JPH0434437A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To improve durability and photosensitive characteristics by providing a photosensitive layer contg. a specific olefin component as an effective component. CONSTITUTION:The photosensitive film 2 contg. at least one kind of the alkylpyrene expressed by formula I is provided on a conductive base 1. In the formula I, A<1> denotes a substd. or unsubstd. arom. hydrocarbon group; A<2> denotes a substd. or unsubstd. alkyl group or aryl group; A<3> denotes a hydrogen atom, substd. or unsubstd. alkyl group or aryl group. Further (m) and (n) are 1 or 2 integer; m+n=3, where A<1>, A<3> or A<2> may be respectively the same or different when (m) or (n) is 2. The photosensitive characteristics are improved in this way and the strength to thermal and mechanical impart is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an electrophotographic photoreceptor, and more particularly to an electrophotographic photoreceptor containing a specific compound in its photosensitive layer.

[Prior art]

Conventionally, inorganic materials such as selenium, cadmium sulfide, and zinc oxide have been used as photoconductive materials for photoreceptors used in electrophotography. The "electrophotographic method" referred to here generally means that a photoconductive photoreceptor is first charged in a dark place by, for example, corona discharge, and then imagewise exposed to selectively dissipate the charge only in the exposed areas. An electrostatic latent image is obtained, and this latent image area is developed and visualized using electrostatic fine particles (toner) composed of a coloring material such as a dye or pigment and a binder such as a polymeric substance to form an image. This is one of the image forming methods.

The basic characteristics required of a photoreceptor in such electrophotography are (1) ability to be charged to an appropriate potential in a dark place, (2) less dissipation of charge in a dark place,
(3) Examples include scales that quickly dissipate charge when irradiated with light.

Incidentally, the reality is that each of the above-mentioned inorganic substances has many advantages, but also has various disadvantages. For example, selenium, which is currently widely used, fully satisfies the conditions (1) to (3) above, but the manufacturing conditions are difficult, the manufacturing cost is high, it is not flexible, and it cannot be processed into a belt shape. It also has disadvantages, such as being difficult to handle and being sensitive to heat and mechanical shock, requiring careful handling.

Cadmium sulfide and zinc oxide are used as photoreceptors by being dispersed in resin as a binder.

It cannot be used repeatedly as it is because of mechanical defects such as smoothness, hardness, tensile strength, and abrasion resistance.

In recent years, electrophotographic photoreceptors using various organic materials have been proposed in order to eliminate the drawbacks of these inorganic materials, and some of them have been put into practical use. For example, poly-N-vinylcarbazole and 2,4,7-dolinitrofluorene-9
-on (described in U.S. Pat. No. 3,484,237), a photoreceptor made by sensitizing poly-N-vinylcarbazole with a pyrylium salt dye (Japanese Patent Publication No. 48-2
5658), a photoreceptor whose main component is an organic pigment (described in JP-A-47-37543), a photoreceptor whose main component is a eutectic complex consisting of a dye and a resin (JP-A-47-37543), a photoreceptor whose main component is a eutectic complex consisting of a dye and a resin
No. 7-10735), a photoreceptor made by dye-sensitizing a triphenylamine compound (U.S. Pat. No. 3,180)
, No. 730), photoreceptors using amine derivatives as charge transport materials (Japanese Unexamined Patent Publication No. 195254/1983), poly-
A photoreceptor using N-vinylcarbazole and an amine derivative as a charge transport material (Japanese Patent Application Laid-Open No. 1155/1983),
A photoreceptor using a benzidine compound among polyfunctional tertiary amine compounds as a photoconductive material (U.S. Pat. No. 3,265,
No. 496, Japanese Patent Publication No. 39-11546, Japanese Unexamined Patent Publication No. 53
-27033). Although these photoreceptors have excellent properties and are considered to be of high practical value, considering the various requirements for photoreceptors in electrophotography, it is still difficult to fully meet these requirements. The reality is that we have not been able to obtain anything that satisfies us.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the various drawbacks of the conventional photoreceptors mentioned above and to provide a photoreceptor that fully satisfies the conditions required in electrophotography. Another object of the present invention is to provide an electrophotographic photoreceptor that is easy to manufacture, relatively inexpensive, and has excellent durability.

