JP2852464B2 - Electrophotographic photoreceptor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electrophotographic photosensitive member, and more particularly, to an electrophotographic photosensitive member containing a photoconductive polymer compound as a carrier transporting substance.

[Prior Art] Conventionally, selenium, zinc oxide,
Inorganic photoreceptors having a photosensitive layer containing an inorganic photoconductive compound such as cadmium sulfide or silicon as a main component have been widely used. However, these are not always satisfactory in sensitivity, thermal stability, moisture resistance, durability and the like. For example, when selenium is crystallized, its characteristics as a photoreceptor are deteriorated, so that it is difficult to manufacture, and selenium is crystallized due to heat, fingerprints and the like, and the performance as a photoreceptor is deteriorated.
Cadmium sulfide has a problem in moisture resistance and durability, and zinc oxide has a problem in durability and the like.

In recent years, research and development of organic photoconductors having a photosensitive layer containing various organic photoconductive compounds as main components have been actively conducted in order to overcome the disadvantages of the inorganic photoconductors.

Such organic photoreceptors can be incinerated and have no pollution, and many of them can be formed into a thin film by coating and are easily mass-produced. Therefore, it has the advantages that the cost can be greatly reduced and that it can be processed into various shapes depending on the application. However, the sensitivity and durability of the organic photoreceptor still have problems, and the appearance of an organic photoreceptor having high sensitivity and high durability has been strongly desired. In order to improve such a point, an attempt has been made to develop a higher performance organic photoreceptor by assigning a carrier generation function and a carrier transport function to different substances, respectively. There are two types of photoreceptors of such a so-called function-separated type, a single-layer type and a laminated type. Both types can select a material from a wide range, and compare photoreceptors having arbitrary performance. Much research has been done because they can be easily created. In such a function-separated type photoreceptor, in particular, a stacked type photoreceptor, the carrier transporting material used in the carrier transporting layer has a high charge injection efficiency from the carrier generating layer, and further has a charge mobility in the carrier transporting layer. Needs to be selected. For this purpose, a compound having a small ionization potential and a compound in which a radical cation is easily generated are selected.
No. 260), hydrazone derivatives (JP-A-57-101844), oxadiazole derivatives (JP-B-34-5466), pyrazoline derivatives (JP-B-52-4188), and stilbene derivatives (JP-A-52-4188). Low molecular weight compounds such as 58-198043) and triphenylmethane derivatives (Japanese Patent Publication No. 45-555) have been conventionally used.

Such carrier transport layers often include such low molecular weight compounds dispersed or dissolved in a polymeric film forming binder such as polycarbonate, polyester, and the like. Generally, the polymeric film-forming binder in the transport layer is itself electrically inactive and becomes electrically active when it contains a carrier transport material.

[Problems to be Solved by the Invention] However, the addition of the low-molecular compound as described above significantly lowers the glass transition temperature of the polymer system, and causes mechanical damage such as damage to the photosensitive layer and deformation of the photosensitive member itself in various electrophotographic processes. Not only does this cause a decrease in strength, but when the amount of the low-molecular compound is increased for the purpose of improving the charge transport performance, precipitation of the low-molecular compound by crystallization in the polymer, phase separation, etc. are caused. As a result, there is a problem that the mechanical strength and sensitivity of the photoreceptor are further reduced.

Accordingly, it is an object of the present invention to provide an electrophotographic photoreceptor having excellent mechanical strength and photoconductivity without crystal precipitation or phase separation.

[Means for Solving the Problems] In view of the above problems, the present inventors have conducted intensive studies and as a result, have found that the above object of the present invention is at least one of the following structural units (I), (II) and (III) It has been found that this is achieved by providing an electrophotographic photosensitive member containing a polymer compound having at least one repeating unit containing

[Wherein, R ₁ , R ₂ , R ₃ , R ₄ and R ₅ each represent an alkyl group or an alkoxy group, and n ₁ and n ₃ each represent an integer of 1 to 5,
n ₂ , n ₄ and n ₅ each represent an integer of 1 to 4. Further, l, m and p each represent a number greater than 0 and 1 or less. Hereinafter, the present invention will be described in further detail.

The polymer compound having at least one repeating unit containing at least one of the structural units used in the present invention (hereinafter, referred to as the polymer compound of the present invention) may be a homopolymer composed of a single repeating unit, Structural unit (I)
A copolymer containing at least one of (III) to (III) and comprising two or more kinds of repeating units different from each other can also be preferably included. Furthermore, copolymers of these repeating units and other polymerizable monomers are also included. These include those having a two-dimensional or three-dimensional network structure.

As the polymer compound of the present invention, those containing the structural unit (II) are preferably used.

In the polymer compound of the present invention, the above structural units (I) to (I)
It is preferable that at least one of (III) is contained in 50 to 100 mol%.

Further, the polymer compound of the present invention preferably has a number average molecular weight of 3,000 to 3,000,000, and more preferably 10,000 to 1,000,000, in terms of molecular weight.

In the present invention, in each of the structural units (I) to (III), any of the three phenyl groups bonded to the N atom can have any of the substituents R _{1 to} R ₅ . Examples of such a substituent include an alkyl group such as a methyl group and an alkoxy group such as a methoxy group. Also, n ₁ R ₁ ,
n ₂ R ₂ , n ₃ R ₃ , n ₄ R ₄ and n ₅ R ₅ may be the same or different.

The polymer compound of the present invention further includes a copolymer with another polymerizable monomer as described above. Examples of such a polymerizable monomer include methyl methacrylate, ethyl methacrylate, and butyl methacrylate. Examples include methacrylate monomers, acrylate monomers such as methyl acrylate and butyl acrylate, styrene monomers, and acrylonitrile.

As the polymer compound of the present invention, those containing the structural unit (I) and methyl methacrylate preferably in a ratio of 1: 1 are preferably used.

 Hereinafter, specific examples of the polymer compound of the present invention will be described.

The synthesis examples of the polymer compound of the present invention are described below, but other polymer compounds of the present invention can also be synthesized according to these synthesis examples.

Synthesis Example 1: Synthesis of Polymer Compound (2-1) of the Present Invention 2-hydroxytriphenylamine (2 g, 7.7 mmol) was placed in a 100 ml four-necked flask, and 40 ml of dehydrated DMF was added and dissolved. 0.37 g (7.7 mmol) of sodium hydride was added and the mixture was stirred until there was no solid matter. Transfer the reaction vessel to an ice bath and cool to 5 ° C.
1.18 g (7.7 mmol) were added dropwise. After reacting at 5 ° C. for 2 hours, the reaction was carried out at room temperature overnight. The reaction solution was poured into 200 ml of deionized water and extracted with toluene. The toluene solution was washed with ion-exchanged water until the aqueous layer became neutral. The reddish brown oily substance obtained by removing toluene under reduced pressure was dissolved in a mixed solvent of toluene / hexane = 2/1 and purified using silica gel. Removal of the solvent gave a yellow oil. (2 g, 70% yield) Polymerization of methylstyryl 4- (N, N-diphenylamino) -phenyl ether 11.72 g (0.031 mol), methyl methacrylate 3.11 g (0.031 mol), AIBN 0.31 g (0.0019 mol) The mixture was placed in an ampoule for use, adjusted to 50 ml with toluene, degassed, and sealed. Polymerization was performed at a polymerization temperature of 60 ° C. and a reaction time of 2 hours. Immediately after the polymerization was completed, the ampoule was cooled in cold water, opened, added with chloroform, and added dropwise to a 20-fold amount of methanol. Reprecipitation was performed twice to obtain the desired product. (Dry weight
(3.1 g, yield: 20.9%) The proportion of triphenylamine in the obtained polymer was 75% by weight. The molecular weight was 1 × 10 ⁵ .

Synthesis Example 2: Synthesis of polymer compound (3-1) of the present invention 10 g of 4,4'-dihydroxytriphenylamine (0.036
Mol) dissolved in 300 ml of DMSO and sodium hydride (50%
(Mmol) was added and stirred. The reaction vessel was cooled to 5% and chloromethylstyrene 11.95 g (0.079 mol)
Was added dropwise. After reacting at 5 ° C. for 2 hours, the reaction was carried out at room temperature overnight. The reaction solution was poured into 200 ml of deionized water, and the oil was extracted with toluene. The reddish-brown oil component obtained by removing toluene was purified using a toluene / hexane = 2/1 solvent to obtain a target monomer. (Yield 12.8 g, 70% yield) Bis {(methylstyryl) 4- (N, N-diphenylamino)} phenyl ether 10 g (0.02 mol), AIBN 0.2 g
(0.0012 mol) was placed in an ampoule, made up to 50 ml with toluene, degassed, and sealed.

Polymerization was carried out in the same manner as in Synthesis Example 1 to obtain the desired product.
(Yield 2.0 g, yield 20%) The ratio of triphenylamine in the obtained polymer was 47.7% by weight, and the molecular weight was 2 × 10 ⁵ .

Synthesis Example 3: Synthesis of polymer compound (5-1) of the present invention 5 g of 4,4 ', 4 "-trihydroxytriphenylamine was added to 1 g of
The flask was placed in a 00 ml four-necked flask, and 40 ml of dehydrated DMF was added to dissolve. 1.47 g of sodium hydride was added and stirred. After cooling to 5 ° C., 9.37 g of chloromethylstyrene was added and reacted for 2 hours, and then reacted overnight at room temperature.

The reaction solution was poured into 200 ml of ion-exchanged water and extracted with toluene. The toluene solution was washed with water, and then the toluene was removed. The oily substance was purified to obtain the desired monomer.
(Yield: 60%) 5 g of the obtained monomer and 3.05 g of AIBN were dissolved in a toluene solution and reacted at 100 ° C. The obtained polymer was further dissolved in toluene, 0.92 g of AIBN was added, and the solution was applied on a substrate on which dibromoanthanelone (2Y) was deposited on an Al substrate, and reacted at 90 ° C. to obtain a target polymer.

The polymer compound of the present invention is preferably present in the photosensitive layer in an amount of 40.
-100% by weight, more preferably 60-100% by weight.

In the electrophotographic photoreceptor of the present invention, any of inorganic pigments and organic pigments can be used as a usable carrier-generating substance, as long as the substance generates free carriers by absorbing electromagnetic waves.

Examples of such a carrier generating substance (CGM) include the following.

(1) amorphous selenium, trigonal selenium, selenium-arsenic alloy, selenium-tellurium alloy, cadmium sulfide, cadmium selenide, cadmium sulfate selenide, mercury sulfide, lead sulfide,
Inorganic pigments such as zinc oxide and titanium oxide amorphous silicon (2) Azo pigments such as monoazo pigments, polyazo pigments, metal complex azo pigments, pyrazolone azo pigments, stilbene azo and thiazole azo pigments (3) Anthraquinone derivatives, anthantrone derivatives , Anthraquinone-based or polycyclic quinone-based pigments such as dibenzpyrenequinone derivatives, vilanthrone derivatives, biolanthrone derivatives and isobiolanthrone derivatives; (4) indigoid-based pigments such as indigo derivatives and thioindigo derivatives; (5) titanyl phthalocyanine, vanadyl phthalocyanine Various metal phthalocyanines such as nin, and α-type, β-type, γ
-Type, τ-type, τ'-type, η-type, η'-type, etc., phthalocyanine-based pigments such as non-metallic phthalocyanine (6) diphenylmethane-based pigments, triphenylmethane-based pigments, xanthene pigments, and acridine-based pigments (7) Quinone imine pigments such as azine pigments, oxazine pigments and thiazine pigments (8) Methine pigments such as cyanine pigments and azomethine pigments (9) Quinoline pigments (10) Nitro pigments (11) Nitroso pigments (12) Benzoquinone and naphthoquinone (13) Naphthalimide pigments (14) Perinone pigments such as bisbenzimidazole derivatives (15) Fluorenone pigments (16) Squarylium pigments (17) Azurenium compounds Further preferred examples of azo compounds and polycyclic quinone pigments It shows about. For specific examples of these compounds, see
-298013 and the like.

[However, in each of the above general formulas, Ar ¹ , Ar ² and Ar ³ : a substituted or unsubstituted carbocyclic aromatic ring group, R ¹ , R ² , R ³ and R ⁴ : an electron withdrawing group, respectively Or a hydrogen atom, and at least one of R ^{1 to} R ⁴ is an electron-withdrawing group such as a cyano group; (X is a hydroxy group, —NHSO ₂ + −R ⁸ (where R ⁶ and R ⁷ are each a hydrogen atom or a substituted or unsubstituted alkyl group, R ⁸ is a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group), Y Is a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, an alkoxy group, a carboxyl group, a sulfo group, a substituted or unsubstituted carbamoyl group or a substituted or unsubstituted sulfamoyl group (provided that when m is 2 or more, , may be different from each other group.), Z is atomic group necessary to configure a substituted or unsubstituted carbocyclic aromatic ring or a substituted or unsubstituted heterocyclic aromatic ring, R ⁵ Is a hydrogen atom, a substituted or unsubstituted amino group, a substituted or unsubstituted carbamoyl group, a carboxyl group or its ester group, and Ar ⁴ is a substituted or unsubstituted aryl A group, n is an integer of 1 or 2, and m is an integer of 0-4. )] Further, polycyclic quinone pigments of the following general formula [II] group can also be used as CGM.

