JPS60242470A - Original printing plate for electrophotographic engraving - Google Patents

Abstract

PURPOSE:To obtain an original printing plate having especially high sensitivity and high printing resitance by forming on a conductive substrate an electrophotographic sensitive layer composed of two layers of an electrostatic charge generating layer contg. an azo pigment represented by formula I and a charge transfer layer contg. a charge transfer material and an alkali-soluble resin. CONSTITUTION:The charge generating layer 3 and the charge transfer layer 4 are laminated on the conductive substrate 1 to form an electrophotographic sensitive layer 2. The layers 3, 4 may be reversely laminated. The azo pigment coupler is represented by formula I, where (A) is a coupler residue and said coupler is such as compds. having a phenolic OH, e.g., phenols and naphthols, aromatic amino copds. aminonaphthols having NH2 and phenolic OH, compds. having aliphatic ketones or aromatic phenolic ketones (active methylenes), and said coupler redidue (A) is, prefereably, selected from a specified group. The charge transfer layer is formed of the charge transfer material and the alkali- soluble resin.

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 eluating and removing the photosensitive layer of 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 a negative or a blemish from the original using silver halide film. For this reason, it requires extensive preparation and has drawbacks such as the time it takes to make the plates.

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.

Examples of printing plates for direct plate making using the electrophotographic method include JP-B No. 47-47610 and JP-B No. 4B-40.
002, Special Publication Showa 48-18325. Special Public Service 51-157
No. 66, Japanese Patent Publication No. 51-25761, a zinc oxide-resin dispersion printing plate is known. 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 wet vinyl into the photosensitive layer and conductive layer, destroying the hydrophilic layer on the surface. The printing durability was about 5,000 to io, ooo sheets.

Zinc oxide/resin dispersion printing plates still undergo dye sensitization in order to have sensitivity in the visible light region, but still do not exhibit sensitivity sufficient for practical use in the long wavelength light region of 600 nm or more. Therefore, there is a drawback that exposure cannot be performed using a low-output and inexpensive He-Ne 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-57-147656, JP-A-56-146145
, JP-A-57-161863, etc. disclose a layer consisting of an organic photoconductive compound and an alkali-soluble resin, or a phthalocyanine pigment 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 E.g. There is. 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 original plate for electrophotographic engraving, and to improve printing of specifications (no change in content), especially with high sensitivity and high printing durability. 9. To provide the original 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. General formula (1) (where A represents a coupler residue) The basic printing original plate for electrophotolithography of the present invention is characterized in that an electrophotographic photosensitive layer consisting of two layers is provided. The configuration is shown in Figure 1.

Here, ■ is a conductive support, on which charge is generated 7
13, a charge transport layer 4 is further laminated to form an electrophotographic photosensitive layer 2.

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

Reprint of the specification (no change in content) As the coupler for the azo pigment used in the charge generation layer 3,
For example, compounds with a phenolic hydroxyl group such as phenols and naphthols, aromatic amino compounds with an amino group, aminonaphthols with an amino group and a phenolic hydroxyl group, or aliphatic or aromatic enolic ketone groups (active methylene group). ) is used,
Preferably, the puller residue A is selected from the group represented by the following general formulas 01), (to), ω, (7), (b), and (4).

