JPH03219258A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To improve repetitive characteristics by laminating a charge generating layer and a charge transfer layer in this order on a conductive base and incorporating compds. having epoxy groups into the charge generating layer. CONSTITUTION:The charge generating layer contg. the charge generating material which generates carriers by absorbing light and the charge transfer layer contg. the charge transfer material which moves the generated carriers are laminated in this order on the conductive base. At least one kind of the compds. having the epoxy groups are incorporated into this charge generating layer. The compds. having the epoxy groups are particularly preferably the compds. expressed by formulas I and II. In the formula I, R denotes a hydrogen atom or alkyl group; L, M denote an integer larger than 0. In the formula II, N+Z denotes an integer larger than 0. The durability by repetition is improved in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Field of Application The present invention relates to an electrophotographic photoreceptor, and more particularly to a laminated electrophotographic photoreceptor with excellent repeatability.

(B) Prior Art and its Problems Conventionally, electrophotographic photoreceptors having photosensitive layers containing inorganic photoconductors such as selenium, zinc oxide, and cadmium sulfide as main components have been widely known.

However, these are not necessarily satisfactory in terms of sensitivity, thermal stability, moisture resistance, durability, etc. In addition, selenium and cadmium sulfide are particularly toxic, so there are restrictions in production and handling.

On the other hand, electrophotographic photoreceptors having a photosensitive layer containing an organic photoconductive compound as a main component are relatively easy to manufacture, inexpensive, easy to handle, and generally compared to selenium photoreceptors. It has many advantages, including excellent thermal stability, and has attracted a lot of attention in recent years.

Poly-N-vinylcarbazole is well known as such an organic photoconductive compound, and 2.4.
An electrophotographic photoreceptor having a photosensitive layer containing as a main component a charge transfer complex formed with a Lewis acid such as 7-trinitro-9-fluorenone is described in Japanese Patent Publication No. 50-10496. However, this photoreceptor is not necessarily satisfactory in sensitivity, film formability, and durability.

In response, low molecular weight organic photoconductors typified by hydrazones and pyrazolines have been proposed. By combining these with an appropriate binder, film formability has been significantly improved, but sensitivity and durability are still far from satisfactory.

For this reason, in recent years, carrier generation and carrier transport functions have been assigned to separate substances. A laminated photoreceptor was proposed. By adopting this structure, the charging characteristics and sensitivity are greatly improved.In particular, an azo pigment with a high carrier generation ability is used in the charge generation layer, and a charge transfer material containing a hydrazone-based charge transfer substance with a high carrier transport ability is used in the charge generation layer. By combining layers, some have emerged that have sensitivity close to that of inorganic photoreceptors such as Se. As a result, the current situation is that photoreceptors containing these types of organic photoconductive compounds as main components are beginning to make significant inroads into the fields of copying machines, printers, and the like.

On the other hand, with electrophotographic photoreceptors using such organic materials, as the electrophotographic process of charging, exposure, and static elimination is repeated in a copying machine, the initial charging potential decreases and the residual potential after static elimination increases, etc. There is a big problem in using it.

(C) Object of the Invention An object of the present invention is to provide an electrophotographic photoreceptor whose characteristics do not change even if it is repeatedly used in an electrophotographic process and whose repeatability characteristics are improved.

CD) Structure of the Invention The present invention provides a charge generation layer containing a charge generation substance that absorbs light and generates carriers, and a charge transfer layer containing a charge transfer substance that moves the generated carriers, on a conductive support. The charge generation layer of the multilayer electrophotographic photoreceptor formed by laminating the following in this order is characterized in that at least one compound having an epoxy group is contained therein.

Examples of the compound having an epoxy group used in the present invention include, but are not limited to, the following.

Cl-1) CH5+cH2ho÷CH2CH2O9CH2CHCH
2(1-5) (I 3) where a is an integer greater than 0.

Here g is greater than O is a large integer.

Cl-14) h and i are integers greater than or equal to 0 And X is a halogen atom shows.

Cl-15) H5 where b is greater than 0 is a large integer Here C%d is O is a larger integer.

Here e and f are 0 is a larger integer.

j represents an integer greater than 0 (f-16) Furthermore, for example, a polymer containing an epoxy group can also be obtained by synthesizing a polymer using the following compound (1-19).

17) t is an integer greater than or equal to 0, R5 and R6 are water Indicates an elementary atom or an alkyl group.

(1-18) The resulting polymer is shown below.

CR5 0CH2CHCH2 k is an integer of 0 or more, and R3 and R4 represent a hydrogen atom or an alkyl group.

21) (1-24) 22] H where m, n, 0, p, q, r-s, t, [1
, v, w, y, z, α indicate the composition ratio of monomers, m
+n=1.0-1-p q=l, r+s+t=1, u+
v+W==1, y+z+α=1.

23) [Among the above compounds having an epoxy group, I-6, 1-7
, ■-12, ■-16, ■-18, ■-21, etc. are preferred, and those represented by the following general formula are particularly preferred.

I-A) In the formula, R represents a hydrogen atom or an alkyl group, L and M represent an integer greater than 0, and the above-mentioned exemplified compounds i-6 and I-7 correspond.

CI-B] In the formula, N+Z represents an integer greater than 0, and the above-mentioned exemplified compounds 1-12 and 2-16 correspond.

Each component of the present invention will be explained in detail below.

First, as the conductive support on which the photosensitive layer is formed, any of those employed in well-known electrophotographic photoreceptors can be used.

Specifically, for example, a metal drum made of aluminum, copper, etc.
Examples include sheets, laminates, vapor deposits, etc. of these metal foils.

Further examples include plastic films, plastic drums, paper, etc. which are coated with a conductive substance such as metal powder, carbon blank, copper iodide, or polymer electrolyte together with a suitable binder to conductivity treatment.

Other examples include plastic sheets and drums that contain conductive substances such as metal powder, carbon black, and carbon fibers and are made conductive.

The charge generation layer can be provided by dispersing a pigment or dye as a charge generation substance together with the above-mentioned epoxy compound or, if necessary, with another resin as a binder and coating the mixture in a solvent.

As binders for the charge generation layer, conventionally known polymers and copolymers of vinyl compounds such as styrene, vinyl acetate, acrylic esters, methacrylic esters, phenoxy resins, butyral resins, formal resins, urethane resins, Examples include, but are not limited to, phenol resins and polyester resins.

Pigments that can be used include azo pigments such as monoazo pigments, polyazo pigments, metal complex azo pigments, pyrazolone azo pigments, stilbene pigments, and thiazole azo pigments, and perylene pigments such as perylene acid anhydride and perylene acid imide. pigments, anthraquinone derivatives, anthanthrone derivatives, dibenzpyrenequinone derivatives,
Anthraquinone or polycyclic quinone pigments such as pyranthrone derivatives, violanthrone derivatives, and isoviolanthrone derivatives; phthalocyanine pigments such as metal phthalocyanine, metal naphthalonoanine, metal-free phthalocyanine, metal-free naphthalocyanine, etc. can be given. Dyes that can be used include lutriphenylmethane dyes such as methyl violet, quinone dyes such as quinizarin, biryllium salts, thiapyrylium salts, and benzobyrylium salts.

The compound containing the ebok/group is a charge generating substance 100
o, 1-iooo parts by weight, preferably 1 to 1-iooo parts by weight
About 400 parts by weight is used.

When another resin is used as a binder, the binder resin is used in an amount of about 1 to 1000 parts by weight, preferably about 10 to 200 parts by weight, per 100 parts by weight of the charge generating substance. The thickness of the charge generation layer is preferably about 0.1 to 2 μm.

Examples of solvents include ethers such as 1,2-dimethoxyethane, tetrahydrofuran, and 1,4-dioxane; ketones such as methyl ethyl ketone and cyclohexanone; aromatic hydrocarbons such as toluene and xylene; N,N-dimethylformamide, acetonitrile, Aprotic polar solvents such as N-methylpyrrolidone and dimethyl sulfoxide; Alcohols such as methanol, ethanol, and impropatol; Esters such as ethyl acetate, methyl acetate, and methyl cellosolve acetate; Chlorinated hydrocarbons such as dichloroethane and chloroform Examples include.

The charge transfer layer can be provided by dissolving a binder and a charge transfer substance in a suitable solvent and coating the solution.

The charge transfer substance is used in an amount of about 20 to 500 parts by weight, preferably about 50 to 200 parts by weight, when the binder is 100 parts by weight.

Binders include polymers and copolymers of vinyl compounds such as styrene, vinyl chloride, acrylic esters, methacrylic esters, and vinyl acetate, phenoxy resins, polysulfones, polycarbonates, polyarylates, polyesters, cellulose esters, cellulose ethers, and urethane resins. , epoxy resin, silicone resin, etc.

The solvents are tetrahydrofuran, Me5-)Li ethyl ketone, benzene, toluene, monochlorobenzene, 1
, 2-dichloroethane, methylene chloride, ethyl acetate, etc. are used.

Specific examples of the charge transfer substance include, but are not limited to, the following.

(If-1) (■ 2) (n-3) (II-6) (If-7) (II-8) (n-9) (It-10) The photosensitive layer of the electrophotographic photoreceptor of the present invention is A well-known plasticizer may be contained in order to improve film formability, flexibility, and mechanical strength. Plasticizers include phthalate esters, phosphate esters, chlorinated paraffins, chlorinated fatty acid esters,
Examples include aromatic compounds such as methylnaphthalene.

Furthermore, in order to improve the electrophotographic properties of the photoreceptor, additives such as antioxidants may be included, and if necessary, the photoreceptor may have an adhesive layer, an intermediate layer, a transparent insulating layer, a surface protective layer, etc. Good too.

(E) Example Next, examples of the present invention will be described.

Example 1 The thickness of the charge transfer layer is preferably about 5 to 100 microns.

Azo compound 0.22 having this structural formula and exemplified compound l
-6 (n, m is 3 or 4) epoxy compound (Karesin BPO-20E manufactured by Shin Nippon Chemical Co., Ltd.) 0.22 and added to 20 grams of tetrahydrofuran, and in a paint shaker
Spread out the time.

The obtained dispersion was used as a conductive support (Metal Me manufactured by Panatsuk Kogyo ■) with aluminum vapor-deposited on a PET film.
A charge generation layer was formed thereon by coating and drying so that the film thickness after drying was 0.2 μm.

Furthermore, the hydrazine compound 2.0 of the compound (I-2)
? , polyarylate resin (Unitika U-100) 2
．． Of was dissolved in methylene chloride 202 and coated to form a charge transfer layer so that the film thickness after drying was 20 μm, thereby producing an electrophotographic photoreceptor.

After the photoreceptor was stored in the dark at room temperature for a day and night, the amount of charge on the photoreceptor was measured at a charging voltage of -4.8 KV using an electrostatic paper tester [5P-428J (manufactured by Kawaguchi Electric Seisakusho).

Next, the surface of the photosensitive layer was irradiated with light from a 5000 lux fluorescent lamp for 5 minutes, and then the amount of charge on the photoreceptor was measured again under the same charging conditions, and the ratio of the amount of charge before and after light irradiation was calculated as a percentage. was taken as the pre-exposure characteristic.

There is also a copy machine rsF'-8100J (Sharp ■
(manufactured by Toretsuk) and measured the surface potential using a surface electrometer [344J (manufactured by Toretsuk).
,000 repetitions and changes in initial potential and residual potential were measured.

Here, the initial potential is the surface potential of the photoconductor when no light is irradiated, and is approximately 750 to 650 ■, and the residual potential is the remaining surface potential of the photoconductor after the surface potential is removed by static eliminating light. .

The results are shown in Table 1.

Comparative Example 1 The same azo compound 0.2f and phenoxy resin (
P (manufactured by UCC), KHJ) 0.2 F was added to tetrahydrofuran 20- and dispersed in a paint shaker for 2 hours. A charge generation layer and a charge transfer layer were formed in the same manner as in Example 1, an electrophotographic photoreceptor was prepared, and its pre-exposure characteristics and potential fluctuations due to repetition were measured. The results are shown in Table 1.

Comparative Example 2 An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that a polyester resin (V2O0, manufactured by Toyobo ■) was used as the binder for the charge generation layer, and its characteristics were investigated. The results are shown in Table 1.

(Space below) Example 2 A photoreceptor was prepared in the same manner as in Example 1, except that the hydrazone compound Cl-2) was changed to (1-5), and the pre-exposure characteristics and the test were repeated 10,000 times. The changes in initial potential and residual potential were measured.

The results are shown in Table 2.

Comparative Example 3 Photosensing was carried out in the same manner as in Example 1, except that the same charge generation layer binder (phenoxy resin PKHJ) as in Comparative Example 1 was used, and the same hydrazone compound ((1-5) above) as in Example 2 was used. Created a body and measured its properties. The results are shown in Table 2.

Comparative Example 4 The same procedure as in Example 1 was carried out, except that the same charge generation layer binder (polyester resin Pylon 200) as in Comparative Example 2 was used, and the same hydrazone compound as in Example 2 (CI-5) was used. A photoreceptor was created and its characteristics were measured. The results are shown in Table 2.

Example 3 0.27" of the same azo compound as in Example 1, 0.15" of the Evokin resin (Recaresin BPO-20E) and 0.05 F of phenoxy resin (PKHJ manufactured by UCC) were mixed with 1,2-dimethoxyethane 20- In addition, the dispersion was dispersed for 2 hours using a paint shaker.The resulting dispersion was prepared in Example 1.
A photoreceptor was prepared by coating in the same manner as above, and the characteristics were measured. The results are given in Table 3.

Example 4 0.22 of the same azo compound as in Example 1, 0.19 of the Epoquin resin (Recaresin BPO-20E), and 0.1 of the phenoxy resin (PKHJ)? was added to 20-1,2-dimethoxyethane and dispersed in a paint shaker for 2 hours. The resulting dispersion was applied in the same manner as in Example 1 to prepare a photoreceptor and its properties were measured. The results are given in Table 3.

Example 5 0.22 of the same azo compound as in Example 1 and 0.05 of the Evoquin resin (BPO-20E)? and phenoxy resin (PKHJ) 0.151 were added to 20% of 1,2-dimethoxyethane and dispersed in a paint shaker for 2 hours. The resulting dispersion was applied in the same manner as in Example 1 to prepare a photoreceptor and its properties were measured.

The results are shown in Table 3.

Example 6 0.2f of the azo compound represented by the structural formula and 0.2f of a novolac type epoxy resin (YDCN manufactured by Tobu Kasei) were mixed into 1.2-
It was added to 20 ml of dimethoxyethane and dispersed for 2 hours using a paint shaker. Aluminum was vapor-deposited on the resulting dispersion IPET film, and the film was coated and dried on a conductive support (Metal Me, manufactured by Panatsuk Kogyo ■) to a film thickness of 0.2 μm to form a charge generation layer. . Furthermore, the hydrazone 2.0 of compound Cl-2)? , polyarylate (U-Zoo manufactured by Unitika ■) 2-Or was dissolved in methylene chloride 201 and coated to a film thickness of 20 μm after drying to form a charge transfer layer to prepare an electrophotographic photoreceptor. did.

After storing this photoreceptor in the dark at room temperature for a day and night, the amount of charge on the photoreceptor was measured at a charging voltage of -4.8XV using an electrostatic paper tester "5P-428J (manufactured by Kawaguchi Electric Seisakusho). The body surface is irradiated with light from a 50,001 ux fluorescent lamp for 5 minutes, and then the amount of charge on the photoreceptor is measured again under the same charging conditions.The ratio of the amount of charge before and after the light irradiation is calculated as a percentage, and this is calculated as the pre-exposure characteristic. value.

There is also a copying machine “5F-8100J (manufactured by Sharp ■)”
The developing section of the sample was removed, and the surface potential was tracked using a surface electrometer R343J (manufactured by Resoku Co., Ltd.), and changes in the initial potential and residual potential after repeated use 10,000 times were measured.

Example 7 The binder of the charge generation layer was a novolac type epoxy resin (
An electrophotographic photoreceptor was prepared in the same manner as in Example 1, except that YDPN (manufactured by Toto Kasei ■) was used, and its properties were investigated. Table 1 shows the results.
Shown below.

Comparative Examples 5, 6.7 The binder of the charge generation layer was phenoxy resin (PKHJ manufactured by UCC) in Comparative Example 1, polyester resin (V-200 manufactured by Toyobo) in Comparative Example 2, and butyral resin (Denka ■) in Comparative Example 3. (manufactured by ≠ 5000-A)
An electrophotographic photoreceptor was prepared in the same manner as in Example 6, and its characteristics were investigated. The results are shown in Table 4.

(Example 8 The following azo compound is 0.29 and the exemplified compound (1-6) is Recaregi yBP manufactured by Shin Nippon Chemical, where n and m are 3 or 4.
O-20E 0.25' was added to 20CH of 1,2-dimethoxyethane and dispersed together with glass beads in a paint shaker for 4 hours to obtain a pigment dispersion.

The obtained dispersion was coated with aluminum foil (S10) with a thickness of 0.1 mm.
50, manufactured by Nippon Test Panel Co., Ltd., and dried at 80° C. for 15 minutes to form a charge generation layer.

The film thickness after drying was 0.2 μm.

Furthermore, the hydrazone compound 2.0 of the compound (n-2)
2 and polyarylate resin (Unitika U-100)
1.0? and modified polycarbonate resin (Z-200 manufactured by Mitsubishi Gas Chemical Co., Ltd.) 1.07, α-tocopherol 0.04 f as an additive, methylene chloride 2
02 and coated on the charge generating layer, and heated at 80°C to 1
After drying for a while, a charge transfer layer was laminated to prepare an electrophotographic photoreceptor. The thickness of the charge transfer layer was 20 μm.

After storing this photoconductor in the dark at room temperature for a day and night, the developing section of the copying machine (5F-8100, manufactured by Sharp ■) was removed, and the surface potential of the photoconductor was tracked with a surface electrometer (344, manufactured by Tore 7ri @ Co., Ltd.). Changes in initial potential and residual potential were measured by repeating the test 10,000 times at room temperature. The results are shown in Table 5.

The photoreceptor was prepared and measured in the same manner as in Example 8.

Example 9 The following azo compound 0.21, exemplified compound (1-16) (EX-614 manufactured by Nagashio Kasei ■) 0.059 and butyral resin (BH-3 manufactured by Block Chemical ■) 0.059. IP was added to 20 CH of tetrahydrofuran and dispersed in a paint shaker for 4 hours to prepare a pigment dispersion, which was coated on aluminum foil and dried to form a charge generation layer.

Furthermore, the hydrazone compound 2. of the compound (II-5).
Of and polyarylate resin (Unitika U-100)
)'2. A photoreceptor was prepared by dissolving Oy and 0.01 F of ten-pentadecylhydroquinone as an additive in 2°F of methylene chloride and applying the solution onto the charge generation layer and drying to form a charge transfer layer. The results are shown in Table 5.

Example 10 Among the exemplified compounds (r-19), glycidyl methacrylate 102, hydroxyethyl methacrylate 5, and n-butyl methacrylate 851 were converted to butyl acetate 500C.
In addition to C, the mixture was heated to 80° C. while bubbling nitrogen gas.

Here, azobisisobutyronitrile (AIBN) 1.5
2 was added, and heating was continued so that the temperature of the solution during the reaction did not exceed 100°C. After 2 hours, 0°C of AIBN was added, and heating was continued at 80°C for an additional 3 hours. Of the obtained reaction solution, 40CC was diluted with 2t of methanol to obtain a white polymer. The obtained polymer was heated at 20°C and 0.5mmH.
It was dried at f for 24 hours.

This polymer is an epoxy-containing compound Cl-21).

0.21 of the azo compound used in Example 9 and 0.159 of the obtained polymer (1-21) were mixed with 5C of methyl ethyl ketone.
The pigment dispersion was poured into a mixed solvent of C and 15CH of 1,2-dimethoxyethane and dispersed in a paint shaker for 4 hours to prepare a pigment dispersion, which was coated on aluminum foil and dried to form a charge generation layer.

Furthermore, the hydrazone compound 1.6 of the compound (n-7)
2 and modified polycarbonate resin (manufactured by Mitsubishi Gas Chemical)
Z-soo)2. OR and 0.01 F of α-tocopherol as an additive dissolved in 20 fVC of methylene chloride were coated on the charge generation layer and dried to form a charge transfer layer to prepare a photoreceptor. The results are shown in Table 5.

Comparative Example 8 Azo compound 0.22 used in Example 8 and phenoxy resin (PKHJ manufactured by Union Carbide Japan) Q, 2
f A dispersion was prepared by adding 20 CC of tra-1,2-dimethoxyethane to form a charge generation layer. A photoreceptor was produced in the same manner as in Example 8 except for the above. The results are shown in Table 5.

Comparative Example 9 A photoreceptor was prepared in the same manner as Comparative Example 9 except that a polyester resin (Pylon 200 manufactured by Toyobo Co., Ltd.) was used instead of the phenoxy resin in Comparative Example 8. The results are shown in Table 5.

Comparative Example 10 A photoreceptor was prepared in the same manner as in Comparative Example 8, except that a butyral resin (Deki Kagaku ■Tei 3000-K) was used instead of the phenoxy resin in Comparative Example 8.

The results are shown in Table 5.

Comparative Example 11 A photoreceptor was prepared in the same manner as in Comparative Example 8 except that dodecyl acetate was used instead of the phenoxy resin in Comparative Example 8. The results are shown in Table 5.

Comparative Example 12 0.21% of the azo compound used in Example 9 and 0.1SP of butyral resin (BH-3 manufactured by Ukisui Kagaku ■) were mixed with 20CI1. In addition, the mixture was dispersed for 4 hours to form a charge generation layer. Furthermore, a charge transfer layer was formed in the same manner as in Example 9 to prepare a photoreceptor.

The results are shown in Table 5.

Comparative Example 13 Modified polyarylate resin (Z
A photoreceptor was prepared in the same manner as in Comparative Example 12, except that Comparative Example 12 was used. The results are shown in Table 5.

Comparative Example 14 Butyl methacrylate 952 was synthesized in 50 OCC of butyl acetate in the same manner as in Example 10 to obtain a polymer.

0.22 of the azo compound used in Example 9 and 0.155' of the obtained copolymer were added to 5 cc of methyl ethyl ketone.
and 15 CC of 1,2-dimethoxyethane to prepare a dispersion, which was applied onto aluminum foil and dried to form a charge generation layer. Furthermore, a charge transfer layer was formed in the same manner as in Example 10 to produce a photoreceptor. The results are shown in Table 5.

Comparative Example 15 0.22 of the azo compound used in Example 9 and 0.159 of phenoxy resin (PKHJ) were mixed with methyl ethyl ketone 5c.
A dispersion was prepared by pouring the dispersion into a mixed solvent of C and 15 CC of 1,2-dimethoxyethane, which was applied onto aluminum foil and dried to form a charge generation layer. Furthermore, a photoreceptor was prepared in the same manner as in Comparative Example 14.

The results are shown in Table 5.

Hydroxyethyl methacrylate 5f and n Table 5 Changes in initial potential and residual potential after 10,000 repetitions (F) Effects of the invention The electrophotographic photoreceptor obtained by the present invention has excellent pre-exposure properties as described above, and its durability improves with repeated repetitions. It is excellent.

Procedural Amendment (Radio) Date of February 1, 1991 Attachment Paper 1, Indication of Case Patent Application No. 219160 of 1990 2,
Title of the invention Relationship to the electrophotographic photoreceptor correction case Patent applicant: ``2. Claims (1) A conductive support containing a charge-generating substance that absorbs light and generates carriers. At least one kind of compound having an epoxy group is contained in the charge generation layer of a laminated electrophotographic photoreceptor formed by laminating in this order a charge generation layer and a charge transfer layer containing a charge transfer substance that transfers generated carriers. An electrophotographic photoreceptor characterized by:

(2) The compound having an epoxy group has the following formula [IA]
The electrophotographic photoreceptor according to claim 1, which is represented by:

CI-A] 4. Date of amendment order January 29, 1991 (starting point) 5. In the column formula of "Claims" of the specification subject to amendment, R is a hydrogen atom or an alkyl group, and LlM is a hydrogen atom or an alkyl group. Represents an integer greater than 0.

(3) The compound having an epoxy group has the following general formula [I'B
) The electrophotographic photoreceptor according to claim 1.

CI-B] (4) The compound having an epoxy group has the following general formula (■18
) The electrophotographic photoreceptor according to claim 1.

(I-18) In the formula, N+Z represents an integer greater than 0.

k is an integer of 0 or more, and R3 and R4 represent a hydrogen atom or an alkyl group.

(5) The compound having an epoxy group has the following general formula (I-2
1. The electrophotographic photoreceptor according to claim 1, which is represented by formula 1).

The electrophotographic photoreceptor according to claim 1, which contains 1 to 1000 parts by weight of another binder resin together with the (r-21) CH-CH3 (7) epoxy group-containing compound based on 100 parts by weight of the charge generating substance.

(8) The electrophotographic photoreceptor according to claim 1, wherein the charge generation layer has a thickness of 0.1 to 2 μm. ” CH C=0 OCH2CHCII2 \1 0, p, q represent the composition ratio of monomers, and 0 p + q represents an integer greater than 0.

(6) A charge generating substance containing a compound having an epoxy group
Claim 1 containing 0.1 to 1000 parts by weight
The electrophotographic photoreceptor described above.

Claims (8)

[Claims] (1) A charge generation layer containing a charge generation substance that absorbs light and generates carriers and a charge transfer layer containing a charge transfer substance that moves the generated carriers are laminated in this order on a conductive support. 1. A multilayer electrophotographic photoreceptor, wherein the charge generation layer contains at least one compound having an epoxy group. (2) The compound having an epoxy group has the following general formula [I −
The electrophotographic photoreceptor according to claim 1, which is represented by A]. [I-A] ▲There are mathematical formulas, chemical formulas, tables, etc.▼ In the formula, R represents a hydrogen atom or an alkyl group, and L and M represent an integer greater than 0. (3) The compound having an epoxy group has the following general formula [I −
B] The electrophotographic photoreceptor according to claim 1. [I −B] ▲There are mathematical formulas, chemical formulas, tables, etc.▼ In the formula, N+Z represents an integer greater than 0. (4) A compound having an epoxy group has the following general formula (I −
18) The electrophotographic photoconductor according to claim 1, which is represented by: (I-18) ▲There are mathematical formulas, chemical formulas, tables, etc.▼ is an integer greater than or equal to 0, and R_3 and R_4 represent a hydrogen atom or an alkyl group. (5) A compound having an epoxy group has the following general formula (I −
21) The electrophotographic photoreceptor according to claim 1. (I-21) ▲There are mathematical formulas, chemical formulas, tables, etc.▼ o, p, q represent the composition ratio of monomers, and o+p+q represent an integer greater than 0. (6) A charge generating substance containing a compound having an epoxy group
The electrophotographic photoreceptor according to claim 1, which contains 0.1 to 1000 parts by weight. (7) The electrophotographic photoreceptor according to claim 1, which contains a compound having an epoxy group and another binder resin in an amount of 1 to 1000 parts by weight per 100 parts by weight of a charge generating substance. (8) The electrophotographic photoreceptor according to claim 1, wherein the charge generation layer has a thickness of 0.1 to 2 μm.