JP3100071B2 - Manufacturing method of electrophotographic photoreceptor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an electrophotographic photosensitive member, and more particularly to a method for producing an electrophotographic photosensitive member excellent in durability, potential stability, and surface slipperiness.

[0002]

BACKGROUND OF THE INVENTION An electrophotographic photosensitive member employs a repetitive process of charging, exposing, developing, transferring, cleaning, and removing electricity in an image forming process. The electrostatic latent image formed by charging and exposure is developed with toner, which is a fine powder. Further, the developed toner is transferred to a transfer material such as paper in a transfer process, but 100% of the toner is not transferred, and a part of the developed toner is left on the photoconductor. Unless the remaining toner is removed, a high-quality image free of stains or the like cannot be obtained in a repeated process. For that reason,
Cleaning of the remaining toner is required. As a cleaning process, a process using a fur brush, a magnetic brush, a blade, or the like is typical.
Generally, blade cleaning is selected in terms of rationalization of the device configuration. Here, the blade cleaning will be described in more detail with reference to FIGS. 1 (A) and 1 (B).
As shown in (1), an elastic member made of a material such as a plate-like polyurethane is pressed and brought into contact with the photoreceptor to scrape off the residual toner. In FIG. 1, reference numeral 11 denotes a blade holding member, and 12 denotes a cleaning blade. In order to increase the cleaning accuracy, it is necessary to appropriately increase the blade contact pressure on the photoconductor. As a method of contacting the blade 4 with the photoreceptor 3, a method in which the blade is configured perpendicular to the photoreceptor, a method in a forward direction with respect to the rotation direction shown in FIG. Although it is conceivable, the type in the opposite direction of FIG. 3 is preferable from the viewpoint of cleaning accuracy.

In such a configuration for improving the cleaning accuracy, the contact pressure between the photosensitive member and the blade is simultaneously increased to increase the frictional force generated therebetween. as a result,
Problems such as an increased amount of scraping of the photoreceptor, generation of flaws, and cleaning failure and stoppage of the apparatus caused by so-called “blade turning” in which the blade is inverted are caused. FIG. 4 shows a blade reversal state in which the apparatus has stopped. It is known that it is effective to lower the friction coefficient of the photoconductor in order to solve the above-mentioned problems related to cleaning.
Conventionally, a method of adding a lubricant to a surface layer of a photoconductor has been proposed as a means for reducing the friction coefficient of the photoconductor. Specifically, JP-A-52-117134 and JP-A-53-1078
41, 54-26740, 54-27434, 5
4-86340, 54-143142, 54-14
3148, 56-9345, 56-126838,
57-14845, 57-74748, 57-3
5863, 57-76553, 58-44444,
58-70229, 58-102949, 58-
163958, 59- 197042, 62-272
281, 63-30850, 63-56658, 63-58352, 63-58450, 63-61
255, 63-61256, 63-65449, 63-65450, 63-65451, 63-73
267, 63-221355, 63-24915
2, and 63-31356.

As a lubricant, a fluorine-containing resin such as polytetrafluoroethylene is preferable.

[0005] Lubricants include acrylic resin, polycarbonate polystyrene resin, epoxy resin, polyester resin,
After being dispersed in a binder resin such as a polyurethane resin, it is applied and formed on the surface of the photoreceptor. The disadvantage of the electrophotographic photoreceptor provided with the surface layer obtained by these methods is that when a large amount of lubricant is dispersed from the necessity of satisfying the required slipperiness on the photoreceptor surface, the sensitivity is reduced and the residual potential is reduced. In addition, if the amount of lubricant is reduced, the frictional resistance will increase and the blade will not be able to maintain the advantage of turning over or wear resistance due to the increase in friction resistance.
In addition, it is difficult to achieve the three elements of electrophotographic characteristics with excellent performance. Therefore, in the photoreceptor surface layer of the lubricant-added system, the amount of the lubricant sufficient to satisfy the slip property is provided in the vicinity of the surface, and the electrophotographic properties and abrasion resistance are provided in the support side. It is necessary to satisfy the minimum necessary amount of lubricant to satisfy the property, and the characteristics required in the thickness direction of the same surface layer are different.

It is therefore an object of the present invention, the surface sliding property, abrasion resistance, each of the electrophotographic characteristics are satisfied at a high level, Chi coercive high-quality images even after repeated use, the outermost layer containing a lubricant To provide a method for producing an electrophotographic photosensitive member having

[0007]

According to the present invention, in a method for producing an electrophotographic photoreceptor having at least a photosensitive layer on a conductive support, the outermost layer of the photoreceptor comprises a binder resin solution and a polytetrafluoroethylene resin. A method for producing an electrophotographic photoreceptor is provided, wherein at least two kinds of paints of a powder dispersion are independently sprayed and formed.

The present invention will be further described with reference to the drawings. (See FIG. 5) Reference numeral 1 denotes a support, which is usually 24 mm to 240 mm in diameter, fixed to a jig and capable of rotating at an arbitrary rotation speed. Reference numerals 2 and 3 denote paint atomizing devices, which can use not only general air spray but also airless spray and other atomizing systems. Further, the atomizing devices 2 and 3 are provided with a function of moving in a direction parallel to the center line of the support 1 at an arbitrary speed by an elevating device, and a function of adjusting the distance and angle with the support application surface. . The present invention is characterized in that the respective functions of the atomizing devices 2 and 3 are separated. That is, in the stage of forming the outermost layer (the layer which is the outermost surface of the photoreceptor) in the electrophotographic photoreceptor manufacturing process, paints having different functions are supplied to the atomizing device 2 and the atomizing device 3, and the paints are atomized to form a coating film. It is intended to obtain a coating film having a performance that cannot be obtained by a normal single coating material by forming a coating material having a plurality of functions and mixing or separating fine layers.

More specifically, a case where a binder resin solution is supplied to the atomizing device 2 and a polytetrafluoroethylene powder dispersion is supplied to the atomizing device 3 will be described as an example. As the binder resin of the binder resin solution, a polycarbonate resin, an acrylic resin, a polyester resin, a polyurethane resin, or the like is dissolved in a common organic solvent, and depending on the case, a slight amount of a lubricant and a photosensitive material may be added, a sensitizer or an antioxidant. It is also possible to add additives such as.

The dispersion is composed of a lubricant and a solvent. However, from the viewpoint of dispersion stability and performance, the addition of a binder resin and a dispersion aid,
It is possible to add a surfactant and the like, a photosensitive material, and an additive such as a sensitizer and an antioxidant. At least these two paints are atomized to form a coating. In the present invention, various coating characteristics can be obtained by the arrangement method of the atomizing devices 2 and 3. By rotating the support according to FIG. 5 and moving the atomizer from above to below to apply, the outermost surface of the outermost layer is covered with a binder resin (FIG. 8A), and conversely, it moves upward from below. If it is applied by coating, the vicinity of the surface becomes polytetrafluoroethylene- rich (FIG. 8B). The degree of mixing or the degree of separation of at least two kinds of paints in these coating films is determined by atomizing devices 2 and 3
Can be arbitrarily adjusted according to the arrangement of the atomizers, that is, the distance and angle between the atomizing devices 2 and 3. In FIG. 6, the atomization of the paint is kept in a completely mixed state (FIG. 8 (c)), and in FIG. 7, the atomized paint is coated in a completely separated state. Thus, a fine lamination structure (FIG. 8D) is obtained depending on the number of rotations of the support. Further, although one set is shown in each figure, it is effective means to use a plurality of atomizing systems including the atomizing devices 2 or 3 according to the required film quality and film thickness. FIG.
(E) shows a preferred state of the outermost layer when a protective layer having a thickness of 3.0 μm is provided as the outermost layer in the present invention. This preferable outermost layer configuration state is 0.5 μm from the surface of the photosensitive member closest to the surface in order to reduce excessive frictional force generated between the cleaning member and the photosensitive member when the photosensitive member is mounted on an actual copying machine. Lubricant content in the thickness direction of 30-50
In order to satisfy electrophotographic characteristics such as sensitivity and residual potential, a layer with a minimum necessary lubricant content of 5 to 10% by weight for abrasion resistance is provided in the lower layer. It was formed in a typical manner. The atomizing system uses the form of FIG. 5 and the binder resin solution is supplied to the atomizing device 2 and the lubricant dispersion is supplied to the atomizing device 3 so that the pattern area of the paint atomized by the atomizing devices 2 and 3 is 90%. It is fixed in an overlapping arrangement, and the support is rotated at 200 rpm from above in the figure to apply and coat. For reference, the binder resin solution has a binder / photosensitive material / solvent ratio of 2/1/10 by weight.
0, the lubricant dispersion has a weight ratio of lubricant / binder / photosensitive material / surfactant / solvent of 3/3/1 / 0.1 /
150. Note that this is only an example, and a specific example of the surface layer is not limited to FIG.

Next, the layer constitution of the electrophotographic photosensitive member according to the present invention will be described. Metals and alloys such as iron, copper, gold, silver, aluminum, zinc, lead, tin, titanium, and nickel, or oxides of these metals, carbon, and conductive polymer moldings are used as the conductive support. It is possible. In addition, conductive paint on non-conductive materials such as paper, plastic, and ceramic,
In some cases, conductive treatment such as vapor deposition is performed before use. The shape includes a drum shape such as a cylindrical shape and a column shape, a sheet shape, and a belt shape. A conductive layer may be further provided between the support and the photosensitive layer, or an intermediate layer may be provided for the purpose of improving the adhesion between the photosensitive layer and the support or the conductive layer and improving the electrical characteristics. The intermediate layer is made of casein, polyvinyl alcohol, nitrocellulose, polyvinyl butyral, polyester,
Polyurethane, gelatin, polyamide (nylon 6, nylon 66, nylon 610, copolymer nylon, alkoxymethylated nylon) can be formed of aluminum oxide or the like. The thickness of the intermediate layer is suitably from 0.1 to 10 μm, preferably from 0.3 to 3.0 μm.

The present invention provides a laminated photoreceptor in which a charge generating layer containing a charge generating substance and a charge transporting layer containing a charge transporting substance are laminated, or a single-layer photosensitive body in which a charge generating substance and a charge transporting substance are contained in a single layer. And a photoreceptor having a protective layer as the outermost layer among these laminated and single-layer photoreceptors.
Examples of the charge generating substance include a phthalocyanine pigment, a polycyclic quinone pigment, a trisazo pigment, a disazo pigment, an azo pigment, a perylene pigment, an indigo pigment, a quinacridone pigment, an azurenium salt dye, a squalium dye, a cyanine dye, a pyrylium dye, a thiopyrylium dye, and a xanthene dye. , Triphenylmethane dye, styryl dye, selenium, selenium-tellurium alloy, amorphous silicon, cadmium sulfide and the like. Pigments and dye-based charge-generating substances are generally dispersed in a binder resin and used as a coating material.Examples of such a binder resin include polyvinyl butyral, polyvinyl benzal, polyarylate, polycarbonate, polyester, and polyurethane. ,
Phenoxy resins, acrylic resins, cellulose resins and the like are preferred.

Examples of charge transport materials include pyrene compounds, N-alkylcarbazole compounds, hydrazone compounds, N, N dialkylaniline compounds, diphenylamine compounds, triphenylamine compounds, triphenylmethane compounds, pyrazoline compounds, styryl compounds, stilbene compounds. Compounds, polynitro compounds, polycyano compounds and the like. These charge transporting substances are generally used as a coating by dissolving in a binder resin, but polycarbonate, polyester, polyurethane,
Polysulfone, polyamide, polyarylate, polyacrylamide, polyvinyl butyral, phenoxy resin,
An acrylic resin, an acrylonitrile resin, a methacrylic resin, a phenol resin, an epoxy resin, an alkyd resin and the like can be mentioned. These charge generation materials and charge transport materials may be in the form of a laminated photoreceptor as the charge generation layer and the charge transport layer, or may be mixed to form a single-layer photoreceptor, and the present invention can be applied to the most surface layer. . The present invention is also applicable to a case where a protective layer or the like is provided as the outermost layer of a laminated or single-layer photoreceptor.

FIG. 9 shows a schematic configuration example of a general transfer type electrophotographic apparatus using the electrophotographic photosensitive member manufactured according to the present invention.

In FIG. 1, reference numeral 101 denotes a drum-type photosensitive member of the present invention as an image carrier, which is driven to rotate at a predetermined peripheral speed in the direction of an arrow around a shaft 101a. During the rotation of the photosensitive member 101, the peripheral surface thereof is uniformly charged with a predetermined positive or negative potential by a charging unit 102, and then the exposure unit 103
Receives light image exposure L (slit exposure, laser beam scanning exposure, etc.) by an image exposure means (not shown). As a result, an electrostatic latent image corresponding to the exposure image is sequentially formed on the peripheral surface of the photoconductor.

The electrostatic latent image is then developed with toner by developing means 104, and the developed toner image is transferred by a transfer means 105 from a paper feed unit (not shown) to the photosensitive body 101 and the rotation of the photosensitive body 101. The transfer material P is sequentially transferred onto the surface of the transfer material P which is synchronously taken out and fed.

The transfer material P having undergone the image transfer is separated from the photoreceptor surface, introduced into the image fixing means 108, subjected to image fixing, and printed out of the machine as a copy.

After the image is transferred, the surface of the photoreceptor 101 is cleaned by a cleaning unit 106 to remove the untransferred toner, and further subjected to a static elimination process by a pre-exposure unit 107 to be used repeatedly for image formation.

As the uniform charging means 102 for the photosensitive member 101, a corona charging device is generally widely used. Also, the corona transfer unit is generally widely used for the transfer device 105. As the electrophotographic apparatus, the above-described photoconductor and developing means,
Of the components such as the cleaning means, a plurality of components may be integrally connected as a device unit, and this unit may be configured to be detachable from the device main body. For example, the photoconductor 101 and the cleaning unit 106 may be integrated into one apparatus unit, and may be configured to be detachable using a guide unit such as a rail of the apparatus body. At this time, the above-described device unit may be provided with a charging unit and / or a developing unit.

When the electrophotographic apparatus is used as a copier or a printer, the light image exposure L is a signal reflected from or transmitted from the original, or a read signal from the original, and is scanned by a laser beam, an LED array or the like. , Or by driving a liquid crystal shutter array.

When used as a facsimile printer, the light image exposure L is an exposure for printing received data. FIG. 10 is a block diagram showing an example of this case.

The controller 111 controls the image reading unit 110 and the printer 119. The entire controller 111 is controlled by the CPU 117. Image reading unit 1
The read data from 10 is transmitted to the partner station through the transmission circuit 113. The data received from the partner station is
12 and sent to the printer 119. The image memory 116 stores predetermined image data. The printer controller 118 controls the printer 119.
114 is a telephone.

The image information received from the line 115 (image information from a remote terminal connected via the line)
After being demodulated by the receiving circuit 112, the CPU 117 performs a decoding process and sequentially stores the decoded data in the image memory 116. When the image information of at least one page is stored in the memory 116, the image of the page is recorded. CPU1
17 reads out one page of image information from the memory 116 and sends out the decoded one page of image information to the printer controller 118. Printer controller 118
Receives the image information of one page from the CPU 117, and controls the printer 119 to record the image information of the page.

The CPU 117 receives the next page during recording by the printer 119.

As described above, image reception and recording are performed.

The electrophotographic photoreceptor manufactured according to the present invention is not only used for electrophotographic copying machines but also widely used in electrophotographic applications such as laser beam printers, CRT printers, LED printers, liquid crystal printers, and laser plate making. Can be.

[0027]

Next, the present invention will be described in more detail with reference to examples. Example 1 After mixing and dissolving 10 parts by weight of polyamide (CM-8000: manufactured by Toray), 100 parts by weight of methanol and 80 parts by weight of butanol, the outer diameter is 80 mm, the wall thickness is 1.5 mm, and the length is 363.
It was applied by dipping on an aluminum cylinder having a thickness of 1.0 mm, and after drying, an intermediate layer having a thickness of 1.0 μm was provided.

Next, 10 parts by weight of the following trisazo pigment:

[0029]

Embedded image 5 parts by weight of a polyvinyl butyral resin (ESREC BX-S: manufactured by Sekisui Chemical) and 600 parts by weight of cyclohexanone were dispersed by a sand mill using glass beads to obtain a charge generating layer coating. This paint was applied on the above-mentioned intermediate layer by a usual spray coating method, and after drying, a charge generation layer having an adhesion amount of 150 mg / m ² was obtained.

Next, 10 parts by weight of a stilbene compound represented by the following structural formula:

[0031]

Embedded image Polycarbonate resin (bisphenol Z type, trade name:
10 parts by weight of Iupilon Z200, manufactured by Mitsubishi Gas Chemical Co., Ltd.) are dissolved in 50 parts by weight of monochlorobenzene and 20 parts by weight of dichloromethane to prepare a charge transport layer paint, which is applied by dipping on the charge generation layer and dried to form a 20 μm-thick charge. A transport layer was provided.

Next, a protective layer was provided by the method described below. 50 parts by weight of the above-mentioned stilbene compound and 75 parts by weight of the above-mentioned polycarbonate resin were dissolved in 1800 parts by weight of monochlorobenzene to prepare a binder resin paint, which was supplied to the atomizing apparatus 2 of the apparatus shown in FIG. Furthermore, polytetrafluoride ii ethylene particles (Lubron L-5: Daikin Industries Ltd.) 20 parts by weight was added to a solution consisting of a polycarbonate resin (Iupilon Z200) 40 parts by weight of monochlorobenzene 1000 parts by weight of the above surfactant ( GF-300: manufactured by Toagosei Co., Ltd.) was dispersed in a ball mill apparatus with 1 part by weight, the resulting polytetrafluoroethene
The Tylene powder dispersion was supplied to the atomizer 3.

The support provided up to the charge transport layer was mounted on the apparatus shown in FIG. 5 and rotated at 200 rpm, and the atomizers 2 and 3 were simultaneously moved above the lower end of the support to form a coating film. . In addition, the paint atomization pattern areas of the atomizers 2 and 3 were arranged so as to overlap by 90%. The thickness of the obtained protective layer was 3 μm. The photoreceptor thus obtained was named working photoreceptor 1.

COMPARATIVE EXAMPLE 1 A photoreceptor having no protective layer in Example 1 was used as Comparative Photoreceptor 1.

Comparative Example 2 A photosensitive member similar to that of Example 1 was prepared up to the charge transport layer.

Next, similar stilbene compound 50 parts by weight as in Example 1, also the polycarbonate resin 75 parts by weight of the above binder resin coating material is dissolved in monochlorobenzene 1800 parts by weight, further, polytetrafluoride Russia ethyl <br / > 20 parts by weight of the Len particles (Rublon L-5: manufactured by Daikin Industries, Ltd.) are mixed with the above polycarbonate resin (Iupilon Z20).
0) Polytetrafluoroethylene powder obtained by adding to a solution consisting of 40 parts by weight and 1000 parts by weight of monochlorobenzene, and dispersing with a ball mill with 1 part by weight of a surfactant (GF-300: manufactured by Toa Gosei Chemical Co., Ltd.) The dispersion was mixed with the binder resin paint. This coating material was applied uniformly on the charge transport layer prepared by the apparatus shown in FIG. 5 in the same manner as in Example 1, and after drying, a protective layer having a thickness of 3 μm was provided. The photoreceptor thus obtained was designated as comparative photoreceptor 2.

[Evaluation Result 1] The evaluation was made using a Canon digital color copier (CLC-
This was performed using 1). The evaluation results are shown in the table below,
With respect to the contents of evaluation, there is following topics: Ride. "Blade turn-up" is performed when the photosensitive drum is mounted on a copying machine having a new cleaning blade (the cleaning blade is set in the counter direction (reverse direction) shown in FIG. 3) and the copying operation is started. This indicates that the cleaning blade is inverted and copying cannot be continued. "Durability" indicates the amount of abrasion of the photoreceptor after 20,000 continuous color copies after the drum was artificially mounted by applying a toner or the like so as to avoid blade turning. "Durable image" also shows the image quality after 20,000 continuous color copies.

Implementation Comparison Comparative Photoreceptor 1 Photoreceptor 1 Photoreceptor 2 <Blade Flipping> Blade Flipping Without Blade Flipping Blade Flipping Drum Scratched Drum Scratched <Durability> −2.0 μm − 12μm-5μm <Durable image> Good image is maintained. A fog is generated due to scratches due to rubbing due to a decrease in the dark area potential. Example 2 The same thing as in Example 1 was prepared up to the charge generation layer.

Next, 70 parts by weight of the same stilbene compound as in Example 1 and 75 parts by weight of the above-mentioned polycarbonate resin were dissolved in 1500 parts by weight of monochlorobenzene to obtain a binder resin paint. 2. Furthermore, it polytetrafluoride ii ethylene particles (Lubron L-5: Daikin Industries Ltd.) 20 parts by weight of the aforementioned polycarbonate resin (Iupilon Z200) 40 parts by weight, consisting of stilbene compounds 20 parts by weight of monochlorobenzene 1000 parts by weight of the above In a solution, the mixture was dispersed in a ball mill with 1 part by weight of a surfactant (GF-300: manufactured by Toa Gosei Chemical), and the resulting polytetrafat was obtained.
The fluoroethylene powder dispersion was supplied to the atomizer 3.

The support provided up to the charge generation layer was mounted on the apparatus shown in FIG. 5 and rotated at 200 rpm, and the atomizers 2 and 3 were simultaneously moved above the lower end of the support to form a coating film. . Note that the paint atomization pattern areas of the atomizing devices 2 and 3 are arranged so as to overlap by 90%, the film thickness after drying of the coating film obtained by the atomizing device 2 is 15 μm, and the film thickness obtained by 3 is 5 μm. The discharge amount was adjusted so that The thickness of the surface layer thus obtained after drying was 20 μm. This was designated as Photoconductor 2.

Comparative Example 3 A photosensitive member similar to that of Example 2 was prepared except that the outermost layer having a thickness of 20 μm was formed after drying with only the atomizing device 2 without operating the atomizing device 3. It was body 3.

COMPARATIVE EXAMPLE 4 A completely similar photosensitive member was prepared in the same manner as in Example 2 except that the coating direction was reversed, that is, below the upper end of the support.

[Evaluation Result 2] The evaluation method was the same as that used for the evaluation result 1, and is summarized in the following table. Implementation Comparison Comparative Photoconductor 2 Photoconductor 3 Photoconductor 4 <Blade Turnover> Blade Turnover Blade Turnover Blade Turnup Drum Scratched Drum Scratched <Durability> -3.0 μm −12 μm −6 μm <Durable image> Maintains good image. Similar fogging and rubbing are also observed due to a decrease in dark area potential. Example 3 The same thing as in Example 1 was prepared up to the intermediate layer. Next, 10 parts by weight of the stilbene compound shown in Example 1 and a styrene-methyl methacrylate copolymer resin (trade name MS20)
0: Nippon Steel Chemical Co., Ltd.) 10 parts by weight was dissolved in 70 parts by weight of toluene to prepare a charge transport layer paint. This paint was applied onto the intermediate layer by dipping and dried to form a charge transport layer having a thickness of 15 μm.

Next, disazo pigment 1 represented by the following structural formula:
0 parts by weight

[0045]

Embedded image Was dispersed in a sand mill using glass beads together with 10 parts of polyvinyl butyral resin (Eslec BLS: manufactured by Sekisui Chemical) and 1000 parts of cyclohexanone to prepare a charge generating layer coating material. This paint was applied on the charge transport layer by a usual air spray device, and after drying, a charge generation layer having a thickness of 0.5 μm was provided.

Next, a protective layer was provided on the charge generation layer in exactly the same manner as the method for forming the protective layer shown in Example 1, and this electrophotographic photoreceptor was used as a practical photoreceptor 3.

Comparative Example 5 Example 3 was repeated except that no protective layer was provided.
A photoreceptor exactly the same as that described above was prepared and used as comparative photoreceptor 5.

Comparative Example 6 A charge generating layer was prepared in the same manner as in Example 3.

Next, when the protective layer is provided in Example 1, the binder resin solution supplied to the atomizer 2 and the polytetrafluoroethylene powder supplied to the atomizer 3 shown in FIG. The dispersions were uniformly mixed at a ratio of 2: 1, 1: 1 and 1: 2, respectively, to obtain paints. The paint was supplied to an atomizer and dried to form a protective layer having a thickness of 3 μm on the charge generating layer. At this time, a photoreceptor having a protective layer obtained from a binder resin solution and a polytetrafluoroethylene powder dispersion in a ratio of 2: 1 was used as a comparative photoreceptor 6, and also a photoreceptor obtained in a 1: 1 ratio. Was designated as Comparative Photoreceptor 7, and the photosensitive member obtained from 1: 2 was designated as Comparative Photoreceptor 8.

