JP2001341458A - Wetting water for lithographic printing and printing method employing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing method and wetting water for lithographic printing employed for the method, capable of reducing the containing amount of dryer in a printing ink, achieving the prevention of generation of scum on the surface of the ink upon printing ink storage or printing and capable of obtaining coating film drying property upon printing. SOLUTION: The lithographic printing method employs the wetting water for lithographic printing containing a dryer for the lithographic printing ink, obtained by adsorbing aliphatic acid metallic salt to porous grains, under a condition that the dryer is dispersed into the water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fountain solution containing an oxidative polymerization drying type printing ink dryer and a method of using the same.

[0002]

2. Description of the Related Art A dryer is added to an oxidative polymerization drying type printing ink typified by a lithographic printing ink as a drying accelerator for drying the ink. As a dryer for printing inks, salts of metals such as cobalt, manganese, lead, iron, and zinc with carboxylic acids such as octylic acid, naphthenic acid, neodecanoic acid, tung oil, linseed oil, soybean oil, and resin acid; That is, metal soap is used.

On the other hand, when a printing ink is stored in a container,
In addition, hydroquinone, methoquinone, t-butylhydroquinone, and the like are added as a drying inhibitor to suppress skinning due to drying of the ink surface on a printing press during printing.

[0004] Commercially available printing ink compositions are used in combination with the above-mentioned dryer and a drying inhibitor to improve the drying property of printing ink on printing paper and the ink in a container during storage of the ink or on a printing machine during printing. Is generally balanced with the anti-skinning property of the ink surface. However, this method prevents the skinning of the ink surface in a container or on a printing machine at the expense of the drying property at the time of printing, and its skinning preventing effect is not sufficient.

[0005]

An object of the present invention is to provide a high balance between the anti-skinning property of the ink surface in a container at the time of storage and on a printing press at the time of printing and the drying property of the printing ink on paper. To make it happen. Further, the amount of a drying inhibitor such as hydroquinone, methoquinone, or t-butylhydroquinone, and the amount of a dryer added to the printing ink may be reduced.

[0006]

Means for Solving the Problems The above problem has been solved by finding that by including a drier in dampening water, the amount of the drier in the ink can be reduced, which contributes to prevention of skinning during storage. . That is, a first configuration of the present invention is a fountain solution for lithographic printing characterized by containing a fatty acid metal salt. The second configuration is characterized in that, as the dampening solution, a lithographic printing dampening solution containing a lithographic printing ink dryer in which fatty acid metal salts are adsorbed on porous particles and dispersed in water is used. This is a lithographic printing method.

The dryer, that is, the fatty acid metal salt can be added in a state of being adsorbed on the porous particles. The porous particles have an oil absorption of 0.05 ml / g to 5 ml / g,
Porous particles having an average particle diameter of 0.1 μm to 10 μm or hydrophobically treated on the surface are preferably used.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is to add a lithographic ink dryer to fountain solution used for lithographic printing. By adding a drier which has conventionally been added to printing ink to dampening water, it is possible to provide a drier which is a drying accelerator and an ink which does not contain any polymerization inhibitor such as hydroquinone which suppresses its activity. . In addition, since no dryer is contained, skinning of the ink surface in a container during storage or on a printing machine during printing can be prevented.

In the present invention, a dryer used for the oxidation polymerization type printing ink and a fountain solution for lithographic printing are dispersed and stirred by a homogenizer or an ultrasonic generator or the like. The amount of the dryer to be added to the fountain solution is preferably in the range of 0.01 to 5% by weight based on the fountain solution. If the drier is difficult to disperse in dampening water, a surfactant such as isopropyl alcohol may be added. The obtained dryer dispersion is used as a dampening solution at the time of printing. The fountain solution contacts the printing ink composition on the plate used for lithographic printing. At that time, the dryer moves into the ink, and after the ink is printed on the paper surface, promotes drying of the ink on the paper surface.

The dryer used in the present invention may be any dryer that is used for an oxidative polymerization drying type printing ink represented by a lithographic printing ink. For example, salts of metals such as cobalt, manganese, lead, iron, zinc, calcium, cerium, and rare earth with carboxylic acids such as octylic acid, naphthenic acid, neodecanoic acid, stearic acid, tung oil, linseed oil, and resin acid; That is, metal soap, and
Borates with metals such as cobalt, manganese, lead, iron, zinc, calcium, cerium, and rare earths, and peroxides such as hydrogen peroxide are used. In the present invention, these dryers may be used alone or in combination of two or more.

When the dryer used in the present invention is solid,
It is preferable to pulverize the powder so that the particle diameter becomes 20 μm or less and then to add it to the fountain solution. When the drier is waxy, the drier is dissolved in an organic solvent soluble in a drier such as benzene or xylene, and the drier solution is adsorbed on porous fine particles such as porous silica gel to form fine particles and wet. It is preferable to add to water. When the dryer to be used is a liquid, it may be added to the dampening solution as it is, or may be added by being adsorbed on porous fine particles such as porous silica gel.

When the dryer is adsorbed on the porous particles, the oil used has an oil absorption of 0.05 ml / g to 5 ml / g.
g, hydrophobicity with an average particle size of 0.1 μm to 10 μm, or surface-treated with hydrophobicity is preferable.

[0013]

The present invention will be specifically described below with reference to examples. In the examples, “parts” means “parts by weight” and “%” means “% by weight”. Further, the present invention is not limited to the following embodiments.

Example 1 50 parts of a 30% benzene solution of cobalt naphthenate (manufactured by Dainippon Ink and Chemicals, Inc.) was treated with hydrophobic silica gel (oil absorption: 2.5 ml / g, average particle size: 4.5).
μm) 20 parts. Thereafter, benzene was removed by vacuum drying for 1 hour to obtain a powdery core material, that is, silica gel particles having cobalt naphthenate adsorbed thereon. Distilled water 9.5
0.12 parts of a core material is added to a mixed solution of 0.5 parts of isopropyl alcohol and 0.5 parts of isopropyl alcohol. The core material was dispersed in the mixed solution using an ultrasonic generator to obtain a drier containing a dryer (A).

Example 2 0.15 parts of powdery cobalt stearate (manufactured by Dainippon Ink and Chemicals, Inc.) was mixed with distilled water 9.
Add to a mixed solution of 5 parts and 0.5 parts of isopropyl alcohol. A drier-containing dampening solution (B) in which cobalt stearate was dispersed in the mixed solution using an ultrasonic generator was obtained.

After mixing 5 parts of the fountain solution obtained in Examples 1 and 2 with 10 parts of the oxidative polymerization drying type printing ink containing no drier in an automatic mortar for 5 minutes, the ink from which excess water was removed (hereinafter referred to as “the ink”). The drying time of emulsified ink) is 25 ° C and humidity is 60%
Was evaluated under For comparison, the drying time of an ink that was not emulsified (hereinafter referred to as “raw ink”) was also evaluated. In addition, the oxidative polymerization drying type printing ink which does not contain a dryer is what was mixed on three rolls with the following composition.

The drying time of the raw ink is a measure of the drying time of the ink surface in the container when storing the printing ink and on the printing press during printing. On the other hand, the drying time of the emulsified ink is a measure of the drying time on the printing paper. Table 1 shows the drying times of the raw ink and the corresponding emulsified ink. In the table, for comparison, for the printing ink (cobalt content 0.06%) directly added with cobalt naphthenate or cobalt stearate as a drier and for the printing ink without a drier, drying of the raw ink and 15% emulsified ink The time is also shown.

(Ink composition) Pigment (Phthalocyanine blue manufactured by Dainippon Ink and Chemicals) 20% Varnish (Dainippon Ink and Chemicals) 60% Solvent (Nisseki Mitsubishi No. 6 solvent) 17%

[0019]

[Table 1]

In the table, (* 1) indicates a drier contained in dampening water, and (* 2) indicates a drier contained in ink.

[0021]

By using the fountain solution containing the dryer obtained in the present invention, the content of the dryer in the printing ink can be reduced, and the ink surface can be prevented from being skinned during storage and printing of the printing ink. In addition, it is possible to achieve a high level of dryness of the ink on the printing paper in a well-balanced manner.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hideo Nishii 3-56-1, Miyatacho, Takatsuki-shi, Osaka Kato Heights F-term (reference) 2H114 AA04 DA09 DA15 DA25 DA78 EA08 FA16 GA23

Claims (6)

[Claims] 1. A fountain solution for lithographic printing, comprising a fatty acid metal salt. 2. The fountain solution for lithographic printing according to claim 1, comprising a fatty acid metal salt adsorbed on the porous particles. 3. The method according to claim 1, wherein the porous particles have an oil absorption of 0.05.
ml / g to 5 ml / g, average particle size 0.1 μm to 10 μm
3. The fountain solution for lithographic printing according to claim 1, wherein the fountain solution is a porous particle having a hydrophobic property of m or a hydrophobic surface. 4. The fountain solution for lithographic printing according to claim 1, wherein the porous particles are silica gel whose surface is subjected to hydrophobic treatment. 5. The fatty acid metal salt is cobalt, manganese,
Salts of metals selected from lead, iron, zinc, calcium, cerium, and rare earths with carboxylic acids selected from octylic acid, naphthenic acid, neodecanoic acid, stearic acid, tung oil, linseed oil, soybean oil, and resin acid Claims 1-4 which are
A fountain solution for lithographic printing according to any one of the above. 6. A lithographic printing fountain solution comprising, as a fountain solution, a lithographic printing ink fountain solution containing a lithographic printing ink dryer in which fatty acid metal salts are adsorbed on porous particles in a state of being dispersed in water. Printing method.