JPS60239760A - Printing original plate for electrophotographic engraving - Google Patents

Abstract

PURPOSE:To obtain a printing original plate having high sensitivity and high printing resistance by providing an electrophotographic sensitive layer consisting of two layers: an electric charge generating layer contg. the azo pigment expressed by formula I and an electric charge transfer layer contg. an electric charge transfer material and alkali soluble resin on a conductive base. CONSTITUTION:The basic constitution of the printing original plate for electrophotographic engraving consists of the electrophotographic sensitive layer 2 formed by laminating the charge generating layer 3 and further the charge transfer layer 4 on the conductive base 1. The reverse lamination of the layer 3 and the layer 4, i.e., the latter on the former, is also possible. The electrophotographic sensitive layer (the charge generating layer and charge transfer layer) in the non-image part which is not masked by a toner image is dissolved away and the hydrophilic surface of the conductive base is exposed so that the image part coated with the lipophilic toner remains on the printing plate obtd. by forming the toner image on the original plate when said printing plate is immersed into an alkaline eluting soln. Thus oil ink sticks only on the image part in ordinary lithographic printing and the good printed matter having no ground stains is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a novel printing plate that can be made by electrophotography. More specifically, in a new printing plate containing a specific azo pigment, an electrostatic latent image obtained by charging and subsequent imagewise exposure is developed with toner, fixed to obtain a toner image, and then a non-image This invention relates to a printing plate that is made by eluting and removing a photosensitive layer.

BACKGROUND ART Conventionally, as master plates for lithographic printing, those using photosensitive resins or silver halide photosensitive materials have been known.

However, although lithographic printing plates using photosensitive resin have high printing durability, they have low sensitivity, so-called direct plate making is not possible, and it is necessary to first transfer the original to a silver halide film to create blemishes or blemishes. Therefore, there are drawbacks such as requiring large-scale equipment and requiring time for plate making.

Further, although printing plates using diffusion transfer development or hardening development methods using silver rodanide photosensitive materials can be directly plate-made, they have the drawbacks of low printing durability and high cost per sheet.

As printing plates for direct plate making using electrophotography, for example, Japanese Patent Publication No. 47-47610, Japanese Patent Publication No. 48-4
0002, Special Publication No. 48-18325, Special Publication No. 51-15
766 and Japanese Patent Publication No. 51-25761 are known printing plates having a zinc oxide-resin dispersion system. After forming a toner image on this printing plate by electrophotography, it is treated with an acidic aqueous solution containing, for example, a ferrocyan salt in order to make the non-image area hydrophilic. Printing plates made in this way peel off due to the mechanical pressure applied during printing and the penetration of dampening water into the photosensitive layer and conductive layer, and the hydrophilic layer on the surface is destroyed. Its printing durability is 5,000 ~
It was about 10,000 sheets.

In addition, zinc oxide/resin dispersion printing plates are dye sensitized in order to have sensitivity to visible light, but even so, they do not exhibit sensitivity sufficient for practical use in the long wavelength light region of 600 nm or more. Therefore, low output and cheap) Ie-Ne
The disadvantage is that exposure cannot be performed using a laser or semiconductor laser.

On the other hand, the special public service No. 37-17162, the special public service No. 38-7758
, JP 46-39'405, JP 52-2437,
JP-A-56-107246, JP-A-55-10525
Similar Japanese Patent Publication No. 55-153948, Japanese Patent Publication No. 55-16125
, JP-A-57-14.7656, JP-A-56-1461
45, JP-A-57-161863, etc., for example, a layer consisting of an organic photoconductive compound and an alkali-soluble resin, or a phthalocyanine on a hydrophilic conductive support such as a grained aluminum plate. A layer in which charge-generating pigments such as pigments are dispersed in alkali-soluble resin,
Alternatively, a printing original plate for electrophotographic engraving is disclosed in which a layer sensitized by adding an electron-withdrawing substance or an electron-donating substance to the dispersed layer is provided. This type of printing original plate is made by forming a toner image on the photosensitive layer using an electrophotographic method, and then eluting and removing the photosensitive layer in the non-image area with an alkaline solution.It is a printing plate with high printing durability using direct platemaking. However, it has the disadvantage that it has low sensitivity as a photoreceptor for electrophotography, resulting in slow plate-making speed and the need to use a high-output light source.

Purpose The purpose of the present invention is to solve the problems of the conventionally known printing original plates for electrophotographic printing as described above, and to solve the problems of the conventional printing original plates for electrophotographic printing, and to Our goal is to provide printing plates with long printing durability.

Structure The printing original plate for electrophotolithography of the present invention comprises a charge generation layer containing an azo pigment represented by the following general formula (1) and a charge transport layer containing a charge transport substance and an alkali-soluble resin on a conductive support. It is characterized by being provided with an electrophotographic photosensitive layer consisting of two layers.

General formula (1) (However, A represents all Kaglar residues.) The basic structure of the printing original plate for electrophotographic engraving of the present invention is shown in the first part.

Here, 1 is a conductive support and 4 is laminated thereon to form an electrophotographic photosensitive layer 2.

The charge generation layer 3 and the charge transport layer 4 are stacked upside down.
It is also possible to write incense writing (inherent!).

As the azo pigment Kagura used for charge generation h3,
For example, compounds with a phenolic hydroxyl group such as phenols and naphthols, aromatic amine compounds with an amine group, aminonaphthols with an amine group and a phenolic hydroxyl group, or aliphatic or aromatic enolic ketone groups (active methylene group) is used,
Preferably, the Cassilla residue A has the following general formula (1),
It is selected from the group represented by side, (v), (b), and 6ton.

[In the formula, R1 is hydrogen, an alkyl group, a phenyl group or a substituted product thereof, X is a hydrocarbon ring or a substituted product thereof, a compound ring or a substituted product thereof, Y is a pure substance (
No change in content j or a substituted product thereof, or a styryl group or a substituted product thereof, R311″1 hydrogen, an alkyl group, a phenyl group,
or a substituted product thereof, or R2 and R
3 may form a ring together with the carbon atom to which they are bonded. )] (R4 in formulas (It) and (5) is substituted or unsubstituted.
) Ar represents a typical hydrocarbon group.

(In the formula, R5 represents an alkyl group, a carbamoyl group, a carboxyl group, or an ester thereof, and Ar1 represents a hydrocarbon C group or a substituent thereof.) 60 (In the hole, R6 is a hydrocarbon group or a substituent thereof, A
r 2 represents a hydrocarbon ring group or a substituted product thereof.

) Hydrocarbon rings for X in the general formula used in the present invention include, for example, benzene rings and naphthalene salts; examples of heterocycles include indole rings, carbazole rings,
Hydrocarbon ring groups such as benzofuran ring for Y or R2 include phenyl group, naphthyl group, anthryl group,
Examples of heterocyclic groups such as pyrenyl group include pyridyl group, chenyl group, furyl group, indolyl group, benzofuranyl group,
Examples of the ring that can be formed by R2 and R3 together with the carbon atoms to which they are bonded include a carbazolyl group, a dibenzofuranyl group, and a fluorene ring.

Furthermore, examples of the hydrocarbon group for R4 or R6 include alkyl groups such as methyl, ethyl, propyl, and butyl, aralkyl groups such as benzyl, aryl groups such as phenyl, and substituted products thereof. R4
Alternatively, substituents on the hydrocarbon group of R6 include alkyl groups such as methyl group, ethyl group, propyl group, butyl group, alkoxy groups such as methoxy group, ethoxy group, propoxy group, butoxy group, chlorine atom, bromine atom, etc. Examples include a halogen atom, a hydroxyl group, and a di-o group. Examples of substituents on the phenyl group of R1 or the ring of X include halogen atoms such as chlorine atoms and bromine atoms, and Y or R
Examples of substituents on the carbocyclic group or heterocyclic group of 2 or the ring formed by R2 and R3 include alkyl groups such as methyl group, ethyl group, propyl group, butyl group,
Alkoxy groups such as methoxy, ethoxy, propoxy and butoxy groups; halogen atoms such as chlorine and bromine; dialkylamine groups such as trimethylamino and diethylamino; noacylkylamino groups such as dibenzylamino; Examples include halomethyl groups such as fluoromethyl groups, nitro groups, cyano groups, carboxyl groups, esters thereof, hydroxyl groups, and sulfonic acid groups (-8o3N&). Further, examples of the hydrocarbon ring group in Ar ``4 or Ar 2 include phenyl group, naphthyl group, etc., and examples of substituents in these groups include alkyl groups such as methyl group, ethyl group, propyl group, butyl group, etc. basis,
Methoxy group, ethoxy group, propoxy group, butoxy group
Examples include any alkoxy group, a nitro group, a halogen atom such as a chlorine atom, a bromine atom, and a dialkylamine group such as a cyano group, a dimethylamino group, and a diethylamino group.

The azo pigment used in the present invention is, for example,
112620 and Japanese Patent Application No. 57-142622. Examples of these azo pigments are as follows.

(Leaving space below) Engraving of the specification (No change to the content l Change the purity of the book I-(No change to the content, y) Book p of the specification (No change to the content L! 19 of the Recommendation Specifications (no change in content) The charge generation layer 3 is a layer mainly composed of an azo pigment represented by the general formula (1). However, it may contain a binder if necessary. In this case, the proportion of the azo pigment in the charge generation layer is preferably on a 30-weight plate. When using a binder, it is preferable to use an alkali-soluble resin such as a styrene-maleic anhydride copolymer or a novolac type phenol resin (described in detail later). It is also possible to use other resins as long as the proportion of the binder is small.Also, the charge generation layer 3 preferably has a thickness of 0.01 to 5 .mu.m, preferably 0.01 to 5 .mu.m.
05-2 μm. If the thickness is less than 0.01 μm, charge generation will not be sufficient, and if it is more than 5 μm, the residual potential will be too high for practical use.

The charge transport layer 4 is formed of an electron transport material and an alkali-soluble resin. Charge transport substances include hole transport substances and electron transport substances, and hole transport substances include, for example, 2
,5-bis(4-noethylaminophenine b)-L3+
4-Oxadiazole, 2,5-bis(:4-(4-diethylaminostyryl)phenyl)-1,3,4-oxadiazole, 2-(9-ethylcarbazolyl-3-
)-5-(4-diethylaminophenyl) -1,3,
oxadiazole compounds such as 4-oxanoazole,
2-vinyl-4-(2-chlorophenyl)-5-, (
Oxazole compounds such as 4-diethylamino)oxazole, 2-(4-noethylaminophenyl)-4-phenyloxazole, 1-phenyl-3-(4-diethylaminostyryl)-5-(4-diethylaminophenyl)pyrazoline, 1 -Phenyl-3-(4-trimethylaminostyryl)-5-(4-dimethylaminophenyl)
Birapurin H pyrazoline compound, 2,2'-tumethyl-4,4'-bis(diethylamino)triphenylmethane, 1,1-bis(4-dibenzylaminophenyl)
diphenylmethane compounds such as glopane and tris(4-diethylaminephenyl)methane; fluorene compounds such as 9-(4-trimethylaminobenzylidene)fluorene and 3-(9-fluorene compound)-9-ethylcalcupur; Styryl anthracene compounds such as 9-(4-diethylaminostyryl)anthracene, 9-bromo-10-(4-diethylaminostyryl)anthracene, 1,2-bis(4-diethylaminostyryl)benzene, ■+2-bis(2,4 -dimethoxystyryl)
Nostyrylbenzene compounds such as benzene, 9-ethylcarbasol-3-aldehyde 1-methyl-1-phenylhydrazone, 9-ethylcarnosol-3-aldehyde 1-bentu-1-phenylhydrazone, 4-noethylaminobenzaldehyde 1 , 1-sophenylhydrazone, 2,4-dimethoxybenzaldehyde 1-benzyl-1-phenylhydrazone, 4-diphenylaminobenzaldehyde 1-methyl-1-phenylhydrazone, etc., 4-nophenylaminostilbene, 4-diphenylaminostilbene, etc. Stilbene compounds such as benzylaminostilbene and 4-notrylaminostilpene; styrylnaphthalene compounds such as 1-(4-diethylaminostyryl)naphthalene and 1-(4-pennolaminostyryl)naphthalene; 4'-diphenyleaaminol; α-Phenylstilbene, 4'-methylphenylamino-α-phenylstilpenenatono α-phenylstilbene compound, 3-
Sterylcarbazole compounds such as styryl-9-ethylcarbazole and 3-(4-diethylamine)styryl-9-ethylcarbazole are used.

Examples of the electron transport substance include chloranil, bromoanil, tetracyanoethylene, tetracyanoquinone dimethane, 2,4.7-)dinitro-9-fluorenone, 2.4.5.7-tetranitro-9-fluorenone, 2. , 4,5.7-titranitroxanthone, 2,4.
8-) Linitrothioxanthone, 2,6°8-trinitro-4H-indeno[1,2-b ]]thiophene-4
-one 1,3.7-trinitronobenzothiophene-5,5-dioxide and the like.

