JPH1020523A - Electrophotographic photoreceptor, process cartridge and electrophotographic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily produce an electrophotographic photoreceptor having high mechanical strength while keeping solvent cracking resistance and having satisfactory resistance to electricity due to direct electrification by incorporating a specified polymer and a diphenoquinone compd. into the surface layer of an electrophotographic photoreceptor. SOLUTION: This electrophotographic photoreceptor has a photosensitive layer on the electrically conductive substrate and contains a polymer having structural units represented by formula I and a diphenoquinone compd. represented by formula II in the surface layer. In the formula I, X is -CR13 R14 -, optionally substd. 5-11C 1,1-cycloalkylene, 2-10C α,ω-alkylene, a single bond, -O-, -S-, -SO- or -SO2 -, each of R1 -R12 is H, halogen, alkylene, etc., and (n) is an integer. In the formula II, each of R15 -R18 is H, alkyl, aryl, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic photoreceptor, a process cartridge and an electrophotographic apparatus having the electrophotographic photoreceptor, and more particularly, to an electrophotographic photoreceptor having a surface layer containing a specific resin and a charge transport material. And a process cartridge and an electrophotographic apparatus having the electrophotographic photosensitive member.

[0002]

2. Description of the Related Art An electrophotographic method is disclosed in U.S. Pat.
As shown in JP-A No. 1 (1993), a photoconductive material comprising a support coated with an insulating substance is used in which the electric resistance changes in accordance with the amount of irradiation received during image exposure, and in a dark place. The basic characteristics required of an electrophotographic photoreceptor using this photoconductive material are (1) that it can be charged to an appropriate potential in a dark place, (2) that the potential is less dissipated in a dark place, and (3) And (3) quickly dissipating the charge by light irradiation.

[0003] Conventionally, selenium,
Inorganic photoreceptors having a photosensitive layer mainly containing an inorganic photoconductive compound such as zinc oxide and cadmium sulfide have been widely used. However, these satisfies the conditions (1) to (3), but are not necessarily satisfactory in thermal stability, moisture resistance, durability and productivity.

In order to overcome the disadvantages of inorganic photoconductors, electrophotographic photoconductors containing various organic photoconductive compounds as main components have been actively developed in recent years. For example, US Pat.
No. 851 discloses a photoreceptor having a charge transport layer containing triallylpyrazolin, and US Pat. No. 3,871,880 discloses a charge generating layer comprising a derivative of perylene pigment and
Photoreceptors comprising a charge transport layer comprising a condensate of propylene and formaldehyde are known.

Further, the organic photoconductive compound can freely select the photosensitive wavelength range of the electrophotographic photosensitive member depending on the compound.
JP-A Nos. 2754 and 56-167759 disclose substances exhibiting high sensitivity in the visible region, and JP-A-57-19576 and JP-A-61-22.
No. 8453 discloses a compound having sensitivity up to the infrared region.

[0006] Of these materials, those exhibiting sensitivity in the infrared region are used in laser beam printers (hereinafter abbreviated as LBPs) and LED printers, which have been remarkably advanced in recent years, and the demand frequency thereof is increasing.

Electrophotographic photoreceptors using these organic photoconductive compounds are used as function-separated type photoreceptors in which a charge transport layer and a charge generation layer are laminated in order to satisfy both electrical and mechanical properties. In many cases. On the other hand, it is needless to say that the electrophotographic photoreceptor is required to have sensitivity, electrical characteristics, and even optical characteristics according to the electrophotographic process applied.

Particularly, in the case of an electrophotographic photoreceptor that is used repeatedly, an external electric or mechanical force such as corona or direct charging, image exposure, toner development, transfer step and surface cleaning is directly applied to the electrophotographic photoreceptor surface. For,
Durability against them is also required.

Specifically, electrical deterioration due to ozone and nitrogen oxides during charging, mechanical deterioration in which the surface is worn or scratched due to discharge during charging, and rubbing of the cleaning member, and electrical deterioration Durability is required.

[0010] The electrical deterioration is particularly problematic in that carriers stay in a portion irradiated with light and a potential difference is generated from a portion not irradiated with light, and this phenomenon occurs as a photo memory.

[0011] Unlike an inorganic photoreceptor, an organic photoreceptor, which is often soft in material, is inferior in durability against mechanical deterioration and is particularly demanded to improve durability.

Various attempts have been made to satisfy the durability characteristics required for the photoreceptor as described above.

As a resin often used for the surface layer and having good abrasion and electric properties, a polycarbonate resin having bisphenol A as a skeleton has been attracting attention. However, not all of the above-mentioned problems can be solved, and the following problems cannot be solved. It has such problems.

(1) It has poor solubility and shows good solubility only in a part of halogenated aliphatic hydrocarbons such as dichloromethane and 1,2-dichloroethane. In addition, since these solvents have a low boiling point, they have low solubility. When a photoreceptor is manufactured using a coating solution prepared with the above solvent, the coated surface is likely to be whitened. It also takes time to control the solid content of the coating liquid.

(2) Solvents other than halogenated aliphatic hydrocarbons are partially soluble in tetrahydrafuran, dioxane, cyclohexanone or a mixed solvent thereof, but the solution gels in a few days. Inferior aging,
It is not suitable for photoconductor production.

(3) Further, even if the above formulas (1) and (2) are improved, solvent cracks are liable to occur in the polycarbonate resin having bisphenol A as a skeleton.

(4) In addition, in the case of a conventional polycarbonate resin, the coating formed of the resin does not have lubricity, so that the photosensitive member is easily damaged, and the cleaning setting for reducing the abrasion amount of the electrophotographic photosensitive member is not sufficient. In some cases, an image defect such as toner fusion occurs, or cleaning failure occurs due to early deterioration of the cleaning blade.

For the solution stability mentioned in the above (1) and (2), use of a polycarbonate Z resin having a bulky cyclohexylene group as a structural unit of the polymer, or copolymerization with bisphenol Z or bisphenol C, etc. Has been solved by

Solvent cracks can also be solved by using a siloxane-modified polycarbonate or an ether-modified polycarbonate, as disclosed in JP-A-6-51544 and JP-A-6-75415. . However, compared to conventional polycarbonate resins, these modified polycarbonates have a structure that has flexibility against internal stress in the polymer in order to prevent solvent cracks, and as a result, the mechanical There was a disadvantage that the strength was reduced.

Further, in recent years, a direct charging system disclosed in JP-A-57-17826 and JP-A-58-40566, in which a voltage is applied directly to a charging member and a charge is applied to an electrophotographic photosensitive member. Is becoming mainstream.

This is a method in which a roller-shaped charging member made of a conductive rubber or the like is brought into direct contact with an electrophotographic photosensitive member to apply an electric charge. The scorotron generates a significantly smaller amount of ozone than a scorotron or the like. While about 80% of the current flowing through the charger flows through the shield, it is wasted, whereas direct charging has the advantage that it is very economical without this waste.

However, direct charging has a disadvantage that charging stability is very poor because of charging by discharge according to Paschen's rule. As a countermeasure, a so-called AC / DC charging method in which an AC voltage is superimposed on a DC voltage has been devised (Japanese Patent Application Laid-Open No. 63-149668).

Although this charging method has improved the stability during charging, the amount of discharge on the surface of the electrophotographic photosensitive member is greatly increased due to the superposition of AC, so that the amount of scraping of the electrophotographic photosensitive member increases. A new drawback has arisen, requiring not only mechanical strength but also electrical strength.

[0024]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems in the case where a conventional polycarbonate resin is used as a surface layer, to have high mechanical strength while having solvent cracking resistance, and to have resistance to direct charging. An object of the present invention is to provide an electrophotographic photosensitive member which has good electric characteristics and is easy to manufacture, and a process cartridge and an electrophotographic apparatus having the electrophotographic photosensitive member.

[0025]

That is, the present invention provides an electrophotographic photosensitive member having a photosensitive layer on a conductive support, wherein the surface layer of the electrophotographic photosensitive member is represented by the following formula (1). An electrophotographic photoreceptor comprising a polymer having units and a diphenoquinone-based compound represented by the following formula (2).

[0026]

Embedded image (Wherein, X is -CR ₁₃ R ₁₄ - (R ₁₃ and R ₁₄ are each independently a hydrogen atom, a trifluoromethyl group, an alkyl group or an aryl group having 6 to 12 carbon atoms having 1 to 6 carbon atoms) ,
An optionally substituted 1,1-cycloalkylene group having 5 to 11 carbon atoms, an α, ω-alkylene group having 2 to 10 carbon atoms, a single bond, —O—, —S—, —SO— or —SO ₂ -. R _{1 to} R ₁₂ are each independently a hydrogen atom, a halogen atom, an optionally substituted alkyl group, an aryl group or an alkylene group, and n is an integer. )

[0027]

Embedded image (In the formula, R ₁₅ to R ₁₈ each independently represent a hydrogen atom, an alkyl group, an aralkyl group or an aryl group. In addition, R ₁₅
And R ₁₇ and R ₁₆ and R ₁₈ may be closed. However, R ₁₅
To R ₁₈ are not hydrogen atoms at the same time. Further, the present invention is a process cartridge and an electrophotographic apparatus having the electrophotographic photosensitive member.

The electrophotographic photoreceptor of the present invention can provide particularly excellent solvent crack resistance, mechanical strength, and the like by selecting a combination of a specific resin and a charge transporting material as the resin forming the surface layer and the charge transporting material. It also has good resistance to AC charging and good electrophotographic properties.

[0029]

DETAILED DESCRIPTION OF THE INVENTION In the above formulas (1) and (2), halogen atoms include fluorine, chlorine and bromine atoms, and alkyl groups include methyl, ethyl and propyl. Examples of the alkylene group include a methylene group, an ethylene group and an i-propylene group, examples of the cycloalkylene group include a cyclopentylene group, a cyclohexylene group and a cyclooctylene group, and examples of the aryl group include a phenyl group. , Naphthyl group and anthryl group and the like, and aralkyl groups include benzyl group, phenethyl group and tolyl group,
Examples of the substituent which these may have include the above-described halogen atom, alkyl group, aryl group, and aralkyl group.

Specific examples of the structural unit (formula (1)) of the polyarylate resin used in the present invention are shown in Table 1, but are not limited thereto.

[0031]

[Table 1]

[0032]

[Table 2]

The polymer having the structural unit represented by the formula (1) used in the present invention may be a mixture of terephthalic acid chloride and isophthalic acid chloride in order to increase the solubility of the bisphenol represented by the following formula (6). It can be synthesized by performing interfacial polymerization by stirring in a solvent / water system under an alkaline condition.

The ratio of terephthalic acid chloride to isophthalic acid chloride is determined in consideration of the solubility of the polymer, and is not defined. However, any chloride is 30 mol
Care must be taken when the content is less than 10% because the solubility of the synthesized polymer is extremely reduced. Usually, it is preferable to synthesize at a ratio of 1/1.

[0035]

Embedded image (Wherein, X is -CR ₁₃ R ₁₄ - (R ₁₃ and R ₁₄ are each independently a hydrogen atom, a trifluoromethyl group, an alkyl group or an aryl group having 6 to 12 carbon atoms having 1 to 6 carbon atoms) ,
An optionally substituted 1,1-cycloalkylene group having 5 to 11 carbon atoms, an α, ω-alkylene group having 2 to 10 carbon atoms, a single bond, —O—, —S—, —SO— or —SO ₂ -. R _{1 to} R ₈ are each independently a hydrogen atom, a halogen atom, an alkyl group, an aryl group or an alkylene group which may be substituted. In the electrophotographic photoreceptor of the present invention, even if the polymer is composed of the same structural unit represented by the formula (1), the polymer may be composed of two or more different types of structural units represented by the formula (1). It may be a polymer.

Preferable examples include structural unit examples 1, 2 and 7. In the case of a polymer composed of the same structural unit, a polymer composed of structural unit 1 is particularly preferred, and two or more types of the structural unit are preferred. In the case of a copolymer composed of different kinds of structural units represented by the formula (1), structural unit examples 1 and 2
Is particularly preferred.

Examples of the diphenoquinone compound represented by the formula (2) are shown below. Among these, particularly preferred examples include the following formulas (4) and (5).

[0038]

Embedded image

In the electrophotographic photoreceptor of the present invention, one diphenoquinone-based compound represented by the formula (2) may be used, or two or more diphenoquinone-based compounds may be used in combination.

Hereinafter, the structure of the electrophotographic photosensitive member used in the present invention will be described.

The electrophotographic photoreceptor of the present invention may be a single layer type in which the photosensitive layer contains a charge transport material and a charge generation material in the same layer, or a laminated type in which the charge transport layer and the charge generation layer are separated. Although good, the laminated type is preferable in terms of electrophotographic characteristics.

The conductive support to be used may be any one having conductivity, such as a metal such as aluminum or stainless steel.
Alternatively, metal, paper, plastic, or the like provided with a conductive layer may be used, and examples of the shape include a sheet shape and a cylindrical shape.

When an image input such as LBP is a laser beam, a conductive layer may be provided for the purpose of preventing interference fringes due to scattering or covering a scratch on the support. This can be formed by dispersing conductive powder such as carbon black and metal particles in a binder resin. The thickness of the conductive layer is 5
４０40 μm is preferable, and more preferably 10-30 μm
It is.

An intermediate layer having an adhesive function is provided thereon. Examples of the material for the intermediate layer include polyamide, polyvinyl alcohol, polyethylene oxide, ethyl cellulose, casein, polyurethane, and polyether urethane. These are applied by dissolving in an appropriate solvent.
The thickness of the intermediate layer is preferably from 0.05 to 5 μm, more preferably from 0.3 to 1 μm.

The charge generation layer is formed on the intermediate layer.
Examples of the charge generation material used in the present invention include selenium-tellurium, pyrylium, thiapyrylium dyes, phthalocyanine, anthantrone, dibenzapyrene quinone, trisazo, cyanine, disazo, monoazo, indigo, quinacridone, and asymmetric quinocyanine pigments. Can be In the case of the function-separated type, the charge generating layer is formed by mixing the charge generating substance with a binder resin and a solvent in an amount of 0.3 to 4 times the amount of a homogenizer, an ultrasonic dispersion, a ball mill, a vibration ball mill, a sand mill, an attritor, a roll mill, and a liquid collision type high speed. It is well dispersed by a method such as a dispersing machine, and is formed by applying and drying a dispersion. The thickness of the charge generation layer is preferably 5 μm or less, more preferably 0.1 to 2 μm.

The charge transport layer is mainly formed by applying and drying a paint in which a charge transport material and a binder resin are dissolved in a solvent. The charge transport material used is a diphenoquinone-based compound represented by the formula (2), and the binder resin used is a polyarylate represented by the formula (1).

These are combined with 0.5 to 2 times the amount of the binder resin, applied and dried to form a charge transport layer. The thickness of the charge transport layer is preferably from 5 to 40 μm, more preferably from 15 to 30 μm.

FIG. 1 shows a schematic configuration of an electrophotographic apparatus having a process cartridge having the electrophotographic photosensitive member of the present invention.

In the figure, reference numeral 1 denotes a drum-shaped electrophotographic photosensitive member of the present invention, which is driven to rotate around a shaft 2 at a predetermined peripheral speed in a direction indicated by an arrow. The photoreceptor 1 rotates during the rotation process.
The peripheral surface is uniformly charged with a predetermined positive or negative potential by the primary charging means 3, and then receives image exposure light 4 from an image exposure means (not shown) such as slit exposure or laser beam scanning exposure. Thus, an electrostatic latent image is sequentially formed on the peripheral surface of the photoconductor 1.

The formed electrostatic latent image is then developed.
The toner-developed image developed by the toner image is transferred from a paper supply unit (not shown) between the photoconductor 1 and the transfer unit 6 in synchronization with the rotation of the photoconductor 1 and fed to a transfer material 7 fed therefrom. The image is sequentially transferred by the transfer unit 6.

The transfer material 7 having undergone the image transfer is separated from the surface of the photoreceptor, introduced into the image fixing means 8 and subjected to image fixing, thereby being printed out of the apparatus as a copy.

The surface of the photoreceptor 1 after the image transfer is cleaned and cleaned by removing the untransferred toner by the cleaning means 9, and further, the pre-exposure light 10 from the pre-exposure means (not shown).
Is used for image formation repeatedly after the charge removal processing. When the primary charging unit 3 is a contact charging unit using a charging roller or the like, the pre-exposure is not necessarily required.

In the present invention, a plurality of components such as the above-described electrophotographic photosensitive member 1, primary charging means 3, developing means 5 and cleaning means 9 are integrally connected as a process cartridge. This process cartridge may be configured to be detachable from a main body of an electrophotographic apparatus such as a copying machine or a laser beam printer. For example, at least one of the primary charging unit 3, the developing unit 5, and the cleaning unit 9 is integrally supported together with the photoreceptor 1 to form a cartridge, which can be attached to and detached from the apparatus main body using a guide unit such as a rail 12 of the apparatus main body. Process cartridge 1
It can be 1.

When the electrophotographic apparatus is a copying machine or a printer, the image exposure light 4 is read and transmitted from the original, or the original is read by a sensor and converted into a signal, and the exposure is performed according to the signal. Laser beam scanning,
Light emitted by driving the LED array, driving the liquid crystal shutter array, and the like.

On the other hand, when used as a facsimile printer, the image exposure light 4 becomes exposure light for printing received data. FIG. 2 is a block diagram showing an example of this case.

The controller 14 controls the image reading unit 13 and the printer 22. The entire controller 14 is controlled by the CPU 20. The read data from the image reading unit 13 is transmitted to the partner station through the transmission circuit 16. Data received from the partner station is sent to the printer 22 through the receiving circuit 15. Predetermined image data is stored in the image memory. The printer controller 21 controls the printer 22. 17 is a telephone.

The image received from the line 18 (image information from a remote terminal connected via the line) is demodulated by the receiving circuit 15 and then decoded by the CPU 20 to be sequentially stored in the image memory 19. Is done. When the image of at least one page is stored in the memory 19, the CPU 20 performs image recording of the page. The CPU 20 reads out the image information of one page from the image memory 19, and Sends out image information. The printer controller 21
When receiving one page of image information from the CPU 20, the printer 22 is controlled to record image information of the page. The CPU 20 is receiving the next page during recording by the printer 22.

Thus, the reception and recording of the image are performed.

The electrophotographic photosensitive member of the present invention can be used not only for an electrophotographic copying machine but also for a laser beam printer,
It can be widely used in electrophotographic applications such as RT printers, LED printers, liquid crystal printers, and laser plate making.

The following is a description of the embodiment. The middle part in the examples indicates parts by weight.

[Example 1] A 30φ, 254mm aluminum cylinder was used as a support, and a coating composed of the following materials was applied on the support by a dip coating method, and was thermally cured at 140 ° C for 30 minutes to 15µm. Was formed.

Conductive pigment: SnO ₂ coated barium sulfate 10 parts Resistance adjusting pigment: titanium oxide 2 parts Binder resin: phenol resin 6 parts Leveling material: silicone oil 0.001 parts Solvent: methanol, methoxypropanol 0.2 / 0.8 20 parts

Next, a solution prepared by dissolving 3 parts of N-methoxymethylated nylon and 3 parts of copolymerized nylon in a mixed solvent of 65 parts of methanol and 30 parts of n-butanol was applied thereon by dip coating to form a coating having a thickness of 0.5 μm. Was formed.

Next, oxytitanium phthalocyanine (TiOPc) having strong peaks at 9.0 °, 14.2 °, 23.9 ° and 27.1 ° in Bragg angles 2θ ± 0.2 ° of CuKα characteristic X-ray diffraction. ) 4 parts and 2 parts of polyvinyl butyral (trade name: Eslec BM2, manufactured by Sekisui Chemical) and 60 parts of cyclohexanone were dispersed for 4 hours by a sand mill using φ1 mm glass beads, and then 100 parts of ethyl acetate was added to form a charge generating layer. A dispersion was prepared.
This was applied by a dip coating method to form a 0.3 μm charge generation layer.

Next, the charge transport material 4 described in Condition 1 of Table 2 was used.
Was dissolved in a mixed solvent of 30 parts of monochlorobenzene and 50 parts of dichloromethane. This polymer has a predetermined biphenol (0.01 m
ol), sodium hydroxide (0.8 g) and tetramethylammonium chloride (1 g) were dissolved in 100 ml of water and charged into a 1-liter mixer, into which terephthalic acid chloride (1,2-dichloroethane (30 ml)) was added. 0.0
05mol) and isophthalic acid chloride (0.005mo)
l) was added while stirring, and the mixture was stirred at high speed for 10 minutes. After leaving for 2 hours, a 1,2-dichloroethane solution was recovered, and a large amount of hexane was added to the solution to recover the polymer. In addition, the thing which performed the purification process by water washing | cleaning, chloroform dissolution, and methanol dripping after collection | recovery was used.

This paint is applied by a dip coating method,
It was dried at 120 ° C. for 2 hours to form a 25 μm charge transport layer.

Next, the evaluation will be described.

The device is a Hewlett-Packard LBP
"Laser jet 4plus" (process speed 7
1 mm / sec). In the remodeling, the primary charging was controlled to be constant current, the constant voltage was controlled to be positive, and a positive toner was used. The prepared electrophotographic photoreceptor is converted to 28
Paper passing durability (HH durability) was performed at 90 ° C. and 90% RH. The sequence was an intermittent mode in which the print was stopped once for each print.

When the toner ran out, the toner was replenished and the image was durable until a problem occurred in the image. Further, abrasion was performed for 15 minutes using a Taber abrasion tester using a polishing tape, and the weight loss at that time was measured.

Further, 3000 L of a part of the electrophotographic photosensitive member is used.
ux, the light of a white fluorescent lamp was applied for 10 minutes, and after standing for 10 minutes, the bright portion potential was measured, and how much the bright portion potential decreased before the application of the light was measured to obtain a photo memory value.

Further, regarding the solvent cracking property, sebum was adhered to the surface and allowed to stand for 48 hours, and the presence or absence of solvent cracking was observed by microscopic observation.

Table 4 shows the results.

[0073]

[Table 3]

[0074]

[Table 4] The mixing ratio between terephthalic acid chloride and isophthalic acid chloride was 1: 1 in molar ratio. [Example 2-9] The charge transporting material of the charge transporting layer used was a material having the conditions 2 to 9 of Table 2 and the binder resin was Condition 2 of Table 3.
The electrophotographic photoreceptor was prepared and evaluated in the same manner as in Example 1 except that the electrophotographic photoreceptor was used. Table 4 shows the results.

[Examples 10-12] As the charge generating material, 5 parts of the phthalocyanine compound of Example 1 and the charge transporting material containing the hole transporting agent of the following formula (9):
2 described in Table 2 for a total of 80 parts of binder resin
Using 100 parts of polyarylate described in Conditions 10 to 12 above, these were added to a mixed solvent of 400 parts of chlorobenzene and 400 parts of dichloromethane, and mixed and dispersed with a paint shaker to prepare a single layer type coating solution. This solution was applied by dip coating on a cylinder coated to the conductive layer and the intermediate layer in the same manner as in Example 1, and then applied to the cylinder.
The resultant was dried at 60 ° C. for 60 minutes to form a single-layer photosensitive layer having a thickness of 25 μm, and the same evaluation as in Example 1 was performed.

[0076]

Embedded image

[0077]

[Table 5]

[Comparative Example 1-3] In Comparative Examples 1 and 2, the compound of the following formula (10) was used alone as a transport material for the charge transport layer.
In Comparative Example 3, the compound represented by the formula (8) was used alone.
An electrophotographic photoreceptor was prepared and evaluated in the same manner as in Example 1 except that the binders having the conditions 1 to 3 in Table 5 were used. Table 6 shows the results.

[0079]

Embedded image

Comparative Example 4 Example 10 was repeated except that 2 parts of the compound of the formula (8) and 2 parts of the compound of the formula (9) were used as the charge transporting material, and the binder having the condition 4 in Table 5 was used. An electrophotographic photoreceptor was prepared and evaluated in the same manner as described above. Table 6 shows the results.

[0081]

[Table 6]

[0082]

[Table 7]

[0083]

According to the present invention, it has excellent solvent crack resistance without impairing mechanical strength, furthermore has high mechanical strength, and has good electric resistance against discharge by direct charging. It has become possible to provide an electrophotographic photosensitive member suitable for direct charging, which is easy to perform, and a process cartridge and an electrophotographic apparatus having the electrophotographic photosensitive member.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a schematic configuration of an electrophotographic apparatus having a process cartridge having an electrophotographic photosensitive member of the present invention.

FIG. 2 is a diagram illustrating an example of a block diagram of a facsimile having the electrophotographic photosensitive member of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrophotographic photoreceptor of this invention 2 axis 3 Primary charging means 4 Image exposure light 5 Developing means 6 Transfer means 7 Transfer material 8 Image fixing means 9 Cleaning means 10 Pre-exposure light 11 Process cartridge 12 Rail 13 Image reading section 14 Controller 15 Receiving circuit 16 transmitting circuit 17 telephone 18 line 19 image memory 20 CPU 21 printer controller 22 printer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yama ▲ saki ▼ To 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Wataru Kitamura 3-30-2 Shimomaruko, Ota-ku, Tokyo No. Inside Canon Inc.

Claims (6)

[Claims] 1. An electrophotographic photoreceptor having a photosensitive layer on a conductive support, wherein the surface layer of the electrophotographic photoreceptor comprises a polymer having a structural unit represented by the following formula (1): An electrophotographic photoreceptor comprising a diphenoquinone-based compound represented by the formula (1): Embedded image (Wherein, X is -CR ₁₃ R ₁₄ - (R ₁₃ and R ₁₄ are each independently a hydrogen atom, a trifluoromethyl group, an alkyl group or an aryl group having 6 to 12 carbon atoms having 1 to 6 carbon atoms) ,
An optionally substituted 1,1-cycloalkylene group having 5 to 11 carbon atoms, an α, ω-alkylene group having 2 to 10 carbon atoms, a single bond, —O—, —S—, —SO— or —SO ₂ -. R _{1 to} R ₁₂ are each independently a hydrogen atom, a halogen atom, an optionally substituted alkyl group, an aryl group or an alkylene group, and n is an integer. ) (In the formula, R ₁₅ to R ₁₈ each independently represent a hydrogen atom, an alkyl group, an aralkyl group or an aryl group. In addition, R ₁₅
And R ₁₇ and R ₁₆ and R ₁₈ may be closed. However, R ₁₅
To R ₁₈ are not hydrogen atoms at the same time. ) 2. The electrophotographic photoconductor according to claim 1, wherein the polymer having the structural unit represented by the formula (1) is a polymer having the following structure (3). Embedded image 3. The electrophotographic photoreceptor according to claim 1, wherein the diphenoquinone compound has the following structure (4) or (5). Embedded image 4. The electrophotograph according to claim 1, wherein the polymer having the structural unit represented by the formula (1) is a copolymer of the structure (3) and the following structure (11). Photoconductor. Embedded image 5. The electrophotographic photoreceptor according to claim 1, wherein:
A process cartridge which integrally supports at least one unit selected from the group consisting of a charging unit, a developing unit, and a cleaning unit, and is detachable from an electrophotographic apparatus main body. 6. The electrophotographic photoreceptor according to claim 1, wherein:
An electrophotographic apparatus comprising a charging unit, an image exposing unit, a developing unit, and a transferring unit.