JPH01280763A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To improve photosensitive characteristics and to enhance the strength to heat and impact by providing a photosensitive layer contg. an aminobiphenyl compd. expressed by prescribed formula as an effective component on a conductive base. CONSTITUTION:The photosensitive body 2 contg. at least one kind of the compd. expressed by formula I [R<1>, R<2>, R<3> denote a hydrogen atom, amino group, alkoxy group, thioalkoxy group, aryloxy group, methylenedioxy group, substd. or unsubstd. alkyl group, halogen atom or substd. or unsubstd. aryl group; R<2> denotes a hydrogen atom, alkoxy group, substd. or unsubstd. alkyl group or halogen group, exclusive of the case in which all of R<1>-R<4> are the hydrogen atom; (k), l, m, n denote 1, 2, 3 or 4 integer and R<1>-R<4> may be the same as or different from each other when if each thereof is 2, 3, 4 integer] as the effective component is provided on the conductive base 1. This photosensitive body 2 has the excellent photosensitive characteristics and the improved durabil ity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an electrophotographic photoreceptor, and more particularly to an electrophotographic photoreceptor containing a specific compound in a photosensitive layer.

[Prior art]

Conventionally, inorganic materials such as selenium, sulfurized lead, and sulfurized lead have been used as photoconductive materials for photoreceptors that can be used in electrophotography. The "electrophotographic method" referred to here generally means that a photoconductive photoreceptor is first charged in a dark place, for example by corona discharge, and then imagewise exposed to selectively dissipate the charge only in the exposed areas. to obtain an electrostatic latent image, and this latent image area is developed and visualized with electrostatic fine particles (toner) consisting of a coloring material such as a dye or pigment and a binder such as a polymer substance to form an image. This is one of the most widely used image forming methods.

The basic characteristics required of a photoreceptor in such electrophotography are (1) ability to conduct 4F to an appropriate potential in a dark place, (2) low charge dissipation in a dark place, (3) Examples include scales that quickly dissipate charge when irradiated with light.

Incidentally, the reality is that each of the above-mentioned inorganic substances has many advantages, but also has various disadvantages. For example, selenium, which is currently widely used, fully satisfies the conditions (1) to (3) in 1) η, but
The manufacturing conditions are difficult and the manufacturing cost is high,
It has no flexibility and is difficult to process into a belt shape.
It also has drawbacks such as being sensitive to heat and mechanical shock and requiring careful handling.

Sulfidation power 1-mium and zinc oxide are used as photoreceptors by being dispersed in a resin as a binder, but they have mechanical drawbacks such as smoothness, hardness, tensile strength, and abrasion resistance, so they cannot be used as they are. cannot be used repeatedly.

In recent years, electrophotographic photoreceptors using various organic materials have been proposed in order to eliminate the drawbacks of these inorganic materials, and some of them have been put into practical use. For example, a photoreceptor made of poly-N-vinylcarbazole and 2,4,7-1-di-21-rofluorene-9-one (U.S. Pat.
7), a photoreceptor made by sensitizing poly-N-vinylcarbazole with a biryllium salt-based color cord (Japanese Patent Publication No. 48
-25658), a photoreceptor whose main component is an organic pigment (described in JP-A-47-37543), a photoreceptor whose main component is a eutectic complex consisting of a dye and a resin (described in JP-A-47-37543), a photoreceptor whose main component is a eutectic complex consisting of a dye and a resin No. 47-10735), photoreceptors formed by dye-sensitizing 1-refined nylamine compounds (U.S. Pat. No. 3,
180,730), and a photoreceptor using poly-N-vinylcarbazole and an amine derivative as a charge transport material (Japanese Patent Laid-Open No. 1155/1983).

Although these photoreceptors have excellent properties and are considered to be of high practical value, considering the various requirements for photoreceptors in electrophotography, these requirements are still not met. The reality is that we have not yet obtained anything that fully satisfies these requirements. Also, U.S. Pat.
It is known that polyfunctional primary 3=3 amine compounds described in Publication No. 33, especially benzidine compounds, are excellent as photoconductive materials for electrophotographic photoreceptors. There is a problem that the solubility in the adhesive resin is low and crystallization occurs in the photosensitive layer. In order to improve this problem, for example, JP-A-62-112164 attempts to suppress crystallization by using it in combination with other low-molecular-weight compounds.

