JPS60146239A - Manufacture of recording body of electrophotographic sensitive body or the like - Google Patents

Abstract

PURPOSE:To execute an immersing application even in case of coating liquid whose dispersing stability is bad, by moving relatively a supporting body and the coating liquid before applying it to a cylindrical supporting body, and exerting a shearing force in the longitudinal direction of the surface of the supporting body. CONSTITUTION:A cylindrical supporting body is immersed into coating liquid obtained by dispersing a photosensitive material to a dispersant, and when coating it, at least before coating it to the supporting body, the supporting body and the coating liquid are moved relatively, and a shearing force is exerted in the longitudinal direction of the surface of the supporting body. As for a means for exerting the shearing force, there are methods such as (1) only the supporting body is moved up and down, (2) only the cylinder is moved up and down, (3) both the supporting body and the cylinder are moved up and down, (4) the coating liquid is pressed in from the lower part of the cylinder, and (5) the coating liquid is pressed in from the upper part of the cylinder, etc. The method of (4) or (5) and the methods of (1)-(3) can be combined.

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 a coating film with uniform physical properties can be formed using a dip coating method.

Conventionally, a method of manufacturing an electrophotographic photoreceptor by dipping a cylindrical support in a coating solution containing a photosensitive material and coating it is known as a dip coating method (Japanese Patent Laid-Open No. 49-13
(See Publication No. 0736, etc.).

As coating liquids used in such dip coating methods, there are known solvent-based coating solutions in which a photosensitive material is dissolved in an organic solvent and dispersion-based coating solutions in which a photosensitive material is dispersed in a dispersant. succumbs to the latter technique, which uses dispersion coating methods.

When a dispersion type coating liquid is used, there is a problem of aggregation of the photosensitive material from the viewpoint of homogenizing the physical properties of the coating liquid, and in particular, when the viscosity of the coating liquid is low, secondary aggregation occurs. There is. In order to solve this problem, measures such as adding a dispersion stabilizer or increasing the viscosity (above concentration) can be considered. This is undesirable because of the increase in the concentration of clay, that is, the increase in viscosity, which slows down the coating speed, takes more time to coat, and in some cases reduces the required film thickness.
There is a problem that I+1 cannot be obtained.

In addition, in order to eliminate agglomeration of the photosensitive material and obtain a uniform coating film, we adopted an electrophoresis method in which the photoreceptor was immersed for 7 m, and the photosensitive material was electrodeposited (Japanese Patent Laid-Open No. 58 −
According to this method, there is a problem of explosion of volatile scum generated from the coating liquid, and if explosion-proof measures are taken, a huge amount of cost will be added to the equipment. There is.

The purpose of the present invention is that even if the coating liquid has poor dispersion stability,
It is an object of the present invention to provide a method for manufacturing a recording medium such as an electrophotographic photoreceptor, which can be coated by dip coating without causing aggregation of photosensitive materials.

Another object of the present invention is to provide a method for producing a recording medium such as an electrophotographic photoreceptor, which makes it possible to obtain a coating film with uniform physical properties on a cylindrical support.

Still another object of the present invention is to provide a method of manufacturing recording bodies such as electrophotographic photoreceptors at low cost and safely by dip coating that does not require electrodeposition.

The object of the present invention is to provide a method for producing a recording medium such as an electrophotographic photoreceptor in which a cylindrical support is immersed in a coating solution containing a photosensitive material and a dispersant, and then coated with the same. A method for producing a recording medium such as an electrophotographic photoreceptor, which comprises moving the support and the coating solution relative to each other at least before coating the support to apply a shearing force in the longitudinal direction of the surface of the support. achieved by.

The method of the present invention will be specifically explained below.

In the method of the present invention, a cylindrical support (hereinafter referred to as a support) is used.

) means that after the support is immersed in the coating solution, the contact between the support and the coating solution is not broken and the state remains immersed.

In the method of the present invention, the means for relatively moving the support and the flT liquid and applying shearing force in the longitudinal direction of the support surface include [1] a method of moving only the support up and down, [2] a method of moving only the support Method of moving up and down, [3] Method of moving both the support and cylinder up and down, [4] Silling of the coating liquid.
Method of press-fitting from the bottom and [5] Applying the coating liquid to the cylinder
Examples include a method of press-fitting from two parts.

In Part 2 [1], shearing force can be exerted, for example, when the relative movement speed between the support and the coating liquid is preferably loCm/see or more and the vertical movement time is 5 seconds or more. If the relative movement speed is less than locm/sec, aggregation of the photosensitive material may be observed, which is not very common. Note that the above -1° moving speed is based on the viscosity of the coating liquid or several hundred Cp.
It is applied to a relatively low viscosity coating liquid of S or less (here, the viscosity is 7111 constant centrifugation after 1 minute of rotation using a BL type B-type 1-part meter and rotating a No. 10-ter at 8 Orpm). ), for example, 10,000 Cp if the viscosity becomes high.
In the case of a high viscosity such as S, there is a problem that although it does not aggregate, it cannot be coated, and there is little scope for applying the method of the present invention. Therefore, the method of the present invention is intended for coating liquids with relatively low viscosity.

1. As described above, the shearing force exerted by moving the support up and down has a vector in the longitudinal direction of the support surface, and its magnitude is maximum at the support surface and decreases toward the sill.

J, Note [2] When the force is 1 large, the up-down movement speed and 4-down movement time of the cylinder may be the same as the up-down movement speed and up-down movement time of the support in the method (1) above. . The shearing force generated by the upward movement of the syringe has a vector in the longitudinal direction of the support surface, and its magnitude is small at the support surface, or the average shearing force applied to the entire coating solution is different from the method (1) above. It is preferable that it be determined appropriately so that it does not change much.

The method described in Paragraph [3] is a method that combines the method described in Paragraph [1] and Method [2], and it is preferable that the vertical movement directions of the support and the cylinder are opposite to each other, Even in the same direction, the upper and lower moving speeds may be different, and the difference may be appropriately determined so that a shearing force comparable to the shearing force generated by method (1) or [2] is generated.

``- Note [4] One person press-fits the coating liquid from the sill F part using a pump, and from the top (preferably a position slightly higher than the first surface of the liquid). The shearing force exerted by this is in the longitudinal direction of the support, upward from the top, and its magnitude is approximately midway between the support and the support. is the largest. In this case, the liquid may not be drawn out from the top of the cylinder, but may be allowed to overflow and temporarily stored in another tank, or this liquid may be newly press-fitted.

1 [5] is a method in which the coating liquid is press-fitted from the top of the cylinder toward F, and then pulled out from the top in an amount equivalent to the amount of the press-in liquid, and the shearing force is applied in the longitudinal direction of the support, and Works downwards from

In the present invention, when applying a shearing force such as "biped", the support is always immersed in the coating solution. Shear force imparting action caused by putting the material in and taking it out of the coating solution is undesirable because it may cause foaming of the coating solution.

In the present invention, the method [4] or [5] above may be combined with the method [1], [2], or [3] above. Furthermore, the method of the present invention may be combined with a technique of applying a shearing force in the tangential direction of the circumferential surface of the support, as described in Patent IM (B) by Hitoshi Motoyama, filed on the same day.

In the method of the present invention, it is necessary to apply the shearing force as described above at least before coating the support, but "at least" here means that it is sufficient to apply the shearing force before coating; This shearing force may be applied at the time of application in addition to before application.

The photosensitive material, support, separation agent, etc. used in the present invention are not particularly limited, but for example, those described below can be used.

For example, an organic pigment is used as a material for photosensitization, and specific examples include the following pigments.

P-(1) Monoazo pigment, bisazo pigment, trisazo pigment 1, polyazo face 1, metal complex 11 azo pigment, birasolon amphokil, Stilhenan face slope, Qian Ruanhiko r 1 year old 1'5's 7'zo face tree' [P-(2) Perylene derivatives such as perylene anhydride and imyl-perylene 1 P-(3) Anthraquinone derivatives, anthanthrone derivatives, dibenzpyrenequinone derivatives 6 Pyrantrone derivatives, violanthrone derivatives, inviolanthrone 1 Anthraquinone-based or polycyclic quinone-based pigments such as derivatives [P-(4) Indigoid pigments such as indigo derivative 4 and thioindigo derivative 1 P-(5) Phthalocyanine-based pigments such as metal phthalocyanine and metal-free phthalocyanine p-(e) Perinone pigments such as bisbenzimitatur derivatives P-(7) Quinacridone pigments P-(8) Cyanine and merocyanine pigments P-(9
) Quinoline type 1 A Painter resin solution is used as a dispersant, and a coating liquid is obtained by dispersing an organic pigment in the Painter resin solution. Examples of the binder resin used here include polyethylene, polypropylene, acrylic resin,
Methacrylic resin, vinyl resin, epoxy resin, polyurethane resin, phenol resin, polyester resin, alkynd MA resin, polycarbonate resin, silicone resin, melamine resin, etc., polyaddition type resin, polycondensation type resin, and these Copolymer resins containing two or more of the repeating units of the resins mentioned above include, for example, hinyl chloride-vinyl acetate copolymer resins, hinyl chloride-vinyl acetate-maleic anhydride copolymer resins, and the like. However, the binder resin is not limited to these, and all resins commonly used for such purposes can be used.

