JP4727967B2 - Concentrated fountain solution for printing and fountain solution for printing - Google Patents

Description

The present invention relates to a concentrated fountain solution for printing and a fountain solution for printing that can be used for offset printing and the like.

A printing plate used for offset printing has an image portion and a non-image portion formed on the same plane. And the image area is oleophilic (hydrophobic) and is treated so as to be highly receptive to oil-based ink and not receptive to water, while the non-image area is hydrophilic ( It is treated so as to be highly receptive to water and not receptive to oil-based inks.
In offset printing using an offset printing plate subjected to such treatment, first, dampening water is supplied onto the printing plate to form a uniform and thin water film on the hydrophilic non-image area. is necessary. Since the portion covered with this water film can repel oil-based ink and prevent adhesion, it is important to completely form this water film in the non-image area. Further, after dampening the non-image area on the printing plate with dampening water, the oil-based ink is transferred only to the oleophilic image area, and the ink image formed on this printing plate is blanket, then printed Transfer to the body to obtain printed matter.

Here, the fountain solution used may be water most simply. However, water alone does not sufficiently satisfy the function as the fountain solution. For example, when the supply amount of the fountain solution is reduced, the ink is easily transferred to the non-image area. Therefore, usually, in order to improve such printing defects, it is necessary to optimize the viscosity, pH value and emulsification characteristics for printing ink, and to reduce the difference in locally different amounts of water. Therefore, a viscosity modifier, a hydrophilic agent, a buffering agent, a solubilizing agent, a wetting agent, an antifoaming agent and the like are added and blended.

In such a fountain solution for printing used in conventional offset printing, it is very difficult to adjust the supply amount of the fountain solution so as not to generate stains during printing. In order to improve the point, a fountain solution for printing containing 1 to 20% by mass of isopropyl alcohol in the fountain solution has also been proposed (for example, see Patent Document 1).

However, this isopropyl alcohol corresponds to a dangerous substance in the Fire Service Law, and is also regulated by the organic solvent poisoning prevention regulations of the Industrial Safety and Health Law, which is not preferable in terms of fire fighting and work environment. Therefore, a fountain solution for printing that does not contain isopropyl alcohol at the level below the regulation of the organic solvent poisoning prevention regulations (less than 5% by mass in the fountain solution for printing) is desired. Various fountain solution compositions for printing have been proposed (see, for example, Patent Document 2 and Patent Document 3). However, there is still room for ingenuity to facilitate the adjustment of the dampening water supply amount.
JP 54-114302 A Japanese Patent Laid-Open No. 03-155991 Japanese Unexamined Patent Publication No. 06-206391

The object of the present invention is to solve the problems in fire fighting and safety and health due to the use of conventional isopropyl alcohol, facilitate the adjustment of the dampening water supply amount in the printing operation, and eliminate the occurrence of stains on the printed matter. It is to provide a concentrated fountain solution for printing and a fountain solution for printing.

As a result of repeated studies to solve the above problems, the present inventors have found that the above problems can be easily solved by containing polyoxypropylene methyl glucoside, and have completed the present invention. When the concentrated fountain solution for printing or the fountain solution for printing of the present invention is used, the isopropyl alcohol can be reduced to less than 5% by mass and can be completely eliminated, and the above problem can be solved brilliantly. .
That is, the present invention provides (1) the following chemical formula ( 2 );

It is related with the concentration dampening solution composition for printing or the dampening solution composition for printing containing the polyoxypropylene methyl glucoside represented by these.
Further, the present invention provides (2) the fountain solution for printing described in the above item (1), wherein the polyoxypropylene methyl glucoside is added in an amount of 0.001% by mass to 0.00. The present invention relates to a fountain solution for printing containing 2% by mass.

Hereinafter, the concentrated fountain solution for printing and the fountain solution for printing of the present invention will be described in detail.
The fountain solution for printing is obtained by diluting the concentrated fountain solution for printing, and is usually diluted with water or the like during printing.

The concentrated fountain solution for printing and the fountain solution for printing of the present invention contain polyoxypropylene methylglucoside represented by the chemical formula (1).
By including the polyoxypropylene methyl glucoside, the isopropyl alcohol content can be reduced to less than 5% by mass, and can be eliminated altogether. The adjustment of the supply amount can be facilitated, and the occurrence of stains on the printed matter can be eliminated.

In the fountain solution composition for printing of the present invention, the content of the polyoxypropylene methylglucoside represented by the chemical formula (1) is a fountain solution composition for printing from the viewpoint of sufficiently obtaining the effects of the present invention. A preferable lower limit is 0.001% by mass and a preferable upper limit is 0.2% by mass based on the total mass of the product.

As a typical method for containing the polyoxypropylene methylglucoside represented by the chemical formula (1) in the fountain solution for printing of the present invention, for example, (a) the compound is previously added at the time of preparation of the concentrated fountain solution for printing. A method of containing, (b) a method of adding the compound in advance at the time of preparation of the concentrated fountain solution for printing, and a method of adding it by post-addition; Methods and the like. In addition, from the viewpoint of sufficiently obtaining the effects of the present invention, the final dampening water composition is added with the polyoxypropylene methylglucoside represented by the chemical formula (1), and the dampening water composition for printing. Any method can be suitably used as long as it can be contained in a range of 0.001% by mass or more and 0.2% by mass or less based on the total mass.

As a method of containing the polyoxypropylene methylglucoside represented by the chemical formula (1) at the time of preparing the above-mentioned (a) concentrated fountain solution for printing, for example, based on the total mass in the concentrated fountain solution for printing Preferably, the compound is added so as to be in a range from 0.07% by mass to an amount that can be dissolved in the concentration and fountain solution for printing, and other materials are added as necessary. The method of stirring and mixing with a normal stirrer can be mentioned.
The concentrated fountain solution for printing thus obtained is usually diluted about 50 to 200 times as an appropriate dilution range and used as a fountain solution for printing.

(B) As a method of adding the compound at the time of preparation of the concentrated fountain solution for printing in advance, and further adding by post-addition, for example, adding the compound and other materials as appropriate to water as needed, After preparing a concentrated fountain solution for printing by a method of stirring and mixing with an ordinary stirrer, the compound is further dissolved in a diluent such as water and then added, or the diluted fountain solution is used. The method of adding a compound after-mentioned is mentioned.
The concentrated fountain solution for printing is usually diluted about 50 to 200 times as an appropriate dilution range and used as a fountain solution for printing.

As a method of post-adding to the fountain solution composition that does not contain the compound (c), for example, the compound is preferably added to the fountain solution composition for printing from 0.001% by mass. A method of adding to the fountain solution for printing so that it is in the range of 0.2% by mass, further adding other materials as necessary, and stirring and mixing with a normal stirrer can be mentioned.

The concentrated fountain solution for printing and the fountain solution for printing of the present invention are basic as a concentrated concentrated fountain solution for printing and a fountain solution for printing, and as a pH adjuster. Alternatively, by using an acidic compound singly or in combination of two or more, it can be used as an alkaline or acidic concentrated fountain solution for printing and a fountain solution for printing.
As the basic pH adjuster, inorganic bases such as silicate, caustic soda and sodium carbonate can be used. As acidic pH adjusters, acidic compounds such as citric acid and phosphoric acid can be used.

Examples of other materials blended in the concentrated fountain solution for printing and the fountain solution for printing of the present invention include the following.
As a leveling agent or leveling aid, phosphates such as 1 to 3 sodium phosphate, 1 to 3 potassium phosphate, 1 to 3 ammonium phosphate, sodium ammonium phosphate, sodium polyphosphate, potassium or ammonium, Furthermore, boric acid metal salts, citric acid metal salts, tartaric acid metal salts, sulfate metal salts, nitrate metal salts, bicarbonate metal salts, bases such as aluminum alum, formic acid, acetic acid, succinic acid, glutaric acid, maleic acid, phthalic acid, Sitcolanic acid, itaconic acid, fumaric acid, tricarballylic acid, glycolic acid, butyric acid, valeric acid, lactic acid, tartaric acid, propionic acid, oxalic acid, malonic acid, thioglycolic acid, malic acid, citric acid, gluconic acid, pyruvic acid, Glycolic acid, salicylic acid, adipic acid, hydroacrylic acid, glyceric acid, p-toluenesulfonic acid and these Shokushio, organic amine salts and the like can be appropriately used depending on the application. Moreover, these can be used individually or in mixture.

As wetting agents, gum arabic, carboxymethyl cellulose, pectin, polyvinyl pydridone, polyvinyl alcohol, methyl vinyl ether, maleic anhydride copolymer, alginic acid, alcohols, glycols, glycol mono- or diethers, glycerins, etc. Can be used.
As the surfactant, glycerin fatty acid ester, polyglycerin fatty acid ester, propylene glycol fatty acid ester, pentaerythritol fatty acid ester, polyoxyethylene compound and the like can be used.
As the rust preventive agent, amines such as triethanolamine and triethylamine, sodium nitrite, dicyclohexylammonium nitrite and the like can be used.
As the antifoaming agent, a silicon-based antifoaming agent or the like can be used.
As preservatives, dissociable fluorine compounds, phenol and derivatives thereof, imidazole derivatives, 4-isothiazolin-3-one derivatives, and the like can be used.
As a chelating agent, EDTA-2Na or the like can be used.
As the hydrophilic main compound, phosphate, phytate, hexaamine cobalt salt and the like can be used.

The concentrated fountain solution for printing and the fountain solution for printing of the present invention have the above-mentioned constitution, and isopropyl alcohol can be eliminated to less than 5% by mass or even at all. There is no problem in terms of safety and hygiene, and when used for offset printing, it is possible to easily adjust the amount of dampening water supplied and prevent the printed matter from becoming dirty. is there.

EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention concretely, this invention is not limited at all by these Examples.

Examples 1-7, Comparative Examples 1-4
Each material was stirred and mixed, and various fountain solution compositions for Examples 1 to 7 and Comparative Examples 1 to 4 were prepared so as to have the compositions shown in Table 1 below. In addition, the unit of the addition amount in a table | surface is mass. The structure of polyoxypropylene methyl glucoside (product name: Glycopolyol, manufactured by Nippon Oil & Fats Co., Ltd.) in Table 1 is as shown in the following chemical formula (2).

<Printing test>
Using the printing fountain solution compositions of Examples 1 to 7 and Comparative Examples 1 to 4, printing was performed with an offset printer, and the following items were evaluated.
<Printing test conditions>
Printing machine: Mitsubishi diamond chrysanthemum four-color machine (dampening water mechanism: continuous water supply mechanism) (Mitsubishi Heavy Industries, Ltd.)
Printing ink: Offset ink for sheet-fed printing (manufactured by Sakata Inx)
Printing speed: 8000 sheets / hour Temperature / Humidity: 25 ° C / 60%
Printing paper: OK Topcoat N 73K (Oji Paper Co., Ltd.)
Number of copies: 5000 sheets

<Evaluation test>
[Dirt]
Contamination was evaluated by the number of printed copies at the time when the smear occurred when a printing test was performed. That is, the larger the value, the slower the occurrence of dirt. The results are shown in Table 1.
[Density change]
Regarding the density change, a printing test was performed, and the density change in the solid portion of the printed material was visually observed and indicated by the degree. The results are shown in Table 1.
[Roller strip]
The roller strip was subjected to a printing test and evaluated by the number of printed copies when the roller strip was generated. The results are shown in Table 1.

From the results shown in Table 1, the printing fountain solutions of the present invention of Examples 1 to 7 are free from the occurrence of smudges on the printed materials as compared with the printing fountain solutions of Comparative Examples 1 to 3. It turns out that it has the outstanding physical property that a density | concentration change and a roller strip do not generate | occur | produce. Moreover, the fountain solution for printing of the present invention of Examples 1 to 7 can have an isopropyl alcohol content of less than 5% by mass, and the fountain for printing of Comparative Example 4 containing a large amount of isopropyl alcohol. Unlike the water composition, it can be seen that there is no problem in terms of fire and safety.

The concentrated fountain solution for printing and the fountain solution for printing of the present invention have the above-mentioned constitution, and isopropyl alcohol can be eliminated to less than 5% by mass or even at all. There is no problem in terms of safety and hygiene, and when used for offset printing, it is possible to easily adjust the amount of dampening water supplied and prevent the printed matter from becoming dirty. is there.

Claims (2)

The following chemical formula (2);

A concentrated fountain solution for printing or a fountain solution for printing, comprising polyoxypropylene methyl glucoside represented by the formula: The fountain solution composition for printing according to claim 1, wherein the fountain solution composition for printing contains 0.001 mass% to 0.2 mass% of the polyoxypropylene methylglucoside. Dampening water composition.