JPH0934143A - Electrophotographic photoreceptor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electrophotographic photoreceptor having superior electric charge transferring ability and such characteristics of a photoreceptor as high sensitivity and high durability. SOLUTION: This electrophotographic photoreceptor has a photosensitive layer contg. an amine compd. represented by general formula I on the electrically conductive substrate. In the formula, Ar is an aryl which may have a substituent, Ar2 is phenylene which may have a substituent, naphthylene, biphenylene or anthrylene, R1 is H, a lower alkyl or a lower alkoxy, X is H, an alkyl which may have a substituent or an aryl which may have a substituent and Y is an aryl which may have a substituent or a group represented by general formula II [where R2 is H, a lower alkyl or a lower alkoxy, R3 is H, a halogen or a lower alkyl, Z is H or an aryl which may have a substituent and each of (m) and (n) is an integer of 0-4].

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electrophotographic photoreceptor having a photosensitive layer containing a specific amine compound.

[0002]

2. Description of the Related Art An electrophotographic method is generally a method in which the surface of a photoconductor made of a photoconductive material is charged in the dark, for example, by corona discharge, and then exposed to the light to selectively dissipate the charge in the exposed area. It is a kind of image forming method in which an electrostatic latent image is dispersed to obtain an electrostatic latent image, which is visualized with toner, and then transferred and fixed on paper or the like to obtain an image. As the photoconductor, an inorganic photoconductor containing an inorganic photoconductive compound such as selenium, zinc oxide, cadmium sulfide, or silicon as a main component, and a charge generating agent and a low-molecular weight or high-molecular weight charge transport agent in a binder resin There is an organic photoconductor using an organic compound dispersed in. Inorganic photoconductors have many advantages and have been widely used until now.For example, selenium is difficult to produce, its production cost is high, it is vulnerable to heat and mechanical shock, and it easily crystallizes, resulting in poor performance. Resulting in. Zinc oxide and cadmium sulfide have problems in moisture resistance and mechanical strength, and the dye added as a sensitizer is deteriorated by electrification and exposure, resulting in poor durability. Silicon is also difficult to manufacture and uses a highly irritating gas, so it is expensive and sensitive to humidity.

In recent years, organic photoreceptors using various organic compounds have been studied and widely used for the purpose of overcoming the drawbacks of these inorganic photoreceptors. Organic photoreceptors include a single-layer photoreceptor in which a charge generating agent and a charge transporting agent are dispersed in a binder resin, and a laminated photoreceptor in which a charge generating layer and a charge transporting layer are functionally separated. The function-separated type organic photoconductor has been extensively researched and widely used because of its wide choice of materials and the fact that a photoconductor having any desired performance can be produced relatively easily by combining them.

Examples of the charge generating agent include azo compounds,
Many organic compounds such as bisazo compounds, trisazo compounds, tetrakisazo compounds, thiapyrylium salts, squarylium salts, azurenium salts, cyanine dyes, perylene compounds, metal-free or metal phthalocyanine compounds, polycyclic quinone compounds, thioindigo compounds, or quinacridone compounds. Pigments and dyes have been proposed and put into practical use.

As the charge transfer agent, for example, Japanese Patent Publication No. 34-
Oxadiazole compounds described in JP-A-5466, JP-A-56
No. 123544, Oxazole Compound, Japanese Examined Patent Publication No. 5
JP-A 2-41880, Pyrazoline Compound, JP-B-55
-42380 gazette and Japanese Patent Publication No. 61-40104 gazette,
JP-B-62-35673, JP-B-63-3597
No. 6, hydrazone compound, Japanese Patent Publication No. 58-32372
Compounds disclosed in Japanese Patent Publication No. 63-18738, Japanese Patent Publication No. 63-19867, and Japanese Patent Publication No. 3-393.
No. 06 stilbene compound, JP-A-62-3025
For example, there is a butadiene compound disclosed in Japanese Patent No. Organic photoconductors using these charge-transporting materials have excellent properties and some have been put into practical use, but those that sufficiently satisfy the properties required for electrophotographic photoconductors have not yet been obtained. The current situation is not.

