JP2020104338A - Dampening water composition for lithographic printing, method for producing lithographic printing plate, and lithographic printing method - Google Patents

Abstract

To provide a dampening water composition for lithographic printing, which is excellent in suppression of stain of dampening water and is excellent in ink acceptability of a lithographic printing plate to be obtained; a method for producing a lithographic printing plate using the dampening water composition for lithographic printing; and a lithographic printing method.SOLUTION: The dampening water composition for lithographic printing includes a polymer that has at least one structure selected from the group consisting of a polyallylamine structure, a polyallylamine salt structure, a polydiallylamine structure, and a polydiallylamine salt structure. The method for producing the lithographic printing plate and the lithographic printing method use the dampening water composition for lithographic printing.SELECTED DRAWING: None

Description

The present disclosure relates to a fountain solution composition for lithographic printing, a method for preparing a lithographic printing plate, and a lithographic printing method.

In general, a lithographic printing plate comprises a lipophilic image area that receives ink during the printing process and a hydrophilic non-image area that receives fountain solution. In lithographic printing, the lipophilic image part of the lithographic printing plate is used as the ink receiving part, and the hydrophilic non-image part is dampening water receiving part (ink non-receiving part) by utilizing the property that water and oil-based ink repel each other. As a method, a difference in ink adhesion is caused on the surface of the lithographic printing plate, the ink is applied only to the image area, and then the ink is transferred to a printing medium such as paper for printing. In lithographic printing, the non-image area is moistened with dampening water to increase the surface chemical difference between the image area and the non-image area, and the ink repulsion of the non-image area and the ink receptivity of the image area are increased. It will be increased.
In order to produce this lithographic printing plate, a lithographic printing plate precursor (PS plate, presensitized plate) in which a lipophilic photosensitive resin (image recording layer) is provided on a hydrophilic support has been widely used. .. Such a lithographic printing plate precursor is exposed through an original image such as a lith film, and then a portion to be an image portion of the image recording layer is left, and an unnecessary image recording layer other than that is treated with an alkaline developer or an organic solvent. A planographic printing plate is obtained by making a plate by a method of dissolving and removing with a solvent and exposing the surface of a hydrophilic support to form a non-image area.

On the other hand, in recent years, digitization technology for electronically processing, accumulating and outputting image information by a computer has become widespread, and various new image output methods corresponding to such digitization technology will be put to practical use. Is becoming. Along with this, the digitized image information is carried by radiation of high convergence such as laser light, and the lithographic printing plate precursor is scanned and exposed by the light, and the lithographic printing plate is directly exposed without passing through the lithographic film. Computer to plate (CTP) technology for manufacturing piezo has become widespread.
In addition, after exposing the lithographic printing plate precursor, a step of dissolving and removing an unnecessary image recording layer with a developing solution or the like is performed, but it is unnecessary to simplify or simplify such an additional wet treatment. Have also been considered. As one of such simple plate-making methods, an image recording layer that can remove unnecessary portions of the lithographic printing plate precursor during a normal printing process is used, and after exposure, non-image areas are removed on a printing machine. However, a method called on-press development for obtaining a lithographic printing plate has been proposed. As a specific method of on-press development, for example, a fountain solution, a method of using a lithographic printing plate precursor having an image recording layer capable of being dissolved or dispersed in an emulsion of an ink solvent or fountain solution and an ink, A method of mechanically removing the image recording layer by contact with the rollers or blanket of the printing machine, cohesive force of the image recording layer by permeation of dampening water, ink solvent, etc. or adhesive force between the image recording layer and the support. After weakening, the image recording layer may be mechanically removed by contact with rollers or a blanket cylinder.

As a conventional fountain solution composition for lithographic printing or a method of using the same, for example, those described in Patent Documents 1 and 2 are known.
Patent Document 1 is characterized by containing a compound having at least one group selected from an amino group and an imino group capable of Michael addition to an ethylenically unsaturated double bond in the molecule, and a dampener for a lithographic printing plate. Water is listed.
Further, Patent Document 2 discloses a method of using a polymer for the production of a fountain solution or a fountain solution concentrate for offset printing, which comprises at least one polymer P having an amino group modified with an acid group as a monomer. Are described.

JP, 2004-243582, A Japanese Patent Publication No. 2008-521640

The problem to be solved by the embodiments of the present disclosure is to provide a fountain solution composition for lithographic printing, which is excellent in suppression of dampening water stains and excellent in ink receptivity of the resulting lithographic printing plate.
A problem to be solved by another embodiment of the present invention is to provide a method for producing a lithographic printing plate using the fountain solution composition for lithographic printing, and a lithographic printing method.

Means for solving the above problems include the following aspects.
<1> A fountain solution composition for lithographic printing containing a polymer having at least one structure selected from the group consisting of a polyallylamine structure, a polyallylamine salt structure, a polydiallylamine structure, and a polydiallylamine salt structure.
<2> The fountain solution composition for lithographic printing according to <1>, wherein the polymer contains a polymer having a polyallylamine structure and at least one structure selected from the group consisting of polyallylamine salt structures.
<3> The polymer is selected from the group consisting of structural units represented by the following formula (1) and structural units represented by the following formula (2) as the polyallylamine structure or polyallylamine salt structure. The fountain solution composition for lithographic printing according to <2>, which comprises a polymer having at least one structural unit.

In formulas (1) and (2), R _{1 to} R ₅ each independently represent a hydrogen atom, an alkyl group, an alkylcarbonyl group, an alkoxycarbonyl group, or an aminocarbonyl group, and X ₁ ⁻ is a counter anion. Represents.

<4> The planographic printing plate according to any one of <1> to <3>, in which the polymer includes a polymer having a polydiallylamine structure and at least one structure selected from the group consisting of polydiallylamine salt structures. A fountain solution composition for printing.
<5> The polymer is selected from the group consisting of structural units represented by the following formula (3) and structural units represented by the following formula (4) as the polydiallylamine structure or polydiallylamine salt structure. The fountain solution composition for lithographic printing according to <4>, which comprises a polymer having at least one structural unit.

In formulas (3) and (4), R _{6 to} R ₈ each independently represent a hydrogen atom, an alkyl group, a hydroxypropyl group, or a chlorohydroxypropyl group, and X ₂ ⁻ represents a counter anion.

<6> The fountain solution composition for lithographic printing according to <5>, wherein the polymer includes a polymer having a structure represented by the formula (4) as the polydiallylamine salt structure.
<7> R ₇ in the above formula (4) is an alkyl group having 1 to 3 carbon atoms, a hydroxypropyl group, or a chlorohydroxypropyl group, and R ₈ is a hydrogen atom or having 1 to 3 carbon atoms. The fountain solution composition for lithographic printing according to <6>, which is an alkyl group.
<8> For lithographic printing according to any one of <1> to <7>, in which the content of the polymer is 0.001% to 2% by mass based on the total mass of the fountain solution composition. Fountain solution composition.
<9> A step of exposing a lithographic printing plate precursor imagewise to form an exposed portion and an unexposed portion, and the fountain solution for lithographic printing according to any one of <1> to <8>. A method of producing a lithographic printing plate, comprising the steps of supplying a composition or a diluted composition obtained by diluting the fountain solution for lithographic printing to perform on-press development to obtain a lithographic printing plate.
<10> The lithographic printing plate as described in <9>, wherein in the step of performing on-press development to obtain a lithographic printing plate, a diluted composition prepared by diluting the fountain solution for lithographic printing in a volume ratio of 25 to 200 volumes Manufacturing method.
<11> The pH of the lithographic fountain solution composition or the diluted composition used in the step of obtaining the lithographic printing plate by performing the on-press development is 3 to 9, and <9> or <10> Method of making a lithographic printing plate.
<12> A fountain solution composition for lithographic printing according to any one of <1> to <8>, which comprises exposing the lithographic printing plate precursor imagewise to form exposed and unexposed portions. Alternatively, a step of supplying a diluted composition obtained by diluting the dampening water composition for lithographic printing to obtain a lithographic printing plate by on-press development, and the lithographic printing plate, and the dampening water composition for lithographic printing or the above. A lithographic printing method comprising a step of printing using a diluted composition and a printing ink.
<13> The lithographic printing method according to <12>, wherein in the printing step, a diluted composition prepared by diluting the fountain solution composition for lithographic printing in a volume of 25 to 200 volumes is used.
<14> The lithographic printing method according to <12> or <13>, wherein the fountain solution composition for lithographic printing or the diluted composition used in the printing step has a pH of 3 to 9.

According to the embodiment of the present disclosure, it is possible to provide a fountain solution composition for lithographic printing, which is excellent in the suppression of dampening water stains and is excellent in ink receptivity of the lithographic printing plate obtained.
Further, according to another embodiment of the present invention, it is possible to provide a method for producing a lithographic printing plate using the fountain solution composition for lithographic printing and a lithographic printing method.

The details of the present disclosure will be described below. The description of the constituents described below may be made based on the representative embodiment of the present disclosure, but the present disclosure is not limited to such an embodiment.
In addition, in this indication, "-" which shows a numerical range is used in the meaning including the numerical value described before and after that as a lower limit and an upper limit.
In the numerical ranges described stepwise in the present disclosure, the upper limit value or the lower limit value described in one numerical range may be replaced with the upper limit value or the lower limit value of the numerical range described in other stages. .. Further, in the numerical range described in the present disclosure, the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the examples.
Further, in the present disclosure, the amount of each component in the composition is the total amount of the corresponding substances present in the composition unless a plurality of substances corresponding to each component are present in the composition. Means
In addition, in the notation of a group (atomic group) in the present disclosure, the notation that does not indicate substituted and unsubstituted includes not only those having no substituent but also those having a substituent. For example, the “alkyl group” includes not only an alkyl group having no substituent (unsubstituted alkyl group) but also an alkyl group having a substituent (substituted alkyl group).
In the present disclosure, “(meth)acrylic” is a term used as a concept including both acryl and methacryl, and “(meth)acryloyl” is a term used as a concept including both acryloyl and methacryloyl. is there.
Further, in the present disclosure, with respect to the notation of the group in the compound represented by the formula, when substitution or non-substitution is not described, and when the group can further have a substituent, there is no particular limitation. As long as the group includes not only an unsubstituted group but also a group having a substituent. For example, in the formula, if “R represents an alkyl group, an aryl group or a heterocyclic group” is described, “R represents an unsubstituted alkyl group, a substituted alkyl group, an unsubstituted aryl group, a substituted aryl group, an unsubstituted group. "Represents a heterocyclic group or a substituted heterocyclic group".
Further, the term “process” in the present disclosure is included in the term not only as an independent process but also when it cannot be clearly distinguished from other processes as long as the intended purpose of the process is achieved. Be done.
Moreover, in this indication, "mass %" and "weight%" are synonymous, and "mass part" and "weight part" are synonymous.
Furthermore, in the present disclosure, a combination of two or more preferable aspects is a more preferable aspect.
In addition, the weight average molecular weight (Mw) and the number average molecular weight (Mn) in the present disclosure are columns of TSKgel GMHxL, TSKgel G4000HxL, and TSKgel G2000HxL (both manufactured by Tosoh Corporation) unless otherwise specified. The gel permeation chromatography (GPC) analyzer was used to detect the solvent THF (tetrahydrofuran) with a differential refractometer, and the molecular weight was calculated using polystyrene as a standard substance.
Regarding the specific polymer described below, Mw and Mn are measured by the measurement method described below.
In the present disclosure, the total solid content refers to the total mass of components in the composition excluding volatile components such as a solvent.
In the present disclosure, the term “lithographic printing plate precursor” includes not only the lithographic printing plate precursor but also the discarded plate precursor. Further, the term "lithographic printing plate" includes not only a lithographic printing plate precursor prepared through an operation such as exposure and development, but also a discarding plate, if necessary. In the case of a waste original plate, the operations of exposure and development are not always necessary. The waste plate is a lithographic printing plate precursor to be attached to a plate cylinder that is not used, for example, when a part of the paper surface is printed in a single color or two colors in color newspaper printing.
Hereinafter, the present disclosure will be described in detail.

