JPH10186686A - Electrophotographic sensitive body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce an electrophotographic photoreceptor high in productivity of the electrophotographic photoreceptor since a coating liq. is stable, hardly causing a scratch and scraping on a photosensitive layer, good in toner- reliability, high in durability, good in toner leaving and excellent in cost effectiveness by incorporating a specified polycarbonate in the photosensitive layer as a resin binder. SOLUTION: The polycarbonate expressed by a formula is incorporated in the photosensitive layer on a conductive base body as the resin binder. In the formula, (l) and (m) are polymerization degree. The polycarbonate in this case is a high polymer having carbonyldioxy group -O-CO-O-. Then the polycarbonate is used at the photosensitive layer of the electrophotographic photoreceptor or a surface protective layer. When a laminated photosensitive layer is incorporated in the electrophotographic photoreceptor, the polycarbonate is used as the resin binder at either layer of a charge generating layer or a charge transferring layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive layer of an electrophotographic photosensitive member used for an electrophotographic printer, a copying machine, a facsimile and the like, and more particularly to a resin binder used for the photosensitive layer.

[0002]

2. Description of the Related Art In recent years, photoreceptors for organic electrophotography using organic photoconductive substances have been recently developed because of their non-polluting, low cost, and various characteristics of the photoreceptor depending on the degree of freedom of material selection.
Many have been proposed and put to practical use. The photosensitive layer of an organic electrophotographic photoreceptor mainly comprises a layer in which an organic photoconductive compound is dispersed in a resin binder, and a charge generation layer in which a charge generation material is dispersed in a resin and a charge in which a charge transport material is dispersed in a resin. There are a laminate type in which a transport layer is laminated and a single layer in which a charge generation material and a charge transport material are dispersed in a resin.

[0003] In these photosensitive layers, bisphenol A type polycarbonate is widely used as a resin binder, and a coating solution in which an organic photoconductive compound and a resin binder are dissolved or dispersed in an organic solvent is coated on the surface of a cylindrical conductive substrate. Often formed by coating.

[0004]

However, the use of bisphenol A type polycarbonate as a resin binder has the following problems. (1) When tetrahydrofuran (THF) or the like is used as an organic solvent when preparing the above coating liquid, the coating liquid gels in a few days, and when coated with the coating liquid, a uniform and good photosensitive layer is obtained. Is impossible to form.

(2) The formed photosensitive layer is liable to cause a solvent crack or a crack due to internal stress. A large crack appears as an image defect as it is, and a small crack tends to cause a current leak from the charging member to the conductive layer of the photoreceptor, particularly in an electrophotographic apparatus using a contact charging type charging device, so that an image defect appears. (3) The formed photosensitive layer is easily damaged by repeated use of the photoreceptor, and a filming phenomenon such that toner is entrapped in the wound and causes cleaning failure occurs, causing white spot-like defects on a solid black image. Occurs. Further, the film is scraped by repeated use, and the life of the photoconductor is shorter than that of the inorganic photoconductor.

As a solution to the problem of gelation, it is possible to increase the time required for gelation by using methylene chloride or the like as an organic solvent, but this is not a sufficient solution. Also, JP-A-59-71057, JP-A-60-71057
No. 1,720,44 discloses a method using bisphenol Z-type polycarbonate. However, bisphenol Z-type polycarbonate does not have the effect of preventing cracks, and therefore JP-A-61-62040 discloses a method of mixing bisphenol A-type polycarbonate and bisphenol Z-type polycarbonate, which is disclosed in JP-A-61-105550. Discloses a method using a copolymer of bisphenol A type and bisphenol Z type. However, none of these methods is a sufficient solution to the above crack generation.

[0007] Regarding the problem of flaws, see JP-A-57-212.
No. 453 discloses a method for improving lubricity by adding silicone oil, and JP-A-63-65444 discloses a method using a modified polycarbonate having a trifluoromethyl group. Electrophotographic photoreceptors include (1) charging for uniformly applying a charge to the surface, (2) exposure for irradiating a charged portion with a light image, and (3) colored powder of an electrostatic latent image formed by charging and exposure. (Toner) development by visualization by adhesion, (4) transfer by transferring a toner image to a final recording medium such as paper, and (5) fusing by fusing the transferred toner image to a recording medium. Machine,
Used for printers, faxes, etc.