[0006]

The charge transfer agent used in the organic photoreceptor has not only the sensitivity and other characteristics as a photoreceptor, but also a chemical stability that withstands light, ozone, and electrical loads. Stability and durability are required so that the sensitivity does not decrease even after repeated use or long-term use. An object of the present invention is to provide an electrophotographic photoconductor that satisfies the photoconductor characteristics and has high sensitivity and high durability.

[0007]

According to the present invention, there is provided an electrophotographic photoreceptor having a photosensitive layer containing an amine compound represented by the following general formula (1).

[0008]

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[In the formula, Ar ₁ represents an aryl group which may have a substituent, and Ar ₂ represents a phenylene group, a naphthylene group, a biphenylene group or an anthrylene group which may have a substituent; ₁ represents a hydrogen atom, a lower alkyl group or a lower alkoxy group, X represents a hydrogen atom, an alkyl group which may have a substituent or an aryl group which may have a substituent, and Y represents a substituent. An aryl group which may be used or the following general formula (2)

[0010]

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(Wherein R ₂ represents a hydrogen atom, a lower alkyl group or a lower alkoxy group, R ₃ represents a hydrogen atom, a halogen atom or a lower alkyl group, Z represents a hydrogen atom or a substituent) Represents an aryl group, and m and n represent an integer of 0 to 4). In the present invention, the above-mentioned general formula (1) contained in the photosensitive layer is
The amine compounds represented by are novel compounds, and these compounds are formylation of the corresponding triarylamine compounds and modified Witti with the corresponding phosphonate ester.
It is synthesized by the g reaction. Formylation is Vilsmei
The general method is by the er reaction. For example, the following general formula (3)

[0012]

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[In the formula, Ar ₂ , R ₁ and Y have the same meanings as in the general formula (1). ] The triarylamine compound represented by the formula [4] is subjected to formylation with N, N-dimethylformaldehyde and phosphorus oxychloride.

[0014]

[Chemical 6]

[In the formula, Ar ₂ , R ₁ and Y have the same meanings as in the general formula (1). ] The aldehyde compound represented by this is obtained. Next, the following general formula (5) is added to this aldehyde compound.

[0016]

[Chemical 7]

[In the formula, Ar ₁ and X have the same meanings as in the general formula (1), and R ₄ represents a lower alkyl group. ] It reacts with the phosphonic acid ester represented by this, and the amine compound of this invention represented by the said General formula (1) is obtained. In the amine compound of the present invention represented by the general formula (1), the following general formula (6)

[0018]

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[In the formula, Ar ₁ , Ar ₂ , R ₁ , R ₂ , X and m have the same meanings as in the general formulas (1) and (2). ] The N-arylaniline compound represented by the following formula is used as a starting material to carry out the formylation reaction as described above, and the following general formula (7)

[0020]

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[Wherein Ar ₁ , Ar ₂ , R ₁ , R ₂ , X
And m have the same meanings as in the general formulas (1) and (2). ] The aldehyde compound represented by

[0022]

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[In the formula, R ₃ , R ₄ , Z and n have the same meanings as in the general formulas (2) and (5). ] In the general formula (1), Y is the following general formula (2)

[0024]

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[In the formula, R ₂ , R ₃ , Z, m and n have the same meanings as in the general formula (2). ] The amine compound of the present invention represented by the general formula (1) can be obtained.

The condensation reaction between the above-mentioned aldehyde compound and phosphonic acid is a reaction known as a modified Wittig reaction, and is preferably carried out in the presence of a basic catalyst. In this case, the basic catalyst is potassium hydroxide,
Sodium amide, sodium methylate, potassium-
t-Butoxide or the like is used. As the solvent, methyl alcohol, ethyl alcohol, t-butyl alcohol, toluene, tetrahydrofuran, dioxane, dimethyl sulfoxide, N, N-dimethylformamide and the like are used. The reaction temperature is usually room temperature to 100 ° C. The phosphonate represented by the general formula (5) or (8) used as a raw material in the present invention is
It can be easily synthesized by reacting a corresponding halogen compound and trialkyl phosphite directly or by heating in an organic solvent such as toluene, xylene or N, N-dimethylformamide.

In the general formula (1), when Ar ₁ is an aryl group having a substituent, the substituent is a lower alkyl group having 1 to 4 carbon atoms or a lower alkoxy group having 1 to 4 carbon atoms. , A cycloalkyl group having 5 to 6 carbon atoms, a benzyl group, a phenyl group or a halogen atom, and when the substituent is a lower alkyl group or a lower alkoxy group, a lower alkoxy group having 1 to 4 carbon atoms or a halogen atom. It may be further substituted with an atom, and when the substituent is a benzyl group or a phenyl group, it is further substituted with a lower alkyl group having 1 to 4 carbon atoms, a lower alkoxy group having 1 to 4 carbon atoms, or a halogen atom. May be. Examples of the aryl group of Ar ₁ include a phenyl group, a naphthyl group, a biphenylyl group, an anthryl group and a pyrenyl group.
Ar ₂ has a substituent, a phenylene group, a naphthylene group,
When it is a biphenylene group or an anthrylene group, as a substituent, a lower alkyl group having 1 to 4 carbon atoms and 1 carbon atom
To 4 lower alkoxy group or halogen atom, and when the substituent is a lower alkyl group or a lower alkoxy group, it may be further substituted with a lower alkoxy group having 1 to 4 carbon atoms or a halogen atom.

When X, Y or Z is an aryl group having a substituent, examples of the substituent include the same as the above-mentioned substituent which Ar ₁ can have. When X is an alkyl group having a substituent, the substituent is a lower alkoxy group having 1 to 4 carbon atoms and 5 to 5 carbon atoms.
6 cycloalkyl groups, halogen atoms and the like. Examples of the X, Y or Z aryl group include a phenyl group, a naphthyl group, a biphenylyl group, an anthryl group and a pyrenyl group.

Specific examples of the compound represented by the general formula (1) contained in the photosensitive layer according to the present invention include the following.

Compound No. (1)

[Chemical 12]

Compound No. (2)

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Compound No. (3)

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Compound No. (4)

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Compound No. (5)

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Compound No. (6)

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Compound No. (7)

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Compound No. (8)

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Compound No. (9)

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Compound No. (10)

[Chemical 21]

Compound No. (11)

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Compound No. (12)

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Compound No. (13)

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Compound No. (14)

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Compound No. (15)

[Chemical formula 26]

The electrophotographic photoreceptor of the present invention has a photosensitive layer containing one or more of the above amine compounds. There are various forms of the photosensitive layer, and any of them may be used as the photosensitive layer of the electrophotographic photosensitive member of the present invention. As a typical example, the photoreceptor is shown in FIGS.

The photosensitive member shown in FIG. 1 comprises a conductive support 1 and a photosensitive layer 2 comprising an amine compound, a sensitizing dye and a binder resin. The photoconductor of FIG. 2 is such that a photoconductive layer 21 in which a charge generating substance 4 is dispersed in a charge transport medium 3 composed of an amine compound and a binder resin is provided on a conductive support 1. In the present photoreceptor, the charge generation substance absorbs light to generate charge carriers, which are transported by the charge transport medium. In this case, it is desirable that the charge transporting material is transparent to light that generates charge carriers. Since the amine compound hardly absorbs in the visible wavelength range, it satisfies the condition that the charge generating substance and the absorption wavelength range do not overlap.

The photoconductor of FIG. 3 comprises a photoconductive layer 2 comprising a conductive support 1 and a charge generation layer 5 mainly composed of a charge generation substance 4 and a charge transport layer 3 composed of an amine compound and a binder resin.
2 is provided. In the present photoreceptor, light transmitted through the charge transport layer 3 reaches the charge generation layer 5 and is absorbed by the charge generation substance 4 to generate charge carriers. The charge carriers are injected into the charge transport layer 3 and transported. The photosensitive member of FIG. 4 is provided with a photosensitive layer 23 in which the order of stacking the charge generation layer 5 and the charge transport layer 3 of the photosensitive member of FIG. 3 is reversed. Generation and transport of charge carriers can be explained by the same mechanism as described above. The photosensitive member of FIG. 5 has a photosensitive layer 24 in which a protective layer 6 is further laminated on the charge generation layer 5 of the photosensitive member of FIG. 4 for the purpose of improving mechanical strength.

