JPH08157758A - Water-base ink for ink jet recording - Google Patents

Abstract

PURPOSE: To stabilize ink delivery with an ink jet printer at a high driving frequency by incorporating a pigment and an arom. bromine compd. into an ink. CONSTITUTION: This ink is prepd. by mixing 0.1-10wt.% pigment (e.g. carbon black), 0.01-10wt.% at least one arom. bromine compd. selected from among a diphenyl compd. of formula I (wherein 4<=x+y<=10), a diphenyl ether compd. of formula II (wherein 4<=x+y<=10), a diphenoxyethane compd. of formula III (wherein 4<=x+y<=10), and a polybromophenylene oxide compd. of formula IV (wherein 10<=n<=30), and 60-95wt.% water with a ball mill, etc. The pigment and the bromine compd. are mixed with each other in a wt. ratio of (1,000:1)-(1:2) and kneaded before being mixed with water to treat the surface of the pigment with this compd. Recording is carried out by thermal jet recording using thermal energy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-based ink for ink jet recording, and more specifically, a water-based ink for ink jet recording capable of realizing ejection stability at a high driving frequency of an ink jet printer and an ink jet using the same. It relates to a recording method.

[0002]

2. Description of the Related Art The ink jet recording system is a recording system in which characters and images are obtained by directly ejecting and adhering ink droplets from a very fine nozzle onto a recording member. According to this method, not only has the advantage that the device used is low in noise and has good operability, but it also has the advantage that plain color can be used and plain paper can be used as a recording member.
Widely used in recent years. As the ink ejection method,
A piezoelectric type using a piezoelectric element for a printer head and a thermal jet type using a heater for a heating resistance element are widely used as personal printers.

[0003]

In recent years, there has been a strong demand for high speed ink jet printers. The above demand for higher speed is usually dealt with by increasing the number of nozzles in the printer, or the ink is allowed to contain a specific polymer additive (Japanese Patent Laid-Open No. 1994887/1993),
It has been proposed to contain diethylene glycol monobutyl ether (JP-A-5-125309), but it is not sufficient.

Accordingly, it is an object of the present invention to provide an ink jet recording water-based ink capable of realizing ejection stability at a high driving frequency of an ink jet printer and an ink jet recording method using the same.

[0005]

As a result of earnest research, the inventors of the present invention can achieve the above object by using a pigment and an aromatic bromine compound in combination in a water-based ink for ink jet recording. The present invention has been completed and the present invention has been completed.

That is, the present invention provides a water-based ink for ink jet recording which is characterized by containing a pigment and an aromatic bromine compound.

Further, the present invention provides an ink jet recording method using the above water base ink for ink jet recording of the present invention, wherein thermal ink is used to record the above water base ink for ink jet recording as ink droplets from a nozzle. The present invention provides an inkjet recording method characterized in that a member is discharged to perform recording.

The aqueous ink for ink jet recording of the present invention will be described in detail below.

In the water-based ink for ink jet recording of the present invention, it is not always clear why ejection stability at a high driving frequency of an ink jet printer can be realized by including a pigment and an aromatic bromine compound in the ink. However, it is considered as follows. That is, bromine substituted in the aromatic ring has a small frequency dependence,
Therefore, it is considered that ejection is stable in a wide range from low frequency to high frequency. As described above, in the present invention, by using the pigment and the aromatic bromine-based compound in combination, excellent effects that cannot be obtained by the conventional inkjet ink are exhibited.

Examples of the aromatic bromine-based compound contained in the water-based ink for ink jet recording of the present invention include:
Preferable examples include compounds represented by the following (I) [diphenyl type], (II) [diphenyl ether type], (III) [diphenoxyethane type] and (IV) [polydibromophenylene oxide type].

[0011]

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[0012]

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[0013]

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[0014]

[Chemical 4]

In the present invention, the above aromatic bromine compounds may be used alone or in combination of two or more. The aromatic bromine-based compound used in the present invention can be obtained from Bromochem Far East Co., Ltd., Great Lake Chemical Co., Ltd., Ethyl Co., etc.,
For example, 102E (decabromodiphenyl ether),
120 (tetradecabromodiphenoxybenzene), R
B-100 (tetrabromobisphenol) or the like can be used.

Any pigment can be used as the pigment to be contained in the water-based ink for ink jet recording of the present invention. For example, carbon black; C.I. I.
Pigment Yellow 1, 5, 12, 14, 17, 2
4, 42, 53, 83, 95, 97, 98 and 100;
C. I. Pigment Red 1, 3, 4, 5, 17, 2
2, 31, 48, 49, 53, 63, 64, 88 and 1
01; C.I. I. Pigment Blue 1, 15, 16, 2
7, 28, 29, 56, 60 and 63; C.I. I. Pigment Black 1, 7 and 11; and the like can be used. The blending amount is not particularly limited, but 0.5 to 10% by weight is optimal.

Further, in the present invention, a dispersant generally used for further improving the dispersibility of the pigment may be added.

The water-based ink for ink-jet recording of the present invention contains water as a medium, contains a pigment and an aromatic bromine compound, and includes various conventionally known additives such as wetting agents such as polyhydric alcohols. , A fungicide and / or a chelating agent may be further added. Examples of the wetting agent include polyhydric alcohols such as ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, glycerin, diethylene glycol diethyl ether, and diethylene glycol mono-n-butyl ether, and their ethers, acetates, N-
One or more nitrogen-containing compounds such as methyl-2-pyrrolidone and 1,3-dimethylimidazolidinone can be used.

