JPH08190213A - Electrophotographic photoreceptor - Google Patents

Abstract

PURPOSE: To produce an electrophotographic photoreceptor for laser beam exposure maintaining satisfactory electrophotographic characteristics at a low cost. CONSTITUTION: This electrophotographic photoreceptor has an electrically conductive substrate, an electric charge generating layer 4 formed on the substrate and contg. an electric charge generating material and a resin binder as essential components and an electric charge transferring layer 5 formed on the layer 4 and contg. an electric charge transferring material, fine org. resin particles and a resin binder as essential components. The fine org. resin particles in the layer 5 are fine methylsiloxane resin particles 6 or fine org. resin particles surface-coated with methylsiloxane resin, the particles are contained by 20-100 pts.wt. per 100 pts.wt. (expressed in terms of solid matter) of the resin binder and the electric charge transferring material is contained by 10-60 pts.wt. per 90 pts.wt., in total, of the resin binder and the fine org. resin particles.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an electrophotographic photoreceptor. More specifically, the present invention relates to an electrophotographic photoreceptor for laser exposure which has good image characteristics and can improve the sensitivity of the photoreceptor.

[0002]

2. Description of the Related Art Conventionally, an electrophotographic photosensitive member having a photoconductive layer provided on a drum-shaped, sheet-shaped or belt-shaped substrate has been used as a photosensitive member for electrophotographic copying machines, laser printers and the like. There is. As the electrophotographic photoreceptor,
Although a selenium-based inorganic photoreceptor is used, it has the drawbacks of being expensive and toxic because it is manufactured by a vacuum deposition method.

As an alternative to the inorganic photoconductor, an organic electrophotographic photoconductor using an organic photoconductive compound such as phthalocyanine has been proposed in JP-A-54-147839.

Particularly recently, a laminated type organic electrophotographic photoreceptor provided with two layers, a charge generation layer for generating charges upon exposure and a charge transport layer for transporting the generated charges, is disclosed in, for example, JP-A-59-59. This is disclosed in Japanese Patent Publication No. 71057, which has become the mainstream of electrophotographic photoreceptors. But,
The charge-transporting substance, which is the main material of the charge-transporting layer, is generally expensive, and since it is compounded in a high concentration, it is expensive, and there is a problem that the charge-transporting substance is crystallized. Japanese Patent Publication No. 6-23852 proposes a means of incorporating organic resin fine particles in the charge transport layer for the purpose of preventing laser light interference in the photoconductor.
However, the compounding ratio of the organic resin fine particles here is extremely small, and is characterized by being distributed near the boundary with the charge generation layer.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems in the above-mentioned laminated type organic electrophotographic photosensitive member, can be manufactured at a low cost, and has excellent electrophotographic characteristics for laser exposure. It is intended to provide an electrophotographic photoreceptor.

[0006]

DISCLOSURE OF THE INVENTION As a result of intensive studies made by the present inventors in order to overcome the above-mentioned problems, in the electrophotographic photoreceptor comprising a charge generation layer and a charge transport layer, the charge transport layer is formed. The inventors have found that the problem can be solved by containing a relatively large amount of methylsiloxane resin particles or organic resin fine particles having a surface coated with methylsiloxane resin, and completed the present invention.

That is, the electrophotographic photosensitive member according to the present invention comprises a conductive support and a conductive support formed on the conductive support.
And a charge-generating layer containing a charge-generating substance and a binder resin as main components, and a charge-transporting layer formed on the charge-generating layer and containing the charge-transporting substance, organic resin particles and a binder resin as the main components. The organic resin fine particles of the charge transport layer are methyl siloxane resin fine particles or organic resin fine particles having a surface coated with methyl siloxane resin, and contain 20 to 100 parts by weight with respect to 100 parts by weight (solid content) of the binder resin. In addition, the charge transport material is contained in an amount of 10 to 60 parts by weight based on 90 parts by weight of the total amount of the binder resin and the organic resin fine particles.

According to the present invention, the cost can be reduced by reducing the concentration of the charge transport material in the charge transport layer, and the crystallization of the charge transport material can be prevented. However, if the concentration of the charge transport material is lowered, the sensitivity is lowered, so it is necessary to enhance the sensitivity by some method. Therefore, by adding methyl siloxane resin particles to the charge transport layer, a path for locally passing charges can be formed to improve the sensitivity. Further, according to the present invention, the methylsiloxane resin particles are simply added and dispersed in the coating liquid for coating the charge transport layer, and no special treatment or process is required, which is advantageous in manufacturing.

Usually, in order to improve the sensitivity, (1)
Attempts have been made to increase the content of the charge transporting material in the charge transporting layer; (2) use a charge transporting material having higher mobility, but any charge transporting material can be applied in the present invention. Therefore, a high-sensitivity photoconductor can be manufactured at low cost by using these charge-transporting substances in combination with specific organic resin fine particles.

An object of the present invention is to provide an electrophotographic photoreceptor for laser exposure which can be manufactured at low cost and has good electrophotographic characteristics, and contains a large amount of organic fine particles of a specific material. In addition, since the fine particles are uniformly distributed in the charge transport layer, the structure is obviously different from that of the above-mentioned Japanese Patent Publication No. 6-23852.

Next, the constitution of the method of the present invention will be described in detail.
Examples of the preferred layer structure of the electrophotographic photoreceptor of the present invention include the layer structures (1) and (2) below. (1) A structure in which a charge transport layer, a charge generation layer, and a conductive support are arranged in this order from the upper layer as shown in FIG. (2) An undercoat layer (a layer having a function such as an intermediate layer or an adhesive layer) between the charge generation layer and the conductive support in the layer structure shown in (1) as shown in FIG. . Further, in the above layer structure, an intermediate layer may be provided between the respective layers, and a surface protective layer may be formed on the uppermost layer.

As the conductive support, copper, aluminum,
A sheet or drum of foil or plate of silver, iron, nickel or the like is used, or polyethylene terephthalate, nylon, polyarylate,
Polymer materials such as polyimide and polycarbonate, insulating materials such as hard paper molded on a drum, sheet-shaped films vacuum-deposited, laminated or electroless plated with these metals, or coated with electrolyte on the sheet surface. The one that has been subjected to a conductive treatment is used.

In the present invention, an undercoat layer can be provided on the conductive support in order to improve the adhesiveness or the electrical characteristics, and the material used for this undercoat layer is aluminum oxide, indium oxide, Metal oxide such as titanium oxide, acrylic resin, methacrylic resin, vinyl chloride resin, vinyl acetate resin, epoxy resin, urethane resin, polyester resin, phenol resin, alkyd resin, polycarbonate resin, silicone resin, melamine resin, polyvinyl formal resin, Polyvinyl butyral resin, polyvinyl alcohol resin, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-maleic anhydride copolymer, vinylidene chloride-acrylonitrile copolymer, styrene-polymer materials such as butadiene copolymer, Ethyl cellulose, carboxy Celluloses such as Le methylcellulose and the like, can be used in combination alone, or two or more kinds. The undercoat layer is formed to have a predetermined film thickness by dissolving the above materials in a suitable solvent and applying the solution on a conductive support. As the coating method, when the conductive support is in a drum shape, a dipping method, a spray method, an extrusion method or a slide hopper method is preferable,
When the conductive support is in the form of a sheet, a gravure coating method, a roll method, an extrusion method or a slide hopper method is preferably adopted.

The charge generating layer of the present invention is a layer containing at least a charge generating substance, and may be applied on the above-mentioned conductive support or the above-mentioned subbing layer, either alone or after being dispersed in a binder. desirable. As the charge generating substance used in the present invention, there are organic pigments as shown in the following representative examples which absorb visible light to generate charges. (1) Phthalocyanine pigments such as metal phthalocyanine, metal-free phthalocyanine, and derivatives thereof (2) Monoazo pigments, polyazo pigments, metal complex salt azo pigments, pyrazolone azo pigments, stilbene azo pigments, thiazole azo pigments and other azo pigments (3) Perylene pigments such as perylene anhydride and perylene imide (4) Squarylium pigment (5) Indigoid pigments such as indigo derivatives and thioindigo derivatives (6) Diphenylmethane pigments, triphenylmethane pigments, xanthene pigments and acridine pigments (7) Quinonimine 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 Pigment 12) benzoquinone and naphthoquinone pigments (13) naphthalimide-based pigments (14) perinone pigments such as bis-benzimidazole derivative