The photoconductor of the present invention as exemplified above is manufactured by a conventional method. For example, the above general formula (1)
It is prepared by dissolving the amine compound represented by the following together with a binder resin in a suitable solvent, and adding a charge generating substance, a sensitizing dye, an electron-withdrawing compound or a plasticizer, a pigment, and other additives as necessary. It can be produced by applying a coating liquid of the above onto a conductive support and drying it to form a photosensitive layer of several μ to several tens μ. In the case of a photosensitive layer composed of two layers of a charge generation layer and a charge transport layer, the above-mentioned coating solution is applied onto the charge generation layer, or the charge generation layer is applied onto the charge transport layer obtained by applying the above-mentioned coating solution. It can be manufactured by forming. Further, the photoreceptor thus manufactured may be provided with an adhesive layer, an intermediate layer, and a barrier layer, if necessary.

Solvents for preparing the coating solution include tetrahydrofuran, 1,4-dioxane, methyl ethyl ketone,
Examples thereof include polar organic solvents such as cyclohexanone, acetonitrile, N, N-dimethylformamide and ethyl acetate, aromatic organic solvents such as toluene and xylene, and chlorinated hydrocarbon solvents such as dichloromethane and dichloroethane. A solvent having high solubility for the amine compound and the binder resin is preferably used.

Examples of the sensitizing dyes include triarylmethane dyes such as methyl violet, brilliant green, crystal violet and acid violet, xanthene dyes such as rhodamine B, eosin S and rose bengal, and thiazine dyes such as methylene blue. Examples thereof include pyrylium dyes such as benzopyrylium salts, thiapyrylium dyes, and cyanine dyes.

Examples of the electron-withdrawing compound which forms a charge transfer complex with an amine compound include chloranil,
2,3-Dichloro-1,4-naphthoquinone, 1-nitroanthraquinone, 2-chloroanthraquinone, quinones such as phenanthrenequinone, aldehydes such as 4-nitrobenzaldehyde, 9-benzoylanthracene, indandione, 3,5- Dinitrobenzophenone, 2,
Ketones such as 4,7-trinitrofluorenone, 2,4,5,7-tetranitrofluorenone, phthalic anhydride,
Acid anhydrides such as 4-chloronaphthalic anhydride, cyano compounds such as tetracyanoethylene, terephthalalmalenonitrile, 9-anthrylmethylidenemalenonitrile, 3-
Examples thereof include phthalides such as benzalphthalide and 3- (α-cyano-p-nitrobenzal) -4,5,6,7-tetrachlorophthalide.

Examples of the binder resin include polymers and copolymers of vinyl compounds such as styrene, vinyl acetate, vinyl chloride, acrylic acid ester, methacrylic acid ester and butadiene, polyvinyl acetal, polycarbonate, polyester, polyphenylene oxide, polyurethane, Various resins that are compatible with the amine compound, such as cellulose ester, phenoxy resin, silicon resin, epoxy resin, and the like. The amount of the binder resin used is usually 0.4 to 10 times by weight, preferably 0.5 to 5 times the amine compound.
It is in the range of weight times.

Further, the photosensitive layer of the present invention may contain a well-known plasticizer for the purpose of improving film-forming property, flexibility and mechanical strength. Examples of the plasticizer include phthalic acid ester, phosphoric acid ester, chlorinated paraffin, methylnaphthalene, epoxy compound, chlorinated fatty acid ester and the like.

Further, as the electroconductive support on which the photosensitive layer is formed, the materials used in the well-known electrophotographic photoreceptors can be used. For example, a metal drum such as aluminum, stainless steel or copper, a sheet or a laminate of these metals, a vapor deposition product, a metal powder, carbon black, copper iodide or a conductive substance such as a polymer electrolyte is applied together with an appropriate binder. Conductive treated plastic film,
Examples thereof include a plastic drum, paper, a paper tube, and a plastic film and a plastic drum which are made conductive by containing a conductive substance.

[0055]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described specifically with reference to examples. Parts in the examples represent parts by weight, and the concentration represents Wt%.

