JPH0453308B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to an electrophotographic photoreceptor, and more particularly to a novel electrophotographic photoreceptor having a photosensitive layer containing an organic photoconductive compound as a main component. (Prior Art) Conventionally, an electrophotographic photoreceptor (hereinafter sometimes simply referred to as a photoreceptor) has a photosensitive layer mainly composed of an inorganic photoconductive compound such as selenium, zinc oxide, cadmium sulfide, or silicon. Inorganic photoreceptors have been widely used. However, these are not necessarily satisfactory in terms of sensitivity, thermal stability, moisture resistance, durability, etc. For example, when selenium crystallizes, its properties as a photoreceptor deteriorate, making it difficult to manufacture.Also, selenium crystallizes due to heat, fingerprints, etc., and its performance as a photoreceptor deteriorates. In addition, cadmium sulfide has problems with moisture resistance and durability, and zinc oxide has problems with durability, etc. In order to overcome these drawbacks of inorganic photoreceptors, research and development have been actively conducted in recent years on organic photoreceptors having photosensitive layers containing various organic photoconductive compounds as main components. For example, in Japanese Patent Publication No. 50-10496, poly-N-vinylcarbazole and 2,4,7-
There is a description of an organic photoreceptor having a photosensitive layer containing trinitro-9-fluorenone. However, this photoreceptor is not necessarily satisfactory in sensitivity and durability. In order to improve these drawbacks, attempts have been made to develop organic photoreceptors with higher performance by assigning the carrier generation function and the carrier transport function to different substances. Many studies have been conducted on such so-called function-separated type photoreceptors because each material can be selected from a wide range and a photoreceptor having arbitrary performance can be produced relatively easily. As a result, various azo compounds have been developed and put into practical use as carrier generating substances. On the other hand, regarding carrier transport substances, for example,
No. 94829, JP-A-52-72231, JP-A-53-27033
A wide variety of substances have been proposed, as disclosed in Japanese Patent Application Laid-Open No. 55-52063, Japanese Patent Application Laid-Open No. 58-65440, etc. [Problems to be Solved by the Invention] Some electrophotographic photoreceptors made using carrier transport materials such as those described above exhibit relatively excellent electrophotographic performance, but the light or electrical load It does not fully satisfy practical requirements because it has low durability and causes unstable performance and deterioration during repeated use. However, it does not fully satisfy practical requirements. It has been desired to develop a carrier transport material that exhibits such performance. Furthermore, in recent years, Ar laser has been used as a light source for photoreceptors.
Gas lasers such as He-Ne lasers and semiconductor lasers are beginning to be used. A characteristic of these lasers is that they can be turned on and off in chronological order, making them particularly promising light sources for copiers with image processing functions, such as intelligent copiers, and printers for computer output. Among these, semiconductor lasers are attracting attention because their nature does not require electrical signal/optical signal conversion elements such as acoustic engineering elements, and they can be made smaller and lighter. However, this semiconductor laser has a low output compared to a gas laser,
In addition, since the oscillation wavelength is long (approximately 780 nm or more), the spectral sensitivity of conventional photoreceptors is too high on the short wavelength side, making it difficult to apply to devices that use semiconductor lasers as light sources, and carrier transport. New improvements in materials were also required. The present invention has been carried out in order to solve these problems and provide an electrophotographic photoreceptor with extremely high durability. [Means for solving the problem] The above problem can be solved by applying the following general formula [] to the conductive support.
The problem was solved by an electrophotographic derivative characterized by containing a triphenylamine derivative represented by: General formula [] In the formula, R ₁ , R ₂ , R ₃ and R ₄ represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a hydroxyl group, a dialkylamino group, a diarylamino group, a dialkylamino group, a cyano group or a nitro group.
When R ₁ to _{R 4} are an alkyl group or an alkoxy group, the number of carbon atoms is preferably 1 to 18, particularly preferably 1 to 8. R ₅ is a hydrogen atom, a halogen atom, an alkyl group,
It represents a cyano group, an aromatic carbocyclic group, or an aromatic heterocyclic group, and when it is an alkyl group, it preferably has 1 to 4 carbon atoms. Examples of aromatic carbocyclic groups include phenyl group and naphthyl group, and preferred aromatic heterocyclic groups include thienyl group, furyl group, and pyridyl group. W represents a substituted or unsubstituted chain carbon atom group or a substituted or unsubstituted chain heteroatom group forming a nonconjugated condensed ring with the benzene ring to which R ₁ and R ₂ are bonded. Particularly preferable examples of the condensed ring formed by the W atomic group include the following.

