JPH02236559A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To form a coated film so as to have excellent surface hardness and surface lubricity by using a mixture composed of polycarbonate resins consisting of two kinds of specific repeating units as a binder resin of a photosensitive layer and further, dispersing the fine particles of fluoroplastic therein. CONSTITUTION:The photosensitive layer contains the polycarbonate resins consisting of the repeating units expressed by formula I and the polycarbonate resins consisting of the repeating units expressed by formula II as the binder resin and further, contains the fine particles of the fluoroplastic. In the formula I, R1 to R4 denote a hydrogen atom, alkyl group or halogen atom; R5 and R6 denote a a hydrogen atom, alkyl group or halogen group. In the formula II, R7 to R10 denote a hydrogen atom, alkyl group or halogen atom; R11 and R12 denote a hydrogen atom, alkyl group or aryl group or an atom group which forms a carbon ring by bonding to each other. The electrophotographic sensitive body which has the photosensitive layer having the high surface hardness and surface lubricity in combination is obtd. in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrophotographic photoreceptor, and more particularly to an electrophotographic photoreceptor using a silicon-containing polycarbonate resin as a binder resin.

2. Description of the Related Art In recent years, electrophotographic technology has been widely used in the fields of copying machines, laser beam printers, etc. because it has the advantage of being able to print at high speed and with high print quality.

As electrophotographic photoreceptors used in these electrophotographic techniques, those using inorganic photoconductive materials such as selenium, selenium-tellurium alloy, selenium-arsenic alloy, and cadmium sulfide are widely known. On the other hand, research on electrophotographic photoreceptors using organic photoconductive materials, which have advantages over electrophotographic photoreceptors using inorganic photoconductive materials in terms of cost and ease of manufacture and disposal, has become active. ing. Among these, functionally separated organic laminated photoreceptors, in which a charge generation layer that generates charges upon exposure and a charge transport layer that transports charges, are stacked are superior in terms of electrophotographic properties such as sensitivity, chargeability, and repeated stability. It is excellent, and various proposals have been made and put into practical use.

Among these organic layered photoreceptors, some have been developed that exhibit sufficient electrophotographic properties as described above.
Durability against external mechanical forces, i.e., problems in which image defects occur due to abrasion or scratches on the surface of the photoreceptor due to direct loads from toner, developer, paper, cleaning members, etc.;
In addition, there are image defects caused by low-resistance substances such as ozone and nitrogen oxides generated by corona discharge, paper dust generated by copy paper, and toner components that adhere and accumulate on the surface of the photoconductor, which can shorten the life of the photoconductor. It is restricted.

Various measures have been considered to solve these problems. For example, methods using polymethyl methacrylate, polyester, polycarbonate resin, etc. as a binder resin for the surface layer of the photoreceptor (Japanese Patent Laid-Open No. 57-4051 Publications, etc.) or those containing a lubricant in the binder resin of the photoreceptor surface layer (Japanese Patent Application Laid-open Nos. 63-2072 and 63-5665)
Publication No. 8) etc. have been proposed.

Problems to be Solved by the Invention However, although these conventionally proposed cases provide electrophotographic photoreceptors with relatively good durability, they are still not fully satisfactory. That is, in the former case, the pencil hardness of the formed coating film remains in the range of HB to H, and therefore the surface hardness of the electrophotographic photoreceptor formed is not sufficiently satisfactory, and is in the range of 40,000 to 50,000. The problem remains that image quality defects occur due to abrasion and scratches on the surface of the photosensitive layer due to copying operations on the order of one sheet.
Furthermore, in the latter case, there remains the problem that after copying approximately 40,000 to 50,000 sheets, image deletion occurs due to the accumulation of deposits on the surface of the photoreceptor. Therefore, it has been desired to develop a binder resin that will prevent the formation of a photosensitive layer having high surface hardness.

The present invention has been made in view of the above-mentioned circumstances, and aims to solve the above-mentioned problems in the conventional technology.

That is, an object of the present invention is to provide an electrophotographic photoreceptor having a photosensitive layer having both high surface hardness and surface lubricity.

Means for Solving the Problems As a result of various studies on the binder resin of the photosensitive layer, the present inventors have found that a polycarbonate resin containing repeating units represented by the following general formula (I>) is extremely excellent. It has both surface hardness and surface lubricity, and can be expressed by the following general formula (
By using it in combination with a polycarbonate resin consisting of repeating units shown in II> and further containing fluorine particles, the above-mentioned problems, namely image quality defects due to abrasion and scratches on the surface of the photosensitive layer, and adhesion accumulation of paper dust, etc. can be solved. The present inventors have discovered that it is possible to simultaneously eliminate the occurrence of image deletion caused by the electrophotographic photoreceptor, and to dramatically improve the life of the electrophotographic photoreceptor, thereby completing the present invention.

The present invention provides an electrophotographic photoreceptor comprising a photosensitive layer provided on a conductive substrate, in which the photosensitive layer contains a polycarbonate resin having a repeating unit J represented by the following general formula (I>) as a binder resin. One or more types (wherein Rl, R2, R3 and R4 each represent a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or a halogen atom, and R5 and R6 each represent a hydrogen atom or a carbon atom) 1 to 4 alkyl or aryl groups) and one or more polycarbonate resins consisting of repeating units represented by the following general formula (II) (in the formula,
R7, R8, R9 and R each represent a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or a halogen atom, and Rh and R12 each represent a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or a halogen atom.
~4 alkyl groups or aryl groups, or atomic groups that combine with each other to form a carbon ring. >> It is characterized by containing fluororesin fine particles.

Hereinafter, the present invention will be explained in detail.

The conductive substrate in the electrophotographic photoreceptor of the present invention includes:
Conductive materials such as aluminum, nickel, chromium, titanium, palladium, indium oxide, tin oxide, graphite, etc. are deposited on metal plates such as aluminum, brass, copper, nickel, and steel, or on plastic sheets.
It is possible to use materials that have been subjected to conductive treatment by coating by sputtering, coating, etc., or materials that have been subjected to conductive treatment such as glass, plastic plates, cloth, and paper.

A photosensitive layer of a dispersed type, a laminated type, etc. is provided on the conductive substrate, and an undercoat layer having a barrier function or an adhesive function may be provided between the photosensitive layer and the conductive substrate as necessary. It's okay. As materials constituting the undercoat layer, resins such as polyvinyl butyral, polyvinyl alcohol, casein, polyamide, cellulose, gelatin, polyurethane, and polyester, and metal oxides such as aluminum oxide can be used.

The photosensitive layer formed on the conductive substrate may have a single structure, or may have a laminated structure in which a charge generation layer and a charge transport layer are separated in function. In the case of a laminated structure, the charge generation layer and the charge transport layer may be stacked in any order.

These photosensitive layers are composed of a coating film in which a charge generating substance, a charge transporting substance, or both are contained in a binder resin.

As charge generating substances, amorphous selenium, crystalline selenium,
Selenium-tellurium alloy, selenium-arsenic alloy, other selenium compounds and alloys, inorganic photoconductors such as zinc oxide and titanium oxide, cyanine-based, squarium-based, anthrone-based, berylene-based, azo-based, anthracene-based,
Organic pigments and dyes such as birene, pyrylium salts, and thiavirylium salts are used.

As the charge transport substance, quinone compounds such as p-penzoquinone, chloranil, promoanil, anthraquinone,
Tetracyanoquinodimethane compounds, 7fluorenol compounds such as 2,4.7-trinitrofluorenone, 2,4,5.7-tetranitrofluorenone, fluorenone-9
- Electron-withdrawing substances such as malononitrile compounds, xanthone compounds, benzophenone compounds, cyanovinyl compounds, ethylene compounds, birazoline compounds, hydrazone compounds, oxazole compounds, carbazole compounds, arylalkane compounds, triphenyl An electron-donating substance such as an amine compound, an aryl-substituted ethylene compound, a benzidine compound, a stilbene compound, an anthracene compound, or a polymer having a group consisting of these compounds in its main chain or side chain is used.

Among these, it is particularly preferable to use a triphenylamine compound represented by the following general formula (I[I).

(In the formula, Ro and R+a each represent H or CH3, and R15 represents To1, CH3, C2H5, or CI.) In the present invention, as the binder resin, the above general formula (I)
A polycarbonate resin consisting of repeating units indicated by and (■) is used. When the photosensitive layer has a laminated structure in which a charge generation layer and a charge transport layer are functionally separated, the polycarbonate resin can be used as a binder resin for either the charge generation layer or the charge transport layer. It is desirable to use it at least in a layer forming the surface. In particular, it is preferable to use it as a binding resin when the surface is composed of a charge transport layer.

The polycarbonate resin composed of repeating units represented by the general formula (I>) used in the present invention preferably has an average molecular weight in the range of 10,000 to 300,000, particularly 20,000 to 200,000.

Specific examples of polycarbonate resins consisting of repeating units represented by the general formula (I>) that can be suitably used in the present invention include those containing the following repeating units as constituent components.

Margin below In the present invention, the polycarbonate resin consisting of repeating units represented by the above general formula (IV>
It can be easily synthesized according to a conventional method using the phenolic compound shown below.

(In the formula, R1 to R6 have the same meanings as described above.) Specifically, phosgene is introduced into the phenolic compound using pyridine or an aqueous alkaline solution as an acid binder in the presence of a methylene chloride solvent. It can be produced by carrying out a reaction. When using an alkaline aqueous solution such as sodium hydroxide as an acid binder,
After mixing appropriate amounts of the phenolic compound, sodium hydroxide, water, methylene chloride, etc., and introducing phosgene,
Polymerization can be carried out by adding a third-handling amine compound such as trimethylamine or triethylamine as a catalyst, as well as sodium hydroxide and water as appropriate.As a molecular weight control agent,
A method can be adopted in which a monofunctional compound such as phenol or p-tertiary butylphenol is added before, during, or after phosgenation. Next, a typical manufacturing example will be shown.

Synthesis Example 1 Phenolic compound represented by the following structural formula (IV-1) 0.2 mol Sodium hydroxide 189 Water
250ml! Methylene chloride 150p - tertiary butylphenol 0.4g or more of the substance was charged into a reaction vessel of 21, and while stirring, 40g of phosgene was added to it.
g for 2 hours, and then added 0.0 g of triethylamine. 05
g, 5 g of sodium hydroxide, and 30 mN of water were added.
Polymerization was carried out at 5°C for 4 hours. After the polymerization was completed, 400 d of methylene chloride was added to dilute the mixture and washed with hydrochloric acid.
After washing with water, methylene chloride is evaporated and the following structural formula (I-
About 55 cJ (average molecular weight: about 30,000 cJ) of polycarbonate resin consisting of repeating units represented by 1> was obtained.

Synthesis Example 2 Phenolic compound represented by Mizozo formula (IV-2) below 0.2 mol Sodium hydroxide IAG water
250 mg methylene chloride 150 tertiary butylphenol 0.49 or more substances were charged into a 2 g reaction vessel, and a polymerization reaction was carried out in the same manner as in Synthesis Example 1 to obtain the following structural formula (I-2>). About 58 g of polycarbonate resin (average molecular weight: about 30,000) consisting of the shown repeating units was obtained.

Synthesis Example 3 Phenolic compound represented by the following structural formula (IV-3) 0.2 mol Sodium hydroxide 18 g Water
250 m. llMedylene chloride 150 mΩp-tertiary butylphenol Substances of 0.49 or more,
A 2 g reaction vessel was charged and a polymerization reaction was carried out in the same manner as in Synthesis Example 1 to obtain a polycarbonate resin of approximately 6 (IJ) (average molecular weight approximately 30,000) consisting of repeating units represented by the following structural formula (I-3). 1 q.

Synthesis Example 4 Phenolic compound represented by the following structural formula (IV-4) 0.2 mol Sodium hydroxide 18 water
250 mu methylene chloride 15() ml! p1 3rd
0.4 g or more of class butylphenol was charged into a 2 g reaction vessel, and a polymerization reaction was carried out in the same manner as in Synthesis Example 1 to produce a polycarbonate resin consisting of repeating units represented by the following structural formula (I-4>). 60 g (average molecular weight of about 30,000) was obtained.

In the present invention, as the polycarbonate resin consisting of repeating units represented by general formula (n) used together with the polycarbonate resin consisting of repeating units represented by general formula (1), known ones are used. Usually, those having an average molecular side in the range of 10,000 to 200,000 are used. Specifically, examples include those in which the following repeating units are constituent components.

In the present invention, the content ratio of the polycarbonate resin consisting of repeating units represented by the general formula (I>) and the polycarbonate resin consisting of repeating units represented by the general formula (n) can be arbitrarily set, but Former: latter =
The ratio is preferably in the range of 90:10 to 5:95.

In the present invention, the fluororesin fine particles include, for example, tetrafluoroethylene polymer, vinylidene fluoride polymer,
Powders of vinylidene chloride trifluoride clear polymer, tetrafluoroethylene hexafluoropropylene copolymer, carbon fluoride, and the like can be used.

These fluororesin fine particles have an average particle size of 0.1 μm to 5 μm.
Preferably, the particles have a particle size in the medium range.

In the present invention, the mixing ratio of the fluororesin fine particles to the binder resin can be set arbitrarily, but the weight ratio of the fluororesin fine particles to the binder resin must be in the range of 0.02 to 1. is preferable.

In the present invention, when the photosensitive layer has a laminated structure, the charge generation layer is formed by applying a coating solution obtained by dispersing or dissolving the above charge generation substance and binder resin in a suitable solvent, and drying. be able to. As a binder resin,
In addition to polycarbonate resins consisting of repeating units represented by general formulas (E) and (N) above, known binder resins such as polystyrene, polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymers , polyvinyl acetal, alkyd resin, acrylic resin, polyacrylonitrile, polycarbonate, polyamide,
Conventionally known resins can be used, such as thermoplastic resins such as polyketone, polyacrylamide, butyral resin, and polyester, and thermosetting resins such as polyurethane, epoxy resin, and phenol resin.

The thickness of the charge generation layer is usually set to 0.05 to 40 μs, preferably 0.05 to 25/jJ.

Further, the charge transport layer can be formed by applying a solution in which the above-mentioned charge transport substance and the above-mentioned copolymerized polycarbonate resin are dissolved in a suitable solvent and drying the solution. Many useful organic solvents can be used as the solvent used to form the charge transport layer. Typical examples include aromatic hydrocarbons such as benzene, toluene, xylene, and chlorobenzene, ketones such as acetone and 2-butanone, and halogenated aliphatic carbons such as methylene chloride, chloroform, and ethylene chloride. Hydrogens, tetrahydrofuran, dioxane, ethylene glycol, cyclic or linear ethers such as diethyl ether, and mixed solvents thereof can be commercially available.

The thickness of the charge transport layer is set to 2 to 100/ffl, preferably 10 to 40 u1.

Example Hereinafter, the present invention will be specifically explained with reference to Examples.

Example 1 An aluminum pipe was used as a conductive substrate, and a coating solution consisting of 10 parts by weight of alcohol-soluble polyamide resin, 150 parts by weight of methanol, and 40 parts by weight of water was dip-coated onto the pipe and dried to give a film thickness of 1JJ! A subbing layer of I1 was formed. Furthermore, trigonal selenium (manufactured by Xerox Company, USA)
A mixture consisting of 90 parts by weight, 10 parts by weight of modified polyvinyl butyral resin, and 300 parts by weight of n-butanol was dispersed, and 2 parts by weight of n-butanol was added to 1 part by weight of the resulting dispersion to dilute the liquid. It was coated on the above-mentioned 8 sublayers by a coating method and dried to form a charge generation layer having a thickness of 0.3jffi.

Next, N,N'-diphenyl-N,N'-bis(3-methylphenyl)-[1,1'-biphenyl]-4.4
3 parts by weight of '-diamine, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-1) obtained in Synthesis Example 1, and the structural formula (Ir-
5 parts by weight of a polycarbonate resin (average molecular weight: approximately 30,000) consisting of repeating units represented by 1> were added to and dissolved in a solvent containing 40 parts by weight of methylene chloride.

Tetrafluoroethylene polymer resin fine particles (
Add 1 part by weight of LeBron Shiichi 2 (manufactured by Daikin Industries),
Dispersion was carried out in a sand mill for 48 hours, and the resulting dispersion was
It is applied by dip coating onto the above charge generation layer and dried to a film thickness of 20.
An electrophotographic photoreceptor consisting of three layers was prepared by forming an IIM charge transport layer.

The electrophotographic photoreceptor produced as described above was installed in a copying machine equipped with a blade cleaning member, and the cost was 100,000 yen.
We investigated the occurrence of image defects due to abrasion and scratches on the surface of the electrophotographic photoreceptor, the amount of surface abrasion, and the occurrence of image deletion under high temperature and high humidity environments when copying 0 sheets. Furthermore, the surface pencil hardness was investigated. The results are shown in Table 1.

Example 2 As a binder resin for the charge transport layer, 7 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-1) obtained in Synthesis Example 1 and the structural formula (n-1) were used.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1 above, except that a mixture with 3 parts by weight of a polycarbonate resin (average molecular weight approximately 30,000) consisting of repeating units represented by > was used. was evaluated. The first result is
Shown in the table.

Example 3 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-1) obtained in Synthesis Example 1 and the structural formula (II-2) were used.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight: approximately 30,000) consisting of repeating units represented by was used. We conducted an evaluation. The result is the first
Shown in the table.

Example 4 As a binder resin for the charge transport layer, 7 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-1) obtained in Synthesis Example 1 and the structural formula (II-2) were used.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 3 parts by weight of a polycarbonate resin (average molecular weight: approximately 30,000) consisting of repeating units represented by was used. We conducted an evaluation. The result is the first
Shown in the table.

Example 5 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-2> obtained in Synthesis Example 2) and the structural formula (II-1) were used.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1 above, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight: approximately 30,000) consisting of repeating units represented by > was used. was evaluated. The result is the first
Shown in the table.

Example 6 As a binder resin for the charge transport layer, 7 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-2) obtained in Synthesis Example 2 and the structural formula (II-1) were used.
) An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 3 parts by weight of a polycarbonate resin (average molecular weight approximately 30,000) consisting of repeating units represented by was evaluated. The results are shown in Table 1.

Example 7 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-2) obtained in Synthesis Example 2 and the structural formula (II-2) were used.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1 above, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight, approximately 30,000) consisting of repeating units represented by > was used. It was prepared and evaluated in the same manner. The result is the first
Shown in the table.

Example 8 As a binder resin for the charge transport layer, polycarbonate resin 1@old part consisting of repeating units represented by the structural formula <I-2> obtained in Synthesis Example 2 and the structural formula (II-2)
An electrophotographic photoreceptor was prepared in the same manner as in Example 1 above, except that a mixture with 3 parts by weight of a polycarbonate resin (average molecular weight approximately 30,000) consisting of repeating units represented by > was used. was evaluated. The result is the first
Shown in the table.

Example 9 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-3> obtained in Synthesis Example 3) and the structural formula (I-3) were used.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1 above, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight approximately 30,000) consisting of repeating units represented by 1> was used. Evaluation was conducted in the same manner. The results are shown in Table 1.

Example 10 As a binder resin for the charge transport layer, 7 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (II-3) obtained in Synthesis Example 3 and Moeki structural formula (II-1) were used.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 3 parts by weight of a polycarbonate resin (average molecular weight: approximately 30,000) consisting of repeating units represented by was used. We conducted an evaluation. The result is the first
Shown in the table.

Example 11 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (II-2) obtained in Synthesis Example 3 and the structural formula (II-2) were used.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1 above, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight: approximately 30,000) consisting of repeating units represented by > was used. was evaluated. The result is the first
Shown in the table.

Example 12 As a binder resin for the charge transport layer, 7 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (E-3) obtained in Synthesis Example 3 and the structural formula (n-2) were used.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 3 parts by weight of a polycarbonate resin (average molecular weight approximately 30,000) consisting of repeating units represented by was used. We conducted an evaluation. The results are shown in Table 1.

Example 13 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-4> obtained in Synthesis Example 4) and the structural formula (n-1>
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecule maximum of 30,000) consisting of repeating units represented by was used. We conducted an evaluation. The results are shown in Table 1.

Example 14 As the binder resin of the charge transport layer, 7 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-4> obtained in Synthesis Example 4) and the structural formula (II-1) were used.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1 above, except that a mixture with 3 parts by weight of a polycarbonate resin (average molecular weight approximately 30,000) consisting of repeating units represented by > was used. was evaluated. The result is the first
Shown in the table.

Example 15 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I[-2) obtained in Synthesis Example 4 and the structural formula (I[-2
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a mixture with 5 parts by weight of a polycarbonate resin (average molecular weight: approximately 30,000) consisting of repeating units represented by was used. We conducted an evaluation. The result is the first
Shown in the table.

Example 16 As a binder resin for the charge transport layer, 7 parts by weight of a polycarbonate resin consisting of repeating units represented by the structural formula (I-.4) obtained in Synthesis Example 4 and the structural formula (II-.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1 above, except that a mixture with 3 parts by weight of a polycarbonate resin (average molecular weight approximately 30,000) consisting of repeating units shown in 2) was used. The same evaluation was conducted. The results are shown in Table 1.

Comparative Example An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that 10 parts by weight of a commercially available polycarbonate resin (Teijin T & Wooden Co., Ltd., Panlite κ-1300) was used as the binder resin for the charge transport layer. was prepared and evaluated in the same manner.

The results are shown in Table 1.

Table 1: Effects of the Invention In the present invention, as the binder resin of the photosensitive layer, a polycarbonate resin consisting of a repeating medium represented by the above general formula (I>) and a repeating unit represented by the above general formula (n) are used. Because it is made by using a polycarbonate resin mixture and further dispersing fluororesin fine particles, the formed coating film has extremely excellent surface hardness and surface lubricity.
Therefore, the electrophotographic photoreceptor of the present invention has excellent durability and
The occurrence of image defects due to abrasion and scratches on the surface of the photosensitive layer is suppressed, and at the same time, the occurrence of image deletion due to adhesion and accumulation of paper dust etc. is eliminated, resulting in a dramatic improvement in image quality.

Patent applicant Fuji Xerox Co., Ltd. Agent
Patent attorney Tsuyoshi Watanabe

Claims (3)

[Claims] (1) In an electrophotographic photoreceptor comprising a photosensitive layer provided on a conductive substrate, the photosensitive layer contains one or more polycarbonate resins consisting of repeating units represented by the following general formula (I) as a binder resin. Above ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (I) (In the formula, R_1, R_2, R_3 and R_4 each represent a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or a halogen atom, and R_5 and R_6 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an aryl group, respectively. etc.▼(II) (In the formula, R_7, R_8, R_9 and R_1_0 each represent a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or a halogen atom, and R_1_1 and R_1_2 are
Each represents a hydrogen atom, an alkyl group or aryl group having 1 to 4 carbon atoms, or an atomic group bonded to each other to form a carbon ring. ) and further contains fluororesin fine particles. (2) The content ratio of the polycarbonate resin consisting of the repeating units represented by the above general formula (I) and the polycarbonate resin consisting of the repeating units represented by the above general formula (II) is from 90:10 to 5:95. An electrophotographic photoreceptor according to claim 1, characterized in that: (3) The weight ratio of the fluororesin fine particles to the binder resin is
The electrophotographic photoreceptor according to claim 1, which has a molecular weight of 0.02 to 1.