JP3484645B2 - Plate surface treatment liquid for lithographic printing plates - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a plate surface treating solution for a lithographic printing plate used as a lithographic printing plate. Details
For neutralizing solution (stabilizing solution) and sensitizing solution (etching solution)
Things. 2. Description of the Related Art High sensitivity and spectral sensitization
Some printing plates using silver halide emulsions
Has been put to practical use. Of which silver image is received ink
US Patent for Offset Printing Plate
No. 3721559, No. 3490905, Shoko 4
No. 8-30562, U.S. Pat. No. 3,385,701, U.S. Pat.
No. 3814603, JP-B-44-27242, JP-A-Showa
No. 53-21602, U.S. Pat.
Nos. 3,763,323 and 3,099,209,
No. 3-9603. [0003] These are the most common methods for producing printing plates.
Although it is roughly classified into several types,
They are common in reasoning. Lithographic printing
The plate is made of a hydrophilic and water-based image area that accepts lipophilic ink.
And a non-image portion that receives Therefore, usually
Lithographic printing supplies both water and ink to the plate,
Selectively receive colored ink and non-image areas receive water.
And transfer the ink on the object to a substrate such as paper.
It is done by letting [0004] In order to obtain a good printed matter, an image portion and
The difference between the lipophilicity and hydrophilicity of the surface of the non-image area is large enough
Is required. [0005] The printing plate using the silver halide emulsion described above
The plate making method is simple, reliable and quick, and must be automated
High sensitivity, high resolution, and high image reproducibility
Organic colloids such as diazo photosensitive materials
Compared to the printing plate (PS plate) etc.
Sufficient difference in lipophilicity and hydrophilicity between image and non-image areas
It was not big. In order to overcome such disadvantages, Japanese Patent Publication No. Sho 48
No. 29723, Japanese Patent Application Laid-Open No. 58-127828,
-103185, 2-103187, 2-25
1490, same Hei 2-254454, same Hei 2-28414
No. 6 etc., water-insoluble with mercapto group or thione group
Act on silver images before printing with water-soluble compounds and ink acceptability
Has been shown to improve. That is, of the compound
Mercapto group or thione group adsorbs to image silver and the same compound
The hydrophobic part of the image covers the image silver and the image area and the non-image area
It is thought that the difference between lipophilicity and hydrophilicity is relatively large
Have been. Having these mercapto groups or thione groups
Depending on the type of the compound,
Performance and stability over time in the processing solution. Japanese Unexamined Patent Publication No. Hei 2
-103185, 2-2-1490, etc.
Compounds having two or more mercapto groups or thione groups
Is effective for improving the printing durability of image silver,
Has the disadvantage of extremely poor aging stability due to
You. The Japanese Patent Application Laid-Open No. H11-157556 discloses a technique for improving the temporal stability due to this oxidation.
It was an operation, but it was still insufficient. Further, two or more mercapto groups or thio groups
Compounds having a thiol group have a mercapto group or a thione group.
Ink acceptance at the start of printing compared to compounds with only one
Experience has shown that performance is inferior. Therefore, at the start of printing, the subject of the present invention,
Plate surface treatment liquid to improve ink receiving performance
Having two or more mercapto groups or thione groups
The compound has the disadvantages described above, and this compound is
The idea of using it had not existed since the beginning of development. Generally, DT which makes image silver ink-receptive
R lithographic printing materials are used for image exposure when preparing printing plates.
After, to develop at high pH (pH 13 or more), after development,
It is necessary to neutralize and stabilize the surface of the lithographic printing plate.
Neutral solutions that are weak to acidic are used. After the neutralization is stabilized, the silver image area is
Has a mercapto group or a thione group to make
Treated with a sensitizing solution (etch solution) containing
Was. Compounds having a mercapto group or a thione group
The substance is generally dissolved in an alkaline solution or an organic solvent
However, since it does not dissolve in neutral or weakly acidic aqueous solutions,
Was dissolved in an organic solvent and added. In recent years, image silver has been used as ink acceptability.
Engraving plates on printing presses as lithographic printing plates become larger
It is possible to etch with a sensitizing liquid (etch liquid) before printing.
It is difficult to do it industrially, and even neutralizing solution after development processing
It has a sensitizing function and saves the above sensitizing solution (etch solution).
Abbreviation or increase in sensitizing power by combined use with etchant
Attempts have been made. However, mercapto groups or thiones
Neutral solution or etch solution with neutral to weak acid
Ethyl alcohol conventionally used to dissolve
-Use of organic solvents such as
It is not preferable because of environmental and safety issues. Especially neutralization
In liquids, the organic solvent evaporates in the processing equipment and
Compounds having thio groups or thione groups are likely to precipitate
There is a problem. In order to solve the above problem, Japanese Patent Laid-Open Publication No.
No. 9982, No. 7-248630, using amine compounds
Has a mercapto group or a thione group in the plate surface treatment solution.
A method for dissolving and containing a compound is disclosed. However, mercapto groups are not
Or a plate surface treatment solution in which a compound having a thione group is dissolved,
Dissolution stability of compounds with mercapto or thione groups
A new problem has arisen due to the poor nature. Sandals
That is, during storage of the treatment liquid, especially when stored at a low temperature in winter.
Compound with mercapto group or thione group
Problem arises. This precipitate is
The trouble was that it did not easily redissolve. In particular,
A compound that effectively affects ink receptivity, ie, one compound
Compounds having a mercapto group or a thione group and a hydrophobic group
Has poor solubility, and this improvement has been desired. On the other hand, development and neutralization treatments used in plate making
The immersion treatment method that stores a large amount of treatment liquid in the tank
It has been commonly used since then.
(Reduction of liquid volume) and improvement of maintainability of processing equipment
Coating method that can be processed with a small amount of processing liquid.
Is being developed. This coating method is applied to a photosensitive surface of a photosensitive material.
It applies the required amount of processing liquid for processing.
48-76603, 4-307245, 6
-27682, and JP-A-7-175219.
Have been. Of these, wire bars were used
The roller coating method can measure a fixed amount of coating.
And preferred. However, prior to these coating methods,
Including the compound having a mercapto group or a thione group
When using a neutralizing solution that has
That compounds having a thiol or thione group are deposited
Occurred. The object of the present invention is to provide an image
Plate surface treatment of lithographic printing plates using silver as ink acceptability
Liquid (neutralizing liquid) or sensitizing liquid (etching liquid)
And one mercap without substantially using an organic solvent.
Stabilizes water-insoluble compounds with thiol or thione groups
Especially during low-temperature storage.
Prevents precipitation of compounds having capto or thione groups
And by maintaining the compound in a stable dissolved state,
Is to maintain stable ink acceptability. The present invention
Another object of the present invention is to apply a coating method having a coating mechanism.
The purpose is to provide a neutralization stabilizer. [0021] The above objects of the present invention are as follows.
An amine compound; Has one mercapto group or thione group
At least one water-insoluble compound, and (1)
Including at least one compound selected from the group consisting of
Image silver, which is characterized by having
This was achieved by using a lithographic printing plate surface treatment solution. (1) Carboxy group-containing number average molecular weight of about 20,000 or less
Water-soluble polymer (2) Formalin condensate of aromatic sulfonic acid (3) Anionic surface activity having polyoxyethylene group
Agent (4) Organic disulfide compound The compound of the above (1) to (4)
Inclusion of one kind impairs the ink receptivity of the image area
One mercapto group or thione in the processing solution
It is necessary to maintain the stable dissolution of water-insoluble compounds
To increase the stability of the plate surface treatment solution,
It was possible to obtain the specified ink acceptability. In the present invention, the ink receiving performance is improved.
The compound used for the synthesis is one mercapto group.