Among the above charge generating substances, phthalocyanine pigments, azo pigments, squaraine pigments and perylene pigments are particularly preferable for achieving the object of the present invention. The particle size is 0.01 μm to 1 for primary particles.
It is preferably μm. As the binder resin for the charge generation layer in the present invention, all known binders such as thermoplastic resins, curable resins and photoconductive resins can be used. Examples of suitable binder resins include, but are not limited to, saturated polyester resins, polyamide resins,
Acrylic resin, ethylene-vinyl acetate copolymer, ion-crosslinked olefin copolymer, styrene-butadiene block copolymer, polycarbonate, vinyl chloride-vinyl acetate copolymer, cellulose ester, thermoplastic resin such as polyimide, epoxy resin, Urethane resin, silicone resin, phenol resin, melamine resin, xylene resin alkyd resin, thermosetting resin such as thermosetting acrylic resin, photocurable resin, electron beam curable resin, poly-N-vinylcarbazole, polyvinylpyrene, It is a photoconductive resin such as polyvinyl anthracene. As a means for dispersing the charge generating substance, a dispersing means such as a sand mill, a ball mill, or an ultrasonic dispersing device can be used by adding the charge generating substance to a solution of an appropriate solvent or binder. As a suitable solvent
1,2-dichloroethane, chloroform, 1,1,1-trichloroethane, dichloromethane, acetone, dioxane, methyl ethyl ketone, tetrahydrofuran, benzene, toluene, xylene, diethyl ether and the like can be mentioned.

The mixing ratio of the charge generating substance and the binder is 10 parts by weight of the binder with respect to 100 parts by weight of the charge generating substance.
~ 500 parts by weight, preferably 30-200 parts by weight. The thickness of the charge generation layer is preferably 0.01 to 10 μm, particularly preferably
It is 0.05 to 2 μm. Examples of the charge transport material used in the charge transport layer of the present invention include hydrazone derivatives, stilbene derivatives, triphenylamine derivatives, triphenylmethane derivatives, pyrazoline derivatives, oxadiazole derivatives,
Examples thereof include indoline derivatives and carbazole derivatives.

In the present invention, examples of the preferred charge transport material include compounds represented by the following general formulas (1) to (10).

[0018]

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[0019]

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In the present invention, the charge transport layer contains at least a binder and methylsiloxane resin particles in addition to the above charge transport material. As the binder, those having high compatibility with the charge transporting substance and having high transparency and insulating property are preferable, and all the binders generally used for electrophotographic photoreceptors can be used. For example, polyester resin, polyethylene resin, polyamide resin, polycarbonate resin, epoxy resin, polyvinyl butyral resin, polymethylmethacrylate resin, etc. may be mentioned.

The charge transport layer of the present invention contains methyl siloxane resin particles or organic resin fine particles having a surface coated with a methyl siloxane resin as shown in FIG.

The organic resin fine particles include, as organic resin materials, polyolefin resin, styrene-acrylonitrile copolymer, nylon resin, acrylic resin, polyvinyl chloride, polyvinyl fluoride, polyvinylidene chloride, rubber, epoxy, polytetrafluoroethylene, Polycarbonate, polystyrene, polyester resin, or cross-linked products thereof, which are obtained by pulverizing or pulverizing these materials at the synthesis stage, are used alone or in combination. The average particle size is preferably 15 μm or less.

There is no particular limitation on the method of coating the surface of these organic resin fine particles with the methylsiloxane resin. For example, an adhesive solution prepared by dissolving the methylsiloxane resin in a solvent is used.
A coating method in which the surface of the organic resin particles is coated with a methylsiloxane resin by spraying in a fluidized system in which the organic resin particles are suspended, or pre-dried organic resin particles and methylsiloxane resin particles are mixed, and this mixture is mixed. A method of adhering methylsiloxane resin particles to the surface of organic resin particles by processing with a general crusher (for example, ball mill, roll mill, ong mill, sand mill, etc.), and placing this mixed powder in a high-speed air stream to collide with the wall surface, etc. The mechanical impact is applied to the particles by the method described above to thereby physically attach and immobilize the methylsiloxane resin particles on the surface of the organic resin fine particles, whereby a high-speed air current impact method or the like can be used. When using dry powder for coating, the particle size of the methyl siloxane resin particles to be coated is smaller than that of the organic resin particles to be coated.
It is desirable to be about 1/10 to 1/4.

