JPH03223373A - Ink composition for wood printing - Google Patents

Abstract

PURPOSE:To obtain an ink composition for wood printing which comprises at least a pigment, an alkali-soluble resin and a high boiling water-soluble organic solvent and exhibits good slow-drying property on the non-absorbing side by further incorporating a specific compound. CONSTITUTION:A water-soluble polyoxyethylene glycerine aliphatic acid ester (e.g. Adekanol NK-10 manufactured by Asahi Denka Kogyo K.K.) is incorporated in an ink composition which comprises at least a pigment (e.g. carbon black), an alkali-soluble resin (e.g. rosin-modified maleic acid resin) and a high boiling water-soluble organic solvent (e.g. triethylene glycol).

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a printing ink composition, and more particularly to a printing ink composition that has excellent slow drying properties on non-absorbing surfaces.

(Prior art) Conventionally, printing inks have been oil-based or neutral (water-in-oil emulsion), but oil-based inks have odor and toxicity, and neutral emulsions have instability. Therefore, in recent years, pigments, alkali-soluble resins,
Water-based printing inks containing high-boiling point water-soluble organic solvents as main components have come into use.

(Problem to be Solved by the Invention) However, since the printing ink dries quickly, when it is used, the printing ink is spread on a non-absorbing surface such as a kneading board using a roller, etc., and transferred to a printing block quickly. There was a problem in that it required a lot of work and was particularly difficult for lower grade children to handle.

This "drying on the non-absorbing surface" can be prevented by increasing the proportion of the high-boiling water-soluble organic solvent in the printing ink.

However, when the proportion of high-boiling water-soluble organic solvents is increased, there are problems such as slow drying of the printed prints and the tendency for bleeding to occur on the prints, which prevents "drying on non-absorbent surfaces". At the same time, no solution has been found that does not cause the above-mentioned "decrease in the dryness of prints" and "bleeding of prints".

(Means for Solving the Problems) In view of the above-mentioned problems, the present invention provides a printmaking ink composition that prevents "drying on non-absorbing surfaces" and that does not reduce the drying properties of printworks or cause bleeding of printworks. A printing ink which is intended for the purpose of obtaining a product and is composed of at least a pigment, an alkali-soluble resin, and a high-boiling water-soluble organic solvent, and further contains a water-soluble polyoxyethylene glycerin fatty acid ester. The gist of this invention is a printing ink composition characterized by the following.

This will be explained in detail below.

The pigment is used as a coloring agent, and various conventionally known inorganic and organic pigments can be used. Specifically, carbon black, titanium oxide, red iron oxide, cadmium red, lake red, carmine 3B, carmine 6B, ocher, barium yellow, Hansa yellow, carmine 10G, navy blue, ultramarine, burnt schenna, phthalocyanine blue, phthalocyanine green, etc. They can be used either singly or in combination, and the amount used is preferably 3 to 25% by weight based on the total amount of the printing ink composition.

Alkali-soluble resins are used as fixing agents and coloring agents for the above pigments, and specifically include (meth)acrylic resins, styrene-acrylic resins, styrene-maleic acid resins, maleic acid resins, and fumaric acid resins. Acid resins, rosin-modified maleic acid resins, etc. can be used, and the amount used is preferably 5 to 20% by weight based on the total amount of the printing ink composition.

The high-boiling water-soluble organic solvent is used as an anti-drying agent for the printing ink composition on a non-absorbing surface such as a mixing board. Specifically, glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, and dipropylene glycol, triethanolamine, glycerin, benzyl alcohol, etc. can be used alone or in combination, and the amount used is It is preferably 10 to 40% by weight based on the total amount of the printing ink composition.

The water-soluble polyoxyethylene glycerin fatty acid ester, which is the mainstay of the present invention, is used as an inhibitor for "drying on non-absorbing surfaces" and is obtained by addition polymerizing ethylene oxide to the free hydroxyl groups of monofatty acid glycerin. It is something that can be done. As the fatty acid, those using stearic acid or oleic acid are preferred. In order to be water-soluble, it is necessary to adjust the number of carbon atoms in the fatty acid and the number of moles of addition polymerization of ethylene oxide, but it is particularly good if the HLB is 10 or more. Specific examples of water-soluble polyoxyethylene glycerin fatty acid esters include ADEKANOL NK-10, ADEKANOL NK-15, and ADEKANOL NK-20 (all of which are Kadenka Kogyo Co., Ltd.
, Emmalex GWIS-305 (Japan Emulsion■
), Niracol TMGO-15, Niracol TMGS-15 (
(manufactured by Nippon Surfactant Kogyo), Poem S-1
20, ○-120 (manufactured by Riken Vitamin ■), etc., and the amount used is 0 based on the total amount of the printing ink composition.
．． 5 to 5% by weight is preferred. Here, HLB is a numerical expression of the balance between hydrophilicity and lipophilicity, and in the case of nonionic surfactants (HLB = weight % of hydrophilic groups
115).

In addition to the above ingredients, if necessary, extender pigments such as calcium carbonate and barium sulfate, water-soluble polymers such as hydroxyethyl cellulose and hydroxypropyl cellulose, preservatives and fungicides, and interfaces such as sodium alkylbenzenesulfonate, etc. Additives such as activators and solubilizers such as lower aliphatic alcohols may be used as appropriate.

