JPS58181054A - Electrophotographic receptor - Google Patents

Abstract

PURPOSE:To enhance electrophotographic characteristics, by using a resin layer contg. aluminum paste dispersed as an undercoat layer. CONSTITUTION:A resin layer contg. aluminum paste consisting of fine aluminum powder is used as an undercoat layer. An amt. of paste to be added to the resin is 5-50wt%. As the resin, alkyd, melamine, urethane, epoxy, polyester resins, etc. are embodied.

Description

[Detailed description of the invention] The present invention relates to an electrophotographic photoreceptor having an undercoat layer.

Electrophotographic photoreceptors basically consist of a substrate and a photosensitive layer. It is effective to provide an undercoat layer between the substrate and the photosensitive layer in order to prevent electrical breakdown of the photosensitive layer and to improve the ability to inject lactic acid from the substrate into the photosensitive layer.

The undercoat layer has conventionally been made of polyvinyl alcohol, polyvinyl methyl ether, poly-N-vinicy mesol, ethyl luulose, and methyl lullose.

Ethylene-acrylic acid copolymers, chiin, polyamide, etc. are known.

The first characteristic required of the undercoat layer is electrical properties.Since it is used for electrophotographic photoreceptors, it is superimposed that it does not affect the electrophotographic properties. It is necessary that the electrical resistance is 1
%, a charged potential is applied to the undercoat layer, and fogging occurs in the image as a so-called residual potential.

Furthermore, it is also necessary that the electrical resistance is not affected by changes in the external sgJ boundary, % or by changes in atmospheric humidity.

For example, if the electrical resistance increases due to low humidity, fogging will occur.

The undercoat layer is required to have such properties, but mono-II
Conventionally, it has been difficult to obtain good results when there is only a k layer.

Therefore, the present inventor focused on mixing a low-resistance substance into the resin of the undercoat layer, and completed the invention by using aluminum paste as the material with the best electrophotographic properties. Aluminum Paste Toha is a product made by grinding aluminum into a fine powder of less than a few degrees and improving its dispersibility to form a paste, so that a dispersion with metallic luster can be obtained.

In addition to this, carbon powder is also used as a low-resistance material.

Quaternary ammonium salts, ionic surfactants, copper powder 9, etc. may also be mentioned, but these are not preferred because they deteriorate the electrophotographic properties or change the properties of the undercoat layer.

The resin used for the undercoat layer is alkyd IIIW.
f1. Examples include melamine resin, urethane resin, epoxy resin, polyester resin, polyacrylic acid ester on the polyamide machine side, etc. This is because of the dispersibility of aluminum paste, and is used as a photosensitive layer coated on the undercoat layer. Any solvent may be used as long as it satisfies the solvent resistance to the solvent, and it does not meet the objective of the present invention. .

Any method can be used to disperse the aluminum paste in the resin, such as l-lumill, shaking bowl, roll mill, sand hawk mill, attritor, homogenizer, etc. * The thickness of the undercoat layer is Although it depends on the roughness of the six surfaces of the base, the amount of aluminum paste added, the resistance of the machine, etc., a root degree of 1 to 15 is preferable.

One can select *m based only on mechanical properties, ignoring the sublayer properties and electrical properties according to the present invention. Since the undercoat layer has Alki paste dispersed in it, it is possible to create a photoreceptor with stable characteristics that are not affected by changes in humidity. A photoconductive substance such as zinc oxide, cadmium sulfide, polyvinylcarbazole, 7-thalocyanine MN, and Asorinacea is formed into a paint together with a binder if necessary. In particular, when using an organic photoconductive substance, it is effective to create a functional am photosensitive layer consisting of a combination of a charge generation layer that generates charge carriers upon exposure to light, and a charge transport layer that has the luster of generating and transporting charge carriers. The charge generation layer is composed of Sudan Red, Guianpuru, Jenas Green 81, any azo pigment, algol yellow, pyrene quinone, indanthrene brilliant violet RRP, etc., quinocyanine #i, perylene pigment, indigo pigment, etc. Indigo pigments such as thioindigo toner, cyanine additives such as #-8117Ria cyanine, charge generating substances such as natalidone pigments, polyesters, polystyrene, polyvinyl chloride, etc. , polyvinyl acetate, acrylic, podavinylbutyral, I-rivinylvinylp
Lydon, Methyl Cell Prize, Hydroxypropyl Methyl
It is formed by being dispersed in a binder such as luulose or acrylates.

The charge generation layer is disposed above or below the charge transport layer, and
Its thickness #io, oi ~ 2 voices preferred Vio, 05 ~
It is one voice AM.

In addition, anthracene, pyrene, 7-enanthrene, aromatic compounds or indole, and JK pazole are added to the main chain or the chain of the transport layer.