[Evaluation Result 3] The actual photoconductor 3 and the comparative photoconductors 5, 6, 7, and 8 were replaced with a plain paper copying machine NP-3 manufactured by Canon.
It was mounted on an 825 modified machine (primary charging was set as positive charging) and evaluated in the same manner as the method for obtaining the evaluation result 1. However, the number of durable sheets was 100,000.

The evaluation results are shown below.

Practical comparison Comparative photoreceptor 3 Photoreceptor 5 Photoreceptor 6 <Blade turnover> Blade turnover Blade turnover Blade turnup Drum scratched Drum scratched <Endurance> -3.0 μm start From the start 100 to 20,000 sheets Charge generation layer Charge generation layer Abrasion loss Abrasion loss <Endurance image> Maintain good image − − Comparison Comparative photoconductor 7 Photoconductor 8 <Blade turn-up> Blade turns Flipped drum Scratched drum Scratched <Durability> From start 40,000 sheets from start 70,000 sheets Charge generation layer Charge generation layer Abrasion disappearance Abrasion disappearance <Lifetime image> − −

[0053]

As described above, according to the present invention, according to the present invention, the electrophotographic characteristics required for the photoreceptor are satisfied, and the surface slip and abrasion resistance, which have been hardly obtained in the past, are remarkably improved. It has become possible to provide an electrophotographic photoreceptor having high durability and high quality image characteristics even after the durability.

[Brief description of the drawings]

FIG. 1 is a schematic view of a blade.

FIG. 2 is a diagram illustrating a method (forward direction) of contact of a blade with a photoconductor.

FIG. 3 is a diagram illustrating a method of contacting a blade with a photoconductor (in a reverse direction).

FIG. 4 is a diagram showing a reversal state of a blade.

FIG. 5 is a diagram showing a spray state of paint.

FIG. 6 is a diagram showing a state of spraying paint (for forming a complete mixed layer).

FIG. 7 is a diagram showing a state of spraying a paint (for forming a complete separation layer).

FIG. 8 is a configuration diagram of the outermost layer of the photoconductor.

FIG. 9 is a schematic configuration diagram of a general transfer type electrophotographic apparatus.

FIG. 10 is a block diagram of a facsimile using the electrophotographic apparatus as a printer.

[Explanation of symbols]

 Reference Signs List 1 support 2 atomizer (for binder resin solution) 2 'paint tank 3 atomizer (for lubricant dispersion) 3' paint tank 4 atomizer moving shaft 5 support holding and rotating device

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masaaki Yamagami 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Harumi Haruka 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inside (72) Inventor Noboru Kashimura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (56) References JP-A-63-65449 (JP, A) JP-A-2-205856 (JP) , A)

Claims (7)

(57) [Claims] 1. A method for producing an electrophotographic photoreceptor having at least a photosensitive layer on a conductive support, wherein the outermost layer of the photoreceptor comprises a binder resin solution and a polytetrafluoroethylene.
A method for producing an electrophotographic photoreceptor, characterized in that at least two kinds of paints of a lentin resin powder dispersion are sprayed independently of each other. Wherein said process of claim 1 electrophotographic photosensitive member according to the outermost layer of the photoreceptor is characterized in that the charge transport layer. Wherein the process of claim 1 electrophotographic photosensitive member according to the outermost layer of the photoreceptor is characterized in that the charge generation layer. Wherein said photosensitive member manufacturing method of the electrophotographic photosensitive member according to claim 1, wherein the outermost layer is characterized by a protective layer of. 5. The method for manufacturing an electrophotographic photoreceptor according to claim 4, wherein the charging characteristic of the photoreceptor is negative charge. 6. The method for manufacturing an electrophotographic photoreceptor according to claim 4, wherein the charging characteristic of the photoreceptor is positive charge. 7. Binder resin solution and polytetrafur
The method for producing an electrophotographic photosensitive member according to claim 1, wherein the performing spray Oroechiren resin powder dispersion liquid by spray coating method.