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[Formula] That is, in the present invention, the general formula []
By using the triphenylamine derivative represented by as a photoconductive substance of an electrophotographic photoreceptor,
Further, by utilizing only the excellent carrier transport ability of the triphenylamine derivative of the present invention, it can be used as a carrier transport material in a so-called functionally separated electrophotographic photoreceptor in which carrier generation and transport are performed using separate substances. , has excellent film properties, excellent electrophotographic properties such as charge retention, sensitivity, and residual potential, and exhibits low fatigue deterioration even after repeated use, and exhibits stable properties against heat and light. An electrophotographic photoreceptor can be produced. The triphenylamine derivatives used in the present invention can be used alone or in combination of two or more of the triphenylamine derivatives represented by the general formula [], and can also be used in combination with other photoconductive substances. May be used. Specific examples of the triphenylamine derivatives represented by the above general formula [] that are effective in the present invention include those having the following structural formula, but this does not limit the triphenylamine derivatives according to the present invention. It is not something that will be done. Exemplary Compounds Compounds represented by the general formula []
Compound represented by a] In the table below, the bonding positions of R ₁ and R ₂ are represented by the general formula [
a], and the bonding positions of R ₃ and R ₄ are o, as seen from the bonding position with N of the benzene ring.
It is shown with m and p.

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[Table] Next, a specific synthesis example of the triphenylamine derivative of the present invention will be described. Synthesis example (synthesis of exemplified compound B-13) Pour 200ml of dehydrated ether into a 500ml container.
- Add 4.5 g (approximately 0.0105 mol) of a hexane solution of butyltium. Under a nitrogen atmosphere, 5.56 g (0.01 mol) of triphenylamine-4-methyltriphenylphosphonium chloride was added, and after stirring for 0.5 hours, 5,7-dimethyl-1-tetralone was added.
A solution of 1.74 g (0.01 mol) in 60 ml of dehydrated ether is added dropwise. After reacting at room temperature for 48 hours, the precipitate is removed by filtration, the filtrate is concentrated, and the target product is fractionated using silica gel column chromatography. Yield: 2.1g (52%) The compound of the present invention as described above has almost no photosensitivity to visible light by itself, but by applying a certain sensitization method, it can be given photoconductivity to visible light. It is possible to form a photoreceptor by itself. The first method is to add an organic dye and perform spectral sensitization (dye sensitization). The second method is to sensitize by forming a charge transfer complex. Examples of dyes used for spectral sensitization include the following. (1) Triphenylmethane pigments such as methyl violet, crystal violet, and malachite green (2) Xanthene pigments such as erythrosine and rose bengal (3) Thiazine pigments such as methyl blue and methylene green (4) Capri Oxazine dyes such as Blue and Meldora Blue (5) Cyanine dyes such as thiacyanine and oxacyanine (6) Styryl dyes such as P-dimethylaminostyrylquinoline (7) Pyrylium salt, thiapyrylium salt, benzobyrylium salt, etc. pyrylium salt dye (8) 3,3'-dicarbazolylmethane dye Electron-accepting substances that can form a charge transfer complex with the compound of the present invention include 2,4,7-trinitrofluorenone, Lewis acids such as 2,4,5,7-tetranitrofluorenone, chloranil, and tetracyanoquinodimethane are used. However, the compound of the present invention is most preferably utilized only by its carrier transport ability, and is combined with other organic dyes, pigments, or inorganic photoconductors or other carrier-generating substances having carrier-generating ability to form a functionally separated photoreceptor. Effects can be obtained. The dyes listed in (1) to (8) above are useful as carrier generating substances, but the following may also be mentioned. (1) Azo dyes such as monoazo dyes, disazo dyes, and trisazo dyes (2) Perylene dyes such as perylenic anhydride and perylenic acid imide (3) Indigo dyes such as indigo, thioindigo, etc. (4) Anthraquinone, Polycyclic quinones such as bilenequinone and frapanthrones (5) Quinacridone dyes (6) Bisbenzimidazole dyes (7) Induthrone dyes (8) Squarylium dyes (9) Phthalocyanines such as metal phthalocyanines and metal-free phthalocyanines -based pigments (10) Selenium, selenium alloys (11) Inorganic photoconductors such as CdS, CdSe, amorphous silicon, etc. (12) Eutectic complexes formed from pyrylium salt dyes, thiapyrylium salt dyes, and polycarbonate These various carrier generation Among the substances, particularly preferable carrier-generating substances in view of their properties as photoreceptors for semiconductor laser printers include azo compounds shown in the following general formulas [] to []. However, A in the general formulas [] to [] represents a group of the general formula []. General formula [] In the formula, Z is

