JP3094501B2 - Photoconductor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoreceptor having a photosensitive layer containing a novel distyryl compound.

[0002]

2. Description of the Related Art Conventionally, there have been known photoconductors having a photosensitive layer mainly composed of an inorganic photoconductive substance and those having a photosensitive layer mainly composed of an organic photoconductive substance. Inorganic materials have disadvantages such as high toxicity, poor film-forming property, lack of flexibility, and high production cost.

On the other hand, studies on the use of an organic photoconductive substance typified by a polyvinyl carbazole compound for a photosensitive layer of a photoreceptor have been advanced and have already been put to practical use. In general, organic photoconductive materials have better transparency, are lighter and have better film formability than inorganic photoconductive materials, but are inferior in sensitivity, durability and stability due to environmental changes. Therefore, high sensitivity and repetitive stability, in which the charge generation function and the charge transport function in the photoconductive function are separately assigned to different substances,
A function-separated type photoconductor with excellent durability has been developed.

The above-mentioned function-separated type photoreceptor has a photosensitive layer in which a charge generating layer containing a charge generating material and a charge transporting layer containing a charge transporting material are stacked, or a charge generating material and a charge transporting material. Some have a photosensitive layer containing a material and a binder resin. In recent years, for example, JP-A-60-175052 and JP-A-62-1
JP 20346 discloses a photoreceptor containing a styryl compound having a symmetrical structure around a nitrogen atom as represented by the following general formula.

[0005]

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[0006]

However, the above-described photoreceptor is irradiated with ozone generated at the time of charging or high brightness by repeating image forming processes such as charging, exposure and static elimination. There is a problem that the charge transporting substance is deteriorated by a laser or the like, and the charge potential is lowered, or the residual potential is increased, thereby causing image loss. Further, the distyryl compound having a symmetric structure as described in the above publication has a disadvantage that the molecular size is large, the compatibility with the binder is low due to the three-dimensional structure, and crystals are easily precipitated.

Accordingly, an object of the present invention is to solve the above problems, contain a distyryl compound having excellent compatibility with a binder and excellent charge transport ability, and provide high sensitivity, charging ability, ozone resistance and NO _x resistance. An object of the present invention is to provide a photoreceptor which has excellent electrophotographic characteristics, has less fatigue deterioration due to repeated use, and has stable electrophotographic characteristics.

[0008]

The present invention provides a photosensitive member having a photosensitive layer on a conductive support, wherein the photosensitive layer contains a distyryl compound represented by the following general formula (I). I do.

[0009]

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Wherein R ₁ is a hydrogen atom, an alkyl group, a hydroxyl group, a halogen atom or a CF ₃ group, R _{2 and} R ₄ are a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom,
₃ represents an alkyl group which may have a substituent, an aralkyl group, an aryl group, a heterocyclic group, Ar _1, Ar ₂ are independently a hydrogen atom, alkyl group which may have a substituent, an aryl Group, heterocyclic group and fused polycyclic group. However
R ₃ is a phenyl group which may have a substituent, Ar ₁ is water
Elemental atom, Ar ₂ is a phenyl group having a CF ₃ group
And R ₃ is a phenyl group optionally having a substituent, and Ar ₁ is
A phenyl group having a CF ₃ group, a case where Ar ₂ is a hydrogen atom
Excludes The method for producing the distyryl compound of the general formula (I) used in the present invention is described below.

The distyryl compound of the present invention is, for example, an aldehyde compound represented by the following general formula (II):

[0012]

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(Wherein, Ar ₁ , Ar ₂ , R ₂ , R ₃ , and R ₄ are
Synonymous with (I). ) It can be synthesized by condensing with a phosphorus compound represented by the following general formula (III).