(Dampening water composition for lithographic printing)
A fountain solution composition for lithographic printing according to the present disclosure (hereinafter, also simply referred to as “fountain solution composition”) comprises a polyallylamine structure, a polyallylamine salt structure, a polydiallylamine structure, and a polydiallylamine salt structure. It contains a polymer having at least one structure selected from the group.
Further, the fountain solution composition for lithographic printing according to the present disclosure can also be used in a method of preparing a lithographic printing plate to be developed with a developer and a lithographic printing method, and a method of preparing a lithographic printing plate to be subjected to on-press development and a lithographic printing method. It can be preferably used also in the method. Among them, the fountain solution composition for lithographic printing according to the present disclosure can be particularly preferably used as a fountain solution composition for lithographic printing which is subjected to on-press development.
The fountain solution is often concentrated and commercialized when it is used as a commercial base, and when used, such a concentrated solution is appropriately diluted and used as the fountain solution.
The fountain solution composition for lithographic printing according to the present disclosure may be used as a fountain solution as it is or may be diluted and used.

In the conventional fountain solution composition for lithographic printing, it was difficult to achieve both compatibility between dampening solution stain and ink receptivity of the resulting lithographic printing plate.
As a result of diligent studies by the present inventors, it is possible to provide a dampening water composition for lithographic printing having the above-described structure, which is excellent in suppressing fountain solution stains and which is excellent in ink receptivity of the lithographic printing plate obtained. Found.
Although the mechanism of action of the excellent effect of the above configuration is not clear, it is estimated as follows.
The lithographic printing fountain solution composition contains a polymer having at least one structure selected from the group consisting of a polyallylamine structure, a polyallylamine salt structure, a polydiallylamine structure, and a polydiallylamine salt structure. In lithographic printing using the on-press development type lithographic printing plate precursor, the image recording layer removed by on-press development, the components in the ink and the development residue in the dampening water caused by the dampening water contamination due to the emulsification of the ink etc. Of the ink, the polymer is less likely to adhere to the image area surface, and the deposition of the polymer on the roller is suppressed. It is considered that the receptivity is enhanced, a high-quality printed matter having a high ink density can be obtained even when a large number of sheets are continuously printed, and the lithographic printing plate obtained has excellent ink receptivity.

Further, the dampening water composition for lithographic printing according to the present disclosure contains the above-mentioned polymer, so that the generation amount of development residue in the dampening water is reduced, and the dampening water filter used when circulating the dampening water. It is presumed that it is also excellent in the clogging suppression property.
Further, the dampening water composition for lithographic printing according to the present disclosure contains the above-mentioned polymer, so that the generation amount of the development residue in the dampening water is reduced, and the accumulation of the above-mentioned polymer on the roller is suppressed, and it is continuous. It is estimated that the printing stability is also excellent.
Furthermore, the fountain solution composition for lithographic printing according to the present disclosure, by containing the above polymer, is excellent in the removability of the image recording layer in the non-image area during on-press development, and is also excellent in on-press developability. I'm estimating.

Further, the fountain solution composition for lithographic printing according to the present disclosure, in the printing operation, without the need for specialized skill, in a printing machine of any mechanism, highly volatile solvent components such as isopropyl alcohol. Even if it is not used, good printability is exhibited, the amount of organic solvent used can be reduced, and it is environmentally preferable.

Hereinafter, details of each constituent element included in the fountain solution composition for lithographic printing according to the present disclosure will be described.

<Specific polymer>
The fountain solution composition for lithographic printing according to the present disclosure is a polymer having at least one structure selected from the group consisting of polyallylamine structure, polyallylamine salt structure, polydiallylamine structure, and polydiallylamine salt structure (“ Also referred to as "specific polymer").
The specific polymer may have one type of the above structure or may have two or more types.
The specific polymer includes a polymer having at least one structure selected from the group consisting of a polyallylamine structure and a polyallylamine salt structure, from the viewpoint of the balance between hydrophilicity and hydrophobicity, and ink receptivity. It is preferable, and it is more preferable to include a polymer having a polyallylamine salt structure.
Further, the specific polymer is a polymer having at least one structure selected from the group consisting of a polydiallylamine structure and a polydiallylamine salt structure, from the viewpoints of dampening water contamination suppression properties and ink receptivity. And a polymer having a polydiallylamine salt structure is more preferable.
Further, the specific polymer is selected from the group consisting of a polyallylamine salt structure and a polydiallylamine salt structure from the viewpoints of hydrophilicity and hydrophobicity balance, dampening water contamination controllability, and ink receptivity. It is preferable to include a polymer having at least one kind of structure, and it is more preferable to include a polymer having a polydiallylamine salt structure.
The polyallylamine structure and the polyallylamine salt structure are preferably structures having at least one hydrogen atom on the nitrogen atom.

Examples of the polymer having a polyallylamine structure or a polyallylamine salt structure include allylamine polymers, allylamine hydrochloride polymers, allylamine amide sulfate polymers, allylamine acetate polymers, methoxycarboxyallylamine polymers, and uread allylamine polymers. Also, copolymers with allylamine compounds having different structures can be used.
Examples of the polymer having a polydiallylamine structure or a polydiallylamine salt structure include diallylamine polymers, diallylamine hydrochloride polymers, methyldiallylamine polymers, methyldiallylamine hydrochloride polymers, methyldiallylamineamide sulfate polymers, methyldiallylamine acetate polymers, dimethyldiallylammonium chloride polymers. , Methyl ethyl diallyl ammonium chloride polymer, methyl ethyl diallyl ammonium ammonium sulfate polymer, chlorohydroxypropylated diallylamine hydrochloride and the like. Further, a copolymer with a diallylamine compound having a different structure can also be used.
Further, a copolymer of an allylamine compound or a salt thereof and a diallylamine compound or a salt thereof is also preferable.
Further, an allylamine-allylamine salt copolymer or an allylamine salt polymer in which a part or all of the nitrogen atoms of polyallylamine are polymerized by polymerizing an allylamine compound is also preferred. The same applies to the diallylamine compound.

Further, a copolymer of at least one compound selected from the group consisting of an allylamine compound, an allylamine salt compound, a diallylamine compound and a diallylamine salt compound and another ethylenically unsaturated compound or sulfur dioxide is also preferred.
Other ethylenically unsaturated compounds are not particularly limited, but (meth)acrylic acid and (meth)acrylamide are preferable.
The specific polymer has at least one structure selected from the group consisting of a polyallylamine structure, a polyallylamine salt structure, a polydiallylamine structure, and a polydiallylamine salt structure, from the viewpoint of suppressing dampening water contamination. 20 mass% or more and 100 mass% or less, more preferably 35 mass% or more and 100 mass% or less, further preferably 50 mass% or more and 100 mass% or less, and 70 mass% It is particularly preferable that the content is 100% by mass or more and 100% by mass or less.

The specific polymer has a constitutional unit represented by the following formula (1) as the polyallylamine structure or a polyallylamine salt structure, and a formula ( It is preferable to include a polymer having at least one kind of constitutional unit selected from the group consisting of constitutional units represented by 2), and it is more preferable to include a polymer having a constitutional unit represented by the following formula (2). ..

In formulas (1) and (2), R _{1 to} R ₅ each independently represent a hydrogen atom, an alkyl group, an alkylcarbonyl group, an alkoxycarbonyl group, or an aminocarbonyl group, and X ₁ ⁻ is a counter anion. Represents.

R ₁ in the formula (1) is preferably a hydrogen atom, an alkylcarbonyl group, an alkoxycarbonyl group, or an aminocarbonyl group, from the viewpoints of dampening water contamination suppression properties and ink receptivity. More preferably, it is an atom.
R ₂ in formula (1) is preferably a hydrogen atom.
Each R ₃ and R ₄ independently in Formula (2), dampening inhibitory water pollution, and, in view of inking property, a hydrogen atom, or, preferably an alkyl group, R ₃ and R It is more preferable that both ₄ are hydrogen atoms or an alkyl group, and it is particularly preferable that both R ₃ and R ₄ are hydrogen atoms.
R ₅ in formula (2) is preferably a hydrogen atom.

X ₁ ⁻ in the formula (2) may be a monovalent counter anion or a polyvalent counter anion, but is preferably a monovalent counter anion.
Further, when R ₅ is a hydrogen atom, X ₁ ⁻ in the formula (2) is distributed as a HX _{1 on} the nitrogen atom even when X ₁ ⁻ is in a free state as described in the formula (2). It may be in a rank position.
X ₁ ⁻ is not particularly limited, and examples thereof include known inorganic acid or organic acid anions. Among them, X ₁ ⁻ is a halide ion, a sulfonate ion, a sulfate ion, an alkylsulfate ion, a carboxylic acid from the viewpoint of the balance between hydrophilicity and hydrophobicity, the suppression of dampening water contamination, and the ink receptivity. Ion, or is preferably a sulfamate ion, more preferably a halide ion, a carboxylate ion, or a sulfamate ion, more preferably a chloride ion, an acetate ion, or a sulfamate ion preferable.

