JPH05155005A - Color imaging process - Google Patents

Abstract

(57) [Summary] [Structure] When a color image is recorded using a recording liquid composed of at least a dye or pigment, a water-soluble resin and an aqueous medium, a dye or pigment exhibiting each color of yellow, magenta and cyan is used as a specific compound. Select from the group. [Effect] It is possible to obtain a color image having excellent water resistance, light resistance, ozone resistance, vividness, and color rendering of each color.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a color image, and more particularly to a method for forming a color image using a combination of yellow, magenta, cyan, and black aqueous inks, and in particular, thermal energy from an orifice of a recording head. The present invention relates to a method for forming a color image by an inkjet method, in which a recording liquid is caused to fly by the action of, and a color image is formed on a recording material such as paper or a resin film.

Further, the present invention relates to a method for forming a color image by an ink jet system in which the fastness (light resistance and ozone resistance) of the obtained image is improved.

[0003]

2. Description of the Related Art The ink jet recording system has an advantage that noise is not generated during recording and a high resolution recording image can be obtained at a high speed by using a highly integrated head. In such an ink jet recording system, a color image is formed by using, as an ink, various water-soluble dyes and pigments, which are dissolved in water or a mixed liquid of water and an organic solvent, to have a plurality of different hues. Is possible. The ink used in such an inkjet system is required to have the following performance.

(1) To give an image excellent in water resistance, light resistance and abrasion resistance.

(2) To provide an excellent image without causing discoloration due to ozone, temperature and humidity (ozone resistance) even in a place without light irradiation.

(3) The resolution or color reproducibility in color image formation is excellent not only on coated paper but also on plain paper.

(4) To provide an image having a high optical density and a clear color tone.

(5) It has high dissolution stability or storage stability with respect to liquid medium components, and is unlikely to cause clogging of the discharge orifice.

Particularly in the case of a color image, if the ink fastness of even one of yellow, magenta, cyan and black inks is poor, the quality of the entire image will be impaired. It is natural that various performances are required as the pigment of the water-based ink in the inkjet system, but in the case of forming a color image in particular, the mutual water resistance of the yellow, magenta, and cyan dyes and pigments is also required. It is important that the properties such as light resistance, light resistance, and ozone resistance are well balanced, and that the mutual color rendering relationship is good. It has been extremely difficult to find a combination of three primary color pigments having such characteristics.

[0010]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an image forming method which gives a color image which satisfies all the requirements (1) to (5) in a well-balanced manner.

[0011]

[Means for Solving the Problems] The inventors of the present invention have conducted extensive studies to achieve the above-mentioned object. As a result, when conventional water-soluble dyes were used, the characteristics of the above (1) to (5) It was judged that each color could not be satisfied, and a study was conducted on pigments. As a result, a combination of a specific dye and pigment was suitable for a color image forming method satisfying all the characteristics of (1) to (5) above. Therefore, the present invention has been achieved as follows.

That is, according to the present invention, in the color image forming method of forming a color image by applying at least yellow, magenta and cyan color inks to a recording material, the yellow ink is represented by the following general formula (I).

[0013]

[Chemical 3] (However, A in the formula (I) is -NHCONH- or

[0014]

[Chemical 4] Represents a bond, X ₁ and X ₂ represent —SO ₃ M, —COOM or a phenyl group which may be substituted with a hydroxyl group and a naphthyl group, R represents a methyl group or a methoxy group, and n represents 0 or 1. , M represents an alkali metal, ammonium or an organic amine. ) Containing at least one of the compounds shown by the formula) as a dye, and the magenta ink is CI Pigment Red 5, CI Pigment Red 7, CI
Pigment Red 12, CIPigment Red 48 (Ca), CIPigmen
t Red 48 (Mn), CIPigment Red 57 (Ca), CIPigment
Red 112, CIPigment Red 122, containing at least one pigment, and the cyan ink is C.I.
I. Reactive Blue 14, C.I. I. Reactive Blue 15, C.I. I. Reactive Blue 63, C.I. I.
Reactive Blue 41, C.I. I. Reactive Blue 227, C.I. I. Reactive Blue 279, C.I. I.
Direct Blue 86 and C.I. I. Direct blue 1
This is a color image forming method containing at least one dye selected from 99.

