JP2000351944A - Drier for printing ink, production of the same drier and printing ink composition comprising the same drier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drier for printing ink which enables the drying property of ink on the surface of printing paper and the antiskinning property on the surface of ink in storing and printing the printing ink to be attained at high level, to provide a method for producing the drier and to provide a printing ink composition comprising the same drier. SOLUTION: This drier is a water-soluble polymer gel-type printing ink drier featuring that it comprises a metallic soap-containing water-soluble polymer gel. This method for producing a water-soluble polymer gel-type printing ink drier features dispersing both an aqueous solution of a water-soluble polymer and a metallic soap in a first organic solvent and adding the dispersion in a second solvent which is a nonsolvent for the water-soluble polymer and is hydrophilic to precipitate the water-soluble polymer containing the metallic soap. This printing ink composition features comprising a water-soluble polymer gel-type printing ink drier comprising a water-soluble polymer gel containing a metallic soap.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dryer for a printing ink of an oxidative polymerization drying type printing ink represented by a sheet-fed lithographic ink, a method for producing the dryer, and a printing ink composition containing the dryer. More specifically, the present invention relates to a printing ink capable of suppressing skinning due to drying of the ink surface during storage of the printing ink and during printing without delaying drying of the ink on printed matter during printing. The present invention relates to a dryer, a method for producing the same, and a printing ink composition containing the same.

[0002]

2. Description of the Related Art In order to dry an oxidative polymerization drying type ink represented by a sheet-fed lithographic ink on a printing paper surface, a metal such as cobalt, manganese, lead, iron and zinc and octylic acid, naphthenic acid, A method of incorporating a salt with a carboxylic acid such as neodecanoic acid, that is, a metal soap, into the ink has been adopted. On the other hand, in order to suppress skinning due to drying of the ink surface during storage of printing ink and during printing, hydroquinone, methoquinone, t
A method of incorporating butyl hydroquinone or the like into an ink is known.

[0003] Commercially available printing ink compositions use the above-mentioned dryers and drying inhibitors in combination to dry the printing ink on the printing paper surface and to prevent the ink surface from swelling during storage or printing. Is generally used. However, in this method, in principle, drying of the ink at the time of printing is sacrificed, and skinning of the ink surface at the time of ink storage or printing is prevented. In addition, the anti-skinning effect was not always sufficient.

As a known technique, for example, Japanese Patent Laid-Open No.
No. 2776 describes a method of microencapsulating metal soap to balance the drying property of printing ink on printing paper with the anti-skinning property of the ink surface during storage or printing of the ink. However, in this method, since the metal soap is amphiphilic, stable coacervation cannot be formed and microencapsulation is difficult.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to use a water-soluble polymer containing a metal soap as a dryer for printing ink, to improve the drying property of the ink on the printing paper surface, to store the printing ink, and to perform printing. It is an object of the present invention to provide a printing ink dryer capable of preventing the ink surface from being skinned at a high level, a method for manufacturing the printing ink dryer, and a printing ink composition containing the same.

[0006]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that by using a water-soluble polymer gel containing a metal soap as a dryer for printing ink, the drying property of the ink on the printing paper surface and the printing can be improved. The present inventors have found that prevention of skinning of the ink surface during ink storage and printing can be achieved at a high level, and have led to the present invention. That is, a first configuration of the present invention is a water-soluble polymer gel-type printing ink dryer characterized by containing a water-soluble polymer gel containing metal soap.

A second structure of the present invention comprises a step of dispersing an aqueous solution of a water-soluble polymer and a metal soap in a first organic solvent, and the step of dispersing the obtained dispersion with the above-mentioned non-solvent of a water-soluble polymer. And adding a hydrophilic organic solvent to the second organic solvent to precipitate a water-soluble polymer containing a metal soap. Further, a third configuration of the present invention is a printing ink composition comprising a water-soluble polymer gel-type printing ink dryer containing a water-soluble polymer gelled product containing metal soap.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The water-soluble polymer gel-type printing ink dryer according to the present invention is a slurry in which a water-soluble polymer gel containing metal soap is dispersed in an organic solvent, or the organic solvent is separated. It can be obtained in a paste state or a solid state.

As the metal soap, any one can be used as long as it is generally used as a dryer in an oxidative polymerization drying type printing ink represented by a sheet-fed lithographic ink. For example, a salt of a metal such as cobalt, manganese, lead, iron, zinc, calcium, cerium, or rare earth with a carboxylic acid such as octylic acid, naphthenic acid or neodecanoic acid is preferably used. Particularly preferred are manganese octylate, cobalt octylate, manganese naphthenate and the like. In the present invention, these metal soaps may be used alone or in combination of two or more.

The water-soluble polymers constituting the water-soluble polymer gel include gelatin, carboxymethylcellulose, methylcellulose, ethylcellulose, polyvinyl alcohol, gum arabic, sodium alginate, dextran, casein, protein, cellulose, carboxypolymethylene, carrageenan, Agar, starch, polysaccharides, polyvinyl benzene sulfonic acid, styrene-maleic acid copolymer, polyvinyl methyl ether-maleic anhydride copolymer, polyhydroxyethyl acrylate, acrylic acid polymer, sodium acrylate polymer, sodium acrylate -Acrylic ester copolymers, polyacrylamide, nitrocellulose, cellulose acetate phthalate and the like are preferably used. Particularly preferred are gelatin, carboxymethylcellulose, methylcellulose, polyvinyl alcohol and the like. These water-soluble polymers may be used alone or in combination of two or more.

Hereinafter, a method for producing a water-soluble polymer gel type printing ink dryer according to the present invention will be described. The ink dryer according to the present invention converts a dispersion containing a metal soap, an aqueous solution of a water-soluble polymer and a first organic solvent into a second organic solvent (B ) And synthesized.

More specifically, first, a metal soap is dissolved in a first organic solvent (A) and heated. This solution is vigorously stirred with a stirrer such as a homogenizer, and a water-soluble polymer aqueous solution is dropped to obtain a dispersion.

As another method, a dispersion can be obtained by adding a metal soap to a dispersion of the first organic solvent (A) and an aqueous solution of a water-soluble polymer.

Further, a dispersion can be obtained by dropping an aqueous solution of a water-soluble polymer to which a metal soap has been added into the first organic solvent (A).

Subsequently, this dispersion is dropped into the second organic solvent (B) under stirring to precipitate a water-soluble polymer having a metallic soap, and a water-soluble polymer gel having a printing ink dryer function is formed. Obtain a slurry solution.

This slurry solution can be used as it is by adding it to printing ink as a printing ink drier. When the slurry solution is used as it is as a printing ink dryer, the solvent and water in the slurry solution are distilled off to increase the concentration, or after adding another solvent or a high boiling component such as linseed oil, the first organic solvent is used. A low-boiling solvent such as the solvent (A) or the second organic solvent (B) or water may be distilled off and used as another solvent slurry.

The water-soluble polymer gel containing metal soap may be separated from the obtained slurry solution and added to the printing ink in a solid state or a paste state. As a separation method, a method used for solid separation such as centrifugation or filtration is used. Further, the water-soluble polymer gel separated by this method may be washed by repeating dispersion and separation with an appropriate organic solvent in order to remove metal soap adhering to the surface.

Further, although the solvent and water usually remain in the separated water-soluble polymer gel, the gel may be used as it is as a printing ink dryer or dried by a method such as vacuum drying. it can. Further, in order to improve the workability of the separated slurry, the slurry may be mixed with a printing ink solvent or varnish again and used.

In the present invention, when the water-soluble polymer gel is separated, a solution containing a metal soap and an organic solvent added during the synthesis is generated. This solution may be subjected to appropriate waste liquid treatment and discarded, or may be reused as it is or by collecting an organic solvent or the like.

As described above, the metal soap used in the present invention may be any one which is generally used as a dryer for an oxidative polymerization drying type printing ink represented by a sheet-fed lithographic ink.

The first organic solvent (A) used in the present invention
Various solvents are used as follows. Organic solvents capable of dissolving metal soaps such as toluene, xylene, benzene, petroleum solvent, isopropyl alcohol, and butanol and dispersing a water-soluble polymer aqueous solution are preferable, and these are used alone or in combination. Usually, the amount used is preferably in the range of 0.5 to 100 ml per 1 g of metal soap. If it is less than 0.5 ml, the solution viscosity is high and a good dispersion cannot be obtained. When the amount is larger than 100 ml, the yield of the printing ink dryer obtained with respect to the amount of the organic solvent used becomes small, and it is not economical.

As described above, the water-soluble polymer used in the present invention includes various materials, and these water-soluble polymers may be used alone or in combination of two or more. good. The concentration of the aqueous solution of the water-soluble polymer is usually 1
Preferably, it is used in the range of ４０40% by weight. 1% by weight
If the amount is smaller, the amount of the second organic solvent (B) used increases, which is not economical. If the amount is more than 40% by weight, not only does the water-soluble polymer dissolve in water, but also the viscosity of the aqueous solution increases, and it is difficult to obtain a good dispersion, which is not preferable. The aqueous solution of the water-soluble polymer may be used in any amount as long as it can be dispersed in the first organic solvent (A) solution of the metal soap.
A range from 1 g to 10 g is preferred. If the amount is less than 0.1 g, the amount of metal soap not incorporated in the microgel increases, which is not economical. When the amount is more than 10 g, the amount of metal soap contained in the printing ink dryer increases, and in order to maintain the drying property during printing, it is necessary to add a large amount of the printing ink dryer to the printing ink composition, which is economical. is not.

In the present invention, a first organic solvent (A) solution of metal soap is prepared in advance, and this solution is stirred using a disperser such as a homogenizer, and a water-soluble polymer aqueous solution is dropped into this solution. Thus, a dispersion of a water-soluble polymer aqueous solution is obtained. The temperature at this time is preferably 10 ° C. or higher and the boiling point of the solvent or lower. If the temperature is lower than 10 ° C., metal soap and water-soluble polymer are undesirably precipitated. If the temperature is higher than the boiling point of the solvent, not only is it disadvantageous in terms of energy, but it is not preferable because it is necessary to devise an apparatus such as performing dispersion under pressure.

As the second organic solvent (B) for precipitating the water-soluble polymer, an organic solvent which dissolves water and is a non-solvent for the water-soluble polymer is used alone or in combination. Specifically, methanol, ethanol, propanol, isopropanol, butanol, acetone, THF
And the like are preferably used. Particularly preferred are isopropanol, butanol and the like. The amount used is usually preferably in the range of 5 ml to 3000 ml per 1 g of metal soap. If the amount used is less than 5 ml, the dispersion of the gel of the water-soluble polymer becomes insufficient, and only a bulk printing ink dryer can be obtained. If the usage is more than 3000ml,
The yield of the printing ink dryer obtained with respect to the amount of the organic solvent (B) used is small, and it is not economical.

This printing ink dryer is used for a lithographic sheet-fed ink as shown in "Print inks that can be used well" published by Nippon Printing Shimbun. That is, a printing ink is obtained by mixing with a known pigment, varnish, auxiliary agent, etc., and kneading with a kneader, a three-roll mill, a dispersion stirrer, or the like. The amount of printing ink dryer used is 0.1 to 20 during ink formulation.
% By weight is preferred.

[0026]

EXAMPLES The present invention will be described below with reference to examples. However,
The present invention is not limited to the following examples.

(Example 1) 10 g of cobalt octate (manufactured by Dainippon Ink and Chemicals), which is a metal soap, was mixed with toluene /
Dissolve in isopropanol mixed solvent (volume ratio 8: 2) and add 5
Keep at 0 ° C. The solution was vigorously stirred with a homogenizer, and 25 g of a 10% by weight aqueous solution of gelatin (AP250 made by Niigata Gelatin) was gradually dropped as a water-soluble polymer.
Disperse. This dispersion was treated with isopropanol 2000m
Then, the mixture was gradually added dropwise to the mixture under stirring with a homogenizer. At the same time as the dropping, a water-soluble polymer gel containing a metal soap is formed. The obtained water-soluble polymer gel slurry solution is separated into a water-soluble polymer gel and waste liquid by centrifugation. In order to wash the obtained water-soluble polymer gel, the procedure of adding 1000 ml of isopropanol to the obtained water-soluble polymer gel, stirring for several minutes, and then centrifuging to obtain the water-soluble polymer gel again was repeated three times. The washed water-soluble polymer gel was dried under a vacuum of 5 mmHg at room temperature to obtain 1.8 g of a printing ink dryer (a).

(Examples 2 and 3) As a water-soluble polymer, carboxymethyl cellulose (Cellogen 6 manufactured by Daiichi Kogyo Seiyaku) was used.
A) / polyvinyl alcohol (KL506 manufactured by Kuraray) 1: 1 mixture by weight, methyl cellulose (60 manufactured by Shin-Etsu Chemical Co., Ltd.)
SH-50) was used in the same manner as in Example 1 except that 2.7 g of the printing ink dryers (b) and (c) were used.
2.5 g were obtained.

Example 4 The procedure of Example 1 was repeated, except that ethyl acetate was used instead of the toluene / isopropanol mixed solvent, and 1.8 g of a printing ink drier (d) was used.
Obtained.

Example 5 A printing ink drier (e) was prepared in the same manner as in Example 1 except that the obtained printing ink drier was not dried but was blended in a printing ink as an isopropanol slurry solution. )
And

Example 6 The same as Example 1 except that manganese naphthenate was used instead of cobalt octate.
1.7 g of a printing ink dryer (f) was obtained.

Example 7 Soybean oil was added to the washed isopropanol slurry solution of a printing ink drier in an amount of 2.5%.
g of Example 1 except that isopropanol was distilled off to obtain a soybean oil slurry solution for a printing ink dryer.
the same as. This printing ink dryer is referred to as a printing ink dryer (g).

The printing ink dryers obtained in Examples 1 to 7 were mixed with the following printing ink composition on three rolls,
The drying time of the printing ink, 15% by weight of water was added to the printing ink, and the drying time of the ink (hereinafter, emulsified ink) mixed and emulsified in a mortar was measured at 25 ° C. with a drying time measuring device. The drying time of the printing ink is a measure of the drying time of the ink surface on a printing machine during storage and printing of the printing ink, and the drying time of the emulsified ink is a measure of the drying time during printing.

The results are shown in Table 1 together with the drying time of the ink containing the metal soap cobalt octate and manganese naphthenate before being added to the water-soluble polymer and the ink containing no metal soap as a comparative example. Indicated.

(Ink composition) Pigment (Phthalocyanine blue pigment manufactured by Dainippon Ink and Chemicals) 20% by weight Varnish (12X0002 manufactured by Dainippon Ink and Chemicals) 60% by weight Solvent (No. 6 solvent manufactured by Nippon Oil Co., Ltd.) 16% by weight Printing ink dryer (Contents are listed in Table 1)

[0036]

[Table 1]

[0037]

Industrial Applicability According to the present invention, a water-soluble polymer containing a metal soap can achieve a high level of drying property of ink on printing paper and prevention of skinning of the ink surface during storage and printing of printing ink. It is possible to provide a dryer for a printing ink having a gel, a method for producing the ink dryer, and an ink composition containing the ink dryer.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4J039 AB01 AB02 AB07 AD03 AD06 AD09 AD10 AD12 AD14 BA30 BA31 BA34 BA37 BA38 BA39 BC19 BE14 EA02 EA10 EA12 GA02

Claims (3)

[Claims] 1. A water-soluble polymer gel-type printing ink dryer comprising a water-soluble polymer gel containing metal soap. 2. a step of dispersing an aqueous solution of a water-soluble polymer and a metal soap in a first organic solvent;
Adding a non-solvent of the water-soluble polymer to a second organic solvent that is hydrophilic and depositing a water-soluble polymer containing a metal soap. Manufacturing method of printing ink dryer. 3. A printing ink composition comprising a water-soluble polymer gel-type printing ink dryer containing a water-soluble polymer gelled product containing a metal soap.