JP2009241303A - Treatment method for lithographic printing plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treatment method which enables a favorable ink accepting property to be stably imparted to a lithographic printing plate utilizing a silver complex salt diffusion transfer method which has a physical development core between an anodized aluminum substrate and a silver halide emulsion layer. <P>SOLUTION: This lithographic printing plate utilizing the silver complex salt diffusion transfer method has the physical development core between the anodized aluminum substrate and the silver halide emulsion layer. After exposing and developing the lithographic printing plate, the lithographic printing plate is treated with a plate surface treating liquid containing at least one kind of a compound of an anionic interfacial active agent which is represented by a following general formula, and a triazine having two or more mercapto groups or its substituted derivative in the treating method for the lithographic printing plate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for processing a lithographic printing plate using an aluminum plate as a support and utilizing a silver complex diffusion transfer method.

  For lithographic printing plates using the silver complex diffusion transfer method (DTR method), published by Focal Press, London New York (1972), by Andre Lot and Edith Weide, "Photographic Silver Halide Diffusion Processes" Some examples are described on pages 101-130.

  As described therein, the lithographic printing plate using the DTR method includes a two-sheet type in which a transfer material and an image receiving material are separately provided, or a mono-sheet type in which they are provided on a single support. Two methods are known. The two-sheet type lithographic printing plate is described in detail in JP-A-57-158844. The monosheet type is described in detail in Japanese Patent Publication No. 48-30562, Japanese Patent Publication No. 51-15765, Japanese Patent Publication No. 51-111103, Japanese Patent Publication No. 52-150105, and the like.

  A monosheet type lithographic printing plate (hereinafter referred to as an aluminum lithographic printing plate) using a silver complex diffusion transfer method using an aluminum plate as a target of the present invention as a support is disclosed in JP-A-57-118244, JP-A-57-158844, JP-A-63-260491, JP-A-3-116151, JP-A-4-282295, US Pat. No. 4,567,131, US Pat. , 427,889 and the like.

  The aluminum lithographic printing plate has a structure in which a physical development nucleus is supported on a roughened and anodized aluminum support, and a silver halide emulsion layer is further provided thereon. A general plate-making method of this lithographic printing plate comprises steps of development, washing (wash-off: removal of silver halide emulsion layer), and finishing after exposure.

  Specifically, a metallic silver image portion is formed on the physical development nuclei by the development process, and the silver halide emulsion layer is removed by the subsequent washing treatment, and the metallic silver image portion (hereinafter referred to as a silver image portion) is formed on the aluminum support. The anodized aluminum surface itself is exposed as a non-image area.

  The exposed silver image area and non-image area are coated with a finishing solution containing a protective colloid such as gum arabic, dextrin, carboxymethyl cellulose, polystyrene sulfonic acid, etc. for protection. A so-called gumming process is performed.

  As a development processing apparatus for the above-described aluminum lithographic printing plate, a development processing apparatus (hereinafter referred to as an immersion development method) in which a large amount of developer is stored in a tank and a lithographic printing plate is inserted into the tank has been conventionally known. Yes. In such an immersion type processing apparatus, the developer deteriorates due to processing fatigue accompanying processing of the photosensitive material or fatigue with time due to carbon dioxide gas or oxygen in the atmosphere. Therefore, by adding a replenisher to the developer, The deterioration is restored.

  On the other hand, as photosensitive material processing apparatuses, for example, JP-A-62-237455, JP-A-6-8956, JP-A-6-27677, JP-A-2001-174970, and JP-A-2001-312036. As described in the above, instead of immersing the photosensitive material in the developing solution, a developing-type developing processing apparatus that applies processing to the photosensitive surface of the photosensitive material as much as necessary for processing the photosensitive material and performs processing. It has been known. The advantage of using a coating type development processing apparatus is that the amount of developer to be used is small, and there is no circulating use of the developer, and development can always be performed with a constant developer composition.

  Various compounds are used for the purpose of enhancing the performance of the aluminum lithographic printing plate in the developer, washing solution and finishing solution used in these development processing apparatuses. For example, a lipophilic agent (for example, a nitrogen-containing heterocyclic compound having a mercapto group or a thione group) is generally used for the purpose of increasing the ink acceptability of the silver image area, and inorganic for the purpose of increasing the hydrophilicity of the non-image area. In general, an organic acidic substance or a hydrophilic polymer is used, but it is necessary to impart higher hydrophilicity in order to obtain a good printed product free from ink stains in printing a large number of sheets.

  Conventionally, in a processing method of an aluminum lithographic printing plate, imparting high hydrophilicity with a washing solution or a finishing solution has a problem of significantly reducing the lipophilicity of a silver image portion. In order to improve both of the hydrophilicity in a well-balanced manner, its function is greatly limited. Therefore, for many years, a method for dramatically improving the lipophilicity of the silver image portion has been eagerly desired in order to impart high hydrophilicity.

  As one method for achieving the above object, in Japanese Patent Application Laid-Open No. 2003-295473 (Patent Document 1), an aluminum lithographic printing is performed for the purpose of preventing a decrease in ink depositing property of an image portion that occurs when a large number of sheets are printed. After exposing and developing the plate, an amine compound having a propyleneoxy group and an ethyleneoxy group, an aliphatic amide compound having a propyleneoxy group and an ethyleneoxy group, and a quaternary ammonium compound group having a propyleneoxy group and an ethyleneoxy group At least one selected compound, a triazine having two or more mercapto groups or a substituted derivative thereof, or a monomercapto nitrogen-containing heterocyclic compound having no aliphatic group and aromatic group and having a primary amino group A processing method of a lithographic printing plate that is processed with the plate surface processing liquid contained is described.

However, in the above method, the effectiveness can be expressed only under limited conditions among various printing conditions such as water supply mechanism and etchant of various printing presses, and ink types in recent years. For curable inks (hereinafter referred to as UV inks), since a large number of printing waste papers are required from the start of printing until a good printed matter is obtained, it is possible to stably give good ink acceptability. There was a need for a processing method for lithographic printing plates.
JP 2003-295473 A

  An object of the present invention is a processing method of a lithographic printing plate using a silver complex diffusion transfer method having a physical development nucleus between an anodized aluminum support and a silver halide emulsion layer, which affects printing conditions. An object of the present invention is to provide a processing method for a lithographic printing plate that can stably give good ink acceptability. In particular, an object of the present invention is to provide a lithographic printing plate processing method suitable for UV ink.

  The above-mentioned problem of the present invention is that the lithographic printing plate using the silver complex diffusion transfer method having a physical development nucleus between the anodized aluminum support and the silver halide emulsion layer is exposed and developed, and then the following general The present invention has been achieved by a processing method of a lithographic printing plate which is processed with a plate surface processing solution containing at least one compound of an anionic surfactant represented by the formula and a triazine having two or more mercapto groups or a substituted derivative thereof. .

In the formula, R represents an alkyl group having 1 to 20 carbon atoms, X represents a hydrogen atom, an alkali metal or NH ₄ , m represents an integer of 1 to 5, and n represents an integer.

  Providing a processing method for a lithographic printing plate that can stably give good ink acceptability without being affected by various printing conditions by using the processing method for a lithographic printing plate shown in the present invention can do. In particular, a lithographic printing plate processing method suitable for UV ink can be provided.

  The plate surface processing solution used in the present invention is a processing solution applied after development processing with a developing solution. Specifically, the washing solution used in the washing treatment process carried out after the developing treatment with the developing solution, the finishing solution used for the purpose of protecting the anodized layer of the aluminum support after the washing treatment step, and further printing start This is the case for the starter liquid previously applied to the printing plate.

In the anionic surfactant represented by the above general formula contained in the plate surface treatment liquid of the present invention, R represents an alkyl group having 1 to 20 carbon atoms, X represents a hydrogen atom, an alkali metal or NH ₄ , and m represents An integer of 1 to 5, n represents an integer. As the alkali metal, potassium salt, sodium salt and the like are preferably used, but there is no particular limitation. Moreover, the said C1-C20 alkyl group may have substituents, such as an allyl group, an aryl group, an alkoxy group, an aryloxy group, and a halogen group.

