JPS63144092A - Photosensitive planographic plate - Google Patents

Abstract

PURPOSE:To provide a photosensitive planographic plate comprising a surface- treated layer and a photosensitive composition and having favorable close contact properties and printing properties even through an inexpensive mechanical method, by mechanically graining the surface of an aluminum plate, etching aluminum by an acid or alkali, anodizing the etched aluminum surface, and providing thereon a photosensitive layer comprising a photosensitive diazo resin and an oleophilic high molecular weight compound having a hydroxyl group. CONSTITUTION:Mechanical graining is conducted preferably by air honing, and etching is performed by immersion in an aqueous solution of an acid or a base. The etching quantity is preferably 0.1-10g/m<2>, and then anodizing is conducted in sulfuric acid at a high current density. A photosensitive diazo resin contains at least 20mol% of a resin with (n) of at least 5 in the formula, wherein each of R1, R2 and R3 is hydrogen, an alkyl or alkoxyl, R is hydrogen, an alkyl or phenyl, X is a coupled anion, and (n) is a number of 1-200. An oleophilic high molecular weight compound is a copolymer comprising a monomer having an aromatic r aliphatic hydroxyl group as a constituent, the molecular weight thereof being ordinarily 20,000-200,000.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a photosensitive lithographic printing plate, and more particularly to a photosensitive lithographic printing plate using a mechanical roughening method for surface treatment of a support aluminum plate for the photosensitive lithographic printing plate.

[Conventional technology]

Lithographic printing is a printing method that takes advantage of the fact that water and oil essentially do not mix.The printing plate surface has two areas: one area that accepts water and repels oil-based ink, and the other area that repels oil-based ink. Ink receiving areas are formed, the former being non-image areas and the latter being image areas. The aluminum support used in lithographic printing plates has excellent hydrophilicity and water retention because its surface is used to carry the non-image area, and it also has excellent adhesion to the photosensitive layer provided on it. It is required to have excellent characteristics. For this reason, the surface of the aluminum plate is grained to create fine irregularities. This sand grain treatment includes mechanical surface roughening methods such as honing (sandblasting) pole grain, brush grain, wire grain, electric field roughening method, and the method described in JP-A-54-63902. A combination of mechanical surface roughening, electrolytic surface roughening method, and electric field surface roughening method is known, and among these methods, electric field surface roughening method has no directionality in the grain and can roughen the surface uniformly. The combination of surface roughening and mechanical surface roughening is satisfactory in printability, but it requires a large amount of electricity to roughen the surface, making mechanical surface roughening economically difficult. It's advantageous. However, with the mechanical surface roughening method, abrasives etc. dig into the surface of the aluminum plate and remain behind, resulting in the grain becoming black, the contrast between image and non-image areas becoming unclear, and printing problems. It has disadvantages in printability, such as being easily smudged. This is especially noticeable when the surface is roughened by the honing method, and in order to solve this problem, Japanese Patent Application Laid-Open No. 61-206852 proposed a method after roughening the surface.
A method of treatment with an aqueous alkaline solution is disclosed. However, when this method is applied, there is a drawback that the fine grain structure is smoothed, the adhesion of the photosensitive layer is reduced, and the printing durability is reduced.

[Problems to be solved by the invention]

In view of the above-mentioned problems, an object of the present invention is to provide a surface treatment for an aluminum support used in a photosensitive lithographic printing plate that has good adhesion and printability even when an economically advantageous mechanical method is used. An object of the present invention is to provide a photosensitive lithographic printing plate comprising a processed and photosensitive composition.