(However, in this general formula, X ′ represents a halogen atom, a nitro group, a cyano group, an acyl group or a carboxyl group;
p represents an integer of 0 to 4, and q represents an integer of 0 to 6.

The squarylium pigment is described in JP-A-60-258550.

Japanese Patent Application No. 62-241983 for titanyl phthalocyanine
There is a description in the specification.

The azurenium compound is described in Japanese Patent Application No. 62-251188.

Furthermore, regarding special metal-free phthalocyanine,
It is described in the specification of 61-295784 and the like.

The polymer compound of the present invention has excellent photoconductivity, and the electrophotographic photoreceptor of the present invention can be produced by providing a photosensitive layer containing the same on a conductive support. The polymer compound of the present invention utilizes its excellent carrier transport ability,
A so-called function-separated type photoreceptor can be obtained by using this as a carrier transporting substance and using the above-mentioned carrier generating substance which can work effectively in combination with this. The function-separated type photoreceptor may be a mixed dispersion type of the two substances, but a carrier generation layer,
It is more preferable to form a laminated photoconductor in which a carrier transport layer is laminated.

In the case of a laminated photosensitive layer, most of the incident light is absorbed by the charge generation layer to generate a large amount of charge generation carriers, and the generated charge carriers are deactivated by recombination or trapping. It is preferable to use a thin film layer as far as possible within a range of a film thickness sufficient to generate photocarriers for injecting into the carrier transport layer without performing.

The carrier transport layer is electrically connected to the above-described carrier generation layer, and has a function of transporting charge carriers injected from the charge generation layer to the surface in the presence of an electric field.

In a single-layer function-separated type photoreceptor, photocarriers are generated and transported in a single layer, and the carrier-generating substance and the carrier-transporting substance are electrically coupled in the layer, and / or the carrier is generated. Substances also contribute to carrier transport.

Further, the carrier generation layer may contain both the carrier generation material and a part of the carrier transport material. In any of the layer configurations, a protective layer may be provided on the photosensitive layer, or an undercoat layer (intermediate layer) having a barrier function and adhesiveness may be provided between the support and the photosensitive layer.

Examples of the binder resin usable for the photosensitive layer, the protective layer, and the undercoat layer include polystyrene, polyethylene, polypropylene, acrylic resin, methacrylic resin, vinyl chloride resin, vinyl acetate resin, polyvinyl butyral resin, epoxy resin, polyurethane resin, and phenol. Resins, polyester resins, alkyd resins, polycarbonate resins, silicone resins, melamine resins, etc., addition polymerization type resins, polyaddition type resins, polycondensation type resins, and copolymers containing two or more of the repeating units of these resins Coalescing resin and the like. In addition to these insulating resins, poly-N-
High molecular organic semiconductors such as vinyl carbazole are exemplified.

Organic amines can be added to the photosensitive layer for the purpose of improving the carrier generation function of the carrier generation substance, and it is particularly preferable to add a secondary amine. The amount of the organic amine to be added is 1 time or less of the carrier generating substance, preferably 0.2 to 0.0 times the carrier generating substance.
The number of moles should be in the range of 05 times.

In the above-mentioned photosensitive layer, antioxidants such as hindered phenols, hindered amines, paraphenylenediamines, hydroquinones and organic phosphorus compounds can be added for the purpose of preventing ozone deterioration.

These compounds are known as antioxidants for rubbers, plastics, oils and the like, and commercially available products can be easily obtained.

These antioxidants may be added to any of the carrier generation layer, the carrier transport layer, and the protective layer, but are preferably added to the carrier transport layer. In this case, the amount of the antioxidant to be added is 0.1 to 100 parts by weight of the carrier transporting substance.
100 parts by weight, preferably 1 to 50 parts by weight, particularly preferably 5 to 25 parts by weight.

Next, as the conductive support for supporting the photosensitive layer, a metal plate of aluminum, nickel, or the like, a metal drum or a metal foil laminated, or a plastic film on which aluminum, tin oxide, indium oxide, or the like is deposited, or a conductive film. Films or drums, such as paper, plastic, etc. coated with a substance can be used.

In the present invention, the carrier-generating layer is typically prepared by dispersing the above-mentioned carrier-generating substance alone or in an appropriate dispersion medium together with an appropriate binder resin, for example, by dip coating, spray coating, blade coating, roll coating, or the like. It can be provided by a method of coating and drying on a support, an undercoat layer or a carrier transport layer. A ball mill, a homomixer, a sand mill, an ultrasonic disperser, an attritor, or the like is used for dispersing the carrier generating substance.

Examples of the dispersion medium of the carrier-generating substance include hydrocarbons such as hexane, benzene, toluene, and xylene; methylene chloride, 1,2-dichloroethane, sym-tetrachloroethane, 1,1,2-trichloroethane, and chloroform. Halogenated hydrocarbons; ketones such as acetone, methyl ethyl ketone and cyclohexanone; esters such as ethyl acetate and butyl acetate; methanol, ethanol, propanol, butanol, cyclohexanol, heptanol, ethylene glycol, methyl cellosolve, ethyl cellosolve and acetic acid Alcohols such as cellosolve and derivatives thereof; ethers such as tetrahydrofuran, 1,4-dioxane, furan and furfural, acerals; pyridine, butylamine, diethylamine, ethylenediamine, isopropanolamine Nitrogen compounds such as amides such as N, N-dimethylformamide; and one or more kinds of sulfur and phosphorus compounds such as fatty acids and phenols, carbon disulfide and triethyl phosphate, and the like. .

When the photoreceptor of the present invention has a laminated structure, the weight ratio of binder: carrier generating substance: carrier transporting substance in the carrier generating layer is preferably from 0 to 100: 1 to 500: 0 to 500.

If the content of the carrier-generating substance is less than this, the sensitivity is low and the residual potential is increased, and if it is more than this, the dark decay and the receiving potential are reduced.

The thickness of the carrier generation layer formed as described above is preferably 0.01 to 10 μm, particularly preferably 0.1 to 5 μm.
μm.

In the present invention, the carrier transporting layer can be formed by applying and drying a carrier transporting substance comprising the polymer compound of the present invention alone or in a state of being dissolved and dispersed together with the binder resin described above. As the dispersion medium to be used, the dispersion medium used in dispersion of the carrier generating substance can be used.

In the present invention, other carrier transporting substances can be used together with the polymer compound of the present invention as long as the object of the present invention is not impaired. Although there is no particular limitation on the carrier transporting substance that can be used, for example, oxazole derivatives, oxadiazole derivatives, thiazole derivatives, thiadiazole derivatives, triazole derivatives, imidazole derivatives, imidazolone derivatives, imidazolidine derivatives, bisimidazolidine derivatives, styryl compounds Hydrazone compound, pyrazoline compound, amine derivative, oxazolone derivative, benzothiazole derivative, benzimidazole derivative, quinazoline derivative, benzofuran derivative, acridine derivative, phenazine derivative, aminostilbene derivative, poly-N-vinylcarbazole, poly-1-vinylpyrene, And poly-9-vinylanthracene.

In the present invention, the added amount of the carrier transporting substance is preferably 20 to 200 parts by weight, more preferably 30 to 100 parts by weight, based on 100 parts by weight of the binder resin in the carrier transporting layer.
~ 150 parts by weight.

The thickness of the formed carrier transport layer is preferably 5 to 5.
It is 50 μm, particularly preferably 5 to 30 μm.

In the case of a single-layer function-separated electrophotographic photoreceptor, the ratio of binder: carrier generating substance: carrier transporting substance is preferably 0 to 100: 1 to 500: 0 to 500, and the thickness of the formed photosensitive layer Is preferably 5 to 50 μm, particularly preferably 5 to 30 μm.
μm.

In the present invention, one or two or more kinds of electron accepting substances can be contained in the carrier generating layer for the purpose of improving sensitivity, reducing residual potential or reducing fatigue upon repeated use. The addition ratio of the electron accepting substance is a weight ratio, and the carrier generating substance according to the present invention: the electron accepting substance = 100: 0.01 to 200
And more preferably 100: 0.1 to 100.

The electron accepting substance may be added to the carrier transport layer,
In this case, the addition ratio of the electron-accepting substance is preferably 100: 0.01 to 100, more preferably 100: 0.1 to 50, in terms of weight ratio.

