JPH0354268A - Recording fluid - Google Patents

Abstract

PURPOSE:To obtain a recording fluid which can give a print of excellent ozone resistance by mixing a specified compound with a water-soluble dye and an aqueous medium. CONSTITUTION:0.5-10 wt. % compound of formula I (wherein X is -NH-, -NHCONH- or a group of any one of formulas II-V; and M is Li, Na or NH4) is mixed with 0.2-12 wt. % water-soluble dye being an azo, anthraquinone or phthalocyanine direct or acid dye (e.g. C.I. Direct Black 154), 63-98.8 wt. % aqueous medium (containing, e.g. ethylene glycol) and optionally 0.5-20 wt. % surfactant, and the pH is adjusted to 6-8.

Description

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

[Conventional technology]

The inkjet recording method has the advantages of low noise during recording, ease of color printing on large formats, and low running costs, and a market as a non-impact printer is being established.

In recent years, water-based inks have been mainly used in inkjet recording systems due to odor, fire hazards, and safety concerns. These water-based inks have appropriate physical properties such as viscosity and surface tension: they do not clog the nozzle, have excellent storage stability, and have high density of colored images, light resistance, Properties such as excellent water resistance and ozone resistance are required.

As the coloring material in such water-based inks, water-soluble dyes are used because the liquid medium is water-based, and among the above basic requirements, water resistance is almost satisfied.

When a water-soluble dye is used, it is inherently inferior in light resistance and ozone resistance compared to carbon black or pigments, so some kind of protective agent is required. For this reason, the addition of ultraviolet absorbers, antioxidants, or 02 quenchers, for example, has been considered.
No. 971, JP-A-59-53,566, JP-A-59-
No. 53567, Japanese Patent Application Publication No. 59-51.961, Publication No. 59-51.
4-85.804, JP-A-54-68,303, and JP-A-64-75,282.

However, these recording liquids also have major drawbacks regarding the above-mentioned problems, such as not being able to obtain sufficient effects, or even if they do produce effects, the nozzle tips tend to become clogged.

[Problems to be Solved by the Invention] It is an object of the present invention to provide a recording liquid that can produce prints that are particularly excellent in luminescence resistance and ozone resistance.

(Means for Solving the Problems) The gist of the present invention is a recording liquid containing a water-soluble dye, an aqueous medium, and a compound represented by the following general formula (1).

The water-soluble dyes used in the present invention include adzu-based, anthraquinone-based, and lidocyanine-based direct dyes and acid dyes, such as C, I, Direct Bla
ck-17, -19, -22, 32, -51, -80,
-91, -151 and 154, C. T. Direct
Blue-86 and -199, C.I. I, Direct
Red80, C, I. Direct Yellow
w-86 and -142, C, I, Acid Black
k-2, -24, -26, -48, -52, ~63, -
172, -194 and -208, C. I, AC
id! 3 1 ue - 9, -185 and -
254, C, l, Acid Red-8, -35, -
37 and -257, C,I. Acid Yellow
23 and -49 and C, I, Food. Black
-2 etc. are mentioned.

The content of the above-mentioned water-soluble dye is 0.0% based on the total weight of the recording liquid. A range of 2 to 12%, preferably a range of 2 to 8% is mentioned.

In addition to water, examples of the water+1 medium of the present invention include ethylene glycol, brobylene glycol, butylene glycol, diethylene glycol, triethylene glycol,
Polyethylene glycol (#200), polyethylene/glycol (#400), glycerin, N-methyl-pyrrolidone, N-ethyl-virolidone, N-vinyl-virolidone, 13-dimethyl-imidazolidinone, ethylene glycol monoallyl ether , ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, etc. The aqueous medium preferably contains 63 to 98.8% by weight based on the total weight of the recording liquid.
The range of

The compound of the general formula CI) is described in "Theory/Manufacturing Dye Chemistry (
"New Dye Chemistry (written by Yutaka Hosoda, Gihodo Publishing)" from line 540, line 3 from the bottom to page 542, line 9, and "New Dye Chemistry" (written by Yutaka Hosoda, Gihodo Publishing), page 441, line 3 to line 44 from the bottom.
It can be manufactured according to the description on page 2, line 5.

Such specific examples are summarized below.

110 OH NHz N(CJ4011)z N}If (In each case, M represents Li, Na, NH.) Record of the compound represented by the above general formula (1.); - Based on the total weight at night Te 0. It is used in a range of 5 to 10% by weight.

The pH of the recording liquid of the present invention is usually adjusted to 6-8C.

Further, the recording liquid of the present invention has a density of 0.5 to 2% per total weight of the recording liquid.
By adding 0% by weight of a surfactant, it is possible to improve the quick drying properties and print quality after printing.

[Examples] The present invention will be explained in more detail with the following Examples, but the present invention is not limited to these Examples.

Example 1 Recording liquid composition or usage amount (wt%) C, I,
Direct Black - 1 5 4
3 Ethylene glycol 22 Remaining amount of water Thoroughly mix and dissolve each of the above amounts in a container, filter under pressure using a Teflon filter with a pore size of 1 μm, and then deaerate using a vacuum pump and ultrasonic waves to prepare a recording liquid. did.

Using the obtained recording liquid, inkjesoto printer (
Inkjet recording was performed using HG-4 800 (manufactured by Epson Corporation), and the inkjet recording was evaluated according to the methods (a) to (d) below.

(a) Long-term storage stability of the recording liquid: Even after the 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 remained unchanged. There was no change.

(b) Ejection stability: Continuous ejection was carried out for 24 hours in an atmosphere of room temperature, 5° C., and 40° C. Under all conditions, stable high-quality recording was possible from beginning to end.

(C) Ejection response: Intermittent ejection every 2 seconds and ejection after being left for 2 months were investigated, and in both cases, stable and uniform recording was achieved without clogging at the orifice tip.

(d) Quality of recorded image: The recorded image had high density and clarity. The rate of decrease in density after 3 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 Test Instruments) was as low as 7%.

In addition, JIS Z
When calculated using 8730, the directivity was as small as 5.

Comparative Example 1 In the recording liquid of Example 1, a recording liquid of the same composition was prepared and evaluated in the same manner as in Example 1.

As a result, the discoloration and fading ΔE1 due to ozone exposure was as large as 16.

Example 2 Recording liquid composition or usage amount C, LFood Black-2 Glycerin Ethylene Glycol A recording liquid of the above composition was prepared in the same manner as in Example 1, and (a
) to (d), good results were obtained in all cases.

Examples 3 to 6 According to the method of Example 1, a certain recording liquid was prepared from the composition listed in Table I below, and according to the method of (al to (d)),
As a result of the evaluation, all were good.

[Effects of the Invention] The recording liquid of the present invention is used for inkjet recording, writing instruments, and the like.

In particular, when used for inkjet recording, recording characteristics (signal response, stability of droplet formation, ejection stability, long-term continuous recording), storage stability, light resistance, ozone resistance, and weather resistance of recorded images are particularly important. , water resistance, etc., and in particular, prints with excellent light resistance and ozone resistance can be obtained, making it very useful.

applicant

Claims (1)

[Claims] (1) Water-soluble dye, aqueous medium, and the following general formula [I] ▲There are mathematical formulas, chemical formulas, tables, etc.▼…[I] (In the formula, X is -NH-, -NHCONH-, ▲Mathematical formulas, chemical formulas, tables, etc. ▼ ▲There are mathematical formulas, chemical formulas, tables, etc.▼ A recording liquid characterized by containing a compound represented by ▼ where M represents Li, Na, NH_4.