JPH09166882A - Electrophotographic organic photoreceptor - Google Patents

Abstract

(57) Abstract: To provide an electrophotographic organic photoconductor capable of obtaining stable image quality with little variation in electric resistance of an intermediate layer against environmental changes from low temperature and low humidity to high temperature and high humidity. In an electrophotographic organic photoreceptor in which an organic photosensitive layer 3 is formed on a surface of a conductive substrate 1 via an intermediate layer 2, the intermediate layer is a copolymerized polyamide resin having an ether bond in the molecule, or A copolymerized polyamide resin having a heterocyclic ring such as a piperazine ring or an isophorone ring, an aliphatic ring such as a cyclohexyl ring or a biscyclohexyl ring is contained in the molecule, and the copolymerized polyamide resin is an amino resin, an epoxy resin, or an isocyanate. Crosslink with compound or phenolic resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated organic photoconductor, which has high sensitivity, does not cause print defects even after repeated use over a long period of time, and has stable print quality against changes in the operating environment. And a photoconductor having.

[0002]

2. Description of the Related Art Electrophotographic organic photoconductors used in electrophotographic application devices using the Carlson method, such as copiers, printers, and fax machines, have hitherto been made of inorganic light such as selenium, selenium alloy, zinc oxide, and cadmium sulfide. Many used conductive materials. Recently, pollution-free, film-forming property,
Development of a photoconductor using an organic photoconductive material is actively pursued by taking advantage of advantages such as lightness. Among them, the so-called function-separated type organic photoreceptor, in which the charge generation layer and the charge transport layer are separated, can significantly improve the sensitivity by forming each layer with a material optimal for each function,
In addition, there are many advantages such as a spectral sensitivity that can be set according to a desired wavelength of exposure light.

[0003] Most of the function-separated type organic photoreceptors currently in practical use have a charge generation layer and a charge transport layer laminated in this order on a conductive substrate. In such a photoreceptor, a charge generating agent is dispersed and dissolved in an organic solvent together with a binder to form a charge generating layer, which is then dried to form a charge generating layer, and then a charge transporting agent is dissolved in the organic solvent together with the binder. It is prepared by applying a coating solution and drying it to form a charge transport layer.

As described above, even if the charge generating layer and the charge transporting layer are laminated directly on the substrate, the basic performance as a photoreceptor can be obtained. However, the charge generation layer is generally as thin as 0.5 μm or less in order to rapidly inject charge carriers generated by absorbing light into the substrate and the charge transport layer. If so, film defects such as pinholes and film unevenness occur, which causes image defects such as black spots and density unevenness on the image. Further, since the charge injection preventive property between the substrate and the charge generation layer is not sufficient, holes injected from the substrate lower the charge retention rate of the photoconductor and cause the problem of background fog on a white paper.

It is known that an intermediate layer made of a resin is provided between the conductive substrate and the photosensitive layer in order to eliminate such unevenness in film formation of the charge generation layer and image defects due to hole injection from the substrate. There is. FIG. 1 is a sectional view of an example of an electrophotographic organic photoreceptor having an intermediate layer. On the surface of the conductive substrate 1, a photosensitive layer 3 in which an intermediate layer 2, a charge generation layer 31, and a charge transport layer 32 are laminated is formed.

As the resin used for the mid layer 2, solvent-soluble polyamide, polyvinyl alcohol, polyvinyl butyral, casein and the like are known. In some cases, the intermediate layer using these resins can sufficiently perform its function even with an extremely thin film, for example, a thin film having a thickness of 0.1 μm or less. However, for other purposes, that is, to cover surface defects and surface stains on the conductive substrate and to eliminate unevenness in film formation of the charge generation layer, a film thickness of 0.5 μm or more is required. Depending on the state of contamination, a film thickness of 1 μm or more is required.

However, when such a thick intermediate layer is formed, the property of injecting the carriers generated in the charge generation layer into the conductive substrate is deteriorated, and the residual potential increases after repeated use, resulting in a print density. Image defect such as deterioration of image quality occurs. In addition, the electrical characteristics fluctuate significantly in response to changes in the environment in which it is used. Particularly when used in a high-temperature, high-humidity environment, the electrical resistance fluctuates greatly due to the dissociation of the water absorbed by the intermediate layer, and ground fog appears on the blank image There is a problem that causes. Various conventional materials have been proposed as a material for the intermediate layer, which has a low electric resistance even as a layer having such a film thickness and whose electric resistance does not fluctuate much even when the surrounding environment changes. For example, regarding solvent-soluble polyamide resins, JP-A-2-193152 and JP-A-3-288 disclose that the chemical structure is specified.
No. 157, JP-A-4-31870, etc. are known, and JP-A-2-59458 and JP-A-2-59458 disclose that an additive is added to a polyamide resin to suppress a change in electric resistance with respect to the environment. 3-150572 and JP-A-2-53070 are known.
In addition, Japanese Patent Application Laid-Open No. Hei 3 (1999) -311 describes a method in which a polyamide resin and another resin are mixed to adjust the electric resistance to suppress the influence of the environment.
No. 145652, Japanese Patent Laid-Open No. 3-81778,
JP-A-2-281262 is known. However, since the main material used in these methods is a polyamide resin having high water absorption, it is difficult to sufficiently suppress the influence of temperature and humidity.

As other materials, examples using a cellulose derivative (JP-A-2-238459) and examples using polyether urethane (JP-A-2-11585).
No. 8, JP-A-2-280170), an example using polyvinylpyrrolidone (JP-A-2-105349), and an example using polyglycol ether (JP-A-2-28034).
79859) and the like, and in order to reduce the water absorption of the resin, a melamine resin (Japanese Patent Laid-Open No. 4-2
2966, JP-A-4-31576, JP-A-4-31577) and phenolic resin (JP-A-3-3153).
No. 48256), it is proposed to use a crosslinkable resin, but these methods are also effective when the resin layer is extremely thin, but when a relatively thick film of several μm or more is used, The resistance of the intermediate layer becomes extremely high, which causes an increase in residual potential.

[0009]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, and even if the thickness of the intermediate layer is increased, the electrical resistance of the intermediate layer is maintained even when the environment changes from low temperature low humidity to high temperature high humidity. It is an object of the present invention to provide an electrophotographic organic photoconductor in which the fluctuation of the image is small, the residual potential does not increase, and stable image quality can be obtained even when it is repeatedly used.

[0010]

In order to achieve the above object, the present invention provides an electrophotographic organic photoreceptor in which an organic photosensitive layer is formed on the surface of a conductive substrate via an intermediate layer. The layer shall contain a copolyamide resin having an ether bond in the molecule. Further, in the electrophotographic organic photoreceptor in which the organic photosensitive layer is formed on the surface of the conductive substrate via the intermediate layer, the intermediate layer contains a copolymerized polyamide resin having a heterocycle or an aliphatic ring in the molecule. I shall.

The heterocycle is preferably a piperazine ring, and the aliphatic ring is preferably an isophorone ring, a cyclohexyl ring or a biscyclohexyl ring. The copolyamide resin is preferably crosslinked with an amino resin, an epoxy resin, an isocyanate compound or a phenol resin.

Polyamide resin has an amide bond represented by --CO--NH-- and is a resin having high water absorption,
The electric resistance decreases due to the ionic conduction of the adsorbed water.
Furthermore, since the water absorption changes depending on the environment, the electric resistance also changes. However, in the polyamide resin having an ether bond, the introduced ether bond increases the flexibility of the polymer in the solvent (weaks the entanglement of the polymer). After that, when dried, it becomes harder (tighter) than without ether bond,
Moisture once taken into the molecule is less likely to come out, and the presence of the water makes it less likely that moisture will enter from the outside. Therefore, fluctuations in electric resistance are reduced. When a heterocycle or an aliphatic ring is introduced, it becomes hard due to their bulkiness, and when a cross-linking agent is mixed, the polyamide resin is cross-linked and becomes hard. Similarly, fluctuations in electric resistance are reduced.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention can provide a photoreceptor which solves the above-mentioned problems by forming an intermediate layer provided on a conductive substrate with a polyamide resin having a specific structure. The polyamide resin used in the present invention is a polyamide resin soluble in water or an alcohol solvent such as methanol, ethanol or isopropanol, or a mixed solvent of alcohol and a chlorine solvent such as dichloromethane or trichlene.

The polyamide resin used in the present invention is reduced in crystallinity and solubility by selecting a monomer used for copolymerization and adjusting a polymerization ratio thereof, or by introducing a side chain into an amide bond. It is a polyamide resin having improved Specifically, a polyamide having an ether bond in the molecule, a polyamide having a heterocyclic ring such as a piperazine ring or a furan ring introduced into the molecule, or an aliphatic ring such as an isophorone ring, a cyclohexyl ring or a biscyclohexyl ring introduced into the molecule. Examples include polyamides.

The polyamide having an ether bond in the molecule is, for example, a dicarboxylic acid having an ether bond,
A polyamide synthesized by an ordinary method using at least one kind of diamine or cyclic amide as a raw material can be mentioned. Preferred examples of this type of soluble polyamide include a copolymerized polyamide (P) comprising a repeating unit A represented by the following general formula (1) and a repeating unit B represented by the following general formula (2).

[0016]

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(R represents an alkylene group having 2 to 4 carbon atoms and is composed of repeating units of d = 1 to 100) In this polymerization, polyalkylene glycol is cyanoethylated and then hydrogenated to form a diamine, It is obtained by reacting a polyamide salt of this diamine and adipic acid with caprolactam.

Examples of the alkylene glycol include ethylene glycol, propylene glycol and butylene glycol, with ethylene glycol being preferred. The degree of polymerization of polyalkylene glycol is preferably 5 to 100, more preferably 10 to 50. The copolymerization ratio, that is, the proportion of repeating units of A and B is preferably 50 parts by weight or less, more preferably 10 parts by weight or less, per 100 parts by weight of A unit. It is also possible to use a homopolyamide consisting only of A units.

As the above-mentioned copolymerized polyamide (P),
Those having a relative viscosity of 2 to 3 (measured in 100 ml of 98% sulfuric acid with 1 g of polyamide) are preferably used. Examples of the multi-component copolymerized polyamide having a heterocycle introduced therein include a repeating unit C represented by the following general formula (3) and a general formula (4).
The copolymerized polyamide (Q) composed of the repeating unit D represented by

[0020]

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The copolymer polyamide (Q) can be obtained by polymerizing a polyamide raw material in which caprolactam is allowed to coexist in a polyamide salt composed of 2-aminoethylpiperazine and adipic acid. The copolymerization ratio of C and D is preferably 4 D units per 100 parts by weight of C units.
The proportion is 3 parts by weight or less. The relative viscosity of this is preferably in the same range as the above-mentioned copolymerized polyamide (P).

The multi-component copolymerized polyamide having an aliphatic ring introduced therein has a repeating unit E represented by the following general formula (5).
And a copolyamide (R) composed of the repeating unit F represented by the general formula (6).

[0023]

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The copolyamide (R) is obtained by polymerizing a polyamide raw material in which caprolactam is allowed to coexist in a polyamide salt composed of isophoronediamine and adipic acid. The above-mentioned copolyamide (P),
The intermediate layer using (Q) and (R) can be used without any additive such as a crosslinking agent, but the chemical resistance of the intermediate layer is required depending on the solvent of the charge generating layer to be laminated. There is a case. In that case, it is preferable to cure the polyamide with a crosslinking agent. As a method for crosslinking, after adding a crosslinking agent to a polyamide solution and coating and drying, 100 ° C to 2
It can be crosslinked by heat treatment at 00 ° C. The crosslinking agent used is not particularly limited,
Amino resins (urea resins, melamine resins, benzoguanamine resins), epoxy resins, phenol resins, block isocyanate resins and the like are preferable.

Examples of the method of applying the soluble polyamide of the present invention to the conductive substrate include a method of applying a dilute solution of soluble polyamide dissolved in a solvent. As a coating method, known methods such as a dipping method, a doctor blade method, a bar coater method, a roll transfer method, and a spray method are used, and the dipping method is particularly preferable for coating on a cylindrical conductive substrate.

Preparation of a dilute solution of soluble polyamide is not particularly limited as long as it is a solvent capable of dissolving polyamide.
Particularly preferred solvents include water, alcohol, or a mixed solvent of water / alcohol solvent, or a mixed solvent of alcohol / chlorine solvent. In the conductive substrate of the present invention, JIS3003 series, JIS5000 series,
Aluminum alloys such as JIS6000 series, other metals, conductive resins, etc. can be applied.

These conductive substrates are finished to a predetermined dimensional accuracy by extruding or drawing aluminum or by injection molding a resin. If necessary, the surface of this conductive substrate is cut with a diamond bite or the like to have an appropriate surface roughness. Alternatively, it is possible not to perform cutting for cost reduction.
Then, the conductive substrate is washed in order to remove the cutting oil used for the surface processing and obtain a clean conductive substrate surface. As a detergent, a water-based detergent such as a weak alkaline detergent is used instead of a conventional chlorine-based organic solvent such as trichlene and freon.

In the photoreceptor of the present invention, the charge generation layer is formed on the intermediate layer. The charge generation material is not particularly limited as long as it is a material having photosensitivity to the wavelength of the light source, and examples thereof include a phthalocyanine pigment, an azo pigment, a quinacridone pigment, an indigo pigment, a perylene pigment, and a polycyclic quinone pigment. Organic pigment conductive materials such as anthanthrone pigment and benzimidazole pigment can be used, and these materials are used for various binder resins such as polyester resin, polyvinyl acetate, polymethacrylic acid ester resin, polycarbonate resin, polyvinyl butyral resin, and phenoxy resin. Used by being dispersed or dissolved. In this case, the mixing ratio is 30 to 500 parts by weight with respect to 100 parts by weight of the binder resin, and the film thickness is usually preferably 0.15 to 0.6 μm.

As the charge transport layer, for example, an enamine compound, a styryl compound, an amine compound, a butadiene compound or the like is used.
A solution is applied together with polyester resin, polycarbonate resin, polymethacrylate ester resin, polystyrene resin, etc., and a dry film thickness of 10 to 40 μm is applied. Further, if necessary, an antioxidant, a UV absorber, a leveling agent, etc. can be added.

[0030]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. Example 1 100 parts by weight of a copolymer of a diamine and an adipic acid salt having a structure represented by the following formula (7) obtained by cyanoethylating polyethylene glycol having an average degree of polymerization of 13 and reducing it and 42 parts by weight of caprolactam The mixed raw material was subjected to copolycondensation to obtain a copolyamide (P1) having a relative viscosity of 2.18. As a result of NMR analysis of this copolyamide (P1), it was found to have a structure represented by the following formula (8).

[0031]

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10 parts by weight of this copolyamide (P1) was dissolved in 90 parts by weight of a solvent in which methanol and dichloromethane were mixed at a ratio of 1: 1 (wt ratio), and dip-coated on an aluminum cylindrical substrate having an outer diameter of 30 mmφ. After that, 120 ℃
And dried for 30 minutes to form an intermediate layer having a film thickness of 5 μm.
Next, 2 parts by weight of X-type metal-free phthalocyanine, 96 parts by weight of tetrahydrofuran (THF), and 98 parts by weight of a solution prepared by dissolving 2 parts by weight of polyvinyl butyral resin were mixed on the above-mentioned intermediate layer, and dispersed by a ball mill treatment for 30 hours. Thereafter, the intermediate layer was applied by dipping coating and dried at 100 ° C. for 10 minutes to form a charge generation layer having a thickness of 0.2 μm.

Next, 10 parts by weight of a hydrazone compound (CTC191 manufactured by Anan Fragrance Co., Ltd.) and 10 parts by weight of a polycarbonate (L-1225, Teijin Chemicals Co., Ltd.) were uniformly dissolved in 80 parts by weight of dichloromethane. After coating on the charge generation layer by the same method, it was dried at 100 ° C. for 30 minutes to form a charge transport layer having a film thickness of 20 μm to prepare a photoreceptor. Example 2 Instead of the copolyamide (P1) used in Example 1,
Copolyamide (Q1) having a relative viscosity of 2.5, obtained by polycondensing a mixed raw material of 100 parts by weight of 2-aminoethylpiperazine adipate and 11 parts by weight of caprolactam.
A photoconductor was prepared in the same manner as in Example 1 except that was used as the intermediate layer.

The copolyamide obtained by this method (Q
As a result of NMR analysis of 1), the copolymerization ratio was 100: 11.
It was found that the structure was represented by the following formula (9) (weight ratio).