In the charging step (1), charging by corona discharge such as corotron or scorotron, which is one of non-contact methods, has been conventionally used in many cases. In recent years, since there is an advantage that a high voltage is not required and the amount of generated ozone is small, contact charging using a roller or a brush has been put to practical use. However, contact charging with a roller tends to cause the above-described current leak, and charging with a brush tends to damage the surface of the photoconductor, thereby shortening the life of the photoconductor.

In the developing step (3), a liquid developing method using a developing solution in which small-sized toner particles are dispersed in an insulating liquid, a developing method using a dry toner, and the like are used.
Development methods using dry toner include a two-component development method using a developer consisting of a toner and a carrier and a one-component development method using a developer consisting of only a toner. The method used in contact is used.
Among them, a two-component contact development method using a magnetic brush and a magnetic toner and an insulating carrier, and a one-component contact development method using a one-component magnetic toner are mainly used. In recent years, a one-component contact developing method using a non-magnetic toner and a developing method called a jumping developing method using a one-component magnetic toner and applying an AC bias are becoming mainstream. More recently, a cleanerless printer that performs cleaning simultaneously with development and does not have a cleaner system such as a cleaning blade has been commercialized. In this case, a spherical polymerized toner having a small particle diameter is used. In general, small particle size toners such as liquid developing toners and polymerized toners are expected to have high resolution. However, since the surface area is large, the adhesion to the photoreceptor increases, and filming is likely to occur. In the transfer step 4), not only does the toner not completely transfer to a recording medium such as paper, but also in the subsequent cleaning step, the toner remains on the photoreceptor and may appear as an image defect. Also, if the transfer efficiency is low, it causes an increase in the amount of consumed toner and waste toner, and this has been highlighted as an environmental problem, and a photoreceptor with good toner separation is desired.

The present invention has been made in view of the above points, and an object of the present invention is to improve a resin binder used for a photosensitive layer so that a coating solution can be stably produced and the productivity of an electrophotographic photosensitive member is high. An object of the present invention is to provide an electrophotographic photoreceptor in which a layer is hardly damaged or scraped, has good image characteristics and high durability, has good toner separation, and is economical.

[0011]

According to a first aspect of the present invention, there is provided an electrophotographic photosensitive member having a photosensitive layer on a conductive substrate, wherein the photosensitive layer comprises a polycarbonate represented by the chemical formula (1) and a resin binder. It is achieved by containing as.

[0012]

Embedded image (In the above formula (1), l and m represent the degree of polymerization.) According to the second invention, the photosensitive layer is a bisphenol A type polycarbonate represented by the chemical formula (2) in addition to the polycarbonate represented by the chemical formula (1) , Bisphenol Z-type polycarbonate represented by chemical formula (3), chemical formula (4)
It is effective to contain, as a resin binder, one of the group consisting of a polycarbonate represented by the following formula and a polycarbonate represented by the chemical formula (5).

[0013]

Embedded image (In the above formula (2), n represents the degree of polymerization.)

[0014]

Embedded image (In the above formula (3), o represents the degree of polymerization.)

[0015]

Embedded image (In the above formula (4), p and q represent the degree of polymerization.)

[0016]

Embedded image (In the above formula (5), r and s represent the degree of polymerization.) According to the third invention, in the first or second invention, the photosensitive layer comprises a charge generation layer laminated on a conductive substrate and a charge transport layer. It is effective to be a layer.

[0017]

DETAILED DESCRIPTION OF THE INVENTION The polycarbonate of the present invention is a polymer having a carbonyldioxy group -O-CO-O-. Polycarbonate is used for a photosensitive layer or a surface protective layer of an electrophotographic photosensitive member. When the electrophotographic photosensitive member has a laminated photosensitive layer, the polycarbonate is used as a resin binder in either the charge generation layer or the charge transport layer. The polycarbonate of the present invention includes, in addition to the polycarbonate represented by the chemical formula (1), the chemical formula (1)
A mixture of the polycarbonate represented by the formula (2) and the polycarbonate represented by the chemical formula (2), the mixture of the polycarbonate represented by the chemical formula (1) and the polycarbonate represented by the chemical formula (3), and the polycarbonate represented by the chemical formula (1) and the chemical formula (4) A mixture of the polycarbonate represented by the formula (1) and the mixture of the polycarbonate represented by the formula (1) and the polycarbonate represented by the formula (5) are selected.