The alkali-soluble resin used in the charge transport layer 4 refers to a resin that becomes soluble in an aqueous or alcoholic solvent by adding an alkali. For the purposes of the present invention, in addition to properties such as film-forming properties, electrical properties, and adhesion strength to a support, solubility properties are particularly important for these resins. Examples of resins having such characteristics include styrene-maleic anhydride copolymers, styrene-methacrylic acid-methacrylate copolymers, methacrylic acid-methacrylate copolymers, and phenol resins.

Examples of phenolic resins include phenol, 0-cresol, m-cresol, p-cresol, ethylphenol, inglobilphenol, t-butylphenol, t-cresol, and t-cresol.
-amylphenol, hexylphenol, t-octylphenol, nclohexylphenol, 3-methyl-4-chloro-6-t-butylphenol, inglovircresol, t-butylcresol, t-amylcresol, hexylcresol, t-octylphenol At least one substituted phenol such as cresol and cyclohexyl cresol, formaldehyde, acetaldehy: ? A novolak barrier resin obtained by condensing aldehydes such as , acrolein, crotonaldehyde, and furfural under acidic moxibustion conditions is used.

The charge transport layer 4 is a layer mainly composed of a charge transport substance and an alkali-soluble resin, and the ratio of the charge transport substance in the layer is 10 to 10.
70% by weight, preferably 20 to 60% by weight. When the proportion of the charge transport substance is below this range, almost no charge is transported, and when it is above this range, the mechanical strength of the layer is extremely poor and cannot be put to practical use. The thickness of the charge transport layer 4 is 2 to 50 μm, preferably 3 to 20 μm.

Below this range, the amount of charge will be insufficient, and above this range, the residual potential will be high and it will take time to elute the layer, making it impractical.

The charge transport layer 4 can contain a plasticizer.

Effective plasticizers include, for example, phthalic acid esters such as dimethyl phthalate, noethyl phthalate, and dibutyl phthalate, and glycol esters such as dimethyl glycol phthalate and ethyl phthalyl ethyl glycolate.

These plasticizers can be contained within a range that does not deteriorate the electrostatic properties and alkali solubility of the photoconductive layer.

The conductive support 1 used in the present invention is a metal plate such as an aluminum plate, a lead plate, a copper-aluminum plate, a copper-stainless steel plate, a chrome-copper plate, or a chrome-copper-aluminum plate; A conductive support with a hydrophilic surface such as a tri-metal plate such as a chromium-lead-iron plate or a chromium-copper-stainless steel plate is used, and its thickness is 0.1 mm.
~1 mm is preferred.

In addition, especially in the case of a support having an aluminum surface, surface treatments such as graining, immersion in an aqueous solution of sodium silicate, potassium fluorozirconate, phosphate, etc., or anodic diluting treatment are performed. Preferably. l) Aluminum plate treated by immersion in rum aqueous solution, as shown in U.S. Pat. No. 2,714,066, after graining,
It is also preferable to carry out an anodic oxidation treatment and then immersion treatment in an aqueous solution of an alkali metal silicate as shown in Japanese Patent No. 5125.

The above anodizing treatment is performed by using an aluminum plate as an anode in an electrolytic solution consisting of a solution of an inorganic acid such as phosphoric acid, chromic acid, sulfuric acid, or boric acid, or an organic acid such as oxalic acid or sulfamic acid, or a salt thereof. It is carried out by passing an electric current.

To produce the electrophotographic printing plate of the present invention, first, the pigment represented by the general formula (1) and a binder, if necessary, are mixed with, for example, tetrahydrofuran, dioxane, trimethylformamide, acetone, methyl ethyl lactone, ethylene, etc. glycol monomethyl ether, ethylene glycol,
The coating solution is mixed in an organic solvent such as monoethyl ether, vinegar e:rf, butyl acetate, toluene, or halogenated hydrocarbon, and uniformly dispersed using a dispersion means such as a ball mill or an ultrasonic dispersion machine. The charge generating layer 3 is provided by coating on the conductive support and drying. Next, a solution in which a charge transport substance and an alkali-soluble resin are dissolved in the same organic solvent as above is applied onto the charge generation layer and dried to form the charge transport layer 4.

