JPH115919A - Phthalocyanine crystal and electrophotographic photoreceptor using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the stability and dispersibility of crystals in a solvent and obtain excellent photosensitivity, by using phthalocyanine crystals whose infrared absorption spectrum exhibits a specified absorption and whose X-ray analysis spectrum exhibits specified peaks, or phthalocyanine crystals obtained by treating a non-crystalline titanylphthalocyanine compound with tetrahydrofuran. SOLUTION: The crystal comprises a compound represented by the formula, wherein X is a halogen atom; and n, m, l and k are each 0 to 4. The infrared spectrum of the compound exhibits strong peaks at 1332, 1074, 962 and 782±2 cm<-1> . The X-ray analysis spectrum thereof exhibits a maximum diffraction peak at a Bragg angle of 27.2 degree, strong diffraction peaks at 9.7 and 24.1 degrees, and characteristic peaks at 11.8, 13.4, 15.2, 18.2 and 18.7 degrees. It is desirable that the photosensitive layer of an electrophotographic photoreceptor contains the crystals serving as a charge generating substance. Examples of the compound include titanylphthalocyanine, titanylchlorophthalocyanine, and a mixture thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a titanyl phthalocyanine compound having a new crystal form and a high-sensitivity electrophotographic photosensitive member using the same.

[0002]

2. Description of the Related Art It has been known that phthalocyanines and metal phthalocyanines exhibit excellent photoconductivity, and some of them are used in electrophotographic photosensitive members. recent years,
With the development of non-impact printer technology, electrophotographic optical printers using laser light or LED as a light source and capable of achieving high image quality and high speed are becoming widespread, and photoconductors that can withstand those demands are being actively developed. .

[0003] In particular, when a laser is used as a light source, semiconductor lasers are often used from the viewpoints of small size, low cost, and simplicity. Limited to long wavelengths. Therefore, it is inappropriate to use a photoreceptor having sensitivity in the visible region, which has been conventionally used in an electrophotographic copying machine, for a semiconductor laser, and a photoreceptor having light-shielding sensitivity in the near infrared region is required. Is coming.

[0004] As organic materials satisfying this requirement, conventionally, methine squaric acid dyes, indoline dyes,
Cyanine dyes, pyrylium dyes, polyazo dyes,
Phthalocyanine dyes, naphthoquinone dyes, etc. are known. Methine squaric acid dyes, indoline dyes, cyanine dyes, and pyrylium dyes can be used for longer wavelengths but have practical stability (repeated properties). In short, it is difficult to increase the wavelength of a polyazo dye and it is disadvantageous in terms of production. Naphthoquinone dyes have difficulty in sensitivity at present.

On the other hand, phthalocyanine dyes are
It has a peak of spectral sensitivity in the long wavelength region of 00 nm or more, and has high sensitivity, and its spectral sensitivity changes depending on the central metal and the type of crystal form. R & D is being conducted.

Among the phthalocyanine compounds studied so far, compounds exhibiting high sensitivity in a long wavelength region of 780 nm or more include x-type metal-free phthalocyanine, c-type copper phthalocyanine, vanadyl phthalocyanine and the like.

On the other hand, in order to increase the sensitivity, a stacked photoreceptor using a phthalocyanine deposited film as a charge generation layer has been studied.
Among the phthalocyanines having a group IIIa or group IV metal as a central metal, some phthalocyanines having relatively high sensitivity have been obtained. As a reference concerning such a metal phthalocyanine, for example, Japanese Patent Application Laid-Open No. 57-111149
No. 57-148745, No. 59-36254,
Nos. 59-44054, 59-30541, 59
Nos. 31965 and 59-166959. However, the production of a vapor-deposited film requires a high-vacuum evacuation device, which increases the equipment cost, and thus the organic photoreceptor as described above must be expensive.

On the other hand, a composite type photoreceptor in which phthalocyanine is used not as a vapor-deposited film but as a resin dispersion layer, which is used as a charge generation layer, and a charge transfer layer is coated thereon has been studied. As a complex type photoreceptor, there are those using metal-free phthalocyanine (Japanese Patent Application No. 57-66963) and indium phthalocyanine (Japanese Patent Application No. 58-220493). These photoreceptors have relatively high sensitivity. Have the disadvantage that the sensitivity is rapidly reduced in a long wavelength region of 800 nm or more, and the latter is insufficient in sensitivity for practical use when the charge generation layer is made of a resin dispersion. Has disadvantages.

[0009]

In recent years, studies have been made on the use of titanyl phthalocyanine having electrophotographic characteristics with relatively high sensitivity (JP-A-59-495).
No. 44, No. 61-23928, No. 61-10
Nos. 9056 and 62-275272) are known to have different characteristics depending on various crystal forms. In order to produce these various crystal forms, special purification and special solvent treatment are required, and it is possible to produce materials having various physical properties due to differences in these production methods. The treatment solvent is different from that used when forming the dispersion coating film. This is because various types of crystals can easily grow in a growth treatment solvent, and when this solvent is used as a coating solvent, it is difficult to control the crystal form and particle size, and the paint is not stable. This is because the electrical characteristics are deteriorated and are not suitable for practical use. For this reason, a chlorine-based solvent such as chloroform, which hardly promotes crystal growth, is usually used when forming a coating. However, these solvents do not always have good dispersibility in titanyl phthalocyanine, and are problematic in terms of the dispersion stability of the paint.

[0010] That is, it is an object of the present invention to provide a titanyl phthalocyanine compound crystal having crystal stability, good dispersibility, and excellent photosensitivity in a solvent used for forming a coating.

[0011]

Means for Solving the Problems The present inventors have intensively studied the crystal transformation behavior of titanyl phthalocyanine which can improve the above-mentioned disadvantages and can be put to practical use as a more sensitive charge generator. The present inventors succeeded in developing a new crystal form having a good dispersibility and high photoelectric conversion efficiency, and reached the present invention.

That is, a novel x-ray diffraction pattern treated and crystallized with an amorphous titanyl phthalocyanine compound as a dispersion solvent, specifically, tetrahydrofuran, and an excellent photoconductive material exhibiting an infrared absorption spectrum. The present invention relates to a titanyl phthalocyanine compound having properties.

Hereinafter, the present invention will be described in detail.

The titanyl phthalocyanine used in the present invention has the general formula

[0015]

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(In the formula, X ₁ , X ₂ , X ₃ , and X ₄ each independently represent various halogen atoms, and n, m, l, and k each independently represent a number from 0 to _4. ) It is a compound represented by these.

Among the titanyl phthalocyanines used in the present invention, those suitable for characteristics are titanyl phthalocyanine (TiOPc), titanyl chlorophthalocyanine (T
iOPcCe) and mixtures thereof.

The titanyl phthalocyanine compound used in the present invention can be easily synthesized from 1,2-dicyanobenzene (p-phthalodinitrile) or a derivative thereof and a metal or a metal compound according to a known method.

For example, in the case of titanium oxyphthalocyanines, they can be easily synthesized according to the following reaction formula (1) or (2).

[0020]

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Examples of the organic solvent include nitrobenzene, quinoline, α-chloronaphthalene, β-chloronaphthalene,
High-boiling organic solvents inert to the reaction of α-methylnaphthalene, methoxynaphthalene, diphenyl ether, diphenylmethane, diphenylethane, ethylene glycol dialkyl ether, diethylene glycol dialkyl ether, triethylene glycol dialkyl ether, and the like are preferable, and the reaction temperature is usually 150 ° C. ~ 300 ° C, especially 2
00 ° C to 250 ° C is preferred.

In the present invention, the crude titanyl phthalocyanine compound thus obtained is treated with tetrahydrofuran after the non-crystallization treatment. At that time, suitable organic solvents, for example, methanol, ethanol, alcohols such as propyl alcohol, tetrahydrofuran,
After removing the organic solvent used for the condensation reaction using ethers such as 1,4-dioxane, it is preferable to perform a hot water treatment. In particular, it is preferable to wash until the pH of the washing solution after the hot water treatment becomes about 5 to 7.

