JPS63186782A - Water-base block-print ink composition - Google Patents

Abstract

PURPOSE:To obtain a block-print ink which has good washability with water and water resistance, by mixing a pigment, an alkali-soluble resin, an alkalizing agent, a high-boiling pt., water-soluble organic solvent, and a polyoxyethylenealkylamine. CONSTITUTION:A polyoxyethylenealkylamine is incorporated into a water-base block-print ink at least consisting of a pigment, an alkali-soluble resin, an alkalizing agent, and a high-boiling pt., water-soluble organic pigment. As the polyoxyethylenealkylamine, which is used to improve the washability with water, polyoxyethylenestearylamine, polyoxyethyleneoleylamine, etc. are preferably used. An example of the alkali-soluble resin, which is used as a fixing agent and vehicle and becomes soluble in water by the use of an alkalizing agent in combination, is a (meth)acrylic resin or a maleic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an aqueous printing ink. More specifically, it has excellent water resistance (hereinafter simply referred to as water resistance) after drying of the printed portion on paper, and is also easy to remove ink that adheres to the skin by washing with water (hereinafter simply referred to as water removal resistance). This invention relates to a water-based printing ink with good quality.

(Prior Art) Conventionally, two types of printing inks have been used: oil-based or neutral (water-in-oil emulsion) types. Although both types of printing ink can produce prints with excellent water resistance, the ink has a strong odor, and if the ink gets on your hands or fingers, it can only be removed by washing with kerosene or abrasive soap. Because it had the disadvantage that it was not.

This was especially inconvenient for use by young people such as children and students.

Therefore, in recent years, water-based printing inks containing two pigments, a water-soluble resin, and a high-boiling water-soluble organic solvent as main components have come to be used because they are easy to handle.

(Problems to be solved by the invention) However, the water-based printing ink has excellent water-removal properties;
While there is almost no odor, the water resistance of the one-sided prints is weak, so if water accidentally gets on the print that you have taken a lot of effort to print, the problem is that the print will be ruined.

That is, as mentioned above, improving water-removal properties and improving water resistance are contradictory technical issues, and a printing ink that satisfies both has not yet been obtained.

(Means for Solving the Problems) Therefore, in view of the above problems, the inventors of the present invention have conducted extensive research in order to obtain a printing ink with good water-removal properties and water resistance, and have finally completed the present invention. One aspect of the present invention is an aqueous printing ink comprising at least a pigment, an alkali-soluble resin, an alkaline agent, and a high-boiling water-soluble organic solvent.

It is.

Two aspects of the present invention will be described in detail below.

The pigment is used as a coloring material, and various conventionally known inorganic and organic pigments can be used, but specifically, carbon black, titanium oxide, red iron, ocher,
Hansa Yellow G.

Same 10G, Hahndsienner, Rake Left.

Carmino 3B, Carmino 6B, Ultramarine Blue, Phthalocyanine Blue,
Phthalosoanine green and the like can be appropriately used alone or in combination, and the amount used is preferably 5 to 25% by weight based on the water-based printing ink composition.

The alkali-soluble resin is used as a fixing agent and a coloring agent for the above-mentioned pigments, and becomes soluble in water when used in combination with an alkaline agent, which will be described later. ) Acrylic resin, , z, tyrene-acrylic resin, styrene-maleic acid resin, maleic acid resin, fumaric acid resin, rosin-modified maleic acid resin, etc. can be used, and the amount used is based on the water-based printing ink composition. Te5~2
0% by weight is preferred. Alkali agents are used to solubilize the alkali-soluble resins mentioned above in water, and specifically include ammonia, morpholine, monoethanolamine, jetanolamine, triethanolamine, ethyl monoethanolamine, and n-butyl. Monoethanolamine, dimethylethanolamine.

Diethylethanolamine, ethylgetanolamine, n-butylgetanolamine.

Alkanolamines such as di-n-butylethanolamine, monoisopropanolamine, diisopropanolamine, and triisopropanolamine can be used, and the amount used is determined according to the alkali-soluble resin in the aqueous printing ink composition. It is preferably 10 to 55% by weight.

High-boiling point water-soluble organic solvents are used as drying inhibitors for aqueous printing ink compositions on non-absorbing surfaces such as mixing plates, and specifically include ethylene glycol, /ethylene glycol, triethylene glycol, Glycols such as recall and dipropylene glycol, glycerin, and benzyl alcohol can be used alone or in combination, and the amount used is preferably 10 to 40% by weight based on the aqueous printing ink composition.

Polyoxyethylene alkylamine, which is the essence of the present invention, is used as a water-removal improver, and specifically, polyoxyethylene stearylamine, polyoxine ethylene oleylamine, etc. are preferably used, and the amount used is α5 to 7% by weight based on the printing ink composition is preferable.

In addition to the above ingredients, if necessary, extender pigments such as calcium carbonate and barium sulfate, preservatives and antifungal agents, surfactants such as sodium alkylbenzenesulfonate, and penetration/drying accelerators such as lower aliphatic alcohols may be added. Agents may be used as appropriate. In addition, water-based printing ink is spread with a roller, etc., applied to 3 blocks, and transferred to 2 paper, etc., so it is easy to spread and has physical properties that do not flow when applied to 2 blocks. Although it is necessary.

Regarding the viscosity, the viscosity measurement value using a spread meter described in JIS 5701 Printing Ink Test Method is 40 to 65.
It is preferable that it is between.

Therefore, the aqueous printing ink composition according to the present invention.

It can be obtained by mixing and dispersing the above components using a fractionator such as a three-roll mill for relatively high viscosity compositions.

(Function) The reason why the printing ink composition according to the present invention has excellent water resistance and water removal properties is inferred as follows.

In other words, the alkali-soluble resin, which is the fixing agent in the printing ink composition, is made solubilized in water by an alkaline agent, but since it is originally a substance that is insoluble or poorly soluble in water, it is difficult to print two works. When it dries and the alkaline agent is blown off, it forms a water-resistant film, and the water-removal improver, polyoxine ethylene alkylamine, penetrates very well into the paper used for the work, making it water-resistant. Excellent in
In addition, when it adheres to hands, fingers, etc., the polyoxy/ethylene alkylamine acts like an emulsifier on pigments that have gotten into the unevenness of the skin, so it has excellent water-removal properties. (Example) Below 1 The present invention will be explained in more detail with reference to Examples.
"Parts" indicates "parts by weight."

Example 1 Carbon black 10 parts Precipitated barium sulfate 15 parts Rosin modified maleic acid resin 15 parts Dimethylethanolamine
5 parts glycerin 7 parts triethylene glycol 25 parts isoglobil alcohol 5 parts polyoxyethylene/stearylamine 3 parts water
15 parts The above ingredients were placed in a lab mixer and premixed for 1 hour, and then passed twice in a 6-roll mill to obtain a black aqueous printing ink composition. The measured value of this product using a spread meter was 59 terms.

Comparative Example 1 A black aqueous printmaking ink composition was obtained in the same manner as in Example 1, except that 6 parts of the polyoxy/ethylene stearylamine in Example 1 was replaced with glycerin. The measured value of this product using a spread meter was 6(]o++.

Example 2 Carmine 6B 10 parts Precipitated barium sulfate 15 parts Rosin modified maleic acid resin 15 parts Diethylethanolamine
5 parts ethylene glycol 7 parts triethylene glycol 50 parts polyquine ethylene oleylamine 3 parts water
15 parts After premixing the above ingredients in a lab mixer for 1 hour,
The mixture was passed through a five-roll mill twice to obtain a red water-based printing ink. The measured value of this product using a spread meter was 62 rtrm.

Comparative Example 2 A red aqueous print ink composition was obtained in the same manner as in Example 2, except that 3 parts of polyoxyethylene oleylamine in Example 2 was replaced with ethylene glycol. The measured value of this product using a spread meter was 63 mm.

Comparative example & Commercially available oil-based printing ink (black).

The value measured by the spread meter is 65rm.

Comparative example 4゜ Commercially available water-based printing ink (black).

The measured value with a splenometer is between 58 and 58.

(Effects) Seven tests were conducted on the above Examples 1 and 2 and Comparative Examples 1 to 4. The results are shown in the table.

0 Water resistance: After drying the works printed with each print ink, they were immersed in water to observe whether the print ink leaked into the water.

○: No outflow, bow outflow 0 Water removal property: Apply each print ink to the back of the hand, leave it for 5 minutes, and then rub the area under running tap water 5 times with a load of about 500 g.

Observing how the print ink falls off ◎: Completely falls ○: Completely falls Δ: Slightly remaining It is an excellent material that has excellent properties such as excellent elasticity, toughness, and water-removal properties.

2. Although the present invention has been described above as an aqueous print ink composition, water was further added to the aqueous print ink composition obtained in the above-mentioned Examples.

By creating a viscosity that is easy to apply with a brush.

Conventionally, this could only be obtained by using resin emulsions.
It can also be used as a water-resistant watercolor paint, and by appropriately selecting the pigment and extender pigment, it can be made into a water-resistant transparent or opaque watercolor paint.
This watercolor paint has the same water-repellent properties as traditional watercolor paints.

The work has excellent water resistance.

Claims (1)

[Scope of Claims] 1. An aqueous printing ink comprising at least a pigment, an alkali-soluble resin, an alkaline agent, and a high-boiling water-soluble organic solvent, characterized in that it contains polyoxyethylene alkylamine. Printmaking ink composition. 2. The viscosity of the water-based printing ink is 40 to 65 mm (J
2. The aqueous printing ink composition according to claim 1, wherein the aqueous printing ink composition has a value measured by a spread meter described in IS, K5701 printing ink test method.