  Specific examples of the anionic surfactant represented by the above general formula include polyoxyethylene-n-butylphenyl ether sulfate and its salt, polyoxyethylene-tert-butylphenyl ether sulfate and its salt, polyoxyethylene octyl Phenyl ether sulfate and salts thereof, polyoxyethylene nonyl phenyl ether sulfate and salts thereof, polyoxyethylene dodecyl phenyl ether sulfate and salts thereof, polyoxyethylene hexadecyl phenyl ether sulfate and salts thereof, polyoxyethylene stearyl phenyl Ether sulfates and salts thereof, polyoxyethylene tetradecylphenyl ether sulfates and salts thereof, polyoxyethylene-2-ethylhexylphenyl ether sulfate And its salts, polyoxyethylene-2-butyloctylphenyl ether sulfate and its salts, polyoxyethylene-2-amylnonylphenyl ether sulfate and its salts, polyoxyethylene-n-propylheptylphenyl ether sulfate and Examples thereof include salts thereof, polyoxyethylene monostyryl phenyl ether sulfate and salts thereof, polyoxyethylene distyryl phenyl ether sulfate and salts thereof, and polyoxyethylene tristyryl phenyl ether sulfate and salts thereof. Among them, polyoxyethylene monostyryl phenyl ether sulfate and its salt, polyoxyethylene distyryl phenyl ether sulfate and its salt, polyoxyethylene tristyryl phenyl ether sulfate and its salt are preferable.

  These anionic surfactants include, for example, Emar NC-35, Lebenol WZ (manufactured by Kao Corporation, all trade names), Nonipol S-40 (manufactured by Sanyo Chemical Industries, Ltd., all trade names), Hightenol N-08, Hightenol N-08, Hightenol N-17, Hightenol NE-05, Hightenol NE-15, Hightenol NF-08, Hightenol NF-0825, Hightenol NF-13 (first Manufactured by Kogyo Seiyaku Co., Ltd., all trade names), Sunnol NP-2030, Sunnol OP-2630, Sunnol NP-1530, Sunnol NP-1930, Sunnol NP-6130, Sunnol OP-3330 (manufactured by Lion Corporation) These are commercially available under the trade name), etc., and these can be obtained and used.

  The addition amount of the anionic surfactant contained in the plate surface treatment liquid used in the present invention is not particularly limited, but is preferably 0.5 to 100 g, more preferably 1 to 50 g per liter.

  Specific examples of triazine or a substituted derivative thereof containing two or more mercapto groups used in the present invention include, for example, thiocyanuric acid, 2,4-dimercaptotriazine, 2,4-dimercapto-6-dibutylaminotriazine, 2, Examples include, but are not limited to, 4-dimercapto-6-phenylaminotriazine, 2,4-dimercapto-6-benzyltriazine, and the like.

  Although there is no particular limitation on the amount of triazine or a substituted derivative thereof containing two or more mercapto groups contained in the plate surface treatment solution used in the present invention, it is preferably 0.1 to 20 g per liter, more preferably 1. 0-10g.

  The plate surface treatment liquid used in the present invention is, for example, polyethylene glycol, polypropylene glycol, polyethylene glycol alkyl ether, polypropylene glycol alkyl ether, polyethylene glycol fatty acid ester, polyethylene glycol alkylamine, polyethylene in addition to the anionic surfactant represented by the above general formula Nonionic surfactants such as glycol alkylamides and their ethylene oxide-propylene oxide copolymers, anions such as polyoxyethylene alkyl ether acetates, polyoxyethylene alkyl ether phosphates, polyoxyethylene alkyl ether sulfates A surfactant can be contained.

  The plate surface treatment liquid used in the present invention may contain a nitrogen-containing heterocyclic compound having a mercapto group and a thione group in addition to the triazine compound containing two or more mercapto groups and a substituted derivative thereof. Specific examples thereof include 2-mercapto-4-phenylimidazole, 2-mercapto-benzimidazole, imidazole compounds such as 2-mercapto-1-butyl-benzimidazole, 2-mercapto-4-phenylthiazole, 2-mercapto- Benzothiazole, thiazole compounds such as 2-mercaptonaphthothiazole, 2-mercapto-4,5-diphenyloxazole, oxazole compounds such as 2-mercaptobenzoxazole, 3-mercapto-5-nonyl-1,2,4-triazole, Trimer compounds such as 3-mercapto-4-amino-5-heptadecyl-1,2,4-triazole, 2-mercapto-5-phenyl-1,3,4-thiadiazole, 2-mercapto-5-phenyl-1, Such as 3,4-thiadiazole Asiazole compounds, 2-mercapto-5-n-heptyl-oxadiazole, 2-mercapto-5-n-heptyl-oxadiazole, 2-mercapto-5-phenyl-1,3,4-oxadiazole, Examples include oxadiazole compounds such as 2-heptadecyl-5-phenyl-1,3,4-oxadiazole, and tetrazole compounds such as 5-mercapto-1-phenyl-tetrazole.

