Inkjet recording method

Abstract

This invention provides an inkjet recording method that uses a reaction solution, a transparent ink composition, and a white ink composition to reduce bleeding of printed materials and achieve both good color development and friction fastness. [Solution] The method comprises: a reaction solution application step in which a reaction solution containing a flocculant and water is applied to a fabric by an inkjet method; a transparent ink application step in which a transparent ink composition containing anionic resin particles and water is applied to the fabric by an inkjet method; and a white ink application step in which a white ink composition containing a white pigment, resin particles and water is applied to the area of ​​the fabric to which the transparent ink composition has been applied by an inkjet method, wherein the application area of ​​the transparent ink composition has an application amount of 0.029 g / inch 2 The region has an area where the amount of the white ink composition is greater than or equal to 0.230 g / inch 2 An inkjet recording method having the following region.

Description

Technical Field

[0001] The present invention relates to an inkjet recording method.

Background Art

[0002] In the inkjet recording method, when printing on a textile product, a printing method using a pretreatment liquid, a transparent ink, and a white ink is used to improve color development, reduce bleeding, and improve rubbing fastness.

[0003] For example, Patent Document 1 describes an inkjet printing method including a step of applying a pretreatment liquid containing a polyvalent cation and / or a salt of an acid, a step of applying by jetting a transparent ink containing a polymer binder, a step of applying by jetting a white ink, and a step of applying by jetting a non-white colored ink.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the prior art, it has been difficult to simultaneously achieve good color development, bleeding, and rubbing fastness.

Means for Solving the Problems

[0006] One aspect of the inkjet recording method according to the present invention is a reaction liquid adhesion step of adhering a reaction liquid containing a flocculant and water to a fabric by an inkjet method, a transparent ink adhesion step of adhering a transparent ink composition containing anionic resin particles and water to the fabric by an inkjet method, A white ink composition containing a white pigment, resin particles, and water is applied by an inkjet method onto the region of the fabric where the transparent ink composition is adhered, in a white ink application step. It has The adhered region of the transparent ink composition has a region where the adhesion amount of the transparent ink composition is 0.029 g / inch 2 or more. The adhered region of the white ink composition has a region where the adhesion amount of the white ink composition is 0.230 g / inch 2 or less. This is an inkjet recording method.

Brief Description of Drawings

[0007] [Figure 1] Perspective view of a serial printer. [Figure 2] Schematic diagram showing an example of the nozzle row arrangement of an inkjet head. [Figure 3] Schematic side view of a line printer. [Figure 4] Table 1 showing composition examples of a reaction solution, a transparent ink composition, and a white ink composition. [Figure 5] Table 2 showing the recording conditions of the inkjet recording method according to each example. [Figure 6] Table 3 showing the recording conditions of the inkjet recording method according to each example. [Figure 7] Table 4 showing the recording conditions of the inkjet recording method according to each comparative example. [Figure 8] Table 5 showing the evaluation results according to each example. [Figure 9] Table 6 showing the evaluation results according to each comparative example.

Modes for Carrying Out the Invention

[0008] Embodiments of the present invention will be described below. The embodiments described below are examples of the present invention. The present invention is not limited in any way to the embodiments described below, and includes various modifications that can be implemented without changing the gist of the present invention. Not all of the configurations described below are necessarily essential to the present invention.

[0009] In this specification, a numerical range represented by "~" means a range that includes the numbers written before and after "~" as the lower and upper limits, respectively.

[0010] In this specification, "inkjet method" refers to the inkjet droplet ejection method.

[0011] In this specification, the term "white" when referring to white pigments, white ink compositions, etc., does not refer only to pure white, but also includes chromatic colors, slightly colored achromatic colors, and glossy colors, as long as they are visible as white. For example, in CIELAB, L * It is preferable that L be 80 or higher. * It is more preferable that the value is 85 or higher.

[0012] In this specification, "(meth)acrylic" means acrylic or methacrylic.

[0013] 1. Inkjet recording method An inkjet recording method according to an embodiment of the present invention comprises: a reaction solution application step of applying a reaction solution containing a flocculant and water to a fabric by an inkjet method; a transparent ink application step of applying a transparent ink composition containing anionic resin particles and water to a fabric by an inkjet method; and a white ink application step of applying a white ink composition containing a white pigment and water to an area of ​​the fabric to which the transparent ink composition has been applied by an inkjet method, wherein the area to which the transparent ink composition has been applied has a transparent ink composition application amount of 0.029 g / inch 2 The region has an area of ​​the above, and the area where the white ink composition adheres has an adhesion amount of 0.230 g / inch. 2It has the following region:

[0014] Conventionally, in inkjet recording, a method using a pretreatment solution, transparent ink, and white ink has been employed to achieve higher color vibrancy and durability, especially on colored fabrics. With the above recording method, the resin in the transparent ink aggregates on the fabric due to the pretreatment solution, and the adhesion of the applied white and non-white inks is further improved, resulting in good color development and friction fastness.

[0015] However, the amount of transparent and white ink applied affects the effectiveness of the above-mentioned effects. If there is too little transparent ink, the coagulation effect of the pretreatment solution is reduced, and the color development deteriorates. If there is too much white ink, bleeding increases, and friction fastness decreases.

[0016] In contrast, according to the inkjet recording method of this embodiment, the resin particles in the transparent ink composition aggregate due to the flocculant in the reaction solution, and a layer of the transparent ink composition (hereinafter also referred to as the "resin layer") is formed near the surface of the fabric. By adhering the white ink composition onto the formed resin layer, the penetration of the white ink composition into the fabric is reduced, and the occurrence of show-through and bleeding can be reduced. Therefore, even if the amount of white ink composition adhered is relatively small, the printed material will exhibit good color development. In addition, the layer of transparent ink composition functions as a binding layer for the white ink composition, thereby providing good friction fastness.

[0017] Here, since the fabric absorbs the attached ink composition, if the amount attached is small, the transparent ink composition is less likely to remain near the surface of the fabric, and a resin layer cannot be formed. Therefore, by attaching a predetermined amount or more of the transparent ink composition, a good resin layer can be formed, thereby improving color development and friction fastness.

[0018] Furthermore, increasing the white pigment content tends to increase the likelihood of bleeding and decrease friction fastness. Therefore, by applying a predetermined amount or less of the white ink composition, it is possible to reduce bleeding and improve friction fastness.

[0019] The steps of the inkjet recording method according to this embodiment will be described in detail below.

[0020] 1.1. Reaction solution application process The inkjet recording method according to this embodiment includes a reaction solution attachment step in which a reaction solution containing a coagulant and water is attached to a fabric by an inkjet method.

[0021] 1.1.1. Adhesion Patterns In the inkjet recording method according to this embodiment, the reaction solution application step and the transparent ink application step described later may be performed by scanning the same area of ​​the fabric with a single pass of the inkjet head. By applying the reaction solution and transparent ink to the same area, a resin layer is formed near the surface of the fabric, which reduces bleed-through and bleeding of the white ink applied on the resin layer and allows for good color development.

[0022] Here, "scanning" refers to moving the inkjet head relative to the recording area on the fabric. In this case, the inkjet head may move relative to the fabric, or the fabric may move relative to the inkjet head. Furthermore, the relative positional relationship between the inkjet head and the fabric may change as both move.

[0023] The inkjet head can be mounted on a carriage, for example. The inkjet head may be moved as the carriage moves; in this case as well, it is the movement of the inkjet head.

[0024] Therefore, in the serial inkjet recording device 20 shown in Figure 1, for example, "scanning" is performed while the carriage 234 having the inkjet head 231 moves in a scanning direction SD that intersects the transport direction TD of the recording medium F.

[0025] On the other hand, "scanning," for example, in a line-type inkjet recording device 1 as shown in Figure 3, involves recording being performed while the recording medium F moves relative to a line head 300 having a length corresponding to the width of the recording medium F in a direction intersecting the width direction. In line-type recording, the inkjet head (line head) remains fixed and does not move during recording, and recording is performed in a single scan.

[0026] The number of times the same scan is performed on the same area of ​​the fabric may be one or more times.

[0027] When the same area of ​​fabric is scanned multiple times, the inkjet head that ejects the reaction solution and transparent ink passes over that area of ​​fabric multiple times. The more times it is scanned, the more evenly the reaction solution and transparent ink can be applied to the desired area, which tends to improve the image quality of the resulting print.

[0028] More specifically, for example, in Figure 1, if the length of one transport of the recording medium F in the transport direction TD is one-quarter the length of the transport direction TD in the nozzle row of the inkjet head that is arranged in a direction intersecting the scanning direction SD, then four scans will be performed on the same part (same region) of a rectangular scanning area that is the length of one transport direction TD in the transport direction TD and extends in the scanning direction SD.

[0029] When performing the same scan multiple times, from the viewpoint of achieving better image quality, 2 or more is preferable, 3 or more is more preferable, 4 or more is even preferable, and 6 or more is particularly preferable. There is no upper limit, but from the viewpoint of achieving better productivity, 24 or less is preferable, 12 or less is more preferable, and 8 or less is even preferable.

[0030] The difference in the adhesion time in the same area of the reaction liquid and the transparent ink composition is preferably within 30 seconds, more preferably within 5 seconds, still more preferably within 1 second, and particularly preferably within 0.05 seconds. When the difference in the adhesion time is within the above range, the transparent ink composition adheres before the reaction liquid adhering to the fabric penetrates, so that the resin layer can be formed well. Therefore, the color development property of the white ink adhered on the resin layer becomes good.

[0031] 1.1.2. Adhesion amount In the inkjet recording method according to the present embodiment, the total of the adhesion amount of the reaction liquid and the adhesion amount of the transparent ink composition described later is preferably 0.27 g / inch 2 or more. When the total of the adhesion amount of the reaction liquid and the adhesion amount of the transparent ink composition is the above value or more, the layer of the transparent ink composition has a sufficient thickness, and the color development and rubbing fastness of the white ink composition to be further adhered become good. Further, the upper limit of the total of the above adhesion amounts is not particularly limited, but is preferably 0.50 g / inch 2 or less, and more preferably 0.40 g / inch 2 or less.

[0032] The ratio of the adhesion amount of the reaction liquid to the adhesion amount of the transparent ink composition is preferably 1:10 to 10:1, more preferably 3:10 to 10:3, still more preferably 5:10 to 10:5, particularly preferably 7:10 to 10:7, and even more particularly preferably 9:10 to 10:9. When the ratio of the adhesion amounts is within the above range, the resin layer is formed well near the surface of the fabric, and the color development property of the white ink adhered on the resin layer becomes good.

[0033] 1.1.3. Reaction liquid The reaction liquid in the inkjet recording method according to the present embodiment contains a flocculant and water. Each component contained in the reaction liquid will be described below.

[0034] 1.1.3.1. Flocculant The reaction solution contains a flocculant that aggregates the components in the ink. The flocculant acts on the dispersibility of components such as anionic resin particles in the transparent ink composition and colorants and resin particles in the white ink composition, and has the function of agglomerating at least one of these components.

[0035] The degree of aggregation of a dispersion by a coagulant varies depending on the type of coagulant and the target material, and can be adjusted. This coagulation can, for example, improve the color development and image fixation of an image.

[0036] Examples of flocculants include organic acids, polyvalent metal salts, and cationic polymers. It is preferable that the flocculant contains an organic acid. When an organic acid is included in the flocculant, the viscosity of the reaction solution is improved, and the thickness of the resin layer formed near the surface of the fabric can be ensured.

[0037] Examples of organic acids include poly(meth)acrylic acid, formic acid, acetic acid, propionic acid, glycolic acid, oxalic acid, malonic acid, malic acid, maleic acid, ascorbic acid, succinic acid, glutaric acid, adipic acid, fumaric acid, citric acid, tartaric acid, lactic acid, pyruvate, pyrrolidone carboxylic acid, pyrrone carboxylic acid, pyrrole carboxylic acid, furanic acid, pyridine carboxylic acid, coumaric acid, thiophene carboxylic acid, nicotinic acid, or derivatives of these compounds, or salts thereof.

[0038] The organic acid is preferably lactic acid. The inclusion of lactic acid in the flocculant improves the flocculation effect even with a small amount of reaction solution, allowing for the formation of a good layer of the transparent ink composition.

[0039] Organic acids may be used individually or in combination of two or more. Note that salts of organic acids that are metal salts are included in the section on metal salts, which will be discussed later.

[0040] The flocculation effect of organic acids is influenced by the amount of acidic groups of the organic acid adhering to the fabric. The amount of acidic groups adhering can be calculated from the amount of reaction solution adhering, the concentration of the organic acid in the reaction solution, and the molecular weight and valency of the organic acid.

[0041] The amount of acidic groups of the organic acid adhering to the fabric is preferably 9.7 × 10 -7 mol / inch 2 The above is more preferable, 1.5 × 10 -6 mol / inch 2 The above, and more preferably 3.0 × 10 -6 mol / inch 2 This concludes the explanation. When the amount of acidic groups of the organic acid is within the above range, the resin particles in the transparent ink composition can be further aggregated, and the resin layer is formed to a suitable thickness. Because the resin layer has sufficient thickness, bleed-through and smudging of the white ink composition that is further applied are reduced, and the white ink composition exhibits good color development.

[0042] Furthermore, the amount of acidic groups of the organic acid attached is preferably 1.0 × 10⁻⁶. -5 mol / inch 2 The following, more preferably 7.0 × 10 -6 mol / inch 2 The following applies:

[0043] A polyvalent metal salt is a compound composed of two or more valent metal ions and anions. Examples include compounds containing ions of calcium, magnesium, copper, nickel, zinc, barium, aluminum, titanium, strontium, chromium, cobalt, and iron. Among the metal ions that make up these polyvalent metal salts, it is preferable that at least one of calcium ions and magnesium ions is used, given its excellent ability to aggregate the ink components.

[0044] The anions that constitute polyvalent metal salts can be inorganic or organic ions. Examples of such inorganic ions include chloride ions, bromide ions, iodide ions, formate ions, nitrate ions, sulfate ions, and hydroxide ions. Examples of organic ions include organic acid ions, such as carboxylate ions.

[0045] Specific examples of the polyvalent metal salts mentioned above include calcium carbonate such as heavy calcium carbonate and light calcium carbonate, calcium formate, calcium nitrate, calcium chloride, calcium sulfate, magnesium sulfate, calcium hydroxide, magnesium chloride, magnesium carbonate, barium sulfate, barium chloride, zinc carbonate, zinc sulfide, aluminum silicate, calcium silicate, magnesium silicate, copper nitrate, calcium acetate, magnesium acetate, aluminum acetate, calcium propionate, magnesium propionate, aluminum propionate, calcium lactate, magnesium lactate, and aluminum lactate. These polyvalent metal salts may be used individually or in combination of two or more.

[0046] Among these, at least one of magnesium sulfate, calcium formate, calcium nitrate, aluminum lactate, or calcium propionate is preferred because it provides sufficient solubility in water. These metal salts may be those that have water of hydration in their raw material form, such as magnesium sulfate heptahydrate or calcium nitrate tetrahydrate.

[0047] Cationic polymers refer to polymer compounds that possess cationic groups. Examples of cationic polymers include cationic urethane resins, cationic olefin resins, cationic amine resins, and cationic amide resins.

[0048] Cationic amine resins can be any resin having an amino group, such as allylamine resins, polyamine resins, and quaternary ammonium salt polymers.

[0049] Allylamine resins include those having a structure derived from an allyl group in the main skeleton of the resin. Polyamine resins include those having an amino group in the main skeleton of the resin. Quaternary ammonium salt polymers include resins having a quaternary ammonium salt in their structure. Among cationic polymers, cationic amine resins are preferred not only because of their excellent reactivity but also because they are readily available.

[0050] The flocculant may be used alone or in combination of two or more types.

[0051] From the viewpoint of achieving superior color development and reduced bleeding, the coagulant content is preferably 0.5% by mass or more, more preferably 1% by mass or more, even more preferably 2% by mass or more, and particularly preferably 3% by mass or more, relative to the total amount of the reaction solution.

[0052] Furthermore, the amount of flocculant is not particularly limited, but for example, it is preferably 20% by mass or less, more preferably 15% by mass or less, even more preferably 10% by mass or less, even more preferably 8% by mass or less, and particularly preferably 6% by mass or less, based on the total amount of the reaction solution.

[0053] 1.1.3.2.Water The reaction solution contains 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, which has reduced ionic impurities. Furthermore, using water sterilized by ultraviolet irradiation or the addition of hydrogen peroxide can suppress the growth of bacteria and fungi when the reaction solution is stored for a long period of time.

[0054] The water content is preferably 40% by mass or more, more preferably 45% by mass or more, even more preferably 50% by mass or more, and particularly preferably 60% by mass or more, relative to the total amount of the reaction solution. There is no particular upper limit to the water content, but for example, it is preferably 90% by mass or less, more preferably 85% by mass or less, and even more preferably 80% by mass or less, relative to the total amount of the reaction solution.

[0055] 1.1.3.3. Organic Solvents The reaction solution may contain an organic solvent. Examples of organic solvents include esters, alkylene glycol ethers, cyclic esters, amides, alcohols, and polyhydric alcohols.

[0056] Examples of esters include glycol monoacetates and glycol diesters.

[0057] The alkylene glycol ethers can be monoethers or diethers of alkylene glycols, with alkyl ethers being preferred. Specific examples include alkylene glycol monoalkyl ethers such as ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, triethylene glycol monobutyl ether, and tetraethylene glycol monomethyl ether; and alkylene glycol dialkyl ethers such as ethylene glycol dimethyl ether, diethylene glycol dibutyl ether, triethylene glycol diethyl ether, and tripropylene glycol dimethyl ether.

[0058] Examples of cyclic esters include cyclic esters (lactones) such as β-propiolactone, γ-butyrolactone, δ-valerolactone, and ε-caprolactone, as well as compounds in which the hydrogen atoms of the methylene group adjacent to the carbonyl group are substituted with alkyl groups having 1 to 4 carbon atoms.

[0059] Examples of amides include cyclic amides and acyclic amides. Examples of acyclic amides include alkoxyalkyl amides.

[0060] Examples of cyclic amides include lactams. Examples of lactams include pyrrolidones such as 2-pyrrolidone, 1-methyl-2-pyrrolidone, 1-ethyl-2-pyrrolidone, 1-propyl-2-pyrrolidone, and 1-butyl-2-pyrrolidone.

[0061] Examples of alkoxyalkylamides include 3-methoxy-N,N-dimethylpropionamide, 3-methoxy-N,N-diethylpropionamide, and 3-methoxy-N,N-methylethylpropionamide.

[0062] Examples of alcohols include compounds in which one hydrogen atom of an alkane is replaced by a hydroxyl group. Alkanes with 10 or fewer carbon atoms are preferred, those with 6 or fewer carbon atoms are more preferred, and those with 3 or fewer carbon atoms are even more preferred. Alkanes have 1 or more carbon atoms, preferably 2 or more. Alkanes may be linear or branched.

[0063] Examples of alcohols include methanol, ethanol, n-propyl alcohol, iso-propyl alcohol, n-butanol, 2-butanol, tert-butanol, iso-butanol, n-pentanol, 2-pentanol, 3-pentanol, and tert-pentanol, 2-phenoxyethanol, benzyl alcohol, and phenoxypropanol.

[0064] Polyhydric alcohols are molecules that contain two or more hydroxyl groups. Polyhydric alcohols can be further classified into, for example, alkanediols and polyols.

[0065] Alkanediols include, for example, compounds in which an alkane is substituted with two hydroxyl groups. Examples of alkanediols include 1,2-alkanediols, which are a general term for compounds in which hydroxyl groups are substituted at the 1st and 2nd positions of an alkane, and other alkanediols other than 1,2-alkanediols.

[0066] Examples of 1,2-alkanediols include ethylene glycol, 1,2-propanediol (propylene glycol), and 1,2-butanediol (1,2BD).

[0067] Other examples of alkanediols include 1,3-propanediol, 1,3-butylene glycol (also known as 1,3-butanediol), 1,4-butanediol, 2,3-butanediol, and 1,5-pentanediol.

[0068] Examples of polyols include condensates formed by the intermolecular condensation of two or more alkanediol molecules via hydroxyl groups, and compounds having three or more hydroxyl groups.

[0069] Examples of condensates formed by the intermolecular condensation of two or more alkanediol molecules at their hydroxyl groups include dialkylene glycols such as diethylene glycol and dipropylene glycol, and trialkylene glycols such as triethylene glycol and tripropylene glycol.

[0070] 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 glycerin, trimethylolethane, trimethylolpropane, 1,2,5-hexanetriol, 1,2,6-hexanetriol, pentaerythritol, and polyoxypropylenetriol.

[0071] Organic solvents may be used individually or in combination of two or more types.

[0072] Among these, the organic solvent preferably contains alkanediols, more preferably 1,2-alkanediols, and particularly preferably propylene glycol. When the organic solvent contains these solvents, a resin layer can be formed well near the surface of the fabric. As a result, the color development of the printed material tends to be good.