[Means to solve the problem]

According to the present invention, there is provided a photoreceptor for electrophotography, comprising a photosensitive layer containing as an active ingredient at least one alkylpyrene compound represented by the following general formula (I) on a conductive support. be done.

(In the formula, A1 represents a substituted or unsubstituted aromatic hydrocarbon group, A2 represents a substituted or unsubstituted alkyl group or aryl group, and A3 represents a hydrogen atom, a substituted or unsubstituted alkyl group, or an aryl group. m and n are 1 or 2
is an integer, and ■+n=3. However, when n is 2, A'', A3, or A2 may be the same or different, respectively.) In the present invention, the alkylpyrene compound represented by the general formula (1) to be contained in the photosensitive layer is, for example, General formula (II) (wherein A1.A", A", m and n are the same as above)
It is easily produced by reducing the olefin compound represented by The alkylpyrene compound represented by the general formula (1) obtained by the above synthesis method will be explained in more detail.

In the general formula (I), examples of the aromatic hydrocarbon group of A1 include non-fused carbocyclic aromatic hydrocarbon groups and fused polycyclic hydrocarbon groups such as a phenylene group, a biphenylene group, and a terphenylylene group.

In this case, the fused polycyclic hydrocarbon group preferably has a ring having 18 or less carbon atoms, such as a pentalenylene group, indenylene group, naphthylene group, azulenylene group, heptarenylene group, biphenylene group, aS
- indasenylene group, fluorenylene group, S-indacenylene group, acenaphthyleneylene group, preadenylene group, acenaphthenylene group, phenalenylene group, phenanthrylene group, anthrylene group, fluoranthenylene group, acephenanthrylenylene group, aceantrylenylene group ,
Examples include triphenylene group, pyrenylene group, chrysenylene group, and naphthacenylene group.

When A2 and A3 are aryl groups, monovalent groups of the above-mentioned aromatic hydrocarbon groups can be mentioned. Moreover, A1, A2 and A3 can have the following substituents.

(1) Halogen atom, cyano group, nitro group (2) Alkyl group, preferably 02-C, especially 01-C8,
More preferred are C0 to C4 linear or branched alkyl groups, and these alkyl groups further include a fluorine element,
It may contain a phenyl group substituted with a hydroxyl group, a cyano group, a C1-C4 alkoxy group, a phenyl group or a halogen atom, a C2-C4 alkyl group or an 01-04 alkoxy group. Specifically, methyl group, ethyl group,
n-propyl group, i-propyl group, t-butyl group, S-
butyl group, n-butyl group, i-butyl group, trifluoromethyl group, 2-hydroxyethyl group, 2-cyanoethyl group, 2-ethoxyethyl group, 2-methoxyethyl group, benzyl group, 4-chlorobenzyl group, Examples include 4-methylbenzyl group, 4-methoxybenzyl group, 4-phenylbenzyl group, and the like.

(3) Alkoxy group (-0R1); R represents the alkyl group defined in (2). Specifically, methoxy group, ethoxy group, n-propoxy group, i-propoxy group, t-
Examples include butoxy group, n-butoxy group, S-butoxy group, i-butoxy group, 2-hydroxyethoxy group, 2-cyanoethoxy group, benzyloxy group, 4-methylbenzyloxy group, trifluoromethoxy group, and the like.

(4) Aryloxy group Niaryl groups include phenyl and naphthyl groups. This may contain a C-C4 alkoxy group, a C-C4 alkyl group, or a halogen atom as a substituent. Specifically, phenoxy group, 1-naphthyloxy group, 2-naphthyloxy group,
4-methylphenoxy group, 4-methoxyphenoquino group,
Examples include 4-chlorophenoxy group and 6-methyl-2-naphthyloxy group.

(5) Alkylmercapto group (-sRt); R1 is (2
) represents an alkyl group defined in Specific examples include methylthio group, ethylthio group, phenylthio group, and P-methylphenylthio group.

represents an alkyl group or an aryl group as defined in (2), and examples of the aryl group include a phenyl group, a biphenylyl group, or a naphthyl group;
It may contain an alkoxy group of 1, an alkyl group of 01-04, or a halogen atom as a substituent. R□ and R2 may jointly form a ring, or may jointly form a ring with the carbon atom on the aryl group. ) Specifically, amino group, diethylamino group, N-methyl-N-phenylamino group, N,N-diphenylamino group, N,N-di(P-tolyl)amino group, dibenzylamino group, piperidino group , a morpholino group, a eurolidyl group, and the like.