  When the plate surface treatment solution used in the present invention is applied to a washing solution, a buffering agent that buffers the pH of the washing solution in a range of 4 to 10, preferably 4.5 to 8, such as a phosphate buffer or a citrate buffer. Agents or mixtures thereof. Moreover, you may contain antiseptic | preservative, an alkanolamine, etc. In the washing solution, proteolytic enzymes (for example, pepsin, rennin, trypsin, chymotrypsin, cathepsin, papain, ficin, thrombin, renin, collagenase, bromelain, bacterial proteinase), Japanese Patent Publication No. 48-29723, and The oleophilic agent described in 58-127828 can be contained.

  The water washing solution is used in a water washing treatment step for completely removing the silver halide emulsion layer on the aluminum support. The removal of the silver halide emulsion layer by washing with water is an extremely important step for completely exposing the silver image portion and the non-image portion constituted by the aluminum surface itself. In particular, it is necessary to completely eliminate gelatin and the like that inhibit the oleophilicity of the silver image portion that receives ink. Specifically, for example, a method of spraying a washing solution at 25 to 45 ° C. by a jet method or a method of peeling an emulsion layer with a scrub roller while spraying the washing solution is generally used, but JP-A-3-116151 is used. The emulsion layer can also be removed by using a release sheet described in JP-A-4-318553.

  When the plate surface treatment liquid used in the present invention is applied to the finishing liquid, the finishing liquid contains arabic gum, dextrin, sodium alginate, propylene glycol ester of alginic acid, in order to protect the anodized layer in the non-image area and improve hydrophilicity. It is preferable to contain protective colloids such as hydroxyethyl starch, carboxymethylcellulose, hydroxyethylcellulose, polyvinylpyrrolidone, polystyrene sulfonic acid, polyvinyl alcohol, and polyacrylic acid.

  Furthermore, it is preferable that the finishing liquid contains phosphate, nitrate, citrate, acetate, etc. as inorganic and organic acidic substances that improve hydrophilicity, and alkanolamine is used for the purpose of improving the rust prevention of the aluminum surface. For example, monoethanolamine, diethanolamine, triethanolamine, N-methylethanolamine, N, N-dimethylethanolamine, N-methyldiethanolamine, 2- (2-aminoethylamino) ethanol and the like can also be contained. Moreover, as a chelating agent generally used, for example, iminodiacetic acid, ethylenediaminetetraacetic acid, aminotrimethylenephosphonic acid and the like can be mixed.

  Further, it is also preferable to promote the exposure of the silver image to the surface by incorporating a proteolytic enzyme as in the case of the washing solution, and to more effectively bring out the action of the present invention.

  Further, when the plate surface treatment liquid used in the present invention is applied as a starter liquid, it is used in a form in which it is applied to the plate surface before starting printing. As long as the printing plate finishes a series of plate-making processes such as development, washing, and finishing, and the plate surface is dried, it can be used until it is installed in the printing press and printing is started. It is possible to process even during the period. Even after printing is started, the printing ink can be removed once and the silver image portion is exposed.

  The starter solution can be applied to the printing plate by using a commercially available automatic coating apparatus as well as by manually applying a waste cloth or sponge.

  The processing method for a lithographic printing plate according to the present invention can exhibit an effect when applied to at least one plate surface processing liquid selected from the above-mentioned washing liquid, finishing liquid or starter liquid, but is preferably used for the finishing liquid or starter liquid. It is more preferable to use it in a starter solution.

  The lithographic printing plate targeted by the present invention is a lithographic printing plate utilizing a silver complex diffusion transfer method having a physical development nucleus between an aluminum support and a silver halide emulsion layer. The silver halide emulsion contained in the silver halide emulsion layer is selected from commonly used silver chloride, silver bromide, silver iodide, silver chlorobromide, silver chloroiodobromide, silver iodobromide, etc. Silver chloride-based (meaning silver chloride of 50 mol% or more) is preferred. The emulsion type may be either a negative type or a positive type. These silver halide emulsions can be chemically or spectrally sensitized as necessary.