[0073] The content of the organic solvent is preferably 5 to 50% by mass, more preferably 10 to 40% by mass, even more preferably 15 to 35% by mass, and particularly preferably 20 to 30% by mass, relative to the total amount of the reaction solution. When the content of the organic solvent is within the above range, the color development of the printed material tends to be good.

[0074] 1.1.3.4. Surfactants The reaction solution may contain a surfactant. The surfactant can be used to lower the surface tension of the reaction solution, for example, to adjust or improve its permeability to fabrics. Any of the following surfactants can be used: nonionic surfactants, anionic surfactants, cationic surfactants, or amphoteric surfactants, and these may be used in combination. Among surfactants, acetylene-based surfactants (acetylene glycol-based surfactants), silicone-based surfactants, and fluorine-based surfactants are more preferably used, and acetylene-based surfactants are even more preferably used.

[0075] Acetylene-based surfactants (acetylene glycol-based surfactants) are not particularly limited, but examples include Surfinol 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, DF110D (product names, Air Products and Chemicals) Examples include Orphine B, Y, P, A, STG, SPC, E1004, E1010, PD-001, PD-002W, PD-003, PD-004, PD-005, EXP.4001, EXP.4036, EXP.4051, EXP.4123, EXP.4200, EXP.4300, AF-103, AF-104, AK-02, SK-14, AE-3 (product names, manufactured by Nisshin Chemical Industry Co., Ltd.), and Acetyleneol E00, E00P, E40, E100 (product names, manufactured by Kawaken Fine Chemical Co., Ltd.).

[0076] While not particularly limited, polysiloxane compounds are preferred as silicone-based surfactants. Examples of polysiloxane compounds include polyether-modified organosiloxanes. Examples of commercially available polyether-modified organosiloxanes include BYK-306, BYK-307, BYK-333, BYK-341, BYK-345, BYK-346, BYK-348 (product names, manufactured by BIC Chemie Japan Co., Ltd.), 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-6004, KF-6011, KF-6012, KF-6015, and KF-6017 (product names, manufactured by Shin-Etsu Chemical Co., Ltd.).

[0077] As the fluorine-based surfactant, it is preferable to use a fluorine-modified polymer, and a specific example is BYK-340 (trade name, manufactured by BYK-Chemie Japan Co., Ltd.).

[0078] Surfactants may be used individually or in combination of two or more types.

[0079] The surfactant content is preferably 5.0% by mass or less, more preferably 3.0% by mass or less, even more preferably 2.0% by mass or less, particularly preferably 1.5% by mass or less, and most particularly preferably 1.0% by mass or less, relative to the total amount of the reaction solution. When the surfactant content is within the above range, and especially 2.0% by mass or less, the viscosity of the equal-volume mixture when the reaction solution and the transparent ink composition are mixed tends to increase, allowing for better formation of a resin layer near the surface of the fabric. As a result, the color development of the white ink composition attached to the resin layer can be improved, and bleeding can be reduced.

[0080] The surfactant content is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and even more preferably 0.5% by mass or more, relative to the total amount of the reaction solution.

[0081] 1.1.3.5. Other Ingredients The reaction solution may contain additives as needed, such as pH adjusters, preservatives, fungicides, rust inhibitors, chelating agents, viscosity modifiers, solubilizers, and antioxidants. When additives are included, the additive content is preferably 0.05 to 5% by mass, more preferably 0.1 to 3% by mass, and even more preferably 0.1 to 1% by mass, relative to the total amount of the reaction solution.

[0082] Furthermore, the reaction solution may contain colorants such as pigments, but it is preferable that the amount is 0.2% by mass or less, more preferably 0.1% by mass or less, even more preferably 0.05% by mass or less, and it is particularly preferable that it does not contain any colorants.

[0083] 1.1.4. Physical Properties The viscosity of the reaction solution is preferably 3 mPa·s to 10 mPa·s at 20°C, more preferably 3.5 mPa·s to 9 mPa·s, and even more preferably 4 mPa·s to 8 mPa·s. When the viscosity of the reaction solution is within the above range, the ejection stability tends to be good during printing.