[0014]

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(Wherein R ₁ has the same meaning as (I). X is

[0016]

(Equation 1)

A trialkyl group or a triarylphosphonium group, or a dialkyl group or a diaryl phosphite group represented by PO (OR ₆ ) ₂ . In the formula, Y represents a halogen atom, and R ₅ and R ₆ each represent an alkyl group or an aryl group. In addition, the compound represented by the general formula (I) can also be synthesized by condensing the compounds represented by the following general formulas (IV) and (V).

[0018]

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(Wherein R ₁ , R ₂ , R ₃ , R ₄ , Ar ₁ , Ar ₂ are
X is the same as (III). As the reaction solvent in the above method, for example, hydrocarbons, alcohols, and ethers are preferable, and methanol, ethanol, iso-propyl alcohol, butanol, 2-methoxyethanol,
1,2-dimethoxyethane, bis (2-methoxyethyl) ether, dioxane, tetrahydrofuran, toluene, xylenedimethylsulfoxide, N, N-dimethylformamide, N-methylpyrrolidone, 1,3-dimethyl-2-imidazolidinone, etc. Is mentioned. Among them, polar solvents such as N, N-dimethylformamide and dimethylsulfoxide are preferred.

As the condensing agent, sodium hydroxide, potassium hydroxide, sodium amide, sodium hydrogen, and alcoholates such as sodium methylate and potassium ter-butoxide are used.

The reaction temperature is about 0 ° C. to about 100 ° C., preferably 10 ° C. to 80 ° C., and can be selected over a wide range.

All of the distyryl compounds represented by the above general formula (I) have a structural feature in that they are asymmetric with respect to a nitrogen atom, so that steric hindrance is small, and Shows good compatibility with the binder since crystallization can be suppressed. Especially ozone, N
Shows stable characteristics against oxidation gas O _X and the like.

The following is a general formula used for the photoreceptor of the present invention.
Although the distyryl compound represented by (I) is specifically shown, it is not limited thereto.

[0024]

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[0025]

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[0026]

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[0027]

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[0028]

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[0029]

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[0030]

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[0031]

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Although the distyryl compound is a photoconductive material, it acts as a charge transporting material and transports the charge carriers generated by absorbing light very efficiently.

[0033] on the electrically conductive substrate by forming a photosensitive layer containing the above distyryl compound alone or in combination of two or more, providing ozone resistance with high sensitivity, the photosensitive member of the present invention having excellent NO _X resistant Can be in the form of
For example, those shown in FIGS.

For example, a conductive support 1 as shown in FIG.
A function-separated type photoconductor in which a charge generation layer 5 containing a photoconductive material 2 and a charge transport layer 6 containing a charge transport material 3 are laminated in this order, or as shown in FIG. This is a function-separated type photoconductor in which a charge transport layer 6 containing a charge transport material 3 and a charge generation layer 5 containing a photoconductive material 2 are sequentially laminated on a conductive support 1. A photosensitive layer formed on a conductive support 1 as shown in FIG. 3 is a single-layer type photosensitive body in which a photosensitive layer 4 is formed by mixing a photoconductive material 2 and a charge transporting material 3 together with a binder. And FIG.
As shown in FIG. 3, a surface protective layer 7 is provided on the surface of the photoreceptor shown in FIG. 3, or a conductive support 1 and a photosensitive layer 4 are provided as shown in FIG.
And an intermediate layer 8 may be provided between them.

First, the case of manufacturing a laminated photoreceptor as shown in FIG. 1 as the photoreceptor of the present invention will be described. In this case, the photoconductive material was vacuum-deposited on the conductive support, or dissolved in a solvent such as an amine and applied, or the pigment was dissolved in a suitable solvent or a binder resin if necessary. A charge generation layer is formed by coating and drying a coating solution prepared by dispersing in a solution, and a solution containing the distyryl compound of the present invention represented by the general formula (I) and a binder resin is further coated and dried thereon. To form a charge transport layer. For vacuum deposition,
For example, phthalocyanines such as metal-free phthalocyanine, titanyl phthalocyanine, and aluminum chlorophthalocyanine are used. When dispersing, for example, a bisazo pigment is used. At this time, the ratio of the distyryl compound in the charge transport layer is set to 0.02 to 2 parts by weight, preferably 0.03 to 1.3 parts by weight with respect to 1 part by weight of the binder resin. 3 to 30 μm, preferably 5
It is desirable to set it to 20 μm. The thickness of the charge generation layer is 4 μm or less, preferably 2 μm or less.

