JPS61228451A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To enhance sensitivity and to reduce changes of the potential in the light and that in the dark at the time of repeated cycles of electrostatic charging and exposure by forming a layer contg. a specified compd. CONSTITUTION:The layer contains the compd. represented by formula I embodied by formula I-1, and in a preferable example, an electrophotographic sensitive body functionally is separated into a charge generating layer and a charge transfer layer and this layer can use the compd. of formula I as the charge transfer material and its preferable thickness is 8-20mum.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to electrophotographic photoreceptors, and more particularly to electrophotographic photoreceptors having a low molecular organic photoconductor that provides improved electrophotographic properties.

2. Description of the Related Art Conventionally, inorganic photoconductive materials such as selenium, cadmium sulfide, and zinc oxide have been known as photoconductive materials used in electrophotographic photoreceptors. These photoconductive materials have many advantages, such as being able to be charged to an appropriate potential in the dark, having little charge dissipation in the dark, and being able to rapidly dissipate charge when irradiated with light. On the other hand, it has various drawbacks. For example, selenium-based photoreceptors easily crystallize due to factors such as temperature, humidity, dust, and pressure.
%, when the ambient temperature exceeds 400 i, crystallization becomes significant, resulting in deterioration in chargeability and the appearance of white spots on the image. Cadmium sulfide photoreceptors are stable in humid environments and do not exhibit friendly sensitivity, and zinc oxide photoreceptors require the sensitizing effect of sensitizing dyes such as rose bengal. The sensitizing dye suffers from charging deterioration due to corona charging and photobleaching due to exposure light, so it has the disadvantage that it cannot provide stable images over a long period of time.

On the other hand, various organic photoconductive polymers including polyvinylcarbazole have been proposed, but these polymers are superior in terms of film formability and lightness compared to the aforementioned inorganic photoconductive materials. However, it has been difficult to put them into practical use to date, and inorganic light has not yet achieved sufficient film-forming properties. This is because it is inferior to conductive materials.

Hydrazone compounds disclosed in U.S. Pat. No. 4,150,987, etc., triarylpyrazoline compounds disclosed in U.S. Pat. No. 3,837,851, etc. S% Kaisho 5
Low-molecular organic photoconductors such as 9-styrylanthracene compounds described in JP-A-1-94828 and JP-A-51-94829 have been proposed. By appropriately selecting the binder used, such low-molecular-weight organic photoconductors can overcome the drawbacks of poor film formability that have been a problem in the field of organic photoconductive polymers. It cannot be said that the sensitivity is sufficient.

For these reasons, a laminated structure in which the photosensitive layer is functionally separated into a charge generation layer and a charge transport layer has been proposed in recent years. An electrophotographic photoreceptor having this laminated structure as a photosensitive layer can now be improved in terms of sensitivity to visible light, charge retention power, surface strength, etc.

Such an electrophotographic photoreceptor is disclosed in US Pat. No. 3,837, for example.
It is disclosed in the specification No. 851, the specification No. 171882, etc.

However, electrophotographic photoreceptors using conventional low-molecular organic photoconductors in the charge transport layer do not always have sufficient sensitivity and characteristics, and when repeatedly charged and exposed, bright areas There are some points that need to be greatly improved, such as fluctuations in potential and dark potential.

Problems to be Solved by the Invention It is an object of the present invention to provide an electrophotographic photoreceptor which eliminates the above-mentioned drawbacks or disadvantages.

Another object of the invention is to provide a new organic photoconductor.

Another object of the present invention is to provide a novel charge transport material in a photosensitive layer of a laminated type in which the charge generation layer and the charge transport layer are functionally separated.

Means for Solving the Problems and Effects The present invention is achieved by an electrophotographic photoreceptor having a skin containing a compound represented by the following general formula.

General formula However, in formula 1, "fbR2 is methyl, ethyl, propyl,
Alkyl groups such as butyl; aralkyl groups such as benzyl and phenethyl; aryl groups such as phenyl and naphthyl; , an aralkyl group, and an aralkyl group may be substituted with an alkyl group such as methyl, ethyl, propyl, or butyl, an alkoxy group such as methoxy, ethoxy, or propoxy, or a halogen atom such as PA, bromine, or iodine. good.

R5 represents an alkyl group or aralkyl group that may have the same substituent as R1%R2 above, or represents a naphthyl group or anthryl group, and the naphthyl group or anthryl group is substituted with an alkyl group, an alkoxy group, or a halogen atom. Will it be done?
alkyl-, phenyl- or aralkyl-substituted amino groups,
A which may be substituted with a cyano group or a nitro group
r1 represents an arylene group such as phenylene or naphthylene, and the arylene group is substituted with the same alkyl group, aralkyl group, alkoxy group, or halomene atom as R1 and R2, or substituted with an alkyl-, aryl-, or aralkyl-substituted amino group. may have been done.

Mr2 represents an aryl group such as phenyl, 7-tyl, or a heteroaromatic group such as pyridyl or quinolyl. The groups pyrrolidino and pi may be substituted with a 5- to 6-membered cyclic amino group such as ricino, an aryloxy group such as phenyloxy, an arylthio group such as phenylthio, or a halogen atom.

Representative examples of the compounds represented by the above general formula are listed below.

Compound example S-17 Sun-28 Next, a synthesis example of the above compound will be shown.

Synthesis Example s-1 Synthesis stirring system, cooling tube with calcium chloride tube, thermometer,
DMF120m in a flask with a gas inlet set!
= 290 - of benzene was weighed out, and 6.62 of sodium hydride (50% mineral oil) was added while flowing nitrogen gas.

Next, 4-acetyl-N,N-diethylaniline 35.2
t and 47.2 t of diethyl-(2,4-dimethylbenzyl)phosphonate were added in this order, and the mixture was stirred at room temperature for 9 hours.

Bubbles are generated and the temperature of the liquid gradually rises, so it is cooled with water.
The temperature was controlled at 0°C.

After the generation of bubbles ended, the mixture was left stirring for 30 minutes.

Thereafter, the temperature was gradually raised and after reaching the reflux temperature, reflux was continued for an additional 3 hours. A large amount of pale yellow precipitate was formed during reflux. Cool to room temperature and serve.

Add 1Lt of water, separate the oil layer, and remove the water layer with 300ml of benzene.
/ was extracted three times in total. First, the fixed oil layer and benzene extract were separated, washed with water, and dried. After drying, concentrate the liquid and add ethanol to recrystallize it. Furthermore, it was religated using MKK-ethanol thread and purified to obtain the target El-1 compound. Yield*sq, at (yield 73%) Elemental analysis value CHN Theoretical value 85.95 927 4.77 Measured value
85.88 9.32 4.80 Other compounds are similarly easily synthesized by condensing a given ketone with a diethylarylmethylphosphonate derivative in the presence of sodium hydride. Note that under the above conditions, the contamination of the cis isomer is extremely small.

In a preferred embodiment of the present invention, a compound represented by the above general formula can be used as a charge transport material in an electrophotographic photoreceptor in which the photosensitive layer is functionally separated into a charge generation layer and a charge transport layer.

The charge transport layer according to the present invention is preferably formed by applying a solution prepared by dissolving the compound represented by the above general formula and a binder in an appropriate solvent and drying the solution. Binders used here include 1, such as polyester, folysulfone, polyamide, acrylic resin, acrylonitrile resin, methacrylic resin, vinyl chloride resin, acetic acid beer resin, phenol resin, epoxy resin, polyester, alkyd resin% polycarbonate, polyurethane. Alternatively, a copolymer resin containing two or more of the repeating units of these resins, such as a styrene-butadiene copolymer.

Examples include styrene-acrylonitrile copolymer and styrene-maleic acid copolymer. IL In addition to such insulating polymers, organic photoconductive polymers such as polyvinylcarbazole, polyvinylanthracene and polyvirpyrene can also be used.

The blending ratio □ of this binder and the compound of the general formula is:
100 parts by weight of a binder Compounds of the general formula t-10 to 5
00 weight is preferable.

The charge transport layer is electrically connected to the underlying charge generation layer, and has the function of receiving and taking charge carriers injected from the charge generation layer in the presence of an electric field and transporting these charge carriers to the surface. have. At this time, this charge transport layer.

It may be laminated on top of the charge generation layer or under it. However, it is desirable that the charge transport layer is laminated on the charge generation layer. Since this charge transport layer has a limit in its ability to transport charge carriers, it cannot be made thicker than necessary. In general,
It is 5 to 30μ, with a preferred range of 8 to 20μ.

The organic solvent used when forming such a charge transport layer is
The binder varies depending on the type of binder used, and it is preferable to select one that does not dissolve the charge generation layer or underlying subbing layer. Specific organic solvents include methanol and ethanol.

Alcohols such as Impropatool, ketones such as acetone, methyl ethyl ketone, cyclohexanone,
N,N-dimethylformamide.

