JPS62254157A - Production of electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To easily make a terminal treatment of a upper and/or a lower parts in the cylinderical substrate body by mounted a layer contg. a fluororesin on the upper and/or the lower parts of a cylindrical substrate body by coating, before mounting a photosensitive layer on the substrate body by coating. CONSTITUTION:The title body is formed by mounting the layer 2 contg. the fluororesin on the upper and/or the lower parts of the cylinderical substrate body 1 by coating, before mounting the photosensitive layer 3 on the substrate body 1 by coating. As the photosensitive layer 3 is mounted on the substrate body 1, after mounting the layer 2 contg. the fluororesin on the upper and/or the lower parts of the cylindrical substrate body 1 by coating, the photosensitive layer is not coated on a part of the layer 2 contg. the fluororesin, repelling the photosensitive layer, resulted in that the uniform surface layer is obtd. by merely coating the layer contg. the fluororesin. By the titled method, the production apparatus and its structure are simplified, as the coating film of the photosensitive layer 3 on the terminal parts of the cylindrical substrate body 1 is very easily removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The method of the present invention relates to a method for manufacturing an electrophotographic photoreceptor having at least a cylindrical support and a photosensitive layer, and particularly relates to terminal treatment of an electrophotographic photoreceptor.

Furthermore, the present invention relates to a method for producing an electrophotographic photoreceptor intended to improve the durability of non-image areas by coating the ends of a cylindrical support with a layer containing a fluororesin.

[Prior Art] Electrophotographic photoreceptors have various configurations in order to obtain predetermined characteristics or depending on the type of electrophotographic process to which they are applied.

As a typical electrophotographic photoreceptor, a photoreceptor having a photosensitive layer formed on a support, particularly a photoreceptor having a charge generation layer and a charge transport layer, is widely used. These photoreceptors are manufactured using the most common electrophotographic process.
That is, it is used for charging, image exposure, development, and, if necessary, image formation by transfer.

As a matter of course, electrophotographic photoreceptors are required to have predetermined sensitivity, electrical properties, and optical properties depending on the electrophotographic process to which they are applied.

However, not only that, but also the mechanical durability of the photoreceptor is an important property. Along with the durability of the photoreceptor, the support is also required to have durability.

The aluminum ram cylinder, which is generally used as a cylindrical support, is also in direct contact with the rollers used to support the cylindrical support, and due to long-term use, the aluminum of the cylindrical support is scraped and aluminum shavings are scattered. ,
Aluminum shavings adhered to the charger, photoreceptor, and developer, making it easy for leaks to occur during charging and development, and horizontal stripes often appeared on the image.

Another problem in manufacturing electrophotographic photoreceptors is that in conventional electrophotographic photoreceptors, the photosensitive layer is coated on the lower part of the cylindrical support, which causes unevenness at the edges due to pre-coating. Or, even when the edges are peeled off, the liquid splash from the solvent may reach the image area, and defects are likely to occur.

The method of dip coating in which the lower photosensitive layer is immersed in a solvent and peeled off with a rubber blade requires complicated equipment, as described in JP-A-60-97361 and JP-A-60-170858. However, since a solvent that dissolves the photosensitive layer is used, the photoreceptor may dissolve when the liquid splashes, causing defects even in the image area.

[Problems to be Solved by the Invention] An object of the method of the present invention is to provide a method for manufacturing an electrophotographic photoreceptor that facilitates terminal treatment of the upper and/or lower cylindrical support of the electrophotographic photoreceptor. It is. Yet another object is to provide a method for manufacturing highly durable cylindrical supports.

Means and Effects for Solving Problem E] In the method of the present invention, in the production of an electrophotographic photoreceptor having at least a cylindrical support and a photosensitive layer, the upper part of the cylindrical support and the The present invention is comprised of a method for producing an electrophotographic photoreceptor, characterized in that a layer containing a fluororesin is coated on the lower part of the electrophotographic photoreceptor.

According to the method of the present invention, the photosensitive layer is applied after the layer containing the fluororesin is coated on the upper and/or lower part of the cylindrical support, so the photosensitive layer is coated on the layer containing the fluororesin. Since it is repelled and not applied, a uniform surface layer can be obtained using only the layer containing the fluororesin.

With this method, it is very easy to remove the coating film of the photosensitive layer at the end of the cylindrical support, and the apparatus for this purpose can also be simple in structure.

Furthermore, by coating the cylindrical support with a layer containing a fluororesin, the abrasion resistance of the surface is improved and the durability against contact with the rollers supporting the cylindrical support is improved. .

The fluororesin used in the method of the present invention has a low surface tension with respect to water and organic solvents, and as a result, paint is repelled on the fluororesin and becomes difficult to coat. Furthermore, fluororesins have excellent heat resistance, insulation, arc resistance, and corona resistance, and can maintain these stable physical properties even under high temperature and high humidity conditions.

In particular, a layer containing a cured fluororesin has excellent wear resistance and is therefore effective in improving the durability of the cylindrical support.

Examples of the fluororesin used in the method of the present invention include polytetrafluoroethylene, polytrifluoroethylene, polyfluoroethylene-hexafluoropropylene copolymer, polychlorotrifluoroethylene, polyvinyl fluoride, and fluorine-based monomers such as ethylene, propylene, and styrene. Examples include copolymers with methacrylic acid esters, acrylic acid esters, etc., and they may also be used in combination with other types of paint resins.

The solvent may be any solvent that dissolves the fluororesin, such as toluene, xylene, benzene, methyl ethyl ketone, acetone, methanol, ethanol, and methyl cellosolve.

A layer containing a fluororesin is coated on the upper and/or lower part of the cylindrical support.

The thickness of the layer containing fluororesin is 0.05 after drying.
~5 g, m is preferred, and 0.1-3 ILm is optimal.

In the method of the present invention, the upper part on the cylindrical support and/or
Alternatively, a layer containing a fluororesin is coated on the lower part, and then a photosensitive layer is coated.

Application methods for the layer containing fluororesin include dipping,
It can be carried out by conventional methods such as roll coating, barcode coating, knife coating, play-decoating, and spray coating.

For example, a cylindrical support is immersed in a fluororesin solution using a dip coating method, and then pulled up at a certain speed for coating.
Heat and dry. When coating the upper part of the support, the cylindrical support is inverted and dipped in the fluororesin coating solution, and the coating is dried.

Furthermore, by coating the photosensitive layer on the cylindrical support, the photosensitive layer is repelled at the layer containing the fluororesin, and only the layer containing the fluororesin is exposed as a uniform surface layer. .

According to the method of the present invention, a uniform cylindrical support surface can be easily produced by processing the end portion of an electrophotographic photoreceptor with a layer containing a fluororesin.

Further, the method of the present invention can be applied to the end portion of an electrophotographic photoreceptor.

By processing with a layer containing a fluororesin, a cylindrical support that is resistant to wear can be manufactured.

The cylindrical support treated as described above may be made of any electrically conductive material.

For example, metal materials include aluminum, iron, copper, stainless steel, and the like.

Also used is a conductive plastic in which conductive particles are mixed into a plastic material. Examples of the conductive particles include conductive carbon particles, tin oxide particles, titanium oxide particles, and zinc oxide particles.

The cylindrical support has an outer diameter of 20 mm to 500 mm and is hollow, and can be open at both ends, open at one side, or closed at both ends.

Next, an electrophotographic photoreceptor manufactured by coating will be described.

The photosensitive layer consists of CdS, CdSe, Se, and dye-sensitized Z.
Inorganic photoconductive powder such as nO, polyvinyl carbazole,
An organic photoconductive substance such as pyrazoline, oxadiazole, or phthalocyanine is dispersed and applied, if necessary, along with a binder resin.

Organic photoconductive materials have higher productivity compared to inorganic photoconductive materials.
Although it has advantages such as low cost, it has poor sensitivity, so an effective way to improve it is to use it as a functionally separated photosensitive layer in which a charge generation layer and a charge transport layer are laminated.

The charge generation layer includes azo pigments such as Sudan Red, Guianpuru, and Jenas Green B, disazo pigments, quinone pigments such as Algol Yellow and pyrene quinone, indigo pigments such as quinocyanine pigments, perylene pigments, indigo and thioindigo, and Indofast Orange toner. Charge-generating substances such as bisbenzimidazole pigments, phthalocyanine pigments such as copper phthalocyanine, and quinacridone pigments are dispersed in binder resins such as polyester, polyvinyl acetate, acrylic resin, polyvinylpyrrolidone, methylcellulose, hydroxypropylmethylcellulose, and polyvinyl butyral. and coated on the support.

The charge transport layer contains a polycyclic aromatic compound such as anthracene, pyrene, phenanthrene, coronene, etc. in the main chain or side chain.
Compounds with nitrogen-containing ring structures such as indole, carbazole, oxazole, isoxazole, thiazole, imidazole, pyrazole, oxadiazole, pyrazoline, thiadiazole, and doriapool, and charge transporting substances such as hydrazone compounds have film-forming properties. It is applied by dissolving it in resin. This is because the charge transporting substance generally has a low molecular weight and has poor film-forming properties by itself. Film-forming resins include polyester, polysulfone,
Examples include polycarbonate, polymethacrylic acid esters, polystyrene, styrene-acrylonitrile copolymer, styrene-methacrylic acid ester copolymer, and the like, which may be used alone or in combination.

In addition, between the support and the photosensitive layer, it is possible to improve the adhesion between the photosensitive layer and the support, improve the coatability of the photosensitive layer, cover defects on the support,
An undercoat layer may be provided to protect the photosensitive layer from electrical breakdown and to improve carrier injection properties of the photosensitive layer.

Materials for this undercoat layer include polyurethane, nylon,
Examples include polyvinyl alcohol, epoxy resin, polyamide, polyester, polyvinyl acetate, ethylene-vinyl acetate copolymer, casein, gelatin, phenolic resin, cellulose acetate, and nitricellulose.

In addition, an insulating layer consisting of a single or multiple resin layers on top of the photosensitive layer can be used to protect the photosensitive layer, improve the mechanical strength of the photoreceptor, improve the dark decay properties or be applied in certain electrophotographic processes. Layers 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, and polyvinyl butyral, epoxy resins, polyurethane, and alkyd resins. , thermosetting resins such as melamine resin, cyclized butadiene rubber, and photocuring resins such as epoxy acrylate, polyester acrylate, urethane acrylate, and unsaturated polyester.

The method of the present invention can remove the photosensitive layer, undercoat layer, and insulating layer of the fluororesin-containing layer in any layer process. can be obtained at the ends on a shaped support.

Here, one example of an electrophotographic photoreceptor manufactured by the method of the present invention will be explained with reference to the drawings.

FIG. 1 is a cross-sectional view showing a layer containing a fluororesin coated on a single-layer type photoreceptor, and FIG. FIG.

Reference numeral 1 indicates a cylindrical support, 2 a layer containing a fluororesin, 3 a photosensitive layer, 4 a charge generation layer, and 5 a charge transport layer.

Note that the undercoat layer, insulating layer, etc. are not coated in the example shown in this drawing.

[Example] Example 1 110 parts (parts by weight, same hereinafter) of fluororesin (trade name Lumiflon LF-20O8 manufactured by Asahi Glass) were mixed with 100 parts of xylene.
A fluororesin liquid was obtained.

Using this solution as a coating liquid, 10 mm of the lower end of a 60 mmφ x 260 mm aluminum cylinder was immersed for 10 minutes.
Pull up at a speed of 0 mm/min, apply, and heat at 150℃30
After drying by heating for 10 minutes, a layer containing a fluororesin having a thickness of 1.07 parts and m was coated.

Next, reverse the cylinder and operate the upper end 1
A fluororesin liquid was applied to a thickness of 0 mm, dried, and a layer containing a fluororesin was applied.

Next, copolymerized nylon resin (trade name Amilan CM800)
0, manufactured by Toshi Corporation) 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 the treated aluminum cylinder by a dipping method.

At this time, dip the cylinder up to a point 7 mm from the top and apply to the area below that.

After dipping, the coating was pulled up at a speed of 100 mm for 7 minutes, and dried by heating at 80° C. to form a subbing layer of 0.5 g and m thickness.

Next, 10 parts of a disazo pigment having the following structure, 6 parts of cellulose vinegar forge butyrate resin (trade name CAD-381, manufactured by Eastman Chemical Company), and 60 parts of cyclohexanone were dispersed in a sand mill for 20 hours. In this dispersion,
7100 parts of methyl ethyl keto was added to prepare a coating solution for a charge generation layer.

The drum coated with the undercoat layer was immersed in the coating solution up to a distance of 7 mm from the upper end.

After dipping, pull up at a speed of 110 mm/min and apply.
After drying at 00°C, a charge generation layer with a thickness of 0.2 JLm was applied.

Next, a hydrazone compound having the following structure was added to a polystyrene resin (trade name Dialex HF-
55, manufactured by Mitsubishi Monsanto Chemicals) 10 parts to 80 parts of toluene
A coating liquid for the charge transport layer was prepared by dissolving the mixture in the following parts.

The drum coated up to the charge generation layer was dipped in this coating solution up to a point 7 mm from the top of the drum, and after dipping, 1
The coating was carried out by pulling up at a speed of 0.00 mm/min. It was heated and dried at 100° C. for 60 minutes, and a charge transport layer was applied thereon to produce an electrophotographic photoreceptor.

Both ends of this electrophotographic photoreceptor are covered with a uniform layer containing a fluororesin, and a subbing layer, a charge generation layer, and a charge transport layer are attached to the layer containing a fluororesin. There wasn't any.

When this electrophotographic photoreceptor was attached to a copying machine (product name PC-20, manufactured by Canon ■) and the image was viewed, it was found that 10,000
Uniform images were obtained up to zero.

Even after copying 10,000 copies, no scratches were observed on the silicone resin-containing layer of the cylindrical support.

Example 2 Polytetrafluoroethylene particles (trade name Lubron L-
2, manufactured by Daikin ■) was dispersed in 100 parts of xylene to obtain a fluororesin liquid.

Using this solution as a coating liquid, 10 mm of the lower end of a 60 mmφ x 260 mm aluminum cylinder was immersed for 10 minutes.
Pull up at a speed of 0 mm/min, apply, and apply at 300°C.
3. Heat and dry for 0 minutes. A layer containing a fluororesin having a thickness of OILm was applied.

Further, the aluminum cylinder was turned upside down, and a fluororesin liquid was applied to 10 mm of the upper end by the same operation, and dried to coat a layer containing a fluororesin.

Next, dibromanthanthrone (trade name Monolite Red 2Y, C, 1, No. 59300, manufactured by ICI) was added for 3
1 part, 10 parts of the hydrazone compound used in Example 1, and 10 parts of polycarbonate (trade name Panrai L-1250, manufactured by Yojin Kasei) were dissolved in 90 parts of 1,2-dichloroethane, and dispersed in a ball mill for 20 hours. This was used as a photosensitive solution.

The cylinder coated with the fluororesin-containing layer was immersed in this solution up to a point 7 mm from the -L end.
m m Pull up and apply at a speed of 7 minutes, 100℃,
After heating and drying for 60 minutes, a 15 gm photosensitive layer was applied.

Both ends of the electrophotographic photoreceptor produced in this manner were covered with a uniform fluororesin-containing layer, and no photosensitive layer was attached to the fluororesin-containing layer.

When this electrophotographic photoreceptor was attached to a copying machine (product name PC-20, manufactured by Canon) and the image was viewed, it was found to be 10.0
Even after copying 10,000 copies, the layer containing the fluororesin of the cylindrical support has a uniform image.
No injuries were observed.

Comparative Example 1 A subbing layer, a charge generation layer, and a charge transport layer were coated on an aluminum cylinder of 60 mmφ x 260 mm in the same manner as in Example 1, except that the layer containing the fluororesin was not coated.

This electrophotographic photoreceptor has an uneven film thickness at the bottom end due to blurring of the charge transport layer.
C-20 (manufactured by Canon), and when looking at the images, an uneven and non-uniform image was obtained due to the wobbling of the rotation of the cylinder.

Comparative Example 2 The same procedure as in Example 1 was carried out except that the layer containing the fluororesin was not coated, and the thickness was 60 mmφ x 260 m.
After applying a subbing layer and a charge generation layer to an aluminum cylinder of 100 m, and applying a charge transport layer, the lower end of the drum is 10 m long.
m was peeled off with a blade.

When this electrophotographic photoreceptor was attached to a copying machine (trade name PC-20, manufactured by Canon ■) and 10,000 copies were repeatedly made, the aluminum cylinder was
It was scraped off to a depth of m, and an image was obtained in which leakage occurred due to aluminum scum in the developing device, and horizontal streak-like self-cutting occurred on the image.

[Effects of the Invention] The method of the present invention coats the fluororesin-containing layer on the end of a cylindrical support. The photosensitive layer is repelled and a uniform surface layer of the fluororesin-containing layer can be obtained.

Therefore, it is possible to manufacture electrophotographic photoreceptors with high precision, and by processing the ends of the cylindrical support with a layer containing a fluororesin, the cylindrical support is significantly more durable than aluminum supports. A shaped support can be provided.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a state in which a layer containing a fluororesin is coated on a single-layer type photoreceptor, and FIG. FIG. Reference numeral 1 indicates a cylindrical support, 2 indicates a layer containing a fluororesin, 3 indicates a photosensitive layer, 4 indicates a charge generation layer, and 5 indicates a charge transport layer.

Claims (2)

[Claims] (1) In the production of an electrophotographic photoreceptor having at least a cylindrical support and a photosensitive layer, before coating the photosensitive layer,
A method for producing an electrophotographic photoreceptor, which comprises coating the upper and/or lower part of the cylindrical support with a layer containing a fluororesin. (2) The method for producing an electrophotographic photoreceptor according to claim 1, wherein the photosensitive layer comprises a charge generation layer and a charge transport layer.