JPS60243668A - Original printing plate for electrophotographic engraving - Google Patents

Abstract

PURPOSE:To enhance sensitivity and printing resistance, etc., by using a specified azo pigment as an electrostatic charge generating material to be added to a charge generating layer in an original printing plate for electrophotographic engraving having a photosensitive layer composed of the charge generating layer and a charge transfer layer. CONSTITUTION:The intended original printing plate for electrophotographic engraving is obtained by forming on a conductive substrate 1 an electrophotographic sensitive layer 2 composed of the charge generating layer 3 contg. an azo pigment represented by formula I, (A) being a coupler residue, such as formula II, and the charge transfer layer 4 contg. a charge transfer material, such as formula III and an alkali-soluble resin, such as a styrene-maleic anhydride copolymer of a phenolic resin. A good printing plate is obtained by uniformly charging this electrophotographic material, imagewise exposing it, developing the obtained electrostatic latent image with a toner, and heat fixing the toner image on the photosensitive layer 2, and dissolving off the nonimage part of the layer 2.

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, the present invention relates to a novel printing plate containing a specific azo pigment, which is made by eluting and removing an electrostatic latent image obtained by charging and subsequent imagewise exposure with a toner to remove the 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, and so-called direct plate making is not possible, and it is necessary to create negatives or positives from the original using silver halide film. For this purpose, it requires complicated equipment and has drawbacks such as the time required for plate making.

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

As printing plates for direct plate making using the electrophotographic method, there are Tokuko Tokuko 47610 (1971) and Tokuko Tokuko (1977-40).
002, Special Publication No. 48-18325, Special Publication No. 51-157
Printing plates of a zinc oxide-resin dispersion system are known, such as 66, 婢小显 51-2 et al. 761-8 dynasty. 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, destroying the hydrophilic layer on the surface. The printing durability was about 5,000 to 10,000 sheets.

However, zinc oxide/resin dispersion printing plates undergo dye sensitization in order to have sensitivity in the visible light region, 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-power and inexpensive He-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 46-39405, JP 52-2437, JP 56-107246, JP 55-105254,
JP-A-55-153948, JP-A-55-16125
, JP-A-57-1476'56, JP-A-56-1461
4.5, JP-A-57-161863, etc. disclose a layer consisting of an organic photoconductive compound and an alkali-soluble resin, or a phthalocyanine-based layer on a hydrophilic conductive support such as a grained aluminum plate. A printing original plate for electrophotographic engraving is disclosed which is provided with a layer in which a charge-generating pigment such as a pigment is dispersed in an alkali-soluble resin, or a layer sensitized by adding an electron-withdrawing substance or an electron-donating substance to this dispersed layer. ing.

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 low sensitivity as a photoreceptor for electrophotography, so
It has the drawbacks of 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 above-mentioned problems of the conventionally known printing original plates for electrophotolithography, and to provide a printing original plate with particularly high sensitivity and high printing durability. A printing original plate for photolithography consists of two layers: 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 a photographic photosensitive layer.

General formula (1) (However, A represents a coupler residue.) The basic structure of the printing original plate for electrophotographic engraving of the present invention is shown in FIG.

Here, 1 is a conductive support, and a charge generation layer 3 and a charge transport layer 4 are laminated thereon to form an electrophotographic photosensitive layer 2.

The charge generation layer 3 and the charge transport layer 4 can also be stacked upside down.

Coupler for azo pigment used in charge generation layer 3 and engraving of the LA (no change in content) Compounds having phenolic hydroxyl groups, aromatic amino compounds having amine groups, aminonaphthols having amine groups and phenolic hydroxyl groups Alternatively, a compound having an aliphatic or aromatic enolic ketone group (active methylene group) is used, and preferably the coupler residue A has the following general formula (II), (III), (It/), (V ), (Vl
), (■).

[Wherein, R1 is hydrogen, an alkyl group, a phenyl group, or a substituent thereof; X is a hydrocarbon ring or a substituent thereof; a heterocycle or a substituent thereof; Y is a hydrocarbon ring group or a substituent thereof; cyclic group or substituted product thereof or -
N-CHgR2 (however, R23 is a hydrocarbon ring group or a substituent thereof, a heterocyclic group j4
1/-tJ--) q r Mii Kyo&' k z l to Ito-y leather I+, 1.廿咄J+ 该评论（未发现结构）给关聚性体、R3为氢、烷烷组、苯酯组、
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 (1) and (IV) represents a substituted or unsubstituted hydrocarbon group.) (In the formula, R5 represents an alkyl group, a carbamoyl group, a carxyl group, or an ester thereof. , and A r 1 represents a hydrocarbon ring group or a substituent thereof.) 6U Copy of the specification (no change in content) (In the formula, R6 represents a hydrocarbon ring group or a substituent thereof, A
r 2 represents a hydrocarbon ring group or a substituted product thereof.

