JP2002131938A - Electrophotographic photoreceptor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the printing quality by increasing printing wear resistance by using a resin binder having both a high hardness and high transparency in an electric charge transferring layer and to provide an organic photoreceptor giving a good image. SOLUTION: The photoreceptor is a laminate type organic electrophotographic photoreceptor with a photosensitive layer 3 obtained by successively stacking an electric charge generating layer 4 and an electric charge transferring layer 5 on an electrically conductive substrate 1 directly or by way of an undercoat layer 2. A resin binder used in the electric charge transferring layer comprises a polysulfone resin of formula (1).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic photoreceptor (hereinafter, also simply referred to as "photoreceptor") used in an electrophotographic printer and copier, and more particularly, to charge transport comprising an organic material as a main component. The present invention relates to a photoconductor for electrophotography according to an improvement in a constituent material of a layer.

[0002]

2. Description of the Related Art An electrophotographic photosensitive member has a basic structure in which a photosensitive layer having a photoconductive function is laminated on a conductive substrate. In recent years, photoreceptors for organic electrophotography, which use organic compounds as functional components responsible for transport of charge generation, have been actively researched and developed due to the variety of materials, high productivity, safety, and other factors. Applications to printers and printers are being promoted.

A photoreceptor is required to have a function of retaining a surface charge in a dark place, a function of receiving light to generate a charge, and a function of transporting the generated charge. A so-called single-layer type photoreceptor with a single-layer photosensitive layer, a charge generation layer mainly responsible for charge generation during photoreception, and a function to maintain surface charge in the dark and charge generation during photoreception There is a so-called function-separated laminated type photoconductor including a photosensitive layer in which a layer having a function separation is laminated on a charge transport layer having a function of transporting charges generated in the layer.

Recently, an organic pigment is used as a charge generating material and dissolved in an organic solvent together with a resin binder.
A layer formed by applying the dispersed coating liquid to form a charge generation layer,
Function separation and lamination of a layer in which a low-molecular organic compound is used as a charge transport material, and a coating solution formed by dissolving and dispersing this in an organic solvent together with a resin binder into a film is formed as a charge transport layer, and these are laminated to form a photosensitive layer Electrophotographic photoconductors have become mainstream.

[0005]

However, at present, the required characteristics of the organic photoreceptor include not only stable print quality (black print density, resolution, gradation) at initial and after printing, but also It is also required that the amount of film loss due to printing durability be low. The stability of printing quality due to printing durability may depend on the chemical stability of the charge generation material and the charge transport material against a high electric field and light irradiation in the volume direction of the organic photoreceptor due to charging. When the amount of film reduction of the charge transport layer by the blade increases, the thickness of the charge transport layer decreases, and at the same time, deterioration of image quality due to fluctuations in charging and bright portion potential can be considered.

[0006] The resin binder for the charge transport layer currently mainly used is bisphenol-based polycarbonate. The molecular weight of the polycarbonate is increased and the hardness of the charge transport layer film is increased to reduce the amount of film loss. Is possible. However, in order to increase the hardness of the resin binder from such a viewpoint and to suppress the amount of film loss,
As a resin binder, those with a simply high glass transition temperature,
There are many types of high melting points and those that are soluble in the solvents commonly used for the charge transport layer coating solution.However, in actual use of the photoconductor, it is necessary to expose the charge transport layer from the surface side during charging. Light attenuation of the surface charge due to
High transparency is also required. However, polydiphenylsulfone resin and the like have high hardness but are opaque,
It does not accompany actual use as a photoconductor.

Therefore, an object of the present invention is to stabilize the printing quality by printing durability by using a resin binder having both high hardness and high transparency in the charge transport layer.
An object of the present invention is to provide an organic photoreceptor capable of obtaining a good image.

[0008]

Means for Solving the Problems From the standpoint of maintaining high hardness and improving transparency, the present inventors have focused on a structure obtained by adding a compound having a structure other than diphenyl sulfone to diphenyl sulfone. As a result of diligent studies that the above-mentioned object is achieved by a resin binder composed of a copolymer of diphenyl sulfone and a compound having a structure other than the diphenyl sulfone, the polysulfone resin binder having a specific structure successfully reduces the residual potential. It has been found that it is possible to reduce the amount of film loss during printing, and to complete the present invention.

That is, in the electrophotographic photoreceptor of the present invention, a charge generation layer and a charge transport layer are sequentially laminated on a conductive substrate via an undercoat layer or directly without an undercoat layer. In the photoreceptor for a layered organic electrophotography provided with the photosensitive layer formed by the above, the resin binder used for the charge transport layer is represented by the following general formula (1): (Wherein R ¹ and R ² may be the same or different,
A hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a cycloalkyl group or an aryl group which may have a substituent, or may form a cyclic structure together with a carbon atom to which they are bonded. And further, one or two arylene groups may be bonded to the cyclic structure.
^{3 to} R ¹⁰ may be the same or different and represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a fluorine atom, a chlorine atom or a bromine atom which is an electron-withdrawing group, and at least one of R ^{3 to} R ⁶ If either is a fluorine atom, a chlorine atom or a bromine atom which is an electron-withdrawing group, then both R ¹ and R ² will not be a hydrogen atom or an alkyl group). It is characterized by being done.

Further, another electrophotographic photoreceptor of the present invention comprises:
A laminated organic electrophotographic photosensitive material comprising a photosensitive layer formed by sequentially laminating a charge generation layer and a charge transport layer on a conductive substrate via an undercoat layer or directly without an undercoat layer. The resin binder used in the charge transport layer is represented by the following general formula (2): (Wherein R ¹ and R ² may be the same or different,
A hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a cycloalkyl group or an aryl group which may have a substituent, or may form a cyclic structure together with a carbon atom to which they are bonded. , And 1
Or two arylene groups may be bonded to each other;
^{3 to} R ¹⁰ may be the same or different and represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a fluorine atom, a chlorine atom or a bromine atom, n and m each represent a copolymerization ratio, and
(N + m) = 0.1-0.9).

Further, still another electrophotographic photoreceptor of the present invention comprises a charge generation layer and a charge transport layer formed on a conductive substrate through an undercoat layer or directly without an undercoat layer. Are laminated, the resin binder used for the charge transporting layer is represented by the following general formula (3): (In the formula, R ¹ , R ² , R ¹¹ and R ¹² may be the same or different, and represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a cycloalkyl group or aryl which may have a substituent. represents a group, or may form a cyclic structure together with the carbon atoms to which they are attached, and further may be bonded one or two arylene groups to cyclic structure, R ³ to R ¹⁰ and R ^{13 to} R ¹⁶ may be the same or different and include a hydrogen atom, an alkyl group having 1 to 8 carbon atoms,
Represents a fluorine atom, a chlorine atom or a bromine atom, p and q represent a copolymerization ratio, and p / (p + q) = 0.1 to 0.9
In the range of (1) to (4) above.

In the electrophotographic photoreceptor of the present invention, the polysulfone tree can be used alone or in combination.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing a preferred configuration example of the photoreceptor of the present invention, in which a charge generation layer 4 is provided on a conductive base 1 via an undercoat layer 2.
This is a negatively-charged function-separated laminated photoconductor having a photosensitive layer 3 in which a charge transport layer 5 is sequentially laminated.

The conductive substrate 1 serves as one electrode of the photoconductor and also serves as a support for each layer constituting the photoconductor, and may have any shape such as a cylindrical shape, a plate shape, and a film shape. The material may be a metal such as aluminum, stainless steel, nickel, or the like, or a material obtained by performing a conductive treatment on a surface of glass, resin, or the like.

