JP3018582B2 - Recording liquid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording liquid. More specifically, the present invention 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 to practical use in which recording is performed by flying droplets of a recording liquid containing a water-soluble dye such as a direct dye or an acid dye from a minute discharge orifice. Regarding this recording liquid, PP such as electrophotographic paper
Fast fixing to recording paper used for general office work such as C (plain paper copier) paper and fan hold paper (continuous paper such as a computer), and the print quality of printed matter is good. It is required that the outline is clear without any defects and that the stability during storage as a recording liquid is also excellent,
Therefore, usable solvents are significantly limited.

On the other hand, dyes for recording liquids have sufficient solubility in the above-mentioned limited solvents and are stable even when stored as recording liquids for a long time.
Further, it is required that the density of the printed image is high, and that it is excellent in water resistance and light resistance. However, it has been difficult to satisfy many of these requirements at the same time. Therefore, various methods (for example, JP-A-55-1440065, JP-A-57-30773, JP-A-57-207660,
JP-A-58-147470, JP-A-62-19026
9, JP-A-62-190271, JP-A-62-19
No. 0272, JP-A-62-250082 and JP-A-62-1982
JP-A-246975, JP-A-62-257971, JP-A-62-288659, JP-A-63-8463, JP-A-63-22867, JP-A-63-22874,
JP-A-63-30567, JP-A-63-33484
JP-A-63-63764, JP-A-63-1050
No. 79, JP-A-64-31877, JP-A-1-933
No. 89, JP-A-1-210464, JP-A-2-140
No. 270) has been proposed, but has not yet been able to sufficiently satisfy the market requirements.

[0004]

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

[0005]

Means for Solving the Problems The present inventors have confirmed that the above objects can be achieved when a specific dye is used as a recording liquid component, and have achieved the present invention. That is, the gist of the present invention resides in a recording liquid containing an aqueous medium and at least one of the dyes represented by the general formula [I] in claim 1. Hereinafter, the present invention will be described in detail. In the general formula [I], the alkali metal represented by M is N.
a, K, Li, etc., and examples of the organic amine salt include three or four hydrogen atoms of an ammonium group having an alkyl group having 1 to 4 carbon atoms and / or
And a group substituted with a hydroxyalkyl group.
Specific examples of these dyes include, for example,
An azo dye having the structure shown in (c) is mentioned.

[0006]

Embedded image

The azo dye represented by the general formula [I] can be prepared by a method known per se [for example, Yutaka Hosoda, "New Dye Chemistry" (published by Gihodo on December 21, 1973, Gihodo), 396-409.
Page]], a diazotization and coupling step. The content of the dye of the general formula [I] in the recording liquid is preferably 0.5 to 5% by weight, particularly preferably about 2 to 4% by weight, based on the total amount of the recording liquid.
Examples of the solvent used in the recording liquid of the present invention include water and water-soluble organic solvents such as ethylene glycol, propylene glycol, butylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol (# 200), and polyethylene glycol (# 40).
0), glycerin, N-methyl-pyrrolidone, N-ethyl-pyrrolidone, 1,3-dimethyl-imidazolidinone, ethylene glycol monoallyl ether, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, and the like. . These water-soluble organic solvents are usually used in an amount of 1 to the total amount of the recording liquid.
It is used in the range of 0 to 50% by weight. On the other hand, water is used in the range of 45 to 89.5% by weight based on the total amount of the recording paper.

In the recording liquid of the present invention, the amount of the recording liquid is 0.1% based on the total amount.
1 to 10% by weight, preferably 0.5 to 5% by weight of urea,
By adding a compound selected from thiourea, biuret, and semicarbazide, and by adding 0.001 to 5.0% by weight of a surfactant, it is possible to further improve the quick-drying property after printing and the print quality. it can.

[0009]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which, however, are not intended to limit the scope of the invention. Example 1 Water was added to 22 parts by weight of diethylene glycol and 2.5 parts by weight of the dye of the above formula (a) to adjust the total amount to 100 parts by weight. This composition was thoroughly mixed and dissolved, and the pore size was adjusted. After filtration under pressure with a 1 μm Teflon filter, the recording liquid was prepared by degassing with a vacuum pump and an ultrasonic cleaner. Using the obtained recording liquid, ink jet recording was performed on electrophotographic paper (manufactured by Fuji Xerox) using an ink jet printer (trade name: HG-3000, manufactured by Epson Corporation), and the following (a), (b) and ( The result of performing various evaluations by the method c) is shown. (A) Light fastness of recorded image: Recording paper was irradiated for 100 hours using a Canon Fade Meter (manufactured by Suga Test Instruments Co., Ltd.). Discoloration after irradiation was small.

(B) Water resistance of recorded image: The bleeding of the image was examined after immersing the recording paper in water for 5 minutes. The bleeding of the image was slight, and the decrease in density was small.

(C) Storage stability of the recording solution: The recording solution is sealed in a Teflon container, and stored at 5 ° C. and 60 ° C.
Changes after storage for a month were examined. No precipitation of insolubles was observed.

Example 2 Water was added to 5 parts by weight of diethylene glycol monobutyl ether, 15 parts by weight of glycerin and 2 parts by weight of the dye of the formula ( b ) to make the total amount 100 parts by weight. This composition was described in Example 1. The recording liquid was prepared by the method described above, and various evaluations according to (a) to (c) of Example 1 were performed. As a result, similar to Example 1, good results were obtained.

[0013] Instead of the dye of the (a) type used in Example 3 Example 1, except for using the dye of (c) expression recording liquid was prepared by the method of Example 1, performed Example 1 (a) to (c)
Were evaluated. As a result, similar to Example 1, good results were obtained.

[0014]

The recording liquid of the present invention is used for ink-jet recording and writing instruments, and is excellent in print density, light resistance and water resistance of a recorded image when recorded on plain paper. As well as storage stability.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-64-79277 (JP, A) JP-A-2-276873 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C09D 11/00-11/20 CA (STN) REGISTRY (STN)

Claims (1)

(57) [Claims] 1. A recording liquid comprising an aqueous medium and at least one dye selected from dyes represented by the following general formula [I]. Embedded image (Wherein X represents a C OOM, Y and Z each represents H,
CH ₃ or OCH ₃ , M is an alkali metal, NH
₄ or an organic amine salt. )