-x'' [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 water is a hydrocarbon ring group or a substituent thereof, engraving of the heterocyclic group specification (no change in content) or a substituent thereof, or a styryl group or a substituent thereof, R3 represents hydrogen, an alkyl group, a phenyl group, or a substituent thereof , or R2 and R3 may form a ring together with the carbon atom to which they are attached. )
] (Formula (2) and R4 in the middle represent a substituted or unsubstituted hydrocarbon group.) (The following is a blank space) Engraving of the specification (no change in content) Tag (In the formula, R5 is an alkyl group, a carbazolyl group) , carphoki, sil group, or an ester thereof, and Ar1 represents a hydrocarbon ring group or a substituted product thereof.) 6 0 6 0 (wherein, R6 represents a hydrocarbon group or a substituted product thereof, Ar
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 carbazolyl group, dibenzofuranyl group, etc., and the ring which R2 and R5 can form together with the carbon atoms to which they are bonded include a fluorene ring. Furthermore R4
Examples of the hydrocarbon group for R6 include alkyl groups such as a methyl group, ethyl group, zorobyl group and butyl group, aryl groups such as aralkylenyl groups such as benzyl group, and substituted products thereof. Substituents on the hydrocarbon group of R4 or R6 include methyl group, ethyl group,
Alkyl groups such as zorobyl group and butyl group, methoxy group,
Examples include alkoxy groups such as ethoxy group, zolodexy group, and butoxy group, halogen atoms such as chlorine atom and bromine atom, hydroxyl group, and nitro group. As a substituent in the phenyl group of R1 or in the ring of is an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, an alkoxy group such as a methoxy group, an ethoxy group, a zoloboxy group, a butoxy group, a halogen atom such as a chlorine atom, a bromine atom, a dimethylamino group, a diethylamino group dialkylamine groups, such as
Examples include a dialkylamino group such as a dibenzylamino group, a halomethyl group such as a trifluoromethyl group, a nitro group, a cyan group, a carboxyl group or an ester thereof, a hydroxyl group, a sulfonic acid group (-SO3Na), and the like. Furthermore, as the hydrocarbon ring group in Ar1 or Ar2,
Phenyl group, naphthyl group, etc., and substituents on these groups include methyl group, ethyl group, propyl group,
Alkyl groups such as butyl groups, methoxy groups, ethoxy groups,
Examples include alkoxy groups such as zoOboxy group and butoxy group, nitro group, halogen atoms such as chlorine atom and bromine atom, cyan group, dialkylamino group such as dimethylamino group and diethylamino group.

The azo pigment used in the present invention is, for example,
It is described in Publication No. 12742. Examples of these azo pigments are as follows.

(Leaving space below) Engraving of the specification (no change in content) Engraving of the specification (no change in content) Engraving of the specification (no change in the content) Engraving of the specification (no change in content) (No change to the content) 噸 噸 Engraving of the specification (No change to the content) ch 4'i4 Engraving of the specification (No change to the content) = = Around the jaw The charge generating layer 3 is an azo pigment represented by the general formula (I) Although the layer mainly consists of a binder, it can contain a binder if necessary. In this case, the proportion of azo pigment in the charge generating 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, it is also possible to use other resins as long as the proportion of the binder is small. In addition, the charge generation layer 3
The thickness is preferably 0.01 to 5 μm, more preferably 0.05 to 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 transport substances include hole transport substances and electron transport substances, and hole transport substances include, for example, 2
,5-bis(4-diethylaminophenyl)-1,,
3,4-oxadiazole, 2,5-bis[4-(4
-diethylaminostyryl)phenyl) -1,3,4
-Oxadiazole, 2-(9-ethylcarbazolyl-
3-)-5-(4-diethylaminophenyl) -1,
Oxadiazole compounds such as 3,4-oxadiazole, 2-vinyl-4-(2-chlorophenyl)-5-(
Oxazole compounds such as 4-diethylamino)oxazole, 2-(4-diethylaminophenyl)-4-phenyloxazole, 1-phenyl-3-(4-diethylaminostyryl)-5-(4-diethylaminophenyl)hirazoline, 1-phenyl -3-(4-dimethylaminostyryl)-5-(4-zomethylaminophenyl)
Nogi lazoline compounds such as pyrazoline 2'-2methyl-4,4'-bis(diethylamino)triphenylmethane, 1,1-bis(4-dibenzylaminophenyl)gulono4, tris(4-diethylaminophenyl) Diphenylmethane compounds such as methane, fluorene compounds such as 9-(4-trimethylaminobenzylidene)fluorene, 3-(9--fluorenonedene)-9-ethylcarbazole, 9-(4-diethylaminostyryl)anthracene, 9-bromine -] styryl anthracene compounds such as 0-(4-diethylaminostyryl)athracene, distyrylbenzenes such as 1,2-bis(4-diethylaminostyryl)benzene, and ■,2-his(2,4-dimethoxystyryl)benzene. Compound, 9-ethylcarbazole-3-aldehyde 1-methyl-J-phenylhydrazone, 9-ethylcarbazole-3-aldehyde 1
-benzyl-1-phenylhydrazone, 4-diethylaminobenzaldehyde 1,1-diphenylhydrazone,
2,4-nomethquine benzaldehyde l-benzyl-1
-Hydrazone compounds such as phenylhydrazone, 4-diphenylaminobenzaldehyde 1-methyl-1-phenylhydrazone, 4-diphenylaminostilbene, 4
- Stilbene compounds such as dibenzylaminostilpene and 4-ditolylaminostilbene, styrylnaphthalene compounds such as 1-(4-diphenylaminostyryl)naphthalene, 1-(4-dibenzylaminostyryl)naphthalene, 4' -diphenylamino-α-phenylstilbene, 4'-methylphenylamino-α-phenylstilbene, etc. (Dα-phenylstilbene compound, 3-
Styrylcarbazole compounds such as styryl-9-ethylcarbazole and 3-(4-diethylamino)styryl-9-ethylcarbazole are used.

