JPH06192604A - Recording fluid - Google Patents

Abstract

PURPOSE:To obtain a black recording fluid which gives a high-quality printing and a high-density record image even when used for recording on a plain paper, is excellent in resistances to water and light, and has a good long-storage stability by compounding a specific black dye into the fluid. CONSTITUTION:A recording fluid contains an aq. medium and at least one member selected from dyes represented by formula I (wherein A is an optionally substd. phenyl or naphthyl group; B is an optionally substd. phenylene or naphthylene group; R is H or an optionally substd. alkyl group; M is an alkali metal, an ammonium group, or an org. amine group; and n is 0 or 1). The fluid may contain various additives; for instance, the addition of 0.1-10wt.% (based on the whole fluid) urea, thiourea, biuret, or semicarbazide or 0.001-5.0wt.% (based on the whole fluid) surfactant further improves the drying speed and printing quality.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a recording liquid. Specifically, it relates to a recording liquid suitable for inkjet recording.

[0002]

2. Description of the Related Art A so-called ink jet recording method has been put into practical use in which a recording liquid droplet containing a water-soluble dye such as a direct dye or an acid dye is ejected from a minute ejection orifice to perform recording. Regarding the solvent of this recording liquid, it is fast to fix to recording papers that are commonly used for general office work such as PPC (plain paper copier) paper such as electrophotographic paper and fan hold paper (continuous paper such as computers), and the printing quality is high. Is required, that is, the print has no blur and the contour is clear, and the stability during storage is also required, and the usable solvent is significantly limited.

On the other hand, dyes for recording liquids have sufficient solubility in the above-mentioned limited solvents, are stable even when stored for a long period of time, and have a density of printed images. It is required to have high water resistance and excellent light resistance and light resistance, but it is difficult to satisfy many of these requirements at the same time. Therefore, various methods (for example, JP-A-55-144067 and JP-A-55-152) are used.
747, JP-A-57-207660, JP-A-58-
147470, JP-A-62-190269, JP-A-62-190271, JP-A-62-190272,
JP-A-62-250082, JP-A-62-24697
5, JP-A-62-257971, JP-A-62-28
8659, JP-A-63-8463, JP-A-63-2
2867, JP-A-63-22874, JP-A-63-
30567, JP-A-63-33484, JP-A-63.
-63764, JP-A-63-105079, JP-A-64-31877, JP-A-1-93389, JP-A1-2104464, JP-A-2-140270, JP-A-3-167270, JP-A-3-167270. 3-200882)
Has been proposed, but has not yet fully satisfied the market demand for performance.

[0004]

DISCLOSURE OF THE INVENTION The present invention has good print quality even when recorded on plain paper for ink jet recording, writing instruments, etc., and has a high density of recorded images, which is excellent in water resistance and light resistance. It is an object of the present invention to provide a black recording liquid which is excellent in stability and has good stability when stored for a long period of time.

[0005]

Means for Solving the Problems The inventors of the present invention have made earnest studies to achieve the above object, and as a result, the above object is achieved when a specific black dye is used as a recording liquid component. It was confirmed that the present invention was achieved. That is, the gist of the present invention is to use an aqueous medium and the following general formula (1).

[0006]

[Chemical 2] (In the formula, A and B each represent a phenyl group which may have a substituent, a naphthyl group, a phenylene group or a naphthylene group, R represents a hydrogen atom or an optionally substituted alkyl group, and M represents A recording liquid containing an alkali metal, an ammonium group or an organic amine, and n representing at least one of the dyes represented by 0).

The present invention will be described in detail below. The present invention is based on the use of the dye of the formula (1) as a coloring component of the recording liquid.

Explaining the substituent of the formula (1), A
And a substituent of the phenyl group, naphthyl group or phenylene group and naphthylene group represented by B, is a —SO ₃ M group,
-COOM group, amino group, acylamino group (for example, acetylamino group, propionylamino group, benzoylamino group), linear or branched alkoxy group having 1 to 4 carbon atoms, hydroxyl group, halogen atom, linear or Examples thereof include branched chain alkyl groups having 1 to 4 carbon atoms, which may have plural substituents. Examples of the optionally substituted alkyl group represented by R include a linear or branched alkyl group having 1 to 8 carbon atoms and 1 to 4 carbon atoms.
And a hydroxyalkyl group, an alkyl group having 1 to 3 carbon atoms substituted with a -COOM group, an alkoxyalkyl group having 1 to 8 carbon atoms, and the like. Examples of the organic amine represented by M include a lower alkylamine, a hydroxy-substituted lower alkylamine, a carboxy-substituted lower alkylamine, and an alkyleneimine unit having 2 to 4 carbon atoms in an amount of 2 to 1
Examples thereof include polyamines having 0 or the like. Specific examples of the dye represented by the formula (1) include, for example, the following (a) to
An azo dye having a structure shown in (o) can be mentioned.

[0009]

[Chemical 3]

[0010]

[Chemical 4]

[0011]

[Chemical 5]

The azo dye represented by the formula (1) is a method known per se [for example, "New dye chemistry" by Yutaka Hosoda (Showa 4).
Pp. 396-409, published by Gihodo on December 21, 8], and can be produced through the diazotization and coupling steps. The content of the dye of formula (1) in the recording liquid is preferably 0.5 to 8% by weight, particularly preferably 2 to 5% by weight, based on the total amount of the recording liquid.

The solvent used in the recording liquid of the present invention includes water and water-soluble organic solvents such as ethylene glycol, propylene glycol, butylene glycol,
Diethylene glycol, triethylene glycol, polyethylene glycol (# 200), polyethylene glycol (# 400), glycerin, α-pyrrolidone, N-
Methyl-pyrrolidone, N-ethyl-pyrrolidone, 1,3
-Contains dimethyl-imidazolidinone, ethylene glycol monoallyl ether, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, bis (β-hydroxyethyl) thioether, dimethyl sulfoxide, dimethylformamide, diethanolamine, triethanolamine, isopropanol, etc. Is preferred. These water-soluble organic solvents are usually used in the range of 1 to 50% by weight based on the total amount of the recording liquid. On the other hand, water is used in the range of 45 to 95% by weight with respect to the total amount of the recording liquid.

Various additives can be used in combination with the recording liquid of the present invention. For example, 0.1 for the total amount of recording liquid
10 to 10% by weight, preferably 0.5 to 5% by weight, of a compound selected from urea, thiourea, biuret and semicarbazide, or 0.001 to 5.0% by weight of a surfactant is added. Thereby, the quick drying property after printing and the printing quality can be further improved.

[0015]

EXAMPLES The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples unless it exceeds the gist.

Example 1

[Table 1]

The respective components described above were thoroughly mixed and dissolved, pressure-filtered with a Teflon filter having a pore size of 1 μm, and then deaerated with a vacuum pump and an ultrasonic cleaner to prepare a recording liquid. Using the obtained recording liquid, inkjet recording was carried out on an electrophotographic paper (manufactured by Fuji Xerox Co., Ltd.) by using an inkjet printer (manufactured by HG-3000 Epson Corp.) to obtain a black recorded matter having a high color density. In addition, the following (a),
The result of having performed various evaluations by the method of (b) and (c) is shown.

(A) Light resistance of recorded image: A xenon fade meter (manufactured by Suga Test Instruments Co., Ltd.) was used to measure 100 on recording paper.
Irradiated for an hour. The discoloration and fading after irradiation was small. (B) Water resistance of recorded image: The bleeding of the image was examined after the recording paper was immersed in water for 5 minutes. Image blur is slight,
Also, the decrease in concentration was small. (C) Storage stability of recording liquid: The recording liquid was sealed in a Teflon container and examined for changes after storage at 5 ° C and 60 ° C for 1 month. No precipitation of insoluble matter was observed.

Example 2

[Table 2]

Recording liquids were prepared by treating each of the above components by the method described in Example 1, recording was performed, and various evaluations according to (a) to (c) of Example 1 were performed. As a result, good results were obtained as in the case of Example 1.

Example 3

[Table 3]

The above components were treated by the method described in Example 1 to prepare a recording liquid, recording was carried out, and various evaluations according to (a) to (c) of Example 1 were carried out. As a result, as in Example 1, good results were obtained.

Examples 4 to 12 Instead of the dye of the above formula (a) used in Example 1,
A recording liquid was prepared and recorded by the method of Example 1 except that the dyes of the above formulas (d) to (wo) were used, and various evaluations according to (a) to (c) of Example 1 were performed. I did. As a result, as in Example 1, good results were obtained.

[0024]

INDUSTRIAL APPLICABILITY The recording liquid of the present invention is used for ink jet recording and writing instruments, and when recorded on plain paper, a recorded matter of high color density with excellent print quality is obtained, and the light resistance of recorded images is improved. In addition to excellent water resistance, it also has good storage stability as a recording liquid.

Claims (1)

[Claims] 1. An aqueous medium and the following general formula (1): (In the formula, A represents a phenyl group or a naphthyl group which may have a substituent, B represents a phenylene group or a naphthylene group which may have a substituent, and R represents a hydrogen atom or a substituted group. Is an alkyl group, M is an alkali metal, an ammonium group or an organic amine, and n is a number of 0 or 1.). .