The composition of the water-based ink for ink jet recording of the present invention is not particularly limited, but generally 0.1 to 10% by weight of the pigment and 0.01 to 10% of the aromatic bromine compound are based on the total weight of the ink. 10% by weight, 60 to 95% by weight of water, 2 to 40% by weight of other components, preferably 0.5 to 5% by weight of pigment and 0.1 to 5% by weight of aromatic bromine compound. , 70 to 90% by weight of water and 5 to 30% by weight of other components. The weight ratio of the pigment to the aromatic bromine compound is generally 1000: 1 to 1: 2, preferably 100: 1 to 1: 1.

There is no particular limitation on the method for preparing the water base ink for ink jet recording of the present invention by mixing the above respective components, and a conventionally known apparatus such as a ball mill, a sand mill, an attritor, a basket mill or a roll mill is used. Can be mixed. In preparing the ink of the present invention, it is preferable to surface-treat the pigment with an aromatic bromine compound. The method of surface treatment in this case is not particularly limited, but it is desirable to knead the pigment and the aromatic bromine compound and knead the aromatic bromine compound into the pigment before preparing the ink. For example, it is possible to obtain a surface-treated product by adding only a pigment and an aromatic bromine compound or a small amount of water thereto and heat-treating with a kneader. By carrying out such a treatment, the surface of the pigment is sufficiently covered with the aromatic bromine compound, and is further protected from heat.

The water base ink for ink jet recording of the present invention can be used in any printer as long as it uses an ink jet recording system. For example, a printer of a piezoelectric recording method using a piezoelectric element in a printer head and The printer head can be used in any printer of a thermal jet recording method that uses heat energy of a heater of a heating resistance element or the like.
In particular, the ink jet recording ink of the present invention is preferably used in a thermal jet recording method in which thermal energy is used to eject ink droplets from a nozzle onto a recording member to perform recording, and the thermal energy is heat resistance. The element heater is preferably used.

[0022]

EXAMPLES The effectiveness of the present invention will be illustrated by the following examples, but the present invention is not limited to these examples. In the following examples, parts represent parts by weight unless otherwise specified.

[Example 1] carbon black; 5 parts; compound represented by the following (V); 5 parts; diethylene glycol; 5 parts; water; 85 parts

[0024]

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The above carbon black, the compound represented by (V) and 5 parts of water were heated to 60 ° C. with a kneader and kneaded for 2 hours, and then the kneaded product, diethylene glycol and the remaining water were rolled in three roll mills. Was mixed and dispersed for 2 hours to prepare a paint. The resulting dispersion was filtered through a 5 micron filter to remove dust and coarse particles to obtain an ink. Using this ink, printing was performed at a frequency of 3 KHz and 10 KHz on a thermal jet (BJ-10VLite made by Canon) using a heater of a heating resistance element, and the results shown in Table 1 were obtained. In Table 1, the frequency dependence was printed at frequencies of 3 KHz and 10 KHz, and the size of the droplet was measured with a microscope.

[Example 2] C. I. Pigment Red 3; 5 parts; Compound represented by the following (VI); 5 parts; Glycerin; 4 parts; Water; 86 parts

[0027]

[Chemical 6]

The above components were made into paint by the same manufacturing method as in Example 1. The resulting dispersion was filtered through a 5 micron filter to remove dust and coarse particles to obtain an ink. Using this ink, printing was performed at frequencies of 3 KHz and 10 KHz in the same manner as in Example 1, and Table 1
The result is shown in.

[Embodiment 3] C. I. Pigment Blue 15; 5 parts ・ Compound represented by the following (VII): 5 parts ・ Diethylene glycol: 5 parts ・ Water: 85 parts

[0030]

[Chemical 7]

The above components were made into paint by the same manufacturing method as in Example 1. The resulting dispersion was filtered through a 5 micron filter to remove dust and coarse particles to obtain an ink. Using this ink, printing was performed at frequencies of 3 KHz and 10 KHz in the same manner as in Example 1, and Table 1
The result is shown in.

Comparative Example C. I. Pigment Red 3; 5 parts; phthalic anhydride; 5 parts; glycerin; 4 parts; water; 86 parts The above components were made into a paint by the same production method as in Example 1. The resulting dispersion was filtered through a 5 micron filter to remove dust and coarse particles to obtain an ink. Using this ink, printing was performed at frequencies of 3 KHz and 10 KHz in the same manner as in Example 1, and the results shown in Table 1 were obtained.

[0033]

[Table 1]

As is clear from the results shown in Table 1, the water base ink for ink jet recording of the present invention has realized a water base ink for ink jet recording capable of realizing ejection stability with respect to a high driving frequency. To the end. In particular, the ink jet recording water-based ink of the present invention exhibits excellent effects when printed using a thermal jet ink jet printer.

[0035]

According to the present invention, there is provided an inkjet recording water-based ink capable of realizing ejection stability at a high driving frequency of an inkjet printer, and an inkjet recording method using the same. Further, according to the present invention,
In particular, when it is used in a thermal jet system utilizing heat energy of a heater of a heating resistance element or the like, stable ejection can be obtained even when printing is performed at a high frequency of 10 KHz.

Claims (4)

[Claims] 1. A water-based ink for ink-jet recording comprising a pigment and an aromatic bromine compound. 2. The water-based ink for ink-jet recording according to claim 1, wherein the pigment is surface-treated with the aromatic bromine-based compound. 3. An ink jet recording method, wherein thermal ink is used to eject the aqueous ink for ink jet recording according to claim 1 or 2 as an ink droplet from a nozzle to a recording member to perform recording. . 4. The ink jet recording method according to claim 3, wherein a heater of a heating resistance element is used as the heat energy.