It has been confirmed that such a function-separated type laminated photoreceptor has a sufficient charge holding ability, a small dark decay rate to such a degree that there is no problem in practical use, and an excellent sensitivity. Further, the half-exposure value is sufficiently smaller than that of a single-layer photoreceptor, and the distyryl compound is particularly effective as a charge transporting material for a laminated photoreceptor.

The case where a single-layer type photoreceptor as shown in FIG. 3 is manufactured as the photoreceptor in the present invention will be described.

In this case, fine particles of a photoconductive material are dispersed in a solution in which a distyryl compound and a binder resin are dissolved, and the resultant is coated on a conductive support and dried to form a photosensitive layer, thereby producing a photosensitive member. . At this time, the mixing ratio of the distyryl compound in the photosensitive layer is preferably 0.01 to 2 parts by weight, more preferably 0.05 to 1 part by weight, based on 1 part by weight of the binder resin in the photosensitive layer. When the amount of the photoconductive material is small relative to the binder resin in the photosensitive layer, sufficient sensitivity cannot be obtained when the amount is small, and when the amount is large, problems such as poor charging and weak mechanical strength of the photosensitive layer occur. Therefore, the amount is preferably 0.01 to 2 parts by weight, more preferably 0.2 to 1.2 parts by weight, per 1 part by weight of the binder resin in the photosensitive layer. In general, the thickness of the photosensitive layer is 3 to 30 μm, preferably 5 to 20 μm.

The single-layer type photoreceptor as described above has a sufficient charge holding ability as compared with the conventional one, and the dark decay rate is so small that there is no problem in practical use, and the sensitivity is high.

The photoreceptor of the present invention may be provided with an intermediate layer as shown in FIG. 5, thereby improving the adhesiveness, the coating property, the protection of the support, and the protection from the support side. The charge injection into the photosensitive layer can be improved.

As the material used for the intermediate layer, polyimide, polyamide, nitrocellulose polyvinyl butyral, polyvinyl alcohol, aluminum oxide and the like are suitable, and the film thickness is desirably 1 μm or less.

Further, the photoreceptor of the present invention may be provided with a surface protective layer. As the material used for the surface protective layer, acrylic resin, polyaryl resin, polycarbonate resin, polymers such as urethane resin as it is,
Alternatively, a material in which a low-resistance compound such as tin oxide or indium oxide is dispersed is suitable.

Further, an organic plasma polymerized film can be used. The organic plasma polymerized film is appropriately oxygen if necessary,
It may contain nitrogen, halogen, and atoms of Groups 3 and 5 of the periodic table.

As the conductive support used in the photoreceptor of the present invention, a sheet or a drum made of copper, aluminum, iron, nickel or the like or a plate is used. In addition, these metals are vacuum-deposited or electroless-plated on a plastic film or the like, or a layer of a conductive compound such as a conductive polymer, indium oxide or tin oxide is similarly formed on a support such as paper or a plastic film. It is provided by coating or vapor deposition.

The photoconductive material used in the photoreceptor of the present invention includes, for example, bisazo pigments, triarylmethane dyes, thiazine dyes, oxazine dyes, xanthene dyes, cyanine dyes, styryl dyes, Organic substances such as pyrylium dyes, azo dyes, chiacdrine dyes, indigo pigments, perylene pigments, polycyclic quinone pigments, bisbenzimidazole pigments, induthrone silica pigments, squarylium pigments, phthalocyanine pigments, Examples include inorganic substances such as selenium, selenium / tellurium, selenium / arsenic, cadmium sulfide, and amorphous silicon. In addition, any material that absorbs light and generates charge carriers with extremely high efficiency can be used.

