JP2009150958A - Method of manufacturing support for electrophotographic photoreceptor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support excellent in contour accuracy for use in an electrophotographic photoreceptor and a method of manufacturing the support, and to provide an electrophotographic photoreceptor using the support for an electrophotographic photoreceptor, and an image forming apparatus mounted with the electrophotographic photoreceptor. <P>SOLUTION: The method of manufacturing the support for an electrophotographic photoreceptor is provided, the support being cylindrical with an outer diameter of not less than 70 mm produced by cutting an aluminum alloy raw tube formed through at least an extrusion processing, the method is characterized by heat-treating the aluminum alloy raw tube at 200°C to 550°C prior to the cutting processing. The present invention also provides the support for an electrophotographic photoreceptor manufactured by the above method, and an electrophotographic photoreceptor having a photosensitive layer formed on the support. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing a support for an electrophotographic photoreceptor, an electrophotographic photoreceptor support produced using the production method, and an electrophotographic photoreceptor using the electrophotographic photoreceptor support.

Conventionally, an electrophotographic photosensitive member used in an image forming apparatus such as an electrophotographic copying machine, a laser beam printer, a facsimile, or a printing machine has a photosensitive layer formed on a cylindrical support made of an aluminum alloy. It is manufactured by.
Since an image is formed as a latent image on the surface of the electrophotographic photosensitive member and then developed by developing the latent image with toner ink or the like, the area and shape of the surface of the electrophotographic photosensitive member are closely related to the image forming efficiency. There is a serious relationship.

Due to the recent demand for miniaturization of image forming apparatuses, sheet-like electrophotographic photosensitive members and cylindrical electrophotographic photosensitive members having a small diameter of 50 mm or less have been used. (E.g., see Patent Document 1), a request to increase the life of the electrophotographic photosensitive member, and a paper for forming an image in order to shorten the axial length of the electrophotographic photosensitive member. Since there is a demand to form a high-quality image at high speed even when it is sent in the direction, a relatively large-diameter cylindrical electrophotographic photosensitive member is still used, for example, an outer diameter exceeding 70 mm. A relatively large diameter cylindrical electrophotographic photosensitive member is also used.
JP 2004-29822 A

  In order to form a high-quality image, a cylindrical electrophotographic photosensitive member needs to have a more accurate outer shape, but is used to manufacture a cylindrical electrophotographic photosensitive member having a large diameter of 70 mm or more. In a support for an electrophotographic photosensitive member, it is difficult to obtain a highly accurate cylindrical shape due to the influence of residual stress due to the force applied during the processing. For example, the cylindricity and roundness specified in JIS B 0021 are difficult. Therefore, when an image is formed using an electrophotographic photosensitive member using such a support, defects such as density unevenness and dot misalignment of the image are likely to occur. Image defects such as color misregistration were likely to occur.

  An object of the present invention is to provide a support for an electrophotographic photosensitive member having excellent shape accuracy represented by roundness and cylindricity in a cylindrical support for an electrophotographic photosensitive member having an outer diameter of 70 mm or more, and a method for producing the same. Another object of the present invention is to provide an electrophotographic photosensitive member using the electrophotographic photosensitive member support and an image forming apparatus equipped with the electrophotographic photosensitive member.

The present inventor has intensively studied to solve such problems, and in the process of manufacturing a support for an electrophotographic photosensitive member, by performing a specific heat treatment before cutting, The inventors have found that it is possible to produce a support for an electrophotographic photoreceptor excellent in external accuracy, and reached the present invention.
That is, the first gist of the present invention is to produce a cylindrical support for an electrophotographic photosensitive member having an outer diameter of 70 mm or more, which is produced by cutting an aluminum alloy raw tube formed through at least an extrusion process. In the method, the aluminum alloy blank is subjected to a heat treatment at 190 ° C. to 550 ° C. before cutting, and the method for producing a support for an electrophotographic photosensitive member (Claim 1).

  The second gist of the present invention is the electrophotographic photosensitive member according to claim 1, wherein the aluminum alloy tube contains 0.5 wt% or more and 2.0 wt% or less of manganese. An electrophotographic photosensitive member characterized in that it is a method for producing a support for a body (claim 2), and the third gist of the present invention is that the duration of the heat treatment is 2 hours or more and 6 hours or less. A fourth aspect of the present invention is a support for an electrophotographic photosensitive member, characterized in that the aluminum alloy blank is formed by drawing. According to a fifth aspect of the present invention, a fifth aspect of the present invention includes a cross-sectional area of a plane perpendicular to the virtual axis of the aluminum alloy tube, and a plane perpendicular to the virtual axis of the rod before drawing. The difference in cross-sectional area due to the Characterized in that it is 20% or more with respect to the product, in the production method of an electrophotographic photoreceptor support (claim 5).

  The sixth aspect of the present invention resides in the support for an electrophotographic photosensitive member produced by the production method of the present invention (claim 6), and the seventh aspect of the present invention is the electrophotographic photosensitive member of the present invention. An electrophotographic photosensitive member having a photosensitive layer formed on a body support (claim 7), and an eighth aspect of the present invention resides in an image forming apparatus equipped with the electrophotographic photosensitive member of the present invention (claim). Item 8).

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the support body for large diameter electrophotographic photoreceptors which was excellent in the external precision, and to provide the electrophotographic photoreceptor which has the high quality external precision using the said support body. Is possible.

Hereinafter, embodiments of the present invention will be described in detail. However, the description of the constituent elements described below is a representative example of the embodiments of the present invention, and is appropriately modified and implemented without departing from the spirit of the present invention. can do.
The support for an electrophotographic photosensitive member according to the present invention is manufactured by cutting an aluminum alloy element tube formed through at least an extrusion process, and has an outer diameter of 70 mm or more. The aluminum alloy tube is heat-treated at 190 ° C. to 550 ° C. before cutting. In addition, the electrophotographic photoreceptor of the present invention is formed on the support for an electrophotographic photoreceptor produced by the above production method, or after an anodized film or an undercoat layer is formed on the support for an electrophotographic photoreceptor, A photosensitive layer is provided. The image forming apparatus of the present invention uses the electrophotographic photosensitive member.

<Material>
The support used in the present invention uses an aluminum alloy as a material, but any material can be used as long as it is an aluminum alloy that can be normally used as a support for an electrophotographic photosensitive member. . As the aluminum alloy, for example, a so-called pure aluminum-based material of the number 1000 system defined by JIS H 4080 (1988) can also be used. Among these, manganese is 0.5% by weight or more and 2.0% because it has the advantage that it is difficult to generate defects such as scratches, tears, cracks, etc., even if it is drawn or ironed, and has high strength. It is preferable to contain it by weight% or less. In order to increase the mechanical strength, more preferably, manganese containing 0.75% by weight or more, particularly 1.0% by weight or more is preferably used, so that workability and corrosion resistance are not deteriorated. Those containing 75% by weight or less, particularly 1.5% by weight or less are preferably used.

<Union tube>
The aluminum alloy tube used in the present invention is formed through extrusion, and any conventionally known method can be applied to this extrusion, for example, indirect extrusion, direct Examples thereof include an extrusion method. Specific examples of the direct extrusion method include a method of extruding an aluminum alloy from a port hole die while hot. The raw tube is processed into a cylindrical shape after the extrusion process, and then becomes a support for an electrophotographic photosensitive member through a cutting process. In order to obtain a cylinder having an outer diameter, it is preferable to perform processing such as drawing, cutting, and edge processing. Each of these steps can be performed according to conventional techniques.

  Drawing is performed by installing a die called a die on the inner diameter side and a die called a die on the outer diameter side, and extending the inner diameter and the outer diameter at the same time. Cause. In addition, the cutting process is performed in order to align the raw tube to a predetermined length. It is particularly preferable to perform the drawing process before the cutting process, because only the extrusion process and the cutting process may not provide a thin and highly accurate raw tube. Since drawing is usually performed at room temperature, it can be processed with higher accuracy than extrusion, and mechanical strength can be increased by work hardening.

  The degree of processing when drawing a tube formed through extrusion is the processing rate as the percentage when the difference between the cross-sectional area of the extruded tube and the cross-sectional area of the drawn tube is divided by the cross-sectional area of the extruded tube. . Although there is no restriction | limiting in particular in the processing rate in this invention, 45% or less is preferable at the point of the efficiency on a process, More preferably, it is 40% or less, Especially 35% or less is preferable. When the support for an electrophotographic photosensitive member has a relatively large diameter exceeding 70 mm in outer diameter, it is preferable that the support for the electrophotographic photosensitive member has higher strength than a support having a small diameter and is not easily deformed. In order to increase the outer diameter accuracy of the drawn tube, increase the strength of the drawn tube, or reduce the tensile elongation of the drawn tube, the processing rate is preferably 20% or more, more preferably 22% or more. It is preferable that it is 25% or more.

<Heat treatment>
In the production method of the present invention, the aluminum alloy tube is heat-treated at a temperature of 190 ° C. or higher and 550 ° C. or lower before cutting. The reason for the effect of the heat treatment is not clear, but the residual stress that has been applied to the base tube until the end of the cutting process is partially released during the cutting process. This is considered to prevent the influence of the deterioration of the external accuracy. The higher the temperature of the heat treatment, the better the efficiency. Therefore, the heat treatment is preferably performed at 210 ° C. or higher, more preferably 230 ° C. or higher. If the temperature is too high, the aluminum alloy may be softened and may be affected by gravity or applied heat. Since energy cost rises and production efficiency falls, it processes preferably at 500 degrees C or less, More preferably at 400 degrees C or less.
The time for the heat treatment is not particularly limited, but considering production efficiency, it is preferably 2 hours or longer and 6 hours or shorter, and particularly preferably 3 hours or longer and 5 hours or shorter.

<Shape of support>
When an electrophotographic photosensitive member is incorporated in an image forming apparatus, a developing mechanism that needs to be incorporated for image formation can be simplified, and the positioning accuracy of the developing mechanism is increased. May be required. Since the support for an electrophotographic photosensitive member used in such an electrophotographic photosensitive member has a larger diameter cylindrical shape, it is easily deformed, and the effect of the present invention for preventing it appears remarkably, The production method of the present invention is usually applied to the production of a cylindrical electrophotographic photoreceptor support having an outer diameter of 70 mm or more, preferably an outer diameter of 80 mm or more, more preferably an outer diameter of 100 mm or more, and particularly preferably an outer diameter of 110 mm or more. It is preferable to do.

  End processing refers to processing (inlay processing) for forming a step portion (inlay portion) to which a flange is to be attached by cutting the inside of the support, or chamfering of the end portion. In the inlay process, the thickness and depth to be reduced are determined according to the outer diameter and height of the flange to be mounted, and the inlay portion is formed. As a machine for this purpose, a both-ends processing machine is used, and a method is adopted in which the outer side or the inner side of the support is gripped by a collet chuck and the support or the cutter is rotated for processing. Further, the chamfering process of the end part is a process of processing the end part of the support for the electrophotographic photosensitive member in order to improve workability or facilitate the attachment of the flange.

  The outer surface of the electrophotographic photoreceptor support is cut using a fluid lathe or a solid bearing and a precision lathe that prevents vibration as much as possible. Furthermore, vibration can be prevented by installing a damping material or the like inside the support. This is because the surface state of the cylindrical electrophotographic photosensitive member formed by cutting directly affects the shape characteristics of the electrophotographic photosensitive member. Cutting is usually performed in two stages, rough cutting and finish cutting. Since the state of the cutting surface is determined by finishing cutting, precise cutting is required. A natural diamond single crystal or a sintered tool bit is used, usually with a cut of 20 to 30 μm. For rough cutting, there is no particular limitation as much as finishing cutting, and it is sufficient to create a state where the above-mentioned finishing cutting is possible, but in order to obtain a more accurate support by reducing the fluctuation of the cutting amount in finishing cutting, Higher maximum runout and roundness are preferred.

  Moreover, in addition to each said process, rough cutting can also be given to the outer surface of the support body before the said inlay process. If the cross-sectional shape of the extruded tube used for drawing is uneven or if the balance between the outer and inner surfaces of the drawing process is poor, the force applied to the drawing process does not contribute to the deformation. Rather, it is accumulated in the support as a partial residual stress. When such a support is subjected to a spigot process, the residual stress is released by the spigot process, and the dimensional accuracy of the spigot process part is deteriorated. Therefore, residual stress can be removed by performing preliminary processing before inlay processing.

  The support for an electrophotographic photosensitive member directly affects the outer shape of the electrophotographic photosensitive member, and the outer shape of the electrophotographic photosensitive member directly affects the quality of an image to be formed. In order to comprehensively determine the shape accuracy of a cylindrical body, cylindricity is usually used. The cylindricity in the present invention is determined as follows. The support for an electrophotographic photosensitive member is placed on a horizontal plane with the axial direction up and down, and three horizontal cross sections are determined at equal intervals between the horizontal cross sections at positions 25 mm from both ends. The least square center is obtained, and a straight line connecting the centers is set as a virtual axis. The distance from the virtual axis center to the support surface position in each horizontal section is measured at 40 points at equal intervals starting from an arbitrary point, and the maximum value is selected from among the five horizontal sections (total of 200 points). Find the minimum value and use the difference as the cylindricity. Therefore, the smaller the cylindricity value is, the better the support accuracy is. Usually, for measuring the cylindricity, a measuring instrument that automatically calculates the distance from a precise perpendicular to the surface of the electrophotographic photosensitive member support in a non-contact manner can be used, for example, manufactured by Mitutoyo Corporation. It can be measured by a non-contact type universal roll diameter measuring device RA801 or the like.

<Electrophotographic photoreceptor>
The electrophotographic photoreceptor of the present invention is obtained by forming a photosensitive layer on the support for an electrophotographic photoreceptor produced by the production method of the present invention. Such a support may be formed with an anodized film, an undercoat layer, or a layer using these in combination.
The anodized film is formed on the support surface by anodization. Prior to the anodizing treatment, it is preferable to perform a degreasing treatment by various degreasing cleaning methods such as acid, alkali, organic solvent, surfactant, emulsion, electrolysis and the like. An anodized film is formed by an anodizing treatment in an ordinary method, for example, an acidic bath such as chromic acid, sulfuric acid, oxalic acid, boric acid, sulfamic acid, etc. Give good results. In the case of anodizing in sulfuric acid, the sulfuric acid concentration is 100 to 300 g / l, the dissolved aluminum concentration is 2 to 15 g / l, the liquid temperature is 15 to 30 ° C., the electrolysis voltage is 10 to 20 V, and the current density is 0.5. It is preferably set within the range of ˜2 A / dm ² , but is not limited thereto. The thickness of the anodic oxide film thus formed is usually 20 μm or less, preferably 10 μm or less, more preferably 7 μm or less.

  As the undercoat layer, a resin, a resin in which particles such as metal oxide (usually inorganic particles) are dispersed, or the like is used. Examples of metal oxide particles used for the undercoat layer include metal oxide particles containing one metal element such as titanium oxide, aluminum oxide, silicon oxide, zirconium oxide, zinc oxide, iron oxide, calcium titanate, titanium Examples thereof include metal oxide particles containing a plurality of metal elements such as strontium acid and barium titanate. One kind of these particles may be used alone, or a plurality of kinds of particles may be mixed and used.

  Among these metal oxide particles, titanium oxide and aluminum oxide are preferable, and titanium oxide is particularly preferable. The surface of the titanium oxide particles may be treated with an inorganic substance such as tin oxide, aluminum oxide, antimony oxide, zirconium oxide, or silicon oxide, or an organic substance such as stearic acid, polyol, or silicone. As the crystal form of the titanium oxide particles, any of rutile, anatase, brookite, and amorphous can be used. A thing of a several crystalline state may be contained.

In addition, various particle sizes of the metal oxide particles can be used. Among these, from the viewpoint of characteristics and liquid stability, the average primary particle size is usually 1 nm or more, preferably 10 nm or more, and usually 100 nm. Below, preferably 50 nm or less.
The undercoat layer is preferably formed in a form in which metal oxide particles are dispersed in a binder resin. Examples of the binder resin used for the undercoat layer include phenoxy, epoxy, polyvinyl pyrrolidone, polyvinyl alcohol, casein, polyacrylic acid, celluloses, gelatin, starch, polyurethane, polyimide, polyamide, and the like. Among these, alcohol-soluble copolymer polyamides, modified polyamides, etc. are excellent because of their excellent adhesion to the support, low solubility in the solvent used in the photosensitive layer coating solution, and good dispersibility and coating properties. Is preferred. In addition, the binder resin of an undercoat layer may be used individually by 1 type, and may use 2 or more types together by arbitrary combinations and ratios. Further, the binder resin can be used only in the binder resin or in a form cured with a curing agent.

In addition, the use ratio of the particles with respect to the binder resin can be arbitrarily selected, but it is usually preferable in the range of 10% by weight to 500% by weight in view of the stability of the dispersion and the coating property.
Further, the thickness of the undercoat layer can be arbitrarily selected, but is usually from 0.1 μm to 25 μm, preferably from 0.1 to 10 μm, more preferably from 0.2 to 5 μm, from the photoreceptor characteristics and applicability. It is. The undercoat layer may contain a known antioxidant or the like.

The photosensitive layer of the electrophotographic photosensitive member is provided on a conductive support, and if it has an undercoat layer, it is provided on the undercoat layer (that is, on the conductive support through the undercoat layer). .
The type of the photosensitive layer is usually a type (single layer type or dispersed type) photosensitive layer in which the charge generation material and the charge transport material are present in the same layer and dispersed or dissolved in the binder resin; A mold (laminated layer) in which a functional material is separated into two parts: a charge generation layer in which a generation material is dispersed or dissolved in a binder resin, and a charge transport layer in which a charge transport material is dispersed or dissolved in a binder resin. Type or function separation type) photosensitive layer. A photoreceptor having a single layer type photosensitive layer is a so-called single layer type photoreceptor, and a photoreceptor having a laminated type photosensitive layer is a so-called laminated type photoreceptor (or a function separation type photoreceptor). Any photosensitive layer may be used. Further, an overcoat layer (protective layer) may be provided on the photosensitive layer for the purpose of improving the chargeability and improving the wear resistance.

Further, as the laminated type photosensitive layer, a forward laminated type photosensitive layer in which a charge generation layer and a charge transport layer are laminated in this order from the support side, and a reverse lamination layer in which a charge transport layer and a charge generation layer are laminated in reverse order. Type photosensitive layer, any of which can be adopted. Among these, a forward laminated photosensitive layer that can exhibit the most balanced photoconductivity is preferable.
When the photosensitive layer has a single layer structure, a known material in which a photosensitive material is dispersed in a binder material is used. Examples thereof include a dye-sensitized ZnO photosensitive layer, a CdS photosensitive layer, and a photosensitive layer in which a charge generation material is dispersed in a charge transfer material. When the photosensitive layer has a laminated structure, each layer is provided in the order of a charge generation layer and a charge transfer layer on a support, preferably an anodized film or an undercoat layer.

  The charge generation layer of the multilayer photosensitive layer may be formed by a method such as vapor deposition of the charge generation material itself, but may be a layer containing the charge generation material and a binder resin. The charge generation material is not particularly limited as long as it is a material used for an electrophotographic photosensitive member. Specifically, selenium and its alloys, arsenic-selenium, cadmium sulfide, zinc oxide, and other inorganic photoconductors. Organic pigments such as phthalocyanine, azo, quinacridone, polycyclic quinone, perylene, indigo, and benzimidazole can be used. In particular, metals such as copper, indium chloride, potassium chloride, tin, oxytitanium, zinc, vanadium, or phthalocyanines, metal-free phthalocyanines coordinated with oxides or chlorides, or monoazo, bisazo, trisazo, polyazos Azo pigments such as are preferred. Of these, azo pigments or phthalocyanines are particularly preferable, and oxytitanium phthalocyanine having a specific crystal system is particularly preferable. This is because oxytitanium phthalocyanine is more susceptible to crystal conversion by heat than ordinary pigments.

  Examples of such oxytitanium phthalocyanine include those having a maximum diffraction peak at a Bragg angle (2θ ± 0.2) of 27.3 ° in X-ray diffraction by CuKα rays. This crystalline oxytitanium phthalocyanine is generally called Y-type or D-type. For example, FIG. 2 of Japanese Patent Application Laid-Open No. 62-67094 (referred to as type II in the same publication), Fig. 1 of JP-A-2-8256, Fig. 1 of JP-A-64-82045, Journal of Electrophotographic Society Vol. 92 (issued in 1990), No. 3, pages 250-258 (in the same publication) (Referred to as Y-type). This crystalline oxytitanium phthalocyanine is characterized by having a maximum diffraction peak at 27.3 °, but normally has peaks at 7.4 °, 9.7 °, and 24.2 °.

  The intensity of the diffraction peak may vary depending on the crystallinity, the orientation of the sample, and the measurement method. However, in the measurement by the Bragg-Brentano concentration method usually used when performing X-ray diffraction of a powder crystal, Type oxytitanium phthalocyanine has a maximum diffraction peak at 27.3 °. In addition, when measured by a thin film optical system (generally called thin film method or parallel method), 27.3 ° may not be the maximum diffraction peak depending on the state of the sample. This is probably because it is oriented in the direction.

  The dispersion medium is not particularly limited as long as it is used in the production process of the electrophotographic photosensitive member, and various solvents may be used. For example, ethers such as diethyl ether, dimethoxyethane, tetrahydrofuran and 1,2-dimethoxyethane; ketones such as acetone and methyl ethyl ketone; esters such as methyl acetate and ethyl acetate; alcohols such as methanol, ethanol and propanol alone Alternatively, two or more kinds can be mixed and used.

The amount of the dispersion medium to be used can be any amount as long as the dispersion can be sufficiently dispersed and an effective amount of the charge generation material is contained in the dispersion, and is usually 3 to 20 wt as the concentration of the charge generation material in the dispersion during dispersion. %, More preferably about 4 to 20 wt%.
The binder resin is not particularly limited as long as it is used for an electrophotographic photoreceptor, and specifically, polyvinyl butyral, polyvinyl acetal, polyester, polycarbonate, polystyrene, polyester carbonate, polysulfone, polyimide , Vinyl polymers such as polymethyl methacrylate and polyvinyl chloride, copolymers thereof, phenoxy, epoxy, silicone resins, and the like, or partially crosslinked cured products thereof can be used singly or in combination.

As a method for mixing the binder resin and the charge generating material, for example, a method in which the charge generating material is dispersed in the dispersion treatment step while the binder resin is powdered or its polymer solution is added and dispersed simultaneously, or the dispersion obtained in the dispersion treatment step Any method may be used such as a method of mixing the polymer solution into the binder resin polymer solution, or a method of mixing the polymer solution into the dispersion.
Next, the dispersion obtained here may be diluted with various solvents in order to obtain liquid properties suitable for coating. As such a solvent, the solvent illustrated as the said dispersion medium can be used, for example. The ratio between the charge generating material and the binder resin is not particularly limited, but generally the charge generating material is used in the range of 5 to 500 parts by weight with respect to 100 parts by weight of the resin. Moreover, a charge transport material can be included as required. Examples of the charge transport material include electron-withdrawing materials such as 2,4,7-trinitrofluorenone and tetracyanoxydimethane, and complex compounds such as selbazole, indole, imidazole, oxazole, pyrazole, oxadiazole, pyrazoline and thiadiazole. Examples thereof include an electron donating substance such as a ring compound, an aniline derivative, a hydrazone compound, an aromatic amine derivative, a stilbene derivative, or a polymer having a group composed of these compounds in the main chain or side chain. The ratio between the charge transport material and the binder resin is such that the charge transport material is in the range of 5 to 500 parts by weight with respect to 100 weight parts of the binder resin.

  Using the dispersion thus prepared, a charge generation layer is formed on a support, and a charge transport layer is laminated thereon to form a photosensitive layer, or a charge transport layer is formed on a support. Then, a charge generation layer is formed using the dispersion on the photosensitive layer to form a photosensitive layer, or a charge generation layer is formed on the support using the dispersion to form a photosensitive layer. A photosensitive layer can be formed. When the charge generation layer is laminated with the charge transport layer to form a photosensitive layer, the range of 0.1 μm to 10 μm is preferable, and the thickness of the charge transport layer is preferably 10 to 40 μm. When the photosensitive layer is formed with a single layer structure having only the charge generation layer, the thickness of the charge generation layer is preferably in the range of 5 to 40 μm.

  The charge transport layer of the multilayer photosensitive layer contains a charge transport material, a binder resin, and other components used as necessary. Specifically, such a charge transport layer is prepared by, for example, preparing a coating solution by dissolving or dispersing a charge transport material and a binder resin in a solvent. In addition, in the case of a reverse lamination type photosensitive layer, it can be obtained by coating and drying on a support (on the undercoat layer when an undercoat layer is provided).

  The charge transport material is not particularly limited, and any material can be used. Examples of charge transport materials include aromatic nitro compounds such as 2,4,7-trinitrofluorenone, cyano compounds such as tetracyanoquinodimethane, electron withdrawing materials such as quinone compounds such as diphenoquinone, carbazole derivatives, indoles Derivatives, imidazole derivatives, oxazole derivatives, pyrazole derivatives, thiadiazole derivatives, heterocyclic compounds such as benzofuran derivatives, aniline derivatives, hydrazone derivatives, aromatic amine derivatives, stilbene derivatives, butadiene derivatives, enamine derivatives and multiple types of these compounds bind Or an electron donating substance such as a polymer having a group consisting of these compounds in the main chain or side chain. Among these, carbazole derivatives, hydrazone derivatives, aromatic amine derivatives, stilbene derivatives, butadiene derivatives, enamine derivatives, and those in which a plurality of these compounds are bonded are preferable. Any one of these charge transport materials may be used alone, or two or more thereof may be used in any combination and ratio.

  As the binder resin used for the charge transport layer, any resin can be used as long as it is known to be usable for the charge transport layer of the electrophotographic photoreceptor. is there. A plurality of resins may be used in combination. Furthermore, the charge transport layer may be composed of a single layer, or may be a stack of a plurality of layers having different components or composition ratios. The photosensitive layer may contain various additives such as antioxidants and sensitizers used for the electrophotographic photoreceptor as necessary. The thickness of the charge transport layer is not particularly limited, but is usually 5 μm or more, preferably 10 μm or more, and usually 50 μm or less, preferably 45 μm or less, from the viewpoint of long life, image stability, and high resolution. Is in the range of 30 μm or less.

  In the present invention, the coating operation for forming each of the layers follows a conventionally known coating method. For example, a dipping method, a spray coating method, a spinner coating method, a blade coating method, or the like can be employed.

<Image forming apparatus>
An embodiment of an image forming apparatus using the electrophotographic photosensitive member of the present invention (an image forming apparatus of the present invention) will be described. However, the embodiment is not limited to the following description, and the gist of the present invention is described. Any modifications can be made without departing from the above.
Examples of the image forming apparatus using the electrophotographic photosensitive member of the present invention include a printer, a copying machine, and a facsimile. In this image forming apparatus, a charging device, a developing device, a fixing device, an electrophotographic photosensitive member, an optical unit, an exposure device, a hopper, a stacker, and a conveyance path for conveying a recording medium (paper) are provided.
The hopper provides a recording medium (paper) to the conveyance path. The stacker is a stack for storing recorded media (printed sheets). The conveyance path conveys a recording medium (paper). The fixing device fixes an image transferred from the electrophotographic photosensitive member to a recording medium (paper).

  The developing device performs development by applying a developer to the electrostatic latent image formed on the electrophotographic photosensitive member. The electrophotographic photosensitive member is to transfer an image developed by a developing device to a recording medium (paper) after creating an electrostatic latent image corresponding to an image to be obtained. The exposure apparatus scans the electrophotographic photosensitive member with a laser beam modulated by each image data (information) to form an electrostatic latent image.

Furthermore, it demonstrates in detail using FIG. 1 which shows the principal part structure of an apparatus.
As shown in FIG. 1, the image forming apparatus includes an electrophotographic photoreceptor 1, a charging device (charging means) 2, an exposure device (exposure means; image exposure means) 3, and a developing device (developing means) 4. Furthermore, a transfer device (transfer means) 5, a cleaning device (cleaning means) 6, and a fixing device (fixing means) 7 are provided as necessary.

The electrophotographic photosensitive member 1 is not particularly limited as long as it is the above-described electrophotographic photosensitive member. In FIG. 1, as an example, a drum-shaped photosensitive member having the above-described photosensitive layer formed on the surface of a cylindrical support is illustrated. Show. A charging device 2, an exposure device 3, a developing device 4, a transfer device 5, and a cleaning device 6 are arranged along the outer peripheral surface of the electrophotographic photoreceptor 1.
The charging device 2 charges the electrophotographic photosensitive member 1 and uniformly charges the surface of the electrophotographic photosensitive member 1 to a predetermined potential. In FIG. 1, a roller-type charging device (charging roller) is shown as an example of the charging device 2, but other corona charging devices such as corotron and scorotron, and contact-type charging devices such as charging brushes are often used.

  In many cases, the electrophotographic photosensitive member 1 and the charging device 2 are designed to be removable from the main body of the image forming apparatus as a cartridge including both of them (hereinafter, appropriately referred to as a photosensitive cartridge). For example, when the electrophotographic photoreceptor 1 or the charging device 2 deteriorates, the photoreceptor cartridge can be removed from the image forming apparatus main body, and another new photosensitive cartridge can be mounted on the image forming apparatus main body. ing. Also, the toner described later is often stored in the toner cartridge and designed to be removable from the main body of the image forming apparatus. When the toner in the used toner cartridge runs out, this toner cartridge is removed. It can be removed from the main body of the image forming apparatus and another new toner cartridge can be mounted. Further, a cartridge equipped with all of the electrophotographic photosensitive member 1, the charging device 2, and the toner may be used.

  The type of exposure apparatus 3 is not particularly limited as long as it can form an electrostatic latent image on the photosensitive surface of the electrophotographic photosensitive member 1 by performing exposure (image exposure) on the electrophotographic photosensitive member 1. Absent. Specific examples include halogen lamps, fluorescent lamps, lasers such as semiconductor lasers and He—Ne lasers, and LEDs (light emitting diodes). Further, exposure may be performed by a photoreceptor internal exposure method. The light at the time of exposure is arbitrary. For example, the exposure is performed with monochromatic light having a wavelength of 700 nm to 850 nm, monochromatic light having a wavelength of 600 nm to 700 nm, slightly short wavelength, or monochromatic light having a wavelength of 300 nm to 500 nm. Just do it.

In particular, in the case of an electrophotographic photoreceptor using a phthalocyanine compound as a charge generating substance, it is preferable to use monochromatic light having a wavelength of 700 nm to 850 nm, and in the case of an electrophotographic photoreceptor using an azo compound, white light or wavelength It is preferable to use monochromatic light of 700 nm or less.
The type of the developing device 4 is not particularly limited, and an arbitrary device such as a dry development method such as cascade development, one-component conductive toner development, two-component magnetic brush development, or a wet development method can be used. In FIG. 1, the developing device 4 includes a developing tank 41, an agitator 42, a supply roller 43, a developing roller 44, and a regulating member 45, and has a configuration in which toner T is stored inside the developing tank 41. . Further, a replenishing device (not shown) for replenishing the toner T may be attached to the developing device 4 as necessary. The replenishing device is configured to be able to replenish toner T from a container such as a bottle or a cartridge.

The supply roller 43 is formed from a conductive sponge or the like. The developing roller 44 is made of a metal roll such as iron, stainless steel, aluminum, or nickel, or a resin roll obtained by coating such a metal roll with a silicone resin, a urethane resin, a fluorine resin, or the like. The surface of the developing roller 44 may be smoothed or roughened as necessary.
The developing roller 44 is disposed between the electrophotographic photoreceptor 1 and the supply roller 43 and is in contact with the electrophotographic photoreceptor 1 and the supply roller 43, respectively. The supply roller 43 and the developing roller 44 are rotated by a rotation drive mechanism (not shown). The supply roller 43 carries the stored toner T and supplies it to the developing roller 44. The developing roller 44 carries the toner T supplied by the supply roller 43 and contacts the surface of the electrophotographic photosensitive member 1.

  The regulating member 45 is formed of a resin blade such as silicone resin or urethane resin, a metal blade such as stainless steel, aluminum, copper, brass, phosphor bronze, or a blade obtained by coating such metal blade with resin. The regulating member 45 contacts the developing roller 44 and is pressed against the developing roller 44 side with a predetermined force by a spring or the like (a general blade linear pressure is 5 to 500 g weight / cm). If necessary, the regulating member 45 may be provided with a function of imparting charging to the toner T by frictional charging with the toner T.

The agitator 42 is rotated by a rotation driving mechanism, and agitates the toner T and conveys the toner T to the supply roller 43 side. A plurality of agitators 42 may be provided with different blade shapes and sizes.
The type of the toner T is arbitrary, and in addition to the powdery toner, a polymerized toner using a suspension polymerization method, an emulsion polymerization method, or the like can be used. In particular, when a polymerized toner is used, a toner having a small particle diameter of about 4 to 8 μm is preferable, and the toner particles are used in various shapes ranging from a nearly spherical shape to a shape outside the spherical shape on the potato. be able to. The polymerized toner is excellent in charging uniformity and transferability and is suitably used for high image quality.

  The type of the transfer device 5 is not particularly limited, and an apparatus using an arbitrary system such as an electrostatic transfer method such as corona transfer, roller transfer, or belt transfer, a pressure transfer method, or an adhesive transfer method can be used. . Here, it is assumed that the transfer device 5 includes a transfer charger, a transfer roller, a transfer belt, and the like that are disposed to face the electrophotographic photoreceptor 1. The transfer device 5 applies a predetermined voltage value (transfer voltage) having a polarity opposite to the charging potential of the toner T, and transfers a toner image formed on the electrophotographic photosensitive member 1 to a recording paper (paper, medium, transfer target). Transfer to P.

  There is no restriction | limiting in particular about the cleaning apparatus 6, Arbitrary cleaning apparatuses, such as a brush cleaner, a magnetic brush cleaner, an electrostatic brush cleaner, a magnetic roller cleaner, a blade cleaner, can be used. The cleaning device 6 is for scraping off residual toner adhering to the photoreceptor 1 with a cleaning member and collecting the residual toner. However, when there is little or almost no toner remaining on the surface of the photoreceptor, the cleaning device 6 may be omitted.

  The fixing device 7 includes an upper fixing member (pressure roller) 71 and a lower fixing member (fixing roller) 72, and a heating device 73 is provided inside the fixing member 71 or 72. FIG. 1 shows an example in which a heating device 73 is provided inside the upper fixing member 71. Each of the upper and lower fixing members 71 and 72 includes a fixing roll in which a metal base tube such as stainless steel or aluminum is coated with silicon rubber, a fixing roll in which Teflon (registered trademark) resin is coated, and a fixing sheet. A member can be used. Further, each of the fixing members 71 and 72 may be configured to supply a release agent such as silicone oil in order to improve releasability, or may be configured to forcibly apply pressure to each other by a spring or the like.

When the toner transferred onto the recording paper P passes between the upper fixing member 71 and the lower fixing member 72 heated to a predetermined temperature, the toner is heated to a molten state and cooled after passing through the recording paper. Toner is fixed on P.
The type of the fixing device is not particularly limited, and a fixing device of any type such as heat roller fixing, flash fixing, oven fixing, pressure fixing, etc. can be provided including those used here.

In the electrophotographic apparatus configured as described above, an image is recorded as follows. That is, first, the surface (photosensitive surface) of the photoreceptor 1 is charged to a predetermined potential (for example, −600 V) by the charging device 2. At this time, charging may be performed by a DC voltage, or charging may be performed by superimposing an AC voltage on the DC voltage.
Subsequently, the photosensitive surface of the charged photoreceptor 1 is exposed by the exposure device 3 according to the image to be recorded, and an electrostatic latent image is formed on the photosensitive surface. The developing device 4 develops the electrostatic latent image formed on the photosensitive surface of the photoreceptor 1.

The developing device 4 thins the toner T supplied by the supply roller 43 with a regulating member (developing blade) 45 and has a predetermined polarity (here, the same polarity as the charging potential of the photosensitive member 1) and the negative polarity. ), And conveyed while being carried on the developing roller 44 to be brought into contact with the surface of the photoreceptor 1.
When the charged toner T carried on the developing roller 44 comes into contact with the surface of the photoreceptor 1, a toner image corresponding to the electrostatic latent image is formed on the photosensitive surface of the photoreceptor 1. This toner image is transferred onto the recording paper P by the transfer device 5. Thereafter, the toner remaining on the photosensitive surface of the photoreceptor 1 without being transferred is removed by the cleaning device 6.

After the transfer of the toner image onto the recording paper P, the final image is obtained by passing the fixing device 7 and thermally fixing the toner image onto the recording paper P.
In addition to the above-described configuration, the image forming apparatus may be configured to perform, for example, a static elimination process. The neutralization step is a step of neutralizing the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member, and a fluorescent lamp, an LED, or the like is used as the neutralizing device. In addition, the light used in the static elimination process is often light having an exposure energy that is at least three times that of the exposure light.

  The image forming apparatus may be further modified. For example, the image forming apparatus may be configured to perform a pre-exposure process, an auxiliary charging process, or the like, or may be configured to perform offset printing. A full-color image forming apparatus to be mounted may be used. The full-color image forming apparatus may have a single photosensitive system configuration in which an image of each color is formed using one electrophotographic photosensitive member, and the images are formed by superimposing them, or each color is dedicated. A multi-photoreceptor-type configuration represented by a full-color tandem system that includes a plurality of electrophotographic photoconductors may be employed.

  When full-color image formation is performed, the above-described image formation process is performed for each color to obtain a color image. When full-color image formation is performed, a developer such as toner adhering to the electrophotographic photosensitive member is once transferred to one intermediate transfer belt, and the toners of each color are combined in the form of an intermediate transfer belt. Then, a color image may be formed on a recording medium (paper) using a transfer unit.

The electrophotographic photosensitive member of the present invention is formed by forming a photosensitive layer on a cylindrical support having an outer diameter of 70 mm or more. Due to the size of the outer shape, the space around the electrophotographic photosensitive member is wide, and various types are available. There is an advantage that the degree of freedom of disposing the device is increased. Therefore, it is preferable to use a single photoconductor type full-color image forming apparatus that forms an image using one electrophotographic photoconductor.
The photosensitive member 1 is combined with one or more of the charging device 2, the exposure device 3, the developing device 4, the transfer device 5, the cleaning device 6, and the fixing device 7 to form an integrated cartridge (electrophotography). The electrophotographic photosensitive member cartridge may 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 charging device 2, the exposure device 3, the developing device 4, and the transfer device 5 can be integrally supported together with the photoreceptor 1 to form a cartridge. Also in this case, similarly to the cartridge described in the above embodiment, when the electrophotographic photosensitive member 1 and other members deteriorate, for example, the electrophotographic photosensitive member cartridge is removed from the main body of the image forming apparatus, and another new electrophotographic image is obtained. By attaching the photosensitive cartridge to the image forming apparatus main body, maintenance and management of the image forming apparatus are facilitated.

EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to a following example, unless the summary is exceeded.
(Example)
-Raw tube An extruded tube made of the JIS name 3003 alloy, extruded by the porthole method, with an outer diameter of 129.8 mm and a wall thickness of 3.92 mm is drawn, and the outer diameter is 121 mm, the length is 268 mm, and the wall thickness is 3 mm. A blank tube was prepared. Area due to a plane perpendicular to the virtual shaft of the extruded tube cross-sectional area by a plane perpendicular to the virtual shaft of 1550 mm ² base pipe, since the 1112Mm ^2, the cross-sectional area due to a plane perpendicular to the virtual shaft of the base pipe The difference in cross-sectional area due to the plane perpendicular to the virtual axis of the wrinkle before drawing is 28.3% with respect to the cross-sectional area due to the plane perpendicular to the virtual axis of the wrinkle before drawing.

-Heat treatment The raw tube subjected to the above drawing process was placed in an electric furnace set at 250 ° C and subjected to heat treatment for 4 hours. After the heat treatment, the heating was stopped and the furnace was naturally cooled. After the furnace temperature became 30 ° C. or lower, the heat-treated tube was taken out.

・ Cutting Using cutting oil (manufactured by Mitsubishi Oil Corporation, Metalwork ED, distillation end temperature: 249 ℃), using a flat cutting tool of natural diamond sintered body, cutting depth of 30μm, cutting feed The speed is 200 μm / rev. Then, the surface was machined and the edge was further machined to produce a support for an electrophotographic photosensitive member having an outer diameter of 120 mm, a length of 266 mm, and a wall thickness of 2.5 mm.

-Cylindricity of support The cylindricity of the obtained support was measured with a non-contact universal roll diameter measuring device RA801 manufactured by Mitutoyo Corporation.

(Example 2)
Except that a tube having a wall thickness of 3.71 mm (a cross-sectional area by a plane perpendicular to the imaginary axis of the extruded tube is 1467 mm ² and a difference in cross-sectional area is 24.8%) is used as the extruded tube, the same as in Example 1. A support was prepared. When the cylindricity of the obtained support was measured in the same manner as in Example 1, it was 15 μm.

(Example 3)
Except that a tube having a wall thickness of 3.42 mm (a cross-sectional area of a plane perpendicular to the imaginary axis of the extruded tube is 1356 mm ² and a difference in cross-sectional area is 18.0%) is used as the extruded tube, the same as in Example 1. A support was prepared. When the cylindricity of the obtained support was measured in the same manner as in Example 1, it was 14 μm.

(Comparative Example 1)
A support was prepared in the same manner as in Example 1 except that the furnace temperature during heat treatment was set to 180 ° C. and heat treatment was performed for 2.5 hours. When the cylindricity of the obtained support was measured in the same manner as in Example 1, it was 38 μm.

(Comparative Example 2)
A support was produced in the same manner as in Example 2 except that the furnace temperature during heat treatment was set to 180 ° C. and heat treatment was performed for 2.5 hours. When the cylindricity of the obtained support was measured in the same manner as in Example 1, it was 32 μm.

(Comparative Example 3)
A support was produced in the same manner as in Example 3 except that the furnace temperature during heat treatment was set to 180 ° C. and heat treatment was performed for 2.5 hours. When the cylindricity of the obtained support was measured in the same manner as in Example 1, it was 29 μm.

  Table 1 summarizes the cylindricity of the supports produced in Examples 1 to 3 and Comparative Examples 1 to 3.

Example 4
A support was produced in the same manner as in Example 1 except that the temperature of the furnace during heat treatment was set to 360 ° C. and heat treatment was performed for 2 hours. When the cylindricity of the obtained support was measured in the same manner as in Example 1, it was 15 μm.

(Comparative Example 4)
A support was produced in the same manner as in Example 1 except that the temperature of the furnace during the heat treatment was set to 180 ° C. and heat treatment was performed for 5 hours. When the cylindricity of the obtained support was measured in the same manner as in Example 1, it was 29 μm.
Table 2 summarizes the cylindricity of the supports prepared in Examples 1 and 4 and Comparative Examples 1 and 4.

(Example 5)
-Undercoat layer coating solution The undercoat layer coating solution was prepared as follows. That is, a rutile type titanium oxide having an average primary particle size of 40 nm (“TTO55N” manufactured by Ishihara Sangyo Co., Ltd.) and 3% by weight of methyldimethoxysilane (“TSL8117” manufactured by Toshiba Silicone Co., Ltd.) with respect to the titanium oxide were flowed at high speed. The surface-treated titanium oxide obtained by mixing in a high-speed mixing kneader (“SMG300” manufactured by Kawata Co., Ltd.) and mixing at high speed at a rotational peripheral speed of 34.5 m / sec has a weight ratio of methanol / 1-propanol. A dispersion slurry of hydrophobized titanium oxide was obtained by dispersing with a ball mill in a 7/3 mixed solvent. The dispersion slurry, a mixed solvent of methanol / 1-propanol / toluene, and ε-caprolactam [compound represented by the following formula (A)] / bis (described in Examples of JP-A-4-31870) / bis ( 4-amino-3-methylcyclohexyl) methane [compound represented by the following formula (B)] / hexamethylenediamine [compound represented by the following formula (C)] / decamethylene dicarboxylic acid [represented by the following formula (D) Compound] / octadecamethylenedicarboxylic acid [compound represented by the following formula (E)] is heated with a copolyamide pellet having a composition molar ratio of 60% / 15% / 5% / 15% / 5%. While stirring and mixing, the polyamide pellets are dissolved, and then ultrasonic dispersion treatment is performed to obtain methanol / 1-propanol / toluene. Weight ratio is 7/1/2, and hydrophobic treatment containing titanium oxide / copolymer polyamide in a weight ratio of 3/1, solid content concentration 18.0% of the coating liquid for an undercoat layer.

-Coating solution for charge generation layer In X-ray diffraction by CuKα characteristic X-ray, Bragg angles (2θ ± 0.2) 9.3 °, 10.6 °, 13.2 °, 20.8 °, 23.3 ° , 10 parts by weight of oxytitanium phthalocyanine showing a strong diffraction peak at 26.3 ° and 150 parts by weight of 4-methoxy-4-methyl-2-pentanone are mixed and pulverized in a sand grind mill for 4 hours to be atomized and dispersed. Processed. Subsequently, 100 parts by weight of a 5 wt% 1,2-dimethoxyethane solution of polyvinyl butyral (trade name Denkabutyral # 6000C, manufactured by Denki Kagaku Kogyo Co., Ltd.) is mixed with this finely divided dispersion treatment solution, 1,2-dimethoxyethane was mixed to produce a charge generation material dispersion A having a solid content of 3.5% by weight.

Next, in X-ray diffraction by CuKα characteristic X-ray, 10 parts by weight of oxytitanium phthalocyanine showing strong diffraction peaks at Bragg angles (2θ ± 0.2) of 9.6 °, 27.2 °, and 1,2-dimethoxy 140 parts by weight of ethane was mixed and pulverized with a sand grind mill for 2 hours for atomization dispersion treatment. Subsequently, this finely divided dispersion treatment liquid, 10 parts by weight of polyvinyl butyral (manufactured by Denki Kagaku Kogyo Co., Ltd., trade name “Denka Butyral” # 6000C), 487 parts by weight of 1,2-dimethoxyethane, 85 parts by weight of 4-Methoxy-4-methyl-2-pentanone was mixed to prepare a charge generation material dispersion B having a solid concentration of 3.5% by weight.
The resulting charge generation material dispersion A and charge generation material dispersion B were mixed at a weight ratio of 1: 4, and then subjected to ultrasonic dispersion treatment to produce a charge generation layer coating solution.

-Charge transport layer coating solution 57 parts by weight of a compound represented by the following formula (1), 3 parts by weight of a compound represented by the following formula (2), 1.5 parts by weight of a compound represented by the following formula (3), 8 parts by weight of a compound represented by the following formula (4), 1 part by weight of a compound represented by the following formula (5), 0.03 part by weight of silicone oil, and a polycarbonate resin (viscosity represented by the following formula (6)) 100 parts by weight of average molecular weight 30,200) was mixed with 640 parts by weight of a mixed solvent of tetrahydrofuran and toluene (80% by weight of tetrahydrofuran, 20% by weight of toluene) to prepare a coating solution for forming a charge transport layer.

  On the support for the electrophotographic photosensitive member produced in Example 1, the undercoat layer coating solution was dip-coated so that the film thickness after drying was 1.25 μm to form an undercoat layer, On the undercoat layer, the charge generation layer coating solution was formed by dip coating so that the film thickness after drying was 0.4 μm. Further, on the charge generation layer, the coating solution for charge transport layer was dip-coated so that the film thickness after drying was 21 μm, so that a multilayer electrophotographic photosensitive member A was produced.

(Comparative Example 5)
An electrophotographic photoreceptor B was produced in the same manner as in Example 5 except that the electrophotographic photoreceptor support prepared in Comparative Example 1 was used as the electrophotographic photoreceptor support.

(Comparative Example 6)
An electrophotographic photoreceptor C was produced in the same manner as in Example 5 except that the electrophotographic photoreceptor support prepared in Comparative Example 4 was used as the electrophotographic photoreceptor support.
The obtained electrophotographic photoreceptors A, B, and C were mounted on a full color image forming apparatus CLP-500 manufactured by Samsung Electronics Co., Ltd., a full color image was formed, and the degree of color shift of the formed image was visually evaluated. . The results are shown in Table 3 below.

  It can be applied to electrophotographic apparatuses such as printers, facsimiles, and copiers, and can provide a high-sensitivity electrophotographic photosensitive member with high sensitivity and low residual potential.

1 is a schematic diagram illustrating a main configuration of an embodiment of an image forming apparatus of the present invention.

Explanation of symbols

1 Photoconductor (Electrophotographic photoconductor)
2 Charging device (charging roller; charging unit)
3 Exposure equipment (exposure section)
4 Development device (development unit)
5 Transfer device
6 Cleaning device (cleaning part)
7 Fixing device
41 Developer tank
42 Agitator
43 Supply roller
44 Developing roller
45 Restriction member
71 Upper fixing member (pressure roller)
72 Lower fixing member (fixing roller)
73 Heating device
T Toner
P Recording paper (paper, medium)

Claims (8)

  In a method for producing a cylindrical electrophotographic photosensitive member support having an outer diameter of 70 mm or more produced by subjecting an aluminum alloy element tube formed through extrusion to a cutting process, the aluminum alloy element tube, A method for producing a support for an electrophotographic photosensitive member, wherein heat treatment is performed at 190 ° C to 550 ° C before cutting.   The method for producing a support for an electrophotographic photosensitive member according to claim 1, wherein the aluminum alloy tube contains 0.5 wt% or more and 2.0 wt% or less of manganese.   The method for producing a support for an electrophotographic photosensitive member according to claim 1, wherein the duration of the heat treatment is 2 hours or more and 6 hours or less.   The method for producing a support for an electrophotographic photosensitive member according to any one of claims 1 to 3, wherein the aluminum alloy tube is formed through a drawing process.   The difference between the cross-sectional area of the surface of the aluminum alloy pipe perpendicular to the virtual axis and the cross-sectional area of the surface perpendicular to the virtual axis of the punch before drawing is due to the plane perpendicular to the virtual axis of the punch before drawing. The method for producing a support for an electrophotographic photosensitive member according to claim 4, which is 20% or more with respect to the cross-sectional area.   The support for electrophotographic photoreceptors manufactured by the manufacturing method of any one of Claims 1-5.   An electrophotographic photosensitive member obtained by forming a photosensitive layer on the support for an electrophotographic photosensitive member according to claim 6.   An image forming apparatus on which the electrophotographic photosensitive member according to claim 7 is mounted.

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