) Examples of the hydrocarbon ring for X in the general formula used in the present invention include a benzene ring and a naphthalene ring; examples of the heterocycle include an indole ring, a carbazole ring,
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 nobenzofuranyl group, and a fluorene ring.

Furthermore, examples of the hydrocarbon group in 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 halogen atoms, hydroxyl groups, and nitro groups. 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, dialkylamino groups such as nomethylamino and diethylamino groups, dialkylamino groups such as dibenzylamino, trifluoro Examples include a halomethyl group such as a methyl group, a nitro group, a cyan group, a carboxyl group or an ester thereof, a hydroxyl group, a sulfonic acid group (-8o!, Na), and the like. Furthermore, as the hydrocarbon ring group in Ar1 or Ar2, phenyl group, naphthyl group, etc.
Substituents for these groups include alkyl groups such as methyl, ethyl, propyl, and butyl; alkoxy groups such as methoxy, ethoxy, propoxy, and butoxy; nitro; chlorine; and bromine. Examples include halogen atoms such as, dialkylamine groups such as cyano group, trimethylamino group, and diethylamino group.

The azo pigment used in the present invention is, for example, JP-A-52-
It is described in Publication No. 8832. Examples of these azo pigments are as follows.

Ka Kamei #4 of the book (no change in content) Chopsticks < Engraving of detailed statement (no change in content)? - Ll'') CD 饗 ζ Engraving of the specification (no change in content) ト ■ ζ 〈 工■ 〇ga One of the specifications: (no change in the internal wording) Iso 饗 ζ Engraving of the specification (yen J (no change to the contents) is a vote.Engraving of the bill statement (no change to the contents).Country and country! No. 4 play (no change in content) Ni〈Mi East engraving of detailed statement (no change in content) Responsible Yoshiiso〈 Engraving of specification (no change in content) ze× chopsticks W Engraving of detailed statement (no change in content) (None) Den Q Tadasa Wara Koro Chin specification; engraving (no change in content) Tsubasa Iso specification engraving (no change in content 9) The charge generation layer 3 is mainly composed of an azo pigment represented by the general formula (1) The layer may contain a binder if necessary. In this case, the proportion of the azo pigment in the charge generation layer is preferably 30% by weight or more. In order to elute the image area, when using a binder, for example, an alkali-soluble resin such as styrene-maleic anhydride copolymer or Novlac type phenol resin (described in detail later) may be used. This is preferred. However, other resins may be used as long as the proportion of the binder is small. The thickness of the charge generation layer 3 is preferably 0.01 to 5 μm, more preferably 0.05 μm.
~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 a charge transport substance and an alkali-soluble resin. Charge transporting materials include hole transporting materials and electron transporting materials, and examples of hole transporting materials include:
2,5-bis(4-diethyl 2,5-bis[4-(4-
diethylaminostyryl)phenyl)-1,3,4-oxadiazole, 2-(9-ethylcarbasolyl)-3-
)-5-(4-diethylaminophenyl)-1,3,4
-oxanoazole compounds such as oxadiazole, 2
-vinyl-4-(2-chlorophenyl)-5-(4-diethylamino)oxazole, 2-(4-diethylaminophenyl)-4-phenyloxazole tonoxazole compound, ■-phenyl-3-(4-diethylaminostyryl) -5-(4-diethylaminophenyl)pyrazoline, 1-phenyl-3-(4-dimethylaminostyryl)-5-(4-dimethylaminophenyl)pyrazoline and other pyrazoline compounds, 2,2'-dimethyl-4
, 4'-bis(diethylamino)triphenylmethane,
1,1-bis(4-dibenzylaminophenyl)propane, diphenylmethane compounds such as tris(4-diethylaminophenyl)methane, 9-(4-trimethylaminobenzylidene)fluorene, 3-(9-) fluorene compounds, styryl anthracene compounds such as 9-(4-diethylaminostyryl) anthracene and 9-bromo-10-(4-diethylaminostyryl) anthracene;
Distyrylbenzene compounds such as 1,2-bis(4-diethylaminostyryl)benzene and 1,2-bis(2,4-dimethoxystyryl)benzene, 9-ethylcarbazole-3-aldehyde 1-methyl-1-phenylhydrazone , 9-ethylcarbazole-3-aldehyde 1-
Benzyl-1-phenylhydrazone, 4-diethylaminobenzaldehyde 1,1-diphenylhydrazone, 2
．． 4-diphthoquine benzaldehyde 1-benzyl-1-
Hydrazone compounds such as phenylhydrazone, 4-diphenylaminobenzaldehyde 1-methyl-1-phenylhydrazone, 4-diphenylaminostilbene, 4-
Stilbene compounds such as sobennolaminostilbene and 4-ditolylaminostilbene; styrylnaphthalene compounds such as 1-(4-diphenylaminostyryl)naphthalene and 1-(4-dibenzylaminostyryl)naphthalene; 4'-diphenylamino - α-phenylstilbene compounds such as α-phenylstilbene, 4′-methylphenylamino-α-phenylstilbene, 3-styryl-9-ethylcarbazole, styryl of 3-(4-diethylamino)styryl-9-ethylcarbazole Carbazole compounds are used.