〔the purpose〕

One object of the present invention is to provide a photoreceptor that can eliminate the various drawbacks of the conventional photoreceptor described above and fully satisfy the conditions required in electrophotography.
Another object of the present invention is to provide an electrophotographic photoreceptor that is easy to manufacture, relatively inexpensive, and has excellent durability.

〔composition〕

According to the present invention, an electrophotographic photoreceptor is provided with a photoreceptor I containing as an active ingredient at least one aminobiphenyl compound represented by the following general formula (T) on a conductive support. is provided.

=4- (wherein R1, R3 and R4 are hydrogen atoms, amino groups, alkoxy groups, thioalkoxy groups, aryloxy groups, methylenedioxy groups, substituted or unsubstituted alkyl groups,
A halogen atom or a substituted or unsubstituted aryl group,
R2 represents a hydrogen atom, an alkoxy group, a substituted or unsubstituted alkyl group, or a halogen. However, [(1, R2
, except when R1 and R4 are all hydrogen atoms. Further, k, Q, m and n are integers of 1.2.3 or 4,
When each is an integer of 2.3 or 4, the above R1, ](2, I
+3 and 1-4 may be the same or different. ) In the present invention, the aminobiphenyl compound represented by the general formula (1) contained in the photosensitive layer is, for example, a compound represented by the general formula (
H) (In the formula, R1, R2, k and Q are the same as 荊. is the same as above.) is produced by reacting an amino compound represented by:

The aminobiphenyl compound represented by the general formula (1) obtained by the above synthesis method is illustrated below.

=7- The photoreceptor of the present invention contains one or more of the above aminobiphenyl compounds in the photosensitive layer 2 (2', 2'', 2'').
Depending on the application of these aminobiphenyl compounds, they can be used as shown in Figure 1, Figure 2, Figure 3, Figure 4, or Figure 5. be able to.

The photoreceptor shown in FIG. 1 has a conductive support 1 and a photosensitive layer 2 comprising an aminobiphenyl compound, a sensitizing dye, and a binder (binder resin).

The aminobiphenyl compound here acts as a photoconductive substance, and the generation and transfer of charge carriers necessary for light attenuation take place via the aminobiphenyl compound. However, aminobiphenyl compounds have almost no absorption in the visible region of light, so in order to form images with visible light, it is necessary to sensitize them by adding a sensitizing dye that absorbs in the visible region. be.

The photoreceptor shown in FIG. 2 has a photosensitive layer 2' in which a charge generating substance 3 is dispersed in a charge transporting medium 4 made of an aminobiphenyl compound and a binder on a conductive support 1''. be. The aminobiphenyl compound here forms the charge transport medium together with the binder (or binder and plasticizer), while the charge generating substance 3 (charge generating substance such as an inorganic or organic pigment) generates the charge carriers. . In this case, the charge transport medium 4 is mainly responsible for receiving charge carriers generated by the charge generating substance 3 and transporting them. In this photoreceptor, the basic condition is that the absorption wavelength regions of the charge generating substance and the aminobiphenyl compound do not overlap each other, mainly in the visible region. This is because in order to efficiently generate charge carriers in the charge generation material 3, it is necessary to transmit light to the surface of the charge generation material. - The aminobiphenyl compound represented by the formula (I) has almost no absorption in the visible region, generally absorbs light in the visible region, and is particularly effective as a charge transport material when combined with the charge generating material 3 that generates charge carriers. Its feature is that it works as a.

The photoreceptor shown in FIG. 3 has a photosensitive layer 2'' formed of a laminated layer of a charge-generating Jf45 mainly composed of a charge-generating substance 3 and a charge-transporting layer 4 containing an aminobiphenyl compound on a conductive support 1. It is something that

In this photoreceptor, the light transmitted through the charge transport WJ4 reaches the charge generation M5, and charge carriers are generated in that region.
On the other hand, the charge carrier layer 4 receives charge carriers and transports them. The charge carriers necessary for light attenuation are generated by the charge generation substance 3, and the charge carriers are transported by the charge carrier layer 4. 4 (mainly an aminobiphenyl compound acts). This mechanism is similar to the explanation given for the photoreceptor shown in FIG.

The photoreceptor in FIG. 4 is obtained by reversing the stacking order of the charge generation M5 in FIG. 3 and the charge transport layer 4 containing an aminobiphenyl compound, and the mechanism of charge carrier generation and transport is the same as the above explanation. You can do the same.

In this case, considering mechanical strength, the charge generation layer 5 is
A protective layer 6 can also be provided on the second side.

In order to actually produce the photoreceptor of the present invention, in the case of the photoreceptor shown in FIG. 1, one or more aminobiphenyl compounds are dissolved in a solution containing a binder, and then A liquid containing a sensitizing dye is prepared, and this is applied to the conductive support L1-.
The photosensitive layer 2 may be formed by coating and drying the photosensitive layer 2.

The thickness of photosensitive layer 1 is 3 to 50 μm, preferably 5 to 20 μm.
m is appropriate. The amount of the aminobiphenyl compound in the photosensitive layer 2 is 30 to 70% by weight, preferably about 50% by weight2, and the amount of the sensitizing dye in the photosensitive layer 2 is 0.
1 to 5 weight 2, preferably 0.5 to 3 weight fAz.

The sensitizers include Brillian 1~Clean, Victoria Blue 1), 1~Rearylmethane dyes such as methyl violet, crystal violet, acid violet 6B, Rhodamine I3, Rhodamine 6G, Rhodamine G Extra, Eosin S, Eri 1). -Rosin,
Rose Bengal, xanthine dyes such as fluorescein, thiazine dyes such as methylene blue, cyanine dyes such as cyanine, 2,6-diphenyl-4-(N
, N-dimethylaminophenyl) thiapyrylium verchlorate, benzopyrylium salt (Japanese Patent Publication No. 48-256
Examples include pyrylium dyes such as those described in Japanese Patent No. 58). Note that these sensitizing agents may be used alone or in combination of two or more.

In addition, in order to produce the photoreceptor shown in FIG. 2, fine particles of the charge generating substance 3 are dispersed in a solution containing one or more aminobiphenyl compounds and a binder, and the particles are made conductive. The photosensitive material M2' may be formed by coating the photosensitive material onto the photosensitive support 1 and drying it.

The thickness of the photosensitive layer 2' is 3 to 50 μm, preferably 5 to 20 μm.
μm is appropriate. The amount of the aminobiphenyl compound in the photosensitive layer 2' is 10 to 95% by weight, preferably 30 to 9% by weight.
The amount of the charge generating substance 3 in the photosensitive layer 2' is 0.1 to 50% by weight, preferably 1 to 20% by weight. Examples of the charge generating substance 3 include inorganic pigments such as selenium, -]5-selenium-tellurium, cadmium sulfide, cadmium-selenium sulfide, and α-silicon; examples of organic pigments include C.I. Pigmen 1 to Blue 25 (color index CI 21180), CI Pigmentore F
41 (CI21200), Sea Eye Acid Red 52
(C1, '45100), CI Basic Red 3 (CI45210), an azo pigment having a carbazole skeleton (described in JP-A-53-95033), an azo pigment having a distyrylbenzene skeleton (JP-A-53-1
33445), 1 to azo pigments having a rifenylamine skeleton (described in JP-A-53-132347)
, an azo pigment having a dibenzothiophene skeleton (Japanese Unexamined Patent Publication No. 5
4-21728), azo pigments having an oxadiazole skeleton (described in JP-A-54-12742), azo pigments having a fluorenone skeleton (described in JP-A-54-12742),
-22834), an azo pigment having a bisstilbene skeleton (described in JP-A-54-17733)
, an azo pigment with a distyryloxadiazole skeleton (
(described in JP-A No. 54-2129), azo pigments having a distyrylcarbazole skeleton (described in JP-A-54-1496)
Azo pigments such as C.I. Pigmen 1 to Blue 16 (CI 74100), such as C.I. Pigmen 1 to Blue 16 (CI 74100), e.g.
(CI 734], 0), Sea Eye Bat Die (CI
73030), and perylene pigments such as Argo Scarlet 1 to B (manufactured by Bayer) and Indanthrene Scarlet R (manufactured by Bayer). Note that these charge generating substances may be used alone or in combination of two or more types.

Furthermore, in order to produce the photoreceptor shown in FIG. 3, a charge-generating substance is vacuum-deposited on one or more conductive supports, or
A dispersion of the fine particles 3 of the charge-generating substance in a suitable solvent with a binder dissolved therein is coated and dried, and if necessary, the surface is finished by a method such as puff polishing, and the film thickness is adjusted. to form a charge generation layer 5,
A solution containing one or more aminobiphenyl compounds and a binder is applied thereon and dried to form a charge transport layer 4.
All you have to do is form. The charge generating material used to form the charge generating layer 5 is the same as that used in the description of the photosensitive layer 2'.

The thickness of the charge generation layer 5 is 5 μm or less, preferably 2 μm or less, and the thickness of the charge transport layer 4 is suitably 3 to 50 μm, preferably 5 to 20 μm. If the charge generation M5 is of a type in which fine particles 3 of a charge generation layer material are dispersed in a binder, the charge generation layer 5 of fine particles 3 of a charge generation material is
The proportion is 10 to 95% by weight, preferably 50 to 9% by weight.
0 weight is about 2. The amount of the compound in the charge transport layer 4 is 10 to 95% by weight, preferably 30 to 90% by weight. To produce the photoreceptor shown in FIG. 4, a solution containing an aminobiphenyl compound and a binder is applied onto the conductive support 1 and dried to form the charge transport layer 4. The charge generation layer 5 may be formed by applying a dispersion of fine particles of the charge generation layer material in a solvent in which a binder is dissolved, if necessary, on the carrier J- by a method such as spray coating and drying. The amount ratio of the charge generation J~ or the charge transport layer is the same as that explained with reference to FIG.

The photoreceptor shown in FIG. 5 can be prepared by forming a protective layer M6 on the charge generating layer 5 of the photoreceptor thus obtained by spray coating or the like with a suitable resin solution. As the resin used here, the binder described later can be used.

In the production of any of these photoreceptors, a metal plate or metal foil such as aluminum or a plastic film 11 on which metal such as aluminum is vapor-deposited is used on the conductive support 1.
Alternatively, paper that has been subjected to conductive treatment may be used. In addition, as a binder, condensation resins such as polyamide, polyurethane, polyester, epoxy resin, polycarbonate, and vinyl polymers such as polyvinyl ketone, polystyrene, poly-N-vinylcarbazole, and polyacrylamide can be used. However, any insulating and adhesive resin can be used.

A plasticizer is added to the binder if necessary, and examples of such plasticizers include halogenated paraffins, polychlorinated biphenyls, dimethylnaphthalene, and dibutyl phthalate.

Furthermore, in the photoreceptor obtained as described below, an adhesive JFI or barrier layer can be provided between the conductive support and the photosensitive layer, if necessary. Materials used for these layers include polyamide, nitrocellulose, aluminum oxide, etc., and the film thickness is preferably 1 μm or less.

To make a copy using the photoreceptor of the present invention, the photoreceptor surface is charged and exposed, then developed and, if necessary, transferred to paper or the like. The photoreceptor of the present invention has excellent advantages such as high sensitivity and flexibility.

〔Example〕

The present invention will be explained below with reference to Examples. In addition, in the following examples, all parts are parts by weight. .

[--Synthesis of compound of formula (T)]

(Synthesis example of compound No. 21) 4-methyl-4'-iodobiphenyl 3.38 g, 4,
．． 4'-ji! ~2.21 g of lylamine, 1.67 g of potassium carbonate, and 50 mg of copper powder were mixed with 2.5 g of benzene.
The mixture was taken in a 0mQ chamber and stirred at 205 to 208°C for 11 hours under a nitrogen stream while collinear dehydration was performed using an ester tube. After cooling to room temperature, it was filtered using CELAI 1-CELAI, and after adding Tasho water to the filtrate and distilling off the 20-trobenzene under reduced pressure, the residue was extracted with 1- toluene.
Washing with water, drying, and concentration gave a dark brown oil.

This was subjected to Chroma 1 to 2 treatments (silica gel,
Eluent: first toluene, second toluene-hexane mixed solvent) and then recrystallized from ethanol to obtain compound N2.
4-methyl-4'-N,N-bis(4-
Colorless needle-shaped crystals of aminobiphenyl (methylphenyl)2.
08g (yield 52%) was obtained.

Melting point: 118.0-119.0°C Elemental analysis values (%) as C27H25N were as follows.

CHN Actual value 88.97 6.84 3.65 reduced value
89.21 6.93 3.86 Example 1 76 parts of Diane Blue (CI Pigmen 1 to Blue 25, CI 2], 180) as a charge generating substance, 2% of polyester resin (Vylon 200, manufactured by Toyobo Co., Ltd.) 1,260 parts of the TeI-rahydrofuran solution and 3,700 parts of the Tei-rahydrofuran solution were pulverized and mixed in a ball mill, and the resulting dispersion was placed on the 11th aluminium surface of a conductive support made of aluminum-deposited polyester base with a doctor blade. Apply with a cloth and dry naturally to a thickness of approximately 1 μm.
A charge generation layer of m was formed.

On the other hand, as a charge transport substance, 2 parts of the aminobiphenyl compound No. 2], 2 parts of polycarbonate resin (K1.300 to Panrai 1, manufactured by Obihiro), and 16 parts of Te 1 to Lahydrofuran were mixed and dissolved to form a solution. , apply this onto the charge generation JG using a doctor blade, and
It was dried at 120° C. for 2 minutes and then for 5 minutes at 120° C. to form a charge transport layer with a thickness of about 20 μm, thereby producing photoreceptor No.

Examples 2 to 27 Photoreceptors Nos. 2 to 27 were prepared in exactly the same manner as in Example 1, except that the charge generating substance and the charge transporting substance (polyolefin compound) were replaced with those shown in Table 1.

Example 52 A charge generation layer was formed by vacuum-depositing selenium to a thickness of about 1 μm on an aluminum plate having a thickness of about 300 μm. Next, 2 parts of aminobiphenyl compound No. 21, polyester resin (Polyester A 1 to Hesive 4 manufactured by Teyupon)
Mix and dissolve 3 parts of 9000) and 45 parts of Te1-Rahi1-Rowaran to prepare a charge transport layer forming liquid, and apply this onto the above charge generation layer (selenium vapor deposited layer) using a doctor sprayer. After air drying, a charge transport layer having a thickness of about 10 μm was formed by drying under reduced pressure to obtain photoreceptor No. 52 of the present invention.

Example 53 Charge generation MC using perylene pigment instead of selenium (However, the thickness is approximately 0.6 μl 1 liter)
Photoreceptor No. 53 was prepared in exactly the same manner as in Example 52, except that the aminobiphenyl compound Nα21 was used as the charge transport material.

Example 54 A mixture of 1 part of Diane Blue (same as that used in Example 1) and 158 parts of TeI-Rahydrofuran was ground and mixed in a ball mill, and then 12 parts of aminobiphenyl compound No. 21 was added thereto. , 18 parts of polyester resin (Polyester Aheathysive 49000 manufactured by DuPont) was added, and the photosensitive layer forming solution obtained by further mixing was applied onto an aluminum-deposited polyester film using a doctor blade and heated at 100°C. Dry for 30 minutes to a thickness of approx.
A photosensitive layer of the present invention was formed by forming a photosensitive layer of 6 μm.
, 54 were created.

Example 55 The charge transport layer coating solution used in Example 1 was applied with a blade onto an aluminum vapor-deposited polyester film 11 substrate in the same manner as in Example I, and then dried to a thickness of about 20 μm.
A charge transport layer was formed. Bisazo pigment (P-2) 13
．． 5 parts, polyvinyl butyral (trade name: XYI ratio Union Carby 1-manufactured by Plastics Co., Ltd.) 5.4 parts, TII
After pulverizing and mixing 680 parts of F and 1020 parts of ethyl cellosolve in a ball mill, 1700 parts of ethyl cellosolve was added and mixed with stirring to obtain a charge generation layer coating liquid. This coating solution was spray coated on the above charge transport layer, and
It was dried at .degree. C. for 10 minutes to form a charge generation layer with a thickness of about 0.2 .mu.m. Furthermore, on this charge generation layer, methanol/n of polyamide resin (product name: CM-8000, manufactured by Toshi) was applied.
- spray coating with butanol solution at 1.20 °C for 30
A protective layer having a thickness of about 0.5 μm was formed by drying for a minute to prepare photoreceptor No. 55.

Photoreceptors N011-55 thus produced were tested using a commercially available static copying paper tester (Niniyo 11 Denki Seisakusho S).
P428 type) was used to perform a corona discharge of 16 KV or +6 KV for 20 seconds to charge it, then leave it in a dark place for 20 seconds, and measure the surface potential Vpo (Pol 1-) at that time.
Next, the tungsten lamp light was applied to the surface of the photoreceptor at an illuminance of 4.
．． 5 lux, and the surface potential is vpo
Find the time (seconds) until it reaches 172, and calculate the exposure amount E1/2.
(looks/seconds) was calculated. The results are shown in Table 2.

Further, each of the photoreceptors described above is charged using a commercially available electrophotographic copying machine, and then light is irradiated through the original image to form an electrostatic latent image, which is developed using a dry developer. When the resulting image (1-toner image) was electrostatically transferred onto plain paper and fixed, a clear transferred image was obtained. Even when a wet developer is used as the developer, a similarly clear transferred image can be obtained; 1.
It was done.

Comparative Example 1 P-2 was used as a charge generating substance, N was used as a charge transporting substance,
Examples except that N-diphenyl-(1,1,'biphenyl2-4-amine (comparative photoreceptor A) and 4,4',4''-1~limethyl 1~rifenylamine (comparative photoreceptor B) are used. A photoreceptor was prepared in the same manner as in 1, and its photoreceptor characteristics were measured to calculate Vpo and E1/2.As other characteristics, the surface potential (referred to as Vr) 30 seconds after the start of exposure was also measured. .The results are shown together with the photoconductor Nα5 of this case.
Shown in 3.

Table 3 In addition, in order to determine the repeated fatigue characteristics of the photoconductor Nα5 and the comparative photoconductor, charging at -7.5 KV and exposure at 30 lux were repeated, and changes in the residual surface potential Vr' were measured. The results are shown in Figure 6.

As shown in Figure 3 and Figure 6 above, comparative photoreceptor A had lower electrophotographic sensitivity (El/2) than photoreceptor Nα5 of the present invention, and an increase in residual potential (Vr') due to fatigue was observed. It can also be seen that comparative photoreceptor B has similarly low sensitivity (El/2) and exhibits a high residual potential (Vr) in its initial characteristics.

Comparative Example 2 P-2 was used as the electron-generating substance, N was used as the charge-transporting substance,
A photoreceptor was prepared in the same manner as in Example 1 except for using N-diethyl-N',N'-bis(4-methylphenyl)-(t,i'-biphenyl)-4,4'-diamine (
Comparative photoreceptor C). Charging at -7.5 KV and exposure at 30 Qux were repeated to measure changes in Vpo (v). The results are shown in Figure 7. From FIG. 7, the photoreceptor Nα5 of the present invention
Compared to this, a significant decrease in Vpo due to fatigue was observed.

〔effect〕

The photoreceptor of the present invention not only has excellent photosensitivity, but also has high strength against thermal and mechanical shocks, and can be manufactured at low cost.

[Brief explanation of the drawing]

1 to 5 are cross-sectional views enlarged in the thickness direction of an electrophotographic photoreceptor according to the present invention. FIG. 6 is a graph showing the relationship between the residual surface potential and fatigue time of the photoreceptor of the present invention and a comparison photoreceptor, and FIG. 7 is a graph showing the relationship between the surface potential and fatigue time of the photoreceptor of the invention and the comparison photoreceptor. It is a graph showing a time relationship. ■...Conductive support 2.2/, r21', 2
111.21114...Photosensitive layer 3...Charge generating substance
4...Charge transport medium or charge transport layer 5...Charge generation layer 6...Protective layer Patent applicant Ri Co., Ltd.
Co-procedural amendment band (voluntary) 1. Description of the case Patent Application No. 247033 of 1988 2, Title of the invention Electrophotographic photoreceptor 3, Person making the amendment Relationship to the case Patent applicant address 1-1-13-6 Nakamagome, Ota-ku, Tokyo given name
Name (674) Rico Co., Ltd. - Representative Hama 1) Hiro 4, Agent 〒151 5, Date of amendment order Voluntary 8, Contents of amendment The following amendments will be made in the specification of this application. (1) The first line of page 8 is corrected to ``.'' (2) The 9th line of page 12 is corrected to ``. (3) Table 3 on page 34 is corrected as follows. “Table 3” (4) “Electron generating substance” in line 5 of page 35 will be corrected to “charge generating substance”. (5) Figures 6 and 7 will be corrected as shown in the attached sheet.

Claims (1)

[Claims] (1) An electrophotographic photoreceptor comprising, on a conductive support, a photosensitive layer containing as an active ingredient at least one aminobiphenyl compound represented by the following general formula (I). ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (I) (In the formula, R^1, R^3 and R^4 are hydrogen atoms, amino groups, alkoxy groups, thioalkoxy groups, aryloxy groups, methylenedioxy groups , a substituted or unsubstituted alkyl group, a halogen atom, or a substituted or unsubstituted aryl group, and R^2 represents a hydrogen atom, an alkoxy group, a substituted or unsubstituted alkyl group, or a halogen.However, R^
1. Except when R^2, R^3 and R^4 are all hydrogen atoms. In addition, k, l, m, and n are integers of 1, 2, 3, or 4, and when each is an integer of 2, 3, or 4, the above R^1, R^2, R^3, and R^4 are They may be the same or different. )