JP3365456B2 - Electrophotographic photoreceptor, electrophotographic apparatus and apparatus unit equipped with the electrophotographic photoreceptor - Google Patents

Description

Detailed Description of the Invention

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

[0002]

2. Description of the Related Art In recent years, various electrophotographic photoconductors have been developed and are mounted on copying machines and printers. However, one of the major drawbacks of these electrophotographic photosensitive members has been their low durability. Durability is roughly classified into sensitivity, residual potential, chargeability, durability of electrophotographic characteristics such as image blur and background fog, and mechanical durability such as abrasion and scratches on the surface of the photoreceptor due to rubbing. In particular, inferior mechanical durability is a major factor in determining the life of the photoconductor, and development of an electrophotographic photoconductor having more excellent mechanical durability is desired. The surface layer of the electrophotographic photoconductor is filming, fusion, and low molecular weight charge transport due to adhesion of a low resistance substance generated by ozone generated during corona charging under high humidity, or toner cleaning failure. It has a factor of causing image deterioration due to deposition of substances, and therefore, in addition to the mechanical durability described above, releasability for various kinds of deposits is required. In order to meet such requirements, that is, to improve mechanical durability against abrasion and scratches, and also to add releasability and water repellency, and to prevent toner fusion and the like, a lubricant is added to the photoreceptor surface layer. It is known that it is effective when dispersed in.

On the other hand, the surface of the photoconductor is constantly deteriorated by ozone generated during corona charging, and it is necessary to polish the surface of the photoconductor to obtain a new surface in order to obtain a high quality image. In particular, if the polishing action is insufficient, the image is crushed as it is durable, and characters are unreadable, so-called image blurring occurs. The conventional electrophotographic photosensitive member has poor mechanical durability, so that the surface of the photosensitive member is appropriately scraped along with durability, and a new surface always appears, so that image blur hardly occurs. However, in the photoconductor in which the lubricant is dispersed, the mechanical durability is improved, and as a result, the amount of abrasion of the photoconductor surface is significantly reduced, so that the deteriorated surface layer is not abraded and image blurring occurs with the durability. The current situation is that it is difficult to put a highly durable photoreceptor into practical use.

On the contrary, if the above-mentioned polishing action is excessively large, especially when the surface layer is a charge transport layer, the surface layer is abraded to lower the charging ability, increase the dark decay, increase the residual potential, etc.
There is a problem that the potential becomes unstable, the sensitivity decreases, the contrast potential cannot be sufficiently obtained, and the background fog occurs on the image as it is durable, and it is extremely difficult to control scraping and lubricity. It was the current situation.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a high-quality image which has durability against surface abrasion due to rubbing, scratches, and the like, and which is free from image blur. To provide an electrophotographic photosensitive member having durability, to provide an electrophotographic photosensitive member having good cleaning property and having high durability without toner adhesion to a surface layer of the photosensitive member, in a repeated electrophotographic process. It is an object of the present invention to provide an electrophotographic photosensitive member having high durability, which is free from deterioration of charging ability, deterioration of sensitivity, and accumulation of residual potential, and which can always obtain a high-quality image without image blur and background fog. Another object is to provide an electrophotographic apparatus equipped with the electrophotographic photosensitive member.

[0006]

The present invention relates to an electrophotographic photosensitive member having a photosensitive layer on a conductive support, which contains a lubricant in the surface layer of the photosensitive layer and has the following general formula (1): And an electrophotographic photosensitive member characterized by containing a compound represented by the following formula and a compound represented by the following general formula (2). General formula (1)

[Chemical 5] (Where R₁Represents a di-lower alkylamino group, R_TwoIs
A hydrogen atom or a di-lower alkylamino group is shown.) General formula (2)

[Chemical 6] (In the formula, R ₁ and R ₂ represent a hydrogen atom, an alkyl group or an alkoxy group, R ₃ represents an alkyl group, an alkoxy group or a benzyl group, R ₄ represents a hydrogen atom, an alkyl group or an alkoxy group, R 4 ₅ is an alkyl group which may have a substituent ants - shows a group or a benzyl group).

[0007] Specific examples of the di-lower alkylamino group represented by R ₁ and R ₂ in the general formula (1) dimethylamino, include groups diethylamino, R _1, R ₂ in the general formula (2) Examples of the alkyl group represented by R ₃ , R _4, and R ₅ include groups such as methyl and ethyl,
Examples of the alkoxy group represented by R ₁ , R ₂ , R ₃ and R ₄ include groups such as methoxy and ethoxy, and examples of the aryl group represented by R ₅ include groups such as phenyl and naphthyl.
Examples of the substituent include an alkyl group such as methyl and ethyl, an alkoxy group such as methoxy and ethoxy, and a halogen atom such as a fluorine atom and a chlorine atom. Tables 1 to 3 show typical examples of the above compounds.

