JP2009078438A - Dampening water composition for lithographic printing and heat set-off wheel printing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means for improving blanket piling especially a means for improving blanket piling in the view point of a dampening water composition. <P>SOLUTION: The dampening water composition is characterized by containing at least one kind of triol acyclic hydrocarbon compound with a total number of carbons of 6 to 10 and three OH groups and in which two OH groups of the three OH groups are bound to the carbon atoms at the first and second positions respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fountain solution composition for lithographic printing, and more specifically to a fountain solution composition for lithographic printing that is preferably used in an offset printing method, particularly in a heat-set-off wheel printing method.

Lithographic printing is a printing method that skillfully uses the property that water and oil do not essentially mix, and the printing plate surface consists of an area that receives water and repels oil-based ink, and an area that repels water and receives oil-based ink. The former is a non-image area, and the latter is an image area. The non-image area is moistened with the fountain solution to increase the interfacial chemical difference between the image area and the non-image area, thereby increasing the ink repellency of the non-image area and the ink receptivity of the image area. Made.
A lithographic printing machine is usually an offset printing system, and ink and fountain solution are supplied onto the plate, ink is deposited on the image area, and fountain solution is deposited on the non-image area. The image on the plate is printed by transferring to a blanket and then transferring from the blanket to paper. At this time, when continuous printing is performed for a long time, a problem of so-called “blanket piling” occurs in which the ink component and the paper component are gradually deposited on the non-image portion on the blanket. In particular, lithographic offset rotary printing (off-wheel printing) is characterized by being capable of continuous operation for a long period of time and high productivity. However, this blanket piling is likely to occur.

Blanket piling is easy to deposit as the ink in the image area is pushed out especially on the back side of the rotation (the end of the grip), and the deposit inhibits the ink transfer from the blanket to the paper, causing the ink to deposit poorly. It becomes. In order to remove the deposits, printing must be stopped and the blanket must be cleaned. The increase in waste paper and the reduction in productivity are extremely large, and improvements have been desired.
As a technique for improving blanket piling, for example, a lithographic offset rotary printing ink composition containing 1 to 5% by mass of lanolin having an acid value of less than 1.0 has been proposed (see Patent Document 1), and specific adhesion There has been proposed a pigment-coated paper for offset printing, which is obtained by coating a coating liquid composition that defines the ratio of the agent and the pigment (see Patent Document 2).
However, for the desire to print on a wide variety of inks and papers, the constraint that specific inks or papers must be used is not satisfactory, and improvement of blanket piling has still been a major problem.

  Conventionally known fountain solutions include alkali metal salts or ammonium salts of dichromic acid, phosphoric acid or salts thereof such as colloidal substances such as ammonium salts, gum arabic, and carboxymethyl cellulose (CMC). There is an aqueous solution added. However, the fountain solution containing only these compounds has the disadvantage that it is difficult to uniformly wet the non-image area of the plate, so that the printed matter sometimes gets soiled, and considerable skill is required to adjust the supply amount of the fountain solution. It has become a problem such as requiring.

  In order to remedy this drawback, a Dahlglen system has been proposed in which an aqueous solution containing about 20 to 25% of isopropyl alcohol is used as a fountain solution. According to this method, the wetness to the non-image area is improved, the amount of dampening water is small, the balance between the supply amount of printing ink and water is easy to adjust, and the dampening water into the printing ink There are a number of advantages in terms of workability and accuracy of the obtained printed matter, such as a reduced emulsification amount and improved transferability of printing ink to the blanket. However, since this isopropyl alcohol is easy to evaporate, a special device for keeping the isopropyl alcohol concentration of the dampening solution constant is necessary, which is expensive in terms of price. In addition, isopropyl alcohol has a peculiar unpleasant odor and has problems in toxicity, which is not preferable in the working environment. In addition, even if this dampening water to which isopropyl alcohol is added is applied to offset printing using a normal water rod, isopropyl alcohol evaporates on the roller and the plate surface, so that the effect cannot be exhibited. It was.

  As dampening water not containing isopropyl alcohol, for example, dampening water containing a specific propylene glycol-based compound (see Patent Document 3) or dampening water containing a compound obtained by adding ethylene oxide and propylene oxide to ethylenediamine ( Patent Documents 4 and 5) and a fountain solution containing a compound obtained by adding ethylene oxide and propylene oxide to diethylenetriamine (see Patent Document 6) have been proposed. However, all of these still tend to cause blanket piling, and improvement has been desired.

Moreover, the example which mix | blends compounds, such as glycerin and diglycerin, is known about using a triol compound as a fountain solution composition (refer patent documents 7-14). In addition, compounds such as trimethylolethane, trimethylolpropane, and 3-methylpentane 1.3.5-triol are shown as components of the fountain solution composition (see Patent Documents 15 to 18).
However, in the above-described prior art, there is no specific proposal for means for improving blanket piling.

JP 2006-328299 A JP 2006-322114 A JP 2001-138655 A JP 2007-50665 A JP 2007-168124 A JP 2007-55182 A JP-A-5-92677 Japanese Patent Laid-Open No. 5-221180 JP 2001-232926 A Japanese Patent Laid-Open No. 10-181234 JP 2005-246918 A JP-A-6-191175 JP 2006-321089 A JP 2004-322406 A Japanese Patent Laid-Open No. 10-181234 Japanese Patent Laid-Open No. 5-221179 JP 2006-321089 A JP 2004-322406 A

  The object of the present invention is to provide means for improving blanket piling, and in particular to provide means for improving blanket piling from the standpoint of a fountain solution composition.

