Ink storage body and recording method

Abstract

To provide an ink storage body storing an inkjet ink composition having excellent discharge stability.SOLUTION: There is provided an ink storage body having an inkjet ink composition and a container for storing the inkjet ink composition, wherein the inkjet ink composition is an aqueous ink containing a pigment and a surfactant, the pigment includes at least two pigments having different chemical structure classifications, the surfactant includes a polysiloxane-based surfactant having an HLB value of 10 or more and an acetylene glycol-based surfactant having an HLB value of 6 or more and 10 or less and the amount of dissolved nitrogen in the stored inkjet ink composition is 5 ppm or more.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an ink container and a recording method. [Background technology]

[0002] Inkjet recording methods are capable of recording high-definition images with a relatively simple device, and have made rapid advances in various fields. In particular, various studies have been conducted on improving color reproducibility using water-based inks. For example, Patent Document 1 discloses an ink set that uses an ink composition in which two or more pigments are mixed in order to obtain a desired hue. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-297596 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when recording is performed using an ink composition containing two or more types of pigments having different chemical structure classifications, such as the ink composition described in Patent Document 1, there is a problem that the ejection stability is poor depending on the type of ink container or how the ink container containing the ink composition is handled. [Means for solving the problem]

[0005] The ink container of the present invention is an ink container having an ink-jet ink composition and a container for storing the ink-jet ink composition, wherein the ink-jet ink composition is a water-based ink containing a pigment and a surfactant, the pigment comprises at least two types of pigments having different chemical structure classifications, the surfactant comprises a polysiloxane-based surfactant having an HLB value of 10 or more and an acetylene glycol-based surfactant having an HLB value of 6 or more and 10 or less, and the amount of dissolved nitrogen in the stored ink-jet ink composition is 5 ppm or more.

[0006] The recording method of the present invention includes a deposition step of ejecting the ink-jet ink composition supplied from the ink container described above from an ink-jet head and depositing it onto a recording medium. [Brief description of the drawings]

[0007] [Figure 1] Table 1 shows the conditions and evaluation results of the examples. [Diagram 2] Table 2 shows the conditions and evaluation results of the examples. [Diagram 3] Table 3 shows the conditions and evaluation results of the examples. [Figure 4] Table 4 shows the conditions and evaluation results of the examples. [Diagram 5] Table 5 shows the conditions and evaluation results of the examples. [Figure 6] 1A and 1B are diagrams illustrating an ink pack as an example of a container according to an embodiment of the present invention. [Figure 7] 1A and 1B are diagrams showing an ink bottle as an example of a container according to an embodiment of the present invention. [Figure 8] FIG. 2 is a diagram illustrating an example of a printing apparatus used in the printing method of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention (hereinafter referred to as "the present embodiment") will be described in detail with reference to the drawings as necessary, but the present invention is not limited to this, and various modifications are possible without departing from the gist of the present invention. In the drawings, the same elements are given the same reference numerals, and duplicated explanations will be omitted. Furthermore, positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings, unless otherwise specified. Furthermore, the dimensional ratios of the drawings are not limited to those shown in the drawings.

[0009] 1. Ink container The ink container according to this embodiment is an ink container having an inkjet ink composition (hereinafter also simply referred to as the "ink composition") and a container for storing the inkjet ink composition, the inkjet ink composition being an aqueous ink containing a pigment and a surfactant, the pigment comprising at least two types of pigments having different chemical structure classifications, the surfactant comprising a polysiloxane-based surfactant having an HLB value of 10 or more and an acetylene glycol-based surfactant having an HLB value of 6 or more and 10 or less, and the amount of dissolved nitrogen in the stored inkjet ink composition being 5 ppm or more.

[0010] When preparing a pigment dispersion or an ink composition, fine bubbles may remain on the surface of the pigment particles. Such fine bubbles grow and are released into the ink composition away from the pigment, generating bubbles in the ink composition, which causes poor discharge. The growth of fine bubbles is promoted by gas components such as dissolved nitrogen dissolved in the ink. Therefore, the type and amount of surfactant and organic solvent are adjusted according to the hydrophilicity and hydrophobicity, unevenness, and smoothness of the pigment used to increase the wettability of the pigment surface and prevent fine bubbles from remaining.

[0011] However, multiple types of pigments may be used to obtain a desired color for one water-based ink. Pigments with different chemical structure classifications have different hydrophilicity and hydrophobicity, and different unevenness and smoothness of the plane due to their chemical structures. Therefore, it is difficult to uniquely determine the ink composition to increase the wettability of the pigment surface and prevent fine air bubbles from remaining. For this reason, it has been difficult to improve the ejection stability of water-based inks containing two or more pigments with different chemical structure classifications.

[0012] In response to this, it is conceivable that the use of a container with high gas barrier properties would prevent the concentration of gas components dissolved in the ink from becoming high, thereby inhibiting the growth of fine bubbles. However, even if such a container is used, it is difficult to prevent air from dissolving depending on how the ink composition is handled.

[0013] Therefore, in this embodiment, by containing a polysiloxane-based surfactant with a high HLB value and an acetylene glycol-based surfactant with a low HLB value, the wettability of the pigment surface is improved, fine bubbles are prevented from being adsorbed on the pigment surface, and the decrease in ejection stability due to the growth of fine bubbles is prevented, making it possible to provide an ink composition with excellent ejection stability even when the amount of dissolved nitrogen in the ink composition is 5 ppm or more. However, the factors are not limited to the above. The components that constitute the ink container will be described in detail below.

[0014] 1.1. Inkjet ink composition The inkjet ink composition according to this embodiment is a water-based ink containing a pigment and a surfactant, the pigment including at least two types of pigments having different chemical structure classifications, and the surfactant including a polysiloxane-based surfactant having an HLB value of 10 or more and an acetylene glycol-based surfactant having an HLB value of 6 or more and 10 or less. By forming the ink composition into the above composition, the ink container has excellent ejection stability.

[0015] 1.1.1.Pigments The ink composition contains at least two pigments having different chemical structure classifications. Here, in this specification, the term "different chemical structure classifications" refers to the fact that pigments having a common chemical structure such as a functional group are classified by a person skilled in the art into different chemical structure classifications. Specifically, pigments classified into azo compounds, quinacridone compounds, dioxazine compounds, perinone compounds, perylene compounds, diketopyrrolopyrrole compounds, isoindolinone compounds, and threne compounds correspond to pigments having different chemical structure classifications. The ink of this embodiment contains at least two pigments selected from the group consisting of pigments belonging to these classifications, such as a combination of azo compounds and quinacridone compounds. On the other hand, when two azo compounds having different structures are contained as pigments, this does not mean that the ink of this embodiment "contains at least two pigments having different chemical structure classifications". By containing these pigments, ejection defects due to air bubbles are particularly likely to occur, and the effect of the present invention tends to be more pronounced. Note that only two pigments may be used, or three or more pigments may be used.

[0016] In this embodiment, the ink preferably contains a first pigment compound which is an azo-based compound, and at least one second pigment compound selected from the group consisting of quinacridone-based compounds, dioxazine-based compounds, perinone-based compounds, perylene-based compounds, and diketopyrrolopyrrole-based compounds. In this case, it is preferable because the range of recordable hue angles is wide. On the other hand, the first pigment compound has high pigment particle planarity, while the second pigment compound has low pigment particle planarity. Therefore, by including such a compound as a pigment, the two pigments become more different, and ejection failures due to air bubbles are more likely to occur, and the effect of the present invention tends to be more pronounced. In addition, storage stability also tends to be improved. From the same viewpoint, it is more preferable that the second pigment compound contains at least one of a perinone compound and a quinacridone compound. It is preferable to contain the first pigment compound which is an azo compound in terms of excellent color development. When the second pigment compound contains a perinone compound, the ejection stability is more excellent, which is preferable. Even when a quinacridone compound is contained as the second pigment compound, the present embodiment is useful because it provides ejection stability and storage stability.

[0017] In this embodiment, the hue of the ink composition is preferably yellow-red, which includes yellow ink, orange ink, magenta ink, red ink, and the like, and is ink that is primarily used when recording warm colors. For example, a print made by applying each ink alone to a print medium is called a CIEL * a * b * When measured in a color space, this ink has a hue angle between the hue angle of a recorded work made with yellow ink and the hue angle of a recorded work made with magenta ink (including 0°). The recorded work when the color is measured is a recorded work in which the surface of the part to be measured of the white recording medium is completely covered with ink. It can also be said that this ink is between yellow ink and magenta ink in terms of hue angle.

[0018] Warm colors are required to be recorded in a variety of colors, and it is sometimes difficult to prepare the desired color using only one type of pigment. Therefore, multiple pigments are often used. In such a combination of pigments constituting a yellow-red ink, ejection failure due to air bubbles is particularly likely to occur, and the effect of the present invention tends to be more pronounced. In addition, storage stability also tends to be improved. Among them, yellow-red inks other than yellow ink are more preferable, such as orange ink, magenta ink, and red ink. These are also called red inks. In addition, among the yellow-red inks, it is also preferable to use them as special color inks. The special color inks of the yellow-red inks are inks other than the basic colors of the yellow-red inks, yellow ink and magenta ink. On the other hand, among the yellow-red inks, it is also preferable to use them as basic color inks. The basic colors of the yellow-red inks are yellow ink and magenta ink. In the case of these inks, the effects of the present invention are more pronounced and more preferable.

[0019] The content of the first pigment compound, which is an azo compound, relative to the total amount of the ink composition is preferably 0.1% by mass to 5.0% by mass, 0.5% by mass to 4.0% by mass, or 0.7% by mass to 3.0% by mass, and more preferably 1.0% by mass to 2.0% by mass. By setting the content of the first pigment compound within the above range, there is a tendency that the ejection stability and storage stability can be improved more reliably.

[0020] The content of the second pigment compound is preferably from 0.5% to 5.0% by mass, more preferably from 1.0% to 4.0% by mass, and even more preferably from 2.0% to 3.5% by mass, based on the total amount of the ink composition. By setting the content of the second pigment compound within the above range, there is a tendency that the ejection stability and storage stability can be improved more reliably.

[0021] Examples of azo compounds (azo pigments) include CI Pigment Yellow 1, 3, 4, 6, 12, 14, 17, 55, 62, 65, 73, 74, 81, 83, 95, 97, 104, 117, 120, 128, 129, 150, 151, 154, 155, 167, 174, 180, 185, and 213 as pigments used in yellow inks, and CI Pigment Red 1, 3, 4, 6, 12, 14, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 65, 73, 74, 81, 83, 95, 97, 104, 117, 120, 128, 129, 150, 151, 154, 155, 167, 174, 180, 185, and 213 as pigments used in magenta inks. Red) 1, 2, 3, 4, 5, 7, 9, 12, 17, 23, 48(Mn), 48(Ca), 48:1, 48:2, 57(Ca), 57:1, 112, 114, 144, 146, 150, 166, 175, 176, 184, 192, 206, 207, 282, 242, and the pigment used in the orange ink includes CI Pigment Orange 1, 5, 13, 16, 34, 36, 60, 61, 62, 64, 67, 72. From the viewpoint of more effectively and reliably achieving the present invention, it is preferable to use the above PR150 and / or PR242. It is preferable to use the above pigments in yellow-red inks, but the inks to which the pigments can be used are not limited to those mentioned above, and the above are merely examples. The same applies to the following pigments.

[0022] The content of the azo compound is preferably from 0.1% to 5.0% by mass, from 0.5% to 4.0% by mass, or from 1.0% to 3.0% by mass, based on the total amount of the ink composition. By setting the content of the azo compound within the above range, ejection stability and storage stability tend to be further improved.

[0023] Examples of quinacridone compounds (quinacridone pigments) include CI Pigment Red 122, 202, 206, 207, and 209, CI Pigment Violet 19, and CI Pigment Orange 48 and 49. From the viewpoint of achieving the present invention more effectively and reliably, it is preferable to use the above-mentioned PR122.

[0024] The content of the quinacridone compound is preferably from 0.1% by mass to 5.0% by mass, and more preferably from 0.5% by mass to 3.0% by mass, based on the total amount of the ink composition. By setting the content of the quinacridone compound within the above range, ejection stability and storage stability tend to be further improved.

[0025] An example of the perinone compound (perinone pigment) is Perinone Orange 43. From the viewpoint of achieving the present invention more effectively and reliably, it is preferable to use the above-mentioned PO43.

[0026] The content of the perinone compound is preferably from 1.0% to 5.0% by mass, and more preferably from 2.0% to 4.0% by mass, relative to the total amount of the ink composition. By setting the content of the perinone compound within the above range, ejection stability tends to be further improved.

[0027] Examples of dioxazine-based compounds (dioxazine-based pigments) include CI Pigment Blue 80, CI Pigment Violet 23, 37, and the like.

[0028] Examples of perylene-based compounds (perylene-based pigments) include CI Pigment Red 123, 149, and 178.

[0029] Examples of diketopyrrolopyrrole compounds (diketopyrrolopyrrole pigments) include CI Pigment Red 254, 255, 164, 270, 272, 283, and the like.

[0030] The total content of the pigment in the ink composition is preferably 0.5% by mass to 10% by mass, 1.0% by mass to 8.0% by mass, or 3.0% by mass to 5.0% by mass, based on the total amount of the ink composition. By setting the total content of the pigment within the above range, ejection stability and storage stability tend to be further improved.

[0031] It is preferable that the pigment can be stably dispersed in the dispersion medium, and therefore a dispersant may be used for dispersion. Examples of the dispersant include a surfactant and a dispersant resin, which is a resin. The dispersant is selected from those that can improve the dispersion stability of the pigment in the ink composition. Examples of the dispersant resin include an acrylic resin, a urethane resin, and a maleic resin. The acrylic resin may be a resin polymerized using at least an acrylic monomer, and may be a copolymer of an acrylic monomer and another monomer.

[0032] A pigment dispersed using a resin is also called a resin-dispersed pigment. The resin-dispersed pigment may be a pigment dispersed using a resin. The dispersant resin may be a water-soluble resin or a water-insoluble resin. The pigment may be used as a self-dispersing pigment by modifying the surface of the pigment particles by, for example, oxidizing the pigment surface with ozone, hypochlorous acid, fuming sulfuric acid, or the like, or by introducing a hydrophilic functional group. Examples of the hydrophilic functional group to be introduced include a carboxyl group, a sulfo group, and a phosphorus-containing group.

[0033] Surfactants The ink composition contains at least a polysiloxane-based surfactant having an HLB value of 10 or more (hereinafter simply referred to as a "polysiloxane-based surfactant") and an acetylene glycol-based surfactant having an HLB value of 6 or more and 10 or less (hereinafter simply referred to as an "acetylene glycol-based surfactant"). By containing these surfactants in the ink composition, the ink container has excellent ejection stability. The above two types of surfactants may be used alone, or three or more types may be used.

[0034] In this specification, the HLB (Hydrophile-Lipophile Balance) value of a surfactant is a value proposed by Davis et al. to evaluate the hydrophilicity of a compound, and is, for example, a numerical value determined by the Davis method defined in the literature "JT. Davies and E. K. Rideal, "Interface Phenomena" 2nd ed. Academic Press, New York 1963", and indicates a value calculated by the following formula (i). HLB value = 7 + Σ[1] - Σ[2] (i) (In formula (i), [1] represents the number of hydrophilic groups, and [2] represents the number of hydrophobic groups.)

[0035] Commercially available polysiloxane compounds include, for example, BYK-306, BYK-307, BYK-333, BYK-341, BYK-345, BYK-346, BYK-348 (all trade names, manufactured by BYK Japan), KF-351A, KF-352A, KF-353, KF-354L, KF-355A, KF-615A, KF-945, KF-640, KF-642, KF-643, KF-6020, X-22-4515, KF-6011, KF-6012, KF-6015, and KF-6017 (all trade names, Examples of such fluids include FZ-2104 Fluid, FZ-2105, FZ-2110, FZ-2123, FZ-2164, FZ-2191, FZ-5609 Fluid, L-7001, L-7002, L-7604, OFX-0309 Fluid, OFX-5211 Fluid, SF8410 Fluid, OFX-0193 Fluid, SH-3746 Fluid, SH-3771 Fluid, SH-8400 Fluid, SH-8700 Fluid, and Y-7006 (all manufactured by Dow Corning Toray Co., Ltd.). However, of the above, those with an HLB value of 10 or more should be used. The HLB value can be calculated using the Davis method described above. In order to more effectively and reliably achieve the present invention, it is preferable to use at least one of the above-mentioned KF-640 and FZ-2105.

[0036] The content A of the polysiloxane surfactant is preferably from 0.1% by mass to 5.0% by mass, from 0.2% by mass to 2.0% by mass, or from 0.3% by mass to 1.5% by mass, based on the total amount of the ink composition. By setting the content of the polysiloxane surfactant within the above range, ejection stability tends to be further improved.

[0037] Examples of acetylene glycol surfactants include Surfynol 104, 104E, 104H, 104A, 104BC, 104DPM, 104PA, 104PG-50, 104S, 420, 440, 465, 485, SE, SE-F, 504, 61, DF37, CT111, CT121, CT131, CT136, TG, GA, and DF110D (all trade names, manufactured by Air Products & Chemicals Co.), Orfi Examples of such terpenes include B, Y, P, A, STG, SPC, E1004, E1010, PD-001, PD-002W, PD-003, PD-004, EXP.4001, EXP.4036, EXP.4051, AF-103, AF-104, AK-02, SK-14, AE-3 (all trade names, manufactured by Nissin Chemical Industry Co., Ltd.), Acetylenol E00, E00P, E40, E100 (all trade names, manufactured by Kawaken Fine Chemical Co., Ltd.). However, among the above, those with an HLB value of 6 to 10 are used. The HLB value can be determined by the above-mentioned Davis method. In order to more effectively and reliably achieve the present invention, it is preferable to use at least one of the above-mentioned Surfynol 440 and Surfynol SE.

[0038] The content B of the acetylene glycol surfactant is preferably 0.05% by mass or more and 3.0% by mass or less, and more preferably 0.1% by mass or more and 1.0% by mass or less, based on the total amount of the ink composition. By setting the content of the acetylene glycol surfactant within the above range, ejection stability tends to be further improved.

[0039] The mass ratio (A / B) of the polysiloxane surfactant content A to the acetylene glycol surfactant content B is 0.3 to 8.0, preferably 0.5 to 7.5. More preferably, it is 1.2 to 4.0, even more preferably 1.5 to 3.0, and particularly preferably 2.0 to 2.8. By keeping A / B within the above range, ejection stability and storage stability tend to be improved more reliably.

[0040] In addition, the ink composition of the present embodiment may contain other surfactants such as fluorine-based surfactants in addition to the polysiloxane-based surfactant and the acetylene glycol-based surfactant. Examples of such fluorine-based surfactants include BYK-3440 (manufactured by BYK Japan), Surflon S-241, S-242, and S-243 (all trade names, manufactured by AGC Seimi Chemical Co., Ltd.), and Futergent 215M (manufactured by Neos Co., Ltd.). In addition, the ink composition may contain polysiloxane-based surfactants and acetylene glycol-based surfactants whose HLB values ​​are outside the above ranges.

[0041] The total content of the surfactants is preferably from 0.1% by mass to 5.0% by mass, from 0.3% by mass to 3.0% by mass, or from 0.4% by mass to 2.0% by mass, relative to the total amount of the ink composition. By keeping the total content of the surfactants within the above range, there is a tendency for the ejection stability to be further improved.

[0042] 1.1.3. Organic Solvents The ink composition of the present embodiment may contain an organic solvent. By containing an organic solvent, the ink composition tends to maintain the ejection stability while suppressing the evaporation of water from the recording head when left for a long period of time. The organic solvent may be used alone or in combination of two or more kinds.

[0043] In particular, the ink composition has an SP value of 9 (cal / cm 3 ) 1 / 2 More than 13.5(cal / cm 3 ) 1 / 2 It is preferable that the ink composition contains an organic solvent having an SP value of 9 (cal / cm 2 ) or less. By setting the SP value of the organic solvent used within the above range, ejection stability and storage stability tend to be improved more reliably. 3 ) 1 / 2 More than 13.5(cal / cm 3 ) 1 / 2 It may contain organic solvents other than the following:

[0044] In this specification, the SP value is expressed as the Hansen solubility parameter. The Hansen solubility parameter is a solubility parameter introduced by Hildebrand, which is divided into three components, the dispersion term δd, the polarity term δp, and the hydrogen bond term δh, and expressed in a three-dimensional space. In the present invention, the SP value is expressed as δ[(cal / cm 3 ) 0.5 ] and the value calculated using the following formula is used. δ[(cal / cm 3 ) 0.5 ]=(δd 2 +δp 2 +δh 2 ) 0.5

[0045] The organic solvent is preferably a water-soluble organic solvent, and examples of such solvents include polyols, glycol ethers, lactams, and alcohols. Polyols are hydrocarbons having two or more hydroxyl groups in the molecule, and examples thereof include triol or higher polyols having three or more hydroxyl groups in the molecule, and glycols. Examples of the glycol ethers include glycol monoethers and glycol diethers. For example, glycerin; glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, 1,3-propanediol, 1,2-butanediol, 1,2-pentanediol, 1,2-hexanediol, 1,3-butanediol, 1,5-pentanediol, and 1,6-hexanediol; ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, and dipropylene glycol monomethyl ether. Examples of the glycol monoethers include dipropylene glycol monoethyl ether, triethylene glycol monomethyl ether, triethylene glycol monobutyl ether, and diethylene glycol monoisobutyl ether; lactam compounds such as 2-pyrrolidone, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, and N-(2-hydroxyethyl)-2-pyrrolidone (HEP); and alcohols such as methanol, ethanol, n-propyl alcohol, isopropyl alcohol, n-butanol, 2-butanol, tert-butanol, iso-butanol, n-pentanol, 2-pentanol, 3-pentanol, and tert-pentanol.

[0046] Among the above organic solvents, triol or higher polyols such as glycerin, glycols, and glycol monoethers are preferred. For example, it is more preferred to use at least one of glycerin (SP value=16.7), propylene glycol (SP value=14.2), 1,2-hexanediol (SP value=12.2), and diethylene glycol monoisobutyl ether (SP value=8.7). SP value is 8.5 (cal / cm 3 ) 1 / 2 More than 17.0(cal / cm 3 ) 1 / 2 It is also preferable to use the following organic solvents: SP value is 8.5 (cal / cm 3 ) 1 / 2More than 17.0(cal / cm 3 ) 1 / 2 Organic solvents having a density of 9 (cal / cm 3 ) 1 / 2 More than 13.5(cal / cm 3 ) 1 / 2 It is also preferable to use the following organic solvents: Acetylene glycol surfactants have low solubility in water, and when the ink composition dries in the ejection nozzle of the inkjet head and the amount of water decreases, ejection failure tends to occur. Therefore, among the above organic solvents, those having an SP value of 9 (cal / cm 3 ) 1 / 2 More than 13.5(cal / cm 3 ) 1 / 2 By using the organic solvent having the following properties, the solubility of the acetylene glycol surfactant in water is improved, and ejection defects tend to be suppressed. Therefore, by using the organic solvent, the ejection stability and storage stability tend to be improved more reliably.

[0047] SP value is 9 (cal / cm 3 ) 1 / 2 More than 13.5(cal / cm 3 ) 1 / 2 The organic solvent content C is preferably 0.1% by mass or more and 20% by mass or less, more preferably 0.5% by mass or more and 15% by mass or less, and even more preferably 1% by mass or more and 15% by mass or less, further preferably 2 to 10% by mass, and more preferably 3 to 8% by mass, based on the total amount of the ink composition. By setting the content C within the above range, there is a tendency that the ejection stability and storage stability can be improved more reliably.

[0048] The mass ratio (B / C) of the acetylene glycol surfactant content B to the organic solvent content C is preferably 0.3 or less, 0.2 or less, or 0.1 or less. By setting the mass ratio B / C within the above range, ejection stability and storage stability tend to be more reliably improved. Moreover, the B / C may be 0.01 or more, or 0.02 or more.

[0049] The total content of the organic solvent in the ink is preferably 0.1 to 25% by mass, more preferably 3.0 to 20.0% by mass, even more preferably 5.0 to 18.0% by mass, and particularly preferably 10.0 to 15.0% by mass. By setting the content within the above range, ejection stability, storage stability, etc. are more excellent, which is preferable.

[0050] 1.1.4.Water Examples of water include pure water such as ion-exchanged water, ultrafiltered water, reverse osmosis water, and distilled water, as well as ultrapure water. The water content is preferably 40% by mass or more relative to the total amount of the ink composition. More preferably, the water content is 45% by mass or more and 98% by mass or less, 50% by mass or more and 95% by mass or less, 55% by mass or more and 90% by mass or less, or 70% by mass or more and 85% by mass or less. The ink-jet ink composition used in this embodiment is a water-based ink. A water-based ink is an ink that contains at least water as a main solvent component of the ink.

[0051] 1.1.5.Other Ingredients The ink composition of this embodiment may contain other components as necessary. Such components are not particularly limited, and examples thereof include a pH adjuster, a preservative, a wetting agent, and a chelating agent.

[0052] The pH adjuster is not particularly limited, but examples thereof include ureas, amines, morpholines, piperazines, and aminoalcohols such as triethanolamine. Among these, triethanolamine is preferred.

