JPS6348564A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To obtain the titled body having improved flexibility and printing resistance, without reducing the electrophotographic characteristics by forming a protective layer composed of a UV curable resin on a photoconductive layer. CONSTITUTION:The electric charge generating layer is formed by coating the substrate body mounted In2O3 deposited layer thereon with a coating solution of the electric charge generating layer followed by drying it with a hot air to remove a solvent. And, similarly, the electric charge transfer layer is formed by coating the obtd. electric charge generating layer with the coating solution of the electric charge transfer layer, followed by evaporating the solvent. And, subsequently, the protective layer is formed by coating the obtd. electric charge transfer layer with the coating solution of the UV curable resin, followed by radiating UV rays on the protective layer, after evaporating the solvent. Thus, the titled body which has the improved flexibility and printing resistance (hardness) and does not hardly reduce the photosensitivity is obd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electrophotographic photoreceptor having excellent flexibility and rigidity without reducing dark resistance or photosensitivity.

[Conventional technology]

Conventionally, inorganic photoconductors such as zinc oxide, selenium, and hycadmium sulfate, which are known as inorganic and organic photoconductive substances, have been used as electrophotographic X-sensitive materials.
Although it has excellent properties in terms of photosensitivity, it has problems with transparency, lightness, pliability, and pollution.

On the other hand, organic photoconductive materials are lighter than inorganic materials.
Many substances are known in addition to I-i, and examples of low-molecular organic photoconductive substances include various moderate metal phthalocyanines, metal-free phthalocyanines, oxane heptazole derivatives,
Benzimidazole derivatives and the like are examples of polymer-type organic photoconductive substances, such as those described in Japanese Patent Publication No. 42-1867.
4, Japanese Patent Publication No. 42-25230, etc.

Polymers containing a heterocycle such as a carbazole ring, or a polynuclear aromatic ring such as a naphthalene ring or anthracene ring are known.

[The problem the invention is trying to solve]

These organic photoconductive materials have wood-like characteristics such as transparency, light weight, and non-polluting properties, and have significantly lower photosensitivity than inorganic materials. Until now, photoconductive materials have been less practical than inorganic photoconductive materials because there are many points to be improved. Among these, the former's photosensitivity has been improved by the disclosure of useful organic photoconductive substances and sensitizers due to advances in organic synthesis technology, and their practical value has increased dramatically, but the latter's There are many problems regarding the optical properties of organic photoconductive materials, which pose a major obstacle to the practical application of organic photoconducting materials. For example, polymeric organic photoconductive materials have strong intermolecular cohesive forces, often crystallize, and lose their transparency.
It has drawbacks such as poor adhesion to the support. For low-molecular-weight organic photoconductive materials, there are two methods: 1. forming a photosensitive layer; For this purpose, vapor deposition, dispersion or dissolution in a dark resin, etc. have been used, but in the case of vapor deposition, there are problems with flexibility, adhesion to the support, and drying, efficiency and cost during photosensitive layer formation. When dispersing or dissolving in a resin, flexibility and printing durability are mostly determined by the properties of the resin that is the binder. Furthermore, even if these properties are good, there are accompanying effects that impair desired electrophotographic properties, such as a decrease in surface potential and a decrease in photosensitivity, making it difficult to achieve satisfactory results. I can't give anything fc.

The present invention solves the above-mentioned problems, and its purpose is to provide an electrophotographic photosensitive material that has excellent exchangeability and printing durability without deteriorating the electrophotographic characteristics. [Means for solving the problems] The electrophotosensitive member according to the present invention is an electrophotographic photosensitive member having a photoconductive layer containing an organic conductive material 1i and a resin. , a protective layer made of an ultraviolet curable resin is formed on the photoconductive layer.

The present invention will be specifically explained below by way of examples.

〔Example〕

Component 9 (e) shown in the following examples is all weight %.

Examples of copper lid O cyanine 4% (S?tmit
on cyanine Bhte LBGN (Sumitomo Chemical) Polyester resin 4 (Pylon 200 Toyobo) Mixed solvent 92 (Methyl ethyl ketone: Toluene = 1:1) Disperse the above components in a ball mill for 24 hours to make charge generation 1 liquid Polycarbonate resin 15 Chi (N0VAR
EX Mitsubishi Kasei) Nphenylhydrazone derivative 4 +5% (CTC-25
6) Tetrahydrofuran 70 Midohi components are mixed and dissolved to prepare a charge transfer layer liquid.

Next process: Using a polyester film (High Beam 100L-13 02 East) with a n2o3 vaporized N layer as a support, charge generation and S liquid was applied to it, and the solvent was removed by hot air drying. One layer of load generation is applied to 7 of 1 μm.

Furthermore, apply the charge transfer l1l1 layer liquid and do the same? Remove the agent! ! The charge transfer layer has a thickness of 20 μm. Furthermore, on top of that is ultraviolet curing resin (Three Bond 3070).

Three Bond) was applied, the solvent was removed in the same manner, and ultraviolet rays were irradiated for 6 seconds to form a 1 μm thick laminated layer to obtain an electrophotographic photoreceptor.

A comparative example is an electrophotographic photoreceptor of Example 1 coated with an ultraviolet curable resin.

Example 2゜Metal-free phthalocyanine 4-width (Dainippon Inc.) Polyvinyl butyral resin 4-width (5-LEC)
BM-2fJ Water Chemistry) Mixed solvent Section 92 (Methyl ethyl ketone: Toluene = 1:i> The above components were mixed in a ball mill with 2
Disperse for 6 hours to prepare a charge generation layer solution.

Poly-N-vinylcarbazole 45% (
RASF > Polyester resin 15 bombs (Byron 2
00 Toyobo) Tetrahydrofuran Section 70 The above components are mixed and dissolved to prepare a charge transfer layer liquid.

Next, each was coated in the same manner as in Example 1, and then an ultraviolet curable resin (ThreeBond' 307Q, ThreeBond) was coated, the solvent was removed, and a UV layer was applied for 6'43 seconds to form a 1 μm thick protective film. This layer was used as an electrophotographic photoreceptor.

Comparative Example 2 The electrophotographic photoreceptor of Example 2 was not coated with an ultraviolet curable resin.

The photosensitivity, 5T flexibility, and printing durability of the fc electrophotosensitive materials obtained in Example 1.2 and Comparative Example 1.2 were tested as follows.

The photosensitivity e was compared using a static bottom copying paper tester (F3p-628 Kawaguchi Electric Co., Ltd.) using the initial surface potential h' - the exposure f until it is halved due to light reduction (half-attenuation exposure f).

Deposability is achieved by wrapping the photoconductive layer (charge generation layer, charge transfer layer laminated thereon, and protective layer laminated thereon) around cylinders with different diameters, with the photoconductive layer (charge generation layer, charge transfer layer laminated thereon, and protective layer laminated thereon) facing outward. It is expressed as the diameter at which a crack occurs. Practical value h of 5tx or less; necessary, preferably value h of 3flx or less
;is necessary.

Printing durability was evaluated using a lead aging tester (Toyo Seiki). The load is 1 to 9. The roaring corner of the core is 45 honey, and 5 samples are measured and 3 or more are good;
The electrophotography, almost optical material, is considered to be a passing grade [2]. Practical use requires HB, preferably 2H or more of agony.

Photosensitivity of Doma Example 1.2 and Comparative Example 1.2.

The measurement results of flexibility and printing durability (Satsuba) are shown in Table 1.

Table 1 [Effects of the Invention] From the results of Example 1.2 (No. 1), the electrophotographic photoreceptor having the protective layer of the present invention has better performance than the electrophotographic photoreceptor having no protective layer. It is clear that it has excellent flexibility, excellent printing durability (hardening), and almost no decrease in photosensitivity.

The above applicants are Seiko Epson Co., Ltd. agent, patent attorney Tsutomu Mogami, and one other person'・ゝ°・.

Claims (1)

[Claims] An electrophotographic photoreceptor having a photoconductive layer containing an organic photoconductive substance and a resin, characterized in that a protective layer made of an ultraviolet curable resin is formed on the photoconductive layer.