JPS60256149A - Electrophotographic material - Google Patents

Abstract

PURPOSE:To improve electrophotographic characteristics, especially, ozone resistance and humidity resistance by microencapsulating a phthalocyanine type photocnductor with a resin together with a sensitizer and dispersing the microcapsules into a binder resin to form a photoconductive layer. CONSTITUTION:The photoconductive layer is formed by microencapsulating phthalocyanine type photoconductor powder 1 using an electron donative resin 5 together with a sensitizer 4 and dispersing the microcapsules 5 into a binder resin 3. Such a microcapsule may be prepared by coating the surface of a photoconductive powder 1 with a layer contg. the sensitizer 4 and covering this outer circumference with the microcapsule resin 5, or by coating the surface with the resin 5 contg. the sensitizer 4 dispersed into it. The coating material for forming a photoconductive layer having dispersed such a microencapsulated phthalocyanine type photoconductor powder is low in viscosity, good in fluidity and storage stability, and free from agglomeration tendency, and the obtained electrophotographic material has excellent in characteristics, such as photosensitivity, repetition durability, humidity resistance, and printing resistance.

Description

[Detailed description of the invention]

Industrial Application Field The present invention relates to an electrophotographic material, 1.1, a leading conductive material ηf
The present invention relates to an improvement in a photoconductor having a photosensitive layer basically formed by dispersing it in a &11 adhesive made of an insulating polymeric material. Conventionally, in electrophotography, the surface of the photosensitive layer of a photoreceptor is charged and exposed to form an electrostatic latent image, which is developed with a developer to make it visible, and the visual image is created. Either directly place the image on the photoreceptor 1. with a fixed 1" i, or transfer the image onto the photoreceptor 1. There is a method based on the so-called I'l'C force formula, in which a 110-view image of 110 is transferred onto a rolling paper such as paper, and the rolled Q-image is placed over a constant Xr distance I to obtain a composite image. . Conventional 1: To form a sensitive layer for electrophotography used for the following purposes, 'L conductive +1 material 11' was used as 'C' amorphous selenium, cadmium sulfide or oxidizing layer. Lead is commonly used, or amorphous selenium requires an electrically conductive support, vaporized Xi, and is difficult to manufacture.
f It has no flexibility, and is strong in Atmospheres, requiring careful handling and being expensive. , 1. tree 1
(1r, the sensitivity depends on the ratio) 1. Therefore, in order to obtain practical sensitivity, the proportion of binding agent must be reduced, and as a result,
If flexibility, IL slipperiness, hardness, and abrasion resistance are low mechanical strength, corona (i. Deterioration of characteristics [lack of being]
1. ', i: Somehow, due to the At nature, there was a problem with hygiene, such as the risk of environmental Z staining. In order to solve these shortcomings and problems, various research and developments have been carried out,
For example, JP-A-5F+-38543, JP-A-51!35852, JP-A-5: (64, (
14 (1 Publication, Japanese Patent Application Laid-Open No. 1983-14-837, i4), etc., a photoreceptor using a phthalocyanine-based photoconductive +!1 material has been disclosed. This type of photoreceptor is It is known that it is excellent in terms of J5 and sensitivity, has no hygiene problems, and exhibits high sensitivity even with long wavelength lasers such as conductor lasers. Phthalocyanine In the case of a photosensitive layer formed by dispersing a photoconductive material powder in a binder on a substrate 1-1, the hydration I
A large amount of I' ions ((If 20) ritl'') were generated, which caused the problem of poor moisture resistance.