Examples of electron transport substances include chloranil, bromoanil, tetracyanoethylene, tetracyanoquinone dimethane (1,2,4,7-) 1,1nitro-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, 1,3.7-1-linitrodipenzothiophene-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, isopropylphenol, t-butylphenol, and t-cresol.
-amylphenol, hexylphenol, t-octylphenol, cyclohexylphenol, 3-methyl-4-chloro-6-t-butylphenol, isozolovircresol, t-butylcresol, t-amylcresol, hexylcresol, t-octylcresol and a nobilac type resin obtained by condensing at least one substituted phenol such as cyclohexyl cresol with an aldehyde such as formaldehyde, acetaldehyde, acrolein, crotonaldehyde, and 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 exceeds 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 it will take time to elute the layer.

Not practical.

The charge transport layer 4 can contain a plasticizer.

Effective plasticizers include, for example, phthalic acid esters such as dimethyl phthalate, dimethyl 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 bimetal plate such as a copper-aluminum plate, a copper-stainless steel plate, a chrome-copper plate, or a chromium-copper-aluminum plate, a chromium-lead-iron plate. , chromium-
A conductive support with a hydrophilic surface such as a tri-metal plate such as a copper-stainless steel plate is used, and its thickness is 0.1
~1w+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. In addition, as shown in U.S. Pat. No. 2,714,006, an aluminum plate that is grained and then immersed in an aqueous sodium silicate solution, 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 sulfamic acid, or a salt thereof. It is carried out by flowing.

To produce the electrophotographic printing plate of the present invention, first, the pigment represented by the general formula (1) and, if necessary, a binder are mixed with, for example, tetrahydrofuran, dioxane, dimethylformamide, acetone methyl ethyl ketone, ethylene glycol monomethyl ether, Ethylene glycol monoethyl ether, ethyl acetate, phtyl acetate, toluene,
The coating solution is mixed in an organic solvent such as a halodanized hydrocarbon and uniformly dispersed using a dispersing means such as a sol mill or an ultrasonic dispersion machine, and then applied onto the conductive support and dried to release charge-generating atoms. establish. 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 images are created by reflective 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 laser light such as a He-Ne laser, argon laser, or semiconductor laser. 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 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, and only the toner image portion remains, allowing a good printing plate to be obtained (FIG. 3).

The eluent used here is, for example, an alkaline aqueous solution of an inorganic salt such as sodium silicate, sodium phosphate, sodium hydroxide, or sodium carbonate, an alkaline aqueous solution containing organic amines such as triethanolamine, ethylenecyamine, or the like; A solution containing an organic solvent such as benzyl 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 resist properties.

This resin component may be anything as long as it is insoluble in the eluent, such as methacrylic acid, methacrylic acid, etc.

Acrylic resin using taacrylic acid ester, vinyl acetate resin, copolymer of vinyl acetate and ethylene or vinyl chloride, vinyl chloride resin, vinylidene chloride resin, vinyl acetal resin such as polyvinyl butyral, =N
IJ styrene, copolymers of styrene and butadiene, methacrylic acid esters, etc. = ] 51J ethylene, I liprolene and its chloride, polycarbonate, polyester resin, polyamide resin, phenol resin, xylene resin, alkyd resin, wax, polyolefin , wax, etc.