As a result of intensive studies to achieve the above-mentioned problems, the present inventors have found that when a specific triol compound is added to the fountain solution, the blanket piling is remarkably improved.
Therefore, the present invention is a triol acyclic hydrocarbon compound having 3 OH groups and a total carbon number of 6 to 10, wherein two of the three OH groups are each in the 1-position and A fountain solution for lithographic printing, comprising at least one triol acyclic hydrocarbon compound bonded to a carbon atom at the 2-position.
As an embodiment of the present invention, there is an embodiment in which the triol compound is selected from 1,2,6-hexanetriol, 1,2,8-octanetriol, and 1,2,10-decanetriol.

As another embodiment of the fountain solution for lithographic printing of the present invention, at least one compound represented by the following general formula (I) and at least one compound represented by the following general formula (II): There exists the said fountain solution for lithographic printing containing 1 type.
R ¹ —O— (CH ₂ CHR ² O) _m —H (I)
(In the formula, R ¹ represents an alkyl group having 1 to 4 carbon atoms, R ² represents a hydrogen atom or a methyl group, and m represents an integer of 1 to 3).
HO— (CH ₂ CH (CH ₃ ) O) _n —H (II)
(In the formula, n represents an integer of 1 to 5.)

As another embodiment of the fountain solution composition for lithographic printing of the present invention, at least one selected from a compound obtained by adding ethylene oxide and propylene oxide to ethylenediamine, and a compound obtained by adding ethylene oxide and propylene oxide to diethylenetriamine There is a fountain solution for lithographic printing containing the above compound.
The fountain solution for lithographic printing according to the present invention can be preferably used in a heat-set off-wheel printing system. Therefore, the present invention further includes a heat-set type off-wheel ink, and the fountain solution composition. Is directed to a heat-set-off-wheel printing method using the

  According to the fountain solution composition of the present invention, the occurrence of blanket piling is suppressed, and good print quality can be stably obtained even if printing is continued for a long time. Furthermore, according to the fountain solution composition of the present invention, it is possible to easily adjust the supply amount of the fountain solution without using a volatile organic solvent such as isopropyl alcohol conventionally used in the fountain solution. In addition, it is preferable in terms of the working environment, and deterioration such as contamination of the water supply roller is not observed, and good printing performance can be obtained.

The present invention is described in detail below.
The triol compound used in the present invention has a total carbon number of 6 to 10, and two of the three OH groups are bonded to the first and second carbon atoms, respectively. It is a hydrocarbon compound.
Preferred examples of the triol compound used in the present invention include 1,2,6-hexanetriol, 1,2,8-octanetriol, and 1,2,10-decanetriol.
Here, in the case of a compound having a total carbon number of 5 or less, the intended effect of the present invention is hardly seen, while in the case of 12 or more, the dissolution is poor and the effect of the present invention is hardly seen. For compounds with 4 or more OH groups bonded, such as pentaerythritol, sorbitol, and mannitol, the target effect of the present invention is not observed, and the compound has a new hydrophobic balance and molecular structure in a very narrow range. Only the specific effect of the present invention was found.
In the fountain solution composition of the present invention, two or more of the triol compounds may be used in combination.
In the present invention, the addition amount of the triol compound is suitably 0.05 to 1.0% by mass with respect to the total amount of the fountain solution composition in use, and if it is within this range, the effect of the present invention is sufficient. In addition, it is suitable because it does not cause poor dissolution or water rod contamination. The added amount is more preferably 0.1 to 0.7% by mass, and still more preferably 0.2 to 0.5% by mass.

It is preferable that the fountain solution composition is used after diluting the concentrate appropriately during normal use from the viewpoint of transportation cost, storage space, production cost including packaging materials, and the like. The dilution ratio is preferably 10 to 200 times, more preferably 20 to 150, particularly preferably 30 to 100 times, and the concentration in the concentrate is set so as to be diluted to the concentration of the fountain solution composition at the time of use. To do. The higher the concentration rate, the better from the viewpoint of cost. However, if the concentration rate is too high, problems such as precipitation in the concentrated liquid and liquid separation are not preferable.
As a solubilizing agent for preparing a concentrate, it is preferable to use at least one compound of the following general formula (I) and at least one compound of the following general formula (II). The effect of synergistically increases.

Compounds of general formula (I) R ¹ —O— (CH ₂ CHR ² O) _m —H (I)
(In the formula, R ¹ represents an alkyl group having 1 to 4 carbon atoms, R ² represents a hydrogen atom or a methyl group, and m represents an integer of 1 to 3).
Specifically in the compound of the general formula (I), R ¹ represents a linear or branched alkyl group having 1 to 4 carbon atoms, specifically a methyl group, an ethyl group, a propyl group, There are an isopropyl group, an n-butyl group, an isobutyl group, and a t-butyl group, and an n-butyl group or a t-butyl group is particularly preferable from the viewpoint of enhancing the solubility of the triol compound and suppressing blanket piling. R ² represents a hydrogen atom or a methyl group, more preferably a methyl group, m represents an integer of 1 to 3, and 1 is particularly preferable.

Specific examples of the compound of the general formula (I) include ethylene glycol mono t-butyl ether, ethylene glycol mono n-butyl ether, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, tripropylene glycol monomethyl ether, propylene glycol monoethyl ether, diethylene glycol Propylene glycol monoethyl ether, tripropylene glycol monoethyl ether, tetrapropylene glycol monoethyl ether, propylene glycol monopropyl ether, dipropylene glycol monopropyl ether, tripropylene glycol monopropyl ether, propylene glycol monoisopropyl ether, dipropylene glycol mono Isopropyl ether, tripropylene glycol Isopropyl ether, propylene glycol mono n-butyl ether, dipropylene glycol monobutyl ether, tripropylene glycol monobutyl ether, propylene glycol monoisobutyl ether, dipropylene glycol monoisobutyl ether, tripropylene glycol monoisobutyl ether, propylene glycol monotertiary butyl ether, di And propylene glycol monotertiary butyl ether and tripropylene glycol monotertiary butyl ether.
These compounds can be used alone or in combination of two or more.

  Of these, n-butyl propylene glycol or t-butyl ether can be preferably used. The addition amount of the compound represented by the general formula (I) is suitably 0.05 to 5.0% by mass with respect to the total mass of the fountain solution composition at the time of use. This is suitable because it has a sufficient effect of suppressing the occurrence of the problem and does not cause problems such as poor printing durability of the roller strip or the printing plate. The addition amount is more preferably 0.1 to 3.0% by mass.

Compound of general formula (II) HO— (CH ₂ CH (CH ₃ ) O) _n —H (II)
(In the formula, n represents an integer of 1 to 5.)
In the compound of general formula (II), specifically, n is preferably 1 in the formula.
Accordingly, specific examples of the compound of the general formula (II) include propylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol and pentapropylene glycol. These compounds can be used alone or in combination of two or more. Among these, in order to increase the solubility of the triol compound, propylene glycol, dipropylene glycol and tripropylene glycol are preferable, and propylene glycol is most preferable.

  The content of the compound represented by the general formula (II) in the fountain solution composition is suitably 0.05 to 5.0% by mass with respect to the total mass of the fountain solution composition at the time of use. If it is within the range, the solubility of the triol compound is sufficient, the effect of suppressing blanket piling is sufficient, and the ink density is stable, so that the roller strip or the like hardly occurs. The content is more preferably 0.1 to 3.0% by mass.

The fountain solution composition of the present invention can further contain at least one compound selected from a compound obtained by adding ethylene oxide and propylene oxide to ethylenediamine and a compound obtained by adding ethylene oxide and propylene oxide to diethylenetriamine. .
These compounds are described below.
[Compound obtained by adding ethylene oxide and propylene oxide to ethylenediamine]
The compound obtained by adding ethylene oxide and propylene oxide to ethylenediamine used in the present invention has a weight average molecular weight of 500 to 20000, preferably 500 to 5000, more preferably 800 to 1500, and most suitable is weight. The average molecular weight is around 1000.

In the compound, the ratio of the number of added moles of ethylene oxide and propylene oxide is suitably in the range of 5:95 to 50:50, more preferably 20:80 to 35:65 from the viewpoint of obtaining sufficient printability. It is a range.
As the bond structure of ethylene oxide and propylene oxide, block structure in which ethylene oxide is added first and then propylene oxide is added, block structure in which propylene oxide is added first and then ethylene oxide is added, and simultaneously ethylene oxide and propylene There is a random structure to which oxide is added, but the same effect can be obtained with any structure.
The compound obtained by adding ethylene oxide and propylene oxide to ethylenediamine used in the present invention can be produced according to a conventional method. For example, ethylenediamine and / or propylene oxide are reacted with ethylenediamine in the presence of a catalyst.

（式中、Ａ及びＢはそれぞれ独立に−ＣＨ₂ＣＨ₂Ｏ−又は−ＣＨ₂ＣＨ（ＣＨ₃）Ｏ−を表し、Ａ及びＢは互いに異なる基であって、ａ〜ｈは各々０〜５０の整数を表し、但しａ、ｃ、ｅ及びｇのうち少なくとも一つは１以上であり、及びｂ、ｄ、ｆ及びｈのうち少なくとも一つは１以上である。ａ〜ｈは化合物全体の分子量が５００〜２００００となるような値である。なお、各共重合鎖はブロック構造でも、ランダム構造でもよい。）
該化合物の分子量やエチレンオキサイドとプロピレンオキサイドの比率は、例えば水酸基価及びアミン価の測定、ＮＭＲ測定などにより決定することができる。 A compound obtained by adding ethylene oxide and propylene oxide to ethylenediamine used in the present invention is specifically represented by the following formula (III).

(In the formula, A and B each independently represent —CH ₂ CH ₂ O— or —CH ₂ CH (CH ₃ ) O—, wherein A and B are groups different from each other; Represents an integer of 50, provided that at least one of a, c, e and g is 1 or more, and at least one of b, d, f and h is 1 or more, a to h are the whole compound The molecular weight of the copolymer is 500 to 20000. Each copolymer chain may have a block structure or a random structure.)
The molecular weight of the compound and the ratio of ethylene oxide to propylene oxide can be determined by, for example, measurement of hydroxyl value and amine value, NMR measurement, and the like.

（式中、ａ、ｂ、ｃ、ｄ、ｅ、ｆ、ｇ及びｈはそれぞれ、０〜５０の整数を表し、但しａ、ｃ、ｅ及びｇのうち少なくとも一つは１以上であり、及びｂ、ｄ、ｆ及びｈのうち少なくとも一つは１以上である。） Of the formula (III), it is more preferably represented by the following formula (IV).

(Wherein a, b, c, d, e, f, g and h each represents an integer of 0 to 50, provided that at least one of a, c, e and g is 1 or more, and (At least one of b, d, f, and h is 1 or more.)

The compound represented by the formula (IV) has an appropriate weight average molecular weight in the range of 500 to 20,000, preferably 500 to 5,000, and more preferably 800 to 1,500. a to h are values such that the molecular weight of the whole compound is 500 to 20000, but 1 to 10 are preferable, and 2 to 4 are particularly preferable.
Such a compound does not damage the image area even when water droplets left on the plate when the printing press is stopped evaporates by water and are concentrated and remain. The above compound can also replace isopropyl alcohol without being used in combination with a volatile organic solvent, but tends to worsen blanket piling and water rod contamination. By using together with the triol compound used in the present invention, it becomes possible to substitute isopropyl alcohol without deteriorating blanket piling and water rod contamination.
In the compound, the ratio of the number of added moles of ethylene oxide and propylene oxide is suitably in the range of 5:95 to 50:50, more preferably 20:80 to 35:65 from the viewpoint of obtaining sufficient printability. It is a range.

[Compound obtained by adding ethylene oxide and propylene oxide to diethylenetriamine]
The compound having ethylene oxide and propylene oxide added to diethylenetriamine used in the present invention has an appropriate weight average molecular weight in the range of 500 to 3,000, preferably 800 to 2,000, and most suitable is a weight average molecular weight of around 1000. Is.
The above-mentioned compound having such a molecular weight does not damage the image area even when water droplets remaining on the plate when the printing press is stopped are left by evaporation of water and concentration. The above compounds can also replace isopropyl alcohol without using in combination with a volatile organic solvent.

In the compound, the ratio of the number of added moles of ethylene oxide and propylene oxide is suitably in the range of 5:95 to 50:50, more preferably 20:80 to 35:65 from the viewpoint of obtaining sufficient printability. It is a range.
As the bond structure of ethylene oxide and propylene oxide, block structure in which ethylene oxide is added first and then propylene oxide is added, block structure in which propylene oxide is added first and then ethylene oxide is added, and simultaneously ethylene oxide and propylene There is a random structure to which oxide is added, but the same effect can be obtained with any structure.
The compound obtained by adding ethylene oxide and propylene oxide to diethylenetriamine used in the present invention can be produced according to a conventional method. For example, it can be produced by reacting diethylenetriamine with ethylene oxide and / or propylene oxide in the presence of a catalyst. Specifically, while cooling diethylenetriamine together with acetonitrile in an ice-water bath, propylene oxide was added dropwise to react therewith, and then ethylene oxide was further added dropwise to react, followed by filtration from this mixture and taking out the precipitate. From this, a propylene oxyad / ethylene oxide adduct of diethylenetriamine can be obtained.

（式中、Ａ及びＢはそれぞれ独立に−ＣＨ₂ＣＨ₂Ｏ−又は−ＣＨ₂ＣＨ（ＣＨ₃）Ｏ−を表し、Ａ及びＢは互いに異なる基であって、ａ〜ｊは各々１以上の整数を表す。各共重合鎖はブロック構造でも、ランダム構造でもよい。）
式中、ａ〜ｊは化合物全体の分子量が５００〜３０００となるような値であることが適当であり、１〜６が好ましく、２〜３が特に好ましい。
なお、該化合物の分子量やエチレンオキサイドとプロピレンオキサイドの比率は、例えば水酸基価及びアミン価の測定、ＮＭＲ測定などにより決定することができる。 A compound obtained by adding ethylene oxide and propylene oxide to diethylenetriamine used in the present invention is specifically represented by the following formula (V).

(In the formula, A and B each independently represent —CH ₂ CH ₂ O— or —CH ₂ CH (CH ₃ ) O—, wherein A and B are groups different from each other, and a to j are each 1 or more. (Each copolymer chain may be a block structure or a random structure.)
In the formula, a to j are suitably values such that the molecular weight of the whole compound is 500 to 3000, preferably 1 to 6, and particularly preferably 2 to 3.
The molecular weight of the compound and the ratio of ethylene oxide to propylene oxide can be determined by, for example, measurement of hydroxyl value and amine value, NMR measurement, or the like.

  By including 0.01 to 1% by mass, preferably 0.05 to 0.5% by mass of the above compound in the fountain solution composition, good printability is exhibited even if isopropyl alcohol is substituted. To do. Further, after the fountain solution is applied, even if the water droplets remaining on the plate at the time of printing stop are left to evaporate and become concentrated, the image area of the plate is not affected. However, the above compounds tend to worsen blanket piling and water stick dirt, and when used in combination with the triol compound used in the present invention, it is possible to replace isopropyl alcohol without worsening blanket piling and water stick dirt. It becomes.

As other components of the fountain solution composition of the present invention, the following can be included.
(a) Aid for improving wettability
(b) Water-soluble polymer compound
(c) pH adjuster
(d) chelating agent
(e) Odor masking agent
(f) Others ((i) preservatives, (ii) colorants, (iii) rust inhibitors, (iv) antifoaming agents, etc.)

  (a) A surfactant or other solvent can be used as an aid for improving wettability. Among the surfactants, for example, anionic surfactants include fatty acid salts, abietic acid salts, hydroxyalkane sulfonic acid salts, alkane sulfonic acid salts, dialkyl sulfosuccinic acid salts, linear alkyl benzene sulfonic acid salts, branched alkyl benzene sulfonic acid. Acid salts, alkylnaphthalene sulfonates, alkylphenoxy polyoxyethylenepropyl sulfonates, polyoxyethylene alkylsulfenyl ether salts, N-methyl-N-oleyl taurine sodium salts, N-alkylsulfosuccinic acid monoamide disodium salts, Petroleum sulfonates, sulfated castor oil, sulfated beef tallow oil, sulfate esters of fatty acid alkyl esters, alkyl sulfate esters, polyoxyethylene alkyl ether sulfate esters, fatty acids Noglyceride sulfates, polyoxyethylene alkylphenyl ether sulfates, polyoxyethylene styryl phenyl ether sulfates, alkyl phosphates, polyoxyethylene alkyl ether phosphates, polyoxyethylene alkylphenyl ether phosphates, styrene -Partially saponified products of maleic anhydride copolymer, partial saponified products of olefin-maleic anhydride copolymer, naphthalene sulfonate formalin condensate and the like. Among these, dialkyl sulfosuccinates, alkyl sulfates and alkyl naphthalene sulfonates are particularly preferably used.

  Nonionic surfactants include polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, polyoxyethylene polystyryl phenyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, glycerin fatty acid partial esters, sorbitan Fatty acid partial esters, pentaerythritol fatty acid partial esters, propylene glycol mono fatty acid esters, sucrose fatty acid partial esters, polyoxyethylene sorbitan fatty acid partial esters, polyoxyethylene sorbitol fatty acid partial esters, polyethylene glycol fatty acid esters, poly Glycerin fatty acid partial esters, polyoxyethylenated castor oil, polyoxyethylene glycerin fatty acid partial esters, fatty acid die Noruamido acids, N, N-bis-2-hydroxyalkylamines, polyoxyethylene alkylamines, triethanolamine fatty acid esters, and trialkylamine oxides. In addition, fluorine-based surfactants and silicon-based surfactants can also be used. Of these, polyoxyethylene alkylphenyl ethers, polyoxyethylene-polyoxypropylene block polymers and the like are preferably used. Furthermore, surfactants such as silicon derivatives or fluorine derivatives are also included. In the case of using a surfactant, the content thereof is 1.0% by mass or less, preferably 0.001 to 0.5% by mass in the fountain solution composition at the time of use in consideration of foaming. . Two or more kinds can be used in combination.

  In addition, as other auxiliaries or wetting solvents, 3-methoxy-3-methylbutanol, 3-methoxybutanol, ethylene glycol, diethylene glycol, triethylene glycol, butylene glycol, hexylene glycol, glycerin, diglycerin, polyglycerin, triglycerin Methylolpropane or the like can be used. These solvents may be used alone or in combination of two or more. In general, these solvents are suitably used in the range of 0.1 to 3% by mass, preferably 0.3 to 2% by mass, based on the total mass of the fountain solution composition in use.

  Examples of the water-soluble polymer compound (b) used in the fountain solution composition of the present invention include gum arabic, starch derivatives (eg, dextrin, enzymatically degraded dextrin, hydroxypropylated enzymatically degraded dextrin, carboxymethylated starch, phosphorus Acid starch, octenyl succinylated starch), alginate, fibrin derivatives (for example, carboxymethylcellulose, carboxyethylcellulose, methylcellulose) and other natural products and modified products thereof, polyethylene glycol and copolymers thereof, polyvinyl alcohol and derivatives thereof, polyvinylpyrrolidone Polyacrylamide and its copolymer, polyacrylic acid and its copolymer, vinyl methyl ether / maleic anhydride copolymer, vinyl acetate / maleic anhydride copolymer, polystyrene sulfonic acid and its copolymer Thing, and the like. The content of the water-soluble polymer compound is suitably 0.0001 to 0.1% by mass, more preferably 0.0005 to 0.05% by mass with respect to the fountain solution composition in use. .

In the present invention, among the above water-soluble polymer compounds, polyvinyl pyrrolidone can be particularly preferably used. The polyvinylpyrrolidone contained in the fountain solution composition means a homopolymer of vinylpyrrolidone. Polyvinylpyrrolidone having a molecular weight of 200 to 3,000,000 is appropriate, preferably having a molecular weight of 300 to 500,000, more preferably 300 to 100,000. Particularly preferred is 300 to 30,000.
These polyvinyl pyrrolidones can be used alone or in combination of two or more kinds having different molecular weights. Further, it can be combined with a low molecular weight polyvinyl pyrrolidone, for example, a vinyl pyrrolidone oligomer having a polymerization degree of 3 to 5.
As such polyvinyl pyrrolidone, a commercially available product can be used. For example, various great grades such as K-15, K-30, K-60, K-90, K-120 manufactured by ISP can be used.
0.001-0.3 mass% is suitable for content of polyvinylpyrrolidone in the fountain solution composition at the time of use, Preferably it is 0.005-0.2 mass%.

The fountain solution composition of the present invention preferably contains at least one selected from saccharides. The sugar to be used can be selected from monosaccharides, disaccharides, oligosaccharides, and the like, and includes sugar alcohols obtained by hydrogenation. Specific examples include D-erythrose, D-throse, 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-alto-3-heptulose, saccharose, lactose, D -Maltose, isomaltose, inulobiose, hyalbiouron, maltotriose, D, L-arabit, rebit, xylit, D, L-sorbit, D, L-mannit, D, L-digit, D, L-talit, zulcit , Allozulcit, maltitol, reduced water candy, etc. It is. These saccharides may be used alone or in combination of two or more.
In the fountain solution composition at the time of use, the content of at least one selected from saccharides is suitably 0.01 to 1% by mass, preferably 0.1 to 0.8% by mass.

  As the (c) pH adjusting agent used in the fountain solution composition of the present invention, a water-soluble organic acid and / or inorganic acid or a salt thereof can be used, and these compounds are used for adjusting the pH of the fountain solution or adjusting the pH. It is effective for buffering, moderate etching of the lithographic printing plate support or anticorrosion. Preferred organic acids include, for example, citric acid, ascorbic acid, malic acid, tartaric acid, lactic acid, acetic acid, gluconic acid, acetic acid, hydroxyacetic acid, succinic acid, malonic acid, levulinic acid, sulfanilic acid, p-toluenesulfonic acid, phytic acid, And organic phosphonic acid. Examples of the inorganic acid include phosphoric acid, nitric acid, sulfuric acid, and polyphosphoric acid. Further, alkali metal salts, alkaline earth metal salts or ammonium salts of these organic acids and / or inorganic acids, and organic amine salts are also preferably used. These organic acids, inorganic acids and / or salts thereof can be used alone. Or you may use as a mixture of 2 or more types. The addition amount of these pH adjusters to the fountain solution composition of the present invention is preferably in the range of 0.001 to 0.3% by mass, and in the acidic region where the pH value of the fountain solution composition is in the range of 3 to 7. Although it is preferable to use it, it can also be used in an alkaline region having a pH of 7 to 11 containing alkali metal hydroxide, phosphoric acid, alkali metal salt, alkali metal carbonate, silicate and the like.

  (D) a chelating agent can be further added to the fountain solution composition of the present invention. The fountain solution composition is usually prepared by diluting the concentrated solution by adding tap water or well water at the time of use. At this time, calcium ions contained in the diluted tap water or well water adversely affect printing. And may cause the printed material to become dirty easily. In such a case, the above disadvantages can be eliminated by adding a chelating agent. Preferred chelating agents include, for example, ethylenediaminetetraacetic acid, its potassium salt, its sodium salt; diethylenetriaminepentaacetic acid, its potassium salt, sodium salt; triethylenetetraminehexaacetic acid, its potassium salt, its sodium salt, hydroxyethylethylenediaminetriacetic acid Nitrilotriacetic acid, sodium salt; 1-hydroxyethane-1,1-diphosphonic acid, potassium salt, sodium salt; aminotri (methylenephosphonic acid), potassium salt, sodium salt And organic phosphonic acids and phosphonoalkanetricarboxylic acids. An organic amine salt is also effective in place of the sodium salt or potassium salt of the chelating agent. These chelating agents are selected so that they are stably present in the fountain solution composition at the time of use and do not impair the printability. As content of the chelate compound in the dampening water composition at the time of use, 0.001-0.5 mass% is suitable, Preferably it is 0.002-0.25 mass%.

(e) Odor masking agents include esters that are conventionally known for use as perfumes. For example, there is one represented by the following general formula (IV).
R ² -COOR ³ (IV)
In the compound of the general formula (IV), R ² is an alkyl group having 1 to 15 carbon atoms, an alkenyl group, an aralkyl group, or a phenyl group. In the case of an alkyl group or an alkenyl group, the number of carbon atoms is preferably 4-8. When R ² represents an alkyl group, an alkenyl group or an aralkyl group, they may be linear or branched. An alkenyl group having one double bond is particularly suitable. Examples of the aralkyl group include a benzyl group and a phenylethyl group. One or more hydrogen atoms of the alkyl group, alkenyl group, aralkyl group or phenyl group represented by R ² may be substituted with a hydroxyl group or an acetyl group. R ³ is an alkyl group having 3 to 10 carbon atoms, an aralkyl group or a phenyl group, which may be linear or branched. In the case of an alkyl group, the number of carbon atoms is preferably 3 to 9. Examples of the aralkyl group include a benzyl group and a phenylethyl group.

  Specific examples of (e) odor masking agents that can be used include formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, 2-ethylbutyric acid, valeric acid, isovaleric acid, 2-methylvaleric acid, hexanoic acid (caproic acid), 4-methylpentanoic acid (isohexanoic acid), 2-hexenoic acid, 4-pentenoic acid, heptanoic acid, 2-methylheptanoic acid, octanoic acid (caprylic acid), nonanoic acid, decanoic acid (capric acid), 2-decenoic acid , Esters of lauric acid or myristic acid. In addition, there are acetoacetate esters such as benzyl phenylacetate, ethyl acetoacetate and 2-hexyl acetoacetate. Among them, preferred are n-pentyl acetate, isopentyl acetate, n-butyl butyrate, n-pentyl butyrate and isopentyl butyrate, and n-butyl butyrate, n-pentyl butyrate and isopentyl butyrate are particularly preferable. The content of these acid esters in the fountain solution composition is suitably from 0.0001 to 10% by mass, more preferably from 0.001 to 1% by mass, based on the total mass of the fountain solution composition in use. %. By using these, the work environment can be further improved. Also. Vanillin, ethyl vanillin or the like may be used in combination.

  (F) (i) Preservative used in the fountain solution composition of the present invention includes phenol or a derivative thereof, formalin, imidazole derivative, sodium dehydroacetate, 4-isothiazolin-3-one derivative, benztriazole derivative, amidine Or derivatives of guanidine, quaternary ammonium salts, derivatives of pyridine, quinoline or guanidine, derivatives of diazine or triazole, derivatives of oxazole or oxazine, bromonitroalcohol-based bromonitropropanol, 2,2-dibromo-2-nitroethanol, Examples include 3-bromo-3-nitropentane and 2,4-diol. A preferable addition amount is an amount that exerts a stable effect on bacteria, fungi, yeast, etc., and varies depending on the type of bacteria, fungi, yeast, etc., but is 0. The range of 001 to 1.0% by mass is preferable, and it is preferable to use two or more preservatives that are effective against various molds, bacteria, and yeasts.

  As the colorant (f) (ii) used in the present invention, food colorants and the like can be preferably used. For example, CI No. 19140, 15985 as a yellow dye, CI No. 16185, 45430, 16255, 45380, 45100 as a red dye, CI No. 42640 as a purple dye, CI No. 42090, 73015 as a blue dye, CI No. 42095, and the like. Examples of the rust inhibitor (f) (iii) that can be used in the present invention include benzotriazole, 5-methylbenzotriazole, thiosalicylic acid, benzimidazole, and derivatives thereof. As the antifoaming agent (f) (iv) that can be used in the present invention, a silicon antifoaming agent is preferable, and any of an emulsifying dispersion type and a solubilizing type can be used.

  The balance is water as a component of the fountain solution composition of the present invention. The fountain solution composition is generally concentrated and commercialized when it is usually commercialized. Therefore, a concentrated solution can be obtained as an aqueous solution in which various components described above are dissolved using water, preferably demineralized water, that is, pure water. When such a concentrated solution is used, it is diluted about 10 to 200 times with tap water, well water, etc. during normal use to obtain a fountain solution composition during use.

  The fountain solution composition of the present invention can be used for various lithographic printing plates. In particular, a photosensitive lithographic printing plate having an aluminum plate as a support and a photosensitive layer thereon (previously photosensitive). The applied printing plate is called a PS plate) and can be suitably used for a lithographic printing plate obtained by image exposure and development. A preferable example of such PS plate is a photosensitive layer comprising a mixture of a diazo resin (a salt of a condensate of p-diazodiphenylamine and paraformaldehyde) and a shellac as described in British Patent 1,350,521. On the aluminum plate, polymers having diazo resin and hydroxyethyl methacrylate unit or hydroxyethyl acrylate unit as main repeating units as described in British Patent Nos. 1,460,978 and 1,505,739 And a photosensitive polymer system containing a dimethylmaleimide group described in JP-A-2-236552 and JP-A-4-274429 was provided on an aluminum plate. A negative PS plate such as the one disclosed in JP-A-50-125806 It includes positive PS plate provided on an aluminum plate and a photosensitive layer comprising a mixture of O- Kinonjiado photosensitive material and a novolac-type phenolic resins as described in. It can also be used for a positive PS plate that has been burned.

In the composition forming the photosensitive layer, an alkali-soluble resin other than the alkali-soluble novolak resin can be blended as necessary. For example, styrene-acrylic acid copolymer, methyl methacrylate-methacrylic acid copolymer, alkali-soluble polyurethane resin, alkali-soluble vinyl resin described in JP-B-52-28401, alkali-soluble polybutyral resin, and the like. it can. Further, a PS plate having 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, British Patent Nos. 1,235,281 and A PS plate having a photosensitive layer made of a mixture of an azide and a water-soluble polymer on an aluminum plate as described in each specification of No. 1,495,861 is also preferable.
Furthermore, it can be suitably used for a CTP plate that is directly exposed with a visible or infrared laser. Specific examples include a photopolymer type digital plate (for example, LP-NX manufactured by Fuji Photo Film Co., Ltd.), a thermal positive type digital plate (for example, LH-PI manufactured by Fuji Photo Film Co., Ltd.), and a thermal negative type digital plate (for example, Fuji Photo Film Co., Ltd. LH-NI).

Next, the present invention will be described more specifically with reference to examples. % Indicates mass% unless otherwise specified.
[Examples 1 to 3 and Comparative Examples 1 to 9]
Except for changing the polyhydric alcohol compound as shown in Table 1 below, using the same mass, various fountain solutions were prepared in the same manner as described below. In the formula, the unit is gram, and the amount added when water is finally added to adjust to 100 gram, which is the same as mass%.

Prescription component of fountain solution composition (use liquid) when used Addition amount propylene glycol mono-n-butyl ether 0.5 g
Propylene glycol 0.3g
0.3 g of the polyhydric alcohol compound of Table 1
Carboxymethylcellulose 0.01g
Ammonium nitrate 0.05g
0.01 g of citric acid
Isothiazolin-3-one 0.002 g
Benzotriazole 0.001g
Add water to make 100g

For each fountain solution composition, using a Lithron 26 printing machine manufactured by Komori Corporation, Toyo Ink Co., Ltd. ink: Super Leo Echo Black L, Oji Paper Co., Ltd. fine coated paper: OK The following evaluation was performed after printing 20000 sheets on a coat, FUJIFILM Corporation plate: PN-V.
(1) Blanket piling evaluation After printing, the blanket is removed, and the height of the deposit on the non-image area is measured with a stylus type surface roughness meter (surf coder). Evaluation was made relative to the fountain solution. A smaller value indicates a lower height of the pile.
(2) Decrease rate of halftone dot area In the 40% halftone dot area image area, the halftone dot area rate was measured with a reflection densitometer D19C manufactured by Gretag Macbeth Co., Ltd. at the start and at the end of printing 20000 sheets. The reduction rate of the dot area ratio at the end of printing relative to the start time was obtained.
Decrease rate = (dot area ratio at start-dot area ratio at the end of printing) / dot area ratio at start × 100
A smaller decrease rate indicates that printing performance can be stably obtained, which is preferable.
(3) Water supply roller stains After printing, the water supply roller stains were visually observed and ranked as follows.
○: Slightly dirty Δ: Slightly dirty ×: Clearly dirty The results are shown in Table 1.