Subsequently, 2-ethoxyethanol, diglyme, dioxane, tetrahydrofuran, N, N-
It is more preferable to treat with an electron-donating solvent such as dimethylformamide, N-methylpyrrolidone, pyridine, morpholine and the like.

The amorphous titanyl phthalocyanine compound can be obtained by a single chemical or mechanical method, but more preferably by a combination of various methods.

For example, non-crystalline particles can be obtained by weakening agglomeration between particles by a method such as an acid pasting method or an acid slurry method and then grinding by a mechanical treatment method. The equipment used at the time of grinding includes a kneader, a panbury mixer, an attritor, an edge runner mill, a roll mill, a ball mill, a sand mill, a SPEX mill, a homomixer, a disperser, an agitator, a jaw crusher, a stumble mill, a cutter mill, and a micro mill. There are, but are not limited to, such as a nightizer. The acid pasting method, which is well known as a chemical treatment method, is a method in which a pigment is dissolved in 95% or more of sulfuric acid or a sulfate is poured into water or ice water to reprecipitate. Is desirably kept at 5 ° C. or lower, and by slowly injecting sulfuric acid into water stirred at a high speed, amorphous particles can be obtained under even better conditions.

In addition, there are a method in which crystalline particles are directly ground by mechanical treatment for a very long time, a method in which particles obtained by an acid pasting method are treated with the above-mentioned solvent or the like and then ground.

Amorphous particles can also be obtained by sublimation. For example, it can be obtained by heating a titanyl phthalocyanine compound as a raw material obtained by various methods under vacuum to a temperature of 500 ° C. to 600 ° C. to sublimate it, and immediately depositing it on a substrate.

The amorphous titanyl phthalocyanine compound obtained as described above is treated in tetrahydrofuran to obtain new stable crystals. As a method for treating tetrahydrofuran, 5-300 parts by weight of tetrahydrofuran is added to 1 part by weight of the amorphous titanyl phthalocyanine compound in various stirring tanks, and the mixture is stirred. The temperature can be either heating or cooling. However, the heating speeds up the crystal growth, and lowers the temperature at a low temperature. The stirring tank is used for dispersion in addition to the ordinary stirrer. Ultrasonic, ball mill,
A sand mill, a homomixer, a disperser, an agitator, a micronizer, and the like, and a mixer such as a concal blender V-type mixer are appropriately used, but are not limited thereto. After these stirring steps, filtration, washing and drying are usually performed to obtain stabilized titanyl phthalocyanine crystals. At this time, a resin or the like can be added to the dispersion as needed without filtering and drying to form a coating material. When used as a coating film of an electrophotographic photoreceptor or the like, it is very effective because it saves steps.

FIG. 4 shows the infrared absorption spectrum of the titanyl phthalocyanine of the present invention thus obtained. This titanyl phthalocyanine has an absorption wave number (cm ⁻¹ , but including an error of ± 2) of 1332, 107.
4, 962 and 783 show characteristic strong peaks. Further, 729, 752, 895, 1059, 1120, 12
88, 1490, etc.
2 and 3 show X-ray diffraction diagrams of the titanyl phthalocyanine using Cu-Kα. This titanyl phthalocyanine has a Bragg angle of 2θ (including an error range of ± 0.2) in the X-ray diffraction diagram of 27.
It has the largest peak at 2 degrees and relatively strong peaks at 9.7 degrees and 24.1 degrees. Further 11.8 degrees, 13.4
, 15.2, 18.2, and 18.7 degrees. X-ray diffraction pattern (FIG. 7) and infrared absorption spectrum (FIG. 6) of titanyl phthalocyanine treated with N-methylpyrrolidone and acid paste method [Mophthal & Thomas, "Phthalocyanine compound" (issued in 1963)
X-ray diffraction diagram (FIG. 8) and infrared absorption spectrum (FIG. 5) of titanyl phthalocyanine treated according to the above-mentioned “Method for obtaining α-form phthalocyanine”. From these X-ray diffraction patterns, it can be seen that titanyl phthalocyanine obtained by the above method is novel.

