JPH09137099A - Water-based magenta ink for recording and ink-jet recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-based magenta ink for recording, having excellent magenta color tone, providing a clear printed image and free from clogging trouble, etc., and provide an ink-jet recording method using the magenta ink. SOLUTION: This water-based magenta ink for recording is produced by dissolving a magenta ink in water or a mixture of water and a water-soluble organic solvent, wherein the magenta ink is a mixture of C.I. Acid Red 52 and C.I. Acid Red 289. The invention also relates to an ink-jet recording method using the magenta ink.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous recording magenta ink and an ink jet recording method.

[0002]

2. Description of the Related Art Ink jet recording methods include, for example, an electrostatic attraction method, a method of applying mechanical vibration or displacement to ink by using a piezoelectric element, and bubbles generated by heating ink, and the pressure generated at this time. How to use
Various types of ink ejection methods are used to form ink droplets, and some or all of these are deposited on a recording material such as paper for recording.

The ink composition used in such an ink jet recording method is prepared by dispersing or dissolving a water-soluble pigment or water-soluble dye exhibiting each color in water or a mixed solvent of water and a water-soluble organic solvent. Pigment ink compositions or dye ink compositions are known.

[0004] Ink jet recording ink compositions include:
It does not cause clogging in the head of the recording device or in the ink flow path, does not cause changes in physical properties or precipitation of solids during storage, gives a recorded image of sufficiently high density with a clear color tone, Recording can be performed without limiting the type of recording material, the fixing speed to the recording material is fast, the water resistance, weather resistance, solvent resistance, and abrasion resistance are excellent, and images with excellent resolution can be displayed. Performances such as giving and physical properties such as viscosity and surface tension within appropriate ranges are required. Above all,
It is important that the liquid stability is such that clogging does not occur in the head tip portion of the recording apparatus or in the ink flow path, and precipitate does not occur.

The pigment ink composition is excellent in weather resistance,
Since the pigment is dispersed in the solvent, the liquid stability is poor, and when it is stored for a long time, the dispersion of the pigment becomes unstable and aggregation occurs. For this reason, clogging easily occurs at the head end portion of the ink jet recording apparatus. Therefore, Japanese Patent Laid-Open No. 1-20
As disclosed in Japanese Patent Publication No. 4979, etc., the content of the constituents of the pigment ink composition is defined, and JP-A-64-6074 is used.
As disclosed in Japanese Patent Publication No.
Although improvement has been achieved by controlling H, it is not sufficiently durable for use as an inkjet recording ink.

Although the dye ink composition is inferior in weather resistance to the pigment ink composition, it is less likely to cause clogging in the head tip portion of the recording apparatus or in the ink flow path, and is therefore widely used as an inkjet recording ink. ing. Many of such dye ink compositions are water-based ink compositions obtained by dissolving water-soluble dyes having various chemical structures in water or a mixed solvent of water and a water-soluble organic solvent.

On the other hand, when a full-color recorded image is reproduced using an aqueous dye ink, four primary color inks obtained by adding black ink to three primary color inks of yellow ink, magenta ink and cyan ink are used. The color tone of the recorded image is determined by the decolorization mixture of. These inks are ideal primary colors of yellow, magenta, cyan, and black that do not have other hues in order to give a recorded image with a clear color tone, which is one of the above-mentioned ink performances. Is also required to be presented.

[0008]

However, in the dye ink compositions currently commercialized, the color balance of each color of yellow, magenta and cyan and the sharpness of the recorded image are not sufficient, and various improvements are required. It is said that.
In particular, in magenta ink, there are few dyes that can reproduce magenta color favorably, and many of them exhibit a color close to red.

Japanese Unexamined Patent Publication (Kokai) No. 5-214259 discloses a yellow ink containing acid yellow 23, diethylene glycol, a preservative and water, and a direct red 22.
There is disclosed a dye set comprising a magenta ink containing 7, diethylene glycol, a preservative and water, and a cyan ink containing Acid Blue 9, a diethylene glycol, a preservative and water. However, with this technique, although the color balance is improved, the sharpness of the recorded image is not sufficient.

The present invention has been made to solve the above-mentioned problems, and has a good magenta color tone, enables vivid printing, and does not cause clogging or the like for recording aqueous magenta ink. And an inkjet recording method.

[0011]

The above object is to provide a recording water-based magenta ink prepared by dissolving a magenta dye in water or a mixed solvent of water and a water-soluble organic solvent, wherein the magenta dye is a color index number acid. This can be achieved by using a recording water-based magenta ink which is a mixed dye of Red 52 and Color Index Number Acid Red 289. Hereinafter, the present invention will be described in detail.

The magenta dye used in the present invention is a color index number Acid Red 52 (hereinafter, "CI Acid Red 52") which is a water-soluble acid dye.
That. ) And a color index number Acid Red 289 (hereinafter, referred to as “CI Acid Red 2”).
89 ". ) Is a mixed dye.

The above C. I. Acid Red 52 and C.I.
I. The mixing ratio of the mixed dye of Acid Red 289 is
It is preferably 5: 5 to 7: 3. If the mixing ratio is out of this range, a magenta color having a good hue cannot be obtained.

The above C.I. I. Acid Red 52 and C.I.
I. The content of the mixed dye in Acid Red 289 is preferably 0.7 to 2% by weight with respect to the total amount of magenta ink obtained. If it is less than 0.7% by weight or more than 2% by weight, the color density of the recorded image is not suitable.

The solvent used in the present invention is water or a mixed solvent of water and a water-soluble organic solvent. As the water, it is preferable to use deionized water instead of general water containing various ions. In the mixed solvent of water and the water-soluble organic solvent, the water-soluble organic solvent is used to prevent the ink from drying.

The water-soluble organic solvent is not particularly limited, and examples thereof include methyl alcohol, ethyl alcohol and n.
-Propyl alcohol, isopropyl alcohol, n-
Butyl alcohol, sec-butyl alcohol, ter
Lower alcohols such as t-butyl alcohol; amides such as dimethylformamide and dimethylacetamide; ketones such as acetone; keto alcohols such as diacetone alcohol; ethers such as tetrahydrofuran and dioxane; polyethylene glycol, polypropylene glycol, etc. Polyalkylene glycols; ethylene glycol, propylene glycol, butylene glycol,
Alkylene glycols such as diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, thiodiglycol, and hexylene glycol; ethylene glycol monomethyl ether,
Ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol monomethyl ethyl,
Lower alkyl ethers of polyhydric alcohols such as triethylene glycol monoethyl ethyl and triethylene glycol monobutyl ether; glycerin, 2-pyrrolidone, N-methyl-2-pyrrolidone, 1,3-dimethyl-
2-imidazolidinone and the like.

Of these, alkylene glycols such as glycerin and diethylene glycol; lower alkyl ethers of polyhydric alcohols such as triethylene glycol monoethyl ether are preferred.

The content of the water-soluble organic solvent is generally 0 to 95 with respect to the total amount of the magenta ink obtained.
% By weight is preferred. More preferably, 10 to 80% by weight
And more preferably 10 to 50% by weight. The water content at this time is determined in a wide range depending on the type of the water-soluble organic solvent, the composition, or the desired characteristics of the magenta ink, but with respect to the total amount of the magenta ink obtained, Generally from 10 to 95% by weight, preferably 1
It is 0 to 70% by weight, more preferably 20 to 70% by weight.

In the present invention, the magenta ink may include, for example, a cation type or an anion type, if necessary.
Various nonionic surfactants; polyvinyl alcohol,
Viscosity modifiers such as celluloses and water-soluble resins; surface tension modifiers; antifungal agents and the like may be added.
Further, when an aqueous ink used in an ink jet recording method of charging a recording liquid is prepared, a resistivity adjusting agent such as an inorganic salt such as ammonium chloride may be added.

In the ink jet recording method of the present invention, the above recording water-based magenta ink is used, and ink droplets of the above-mentioned water-based magenta ink are ejected from ejection ports according to a recording signal to perform recording on a recording material. The recording material is not particularly limited, and examples thereof include plain paper, coated paper, and transparent film.

In the present invention, when the above recording aqueous magenta ink is used, a magenta color tone is good and a clear image can be obtained, and clogging occurs at the head end portion of the ink jet recording apparatus or in the ink flow path. An ink jet recording method that does not occur is achieved.

[0022]

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

Example 1 Pure water (72.3 parts by weight) was added with C.I. I. Acid red 52
(0.35 parts by weight), C.I. I. Acid Red 289
(0.35 parts by weight), glycerin (22 parts by weight), and diethylene glycol-n-monobutyl ether (5 parts by weight) were added, and the mixture was stirred for 30 minutes and then filtered through a membrane filter having a pore size of 0.7 μm to prepare a magenta ink composition. I got a thing. (Mixing ratio of CI Acid Red 52 and CI Acid Red 289 is 5: 5, total concentration is 0.7% by weight)
When printing was performed using the shear mode type ink jet head disclosed in Japanese Patent Publication No. 150355, the ejection was good, and the obtained print had high saturation and vividness,
It was a magenta color which was preferable in terms of hue.

Example 2 Example 1 except that the total concentration of dyes was 1.8%.
A magenta ink composition was prepared in the same manner as in Example 1, and
When printed in the same manner as in (1), the jetting was good, the obtained print was highly saturated and vivid, and the magenta color was favorable in terms of hue.

