JPS60194467A - Original plate for printing - Google Patents

Abstract

PURPOSE:To obtain an original plate for printing which has good sensitivity particularly to scanning type exposure and has substantial holding time for electrification by incorporating epsilon-type copper phthalocyanine as a photoconductive material into the same layer as the layer of a photosensitive material on a base or into the layer different from the photosensitive material. CONSTITUTION:A photosensitive layer 2 consisting of epsilon-type copper phthalocyanine as a photoconductive material, o-quinone diazide as a photosensitive material, for example, positive type photosensitive material, the org. or inorg. salt of the condensated matter of p-diazo phenyl amine and aldehyde compd. as a negative type photosensitive material incorporated into a binder resin is provided on the surface of a conductive base 1 consisting of an Al plate, copper-stainless steel plate, etc. A double-layered photosensitive layer is otherwise formed by forming a layer 3 contg. the photoconductive material and a layer 4 contg. the photosensitive material with the layer 3 faced upward. An undercoating layer may be formed between the photosensitive layer and the substrate 1 to improve adhesion strength, an intermediate layer may be formed between the layers 2 and 3 and a protective layer on the photosensitive layer. After the image is exposed to said photosensitive layer, the layer is developed and is exposed over the entire surface and thereafter the layer 2 is etched with a toner image 9 as a mask, by which the lithographic printing plate having excellent durability is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a printing original plate that uses both an electrophotographic photosensitive material and a photopolymer photosensitive material I. In particular, it relates to a printing original plate suitable for short tube type exposure.

(Prior Art) Conventionally, printing master plates of the type that utilize both a photoconductive substance and a photosensitive substance are known, for example, a metal plate layer, a negative tone film, a resist layer, and a photoconductor layer on a support. An original printing plate is known in which these are arranged in this order. In order to use this printing master plate as a printing plate, first the photoconductor layer is uniformly exposed, and then imagewise exposed using light in a wavelength range to which negative photoresists are not sensitive. The latent image is developed with toner.

This toner image is heated as necessary, and then using this as a mask, the entire surface is irradiated with light in the wavelength range to which the negative photoresist is sensitive, and after curing the exposed area, the toner image and photoconductive The body layer is removed and then the uncured negative tone photoresist portions are removed.

Further, the exposed metal portion is etched, and finally the hardened resist portion is removed to create a printing plate.

Recently, examples of applying this technology to lithographic printing plates can be found in Japanese Patent Laid-Open Nos. 57-90648, 58-IFi (19fi 3, 58-162960, 58-162961, etc.). The layer structure of the printing master plate described in is similar to the printing master plate described above, except that there is no metal plate layer (,
The steps after the last etching process of the metal plate can be omitted. or,
If the photosensitive resin layer is a positive photoresist, the exposed areas are removed in the second exposure, and the toner image, the photoconductor layer, and the image area of the positive photoresist layer are removed. Form.

The original printing plates described in these publications are those in which so-called PS plates have low sensitivity, so they are made with an electrophotographic material to achieve cylinder sensitivity. It is used as a printing original plate for a so-called direct plate making system that directly obtains a printing plate by omitting the film production process.

There are two types of direct plate making systems based on the exposure method. That is, (11) a method in which a manuscript whose layout has been completed (for example, a large layout in newspaper production or a clear print) is exposed to light on a printing original plate by photographing with a camera.

(2) A method of scanning and writing, for example, a signal transmitted by facsimile, or a manuscript edited by a computer, onto an original printing plate using, for example, a laser beam.

Did you know that there are two types of seaweed?

There are differences between the above two methods in terms of the performance required of a printing original plate using electrophotography.

In other words, in the above-mentioned (1) non-light camera method, the wavelength range to which the printing original plate is sensitive is generally within the wide wavelength range of the light source used. In the case of pattern exposure, the light source is generally monochromatic light, so for example, if an Ar laser is used as the light source, Kld 4
88 nm, when using a He-Ne laser6
It is important to have a sensitive wavelength range at 32.8+By1, and it is particularly desirable that the sensitivity in these wavelength ranges be high.

From the viewpoint of this photosensitive wavelength range, it is known that phthalocyanine pigments are useful as photoconductive substances.
No. 4338, No. 5O-2773 (1st edition, JP-A-52-6)
No. 0138, No. 52-60139, No. 53-3742
No. 2, No. 57-45548, No. 57-4554fi, etc., and are used as electrophotographic materials.

Phthalocyanine pigments are also superior in terms of low toxicity, stability over time, and cost.

In addition, in the case of camera exposure, the exposure is completed in a few seconds, whereas in the case of scanning exposure (2), it takes several tens of seconds to several minutes, which is required for the plate material. Performance will vary. In other words, in general, electrophotographic materials become sensitive only after being charged, but as time passes, the amount of charge decreases.
When the amount of charge is below a certain level, there is virtually no sensitivity.

Therefore, it is necessary to carry out exposure while maintaining this sensitivity to complete toner development. Therefore, in the case of scanning exposure, the charge amount decreases slowly (the charge amount is maintained for a long time).
It is important to have C sensitivity.

Japanese Patent Publication No. 57-90648, No. 58-1!10953, No. 58-] h2960, F18-1 f'129
No. 61, etc., disclose examples of printing original plates using both an electrophotographic sensitive material and a fluorinated photosensitive material. The plate-making process for development is carried out, but Ar, He −
If the copper phthalocyanine pigments described in these publications are used in order to have sensitivity in the laser wavelength region such as N@, it will be difficult to use the above-mentioned plate-making process when using a camera exposure method or when scanning is completed in a short time even with a scanning exposure method. Although a good image can be obtained using this method, it has the disadvantage of poor processing performance -5=.

That is, the photopolymer material is fully exposed to ultraviolet light in the second exposure to cause a sufficient chemical change, that is, to make the photopolymer material sufficiently soluble in alkali. Furthermore, in the case of a negative type, a large amount of exposure is required to provide sufficient resistance to alkali, which requires a long second exposure time or a high-energy light source.

If you try to avoid these things and carry out the next elution step with an insufficient second exposure, if the photopolymer material is positive, the non-image areas will not be sufficiently soluble in alkali. , it is necessary to use a highly concentrated and/or high temperature alkaline solution or to prolong the immersion time in the alkaline solution. In addition, when the photopolymer material is a negative type, there is a problem that the non-image area is not sufficiently cured, so it may be removed together with the image area due to elution, or a defect may occur in a part of the image. have.

Further, when a long time is required for scanning exposure, the charged 6- potential is attenuated and the actual sensitivity is lowered, resulting in a disadvantage that a good image cannot be obtained.

The present inventor has developed a printing plate that uses both an electrophotographic sensitive material and a photopolymer sensitive material, which has a laser-sensitive area, has electrophotographic sensitivity for a relatively long time, and has excellent processing properties. We conducted extensive research on the printing plate and developed the present invention. Improvement in processability here refers to shortening the time required to finally obtain a printing plate or easing the processing conditions.

More specifically, it is possible to reduce the required exposure amount or shorten the elution time in the final step of the plate-making process of Teiho → imagewise exposure → toner development → fixing → full-face exposure → elution. This refers to shortening, reducing eluate concentration, or reducing elution temperature.

(Objective of the Invention) The object of the present invention is to improve the processability of a printing original plate using both an electrophotographic sensitive material and a photopolymer sensitive material, and another object is to improve the processability of a printing original plate using a combination of an electrophotographic sensitive material and a photopolymer sensitive material. Our goal is to provide printing plates with excellent paulownia resistance.

The object of the present invention is a printing plate having one or more layers on a support containing a photoconductive substance and a photosensitive substance, either in different layers or in the same layer.

This is achieved by a printing original plate containing ε-type steel phthalocyanine as the photoconductive material.

In the printing original plate described above, the support has two or more image forming layers, and the photoconductor layer containing a photoconductive substance is provided above the photosensitive layer containing a photosensitive substance. Embodiments are preferred over embodiments containing the photoconductive material and the photosensitive material in the same layer.

In the present invention, when a photosensitive substance and a photoconductive substance are contained in different layers, it is necessary that the photosensitive layer containing the photosensitive substance is located below the photoconductor layer containing the photoconductive substance. . Specifically, the layer structure is formed in the order of the support photosensitive layer and the photoconductor layer. This is even larger than when both are included in the same layer, and the required exposure l' is smaller when the entire surface is exposed.

The ε-type copper phthalocyanine used in the present invention has an X-ray diffraction angle (2θ) of approximately 11.63.
．． 72, 6.24, 5.10, 4.35, 4.
19.

3.87, 3. :46, 3.28, 3.19, and 3.03λ copper phthalocyanine exhibiting a corresponding spacing spectrum, which is disclosed in U.S. Patent No. 3,510.7F.
No. 1, West German Patent No. 1.181.248, Tokukosho, 10
-2780, JP-A-48-76925, JP-A-49-5
It can be manufactured by the manufacturing method described in various publications such as No. 9136 and Japanese Patent Publication No. 57-35210.

Photosensitive materials that can be used in the present invention: Both positive-type and negative-type photosensitive materials can be used.

As a positive photosensitive material, a photo-soluble material or a depolymerized photo-sensitive material can be used alone or in combination with an alkali-soluble resin, but among these, the most commonly used is 0-quinone diazide. It is a compound.

9- Examples of negative photosensitive substances include photodimerizable compounds, photodegradable compounds, and photopolymerizable compounds, and among these, particularly useful compounds are those described in US Pat. No. 2.714. (No. 166, No. 2 + 82 h + 5 O January, British Patent No. 1,074,392, Japanese Unexamined Patent Publication No. 1983-33907, No. 57-118239 Katana-14Ft 7-19 Fl 2
No. 511, No. 58-2834, F1B-2847
Although the diazo compounds and diazo resins described in various publications such as No. 1, etc., are included, the most commonly used is an organic or inorganic salt of a condensate of p-diazodiphenylamine and an aldevide compound.

As the binder resin for the photoconductive substance or photosensitive substance used in the present invention, hydrocarbon polymers such as folystyrene, snalene-butadiene co-merged, polyisobutyrene; polyvinyl chloride, chlorinated polyethylene, chlorinated polychloride are used. Vinyl resins such as vinyl, polyvinyl acetate, polyvinyl acetal, polyvinyl butyral, and polyvinyl ether; homopolymerization of esters of maleic acid, crotonic acid, acrylic acid, methacrylic acid, acrylic acid, and methacrylic acid.
Acrylic resins such as O- bodies or their mutual copolymers, or copolymers of Kojiri et al. and other vinyl monocapsules, or modified products of these combinations; silicone resins; phthalic acid resins;
Malene r! & Alkyd resin consisting of a silk compound of porridge or other polybasic acid and polyol; Polyamide resin; Polyurethane; Phenol resin; Urea resin; Amino resin such as melamine resin; Epoxy resin; Cellulose ether, fiber Cellular resins such as base esters; polycarphonates; modified or unmodified rosin, resins that are a mixture of two or more glazes, such as natural resins such as balsam, can be used; however, in order to have alkaline solubility, all resins are Approximate amount)
It is preferable that 1% or more be a phenol resin, or an acid group-containing resin such as an acrylic acid resin or a maleic acid resin.

The printing original plate according to the present invention can be manufactured by the following method.

(a) When a photosensitive substance and a photoconductive substance are contained in the same layer.

A predetermined amount of soluble components such as a binder resin and a photosensitive material are dissolved in a solvent that dissolves the binder resin BFi and a photosensitive material, and after filtering as necessary, a predetermined amount of ε-
A poorly soluble substance such as copper phthalocyanine is added to the bath solution VCC prepared above. This solution is made into a homogeneous dispersion using a known dispersing machine such as a ball mill, colloid mill, or sand glider.

A photosensitive layer may be formed by surface coating this dispersion onto a support, but in order to improve adhesion, etc., a subbing layer may be added between the photosensitive layer and the support to protect the surface and provide water resistance. For improvement, etc., a surface layer may be provided on the photosensitive layer, or both an undercoat layer and a surface layer may be provided.

(b) When the photosensitive substance and the photoconductive substance are contained in separate layers.

A composition is prepared by dissolving a binder resin and a photosensitive substance in a solvent in accordance with the above procedure, and this is applied onto a support and dried to form a photosensitive layer. On top of this layer, a binder resin is dissolved in a solvent. A composition containing ε-type copper phthalocyanine dispersed therein is applied and dried.