The printing original plate of the present invention may also contain a quinonesoacdo compound or a cyano compound, such as 0-naphthoquinone cyanide, for the purpose of increasing the solubility of the shimiko photosensitive layer upon full-surface exposure after toner image formation.

In the original printing 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. 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 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 1 part of azo pigment A1, m-Frezi-Roof, and Nol copolymerized resin. 0.0 of lac resin (MP-707 manufactured by Gunei Chemical Co., Ltd.).
66.7 parts of a 74 wt% tetrahydrofuran solution was pulverized and mixed in a sol mill, and the resulting dispersion was mixed to a thickness of about 0.2
It was coated on a 5+mn 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-diethylaminophenyl) -1,3,4-oxadiazole 0.9 parts, 1.8 parts of styrene-maleic anhydride copolymer (copolymerization molar ratio 1:1 manufactured by Aldrich Chemical Kannoya Ni) and Tetrahydrofuran 132
A solution in which these parts were mixed and dissolved was coated and dried at 80° C. for 20 minutes to form a charge transport layer having a thickness of about 10 μm, thereby forming a printing original plate for electrophotographic engraving of the present invention.

This original printing plate was tested using an electrostatic copying paper tester (newly manufactured by Kawaguchi Denki Co., Ltd.: Model 5P-428) at -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, the surface is irradiated with light using a tungsten lamp at an illuminance of 4.5 lux, and the time taken for the surface potential to become 1/2 of vO is determined as the half-reduced exposure amount. Eμ (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.
0m1. Ethylene glycol 5! The sample was immersed in a solution of 50 ml and 150 m7I of ethanol for 1 minute, and then washed with water while gently brushing 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 manufactured by Ricoh Co., Ltd.) and printed using a conventional method, it was possible to print more than 50,000 sheets of clear printed matter.

Examples 2 and 3 Electrophotographic engraving 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. A printing original plate was prepared, and VO and Ev2 were measured.

The above results are shown in Table IK.

(Left below) Example 4 1 part of azo pigment A2, m-cresol-phenol copolymer Nogola, 0 of 7-resin (manufactured by Gunei Chemical Co., Ltd.: MP-707)
．． 74 wt% 66.7 parts of tetrahydrofuran solution?
- Pulverize and mix in a Lumir, and the resulting dispersion has a thickness of about 0.
It was coated on a 25 m grained aluminum plate and dried in one section at 80° C. to form a charge generating 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 noblack resin (manufactured by Gunei Chemical: MP-
707) A mixed solution of 3.0 parts and 12.0 parts of tetrahydrofuran was applied and heated at 80°C for 2 minutes.
A charge transporting layer having a thickness of about 10 μm was formed by drying one portion at 00° C. to prepare a printing original plate for electrophotolithography of the present invention. Regarding this printing original plate, vo and E112 were measured in the same manner as in Example 1, and the 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 of 2.5 parts of sodium metasilicate and 100 parts of water for about 45 seconds.
Furthermore, the electrophotographic photosensitive layer in the non-image area was removed by gently brushing and wiping with water.

When the printing plate thus prepared 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 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. Created the original version and V.

and Et7. was 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. FIGS. 2 and 3 are diagrams illustrating the plate-making process of the printing original plate of the present invention. FIG. 29 shows a state in which a toner image has been formed, and FIG. 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 Riko Co., Ltd. - Figure 1 Figure 2 et al. Figure 3 Procedural Amendment Document September 27, 1981 Patent Application No. 99365 2, Name of Invention Printing Original Plate for Electrophotographic Engraving 3, Relationship with 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, 1980 6
, Contents of amendment (1) Description page 1, page 5, page 6, page 7, page 8
page. 12th page, 13th page, 14th page, 15th page, 16th page,
The engraving of the chemical formula on page 17, as shown in the attached sheet (no change in content) (2) Specification The engraving of the chemical formula and border on pages 32 and 35 as in the attached sheet (no change in content)

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, the person in the formula represents a coupler residue, etc.)