JPS62269964A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To obtain the titled body capable of preventing changes of sensitivity and durability, etc., by using polysilane for the electrostatic charge transfer layer in the titled body composed of the two layers of the electrostatic charge generating layer and the electrostatic charge transfer layer. CONSTITUTION:The polysilane is used for the electrostatic charge transfer layer. The electrostatic charge transfer layer is formed by coating a coating solution obtd. by mixing a dispersion for forming the electrostatic charge generating layer on an aluminum plate by means of a film applicator, followed by drying the film, and subsequently by coating a solution dissolved a polysilane obtd. by effecting dehalogenation of dihalogenosilane and/or dihalogenodisilane having one of the hydrocarbon residue followed by polycondensating in toluene on the electrostatic generating layer, followed by drying it.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an electrophotographic photoreceptor. More specifically, the present invention relates to a laminated electrophotographic light body having a charge transfer layer made of a specific compound.

(Prior art) An electrophotographic photoreceptor made of an LR machine compound such as a combination of various dyes such as phthalocyanine dyes, diazo dyes, and perylene dyes with polyvinyl rubber, oxadiazole, hydrazone, pyrazoline, etc. is selenium,
Compared to electrophotographic photoreceptors made of inorganic photoconductive compounds such as cadmium sulfide, they have advantages such as non-pollution and high productivity, and various combinations of high sensitivity and excellent durability have been proposed.

[Problem that the invention seeks to solve]

Although the electrophotographic photoreceptor based on the above-mentioned nurturing compound is excellent, oxadiazole, hydrazone, pyrazoline, etc., which are suitable for the charge transfer layer, do not form a good film by themselves, and various binders must be used. However, there is a problem in that the sensitivity, durability, etc. of a photoreceptor vary depending on the characteristics of the binder. Therefore, it is desired to develop a charge transport layer that does not substantially use a binder.

[Means for solving problems]

The inventors of the present invention have conducted extensive research into ways to solve the above-mentioned problems, and have completed the present invention.

That is, the present invention provides at least 2F! of the tr:1 generation layer and the charge transfer layer. In the present invention, it is important to use polysilane as the charge transfer layer. ,
The polysilane used here is preferably a polysilane having at least one hydrocarbon residue per silicon atom.

This polysilane is preferably obtained by dehalogenation polycondensation of dihalogenosilane and/or dihalogenodisilane having at least one hydrocarbon residue. The dihalogenosilane and dihalogenodisilane used here include dimethyldichlorosilane, methylphenyldichlorosilane, diphenyldichlorosilane, diethyldichlorosilane, ethylphenyldichlorosilane, dipropyldichlorosilane, and propylphenyldichlorosilane. Dichlorosilane such as silane, dichlorodisilane such as tetramethyldichlorosifuran, trimethylphenyldichlorodisilane, dimethyldiphenyldichlorodisilane, dimethyldiethyldichlorodisilane, trimethylethyldichlorodisilane, or their fluorides in addition to the above chlorides is cited as a specific example.

There is no particular restriction on the method for producing polysilane from dihalogenosilane and/or dihalogenodisilane by dehalogenation polycondensation, but a method of heating and contacting the above dihalogenosilane and/or dihalogenodisilane with an alkali metal is preferred. For example, R, C, W
est, Comprehensive Organic
Cbnistry, Vol. 2. Chapter 9.4
．． P365-387 (1982>, edlted by
JNk:n5on at al,, Pergamo
nPress, New York) +1 In the present invention, polysilane is used as the charge transport layer, but in addition to the above polysilane, 2,4°7-dolinitro-9-furiolenone, m-dicyanobenzene, tetracyanoethylene, phthalic acid diester , triphenylamine, etc. can also be used in combination. Alternatively, the polysilane may be applied as a solution and dried to form one cargo transfer layer, which is then crosslinked by irradiation with ultraviolet rays or the like.

In the present invention, polysilane is used as the charge r@ transfer layer as described above, but various materials can be used as the charge generation layer, and there is no particular restriction, and various dyes can be preferably used.

Examples of pigments that can be used here include azo pigments such as Sudan Red, Guianpuru, and Jenas Green B, quinone pigments such as Algol Yellow, pyrenequinone, indanthrene brilliant, and violet RRP, quinocyanine pigments, indigo, Examples include indigo dyes such as thioindigo, bisbenzimidazole dyes such as Indofast Orange, phthalocyanine dyes such as sinus phthalocyanine, and quinacridone dyes such as quinacridone. It is formed into a load-generating layer along with an organic binder such as polycarbonate.

In the present invention, it is also possible to prevent the injection of free charges from the conductive support layer to the charge generation layer between the charge generation layer and the conductive support layer provided thereunder, and to prevent the injection of free charges from the conductive support layer to the charge generation layer. To improve adhesion, a layer consisting of aluminum oxide, indium oxide, tin oxide, polypropylene resin, acrylic resin, methacrylic resin, polyvinyl chloride resin, epoxo resin, polyester resin, alkyd resin, polyurethane resin, polyimide resin, etc. It is also possible to provide one.

〔Example〕

The present invention will be explained below with reference to Examples.

Example 1 β-type copper phthalocyanine (manufactured by Toyo Ink Mfg., Lion
ol Blue NCB Tonor) 99 parts by weight of toluene was added to 1 part by weight, and ultrasonic dispersion was performed for 24 hours. Next, a coating solution prepared by mixing 50 parts by weight of a 10% tetrahydrofuran solution of a saturated polyester resin (manufactured by Toyobo ■, Byron 200) and the above dispersion was applied onto a 100μ thick aluminum plate using a film applicator and dried. , a charge generation layer having a thickness of 0.5 μm was formed.

On this charge generation layer, 1 part by weight of polysilane having an average molecular weight of 200,000 obtained by polycondensing dimethyldichlorosilane and methylphenyldichlorosilane in a ratio of 1=1 with sodium metal in toluene was added to 10 parts by weight of toluene. The dissolved solution was applied and dried to form a charge transfer layer with a thickness of 7 μm.

The characteristics of the laminated electrophotographic window light material created in this way were evaluated using the Electrostatifuku Weber Analyzer EPA ~
8100 (manufactured by Kawaguchi Denki ■). first,
After performing corona discharge at -6 kV for 2 seconds and measuring the initial surface potential, it was left in a dark place for 2 seconds, and then passed through a color glass filter IR-80 (manufactured by Hoya Glass) and
The half-life exposure amount was measured by applying lux light. The results are shown in Table-1.

Examples 2 to 5 A laminated electrophotographic window illuminator was produced in the same manner as in Example 1, except that the exacerbating agent shown in Table 1 was added to the polysilane in the amount shown in Table 1, and the obtained bright light Body characteristics were measured in the same manner as in Example 1. The results are shown in Table-1.

Example 6 In the same manner as in Example 1, except that an azo dye represented by the following structural formula (synthesized according to the example of JP-A-53-133299) was used instead of β-type copper phthalocyanine. A charge generation layer was formed.

Next, a solution prepared by dissolving 5 parts by weight of the same polysilane used in Example 1 and 1 part by weight of triphenylamine in 50 parts by weight of chloroform was applied onto the charge generation layer and dried to form a charge transfer layer.

The initial surface potential and half-life exposure of the obtained laminated electrophotographic window illuminator were -447v and 761uχ·se, respectively.
It was c.

〔Effect of the invention〕

The electrophotographic copying machine of the present invention can be used not only as an electrophotographic copying machine but also in a wide range of electrophotographic application fields such as laser printers, CRT printers, and electrophotographic plate making systems, and has industrial value. .

Claims (1)

Claims: 1. An electrophotographic photoreceptor formed of at least two layers, a charge generation layer and a charge transfer layer, characterized in that polysilane is used as the charge transfer layer. 2. The electrophotographic photoreceptor according to claim 1, wherein the polysilane is obtained by dehalogenation polycondensation of a dihalogenosilane and/or a dihalogenodisilane having at least one hydrocarbon group.