JPS60146238A - Manufacture of recording body of electrophotographic sensitive body or the like - Google Patents

Abstract

PURPOSE:To execute an immersing application even in case of a 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 tangential line direction of the circumferential surface of the supporting body. CONSTITUTION:A cylindrical supporting body is immersed into a 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 applying liquid are moved relatively, and a shearing force is exerted in the tangential line direction of the circumferential surface of the supporting body. It is also permissible that it is coated before the coating and this shearing force exerts at the time of the coating. As for a means for exerting the shearing force, there are methods such as 1. only the supporting body is rotated, 2. only the cylinder is rotated, 3. both the supporting body and the cylinder are rotated, 4. the coating liquid is pressed in forcibly, etc. The methods of 4 and 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 electronic q-photoconductor,
In particular, the present invention relates to a method for producing a recording medium such as an electrophotographic photoreceptor, which allows a coating film with uniform physical properties to be obtained using a dip coating method.

Conventionally, a method of manufacturing an electrophotographic photoreceptor by dipping 15 cylindrical supports in a coating liquid containing a photosensitive material and coating it is known as a dip coating method (Japanese Patent Laid-Open No. 49-1
(See Publication No. 30736, 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 a solvent, and dispersion-based coating solutions in which a photosensitive material is dispersed in an IBF agent. The invention yields to the technique of using the dispersion coating method of Gonagi.

When a dispersion coating liquid is used, there is a problem of agglomeration of the photosensitive material from the viewpoint of homogenizing the physical properties of coating 1 (I), especially coating 1.
1. When the viscosity of the material is low, there is a problem in that secondary aggregation occurs significantly. In order to solve this problem, countermeasures such as adding a dispersion stabilizer or increasing the viscosity (higher concentration) can be considered, but in the case of heavy-duty photoreceptors, the addition of a stabilizer has a negative effect on performance. This is unfavorable because of lI'+i, and there is also a problem that L-shift in concentration, that is, increase in viscosity, delays the coating speed, takes time for coating, and in some cases, the required film thickness cannot be achieved. .

In addition, there is no aggregation of the photosensitive material, and uniform coating is achieved.
In order to obtain the desired effect, an electrophoresis method was employed with the photoreceptor immersed, and the force u for electrodepositing the photosensitive material was
-88752) is also known, or according to this method, p (1 light per 1 gas/3
There is a problem with explosion-proofing, and if the explosion-proof measures are set to Nil,
The disadvantage is that the three systems cost a huge amount of money.

The uninvented [1] is that it is possible to dip coat I without causing agglomeration of the photosensitive material, even if the coating solution has poor stability.
It is an object of the present invention to provide a method for manufacturing a recording medium such as an electrophotographic photoreceptor that can perform Ij or IB).

Another +4 feature of the present invention is that the clothesline is placed on a cylindrical support.
This is a method for applying the coating 119 to a recording medium such as an electrophotographic photoreceptor, which is capable of coating (1+11).

Another object of the present invention is to provide a method for safely manufacturing recording bodies such as electrophotographic photoreceptors at low cost using Toshikin Coating 4J, which does not require electrodeposition.

The above-mentioned object of the present invention is to immerse a cylindrical support in a coating liquid R+I prepared by dissolving one material in a dispersant and then apply the same to the photosensitive material. In the method, at least before coating the support, the support and the coating solution are moved relative to each other, and a shearing force is applied in a substantially tangential direction to the circumferential surface of the support. Recording body manufacturing capacity J): Represented by;

Hereinafter, the method of the present invention will be explained in detail.

In the method of the present invention, a cylindrical support (hereinafter referred to as support) is referred to as one body. ) to paint r+i "ill" means to paint the support IH
! At night! This means that the contact between the body and the coating liquid remains in the immersion state without being released.

In the method of the present invention, the means for relatively moving the support and the coating liquid and applying a shearing force in a substantially tangential direction to the supporting circumferential blood include (1) a force that rotates only the support; , [2]
Methods include a method in which only the cylindrical cylinder is rotated, a method [3] in which both the support and the syringe are rotated, and a method [4] in which the coating liquid is forcibly introduced.

(In the method described in [1], for example, if the speed of the surface of the support ladle is 10 cm/see or more for 1-1 rotation time or 5 seconds or more for 1 degree, a desirable shearing force can be exerted. If the speed of the surface iI?i of the support body is less than 10 cm/sec, agglomeration of the photosensitive material may occur, which is not preferable. p
Applicable to coating liquids with a relatively low viscosity of less than
Rotate the motor at 6 rpm and refer to the measured value after 1 minute of rotation. ), when the viscosity is high, for example, 10,000 CpS, there is a problem that it does not aggregate or cannot be coated, so there is little scope for applying the method of the present invention. Therefore, the method of the present invention allows coating with relatively low viscosity! The target is 1j liquid.

The shearing force exerted by rotating the support as described in -1- has a vector approximately tangential to the circumferential surface of the support).
Its size is maximum at the surface of the support and decreases toward the cylinder.

In the method of J-, 1d(2), the cylinder rotation 1
117; The number and rotation 11 may be the same as the rotation speed and rotation time of the support 111 in the method described in [1].

The shearing force generated by the rotation of the syringe has a level approximately in the reading direction of the circumferential surface of the support, and its magnitude is small on the support surface, but the average shearing force applied to the entire coating liquid is 1iij. It is preferable that it is determined appropriately so that it is not much different from the method described in (1).

1-The power of one person [3] is the method of (1) and [2]
This method is a combination of the above methods, and it is preferable to rotate the support body and cylinder in opposite directions, but 1.
Even in the 1i1 direction, the rotation speed is different, and the difference is [l
] or [2] may be determined as appropriate so as to generate a shearing force comparable to the shearing force generated when the force is removed.

1. In the method described in [4], it is preferable to add 11+ liquid to Schilling-fnlI 1'Ii C at several points. )
Press it in (it is best to use a pump) from the shilling
It may be pulled out from the side (preferably between the user's position and the turning height (: r). In this case, it is best to press the application liquid in the tangential direction of the outer circumferential surface of the cylinder, so that it will spread around the support. Appropriate shearing force can be exerted in the approximately tangential direction of the surface. Note that this method [4] and methods (1) to [3] can also be combined.

In the method of the present invention, the above-mentioned shearing force is applied at least before coating the support, but "at least" here means that it is sufficient to apply the shearing force before coating. In addition to coating +iij, this shearing force may be applied during coating 1 [3].

The photosensitive material, support, coloring agent, etc. used in the present invention are not particularly limited, but for example, those listed below may be used.

As the photosensitive material, for example, an organic material 1 is used, and the above-mentioned material 1 is mentioned as a specific example.

P-(1) Azo pigments P-( such as monoamine pigments, bisuatsu pigments, trisane pigments, trisane pigments, boriazo pigments), metal complex azo pigments, pyrazolone pigments, styphlehenazine pigments, thianol azo pigments, etc. 2) Perylene series such as perylene butyranhydride and perylene imide 1) P-(3) Anne I laquinone derivative, anthantrone derivative, cypenespirene quinone derivative, pyrantrone 1
Anthraquinone-based or polycyclic boron-based pigments such as j^ conductors, violanthrone derivatives, and inviolanthrone derivatives P-(4) Indigoid pigments such as injo derivatives and thioindigo a^ conductors 1'' (5) Gold 1i 7 Yuo Cyanine , phthalocyanine pigments such as metal-free phthalocyanine P-(8) Perinone pigments such as hisbenzimidazole derivatives P-(7) Quinacrine pigments P-(a) Cyanine and merocyanine pigments P-(9
) Quinoline-based facial expression'1 A binder resin solution is used as a dispersant, and the organic pigment is added to the binder resin solution.
liquid is obtained. Examples of the paint resin used here include polyethylene, polypropylene, acrylic resin, methacrylic resin, vinyl acetate resin, epoxy resin, polyurethane resin, phenol resin, polyester resin, alkynd resin, polycarbonate resin, silicon, and silicone resin. , addition polymerization type resin of melamine resin T9, nail-like addition type resin, polycondensation type resin and repetition of these resins 4
Copolymer resin containing two or more of the 4 positions, for example 31
Examples include vinyl chloride-vinyl acetate-maleic anhydride copolymer resin and vinyl chloride-vinyl acetate-maleic anhydride copolymer resin. However, the Pine Goo resin is not limited to these, and all resins that are used in the first grade for such purposes can be used.

Examples of the supporting + and l+ bodies include aluminium 11, nickel, jll, zinc, palladium, silver, and indium.

Those formed into a cylindrical shape using metals such as tin, platinum, gold, iron, stainless steel, and brass are used.

Note that the cylindrical shape in the shape of the support body is not particularly limited to the shape of both ends as long as at least the body part I"1 is cylindrical. For example, the shape of the both ends is not particularly limited. Other shaped parts or parts may also be added.

According to the production method of the present invention, a carrier generating layer comprising a support (which may be provided with a coating layer), and an organic pigment is formed on a support, and a single photosensitive layer is provided on the support. An electrophotographic photoreceptor can be obtained, and an electrophotographic photoreceptor can also be obtained by forming a carrier transport layer on the first carrier generating layer and providing a two-layered photosensitive layer.

The thickness of the carrier generation layer is preferably 0.005 to 20 Bm, particularly preferably 01 to 5 gm, and the thickness of the carrier transport layer is preferably 0.5 to 50 gm.
Preferably 2 to 20 ALm per unit.

When forming a carrier transport layer by the method of the present invention, the carrier transport substances used together with the pinter 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 compounds described in JP-A-57-67934''f etc. can be used.

T-(1) Carbatur derivative 4 T-(2) Pyrazoline derivative T-(3) Oxacyazur derivative T-(4)) Realylamine derivative T-(5) Stilchen derivative 4 T-(f() Boriyalalkane 7.1 body T-(7)
Hydrazine derivative T-(8) Imidazole derivative T-(9) l-Ryasyl derivative T-(10) Phenylenediamine derivative T-(11) l
-Linitrofluorenone derivative T-(+2) substituted chalcone derivative Next, Examples will be given to further clarify the present invention.

[Example 1] 7 parts of Monoazoga material and 3 parts of polyethylene ffi 1
Part 1) was pulverized and mixed in a whole mill, and the resulting coating liquid was filled into a cylinder (cylindrical shape with a diameter of 10 cm). Next, a cylindrical aluminum support with a diameter of 8 cm was immersed in the coating liquid in the syringe, and the support was rotated at a rotation speed of 6 Orpm (peripheral speed 25 cm/5 ec). Rotation 11! f is 2
It was set to 0 seconds. At this time, the coating viscosity was 90 cps.

As a result, a good coating liquid was obtained without agglomeration of the mono-fine flakes 1 due to shearing force acting in the substantially tangential direction of the circumferential surface of the support.

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 3 g+n after drying.

As a result, the carrier generation layer has a j-gradient with the desired physical properties.
It was a model I.

[Comparative Example 1] In Example 1 described in Section 1, the support was immersed without rotating it before being pulled up, and then the support described in Section 1 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 a film with the desired physical properties.

As is clear from the above explanation, according to the present invention, even a liquid with poor dispersion stability can be coated without causing aggregation, and the dispersion coating liquid has uniform physical properties in the circumferential direction of the support. Therefore, it is possible to obtain a coating layer with the desired physical properties using RF (RF) technology, and the thixotropic behavior characteristic of dispersion systems tends to result in non-uniform physical properties. It can be applied uniformly, and furthermore, unlike conventional methods, it does not require external bonding, which has the effect of reducing IT costs and providing high safety.

! 1.11 Fraud Junjin Roku Konishi Photo Industry Co., Ltd. Agent
People Bury Earth Saka 11 Shin ll+' ((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 1+T solution prepared by dispersing a photosensitive material in a dispersant, and then coated, at least before coating the support. A method for producing a recording medium such as an electrophotographic photoreceptor, characterized in that the support and the coating IO liquid are moved relative to each other, and shearing force is moved in a substantially tangential direction of the circumferential surface of the support.