  As the hydrophilic colloid of the silver halide emulsion layer, gelatin is preferably used when preparing silver halide grains. Various gelatins such as acid-treated gelatin and alkali-treated gelatin can be used as the gelatin. In addition, modified gelatins such as phthalated gelatin and amidated gelatin can also be used. Furthermore, hydrophilic polymer compounds such as polyvinyl pyrrolidone, various starches, albumin, polyvinyl alcohol, gum arabic, and hydroxyethyl cellulose can be further contained. As the hydrophilic colloid to be used, it is desirable to use a hydrophilic colloid layer substantially free of a hardener in order to facilitate release after development.

  In addition, the silver halide emulsion layer is optionally coated with anionic, cationic, betaine, nonionic surfactants, thickeners such as carboxymethylcellulose, coating aids such as antifoaming agents, and chelating agents such as ethylenediaminetetraacetate. You may contain developing agents, such as an agent, hydroquinone, polyhydroxybenzenes, and 3-pyrazolidinones.

  The aluminum support used in the present invention is an aluminum plate whose surface is roughened and anodized, and is described in JP-A-63-260491 and US Pat. No. 5,427,889. It can be obtained by a method or a generally known method for producing an aluminum support for a PS plate.

  The physical development nuclei used in the present invention may be those used in a known silver complex diffusion transfer method, such as colloids such as gold and silver, metal sulfides in which water-soluble salts such as palladium and zinc and sulfides are mixed, and the like. Can be used. Various hydrophilic colloids can also be used as the protective colloid. For details and manufacturing methods thereof, see, for example, Japanese Patent Publication No. 48-30562, Japanese Patent Publication No. 48-55402, Japanese Patent Publication No. 53-21602, Focal Press, London, New York (1972), Andrelot. And “Photographic Silver Halide Diffusion Processes” by Edith Weide.

  The lithographic printing plate used in the present invention comprises a water-swellable intermediate layer described in JP-A-3-116151 and a hydrophobic polymer described in JP-A-4-282295 between a physical development nucleus and a silver halide emulsion layer. An intermediate layer containing beads may be provided.

  The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. In addition,% in description represents the mass% unless there is particular notice.

  Examples in the case where the present invention is applied to a washing solution will be described below.

An aluminum plate (A1050 type) having a thickness of 0.30 mm was immersed in a 10% phosphoric acid aqueous solution and then degreased in 2 g of a sodium hydroxide aqueous solution per liter. Next, electrolytic surface roughening was carried out at 35 ° C. for 40 seconds in an aqueous solution containing 4 g of hydrochloric acid per liter and 4 g of boric acid per liter. For the electrolytic surface roughening, a single-layer alternating current of 25 V, 35 A / dm ² , 50 Hz was used. Next, the aluminum plate was desmutted with a 30% aqueous sulfuric acid solution at 60 ° C. for 120 seconds, and further anodized in a 20% aqueous sulfuric acid solution. The amount of anodized aluminum in the obtained support was 2.4 g per m ² . The support was then washed with deionized water, treated with an aqueous solution of sodium bicarbonate, washed with water and dried.

A palladium sulfide core solution was applied to the anodized aluminum support thus obtained and dried. The amount of physical development nuclei was 0.7 mg / m ² .

Subsequently, a dispersion liquid in which 0.5 g of polymethyl methacrylate beads were contained per 1 m ² as an intermediate layer was applied.

  The silver halide emulsion was prepared by using alkali-treated gelatin having an average molecular weight of 100,000 and doping 0.006 mmol of potassium hexachloroiridium (IV) with an average particle size of 0.25 μm per silver mole by a control double jet method. A silver chloroiodide emulsion containing 0.4 mol% of silver iodide was prepared. The emulsion was then flocculated and washed. This emulsion was further subjected to sulfur gold sensitization, and then a stabilizer was added. The emulsion was spectrally sensitized in the blue region with 3 mg of blue sensitizing dye per gram of silver.

A surfactant was added to the silver halide emulsion thus prepared to prepare a coating solution. This emulsion layer coating solution is coated and dried on an aluminum support on which the above-mentioned physical development nuclei and intermediate layer have been coated so that the amount of silver is 2.0 g / m ² and the amount of gelatin is 2.0 g / m ^2. A printed version was obtained.

