JPH01312551A - Phthalocyanine dispersion electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To improve the sensitivity in the luminescent wavelength of a semiconductor laser and to environment characteristic of an image quality by specifying the mean particle size of a chlorinated aluminium phthalocyanine having a specified crystal structure as a charge generating agent to a specified range. CONSTITUTION:In a laminated type photosensitive body which mainly liminates a charge generating layer and a charge transfer layer on a conductive substrate plate, the charge generating agent is composed of the chlorinated aluminium phthalocyanine shown by the formula AlClxPcCly wherein the degree of chlori nation x+y=1.0-2.0, Pc is a phthalocyanine ring. The sensitive body has strong diffraction peaks at Bragg angles (2theta+ or -0.2) of 6.7 deg., 11.2 deg., 16.7 deg. and 25.6 deg. in a X-ray diffraction spectral, and a max. absorption of 750-850nm in a transmission absorption spectra and a mean particle size of 0.05-0.03mum. Thus, the sensitive body has the high sensitivity at the luminescent wavelength of the semiconductor laser, and the environment characteristic of the image performance mainly consisting of an electric performance and a fog is improved.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a photoreceptor for electrophotography, and more specifically, the present invention relates to a photoreceptor for electrophotography, and more specifically, it contains a chlorinated aluminum phthalocyanine having photosensitivity up to the semiconductor Rede wavelength as a carrier generator. The present invention relates to an electrophotographic photoreceptor having a layer.

<Prior art> Conventionally, photoreceptors for electrophotography have been put into practical use as photoreceptors sensitive to white light for use in copying machines, and recently semiconductor radar
A photoreceptor has been developed that is sensitive in the wavelength region of 200 nm, and has been put into practical use as a base printer such as semiconductor laser printers and LED (light emitting diode) printers.

In addition, the photoreceptor itself has a layered, functionally separated structure that allows for a wide range of material designs, from the conventional inorganic type using Se-based alloys to organic materials. , high-performance organic photoreceptors are being put into practical use. As a photoreceptor for use in optical printers such as semiconductor radar printers, the required performance is, of course, not only sensitivity at the wavelength of the laser beam, but also different performance from copying machine use.

This is because copying machines and original printers use different developing methods, which creates problems that need to be solved with the photoreceptor. In general, copying machines use the so-called
This is a normal rotation development method, that is, a method in which toner as a developer adheres to portions of the photoreceptor surface where charges exist, in other words, portions with high surface potential. This is related to the exposure method, as light is reflected from the white part of the document and exposed to the photoconductor, which lowers the surface potential of the photoconductor and conversely, the light is absorbed in the text area, causing the photoconductor to absorb light. This is because the surface potential does not drop because it is not exposed to light.

In contrast, optical printers generally use a reversal development method. That is, the reversal development method is a method in which toner as a developer is attached to a portion of the surface of the photoreceptor that has been exposed to light and whose charge has been erased, in other words, a portion of low surface potential. In the case of an optical printer, there is no original document, and the information in the form of electrical signals is converted into light, and 1g! This is to create an original image, and it is generally a reversal exposure method in which a light source emits light in the area corresponding to the characters.

Therefore, in the reversal development method, compared to the normal development method, the toner adheres to areas with a lower potential, so image defects such as black spots on solid white backgrounds and fog are generally more likely to occur. One of the major challenges is to improve it.

In other words, defects in the photoreceptor where there are locally low surface potential areas on the unexposed photoreceptor surface are caused by the reversal development method.
As the toner adheres and melts due to fixation, the area on the printing paper expands, and the toner becomes thicker as black dots and fog on a solid white background. On the other hand, in the case of copying machines, the same defect on the photoreceptor becomes a white spot on a solid black background because the normal rotation development method is used, but during fixing, the toner around the white spot melts in the bath and the area expands. Therefore, on the printed paper, the area of the white dot decreases and becomes less noticeable, resulting in a damping effect. Therefore, in order to completely eliminate image defects during printing, two improvements are being made: one is to improve the electrophotographic settings of the printer device itself, and the other is to improve the photoreceptor itself.

Various attempts have been made to improve the photoreceptor,
In particular, two studies have been conducted on the laminated structure and assembly materials. For example, in the case of a functionally separated laminated structure as the structure of the photoreceptor, basically, on an Al drum as an electrode, there is a charge generation layer that generates charges by light and a charge transfer layer that moves the generated charges. Although a two-layer structure is sufficient, in reality, another layer is added.

For example, a conductive layer with a thickness of 10 to 20 μm with a certain resistance is provided as an underlayer on an Al drum, and a barrier layer is provided on top of the conductive layer to prevent charge injection from the electrode.
The above charge generation 1-1 charge transfer layer is provided thereon41
- Examples of configurations. Alternatively, a 31f4 structure is adopted in which the underlayer is omitted and a barrier I-1 charge generation layer and a charge transport layer are provided.

That is, the current situation is to assume the cause of each defect and take countermeasures by improving the Al drum, charge generation layer, or charge transfer layer, or adding other layers.

Furthermore, what is important as an issue is that these image defects are not only solved under normal temperature and humidity environments, but also in low temperature, low humidity (e.g. 10°C, 25%) and high temperature and high humidity (e.g. 65°C, 80°C) environments. %].A further question is whether the environmental characteristics of the electrical performance, which is the basis of the electric performance, will be a problem.This is because the charge generation layer and the charge transport layer are In the case of two layers, in order to optimize the electrical characteristics for the environment of the two layers,
All you need to do is design the film thickness and composition, but if you create a 3-layer structure by adding a barrier layer and a 4-layer structure by adding a base layer for the purpose of improving image defects, you will need to design the environmental characteristics of those layers. At present, it is extremely difficult to eliminate image defects such as black spots on a solid white background and fog, and to optimize environmental characteristics at the same time.

<Problems to be Solved by the Invention> The present invention has high sensitivity mainly at the emission wavelength of semiconductor chips, and has improved electrical performance and image performance environments such as black spots and fog in solid white printing during reversal development. This is an attempt to solve the problem that an electrophotographic photoreceptor with good characteristics cannot be obtained.

By using chlorinated aluminum phthalocyanine with a specific crystal structure, we can obtain an electrophotographic photoreceptor with high sensitivity at the emission wavelength of semiconductor radar, but in reality, the electrical performance and The reality is that the environmental characteristics of image performance vary widely and are difficult to maintain.

Therefore, in order to provide a practical electrophotographic photoreceptor, it is a problem that must be solved by identifying the factors that cause variations in these characteristics and controlling those factors.

Means for Solving the Problems> In order to improve the above-mentioned drawbacks, the present inventors have made intensive studies and determined that the average particle size of chlorinated aluminum phthalocyanine having a specific crystal structure as a charge generating agent is It was discovered that an electrophotographic photoreceptor with good reproducibility could be obtained by using a standard pattern, and the present invention was completed.

That is, the present invention provides a laminated electrophotographic photoreceptor in which a charge generation layer and a charge transport layer are mainly laminated on a conductive substrate, wherein the charge generation agent is chlorinated aluminum phthalocyanide (AJ (JxP)).
cCjy (degree of chlorination: X+Y=1.0-2.0.Pc
:phthalocyanine ring)] and the Bragg angle (2θ±0.2 degrees) is 6.7 degrees in the X-ray diffraction spectrum.
It has strong diffraction peaks at 11.2 degrees, 16.7 degrees, and 25.6 degrees, b) It has a maximum absorption between 750 nm and 850 nm in the transmission absorption spectrum, and C) The average particle size is 0.05 μm. This is an electrophotographic photoreceptor characterized by having a particle size of −0.03 μm or less.

The chlorinated aluminum phthalocyanine used in the present invention can be easily synthesized by causing a condensation reaction of phthalodinitrification and aluminum chloride under heating in a solvent-free medium. The obtained chlorinated aluminum 7-talocyanine is repeatedly washed with an organic bath agent and water to remove impurities, and further, trace impurities are removed by sublimation purification to obtain a highly pure product.

