Inkjet composition

Abstract

Provided is an inkjet composition capable of reducing peeling of a nozzle plate and nozzle leakage. An inkjet composition according to an embodiment of the present invention is an inkjet composition to be ejected from an inkjet head having a nozzle plate in which a plurality of nozzles are formed, and a flow path substrate joined to one face of the nozzle plate, the flow path substrate being formed with a flow path including a liquid storage chamber for storing a liquid to be supplied to the plurality of nozzles, the liquid storage chamber being formed by a recess provided on a face of the flow path substrate opposite the nozzle plate, the inkjet composition having a surface tension of 31 mN / m or less at 25°C.

Description

Technical Field

[0001] This invention relates to an inkjet composition. Background Technology

[0002] A liquid ejector head is known that ejects ink from a pressure chamber through a nozzle by changing the volume of the pressure chamber using a piezoelectric element. For example, the inkjet head described in Patent Document 1 is formed by joining a flow path forming component, a connecting plate, and a nozzle plate using an adhesive. However, in the inkjet head described in Patent Document 1, there are multiple locations where the adhesive-jointed parts come into contact with the ink. The adhesive at these locations swells due to ink erosion, leading to a problem where the reliability of the inkjet head can easily deteriorate, such as nozzle plate peeling.

[0003] Therefore, for example, as described in Patent Document 2, by raising the flow path substrate integrally formed between the nozzle plate and the liquid storage chamber, the part that is bonded by the adhesive and comes into contact with the ink is only near the nozzle, which can reduce nozzle plate peeling and improve the reliability of the inkjet head.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2020-55305

[0007] Patent document 2: Japanese Patent Application Publication No. 2020-93415.

[0008] However, inkjet heads designed to reduce nozzle plate peeling have a smaller liquid reservoir volume due to the increased height of the reservoir. Consequently, the pressure used to propel the ink from the reservoir into the flow path is insufficient, leading to nozzle slippage (leakage) problems during ink ejection. Summary of the Invention

[0009] One technical solution of the inkjet composition involved in this invention relates to an inkjet composition ejected from an inkjet head, the inkjet head having:

[0010] A nozzle plate having multiple nozzles; and

[0011] A flow path substrate, joined to one side of the nozzle plate, the flow path substrate forming a flow path including a liquid storage chamber for storing liquid to be supplied to the plurality of nozzles.

[0012] The liquid storage chamber is formed by a recess on the surface of the flow path substrate opposite to the nozzle plate.

[0013] The surface tension of the inkjet composition at 25°C is below 31 mN / m. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the inkjet head used in the inkjet composition involved in this embodiment.

[0015] Symbol Explanation

[0016] 26. Inkjet head; 31. Nozzle plate; 32. Flow path substrate; 322. Recess; 324. First flow path; 326. Second flow path; 33. Vibrating plate; 331. Elastic membrane; 332. Support plate; 333. Island section; 334. Elastic compliant membrane; 34. Housing; 341. Inlet; 35. Fixing component; 36. Piezoelectric element; C. Pressure chamber; N. Nozzle; R. Liquid storage chamber. Detailed Implementation

[0017] Hereinafter, embodiments of the present invention will be described. The embodiments described below are examples illustrating the present invention. The present invention is not limited to any of the following embodiments and includes various modifications implemented without altering the spirit of the invention. Furthermore, all structures described below are not necessarily essential structures of the present invention.

[0018] 1. Inkjet composition

[0019] One embodiment of the present invention relates to an inkjet composition ejected from an inkjet head, the inkjet head having: a nozzle plate having a plurality of nozzles; and a flow path substrate having one side of the nozzle plate, the flow path substrate having a flow path including a liquid reservoir for storing liquid for supplying to the plurality of nozzles, wherein the liquid reservoir is formed by a recess provided on the surface of the flow path substrate opposite to the nozzle plate, and the inkjet composition having a surface tension of 31 mN / m or less at 25°C.

[0020] In the inkjet head (hereinafter also referred to as "specific inkjet head") used in the inkjet composition according to this embodiment, the liquid reservoir is heightened, thus making it easier to make the volume smaller than that of conventional liquid reservoirs. As a result, the pressure used to push the ink from the liquid reservoir to the flow path is insufficient, and nozzle leakage is likely to occur when ink is ejected.

[0021] Therefore, the inventors conducted in-depth research and discovered that even when using such an inkjet head, nozzle slippage can be significantly reduced by adjusting the surface tension of the inkjet composition to below a specific value. It is speculated that this is because setting the surface tension of the inkjet composition to below a specific value facilitates ink flow in the flow path.

[0022] In this invention, "inkjet composition" refers to an ink composition that is ejected using an inkjet method. "Inkjet method" refers to a recording method in which droplets of ink or the like are ejected from the nozzle of an inkjet head, such as an inkjet recording device, and applied to a recording medium. Furthermore, in this specification, "inkjet composition" is sometimes also referred to as "inkjet ink composition," "ink composition," or "ink."

[0023] 1.1 Inkjet Head

[0024] The inkjet composition involved in this embodiment is an inkjet composition ejected from an inkjet head, the inkjet head having: a nozzle plate having a plurality of nozzles; and a flow path substrate having one side of the nozzle plate, the flow path substrate having a flow path including a liquid storage chamber for storing liquid for supplying to the plurality of nozzles, wherein the liquid storage chamber is formed by a recess provided on the surface of the flow path substrate opposite to the nozzle plate.

[0025] 1.1.1 Overall Structure of the Inkjet Head

[0026] Figure 1 This is a cross-sectional view of the inkjet head 26 used in the inkjet composition according to this embodiment. Figure 1 As illustrated, the direction perpendicular to the XY plane will be hereinafter labeled the Z direction. The ink ejection direction achieved by the inkjet head 26 is typically the vertical direction, which corresponds to the Z direction. Furthermore, Figure 1 It is a sectional view parallel to the XZ plane.