In addition, an undercoat layer is provided between the support and the photoconductive layer, and a subbing layer is provided between the photosensitive layer and the photoconductive layer to prevent mixing of the photosensitive material and the photoconductive material, and to improve adhesion. If necessary, an intermediate layer may be provided between the photoconductor layer and a surface layer may be provided on the photoconductor layer.

Next, the present invention will be explained with reference to the drawings. Figures 1 to 4 σ illustrate embodiments of the present invention, and Figure 1 shows a layer (2) containing a photoconductive substance and a photosensitive substance provided on a support (1). FIG. 2 shows a printing original plate having a photosensitive layer (4) containing a photosensitive substance on the support (11) and a photoconductor layer (3) containing a photoconductive substance on the support Wj. FIG. 3 shows a printing original plate provided with a protective layer (5) on layer (2), in addition to the structure shown in FIG.
2) and a support (11), a printing original plate in which a conductive subbing layer (6) is provided; FIG. 4 shows the structure shown in FIG. There is a storage layer (5) on top, a subbing layer (6) between the photosensitive layer (4) and the support (11), and an intermediate layer between the photoconductor layer (3) and the photosensitive layer (4). This is a printing original plate having a layer (7).

In the present invention, it is also possible to use a sensitizer in combination with the e-type steel phthalocyanine, and examples of these sensitizers include carbazole, N-ethylcarbazole, N-inpropylcarbazole, N- Phenylcarbazole, tetraphenylpyrene, 1-methylpyrene, anothracenetraphene, 2-phenylnaphthalene, asapyrene,
Hole transfer materials such as fluorene, fluorenone, 11-ethylpyrene, acetylpyrene, 2,3-benzochrysene, 3,4-benzopyrene, 1,4-bromopyrene, and hyphenylindole, polyvinylcarbazole, polypyrene, polyvinyltetracene or 2.4.7
- Electron transfer substances such as dolinitrofluorenone, 2.4.5.7-tetranitrofluorenone, dinitroanthracene, dinitroacridine, tetracyanopyrene, and dinitroanthracene; xanthine dyes such as rosebencal, eosin S1 fluorescein, and phloxine; bromophenol Phenolsulfophthalein dyes such as blue, bromcresol per 7'lv, and ri-O-lophenol red; triphenylmethane dyes such as Alphazurin 2G, Bontasil Brilliant Blue FCF, and Acid Violet 6B; diphenylmethane such as auramine Acridine dyes such as acridine yellow and acridine orange; 11-tamin yarn dyes such as sulforodamine B and acid eosin G; benzoic acid, phthalic acid,
Examples include organic carboxylic acids such as maleic acid, fumaric acid, maleic anhydride, and phthalic anhydride, and their anhydrides.

Supports used in the printing original plate of the present invention include aluminum plates, zinc plates, iron plates surface-treated with chrome plating, or bimetal plates such as copper-aluminum plates, copper-stainless steel plates, chrome-copper plates, etc. Alternatively, a conductive substrate having a hydrophilic surface such as a trimetal plate such as a chromium-copper-aluminum plate, a chromium-lead-iron plate, a chromium-steel-stainless plate, etc. is used, but especially after the surface is treated with a grain chamber, After performing hydrophilic treatment such as anodization, silicate,
An aluminum plate that has been immersed in an aqueous solution of phosphate or fluorinated zirconate and sealed is preferably used.

The composition and thickness of the layers of the printing original plate of the present invention can be determined according to conventional methods.

The printing original plate of the present invention has the layer structure shown in FIG.
An example of a process for manufacturing a lithographic printing plate from a printing original plate when the photosensitive material is a positive type will be described with reference to FIG.

Figure 5 (a1 step) The surface of the VC layer (2) is charged by a known method. Next, in the (II+) step, image exposure is performed to remove the charge in the non-image area. Next, the (c) step Toner development is carried out in step 1, and toner (8) is applied to the image area.

Next, it is fixed in the (dl step) to form a toner image (9). However, if a toner with self-fixing properties is used, this step can be omitted. Then, in step (f), the photosensitive layer (2) in the non-image area is eluted and removed using an alkaline solution.After this, the photosensitive layer (2) in the image area and the toner image (9) are used as a resist. The support (1) is etched using an etchant, and then the photosensitive layer (1) in the i1!j image area is etched.
2) and toner 1#f91 can be removed to produce a flat U plate.

