JPS62103653A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To form an electrophotographic sensitive body capable of stably maintaining hysteresis condition of potential of the photosensitive body without causing increase of residual potential even if the photosensitive material is used repeatedly by incorporating a phthalocyanine compd. in the carrier generating material and a specified styryl compd. in the carrier transporting material. CONSTITUTION:The carrier generating material contains a metal phthalocyanine compd. and/or a nonmetal phthalocyanine compd., and the carrier transporting material contains a styryl compd. expressed by the formula [I]. In the formula [I], R<1> is a substituted or unsubstituted aryl group; R<2> is H atom, etc.; R<3> is substituted or unsubstituted aryl group. A specific example of the carrier transporting material expressed by the formula [I] is given by the formula [I-1].

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electrophotographic photoreceptor, which exhibits high sensitivity to light with wavelengths longer than visible light and semiconductor laser light used in printers, copiers, etc. This relates to photoreceptors.

BACKGROUND OF THE INVENTION Conventionally, electrophotographic photoreceptors having high sensitivity to visible light have been widely used in copying machines, printers, and the like.

As such electrophotographic photoreceptors, inorganic photoreceptors provided with a photosensitive layer mainly composed of an inorganic photoconductive substance such as selenium, zinc oxide, or cadmium sulfide are widely used. However, such inorganic photoreceptors do not necessarily satisfy the characteristics such as photosensitivity, thermal stability, moisture resistance, and durability required of electrophotographic photoreceptors for copying machines and the like.

For example, since selenium crystallizes due to heat or fingerprint stains when touched, the above-mentioned characteristics as an electrophotographic photoreceptor tend to deteriorate. Further, electrophotographic photoreceptors using cadmium sulfide have poor resistance to wet earthworks and durability, and electrophotographic photoreceptors using zinc oxide have problems in durability. Also, selenium,
Electrophotographic photoreceptors made of cadmium sulfide also have the drawback of being severely restricted in manufacturing and handling.

In order to improve these problems with inorganic photoconductive materials, attempts have been made to use various organic photoconductive materials in the photosensitive layer of electrophotographic photoreceptors, and active research and development has been conducted in recent years. ing. For example, Japanese Patent Publication No. 50-10496 describes an organic photoreceptor having a photosensitive layer containing poly-N-vinylcarbazole and 2,4,7-dolinitro-9-fluorenone. However, this photoreceptor also has insufficient sensitivity and durability. Therefore, a functionally separated electrophotographic photoreceptor has been developed in which the photosensitive layer is divided into two layers, a carrier generation layer and a carrier transport layer are separately configured, and each layer contains a carrier generation substance and a carrier transport substance. This is because the carrier generation function and the carrier transport function can be assigned to different substances, and the substances that exhibit each function can be selected from a wide range of materials. It is expected that organic photoreceptors with high sensitivity and durability can be obtained relatively easily.

Many substances have been proposed as carrier-generating substances effective for the carrier-generating layer of such functionally separated electrophotographic photoreceptors. An example of using an inorganic substance is amorphous selenium, as described in Japanese Patent Publication No. 43-16198. This carrier generation layer containing amorphous selenium is used in combination with a carrier transport layer containing an organic carrier transport material. However, as described above, this carrier generation layer made of amorphous selenium has the problem that it is crystallized by heat or the like and its properties deteriorate. Furthermore, examples of using an organic substance as the carrier generating substance include organic dyes and organic pigments. For example, as having a photosensitive layer containing a bisazo compound, JP-A No. 47-37543,
JP-A-55-22834, JP-A-54-7963
This method is already known from Publication No. 2, Japanese Unexamined Patent Publication No. 116040/1980, and the like.

However, although these known bisazo compounds exhibit relatively good sensitivity in the short or medium wavelength range, they have low sensitivity in the long wavelength range, making them difficult to use in laser printers that use semiconductor laser light sources, which are expected to have high reliability. It was difficult to use.

