JP3364715B2 - Electrophotographic equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic apparatus in which a photoreceptor is prevented from being deteriorated in a storage state before use and in an early stage of use.

[0002]

2. Description of the Related Art For electrophotographic photoreceptors, Se, C
Inorganic materials such as dS and ZnO have been used, but in recent years, electrophotographic photoreceptors using organic materials exhibiting properties comparable to those have been developed and put to practical use. This advantage includes low cost and mass productivity, but deterioration of the material cannot be avoided because it is an organic substance. On the other hand, an undercoat layer, a protective layer, and the like are provided regardless of whether the material is an inorganic material or an organic material. However, since most of them are partially provided with an organic material, it is unavoidable that the material similarly deteriorates. Although much is not known about the deterioration mechanism of such a material, it is possible that it is caused by light irradiation, by passage of electrons, by reactive gas (NOx, SOx, O _3, etc.). It is known to add a specific antioxidant to the photosensitive layer for the purpose of preventing such material deterioration, especially oxidation. For example, JP-A-57-122444 and JP-A-6-
1-156052, JP-A-62-265666, JP-A-63-18356, JP-A-64-44551 and the like. However, in these inventions, the photosensitive layer contains an antioxidant, and from the viewpoint of storage, the antioxidant in the photoconductor is oxidatively deteriorated during the storage period of the photoconductor and cannot be stored. On the contrary, if an excessive amount of antioxidant is added to the photoreceptor, it adversely affects the electrostatic properties during its use, and improvement in this respect has been strongly desired.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electrophotographic apparatus in which an abnormal image does not occur even after being stored in an oxidizing environment. Another object of the present invention is to provide an electrophotographic apparatus which does not cause deterioration of the photoconductor in the initial stage of use. Still another object of the present invention is to provide an electrophotographic apparatus which can realize an inexpensive and effective storage state. Still another object of the present invention is to provide an electrophotographic apparatus which can always realize effective storage regardless of the storage mode.

[0004]

According to the present invention, the following is provided.
An invention is provided. (1)With no contact with the photoconductor,Contains sublimable antioxidants
An electronic photograph characterized by having the members
apparatus. (2) The above-mentioned characterized in that the member is a porous member
The electrophotographic apparatus according to (1). (3) ElectronicA member that does not contact the photoconductor in a photographic device
soUsing a member containing a sublimable antioxidant,
Sensation characterized by attaching an antioxidant to the surface of the optical body
Method of preventing deterioration of optical body. (4)The member is a porous member,
The method for preventing deterioration of a photoreceptor according to (3). That is, an electrophotographic photosensitive member, especially an electrophotographic material containing an organic material as a constituent element.
The sub-photoreceptor has environmental characteristics, especially reactive gases (NOx,
SOx, O_Three, Etc., reduces the chargeability and produces abnormal images.
There is a slippage. The cause of this is clear
No, but presumed to be accompanied by material deterioration
It On the other hand, in order to prevent such oxidative deterioration of the photoconductor,
Adding an antioxidant to the light layer can, as described above,
Although it is well known, it is not
Oxidizing / deteriorating the antistatic agent, resulting in electrostatic adverse effects when actually using the photoconductor
A large amount of acid is used to affect the sound and, conversely, to improve the shelf life.
When an antioxidant is added to the photosensitive layer, in terms of electrostatic characteristics during use,
For example, side effects such as generation of residual potential will occur.

The present inventors, in a state of non-contact with the photoreceptor ,
The present invention was completed by discovering that the above problems can be solved by an electrophotographic apparatus characterized in that a member containing a sublimable antioxidant is mounted, and that deterioration of the photoconductor at the initial stage of use can be prevented. Came to do.

A member containing a sublimable antioxidant will be described. This is not included in a usual electrophotographic process and is presented for the first time in the present invention, but if it can be installed without utilizing the space in the electrophotographic process and hindering the operation of the process. The shape, color, etc. are not specified. The member used in the present invention can be used without being specified as long as it satisfies the above conditions and contains a sublimable antioxidant. By using the member of the present invention, a problem that was in question <br/> problems of conventional electrophotographic process is resolved. The method and construction of the (anti-fatigue) member of the present invention will be described below.

The material used as the base of the member of the present invention can contain a sublimable antioxidant and is stable to a certain extent in various environments (it is good if it does not break itself). For example, it is not specified.
Of these, considering the sublimability of the antioxidant, those having a large specific surface area are preferably used, and those having a porous surface, such as generally called foam materials, are preferably used. Foam materials include polystyrene foam, hard urethane foam, soft urethane foam, polyethylene foam, urea foam, and other foamed plastics: rigid foam rubber, foamed chloroprene rubber, etc. foamed rubber: lightweight cellular concrete panels, etc. foamed concrete: foamed aluminum, etc. Foam metal or natural rubber, SBR, chloroprene rubber, polypropylene, polyethylene, EPDM,
EVA, polystyrene, polyvinyl chloride, 6-nylon, polycarbonate, PET, PBT, modified PPO, etc., as a foaming agent, azodicarbonamide, azobisisobutyronitrile, dinitrosopentamethylenetetramine, 4,4'oxybis Benzene sulfonyl hydrazide, paratoluene sulfonyl hydrazide, etc. are added and foamed, etc. are mentioned, but if it is possible to contain an antioxidant and is stable to some extent in various environments, it is specified. Not something. The member of the present invention can be formed by including a sublimable antioxidant when forming these. Specific examples of the sublimable antioxidant are shown in Tables 1 and 2 below.

[0008]

[Table 1]

[0009]

[Table 2]

Further, the photoconductor to which the present invention is applied is not limited to a specific one, and various types can be applied. FIG. 1 shows the most basic photoreceptor, in which a photosensitive layer 12 is provided on a conductive substrate 11 (however, the photosensitive layer 12 here is a single layer), and FIG. ,
(B) is a photoconductor having a photosensitive layer 12 formed by stacking a charge generation layer 121 and a charge transport layer 122 on a conductive substrate 11, and FIG. 3 is a conductive substrate of the photoconductor shown in FIG. 1 or 2. 1
1 and a type in which an intermediate layer 13 is provided between the photosensitive layer 12 and FIGS. 4 (A) and 4 (B) are formed on the photosensitive layer 12 of the photoreceptor shown in FIG. 1, FIG. 2 or FIG. This shows the type in which the protective layer 14 is provided.

The conductive substrate 11 has a volume resistance of 10 ¹³
Those exhibiting conductivity of Ωcm or less, for example, aluminum,
Nickel, chromium, nichrome, copper, silver, gold, platinum and other metals, tin oxide, indium oxide and other metal oxides deposited or sputtered into film or cylindrical plastic, paper coated on aluminum, or aluminum , Aluminum alloys, nickel, stainless steel plates, etc. I. , I. It is possible to use a pipe or the like which has been subjected to surface treatment by cutting, superfinishing, polishing or the like after being made into a liquid pipe by a method such as I, extrusion or drawing.

When the photosensitive layer 12 is of an inorganic type, it may be amorphous Se, CdS, ZnO, Se-Te,
Typical examples are compounds and alloys such as Se-Te-Cl and Se-As, which are formed by vapor deposition or dispersed in a binder resin. The binder resin is the same as the binder resin used as needed in the formation of the organic photosensitive layer described later. Further, the inorganic photosensitive layer may be formed by laminating photosensitive layers having different absorption wavelengths. On the other hand, if the photosensitive layer 12 is an organic type, it goes without saying that the photosensitive layer 12 may be a single layer.

First, the laminated type organic photosensitive layer (consisting of the charge generation layer 121 and the charge transport layer 122) will be described. The charge generation layer 121 is a layer containing a charge generation material as a main material, and if necessary, a binder. Resin may be used. As the binder resin, polyamide, polyurethane, polyester, epoxy resin, polyketone, polycarbonate, silicone resin, acrylic resin, polyvinyl butyral, polyvinyl formal, polyvinyl ketone, polystyrene, poly-N-vinylcarbazole, polyacrylamide and the like are used.

As the charge generating substance, for example, CI Pigment Blue 25 [Color Index (CI) 2
1180], CI Pigment Red 41 (CI21
200), CI Acid Red 52 (CI4510
0), CI Basic Red 3 (CI4521)
0), phthalocyanine-based pigments having a porphyrin skeleton, azo pigments having a carbazole skeleton (described in JP-A-53-95033), and azo pigments having a distyrylbenzene skeleton (JP-A-53-133455). ), An azo pigment having a triphenylamine skeleton (described in JP-A-53-132547), and an azo pigment having a dibenzothiophene skeleton (JP-A-54-217).
28), azo pigments having an oxadiazole skeleton (described in JP-A-54-12742), and azo pigments having a fluorenone skeleton (JP-A-54-2283).
4), an azo pigment having a bisstilbene skeleton (described in JP-A-54-17733), and an azo pigment having a distyryloxadiazole skeleton (JP-A-54).
No. 2129), an azo pigment having a distyrylcarbazole skeleton (described in JP-A No. 54-17734), and CI Pigment Blue 16 (CI).
74100) and the like, phthalocyanine-based pigments such as CIABAT BROWN 5 (CI73410), and indigo-based pigments such as CI Bad Dye (CI73030), berylylene such as Argos Scarlet B (Violet) and Indance Scarlet R (Bayer) System pigments and the like. Among these charge generating substances, the azo pigment is preferable.

These charge generating substances may be used alone or in combination of two or more. The binder resin is appropriately used in an amount of 0 to 100 parts by weight, preferably 0 to 50 parts by weight, based on 100 parts by weight of the charge generating substance. The charge generation layer 121 is a ball mill, an attritor, a sand mill, or the like in which a charge generation material is dispersed together with a binder resin, if necessary, using a solvent such as tetrahydrofuran, cyclohexane, dioxane, or dichloroethane,
It can be formed by appropriately diluting the dispersion liquid and applying it. The coating can be performed by using a dip coating method, a spray coating method, a bead coating method, or the like. Charge generation layer 12
The film thickness of 1 is appropriately 0.01 to 5 μm, and preferably 0.1 to 2 μm.

The charge transporting layer 122 can be formed by dissolving or dispersing a charge transporting substance and a binder resin in a suitable solvent, applying the solution onto the charge generating layer 121, the conductive substrate 11 or the intermediate layer 13 and drying. . If necessary, a plasticizer, a leveling agent, etc. may be added.
The charge transport material includes a hole transport material and an electron transport material.

As the hole-transporting substance, poly-N-vinylcarbazole and its derivative, poly-γ-carbazolylethylglutamate and its derivative, pyrene-formaldehyde condensate and its derivative, polyvinylpyrene, polyvinylphenanthrene, and oxazole derivative. ,
Oxadiazole derivative, imidazole derivative, triphenylamine derivative, 9- (p-diethylaminostyryl) anthracene, 1,1-bis- (4-dibenzylaminophenyl) propane, styrylanthracene, styrylpyrazoline, phenylhydrazones, Examples thereof include electron donating substances such as α-phenylstilbene derivatives and benzidine derivatives.

Examples of the electron transporting substance include chloranil, bromanyl, tetracyanoethylene, tetracyanoquinone dimethane, 2,4,7-trinitro-9-
Fluorenone, 2,4,5,7-tetranitro-9-fluorenone, 2,4,5,7-tetranitroxanthone, 2,4,8-trinitrothioxanthone, 2,6,6
Examples thereof include electron-accepting substances such as 8-trinitro-4H-indeno [1,2-b] thiophen-4-one and 1,3,7-trinitrodibenzothiophene-5,5-dioxide. These charge transport materials may be used alone or in admixture of two or more.

As the binder resin, polystyrene, styrene-acrylonitrile copolymer, styrene-butadiene copolymer, styrene-maleic anhydride copolymer, polyester, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate , Polyvinylidene chloride, polyarylate resin, phenoxy resin, polycarbonate,
Cellulose acetate resin, ethyl cellulose resin, polyvinyl butyral, polyvinyl formal, polyvinyl toluene, poly-N-vinylcarbazole, acrylic resin,
Examples thereof include thermoplastic or thermosetting resins such as silicone resin, epoxy resin, melamine resin, urethane resin, phenol resin, and alkyd resin. As the solvent, tetrahydrofuran, dioxane, toluene, monochlorobenzene, dichloroethane, methylene chloride or the like is used. A suitable thickness of the charge transport layer 122 is about 5 to 50 μm.

Next, the case where the organic photosensitive layer 12 has a single layer structure (single-layer organic photosensitive layer) will be described. In this case as well, in most cases, a function-separated type of charge-generating substance and charge-transporting substance is used. That is, the compounds shown above can be used as the charge generating substance and the charge transporting substance.

The single-layer organic photosensitive layer can be formed by dissolving or dispersing the charge-generating substance, the charge-transporting substance and the binder resin in a suitable solvent, coating and drying the solution. Further, if necessary, a plasticizer, a leveling agent, etc. can be added. As the binder resin, the binder resin mentioned above in the charge transport layer 122 may be used as it is, or the binder resin mentioned in the charge generation layer 121 may be mixed and used.

The single-layer organic photosensitive layer is a dip coating method or a spray coating method in which a charge generating substance, a charge transporting substance and a binder resin are dispersed in a dispersing machine using a solvent such as tetrahydrofuran, dioxane, dichloroethane or cyclohexanone. It can be formed by coating with a bead coat or the like.
The film thickness of the single-layer organic photosensitive layer is appropriately about 5 to 50 μm.

The electrophotographic photoconductor is shown in FIGS.
As seen in (B), the conductive substrate 11 and the photosensitive layer 12
By providing the intermediate layer 13 between and, the effect as a photoconductor can be further improved, and the adhesiveness can also be improved.

[0024] in the intermediate layer 13, Si O, depositing an inorganic material such as Al ₂ O _2, and those provided by the sputtering method such as anodic oxidation, a polyamide resin (JP 58-3075
7, JP-A-58-98739, etc.),
Alcohol-soluble nylon resin (JP-A-60-1967)
66), a water-soluble polyvinyl butyral resin (described in JP-A-60-232553), a polyvinyl butyral resin (described in JP-A-58-106549), and a resin layer such as polyvinyl alcohol. You can This intermediate layer 13 has ZnO, TiO ₂ , Z
Pigment particles such as nS may be dispersed in an appropriate amount, and a silane coupling agent, a titanium coupling agent, a chromium coupling agent or the like may be used as the intermediate layer 13. The thickness of the intermediate layer 13 is preferably 0 to 5 μm.

In the above-mentioned photoreceptors, a protective layer 14 is provided on the photosensitive layer 12 if necessary (FIG. 4).
(A), (B)). The resin used for the protective layer 14 is ABS resin, ACS resin, olefin-vinyl copolymer resin, chlorinated polyether, allyl resin, phenol resin, polyacetal, polyamide, polyamideimide, polyarylate, polyallylsulfone, polybutylene. , Polybutylene terephthalate, polycarbonate,
Polyether sulfone, polyethylene, polyethylene phthalate, polyimide, methacrylic resin, polymethylpentene, polypropylene, polyphenylene oxide, polysulfone, polystyrene, AS resin, butadiene-styrene copolymer resin, polyurethane, polyvinyl chloride, polyvinylidene chloride, epoxy resin, etc. Is mentioned.

From the viewpoint of abrasion resistance, polytetrafluoroethylene resin, fluorine resin, and silicone resin are added to the protective layer 14 as additives to reduce the friction coefficient and improve abrasion resistance and scratch resistance. In addition, abrasion resistance is improved even when an inorganic compound such as titanium oxide, an oxide, or potassium titanate is dispersed in the resin. Protective layer 14
Has a thickness of 0.5 to 10 μm, preferably 1 to 5 μm.

[0027]

EXAMPLES The present invention will be described in more detail below with reference to examples.

[0028]Example 1 Polyethylene terephthalate film deposited with aluminum
A charge generation layer coating solution of the following composition on the film, charge transport layer
The coating liquid is applied and dried sequentially, and each has a thickness of 0.2 μm.
The generation layer and the charge transport layer having a thickness of 22 μm are formed to realize the present invention.
An electrophotographic photoreceptor was created. [Charge generation layer coating liquid] 4 parts of charge generation material with the following structural formula

[Chemical 1] Cyclohexanone 200 parts 2-butanone 150 parts [Charge Transport Layer Coating Liquid] 7 parts of the charge transport material having the following structural formula

[Chemical 2] Polyarylate (U-100, Unitika Ltd.) 9 parts Tetrahydrofuran 80 parts The photoreceptor thus prepared was belt-joined to obtain a mounting photoreceptor. Next, the structure of the members will be described. Compound No (X) -1 sublimable antioxidant 50 parts AIBN 5 parts Polystyrene raw material 100 parts A mixture of 100 parts or more is heated and melted at 100 ° C. in an extruder,
It was extruded into the air, foamed, cut, and molded into a predetermined shape and dimension. The photoconductor and the member were mounted on a copying machine FT2050, and a running test of 3000 sheets was conducted. (25
C , 60% RH). The evaluation was performed on the 3000th image.

[0029]Comparative Example 1 Example 1 Other than not adding sublimable antioxidant from the parts
Was evaluated in exactly the same way.Example 1When using the member
Gives a good image on the 3000th sheet as well as the 1st sheet.
I gotComparative Example 1In the case of, soiling occurred.

[0030]Example 2 Polyethylene terephthalate with Hastelloy conductive layer
On the film, apply the undercoating layer coating composition and the charge generation layer coating composition shown below.
Apply the coating liquid and the charge transport layer coating liquid in sequence and dry each
2 μm undercoat layer, 0.3 μm charge generation layer and 18
By forming a charge transporting layer of μm, the electrophotographic photoreceptor of the present invention can be obtained.
Created. [Undercoat layer coating liquid] Titanium dioxide 10 parts Polyester (Toyobo Co., Ltd. Byron 200) Part 1 Toluylene-2,4-diisocyanate 0.2 parts 2-butanone 100 parts 4-methyl-2-pentanone 70 parts [Charge generation layer coating liquid] 4 parts of charge generation material with the following structural formula

[Chemical 3] Polyvinyl butyral resin 1 part (Denka Butyral # 4000-1 manufactured by Denki Kagaku Kogyo Co., Ltd.) Cyclohexanone 300 parts 2-Butanone 50 parts [Charge transport layer coating liquid] Charge transport substance of the following structural formula 9 parts

[Chemical 4] Polycarbonate (Panlite K-1300 manufactured by Teijin Kasei Co., Ltd.) 10 parts Tetrahydrofuran 80 parts The above-prepared photoreceptor was belt-joined to obtain a mounting photoreceptor. Next, the structure of the members will be described. Compound No coated molded a mixture sublimable antioxidant 40 parts polyvinyl chloride 100 parts azodicarbonamide 5 parts or more (X) -20 which was heated and melted at 130 ° C. in a hollow polypropylene container. The photoconductor and the members were mounted on an apparatus modified so that a surface electrometer could be set on the black solid portion of the copying machine FT2050 immediately before the developing portion. A running test of 4000 sheets was performed under the environment of 30 ° C. and 90%. For evaluation, the surface potentials of the first and 4000th sheets were measured.

[0031]Comparative example 2 Example 2 The same evaluation is performed except that the components of
Got the result.

[Table 3]

[0032]Example 3 A charge generation layer of the following composition on a φ80 Al cylindrical support
Coating solution, charge transport layer coating solution and protective layer coating solution
0.2 μm charge generation layer after coating and drying, 20 μm each
Of the present invention to form a charge transport layer and a protective layer of 5 μm.
An electrophotographic photoreceptor was created. [Charge generation layer coating liquid] 3 parts of charge generation material with the following structural formula

[Chemical 5] Polyvinyl butyral (XYHL, XYHL) 0.5 part Cyclohexanone 100 parts Tetrahydrofuran 100 parts [Charge Transport Layer Coating Liquid] 8 parts charge transport material having the following structural formula

[Chemical 6] Polyester (Vylon 200 manufactured by Toyobo Co., Ltd.) 10 parts Tetrahydrofuran 70 parts [Protective layer coating liquid] Styrene-methyl methacrylate-2-hydroxyethyl methacrylate-trifluoroethylene methacrylate copolymer 70 parts Conductive titanium oxide 90 parts Toluene 220 parts n-butanol 60 parts Next, the constitution of the members will be described. Compound No (X) -16 sublimable antioxidant 30 parts Chloroprene rubber 80 parts Dinitrosopentamethylene latramine 5 parts A mixture of 5 parts or more was heated to 120 ° C. and then molded by pressure molding. The photoconductor and member are copied and re-copyed FT4
The test piece was mounted on 820, and a running test of 10,000 sheets was performed under the environment of 30 ° C. and 90%. Evaluation is 1st sheet, 100
The 0th image was evaluated.

[0033]Comparative Example 3 Example 3 Except that the sublimable antioxidant was removed from the
Was evaluated.Example 3The image is the first 1000
Although the 0th image gave a good image,Comparative Example 3in the case of,
Image deletion occurred on the 10000th sheet.

[0034]Example 4 A charge generation layer of the following composition on a φ60 Al cylindrical support
Coating solution, charge transport layer coating solution and protective layer coating solution
0.2 μm each charge generation layer after coating and drying, 19 μm
Of the present invention to form a charge transport layer and a protective layer of 3 μm.
An electrophotographic photoreceptor was created. [Charge generation layer coating liquid] 4 parts of charge generation material with the following structural formula

[Chemical 7] Polyvinyl butyral (Sekisui Chemical Co., Ltd. S-REC BM-S 2 parts Toluylene-2,4-diisocyanate 0.1 part Cyclohexanone 400 parts 2-Butanone 100 parts [Charge transport layer coating liquid] Charge transport material having the following structural formula 9 copies

[Chemical 8] Polycarbonate (manufactured by Teijin Chemicals Ltd., Panlite K-1300) 11 parts Methylene chloride 80 parts [Protective layer coating liquid] Styrene-methyl methacrylate-3-hydroxypropyl trimethoxysilane copolymer 80 parts Tin oxide 90 parts Toluene 170 parts 2-butanone 100 parts Next, the structure of the members will be described. Compound No (X) -3 sublimable antioxidant 20 parts SBR 70 parts Paratoluenesulfonyl hydrazide 6 parts After mixing, the mixture was molded by pressure molding. The photoconductor and the member were mounted on a laser printer LP1060-sp3, and a running test of 7,000 sheets was performed under the environment of 15 ° C. and 30%. The evaluation was performed on the 7,000th image.

[0035]Comparative Example 4 Example 4 Same evaluation except that the parts of
It wasExample 4As for the image, the 7000th image is good as well as the 1st image
Gave a good image,Comparative Example 4If the cleaning
The deterioration of the blade causes chipping and black streaks occur in the image.
It was

[0036]Example 5 Example 3 On the same substrate as the
Apply the charge generation layer coating liquid and the charge transport layer coating liquid sequentially.
Dried 0.3μm undercoat layer and 0.2μm charge respectively
A green layer and a charge transport layer having a thickness of 20 μm are formed, and the charge transfer layer of the present invention is formed.
A child photoconductor was created. [Undercoat layer coating liquid] 25% aqueous solution of water-soluble polyvinyl butyral (Sekisui Chemical Co., Ltd. S-REC W-201) 50
Department 150 parts of water 200 parts of methanol [Charge generation layer coating liquid] 5 parts of charge generation material with the following structural formula

[Chemical 9] Polyester (Byron 200 manufactured by Toyobo Co., Ltd.) 2
Parts Toluylene-2,4-diisocyanate 0.1 parts Tetrahydrofuran 200 parts 4-Methyl-2-pentanone 300 parts [Charge transport layer coating liquid] Charge transport material having the following structural formula 8 parts

[Chemical 10] Polycarbonate (Panlite L-1250 manufactured by Teijin Chemicals Ltd.) 10 parts Tetrahydrofuran 70 parts Next, the constitution of the members will be described. Compound No (X) -7 sublimable antioxidant 40 parts Polyethylene 100 parts Foaming agent (FE-507, Eiwa Chemical Industry) After mixing 7 parts or more, it was molded by extrusion molding. The photoconductor and the members were mounted on a copier Recopy FT4820. Thirty
A running test of 10,000 sheets was performed at 90 ° C. and 90%. The evaluation was carried out by the I.D. D. Was measured with a commercially available Macbeth densitometer.

[0037]Comparative Example 5 Example 5 All except that the antioxidant was removed from the
Thus, the following results were obtained.

[Table 4]

[0038]

By repeatedly using the electrophotographic apparatus of the present invention, it is possible to suppress a decrease in charging potential without impairing high sensitivity. That is, in the positive-positive development, it is possible to prevent the image density from decreasing, and in the negative-negative development, it is possible to prevent the background portion from being stained. Further, since the electrophotographic apparatus of the present invention is excellent in environment resistance (reaction gas resistance) in a copying machine or the like, it has high durability and can prevent abnormal images from occurring.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a single-layer type electrophotographic photosensitive member to which the present invention is applied.

2A and 2B are schematic cross-sectional views of a laminated electrophotographic photosensitive member which is the object of the present invention.

FIG. 3 is a schematic cross-sectional view of an electrophotographic photosensitive member provided with an intermediate layer which is a target of the present invention.

4A and 4B are schematic cross-sectional views of an electrophotographic photosensitive member provided with a protective layer which is a target of the present invention.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-303475 (JP, A) JP-A-2-176690 (JP, A) JP-A-5-181298 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) G03G 21/00 G03G 21/10-21/12

Claims (4)

(57) [Claims] 1. An electrophotographic apparatus comprising a member containing a sublimable antioxidant in a non-contact state with a photoconductor . 2. The electrophotographic apparatus according to claim 1, wherein the member is a porous member. 3. A non-contact type photoconductor in an electrophotographic apparatus.
A method for preventing deterioration of a photoconductor, comprising using a member containing a sublimable antioxidant, and depositing the antioxidant on the surface of the electrophotographic photoconductor. 4. The method for preventing deterioration of a photosensitive member according to claim 3, wherein the member is a porous member.