JP2976313B2 - Electrophotographic photoreceptor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic photoreceptor,
In particular, a specific titanyl phthalocyanine pigment and a specific compound are used as a photoconductive material, and are effective for printers, copiers, and the like.
The present invention relates to an electrophotographic photosensitive member suitable for forming an image using D light or the like.

[0002]

2. Description of the Related Art In recent years, as a photoconductive material used for an electrophotographic photosensitive member, an organic photoconductive material has been widely used in place of an inorganic photoconductive material. The reason is that, in the organic photoconductive material, a wide variety of materials can be obtained depending on the combination of synthetic substances and synthesis conditions, the degree of freedom of material selection is large, and a desired photoreceptor can be easily prepared according to the purpose. This is because it can be manufactured.

Further, the photoreceptor using the organic photoconductive material is of a function-separated type in which the carrier generation function and the carrier transport function are shared by different materials, so that the degree of freedom of material selection is increased. Electrophotographic properties such as charging ability, sensitivity and durability have been expected to be further expanded.

On the other hand, in the copying industry, further improvement in image quality and image editing function are demanded, and recording apparatuses such as digital copying machines or printers corresponding to the functions are being developed. There is a strong demand for improvement of the photoconductor. In the digital recording apparatus, in general, a dot latent image is formed on a photoconductor by exposing in a dot shape using a laser beam modulated by an image signal, and the latent image is developed by a reversal developing method to form an image. To do. In this case, as the laser light, a semiconductor laser device capable of simplifying, miniaturizing, and reducing the cost of the exposure apparatus is preferably used, and the oscillation wavelength is preferably
The infrared region is 750 nm or more. Therefore, the photoreceptor used is required to have high sensitivity in a wavelength region of at least 750 to 850 nm.

By the way, various organic dyes or organic pigments have been proposed as a carrier-generating substance for use in the function-separated type photoreceptor, for example, a polycyclic quinone pigment represented by dibromance anthrone, a pyrylium dye. ,
Further, eutectic complexes of the pyrylium dye and polycarbonate, squarium pigments, phthalocyanine pigments, azo pigments, and the like have been put to practical use. Among them, phthalocyanine pigments have been attracting attention particularly for electrophotographic photosensitive members corresponding to semiconductor laser light sources because of their high photoelectric conversion quantum efficiency and high spectral sensitivity up to the near infrared region.

For such purposes, electrophotographic photoreceptors using copper phthalocyanine, metal-free phthalocyanine, chloroindium phthalocyanine, chlorogallium phthalocyanine and the like have been reported. In recent years, however, titanyl phthalocyanine has been particularly noted. For example,
-239248, 62-670943, 62-272272, 63-1161
No. 58 discloses an electrophotographic photoreceptor using various crystal forms of titanyl phthalocyanine.

[0007]

It is well known that when phthalocyanine is generally used for an electrophotographic photosensitive member, its characteristics significantly change depending on the crystal form. Therefore,
A phthalocyanine for an electrophotographic photosensitive member needs to have a stable crystal form having high sensitivity and excellent chargeability. However, none of the conventionally disclosed titanyl phthalocyanines has high sensitivity and high stability in repeated use in a high-temperature and high-humidity environment. That is, although α-type titanyl phthalocyanine has high sensitivity, it has poor stability, and β-type titanyl phthalocyanine has disadvantages of poor sensitivity.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and has as its object to provide an electrophotographic photosensitive member which is highly sensitive, is not easily affected by an external environment, and has good repeated use characteristics.

[0009]

In order to achieve the above object, the electrophotographic photoreceptor of the present invention comprises a titanyl phthalocyanine containing the largest number of water molecules in terms of the number of molecules in a component analysis of an adsorbed gas in a vacuum. Pigments and the following general formulas [I] to
It is characterized by comprising at least one compound represented by [III].

[0010]

Embedded image In the formula, Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ each represent a phenyl group or a naphthyl group, and at least one of Ar _{1 to} Ar _{4 has} an amino group (including a substituted amino group) as a substituent. n represents an integer of 0 or 1.

[0011]

Embedded image In the formula, Ar ₅ and Ar ₆ each represent an alkyl group or an aryl group, and Ar ₅ and Ar ₆ may combine to form a ring. R ₁ represents a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom.

[0012]

Embedded image In the formula, Ar ₇ and Ar ₈ each represent a phenyl group or a naphthyl group, Ar ₉ represents a phenylene group, and B represents a benzyl group or a phenethyl group.

Hereinafter, the present invention will be described in detail.

The titanyl phthalocyanine pigment according to the present invention is different from the titanyl phthalocyanine pigment disclosed in each of the above-mentioned publications in the state of aggregation of the pigment crystals. It has the feature that it is contained most, has an agglomerated state in which visible and near-infrared absorption spectra show maximum absorption at 780 nm to 860 nm, and has extremely high sensitivity to semiconductor laser light, etc. It can be demonstrated.

In the present invention, the above component analysis of the adsorbed gas can be measured by the following method.

An ampoule in which 0.5 g of titanyl phthalocyanine pigment was sealed in a glass tube having an internal volume of 3.0 cm ³ under the condition of humidity of 60% under the atmosphere was attached to the measuring chamber, and the degree of vacuum was 2 × 10 ^-8 Torr.
The ampule is ruptured in the measuring chamber, and the molecular weight of the gas released from the ampule is detected by a quadrupole mass spectrometer to analyze the components.

Further, the water molecular weight of the titanyl phthalocyanine pigment in the carrier generating substance from the photosensitive drum can be measured.

That is, the photosensitive drum is treated with methanol (purity).
(98% or more) at room temperature to separate the photosensitive layer from the aluminum substrate. Next, the photosensitive layer separated from the substrate is dissolved in methylene chloride, and filtered while repeating washing with methylene chloride (purity of 98% or more) using a filter paper. The precipitate on the filter paper is dissolved in t-butyl acetate (purity of 98% or more), and the precipitate is separated from the obtained liquid by a centrifuge.

After washing the titanyl phthalocyanine thus obtained and drying it at 120 ° C., the amount of adsorbed molecules can be determined by the method described above.

As a result of this component analysis, each molecule of water, hydrogen, nitrogen, oxygen, carbon dioxide and the like is detected in the titanyl phthalocyanine pigment, but the titanyl phthalocyanine pigment according to the present invention contains the largest amount of water molecules. The feature is that there is.

Further, the titanyl phthalocyanine pigment according to the present invention preferably has an endothermic peak between 80 ° C. and 120 ° C. in differential thermal analysis from the viewpoint of sensitivity and repetition characteristics.

Here, the above differential thermal analysis was performed on 10 mg of the titanyl phthalocyanine pigment under the conditions of an atmospheric humidity of 60% and a heating rate of 10 ° C./min.
An endothermic peak of 0 degree or more.

Particularly preferably, the titanyl phthalocyanine pigment according to the present invention has an X-ray diffraction spectrum with respect to Cu-Kα ray at a Bragg angle 2θ of 9.5 ° ± 0.2 °, 27.2 °.
Titanyl phthalocyanine pigment having a peak at ± 0.2 °.

The basic structure of the titanyl phthalocyanine pigment used in the present invention is represented by the following general formula.

[0025]

Embedded image In the formula, X ¹ , X ² , X ³ and X ⁴ each represent a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group;
m, l, and k each represent an integer of 0-4.

The method for producing the titanyl phthalocyanine used in the present invention will be described below. For example, 1,3-diiminoisoindoline and sulfolane are mixed, titanium tetrapropoxide is added thereto, and the mixture is reacted under a nitrogen atmosphere. The reaction temperature is 80 ° C to 300 ° C, especially 100 ° C to 26 ° C.
0 ° C. is preferred. After completion of the reaction, the mixture is left to cool, and the precipitate is collected by filtration to obtain titanyl phthalocyanine. Then, by treating this with a mixed solvent, the desired titanyl phthalocyanine can be obtained.In addition to a general stirring device, a homomixer,
Dispersers, agitators, ball mills, sand mills, attritors and the like can be used.