The polycarbonate represented by the chemical formula (1), the chemical formula (2), the chemical formula (3), the chemical formula (4) or the chemical formula (5) is also used as a copolymer of these and a polymer having another structure. be able to. The terminal group of the polymer is not specified, and may have various groups such as a hydroxyl group and a t-butyl group.

[0019]

Embedded image (In the above formula (1), l and m represent the degree of polymerization, and 0.3 <
1 / (l + m) <0.8. )

[0020]

Embedded image (In the above formula (2), n represents the degree of polymerization.)

[0021]

Embedded image (In the above formula (3), o represents the degree of polymerization.)

[0022]

Embedded image (In the above formula (4), p and q represent the degree of polymerization, and 0.1 <
The relationship of p / (p + q) <0.9 is shown. )

[0023]

Embedded image (In the above formula (5), r and s represent the degree of polymerization, and 0.1 <
The relationship of r / (r + s) <0.9 is shown. FIG. 1 is a schematic sectional view showing a photoreceptor according to an embodiment of the present invention. FIG. 2 is a schematic sectional view showing a photoconductor according to a different embodiment of the present invention.

FIG. 3 is a schematic sectional view showing a photosensitive member according to still another embodiment of the present invention. FIG. 4 is a schematic sectional view showing a photoconductor according to still another embodiment of the present invention. FIG. 5 is a schematic sectional view showing a photoconductor according to still another embodiment of the present invention. In the upper figure, 1 is a conductive substrate, 2 is an undercoat layer, 3 is a charge generation layer, 4 is a charge transport layer, 5 is a surface protective layer, 6 is a photosensitive layer, and the photosensitive layer is a charge generation layer and a charge transport layer. It is a separated function-separated type or a single-layer type containing a charge generating substance and a charge transporting substance. The photosensitive layer shown in FIGS. 1 and 2 is a negative charge type in which a charge generation layer and a charge transport layer are laminated in this order, and the photosensitive layer in FIG. 3 is a positive charge type in which a charge transport layer and a charge generation layer are laminated in this order. is there. The photosensitive layers in FIGS. 4 and 5 are of a single-layer type and mainly of a positive charging type.

The conductive substrate 1 serves not only as an electrode of the photoreceptor but also as a support for the other layers, and may be cylindrical, plate-like or film-like, and may be made of metal such as aluminum, stainless steel or nickel. Alternatively, a conductive material may be applied to glass, resin, or the like. Undercoat layer 2
Is composed of a layer mainly composed of resin, an oxide film such as alumite, etc., for the purpose of preventing injection of unnecessary charges from the conductive substrate to the photosensitive layer, covering defects on the surface of the substrate, and improving the adhesiveness of the photosensitive layer. Provided as needed. As a resin binder, polyethylene, polypropylene, polystyrene, acrylic resin, vinyl chloride resin, vinyl acetate resin, polyurethane resin, epoxy resin, polyester resin, melamine resin, silicon resin, polybutyral resin, polyamide resin, and copolymers thereof, as appropriate. It is possible to use them in combination. Further, metal oxide fine particles and the like may be contained in the resin binder. As the metal oxide fine particles, SiO ₂ , TiO ₂ , In ₂ O ₃ , ZrO _{2 and the} like can be used.

The thickness of the undercoat layer depends on the composition of the undercoat layer, but can be arbitrarily set within such a range that adverse effects such as an increase in residual potential when used repeatedly and continuously do not occur. The charge generation layer 3 is formed by vacuum-depositing an organic photoconductive substance or applying a coating liquid in which particles of the organic photoconductive substance are dispersed in a resin binder, and generates charges by receiving light. In addition, it is important that the charge generation efficiency is high, and at the same time, the injected property of the generated charge into the charge transport layer 4 is important. Since the charge generation layer 3 only needs to have a charge generation function, its thickness is determined by the light absorption coefficient of the charge generation substance and is generally 5 μm or less.
Preferably it is 1 μm or less. The charge generation layer may be mainly composed of a charge generation substance, to which a charge transport substance or the like is added. As the charge generating substance, phthalocyanine pigments, azo pigments, anthrone pigments, perylene pigments, perinone pigments, squarylium pigments, thiapyrylium pigments, quinacridone pigments, and the like can be used.
These pigments may be used in combination. In particular, phthalocyanine pigments include metal-free phthalocyanine,
Copper phthalocyanine and titanyl phthalocyanine are preferable, and the Bragg angle 2θ of the X-ray diffraction spectrum using X-type metal-free phthalocyanine, τ-type metal-free phthalocyanine, ε-type copper phthalocyanine, β-type titanyl phthalocyanine, Y-type titanyl phthalocyanine or CuKα is 9. 6 °
Phthalocyanine with a maximum peak of
-289363).

