JPS589148A - Electrophotographic laminated photoreceptor - Google Patents

Abstract

PURPOSE:To enhance charge acceptance and charge retentivity, sensitivity, and adhesion, by using a polycondensation product of epichlorohydrine and bisphenol A as a resin for binding a charge transfer substance of a laminated photoreceptor. CONSTITUTION:A charge transfer substance is dispersed into a binder resin composed mainly of a polymer represented by the general formula in which n is 5-30 integer to form a charge transfer layer 3 on a charge generating layer 2 provided on a substrate 1. The binder resin used for the dispersant of the charge transfer substance may be said polymer alone or a cross-linked product obtained by reacting a cross-linking agent with said polymer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides chargeability, charge retention, Sensitivity, adhesion jlk
etc. &C regarding the improvement of excellent binder resins.

Traditionally, a laminated photoreceptor for electrophotography has a structure in which a charge-generating substance and a charge-transfer substance are laminated on a conductive support, either alone or dispersed in a binder resin.*411C% Charge Sawaki Sokki the mobile substance! The binder resin used when dispersing and laminating the material is transparent to light in the absorption wavelength range of the charge-generating material, and has good @II properties with the charge-transfer material. Therefore, it is necessary to provide high chargeability, high charge retention, and a strong adhesive image.

However, a binder that satisfies these conditions in a well-balanced manner*
m is small, for example, it has excellent electrical characteristics and is good (Usage-1) When using polycarbonate that binds and leaks, the temperature and atmosphere should be adjusted to JC11mL? It was not possible to obtain a laminated photoreceptor with sufficiently high sensitivity due to peeling from the geological layer or whitening due to crystallization.

In view of these circumstances, the object of the present invention is to provide a charge transfer material that is transparent from the visible region to the near infrared region and has good compatibility with charge transfer materials (high chargeability, high charge retention, strong adhesiveness, and high sensitivity). An object of the present invention is to provide a binder resin for the layer.

In general, the present invention can be carried out by increasing the degree of crosslinking of the desired polymer to 1k or by using a suitable crosslinking agent to adjust its hardness, This invention relates to a high-performance laminated photoreceptor for electrophotography, which is used as a binder resin for a charge transfer substance.

That is, to summarize the present invention, the present invention applies a charge generating substance alone or in a dispersed state on a substrate,
On the formed charge generation layer, a charge transfer substance is further added using the following formula 3: (wherein, n represents the number of S to 3G) in a binder resin whose main component is a polymer compound to be removed from the mold. What happens when it is dispersed and layered? This invention relates to a laminated photoreceptor for electrophotography, which is made of F# mold.

Hereinafter, the present invention will be described in detail based on Attachment III.
do.

The attached drawings are progressive diagrams schematically showing the structure of the laminated photoreceptor of the present invention.

ff1WK[, 1 is a substrate, 2 is a thin film of an inorganic or organic substance having photoconductivity. The formation method may be vapor deposition, coating, etc., and the photoconductive material may be used alone or dispersed. For example, vapor-deposited thin films of organic pigments or dyes such as selenium, antimony selenide, antimony selenide, selenium-tellurium alloys, silicon, metal-free p-cyanine, copper and its unbalanced esters, or mixtures thereof; Alternatively, a dispersion thin film prepared by dispersing the above-mentioned photoconductive substances, zinc oxide, cadmium sulfide, polyvinylcarbazole, mixtures thereof, etc. in a suitable binder resin can be used.

3 is a charge transfer layer in which a charge transfer substance is dispersed in the binder resin of the present invention. Examples of charge transfer materials include carbazole, N-ethylcarbazole, N-vinylcarbazole, N-isopropylcarbazole, N-phenylcarbazole, tetracene, chrysene, pyrene, perylene,
2-phenylnaphthalene, azapyrene, 2,3-benzochrysene, 3,4-benzopyrene, fluorene, 1,2
-benzofluorene, 2,3-benzofluorene, 4-
(2-fluorenylazo)resorcinol, 4-(2-
fluorenylazo)--cresol, 2-p-anine-
Ruaminofluorene, fluorenone, p-diethylaminoazobenzene, 1-(2-thiacylyIA-azo)-2
-naphthol, 4-aninol-amino-azobenzene,
N,N'--)methyl-p-phenylazo-aniline,
p-(dimethylamino)stilbene, 1,4-bis(2
-methylstyryl)benzey, 9-(4-cy:r-f-ruaminostyryl)anthracene, 2,5-bis(4-diethylaminophenyl) -1,! Examples include 1,4-oxadiazole, 1-pheny/I/-5-(p-ethylaminosf17,l/)-5-(p-dimethylaminopheny A-) biglin, and the like.

The binder resin serving as a dispersion medium for this charge transfer substance may be one in which the polymer compound represented by the above formula is used alone, or one in which the polymer compound is crosslinked by reacting with a crosslinking agent. It may be a product. Examples of suitable crosslinking agents include polyfunctionalized metals such as polyisocyanate F and polyamines.

The charge transfer layer 3 is made of Casteng, Doctor Plaid,
It is formed to a thickness of 5 μm to 50 μm using a coating method such as a wire bar or spin cord, and the mixing ratio of the charge transfer substance and the binder is 10 to 80 inches by weight, preferably 3
It is 0 to 60 Is.

The present invention will be explained below with reference to Examples, but the present invention is not limited thereto.

Example 1 Amorphous selenium was evaporated to a thickness of 0.3 μm on a conductive substrate 1 made of a thin aluminum plate (0.5 μm) under a vacuum of 10-A (tor, r ), and then 1-phenyl-5 -(p-
Diethylaminostyryl)-5-(p-diethylaminophenyl)-pizzoline 2f and a binder resin 2t made of a polymer compound represented by the above formula of the present invention were dispersed together with 10f dichloromethane in a ball mill for 2 hours. The resulting coating solution was applied onto the charge generation layer 2 using a doctor blade, and after drying, a laminated photoreceptor was obtained as a charge transfer layer 5 having a thickness of 10 μm.

Example 2 A coating solution obtained by dispersing 9f of 1st base copper phthalocyanine pigment and PA(A 200 (polyester AI resin manufactured by Toyobo Co., Ltd.) lf together with 500f of dichlorotetramethane in a ball mill for 2 hours was mixed with Lumirror (Toyobo Co., Ltd.)). A charge generation layer of about 1 μm was formed by coating on a polyethylene terephthalate (aluminum coated polyethylene terephthalate manufactured by So1f Co., Ltd.) and drying. A solution obtained by dispersing the used charge transfer substance 10f and binder resin 10F together with tetrahydrofuran 50f in the same manner as in Example 1 was applied with a wire bar and dried to form a charge transfer layer 5.

Example 3 Charge transfer layer solution 10 consisting of the same components and amounts as Example 2
0 parts by weight of incyanate, which is a crosslinking agent for the polymer compound, ie, coronae) L (Japan Polyurethane Co., Ltd.)
> was added, and after dispersion, it was coated on the same substrate 1 and charge generation layer 2 as in Example 2 in the same manner as in Example 2, and then heated at 80°C for 12 hours using a constant temperature bath. The charge transfer layer 3 was formed by crosslinking.

Comparative Examples 1~!Examples using a binder resin other than the present IA light under the same conditions as Example 1! I [show]

Comparative Example 1, vinyl chloride-vinyl acetate copolymer (+Tsuku C
Building Block Chemical) Comparison f @ 2, Polyester (Byron 2003 [Yobo) Comparative Example 311, Polycarbonate (Panlight Music University) These electrophotographic @ layer photoreceptors were subjected to static t\fi electric test lI
Using a k device (manufactured by Kawaguchi Ogosha 5P-428), the voltage was set at -6 KV, the corona gap was 10 mm, and the voltage was set for 31 minutes.
[The sample was charged in the dark at speed, and the amount of charge was measured after 2 seconds. In addition, in order to compare the charge retention properties, the time required for the amount of charge to decrease by half was measured as the dark life period. Further, under the same conditions as above, after 5 seconds of charging, the sample was exposed to light using a 2865 tungsten light source at an illuminance of 1 Ω lux, and the amount of light required to lower the potential immediately before exposure by sob was defined as the sensitivity. The results are shown in Table 1.

Table 1 In Table 1, a comparison between Example 1 and Comparative Examples 1 to S shows that the laminated photoreceptor of the present invention has a higher charge amount and charge retention than those using other binder resins. In addition to being excellent in all aspects of properties, sensitivity, and adhesion, the hardness Wi4]1 of the surface of the electroconductor due to the crosslinking agent can be easily achieved without significantly deteriorating the photoconductor characteristics.

As mentioned above, in 5th, the electrophotographic laminated photoreceptor of the present invention has high chargeability, high charge retention, high sensitivity, and strong adhesiveness,
Its application field is floor desks, and it can be effectively applied to copying machines, printers, printing plates, etc.

[Brief explanation of drawings]

The accompanying drawings are cross-sectional views schematically showing the structure of the laminated photoreceptor of the present invention. 1: Substrate 2: Charge generation layer C: Charge transfer layer Patent applicant Hiroshi Nakamoto, Japan IE Telephone and Telecommunications Corporation agent

Claims (1)

[Claims] A charge-generating substance is applied to a substrate, either singly or in a dispersed state, and a charge-transfer substance is further applied on the charge-generating layer, which is represented by the following formula: High molecular compound: Hs (in the formula, n represents a number from 5 to 3D) is dispersed in a binder resin as a main component, and is laminated with "t", which is a 4# characteristic for electrophotography. Laminated photoreceptor.