The binder resin used in the production of the above-mentioned photoreceptor is electrically insulating, and is measured by 1 ×
It is desirable to have a volume resistance of 10 ¹² Ω · cm or more. For example, a binder such as a thermoplastic resin, a thermosetting resin, a photocurable resin, or a photoconductive resin known per se can be used. Specifically, saturated polyester resin, polyamide resin, acrylic resin, ethylene-vinyl acetate resin, ion-crosslinked olefin copolymer (ionomer),
Styrene-butadiene block copolymer, polycarbonate, vinyl chloride-vinyl acetate copolymer, cellulose ester, polyimide, thermoplastic resin such as styrene resin; epoxy resin, urethane resin, silicone resin, phenol resin, melamine resin, xylene resin, Thermosetting resins such as alkyd resins and thermosetting acrylic resins; photo-setting resins; polyvinyl carbazole, polyvinyl pyrene,
Examples thereof include photoconductive resins such as polyvinyl anthracene and polyvinyl pyrrole, and these binder resins are used alone or in combination of two or more.

When the charge transporting material is a polymer charge transporting material that can be used as a binder, it is not necessary to use another binder resin.

The photoreceptor of the present invention may contain a binder resin together with a plasticizer such as halogenated paraffin, polychlorinated biphenyl, dimethylnaphthalene, dibutylphthalate, O-terphenyl, chloranil, tetracyanoethylene,
Electron-withdrawing sensitizers such as 2,4,7-trinitrofluorenone, 5,6-dicyanobenzoquinone, tetracyanoquinodimethane, tetrachlorophthalic anhydride, 3,5-dinitrobenzoic acid, methyl violet, rhodamine B; Sensitizers such as cyanine dyes, pyrylium salts and thiapyrylium salts may be used.

[0049]

[Synthesis Example] A method for synthesizing the distyryl compound represented by the above compound example (21) is shown below.

The following formula:

[0051]

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4.43 g of the aldehyde compound represented by
And the following formula:

[0053]

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3.04 g of a phosphonate compound represented by the following formula:
Was dissolved in 40 ml of dimethylformamide. While cooling the obtained solution to 5 ° C. or lower, a suspension containing 1.68 g of potassium ter-butoxide in 20 ml of dimethylformamide was added dropwise, and the mixture was stirred at room temperature for 4 hours, and then stirred at 80 ° C.
For 2 hours to complete the reaction. The obtained mixture was added to 500 ml of ice water and neutralized with dilute hydrochloric acid. About 30
After minutes, the precipitated crystals are filtered, and the filtered product is washed with water,
It was dissolved in benzene and separated and purified by silica gel column chromatography. After the benzene in the effluent was distilled off, recrystallization from acetonitrile yielded 4.2 g of pale yellow crystals (yield 70.8).
%). (Mp 123-124 ° C) The results of elemental analysis are as follows.

[0055]

[Table 1]

[0056]

EXAMPLES The distyryl compounds of the present invention used in the following Examples are those synthesized according to the above-mentioned Synthesis Examples or methods similar thereto.

Embodiment 1

[0058]

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0.45 parts by weight of the disazo compound represented by the above general formula (VI) and a polyester resin (Vylon 200,
0.45 parts by weight of cyclohexanone 5
It was dispersed by a sand mill together with 0 parts by weight. The resulting dispersion of the disazo compound was applied on a 100-μm-thick aluminized mylar using a film applicator to a dry film thickness of 0.3 g / m ² and then dried to form a charge generation layer. On top of this, 50 parts by weight of the distyryl compound (1) and polycarbonate (K-1300, Teijin Chemicals Ltd.)
A solution in which 50 parts by weight of 1,4-dioxane was dissolved in 400 parts by weight was applied so as to have a dry film thickness of 16 μm, and dried to form a charge transport layer. A photoreceptor having a photosensitive layer was produced.

The photoreceptor thus prepared was used as a commercially available electrophotographic copying machine (EP-450Z manufactured by Minolta Camera Co., Ltd.).
Is charged by a −6 Kv corona discharge, and the initial surface potential V ₀ (v), the exposure amount required to attenuate the surface potential to half of the initial surface potential (hereinafter, the half-exposure amount) E
The decay rate DDR ₁ (%) of the initial potential when left in the dark for _1/2 (Lux · sec) for 1 second was measured. Table 2 shows the results.

Examples 2 to 4 Example 1 was repeated except that the distyryl compounds (2), (3) and (5) were used in place of the distyryl compound (1) used in Example 1.
Three kinds of laminated photoreceptors were produced in the same manner as in the above. For each photoconductor, V ₀ , E _1/2 , D
DR ₁ was measured and the results are shown in Table 2.

Embodiment 5

[0063]

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0.45 parts by weight of the disazo compound represented by the above general formula (VII) and a polystyrene resin (molecular weight 4000)
0) 0.45 parts by weight was dispersed with a sand mill together with 50 parts by weight of cyclohexanone. Using a film applicator, apply a dry film thickness of 0.3 g to the obtained disazo compound dispersion liquid on a 100-μm-thick aluminized mylar.
/ M ² and then dried to form a charge generation layer. On this, 50 parts by weight of a distyryl compound (7) and a polyarylate resin (U-100, manufactured by Unitika Ltd.) 5
A solution having 0 parts by weight dissolved in 400 parts by weight of 1,4-dioxane is applied so as to have a dry film thickness of 20 μm, and dried to form a charge transport layer. The body was made. V ₀ , E _1/2 , and DDR ₁ of this photoreceptor were measured in the same manner as in Example 1, and the results are shown in Table 2.

Examples 6 to 8 Three methods were performed in the same manner as in Example 1 except that the distyryl compounds (8), (9) and (11) were used in place of the distyryl compound (7) used in Example 5. Was produced. For each photosensitive member, V ₀ , E _1/2 ,
DDR ₁ was measured and the results are shown in Table 2.

Embodiment 9

[0067]

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0.45 parts by weight of the polycyclic quinone pigment represented by the above general formula (VIII), polycarbonate (K-1300,
0.45 parts by weight of dichloroethane 50 (manufactured by Teijin Chemicals Limited)
It was dispersed by a sand mill together with parts by weight. The resulting dispersion of the polycyclic quinone pigment was applied on a 100-μm-thick aluminized mylar using a film applicator to a dry film thickness of 0.4 g / m ^2, and then dried to form a charge generation layer. Formed. On top of this, the distyryl compound (13) 60
A solution prepared by dissolving 50 parts by weight of a polyarylate resin (U-100, manufactured by Unitika Ltd.) in 400 parts by weight of 1,4-dioxane is applied so that the dry film thickness becomes 18 μm, and dried. A charge transport layer was formed to prepare a photoreceptor having a two-layer photosensitive layer. V ₀ , E _1/2 , and DDR ₁ of this photoreceptor were measured in the same manner as in Example 1, and the results are shown in Table 2.

Further, regarding the above-mentioned photoreceptor, a commercially available electrophotographic copying machine (EP-450Z manufactured by Minolta Camera Co., Ltd.)
Was repeated at the time of negative charging. Even after the actual printing of 1000 sheets, the final image has excellent gradation as well as the initial image, there is no change in sensitivity, a clear image is obtained, and the photoreceptor of the present invention is confirmed to have stable repetition characteristics. Was done.

Examples 10 to 11 Example 9 was repeated except that the distyryl compounds (14) and (18) were used in place of the distyryl compound (13) used in Example 9.
Two kinds of laminated photoreceptors were produced in the same manner as in the above. V ₀ in the same manner as in Example 1 for each of the photosensitive member, E _1/2, D
DR ₁ was measured and the results are shown in Table 2.