(7) Examples include alkylene dioxy groups and alkylene dithio groups such as methylene dioxy groups and methylene dithio groups.

Further, when A2 and A:l are alkyl groups, the alkyl groups described in section (2) are used as the alkyl groups.

Representative examples of the alkylpyrene compound represented by the general formula (1) are shown below.

(1) Fl, n=2 The photoreceptor of the present invention contains one or more of the above alkylpyrene compounds in the photosensitive layer 2 (2', 2", 2' or 2tr/7). However, depending on how these alkylpyrene compounds are applied, the results shown in Figures 1, 2,
It can be used as shown in FIGS. 3, 4 or 5.

The photoreceptor shown in FIG. 1 has a photosensitive layer 2 comprising a compound, a sensitizing dye, and a binder (binder resin) on a conductive support 1. The photoreceptor shown in FIG. The alkylpyrene compound here acts as a photoconductive substance, and the generation and transfer of charge carriers necessary for light attenuation take place via the alkylpyrene compound. However, alkylpyrene compounds have almost no absorption in the visible region of light, so in order to form images with visible light, it is necessary to sensitize them by adding a sensitizing dye that absorbs in the visible region. be.

The photosensitive member shown in FIG. 2 has a photosensitive layer 2' provided on a conductive support 1, in which a charge generating substance 3 is dispersed in a charge transporting medium 4 made of an alkylpyrene compound and a binder. . The alkylpyrene compound here is a binder (
or binders and plasticizers) form the charge transport medium, while the charge generating substance 3 (charge generating substance such as an inorganic or organic pigment) generates charge carriers. In this case, the charge transport medium 4 is mainly responsible for receiving charge carriers generated by the charge generating substance 3 and transporting them. In this photoreceptor, the basic condition is that the absorption wavelength regions of the charge generating substance and the alkylpyrene compound do not overlap each other, mainly in the visible region.

This is because in order to efficiently generate charge carriers in the charge generation material 3, it is necessary to transmit light to the surface of the charge generation material. The alkylpyrene compound represented by the general formula (1) has almost no absorption in the visible region, and generally absorbs light in the visible region and is particularly effective as a charge transport material when combined with a charge generating material 3 that generates charge carriers. Its feature is that it works as a.

The photoreceptor in FIG. 3 has a photosensitive layer 2 consisting of a conductive support 1, a charge generation layer 5 mainly composed of a charge generation substance 3, and a charge transport layer 4 containing an alkylpyrene compound.
' is provided. In this photoreceptor, light transmitted through the charge transport layer 4 reaches the charge generation layer 5, and charge carriers are generated in that region, while the charge transport layer 4 receives charge carriers and transports them. The charge carriers necessary for light attenuation are generated by a charge generation substance 3, and the charge carriers are transported by a charge transport layer 4 (mainly composed of an alkylpyrene compound). This mechanism is similar to the explanation given for the photoreceptor shown in FIG.

The photoreceptor in FIG. 4 is obtained by reversing the layering order of the charge generation layer 5 and the charge transport layer 4 containing an alkylpyrene compound in FIG. 3, and the mechanism of charge carrier generation and transport is as explained above. You can do the same thing.

In this case, considering mechanical strength, the charge generation layer 5 is
A protective layer 6 can also be provided thereon.

In order to actually produce the photoreceptor of the present invention, in the case of the photoreceptor shown in Figure 1, one or more alkylpyrene compounds are dissolved in a solution containing a binder, and this is further added The photosensitive layer 2 may be formed by preparing a liquid containing the photosensitive material, coating it on the conductive support 1, and drying it.

The appropriate thickness of the photosensitive layer is 3 to 50 .mu.m, preferably 5 to 20 .mu.m thick. The amount of the alkylpyrene compound in the photosensitive layer 2 is 30 to 70% by weight, preferably about 50% by weight, and the amount of the sensitizing dye in the photosensitive layer 2 is 0.1 to 5% by weight.
% by weight, preferably 0.5-3% by weight. Brilliant Green and Victoria Blue B are used as sensitizers.
, triarylmethane dyes such as methyl violet, crystal violet, acid violet 6B, xanthine dyes such as Rhodamine B, Rhodamine 6G, Rhodamine G Extra, Eosin S, erythrosine, rose bengal, fluorescein, thiazine dyes such as methylene blue, Cyanine dyes such as cyanine, pyrylium dyes such as 2,6-diphenyl-4-(N,N-dimethylaminophenyl)thiapyrylium verchlorate, benzopyrylium salts (described in Japanese Patent Publication No. 48-25658), etc. can be mentioned. Note that these sensitizing agents may be used alone or in combination of two or more.