In the present invention, in addition to the titanyl phthalocyanine pigment of the present invention, other carrier generating substances may be used together with the carrier generating substance as long as the effects of the present invention are not impaired. Examples of such a carrier generating material that can be used in combination include:
The crystalline form differs from titanyl phthalocyanine of the present invention, for example, titanyl phthalocyanine of α-type, β-type, α-β mixed type, amorphous type, etc., azo pigment, anthraquinone pigment, perylene pigment, polycyclic quinone pigment, squarium Pigments and the like.

To produce the photoreceptor of the present invention, for example,
The above-mentioned titanyl phthalocyanine pigment according to the present invention is mixed and dispersed in a solution in which a binder resin is dissolved in a solvent, and a coating solution obtained by dissolving a carrier transporting material described below is added to an intermediate layer (undercoating) if necessary. The photosensitive member having a single-layer structure shown in FIG. 1 or FIG. 2 is obtained by applying a coating method on the conductive support provided with the layer) by, for example, a method such as dip coating, spray coating, or spiral coating. In the drawings, 1 is a conductive support, 4 "is a photosensitive layer having a single-layer structure, and 5 is an intermediate layer.

However, from the viewpoint of obtaining a photosensitive member having high sensitivity characteristics and high durability, it is preferable to use a function-separated type photosensitive member having a laminated structure shown in FIGS. In this case, the carrier generation layer 2 was formed by applying a coating liquid obtained by mixing and dispersing the pigment in a solution in which a binder resin was dissolved, on the conductive support 1 having the intermediate layer 5 as necessary. Thereafter, a coating solution containing a carrier transporting substance is applied on the carrier generating layer 2 to form a carrier transporting layer 3 thereon, and the photosensitive layer 4 having a two-layer structure (FIGS. 3 and 5), or vice versa. A layered photosensitive layer 4 '(FIGS. 4 and 6) is formed. Hereinafter, a description will be given focusing on a photoconductor having a two-layered photosensitive layer.

The carrier generating layer 2 and the carrier transporting layer 3 in the case of forming a two-layered photosensitive layer can be provided by the following method. (A) A method in which a solution in which a carrier-generating substance and a carrier-transporting substance are respectively dissolved in an appropriate solvent, or a solution in which a binder is added and mixed and dissolved is applied. (B) A method in which a carrier-generating substance and a carrier-transporting substance are each made into fine particles in a dispersion medium by a ball mill, a homomixer, ultrasonic waves or the like, and a binder is added, if necessary, and mixed and dispersed, and a dispersion liquid obtained is applied.

As the solvent or dispersion medium used for forming the carrier generation layer and the carrier transport layer, butylamine,
N, N-dimethylformamide, acetone, methyl ethyl ketone, cyclohexanone, benzene, toluene, xylene, chloroform, 1,2-dichloroethane, dichloromethane, tetrahydrofuran, dioxane, methanol, ethanol, isopropanol, ethyl acetate, butyl acetate, dimethyl sulfoxide and the like. be able to. When a binder is used for forming the carrier generation layer or the carrier transport layer, any binder can be used, but in particular, a polymer that is hydrophobic and has a high dielectric constant and an electrical insulating film-forming ability. Polymers are preferred. Examples of such 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) Styrene-butadiene copolymer 10) Vinylidene chloride-acrylonitrile copolymer Compound 11) Vinyl chloride-vinyl acetate copolymer 12) Vinyl chloride-vinyl acetate-maleic anhydride copolymer 13) Silicone resin 14) Silicone-alkyd resin 15) Phenol-formaldehyde resin 16) Styrene-acrylic copolymer resin 17 ) Styrene-alkyd resin 18) Poly-N-vinylcarbazole 19) Polyvinyl butyral 20) Polycarbonate Z resin These binders can be used alone or as a mixture of two or more.

