JPH0572749A - Production of image holding member - Google Patents

Abstract

PURPOSE:To provide the process for production of the image holding member which allows writing with light of 780nm wavelength and with which copying of many sheets can be executed by one time of image exposing. CONSTITUTION:The image holding member is produced by applying a coating liquid for forming a charge generating layer on the surface of a conductive layer 2 of a base body 1 having a conductive surface to form a charge generating layer 3, applying a coating liquid contg. a charge generating material and a thermal softening resin thereon to form a thermal softening layer 4 and further, applying a conductive particle dispersion contg. conductive particles thereon to form a conductive particle dispersion layer 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an image holding member which stores image information by moving conductive particles embedded in the vicinity of the surface of a heat softening layer in a heat softening resin.

[0002]

2. Description of the Related Art In the conventional electrophotographic copying method, the surface of an electrophotographic photosensitive member is uniformly charged, then imagewise exposure is performed to attenuate the surface potential in an imagewise manner, and then toner development is performed. The Carlson method of transferring to paper is widely applied as a general method. However, in this method, each time one image is copied, exposure must be performed once. Therefore, high-speed copying complicates the device,
There was a problem of increasing the size.

In order to improve this point, a method has been proposed in which image information is stored in an electrophotographic photosensitive member and a large number of copies are obtained by one image exposure. For example, JP-A-53
-102037 and JP-A-2-269357 describe that a specific compound is added to a photosensitive layer to obtain a continuous photoreceptor. However, in terms of storage time of image information, contrast at the time of copying, etc., it is difficult to obtain a satisfactory one. On the other hand, U.S. Pat. No. 4,883,731 describes an electrophotographic system in which a photosensitive original plate in which photosensitive particles move inside a heat-softening layer to store image information is used to make a large number of copies. ..

FIGS. 10 to 17 are views for explaining the case. In these figures, reference numeral 80 denotes a photosensitive original plate, which is a substrate 81, a conductive layer 82, and a thermoplastic resin softened by heat. It is composed of a heat-softening layer 83 containing a charge transport material, and photosensitive particles 84 embedded in the vicinity of the surface of the heat-softening layer to generate charges by light.

In using this photosensitive original plate,
As shown in FIG. 10, first, by the corona charger 60,
The surface is uniformly negatively charged. Then, as shown in FIG. 11, imagewise exposure is performed with an image-like light beam 61. As a result, the photosensitive particles in the exposed portion generate positive and negative charges, the positive charges are transported to the surface to neutralize the surface charges, and the negative charges remain in the particles. Then, FIG.
As shown in 2, when heated by the heat ray 62, the charged particles in the photosensitive particles move in the layer softened by electrostatic attraction. That is, the particles 842 that move according to the image due to heating
Of the image holding member 9 in a state of being divided into a portion containing particles 841 and a portion containing particles 841 held in the state without moving.
0 is formed.

In order to make a copy using the image holding member 90 in such a state, first, as shown in FIG. 13, the surface is uniformly positively charged by the corona charger 71. Then Fig. 1
As shown in FIG. 4, light irradiation 72 is performed on the entire surface. Thereby,
The photosensitive particles generate electric charges, but since the portion having the particles 841 in the original position and the portion having the moved particles 842 have different potential attenuation characteristics, that is, the particles 84
Since the portion having 1 has a higher sensitivity and the attenuation is faster, a difference in surface potential occurs, and a latent image having a higher potential is formed in the portion having the particles 842. Then, as shown in FIG.
16 is used for developing, and further, as shown in FIG.
Form a toner image on top. After that, as shown in FIG.
The electric potential of the portion having is attenuated and the image holding member returns to the original state.

By repeating the steps shown in FIGS. 13 to 17 for this image holding member, it is possible to perform a copying operation on a large number of sheets by simply charging and irradiating the entire surface without the need for an image exposure step. The image holding member after the copying is unnecessary, so a new photosensitive original plate 80 is prepared again. Further, in the case of negative charging during uniform charging in FIG. 13, when the next whole surface irradiation 72 is performed, the surface charge of the portion having the particles 842 is attenuated and the portion having the particles 841 is developed. As a result, an inverted toner image is obtained as compared with the case shown in FIG.

[0008]

The electrophotographic method using the above-mentioned photosensitive original plate is a very preferable method when a large number of copies are made by one image exposure. However,
Since selenium is used as the photosensitive particles, there is a drawback that the spectral sensitivity is dominated by selenium. Figure 9
It is a graph which shows the spectral sensitivity characteristic of a photosensitive layer, B is the spectral sensitivity curve of the photosensitive layer which used selenium.

In recent years, as a light source for image exposure, a method of operating image-wise modulated laser light with a rotary reflecting mirror has become widespread with the progress of electronic technology. It is common practice to use 780 nm laser diodes. However,
As is clear from FIG. 9, the photosensitive layer using selenium is 78
Since it has no sensitivity to 0 nm, it has a drawback that an image cannot be written with such a laser beam. Furthermore, in the electrophotographic method, when copying,
There is a problem that the whole surface light irradiation as shown in FIG. 14 must be repeated for each sheet, and although image exposure is unnecessary, simplification of the process is still required.

It is an object of the present invention to provide a method of manufacturing an image holding member which is writable with light having a wavelength of 780 nm and which can make a large number of copies with one image exposure.

[0011]

According to the method for producing an image holding member of the present invention, a charge generation layer is formed by applying a charge generation layer forming coating liquid on the conductive surface of a substrate having a conductive surface,
A coating liquid containing a charge transporting substance and a thermosoftening resin is applied thereon to form a thermosoftening layer, and a conductive particle dispersion liquid containing conductive particles is further applied thereon. ..

Next, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic sectional view of an image holding member manufactured by the method of the present invention. An image holding member 10 has a conductive layer 2 formed on a substrate 1 and a charge generation layer 3 provided thereon. Furthermore, a heat-softening layer 4 made of a charge-transporting substance and a heat-softening resin that is softened by heat is provided thereon. Near the surface of the thermal softening layer 4, a conductive particle dispersion layer in which the conductive particles 5 are embedded is formed.

In the manufacturing method of the present invention, as the substrate, any one can be used as long as it can be used in an electrophotographic photoreceptor such as plastic film, paper, metal foil, glass and the like. The shape is not particularly limited, and any shape can be used.

The substrate must have at least a conductive surface. The conductive surface may be formed by providing a conductive layer. The conductive layer may be made of any material as long as the charge can flow freely. For example, a metal film is formed by a method such as a vapor deposition method, a sputtering method, a plasma CVD method, a plating method, or a metal or a metal having a low resistance is used. A conductive paint in which conductive particles such as oxides are dispersed in resin may be applied. Also, if the substrate is conductive, it is not necessary to form a conductive layer.

An undercoat layer may be provided on the conductive surface for the purpose of improving adhesiveness, charging property, image quality and the like. The undercoat layer can be formed by applying a coating solution for forming an undercoat layer. Examples of the resin used in the coating solution include polyvinyl alcohol, polyvinylpyrrolidone, polyvinylpyridine, cellulose ethers, and cellulose ester. Examples thereof include polyamides, polyurethane, casein, polyglutamic acid, starch, starch acetate, amino starch, polyacrylic acid, polyacrylamide and the like. Above all, JP-A-56-21
Type 8-nylon described in Japanese Patent No. 129,
Polyamide-based resins such as copolymerized nylon described in JP-A No. 52-7242 have excellent adhesiveness with metals, solvent resistance to a charge generating layer as an overcoat layer, stability of coating solution, and the like. It is an excellent material.

The undercoat layer may be composed of the above resin alone, but may be dispersed with a powder in order to scatter coherent light such as laser light and prevent the generation of interference fringes.
As the powder, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene fluoride, polyester, polystyrene, Teflon, organic resin such as silicone resin, titanium oxide, zinc oxide, silica, alumina, barium sulfate, calcium sulfate, kaolin, Inorganic powders such as calcium silicate, calcium carbonate, lead white, magnesium carbonate, lithopone, magnesium oxide, zirconium oxide, and cerium oxide can be given. These may be used alone or in combination of two or more. It is not preferable to use the conductive particles described below because they have charge injection properties. In addition to the above components, a conductive polymer, an electron donating or accepting substance, a carboxylic acid or sulfonic acid compound, a quaternary ammonium salt, etc. are added to the coating liquid for forming the undercoat layer. You may. Further, in order to improve the dispersibility of the powder, various surfactants, silane or titanate coupling agents, etc. may be added.

As a method for dispersing each of the above components, a conventional method is used, and for example, a ball mill, a sand mill, a roll mill or the like can be used for dispersion. The coating liquid for forming the undercoat layer is applied so as to have a film thickness of 0.5 to 5 μm. When the thickness of the undercoat layer is too thick, residual charges may be accumulated, which is not preferable. When powder is dispersed in the coating liquid for forming the undercoat layer, the surface of the undercoat layer becomes a rough surface. The roughness Ra is 0.1 to 0.
It is preferably 5 μm and Rmax is about 0.3 to 1 μm. If the roughness is large, it causes troubles such as coarse image quality.

In the present invention, first, the charge generation layer is formed on the conductive surface of the substrate, following the formation of the undercoat layer. The charge generation layer is made of the same material as that used to form the charge generation layer used in a usual function-separated electrophotographic photoreceptor. That is, as the charge generating material,
Phthalocyanine pigments such as metal or metal-free phthalocyanines, squarylium compounds, azurenium compounds, perylene pigments, indigo pigments, quinacridone pigments, anthanthrone, brominated anthanthrone, pyranthrone, flavanthron, and other polycyclic quinones, cyanine dyes, xanthene dyes. , A charge transfer complex composed of poly-N-vinylcarbazole and trinitrofluorenone, a eutectic complex composed of a pyrylium dye and a polycarbonate resin, and the like, and high sensitivity of titanyl phthalocyanine and azo pigments having various crystal structures are used. Materials of can be used. These charge generating materials can be used together with the charge transporting material if necessary.

The charge generating layer is prepared by dispersing the above materials together with a suitable binder resin and a solvent by a conventional method to prepare a charge generating layer coating solution, and then coating on the conductive layer or the undercoat layer and drying. Formed by removing the solvent. The coating method may be selected optimally according to the shape of the substrate,
Dip coat, spin coat, spray coat, atomizer, roll coat, bar coat, die coat, etc.
Either may be used. The thickness of the charge generation layer is usually
It is set in the range of 0.1 to 2 μm.

A thermal softening layer is then formed on the charge generating layer. The heat softening layer can be formed by applying a coating liquid containing a charge transport substance and a heat softening resin. As the charge transport substance, any substance can be used as long as it is used in the charge transport layer in the electrophotographic photoreceptor. For example, anthracene, pyrene, polycyclic aromatic compounds such as phenanthrene, indole, carbazole, compounds having a nitrogen-containing heterocycle such as imidazole, pyrazoline compounds, hydrazone compounds, triphenylmethane compounds, triphenylamine compounds,
Examples thereof include stilbene compounds and benzidine compounds.

As the thermosoftening resin, a thermoplastic resin having a glass transition point (Tg) of 30 to 90 ° C. and a viscosity at a temperature of Tg or higher of 10 ² to 10 ⁶ poise is preferably used. For example, polyethylene, vinyl chloride resin, polypropylene, styrene resin, ABS resin, polyvinyl alcohol, acrylic resin, acrylonitrile-styrene resin, vinylidene chloride resin, AAS
(ASA) resin, AES resin, fibrin derivative resin, thermoplastic polyurethane, polyvinyl butyral, poly-4-
Examples thereof include methylpentene-1, polybutene-1, rosin ester resin, and among them, a styrene-acrylic acid ester copolymer and a styrene-acrylic acid ester-acrylic acid terpolymer are particularly preferable.

The coating solution prepared by dissolving the above components in a suitable solvent is usually applied so as to have a film thickness in the range of 3 to 15 μm. As the coating method, the same coating method as described for the charge generation layer can be used, but since the film thickness is thicker than that of the charge generation layer, the conditions may be changed as appropriate or another coating method different from that for the charge generation layer may be used. The method can also be used.

In the present invention, a conductive particle dispersion liquid containing conductive particles is applied onto the heat-softening layer, and the number of diameters of the conductive particles from the surface of the image forming member is applied in the vicinity of the surface of the heat-softening layer. A layer containing conductive particles is formed within the range of double. The size of the conductive particles used in the present invention is from 0.05 to
The range of 1 μm is preferable. If the size of the conductive particles is too large, it becomes difficult for the conductive particles to move, and if it is too small, it becomes difficult to be charged, which is not preferable. Further, the conductive particles having a thin film shape are not preferable because they are difficult to move.

As the conductive material forming the conductive particles, carbon black, copper iodide, silver iodide, zinc sulfide, silicon carbide and the like, as well as metal oxides are preferably used. In particular, a metal oxide containing oxygen vacancies and a metal oxide containing a small amount of a hetero atom forming a donor with respect to the metal oxide used are preferable because they have high conductivity, that is, a large number of electron-hole pairs are contained. .. Examples of metal oxides include
ZnO, TiO ₂ , SnO ₂ , In ₂ O ₃ , MoO
₃ or the like, or composite oxides thereof, and examples of containing a different atom include Al, In, etc. for ZnO,
Examples include TiO ₂ containing Nb, Ta and the like, and SnO ₂ containing Sb, Nb and a heteroatom such as a halogen element. The amount of these different atoms added is 0.01 to 30.
The range of mol% is preferable, and the range of 0.1 to 10 mol% is particularly preferable.

The conductive particles do not move if they are attached only to the surface of the heat-softening layer. Therefore, in the present invention, the conductive particles need to be buried from the surface. is there. As a method therefor, (1) using a conductive particle dispersion liquid containing the same thermosoftening resin as that forming the heat softening layer together with the conductive particles, and heat softening the surface of the heat softening layer by coating. Method for forming a layer in which conductive particles are dispersed in a conductive resin, and (2) as a conductive particle dispersion liquid, a dispersion liquid in which conductive particles are dispersed in a solvent having solubility in the heat-softening layer. It is possible to employ a method in which the surface of the heat-softening layer is dissolved during application and the conductive particles are embedded. In the present invention, it is preferable that the conductive particle dispersion liquid contains a charge transport substance. Further, in order to improve the dispersibility of the conductive particles, a treating agent such as a surfactant, a silane coupling agent, a titanate coupling agent may be contained.

In order to embed the conductive particles in the vicinity of the surface of the thermal softening layer to form the conductive particle layer, vapor deposition (resistance heating, electron beam heating), ion plating,
Although a dry process such as a glow discharge sputtering method or an ion beam sputtering method can be used, it is disadvantageous in terms of cost, mass productivity, large area, and the like. Therefore, the coating method is used in the present invention.

FIG. 2 shows the image holding member produced by the method (1), and FIG. 3 shows the image holding member produced by the method (2). In FIG. 2, a conductive layer 2 is formed on a substrate 1, and a heat-softening layer 4 made of a charge-generating layer 3 and a charge-transporting substance and a heat-softening resin that is softened by heat is formed on the conductive layer 2. Conductive particles 5 are formed on the thermal softening layer 4.
A conductive particle dispersion layer 6 is formed by applying a conductive particle dispersion liquid containing a heat-softening resin and optionally a charge transport substance. The thickness of the conductive particle dispersed layer is preferably about 2 to 5 times the particle diameter of the conductive particles, and the ratio of the conductive particles in the layer is preferably about 2 to 20% by volume. If the ratio of the conductive particles is too large, the particles come into contact with each other, and the surface resistance decreases, which hinders image formation.

In the above case, if the thermosoftening resin in the electroconductive particle dispersion liquid is the same as that in the thermosoftening layer 5, the boundary between the thermosoftening layer and the electroconductive particle dispersion layer disappears due to evaporation of the solvent. preferable. As the solvent, those having solubility in the heat-softening layer, or those having no solubility may be used, but when a solvent having solubility is used, dissolution of the heat-softening layer is as described below. Care must be taken not to go too far.

In FIG. 3, on the softening layer 4, as a conductive particle dispersion liquid, a dispersion liquid in which the conductive particles 5 are dispersed in a solvent having solubility in the heat softening layer is applied, and the conductivity is improved. A layer containing particles 5 is formed. In this case, since the surface of the heat-softening layer is dissolved by the solvent, the conductive particles 5 are buried near the surface of the heat-softening layer, and a layer containing the conductive particles is formed. At this time, if the amount of the solvent is too much or the solvent is slowly dried, the heat-softening layer is excessively dissolved and the conductive particles move deep inside the heat-softening layer, which is not preferable. Therefore, it is preferable to pay attention to the drying after the application and to control the drying in about 3 to 10 seconds from the air drying (touch drying).

In the case of the above method (2), the surface may be slightly roughened, as schematically shown in FIG. 3, but this does not cause any particular problem. The coating amount of the conductive particles needs to be such that the particles do not come into contact with each other.

Next, an image forming method for storing image information by using the image holding member produced by the method of the present invention will be described with reference to the drawings. 4 to 7 are views for explaining the image forming method. First, as shown in FIG.
The corona charger 60 is moved relative to the image holding member 10 to negatively charge the surface. Thereby, the above-mentioned conductive particles have electron-hole pairs at room temperature,
Immediately, holes are released to the negative charge on the surface, and the surface charge is neutralized through the charge transport material. Then, the negative charges remain inside the conductive particles. At that time, when the surface potential is measured, it is about 80 to 95% as compared with the case where the conductive particles are not present.

Next, as shown in FIG. 5, image exposure is performed. Reference numeral 61 denotes light that sensitizes the charge generation layer, and most of the light reaches the charge generation layer 3 through the sufficiently thin conductive particle layer. In the case of laser diode light, it is image-wise modulated by an electronic means to be exposed, and at that time, light may be applied to a portion to which the developer is attached.
As a result, positive charges are injected from the charge generation layer into the thermal softening layer and are transported through the layer to neutralize the negative charges of the conductive particles. On the other hand, the conductive particles in the part that was not exposed to light,
Negative charge remains.

Thereafter, as shown in FIG. 6, the image holding member is heated by heat 62. As a heating method, any method such as a method of passing it through a heating roller, a method of putting it in a heating container, a method of heating with a heating wire, etc. can be adopted, and heating is performed at a temperature of Tg or higher for several seconds. As a result, the conductive particles having the negative charges remaining therein move to the side of the base body to be an electrode in the heat-softened layer which has been softened and whose viscosity has been lowered, by electrostatic attraction. On the other hand, the heating lowers the electric resistance of the thermosoftening layer, and the electric charge of the conductive particles suddenly discharges spontaneously.Therefore, the conductive particles do not all move to the electrode side, and the particle size and charge Due to variations in density, etc., they are sparsely distributed in the heat-softening layer and stop. In this way, a portion containing the moved conductive particles (moving particles 52) is formed.
Next, when the image holding member is returned to room temperature, the image holding member 20 in which the image information is stored is obtained.

Next, an electrophotographic method for obtaining a copy by using the image holding member in which the image information is stored as described above will be described. As shown in FIG. 7, the entire surface of the image holding member in which the image information is stored is negatively charged. As a result, the conductive particles that have not moved (non-moving particles 5
As in the case shown in FIG. 4, in the portion where 1) is present, negative charges remain on the conductive particles, and the surface potential is about 85 to 95% of the case where no conductive particles are present. On the other hand, in the portion where the moved conductive particles (moving particles 52) are present, positive charges are successively injected from particles closer to the electrode to neutralize the negative charges on the surface side, and as a result, The surface potential is 0 to 20%, which is very low compared to the case where no conductive particles are present. Therefore, with only uniform overall negative charging,
A latent image having an electrostatic contrast according to the image is formed.

The latent image thus formed is developed using a positively chargeable developer. This makes the latent image visible,
Then, a copy can be obtained by transferring onto a transfer paper by a conventional method.

Then, by recharging, a latent image can be formed as shown in FIG. 7, and therefore copying can be continuously performed without performing image exposure. After copying, cleaning can be performed as necessary.

[0037]

【Example】

Example 1 A 50 μm-thick polyester film having a conductive layer on which aluminum was vapor-deposited was used as a substrate. Cyclohexanone 19 parts by weight in advance with polyvinyl butyral resin (S-REC BM-1, manufactured by Sekisui Chemical Co., Ltd.) 1
8 parts by weight of a solution prepared by dissolving 1 part by weight is mixed with 1.6 parts by weight of X-type metal-free phthalocyanine and 12.8 parts by weight of cyclohexanone, and dispersed for about 1 hour by a paint shaker using glass beads having a diameter of about 2 mm as a dispersion medium. Processed. The obtained dispersion liquid is coated on a conductive layer with a wire bar and dried at 100 ° C. for 10 minutes to give a film thickness of 0.3 μm.
m charge generating layer was formed.

On the other hand, 62 parts by weight of styrene, 36 parts by weight of ethyl acrylate, and 2 parts by weight of acrylic acid were used as starting materials.
Weight average molecular weight of about 80 synthesized using toluene as solvent
00 terpolymer was prepared. The Tg of this polymer is 48
C. and the viscosity at 110.degree. C. was 28,000 poise. 78 parts by weight of this polymer and charge transport material: N,
N'-diphenyl-N, N'-bis (3-methylphenyl)-[1,1'-biphenyl] -4,4 'diamine 22
Parts by weight were dissolved in 500 parts by weight of toluene. The resulting solution was applied onto the charge generation layer with a wire bar and dried at 110 ° C. for 15 minutes to form a heat softening layer having a film thickness of 8 μm. This heat-softening layer functions as a charge transport layer, and its spectral sensitivity was measured, and the result shown by the curve A in FIG. 9 was obtained, showing sufficient practical sensitivity at the wavelength of 780 nm. It was confirmed to have.

Next, tin oxide-indium oxide (ITO)
Powder 1 part by weight, terpolymer 6 parts by weight, charge transport material 2 parts by weight, toluene 50 parts by weight and butanol 50.
A mixture consisting of parts by weight was treated with a ball mill to obtain a dispersion liquid. The average particle size of the dispersed particles was 0.35 μm. This dispersion was applied onto the heat-softened layer with a wire bar so that the film thickness after drying would be 0.6 μm. The formed image holding member had a sectional structure shown in FIG.

This image holding member was negatively charged under the condition of -800V. As a result, the negative charge was transferred to the ITO particles and the surface potential became −750V. (FIG. 4) Next, using a diode laser, 12 ergs / cm ²
Image exposure was carried out with the intensity of (FIG. 5). At that time, while the film was conveyed on a roller having a diameter of 25 mm, the bent portion was irradiated with a laser beam to prevent a stripe pattern from being generated in the image due to the interference of the laser beam. (See JP-A-1-281475) After that, in the dark, the film was passed over a heat roll kept at 115 ° C. for a heating time of 5 seconds to perform overheat treatment. As a result, the ITO particles in the unexposed portion moved to the substrate side. (FIG. 6) As described above, the storage by writing the image is completed.

The image holding member in which the obtained image information is stored is wrapped around an aluminum pipe of 108 mm × 340 mm, charged with −800 V, developed with a two-component positively charged developer, transferred to A4 paper, and brush cleaned. It was attached to the electrophotographic copying machine for carrying out. As shown in FIG. 7, the portion charged with the charger 60 has a surface potential of −20 V in the portion containing the moving particles 52 and the non-moving particles 5.
The portion containing 1 formed a latent image with a surface potential of -750V. This latent image was developed with a two-component positively charged developer and transferred to obtain a copy image having a high contrast. This process was repeated at a speed of 100 sheets per minute. As a result, it was confirmed that there was no problem even if continuous 2000 sheets were copied.

Example 2 An image holding member was prepared in the same manner as in Example 1 except that tin oxide-antimony oxide (SnO ₂ —Sb ₂ O ₃ ) powder was used in place of the ITO powder used in Example 1. Was manufactured.
The average particle size of the powder after dispersion was 0.28 μm.

Example 3 An image was obtained in the same manner as in Example 1 except that the perylene-based pigment represented by the following structural formula was used instead of the X-type metal-free phthalocyanine which was the charge generation material used in Example 1. A holding member was manufactured.

[0044]

When the obtained image holding member is used, the wavelength of 6
Image exposure was performed using an 80 nm diode laser. Other than that, when the same processing as in Example 1 was performed, high-speed copying was possible.

Example 4 Coating on a film was continuously carried out by a web coater. FIG. 8 is a side view of the web coater, in which the film is fed from the roll 16 and the paint drawing roll 1
The coating liquid is applied to the film surface by means of 3 and the coating roll 12, passes through the drying zone 14 and is dried, and is wound up by the winding roll 15. Reference numeral 17 is a pressing roll, and 18 is an exhaust duct. The film thickness can be controlled by the concentration of the coating liquid, the rotation speed of the coating roll, and the like. With this web coater, using the same substrate and material as in Example 1, the charge generation layer was 30 cm / sec, the thermal softening layer was 20 cm / sec, and the conductive particle dispersion layer was 40 cm / sec.
Coating was performed at a speed of 2 seconds to obtain a coating film having a length of 100 m. By this method, a large amount of image holding members could be manufactured. Further, the obtained image holding member could be used as in the case of Example 1.

A charge generation layer and a thermal softening layer were formed in the same manner as in Example 1. Next, 1 part by weight of ITO powder was added to a solvent consisting of 20 parts by weight of toluene and 40 parts by weight of methylene chloride, and dispersed by a ball mill. At that time, 0.05 part by weight of a silane coupling agent (trade name: A1100, manufactured by Nippon Unicar Co., Ltd.) was added to improve dispersibility. The average particle size of the ITO particles after dispersion was 0.25 μm. The obtained dispersion was applied onto the heat-softening layer with a wire bar. After air-drying time of 3 seconds, it was allowed to stand for 20 seconds and then dried at 100 ° C. for 10 minutes. Since methylene chloride used as a solvent has a strong solubility in the heat-softening layer, the surface of the heat-softening layer is in a dissolved state for a short time, and the ITO particles are near the surface of the heat-softening layer. Although it entered, the state was only about 3 seconds because the evaporation rate of methylene chloride was very high. Therefore, the ITO particles are
It did not penetrate to the center of the inside of the heat-softened layer and was buried in the vicinity of the surface. The obtained image holding member could be used in the same manner as in Example 1.

[0048]

Since the present invention has the above-mentioned structure,
It is possible to easily and in large quantities manufacture an image holding member capable of continuously making a large number of copies at high speed and continuously by performing image exposure once. Further, by selecting a charge generating material during manufacturing, it becomes possible to manufacture an image holding member applicable to a wide range of exposure light sources, for example, a wavelength of 78
An image bearing member can be manufactured that can be used for a 0 nm diode laser.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an image holding member created according to the present invention.

FIG. 2 is a cross-sectional view of an image holding member created according to an example of the present invention.

FIG. 3 is a sectional view of an image holding member made according to another embodiment of the present invention.

FIG. 4 is an explanatory diagram of an image forming process using an image holding member formed according to the present invention.

FIG. 5 is an explanatory diagram of an image forming process using an image holding member formed according to the present invention.

FIG. 6 is an explanatory diagram of an image forming process using an image holding member formed according to the present invention.

FIG. 7 is an explanatory diagram of an electrophotographic method using an image holding member produced according to the present invention.

FIG. 8 is a side view of a web coater for making the imaging member of the present invention.

FIG. 9 is a graph showing spectral sensitivity characteristics of a photosensitive layer.

FIG. 10 is an explanatory diagram of an image forming process using a conventional image holding member.

FIG. 11 is an explanatory diagram of an image forming process using a conventional image holding member.

FIG. 12 is an explanatory diagram of an image forming process using a conventional image holding member.

FIG. 13 is an explanatory diagram of an electrophotographic method using a conventional image holding member.

FIG. 14 is an explanatory diagram of an electrophotographic method using a conventional image holding member.

FIG. 15 is an explanatory diagram of an electrophotographic method using a conventional image holding member.

FIG. 16 is an explanatory diagram of an electrophotographic method using a conventional image holding member.

FIG. 17 is an explanatory diagram of an electrophotographic method using a conventional image holding member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Substrate, 2 ... Conductive layer, 3 ... Charge generation layer, 4 ... Thermal softening layer, 5 ... Conductive particles, 6 ... Conductive particle dispersion layer, 10 ... Image holding member, 20 ... Image holding that stores image information Member, 51
... Non-moving particles, 52 ... Moving particles, 60 ... Corona charger,
61 ... light, 62 ... heat.

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[Procedure amendment]

[Submission date] September 14, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

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[Figure 8]

[Figure 9]

[Figure 10]

FIG. 11

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[Fig. 13]

FIG. 15

FIG. 17

FIG. 14

FIG. 16

Claims (3)

[Claims] 1. A coating solution for forming a charge generation layer is formed on a conductive surface of a substrate having a conductive surface to form a charge generation layer, and a coating containing a charge transport substance and a thermosoftening resin is formed on the charge generation layer. A method for producing an image holding member, comprising applying a liquid to form a heat-softening layer, and further applying a conductive particle dispersion liquid containing conductive particles thereon. 2. The method for producing an image holding member according to claim 1, wherein the conductive particle dispersion liquid contains a charge transport material and / or a heat softening resin together with the conductive particles. 3. The method for producing an image holding member according to claim 1, wherein the solvent in the conductive particle dispersion liquid has solubility in the heat softening layer.