JPH07306537A - Electrophotographic photoreceptor for transferring latent image - Google Patents

Abstract

PURPOSE:To obtain an electrophotographic photoreceptor for transferring the latent image excellent if electrification ability and sensitivity and capable of ensuring high latent image transfer potential by forming a photosensitive layer contg. copper phthalocyanine and an org. positive hole transferring material dispersed in a binder. CONSTITUTION:A single org. photosensitive layer contg. at least particle-shaped copper phthalocyanine represented by formula I and an org. positive hole transferring material dispersed in a binder is formed on an electrical conductive substrate. A compd. represented by formula II is preferably used as the positive hole transferring material. In the formula II, each of Ar1-Ar3 is nonsubstituted or substituted aryl by alkyl, alkoxy, etc., or a heterocyclic group. The copper phthalocyanine accounts for 0.1-40wt.%, preferably 0.3-25wt.% of the total amt. of the photosensitive layer. The org. positive hole transferring material accounts for 10-80wt.%, preferably 20-50wt.% of the total amt. of the photosensitive layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a latent image transfer system, and is particularly suitable for a latent image transfer system for high definition image output. It is about.

[0002]

2. Description of the Related Art Many photoconductor systems and constituent materials are known as photoconductors used in the Carlson process, which is one of the electrophotographic processes. In order to achieve the desired quality requirements, the so-called function separation method, in which the functions of the photoconductor are separated and the functions are shared by several layers with different compositions and components, has become the main method of current photoconductors. ing. With this method, the charging property, sensitivity, mechanical strength, and repeatability of these properties and usability have been sufficiently satisfied for practical use. The background is the development of many materials. In particular, many kinds of organic materials have been filed because of their wide variety of materials and their excellent electrical insulation. As the charge generating substance, for example, for phthalocyanine, as X-type metal-free phthalocyanine in JP-B-49-4338, π-type metal-free phthalocyanine in JP-A-48-724, and JP-A-58-182639. The publication discloses τ-type metal-free phthalocyanine, and JP-A-51-23738 discloses ε-type copper phthalocyanine. JP-A-59-4954.
No. 4 discloses a titanyl phthalocyanine crystal.
No. 239,248 discloses α-type titanyl phthalocyanine, and JP-A No. 62-67094 discloses β-type titanyl phthalocyanine and a disazo pigment.
7543, 52-4241, 53-95033, 54-
No. 727 is disclosed.

As a hole-transporting substance, JP-A-52-124
No. 330, 52-139064, oxadiazole compounds, JP-A-55-46760, 55-
Hydrazone compounds in Japanese Patent No. 46761 and Japanese Patent Application Laid-Open No. 56-1
19132, a benzidine-based diamine compound, JP-A-58-65440, and JP-A-58-198043, a styryltriarylamine compound, JP-A 3-1.
No. 07860 discloses a butadiene-based compound. In addition to the function-separated layered structure well known as the structure of a photoreceptor, in JP-A-54-1633, a single layer in which a charge-generating pigment is dispersed in a resin together with a donor and an acceptor which are charge-transporting substances. Further, Japanese Patent Laid-Open No. 3-256050 proposes a single-layer photoconductor having the same structure as described above using a diphenoquinone derivative as an acceptor.

On the other hand, the latent image transfer method, which is one of the electrophotographic methods, differs from the above-mentioned Carlson method in that a voltage is applied between the photoconductor and an electrostatic recording material capable of holding an electrostatic latent image. In this way, the electrostatic latent image formed on the photoconductor is transferred onto the electrostatic recording body, and then the transferred electrostatic latent image is developed and visualized. This method has been known for a long time. M. Schafert's "Electronic Photography" (Kyoritsu Publishing, 1973), TESI (Latent Image Transfer) on page 70
There is a description of the law. According to it, in the latent image transfer method, a sequential method in which an electrostatic latent image is first formed on a photoconductor and then the electrostatic image is transferred to the electrostatic recording body, and an electrostatic recording body and a photoconductor are used. There is a direct method of making electrostatic production in contact. The latent image transfer method has the disadvantage that plain paper cannot be used because it requires a conductive layer and a dielectric layer as a recording medium, compared to the Carlson method.
Since it is not necessary to directly develop the electrostatic latent image on the photoconductor, there is a merit that there is a high margin in the device design in which various units required for the electrophotographic process are arranged around the electrophotographic photoconductor. Taking advantage of such merits, a copying machine employing a sequential latent image transfer method was commercially available in the early days of the electrophotographic apparatus. As an electrophotographic photoreceptor used in such a copying machine, there is a laminated photoreceptor in which a vapor-deposited Se layer is used as a charge generation layer and polyvinylcarbazole is used as a charge transport layer. However, the photoconductor applicable to a copying machine using such a sequential transfer system does not need to have special characteristics, and the electrophotographic photoconductor for the Carlson method is directly used in the latent image transfer process of the sequential transfer system. It can be used as a photoconductor for use.

