JP2001342391A - Dryer for planographic printing ink and printing ink composition containing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dryer for a printing ink which can achieve at a high drying rate of the ink on the surface of a printing paper and prevent the skinning on the ink surface during storage and printing, and to provide a printing ink composition containing the dryer. SOLUTION: The dryer is prepared by allowing porous particles to adsorb metal salts of fatty acids and an antioxidant thereon. The printing ink composition contains the dryer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing ink dryer used as a drying accelerator for an oxidative polymerization drying type printing ink represented by a sheet-fed lithographic ink, and a printing ink containing the same. More specifically, in a container during storage of printing ink, and on a printing press during printing, to suppress the drying of the ink surface, and after printing,
The present invention relates to a printing ink dryer that does not delay drying of ink on paper, and a printing ink containing the same.

[0002]

2. Description of the Related Art A so-called dryer is added to an oxidative polymerization drying type printing ink represented by a sheet-fed lithographic ink as a drying accelerator for drying the ink. For printing ink dryers, cobalt, manganese, lead,
Salts of metals such as 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 soaps are used.

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

[0004] Commercially available printing ink compositions are used in combination with a so-called dryer and a drying inhibitor to prevent skinning of the ink surface on a printing machine during storage and printing of the ink, and to prevent the ink from forming on the printing paper. It is common to balance the drying properties of the printing ink. However, this method prevents the skinning of the ink surface at the time of storing or printing the ink at the expense of the drying property at the time of printing, and the effect of preventing skinning is not sufficient.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to achieve a high balance between the anti-skinning property of the ink surface in a container and a printing press during ink storage and the drying property of the printing ink on paper. A lithographic printing ink dryer and a printing ink containing the same.

[0006]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that porous particles adsorbed with a drying inhibitor used as a drying accelerator for an oxidative polymerization drying type printing ink and a drying inhibitor such as an antioxidant. Was added to the printing ink to solve the above problem. That is, a first configuration of the present invention is a lithographic printing ink dryer characterized in that a fatty acid metal salt and an antioxidant are adsorbed on porous particles.

The porous particles have an oil absorption of 0.05 ml / g or more.
It is preferably 5 ml / g, porous particles having an average particle size of 0.1 μm to 10 μm, and more preferably silica gel. Fatty acid metal salts include 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 It is preferred that Further, the porous particles are preferably hydrophobic silica gel, and the antioxidant is preferably a water-soluble antioxidant.

A second aspect of the present invention is a lithographic printing ink composition comprising a lithographic printing ink dryer having a fatty acid metal salt and an antioxidant adsorbed on porous particles.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the constitution of the present invention, a drying agent used as an ink drying accelerator and a water-soluble drying inhibitor such as an antioxidant are added to a printing ink in a form adsorbed on porous particles. Things. According to the present invention, the drier and the drying inhibitor are localized in the container or the printing press when storing the ink, and the drier is deactivated. for that reason,
Drying of ink in a container or on a printing press, that is, skinning is suppressed. On the other hand, when the ink is printed on paper, the water-soluble drying inhibitor elutes into the fountain solution used for lithographic printing, and an active dryer promotes the drying of the ink on the printing paper. ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to achieve both the prevention of skinning of the ink surface in a container or on a printing machine at the time of ink storage and the drying property of the printing ink on paper.

[0010] The dryer used in the present invention may be any as long as it is generally used as a dryer in an oxidative polymerization drying type printing ink represented by a planographic printing ink. For example, metals such as cobalt, manganese, lead, iron, zinc, calcium, cerium, and rare earths, and carboxylic acids such as octylic acid, naphthenic acid, neodecanoic acid, tung oil, linseed oil, soybean oil, and resin acid Salt, ie metal soap, or cobalt, manganese, lead, iron,
Borates with metals such as zinc, calcium and cerium are used. In the present invention, these dryers may be used alone or in combination of two or more.

As the water-soluble drying inhibitor used in the present invention, antioxidants such as ascorbic acid and phosphoric acid, sugar alcohols such as sorbitol, polyhydric alcohols and amines are used. In the present invention, these water-soluble drying inhibitors may be used alone or in combination of two or more.

The porous particles used in the present invention include:
With an oil absorption of 0.05 ml / g to 5 ml / g and a particle size of 0.1
Those having a range of 10 to 10 μm are preferred. Specifically, porous silica gel and the like can be mentioned. Also, as porous particles,
It is preferable to use hydrophobic ones rather than hydrophilic ones. This is because, when hydrophilic particles are used, due to the difference in affinity with the particles, the hydrophilic drying inhibitor has a structure in which the particles are coated inside the particles, and the drying accelerator covers the particles. This is because the water-soluble drying inhibitor hardly elutes when contacted.