In order to use the chlorinated aluminum 7-thalocyanine as a charge generation layer of an electrophotographic photoreceptor in the present invention, the sublimation-purified chlorinated aluminum phthalocyanine is wet-pulverized with an organic solvent containing a specific water content j1. It can be obtained by performing dispersion treatment to change the crystal type and control the particle size.

The organic solvent used here has an affinity for chlorinated aluminum phthalocyanine, but its solubility is limited.
Solvents that are not expensive, such as toluene, oxygen, acetic acid: r
Methanol, ethanol, tetrahydrofuran, etc., which are strong and have high solubility, such as -fl, dichloromethane, chloroform, chlorobromomethane, and nitroethane, are not preferred because they dissolve the chlorinated aluminum 7-talocyanine and do not form an effective crystal form. Furthermore, the amount of water contained in the dissolved state in the organic solvent needs to be adjusted so that there are two or more molecules of water per one molecule of 7-thalocyanine.

When chlorinated aluminum phthalocyanine is wet-pulverized and dispersed with an organic solvent containing water,
As shown in Figure 1 (b), the crystal form of the crystal type is 6.7 degrees, 11.2 degrees, 1
Strong diffraction angles are seen at 6.7 degrees and 25.6 degrees. The XIIA diffraction pattern of the crystal form of 7-thalocyanine after sublimation purification is 20±0 as shown in Figure 1(a).
．． Since a strong diffraction angle is seen at 27.0 degrees, it can be seen that the grain size becomes smaller and the crystallization density changes during the wet grinding and dispersion process. In addition, as shown in Figure 2, the transmission absorption spectrum is also on the longer wavelength side when subjected to wet grinding and dispersion treatment together with an organic solvent containing specific water Jl, compared to when no treatment is performed with only sublimation purification. (between 750nm and 850nm)
The maximum absorption shifts to . Therefore, in the emission wavelength range of semiconductor lasers (770 nm to 830 nm),
This becomes a charge generating agent for an extremely sensitive electrophotographic photoreceptor.As will be described later, the charge generating agent thus obtained is used to form a charge generation layer to produce an electrophotographic photoreceptor. As mentioned above, it shows very high sensitivity, but the electrical performance and image performance, especially the environmental characteristics, are not constant, and although good results can be obtained, problems with reproducibility remain.

Therefore, the electrophotographic photoreceptor /? ! As a result of careful consideration of the composition of the r layer, the structure of the layered structure, etc., the average particle size of the chlorinated aluminum phthalocyanine forming the charge generation layer was found to be
It has been found that environmental characteristics such as electrical performance and image performance such as sunspots and fog are greatly affected. In other words, charge generating agents with various average particle sizes were created by changing the dispersion machine and dispersion conditions, and the correlation with performance was evaluated. As the average particle size became smaller, the dark decay rate at room temperature and humidity decreased. The temperature and humidity of the casing (e.g. 10°C
It has become clear that there is less change in electrical performance when exposed to high temperature (160%) and high temperature and high humidity (e.g. 65°0180%) compared to normal temperature and humidity, and that there is less fogging in these environments. . In particular, when the particle size of phthalocyanine is large, the dark decay rate is large at high temperature and high humidity, and as a result, the surface potential (■0) when not exposed to light is significantly lower than at room temperature, and as a result, the fog when solid white is also large. It is. For this reason, it is desirable that the average particle size of the chlorinated aluminum 7-talocyanine be 0.05 μm or less in order to obtain good performance. Obtaining such a particle size can be achieved by selecting a disperser with high crushing and dispersing ability and optimizing the dispersion time.

Further, the smaller limit of the average particle diameter is preferably 0.03 μm from the viewpoint of pulverization and dispersion ability. In other words, the conventional problem can be solved by performing wet grinding treatment with an organic solvent containing the above-mentioned specific water content to change the crystal type and at the same time control the average particle size within the optimal range. It is possible to resolve the issue.

The average particle size here refers to the British Joyce-Loeb1
High-speed centrifugal sedimentation continuous particle size distribution measuring system DCF
-4. There are generally various methods for measuring the particle size of dispersed particles such as phthalocyanine. The high-speed centrifugal sedimentation continuous particle size distribution measuring system DCF-4 manufactured by Joyce-Loeb 1 in the UK has a diameter of 0.1μ.
This is an evaluation system that can accurately measure particle diameters below rIL. The principle of this measurement method is based on Stokes' centrifugal sedimentation equation. However, in order to accurately measure the microparticle diameter t, high-speed rotation (10,000 rpm) is performed, and in order to start stable sedimentation starting from the largest particles, the dispersion to be measured is placed in a solution called a spin solution and a buffer solution. Efforts have been made to inject it. Actually, 0.211 L of a phthalocyanine dispersion was used as a sample.

A mixed solvent of nitroethane/chlorobromomethane (110.31wz%) was used as the solution. Nitroethane II was used as the buffer solution.

The particle size distribution of the phthalocyanine thus obtained is subjected to statistical processing to obtain the average particle size referred to in this patent.

To use the chlorinated aluminum phthalocyanine of the present invention as a charge generation layer at °C, the charge generation layer is provided on a conductive substrate. metals can be used. When in the form of a drum, aluminum is preferred.

In addition, in order to improve memory resistance and image defects caused by the effects of the conductive substrate, a zinc oxide layer or alcohol-soluble polyamide layer with polyvinyl alcohol as a binder is provided on the conductive substrate to a thickness of 1 μm or less. You can.

Moreover, in the case of aluminum, the surface is alumite-treated to form an alumite layer of 0.1 μm to 10 μm, and the temperature is also good.

The chlorinated aluminum phthalocyanine used as the charge generation layer is obtained by pulverizing the sublimation-purified product in the above-mentioned organic solvent using a wet pulverizing and dispersing machine, and can be used as it is, or with acrylic resin, styrene resin, A binder such as alkyd resin, polyester resin, polyamide resin, or polycarbonate resin can be solution-coated onto a conductive substrate together with a bath agent to form a charge generation layer. The amount of the binder used in this case is not particularly limited, but it is used in an amount of 20 parts by weight to 600 parts by weight per 100 parts by weight of chlorinated aluminum phthalocyanine. The thickness of the charge generation layer at this time is 0.02 in the case of solution coating.
It is desirable to apply the film to a thickness of μm to 5 μm.

A charge transfer layer is laminated on top of the chlorinated aluminum phthalocyanine charge generation layer prepared as shown in arrow 1 to form a photoreceptor. The layer that is transferred to the surface of the photoconductor must be transparent to light in the photosensitive wavelength range of the charge generation layer. It is necessary to appropriately match the energy levels (ionization potential, electron affinity, etc.) between the layers, and the charge transfer agent alone or dissolved in a binder resin,
Used in dispersed form.

As a sole transfer agent, 2,6-zomethquine-9.10
Polyesters obtained from -dihydroxyanthracene and dicarboxylic acids, polyethers obtained from 2,6-simethoxy9,10-dihydroxyanthracene and zohalogone compounds, and polyvinylcarbazole can be used.

Transfer agents used dispersed in the binder resin include 2, S,
9. A/thracene derivatives such as 10-tetrainzolophoxyanthracene, oxazoazoles such as 2.5-bis(4-diethylaminophenyl)-1,3,4-oxadiazole, 1-phenyl-3- Pyrazoline derivatives such as CP-diethylaminostyryl/')-5-CP-diethylaminophenyl)-chirazoline, styryl compounds such as 4-(diethylamino)styryl-2-anthracene, P-diethylaminobenzaldehyde-(diphenylhydrazone), etc. The following hydrazone compounds can be used.

In addition, as the binder resin of the transfer agent, polyvinyl chloride,
Examples include polycarbonate, polystyrene, polyester, styrene-butadiene copolymer, polyurethane, epoxy resin, polyether ketone, and the like. The binder resin is used in an amount of 60 to 200 parts by weight per 100 xii parts of the transfer agent. The thickness of the charge transfer layer at this time is not particularly limited, but is suitably 10 to 25 .mu.m in view of the reception level.

<Examples> The present invention will be explained in more detail with reference to Examples below, and comparative examples will be listed.