Further, the printing ink composition of the present invention can be easily obtained by various conventionally known methods such as mixing and dispersing the above components in a dispersing machine such as a three-roll mill or a horizontal ball mill.

(Function) The water-soluble polyoxyethylene glycerin fatty acid ester used in the printing ink composition of the present invention has a high boiling point and high water retention, so it not only does not evaporate easily, but also evaporates easily from the solvent. Since it has the effect of suppressing evaporation, it is presumed that it greatly suppresses the drying of printing ink on the non-absorbing surface. Furthermore, since this printmaking ink does not have an increased proportion of high-boiling point water-soluble organic solvents, it does not cause bleeding in the printwork.

(Examples) Hereinafter, the present invention will be explained in more detail with reference to Examples. "Parts" indicate "parts by weight."

Oomizo 1-yo- Force-bon black 1 part precipitated barium sulfate 20 parts rosin-modified maleic acid resin 15 parts dimethylethanolamine 5 parts glycerin
7 parts triethylene glycol 27
Part Isopropyl Alcohol 5 Part Hydroxypropyl Cellulose 0.5 Part Adekanol N
K-103 parts (HLB: ] 1.2) Water
8.5 parts of the listed ingredients were placed in a lab mixer, premixed for 1 hour, and passed through twice in a three-roll mill to obtain a black print ink composition.

η-Example-I Carmine 6B 5 parts Precipitated barium sulfate 20 parts Rosin modified maleic acid resin 15 parts Dimethylethanolamine 5 parts Triethanolamine
3 parts ethylene glycol 1
9.5 parts Triethylene glycol 21 parts Adekanol NK-203 parts (HLB: 14.4) Water
9 parts A red printing ink composition was obtained using the above ingredients in the same manner as in Example 1.

Disaster analysis carbon black 10 parts precipitated barium sulfate 20 parts rosin modified maleic acid resin 15 parts dimethylethanolamine 5 parts glycerin
7 parts dipropylene glycol 28 parts inpropyl alcohol 5 parts hydroxypropyl cellulose 0.5 parts Ninocol TMG
O-15 3 parts (HLB: 14.5) Water
9.5 parts A black printing ink was obtained using the above ingredients in the same manner as in Example 1.

dog! i1.4- Carmine 6B 5 parts Precipitated barium sulfate 25 parts Rosin modified maleic acid resin 15 parts Dimethylethanolamine 5 parts Ethylene glycol
10 parts triethylene glycol
20 parts Triethanolamine 3 parts Isopropyl alcohol 5 parts Hydroxyethylcellulose 0.5 parts Dinocol TMG
S-153 parts (HLB: 13.5) Water
9.5 parts A red printing ink was obtained using the above ingredients in the same manner as in Example 1.

Phthalocyanine blue - 5 parts precipitated barium sulfate 25 parts fumaric acid resin
15 parts dimethylethanolamine 5 parts glycerin
7 parts dipropylene glycol 28 parts isopropyl alcohol 5 parts hydroxypropyl cellulose 0.5 parts Poem S-120
Part 3 (HLB: 14.3) Wednesday 9
．． 5 parts A blue printing ink was obtained using the above ingredients in the same manner as in Example 1.

Shigohandan Hansa Yellow 10G 5 parts Precipitated barium sulfate 25 parts Styrene-maleic acid resin 15 parts Dimethylethanolamine 5 parts Ethylene glycol
10 parts triethylene glycol 2
0 parts triethanolamine 3 parts isopropyl alcohol 5 parts hydroxyethyl cellulose 0.5 parts Poem 0-120
Part 3 (HLB: 14.3) Wednesday 9
．． 5 parts A yellow printing ink was obtained using the above ingredients in the same manner as in Example 1.

A black printing ink was obtained in the same manner as in Example 1, except that Adekanol NK-10 was removed from the ingredients in Example 1 and triethylene glycol was added accordingly.

(Effects) Tests were conducted on the printing inks obtained in Examples 1 to 6 and Comparative Example 1 above.

The results are shown in Table 1.

(Hereinafter, blank space) It was applied to a thickness of 0.076 mm on a board, left to stand at room temperature (25° C.), and the time until drying was measured with a touch finger.

Note 2) Drying time for prints: Each print ink was printed on Japanese paper for prints using a woodblock, and the same Japanese paper was stacked with a load of 500 g, and the time until the ink stopped transferring to the paper was measured.

Furthermore, all of the print works using the print ink compositions obtained in Examples 1 to 6 had no bleeding and had good quality.

As explained in detail above, the print ink composition according to the present invention has a long "non-absorbing surface drying time" and is excellent in handling properties, and can be used as other print inks to prevent printing ink from bleeding. It also has excellent properties.

Moreover, it goes without saying that the present invention can be used not only as an ink for printing but also as a regular paint.

Claims (1)

[Claims] A printmaking ink composition comprising at least a pigment, an alkali-soluble resin, and a high-boiling water-soluble organic solvent, further comprising a water-soluble polyoxyethylene glycerin fatty acid ester.