The lithographic printing plate was subjected to image output with a scanning exposure apparatus equipped with a blue semiconductor laser, and then processed with a plate making processor (Mitsubishi Paper P-α880RFW automatic coating and developing machine) to prepare a lithographic printing plate. The processor for plate making is a development process using a slot die coating device (80 ml of developer applied per 1 m ^{2 of} lithographic printing plate, the plate surface temperature of the lithographic printing plate coated with development is 25 ° C., and the developer is applied) Development time until the development stops in the next step is 12 seconds), water washing treatment step (washing off the emulsion layer with a scrub roller while spraying a washing solution of 33 ° C. for 10 seconds), finishing treatment step (20 ° C. , Roller coating) and a drying process.

The composition of the treatment liquid used is shown below.
<Developer>
Sodium hydroxide 33g
Anhydrous sodium sulfite 120g
Aluminum sulfate 15g
Sodium thiosulfate (pentahydrate) 18g
2-mercapto-5-n-heptyl-oxadiazole 0.75 g
Potassium bromide 1.5g
Glycerin 20g
Hydroquinone 25g
1-phenyl-3pyrazolidinone 5g
Bring to 1000 ml with deionized water.
pH (25 ° C.) = 13.0

<Washing liquid A>
2-mercapto-5-n-heptyl-oxadiazole 0.5 g
20g triethanolamine
Potassium bisulfite 6g
Amino trimethylene phosphonic acid 20g
Proteolytic enzyme 1g
Add water to adjust the total volume to 1000 ml. The pH was adjusted to 7.2.
Bioprolase AL-15 (bacterial proteinase, manufactured by Nagase Sangyo Co., Ltd.) was used as a proteolytic enzyme.

<Finishing liquid A>
Phosphoric acid 100g
N-methylethanolamine 30g
2-mercapto-5-n-heptyl-oxadiazole 0.5 g
90g of polypropylene glycol alkyl ether
Sodium nitrate 20g
Arabic gum 50g
Ethylenediaminetetraacetic acid 0.5g
Proteolytic enzyme 1g
Bring to 1000 ml with deionized water.
The pH was adjusted to 5.4.

  A washing solution B was prepared by adding 50 g of polyoxyethylene-polyoxypropylene laurylamine to the washing solution A per liter. Thereafter, the lithographic printing plate after the image output is processed in the same manner except that the rinsing liquid B is used in place of the rinsing liquid A by a plate making processor (Mitsubishi Paper P-α880RFW automatic coating and developing machine). A plate was made.

  A washing solution C was prepared by adding 50 g of polyoxyethylene distyrylphenyl ether sulfate to the washing solution A per liter. Thereafter, the lithographic printing plate after the image output is processed in the same manner except that the rinsing liquid C is used in place of the rinsing liquid A by a plate making processor (Mitsubishi Paper P-α880RFW automatic coating and developing machine). A plate was made.

  A water washing solution D was prepared by adding 50 g of polyoxyethylene n-butylphenyl ether sulfate to the water washing solution A per liter. Thereafter, the lithographic printing plate after the image output is processed in the same manner except that the rinsing liquid D is used in place of the rinsing liquid A by a plate making processor (Mitsubishi Paper P-α880RFW automatic coating and developing machine). A plate was made.

  A washing solution E was prepared by adding 50 g of polyoxyethylene nonylphenyl ether sulfate to the washing solution A per liter. Thereafter, the lithographic printing plate after the image output is processed in the same manner except that the rinsing liquid E is used in place of the rinsing liquid A by a plate making processor (Mitsubishi Paper P-α880RFW automatic coating and developing machine). A plate was made.

  A washing solution F was prepared by adding 50 g per liter of polyoxyethylene-polyoxypropylene laurylamine and 2.0 g of 2,4-dimercapto-6-dibutylaminotriazine to the washing solution A. Thereafter, the lithographic printing plate after the image output is processed in the same manner except that the rinsing liquid F is used in place of the rinsing liquid A by a plate making processor (Mitsubishi Paper P-α880RFW automatic coating and developing machine). A plate was made.

