JP2002131952A - Electrophotographic photoreceptor and electrophotographic device which uses the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor showing both of high resolution and high sensitivity and to provide an electrophotographic device which uses the photoreceptor. SOLUTION: The electrophotographic photoreceptor has a photosensitive layer on a conductive supporting body and contains crystal type oxotitanylphthalocyanine having such properties that the X-ray diffraction spectrum for CuKα characteristic X-rays (1.5418 Å) shows overlapped peaks at 9.4 deg. and 9.6 deg. Bragg angles (2θ±0.2 deg.) as the maximum peak and the peak at 27.2 deg. as the second highest peak. Further, the photosensitive layer contains an X-type nonmetal phthalocyanine having peaks at 7.5 deg., 9.1 deg., 16.7 deg., 17.3 deg., 22.3 deg.. The electrophotographic photoreceptor is mounted in the electrophotographic device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-resolution and high-sensitivity electrophotographic photosensitive member and an electrophotographic apparatus using the same.

[0002]

2. Description of the Related Art F. The electrophotography technology according to the invention of Carlson is widely used in various printers and facsimiles in recent years, not only in the field of copiers but also in the fields of printers and facsimiles because of the ability to obtain images with immediacy, high quality and high storability. Is showing. This electrophotographic process is basically composed of “uniform charging of a photoreceptor”, “formation of an electrostatic latent image by image exposure”, “development of the latent image with toner”, “transfer of the toner image to paper ( Intermediate process), and an image formation by fixing.

[0003] As for the photoreceptor which is the core of the electrophotographic technology, a conventional photoconductive material such as Se, As-S
From inorganic photoconductive materials such as e-alloy, CdS, and ZnO, recently, organic photoconductive materials that have advantages not found in inorganic materials such as pollution-free, easy film formation, and easy manufacturing are used. Photoconductors have been developed. Above all, the so-called stacked type photoreceptor, in which a charge generation layer composed of a substance having a high charge generation function and a charge transport layer composed of a substance having a high charge transport function, has a limited function in each layer As a result, it is possible to obtain a highly safe photoreceptor with a wide selection of materials, obtain a more sensitive photoreceptor, and because it can be manufactured by coating, it has high productivity and is advantageous in terms of cost. At present, photoconductors are the mainstream and are mass-produced.

In recent years, with the digitization of image information, etc.,
Instead of conventional white light, semiconductor laser or LE
Image information is recorded by exposing a photosensitive layer with a semiconductor laser beam or an LED array beam using a D array as a recording light source. At present, a near-infrared light of 780 nm or a red light source of 650 nm is most often used as an exposure light source for the photosensitive layer. When information such as characters is directly used as a computer output, the digitized image information is recorded on the photoconductor by the output information of the computer converted into an optical signal. Is input, the image information of the original is read as optical information, converted into a digital electric signal, then converted again into an optical signal, and the image information is recorded on the photoreceptor by the optical signal. You.

In each case, image information is recorded on the photosensitive layer by a minute light spot irradiated on the photosensitive layer from an optical recording head, a recording optical system, or the like.
The portion irradiated with the light spot is developed by the toner. An image is represented by a set and arrangement of small dots called pixels developed by toner. For this reason, in an optical recording head, a recording optical system, and the like, a high resolution is being promoted so that a spot as small as possible can be formed so that image information is recorded at a high density. Optical systems for recording image information on the photosensitive layer include variable spot laser recording (Oplus E May 1996), multi-laser beam recording, ultra-precision and ultra-high-speed polygon mirrors (Japan Hardcopy '96, etc.) Is being developed. As a result, at present, 1200
An optical system for recording image information on a photosensitive layer at a recording density of at least dpi (dot / inch: the number of dots per inch) has been developed.

Even if an optical system for recording image information at a high density on the photosensitive layer is developed as described above, it is not always easy to record the image information on the photosensitive layer as an electrostatic latent image with good reproducibility. This is characterized in that the laser light has a Gaussian distribution in which the light intensity distribution is strong in the center and spread in the periphery. A conventional high-sensitivity electrophotographic photoreceptor is exposed to light that has spread to the peripheral portion and is developed, so that the dots are widened and it is difficult to achieve high image quality.
As a high-sensitivity electrophotographic photosensitive member, Patent Registration No. 1950
No. 255 and Japanese Patent No. 2128593 disclose a so-called Y-type crystal oxotitanyl phthalocyanine,
As another example, JP-A-10-237347 discloses a novel crystalline oxotitanyl phthalocyanine.

Further, as an electrophotographic photoreceptor using two or more kinds of phthalocyanines for the purpose of increasing the sensitivity at around 780 nm, which is the emission wavelength of a semiconductor laser, Japanese Patent No. 2,780,295 discloses an oxotitanyl phthalocyanine and a metal-free phthalocyanine. Mixed Crystal, Patent Registration No. 275
No. 4739 proposes an electrophotographic photosensitive member using a composition of oxotitanyl phthalocyanine and metal-free phthalocyanine. However, these high-sensitivity photoconductors have high sensitivity even to weak exposure, and cannot realize high resolution for the above-described reason. As a photoreceptor in which two kinds of phthalocyanines are mixed, Patent Registration No. 300
Japanese Patent No. 5052 proposes a photoreceptor in which a specific crystalline oxotitanyl phthalocyanine is mixed with a metal-free phthalocyanine, and Japanese Patent Application Laid-Open No. Hei 5-134337 proposes a photoreceptor in which two types of specific crystalline oxotitanyl phthalocyanine are mixed. Although the resolution is slightly improved, it is still insufficient.

[0008]

As means for realizing high resolution, a low-sensitivity photoreceptor is used, and the sensitivity to such peripheral light is reduced so that only the strong light at the central portion is exposed. There is a method of forming a simple dot. However, this method was sufficient for slow printers,
Such photoconductors have low sensitivity due to the progress of speeding up, and require a high-output semiconductor laser because of their low sensitivity, and the residual potential is high, especially at low temperatures, and the image density decreases in the reversal development process. And other problems have occurred.
At present, it has not been possible to achieve both high sensitivity and high resolution.

[0009]

As a result of intensive studies to develop a photoreceptor that achieves both high sensitivity and high resolution, a specific crystalline oxotitanyl phthalocyanine and an X-type metal-free phthalocyanine were mixed as charge generating substances. The present invention has been completed by using this method. As shown in FIG. 5, the photoreceptor of the present invention is not a photoreceptor having high sensitivity to small exposure energy (comparative photoreceptor B), but has little light attenuation for weak exposure and high sensitivity for strong exposure. Thus, a highly sensitive photoconductor (photoconductor A) that completely attenuates the potential and responds linearly to exposure energy. The reason why a desired light decay curve can be obtained by mixing the X-type non-metallic phthalocyanine with the oxotitanyl phthalocyanine of the present invention is not clear, but in a single-layer photoreceptor using the non-metallic phthalocyanine, a certain light exposure A photoreceptor having a so-called high gamma-type photopotential decay characteristic has been reported, in which the potential does not attenuate until the temperature reaches a certain level, and a sharp potential decay occurs when a certain exposure amount is exceeded.

It is considered that the X-type metal-free phthalocyanine in the mixture of the present invention exists while maintaining this property. That is, in the weak exposure region, the characteristic of the metal-free phthalocyanine is dominant and the light attenuation is small, and in the strong exposure region, the high-sensitivity characteristic of the oxotitanyl phthalocyanine of the present invention and the high gamma steep potential decay of the metal-free phthalocyanine are dominant. It is presumed that a desired light attenuation curve that is linear with respect to the exposure amount as a whole may be obtained. On the other hand, it is considered that such a high-gamma-like property of metal-free phthalocyanine is lost in the form of a mixed crystal which changes the crystal form itself, which has been reported conventionally. That is, in the first embodiment of the present invention, a specific two types of phthalocyanines are used as the charge generating substance, in the second, the content ratio of the two types of phthalocyanines is specified, and in the third, the content ratio of the two types of phthalocyanines is specified. In 4 to 7, the charge transport material is specified, in the eighth, an intermediate layer is provided between the conductive support and the photosensitive layer, in the ninth, the exposure light source is specified, and in the tenth, the developing method is specified. Thus, the present invention has been completed.

(Operation) With the above configuration, an electrophotographic photosensitive member having both high resolution and high sensitivity and an electrophotographic apparatus using the same can be realized.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The configuration of the electrophotographic photoreceptor of the present invention includes a laminated electrophotographic photoreceptor in which a photosensitive layer is composed of two layers, a charge generation layer and a charge transport layer, as shown in FIG. A single-layer photoreceptor containing a charge transport material and a charge generating material, a laminated electrophotographic photoreceptor having an undercoat layer as an intermediate layer between a conductive support and a photosensitive layer as shown in FIG. As described above, a single-layer type electrophotographic photosensitive member is provided with an undercoat layer as an intermediate layer between the conductive support and the photosensitive layer. Examples of the conductive support include metal materials such as aluminum, aluminum alloy, stainless steel, iron, gold, silver, copper, zinc, nickel, and titanium; aluminum, gold, silver, copper, nickel, indium oxide, and oxide. A plastic substrate on which tin or the like is deposited,
Polyester film, paper, plastic or paper containing conductive particles, plastic containing conductive polymer, or the like can be used. As their shapes, drums, sheets, seamless belts and the like can be used.

As the charge generating substance of the present invention, two specific phthalocyanine compounds are used. Specifically, it has the following structural formula (5), and has a Bragg angle (2θ ± 0.2 °) of 9.4 ° and 9.5 in the X-ray diffraction spectrum with respect to CuKα ray.
The 6 ° overlapping peak bundle shows the largest peak and 2
Oxotitanyl phthalocyanine, which is a crystal form in which the peak at 7.2 ° shows the second maximum peak, and 7.5 °, 9.1
X-type metal-free phthalocyanine having peaks at °, 16.7 °, 17.3 °, and 22.3 ° is used.

[0014]

Embedded image (In the formula, X represents a hydrogen atom, a halogen atom, an alkyl group, or an alkoxy group, and t, u, v, and w each represent an integer of 0 to 4.) The mixing ratio is preferably X-type non-metal. The phthalocyanine content is 10% of oxotitanyl phthalocyanine.
To 70% by weight, more preferably 40 to 70% by weight.
It is.

In the case of a laminate type electrophotographic photoreceptor, as a method for producing the charge generation layer, an organic solvent is added to the fine particles of the phthalocyanine compound, and the fine particles are pulverized and dispersed by a ball mill, a sand grinder, a paint shaker, an ultrasonic disperser or the like. The coating liquid obtained by the above method is prepared by a baker applicator, bar coater, casting, spin coating or the like in the case of a sheet, or by a spraying method, a vertical ring method, or a dip coating method in the case of a drum. As a binder resin to increase the binding property, for example, polyester resin, polyvinyl acetate, polyacrylate, polycarbonate, polyarylate, polyvinyl acetoacetal, polyvinyl propionate, polyvinyl butyral, phenoxy resin, epoxy resin, urethane Various binder resins such as resin, melamine resin, silicone resin, acrylic resin, cellulose ester, cellulose ether, and vinyl chloride-vinyl acetate copolymer resin may be added. The thickness is usually preferably from 0.05 to 5 μm, particularly preferably from 0.1 to 1 μm. The charge generation layer may contain various additives such as a leveling agent, an antioxidant, and a sensitizer for improving coating properties, if necessary.

The charge transporting layer is mainly composed of a charge transporting substance and a binder resin.
Electron withdrawing substances such as 7-trinitrofluorenone, tetracyanoquinodimethane, diphenoquinone, carbazole, indole, imidazole, oxazole, virazole, oxadiazole, pyrazoline, heterocyclic compounds such as thiadiazole, aniline derivatives, hydrazone compounds, aroma Group III amine derivatives, styryl compounds, enamine compounds, or electron donating substances such as polymers having a group consisting of these compounds in the main chain or side chain, particularly, specific styryl compounds, bisamine compounds and Butadiene compounds have high mobility and are therefore suitable for high sensitivity and high resolution. These charge transport materials may be used alone or in combination of two or more.

The following are specific examples of the styryl compound used in the present invention.

Embedded image

The following are examples of the bisamine compound.

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[0019]

Embedded image

The following are examples of the butadiene compound.

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The charge transporting layer is formed in a state where these charge transporting substances are bound to the binder resin. As the binder resin used in the charge transport layer, for example, polycarbonate, polymethyl methacrylate, polystyrene, vinyl polymers such as polyvinyl chloride, and copolymers thereof, polyester, polyester carbonate, polyarylate, polysulfone, polyimide, poly Phenoxy, epoxy resin, silicone resin and the like can be mentioned, and partially crosslinked and cured products thereof can also be used.

The ratio between the binder resin and the charge transport material is
Usually, 30 to 20 parts by weight per 100 parts by weight of the binder resin.
0 parts by weight, preferably in the range of 40 to 150 parts by weight. The film thickness is generally 5 to 50 μm, preferably 10 to 45 μm. In addition, the charge transport layer, in addition to the additives of the present invention, well-known plasticizers for improving film formability, flexibility, applicability, antioxidants, ultraviolet absorbers, leveling agents and the like An additive may be contained. These charge transport layers are applied on the charge generation layer in a similar device.

In the case of a single-layer type electrophotographic photoreceptor, a specific oxotitanyl phthalocyanine and an X-type non-metallic phthalocyanine as the charge generating material of the present invention are contained in the charge transporting layer having the above-mentioned compounding ratio as the photosensitive layer. Distributed. In this case, the particle size must be sufficiently small, and preferably 1 μm.
m or less. If the amount of the charge generating substance dispersed in the photosensitive layer is too small, the sensitivity is insufficient, and if the amount is too large, there are adverse effects such as a decrease in chargeability and a decrease in sensitivity.
Preferably it is used at 1 to 20% by weight. The photosensitive layer has a thickness of 5 to 40 μm, preferably 15 to 30 μm. Also in this case, a known plasticizer for improving film formability, flexibility, mechanical strength, etc., an additive for suppressing residual potential, a dispersion auxiliary for improving dispersion stability, and coating. A leveling agent for improving the property, a surfactant, for example, a silicone oil, a fluorine-based oil, and other additives may be added.

An intermediate layer may be provided between the conductive support and the photosensitive layer. As the intermediate layer, for example, an anodized aluminum film, an inorganic layer such as aluminum oxide and aluminum hydroxide, polyvinyl alcohol, casein, polyvinylpyrrolidone, polyacrylic acid, cellulose
Organic layers such as, for example, polyurethanes, gelatin, starch, polyurethane, polyimide, and polyamide are used. In addition, these intermediate layers may contain conductive or semiconductive fine particles such as metals such as aluminum, copper, tin, zinc, and titanium, or metal oxides. The thickness of the intermediate layer is 0.1 to
It is 50 μm, preferably 0.5 to 20 μm. Further, if necessary, a protective layer may be provided to protect the surface of the photosensitive layer. For the surface protective layer, a thermoplastic resin or a light or thermosetting resin can be used.

(Examples) The present invention will be described more specifically below with reference to examples and the like, but the present invention is not limited to the following examples and the like as long as the gist is not exceeded. (Production Example 1) 40 g of o-phthalodinitrile, 18 g of titanium tetrachloride, and 500 ml of α-chloronaphthalene were reacted by heating and stirring at 200 to 250 ° C. for 3 hours in a nitrogen atmosphere.
After cooling to 100 to 130 ° C, the mixture is filtered while hot, and washed with 200 ml of α-chloronaphthalene heated to 100 ° C to obtain a crude product of dichlorotitanium phthalocyanine. This crude product was added at room temperature to α-chloronaphthalene 200 ml,
Then, after washing with 200 ml of methanol, washing with hot water is further performed for 1 hour in 500 ml of methanol. The crude product obtained after filtration was repeatedly heated and washed in 500 ml of water until the pH reached 6 to 7, and then dried to obtain oxotitanyl phthalocyanine crystals. The crystals were added to methyl ethyl ketone, milled together with glass beads having a diameter of 2 mm by a paint conditioner (manufactured by Red Level Co., Ltd.), washed with methanol, and dried to obtain the crystals of the present invention. This crystal showed an X-ray diffraction spectrum as shown in FIG.

The conditions for measuring the X-ray diffraction spectrum are as follows:
The measurement was performed under the following measurement conditions. X-ray source CuKα = 1.5418 ° Voltage 30-40 kV Current 50 mA Start angle 5.0 ° Stop angle 30.0 ° Step angle 0.01-0.02 ° Measurement time 2.0-0.5 ° / min. Measurement method θ / 2θ Scan method

Example 1 Titanium oxide (manufactured by Ishihara Sangyo Co., Ltd.)
71.6 parts by weight of TTO55A) and 107.4 parts by weight of copolymerized nylon (CM8000, manufactured by Toray Industries, Inc.) are added to a mixed solvent of 287 parts by weight of methyl alcohol and 533 parts by weight of 1,2-dichloroethane, and the mixture is treated with a paint shaker for 8 hours. Dispersion treatment was performed to prepare a coating liquid for an intermediate layer. This coating liquid is filled in a coating tank, and the conductive support has a diameter of 30 mm and a total length of 32.
A 6.3 mm aluminum drum-shaped support was dipped in a coating tank, pulled up, and naturally dried to form an intermediate layer having a thickness of 1 μm.

Next, 10 parts by weight of oxotitanyl phthalocyanine having the X-ray diffraction spectrum shown in FIG. 6 synthesized in Production Example 1 and 7.5 °, 9.1 °, 16.7 ° and 17.
X-type metal-free phthalocyanine having peaks at 3 ° and 22.3 ° (Fastogen Blue 8120BS, manufactured by Dainippon Ink) 5
Parts by weight, butyral resin (Sekisui Chemical: BL-1) 1
0 parts by weight are mixed with 980 parts by weight of methyl ethyl ketone,
The coating liquid for a charge generation layer obtained by dispersion treatment with a paint shaker was applied on the above-mentioned intermediate layer, and was naturally dried to form a charge generation layer having a thickness of 0.4 μm. Subsequently, a polycarbonate resin having a repeating unit represented by the following structural formula (7) (10 parts by weight of a styryl compound represented by the structural formula of the exemplified compound [Chemical Formula 8] (PCZ40 manufactured by Mitsubishi Gas Chemical Co., Ltd.)
0) 16 parts by weight were mixed to prepare a charge transport layer coating liquid having a solid content of 21% by weight using tetrahydrofuran as a solvent, applied on the charge generation layer, dried at 110 ° C. for 1 hour, and dried to a film thickness of 21 μm. A charge transport layer was formed.

[0029]

Embedded image

Next, the light attenuation characteristics of the produced electrophotographic photosensitive member were measured. The surface of the electrophotographic photosensitive member is charged to -600 ± 20 V with a scorotron charger using a drum sensitivity tester (manufactured by Gentec), and the light intensity of the semiconductor laser light (wavelength 780 nm) as an exposure light source is ND. The surface of the photoreceptor was adjusted with a filter, and the surface potential at each light intensity was measured. As shown in (Photoreceptor A) in FIG. 5, the light attenuation was small for weak exposure and completely attenuated for strong exposure.

Next, the resolution was examined. The produced electrophotographic photoreceptor was transferred to a commercial copying machine (AR-N200) for 120.
Equipped with a modified experimental machine that can output dots equivalent to 0 dpi, the computer creates data to write one dot on white solid black (data that scans the entire surface of the laser and turns off only one dot). Was transmitted via a printer interface, and the printed output image was observed. As a result, a white dot of one dot was clearly confirmed on the solid black. It has been found that the photoreceptor of the present invention can output a sufficiently high-resolution image.

Example 2 A sample was prepared in the same manner as in Example 1 except that the X-type metal-free phthalocyanine was changed to 1 part by weight, and an image was evaluated. (Example 3) A sample was prepared and the image was evaluated in the same manner as in Example 1 except that the X-type metal-free phthalocyanine was used in an amount of 7 parts by weight. (Example 4) A sample was prepared and the image was evaluated in the same manner as in Example 1 except that the charge transport material was changed to the exemplified compound [Chemical Formula 11].