Further, the present invention is a color image forming method in which a black ink containing at least carbon black is further applied to the recording material in the previous period in order to express black color with good color tone reproducibility. ..

The present invention also provides an ink jet recording method in which thermal energy is applied to a recording liquid and the liquid is ejected as droplets from fine holes for recording, and the recording liquid contains the above dye or pigment. This is a color image forming method.

The present invention will be described in detail below.

The recording liquid used in the image recording method of the present invention is
It comprises at least a dye, a pigment, a water-soluble resin and an aqueous medium, and the aqueous medium contains a polyhydric alcohol and an aliphatic monohydric alcohol.

The yellow dye represented by the above general formula (I) used in the present invention may be any dye as long as it is included in the above general formula (I). For example, the following may be mentioned.

[0020]

[Chemical 5]

[0021]

[Chemical 6]

[0022]

[Chemical 7] As the cyan dye, one kind or a plurality of kinds are selected from the above compound group and used. Among the above compounds, C.I.
I. Reactive Blue 14 or C.I. I. An image using Reactive Blue 63 has clear color reproduction and is excellent in light resistance and ozone resistance.

The dyes used in the present invention are generally soda salts of water-soluble groups such as sulfonic acid groups, but the present invention is not limited to these soda salts, and their counter ions are potassium, Lithium, ammonia, organic amines and the like have the same effect, and the present invention also includes dyes containing these other counter ions.

The content of each of the above-mentioned specific dyes in each ink is determined depending on the type of liquid medium component, the properties required for the ink, etc., but generally it is a weight percentage in the total weight of the ink. 0.1 to 20%, preferably 0.5 to 15%, more preferably 1 to 10
It is considered as a range that occupies%. The dyes can be used alone or in combination of two or more kinds, or other various dyes such as direct dyes and acid dyes can be used in combination with the dye as an essential component.

Next, as the magenta pigment, one kind or a plurality of kinds are selected from the compound group represented by the following structural formula and used.

[0026]

[Chemical 8]

[0027]

[Chemical 9]

[0028]

[Chemical 10]

[0029]

[Chemical 11]

[0030]

[Chemical 12]

[0031]

[Chemical 13]

[0032]

[Chemical 14]

[0033]

[Chemical 15] Examples of black pigments include carbon black. The carbon black may be new or commercially available. For example, NO.2300, NO.900, MCF88, N
O.33, NO.40, NO.45, NO.52, MA7, MA8, # 2200B (Made by Mitsubishi Kasei), RAVEN 1255 (Colombia), REGAL 40
0R, REGAL 330R, REGAL 660R, MOGUL L (Cabot), Color Black FW1, COLOR Black FW18, Color Bl
ack S170, Color Black S150, Printex 35, Printex U
Commercially available products such as (Degussa) can be used.

The above black pigments may be used alone or in combination.

The recording liquid of the present invention may contain pigments other than the above.

The content of the pigment used in the present invention varies depending on the pigment type, but generally it is 3 by weight with respect to the recording liquid.
-20% by weight, preferably 3-12%.

The water-soluble resin used in the present invention is
It functions as a dispersant for dispersing the pigment. Such a resin is soluble in an aqueous solution in which an amine or a base is dissolved and has a weight average molecular weight of 3,000 to 30,000.
More preferably, 5000 to 15000 polymers can be used. Specifically, for example, lignin sulfonate,
Natural polymers such as shellac, polyacrylic acid, styrene-
Acrylic acid copolymers, styrene-acrylic acid-ethyl acrylate copolymers and other styrene-acrylic acid-acrylic acid alkyl ester copolymers, styrene-maleic acid copolymers, styrene-maleic acid-acrylic acid alkyl ester copolymers Polymer, styrene-methacrylic acid copolymer,
Styrene-methacrylic acid-acrylic acid alkyl ester copolymer, styrene-maleic acid half ester copolymer, vinylnaphthalene-acrylic acid copolymer, vinylnaphthalene-maleic acid copolymer, styrene-maleic anhydride-maleic acid Examples thereof include half-ester copolymers and salts of the above copolymers.

The content of these water-soluble resins is such that the weight ratio of the pigment to the water-soluble resin is in the range of 10: 3 to 10: 0.1, preferably 10: 3 to 10: 0.2. It is desirable that the amount of the water-soluble resin dissolved in the recording liquid is 2% or less, preferably 1% or less of the total weight of the recording liquid. When the amount of the pigment is more than the above range, the dispersion stability is deteriorated and the sedimentation of the pigment occurs. On the contrary, when the amount of the pigment is less than the above range, the foaming property of the recording liquid is deteriorated and the thin film resistor upon pulse application is deteriorated. Stable discharge cannot be obtained for a long period of time because insoluble matter accumulates in it.

A suitable aqueous medium for the recording liquid of the present invention is water or a mixed solvent of water and a water-soluble organic solvent.
Water is not ordinary water containing various ions,
It is preferable to use ion-exchanged water or deionized water,
Its content is 10 to 60% by weight based on the total amount of recording liquid
It is more preferably in the range of 10 to 50% by weight.

Examples of the water-soluble organic solvent include polyhydric alcohols and aliphatic monohydric alcohols.

The polyhydric alcohol may be used in the form of alcohol or the form of alkyl ether. Specifically, for example, polyalkylene glycols such as polyethylene glycol and polypropylene glycol; ethylene glycol, propylene glycol, butylene glycol,
Alkylene glycols having an alkylene group of 2 to 6 carbon atoms such as triethylene glycol, 1,2,6-hexanetriol, thiodiglycol, hexylene glycol and diethylene glycol; glycerin; ethylene glycol monomethyl (or ethyl) ether And lower alkyl ethers of polyhydric alcohols such as diethylene glycol methyl (or ethyl) ether and triethylene glycol monomethyl (or ethyl).

The content of these polyhydric alcohols and / or their alkyl ethers is in the range of 10 to 50% by weight, more preferably 20 to 40% by weight, based on the recording liquid. If the content is less than 10% by weight, it is not sufficient to prevent clogging at the nozzle tip, and if it exceeds 50% by weight, the print quality of the printed matter deteriorates.

As the aliphatic monohydric alcohol, for example,
Examples thereof include alkyl alcohols having 1 to 4 carbon atoms such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol and tert-butyl alcohol.

Of these, ethyl alcohol or isopropyl alcohol is particularly preferable because it greatly improves the ejection stability of the recording liquid.

The content of the aliphatic monohydric alcohol is in the range of 3 to 15% by weight, more preferably 3 to 10% by weight, based on the recording liquid. A stable discharge cannot always be obtained against changes, and if it exceeds 15% by weight, the print quality of the printed matter tends to be impaired.

The main components constituting the recording liquid of the present invention are as described above, and if necessary, a water-soluble organic solvent,
You may use surfactants, pH adjusters, antifoaming agents, preservatives and the like.

Water-soluble organic solvents that can be used include amides such as dimethylformamide and dimethylacetamide; ketones or keto alcohols such as acetone and diacetone alcohol; ethers such as tetrahydrofuran and dioxane; N-methyl-2- Examples include pyrrolidone and 1,3-dimethyl-2-imidazolidinone.

Of these many water-soluble organic solvents, organic amines are effective as neutralizing agents for water-soluble resins, and amines added to the dispersion include monoethanolamine, diethanolamine, triethanolamine, aminomethyl. Organic amines such as propanol and ammonia are preferred. Further, a base may be used as a neutralizing agent for the water-soluble resin, in which case sodium hydroxide, lithium hydroxide,
Inorganic alkaline agents such as hydrates of alkali metal salts such as potassium hydroxide are preferred.