Amides such as N,N-dimethylacetamide.

Sulfoxides such as dimethyl sulfoxide, ethers such as tetrahydrofuran, dioxane, and ethylene glycol 7-methyl ether.

Esters such as methyl acetate and ethyl acetate, chloroform, methylene chloride, dichloroethylene.

Aliphatic halogenated hydrocarbons such as carbon tetrachloride and trichloroethylene, or benzene, toluene, xylene,
Aromatics such as ligroin, monochlorobenzene, dichlorobenzene, etc. can be used.

Coating methods include dip coating, spray coating, spinner coating, bead coating,
All coating methods such as Mayer-Per coating method, blade coating method, roller coating method, and curtain coating method can be used. For drying, it is preferable to dry to the touch at room temperature and then heat dry. Heat drying can be carried out at a temperature of 50 to 200°C for a period of time ranging from 5 minutes to 2 hours, either stationary or under ventilation.

The charge transport layer of the present invention can contain various additives. As such additives.

diphenyl, diphenyl chloride, 0-terphenyl, p-
Terphenyl, cyphthylphthalate.

dimethyl glycol phthalate, dioctyl phthalate, triphenyl phosphoric acid, methylnaphthalene, benzophenone, chlorinated paraffin, dilaurylthiopropione)
, 3,5-dinitrosa')fktR, and various fluorocarbons.

The charge generation layer used in the present invention includes selenium, selenium-tellurium, pyrylium, thiopyrylium, azulenium dyes,
Phthalocyanine 71% pigment, anthanthrone pigment, dibenzpyrenequinone pigment, pyranthrone pigment, trisazo pigment, disazo pigment, azo pigment, indigo pigment, quinacridone thread pigment, thiacyanine, asymmetric quinocyanine,
A vapor-deposited layer or a resin-dispersed layer with separate holes selected from charge-generating substances such as quinocyanine or amorphous silicon described in JP-A-54-145645 can be used.

Examples of the charge generating substance used in the electrophotographic photoreceptor of the present invention include the following inorganic compounds and organic compounds.

Charge generating substance; 1 (amorphous silicon 121 selenium-tellurium (3) selenium-arsenic (4) cadmium sulfide 02H5C2H5 proverb methine squaric acid dyeing [Co., Ltd.] indigo dye (C, engineering, flat 7 a 000) 1
) Thioindigo dye (C, engineering, A78800) Shun β-
Type steel phthalocyanine @ 4 The charge generation layer can be formed by dispersing the above-mentioned charge generation substance in a suitable binder, coating it on the substrate, and forming a vapor deposited film using a vacuum evaporation apparatus. You can get it by doing The binder that can be used when forming the charge generation layer by coating can be selected from a wide variety of insulating resins, including poly-N-vinylcal J<sol.

One can choose from organic photoconductor polymers such as polyvinylanthracene and polyvinylpyrene. Preferably % polyvinyl butyral, polyarylate (condensation polymer of bisphenol A and phthalic acid, etc.), polycarbonate, polyester, phenoxy resin, polyvinyl acetate, acrylic resin, polyacrylamide resin, polyamide, polyvinylpyridine, cellulose resin, urethane resin , epoxy resin, casein, polyvinyl alcohol, polyvinylpyrrolidone, and other insulating resins. The resin contained in the charge generation layer is suitably 80% by weight or less, preferably 40% by weight or less. Examples of organic solvents used during coating include alcohols such as methanol, ethanol, and impropatul, ketones such as acetone, methyl ethyl ketone, and cyclohexanone, N,N-dimethylformamyl', N,N-dimethylacetamide, etc. amides, sulfoxides such as dimethyl sulfoxide, ethers such as tetrahydrofuran, dioxane, ethylene glycol methyl ether, esters such as methyl acetate, ethyl acetate, chloroform, methylene chloride, dichloroethylene.

Aliphatic halogenated hydrocarbons such as carbon tetrachloride and trichloroethylene, or benzene, toluene, xylene,
Aromatic compounds such as licroin, monochlorobenzene, dichlorobenzene, etc. can be used.

Coating methods include dip coating, spray coating, spinner coating, bead coating,
This can be carried out using a coating method such as a Mayer coating method, a blade coating method, a roller coating method, or a curtain coating method.

Round the charge generating layer to obtain sufficient absorbance.

Contain as much of the organic photoconductor as possible.

In order to shorten the range of the generated charge carriers,
Thin film layer 1, for example, 5 or less pupils, preferably Q, 01+=
It is preferable to form a thin film layer having a thickness of p=$=w~1←-medium-. This means that most of the incident light is absorbed by the charge generation layer, producing many charge carriers.
This is due to the fact that it is necessary to inject the generated charge carriers into the charge transport layer without being deactivated by recombination or trapping.

A photosensitive layer having such a laminated structure of a charge generation layer and a charge transport layer is provided on a substrate having a conductive layer. Substrates with conductivity include those in which the substrate itself is electrically conductive.
For example, aluminum, aluminum alloy, copper, zinc, stainless steel.

vanadium, molybdenum, chromium, titanium, nickel,
Indium, gold, platinum, etc. can be used, and in addition, aluminum, aluminum alloy, indium oxide,
Plastics having ytN formed by coating tin oxide, indium oxide-tin oxide alloy, etc. by vacuum evaporation method (for example).

Polyethylene, polypropylene, poly331. vinyl,
Polyethylene terephthalate, acrylic resin, polyfluoroethylene, etc.), Shizuku! Use a substrate made of plastic coated with particles (e.g., carbon black, 4S particles, etc.) together with a suitable binder, a substrate made of plastic or paper impregnated with conductive particles, or a plastic with conductivity or d IJ mother. I can do it.

A subbing layer having barrier and adhesive functions can also be provided between the conductive layer and the photosensitive layer. The subbing layer is casein,
Polyvinyl alcohol, nitrocellulose, ethylene-
Acrylic acid copolymer, polyamide (nylon 6, nylon 66°, nylon 610, copolymerized nylon, alkoxymethylated nylon, etc.), polyurethane, gelatin,
It can be formed from aluminum oxide, etc.

The thickness of the subbing layer is 0.1 to 5μ, preferably 0.5 to 3μ.
is appropriate.

When a conductive layer, a charge generation layer, and a charge transport layer are laminated in this order and a photosensitive member is used, the compound has hole transport properties, so the surface of the charge transport layer must be negatively charged, and when exposed to light after charging, In the exposed area, holes generated in the charge generation layer are injected into the charge transport layer, and then reach the surface to neutralize the negative charges, causing attenuation of the surface potential and creating electrostatic contrast with the unexposed area. When printing, it is necessary to use a positively charged toner, contrary to the case where an electron transport material is used.

In another embodiment of the invention, the aforementioned disazo-displaying pyrylium dyes, thiapyrylium dyes, selenapyrylium dyes, benzopyrylium dyes.

Photoconductive pigments and dyes such as benzothiapyryllium dyes, naphthopyryllium dyes, and naphthothiapyrylium dyes can also be used as sensitizers.

In another embodiment, a eutectic complex of a pyrylium dye and an electrically insulating polymer having an alkylidene diarylene moiety, such as disclosed in US Pat. No. 3,684,502, can be used as a gold sensitizer. This eutectic complex is composed of 1 e.g. - halogenated hydrocarbon solvents (e.g. Eva,
Dichloromethane, chloroform, carbon tetrachloride 3,1.1-
Dichloroethane, 1,2-dichloroethane, 1.1
．． 2-) dichloroethane, chlorobenzene, fromobenzene, 1,2-dichlorobenzene) and then add a non-external solvent (e.g. hexane, octane, decane, 2,2,4-trimethylbenzene, ligroin) to this. The electrophotographic photoreceptor in this example includes styrene-butadiene fubolymer, silicone resin, vinyl resin, vinylidene chloride-7-acrylonitrile copolymer, styrene-acrylonitrile copolymer, Acetate-containing vinyl fluoride polymer, polyvinyl butyral, polymethyl methacrylate, poly-N-butyl methacrylate, polyesters, and cellulose esters can be contained as a binder.

The electrophotographic photoreceptor of the present invention can be used not only in electrophotographic copying machines but also in laser printers.

It can also be widely used in electrophotographic applications such as C'RT printers and electrophotographic plate making systems.

According to the present invention, it is possible to provide a highly sensitive electrophotographic photoreceptor, and it has the advantage that the variation in bright area potential and dark area potential at 9 o'clock when charging and exposure are repeated is small.

Hereinafter, the present invention will be explained according to examples.

Example 1 β-type copper phthalocyanine (trade name L) manufactured by Toyo Ink Manufacturing ■
1on (11Bie NCB TONer) k water,
After sequentially refluxing in ethanol and benzene, it was purified by filtration to obtain 9 pigments 7t + DuPont's "Product Name: Polyester Adhesive 49,000 (solid content 20%) J 14".
f+) 35 t of toluene and 65 fQ of dioxane were mixed and dispersed in a ball mill for 6 hours to prepare a working solution. This coating solution was applied onto an aluminum sheet until the dry film thickness was 0.
．． Apply it with a Mayer bar so that it becomes 5μ to generate a charge J'
dk created friend.