[Table 1]

[Table 2]

[Table 3]

In the electrophotographic photoreceptor of the present invention, a lubricant is used in combination with the compound represented by the general formula (1) and the compound represented by the general formula (2) to impart lubricity to the surface of the photoreceptor. Thus, mechanical damage such as abrasion and scratches in the cleaning process is prevented, and releasability and water repellency are exhibited. By using these materials together, the lubricity and chemical durability are improved, the amount of abrasion is smaller than that of the conventional one, and it is moderately shaved to the extent that filming and adhesion does not occur, and it has an appropriate degree of slipping. It was possible to form an electrophotographic photosensitive member having a good balance and the surface of the electrophotographic photosensitive member, whereby a high-quality image free from background fog and image blur could be obtained.

Typical lubricants used in the present invention are:
For example, fluorine resin powder, polyolefin resin powder,
Lubricating resin powder such as silicone resin powder and fluorocarbon
Examples thereof include bon and the like, and fluororesin powder is particularly preferable.

Examples of the fluorine resin powder include tetrafluoroethylene resin powder, trifluorochloroethylene resin powder,
Hexafluoroethylene propylene resin powder, vinyl fluoride resin powder, vinylidene fluoride resin powder, fluorinated dichloroethylene resin powder and copolymers thereof and the like can be mentioned. One of these or More than that is selected appropriately,
Particularly, tetrafluoroethylene resin powder and vinylidene fluoride resin powder are preferable.

Examples of polyolefin resin powders include homopolymer resin powders such as polyethylene resin powder, polypropylene resin powder, polybutene resin powder, polyhexene resin powder, ethylene-propylene copolymer, ethylene- Copolymer resin powders such as butene copolymers, terpolymers of these with hexene and the like, and polyolefin resin powders such as heat-modified products thereof, and the like. One or more may be appropriately selected, but polyethylene resin powder and polypropylene resin powder are particularly preferable.

The molecular weight of the resin and the particle size of the powder can be appropriately selected, but the particle size is particularly 0.1-10.
μm is preferred. A dispersant may be added to the resin in order to uniformly disperse these lubricants.

When a low molecular weight charge transport substance that cannot be formed into a film is used when forming a photosensitive layer in which a lubricant is dispersed, a resin having a film forming property is used as a binder. The binder resin alone has a certain degree of hardness, and does not interfere with carrier transportation.
Polycarbonate resins such as bisphenol type A polycarbonate and bisphenol Z type polycarbonate are preferred, and bisphenol Z type polycarbonate is particularly preferred.

The weight average molecular weight of the binder resin is optimally 20,000 to 150,000 in consideration of coatability.

The content of the lubricant dispersed in the binder resin is 1 to 1 in terms of the weight fraction of the photosensitive layer containing the lubricant in view of the effect of surface modification, light transmission and carrier mobility. 5
0% by weight is suitable, and 2 to 15% by weight is particularly preferable.

The photosensitive layer of the electrophotographic photoreceptor of the present invention contains a charge generating substance and a charge transporting substance in the same layer, that is, a so-called single layer type and a charge generating layer containing the charge generating substance and a charge transporting substance. The charge-transporting layer has a charge-transporting layer. The laminated type is further classified into a type having a conductive support, a charge generation layer and a charge transport layer in this order and a type having a conductive support, a charge transport layer and a charge generation layer in this order. The electrophotographic photoreceptor of the present invention is preferably a laminated type, particularly a type in which a charge transport layer is laminated on a charge generation layer.

When the electrophotographic photosensitive member of the present invention is manufactured,
Examples of the conductive support include aluminum, aluminum alloys, copper, zinc, stainless steel, titanium, nickel, indium, gold and platinum. In addition, plastics formed by coating these metals or alloys by vacuum deposition (for example, polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, acrylic resin, etc.)
Alternatively, a support obtained by coating conductive particles with a suitable binder resin on the above-mentioned plastic, metal or alloy support or a support obtained by impregnating conductive particles into plastic or paper can be used. Examples of the shape of the support include a drum shape and a belt shape, but it is preferable to make the shape most suitable for the electrophotographic photosensitive member to be applied.

As the conductive particles, particles having conductivity themselves, for example, metal powder (eg, aluminum,
Copper, nickel and silver, etc., metal single fiber, carbon fiber, conductive powder (eg carbon black, titanium black, graphite, antimony oxide as metal oxide and metal sulfide, indium oxide, oxidation) Tin, titanium oxide, zinc oxide, potassium titanate, barium titanate, magnesium titanate, barium sulfate, zinc sulfide,
Copper sulfide, magnesium oxide, aluminum oxide, etc., and their metal oxides or metal sulfides surface-treated with a conductive substance, those surface-treated with a silane coupling agent or titanium coupling agent, and those reduced ) And the like.

An undercoat layer having a barrier function and an adhesive function may be provided between the conductive support and the photosensitive layer. The undercoat layer is casein, polyvinyl alcohol, nitrocellulose, ethylene-acrylic acid copolymer, polyvinyl butyral, phenol resin, polyamide (nylon 6, nylon 66, nylon 610, copolymerized nylon alkoxymethyl). Nylon, etc.), polyurethane,
It can be formed of gelatin, aluminum oxide, polyamic acid, polyimide or the like. The thickness of the undercoat layer is 0.1 to 50 μm, preferably 0.3 to 20 μm.

The charge generation layer comprises azo pigments such as monoazo, disazo and trisazo, phthalocyanine pigments such as metal phthalocyanine and metal-free phthalocyanine, indigo pigments such as indigo and thioindigo, and polycyclic quinone pigments such as anthrone and pyrenequinone. A perylene-based pigment such as perylene anhydride and perylene imide, a squarylium-based dye, a charge generating substance such as pyrylium and thiapyrylium salts or triphenylmethane-based dye, and a binder resin using a suitable solvent, for example, polyvinyl acet
It can be formed by applying a solution dispersed in a resin such as silicone resin, polystyrene, polyester, polyvinyl acetate, methacrylic resin, acrylic resin, polyvinylpyrrolidone or cellulose resin and drying. The thickness of the charge generation layer is 5 μm or less, particularly 0.05 to 2 μm
Is preferred.

For the charge transport layer, a solution of a charge transporting substance selected from the group of compounds represented by the general formulas (1) and (2) is applied to a solution of a resin having film-forming properties and dried. Can be formed by

When the charge transport layer does not serve as the surface layer (including the case where there is a protective layer etc.), the resin having film forming property includes polyester, polycarbonate, polymethacrylic acid ester, polystyrene and the like.

The thickness of the charge transport layer is preferably 5 to 40 μm, more preferably 10 to 30 μm.

In the case of a single layer type, the charge generating substance,
It can be formed by applying a solution in which a charge transport substance and a lubricant are dispersed and dissolved on a conductive support and drying.

Further, an organic photoconductive polymer layer such as polyvinylcarbazol or polyvinylanthracene, a vapor deposition layer of the above-mentioned charge generating substance, a selenium vapor deposition layer, a selenium-tellurium vapor deposition layer, an amorphous silicon layer, etc. are also used as photosensitive layers. Can be used.

In the case of a single layer type, the thickness of the photosensitive layer is 5 to 40.
μm, particularly 10 to 30 μm is preferable.

The above-mentioned various layers may be applied by dip coating, spray coating or spinner coating.
Coating method, beam coating method, myver
A coating method, a roller coating method, a blade coating method and the like can be mentioned.

Further, on the photosensitive layer, durability,
A protective layer containing the lubricant may be provided for the purpose of improving environmental stability. The thickness of the protective layer is 0.2 to 1
0 μm, particularly 0.6 to 6 μm is suitable. As the resin used for the protective layer, polycarbonate, polyester,
Polyarylate, polystyrene, polyurethane, acrylic resin, epoxy resin, silicone resin, cellulose resin, polyvinyl chloride, phosphazene resin, melamine resin, polyamide, polyimide and vinyl chloride-vinyl acetate copolymer. . These resins can be used alone or in combination of two or more kinds. Moreover, when superposing | polymerizing after coating, you may contain the polymerization initiator. Further, in order to control the resistance, the protective layer may contain conductive particles, and may be surface-treated if necessary. Examples of the conductive particles include metals, metal oxides, carbon black and the like. Examples of the surface treatment agent include silane coupling agents, silicone oils, surfactants and the like. Aluminum as the metal,
Examples thereof include zinc, copper, chromium, nickel, stainless steel, silver, and the like, or those obtained by vapor-depositing these metals on the surface of plastic particles. These may be used alone or in combination of two or more. When two or more kinds are used in combination, they may be simply mixed, or may be in the form of solid solution or fusion. Further, the charge transport material may be added if necessary. For the protective layer, beam coating, vacuum deposition or the like can be used in addition to the above method.

The electrophotographic photosensitive member of the present invention is used in a copying machine, a laser.
The present invention can be applied to general electrophotographic devices such as printers, LED printers, liquid crystal shutter-type printers, etc., but also to devices such as displays, recording, light printing, plate making and facsimiles to which electrophotographic technology is applied. It can be widely applied.

Further, the present invention comprises an electrophotographic apparatus and an apparatus unit provided with the electrophotographic photosensitive member of the present invention.

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, and a shaft 1
It is rotationally driven around a at a predetermined peripheral speed in the arrow direction.
The photosensitive member 1 is uniformly charged at its peripheral surface by a charging unit 2 at a predetermined positive or negative potential in the course of its rotation, and then at an exposure unit 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 rotated by the transfer means 5 from a paper feeding portion (not shown) between the photosensitive body 1 and the transfer means 5. Then, the image is sequentially transferred onto the surface of the transfer material P that is fed in synchronization with the above. 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 image fixing and printed out as a copy (copy). The surface of the photoconductor 1 after the image transfer is cleaned by the cleaning means 6 by removing the transfer residual toner, and is subjected to the charge removal processing by the pre-exposure means 7 to be repeatedly used for image formation. 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 an electrophotographic apparatus, a plurality of constituent elements such as the photoconductor, the developing unit, and the cleaning unit described above are integrally combined as an apparatus unit, and the unit is detachably attached to the apparatus main body. It may be configured. For example, the photosensitive member 1 and the cleaning means 6 may be integrated into one device unit, and the device body may be detachable by using a guide means such as a rail. At this time, the above-mentioned apparatus unit may be configured with a charging means and / or a developing means. 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 the original is read and converted into a signal by a laser. -Beam scanning,
This is performed by driving the light emitting diode array or the liquid crystal shutter array.

[0032]

EXAMPLES Comparative Example 1 An aluminum cylinder was used as a conductive support, and
A 5% methanol solution of polyamide resin (trade name: Amilan CM-8000, manufactured by Toray Industries, Inc.) is applied by a dip coating method and dried at 90 ° C. for 10 minutes to form an undercoating layer having a thickness of 0.45 μm. did.

Next, the following disazo pigments

[Chemical 7] 90 parts of tetrahydrofuran was added to 5 parts and dispersed by a sand mill for 22 hours. Butyral resin (trade name B
A solution prepared by dissolving 2.5 parts of LS and Sekisui Chemical Co., Ltd. in 20 parts of tetrahydrofuran was added, and further dispersed for 3 hours. A liquid obtained by adding 95 parts of cyclohexanone and 105 parts of tetrahydrofuran to this dispersion and diluting it is applied on the previously formed undercoat layer and dried at 80 ° C. for 10 minutes to form a charge generation layer having a thickness of 0.15 μm. did.

Next, 20 parts of polycarbonate (weight average molecular weight: 55,000, manufactured by Teijin Chemicals Ltd.) and a charge-transporting substance having the following structural formula

[Chemical 8] Polytetrafluoroethylene powder (trade name: Lubron L-2, manufactured by Daikin Industries, Ltd.) 6 was prepared by dissolving 20 parts in 100 parts of chlorobenzene and adding fluororesin powder as a lubricant to this.
Parts and disperse for 50 hours with a stainless steel ball mill,
Furthermore, 20 parts of dichloroethane was added to prepare a coating solution for the charge transport layer, and this solution was applied onto the previously formed charge vocalization layer and dried with hot air at 100 ° C. for 90 minutes to form a charge transport layer having a thickness of 20 μm. did. The produced electrophotographic photosensitive member is referred to as a comparative photosensitive member 1.

A copying machine (commercial name NP-3525, Canon) in which the comparative photoconductor 1 was modified so that the blade penetration amount (the length by which the blade presses the photoconductor and bends) was 1.0 mm and the relative speed of the sponge roller was 106%. (Manufactured by Co., Ltd.), and image evaluation and durability evaluation were performed.

The comparative photoconductor 1 was free from image blurring and background fog even after running 200,000 sheets, and a high quality copy was obtained.
The amount of decrease in the photoconductor film thickness at this time was 1.8 μm.

Further, the comparative photoconductor 1 was heated at high humidity and high temperature (32.5
Durability of 10,000 sheets was carried out in (° C., 90% RH), but image deletion did not occur at all, and a high-quality image was obtained.

Comparative ExampleThirteen Comparison Instead of the charge transport material in Example 1,
Charge transport material

[Chemical 9] An electrophotographic photosensitive member was prepared in the same manner as in Comparative Example 1 except that the above was used, and the comparative photosensitive member 13 was subjected to the same image evaluation and durability evaluation. Image blurring did not occur at the durability of 100,000 sheets, but background fog occurred. At this time, the amount of decrease in the photoreceptor film thickness was 6.0 μm.

[0039]ComparisonExample 26, Examples 1-3 Combination of charge transport material and lubricant as shown in Table 4.
Other than the above, the same electrophotographic photosensitive material as in Comparative Example 1 was obtained.
Create the body,ComparisonPhotoconductor 26, photoconductors 1-3And the same
Image evaluation and durability evaluation were performed in the same manner. The results are shown in Table 5.
You

[0040]

[Table 4]

[0041]

[Table 5]

Comparative Example14 Comparative exampleThirteenIn place of polytetrafluoroethylene powder in
Comparative example except that polypropylene powder was usedThirteenSame as
An electrophotographic photoreceptor was prepared in the same manner, and a comparative photoreceptor14When
Then, image evaluation and durability evaluation were performed in the same manner. Durability 90,000 sheets
Image blur did not occur, but background fog occurred and
At that time, the amount of decrease in the photoreceptor film thickness was 5.6 μm.

Comparative Examples 15 to 16 Electrophotographic photosensitive members were prepared in the same manner as in Comparative Example 1 except that polytetrafluoroethylene powder was not used in Comparative Example 1.
Let this be a comparative photoconductor 15.

[0044] Other using no polytetrafluoroethylene powder in Example 1 creates an electrophotographic photoreceptor in the same manner as in Example 1, and Comparative photosensitive member 16.

When the comparative photoconductors 15 and 16 were mounted on the modified copying machine and subjected to durability in high temperature and high humidity (32.5 ° C., 90% RH), the photosensitive layer showed releasability. Since it was not present, it was difficult to remove the paper dust and the like adhering to the surface, and image deletion occurred in about 10,000 sheets in each case.

[0046]Comparison An example7~10, Examples 4-5 Combination of charge transport material and lubricant as shown in Table 6
Other than the above, the same electrophotographic photosensitive material as in Comparative Example 1 was obtained.
Create the body,ComparisonPhotoconductor7~10, photoconductors 4-5age,
Similarly, image evaluation and durability evaluation were performed. The results are shown in Table 7.
You

[Table 6]

[Table 7]

Comparative Example 17 Instead of the charge transport material in Comparative Example 7, a charge transport material having the following structural formula

[Chemical 10] An electrophotographic photosensitive member was prepared in the same manner as in Comparative Example 7 except that the above was used, and the comparative photosensitive member 17 was subjected to the same image evaluation and durability evaluation. Image blur did not occur at the durability of 90,000 sheets, but background fog occurred. At this time, the reduction amount of the photoconductor film thickness was 4.8 μm. Further, it was mounted on the modified copying machine and was subjected to durability in high temperature and high humidity (32.5 ° C., 90% RH). Background fogging and image deletion occurred at a durability of about 2,000 sheets.

[0048]ComparisonAn example11 10 parts of the disazo pigment used in Example 1, bisphenol
A type polycarbonate (weight average molecular weight 20,000, three
10 parts by Ryora Gas Chemical Co., Ltd. and 50 by dichloromethane
Parts, 50 parts of tetrahydrofuran for 1φ glass beads
It was dispersed for 20 hours with a sand mill.

Next, 20 parts of the polycarbonate resin and 20 parts of the charge transport material used in Example 4 were dissolved in a mixed solvent of 50 parts of dichloromethane and 50 parts of tetrahydrofuran, and 6 parts of polytetrafluoroethylene powder was added thereto. Was added and dispersed by a stainless ball mill for 50 hours. This dispersion was put into the disazo pigment dispersion to prepare a photosensitive layer coating solution. This coating solution was coated on an aluminum cylinder on which an undercoat layer had been formed in the same manner as in Example 1, and 100
The film was dried at 60 ° C. for 60 minutes to form a photosensitive layer having a film thickness of 20 μm, which was used as a comparative photoconductor 11. The image evaluation and the durability evaluation were performed in the same manner. No, a high quality copy was obtained.

[0050]ComparisonAn example12 Comparison In Example 1, polytetrafluoroethylene as the lubricant
Instead of powder, carbon fluoride (Daikin Industries, Ltd.)
Electrophotographic sensitization in the same manner as in Comparative Example 1 except that
A body is prepared and used as a comparative photoconductor 12.

Comparative example18 In Comparative Example 1, as a lubricant, polytetrafluoroethylene
Instead of powder, silicone resin powder (trade name XC-99
-501, manufactured by Toshiba Silicone Co., Ltd.ratio
ComparisonAn electrophotographic photosensitive member was prepared in the same manner as in Example 1, and a comparative photosensitive
body18And

[0052] was performed similarly to image evaluation and a durability evaluation Comparative photoreceptor 12 and comparative photosensitive member 18. Comparative photoconductor 1
In No. 2 , no background fog or image blurring occurred even after running 200,000 sheets, and a high-quality copy was obtained. At this time, the amount of decrease in the photoconductor film thickness was 2.3 μm. On the other hand, the comparative photoconductor 18
Image blur occurred at the endurance of 6,000 sheets. At this time, the amount of decrease in the photoreceptor film thickness was 0.5 μm or less (detection limit). Further, the comparative photoconductor 12 was mounted on the modified copying machine, and was subjected to durability of 10,000 sheets in high temperature and high humidity (32.5 ° C., 90% RH), but no image deletion or background fog occurred. A high-quality image was obtained.

[0053]

In the electrophotographic photoreceptor of the present invention, by adding a lubricant and a specific charge-transporting substance to the surface layer of the photoreceptor, mechanical durability is improved and cleaning is performed due to abrasion and scratches on the surface. Good toughness, no toner adhesion, image blurring,
The remarkable effect is that a high-quality image without background fog can be continuously formed.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration example of an electrophotographic apparatus including an electrophotographic photosensitive member of the present invention.

[Explanation of symbols]

1 Electrophotographic photoreceptor of the present invention 1a axis 2 charging means 3 exposure section 4 developing means 5 Transfer means 6 Cleaning means 7 Pre-exposure means 8 Image fixing means L light image exposure Transfer material that received P image transfer

Continuation of front page (56) Reference JP-A-6-273948 (JP, A) JP-A-5-134430 (JP, A) JP-A-5-88388 (JP, A) JP-A-4-284459 (JP , A) JP-A-8-106167 (JP, A) JP-A-8-6266 (JP, A) JP-A-7-64307 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) G03G 5/00-5/16

Claims (7)

(57) [Claims] 1. An electrophotographic photoreceptor having a photosensitive layer on a conductive support, wherein the surface layer of the photosensitive layer contains a lubricant, and the compound represented by the following general formula (1) and the following general formula: An electrophotographic photoreceptor containing the compound represented by (2). General formula (1) (In the formula, R ₁ represents a di-lower alkylamino group, and R ₂ represents a hydrogen atom or a di-lower alkylamino group.) General formula (2) (In the formula, R ₁ and R ₂ represent a hydrogen atom, an alkyl group or an alkoxy group, R ₃ represents an alkyl group, an alkoxy group or a benzyl group, R ₄ represents a hydrogen atom, an alkyl group or an alkoxy group, R 4 ₅ represents an alkyl group, an aryl group which may have a substituent or a benzyl group.) 2. The electrophotographic photosensitive member according to claim 1, wherein the lubricant is selected from the group consisting of fluororesin powder, polyethylene and polypropylene. 3. The electrophotographic photosensitive member according to claim 1, wherein the content of the lubricant is 1 to 50% by weight based on the weight fraction of the photosensitive layer containing the lubricant. 4. A compound represented by the general formula (1) is a compound represented by the following structural formula (1), a compound wherein the compound represented by the general formula (2) is represented by the following structural formula (2) The electrophotographic photosensitive member according to any one of claims 1 to 3. Structural formula (1) Structural formula (2) 5. The electrophotographic photoreceptor according to claim 1, wherein the photosensitive layer has a laminated structure of a charge generation layer and a charge transport layer. 6. An electrophotographic apparatus comprising the electrophotographic photosensitive member according to claim 1. 7. The electrophotographic photosensitive member according to claim 1, and at least one selected from the group consisting of a charging unit, a developing unit and a cleaning unit, which are integrally combined to form an electron. A device unit that is removable from the main body of the photographic device.