Embodiment 12

[0072]

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0.45 parts by weight of a perylene pigment represented by the above general formula (IX) and 0.45 parts by weight of butyral resin (BX-1, manufactured by Sekisui Chemical Co., Ltd.) were mixed with 50 parts by weight of dichloroethane by a sand mill. Dispersed. The resulting perylene pigment dispersion was applied on a 100-μm-thick aluminized mylar using a film applicator so that the dry film thickness was 0.4 g / m 2, and then dried to form a charge generation layer. A solution prepared by dissolving 50 parts by weight of the distyryl compound (20) and 50 parts by weight of a polycarbonate resin (PC-Z, Mitsubishi Gas Chemical Co., Ltd.) in 400 parts by weight of 1,4-dioxane was further dried to a dry film thickness of 18 μm. And dried to form a charge transport layer, thereby producing a photoreceptor having a two-layer photosensitive layer. V ₀ , E _1/2 , and DDR ₁ of this photoreceptor were measured in the same manner as in Example 1, and the results are shown in Table 2.

Examples 13 and 14 Two kinds of laminated photoreceptors were prepared in the same manner as in Example 12 except that the distyryl compounds (21) and (23) were used in place of the distyryl compound (20) used in Example 12. Was prepared. For each photoconductor, V ₀ ,
E _1/2 and DDR ₁ were measured, and the results are shown in Table 2.

Example 15 0.45 parts by weight of titanyl phthalocyanine pigment and 0.45 parts by weight of butyral resin (PC-Z, manufactured by Mitsubishi Gas Chemical Co., Ltd.) were dispersed together with 50 parts by weight of dichloroethane by a sand mill. The obtained dispersion liquid of titanyl phthalocyanine pigment was applied on a 100-μm-thick aluminized mylar using a film applicator so that the dry film thickness was 0.3 g / m ^2, and then dried to form a charge generation layer. . On top of this, 50 parts by weight of a distyryl compound (25) and 50 parts of a polycarbonate resin (PC-Z, manufactured by Mitsubishi Gas Chemical Co., Ltd.)
Photosensitive member having a photosensitive layer consisting of two layers by applying a solution obtained by dissolving 400 parts by weight of 1,4-dioxane by weight so as to have a dry film thickness of 18 μm and drying to form a charge transport layer. Was prepared. V ₀ , E _1/2 , and DDR ₁ of this photoreceptor were measured in the same manner as in Example 1, and the results were shown in Table 2.
Shown in

Examples 16 to 17 Two kinds of laminated photoconductors were prepared in the same manner as in Example 15 except that the distyryl compounds (26) and (28) were used in place of the distyryl compound (25) used in Example 15. Was prepared. For each photoconductor, V ₀ ,
E _1/2 and DDR ₁ were measured, and the results are shown in Table 2.

Example 18 0.45 parts by weight of copper phthalocyanine and 0.2 parts by weight of tetranitro copper phthalocyanine were dissolved in 500 parts by weight of 98% concentrated sulfuric acid with sufficient stirring. This was mixed with 5000 parts by weight of water to precipitate a photoconductive material composition of copper phthalocyanine and tetranitro copper phthalocyanine, which was then filtered, washed with water, and dried at 120 ° C. under reduced pressure. 10 parts by weight of the photoconductive composition thus obtained was added to a thermosetting acrylic resin (Acrydic A-405, Dainippon Ink.
22.5 parts by weight of a melamine resin (Super Beckamine J820, manufactured by Dainippon Ink Co., Ltd.) 7.5 parts by weight,
15 parts by weight of the distyryl compound (33) were placed in a ball mill pot together with 100 parts by weight of a solvent obtained by mixing methyl ethyl ketone and xylene in the same amount, and dispersed for 48 hours to prepare a photosensitive coating solution. This coating solution was applied on an aluminum support and dried to form a photosensitive layer having a thickness of about 15 μm, thereby producing a single-layer type photosensitive member.

The photoreceptor thus produced was used as a commercially available electrophotographic copying machine (EP-350Z manufactured by Minolta Camera Co., Ltd.).
And V ₀ , E _1/2 , and DDR ₁ were measured in the same manner as in Example 1 except that the battery was charged by corona discharge of +6 Kv. The results are shown in Table 3.

Examples 19 to 21 Three methods were performed in the same manner as in Example 18 except that the distyryl compounds (34), (36) and (37) were used in place of the distyryl compound (33) used in Example 18. Was produced.
V ₀ , E _1/2 , and D were obtained in the same manner as in Example 1 except that each photoconductor was charged by corona discharge of +6 Kv.
DR ₁ was measured and the results are shown in Table 3.

Comparative Examples 1-4 The distyryl compounds (1-1), (1-2) and (1) shown below were used in place of the distyryl compound (33) used in Example 18.
Four types of single-layer type photoreceptors were produced in the same manner as in Example 18 except that (3) and (1-4) were used. V ₀ , E _1/2 , and DDR ₁ were measured in the same manner as in Example 1 except that each photoconductor was charged by corona discharge of +6 Kv. The results are shown in Table 3.

[0081]

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Comparative Examples 5 to 7 Instead of the distyryl compound (33) used in Example 18, the following distyryl compounds (1-5), (1-6) and (1
Three types of single-layer type photoreceptors were produced in the same manner as in Example 18 except that -7) was used. V ₀ , E _1/2 , and DDR ₁ were measured in the same manner as in Example 1 except that each photoconductor was charged by corona discharge of +6 Kv. The results are shown in Table 3.

[0083]

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[0084]

[Table 2]

[0085]

[Table 3]

[0086]

The photoreceptor of the present invention, having a photosensitive layer containing the above-mentioned distyryl compound, has excellent charge transporting properties, a sufficiently small dark decay rate, high sensitivity, charging ability and ozone resistance. , excellent resistance to NO _X resistance, it is possible to provide a fatigue deterioration is small photoreceptor in the case of repeated use.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a photoreceptor according to the present invention in which a charge generation layer and a charge transport layer are laminated on a conductive support.

FIG. 2 is a schematic sectional view of a photoreceptor according to the present invention in which a charge transport layer and a charge generation layer are laminated on a conductive support.

FIG. 3 is a schematic sectional view of a photosensitive member according to the present invention having a photosensitive layer on a conductive support.

FIG. 4 is a schematic cross-sectional view of a photoconductor according to the present invention in which a surface protective layer is provided on the surface of a single-layer photoconductor.

FIG. 5 is a schematic cross-sectional view of a photosensitive member according to the present invention in which an intermediate layer is provided between a conductive support and a photosensitive layer.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 conductive support 2 photoconductive material 3 charge transport material 4 photosensitive layer 5 charge generation layer 6 charge transport layer 7 surface protective layer 8 intermediate layer

Claims (1)

(57) [Claims] 1. A photoreceptor comprising a conductive support and a photosensitive layer containing a distyryl compound represented by the following general formula (I). Embedded image (Wherein, R ₁ is a hydrogen atom, an alkyl group, a hydroxyl group, a halogen atom or a CF ₃ group, R _{2 and} R ₄ are a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom, and R ₃ has a substituent. also alkyl group, an aralkyl group, an aryl group, a heterocyclic group, Ar _1, Ar ₂ are independently a hydrogen atom, alkyl group which may have a substituent, an aryl group, a heterocyclic group, Chijimigoo A cyclic group, provided that R ₃ is
A phenyl group which may have a substituent, Ar ₁ is a hydrogen atom,
When Ar ₂ is a phenyl group having a CF ₃ group and R
₃ is a phenyl group which may have a substituent, Ar ₁ is a CF ₃ group
Except when Ar ₂ is a hydrogen atom.
Good. )