[0027] like Figure 1 As illustrated, the inkjet head 26 includes a nozzle plate 31, a flow path substrate 32, a vibrating plate 33, a housing 34, a fixing member 35, and multiple piezoelectric elements 36. These are bonded together, for example, using an adhesive. The nozzle plate 31 is bonded to the positive surface of the flow path substrate 32 in the Z direction, and the vibrating plate 33 is bonded to the negative surface of the flow path substrate 32 in the Z direction. The nozzle plate 31 is a plate-shaped member having multiple nozzles N arranged along the Y direction. Each nozzle N is a through-hole for ink to pass through. The Y direction can also be referred to as the direction in which the multiple nozzles N are arranged. The nozzle plate 31 is made of a metal material such as stainless steel. For example, the nozzle plate 31 can be manufactured by processing a metal plate using dry etching. Furthermore, there are no particular limitations on the constituent materials and manufacturing methods of the nozzle plate 31, and they can be arbitrary. For example, the nozzle plate 31 can be formed by processing a single-crystal silicon substrate using semiconductor manufacturing techniques such as etching.

[0028] The flow path substrate 32 is a plate-shaped component used to form the flow path of ink. For example... Figure 1As illustrated, a liquid storage chamber R, a first flow path 324, a pressure chamber C, and a second flow path 326 are formed on the flow path substrate 32. The liquid storage chamber R is formed by a recess 322 on the negative side of the surface of the flow path substrate 32 in the Z direction. The recess 322 is a space recessed relative to the negative side of the surface of the flow path substrate 32 in the Z direction. The liquid storage chamber R is a common liquid chamber that spans multiple nozzles N continuously. In contrast, the first flow path 324, the second flow path 326, and the pressure chamber C are formed for each nozzle N. The pressure chamber C is located between the nozzle plate 31 and the vibrating plate 33, and is a space for applying pressure to the ink filled in the pressure chamber C. The first flow path 324 is a throttling flow path for connecting the pressure chamber C and the liquid storage chamber R. The first flow path 324 is formed by a recess on the negative side of the surface of the flow path substrate 32 in the Z direction. The ink stored in the liquid storage chamber R branches into each of the first flow paths 324 and is supplied and filled into a plurality of pressure chambers C in parallel. The second flow path 326 is formed by a through hole that connects the pressure chamber C to the nozzle N. The flow path substrate 32 is formed, for example, by processing a single-crystal silicon (Si) substrate using semiconductor manufacturing techniques such as etching.

[0029] In the inkjet head used for the inkjet composition according to this embodiment, it is preferable that the cross-sectional area of ​​the first flow path 324 is smaller than the cross-sectional area of ​​the second flow path 326. That is, the flow path formed on the flow path substrate 32 includes a first flow path 324 for conveying the inkjet composition from the liquid reservoir R and a second flow path 326 for conveying the inkjet composition from the first flow path 324 to the nozzle N, and it is preferable that the cross-sectional area of ​​the first flow path 324 is smaller than the cross-sectional area of ​​the second flow path 326. With an inkjet head of this structure, it is possible to further reduce the backflow of ink into the liquid reservoir R after ink is ejected, but greater pressure is required to expel the ink from the liquid reservoir R, and nozzle leakage is more likely to occur. According to the inkjet composition according to this embodiment, even with an inkjet head including such a reduced cross-sectional area first flow path 324, nozzle leakage can be effectively reduced. Furthermore, the cross-sectional area of ​​the first flow path 324 is preferably the cross-sectional area when viewed from the X direction, and the cross-sectional area of ​​the second flow path 326 is preferably the cross-sectional area when viewed from the Z direction. In addition, the X direction is also called the "first direction" and the Z direction is called the "second direction".

[0030] The vibrating plate 33 is composed of an elastic membrane 331 and a support plate 332. The elastic membrane 331 is bonded to the surface of the flow path substrate 32, and the support plate 332 is laminated on the elastic membrane 331. The elastic membrane 331 is made of a resin material such as para-aromatic polyamide resin. The support plate 332 is made of a metal material such as stainless steel. The support plate 332 is formed in the shape of having island-shaped portions 333 that overlap with each pressure chamber C. In addition, the support plate 332 is removed in the area that overlaps with the liquid storage chamber R. Therefore, the vibrating plate 33 in this area is composed of a single layer of elastic membrane 331, which functions as an elastic compliant membrane 334. The elastic compliant membrane 334 forms part of the wall that divides the liquid storage chamber R and absorbs pressure fluctuations within the liquid storage chamber R.

[0031] The housing 34 is a structure, for example, made by injection molding of a resin material, and is joined to the side of the vibrating plate 33 opposite to the flow path substrate 32. Figure 1 As illustrated, an inlet 341 is formed on the housing 34. The inlet 341 is a through hole communicating with the liquid storage chamber R. The inlet 341 introduces ink from a liquid container (not shown) into the liquid storage chamber R.

[0032] The fixing component 35 is used to mount the piezoelectric element 36 to the housing 34, and is fixed to the housing 34 using adhesive or the like. The piezoelectric element 36 is a longitudinally vibrating type drive element formed by alternating layers of piezoelectric body layers (not shown), with its top end abutting against the island-shaped portion 333. In a manner that is linked to the deformation of the piezoelectric element 36, the island-shaped portion 333 vibrates together with the elastic membrane 331. At this time, the volume of the pressure chamber C changes, and ink is ejected from the nozzle N.

[0033] 1.1.2 Liquid Storage Chamber

[0034] like Figure 1 As illustrated above, the inkjet head 26 includes: a nozzle plate 31 having a plurality of nozzles N; and a flow path substrate 32 having a flow path comprising a liquid storage chamber R for storing liquid to be supplied to the plurality of nozzles N. Here, as... Figure 1 As illustrated, the flow path substrate 32 is bonded to one side of the nozzle plate 31. This bonding is achieved, for example, using an adhesive. There are no particular limitations on the adhesive, but examples include epoxy-based adhesives and polyurethane-based adhesives. The adhesive may also contain fillers such as silica or alumina.

[0035] like Figure 1As illustrated, a recess 322 is provided on the surface of the flow path substrate 32 opposite to the nozzle plate 31. A liquid storage chamber R is formed by this recess 322. As a result, the adhesive that bonds the nozzle plate 31 and the flow path substrate 32 together is not exposed to the liquid in the liquid storage chamber R, and therefore the adhesive will not deteriorate due to the liquid.

[0036] The physical properties and components of the inkjet composition described in this embodiment will be explained below.

