene pigment having the following structural formula were mixed with toluene 180
Of the mixture, and dispersed by a sand grinder to obtain a pigment dispersion. On the other hand, 70 parts by weight of the hole transport material 1 and 100 parts of the polycarbonate resin in
And the above dispersion was mixed with a homogenizer so as to be uniform. The coating solution thus adjusted was applied as a support on a 75 μm-thick polyester film having an aluminum vapor-deposited layer to a dry film thickness of 5 μm.
The coating was performed so as to have a thickness of 8 to 59 μm to obtain a single-layer type electrophotographic photosensitive member.

[0022]

Embedded image

Example 2 Example 1 was repeated except that Compound 2 was used in place of Compound 1 in Table 1 for the hole transporting material.
An electrophotographic photoreceptor was obtained in the same manner as described above. (Comparative Examples 1 and 2) Table 1 shows the hole transport materials in Example 1.
An electrophotographic photoreceptor was obtained in the same manner as in Example 1 except that Compounds 3 and 4 were used in place of Compound 1. (Reference Examples 1 and 2) In Examples 1 and 2, the film thickness was 29 μm.
An electrophotographic photoreceptor was obtained in the same manner except for the above.

[0024]

[Table 1]

<Evaluation of Photoreceptor> The above photosensitivity was measured using a measuring apparatus (basic and application of electrophotographic technology, edited by the Electrophotographic Society, Corona Co., pp. 404-405) manufactured according to the electrophotographic society measurement standard. The body was affixed to an aluminum drum to form a cylinder, and conduction between the aluminum drum and the aluminum substrate of the photoreceptor was established. An electrical property evaluation test was performed by a cycle of charging, exposure, potential measurement, and static elimination.
Again, the initial surface potential was set to 700 V, and the exposure was 780 n
m, and neutralization was monochromatic light of 660 nm. The evaluation items include an exposure amount required to reduce the surface potential by half from 700 V to 350 V (half exposure amount, E _1/2 ), and 780 nm.
Surface light (V) at the time of irradiation of 1.4 μJ / cm ^{2 of}
L) was measured. In the VL measurement, the time required for the exposure-potential measurement was 100 ms and 200 ms.
Went in point. Table 2 shows the results. If the VL value at 100 ms is low, it is possible to cope with a high-speed process.
In the case of 00 ms, if the VL value is high and the VL value is small in 200 ms, it can be used in a medium to low speed process. On the other hand, if the VL value does not decrease even after 200 ms, it indicates that the used hole transport material is not suitable for the thick film photoreceptor of the present invention having a thickness of 45 μm or more.

[0026]

[Table 2]

(Example 3) A cylindrical aluminum drum (diameter 30 mm, length 247 mm) was used as a support, and a coating solution was prepared in the same manner as in Example 1.
An electrophotographic photosensitive drum having a thickness of 50 μm was prepared by immersion coating. This drum was loaded into a Brother Industrial Laser Printer HL-1040 and a printing test was performed. As a result, a good image without image blur was obtained. Further, even after printing 10,000 sheets in the single-sheet intermittent mode, film scraping was 5 μm. The degree was as small as about 10% of the initial film thickness, and almost no change was observed in the image.

Example 4 3 parts of oxytitanium phthalocyanine having a powder X-ray spectrum pattern by CuKα ray shown in FIG. 3 and 8 parts of a perylene pigment of the structural formula described in Example 1 were added to 154 parts of xylene, and were subjected to sand grinder. After dispersion, the mixture was diluted with 55 parts of xylene to obtain a dispersion. On the other hand, the hole transporting material 1 in
Parts by weight, 100 parts of polycarbonate resin in xylene 20
The resulting dispersion was dissolved in 20 parts, and the above dispersion was uniformly mixed with a homogenizer to prepare a coating solution.
This coating solution was applied by a spray coating method onto an aluminum drum (diameter: 78 mm, length: 350 mm) so that the thickness of the photosensitive layer was 45 μm, thereby producing a photosensitive drum. This photoreceptor drum was manufactured by DC-409 manufactured by Mita Kogyo.
0, and an image test was carried out. As a result, a good image free of image blur and the like was obtained.

(Comparative Example 3) A photosensitive drum was prepared and an image test was performed in the same manner as in Example 3 except that the film thickness was changed to 24 μm. This means that the initial film thickness was reduced to about 5 μm, which was about 21% of the initial film thickness. In addition, the life of the photoconductor was estimated to be less than half that of Example 4.

[0030]

As described above, according to the present invention, there is provided a single-layer type electrophotographic photoreceptor for positive charging, which has high sensitivity, high response, excellent repetition stability and printing durability, and has a long service life. The electrophotographic photoreceptor of the present invention is effectively used for digital electrophotographic copying machines, laser printers, and fax machines,
Further, the present invention can be applied to various plate making systems and light printing presses using electrophotographic technology.

[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 embodiment of the electrophotographic photosensitive member of the present invention.

FIG. 3 is a powder X-ray diffraction diagram of oxytitanium phthalocyanine used in Example 1.

[Explanation of symbols]

 1 conductive support, 2 photosensitive layer, 3 undercoat layer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H068 AA14 AA19 AA20 AA28 AA31 BA12 BA14 BA15 BA33 BA36 BA37 BA38 BA39 BA41 EA17 FC02

Claims (8)

[Claims] 1. An electrophotographic photosensitive member having a single-layer photosensitive layer containing at least a charge generating compound, a hole transporting compound and an electron transporting pigment on a conductive substrate. Is 1 × 1 at an electric field strength of 3 × 10 ⁵ V / cm.
0. ⁵ cm ² / Vs or more. 2. The positively charged electrophotographic photosensitive member according to claim 1, wherein the thickness of the photosensitive layer is 45 μm or more. 3. The method according to claim 1, wherein the electron transporting pigment is a perylene compound,
Azo compounds, thiapyrylium salt derivatives, benzoquinone derivatives, naphthoquinone derivatives, anthraquinone derivatives,
The positively chargeable electrophotographic photoreceptor according to claim 1, wherein the photoreceptor is at least one member selected from the group consisting of a diphenoquinone derivative and a fluorenone derivative. 4. The electrophotographic photosensitive member according to claim 1, wherein the electron transporting pigment is a perylene compound. 5. The electrophotographic photosensitive member according to claim 1, wherein the charge generating compound is a phthalocyanine compound. 6. A phthalocyanine-based compound having a crystal form that shows peaks at Bragg angles 2θ (± 0.2 °) of 9.5 °, 24.1 ° and 27.3 ° in an X-ray diffraction pattern by CuKα ray. The electrophotographic photosensitive member according to claim 5, which is titanyl phthalocyanine. 7. The charge-generating compound is a binder-polymer 1.
The electrophotographic photoreceptor according to any one of claims 1 to 6, wherein the content is 1.5 to 20 parts by weight based on 00 parts by weight. 8. The method for producing an electrophotographic photosensitive member according to claim 1, wherein the photosensitive layer is formed by a spray coating method.