On the other hand, in the simultaneous transfer system, since the device for the photosensitive member is required to be more effective than the sequential transfer, for example, Japanese Patent Application Laid-Open No. 56-43665 filed an application for providing an insulating property in response to a demand for high breakdown voltage. ing. However, recently, instead of competing with the Carlson method within the application range of the Carlson method, a review of the latent image transfer method for high-quality electrophotographic image output, which is difficult with the Carlson method, is being considered. . This is because the sequential transfer method does not require a transfer step after development and thus has a possibility of originally obtaining a high-definition and high-quality image as compared with the Carlson method. As a photoreceptor for a latent image transfer system used in such a high-quality image output device, it is important to have high sensitivity and stability of potential by repetition, but especially one that can achieve high transfer potential is used. There is a need to. If the transfer potential is low, the density of the output image will be low. To increase the transfer potential, a transfer voltage may be applied so as to increase the difference between the potential of the photoconductor and the potential of the recording material conductive layer during the transfer of the latent image.
If the transfer voltage is set too high, there arises a problem that an abnormal image such as a missing image occurs. Further, if the dielectric layer of the recording material is thickened, the electric potential of the recording material is improved, but even in this case, the transferred charge amount does not increase. It is understood that in a system in which the process speed is slowed down to improve the image quality, the development density is mainly determined by the surface charge amount of the recording material, and thus such a measure cannot increase the image density. Considering the above problems, the high-quality latent image transfer process is
It is understood that there is a demand for an electrophotographic photosensitive member that can secure a high transfer potential of the electrostatic recording material. However, it has been unclear whether a high transfer potential can be obtained immediately when a conventionally used electrophotographic photoreceptor is used in a latent image transfer process. In fact, when the multi-layer type photoconductor was applied to the process, the transfer potential was rather low.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electrophotographic photosensitive member for transferring a latent image, which is excellent in charging property and sensitivity and has a high latent image transfer potential.

[0007]

According to the present invention, firstly, after forming an electrostatic latent image on an electrophotographic photosensitive member, an electrostatic recording member is brought into contact with the surface side of the photosensitive member, A voltage is applied between the photoconductor and the electrostatic recording medium to transfer the electrostatic latent image corresponding to the photoconductor onto the electrostatic recording medium, and thereafter, the electrostatic latent image on the electrostatic recording medium is transferred. An electrophotographic photosensitive member used in an electrophotographic method of a latent image transfer system for visualization, in which a single organic photosensitive layer is provided on a conductive substrate directly or through an undercoat layer, and the photosensitive layer is at least particulate. There is provided an electrophotographic photoreceptor for transferring a latent image, in which copper phthalocyanine represented by the following formula (I) and an organic hole transporting substance are dispersed in a binder.

[Chemical 1] Further, according to the present invention, secondly, in the electrophotographic photosensitive member for latent image transfer described in the above first, in the binder of the photosensitive layer,
Further provided is an electrophotographic photoreceptor for transferring a latent image in which an organic acceptor compound substance is dispersed, and thirdly, in the electrophotographic photoreceptor for transferring a latent image described in the above second, an organic acceptor compound and an organic hole are provided. Weight composition ratio of transport material is 1 /
An electrophotographic photoreceptor for transferring a latent image in the range of 50 to 5/1 is provided. Fourthly, in the electrophotographic photoreceptor for transferring a latent image described in the above first to third, the organic hole transporting substance is at least one compound selected from the following general formulas (II) to (VIII). An electrophotographic photoreceptor for image transfer is provided.

[Chemical 2] (In the formula, Ar₁, Ar₂And Ar₃Is an unsubstituted
Or alkyl group, alkoxy group, thioalkoxy group,
Reeloxy group, halogen atom, cyano group, nitro group
Or an aryl group or heterocyclic group substituted with an amino group
Represent )

[Chemical 3] (In the formula, R ₁ and R ₂ represent a hydrogen atom, an alkyl group or an aryl group, and may form a ring between R ₁ and R _2. Ar ₁ represents an arylene group or a heterocyclic group. , Ar ₂ and Ar ₃ represent an alkyl group, an aryl group or a heterocyclic group.)

[Chemical 4] (In the formula, Ar₁, Ar₂And Ar₃Is an unsubstituted
Or alkyl group, alkoxy group, halogen atom, cyano
Aryl groups substituted with groups, nitro groups or amino groups
Or represents a heterocyclic group. )

[Chemical 5] (In the formula, Ar ₁ , Ar ₂ , Ar ₅ and Ar ₆ represent an aryl group which is unsubstituted or substituted by an alkyl group, an alkoxy group, a halogen atom, a cyano group, a nitro group or an amino group, Ar ₃ and Ar ₄ represents an arylene group which is unsubstituted or substituted with the above substituents.)

[Chemical 6] (In the formula, Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ represent an aryl group which is unsubstituted or substituted by an alkyl group, an alkoxy group, a halogen atom, a cyano group, a nitro group or an amino group, and X is an alkylene group. Group, sulfur, oxygen or (C
H = CH) n. n represents an integer of 1 or more. )

[Chemical 7] (In the formula, Ar₁Is an unsubstituted or alkyl group,
Lucoxy group, halogen atom, cyano group, nitro group
Is an aryl group or heterocyclic group substituted with an amino group,
r₂And Ar₃Is an alkyl group, phenyl group or naphthyl group
Represents )

[Chemical 8] (In the formula, Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ represent an aryl group or a heterocyclic group which is unsubstituted or substituted with an alkyl group, an alkoxy group, a halogen atom or an amino group. Represents an integer of 0 or 1.)

The present invention will be described in more detail below. The role of the organic acceptor compound in the single-layer type photoconductor of the present invention is to lower the residual potential and to prolong the life of electrostatic properties of the photoconductor. The reason why these properties are improved by the organic acceptor compound is not clear, but one of them is to prevent the reduction of the internal electric field of the pigment by pulling out the electrons out of the holes and electrons generated in the pigment by light irradiation. Therefore, it is possible to prevent a decrease in electrical resistance.

The copper phthalocyanine used in the present invention has a sensitivity particularly in the range of 600 to 800 nm and is suitable for a high-definition image forming system using an LED array or a semiconductor laser. As the crystal type, α type, β type and ε type can be used, and β type and ε type are particularly preferable from the viewpoint of crystal stability. The amount of copper phthalocyanine used in the present invention in the entire photosensitive layer is 0.1 to 40% by weight, preferably 0.3 to 25% by weight.

As the organic hole transporting material used in the present invention, at least one compound selected from the above general formulas (II) to (VIII) is used. The amount of the organic hole transport material in the entire photosensitive layer is 10 to 80% by weight, preferably 20.
~ 50% by weight. Hereinafter, specific examples of the hole transport material will be shown.

[0011]

[Table 1- (1)]

[0012]

[Table 1- (2)]

[0013]

[Table 1- (3)]

[0014]

[Table 2- (1)]

[0015]

[Table 2- (2)]

[0016]

[Table 2- (3)]

[0017]

[Table 3- (1)]

[0018]

[Table 3- (2)]

[0019]

[Table 4- (1)]

[0020]

[Table 4- (2)]

[0021]

[Table 5- (1)]

[0022]

[Table 5- (2)]

[0023]

[Table 5- (3)]

[0024]

[Table 6- (1)]

[0025]

[Table 6- (2)]

[0026]

[Table 6- (3)]

[0027]

[Table 6- (4)]

[0028]

[Table 6- (5)]

[0029]

[Table 7- (1)]

The present invention will now be described in more detail with reference to the accompanying drawings. In FIG. 1A, 1 is a conductive substrate, 2 is a photosensitive layer, 21 is a charge generating pigment, and 22 is a binder 2.
3 shows an organic acceptor compound dispersed in a molecular form. Further, FIG. 1B shows a photosensitive member to which the organic hole transport material 24 dispersed in a molecular form is added. Further, FIG. 2 shows transfer of an electrostatic latent image in the sequential transfer method. In the figure, 3 is an electrostatic recording medium, 31 is a dielectric layer of the electrostatic recording medium, 32 is a conductive layer of the electrostatic recording medium, 4 is a conductive roller, and 5 is a voltage application at the time of transfer. Depending on the setting of the applied voltage value, a mode in which the charged portion of the photoconductor is transferred (positive transfer) and a mode in which the non-charged portion or the low-charged portion of the photoconductor is transferred (negative transfer) can be selected.

Such a photoreceptor of the present invention is excellent in chargeability and sensitivity, and when used in a sequential transfer process, under a transfer condition in which an abnormal image such as a blank area does not appear, the transfer potential of the recording medium is kept at a sufficient developing density. You can get as high as you can. The reason for this is not clear at this point in time, but it is presumed that high chargeability and high sensitivity also lead to a high transfer potential for the following reasons.

That is, in the case of aiming at high image quality,
It is necessary to perform each process up to visualization under mild conditions, resulting in a slow process speed. In such a case, it takes a time from charging to transfer. When a photoconductor with poor chargeability is used, the dark decay rate is slow, so
The potential contrast between the image portion and the non-image portion is lowered, and the potential contrast on the electrostatic recording material after transfer is also lowered. Further, the excellent sensitivity leads to a large potential contrast on the photoconductor and a high potential contrast on the electrostatic recording body. Further, an advantage of using the organic acceptor compound is that both positive and negative charge polarities can be dealt with by changing the compositions of the hole transport substance and the organic acceptor compound. The use of the organic acceptor compound also brings about a decrease in residual potential and a prolongation of the electrostatic property of the photoreceptor. The cause of these improvements is not clear, but one of them is to prevent the reduction of the internal electric field of the charge generating pigment and to reduce the electric resistance by pulling out the electrons out of the holes and electrons generated in the charge generating pigment by light irradiation. It is possible to prevent the decrease.

When an organic acceptor compound is used,
The weight composition ratio of the organic acceptor compound and the hole transport material is 1/50 to 5/1. When the content of the organic acceptor compound is less than this, repetition of electrostatic characteristics is lowered, and when it is more than this, the charging property is deteriorated.

The role of the binder in the photoreceptor is not only good dispersion of the charge generating pigment and the molecular dispersion of the hole transport material, but also the mechanical strength of the photoreceptor required in the copying process. There is. However, since the process in which the photoreceptor of the present invention is used does not require development on the photoreceptor,
Cleaning is also much weaker than the Carlson process. Therefore, the amount of the binder used can be reduced in the photoconductor of the present invention as compared with the photoconductor for the Carlson process.

The binder which can be used in the present invention includes polyethylene, polypropylene, acrylic resin, methacrylic resin, vinyl chloride resin, vinyl acetate resin, epoxy resin, polyurethane resin, phenol resin, polyester resin, alkyd resin, polycarbonate. resin,
Addition polymerization type resins such as silicone resins and melamine resins, polyaddition type resins, polycondensation type resins and copolymer resins containing two or more of these repeating units, for example, vinyl chloride-vinyl acetate copolymer, chloride Mention may be made of vinyl-vinyl acetate-maleic anhydride copolymer resins. The amount of these binders in the entire photoreceptor is 20 to 90% by weight,
It is preferably 30 to 70% by weight.

The thickness of the photosensitive layer of the present invention is preferably 5 to 30 μm. If it is thinner than this, the charging property is lowered, and if it is thicker, the electrostatic capacity of the photoconductor is lowered and the transfer potential is lowered. Examples of the conductive substrate that can be used in the present invention include a metal plate such as aluminum, nickel, copper and stainless steel, a metal drum or a metal foil, and a plastic film or glass coated with a thin film of aluminum, tin oxide or copper iodide. Etc.

In the photoreceptor of the present invention, an undercoat layer may be provided between the photosensitive layer and the conductive substrate for the purpose of improving the charging property. As these materials, in addition to the binder material, polyamide resin, polyvinyl alcohol, casein, polyvinylpyrrolidone or the like can be used. To prepare the photoreceptor of the present invention, a known method such as a dipping method, blade coating, or spray coating of a photosensitive layer-forming solution prepared by dissolving or dispersing the above-mentioned materials in an organic solvent by a ball mill, ultrasonic wave or the like. Then, the photosensitive layer may be formed by coating on the substrate.

[0038]

EXAMPLES The present invention will be described below with reference to examples, but the embodiments of the present invention are not limited thereby.

Example 1 1 g of ε-type phthalocyanine pigment was added to polycarbonate Z (P
C-Z) solution 10 g (dissolved in tetrahydrofuran at 10% by weight) and ball milling with 9 g of tetrahydrofuran, 10% by weight of pigment composition, 50% by weight of PC-Z composition, organic hole transporting material (D2-12). ) Is 4
A 15% by weight PC-Z solution, an acceptor compound, and an organic hole transporting substance were added so that the amount became 0% by weight, to prepare a coating solution for the photoreceptor. This solution was applied on an aluminum substrate and heated and dried to prepare a single-layer type photoreceptor having a thickness of about 12 μm. This photoreceptor is corona charged at + 6.5KV in the dark,
When the surface potential after dark decay reaches 600V, 30
The tungsten light of lux was irradiated for 1 second. After light irradiation,
The electrostatic recording paper was brought close to the surface of the photoconductor, and the transfer paper was separated while being pressed against the surface of the photoconductor by the conductive roller. At this time, the potential difference between the conductive roller and the exposed portion of the photosensitive member is +
A voltage was applied so that it would be 800V. When the surface potential on the electrostatic recording paper was measured, -100 V was obtained. According to the electrostatic capacity of the electrostatic recording paper, this potential has a surface charge density of 7.
It was found that the surface charge density reached a value corresponding to 0 × 10 ^-8 C / cm ² and sufficient for development. When the transfer potential was measured on the unexposed portion under the same conditions, the transfer potential was 0V.

Examples 2 to 7 Photosensitive layers were prepared and transfer characteristics were measured in the same manner as in Example 1 except that the hole transporting material of Example 1 was changed to that shown in Table 8. The measurement results are shown in Table 8.

[Table 8]

Examples 8 to 14 The hole transporting material of Example 1 was replaced with those shown in Table 9, the following acceptor compound was further added, and the pigment composition was changed to 4
%, Resin composition 50%, organic hole transport material composition 30%, and acceptor compound composition 16% to prepare a photosensitive layer. Then, when the transfer characteristics were measured in the same manner as in Example 1, 0 V was obtained in the unexposed area and the results in Table 9 were obtained in the exposed area.

[Chemical 9]

[Table 9]

Example 15 The acceptor compound of Example 8 was replaced with the following compound, and further the pigment composition was 2%, the resin composition was 50%, the organic hole transport material composition was 8%, and the acceptor compound composition was 40%. It was created. Corona charging at -6KV and charging potential -6
When the voltage reached to 00V, exposure was performed in the same manner as in Example 1. Then, a voltage was applied to the conductive roller to transfer the electric charge to the electrostatic recording paper in the same manner as in Example 1. A voltage was applied to the conductive roller so that the difference from the charged portion of the photoconductor was + 800V. The result of -110V in the unexposed area and 0V in the exposed area was obtained.

[Chemical 10]

Comparative Example 1 The following compound was used as the hole transport material of Example 1 and Example 1 was used.
When charged in the same manner as above, dark decay was too large, and a transfer potential of −45 V in the unexposed area and −130 V in the exposed area were obtained.

[Chemical 11]

Comparative Example 2 A charge generation layer comprising the phthalocyanine used in Example 1 and a resin (weight ratio 1/1) was formed on the substrate of Example 1 in an amount of about 0.
5 μm was provided. A liquid in which 1 g of the hole-transporting material used in Example 9 was dissolved in 18 g of tetrahydrofuran was applied thereon and a charge-transporting layer having a thickness of 12 μm was provided. When the transfer potential of this photosensitive member was measured in the same manner as in Example 15, the results were −50 V in the unexposed portion and 0 V in the exposed portion.

[0045]

The single-layer type photoreceptor of the present invention has a structure in which at least particulate copper phthalocyanine and an organic transporting material are dispersed in a binder, or in addition to these, an organic acceptor compound is added. In particular, when the compounds represented by the general formulas (II) to (VIII) are used as the organic hole transport material, a high transfer potential can be obtained when used in the electrostatic transfer process.

[Brief description of drawings]

FIG. 1A is an explanatory view conceptually showing a material contained inside a photosensitive layer of a single-layer type electrophotographic photosensitive member according to the present invention. (B) It is an explanatory view conceptually showing the material contained in the photosensitive layer of the single-layer type electrophotographic photosensitive member according to the present invention.

FIG. 2 is an explanatory diagram showing an example of latent image transfer in sequential transfer.

[Explanation of symbols]

 1 Conductive Substrate 2 Photosensitive Layer 21 Charge Generating Pigment 22 Organic Acceptor Compound 23 Binder 24 Organic Hole Transport Material 3 Electrostatic Recording Material 31 Dielectric Layer 32 Conductive Layer 4 Conductive Roller 5 Voltage Application at Transfer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location G03G 5/05 104 B (72) Inventor Hiroshi Kondo 1-3-6 Nakamagome, Ota-ku, Tokyo Stock company Ricoh

Claims (4)

[Claims] 1. An electrostatic latent image is formed on an electrophotographic photosensitive member, and then an electrostatic recording member is brought into contact with the surface side of the photosensitive member, and a voltage is applied between the photosensitive member and the electrostatic recording member. Then, an electrostatic latent image corresponding to the photoconductor is transferred onto the electrostatic recording body, and thereafter, an electron used in an electrophotographic method of a latent image transfer system for visualizing the electrostatic latent image on the electrostatic recording body. In a photographic photoreceptor, a single-layer organic photosensitive layer is provided on a conductive substrate directly or via an undercoat layer, and the photosensitive layer is at least particulate copper phthalocyanine represented by the following formula (I) and an organic positive layer. An electrophotographic photoreceptor for transferring a latent image in which a hole transport material is dispersed in a binder. [Chemical 1] 2. The electrophotographic photoreceptor for transferring a latent image according to claim 1, wherein an organic acceptor compound is further dispersed in the binder of the photosensitive layer. 3. The electrophotographic photoreceptor for transferring a latent image according to claim 1, wherein the weight composition ratio of the organic acceptor compound and the organic hole transporting material is in the range of 1/50 to 5/1. 4. An organic hole transporting material represented by the following general formula (II):
1. At least one selected from (VIII).
3. The electrophotographic photoreceptor for transferring a latent image according to any one of 3 above. [Chemical 2] (In the formula, Ar₁, Ar₂And Ar₃Is an unsubstituted
Or alkyl group, alkoxy group, thioalkoxy group,
Reeloxy group, halogen atom, cyano group, nitro group
Or an aryl group or heterocyclic group substituted with an amino group
Represent ) [Chemical 3](In the formula, R₁And R₂Is a hydrogen atom, an alkyl group or
Represents a reel group and also R₁And R₂Even if a ring is formed between
Good. Ar₁Represents an arylene group or a heterocyclic group, Ar₂And
And Ar₃Represents an alkyl group, an aryl group or a heterocyclic group.
You ) [Chemical 4] (In the formula, Ar₁, Ar₂And Ar₃Is an unsubstituted
Or alkyl group, alkoxy group, halogen atom, cyano
Aryl groups substituted with groups, nitro groups or amino groups
Or represents a heterocyclic group. ) [Chemical 5](In the formula, Ar₁, Ar₂, Ar_FiveAnd Ar₆No substitution
Or alkyl group, alkoxy group, halogen source
Substituted with a cyano group, nitro group or amino group
Aryl group, Ar₃And Ar_FourNo substitution, yes
Represents an arylene group substituted with the above substituents. ) [Chemical 6](In the formula, Ar₁, Ar₂, Ar₃And Ar_FourNo substitution
Or alkyl group, alkoxy group, halogen source
Substituted with a cyano group, nitro group or amino group
An aryl group, X is an alkylene group, sulfur, oxygen or (C
H = CH) n. n represents an integer of 1 or more. ) [Chemical 7] (In the formula, Ar₁Is an unsubstituted or alkyl group,
Lucoxy group, halogen atom, cyano group, nitro group
Is an aryl group or heterocyclic group substituted with an amino group,
r₂And Ar₃Is an alkyl group, phenyl group or naphthyl group
Represents ) [Chemical 8](In the formula, Ar₁, Ar₂, Ar₃And Ar_FourNo substitution
, Or alkyl group, alkoxy group, halogen atom
Or an aryl group or heterocyclic group substituted with an amino group
Represents Further, n represents an integer of 0 or 1. )