[0037] 1.2 Surface tension of inkjet composition

[0038] The inkjet composition according to this embodiment has a surface tension of 31 mN / m or less at 25°C. Preferably, it is 30.5 mN / m or less, more preferably 30 mN / m or less, even more preferably 29.5 mN / m or less, even more preferably 29 mN / m or less, particularly preferably 28.5 mN / m or less, even more preferably 28 mN / m or less, especially preferably 27.5 mN / m or less, even more preferably 27 mN / m or less, and even more preferably 26.5 mN / m or less. When the surface tension of the inkjet composition at 25°C is within the above range, nozzle leakage can be effectively reduced even when using a specific inkjet head.

[0039] In addition, as a method for measuring surface tension, an example can be given of a method using a commonly used surface tension meter (e.g., Kyowa Interface Science Co., Ltd., surface tension meter CBVP-Z, etc.) to measure it at a liquid temperature of 25°C using the Wilhelmi method.

[0040] There are no limitations on adjusting the surface tension of the inkjet composition, but it can be done, for example, by adjusting the type or content of surfactants or organic solvents that may be contained in the ink.

[0041] 1.3 Surfactants

[0042] The inkjet composition involved in this embodiment preferably contains a surfactant. There are no particular limitations on the surfactant; examples include acetylenic diol surfactants, fluorinated surfactants, and organosilicon surfactants.

[0043] There are no particular limitations on the alkynyldiol-based surfactants, but one or more of the following are preferred: olefinic adducts of 2,4,7,9-tetramethyl-5-decyn-4,7-diol and 2,4,7,9-tetramethyl-5-decyn-4,7-diol, and olefinic adducts of 2,4-dimethyl-5-decyn-4-ol and 2,4-dimethyl-5-decyn-4-ol. There are no particular limitations on commercially available alkynyldiol-based surfactants, but examples include the Olfine 104 series, Olfine E1010, E1020, etc. (trade names manufactured by Air Products Japan, Inc.), Surfynol 465, Surfynol 61, Surfynol DF110D (trade names manufactured by Nissin Chemical Industry Co., Ltd.).

[0044] There are no particular limitations on fluorinated surfactants, but examples include perfluoroalkyl sulfonates, perfluoroalkyl carboxylates, perfluoroalkyl phosphates, perfluoroalkyl ethylene oxide additions, perfluoroalkyl betaines, and perfluoroalkyl amine oxides. There are no particular limitations on commercially available fluorinated surfactants, but examples include S-144 and S-145 (manufactured by Asahi Glass Co., Ltd.); FC-170C, FC-430, and Fluorad-FC4430 (manufactured by Sumitomo 3M Co., Ltd.); FSO, FSO-100, FSN, FSN-100, and FS-300 (manufactured by DuPont); and FT-250 and 251 (manufactured by Neos Co., Ltd.).

[0045] Examples of silicone-based surfactants include polysiloxane compounds and polyether-modified silicones. There are no specific restrictions on commercially available silicone-based surfactants, but examples include BYK-306, BYK-307, BYK-333, BYK-341, BYK-345, BYK-346, BYK-347, BYK-348, BYK-349 (all trade names, manufactured by BYKChemie Japan Co., Ltd.), and 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, KF-6017 (the above trade names are manufactured by Shin-Etsu Chemical Co., Ltd.), etc.

[0046] The surfactant content relative to the inkjet composition is preferably 0.1 to 5.0% by mass, more preferably 0.2 to 3.0% by mass, even more preferably 0.3 to 2.0% by mass, particularly preferably 0.4 to 1.5% by mass, and even more preferably 0.5 to 1.3% by mass. When the surfactant content is within the above range, there is a tendency to further reduce nozzle leakage.

[0047] The inkjet composition described in this embodiment may contain only one surfactant, but preferably two or more. By using multiple surfactants in combination, the surface tension of the ink can be further reduced compared to using only one surfactant, and there is a tendency to further reduce nozzle slippage.

[0048] In particular, it is preferable to contain two or more surfactants with different HLB values. More preferably, it contains a surfactant with an HLB value of 3 to 8 (hereinafter also referred to as "surfactant A") and a surfactant with an HLB value of 12 to 16 (hereinafter also referred to as "surfactant B").

[0049] Here, the HLB (Hydrophile-Lipophile Balance) value of the surfactant is calculated using the Griffin method. Specifically, the HLB value of the surfactant can be calculated according to the following formula (H).

[0050] HLB value = 20 × (mass % of hydrophilic groups) ... (H)

[0051] 1.3.1 Surfactant A

[0052] The inkjet composition described in this embodiment preferably contains a surfactant (surfactant A) with an HLB value of 3 to 8. Surfactant A has high hydrophobicity and excellent defoaming properties. As a result, it is possible to reduce the residue, growth, or detachment of bubbles that may occur on the flow path of the inkjet head, and further reduce nozzle leakage.

[0053] Surfactant A is preferably an alkynyldiol-based surfactant with an HLB value of 3 to 8. Examples of such surfactants include, for instance, olefinic adducts of alkynyldiols with 10 or more carbon atoms in the main chain. When surfactant A is an alkynyldiol-based surfactant, it is a nonionic surfactant, which facilitates uniform wetting and spreading of the ink relative to the inkjet head components, and can sometimes further reduce nozzle slippage.

[0054] The HLB value of surfactant A is preferably 3 to 6, more preferably 3 to 5, and even more preferably 4 to 5. When the HLB value is within the above range, there is a tendency for better defoaming properties.

[0055] There are no particular restrictions on commercially available surfactants A, but examples include Surfynol 61 (HLB value: 6), Surfynol 104S (HLB value: 4), Surfynol 104PG50 (HLB value: 4), Surfynol 420 (HLB value: 4), Surfynol 82 (HLB value: 4), Surfynol DF110D (HLB value: 3), Surfynol MD-20 (HLB value: 4), and Surfynol SE-F (HLB value: 6), all manufactured by Nissin Chemical Industries, Ltd. These surfactants can be used alone or in combination of two or more.

[0056] The content of surfactant A relative to the inkjet composition is preferably 0.01 to 2.0% by mass, more preferably 0.05 to 1.5% by mass, even more preferably 0.1 to 1.0% by mass, particularly preferably 0.15 to 0.7% by mass, and even more preferably 0.2 to 0.4% by mass. When the content of surfactant A is within the above range, there is a tendency to further reduce nozzle leakage.