The plate making of the printing original plate for electrophotographic platemaking of the present invention is carried out by first uniformly charging it in a dark place using a corona charger, etc., using a tungsten lamp, halogen lamp, xenon lamp, or fluorescent lamp, according to the usual electrophotographic method. An electrostatic latent image is formed by reflection image exposure using a light source, contact image exposure through a transparent positive film, or scanning exposure using a laser beam such as a He-Ne laser, argon laser, or semiconductor laser. The image is developed with toner and fixed by heating to obtain a toner image on the electrophotographic photosensitive layer (FIG. 2).

Next, when the printing plate on which the toner image has been formed in this way is immersed in an alkaline eluent, the electrophotographic photosensitive layer (charge generation layer and charge transport layer) in the non-image area that is not covered by the toner image is removed. The hydrophilic surface of the conductive support is exposed by dissolution, leaving only the toner image area, and a good printing plate can be obtained (FIG. 3).

The eluent used here is, for example, sodium silicate, phosphoric acid,
Alkaline aqueous solutions of inorganic salts such as sodium, sodium hydroxide, and sodium carbonate, or alkaline aqueous solutions containing organic amines such as triethanolamine and ethylenenoamine, or organic solvents such as ethanol, benzyl alcohol, ethylene glycol, and glycerin. A solution containing a surfactant or the like is used.

In the printing plate of the present invention, after the toner image is formed, the non-image area is dissolved and removed in the eluent, so the toner components include:
It is preferable that this eluate contains a resin component having renostotic properties.

This resin component may be anything that is insoluble in the eluate, such as acrylic resin using methacrylic acid, methacrylic acid ester, vinyl acetate resin, copolymer of vinyl acetate and ethylene or vinyl chloride, etc. , vinyl chloride resin, vinylidene chloride resin, vinyl acetal fat such as polyvinyl butyral, polystyrene, copolymers of styrene and butadiene, methacrylic acid esters, polyethylene, polypropylene and or so chlorides, polycarbodies, Examples include polyester resin, polyamide resin, phenolic resin, xylene resin, alkyd resin, wax, polyolefin, and wax.

The printing original plate of the present invention may also contain a quinone noasite compound or a noazo compound, such as 0-naphthoquinone noazodo, for the purpose of increasing the solubility of the electrophotographic photosensitive layer by full-surface exposure after toner image formation.

In the printing original plate of the present invention, after the plate-making process is completed, the conductive substrate with a hydrophilic surface is exposed in the non-image area, and the image area completely covered with the oleophilic toner remains. It adheres only to the image area, resulting in good printed matter without background stains.

In addition, the printing original plate of the present invention has particularly high sensitivity compared to conventional printing original plates. Direct plate making is possible with a ridge light source such as a He-Ne laser or a semiconductor laser, and the printing plate obtained thereby has a high printing durability. have.

Next, the present invention will be explained more specifically using examples.

In addition, all "parts" in the examples represent parts by weight.

Example 1 1 part of azo pigment/161 and 66.7 parts of a 0.74 wt% tetrahydrofuran solution of m-cresol-phenol copolymerized novolac resin (manufactured by Toden Chemical: MP-707) were ground and mixed in a ball mill. The thickness of the dispersion is about 0.2
It was coated on a 5 mm grained aluminum plate and dried at 80° C. for 10 minutes to form a charge generation layer with a thickness of about 1 μm.

2,5-bis(
4-Soethylamine phenyl) -1,3,4-oxadiazole 0.9 part Styrene -! 1.8 parts of water-maleic acid copolymer (copolymerization molar ratio 1:1, manufactured by Aldrich Chemical Co., Ltd.) and 13 parts of tetrahydrofuran.
A solution obtained by mixing and dissolving two parts was applied and dried at 80° C. for 20 minutes to form a charge transport layer having a thickness of about 10 μm, thereby producing a printing original plate for electrophotographic engraving of the present invention.

This original printing plate was negatively charged by -6kV corona discharge for 20 seconds using an electrostatic copying paper testing device (Rodenki Manufacturing Co., Ltd.: SP, -428 type).
Leave it in the dark for 0 seconds, and the surface potential V at that time. (bolt)
Then, the surface was irradiated with light using a tungsten lamp at an illuminance of 45 lux, and the surface potential was V.