Gallium-aluminum-arsenic (Ga-Al.As) light-emitting elements, which are currently widely used as semiconductor lasers, have an oscillation wavelength of approximately 750 nm or more. In order to obtain an electrophotographic photoreceptor with high sensitivity to such long wavelength light, a number of studies have been carried out in the past. A method of adding an aggravating agent to make the wavelength longer has been considered, but as mentioned above, Se and CdS do not have sufficient environmental resistance against temperature, humidity, etc. In addition, many known organic photoconductive As mentioned above, the sensitivity of the material is usually 7.
The sensitivity is limited to the visible light region of 00 nm or less, and there are few materials that have sufficient sensitivity to wavelengths longer than this.

Among these, phthalocyanine compounds, which are one of the organic photoconductive materials, are known to have a photophobic region extended to longer wavelength regions than other compounds. Various crystalline forms of phthalocyanine compounds have been discovered in the process of converting α-type phthalocyanine compounds into stable crystalline β-type phthalocyanine compounds. Examples of these phthalocyanine compounds exhibiting photoconductivity include those described in Japanese Patent Publication No. 49-433
X-type metal-free phthalocyanine compound described in Publication No. 8 and JP-A-58-182639, JP-A-60-1.91
Examples include τ, τ゛, η, η” type metal-free phthalocyanine compounds described in Publication No. 51.

By the way, in the case of -a photoreceptors, a carrier transporting substance that is effective against a certain carrier-generating substance is not necessarily effective against other carrier-generating substances; It cannot be said that a carrier-generating substance that is effective against other carrier-transporting substances is also effective against other carrier-transporting substances. After all, in order to be used in an electrophotographic photoreceptor, a suitable combination of carrier-generating and carrier-transporting substances is required, and if this combination is inappropriate, the sensitivity of the electrophotographic photoreceptor will be affected. Not only does this reduce the discharge efficiency, especially at low electric fields, the so-called residual potential increases, and in the worst case, if this electrophotographic photoreceptor is used in a copying machine, for example, it may be used repeatedly. Charges accumulate each time the toner is used, and as a result, toner may also adhere to non-image areas, causing background smudges on the copy or making it impossible to obtain a clear copy image.

Although there are some rules regarding suitable combinations of carrier-generating substances and carrier-transporting substances, they do not apply to all substances, and in fact, there are currently no rules that apply to suitable combinations of carrier-generating substances and carrier-transporting substances. Experimental selection of suitable combinations has been carried out, and it is unclear which combination should be selected as the most suitable carrier transport substance when using the above phthalocyanine compounds or other phthalocyanine compounds as carrier generating substances. It wasn't known.

Problems to be Solved by the Invention As mentioned above, it has been known that phthalocyanine compounds have high sensitivity to light in the long wavelength range.
In order to use this as an electrophotographic photoreceptor, it is not known what to use as a carrier transporting substance, and it has been desired to improve this problem.

Therefore, the first object of the present invention is to prevent the residual potential from increasing even during repeated use by using a carrier transporting material that is optimal for using a phthalocyanine compound as a carrier generating material. An object of the present invention is to provide an electrophotographic photoreceptor whose potential history state is stably maintained.

A second object of the present invention is to be stable to heat and light;
The present invention provides an electrophotographic photoreceptor having high sensitivity to long wavelength light and semiconductor laser light.

Means for Solving the Problems In order to solve the above problems, the present invention provides an electrophotographic photoreceptor having a photosensitive layer containing a carrier-generating substance and a carrier-transporting substance, in which the carrier-generating substance is a metal phthalocyanine compound and a carrier-transporting substance. / or contains a metal-free phthalocyanine compound, and the carrier transport substance has the following general formula [
The present invention provides an electrophotographic photoreceptor characterized by containing a styryl compound represented by [I].

(However, in this general formula, R1 is a substituted or unsubstituted aryl group, R2 is a hydrogen atom, a halogen atom, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkyl group, an alkoxy group, an amino group, a substituted amino group, a hydroxyl group, R3 represents a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group.) Next, the present invention will be described in detail.

The phthalocyanine compound used in the present invention can be a metal-free phthalocyanine compound, a metal phthalocyanine compound, or a combination of both. can be used, and these phthalocyanine compounds include, for example, α, β
, T, τ, τ′, η, η′, χ type metal phthalocyanine compounds and ε type copper phthalocyanine compounds,
Among these, metal-free phthalocyanine compounds are characterized by excellent sensitivity and charging stability. Table 1 shows the characteristic values of some of these metal-free phthalocyanines.

Table 1 These metal-free phthalocyanine compounds are
Publication No. 9-4338, Japanese Unexamined Patent Publication No. 1988-19154,
It is described in detail in Japanese Unexamined Patent Publication No. 182639/1983.

In addition, as shown in Figure 1, CuKα 1.541 people
The Bragg angle with respect to the line (error 2e±0.2 degrees) is 7.
7.9.3.16.9.17.6.22.4.28.8
It has an X-ray diffraction spectrum with a main peak at a Bragg angle of 1 to a peak at a Bragg angle of 9.3.
The intensity ratio of the peak at Bragg angle 22 to the peak at Bragg angle 9.3 is 0.8 to 1.0.
．． The intensity ratio of each peak of 4 and 28.8 is 0.4
As shown in Figure 2, its infrared absorption spectrum is 720 ±'l between 700 and 760 cm-'.
4 absorption bands with the strongest cm-1, 1320±23-
Those having a characteristic absorption at 1.3288±3 cm-' and having a visible and near-infrared absorption spectrum maximum of 770 nm or more and less than 790 nm, as shown in FIG. 3, can be preferably used. This metal-free phthalocyanine compound ^
Its crystal form is stable, and it cannot be exposed to organic solvents such as acetone, tetrahydrofuran, toluene, ethyl acetate, or 1,2-dichloroethane, left at 200°C for 50 hours, or subjected to mechanical strain such as milling. It is preferable because it is difficult to transform its crystal form even when force is applied, and it has excellent potential stability for repeated use of the photoreceptor.This is detailed in the specification of the patent application dated August 26, 1985. Are listed.

Metal phthalocyanine compound and/or used in the present invention
Or carrier generators that can be used in combination with metal-free phthalocyanine compounds include azo pigments, anthraquinone pigments,
Examples include perylene pigments, polycyclic quinone pigments, and methine squaric acid head.

Specific examples of these will be described later.

In the present invention, at least one of the carrier transport substances represented by the above general formulas (1) and (If) is used in combination with the above metal phthalocyanine compound and/or metal-free phthalocyanine compound, and specific examples thereof include the following: Examples include:

(Margin below this page) (I-3) C%m -ノ1cm) -Yo2 2ψ 9 --V
-NOOCR.

(+-32) QC)I.

Filled with the metal phthalocyanine compound and/or.

(■ (■ ←L [However, in this general formula, Arl+ ArL and Arconi, respectively, are substituted or unsubstituted R cyclic aromatic N groups, R・lR'lR' and R1: respectively, electron-withdrawing At least one of R1 to R4 is an electron-withdrawing group such as a cyano group, and A' (X is a hydroxy group, -NH3Ot-R1; however, 1. RI and R'' are %RII" is a hydrogen atom or a substituted or unsubstituted alkyl group, respectively, and Y is a hydrogen atom, a halogen atom, or a substituted or unsubstituted alkyl group. , an alkoxy group, a carboxyl group, a sulfo group, a substituted or red-substituted carbamoyl group, or a substituted 3- or unsubstituted sulf-7 moyl group (however, when nl is 2 or more, they may be different groups from each other) , ), Z is a group of atoms necessary to constitute a heterocyclic aromatic ring of IA or an unsubstituted carbocyclic aromatic ring, or a substituted or zhu!, tA, Ra is a hydrogen atom, a substituted or an unsubstituted amino group, a substituted or unsubstituted carbamo-fl group, a carboxyl group or an ester group thereof, 8' is a ItA substitution or an unsubstituted aryl group, rl is an integer of 1 or 2, , M number from 0 to 4.)
In addition, examples of the polycyclic compound include the compound of the following general formula (II).

