JPH02236557A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To form a coated film so as to have excellent surface hardness and surface lubricity by using a mixture composed of polycarbonate resins consisting of two kinds of specific repeating units as a binder resin of a photosensitive layer. CONSTITUTION:The photosensitive layer is provided on a conductive base. This photosensitive layer contains one or more kinds of the polycarbonate resins consisting of the repeating units expressed by formula I and one or more kinds of the polycarbonate resins consisting of the repeating units expressed by formula II as the binder resin. In the formula I, R1 to R4 denote a hydrogen atom, alkyl group or halogen atom; R5 and R6 denote a a hydrogen atom, alkyl group or aryl group. In the formula II, R7 to R10 denote a hydrogen atom, halogen atom, alkyl group, fluorine atom-substd. alkyl group, aryl group or fluorine atom-substd. aryl group; R11 and R12 denote a hydrogen atom, alkyl group, fluorine atom-substd. alkyl group, aryl group or fluorine-substd. aryl group. The electrophotographic sensitive body which has the photosensitive layer having the high surface hardness and surface lubricity in combination is obtd. in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrophotographic photoreceptor, and more particularly to an electrophotographic photoreceptor using a silicon-containing polycarbonate resin as a binder resin.

2. Description of the Related Art In recent years, electrophotographic technology has been widely used in the fields of copying machines, laser beam printers, etc. because it has the advantage of being able to print at high speed and with high print quality.

As electrophotographic photoreceptors used in these electrophotographic techniques, those using inorganic photoconductive materials such as selenium, selenium-tellurium alloy, selenium-arsenic alloy, and cadmium sulfide are widely known. On the other hand, research on electrophotographic photoreceptors using organic photoconductive materials, which have advantages over electrophotographic photoreceptors using inorganic photoconductive materials in terms of cost and ease of manufacture and disposal, has become active. ing. Among these, functionally separated organic laminated photoreceptors, in which a charge generation layer that generates charges upon exposure and a charge transport layer that transports charges, are stacked are superior in terms of electrophotographic properties such as sensitivity, chargeability, and repeated stability. It is excellent, and various proposals have been made and it has not yet been put into practical use.

Among these organic layered photoreceptors, some have been developed that exhibit sufficient electrophotographic properties as described above.
Durability against mechanical external forces, that is, problems in which image defects occur due to abrasion or scratches on the surface of the photoreceptor due to direct loads from toner, image forming agent, paper, cleaning members, etc.;
Alternatively, there are image defects caused by low resistance substances such as ozone and nitrogen oxides generated by corona discharge, paper dust generated by copy paper, and toner components that adhere and accumulate on the photoconductor surface. It limits lifespan.

Various measures have been considered to solve these problems. For example, methods using polymethyl methacrylate, polyester, polycarbonate resin, etc. as a binder resin for the surface layer of the photoreceptor (Japanese Patent Laid-Open No. 57-4051 Publications, etc.) or those containing a lubricant in the binder resin of the photoreceptor surface layer (JP-A-63-2072 and JP-A-83-5865)
Publication No. 8》 etc. have been proposed.

Problems to be Solved by the Invention However, although the electrophotographic photoreceptors of relatively good durability can be obtained in these cases, they are still not fully satisfactory. That is, in the former case, the pencil hardness of the formed coating film remains in the range of Ha to H, and therefore the surface hardness of the electrophotographic photoreceptor formed is not sufficiently satisfactory, and is in the range of 40,000 to 50,000. The problem remains that image quality defects occur due to abrasion and scratches on the surface of the photosensitive layer due to copying operations on the order of one sheet.
Furthermore, in the latter case, there remains the problem that after copying approximately 40,000 to 50,000 sheets, image deletion occurs due to the accumulation of deposits on the surface of the photoreceptor. Therefore, it has been desired to develop a binder resin that will prevent the formation of a photosensitive layer having high surface hardness.

The present invention has been made in view of the above-mentioned circumstances, and aims to solve the above-mentioned problems in the conventional technology.

That is, an object of the present invention is to provide an electrophotographic photoreceptor having a photosensitive layer having both high surface hardness and surface lubricity.

Means for Solving the Problems As a result of various studies regarding the binder resin of the photosensitive layer, the present inventors found that a polycarbonate resin consisting of repeating units represented by the following general formula (I>) has extremely excellent surface hardness and By using it together with a polycarbonate resin that has lubricity and is composed of repeating units represented by the following general formula (II>), the above-mentioned problems, such as image quality defects due to abrasion and scratches on the surface of the photosensitive layer, and paper dust can be solved. The present inventors have discovered that it is possible to eliminate the occurrence of image deletion due to adhesion and accumulation at the same time, and to dramatically improve the life of an electrophotographic photoreceptor, and have completed the present invention.

