JP2736941B2 - Concentrated fountain solution composition for lithographic printing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a concentrated dampening solution composition useful for offset printing using a lithographic printing plate.

[0002]

2. Description of the Related Art Lithographic printing is a printing method that skillfully utilizes the property that water and oil are not essentially mixed. The printing plate surface has a region that receives water and repels oil-based ink, and a water-repellent oil-based ink. The former is a non-image area, and the latter is an image area. The desensitizing agent enlarges the surface chemical difference between the image area and the non-image area by wetting the non-image area with a fountain solution containing the same, thereby increasing the ink repellency of the non-image area and the image area. It has the effect of increasing ink receptivity.

The desensitizing agents generally known in the prior art include alkali metal salts or ammonium salts of dichromic acid, phosphoric acid or salts thereof such as ammonium salts, gum arabic and carboxymethyl cellulose (CMC). There is an aqueous solution to which a colloid substance or the like is added. However, the fountain solution containing these desensitizing agents has a disadvantage that it is difficult to uniformly wet the non-image area of the plate, and therefore, the printed matter sometimes becomes dirty, and it is very difficult to adjust the supply amount of the fountain solution. Requires skill.

In order to improve this drawback, a Dahlgren system using an aqueous solution containing about 20 to 25% of isopropyl alcohol as dampening water has been proposed. According to this method, the wetting of the non-image area is improved, the amount of dampening water is small, the balance between the supply amounts of the printing ink and water is easily adjusted, and the dampening water in the printing ink is easily adjusted. There are many advantages in terms of workability and accuracy of the printed matter obtained, such as a reduced emulsification amount and improved transferability of printing to a blanket.

[0005] However, since this isopropyl alcohol is easily evaporated, a special device for maintaining the isopropyl alcohol concentration of the dampening solution at a constant level is required, which is expensive in terms of price. Further, isopropyl alcohol has a peculiar unpleasant odor and also has a problem in toxicity, which is not preferable in a working environment. In addition, even if this dampening solution to which isopropyl alcohol is added is applied to offset printing using a normal water rod, the effect cannot be exerted because isopropyl alcohol evaporates on the roller and the plate surface, so that the effect cannot be exhibited. Had become.

[0006] Further, in recent years, social interest in industrial pollution has become extremely high, and regulations on the discharge of chromium ions in wastewater have become strict. In addition, the use of organic solvents such as isopropyl alcohol tends to be regulated in terms of safety and health. . For this reason, a desensitizing agent not containing these has been desired. In order to achieve these objects, for example, Japanese Patent Publication No. 55-25
No. 075, JP-B-55-19977 and JP-B-58-5797 describe compositions containing various surfactants. When these are used as fountain solutions, In order to make the surface tension 35 to 50 dynes / cm, it is necessary to keep the concentration of the surfactant in the desensitizing agent considerably high. In actual lithographic printing, the ink / water moves violently under the ink roll, printing plate and dampening water supply roll rotating at high speed.
Problems such as adhesion of water on the ink film and diffusion of the ink to the surface of the water have been problems. However, the combination of the surfactants proposed above can solve these problems completely. Was not enough. Further, there is a disadvantage that the fountain solution containing these surfactants easily foams during pumping or stirring.

By the way, US Pat. No. 3,877,372 discloses that
Solutions containing a mixture with at least one of ethylene glycol monobutyl ether, hexylene glycol and ethylene glycol are described. U.S. Patent No.
No. 4,278,467 includes n-hexoxydiethylene glycol, n-hexoxyethylene glycol, 2-ethyl-
A fountain solution containing at least one of 1,3-hexanediol, n-butoxyethylene glycol acetate, n-butoxydiethylene glycol acetate, and 3-butoxy-2-propanol is described. JP 5
JP-A-7-199693 discloses 2-ethyl-1,3-hexanediol and completely water-soluble propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, hexylene glycol, triethylene glycol, tetraethylene glycol, and tripropane. A fountain solution containing at least one of glycol, 1,5-pentanediol is described. Since these dampening solution compositions do not contain isopropyl alcohol, they are advantageous in terms of safety and hygiene. However, in the PS plate of an anodized aluminum substrate, it is hard to say that the non-image area is completely wet during printing, and particularly high speed. There has been a problem in that the non-image portion is stained during printing, and the shape of the halftone dot image portion is not normal, becomes large, and becomes uneven, that is, there is a problem that so-called tangling of the halftone dot image portion occurs. Furthermore, 2-ethyl-1,3-hexanediol has a problem in that it has insufficient solubility in water, and is disadvantageous for obtaining a highly concentrated fountain solution concentrate or a fountain solution additive. .

