JPS59142555A - Manufacture of electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To rapidly peel the end of a photosensitive body by dipping said end into a solvent and applying ultrasonic waves. CONSTITUTION:A solvent 4 for dissolving a part to be removed is placed on a solvent tray 3 having a depth corresponding to the height of said part. An ultrasonic vibrator is fixed to the tray 3. Its output is controlled to an extent not causing waves of the solvent surface, and usually to 5-50W. A time of ultrasonic waves to be applied is sufficient so long as a coating film can be removed, and usually it is 5sec-2mins dependent on its output. Their frequency is usual, and within about 20-80kHz.

Description

[Detailed description of the invention] The present invention relates to an example of a method for manufacturing an electrophotographic photoreceptor.

Manufacturing an electrophotographic photoreceptor by coating is more advantageous in terms of productivity, cost, book collection, etc. than manufacturing by other methods. Coating methods include the u, 1ffl method, Rona coat, bar code, knife coat, blade coat, and spray coat.

However, for example, a dip coating method is used in which the substrate is immersed in a coating liquid and then pulled up at a certain speed for coating.

In this case, the coating liquid is applied to all the immersed parts.

On the other hand, when a cylindrical electrophotographic photoreceptor is actually used in an electronic copying machine, both ends of the cylinder are subjected to conductive treatment or various abutment objects are brought into contact, so a photosensitive layer or resin layer is coated. It is preferable that it is not. That is, as shown in FIG. 1, it is preferable that the photosensitive layer 2 is not provided at both ends and the substrate 1 is exposed.

It is easy to expose the substrate at the upper end of the electrophotographic photoreceptor if that part is not immersed in the coating process. However, since the lower end is dipped, it is always coated, so it is necessary to peel it off after coating.

The main object of the present invention is to provide a method for manufacturing an electrophotographic photoreceptor in which the lower end of the electrophotographic photoreceptor can be easily removed in such a case.

The method for producing an electrophotographic photoreceptor according to the present invention includes immersing the end portion of the resin layer or photosensitive layer formed on the surface of the electrophotographic photoreceptor in a solvent that dissolves the resin layer or photosensitive layer, and applying ultrasonic waves. This method is characterized in that it is removed by.

That is, simply immersing the part to be removed in a solvent that dissolves the photosensitive layer etc. takes a long time to dissolve.
By applying ultrasonic waves, the coating film can be dissolved and removed in a short time. An example is shown in FIG.

The solvent pan 3 contains a solvent 4 that dissolves the part to be removed.
Put in. The depth may be adjusted according to the depth of the part to be removed. An ultrasonic vibrator 5 is attached to the solvent pan. The output of the ultrasonic wave may be an output that does not cause ripples on the liquid surface, and is usually about 5 to 50 W. The application time of the ultrasonic wave may be a time that allows the coating film to be removed, and is approximately 5 seconds to 2 minutes, depending on the output. Frequency is normal 20-80
About KHz is fine.

As in the present invention, the method of removing the paint film using ultra-high waves can remove the paint film much more easily and in a shorter time than the method of scraping the paint film with a brush or brush. This method is also suitable for automating photographic photoreceptor manufacturing equipment.

Note that it is also effective to rotate the substrate or the solvent pan when applying ultrasonic waves to make the surface to be removed more clean.

Next, an electrophotographic photoreceptor manufactured by coating will be described. The photosensitive layer is CdS, CdSe.

Inorganic photoconductive powders such as Se and dye-sensitized ZnO1, and organic photoconductive substances such as polyvinylcarbazole, pyrazoline, oxadiazole, and phthalocyanine are dispersed together with a binder resin as needed, and then applied. Ru.

Organic photoconductive materials have advantages over inorganic materials, such as high productivity and low cost, but their sensitivity is inferior, so an effective way to improve this is to separate the functions by laminating a charge generation layer and a charge transport layer. Type photosensitive layer Azo pigments such as Roux and Jenas Green B, quinone pigments such as Algol Yellow, Pyrenequinone, and Indanthrene Brilliant Violet RRP, indigo pigments such as quinocyanine pigments, perylene pigments, indigo and thioindigo, and India First Orange toner. Charge transport substances such as bisbenzimidazole pigments, phthalocyanine pigments such as copper phthalocyanine, and quinacridone pigments are combined with binders such as polyester, polystyrene, polyvinyl chloride, polyvinyl acetate, acrylic, polyvinylpyrrolidone, methylcellulose, hydroxypropylmethylcellulose, and polyvinyl butyral. It is formed by dispersing it in resin and coating it on a substrate.

The charge transport layer provided on the charge generation layer contains a polycyclic aromatic compound such as anthracene, pyrene, phenanthrene, coronene, or indole, carbazole, oxazole, isoxazole, thiazonyl, imidazole, pyrazole, or oxazole in the main chain or side chain. diazole, pyrazoline,
It is formed by dissolving a charge-transporting substance such as a compound having a nitrogen-containing cyclic compound such as thiadiazole or triazole, or a hydrazone compound in a resin that has film-forming properties. This is because the charge transporting substance generally has a low molecular weight and has poor film-forming properties by itself. As such resins, polyesters, polysulfones, polycarbonates, polymethacrylic esters, polystyrene, styrene-acrylonitrile copolymers, styrene-methacrylic ester copolymers, and the like may be used alone or in combination.

In addition, it is used between the substrate and the photosensitive layer to improve the adhesion between the photosensitive layer and the substrate, to improve the coating properties of the photosensitive layer, to preserve the substrate, to cover defects on the substrate, to protect the photosensitive layer from electrical damage, and to protect the photosensitive layer from electrical damage. An undercoat layer may be provided to improve the carrier injection properties of the layer.

Materials include polyurethane, nylon, polyvinyl alcohol, epoxy, polyamide, polyester,
Examples include polyvinyl acetate, ethylene-vinyl acetate copolymer, casein, gelatin, phenolic resin, cellulose acetate, and nitrocellulose.

It can also be used to protect one photosensitive layer, to improve the mechanical strength of the photoreceptor, to improve the dark decay characteristics, or to add a single or multiple layer on top of the photosensitive layer to protect the photosensitive layer, improve the mechanical strength of the photoreceptor, improve the dark decay characteristics, or apply it to certain electrophotographic processes. An insulating layer made of a resin layer may also be provided. Materials for this insulating layer include thermoplastic resins such as polyester, poly(meth)acrylates, polystyrene, polyarylates, polyvinyl chloride, vinyl chloride-vinyl acetate copolymers, polyvinyl butyral, epoxies, polyurethanes, alkyds, Thermosetting resins such as melamine and cyclized butadiene rubber, and photocuring resins such as epoxy acrylate, polyester acrylate, urethane acrylate, and unsaturated polyester are used.

The method according to the present invention can be used to remove the bottom and end portions of the electrophotographic photoreceptor in any layer process (in the case of a curable resin, before curing).

Example 1 Copolymerized nylon resin (product name: Amilan CM-8000
(manufactured by Toshi, Inc.) (100 parts by weight, hereinafter the same) was dissolved in a mixed solution of 600 parts of methanol and 300 parts of toluene. This solution was used as a coating liquid and was applied to an aluminum drum of 60φ x 260m+n by a dipping method. At this time, 7m++ from the top
Dip up to that point and apply to the areas below. After dipping, the coating was applied by pulling it up at a rate of 10 cm/min, and was dried by heating at 80° C. to form a layer with a thickness of 0.5 μm. This is the subbing layer.

Thereafter, as shown in FIG. 2, methanol was poured into a solvent dish up to 7 wn, the lower part of the drum was immersed, and ultrasonic waves with an output of 10 W and a frequency of 40 K1-1z were applied. By applying the voltage for 10 seconds, clean peeling was possible. When no ultrasonic waves were applied, it took more than 1 minute and 30 seconds to peel off cleanly.

Example 2 10 parts of a disazo pigment having the following structural formula, 6 parts of cellulose acetate butyrate resin (trade name: CAB-381: Eastman Chemical Exhibition), and 60 parts of cyclohexanone were dispersed for 20 hours using a sand mill device using lφ glass beads. . Add methyl ethyl ketone (
100 parts of MEK) was added to prepare a coating solution for a charge generation layer.

The drum prepared in Example 1 and coated with the undercoat layer was immersed in the coating solution up to 7wn0 points from the top.

Thereafter, the coating was applied by pulling up at a speed of 11 cm/min. As shown in Figure 2, place this substrate in a solvent pan up to 7 Mn
K was added and immersed, and as in Example 1, ultrasonic waves with LOW output were applied. Although it was possible to peel off cleanly by applying an ultrasonic wave for 20 seconds, it was not possible to peel off simply by immersing it in a solvent without applying ultrasonic waves.

After peeling, dry at 80°C and get 70cm/n? A charge source 1- was formed with a coating amount of .

Example 3 10 parts of a hydrazone compound having the following structural formula and 10 parts of polystyrene resin (trade name: Dialex) (F-55: manufactured by Mitsubishi Monsando Kasei) were dissolved in 80 parts of toluene to form a charge transport layer coating solution. did.

The drum coated with the charge generation layer prepared in Example 2 was immersed in this coating solution up to the 7th mark from the top, and after coating 10 tb, M E K was poured into the solvent pan up to the 7th mark to coat the substrate. Then, in the same manner as in Example 1, ultrasonic waves with an output of 10 W were applied. Although it was possible to peel off by applying ultrasonic waves for 10 seconds, it took 30 seconds when no ultrasonic waves were applied.

After peeling, it was dried at 100° C. for 1 hour to form a charge transport layer, thereby preparing an electrophotographic photoreceptor.

As described above, by using ultrasonic waves in the step of peeling off the lower end, it has become possible to perform the peeling quickly.

[Brief explanation of drawings]

FIG. 1 is a side view of the electrophotographic photoreceptor with the photosensitive layer at the end removed. Figure 2 shows applying ultrasonic waves to remove the edges 1
It is an explanatory diagram of an aspect. ■...Substrate, 2...Photosensitive layer, 3...Solvent container, 4...
...Solvent, 5...Ultrasonic vibrator. Applicant Canon Co., Ltd.

Claims (1)

[Claims] (11) An electronic method characterized by immersing the end of the resin layer or photosensitive layer formed on the surface of the electrophotographic photoreceptor in a solvent that dissolves the resin layer or photosensitive layer and removing it by applying ultrasonic waves. A method for manufacturing a photographic photoreceptor.