The undercoat layer 2 is made of a layer mainly composed of a resin or a metal oxide film such as alumite. The undercoat layer 2 controls the injectability of electric charge from the conductive substrate to the photosensitive layer or covers defects on the surface of the substrate. It is provided as necessary for the purpose of improving the adhesiveness between the photosensitive layer and the base. Examples of the resin material used for the undercoat layer 2 include insulating polymers such as casein, polyvinyl alcohol, polyamide, melamine, and cellulose, and conductive polymers such as polythiophene, polypyrrole, and polyaniline. These resins may be used alone. ,
Alternatively, they can be used in appropriate combination and mixed. In addition, metal oxides such as titanium dioxide and zinc oxide can be contained in these resins.

The charge generation layer 4 is formed by vacuum-depositing an organic photoconductive material or applying a material in which particles of the organic photoconductive material are dispersed in a resin binder, and receiving light to form a charge. Has the function of generating In addition, the charge transport layer 5 of the charges generated simultaneously with the high charge generation efficiency.
It is important that the injection property is high, and it is desirable that injection be good even at a low electric field with little dependence on electric field. Examples of the organic photoconductive material (charge generation material) include the following specific examples (I-1) to (I-
Various phthalocyanine compounds shown in 6), (I-7) to
The azo compound represented by (I-24), (I-25) to (I-
The anthuanthrone compounds and their derivatives shown in 32) can be used.

[0017]

[0018]

[0019]

[0020]

[0021]

As the resin binder, polyester resin, polyvinyl acetate, polyacrylate, polymethacrylate, polyester, polycarbonate, polyvinyl acetoacetal, polyvinyl propional, polyvinyl butyral, phenoxy resin, epoxy resin, urethane resin, Cellulose esters, cellulose ethers and the like can be used in appropriate combination.

The ratio of the resin binder to the charge generating material is preferably 5 to 500 parts by weight, more preferably 1 to 500 parts by weight, based on 100 parts by weight of the resin binder.
0 to 100 parts by weight. In addition, since the charge transport layer 5 is laminated on the charge generation layer 4, the thickness thereof is determined by the light absorption coefficient of the charge generation material, and is generally 5 μm.
m or less, preferably 1 μm or less.

Next, the charge transport layer 5 is formed of the following general formulas (1), (2) and (3) together with the charge transport material.
It is important to constitute with a polysulfone resin binder represented by (Wherein R ¹ and R ² may be the same or different,
A hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a cycloalkyl group or an aryl group which may have a substituent, or may form a cyclic structure together with a carbon atom to which they are bonded. And further, one or two arylene groups may be bonded to the cyclic structure.
^{3 to} R ¹⁰ may be the same or different and represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a fluorine atom, a chlorine atom or a bromine atom which is an electron-withdrawing group, and at least one of R ^{3 to} R ⁶ Is a fluorine atom, a chlorine atom or a bromine atom which is an electron-withdrawing group, both R ¹ and R ² do not become a hydrogen atom or an alkyl group. ) (Wherein R ¹ and R ² may be the same or different,
A hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a cycloalkyl group or an aryl group which may have a substituent, or may form a cyclic structure together with a carbon atom to which they are bonded. , And 1
Or two arylene groups may be bonded to each other;
^{3 to} R ¹⁰ may be the same or different and represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a fluorine atom, a chlorine atom or a bromine atom, n and m each represent a copolymerization ratio, and
(N + m) = 0.1 to 0.9. ) (In the formula, R ¹ , R ² , R ¹¹ and R ¹² may be the same or different, and represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a cycloalkyl group or aryl which may have a substituent. represents a group, or may form a cyclic structure together with the carbon atoms to which they are attached, and further may be bonded one or two arylene groups to cyclic structure, R ³ to R ¹⁰ and R ^{13 to} R ¹⁶ may be the same or different and include a hydrogen atom, an alkyl group having 1 to 8 carbon atoms,
Represents a fluorine atom, a chlorine atom or a bromine atom, p and q represent a copolymerization ratio, and p / (p + q) = 0.1 to 0.9
In the range. )

The polysulfone represented by the general formula (1) can be obtained by polycondensation of a sodium salt of a bisphenol compound with a 4,4'-dichlorodiphenylsulfone compound. The polysulfone represented by the general formula (2) can be obtained by a phosgene method using a 4,4′-hydroxybisphenol-based compound and a 4,4′-dihydroxydiphenylsulfone-based compound.
Can be obtained by the same synthesis method as in the general formula (2).

In the following, exemplary compounds relating to the general formula (1) are represented by (1-1) to (1-36), and exemplary compounds relating to the general formula (2) are represented by (2-1) to (2-39). Illustrative compounds of the general formula (3) are represented by (3-1) to (3-25)
However, the present invention is not limited to these. In addition, such polysulfone resins can be used alone or in appropriate combination as a mixture.

[0027]

[0028]

[0029]

[0030]

[0031]

[0032]

[0033]

[0034]

[0035]

[0036]

[0037]

[0038]

[0039]

[0040]

As the charge transporting material, a hydrazone compound, a butadiene compound, a diamine compound, an indole compound, an indoline compound, a stilbene compound, a distilbene compound and the like can be used alone or in an appropriate combination. Specifically, it is a compound represented by the following (II-1) to (II-12).

[0042]

[0043]

The amount of the charge transporting material is preferably 4 to 20 parts by weight based on 100 parts by weight of the resin binder according to the present invention.
0 parts by weight, more preferably 60 to 150 parts by weight. The thickness of the charge transport layer 5 is preferably in the range of 3 to 50 μm, and more preferably 15 to 40 μm, in order to maintain a practically effective surface potential.

Further, an antioxidant, a light stabilizer and the like are added to the undercoat layer 2 and the charge transport layer 5 as required for the purpose of improving environmental resistance and stability against harmful light. be able to. Specifically, the following (III-
Examples of the compounds include 1) to (III-45).

[0046]

[0047]

[0048]

[0049]

[0050]

[0051]

Further, the photosensitive layer 3 may contain a leveling agent such as silicone oil or fluorine-based oil for the purpose of improving the leveling property of the formed film and imparting further lubricity.

[0053]

Embodiments of the present invention will be described below. Example 1 5 parts by weight of an alcohol-soluble nylon (“CM8000” manufactured by Toray Industries, Inc.) and 5 parts by weight of aminosilane-treated titanium oxide fine particles as an undercoat layer on the outer periphery of an aluminum cylinder as a conductive substrate were mixed with methanol. A coating solution prepared by dissolving and dispersing in 90 parts by weight was applied by dip coating and dried at a temperature of 100 ° C. for 30 minutes to form an undercoat layer having a thickness of about 3 μm.

On this undercoat layer, the following formula as a charge generating material Is prepared by dissolving and dispersing 1 part by weight of a metal-free phthalocyanine represented by the following formula and 1.5 parts by weight of a polyvinyl butyral resin (“Slek KS-1” manufactured by Sekisui Chemical Co., Ltd.) as a resin binder in 60 parts by weight of dichloromethane. The coating solution thus obtained was applied by dip coating and dried at a temperature of 80 ° C. for 30 minutes to form a charge generating layer having a thickness of about 0.3 μm.

On this charge generation layer, the following formula as a charge transporting material: And a coating solution prepared by dissolving 80 parts by weight of the stilbene compound represented by the formula (1) and 120 parts by weight of the polysulfone resin of the exemplified compound (1-1) as a resin binder in 900 parts by weight of dichloromethane. After drying for a minute, a charge transporting layer having a thickness of about 28 μm was formed, thereby producing a photoconductor for organic electrophotography.

Example 2 A photoconductor for organic electrophotography was prepared in the same manner as in Example 1 except that the exemplified compound (1-1) used in Example 1 was replaced with the exemplified compound (1-4). did.

Example 3 A photoconductor for organic electrophotography was prepared in the same manner as in Example 1 except that the exemplified compound (1-1) used in Example 1 was replaced with the exemplified compound (1-7). did.

Example 4 A photoconductor for organic electrophotography was prepared in the same manner as in Example 1, except that the exemplified compound (1-1) used in Example 1 was replaced with the exemplified compound (1-15). did.

Example 5 A photoconductor for organic electrophotography was prepared in the same manner as in Example 1, except that the exemplified compound (1-1) used in Example 1 was replaced with the exemplified compound (2-1). did.

Example 6 A photoconductor for organic electrophotography was prepared in the same manner as in Example 1 except that the exemplified compound (1-1) used in Example 1 was replaced with the exemplified compound (2-8). did.

Example 7 A photoconductor for organic electrophotography was prepared in the same manner as in Example 1, except that the exemplified compound (1-1) used in Example 1 was replaced with the exemplified compound (2-15). did.

Example 8 A photoconductor for organic electrophotography was prepared in the same manner as in Example 1, except that the exemplary compound (1-1) used in Example 1 was replaced with the exemplary compound (2-20). did.

Example 9 A photoconductor for organic electrophotography was prepared in the same manner as in Example 1 except that the exemplified compound (1-1) used in Example 1 was replaced with the exemplified compound (3-1). did.

Example 10 A photoconductor for organic electrophotography was prepared in the same manner as in Example 1 except that the exemplified compound (1-1) used in Example 1 was replaced with the exemplified compound (3-3). did.

Example 11 An organic electrophotographic photoreceptor was prepared in the same manner as in Example 1 except that the exemplified compound (1-1) used in Example 1 was replaced with the exemplified compound (3-13). did.

Example 12 Except that 120 parts by weight of Exemplified Compound (1-1) used in Example 1 were replaced by 60 parts by weight of Exemplified Compound (1-1) and 60 parts by weight of Exemplified Compound (2-1) Example 1
A photoconductor for organic electrophotography was prepared in the same manner as in the above.

Example 13 The charge transport material used in Example 1 was obtained by the following formula: A photoconductor for organic electrophotography was produced in the same manner as in Example 1, except that the diamine compound represented by the formula was used.

Example 14 A photoconductor for organic electrophotography was prepared in the same manner as in Example 13, except that the exemplified compound (1-1) used in Example 13 was replaced with the exemplified compound (1-4). did.

Example 15 A photoconductor for organic electrophotography was prepared in the same manner as in Example 13, except that the exemplified compound (1-1) used in Example 13 was replaced with the exemplified compound (1-7). did.

Example 16 A photoconductor for organic electrophotography was prepared in the same manner as in Example 13, except that the exemplified compound (1-1) used in Example 13 was replaced with the exemplified compound (1-15). did.

Example 17 A photoconductor for organic electrophotography was prepared in the same manner as in Example 13, except that Exemplified Compound (2-1) was used in place of Exemplified Compound (1-1) used in Example 13. did.

Example 18 A photoconductor for organic electrophotography was prepared in the same manner as in Example 13, except that the exemplified compound (1-1) used in Example 13 was replaced with the exemplified compound (2-8). did.

Example 19 A photoconductor for organic electrophotography was produced in the same manner as in Example 13, except that the exemplified compound (1-1) used in Example 13 was replaced with the exemplified compound (2-15). did.

Example 20 A photoconductor for organic electrophotography was prepared in the same manner as in Example 13, except that the exemplified compound (1-1) used in Example 13 was replaced with the exemplified compound (2-20). did.

Example 21 A photoconductor for organic electrophotography was prepared in the same manner as in Example 13, except that the exemplified compound (1-1) used in Example 13 was replaced with the exemplified compound (3-1). did.

Example 22 A photoconductor for organic electrophotography was prepared in the same manner as in Example 13, except that the exemplified compound (1-1) used in Example 13 was replaced with the exemplified compound (3-3). did.

Example 23 A photoconductor for organic electrophotography was prepared in the same manner as in Example 13, except that the exemplified compound (1-1) used in Example 13 was replaced with the exemplified compound (3-13). did.

Example 24 Except that 120 parts by weight of Exemplified Compound (1-1) used in Example 13 were replaced with 60 parts by weight of Exemplified Compound (1-1) and 60 parts by weight of Exemplified Compound (2-1) A photoconductor for organic electrophotography was produced in the same manner as in Example 13.