These isopropyl alcohol substitute compounds are generally high-boiling organic solvents, and have a serious drawback in that when water evaporates, the high-boiling organic solvent remains as a residue, affecting the image area of the PS plate.

[0009]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to eliminate the toxicity and drawbacks of the above-mentioned conventional dampening solution, and to adjust the supply amount without requiring specialized skills in printing. It can be easily performed, and not only prevents the printing plate (especially a printing plate (PS plate)) using a support obtained by electrochemically roughening anodized aluminum from being stained or blinded, but also prevents the printing plate from being stained. It is an object of the present invention to provide a concentrated fountain solution composition for lithographic printing which can easily obtain a high-quality printed matter excellent in fountain solution characteristics without damaging an image area.

[0010]

Means for Solving the Problems The present inventors have conducted intensive studies to achieve the above object, and as a result, by using a concentrated fountain solution composition for lithographic printing containing the following components,
The inventors have found that the above object can be easily solved and arrived at the present invention. a) a hydrophilic polymer compound having a film-forming property 0.1 to 10% by weight b) a pH buffer 0.01 to 15% by weight c) a surface tension of a 1% by weight aqueous solution (25 ° C.) having a boiling point of 140 ° C. or more 60 to dynes / cm or less, 5 to 80% by weight of an organic solvent mixed with water d) From the group of compounds represented by the following general formulas [I], [II], [III], [IV] or [V] At least one selected compound 0.05-10% by weight e) water 30-80% by weight

[0011]

Embedded image

In the formula, R ¹ , R ² and R ³ may be the same or different and represent a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, a hydroxyalkyl group, a hydroxyl group or a halogen atom; ⁴ , R ⁵ and R ⁶ may be the same or different, and include a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, a mercapto group, a sulfone group, a hydroxyl group,
A carboxyl group or a halogen atom, and R ⁷ , R ⁸ ,
R ⁹ and R ¹⁰ represent an alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group or a phenyl group, and R ¹¹ and R ¹²
Represents a hydrogen atom, an alkyl group having 1 to 3 carbon atoms or a hydroxyalkyl group, and M ¹ , M ² , M ³ and M ⁴ are
A hydrogen atom, an alkali metal such as sodium, potassium, or lithium; or an ammonium ion; Z represents a nitrogen atom or a phosphorus atom; and X represents an anion such as a halogen ion, a nitrate ion, a sulfate ion, or a hydroxide ion. Show.

The a) hydrophilic polymer compound having film-forming properties used in the present invention is a compound capable of imparting hydrophilicity to a non-image area of a lithographic printing plate. Specific examples of preferred compounds include , Gum arabic, starch derivatives (eg, dextrin, enzymatically decomposed dextrin, hydroxypropylated enzymatically decomposed dextrin, carboxymethylated starch, phosphate starch, octenyl succinate esterified starch), alginates, cellulose derivatives (eg, carboxymethyl cellulose) Carboxyethylcellulose, hydroxyethylcellulose, methylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, modified glyoxal thereof, etc.) and modified products thereof, and polyvinyl alcohol and derivatives thereof, polyvinylpyro. Pyrrolidone, polyacrylamide and copolymers thereof, polyacrylic acid and copolymers thereof, vinyl methyl ether / maleic anhydride copolymer, synthetic materials such as vinyl acetate / maleic anhydride copolymers. These polymer compounds can be used alone or as a mixture, and the concentration range is 0.1 to 10 in the concentrated fountain solution composition.
A range of weight% is preferred.

B) As a pH buffer, a water-soluble organic acid,
A compound containing an inorganic acid or a salt thereof may be used, which is effective for adjusting the pH of the dampening solution, for buffering the pH, for appropriately etching the lithographic printing plate support, or for preventing corrosion. Preferred organic acids include, for example, citric acid, ascorbic acid,
Examples include malic acid, tartaric acid, lactic acid, acetic acid, gluconic acid, acetic acid, hydroxyacetic acid, oxalic acid, malonic acid, levulinic acid, phytic acid, and organic phosphonic acid. Examples of the inorganic acid include phosphoric acid, nitric acid, and sulfuric acid. Further, alkali metal salts, alkaline earth metal salts or ammonium salts of these organic acids and / or inorganic acids, and organic amine salts are also preferably used. These organic acids, inorganic acids and / or salts thereof may be used alone or in combination of two or more. The above combinations may be used.

The concentration of these compounds in the concentrated fountain solution composition of the present invention is preferably in the range of 0.01 to 15% by weight. The pH value of the dampening solution diluted with water is preferably in the acidic range of 3 to 7, but the pH value contains alkali metal hydroxide, phosphoric acid, alkali metal salt, alkali metal carbonate, silicate and the like.
It can also be used in the alkaline range of 7 to 11. c)
Surface tension of 1% by weight aqueous solution at a boiling point of 140 ° C or higher is 25 ° C
As an organic solvent which is mixed with water and has a odor of 60 dyne / cm or less, a compound having a particularly low odor, a high stability in an aqueous solution, a low toxicity and a property of being difficult to evaporate can be particularly preferably used. .

Specific compounds include diethylene glycol monomethyl ether, triethylene glycol monomethyl ether, diethylene glycol monoethyl ether, triethylene glycol monoethyl ether,
Ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, ethylene glycol monopropyl ether, diethylene glycol monopropyl ether, triethylene glycol monopropyl ether, ethylene glycol monoisopropyl ether, diethylene glycol monoisopropyl ether, triethylene glycol monoisopropyl ether , Diethylene glycol monohexyl ether, triethylene glycol monohexyl ether, ethylene glycol monoisobutyl ether, diethylene glycol monoisobutyl ether, triethylene glycol monoisobutyl ether, propylene glycol monopropyl ether, dipropylene glycol Nopropyl ether, tripropylene glycol monopropyl ether, propylene glycol monobutyl ether, dipropylene glycol monobutyl ether, tripropylene glycol monobutyl ether, propylene glycol monoisobutyl ether, dipropylene glycol monoisobutyl ether, tripropylene glycol monoisobutyl ether, ethylene glycol Mono-tert-butyl ether, diethylene glycol mono-tert-butyl ether, triethylene glycol mono-tert-butyl ether, propylene glycol mono-tert-butyl ether, dipropylene glycol mono-tert-butyl
Butyl ether, tripropylene glycol mono-tert-butyl ether, 3-methoxybutanol, tetrahydrofurfuryl alcohol, N-methylpyrrolidone, γ-butyrolactone, octylene glycol, oxyethylene and / or oxypropylene adduct of octylene glycol, 3- Methyl-3-methoxybutanol and the like. In particular, propylene glycol ethers, oxyethylene and / or oxypropylene adducts of octylene glycol, 3-methoxybutanol,
-Methyl-3-methoxybutanol, N-methylpyrrolidone and the like are preferred compounds from the viewpoint of human body safety and printability. These compounds may be used alone or in combination of two or more compounds.
% By weight.

D) The above general formulas [I], [II], [III]
], [IV] or [V] are specific examples of the compound that easily forms micelles in an aqueous solution and easily forms an adduct between a poorly soluble substance and a molecule. For example, benzenesulfonic acid, p-toluenesulfonic acid, xylenesulfonic acid, cumenesulfonic acid, benzoic acid, salicylic acid, isophthalylsulfonic acid, gallic acid, phenolsulfonic acid, thiosalicylic acid, sodium tetraphenylboron, phenylphenolsulfonic acid, And diphenyl ether sulfonic acid. These alkali metal salts (Na, K, Li salts, etc.) and ammonium salts can also be used effectively.

Further, hydroxides such as tetraphenylphosphonium bromide, tetra-n-butylphosphonium bromide and tetrabutylammonium acid sulfate, chlorides, nitrates, sulfates and phosphates can also be used effectively. These compounds have the effect of completely preventing the image portion of the printing plate from deteriorating due to the residue of the solvent generated by evaporation of water, which is a problem when using a high boiling point solvent, and enhancing the protection of the image portion. And the printing can be stably performed.

The preferred working concentration range is from 0.05 to 10% by weight.
It is. Two or more of these compounds can be used in combination. If necessary, other additives may be added to the concentrated fountain solution composition of the present invention. Such additives include water-soluble nitrates. These compounds exhibit an effect of preventing corrosion of a printing plate and of a metal used in a printing press. Specific examples include sodium nitrate, potassium nitrate, ammonium nitrate, magnesium nitrate, calcium nitrate, beryllium nitrate, aluminum nitrate, zinc nitrate, zirconium nitrate, nickel nitrate, manganese nitrate, chromium nitrate and the like. These salts may be used alone or in combination of two or more. This salt is used in the range of 0.1 to 20% by weight in the concentrated fountain solution composition.