[0053] 1.1.6. Method for preparing ink composition The ink composition of the present embodiment is not particularly limited, and may be prepared by mixing the pigment, surfactant, water, and, if necessary, an organic solvent and other components by a known method. The mixing procedure is not particularly limited, and may be, for example, a pigment dispersion liquid may be prepared by mixing the pigment, surfactant, and water, and then the ink composition may be prepared using the pigment dispersion liquid.

[0054] 1.2. Dissolved nitrogen content In the ink container of this embodiment, the amount of dissolved nitrogen in the ink composition is 5 ppm or more. When the amount of dissolved nitrogen is 5 ppm or more, ejection defects due to air bubbles are particularly likely to occur, and the effect of the present invention becomes more pronounced. Furthermore, the amount of dissolved nitrogen in the ink composition is preferably 5 ppm or more and 20 ppm or less, 6 ppm or more and 18 ppm or less, or 8 ppm or more and 15 ppm or less. The amount of dissolved nitrogen tends to vary depending on the method for preparing the ink composition and the material of the container in which the ink composition is stored. The amount of dissolved nitrogen can be measured, for example, by gas chromatography, using a measuring device such as that used in the examples described below.

[0055] 1.3. Container The container for storing the ink composition according to the present embodiment is not particularly limited, and examples thereof include an ink cartridge, an ink pack, an ink bottle, an ink tank, a bottle, and a can. Among these, from the viewpoint of versatility, an ink cartridge, an ink pack, an ink bottle, and an ink tank are preferred. An ink pack and an ink bottle are more preferred. Furthermore, from the viewpoint of controlling gas permeability, an ink pack made of a member having a multilayer structure, or an ink bottle made of a resin is preferred. By using an ink pack or an ink bottle, the effects of the present invention tend to be more effectively and reliably achieved. In addition, in the present embodiment, the ink container refers to a state in which the container stores ink. A member having a multilayer structure is a member having two or more layers, for example, a member having a resin film layer serving as a base material and a gas barrier layer, as described below.

[0056] From the same viewpoint as above, the ink pack has a resin film substrate layer and a gas barrier layer, and the gas barrier layer preferably has at least one of a gas barrier resin layer and a metal or metal compound layer having a thickness of 500 nm or less. On the other hand, those with a metal foil layer (such as an aluminum foil layer) attached tend to have a thick aluminum layer (metal foil layer), have high gas barrier properties, and have the advantage that the amount of dissolved nitrogen is unlikely to increase even after long-term storage, but the flexibility of the pack is poor and it tends to break easily. In addition, the gas barrier layer tends to crack and lose gas barrier properties. In particular, large-capacity ink packs are often deformed by the weight of the ink, and the above tendency is significant. On the other hand, ink packs having the above-mentioned gas barrier layer, which is not a relatively thick gas barrier layer such as a metal foil layer, have the advantages of being excellent in flexibility and unlikely to break even when the ink pack is large-capacity. However, the gas barrier property is relatively low, and the amount of dissolved nitrogen in the ink composition contained therein is likely to increase. For this reason, the present invention is particularly useful.

[0057] The ink pack preferably has at least a resin film layer as a base material for ensuring basic strength. The resin film layer as a base material is not particularly limited, but is preferably a base material made of, for example, polyester resin (PET, etc.) or polyolefin resin (polyethylene, etc.). However, since these base materials have poor gas barrier properties, it is preferable to laminate a gas barrier layer on the base material.

[0058] The gas barrier layer is not particularly limited, but is preferably, for example, a resin layer having excellent gas barrier properties, or a metal or metal compound layer. The metal or metal compound layer is preferably a layer having a predetermined thickness or less. The metal or metal compound layer is preferably, for example, a vapor deposition layer. Examples of resin layers having excellent gas barrier properties include, but are not limited to, nylon, ethylene-vinyl alcohol copolymer resin, polyvinylidene chloride, etc. In addition, the gas barrier properties can be improved by increasing the thickness. Examples of metal or metal compound layers include, but are not limited to, metal layers such as aluminum, and metal compound layers such as alumina, silica, ceria, titania, and zirconia. Examples of vapor deposition layers include aluminum vapor deposition layers, vapor deposition layers such as alumina, silica, etc. Such gas barrier layers tend to be thinner and more flexible than metal foils.

[0059] The capacity of the container is preferably 100 ml or more. More preferably, it is 500 ml or more, 800 ml or more, or 1 liter or more. There is no upper limit, but, for example, it is preferably 10 liters or less, and more preferably 5 liters or less. If the capacity of the container is more than the above range, the weight of the ink container may cause the container members to easily crack or break, and therefore, the ink container of this embodiment is particularly useful. The present invention is particularly useful in that it can suppress the decrease in ejection stability that occurs in the case of a large-capacity ink container.

[0060] The material of the resin film substrate layer in the ink pack is not particularly limited, but examples thereof include polyethylene terephthalate (PET), nylon, and polyethylene (PE). The thickness of the resin film substrate layer is preferably 10 μm or more and 300 μm or less, and 20 μm or more and 250 μm or less. It is more preferably 50 to 200 μm, and even more preferably 70 to 150 μm.

[0061] The gas barrier layer in the ink pack is preferably a gas barrier resin layer made of a resin, or a layer of a metal or a metal compound.

[0062] In the case of a gas barrier resin layer, the resin is not particularly limited, but examples thereof include nylon, ethylene vinyl alcohol, and polyvinylidene chloride. These resin layers may be formed by pasting or vapor deposition. The thickness of the gas barrier resin layer is preferably 5 μm or more and 200 μm or less, and 10 μm or more and 150 μm or less, and more preferably 20 to 100 μm.

[0063] In the case of a metal or metal compound layer, the thickness of the layer is preferably 10 nm or more and 500 nm or less, and more preferably 20 nm or more and 300 nm or less, further preferably 30 to 200 nm, and even more preferably 30 to 100 nm. When forming a metal or metal compound layer, in consideration of flexibility and in terms of achieving a film thickness of a predetermined value or less, deposition, CVD, sputtering, ion plating, and the like are preferred, and deposition is more preferred.

[0064] An ink pack is exemplified as a container of this embodiment. FIG. 6 shows an exploded perspective view of an example of an ink pack. The ink cartridge 10 includes an ink pack 40 filled with ink, and a cartridge case 42 including a main case 46 and a lid 48 that house and protect the ink pack 40. The ink pack 40 includes an ink supply port 44. The main case 46 includes a notch 50 and a groove 56, and the lid 48 includes a pressing portion 52 and a hook 54. In the ink cartridge 10, the ink pack 40 is housed in the main case 46 and the lid 54, and is fixed by fitting the ink supply port 44 into the notch 50 and sandwiching the ink pack 40 between the pressing portion 52 and the notch 50. The main case 46 and the lid 54 are sealed by fitting the hook 54 into the groove 56. For example, the film-like material that constitutes the ink pack 40 and contains the ink within the ink pack may be the material that constitutes the ink pack described above.

[0065] Ink bottles include ink bottles for refilling ink in CISS printers, etc. From the viewpoints of light weight and cost efficiency, resin bottles are preferred as ink bottles, but the airtightness of the lid and the gas barrier properties of the container itself are low, so that dissolved nitrogen tends to increase.

[0066] An ink bottle is exemplified as a container of this embodiment. FIG. 7 shows a cross-sectional view of an example of an ink bottle. The ink bottle 63 contains the above-mentioned ink composition (ink composition IK). The ink bottle 63 includes a cylindrical container body 64 which is the main body of the ink bottle, an ink outlet forming part 66 which is provided at the tip of the container body 64 and has an ink outlet 65 formed at the tip to allow ink to flow out of the ink bottle 63, and a container additional part 67 which is added to the ink outlet forming part 66 so as to surround the ink outlet 65. The ink outlet 65 of the ink outlet forming part 66, including the surrounding container additional part 67, is covered by a bottomed cylindrical cap 68, and is therefore hidden from the outside when the ink bottle 63 is stored.

[0067] The container body 64 of the ink bottle 63 is a bottle-shaped member having an ink storage chamber 76 capable of storing the ink composition IK therein, and a neck 77 at its upper end is formed on the outer circumferential surface with a male thread portion 78. On the other hand, the ink outlet forming portion 66 provided at the upper end of the container body 64 has a large diameter portion 79 located on the outer circumferential side of the neck 77 of the container body 64, a small diameter portion 80 that forms the ink outlet 65 at the position furthest from the container body 64, and an intermediate portion 81 that connects the large diameter portion 79 and the small diameter portion 80. The bottle-shaped member is preferably made of, for example, a polyolefin resin such as polypropylene. Such a member is preferable because it has excellent impact resistance, but on the other hand, it has a relatively low gas barrier property, and is particularly useful as the ink container of this embodiment.

[0068] In addition, in the container of this embodiment, by setting the dissolved nitrogen concentration to 5 ppm or more, for example, it is possible to omit a process of performing sufficient degassing during ink preparation to make the dissolved nitrogen concentration less than 5 ppm, and it is possible to reduce the number of steps required for ink production. In addition, it is not necessary to make the ink container have high gas barrier properties, and the degree of freedom in container design is increased. This allows, for example, the use of a material with excellent flexibility, which results in a larger capacity container and a lower cost container. The ink container may be used in a recording device after a predetermined time has elapsed since the ink container was manufactured. In this case, the dissolved nitrogen concentration of the ink composition may increase as a result of the passage of a predetermined time since the ink container was manufactured, so that the dissolved nitrogen concentration becomes 5 ppm or more. In this case, it is sufficient that the dissolved nitrogen concentration of the ink composition contained in the container of the ink container is 5 ppm or more when the ink container is first used in the recording device. In this case, for example, the ink container may be one for which time has passed since its manufacture due to storage or transportation. In this case, it is possible to take more time for the storage or transportation of the ink container, which can reduce transportation costs and extend the expiration date of the ink container, for example.

[0069] 2. Inkjet recording method The inkjet recording method of the present embodiment includes a deposition step of ejecting the inkjet ink composition supplied from the ink container from an inkjet head and depositing the ink onto a recording medium.

[0070] 2.1. Attachment process The deposition step is a step in which the ink composition supplied from the ink container is discharged from the inkjet head and deposited on the recording medium.

[0071] As an example of a recording device used in the recording method of this embodiment, a perspective view of a printer is shown in Fig. 8. The inkjet recording device 1 in Fig. 8 has an ink tank 50 and an ink supply pipe 24 that supplies ink from the ink tank 50 to the inkjet head 17. A sub-tank 20 that relays the ink is provided in the ink supply path between the ink tank 50 and the inkjet head 17. The sub-tank 20 that relays the ink may be provided as needed. The ink tank 50 has an ink inlet 54 through which ink is injected from an ink container (not shown). In this embodiment, the container of the ink container is an ink bottle, and ink from the ink bottle is injected into the ink tank 50 through the ink inlet 54.

[0072] In the recording device of this embodiment, the ink tank 50 is a CISS tank (continuous ink supply system tank), and ink is injected into the ink tank 50 from the ink bottle as needed, eliminating the need to replace ink cartridges and enabling continuous recording without interruption. The ink tank 50 is made up of four ink tanks so that four inks can be injected, and has four ink injection ports. There are also four connections from the ink supply pipes 24 to the inkjet heads 17.

[0073] The inkjet head 17 ejects droplets of an ink composition to record an image on a recording medium. The inkjet head 17 also includes a carriage 16 that is mounted with a subtank 20 and the inkjet head 17 and can move back and forth in the X-axis direction, a paper feed port 12 that feeds the recording medium, a paper discharge port 14 that discharges the recording medium, and a support unit 13 that supports the recording medium fed to the paper feed port 12. The inkjet head 17 has a nozzle surface provided at a position facing the recording surface of the recording medium, and ejects ink in the form of droplets from a plurality of nozzles provided on the nozzle surface to adhere to the recording surface of the recording medium.

[0074] The inkjet recording method of this embodiment is preferably carried out using a recording apparatus in which the container is an ink bottle, the recording apparatus having an ink tank having an ink inlet for injecting the inkjet ink composition from the ink bottle, and an inkjet head to which the inkjet ink composition is supplied from the ink tank, and in this case as well, the ink is ultimately supplied from the ink bottle to the inkjet head.

[0075] The recording device used in this embodiment is not limited to the one described above. For example, the container of the ink container (not shown) may be an ink pack, and an ink cartridge having an ink pack may be mounted on the recording device, so that ink is supplied from the ink cartridge mounted on the recording device to the inkjet head 17 via the ink supply pipe 24. In this case, the ink tank 50 may not be provided.

[0076] 2.2.Drying process The drying step is a step of drying the ink composition on the recording medium by heating the recording medium, etc. The inkjet recording method of this embodiment may include a drying step.

[0077] 3. Ink container set This embodiment may be a set of two or more ink containers (ink container set) including at least the ink container described above. The ink container set may include two or more ink containers each containing a basic color ink, such as black ink, yellow ink, magenta ink, and cyan ink. The ink container may also contain special color inks other than the basic color inks. Of these ink containers, the ink container of the present embodiment described above is preferably one of the yellow-red inks described above, such as yellow ink, magenta ink, orange ink, and red ink, in that the hue angle that can be recorded in warm colors is wide.Furthermore, it is more preferable that the ink is one of the colors described above. The ink jet recording method of this embodiment may be performed using the above-mentioned ink container set. EXAMPLES

[0078] The present invention will be described in more detail below using examples and comparative examples, but the present invention is not limited to the following examples.

[0079] 1. Preparation of Ink Composition 1 to 5 are shown in Tables 1 to 5, in which the compositions of the ink compositions are shown. Each component was placed in a mixing tank, mixed and stirred, and filtered through a membrane filter to obtain the inkjet ink composition of each example, so as to obtain the composition shown in Tables 1 to 5. The numerical values ​​of each component shown in each example in the tables represent mass % unless otherwise specified. In addition, in the tables, the numerical values ​​of the pigment dispersion liquid represent mass % of the pigment solid content. The pigment was prepared in advance by mixing and stirring in water a dispersant resin (not shown in the table), which is a water-soluble styrene-acrylic resin, in a mass ratio of 3:1, and then preparing a pigment dispersion. This was then used in preparing the ink. All of the inks were yellow-red inks, particularly yellow-red inks other than the yellow ink. The inks using two pigments were capable of recording over a wide range of hue angles.

[0080] Details of the pigments and products used in Tables 1 to 5 are as follows, and the HLB values ​​of the surfactants and the SP values ​​of the organic solvents are shown in the tables. [Pigment dispersion] A: Perinone pigments (PO43, Perinone Orange 43) B: Azo pigments (PR150, Pigment Red 150) C: Quinacridone pigments (PR122, Pigment Red 122) D: Azo pigments (PR242, Pigment Red 242) [Surfactants] KF-640 (product name, manufactured by Shin-Etsu Silicone Co., Ltd.) FZ-2105 (product name, manufactured by Toray Dow Corning Silicone Co., Ltd.) KF-6015 (product name, manufactured by Shin-Etsu Silicone Co., Ltd.) Surfynol 104E (product name, manufactured by Air Products and Chemicals, Inc.) Surfynol SE (product name, manufactured by Air Products and Chemicals, Inc.) Surfynol 440 (product name, manufactured by Air Products and Chemicals, Inc.) Surfynol 465 (trade name, manufactured by Air Products and Chemicals, Inc.)

[0081] 2. Place in container 1 to 5 are shown in Tables 1 to 5, which indicate the types of containers used. Each ink composition was filled into one of containers 1 to 4 prepared by the following preparation method, and the container was stored at room temperature until the measurement time shown in the table. Containers 1 to 3 used a low-density polyethylene film with a thickness of 80 μm as the base material, and each container had a capacity of 1 L and contained 1 L of ink composition. (Composition of each container) Container 1: An aluminum layer with a thickness of 30 nm was formed on one side of a substrate by a deposition method. Then, using the obtained film, a container (ink pack) for storing an ink composition was produced with the aluminum layer as the exterior. Container 2: An aluminum layer having a thickness of 10 μm was formed on one side of a substrate by a deposition method.Then, using the obtained film, a container (ink pack) for storing an ink composition was produced with the aluminum layer as the exterior. Container 3: A nylon film having a thickness of 30 μm was laminated on one side of the substrate. Then, using the obtained film, a container (ink pack) for storing an ink composition was produced with the nylon film layer as the exterior. · Container 4: A bottle-shaped container (ink bottle) was formed by stretch blow molding using polyethylene.

[0082] After storage, the amount of dissolved nitrogen in the ink in the container was measured. The measurement was performed using a gas chromatograph (6890N, manufactured by Agilent) and was calculated by mass conversion. The measured values ​​are shown in the table. The amount of dissolved nitrogen in each ink immediately before filling the container was 4 ppm. In the evaluation described below, the ink container after storage was used.

[0083] 3. Evaluation method 3.1.Discharge stability 3.1.1.Continuous discharge A modified inkjet printer PX-H6000 (manufactured by Seiko Epson Corporation) was prepared and filled with the inkjet ink composition. An example of the ink container of the ink accommodating body being an ink pack is a recording device in which ink is supplied to the inkjet head from an ink cartridge having an ink pack via an ink supply tube.An example of the ink container of the ink accommodating body being an ink bottle is a recording device in which the recording device includes an ink tank having an ink inlet, ink is injected from the ink bottle into the ink inlet of the ink tank, and ink is supplied from the ink tank to the inkjet head via the ink supply tube. FUJI XEROX printer paper "P" (A4 size) was set and continuous printing was performed at a resolution of 720 dpi x 1440 dpi. A nozzle check was performed every 10 sheets to confirm that printing was normal without any non-ejection or deflection. The evaluation criteria are as follows. (Evaluation Criteria) A: More than 100 sheets were printed successfully. B: Between 10 and 100 sheets printed successfully C: Non-ejection or deflection occurred on 10 sheets.

[0084] 3.1.2.Clogging resistance The inkjet ink compositions of each of the examples and comparative examples were filled into the above-mentioned recording device, and it was confirmed that all the rows were ejected normally. After that, the print head was shifted from the standby position and stopped in the printing area, and left for 3 days under an environment of 40°C and 20% RH. After being left, the print head was returned to the standby position and cleaning was performed. For the cleaning, 1 cc of ink was sucked from the nozzles on the nozzle surface of a predetermined nozzle group (600 nozzles) of the inkjet head, and after the suction, the ink was manually wiped off using a rubber wiper. The number of cleaning operations required until ejection was restored (no non-ejecting nozzles were found) was counted. The evaluation criteria were as follows: (Evaluation Criteria) A: All nozzles were restored after 3 or fewer cleanings. B: All nozzles were restored after 4 to 9 cleanings. C: No recovery even after 9 cleanings

