JPH02236560A - 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, halogen atom, alkyl group, fluorine atom- substd. alkyl group, aryl group, or fluorine atom-substd. aryl group; R11 and R12 denote a hydrogen atom, alkyl group, fluorine atom-substd. alkyl group, aryl group, or fluorine atom-substd. aryl group. 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.

BACKGROUND OF THE INVENTION In recent years, electrophotographic technology has been widely applied in the fields of copying machines, laser beam printers, etc. because it has the advantages of high speed and 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 them, a functionally separated organic laminated photoreceptor in which a charge generation layer that generates charges upon exposure and a charge transport H that transports charges is laminated is superior in terms of electrophotographic properties such as sensitivity, chargeability, and repeated stability. It is excellent, and various proposals have been made and it has not yet been 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.;
Alternatively, 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 photoconductor surface. It limits lifespan.

Various countermeasures 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 Application 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 sufficiently satisfactory, not t or t, but 40,000 yen. There remains the problem that image quality defects occur due to abrasion and scratches on the surface of the photosensitive layer after copying operations of about 50,000 to 50,000 sheets, and in the latter case, after copying operations of about 40,000 to 50,000 sheets, The problem remains that 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 regarding the binder resin of the photosensitive layer, the present inventors found that a polycarbonate resin consisting of repeating units represented by the following general formula (I>) has extremely excellent surface hardness and By using it together with a polycarbonate resin that has lubricity and is composed of repeating units represented by the following general formula (n), the above problems can be solved, namely, image quality defects due to wear and scratches on the surface of the photosensitive layer, and The present inventors have discovered that it is possible to simultaneously eliminate the occurrence of image deletion due to the accumulation of paper dust and the like, and to dramatically improve the lifespan of electrophotographic photoreceptors, leading to the completion of 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 one type of polycarbonate resin consisting of repeating units represented by the following general formula (I>) as a binder resin. or more (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, an alkyl group having 1 to 3 carbon atoms, or a halogen atom) R7 represents an alkyl group or aryl group) and one or more polycarbonate resins consisting of repeating units represented by the following general formula (n) (in the formula, R7 represents an alkyl group or an aryl group).
, R8, R9 and Rsn each represent a hydrogen atom, a halogen atom, an alkyl group, a fluorine atom-substituted alkyl group, an aryl group, or a fluorine atom-substituted aryl group, and Ro
and RI2 each represent a hydrogen atom, an alkyl group, a fluorine atom-substituted alkyl group, an aryl group, a fluorine atom-substituted aryl group, or an atomic group bonded to each other to form a carbon ring. However, at least one of R7, R8, R9, R+o, Rh and R12 represents a fluorine atom, a fluorine atom-substituted alkyl group, or a fluorine atom-substituted aryl group. >> 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 substances 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 metal sheets, and 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 petyral, 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 layer 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, perylene-based, azo-based, anthracene-based,
Organic pigments and dyes such as pyrene, pyrylium salts, and thiapyrylium salts are used.

As the charge transport substance, quinone compounds such as p-penzoquinone, chloranil, promoanil, anthraquinone,
Tetracyanoquinodimethane compound, 2, 4. 7-
Trinitrofluorenone, 2, 4, 5. Fluorenone compounds such as 7-tetranitrofluorenone, fluorenone-9-malononitrile compounds, xanthone compounds, benzophenone compounds, cyanovinyl compounds, electron-withdrawing substances such as ethylene compounds, pyrazoline compounds, hydrazone compounds, oxysilane Zole-based compounds, carbazole-based compounds, arylalkane-based compounds, triphenylamine-based compounds, aryl-substituted ethylene-based compounds, benzidine-based compounds, stilbene-based compounds,
An electron-donating substance such as an anthracene compound or a polymer having a group consisting of such a compound 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).

(In the formula, RI3 and Rl4 are respectively T1 or C)-
h, and Rl5 represents H1, CH3, C2H, or C) In the present invention, the binder resin is represented by the above general formula (I).
A polycarbonate resin consisting of repeating units represented by and (n) 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 the same way that the surface is formed. In particular, it is preferably used as a binder resin when the surface is comprised of a charge transport layer.

The polycarbonate resin composed of repeating units represented by the above 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 the polycarbonate resin represented by the general formula (E) that can be suitably used in the present invention include those having the following repeating units as constituent components.
The polycarbonate resin represented by the general formula (I>) in the present invention can be easily synthesized using a phenolic compound represented by the following general formula (IV) according to a conventional method.

(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 while... ! 2. When using an alkaline aqueous solution such as sodium hydroxide as a binder, the phenol compound, sodium hydroxide, water, methylene chloride, etc. are appropriately mixed, and after introducing phosgun, trimethylamine or triedylamine is used as a catalyst. Polymerization can be carried out by adding tertiary amine compounds such as, sodium hydroxide, and water in appropriate amounts.As a molecular adjustment agent, monofunctional compounds such as phenol and tertiary butylphenol can be phosgenated. It can be added before phosgenation, during phosgenation, 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 18 g Water
250 m. ! ! Methylene chloride 150111Qp-Tertiary butylphenol 0.4 g or more of the substance was charged into a 2I reaction vessel, and while stirring, 40 g of phosgene was blown into it for 2 hours, followed by 0.05 g of triethylamine, 5 g of sodium hydroxide, and 30 g of water. ml was added and polymerization was carried out at 25°C for 4 hours. After polymerization is complete, methylene chloride 400 IF! (), washed with hydrochloric acid, washed with water, and evaporated methylene chloride to obtain about 55 g of polycarbonate resin (average molecular weight: about 30,000) represented by the following structural formula (I-1>) and consisting of repeating units. Obtained.

Synthesis Example 2 Phenolic compound represented by the following structural formula (IV-2) 0.2 mol Sodium hydroxide 18 g Water
250 mN methylene chloride 150 mf) p-tertiary butylphenol 0.49 or more substances,
2. l! was charged into a reaction vessel, and a polymerization reaction was carried out in the same manner as in Synthesis Example 1 to obtain a polycarbonate resin of approximately 589 (average molecular weight approximately 30,000) consisting of repeating units represented by the following structural formula (I-2>). .

Synthesis Example 3 Phenolic compound represented by the following structural formula (IV-3> 0.2 mol Sodium hydroxide 189 Water
25 (} m.Q methylene chloride 150 m.Qp = tertiary butylphenol Charge 0.4 g or more of the substance into the reaction vessel of 2.Il, carry out the polymerization reaction in the same manner as in Synthesis Example 1, and prepare the following appetizer. Polycarbonate resin approximately 609 (
An average molecular weight of about 30,000) was obtained.

Synthesis Example 4 Phenolic compound represented by the following structural formula (IV-4) 0.2 mol Sodium hydroxide 18 g Water
250 mN methylene chloride 150 nlNp-tertiary butylphenol 0.49 or more substances, 2
．． 11, and carried out a polymerization reaction in the same manner as in Synthesis Example 1 to obtain about 63 g (average molecular weight O: about 30,000) of a polycarbonate resin consisting of repeating units represented by the following structural formula (I-4>). Ta.

In the present invention, known polycarbonate resins are used as the polycarbonate resin comprising repeating units represented by the above general formula (I). Usually, those having an average molecular weight in the range of 10,000 to 200,000 are used. Specifically, for example, one in which the next repeating unit is a groove component is exemplified.

In the present invention, the content ratio of the polycarbonate resin represented by the above general formula (E) and the polycarbonate resin represented by the above general formula (n) can be set arbitrarily, but the former: the latter = It is preferable to use the content ratio in the range of 90:1 to 5:95.

In the present invention, examples of fluororesin fine particles include:
Powders of ethylene tetrafluoride polymer, vinylidene fluoride polymer, vinylidene trifluoride chloride polymer, ethylene tetrafluoride-propylene hexafluoride copolymer, carbon fluoride, and the like can be used.

These fluororesin fine particles have an average particle size of 0.1 lM~
Those having a particle size in the range of 5#I are preferred.

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 is in the range of 0.02 to 1. is preferred.

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 the copolymerized polycarbonate resins mentioned above, known binder resins such as polystyrene, polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymers,
Conventionally known thermoplastic resins such as polyvinyl acetal, alkyd resin, acrylic resin, polyacrylonitrile, polycarbonate, polyamide, polyketone, polyacrylamide, butyral resin, polyester, thermosetting resin such as borourethane, epoxy resin, phenol resin, etc. things can be used.

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

The charge transport layer is formed by applying a solution in which the charge transport substance described above and a polycarbonate resin consisting of repeating units represented by the above general formulas (I> and (II)) are dissolved in an appropriate solvent, and then dried. The solvent used to form the charge transport layer is as follows:
A large number of useful organic solvents can be used. 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. Examples include hydrogens, cyclic or linear ethers such as tetrahydrofuran, dioxane, ethylene glycol, and diethyl ether, and mixed solvents thereof.

The thickness of the charge transport layer is 2 to 100 H1, preferably 10
~40#I is set.

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 liquid 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 applied onto the pipe by dip coating, and dried to give a film thickness of 1#. A subbing layer of f was formed. Furthermore, 90 parts by weight of trigonal selenium (manufactured by Xerox Corporation, USA), 10 parts by weight of modified polyvinyl butyral resin, n-
Dispersing a mixture consisting of 300 parts by weight of butanol, adding 2 parts by weight of n-butanol to 1 part by weight of the resulting dispersion, and diluting the solution is applied onto the undercoat layer by dip coating, It was dried to form a charge generation layer with a thickness of 0.31R.

Next (f), N'-diphenyl-N,N'-bis(3-
methylphenyl) -[1.1'-biphenyl]-4
．． 3 parts by weight of 4'-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 (
5 parts by weight of a polycarbonate resin (average molecular weight: about 30,000) consisting of repeating units represented by ff -1 > was added to and dissolved in a solvent containing 40 parts by weight of methylene chloride.

To the obtained solution, 1 part by weight of tetrafluoroethylene polymer fine particles (Luburon [12, manufactured by Daikin Kogyo Kan) was added and dispersed in a sand mill for 48 hours, and the obtained dispersion was spread on the above charge generation layer. The mixture was applied by dip coating and dried to form a charge transport layer having a thickness of 20 μm, thereby producing an electrophotographic photoreceptor consisting of three layers.

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 copies. The surface pencil hardness was investigated. The results are shown in Table 1.

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

Example 4 As a binder resin for the charge transport layer, 5 parts by weight of a polycarbonate resin composed of repeating units represented by the structural formula (I-1) obtained in Synthesis Example 1 and the structural formula (n-4) 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 results are shown in Table 1.

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 following 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, 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, 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 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 (n-3>
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, and evaluated in the same manner. I did this. The results are shown in Table 1.

Example 8 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 (n-3>
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 results are shown in Table 1.

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 (IF-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 maximum of approximately 30,000) consisting of repeating units represented by was evaluated. The result is the first
Shown in the table.

Example 10 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 (II-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 maximum of approximately 30,000) consisting of repeating units represented by 2> was used. , similarly evaluated. The results are shown in Table 1.

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 (I-3) obtained in Synthesis Example 3 and the structural formula (n-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 > was used. was evaluated. The result is the first
Shown in the table.

Example 12 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 (II-4) 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 13 As the binding resin of the charge transport layer, 5 parts of polycarbonate resin consisting of repeating units represented by the structural formula (I-4) obtained in Synthesis Example 4 and the structural formula (II-4) 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 maximum of about 30,000) consisting of repeating units shown in 1) was used. The same evaluation was conducted. The results are shown in Table 1.

Example 14 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-2>
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, and evaluated in the same manner. I did this. The results are shown in Table 1.

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-4> obtained in Synthesis Example 4) and the structural formula (n-3) 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 results are shown in Table 1.

Example 16 As a binding 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 (If-4) 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.

Comparative Example A commercially available polycarbonate resin (manufactured by Teijin ■, Panlite K-1300) was used as the binder resin for the charge transport layer.
An electrophotographic photoreceptor was prepared in the same manner as in Example 1 except that the same portion was used, and evaluation was performed in the same manner. The results are shown in Table 1.

Since a mixture of resins (Table 1) is used and fluororesin fine particles are further dispersed, the formed coating film has extremely excellent surface hardness and surface lubricity. The body has excellent durability, suppresses the occurrence of image defects due to abrasion and scratches on the surface of the photosensitive layer, and at the same time eliminates the occurrence of image fading due to adhesion and accumulation of paper dust etc., dramatically improving the service life.

Patent applicant Fuji Xerox Co., Ltd. Agent
Effects of Patent Attorney Tsuyoshi Watanabe's inventions

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, a halogen atom, an alkyl group, a fluorine atom-substituted alkyl group, an aryl group, or a fluorine atom-substituted aryl group, and R_1_1 and R_1_2 each represents a hydrogen atom, an alkyl group, a fluorine atom-substituted alkyl group, an aryl group, a fluorine atom-substituted aryl group, or an atomic group that combines with each other to form a carbon ring.However,
At least one of R_7, R_8, R_9, R_1_0, R_1_1 and R_1_2 represents a fluorine atom, a fluorine atom-substituted alkyl group, or a fluorine atom-substituted aryl group. ) 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.