JPH073195A - Inkjet recording ink - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a recording ink which has good drying property even on plain paper, has little bleeding, and has little image bleeding at the boundary at the time of color superimposition, and is capable of color printing. An ink for ink jet recording comprising sodium alginate and a surfactant represented by the following structural formula (I). [Chemical 1]

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording ink, and more particularly to an ink jet recording ink capable of forming a clear image on plain paper.

[0002]

2. Description of the Related Art In recent years, ink jet printers have been
It is popular because of its advantages such as low cost and low power consumption. Further, an inkjet printer capable of full-color recording has been put into practical use by performing overprinting using a plurality of color inks, for example, cyan, magenta, and yellow inks. However, when so-called plain paper such as electrophotographic paper, bond paper, and stock form paper is used as the recording paper,
Image blurring may occur. Further, in an image obtained by superimposing inks of a plurality of colors, bleeding may occur at the boundary between inks (this phenomenon is referred to as boundary bleeding hereinafter). The former bleeding phenomenon is
It occurs when the ink penetrates into the recording paper, but simply lowering the permeability of the ink into the recording paper deteriorates the drying property of the ink, and when the recording paper after printing is rubbed with a finger etc., the image shifts. Occurs. The latter phenomenon of boundary bleeding is considerably improved if the previously printed ink is completely dried and the next ink is overprinted, but it slows down the overall recording speed. Simply increasing the penetrability of the ink into the recording paper to improve the drying property does not produce a very large effect, and causes bleeding.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an ink jet recording ink which has good drying property even on plain paper and can be recorded with little bleeding or boundary bleeding during color overlapping. is there.

[0004]

SUMMARY OF THE INVENTION The present invention provides an ink jet recording ink containing sodium alginate and a surfactant represented by the following structural formula (I).

[Chemical 1] The amount of sodium alginate added was 0.
It is preferable to set it to 01% by weight or more.

As the colorant used in the present invention, various water-soluble dyes are used. Specific examples include the following. C. l. Acid Yellow 17, 23,
42, 44, 79, 142; C.I. l. Acid red
1, 8, 13, 14, 18, 26, 27, 35, 37,
42, 52, 82, 87, 89, 92, 97, 106,
11l, 114, 115, 134, 186, 249, 2
54,289; C.I. l. Acid Blue 9, 29, 4
5, 92, 249; C.I. l. I Acid Black l,
2, 7, 24, 26, 94; C.I. l. Hood yellow
3, 4; C.I. l. Hood Red 7, 9, 14; C.I.
l. Food Black 1, 2; C.I. l. Direct Yellow 1, 12, 24, 26, 33, 44, 50, 1
20, 132, 142, 144; C.I. l. Direct Red 1, 4, 9, 13, 17, 20, 28, 31, 3
9, 80, 81, 83, 89, 225, 227; C.I.
l. Direct Orange 26, 29, 62, 102;
C. l. Direct Blue 1, 2, 6, 15, 22,
25, 71, 76, 79, 86, 87, 90, 98, 1
63, 165, 199, 202, C.I. l. Direct Black 19, 22, 32, 38, 51, 56, 71,
74, 75, 77, 154, 168, 171; C.I. l.
Basic Yellow 1, 2, 11, 13, 14, 1
5, 19, 21, 23, 24, 25, 28, 29, 3
2, 36, 40, 41, 45, 49, 51, 53, 6
3, 67, 70, 73, 77, 87, 91; C.I. l. Basic Red 2, 12, 13, 14, 15, 18,
22, 23, 24, 27, 29, 35, 36, 38, 3
9, 46, 49, 51, 52, 54, 59, 68, 6
9, 70, 73, 78, 82, 102, 104, 10
9, 112; C.I. l. Basic Blue 1, 3, 5,
7, 9, 21, 22, 26, 35, 41, 45, 47,
54, 62, 65, 66, 67, 69, 75, 77, 7
8, 89, 92, 93, 105, 117, 120, 12
2,124,129,137,141,147,15
5; C.I. l. Basic Black 2, 8; C.I. l. Reactive Yellow 1, 5, 11, 13, 14, 20,
21, 22, 25, 40, 47, 51, 55, 65, 6
7; C.I. l. Reactive Red 1, 14, 17, 2
5, 26, 32, 37, 44, 46, 55, 60, 6
6, 74, 79, 96, 97; C.I. l. Reactive Blue 1, 2, 7, 14, 15, 23, 32, 35, 3
8, 41, 63, 80, 95; C.I. l. Reactive Black 3, 4, 7, 11, 12, 17 etc. These may be used alone or in combination of two or more. The content of these colorants in the ink is preferably 0.1 to 10% by weight, more preferably 1 to 5% by weight.

When used as a color ink jet recording ink using two or more colors of ink, it is necessary that at least one color of ink contains sodium alginate and a surfactant of the structural formula (I). The sodium content is preferably 0.3% by weight or more.