Example 1 5 parts by weight of chlorinated aluminum phthalocyanine obtained by sublimation purification (degree of chlorination according to CL analysis value:
The mixture was charged into a sand mill disperser together with a liquid dissolved in a mixed organic solvent containing parts by weight and 60 parts by weight of nitroethane, and wet-pulverized and dispersed at room temperature for 6 hours and 9 hours. Although the wet grinding and dispersion was carried out for 6 hours and 9 hours, the average particle size of the phthalocyanine particles was 0.05μff1.0.03, respectively.
It was μm. The particle size of the phthalocyanine particles was measured using a high-speed centrifugal sedimentation continuous particle size distribution measurement system DCF-4 manufactured by JOYCE LOEBL, UK.

In addition, the crystalline state of the phthalocyanine was determined using an X-ray diffraction device. In the X-ray diffraction spectrum, the Bragg angle (20±0.2 degrees) is 6.
Strong diffraction e-reflection was observed at 7 degrees, 11.2 degrees, 16.7 degrees, and 25.6 degrees. Further, the transmission absorption spectrum of this coating liquid dried on glass showed a transmission absorption maximum at 830 nm.

Acrylic resin (n-butyl methacrylate/1-butyl methacrylate/2-hydroxyethyl methacrylate =
45/45/10 copolymer) and 0.6 parts by weight of pure water.
A dispersion of 60 parts by weight was obtained by dispersing a solution prepared by dissolving 16 parts by weight in a mixed organic solvent of 180 parts by weight of chlorbromomethane and 90 parts by weight of nitotsuyutan. A coating solution was obtained by diluting the solution. In order to obtain an electrophotographic photoreceptor, 1 part of copolymerized nylon (cM8000 manufactured by Toshi) 802iJ, styrene/
Maleic acid half ester copolymer resin (manufactured by BASF)
Supra Pearl AP-20) 20! Mix several parts and dissolve in methanol to give a concentration of 2% by weight, until the dry thickness is 0.
A coating film of 8 μm was prepared and used as a barrier layer. On top of that, the coating liquid containing the charge generating agent obtained earlier was applied by dip coating at 100°C.
After drying for 1 hour, a charge generation layer having a dry film thickness of 1 μm was obtained.

On top of this is polyetherketone 10! Quantity part, P-diethylaminobenzaldehyde-(diphenylhydrazone) 1
A bath liquid consisting of 0 parts of TL and 100 parts of 1,2-dicfluethane was applied by dip coating, and dried at 80° C. for 1 hour to form a charge transfer # having a dry film thickness of 15 μm, which was used as an electrophotographic photoreceptor. Electrical performance evaluation and image performance evaluation were carried out using a commercially available semiconductor laser. A scorotron charger with a negative charge and a grid voltage of 830 V was used for charging, and the charging conditions were 4.6 μ per unit length for an aluminum drum without a photosensitive layer.
A/G:! ! It was set so that an inflow current of L flows.

In addition, the drum rotation speed is 90B/sec T:Eraser energy and °C is red light 20μJ/nm
It was set as 2. The surface potential when there is no laser exposure is ■0, and the laser exposure J! 2.1 μJ/c7I
L2 exposure (emission wavelength: 780 nm) was performed, and the image potential Vi was measured. Further, dark decay was measured as a rate of potential decrease for 5 seconds during no exposure. Further, the image performance was evaluated by visual evaluation of a printed sample printed using a reversal two-component development method. The results of the evaluation are shown in the first garment along with comparative examples. The environmental characteristics of both electrical performance and image performance are good.

Comparative Example 1 Same as Example 1, but the dispersion time in the sand mill dispersion machine was 1.
A dispersion coating liquid was obtained under the same conditions except for the time. The average particle size was 0.06 μm, and the X-ray diffraction spectrum and absorption spectrum were the same as in Example 1. An electrophotographic photoreceptor was obtained under the same conditions as in Example 1, and its characteristics were evaluated. The evaluation results are as shown in the first example, and both the electrical performance and the environmental characteristics of the image performance are worse than in Example 1.

Comparative Example 2 A dispersion coating liquid was obtained in the same manner as in Example 1 except that a ball mill disperser was used instead of the sand mill disperser and pulverization was carried out at room temperature for 120 hours. The average particle size is 0.
07 μm, and the X-ray diffraction spectrum and absorption spectrum were the same as in Example 1. An electrophotographic photoreceptor was obtained under the same conditions as in Example 1, and its characteristics were evaluated. The evaluation results are shown in Table 1, and both the electrical performance and the environmental characteristics of the image performance are worse than in Example 1.

Example 2 Materials having the same composition as in Example 1 were charged into a sand mill disperser, and the temperature condition was such that the internal liquid temperature was -20°G for 6 hours.
Wet pulverization and dispersion was carried out for 9 hours. When the average particle size of phthalocyanine was measured using the same method as in Example 1, the average particle size when dispersing for 6 hours and 9 hours was as follows:
The oxH diffraction spectrum and absorption spectrum, which were 0.05 μm and 10.03 μm, were the same as in Example 1. - Soluble polyester (manufactured by Toyobo, Byron 20)
0) Dissolve 1.6 parts by weight of 11 parts of pure water and 0.16ml of pure water in a mixed organic solvent consisting of 180 parts of chromium bromomethane and 90 parts by weight of nitroethane. A coating liquid was obtained by pouring the dispersion into 60 parts of violet and diluting it. In order to obtain an electrophotographic photoreceptor, 1-go nylon (manufactured by Toshi, 0M4001) was placed on an aluminum drum.
) 80 parts, styrene/maleic acid 7-ester copolymer resin (BASF split, Suzola Pearl Ap-20)
By mixing 20 mit parts and applying a coating solution resistant to methanol so that the amount was 2]L, a coating film having a dry thickness of 0.07 μm was formed, which was used as a barrier layer. A charge generating layer having a dry thickness of 0.degree. to 1 .mu.m was obtained by dip coating the previously obtained heavy liquid rich in the charge generating material thereon. Polycarbonate resin (manufactured by Mitsubishi Gas Chemical, Z
-200) 10 parts by weight, P-diethylaminobenzaldehyde-(diphenylhydrazone) 10 parts by weight, 1.2
- By dipping coating a coating solution consisting of 100,311 parts of dichloroethane and drying at 80°C for 1 hour, a dry film thickness of 2
A charge transfer layer of 0 ttm was formed to prepare an electrophotographic photoreceptor. The results of evaluating the characteristics are shown in Table 2, and both the electrical performance and the environmental % environmental performance of the image performance are good.

Comparative Example 6 In Example 2, the dispersion time in the sand mill disperser was reduced to 1
A dispersion coating liquid was obtained under the same conditions except for the time. The average particle size was 0.06 μm, and the XlfM diffraction spectrum and absorption spectrum were similar to those in Example 2. An electrophotographic photoreceptor was obtained under the same conditions as in Example 2, and its characteristics were evaluated. The evaluation results are as shown in the second thorn, and are the environmental characteristics of electrical performance and image performance both tested? It's worse than jJ 2.

Comparative Example 4 A dispersion coating liquid was obtained in the same manner as in Example 2 except that a sand mill disperser was used instead of the sand mill disperser and pulverization was carried out for 120 hours at a liquid temperature of -15°C. The average particle size is 0.07 μm, and the X-ray diffraction spectrum and
The absorption spectrum was the same as in Example 2. Example 2
An electrophotographic photoreceptor was obtained under the same conditions as above, and its characteristics were evaluated. The evaluation results are as shown in Part 2, and both the electrical performance and the environmental characteristics of the image performance are worse than in Example 2.

Example 6 Wet grinding and dispersion was performed using the same materials and dispersion conditions as in Example 2. The average particle diameter, X-ray diffraction spectrum, and absorption spectrum of the obtained phthalocyanine were the same as in Example 2. An electrophotographic photoreceptor was obtained under the same conditions as in Example 2, except that an acrylic resin (Acridic A-808, manufactured by Dainippon Ink) was used instead of the soluble polyester when obtaining the coating solution. The results of evaluating the characteristics of the obtained photoreceptor are as shown in the third thorn, and the environmental characteristics of both electrical performance and image performance are good.

Comparative Example 5 In Example 3, Comparative Example 3 was used when performing wet pulverization and dispersion.
The same materials and dispersion conditions were used. The average particle size, x1fM diffraction spectrum, and absorption spectrum of the obtained 7-talocyanine were the same as those in Comparative Example 6. An electrophotographic photoreceptor was obtained under the same conditions as in Example 3 except for obtaining this dispersion coating liquid, and its performance was evaluated. The evaluation results are as shown in the third example, and both the electrical performance and the environmental characteristics of the image performance are worse than in Example 3.

Comparative Example 6 In Example 6, when performing wet pulverization dispersion, Comparative Example 4
The same materials and dispersion conditions were used. The average particle size, X-ray diffraction spectrum, and absorption spectrum of the obtained phthalocyanine were the same as those in Comparative Example 4. An electrophotographic photoreceptor was obtained under the same conditions as in Example 3 except for obtaining this dispersion coating liquid, and its performance was evaluated. The evaluation results are as shown in Section 6, and the environmental characteristics of both electrical performance and image performance are as shown in Example 6.
It's worse than.

<Effects of the Invention> The electrophotographic photoreceptor of the present invention has a charge generation layer containing chlorinated aluminum phthalocyanine as a charge generation agent.
It exhibits high sensitivity at the emission wavelength of semiconductor lasers, and has excellent environmental characteristics in terms of electrical performance and image performance, mainly in terms of fog, making it suitable as a practical photoreceptor for semiconductor laser printers.

[Brief explanation of the drawing]

Figure 1 shows CuKa of chlorinated aluminum phthalocyanine.
X-ray diffraction spectrum when a line is used as a radiation source. Figure 2 shows the transmission absorption spectrum. In the figure, (a) shows the case of sublimation n-manufacturing, before wet pulverization and dispersion. (b) shows the case after wet pulverization and dispersion of a specific amount of water with an organic solvent. Patent Applicant: Asahi Kasei Kogyo Co., Ltd. 噸@ze-Aman@＊h-1 Procedural Amendment 1. Description of the case 1986 Patent Application No. 143604 2 Name of the invention Phthalocyanine dispersed electrophotographic photoreceptor 3 Person making the amendment Relationship to the case Patent applicant 1-2-6-4 Dojimahama, Kita-ku, Osaka-shi, Osaka Prefecture , Subject of amendment 5, Contents of amendment 1) The claims are amended as shown in the attached sheet. 2) Claim characterized in "the following" in Item 8, Line 7 of the specification: A laminated electrophotographic photoreceptor in which a charge generation layer and a charge transfer layer are mainly laminated on a conductive substrate, wherein the charge generation agent is Chlorinated aluminum phthalocyanine (AIClxPc)
Cly (degree of chlorination: X+Y=1.0-2.0.Pc:
phthalocyanine ring)], a) In the X-ray diffraction spectrum, the Bragg angle (2θ ± 0.2 degrees) is 6.7 degrees, 1
It has strong diffraction peaks at 1.2 degrees, 16.7 degrees, and 25.6 degrees, b) has a maximum absorption between 750 nm and 850 nm in the transmission absorption spectrum, and C) has an average particle size of 0.05 μm ~ A globular body for electrophotography characterized by having a 0.03L engineering T-. e

Claims (1)

[Claims] A laminated electrophotographic photoreceptor in which a charge generation layer and a charge transfer layer are mainly laminated on a conductive substrate, wherein the charge generation agent is chlorinated aluminum phthalocyanine [AlCl_x
PcCl_y (degree of chlorination: X+Y=1.0-2.0, P
c: phthalocyanine ring)], a) Bragg angle (2θ±0
．． 2 degrees) are 6.7 degrees, 11.2 degrees, 16.7 degrees, and 25.
It has a strong diffraction peak at 6 degrees b) from 750 nm to 850 nm in the transmission absorption spectrum.
1. A cold photothermant for electrophotography, characterized in that: c) it has an average particle size of 0.05 μm to 0.03 μm or less;