The surface of the photoreceptor is oxidized by ozone and nitrogen oxides, and the oxides are decomposed by moisture in the air. As a result, a problem arose in that the molecular weight was reduced and the surface charge retention property was decreased. As a temporary measure, it has been proposed to add anti-oxidant to the photosensitive layer or provide a surface protective layer with ozone resistance (fat), but it is difficult to put it into practical use due to poor sensitivity and other problems. In addition, as shown in Reference I11 in Japanese Patent Application Laid-Open No. 544137, a photoconductive NT9 pigment (1), for example, a phthalocyanine, is coated with a resin coating agent (2). Contain I agent O
(One method has been proposed to prevent fatigue due to repeated use of the body by dispersing it in fat (3). Mere resin coating is generally sufficient in terms of resistance j! The purpose was to improve ozone +1 and moisture resistance in electrophotographic materials using phthalocyanine-based photoconductive materials, especially without reducing sensitivity. Structure 3 of the Invention The present invention provides photoconductive materials, especially phthalonanine, which are microencapsulated with photoconductive materials together with sensitizers, especially with electron-bearing υ1 fats. I-, the binder (j1
By dispersing it in oil, the durability, ozone resistance, and moisture resistance of the photoreceptor are further improved without impairing the sensitivity. That is, the present invention provides an electron 'I' having a photoconductive layer formed by dispersing phthalocyanine-based photoconductive material powder in a binder resin.
g True Materials relates to an electrophotographic material 11 characterized in that the russiaene-based photoconductive material powder described in A:i is microencapsulated with a resin together with a sensitizer. The electronic material of the present invention will be explained with reference to FIGS. 1 and 2. FIG.
) and its outer periphery for microencapsulation 81
Are microcapsules coated with fat (5) used as a binder? , 4
(This is a schematic cross-sectional view of an electrophotographic material obtained by dispersing it in fat (3) and bonding it to a conductive substrate (for example, an aluminum plate) (6). 4- FIG. The surface of the photoconductive material powder (1) is coated with a sensitizer (4).
) is dispersed in microcapsules coated with 01 fat (5) for microencapsulation, which is dispersed in binder fil (fat (3)) and bound to a conductive substrate (6) l-. 2 is a schematic cross-sectional view. Of course, the embodiments shown in section 1 and FIG. 2 are typical examples of the present invention. However, other embodiments may also be used, for example, a sensitizer (4) may be further dispersed in the microencapsulation resin (5) of FIG. may be coated with a resin for microencapsulation.The resin for microencapsulation used in the present invention may be an electron-donating resin such as an acrylic resin, a silicone resin, a urethane resin, a polyester resin, Polyamide O (fat, melamine resin 4 fat, polybutanoene resin, polystyrene O (fat, etc.) are preferred, and acrylic O (fat, urethane resin, polyester O (fat, melamine resin) are particularly preferred. As a sensitizer used in the present invention is a polycyclic or heterocyclic nitro compound such as trinitroanthracene, 2.4.7-dolinitrofluorenone, acid anhydrides such as phthalic anhydride and trimellidic anhydride, quinones such as anthraquinone, tetramethyl-1)- Examples include aromatic amines such as phenylenenoamine; nitrile compounds such as tetracyanoethylene; pyrazoline compounds; Good. R, R. 1 / A+0=N-N ) n l I l \ l in 3 In formula 1, ) (1 is hydrogen or methyl group, R, and 1
, is an alkyl group, an aralkyl group or an aryl group which may have a substituent, t\ is an aromatic hydrocarbon group which may have a substituent, or an aromatic heterocyclic group, and 11 is 1 or 2 Represents a numerical value. R, and R3 may be combined to form a ring. 1 This hydrazone compound is described, for example, in JP-A-5-1-35.
(This is described in I28, Japanese Unexamined Patent Publication No. 55-4676 f1, etc.) Is it possible to use the immersion method to microcapsule photoconductive materials? It is preferable to use the coacervation method or the in-situ polymerization method.In the coacervation method, a 7T0/anine-based electrically conductive material powder is added to a microencapsulation O (fat solution) and mixed with the solvent of the resin solution. The solubility of the resin in the solution can be lowered by adding a solvent that does not dissolve the resin, or by evaporating only the solvent described in 11j.