Oresuzoles, isoxazoles, thiazoles.

idendazole, pyrazole, oxadiazole.

Compounds with nitrogen-containing cyclic compounds such as pyrazoline, thiadiazole, and triazole, and hole-transporting substances such as hydrazone compounds.It is formed by layer-forming resin with film-forming properties.This is generally a charge-transporting substance. This is because it has a low molecular weight and poor film-forming properties by itself. Examples of such resins include polycarbonate, polymethacrylic acid esters, polyacylate, polystyrene, polyester, polyvinylidene chloride, polysulfone 2, and the like.

The thickness of the charge transport layer is 5 to 20 degrees.

Example 1 Akvuru 411IFMlr (Product name: 7rivfyp
50 parts of toluene and 9 parts of aluminum paste were added to A351° Dainippon Inn Chuo Kagaku II) 5011 (parts by weight, same hereinafter) and dispersed in a ball mill for 5 hours. Add 1 curing agent (product name: Parnottuta D750) to this.
A polyurethane paint with a content of 20 parts (aluminum base) was prepared by adding 1 part of the solution.The solution was applied with a roll coater to an aluminum sheet with a thickness of 50 cm, and baked at 100°C for 20 minutes to dry. 10
It was attached at 100/100 using the 0 adhesion Hakurosuno Kuchi method with a 1% underlayer of voice thickness.

Next, electronic 4 genuine zinc oxide powder (Hakusui Chemical Exhibition) 5osi
t”-zbengali 0.211, hnyritene chloride-atarylonitrile copolymer (trade name: t-lan resin R200
0.5 parts (manufactured by Asahi Dow), 5 parts of tetrahydro-7ran, and 50 parts of hexabutane, and dispersed in a homogenizer for 20 minutes. This was suction-filtered to remove the shrimp, and thoroughly dried at 80°C to obtain dye-sensitized zinc oxide.

“60 parts of this zinc oxide and acrylic l1Jii (11 product name: Niacrypase CMZ-20, made by Genkasei Co., Ltd., solid content: 4
0%) and 45 parts of toluene were added, and the mixture was stirred for 4 hours and dispersed using l-lumil. The dispersion was coated on the undercoat layer to form a 22 μm thick photosensitive layer, and thoroughly dried at 80°C. Next, a protective layer of Atadal resin emulsion (@Product name Nearon HD-) having a weight average molecular weight of about 120,000 and a glass transition temperature of about 90°C was formed on top of this.The obtained sheet)
0 Kono photosensitive layer wrapped around a 136φ x 300-Ad cylinder and bound to a photosensitive drum? A f-5,5KV *Electrical, **m light, dry toner-11 Transfer to plain paper, then apply 1-1 hard [70" urethane rubber grade at an angle of 60°, pressure 1
It was used for a copy 111 that was cleaned by pressing the blade with a pressure of 0.00 yw.

When copying and viewing, very clear images were obtained, and similar copy images were obtained even under an environment of 10° C. and 15 SRH. For comparison, various photoreceptors were created. First of all, when we took an image of the photoreceptor without forming an undercoat layer and the entire surface was black, we found that it was not a normal image as there were countless white spots. .

Next, if a photoreceptor is prepared by applying a subbing layer paint without adding an aluminum base, fog will occur on the copying conductive surface and only a black color will be obtained. This occurs due to the residual potential of the undercoat layer.

Also, polyvinyl alcohol (WM product name: Denka Poval H-17, manufactured by Denki Kagaku Kogyo Co., Ltd.) water #! When a photoreceptor is created by applying turtle as an undercoat color layer.

Looking at the copy image, it appears that the image is correct.
Q This is because the resistance of the polyvinyl alcohol increases and a residual potential is generated in the low-humidity WHK.Also, 100 copies were made even in an environment that does not cause capri. Example 2: 30 parts of epoxy resin (product name: Ebicoat 10L11, manufactured by Neruka 9), Ki/Ren 7011S, 6 parts of aluminum paste, and 5 parts of aluminum paste were added. 61g of the mixture was passed through a Gap roll mill and dispersed therein to prepare 115g of Eboki/Ilt containing a curing agent (triethylene butramine), 5fi (Sl), El, T, and γ Lumi paste.

This 1-* Even if the photoconductor is manufactured in the same manner as in Example 1 by coating it as an undercoat layer in the same manner as in Example 1, it still remains a good copy 1.
1i! 8 people with 0 results who were able to obtain ikenP Canon Inc.

Claims (1)

[Claims] An electrophotographic photoreceptor having an undercoat layer and a photosensitive layer on a substrate, characterized in that the undercoat layer is a 1 m fat layer in which an Al-2-5 paste consisting of Al-1-Umum mold powder is dispersed. Photoreceptor.