JPS58199352A - electrophotographic photoreceptor - Google Patents

Abstract

PURPOSE:To enhance sensitivity of a photoreceptor, to reduce change of potentials on light and dark parts in repeated cycles of charging and exposure, and to improve photomemory effectively, by adding a specified hydrazone compd. to a layer of the photoreceptor. CONSTITUTION:The electrophotographic receptor has a layer contg. a hydrazone compd. having formula I in which R1-R4 are each H or halogen, and at least one is halogen; R5 is H, alkyl, or alkoxy; and R6, R7 are each optionally substd. alkyl or aralkyl or phenyl or a residue for forming a 5- or 6-membered ring together with N, such as formula II. The presence of this layer can enhance sensitivity of the electrophotographic receptor, reduce variations of potentials of light and dark parts in repeated cycles of charging and exposure, and yet, improve photomemory property effectively.

Description

[Detailed description of the invention]

This Komei has improved % details regarding electrophotographic photoreceptors.
It is intended to be used as an AM element that commands the electrophotographic properties of small molecules that give high electrophotographic properties. As a photoconductive material used in the photoreceptor Jk photoreceptor, it is important to know whether it is a photoconductive material such as selenium, sulfide, 5% saponification, and button. These lights * Wta material IP4,
An example of an advantage of using light is that it can be used to raise an excessive potential with clear performance, that there is little loss of energy in the sun, or that the potential can be dissipated inadvertently by irradiation with light. Is there bL 1711 % each 4 electric disadvantages 1 south @ Wataru 1
Q: Selenium-based photoreceptors are easily susceptible to problems such as uneven viewing, moisture, dirt, and pressure. 311g1c or %vessel # When the ambient temperature exceeds 40℃, the a3 habit becomes sick, and the emperor 1i! Decline in sexuality? 11. The statue has defects such as white spots or scratches on the helmet. Sulfur IL cadium photoreceptor rr% high t
11's Uekashi to stable g degree or fL from Haku and mic
AM series Mi% is represented by Rose Bengus n4 Masuto color #
It requires the sensitizing effect of
The M color sensitivity is 1rona 4II electric power 1, and the middle koji light gives 4 Genro color 4, so it has the disadvantage of not being able to give a female determined h me over a long period of time. . On the other hand, various organic photoconductive polymers including holvinyl-rubazole have been proposed, and the polymers of ζn et al.
Despite K's superiority in terms of lightness and other aspects, its practical application to date has been limited due to the lack of sufficient film formation properties and the lack of IfA, durability, and environmental issues. This was because it was inferior to inorganic photoconductive materials in terms of stability against changes. US Patent @ 4150987 Hydrazone compound showing KP such as common axis #IJ1 US Patent @ 383
Triarylpyrazoline compound described in JP-A No. 7851 etc., 1% JP-A-51-94828, JP-A-51-94828
Low molecular weight organic photoconductors such as 9-styrylanthracene compounds of #72 have been proposed in Japanese Patent Application No. 4829. By selecting a suitable binder for such a low molecular weight organic photoconductor, it becomes possible to overcome the drawbacks in film formability that have been prevalent in the field of organic photoconductive polymers. 1t,... cannot be said to be sufficient in terms of sensitivity. For this reason, in recent years, the photosensitive layer has been called the charge generation layer and 'fI.
A laminated structure with functionally separated IL# III + feeding layer was proposed. An electrophotographic photoreceptor using this 4JI structure as a photosensitive layer has been improved in terms of sensitivity to early light, charge retention ability, surface FA, etc. Such an electrophotographic photoreceptor is disclosed in US Pat. No. 3,837, for example.