[Means to solve the problem]

The above objects of the present invention are to (a) mechanically roughen the surface of an aluminum plate, and (b) provide l! ! Or photosensitive, characterized in that aluminum is etched with an alkali, (c) anodized, and then (d) a photosensitive layer containing a photosensitive diazo resin or a lipophilic polymer compound having a hydroxyl group is applied. We have discovered what can be achieved using lithographic printing plates. Furthermore, in the present invention, the etching amount of aluminum is 0.1 to
It is preferable that the etching is carried out using an anionic surfactant and an alkaline aqueous solution, and that the lipophilic polymer compound having a hydroxyl group preferably has an aromatic hydroxyl group-1. The aluminum plate used in the present invention includes pure aluminum and aluminum alloy plate. Various types of aluminum alloys can be used. For example, aluminum alloys with gold layers such as (silicon iron, shell, manganese, magnesium, chromium, zinc, lead, bismuth, nickel, etc.) are used. !1 Mechanical surface roughening can be performed by various methods such as honing ball graining, wire graining, and brush graining, but from an industrial perspective, honing methods, especially air honing methods, are preferred. Etching of aluminum according to the invention is carried out by immersion in an aqueous solution of an acid or a base, and examples of the above-mentioned acids include sulfuric acid, persulfuric acid, hydrofluoric acid, phosphoric acid, nitric acid, and hydrochloric acid, and examples of the above-mentioned bases include: Sodium hydroxide, potassium hydroxide, sodium triphosphate, potassium triphosphate,
These include sodium flumate, sodium metasilicate, and sodium carbonate. Among these, it is particularly preferable to use an aqueous solution of the latter base because the etching rate is faster, and sodium hydroxide is particularly preferable. Further, it is preferable to include an anionic surfactant disclosed in JP-A-61-206652 in the aqueous solution, and it is particularly preferable to include flukylnaphthalene sulfonate. The content of the above a or base is 1 to 10 parts by weight, the content of anionic surfactant is 2 to 20 parts by weight, and the immersion temperature is 40 parts by weight.
The etching amount is preferably 0.1 to 100° C. Considering the adhesion between the aluminum plate and the photosensitive layer and the printing durability, the etching amount is preferably 0.1 to 100. , ~4g7m2 is particularly preferred. The anodizing treatment of the present invention can be performed by a method conventionally used in this field. Specifically, when a direct or alternating current is passed through aluminum in an aqueous or non-aqueous solution containing sulfuric acid, phosphoric acid, chromic acid, oxalic acid, sulfamic acid, benzenesulfonic acid, etc. or a combination of two or more of these, aluminum An anodic oxide film can be formed on the surface of the support. The processing conditions for anodic oxidation vary depending on the electrolyte used and cannot be determined unconditionally, but generally the electrolyte concentration is 1 to 80% by weight, the solution temperature is 5 to 70°C, and the current density is 0.
．． Appropriate ranges are 5 to 60 amperes/d12, voltage 1 to 100 V, and electrolysis time 10 seconds to 50 minutes. Among these anodic oxidation treatments, especially British Patent Nos. 1 and 4
The method of anodizing in sulfuric acid at high current density as described in US Pat. No. 12,768 is preferred. The amount of anodized film is preferably 2 to 50 x g/da2, more preferably 5 to 30 mg/da2. In order to improve the adhesion and printability of the photosensitive layer, it is preferable to further perform sodium silicate treatment after the anodizing treatment.The conditions for the silicic acid treatment include a sodium metasilicate solution with a concentration of 0.1 to 5%. Among them, it is preferable to immerse at a temperature of 50°C to 95°C for 10 seconds to 5 minutes. The photosensitive diazo resin used in the present invention includes:
For example, 7 Autograph Science and Engineering (Photo, Sci, Eng, )@
Volume 17, Page 33 (1973), U.S. Patent No. 2.063
, No. 631, No. 2゜679.498, No. 3,050,
A diazo compound and an active carbonyl compound, such as formaldehyde, acetaldehyde, or benzaldehyde, whose manufacturing methods are described in the specifications of No. 502 and JP-A-59-78340, etc., are mixed in an acidic medium such as sulfuric acid, phosphoric acid, or hydrochloric acid. A diazo resin obtained by condensing a diazo compound and a diphenyl ether derivative, the manufacturing method of which is described in Japanese Patent Publication No. 49-4001, can be used. Considering sensitivity, storage stability, and film strength, the photosensitive diazo resin used in the present invention preferably has the following general formula (1).
, and when n is 5 or more in the abdominal method, the resin is 2
In formula 0, which contains 0 mol% or more, more preferably 20 to 60 mol%, the alkyl group and alkoxy group of R2 and R1 include, for example, a furkyl group having 1 to 5 carbon atoms and 1 to 5 carbon atoms. Examples of the alkyl group of R include an alkyl group having 1 to 5 carbon atoms. General formula (1) In the formula, R1%R2 and 1/"R represent a hydrogen atom, an alkyl group or an alkoxy group, R represents a hydrogen atom, an alkyl group or a phenyl group, X represents a counter anion, and n is 1~
Shows the number 200. Such a photosensitive diazo resin can be prepared by a known method, for example, 7 Autographic Science and Engineering (Photo, Sci, Eng.) Vol. 17, No. 33.
(1973), U.S. Pat. Nos. 2,063,631 and 2,679,498, a diazonium salt and aldehydes such as paraformaldehyde, acetaldehyde,
Obtained by polycondensation with benzaldehyde. At that time, the molar ratio of diazonium salt and aldehyde is usually 1:0.6 to 1:2, preferably 1:0.7 to 1.
: Prepare at 1.5 and then at low temperature for a short time, e.g. below 10℃ 3
A highly sensitive diazo resin can be obtained by reacting for about a period of time. The counter-7 anion of the diazo resin used in the present invention is:
Containing anions that form stable salts with the diazo resin and make the resin soluble in organic solvents, these include organic carboxylic acids such as decanoic acid and benzoic acid, organic phosphoric acids such as 7enyl phosphoric acid, and sulfone Contains acids, typically
Methanesulfonic acid, chloroethanesulfonic acid, dodecanesulfonic acid, benzenesulfonic acid, toluenesulfonic acid, menthylenesulfonic acid and anthraquinonesulfonic acid, 2-hydroxy-4-methoxybenzophenone-5-
Aliphatic and aromatic sulfonic acids such as sulfonic acid, hydroquinone sulfonic acid, 4-a-7tylbenzenesulfonic acid, dimethyl-5-sulfoiso7thaleate, 2.2', 4.
4'-tetrahydroxybenzophenone, 1,2.3-
Aromatic compounds containing hydroxyl groups such as trihydroxybenzophenone, 2,2′,4-)lyhydroxybenzophenone,
Examples include, but are not limited to, halogenated Lewis acids such as hexafluorophosphoric acid and tetrafluoroboric acid, and perhalogen acids such as C10 oxide. Among these, particularly preferred are hexafluorophosphoric acid, 2-hydroxy-4-methoxybenzophenone-
5-sulfonic acid. The lipophilic polymer compound used in the present invention is as follows (1)
- Usually 2 whose structural unit is the monomer shown in (12)
Examples include copolymers with a molecular weight of ~200,000. (1) Monomers having aromatic hydroxyl groups, such as N-(4
-hydroxyphenyl)acrylamide or N-(4-
hydroxyphenyl) methacrylamide, o-1m-
1p-hydroxystyrene, o-1-1p-hydroxy722-7acrylate or methacrylate, (2) Monomers having an aliphatic hydroxyl group, such as 2-hydroxyethyl acrylate or 2-hydroxyethyl methacrylate, (3) Acrylic acid , methacrylic acid, maleic anhydride, etc., α,β-unsaturated carboxylic acids, (4) Methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, amyl acrylate, hexyl acrylate, octyl acrylate, acrylic (Substituted) fulkyl acrylates such as acid-2-chloroethyl, 2-hydroxyethyl acrylate, glycinol acrylate, N-tumethylaminoethyl 7-acrylate, (5) methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyltu tacrylate,
(ft.
alkyl methacrylate, (6) acrylamide,
methacrylamide, N-methylolacrylamide, N
-Methylol methacrylamide, N-ethyl acrylic 7
amide, N-hexyl methacryl amide, N-cyclohexyl acrylamide, N-human axyethyl acrylic amide, N-phenylacryl amide, N-nitrophenyl acrylamide, N-ethyl-N-phenylacryl amide, etc. Acrylamide or methacryl heptamides, (7) ethyl vinyl ether, 2-chloroethyl vinyl ether, hydroxyethyl vinyl ether,
Vinyl ethers such as flobyl vinyl ether, butyl vinyl ether, octyl vinyl ether, phenyl vinyl ether, (8) Vinyl esters such as vinyl acetate, vinyl chloroacetate, vinyl butyrate, vinyl benzoate, (9) Styrene, a-methylstyrene, Styrene rats such as methylstyrene and chloromethylstyrene, (10)
Vinyl ketones such as methyl vinyl ketone, ethyl vinyl ketone, propyl vinyl ketone, phenyl vinyl ketone, etc. (11) Olefins such as ethylene, propylene, imbutylene, butanoene, isoprene, etc. (12)
, N-vinylpyrrolidone, N-vinylcarbazole, 4
-Vinylbilinone, acrylonitrile, methacrylatetrile, etc. Furthermore, monomers that can be copolymerized with the above monomers may be copolymerized, and copolymers obtained by copolymerization of the above monomers may be used, for example, with glycidyl methacrylate, glycidyl acrylate, etc. It includes, but is not limited to, modified ones. More specifically, it contains the monomers listed in (1) and (2) above. A copolymer having a hydroxyl group is preferred, and a copolymer having an aromatic hydroxyl group is more preferred. The copolymer preferably contains an α,β-unsaturated carboxylic acid listed in (3), and the copolymer preferably has an acid value of 10 to 100. The preferred molecular weight of the above copolymer is 70,000 to 150,000. Furthermore, polyvinyl butyral resin, polyurethane resin, polyamide resin, epoxy resin, noporakuri (fat, natural resin, etc.) may be added to the above copolymer as necessary. The lipophilic polymer compound used in the present invention is Usually 40 to 99% by weight, preferably 50 to 99% by weight in the solid content of the photosensitive composition.
Contains 95% by weight. Further, the photosensitive diazo resin used in the present invention is usually 1 to 60% by weight, preferably 3 to 3% by weight.
Contains 0% by weight. A dye can further be used in the photosensitive composition of the present invention. The dye is used for the purpose of obtaining a visible image by exposure (exposed visible image) and a visible image after development. As the dye, a dye that changes color tone by reacting with a 7-lilanocal or an acid can be preferably used. Here, "change in tone" includes any change from colorless to colored tone, from colored to colorless, or from a different colored tone. Preferred dyes are those that change color tone by forming salts with acids. For example, Victoria Upper 1 Blue〇〇〇 [manufactured by Hodogaya Chemical Co., Ltd. 1, oil blue #603 [manufactured by Orient Chemical Co., Ltd. 1, patent pure blue [manufactured by Sumitomo Mikuni Chemical Co., Ltd.], crystal violet, brilliant green, ethyl violet, methyl Violet, methyl green, eris acin B, Paythic 7 quinone, malachite green, oil red, l-cresol purple, rhodamine B1 auramine, 4-p-noethylaminophenyliminona 7-toquinone, cya/-1)-noethyl A color changing agent that changes tri-722methane-based, diphenylmethane-based, oxanone-based, xanthine-based, iminonaphthoquinone-based, azomethine-based, or anthraquinone-based pigments, such as aminophenylacetanilide, from colored to colorless or a different colored tone. An example is given below. On the other hand, examples of color changing agents that change from colorless to colored include leuco dyes and, for example, triphenylamine, diphenyl7mine, 0-chloroaniline, 1,2,3-tri7enylguanicine, naphthylamine, and 7minono7denylmethane. , p,p'-bis-dimethylami7nophenylamine,
1,2-dianilinoethylene, 9yp', p"-) lis-dimethylaminotriphenylmethane, 9*p'-bis-tmethyl7minonophenylmethylimine, p, p'. pit-tri7minor0- methyltriphenylmethane,
p. p'-bis-methyl 7minonophenyl 4-7nili 7
Examples include primary or secondary 7-arylamine dyes such as 7-methylmethane, 9t9't9"-)lyaminotri7enylmethane. Particularly preferred are triphenylmethane and nophenylmethane dyes. More preferably, it is a triphenylmethane dye, particularly VicF Reapure Blue BOH.The above dye is usually used in a photosensitive composition preferably in an amount of 0.5 to about 10% by weight, more preferably is contained in an amount of about 1 to 5% by weight. The photosensitive composition of the present invention may further contain various additives. For example, alkyl ethers (
(e.g., ethylcellulose, methylcellulose), fluorine-based surfactants, nonionic surfactants (e.g., Pluronic L-64 (manufactured by Asahi Denka Corporation)), plasticizers to impart flexibility and abrasion resistance to the coating film. agents (e.g. butyl 7-talylur, tributyl citrate, diethyl 7-talate, butyl 7-talate, dihexyl 7-talate, dioctyl 7-talate, tricrenol phosphate, tributyl phosphate, trioctyl phosphate, tetrahydrofurfuryl oleate, acrylic) oligomers and polymers of acid or methacrylic acid),
Stabilizers [e.g., hafesterized styrene-maleic anhydride copolymer described in JP-A No. 55-527, which is added to alcohol], to improve the oil sensitivity of the image area. Phosphoric acid, phosphorous acid, organic acids (
citric acid, oxalic acid, benzenesulfonic acid, naphthalenesulfonic acid, 4-7toxy-2-hydroxybenzo-7enone-5-sulfonic acid, tartaric acid, etc.).
The amount of these additives added varies depending on the purpose of use, but is generally 0.01 to 30% by weight based on the total solid content.
%. In order to form a layer of such a photosensitive composition on a support, predetermined amounts of the above-mentioned diazo resin and, if necessary, various additives are added to a suitable solvent (methyl cellosolve, methyl cellosolve, methyl cellosolve acetate, etc.). A coating solution of the photosensitive AII composition is prepared by dissolving it in acetone, methyl ethyl ketone, methanol, trimethylformamide, trimethyl sulfoxide, water or a mixture thereof, etc.), and this is coated on a support and dried. The concentration of the photosensitive composition at the time of coating is preferably in the range of 1 to 50% by weight. In this case, the coating amount of the photosensitive composition is approximately 0.2 to
It may be approximately Log/x2. Conventional methods are applied to the photosensitive material coated on the support. That is, by exposing a transparent original image having a line image, a halftone image, etc. to light, and then developing it with an aqueous developer, a relief image of the original image can be obtained. Light sources suitable for exposure include carbon arc lamps, mercury lamps, xenon lamps, metal halide lamps, strobes, and the like. The developer used in the development of the photosensitive lithographic printing plate according to the present invention may be any of the known developers, but preferably the developer described in JP-A No. 61-91654 is preferred. The developer for developing the photosensitive lithographic printing plate according to the present invention contains a specific organic solvent, an alkaline agent, and water as essential components. After imagewise exposure, the photosensitive plain printing plate of the present invention becomes photosensitive after 10 to 60 seconds at room temperature to 40°C if it is brought into contact with the developer described above or rubbed. The photosensitive composition in the non-exposed areas of the composition layer is completely removed without adversely affecting the exposed areas of the composition layer. In this case, the developing ability is high, and the long-term developability (storage stability) and printing durability are also good, and there is no problem of dye loss or deterioration of finish, and there are no problems from the pollution and occupational health aspects. do not have.

【Example】

The present invention will be specifically explained below using Examples. First, production examples of the diazo resin, lipophilic polymer compound, and support of the present invention will be shown. (Synthesis of lipophilic polymer compound 1) N-(4-hydroxyphenyl) methacryl 7mide 10
．． Og, acrylonitrile 25g, ethyl 7cryl
) 6 (h, 5 g of methacrylic acid and 1.6421? of V7 zobisisobutyronitrile in 7 setone-methanol 1:1
After dissolving in mixed solvent 112z1 and replacing with nitrogen,
Heated at °C for 8 hours. The resulting white precipitate was filtered and dried to obtain 90 g of lipophilic polymer compound 1. When the molecular weight of this lipophilic polymer compound 1 was measured by gel permeation chromatography (hereinafter abbreviated as GPC), the weight average molecular weight was 85,000. (Synthesis of oily polymer compound 2) A mixed solution of 50.0 g of 2-hydroxyethyl methacrylate, 20 g of acrylonitrile, 25 g of methyl methacrylate, 5 g of methacrylic acid, and 1.2 g of benzoyl peroxide was heated to 100°C and mixed with ethylene glyfur. The mixture was added dropwise to 300 g of monomethyl ether over 2 hours. After completion of dropping, add 30 ethylene glycol monomethyl ether
0 g and 0.3 g of benzoyl peroxide were added thereto, and the reaction was continued for 4 hours. After the reaction is complete, dilute with methanol and add 51 ml of water.
The resulting white precipitate was collected by filtration and dried to obtain 90 g of lipophilic polymer compound 2. When the molecular weight of this lipophilic polymer compound was measured by GPC, the weight average molecular weight was 60,000 to 50,000. Synthesis of (Lipophilic polymer compound-3) Methyl methacrylate 60. , Acrylonitrile 30I?
, 10 g of methacrylic acid and 1.59 g of azobisisobutyronitrile were dissolved in methyl cellosolve zoog and polymerized at 80° C. for 4 hours while passing nitrogen through the solution. This reaction mixture was dropped into 51 water, and the resulting white precipitate was filtered and dried to obtain 70 g of Polymer 3. When the molecular weight of this polymer was measured by GPC, the weight average molecular weight was 60,000. (Synthesis of Diazo Resin-1) 14.59 (50 mmol) of p-diazodiphenylamine sulfate was dissolved in 40.9 g of concentrated sulfuric acid under water cooling. 1.5 g (50 mmol) of paraformaldehyde was slowly added dropwise to this reaction solution. At this time, the reaction temperature was 10℃
It was added so as not to exceed. Thereafter, stirring was continued for 2 hours under water cooling. This reaction mixture was added dropwise to 500xl of ethanol under water cooling, and the resulting precipitate was filtered. After washing with ethanol, this precipitate was dissolved in 100+1 pure water, and 6.8
A cold concentrated aqueous solution of 1 g of zinc chloride was added. The resulting precipitate was filtered with IIJ and washed with ethanol.
It was dissolved in 50i1 of pure water. To this liquid was added a cold concentrated aqueous solution in which 8 g of ammonium hexafluorophosphate was dissolved. The resulting precipitate was collected by filtration, washed with water, and then dried at 30°C for one day and night to obtain diazo resin-1. When the molecular weight of this diazo resin-1 was measured by GPC, it was found that it contained about 50 mol% of 61 or more molecules. (Manufacture of Aluminum Plate-1) JIS A-1100 with a thickness of 0.5xa that has been coated
The surface of the aluminum thin plate was polished using abrasive sand (trade name: Emery Extra, manufactured by Ujiden Co., Ltd.) with an average grain size of 120 mesh by an air honing method, and then washed with water to remove excess water. Next, this aluminum thin plate was treated with an etching solution having the following composition at a solution temperature of 55° C. for 20 seconds. The amount of aluminum etched at this time was 2.5y/z2. Then, after washing with water, anodize in a 40% sulfuric acid aqueous solution at 30°C for 1.58/da 2.2 minutes, wash with water, immerse in a 1% sodium metasilicate aqueous solution at 85°C for 37 seconds, and then immerse it in 90°C water (pH 8.5). The aluminum plate was immersed in water for 25 seconds, washed with water, and dried to obtain an aluminum plate-1 having a centerline average roughness Ra of 0.52μ. Etching solution〉 Water 100 parts by weight Hydroxide) IJum 3 parts by weight Sodium alkylnaphthalene sulfonate 3 parts ff1
ffls (Kao Co., Ltd. 7F Lasperex NBL) Silicone Emaruno A 0.011jftf
f5 (Unitika Environmental Technology Center Co., Ltd., Unibable 08-11) (Manufacture of aluminum plate-2) Aluminum plate-2 was prepared in the same manner as aluminum plate-1 except that no etching solution was used.
I got it. 1. Diazo resin-1 was placed on the aluminum plate-1 or -2 manufactured above. and Methylseronlup 180, a photosensitive composition consisting of 10 g of the lipophilic polymer compound shown in Table 1.
A coating solution prepared by adding the following color change agent and polyacrylic acid to a solution using m1 as a solvent was applied using a whirler. Then 85℃
The plate samples were dried for 3 minutes at a temperature of 1 to 6 to obtain photosensitive lithographic printing plate samples 1 to 6. The coating amount was 1.5 g/a2 in terms of dry ffl amount. Color change agent: Victoria Purepur-mouth OHO, 2° [manufactured by Hodogaya Chemical] Polyacrylic acid diyurimer ^C-10L o, e
,. [Nippon Junyaku Co., Ltd. Polyacrylic Acid] The obtained photosensitive lithographic printing plates 1 to 6 were exposed for 30 seconds from a distance of 60 cm using a 3KW high-pressure mercury lamp, and developed by immersing them in the following developer at 25°C for 20 seconds. Then, a lithographic printing plate sample was obtained, and [Development 81 composition] Bennol alcohol 50fI
Triethanolamine 15g Sodium sulfite 5g Butylnaphthalenesulfonic acid sorg 25g Water