Or a water-insoluble compound having a thione group. 2 or more
The above compound having a mercapto group or a thione group
Being out of the subject of Ming. In the present invention, preferably, carbon
An alkyl group, alkenyl group or aryl having 3 or more
Is a compound having a lipophilic group such as
JP-A-48-29723, JP-A-58-127828, etc.
It is described in. One mercapto group or thione of the present invention
As a typical example of a water-insoluble compound having a group,
Those having the general formula shown in (1) are preferably used. Embedded image (R in the formula ₁ , R _Three Preferably has 3 or more carbon atoms
Or 3 to 12 alkyl groups, alkenyl groups, aralkyl
Group or aryl group, R _Two Is hydrogen, an alkyl group,
Represents a kenyl group, an aralkyl group or an aryl group. m,
n represents an integer of 1 or more; _Two Is an alkyl having 3 or more carbon atoms
Kill group, alkenyl group, aralkyl group or aryl group
In the case, n may be 0. Z is N, C in the formula
And the remainder of the bond necessary to form a 5- or 6-membered ring with
Shows an atomic group of. Specific examples of the 5- or 6-membered ring include
Midazole, imidazoline, thiazole, thiazoline,
Oxazole, oxazoline, pyrazoline, triazoline
, Thiadiazole, oxadiazole, tetrazo
Pyridine, pyrimidine, pyridazine, pyrazine, g
Liadin, etc., and these rings are formed by condensation of two or more
May be condensed with a benzene ring or naphthalene ring.
They may be combined. Specific examples of such compounds include 2-merca
Pt-4-phenylimidazole, 2-mercapto-1
-Benzylimidazole, 2-mercapto-1-butyl
-Benzimidazole, 1,3-dibenzyl-imidazo
Lysine-2-thione, 2-mercapto-4-phenylthio
Azole, 3-butyl-benzothiazoline-2-thio
3-dodecyl-benzothiazoline-2-thione, 2
-Mercapto-4,5-diphenyloxazole, 3-
Pentyl-benzoxazoline-2-thione, 1-fe
Nyl-3-methylpyrazolin-5-thione, 3-merca
Pt-4-allyl-5-pentadecyl-1,2,4-to
Riazol, 3-mercapto-5-nonyl-1,2,4
-Triazole, 3-mercapto-4-acetamide-5
-Heptyl-1,2,4-triazole, 3-mercap
To-4-amino-5-heptadecyl-1,2,4-tri
Azole, 2-mercapto-5-phenyl-1,3,4
-Thiadiazole, 2-mercapto-5-phenyl-
1,3,4-thiadiazole, 2-mercapto-5-n
-Heptyl-oxathiazole, 2-mercapto-5
n-heptyl-oxadiazole, 2-mercapto-5
Phenyl-1,3,4-oxadiazole, 2-hepta
Decyl-5-phenyl-1,3,4-oxadiazo
5-mercapto-1-phenyl-tetrazole, 3
-Mercapto-4-methyl-6-phenyl-pyridazi
2-mercapto-5,6-diphenyl-pyrazine,
2-mercapto-4,6-diphenyl-1,3,5-to
Liazin, 2-amino-4-mercapto-6-benzyl
-1,3,5-triazine and the like.
It is not limited. The mercapto group or thiol group used in the present invention
The amount of the compound having an ON group is per 1 liter of the plate surface treatment solution.
0.01 to 10 g, preferably 0.02 to 5 g
Add in the range. The mercapto group or thiol group used in the present invention
Neutral to weakly acidic compounds mainly containing water
For example, a method of dissolving in a plate surface treatment solution (pH 5 to 7)
For example, a method of adjusting the pH by dissolving with an alkaline solution, amine
Compound method, quaternary ammonium salt type cation field
Although various methods such as a method using a surfactant can be considered,
A method using an amine compound, but is not limited to these
Not something. As described above, in the present invention, the organic
Solvents, especially organic solvents having a low boiling point (100 ° C. or lower), for example,
Ethyl alcohol, isopropyl alcohol, etc. are substantial
Not to be used for
20% or less, especially 1% with respect to the processing solution.
