JPS60243669A - 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 methacrylic acid-metharylate-copolymer or 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 printing plate is a new printing plate containing a specific azo pigment, which is electrically charged, subsequently developed, fixed to obtain a toner image, and then the photosensitive layer in the non-image area is eluted and removed. Regarding.

BACKGROUND ART Hitherto, lithographic printing plates 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 cannot be used in so-called direct plate making, requiring operations to create negatives or blemishes using silver halide film from the initial draft. However, there are drawbacks such as requiring extensive equipment and time-consuming 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 sheet.

As a printing plate for direct plate making using electrophotography, for example, Japanese Patent Publication No. 47-47610. Tokutokuko Showa 51-1
5766 and Japanese Patent Publication No. 51-25761, printing plates having a zinc oxide-resin dispersion system are known. After a toner image is formed on this printing plate by electrophotography, it is treated with an acidic aqueous solution containing, for example, a ferrocyanate 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. Printing durability is 5,000 ~
10. There were about 0 pieces of OO'.

In addition, zinc oxide/resin dispersion printing plates are dye sensitized 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
45, JP-A-57-161863, etc., discloses, for example, a layer consisting of an organic photoconductive compound and an alkali-soluble resin on a hydrophilic conductive support such as a grained aluminum plate, or , a layer in which a charge-generating pigment such as a phthalocyanine pigment is dispersed in an alkali-soluble resin, or a layer sensitized by adding an electron-attracting substance or an electron-donating substance to this dispersed layer, etc. for electrophotographic engraving. The original printed version is shown. 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 above-mentioned problems of the conventional printing plate for photoengraving of electronic specifications (with no changes in content), and to provide particularly high sensitivity and high printing durability. The goal is to provide the original printing version.

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) The basic structure of the printing original plate for electrophotolithography of the present invention is expressed as
As shown in the figure. Here, 1 is a conductive support, on which is a charge generation layer 3, and a charge transport layer specification (no change in content).The charge generation layer 3 and the charge transport layer 4 are stacked upside down. is also possible.

Examples of the azo pigment puller used in the charge generation layer 3 include compounds having a phenolic hydroxyl group such as phenols and naphthols, aromatic amino compounds having an amine group, and aminonaphthols having an amine group and a phenolic hydroxyl group. A compound having an aliphatic or aromatic enolic ketone group (active methylene group) is used, and preferably the cassilla residue A has the following general formula (It),
It is selected from the group represented by (III), (IV), (V), (Vl), and (■).

[In the formula 1, R4 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 (
No changes to the content 5. Wow 5. )□4a 6. y-, -6□te1, yi, 23 are hydrocarbon ring groups or their substituents, heterocyclic groups or their substituents, or styryl groups or their substituents, R3 is hydrogen, an alkyl group, R2 and R5 may represent a phenyl group or a substituted product thereof, or R2 and R5 may form a ring together with the carbon atom to which they are bonded. )] (R40′i in formulas (1[1) and (IV) represents a substituted or unsubstituted hydrocarbon group.) A r .

(In the formula, R5 represents an alkyl group, a carbamoyl group, a carboxyl group, or an ester thereof, and A r + represents a hydrocarbon ring group or a substituted product thereof.) 60 Reprint of the specification (no change in content).

N -C-Ar2 11 60 (wherein, R6 is a hydrocarbon 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 cal-gunol ring, and a benzofuran ring; Alternatively, examples of the hydrocarbon ring group in R2 include phenyl group, naphthyl group, anthryl group, and pyrenyl group; examples of the heterocyclic group include pyrinol group, chenyl group, furyl group, indolyl group, benzofuranyl group, carbazolyl group, and nopenzo group; Furanyl group, also R
Examples of terms that can be formed by 2 and R3 together with the carbon atoms to which they are bonded include 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 pennol, aryl groups such as phenyl, or substituted products thereof. R4
Or as a substituent on the hydrocarbon group of R6, methyl group, ethyl group 1. Examples include alkyl groups such as propyl group and butyl group, alkoxy groups such as methquine group, ethoxy group, propokine group and butoxy group, halogen atoms such as chlorine atom and bromine atom, hydroxyl group, and nitro group. R1
As the phenyl group or the substituent in the term of
Examples of substituents on the ring that can be formed include alkyl groups such as methyl, ethyl, propyl, and butyl; alkoxy groups such as methquine, ethoxyl, propochyne, and butquine; chlorine and bromine atoms; Halogen atoms, noalkylamino groups such as dimethylamine groups and soethylamine groups, dialkylamine groups such as nobennolamino groups, halomethyl groups such as trifluoromethyl groups, nitro groups, anno groups, carboxyl groups or their esters, hydroxyl groups, sulfones Examples include acid group (-8OsNa). Further, examples of the hydrocarbon ring group in Ar or A r 2 include a phenyl group and a naphthyl group, and examples of substituents in these groups include a methyl group,
Alkyl groups such as ethyl group, globyl group, and butyl group; alkoxy groups such as methoxy group, ethquine group, zoropoxy group, and butoxy group; halokene atoms such as nitro group, chlorine atom, and bromine atom; Examples include noalkylamino groups such as diethylamino groups.