Next, i! The above-mentioned exemplified compound s-6y as a cargo transporting compound
7T and polycarbonate resin (trade name "Panlite-1300J" manufactured by Konjin Kasei) and 7F were stirred and dissolved in a mixed solvent of 551 tetrahydrofuran and 35t of chlorobenzene, and a solution was prepared on the charge generation layer of the gold tip. To,
Apply with Meyer Par to a dry film thickness of 11μ,
An electrophotographic photoreceptor with two photosensitive layers was created.

The nine electrophotographic photoreceptors thus prepared were statically corona charged at 15 KV using an electrostatic copying paper tester Model-8P-428 manufactured by Kawaguchi Electric.

After being held in a dark place for 1 second, it was exposed to light at an illuminance of 5 Lug to examine the charging characteristics.

The charging characteristics are as follows: 1 surface potential (Vo) and the amount of light exposure required to attenuate the potential (V,) when dark decayed for 1 second (
E) tl-measured.

Furthermore, in order to measure the fluctuations in bright area potential and dark area potential during repeated use, the photosensitive drum cylinder prepared in this example was pasted on the photosensitive drum cylinder of the Canon NP-15oz PPC copier. I made 5ooo copies with the same machine, and the initial and 5ooo copies.

Fluctuations in bright area potential (VL) and dark area potential (V'n) after copying were measured.

Comparative sample 1 was also prepared in exactly the same manner using a stilbene compound having the following structural formula in place of the exemplified compound.
Measure the skin in the same way. The results are shown below.

Table 1 In each of Examples 2 to 1, Exemplified Compound S'' was substituted for Exemplified Compound S-6 as the charge transport compound used in Example 1.
-1, B-2* S-4s S-7% S-8-8-1
0, 5-12, 5-13, 8-14%B-16, 5-1
7, 5-21.

5-24, 8-26.8-! An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that the pigment of Example (5) was used as the charge generating material.

The electrophotographic properties of each photoreceptor were measured in the same manner as in Example 1. The results are shown below.

Example 17 4-(4-dimethylaminophenyl)-2,6-cyphenylthiapyrylium hachlorate 3t and the above exemplary compound (S-20)? 5 f t-J IJ ester (Polyester Adhesive 49000: manufactured by DuPont) toluene (50)-dioxane (50) solution 100
and dispersed in a ball mill for 6 hours. This dispersion was coated onto an aluminum sheet using a Mayer parr so that the film thickness after drying was 15 μm.

Example 1 The electrophotographic properties of the sympathizer produced in this way
It was measured in the same manner as. The results are shown below.

VO: -600V vl: -585v 11:17: 2.5 mm x, sec Initial VD: -700V VL: -70V VN after soooo sheet durability: -6551 VL knee 105V Example 18 Ammonia aqueous solution of casein on an aluminum plate (Casein 1
1f of 129.28% ammonia water, 222ml of water) was applied using a Mayer bar and dried to form an adhesive layer with a thickness of 1 μm.

Next, a disazo pigment 5f having the following structure.

Butyral resin (degree of butyralization: 63 mol) 2tk polytanol 95IIIgVC @ After being dispersed with a liquid solution, it was coated on the adhesive layer to form a charge generation layer having a dry film thickness of 0.4μ.

Next, the above-mentioned s-5 compound t-5f and poly-4,4
'-Dioxydiphenyl-2,2-propane carbonate (viscosity average molecular weight 30,000) 5f was dissolved in 150 mg of dichloromethane and applied onto the liquid-specific gold charge generation layer, dried, and a charge transport Me shadow having a film thickness of 11 μm was formed. Create an electrophotographic photoreceptor by

The electrophotographic properties of the good electrophotographic photoreceptor prepared in this manner were measured in the same manner as in Example 1.

The results are shown below.

VO: -620V Vl: -610V g14: 3.1 tux, sec Initial VD knee 730V v1 knee aov soooo sheet durability VD: -6657 vL: -115V Example 19 0.2M thick molybdenum with cleaned surface Board (board)
was fixed at a predetermined position in a glow discharge deposition tank. Next, the tank was completely evacuated to a vacuum level of approximately 5×10 −6 torr.

After that, the input voltage of the heater is increased to stabilize the molybdenum substrate temperature at 150℃.90 After that, hydrogen gas and silane gas (15% of the hydrogen gas) are introduced into the tank, and the gas flow rate and the steamed main pulp are changed. ! # Adjust to 0.5 tor
stabilized at r. Next, 5 MHz high-frequency power was applied to the induction coil to generate a glow discharge inside the coil in the tank, resulting in an input power of 30 W. In the above case, an amorphous silicon film was grown on the substrate and the same conditions were maintained until the film thickness reached 2μ, then the glow discharge was stopped and the hole was turned off.Then, the heating heater and high frequency power were turned off, and the substrate temperature was raised to 100℃. After waiting for the hydrogen gas and silane gas to flow out of the pulp, the chamber was closed, and the temperature inside the chamber was once lowered to below t-1Q-5 torr, after which the pressure was returned to atmospheric pressure and the substrate was taken out. Next, a charge transport layer was formed on this amorphous silicon layer in exactly the same manner as in Example 1 except that Exemplary Compound 5-27k was used as a charge transport compound.The thus obtained sympathizer was placed in a charging exposure experimental apparatus. It was corona charged at -6 KV and immediately irradiated with a light image. The light image is illuminated through a transparent test chart using a tungsten lamp light source.

Immediately thereafter, a highly charged developer (containing toner and carrier) was cascaded onto the surface of the photoreceptor to obtain a good toner image on the surface of the photoreceptor.

Example 20 4-(4-dimethylaminophenyl)-2,6-cyphenylthiapyrylium perchlorate 3t and poly(4,
4'-isopropylidene diphenylene carbonate)s
After sufficiently dissolving in 200Mt of r@dichloromethane, 10Od of toluene! Addition.

A eutectic complex was precipitated. After separating this precipitate by t-F, dichloromethane was added to redissolve it, and then this solution was added with n-
Add hexane to IQGdk to obtain a precipitate of eutectic complex.

This eutectic complex was added to a methanol solution containing 5tt and 2ft of polyvinyl butyral and dispersed in a ball mill for 6 hours. This dispersion was applied onto an aluminum plate having a casein layer using a Mayer bar so that the film thickness after drying was L4 to form a charge generation layer.

Next, Exemplified Compound 8-3 t-
A cover layer of a charge transport layer was formed in the same manner as in Example 1 except that the coating layer was used.

The electrophotographic properties of the photoreceptor thus prepared were measured in the same manner as in Example 1. The results are shown below.

vQ ” -615V Vl: -6oov ” ” AD tu;c, aec Initial Vn knee 7oov VL knee B□v WD after 5000 times endurance: -6a□v VX=” -115V Example 21 Common used in Example 20 A product similar to the crystal complex 52 and a tetrahydrofuran solution 150 of the exemplified 5-28 compound@5tk polyester (Polyester Adhesip 49000, manufactured by DuPont) were added to the mixture and thoroughly mixed and stirred.

This solution was applied onto an aluminum sheet using a Mayer par so that the film thickness after drying would be 15 μm.

The electrophotographic properties of this photoreceptor were measured in the same manner as in Example 1. The results are shown below: vQ: -600V vl + -590V x%: 2. B & x, sea Initial VD: -7107 VL knee 757 VD after soooo sheet durability: -6207 VL: -115V Patented Field Canon Co., Ltd.

Claims (1)

[Claims] (1) An electrophotographic photoreceptor characterized by having a layer containing a compound represented by the following general formula. General formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ However, in the formula, R_1 and R_2 represent an alkyl group, an aralkyl group, an aryl group, or a residue that forms a cyclic amino group together with the N atom, and the alkyl group, aralkyl group, and The aryl group may be substituted with an alkyl group, an alkoxy group, or a halogen atom. R_3 represents an alkyl group or aralkyl group that may have the same substituents as R_1 and R_2 above, or represents a naphthyl group or anthryl group, and the naphthyl group and anthryl group are an alkyl group, an alkoxy group, a halogen atom,
It may be substituted with a substituted amino group, cyano group or nitro group. Ar_1 represents an arylene group, and the arylene group is R_
1. May be substituted with the same alkyl group, aralkyl group, alkoxy group, halogen atom, or substituted amino group as in R_2. Ar_2 represents an aryl group or a heteroaromatic group, and the aryl group or heteroaromatic group is an alkyl group, an aralkyl group, a substituted amino group, a 5- to 6-membered cyclic amino group, an aryloxy group, an arylthio group, or a halogen atom. May be replaced.