JPH11249327A - Electrophotographic photoreceptor, device unit provided with same and electrophotographic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor having very high sensitivity characteristics to long wavelength. SOLUTION: This electrophotographic photoreceptor has a photosensitive layer contg. crystal-form chloro-aluminum phthalocyanine on the electrically conductive substrate. The crystal-form chloro-aluminum phthalocyanine is obtd. by subjecting chloro-aluminum phthalocyanine together with an org. solvent and a resin binder to dispersion treatment and has the highest diffraction peak at 7.0 deg. Bragg angle (2θ deg.0.2 deg.) in X-ray diffraction with CuKα.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, phthalocyanine pigments have been attracting attention and studied as electronic materials used for electrophotographic photosensitive members, solar cells, sensors, and the like, in addition to coloring purposes.

In recent years, non-impact printers to which electrophotographic technology is applied have become widespread in place of conventional impact-type printers as terminal printers. These are mainly laser beam printers using laser light as a light source, and a semiconductor laser is used as the light source in terms of cost, size of the apparatus, and the like.

At present, semiconductor lasers mainly used are
Since the laser has a long wavelength of 790 ± 20 nm, the development of an electrophotographic photoreceptor having sufficient sensitivity to such long wavelength light has been promoted.

The sensitivity of an electrophotographic photoreceptor varies depending on the type of charge generation material. Recently, chloroaluminum phthalocyanine, chloroindium phthalocyanine, oxyvanadium phthalocyanine have been used as charge generation materials having sensitivity to long wavelength light. There are many studies on metal phthalocyanines such as chlorogallium phthalocyanine, magnesium phthalocyanine, oxytitanium phthalocyanine and the like, and metal phthalocyanines such as non-metal phthalocyanine and the like.

An electrophotographic photosensitive member using chloroaluminum phthalocyanine is disclosed in Japanese Patent Application Laid-Open No. 58-16864.
No. 9, chloroaluminum phthalocyanine is vapor-deposited and then treated with a solvent, and CuKα is rearranged into a crystal state showing a strong diffraction peak at 7.0 ° at a Bragg angle (2θ) in X-ray diffraction to obtain a long wavelength. There has been proposed a photoreceptor having an improved sensitivity in the region.

Further, Japanese Patent Laid-Open No. 58-209745,
JP-A-62-133462 and JP-A-63-43
No. 155 discloses a Bragg angle (2θ ± 0.2 °).
There has been proposed a photoreceptor excellent in long wavelength sensitivity using a crystal form showing a strong diffraction peak at 7 °, 11.2 °, 16.7 °, and 25.6 °.

However, the above-mentioned photoreceptor using conventional chloroaluminum phthalocyanine is a semiconductor laser.
It has a half-exposure sensitivity E _1/2 of about 0.5 (μJ / cm ² ) for light near 800 nm which is the oscillation wavelength of a laser beam printer or an electrophotographic copying machine in recent years. However, it was not enough to cope with the speeding up.

In recent years, an electrophotographic photosensitive member using a specific crystal form of oxytitanium phthalocyanine having extremely high sensitivity has been proposed. For example, JP-A-64-17066 and JP-A-3-128973. However, these high-sensitivity crystal forms require a step of once converting the pigment after synthesis into an amorphous form by an acid paste method or the like, and then treating it with a specific solvent to convert it into a predetermined crystal form. There is also the problem of poor productivity.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrophotographic photosensitive member having extremely high sensitivity to long wavelengths, and to provide an apparatus unit and an electrophotographic apparatus having the electrophotographic photosensitive member. To provide.

[0011]

The present invention provides an electrophotographic photosensitive member having a photosensitive layer on a conductive support, wherein the photosensitive layer is obtained by dispersing chloroaluminum phthalocyanine together with an organic solvent and a binder resin. , C
Bragg angle (2θ ± 0.2) in X-ray diffraction of uKα
(°), a crystalline form of chloroaluminum phthalocyanine exhibiting the strongest diffraction peak at 7.0 °.

The present invention also relates to an electrophotographic photoreceptor having a photosensitive layer comprising at least two layers of a charge generation layer and a charge transport layer on a conductive support, wherein the charge generation layer contains chloroaluminum phthalocyanine as an organic solvent and a binder. X of CuKα obtained by dispersion treatment with resin
6. Bragg angle (2θ ± 0.2 °) in line diffraction.
An electrophotographic photosensitive member containing chloroaluminum phthalocyanine in a crystalline form showing the strongest diffraction peak at 0 °.

According to the present invention, there is further provided an electrophotographic photoreceptor of the present invention, and at least one means selected from the group consisting of a charging means, a developing means and a cleaning means, integrally supported and detachably mounted on the electrophotographic apparatus main body. It is composed of a device unit characterized by being freely adjustable.

Further, the present invention comprises an electrophotographic apparatus comprising the electrophotographic photosensitive member of the present invention, a charging unit, an image exposing unit, a developing unit and a transferring unit.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The electrophotographic photoreceptor of the present invention has a Bragg angle (2θ ± 2) in CuKα X-ray diffraction obtained by subjecting a photosensitive layer to a dispersion treatment of chloroaluminum phthalocyanine together with an organic solvent and a binder resin.
0.2 °), and containing a crystalline form of chloroaluminum phthalocyanine exhibiting the strongest diffraction peak at 7.0 °, which is about 2 times smaller than that of an electrophotographic photoreceptor using a conventional chloroaluminum phthalocyanine. It exhibits twice as high sensitivity characteristics.

The electrophotographic photoreceptor of the present invention may have any known layer constitution, and the electrophotographic photoreceptor of the present invention comprises a laminate of the above-mentioned charge generating layer containing the specific chloroaluminum phthalocyanine of the present invention and a charge transporting layer containing a charge transporting substance. The function-separated type photoreceptor described above is particularly preferred.

The electrophotographic photosensitive member of the present invention will be described in detail by taking a function-separated type photosensitive member as an example.

The structure of chloroaluminum phthalocyanine used as the charge generating material is represented by the following structural formula.

Embedded image In the formula, k, m, n, and p are each independently an integer of 0 to 4.

In the synthesis of chloroaluminum phthalocyanine, orthophthalodinitrile and aluminum chloride are converted to α-
The reaction crude product, which is easily obtained by reacting in a solvent such as chloronaphthalene or quinoline, is dispersed and washed with a solvent such as DMF, if necessary, and then dried.

The crystal form at this stage varies depending on the reaction conditions and purification conditions, but usually shows a strong peak at 26.9 ° at a Bragg angle (2θ ± 0.2 °) in X-ray diffraction of CuKα. Crystal form, or 6.7 °, 11.2
It is a known crystal form having peaks at °, 16.7 ° and 25.6 ° (main peak). In the present invention, any crystal form may be used at this stage.

In the present invention, the chloroaluminum phthalocyanine thus obtained is not deposited or subjected to a special pretreatment for crystal transformation, and is directly used in a dispersion step for preparing a coating solution for a charge generation layer. Can be offered. The pigment is dispersed together with an organic solvent and a binder resin. As the organic solvent, the crystal form in this step is a peak having the strongest peak at 7.0 ° at a Bragg angle (2θ ± 0.2 °). Any solvent may be used as long as it is a solvent that can be rearranged into a crystal form, but an alicyclic ketone solvent is preferable, and the best sensitivity is obtained when cyclohexane is used.

The binder resin is selected from a wide range of insulating resins or organic conductive polymers.
Preferred are polyvinyl butyral, polyvinyl benzal, polyarylate, polycarbonate, polyester, phenoxy resin, cellulose resin, acrylic resin, polyurethane and the like. These resins may have a substituent, and the substituent is preferably a halogen atom, an alkyl group, an alkoxy group, a nitro group, a trifluoromethyl group, a cyano group, or the like.

As the dispersion method, any known dispersion method such as a ball mill, a sand mill, a paint shaker or the like may be used, but the dispersion condition is such that the crystal form before dispersion is the strongest at 7.0 °. In each case, it is necessary to examine the dislocation to a crystal form having the following formula.

The charge generation layer is formed by applying the above-mentioned coating solution for a charge generation layer on a conductive support and drying. As shown in FIG. 5, the crystal form of chloroaluminum phthalocyanine in the charge generation layer was determined by the Bragg angle (2θ ±
(0.2 °), a crystal form having a very strong peak at 7.0 ° is due to the dislocation of the crystal form during the dispersion process.

This crystal form is described in the above-mentioned JP-A-58-158.
It seems that the photoreceptor obtained by forming a charge generation layer in the present invention has much higher sensitivity, although it is considered to be similar to a crystal obtained by evaporating chloroaluminum phthalocyanine described in JP-A-649-649 and then performing a solvent treatment with THF or the like. The photoreceptor can be manufactured extremely simply because complicated characteristics such as vapor deposition and subsequent solvent treatment are not required.

The ratio of the chloroaluminum phthalocyanine to the binder resin in the charge generation layer is from 4/1 to 1/4,
Preferably it is 2/1 to 1/2. The film thickness is 0.05-5
μm, preferably 0.1 to 1.0 μm.

The conductive support may be any conductive material, such as aluminum or stainless steel, or a metal provided with a conductive layer, plastic, paper, or the like. And the like.

Further, an undercoat layer having a barrier function can be provided between the conductive support and the charge generation layer. Examples of the material for the undercoat layer include polyvinyl alcohol, polyethylene oxide, and ethyl cellulose.
, Methylcellulose, casein, polyamide, gelatin, glue and the like. It is formed by dissolving these materials in an appropriate solvent and applying the solution on a conductive support. The thickness is 0.2 to 3.0 μm.

The charge transport layer is formed by applying a coating solution obtained by dissolving a charge transport material and a binder resin in a solvent onto the charge generation layer and drying the coating solution. The film thickness is 5 to 40 μm,
Preferably it is 10 to 30 μm.

Examples of the charge transport material include various triarylamine compounds, hydrazone compounds, stilbene compounds, pyrazoline compounds, oxazole compounds, thiazole compounds, and triarylmethane compounds.

Further, as the binder resin, the above-mentioned binder resin used in the charge generation layer can be exemplified.

Further, additives such as various antioxidants and ultraviolet absorbers may be added as required.

The coating method of each layer described above includes a dipping method, a spray coating method, a spin coating method, a bead coating method, a blade coating method, a beam coating method, and the like. Can be used.

If the charge generating layer and the charge transporting layer are provided on the surface layer side in the reverse order of the above, it can be used as a photosensitive member for positive charging.

Further, a thin protective layer may be provided on the surface of the photosensitive layer in order to protect these photosensitive layers from external impact.

The charge generation layer may be mixed with other charge generation substances as needed.

In a single-layer type photoreceptor containing a charge generating substance and a charge transporting substance in the same layer, a liquid obtained by mixing the above-mentioned charge generating layer coating liquid and charge transporting layer coating liquid is coated on a conductive support. It can be prepared by coating and drying. The thickness of the photosensitive layer is 5 to 5.
It is 40 μm, preferably 10 to 30 μm.

The electrophotographic photoreceptor of the present invention can be used not only in printers such as laser beam printers, CRT printers and LED printers, but also in general electrophotographic copying machines and other electrophotographic applications. Can be widely used.