The photoreceptor of the present invention may further contain, if necessary, an ultraviolet absorber, an antioxidant or the like for the purpose of protecting the photosensitive layer, or may contain a dye for correcting color sensitivity.

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples.
The present invention is not limited by these.

Example 1 An intermediate layer having a thickness of about 0.1 μm and made of a vinyl chloride-vinyl acetate-maleic acid copolymer “ESREC MF-10” (manufactured by Sekisui Chemical Co., Ltd.) was provided on a PET film on which Al was deposited. Next, 40 g of dibromoanthanesolone was pulverized by a ball mill for 24 hours, and 20 g of bisphenol A-type polycarbonate “PANLITE L-1250” (manufactured by Teijin Chemicals Ltd.) was added thereto.
A solution dissolved in 1300 ml of 1,2-dichloroethane was added and dispersed for another 24 hours, and the resulting dispersion was applied on the intermediate layer with a wire bar to form a carrier generating layer having a thickness of about 0.5 μm.

Next, the polymer compound of the present invention (2
-1) A solution prepared by dissolving 20 g in 200 ml of 1,2-dichloroethane is applied to the carrier generating layer using a doctor blade, and dried at a temperature of 90 ° C. for 1 hour to form a carrier transporting layer (about 10 μm thick). A photoreceptor sample was prepared.

The obtained sample was evaluated for accepting potential (V _a ), residual potential (V _r ), sensitivity (E _1/2 ), and deposition property.

 A photoconductor tester was used for evaluation of the photoconductor sample.

 Table 1 shows the results.

Example 2 Example 1 was the same as Example 1 except that the polymer compound (2-1) of the present invention in the carrier transport layer was changed to the polymer compound (3-1) of the present invention synthesized in Synthesis Example 2. In the same manner as in the above, a photoreceptor sample was prepared and evaluated in the same manner. Table 1 shows the results.

Example 3 Example 1 was the same as Example 1 except that the polymer compound (3-1) of the present invention in the carrier transport layer was changed to the polymer compound (5-1) of the present invention synthesized in Synthesis Example 3. In the same manner as in the above, a photoreceptor sample was prepared and evaluated in the same manner. Table 1 shows the results.

Comparative Example 1 80 g of a carrier transporting material represented by the following structural formula and 160 g of an acrylic resin dial BR-80 (manufactured by Mitsubishi Rayon) were mixed with 1,
A comparative photoreceptor sample was prepared in the same manner as in Example 1 except that a solution obtained by dissolving in 1070 ml of 2-dichloroethane was applied on the carrier generating layer using a doctor blade to form a carrier transporting layer (film thickness: 10 μm). It was prepared and evaluated similarly. Table 1 shows the results.

Comparative Example 2 In Example 1, the polymer compound (2-1) of the present invention was used.
A comparative photoreceptor sample was prepared and evaluated in the same manner as in Example 1 except that polyvinyl carbazole (Tubicol 210 manufactured by Anan Koshiro) was used instead. Table 1 shows the results.

Comparative Example 3 60 g of triphenylamine and 100 g of polycarbonate were mixed in 1,2
A comparative photoreceptor sample was prepared and evaluated in the same manner as in Example 1 except that a solution dissolved in 1000 ml of dichloroethane was applied to form a carrier transport layer. Triphenylamine was deposited on the photosensitive layer. Table 1 includes other results.

As is clear from Table 1, all of Examples 1 to 3 using the polymer compound of the present invention as a carrier transporting substance,
It is superior in all characteristics as compared with each of Comparative Examples 1 to 3 using a carrier transporting substance outside the present invention.

[Effects of the Invention] As described in detail above, the polymer compound of the present invention can provide an electrophotographic photoreceptor having excellent mechanical strength and photoconductivity without crystal precipitation or phase separation. .

Claims (1)

(57) [Claims] 1. The following structural units (I), (II) and (III)
An electrophotographic photoreceptor containing a polymer compound having at least one repeating unit containing at least one of the following. [Wherein, R ₁ , R ₂ , R ₃ , R ₄ and R ₅ each represent an alkyl group or an alkoxy group, and n ₁ and n ₃ each represent an integer of 1 to 5,
n ₂ , n ₄ and n ₅ each represent an integer of 1 to 4. Further, l, m and p each represent a number greater than 0 and 1 or less. ]