As the surface active agent, anionic surface active agents such as fatty acid salts, higher alcohol sulfuric acid ester salts, liquid fatty acid sulfuric acid ester salts, alkylallyl sulfonates, polyoxyethylene alkyl ethers, polyoxyethylene alkyl esters, etc. , Nonionic surfactants such as polyoxyethylene sorbitan alkyl esters, and one or more of these can be appropriately selected and used. The amount used varies depending on the dispersant, but is preferably 0.01 to 5% by weight with respect to the total amount of the ink. On this occasion,
It is preferable to determine the amount of the activator added so that the surface tension of the recording liquid is 35 dyne / cm or more. The reason why the surface tension of the recording liquid is smaller than this value causes an unfavorable situation such as printing deviation (deviation of ink droplet landing point) due to the wetting of the nozzle tip in the recording method of the present invention. Because.

Examples of the pH adjusting agent include various organic amines such as diethanolamine and triethanolamine, inorganic alkali agents such as alkali metal hydroxides such as sodium hydroxide, lithium hydroxide and potassium hydroxide, and organic agents. Examples include acids and mineral acids.

Hereinafter, a method for producing a recording liquid using the above components will be exemplified.

In the case of a recording liquid which is colored by a dye,
Dye, water and water-soluble organic solvent are mixed, and then pressure filtered with a Teflon filter having an average particle size of 0.45 μm,
Deaeration is performed to obtain ink.

In the case of a recording liquid which is colored by a pigment,
First, an aqueous solution containing at least a water-soluble resin as a dispersant, an amine or a base, and water is prepared. Next, this aqueous solution is heated to 70 ° C. to completely dissolve the water-soluble resin. At this time, if the concentration of the resin to be dissolved is low, it may not be completely dissolved. Therefore, when dissolving the resin, a high-concentration solution may be prepared in advance and diluted to prepare a desired resin solution.

Next, a pigment and an aliphatic monohydric alcohol (ethanol or the like) are added to this solution, premixing is performed, and then a dispersion treatment is performed. Any generally-used disperser may be used for the dispersion treatment, and for example, a ball mill using ceramic balls or steel balls, a roll mill, a sand mill using glass beads, ceramic beads, and zirconium beads is used.

Among the above dispersers, a high speed type sand mill is particularly preferable, and examples thereof include a super mill, a sand grinder, a bead mill, an agitator mill, a grain mill, a dyno mill, a pearl mill, and a cobol mill (all are trade names). As beads used in the sand mill, glass beads, ceramic beads, and zirconium beads having a diameter of 1 mm to 1.5 mm are used.

In the present invention, as a method for obtaining a pigment having a desired particle size distribution, the size of the grinding media of the disperser is reduced, and the packing ratio of the grinding media is increased.
In addition, methods such as prolonging the processing time, slowing the discharge speed, and classifying with a filter or a centrifuge after crushing are used. Or the combination of those methods is mentioned.

An example of the conditions for preparing the recording liquid dispersion of the present invention is shown below.

Disperser: Sand grinder (made by Igarashi Machinery) Grinding media: Glass beads or zirconium beads 1 mm diameter Grinding media filling rate: 50% (volume) Grinding time: 3 to 4 hours Centrifugation treatment (12000 RPM, 15 to 15) For 20 minutes) to remove coarse particles to obtain a particle size of 100 nm to 20
Make a dispersion of 0 nm. In addition to this, a pearl mill (manufactured by Ashizawa, discharge rate: 100 ml / min) may be used as a disperser. It is desirable that the total amount of the pigment and the water-soluble resin in the dispersion liquid is 5 to 30% or more, preferably 10 to 30% or less on a weight basis. The reason for this is that unless the pigment and the water-soluble resin having a certain concentration or more are present in the dispersion liquid, the dispersion cannot be performed efficiently and the optimum dispersion state cannot be obtained. Next, a water-soluble organic solvent, ion-exchanged water, and the like are mixed with this dispersion liquid to prepare a stirring ink for 1 hour.

Although a typical method for producing a recording liquid has been described above, the present invention is not limited to the above method.

Next, the color image forming method of the present invention using the above recording liquid will be described. The ink of the present invention is
It is particularly suitable for an inkjet recording method in which droplets are ejected for recording by the action of heat energy, but it goes without saying that it can also be used for general writing instruments.

The present invention forms a color image by an ink jet system using at least three colors of ink as described above. As the ink jet system, any conventionally known system can be used, but it is particularly preferable. The method uses heat energy, which satisfies ejection stability and enables excellent color image recording.

A recording apparatus suitable for recording using the ink of the present invention is an apparatus for applying thermal energy corresponding to a recording signal to the ink in the chamber of the recording head and generating droplets by the energy. Be done.

An example of the head structure, which is the main part, is shown in FIGS. The head 13 is a glass, ceramics, or plastic plate having a groove 14 through which ink passes, and a heating head 15 used for heat-sensitive recording (thin film is shown in the drawing, but not limited to this). It is obtained by bonding and. The heating head 15 includes a protective film 16 made of silicon oxide or the like, an aluminum electrode 17-
1 and 17-2, a heating resistor layer 18 made of nichrome, a heat storage layer 19, and a substrate 20 having a good heat dissipation property such as alumina.

The ink 21 has a discharge orifice (fine hole) 2
It is filled up to 2, and the pressure P forms the meniscus 23. Now, when an electric signal is applied to the electrodes 17-1 and 17-2, the area indicated by n of the heating head 15 rapidly generates heat, and bubbles are generated in the ink 21 in contact therewith, and the meniscus 23 is generated by the pressure. Is ejected and ink 2
1 is ejected and becomes a recording droplet 24 from the orifice 22 and flies toward the recording medium 25. FIG. 3 shows an external view of a multi-head in which many heads shown in FIG. 1 are arranged. The multi-head is made by bonding a glass plate 27 having multi-grooves 26 and a heating head 28 similar to that described in FIG. Incidentally, FIG. 1 shows the head 13 along the ink flow path.
2 is a sectional view taken along line AB of FIG. 1.

FIG. 4 shows an example of an ink jet recording apparatus incorporating this head. In FIG. 4, reference numeral 61 denotes a blade as a wiping member, one end of which is held by a blade holding member to become a fixed end, which is in the form of a cantilever. The blade 61 is arranged at a position adjacent to the recording area of the recording head, and in the case of this example, it is held in a protruding form in the moving path of the recording head. 6
Reference numeral 2 denotes a cap, which is arranged at a home position adjacent to the blade 61, and has a configuration in which it moves in a direction perpendicular to the moving direction of the recording head and comes into contact with the ejection surface to perform capping. Further, 63 is an ink absorber provided adjacent to the blade 61, and like the blade 61, is held in a form protruding in the moving path of the recording head. The blade 61, the cap 62, and the absorber 63 form an ejection recovery unit 64, and the blade 61 and the absorber 63 remove water, dust, and dust from the ink ejection port surface. Reference numeral 65 denotes a recording head which has an ejection energy generating means and ejects ink to a recording material facing the ejection port surface where the ejection ports are arranged to perform recording, and 66 denotes a recording head 65 mounted to move the recording head 65. It is a carriage for performing. The carriage 66 slidably engages with a guide shaft 67, and a part of the carriage 66 is connected to a belt 69 driven by a motor 68 (not shown). As a result, the carriage 66 can move along the guide shaft 67, and the recording head 65 can move the recording area and its adjacent area.

Reference numeral 51 is a paper feed section for inserting a recording material, and 52 is a paper feed roller driven by a motor (not shown). With these configurations, the recording material is fed to a position facing the ejection port surface of the recording head, and is ejected to a paper ejection unit provided with a paper ejection roller 53 as the recording progresses.

In the above structure, when the recording head 65 returns to the home position after recording is completed, the head recovery unit 6
The fourth cap 62 is retracted from the movement path of the recording head 65, but the blade 61 is projected in the movement path. As a result, the ejection port surface of the recording head 65 is wiped. When the cap 62 comes into contact with the ejection surface of the recording head 65 to perform capping, the cap 62 moves so as to project into the moving path of the recording head.

When the recording head 65 moves from the home position to the recording start position, the cap 62 and the blade 61 are at the same position as the above-mentioned position during wiping. As a result, even in this movement, the ejection port surface of the recording head 65 is wiped. The above-described movement of the recording head to the home position is performed not only at the end of recording or at the time of ejection recovery, but also at the home position adjacent to the recording area at a predetermined interval while the recording head moves in the recording area for recording. However, the wiping is performed along with this movement.

FIG. 5 shows an ink cartridge 4 containing ink to be supplied to the head through an ink supply tube.
5 is a cross-sectional view showing an example of No. 5 of FIG. Here, 40 is an ink bag containing the supply ink, and a rubber stopper 42 is provided at the tip thereof. By inserting a needle (not shown) into this stopper 42, the ink in the ink bag 40 can be supplied to the head. An ink absorber 44 receives the waste ink.

The ink jet recording apparatus used in the present invention is not limited to the one in which the head and the ink cartridge are separated as described above, and one in which they are integrated as shown in FIG. 6 is also preferable. Used for. In FIG. 6, an ink jet cartridge 70 contains an ink absorber impregnated with ink, and the ink in the ink absorber is converted into ink droplets from a head portion 71 having a plurality of orifices. It is configured to be discharged. Reference numeral 72 denotes an atmosphere communication port for communicating the inside of the cartridge with the atmosphere. The inkjet cartridge 70 is used in place of the recording head 65 shown in FIG. 4, and is detachable from the carriage 66.

The recording material that can be used in the method of the present invention is not only various types of inkjet recording papers that have been proposed in the past or plastic sheets for OHP, but also plain paper (paper that is normally used in offices). Even if used, excellent recording is naturally possible. The image is excellent in water resistance, light resistance and ozone resistance regardless of the recording material.

[0072]

The present invention will be described in more detail with reference to the following examples. Unless stated otherwise, parts or percentages are by weight. Examples 1 to 3 Recording liquids exhibiting each color of yellow, magenta, cyan and black were prepared by the above-mentioned method with the compounding ratios shown in Table 1.

[0073]

[Table 1] In Table 1, resins A, B, and C represent water-soluble resins composed of styrene, acrylic acid, and ethyl acrylate copolymer, and their compositions are as follows.

─────────────────────── Styrene: acrylic acid: ethyl acrylate ──────────────── ─────── A 59: 28.5: 12.5 B 53: 27: 20 C 59: 28.5: 12.5 ─────────────────────── Also, The acid value and molecular weight of Resins A, B and C are as follows.

[0075] Next, a fastness test was conducted on each of the prepared color recording liquids in the following manner. (1) Light resistance: BJC-440 (manufactured by Canon) was used as a printer, and after printing on coated paper (color bubble jet copier paper, manufactured by Canon), it was left for 24 hours, and further tested by an atlas fade meter for 100 hours. , The difference in chromaticity of the image before and after the test, ΔE ^* _ab, can be calculated according to JIS-Z87.
The light resistance was evaluated by the method 301. The smaller the value, the better the light resistance. (2) Ozone resistance: BJC-440 as a printer
(Manufactured by Canon), coated paper (color bubble jet copier paper, manufactured by Canon) and allowed to stand for 24 hours after printing, a further 2 hours (3ppm) test in the ozone fade meter, light resistance as well as △ E ^* _ab The ozone resistance was evaluated. The test results are shown in Table 2.

[0076]

[Table 2] Comparative Example 4 color recording liquids were prepared in the same manner as in the example except that the composition of the recording liquids showing each color of yellow, magenta, cyan and black was changed as shown in Table 1, and the fastness test was conducted. .. The results are shown in Table 2.