FIG. 9 is a schematic view of a general transfer type electrophotographic apparatus using the electrophotographic photosensitive member of the present invention. In FIG. 9, reference numeral 1 denotes a drum-shaped electrophotographic photosensitive member of the present invention. It is rotationally driven at a predetermined peripheral speed in the direction. In the rotation process, the photosensitive member 1 is uniformly charged at a predetermined positive or negative potential on the peripheral surface thereof by the primary charging means 3, and then the image exposure means (such as a slit exposure or a laser beam scanning exposure) is used. (See FIG. 1). Thus, an electrostatic latent image is sequentially formed on the peripheral surface of the photoconductor 1.

The formed electrostatic latent image is then transferred to developing means 5
Is transferred to the transfer material 6 from the paper supply unit (not shown) and fed between the photosensitive member 1 and the transfer means 6 in synchronization with the rotation of the photosensitive member 1. Are sequentially transferred by the transfer means 6. The transfer material 7 having undergone the image transfer is separated from the photoreceptor surface, introduced into the image fixing means 8 and subjected to image fixing, thereby being printed out as a copy (copy) outside the apparatus. The surface of the photoreceptor 1 after the image transfer is cleaned and cleaned by removing the transfer residual toner by the cleaning means 9, and further subjected to a static elimination process by the pre-exposure light 10 from the pre-exposure means (not shown). After that, it is repeatedly used for image formation. When the primary charging means 3 is a contact charging means using a charging roller or the like, pre-exposure is not necessarily required.

In the present invention, of the above-mentioned components such as the photoreceptor 1, the primary charging means 3, the developing means 5 and the cleaning means 9, a plurality of components are integrally connected as an apparatus unit. This equipment unit is used for copying machines and lasers.
It may be configured to be detachable from the main body of an electrophotographic apparatus such as a beam printer. For example, at least one of the primary charging unit 3, the developing unit 5 and the cleaning unit 9 is
In addition, the process cartridge 11 can be detachably attached to the apparatus main body by using the guide means such as the rail 12 of the apparatus main body by integrally supporting the cartridge. When the electrophotographic apparatus is a copier or a printer, the image exposure light 4 uses reflected light or transmitted light from the original, or reads the original with a sensor and converts it into a signal. This is light emitted by scanning of the laser beam, driving of the LED array, driving of the liquid crystal shutter array, and the like.

A synthesis example of chloroaluminum phthalocyanine used in the present invention will be described. Synthesis Example 1 51 parts of phthalonitrile, 20 parts of aluminum chloride, α-
After heating and stirring 200 parts of chloronaphthalene at 200 ° C. for 6 hours in a nitrogen atmosphere, the mixture was cooled to 130 ° C. and filtered. N, N-dimethylformamide 2 at 50 ° C.
After washing with stirring for 1 hour using 00 parts, the mixture was filtered off, washed with methanol on a filter, and dried to obtain 25 parts. The obtained crystal was a chloroaluminum phthalocyanine crystal having a strong peak at a Bragg angle 2θ of 26.9 ° in the CuKα characteristic X-ray diffraction diagram. FIG. 1 shows an X-ray diffraction pattern of the chloroaluminum phthalocyanine crystal, and FIG. 2 shows an infrared absorption spectrum thereof.

Elemental analysis value of this compound (C ₃₂ H ₁₆ N ₈ AlCl) Calculated value of CH N Cl (%) 66.85 2.80 19.49 6.17 Actual value (%) 65.74 2.77 20.32 6.76

Synthesis Example 2 51 parts of phthalonitrile, 20 parts of aluminum chloride and 200 parts of α-chloronaphthalene were heated and stirred at 200 ° C. for 6 hours in a nitrogen atmosphere, and then heated at 130 ° C.
And filtered off. The solid content was washed by boiling with stirring in 200 parts of toluene for 1 hour, filtered, washed with methanol on a filter, and dried to obtain 20 parts. The obtained crystal was a chloroaluminum phthalocyanine crystal having a strong peak at a Bragg angle 2θ of 26.9 ° in the CuKα characteristic X-ray diffraction diagram. FIG. 3 shows an X-ray diffraction pattern of this chloroaluminum phthalocyanine crystal, and FIG. 4 shows an infrared absorption spectrum thereof.

Elemental analysis value of this compound (C ₃₂ H ₁₆ N ₈ AlCl) Calculated value of CH N Cl (%) 66.85 2.80 19.49 6.17 Actual value (%) 64.23 3.02 18.72 6.45

The X-ray diffraction measurement was performed under the following conditions. Measuring instrument used: X-ray diffractometer M, manufactured by Mac Science
XP ¹⁸ X-ray tube: Cu, tube voltage: 50.0 kV, tube current: 30
0.0 mA, scan method: 2θ / θ scan, scan speed: 4.
0 deg. / Min, sampling width: 0.02 deg, start speed: 3.
0 deg, stop angle: 40.0 deg, divergence slit: 0.5
0 deg, scattering slit: 0.50 deg, light receiving slit: 0.3
0mm curved monochrome meter used

The X-ray diffraction measurement after the charge generation layer and the charge transport layer were laminated was performed by cutting a part of the photoreceptor after the application of the charge generation layer and after the application of the charge transport layer, and affixing it to a powder sample cell. Therefore, the X-ray diffraction diagrams of FIGS. 5-1 to 7-2 include the diffraction peak of chloroaluminum phthalocyanine in the charge generation layer and the diffraction peak of aluminum used for the conductive support. . In the figure, 22.4 ° and 24.2 °
And the 38.5 DEG peak are the peaks of the aluminum support.

[0048]

EXAMPLE 1 On an aluminum support, 5 g of methoxymethylated nylon (weight average molecular weight 32,000) and 10 g of alcohol-soluble copolymerized nylon (weight average molecular weight 29,000) were dissolved in 95 g of methanol. The solution was applied with a Myer bar to form an undercoat layer having a thickness of 1 μm after drying.

Next, 3 parts of the crystalline form of chloroaluminum phthalocyanine obtained in Synthesis Example 1 was added to 60 parts of cyclohexanone to polyvinyl butyral (butyralization degree: 63 mol%).
Add 2 parts to the melted solution and add 1mmφ glass bead 10
The mixture was dispersed with 0 parts by a sand mill for 3 hours, and diluted with 100 parts of ethyl acetate. This dispersion was applied to the undercoat layer with a Myr bar so that the film thickness after drying was 0.2 μm to form a charge generation layer.

Next, a charge transport material having the following structural formula

Embedded image 5 parts with polycarbonate (weight average molecular weight 20,000
0) 5 parts were dissolved in 35 parts of monochlorobenzene, and this solution was applied on a charge generation layer with a Myer bar so that the film thickness after drying was 20 μm to form a charge transport layer. In this way, No. 1 electrophotographic photosensitive member was prepared.

FIG. 5-1 shows an X-ray diffraction diagram of the charge generation layer of this photosensitive member. FIG. 5-2 shows an X-ray diffraction diagram after the charge transport layer was laminated.

As shown in FIG. 5A, the crystal of chloroaluminum phthalocyanine was 7.1 ° in the charge generation layer.
The crystal form has a strong peak in
It can be seen that the crystal form having a strong peak at 6.9 ° was rearranged to the above crystal form in the dispersion step.

Further, as shown in FIG. 5B, it can be seen that the same crystal form is maintained even after the formation of the charge transport layer.

In FIG. 5A, there are extremely weak peaks at 11.4 ° and 14.1 ° in addition to the 7.1 ° peak. Does not exist. 2
2.4 °, 24.2 ° and 38.5 ° are peaks of the aluminum support as described above.

Example 2 An electrophotographic photosensitive member of Example 2 was prepared in exactly the same manner as in Example 1 except that the chloroaluminum phthalocyanine obtained in Synthesis Example 2 was used. FIG. 6-1 shows an X-ray diffraction diagram of the charge generation layer of this photoconductor. FIG. 6-2 shows an X-ray diffraction diagram after laminating the charge transport layer.

Example 3 An electrophotographic photoreceptor of Example 3 was prepared in exactly the same manner as in Example 1, except that the dispersing solvent used in Example 1 was changed to cyclopentanone. However, the dispersion time was 6 hours. The crystal form of the photoreceptor after lamination of the charge generation layer and the charge transport layer is strong at 7.0 ° in the same X-ray diffraction pattern as in FIGS. 5A, 5B, 6A, and 6B. It was a crystalline form having peaks.

Example 4 The binder resin used in Example 1 was replaced by a benzal resin represented by the following structural formula (benzalization degree: 80 mol%).

Embedded image The electrophotographic photoreceptor of Example 4 was prepared in exactly the same manner as in Example 1 except that the above was replaced. The crystal forms of the photoreceptor after lamination of the charge generation layer and the charge transport layer are shown in FIGS.
-1 and a crystal form having a strong peak at 7.0 ° in the X-ray diffraction pattern similar to FIG. 6-2.

Examples 5 to 7 The electrophotographic photoreceptors of Examples 5, 6 and 7 were carried out in exactly the same manner as in Example 1 except that the charge transporting material used in Example 1 was changed to a compound having the following structural formula, respectively. It was created.

Compound used in Example 5

Embedded image Compound used in Example 6

Embedded image Compound used in Example 7

Embedded image

Comparative Example 1 An electrophotographic photoreceptor of Comparative Example 1 was prepared in the same manner as in Example 1 except that the dispersion time of the chloroaluminum phthalocyanine in the sand mill was changed from 3 hours to 3 minutes. did. FIG. 7-1 shows an X-ray diffraction diagram of the charge generation layer of this photoconductor. FIG. 7-2 shows an X-ray diffraction diagram after the charge transport layer was laminated.

As shown in FIGS. 7-1 and 7-2, in the present photoreceptor, the crystal form of chloroaluminum phthalocyanine has a peak at 26.9 ° which is the main peak of the crystal form before dispersion. It is the main peak, and it can be seen that there is almost no crystal dislocation.

Comparative Example 2 The chloroaluminum phthalocyanine obtained in Synthesis Example 1 was vacuum-deposited on an aluminum support to a thickness of 2000 angstrom, and then left in saturated THF vapor for about 6 hours to reach 7.0 °. A crystalline charge generation layer having a strong peak was formed. The same charge transport layer as in Example 1 was formed thereon, and an electrophotographic photoreceptor of Comparative Example 2 was formed.

Each of the electrophotographic photosensitive members prepared in the above Examples and Comparative Examples was attached to an aluminum cylinder and set on a laser beam printer (trade name: LBP-SX, manufactured by Canon Inc.). Then, the charging is set so that the dark area potential becomes -700 V, and a laser beam having a wavelength of 802 nm is irradiated to the dark section to measure the light quantity necessary to reduce the -700 V potential to -200 V, and measure the sensitivity. did. Table 1 shows the results.

[0064]

[Table 1] From Table 1, it is known that the electrophotographic photoreceptor of the present invention has extremely high sensitivity characteristics.

Next, in order to examine the repetition characteristics of each photoconductor, the initial dark portion potential Vd and the bright portion potential Vl were set at around -700 V and -200 V, respectively. The fluctuation amount ΔVd and the fluctuation amount ΔVl of the light portion potential were measured. Table 2 shows the results. In addition,
A negative sign in the fluctuation amount of the potential indicates a decrease in the absolute value of the potential, and a positive sign indicates an increase in the absolute value of the potential.

[0066]

[Table 2] From Table 2, it is known that the electrophotographic photoreceptor of the present invention has good potential stability upon repeated use.

FIG. 8 shows the spectral sensitivity of the photosensitive member of Example 2. As a result, the electrophotographic photoreceptor of the present invention is a semiconductor laser.
It can be seen that the laser has extremely high sensitivity near the oscillation wavelength range of 790 ± 20 nm.

[0068]

The electrophotographic photoreceptor of the present invention has a remarkable effect that it has extremely high sensitivity to long-wavelength light and also has good potential stability during repeated use. In addition, it can be mounted on the apparatus unit and the electrophotographic apparatus to provide the same excellent effects.

[Brief description of the drawings]

FIG. 1 is an X-ray diffraction diagram of chloroaluminum phthalocyanine obtained in Synthesis Example 1.

FIG. 2 is an infrared absorption spectrum of chloroaluminum phthalocyanine obtained in Synthesis Example 1.

FIG. 3 is an X-ray diffraction diagram of chloroaluminum phthalocyanine obtained in Synthesis Example 2.

FIG. 4 is an infrared absorption spectrum of chloroaluminum phthalocyanine obtained in Synthesis Example 2.

FIG. 5-1 is an X-ray diffraction diagram of the charge generation layer of Example 1.

FIG. 5-2 X-ray diffraction pattern after laminating a charge transport layer of Example 1

FIG. 6-1 is an X-ray diffraction diagram of the charge generation layer of Example 2.

FIG. 6-2: X-ray diffraction pattern after laminating the charge transport layer of Example 2

FIG. 7-1 is an X-ray diffraction diagram of the charge generation layer of Comparative Example 1.

FIG. 7-2 is an X-ray diffraction diagram after laminating a charge transport layer of Comparative Example 1.

FIG. 8 shows the spectral sensitivity of the electrophotographic photosensitive member of Example 2.

FIG. 9 is a diagram showing a schematic configuration of an electrophotographic apparatus having an apparatus unit provided with the electrophotographic photosensitive member of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electrophotographic photosensitive member of the present invention 2 axis 3 primary charging means 4 image exposure light 5 developing means 6 transfer means 7 transfer material 8 image fixing means 9 cleaning means 10 pre-exposure light 11 process cartridge 12 rail

Claims (7)

[Claims] An electrophotographic photosensitive member having a photosensitive layer on a conductive support, wherein the photosensitive layer is obtained by X-ray diffraction of CuKα obtained by dispersing chloroaluminum phthalocyanine together with an organic solvent and a binder resin. An electrophotographic photoreceptor containing a crystalline form of chloroaluminum phthalocyanine which exhibits the strongest diffraction peak at 7.0 ° at a Bragg angle (2θ ± 0.2 °). 2. An electrophotographic photoreceptor having a photosensitive layer comprising at least two layers of a charge generation layer and a charge transport layer on a conductive support, wherein the charge generation layer comprises chloroaluminum phthalocyanine together with an organic solvent and a binder resin. It contains a crystalline form of chloroaluminum phthalocyanine which shows the strongest diffraction peak at 7.0 ° at a Bragg angle (2θ ± 0.2 °) in X-ray diffraction of CuKα obtained by dispersion treatment. An electrophotographic photosensitive member characterized by the following. 3. The electrophotographic photosensitive member according to claim 1, wherein the organic solvent is an alicyclic ketone solvent. 4. The electrophotographic photosensitive member according to claim 1, and at least one means selected from the group consisting of a charging means, a developing means and a cleaning means are integrally supported, and are detachably attached to an electrophotographic apparatus main body. An apparatus unit, characterized in that: 5. An electrophotographic photoreceptor according to claim 2, and at least one means selected from the group consisting of a charging means, a developing means and a cleaning means, integrally supported and detachably mounted on the electrophotographic apparatus main body. An apparatus unit, characterized in that: 6. An electrophotographic apparatus comprising the electrophotographic photosensitive member according to claim 1, a charging unit, an image exposing unit, a developing unit, and a transferring unit. 7. An electrophotographic apparatus comprising the electrophotographic photosensitive member according to claim 2, a charging unit, an image exposing unit, a developing unit, and a transfer unit.