The other titanyl phthalocyanine compounds used in the present invention have the same four strong specific peaks in their infrared absorption spectra irrespective of the difference of the halogen atom or its substitution position or its substitution number. Is recognized.
The X-ray diffraction pattern also shows three common strong specific peaks.

The titanyl phthalocyanine of the present invention does not show a significant change in the X-ray diffraction pattern and infrared absorption spectrum even when the crystal growth is promoted by further heating and stirring in tetrahydrofuran, and the transition to another crystal form is performed. It is a very stable and good crystal without defects.

The photoreceptor is preferably formed by laminating an undercoat layer, a charge generation layer, and a charge transfer layer on a conductive substrate in this order, but is preferably formed by laminating an undercoat layer, a charge transfer layer, and a charge generation layer in this order. Alternatively, the undercoat layer may be formed by dispersing and coating a charge generating agent and a charge transfer agent with an appropriate resin. Further, these undercoat layers can be omitted as necessary. By coating a suitable binder on a substrate using the titanyl-based phthalocyanine compound according to the present invention as a charge generating agent, a charge generating layer having extremely good dispersibility and extremely high photoelectric conversion efficiency can be obtained.

The coating is performed by a spin coater, an applicator, a spray coater, a bar coater, a dipping coater,
The drying is carried out using a doctor blade, a roller coater, a curtain coater, or a bead coater, and drying is preferably carried out by heating and drying at 40 to 200 ° C. for 10 minutes to 6 hours under static or blowing conditions. The film thickness after drying is 0.01
To 5 microns, preferably 0.1 to 1 micron.

The binder used when forming the charge generation layer by coating can be selected from a wide range of insulating resins, and is selected from organic photoconductive polymers such as poly-N-vinylcarbazole, polyvinylanthracene and polyvinylpyrene. it can. Preferably, polyvinyl butyral, polyarylate (such as a condensation polymer of bisphenol A and phthalic acid), polycarbonate, polyester, phenoxy resin, polyvinyl acetate, acrylic resin, polyacrylamide resin, polyamide, polyvinyl pyridine,
Cellulose resin, urethane resin, epoxy resin, silicone resin, polystyrene, polyketone, polyvinyl chloride, polyvinyl chloride copolymer, polyvinyl acetal, polyacrylonitrile, phenol resin, melamine resin, casein, polyvinyl alcohol, polyvinyl pyrrolidone, etc. An insulating resin can be used. The amount of the resin contained in the charge generation layer is 100% by weight or less, preferably 40% by weight or less. These resins may be used alone or in combination of two or more. The solvent for dissolving these resins differs depending on the type of the resin, and it is preferable to select a charge generation layer or an undercoat layer described later from those that do not affect the coating. Specifically, aromatic hydrocarbons such as benzene, xylene, ligroin, monochlorobenzene, and dichlorobenzene; ketones such as acetone, methyl ethyl ketone and cyclohexanone; alcohols such as methanol, ethanol, and isopropanol; ethyl acetate; methyl cellosolve; Esters, aliphatic halogenated hydrocarbons such as carbon tetrachloride, chloroform, dichloromethane, dichloroethane, and trichloroethylene; ethers such as tetrahydrofuran, dioxane, ethylene glycol mono, and methyl ether; N, N-dimethylformamide; Amides such as N-dimethylacetamide and sulfoxides such as dimethylsulfoxide are used.

The charge transfer layer is formed by dissolving and dispersing the charge transfer agent alone or in a binder resin. Any known charge transfer material can be used. The charge transfer material includes an electron transfer material and a hole transfer material. Examples of the electron transfer material include chloranil, bromoanil, tetracyanoethylene, tetracyanoquinodimethane, 2,4,7.
-Trinitro-9-fluorenone, 2,4,5,7-tetranitro-9-fluorenone, 2,4,7-trinitro-9-dicyanomethylenefluorenone, 2,4,5
There are electron withdrawing substances such as 7-tetranitroxanthone and 2,4,8-trinitrothioxanthone, and those obtained by polymerizing these electron withdrawing substances.

As the hole transfer material, pyrene, N-ethylcarbazole, N-isopropylcarbazole, N-
Methyl-N-phenylhydrazino-3-methylidene-9
-Ethylcarbazole, N, N-diphenylhydrazino-3-methylidene-9-ethylcarbazole, N, N-
Diphenylhydrazino-3-ethylidene-10-ethylphenothiazine, N, N-diphenylhydrazino-3
-Methylidene-10-ethylphenoxazine, P-diethylaminobenzaldehyde-N, N-diphenylhydrazone, P-diethylaminobenzaldehyde-N-α
-Naphthyl-N-phenylhydrazone, P-pyrrolidinobenzaldehyde-N, N-diphenylhydrazone,
-Methyl-4-dibenzylamino, benzaldehyde-
1'-ethyl-1'-benzothiazolylhydrazone, 2
-Methyl-4-dibenzylaminobenzaldehyde-
1′-propyl-1′-benzothiazolylhydrazone,
2-methyl-4-dibenzylaminobenzaldehyde-
1 ′, 1′-diphenylhydrazone, 9-ethylcarbazole-3-carboxaldehyde-1′-methyl-1 ′
-Phenylhydrazone, 1-benzyl-1,2,3,4
-Tetrahydroquinoline-6-carboxaldehyde-
1 ′, 1′-diphenylhydrazone, 1,3,3-trimethylindolenine-ω-aldehyde-N, N-diphenylhydrazone, P-diethylbenzaldehyde-3-
Hydrazones such as methylbenzthiazolinone-2-hydrazone, 2,5-bis (P-diethylaminophenyl)
-1,3,4-oxadiazole, 1-phenyl-3-
(P-diethylaminostyryl) -5- (P-diethylaminophenyl) pyrazoline, 1- (quinolyl (2))
-3- (P-diethylaminostyryl) -5- (P-diethylaminophenyl) pyrazolin, 1- (pyridine (2))-3- (P-diethylaminostyryl) -5-
(P-diethylaminophenyl) pyrazolin, 1- (6
-Methoxy-pyridyl (2))-3- (P-diethylaminostyryl) -5- (P-diethylaminophenyl)
Pyrazoline, 1- (pyridyl (3))-3- (P-diethylaminostyryl) -5- (P-diethylaminosphenyl) pyrazolin, 1- (repidyl (2))-3-
(P-diethylaminostyryl) -5- (P-diethylaminophenyl) pyrazolin, 1- (pyridyl (2))
-3- (P-diethylaminostyryl) -4-methyl-
5- (P-diethylaminophenyl) pyrazolin, 1-
(Pyridyl (2))-3- (α-methyl-P-diethylaminostyryl) -5- (P-diethylaminophenyl) pyrazolin, 1-phenyl-3- (P-diethylaminostyryl) -4-methyl-5- ( Pyrazolines such as P-diethylaminophenyl) pyrazolin, 1-phenyl-3- (α-benzyl-P-diethylaminostyryl) -5- (P-diethylaminophenyl) -6-pyrazoline and spiropyrazoline, 2- (P-diethylaminostyryl) ) -6-diethylaminobenzoxazole,
Oxazole compounds such as 2- (P-diethylaminophenyl) -4- (P-diethylaminophenyl) -5- (2-chlorophenyl) oxazole and 2- (P-diethylaminostyryl) -6-diethylaminobenzothisol A thiazole compound, a triarylmethane compound such as bis (4-diethylamino-2-methylphenyl 0-phenylmethane), 1,1-bis (4-N, N-diethylamino-2-methylphenyl) heptane, 1,
2,2-tetrakis (4-N, N-dimethylamino-2
Polyarylalkanes such as -methylphenyl) ethane; stilbene compounds such as 1,1-diphenyl-P-diphenylaminoethylene; triarylamino compounds such as 4,4'-3 methylphenylphenylaminobiphenyl; N-vinylcarbazole, polyvinylpyrene, polyvinylanthracene, polyvinylacridine, poly-9-vinylphenylanthracene, pyrene-
Examples include formaldehyde resins, ethylcarbazole formaldehyde resins, and polysilylene resins such as polymethylphenylsilylene.

In addition to these organic charge transfer materials, inorganic materials such as selenium, selenium-tellurium amorphous silicon, and cadmium sulfide can also be used.

These charge transfer materials can be used alone or in combination of two or more. The resin used for the charge transfer layer is silicon resin, ketone resin, polymethyl methacrylate, polyvinyl chloride, acrylic resin polyarylate, polyester, polycarbonate, polystyrene, acrylonitrile, styrene copolymer, acrylonitrile-butadiene copolymer, polyvinyl butyral, polyvinyl formal, Insulating resins such as polysulfone, polyacrylamide, polyamide, and chlorinated rubber, poly-N-vinylcarbazole, polyvinylanthracene, and polyvinylpyrene are used.

It is effective to appropriately add various additives usually used for these resins, for example, an ultraviolet absorber and an antioxidant, for preventing deterioration.

The coating method is performed using a spin coater, applicator, spray coater, bar coater, immersion coater, doctor blade, roller coater, curtain coater, bead coater, or the like. Desirably, the material is coated so as to have a thickness of 10 to 20 microns. In addition to these layers, an undercoat layer can be provided on the conductive substrate for the purpose of preventing a decrease in chargeability and improving adhesiveness. Nylon 6, Nylon 6 as undercoat layer
6, nylon 11, nylon 610, copolymer nylon,
Alcohol-soluble polyamides such as alkoxymethylated nylon, casein, polyvinyl alcohol, nitrocellulose, ethylene-acrylic acid copolymer, gelatin, polyurethane, polyvinyl butyral, and metal oxides such as magnetized aluminum are used. It is also effective to include conductive particles such as metal oxide and carbon black in the resin.

Further, as shown in the spectral sensitivity characteristic diagram of FIG. 1, the material of the present invention has an absorption peak at a wavelength near 800 mm, and is used not only for electrophotographic photoreceptors in copiers and printers, but also for solar cells, It is also suitable as a photoelectric conversion element and an absorbing material for optical disks.

[0042]

Embodiments of the present invention will be described below. Parts in the examples mean parts by weight.

(Example 1) o-phthalodinitrile 20.
4 parts and 7.6 parts of titanium tetrachloride in 50 parts of quinoline
After heating at 00 ° C. for 2 hours, the solvent was removed by steam distillation, and the mixture was purified with a 2% aqueous chloride solution and subsequently with a 2% aqueous sodium hydroxide solution, washed with methanol and N, N-dimethylformamide, dried, and dried. 21.3 parts of titanium phthalocyanine (TiOPc) were obtained. 2 parts of this titanyl phthalocyanine are dissolved little by little in 40 parts of 98% sulfuric acid at 5 ° C., and the mixture is stirred for about 1 hour while maintaining the temperature at 5 ° C. or less. Subsequently, the sulfuric acid solution was stirred at a high speed of 400.
The mixture was slowly poured into a portion of ice water, and the precipitated crystals were filtered. The crystals are washed with distilled water until no acid remains,
Get a wet cake. The cake (assuming that the amount of phthalocyanine contained is 2 parts) is stirred in 100 parts of THF for about 5 hours, filtered, washed with THF, dried, and then dried.
7 parts of titanyl phthalocyanine were obtained. The infrared absorption spectrum of the product thus obtained was a new one as shown in FIG. The X-ray diffraction pattern was as shown in FIG.

The mass and elemental analysis of this substance confirmed that it was oxytitanium phthalocyanine. 0.4 g of titanium oxyphthalocyanine thus obtained, 0.3 g of polyvinyl butyral
g and 30 g of THF with a sand mill. This dispersion was applied on a polyester film having an aluminum vapor-deposited layer with a dry thickness of 0.2 μm using a film applicator.
And dried at 100 ° C. for 1 hour to obtain a charge generation layer. Diethylaminobenzaldehyde-N, N is used as a charge transfer agent on the charge generation layer thus obtained.
-100 parts of diphenylhydrazone and 100 parts of a polycarbonate resin (Mitsubishi Gas Chemical Z-200) toluene /
A solution dissolved in 500 parts of THF (1/1) was applied to a dry film thickness of 15 μm to form a charge transfer layer.