The present invention works effectively even when the amount is 0% or less. The above amine compound is, for example, monoethanol
Luamine, diethanolamine, triethanolamine
Amino alcohols such as aminoethylethanolamine
, Monoamines such as propylamine and butylamine
, Diamines such as dimethylaminoethylamine, N-
Polyamines such as aminopropylpropanediamine and
Cyclic amines such as pyridine and piperidine; Preferred
These are amino alcohols. These amine compounds
Is obtained from Nippon Emulsifier Co., Ltd., Koei Chemical Industry Co., Ltd.
Rukoto can. The amine compound used in the present invention is as described above.
For compounds having a mercapto group or a thione group
1: 1 to 100: 1 by weight ratio, preferably 1: 1 to 5
Add at a ratio in the range of 0: 1. After that,
Prepared by adding other compounds as necessary
I do. In the present invention, the above-dissolved
Dissolution stability of compounds with mercapto or thione groups
Select from the following (1) to (4) to improve
At least one compound. (1) Cal
Water-soluble heavy having a number average molecular weight of about 20,000 or less having a boxyl group
Merging, (2) formalin condensate of aromatic sulfonic acid,
(3) Anionic surfactant having a polyoxyethylene group
Or (4) an organic disulfide compound. The above compounds (1) to (4) are treated with
Oxidation of Compounds Having Two or More Mercapto Groups in Water
To prevent deterioration of lipophilicity due to oil
51490, 2-103185, 2-10318
7, 2-284146. Only
While these compounds are neutral to neutral
One mercapto group or thio
Extremely stable dissolution of water-insoluble compounds
To prevent precipitation under low temperature conditions is unexpected.
It was a discovery. The compound used in the above (1) is
Number having xyl group (including its salt or acid anhydride)
It is a water-soluble polymer having an average molecular weight of about 20,000 or less. Such a water-soluble polymer is composed of a single monomer.
Olefin Unsaturation Containing Carboxyl Group as Position
Compounds, such as acrylic acid, methacrylic acid, maleic acid,
Homopolymers such as sorbic acid and itaconic acid
Olefins containing carboxyl groups as mer units
A saturated compound and a vinyl monomer copolymerizable therewith;
Can be a copolymer of The above-mentioned copolymer having a carboxy group is obtained.
Styrene, or
Alkyl-substituted styrene such as methyl and ethyl, methoxy, etc.
Halogen-substituted styrene, chloro, etc.
Styrene derivatives such as ethylene, ethylene, butylene, etc.
Of ethylene unsaturated monoolefins, vinyl chloride, etc.
Vinyl esters such as vinyl halides and vinyl acetate
Or methacrylic acid such as methyl, isobutyl, etc.
Alkyl esters of luic acid, vinyl ether, vinyl
Phthalenes and the like;
Different olefinic unsaturated compounds containing copolymer components
May be used. Lipophilic, especially styrene
It is particularly preferable to use a copolymer component containing a hydrophilic vinyl monomer.
Good. The copolymer containing a carboxyl group in the copolymer
Lefin-based unsaturated material is at least about 10% by weight, preferably
Is 20% by weight or less. This carboxyl group is
It may be made of salt such as ium, potassium, etc.
It may be. The above water-soluble polymer having a carboxy group
Has a number average molecular weight of about 20,000 or less, and
Particularly, those having a range of about 1,000 to 15,000 are preferable. These water-soluble polymers can be used for solution polymerization and the like.
Can be easily manufactured by known manufacturing methods of
It can also be obtained as a commercial product. This water-soluble polymer
Content in the treatment solution is about 0.1% to 20% (weight
Concentration) is appropriate. Mercapto group or thio
About 1 to 100 times (weight
Ratio) is preferred. Specific examples are shown below. What
Incidentally, the polymerization ratio is shown by weight%. Embedded image Embedded image Embedded image Embedded image The formalin aromatic sulfonic acid of the above (2)
The condensate is β-naphthalene sulfone contained in the following chemical formula 6.
Sodium formalin condensate, methyl naphthalene sulfone
Sodium formalin condensate is a typical example
You. These compounds are commercially available from various manufacturers.
And can be easily obtained. Embedded image (N is an integer of 1 or more, preferably 2
~ 5. M is a click of hydrogen atom, alkali metal atom, etc.
These activators may be used in combination of two or more.
No. The content of this activator is from about 0.1% to 2%.
A concentration range of 0% (weight) is appropriate. Mercapto group
Or about 1 to 100 for compounds containing a thione group.
Double (weight ratio) combinations are preferred. Having the above polyoxyethylene group (3)
The anionic surfactant is represented by the following chemical formula 7. Embedded image R is a substituted or unsubstituted C 1 -C 30
Represents an alkyl group, an alkenyl group, or an aryl group. Q is
O, S, COO, -N (R ₁ )-, -N (R ₁ ) CO-,
−N (R ₁ ) SO _Two − (R ₁ Is a hydrogen atom, substituted or unsubstituted
Shows a substituted alkyl group. B) is an alkylene group, an arylene group, an oxypropylene group
And the like. m is 0 or an integer of 1 or more
You. n is the average degree of polymerization of ethylene oxide, 1-50,
Preferably it is 2-10. A is Embedded image M is hydrogen atom, alkali metal, alkaline earth
Metal, ammonium, lower alkylamine, etc.
Indicates thione. The description of B, Q, R, m, and n is the same as in Chemical Formula 7.
Righteous. These compounds are disclosed in US Pat.
Nos. 2 and 260831, JP-A-54-98235
And Japanese Patent Publication No. 40-23747. An ani having the polyoxyethylene of the present invention
Specific examples of the on-surfactant are shown below. However, CH _Two C
H _Two O is abbreviated as EO. Embedded image Embedded image Embedded image Embedded image Embedded image The aniline containing these polyoxyethylenes
On-surfactants are available from manufacturers as anionic surfactants.
And can be easily obtained. The content of this activator
Is suitably about 0.1% to 20% (% by weight).
About compounds containing a rucapto group or a thione group
A combination of 1 to 100 times (weight ratio) is preferable. The organic disulfide compound of the above (4)
Are shown below. Embedded image Embedded image Embedded image The content of this compound ranges from about 0.1% to 2%.
A range of 0% (weight) is appropriate, and a mercapto group or
About 1/10 to 10 for compounds containing a thione group
A double (weight ratio) combination ratio is preferred. In addition to the above compounds, one of the plate surface treatment solutions may be used.
Commonly used buffers, preservatives, preservatives, wetting agents and
Surfactants and the like can be mixed. For example, buffer
Include inorganic acids such as phosphoric acid and sulfuric acid, succinic acid, citric acid, etc.
Organic acids can be used, but phosphoric acid is preferred.
You. Phosphoric acid includes orthophosphoric acid, metaphosphoric acid, polyphosphoric acid,
These salts may be used. Furthermore, iminodiacetic acid, d
Complexing agents such as tylenediaminetetraacetic acid can also be mixed.
You. In addition, inorganic fine particles such as colloidal silica
Mix as long as the action of the compound having
Rukoto can. In the present invention, the plate surface treatment liquid may be oil-sensitive.
Used as a chemical solution or a neutralization stabilizing solution. Neutralization stabilizer
When used in this way, of course,
And a coating process having a coating mechanism in the actual plate making process.
It works in a logical manner. That is, members constituting the coating section, for example, coating
Rollers and other water-free water containing mercapto or thione groups
Precipitation of soluble compounds, neutralization dissolved in conventional organic solvents
Solution or neutralized solution dissolved only with amine compound,
Notably reduced. In the present invention, a processing apparatus having a coating mechanism
As described above, Japanese Patent Application Laid-Open Nos. 4-307245 and 6-
27682, and coating described in JP-A-7-175219.
An apparatus having a roller is exemplified. These devices are developed
Process and neutralization stabilization process are performed continuously.
Has a coating mechanism for development and neutralization even in light
It is preferable to use a processing method. Lithographic plate utilizing image silver as ink acceptability
Regarding the printing plate, the silver halide emulsion is the printing plate itself
Or an image receiving layer by silver diffusion transfer method.
Another negative source as a silver source for the
It may be provided on a sheet. The silver halide emulsion includes silver chloride, silver bromide,
Either silver chlorobromide or those containing iodide
This binder is preferably gelatin, but
Some or all of the tin may be replaced by other colloidal substances, such as casei
, Albumin, cellulose derivatives, etc.
No. Silver halide is 0.5-7 g / m in terms of silver nitrate
^Two , Binder is 0.5-10g / m ^Two Usually used in the range
You can do it. The method for producing a silver halide emulsion is described in a conventional photographic method.
It can be manufactured by methods known in the industry, especially for printing plates.
Manufacturing methods for use are also disclosed in the above-mentioned known patent documents.
Can be used as a reference. The lithographic printing plate used in the present invention generally has
After exposure, it is processed with an alkali developing solution. Such a developer is
Normal photographic development with a developing agent such as idroquinone
Solution of silver diffusion transfer method containing liquid, hypo or the like
Any activator such as a high alkali developer
Anything can be used. EXAMPLES The present invention will be described below with reference to examples.
However, the present invention is not limited to this. Example 1 A flat surface of a polyester film support subjected to an undercoating treatment was
A matted layer containing silica particles having a uniform particle size of 5μ
Provide the amount of carbon on the opposite side that gives a light reflectance of 3%
Contains black, 20% by weight of photographic gelatin
Under halation prevention containing silica powder with average particle size of 7μ
Coating layer (adjusted to pH 4), average grain after chemical sensitization
5% by weight of silica powder having a diameter of 7μ based on photographic gelatin
Sensitivity sensitized spectrally sensitized to the green region containing
Silver emulsion (adjusted to pH 4). The gelatin of the undercoat layer was 3.5 g / m ^Two ,milk
0.8 g / m2 gelatin in the agent layer ^Two , Converted to silver nitrate
1.0 g / m ^Two At a rate of Under this
Formalin and gelatin are used as hardeners in the coating and emulsion layers.
On the other hand, it contains 5.0 mg / g gelatin. After drying
After heating at 40 ° C. for 5 days, the emulsion layer was
No. 54-103104, plate no.
31.Apply the core coating solution described in 31 and dry to produce a lithographic printing plate.
You. The silver halide emulsion contains one silver halide emulsion at the time of physical ripening.
4 × 10 per mole ^-6 With the addition of molar rhodium chloride
The average particle size was 0.4 microns. The lithographic printing plate precursor thus obtained is
Image exposure using a plate making camera with an image reversing mechanism
Developing treatment was performed at 30 ° C. for 30 seconds using the liquid (used liquid). <Developer> Sodium hydroxide 24 g Potassium hydroxide 8 g Anhydrous sodium sulfite 50 g 2-Methyl-2-amino-1-fluoroethanol 30 g Mercapto compound 0.2 g Make up to 1 l with water. The mercapto compound is 2-mercapto-
5-n-heptyl-oxadiazole. After the above development processing, neutralization as shown below
Liquid (stable liquid) fresh liquid (immediately after preparation) at room temperature for 20
Processed for seconds. Add the following neutralizing solution (stabilizing solution)
Place in a plastic container and conduct a one-month aging test at 5 ° C.
Perform the same treatment, print test and precipitation of mercapto compound
The presence or absence of was examined. Development and neutralization stabilization processing
Plate making camera processor CP-550II manufactured by KK
(Immersion development system). <Neutralizing solution> Phosphoric acid 1.2 g Sodium monophosphate 25 g Anhydrous sodium sulfite 2.5 g Ethylene glycol 5 g Mercapto compound 0.2 g Diethanolamine 5 g Compound A 0.2 g Make up to 1 l with water. (Adjusted to pH 6) Combinations of mercapto compounds and Compound A are as shown in Table 1.