The present invention provides an electrophotographic photoreceptor comprising a photosensitive layer provided on a conductive substrate, in which the photosensitive layer contains one or more polycarbonate resins consisting of repeating units represented by the following general formula (I>) as a binder resin. or more (in the formula, Rl, R2, R3 and R4 each represent a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or a halogen atom, and R5 and R6 each represent a hydrogen atom or a halogen atom having 1 to 4 carbon atoms) represents an alkyl group or aryl group) and one or more polycarbonate resins consisting of repeating units represented by the following general formula (II>) (in the formula, R
7, R8, R9 and Rso each represent a hydrogen atom, a halogen atom, an alkyl group, a fluorine atom-substituted alkyl group, an aryl group, or a fluorine atom-substituted aryl group, and R
o and R12 each represent a hydrogen atom, an alkyl group, a fluorine atom-substituted alkyl group, an aryl group, a fluorine atom-substituted aryl group, or an atomic group bonded to each other to form a carbon ring. However, R7, R8, R9, R10qRo
At least one of R12 and R12 represents a fluorine atom, a fluorine atom-substituted alkyl group, or a fluorine atom-substituted aryl group. 》It is characterized by containing the following.

The present invention will be explained in detail below.

The conductive substrate in the electrophotographic photoreceptor of the present invention includes:
Conductive materials such as aluminum, nickel, chromium, titanium, palladium, indium oxide, tin oxide, graphite, etc. are deposited on metal plates such as aluminum, brass, copper, nickel, and steel, or on plastic sheets.
It is possible to use materials that have been subjected to conductive treatment by coating by sputtering, coating, etc., or materials that have been subjected to conductive treatment such as glass, plastic plates, cloth, and paper.

A photosensitive layer of a dispersed type, a laminated type, etc. is placed on the conductive substrate, and if necessary, an undercoat layer having a barrier function or an adhesive function is provided between the photosensitive layer and the conductive substrate. It may be provided. As materials constituting the undercoat layer, resins such as polyvinyl petyral, polyvinyl alcohol, casein, polyamide, cellulose, gelatin, polyurethane, and polyester, and metal oxides such as aluminum oxide can be used.

The photosensitive layer formed on the conductive substrate may have a single N structure, or may have a laminated structure in which a charge generation layer and a charge transport layer are functionally separated. In the case of a laminated structure, the charge generation layer and the charge transport layer may be stacked in any order.

These photosensitive layers are composed of a coating film in which a charge generating substance, a charge transporting substance, or both are contained in a binder resin.

As charge generating substances, amorphous selenium, crystalline selenium,
Selenium-tellurium alloy, selenium-arsenic alloy, other selenium compounds and alloys, inorganic photoconductors such as zinc oxide and titanium oxide, cyanine-based, squarium-based, anthrone-based, perylene-based, azo-based, anthracene-based,
Organic pigments and dyes such as pyrene, biryllium salts, and thiapyrylium salts are used.

As the charge transport substance, quinone compounds such as p-penzoquinone, chloranil, promoanil, anthraquinone,
Tetracyanoquinodimethane compound, 2, 4. 7-
7-fluorenone compounds such as trinitrofluorenone and 2,4,5.7-tetranitrofluorenone, fluorenone-9-malononitrile compounds, xanthone compounds,
Electron-withdrawing substances such as benzophenone compounds, cyanovinyl compounds, ethylene compounds, pyrazoline compounds, hydrazone compounds, oxazole compounds, carbazole compounds, arylalkane compounds, triphenylamine compounds, aryl-substituted ethylene compounds ,
An electron-donating substance such as a benzidine compound, a stilbene compound, an anthracene compound, or a polymer having a group consisting of these compounds in its main chain or side chain is used.

Among these, it is particularly preferable to use triphenylamine compounds represented by the following general formula (DI>).

(In the formula, R13 and R14 each represent day or CH3, and R15 represents H, CH3, C2H5 or CI.) In the present invention, as the binder resin, the general formula (I>
A polycarbonate resin consisting of repeating units represented by I and Although it can be used as a binder resin for both layers and charge transport layers, it is preferable to use it at least for the layer forming the surface.In particular, it is used as a binder resin when the surface is composed of a charge transport layer. is preferable.