[0057] 1.3.2 Surfactant B

[0058] The inkjet composition involved in this embodiment preferably contains a surfactant (surfactant B) with an HLB value of 12 to 16. Surfactant B has high hydrophilicity and excellent wetting properties. Therefore, ink containing surfactant B can easily wet and spread relative to the inkjet head components, and is less prone to nozzle slippage.

[0059] From the same viewpoint as surfactant A, surfactant B is preferably an alkynyldiol-based surfactant with an HLB value of 12 to 16. The HLB value of surfactant B is preferably 12 to 15, more preferably 12 to 14, and even more preferably 13 to 14. When the HLB value is within the above range, there is a tendency for better wetting properties. Furthermore, when two or more surfactants B are used in combination, the HLB value is obtained by weighted averaging.

[0060] There are no particular restrictions on commercially available surfactants B, but examples include the Olfine 104 series, Olfine E1010 (HLB value 13), and Olfine E1020 (HLB value 15-16) manufactured by Nissin Chemical Industries, Ltd., and Newcol 1006 (HLB value 13.4) and Newcol 1008 (HLB value 14.6) manufactured by Nippon Emulsifier Co., Ltd. These surfactants can be used alone or in combination of two or more.

[0061] The content of surfactant B relative to the inkjet composition is preferably 0.1 to 2.0% by mass, more preferably 0.2 to 1.5% by mass, even more preferably 0.3 to 1.0% by mass, and particularly preferably 0.4 to 0.7% by mass. When the content of surfactant B is within the above range, there is a tendency to further reduce nozzle leakage.

[0062] 1.3.3 Content ratio

[0063] In the inkjet composition according to this embodiment, the content of surfactant B relative to the total mass of the inkjet composition is set as M. B Let M be the content of surfactant A relative to the total mass of the inkjet composition. A At this point, the content ratio (M) B / M A The preferred concentration of surfactant A is 1.5–4.0, more preferably 1.5–3.5, further preferably 1.5–3.0, particularly preferably 1.7–2.5, and even more preferably 1.8–2.2. Because surfactant A has relatively high hydrophobicity, it easily adsorbs onto the adhesive used in the inkjet head, sometimes leading to nozzle plate peeling. In contrast, because surfactant B has relatively high hydrophilicity, it is less prone to the above-mentioned problems. Therefore, when the content ratio (M…)… B / M A Within the above range, there is a tendency to effectively reduce nozzle leakage and nozzle plate peeling.

[0064] 1.4 Organic solvents

[0065] The inkjet composition described in this embodiment may also contain an organic solvent. A water-soluble organic solvent is more preferably used. Furthermore, "water-soluble" means having a solubility of, for example, 0.1 g or more relative to 100 g of water at 20°C.

[0066] Examples of organic solvents include esters, alkylene glycol ethers, cyclic esters, nitrogen-containing solvents, alcohols, and polyols. Examples of nitrogen-containing solvents include cyclic amides and non-cyclic amides. Examples of non-cyclic amides include alkoxyalkylamides.

[0067] Examples of esters include ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, dipropylene glycol monomethyl ether acetate, methoxybutyl acetate, and other diol monoacetates; ethylene glycol diacetate, diethylene glycol diacetate, propylene glycol diacetate, dipropylene glycol diacetate, ethylene glycol acetate propionate, ethylene glycol acetate butyrate, diethylene glycol acetate butyrate, diethylene glycol acetate propionate, diethylene glycol acetate butyrate, dipropylene glycol acetate butyrate, dipropylene glycol acetate propionate, dipropylene glycol acetate butyrate, dipropylene glycol acetate butyrate, dipropylene glycol acetate propionate, and other diol diesters.

[0068] As alkylene glycol ethers, any mono- or di-ether of an alkylene glycol is acceptable, with alkyl ethers being preferred. Specific examples include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether (TEGmBE), tetraethylene glycol monomethyl ether, tetraethylene glycol monoethyl ether, tetraethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monobutyl ether, and tripropylene glycol monoethyl ether. Alkylene glycol monoalkyl ethers such as butyl ether, and alkylene glycol dialkyl ethers such as ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, diethylene glycol methyl ethyl ether, diethylene glycol methyl butyl ether, triethylene glycol dimethyl ether, triethylene glycol diethyl ether, triethylene glycol dibutyl ether, triethylene glycol methyl butyl ether, tetraethylene glycol dimethyl ether, tetraethylene glycol diethyl ether, tetraethylene glycol dibutyl ether, propylene glycol dimethyl ether, propylene glycol diethyl ether, dipropylene glycol dimethyl ether, dipropylene glycol diethyl ether, dipropylene glycol diethyl ether, tripropylene glycol dimethyl ether, etc.

[0069] Examples of cyclic esters include β-propiolactone, γ-butyrolactone, δ-valerolactone, ε-caprolactone, β-butyrolactone, β-valerolactone, γ-valerolactone, β-caprolactone, γ-caprolactone, δ-caprolactone, β-heptanelactone, γ-heptanelactone, δ-heptanelactone, ε-heptanelactone, γ-octanelactone, δ-octanelactone, ε-octanelactone, δ-nonanolactone, ε-nonanolactone, and ε-decanolactone, as well as compounds in which the hydrogen atom of the methylene group adjacent to these carbonyl groups is replaced by an alkyl group having 1 to 4 carbon atoms.

[0070] Examples of alkoxyalkylamides include, for example, 3-methoxy-N,N-dimethylpropionamide, 3-methoxy-N,N-diethylpropionamide, 3-methoxy-N,N-methylethylpropionamide, 3-ethoxy-N,N-dimethylpropionamide, 3-ethoxy-N,N-diethylpropionamide, 3-ethoxy-N,N-methylethylpropionamide, 3-n-butoxy-N,N-dimethylpropionamide, 3-n-butoxy-N,N-diethylpropionamide, and 3-n-butoxy-N,N-methylethylpropionamide. Acrylamide, 3-n-propoxy-N,N-dimethylpropionamide, 3-n-propoxy-N,N-diethylpropionamide, 3-n-propoxy-N,N-methylethylpropionamide, 3-isopropoxy-N,N-dimethylpropionamide, 3-isopropoxy-N,N-diethylpropionamide, 3-isopropoxy-N,N-methylethylpropionamide, 3-tert-butoxy-N,N-dimethylpropionamide, 3-tert-butoxy-N,N-diethylpropionamide, 3-tert-butoxy-N,N-methylethylpropionamide, etc.