Furthermore, in order to produce the photoreceptor shown in FIG. 2, fine particles of the charge generating substance 3 are dispersed in a solution containing one or more alkylpyrene compounds and a binder, and these are dispersed on a conductive support. The photosensitive layer 2' may be formed by coating the photosensitive layer 2' on the body 1 and drying it.

The thickness of the photosensitive layer 2' is 3 to 50 μm, preferably 5 to 20 μm.
μm is appropriate. The amount of the alkylpyrene compound in the photosensitive layer 2' is 10 to 95% by weight, preferably 30 to 90% by weight.
% by weight, and the amount of the charge generating substance 3 in the photosensitive layer 2' is 0.1 to 50% by weight, preferably 1 to 20% by weight.

Examples of the charge generating substance 3 include inorganic pigments such as selenium, selenium-tellurium, cadmium sulfide, cadmium-selenium sulfide, and α-silicon, and examples of organic pigments include CI Pigment Blue 25 (Color Index CI 2).
1180), CI Pigment Red 41 (CI
21200), Sea Eye Acid Red 52 (CI 4
5100), CI Basic Red 3 (CI452)
10), an azo pigment having a carbazole skeleton (Japanese Patent Application Laid-Open No.
3-95033), azo pigments having a distyrylbenzene skeleton (Japanese Unexamined Patent Publication No. 53-133445), azo pigments having a triphenylamine skeleton (described in Unexamined Japanese Patent Application No. 53-132347), dibenzo Azo pigments having a thiophene skeleton (described in JP-A-54-21728), azo pigments having an oxadiazole skeleton (
(described in JP-A-54-12742), azo pigments having a fluorenone skeleton (described in JP-A-54-22834), azo pigments having a bisstilbene skeleton (described in JP-A-54-17733) , an azo pigment having a distyryloxadiazole skeleton (JP-A-54-212
9), azo pigments having a distyrylcarbazole skeleton (described in JP-A-54-14967), and azo pigments 1, such as C.I. Pigment Blue 16 (described in JP-A-54-14967)
Phthalocyanine pigments such as CI 74100), indigo pigments such as CI Butt Brown 5 (CI 73410) and CI Butt Dye (CI 73030).

Examples include perylene pigments such as Argo Scarlet B (manufactured by Bayer AG) and Indance Scarlet R (manufactured by Bayer AG). Note that these charge generating substances may be used alone or in combination of two or more types.

Furthermore, in order to produce the photoreceptor shown in FIG. 3, a charge generating substance is vacuum-deposited on one or more conductive supports, or fine particles 3 of a charge generating substance are deposited in a suitable solvent in which a binder is dissolved if necessary. The charge generation layer 5 is formed by coating the dispersion and drying it, and if necessary, performing surface finishing and film thickness adjustment by methods such as puff polishing, and then forming the charge generation layer 5 on which one or more of the The charge transport layer 4 may be formed by applying a solution containing two or more types of alkylpyrene compounds and a binder and drying the solution. The charge generating material used to form the charge generating layer 5 is the same as that used in the description of the photosensitive layer 2'.

The thickness of the charge generation layer 5 is 5 μm or less, preferably 2 tones or less, and the thickness of the charge transport layer 4 is suitably 3 to 50 tones, preferably 5 to 20 tones. If the charge generation layer 5 is of a type in which fine particles 3 of the charge generation layer material are dispersed in a binder, the proportion of the fine particles 3 of the charge generation material in the charge generation layer 5 is preferably 10 to 95% by weight. is about 50 to 90% by weight. Further, the amount of the compound in the charge transport layer 4 is 10 to 95% by weight, preferably 30 to 90% by weight. To produce the photoreceptor shown in FIG. 4, a solution containing an alkylpyrene compound and a binder is applied onto the conductive support 1 and dried to form the charge transport layer 4. The charge generation layer 5 may be formed by applying a dispersion of fine particles of the charge generation layer material in a solvent in which a binder is dissolved, if necessary, on the transport layer by a method such as spray coating and drying. The amount ratio of the charge generation layer or charge transport layer is the third
The contents are the same as those explained in the figure. A protective layer 6 is further formed on the charge generation layer 5 of the photoreceptor thus obtained by spray coating or the like with a suitable resin solution, thereby producing the photoreceptor shown in FIG. 5. As the resin used here, the binder described later can be used.