Examples of the support include aluminium 1, nickel, copper, zinc, palladium, and insila 1.

A cylindrical shape made of metal such as tin, platinum, gold, iron, stainless steel, or brass is used.

Note that the cylindrical shape of the support means that as long as at least the body part is cylindrical, the shape of both ends is not particularly limited, and for example, a member of another shape may be attached to both ends or one end by means of fixing or fitting. A blank portion may be added.

By the manufacturing method of the present invention, a carrier generation layer containing a support (which may be provided with an undercoat layer) and a monolayer photosensitive layer is formed. An electrophotographic photoreceptor can be obtained, or an electrophotographic photoreceptor can also be obtained by forming a carrier transport layer on a carrier generation layer to provide a two-layered photosensitive layer.

The thickness of the carrier generation layer is 0.005 to 20 Ij. m is preferable, particularly preferably 0.1 to 5) bm, and the thickness of the carrier transport layer is preferably 0.5 to 50 ALm,
Particularly preferably 2 to 20 gn+.

When forming a carrier transport layer by the method of the present invention, the carrier transport substances used together with the Pine Goo resin are generally classified into electron donating substances and electron accepting substances.
It is appropriately selected from a large number of organic compounds. Specifically, the following compounds described in JP-A-57-67934 and the like can be used.

T-(1) Carbacil derivative T-(2) Pyrazoline derivative T-(3) Oxadiazole derivative T-(4) Triarylamine derivative T-(5) Stilbene derivative T-(8) Polyarylalkane derivative T- −('?)
Hydrazone derivative T-(8) Imidazole derivative T-(9) Triazole derivative T-(10) Phecolenediamine derivative T-(11)
) Rinitrofluorenone derivative T-(12) substituted chalcone derivative Next, Examples will be given to further clarify the present invention.

[Example 1] Monoazo face o'17 nail part and 1 part of polyethylene were pulverized and mixed in a ball mill, and the resulting coating solution was poured into a cylinder (l
Cylindrical shape with 0cmφ. ) was filled. Next,! A cylindrical aluminum support with a diameter of 8 cm was immersed in the coating solution in one cylinder.

The above coating liquid was also prepared in another tank, and was drawn out from the tank by a pump and applied to the cylinder described in iii+ (flow rate 25c+n/5ee). The press-injected coating solution rose through the gap between the cylinder and the support, and the relative movement of the coating solution and the sagging support exerted a shearing force in the longitudinal direction of the support surface. Next, paint! [Liquid 1 overflowed from the cylinder and was returned to the tank.

Next, the support was lifted out of the liquid with its axial direction substantially perpendicular to the liquid surface, and coating was performed.

The coated surface was then dried to form a carrier generation layer having a thickness of 371 m after drying.

As a result, the carrier generation layer had uniform IIQ and had the desired physical properties.

U Comparative Example 1] In Example 1, the support was immersed without pressure injecting the coating liquid from the bottom of the cylinder before coating, that is, before the support was pulled up, and then the support was pulled up. A carrier generation layer was formed in the same manner as in Example 1.

As a result, it was not possible to obtain 11Q with the desired physical properties.

As is clear from the above description, according to the present invention, the minute nk
It is possible to apply even a poorly stable liquid without causing aggregation, and it provides a coating layer with desired physical properties because it provides a dispersion coating liquid with uniform physical properties in the circumferential direction of the support. Furthermore, the liquid properties can be made uniform due to the chicken-tropic behavior peculiar to dispersion systems, but the liquid properties can be made uniform by the shearing force in the present invention, and furthermore, unlike conventional electrodeposition, it is not necessary. This has the effect of reducing coating equipment costs and increasing safety.

Patent applicant: Konishiroku Photo Industry Co., Ltd. Representative: Nobuaki Sakaguchi (and 1 other person)

Claims (1)

[Claims] In a method for producing a recording medium such as an electrophotographic photoreceptor, in which a cylindrical support is immersed in a coating solution prepared by dispersing a photosensitive material in a dispersant and then coated, at least 1) the support described in 11 is coated. A method for producing a recording medium such as an electrophotographic photoreceptor, which comprises first relatively moving the support and the coating in J& to apply a shearing force in the longitudinal direction of the surface of the support.