JPH0527456A - Photosensitive material and its production - Google Patents

Abstract

PURPOSE:To improve coating workability and to obtain a positive charge photosensitive material having high quality and high durability by successively depositing a charge transfer layer and a charge generating layer and incorporating a silicone oil of specified concn. into the coating liquid used for each layer. CONSTITUTION:On a cylindrical conductive supporting body 1, there are successively provided a charge transfer layer 2 and a charge generating layer 3 to form the photosensitive layer. Each coating liquid used for the charge transfer layer 2 and the charge generating layer 3 contains a silicone oil so that the formed layers 2, 3 contain the silicone oil by the concn. specified by formulae I and II. In formulae I, II, (Q) is the concn. (ppm) of the silicone oil in the charge generating layer 3, while (P) is the concn. of the silicone oil in the charge transfer layer 2. As for the silicone oil, methylphenylsilicone oil is used. At least the charge generating layer 3 is formed by coating the cylindrical conductive supporting body 1 with using a cylindrical coating machine to bring the coating liquid into contact with the supporting body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoreceptor having high image quality and high durability used in electrophotography and a method for producing the same.

[0002]

2. Description of the Related Art In a conventional negatively charged photoreceptor, a charge transport layer forming a surface layer contains silicone oil to improve coating workability and image defects of the photoreceptor caused by coating work. Techniques for improving
Proposed in No. 938. That is, in this publication, a charge generating layer is provided on a film-shaped support, and silicone oil is added to the layer in an amount of 0.001 to 0.5 wt% (10 to 5000 pp) based on the solid content.
m) A photoreceptor provided with a charge transport layer containing is described. In the specific examples of the above publications, it is described that the charge transport layer coating liquid is applied to the charge generation layer by a slit coater.

[0003]

The photoreceptor described in the above publication is a negatively chargeable photoreceptor having a charge generation layer as a lower layer and a charge transport layer as an upper layer, and is negatively charged by a corona discharger during image formation. However, there is a problem that a large amount of ozone is generated when the electric charge is applied, and the environment is deteriorated.Therefore, the photoconductor has a charge transport layer as a lower layer and a charge generation layer as an upper layer, and ozone is less likely to be generated during charging. Development of a charging photoreceptor is desired.

It is generally said that it is not necessary to use a surface smoothing agent such as silicone oil when forming a thin film such as a charge generating layer on a support. That is, since the charge generation layer is usually a thin layer having a thickness of 1 μm or less, after the application of the coating solution, the drying is completed without any time during which the surface property is deteriorated due to a convection phenomenon or the like. Therefore, it is not necessary to use a surface smoothing agent such as silicone oil for preventing the deterioration of the surface property.

On the other hand, when a thick film such as a charge transport layer is formed on a support, the charge transport layer is formed as a surface layer which is required to have good surface properties, as in the case of JP-B-2-46938. If so, the use of a surface smoothing agent such as silicone oil is required. That is, the charge transport layer usually requires a layer thickness of 10 to 30 μm, and drying after coating is prolonged, and a convection phenomenon occurs in the coating film during the drying process to deteriorate the surface property of the photosensitive layer. It is necessary to use a surface smoothing agent such as silicone oil that prevents the phenomenon and contributes to the formation of a smooth surface layer.

Therefore, unlike the case of the photoreceptor described in the above publication, the lower charge generation layer does not contain silicone oil,
By containing silicone oil in the upper charge transport layer, a good coating film can be obtained for both the lower charge generation layer and the upper charge transport layer, and a photoreceptor having excellent electrophotographic characteristics can be obtained. However, according to the experiments conducted by the present inventors, the situation is completely different when a positive charge photoconductor is obtained by providing a charge transport layer as a lower layer and a charge generating layer as an upper layer as countermeasures against ozone. That is, when the coating liquid for charge generation is applied onto the lower layer of the charge transport layer containing silicone oil, the wetness of the coating liquid is poor as it is, and repellency occurs, making it difficult to form a favorable charge generation layer.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned problems and provide a photoreceptor having high image quality and high durability and a method for producing the photoreceptor having excellent coating processability and productivity. .

[0008]

The inventors of the present invention have made extensive studies on this problem, and as a result, the cause of the repellency is that the surface of the charge transport layer as the lower layer and the coating liquid for the charge transport layer to be applied as the upper layer. It was found that there is a mutual relationship with and completed the present invention.

That is, the object of the present invention is to provide an electrophotographic photoreceptor having a photosensitive layer formed by laminating a charge transport layer and a charge generating layer in this order on a conductive support, wherein the charge transport layer and the charge generating layer are provided. Each layer contains silicone oil,
The concentration (ppm) of silicone oil in each layer is expressed by the following formula-
(1) and the formula- (2) are satisfied, and a method for producing the photoconductor, the charge generation layer and the charge transport layer provided on a cylindrical conductive support, respectively. And the coating liquid of
Cylindrical body coating containing a silicone oil having a concentration (ppm) defined in (1) and-(2), and at least coating processing of the charge generation layer is performed by surrounding and contacting the coating liquid with the cylindrical conductive support. It is achieved by a method for producing a photoconductor, which is performed by using a machine.

Formula- (1): [Q] ≧ [P] +1000 Formula- (2): [Q] ≦ 10,000 where [Q] is the concentration (ppm) of silicone oil in the charge generation layer, and [P] is Indicates the concentration (ppm) of silicone oil in the transport layer.

In the embodiment of the present invention, methylphenyl silicone oil is preferable as the silicone oil.

That is, in the photoreceptor of the present invention, a charge transport layer containing silicone oil is provided as a lower layer on a conductive support, and a silicone oil having a higher concentration than the silicone oil of the charge transport layer is provided as an upper layer thereon. Is provided to provide high image quality and high durability.

Further, as a method for producing the photoreceptor of the present invention,
A circular slide hopper coater is used to coat at least the upper charge-generating layer using the coating liquid for the charge-transporting layer and the charge-generating layer related to the inclusion of silicone oil in the cylindrical conductive support described above. A cylindrical body coating machine such as a circular extrusion coating machine or a circular small amount dip coating machine which is excellent in coating processing accuracy and processing efficiency is used.

The silicone oil contained in the charge transport layer and the charge generation layer according to the present invention is selected from, for example, alkyl silicone oil, aryl silicone oil, alkylaryl silicone oil and the like, and the silicone oil is used in the charge transport layer. And in both layers of the charge generation layer.

When it is contained in only one layer, it is possible to prevent coating defects such as cissing, orange peel, uneven coating, streaks and spots when the coating solution for the charge transport layer or the charge generating layer is applied. Can not.

Methylphenyl silicone oil is excellent in preventing the coating defects, and particularly methylphenyl silicone oil having a phenyl group content of 10% to 25% is excellent. Such methylphenyl silicone oil is already commercially available, for example, Shin-Etsu Chemical Co., Ltd.
KF-50, KF-54 and KF-56 manufactured by Toray Silicone Co., Ltd. and TSF431, TSF443 and TSF437 manufactured by Toray Silicone Co., Ltd. are preferably used.
Since these silicone oils have good solubility in the coating liquid, they are uniformly contained in the charge transport layer as the lower layer, and when the charge generation layer coating liquid also containing the silicone oil is applied thereon, The coating solution is spread evenly over the entire surface of the lower layer and is applied to form a uniform thin layer of the charge generation layer without repelling, coating unevenness, coating streaks and the like.

The concentration [Q] of the silicone oil in the charge generation layer is 10,000 ppm or less, preferably 1010 to 1000.
0 ppm, and the concentration [P] of the silicone oil in the charge transport layer is at least 1000 ppm less than the concentration [Q] of the silicone oil in the charge generation layer, preferably 10-9.
It is suppressed to the range of 000ppm.

When the concentration [Q] of the silicone oil in the charge generating layer exceeds 10,000 ppm, liquid dripping occurs and the electrostatic characteristics deteriorate, and when it falls below 1010 ppm, repelling, orange peel, uneven coating, coating streaks, etc. Causes coating defects. Further, when the silicone oil concentration [P] in the charge transport layer exceeds 9000 ppm, dripping occurs and the electrostatic characteristics deteriorate, and when it is less than 10 ppm, coating defects such as orange peel, coating unevenness and coating streaks occur.

The silicone oil concentration [Q] in the charge generation layer is equal to the silicone oil concentration [P] in the charge transport layer.
If the amount is more than 1000 ppm, cissing occurs and it becomes difficult to form a good coating film.

In the production of the photoreceptor, the silicone oil, preferably methylphenyl silicone oil, is applied to the charge generating layer coating liquid and the charge transporting layer coating liquid so as to have the above amount relationship after coating and drying. It is dissolved in and contained. Then, after forming an intermediate layer on the cylindrical support, if necessary, the charge transport layer coating solution is applied by dip coating, spray coating, beam coating, spiral coating, circular slide hopper coating, circular extrusion coating or circular small amount dip coating. To form a charge-transporting layer, and the charge-generating layer coating solution is applied onto the charge-transporting layer by using the cylinder coating machine to form a charge-generating layer.

The cylindrical coater is capable of uniform coating at such a high speed that there is no time to dissolve the lower layer, and particularly when the dispersion is applied in a thin layer like the charge generating layer, the charge generating layer is particularly preferable. Is suitable as a surface layer.

Examples of the charge transport material contained in the charge transport layer according to the present invention include oxazole derivatives,
Oxadiazole derivative, thiazole derivative, thiadiazole derivative, triazole derivative, imidazole derivative, imidazolone derivative, imidazolidine derivative, bisimidazoline derivative, styryl compound, hydrazone compound, pyrazoline derivative, oxazolone derivative, benzothiazole derivative, benzimidazole derivative, quinazoline derivative , Benzofuran derivative, afridine derivative, phenazine derivative, aminostilbene derivative, poly-N-vinylcarbazole, poly-1-vinylpyrene, poly-9-vinylanthracene and the like.

Of the above-mentioned charge-transporting substances, particularly preferred are carbazole derivatives of the general formula (1), hydrazone compounds of the general formulas (2) to (5), pyrazoline derivatives of the general formula (6), and general formula (7). The styryl compound and the amine derivative of the general formula (8).

[0024]

[Chemical 1]

In the general formula (1), R ¹ is a substituted or unsubstituted aryl group, R ² is a hydrogen atom, a halogen atom,
A substituted or unsubstituted alkyl group, an alkoxy group, an amino group, a hydroxyl group, a substituted amino group, R ³ represents a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group.

[0026]

[Chemical 2]

In the general formula (2), R ⁴ and R ⁵ are each a hydrogen atom or a halogen atom, and R ⁶ and R ⁷ are each a
A substituted or unsubstituted aryl group and Ar ¹ represents a substituted or unsubstituted arylene group.

In the general formula (3), R ⁸ is a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group, R ⁹ is a hydrogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted , An aryl group, Q is a hydrogen atom, a halogen atom, an alkyl group, a substituted amino group, an alkoxy group or a cyano group, and p is an integer of 0 or 1.

In the general formula (4), R ¹⁰ is a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group, and R ¹¹ is a hydrogen atom, a substituted or unsubstituted alkyl group or a substituted or unsubstituted alkyl group. An aryl group, X is a hydrogen atom,
Halogen atom, alkyl group, substituted amino group, alkoxy group or cyano group, q represents an integer of 0 or 1.

[0030]

[Chemical 3]

In the above general formula (5), D represents a substituted or unsubstituted phenyl group or a substituted or unsubstituted carbazolyl group.

Specific examples include the above groups.

R ¹² and R ¹³ represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group.

The alkyl group includes a methyl group, an ethyl group, a propyl group, a butyl group and the like, the aralkyl group includes a benzyl group and a phenethyl group, and the aryl group includes a phenyl group and an α-naphthyl group. Examples include β-naphthyl group and the like. As the substituent, a halogen atom,
Examples thereof include alkyl groups, alkoxy groups, substituted amino groups (dimethylamino group, diethylamino group, dipropylamino group, dibenzylamino group) and the like.

R ¹⁴ , R ¹⁵ and R ²¹ are the same as R ¹² and R ¹³ . R ¹⁶ , R ¹⁷ , R ¹⁸ , R ¹⁹ , R ²⁰ , and R ²² represent an alkyl group, an alkoxy group, a halogen atom, or the like.

[0036]

[Chemical 4]

In the general formula (6), l is an integer of 0 or 1, R ²³ , R ²⁴ and R ²⁵ are substituted or unsubstituted aryl groups, R ²⁶ and R ²⁷ are hydrogen atoms, and have 1 to 10 carbon atoms. 4 or a substituted or unsubstituted aryl group or aralkyl group (provided that R ²⁶ and R ²⁷ are not both hydrogen atoms, and when l is 0, R ²⁶ is not a hydrogen atom).
Is.

In the above general formula (7), R ²⁸ and R ²⁹ represent a substituted or unsubstituted alkyl group or phenyl group, and as the substituent, an alkyl group, an alkoxy group or a phenyl group is used. R ³⁰ represents a substituted or unsubstituted phenyl group, naphthyl group, anthryl group, fluorenyl group or heterocyclic group, and as a substituent, an alkyl group, an alkoxy group, a halogen atom, a hydroxyl group or a phenyl group is used. R ³¹ represents a hydrogen atom, a substituted or unsubstituted alkyl group or a phenyl group. R ³² , R ³³ , R ³⁴ and R ³⁵ represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group or an alkylamino group.

In the general formula (8), Ar ² and Ar ³ represent a substituted or unsubstituted phenyl group, and a halogen atom, an alkyl group, a nitro group or an alkoxy group is used as the substituent.

Ar ⁴ is a substituted or unsubstituted phenyl group,
Naphthyl group, anthryl group, fluorenyl group, represents a heterocyclic group, the substituent is an alkyl group, an alkoxy group, a halogen atom, a hydroxyl group, an aryloxy group, an aryl group,
An amino group, a nitro group, a piperidino group, a morpholino group, a naphthyl group, an anthryl group and a substituted amino group are used. However, an acyl group, an alkyl group, an aryl group, or an aralkyl group is used as a substituent of the substituted amino group.

Examples of specific compounds contained in the above general formulas (1) to (8) are, for example, JP-A-60-172044, page 6, lower right column, line 2 to page 21, upper right column, line 20. It is described in.

Next, as the charge generating substance contained in the charge generating layer of the present invention: (1) azo such as monoazo pigment, polyazo pigment, metal complex salt azo pigment, pyrazolone azo pigment, stilbene azo pigment and thiazole azo pigment Pigments (2) Perylene pigments such as perylene anhydride and perylene imide (3) Anthraquinones such as anthraquinone derivatives, anthanthrone derivatives, dibenzpyrenequinone derivatives, pyranthrone derivatives, violanthrone derivatives and isoviolanthrone derivatives, or Polycyclic quinone pigment (4) Indigoid pigment such as indigo derivative and thioindigo derivative (5) Phthalocyanine pigment such as metal phthalocyanine and metal-free phthalocyanine (6) Diphenylmethane pigment, triphenylmethane pigment, xanthene pigment and acridine pigment Carbonyl pigments (7) Quinoneimine pigments such as azine pigments, oxazine pigments and thiazine pigments (8) Methine pigments such as cyanine pigments and azomethine pigments (9) Quinoline pigments (10) Nitro pigments (11) Nitroso Pigments (12) Benzoquinone and naphthoquinone pigments (13) Naphthalimide pigments (14) Perinone pigments such as bisbenzimidazole derivatives. Among the various pigments, particularly preferable charge generating substances are polycyclic quinone pigments represented by the following general formulas (9) to (11).

[0043]

[Chemical 5]

In each of the above general formulas, X represents a halogen atom, a nitro group, a cyano group, an acyl group or a carboxyl group,
n represents an integer of 0 to 4 and m represents an integer of 0 to 6.

As usable charge generating substances, the bisazo compounds represented by the following general formulas (12) to (14) can be used.

[0046]

[Chemical 6]

In the general formula (12), Ar ⁵ and Ar ⁶ are each a substituted or unsubstituted carbocyclic aromatic ring group, or a substituted or unsubstituted heterocyclic aromatic ring group, R ³⁶ and R ^37. Represents an electron-withdrawing group or a hydrogen atom (provided that at least one of R ³⁶ and R ³⁷ is a halogen such as —CN and —Cl, an electron withdrawing group such as —NO ₂ ).

In A, X is --OH group, --N (R ³⁹ )-R ⁴⁰ or --NHSO ₂ R ⁴¹ (R ³⁹ and R ⁴⁰ are respectively a hydrogen atom, a substituted or unsubstituted alkyl group, and R ⁴¹ is A substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group), Y is a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, an alkoxy group, a carboxyl group, a sulfo group, a substituted or unsubstituted carbamoyl group Or a substituted or unsubstituted sulfamoyl group (however, when m is 2 or more, the groups may be different from each other), Z is a substituted or unsubstituted carbocyclic aromatic ring group, or a substituted or unsubstituted the atomic group necessary to configure the heterocyclic aromatic ring group, R ³⁸ is a hydrogen atom, a substituted or unsubstituted amino group, a substituted or unsubstituted carbamoyl group, a carboxyl group or an ester group B is a substituted or unsubstituted aryl group, n is an integer of 1 or 2, m is an integer of 0-4.

A particularly preferable charge generating substance in the general formula (12) is represented by the following general formula (12a).

[0050]

[Chemical 7]

(However, Ar ⁷ , Ar ⁸ and A are the same as those defined in the general formula (12).) More preferred are those in which Ar ⁷ , Ar ⁸ in the general formula (12a) are substituted or It represents an unsubstituted phenyl group, and the substituent is selected from an alkyl group such as a methyl group and an ethyl group, an alkoxy group such as a methoxy group and an ethoxy group, a halogen atom such as a chlorine atom and a bromine atom, a hydroxyl group and a cyano group. It is a compound.

A preferable charge generating substance in the charge generating layer according to the present invention is represented by the following general formula (13).

[0053]

[Chemical 8]

In A, Z is an atomic group necessary for constituting a substituted or unsubstituted aromatic carbocycle or a substituted or unsubstituted aromatic heterocycle, and Y is a hydrogen atom, a hydroxyl group, a carboxyl group or an ester group thereof. , A sulfo group, a substituted or unsubstituted carbamoyl group, or a substituted or unsubstituted sulfamoyl group, R ⁴² represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted amino group, a substituted or unsubstituted carbamoyl group , Carboxyl group or its ester group, or cyano group, Ar
⁹ represents a substituted or unsubstituted aryl group, R ⁴³ represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group.

Of the above general formula (13), the following general formula (13
The bisazo compound having a carbazole group of a) is particularly preferable.

[0056]

[Chemical 9]

However, in this general formula (13a), R ⁴⁴ and R ⁴⁵ are an alkyl group, an alkoxy group or an aryl group, R ⁴⁶ ,
R ⁴⁷ , R ⁴⁸ , R ⁴⁹ , R ⁵⁰ and R ⁵¹ are a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an amino group, a hydroxyl group and an aryl group.

A preferable charge generating substance in the charge generating layer according to the present invention is represented by the following general formula (14).

[0059]

[Chemical 10]

In the general formula (14), X ¹ and X ² are
Halogen atom, substituted or unsubstituted alkyl group, substituted or unsubstituted alkoxy group, nitro group,
It represents a cyano group, a hydroxy group or a substituted or unsubstituted amino group, and at least one of X ¹ and X ² is a halogen atom.

P and q each represent an integer of 0, 1 or 2, and p and q cannot be 0 at the same time, and p
When 2 is 2, X ¹ may be the same or different groups from each other, and when q is 2, X ² may be the same or different groups from each other.

Further, in A, Ar ¹⁰ represents an aromatic carbocyclic group or an aromatic heterocyclic group having at least a fluorinated hydrocarbon group. Z represents a non-metal atom group necessary for forming a substituted or unsubstituted aromatic carbocycle or a substituted or unsubstituted aromatic heterocycle.

M and n each represent an integer of 0, 1 or 2. However, m and n are not 0 at the same time.

Examples of the halogen atom represented by X ¹ and X ^{2 in} the general formula (14) include chlorine atom, bromine atom, fluorine atom and iodine atom. At least one of X ¹ and X ² has a halogen atom.

The alkyl group represented by X ¹ and X ² is preferably a substituted or unsubstituted alkyl group having 1 to 4 carbon atoms, and examples of such an alkyl group include
For example, methyl group, ethyl group, β-cyanoethyl group, iso-
Examples thereof include a propyl group, a trifluoromethyl group, a t-butyl group and the like.

The alkoxy group represented by X ¹ and X ² is preferably a substituted or unsubstituted alkoxy group having 1 to 4 carbon atoms. Examples of such an alkoxy group include methoxy group and ethoxy group. Group, β-chloroethoxy group, sec-butoxy group and the like.

Further, the substituted or unsubstituted amino group represented by X ¹ and X ² is, for example, one substituted with an alkyl group, an aryl group (preferably a phenyl group) or the like, for example, an N-methylamino group. , N-ethylamino group, N, N-
Examples thereof include a dimethylamino group, an N, N-diethylamino group, an N-phenylamino group, an N, N-diphenylamino group, an acetylamino group substituted with an acyl group, and a p-chlorobenzoylamino group. In the general formula (14), p and q each represent 0, 1 or 2, but p and q are not 0 at the same time, preferably p = 1 and q = 0.
Alternatively, p = 1 and q = 1.

Further, when p or q is 2, X ¹ or X ² may be the same or different groups.

The bisazo compound represented by the general formula (14) is preferably the following general formulas (14b), (14c) and (14).
It is represented by d) and (14e).

[0070]

[Chemical 11]

[0071]

[Chemical 12]

In the formula, X ^1a , X ^1b , X ^2a and X ^2b are each a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a nitro group, a cyano group or a hydroxy group. Alternatively, it represents a substituted or unsubstituted amino group, and at least one of X ^1a , X ^1b , X ^2a and X ^2b is a halogen atom. X ^1a and X ^1b , and X ^2a and X ^2b may be the same or different groups from each other.

Ar ¹¹ has the same meaning as Ar ¹⁰ in the general formula (14).

Y has the same meaning as the substituent of Z in formula (14).

The bisazo compound represented by the general formula (14) can be easily synthesized by a known method.

Specific examples of the compounds represented by the general formulas (9) to (14) are described, for example, in JP-A-60-172044, page 23, lower right column, line 1 to page 46, upper right column, line 8. Described in the eye.

Among the above-mentioned phthalocyanine pigments, the pigments preferably used in the present invention include, for example, metal phthalocyanine having a central atom of copper, cobalt, lead, zinc and the like and metal-free phthalocyanine not containing them, and a crystalline type Α type, β type, γ type, X type, τ type, τ ′ type, η
Type and η'type are preferably used. More detailed description of such phthalocyanine pigments is described in JP-A-62-79470 and JP-A-62-47054.

As a particularly preferable phthalocyanine pigment, a black angle 2θ of CuKα characteristic X-ray diffraction spectrum is shown.
At least 9.6 ± 0.2 ° and 27.2 ± 0.2 °, respectively X
There is a crystalline titanyl phthalocyanine pigment that exhibits a peak of linear intensity.

1 to 3 show the layer structure of the photoconductor of the present invention, 1 is a conductive support, 2 is a charge transport layer, and 3 is a charge transport layer.
Is a charge generation layer, and 4 and 5 are intermediate layers and protective layers which are provided as necessary. To manufacture the drum-shaped photoreceptor having the above-mentioned layer structure, first, a cylinder formed by vapor-depositing or laminating a metal on a metal cylinder or a plastic cylinder of aluminum, stainless steel, steel, copper, brass, zinc or the like to form a conductive layer. If necessary, an intermediate layer 4 having a thickness of 0.01 to 2 μm is provided on the substrate 1.

The intermediate layer 4 is made of, for example, polyamide resin,
Acrylic resin, methacrylic resin, vinyl chloride resin, vinyl acetate resin, epoxy resin, polyurethane resin, phenol resin, polyester resin, alkyd resin, polycarbonate resin, silicone resin, melamine resin, vinyl chloride-vinyl acetate copolymer resin, vinyl chloride -Vinyl acetate-maleic anhydride copolymer resin, cellulose resin, polyvinyl alcohol resin, casein and other resins such as butylamine, diethylamine, ethylenediamine, isopropanolamine, monoethanolamine, triethanolamine, triethylenediamine, N, N-dimethyl Formamide, acetone, methyl ethyl ketone, cyclohexanone, benzene, toluene, xylene, chloroform, 1,2-dichloroethane, dichloromethane, tetrahydrofuran, dioxane Methanol, ethanol, isopropanol, ethyl acetate, butyl acetate, dissolved in an organic solvent such as dimethyl sulfoxide, the resulting resin solution, for example blade coating, roll coating, dip coating,
It is formed by coating by a coating method such as spray coating, circular slide hopper coating, circular extrusion coating, circular small amount dip coating.

The intermediate layer 4 is provided for the purpose of shielding surface defects of the support 1, adhering to the photosensitive layer, preventing charge injection from the support 1, adjusting the image quality of the photosensitive layer, etc.
If it is less than μm, the above-mentioned object is not achieved, and if it exceeds 2 μm, the residual charge at the time of image exposure on the photosensitive layer becomes large and fog occurs, and electrophotographic performance deteriorates in the process of repeated image formation. .

The protective layer 5, which is provided as necessary, is a resin layer having a thickness of 0.01 to 3 μm using the resin for the intermediate layer, for example, polycarbonate, styrene resin, acrylic resin, etc. It is provided for the purpose of protecting the action of the environmental atmosphere and improving the mechanical wear resistance.

Next, the charge transport layer 2 is provided on the intermediate layer 4.

To form the charge transport layer 2, for example, polyester, methacrylic resin, acrylic resin, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl acetate, melamine resin, polyurethane, styrene-acrylic copolymer, styrene. -Butadiene copolymer, vinylidene chloride-acrylonitrile copolymer, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-
Maleic anhydride copolymer, silicone resin, styrene-
Alkyd resin, polyvinyl carbazole, polyvinyl butyral, etc. JP-A-60-172044 and 60-172045
No. 63-65444, No. 63-148263, JP-A 1-269942
No. 1, 1-269942 and the like resin such as polycarbonate is mixed and dissolved in 5 to 300 parts by weight to 1000 parts by weight of the solvent selected from the solvent for the intermediate layer, and 1 to the total solid content.
0-9000 ppm of silicone oil, preferably methylphenyl silicone oil, is dissolved. Then, 30 parts by weight or more, preferably 30 to 300 parts by weight, of the charge transport material is mixed and dissolved in the obtained solution per 100 parts by weight of the binder resin, and the obtained solution is applied onto the intermediate layer 4 by the intermediate layer coating method. 5 to 50 μm thick by applying coating by any one of
The charge transport layer 2 having a thickness of 10 to 40 μm is preferably formed.

Next, using a solvent and a binder resin selected from the solvent and the binder resin group used for forming the charge transport layer, the binder resin 1 is added to 1000 parts by weight of the solvent.
To 100 parts by weight are mixed and dissolved, and the resulting solution is 10 to 1000 parts by weight, preferably 20 to 500 parts by weight, and the charge generating substance is mixed and dispersed per 100 parts by weight of the binder resin, and based on the total solid content. 1010-10000 ppm of silicone oil, preferably methylphenyl silicone oil, is dissolved.

The obtained dispersion liquid is coated with high efficiency and high accuracy by a coating machine selected especially, such as a circular slide hopper coating machine, a circular extrusion coating machine or a circular small amount coating machine,
The charge generation layer 3 having a thickness of up to 20 μm is formed, and the photoreceptor of the present invention is obtained.

Here, if the layer thickness of the charge transport layer 2 is less than 5 μm, the potential is lowered, and the charge transport ability is insufficient, resulting in a decrease in sensitivity, and if it exceeds 50 μm, the charge transport path becomes too large, and the arrow Insufficient tension sensitivity occurs. Further, if the amount of the charge transport material with respect to the binder resin is less than 30 parts by weight, the charge transport ability is insufficient and sensitivity becomes insufficient, and if it exceeds 300 parts by weight,
The dark resistance of the photosensitive layer decreases, leading to a decrease in potential.

Next, when the layer thickness of the charge generating layer 3 is less than 0.05 μm, a uniform coating layer cannot be obtained, and sufficient charge cannot be generated by image exposure, resulting in insufficient sensitivity. Again 20
When it exceeds μm, there are many areas where the image exposure light does not reach,
The charges generated on the surface are trapped and the residual charges become large, and fatigue deterioration occurs when images are repeatedly formed. Further, if the amount of the charge generating substance with respect to the binder resin is less than 10 parts by weight, the sensitivity is insufficient and the residual charge is increased, and if it exceeds 1000 parts by weight, the receptive potential is lowered and the charging becomes defective. Here, the charge generation layer 3 forms the surface layer of the photoconductor and is excellent in abrasion resistance, environment resistance and the like in addition to electrophotographic performance, and particularly uniform coating processing is required.

Therefore, since the charge generation layer 3 contains a larger amount of silicone oil than the lower charge transport layer, it is excellent in abrasion resistance, environment resistance and the like and exhibits high durability. To be done. Furthermore, since the charge generation layer coating liquid containing a sufficient amount of silicone oil is applied on the lower charge transport layer containing a proper amount of silicone oil, the wet coating is spread well and a uniform coating film is easily formed. can get. Further, in particular, when the coating liquid for the charge generating layer is applied, uniform coating can be performed at a high speed without dissolving the lower layer.
Since the cylindrical body coating machine shown in the figure is used, a favorable charge generation layer is formed by a synergistic action with the action of the silicone oil, and as a result, a preferable photoreceptor is obtained.

FIG. 4 (a) is a sectional view of the coating machine 11 including the cylindrical support 10, and FIG. 4 (b) is a partially cutaway perspective view thereof, in which 10 is a direction A. A cylindrical support to be transported, 11 is a circular slide hopper coating machine, 12 is a coating liquid distribution chamber of the apparatus 11, 13 is a coating liquid distribution slit, 14 is a coating liquid supply pipe, 15 is a liquid receiver, and 16 is a hopper edge. Reference numeral 17 denotes a coating solution slide surface, and 18 denotes a coating layer.

At the time of coating, the coating liquid S is supplied to the coating liquid supply pipe 14 by a pump or the like in a required amount, is evenly distributed in the circumferential direction by the coating liquid distribution chamber 12, passes through the distribution slit 13, and slides. Flow 17 evenly in the circumferential direction. Thereafter, the coating liquid S forms a bead between the hopper edge 16 and the outer peripheral surface of the support 10. The support 10 is conveyed in the direction of arrow A with the bead and the outer peripheral surface of the support 10 in contact with each other, and the coating layer 18 is formed on the surface. According to such a coating machine, the solvent evaporates quickly from the coating layer 18, so that a dry coating film can be easily obtained by providing a simple drying device. Further, since the required amount of the coating liquid S is sent, the coating liquid is not wasted and the cost of the material can be reduced. In addition, since it is the simultaneous contact coating on the circumference, it is possible to perform uniform coating without a seam, the coating film is determined by the liquid supply amount, the viscosity and the moving speed of the support 10, and the control of the coating thickness is easy. By the action, there is little fluctuation in the coating thickness, and high quality and high productivity coating is possible. In the circular slide hopper coating machine 11, the gap between the diameter of the slide surface end portion and the outer diameter of the coated object (cylindrical) is
0.05 to 1 mm is preferable, and 0.1 to 0.6 mm is more preferable. The inclination angle of the slide surface is preferably 10 ° to 70 ° with respect to the horizontal, and more preferably 20 ° to 45 °.

The viscosity of the coating solution is preferably in the range of 0.5 to 700 Cp, and more preferably 1 to 500 Cp.

In order to make the coating liquid flow out uniformly from the coating liquid distribution slit in the circumferential direction, in the slide hopper coating machine, the resistance of the distribution chamber (Pc) and the coating liquid distribution slit flow. When slit resistance (Ps) is Ps / Pc
It is ≧ 80, and more preferably in the range of 100 to 100,000.

Next, FIG. 5 is a sectional view of the circular extrusion coating machine 11 ', and the same functional portions as those in FIG. 4 are designated by the same reference numerals. In the circular extrusion coating device 11 ', the coating liquid S required for coating is supplied to the coating liquid supply pipe 14 by a pump or the like, and is uniformly distributed in the circumferential direction by the coating liquid distribution chamber 12 to form a distribution slit. It is extruded through the inside of the hopper 13 and flows out uniformly and continuously from the hopper edge 16 to form a coating liquid bead between itself and the outer peripheral surface of the support, whereby the coating layer 18 is coated.