In the production of any of these photoreceptors, the conductive support 1 is made of a metal plate or metal foil such as aluminum, a plastic film on which metal such as aluminum is vapor-deposited,
Alternatively, paper that has been subjected to conductive treatment may be used. Also,
As the binder, condensation resins such as polyamide, polyurethane, polyester, epoxy resin, polyketone, and polycarbonate, and vinyl polymers such as polyvinyl ketone, polystyrene, potu-N-vinylcarbazole, and polyacrylamide are used, but the insulating properties Any resin that is large and adhesive can be used.

If necessary, a plasticizer is added to the binder, and examples of such plasticizers include halogenated paraffins, polychlorinated biphenyls, dimethylnaphthalene, and dibutyl phthalate.

Furthermore, in the photoreceptor obtained as described above, an adhesive layer or a barrier layer can be provided between the conductive support and the photosensitive layer, if necessary. Materials used for these layers include polyamide, nitrocellulose, aluminum oxide, etc., and the film thickness is preferably 1 μm or less.

To make a copy using the photoreceptor of the present invention, the photoreceptor surface is charged and exposed, then developed and, if necessary, transferred to paper or the like. The photoreceptor of the present invention has excellent advantages such as high sensitivity and flexibility.

[Example 1] The present invention will be explained below with reference to Examples. In addition.

In the following examples, all parts are by weight.

[Synthesis of compound of general formula (1)] (Synthesis example of compound Nα8) 2.00 g of 1-(4-N,N-diphenylaminostyryl)pyrene was dissolved in 20 mQ of tetrahydrofuran, and 5% palladium-carbon was added to the solution. 40 g was added, and hydrogenation was carried out in a large shaking hydrogenation apparatus at room temperature and 1 atm hydrogen pressure. After the hydrogenation was completed, the mixture was filtered through Celite and concentrated under reduced pressure to obtain an oily substance. This was treated with a silica gel column [eluent: toluene/n-hexane (1:2) mixed solvent] and then recrystallized from an ethanol/ethyl acetate mixed solvent to give colorless columnar crystals as shown by the following formula. l-[2-(4-N,N-diphenylaminophenyl)ethyl]pyrene 1.71 g (yield 85
．． 1%). The melting point was 121.5-122.5°C.

Elemental analysis value (%) CHN Actual value 91.17 5,64 2.90 The infrared absorption spectrum (KBr tablet method) of this compound shows a 960 cm
-" absorption based on the C-H out-of-plane bending vibration of the transolefin was observed to disappear.

Note that other alkylpyrene compounds were also synthesized in the same manner as above.

Example 1 76 parts of Diane Blue (CI Pigment Blue 25, CI 21180) as a charge generating substance, 1260 parts of a 2% tetrahydrofuran solution of polyester resin (Vylon 200, manufactured by Toyobo Co., Ltd.) and 3700 parts of tetrahydrofuran were ground and mixed in a ball mill. The obtained dispersion was applied using a doctor blade onto the aluminum surface of a conductive support made of a polyester base coated with aluminum vapor, and air-dried to form a charge generation layer having a thickness of about 1 μm.

On the other hand, as a charge transport substance, 2 parts of an alkylpyrene compound of Compound Specific Example Nα11, 2 parts of polycarbonate resin (Panlite 1300, manufactured by Teijin), and 16 parts of tetrahydrofuran were mixed and dissolved to form a solution, and this was mixed and dissolved to form a solution. Apply on the generation layer using a doctor blade and apply at 80%
℃ for 2 minutes, then dried at 120℃ for 5 minutes to a thickness of approx.
A photoreceptor Nα1 was prepared by forming a charge transport layer with a thickness of 0 μm.

Examples 2 to 33 Photoreceptors Nα2-33 were prepared in exactly the same manner as in Example 1, except that the charge generating substance and the charge transporting substance (alkylpyrene compound) were replaced with those shown in Table 1.

Example 34 A charge generation layer was formed by vacuum evaporating selenium to a thickness of about 1 μm on an aluminum plate having a thickness of about 300 μm. Next, 2 parts of an alkylpyrene compound of Nα11, a polyester resin (Polyester Adhesive 4900 manufactured by DuPont)
0) 3 parts and 45 parts of tetrahydrofuran are mixed and dissolved to prepare a charge transport layer forming liquid, and this is applied onto the above charge generation layer (selenium vapor deposited layer) using a doctor blade, air dried, and then heated under reduced pressure. Dry at the bottom to a thickness of about 10μ■
photoreceptor Nα34 of the present invention by forming a charge transport layer of
I got it.

Example 35 Same as Example 34, except that a perylene pigment was used instead of selenium to form the charge generation layer (however, the thickness was about 0.6 μm), and an alkylpyrene compound NQII was used as the charge transport material. A photoreceptor Nα35 was prepared in the same manner.

Example 36 A mixture of 1 part of diampoule (same as that used in Example 1) and 158 parts of tetrahydrofuran was ground and mixed in a ball mill, and then 12 parts of an alkylpyrene compound of Nα11 and a polyester resin ( A photosensitive layer forming solution obtained by adding 18 parts of Polyester Adhesive 49000 (manufactured by DuPont) and further mixing was applied onto an aluminum-deposited polyester film using a doctor blade, and dried at 100°C for 30 minutes to form a thick film. A photoreceptor Nα36 of the present invention was prepared by forming a photoreceptor layer having a thickness of approximately 16 μm.

Example 37 On a polyester film substrate coated with aluminum,
The charge transport layer coating solution used in Example 1 was applied with a blade in the same manner as in Example 1, and then dried to form a charge transport layer with a thickness of about 20 μm. Bisazo pigment (P-2)13.
5 parts, polyvinyl butyral (product name: XYHL Union Carbide Plastics Co., Ltd.) 5.4 parts, THF
After pulverizing and mixing 680 parts of ethyl cellosolve and 1020 parts of ethyl cellosolve in a ball mill, 1700 parts of ethyl cellosolve was added and mixed with stirring to obtain a charge generation layer coating liquid. This coating solution was spray coated onto the above charge transport layer and dried at 100 DEG C. for 10 minutes to form a charge generation layer having a thickness of about 0.2 mm. Furthermore, a methanol/n-butanol solution of polyamide resin (trade name: CM-8000, manufactured by Toshi) was spray coated on top of this charge generation layer and dried at 120°C for 30 minutes to protect the layer to a thickness of about 0.5R. Photoreceptor NQ3 by forming a layer
7 was created.

Photoreceptors N (11 to 37) thus produced were tested using a commercially available electrostatic copying paper tester (KK Kawahi Nichi Denki Seisakusho 5P).
After electrifying the photoreceptor by performing corona discharge of 16KV or +6KV for 20 seconds using Model 428, the surface potential Vpo (volts) at that time was measured after being left in a dark place for 20 seconds. Surface illuminance is 4.5
lux so that the surface potential is 1 of Vpo.
The time (seconds) until the temperature reached 72 was determined, and the exposure amount E1/2 (lux/second) was calculated. The results are shown in Table-2.

In addition, after each of the above-mentioned photoreceptors is charged using a commercially available electrophotographic copying machine, light is irradiated through the original image to form an electrostatic latent image, and the image is developed using a dry developer. When the image (toner image) was electrostatically transferred onto plain paper and fixed, a clear transferred image was obtained. A similarly clear transferred image was obtained when a wet developer was used as the developer.

Table-2 5... Charge generation layer 6...Protective layer

Claims (1)

[Claims] (1) A photoreceptor for electrophotography, comprising a photosensitive layer containing at least one olefin compound represented by the following general formula (I) as an active ingredient on a conductive support. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (I) (In the formula, A^1 is a substituted or unsubstituted aromatic hydrocarbon group, A^2 is a substituted or unsubstituted alkyl group or aryl group, A ^3 represents a hydrogen atom, a substituted or unsubstituted alkyl group, or an aryl group.m and n are integers of 1 or 2, and m+n=3.However, m or n
When is 2, A^1, A^3, or A^2 may be the same or different. )