Comparative Example 1 The exemplified compound (1-1) used in Example 1 was converted to the following formula: A photoconductor for organic electrophotography was produced in the same manner as in Example 1, except that the bisphenol A polycarbonate represented by the following formula was used.

Comparative Example 2 The exemplified compound (1-1) used in Example 1 was converted to a compound represented by the following formula: A photoconductor for organic electrophotography was produced in the same manner as in Example 1 except that the bisphenol Z polycarbonate represented by the following formula was used.

Comparative Example 3 120 parts by weight of the exemplified compound (1-1) used in Example 1 was replaced with 60 parts by weight of bisphenol A polycarbonate used in Comparative Example 1 and 60 parts by weight of bisphenol Z polycarbonate used in Comparative Example 2. A photosensitive member for organic electrophotography was produced in the same manner as in Example 1 except for the above.

Comparative Example 4 Illustrative compound (1-1) used in Example 13 was prepared by the following formula: A photoconductor for organic electrophotography was prepared in the same manner as in Example 13, except that the bisphenol A polycarbonate represented by the following formula was used.

Comparative Example 5 The exemplified compound (1-1) used in Example 13 was converted into a compound represented by the following formula: A photoconductor for organic electrophotography was prepared in the same manner as in Example 13, except that the bisphenol Z polycarbonate shown by the following formula was used.

Comparative Example 6 120 parts by weight of the exemplified compound (1-1) used in Example 13 was replaced with 60 parts by weight of bisphenol A polycarbonate used in Comparative Example 1 and 60 parts by weight of bisphenol Z polycarbonate used in Comparative Example 2. A photoconductor for organic electrophotography was produced in the same manner as in Example 13 except for the above.

The resin binder for the charge transport layer used in all of the above Examples and Comparative Examples had a viscosity average molecular weight of about 2
The prepared charge transport layer coating solution was a coating solution having excellent transparency.

The above Examples 1 to 24 and Comparative Examples 1 to
The electrophotographic characteristics of the photosensitive drum prepared in 6 were evaluated by the following methods. First, after the photosensitive drum was charged to -650 V in a dark place, the potential holding ratio Vk5 after 5 seconds from the surface potential of the photosensitive drum whose rotation was stopped was determined. Subsequently, the photosensitive drum surface is continuously irradiated with the exposure light, and the charged potential becomes −600.
The sensitivity required to reach -300 V from V
The exposure amount required to reach -100 V from -600 V was determined as sensitivity E100, respectively. In the above sensitivity measurement, the total amount of light was 2.5 μJ / c.
The surface potential of the photosensitive drum immediately after irradiation with the exposure light of m ² was called residual potential Vr2.5, and this residual potential was determined.

Next, Examples 1 to 24 and Comparative Examples 1 to 6
, A printing durability test was performed. The printing durability tester was a digital copying machine, and the printing durability was 100K. In the evaluation method, the amount of film reduction was obtained by subtracting the film thickness after printing 100K sheets from the initial film thickness. Further, the film loss per 1K sheets was obtained as an average film loss by dividing the film loss by 100. The results obtained are shown in Tables 1 and 2 below.

[0088]

[Table 1]

[0089]

[Table 2]

According to the results shown in Table 1, the characteristics of the photosensitive members of Examples 1 to 12 were the same as those of Comparative Examples 1 to 3.
According to the results shown in Table 2, the same characteristics as those of Comparative Examples 3 to 6 were obtained for the photoconductor characteristics of Examples 13 to 24.
From these facts, it is understood that the use of the polysulfone resin binder according to the present invention in the charge transport layer does not affect the photoreceptor characteristics.