Synthesis Example 1 (Synthesis Example of Compound No. 1) Synthesis of 5- [N- (4-formylphenyl) -N-phenylamino] acenaphthene 5- (N, N-diphenylamino) acenaphthene 6.4
3 g (0.02 mol) was dissolved in 70 ml of N, N-dimethylformamide, and 4.6 g of phosphorus oxychloride was added at room temperature.
(0.03 mol) was added dropwise over 10 minutes. It heated up at 50 degreeC and stirred for 14 hours. After confirming the disappearance of 5- (N, N-diphenylamino) acenaphthene, the reaction was terminated. The reaction product was added with 15 g of 93% sodium hydroxide (0.
375 mol) was added to an aqueous solution of 300 ml of water. The crystals precipitated upon cooling were filtered, washed with water, dried and
6.52 g (yield; 93.3%, melting point; 138.0-141.0 ° C) of [N- (4-formylphenyl) -N-phenylamino] acenaphthene was obtained.

Synthesis of 5- {N- [4- (2,2-diphenylvinyl) phenyl] -N-phenylamino} acenaphthene (Compound No. 1) 5- [N- (4-formylphenyl) synthesized above ) −
N-phenylamino] acenaphthene 2.80 g (0.0
08 mol) and diethyl diphenylmethylphosphonate 3
. 04 g (0.01 mol) was dissolved in 50 ml of N, N-dimethylformamide, and potassium-tert- was added at room temperature.
1.35 g (0.012 mol) of butoxide was added over 20 minutes. After the addition, stirring was continued for 2 hours. After confirming the disappearance of the formyl compound, the reaction was terminated. The reaction product was poured into 300 ml of methanol at 5 ° C. or lower, 30 ml of water was added dropwise, and the precipitated crystals were filtered, washed with methanol, and dried to give 3.38 g of crude crystals (yield; 84.
6%) was obtained. 3.0 g of this crystal was purified by column chromatography (carrier; silica gel, eluent; toluene / hexane = 1/4) to give 5- {N- [4- (2,2-
Diphenylvinyl) phenyl] -N-phenylamino}
2.30 g of acenaphthene (Compound No1) (purification yield;
76.7%, melting point; 189.0-190.5 ° C). The elemental analysis values were as shown below as C ₃₈ H ₂₉ N. Carbon: 91.39% (91.35%), hydrogen: 5.
73% (5.85%), nitrogen: 2.91% (2.80)
%) (Theoretical values are shown in parentheses.) Infrared absorption spectrum (KBr tablet method) has characteristic group frequencies (cm ⁻¹ ) of 3024, 1584, 1487, 129.
It was 2,695 mag.

Example 1 As a charge generating agent, the following chlorodian blue (charge generating agent No. 1)

[0059]

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1.5 parts of polyester resin (Byron 2
00, manufactured by Toyobo Co., Ltd.) (18.5 parts of 8% THF solution), placed in an agate pot containing agate balls, and spun for 1 hour with a planetary fine pulverizer (Frits) to disperse. The obtained dispersion liquid was applied onto the aluminum surface of an aluminum vapor-deposited PET film which is a conductive support using a wire bar, and dried under normal pressure at 60 ° C. for 2 hours and further under reduced pressure for 2 hours to give a film thickness of 0. A 3 μm charge generation layer was formed. On the other hand, Compound No. 1.5 parts of the amine compound of 1 was added to 18.75 parts of a 8% dichloroethane solution of a polycarbonate resin (Panlite K-1300, manufactured by Teijin Kasei Co., Ltd.), and ultrasonic waves were applied to completely dissolve the amine compound. Apply this solution on the charge generation layer with a wire bar,
After drying at 60 ° C. under normal pressure for 2 hours and further under reduced pressure for 2 hours to form a charge transport layer having a film thickness of about 20 μm, the photoreceptor N
o. 1 was produced. The sensitivity of this photoconductor was measured using an electrostatic copying paper test device (trade name "EPA-8100" manufactured by Kawaguchi Electric Co., Ltd.). First, the photoconductor is charged in the dark by corona discharge of -8 kV, and then 3.
Exposure to 0 lux of white light was performed, the time (seconds) until the surface potential decreased to half the initial surface potential was measured, and the half-exposure amount E1 / 2 (lux seconds) was determined. The initial surface potential of this photosensitive member was −1035 V, and E1 / 2 was 0.82 lux · second.