[0071] As cyclic amides, examples include lactams, such as 2-pyrrolidone, 1-methyl-2-pyrrolidone, 1-ethyl-2-pyrrolidone, 1-propyl-2-pyrrolidone, 1-butyl-2-pyrrolidone, and other pyrrolidones.

[0072] Examples of alcohols include compounds in which one hydrogen atom of an alkane is replaced by a hydroxyl group. The alkane preferably has 10 or fewer carbon atoms, more preferably 6 or fewer, and even more preferably 3 or fewer. The alkane has 1 or more carbon atoms, preferably 2 or more. The alkane can be straight-chain or branched. Examples of alcohols include methanol, ethanol, n-propanol, isopropanol, n-butanol, 2-butanol, tert-butanol, isobutanol, n-pentanol, 2-pentanol, 3-pentanol, and tert-pentanol.

[0073] Polyols have two or more hydroxyl groups in their molecules. Polyols can be classified into, for example, alkane diols and polyols.

[0074] Examples of alkane diols include compounds in which alkanes are replaced by two hydroxyl groups. Examples of alkane diols include ethylene glycol (also known as ethane-1,2-diol), propylene glycol (also known as propane-1,2-diol), 1,2-butanediol, 1,2-pentanediol, 1,2-hexanediol, 1,2-octanediol, 1,3-propanediol, 1,3-butanediol (also known as 1,3-butanediol), 1,4-butanediol, 2,3-butanediol, 1,2-pentanediol, 1,5-pentanediol, 2... 4-Pentanediol, 2-Methyl-1,3-propanediol, 3-Methyl-1,3-butanediol, 3-Methyl-1,5-pentanediol, 2-Ethyl-1,3-hexanediol, 2-Methyl-1,3-pentanediol, 3-Methyl-1,5-pentanediol, 2-Methylpentane-2,4-diol, 1,6-hexanediol, 2-Ethyl-2-methyl-1,3-propanediol, 2-Methyl-2-propyl-1,3-propanediol, etc.

[0075] Examples of polyols include condensates of two or more alkane diols formed by intermolecular condensation of hydroxyl groups, and compounds having three or more hydroxyl groups.

[0076] Examples of alkyl glycols, which are condensates formed by the intermolecular condensation of two or more molecules through hydroxyl groups, include dialkylene glycols such as diethylene glycol and dipropylene glycol, trialkylene glycols such as triethylene glycol (standard boiling point 287.4°C) and tripropylene glycol.

[0077] Compounds having three or more hydroxyl groups are compounds with an alkane or polyether structure as their backbone and containing three or more hydroxyl groups. Examples of compounds having three or more hydroxyl groups include glycerol (standard boiling point 290°C), trimethylolethane, trimethylolpropane, 1,2,5-hexanetriol, 1,2,6-hexanetriol, pentaerythritol, and polyoxypropylene triol.

[0078] Alkane diols and polyols can primarily function as penetrating solvents and / or moisturizing solvents. Furthermore, alkane diols tend to be stronger penetrating solvents, while polyols tend to be stronger moisturizing solvents.

[0079] Organic solvents can be used alone or in combination of two or more.

[0080] The inkjet composition involved in this embodiment preferably contains a polyol with a standard boiling point of 270°C or higher. Polyols with a standard boiling point of 270°C or higher have particularly excellent moisturizing properties, tending to improve the ink's moisturizing properties and enhance its clogging recovery. The standard boiling point of the polyol is more preferably 275°C or higher, even more preferably 280°C or higher, and especially preferably 285°C or higher.

[0081] Examples of polyols with a standard boiling point of 270°C or higher include glycerol (standard boiling point 290°C), triethylene glycol (standard boiling point 287.4°C), and tripropylene glycol (standard boiling point 270°C). Preferably, the polyol is selected from one or more of glycerol and triethylene glycol.

[0082] The content of polyols with a standard boiling point of 270°C or higher relative to the total amount of the inkjet composition is preferably 1 to 30% by mass, more preferably 5 to 25% by mass, even more preferably 10 to 20% by mass, particularly preferably 12 to 18% by mass, and even more preferably 13 to 16% by mass. When the content of polyols with a standard boiling point of 270°C or higher is within the above range, there is a tendency for better clogging recovery.

[0083] There is no particular limitation on the content of the organic solvent, but it is preferably 1% by mass or more, more preferably 5% by mass or more, further preferably 10% by mass or more, particularly preferably 15% by mass or more, and even more preferably 20% by mass or more, relative to the total amount of the inkjet composition. There is no particular limitation on the upper limit, but it is preferably 50% by mass or less, more preferably 40% by mass or less, further preferably 35% by mass or less, and particularly preferably 30% by mass or less, relative to the total amount of the inkjet composition. When the content of the organic solvent is within the above range, clogging recovery is sometimes excellent.

[0084] 1.5 water

[0085] The inkjet composition described in this embodiment may also contain water. There are no particular limitations on the type of water, but examples include pure water such as ion-exchanged water, ultrafiltered water, reverse osmosis water, and distilled water, as well as ultrapure water, which removes ionic impurities as much as possible. Furthermore, when water sterilized by ultraviolet irradiation or the addition of hydrogen peroxide is used, the growth of mold and bacteria can be prevented during long-term storage of the inkjet composition. Therefore, there is a tendency to further improve storage stability.

[0086] The water content relative to the total amount of the inkjet composition is preferably 50% by mass or more, more preferably 55% by mass or more, even more preferably 60% by mass or more, and particularly preferably 65% ​​by mass or more. Furthermore, there is no particular upper limit to the water content, but it is preferably 90% by mass or less relative to the total amount of the inkjet composition, more preferably 80% by mass or less.

[0087] 1.6 color materials

[0088] There are no particular restrictions on colorants, but examples include dyes or pigments. For example, water-soluble dyes, disperse dyes, and oil-based dyes can be used as dyes.

[0089] Examples of water-soluble dyes include: CI Acid Yellow 1, 3, 6, 11, 17, 18, 19, 23, 25, 36, 38, 40, 40:1, 42, 44, 49, 59, 59:1, 61, 65, 67, 72, 73, 79, 99, 104, 159, 169, 176, 184, 193, 200, 204, 207, 215, 219, 219:1, 220, 230, 232, 235, 241, 242, 246; CI Acid Orange 3, 7, 8, 10, 19, 22, 24, 51, 51S, 56, 67, 74, 80, 86, 87, 88, 89. 94, 95, 107, 108, 116, 122, 127, 140, 142, 144, 149, 152, 156, 162, 166, 168, CI Acid Red 1, 6, 8, 9, 13, 18, 27, 35, 37, 52, 54, 57, 60, 73, 82, 88, 97, 97:1, 106, 111, 114, 118, 119, 127, 131, 138, 143, 145, 151, 183, 195, 198, 211, 215, 217, 225, 226, 249, 251, 254, 256, 257, 260, 261, 265, 2 66, 274, 276, 277, 289, 296, 299, 315, 318, 336, 337, 357, 359, 361, 362, 364, 366, 399, 407, 415; CI Acid Violet 17, 19, 21, 42, 43, 47, 48, 49, 54, 66, 78, 90, 97, 102, 109, 126; CI Acid Blue 1, 7, 9, 15, 23, 25, 40, 61:1, 62, 72, 74, 80, 83, 90, 92, 103, 104, 112, 113, 114, 120, 127, 127:1, 128, 129, 13 8, 140, 142, 156, 158, 171, 182, 185, 193, 199, 201, 203, 204, 205, 207, 209, 220, 221, 224, 225, 229, 230, 239, 258, 260, 264, 277, 1, 278, 279, 280, 284, 290, 296, 298, 300, 317, 324, 333, 335, 338, 342, 350; CI Acid Green 9, 12, 16, 19, 20, 25, 27, 28, 40, 43, 56, 73, 81, 84, 104, 108, 109; CIAcid Brown: 2, 4, 13, 14, 19, 28, 44, 123, 224, 226, 227, 248, 282, 283, 289, 294, 297, 298, 301, 355, 357, 413; Acid Black (CI): 1, 2, 3, 24, 24:1, 26, 31, 50, 52, 52:1, 58, 60, 63, 63S, 107, 109, 112, 119, 132, 140, 155, 172, 187, 188, 194, 207, 222, etc.; Direct Yellow (CI): 8, 9, 10, 11, 12, 22, 27, 28, 39, 44, 50, 58, 8 6, 87, 98, 105, 106, 130, 137, 142, 147, 153; CI directly orange 6, 26, 27, 34, 39, 40, 46, 102, 105, 107, 118; CI directly red 2, 4, 9, 23, 24, 31, 54, 62, 69, 79, 80, 81, 83, 84, 89, 95, 212, 224, 225, 226, 227, 239, 242, 243, 254; CI directly purple 9, 35, 51, 66, 94, 95; CI directly blue 1, 15, 71, 76, 77, 78, 80, 86, 87, 90, 98, 106, 108 Direct dyes including: 160, 168, 189, 192, 193, 199, 200, 201, 202, 203, 218, 225, 229, 237, 244, 248, 251, 270, 273, 274, 290, 291; CI Direct Green 26, 28, 59, 80, 85; CI Direct Brown 44, 44:1, 106, 115, 195, 209, 210, 212:1, 222, 223; CI Direct Black 17, 19, 22, 32, 51, 62, 108, 112, 113, 117, 118, 132, 146, 154, 159, 169, etc.; CI Reactive Yellow. 2, 3, 7, 15, 17, 18, 22, 23, 24, 25, 27, 37, 39, 42, 57, 69, 76, 81, 84, 85, 86, 87, 92, 95, 102, 105, 111, 125, 135, 136, 137, 142, 143, 145, 151, 160, 161, 165, 167, 168, 175, 176; CI Reactive Orange 1, 4, 5, 7, 11, 12, 13, 15, 16, 20, 30, 35, 56, 64, 67, 69, 70, 72, 74, 82, 84, 86, 87, 91, 92, 93, 95, 107; CIReactive Red 2, 3, 3: 1, 5, 8, 11, 21, 22, 23, 24, 28, 29, 31, 33, 35, 43, 45, 49, 55, 56, 58, 65, 66, 78, 83, 84, 106, 111, 112, 113, 114, 116, 120, 123, 124, 128, 130, 136, 141, 147, 158, 159 171, 174, 180, 183, 184, 187, 190, 193, 194, 195, 198, 218, 220, 222, 223, 226, 228, 235; CI Reactive Violet 1, 2, 4, 5, 6, 22, 23, 33, 36, 38; CI Reactive Blue 2, 3, 4, 7, 13, 14, 15, 19, 21, 25, 27, 28, 29. 38, 39, 41, 49, 50, 52, 63, 69, 71, 72, 77, 79, 89, 104, 109, 112, 113, 114, 116, 119, 120, 122, 137, 140, 143, 147, 160, 161, 162, 163, 168, 171, 176, 182, 184, 191, 194, 195, 198 Reactive dyes include: 203, 204, 207, 209, 211, 214, 220, 221, 222, 231, 235, 236; CI Reactive Green 8, 12, 15, 19, 21; CI Reactive Brown 2, 7, 9, 10, 11, 17, 18, 19, 21, 23, 31, 37, 43, 46; CI Reactive Black 5, 8, 13, 14, 31, 34, 39, etc.

[0090] Examples of disperse dyes include CI Disperse Yellow 5, 42, 54, 64, 79, 82, 83, 93, 99, 100, 119, 122, 124, 126, 160, 184:1, 186, 198, 199, 204, 224, 237; CI Disperse Orange 13, 29, 31:1, 33, 49, 54, 55, 66, 73, 118, 119, 163; CI Disperse Red 54, 60, 72, 73, 86, 88, 91, 92, 93, 111, 126, 127, 134, 135, 143, 145, 152, 153, 154, 159, 164 , 167:1, 177, 181, 204, 206, 207, 221, 239, 240, 258, 277, 278, 283, 311, 323, 343, 348, 356, 362; CI Disperse Violet 33; CI Disperse Blue 56, 60, 73, 87, 113, 128, 143, 148, 154, 158, 165, 165:1, 165:2, 176, 183, 185, 197, 198, 201, 214, 224, 225, 257, 266, 267, 287, 354, 358, 365, 368; CI Disperse Green 6:1, 9, etc.