The specific polymer has a constitutional unit represented by the following formula (3) as the above polydiallylamine structure or a polydiallylamine salt structure, and the following formula (from the viewpoint of suppressing fountain solution contamination and ink receptivity): It is preferable to include a polymer having at least one structural unit selected from the group consisting of structural units represented by 4), and it is more preferable to include a polymer having a structural unit represented by the following formula (4). ..

In formulas (3) and (4), R _{6 to} R ₈ each independently represent a hydrogen atom, an alkyl group, a hydroxypropyl group, or a chlorohydroxypropyl group, and X ₂ ⁻ represents a counter anion.

R ₆ in the formula (3) is an alkyl group having 1 to 3 carbon atoms, a hydroxypropyl group, or a chlorohydroxypropyl group from the viewpoints of dampening water contamination controllability and ink receptivity. A methyl group, a hydroxypropyl group, or a chlorohydroxypropyl group is particularly preferable.
R ₇ and R ₈ in the formula (4) are each independently an alkyl group having 1 to 3 carbon atoms, a hydroxypropyl group, or a chlorohydroxy group, from the viewpoints of dampening water contamination inhibitory properties and ink receptivity. A propyl group is preferable, and a methyl group, a hydroxypropyl group, or a chlorohydroxypropyl group is particularly preferable.
R ₇ in the formula (4) is an alkyl group having 1 to 3 carbon atoms, a hydroxypropyl group, or a chlorohydroxypropyl group, and R ₈ is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. Preferably.
When at least one of R ₇ and R ₈ in the formula (4) is a hydroxypropyl group or a chlorohydroxypropyl group, the other is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. Is preferred, and a hydrogen atom is more preferred.
Moreover, as the above-mentioned chlorohydroxypropyl group, a 3-chloro-2-hydroxypropyl group is preferably exemplified.

X ₂ ⁻ in the formula (4) may be a monovalent counter anion or a polyvalent counter anion, but is preferably a monovalent counter anion.
In addition, when R ₈ is a hydrogen atom, X ₂ ⁻ in the formula (4) is distributed as a HX _{2 on} the nitrogen atom even when X ₂ ⁻ is in a free state as described in the formula (4). It may be in a rank position.
X ₂ ⁻ is not particularly limited, and examples thereof include known inorganic acid or organic acid anions. Among them, X ₂ ⁻ is a halide ion, a sulfonate ion, a sulfate ion, an alkylsulfate ion, or a carboxylic acid from the viewpoint of the balance between hydrophilicity and hydrophobicity, the suppression of dampening water contamination, and the ink receptivity. Ion, or a sulfamate ion is preferable, a halide ion, an alkylsulfate ion, or a carboxylate ion is more preferable, and a chloride ion, an acetate ion, or an ethylsulfate ion is particularly preferable. preferable.

Further, the specific polymer is represented by any one of the above formulas (1) to (4) from the viewpoint of the balance of hydrophilicity and hydrophobicity, the suppression of dampening water contamination, and the ink receptivity. It is preferable to include a polymer having at least one kind of constitutional unit selected from the group consisting of units, and it comprises a constitutional unit represented by the above formula (2) and a constitutional unit represented by the above formula (4). It is more preferable to include a polymer having at least one structure selected from the group.
Furthermore, the content of the constituent unit represented by any one of the above formulas (1) to (4) in the polyallylamine structure, polyallylamine salt structure, polydiallylamine structure or polydiallylamine salt structure of the specific polymer is hydrophilic. And the balance of hydrophobicity, suppression of dampening water contamination, and from the viewpoint of ink receptivity, relative to the total mass of the polyallylamine structure, polyallylamine salt structure, polydiallylamine structure or polydiallylamine salt structure in the specific polymer. , 50% by mass or more and 100% by mass or less, more preferably 80% by mass or more and 100% by mass or less, further preferably 90% by mass or more and 100% by mass or less, 100% by mass, that is, It is particularly preferable that the polyallylamine structure, the polyallylamine salt structure, the polydiallylamine structure, or the polydiallylamine salt structure is a structure composed of the constitutional unit represented by any one of the above formulas (1) to (4).

A polymer having at least one constitutional unit selected from the group consisting of constitutional units represented by any one of the above formulas (1) to (4) is generally available on the market. In the present disclosure, commercially available products can be used as the specific polymer.

The weight average molecular weight (Mw) of the specific polymer is not particularly limited, but is preferably 1,000 or more and 500,000 or less, more preferably 1,500 or more and 200,000 or less, and 5,000 to. Particularly preferably, it is 100,000.
Moreover, the weight average molecular weight (Mw) and the number average molecular weight (Mn) of the specific polymer in this indication shall be measured by the following methods.
0.1M (mol/L) monosodium phosphate in the eluent using a Gel Filtration Chromatography (GFC) analyzer using columns of TSKgel G5000pwxl, TSKgel G3000pwxl, and TSKgel G2500pwxl (all are trade names of Tosoh Corp.) It is detected by an aqueous solution and a differential refractometer, converted using polyethylene glycol as a standard substance, and Mw or Mn of the specific polymer is measured.

The fountain solution composition according to the present disclosure may contain one specific polymer or two or more specific polymers.
The content of the specific polymer is preferably 0.001% by mass to 5% by mass with respect to the total mass of the dampening water composition, from the viewpoints of the dampening water contamination suppression property and the ink receptivity. , 0.001 mass% to 2 mass% is more preferable, and 0.005 mass% to 2 mass% is particularly preferable.
In addition, when the dampening water composition according to the present disclosure is used as it is as dampening water, or when the dampening water composition according to the present disclosure is prepared as a concentrated liquid and diluted and used as dampening water The content of the specific polymer is 0.001% by mass to 2% by mass with respect to the total mass of the dampening water composition or the dampening water, from the viewpoints of dampening water contamination suppression properties and ink receptivity. It is preferable that the amount is 0.001% by mass to 0.5% by mass, more preferably 0.005% by mass to 0.2% by mass. It is particularly preferable that the content is 0.01% by mass to 0.1% by mass.
Furthermore, the content of the specific polymer in the fountain solution composition when the fountain solution composition according to the present disclosure is prepared as a concentrated solution and diluted and used as fountain solution has a dampening solution contamination inhibitory property. From the viewpoint of ink receptivity, it is preferably 0.01% by mass to 5% by mass, and more preferably 0.02% by mass to 2% by mass, based on the total mass of the fountain solution composition. More preferably, it is particularly preferably 0.05% by mass to 1.0% by mass.

<water>
The fountain solution composition for lithographic printing according to the present disclosure may be a concentrated solution, and it is not essential to contain water, but it is preferable to contain water.
The water is not particularly limited, and tap water, well water, distilled water, ion-exchanged water, pure water, or the like can be used. Above all, it is preferable to use distilled water, ion-exchanged water, or pure water.
The content of water is the balance other than the specific polymer and each component described below, but is preferably 10% by mass or more and 20% by mass or more and 99.99% with respect to the total mass of the fountain solution composition. It is more preferably not more than 30% by mass, further preferably not less than 30% by mass and not more than 99.9% by mass, and particularly preferably not less than 40% by mass and not more than 99% by mass.
When the fountain solution composition for lithographic printing according to the present disclosure is a concentrated solution, it is preferably diluted with water to about 5 to 1,000 volume times and used as fountain solution at the time of use. ..

<Solvent>
The fountain solution composition for lithographic printing according to the present disclosure preferably contains a solvent.
As the solvent, an organic solvent is preferable, and a known organic solvent can be used.
Further, the solvent is preferably a compound which is a liquid at 1 atm and 20°C.
Further, the solvent preferably contains a compound having a boiling point of 150° C. or higher, more preferably a compound having a boiling point of 150° C. or higher and 300° C. or lower, and a boiling point of 150° C. or higher from the viewpoint of water supply to the fountain solution plate. It is more preferable to include a compound having a temperature of 250° C. or lower, and it is particularly preferable to include a compound having a boiling point of 150° C. or higher and 200° C. or lower.
The solvent preferably has a function of increasing the water supply to the plate of the dampening water and can substitute for isopropyl alcohol, which is often added to the conventional dampening water.

Preferred examples of the organic solvent include compounds represented by the following formula (solA).
R ^sol O(CH ₂ CH(CH ₃ )O) _msol H formula (solA)
In formula (solA), R ^sol represents an alkyl group having 1 to 4 carbon atoms (number of carbon atoms), and m ^sol represents an integer of 1 to 3.
In formula (solA), R ^sol may be a linear alkyl group or a branched alkyl group.
Among them, R ^sol is preferably an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, an s-butyl group, or a t-butyl group.

Specific examples of the compound represented by the formula (solA) include dipropylene glycol monopropyl ether, tripropylene glycol monopropyl ether, dipropylene glycol monoisopropyl ether, tripropylene glycol monoisopropyl ether, propylene glycol monobutyl ether, and dipropylene glycol monobutyl ether. Propylene glycol monobutyl ether, tripropylene glycol monobutyl ether, propylene glycol monoisobutyl ether, dipropylene glycol monoisobutyl ether, tripropylene glycol monoisobutyl ether, propylene glycol monotertiary butyl ether, dipropylene glycol monotertiary butyl ether, tripropylene glycol mono Examples include tertiary butyl ether. Among them, as the solvent, at least one selected from the group consisting of propylene glycol monobutyl ether, propylene glycol monotertiary butyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monobutyl ether, and dipropylene glycol monotertiary butyl ether. It is preferable to include a compound.

Further, as the organic solvent, a compound represented by the following formula (solB) is preferably exemplified.
HO(CH ₂ CH(CH ₃ )O) _nsol H formula (solB)
In formula (solB), nsol represents an integer of 1 to 5.
Specific preferred examples of the compound represented by the formula (solB) include propylene glycol, dipropylene glycol, and tripropylene glycol.

Further, as the organic solvent, 2-ethyl-1,3-hexanediol, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, triethylene glycol monomethyl ether, polyethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monoethyl ether, tri Ethylene glycol monoethyl ether, ethylene glycol monoisobutyl ether, diethylene glycol monoisobutyl ether, triethylene glycol monoisobutyl ether, ethylene glycol monopropyl ether, diethylene glycol monopropyl ether, triethylene glycol monopropyl ether, ethylene glycol monobutyl ether, ethylene glycol mono Tertiary butyl ether, diethylene glycol monobutyl ether, diethylene glycol monotertiary butyl ether, triethylene glycol monobutyl ether, triethylene glycol monotertiary butyl ether, 3-methoxy-3-methylbutanol, 3-methoxybutanol, trimethylolpropane, molecular weight 200- 1,000 polypropylene glycol and monomethyl ether, monoethyl ether, monopropyl ether, monoisopropyl ether, monobutyl ether, monoisobutyl ether, monotertiary butyl ether, etc. of these compounds are mentioned.