In the charge transport layer, 100 to 100 parts by weight of the binder resin is mixed with 20 to 100 parts by weight of methylsiloxane resin particles or organic resin fine particles having a surface coated with methylsiloxane resin.
10 parts by weight (more preferably 30 to 80 parts by weight), and 10 to 60 parts by weight of the charge transport material with respect to a total of 90 parts by weight of the binder resin and the methyl siloxane resin particles or the organic resin fine particles having the surface coated with the methyl siloxane resin. Parts by weight (more preferably 20 to 50 parts by weight). If the charge transport material is too much, it will be crystallized and the sensitivity will be lowered. If it is too little, practical sensitivity will not be obtained. On the other hand, if the amount of the fine particles is too large, voids are generated in the charge transport layer, which causes scumming. In the present invention, the thickness of the charge transport layer is 5 to 50 μm, more preferably 10 to 30 μm.

In the present invention, a protective layer may be provided on the surface if desired. Materials used for the protective layer include melamine resin, polyester resin, silicone resin, urea resin, phenol resin, epoxy resin, alkyd resin, polyimide resin, urethane resin, etc., or a mixture of these resins, and thermosetting of a copolymer. Resins or nylon resins, ethylene-vinyl acetate copolymers, ethylene-vinyl acetate-maleic anhydride copolymers, ethylene-based resins such as ethylene-vinyl acetate-methacrylic acid copolymers, polyvinyl alcohol, cellulose derivatives, etc. It is valid. In addition to these, it is also possible to use those listed for the charge generation layer and the charge transport layer.

[0026]

EXAMPLES The present invention will be described with reference to the following examples, which should not be construed as limiting the invention. Method for evaluating electrophotographic photoconductor sensitivity The sensitivity of electrophotographic photoconductor is measured by a sensitivity measuring instrument for electrophotography (GEN
TEC: measured by Cynthia 30). The measurement conditions are as follows: near-infrared monochromatic light (wavelength 780 nm: intensity 0.01 mW / cm ² )
Charging voltage 5.5KV, dark decay time 10 seconds, light irradiation time 40
It went under the condition of second. The performance to be evaluated is the charged potential Vs (V) immediately after charging, the dark decay rate DD (%) after 10 seconds of charging, the standard sensitivity Eh (V ・ cm ² / erg) of the Electrophotographic Society (surface potential at the time of light irradiation). Divided by half the amount of exposure).

Example 1 10 parts by weight of an alcohol-soluble nylon resin (trademark: CM-8000, manufactured by Toray) was dissolved in 490 parts by weight of ethanol, and the solution was applied to a PET film on which aluminum was vapor-deposited by using a wire bar to obtain about 0.2 μm. To form an undercoat layer. Next, 10 parts by weight of polyvinyl butyral resin (trademark: S-REC BLS, manufactured by Sekisui Kasei) was added to 10 parts by weight of metal-free phthalocyanine (trademark: 8120S, manufactured by Dainippon Ink and Chemicals), and toluene / n-butanol (4: 1) was added as a solvent. 480 parts by weight of the mixed solvent of (1) is added and subjected to a dispersion treatment with a paint conditioner for 2 hours, and the obtained dispersion is applied on the undercoat layer to a thickness of about 0.5 μm using a wire bar, and the temperature is 100 ° C. And dried for 10 minutes to form a charge generation layer. Next, polycarbonate resin (Trademark: TS-2
020, Mitsubishi Gas Chemical Co., Ltd.) 50 parts by weight, compound (7) charge transport material (trademark: T-405, manufactured by Anan) 40 parts by weight, methyl siloxane resin particles (trademark: TSP130, Toshiba Silicon,
10 parts by weight of average particle diameter 3 μm) is dissolved and dispersed in 300 parts by weight of a mixed solvent of toluene / tetrahydrofuran (1: 1), coated on the charge generation layer with an applicator, and dried at 90 ° C. for 10 minutes. A charge transport layer having a thickness of about 25 μm was formed to prepare an electrophotographic photoreceptor. The electrophotographic characteristics were measured, and the results are shown in Table 1.

Example 2 After forming a charge generation layer in the same manner as in Example 1, a polycarbonate resin (trademark: TS-2020, manufactured by Mitsubishi Gas Chemical Co., Inc.)
30 parts by weight, charge transport material of compound (7) (Trademark: T-40
5, manufactured by Annan) 40 parts by weight, methyl siloxane resin particles (trademark: TSP130, manufactured by Toshiba Silicon, average particle diameter 3 μm) 30
Part by weight is dissolved and dispersed in 300 parts by weight of a mixed solvent of toluene / tetrahydrofuran (1: 1), coated on the charge generation layer with an applicator, and dried at 90 ° C for 10 minutes to give a film thickness of about 25
A μm charge transport layer was formed to prepare an electrophotographic photoreceptor. The electrophotographic characteristics were measured, and the results are shown in Table 1.