  A washing solution G was prepared by adding 50 g of polyoxyethylene distyrylphenyl ether sulfate to the washing solution A and 2.0 g of 2,4-dimercapto-6-dibutylaminotriazine per liter. Thereafter, the lithographic printing plate after the image output is processed in the same manner except that the rinsing liquid G is used in place of the rinsing liquid A by a plate making processor (Mitsubishi Paper P-α880RFW automatic coating and developing machine). A plate was made.

  A washing solution H was prepared by adding 50 g of polyoxyethylene n-butylphenyl ether sulfate to the washing solution A and 2.0 g of 2,4-dimercapto-6-dibutylaminotriazine per liter. Thereafter, the lithographic printing plate after the image output is processed in the same manner except that the rinsing liquid H is used in place of the rinsing liquid A by a plate making processor (Mitsubishi Paper P-α880RFW automatic coating and developing machine). A plate was made.

  A washing solution I was prepared by adding 50 g per liter of polyoxyethylene nonylphenyl ether sulfate and 2.0 g of 2,4-dimercapto-6-dibutylaminotriazine to the washing solution A. Thereafter, the lithographic printing plate after the image output is processed in the same manner except that the rinsing liquid I is used in place of the rinsing liquid A by a plate making processor (Mitsubishi Paper P-α880RFW automatic coating and developing machine). A plate was made.

  Each lithographic printing plate obtained by the above method was printed with a Komori Sprint 26 printing machine (trademark of an offset printing machine manufactured by Komori Corporation). The ink used for printing is a commercial UV ink (Dicure Scepter DT) from Dainippon Ink & Chemicals, Inc., and the dampening solution is a dampening solution for commercial PS plates (Astro Mark III) from Nikken Chemical Laboratory. It was used. In the evaluation, the number of printed sheets from the start of printing until a good printed matter was obtained was evaluated. The results are shown in Table 1.

  As is apparent from the results in Table 1, when the printing operation is performed using UV ink as a plate surface treatment liquid of the present invention, printing loss from the start of printing until a good printed matter is obtained. Paper can be greatly reduced.

  The Example at the time of applying this invention to a finishing liquid is shown.

  In addition to the finishing liquid A used in Example 1 as a finishing liquid, the following washing water was prepared.

  50 g of polyoxyethylene-polyoxypropylene laurylamine per liter was added to the finishing liquid A of Example 1 to obtain a finishing liquid B.

  50 g of polyoxyethylene distyryl phenyl ether sulfate per liter was added to the finishing liquid A of Example 1 to obtain a finishing liquid C.

  50 g of polyoxyethylene n-butylphenyl ether sulfate per liter was added to the finishing liquid A of Example 1 to obtain a finishing liquid D.

  50 g of polyoxyethylene nonylphenyl ether sulfate per liter was added to the finishing liquid A of Example 1 to obtain a finishing liquid E.

  50 g per liter of polyoxyethylene-polyoxypropylene laurylamine and 2.0 g per liter of 2,4-dimercapto-6-dibutylaminotriazine were added to the finishing liquid A of Example 1 to obtain a finishing liquid F. .

  50 g per liter of polyoxyethylene distyrylphenyl ether sulfate and 2.0 g of 2,4-dimercapto-6-dibutylaminotriazine were added to the finishing liquid A of Example 1 to obtain a finishing liquid G. .

  50 g per liter of polyoxyethylene n-butylphenyl ether sulfate and 2.0 g of 2,4-dimercapto-6-dibutylaminotriazine are added to the finishing liquid A of Example 1 to obtain a finishing liquid H. It was.

  50 g of polyoxyethylene nonylphenyl ether sulfate and 2.0 g of 2,4-dimercapto-6-dibutylaminotriazine per liter were added to the finishing liquid A of Example 1 to obtain a finishing liquid I.

  The lithographic printing plate obtained in Example 1 is output as an image by a scanning exposure apparatus equipped with a blue semiconductor laser in the same manner as in Example 1, and the developer, the rinsing liquid A, and the finishing liquids A to A used in Example 1 are used. Each I was processed in the same manner as in Example 1 by a plate making processor (Mitsubishi Paper P-α880RFW automatic coating and developing machine). The lithographic printing plate thus obtained was evaluated in the same manner as in Example 1 for the number of printed sheets from when printing was started until a good printed matter was obtained. The results are shown in Table 2.