Examples of the electron transport substance include chloranil, bromoanil, tetracyanoethylene, tetracyanoquinone dimethane, 2,4,7-)linitro-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]]thiophen-4-one 1,3.7-) linitrodipenzothiophene-5,5-dioxide and so on.

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.

Phenol resins include phenol, 0-cresol, m-cresol, p-cresol, ethylphenol, isopropylphenol, t-:rthylphenol, t-amylphenol, hexylphenol, t-octylphenol, cyclohexylphenol, 3 At least one of substituted phenols such as -methyl-4-chloro-6-tert-butylphenol, isonorovir cresol, 1-butyl cresol, (-amyl cresol, - quinle cresol, L-octyl cresol and/chlorohexyl cresol) A lac-type resin is used, which is obtained by condensing one type of aldehyde with an aldehyde such as formaldehyde, acetaldehyde, acrolein, crotonaldehyde, or furfural under acidic conditions.

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 20-60% 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. Further, 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 elution of the layer will take a long time, making p1 impractical.

The charge transport layer 4 can contain a plasticizer.

Effective plasticizers include phthalic acid esters such as dimethyl phthalate, noethyl phthalate, and dibutyl phthalate/z, 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 an aluminum plate, a zinc plate, a bimetallic plate such as a copper-aluminum plate, a copper-stainless steel plate, a chromium-copper plate, or a chromium-copper-aluminum plate, a chromium-S-iron plate. A conductive support having a hydrophilic surface such as a tri-metal plate such as a chromium-copper-stainless steel plate or the like is used, and the thickness thereof is 0.
1 to 1 teacher is preferred.

In addition, especially in the case of a support having an aluminum surface, surface treatments such as graining treatment, dipping treatment in an aqueous solution of sodium silicate, potassium fluorozirconate, phosphate, etc., or anodizing treatment may be applied. Preferably what is being done. As shown in U.S. Pat. No. 2,714,066, an aluminum plate immersed in an aqueous sodium silicate solution after graining, JP-A-47-1999.
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 printing plate for electrophotographic engraving of the present invention, first, the pigment represented by the general formula (I) and a binder, if necessary, are mixed with, for example, tetrahydrofuran, nooxane, dimethylformamide, acetone methyl ethyl ketone, ethylene glycol monomethyl ether, etc. , mixed in organic solvents such as ethylene glycol monoethyl ether, ethyl acetate, butyl acetate, toluene, and halogenated hydrocarbons; −
A coating solution uniformly dispersed using a dispersing means such as a Lumil ultrasonic dispersion machine is coated on the conductive support and dried to form a charge generation layer 3. 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 original printing plate for electrophotographic platemaking of the present invention is performed by first uniformly charging it in a dark place using a corona charger or the like, using a tungsten lamp, halogen lamp, etc., according to the usual electrophotographic method.
Electrostatic latent image exposure is performed by reflection image exposure using a light source such as a xenon lamp or fluorescent lamp, contact image exposure through a transparent positive film, or scanning exposure using a laser beam such as a He-Ne laser, an alkone laser, or a semiconductor laser. An image is formed, this electrostatic latent 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 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 masked by the toner image is dissolved. When removed, the hydrophilic surface of the conductive support is exposed and only the toner image portion remains, making it possible to obtain a good printing plate (FIG. 3).

The eluent used here is, for example, an alkaline aqueous solution containing organic amines such as sodium silicate, sodium phosphate, sodium hydroxide, sodium carbonate, triliethanolamine, and ethylenenoamine; A solution containing an organic solvent or a surfactant 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 resist 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 acecool resin such as polyvinyl butyral, polyethylene, copolymers of styrene and butadiene, methacrylic acid ester, polyethylene, polypropylene and their chlorides,
Polycarbonate, polyester resin? Examples include lyamide resin, phenolic resin, xylene resin, alkyd resin, wax, polyolefin, and wax.

In order to increase the solubility of the electrophotographic photosensitive layer by exposing the entire surface to light after forming the toner image, the printing original plate of the present invention contains
-Can also contain quinonediazide compounds or diazo compounds such as naphthoquinonediazide.

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 covered with oleophilic toner remains. The ink adheres only to the image area, resulting in good printed matter without scumming.