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[Formula] represents R ₅₁ , R ₅₂ , R ₅₃ , R ₅₄ , R 55 , R ₆₁ , R ₆₂ , R ₆₃ , R ₆₄ , R ₆₅ and _{R 66}
represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a hydroxyl group, a nitro group, a cyano group, a dialkylamino group, a diphenylamino group, an amide group, an acyl group, a carboxyl group, or an alkoxycarbonyl group. General formula [] [In the formula, Q ₁ and Q ₂ represent a hydrogen atom, a halogen atom, an alkyl group, or an alkoxyl group. ] General formula [ ] [In the formula, Q ₃ , Q ₄ and Q ₅ represent a hydrogen atom, a halogen atom, an alkyl group or an alkoxyl group. ] General formula [ ] [In the formula, Q ₆ and Q ₇ represent a hydrogen atom, a halogen atom, an alkyl group, or an alkoxyl group. ] General formula [ ] General formula [] General formula [] General formula [] General formula [] [In the formula, Q ₈ and Q ₉ represent a hydrogen atom, a halogen atom, an alkyl group, a hydroxyl group, or an alkoxyl group. ] General formula [XI] [In the formula, Q ₁₀ and Q ₁₁ represent a hydrogen atom, a halogen atom, an alkyl group, a hydroxyl group, or an alkoxyl group. ] General formula [XII] [In the formula, Q ₁₂ and Q ₁₃ represent a hydrogen atom, a halogen atom, an alkyl group, a hydroxyl group, or an alkoxyl group. ] General formula [ ] [In the formula, Q ₁₄ and Q ₁₅ represent a hydrogen atom, a halogen atom, an alkyl group, a hydroxyl group, or an alkoxyl group, and ₁ and ₂ represent a halogen atom (F, Cl, Br or I). ] General formula [ ] [In the formula, Q ₁₆ and Q ₁₇ represent a hydrogen atom, a halogen atom, an alkyl group, a hydroxyl group, or an alkoxyl group, Q ₁₈ represents a hydrogen atom, a cyano group, an alkyl group, or a phenyl group, and Q ₁₉ to Q ₂₃ represent Represents a hydrogen atom, a halogen atom, a cyano group, an alkyl group, an alkoxyl group, a hydroxyl group, an amino acid, a dialkylamino acid, a diphenylamino group, or an acyl group. ] General formula [ ] [In the formula, Q ₂₄ and Q ₂₅ represent a hydrogen atom, a halogen atom, an alkyl group, a hydroxyl group, or an alkoxyl group, and Q ₂₆ and Q ₂₇ may have a hydrogen atom, an alkyl group, an alkoxyl group, or a substituent. Represents a good vinyl group, acyl group, alkoxycarbonyl group, halogen atom or cyano group. ] General formula [ ] [In the formula, Q ₂₈ and Q ₂₉ represent a hydrogen atom, a halogen atom, an alkyl group, or an alkoxyl group, and Q ₃₀ and Q ₃₁ represent a hydrogen atom, a cyano group, a halogen atom, an alkyl group, or a phenyl group. ] Specific examples of the above carrier-generating substances are as follows.

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[Table] Also, visible light photoreceptor (for example, as a light source,
When producing a halogen lamp, xenon lamp, tungsten lamp, LED, He-Ne laser, or other visible laser, etc., particularly preferred carrier generating materials are shown below. [
] Examples include azo compounds. However, in the following general formulas [] to [], A' represents the general formula [']. General formula [′] [In the formula, Z′ is