As the resin binder, besides the polycarbonate of the present invention, the polycarbonate of the present invention and other polycarbonates, polyesters, polyamides, polyurethanes, epoxies, polybutyrals, vinyl chloride copolymers, phenoxy resins, silicone resins, methacrylates Resins and their copolymers can be used in appropriate combination.

The charge transport layer 4 is a coating film in which a charge transport material is dispersed in a resin binder. In a dark place, the charge of the photoreceptor is retained as an insulator layer. Demonstrate the function of transporting. Examples of charge transport materials include hydrazone compounds, pyrazoline compounds, pyrazolone compounds, oxadiazole compounds, oxazole compounds, arylamine compounds, benzidine compounds,
It is possible to use charge transporting polymers such as stilbene compounds, styryl compounds and polyvinyl carbazole. Particularly, the following compounds are preferred.

[0029]

Embedded image

[0030]

Embedded image As the resin binder, in addition to the polycarbonate of the present invention, the polycarbonate of the present invention and another polycarbonate,
Polyester, polyamide, polyurethane, epoxy,
Polybutyral, a polyvinyl chloride copolymer, a phenoxy resin, a silicone resin, a methacrylate resin, and a copolymer of these can be used in appropriate combination.

The thickness of the charge transport layer is preferably in the range of 3 to 50 μm in order to maintain a practically effective surface potential.
More preferably, it is 10 to 40 μm. The single-layer type photosensitive layer is a coating film in which a charge generating substance and a charge transporting substance are dispersed in a resin binder.
The substances used for the above can be similarly used. The film thickness is 3 to 50 μm to maintain a practically effective surface potential.
m is preferably in the range of 10 to 40 μm.

In these photosensitive layers, an electron accepting substance can be contained, if necessary, in order to improve the sensitivity, reduce the residual potential, or reduce the fluctuation in characteristics upon repeated use. Electron acceptors include succinic anhydride, maleic anhydride, dibromosuccinic anhydride, phthalic anhydride, 3-nitrophthalic anhydride, 4-nitrophthalic anhydride, pyromellitic anhydride, pyromellitic acid, trimellitic acid, Trimellitic anhydride, phthalimide, 4-nitrophthalimide,
Compounds having a high electron affinity, such as tetratocyanoethylene, tetracyanosinodimethane, chloranil, bromanyl, and o-nitrobenzoic acid, may be mentioned.

The photosensitive layer may also contain a deterioration inhibitor such as an antioxidant or a light stabilizer for the purpose of improving environmental resistance and stability against harmful light. Compounds used for such purposes include chromanol derivatives such as tocopherol, etherified compounds, esterified compounds, polyarylalkane compounds, hydroquinone derivatives, dietherified compounds, benzophenone derivatives, benzotriazole derivatives, thioether compounds, phenylenediamine derivatives , Phosphonates,
Phosphites, phenol compounds, hindered phenol compounds, linear amine compounds, cyclic amine compounds,
Hindered amine compounds and the like.

The photosensitive layer may contain a leveling agent such as silicone oil or fluorine-based oil in order to improve the leveling property and the lubricity of the formed film. The surface protective layer 5 is provided as needed. The surface protective layer is excellent in lubricity, excellent in durability against mechanical stress, is composed of a chemically stable material, has a function of receiving and holding a charge of corona discharge in a dark place, and It is necessary for the charge generation layer to have the ability to transmit sensitive light, to transmit light at the time of exposure, to reach the charge generation layer, and to neutralize and eliminate surface charges by receiving the generated charge. Further, as described above, it is desirable that the surface protective layer is as transparent as possible in the wavelength region where the light absorption of the charge generating substance is maximum.