Example 5 A sample was prepared in the same manner as in Example 1 except that the charge transporting substance was changed to the exemplified compound [Formula 15], and the image was evaluated. Example 6 A sample was prepared in the same manner as in Example 1 except that the charge transporting substance was changed to the exemplified compound [Chemical Formula 22], and the image was evaluated. Example 7 A sample was prepared in the same manner as in Example 1 except that the charge transporting substance was changed to the exemplified compound [Formula 36], and the image was evaluated.

Example 8 10 parts by weight of oxotitanyl phthalocyanine synthesized in Production Example 1 and X-type metal-free phthalocyanine (Fastogen Blue 8120BS: manufactured by Dainippon Ink) 5
Parts by weight was added to 185 parts by weight of tetrahydrofuran, and the mixture was dispersed with a paint shaker, and then the bisamine compound 100 represented by the structural formula of the above exemplified compound [Chemical Formula 14] was added.
Parts by weight, polycarbonate resin (Mitsubishi Gas Chemical Co., Ltd .: P
(CZ400) 160 parts by weight were mixed to prepare a coating solution having a solid content of 21% by weight using tetrahydrofuran as a solvent. This coating liquid is filled in a coating tank, and the diameter of the conductive support is 3
A drum-shaped support made of aluminum having a length of 0 mm and a total length of 326.3 mm was immersed in the coating tank, pulled up, and heated at 110 ° C. for 1 hour.
After drying for a period of time, a single-layer photoreceptor having a thickness of 20 μm was formed.

Next, one commercially available copying machine (AR-N200) was used.
The experimental machine was modified to output dots equivalent to 200 dpi, and was further modified to a positive charging process.
Data for writing dots (data for scanning the entire surface of the laser and turning off only one dot) was created, and the data was transmitted via a printer interface, and the printed output image was observed. As a result, 1
The white dots of the dots were clearly confirmed. It has been found that the photoreceptor of the present invention can output a sufficiently high-resolution image.

Comparative Example 1 A sample was prepared in the same manner as in Example 1 except that no X-type metal-free phthalocyanine was used, and the light attenuation characteristics and the image were evaluated.
As shown in FIG. 5 (comparative photoreceptor B), the light attenuation characteristic is large even with a weak exposure. When the image was examined, it was found that the output image was solid black and the dots were not formed properly despite the data for outputting the dots was sent.

Comparative Example 2 A sample was prepared in the same manner as in Example 1 except that the X-type metal-free phthalocyanine was 15 parts by weight as the charge generating substance, and the light attenuation characteristics and images were evaluated. As shown in FIG. 5 (comparative photoreceptor C), the light decay characteristics showed that the light decay was insufficient even with strong exposure and remained as a residual potential. When examining the image, the output image was able to distinguish dots, but the density of the solid black portion was low. Examples 1 to 8 above
Table 1 summarizes the evaluation results of Comparative Examples 1 and 2.

[0038]

[Table 1]

[0039]

As is clear from the above Examples and Comparative Examples, according to the first aspect of the present invention, it is possible to provide an electrophotographic photosensitive member having both high resolution and high sensitivity. According to the third aspect, it is possible to provide an electrophotographic photoreceptor capable of coping with a higher resolution process. According to the third aspect, it is possible to provide an electrophotographic photoreceptor having a higher sensitivity. According to the eighth aspect, a higher resolution electrophotographic photoreceptor having few image defects can be provided, and according to the ninth aspect, an electrophotographic photoreceptor capable of forming a better latent image can be provided. According to the tenth aspect, it is possible to provide an electrophotographic apparatus such as a copying machine, a printer, and a facsimile suitable for outputting digital data.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a laminated photoconductor including two layers, a charge generation layer and a charge transport layer.

FIG. 2 is a diagram illustrating a single-layer type photoconductor in which a photosensitive layer contains a charge generating substance and a charge transporting substance.

FIG. 3 is a diagram illustrating a laminated photoconductor including an intermediate layer, a charge generation layer, and a charge transport layer.

FIG. 4 is a view showing a photoconductor comprising an intermediate layer and a photosensitive layer.

FIG. 5 is a diagram showing light attenuation characteristics.