From Table 2, in terms of water resistance, light resistance and ozone resistance, the color image produced by the ink and recording method of the present invention is very excellent, and Y, M, C, Bk.
It can be seen that the characteristics of are also uniform.

[0078]

As described above, according to the present invention, the pigments used in the aqueous inks of the three primary colors of magenta, yellow, and cyan used in the present invention are all in the same level in the solvate. It is suitable for color image recording because it has excellent dispersion stability and storage stability. In particular, it has excellent suitability as a water-based ink of a general inkjet system, and particularly has ejectability in a BJ system, and has excellent water resistance, light resistance, and ozone resistance in which all pigments are well balanced in coated paper. Since it has sharpness, mutual color rendering, etc., and even on plain paper, all pigments have excellent balance of water resistance, sharpness, mutual color rendering, etc., so that a color image of excellent quality is provided. You can

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a recording head according to an inkjet recording method of the present invention.

FIG. 2 is a schematic cross-sectional view showing a cross section taken along the line AB of FIG.

FIG. 3 is a schematic external view showing an example of a multi-head in which a large number of heads in FIG. 1 are arranged.

FIG. 4 is a schematic perspective view showing an example of an ink jet recording apparatus incorporating the same head.

FIG. 5 is a schematic cross-sectional view showing an example of an ink cartridge that supplies ink to the head.

FIG. 6 is a schematic external view showing an example of a main part of an inkjet recording apparatus in which the same head and the same ink cartridge are integrated.

[Explanation of symbols]

 13 head 14 ink groove 15 heating head 16 protective film 17 aluminum electrode 18 heating resistor layer 19 heating layer 20 substrate 21 ink 22 ejection orifice 23 meniscus 24 recording liquid droplet 25 recording material 26 multi-groove 27 glass plate 28 heating head 40 Ink bag 42 Plug 44 Ink absorber 45 Ink cartridge 51 Paper feed unit 52 Paper feed roller 53 Paper discharge roller 61 Blade 62 Cap 63 Ink absorber 64 Discharge recovery unit 65 Recording head 66 Carriage 67 Guide shaft 68 Motor unit 69 Belt 70 Inkjet Cartridge 71 Head 72 Atmosphere communication port

Claims (3)

[Claims] 1. A color image forming method for forming a color image by applying at least yellow, magenta, and cyan color inks to a recording material, wherein the yellow ink is represented by the following general formula (I): (However, A in the formula (I) is -NHCONH- or Represents a bond, X ₁ and X ₂ represent —SO ₃ M, —COOM or a phenyl group which may be substituted with a hydroxyl group and a naphthyl group, R represents a methyl group or a methoxy group, and n represents 0 or 1. , M represents an alkali metal, ammonium or an organic amine. ) At least one of the compounds represented by the formula (1) is contained as a dye, and the magenta ink is
CIPigment Red 5, CIPigment Red 7, CIPigment
Red 12, CIPigment Red 48 (Ca), CIPigment Red 48
(Mn), CIPigment Red 57 (Ca), CIPigment Red 112,
At least one selected from CIPigment Red 122
C., and the cyan ink contains C.I. I. Reactive Blue 14, C.I. I. Reactive blue 1
5, C.I. I. Reactive Blue 63, C.I. I. Reactive Blue 41, C.I. I. Reactive blue 22
7, C.I. I. Reactive Blue 279, C.I. I. Direct Blue 86 and C.I. I. Direct Blue 199
A method for forming a color image, comprising at least one dye selected from the group consisting of: 2. The color image forming method according to claim 1, wherein a black ink containing at least carbon black is further applied to the recording material in the previous period to form a color image. 3. An ink jet recording method in which thermal energy is applied to a recording liquid and the liquid is ejected as droplets from fine holes to perform recording, wherein the recording liquid is according to claim 1 or 2.
A color image forming method by an ink jet recording method, which comprises a dye or a pigment.