It is. The printing plate created by the above operation is
Set on a printing press, and put an AB Dic 12 on the printing press.
50 (trademark of offset printing machine manufactured by AB-Dick),
The ink is AB-Dick3-1012 black ink, moisture supply
Use OD30 (humidifying liquid manufactured by Mitsubishi Paper Mills) for the tap water
Etching was performed and printing was performed. [Table 1] The surfactant H in the table is β-naphthalene
Sodium sulfonate formalin condensate, SH1 is 2-merca
Put-5-n-heptyl-oxadiazole, SH2
3-pentyl-benzoxazoline-2-thione
You. The ink acceptability was evaluated by contacting the plate surface with the ink.
Touch the paper as soon as you touch it,
Evaluated as the number of prints until a print without unevenness is obtained
did. Table 2 shows the printing results and the results of the aging test. [Table 2] According to an embodiment of the present invention, ink acceptability
, A neutralized solution having excellent aging properties was obtained. Example 2 The same procedure as in Example 1 was carried out except that the developer of Example 1 and the following neutralizing solution were used.
In the same way, a printing plate was prepared. <Neutralized solution> Phosphoric acid 1.2 g Sodium monophosphate 25 g Ethylene glycol 5 g Make up to 1 l with water. (Adjusted to pH 6) The printing plate prepared as described above was
Etching with the sensitizing liquid (etching liquid) shown in
The same printing test as in Example 1 was performed. In addition, the aging of the etchant
The test was performed in the same manner as in Example 1, and the solution after aging
And a similar printing test was performed. <Etch solution> Monosodium phosphate 15 g Colloidal silica (20% solution) 10 g Mercapto compound 0.5 g Diethanolamine 10 g Compound A 0.5 g Make up to 1 l with water. (Adjusted to pH 6) Combination of mercapto compound and compound A
Is according to the first embodiment. Printing results and precipitation at low temperature
In the state, almost the same result as in Example 1 was obtained, and the effect of the present invention was obtained.
The fruit was proved. (Reference Example) The neutralized solution of the present invention 1 in Example 1
In place of the mercapto compound SH1,
Using the compound No. 7, an ink receptivity test was performed. So
Table 3 shows the results. The neutralization solution containing the compound represented by the formula
Ink acceptance at the start of printing is inferior to the neutralizing solution of No. 1,
It is further reduced by air oxidation over time. Embedded image [Table 3] Embodiment 3 A processing apparatus having a coating mechanism is disclosed in Japanese Patent Application Laid-Open No. 7-1752.
The device described in No. 19 was prepared. Lithographic printing plate, developer and
The same neutralization stabilizer as in Example 1 was used. Plate size 2
10 sheets of 54 × 400 mm at 10 minute intervals
Deposits on the roller during the round treatment were observed. The result
As a result, when the neutralized solutions of Comparative Examples 2 and 3 were used, a considerable amount of precipitate was obtained.
However, when the neutralized solution of the present invention was used,
No precipitate was observed. According to the present invention, the image silver can be converted to the ink acceptability.
Plate processing solution for lithographic printing plates used as
Water-insoluble compounds having a mercapto group or a thione group
Products can be stably contained,
Precipitation can be prevented. In this way, always stable ink
Acceptability can be obtained. Also, the plate surface treatment solution is neutralized.
When applied to a processing method with a coating mechanism as a liquid,
Precipitation of the deposit on the application roller can be prevented.

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Claims (1)

(57) [Claims 1] An amine compound , at least one water-insoluble compound having one mercapto group or thione group, and one selected from the following (1) to (4): A surface treatment solution for a lithographic printing plate utilizing image silver as ink acceptability, characterized by containing at least one compound. (1) a water-soluble polymer having a number average molecular weight of about 20,000 or less having a carboxy group (2) an aromatic sulfonic acid formalin condensate (3) an anionic surfactant having a polyoxyethylene group (4) an organic disulfide compound