Table 1

From the results in Table 1, it can be seen that when the triol compound is added according to the present invention, blanket piling is remarkably suppressed, and the decrease in the dot area ratio after printing is reduced. Further, the contamination of the water supply roller is not worsened.
In Examples 1 to 3, a 50 to 200 concentrated solution of the working solution was prepared, diluted with tap water to prepare and use the working solution, and it was confirmed that the same effects as described above were obtained.

[Examples 4 to 13]
In Example 2, the experiment was conducted in exactly the same manner except that propylene glycol mono-n-butyl ether and propylene glycol were replaced with the compounds shown in Table 2 below. In Example 13, isopropyl alcohol was used, and the amount added was increased to 15 times (ie 7.5%) the amount of compound used in the other examples (0.5%). In Example 13, if the amount of isopropyl alcohol added was not increased in this way, there was a tendency for ink to adhere to the non-image area on the printed matter and cause stains even if the water scale was increased. The results are shown in Table 2.

Table 2

In Table 2, the compounds of general formula (I) were used in Examples 2, 4 to 6, 9 to 12, and the compounds of general formula (II) were used in Examples 2, 4 to 10. is there. From these results, it can be seen that the effect of adding the triol compound is noticeable when the compound of general formula (I) and the compound of general formula (II) are used in combination.
Further, it was found that it was preferable to prepare a 50-fold concentrated solution of the working solution and use the compounds of the general formulas (I) and (II) from the viewpoint of dissolution stability.

[Experiment 1]
In Example 2, the same printing experiment was performed by changing only the addition amount of the triol compound. As a result, the addition amount was preferably 0.05% or more, more preferably 0.1% or more, and particularly preferably 0.2% or more. Moreover, when the addition amount exceeded 1%, there was a tendency for the water supply roller stain to deteriorate.
Furthermore, in Example 2, when the amount of 1,2,8-octanetriol added was 50% and 1,2,6-hexanetriol was added by 50%, the same effect was observed.

[Examples 14 to 16 and Comparative Examples 10 to 16]
In the following formulation of the fountain solution composition, various fountain solution compositions were prepared by varying the polyhydric alcohol compound as shown in Table 3.
Prescription component of fountain solution composition (working solution) at the time of use Amount added Compound of general formula (IV) 0.06 g
(A = c = e = g = 1, b = d = f = h = 3, molecular weight 977)
Polyvinylpyrrolidone 0.01g
Carboxymethylcellulose 0.05g
Polyhydric alcohol compound of Table 3 0.30 g
D-Sorbit 0.40g
Ammonium nitrate 0.02g
0.02 g of diammonium citrate
2,2-Dibromo-2-nitroethanol 0.002 g
Benzotriazole 0.002g
Add water to make 100g

Experiments were conducted in the same manner as in Example 1 using these fountain solution compositions. The results are shown in Table 3.
Table 3

[Experiment 2]
In Example 2, a printing experiment was performed in the same manner except that the ink used in the printing experiment was changed as follows, and the effect of the fountain solution composition of the present invention was confirmed.
Toyo Ink Co., Ltd. Super Leo Echo SOY Indigo, Red, Yellow レ オ Leo Echo SOY Ink, Indigo, Red, Yellow 〃 Leo Echo LTD Pro Ink, Indigo, Red, Yellow Tokyo Ink Co., Ltd. Web Actus SOY Major Ink, Indigo, Crimson, Yellow Dainippon Ink & Equipment Co., Ltd. New Advan Ink, Indigo, Crimson, Yellow The Inktec Co., Ltd. SOYBI VISTA Ink, Indigo, Crimson, Yellow However, the same result as in Example 2 was observed. The ink in printing in which the fountain solution composition of the present invention is used is not limited to these, and is also effective for fluorescent inks, matte inks, various intermediate job inks, and the like.
In addition to the heat set type off-wheel ink, the non-heat type off-wheel ink used for newspaper printing, and the sheet-fed process ink, the fountain solution composition of the present invention is useful, In particular, the heat set type off-wheel ink is preferable because the effect of the fountain solution composition of the present invention is remarkably exhibited.

Claims (5)

  A triol acyclic hydrocarbon compound having 3 OH groups and a total carbon number of 6 to 10, wherein 2 OH groups out of the 3 OH groups are attached to the 1st and 2nd carbon atoms, respectively. A fountain solution composition for lithographic printing, comprising at least one triol acyclic hydrocarbon compound bonded thereto.   The lithographic printing wet according to claim 1, wherein the triol compound is at least one selected from 1,2,6-hexanetriol, 1,2,8-octanetriol, and 1,2,10-decanetriol. Shimizu composition. The lithographic printing wet according to claim 1 or 2, further comprising at least one compound represented by the following general formula (I) and at least one compound represented by the following general formula (II): Shimizu composition.
R ¹ —O— (CH ₂ CHR ² O) _m —H (I)
(In the formula, R ¹ represents an alkyl group having 1 to 4 carbon atoms, R ² represents a hydrogen atom or a methyl group, and m represents an integer of 1 to 3).
HO— (CH ₂ CH (CH ₃ ) O) _n —H (II)
(In the formula, n represents an integer of 1 to 5.)   Furthermore, at least 1 sort (s) of compounds chosen from the compound which added ethylene oxide and propylene oxide to ethylenediamine, and the compound which added ethylene oxide and propylene oxide to diethylenetriamine are contained in any one of Claims 1-3. Fountain solution for lithographic printing.   A heat-set-off-ring printing method using the heat-set type off-wheel ink and the fountain solution composition according to any one of claims 1 to 4.