In the surface protective layer, in addition to the polycarbonate of the present invention, modified silicone resins such as acrylic modified silicone resin, epoxy modified silicone resin, alkyd modified silicone resin, polyester modified silicone resin, urethane modified silicone resin, etc .; Silicon resin or the like can be applied. These resins can be used alone, but for the purpose of further improving durability, SiO ₂ , Ti
A mixture with a condensate of a metal alkoxy compound that can form a film containing O ₂ , In ₂ O ₃ , and ZrO ₂ as main components is preferable. Further, a leveling agent such as silicone oil or fluorine-based oil may be contained in order to improve the leveling property and the lubricating property of the protective layer.

The thickness of the surface protective layer can be arbitrarily set within such a range that adverse effects such as an increase in residual potential when repeatedly used continuously are not caused.

[0037]

Next, an embodiment of the present invention will be described. Example 1 A drum photoreceptor (30φ) was prepared for evaluating electrical characteristics.
An undercoat layer dispersion having the following composition was dip-coated on an aluminum tube and dried at 100 ° C. for 30 minutes to form an undercoat layer 2 having a thickness of 3 μm.

Alcohol-soluble nylon (CM8000: Toray Industries, Inc.) 5 parts Titanium oxide fine particles treated with aminosilane 5 parts Methanol / methylene chloride mixed solvent (6: 4) 90 parts Next, a dispersion for a charge generation layer having the following composition was prepared. Dip coating, 10
After drying at 0 ° C. for 30 minutes, a charge generation layer 3 having a thickness of 0.3 μm was formed.

Titanyl phthalocyanine 1 part Vinyl chloride copolymer resin (MR-110: Nippon Zeon Co., Ltd.) 1 part Methylene chloride 98 parts FIG. 6 is a diagram showing an X-ray diffraction spectrum of the titanyl phthalocyanine by CuKα ray. .

Next, a charge transport layer 4 having a thickness of 20 μm was formed by dip coating with a solution for a charge transport layer having the following composition and drying at 100 ° C. for 30 minutes. Hydrazone compound (Chemical formula (14), CTC 191: Anan fragrance) 9 parts Butadiene compound (Chemical formula (11), T405: Anan fragrance) 1 part Polycarbonate resin (Chemical formula (1)) 10 parts Methylene chloride 90 parts Example 2 Instead of 10 parts of the polycarbonate represented by the chemical formula (1) used in Example 1, 5 parts of the polycarbonate represented by the chemical formula (1) and bisphenol A type polycarbonate (Panlite K1300: Teijin Chemicals Ltd.) 5 A photoreceptor was prepared in the same manner as in Example 1, except that parts were mixed and used. Example 3 Instead of 10 parts of the polycarbonate represented by the chemical formula (1) used in Example 1, 5 parts of the polycarbonate represented by the chemical formula (1) and bisphenol Z-type polycarbonate (Panlite TS2050: Teijin Chemicals Ltd.) 5 A photoreceptor was prepared in the same manner as in Example 1, except that parts were mixed and used. Example 4 Instead of 10 parts of the polycarbonate represented by the chemical formula (1) used in Example 1, 5 parts of the polycarbonate represented by the chemical formula (1) and a copolymerized polycarbonate (Tafzet BPPC-3: Idemitsu Kosan Co., Ltd.) 5 A photoreceptor was prepared in the same manner as in Example 1, except that parts were mixed and used. Example 5 Instead of 10 parts of the polycarbonate represented by the chemical formula (1) used in Example 1, 5 parts of the polycarbonate represented by the chemical formula (1) and polycarbonate (APEC KUI-93)
71: A photoreceptor was produced in the same manner as in Example 1 except that 5 parts of Bayer Co., Ltd. was mixed and used. Comparative Example 1 Bisphenol A type polycarbonate (Panlite K1300: Teijin Chemicals Ltd.) 10 was used in place of 10 parts of the polycarbonate represented by the chemical formula (1) used in Example 1.
A photoreceptor was produced in the same manner as in Example 1 except that parts were used. Comparative Example 2 Bisphenol Z-type polycarbonate (Panlite TS2050: Teijin Chemicals Ltd.) 1 was used instead of 10 parts of the polycarbonate represented by the chemical formula (1) used in Example 1.
A photoconductor was prepared in the same manner as in Example 1, except that 0 part was used. Comparative Example 3 In the same manner as in Example 1 except that 10 parts of a polycarbonate resin represented by the chemical formula (1) used in Example 1 was replaced with 10 parts of a copolymerized polycarbonate resin (Tuffet BPPC-3: Idemitsu Kosan Co., Ltd.). To produce a photoreceptor. Comparative Example 4 7 parts of bisphenol A-type polycarbonate (Panlite K1300: Teijin Chemicals Ltd.) and bisphenol Z-type polycarbonate (Panlite) were used instead of 10 parts of the polycarbonate represented by the chemical formula (1) used in Example 1.
TS2050: A photoconductor was prepared in the same manner as in Example 1, except that 3 parts of Teijin Chemicals Ltd. was used.