Table 1 shows the results of a test of 1000g or less. 1) Visual judgment of the visibility of the image after development 62)
The printing durability test was carried out using a Huff Duster 600CDX printing machine. As shown in Table 1, the photosensitive lithographic printing plate of the present invention has excellent adhesion between the photosensitive layer and the aluminum plate, that is, printing durability, is resistant to staining during printing, and has excellent printability.

【Effect of the invention】

In accordance with the present invention, the economically advantageous W1 mechanical surface roughening process is applied to the aluminum support of the photosensitive lithographic printing plate.
T: It is important to provide photosensitive planographic printing plates with good adhesion and printability.

Claims (4)

[Claims] (1) After (a) mechanically roughening the surface of an aluminum plate, (b) etching the aluminum with acid or alkali, and (c) anodizing the surface, (d) applying photosensitive diazo resin and hydroxyl groups. 1. A photosensitive planographic printing plate coated with a photosensitive layer containing a lipophilic polymer compound. (2) Etching amount of aluminum is 0.1-10g/
The photosensitive lithographic printing plate according to claim 1, wherein the photosensitive lithographic printing plate is in the range of m^2. (3) The photosensitive lithographic printing plate according to claim 1 or 2, wherein the etching is performed using an aqueous solution containing an anionic surfactant and an alkaline substance. (4) Claims 1 to 3, characterized in that the lipophilic polymer compound having a hydroxyl group has an aromatic hydroxyl group.
3. The photosensitive lithographic printing plate according to any one of the items.