[0035]

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Example 3 Instead of the copolyamide (P1) used in Example 1,
Same as Example 1 except that a copolymerized polyamide (R1) having a relative viscosity of 2.0 obtained by polycondensing a mixed raw material of 100 parts by weight of adipate of isophoronediamine and 11 parts by weight of caprolactam is used for the intermediate layer. A photoconductor was prepared by the method.

The copolymerized polyamide (R
As a result of NMR analysis of 1), the copolymerization ratio was 100: 11.
It was found that the structure was represented by the following formula (10) (weight ratio).

[0038]

[Chemical 6]

Example 4 Instead of the copolyamide (P1) used in Example 1,
A copolymerized polyamide (R2) having a relative viscosity of 1.8 obtained by polycondensing a mixed raw material of 100 parts by weight of an adipate salt of 1,3-bis (aminomethyl) cyclohexanone and 11 parts by weight of caprolactam is used for the intermediate layer. A photosensitive member was manufactured in the same manner as in Example 1 except for the above.

The copolymerized polyamide (R
As a result of NMR analysis of 2), the copolymerization ratio was 100: 11.
It was found that the structure was represented by the following formula (11) (weight ratio).

[0041]

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Example 5 Instead of the copolyamide (P1) used in Example 1,
Copolyamide (R3) having a relative viscosity of 2.4 obtained by polycondensing a mixed raw material of 70 parts by weight of adipic acid salt of 4,4-diaminodicyclohexylmethane and 30 parts by weight of caprolactam is used for the intermediate layer. A photoconductor was prepared in the same manner as in Example 1.

The copolymerized polyamide (R
As a result of NMR analysis of 3), it was found that the structure was represented by the following formula (12) with a copolymerization ratio of 70:30 (weight ratio).

[0044]

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Example 6 8 parts by weight of the copolyamide (P1) obtained in Example 1 and 2 parts by weight of a melamine resin (Uban 2020 manufactured by Mitsui Toatsu Chemicals, Inc.) as a cross-linking agent were added with 1 part of methanol and dichloromethane. It was dissolved in 90 parts by weight of a solvent mixed with 1: 1 (wt ratio), and dip-coated on an aluminum cylindrical substrate having an outer diameter of 30 mmφ. Then, it is dried at 120 ° C. for 30 minutes, and the film thickness becomes 5
A μm intermediate layer was formed.

Further, a charge generating layer and a charge transporting layer were formed on the intermediate layer in the same manner as in Example 1 to prepare a photoreceptor. Example 7 A photoconductor was produced in the same manner as in Example 6 except that the copolyamide (P1) was replaced with the copolyamide (Q1) obtained in Example 2. Example 8 A photoconductor was produced in the same manner as in Example 6 except that the copolyamide (P1) was replaced with the copolyamide (R1) obtained in Example 3. Example 9 A photoconductor was produced in the same manner as in Example 6 except that the copolyamide (P1) was replaced with the copolyamide (R2) obtained in Example 4. Example 10 A photoconductor was produced in the same manner as in Example 6 except that the copolyamide (P1) was replaced with the copolyamide (R3) obtained in Example 5. Example 11 8 parts by weight of the copolyamide (P1) obtained in Example 1 and 2 parts by weight of an epoxy resin (Araldite AER2662 manufactured by Asahi Ciba Co., Ltd.) as a cross-linking agent were mixed with methanol and dichloromethane at a ratio of 1: 1 (wt ratio). ) Was dissolved in 90 parts by weight of the solvent, and dip-coated on an aluminum cylindrical substrate having an outer diameter of 30 mmφ. Then, it was dried at 120 ° C. for 30 minutes to form an intermediate layer having a film thickness of 5 μm.

Further, in the same manner as in Example 1, a charge generating layer and a charge transporting layer were formed on the intermediate layer to prepare a photoconductor. Example 12 A photoconductor was produced in the same manner as in Example 6 except that the copolyamide (P1) was replaced with the copolyamide (Q1) obtained in Example 2. Example 13 A photoconductor was produced in the same manner as in Example 6 except that the copolyamide (P1) was replaced with the copolyamide (R1) obtained in Example 3. Example 14 A photoconductor was produced in the same manner as in Example 6 except that the copolyamide (P1) was replaced with the copolyamide (R2) obtained in Example 4. Example 15 A photoconductor was produced in the same manner as in Example 6 except that the copolyamide (P1) was replaced with the copolyamide (R3) obtained in Example 5. Comparative Example 1 Instead of the copolyamide used in Examples 1 to 15, alcohol-soluble polyamide (manufactured by Toray Industries, Inc .: Amilan CM80) was used.
A photoconductor was prepared in the same manner as in Example 1 except that (00) was used. Comparative Example 2 The alcohol-soluble polyamide of Comparative Example 1 was converted to methoxymethylated polyamide (manufactured by Teikoku Chemical Industry Co., Ltd .: Toresin MF).
A photoconductor was prepared in the same manner as in Comparative Example 1 except that the above method was used instead of 30).

The photoconductor prepared as described above is mounted on a laser beam printer, and is placed in a room temperature and normal humidity environment of 25 ° C. and 50% RH, in a low temperature and low humidity environment of 10 ° C. and 25% RH, and 3
A printing test was performed under a high temperature and high humidity environment of 0 ° C. and 90% RH, and the printing quality was examined at the initial stage and after continuous printing of 50,000 sheets. The density of all-black printing (solid black in the table) was measured with a Macbeth densitometer. Table 1 shows the printing test results under the normal temperature and normal humidity environment, Table 2 under the low temperature and low humidity environment, and Table 3 under the high temperature and high humidity environment.

[0049]

[Table 1]

[0050]

[Table 2]

[0051]

[Table 3]

In Comparative Examples 1 and 2, the black solid density was 0.1 to 0.2 after continuous printing of 50,000 sheets under low temperature and low humidity and normal temperature and normal humidity environment.
In the high temperature and high humidity environment, ground fog occurred from the beginning. On the other hand, the photoconductors of Examples 1 to 15 have good image quality without the occurrence of black spots and a decrease in print density under the environment of low temperature and low humidity, normal temperature and normal humidity, and high temperature and high humidity, and have image defects even when repeatedly used. Did not occur.

[0053]

According to the present invention, in an electrophotographic organic photoreceptor in which an organic photosensitive layer is formed on the surface of a conductive substrate via an intermediate layer, the intermediate layer is a copolymer having an ether bond in the molecule. A polyamide resin or a copolymerized polyamide resin having a heterocycle such as a piperazine ring or an isophorone ring in the molecule, an aliphatic ring such as a cyclohexyl ring or a biscyclohexyl ring, and further the copolymerized polyamide resin is an amino resin, Since it is cross-linked by epoxy resin, isocyanate compound or phenol resin, the polyamide resin becomes hard by these additives or mixture, the ingress and egress of moisture is suppressed, and the residual potential is increased even if the thickness of the intermediate layer is increased to about 5 μm. Change in the electrical resistance of the intermediate layer in response to environmental changes from low temperature low humidity to high temperature high humidity Is small. Therefore, even under the environment of low temperature and low humidity to high temperature and high humidity, it is possible to always obtain stable and high image quality even when printing a large number of sheets.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an example of an electrophotographic organic photoreceptor having an intermediate layer.

[Explanation of symbols]

 1 Conductive Substrate 2 Intermediate Layer 3 Photosensitive Layer 31 Charge Generation Layer 32 Charge Transport Layer

Claims (5)

[Claims] 1. An electrophotographic organic photoreceptor in which an organic photosensitive layer is formed on the surface of a conductive substrate via an intermediate layer, wherein the intermediate layer contains a copolymerized polyamide resin having an ether bond in the molecule. An electrophotographic organic photoreceptor characterized by: 2. An electrophotographic organic photoreceptor in which an organic photosensitive layer is formed on the surface of a conductive substrate via an intermediate layer, wherein the intermediate layer has a copolyamide resin having a heterocycle or an aliphatic ring in the molecule. An electrophotographic organophotoreceptor containing: 3. The electrophotographic organic photoreceptor according to claim 2, wherein the heterocycle is a piperazine ring. 4. The electrophotographic organic photoreceptor according to claim 2, wherein the aliphatic ring is an isophorone ring, a cyclohexyl ring or a biscyclohexyl ring. 5. The copolyamide resin is an amino resin,
The electrophotographic organic photoreceptor according to any one of claims 1 to 4, which is crosslinked with an epoxy resin, an isocyanate compound or a phenol resin.