Further, a surfactant may be added. For example, as anionic surfactants, fatty acid salts, abietic salts, hydroxyalkanesulfonates, alkanesulfonates, dialkyl sulfosuccinates,
Linear alkyl benzene sulfonates, branched chain alkyl benzene sulfonates, alkyl naphthalene sulfonates, alkyl phenoxy polyoxyethylene propyl sulfonates, polyoxyethylene alkyl sulfophenyl ether salts, N-methyl-N-oleyl taurine sodium salts, N-alkyl sulfosuccinic acid monoamide disodium salts, petroleum sulfone complex salts, sulfated castor oil, sulfated tallow oil, sulfates of fatty acid alkyl esters, alkyl sulfates, polyoxyethylene alkyl ether sulfates, fatty acid monoglyceride sulfate Ester salts, polyoxyethylene alkylphenyl ether sulfate salts, polyoxyethylene styryl phenyl ether sulfate salts,
Alkyl phosphates, polyoxyethylene alkyl ether phosphates, polyoxyethylene alkylphenyl ether phosphates, partially saponified styrene-maleic anhydride copolymers, olefins
Partially saponified products of a maleic anhydride copolymer, naphthalene sulfonate formalin condensates and the like can be mentioned. Of these, dialkyl sulfosuccinates, alkyl sulfates and alkyl naphthalene sulfonates are particularly preferably used.

Examples of the nonionic surfactant include polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, polyoxyethylene polystyryl phenyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, and glycerin fatty acid partial esters. , Sorbitan fatty acid partial esters, pentaerythritol fatty acid partial esters, propylene glycol monofatty acid esters, sucrose fatty acid partial esters, polyoxyethylene sorbitan fatty acid partial esters, polyoxyethylene sorbitol fatty acid partial esters, polyethylene glycol fatty acid esters Kind,
Polyglycerin fatty acid partial esters, polyoxyethylenated castor oils, polyoxyethylene glycerin fatty acid partial esters, fatty acid diethanolamides, N,
Examples include N-bis-2-hydroxyalkylamines, polyoxyethylene alkylamines, triethanolamine fatty acid esters, and trialkylamine oxides. Among them, polyoxyethylene alkyl phenyl ethers, polyoxyethylene-polyoxypropylene block polymers and the like are preferably used.

Examples of the cationic surfactant include alkylamine salts, quaternary ammonium salts, polyoxyethylene alkylamine salts, and polyethylenepolyamine derivatives. The content of these surfactants is 10% by weight or less, preferably 0.01 to
3.0% by weight is suitable.

The concentrated fountain solution composition of the present invention further comprises ethylene glycol, propylene glycol,
Triethylene glycol, butylene glycol, hexylene glycol, diethylene glycol, dipropylene glycol, glycerin, trimethylolpropane, diglycerin and the like are preferably used. These wetting agents may be used alone or in combination of two or more. Generally, the wetting agent is 1 to
It is preferred to use it in an amount of 25% by weight.

Further, a chelating compound may be added to the concentrated fountain solution composition of the present invention. Usually, the concentrated dampening solution composition is diluted with tap water, well water or the like before use. At this time, calcium ions and the like contained in the diluted tap water or well water may adversely affect the printing and cause the printed matter to be easily stained. In such a case, the above disadvantage can be solved by adding a chelate compound. Preferred chelating compounds include, for example, ethylenediaminetetraacetic acid, its potassium salt, its sodium salt; diethylenetriaminepentaacetic acid, its potassium salt, its sodium salt; triethylenetetraminehexaacetic acid, its potassium salt, its sodium salt, hydroxyethylethylenediaminetriacetic acid Acetic acid, its potassium salt, its sodium salt; nitrilotriacetic acid, its sodium salt; 1-hydroxyethane-1,1-diphosphonic acid, its potassium salt, its sodium salt; aminotri (methylenephosphonic acid), its potassium salt, its sodium Organic phosphonic acids such as salts and phosphonoalkanetricarboxylic acids can be mentioned. Organic amine salts are also effective in place of the sodium or potassium salts of the above chelating agents. These chelating agents are selected from those which are stably present in the fountain solution composition and do not inhibit printability. The amount added to the concentrated dampening water composition is 0.001 to 10% by weight, preferably 0.01 to 5% by weight.