Thus, an electrophotographic photosensitive member having a laminated photosensitive layer was obtained. The half-life exposure amount (E1 /
2) The electrostatic copying machine test equipment (Kawaguchi Electric Works EPA-8)
100). That is, it was charged by a corona discharge of -5.5 KV in a dark place, and then exposed to white light having an illuminance of 51 ux, and an exposure amount E1 / 2 (eux.sec) required to attenuate to half the surface potential was obtained.

Example 2a 4-dibenzylamino-2-methylbenzaldehyde, 1,1'-
Electrophotographic characteristics were measured in the same manner as in Example 1 except that diphenylhydrazone was used.

Example 2b Electrophotographic characteristics were measured in the same manner as in Example 1 except that 2 parts of 2-hydroxy-4-methokinebenzophenone was further added to Example 2a.

Example 3 Evaluation was made in the same manner as in Example 1 except that 1-phenyl-1,2,3,4 tetrahydroquinoline 6-carboxaldehyde 1,1'diphenylhydrazone was used as the charge transfer material.

Example 4 The wet cake after the sulfuric acid treatment in Example 1 was washed with 5% hydrochloric acid, washed with filtered water until neutral, and dried. 0.4 part of the obtained titanyl furocyanine was placed in a ball mill together with 30 parts of THF and dispersed for 10 hours. A part was taken out and an X-ray diffraction image was examined. The result showed a crystal form as shown in FIG. Next, 0.3 part of a polyester resin was added to the ball mill and dispersion was continued for 8 hours to obtain a coating material. This dispersion was applied onto an aluminum plate coated with a 0.3 μm polyamide resin so that the simple film thickness became 0.3 μm to obtain a charge generation layer. A photoreceptor was prepared and measured in the same manner as in Example 1 except that 1,1P dimethylaminobenz-4,4-diphenyl-2-butylene was used as a charge transfer agent thereon.

Example 4b 4 parts of 2,4-bis-n- (octylthio) -6- (4-hydroxy-3,5-di-tert-butylanilino) -1,3,5-triazine were further added to Example 4. A photoconductor was prepared and measured in the same manner as in Example 1 except for the above.

Example 5 A charge transfer layer was obtained by dissolving 50 parts of purified polymethylphenylsilylene obtained in the same manner as in Example 1 in 100 parts of toluene and applying it to a dry film thickness of 12 μm. Was formed. Thereafter, the electrophotographic characteristics were measured in the same manner as in Example 1.

Example 6 One part of titanyl phthalocyanine obtained in Example 1, 0.7 part of P-diethylaminobenzaldehyde-1,1 diphenylhydrazone and a polyester resin (manufactured by Byron 200 Toyobo) were mixed with tetrahydrofuran and toluene (1 part). / 1) After dispersing 42 parts of the solution dissolved in the mixed solution together with glass beads in a glass container by a paint conditioner, the dispersion was applied on an aluminum plate so as to have a dry film thickness of 12 μm, and a single-layer type electrophotographic photoreceptor was obtained. Created. Example 1 except that the charging applied voltage was set to +5.5 KV.
The characteristics were evaluated in the same manner as in the above.

(Comparative Examples 1 and 2) The oxytitanium phthalocyanine obtained in Example 1 before the sulfuric acid treatment was washed with N-methylpyrrolidone and subjected to infrared absorption spectrum.
Was obtained (Comparative Example 1). FIG. 7 shows the X-ray spectrum of this crystal.

The infrared absorption spectrum of the amorphous phthalocyanine obtained immediately after the sulfuric acid treatment was as shown in FIG. 5 (Comparative Example 2). FIG. 8 shows the X-ray spectrum of this crystal.

A photoreceptor was prepared and evaluated in the same manner as in Example 1 except that the dispersion solvent was changed to a mixture of dichloromethane and trichloroethane (1/1).

