JPS60146241A - Manufacture of recording body of electrophotographic sensitive body or the like - Google Patents

Abstract

PURPOSE:To execute an effective stirring without requiring a stirring device by jetting a coating liquid passing through a gap between a spacer and a cylindrical supporting body, when immersing the supporting body by moving up and down relatively a cylinder and the supporting body. CONSTITUTION:A cylindrical supporting body 2 is made to descend gradually toward in a coating liquid, but as the supporting body 2 is inserted into the coating liquid, the coating liquid being at the lower side of a spacer 3 rises through a gap of the spacer 3 and the supporting body 2, and it is jetted to the upper part of the spacer 3. When passing through the gap, the speed of the coating liquid is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a recording medium such as an electrophotographic photoreceptor,
In particular, the present invention relates to a method for producing a recording medium such as an electrophotographic photoreceptor in which the physical properties of the coating liquid are made uniform to obtain a coating layer having the physical properties of J171.

Conventionally, a method for manufacturing an electrophotographic photoreceptor by dipping a cylindrical support in a coating solution is known as a dip coating method (see JP-A-49-130736, etc.).

When coating a support using the dip coating 4F method, it is extremely important for the coating film to be formed that the physical properties of the coating solution are uniform. However, there are many factors that cause the physical properties of the coating solution to be non-uniform.

For example, on the surface of a coating liquid, evaporation of the solvent is noticeable, and this evaporation is particularly noticeable in solvent-based coating liquids. The concentration of the liquid may become considerably higher than that of the previous one, causing the physical properties of the coating liquid to become non-uniform, or in extreme cases, a skin may appear on the surface of the coating liquid.
1ji is formed.

Therefore, it is possible to use an IW stirring device as a means of making the physical properties of the four-cloth liquid uniform, but for example, a conventional impeller! l (If a stirrer is used, it is necessary to take it out after the stirring is finished and the next time the support is immersed, and it must be put back in again during the next stirring. To eliminate this problem, it is possible to increase the cylinder capacity and create a space where the agitator can be stored at all times, but increasing the cylinder capacity not only requires a larger amount of coating liquid, but also increases loss due to evaporation. It has drawbacks such as being uneconomical.Furthermore, when using an impeller-type agitator, it is difficult to prevent fires.
- Since it is necessary to use an explosion-proof type, there are disadvantages in that the device becomes too large and the equipment cost increases.

An object of the present invention is to be able to perform efficient stirring without the need for an IW stirring device, and to achieve simple and low-cost I/W stirring.
It is an object of the present invention to provide a method for producing a recording medium such as an electrophotographic photoreceptor, in which uniform physical properties of a coating liquid can be obtained by stirring using the apparatus described above, and a coated r+i layer having desired physical properties can be obtained.

The object of the present invention is a method for manufacturing a recording medium such as an electrophotographic photoreceptor, which comprises applying a coating liquid to a cylinder in a predetermined groove, immersing a cylindrical support in the coating liquid, and then coating the same. A gap is provided between the support and a spacer fixed on the inner surface of the cylinder at a position that will be in the coating liquid when the support is immersed, and the cylinder and the support are placed relative to each other. - Achieved by a method for manufacturing a recording medium such as a photographic photoreceptor, which is characterized in that when the support is moved downward and immersed, the coating liquid passing through the gap is ejected.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

The figures are schematic cross-sectional views showing one embodiment of the present invention, in which Figure 1 shows the state before the support is dipped into the coating liquid, and Figure 2 shows the state in the middle of immersing the support in the coating liquid. FIG. 3 shows a state in which the support is immersed in the coating solution.

In the figure, l is a cylinder and 2 is a cylindrical support. The shape of the cylinder 1 is not particularly limited, but is preferably cylindrical, for example, and preferably has an inner diameter slightly larger than the outer diameter of the support 2 to reduce the gap between the cylinder 1 and the support 2. Further, as the support 2, metals such as aluminum, nickel, copper, zinc, palladium, silver, indium, tin, platinum, gold, iron, stainless steel, and brass are used.

Note that the cylindrical shape in the shape of the support body 2 means that the shape of both ends is not particularly limited as long as at least the body part is cylindrical. A shaped member or portion may be added.

3 is a spacer fixed to the inner surface of the cylinder 1 so as to be movable up and down. The size of the spacer 3 is determined so that a gap is formed between it and the support 2 during immersion. The width of the gap is not particularly limited, but is preferably several mm to several tens of mm. The position where the spacer 3 is provided is preferably below the level of the coating liquid in which the support 2 is immersed, but it may be above the liquid level of the fabric or in a position where it will be in the coating liquid when the support 2 is immersed. Bye.

A ring member may be used as the spacer 3, and may be provided along the inner surface of the cylinder 1, or may be formed into a vane-shaped spacer. One or more may be formed, or the surface of the ring member facing the support 2 may have a spiral-like marking that gives a twist to the passing liquid, or an uneven marking such as a gravure roll. . Further, the spacer 3 may be one annular body as shown in the figure, but one or more annular bodies may be arranged in parallel in the vertical direction. They may be arranged in parallel so that their heights become lower or higher from top to bottom. By arranging two or more spacers 3 in parallel at different heights in this manner, the gap between them and the support 2 can be varied to achieve efficient stirring.

To carry out stirring using the arrangement 'i'+';, first, the support 2 in the position shown in FIG. 1 is gradually lowered into the coating liquid. As shown in FIG. 2, as the support 2 is inserted into the coating solution, the coating solution below the spacer 3 closes the gap between the spacer 3 and the support 2 by 1-yl, and is subjected to shearing force. It squirts out above the spacer 3.

Note that in this specification, the term "spout" refers to the increase in the speed of the coating liquid when it passes through the upper limit gap, and includes everything from a slight increase in speed to a large speed increase, up to so-called jetting according to y7. This jetting causes the coating liquid to become agitated, for example, in a turbulent state. As the support 2 is gradually immersed, the coating fH5 solution rises to the position shown in FIG. During this time,
- Note #: The shearing force action on the fabric fluid continues.

Since there is a risk of liquid stagnation near point A below the spacer 3 in section L, a through hole is provided in the annular spacer 3 as described above, or a through hole is provided in the spacer 3.
You may also place a magnetic stirrer on top of the rice bowl to add stirring.

The explanation below is for the case where the support body 2 is lowered, or conversely, the cylinder 1 may be lowered.
Of course, it is also possible to move the two in opposite directions at the same time.

After the support 2 is immersed in the liquid while being stirred by shear force or a jet stream as described above, coating can be carried out by lifting the support 2 or lowering the cylinder 1.

By the method of the present invention, a subbing layer can be formed by coating a coating solution on a support, and a photosensitive layer (carrier generation layer and/or
or a carrier transport layer).

When forming an undercoat layer, a solution that improves the adhesion between the support and the photosensitive layer is selected as the coating solution. When forming a carrier generation layer, for example, an organic film (
is dispersed or dissolved. Examples of the organic pigment include the following.

P-(1) Monoazo face 1, bisazo face sting, l-lisuadi pigment, polyano face old, gold, metal complex azo face; Azo pigments such as P-(2) perylene-based pigments such as perylene anhydride and imyl perylenic acid P-(3) anthraquinone derivatives, anthanthrone derivatives, dibenspirenequinone derivatives, pyranthrone derivatives, violanthrone derivatives, inviolan Anthraquinone or polycyclic bovine pigments such as thoron derivatives P-(4) Indigo derivatives, thioindi=1', 4S
Indikoite pigments P-(5) such as +4 phthalocyanines, phthalocyanine pigments P-(B) such as metal phthalocyanines and metal-free phthalocyanines, and P-1 pigments such as bisvegezimidazole derivatives.
) Non-type pigments IP-(7) Quinacridone-based pigments P-(8) Cyanine-based and merocyanine-based pigments ゛IP-
(9) Quinoline Pigment When forming a carrier transport layer by the method of the present invention, the carrier transport substance used in conjunction with the binder resin is generally classified into electron-donating substances and electron-E accepting substances. , a large number of organic compounds are selected as appropriate. Specifically, the following compounds described in JP-A-57-67934-) can be prepared.

T-(1) Carbacil derivative T-(2) Pyranphosphorus derivative T-(3) Oxacyal derivative T-(4) l-lyarylamine derivative T-(5) Stilbene derivative T-(B) Polyarylalkane derivative T-(7) Hydrazone derivative T-(8) Imidazole 11^ Conductor T-(l])) Lyazole derivative T-(10) Phenyldiamine derivative T-(+1)l
・Lini I・rofluorenone derivative T-(12) @ converted chalcone derivative As is clear from the explanation in 1-, the present invention does not require a stirring device and the coating 4j passes through the gap between the spacer and the support. Since the liquid is stirred by jetting the liquid, IW striking using a simple and low-cost device allows 4! [It is possible to obtain uniform physical properties of the i-liquid.

[Brief explanation of drawings]

The figures are schematic cross-sectional views showing one embodiment of the present invention, in which Figure 1 shows the state before the support is dipped into the coating liquid, and Figure 2 shows the state in the middle of immersing the support in the coating liquid. 3 shows a state in which the support is immersed in the coating solution. In the figure, 1 represents a cylinder, 2 represents a cylindrical support, and 3 represents a spacer. 4.1 Applicant: Agent of Koshiroku Photography Co., Ltd.
Goi, Jll! Satoshi Nobuhiro Sakaguchi (and 1 other person)

Claims (1)

[Claims] Paint it on the cylinder! Fill the specified amount of G liquid and apply the appropriate amount! In a method for manufacturing a recording medium such as an electrophotographic photoreceptor, in which a cylindrical support is immersed in μ liquid and then coated with the same, when the support is immersed on the inner surface of the cylindrical surface, does the cylindrical support become immersed? I': A gap is provided between the spacer fixed at a position in the fabric liquid and the support, and when the cylinder and the support are moved up and down relative to each other to immerse the support, the spacer passes through the gap. 1. A method for producing a recording medium such as an electrophotographic photoreceptor, which comprises jetting out a coating liquid.