General formula (III) (In this -g formula, Xo represents a halogen atom, a nitro group, a cyano group, an acyl group, or a carboxyl group, and n is 0 to 4
represents an integer. ) Specific examples are as follows.

(I[[-1) (Iff-2) (II[-3) (I[[-4) (III-5) (n+ -6) (I[1-7) (ffr--8) Present invention In order to construct the photosensitive layer of the electrophotographic photoreceptor, a carrier-generating substance and a carrier-transporting substance are combined to form a so-called functionally separated photosensitive layer of a laminated type or a dispersed type. In this case, it is usually as shown in FIGS. 4 to 9.

That is, in the layer structure shown in FIG. 4, a carrier generation layer 2 containing a metal phthalocyanine compound and/or a metal-free phthalocyanine compound is formed on a conductive support 1, and a carrier transport layer containing the above-mentioned carrier transport substance is formed on this carrier generation layer 2. 3 is laminated to form a photosensitive layer 4. In FIG. 5, a photosensitive layer 4 is formed by reversing these carrier generation layer 2 and carrier transport layer 3, and the layers in FIG. The composition is the fifth
An intermediate layer 5 is formed between the photosensitive layer 4 and the conductive support 1 having the layer structure shown in the figure.
In FIG. 7, an intermediate layer 5 is provided between the photosensitive layer 4' having the layer structure shown in FIG. 6 and the conductive support 1 to prevent injection of free electrons into the conductive support 1. This is what I did. The layer configurations shown in FIGS. 5 and 7 are suitably used as a positively charging photoreceptor, and in this case, the carrier generation layer 2 may contain a carrier transport substance together with a carrier generation substance. The layer structure shown in FIG. 8 forms a photosensitive layer 4' containing a carrier-generating substance 6 containing a metal phthalocyanine compound and/or a metal-free phthalocyanine compound and a carrier transporting substance 7 combined therewith. The layer structure is such that the above-mentioned intermediate layer 5 is provided between the photosensitive layer 4'' and the conductive support 1.

In the case of forming a photosensitive layer having a two-layer structure, carrier generation N2 can be provided by the following method.

(a) A method of applying a solution in which a carrier-generating substance is dissolved in a suitable solvent, or a solution in which a binder is added and mixed and dissolved.

(b) A method in which a carrier-generating substance is made into fine particles in a dispersion medium using a ball mill, a homomixer, etc., and a binder is added as necessary to mix and disperse the obtained dispersion, and the resulting dispersion is applied.

Dispersing the particles under the action of ultrasound in these methods allows for homogeneous dispersion.

Solvents or dispersion media used to form the carrier generation layer include n-butylamine, diethylamine, ethylenediamine, isopropanolamine, triethanolamine, triethylenediamine, N,N-dimethylformamide, acetone, methylethylketone, cyclohexanone, and benzene. , toluene, xylene, chloroform, l,2-dichloromethane, dichloromethane, tetrahydrofuran, dioxane, methanol, ethanol, isopropanol, ethyl acetate, butyl acetate, dimethyl sulfoxide, and the like.

When a binder is used to form a carrier generation layer or a carrier transport layer, any binder can be used, but in particular, a polymer that is hydrophobic, has a high dielectric constant, and has the ability to form an electrically insulating film. Polymers are preferred. Examples of such polymers include, but are not limited to, the following:

a) Polycarbonate b) Polyester C) Methacrylic resin d) Acrylic resin e) Polyvinyl chloride f) Polyvinylidene chloride g) Polystyrene h) Polyvinyl acetate i) Styrene-butadiene copolymer j) Vinylidene chloride-acrylonitrile copolymer k) Vinyl chloride-vinyl acetate copolymer l) Vinyl chloride-vinyl acetate-maleic anhydride copolymer m) Silicone resin n) Silicone-alkyd resin 0) Phenol-formaldehyde resin p) Styrene-
Alkyd resin q) Poly-N-vinylcarbazole r) Polyvinyl butyral These binders can be used alone or in a mixture of two or more. The ratio of the carrier generating substance to the binder is 10 to 600% by weight, preferably 50 to 400% by weight, and the proportion of the carrier transporting substance is 10 to 50% by weight.
It is preferable to set it to 0% by weight.

The thickness of the carrier generation layer 2 formed in this way is 0.
．． It is preferably 0.01 to 20 μm, more preferably 0.05 to 5 μm. The thickness of the carrier transport layer is 2 to 100 μm, preferably 5 to 30 μm.

When the photosensitive layer is formed by dispersing the carrier-generating substance, the carrier-generating substance has a thickness of 2 μm or less,
It is preferable that the powder has an average particle size of 1 μm or less. In other words, if the particle size is too large, dispersion in the layer will be poor, and some of the particles will protrude from the surface, resulting in poor surface smoothness. In some cases, electrical discharge may occur at the protruding parts of the particles, or Toner particles tend to adhere and a toner filming phenomenon occurs easily. For carrier generating substances that are sensitive to long wavelength light (~700 nm), the surface charge is neutralized by the generation of thermally excited carriers in the carrier generating substance, and if the particle size of the carrier generating substance is large, this It seems to have a large neutralizing effect.

Further, the photosensitive layer may contain one or more electron-accepting substances for the purpose of improving sensitivity, reducing residual potential, and reducing fatigue during repeated use. Examples of electron-accepting substances that can be used here include succinic anhydride, maleic anhydride, dibromosuccinic anhydride, phthalic anhydride, tetrachlorophthalic anhydride, tetrabromo phthalic anhydride, 3-nitro phthalic anhydride, 4- Nitrophthalic anhydride, pyromellitic anhydride, mellitic anhydride, tetracyanoethylene, tetracyanoquinodimethane, o-dinitrobenzene, l-dinitrobenzene, 1.3.5-
) dinitrobenzene, varanitrobenzonitrile, picryl chloride, quinone chlorimide, chloranil,
Brumanil, dichlorodicyanobarabenzoquinone, anthraquinone, dinitroanthraquinone, 9-fluorenylidene [dicyanomethylenemalonodinitrile], polynitro-9-fluorenylidene [dicyanomethylenemalonodinitrile], picric acid, O-nitrobenzoic acid, p
-Nitrobenzoic acid, 3.5-dinitrobenzoic acid, pentafluorobenzoic acid, 5-nitrosalcylic acid, 3.5-dinitrosalicylic acid, phthalic acid, mellitic acid, and other compounds with high electron affinity can be mentioned. Also,
The addition ratio of the electron-accepting substance is carrier-generating substance:electron-accepting substance in a weight ratio of 100:0.01 to 200, preferably 100:0.1 to 100.

The support l on which the photosensitive layer is to be provided is a metal plate, a metal drum, or a conductive thin layer made of a conductive polymer, a conductive compound such as indium oxide, or a metal such as aluminum, palladium, or gold, which is coated or vapor-deposited. , a material provided on a substrate such as paper or plastic film by means such as lamination or the like is used. The intermediate layer, which functions as an adhesive layer or a barrier layer, may be made of a polymer as described above as the binder resin, an organic polymer material such as polyvinyl alcohol, ethyl cellulose, or carboxymethyl cellulose, or aluminum oxide. things are used.