The azo pigment used in the present invention is, for example, JP-A-56-
It is described in No. 83744. Examples of these azo pigments are as follows.

(Leaving space below) Ming; Jll Co's Joshu (no changes to the content) - Tasho The engraving of the details (no changes to the contents) The engraving of the detailed statement (no changes to the contents) The engraving of the detailed statement (no changes to the contents) No change) Piden Tasaku Koro's engraving of the detailed statement (no change in content) Tora Koroaki, 1l Il's engraving (no change in content) = = Kojo Iso's engraving of detailed statement (no change in content) Revised detailed statement Ko no Jyoko (no change in '3) Iso Ishikawa engraving (no change in content) Iso Jōmei Kenma's engraving (no change in content) Fusuma Kenmei a's: *'a (change in content) None) Rigo, 7 Tsubasa Addressed to Iso's details ``': J'' Ko (no change in content) Miss Jyo Ming's letter (no change in content) 饗 3 Details - body:? + Engraving of detailed statement (no change in content) -
(No change in content) Engraving of specification (No change in content) The charge generation layer 3 is a layer mainly composed of an azo pigment represented by the general formula (1), but may contain a binder if necessary. can do. In this case, the proportion of the azo pigment in the charge generation layer is preferably 30% by weight or more. Since the printing original plate of the present invention elutes the non-image areas during the plate-making process, when using a binder, examples of the binder include alkali-soluble resins such as styrene-maleic anhydride copolymer and Novlac type phenolic resin. (described in detail later) is preferably used. However, if the proportion of the binder is small, it is also possible to use other resins. The thickness of the charge generation layer 3 is preferably 0.001 to 5 μm, more preferably 0.001 to 5 μm.
05-2 μm. If the thickness is less than 0.001 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 substances include hole transporting substances and electron transporting substances, and the hole transporting substance minophenyl) -1
,3,4-oxanoazole,2,5-bis(4-(4
-diethylaminostyryl)phenyl]-1,3,4-
Oxanoazole, 2-(9-ethylcarbazolyl-3)
-) -57(4-noacylaminophenyl) -1,
Oxadiazole compounds such as 3,4-oxanoazole, 2-vinyl-4-(2-chlorophenyl)-5-(
Oxazole compounds such as 4-noacylamino)oxazole, 2-(4-noacylaminophenyl)-4-phenyloxazole, 1-phenyl-3-(4-diethylaminostyryl)-5L(4-noacylaminophenyl) pyrazoline compounds such as pyrazoline, l-phenyl-3-(4-nomethylaminos/l/)-5-(4-tumethylaminophenyl)pyrazoline;
2,2'-trimethyl-4,4'-bis(noacylaminophenyl)triphenylmethane, 1,1-bis(4-sobennoraminophenyl)furonogun, tris(4-noacylaminophenyl)methane, etc. diphenylmethane compound,
Fluorene compounds such as 9-(4-)(9-fluorenonedene)-9-ethylcarnogzole, 9-(4-noethylaminostyryl)anthracene, 9-bromo-10
styryl anthracene compounds such as -(4-noethylaminostyryl)anthracene, 1,2-bis(4-noethylaminostyryl)benzene, 1,2-bis(2,4
-nomethoxystyryl) benzenato nostyrylbenzene compound, 9-ethyl, 17) vpazol-3-aldehyde 1-methyl-1-phenylhydrazone, 9-ethylcaltuxol-3-aldehyde l-bentulu 1
-Phenylhydrazone, 4-noethylaminobenzaldehyde 1,1-nophenylhydrazone, 2,4-nomethquine benzaldehyde 1-pentrue 1-phenylhyto'yzo'/, 4-nophenylaminobenzaldehyde l
-Hydrazone compounds such as methyl-1-phenylhydrazone, stilbene compounds such as 4-nonphenylaminostilbe7.4-') pennolaminostilbene, 4-1tolylaminostilbene, 1-(4-nophenylaminostilbene), styrylnaphthalene compounds such as styryl)naphthalene, t-(4-)R-ndylaminostyryl)naphthalene,
4'-knobuynylamino-α-phenylstilbene, 4
'-Methylphenylamino-α-phenylstilbenatono α-phenylstilbene compounds, 3-styrylcarbazoles such as 3-(4-',:,'ethylamine)styryl-9-ethylcarbazole A compound is used.

Examples of the electron transport substance include chloranil, bromoanil, tetraanoethylene, tetracyanoquinonomethane, 2,4,7-dolinitro-9-fluorenone, 2,4,5,7-tetranitro-9-fluorenone,
2,4,5.7-Titranitroxanthone, 2,4.8
-Trinidrothioxanthone, 2,5゜8-trinitro-4H-indenoC1,2-b]]thiophene-4-
LL7-t') nitronohenezothiophene-5,
Examples include 5-nooxide.

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 completely adding an alkali thereto. 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 the phenolic resin include phenol, 0-cresol, m-cresol, p-cresol, ethylphenol, isofo-pylphenol, t-butylphenol, and t-cresol.
-amylphenol, hexylphenol, t-octylphenol, /chlorohexylphenol, 3-methyl-4-chloro-6-t-butylphenol, isozolovircresol, t-butylcresol, t-amylfresol, hex/lucresol , t-octyl cresol and /chlorohexyl cresol, and aldehydes such as formaldehyde, acetaldehyde, acrolein, crotonaldehyde, and furfural under acidic conditions. 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 weight scale, preferably 20 to 60 weight scale. 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 is insufficient, and above this range, the residual potential becomes high and it takes a long 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, soethyl 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 an aluminum plate, a zinc plate, a metal plate such as a copper-aluminum plate, a copper-stainless steel plate, a chromium-copper plate, or a chromium-copper-aluminum plate, a chromium-lead plate. - A conductive support with a hydrophilic surface such as a trimetal plate such as an iron plate, a chromium copper plate or a stainless steel plate is used, and its thickness is 0.1 mm.
Theory 1 is preferred.

In addition, especially in the case of a support having an aluminum surface, surface treatments such as graining, dipping in an aqueous solution of sodium silicate, potassium fluorozirconate, phosphate, etc., or anodizing are performed. Preferably. Furthermore, as shown in U.S. Pat. No. 2,714,066, an aluminum plate which is immersed in a sodium silicate aqueous solution after graining, and JP-A No. 47-5
After anodizing as shown in Publication No. 125,
Also preferred are those treated by immersion in an aqueous solution of alkali metal silicate.

The above-mentioned anodizing treatment is performed by applying an electric current 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 sulfamines, or a salt thereof. It is carried out by flowing.

To produce the printing plate for electrophotographic engraving of the present invention, first, the pigment represented by the general formula (1) and a binder, if necessary, are mixed with, for example, tetrahydrofuran, nooxane, trimethylformamide, acetone, methyl ethyl ketone, or ethylene glycol. The coating liquid is mixed in an organic solvent such as monomethyl ether, ethylene glycol monoethyl ether, ethyl acetate, methyl acetate, toluene, or halogenated hydrocarbon, and uniformly dispersed using a dispersion means such as a hole mill or an ultrasonic disperser. Coating it on the conductive support and drying it,
A charge generation layer 3 is provided. Next, a solution of a charge transport substance and an alkali-soluble resin dissolved in the same organic solvent as above is applied onto the entire 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, full-cone laser, or 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 elution i used here is, for example, an alkaline aqueous solution of an inorganic salt such as sodium silicate, sodium phosphate, sodium hydroxide, or sodium carbonate, or an aqueous prucal solution containing organic amines such as i-liethanolamine or ethylenenoamine, or A solution containing an organic solvent such as Raniethanol, pennol alcohol, ethylene glycol, or glycerin 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 renostotic properties.

This resin component may be one that does not stain the eluate; for example, acrylic resin using methacrylic acid or methacrylic ester, vinyl acetate resin, or a combination of vinyl acetate and ethylene or vinyl chloride. Polymers, vinyl chloride resins, vinylidene chloride trees] L, rvinyl butyral and other vinyl acetal butadiene, copolymers such as methacrylic acid esters, polyethylene, polypropylene and its chlorides, polycarbonates, polyester resins, polyamide resins, Phenolic resin, xylene resin, alkyl, dem fat,
These include wood, polyolefin, wax, etc.