No. 851, No. 5871882, and the like. However, using a conventional low molecular weight organic photoconductor for the charge transport layer7? , electron, and 4 true photoreceptors have not yet achieved sufficient sensitivity, and there are large fluctuations in the bright and dark potentials for repeated charging and A-photosynthesis, and there are points that need to be renumbered. . A first object of the present invention is to provide an electrophotographic photoreceptor which eliminates the above-mentioned drawbacks or disadvantages. The first object of the present invention is to provide a novel organic photoconductor.The third object of the present invention is to provide a novel organic photoconductor that is functionally separated into a charge generation layer and a charge transport layer, and has a nine-layer photosensitive layer of 4t/C. Our objective is to provide a standard electrotransport material tube. This object of the present invention is achieved by an electrophotographic photoreceptor having Fi and a hydrazone compound represented by the following general formula (1). 1 halogen atom selected from chlorine, bromine, and iodine,
At least one of them is halogen L・χ, and R5
represents a hydrogen atom, an alkyl group such as methyl, ethyl, propyl, butyl, or an alkoxy group such as methoxy, ethoxy, propoxy, butoxy, and R6 and Rv are the same or different); Good methyl, ethyl, propyl. Indicates an alkyl group such as butyl, an aralkyl group such as benzyl%7enether, naphthylmethyl, or phenyl At, and F
pyrrolidino, piperidino, covalent with 1R4, R7 or M atom;
Residues forming a 5- to 6-membered ring group such as morpholino are shown. Examples of substituents that the groups represented by R6 and Rν include alkyl groups such as methyl, ethyl, propyl, butyl,
Methoxy, ethoxy, propoxy, butoxy group, flukoxy group, fluorine% Hanaki, odor IA% El tree, etc. halogen atom, dimethylaino, diethyl aino, dipropyl and hashibutylaino group in sial group. Ru. Next, typical compound examples are shown for the hydrazone compound %lIK represented by the general formula (1).
m, r-ri0l2enyl-a-naphthylaine 6Q,
0f ((L236%le) xp nord 240ak, vinegar #
17.9 f (126 mol) of sulfur soda was added over a period of 20 minutes, followed by 5 and 6 tons (α59-6 l) of zinc powder, which was dispersed in a mixed solvent consisting of It was added over 15 minutes while controlling the temperature to ~35°C. After adding the zinc powder, it was stirred for 40 minutes and the solid content was extracted. Even after filtration and drying, the mixed butyric medium of 150 d% methanol and 280 d% methyl ethyl ketone was reconsolidated. %m, p, 164
Pale yellow crystals at ~5°C24. (l f was obtained. Yield 24%. Charge analysis Molecular formula 027H260α5 Calculation false Analysis value 0 75.76% 75.71% H6,14% 6.12% N &28% &29% OL 9.82% 980% Other compounds are also salted using the same synthesis method. In a preferred embodiment of the present invention, Fi is added to the charge transporting substance of the electrophotographic photoreceptor in which the photosensitive layer is functionally separated into a charge generation layer and a charge transporting layer. A hydrazone compound represented by formula (1) can be used.The charge-transfer I@ according to the present invention can be prepared by combining a hydrazone compound represented by the above-mentioned formula (1), a binder, and a taa bath agent KfB.
It is preferable to form the binder by applying a dissolved syrup and drying it.The binder used here is %
For example, Boria Relay) It resin, polysulfone resin, polyamide resin, acrylic resin, acrylonitrile resin, methacrylic resin, vinyl chloride resin, acetic acid vinyl m resin, phenolic resin, epoxy side resin, polyester resin, alkyd resin, polycarbonate , polyurethane i is a copolymer resin containing two or more of the repeating units of our resin, such as styrene-butadiene copoly! -, styrene-acryloethryl copolymer, styrene-maleic copolymer, and the like. In addition to such insulating polymers, organic photoconductive polymers such as polyhinylcarbazole and polyhinylpyrene in polyvinylanthracene can also be used. 1001 parts of the cocoon containing hydrazone compound
It is preferable to set it as 500 weight tons. The charge transport layer includes the charge generating layer and the electrical charge transport layer described below.
9. In the presence of an electric field, the charge generated from the charge generation layer is injected from the charge generation layer. CRT et al. have a pinnacle that can transport charge carriers to the surface of the tube. This IIL charge transport layer may have a Km layer above the generation layer and a KI1 layer below it.