In addition, when the printing original plate of the present invention has the layer structure shown in FIG. 1 and the photosensitive material is a negative type, an example of the process of manufacturing a lithographic printing plate from the printing original plate will be described below. This will be explained with reference to FIG.

This process is the same as shown in FIG. 5 from charging to forming a toner image. After that, the entire surface is exposed in the GL process shown in FIG. 9) and remove.

When manufacturing a printing plate using the printing original plate of the present invention, the alkaline solution that can be used as an eluent after full exposure to ultraviolet rays is a solution of an inorganic and/or organic alkaline substance in water and/or an organic solvent. can.

Inorganic alkaline substances and substances, ammonia, alkali metal and alkaline earth metal hydroxides, such as ammonium hydroxide, sodium hydroxide, potassium hydroxide, calcium hydroxide, strontium hydroxide, and alkali phosphates, Examples include sodium 17-thorium phosphate, potassium phosphate, and alkali silicates such as sodium silicate and potassium silicate.

Organic basic compounds include primary, secondary and tertiary such as trimethylamine, ethylamine, diethylamine, triethylamine, globylamine, butylamine, isobutylamine, cyphthylamine, trifusylamine, diisobutylamine, octylamine, diethylamine. lower saturated amines, furthermore piperidine, N-methyl-hyperidine, N-ethylpiperidine, morpholine,
Amino alcohols such as nuethanolamine, jetanolamine, triethanolamine, N-methylgetanolamine, N-ethyl-getanolamine, diamines and hyperpolyamines such as nuethylenediamine, diethylene-triamine, triethylene-tetramine, This particularly applies to lower substituted amides such as dimethylformamide.

Water and/or organic solvents can be used as solutions for dissolving and diluting these alkaline substances, but organic bath agents and ethers such as dibutyl ether, ethyl butyl ether, diisopropyl ether, dioxane and tetrahydrofuran can lower ketones such as acetone, methyl ethyl ketone, diglobir ketone; lower esters such as methyl acetate, ethyl acetate, butyl acetate, 70 methyl pionate, methyl butyrate, ethyl acetate, and methanol, ethanol, propatool, isopropanol, imbutanol, ethylene glycol,
Examples include solvents containing alcohol groups such as polyethylene glycol IJ col, briselin, ethylene glycol 7-methyl ether, ethylene glycol 7-methyl ether, ethylene glycol monophenyl ether, benzyl alcohol, and phenethyl alcohol.

Hereinafter, the present invention will be specifically explained with reference to Examples.

Example-1 An aluminum plate grained by electrolytic polishing in a hydrochloric acid bath with a thickness of about 0.3 mm was anodized in a sulfuric acid bath to a thickness of about 2.89 mm/cm.
An oxide film of 7yL" was formed, washed with water, and dried. A dispersion prepared according to the following formulation was uniformly applied using a wire bar and dried.

1.0g 2- and droxyethyl methacrylate 9.0.9 Methyl cellosolve 70.9 M) Dissolve the pF6 salt of the condensate of 1dp-diazodiphenylamine and paraformaldehyde and 2-hydroxyethyl methacrylate in methyl cellosolve. After filtration, Lionol Blue-ER was added and glass beads were dispersed for 1 hour to obtain a dispersion. Further, the coating was carried out so that the dry film thickness was approximately 6 μm.

Example-2 An aluminum plate grained by electropolishing in a nitric acid bath with a thickness of 0.311 was anodized in a phosphoric acid bath to a thickness of about 2.5
An oxide film of 9/m was formed, washed with water, dried, and then a dispersion prepared according to the formulation described in 1 was uniformly applied using a roll coater and dried.

A sulfonic acid ester compound of a phenol resin having the following structural formula and O-naphthoquinonediazide (esterification rate: 33%) A phenol resin H, C-C-CH- having the following structural formula.

CIi.

