JPH0976629A - Recording ink - Google Patents

Abstract

(57) [PROBLEMS] To provide a recording ink capable of obtaining a color and a black character and an image having a better tint. SOLUTION: C.I. I. Direct Bl
cyan ink having ue 199 of 2.5% by weight,
C. I. Magenta ink containing 1.0 wt% of Acid Red 52, and C.I. I. Direct Yellow
Since the hue angle H ° of the cyan ink, the magenta ink, and the yellow ink was selectively adjusted, the ink of Example 4 in which the yellow ink having the w 132 of 2.5% by weight was mixed in the same amount was used. Color, D ₆₅ light source 2 ° field of view,
Lightness L * is 4 or less and saturation C is 10 mm under the condition of transmitted light path length.
* Is adjusted to 10 or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording ink in which cyan ink, magenta ink, and yellow ink are selectively adjusted.

[0002]

2. Description of the Related Art Heretofore, black colorants and colorants of cyan, magenta and yellow, which are colors in a hue circle showing a hue, have been widely used for writing instruments or for ink jet recording in which ink droplets are ejected from nozzles. ing.

Those using a black colorant in ink are disclosed in JP-A Nos. 57-115468 and 59-59.
It is disclosed in Japanese Patent Publication No. 133274. Further, as a colorant containing cyan, magenta, and yellow coloring agents, there are disclosed in JP-A-6-24123 and JP-A-6-24123.
No. 143617 is disclosed.

[0004]

However, in any case, since the hues of the cyan ink, the magenta ink, and the yellow ink are not taken into consideration, when the color image is formed, the respective color balances are bad, so that the overall The color tone of such a color image becomes poor, and it is difficult to form a good black image especially when a black image is formed using three colors of cyan ink, magenta ink, and yellow ink.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to obtain a color image having a better color tone, and use three colors of cyan ink, magenta ink and yellow ink. The present invention provides a recording means and an inkjet recording method capable of forming a good black image.

[0006]

In order to achieve this object, in the recording ink according to claim 1, the solution transmitted color obtained by diluting 200 times is changed to a D ₆₅ light source 2 ° field of view and a transmitted optical path length 10.
a cyan ink having a hue angle H ° of 230 ° to 260 ° when expressed in the L * a * b * color system under a measurement condition of mm, and at the same density as the cyan ink under the measurement condition. Magenta ink having a hue angle H ° of 330 ° to 360 ° (0 °) and yellow ink having a hue angle H ° of 85 ° to 115 ° at the same density as the cyan ink under the measurement conditions are equivalent. A 66-fold diluted solution of the mixed amount has a lightness L * of 4 or less and a saturation C *.
By adjusting and adjusting the cyan ink, the magenta ink, and the yellow ink so that the ratio becomes 10 or less, a color image having a better overall color balance and excellent color reproducibility and gradation. And a black image formed by using the three colors of the cyan ink, the magenta ink, and the yellow ink is a natural black color, is excellent in gradation, and is recorded with high optical density.

However, the hue angle H ° represents the angle in the chromaticity diagram of the L * a * b * color system in which a * and b * are expressed on a plane and is defined as follows.

When a * ≧ 0, b * ≧ 0 (first quadrant), H ° = tan ⁻¹ (b * / a *) a * ≦ 0, b * ≧ 0 (second quadrant), H ° = 180 ° +
tan ⁻¹ (b * / a *) a * ≦ 0, b * ≦ 0 (third quadrant), H ° = 180 ° + tan ⁻¹ (b * / a *) a
* ≧ 0, b * ≦ 0 (fourth quadrant), H ° = 360 ° + t
an ^-1 (b * / a *) The range of hue angle H ° is from X ° to Y
When expressed as °, it represents the range from the hue angle X ° in the L * a * b * color system chromaticity diagram to the counterclockwise hue angle Y °.

Further, the recording ink according to the second aspect is used for recording on a recording medium by being used in an ink ejecting device for ejecting ink from an ejection port.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto.

The colorant of the recording ink of the present invention includes:
It is preferable to use dyes used in various coloring fields, and specifically, dyes of azo type, anthraquinone type, indigo type carbonium type, phthalocyanine type and the like can be used.

The main solvent of the recording ink of the present invention is
It is preferably water, and is preferably distilled water or ion-exchanged water because of its low viscosity, excellent safety, easy handling, low cost, and no odor. If necessary, an evaporation inhibitor, a viscosity adjusting agent, a surface tension adjusting agent, a pH adjusting agent and the like can be used.

Specifically, as an evaporation inhibitor and a viscosity modifier, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, glycerin, 1,2,6-hexanetriol, Hexylene glycol and other polyhydric alcohols, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monoallyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether, Dipropylene glycol monomethyl ether, tripro Polyhydric alcohol alkyl ethers such as glycol monomethyl ether, ethylene glycol monophenyl ether, polyhydric alcohol aryl ethers such as ethylene glycol monobenzyl ether and the like can be used.

As the surface tension adjusting agent, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monoallyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether. , Polyhydric alcohol alkyl ethers such as dipropylene glycol monomethyl ether and tripropylene glycol monomethyl ether, polyhydric alcohol aryl ethers such as ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether, lower alcohols such as ethanol and 2-propanol Kind etc. can be used.

Examples of the pH adjusting agent include organic amines such as monoethylamine, diethylamine and triethylamine, alkanolamines such as diethanolamine and triethanolamine, and hydroxides of alkali metal elements such as sodium hydroxide and potassium hydroxide. , Carbonates of alkali metal elements such as sodium carbonate and potassium carbonate, ammonium hydroxide, and quaternary ammonium hydroxides can be used.

In the recording ink of the present invention, when the dye is water-soluble, the diluent solvent is mainly water, preferably distilled water or ion-exchanged water, and when the dye is oil-soluble, Organic solvents such as acyclic hydrocarbons such as hexane, cyclic hydrocarbons such as cyclohexane and toluene, alcohols such as ethanol and isopropyl alcohol, and ketones such as acetone are preferable.

An embodiment of the present invention will be specifically described.

Example 1 C. I. Direct Blue 199 2.5 wt% (solid content conversion) (Pro jet cyan 1: manufactured by Zeneca) Diethylene glycol 10.0 wt% Diethylene glycol monoethyl ether 4.0 wt% Ion-exchanged water Remaining amount of recording ink of Example 1 A specific manufacturing method will be described below. Introduction C. I. Direct Blue 199
And diethylene glycol and diethylene glycol monoethyl ether are mixed, and then ion-exchanged water is mixed and stirred so that the total is 100% by weight. Finally, in order to remove dust and the like, if necessary, the pressure is increased or reduced to filter through a filter or the like, and the ink is deaerated under reduced pressure to prepare an ink.

Example 2 C. I. Acid Red 52 1.0 wt% (solid content conversion) (Daiwa IJ Red 207H: manufactured by Daiwa Kasei) Diethylene glycol 10.0 wt% Diethylene glycol monoethyl ether 4.0 wt% Ion-exchanged water residual amount Example 3 C.I. I. Direct Yellow 132 2.5 wt% (solid content conversion) (Pro jet Yellow 1G: manufactured by Zeneca) Diethylene glycol 10.0 wt% Diethylene glycol monoethyl ether 4.0 wt% Ion-exchanged water residual amount Example 4 Example 1, Example An ink obtained by mixing equal amounts of the inks of Example 2 and Example 3.

Next, the above-mentioned embodiment will be described with reference to the drawings. A 200-fold diluted liquid of the above-described inks of Examples 1 to 3 was prepared using ion-exchanged water, and the solution permeation color was changed to
L * under measurement conditions of ₆₅ ° light source 2 ° field of view and transmitted light path length 10 mm
The result of measuring the hue angle H ° in the a * b * color system is shown in FIG. A 66-fold diluted solution of the ink of Example 4 was prepared using ion-exchanged water, and the solution permeation color was D _65.
L * a under the measurement conditions of 2 ° field of view of the light source and 10 mm of the transmitted light path length
The results of measuring the lightness L *, the saturation C *, and the hue angle H ° when expressed in the * b * color system are shown in FIG. As a result, a colorant satisfying a cyan ink having a hue angle H ° of 230 ° to 260 ° in Example 1 and a magenta ink having a hue angle H ° of 330 ° to 360 ° (0 °) in Example 2 were obtained. The ink of Example 4 in which an equal amount of a colorant satisfying the above conditions and the yellow ink having a hue angle H ° of 85 ° to 115 ° in Example 3 were mixed was prepared by using a 66-fold diluted liquid with ion-exchanged water. The solution transmission color is D ₆₅ light source 2 ° field of view, transmission optical path length 1
It was possible to obtain a black ink having a lightness L * of 4 or less and a saturation C * of 10 or less when expressed in the L * a * b * color system under the condition of 0 mm.