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

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

Fortunately, the printing original plate of the present invention has particularly high sensitivity compared to conventional printing original plates, and direct plate making is possible with various light sources such as He-Ne laser and semiconductor laser, and the printing plate obtained thereby is expensive. It has printing durability.

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

In addition, "1 part" in the examples all represent parts by weight.

Example 1 A total of 1 part of Azo Pigment Flat 1, 0.00% of m-cresol-phenol copolymerized novola resin (manufactured by Gunei Chemical Co., Ltd.: MP-707).
667 parts of a 74wt4 tetrahydrofuran solution was pulverized and mixed in a ball mill, and the resulting dispersion was applied onto a grained aluminum plate with a thickness of about 0.025mm and heated at 80°C.
This was dried for 10 minutes to form a charge generation layer with a thickness of about 1 μm.

2,5-bis(
4-noacylaminophenyl) -1,3,4-oxanoazole 09 parts, 1.8 parts of styrene-maleic anhydride copolymer (copolymerization molar ratio 1:1 manufactured by Aldrinohi Chemical Kanguni) A solution prepared by mixing and dissolving 132 parts of tetrahydrofurano and 132 parts of tetrahydrofurano was applied and dried at 80° C. for 20 minutes to form a charge transport layer having a thickness of about 1 olim, thereby producing a printing original plate for electrophotographic engraving of the present invention.

This printing original plate was tested using an electrostatic copying paper testing device (Model 5P-428, manufactured by Ichiko Denki Seisakusho Co., Ltd.).
After performing kV corona discharge for 20 seconds to make it negatively charged, it was left in a dark place for 10 seconds, and the surface potential at that time was ■. (volt), then irradiate the surface with light using a tungsten lamp 0 at an illuminance of 45 lux V (volts), and measure the time until the surface potential becomes 1/2 of V.
The half-reduced exposure amount E,/2 (lux/second) was fully calculated. The results are shown in Table-1.

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

This original version contains 70 g of total sodium metasilicate, 1.
．． 40m1. The sample was immersed for 1 minute in a solution consisting of 550 ml of ethylene glycol and 50 ml of ethanol, and was further washed with a water jet while lightly brushing to remove the electrophotographic photosensitive layer in the non-image areas to which toner was not attached.

When printed by a conventional method using a printing machine (model AP-1310 manufactured by Ricoh), more than 50,000 clear prints could be printed.

Examples 2 and 3 The electrophotographic plate of the present invention was prepared 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 a printing master plate and ■.

and E1/2 were measured.

The above results are shown in Table-1.

(Left below) Example 4 1 part of Abu Pigment IC 5 K, m-cresol-phenol copolymerized novolac resin (manufactured by Toden Chemical: MP-707)
) in 0.74 wt % tetrahydrofuran solution 66
7 parts were 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 van, dried at 80°C for 10 minutes, and dried to a thickness of about 0.25 van. 1
A charge generation layer of .mu.m was formed.

3-styryl- as a charge transport substance on this charge generation layer.
1.5 parts of 9-ethylcarbazole, m-cresol-phenol copolymerized Nobilac taJ resin (manufactured by Toden Chemical: M
P-707) 3.0 parts and tetrahydrofuran 120
A printing original plate for electrophotolithography of the present invention is prepared by applying a solution in which the above components are mixed and dissolved, and drying 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. did. Regarding this printing original plate, as in Example 1, ■.

and 'I/2'f: The measured results are shown in Table 2.

Next, the electrophotographic photosensitive layer of this printing original plate was immersed for about 45 seconds in a solution consisting of 25 parts of sodium silicate and 100 parts of water, and was further washed with a water jet while lightly brushing to remove the electrophotographic photosensitive layer in the non-image areas. Removed.

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 The electrophotographic plate of the present invention was prepared 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. A printing original plate was prepared, and ■ and E, /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. . I conductive support, 2... electrophotographic photosensitive layer, 3... charge generation layer, 4... charge transport layer, 5... toner image. Patent Applicant Rico Co., Ltd. - Figure 1 to Figure 2 Figure 3 Procedural Amendment (Ki) September 27, 1980 Patent Application No. 99890 2, Title 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 all of 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) (Tatashi and the person in the formula represent force and Nora residue.)