Dissolve the two components in ethyl cellosolve 7 (1,9),
To the filtered filtrate, add Liophoton manufactured by Toyo Ink Co., Ltd.
E K (ε-type copper phthalocyanine) 3.09 was added and glass beads were dispersed for 1 hour to obtain a dispersion. The coating was carried out so that the dry film thickness was 6.0 μm VC.

Example-3 Acrylic acid resin having the following structural formula ((note) suffix indicates mo1%) s, og average molecule 1 600 o.

Methyl cellosolve 70. To the filtrate dissolved in lil and filtered, Lionol -Blue - manufactured by Toyo Ink Co., Ltd.
ERP C (ε-type steel phthalocyanine) 4.09 was added and dispersed in a ball mill for u hours to obtain a dispersion. This dispersion was coated onto an aluminum plate treated in the same manner as that used in Example 2 using a roll coater so as to have a dry film thickness of 6.0 μm, and dried.

Example-4 Sulfonic acid ester compound of phenol resin having the following structural formula and 0-naphthoquinonediazide (esterification rate 25%) 0■ Phenol resin average molecule having the following structural formula -[120004,0,@n:m :n bilayer: 3:1 was dissolved in 660 g of ethyl cellosolve acetate and filtered to add Lionol-Blue manufactured by Toyo Ink Co., Ltd.
After adding 40 g of -ER (ε-type copper phthalocyanine), glass beads were dispersed for 1 hour to obtain a dispersion.

This dispersion was grained to a thickness of 0.3 tnm using Yokaiken # in a hydrochloric acid bath, and then oxidized in a phosphoric acid bath to a thickness of about 2.7 tnm.
The coating was applied and dried using a wire bar on an aluminum plate provided with an oxide film of fJ/rrt so that the dry film thickness was 7.0 μm.

Example-5 A resorcinol resin having the following structural formula.

- Sulfonic acid ester with naphthoquinone diazide A phenolic resin having the following structural formula was dissolved in 60 g of ethyl cellosolve, filtered, and Ljophoton -EK (ε-type-strand phthalocyanine) manufactured by Toyo Ink Co., Ltd.4. Ofl was added, and the mixture was dispersed using a ball mill V trowel to obtain a fractional liquid. This portion IS was spread on an aluminum plate treated in the same manner as in Example 4 using a roll coater so that the dry film thickness was 6.0 μm, and then dried.

Example-6 2.0 g of 15,0,9 5-nitroacenaphthene was dissolved in a mixed solvent of 10 g of 2-butanone and log toluene, and after filtration, Llonol (manufactured by Toyo Ink Co., Ltd.) was dissolved.
-Blue -KRPC (g-type-copper phthalocyanine)
After adding 5.0 g, dispersion was performed for 1 hour using glass beads to obtain a dispersion. This dispersion was applied onto an iron plate that had been chromium plated and treated with a carboxymethylene cellulose solution using a wire bar so that the dry film thickness was 5.0 μm, and then dried.

Example 7 The following photosensitive solution A was first applied to a dry film thickness of 3.5 mm on an aluminum plate treated in the same way as that used in Example 1.
It was applied so that it was μmK.

Next, dispersion A having the following composition was applied onto this layer to a dry film thickness of 3.51 Lm, and dried.
A paulownia original plate consisting of two +7 μm layers was obtained.

Example 8 Photosensitive liquid B and dispersion liquid B prepared according to the following method were coated on an aluminum plate that had undergone the same treatment as that used in Example 2.

Photosensitive liquid B A phenolic resin having the following structural formula. - Sulfonic acid ester compound with naphthoquinone diazide (esterification rate: 5%) A photosensitive liquid prepared by dissolving a phenol resin having the following structural formula in 60 g of ethyl cellosolve.

*Screening B A phenol resin having the following structure was dissolved in ethyl cellosolve 5 (3 g), filtered, and after adding Liopoton-EK (ε type-copper cap O'i 7-nin) 5.G 9 manufactured by Toyo Ink Co., Ltd. A dispersion liquid in which glass beads were dispersed for 1 hour.

Coating starts with VC on the support and VC photosensitive solution B is applied to a dry film thickness of 30 mm.
After drying, dispersion B was applied onto this layer to a dry film thickness of 3() μm to obtain a printing original plate having two layers with a total thickness of 6.0 μm.