[0085] 3.2. Storage stability Each ink composition was taken out of the ink container, placed in a 50cc glass sample bottle and sealed, and these glass bottles were placed in a thermostatic chamber at 50°C and left in an environment of 50°C for 14 days. After leaving them, the temperature of the ink composition was sufficiently returned to room temperature, and then the viscosity was measured. The viscosity was determined by adjusting the temperature of the ink composition to 25°C using a viscoelasticity tester MCR-300 (product name) made by Pysica, and reading the viscosity when the shear rate was 200. The viscosity change rate A after 14 days relative to the initial viscosity was then calculated. The evaluation criteria are as follows: (Evaluation Criteria) A: Viscosity change rate A is less than ±5% B: Viscosity change rate A is ±5% or more and less than 10% C: Viscosity change rate A is ±10% or more

[0086] 4. Evaluation results of the examples Tables 1 to 4 show the composition of the inkjet ink composition used in each example, the method of storing the inkjet ink composition in the container, and the evaluation results. From Tables 1 to 4, it can be seen that the ink container of this embodiment, which has an inkjet ink composition and a container for storing the inkjet ink composition, the inkjet ink composition is a water-based ink containing a pigment and a surfactant, the pigment contains at least two pigments having different chemical structure classifications, the surfactant contains a polysiloxane-based surfactant having an HLB value of 10 or more and an acetylene glycol-based surfactant having an HLB value of 6 to 10, and the amount of dissolved nitrogen in the stored inkjet ink composition is 5 ppm or more, is excellent in ejection stability (ejection evaluation). It is also excellent in storage stability. In contrast, the comparative examples, which are ink containers other than those of this embodiment, all had poor ejection evaluations.

[0087] 5.Reference example Reference Examples 1 to 5 were prepared and evaluated by the above-described methods in the same manner as in the Examples. The composition of the inkjet ink composition, the method of storing in the container, and the evaluation results are shown in Table 5. It can be seen from Tables 1 to 5 that problems with ejection stability can occur depending on the amount of dissolved nitrogen in the ink container, the number of pigment types, etc. [Explanation of symbols]

[0088] 10...ink cartridge, 40...ink pack, 42...cartridge case, 44...ink supply port, 46...main body case, 48...lid portion. 63...ink bottle, 64...container main body, 65...ink outlet, 66...ink outlet forming portion, 67...container additional portion, 69...male thread portion, 70...protrusion, 71...convex portion (fitting portion), 72...second uneven portion, 74...valve, 76...ink storage chamber, 77...neck portion, 78...male thread portion, 79...large diameter portion, 80...small diameter portion, 81...middle portion, 82...female thread portion, 83...junction, IK...ink composition. 1...inkjet recording device, 12...paper feed port, 13...support part, 14...paper discharge port, 16...carriage, 17...inkjet head, 20 (20Bk, 20Cn, 20Ma, 20Yw)...subtank, 24...ink supply tube (ink supply path), 50...ink tank, 54 (51)...ink inlet, X...X-axis, Y...Y-axis, Z...Z-axis.

Claims

1. An ink container having an ink-jet ink composition and a container for containing the ink-jet ink composition, The ink-jet ink composition is a water-based ink containing a pigment and a surfactant, The pigment comprises at least two pigments having different chemical structure classes; The surfactant includes a polysiloxane-based surfactant having an HLB value of 10 or more, and an acetylene glycol-based surfactant having an HLB value of 6 or more and 10 or less, The amount of dissolved nitrogen in the contained ink-jet ink composition is 5 ppm or more. Ink container.

2. a mass ratio (A / B) of the content A of the polysiloxane surfactant to the content B of the acetylene glycol surfactant is 0.3 or more and 8.0 or less; The ink container according to claim 1 .

3. The ink-jet ink composition has an SP value of 9 (cal / cm ３ ) １／２ More than 13.5 (cal / cm ３ ) １／２ Contains an organic solvent which is The ink container according to claim 1 .

4. the content C of the organic solvent is 0.5% by mass or more and 15% by mass or less with respect to the total amount of the inkjet ink composition; The ink container according to claim 3 .

5. a mass ratio (B / C) of the content B of the acetylene glycol surfactant to the content C of the organic solvent is 0.3 or less; The ink container according to claim 3 .

6. the container is an ink pack made of a member having a multi-layer structure, or an ink bottle made of resin; The ink container according to claim 1 .

7. the container is an ink pack made of a member having a multi-layer structure or an ink bottle made of resin, The ink pack has a resin film substrate layer and a gas barrier layer, The gas barrier layer has at least one of a gas barrier resin layer and a metal or metal compound layer having a thickness of 500 nm or less. The ink container according to claim 1 .

8. the container is an ink pack made of a member having a multi-layer structure or an ink bottle made of resin, The ink pack has a resin film substrate layer and a gas barrier layer, the gas barrier layer has at least one of a gas barrier resin layer and a metal or metal compound layer having a thickness of 500 nm or less, The metal or metal compound layer is a vapor deposition layer. The ink container according to claim 1 .

9. The amount of dissolved nitrogen is 5 ppm or more and 20 ppm or less. The ink container according to claim 1 .

10. The capacity of the container is 800 mL or more. The ink container according to claim 1 .

11. The pigment includes two types of pigments having different chemical structure classifications selected from the group consisting of azo compounds, quinacridone compounds, dioxazine compounds, perinone compounds, perylene compounds, and diketopyrrolopyrrole compounds. The ink container according to claim 1 .

12. The pigment comprises a first pigment compound which is an azo-based compound; and at least one second pigment compound selected from the group consisting of quinacridone compounds, dioxazine compounds, perinone compounds, perylene compounds, and diketopyrrolopyrrole compounds. The ink container according to claim 1 .

13. the content A of the polysiloxane-based surfactant is 0.3% by mass or more and 1.5% by mass or less with respect to the total amount of the ink-jet ink composition; The ink container according to claim 1 .

14. the content B of the acetylene glycol surfactant is 0.1% by mass or more and 1.0% by mass or less with respect to the total amount of the inkjet ink composition; The ink container according to claim 1 .

15. The ink-jet ink composition has a yellow-red hue. The ink container according to claim 1 .

16. a mass ratio (A / B) of the content A of the polysiloxane surfactant to the content B of the acetylene glycol surfactant is 1.2 or more and 4.0 or less; The ink container according to claim 1 .

17. a step of ejecting the ink-jet ink composition supplied from the ink container according to any one of claims 1 to 16 from an ink-jet head and depositing the ink-jet ink composition on a recording medium, Inkjet recording method.

18. the container is an ink bottle, The method is carried out by using a recording apparatus having an ink tank having an ink inlet for injecting the ink-jet ink composition from the ink bottle, and an ink-jet head to which the ink-jet ink composition is supplied from the ink tank, The inkjet recording method according to claim 17.

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