JPH049311B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to a photosensitive member (for example, an electrophotographic photosensitive member) in which a photosensitive layer, particularly an organic photoconductor layer, is formed by coating on a cylindrical hollow substrate having an open portion. The present invention relates to an image holding member such as an electrophotographic photoreceptor having an integral structure of an open part support member.

Electrophotographic copying machines generally use a process in which a cylindrical photoreceptor is rotated while applying electrical charge to the photoreceptor, a process in which an electrostatic charge image is formed by imagewise exposure, and a process in which an electrostatic charge image is visualized by development. In addition, processes such as a process of transferring a formed image to a transfer medium such as paper are added. In some of these processes, a cylindrical hollow substrate is used to prevent the surface of the cylindrical photoreceptor from being pressed and bent by a process member (for example, a blade cleaning member). An opening support member called a ``flange'' is disposed in the opening.

In the conventional method, a flange placed in the open part of a cylindrical hollow base was integrated with the base using a joining means such as screws, but this complicated the manufacturing process and required electrophotography. Small copy machine
There was a problem that made it unsuitable for weight reduction.

Therefore, the inventor of the present invention tried a method of integrating the flange and the base with an adhesive through experiments, but the organic solvent, which is a volatile component remaining in the adhesive after adhesion and solidification, had a negative effect on the electrophotographic properties. It turned out to give. In particular, it has been found that among the electrophotographic characteristics, a decrease in sensitivity, an increase in residual potential, and fatigue due to repeated use are significant, which impede normal image formation. In addition, if an electrophotographic photoreceptor whose flange and substrate are bonded and solidified with an adhesive containing volatile components is stored in a protective bag, trace amounts of volatile components in the bonded and solidified adhesive may be stored. was filling the protective bag, which had a negative effect on the photosensitive layer.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image holding member that eliminates the above-mentioned drawbacks.

Another object of the present invention is to provide an electrophotographic photoreceptor that prevents a decrease in sensitivity in electrophotographic properties during storage, an increase in residual potential, and fatigue during repeated use.

The object of the present invention is to provide a photosensitive member having a photosensitive layer formed by coating a dispersion containing an organic photoconductive substance on a cylindrical hollow substrate with at least one side open, and a support disposed in the open portion of the substrate. This is achieved by an image holding member characterized in that the members are bonded together using a non-solvent adhesive to form an integral structure.

A plastic flange is suitable as the flange. This is not only lightweight, but
This is because it is easy to bond, easy to mass produce, and even some errors can be compensated for by being neat. At this time, the plastic materials include phenolic resin, amino resin, polyester resin, allyl resin, epoxy resin, polystyrene, ABS.
Resin, acrylic resin, PVC resin, polyamide, polyimide, polycarbonate, polyacetal,
Polyphenylene oxide, polyethylene terephthalate, polybutylene terephthalate, polyarylate, polysulfone, polyethersulfone, etc. can be used, and a circular plate is suitable as the shape.

The non-solvent adhesive is preferably a combination of a liquid viscous resin (viscous liquid at room temperature) and a hardening agent, and specifically alpha cyanoacrylate adhesives and epoxy adhesives are preferred. . Alpha cyanoacrylate adhesive (base adhesive:
Methyl-α-cyanoacrylate, Ethyl-α-
As the liquid viscous resin (such as cyanoacrylate), "Aron Alpha" manufactured by Toagosei Kagaku Co., Ltd. and "Eastman 910" manufactured by Eastman Kodatsu Co., Ltd. can be used. Moisture in the air can be used as a hardening agent for this adhesive. In addition, as an epoxy adhesive, bisphenol A, which is a liquid viscous resin, is used.
Type epoxy resin and curing agent can be used, specifically "Epicoat 815", "Epicoat 827", "Epicoat 828", "Epicoat 828", "Epicoat" manufactured by Ciel Chemical Co., Ltd.
832'' and ``Epicote 834'', ``Araldite GY252'', ``Araldite GY250'' and ``Araldite GY260'' manufactured by Ciba, and ``DER330'' and ``DE'' manufactured by Dow Chemical International.
Commercially available products such as "R.331" and "DER332" can be used, and as curing agents, diethylenetriamine, triethylenetetramine, diethylaminopropylamine, N-aminoethylpiperazine, benzyldimethylamine, tris-(dimethylaminomethyl) Amine curing agents such as phenol, metaphenylene diamine, diaminodiphenylmethane, diaminodiphenyl sulfone can be used. This amine curing agent is 5% to 35% by weight based on the base bisphenol A epoxy resin.
It can be contained in a proportion of .

Next, the present invention will be explained with reference to the drawings. FIG. 1 is a perspective view showing how a cylindrical hollow base 1 (hereinafter referred to as base 1) and a flange 3 are joined. A photosensitive layer 2 formed by coating is on the surface of the substrate 1.
(e.g. organic photoconductor layer, zinc oxide-binder layer, cadmium sulfide-binder layer, etc.). The flange 3 has a hole 4 through which the shaft passes and a stepped portion 5 that matches the inner diameter of the base body 1. A non-solvent adhesive is applied using the stepped portion 5 as an application area, and the base body 1 and the flange 3 are bonded. The adhesive may be applied over the entire surface of the stepped portion 5, or may be applied intermittently at only a few points.

The base body 11 may be a cylindrical hollow body with both ends open, or as shown in FIG. 2, one end (upper end) is closed, a protrusion 7 is formed in the center, and the other end (lower end) is open. A cylindrical hollow body 6 may also be used. In this case, the flange is of course attached to the open part.

As explained above, the electrophotographic photoreceptor of the present invention, in which a plastic flange is bonded using a non-solvent adhesive that does not contain a volatile organic solvent, does not change the characteristics of the organic photoconductor layer. , can provide stable images.

Example 1 As a base, the upper end is closed as shown in FIG.
A 60φ x 260mm aluminum cylinder was prepared with a protrusion 7 formed in the center and an open bottom end. The wall thickness was 0.5mm.

Nylon resin (product name: Alamin CM-8000,
manufactured by Toray Industries) 10 parts (by weight, the same applies hereinafter) and 8-
10 parts of nylon resin (trade name: Torezin EF30T, manufactured by Teikoku Kagaku) was dissolved in 50 parts of methanol heated to 50°C. After cooling to room temperature, a mixed solution of equal amounts of methanol and toluene was added to adjust the temperature to 5 m·Pa·S.

This can be used as a paint, for example, in Utility Application No. 58-144047.
It was coated onto the substrate to a thickness of 0.5 μm using a (dip) coating device as disclosed in No.

Next, add 10 parts of the disazo pigment with the following structural formula. Cellulose acetate butyrate resin (product name: CAB-
381 (manufactured by Eastman Chemical) and 60 parts of cyclohexanone were dispersed for 20 hours in a sand mill apparatus using 1φ glass beads. Add 100 parts of methyl ethyl ketone to this dispersion, dip coat it on the undercoat layer, heat dry at 100°C for 10 minutes,
A charge generating layer was applied with a coverage of g/m ² .

Next, add 10 parts of the hydrazone processed product with the following structural formula. and 12 parts of styrene-methyl methacrylate copolymer resin (trade name: MS-200, manufactured by Nippon Steel Chemical Co., Ltd.) were dissolved in 70 parts of toluene, coated on the charge generation layer, and dried at 100°C for 60 minutes. A charge transport layer having a thickness of 16 μm was formed.

In the manner described above, an organic photoconductor layer was formed on the substrate. Then, a polycarbonate flange was adhered to the base and the open portion using an alpha cyanoacrylate adhesive (trade name: Aron Alpha, manufactured by Toagosei Chemical Co., Ltd.).

The electrophotographic photoreceptor produced in this way was
The whole book was stored in an airtight container made of PVC for two months. When the electrophotographic photoreceptor was attached to an electronic copying machine (product name: PC10, manufactured by Canon) and the copied image was viewed, the image quality was normal.

On the other hand, when adhering the flanges, a synthetic rubber adhesive (trade name: High Contact, manufactured by Cemedine) containing ethyl acetate, n-hexane, etc. was used, and the samples were stored in the same manner for comparison. When I looked at the image, I noticed that fog had occurred, and it was necessary to readjust the density adjustment. This was due to a decrease in sensitivity due to the effect of the solvent.

Example 2 In place of the adhesive used in Example 1, "Cemedine Super" adhesive manufactured by Cemedine, which uses bisphenol A type epoxy resin as the main ingredient, was used, but in the same manner as in Example 1. After preparing the electrophotographic photoreceptor, similar tests were conducted, and the same results as in Example 1 were obtained.

On the other hand, as a comparative test, instead of the adhesive used in Example 2, phenol novolac type epoxy resin (Pc-401 manufactured by Haben Chemical Carbon Co., Ltd.), triethylenetetraamine and cellosol acetate (organic solvent) were used. An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that an adhesive containing An increase was observed.

Furthermore, in the present invention, in addition to the photosensitive layer used in the above-mentioned embodiments, phthalocyanines such as copper phthalocyanine and AlCl ₃ phthalocyanine, JP-A-55-82160, U.S. Pat. No. 4,356,243, and U.S. Pat.
No. 4359513, US Patent No. 4359515, US Patent No. 4390611, US Patent No. 4399206, US Patent No. 4418133, US Patent No.
A charge generation layer formed by dispersing a disazo pigment, a trisazo pigment, etc. disclosed in Japanese Patent No. 4427753, etc. in a binder, and US Pat. No. 4315982, US Pat. No. 4391889, US Pat. No. 4399208, US Pat. Publication No. 4399207, U.S. Patent No.
A photosensitive layer provided with a charge transport layer as disclosed in Japanese Patent No. 4413045, US Pat. No. 4410548, etc. can be used. In this case, the charge generation layer can have a film thickness of about 0.01 to 10μ, and the charge transport layer can have a film thickness of about 1 to 50μ (after drying).

Further, between the photosensitive layer and the cylindrical hollow substrate, for example, casein, polyvinyl alcohol, nitrocellulose, ethylene-acrylic acid copolymer, polyamide, (nylon 6, nylon 66, nylon 610, copolymerized nylon, alkoxymethylated nylon, etc.) A subbing layer of polyurethane, gelatin, aluminum oxide, etc. can be provided.

The thickness of the undercoat layer is 0.1 micron to 5 micron.
Preferably, 0.5 micron to 3 micron is appropriate. In addition to aluminum, metals such as copper and stainless steel, plastics, and paper can be used as the cylindrical hollow substrate. When the cylindrical hollow substrate is made of an insulator such as plastic or paper, it is desirable to provide a conductive layer such as an aluminum vapor deposition layer, a conductive resin layer, or a conductive particle-binder layer on the surface.

[Brief explanation of drawings]

1 and 2 are perspective views showing embodiments of the image holding member of the present invention. 1, 6; cylindrical hollow substrate; 2; photosensitive layer; 3; flange; 4; hole; 5; stepped portion; 7; protrusion.

Claims (1)

[Scope of Claims] 1. A photosensitive member having a photosensitive layer formed by coating a dispersion containing an organic photoconductive substance on a cylindrical hollow substrate with at least one side open, and a support disposed in the open portion of the substrate. An image holding member characterized in that the members are bonded together using a non-solvent adhesive to form an integral structure. 2. The image holding member according to claim 1, wherein the non-solvent adhesive is an adhesive containing a liquid viscous resin and a curing agent. 3. The image holding member according to claim 2, wherein the liquid viscous resin is an alpha cyanoacrylate resin or a bisphenol A type epoxy resin. 4. The image holding member according to claim 1, wherein the cylindrical hollow base is an aluminum cylinder. 5. An image holding member according to claim 1, wherein said supporting member is a circular plate made of plastic.