JPH0587367B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a seamless resin belt that can be advantageously used, for example, as a substrate for a photoreceptor for a copying machine.

[Conventional technology]

Currently, drum-shaped and sheet-shaped photoconductors are used as photoconductors for copying machines. If it is in sheet form, wrap it around a drum or
Both ends are fused using ultrasonic waves, for example, to form a belt and used as a seam belt. However, all sheet-like materials have seams, and when used as a photoreceptor for a copying machine, these parts affect the copied image, so the seams are detected and used to avoid these parts. In addition, since the drum-shaped object has no seams, it can be exposed to light from any point to create a latent image, and once the latent image is erased after transfer, it can immediately move on to the process of creating the next latent image. . However, because of the cylindrical shape, there are restrictions on how to assemble parts installed around the photoreceptor, and when a copying machine is fixed to the base paper, its optical system becomes complicated. In this respect, a belt-shaped photoreceptor is better.

Therefore, if a seamless belt can be obtained, it becomes possible to obtain a photoreceptor that has both the advantages of a belt-like photoreceptor and those of a drum-like photoreceptor.

[Purpose of the invention]

An object of the present invention is to provide a method for manufacturing a seamless resin belt that can be advantageously used as such a photoreceptor substrate.

The purpose is to coat the surface of a seamless metal foil belt kept in a cylindrical shape with a resin or a solution of a resin intermediate, and then dry or cure after drying to form a resin film, and then remove the resin from the metal foil belt. A method of manufacturing a seamless resin belt by peeling off the resin film, which involves forming a release agent layer in advance on the surface of the metal foil belt, or adding a release agent layer to a solution of the resin or resin intermediate. This can be achieved by a method for manufacturing a seamless resin belt, which is characterized in that it contains an agent.

[Structure of the invention]

As the seamless metal foil belt used in the present invention, various known metal foil belts such as Ni, CO, and Al can be used.

In the present invention, since the resin film is peeled off from the metal foil belt by bending the metal foil belt inward as described later, the metal foil belt has enough strength to maintain its shape. Moreover, the typical film thickness is 10~
A material of about 1000μ is used.

When applying the resin or resin intermediate solution to the surface of the metal foil belt, the metal foil belt must be kept in a cylindrical shape. For example, as shown in FIG. 1, a rubber sheet 5 is fixed to a part of a rod 1 having an air flow passage, and the air supply and exhaust pipe 6 is passed from the air flow passage of the rod 1 into an annular groove. An example of this method is to supply compressed air to the metal foil belt 4 to inflate the rubber sheet portion and press it from inside the metal foil belt 7 to hold it in a cylindrical shape. When such a holding method is adopted, a space 8 is formed between the fixing part and the cylindrical foil, so when the space 8 is immersed in a solution of the resin or resin intermediate, the inside of the cylindrical foil is coated. In addition, since the holding rubber sheet does not come into contact with the coating solution, the coating process can be repeated repeatedly without any special cleaning of the holding rubber sheet.

At this time, a uniform resin film can be formed on the surface of the metal foil belt by lifting the metal foil belt from the dipping solution or by lowering the bath containing the dipping solution. The lifting speed or lowering speed is usually selected from the range of 10 to 100 cm/min.

As a solution of the resin or resin intermediate, imide resin such as polyimide, polyamideimide, polyetherimide, or polyethersulfone,
Resin such as polysulfone, or polyamic acid,
A resin intermediate such as photosensitive polyimide having an oxyethyl methacrylate group dissolved in a solvent such as dimethylformamide, dimethylacetamide, or N-methyl-2-pyrrolidone is used.
At that time, the concentration of the resin or resin intermediate varies depending on the thickness of the intended seamless resin belt, but is usually used in the range of 2 to 40% by weight.

When using a resin solution as described above, a resin film can be formed by applying it to the surface of the metal foil belt as described above and then drying it.
Further, when a solution of the resin intermediate as described above is used, a resin film can be formed by applying and drying and then curing by heating, exposure, etc. in accordance with a conventional method.

The thickness of the resin film formed by the method of the present invention can be appropriately selected depending on the concentration of solute in the coating solution, coating speed, etc.; It is best to choose from a range of degrees.

In the present invention, after forming a resin film on the surface of a metal foil belt as described above, the resin film is peeled off while bending the metal foil belt inward. At that time, in the present invention, in order to facilitate peeling,
Before applying the resin or resin intermediate solution, a solution containing a mold release agent is applied to the metal foil belt surface in advance, for example, in the same manner as the above-mentioned application of the resin or resin intermediate solution. Usually, a mold release agent layer with a thickness of about 0.1 to 1 μm is formed, or a mold release agent is contained in a solution of the resin or resin intermediate in an amount of about 0.01 to 5% by weight.

As the mold release agent, various known ones can be used, and for example, zinc, calcium, and magnesium salts of higher fatty acids such as stearic acid, dioctyl phosphate monoethanolamine salts, and the like can be suitably used.

〔Effect of the invention〕

By following the above method, a seamless resin belt can be easily obtained. If the seamless resin belt is made of a heat-resistant resin such as polyimide, the seamless resin belt can be advantageously used as a substrate for a photoreceptor for a copying machine by vapor depositing aluminum or the like on the surface to form a conductive layer. .

〔Example〕

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to the following Examples unless it exceeds the gist thereof.

Example 1 Using the holder shown in Figure 1, a 40 μ thick Ni foil belt (manufactured by Fukuda Metal Foil & Powder Industries Co., Ltd., diameter 85 mm x length 400 mm) held in a cylindrical shape was coated with 17% by weight polyimide. (Benzophenonetetracarboxylic dianhydride and 4,4-diisocyanodiphenylmethane, 2,
4-diisocyanotoluene copolymerization reaction product) and a mold release agent consisting of 0.4% by weight of dioctyl phosphate monoethanolamine salt (Sepal 441).
-100, and was immersed in a bath containing dimethylformamide solution (Chukyo Yushi Co., Ltd.).

Next, the solution bath was lowered at a speed of 30 cm/min to coat the surface of the Ni foil belt with polyimide.
Immediately after coating, the air in the rubber sheet was evacuated, the holder was removed, and the rubber sheet was introduced into a dryer that had been maintained at 80°C in advance. Then, the temperature was raised to 200℃ over 20 minutes,
The temperature was maintained for 10 minutes to form a dry resin film.

After cooling to room temperature, the resin film was peeled off while bending the Ni foil belt, and the thickness was approximately 40μ, diameter was 85mm, and length was 85mm.
A 350mm seamless resin belt was obtained.

Example 2 Using the holder shown in Fig. 1, a Ni foil belt similar to Example 1 was held in a cylindrical shape at 0.4% by weight.
``Separ'' 441-100 alcohol solution, lowered the solution bath at 20 cm/min, and air-dried.
A film with a thickness of 0.06μ was formed.

Next, it was immersed in a dimethylformamide solution containing 17% by weight of the same polyimide as in Example 1, and thereafter a polyimide film was formed in the same manner as in Example 1.

After cooling to room temperature, the polyimide film was peeled off while bending the Ni foil belt to form a sheet with a thickness of approximately 40 μm and a diameter of 85 mm.
A seamless resin belt with a length of 350 mm was obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of a holder for holding a seamless metal foil belt in a cylindrical shape, and the numbers in the figure indicate the following. 1: Rod, 2: Cylindrical bottom plate, 3: Cylindrical, 4:
Annular groove, 5: Rubber sheet, 6: Supply and exhaust pipe, 7:
Metal foil belt, 8: Lower space of the cylindrical body.

Claims (1)

[Claims] 1. After applying a resin or a resin intermediate solution to the surface of a seamless metal foil belt kept in a cylindrical shape, drying or curing after drying to form a resin film, and peeling the resin film from the metal foil belt. A method for producing a seamless resin belt by forming a mold release agent layer on the surface of the metal foil belt in advance, or by incorporating a mold release agent into a solution of the resin or resin intermediate. A method for manufacturing a seamless resin belt characterized by: