JPH0391576A - Recording liquid - Google Patents

Abstract

PURPOSE:To improve the long-term storage stability of a recording fluid. and improve the density and resistance to light, water, and ozone of the recorded image by compounding a specific dye into the recording fluid. CONSTITUTION:0.5-8wt.% at least one dye of the formula (wherein A and B are each alkyl, alkoxy, acylamino, SO3M, phenyl optionally substd. by halogen, or SO3M-substd. naphthyl; X is Cl or NH2; M is an alkali metal, ammonium, or amine salt; and l and m are each 0 or 1), 10-90wt.% solvent comprising water and a water-sol. org. solvent, and, if necessary, 0.1-10wt.% compd. selected from the group consisting of (thio)urea, biuret, and semicarbazide, and 0.001-0.5wt.% surfactant are compounded to give a black recording ink with a pH of 6-8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a black recording liquid suitable as a recording liquid for inkjet recording and writing instruments.

[Conventional technology]

In this type of recording liquid, the solvent used must have fast fixation and print quality when printing on papers commonly used in general offices, such as PPC paper and fan-hold paper. In addition to the above requirements, stability during storage is also required, and the current situation is that the solvents that can be used are severely limited.

On the other hand, the dyes used in these recording liquids have sufficient solubility in the limited solvents mentioned above, are stable even when stored for long periods of time, and are also stable in printed images. It is required to have high concentration, excellent water resistance, light resistance, and ozone resistance.

It is quite difficult to satisfy many of the above requirements at the same time. In particular, with regard to light resistance and ozone resistance, the light resistance and ozone resistance of pigments (organic and inorganic) used as colorants in other printing methods (e.g., electrophotographic methods, heat-sensitive melt transfer methods, etc.) Therefore, there is a strong demand for the development of recording liquids for inkjet recording and writing instruments containing dyes with good light fastness and ozone fastness that can compete with pigments.

For this purpose, JP-A-55-144,065, JP-A-5
No. 7-30.773, JP-A-57-207.660,
JP-A-58-147,470, JP-A-62-190.
No. 269, JP-A-62-190.271, JP-A-62
Although many applications have been filed, such as No. 190.272 and Japanese Unexamined Patent Publication No. 62-250.082, market demands have not yet been completely satisfied.

[Problem to be solved by the invention]

The present invention has high solubility, is stable even when stored for a long period of time, has high density printed images, and is water resistant.
The object of the present invention is to provide a black recording liquid containing a dye that has excellent light resistance, particularly ozone resistance.

[Means to solve the problem]

The present invention relates to the following general formula (1) (wherein A and B are substituted with an alkyl group, an alkoxy group, an acylamino group, a So, M group, or a phenyl group which may be substituted with a halogen atom, or a SO, M group). represents a naphthyl group, X represents a chlorine atom or aξ) group, M
represents an alkali metal, ammonium or amine salt; 12. The present invention relates to a recording liquid characterized by containing at least one dye represented by the formula (m represents 0 or 1).

The present invention will be explained in detail below.

When A or B is a substituted phenyl group, examples of the substituent alkyl group and alkoxy group include an alkyl group having 1 to 4 carbon atoms and an alkoxy group, and examples of the acyl group of the acylamino group include an acetyl group and a fluorhionyl group. Examples of the halogen atom include an alkylcarbonyl group having 2 to 5 carbon atoms such as Cr2. I can give F.

The alkali metals represented by M include Na and K.

Examples of amine salts include Li (mono, di,

Examples include tri←alkylamine, (mono-, di-, tri←alkanolamine), di- or tri-substituted amine with both an alkyl group and an alkanol, and the like.

Specific examples of the dye of general formula (1) used in the present invention include the following.

Magnetic 2 Blood 4 M: IbN(C!HnOH)z Magnetic 5 Na6 Na7 S〇-axis The compound of the present invention can be found, for example, in "New Dye Chemistry" by Yutaka Hosoda (
Published December 21, 1972, Gihodo) No. 396, No. 1
It can be produced by conventional diazotization, coupling and triazinylation according to the descriptions in line 14 from the top of line 407 and line 4 from line 441 to line 5 from line 442.

The content of the above-mentioned dye is 0.0% based on the total weight of the recording liquid.
A range of 5 to 8%, preferably a range of 2 to 5% is mentioned.

In addition to water, examples of solvents used in the recording liquid of the present invention include water-soluble organic solvents such as ethylene glycol, propylene glycol, butylene gelicol, diethylene glycol, triethylene glycol, and polyethylene glycol (
#200), polyethylene glycol (#400), glycerin, N-methyl-pyrrolidone, N-ethyl-pyrrolidone, N-vinyl-pyrrolidone, 1,3-dimethyl-
It is preferable to contain imidasilidinone, ethylene glycol monoallyl ether, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, etc., and the content of water and water-soluble organic solvent is as follows:
The amount of each of these is 10 to 90% by weight, preferably 10 to 70% by weight, and more preferably 10 to 50% by weight, based on the total weight of the recording liquid.

Further, the pH of the recording liquid of the present invention is preferably 6 to 8.

Furthermore, the recording liquid of the present invention has a temperature of 0°1-1 based on the total weight of the recording liquid.
0% by weight, preferably 0.5 to 5% by weight of a compound selected from urea, thiourea, biuret, and carbazide, or 0.001 to 0.5% by weight of a surfactant. This makes it possible to further improve the quick-drying properties and print quality after printing.

〔Effect of the invention〕

The recording liquid of the present invention is used as a black recording liquid for inkjet recording, writing instruments, etc., and even when recorded on plain paper, the recorded image has excellent light resistance, water resistance, and ozone resistance. The storage stability as a recording liquid is also good.

〔Example〕

The present invention will be explained in more detail with reference to the following examples, but the present invention is not limited to these examples in any way.

Example 1 Ethylene glycol monoallyl ether 25 ethylene glycol 22 11 kkl of the above compound 3.5 total
100 The above components were thoroughly mixed and dissolved in a container, filtered under pressure through a Teflon filter with a pore size of 1 μm, and then degassed using a vacuum pump and ultrasonic waves to prepare a recording liquid.

Using the obtained recording liquid, inkjet printer (
Inkjet recording was performed using HG-4800 (manufactured by Epson Corporation), and the inkjet recording was evaluated according to the methods (a) and (b) below.

(a) Long-term storage stability of recording liquid: Even after recording liquid was sealed in a glass container and stored at 10"C and 60"C for 6 months, no precipitation of insoluble matter was observed, and the physical properties and color tone of the liquid did not change. There was no change.

(b) Quality of recorded image: The recorded image was blank in color, had high density, and was clear. The rate of decrease in density after three months of exposure to room light was less than 1%, and the rate of decrease in density after 100 hours of exposure using a xenon fade meter (manufactured by Suga Shikenki ■) was as low as 7%.

In addition, J
When determined using IS Z8730, the value was as small as 4.

Further, after 24 hours of immersion in water, there was only slight blurring of the image and a small decrease in density.

Example 2 Composition of recording liquid Amount used (wt%) Glycerin 10 Ethylene glycol 10 Amount of the above Nα3 compound used (wt%) Total 100 A recording liquid with the above composition was prepared in the same manner as in Example 1, and (a) As a result of examining (2) and (b), favorable results were obtained in both cases.

Example 3 Recording liquid! Diethylene glycol monobutyl ether 5 Glycerin 15 Compound of Ko 2 above
2 total
100 According to the method of Example 1, above a
A recording liquid consisting of the following liquid was prepared and evaluated according to the methods (a) and (c) described in Example 1. As a result, all of the recording liquids were good.

Examples 4 to 7 Nα4゜Na5 in place of the compound No. 1 in Example 1
．． Recording liquids were prepared using the Nap and Na7 compounds and evaluated in the same manner as in Example 1. As a result, both were good.

Claims (1)

[Claims] Solvent and the following general formula [I] ▲There are mathematical formulas, chemical formulas, tables, etc.▼... [I] (In the formula, A and B are an alkyl group, an alkoxy group, an acylamino group, an SO_3M group, or a halogen Represents a phenyl group which may be substituted with an atom or a naphthyl group substituted with an SO_3M group, X represents a chlorine atom or an amino group, M represents an alkali metal, ammonium or amine salt, l, m are 0 or 1.) A recording liquid characterized by containing at least one dye represented by: