JPH07181708A - Electrophotographic photoreceptor and electrophotographic device and facsimile equipped with that electrophotographic photoreceptor - Google Patents

Abstract

PURPOSE:To provide an electrophotographic photoreceptor having excellent durability, storage stability, cleaning characteristics and anti-solvent cracking property. CONSTITUTION:This electrophotographic photoreceptor has a photosensitive layer on a conductive supporting body. The surface layer of the electrophotographic photoreceptor contains a copolymer having structural units expressed by formula I and formula II. In the formula, R1-R8 are hydrogen atoms, halogen atoms, or alkyl groups of 1 to 4 carbon number respectively, A and B are alkyl groups which may have substituents respectively, or A and B are condensed to form a cyclic alkyl group. R9-R24 are hydrogen atoms, halogen atoms or alkyl groups of 1 to 4 carbon number respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic photosensitive member, an electrophotographic apparatus equipped with the electrophotographic photosensitive member, and a facsimile.

[0002]

2. Description of the Related Art In recent years, organic photoconductive materials have been widely used as materials used for electrophotographic photoreceptors because of their advantages in pollution-free property and high productivity. These electrophotographic photoreceptors are often used as function-separated photoreceptors in which a charge generation layer and a charge transport layer are laminated in order to satisfy both electric and mechanical characteristics. On the other hand, as a matter of course, the electrophotographic photosensitive member is required to have sensitivity, electrical characteristics, and optical characteristics according to the electrophotographic process applied. Particularly in the case of a photoreceptor that is repeatedly used, electrical and mechanical external forces such as corona charging, image exposure, toner development, transfer to paper, and cleaning treatment are directly applied to the surface layer of the photoreceptor. Durability is required.

Specifically, durability against deterioration of sensitivity, decrease of electric potential and increase of residual electric potential due to deterioration caused by ozone generated during corona charging, abrasion of surface due to rubbing and scratches, etc. Is required. The surface of the photoconductor is generally a thin resin layer, and the characteristics of the resin are very important. Polycarbonate resins having bisphenol A as a skeleton have been attracting attention as resins satisfying the above-mentioned conditions, but not all of the electrical characteristics described above are satisfied with bisphenol A type polycarbonate resins. I have a problem. (1) It has poor solubility and shows good solubility only in a part of halogenated aliphatic hydrocarbons such as dichloromethane and 1,2-dichloroethane. Since these halogenated aliphatic hydrocarbons have a low boiling point, the coated surface is likely to be whitened when a photoreceptor is manufactured using a coating solution prepared with these solvents. It also takes time to manage the process such as the solid content of the coating liquid. (2) For solvents other than halogenated aliphatic hydrocarbons, it is partially soluble in tetrahydrofuran, dioxane, cyclohexanone, or a mixed solvent thereof, but the solution may gel within a few days. Bad
Not suitable for photoconductor production. (3) Further, even if the drawbacks mentioned in the above (1) and (2) are improved, solvent cracks are likely to occur in the polycarbonate resin having only the bisphenol A derivative as the main chain skeleton. (4) In addition, in the conventional polycarbonate resin, the coating film formed of the resin does not have much lubricity, so that the photoconductor is likely to be scratched, resulting in an image defect, or cleaning failure due to early deterioration of the cleaning blade. In addition, the cleaning blade may be inverted to cause insufficient cleaning.

Conventionally, the solution stability mentioned in the above (1) and (2) has been solved by using a polycarbonate Z resin having a cyclohexylene group as a structural unit of a polymer. However, the polycarbonate Z resin has a relatively large volume shrinkage particularly when a coating film is formed from a solution by a casting method, and stress may remain inside the coating film. Therefore, it has a drawback that it is relatively weak against stress corrosion. In order to solve this, for example, in JP-A-61-62040, polycarbonate A
A method of reducing stress corrosion cracking by mixing a resin and a polycarbonate Z resin is disclosed. Further, Japanese Patent Laid-Open No. 61-62039 discloses a method of reducing stress corrosion cracking by copolymerizing bisphenol A and bisphenol Z, but none of them is sufficient for solvent cracking. . (5) In addition, the conventional polycarbonate resin has a drawback that the coating film formed of the resin has low durability against scratches. This is because the linearity of the polycarbonate resin itself is strong, partial scratches easily occur and it becomes an image defect,
Further, there is a drawback in that the cleaning blade is rubbed against the scratches to promote abrasion and the life of the photoreceptor is short.

Further, in recent years, a relatively large amount of a low molecular weight compound such as a charge transport material is added due to the demand for higher sensitivity of an organic electrophotographic photoreceptor, and when the electrophotographic photoreceptor is stored for a long period of time. There is a problem that the above-mentioned low molecular weight component is deposited and the layers are separated.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to solve the problems of conventional electrophotographic photoreceptors using a polycarbonate resin as a surface layer, that is, to improve the abrasion resistance and the film strength. It is an object of the present invention to provide an electrophotographic photosensitive member which is improved, has good solvent cracking property and precipitation resistance and is easy to manufacture.

[0007]

The present invention provides an electrophotographic photosensitive member having a photosensitive layer on a conductive support, wherein the surface layer of the electrophotographic photosensitive member is a structural unit represented by the following formula (1):

[0008]

[Chemical 5]

(In the formula, R _{1 to} R ₈ represent a hydrogen atom, a halogen atom or an alkyl group having 1 to 4 carbon atoms, A and B are optionally substituted alkyl groups, or A and B are integrated. And a structural unit represented by the formula (2),

[0010]

[Chemical 6]

(1) wherein R _{9 to} R ₂₄ represent a hydrogen atom, a halogen atom or an alkyl group having 1 to 4 carbon atoms. To be done. Specific examples of the structural unit represented by the formula (1) are shown in Tables 1 and 2, but are not limited thereto.

[0012]

[Table 1]

[0013]

[Table 2]

Preferred examples include the structural unit examples 1, 2 and 5, and the structural unit example 1 is particularly preferred. Formula (2)
Specific examples of the structural unit represented by are shown in Table 3, but are not limited to these.

[0015]

[Table 3]

As preferred examples, structural unit examples 12 and 13 are given.
And 16 are mentioned, and the structural unit example 12 is particularly preferable.
The copolymer having the constitutional units represented by the formulas (1) and (2) used in the present invention is a bisphenol represented by the following formula (5) and a bisphenol represented by the following formula (6) as phosgene or carbonate ester. Alternatively, it can be obtained by interfacial polymerization in the presence of chloroformate or the like.

[0017]

[Chemical 7]

(In the formula, R _{1 to} R ₈ are R in the formula (1).
It is synonymous with _{1 to} R ₈ . )

[0019]

[Chemical 8]

[0020] (R wherein R ₉ to R ₂₄ in Formula (2) ₉
~ Is synonymous with R ₂₄ . The electrophotographic photosensitive member of the present invention has particularly excellent surface strength and storage stability. The reason for this is considered to be that by introducing a copolymer having the structural unit represented by the formula (2) into the surface layer, the rigidity of the copolymer is increased and the stress applied to the inside during film formation is relaxed.

Furthermore, the addition of such a copolymer prevents layer separation due to precipitation of low molecular weight components added to the photosensitive layer. Although the cause has not been confirmed, it is considered that the skeleton of the structural unit represented by the formula (2) functions as a crystallization inhibitor against the charge transport material. That is, since the structural units represented by the formulas (1) and (2) are copolymerized for a certain amount or more, the inside of the polymer becomes random and the porosity inside decreases,
It is considered that this is because the charge transport material becomes difficult to move.

Further, a partial increase in rigidity results in an increase in film strength. In fact, the glass transition points of the copolymers of formulas (1) and (2) are found to increase by about 10 ° C. on average as compared with the polymer group represented by formula (1). By blending the above-mentioned copolymer with the polymer having the structural unit represented by the formula (1), the effect is further promoted. In such a case, the structural unit used in the copolymer is formula (1) and the structural unit used in the polymer. Formula (1) may be any compound within the definition of formula (1) and may be the same or different.

Further effects can be obtained by blending the polycarbonate containing the constitutional unit of the above formula (4). In order to create a polycarbonate containing the above formula (4), the above formula (5) and the following formula (7)
The bisphenol represented by can be obtained by interfacial polymerization in the presence of a carbonic acid ester or a chloroformate.

[0024]

[Chemical 9]

(In the formula, R _{25 to} R ₃₀ are R in the formula (4).
Synonymous with _{25 to} R ₃₀ . ) Further, n in the formula (4) represents an integer of 1 to 200,
5-100 is especially preferable. Examples of R ₂₅ and R ₂₆ include ethylene, propylene, isopropylene, butylene and pentylene, with ethylene, propylene and isopropylene being particularly preferred. Examples of constitutional units of the formula (4) are shown in Tables 4 and 5 below, but are not limited thereto.

[0026]

[Table 4]

[0027]

[Table 5]

In the electrophotographic photoreceptor of the present invention, even if the photosensitive layer is a single layer type in which the charge generating substance and the charge transporting substance are contained in the same layer, the charge generating layer containing the charge generating substance and the charge transporting substance are contained. It may be a laminated type in which a charge transport layer containing is laminated, but a laminated type (functional separation type) electrophotographic photosensitive member is preferable in order to satisfy various characteristics required for the electrophotographic photosensitive member.

If desired, a binder composition may be used as the surface protective layer. When the binder composition is used as the surface protective layer, conductive powder such as tin oxide, indium oxide, ITO, titanium oxide or the like in order to impart electric characteristics according to the electrophotographic process to be applied It is also possible to add mixtures or charge-transporting substances. The addition amount thereof is preferably 1 to 50% by weight with respect to the binder composition. A lubricant such as tetrafluoroethylene particles may be added to the surface protective layer.

When producing the electrophotographic photosensitive member of the present invention,
As the conductive support, a metal or alloy such as aluminum or stainless steel, paper, plastic, or the like is used, and the shape thereof can be arbitrary such as a cylindrical cylinder or a film depending on the electrophotographic apparatus to be applied. . In the present invention, an undercoat layer having a barrier function and an adhesive function can be provided on the conductive support.

The subbing layer is used for improving the adhesion of the photosensitive layer, improving the coating property, protecting the support, covering defects on the substrate, improving the charge injection property from the support, protecting the photosensitive layer against electrical breakdown, etc. Is formed for. Examples of the material of the undercoat layer include polyvinyl alcohol, poly-N-vinylimidazole, polyethylene oxide, ethyl cellulose, ethylene-acrylic acid copolymer, casein, polyamide, N-methoxymethylated 6 nylon, copolymerized nylon, glue, gelatin and the like. It has been known. These are dissolved in a suitable solvent and coated on a support. The film thickness at that time is preferably about 0.1 to 2 μm.

Examples of the charge generating substance in the electrophotographic photosensitive member of the present invention include selenium-tellurium, pyrylium, thiapyrylium dyes, various central metals and crystal systems, specifically α, β, γ, ε, X-type. Phthalocyanine compound having a crystal form such as, antoanthrone pigment, dibenzpyrenequinone pigment, pyranthrone pigment, trisazo pigment,
Examples thereof include disazo pigments, monoazo pigments, indigo pigments, quinacridone pigments, asymmetric quinocyanine pigments, quinocyanines, and amorphous silicones described in JP-A-54-143645.

In the case of a function-separated type photoreceptor, the charge generation layer comprises a homogenizer, ultrasonic dispersion, ball mill, vibrating ball mill, sand mill, and atom with the above-mentioned charge generation substance together with a binder resin and a solvent in an amount of 0.3 to 4 times. It is formed by well dispersing by a method such as a lighter and a roll mill, applying the dispersion, and drying. The film thickness is 5 μm or less, particularly 0.1 to 2 μm
It is preferably in the range of m.

Also. Examples of charge transport materials include pyrene and N
A carbazole compound such as -ethylcarbazole, N-isopropylcarbazole, N-methyl-N-phenylhydrazino-3-methylidene-9-ethylcarbazole, N, N-diphenylhydrazino-3-methylidene-9-ethylcarbazole; N, N-diphenylhydrazino-3-methylidene-10-ethylphenothiazine,
N, N-diphenylhydrazino-3-methylidene-10
-Ethylphenoxazine, p-diethylaminobenzaldehyde-N, N-diphenylhydrazone, p-diethylaminobenzaldehyde-N-α-naphthyl-N-phenylhydrazone, p-pyrrolidinobenzaldehyde-
Hydrazone compounds such as N, N-diphenylhydrazone, 1,3,3-trimethylindolenine-ω-aldehyde-N, N-diphenylhydrazone, p-diethylbenzaldehyde-3-methylbenzthiazolinone-2-hydrazone; 2,5-bis (p-diethylaminophenyl) -1,3,4-oxadiazole, 1-phenyl-
3- (p-diethylaminostyryl) -5- (p-diethylaminophenyl) pyrazoline, 1- [quinolyl (2)]-3- (p-diethylaminostyryl) -5-
(P-Diethylaminophenyl) pyrazoline, 1- [pyridyl (2)]-3- (p-diethylaminostyryl)
-5- (p-diethylaminophenyl) pyrazoline, 1
-[6-Methoxy-pyridyl (2)]-3- (p-diethylaminostyryl) -5- (p-diethylaminophenyl) pyrazoline, 1- [pyridyl (3)]-3- (p
-Diethylaminostyryl) -5- (p-diethylaminophenyl) pyrazoline, 1- [pyridyl (2)]-3
-(P-Diethylaminostyryl) -4-methyl-5-
(P-Diethylaminophenyl) pyrazoline, 1- [pyridyl (2)]-3- (α-methyl-p-diethylaminostyryl) -5- (p-diethylaminophenyl) pyrazoline, 1-phenyl-3- (p-diethylamino) Pyrazoline compounds such as styryl) -4-methyl-5- (p-diethylaminophenyl) pyrazoline, 1-phenyl-3- (α-benzyl-p-diethylaminostyryl) -5- (p-diethylaminophenyl) pyrazoline and spiropyrazolin 2- (p-diethylaminostyryl) -6-diethylaminobenzoxazole, 2-
Oxazole compounds such as (p-diethylaminophenyl) -4- (p-dimethylaminophenyl) -5- (2-chlorophenyl) oxazole; thiazole compounds such as 2- (p-diethylaminostyryl) -6-diethylaminobenzthiazole Triarylmethane compounds such as bis (4-diethylamino-2-methylphenyl) phenylmethane; 1,1-bis (4-N, N-)
Diethylamino-2-methylphenyl) heptane, 1,
Examples include polyarylalkanes such as 1,2,2-tetrakis-4-N, N-dimethylamino-2-methylphenyl) ethane.

The charge transport layer is formed by applying a solution obtained by dissolving the charge transport substance and the binder resin in a solvent and drying the solution. The mixing ratio of the charge transport material and the binder resin is preferably about 2: 1 to 1: 2, and the solvent thereof is an aromatic solvent such as toluene, xylene or monochlorobenzene, as well as dioxane, tetrahydrofuran or tetrahydropyran. Cyclic ethers such as can also be used. As a method for applying the dissolving agent, for example, a dip coating method, a spray coating method, a curtain coating method, a spin coating method and the like are known. The dip coating method is the best for efficient mass production of electrophotographic photoreceptors, and the copolymer of the present invention can be used by the dip coating method. 10 to 20 after application
Ventilation drying or static drying is performed at 0 ° C., preferably 20 to 150 ° C. for 5 minutes to 5 hours, preferably 10 minutes to 2 hours to form a charge transport layer having a film thickness of 5 to 30 μm.

The electrophotographic photoreceptor of the present invention can be used not only in electrophotographic copying machines but also in laser beam printers, C
RT printer, LED printer, liquid crystal printer,
It can be widely used in electrophotographic application fields such as laser plate making. The present invention also comprises an electrophotographic apparatus provided with the electrophotographic photosensitive member of the present invention.

Further, the present invention comprises an electrophotographic apparatus equipped with the electrophotographic photosensitive member of the present invention and a facsimile having a receiving means for receiving image information from a remote terminal. Next, an electrophotographic apparatus and a facsimile equipped with the electrophotographic photosensitive member of the present invention will be described. FIG. 1 shows a schematic structure of a general transfer type electrophotographic apparatus using the drum type photoreceptor of the present invention. In the figure, reference numeral 1 denotes a drum type photosensitive member as an image bearing member, which is rotationally driven around a shaft 1a in a direction of an arrow at a predetermined peripheral speed. The photosensitive member 1 is uniformly charged at its peripheral surface with a positive or negative planned potential by the charging means 2 in the course of its rotation, and then at the exposure section 3 an optical image exposure L (slit exposure. Laser beam scanning exposure). As a result, electrostatic latent images corresponding to the exposed image are sequentially formed on the peripheral surface of the photoconductor. The electrostatic latent image is then toner-developed by the developing means 4, and the toner-developed image is synchronized with the rotation of the photoconductor 1 between the photoconductor 1 and the transfer means 5 from a paper feeding portion (not shown) by the transfer means 5. The transfer material P that has been taken and fed is sequentially transferred. The transfer material P which has received the image transfer is separated from the surface of the photoconductor and is introduced into the image fixing means 8 where it is subjected to the image fixing and printed out as a copy. After the image transfer, the surface of the photoconductor 1 is cleaned by the cleaning unit 6 to remove the transfer residual toner, and the pre-exposure unit 7 removes the charge to repeatedly use the image. As a uniform charging means 2 for the photoconductor 1, a corona charging device is generally widely used. Also, as the transfer device 5, corona transfer means is generally widely used. As the electrophotographic apparatus, among the components such as the photoconductor, the developing unit, and the cleaning unit described above,
A plurality of units may be integrally combined and configured as an apparatus unit, and this unit may be configured to be detachable from the apparatus body. For example, the photosensitive member 1 and the cleaning means 6 may be integrated into one device unit, and may be detachably configured by using guide means such as a rail of the device body.
At this time, the above-mentioned apparatus unit may be provided with a charging unit and / or a developing unit. Further, when the electrophotographic apparatus is used as a copying machine or a printer, the light image exposure L uses reflected light or transmitted light from an original, or makes the original read into a signal, and scans a laser beam according to the signal. This is performed by driving the light emitting diode array, driving the liquid crystal shutter array, or the like.

When used as a printer for a facsimile, the optical image exposure L becomes an exposure for printing the received data. FIG. 2 is a block diagram showing an example of this case. The controller 10 controls the image reading unit 9 and the printer 18. Controller 10
Is controlled by the CPU 16. The read data from the image reading unit is transmitted to the partner station through the transmission circuit 12. The data received from the partner station is sent to the printer 18 through the receiving circuit 11. Predetermined image data is stored in the image memory. Printer controller 1
Reference numeral 7 controls the printer 18. 13 is a telephone. The image received from the line 14 (image information from a remote terminal connected via the line) is demodulated by the receiving circuit 11, and then the CPU 16 performs signal processing of the image information and sequentially stores it in the image memory 15. . When the image of at least one page is stored in the memory 15, the image of that page is stored. CPU 16 is 1 from memory 15.
Printer controller 1 that reads the image information of the page
The image information of one page signaled to 7 is transmitted. Upon receiving the image information of one page from the CPU 16, the printer controller 17 controls the printer 18 to record the image information of the page. The CPU 16
Is receiving the next page while the printer 18 is recording. The image is received and recorded as described above.

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples.

[0040]

【Example】

(Example 1) 50 parts by weight of conductive titanium oxide powder coated with tin oxide containing 10% antimony oxide, 25 parts by weight of phenol resin, 20 parts by weight of methyl cellosolve, 5 parts by weight of methanol and silicone oil (polydimethyl) 0.002 parts by weight of a siloxane polyoxyalkylene copolymer and an average molecular weight of 3,000 were dispersed in a sand mill using φ1 mm glass beads for 2 hours to prepare a conductive layer coating material. This coating material was applied onto a φ30 mm aluminum cylinder by a dip coating method and dried at 140 ° C. for 30 minutes to form a conductive layer having a film thickness of 20 μm.

Next, 5 parts by weight of N-methoxymethylated nylon was dissolved in 95 parts by weight of methanol to prepare a paint for the intermediate layer. This paint is applied on the above conductive layer by a dip coating method and dried at 100 ° C. for 20 minutes to give
Was formed. Next, the black angle 2θ ± 0.2 degrees in X-ray diffraction of CuKα is 9.0 degrees, 14.2 degrees,
3 parts by weight of oxytitanium phthalocyanine having strong peaks at 23.9 degrees and 27.1 degrees, polyvinyl butyral (trade name S-REC BM2, manufactured by Sekisui Chemical Co., Ltd.)
Disperse 2 parts by weight and 35 parts by weight of cyclohexanone in a sand mill using φ1 mm glass beads for 2 hours,
Thereafter, 60 parts by weight of ethyl acetate was added to prepare a charge generation layer coating material. This coating material was applied onto the above intermediate layer by a dip coating method and dried at 100 ° C. for 15 minutes to form a charge generation layer having a film thickness of 0.2 μm.

Then, 8 parts by weight of a compound of the following structural formula,

[0043]

[Chemical 10]

Then, 2 parts by weight of a compound of the following structural formula,

[0045]

[Chemical 11]

5 parts by weight of a polymer having a constitutional unit represented by the following formula (viscosity average molecular weight 2.05 × 10 ⁴ ),

[0047]

[Chemical 12]

It comprises the structural units shown in the following (a) and (b),

[0049]

[Chemical 13]

[0050]

[Chemical 14]

5 parts by weight of a copolymer (viscosity average molecular weight 2.80 × 10 ⁴ ) in which the component (a) is 90% by weight and the component (b) is 10% by weight based on the total weight of the copolymer is dichloromethane. It was dissolved in a mixed solvent of 20 parts by weight and 40 parts by weight of monochlorobenzene to prepare a charge transport layer coating material. This coating material is applied onto the charge generation layer by a dip coating method,
After drying at 0 ° C. for 60 minutes, a charge transport layer having a film thickness of 23 μm was formed to prepare an electrophotographic photoreceptor. Using the prepared electrophotographic photosensitive member, surface abrasion resistance, precipitation property with time and solvent crack resistance were measured. For the evaluation, a urethane cleaning blade was pressed against this surface layer, stored at 75 ° C., and an accelerated test for precipitation was performed. Regarding the evaluation, the photoreceptor was observed with a microscope after 14 days, and the presence or absence of precipitation was evaluated.
The test without precipitation was continued until 30 days later. Regarding the solvent cracking property, finger grease was adhered to this surface layer and left for 24 hours and 2 days at room temperature and normal humidity, and then the presence or absence of solvent cracking was observed by a microscope. Furthermore, after leaving this photoconductor at 40 ° C. and 93% RH for 24 hours, it was set in a laser beam printer (LBP-NX manufactured by Canon Inc.) and 10,000 sheets were continuously passed for durability. Black spots caused by the toner adhering to the body surface were observed.

Further, the film thickness of the charge transport layer before and after the durability test was measured, and the difference (μm) was expressed as the abrasion amount = film strength.
Further, the photoreceptor was exposed to light of 2,000 lux for 10 minutes, and after resting for 5 minutes, charged to -700 V, and the difference between where the light was exposed and where it was not exposed was displayed as a memory. The results are shown in Tables 7 and 8 below. In Table 5, ○ means 20
Three or less fine cracks are observed with a 0x microscope, but there is no effect on the image. △: 200x microscope
10 or less fine cracks are observed, but there is no effect on the image, x is a microscope with a magnification of 200, 10 or less cracks of 0.5 mm or more are recognized and the image is affected, and xx is 200 With a double microscope, countless cracks of 0.5 mm or more are recognized, which shows that the image is significantly affected.

(Examples 2 to 6) In the same manner as in Example 1 except that the component (b) at the time of copolymerization was changed as shown in the constitutional unit examples 13, 14, 16, 17 and 18 of Table 3. Examples 2 to
An electrophotographic photosensitive member corresponding to No. 6 was prepared and evaluated. The results are shown in Tables 7 and 8 below. (Examples 7 to 10) Component (a) and component (b) at the time of copolymerization
The electrophotographic photoreceptors corresponding to Examples 7 to 10 were prepared and evaluated in the same manner as in Example 1 except that the weight ratio of the above and the weight part of the copolymer were changed as shown in Table 6. The results are shown in Table 7 and Table 8.
Shown in.

[0054]

[Table 6]

[0055]

[Table 7]

[0056]

[Table 8]

Comparative Examples 1 to 4 Comparative Examples 1 to 4 were carried out in the same manner as in Example 1 except that the binder resin shown in Table 9 was used.
Was prepared and evaluated.

[0058]

[Table 9]

The evaluation results are shown in Tables 10 and 11.

[0060]

[Table 10]

[0061]

[Table 11]

Example 11 A polymer A having a constitutional unit represented by the following formula in a binder resin (viscosity average molecular weight 2.0
5 × 10 ⁴ ) 6 parts by weight,

[0063]

[Chemical 15]

It is composed of structural units shown in the following (a) and (b),

[0065]

[Chemical 16]

[0066]

[Chemical 17]

Copolymer B in which component (a) is 50% by weight of the total weight of the copolymer and component (b) is 50% by weight.
(Viscosity average molecular weight 2.80 × 10 ⁴ ) 3 parts by weight and a structural unit represented by the following formulas (a) and (c),

[0068]

[Chemical 18]

[0069]

[Chemical 19]

Copolymer C in which component (a) is 90% by weight of the total weight of the copolymer and component (c) is 10% by weight.
A photoreceptor was prepared and evaluated in the same manner as in Example 1 except that 1 part by weight of (viscosity average molecular weight 2.50 × 10 ⁴ ) was used. The results are shown in Tables 13 and 14 below. (Examples 12 to 15) Polymers A and B in Example 11
A photoconductor was prepared and evaluated in the same manner as in Example 11 except that the weight parts of C and C were changed to the values shown in Table 12. The results are shown in Tables 13 and 14.

[0071]

[Table 12]

[0072]

[Table 13]

[0073]

[Table 14]

[0074]

The electrophotographic photosensitive member of the present invention has the excellent effects of having excellent durability, storage stability, cleaning properties and solvent crack resistance. Further, the effect of the electrophotographic photosensitive member is naturally exhibited in the electrophotographic apparatus and the facsimile equipped with the electrophotographic photosensitive member.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a general transfer type electrophotographic apparatus.

FIG. 2 is a block diagram of a facsimile using the electrophotographic apparatus as a printer.

[Explanation of symbols]

1 Drum type photoconductor as an image carrier (electrophotographic photoconductor of the present invention) 2 Corona charging device 3 Exposure section 4 Developing means 5 Transfer means 6 Cleaning means 7 Pre-exposure means 8 Image fixing means L Light image exposure P Image transfer Received transfer material 9 Image reading unit 10 Controller 11 Reception circuit 12 Transmission circuit 13 Telephone 14 Line 15 Image memory 16 CPU 17 Printer controller 18 Printer

Claims (6)

[Claims] 1. An electrophotographic photosensitive member having a photosensitive layer on a conductive support, wherein the surface layer of the electrophotographic photosensitive member is a structural unit represented by the following formula (1): (In the formula, R _{1 to} R ₈ represent a hydrogen atom, a halogen atom or an alkyl group having 1 to 4 carbon atoms, A and B are optionally substituted alkyl groups, or A and B are condensed together. (Showing a cyclic alkyl group) and a structural unit represented by the formula (2): (Wherein R _{9 to} R ₂₄ represent a hydrogen atom, a halogen atom or an alkyl group having 1 to 4 carbon atoms), and an electrophotographic photosensitive member containing the copolymer. 2. The constitutional unit represented by the formula (1) is represented by the following formula (3): The electrophotographic photosensitive member according to claim 1, wherein 3. A polymer containing a constitutional unit represented by the formula (1), wherein the polymer contains a polymer.
The electrophotographic photosensitive member described. 4. The electrophotographic photosensitive member according to claim 1, further comprising a copolymer having a constitutional unit represented by the formula (1) and the following formula (4). [Chemical 4] (In the formula, R ₂₅ and R ₂₆ are alkylene groups or alkylidene groups having 2 to 6 carbon atoms, R _{27 to} R ₃₀ are alkyl groups having 1 to 3 carbon atoms, phenyl groups or substituted phenyl groups, and n is 1 to 2
Indicates an integer of 0. ) 5. An electrophotographic apparatus provided with the electrophotographic photosensitive member according to claim 1. 6. A facsimile having an electrophotographic apparatus equipped with the electrophotographic photosensitive member according to claim 1 and means for receiving image information from a remote terminal.