However, it is better to place the charge transport PII on top of the charge generation layer, since this charge transport layer has a limit to which carriers can be transported. It is not possible to reduce the thickness to 1*. Generally, 5
Ikron to SO Ikron, but the preferable range is 8 Ikron to 20 Ikron. Preferably selected from those that do not dissolve in the bath, examples of isotropic agents include alcohols such as methanol, ethanol, and isopropanol, and ketones such as acetone, methyl ethyl ketone, and cyclohexylone. anidines such as N,N-dimethylformide and N,N-dimethylacedoamide, sulfoxides such as dimethylsulfoxide, and ethers such as tetrahydrofuran, dioxene, and ethylene glycol monomethyl ether. Esters such as methyl V-acid and ethyl chloride, fat-extended halogenated hydrocarbons such as chloroform & methylene dichloromethane, dichloroethylene, tetrachloroethylene, trichlorethylene, benzene, toluene, xylene, ligroin, monochlorobenzene , aromatic Ifi such as dichlorobenzene, etc. can be used. Tracing #, l:, Dip coating method, Spray coating method, Spinner coating method, Bead coating method,! It can be carried out using a coating method such as an ear percoating method, a blade coating method, a roller coating method, or a curtain coating method. It is preferable to heat and moxibustion after drying to the touch in I- & Hamo occlusion heat drying.Heating drying property % SoC ~ 200 °C temperature for 5 minutes ~ 2 hours sa @ time, stationary t or moxibustion This can be done under ventilation. The electric transport layer of the present invention may contain additives with varying amounts of Fi%. Such additives include diphenyl%
Diphenyl chloride% 0-1-7enyl 5P-fi-phenyl, ')'ff ruphthalate, dimethyl glycol phthalate, dioctyl heptatalate, triphenyl phosphorus, methylnaphthalene, pensifuji% hanawa frozen paraffin,
It can contain dilaurylthiopropionate, 3,5-dinitrosalicylic acid, various yuzu fluorocarbons, etc. The charge generation layer used in the present invention includes selenium, selenium-tellurium, biryllium, thiopyrylium-based strips, tutarocyanine-based # material, γ-anthonotron #114. Dibenzpyrenequinone family, Villandrois IIA pigments, trisazo pigments, disazo pigments, azo pigments, indigo IIA family, quinacridoxy pigments, non-monetary, first-order quinocyanine, quinocyanino or #'iI#f publication kAh4-143645 A separate hybj- or a resin fraction can be used from a single alumina made of silicon or the like. IJ Haizensada is
Examples include the following compounds and 1L compounds. Charge generating substance fl) Amorphous silicon (2) Selenium-tellurium (3) Selenium-arsenic (4) Cadmium sulfide (5) (7) 1 (Jk(,2,,. (51) 1 Cdb C
2'16-Squaric acid → Hata dye - Ingo dye (C, 1,, &78000) - Thioindigo dye (C, 1,, +Th78800) (61)
The β-type copper phthalocyanine charge generation layer can be formed by dispersing the charge generator described above in a suitable binder and processing it on the 1 and -rLtiIi bodies. It can be prayed by K to form a membranous canal spider, and it has a wide range of aphrodisiacs as a binding agent that can be used for 1 formed by a turtle
It can be precipitated from a@ fat and also poly-N-vinylcarbazole. A+ can be obtained from photoconductive polymers such as polyvinyl anotra and polyvinyl pyrene - preferably polyvinyl butyral, polyarylates (such as monopolymers of bisphenol and phthalic acid), polycarbonates, polyester% phenoxy 11i1 polyvinyl acetate, Insulating resins such as acrylic resin, polyacrylamide 41h@, polyamide, polyvinylpyridine, cellulose resin, urethane resin, casein, polyvinyl alcohol, polyvinylpyrrolidone, etc.
I can get angry. 4 types of fat with Kt in the electrogenic layer are:
Suitable is 801kk% or less, preferably 40Ikk% or less. -The bath additives used in the process include alcohols such as methanol, ethanol, and isopropanol;
Acetone, methyl ethyl ketone, cyclohex! Ketones such as non-L'-dimethylformide%, N-
ides such as dimethylacetamide, sulfoxides such as dimethyl sulfoxide, ethers such as tetrahydrofuran, dioxane, ethylene glycol methyl ether, % methyl acetate, esters such as ethyl chloride, methylene chloride, dichloroethylene, Aliphatic halogenated water groups such as carbon tetrachloride and trichloroethylene, or aromatics such as pensene, toluene, xylene, ligroin, monochlorobenzene and dichlorobenzene can be used. Coating methods include dip coating, spray coating, spinner coating, bead coating,
Coating methods such as Meyer bar coating, blade coating, roller coating, and curtain coating can be used for the charge generation layer.K in order to obtain sufficient absorbance. I have as many of the above-mentioned optical equipment as possible. □□' 1 In addition, in order to efficiently inject the generated electric charge and charge into the shaft feeder, it is recommended to use a thin tube with a thickness of 5 microns or less, preferably α01 microns to 1 microns. It is preferable to form a layer.This means that most of the incident light i is absorbed by the electron generator, generating many charge carriers.Furthermore, the generated charge carriers can be recombined or This is attributable to the fact that it is necessary to inject into the charge transport layer without being deactivated from the trap K. Due to this spear-and-bite structure of the charge generation layer and the charge axis transport layer, The photosensitive layer is provided on the substrate having the conductive layer.