The solution for the charge transport layer used in the preparation of the photoreceptor was allowed to stand for one month in an environment at a temperature of 20 ° C. and a humidity of 50% in a dark place, and the presence or absence of gelation of the solution for the charge transport layer was confirmed. Next, the durability of the obtained photoreceptor was evaluated. Photoreceptor laser printer manufactured by Hewlett-Packard Company
Attached to the Laser Jet 4 plus, an image with a printing rate of about 5% was printed on 10,000 sheets, and a full black image and a full white image were printed every 1,000 sheets. Then, the surface of the photoreceptor was visually evaluated, the image was visually evaluated, and the amount of film shaving after 10,000 images were output was evaluated.

The results are shown in Table 1.

[0043]

[Table 1] In Examples 1 to 5, it can be seen that the solution for the charge transport layer (CTL solution) does not gel even when left for one month. No filming occurs on the photoreceptor surface, and there is no image defect. It can be seen that the amount of film scraping after 10,000 images have been output is smaller than that of the comparative example.

[0044]

According to the present invention, the photosensitive layer has the chemical formula (1)
Or a bisphenol A-type polycarbonate represented by the chemical formula (2), a bisphenol A-type polycarbonate represented by the chemical formula (3), in addition to the polycarbonate represented by the chemical formula (1), Since the polycarbonate represented by the chemical formula (4) or the polycarbonate represented by the chemical formula (5) is contained as a resin binder, the coating liquid is stable and the productivity of the electrophotographic photoreceptor is high. It is possible to obtain an electrophotographic photoreceptor which is hard to be scratched or scraped, has good image characteristics, has high durability, has good toner separation, and is excellent in economical efficiency.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a photosensitive member according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a photoreceptor according to a different embodiment of the present invention.

FIG. 3 is a schematic sectional view showing a photoconductor according to still another embodiment of the present invention.

FIG. 4 is a schematic sectional view showing a photoreceptor according to still another embodiment of the present invention.

FIG. 5 is a schematic sectional view showing a photoconductor according to still another embodiment of the present invention.

FIG. 6 is a diagram showing an X-ray diffraction spectrum of the titanyl phthalocyanine by CuKα radiation.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 conductive substrate 2 undercoat layer 3 charge generation layer 4 charge transport layer 5 surface protective layer 6 photosensitive layer

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiko Kasahara 1-1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Fuji Electric Co., Ltd.

Claims (3)

[Claims] 1. An electrophotographic photosensitive member having a photosensitive layer on a conductive substrate, wherein the photosensitive layer contains a polycarbonate represented by the chemical formula (1) as a resin binder. Embedded image (In the above formula (1), l and m represent the degree of polymerization.) 2. The photosensitive layer further comprises a bisphenol A-type polycarbonate represented by the chemical formula (2), a bisphenol Z-type polycarbonate represented by the chemical formula (3), a polycarbonate represented by the chemical formula (4), and a chemical formula (5). The electrophotographic photoreceptor according to claim 1, wherein the electrophotographic photoreceptor contains any one of a group consisting of the represented polycarbonate as a resin binder. Embedded image (In the above formula (2), n represents the degree of polymerization.) (In the above formula (3), o represents the degree of polymerization.) (In the above formula (4), p and q represent the degree of polymerization.) (In the above formula (5), r and s represent the degree of polymerization.) 3. The electrophotographic photoconductor according to claim 1, wherein the photosensitive layer is a charge generation layer and a charge transport layer laminated on a conductive substrate.