The ratio of the carrier-generating substance to the binder resin is preferably 10 to 600% by weight, more preferably 50 to 400% by weight.

The thickness of the carrier generating layer 2 thus formed is preferably 0.01 to 20 μm, more preferably 0.05 to 5 μm.

When the carrier generating material is dispersed to form the carrier generating layer 2, it is preferable that the carrier generating material is a powder having an average particle diameter of 2 μm or less, preferably 1 μm or less. That is, if the particle size is too large, the dispersion in the layer becomes poor, and the particles partially protrude from the surface, resulting in poor surface smoothness. In some cases, discharge occurs at the protruding portions of the particles, or The toner particles tend to adhere to the toner and a toner filming phenomenon easily occurs.

In the present invention, at least one of the compounds represented by the general formulas [I] to [III] is used as the carrier transporting substance.

The compounds represented by the general formulas [I] to [III] will be described below in order.

In the general formula [I], Ar ₁ , A
r ₂ , Ar ₃ and Ar ₄ each represent a phenyl group or a naphthyl group, and at least one of Ar _{1 to} Ar _{4 has} an amino group (including a substituted amino group) as a substituent.
As the substituted amino group in this case, a dialkylamino group,
There are a diarylamino group and the like, and specific examples include a dimethylamino group, a diethylamino group and a diphenylamino group.

The groups represented by Ar _{1 to} Ar ₄ may have another substituent (eg, an alkyl group, an alkoxy group, etc.) as a substituent in addition to the amino group and the substituted amino group.

The following are typical examples of the compound represented by the general formula [I], but the present invention is not limited thereto.

[0041]

Embedded image

[0042]

Embedded image

[0043]

Embedded image

Next, in the general formula [II], A
The alkyl group represented by r ₅ and Ar ₆ is, for example, a methyl group,
An ethyl group, a propyl group, a butyl group, Ar _5, A
The aryl group represented by r ₆ is, for example, a phenyl group, a naphthyl group or the like, and these groups may further have a substituent (eg, an alkyl group, an alkoxy group, a halogen atom, etc.). In addition, Ar ₅ and Ar ₆ may combine to form a ring such as carbazole or indoline.

In the general formula [II], the alkyl group represented by R ₁ is, for example, a methyl group, an ethyl group, a propyl group or the like, and the alkoxy group represented by R ₁ is, for example, a methoxy group, an ethoxy group, a butoxy group. Group, etc.
_The halogen atom represented by ₁ is, for example, a fluorine atom, a bromine atom or the like. The alkyl group or the alkoxy group represented by R ₁ may further have a substituent.

The following are typical examples of the compound represented by the general formula [II], but the present invention is not limited thereto.

[0047]

Embedded image

[0048]

Embedded image

Next, in the general formula [III], Ar ₇
And Ar ₈ each represent a phenyl group or a naphthyl group, and each of these groups may further have a substituent. Examples of the substituent include an alkyl group and an alkoxy group. In the general formula [III],
The benzyl group or phenethyl group represented by B may have a substituent such as an alkyl group, an alkoxy group, or a substituted amino group on the benzene ring, and the alkyl group of the benzyl group or phenethyl group represented by B A part of the hydrogen atoms may be substituted with another alkyl group, an aryl group, or the like. In this case, the alkyl groups of the substituents may be bonded to each other to form a cycloalkyl ring or the like.

The following are typical specific examples of the compound represented by the general formula [III], but the present invention is not limited thereto.

[0051]

Embedded image

[0052]

Embedded image

In the present invention, in addition to the above-mentioned compound of the present invention, other carrier transporting substances may be used in combination as long as the effects of the present invention are not impaired.

The ratio of the carrier transporting substance to the binder resin is preferably 10 to 500% by weight, and the thickness of the carrier transporting layer is preferably 1 to 100 μm, more preferably 5 to 30 μm.