The fountain solution composition according to the present disclosure may contain one kind of solvent alone or may contain two or more kinds of solvents. From the viewpoint of suppressing the contamination, it is preferable that two or more kinds are contained, and it is more preferable that two kinds to four kinds are contained.
The content of the solvent is preferably 0.05% by mass to 70% by mass, and more preferably 0.2% by mass to 60% by mass, based on the total mass of the fountain solution composition.
In addition, when the dampening water composition according to the present disclosure is used as it is as dampening water, or when the dampening water composition according to the present disclosure is prepared as a concentrated liquid and diluted and used as dampening water The content of the solvent is preferably 0.05% by mass to 10% by mass, and more preferably 0.2% by mass to 4% by mass, based on the total mass of the dampening water.

<Water-soluble polymer compound>
The fountain solution composition for lithographic printing according to the present disclosure preferably contains a water-soluble polymer compound from the viewpoint of stain resistance of the non-image area.
Specific examples of the water-soluble polymer compound include gum arabic, starch derivatives (for example, dextrin, enzyme-degraded dextrin, hydroxypropylated enzyme-degraded dextrin, carboxymethylated starch, phosphoric acid starch, octenyl succinated starch, etc.), alginates, and fibrin. Natural products of derivatives (for example, carboxymethyl cellulose, carboxyethyl cellulose, hydroxyethyl cellulose, methyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, their glyoxal modified products, etc.) and their modified products, polyvinyl alcohol and its derivatives, polyvinylpyrrolidone, polyacrylamide and its Examples thereof include copolymers, polyacrylic acid and its copolymers, vinyl methyl ether/maleic anhydride copolymers, and vinyl acetate/maleic anhydride copolymers.
Among the above water-soluble polymer compounds, at least one compound selected from the group consisting of hydroxypropylcellulose, hydroxypropylmethylcellulose, and polyvinylpyrrolidone is particularly preferable.

The fountain solution composition according to the present disclosure may contain one type of water-soluble polymer compound or two or more types thereof.
The content of the water-soluble polymer compound is preferably 0.0001% by mass to 5% by mass, more preferably 0.001% by mass to 1% by mass, based on the total mass of the fountain solution composition. It is particularly preferably 0.003% by mass to 1% by mass.
In addition, when the dampening water composition according to the present disclosure is used as it is as dampening water, or when the dampening water composition according to the present disclosure is prepared as a concentrated liquid and diluted and used as dampening water The content of the water-soluble polymer compound is preferably 0.0001% by mass to 1% by mass with respect to the total mass of the dampening water composition or the dampening water, from the viewpoint of suppressing dampening water contamination. , 0.001 mass% to 0.3 mass% is more preferable, and 0.005 mass% to 0.2 mass% is particularly preferable.

<Acidic compound (pH adjuster)>
The fountain solution composition for lithographic printing according to the present disclosure preferably contains an acidic compound from the viewpoint of adjusting the pH in the acidic region.
Examples of the acidic compound include organic acids, inorganic acids, and salts thereof. Among them, the acidic compound preferably contains an organic acid or a salt thereof, and more preferably contains an organic acid.
Examples of the organic acid include citric acid, maleic acid, fumaric acid, succinic acid, adipic acid, glutaric acid, ascorbic acid, malic acid, tartaric acid, propionic acid, lactic acid, acetic acid, glycolic acid, gluconic acid, oxalic acid, and malonic acid. , Levulinic acid, sulfanilic acid, p-toluenesulfonic acid, phytic acid, organic phosphonic acid and the like.
Examples of the inorganic acid include phosphoric acid, nitric acid, sulfuric acid, polyphosphoric acid and the like.
Further, alkali metal salts, alkaline earth metal salts, ammonium salts, or organic amine salts of these organic acids or inorganic acids are also suitably used.

The fountain solution composition according to the present disclosure may contain one type of acidic compound or two or more types of acidic compounds.
The content of the acidic compound is preferably 0.001% by mass to 5% by mass with respect to the total mass of the fountain solution composition.

<Basic compound (pH adjuster)>
Further, the fountain solution composition for lithographic printing according to the present disclosure may contain a basic compound such as an alkali metal hydroxide, an alkali metal phosphate, an alkali metal carbonate or a silicate from the viewpoint of pH adjustment. Well, for example, it can also be used as a fountain solution in a neutral to alkaline region around pH 7 to 11.

The fountain solution composition according to the present disclosure may contain one basic compound or two or more basic compounds.
The content of the basic compound is preferably 0.001% by mass to 5% by mass with respect to the total mass of the fountain solution composition.

<Chelate compound>
The fountain solution composition for lithographic printing according to the present disclosure preferably contains a chelate compound.
When the dampening water composition according to the present disclosure is diluted by adding tap water, well water, etc., and used as dampening water, by containing a chelate compound, calcium ions contained in tap water or well water to be diluted It is possible to suppress the influence of the above on the printing and to prevent the stains on the printed matter.
Examples of the chelate compound include 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. , Its potassium salt, its sodium salt; nitrilotriacetic acid, its potassium salt, its sodium salt; 1,2-diaminocyclohexanetetraacetic acid, its potassium salt, its sodium salt; 1,3-diamino-2-propanoltetraacetic acid, its Aminopolycarboxylic acids such as potassium salt, sodium salt thereof, and 2-phosphonobutanetricarboxylic acid-1,2,4, potassium salt thereof, sodium salt thereof; 2-phosphonobutanetricarboxylic acid-2,3,4 , Its potassium salt, its sodium salt; 1-phosphonoethanetricarboxylic acid-1,2,2, its potassium salt, its sodium salt; 1-hydroxyethane-1,1-diphosphonic acid, its potassium salt, its sodium salt The organic phosphonic acids or phosphonoalkane tricarboxylic acids such as aminotri(methylenephosphonic acid), its potassium salt, its sodium salt and the like;
Instead of the sodium salt or potassium salt of the above chelating agent, a salt of ammonium or organic amine is also effective.

The fountain solution composition according to the present disclosure may contain one chelate compound or two or more chelate compounds.
The content of the basic compound is preferably 0.001% by mass to 3% by mass, more preferably 0.01% by mass to 1% by mass, based on the total mass of the fountain solution composition.

<Surfactant>
The fountain solution composition for lithographic printing according to the present disclosure preferably contains a surfactant from the viewpoint of improving wettability.
Examples of the surfactant include anionic surfactant, nonionic surfactant, cationic surfactant, and amphoteric surfactant.
Examples of the anionic surfactant include fatty acid salts, abietic acid salts, hydroxyalkanesulfonic acid salts, alkanesulfonic acid salts, dialkylsulfosuccinic acid salts, linear alkylbenzenesulfonic acid salts, branched chain alkylbenzenesulfonic acid salts, and alkylnaphthalenesulfone. Acid salts, alkylphenoxypolyoxyethylenepropyl sulfonates, polyoxyethylene alkylsulfophenyl ether salts, N-methyl-N-oleyl taurine sodium salts, N-alkylsulfosuccinic acid monoamide disodium salts, petroleum sulfonates, hydrogenated castor oil Sulfated tallow oil, fatty acid alkyl ester sulfate ester salts, alkyl sulfate ester salts, polyoxyethylene alkyl ether sulfate ester salts, fatty acid monoglyceride sulfate ester salts, polyoxyethylene alkylphenyl ether sulfate ester salts, polyoxyethylene styryl phenyl ether Sulfate ester salts, alkyl phosphate ester salts, polyoxyethylene alkyl ether phosphate ester salts, polyoxyethylene alkylphenyl ether phosphate ester salts, partially saponified styrene-maleic anhydride copolymers, olefin-maleic anhydride copolymers Partially saponified compounds, naphthalene sulfonate formalin condensates, and the like. Among them, dialkyl sulfosuccinates, alkyl sulfates and alkyl naphthalene sulfonates are particularly preferable.

As the nonionic surfactant, polyoxyalkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene polystyryl phenyl ether, polyoxyethylene polyoxypropylene alkyl ether, glycerin fatty acid partial esters, sorbitan fatty acid partial esters, Pentaerythritol fatty acid partial ester, propylene glycol monofatty acid partial ester, sucrose fatty acid partial ester, polyoxyethylene sorbitan fatty acid partial ester, polyoxyethylene sorbitol fatty acid partial ester, polyglycerin fatty acid partial ester, polyoxyethylenated Castor oils, polyoxyethylene glycerin fatty acid partial esters, fatty acid diethanolamides, N,N-bis-2-hydroxyalkylamines, polyoxyethylene alkylamines, triethanolamine fatty acid esters, trialkylamine oxides and the like can be mentioned. .. Among them, polyoxyethylene alkylphenyl ethers and polyoxyethylene-polyoxypropylene block polymers are preferable.

Examples of the cationic surfactant include alkylamine salts, quaternary ammonium salts, polyoxyethylene alkylamine salts, polyethylene polyamine derivatives and the like.
Examples of the amphoteric surfactant include alkyl imidazolines.
Furthermore, as the surfactant, a fluorine-based surfactant can be preferably used.
Fluorine-based anionic surfactants include perfluoroalkyl sulfonates, perfluoroalkyl carboxylates, perfluoroalkyl phosphates, and fluorine-based nonionic surfactants include perfluoroalkyl ethylene oxide adducts and perfluoroalkyl Examples include propylene oxide adducts.
Examples of the fluorinated cationic surfactant include perfluoroalkyl trimethyl ammonium salt.

The fountain solution composition according to the present disclosure may contain a single surfactant or may contain two or more surfactants.
The content of the surfactant is preferably 10% by mass or less, and more preferably 0.01% by mass to 3% by mass, based on the total mass of the fountain solution composition.

<Hydrotrope compound>
The fountain solution composition for lithographic printing according to the present disclosure preferably contains a hydrotrope compound from the viewpoint of reducing the viscosity of the composition and improving the solubility of components such as a solvent in water.
As the hydrotrope compound, aromatic sulfonates such as toluene sulfonate, xylene sulfonate and cumene sulfonate can be preferably used. Preferable examples of these salt structures include alkali metal salts, ammonium salts and amine salts.

The fountain solution composition according to the present disclosure may contain one kind of hydrotrope compound or two or more kinds thereof.
The content of the hydrotrope compound is preferably 0.001% by mass to 5% by mass, and more preferably 0.01% by mass to 3% by mass, based on the total mass of the fountain solution composition.

<Wetting agent>
The fountain solution composition for lithographic printing according to the present disclosure preferably contains a wetting agent from the viewpoint of improving wettability.
Preferable examples of the wetting agent include glycols and alcohols.
Examples of such a wetting agent include propylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol and pentapropylene glycol, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, butylene glycol, hexylene glycol, ethyl alcohol, n. -Propyl alcohol, benzyl alcohol, glycerin, diglycerin, polyglycerin, pentaerythritol and the like.

The fountain solution composition according to the present disclosure may contain one type of wetting agent or two or more types of wetting agents.
The content of the wetting agent is preferably 0.1% by mass to 3% by mass, and more preferably 0.3% by mass to 2% by mass, based on the total mass of the fountain solution composition.

The fountain solution composition for lithographic printing according to the present disclosure can completely replace isopropyl alcohol.
Further, even if isopropyl alcohol and ethanol, n-propanol, t-butanol, amyl alcohol and the like up to about 15% by mass of dampening water are used together, there is no problem in print quality.

<Diol compound>
The fountain solution composition for lithographic printing according to the present disclosure preferably contains a diol compound from the viewpoint of improving the solubility of other components and suppressing stains on the water supply roller.
As the diol compound, specifically, 2-butyl-2-ethyl-1,3-propanediol, 2,4-diethyl-1,5-pentanediol, 2-ethyl-1,3-hexanediol and the like are preferable. Can be mentioned.
Moreover, as the diol compound, the diol compounds described in JP-A-2009-96177 can be preferably used.
Further, as the diol compound, a diol compound having two hydroxy groups, the shortest carbon number between the two hydroxy groups is 2 to 6 and the total carbon number is 9 is particularly preferable. ..

The fountain solution composition according to the present disclosure may contain one kind of diol compound alone, or may contain two or more kinds thereof.
The content of the diol compound is preferably 0.001% by mass to 2% by mass, more preferably 0.005% by mass to 1% by mass, and more preferably 0% by mass with respect to the total mass of the fountain solution composition. It is more preferably 0.01% by mass to 0.7% by mass, and particularly preferably 0.02% by mass to 0.5% by mass.

<Pyrrolidone derivative>
The fountain solution composition for lithographic printing according to the present disclosure preferably contains a pyrrolidone derivative from the viewpoint of improving wettability.
Preferred examples of the pyrrolidone derivative include compounds represented by the following formula (pyr).

In the formula (pyr), R ^pyr represents an alkyl group having 2 to 12 carbon atoms.

Specific examples of the pyrrolidone derivative include ethylpyrrolidone, butylpyrrolidone, pentylpyrrolidone, hexylpyrrolidone, octylpyrrolidone, and laurylpyrrolidone. These compounds may be used alone or in combination of two or more.
Among these compounds, compounds in which R ^pyr in the formula (pyr) is an alkyl group having 6 or more carbon atoms are preferable, and octylpyrrolidone is particularly preferable.

The fountain solution composition according to the present disclosure may contain one kind of the pyrrolidone derivative alone, or may contain two or more kinds thereof.
The content of the pyrrolidone derivative is preferably 0.001% by mass to 2% by mass, more preferably 0.001% by mass to 1% by mass, based on the total mass of the fountain solution composition. It is particularly preferable that the content is 0.01% by mass to 1% by mass.

<Acetylene glycols, acetylene alcohols, and alkylene oxide adducts thereof>
The fountain solution composition for lithographic printing according to the present disclosure may contain at least one compound selected from the group consisting of acetylene glycols, acetylene alcohols, and alkylene oxide adducts thereof. Preferable examples of the alkylene oxide include ethylene oxide and propylene oxide.
Specific examples of these compounds include 3,5-dimethyl-1-hexyne-3-ol, 2,5-dimethyl-3-hexyne-2,5-diol and 2,4,7,9-tetramethyl-5. -Decyne-4,7-diol, 3,6-dimethyl-4-octyne-3,6-diol, 2-butyne-1,4-diol, 3-methyl-1-butyn-3-ol, and them And ethylene oxide and/or propylene oxide adducts thereof. Among them, 3,6-dimethyl-4-octyne-3,6-diol, 2,4,7,9-tetramethyl-5-decyne-4,7-diol, or 2,4,7,9-tetra Preferred is a compound in which 4 to 10 ethylene oxides are added to methyl-5-decyne-4,7-diol.

The fountain solution composition according to the present disclosure may contain acetylene glycols, acetylene alcohols, and their alkylene oxide adducts alone or in combination of two or more.
The content of acetylene glycols, acetylene alcohols, and alkylene oxide adducts thereof is preferably 0.0001 mass% to 5 mass% with respect to the total mass of the fountain solution composition. It is more preferably from 2% by mass to 2% by mass.

<Sugar>
The fountain solution composition for lithographic printing according to the present disclosure preferably contains a saccharide from the viewpoint of stain resistance of the non-image area.
The saccharide can be selected from monosaccharides, disaccharides, oligosaccharides and the like, and also includes sugar alcohols obtained by hydrogenation. Specific examples include D-erythrose, D-threose, D-arabinose, D-ribose, D-xylose, D-erythro-pentulose, D-allulose, D-galactose, D-glucose, D-mannose, D-talose. , Β-D-fructose, α-L-sorbose, 6-deoxy-D-glucose, D-glycero-D-galactose, α-D-allo-heptulose, β-D-altro-3-heptulose, saccharose, lactose. , D-maltose, isomaltose, inulobiose, hyalbiouron, maltotriose, D,L-arabit, revit, xylit, D,L-sorbit, D,L-mannite, D,L-idit, D,L-talit , Dulcit, alodulcit, maltitol, reduced starch syrup and the like. These saccharides may be used alone or in combination of two or more.

The fountain solution composition according to the present disclosure may contain one type of saccharide alone or two or more types.
The content of saccharides is preferably 0.01% by mass to 2% by mass, more preferably 0.05% by mass to 1% by mass, based on the total mass of the fountain solution composition.

<Preservative>
The fountain solution composition for lithographic printing according to the present disclosure preferably contains a preservative from the viewpoint of storage stability.
Specific examples of preservatives include benzoic acid and its derivatives, phenol or its derivatives, formalin, imidazole derivatives, sodium dehydroacetate, 4-isothiazolin-3-one derivatives, benztriazole derivatives, amidine or guanidine derivatives, and quaternary ammonium. Salts, pyridine, quinoline or guanidine derivatives, diazine or triazole derivatives, oxazole or oxazine derivatives, halogenonitropropane compounds, bromonitroalcohol-based bromonitropropanols, 1,1-dibromo-1-nitro-2-ethanol, 3-Bromo-3-nitropentane-2,4-diol and the like can be mentioned.

The fountain solution composition according to the present disclosure may contain one kind of preservative alone or may contain two or more kinds of preservatives.
Although the content of the preservative varies depending on the types of bacteria, mold, and yeast, it is preferably 0.0001 mass% to 1 mass% with respect to the total mass of the fountain solution composition.

<Other additives>
The fountain solution composition for lithographic printing according to the present disclosure may contain other additives than those described above.
Other additives are not particularly limited, and known additives can be used, and examples thereof include a colorant, a rust preventive, an antifoaming agent, a fragrance, and a masking agent.
As the colorant, a food dye or the like can be preferably used. For example, as the yellow pigment, CI No. 19140, 15985, CI No. 16185, 45430, 16255, 45380, 45100, and CI No. 42640, CI No. 42090, 73015, CI No. 42095 etc. are mentioned.
Examples of the rust preventive agent include benzotriazole, 5-methylbenzotriazole, thiosalicylic acid, benzimidazole and derivatives thereof.
Preferred examples of the defoaming agent include silicone defoaming agents. As the silicone defoaming agent, both an emulsion dispersion type and a solubilizing type can be used. Further, a non-silicone type defoaming agent can be used in combination or alone.

The fountain solution composition for lithographic printing according to the present disclosure further comprises a corrosion inhibitor such as magnesium nitrate, zinc nitrate, calcium nitrate, sodium nitrate, potassium nitrate, lithium nitrate, ammonium nitrate, a hard film such as a chromium compound and an aluminum compound. Agent, cyclic ether: an organic solvent such as 4-butyrolactone, a water-soluble surface-active organometallic compound described in JP-A-61-193893, and the like may be contained.

The content of each of these other additives is preferably 0.0001% by mass to 1% by mass based on the total mass of the fountain solution composition.

<pH of dampening water>
The pH of the dampening water (diluting composition) when the dampening water composition according to the present disclosure is used as it is or after being diluted and used as dampening water has a dampening water stain inhibitory property and ink inking. From the viewpoint of sex, it is preferably from 2 to 10, particularly preferably from 3 to 9.
As the pH of the dampening water in the present disclosure, a value measured at 25° C. using HM-30R manufactured by Toa DKK Co., Ltd. is adopted.

(Lithographic printing plate manufacturing method and lithographic printing method)
The method for producing a lithographic printing plate according to the present disclosure, in addition to using at least a diluted composition obtained by diluting the lithographic printing fountain solution composition according to the present disclosure or the lithographic printing fountain solution composition according to the present disclosure, in particular, There is no limitation and it may be on-press development or developer development, but on-press development is preferable.
Among them, the method for producing a lithographic printing plate according to the present disclosure includes a step of exposing a lithographic printing plate precursor imagewise to form exposed portions and unexposed portions (also referred to as “exposure step”), and a book. A step of supplying a fountain solution for lithographic printing according to the disclosure or a diluted composition obtained by diluting the fountain solution for lithographic printing according to the present disclosure and performing on-press development to obtain a lithographic printing plate ("on-press development step" It is also referred to as ".".
The lithographic printing method according to the present disclosure is not particularly limited, except that at least the lithographic printing fountain solution composition according to the present disclosure or the diluted composition obtained by diluting the lithographic printing fountain solution composition according to the present disclosure is used. On-press development or developer development may be used, but on-press development is preferred.
Among them, the lithographic printing method according to the present disclosure includes a step of imagewise exposing a lithographic printing plate precursor to form an exposed portion and an unexposed portion, a fountain solution composition for lithographic printing according to the present disclosure, or the present disclosure. A step of supplying a diluted composition obtained by diluting a fountain solution for lithographic printing according to to obtain an on-press development lithographic printing plate, and the planographic printing plate, and the fountain solution composition for lithographic printing or the above. It is preferable to include a step of printing using the diluted composition and a printing ink (also referred to as “printing step”).
Further, the lithographic printing method according to the present disclosure provides a fountain solution composition for lithographic printing according to the present disclosure in at least one of the step of performing on-press development to obtain a lithographic printing plate or the step of printing. It is preferable to use the product or a diluted composition obtained by diluting the same, and as described above, it is more preferable to use the fountain solution composition for lithographic printing disclosed in both steps or the diluted composition obtained by diluting the same.

The fountain solution composition according to the present disclosure can be used for various lithographic printing plate precursors, but in particular, an aluminum plate is used as a support, and a photosensitive lithographic printing plate precursor having a photosensitive layer thereon (previously A lithographic printing plate obtained by subjecting a printing plate to which photosensitivity is given to image exposure to a PS plate) and then dissolving and removing an unnecessary image recording layer with a suitable developing solution (development processing step), and When printing is performed by supplying dampening water, printing ink, or both without going through the development processing step after image exposure, the unnecessary image recording layer is removed by the dampening water, printing ink, or both It can be suitably used for a development type lithographic printing plate precursor.
Preferred such PS plates are, for example, a mixture of a diazo resin (a salt of a condensate of p-diazodiphenylamine and paraformaldehyde) and shellac as described in British Patent 1,350,521. A photosensitive layer formed on an aluminum plate, a diazo resin and a hydroxyethyl methacrylate unit as described in British Patent Nos. 1,460,978 and 1,505,739, or A light-sensitive layer comprising a mixture with a polymer having a hydroxyethyl acrylate unit as a main repeating unit provided on an aluminum plate, and dimethylmaleimide groups described in JP-A-2-236552 and 4-2744429. Negative PS plate such as one having a photosensitive polymer system containing an aluminium plate, and an O-quinone diad photosensitive material and a novolac type phenolic resin as described in JP-A No. 50-125806. A positive PS plate having a photosensitive layer made of a mixture of the above on an aluminum plate is included. It can also be used for a positive PS plate that has been subjected to a burning treatment.

An alkali-soluble resin other than the above-mentioned alkali-soluble novolac resin can be added to the composition forming the photosensitive layer (image recording layer), if necessary. Examples thereof include a styrene-acrylic acid copolymer, a methylmethacrylate-methacrylic acid copolymer, an alkali-soluble polyurethane resin, an alkali-soluble vinyl resin and an alkali-soluble polybutyral resin described in JP-B-52-28401. it can. Further, a PS plate provided with a photosensitive layer of a photopolymerizable photopolymer composition as described in US Pat. Nos. 4,072,528 and 4,072,527 on an aluminum plate, PS plate in which a photosensitive layer made of a mixture of azide and a water-soluble polymer as described in British Patent Nos. 1,235,281 and 1,495,861 is provided on an aluminum plate. Is also preferable.
Further, it can be suitably used for a CTP plate which is directly exposed by a visible or infrared laser. As a specific example, a photopolymer type digital plate (for example, PN-V2 manufactured by FUJIFILM Corporation), a thermal positive type digital plate (for example, XP-F manufactured by FUJIFILM Corporation), and a thermal negative type digital plate (for example, , HN-NV manufactured by Fuji Film Co., Ltd., and the like.

Furthermore, the fountain solution composition according to the present disclosure can be particularly preferably used for an on-press development type lithographic printing plate precursor. Examples of such an on-press development type unprocessed lithographic printing plate precursor include those described in International Publication No. 17/168831.
As the lithographic printing plate precursor for on-press development, for example, on an aluminum support, an intermediate layer containing a compound having a support adsorptive group and a hydrophilic group, an infrared absorber, a polymerization initiator, a polymerizable compound, And an image recording layer containing polymer particles comprising a styrene copolymer, wherein the aluminum support is an aluminum plate having an anodized film on the surface in contact with the intermediate layer, and in the anodized film. Particularly preferred are those having micropores extending in the depth direction from the surface in contact with the intermediate layer.
In the on-press development method, the image-exposed lithographic printing plate precursor is supplied with dampening water, printing ink or both on the printing machine, and the image recording layer in the non-image area is removed to prepare a lithographic printing plate. To be done. That is, the lithographic printing plate precursor is image-exposed and then mounted on a printing machine as it is without any development treatment. Next, when dampening water, printing ink or both are supplied for printing, the uncured image is supplied by the supplied dampening water, printing ink or both in the non-image area at an early stage during printing. The recording layer is dissolved or dispersed and removed, and the hydrophilic surface is exposed at that portion. On the other hand, in the exposed area, the image recording layer cured by exposure forms an ink receiving area having a lipophilic surface. In this way, the lithographic printing plate precursor is on-press developed on the printing machine and used as it is for printing a large number of sheets.
Further, during the on-press development, it is preferable to supply both the fountain solution and the printing ink to the plate surface of the lithographic printing plate.
As the printing ink, a normal printing ink for lithographic printing is preferably used. The printing ink is not particularly limited, and various known inks (oil-based ink, UV curable ink, newspaper ink, etc.) can be used as desired.
As the dampening water during on-machine development, it is preferable to use the dampening water composition for lithographic printing or the diluted composition thereof according to the present disclosure.
Further, as the dampening water at the time of printing, it is preferable to use the dampening water composition for lithographic printing or the diluted composition thereof according to the present disclosure.
Specific examples of the on-press development type lithographic printing plate precursor include a completely untreated CTP plate (for example, SUPERIA ZD manufactured by FUJIFILM Corporation) and a completely untreated CTP plate for newspaper (for example, SUPERIA ZN- manufactured by FUJIFILM Corporation). II) and the like.

Hereinafter, the exposure step and the on-press development step in the method for producing a lithographic printing plate will be described, but the exposure step in the method for producing a lithographic printing plate according to the present disclosure and the exposure step in the lithographic printing method according to the present disclosure are the same. These are the steps, and the on-press development step in the method for producing a lithographic printing plate according to the present disclosure and the on-press development step in the lithographic printing method according to the present disclosure are the same steps.

<Exposure process>
The method for producing a lithographic printing plate according to the present disclosure preferably includes a step (exposure step) of exposing the lithographic printing plate precursor imagewise to form exposed portions and unexposed portions.
Further, the lithographic printing method according to the present disclosure preferably includes a step (exposure step) of exposing the lithographic printing plate precursor imagewise to form exposed portions and unexposed portions.
It is preferable that the lithographic printing plate precursor in the above exposure step is imagewise exposed by laser exposure through a transparent original image having a line image, a halftone image or the like, or by laser beam scanning using digital data.
The wavelength of the light source is not particularly limited, and a wavelength according to the lithographic printing plate precursor used can be used, but 750 nm to 1,400 nm is preferably used. As the light source of 750 nm to 1,400 nm, solid-state lasers and semiconductor lasers that emit infrared rays are suitable. For the infrared laser, the output is preferably more than 100 mW, preferably, the exposure time per pixel is preferably within 20 microseconds, also that the amount of irradiation energy is 10mJ ^/ cm ² ~300mJ ^/ cm 2 preferable. Further, it is preferable to use a multi-beam laser device in order to shorten the exposure time. The exposure mechanism may be any of an inner drum system, an outer drum system, a flat bed system, and the like.
Image exposure can be performed by a conventional method using a platesetter or the like. In the case of on-press development, the planographic printing plate precursor may be mounted on the printing machine and then imagewise exposed on the printing machine.

As the laser for imagewise exposing the lithographic printing plate precursor, the wavelength of the light source is preferably 300 nm to 450 nm or 750 nm to 1,400 nm. In the case of a light source of 300 nm to 450 nm, a lithographic printing plate precursor containing a sensitizing dye having an absorption maximum in this wavelength region in the image recording layer is preferably used, and the light source of 750 nm to 1,400 nm is preferably the one described above. To be A semiconductor laser is suitable as a light source of 300 nm to 450 nm.

<On-machine development process>
The method for producing a lithographic printing plate according to the present disclosure includes on-press development by supplying a dampening water composition for lithographic printing according to the present disclosure or a diluted composition obtained by diluting the fountain solution for lithographic printing according to the present disclosure. It is preferable to include a step of obtaining a lithographic printing plate (on-press development step).
Further, the lithographic printing method according to the present disclosure, the lithographic printing fountain solution composition according to the present disclosure or a diluted composition obtained by diluting the lithographic printing fountain solution composition according to the present disclosure is developed on-press. It is preferable to include a step of obtaining a lithographic printing plate (on-press development step).
The on-press development method will be described below.

[On-machine development method]
In the on-press development method, the image-exposed lithographic printing plate precursor may be supplied with an ink and an aqueous component on the printing machine, and the image recording layer in the non-image area may be removed to prepare a lithographic printing plate. preferable.
That is, after image exposure of the lithographic printing plate precursor, it is mounted in the printing machine as it is without any development treatment, or after the lithographic printing plate precursor is mounted in the printing machine, image exposure is carried out on the printing machine, and then, , Dampening water, printing ink, or both are supplied, and printing is performed at an early stage during printing, in the non-image area, uncured by either or both of the supplied dampening water and printing ink. The image recording layer is dissolved or dispersed and removed, and the hydrophilic surface is exposed at that portion. On the other hand, in the exposed area, the image recording layer cured by exposure forms an ink receiving area having a lipophilic surface. Although dampening water or printing ink may be initially supplied to the plate surface, it is preferable that dampening water is first supplied from the viewpoint of promoting on-press development. In this way, the lithographic printing plate precursor is on-press developed on the printing machine and used as it is for printing a large number of sheets.
As the printing ink, a normal printing ink for lithographic printing is preferably used.
In the on-press development step, from the viewpoint of suppressing dampening water stains, a lithographic printing dampening water composition according to the present disclosure or a lithographic printing dampening water composition according to the present disclosure is diluted. It is preferable to use a composition, and it is more preferable to use a diluted composition obtained by diluting the fountain solution for lithographic printing, and the fountain solution for lithographic printing was diluted to 25 to 200 volume times. It is particularly preferred to use a diluted composition.
Moreover, it is preferable that the above-mentioned dilution is performed with water. Further, the above-mentioned dilution may be carried out, if necessary, together with water together with a lower alcohol such as isopropanol (alcohol compound having 1 to 4 carbon atoms).
The dilution ratio of the fountain solution composition for lithographic printing according to the present disclosure at the time of preparing the diluted composition used in the on-press development step is not particularly limited and may be appropriately selected as desired. It is preferably from 1 to 1000 times by volume, more preferably from 10 to 500 times by volume, and particularly preferably from 25 to 200 times by volume.
Further, the pH of the dampening water composition for lithographic printing or the diluting composition used in the on-press development step is preferably 2 to 10 from the viewpoint of suppressing dampening water stains, and 3 to 3. 9 is particularly preferable.

