JPS6348562A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To obtain the titled body having an improved sticking property against a substrate body, without reducing the electrophotographic characteristics by interposing a layer contg. a silane coupling material between an org. photoconductive substance and a transparent conductive substance. CONSTITUTION:An electric charge generating layer and an electric charge transfer layer are formed by effecting a gravure of the silane coupling material on one surface of the transparent conductive substance mounted on a substrate body, followed by drying it with a hot air, an subsequently, by coating the transparent conductive layer with the org. photoconductive substance, namely the electrophotographic sensitive material. Thus, the titled body which has improved sticking property against the substrate, and does not hardly reduce photosensitivity is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrophotographic photoreceptor that has excellent adhesion to a conductive support without reducing dark resistance and photosensitivity.

[Conventional technology]

Conventionally, many materials are known as inorganic and organic photoconductive materials as electrophotographic photoreceptor materials.

Photoconductors such as zinc oxide, selenium, or cadmium sulfide have excellent properties in terms of photosensitivity, but have problems in transparency, lightness, flexibility, and pollution resistance.

On the other hand, organic photoconductive materials, compared to inorganic materials,
A large number of substances are known, and examples of low-molecular organic photoconductive substances include 4-fucrocyanine, metal-free phthalonanine, oxadiazole derivatives, benzimidazole L-conductor, etc. In addition, as a polymer type organic photoconductive material, for example, Japanese Patent Publication No. 42-1867
Publication No. 4.

Polymers containing polycyclic rings such as carbazole rings or polynuclear aromatic rings such as naphthalene rings and anthracene rings are known, as disclosed in Japanese Patent Publication No. 42-25230.

[Problem to be solved by the invention]

These organic photoconductive materials have excellent properties such as occupancy, lightness, and non-polluting properties as organic materials, but they have significantly lower photosensitivity than inorganic materials, and they also have poor physical properties. There are many points that need to be improved, so the current EI is ``1''.
Compared to inorganic photoconductive materials, it was inferior in practicality.

Regarding the former, photosensitivity, advances in organic synthesis technology have led to the disclosure of useful organic photoconductive substances and sensitizers, and their practical value has increased dramatically.
There are many problems regarding the physical properties of the latter, which poses a major obstacle to the practical application of organic photoconductive materials. For example, polymer-type organic photoconductive@method materials have molecules rI! It has a strong J cohesive force, often causes crystallization and impairs transparency, is generally hard and brittle, and has drawbacks such as poor adhesion to a support. For low-molecular-weight organic photoconductive substances, vapor deposition or dispersion or dissolution in a resin is used as a method of forming a photosensitive layer, but in the case of vapor deposition,
There are problems with flexibility and adhesion with the support, as well as efficiency and cost during photosensitive layer formation, and when dispersing or dissolving rJ[Il This is mostly determined by the properties of the resin that is the binder, but the resins currently used cannot be said to have sufficient flexibility or adhesion to the support, and even if these properties are good, However, it has been accompanied by effects that impair desired electrophotographic properties, such as a decrease in surface potential and a decrease in photosensitivity, and thus has not been able to provide satisfactory results.

The present invention is intended to solve the above-mentioned problems, and its purpose is to provide an electrophotographic photoreceptor that has excellent adhesion to a support without degrading electrophotographic properties. There it is.

[Means for solving problems]

The present invention provides an electrophotographic photoreceptor comprising an organic photoconductive material, a transparent conductive material, and a 6-light support, in which a layer of a silane coupling material is provided between the organic photoconductive material and the 6-light conductive material. It is characterized by the formation of

〔Example〕

Polyester film (high beam 100
LBKO2, Toshi) is used as a support for an electrophotographic photoreceptor.

A silane coupling agent is gravure printed on the ITo support. Gravure roll version costs 150-20. Jl
The silane coupling agent has a diameter of 50 to 1
00/J m dots are printed on the To.

The transferred silane coupling agent is dried with hot air, and then an organic photoconductive substance, that is, an electrophotographic photosensitive material is applied.

The photographic material 'A' was prepared as follows. Copper phthalocyanine (Sumitone, Oyanine
BlueLBGN, Sumitomo Chemical) 3r11 polyester resin (Byron 200. Toyobo), 22° polyisocyanate (Hijisha Polyurethane), methyl ethyl ketone (hereinafter referred to as MFiK)/toluene (=1/1) 70P
were mixed and dispersed in a ball mill for 24 hours, and this was used as liquid A.

Also, polycarbonate) (NOV ARE
, Mitsubishi Kasei)27. Zinenylhydrazone conductor (CT
C! -256, General Perfume Sangyo) 22 was dissolved in 10y of tetrahydrofuran (hereinafter referred to as THF), and this was used as liquid B.

The above-mentioned silane coupling agent was printed on the surface of the support by applying liquid A using a coater, and drying with hot air to a thickness of about 1 μm.
O) Create a 'wL charge generation layer. Furthermore, liquid B was applied and dried in the same manner with hot air to form a 2071 m O) charge transfer layer a! ! ! do. The electrophotographic photoreceptor thus produced is referred to as Sample 1.

On the other hand, for comparison, without providing a layer of silicone coupling material, r! ! A sample 2 was prepared by applying liquid A and liquid B as end layers on the bright four-electrode layer.

Sample 1 and Sample 2 were also coated with Sun 1 for adhesion evaluation.
Twenty pieces of each were made, and three 69-valent adhesion tests were conducted using a cross-cut tester. Table 1 shows the fortune-telling results of the seven days.

For the evaluation of the adhesion test, those that did not peel off at all in the cross-cut test were evaluated as ○, those that peeled less than 1% as Δ, and those that peeled as much as 1% or more were evaluated as ×.

The photosensitivity test results are also listed in Table 1. Photosensitivity was measured using an electrostatic copying paper tester (SP-428, Kawaguchi Electric).
The values in Table 1 were compared using the exposure m until the initial surface potential was halved due to optical attenuation (half-halving exposure).
The average value of 0 samples is shown.

In the above example, the silicon coupling agent is applied by gravure printing, but the same effect can be obtained by applying it in dots by screen printing. For this purpose, it is desirable to apply the silicone coupling material in the form of dots or meshes; if it is applied to the entire surface, electrical connection will not be established.

Table 1 [Effects of the Invention] From the results of the Examples (Table 1), the electrophotographic photoreceptor of the present invention (Sample 1 in Table 1) is superior to the conventional electrophotographic photoreceptor (Sample 2 in Table 1). Compared to the above, it has a very good adhesion with the support and has the effect of 1ρ with almost no decrease in photosensitivity.

Claims (2)

[Claims] (1) In an electrophotographic photoreceptor consisting of an organic photoconductive substance, a transparent conductive substance, and a transparent support, a layer of a silane coupling material was formed between the organic photoconductive substance and the transparent conductive substance. An electrophotographic photoreceptor characterized by: (2) The electrophotographic photoreceptor according to claim 1, wherein the silane coupling material according to claim 1 is attached in a dot shape.