JP2005156605A - Method for forming image and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for forming an image and an image forming apparatus by which production of paper powder from a coated paper and deposition of the paper powder on the surface of an electrophotographic photoreceptor are sufficiently prevented and an image with high picture quality and sharpness can be stably obtained. <P>SOLUTION: The method for forming an image includes steps of preparing a photoreceptor, preparing a coated paper, charging, exposing, developing and transferring. The photoreceptor is used and has a conductive supporting body and a photosensitive layer in which a layer containing an arylate resin containing a mixture including a polymer having one or more kinds of repeating units expressed by general formulae (I) to (IV) is disposed in the farthest side from the conductive supporting body. The coated paper used comprises a substrate and a coating layer, the coating layer contains an adhesive containing latex having ≥20°C glass transition temperature and a pigment, and shows ≥10% gloss on the surface where the coating layer is disposed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an image forming method and an image forming apparatus.

  As an electrophotographic image forming method, there is known a method in which charging, exposure, development, and transfer are sequentially performed using an electrophotographic photosensitive member. In recent years, such an image forming method has started to be applied to a part of a printing area with the progress of digitization and colorization, and in particular, the practical use in the graphic arts market including on-demand printing is remarkable. Here, the graphic arts market refers to the overall production-related business market for printed materials such as prints, which are printed in a small number of copies, original reproductions such as handwriting and painting, copying, or mass production called re-production. It is a market that targets industries and sectors related to the production of printed materials.

  Also, the practical use of an image forming method using an electrophotographic method is remarkable in the short run market (light printing market). In the short-run market, not only monochrome printing but also electrophotographic non-print printing has been used to develop a technology that targets color printing (represented by Fuji Xerox Color Docu Tech 60). A great progress is being made in paper compatibility, product price, price per sheet, etc. (Non-Patent Document 1).

The graphic arts market and the short run market demand higher clarity of image quality, and improve the vividness of the coated paper coated with pigments and adhesives to prevent the penetration of printing ink into the paper. Therefore, many coated papers having high white paper gloss are used (see, for example, Patent Documents 1 and 2).
JP-A-5-341553 JP 2000-66437 A “Journal of the Imaging Society of Japan”, The Imaging Society of Japan, 2001, Vol. 40, no. 2

  However, when image formation is performed using coated paper, paper dust on the coated paper is generated and adheres to the surface of the electrophotographic photosensitive member, and image loss may occur due to a decrease in the charging potential of the electrophotographic photosensitive member. is there. In the conventional image forming method, a cleaning process may be provided for the purpose of removing residual toner from the surface of the electrophotographic photosensitive member after transfer. However, such a method sufficiently removes paper dust. It is difficult to do.

  The present invention has been made in view of such a situation, and sufficiently prevents the occurrence of paper dust on the coated paper and the adhesion of the paper dust to the surface of the electrophotographic photosensitive member. An object of the present invention is to provide an image forming method and an image forming apparatus capable of stably obtaining the above.

  In order to achieve the above object, the present inventors first examined the causes of paper dust and adhesion to the surface of the electrophotographic photosensitive member in the conventional image forming method using coated paper, and found the following knowledge. Got.

  That is, in the conventional coated paper, the surface of the paper is coated with latex as a white pigment and an adhesive agent for the pigment in order to prevent ink penetration and develop gloss. In this conventional coated paper, since latex having a glass transition temperature lower than room temperature is generally used, the latex of the coated paper becomes paper dust and adheres to the photoconductor, causing poor cleaning.

  Also, pigments such as kaolin clay and talc are used to adjust the opacity and whiteness of the coated paper. However, these pigments cause paper dust. In particular, the electrophotographic method often uses a roll feeder method utilizing frictional force, and has many sliding parts. In the electrophotographic system, a high electric field is formed in the transfer process. For this reason, these pigments tend to become paper dust. The paper dust adheres to the surface of the photoconductor and causes a loss of image in order to lower the charged potential of the photoconductor. In particular, kaolin clay and talc with crystal water tend to cause image omission. This phenomenon is particularly likely to occur under high temperature and high humidity conditions where the toner component is likely to absorb moisture and the electrical resistivity of kaolin clay or talc itself is likely to be reduced.

［式（Ｉ）中、Ｗ_１は芳香環を有する２価の有機基を示し、Ｒ^１及びＲ^２はそれぞれ独立に水素原子、置換若しくは未置換の炭化水素基又は置換若しくは未置換の複素環基を示し、Ｒ^３及びＲ^４はそれぞれ独立にハロゲン原子又は置換若しくは未置換の炭化水素基を示し、ｋ_１及びｋ_２は０〜４の整数を示す。］

［式（ＩＩ）中、Ｗ_２は芳香環を有する２価の有機基を示し、Ｘは単環又は多環を有する２価の有機基を示し、Ｒ^５及びＲ^６はそれぞれ独立にハロゲン原子又は置換若しくは未置換の炭化水素基を示し、ｋ_３及びｋ_４は０〜４の整数を示す。］

［式（ＩＩＩ）中、Ｗ_３は芳香環を有する２価の有機基を示し、Ｒ^７及びＲ^８はそれぞれ独立にハロゲン原子又は置換若しくは未置換の炭化水素基を示し、ｋ_５及びｋ_６は０〜４の整数を示す。］

［式（ＩＶ）中、Ｗ_４は芳香環を有する２価の有機基を示し、Ｙ_１及びＹ_２はそれぞれ独立にアルキレン基を示し、Ｒ^９〜Ｒ^１２はそれぞれ独立に水素原子、置換若しくは未置換の炭化水素基又は置換若しくは未置換の複素環基を示し、Ｒ^１３及びＲ^１４はそれぞれ独立にハロゲン原子又は置換若しくは未置換の炭化水素基を示し、ｋ_７及びｋ_８は０〜４の整数を示し、ｎは０〜１５０の整数を示す。］ Therefore, the image forming method of the present invention comprises a conductive support and a photosensitive layer disposed on the conductive support, and the following general formula (I) is provided on the farthest side of the photosensitive layer from the conductive support: (II), (III) or (IV) an electrophotographic photosensitive member preparing step for preparing an electrophotographic photosensitive member provided with an arylate resin-containing layer containing a polymer having one or more repeating units represented by (IV);
A coating layer disposed on at least one surface of the substrate and the substrate, the coating layer containing an adhesive and a pigment containing a latex having a glass transition temperature of 20 ° C. or higher, and the coating layer is disposed A coated paper preparation step of preparing a coated paper having a glossiness of 10% or more on the other side;
A charging step for charging the electrophotographic photosensitive member;
Exposing the charged electrophotographic photoreceptor to form an electrostatic latent image; and
A developing step of developing the electrostatic latent image with toner to form a toner image;
A transfer step of transferring a toner image onto the surface of the coated paper having a glossiness of 10% or more;
It is characterized by having.

[In Formula (I), W ₁ represents a divalent organic group having an aromatic ring, and R ¹ and R ² are each independently a hydrogen atom, a substituted or unsubstituted hydrocarbon group, or a substituted or unsubstituted heterocyclic ring. R ³ and R ⁴ each independently represent a halogen atom or a substituted or unsubstituted hydrocarbon group, and k ₁ and k _{2 each} represent an integer of 0 to 4. ]

[In Formula (II), W ₂ represents a divalent organic group having an aromatic ring, X represents a divalent organic group having a monocyclic or polycyclic ring, and R ⁵ and R ⁶ are each independently a halogen atom. or a substituted or indicate the unsubstituted hydrocarbon group, k ₃ and k ₄ represent an integer of 0 to 4. ]

[In Formula (III), W ₃ represents a divalent organic group having an aromatic ring, R ⁷ and R ⁸ each independently represent a halogen atom or a substituted or unsubstituted hydrocarbon group, and k ₅ and k ₆ Represents an integer of 0 to 4. ]

[In Formula (IV), W ₄ represents a divalent organic group having an aromatic ring, Y ₁ and Y ₂ each independently represent an alkylene group, and R ^{9 to} R ¹² each independently represent a hydrogen atom, substituted or An unsubstituted hydrocarbon group or a substituted or unsubstituted heterocyclic group; R ¹³ and R ¹⁴ each independently represents a halogen atom or a substituted or unsubstituted hydrocarbon group; and k ₇ and k ₈ are 0 to 4 N represents an integer of 0 to 150. ]

  Here, the glossiness means glossiness measured in accordance with “75-degree specular gloss test method for paper and paperboard” defined in JIS P8142.

  In the present invention, a photoconductor having the specific coating layer, using a coated paper having a glossiness of 10% or more, and having the specific arylate resin-containing layer on the side farthest from the conductive support of the photosensitive layer. Can suppress the occurrence of paper dust on the coated paper, and even if a small amount of paper dust is generated, it can sufficiently prevent adhesion to the surface of the photoconductor and stabilize images with high image clarity. Can be obtained. The arylate resin-containing layer contains the specific polymer (either a homopolymer or a copolymer), and is therefore effective in maintaining the charging potential of the electrophotographic photosensitive member constant. It is thought that. Further, the polymer has a rigid molecular structure, and this molecular structure is considered to be effective in improving the mechanical strength of the electrophotographic photosensitive member of the present invention.

  In the present invention, the allylate resin-containing layer is a copolymer having one or more of the repeating units represented by the general formula (I), (II) or (III) and the repeating unit represented by the general formula (IV). Mixtures and / or mixtures of one or more homopolymers having a repeating unit represented by formula (I), (II) or (III) and a homopolymer having a repeating unit represented by formula (IV) It is preferable to contain.

  By using as an essential component the homopolymer having the repeating unit represented by the general formula (IV) in the copolymer and the repeating unit represented by the general formula (IV) in the mixture as an essential component. The ability to remove body deposits can be improved. Furthermore, by using the specific combination, the charged potential of the electrophotographic photosensitive member can be kept constant with higher accuracy.

  In the present invention, the coating layer preferably contains kaolin clay and / or talc. In the present invention, since the coating layer of the coated paper contains an adhesive containing a latex having a glass transition temperature of 20 ° C. or higher, even if kaolin clay or talc is contained in the coated layer, they are paper. It's hard to become confused. Therefore, the pigment can be used as appropriate for improving the glossiness, and the image quality sharpness can be further improved.

  Moreover, in this invention, it is preferable that an arylate resin content layer further contains a fluorine resin fine particle, and content of a fluorine resin fine particle is 3 to 40 weight% on the basis of the solid content whole quantity of the said arylate resin content layer. It is more preferable. By further containing fluorine resin fine particles, the releasability of the electrophotographic photosensitive member is improved, and by adjusting the content of fluorine resin fine particles to the above range, the fluorine resin fine particles are uniformly dispersed in the layer. It becomes possible to make it. Therefore, the effect of preventing the paper dust of the coated paper from adhering to the surface of the electrophotographic photosensitive member can be further improved.

  Moreover, in this invention, it is preferable that the said arylate resin content layer further contains a fluorine-type polymer. By containing the fluorine-based polymer in the arylate resin-containing layer, the dispersion uniformity of the fluorine-based resin fine particles can be further improved. Therefore, the effect of preventing the paper dust of the coated paper from adhering to the surface of the electrophotographic photosensitive member can be further improved.

  In the present invention, the transfer process may be an intermediate transfer type transfer process in which the toner image is transferred onto the surface of the coated paper having a glossiness of 10% or more through the intermediate transfer member.

The image forming apparatus of the present invention includes a conductive support and a photosensitive layer disposed on the conductive support, and the general formula (I), the farthest side of the photosensitive layer from the conductive support, An electrophotographic photosensitive member provided with an arylate resin-containing layer containing a polymer having one or more repeating units represented by (II), (III) or (IV);
A charging device for charging the electrophotographic photoreceptor;
An exposure apparatus that exposes the charged electrophotographic photosensitive member to form an electrostatic latent image; and
A developing device for developing the electrostatic latent image with toner to form a toner image;
A coating layer disposed on at least one surface of the substrate and the substrate, the coating layer containing an adhesive and a pigment containing a latex having a glass transition temperature of 20 ° C. or higher, and the coating layer A transfer device for transferring the toner image onto the surface of the coated paper having a glossiness of 10% or more on the surface on which it is disposed;
It is characterized by having.

  In the image forming apparatus of the present invention, the arylate resin-containing layer is represented by one or more repeating units represented by the general formula (I), (II), or (III) and the general formula (IV). A copolymer having a repeating unit and / or one or more homopolymers having a repeating unit represented by the above general formula (I), (II) or (III) and a repeating represented by the above general formula (IV) It is preferable to contain a mixture with a homopolymer having units.

  In the image forming apparatus of the present invention, the transfer device is an intermediate transfer type transfer device that transfers the toner image onto a surface of the coated paper having a glossiness of 10% or more via an intermediate transfer member. Preferably there is.

  According to the present invention, the occurrence of paper dust on the coated paper and the adhesion of the paper dust to the surface of the electrophotographic photosensitive member are sufficiently prevented, and image loss is unlikely to occur even under high temperature and high humidity. It is possible to stably obtain a high image. Therefore, the image forming method and the image forming apparatus of the present invention are very useful in the graphic arts market and the short run market.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as the case may be. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a schematic diagram showing a preferred embodiment of the image forming apparatus of the present invention. An image forming apparatus 100 shown in FIG. 1 is a tandem type, and is a so-called intermediate transfer type image forming apparatus. The image forming apparatus 100 includes four image forming units 120a, 120b, 120c, and 120d. The four image forming units 120 a to 120 d are arranged in parallel along a part of the intermediate transfer body 108.

  Here, each of the image forming units 120a to 120d includes drum-shaped electrophotographic photoreceptors 1a to 1d, and the electrophotographic photoreceptors 1a to 1d have a predetermined circumference in a predetermined direction (counterclockwise on the paper surface). It can be rotated at a speed (process speed). The electrophotographic photoreceptor will be described in detail later.

  For each of the electrophotographic photoreceptors 1a to 1d, charging devices 103a to 103d, developing devices 102a to 102d, primary transfer devices 104a to 104d, and cleaning devices 106a to 106d are sequentially arranged along the rotation direction. . The developing devices 102a to 102d can be supplied with toners of four colors, yellow (Y), magenta (M), cyan (C), and black (K), contained in a toner cartridge (not shown). Color images can be formed as well as images. Further, the primary transfer devices 104a to 104d are in contact with the electrophotographic photosensitive members 1a to 1d via the intermediate transfer member 108, respectively.

  The developing devices 102a to 102d are arranged in the order of Y, M, C, and K toner colors in FIG. The arrangement of the toner colors can be set in an appropriate order according to the image forming method of the system, such as M, Y, C, and K.

  Further, an exposure device 107 (ROS; Raser Output Scanner) is disposed at a predetermined position of the image forming apparatus 100. Laser light emitted from the exposure device 107 is branched into laser light 105a to 105d, and irradiated onto the surfaces of the electrophotographic photoreceptors 1a to 1d after charging in the image forming units 120a to 120d. . Thus, the charging, exposure, development, primary transfer, and cleaning processes are sequentially performed in the rotation process of the electrophotographic photoreceptors 1a to 1d, and the toner images of the respective colors are transferred onto the intermediate transfer body 108 in an overlapping manner.

  The intermediate transfer member 108 is supported with a predetermined tension by a drive roll 114, a backup roll 113, and a tension roll 115. By the rotation of these rolls, the intermediate transfer member 108 can be rotated at the same peripheral speed as the electrophotographic photoreceptors 1a to 1d without causing deflection. A part of the intermediate transfer member 108 located between the drive roll 114 and the backup roll 113 is in contact with the electrophotographic photoreceptors 1a to 1d.

  Further, the secondary transfer device 109 is disposed so as to contact the backup roll 113 via the intermediate transfer member 108. The surface of the intermediate transfer member 108 that has passed between the backup roll 113 and the secondary transfer device 109 is cleaned by a cleaning blade (not shown) disposed in the vicinity of the drive roll 114, for example, and then the next image. Subject to the forming process.

  A tray 111 is provided at a predetermined position in the image forming apparatus 100. The tray 111 contains coated paper, which will be described later, as the transfer medium 112. The transfer medium 112 in the tray 111 is placed between the secondary transfer device 109 and the backup roll 113 by a transport device (not shown). Be transported. The transfer medium 112 is further sequentially transferred between two fixing rolls 110 that are in contact with each other, and is discharged to the outside of the image forming apparatus 100.

  The transport device for the coated paper in the tray 111 has a configuration capable of blowing an air flow to the cross-sections of the coated paper stacked in the tray 111 and can be used even under high humidity conditions. The effect is improved and stable conveyance becomes possible.

  Hereinafter, an image forming method of the present invention using the above-described image forming apparatus 100 will be described.

  First, an electrophotographic photosensitive member and coated paper (transfer medium) are prepared (electrophotographic photosensitive member preparation step, coated paper preparation step). In the image forming apparatus 100, when the electrophotographic photoreceptors 1a to 1d are rotationally driven, the charging devices 103a to 103d are driven in conjunction therewith. Then, the surfaces of the electrophotographic photoreceptors 1a to 1d are uniformly charged to a predetermined polarity and potential (charging process). Next, the electrophotographic photoreceptors 1a to 1d whose surfaces are uniformly charged are exposed imagewise by laser beams 105a to 105d emitted from the exposure device 107, and electrostatic latent images are formed on the surfaces of the photoreceptors 1a to 1d. Is formed (exposure process).

  The electrostatic latent image is developed with toner from the developing devices 102a to 102d to form a toner image (developing process). The toner at this time may be a two-component toner or a one-component toner.

  This toner image is formed by the primary transfer bias applied to the intermediate transfer member 108 from the primary transfer devices 104a to 104d in the process of passing through the interface (nip portion) between the photoreceptors 1a to 1d and the intermediate transfer member 108. By the applied electric field, primary (intermediate) transfer is sequentially performed on the outer peripheral surface of the intermediate transfer member 108 (primary (intermediate) transfer step). The primary transfer bias applied from the photoreceptors 1a to 1d to the intermediate transfer member 8 is applied from a bias power source with a polarity (+) opposite to that of the toner. The applied voltage is, for example, in the range of +2 kV to +5 kV.

  In this way, different color toner images are superimposed and transferred to the intermediate transfer member 108 by the image forming units 120a to 120d, and a color toner image is formed. This toner image is transferred from the intermediate transfer body 108 to the transfer medium 112 by the contact charging action by the secondary transfer device 109 (secondary transfer process), and the color toner image is fixed to the transfer medium 112 by the fixing roll 110. A color image is formed. In the present invention, the toner image is transferred onto the surface of the coated paper, which is the transfer medium 112, having a glossiness of 10% or more. Therefore, the image definition is sufficiently improved.

  Hereinafter, the electrophotographic photosensitive member and the coated paper applied to the image forming apparatus 100 described above will be described.

  The electrophotographic photosensitive member includes a conductive support and a photosensitive layer that is disposed on the conductive support and has an arylate resin-containing layer on the side farthest from the conductive support. Here, the arylate resin-containing layer is a layer containing a specific polymer described later. The photosensitive layer may basically have a single layer structure or a layered structure in which the charge generation layer and the charge transport layer are functionally separated. In the case of a laminated structure, the charge generation layer and the charge transport layer may be stacked in any order.

  Hereinafter, preferred examples of the electrophotographic photoreceptor will be described in detail. 2 to 4 are schematic cross-sectional views each showing a preferred example of an electrophotographic photosensitive member. The electrophotographic photoreceptor shown in FIGS. 2 to 3 includes a photosensitive layer 3 having a function separated into a layer containing a charge generating material (charge generating layer 5) and a layer containing a charge transporting material (charge transporting layer 6). It is to be prepared. In FIG. 4, the charge generation material and the charge transport material are contained in the same layer (single-layer type photosensitive layer 8).

  The electrophotographic photoreceptor 1 shown in FIG. 2 has a structure in which an undercoat layer 4, a charge generation layer 5, and a charge transport layer 6 are sequentially laminated on a conductive support 2, and the charge transport layer 6 is arylated. It is a resin-containing layer. The electrophotographic photoreceptor 1 shown in FIG. 3 has a structure in which an undercoat layer 4, a charge generation layer 5, a charge transport layer 6, and a protective layer 7 are sequentially laminated on a conductive support 2. The protective layer 7 is an arylate resin-containing layer. Further, the electrophotographic photoreceptor 1 shown in FIG. 4 has a structure in which an undercoat layer 4, a single-layer type photosensitive layer 8, and a protective layer 7 are sequentially laminated on a conductive support 2. Is an arylate resin-containing layer.

Next, each element of the electrophotographic photoreceptor 1 will be described in detail with reference to FIG.
Examples of the conductive support 2 include a metal drum such as aluminum, copper, iron, stainless steel, zinc, and nickel; aluminum, copper, gold, silver, platinum, palladium, titanium, a base such as a sheet, paper, plastic, and glass; Deposited metal such as nickel-chromium, stainless steel, copper-indium; Deposited conductive metal compound such as indium oxide and tin oxide on the base; Laminated metal foil on the base; Carbon Examples thereof include black, indium oxide, tin oxide-antimony oxide powder, metal powder, copper iodide and the like dispersed in a binder resin, applied onto the substrate, and subjected to a conductive treatment. The shape of the conductive support 2 may be any of a drum shape, a sheet shape, and a plate shape.

  When a metal pipe substrate is used as the conductive support 2, even if the surface of the substrate remains a raw tube, mirror cutting, etching, anodizing, rough cutting, centerless grinding, sand blasting, wet honing, etc. This process may be performed.

  It is also possible to use a conductive plastic base material in which conductive fine particles such as carbon black particles, metal fine powder, and metal oxide fine particles are dispersed in a binder resin and formed into a pipe shape by a centrifugal molding or an extrusion molding machine. it can.

  However, in order to obtain high-quality images, anodized aluminum substrate surface or a dispersion-type undercoat layer that has obtained carrier blocking properties by dispersing and coating metal oxide fine particles on an aluminum substrate. Is preferred.

  Anodization of the surface of the aluminum substrate can be performed as follows. First, pure aluminum or aluminum alloy can be used as the base aluminum. For example, the material symbols 1000 series, 3000 series, 6000 series aluminum or aluminum alloy specified in JIS-H4080 are preferable. The anodized film is formed by anodizing various metals and various alloys in an electrolyte solution. Among these, a film called alumite formed by anodizing aluminum or an aluminum alloy in an electrolyte solution is suitable for the photoreceptor used in this embodiment.

  The alumite film has high carrier blocking properties, and is particularly excellent in preventing point defects (black spots, background stains) that occur when used in reversal development (negative, positive development). It is also excellent in that the current leakage phenomenon from the contact charger, which is likely to occur during contact charging, can be prevented.

The anodizing treatment is performed in an acidic bath such as chromic acid, sulfuric acid, oxalic acid, phosphoric acid, boric acid, sulfamic acid. Of these, treatment with a sulfuric acid bath is most suitable. As an example of the treatment conditions, sulfuric acid concentration: 10 to 20%, bath temperature: 5 to 25 ° C., current density: 1 to 4 A / dm ² , electrolysis voltage: 5 to 30 V, treatment time: about 5 to 60 minutes Although it is usually performed under conditions, it is not limited to this. The anodic oxide film thus formed is porous, highly insulating, and has a very unstable surface. For this reason, the physical property value of the film tends to change after the film is formed. In order to avoid this, the anodized film is usually further sealed. Examples of the sealing treatment include a method of immersing the anodized film in an aqueous solution containing nickel fluoride and nickel acetate, a method of immersing the anodized film in boiling water, and a method of treating with pressurized steam. Of these, the most common method is immersion in an aqueous solution containing nickel acetate.

  Subsequent to the sealing treatment, the anodic oxide film is washed. The main purpose of this is to remove extraneous substances such as metal salts adhering to the sealing treatment. If such excessive metal salt or the like remains excessively on the surface of the conductive support (anodized film), the quality of the coating film (such as the undercoat layer 4) formed on the anodized film is adversely affected. Furthermore, since a low-resistance component generally remains, it also causes a background stain. The cleaning process may be performed with pure water once, but usually, multistage cleaning is performed. At this time, it is preferable that the final cleaning liquid is as clean as possible (deionized). Moreover, it is desirable to perform physical rubbing cleaning with a contact member in at least one of the multi-stage cleaning processes.

  The film thickness of the anodized film formed as described above is preferably 3 to 15 μm. In the anodic oxide film, a layer called a barrier layer exists under the porous anodic oxide layer. The thickness of the barrier layer is preferably 1 to 100 nm in this system.

  When the thickness of the anodized film is less than 3 μm, the barrier effect as the anodized film tends to be insufficient. On the other hand, if it exceeds 15 μm, the time constant as an electrode becomes too large, and there is a tendency that residual potential is generated, the repetitive characteristics are deteriorated, and the response of the photoreceptor is deteriorated.

  An undercoat layer 4 is preferably formed on the conductive support 2 in order to improve wettability during coating of an upper layer (such as the charge generation layer 5) or to enhance blocking properties. The undercoat layer 4 is a layer called a carrier blocking layer or an anodized layer.

  Examples of the material for the undercoat layer 4 include a binder resin (polymer resin compound) and an organometallic compound.

  Examples of the binder resin include acetal resins such as polyvinyl butyral, polyvinyl alcohol resin, casein, polyamide resin, cellulose resin, gelatin, polyurethane resin, polyester resin, methacrylic resin, acrylic resin, polyvinyl chloride resin, polyvinyl acetate resin, vinyl chloride. -Vinyl acetate-maleic anhydride resin, silicone resin, silicone-alkyd resin, phenol-formaldehyde resin, melamine resin and the like. These can be used alone or in combination of two or more. In addition, when combining, it can be used as a mixture or a polycondensate.

  Examples of the organometallic compound include those containing zirconium, titanium, aluminum, manganese, silicon atoms and the like. More specifically, a silicon compound, an organic zirconium compound, an organic titanium compound, an organic aluminum compound, and the like can be given. These can be used alone or in combination of two or more. In addition, when combining, it can be used as a mixture or a polycondensate. Among the organometallic compounds, an organometallic compound containing zirconium or silicon is preferable because it has excellent performance such as low residual potential, little potential change due to environment, and little potential change due to repeated use.

  Examples of the silicon compound in the organometallic compound include vinyltrimethoxysilane, γ-methacryloxypropyl-tris (β-methoxyethoxy) silane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ- Glycidoxypropyltrimethoxysilane, vinyltriacetoxysilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, N-β- (Aminoethyl) -γ-aminopropylmethylmethoxysilane, N, N-bis (β-hydroxyethyl) -γ-aminopropyltriethoxysilane, γ-chloropropyltrimethoxysilane and the like can be mentioned. Particularly preferably used silicon compounds are vinyltriethoxysilane, vinyltris (2-methoxyethoxysilane), 3-methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 2- (3,4-epoxycyclohexyl). ) Ethyltrimethoxysilane, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, 3-aminopropyltriethoxysilane, N- Examples include silane coupling agents such as phenyl-3-aminopropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, and 3-chloropropyltrimethoxysilane.

  Examples of the organic zirconium compound include zirconium butoxide, zirconium zirconium acetoacetate, zirconium triethanolamine, acetylacetonate zirconium butoxide, ethyl acetoacetate butoxide, zirconium acetate, zirconium oxalate, zirconium lactate, zirconium phosphonate, zirconium octoate, Zirconium naphthenate, zirconium laurate, zirconium stearate, zirconium isostearate, methacrylate zirconium butoxide, stearate zirconium butoxide, isostearate zirconium butoxide.

  Examples of the organic titanium compound include tetraisopropyl titanate, tetranormal butyl titanate, butyl titanate dimer, tetra (2-ethylhexyl) titanate, titanium acetylacetonate, polytitanium acetylacetonate, titanium octylene glycolate, and titanium lactate ammonium salt. , Titanium lactate, titanium lactate ethyl ester, titanium triethanolamate, and polyhydroxytitanium stearate.

  Examples of the organoaluminum compound include aluminum isopropylate, monobutoxy aluminum diisopropylate, aluminum butyrate, diethyl acetoacetate aluminum diisopropylate, and aluminum tris (ethyl acetoacetate).

  The undercoat layer 4 can be formed by preparing a coating solution for forming an undercoat layer using the above materials, applying the coating solution on the conductive support 2 and drying it.

  Various additives can be used in the coating liquid for forming the undercoat layer in order to improve electrical characteristics, environmental stability, and image quality.

  Additives include quinone compounds such as chloranil, bromoanil and anthraquinone, tetracyanoquinodimethane compounds, fluorenones such as 2,4,7-trinitrofluorenone and 2,4,5,7-tetranitro-9-fluorenone Compound, 2- (4-biphenyl) -5- (4-t-butylphenyl) -1,3,4-oxadiazole, 2,5-bis (4-naphthyl) -1,3,4-oxadi Azoles, oxadiazole compounds such as 2,5-bis (4-diethylaminophenyl) -1,3,4-oxadiazole, xanthone compounds, thiophene compounds, 3,3 ′, 5,5′-tetra- Electron transport materials such as diphenoquinone compounds such as t-butyldiphenoquinone, electron transport pigments such as polycyclic condensation systems and azo systems, zirconium chelate compounds, Hexafluorophosphate chelate compounds, aluminum chelate compounds, titanium alkoxide compounds, organic titanium compounds, there can be used a known material such as a silane coupling agent.

  The silane coupling agent is used for the surface treatment of metal oxide fine particles, which will be described later, but it can also be used as an additive added to the coating solution. As a specific example of the silane coupling agent used here, the same coupling agent used for the surface treatment of metal oxide fine particles can be used.

  Examples of the zirconium chelate compound include zirconium butoxide, zirconium zirconium acetoacetate, zirconium triethanolamine, acetylacetonate zirconium butoxide, ethyl acetoacetate butoxide, zirconium acetate, zirconium oxalate, zirconium lactate, zirconium phosphonate, zirconium octoate, Zirconium naphthenate, zirconium laurate, zirconium stearate, zirconium isostearate, methacrylate zirconium butoxide, stearate zirconium butoxide, isostearate zirconium butoxide.

  Examples of the titanium chelate compound include tetraisopropyl titanate, tetranormal butyl titanate, butyl titanate dimer, tetra (2-ethylhexyl) titanate, titanium acetylacetonate, polytitanium acetylacetonate, titanium octylene glycolate, and titanium lactate ammonium salt. , Titanium lactate, titanium lactate ethyl ester, titanium triethanolamate, and polyhydroxytitanium stearate.

  Examples of the aluminum chelate compound include aluminum isopropylate, monobutoxy aluminum diisopropylate, aluminum butyrate, diethyl acetoacetate aluminum diisopropylate, and aluminum tris (ethyl acetoacetate).

  These compounds can be used individually by 1 type or in combination of 2 or more types.

  Examples of the solvent used in the coating solution for forming the undercoat layer include known organic solvents, for example, aromatic hydrocarbon solvents such as toluene and chlorobenzene, methanol, ethanol, n-propanol, iso-propanol, n-butanol and the like. Aliphatic alcohol solvents, ketone solvents such as acetone, cyclohexanone and 2-butanone, halogenated aliphatic hydrocarbon solvents such as methylene chloride, chloroform and ethylene chloride, cyclic such as tetrahydrofuran, dioxane, ethylene glycol and diethyl ether or Examples include linear ether solvents, and ester solvents such as methyl acetate, ethyl acetate, and n-butyl acetate. Moreover, these solvents can be used individually by 1 type or in combination of 2 or more types. When these solvents are mixed, any solvent can be used as long as it can dissolve the binder resin as the mixed solvent.

  As a method for dispersing the coating liquid, a media disperser such as a ball mill, a vibration ball mill, an attritor, a sand mill, a horizontal sand mill, or a medialess disperser such as a stirrer, an ultrasonic disperser, a roll mill, or a high pressure homogenizer can be used. Furthermore, examples of the high-pressure homogenizer include a collision method in which the dispersion is dispersed by liquid-liquid collision or liquid-wall collision in a high-pressure state, and a penetration method in which a fine flow path is dispersed in a high-pressure state. .

  As a coating method, a usual method such as a dip coating method, a ring coating method, a wire bar coating method, a spray coating method, a blade coating method, a knife coating method, or a curtain coating method can be used.

  The undercoat layer 4 formed using the coating solution preferably has a thickness of 0.1 to 3 μm. When the film thickness exceeds 3 μm, the electrical barrier becomes too strong and tends to cause an increase in potential due to desensitization or repetition.

  In addition, the undercoat layer 4 has a certain film thickness while preventing the accumulation of residual charges by appropriately adjusting the resistance value of the coating film by dispersing a metal oxide having an appropriate resistance value in the resin. There is also a type of undercoat layer (dispersed undercoat layer) that improves the leak resistance of the photoreceptor, particularly the ability to prevent leaks during contact charging. In this case, by dispersing the resistance control agent, it is possible to make the film thicker than that of the structure described above, and the film is used with a larger film thickness.

  Examples of the dispersed subbing layer include metal powders such as aluminum, copper, nickel, and silver, conductive metal oxides such as antimony oxide, indium oxide, tin oxide, and zinc oxide, carbon fiber, carbon black, and graphite powder. And the like, in which a conductive substance or the like is dispersed in a binder resin and coated on the conductive support 2.

As the conductive metal oxide, fine particles having an average particle size of 0.5 μm or less are preferably used. Here, the average particle size means an average primary particle size. The undercoat layer needs to obtain an appropriate resistance for obtaining leak resistance. Therefore, the conductive metal oxide fine particles preferably have a powder resistance of 10 ² to 10 ¹¹ Ω · cm. Among them, it is preferable to use conductive metal oxide fine particles such as tin oxide, titanium oxide, and zinc oxide having the above resistance values. If the powder resistance is less than 10 ² Ω · cm, sufficient leakage resistance tends not to be obtained. On the other hand, if it exceeds 10 ¹¹ Ω · cm, there is a tendency to increase the residual potential. .

  Moreover, 2 or more types of electroconductive metal oxide fine particles can also be mixed and used. Furthermore, the resistance of the powder can be controlled by subjecting the metal oxide fine particles to a surface treatment with a coupling agent. As the coupling agent that can be used in this case, the same materials as those described in the case of the non-dispersed undercoat layer described above can be used.

  Specific coupling agents include vinyltrimethoxysilane, γ-methacryloxypropyl-tris (β-methoxyethoxy) silane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyl. Trimethoxysilane, vinyltriacetoxysilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, N-β- (aminoethyl) Examples thereof include silane coupling agents such as -γ-aminopropylmethylmethoxysilane, N, N-bis (β-hydroxyethyl) -γ-aminopropyltriethoxysilane, and γ-chloropropyltrimethoxysilane. Moreover, these coupling agents can be used individually by 1 type or in combination of 2 or more types.

  As the surface treatment method, any known method can be used, but a dry method or a wet method is preferable. When surface treatment is performed by a dry method, a metal oxide fine particle is stirred with a mixer having a large shearing force or the like, or a coupling agent dissolved in an organic solvent or water is added dropwise together with dry air or nitrogen gas. It is uniformly processed by spraying. The addition or spraying is preferably performed at a temperature of 50 ° C. or higher. After addition or spraying, baking can be performed at 100 ° C. or higher.

  Baking can be carried out under any conditions as long as the temperature and time allow the desired electrophotographic characteristics to be obtained. In the dry method, it is preferable to remove the surface adsorbed water by heating and drying the metal oxide fine particles before the surface treatment with the coupling agent. By removing the surface adsorbed water before the surface treatment, the coupling agent can be uniformly adsorbed on the surface of the metal oxide fine particles.

  As a wet method, the metal oxide fine particles are stirred in a solvent and dispersed using an ultrasonic wave, a sand mill, an attritor, a ball mill or the like. Further, after the coupling agent solution is added and stirred or dispersed, the solvent is removed to uniformly treat. After removing the solvent, baking can be performed at 100 ° C. or higher. Baking can be carried out under any conditions as long as the temperature and time allow the desired electrophotographic characteristics to be obtained. Even in the wet method, the surface adsorbed water of the metal oxide fine particles can be removed before the surface treatment with the coupling agent. As this surface adsorbed water removal method, in addition to heat drying similar to the dry method, a method of removing while stirring and heating in a solvent used for the surface treatment, a method of removing by azeotropy with the solvent, and the like can be carried out.

  It is essential that the amount of the surface treatment agent with respect to the metal oxide fine particles is an amount capable of obtaining desired electrophotographic characteristics.

The electrophotographic characteristics are affected by the amount of the surface treatment agent attached to the metal oxide fine particles after the surface treatment. In the case of a silane coupling agent, the adhesion amount is determined from the Si intensity in the fluorescent X-ray analysis and the main metal element intensity of the metal oxide. A preferable Si intensity in the fluorescent X-ray analysis is in the range of 1.0 × 10 ^{−5 to} 1.0 × 10 ⁻³ of the main metal element strength of the metal oxide. When the Si intensity is less than 1.0 × 10 ⁻⁵ , image defects such as fog tend to occur easily. On the other hand, when it exceeds 1.0 × 10 ⁻³ , the density decreases due to the increase in residual potential. It tends to be easy to do.

  As the binder resin in this dispersion type undercoat layer, acetal resins such as polyvinyl butyral, polyvinyl alcohol resin, casein, polyamide resin, cellulose resin, gelatin, polyurethane resin, polyester resin, methacrylic resin, acrylic resin, polyvinyl chloride resin , Polyvinyl acetate resin, vinyl chloride-vinyl acetate-maleic anhydride resin, silicone resin, silicone-alkyd resin, phenol resin, phenol-formaldehyde resin, melamine resin, urethane resin and other known polymer resin compounds, and charge transport properties A charge transporting resin having a group or a conductive resin such as polyaniline can be used. Of these, resins insoluble in the upper coating solvent are preferably used, and phenol resins, phenol-formaldehyde resins, melamine resins, urethane resins, epoxy resins, and the like are particularly preferably used.

  The ratio between the metal oxide fine particles and the binder resin in the dispersion type undercoat layer forming coating solution can be arbitrarily set within a range in which desired electrophotographic photoreceptor characteristics can be obtained.

  The method for dispersing the metal oxide fine particles can be performed by the same method as the above-described dispersion method. The coating method for forming the dispersion-type undercoat layer can also be performed by the same method as described above.

  The thickness of the dispersion-type undercoat layer thus formed is preferably 3 μm or more, more preferably 5 to 30 μm. Furthermore, it is preferable that the dispersive undercoat layer has a resin or filler configuration with a Vickers strength of 35 or more in order to improve leakage resistance.

  Further, the surface roughness of the dispersive undercoat layer is about λ from 1 / (4n) times the exposure laser wavelength λ used (n is the refractive index of the upper layer) in order to prevent interference fringe images by the laser light source. In some cases, it is adjusted to have a roughness of. In order to adjust the surface roughness, resin particles can be added to the dispersion-type undercoat layer. As the resin particles, silicone resin particles, cross-linked PMMA resin particles, and the like can be used. In addition, the undercoat layer can be polished to adjust the surface roughness. As a polishing method, buffing, sandblasting, wet honing, grinding, or the like can be used.

The charge generation layer 5 includes a charge generation material.
Examples of the charge generation material include amorphous selenium, crystalline selenium, selenium-tellurium alloy, selenium-arsenic alloy, other selenium compounds, selenium alloys, amorphous silicon, cadmium sulfide and other inorganic photoconductors, and these Dye sensitized; various phthalocyanine pigments such as metal-free phthalocyanine, titanyl phthalocyanine, copper phthalocyanine, tin phthalocyanine, gallium phthalocyanine, naphthalocyanine pigment, squalium, anthanthrone, perylene, azo, trisazo, anthraquinone Various organic pigments and dyes such as those based on pyrenes, pyrenes, pyrylium salts and thiapyrylium salts are used. These organic pigments generally have several crystal types. In particular, for phthalocyanine pigments, various crystal types are known, including α-type, β-type, etc., but any of these crystal types can be used as long as it is a pigment that can obtain sensitivity and other characteristics suitable for the purpose. It is possible.

  In the present embodiment, the following compounds are particularly suitable as charge generation materials that can provide excellent performance. For example, a crystal having diffraction peaks at least at 7.6 °, 10.0 °, 25.2 °, and 28.0 ° at a Bragg angle (2θ ± 0.2 °) of an X-ray diffraction spectrum using CuKα rays. Hydroxygallium phthalocyanine typified by a mold; at least 7.3 °, 16.5 °, 25.4 ° and 28.1 at the Bragg angle (2θ ± 0.2 °) of the X-ray diffraction spectrum using CuKα ray Chlorgallium phthalocyanine typified by a crystal form having a diffraction peak at °; at least 9.5 °, 24.2 °, and 27 at a Bragg angle (2θ ± 0.2 °) of an X-ray diffraction spectrum using CuKα rays And titanyl phthalocyanine represented by a crystal form having a diffraction peak at 3 °.

  Depending on the crystal shape and measurement method, the intensity and position of these peaks may slightly deviate from these values. However, if the X-ray diffraction patterns basically match, it can be determined that they are the same crystal type.

  The charge generation layer 5 is formed by vacuum-depositing a charge generation material on the undercoat layer 4 or by preparing a coating solution for forming a charge generation layer together with an organic solvent and a binder resin, and applying the charge generation layer 5 on the undercoat layer 4. It is formed by.

  Examples of the binder resin used when preparing the coating solution for forming the charge generation layer include the following. For example, polycarbonate resin such as bisphenol A type or bisphenol Z type, and copolymers thereof, polyarylate resin, polyester resin, methacrylic resin, acrylic resin, polyvinyl chloride resin, polystyrene resin, polyvinyl acetate resin, styrene-butadiene copolymer Combined resin, vinylidene chloride-acrylonitrile copolymer resin, vinyl chloride-vinyl acetate-maleic anhydride resin, silicone resin, silicon-alkyd resin, phenol-formaldehyde resin, styrene-alkyd resin, poly-N-vinylcarbazole, etc. is there. These binder resins can be used alone or in combination of two or more.

  Moreover, a well-known thing can be used for the organic solvent used when preparing the coating liquid for charge generation layer formation.

  The blending ratio (weight ratio) between the charge generating material and the binder resin in preparing the charge generating layer forming coating solution is preferably in the range of 10: 1 to 1:10. As a method for dispersing the charge generating material in the resin, methods such as a roll mill, a ball mill, a vibrating ball mill, an attritor, a dyno mill, a sand mill, and a colloid mill can be used. The coating method of the coating solution can be performed by a normal method.

  The film thickness of the charge generation layer 5 formed by the method described above is preferably 0.01 to 5.0 μm, more preferably 0.05 to 2.0 μm.

  The charge transport layer 6 includes a charge transport material and a binder resin. As shown in FIG. 2, in the electrophotographic photoreceptor 1, the charge transport layer 6 is provided on the side farthest from the conductive support 2 of the photosensitive layer 3 so as to be in contact with the transfer medium.

  Examples of the charge transport material include the following. Oxadiazole derivatives such as 2,5-bis (p-diethylaminophenyl) -1,3,4-oxadiazole, 1,3,5-triphenyl-pyrazoline, 1- [pyridyl- (2)]-3 -(P-diethylaminostyryl) -5- (p-diethylaminostyryl) pyrazoline and other pyrazoline derivatives, triphenylamine, tri (p-methyl) phenylamine, N, N-bis (3,4-dimethylphenyl) biphenyl- Aromatic tertiary amino compounds such as 4-amine, dibenzylaniline, 9,9-dimethyl-N, N-di (p-tolyl) fluorenon-2-amine, N, N′-diphenyl-N, N ′ Aromatic tertiary diamino compounds such as bis (3-methylphenyl)-[1,1-biphenyl] -4,4′-diamine, 3- (4′-dimethylaminopheny ) -5,6-di- (4′-methoxyphenyl) -1,2,4-triazine, 1,2,4-triazine derivatives, 4-diethylaminobenzaldehyde-1,1-diphenylhydrazone, 4-diphenylamino Benzaldehyde-1,1-diphenylhydrazone, [p- (diethylamino) phenyl] (1-naphthyl) phenylhydrazone, 1-pyrenephenylhydrazone, 9-ethyl-3-[(2-methyl-1-indolinylimino) methyl Carbazole, 4- (2-methyl-1-indolinyliminomethyl) triphenylamine, 9-methyl-3-carbazole diphenylhydrazone, 1,1-di- (4,4′-methoxyphenyl) acrylaldehyde diphenylhydrazone , Β, β-bis (methoxyphenyl) vinyldiphenylhydride Hydrazone derivatives such as zon, quinazoline derivatives such as 2-phenyl-4-styryl-quinazoline, benzofuran derivatives such as 6-hydroxy-2,3-di (p-methoxyphenyl) -benzofuran, p- (2,2-diphenyl) Hole transport materials such as α-stilbene derivatives such as vinyl) -N, N-diphenylaniline, enamine derivatives, carbazole derivatives such as N-ethylcarbazole, poly-N-vinylcarbazole and derivatives thereof.

  Quinone compounds such as chloranil, bromoanil, anthraquinone, tetracyanoquinodimethane compounds, fluorenone compounds such as 2,4,7-trinitrofluorenone, 2,4,5,7-tetranitro-9-fluorenone, 2- ( 4-biphenyl) -5- (4-t-butylphenyl) -1,3,4-oxadiazole, 2,5-bis (4-naphthyl) -1,3,4-oxadiazole, 2,5 -Oxadiazole compounds such as bis (4-diethylaminophenyl) -1,3,4-oxadiazole, xanthone compounds, thiophene compounds, 3,3 ', 5,5'-tetra-t-butyldiphenoxy Electron transport materials such as diphenoquinone compounds such as non, 3,5-dimethyl-3 ′, 5′-di-t-butyl-4, 4′-diphenoquinone. Moreover, the polymer etc. which have the group which consists of a compound shown above in the principal chain or a side chain are mentioned. These charge transport materials can be used alone or in combination of two or more.

  As binder resin, the polymer which has 1 or more types of the repeating unit shown by the following general formula (I), (II), (III) or (IV) is contained.

［式（Ｉ）中、Ｗ_１は芳香環を有する２価の有機基を示し、Ｒ^１及びＲ^２はそれぞれ独立に水素原子、置換若しくは未置換の炭化水素基又は置換若しくは未置換の複素環基を示し、Ｒ^３及びＲ^４はそれぞれ独立にハロゲン原子又は置換若しくは未置換の炭化水素基を示し、ｋ_１及びｋ_２は０〜４の整数を示す。］

[In Formula (I), W ₁ represents a divalent organic group having an aromatic ring, and R ¹ and R ² are each independently a hydrogen atom, a substituted or unsubstituted hydrocarbon group, or a substituted or unsubstituted heterocyclic ring. R ³ and R ⁴ each independently represent a halogen atom or a substituted or unsubstituted hydrocarbon group, and k ₁ and k _{2 each} represent an integer of 0 to 4. ]

［式（ＩＩ）中、Ｗ_２は芳香環を有する２価の有機基を示し、Ｘは単環又は多環を有する２価の有機基を示し、Ｒ^５及びＲ^６はそれぞれ独立にハロゲン原子又は置換若しくは未置換の炭化水素基を示し、ｋ_３及びｋ_４は０〜４の整数を示す。］

[In Formula (II), W ₂ represents a divalent organic group having an aromatic ring, X represents a divalent organic group having a monocyclic or polycyclic ring, and R ⁵ and R ⁶ are each independently a halogen atom. or a substituted or indicate the unsubstituted hydrocarbon group, k ₃ and k ₄ represent an integer of 0 to 4. ]

［式（ＩＩＩ）中、Ｗ_３は芳香環を有する２価の有機基を示し、Ｒ^７及びＲ^８はそれぞれ独立にハロゲン原子又は置換若しくは未置換の炭化水素基を示し、ｋ_５及びｋ_６は０〜４の整数を示す。］

[In Formula (III), W ₃ represents a divalent organic group having an aromatic ring, R ⁷ and R ⁸ each independently represent a halogen atom or a substituted or unsubstituted hydrocarbon group, and k ₅ and k ₆ Represents an integer of 0 to 4. ]

［式（ＩＶ）中、Ｗ_４は芳香環を有する２価の有機基を示し、Ｙ_１及びＹ_２はそれぞれ独立にアルキレン基を示し、Ｒ^９〜Ｒ^１２はそれぞれ独立に水素原子、置換若しくは未置換の炭化水素基又は置換若しくは未置換の複素環基を示し、Ｒ^１３及びＲ^１４はそれぞれ独立にハロゲン原子又は置換若しくは未置換の炭化水素基を示し、ｋ_７及びｋ_８は０〜４の整数を示し、ｎは０〜１５０の整数を示す。］

[In Formula (IV), W ₄ represents a divalent organic group having an aromatic ring, Y ₁ and Y ₂ each independently represent an alkylene group, and R ^{9 to} R ¹² each independently represent a hydrogen atom, substituted or An unsubstituted hydrocarbon group or a substituted or unsubstituted heterocyclic group; R ¹³ and R ¹⁴ each independently represents a halogen atom or a substituted or unsubstituted hydrocarbon group; and k ₇ and k ₈ are 0 to 4 N represents an integer of 0 to 150. ]

In the above formula (I), the divalent organic group having an aromatic ring of W ₁ includes an arylene group. More specific examples of the arylene group include arylene groups represented by the following formulas (V-1) to (V-8). Of these, a phenylene group is preferable.

In the above formulas (V-1) to (V-8), R ^{21 to} R ³¹ and R ^{35 to} R ³⁶ are an alkyl group (more preferably an alkyl group having 1 to 10 carbon atoms) or an aryl group (preferably a carbon number). 1 to 20 aryl groups), or a substituent containing a silicon atom or a fluorine atom (preferably an organic group containing a silicon atom or a fluorine atom, more preferably —Si (Me) ₃ , —CF ₃ ), and R ³² to R ³⁴ is a substituted or unsubstituted alkylene group (more preferably an alkylene group having 1 to 10 carbon atoms) shows a, Z is substituted or unsubstituted alkylene group (more preferably an alkylene group having 1 to 20 carbon atoms), An arylene group (more preferably an arylene group having 6 to 20 carbon atoms), a divalent group containing a silicon atom or a fluorine atom, a divalent group represented by the following formula (VI-1), or (VI-2) P1, p5, p8, p11, p15 and p16 are integers of 0 to 4, p2, p3 and p6 are integers of 0 to 3, p4, p9, p10 and p12-p14 shows the integer of 0-2, p7 shows the integer of 0-1.

In the above formula (VI-1), R ³⁷ and R ³⁸ are a hydrogen atom, an alkyl group (more preferably an alkyl group having 1 to 10 carbon atoms), an aryl group (preferably an aryl group having 1 to 20 carbon atoms), or an -CF _3. In the above formula (VI-2), R ³⁹ represents an alkylene group (more preferably an alkylene group having 1 to 10 carbon atoms).

In the above formula (I), the unsubstituted hydrocarbon group for R ¹ and R ² is preferably an aliphatic hydrocarbon group or an aromatic hydrocarbon group, more preferably a linear or branched alkyl group. A group (preferably an alkyl group having 1 to 6 carbon atoms), a cycloalkyl group (preferably a cycloalkyl group having 3 to 6 carbon atoms) or an aryl group (preferably an aryl group having 6 to 12 carbon atoms). In addition, the substituted hydrocarbon group is preferably one substituted with a halogen atom or the above linear or branched alkyl group. The substituted heterocyclic group is preferably a group substituted with a halogen atom or the above linear or branched alkyl group.

In the above formula (I), the unsubstituted hydrocarbon group of R ³ and R ⁴ is preferably an aliphatic hydrocarbon group or an aromatic hydrocarbon group, more preferably a linear or branched alkyl group. A group (preferably an alkyl group having 1 to 6 carbon atoms), a cycloalkyl group (preferably a cycloalkyl group having 3 to 6 carbon atoms) or an aryl group (preferably an aryl group having 6 to 12 carbon atoms). In addition, the substituted hydrocarbon group is preferably one substituted with a halogen atom or the above linear or branched alkyl group.

In the above formula (II), examples of the divalent organic group having an aromatic ring of W ₂ include the same as those of W _1, and the monocyclic or polycyclic group in the divalent organic group having a monocyclic or polycyclic group of X The ring may be a hydrocarbon ring group or a heterocyclic group. In addition, as a heterocyclic group, the thing similar to the unsubstituted heterocyclic group of said R < ¹ > and R < ² > is mentioned. The divalent organic group X is more preferably any one selected from the following (VII-1) to (VII-5).

In the above formula (VII-1), R ⁴⁰ represents an alkylene group (preferably an alkylene group having 1 to 15 carbon atoms). In the formula ^{(VII-2), R 41} is a hydrocarbon group (preferably an alkyl group having 1 to 6 carbon atoms) indicates, q1 is an integer of 1-8. In the formula ^{(VII-3), R 42} is a hydrocarbon group (preferably an alkyl group having 1 to 6 carbon atoms) indicates, q2 is an integer of 1 to 10.

Preferred examples of R ⁵ and R ^{6 in} the above formula (II) and preferred examples of R ⁷ and R ^{8 in} the above formula (III) are the same as those of R ³ and R ^{4 in} the above formula (I). Is mentioned. In addition, examples of the divalent organic group having an aromatic ring of W _{3 in} the above formula (III) include the same as those of W ₁ .

Examples of the divalent organic group having an aromatic ring of W _{4 in} the above formula (IV) include those similar to W ₁ . Y ₁ and Y ₂ in the above formula (IV) are preferably an alkylene group having 1 to 6 carbon atoms, and the unsubstituted hydrocarbon group of R ^{9 to} R ¹² is preferably an aliphatic hydrocarbon group or aromatic A hydrocarbon group, more preferably a linear or branched alkyl group (preferably an alkyl group having 1 to 6 carbon atoms), a cycloalkyl group (preferably a cycloalkyl group having 3 to 6 carbon atoms) or An aryl group (preferably an aryl group having 6 to 12 carbon atoms), more preferably a methyl group or a phenyl group. In addition, the substituted hydrocarbon group is preferably one substituted with a halogen atom or the above linear or branched alkyl group. Examples of the substituted or unsubstituted heterocyclic group for R ^{9 to} R ¹² include the same groups as R ¹ and R ^{2 in} the above formula (I). Preferable examples of R ¹³ and R ^{14 in} the above formula (IV) include the same as R ³ and R ^{4 in} the above formula (I).

Specific examples of the repeating unit represented by the general formula (I) include those represented by the following formulas (I-1) to (I-24). In the following formula, the position of the carbonyl carbon bonded to the rightmost benzene ring may be any of the o-position, m-position and p-position. Moreover, as a polymer which has a repeating unit shown by the said general formula (I), the single unit which has what the position of carbonyl carbon is m position among the repeating units shown by the following formula (I-1), for example It may be a polymer, or may be a copolymer of a carbonyl carbon at the m-position and a carbonyl carbon at the p-position. Hereinafter, the same applies to polymers having repeating units represented by the general formulas (II) to (IV).

  Specific examples of the repeating unit represented by the general formula (II) include those represented by the following formulas (II-1) to (II-13).

  Specific examples of the repeating unit represented by the general formula (III) include those represented by the following formulas (III-1) to (III-8). In the chemical formula, t-Bu means a t-butyl group.

  Specific examples of the repeating unit represented by the general formula (IV) include those represented by the following formulas (IV-1) to (IV-4).

  The arylate resin as a binder resin may be a homopolymer containing the specific repeating unit or a copolymer in which the specific repeating unit is combined. Moreover, the mixture containing 2 or more types of the homopolymer containing the said specific repeating unit, the mixture of 2 or more types of copolymers, the mixture of a homopolymer and 2 or more types of copolymers, 2 or more types of single It may be a mixture of a polymer and two or more types of copolymers.

  In the copolymer having the specific repeating unit, it is preferable that the repeating unit represented by the general formula (I) and / or (II) is contained as a main component. Moreover, when the repeating unit shown by general formula (III) and / or (IV) is contained, it can be anticipated that the effect of improving the abrasion resistance and the adhesion removal ability of the paper component will be higher. In the copolymer having the above repeating unit, the repeating unit represented by the general formula (I) and / or (II) is represented by 0 to 95 mol% in the copolymer, represented by the general formula (III) and / or (IV). The repeating unit to be used is preferably used in the range of 0 to 50 mol% in the copolymer.

  Further, as the binder resin, a copolymer having at least one repeating unit represented by the general formula (I), (II) or (III) and a repeating unit represented by the general formula (IV) and / or A mixture containing at least one homopolymer having a repeating unit represented by formula (I), (II) or (III) and a homopolymer having a repeating unit represented by formula (IV) is preferred. Among the copolymers, a copolymer having a repeating unit represented by the general formulas (I), (II) and (IV), and a repeating represented by the general formulas (II), (III) and (IV). More preferred are copolymers having units. By using such a copolymer, the charging potential of the electrophotographic photosensitive member can be maintained constant, and the post-exposure potential of the electrophotographic photosensitive member can also be maintained constant.

  The molecular weight of the polymer used in the present invention is appropriately selected depending on the film forming conditions such as the film thickness of the photosensitive layer and the solvent, but is usually 3000 to 300,000 in terms of viscosity average molecular weight, more preferably 20,000 to 200,000. The range is appropriate.

  In addition to the above-described arylate resin, any other binder resin can be used as the binder resin used for the charge transport layer. However, a binder resin that is compatible with the charge transport material and has an appropriate strength is desirable. Examples of other binder resins include carbonate resins, styrene resins, and acrylic resins having various structures having a repeating unit represented by the following general formula (VIII).

［上記式（ＶＩＩＩ）中、Ｒ^５０は２価の有機基を示す。］

[In the above formula (VIII), R ⁵⁰ represents a divalent organic group. ]

  The charge transport layer 6 can be formed by applying a charge transport layer forming coating solution in which the above-described charge transport material and binder resin are dissolved in a suitable solvent on the charge generation layer and drying. Here, the blending ratio of the charge transport material and the binder resin is preferably 10: 1 to 1: 5.

  Examples of the solvent used in the coating solution for forming the charge transport layer include aromatic hydrocarbons such as benzene, toluene and chlorobenzene, ketones such as acetone and 2-butanone, methylene chloride, chloroform and ethylene chloride. Halogenated aliphatic hydrocarbons, cyclic or linear ethers such as tetrahydrofuran, dioxane, ethylene glycol, and diethyl ether, or mixed solvents thereof can be used.

  A small amount of silicone oil can also be added to the coating solution as a leveling agent for improving the smoothness of the coating film.

  The charge transport layer 6 preferably contains fluororesin fine particles. The fluorine resin fine particles are fine particles containing a fluorine resin. Here, the fluororesin is a resin containing fluorine atoms. More specifically, among tetrafluoroethylene resin, trifluoroethylene chloride resin, hexafluoropropylene resin, vinyl fluoride resin, vinylidene fluoride resin, difluorodifluoroethylene resin and copolymers thereof. It is preferable to use 1 type alone in combination of 2 or more types. Among the above, the fluororesin is preferably a tetrafluoroethylene resin and / or a vinylidene fluoride resin.

  The primary particle size of the fluororesin fine particles is preferably 0.05 to 1 μm, and more preferably 0.1 to 0.5 μm. When the primary particle size is less than 0.05 μm, the particles tend to aggregate at the time of dispersion. On the other hand, when the particle size exceeds 1 μm, image quality defects tend to occur. The primary particle size can be measured by an apparatus such as a BET value measurement or electron microscope observation.

  The charge transport layer 6 preferably contains inorganic particles in addition to the fluororesin fine particles. When the coating liquid for forming the charge transport layer is prepared, the inorganic particles function as a dispersion aid, so that the fluororesin fine particles are more uniformly dispersed in the layer, and the effects of the present invention can be further enhanced.

  Examples of inorganic particles include alumina (aluminum oxide), silica (silicon dioxide), titanium oxide, zinc oxide, cerium oxide, zinc sulfide, magnesium oxide, copper sulfate, sodium carbonate, magnesium sulfate, potassium chloride, calcium chloride, and chloride. Examples include inorganic particles made of sodium, nickel sulfate, antimony, manganese dioxide, chromium oxide, tin oxide, zirconium oxide, barium sulfate, aluminum sulfate, silicon carbide, titanium carbide, boron carbide, tungsten carbide, zirconium carbide and the like. These are preferably used alone or in combination of two or more. Of these, particles made of silica are preferable.

  As the silica particles, those produced by a chemical flame CVD method are preferable. Specifically, a method of obtaining silica fine particles by gas phase reaction of chlorosilane gas in a high-temperature flame of oxygen-hydrogen mixed gas or hydrocarbon-oxygen mixed gas is preferable.

  In addition, as the inorganic particles, particles having a hydrophobic surface are preferable. As the hydrophobizing agent, for example, a siloxane compound, a silane coupling agent, a titanium coupling agent, a polymer fatty acid or a metal salt thereof is used.

  Examples of the siloxane compound include polydimethylsiloxane, dihydroxypolysiloxane, and octamethylcyclotetrasiloxane. Examples of the silane coupling agent include γ- (2-aminoethyl) aminopropyltrimethoxysilane, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane, γ-methacryloxypropyltrimethoxysilane, N- β- (N-vinylbenzylaminoethyl) -γ-aminopropyltrimethoxysilane hydrochloride, hexamethyldisilazane, methyltrimethoxysilane, butyltrimethoxysilane, isobutyltrimethoxysilane, hexyltrimethoxysilane, octyltrimethoxysilane Decyltrimethoxysilane, dodecyltrimethoxysilane, phenyltrimethoxysilane, o-methylphenyltrimethoxysilane, p-methylphenyltrimethoxysilane and the like.

  The primary particle size of the inorganic particles is preferably 0.005 to 2.0 μm, and more preferably 0.01 to 1.0 μm. If the primary particle size of the inorganic particles is less than 0.005 μm, it tends to be difficult to obtain sufficient mechanical strength of the surface of the photoreceptor, and tends to aggregate when dispersed. On the other hand, when the thickness exceeds 2 μm, the surface roughness of the photoreceptor increases, the cleaning blade is worn and damaged, the cleaning characteristics deteriorate, and image blur tends to occur.

  Fluorine-based resin fine particles and inorganic particles can be dispersed by media dispersers such as ball mills, vibrating ball mills, attritors, sand mills, horizontal sand mills, and medialess machines such as stirrers, ultrasonic dispersers, roll mills, and high-pressure homogenizers. A disperser can be used. Furthermore, examples of the high-pressure homogenizer include a collision method in which the dispersion liquid is dispersed by liquid-liquid collision or liquid-wall collision in a high pressure state, and a penetration method in which a fine flow path is dispersed in a high pressure state.

  As an example of the dispersion of the coating liquid for forming the charge transport layer 6 in which the releasable solid particles are dispersed, the fluorine resin fine particles and the inorganic particles are dispersed in the coating liquid composed of a binder resin, a charge transport material and the like dissolved in a solvent The method of doing is mentioned.

  In addition, it is effective to add a small amount of a dispersion aid in order to improve the dispersion stability of each particle in the coating liquid (dispersion) and prevent agglomeration during the formation of the coating film. Examples of the dispersion aid include a fluorine-based surfactant, a fluorine-based polymer, a silicone-based polymer, and a silicone oil. Here, the fluoropolymer is a polymer containing a fluorine atom.

  Among these, a fluorine-based polymer, particularly a fluorine-based graft polymer is effective as a dispersion aid. The fluorine-based graft polymer is preferably a resin graft-polymerized from a macromonomer composed of an acrylic ester compound, a methacrylic ester compound, a styrene compound, or the like and perfluoroalkylethyl methacrylate. The amount of the dispersion aid added is preferably from 0.01 to 5% by weight based on the solid content of the coating solution. By using such a dispersion aid together, the fluororesin fine particles are more uniformly dispersed in the layer, and the effects of the present invention can be obtained more sufficiently while maintaining the electrophotographic characteristics at a high level.

  In addition, additives such as antioxidants, light stabilizers, and heat stabilizers are added to the photosensitive layer for the purpose of preventing deterioration of the photoreceptor due to ozone, oxidizing gas, or light or heat generated in the image forming apparatus. Can be added.

  For example, examples of the antioxidant include hindered phenol, hindered amine, paraphenylenediamine, arylalkane, hydroquinone, spirochroman, spiroidanone and their derivatives, organic sulfur compounds, and organic phosphorus compounds.

  Examples of the antioxidant include 2,6-di-t-butyl-4-methylphenol, styrenated phenol, and n-octadecyl-3- (3 ′, 5′-di-t. -Butyl-4'-hydroxyphenyl) -propionate, 2,2'-methylene-bis (4-methyl-6-t-butylphenol), 2-t-butyl-6- (3'-t-butyl-5 ' -Methyl-2'-hydroxybenzyl) -4-methylphenyl acrylate, 4,4'-butylidene-bis- (3-methyl-6-tert-butyl-phenol), 4,4'-thio-bis (3- Methyl 6-tert-butylphenol), 1,3,5-tris (4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanurate, tetrakis- [methylene-3- (3 ′, 5 -Di-t-butyl-4'-hydroxy-phenyl) propionate] -methane, 3,9-bis [2- [3- (3-t-butyl-4-hydroxy-5-methylphenyl) propionyloxy]- 1,1-dimethylethyl] -2,4,8,10-tetraoxaspiro [5,5] undecane, 3-3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) stearyl propionate, etc. Is mentioned.

  Among hindered amine compounds, bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, 1- [2- [ 3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] ethyl] -4- [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] -2 , 2,6,6-tetramethylpiperidine, 8-benzyl-7,7,9,9-tetramethyl-3-octyl-1,3,8-triazaspiro [4,5] undecane-2,4-dione, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, dimethyl-1- (2-hydroxyethyl) -4-hydroxy-2,2,6,6-tetramethylpiperidine succinate Condensate, poly {[6- (1,1,3,3-tetramethylbutyl) imino-1,3,5-triazine-2,4-diimyl] {(2,2,6,6-tetramethyl- 4-piperidyl) imino} hexamethylene {(2,3,6,6-tetramethyl-4-piperidyl) imino}}, 2- (3,5-di-t-butyl-4-hydroxybenzyl) -2- n-Butylmalonate bis (1,2,2,6,6-pentamethyl-4-piperidyl), N, N′-bis (3-aminopropyl) ethylenediamine-2,4-bis [N-butyl-N— (1,2,2,6,6, -pentamethyl-4piperidyl) amino] -6-chloro-1,3,5-triazine condensate and the like.

  Examples of organic sulfur antioxidants include dilauryl-3,3′-thiodipropionate, dimyristyl-3,3′-thiodipropionate, distearyl-3,3′-thiodipropionate, pentaerythritol-tetrakis. -(Β-lauryl-thiopropionate), ditridecyl-3,3′-thiodipropionate, 2-mercaptobenzimidazole and the like.

  Examples of the organophosphorus antioxidant include trisnonylphenyl phosfte, triphenyl phosfte, tris (2,4-di-t-butylphenyl) -phosfte, and the like.

  Organic sulfur-based and organic phosphorus-based antioxidants are referred to as secondary antioxidants, and a synergistic effect can be obtained by using them together with primary antioxidants such as phenols or amines.

  Examples of the light stabilizer include benzophenone-based, benzotriazole-based, dithiocarbamate-based, and tetramethylpiperidine-based derivatives.

  Examples of the benzophenone light stabilizer include 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2,2'-di-hydroxy-4-methoxybenzophenone, and the like.

  Examples of the benzotriazole-based light stabilizer include 2- (2′-hydroxy-5′-methylphenyl) -benzotriazole, 2- [2′-hydroxy-3 ′-(3 ″, 4 ″, 5 ′). ', 6' '-tetra-hydrophthalimido-methyl) -5'-methylphenyl] -benzotriazole, 2- (2'-hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzo Triazole, 2- (2′-hydroxy-3′-t-butyl-5′-methylphenyl-)-5-chlorobenzotriazole, 2- (2′-hydroxy-3 ′, 5′-t-butylphenyl) -Benzotriazole, 2- (2'-hydroxy-5'-t-octylphenyl) -benzotriazole, 2- (2'-hydroxy-3 ', 5'-di-t-amylphenyl) -ben Triazole, and the like. Other compounds include 2,4, di-t-butylphenyl-3 ', 5'-di-t-butyl-4'-hydroxybenzoate, nickel dibutyl-dithiocarbamate, and the like.

Further, at least one kind of electron accepting substance can be included for the purpose of improving sensitivity, reducing residual potential, reducing fatigue during repeated use, and the like. Examples of the electron-accepting substance that can be used for the photoreceptor 1 include succinic anhydride, maleic anhydride, dibromomaleic anhydride, phthalic anhydride, tetrabromophthalic anhydride, tetracyanoethylene, tetracyanoquinodimethane, o-di Examples thereof include nitrobenzene, m-dinitrobenzene, chloranil, dinitroanthraquinone, trinitrofluorenone, picric acid, o-nitrobenzoic acid, p-nitrobenzoic acid, and phthalic acid. Of these, fluorenone-based, quinone-based, and benzene derivatives having electron-withdrawing substituents such as Cl, CN, NO ₂ are particularly preferable.

  The above-described coating solution for forming a charge transport layer is applied onto the charge generation layer by dip coating, ring coating, spray coating, bead coating, blade coating, roller, depending on the shape and application of the photoreceptor. It can carry out using coating methods, such as a coating method, a knife coating method, and a curtain coating method. Drying is preferably performed by heating after touch drying at room temperature. The heat drying is desirably performed at a temperature of 30 to 200 ° C. for a time in the range of 5 minutes to 2 hours.

  The film thickness of the charge transport layer 6 is preferably 5 to 50 μm, more preferably 10 to 30 μm.

  Further, the content of the fluororesin fine particles in the charge transport layer 6 is preferably 3 to 40% by weight, and more preferably 4 to 30% by weight, based on the total solid content of the charge transport layer 6. If the content is less than 3% by weight, the modification effect due to the dispersion of the fluororesin fine particles tends to be insufficient. On the other hand, if it exceeds 40% by weight, the light transmission property tends to decrease and the residual potential tends to increase due to repeated use, and it tends to be difficult to form a layer.

  Further, the content of the inorganic particles in the charge transport layer 6 is preferably 0.1 to 30% by weight, more preferably 1 to 20% by weight, based on the total solid content of the charge transport layer 6. If the content is less than 0.1% by weight, the modification effect due to the dispersion of inorganic particles tends to be insufficient. On the other hand, if it exceeds 30% by weight, the residual potential tends to increase due to repeated use.

  As shown in FIG. 4, the photoreceptor 1 may include a single-layer type photosensitive layer 8. This single-layer type photosensitive layer includes the charge generation material and the charge transport material described above.

  The single-layer type photosensitive layer 8 can be formed by a known method. For example, a charge generation material, a charge transport material, and a binder resin are dissolved in a solvent to prepare a single-layer type photosensitive layer forming coating solution, which is applied on the lower layer (undercoat layer 4 in FIG. 4). And can be formed by drying. The film thickness of the single-layer type photosensitive layer 8 is set within a normal range.

  As shown in FIGS. 3 and 4, the photoreceptor 1 may be provided with a protective layer 7. The protective layer 7 is configured using a commonly used material. When the protective layer 7 is provided on the side of the photoreceptor 1 furthest from the conductive support 2 as shown in FIGS. 3 and 4, the protective layer 7 includes the specific arylate resin described above. And an arylate resin-containing layer.

  Further, the protective layer 7 improves the wear resistance of the photoconductor to improve the life of the photoconductor, improves the matching with the developer, and the chemicals of the charge transport layer 6 when the electrophotographic photoconductor is charged. It becomes possible to prevent changes.

  Examples of the protective layer 7 include an insulating resin layer, a charge transporting protective layer made of a polymer compound imparted with charge transporting properties, or a resistance control type surface protective layer in which a resistance control agent such as a metal oxide is dispersed. Can be mentioned.

  The photosensitive member constituted as described above is an image forming apparatus such as the image forming apparatus 100, a light lens type copying machine, a laser beam printer that emits near infrared light or visible light, a digital copying machine, an LED printer, and a laser facsimile. It can also be used. The photoreceptor can be used in combination with a one-component or two-component developer. In addition, this photoreceptor can provide good characteristics with less current leakage even in a contact charging method using a charging roller or a charging brush.

  The coated paper used in the present embodiment is a coated paper including a base material, an adhesive containing a latex having a glass transition temperature of 20 ° C. or higher, and a pigment disposed on at least one surface of the base material. And the glossiness of the surface of the coating layer opposite to the substrate is 10% or more.

  First, the base material will be described. As for a base material, the base paper comprised from a pulp and the sheet | seat comprised from resin are mentioned. In addition, what is generally used in order to produce an OHP sheet etc. can be used for the said resin.

  As the pulp used for the base paper, the pulp used for the base paper of ordinary ordinary coated paper can be used. Examples thereof include sulfite pulp, kraft pulp, semi-chemical pulp, chemiground pulp, groundwood pulp, refiner ground pulp, and thermomechanical pulp. In addition, waste paper pulp obtained from newspaper waste paper, magazine waste paper, high-quality waste paper, and the like can also be used. These can be used individually by 1 type or in combination of 2 or more types.

  It is preferable to use a filler for the base paper in order to improve the coating suitability and to adjust the opacity and whiteness after coating. Examples of fillers that can be used here include heavy fillers such as heavy calcium carbonate, light calcium carbonate, kaolin, calcined clay, pyroferrite, sericite, and talc, and inorganic fillers such as titanium dioxide, urea resin, and styrene. And organic pigments such as resin. The blending amount of these fillers is preferably 3 to 20% by weight, more preferably 5 to 15% by weight, based on the total amount of the base paper.

  Furthermore, various chemicals such as a sizing agent used for the base paper can be used by internal or external addition. Examples of the sizing agent include sizing agents such as rosin sizing agents, synthetic sizing agents, petroleum resin sizing agents, and neutral sizing agents. An appropriate sizing agent such as a sulfuric acid band or cationized starch may be used in combination with a fiber fixing agent. From the viewpoint of paper storage stability after copying in electrophotographic copying machines, printers, etc., neutral sizing agents such as alkenyl succinic anhydride sizing agents, alkyl ketene dimers, alkenyl ketene dimers, neutral rosins, petroleum sizes, Olefin resins and styrene-acrylic resins are preferred.

  Furthermore, for the purpose of adjusting the surface electrical resistance value of the base paper, inorganic substances such as sodium chloride, potassium chloride, calcium chloride, sodium sulfate, zinc oxide, titanium dioxide, tin oxide, aluminum oxide, magnesium oxide, and alkylphosphoric acid are used. Organic materials such as ester acids, alkylsulfuric acid esters, sulfonic acid sodium salts, and quaternary ammonium salts can be used alone or in combination. In addition to these, various auxiliary agents blended in ordinary coated paper base paper, such as a paper strength enhancer, a dye, and a pH adjuster, can be appropriately used.

  Next, the coating layer will be described. The coating layer contains a pigment and an adhesive.

  The pigment is a pigment used for general coated paper, for example, heavy calcium carbonate, light calcium carbonate, titanium dioxide, aluminum hydroxide, satin white, talc, calcium sulfate, barium sulfate, zinc oxide, magnesium oxide, magnesium carbonate , Amorphous silica, colloidal silica, white carbon, kaolin clay, calcined kaolin, delaminated clay, aluminosilicate, sericite, bentonite, smectite and other mineral pigments, styrene resins such as polystyrene and polymethylstyrene , Solid or hollow organic pigments mainly composed of acrylic resins such as polymethyl methacrylate, polymethyl acrylate, polyacrylonitrile, styrene-acrylic resins, urea formaldehyde resins, polyvinyl chloride, polycarbonate, etc. Is It is. These can be used individually by 1 type or in combination of 2 or more types. From the viewpoint of glossiness, it is preferable to contain kaolin clay and / or talc having a plate-like crystal shape.

  The adhesive contains a latex having a glass transition temperature of 20 ° C. or higher. This glass transition temperature is preferably 30 to 80 ° C. When the glass transition temperature is less than 20 ° C., the strength of the coating layer is lowered, and an adhesive is easily generated as paper powder together with a pigment such as kaolin clay. In addition, the adhesive in the generated paper powder tends to be sticky, and adheres to the photoconductor, which tends to cause image quality defects such as missing images. When the glass transition temperature exceeds 80 ° C., the adhesiveness of the coating layer tends to be inferior when the coated paper is dried, and the strength of the coating layer tends to be reduced and the amount of paper dust generated tends to increase.

  Latex may have a glass transition temperature of 20 ° C. or higher, and styrene-butadiene, styrene-acrylic, ethylene-vinyl acetate, butadiene-methyl methacrylate, vinyl acetate-butyl acrylate, acrylic acid-methyl methacrylate, Synthetic latex made of a copolymer such as vinyl alcohol-maleic anhydride can be used. Among these, styrene-butadiene latex or acrylonitrile-butadiene latex is preferable.

  Such a latex having a glass transition temperature of 20 ° C. or higher is preferably contained in an amount of 40% by weight or more based on the total adhesive contained in the coating layer. If it is less than 40% by weight, the influence of the adhesive component appears, which is not preferable from the viewpoint of paper dust generation and paper dust adhesion to the photoreceptor. The content of latex having a glass transition temperature of 20 ° C. or higher is more preferably 40 to 100% by weight.

  In addition, the adhesive contains commonly known adhesives such as oxidized starch, esterified starch, enzyme-modified starch and cold-water soluble starch obtained by flash drying them, casein, soy protein and other natural adhesives. You can also

  Each of the above-mentioned adhesives is preferably used in an amount of 5 to 50 parts by weight, more preferably 10 to 30 parts by weight with respect to 100 parts by weight of the pigment. Moreover, you may use suitably various adjuvants mix | blended with normal pigments for coated paper, such as a dispersing agent, a thickener, a water retention agent, an antifoamer, and a water resistance agent, as needed.

The coated paper is usually produced by applying a pigment having an average particle size of 1 micron or less at 10 g / m ² or more per one side of the base paper using various coaters and then smoothing the surface by calendering.

When manufacturing a coated paper, first, each said component is mix | blended and a coating composition is prepared. Next, the coating composition is applied to a coating apparatus used in general coated paper production, for example, a blade coater, an air knife coater, a roll coater, a reverse roll coater, a bar coater, a curtain coater, a die slot coater, or a gravure coater. by on-machine or off-machine, preferably a per side by dry weight divided into more or multiple layers on the substrate 8~50g / ^{m 2,} more preferably coated in the range of 10 to 25 g / ^{m 2.}

  The smoothing process after the coating is performed using a smoothing apparatus that is usually used, for example, a super calendar, a machine calendar, a soft nip calendar, or the like. The coated paper is then finished so that the glossiness is 10% or more, more preferably 50% or more, and even more preferably 60% or more. When the glossiness is 10% or more, sufficient image quality sharpness can be obtained when forming an image.

The density of the coated layer of the coated paper thus obtained is preferably adjusted to 1.20 g / m ³ or less, more preferably 1.10 g / m ³ or less.

  In order to reduce blisters generated in the fixing step, the coated paper is preferably finished so that the Oken type air permeability is 8000 seconds or less. For this purpose, for example, selection of pigments with good orientation after calendaring (organic pigments, delaminated clays, columnar pigments, etc.), lamination of coating layers, raising the roll temperature of the finishing calendar, etc. These are used in appropriate combinations according to the purpose. In the above-described lamination of the coating layer, the coating of the lower layer is intended to seal the base paper, whereby the upper surface coating layer improves the smoothness and facilitates high white paper gloss.

The basis weight of the coated paper thus obtained is preferably in the range of 70 to 280 g / m ² . If the basis weight is less than 70 g / m ² , the amount of heat applied to the paper at the time of fixing increases, the water vapor pressure becomes too high, and blisters tend to be generated particularly at high humidity. On the other hand, if it exceeds 280 g / m ² , the amount of heat with respect to the paper tends to be small, and the amount of heat required for fixing the toner onto the paper tends to be insufficient.

  Furthermore, the moisture content in the paper immediately after opening is preferably in the range of 3.0 to 6.5%. If the water content immediately after opening is less than 3.0%, the water vapor pressure inside the paper will be small. However, if left unopened, it will absorb moisture up to equilibrium moisture in a short time due to its high hygroscopicity. Tend to. On the other hand, if it exceeds 6.5%, the water vapor pressure increases, the degree of blistering increases, and the occurrence of blocking during coating of the coating layer during production, curling after dusting during copying or copying, etc. There is a tendency to be unable to deter.

  The coated paper is adjusted by a paper machine, a coater dryer and a calendar process so that the moisture immediately after opening is preferably 3.0 to 6.5%, more preferably 4.5 to 5.5%. To do. Moreover, it is packed with moisture-proof wrapping paper such as polyethylene laminated paper or polypropylene so that moisture absorption and desorption does not occur during storage.

  These coated papers are usually used in the field of commercial printing, but instead of ordinary PPC paper and printer paper, these coated papers can be applied to electrophotographic copying machines and printers. It becomes possible to increase the sharpness of the image.

  As described above, when image formation is performed by applying the specific photoconductor and the specific coated paper to the image forming apparatus 100, the occurrence of paper dust on the coated paper and the occurrence of the paper dust. Adhesion to the surface of the electrophotographic photosensitive member can be sufficiently prevented, and an image with high image quality definition can be stably obtained. Further, such image formation can be particularly preferably used when obtaining a color image.

  FIG. 5 is a schematic diagram showing another preferred embodiment of the image forming apparatus of the present invention. An image forming apparatus 200 shown in FIG. 5 is an image forming apparatus that does not include an intermediate transfer member. Similar to the image forming apparatus shown in FIG. 1, four drum-shaped electrophotographic photoreceptors 2a to 2d (for example, 2a) are used. 2b is magenta, 2c is cyan, and 2d is black, respectively) can be formed in parallel with each other along the paper transport belt 206.

  Here, each of the electrophotographic photoreceptors 2a to 2d mounted on the image forming apparatus 200 includes the above-described electrophotographic photoreceptor 1.

  Each of the electrophotographic photoreceptors 2a to 2d can be rotated in a predetermined direction (clockwise on the paper surface) at a predetermined peripheral speed (process speed), and the charging devices 202a to 202d and the exposure device 203a along the rotation direction. To 203d, developing devices 204a to 204d, transfer devices 211a to 211d, and cleaning devices 205a to 205d are arranged.

  As the exposure devices 203a to 203d, the developing devices 204a to 204d, the transfer devices 211a to 211d, and the cleaning devices 205a to 205d, those usually used can be used. In the image forming apparatus 200, scorotron chargers are used as the charging devices 202a to 202d. Each of the developing devices 204a to 204d can be supplied with toner of four colors, yellow (Y), magenta (M), cyan (C), and black (K) accommodated in a toner cartridge (not shown). Further, the transfer devices 211a to 211d are in contact with the electrophotographic photoreceptors 2a to 2d via the paper transport belt 206, respectively.

  The developing devices 204a to 204d are arranged in the order of Y, M, C, and K toner colors in FIG. 5, but this is in accordance with the image forming method of the system such as M, Y, C, and K, for example. And an appropriate order can be set.

  Accordingly, in the same manner as the image forming apparatus 100 in FIG. 1, the charging, exposure, development, transfer, and cleaning processes are sequentially performed in the rotation process of the electrophotographic photoreceptors 2a to 2d.

  The sheet conveying belt 206 is supported by rolls 207, 208, 209, and 210 with a predetermined tension, and can rotate at the same peripheral speed as the electrophotographic photoreceptors 2a to 2d without causing deflection due to the rotation of these rolls. It has become.

  A tray 213 is provided at a predetermined position in the image forming apparatus 200, and the coated paper as the transfer medium 212 is provided in the tray 213. The transfer medium 212 is sequentially transferred between the electrophotographic photoreceptors 2a to 2d and the transfer devices 211a to 211d, and further to the fixing device 215 in which two rolls are in contact with each other. Paper is discharged to the outside. Thus, the toner images formed on the electrophotographic photoreceptors 2a to 2d are sequentially transferred onto the transfer medium 112 to form an image (monochrome image or color image), and the image is fixed.

  In such an image forming apparatus 200, toner images of different colors are superimposed and transferred onto the transfer medium 212 to form a color toner image. The color toner image is fixed on the transfer medium 212 by the fixing device 215 to become a color image.

  EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example and a comparative example, this invention is not limited to a following example at all. In the following examples, “parts” means parts by weight.

(Photoreceptor 1)
First, a mirror surface aluminum pipe (JIS-H4080 A1050) having a diameter of 84 mmφ × 340 mm was prepared, and a wet honing treatment (a method described in JP-A-2-87154) of an aluminum pipe was performed. That is, using a liquid honing device, 10 kg of abrasive (Green Desic GC # 400, Showa Denko) was suspended in 40 liters of water, and it was pumped to the gun at a flow rate of 6 liters / minute. The aluminum pipe was moved in the axial direction while rotating at 120 rpm at a spraying speed of 60 mm / min and an air pressure of 0.85 kgf / cm ² , and wet honing treatment was performed to obtain a conductive support. Center line average roughness R _a of the conductive support was 0.17 .mu.m.

  170 parts of n-butyl alcohol in which 4 parts of polyvinyl butyral resin (ESREC BM-S, manufactured by Sekisui Chemical Co., Ltd.) was dissolved, 30 parts of an organic zirconium compound (acetylacetone zirconium butyrate) and a mixture of organic silane compounds (γ-aminopropyltri 3 parts of ethoxysilane were mixed to obtain a coating solution for forming an undercoat layer. This undercoat layer forming coating solution was applied onto the above-mentioned conductive support and air-dried at room temperature for 5 minutes. Thereafter, the conductive support was heated at 50 ° C. for 7 minutes, placed in a constant temperature and humidity chamber of 85% RH (dew point 47 ° C.) at 50 ° C., and subjected to humidification hardening acceleration treatment for 10 minutes. Next, the drying process was performed for 10 minutes at 135 degreeC with the hot air dryer. As described above, an undercoat layer was formed on the conductive support.

  Next, strong diffraction at 7.4 °, 16.6 °, 25.5 ° and 28.3 ° at the Bragg angle (2θ ± 0.2 °) of the X-ray diffraction spectrum using CuKα rays as the charge generation material. A mixture of 15 parts of gallium chloride phthalocyanine having a peak, 10 parts of vinyl chloride-vinyl acetate copolymer resin (VMCH, manufactured by Nihon Unicar Co., Ltd.) as a binder resin, and 300 parts of n-butyl alcohol was mixed in a sand mill for 4 hours. Distributed. The obtained dispersion was used as a charge generation layer coating solution, which was dip coated on the undercoat layer and dried to form a charge generation layer having a thickness of 0.2 μm.

  Next, 20 parts of N, N′-bis (3-methylphenyl) -N, N′-diphenylbenzidine, 20 parts of N, N′-bis (3,4-dimethylphenyl) biphenyl-4-amine, and the above 60 parts of an arylate resin (viscosity average molecular weight 40,000) having a repeating unit represented by the formula (I-2) was sufficiently dissolved and mixed in 280 parts of tetrohydrofuran and 120 parts of toluene. The arylate resin includes a repeating unit in which the rightmost carbonyl carbon is bonded to the p-position of the benzene ring among the repeating units represented by the formula (I-2), and a repeating unit represented by the formula (I-2). Among them, a copolymer having a repeating unit in which the carbonyl carbon on the right end is bonded to the m-position of the benzene ring in a ratio of 1: 1. The resulting solution was used as a charge transport layer forming coating solution, and the coating solution was dip coated on the charge generation layer and dried to form a 28 μm thick charge transport layer. The obtained photoreceptor was designated as photoreceptor 1.

(Photoreceptor 2)
The formation of the charge generation layer was performed in the same manner as in the photoreceptor 1. Next, 20 parts of N, N′-bis (3-methylphenyl) -N, N′-diphenylbenzidine, 20 parts of N, N′-bis (3,4-dimethylphenyl) biphenyl-4-amine, and bisphenol A coating solution for forming a charge transport layer was prepared by sufficiently dissolving and mixing 60 parts of Z polycarbonate resin (viscosity average molecular weight 40,000) in 280 parts of tetrohydrofuran and 120 parts of toluene. Using the coating solution, a charge transport layer was formed in the same manner as in the photoreceptor 1 to prepare a photoreceptor 2.

(Coated paper 1)
To a pulp slurry of 80 parts of LBKP (freeness (CSF) = 320 ml) and 20 parts of NBKP (freeness (CSF) = 440 ml), light calcium carbonate (Okutama Kogyo Co., Ltd., TP-121) is 10% by weight. In addition, 2 parts of starch per pulp, 1.5 parts of rosin sizing agent, and 2 parts of sulfuric acid band were added, and paper was made using a long net paper machine. Next, oxidized starch (Oji Corn Starch Co., Ltd., Ace A) was applied to the wet paper with a size press so that the coating amount was 2.0 g / m ² in terms of dry weight and dried. Thereafter, smoothing treatment was performed by a machine calendar so that the Oken smoothness was 40 seconds, and a base paper having a basis weight of 75 g / m ² was obtained.

  Next, 25 parts of light calcium carbonate (Okutama Kogyo Co., Ltd., TP-123) and 75 parts of Kaolin clay (Engelhard Co., Ltd., Ultra White 90) were blended as pigment components. Acrylonitrile-butadiene latex (Nihon Zeon Co., Ltd., Nipol) having 3 parts of oxidized starch (Oji Corn Starch Co., Ltd., Oji Ace B) as an adhesive and a glass transition temperature of 26 degrees with respect to 100 parts of the pigment component. 1577) and 0.3 part of a dispersant (Toa Gosei Co., Ltd., Aron T-40) were blended to prepare a coating composition.

This coating composition was coated on both sides with a blade coater so as to be 15 g / m ^{2 on} one side of the above base paper. Then, smoothing is performed so that the glossiness of white paper (75 ° specular glossiness specified in JIS P8142; the same applies hereinafter) is 69% and the moisture in the paper is 4.8% with a super calendar at a roll temperature of 50 ° C. The coated paper 1 having a basis weight of 105 g / m ² was obtained. The obtained coated paper 1 was stored in a moisture-proof bag to prevent moisture absorption and subjected to quality evaluation. Similarly, in the production of the following coated paper, the coated paper was stored in a moisture-proof bag after the coated paper was produced.

(Print test 1)
Using the obtained photoreceptors 1 and 2 and coated paper 1, the following print test 1 was performed.

First, the photoconductors 1 and 2 are mounted on a color document tech 60 (manufactured by Fuji Xerox Co., Ltd.) (having the same configuration as that of the image forming apparatus shown in FIG. 1). A device was prepared. Here, in Example 1, image formation was performed using the photoconductor 1, and in Comparative Example 1, image formation was performed using the photoconductor 2. A scorotron charger was used as the charger of the image forming apparatus. A seamless belt having a volume resistance of 10 ¹⁰ Ωcm was used as the intermediate transfer member. The seamless belt was prepared by centrifugal molding based on a molding liquid in which resistance was adjusted by dispersing carbon particles in polyimide.

Print test 1 was performed at a process speed of 264 mm / sec. Before the print test 1, after adjusting the conditions of the charger so that the dark portion potential (V _H ) is −650 V, the exposure amount is adjusted so that the exposed portion potential (V _L ) is −300 V. .

  In print test 1, the image forming apparatus was allowed to stand overnight at 30 ° C. and 85% high temperature and high humidity so that the peeled material from the coated paper would adhere to the photoconductor and cause image quality deterioration. Below, 10,000 color images were printed per day. Subsequently, it was left in the same environment all night, and the printing of 10,000 sheets was continued the next day, and a total of 30,000 color images were printed.

  Then, the charging potential of the photosensitive member and the image were evaluated at the beginning of the test and after printing 30,000 sheets. The images were evaluated based on the following criteria: A: good and no problem, B: some image omission was observed, and C: image omission occurred on the entire surface. The results obtained are shown in Table 12.

(Coated paper 2)
A base paper was obtained in the same manner as coated paper 1. Next, 80 parts of light calcium carbonate (Okutama Kogyo Co., Ltd., TP-123) and 20 parts of Kaolin clay (Engelhard Co., Ltd., Ultra White 90) were blended as pigment components. For 100 parts of the pigment component, 3 parts of oxidized starch (Oji Corn Starch Co., Ltd., Oji Ace B) as an adhesive, and an acrylonitrile-butadiene latex (Nippon Zeon Co., Ltd.) having a glass transition temperature of 26 degrees. A coating composition was prepared by blending 12 parts of Nipol 1577) and 0.3 part of a dispersant (Toa Gosei Co., Ltd., Aron T-40).

This coating composition was coated on both sides with a blade coater so as to be 15 g / m ^{2 on} one side of the base paper. Thereafter, 15% sheet gloss at a roll temperature 0.99 ° C. soft nip calender, performs smoothing processing as in paper moisture is 4.9%, to obtain a coated paper 2 having a basis weight of 105 g / m ² .

(Coated paper 3)
70 parts of LBKP (freeness (CSF) = 310 ml) and 30 parts of NBKP (freeness (CSF) = 440 ml) are added to a light slurry of light calcium carbonate (Okutama Kogyo Co., Ltd., TP-121) at 10% by weight. 0.2 parts of alkenyl succinic anhydride, 0.5 parts of cationized starch and 0.8 parts of polyacrylamide resin (Harima Kasei Co., Ltd., Hermide EX360) The paper was made using a long net paper machine.

Next, oxidized starch (Oji Cornstarch Co., Ltd., Ace A) was applied to the wet paper with a size press so that the coating amount was 2.0 g / m ² in terms of dry weight and dried. Thereafter, a smoothing process was performed by a machine calendar so that the Oken smoothness was 30 seconds, and a base paper having a basis weight of 75 g / m ² was obtained.

  Next, 40 parts of light calcium carbonate (Okutama Kogyo Co., Ltd., TP-123) and 60 parts of kaolin (Engelhard Co., Ltd., Ultra White 90) were blended as pigment components. For 100 parts of this pigment component, as an adhesive, 3 parts of oxidized starch (Oji Corn Starch Co., Ltd., Oji Ace B) and an acrylonitrile-butadiene latex (Nippon Zeon Co., Ltd.) having a glass transition temperature of 26 degrees are used. A coating composition containing 12 parts of Nipol 1577) and 0.3 part of a dispersant (Toa Gosei Co., Ltd., Aron T-40) was prepared.

The coating composition was coated on both sides with a blade coater so that the coating composition had a single side of 15 g / m ² . Thereafter, a smoothing process was performed with a super calendar at a roll temperature of 50 ° C. so that the glossiness of the white paper was 43% and the moisture in the paper was 5.0%, whereby a coated paper 3 having a basis weight of 105 g / m ² was obtained.

(Coated paper 4)
To a pulp slurry of 40 parts of LBKP (freeness (CSF) = 350 ml) and 60 parts of NBKP (freeness (CSF) = 440 ml), light calcium carbonate (Okutama Kogyo Co., Ltd., TP-121) is 10% by weight. Then, 2 parts of starch, 1.5 parts of rosin sizing agent and 2 parts of sulfuric acid band were added per pulp, and paper was made using a long paper machine.

Next, oxidized starch (Oji Cornstarch Co., Ltd., Ace A) was applied to the wet paper with a size press so that the coating amount was 2.0 g / m ² in terms of dry weight and dried. Thereafter, a smoothing process was performed by a machine calendar so that the Oken smoothness was 30 seconds, and a base paper having a basis weight of 75 g / m ² was obtained.

Next, 30 parts of light calcium carbonate (Okutama Kogyo Co., Ltd., TP-123) and 70 parts of kaolin (Engelhard Co., Ltd., Ultra White 90) were blended as pigment components. Styrene-butadiene latex (JSR Corporation, 0602) having 3 parts of oxidized starch (Oji Corn Starch Co., Ltd., Oji Ace B) and glass transition temperature of 40 ° C. as an adhesive with respect to 100 parts of the pigment component. ) And 14 parts of a dispersant (Toa Gosei Co., Ltd., Aron T-40) were blended to prepare a coating composition. The coating composition was coated on both sides with a blade coater so that the coating composition had a single side of 15 g / m ² . Thereafter, a smoothing process was performed with a super calendar at a roll temperature of 60 ° C. so that the glossiness of the blank paper was 60% and the moisture in the paper was 4.7%, whereby a coated paper 4 having a basis weight of 105 g / m ² was obtained.

(Coated paper 5)
Light calcium carbonate (Okutama Kogyo Co., Ltd., TP-121) is 10% by weight in a pulp slurry of 60 parts of LBKP (freeness (CSF) = 310 ml) and 40 parts of NBKP (freeness (CSF) = 440 ml). And 2 parts of starch, 1.5 parts of rosin sizing agent and 2 parts of sulfuric acid band were added per pulp, and paper was made using a long net paper machine.

Next, oxidized starch (Oji Cornstarch Co., Ltd., Ace A) was applied to the wet paper with a size press so that the coating amount was 2.0 g / m ² in terms of dry weight and dried. Thereafter, a smoothing process was performed with a machine calendar so that the Oken smoothness was 40 seconds to obtain a base paper having a basis weight of 75 g / m ² .

Next, 80 parts of light calcium carbonate (Okutama Kogyo Co., Ltd., TP-222H) and 20 parts of Korean talc were blended as pigment components. To 100 parts of the pigment component, 8 parts of oxidized starch (Oji Cornstarch Co., Ltd., Oji Ace B) as an adhesive, and acrylonitrile-butadiene latex (Nihon Zeon Co., Ltd., Nipol) having a glass transition temperature of 26 degrees. 1577) and 0.5 part of a dispersant (Toa Gosei Co., Ltd., Aron T-40) were blended to prepare a coating composition. The coating composition was coated on both sides with a blade coater so that the coating composition was 5 g / m ² on one side.

Further, 20 parts of light calcium carbonate (Okutama Kogyo Co., Ltd., TP-222H) and 80 parts of kaolin (Engelhard Co., Ultra White 90) were blended as pigment components. To 100 parts of the pigment component, 6 parts of oxidized starch (Oji Corn Starch Co., Ltd., Oji Ace B) as an adhesive, and acrylonitrile-butadiene latex having a glass transition temperature of 26 degrees (Nippon Zeon Co., Ltd., Nipol) 1577) and 0.3 part of a dispersant (Toa Gosei Co., Ltd., Aron T-40) were blended to prepare a coating composition. The above double-coated base paper was further coated on both sides with a blade coater so as to have a single side of 10 g / m ² . Thereafter, smoothing was performed with a super calendar so that the glossiness of the blank paper was 63% and the moisture in the paper was 5.0%, and an electrophotographic transfer paper of the coated paper 5 having a basis weight of 105 g / m ² was obtained. .

(Coated paper 6)
Coating in the production of the paper 6, except that the base paper having a basis weight of 75 g / m ² based on paper having a basis weight of 98 g / m ² in the same manner as coated paper 1, basis weight of 128 g / m ² Coated paper 6 was obtained.

(Coated paper 7)
Coating in the production of the paper 7, except that the base paper having a basis weight of 75 g / m ² based on paper having a basis weight of 127 g / m ² in the same manner as coated paper 1, basis weight of 157 g / m ² Coated paper 7 was obtained.

(Print test 2)
Test 2 was carried out in the same manner as Test 1 using a photoconductor similar to Photoconductors 1 and 2 (referred to as Photoconductors 1 and 2 as in Print Test 1) and coated papers 2-7.

  First, the photoreceptors 1 and 2 were mounted on a color document tech 60 manufactured by Fuji Xerox Co., and coated papers 2 to 7 were used as printing papers to prepare an image forming apparatus. Here, in Example 2, image formation was performed using the photoreceptor 1, and in Comparative Example 2, image formation was performed using the photoreceptor 2. In both Example 2 and Comparative Example 2, coated paper 2 was used as the printing paper. In Examples 3 to 7 and Comparative Examples 3 to 7, image formation was performed using each photoconductor and coated paper as shown in Table 13. The obtained results are shown in Table 13. Table 13 shows the glossiness of each coated paper.

(Photoconductors 3 to 11)
In the production of the photoconductors 3 to 10, first, the formation of the charge generation layer was performed in the same manner as the photoconductor 1. Next, photoconductors 3 to 10 were prepared in the same manner as photoconductor 1 using a coating liquid for forming a charge transport layer described below. That is, 20 parts of N, N′-bis (3-methylphenyl) -N, N′-diphenylbenzidine, 20 parts of N, N′-bis (3,4-dimethylphenyl) biphenyl-4-amine, and the following table 60 parts of an allylate resin (viscosity average molecular weight 40,000) having a repeating unit of the combination shown in Table 14 in a copolymerization ratio shown in the same table was sufficiently dissolved and mixed in 280 parts of Tetrohydrofuran and 120 parts of toluene. Further, 2.5 parts of tetrafluoroethylene resin particles were added and mixed, and then dispersed with a sand grinder using glass beads to obtain a coating solution for forming a charge transport layer.

  In the arylate resin, each repeating unit (for example, each of (I-1), (III-1), and (IV-1) in the photoreceptor 3) has the carbonyl carbon at the right end at the p-position of the benzene ring. The unit has a repeating unit bonded and a repeating unit in which the rightmost carbonyl carbon is bonded to the m-position of the benzene ring in a ratio of 1: 1. In addition, the arylate resin in the photoreceptors 9 and 10 includes a repeating unit in which the carbonyl carbon at the right end of the repeating units (I-10) and (I-19) is bonded to the p-position of the benzene ring, and the carbonyl carbon at the right end is a benzene ring. And a repeating unit bonded to the m-position in a ratio of 1: 1.

(Photoreceptor 11)
In the production of the photoreceptor 11, first, the formation of the charge generation layer was performed in the same manner as in the photoreceptor 3. Next, instead of the arylate resin in the coating solution for forming the charge transport layer of the photoreceptor 3, a carbonate resin having a repeating unit represented by the following formula (IX), a repeating unit represented by the above formula (I-2), and Except for using a mixture with an allylate resin (viscosity average molecular weight 40,000) having a repeating unit represented by the above formula (III-1) at a copolymerization ratio of 0.9: 0.1, the same as in the photoreceptor 3 Thus, a coating solution for forming a charge transport layer was prepared. Next, using the coating solution, a charge transport layer was formed in the same manner as the photoconductor 3 to prepare a photoconductor 11. In addition, the mixing ratio of carbonate resin and arylate resin was 2: 8. The repeating unit represented by the above formula (I-2) and the repeating unit represented by the above formula (III-1) include a repeating unit in which the rightmost carbonyl carbon is bonded to the p-position of the benzene ring, and the rightmost carbonyl carbon. Has a repeating unit bonded at the m-position of the benzene ring in a ratio of 1: 1.

(Photoreceptor 12)
In the production of the photoreceptor 12, first, the formation of the charge generation layer was performed in the same manner as in the photoreceptor 1. Next, a photoconductor 12 was produced in the same manner as the photoconductor 1 using a coating liquid for forming a charge transport layer described below. That is, 34 parts of N, N′-bis (3-methylphenyl) -N, N′-diphenylbenzidine, 51 parts of the same arylate resin (viscosity average molecular weight 40,000) used in the production of the photoreceptor 1 Was sufficiently dissolved and mixed in 280 parts of tetrohydrofuran and 120 parts of toluene. Furthermore, 8.6 parts of washed tetrafluoroethylene resin particles (L-2 manufactured by Daikin Industries, Ltd.), 0.2 parts of silicon oxide fine particles (hydrophobic silica Aerosil R104), and fluorine-based graft polymer (GF300 manufactured by Toagosei Co., Ltd.) ) 0.2 part was added and mixed, and dispersed with a sand grinder using glass beads. The obtained dispersion was used as a coating liquid for forming a charge transport layer.

(Print test 3)
Test 3 was performed in the same manner as Test 1 using the photoreceptors 1 to 12 and the same coated paper as the coated paper 1 (referred to as the coated paper 1 as in the print test 1). The results obtained are shown in Table 15.

1 is a schematic diagram showing a preferred embodiment of an image forming apparatus of the present invention. It is a schematic cross-sectional view showing a preferred example of an electrophotographic photosensitive member. It is a schematic cross-sectional view showing a preferred example of an electrophotographic photosensitive member. It is a schematic cross-sectional view showing a preferred example of an electrophotographic photosensitive member. It is a schematic diagram which shows other suitable embodiment of the image forming apparatus of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1a-1d, 2a-2d ... Electrophotographic photosensitive member, 2 ... Conductive support body, 3 ... Photosensitive layer, 108 ... Intermediate transfer body, 112, 212 ... Transfer medium, 103a-103d ... Charging apparatus, 102a- 102d ... developing device, 104a-104d ... transfer device, 202a-202d ... charging device, 203a-203d ... exposure device, 204a-204d ... developing device, 211a-211d ... transfer device.

Claims (10)

Comprising a conductive support and a photosensitive layer disposed on the conductive support, and on the side of the photosensitive layer farthest from the conductive support, the following general formula (I), (II), (III) or An electrophotographic photoreceptor preparation step of preparing an electrophotographic photoreceptor provided with an arylate resin-containing layer containing a polymer having one or more of the repeating units represented by (IV);
A coating layer disposed on at least one surface of the substrate and the substrate, the coating layer containing an adhesive and a pigment containing a latex having a glass transition temperature of 20 ° C. or higher, and the coating layer A coated paper preparation step of preparing a coated paper having a glossiness of 10% or more on the side of the arrangement;
A charging step for charging the electrophotographic photoreceptor;
Exposing the charged electrophotographic photosensitive member to form an electrostatic latent image; and
A developing step of developing the electrostatic latent image with toner to form a toner image;
A transfer step of transferring the toner image onto a surface on which the glossiness of the coated paper is 10% or more;
An image forming method comprising:

[In Formula (I), W ₁ represents a divalent organic group having an aromatic ring, and R ¹ and R ² are each independently a hydrogen atom, a substituted or unsubstituted hydrocarbon group, or a substituted or unsubstituted heterocyclic ring. R ³ and R ⁴ each independently represent a halogen atom or a substituted or unsubstituted hydrocarbon group, and k ₁ and k _{2 each} represent an integer of 0 to 4. ]

[In Formula (II), W ₂ represents a divalent organic group having an aromatic ring, X represents a divalent organic group having a monocyclic or polycyclic ring, and R ⁵ and R ⁶ are each independently a halogen atom. or a substituted or indicate the unsubstituted hydrocarbon group, k ₃ and k ₄ represent an integer of 0 to 4. ]

[In Formula (III), W ₃ represents a divalent organic group having an aromatic ring, R ⁷ and R ⁸ each independently represent a halogen atom or a substituted or unsubstituted hydrocarbon group, and k ₅ and k ₆ Represents an integer of 0 to 4. ]

[In Formula (IV), W ₄ represents a divalent organic group having an aromatic ring, Y ₁ and Y ₂ each independently represent an alkylene group, and R ^{9 to} R ¹² each independently represent a hydrogen atom, substituted or An unsubstituted hydrocarbon group or a substituted or unsubstituted heterocyclic group; R ¹³ and R ¹⁴ each independently represents a halogen atom or a substituted or unsubstituted hydrocarbon group; and k ₇ and k ₈ are 0 to 4 N represents an integer of 0 to 150. ]   A copolymer in which the arylate resin-containing layer has at least one repeating unit represented by the general formula (I), (II) or (III) and a repeating unit represented by the general formula (IV); Or a mixture of at least one homopolymer having a repeating unit represented by the general formula (I), (II) or (III) and a homopolymer having a repeating unit represented by the general formula (IV). The image forming method according to claim 1, further comprising:   The image forming method according to claim 1, wherein the coating layer contains kaolin clay and / or talc.   The image forming method according to claim 1, wherein the arylate resin-containing layer further contains fluorine-based resin fine particles.   The image according to any one of claims 1 to 4, wherein the content of the fluororesin fine particles is 3 to 40% by weight based on the total solid content of the arylate resin-containing layer. Forming method.   The image forming method according to claim 1, wherein the allylate resin-containing layer further contains a fluorine-based polymer.   2. The transfer process according to claim 1, wherein the transfer process is an intermediate transfer type transfer process in which the toner image is transferred onto a surface of the coated paper having a glossiness of 10% or more through an intermediate transfer member. The image forming method according to claim 1. Comprising a conductive support and a photosensitive layer disposed on the conductive support, and on the side of the photosensitive layer farthest from the conductive support, the following general formula (I), (II), (III) or An electrophotographic photosensitive member provided with an arylate resin-containing layer containing a polymer having one or more repeating units represented by (IV);
A charging device for charging the electrophotographic photosensitive member;
An exposure apparatus that exposes the charged electrophotographic photosensitive member to form an electrostatic latent image;
A developing device for developing the electrostatic latent image with toner to form a toner image;
A coating layer disposed on at least one surface of the substrate and the substrate, the coating layer containing an adhesive and a pigment containing a latex having a glass transition temperature of 20 ° C. or higher, and the coating layer A transfer device for transferring the toner image onto the surface of the coated paper having a glossiness of 10% or more on the surface on which it is disposed;
An image forming apparatus comprising:

[In Formula (I), W ₁ represents a divalent organic group having an aromatic ring, and R ¹ and R ² are each independently a hydrogen atom, a substituted or unsubstituted hydrocarbon group, or a substituted or unsubstituted heterocyclic ring. R ³ and R ⁴ each independently represent a halogen atom or a substituted or unsubstituted hydrocarbon group, and k ₁ and k _{2 each} represent an integer of 0 to 4. ]

[In Formula (II), W ₂ represents a divalent organic group having an aromatic ring, X represents a divalent organic group having a monocyclic or polycyclic ring, and R ⁵ and R ⁶ are each independently a halogen atom. or a substituted or indicate the unsubstituted hydrocarbon group, k ₃ and k ₄ represent an integer of 0 to 4. ]

[In Formula (III), W ₃ represents a divalent organic group having an aromatic ring, R ⁷ and R ⁸ each independently represent a halogen atom or a substituted or unsubstituted hydrocarbon group, and k ₅ and k ₆ Represents an integer of 0 to 4. ]

[In Formula (IV), W ₄ represents a divalent organic group having an aromatic ring, Y ₁ and Y ₂ each independently represent an alkylene group, and R ^{9 to} R ¹² each independently represent a hydrogen atom, substituted or An unsubstituted hydrocarbon group or a substituted or unsubstituted heterocyclic group; R ¹³ and R ¹⁴ each independently represents a halogen atom or a substituted or unsubstituted hydrocarbon group; and k ₇ and k ₈ are 0 to 4 N represents an integer of 0 to 150. ]   A copolymer in which the arylate resin-containing layer has at least one repeating unit represented by the general formula (I), (II) or (III) and a repeating unit represented by the general formula (IV); Or a mixture of at least one homopolymer having a repeating unit represented by the general formula (I), (II) or (III) and a homopolymer having a repeating unit represented by the general formula (IV). The image forming apparatus according to claim 8, wherein the image forming apparatus is contained.   9. The transfer apparatus according to claim 8, wherein the transfer apparatus is an intermediate transfer type transfer apparatus that transfers the toner image onto a surface having a glossiness of 10% or more through an intermediate transfer member. Or the image forming apparatus according to 9.

Images