The polycarbonate resin composed of repeating units represented by the above general formula (E) used in the present invention has an average molecular weight of 10,000 to 300,000, preferably 20,000 to 200,000.

Specific examples of the polycarbonate resin represented by the general formula (E) that can be suitably used in the present invention include those having the following repeating units as constituent components.

The polycarbonate resin represented by the above general formula (I>) in the present invention can be easily synthesized according to a conventional method using a phenolic compound represented by the following general formula (IV).

(In the formula, R1 to R6 have the same meanings as described above.) Specifically, phosgene is introduced into the phenolic compound using pyridine or an aqueous alkaline solution as an acid binder in the presence of a methylene chloride solvent. It can be produced by carrying out a reaction. When using an alkaline aqueous solution such as sodium hydroxide as an acid binder,
After mixing appropriate amounts of the phenolic compound, sodium hydroxide, water, methylene chloride, etc., and introducing phosgene,
Polymerization can be carried out by adding a tertiary amine compound such as trimethylamine or triethylamine as a catalyst, as well as appropriate amounts of sodium hydroxide and water.As a molecular weight regulator,
A method can be adopted in which a monofunctional compound such as phenol or p-tertiary butylphenol is added before, during, or after phosgenation. Next, a typical manufacturing example will be shown.

Synthesis Example 1 Phenolic compound represented by the following structural formula (IV-1>) 0.2 mol Sodium hydroxide 18 g Water
250 m. I! Methylene chloride, 1501 Tertiary butylphenol 0.4 g or more of the substance, 2. l! 40 g of phosgene was blown into the reactor for 2 hours while stirring, and 0.0 g of triethylamine was added to the reactor. 05 g, 5 g of sodium hydroxide, 30 m. of water. 1) was added, and polymerization was carried out at 25°C for 4 hours. After the polymerization, 400 rIT1 of methylene chloride was added to dilute, washed with hydrochloric acid, washed with water, and the methylene chloride was evaporated to obtain about 55 g of a polycarbonate resin consisting of repeating units represented by the following structural formula (I-1). An average molecular weight of about 30,000) was obtained.

? Example 2 Phenolic compound represented by the following structural formula (IV-2) 0 2 mol Sodium hydroxide 189 Water
250 wl methylene chloride 150 mN Tertiary Butylphenol Substances of 0.49 or higher, 21
A polymerization reaction was carried out in the same manner as in Synthesis Example 1 to produce about 58 g of polycarbonate resin (average molecular weight: about 3
1,000,000).

Synthesis Example 3 Phenolic compound represented by the following horizontal formula (IV-3> 0.2 mol Sodium hydroxide 18 g Water
250 Methylene monochloride
15() mNp - tertiary butylphenol 0.49 or more substances were charged into a 2N reaction vessel, and a polymerization reaction was carried out in the same manner as in Synthesis Example 1 to repeat the polymerization shown by the following structural formula (I-3). About 60 g of polycarbonate resin (average molecular weight, about 30,000 yen) is {q.

Synthesis Example 4 Phenolic compound represented by the following structural formula (IV-4) 0.2 mol Sodium hydroxide 18 g Water
250 mN methylene chloride 150llIJ! p-tertiary butylphenol 0.49 or more substances,
2. l! was charged into a reaction vessel, and a polymerization reaction was carried out in the same manner as in Synthesis Example 1 to obtain about 63 g (average molecular weight: about 30,000) of a polycarbonate resin consisting of repeating units represented by the following structural formula (I-4>).

In the present invention, known polycarbonate trees comprising repeating units represented by the above general formula (II) are used. Usually, those having an average molecular weight in the range of 110,000 to 200,000 are used. Specifically, for example, those having the following repeating units as constituents are exemplified.

In the present invention, the content ratio of the polycarbonate resin represented by the general formula (I>) and the polycarbonate resin represented by the general formula (II) can be arbitrarily set, but the former:latter=90:1 to It is preferable to use the content ratio in the range of 5:95.

In the present invention, when the photosensitive layer has a laminated structure, the charge generation layer is formed by applying a coating solution obtained by dissolving or dissolving the charge generation substance and the binder resin in an appropriate solvent, and drying. can do. As a binder resin,
In addition to polycarbonate resins consisting of repeating units represented by the above general formulas (I) and (II), known binder resins such as polystyrene, polyvinyl chloride,
Polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, polyvinyl acetal, alkyd resin, acrylic resin,
Polyacrylonitrile, polycarbonate, polyamide, polyketone, polyacrylamide, butyral resin,
Conventionally known resins can be used, such as thermoplastic resins such as polyester, thermosetting resins such as polyurethane, epoxy resins, and phenol resins.

The thickness of the charge generation layer is usually 0.05 to 40 mm, preferably 0.05 mm. It is set to 05 to 25 μs.

Further, the charge transport layer can be formed by applying a solution in which the above-mentioned charge transport substance and the above-mentioned copolymerized polycarbonate resin are dissolved in a suitable solvent and drying the solution. Many useful organic solvents can be used as the solvent used to form the charge transport layer. Typical examples include aromatic hydrocarbons such as benzene, toluene, xylene, and chlorobenzene, ketones such as acetone and 2-butanone, and halogenated aliphatic carbons such as methylene chloride, chloroform, and ethylene chloride. Hydrogens, cyclic or linear solvents such as tetrahydrofuran, dioxane, ethylene glycol, diethyl ether, etc., or mixed solvents thereof can be used.

The thickness of the charge transport layer is 2 to 100 iIM, preferably 1
0-40 can be set immediately.

Example Hereinafter, the present invention will be specifically explained with reference to Examples.

Example 1 An aluminum pipe was used as a conductive substrate, and a coating solution consisting of 10 parts by weight of alcohol-soluble polyamide resin, 150 parts by weight of methanol, and 40 parts by weight of water was applied onto the pipe by dip coating, and dried to a film thickness of 1. A subbing layer was formed.

Furthermore, a mixture consisting of 90 parts by weight of trigonal selenium (manufactured by Xerox Corporation, USA), 10 parts by weight of modified polyvinyl butyral resin, and 300 parts by weight of n-butanol was dispersed, and n-butanol was added to 1 part by weight of the resulting dispersion. A solution diluted by adding 2 parts by weight was applied onto the above-mentioned undercoat layer by a dip coating method and dried to form a charge generation layer having a film thickness of 0.3 mm.

Next, N,N'-diphenyl-N,N'-bis(3-methylphenyl)-[1.1'-biphenyl]-4.4
5 parts by weight of a polycarbonate resin consisting of the repeating unit represented by the structural formula (1-1) obtained in Synthesis Example 1, and the structural formula (n-1)
5 parts by weight of a polycarbonate resin (average molecular weight approximately 30,000) consisting of repeating units represented by
The resulting solution was applied by dip coating onto the above charge generation layer and dried to give a film thickness of 2.0 parts by weight.
A charge transport layer of 0#l was formed to produce an electrophotographic photoreceptor consisting of three layers.

The electrophotographic photoreceptor produced as described above was loaded into a copying machine equipped with a blade cleaning member, and the cost was 100,000 yen.
We investigated the occurrence of image defects due to abrasion and scratches on the surface of the electrophotographic photoreceptor, the amount of surface abrasion, and the occurrence of image deletion under high temperature and high humidity environments when copying 0 copies. The surface pencil hardness was investigated. The results are shown in Table 1.

Example 2 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-1) obtained in Synthesis Example 1 and the structural formula (I[-2
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight: approximately 30,000) consisting of repeating units represented by was used. We conducted an evaluation. The result is the first
Shown in the table.

Example 3 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-1> obtained in Synthesis Example 1) and the structural formula (n-3>
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecule maximum of about 30,000) consisting of repeating units represented by was used. An evaluation was conducted and the results are shown in Table 1.

Example 4 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-1) obtained in Synthesis Example 1 and the structural formula (II-4) were used.
) An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight approximately 30,000) consisting of repeating units represented by We conducted an evaluation. The result is the first
Shown in the table.

Example 5 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-2> obtained in Synthesis Example 2) and the following structural formula (n-1
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight: approximately 30,000) consisting of repeating units represented by was used. We conducted an evaluation. The result is the first
Shown in the table.

Example 6 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-2) obtained in Synthesis Example 2 and the structural formula (II-2) were used.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight: approximately 30,000) consisting of repeating units represented by was used. We conducted an evaluation. The result is the first
Shown in the table.

Example 7 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-2> obtained in Synthesis Example 2) and the structural formula (I-3) were used.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1 above, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight approximately 30,000) consisting of repeating units represented by was used, and evaluated in the same manner. I did this. The results are shown in Table 1.

Example 8 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin composed of repeating units represented by the structural formula (I-2) obtained in Synthesis Example 2 and the structural formula (n-3>
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecule maximum of 30,000) consisting of repeating units represented by was used. We conducted an evaluation. The results are shown in Table 1.