The photosensitive layer of the photoreceptor of the present invention may contain an electron accepting substance for the purpose of improving the sensitivity, reducing the residual potential, or reducing the fatigue during repeated use. Examples of such electron accepting substances include succinic anhydride, maleic anhydride, dibromosuccinic anhydride, phthalic anhydride, tetrachlorophthalic anhydride, tetrabromophthalic anhydride, 3-nitrophthalic anhydride, and 4-nitrophthalic anhydride. Acid, pyromellitic anhydride, melitic anhydride, tetracyanoethylene, tetracyanoquinodimethane, o-dinitrobenzene, m-dinitrobenzene, 1,3,5-trinitrobenzene, p-nitrobenzonitrile, picryl chloride, Quinone chlorimide, chloranil, bromanil, dichlorodicyano-p-benzoquinone, anthraquinone, dinitroanthraquinone, 9-fluorenylidenemalonodinitrile, polynitro-9-fluorenylidenemalonodinitrile, picric acid, o-nitrobenzoic acid, p-nitrobenzo Acid, 3,5-dinitro-benzoic acid,
Pentafluorobenzoic acid, 5-nitrosalicylic acid, 3,
Examples thereof include 5-dinitrosalicylic acid, phthalic acid, melitic acid, and other compounds having a high electron affinity.
The addition ratio of the electron accepting substance is 10% by weight of the carrier generating substance.
0.01 to 200 is desirable for 0, and 0.1 to 100 is more preferred.

The photosensitive layer may contain a deterioration inhibitor such as an antioxidant or a light stabilizer for the purpose of improving the storage stability and durability.

In the photoreceptor having the single-layer structure shown in FIGS. 1 and 2, the carrier-generating substance used for the photosensitive layer 4 ″ is the titanyl phthalocyanine pigment according to the present invention.
The carrier transport material may be selected from those described above. Further, the binder resin of the photosensitive layer 4 ″ and other additives may be the same as those described above.

As the conductive support, a metal plate, a metal drum, or the like is used, and a conductive polymer or a conductive compound such as indium oxide, or a thin layer of a metal such as aluminum or palladium is applied, vapor-deposited, or laminated. What is provided on paper, a plastic film, or the like by such means as above is used.

The intermediate layer 5 functioning as an adhesive layer or a barrier layer is made of a polymer such as the above-described binder resin, polyvinyl alcohol, or the like.
An organic polymer substance such as ethyl cellulose, carboxymethyl cellulose, or polyamide, or a substance made of aluminum oxide or the like is used.

[0060]

The present invention will be described in more detail with reference to the following examples.

First, synthesis examples of various titanyl phthalocyanine pigments will be described.

(Synthesis Example 1) 29.2 g of 1,3-diiminoisoindoline and 200 ml of sulfolane were mixed, and 17.0 g of titanium tetraisopropoxide was added.
For 2 hours. After allowing to cool, the precipitate was collected by filtration, washed with chloroform, washed with a 2% aqueous hydrochloric acid solution, washed with water, and washed with methanol. After drying, 25.5 g (88.5%) of titanyl phthalocyanine was obtained. 100 g of the product was dissolved in 2 kg of concentrated sulfuric acid, poured into 20 liters of water, precipitated and collected by filtration to obtain an amorphous wet paste.

A mixed solvent of 200 ml of 1,2-dichloroethane and 100 ml of methanol was added to 2 g of the wet paste, and the mixture was stirred at room temperature for 3 hours. The crystals were diluted with methanol, filtered, washed with methanol, and dried to obtain crystals having an X-ray diffraction spectrum having peaks at Bragg angles 2θ of 9.5 ° ± 0.2 ° and 27.2 ° ± 0.2 °. The X-ray diffraction spectrum was measured using an X-ray diffractometer JDX-8200 (manufactured by JEOL Ltd.) under the following conditions (the same applies hereinafter).

X-ray tube Cu (Cu-Kα ray) Voltage 40.0 KV Current 100.0 mA Start angle 6.00 deg. Stop angle 35.00 deg. Step angle 0.020 deg. Measurement time 0.50 deg.

In the differential thermal analysis of this crystal, FIG.
Was obtained, and an endothermic peak was observed at 99.6 ° C. Differential thermal analysis followed the method described above (the same applies hereinafter).

(Synthesis Example 2) 29.2 g of 1,3-diiminoisoindoline and 200 ml of sulfolane were mixed, and 17.0 g of titanium tetraisopropoxide was added.
For 2 hours. After allowing to cool, the precipitate was collected by filtration, washed with chloroform, washed with a 2% aqueous hydrochloric acid solution, washed with water, and washed with methanol. After drying, 25.5 g (88.5%) of titanyl phthalocyanine was obtained.

Dissolve 100 g of the product in 2 kg of concentrated sulfuric acid and add
The mixture was poured into 1 liter of water, precipitated and collected by filtration to obtain an amorphous wet paste.

A mixed solvent of 200 ml of 1,2-dichloroethane and 100 ml of acetone was added to 2 g of the wet paste, and the mixture was stirred at room temperature for 3 hours. The mixture was diluted with methanol, filtered, washed with methanol and dried to obtain a Bragg angle of 2θ of 9.
Crystals having X-ray diffraction spectra having peaks at 5 ° ± 0.2 ° and 27.2 ° ± 0.2 ° were obtained. Further, in the differential thermal analysis of this crystal, a differential heat curve shown in FIG. 8 was obtained.

(Comparative Synthesis Example 1) After the wet paste of Synthesis Example 1 was dried and heated and stirred with α-chloronaphthalene, β-type titanyl phthalocyanine was obtained. X-ray diffraction spectrum is Bragg angle 2θ 9.3 ° ±
0.2 °, 10.6 ° ± 0.2 °, 13.2 ° ± 0.2 °, 15.1 ° ± 0.2
°, 15.7 ° ± 0.2 °, 16.1 ° ± 0.2 °, 20.8 ° ± 0.2 °, 2
It had peaks at 3.3 ° ± 0.2 °, 26.3 ° ± 0.2 °, and 27.1 ° ± 0.2 °. FIG. 9 shows a differential heat curve.

Each of the titanyl phthalocyanines obtained in the above Synthesis Examples 1 and 2 and Comparative Synthesis Example 1 was subjected to the component analysis of the adsorbed gas in a vacuum according to the above-mentioned method, and the following results were obtained.

Molecular number% H ₂ H ₂ O CONN ₂ O ₂ CO ₂ Synthesis Example 1 2.2 68.5 0.0 23.3 4.2 1.8 Synthesis Example 2 2.0 59.3 0.0 31.3 5.6 1.8 Comparative Synthesis Example 1 0.0 2.6 0.0 79.5 13.9 4.0 Synthesis Example 1, It can be seen that the titanyl phthalocyanine obtained in 2 contains the largest amount of water molecules.

(Synthesis Example 3) A mixed solvent of 1,2-dichloroethane (200 ml) and H ₂ O (50 ml) was added to titanyl phthalocyanine amorphous wet paste (2 g) in the same manner as in Synthesis Example 2, and the mixture was stirred at 60 ° C. for 4 hours. . Next, the mixture was diluted with methanol, filtered, washed with methanol and dried to obtain crystals.

(Synthesis Example 4) A wet paste of titanyl phthalocyanine in an amorphous state was washed with water and dried in the same manner as in Synthesis Example 2, and then 12 parts of titanyl phthalocyanine, 18 parts of sodium chloride and 8 parts of diethylene glycol were mixed.
Milling was performed for 60 hours with an automatic mortar under heating at ℃. Next, the treated product was washed with water and dried under reduced pressure, and then 20 parts of cyclohexanone and 2 parts of glass beads were added to 1 part of the dried product, and dispersed by a sand grinder for 1 hour. Thereafter, filtration and drying were performed to obtain crystals.