<Printing process>
A lithographic printing method according to the present disclosure includes a printing step in which printing ink is supplied to a lithographic printing plate to print a recording medium.
The printing ink is not particularly limited, and various known inks can be used as desired. Further, as the printing ink, oil-based ink, ultraviolet curable ink (UV ink) and ink for newspaper are preferably mentioned.
In the printing process, dampening water may be supplied if necessary.
Further, the printing process may be performed continuously with the on-press development process or the developing solution development process without stopping the printing press.
The recording medium is not particularly limited, and a known recording medium can be used as desired.
Further, in the above printing step, from the viewpoint of the dampening water stain suppressing property, and the ink receptivity, the planographic printing dampening water composition according to the present disclosure or the planographic printing dampening water composition according to the present disclosure. It is preferable to use a diluted composition obtained by diluting the product, more preferably a diluted composition obtained by diluting the fountain solution composition for lithographic printing, and the fountain solution composition for lithographic printing is used in an amount of 25 to 200 times by volume. It is particularly preferable to use a diluted composition that is diluted to one volume.
Moreover, it is preferable that the above-mentioned dilution is performed with water. Further, the above dilution may be carried out by using a lower alcohol such as isopropanol together with water, if necessary.
The dilution ratio of the fountain solution composition for lithographic printing according to the present disclosure at the time of preparing the diluted composition used in the printing step is not particularly limited and may be appropriately selected as desired, but is 5 volume times. ˜1,000 volume times is preferable, 10 volume times to 500 volume times is more preferable, and 25 volume times to 200 volume times is particularly preferable.
Further, the pH of the dampening water composition for lithographic printing or the dilution composition used in the printing step is 2 to 10 from the viewpoint of dampening water stain suppression property and ink receptivity. Is preferred, with 3 to 9 being particularly preferred.

In the method of preparing a lithographic printing plate according to the present disclosure, and in the lithographic printing method according to the present disclosure, if necessary, the entire surface of the lithographic printing plate precursor is heated before exposure, during exposure, and between exposure and development. You may. By such heating, the image forming reaction in the image recording layer is promoted, and advantages such as improvement in sensitivity and printing durability and stabilization of sensitivity may occur. The heating before development is preferably performed under mild conditions of 150° C. or lower. With the above aspect, it is possible to prevent problems such as the non-image portion being cured. It is preferable to use very strong conditions for heating after development, and it is preferable that the temperature is in the range of 100°C to 500°C. Within the above range, a sufficient image strengthening effect can be obtained, and problems such as deterioration of the support and thermal decomposition of the image area can be suppressed.

<Developer development process>
The lithographic printing method according to the present disclosure is a step of exposing a lithographic printing plate precursor imagewise to form an exposed portion and an unexposed portion, and removing the image recording layer in the non-image portion with a developer to form a lithographic printing plate. A step of producing (also referred to as a “developing solution developing step”), and the above lithographic printing plate and the fountain solution composition for lithographic printing according to the present disclosure or the fountain solution composition for lithographic printing according to the present disclosure are diluted. The method may include a step (printing step) of printing using the diluted composition and the printing ink.
Further, the lithographic printing method according to the present disclosure, a step of imagewise exposing the lithographic printing plate precursor according to the present disclosure, a step of removing the image recording layer of the non-image area with a developer to produce a lithographic printing plate, And a step of printing with the obtained lithographic printing plate.
As the developing solution, a known developing solution can be used.
The pH of the developer is not particularly limited and may be a strong alkaline developer, but a developer having a pH of 2 to 11 is preferable. Preferable examples of the developer having a pH of 2 to 11 include a developer containing at least one of a surfactant and a water-soluble polymer compound.
In the development process using a strong alkali developing solution, the protective layer is removed by the pre-water washing step, then the alkali development is performed, the alkali is washed off by the post-water washing step, the gum solution treatment is performed, and the drying step is performed. Is mentioned.
Further, when the above developer containing a surfactant or a water-soluble polymer compound is used, development-gum solution treatment can be carried out simultaneously. Therefore, the post-water washing step is not particularly required, and the development step and the gum solution treatment with one solution can be followed by the drying step. Further, since the protective layer can be removed simultaneously with the development and the gum solution treatment, the pre-water washing step is not particularly necessary. After the development processing, it is preferable to dry after removing the excess developing solution using a squeeze roller or the like.

Hereinafter, the present disclosure will be described in detail with reference to Examples, but the present disclosure is not limited thereto. In this example, "%" and "part" mean "mass%" and "part by mass", respectively, unless otherwise specified.
In addition, in the polymer compound, the molecular weight is the weight average molecular weight (Mw) and the ratio of the constitutional units is a molar percentage, except for those specified in particular. Moreover, the weight average molecular weight (Mw) is a value measured as a polyethylene glycol conversion value by the Gel Filtration Chromatography (GFC) method.
Furthermore, the unit of the acid value described below is meq/g.

(Examples 1 to 17 and Comparative Examples 1 to 5)
<Preparation of fountain solution composition for lithographic printing>
Various fountain solution compositions for lithographic printing used in Examples 1 to 14 and Comparative Examples 1 to 5 were prepared according to the compositions shown in Tables 1 to 3 below.
In Tables 1 to 3, the unit of the numerical value in each component column is gram, and water was added to the final volume of 1,000 mL.
All of these fountain solution compositions for lithographic printing are concentrated types and are diluted with water or the like at the time of use.

Details of each component shown in Tables 1 to 3 are shown below.

<Polymer Having Polyallylamine Structure or Polyallylamine Salt Structure>
PA-1: Allylamine polymer (PAA-03, manufactured by Nitto Bo Medical Co., Ltd., Mw=3,000)
PA-2: Allylamine hydrochloride polymer (PAA-HCL-05, manufactured by Nitto Bo Medical Co., Ltd., Mw=5,000)
PA-3: Methylcarbonylated allylamine acetate polymer (PAA-AC5050A, manufactured by Nitto Bo Medical Co., Ltd., Mw=15,000)
PA-4: Urea polyallylamine polymer (PAA-N5050CL, manufactured by Nitto Bo Medical Co., Ltd., Mw=15,000)
PA-5: Allylamine/dimethylallylamine copolymer (PAA-1112, manufactured by Nitto Bo Medical Co., Ltd., Mw=1,000)
PA-6: Methoxycarbonylated allylamine polymer (PAA-5000, manufactured by Nitto Bo Medical Co., Ltd., Mw=15,000)

<Polymer Having Polydiallylamine Structure or Polydiallylamine Salt Structure>
PA-7: diallylamine polymer (PAS-21, manufactured by Nitto Bo Medical Co., Ltd., Mw=5,000)
PA-8: diallylamine hydrochloride polymer (PAS-21CL, manufactured by Nitto Bo Medical Co., Ltd., Mw=50,000)
PA-9: Methyl diallylamine acetate polymer (PAS-M-1A, manufactured by Nitto Bo Medical Co., Ltd., Mw=20,000)
PA-10: diallyldimethylammonium chloride polymer (PAS-H-1L, manufactured by Nitto Bo Medical Co., Ltd., Mw=8,500)
PA-11: diallyldimethylammonium chloride/sulfur dioxide copolymer (PAS-A-5, manufactured by Nitto Bo Medical Co., Ltd., Mw=4,000)
PA-1210: diallyldimethylammonium chloride/acrylamide copolymer (PAS-J-81L, manufactured by Nitto Bo Medical Co., Ltd., Mw=10,000)
PA-13: Chlorohydroxypropylated diallylamine hydrochloride/diallyldimethylammonium chloride copolymer (PAS-880, manufactured by Nitto Bo Medical Co., Ltd., Mw=40,000)
PA-14: allylamine acetate/diallylamine acetate copolymer (PAA-D19A, manufactured by Nitto Bo Medical Co., Ltd., Mw=40,000)
PA-15: diallylmethylethylammoniumethylsulfate polymer (PAS-24, manufactured by Nitto Bo Medical Co., Ltd., Mw=37,000)

<Cationic polymer>
Polyethyleneimine: Nippon Shokubai Co., Ltd. Epomin SP-200, number average molecular weight Mn=10,000
Polyacrylamide: MT Aqua Polymer Co., Ltd. Akofloc N-100, Mw = 17 million Polyvinylamine: BASF Lupanmin 9095, Mw = 340,000

<Surfactant>
Pluronic L-31: Nonionic surfactant, manufactured by ADEKA Co., Ltd. Surfynol 440: Nonionic surfactant, manufactured by Nissin Chemical Industry Co., Ltd. Tetronic 305: Nonionic surfactant, manufactured by BASF.

<Water-soluble polymer compound>
Polyvinylpyrrolidone K-15: PVP K-15 manufactured by ISP
Hydroxypropyl cellulose HPC-LL: HPC-LL manufactured by Nippon Soda Co., Ltd.

<Other additives>
Anticorrosion agent (benzotriazole): BT-120, 1,2,3-benzotriazole manufactured by Johoku Chemical Industry Co., Ltd. Preservative (isothiazoline type): Biohop antifoaming agent (silicone type) manufactured by KI Kasei Co., Ltd.: Momentive Performance Materials Japan TSA-730

The fountain solution compositions for lithographic printing of Examples 1 to 14 and Comparative Examples 1 to 5 prepared as described above were each diluted to 3% by volume with pseudo hard water having a hardness of 400 ppm and used in the following. It was dampening water.

Further, in Example 15, the fountain solution composition for lithographic printing of Example 10 was mixed with 32 volume times of pseudo-hard water having a hardness of 400 ppm and diluted to 33 volume times to be described later in (a) to (a). The fountain solution was used in all the evaluation methods of f).
In Example 16, the fountain solution composition for lithographic printing of Example 10 was mixed with 99 volume times of pseudo-hard water having a hardness of 400 ppm and diluted to 100 volume times, and then (a) to (f) described later. The dampening water used in all the evaluation methods of 1.

The fountain solution composition for lithographic printing of Example 17 was prepared with the following composition.
Sakata Inks Co., Ltd. newspaper dampening solution SAH-7: 1% by mass
Isopropanol: 5 mass%
PA-11: 0.01 mass%
Water: residual

The fountain solution for lithographic printing prepared in Example 17 was diluted to 3% by volume with pseudo hard water having a hardness of 400 ppm to obtain a fountain solution to be used later.