Examples of substrates having porosity include those in which the substrate itself is conductive, such as aluminum 1=um, aluminum 1=um base metal, copper% zinc,
Stainless steel, vanadium, molybdenum, chromium, titanium, nickel, indium, gold and platinum can be used, as well as aluminum alloys, aluminum alloys, indium oxide-indium oxide-tin oxide alloys, etc. Plastics (such as H1 polyethylene, hollybrobylene,
polyvinyl chloride, polyethylene terephthalate, acrylic resin, polyfluoroethylene, etc.), conductive particles
・A substrate in which carbon black, particles, etc.) is coated on a plastic with a strong binder, a substrate in which a plastic inner paper is impregnated with conductive particles, a plastic with a conductive polymer, etc. can be used. . A barrier between the conductive layer and the photoluminescent layer! h111! and contact I
JI/I & Noh 4 sublayers

[Can also be provided. Subscript 4 contains casein, polyvinyl alcohol, nitrocellulose, ethylene-acrylic acid copolymer, polyamide (
It can be formed from nylon 6, nylon 66, nylon 610, copolymerized nylon, alkoxy dimethylated nylon, etc.), polyurethane, seratin, aluminum oxide, etc. JIIllIIIA of the undercoat layer is α1 (chron to 5 (chron, preferably a5 ikron to 5 ikron). Toden layer, Kame 4 jr generation increase 1 charge-transmission layer IIIK dove and Tomojima light body t - When dredging, the hydrazonation of Mayuji is carried out by the positive charge, so there is a need to charge the electricity negatively, and when the Teikame is removed, the exposed part Then, holes generated in the charge generation layer are injected into the charge transfer layer.
After that, the surface potential is neutralized and the surface potential is attenuated. Electrostatic contrast occurs at +4
Contrary to the case where Fi electron transport W* is used during C imaging, it is necessary to use a positive direction toner tube. On the other side of Zhengmei's body, Zhengmei's disazo-kei, U.S.%IPFM No. 5554745, 1tlJ Collection 35
67438, No. 4M3586500, etc., biryllium dyes, thiapyrylium dyes, selenapyrylium dyes, and benzobyrylium strips. IjA family dyes and dyes that exhibit photoconductivity of 1, such as benzothiapyryllium dyes, naphthopyryllium dyes, and naphthopyryllium dyes, can also be used as sensitizers. In addition, on the body side, US Ti Patent No. 3,684,502
It is also possible to use as a sensitizer a eutectic axis of a biryllium dye and an electrically insulating electrical combination of alkylidene diarylref 61'1 mint-1 as disclosed in the above publication. This eutectic axis is, for example, 4-[4-bis-(2-/loloether)ahanophenyl J -2,6-siphenyltheapyrylium perchlorate and bor) (4@4'-isobropylidene diphenyl ν carbonate) to halogenated mosquito repellent Mizuki-based ageing agent (Y; Ege, dichloromethane, chloroform, tetrachloride's 1-1-dichloroethane, 1,2-dichloroethane 51s1e2-)! J dichloroethane chlorobenzene, bromobenzene, 1,2-dichloroenceno) K
By adding 1 L of a non-polar solvent (1 dF san, octane, deca 7% 2.2.4-trimethylbenzene, ligroin) to 1 L of the solution, it was expanded as a particulate eutectic. Ranro. The electrophotographic photoreceptor in this specific example includes styrene-butadiene copolymer, silicone resin-
Vinyl materials, polyvinylidene-acrylonitrile copolymers, styrene-acrylonitrile copolymers, vinyl acetate vinyl copolymers, polyvinyl pteral, polymethyl methacrylate, poly-N-butyl methacrylate, polyesters, cellulose esters, etc. t+ can be used as a thickening agent. A laser printer that can be used only for the light body and the electron beam. It can be widely used for electrophotographic applications such as CRT printers and electrophotographic engraving systems. According to Honjimei, by providing a high-sensitivity electrophotographic photoreceptor, e% tycmv return charging and The cut-off potential and the partial potential during exposure are small, and the photo-
I am able to write and write memory ++ on impulse. Below, one row is furrowed according to the e-cutting example. Example 1 Toin Ink I# (a) P-type phthalocyanine (
Product QJLiOnr+l Blue NOB Tone
r) edited in water, tethanol and benzene;
I received a compliment and received a compliment of 7? ;Product name: Hollyester Dohesive 49,000 (Hard Carving 2) manufactured by DuPont
0%) J 1ar; toluene 55v; dioquinane 35f
A liquid solution was prepared by mixing in a tube and dispersing for 64 hours in a ball oil. A charge generation I* was created by applying the dry M4 thickness to α5 microns on the Maruko Al(Nium sheet). Meeting 7
t and polycarbonate crude fat (produced by Borrowing & (a), trade name "Panlite 1s00J") 79 in a mixed solvent of tetrahydrofuran sst and chlorobenzene 55f (Dr11). A 14-wide electrophotographic photoreceptor consisting of a two-layer structure was prepared by using a Mayer Parr on top of the third shock-generating pigeon so that the drying temperature was 111 times. Kawaguchi Electric (a)
H electrostatic copying paper test equipment 91 MO4el BF-428
Using a static method, the corona electric current was applied at 15 KV, and the monkey was held in the dark for 10 seconds.The monkey was exposed to light at an illuminance of 5 tux and the charging temperature was determined. Teiden characteristics are 1 surface potential (vl) and 1 second tW1
The amount of light applied (IC'A) required for attenuation is added to the potential (Vl) t Vx when alt is attenuated by -1. This result is then 7J': Completed vo-580 volts, ■, = 545 volts] Team xi
5. Q jux, ++ecFurthermore, one photoconductor t--5, 6th section V cof emperor created in this example in order to add 11 hooks wJ of the light potential and dark potential during repeated use. 1L version @ 15 tux, aeo (Dm original light character system, 3jt**, & photographic charging, static eliminating lightless optical system and cleaner was pasted on the cylinder of 7t [child photo anger 4 track. As the cylinder is driven, l is gradually printed on the transfer paper.
The 1kl statue is composed of a dog and a dog. Using this analogy, the initial light potential (Vt, ) and dark potential (VD), and the light potential (VL) and dark potential (VD) after applying 5ooohtt were added together. This result is then applied to Bore Actual Examples 2 to 12. In each of these Actual #11 Examples, ψI + is shown in place of Exemplary Compound (1) as the electric current 111*h used in Example 1. Compound 111m (21, (3), (41, (5)
, (61% (7), (83% (91, (10)%
Examples 1 and 1 except that (11) and (12) were used.
An electrophotographic photoreceptor was prepared using the same method. The electron density of each photoreceptor was added to il+ in the same manner as in Example 1. The results of this n are shown below. 2 6.5 580 54O55,65
90550 45,5600560 55,9610555 645580545 7al 600 550 8 Melon 6 570 5409
ao 580 550
, ′□ 10 5.4 580 54011
5.0 570 54012
5.8 600 560
Durability test result 2 570 40 550 603
590 50 580 604 590
30 570 505 580
50 580 606 570 41)
560 507 580 60
590 708 560 40 5
40 509 570 30 560
5010 580 50 580 6
011 560 40! b40
5012 610 50 590
60 actual fabric 1 liter 15 4-(4-dimetelainophenyl)-2,6-diphenylthiavirylium barchlorate 5t and the starvation hydrazone compound (1) 5t were added to polyester (Polynyster Adobe Jib 49000 Duhon Co., Ltd.) ) of toluene (50)-dioxane (50) rbllll 00ag
Kfi was combined and dispersed for 6 hours.The dispersion was spread on an aluminum sheet using a Mayer bar so that the thickness of each rhinoceros after drying was 15 μm. Electrophotography of the next photoconductor
The acid concentration was determined in the same manner as 111. The results are shown below. V0 knee 560 volts ■ t knee 520 volts KH: +a4 Lux, eea Initial potential VD knee 550 volts VL knee 40 volts 50001 Endurance monkey potential VD knee 530 volts VL knee 55 Volt actual - Example 14 Al (4IL upper Nicaszein ammonia Mizushima Yu (casein 11.2t% 28% ammonia water Its water 222ad
) was mixed with a Meyer bar to form noodle cloth IIL with a % expansion thickness of 1 (Cron's immersion layer tube). After dispersing 2 tons with the liquid in ethanol 95-1, the first layer was made to form a charge-generating layer with a density of 14 microns after drying, and then the hydrazone of Gin 11 ψ 1 H was added. A solution of the compound <2Itst and poly-4,41-dioxydiphenyl-2,2''-propane carbonate (forming average molecular weight 1000) in srt dichloromethano 150%; An electrophotographic photoreceptor was prepared by increasing the charge transport with a film thickness of 11 microns. This result is then 4(su. vo knee 610 volts v1 knee 570 volts 1 fear ?+4.8jux, oe. Initial potential Vo knee 590 volts VL knee 3 O volts 5000 IIl! 1 Endurance potential VD knee 570 volts vL! -40 volt real 1hH15 molybdenum plate (substrate) on α2■ with a clean surface
t goo - 1 added to the fixed position in the discharge distillation cypress・Next I/c
Ilk#P3 was evacuated and made into a vacuum (approximately 5X10-4torf). Then, the input voltage of the heater was increased and the molybdenum temperature was stabilized at 150℃. i1%) into the shaft, and the amount of gas #1E and #disintegration tank main pulp t+S
Then, the #4 coil 4C5Mm (high frequency power of dust) was introduced and a glow discharge was generated inside the coil, which was used as the input power of sOW. The four-discharge meeting was held under lb1 conditions until the tube growth reached 2#, and the heating heater and high-frequency electric current were turned off, and the meeting was held until J&Lmmm reached 100°C. After that, close the pulp of swimming gas and silane gas once inside.
to”'torr or less K t, 7 is returned to the atmospheric ratio N
, I took out the board, and then this screen was removed.
A charge transport layer was formed on top of the 4sl in exactly the same manner as in the 4sl.The photoreceptor thus assembled was installed in a borrowed light experiment and charged with =sat Teiden at e 6 xv. The light book was irradiated. Mitsuso uses a tungsten wrap light source for transmission tIi!
I passed the test chart and fired the wax. Then - charged bridge agents (toner and carrier)
By cascading ttm) onto the photoreceptor surface Wi, a good toner image was formed on the photoreceptor surface. Example 16 4-(4-dimetelainophenyl)-2,4-diphenylthiapyrylium barchlorate 5f and poly(4,
4'-isopropylidene diphenylene carbonate>S
After sufficiently dissolving t in dichloromethane 200°C, 100°C toluene was added to precipitate the eutectic body. This ff
After separating the + rock, add dichloromethane to dissolve P+, then add 17100 dP to n- to the same lead plate to obtain 1 liter of eutectic precipitate. A solution of 95 dK7JD was added to methanol containing 2 ft of butyral and dispersed for 6 hours using a ball.This dispersion was poured onto a plate of alkaline resin to form a casein layer. Then, on this charge generation layer, a coating I similar to the transfer layer used in Example 1 of Actual #61 was formed.The thus prepared photoreceptor The electrophotographic percentage was determined by the same method as in Example 1.The results are shown below. VO knee 590 volts V, knee 560 volts m, 6: +A91ux, esc initial position YD knee 580 volts VL knee 20 Volts soootgI* by Kushu VD knee 570 Volts VL knee 30 Volts - Example 17 The eutectic complex broken in Example 16: Hanbu's 5V and the hydrazone compound (10 ) of Set polyester (Polyester Adhesive 49000: Debon Company K) 1/) Tetrahuman Q Turan [150-] was added and thoroughly mixed and stirred. -4 was wrapped in 15 (kun to nai o). The electronic photoconductor A%t!E was made 11'it in the same manner as the real #!1irV1. Vo knee 560 volts Vt '-550 volts J4.: 4r5.5 Lux, a*a first le J turtle position Vo knee 560 holt V4 knee 40 volt 5000 times Funakusaru potential VD knee 540 volts V4 knee 55 volt hour needle out wrinkle person Canon Co., Ltd. Bencher Yu Kano

Claims (1)

[Claims] The following - hydrazone compound represented by formula (1) -! An electrophotographic photoreceptor that has a 30% capacity. In the formula, R1e'2 *J and R4 represent a hydrogen atom or a halogen atom, at least one of which is a halogen atom, and r<5 is a hydrogen atom, an alkyl group, or an alkyl group.
t-%R6 and R7 are an alkyl group, an aralkyl group, a phenyl group, or a MyA atom, which may have an atomic value.
Forming C5-6 member destruction'l! & indicates group・