When a dryer or a drying inhibitor is adsorbed on the porous particles, the drying agent is applied to a volatile organic solvent such as benzene, toluene or xylene, and the drying inhibitor is applied to a hydrophilic solvent such as water or alcohol. It is preferable to use those dissolved respectively. The concentration of the solution is preferably in the range of 5 to 70 wt%. The order in which the porous particles are adsorbed may be such that the dryer is adsorbed first, or the drying inhibitor may be adsorbed first. Alternatively, a mixture of a dryer and a drying inhibitor may be adsorbed. After adsorbing the dryer and the drying inhibitor to the porous particles, it is preferable to remove volatile components in the particles by vacuum drying or the like. The amount of the drying inhibitor to be added is preferably in the range of 0.1 to 40% by weight based on the dryer.

[0014]

The present invention will be described below with reference to examples. In the example,
Parts mean parts by weight, and% means% by weight. Also,
The present invention is not limited to the following examples.

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: 4.0).
5 μm) and then vacuum dried for 1 hour to remove benzene. The mixture obtained after drying is mixed with 20 parts of a 5% aqueous solution of ascorbic acid. Thereafter, silica gel fine particles (dryer A) adsorbing cobalt naphthenate and ascorbic acid were obtained by vacuum drying for 1 hour.

Example 2 50 parts of a 30% benzene solution of cobalt naphthenate (manufactured by Dainippon Ink and Chemicals, Inc.) was mixed with hydrophobic silica gel (oil absorption: 2.5 ml / g, average particle size: 4.5).
μm) and then vacuum dried for 1 hour to remove benzene. The mixture after drying is mixed with 20 parts of a 20% aqueous sorbitol solution. Thereafter, by vacuum drying for one hour, silica gel fine particles (dryer B) adsorbing cobalt naphthenate and sorbitol were obtained.

The silica gel fine particles containing (dryer A) and the drying inhibitor obtained in Example 1 or 2
(Dryer B) was mixed on a three-roll mill with the following printing ink composition. Obtained ink (hereinafter raw ink)
And 15% water added thereto and mixed in an automatic mortar for 5 minutes (hereinafter referred to as emulsified ink) at 25 ° C. and 60% humidity.
Each drying time was evaluated under%.

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 of the ink on the printing paper. Table 1 shows the drying times of the raw ink and the corresponding emulsified ink. The table also shows, for comparison, the drying time of a printing ink to which cobalt naphthenate not adsorbed on silica gel particles was added and a printing ink to which no dryer was added, as a dryer.

(Ink Composition) Pigment (Phthalocyanine Blue, manufactured by Dainippon Ink and Chemicals) 20% Varnish (manufactured by Dainippon Ink and Chemicals) 60% Solvent (No. 6 solvent, manufactured by Nisseki Mitsubishi) 17% Dryer The content is shown in Table 1. Description

[0020]

[Table 1]

[0021]

According to the present invention, the oxidative polymerization type printing ink dryer obtained by the present invention and the porous particles having the water-soluble drying inhibitor adsorbed thereon are added to the printing ink, so that the ink can be stored in a container during printing ink storage or printing. Thus, it is possible to provide a dryer and a printing ink that can achieve a high level of prevention of skinning of the ink surface on a printing press and drying of the ink on printing paper.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideo Nishii 3-56-1, Miyatacho, Takatsuki-shi, Osaka F-term (reference) 4J037 AA18 CB04 CB09 CB16 CB22 CB26 DD05 DD07 DD30 EE03 EE28 EE35 EE43 EE47 FF30 4J039 BA21 BE01 BE12 CA04 EA10 GA02

Claims (6)

[Claims] 1. A lithographic printing ink dryer characterized in that a fatty acid metal salt and an antioxidant are adsorbed on porous particles. 2. The porous particles have an oil absorption of 0.05 ml / g.
The lithographic printing ink dryer according to claim 1, wherein the lithographic printing ink is a porous particle having a mean particle size of 0.1 to 10 µm at a concentration of ５5 ml / g. 3. The lithographic printing ink dryer according to claim 1, wherein the porous particles are silica gel. 4. The method according to claim 1, wherein 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 1-3 which are
A lithographic printing ink dryer according to any one of the above. 5. The method according to claim 1, wherein the porous particles are hydrophobic silica gel, and the antioxidant is a water-soluble antioxidant.
4. The dryer for lithographic printing ink according to any one of 4. 6. A printing ink composition comprising a lithographic printing ink dryer in which a fatty acid metal salt and an antioxidant are adsorbed on porous particles.