<Evaluation method>
For the evaluation, the printer was a Heidelberg SX-74 equipped with an LED-UV light source after the printing cylinder, and the ink was a UV curable ink for LED-UV light source (T&K TOKA UV OFS-LED process). Ink) and lithographic printing plate precursors were completely untreated thermal CTP plate ZD-II (ZD-II version) manufactured by Fuji Film Co., Ltd. or completely untreated CTP plate ZN-II (ZN-II version) for newspapers. .. The dampening water tank of the printing machine has a volume of 40 L and is equipped with a cooling device, and the dampening water is cooled to 15° C. before use. A dampening water filter (ECOLIKIREI 100 manufactured by Fuji Film Global Graphic Systems Co., Ltd.) for purifying dampening water was connected to the dampening water tank, and operated only when the clogging suppression property of the dampening water filter was evaluated. ..
The ZD-II plate or ZN-II plate is used after being exposed only to a printing machine. In the ZD-II plate and the ZN-II plate, so-called on-press development is performed on a printing machine, and a lithographic printing plate is completed and printing becomes possible. After the on-press development, printing can be performed without any change from a normal PS plate that has been developed. That is, in the on-press development, ink and dampening water are supplied to the plate surface within several tens of sheets from the start of printing, the image recording layer in the non-image areas is removed, and the hydrophilic non-image areas are exposed. Development is complete. The exposure was performed using a thermal laser setter Quantum manufactured by Creo Co., Ltd., and an image on an FM screen TAFFTA20 was printed. In printing, each of the following evaluations was performed using lightweight coated paper (Emine manufactured by Chuetsu Pulp Co., Ltd.).
In Examples 1 to 9 and Comparative Examples 1 to 5, the ZD-II plate and the UV curable ink were used for evaluation, and in Examples 10 to 14, both the ZD-II plate and the ZN-II plate were used. Evaluation was performed using UV curable ink. Furthermore, in Examples 15 and 16, the ZD-II plate and the oil-based sheet-fed ink were used for the evaluation, and in Example 17, the ZN-II plate and the ink for newspaper were used for the evaluation.

(A) On-press developability Completely untreated thermal CTP plate ZD-II or ZN-II was exposed and mounted on a printing machine. Printing was started in the same manner as for a normal developed PS plate. Ink and dampening water are supplied to the plate surface, the image recording layer in the non-image area is removed, the hydrophilic non-image area is exposed, and the number of prints (image development number) until the image appears The on-press developability was evaluated.
A: The number of on-machine development sheets is 10 or less B: The number of on-machine development sheets is 11 to 20 C: The number of on-machine development sheets is 21 to 30 D: The number of on-machine development sheets is 31 or more

(B) Ink ink receptivity Completely untreated thermal CTP plates ZD-II and ZN-II were exposed and mounted on a printing machine. Printing was started in the same manner as for a normal developed PS plate. The ink receptivity was evaluated by the number of prints until an image appeared by the on-press development and the ink was evenly adhered.
A: The number of printed sheets is 20 or less B: The number of printed sheets is 21 to 30 C: The number of printed sheets is 31 to 50 D: The number of printed sheets is 51 or more

(C) Continuous printing stability The amount of dampening water (minimum amount of water) that does not cause stains and water loss (printing failure due to ink emulsification) is determined, and continuous printing is performed with the minimum amount of water level. Was carried out. Continuous printing stability was evaluated by the number of printed sheets until stains or water loss occurred on the printed matter and good printed matter was not obtained.
A: The number of printed sheets is 10,000 or more B: The number of printed sheets is 3,000 or more and 9,999 or less C: The number of printed sheets is 1 or more and 2,999 or less

(D) Suppression of dampening water stains Printing was performed without using a dampening water filter (ECOLIKIREI 100). 250 sheets were printed per plate, and 100 plates were printed.
After the printing was completed, the dampening water in the dampening water tank was collected, and the transparency was measured by the fluorometer described in JIS K0102 to evaluate the suppression of dampening water stains.
A: The transparency is 30 cm or more B: The transparency is 20 cm or more and less than 30 cm C: The transparency is 10 cm or more and less than 20 cm D: The transparency is less than 10 cm

(E) Preventing clogging of dampening water filter Printing was performed using a dampening water filter (ECOLIKIREI 100). 250 sheets were printed per plate, and 100 plates were printed.
The ECOLIKIREI 100 can display the pressure applied by the filter, and the pressure value rises when it becomes clogged.
The difference between the pressure value after printing and the pressure value at the start of printing was used to evaluate the clogging suppression property of the dampening water filter.
A: The difference is 10 kPa or less B: The difference is more than 10 kPa and 20 kPa or less C: The difference is more than 20 kPa and 30 kPa or less D: The difference is more than 30 kPa

(F) pH of dampening water
The obtained dampening water composition for lithographic printing was mixed with 49 volume times of pseudo-hard water having a hardness of 400 ppm and diluted to 50 volume times, and the pH of the obtained dampening solution was measured. The results are shown in Tables 4 to 7. HM-30R manufactured by Toa DKK Co., Ltd. was used as a pH meter, and the pH was measured at 25°C.
The pH was measured using a 33-fold dilution in Example 15 and a 100-fold dilution in Example 16.

The evaluation results are shown in Tables 4 to 7.

From the results shown in Tables 4 to 7 above, the fountain solutions of Examples 1 to 17, which are diluted compositions obtained by diluting the fountain solution composition for lithographic printing according to the present disclosure, were the fountain solutions of Comparative Examples 1 to 5. It can be seen that compared with water, in the printing using the on-press development type lithographic printing plate, the ability to suppress dampening water stains is excellent, and the lithographic printing plate obtained has excellent ink receptivity.
Further, the fountain solutions of Examples 1 to 17, which are diluted compositions obtained by diluting the fountain solution compositions for lithographic printing according to the present disclosure, have on-press developability, continuous printing stability, and fountain solution filters. It can be seen that the anti-clogging property is excellent.
Furthermore, the fountain solutions of Examples 1 to 16, which are diluted compositions obtained by diluting the fountain solution for lithographic printing according to the present disclosure, are good without using a highly volatile solvent component such as isopropyl alcohol. It is suitable for the environment because it shows excellent printability and can reduce the amount of organic solvent used. In Example 17, a commercially available dampening water for newspapers, SAH-7, was diluted to 1% by mass, PA-11 was dissolved by 0.01% by mass, and 5% by mass of isopropanol was added to use a newspaper ink. It was found that the on-press developability, the continuous printing stability, and the dampening water filter clogging suppression property were all excellent.
In addition, good printability can be obtained without using a compound such as nitrate which is estimated to have a large environmental load, such as the fountain solution of Example 4 or 7 to 13.

Claims (14)

A fountain solution composition for lithographic printing containing a polymer having at least one structure selected from the group consisting of a polyallylamine structure, a polyallylamine salt structure, a polydiallylamine structure, and a polydiallylamine salt structure. The fountain solution composition for lithographic printing according to claim 1, wherein the polymer contains a polymer having a polyallylamine structure and at least one structure selected from the group consisting of polyallylamine salt structures. The polymer has, as the polyallylamine structure or polyallylamine salt structure, at least one selected from the group consisting of structural units represented by the following formula (1) and structural units represented by the following formula (2). The fountain solution composition for lithographic printing according to claim 2, comprising a polymer having the structural unit of.

In formulas (1) and (2), R _{1 to} R ₅ each independently represent a hydrogen atom, an alkyl group, an alkylcarbonyl group, an alkoxycarbonyl group, or an aminocarbonyl group, and X ₁ ⁻ is a counter anion. Represents. The wet polymer for lithographic printing according to any one of claims 1 to 3, wherein the polymer includes a polymer having a polydiallylamine structure and at least one structure selected from the group consisting of polydiallylamine salt structures. Shimizu composition. The polymer has at least one selected from the group consisting of structural units represented by the following formula (3) and structural units represented by the following formula (4) as the polydiallylamine structure or polydiallylamine salt structure. The fountain solution composition for lithographic printing according to claim 4, which comprises a polymer having the constituent unit of.

In formulas (3) and (4), R _{6 to} R ₈ each independently represent a hydrogen atom, an alkyl group, a hydroxypropyl group, or a chlorohydroxypropyl group, and X ₂ ⁻ represents a counter anion. The fountain solution composition for lithographic printing according to claim 5, wherein the polymer comprises a polymer having a constitutional unit represented by the formula (4) as the polydiallylamine salt structure. R ₇ in the above formula (4) is an alkyl group having 1 to 3 carbon atoms, a hydroxypropyl group, or a chlorohydroxypropyl group, and R ₈ is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. A dampening water composition for lithographic printing according to claim 6.
The fountain solution composition for lithographic printing according to claim 6. The fountain solution for lithographic printing according to claim 1, wherein the content of the polymer is 0.001% by mass to 2% by mass based on the total mass of the fountain solution composition. Composition. A step of exposing the planographic printing plate precursor imagewise to form an exposed portion and an unexposed portion, and
A lithographic printing plate which is developed on-press by supplying the fountain solution composition for lithographic printing according to any one of claims 1 to 8 or a diluted composition obtained by diluting the fountain solution composition for lithographic printing. A method for producing a lithographic printing plate, which comprises the step of obtaining The method for producing a lithographic printing plate according to claim 9, wherein in the step of performing the on-press development to obtain a lithographic printing plate, a diluted composition obtained by diluting the fountain solution for lithographic printing in a volume of 25 to 200 volumes is used. .. The lithographic printing plate according to claim 9 or 10, wherein the fountain solution composition for lithographic printing or the diluted composition used in the step of performing the on-press development to obtain a lithographic printing plate has a pH of 3 to 9. Manufacturing method. A step of exposing the lithographic printing plate precursor imagewise to form an exposed portion and an unexposed portion,
A lithographic printing plate which is developed on-press by supplying the fountain solution composition for lithographic printing according to any one of claims 1 to 8 or a diluted composition obtained by diluting the fountain solution composition for lithographic printing. To obtain, and
A lithographic printing method comprising a step of printing using the lithographic printing plate, the fountain solution composition for lithographic printing or the diluent composition, and a printing ink. The lithographic printing method according to claim 12, wherein a diluting composition obtained by diluting the fountain solution composition for lithographic printing in a volume of 25 to 200 volumes is used in the step of printing. The lithographic printing method according to claim 12 or 13, wherein the fountain solution composition for lithographic printing or the diluted composition used in the step of printing has a pH of 3 to 9.