Effects of the Invention As explained above, in the present invention, when a metal phthalocyanine compound and/or a metal-free phthalocyanine compound is used as a carrier generating substance, the styryl compound described above is used as a carrier transporting substance, so that it can be used as a photoreceptor without high performance. In addition to being able to hold it, even when used repeatedly, the potential history is small, and the angry light body frame property is maintained stably. Further, it is possible to provide an electrophotographic photoreceptor that takes advantage of the heat and light stability characteristics of the phthalocyanine compound. Due to these, it is possible to provide an electrophotographic photoreceptor that is unprecedentedly superior to long-wavelength light and laser light.

EXAMPLES Examples will be described below, but prior to this, examples of synthesis of metal-free phthalocyanine compounds having the properties shown in FIGS. 1 to 3 and τ-type metal-free phthalocyanine compounds will be shown.

Synthesis Example 1 50 g of lithium phthalocyanine is added to 600 ml of concentrated sulfuric acid with sufficient stirring at 0°C. The mixture is then stirred at this temperature for 2 hours. The resulting solution was then filtered through a coarse sintered glass funnel and
Pour slowly into a bottle of ice and water while stirring. After standing for several hours, the mixture is filtered and the resulting mass is washed with water until neutral. The mass is then finally washed several times with methanol and dried in air. This dried powder is extracted with acetone in a 24 hour continuous extractor and dried in air to give a blue powder.

In the above the precipitation is repeated to ensure a salt residue for lithium. 30.5 g of blue powder was thus obtained. The X-ray diffraction pattern of the obtained product was consistent with the X-ray diffraction pattern of an α-type phthalocyanine compound described in previously published materials.

30 g of the metal-free α-phthalocyanine compound obtained in this manner was half-grooved with a 13/16 inch diameter pole to give an internal volume of 900 ml! The mixture was placed in a porcelain ball mill and milled at about 80 rpm for 164 hours. Thereafter, 200 ml of a residual solvent such as tetrahydrofuran or 1,2-dichloroethane was added to the ball mill, and the mixture was milled again for 24 hours. The organic solvent was removed from the dispersion after milling and the dispersion was dried to obtain 28.2 g of metal-free phthalocyanine compound A.

Synthesis Example 2 An α-type metal-free phthalocyanine compound (Monolite Fast Pull GS manufactured by ICI) was extracted and purified three times with heated dimethyl formaldehyde. Through this operation, the purified product was transferred to the β form. Next, a portion of this β-type metal-free phthalocyanine compound was dissolved in concentrated sulfuric acid, and this solution was poured into ice water to cause reprecipitation, thereby transforming it into the α-type.

After washing this reprecipitate with aqueous ammonia, methanol, etc.
It was dried at 0°C. Next, the α-type metal-free phthalocyanine compound purified as described above was placed in a sand mill together with a grinding aid and a dispersant, and kneaded at a temperature of 100±20° C. for 15 to 25 hours. After confirming that the crystal form has changed to the τ type by this operation, take it out from the container, thoroughly remove the grinding aid and dispersant with water and methanol, etc., and dry it to form a τ type with a clear bluish tinge. Blue crystals of metal phthalocyanine were obtained.

Example 1 1.0 g of the metal-free phthalocyanine compound obtained in Synthesis Example I and polymethyl methacrylate (
Elvacite-2010 (manufactured by DuPont) 2.0 g was added to 1,2-dichloroethane Loom 1 and dispersed by ultrasonic dispersion. The film thickness after drying this dispersion is 0.
．． A carrier generation layer was formed by coating and drying to a thickness of 5 μm.

Furthermore, on top of this, 12.4 g of the carrier transport material of Example 1-9 shown in Table 2 and polycarbonate (Panlite L
-1250, manufactured by Kijin Kasei Co., Ltd. H6, 5 g dissolved in 1,2-dichloroethane Loom 1 was coated and dried to form a carrier transport layer, and then dried to form a carrier transport layer. I got it.