Example 3 A polycarbonate resin (trademark: TS-2020, manufactured by Mitsubishi Gas Chemical Co., Ltd.) 2 was formed after forming a charge generation layer in the same manner as in Example 1.
0 parts by weight, a charge transport material of the compound (7) (trademark: T-405,
Anan) 10 parts by weight, methyl siloxane resin particles (trademark: TSP130, manufactured by Toshiba Silicon, average particle size 3 μm) 10 parts by weight are mixed with toluene / tetrahydrofuran (1: 1) mixed solvent 120
It was dissolved / dispersed in parts by weight, coated on the charge generation layer with an applicator, and dried at 90 ° C. for 10 minutes to form a charge transport layer having a film thickness of about 25 μm, to prepare an electrophotographic photoreceptor. The electrophotographic characteristics were measured, and the results are shown in Table 1.

Example 4 After forming a charge generation layer in the same manner as in Example 1, a polycarbonate resin (trademark: TS-2020, manufactured by Mitsubishi Gas Chemical Co., Ltd.) 1
50 parts by weight, charge transport material of compound (7) (Trademark: T-40
5, manufactured by Anan) 20 parts by weight, methyl siloxane resin particles (trademark: TSP130, manufactured by Toshiba Silicon, average particle diameter 3 μm) 30
Part by weight is dissolved and dispersed in 600 parts by weight of a mixed solvent of toluene / tetrahydrofuran (1: 1), coated on the charge generation layer with an applicator, and dried at 90 ° C for 10 minutes to give a film thickness of about 25
A μm charge transport layer was formed to prepare an electrophotographic photoreceptor. The electrophotographic characteristics were measured, and the results are shown in Table 1.

Example 5 A polycarbonate resin (Trademark: TS-2020, manufactured by Mitsubishi Gas Chemical Co., Inc.) 90 was prepared after forming a charge generation layer in the same manner as in Example 1.
Parts by weight, a charge transport material of the compound (7) (trademark: T-405,
Anan) 20 parts by weight, methyl siloxane resin particles (trademark: TSP130, Toshiba Silicon, average particle size 3 μm) 90 parts by weight of toluene / tetrahydrofuran (1: 1) mixed solvent 600
It was dissolved / dispersed in parts by weight, coated on the charge generation layer with an applicator, and dried at 90 ° C. for 10 minutes to form a charge transport layer having a film thickness of about 25 μm, to prepare an electrophotographic photoreceptor. The electrophotographic characteristics were measured, and the results are shown in Table 1.

Example 6 Methylsiloxane resin particles of Example 3 (trade name: TSP130,
Toshiba Silicon, average particle diameter 3 μm) 10 parts by weight of methyl siloxane resin particles (trademark: TSP3120, Toshiba Silicon,
An electrophotographic photosensitive member was produced in the same manner as in Example 3 except that 10 parts by weight of the average particle diameter of 12 μm was used. The electrophotographic characteristics were measured, and the results are shown in Table 1.

Example 7 50 parts by weight of polyethylene particles (trademark: LE-1080, manufactured by Sumitomo Seika, 5 μm average particle size) to 10 parts by weight of methylsiloxane resin particles (trademark: TSP105, Toshiba Silicon, average particle size 0.5 μm). Rotor speed by mixing parts and using high-speed air impact method (Nara Machinery, hybridization system)
The treatment was performed at 15000 RPM for 20 minutes to obtain composite particles in which the surface of polyethylene resin particles was coated with methylsiloxane resin particles. An electrophotographic photosensitive member was prepared in the same manner as in Example 3, except that 10 parts by weight of the methylsiloxane resin particles (trade name: TSP130, manufactured by Toshiba Silicon, average particle diameter 3 μm) of Example 3 were replaced with 10 parts by weight of the composite particles. It was made. The electrophotographic characteristics were measured, and the results are shown in Table 1.

Comparative Example 1 10 parts by weight of an alcohol-soluble nylon resin (trademark: CM-8000, manufactured by Toray) was dissolved in 490 parts by weight of ethanol, and the solution was applied to a PET film on which aluminum was vapor-deposited using a wire bar to obtain about 0.2 μm. To form an undercoat layer. Next, 10 parts by weight of polyvinyl butyral resin (trademark: S-REC BLS, manufactured by Sekisui Kasei) was added to 10 parts by weight of metal-free phthalocyanine (trademark: 8120S, manufactured by Dainippon Ink and Chemicals), and toluene / n-butanol (4: 1) was added as a solvent. 480 parts by weight of the mixed solvent was added and dispersed for 2 hours with a paint conditioner, and the resulting dispersion was applied to the undercoat layer with a wire bar to give a dispersion of about 0.5 μm.
And was dried at 100 ° C. for 10 minutes to form a charge generation layer. Next, polycarbonate resin (trademark: TS
-2020: 30 parts by weight of Mitsubishi Gas Chemical Co., Ltd. and 20 parts by weight of the compound (7) charge transport substance (T-405: manufactured by Anan) are dissolved in 150 parts by weight of a mixed solvent of toluene / tetrahydrofuran (1: 1). Dispersed, coated on the charge generation layer with an applicator, and dried at 90 ° C. for 10 minutes to form a charge transport layer having a film thickness of about 25 μm, to prepare an electrophotographic photoreceptor. The electrophotographic characteristics were measured, and the results are shown in Table 1.

Comparative Example 2 A polycarbonate resin (trademark: TS-2020, manufactured by Mitsubishi Gas Chemical Co., Ltd.) was used after forming a charge generation layer in the same manner as in Comparative Example 1.
30 parts by weight, charge transport material (T-405, manufactured by Annan) 10
Part by weight is dissolved and dispersed in 120 parts by weight of a mixed solvent of toluene / tetrahydrofuran (1: 1), coated on the charge generation layer with an applicator, and dried at 90 ° C for 10 minutes to give a film thickness of about 25
An electrophotographic photoreceptor was prepared by forming a charge transport layer having a thickness of μm. The electrophotographic characteristics were measured, and the results are shown in Table 1.

Comparative Example 3 After forming the charge generation layer in the same manner as in Comparative Example 1, 90 parts by weight of a polycarbonate resin (TS-2020: manufactured by Mitsubishi Gas Chemical Co., Ltd.) and a charge transport material (trademark: T-405, manufactured by Anan). 10 parts by weight is dissolved and dispersed in 300 parts by weight of a mixed solvent of toluene / tetrahydrofuran (1: 1), coated on the charge generation layer with an applicator, dried at 90 ° C. for 10 minutes, and a film thickness of about 25 μm is applied. A transport layer was formed to prepare an electrophotographic photosensitive member. The electrophotographic characteristics were measured, and the results are shown in Table 1.

FIG. 4 shows the mixing ratio of the constituent materials in the photoconductor, and Table 1 shows the results of the charging potential, dark decay and sensitivity of the photoconductor.

[0038]

[Table 1]

[0039]

The electrophotographic photoreceptor according to the present invention has an excellent charging potential, a low dark decay rate, and an excellent sensitivity as clearly shown in Table 1. It has excellent sensitivity and is extremely useful in practice for general copiers and laser printers.

[0040]

[Brief description of drawings]

FIG. 1 is an explanatory cross-sectional view showing a configuration of an example of an electrophotographic photosensitive member of the present invention.

FIG. 2 is an explanatory cross-sectional view showing the configuration of an example of the electrophotographic photosensitive member of the present invention.

FIG. 3 Distribution of methylsiloxane resin particles in the charge transport layer of the electrophotographic photoreceptor of the present invention.

[Explanation of symbols]

 1 ── Sheet-shaped substrate 2 ─ ─ Conductive layer 3 ─ ─ Undercoat layer 4 ─ ─ Charge generation layer 5 ─ ─ Charge transport layer 6 ─ ─ Methylsiloxane resin particles

Claims (1)

[Claims] 1. A conductive support, a charge generation layer formed on the conductive support and containing a charge generation substance and a binder resin as main components, and a charge generation layer formed on the charge generation layer. A charge transport layer containing a transport substance, organic resin fine particles and a binder resin as a main component, wherein the organic resin fine particles of the charge transport layer are methyl siloxane resin fine particles or organic resin fine particles having a surface coated with a methyl siloxane resin. , 20 to 100 parts by weight with respect to 100 parts by weight of binder resin (solid content),
An electrophotographic photoconductor characterized by containing 10 to 60 parts by weight of a charge transport material with respect to 90 parts by weight of a total amount of a binder resin and organic resin fine particles.