・Depositing 441 fat on the surface of the 7-cyanine-based photoconductive key material powder: This is the process. In addition, when using the in-situ polymerization method, a 7-trironanine-based leading conductive material powder is added to a solution of the Iij polymer or prepolymer of the resin, and the i+:i tit polymer or prepolymer is polymerized. The photoconductor powder can be deposited directly on the surface of the photoconductor powder. In this in situ polymerization method, lij! ′
i1゜7- Coacervation method, heating,
It is possible to perform stirring, etc., and it is also possible to add a polymerization catalyst.

[It's Noh. The old method for adding a sensitizer is to add a 7-day-long ion-based photoconductive powder to a sensitizer solution, stir it, separate it, and then dry it, or evaporate the solvent and adsorb the sensitizer. There are two methods: a method of mixing a sensitizer and a 7-trironanine-based photoconductive powder, heating the mixture to a temperature above the melting point of the sensitizer, and adsorbing the sensitizer. Any of these methods may be used. The thickness of the prepared microcapsule coating layer is 5 to 1μIl+
It is particularly preferable that the amount is 10 to 0.5 μmo. The photoreceptor of the present invention is prepared by mixing and dispersing the microencapsulated photoconductive material in a binder (k) with a solvent to prepare a photosensitive coating solution as described in 1. Intermediate layer-1 formed directly on or on the sexual base-1-
- and then dried, followed by heat treatment to form a photosensitive layer. 81 The amount of 04 fat for microencapsulation used in the present invention is 0.5 to 5 (I small i?i,%
, preferably 1 to 30% by weight. The sensitizer is phthalocyanine ('), i~30% by weight. In addition, when the mixing ratio of the phthalocyanine-based photoconductive material and the Xi agent resin is 1, the sensitivity increases as the former acid increases.
1, but the dark decay increases significantly, making it difficult to retain the charge, making it less practical.Conversely, if the former amount decreases, it becomes 11Δ; it becomes less scary, but the sensitivity decreases. , the amount of photoconductive +1 material is Il+'j; n-agent resin 1
0 (5 to 100 parts by weight per 1 part by weight, preferably 10 to 60 parts by weight). In the present invention, if desired, an antioxidant may be used together with the sensitizer. Good.The antioxidant is microencapsulated in the same manner as the sensitizer.Of course, it may also be used by blending it into the encapsulating resin.
Although various known chemical compounds can be used, hindered 7-el/-based oxidized μIJ11 is particularly effective. Sensitized Ai, acid IL protection 1j'JJ is used for Inno 1, 18-1 ozone + 1.64 Il
1) It is possible to improve the repeated sensitivity change. As the 7-cyanine-based light used in the present invention, any of Shiraki's well-known 7-cyanine and its derivatives 414. can be used as the conductive agent. Aluminum phthalocyanine, beryllin,
7 thalocyanine, magnezi 1 mphthalocyanine, calcilyl, 7 talocyanine, 1 lead 7 dironanine, galiuno, phthalonanine, katomiu 15 phthalocyanine,
Innonum 7 talocyanine, Lanthanum 7 thalocyanine, → Nomarium phthalocyanine, Colopiu 15 phthalocyanine, Nopronum 7 Yuguchi cyanine, Inworiu A7 Talonanine, Ruthenin 13] 9 [J/anine,! +17 talonanine, Hananouno, phthalocyanine, soot 7 thalocyanine, zatan 7 thalocyanine, lead phthalocyanine], thorium phthalocyanine, uranium 7 thalocyanine, manganese 7 lyronanine, iron phthalocyanine, kohar) 7 thalocyanine, ninoral 7 thalocyanine/,
[Junum 7 thalocyanine, 2 roses 15 phthalo/a;
/, Hananol 7 Talon Anin, Platinum 7 Talon/Ani/,
It is the metal 7ri IJ/Aan of the antimony 7ri Ronanin inn. Furthermore, instead of the metal wire r, the central core of the phthalocyanine may be a hydrogenated metal having a valence of S (a valence or higher). Copper-1-A: 77-ronanine, iron polyherophthalo/7-nin, -2-baltohexa-71-nilphthalon-agon, tetra-azo-7-yugucyanine, tetramewor-7-ri U/anine, 2-alkyl amide-7 phthalocyanine, etc. Metals, metal-free phthalo/anine derivatives, etc. are suitable, and these can be used in combination.