Examples 2 to 6 Examples 2 to 6 were used instead of the substances in Table 2 in Example 1.
Electrophotographic photoreceptors of Examples 2 to 6 were obtained in the same manner except that the substances listed in the columns corresponding to each of G were used.

Comparative Examples 1 and 2 Comparative Examples 1 and 2 were used as carrier transport substances in Example 1.
Electrophotographic photoreceptors of Comparative Examples 1 and 2 were obtained in the same manner except that the substances listed in the columns corresponding to were used.

Comparative Examples 3 to 4 Comparative Examples 3 to 4 were carried out in the same manner except that the τ-type phthalocyanine compound of Synthesis Example 2 was used in Example 1, and the carrier transport substance described in each column of Comparative Example 3.4 was used. An electrophotographic photoreceptor was obtained.

Evaluation Test The electrophotographic properties of each of the electrophotographic photoreceptors obtained as described above were investigated using an "Electrometer 5P428 Model" (manufactured by Kawaguchi Denki Seisaku Shin). In other words, it is necessary to attenuate the acceptance potential VA (V) when the photoreceptor surface is charged for 6 seconds at a charging voltage of -6 KV and the potential V (initial potential) after dark decay for 5 seconds to 172. Exposure amount E1/2 (Lux・sec) (using tungsten light source) and dark decay rate (VAV+)/V+ X100
% and 10 (Lux-sec) residual potential V after exposure,
(V) was measured.

Next, in a similar measurement system, a tungsten light source was used as the light source, and the wavelength 78
Half-decreased exposure amount El/2 (λ=
780) (erg/cn) was measured. The above acceptance potential VA (V) and residual potential were also measured after 10,000 copies.

Table 3 shows these results. △VA, ΔVR in the table
is the value obtained by subtracting the characteristic value after 10,000 copies from each initial characteristic value.

(Eno shell below #white)

[Brief explanation of drawings]

Figure 1 shows metal-free phthalocyanine compound 1 used in the present invention.
The X-ray diffraction diagram of A, Figure 2 is its infrared absorption spectrum, Figure 3 is the near-infrared absorption spectrum of this phthalocyanine, Figures 4, 5, 6, 7, and 8. FIG. 9 shows a specific example of the layer structure of the electrophotographic photoreceptor of the present invention. In the figure, 1 is a tetraelectric support, 2 is a carrier generation layer, 3 is a carrier transport layer, 4.4'', 41 is a photosensitive layer, 5 is an intermediate layer,
6 is a carrier-generating substance, and 7 is a carrier-transporting substance. October 31, 1985 Figure 1 Figure 3 Reverse 1 person, 4 prongs, 1 vector Figure 4 Figure 7 Figure 8 Figure 9 Procedural amendment damage (addressed to self) December 02, 1985 Michibe Uga, Commissioner of the Japan Patent Office1, Indication of the case, Patent Application No. 242885 of 19852, Name of the invention Electrophotographic photoreceptor 3, Relationship with the case of the person who corrects 7iii Patent applicant Nishi, Shinjuku-ku, Tokyo Shinjuku 1-26-2 (127) Konishiroku Photo Industry Co., Ltd. Representative Keio Ide 4, Agent ■105 s, i Date of positive order Voluntary

Claims (1)

[Claims] (1) In an electrophotographic photoreceptor having a photosensitive layer containing a carrier-generating substance and a carrier-transporting substance, the carrier-generating substance contains a metal phthalocyanine compound and/or a metal-free phthalocyanine compound, and the carrier-transporting substance has the following general formula [ An electrophotographic photoreceptor comprising a styryl compound represented by I]. General formula [I] ▲ Numerical formulas, chemical formulas, tables, etc.▼ (However, in this general formula, R^1 is a substituted or unsubstituted aryl group, and R^2 is a hydrogen atom, a halogen atom, a substituted or unsubstituted (R^3 represents a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group.)