On the other hand, with respect to the amount of film reduction of the photoreceptor, from the results shown in Table 1, the amount of film reduction of the photoreceptors of Examples 1 to 12 is lower than that of Comparative Examples 1 to 3. Also,
From the results shown in Table 2, the film reduction amounts of the photoconductors of Examples 13 to 24 are also lower than those of Comparative Examples 3 to 6.
From these facts, it was confirmed that the use of the polysulfone resin binder according to the present invention in the charge transport layer reduced the amount of film reduction and achieved the intended purpose.

In addition to the photoreceptors for digital copying machines using phthalocyanine compounds shown in the above-described embodiments, analog copying machines, laser beam printers, etc.
The same effect was obtained in the photoreceptor for facsimile by the charge transport layer using the polysulfone resin binder according to the present invention. Further, with the polysulfone resin binder, the above-described effects can be obtained also in a positively charged single-layer organic photoconductor in which a photosensitive layer is provided on a conductive substrate.

[0093]

As described above, according to the present invention,
It is possible to provide a photoconductor for organic electrophotography in which the amount of film loss can be reduced while maintaining the electrophotographic properties of the photoconductor and 100K sheet printing durability can be obtained, as is clear from the evaluation results. Becomes

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a preferred configuration example of a photoconductor of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 conductive substrate 2 undercoat layer 3 photosensitive layer 4 charge generation layer 5 charge transport layer

Claims (4)

[Claims] 1. A lamination type comprising a photosensitive layer formed by sequentially laminating a charge generation layer and a charge transport layer on a conductive substrate through an undercoat layer or directly without an undercoat layer. In the photoreceptor for organic electrophotography, the resin binder used for the charge transport layer is represented by the following general formula (1): (Wherein R ¹ and R ² may be the same or different,
A hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a cycloalkyl group or an aryl group which may have a substituent, or may form a cyclic structure together with a carbon atom to which they are bonded. And further, one or two arylene groups may be bonded to the cyclic structure.
^{3 to} R ¹⁰ may be the same or different and represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a fluorine atom, a chlorine atom or a bromine atom which is an electron-withdrawing group, and at least one of R ^{3 to} R ⁶ When either is a fluorine atom, a chlorine atom or a bromine atom which is an electron-withdrawing group, both R ¹ and R ² will not be a hydrogen atom or an alkyl group). A photoconductor for electrophotography, wherein the photoconductor is formed by: 2. A laminate type comprising a photosensitive layer formed by sequentially laminating a charge generation layer and a charge transport layer on a conductive substrate via an undercoat layer or directly without an undercoat layer. In the organic electrophotographic photoreceptor, the resin binder used for the charge transport layer is represented by the following general formula (2): (Wherein R ¹ and R ² may be the same or different,
A hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a cycloalkyl group or an aryl group which may have a substituent, or may form a cyclic structure together with a carbon atom to which they are bonded. And 1
Or two arylene groups may be bonded to each other;
^{3 to} R ¹⁰ may be the same or different and represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a fluorine atom, a chlorine atom or a bromine atom, n and m each represent a copolymerization ratio, and
(N + m) in the range of 0.1 to 0.9). 3. A laminated type comprising a photosensitive layer formed by sequentially laminating a charge generation layer and a charge transport layer on a conductive substrate via an undercoat layer or directly without an undercoat layer. In the photoreceptor for organic electrophotography, the resin binder used for the charge transport layer is represented by the following general formula (3): (In the formula, R ¹ , R ² , R ¹¹ and R ¹² may be the same or different, and represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a cycloalkyl group or aryl which may have a substituent. represents a group, or may form a cyclic structure together with the carbon atoms to which they are attached, and further may be bonded one or two arylene groups to cyclic structure, R ³ to R ¹⁰ and R ^{13 to} R ¹⁶ may be the same or different and include a hydrogen atom, an alkyl group having 1 to 8 carbon atoms,
Represents a fluorine atom, a chlorine atom or a bromine atom, p and q represent a copolymerization ratio, and p / (p + q) = 0.1 to 0.9
(3) An electrophotographic photosensitive member comprising a polysulfone resin represented by the following formula: 4. The electrophotographic photoconductor according to claim 1, wherein the polysulfone resin is used alone or in combination.