. In addition, the hydrogen atom of the benzene nucleus in the phthalocyanine molecule is a diFro group, /ano), 1, halogen radical r, sulfono,
(J9, υ゛carboxyl J, l, in the main r attraction + tI group, jl1
The converted phthalo/anine-conducting compound and the phthalocyanine compound are combined with the 7-thalonanine compound.
at least one species of I-substituted phthalocyanine compound;
1- It is also possible to use phthalocyanine compounds obtained by mixing with inorganic acids that can form salts with them and precipitating them with water or bases. . In this case, the electric j'-attracting group-substituted phthalocyanine derivative tree can be used - the numerical force of the substituents in the molecule - 10 11-moat trees, and the electric r-attracting + I group-substituted phthalocyanine derivative and other JI! The composition ratio with the ff-converted 7-talocyanine compound is the former ヱ1-converted) 1 (the number of phthalocyanines in the composition is
per TL, full・2 pieces, preferably 1, TL, 1H
12 to 1 1: Naru U 1 Ko 4 Ruka kF j: l-
stomach. Examples of inorganic acids that form salts with the 7 thalocyanine compounds used in the production of the first phthalocyanine-based photoconductive material include sulfuric acid, or-1-phosphoric acid, chlorosulfonic acid, hydrochloric acid, Hydroiodic acid, 72-hydrohydric acid, and dihydrogen acid cost 1 yen or ¥11. The above-mentioned electrical conductivity + J mouth (among the above, particularly suitable for achieving the purpose of the present invention), metal-free phthalocyanine, copper phthalocyanine and its derivatives, for example,
Inuhiki + IJ, (substituted derivatives can be opened. 121 J9 electrical insulation + '1 binder in the present invention?47 Greasy is electrical insulation +1 binder known per se as electrical insulation +1
(Moon resin, thermosetting resin, photocuring resin, photoconductive f1 resin, etc. can be used. Examples of suitable binder resins include 5, but are not limited to these. Saturated polyethral resin, polyamide resin, acrylic resin, ethylene-acid-resistant acetylene copolymer, ionically crosslinked olefin copolymer (Iinomer), styrene-phthanonine flock copolymer, polycarbonate, hinyl chloride-acid-resistant hinyl copolymer Small coalescence, cellulose nisful, Boliimitoto 1 thermoplastic + 1 bonding agent 411) I'acrylic heat-cured f-th, +1 year old "I agent j; bi-cured f-th n fat; poly N-vinylcarbasol, polyhinylbyrene, polyvinylanthracene light W-b: +
1 resin. These electrical insulation +1 resins are 1 x 10 as measured by JIT.
14 Ω. 7δ1 is not used [2 is the machine in the shape of a notebook or ``'7), or - these are the public sources, plus the sankufil! 15, or the first time in history.
In Part 4!1, the present invention;
Effects of the Invention The microencapsulated conductive layer of the present invention may be laminated with a conductive layer of the same material.
l effect” 1 cut 1411 fingers and ]((: When converted to 11,
Coating #l $-i melon has a low 11% viscosity f1 with a small V tendency or small, etc., showing good tightening and dynamic +1, and in addition, J1 cohesion +1, so it is 1 less than 1 to 41 for the retention stability. , or ') This photoconductive fl village 11 has an electric current r°su° true 41
t is a good electric power f'', which has an intrinsic value of +1, and is rated at 1 month for sensitivity, repeatability, moisture resistance, printing durability, etc. Excellent characteristics in a small size. Hereinafter, the present invention will be specifically explained using Examples 1.
-ru. Example 1 ε non-type 4 phthalonanine 1 () small 1! ) part and +1-
;') Ethylaminobe/saldehydone phenyl) 7
Son I ITI'+' 6 parts methyl enal ketone l 1
1-T+'+ii part; Bi-dispersed, evaporated mesal ethyl chloride, tasted, and sensitized to obtain 4 phthalocyanine. 11th iI
Part i contains silicone resin (Kllll: i1,
Co., Ltd.) o, 5, part j, and ^1 acid J-chirun fl.