Example 9 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-3) obtained in Synthesis Example 3 and the structural formula (n-1) were used.
) An electrophotographic photoreceptor was prepared in the same manner as in Example 1 above, except that a mixture with 5 parts by weight of polycarbonate resin {average molecular weight: approximately 30,000} was used. We conducted an evaluation. The result is the first
Shown in the table.

Example 10 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (It-3) obtained in Synthesis Example 3 and the structural formula (It-2) were used.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight: approximately 30,000) consisting of repeating units represented by was used. We conducted an evaluation. The result is the first
Shown in the table.

Example 11 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-3) obtained in Synthesis Example 3 and the structural formula (If-3) were used.
) An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight approximately 30,000) consisting of repeating units represented by We conducted an evaluation. The result is the first
Shown in the table.

Example 12 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (E-3) obtained in Synthesis Example 3 and the structural formula <It-4> were used.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight: approximately 30,000) consisting of repeating units represented by was used. We conducted an evaluation. The result is the first
Shown in the table.

Example 13 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (E-4) obtained in Synthesis Example 4 and the structural formula (I[
An electrophotographic photoreceptor was prepared in the same manner as in Example 1 above, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight approximately 30,000) consisting of repeating units represented by -1> was used. Evaluation was conducted in the same manner. The results are shown in Table 1.

Example 14 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-4> obtained in Synthesis Example 4) and the structural formula (n-2>
An electrophotographic photoreceptor was prepared in the same manner as in Example 1 above, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight approximately 30,000) consisting of repeating units represented by was used, and evaluated in the same manner. I did this. The results are shown in Table 1.

Example 15 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-4) obtained in Synthesis Example 4 and the structural formula (It-3) were used.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 5 parts by weight of polycarbonate resin (average molecular weight approximately 30,000) consisting of repeating units represented by > was used. was evaluated. The result is the first
Shown in the table.

Example 14 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (II-4) obtained in Synthesis Example 4 and the structural formula (II-4) were used.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight: approximately 30,000) consisting of repeating units represented by was used. We conducted an evaluation. The result is the first
Shown in the table.

Comparative Example A commercially available polycarbonate resin (manufactured by Teijin, Vanlite K-1300) was used as the binder resin for the charge transport layer.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that parts by weight were used, and evaluation was performed in the same manner. The results are shown in Table 1.

Since the mixture of the polycarbonate resin shown in Table 1 and the polycarbonate resin consisting of the repeating unit represented by the above general formula (n) is used, the formed coating film has extremely excellent surface hardness and surface lubricity. Therefore, the electrophotographic photoreceptor of the present invention has excellent durability, suppresses the occurrence of image defects due to abrasion and scratches on the surface of the photosensitive layer, and at the same time eliminates the occurrence of image fading due to adhesion and accumulation of paper dust, etc., and has a long lifespan. will improve dramatically.

Patent applicant Fuji Xerox Co., Ltd. Agent
Effects of Patent Attorney Tsuyoshi Watanabe's inventions

Claims (2)

[Claims] (1) In an electrophotographic photoreceptor comprising a photosensitive layer provided on a conductive substrate, the photosensitive layer contains one or more polycarbonate resins consisting of repeating units represented by the following general formula (I) as a binder resin. Above ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (I) (In the formula, R_1, R_2, R_3 and R_4 each represent a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or a halogen atom, and R_5 and R_6 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an aryl group, respectively. etc.▼(II) (In the formula, R_7, R_8, R_9 and R_1_0 each represent a hydrogen atom, a halogen atom, an alkyl group, a fluorine atom-substituted alkyl group, an aryl group, or a fluorine atom-substituted aryl group, and R_1_1 and R_1_2 each represents a hydrogen atom, an alkyl group, a fluorine atom-substituted alkyl group, an aryl group, a fluorine atom-substituted aryl group, or an atomic group that combines with each other to form a carbon ring.However,
At least one of R_7, R_8, R_9, R_1_0, R_1_1 and R_1_2 represents a fluorine atom, a fluorine atom-substituted alkyl group, or a fluorine atom-substituted aryl group. ) An electrophotographic photoreceptor characterized by containing: (2) A compound represented by the above general formula (I) and a compound represented by the general formula (
The content ratio with the compound shown in II) is 90:1 to 5:95.
The electrophotographic photoreceptor according to claim 1, characterized in that: