JPS6057346A - Image bearing member - Google Patents

Abstract

PURPOSE:To improve surface smoothness, cleanability, abrasion resistance, etc., by coating the image bearing layer of an image bearing member for bearing an electrostatic image and/or a toner image with a coating soln. contg. hydrophobic silica. CONSTITUTION:The image bearing layer of an image bearing member composed of a substrate 21 and said layer for bearing an electrostatic image and/or a toner image is coated with a coating soln. contg. hydrophobic silica. Said layer is, e.g., a photoconductive layer 22 or a protective layer 23 formed on the layer 22. The layer 22 may be a functionally separated type composed of an electrostatic charge generating layer and a charge transfer layer, and in this case, preferably, the transfer layer is overcoated with the generating layer. As a result, the image bearing member can be improved in surface smoothness, cleanability, abrasion resistance, and adhesion of the surface layer to the underlayer by incorporating the hydrophobic silic powder in the coating soln. for forming the surface layer on which an electrostatic image and/or a toner image is to be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image holding member for holding an electrostatic image and/or a toner image, and particularly an image holding member having improved surface properties, abrasion resistance, and durability. be.

The present invention relates to an image holding layer that forms an electrostatic image and/or toner image corresponding to input of various information signals on the surface of an image holding member used in an electrophotographic copying machine, a laser printer, an image display device, etc. However, they are formed by various processes. Image holding members on which electrostatic images and/or toner images are formed include image holding members that have a photoconductive layer and those that do not have a photoconductive layer, which are called electrophotographic photoreceptors. Image bearing members typically consist of a support and an image bearing layer thereon.

Electrophotographic photoreceptors have various configurations in order to obtain predetermined characteristics or depending on the type of electrophotographic process to which they are applied. For example, there are photoreceptors in which a photoconductive layer is formed on a support, and photoreceptors in which an insulating layer is provided thereon. A typical example of this is, for example, US Pat. No. 2,111,60048,
Special Publication No. 41-16429, Special Publication No. 5B-1544
Publication No. 6, Special Publication No. 3713 (1973), Special Publication No. 42-
23910 Publication, Special Publication No. 43-24748, Special Publication No. 42-19747 Publication No. V "F Publication No. 56-4
It is described in Publication No. 121, etc.

There is also a photoreceptor in which the photoconductive layer has a laminated structure consisting of a charge generation layer and a charge transport layer. For example, JP-A-49-105
No. 537, JP-A No. 51-90827, U.S. Patent No. 34
No. 84237 and US Pat. No. 3,871,882.

A predetermined electrophotographic process is applied to the electrophotographic X photoreceptor to form an electrostatic image, and this wP electrophotographic image is developed and visualized.

There is also an electrophotographic process in which a photoconductive layer is used as an image holding member and a toner image is formed simultaneously with exposure. (Japanese Patent Application No. 56-197410, etc.) An example of using the process is shown in FIG. 2(a) and FIG. 2(1)).

FIG. 2(a) is a longitudinal sectional side view showing a very schematic structure of an example of an image display device of the above type. 1 is a vertical device exterior box; 2 is a display image viewing window formed with a large opening on the front surface of the exterior box; generally a transparent plate 3 such as a glass plate is attached thereto;

Reference numeral 4 denotes an endless belt type photoreceptor (image carrier, hereinafter simply referred to as belt) stretched between a driving pulley (or roller) 5 and a driven pulley (same) 6, which are installed horizontally in the upper and lower parts of the outer box. (abbreviated). For example, as shown in FIG. 2(b), the belt is made of a transparent and strong pace sheet material 41, such as a synthetic resin sheet or film, which is coated with metals or metal oxides (indium oxide, tin oxide, oxide, etc.) on the outer surface. A transparent conductive layer 42 is formed by thinly vapor-depositing chromium), which is used as a transparent conductive base layer 43, and a photoconductor N44 is laminated on the surface of the conductive layer 42 by a coating method, a vapor deposition method, etc. The outer peripheral surface of the belt 4 is the photoconductor layer surface. The belt 4 is rotationally driven in the direction of the arrow by the rotation of the drive pulley 5, and the tension side outer surface of the belt 4 moves past the display image viewing window 2 from the bottom to the top.