Further, various coloring agents, antifoaming agents, preservatives and the like can be added to the concentrated fountain solution composition of the present invention.
For example, food coloring agents and the like can be preferably used as the coloring agent. For example, as the yellow pigment, CI No. 19140, 1
5985, CI Red No. 16185, 45
430, 16255, 45380, 45100, CI No. 42640 as purple pigment, CI as blue pigment
No. 42090, 73015, CIN as green pigment
o. 42095, and the like. As the antifoaming agent, a silicon antifoaming agent is preferable. Among them, an emulsified dispersion type and a solubilized type can be used. The preferred addition amount is 0.
A range of 001 to 1% by weight is preferred.

Further, as preservatives, phenol or derivatives thereof, formalin, imidazole derivatives, sodium dehydroacetate, 4-isothiazolin-3-one derivatives, benzotriazole derivatives, amidine or guanidine derivatives, quaternary ammonium salts, pyridine, Derivatives of quinoline or guanidine, derivatives of diazine or triazole, derivatives of oxazole or oxazine, and the like can be given. A preferable addition amount is an amount stably exerting an effect on bacteria, molds, yeasts, and the like, and varies depending on the kind of bacteria, molds, and yeasts. It is preferably in the range of 4 to 4% by weight, and it is preferable to use two or more preservatives which are effective against various molds, bacteria and yeasts.

The above-mentioned components are converted to water, preferably demineralized water, that is, an aqueous solution dissolved in pure water to obtain the concentrated fountain solution composition of the present invention. At the time of use, this is diluted 10 times to 100 times with tap water, well water or the like.

[0028]

EFFECT OF THE INVENTION The concentrated fountain solution composition of the present invention has excellent printability and can stably print without damaging the image area of the printing plate, despite the use of a high boiling point solvent. it can.

[0029]

Next, the present invention will be described more specifically with reference to examples. In addition,% indicates weight% unless otherwise specified. As shown in Table 1, concentrated fountain solution compositions 1 to 5 of the present invention and concentrated fountain solution compositions 6 to 8 as comparative examples were prepared. Tables 2 and 3 show the test results obtained by diluting the resultant solution 40 times with water and using the diluted solution as a dampening solution.

Table 1 {Example Comparative Example Component} ───────────── 1 2 3 4 5 6 7 8 ───────────────────────────── ────── a) Film formation Hydroxypropyl cellulose 6-5-3 6 3 3 Functional polymer Polyvinyl methyl ether-6-53-33 / maleic anhydride copolymer Arabic gum--11 ----─────────────────────────────────── b) pH buffered phosphoric acid (85%) 5 5 5 5 5 5 5 5 Substance Diammonium phosphate 4 4 4 4 4 4 4 4 Diammonium citrate 10 10 10 10 10 10 10 10 ──────────────── ─────────────────── c) High boiling octylene glycol d 20 20--50 20 50-Solvent Tylene oxide 3 mol adduct Diethylene glycol mono 250--140 40 250 40-Butyl ether Propylene glycol mono-250 200-180-180 250 Propyl ether N-methylpyrrolidone--70 130----──────── ─────────────────────────── d) Additives Sodium phenylsulfonate 20-10 10 10---Sodium isophthalylsulfonate- 20-20 10---Lium tetraphenylphosphonium 5-10-10---Bromide Tetra n-butylphosphonium-10------Mubromide ────────────────硝酸 Nitrate Magnesium nitrate (6H ₂ O) 10 10 10 10 10 10 10 10 10 Ammonium nitrate 5 5 5 5 5 5 5 5 ────── ───────────────────────────── Unit is grams . The above components were made up to 1000 ml with pure water. Test method FPS (positive PS plate manufactured by Fuji Photo Film Co., Ltd.) was exposed using a positive film having a solid portion and a 30% halftone dot portion, and a PS automatic developing machine 800EII and a positive developer DP-4 were used.
(Diluted 8 times with water), Finisher FP for positive (2 times diluted with water) (both manufactured by Fuji Photo Film Co., Ltd.) Attach it to a Lithrone printing machine (Komorimatic equipment) and print using a fountain solution obtained by diluting Toyo Ink MK-V black ink and the concentrated solutions of Examples 1 to 5 and Comparative Examples 6 to 8 40 times with tap water. went.