[0056]

[Table 1]

[0057]

As described above, the material of the present invention is a novel stable crystal and is stable to a solvent. Therefore, when a coating material is used as a coating material, the solvent can be easily selected, the dispersion is good, and the life is long. Since a long paint can be obtained, uniform film formation, which is important in photoconductor production, is facilitated. The obtained electrophotographic photoreceptor has high photosensitivity particularly to a semiconductor laser wavelength region, and is particularly effective as a high-speed and high-quality printer photoreceptor.

[Brief description of the drawings]

FIG. 1 is a spectral sensitivity characteristic diagram of a photoreceptor of the present invention obtained by an example.

FIG. 2 is an X-ray diffraction diagram of the titanyl phthalocyanine compound according to the present invention.

FIG. 3 is an X-ray diffraction diagram of the titanyl phthalocyanine compound according to the present invention.

FIG. 4 is an infrared absorption spectrum of the titanyl phthalocyanine compound according to the present invention.

FIG. 5 is an infrared absorption spectrum of a known titanyl phthalocyanine obtained in Comparative Example 2.

FIG. 6 is an infrared absorption spectrum of a known titanyl phthalocyanine obtained in Comparative Example 1.

FIG. 7 is an X-ray diffraction diagram of a known titanyl phthalocyanine obtained in Comparative Example 1.

FIG. 8 is an X-ray diffraction diagram of a known titanyl phthalocyanine obtained in Comparative Example 2.

Claims (5)

[Claims] (1) In an infrared absorption spectrum, 1332 ±
2 cm ⁻¹ , 1074 ± 2 cm ⁻¹ , 962 ± 2 cm ⁻¹ , 7
Shows a characteristic strong absorption peak at 83 ± 2 cm ^-1. (Wherein X ₁ , X ₂ , X ₃ , and X ₄ each independently represent various halogen atoms, and n, m, l, and k each independently represent 0 to 0.
Represents the number 4. A phthalocyanine crystal represented by). 2. In the infrared absorption spectrum, an additional 72
9 ± 2 cm ⁻¹ , 752 ± 2 cm ⁻¹ , 895 ± 2 cm ⁻¹ ,
1059 ± 2 cm ⁻¹ , 1120 ± 2 cm ⁻¹ , 1288 ±
2. The phthalocyanine crystal according to claim 1, wherein the phthalocyanine crystal has a strong absorption at 2 cm ^-1 and 1490 ± 2 cm ^-1 . 3. An X-ray diffraction spectrum using CuKα as a radiation source shows a maximum diffraction peak at a Bragg angle (2θ ± 0.2 degrees) of 27.2 degrees and is strong at 9.7 degrees and 24.1 degrees. Showing diffraction peaks and 11.8 degrees, 13.4 degrees, 1
3. The phthalocyanine crystal according to claim 1, wherein the phthalocyanine crystal exhibits characteristic peaks at 5.2 degrees, 18.2 degrees, and 18.7 degrees. 4. An infrared absorption spectrum obtained by treating an amorphous titanyl phthalocyanine compound with tetrahydrofuran at 1332 ± 2 cm ⁻¹ ,
1074 ± 2 cm ⁻¹ , 962 ± 2 cm ⁻¹ , 783 ± 2c
8. It shows a characteristic strong absorption peak at m ^-1 and a maximum diffraction peak at a Bragg angle (2θ ± 0.2 degrees) of 27.2 degrees in an X-ray diffraction spectrum using CuKα as a source. It shows strong diffraction peaks at 7 degrees, 24.1 degrees, and 11.8 degrees, 13.4 degrees, 15.2 degrees, 18.2 degrees,
A phthalocyanine crystal showing a characteristic peak at 18.7 degrees. 5. An electrophotographic photosensitive member having a conductive layer and a photosensitive layer, wherein the photosensitive layer has a charge generating substance and a charge transfer substance, and the charge generating substance is used as the charge generating substance. An electrophotographic photosensitive member comprising the titanyl phthalocyanine compound according to claim 3 or 4.