Various water-soluble organic solvents can be used as a wetting agent to prevent clogging at the nozzle of an ink jet printer or as a dissolution stabilizer for ink components. Specifically, polyhydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, polypropylene glycol, glycerol, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monoethyl ether. Polyhydric alcohol alkyl ethers such as butyl ether, tetraethylene glycol monomethyl ether and propylene glycol monoethyl ether, polyhydric alcohol aryl ethers such as ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether, N-methyl-2-virolidone , N-hydroxyethyl-2-pyrrolidone, , 3-Dimethylimidazolidinone, ε-caprolactam, nitrogen-containing heterocyclic compounds such as γ-butyrolactone, amides such as formamide, N-methylformamide, N, N-dimethylformamide, monoethanolamine, diethanolamine, triethanol Amines, amines such as monoethylamine, diethylamine and triethylamine, sulfur-containing compounds such as dimethylsulfoxide, sulfolane and thiodiethanol, propylene carbonate and ethylene carbonate are used alone or in combination. The content of these water-soluble organic solvents in the ink is preferably 1 to 4
It is 0% by weight, more preferably 5 to 20% by weight.

Various penetrants can be used to adjust the surface tension. For example, alkyl and aryl ethers of polyhydric alcohols such as ethylene glycol monophenyl ether, diethylene glycol monophenyl ether, ethylene glycol monoallyl ether, diethylene glycol monobutyl ether, propylene glycol monobutyl ether, and tetraethylene glycol chlorophenyl ether, fluorine-based surfactants. , Lower alcohols such as ethanol and 2-propanol may be used alone or in combination. The content of these penetrants in the ink is preferably 0.5 to 5
%, More preferably 0.5 to 2% by weight.

In the present invention, in the case of a color ink jet recording ink using two or more colors of ink, it is desirable that at least one color ink contains the sodium alginate of the present invention and a surfactant. Other various antiseptics, antifungal agents, pH adjusters, rust preventives, ultraviolet absorbers and infrared absorbers may be added as required.

[0010]

EXAMPLES The present invention will be specifically described below with reference to examples. In addition, the amount of each component described in the examples is based on weight. Example 1 Cyan ink composition Sodium alginate 0.01% C.I. I. Direct Blue 199 1.50% Diethylene glycol 7.50% Glycerol 2.50% BT-12 (Nikko Chemical Co. structural formula (I) surfactant) 1.00% Ion-exchanged water Remaining magenta ink composition Sodium alginate 0.01% C.I. I. Direct Red 227 1.30% Diethylene glycol 7.50% Glycerol 2.50% BT-12 1.00% Ion-exchanged water Remaining amount Yellow ink composition Sodium alginate 0.01% C.I. I. Direct Yellow 132 1.00% Diethylene glycol 7.50% Glycerol 2.50% BT-12 1.00% Ion-exchanged water Remaining amount of each of the above formulations is thoroughly stirred and dissolved, filtered through a 0.45 μm Teflon filter, and cyan ink. , Magenta ink and yellow ink were prepared respectively.

Example 2 Three-color inks were prepared in the same manner as in Example 1 except that sodium alginate was changed to 0.02%.

Example 3 Three-color inks were prepared in the same manner as in Example 1 except that sodium alginate was changed to 0.05%.

Example 4 Three-color inks were prepared in the same manner as in Example 1 except that sodium alginate was changed to 0.10%.

Example 5 Three-color inks were prepared in the same manner as in Example 1 except that sodium alginate was changed to 0.20%.

Comparative Example 1 Ink composition Cyan ink composition Sodium alginate 0.01% C.I. I. Direct Blue 199 1.50% Diethylene glycol 7.50% Glycerol 2.50% BT-7 (surfactant manufactured by Nikko Chemical Co., Ltd.) 1.00% Ion-exchanged water Remaining magenta ink composition Sodium alginate 0.01% C.I. I. Direct Red 227 1.30% Diethylene glycol 7.50% Glycerol 2.50% BT-7 1.00% Ion-exchanged water Remaining amount Yellow ink composition Sodium alginate 0.01% C.I. I. Direct Yellow 132 1.00% Diethylene Glycol 7.50% Glycerol 2.50% BT-7 1.00% Ion-exchanged water Remaining amount of each of the above formulations was thoroughly stirred and dissolved, filtered through a 0.45 μm Teflon filter, and cyan ink. , Magenta ink and yellow ink were prepared respectively.

Comparative Example 2 Three-color inks were prepared in the same manner as in Comparative Example 1 except that sodium alginate was changed to 0.02%.

A printing test was carried out with a full color ink jet printer using the inks of the above Examples and Comparative Examples, and the results of visual evaluation of the printed images are shown in Table 1. The evaluation was made by a 10-point method, and the higher the drying property, the less the bleeding, and the less the boundary bleeding, the higher the score.

[Table 1] It was confirmed that the ink of the present invention bleeds less than the ink of the comparative example and has less bleeding at the boundary.

The ink for ink jet recording according to the present invention containing sodium alginate and a specific surfactant has a good drying property even on plain paper, and enables recording with less bleeding and boundary bleeding.

Claims (1)

[Claims] 1. An ink for ink jet recording comprising sodium alginate and a surfactant represented by the following structural formula (I). [Chemical 1]