In addition, the printing original plate of the present invention has the following characteristics compared to conventional printing original plates:
It has particularly high sensitivity and can be directly plate-made using various light sources such as a He-Ne laser or a semiconductor laser, and the printing plates obtained thereby have high printing durability.

Next, the present invention will be explained in more detail with reference to Examples.

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

Example 1 One part of Azo Pigment Shop 1 was mixed with 0.0 parts of m-cresol-phenol copolymerized novolac resin (MP-707 manufactured by Gunei Chemical Co., Ltd.).
667 parts of a 74 wt% tetrahydrofuran solution was pulverized and mixed in a ball mill, and the resulting dispersion was applied onto a grain-treated aluminum plate with a thickness of about 0.25 mm, and dried at 80° C. for 10 minutes to give a thickness of about 0.2 mm. A charge generation layer of 1 stiffness was formed.

2,5-bis(
09 parts of 1,3,4-oxadiazole (4-diethylaminophenyl), 1.8 parts of styrene-maleic anhydride copolymer (manufactured by Aldrich Chemical Company, copolymerization molar ratio 1:1), and 1 part of tetrahydrofuran.
A solution in which 32 parts were mixed and dissolved was applied and dried at 80° C. for 20 minutes to form a charge transport layer with a thickness of about 101 Lrn.
A printing original plate for electrophotographic engraving of the present invention was prepared.

This original printing plate was tested using an electrostatic copying paper tester (manufactured by Kawaguchi Electric Co., Ltd., 5P-428 model) to determine -6k.
After performing corona discharge of V for 20 seconds to make it negatively charged, it was left in a dark place for 10 seconds, and the surface potential Vo (+t
Next, irradiate the surface with light using a tungsten lamp at an illuminance of 4.5 lux, measure the time it takes for the surface potential to reach vOO, and calculate the half-reduction exposure E1/2. (lux/second) 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, 550ml of ethylene glycol, and 150ml of ethanol, and was further washed with water while gently brushing to remove the electrophotographic photosensitive layer in the non-image area to which toner was not attached.

The printing plate made in this way is then printed on an offset printing machine (
Ricoh AP-1310)
11 Each of them was able to print 7-person prints using the F100OO instruction.

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. An original plate was prepared, and VO and E1/2 were measured.

The above results are shown in Table-1.

(Margins below) Engraving of Specification 1 (no changes to the contents) Example 4 1 part of Azo Pigment Flat 4 and 0.0 parts of m-cresol-phenol copolymerized novolak resin (manufactured by Gunei Chemical Co., Ltd.: MP-707).
667 parts of a 74 wt% tetrahydrofuran solution was pulverized and mixed in a Zeel mill, the resulting dispersion was applied onto a grained aluminum plate with a thickness of about 0.25 mm, and dried at 80° C. for 10 minutes to form a powder with a thickness of about 1 μm. A charge generation layer was formed.

3-styryl- as a charge transport substance on this charge generation layer.
15 parts of 9-ethylcarbazole, m-cresol-phenol copolymerized novolac resin (manufactured by Gunei Chemical: MP-
707) A mixed solution of 3.0 parts and 120 parts of tetrahydrofuran was applied and heated at 80°C for 2 minutes, followed by 1
A charge transporting layer having a thickness of about 10 μm was formed by drying at 00° C. for 10 minutes, thereby producing a printing original plate for electrophotolithography of the present invention. Regarding this printing original plate, the pH was V as in the case of pH1. and E1/2 measurement results are shown in Table-2.

Next, apply 1+1J on the electrophotographic photosensitive layer of this printing original plate.
After forming a toner image in the same manner as in step 1, it was immersed in a solution consisting of 25 parts of sodium metasilicate and 100 parts of water for about 45 seconds, and was further washed while lightly brushing with water to remove the electrophotographic photosensitive layer in non-image areas. did.

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 Electrophotographic engraving of the present invention was carried out in the same manner as in 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. Create a printing master plate for v.

and E1/2 were measured.

The above results are shown in Table-2.

(Margin below)

[Brief explanation of the drawing]

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 transport layer, 5... Toner image. Patent Applicant Rico Co., Ltd. - Figure 1 Figure 2 Figure 3 Procedural Amendment Form) September 27, 1980 Patent Application No. 99889 2, Name of Invention Printing Original Plate for Electrophotographic Engraving 3 , Relationship with the case of the person making the amendment Patent applicant address 3-6-4 Nakamagome-chome, Ota-ku, Tokyo 143
, Date of amendment order (shipment date) August 28, 1982 5
, Chemical formula 6 of the specification subject to amendment, Contents of amendment

Claims (1)

[Claims] An electronic device consisting of two layers, 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. A printing original plate for electrophotographic engraving, characterized by being provided with a photosensitive layer. General formula (1) (However, in the formula, A represents a coupler residue.)