Examples 2 to 15 Photoreceptor Nos. 2 to 15 were prepared in the same manner as in Example 1 except that the charge generating agent and the charge transporting agent (amine compound) used in Example 1 were replaced with those shown in Table 1. It was made. The structures of the charge generating agents No2 to No4 shown in Table 1 are shown below.

Charge Generating Agent No. 2

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Charge Generating Agent No. Three

[Chemical 29]

Charge Generating Agent No. 4

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Photoreceptor No. Sensitivity was measured in the same manner as in Example 1 for 2 to 15. Table 2 shows the results.

[0066]

[Table 1]

[0067]

[Table 2]

Example 16 The charge transfer agent (amine compound) used in Example 1 was compound No. No. 1 amine compound and compound No. 1 Photoreceptor No. 4 was carried out in the same manner as in Example 1 except that the mixture of the amine compound of No. 4 was changed to 1: 1 by weight. 16 were produced. When the sensitivity of this photosensitive member was measured in the same manner as in Example 1, the initial surface potential was -1010 V and E1 / 2 was 0.79 lux.
Seconds.

Example 17 As a charge generating agent, 1.5 parts of α-TiOPc was added to 50 parts of a 3% THF solution of polyvinyl butyral resin (S-REC BX-L, manufactured by Sekisui Chemical Co., Ltd.), and an ultrasonic disperser 45 was used. Dispersed for minutes. The obtained dispersion is applied on an aluminum surface of an aluminum-deposited PET film as a conductive support using a wire bar, and dried at 60 ° C. under normal pressure for 2 hours and further under reduced pressure for 2 hours to obtain a film thickness of 0.2 μm. Was formed. On the other hand, Compound No. 1.5 parts of the amine compound of 1 is a polycarbonate resin (Panlite K-
1300, Teijin Kasei's 8% dichloroethane solution (18.75 parts) was added to the solution and ultrasonic waves were applied to completely dissolve the amine compound. This solution was coated on the charge generation layer with a wire bar and dried under normal pressure at 60 ° C. for 2 hours and further under reduced pressure for 2 hours to form a charge transport layer having a thickness of about 20 μm. 17 was produced. About this photoconductor, an electrostatic copying paper testing device (trade name "EPA-810"
0 ") was used to measure the sensitivity. First, the photoreceptor is charged by corona discharge of -8 kV in the dark, and then the light intensity is 1.
The amount of energy until the surface potential was reduced to half of the initial surface potential was determined by exposure with 0 μW / cm ² of 800 nm monochromatic light, and the half-exposure amount E1 / 2 (μJ / cm ² ) was measured. The initial surface potential of this photoconductor is -989V, and E1 /
2 was 0.59 μJ / cm ² .

Example 18 As a charge generating agent, the following trisazo compound was used instead of α-TiOPc.

[0071]

[Chemical 31]

A photoconductor No. 18 was prepared in the same manner as in Example 17 except that When the sensitivity of this photoreceptor was measured in the same manner as in Example 17, the initial surface potential was −
At 1037 V, E1 / 2 was 0.54 μJ / cm ² .

Example 19 The following thiapyrylium salt as a charge generating agent

[0074]

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0.1 part, Compound No. 5 as charge transport layer
Was added to 125 parts of an 8% solution of a polycarbonate resin (Panlite K-1300, manufactured by Teijin Chemicals Ltd.) in 8% dichloroethane, and ultrasonic waves were applied to completely dissolve the thiapyrylium salt and the amine compound. This solution is applied onto the aluminum surface of an aluminum vapor-deposited PET film, which is a conductive support, using a wire bar, and the temperature is 2 at 60 ° C. under normal pressure.
After being dried for 2 hours under reduced pressure, a photosensitive layer having a film thickness of 20 μm was formed, and the photosensitive member No. 19 was produced. About this photoconductor, an electrostatic copying paper testing device (trade name "EPA-8
100 ") was used to measure the sensitivity. First, the photoreceptor is charged by a corona discharge of +8 kV in the dark, and then 3.
Exposure to 0 lux of white light was performed, the time (seconds) until the surface potential decreased to half the initial surface potential was measured, and the half-exposure amount E1 / 2 (lux seconds) was determined. The initial surface potential of this photoconductor is +927 V, and E1 / 2 is 1.4 lux.
Seconds.