Comparative Examples 1 to 8 Comparative Examples 1 to 8 d) Cf'I Corresponding to Examples 1 to 8, respectively, VC for the ε type steel phthalocyanine not used in Examples 1 to 8] Phthalocyanine shown in the table below Printing original plates of Comparative Examples 1 to 8 were prepared in the same manner as in Examples 1 to 8, using the following.

In addition, as a comparative example, phthalocyanines other than those described above were also investigated, but all of them had extremely low sensitivity and caused problems such as background smearing, and none of them could be suitably used.

Other phthalocyanine Irga studied as a comparative example
zlne-Blue-3GT (metal-free phthalocyanine manufactured by Inu Nippon Ink Co., Ltd.) Examples 1 to 8 and Comparative Examples 1 to 8
After uniformly charging the plate surface positively or negatively using a corona machine, a He-Ne laser beam with a plate surface illuminance of 2 mW was used as a light source to scan a flat surface that required 4 minutes to scan the entire surface. When toner was developed after imagewise exposure using a scanning laser exposure machine, good toner images were obtained for Examples 1 to 8, but good toner images were obtained for Comparative Examples 1 to 8. ll images were obtained, but in Comparative Examples 1 to 8, the attenuation of the charge amount was large, and -29 = first image area and non-image area 1#! Only toner images with poor contrast could be obtained.

Next, after the printing plates of Examples 1 to 8 and Comparative Examples 1 to 8 were uniformly charged positively or negatively using Corona Teiden, the illumination intensity on the plate surface of the portion corresponding to the white background of the manuscript was 6
When imagewise exposure was carried out using a camera-type exposure machine (Lux) with an exposure time of 5 seconds, and toner development was carried out, good toner images were obtained in all cases.

Incidentally, toner development was carried out in Examples 2 and 4 and Comparative Example 2.4 using a far plan method using dry toner, and in the other cases using a developing machine equipped with a lithographic slint type developing electrode using liquid toner.

The photosensitive layer was developed with a dry toner and then fixed by heating, and then fixed using the self-fixing property of the liquid toner. The exposure time was set.

The photosensitive layer is positive type (Example-2, 4°5.8, Comparative Example-2
, 4, 5, 8), the exposure time required for the non-image area to be completely eluted by elution based on constant alkaline elution conditions after full-surface exposure, and the negative type. (Example-1, 3, fi, 7, Comparative example-1゜3.6
．． In the case of 7), the exposure time required for the non-image area to become a suitable resist due to alkali elution after full exposure and exhibiting alkali resistance was experimentally determined, and the results shown in Figure 1 were obtained. .

Table 1: The following eluate was used: 3. Developer solution for positive PS plate manufactured by Konishiroku Photo Industry Co., Ltd. DP-1 Example-6 and Comparative Example-6 Negative PS plate manufactured by Konishiroku Photo Industry Co., Ltd. Plate developer DN-21 From the above experimental results, the printing original plate according to the present invention has a shorter required exposure time than the printing original plate of the comparative example.
In particular, the difference was more remarkable in the single-layer type.

(Effects of the Invention) According to the present invention, the amount of exposure required for the entire surface exposure in the plate making process is reduced, thereby improving processability. In the case of scanning exposure using a laser or the like, image defects due to potential attenuation can be improved. Furthermore, the printing original plate of the present invention has excellent storage stability and printing durability.

[Brief explanation of drawings]

FIGS. 1, 2, 3, and 4 are diagrams showing the outline of the structure of embodiments of the printing original plate of the present invention. FIGS. 5 and 6 are diagrams for explaining the process of manufacturing a lithographic printing plate using the uninvented printing original plate. In the figure: 1... Support, 2... Layer containing a photoconductive substance and a photosensitive substance, 3... Photoconductor layer, 4... Photosensitive layer, 5... Protective layer, 6... Subbing layer, 7... Intermediate skin, 8... Toner, 9... Toner image agent 5f burial field 1) Parent-O- Figure 1 Figure 5 Figure 2 (b ) to) Figure 3 [γ μヰ

Claims (1)

[Claims] A printing original plate having at least one layer containing a photoconductive substance and a photoconductive substance in different layers or in the same layer on a support, comprising C-type copper phthalocyanine as the photoconductive substance. Characteristic printing box original plate.