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[Formula], R ₇₁ to R ₇₅ and R ₈₁ to R ₈₇ are hydrogen atoms, halogen atoms, alkyl groups, alkoxy groups, hydroxyl groups, nitro groups, cyano groups, dialkylamino groups, diphenylamino groups, amide groups, acyl group, carboxyl group, or alkoxycarbonyl group. General formula [] [In the formula, Q ₃₂ and Q ₃₃ represent a hydrogen atom, a halogen atom, an alkyl group, a hydroxyl group, or an alkoxyl group. ] General formula [ ] [In the formula, Q ₃₄ and Q ₃₅ represent a hydrogen atom, a halogen atom, an alkyl group or an alkoxyl group. ] General formula [ ] [In the formula, Q ₃₆ and Q ₃₇ represent a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group. ] General formula [ ] General formula [XI] General formula [XII] General formula [] [In the formula, Q ₃₈ is a halogen atom, an alkyl group,
Alkoxyl group, dialkylamino group, hydroxyl group,
Alternatively, it represents a cyano group, and p represents an integer of 0 to 5. ] General formula [ ] [In the formula, Q ₃₉ and Q ₄₀ are a hydrogen atom, a halogen atom, an alkyl group, a cinnamyl group, an acyl group,
Represents an ester group or a phenyl group which may have a substituent. ] General formula [ ] [In the formula, Q ₄₁ and Q ₄₂ represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, or a hydroxyl group. ] General formula [ ] [In the formula, Q ₄₃ and Q ₄₄ represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, or a hydroxyl group. ] General formula [ ] General formula [] [In the formula, Q ₄₅ and Q ₄₆ represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, or a hydroxyl group. ] General formula [ ] [In the formula, Q ₄₇ and Q ₄₈ represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, or a hydroxyl group. ] General formula [ ] [In the formula, Q ₄₉ and Q ₅₀ represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, or a hydroxyl group. ]

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[Table] Since the cyclized diphenylamine derivative used in the present invention does not have the ability to form a coating by itself, a photosensitive layer is formed by combining various binders. Any binder can be used here, but it is hydrophobic and has a high dielectric constant.
It is preferable to use an electrically insulating film-forming polymer. Examples of such high molecular weight polymers include, but are not limited to, the following. (1) Polycarbonate (2) Polyester (3) Methacrylic resin (4) Acrylic resin (5) Polyvinyl chloride (6) Polyvinylidene chloride (7) Polystyrene (8) Polyvinyl acetate (9) Styrenic copolymer resin (e.g. styrene -butadiene copolymer, styrene methyl methacrylate copolymer) (10) Acrylonitrile copolymer resin (e.g. vinylidene chloride-acrylonitrile copolymer, etc.) (11) Vinyl chloride-vinyl acetate copolymer (12) Vinyl chloride- Vinyl acetate-maleic anhydride copolymer (13) Silicone resin (14) Silicone-alkyd resin (15) Phenol resin (e.g. phenol-formaldehyde resin, m-cresol-formaldehyde resin, etc.) (16) Styrene-alkyd resin (17) ) Poly-N-vinylcarbazole (18) Polyvinyl butyral (19) Polyvinyl formal These binders can be used alone or in a mixture of two or more. As shown in FIGS. 1 and 2, the photoreceptor of the present invention has a carrier-generating layer 2 containing a carrier-generating substance as a main component and a triphenylamine derivative of the present invention as a carrier-transporting material on a dielectric support 1. A photosensitive layer 4 consisting of a laminate with a carrier transport layer 3 containing as a main component is provided. As shown in FIGS. 3 and 4, this photosensitive layer 4 may be provided on the dielectric support 1 via an intermediate layer 5. When the photosensitive layer 4 has a two-layer structure in this manner, an electrophotographic photoreceptor having the most excellent electrophotographic properties can be obtained. Further, in the present invention, as shown in FIGS. 5 and 6, a photosensitive layer 4 formed by dispersing a carrier generating substance 7 in the form of fine particles in a layer 6 mainly composed of the carrier transporting substance is attached to a conductive support. It may be provided directly on 1 or via an intermediate layer 5. Further, preferable results can also be obtained by adding a sensitizing dye or a Lewis acid to a carrier transporting material and forming a single photosensitive layer 4 as shown in FIGS. 5 and 6, without using a carrier generating material. When the photosensitive layer 4 has a two-layer structure, whether the carrier generation layer 2 or the carrier transport layer 3 should be the upper layer is determined depending on whether the charging polarity is positive or negative. That is, when forming a negatively charged photosensitive layer, it is advantageous to use the carrier transport layer 3 as an upper layer, because the triphenylamine derivative in the carrier transport layer 3 has a high transport ability for holes. This is because it is a substance. Further, the carrier generation layer 2, dielectric support 1, or carrier transport layer 3 constituting the two-layered photosensitive layer 4 may be directly or optionally provided with an intermediate layer such as an adhesive layer or a barrier layer. It can be formed by a method. (1) Vacuum evaporation method (2) A method in which a solution of a carrier-generating substance dissolved in an appropriate solvent is applied. (3) 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 dispersion obtained by mixing and dispersing with a binder as necessary is applied. The carrier generation layer 2 thus formed preferably has a thickness of 0.01 to 5 microns, more preferably 0.05 to 3 microns. Further, the thickness of the carrier transport layer 3 can be changed as necessary, but it is usually preferably 5 to 30 microns. The composition ratio in this carrier transport layer 3 is preferably 0.8 to 10 parts by weight of the binder to 1 part by weight of the carrier transport substance containing the triphenylamine derivative of the present invention as a main component. When forming the photosensitive layer 4 in which a carrier-generating substance is dispersed, it is preferable to use a binder in an amount of 5 parts by weight or less per 1 part by weight of the carrier-generating substance. Further, when the carrier generation layer 2 is configured as a dispersed layer using a binder, it is preferable to use the binder in an amount of 5 parts by weight or less per 1 part by weight of the carrier generation substance. As the dielectric support 1 used in the construction of the electrophotographic photoreceptor of the present invention, the following are mainly used, but the dielectric support 1 is not limited thereto. 1 Metal plates such as aluminum plates and stainless steel plates. 2. A thin layer of metal such as aluminum, palladium, or gold provided on a support such as paper or plastic film by lamination or vapor deposition. 3 A layer of a dielectric compound such as a dielectric polymer, indium oxide, or tin oxide is provided on a support such as paper or plastic film by coating or vapor deposition. In addition to the polymer used as the binder, the intermediate layer 5 such as an adhesive layer or barrier layer may be made of an organic polymer material such as gelatin, casein, starch, polyvinyl alcohol, vinyl acetate, ethyl cellulose, carboxymethyl cellulose, or the like. Aluminum oxide or the like is used. The photoreceptor of the present invention has the above structure,
As is clear from the examples described later, it has excellent charging characteristics, sensitivity characteristics, and image forming characteristics. Hereinafter, the present invention will be specifically explained in Examples,
This does not limit the embodiments of the present invention. Example 1 Selenium was evaporated onto a conductive support consisting of a polyester film laminated with aluminum foil to form a carrier generating layer with a thickness of 0.5 microns. On top of that, 1.6 parts by weight of Exemplified Compound B-1 and 10 parts by weight of polycarbonate "Panlite L-1250" (manufactured by Teijin Chemicals) were dissolved in 90 parts by weight of 1,2-dichloroethane, and this solution was dried. A carrier transport layer was formed by coating to a final film thickness of 11 microns, and an electrophotographic photoreceptor of the present invention was prepared. The electrophotographic properties of this electrophotographic photoreceptor were measured dynamically using an electrostatic copying paper tester "SP-428 model" (manufactured by Kawaguchi Denki Seisakusho Co., Ltd.). That is, the surface of the photosensitive layer of the photoreceptor is charged with a -
The surface potential V _A when charged at 6 KV for 5 seconds is then irradiated with light from a tungsten lamp so that the illuminance on the photoreceptor surface is 35 lux, and the amount of exposure required to attenuate the surface potential V _A by half ( Half-decreased exposure amount) E1/2 (lux・sec) and 30lux・sec
Surface potential (residual potential) after irradiation with an exposure amount of
V _R was calculated for each. The same measurement was repeated 100 times. The results are shown in Table 1.

[Table] As is clear from this table, the electrophotographic photoreceptor of the present invention has sufficient charge retention ability, high sensitivity, low residual potential, and maintains good characteristics even after repeated use. It has excellent physical properties. Comparative Example 1 A comparative photoreceptor was prepared in the same manner as in Example 1, except that Compound T-1 below was used instead of Exemplary Compound B-1 as a carrier transport material. When this photoreceptor was measured in the same manner as in Example 1, the results shown in Table 2 were obtained.