(Comparative Synthesis Example 2) In the same manner as in Synthesis Example 2, 200 ml of 1,2-dichloroethane and 100 m ₂ of H ₂ O were added to ₂ g of the wet paste of titanyl phthalocyanine in an amorphous state.
l of the mixed solvent was added, and the mixture was stirred at 80 ° C. for 4.5 hours. Next, the mixture was diluted with methanol, filtered, washed with methanol and dried to obtain crystals.

Each of the titanyl phthalocyanines obtained in Synthesis Examples 3 and 4 and Comparative Synthesis Example 2 was subjected to a component analysis of an adsorbed gas in a vacuum according to the above-described method from a photosensitive drum manufactured using the same. The following results were obtained.

H ₂ H ₂ O CONN ₂ O ₂ CO ₂ Synthesis Example 3 2.3 43.5 0.0 42.4 9.3 2.5 Synthesis Example 4 1.8 63.4 0.0 27.5 5.3 2.0 Comparative Synthesis Example 2 2.7 34.7 0.0 47.0 12.2 3.4

Example 1 3 parts (parts by weight; hereinafter the same) of a copolymerized polyamide "Lacamide 5003" (manufactured by Dainippon Ink and Chemicals Co., Ltd.) was dissolved in 100 parts of methanol by heating and dissolved in 0.6 part.
After filtration through an m filter, the mixture was applied on an aluminum drum by a permeation coating method to form an undercoat layer having a thickness of 0.5 μm.

On the other hand, 3 parts of the titanyl phthalocyanine according to the present invention obtained in Synthesis Example 1, 3 parts of a cellulose-modified silicone resin “KR5240” (manufactured by Shin-Etsu Chemical Co., Ltd.) as a binder resin, and 100 parts of methyl isobutyl ketone as a dispersion medium , A liquid dispersed using a sand mill, on the previous undercoat layer, applied by a permeation coating method, a film thickness of 0.2μm
Was formed. Then, 1 part of the exemplified carrier transporting substance I-4, 1.5 parts of a polycarbonate resin “Iupilon Z200” (manufactured by Mitsubishi Gas Chemical Co., Ltd.), and a small amount of silicone oil “KF-54” (manufactured by Shin-Etsu Chemical Co., Ltd.)
Using a solution dissolved in 10 parts of dichloroethane, the solution was permeated onto the carrier generating layer and dried, and then a carrier transporting layer having a thickness of 25 μm was formed to obtain a photoreceptor sample of the present invention.

Example 2 A photoreceptor sample was prepared in the same manner as in Example 1 except that the above-described carrier transporting substance II-2 was used instead of the carrier transporting substance I-4.

Example 3 A photoreceptor sample was prepared in the same manner as in Example 1 except that the above-described carrier transporting substance III-1 was used instead of the carrier transporting substance I-4.

Example 4 The procedure of Example 1 was repeated, except that the titanyl phthalocyanine of Synthesis Example 2 was used in place of the titanyl phthalocyanine of Synthesis Example 1 and the above-described carrier transporting substance I-6 was used in place of the carrier transporting substance I-4. In the same manner as in Example 1, a photoconductor sample was prepared.

Example 5 A photoreceptor sample was prepared in the same manner as in Example 4 except that the above-described carrier transporting substance II-3 was used instead of the carrier transporting substance I-6.

Example 6 A photoconductor sample was prepared in the same manner as in Example 1 except that the titanyl phthalocyanine of Synthesis Example 3 was used instead of the titanyl phthalocyanine of Synthesis Example 1.

Example 7 A photoconductor sample was prepared in the same manner as in Example 1 except that the titanyl phthalocyanine of Synthesis Example 4 was used instead of the titanyl phthalocyanine of Synthesis Example 1.

Comparative Example 1 A photoreceptor sample was prepared in the same manner as in Example 1 except that the titanyl phthalocyanine of Comparative Example 1 was used instead of the titanyl phthalocyanine of Synthetic Example 1.

Comparative Example 2 A photoconductor sample was prepared in the same manner as in Example 4 except that the titanyl phthalocyanine of Comparative Example 1 was used instead of the titanyl phthalocyanine of Synthetic Example 2.

Comparative Example 3 A photoconductor sample was prepared in the same manner as in Example 1 except that the following carrier transporting substance was used instead of the carrier transporting substance I-4.

[0088]

Embedded image

Comparative Example 4 A photoconductor sample was prepared in the same manner as in Example 1 except that titanyl phthalocyanine of Comparative Synthesis Example 2 was used instead of titanyl phthalocyanine of Synthesis Example 1.

[0090] (Evaluation) The samples and comparative samples of the present invention mounted on a "U-Bix1550" (manufactured by Konica Corp.) (laser light source mounting) modified machine, to adjust the grid voltage V _G to 600 [V], The potential V _H of the unexposed portion and the potential V _L of the exposed portion during irradiation of 0.7 mW were measured. In an environment of 33 ° C. and 80% RH, V _H and V _L were also measured after 50,000 prints, and the results are shown in Table 1 below.

[0091]

[Table 1]

From the above results, it can be seen that the photoreceptor of the present invention has high sensitivity and good stability by repeated use in a high temperature and high humidity environment. In contrast, the comparative photoreceptor has low sensitivity and remarkably inferior stability upon repeated use.

[0093]

As described in detail above, according to the electrophotographic photoreceptor of the present invention, the excellent effects of high sensitivity, less susceptibility to the external environment, and extremely good repeated use characteristics are obtained. Play.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a layer configuration of a photoconductor of the present invention.

FIG. 2 is a cross-sectional view illustrating a layer configuration of the photoconductor of the present invention.

FIG. 3 is a cross-sectional view illustrating a layer configuration of the photoconductor of the present invention.

FIG. 4 is a cross-sectional view illustrating a layer configuration of the photoconductor of the present invention.

FIG. 5 is a cross-sectional view illustrating the layer configuration of the photoconductor of the present invention.

FIG. 6 is a cross-sectional view illustrating a layer configuration of the photoconductor of the present invention.

FIG. 7 is a differential heat curve diagram of the phthalocyanine pigment according to the present invention.

FIG. 8 is a graph showing a differential heat curve of the phthalocyanine pigment according to the present invention.

FIG. 9 is a differential heat curve diagram of a β-type titanyl phthalocyanine pigment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conductive support 2 Carrier generation layer 3 Carrier transport layer 4, 4 ', 4 "Photosensitive layer 5 Intermediate layer

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-64-82042 (JP, A) JP-A-2-93471 (JP, A) JP-A-3-269064 (JP, A) (58) Survey Field (Int.Cl. ⁶ , DB name) G03G 5/06 370-373

Claims (2)

(57) [Claims] 1. In a component analysis of an adsorbed gas in a vacuum.
Titanylphthalo, which contains the largest number of water molecules in terms of number of molecules
A cyanine pigment represented by the following general formulas [I] to [III]
And at least one compound
Electrophotographic photoreceptor. Embedded image[Wherein, Ar₁, Ar_Two, Ar_ThreeAnd Ar_FourAre each
A nyl group or a naphthyl group;₁~ Ar_FourLess of
One of them is an amino group (including a substituted amino group) as a substituent.
No. ). n represents an integer of 0 or 1. ][Wherein, Ar_FiveAnd Ar₆Each represents an alkyl group or an ant
And represents Ar group _FiveAnd Ar₆And combine to form a ring
You may. R₁Is a hydrogen atom, an alkyl group, an alkoxy group
Or a halogen atom. ][Wherein, Ar₇And Ar₈Is a phenyl group or naph
Represents a tyl group, Ar ₉Represents a phenylene group, and B represents
Represents a benzyl group or a phenethyl group. ] 2. The electrophotographic photoreceptor according to claim 1, wherein the titanyl phthalocyanine pigment has an endothermic peak between 80 ° C. and 120 ° C. in differential thermal analysis.