Add 6 parts of IT and +6 parts of J1m agent (manufactured by Isobar Co., Ltd.) to It over 1 hour while stirring. It was vacuum-dried for 1 hour at + o o 'C and coated with 71gawa resin.
: 1st part, 3111 effects of Dorikahone (Panrai + 1)
M ((Hl knee hanging), made by Kasei (Match)), 'f!-
i1'i! ,, some flit for Polynismil (byron 2 fl (1: east,) manufactured by )bo (machine)) 11 out of 50
; Part j; i 1. 'i4-works power Ruhasoru; (
-Arteshi)・Mesylphenirhi)・Razon,” r f
lITI! 15- Run: In addition to toluene (!I:l) as a polymerization solvent, knead it using a 'ζ hole mill and mix it with 'Otji conductive + I coating'. Painted book 1 and 2 made by II
Aluminum, J, (1 to 1') 1,'+
A sensitizer was prepared by applying 41 coats so that the color was II m. Example 2 ε helicopper phthalocyanine 1 () Kosaibe, II-noethylaminopenpenthaldehy F no 7 gonyl hydrazone 1 heavy 11
1 part and oxidation 11)j 11 agent (Irganox 10
F6: - F manufactured by Vagine 1) ('1.5 small parts were dispersed with 10 small I11 parts of methyl ethyl ratone, dried to release 1 part of methyl ether, and sensitizer J3 and antioxidant. The W4 conductor powder was coated with a resin using the same method as in Example 1, and a susceptor was manufactured. Example: (ε type 1) (7-Russian: N Ill + 7B + part, N-Yuworkalhazono L-: (-Altehydonphenylhydrazone 211 ti' 1 part and oxidized IJj tl agent (Irga 7 Nox", + IE 5: 1 power A-
+1 made) tl, 5 small parts i tiger 11 1 no 1 7 run 1
0 Φ instep (bidispersion law, dryness -υ = 16 - evaporate Lahitor 7 Ran, add oxidation preventive 11 as a thickener) :i
r. , - Photoconductor powder 10 parts I, J part J BoA 7 January fat (
Ehikun I fl, ”+ fl: Fire 11 11
(b) made by (). Triple 1. :1 part and 2 fl :Ti! Add the li part to 1° and stir for 1 hour.
``Musky ÷ n smoke: I covered Ebon A with the moon effect. Thus A: 1'L conductive f port 4 ++ 1 r,
lTi! 1 part, polycarbonate resin (Panlite K I + (fl 11) j (5 parts 11 + parts), polyester (sealing (high (1-200)) 50 small L 1 part, N
-Eworkarhasol-:)-Altehydemethylphenylhydrazo/, "In Iil!!:, Bljh 11
11 Then, as a solvent, add 1) Ufuran: 1 luene (9: 1) Jf mixture ^]] and use whole milk, 1)) time, and then, Eyes・）゛NE1
1. ', l [2, -'s 4-I[ was applied to the aluminum panom group 1 1: 2 'J l, ''Iu II: 2 to give a stiffness tI4-11. Comparative Example 1 ε1- Lit117 Rironanin I,”+ITI:
1': Part, Polycarbonate 4, Nate (Panlite K
I 3fl i)) 3,'s heavy axillary part, polyester resin (Vylon 200) 50 parts V part I; (9:l) If added to the solvent using a whole mill for 18 hours i! Knead to prepare photoconductive coating I [1,
A photoreceptor was prepared by applying the coating material No. 2 to an aluminum substrate 1- to a thickness of about 15 μm. Comparative Example 2 Panlite K1300) 1.2 parts in 5 layers
- Dichloref 250 weight and 111 parts were dispersed. Next, 10 parts of 1,2-nochloroethane was added to dilute the mixture, and 11-hexane was gradually added without stirring.
The precipitated fine particles were filtered, separated, and dried to obtain phthalocyanine whose surface was coated with polycarbonate. The obtained photoconductive bar material i'l l 5-layer ht part, polycarbonate (sister finger (Panlight K I, '(f) fl
): (5 layers, polyester resin (Vylon 2 (
1(1), 50 subregions, N-ethylcarbazole-3
-aldehyde-methylphenylhydrazone 5F1'i
rI residue with tetrahydro7ran: toluene (9:l)
of (111 cups), and using a ball mill, add 48
A photoconductive paint was prepared by kneading for 1 hour, and the paint was applied to an aluminum substrate 1 to a thickness of 15 μm to produce a photoreceptor. Example 4 Copper phthalocyanine 50 weight 1 Kebe and Te) Lanitro Steel 7 Talonanine 0.2 heavy weight part was dissolved in (8% concentrated sulfuric acid; (()C) volume part without stirring for 1 minute.The dissolved liquid was dissolved in water 30G. A composition of copper phthalonanine and tetranitro steel phthalonanine was precipitated in an O-heavy tank.Then, the composition was filtered, washed with water, and dried under reduced pressure at 20°C. In the acid part, 2 parts by weight of 1)-phenylamine-7benzaldehydonophenylhydrazone was dispersed together with 1 part by weight of tetrahydro-7rane, and the mixture was dried to evaporate the tetrahydrofuran to obtain a phthalocyanine with a hydrazone compound adsorbed thereon. 19- 1 part by weight of the obtained photoconductive powder was mixed with 215 parts of methyl ethyl ketone heavy oil and Isopar 11 (manufactured by Konso Kagaku (1)).
fl9. ' + Weight is dispersed in a mixed solvent with 8 parts of acrylic polyol (Acrydic A (18:11
2 parts by weight of 2 parts by weight of 5 fl (manufactured by Hon Ink Co., Ltd.) and 0.1 parts by weight and 1' part of incyanate compound (5 fl: 1 inch, manufactured by Hon Ink Co., Ltd.) were added. After dispersing for 1 hour, methyl ethyl ketone was gradually evaporated at room temperature using a rotary evaporator connected to an aspirator to deposit acrylic polyol and incyanate on the surface of 7-talonanine, and then heated at 00°C for 3 hours. By processing, a phthalocyanine coated with urethane (1 resin) was obtained. 15 parts by weight of the obtained phthalocyanine material, a thermosetting acrylic resin (Acrydic A405: 11 inks)
I
A mixed solvent of 20 parts by weight of I-noethylaminobenzaldehydonophenylhydrazone f; Approximately 10% of Shiko's paint is applied onto an aluminum substrate.
A photoreceptor was prepared by coating the film so that μ[n]. Example 5 - Parts by weight of the composition 5() obtained in Example 4 were mixed with 5 parts by weight of 1]-noethylamine/benzaldehydonophenylhydrazone, and the hydrazone was heated at +5 (1'C) for 30 minutes. The phthalocyanine adsorbed with the sensitizer was dissolved in 10 parts of phthalocyanine and 5 parts of toluene.
(1 to 3 parts were added and dispersed. To this, 10 parts by weight of toluene was added to dilute it, stirred with a homomixer, and n-hexane was gradually added, and a powder precipitated as fine particles. After filtration, separation and drying, a phthalocyanine coated with polystyrene was obtained. 15 tons of the obtained 7 talonanine was mixed with heat-sandable acrylic resin (II R62 (1: made by Hishi Rayon). ) 2 and) small portion, melamine cedar 1 fat (Yuhan 2 fl
IIS: Getto (manufactured by 1 Co., Ltd.) 7 cities, 1)-noethylaminobenzaldehyde 2 phenylhydrazone 2 ()
and a 1/1 mixture of methyl iso-7 tyl ketone: cellosol 7 acetate (N:I) and a ball mill for 48 hours; 1? to prepare a photoconductive paint;
This paint was applied to an aluminum substrate I to a coating thickness of approximately 1()μ+n to produce a photoreceptor. Example 50 parts of the composition obtained in Example 11 were dispersed with 5 parts by weight of 5-so-nitrobenzoic acid and 1 part of 20% methyl ethyl ketone. The sensitizer was adsorbed on 7-lyocyanine. Polyester 4A (Byron 200) heavy axillary part dissolved in 10 parts by weight of ethylene chloride was added to 20 parts by weight of this phthalocyanine and dispersed. This solution While stirring, 11-hexane was gradually added to precipitate fine particles.The resulting powder was filtered, separated, dried and mixed with polyester resin (Vylon 2 (+ (1: Toyobo)). A footed phthalocyanine (manufactured by Co., Ltd.) was obtained.The resulting phthalocyanine material contained 15 parts by weight, 23 parts by weight of heat-sandable acrylic resin, 711 parts by weight of melamine resin, 1 part by weight.
1-Noethylamine 7pensaldehyde diphenylhyde l'
20 parts by weight of Razon and ilX of methyl iso-7 tyl ketone:cellosolve acetate (1:]),? A photoconductive paint was prepared by adding F solvent and kneading for 4) hours using a ball mill, and the second coat was coated on the aluminum substrate to a thickness of approximately 1()μ'0. A photoreceptor was prepared using 15 parts by weight of the composition of copper phthalocyanine/tetranitro copper phthalocyanine mixed 1:1 in Example 4, 28 parts by weight of thermosetting acrylic resin, and 7 parts by weight of melamine resin. ,p-
Using a ball mill, a mixed solvent of noethylaminobenzaldehydonophenylhydrazone 20-fold axillary and methyl iso-7-tyl ketone: cellosolve acetate (III) was mixed for 13 hours to prepare a 23- photoconductive paint. Paint on aluminum base]
- to a thickness of about 10 μm to prepare a photoreceptor. Comparative Example 4 A photoreceptor was produced in exactly the same manner as in Example 4, except that the hydrazone compound was not adsorbed. The obtained photoreceptor was transferred to a commercially available powder image transfer type photoreceptor Igiso (manufactured by Minolta Camera Co., Ltd.: F: P-4507,
) and the surface potential of the photoreceptor immediately after applying +6.5 KV corona discharge to the surface of the photoreceptor ＼'o (V), the decay rate of the surface potential after being left in the dark for 1 second I) 1) I ( 1
(%) and surface potential after exposure or 1/2 of initial surface potential
The amount of exposure required to reduce the amount of light E, /2 (leux・se
e) and 30 +1 fSurface potential\'0 and sensitivity' when repeated charging-exposure-removal operations are performed once]
/2 was measured. The results are shown in Table-1. 24- As is clear from the results of person-1, the effects of the present invention W, I+
However, the sensitivity is low, and the results of the repeatability f1 are even better than those of the comparative examples. Unusual special +1 yen charge.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are cross-sectional views of the first embodiment of the electrophotography according to the present invention. In the figure, (1) is photoconductive +r$4ne1, (j () is stone cutting fat, (・1) is sensitizer, (5) is microencapsulation resin and (('i) I The basic one is small [,. Engraving of drawings (no change in content 2) Figure 1 Figure 2 27- Procedural amendment (F format) % formula %: ゛) Name of the invention Iguj, ゛ Mountain: r 'su' Sada 11th Thurs) : I iii + E shows "Relationship with 11 cases Applicant 1r to Totoki Place 11' 1130 Antjl 11' 21, Higashi-ku, Osaka City Minolta camera 1'], ceremony month. 1 agent

Claims (1)

[Claims] 1.7 In an electrophotographic material having a photoconductive layer formed by dispersing thalocyanine-based photoconductive material powder in &lI adhesive resin, the phthalocyanine-based photoconductive material powder is mixed with an O (grease) and a sensitizer. 2. The electrophotographic material described in item 1, in which the resin coating layer is a resin (31 resin), is characterized by being encapsulated.