FIG. 6 is an X-ray diffraction spectrum of oxotitanyl phthalocyanine obtained in Production Example 1 of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 conductive support 2 charge generating material 3 charge transporting material 4, 4 ′ photosensitive layer 5 charge generating layer 6 charge transporting layer 7 intermediate layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03G 5/14 101 G03G 5/14 101 (72) Inventor Akihiko Kawahara 22nd Nagaikecho, Abeno-ku, Osaka-shi, Osaka No. 22 Inside Sharp Corporation (72) Inventor Satoshi Katayama 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Prefecture Inside Sharp Corporation (72) Tomomi Nakamura 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Sharp (72) Inventor Rikiya Matsuo 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka F-term (reference) 2H068 AA19 AA34 AA35 AA41 BA12 BA13 BA16 BA38 BA39 FA13 FB07

Claims (10)

[Claims] 1. An electrophotographic photoreceptor having a photosensitive layer on a conductive support, comprising a CuKα characteristic X-ray (wavelength: 1.54
In the X-ray diffraction spectrum with respect to 18 °), the overlapping peak bundle at 9.4 ° and 9.6 ° at the Bragg angle (2θ ± 0.2 °) is the maximum peak, and the peak at 27.2 ° is the second peak. A crystalline form of oxotitanyl phthalocyanine characterized by having a maximum peak of 2.
An electrophotographic photoreceptor comprising an X-type metal-free phthalocyanine having peaks at °, 9.1 °, 16.7 °, 17.3 ° and 22.3 ° in a photosensitive layer. 2. The electrophotographic photoconductor according to claim 1, wherein the content of the X-type metal-free phthalocyanine is 10 to 70% by weight of the oxotitanyl phthalocyanine. 3. A laminated electrophotographic photoreceptor having at least a charge generation layer and a charge transport layer, wherein the charge generation layer contains the crystalline oxotitanyl phthalocyanine and the X-type metal-free phthalocyanine according to claim 1 or 2. An electrophotographic photosensitive member characterized by the following. 4. The electrophotographic photoreceptor according to claim 1, comprising a styryl compound represented by the following general formula (1) as a charge transporting substance. Embedded image (In the general formula, Ar ₁ represents a substituted or unsubstituted arylene group; Ar ₂ and Ar ₃ represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group; Represents a group, a substituted or unsubstituted cyclic alkyl group, and in the case of two or more substituents, may form a ring with each other, and Ar ₂ and Ar ₃ may form a ring with Ar ₁ . Represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted cyclic alkyl group, and A and B are bonded to each other to form a ring May be used.) 5. The electrophotographic photoreceptor according to claim 1, further comprising a bisamine compound represented by the following general formula (2) as a charge transporting substance. Embedded image (Wherein R ₁₁ , R ₁₂ and R ₁₃ are a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group, and m, p,
q is an integer of 1 to 5. ) 6. The electrophotographic photoreceptor according to claim 1, comprising a bisamine compound represented by the following general formula (3) as a charge transporting substance. Embedded image (Wherein, Ar ₄ and Ar ₅ represent an aryl group, a heterocyclic group, an aralkyl group, or a heterocyclic-substituted alkyl group;
₁₄ and R ₁₅ are an alkyl group having 1 to 3 carbon atoms and 1 carbon atom
Represents an alkoxy group having 1 to 3 carbon atoms, a dialkylamino group having 1 to 3 carbon atoms, a halogen atom or a hydrogen atom, and r represents 1 to 4
S is an integer of 1 to 3. ) 7. The electrophotographic photoreceptor according to claim 1, comprising a butadiene compound represented by the following general formula (4) as a charge transporting substance. Embedded image (In the formula, R ₁₆ represents a dialkylamino group, and R ₁₇ represents a hydrogen atom or a dialkylamino group.) 8. The electrophotographic photosensitive member according to claim 1, wherein an intermediate layer is provided between the conductive support and the photosensitive layer. 9. An electrophotographic apparatus, wherein the electrophotographic photosensitive member according to claim 1 is image-exposed with a semiconductor laser. 10. An electrophotographic apparatus, wherein the electrophotographic photosensitive member according to claim 1 is charged, image-exposed, and then reverse-developed to obtain an image.