[0091] Examples of oil-based dyes include: CI solvent black 3, 7, 27, 29, 34; CI solvent yellow 14, 16, 19, 29, 56, 82; CI solvent red 1, 3, 8, 18, 24, 27, 43, 51, 72, 73, 132, 218; CI solvent violet 3; CI solvent blue 2, 11, 70; CI solvent green 3, 7; CI solvent orange 2, etc.

[0092] As pigments, various organic and inorganic pigments can be used. Examples include azo pigments such as azo lakes, insoluble azo pigments, condensed azo pigments, and chelated azo pigments; phthalocyanine pigments, perylene and perylene pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments, thioindolinone pigments, isoindolinone pigments, and quinophthalone pigments; dye lakes such as basic dye lakes and acid dye lakes; organic pigments such as nitro pigments and nitroso pigments; organic pigments such as aniline black and solar fluorescent pigments; and inorganic pigments such as carbon black.

[0093] The content of the pigment can be adjusted appropriately according to the application, but it is preferably 0.1% by mass or more and 17.0% by mass or less relative to the total amount of the inkjet composition, more preferably 0.2% by mass or more and 15.0% by mass or less, even more preferably 1.0% by mass or more and 10.0% by mass or less, and particularly preferably 2.0% by mass or more and 5.0% by mass or less. When the content of the pigment is within the above range, the inkjet head sometimes exhibits superior ejection performance.

[0094] 1.7 pH adjuster

[0095] The inkjet composition described in this embodiment may also contain a pH adjuster. There are no particular limitations on the pH adjuster, but examples include organic and inorganic bases. Examples of organic bases include alkanolates such as triethanolamine, diethanolamine, monoethanolamine, and triisopropanolamine. Examples of inorganic bases include hydroxides of alkali metals or alkaline earth metals, i.e., strong bases, such as lithium hydroxide, potassium hydroxide, and calcium hydroxide.

[0096] When the inkjet composition contains a pH adjuster, the content of the pH adjuster relative to the total amount of the inkjet composition is preferably 0.01 to 1.0% by mass, more preferably 0.03 to 0.5% by mass, even more preferably 0.05 to 0.3% by mass, and particularly preferably 0.07 to 0.15% by mass. When the content of the pH adjuster is within the above range, the dispersion stability of the colorant is improved, and sometimes the ejection performance of the inkjet head is even better.

[0097] 1.8 Other ingredients

[0098] The inkjet composition described in this embodiment may also appropriately contain various additives other than those mentioned above, such as resins, dispersants, preservatives / mildew inhibitors, chelating agents, waxes, softeners, cosolvents, viscosity modifiers, antioxidants, etc.

[0099] 2. Example

[0100] The present invention will be further described in detail below through examples, but the present invention is not limited to these examples. Hereinafter, "%" refers to a mass standard unless otherwise specified.

[0101] 2.1 Preparation of inkjet composition

[0102] The components were placed in a container as shown in Table 1 below, and mixed and stirred with a magnetic stirrer for 2 hours. The mixture was then further dispersed using a bead mill filled with 0.3 mm diameter zirconia beads to ensure thorough mixing. After stirring for 1 hour, the mixture was filtered using a 5 μm PTFE membrane filter to obtain the inkjet compositions described in the examples and comparative examples. Furthermore, pure water was added in such a way that the total amount of the inkjet composition was 100% by mass.

[0103]

[0104] The following supplementary explanations are provided regarding the information recorded in Table 1 above.

[0105] inkjet head

[0106] "X" in the table represents Figure 1The inkjet head described in the document. Additionally, "Y" in the table indicates the inkjet head described in Figure 10 of Japanese Patent Application Publication No. 2020-55305.

[0107] "Specific structure" refers to an inkjet head having: a nozzle plate having a plurality of nozzles; and a flow path substrate having a connection to one side of the nozzle plate, the flow path substrate having a flow path including a liquid reservoir for storing liquid for supplying to the plurality of nozzles, wherein the liquid reservoir is formed by a structure formed by a recess provided on the surface of the flow path substrate opposite to the nozzle plate.

[0108] Ink composition

[0109] color material

[0110] DB199 (CI direct blue 199)

[0111] surfactants

[0112] Surfynol DF110D (trade name manufactured by Nissin Chemical Industries, Ltd., an acetylenol-based surfactant)

[0113] Surfynol 104PG50 (trade name manufactured by Nissin Chemical Industry Co., Ltd., an acetylenol-based surfactant)

[0114] Surfynol SE-F (trade name manufactured by Nissin Chemical Industries, Ltd., an acetylenol-based surfactant)

[0115] •Olfine E1010 (trade name manufactured by Air Products, an acetylenic diol surfactant)

[0116] •Olfine E1020 (trade name manufactured by Air Products, an acetylenic diol surfactant)

[0117] other

[0118] ·TEGmBE (triethylene glycol monobutyl ether)

[0119] Surface tension

[0120] The surface tension of the ink was measured using an automatic surface tension meter CBVP-Z (trade name, manufactured by Kyowa Interface Science Co., Ltd.) when the ink was used to wet a platinum plate at 25°C.

[0121] 2.2 Evaluation Methods

[0122] 2.2.1NP (Nozzle Plate) Peeling (Erosion of Inkjet Head)

[0123] Immerse inkjet head X or inkjet head Y in the inkjet composition obtained above, place it at 80°C for 65 hours, visually observe the degree of adhesive peeling, and evaluate it according to the following judgment criteria.

[0124] Judgment Criteria

[0125] A: The ink has not penetrated the adhesive.

[0126] B: Some ink erosion exists on the wider areas where the edges and corners meet the ground surface.

[0127] C: Overall, there is ink erosion.

[0128] 2.2.2 Leakage Points

[0129] In an inkjet printer modified with the inkjet head described in Table 1 above (a modified version of the "PX-G930" manufactured by Seiko Epson Corporation), the inkjet composition obtained above was filled and 3,000 sheets were continuously printed. The results were evaluated according to the following criteria.

[0130] Judgment Criteria

[0131] A: There were no leaks during the printing of 3,000 copies.

[0132] B: A leak occurred during the printing of 3000 sheets, but it was corrected by cleaning (CL), and printing continued without problems afterward.

[0133] C: During the printing of 3000 sheets, a leak occurred. Although it was temporarily restored by CL (cleaning), the leak recurred.

[0134] 2.2.3 Blockage Recovery

[0135] In an inkjet printer modified with the inkjet head described in Table 1 above (a modified model of the "PX-G930", manufactured by Seiko Epson Corporation), the inkjet composition obtained above was filled and placed in an environment with the ink cartridge cover open for seven days at a temperature of 40°C and a humidity of 25%. Then, printing and cleaning (CL) in nozzle check mode were repeatedly performed, and the results were evaluated according to the following criteria.

[0136] Judgment Criteria

[0137] A: CL can be fully restored within three times.

[0138] B: CL fully recovered after four or more treatments.

[0139] 2.3 Evaluation Results

[0140] The evaluation results are shown in Table 1 above.

[0141] According to Table 1 above, the inkjet compositions in each embodiment can effectively reduce nozzle plate peeling and nozzle leakage. The inkjet composition is ejected from an inkjet head, which has: a nozzle plate having a plurality of nozzles; and a flow path substrate joined to one side of the nozzle plate. The flow path substrate has a flow path including a liquid reservoir for storing liquid for supplying to the plurality of nozzles. The liquid reservoir is formed by a recess on the surface of the flow path substrate opposite to the nozzle plate. The surface tension of the inkjet composition at 25°C is less than 31 mN / m.

[0142] Based on the comparison of each embodiment with Comparative Examples 1 to 2, it is evident that nozzle plate peeling can be effectively reduced by using an inkjet head with a specific structure.

[0143] Based on the comparison between each embodiment and Comparative Example 3, when the surface tension of the ink is below 31 mN / m, nozzle leakage can be effectively reduced.

[0144] The following content can be derived from the above implementation method.

[0145] One technical solution for an inkjet composition is an inkjet composition ejected from an inkjet head, the inkjet head having:

[0146] A nozzle plate having multiple nozzles; and

[0147] A flow path substrate, joined to one side of the nozzle plate, the flow path substrate forming a flow path including a liquid storage chamber for storing liquid to be supplied to the plurality of nozzles.

[0148] The liquid storage chamber is formed by a recess on the surface of the flow path substrate opposite to the nozzle plate.

[0149] The surface tension of the inkjet composition at 25°C is below 31 mN / m.

[0150] In one technical solution of the above-mentioned inkjet composition,

[0151] The inkjet composition may contain two or more surfactants.

[0152] In any of the above-mentioned inkjet compositions,

[0153] The surfactant may include surfactant A with an HLB value of 3 to 8.

[0154] In any of the above-mentioned inkjet compositions,

[0155] The surfactant may include surfactant B with an HLB value of 12 to 16.

[0156] In any of the above-mentioned inkjet compositions,

[0157] Let M be the content of surfactant B relative to the total mass of the inkjet composition. B Let M be the content of surfactant A relative to the total mass of the inkjet composition. A When, the content ratio (M) B / M A The value can be 1.5 to 4.0.

[0158] In any of the above-mentioned inkjet compositions,

[0159] The inkjet composition may contain polyols with a standard boiling point of 270°C or higher.

[0160] In any of the above-mentioned inkjet compositions,

[0161] The flow path may include a first flow path for conveying the inkjet composition from the liquid storage chamber and a second flow path for conveying the inkjet composition from the first flow path to the nozzle, wherein the cross-sectional area of ​​the first flow path is smaller than the cross-sectional area of ​​the second flow path.

[0162] This invention is not limited to the embodiments described above and can be modified in various ways. For example, this invention includes structures that are substantially the same as those described in the embodiments, such as structures with the same function, method, and result, or structures with the same purpose and effect. Additionally, this invention includes structures in which non-substantial parts of the structures described in the embodiments are replaced. Furthermore, this invention includes structures that can achieve the same function or effect as those described in the embodiments, or structures that achieve the same purpose. Additionally, this invention includes structures in which known techniques are added to the structures described in the embodiments.

Claims

1. An inkjet composition, characterized in that, The inkjet composition is ejected from the inkjet head, the inkjet head having: The nozzle plate has multiple nozzles. as well as A flow path substrate, joined to one side of the nozzle plate, the flow path substrate forming a flow path including a liquid storage chamber for storing liquid to be supplied to the plurality of nozzles. The liquid storage chamber is formed by a recess on the surface of the flow path substrate opposite to the nozzle plate. The surface tension of the inkjet composition at 25°C is below 31 mN / m. The inkjet composition contains two or more surfactants. The surfactants include surfactant A with an HLB value of 3 to 8 and surfactant B with an HLB value of 12 to 16. Let M be the content of surfactant B relative to the total mass of the inkjet composition. B Let M be the content of surfactant A relative to the total mass of the inkjet composition. A At that time, the content was higher than that of M. B / M A It ranges from 1.5 to 2.

5.

2. The inkjet composition according to claim 1, characterized in that, The HLB value of surfactant A is 4 to 5.

3. The inkjet composition according to claim 1 or 2, characterized in that, The HLB value of surfactant B is 12 to 14.

4. The inkjet composition according to claim 3, characterized in that, Let M be the content of surfactant B relative to the total mass of the inkjet composition. B Let M be the content of surfactant A relative to the total mass of the inkjet composition. A At that time, the content was higher than that of M. B / M A It ranges from 1.5 to 2.

2.

5. The inkjet composition according to claim 1 or 2, characterized in that, The inkjet composition contains a polyol with a standard boiling point of 270°C or higher.

6. The inkjet composition according to claim 1 or 2, characterized in that, The flow path includes a first flow path for conveying the inkjet composition from the liquid storage chamber and a second flow path for conveying the inkjet composition from the first flow path to the nozzle, wherein the cross-sectional area of ​​the first flow path is smaller than the cross-sectional area of ​​the second flow path.

Images