Example 20 The coating liquid of the charge transfer agent used in Example 1 was applied to aluminum vapor-deposited PE.
It was applied on the aluminum surface of the T film using a wire bar and dried under normal pressure at 60 ° C. for 2 hours and further under reduced pressure for 2 hours to form a charge transport layer having a film thickness of 10 μm. On the other hand, the same disazo compound as that used in Example 2 as the charge generating agent 3.
Add 0 parts to 18.5 parts of 8% THF solution of polyester resin (Byron 200, manufactured by Toyobo Co., Ltd.), put it in an agate pot containing agate balls, and rotate for 1 hour with a planetary type fine pulverizer (made by Fritz). And then dispersed. This dispersion contains T
200 ml of HF was added and mixed by stirring to obtain a coating liquid. This coating solution was applied onto the above charge transport layer by spraying and dried under normal pressure at 60 ° C. for 2 hours and further under reduced pressure for 2 hours to form a charge generation layer having a thickness of 0.5 μm. Further, a solution in which an alcohol-soluble polyamide resin is dissolved in isopropanol is applied onto the charge generation layer by spraying, and the solution is dried under normal pressure.
After forming an overcoat layer having a film thickness of 0.5 μm at 0 ° C. for 2 hours and further under reduced pressure for 2 hours, the photoreceptor No. 20 was produced. The sensitivity of this photoreceptor was measured in the same manner as in Example 1. The initial surface potential of this photoconductor is +863 V, and E1 /
2 was 1.2 lux · sec.

[0077]

INDUSTRIAL APPLICABILITY The novel amine compound of the present invention has an excellent charge transporting ability, and the electrophotographic photoreceptor of the present invention having a photosensitive layer containing these compounds on a conductive support has a high It exhibits excellent photoconductor characteristics such as sensitivity and high durability, and has the advantage that it can be widely used as an electrophotographic photoconductor.

[Brief description of drawings]

FIG. 1 is a sectional view of a single-layer photoconductor for electrophotography.

FIG. 2 is a cross-sectional view of a single-layer photoconductor for electrophotography in which a charge generating substance is dispersed.

FIG. 3 is a cross-sectional view of an electrophotographic photoconductor in which a charge generation layer and a charge transport layer are laminated on a conductive support in this order.

FIG. 4 is a cross-sectional view of an electrophotographic photoconductor in which a charge transport layer and a charge generation layer are laminated in this order on a conductive support.

FIG. 5 is a cross-sectional view of an electrophotographic photoconductor provided with a protective layer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conductive support 2, 21, 22, 23, 24 Photosensitive layer 3 Charge transport medium, charge transport layer 4 Charge generating substance 5 Charge generating layer 6 Protective layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Chieko Inayoshi 45 Miyukigaoka, Tsukuba, Ibaraki Hodogaya Chemical Industry Co., Ltd. Tsukuba Research Institute

Claims (1)

[Claims] 1. The following general formula (1): [In the formula, Ar ₁ represents an aryl group which may have a substituent, Ar ₂ represents a phenylene group, a naphthylene group, a biphenylene group or an anthrylene group which may have a substituent, and R ₁ represents hydrogen. Represents an atom, a lower alkyl group or a lower alkoxy group, X represents a hydrogen atom, an alkyl group which may have a substituent or an aryl group which may have a substituent, and Y represents a substituent. A good aryl group or the following general formula (2): (In the formula, R ₂ represents a hydrogen atom, a lower alkyl group or a lower alkoxy group, R ₃ represents a hydrogen atom, a halogen atom or a lower alkyl group, Z represents a hydrogen atom or an aryl which may have a substituent. Represents a group, and m and n represent an integer of 0 to 4). ] It has a photosensitive layer containing the amine compound represented by these, and the electrophotographic photosensitive member characterized by the above-mentioned.