At that time, evaluation of printability and observation of deterioration of the solid area and 30% halftone dot image area of the PS plate after stopping by supplying a little dampening water and stopping for 60 minutes before stopping the printing press. did. a. Metering roll contamination: The degree of ink adhesion to the watering metering roll is examined.

Good. A: Somewhat inferior. B Inferior. C b. Bleeding property: When printing was performed for 5000 and 10000 sheets using an ink (Dai Nippon Ink Co., Ltd. Apex G Beni S), the operation of the printing press was stopped, and the degree of bleeding of the ink in the image area on the non-image area was measured. Find out.

There is almost no bleeding. A: There is slight bleeding. B: There is much bleeding. C c. Emulsifying property: When 10,000 sheets are printed, the emulsifying state of the ink on the ink kneading roll is examined.

Good. A: Somewhat bad. B Bad. C d. Continuous stability: Using fresh water as a dampening solution, 1000
Print 0 sheets, find the amount of dampening water that does not cause stains (minimum water level), print using various dampening water with this minimum water level, and print until stains occur on the printed matter Judge based on the number of sheets.

10000 sheets or more. A 10,000 to 3000 sheets. B Less than 3000 sheets. Ce. Deterioration of image part After the printing press is stopped, it is left for 60 minutes, and the deterioration of the solid part and the halftone dot part is visually determined.

No problem A With slight deterioration B Deterioration C The fountain solutions of Examples 1 to 5 are (a) metering dirt, (b)
Excellent bleeding property, (c) emulsifying property, (d) continuous stability, and (e) deterioration of the image area were obtained, and good printed matter was obtained. The results are shown in Table 2.

Table 2 ─────────────────────────────────── Working example Comparative example ───── {1 2 3 4 5 6 7 8}汚 れ Metering dirt A A A A A A A A B Ink bleed A A A A A A A A B Emulsifiability A A A A A A A A A A A Continuous stability A A A A A A A C A Degradation of image area A A A A A C C A ───────────────────────────────── ── Subsequently, the printing press was stopped, and 5 μl of each dampening solution was applied to the solid portion and the 30% halftone dot image portion of the PS plate using a syringe.
10 μl, 20 μl and 50 μl were dropped and left for 60 minutes. Thereafter, printing was resumed and the deterioration of the image area was evaluated.

The results are shown in Table 3. Table 3 ──────────────────────────────── Implementation example Comparative example ─────────── {1 2 3 4 5 6 7 8} 5 μl AA AA AAC CCB 10 μl AA AA A A C C B A 20 μl AA AA AA BCA 50 μl A A A A A A A A B C A A ───────────────────── A No problem B Slightly deteriorated (with ring-shaped marks) C Deterioration Examples 1 to 5 compared to dampening solution of comparative example With the fountain solution, almost no deterioration of the image area was observed, and the fountain solution was completely protected.

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-292092 (JP, A) JP-A-62-218190 (JP, A) JP-A-62-292492 (JP, A) 73394 (JP, A) JP-A-3-63187 (JP, A) JP-A-2-108595 (JP, A)

Claims (1)

(57) [Claims] 1. A concentrated dampening solution composition for lithographic printing, comprising the following components: a) A hydrophilic polymer compound having a film forming property 0.1 to 10% by weight b) A pH buffer 0.01 to 15% by weight c) A surface tension of a 1% by weight aqueous solution having a boiling point of 140 ° C. or more is 60 dynes / cm. The following organic solvent mixed with water: 5 to 80% by weight d) At least one selected from the group of compounds represented by the following general formulas [I], [II], [III], [IV] or [V] One compound 0.05 to 10% by weight e) Water 30 to 80% by weight Wherein, R ^1, R ² and R ³ may be the same or different represents a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, a hydroxyalkyl group, a hydroxyl group or a halogen atom, R ^4, R ⁵ and R ⁶ may be the same or different, and represent a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, a mercapto group, a sulfone group, a hydroxyl group, a carboxyl group or a halogen atom, and R ⁷ , R ⁸ , R ⁹ and R ¹⁰
Represents an alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group or a phenyl group, R ¹¹ and R ¹² represent a hydrogen atom,
Represents an alkyl group or a hydroxyalkyl group having 1 to 3 carbon atoms, M ¹ , M ² , M ³ and M ⁴ represent a hydrogen atom, an alkali metal or ammonium ion, Z represents a nitrogen atom or a phosphorus atom, X represents an anion.