  As is apparent from the results in Table 2, when the printing operation is performed using UV ink by applying the plate surface treatment liquid of the present invention to the finishing liquid, the printing loss from the start of printing until a good printed matter is obtained is obtained. Paper can be greatly reduced. In addition, better results were obtained when applied to the finishing solution than when applied to the washing solution.

  The Example at the time of applying this invention to a starter liquid is shown.

  The starter liquid shown below was prepared.

<Starter fluid A>
Sodium hydroxide 2g
Polyacrylic acid soda 100g
Amino trimethylene phosphonic acid 13g
Proteolytic enzyme 1.5g
Add water to adjust the total volume to 1000 ml. The pH was adjusted to 6.5.
Bioprolase AL-15 (bacterial proteinase, manufactured by Nagase Sangyo Co., Ltd.) was used as a proteolytic enzyme.

  50 g of polyoxyethylene-polyoxypropylene laurylamine per liter was added to the starter liquid A to obtain a starter liquid B.

  50 g of polyoxyethylene distyryl phenyl ether sulfate per liter was added to the starter liquid A to obtain a starter liquid C.

  50 g of polyoxyethylene n-butylphenyl ether sulfate was added to the starter liquid A per liter to obtain a starter liquid D.

  50 g of polyoxyethylene nonylphenyl ether sulfate per liter was added to the starter liquid A to obtain a starter liquid E.

  50 g of polyoxyethylene-polyoxypropylene laurylamine per liter and 2.0 g of 2,4-dimercapto-6-dibutylaminotriazine were added to the starter liquid A to obtain a starter liquid F.

  50 g of polyoxyethylene distyrylphenyl ether sulfate and 2.0 g of 2,4-dimercapto-6-dibutylaminotriazine per liter were added to the above starter solution A to obtain a starter solution G.

  50 g of polyoxyethylene n-butylphenyl ether sulfate per liter and 2.0 g of 2,4-dimercapto-6-dibutylaminotriazine per liter were added to the starter liquid A to obtain a starter liquid H.

  50 g of polyoxyethylene nonylphenyl ether sulfate and 2.0 g of 2,4-dimercapto-6-dibutylaminotriazine per liter were added to the starter liquid A to obtain a starter liquid I.

  The lithographic printing plate obtained in Example 1 is output as an image by a scanning exposure apparatus equipped with a blue semiconductor laser in the same manner as in Example 1, and the developer, rinsing liquid A, and finishing liquid A used in Example 1 are used. In the same manner as in Example 1, it was processed by a plate-making processor (Mitsubishi Paper P-α880RFW automatic coating and developing machine). The lithographic printing plate thus obtained was mounted on a Komori Sprint 26 printing machine (trademark of offset printing machine manufactured by Komori Corporation) in the same manner as in Example 1, and after installation, the starter liquids A to I were sponged. And applied to the plate surface by hand. Thereafter, as in Example 1, commercially available UV ink (Dicure Scepter DT) from Dainippon Ink & Chemicals, Inc., and a commercial PS plate moisturizer (ASTROMARK III) from Nikken Chemical Laboratory, Inc. were used. The number of printed sheets from when printing was started until a good printed material was obtained was evaluated. The results are shown in Table 3.

  As is apparent from the results in Table 3, by applying the UV ink to the starter liquid as a plate surface treatment liquid of the present invention, printing loss from the start of printing until a good printed matter is obtained is obtained. Paper can be greatly reduced. In addition, better results were obtained when applied to the finishing solution than the washing solution, and further to the starter solution than the finishing solution.

Claims (3)

After exposing and developing a lithographic printing plate using a silver complex diffusion transfer method having a physical development nucleus between an anodized aluminum support and a silver halide emulsion layer, an anionic property represented by the following general formula A processing method for a lithographic printing plate, wherein the processing is performed with a plate surface processing solution containing at least one compound of a surfactant and a triazine having two or more mercapto groups or a substituted derivative thereof.

(In the formula, R represents an alkyl group having 1 to 20 carbon atoms, X represents a hydrogen atom, an alkali metal or NH ₄ , m represents an integer of 1 to 5, and n represents an integer.)   The method for processing a lithographic printing plate according to claim 1, wherein the plate surface treatment liquid is a finishing liquid or a starter liquid.   The lithographic printing plate processing method according to claim 1, wherein the plate surface processing solution is a starter solution.