Reference numeral 10 denotes a light beam scanning type optical image exposure device disposed in the space between the tension side belt part and the slack side belt part of the rotating belt, which includes a semiconductor laser (or gas laser), a polygon mirror, and an f-theta lens. Consists of etc. Then, it receives a time-series electric digital pixel signal S from an image reading device, an electronic fraud device, etc. (not shown), and oscillates a laser beam L modulated in accordance with the signal in the direction of the driven pulley 6. The oscillated beam is deflected on the way by Mi 2-11 toward the back side part A of the driven pulley 6 of the side belt, and passes through the slit 12a of the slit plate 12 to pass the belt back part A in the belt width direction. scan and expose.

This scanning of the laser beam L in the belt width direction is referred to as main scanning,
The movement of the belt 4 is performed as a width scan, and the back surface of the belt 4 is sequentially exposed to light images.

Reference numeral 15 denotes a developing device disposed at a position on the front side of the belt corresponding to the back side part A of the belt that receives the laser beam scanning exposure;
Reference numeral 4 designates a second ring for irradiating the entire surface with light, which is disposed on the h-plane 111j of the tension side belt at the downstream side of the exposure area A in the belt movement direction.

The illustrated developing device 13 includes a developer storage box 15 and the box 1.
A rotary developing sleeve 16 made of a non-magnetic material such as stainless steel or aluminum, which is horizontally disposed inside the box and whose left side half curve is exposed to the outside from inside the box, and a magnet row 217 that is inserted and built into the sleeve 16. It consists of a developer applying blade 18 to the outer surface of the sleeve and a developer (conductive magnetic toner) T housed in a box 15. The conductive magnetic toner T in the box 15 is attracted by the magnetic field of the magnet roller 17 inside the sleeve, and is held on the outer peripheral surface of the sleeve as a magnetic adsorption layer, rotating together with the sleeve, and the toner near the rotating developing sleeve 16 is attracted by the magnetic field of the magnet roller 17 inside the sleeve. At step 18, the layer thickness is regulated and layered, and the toner layered surface comes into contact with and passes through the belt surface portion corresponding to the light image exposure area on the back side of the belt by rotation of the sleeve.

A DC bias is applied between the conductive layer 42 on the side of the belt 4 and the developing sleeve 16, and E indicates the power source.

Accordingly, when image exposure is started on the exposure area A on the back side of the belt 4 while the belt 4 and the developing device 16 are driven, the image is displayed on the front side of the belt on the side of the developing sleeve 16 according to the principle described later. The conductive toner is selectively adhered to form a toner image corresponding to the X-ray image. The belt surface on which the toner image has been formed is rotated to a position within the range of the image viewing window 2 and once stopped. As a result, an image is displayed on the second window. After a predetermined period of time has elapsed, or by operating the belt re-rotation button, the belt 4 is rotated again and the next display image is moved to the window 2, and the bell (bell) is temporarily stopped and the image is displayed. By repeating this process, the images are sequentially displayed.

After the image display ends, the belt rotates and the developing device 1 is turned on again.
The displayed toner images on the belt surface that have reached the three positions are removed from the belt surface by the developing and cleaning action of the developing device and are collected into the developing device. On the belt surface from which the toner image has been removed, toner images corresponding to the light image exposure pattern at the exposure area A are sequentially formed, and as the belt 40 rotates, the toner images are transferred to the display window 2 part.

The entire surface light irradiation lamp 14 passes through the light image exposure area A and irradiates the photoconductor 44 of the belt 4 uniformly in the width direction on the good side of the tape on which the toner image is formed on the front side. It is arranged to separate the internal electrical status of each part.

The above-mentioned system that displays images by forming them as toner images on the surface of an image carrier using a photoconductor has good resolution and is stationary compared to, for example, CRT display devices and display devices that use liquid crystals. Since the image does not flicker, and unlike a liquid crystal display, the angle dependence is small, the image is easy to see and reduces eye strain.For those that require a displayed image, the toner image formed on the belt surface is transferred to the copy paper surface. It has the advantage that 71 copies can be easily obtained by adding a mechanism. Particularly, as in the above example, a toner image forming system that is non-charging and uses simultaneous exposure, and also has both development and cleaning functions, has an extremely simple device configuration and is highly practical.

Typical I/R configurations of old image holding parts that have a photoconductive layer are:
A typical example of the use of an image holding member having an insulating layer as an image holding layer will be explained below.

(1) For example, Japanese Patent Publication No. 52-7115, Japanese Patent Publication No. 52-7115,
As described in Japanese Patent Publication No. 2-8204 and Japanese Patent Publication No. 43-1559, an electrostatic image formed on an electrophotographic photoreceptor is coated with 16 photoconductive layers for the purpose of improving the repeatability of the electrophotographic photoreceptor. A phenomenon is performed by transferring the image to an image holding member that does not have the image,
The toner image is then transferred to a recording medium.

An image holding member used in this electrophotographic process.

(2) There are still other electrophotographic processes in which an electrostatic image is formed on an image holding member without a photoconductive layer in correspondence with an electrostatic image formed on an electrophotographic photoreceptor, for example,
34s-3o No. 520, Japanese Patent Publication No. 4B-5065, Japanese Patent Application Laid-open No. 51-341, etc., a screen-shaped electrophotographic photoreceptor having many fine openings is exposed to a predetermined number of electrons. An electrostatic image is formed by a photographic process, and an image holding member without a photoconductive layer is subjected to corona charging treatment via this electrostatic LiL image, thereby modulating the ion flow in the glass and exposing the electrostatic image to light. Examples include a process in which a conductive layer is formed on an image holding member without a conductive layer, developed with toner, and transferred to a recording medium to form a final image.

An image holding member used in this electrophotographic process.

(3) In addition, according to other electrophotographic processes, a toner image formed on an electrophotographic photoreceptor or an image holding member without a photoconductive layer is not directly transferred to a recording medium, but instead a toner image formed on an electrophotographic photoreceptor or an image holding member without a photoconductive layer is provided with another photoconductive layer. Then, the toner image is transferred from this image holding member to a recording medium and fixed.

An image holding member used in this electrophotographic process. This process is particularly useful for forming color images or for high speed copying. Recording media are usually highly flexible, such as paper or film, so even if a three-color image is accurately aligned and transferred onto the recording media, there will be almost no deformation. A more accurately registered color image is formed by transferring a three-color image to an image-bearing member, which can be formed from a coating material, and then transferring it to a recording medium all at once.

In addition, toner i1! also helps speed up copying. II i
It is effective that & is transferred to the recording medium via the image holding member.

(4) In addition, an electric signal is applied to the electrically shielding body having the image holding member using a needle electrode. An image is obtained and a toner image is formed (Utility Model Publication No. 57-55061, etc.).

(5) Additionally, an easily magnetizable stylus is used to visualize magnetic powder or magnetic fluid toner on the image holding portion surface according to the magnetization signal.

The image holding member used in items (1) to (5) requires physical and electrical properties, but the durability and cleanability of the image holding member are also important. It is a characteristic. Durability is a property required when the image holding member is used repeatedly, and cleanability is the property required to remove residual toner that adheres to the surface of the image holding member. This significantly affects the formation of clear images and also the prevention of damage to the cleaning means.

Conventional image holding members do not have satisfactory surface smoothness and abrasion resistance, and have the disadvantage that when used repeatedly, scumming becomes noticeable due to poor cleaning.

SUMMARY OF THE INVENTION An object of the present invention is to provide a novel image holding member that eliminates the above-mentioned drawbacks.

Another object of the present invention is to provide an image holding member that has improved surface properties, y-wearing properties, and abrasion resistance.

Such objects of the present invention are achieved by an image bearing member containing hydrophobic silica.

The silica powder used in conventional image holding members is expanded using water as a dispersion medium, and countless silica particles are dispersed in the water.
Further, stabilized silica particles are known, as well as silica particles dispersed in a hydrophilic a-solvent that is easily miscible with water, such as methane or ether alcohol. Such water-dispersed silica powder has problems in the selection and limitation of resins and hygroscopicity.

The hydrophobic silica powder used in the present invention is produced by hydrophobically treating the surface of the silica particles by, for example, replacing the silanol groups of the water-dispersed silica particles with an organosilicon halide or alcohol. The solvent can be allowed to run for 11 minutes. Such silica powder is
-The particle size is extremely fine, ranging from tens to hundreds of squares, and the surface area per unit weight is extremely large, ranging from tens to hundreds of m2/g.
Even when dispersed in a solvent, it remains colloidally dispersed and stabilized. Furthermore, by evaporating the solvent from this dispersion, colloidal silica firmly adheres to the uneven parts of the substance and exhibits good adhesive properties. When hydrophobic silica powder was mixed, dispersed, and applied in a resin and an organic solvent, the surface became smooth after drying, and adhesiveness was increased.

A commercially available product of this type of hydrophobic silica powder is 1 Aerosi #R-972'' (manufactured by Nippon Aerosi/I/■).

'08CAP'', '08CAL'' (Catalyst Chemical Industry ■
(manufactured by), 1 White Carbon, etc. can be used.

The image holding member of the present invention is characterized in that it contains the above-mentioned hydrophobic silica powder. Therefore, in this type of image holding member, hydrophobic silica powder is contained in the surface layer that forms an electrostatic image and/or a toner image, so that the image holding member has improved surface smoothness, cleanability, abrasion resistance, and Adhesion between the surface layer and the underlying layer to be adhered to can be significantly improved.

The present invention will be explained below with reference to the drawings.

When the image holding member is an electrophotographic photoreceptor, it consists of a conductive substrate, a photoconductive layer W1, or a daughter protective layer.

A preferred embodiment of the present invention is shown in FIGS. 1(a) and (1).
) as shown in PIIJ Lium dyes or their eutectic complexes, Thiapyrylium dyes or their eutectic complexes, cyanine dyes, phthalocyanin pigments, anthoanthrone pigments, dibenzpyrenequinone gll, bi2nd p Inorganic photoconductive substances such as lead, cadmium sulfide, selenium, and hydrophobic An electrophotographic photoreceptor may be used in which a photoconductive layer 22 containing electroconductive silica together with a binder is provided on a conductive substrate 21.

In another embodiment of the present invention, as shown in FIG. 2(1)),
Photoconductive layer 22 containing a photoconductive substance together with a binder
As the retention layer 23, a film containing the aforementioned hydrophobic silica in a binder can be used.

Examples of binder resins used in the photoconductive layer 22 and protective layer 25 used in the electrophotographic photoreceptor shown in FIGS. 1(a) and (b) include acrylic resin, polyacrylate, polyester, polycarbonate, polystyrene,
Acrylonitrile-styrene copolymer, acrylonitrile-butadiene copolymer, polyvinylbutylene 9-)
@z, insulating resins such as polyvinyl formal, polysulfone, polyacrylamide, polyamide, chlorinated rubber, or poly=H-vinylcarbazole, polyvinylanthracene, poly and nylpyrene, etc. can be contained in an appropriate ratio, and the binder resin The content of the above-mentioned silica powder is 1 to 200 parts by weight, preferably 1 to 10 parts by weight, based on 100 parts by weight of the binder resin. Further, as a dispersion method, the purpose can be achieved by a generally used dispersion method such as a homogenizer or a ball mill.

In this embodiment, the light guide 1! contains hydrophobic silica powder on a conductive substrate 21! A protective layer 2 forming the layer 22 or containing hydrophobic silica powder on the photoconductive layer 22
3 can be formed.

Further, the above-mentioned photoconductive layer 22 can also be a laminated structure in which the charge generation layer and the charge transport layer are separated in function. The charge generation layer is formed by providing an amorphous silicon film, a copper phthalocyanine vapor-deposited film, a selenium-tellurium vapor-deposited film, a perylene pigment vapor-deposited film, a squaric acid methine dye vapor-deposited film, etc. on the conductive substrate 21. Also, azo LtI materials such as disazo pigments and trisazo pigments, copper phthalocyanine,
A coating formed by dispersing a 7-thalocyanine pigment such as aluminum chloride rhamnotalocyanine, vanadyl phthalocyanine, metal 7-leaf tetracyanine, a bi17ium dye or its eutectic complex, a thiapyrylium dye or its eutectic complex in a binder. The charge transport layer is preferably formed by overcoating the charge generating layer. Examples of the electron transporting substance include lyp-ruanyl, fluoroanil, tetracyanoethylene, tetracyanoquinodimethane, 2,4.7-) dinitro-9-fluorenone, 2.4.5. 7-tetranitro-9-fluorenone, 2,4.7-)lini) a-9-dicyanomethylenefluorenone, 2,4,5.7-teto-2-nitroxanthone, 2,4.8-)rito hole transport properties The substances include pyrene, N-ethylcarbazole, N-inflovircarbazole, N-methyl-M-phenylhydrazino-3-methylidene-9-ethylcarbazole, N,N
-diphenylhydrazino-6-methylidene-9-ethylcarbazole, N,N-diphenylhydrazino-3-methylidene-10-ethylphenothiazine, N,N-diphenylhydrazino-3-methylidene-10-ethylphenoxazine, Diethylaminobenzaldehyde N
, N-diphenylhydehyde, XS-diethylaminobenzaldehyde-N-α-naphthyl-N-phenylhydride, P-pyrrolidinobenzaldehyde-N,N-
Dienylhydrazone, 1,5.1-) dimethylindolenine-ω-aldehyde-N,N-diphenylhydro2
hydrazoyl compounds such as P-diethylbenzaldehyde-6-methylbenzthiazolinone-2-hydrazone, 2
,5-bis(P-diethylaminophenyl) -1,1
,4-oxadiazole, 1-phenyl-3-(P-diethylaminostyryl)-5-(1'-diethylaminophenyl)pyrazoline, 1-(quinolyl+2)) -
3-(P-diethylaminostyryl)-5-(P-diethylaminophenyl)pyrazoline, 1-[pyridyl(2
) ) -3-(P-jethylaminostirik)+5
+ (P-diethylaminophenyl)pyrazoline, 1-
[6-Me)xy-pyridyl+2) -3-(P-diethylaminostirik)-5-(P-diethylaminophenyl)pyrazoline, 1-[pyridyl(5)) -3
-(1'-diethylaminosteryl)-5-(P-diethylaminophenyl)pyrazoline, 1-[lepidyl(
2) ) -3-(P-diethylaminostyryl)-5
-(P-diethylaminophenyl)pyrazoline, 1-(
Pyridyl(2)) -5-(P-diethylaminostyryl)-4-methy/I/-5-(P-diethylaminophenyl)pyrazoline, 1-[Pyridyl(2))-
5-(α-methyl-P-diethylaminostyryl)-5
-(P-diethylaminophenyl)pyrazoline, 1-phenyl-3-(P-diethylaminostyryl)-4-methyl-5-(P-diethylaminophel)pyrazoly/
, 1-phenyl-6-(α-be/gi-P-diethylaminostyryl)-5-(P-diethylaminophenyl)
Pyrazolines such as pyrazoline and spirpyrazoline, 2
-(P-diethylaminosteryl)-6-dinithylaminobenzoxasol, 2-(P-diethylaminophenyl)-4-(p-diethylaminophenyl) -5
-(2-chlorophenyl)oxazole and other oxazole compounds, 2-(P-diethylaminostyryl)-6
-Thiazo-based compounds such as -dinithylaminobenzothiazole, triarylmethane-based compounds such as bis(4-diethylamino-2-methylphenyl)-phenylmethane,
1.1-bis(4-N,N-diethylamino-2-methylphenyl)hebutane, 1.1.2.2-tetrakis(
Polyaryl alkanes such as 4-N,N-dimethylamine-2-methylphenyl)ethane, triphenylamine, polyvinylpyrene, polyvinylant-2cene, polyvinyl acridine, poly-9-vinyl Examples include phenylanthracene, pyrene-formaltehyde resin, and ethylcarbazole formaldehyde resin.

Further, a specific example of an image holding member without a photoconductive layer is shown in FIG. 1(C). That is, in another embodiment of the present invention, a surface 24 obtained by containing hydrophobic silica powder in a binder is provided on the conductive substrate 21 as shown in Figure 1(c). be able to.

The surface layer 24 may also contain pigments or dyes such as titanium oxide, zinc oxide, tin oxide, etc. to provide suitable electrical resistance.

The conductive substrate 21 can be made of a material that is conductive itself, such as aluminum, copper, or stainless steel, and can be used in the form of a cylinder or a sheet. In addition, aluminum, aluminum alloy, indium oxide,
Plastics (e.g., polyethylene, polypropylene, polyvinyl chloride,
Polyethylene telecrate, acrylic resin, polyfluoroethylene! '), a substrate made of a plastic coated with tetraelectric particles (e.g. carbon black, silver particles, etc.) together with a suitable binder, a substrate made of plastic or paper impregnated with conductive particles, a plastic containing a conductive polymer, etc. Can be used.

Further, the conductive substrate 21 and the photoconductive layer 22 or the surface layer 24
An undercoat layer may be provided between the layers to provide a barrier function and an adhesive function. The undercoat layer is made of casein, polyvinyl alcohol, nitrocellulose, ethylene-acrylic acid copolymer, polyamide (nylon 6, Poohime 66, nylon 7610, copolymerized nylon, alkoxymethylated nylon, etc.), polyurethane, Ze2boon, oxidation. It can be formed from aluminum or the like.

As is clear from the above explanation, Mizumoto IJIj maintains stable artist quality in devices that form images by creating electrostatic images and/or toner images. It can be said that it is effective for all image forming methods, regardless of the image forming method. Therefore, the present invention is not limited to the examples shown below.

Example 1 1.0 parts by weight of the following electron-generating material, 0.5 parts by weight of cellulose resin and 98.5 parts by weight of methyl ethyl ketone (MIICK)
A coating solution for a charge generation layer was prepared by mixing and dispersing with an et mill. This coating solution was applied onto an aluminum cylinder by a dip coating method and dried to form a charge generation layer. The film thickness after drying was 0.1μ.

Next, 10 parts by weight of the charge transport material of the following Mizozo type, 20 parts by weight of styrene resin, and 1 part of the charge transport material hydrophobic silica powder were added.
A charge transport solution was prepared by dispersing 1 part by weight of Aerosil R-972'' (manufactured by Nippon Aesigil Co., Ltd.) in 120 parts by weight of toluene. This coating solution was dip-coated on the previously formed charge generation layer. The charge transport layer was formed by heating and drying this coating film at 100° C. for 60 minutes.The dry film thickness was 15 μm.

Comparative Example 1 Hydrophobic silica powder 6 Aerosil R-97,2'' in the charge transport layer used when producing the electrophotographic photoreceptor of Example 1
A comparative photoreceptor was prepared in exactly the same manner as in Example 1 except that (same as above) was removed.

The electrophotographic photoreceptors prepared in Example 1 and Comparative Example 1 were subjected to a corona charging process, and a halogen lamp was used as a light source.
It is installed in an electronic copying machine that has a light process, a dry toner development process, a toner transfer process to plain paper, a cleaning process using a urethane rubber blade, and a static electricity removal light process, and can be used continuously for two
000 copy images were formed. The copy images obtained with the photoreceptor adjusted in Example 1 are the initial one and the 2000
When compared with the second image, it was found that there was almost no change in image quality (background stains), and both images were of good quality. In the photoreceptor prepared in Comparative Example 1, the copy image obtained on the 2000th sheet had significant background staining and was not of good image quality compared to the copy image obtained at the initial stage.

Further, after the 2000th copy image was obtained, the photoreceptor was taken out and its surface was observed, and it was found that the surface of the photoreceptor of Example 1 according to the present invention was hardly contaminated. However, residual toner was adhered to the photoconductor of Comparative Example 1, and when the toner was removed, scratches and abrasion marks were observed on the photoconductor surface, indicating that it was contaminated.

Example 2 Zinc oxide powder 151i and rose bengal dye o, o s
g and hydrophobic silica powder 6Aeroge/I/R-972”
(Same as above) 2g and acrylic resin 6-dial LR4
72″ (Mitsubishi Rayon ■#8.9 in toluene 20m1
and Km in 2 td of methyl alcohol and dispersed in a ball mill to prepare a dispersion. This solution was applied onto an aluminum cylinder by dip coating method and heated to 100°C.
, dried for 40 minutes. The dry film thickness was 15μ.

When this photoreceptor was attached to the electrophotographic copying machine used in Example 1 and copy images were created in the same manner, there was a difference between the initial copy image and the 2000th copy image. There was almost no change in image quality, and the image quality was good in all cases. Further, after copying the 2000th sheet, the photoreceptor was removed from the electrophotographic copying machine and its surface was observed, and it was found that there was no residual toner adhering to the surface, and the surface was clean and free from scratches.

Example 3 A photoconductive layer was prepared using the same recipe as in Example 2 except that 6AEROSIL R-972'' was omitted, and then 30 weight of polyarylate resin ``U-100'' (manufactured by Unitika) was added on top of it. and 2 parts by weight of hydrophobic silica powder 6 Aerosil R-972' (same as above) are dispersed in 100 parts by weight of chlorobenzene, and this solution is applied onto the previously formed photoconductive layer by a dip coating method, A protective layer was obtained by drying at 100° C. for 50 minutes.The dry film thickness was 1 μm.

When the photoreceptor produced in Example 3 was attached to the electrophotographic copying machine used in Example 1 and copy images were produced in the same manner, both the initial copy image and the 2000th copy image were obtained. There was almost no change in image quality, and all images were of good quality. Further, after copying the 200.0th sheet, the photoreceptor was removed from the electrophotographic copying machine and its surface was observed, and it was found that there was no residual toner adhering to the surface, and the surface was clean and free from scratches.

Example 4 A semiconductor laser (820 nm) doped with Cu and In
) and 7 parts by weight of polybutyl methacrylate having an average molecular weight of 10,000 were made into a dispersion liquid in methyl ethyl ketone and kneaded in a four-lumen mill to prepare a coating liquid.

This coating solution was applied to a transparent conductive base film CF; LEC-
The photoconductive layer was coated on KIG (Daicel Chemical Industry Co., Ltd.) using a four-layer coater to form a photoconductive layer with a dry film thickness of 6 μm.

Next, 40 parts by weight of TlO2 pigment, 10 parts by weight of Polymethylenef (Nippon Steel Chemical Co., Ltd. Estyrene M-200), hydrophobic silica powder (manufactured by Nippon Aeμsil Co., Ltd., Ae4sil R-
972) Add 1 part by weight to toluene to make a solid content ratio of 50
The solution was mixed with a weight percent solution and dispersed using a sand mill to prepare a coating solution with W and q. The TlO2 pigment was added for the purpose of increasing the whiteness of the image display surface and adjusting the electrical resistance of the surface layer.

This coating solution was applied onto the previously formed photoconductive layer using a four-wheel coater so that the dry film thickness was 5 μm, and then dried.

The image holding belt fcfXc2 created here is shown in FIG.

Drive suspended on the image display device to display the image 'f, repeat 5
When the test was repeated 000 times, there was almost no change in image quality between the initial and 5000th display images, and all images were of good quality. Also, after displaying the image 5000 times,
I looked at the image display surface, but there was a lot of dirt on the surface.
The surface was clean and free of scratches.

Example 5 CrO2 on polyester film as image holding belt
A thin film was prepared by coating the surface layer shown in Example 4 on a magnetic chip to a dry film thickness of 10 microns.

The image forming process using the belt was constructed in the same way as the apparatus shown in Figure 2, except that instead of a laser scanner, a magnetic head was installed in front of the developing station, and a bar code pattern signal was generated. A latent magnetization image was created by inputting In addition, in the developing machine shown in FIG. 6, the fixed magnet roll built into the rotating sleeve 16 is one that does not magnetize the developing area. This is for the purpose of not disturbing the magnetic latent image. The toner image created with this device had sufficient contrast to be readable by an OCR head. Further, in this configuration in which the erasing process was performed by thermally quenching from the back side of the image holding belt, stable OCR read signals were always obtained even when images were repeatedly formed on the image holding belt.

[Brief explanation of drawings]

FIG. 1(&), FIG. 1(b) and FIG. 1TO) are cross-sectional views of the image holding member of the present invention. FIG. 2 (IL) is a schematic diagram showing an example of a display device, and FIG. 2 (1) is an enlarged sectional view of a developing device portion thereof. 21...Conductive substrate 22...Photoconductive layer 25...Protective layer 24...Surface layer Patent applicant: Canon Co., Ltd. 41 &PL Procedural amendments stamped by the Commissioner of the Japan Patent Office Mr. Manabu Shiga 1, of the case Display Patent Application No. 165468 of 1982 2, Name Image Holding Member 3 of the Invention, Relationship with the Amendment Person Case Patent Applicant Address 3-30-2 Shimomaruko, Ota-ku, Tokyo Name (100)
) Canon Co., Ltd. Representative: Ryu Kaku, Department 4, Agent address: 3-30725 Shimomaruko, Ota-ku, Tokyo 146, Specification to be amended Document 6, Contents of the amendment (1) The scope of the patent claims has been corrected as shown in the attached sheet. do. (2) On page 12, lines 15 and 16 of the specification, the phrase "Such objects of the present invention are achieved" has been replaced with "Such objects of the present invention are achieved by applying coatings containing hydrophobic silica." This is achieved by an image holding member having an image holding layer formed by applying a liquid.'' (3) "In the surface layer" on page 14, line 9 of the same document is corrected to "in the coating liquid that forms the surface layer." In this specific example, the photoconductive layer 22 is formed by applying a coating liquid for forming the photoconductive layer 22 containing hydrophobic silica powder onto the conductive substrate 21. The protective layer 23 can be formed by applying a coating liquid for forming the protective layer 23 containing hydrophobic silica powder onto the protective layer 22.'' 2. An image holding member characterized by the claims. (2) The image holding member according to claim 1, wherein the image holding layer is a photoconductive layer. (3) The image holding member according to claim 1, wherein the image holding layer is a photoconductive layer. The image holding member according to claim 1. (4) The image holding member according to claim 2 or 3, wherein the photoconductive layer is a laminated structure of a charge generation layer and a charge transport layer. (5) The image holding member according to claim 3. 5. An image bearing member according to claim 4, wherein a charge transport layer is overcoated on the charge generation layer.

Claims (5)

[Claims] (1) An image holding member for holding an electrostatic image and/or a toner image, wherein the image holding member Jt4 contains hydrophobic silica. (2) The image holding member according to claim 1, wherein the image holding layer is a protective layer for a photoconductive layer. (3) The image holding member according to claim 1, wherein the image holding layer is a photoconductive layer. (4) The image holding member according to claim 2 or 3, wherein the photoconductive layer is a laminated structure of a charge generation layer and a charge transport layer. (5) The image holding member according to claim 4, wherein the charge transport layer is overcoated on the charge generation layer.