The length of the hopper edge 16 is 0.1 to 10 mm, preferably 0.5 to 4 mm. The angle of inclination of the hopper edge is preferably within the range of 30 ° from the vertical downward direction, and more preferably within the range of 20 ° from the vertical downward direction. Hopper edge tilt angle is 30
If the temperature exceeds 50 ° C., the cross-linking of the coating solution becomes short, and it becomes difficult to obtain a good coating film.

In the extrusion coating machine 11 ', the distribution chamber resistance (Pc) and the slit resistance (Ps) when flowing through the coating liquid distribution slit are Ps / Pc ≧ 40, more preferably 40 to 1000.
By keeping the relationship within the range of 00, it is possible to apply the coating liquid stably and uniformly.

The distribution chamber resistance (Pc) and the slit resistance (Ps) may be determined according to the coating liquid supply speed, viscosity and supply pressure. Further, in the extrusion coating machine 11 ', the hopper edge is 0.05 to 1 mm larger than the outer diameter of the coated object, and more preferably 2 ho mm to 4 ho mm when the coating film thickness is ho mm.
It is desirable to have a length in the coating direction of 0.1 to 10 mm, more preferably 0.5 to 4 mm.

FIG. 6 is a sectional view of the circular small amount dip coating machine 11 ″, in which the bottom plate 21 is fixed to the stacking plate 20, and the liquid stopping blade 23 is narrowed by the upper surface of the bottom plate 21 and the pressing plate 22. The coating liquid S is contained in the liquid tank 24, and a liquid replenishing plate 25 for replenishing the coating liquid S to the liquid tank 24 is provided on the upper surface of the liquid tank 24. A pair of liquid supply ports 26 is provided.

The entire applicator 11 "is formed in a cylindrical shape. The liquid stopping blade 23 is made of flexible rubber, synthetic resin or the like, and is constructed so that the support 10 can be held tightly. .

The bottom plate 21, the pressing plate 22, and the liquid tank 24 have holes 27a,
27a ', 27a "are provided through the liquid supply plate 25, and holes 27b having a diameter smaller than the holes 27a, 27a', 27a" are provided through the liquid supply plate 25, and the blade 23 has a diameter smaller than the hole 27b. Hole
27c is pierced.

The periphery of the hole 27c of the blade 23 is closely attached to the outer peripheral surface of the support 10, and the periphery of the hole 27b of the liquid replenishing plate 25 is opposed to the outer peripheral surface of the support with a very small gap. As a result, evaporation of the solvent during coating is suppressed, and rapid drying of the coating film immediately after coating is prevented.

In the liquid tank 24, the liquid storage chamber 28 is provided in the lower half part.
Is provided, and a liquid reservoir 29 is provided in the upper half of the liquid reservoir 29.
A plurality of communication holes 30 for flowing the coating liquid S in 29 are arranged in the circumferential direction, and a reflux hole 31 for overflow is provided on the outer peripheral wall of the containing portion 28 so that the liquid surface is always constant. Designed to keep. Further, a plurality of air holes 33 are provided in the inner peripheral wall of the housing portion 28 in the circumferential direction, and communicate with the outside air through the hole portions 27b.

As described above, the circular slide hopper coating machine 11 and the circular extrusion coating machine 11 'used in the method for producing a photoreceptor of the present invention.
, And a representative example of a circular small amount dip coating machine 11 "has been described. All of these coating machines are suitable for coating the coating liquid on a cylindrical support, especially when forming a surface layer of a photoreceptor. In addition, the lower layer is less likely to be dissolved or eroded, and uniform coating can be performed at high speed, so that high quality and high productivity of the photoreceptor can be achieved. A coating device 45 having a support body transport mechanism as shown in Fig. 7 is used, in which 40a, 40b, 40c are spacers for alternately fitting and connecting the cylindrical support bodies 10a, 10b (10c) and the like. It is vertically conveyed integrally with the object to be coated, and continuously coated by a cylindrical body coating machine 41 such as the circular slide hopper coating machine, circular extrusion coating machine or circular small amount dip coating machine. , A spacer 40b fitted above and below the support 10b , 40c to grip the support 10
a pair of upper and lower grips 43A having a pair of upper and lower grips 42a and 42b for conveying b and spacers 40a and 40b fitted to the upper and lower sides of the support 10a to convey the support 10a upward. It is performed by the gripping tool 43B having the gripping portions 42c and 42d. The grippers 43A and 43B are supported by the main body 45 of the apparatus, and via lifting members 46A and 46B screwed to ball screws 44A and 44B that are rotationally driven by a drive source (not shown) and coil springs 47A and 47B that are buffer members. They are connected and are moved up and down as the elevating members 46A and 46B are moved up and down in conjunction with the rotation of the ball screws 44A and 44B. The elevating members 46A and 46B are moved up and down based on a predetermined program signal, and while one elevating member grips the spacer and conveys the coated object upward, the other elevating members do not collide with each other. It is lowered in a state where the grip is released, and the lower spacer is gripped to convey the next support.

Reference numeral 49 is a support supply hand, and if a cylindrical support is continuously set on this support by a robot or the like at a timing, the hand is raised to a predetermined position and the gripping tool is moved. The support is continuously fed to the applicator 41 in cooperation with the upward conveying operation of the 43A or 43B, coated and processed, and dried by an air jet dryer immediately above the applicator 41 to form a drum-shaped photosensitive member. The body is formed.
This photoconductor is adsorbed and carried out of the device by the carry-out hand 48,
Be shipped.

In addition to the transfer coating device 45, for example, JP-A-56
No. 101149, a pair of left and right chain belts provided with a large number of elastic grippers may continuously convey the cylindrical support vertically upward and apply the support.

[0106]

EXAMPLES The present invention will be specifically described below with reference to examples, but the embodiments of the present invention are not limited thereto. The charge generating substance, charge transporting substance, charge generating layer and charge transporting layer hereinafter are abbreviated as CGM, CTM, CGL and CTL.

(Preparation of Cylindrical Support) An aluminum tube having a length of 355.5 mm and an outer diameter of 80 mm was prepared, and a vinyl chloride-vinyl acetate-maleic anhydride copolymer (Sekisui Chemical Co., Ltd.) was provided in each of these tubes. Manufactured by S-REC MF-10) 10 parts by weight is dissolved in 1000 parts by weight of methyl ethyl ketone, and the resulting solution is applied by a normal dip coating method and dried to form an intermediate layer having a dry film thickness of 0.1 μm, and 15 Was prepared as a test support.

(Preparation of Photoreceptor for Testing of the Present Invention) (1) Preparation of Test No. 1 to No. 3 Photoreceptors: Basic support for CTL (1 )
The silicone content relative to the solid content of is expressed in ppm,
The amount X of X is changed to 50 ppm, 100 ppm, and 200 ppm as shown in Table 1-1 to prepare three kinds of coating liquids for CTL, and the coating is performed by the coating device 45 with the slide hopper coating machine 11 incorporated. Three types of CTL of 20 μm, 20 μm and 21 μm were formed.

CTL basic formulation (1) Polycarbonate (PCZ-200 manufactured by Mitsubishi Gas Chemical Co., Inc.) 100 parts by weight CTM (1) 90 parts by weight of the following structure Silicone oil (KF-54 manufactured by Shin-Etsu Chemical Co., Ltd.) Xppm (total solid content of the formulation) About 1,2-dichloromethane 1000 parts by weight Next, the content of silicone oil based on the solid content of the basic formulation (1) for CGL of the following formulation is expressed in ppm, and the amount of the ppm is X
To 1500 ppm to prepare a CGL coating solution, which is divided into 3 parts and coated on the CTL of the above support using a coating device 45 incorporating a circular slide hopper coating machine 11 similar to the case of CTL, CGLs each having a dry film thickness of 6 μm, 8 μm and 4 μm were formed to obtain photoconductors No. 1 to No. 3 for testing of the present invention.

[0110]   CGL basic prescription (1):   Polycarbonate (PCZ-200) 10 parts by weight   40 parts by weight of CGM (1) with the following structure   Silicone oil KF-54 (about total prescription solid content) 1500ppm   Tetrahydrofuran 1000 parts by weight

[0111]

[Chemical 13]

(2) Test No. 4 to No. 6 Preparation of photoconductors:
The silicone oil content relative to the solid content of the following basic formulation for CTL (2) is expressed in ppm, and the amount of the ppm is changed to 10 ppm, 20 ppm, and 100 ppm as shown in Table 1-1, and three types of CTL coating liquids are prepared. Prepared, and applied to each of the three supports among the above-mentioned supports by using an ordinary dip coating machine to obtain a dry film thickness.
19 μm, 20 μm, 20 μm CTLs were formed.

Basic formulation for CTL (2) Polycarbonate (PCZ-200) 100 parts by weight CTM with the following structure (2) 90 parts by weight Silicone oil (SH510 manufactured by Toray Silicon Co.) (Regarding total solid content) Xppm 1,2- Dichloromethane 1000 parts by weight Next, the content of silicone oil based on the solid content of the basic formulation (2) for CGL of the following formulation is expressed in ppm, and the amount of the ppm is X
As shown in Table 1-1, three kinds of CGL coating liquids were prepared by changing them to 1100ppm, 1100ppm and 1200ppm, and these were coated on the CTL of the support by a circular extrusion coating machine 11 '.
To obtain a dry film thickness of 5 μm, 5 μm, 6
A CGL of μm is formed, and the photoconductors No. 4 to No. 6 for testing of the present invention are formed.
Got

[0114]   Basic prescription for CGL (2)   Polycarbonate (PCZ-200) 10 parts by weight   40 parts by weight of CGM (2) with the following structure   Silicone oil SH510 (for all prescription solids) Xppm   Tetrahydrofuran 1000 parts by weight

[0115]

[Chemical 14]

(3) Test No. 7 to No. 10 Preparation of photoconductors:
The content of silicone oil based on the solid content of the basic formulation (3) for CTL of the following formulation is expressed in ppm, and the amount X of the ppm is 1000
ppm, 5000ppm, 8000ppm to prepare three kinds of coating liquid for CTL, and apply these to three of the above-mentioned supports by a normal dip coating machine,
21 μm, 21 μm, 20 μm CTLs were formed. Basic formulation for CTL (3): Polycarbonate (PCZ-200) 100 parts by weight CTM (3) with the following structure 90 parts by weight Silicone oil (TSF431 manufactured by Toshiba Silicon Co.) (Regarding total solid content) Xppm 1,2-dichloromethane 1000 Parts by weight Next, the content of silicone oil is expressed in ppm with respect to the solid content of the basic formulation (3) for CGL of the following formulation, and the amount of the ppm is X
As shown in Table 1-1, three kinds of CGL coating liquids were prepared by changing them to 4000 ppm, 6000 ppm and 9000 ppm, and these support materials were applied using a coating device 45 incorporating a circular small amount dip coating machine 11 ". It is applied on the CTL of and the dry film thickness is shown in Table 1-
CGLs of 4 μm, 5 μm and 4 μm were formed as in No. 1 to obtain the photoconductors No. 7 to No. 9 for testing of the present invention.

Basic formulation for CGL (3) Polycarbonate (PCZ-200) 10 parts by weight CGM (3) having the following structure 40 parts by weight Silicone oil (TSF431) (Regarding total solids content) Xppm Tetrahydrofuran 1000 parts by weight Also, Separately, for one of the above-mentioned supports, dimethyl silicone oil was used in place of the silicone oil TSF431 of the basic formulation (3) for CTL, and the silicone oil was contained at 10 ppm with respect to the formulation solid content. The coating solution was applied by an ordinary dip coating machine to form a CTL having a dry film thickness of 20 μm. Dimethyl silicone oil was used on the CTL instead of the silicone oil TSF431 of the basic formulation (3) for CGL, and the silicone oil was adjusted to 1100 ppm with respect to the solid content of the formulation.
The coating liquid for GL was applied by the above-mentioned coating device 45 equipped with a circular small amount dip coating machine 11 ″ to form CGL having a dry film thickness of 6 μm to obtain a photoconductor No. 10 for test of the present invention.

[0118]

[Chemical 15]

(Preparation of Photoreceptor for Comparative Test) (4) Preparation of Photoreceptor of Test Nos. 11 and 12: Amount Xppm of Silicone Oil of Basic Formula (1) for CTL is 0 and 1000 ppm as shown in Table 1-1. To prepare two kinds of CTL coating solutions, and apply them to two of the supports using a coating device 45 having a circular slide hopper coating machine 11 incorporated therein, and dry them. Two types of CTL with a film thickness of 18 μm were formed.

Next, the amount Xppm of silicone oil in the basic formulation (1) for CTL was changed to 2000 ppm and 0 ppm as shown in Table 1-1 to prepare two types of CGL coating solutions, and the slide hopper coating machine 11 was used. Using the built-in coating device 45, each of the above two types of CTL was coated to form two types of CGL having a dry film thickness of 7 μm and 6 μm as shown in Table 1-1. And 12 were obtained.

(5) Preparation of Photoreceptor of Test No. 13: CTL coating liquid was prepared with the amount of silicone oil Xppm of the basic formulation (1) for CTL set to 50 ppm, and this was used as one of the above supports. It was coated on the support of 1. using a normal dip coating machine to form a CTL having a dry film thickness of 19 μm.

Next, a coating solution for CGL was prepared by setting the amount Xppm of the silicone oil of the basic formulation for CGL (1) to 500 ppm, and using this, the coating device 45 equipped with the circular extrusion coating machine 11 'on the CTL was used. Was applied to form CGL having a dry film thickness of 5 μm, and a photoconductor No. 13 for comparison test was obtained.

(6) Preparation of Test Nos. 14 and 15: CTL
Table 1 shows the amount Xppm of silicone oil in the basic formulation (1)
As shown in -1, change to 20000ppm and 50ppm to prepare two kinds of CTL coating liquids, and apply these to the remaining 2 of the supports.
Two kinds of CTL with a dry film thickness of 20 μm and 21 μm as shown in Table 1-1 were applied on a support of this book using an ordinary dip coating machine.
Was formed.

Next, the silicone oil amount Xppm of the basic formulation (1) for CGL was changed to 25000 ppm and 12000 ppm as shown in Table 1-1 to prepare two types of CGL coating liquids, which were applied to the above two types of CTL. Coating is performed by using a coating device 45 in which a circular slide hopper coating machine 11 is incorporated, and two types of CGL having a dry film thickness of 5 μm are formed, and photoconductors No. 14 and No. 15 for comparison test are formed.
Got

When coating the above 15 types of photoconductors, the coating state of CTL of the lower layer and the coating state of CGL of the upper layer were observed each time, and the results are shown in Table 1-2.

In addition, the above-mentioned 15 types of photoconductors are U-Bi manufactured by Konica
It was mounted on a modified x3035 machine (correctly modified charging characteristics), and 10,000 live tests were conducted for each test in an atmosphere with a relative humidity of -60% and a temperature of 20 ° C, and the image quality was observed and the results are shown in Table 1- Two
It was shown to.

Further, the black paper potential (V _B ) and the white paper potential (V _W ) of the photoconductor were measured before and after the 10,000th repeated actual copying test, and the results are shown in Table 1-2.

The black paper potential (V _B ) in Table 1-2 is the reflection density.
Surface potential of photoreceptor and blank sheet potential (V _W ) for 1.3 original
Is the surface potential of the photoconductor with respect to an original having a reflection density of "0", and was measured by placing a probe of an electrometer at the position of the developing device before and after actual copying. Since a halogen lamp of 3000 ° K is used as an exposure light source, an IR cut filter having a cut wavelength of 13.0 nm was installed in the optical path in consideration of color balance, and a test was conducted.

[0129]

[Table 1]

In the coating column in the table, P1 ... Immersion coating P2 ... Circular slide hopper application P3 ... Circular extrusion coating P4 ... Circular small amount dip coating

[0131]

[Table 2]

From Tables 1-1 and 1-2, the photoconductors obtained by the production method of the present invention were superior in coating processing to the comparative photoconductors and were free from coating defects and image defects. It is understood that coating defects such as orange peel, repellency, and liquid drop are observed on the photoconductor, resulting in image defects such as image unevenness, black spots, and fog.

[0133]

As is apparent from the above description, according to the method for producing a photosensitive member of the present invention, the coating processability and the productivity are excellent, and the obtained photosensitive member is
It shows effects such as no image unevenness, streaks, and streaks, and excellent electrophotographic performance and durability during repeated use.

[Brief description of drawings]

FIG. 1 to FIG. 3 are cross-sectional views showing the layer structure of a photoconductor of the present invention.

2 (a) and 4 (b) are a sectional view and a partially broken perspective view of a circular slide hopper applicator used in the present invention.

3 and 4 are sectional views of a circular extrusion coating machine and a circular small amount dip coating machine used in the present invention.

FIG. 4 is a sectional view of a coating device used in the present invention.

[Explanation of symbols]

1: conductive support 2: Charge generation layer 3: Charge transport layer 10: Cylindrical support 11: Circular slide hopper coating machine 11 ': Circular extrusion coating machine 11 ”: circular small amount dip coating machine 12: Coating liquid distribution chamber 13: Distribution slit 16: Hopper edge 23: Liquid stop blade 24: Liquid tank 28: Liquid storage section 40a, b and c: spacer 41: Coating machine 42a, b, c and d: gripping part 45: Coating device

[Procedure amendment]

[Submission date] August 11, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

[1] (1) to (3) are each cross-sectional view showing the layer structure of the photoreceptor of the present invention.

2A and 2B are a sectional view and a partially broken perspective view of a circular slide hopper coating machine used in the present invention.

3 (a) and (b) is a respective cross-sectional view of a circular extrusion coater and a circular small amount dip coater used in the present invention.

FIG. 4 is a sectional view of a coating apparatus used in the present invention.

[Explanation of symbols] 1 Conductive support 2 Charge generation layer 3 Charge transport layer 10 Cylindrical support 11 Circular Slide Hopper Coater 11 ' Circular Extrusion Coater 11 " Circular Small Dip Coater 12 Coating liquid distribution chamber 13 Distribution slit 16 Hopper edge 23 Liquid stop blade 24 Liquid tank 28 Liquid storage parts 40a, b and c Spacer 41 Coating machines 42a, b, c and d Grip 45 Coating device

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

Claims (4)

[Claims] 1. An electrophotographic photoreceptor having a photosensitive layer comprising a charge transport layer and a charge generating layer laminated in this order on a conductive support, wherein each of the charge transport layer and the charge generating layer comprises silicone oil. A photoconductor, containing the silicone oil, wherein the concentration (ppm) of the silicone oil in each layer satisfies the following formula- (1) and formula- (2). Formula- (1): [Q] ≧ [P] +1000 Formula- (2): [Q] ≦ 10000 [wherein, [Q] is the concentration (ppm) of silicone oil in the charge generation layer, [P] Represents the concentration (ppm) of silicone oil in the charge transport layer] 2. The photoreceptor according to claim 1, wherein the silicone oil is methylphenyl silicone oil. 3. A method for producing a photoconductor, comprising: coating a cylindrical conductive support with at least a charge transport layer and a charge generation layer formed thereon in this order from the surface of the support, wherein the charge generation layer and the charge transport layer are used. Each of the coating liquids described above contains silicone oil in the concentration (ppm) defined in the following formulas (1) and (2) in both formed layers, and at least the charge generation layer is coated with A method for producing a photoreceptor, which is carried out by using a cylindrical body coating machine in which a coating liquid surrounds and contacts a cylindrical conductive support. Formula- (1): [Q] ≧ [P] +1000 Formula- (2): [Q] ≦ 10,000 [where [Q] is the concentration (ppm) of silicone oil in the charge generation layer, and [P] is the transport layer) Indicates the concentration (ppm) of silicone oil in the product. ] 4. The method for producing a photoconductor according to claim 3, wherein the silicone oil is methylphenyl silicone oil.