Example 3 Pure water (72 parts by weight) was treated with C.I. I. Acid red 52
(0.6 weight part), C.I. I. Acid Red 289
(0.4 parts by weight), glycerin (22 parts by weight), diethylene glycol-n-monobutyl ether (5 parts by weight)
Was added, and the mixture was stirred for 30 minutes and then filtered through a membrane filter having a pore size of 0.7 μm to obtain a magenta ink composition. (The mixing ratio of CI Acid Red 52 and CI Acid Red 289 is 6: 4, and the total concentration is 1% by weight.) When this magenta ink composition was printed in the same manner as in Example 1, ejection was performed. The obtained print had good color saturation and high vividness, and was a magenta color that was favorable in terms of hue.

Example 4 C. was added to pure water (72.2 parts by weight). I. Acid red 52
(0.56 parts by weight), C.I. I. Acid Red 289
(0.24 parts by weight), glycerin (22 parts by weight) and diethylene glycol-n-monobutyl ether (5 parts by weight) were added, and the mixture was stirred for 30 minutes and then filtered through a membrane filter having a pore size of 0.7 μm to give a magenta ink composition. I got a thing. (Mixing ratio of CI Acid Red 52 and CI Acid Red 289 is 7: 3, total concentration is 0.8% by weight) When this magenta ink composition was printed in the same manner as in Example 1, The jetting was good, the obtained print was highly saturated and vivid, and the hue was a magenta favorable. Example 5 Example 4 except that the total concentration of dyes was 1.5%.
A magenta ink composition was prepared in the same manner as in Example 1, and
When printed in the same manner as in (1), the jetting was good, the obtained print was highly saturated and vivid, and the hue was preferably magenta.

Comparative Example 1 Instead of the mixed dye used in Example 3, C.I. I. A magenta ink composition was prepared in the same manner as in Example 3 except that only Acid Red 52 was used, and printing was performed in the same manner as in Example 1. The ejection was good, and the saturation of the obtained print was Although it was high and vivid, it was bluish and the color tone as magenta was poor. Comparative Example 2 Instead of the mixed dye used in Example 3, C.I. I. A magenta ink composition was produced in the same manner as in Example 3 except that only Acid Red 289 was used, and printing was performed in the same manner as in Example 1. The jetting was good, and the saturation of the obtained print was It was high and bright, but it had a pink color,
The color tone as magenta was bad. Comparative Example 3 Instead of the mixed dye used in Example 3, C.I. I. A magenta ink composition was produced in the same manner as in Example 3 except that Direct Red 227 was used, and printing was performed in the same manner as in Example 1. The ejection was good, but the magenta of the obtained printed matter was It was reddish, had low saturation, and had a poor color tone as magenta.

Examples 1 to 5 were excellent in jetting, high in saturation and vividness of printed matter, and good in color tone as magenta.
All of the magenta ink compositions of C.I. I. Acid Red 52 and C.I. I. A mixed dye of Acid Red 289 was used. In addition, the above C. I. Acid Red 52 and C.I. I. The mixing ratio of Acid Red 289 was 5: 5 to 7: 3, and the total concentration of both was 0.7 to 2% by weight in the magenta ink composition. On the other hand, in Comparative Examples 1 to 3 in which the color saturation of the printed matter was poor and the color tone as the magenta color was poor, none of the above conditions was satisfied.

[0029]

Since the water-based magenta ink for recording and the ink jet recording method of the present invention are as described above, there is no clogging at the tip of the head of an ink jet printer or in the ink flow path, and a magenta color ink is obtained. It is possible to obtain a clear recorded image with good color tone.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahito Kato, 15-1 Naedai-cho, Mizuho-ku, Nagoya-shi Brother Industrial Co., Ltd. Within

Claims (4)

[Claims] 1. A recording water-based magenta ink comprising a magenta dye dissolved in water or a mixed solvent of water and a water-soluble organic solvent, wherein the magenta dye is a color index number acid red 52 or a color index number acid. A water-based magenta ink for recording, which is a mixed dye of Red 289. 2. The mixing ratio of the mixed dyes of Color Index Number Acid Red 52 and Color Index Number Acid Red 289 is 5: 5 to 7: 3.
The water-based magenta ink for recording according to claim 1. 3. The content of the mixed dye of Color Index Number Acid Red 52 and Color Index Number Acid Red 289 is 0.7 to 2% by weight with respect to the total amount of the recording water-based magenta ink. Or the water-based magenta ink for recording according to item 2. 4. An ink jet recording method for recording on a recording material by ejecting ink droplets from an ejection port according to a recording signal, wherein the ink is the aqueous magenta ink for recording according to claim 1. An inkjet recording method characterized by the above.