Calculate the time required to reduce the exposure to half of
lux seconds) was calculated. The results are shown in Table-1.

Next, this original printing plate was applied to an electronic copying plate making machine (Ricoh S-1).
A clear toner image was formed on the charge transport layer by charging, imagewise exposure, development and fixing.

This original plate was mixed with 70 g of sodium metasilicate and 14 g of glycerin.
The photosensitive layer was immersed for 1 minute in a solution consisting of 0rnl, 550g of ethylene glycol, and 150g of ethanol, and washed by gently brushing with water to remove the electrophotographic photosensitive layer in the non-image areas to which toner was not attached.

The printing plate made in this way is then printed on an offset printing machine (
AP-1310 model manufactured by Ricoh Co., Ltd.) and printed using a conventional method, it was possible to print more than 50,000 clear prints.

Examples 2 and 3 Printing for electrophotographic printing of the present invention was carried out in the same manner as in Example 1, except that the compounds shown in Table 1 were used as the azo pigment used in the charge generation layer and the charge transport substance used in the charge transport layer, respectively. Create the original version, v.

and E1/2 were measured.

The above results are shown in Table-1.

(Left below) Example 4 1 part of azo pigment A63, 0 part of m-cresol-phenol copolymerized novolac resin (manufactured by Toden Chemical: MP-707)
．． 66.7 parts of a 74 wt% tetrahydrofuran solution was pulverized and mixed in a ball mill, and the resulting dispersion was mixed to a thickness of approximately 0.5 wt%.
It was coated on a 25 mm grained aluminum plate and dried at 80° C. for 10 minutes to form a charge generation layer with a thickness of about 1 μm.

3-styryl- as a charge transport substance on this charge generation layer.
1.5 parts of 9-ethylcarbazole, m-cresol-phenol copolymerized novolac resin (manufactured by Toden Chemical: MP
-707) and 120 parts of tetrahydrofuran were applied and dried at 80°C for 2 minutes and then at 100°C for 10 minutes to form a charge transport layer with a thickness of about 10 μm. A printing original plate for electrophotographic engraving of the invention was created. Regarding this printing original plate, V was used in the same manner as in Example 1. and E1/2 measurement results are shown in Table-2.

Next, a toner image was formed on the electrophotographic photosensitive layer of this printing original plate in the same manner as in Example 1, and then immersed in a solution consisting of 25 parts of sodium metasilicate and 100 parts of water for about 45 seconds, and then lightly blown with water. The electrophotographic photosensitive layer in the non-image area was removed by washing while brushing.

When the printing plate made in this way was printed on an offset printing machine, more than 50,000 clear prints could be printed.

Examples 5 to 8 Printing for electrophotographic printing of the present invention was carried out in the same manner as in Sister Example 4, except that the compounds shown in Table 2 were used as the azo pigment used in the charge generation layer and the charge transport substance used in the charge transport layer, respectively. An original plate was prepared, and VO and E1/2 were measured.

The above results are shown in Table-2.

(Margin below)

[Brief explanation of drawings]

FIG. 1 is a diagram showing the basic structure of the printing original plate for electrophotographic engraving of the present invention. Figures 2 and 3 are diagrams explaining the plate-making process of the printing original plate of the present invention, where Figure 2 shows a state in which a toner image has been formed, and Figure 3 shows a state in which a non-image area has been eluted and removed. . 1... Conductive support, 2... Electrophotographic photosensitive layer, 3...
Charge generation layer, 4. Charge] Forging layer, 5. Toner image. Patent Applicant Ricoh Co., Ltd. - Figure 1 Figure 2 et Figure 3 Procedural Amendment Form) % Formula % 1. Indication of the case 1982 Patent Application No. 95856 2. Name of the invention Printing original plate for electrophotolithography 3. Relationship with the case of the person making the amendment Patent applicant address: 3-6 Nakamagome-chome, Ota-ku, Tokyo 143 Name (674) Ricoh Co., Ltd. 6 As per the content of the amendment (no change in content)

Claims (1)

[Claims] Consisting of two layers, a charge generation layer containing an azo pigment represented by the following general formula (1) and a charge transporting waste containing a charge transport substance and an alkali-soluble resin, on a conductive support. A printing original plate for JE plate making, characterized by being provided with an electrophotographic photosensitive layer. General formula (1) (However, in the formula, A represents a Kaglar residue.)