Therefore, recording was performed by using the recording inks of Examples 1 to 3 described above in the shear mode type ink jet device disclosed in Japanese Patent Laid-Open No. 2-150355. As a result, it was possible to perform excellent recording without causing nozzle clogging, the ink dried quickly after recording, and water resistance, abrasion resistance, and finger touch were excellent. Further, color image recording using three color inks of cyan ink, magenta ink, and yellow ink can also record a good color tone, and has excellent color reproducibility and gradation, and a black image formed by using three colors. The recording had a natural black color, excellent gradation, and high optical density was achieved.

However, the hue angle H ° represents an angle in the chromaticity diagram of L * a * b * color system in which a * and b * are expressed on a plane and is defined as follows.

When a * ≧ 0, b * ≧ 0 (first quadrant), H ° = tan ⁻¹ (b * / a *) a * ≦ 0, b * ≧ 0 (second quadrant), H ° = 180 ° +
tan ⁻¹ (b * / a *) a * ≦ 0, b * ≦ 0 (third quadrant), H ° = 180 ° + tan ⁻¹ (b * / a *) a
* ≧ 0, b * ≦ 0 (fourth quadrant), H ° = 360 ° + t
an ^-1 (b * / a *) The range of hue angle H ° is from X ° to Y
When expressed as °, it represents the range from the hue angle X ° in the L * a * b * color system chromaticity diagram to the counterclockwise hue angle Y °.

[0024]

As is apparent from the above description, according to the recording ink of the first aspect, the solution transmitted color obtained by diluting 200 times, the D ₆₅ light source 2 ° field of view, the transmitted light path length 10 m.
a cyan ink having a hue angle H ° of 230 ° to 260 ° when expressed in the L * a * b * color system under the measurement conditions of m, and a cyan ink having the same density as the cyan ink under the measurement conditions. Magenta ink having a hue angle H ° of 330 ° to 360 ° (0 °) and yellow ink having a hue angle H ° of 85 ° to 115 ° at the same density as the cyan ink under the measurement conditions are equivalent. A 66-fold diluted solution of the mixed amount has a lightness L * of 4 or less and a saturation C *.
Since the cyan ink, the magenta ink, and the yellow ink are selectively adjusted so that the ratio becomes 10 or less, a color image having a good color balance excellent in color reproducibility and gradation and having a good overall balance is obtained. Can be recorded,
Further, a black image formed by using the three colors of the cyan ink, the magenta ink, and the yellow ink is a natural black color, has excellent gradation, and enables recording with high optical density.

Since the recording ink according to claim 2 satisfies the condition of claim 1, it is suitable for being used in an ink ejecting apparatus for ejecting ink from an ejection port to perform recording on a recording medium. .

[Brief description of drawings]

FIG. 1 is a table showing L * a * b * tables obtained by diluting the inks of Examples 1 to 3 of the present invention with ion-exchanged water to obtain a solution transmission color _under conditions of a D ₆₅ light source 2 ° field of view and a transmission optical path length of 10 mm. It is an explanatory view of a measurement result when it expresses by a color system.

FIG. 2 is a diagram showing an L * a * b * color system in which the ink of Example 4 of the present invention is diluted with ion-exchanged water to obtain a solution transmitted color _under the conditions of a D ₆₅ light source 2 ° field of view and a transmission optical path length of 10 mm. It is explanatory drawing of the measurement result in the case represented by.

Continued Front Page (72) Inventor Masahito Kato 15-1 Naeshiro-cho, Mizuho-ku, Nagoya City Brother Industries, Ltd.

Claims (2)

[Claims] 1. A hue angle H ° when the solution transmitted color by 200-fold dilution is represented by an L * a * b * color system under a measurement condition of a D ₆₅ light source 2 ° field of view and a transmission optical path length 10 mm. Two
A cyan ink of 30 ° to 260 °, a magenta ink having a hue angle H ° of 330 ° to 360 ° (0 °) at the same density as the cyan ink under the measurement conditions, and The lightness L * of a 66-fold diluted solution of a solution obtained by mixing equal amounts of the cyan ink and the yellow ink having a hue angle H ° of 85 ° to 115 ° at the same concentration.
The recording ink, wherein the cyan ink, the magenta ink, and the yellow ink are selectively adjusted so that the color saturation is 4 or less and the saturation C * is 10 or less. 2. The recording ink according to claim 1, wherein the selectively adjusted cyan ink, magenta ink, and yellow ink are used in an ink ejecting device that ejects ink to perform recording on a recording medium. ink.