[Table] As is clear from the above results, the comparative photoreceptor was significantly inferior in stability during repeated use compared to the photoreceptor of the present invention of Example 1. Examples 2 to 4 An electrophotographic photoreceptor of the present invention was produced in the same manner as in Example 1, except that Exemplified Compounds B-20, B-21, and B-2 were used instead of Exemplified Compound B-1 as a carrier generating substance. It was created. The initial characteristics of these photoreceptors were measured in the same manner as in Example 1, and the results shown in Table 3 were obtained.

[Table] Example 5 Vinyl chloride-vinyl acetate-maleic anhydride copolymer "Eslec MF-
10" (manufactured by Sekisui Chemical Co., Ltd.) with a thickness of 0.05 microns, and on top of that, 1 part by weight of dibromoanthrone "Monolite Red 2Y" (CI No. 59300, manufactured by ICI) and 30 parts by weight of 1,2-dichloroethane. In addition, 1.5 parts by weight of polycarbonate "Panlite L-1250" (manufactured by Teijin Kasei) was dissolved in the dispersion obtained by dispersing in a ball mill, and the thoroughly mixed coating solution was dried to a film thickness of 2 microns. A carrier generation layer was formed by applying the coating to form a carrier generation layer. On top of that, a solution of 5.6 parts by weight of Exemplary Compound B-1 and 10 parts by weight of polyester "Vylon 200" (manufactured by Toyobo Co., Ltd.) dissolved in 90 parts by weight of 1,2-dichloroethane was added to the film thickness after drying. A carrier transport layer was formed by coating to a thickness of 11 microns, and an electrophotographic photoreceptor of the present invention was prepared. Measurements were carried out on this photoreceptor in the same manner as in Example 1, and the results shown in Table 4 were obtained.

[Table] Comparative Example 2 A comparative photoreceptor was prepared in the same manner as in Example 5, except that Compound T-2 below was used instead of Exemplary Compound B-5 as a carrier transport material. When this comparative photoreceptor was measured in the same manner as in Example 1, the results shown in Table 5 were obtained.

[Table] As is clear from the above results, the comparative photoreceptor was significantly inferior in sensitivity and repeated stability compared to the compound of the present invention. Example 6 A 0.1 micron thick intermediate layer made of polyester "Vylon 200" (manufactured by Toyobo Co., Ltd.) was provided on a conductive support made of a polyester film laminated with aluminum foil. On top of that, a liquid containing 1 part by weight of an azo pigment represented by the following structural formula as a carrier generating substance dispersed in 60 parts by weight of 1,2-dichloroethane is added to a film with a film thickness of 0.3 after drying.
A carrier generation layer was formed by coating in a micron thickness. Furthermore, exemplified compound B-5,6 is added thereto.
Weight part and polycarbonate “Panlite L-
1250" (manufactured by Teijin Chemicals) in 90 parts by weight of 1,2-dichloroethane, the film thickness after drying was 15%.
A carrier transport layer was formed by coating in a micron thickness to produce an electrophotographic photoreceptor of the present invention. The initial characteristics of this photoreceptor were measured in the same manner as in Example 1.V _A =-910 _v , E1/2=
It was 4.2 lux·sec and V _R =O _v . In addition, this photoreceptor was used in an electrophotographic copying machine "U-
Bix2000R (manufactured by Konishiroku Photo Industry Co., Ltd.) and conducted a live-photography test, the resulting reproduced images were faithful to the original, had high contrast, excellent gradation, and were clear. Even after repeating this process 1000 times, a copy image as good as the initial one was obtained. Example 7 An electrophotographic photoreceptor of the present invention was prepared in the same manner as in Example 6 except that the following compound was used as a carrier generating substance. The initial characteristics of this photoreceptor are V _A = -880 _v , E1/2
= 4.3 lux・sec, V _R = O _v . This was installed in an electrophotographic copying machine "U-Bix2000R" (manufactured by Konishi Roku Photo Industry Co., Ltd.), and a photocopying test was conducted. Even after repeating 1000 times, a good copy image was obtained that was as good as the initial copy. Example 8 The triphenylamine derivative of the present patent also has particularly excellent performance as a carrier transport material for photoreceptors for semiconductor laser printers. actually,
Create a photoconductor for semiconductor laser as shown below,
Good results were obtained. Vinyl chloride-vinyl acetate-maleic anhydride copolymer "Eslec MF-10" (manufactured by Sekisui Chemical Co., Ltd.) was placed on an aluminum drum with an outer diameter of 10 cm as a conductive support.
An intermediate layer with a thickness of 0.05 μm is provided, and on top of this, 2 g of the compound G-151 is mixed in 110 ml of 1,2-dichloroethane, and the dispersion is dispersed in a ball mill for 24 hours. After drying, the film thickness is 0.1 μm. A carrier generation layer was formed by applying the coating to form a carrier generation layer. On this carrier generation layer, a solution of 6 g of Exemplified Compound B-24 and 10 g of the metal acrylic resin "Acrypet" (manufactured by Mitsubishi Rayon Co., Ltd.) dissolved in 70 ml of 1,2-dichloroethane was applied to a film thickness of 18 μm after drying. A carrier transport layer was formed by coating the electrophotographic photoreceptor of the present invention. The sensitivity of this photoreceptor to 790 nm semiconductor laser light was 420 voH·cm ² ·μW ⁻¹ ·sec ⁻¹ (light attenuation rate). A live photo test was carried out using an experimental machine equipped with a semiconductor laser (790 nm) that produced a laser light intensity of 0.85 mW on the surface of the photoreceptor of the present invention. After the surface of the photoreceptor was charged to -6 KV, it was exposed to laser light and reverse development was performed at a bias voltage of -250 V. A good image without fogging was obtained. Comparative Example 3 A comparative photoreceptor was obtained in the same manner as in Example 8 except that the following Exemplified Compound T-3 was used in place of Exemplified Compound B-24. The sensitivity of this photoreceptor to 790 nm semiconductor laser light was 110 voH·cm ² ·μW ⁻¹ ·sec ⁻¹ (light attenuation rate). Using this comparative photoreceptor, a photo-taking test using a semiconductor laser was conducted in the same manner as in Example 8, but there was a lot of fog and good images could not be obtained. A photoreceptor was created by combining the following carrier transport materials.
The conditions for producing the photoreceptor were all the same as in Example 8, except for the types of the two materials mentioned above. The sensitivity of each sample to 790 nm laser light was good as shown in the table.

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[Example 33-56]

A photoreceptor was prepared by replacing the carrier generating substance and carrier transporting substance B-5 of Example 6 with the carrier generating substance and carrier transporting substance shown in Table 7, respectively, and the same method as in Example 1 was used to prepare a photoreceptor for visible light. The photosensitivity E1/2 was measured and the results shown in Table 7 were obtained. As shown in the table, all photoreceptors using the carrier transport material according to the present invention exhibit high photosensitivity.

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〔Effect of the invention〕

According to the present invention, it is possible to obtain an excellent photoreceptor that has high sensitivity, extremely stable characteristics during repeated use, and has no toxicity problem.

[Brief explanation of drawings]

FIGS. 1 to 6 each represent a cross-sectional view showing an example of the mechanical structure of the electrophotographic photoreceptor of the present invention. 1... Conductive support, 2... Carrier generation layer,
3... Carrier transport layer, 4... Photosensitive layer, 5... Intermediate layer, 6... Layer containing a carrier transport substance, 7
...Carrier generating substance.

Claims (1)

[Scope of Claims] 1. An electrophotographic photoreceptor comprising a photosensitive layer containing a triphenylamine derivative represented by the following general formula [] on a conductive support. General formula [] In the formula, R ₁ , R ₂ , R ₃ , and R ₄ represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a hydroxyl group, a dialkylamino group, a diarylamino group, a dialkylamino group, a cyano group, or a nitro group, and R _Five
represents a hydrogen atom, a halogen atom, an alkyl group, a cyano group, an aromatic carbocyclic group, or an aromatic heterocyclic group, and W is a substituent that forms a non-conjugated condensed ring with the benzene ring to which R ₁ and R ₂ are bonded. Or it represents an unsubstituted chain carbon atomic group or a substituted or unsubstituted chain hetero atomic group. 2. The electrophotographic photoreceptor according to claim 1, wherein the photosensitive layer contains a carrier-generating substance and a carrier-transporting substance, and the carrier-transporting substance is a triphenylamine derivative represented by the general formula []. . 3. The electrophotographic photoreceptor according to claim 1 or 2, wherein the photosensitive layer is constituted by a laminate of a carrier generation layer containing a carrier generation substance and a carrier transport layer containing a carrier transport substance. .