[0084] Furthermore, the viscosity of the mixture obtained by mixing equal amounts of the reaction solution and the transparent ink composition described later (hereinafter also referred to as the "equal mixture") is preferably 50 mPa·s or more, more preferably 100 mPa·s or more, even more preferably 1000 mPa·s or more, and particularly preferably 10000 mPa·s or more, at 20°C, for example, after 3 minutes after mixing. When the viscosity of the equal mixture is within the above range, penetration into the fabric is slowed, the transparent ink composition tends to remain near the surface of the fabric, and a resin layer is formed well. As a result, show-through and bleeding of the white ink composition are reduced, and the color development is improved.

[0085] The viscosity of the equal-volume mixture is not particularly limited, but is preferably 20,000 mPa·s or less, and more preferably 15,000 mPa·s or less.

[0086] Viscosity can be measured, for example, using a viscoelasticity tester MCR-302e (manufactured by Anton Paar).

[0087] The surface tension of the reaction solution is preferably 25 to 40 mN / m, more preferably 25 to 35 mN / m, even more preferably 27 to 35 mN / m, and particularly preferably 30 to 33 mN / m. The surface tension can be measured, for example, by the Wilhelmy method using a surface tensimeter (DY-300, manufactured by Kyowa Interface Science Co., Ltd.). The surface tension is preferably measured at 20°C.

[0088] 1.2. Transparent ink application process The inkjet recording method according to this embodiment includes a transparent ink application step in which a transparent ink composition containing anionic resin particles and water is applied to a fabric by an inkjet method.

[0089] 1.2.1. Adhesion Pattern The method of adhesion in the transparent ink adhesion process shall be in accordance with section "1.1.1. Adhesion Method".

[0090] 1.2.2. Amount of adhesion In the inkjet recording method according to this embodiment, the adhesion area of ​​the transparent ink composition is such that the adhesion amount of the transparent ink composition is 0.029 g / inch. 2 The area where the transparent ink composition is attached has a range greater than or equal to the above-mentioned attachment amount. When the area where the transparent ink composition is attached has a range greater than or equal to the above-mentioned attachment amount, a resin layer of the transparent ink composition is well formed on the fabric, and the white ink composition attached to the resin layer exhibits good color development. In addition, the resin layer and the white ink composition bond together, improving friction fastness. The area where the transparent ink composition is attached has an attachment amount of 0.030 g / inch. 2 Preferably, it has the above range, 0.040 g / inch 2 It is more preferable to have the above range, 0.050 g / inch 2 It is even more preferable to have the above range, 0.06 g / inch 2 It is particularly preferable to have the above region, 0.070 g / inch 2It is particularly preferable that the above regions are present. Furthermore, the adhesion region of the transparent ink composition is not particularly limited, but the adhesion amount is 0.300 g / inch. 2 Preferably, it is 0.250 g / inch 2 It is more preferable that the following is true: 0.200 g / inch 2 The following is even more preferable:

[0091] Furthermore, the total amount of reaction solution and the amount of transparent ink composition that adheres, as well as their ratio, are as described in section "1.1.2. Amount of Adhesion".

[0092] 1.2.3. Transparent Ink Compositions The transparent ink composition in the inkjet recording method according to this embodiment contains anionic resin particles and water. The components contained in the transparent ink composition are described below.

[0093] 1.2.3.1. Anionic resin particles The transparent ink composition contains anionic resin particles. These anionic resin particles function as a fixing resin, improving the adhesion of the ink to the fabric. Furthermore, the anionic resin particles react with the aforementioned flocculant to aggregate, thereby thickening the transparent ink composition. While the anionic resin particles are often handled in emulsion form, they may also be in powder form.

[0094] "Anionic resin particles" refer to resin particles that have a negative charge as a whole, and it is preferable that they have one or more anionic groups selected from carboxyl groups, sulfonic acid groups, phosphate groups, etc.

[0095] The anionic resin particles are more preferably urethane resin or acrylic resin, and even more preferably urethane resin. In this case, the frictional fastness tends to be superior.

[0096] Urethane resin is a general term for resins that have urethane bonds. In addition to urethane bonds, urethane resins may also be polyether-type urethane resins containing ether bonds in the main chain, ester-type urethane resins containing ester bonds in the main chain, or carbonate-type urethane resins containing carbonate bonds in the main chain. Commercially available urethane resins may also be used, such as Superflex 460, 460s, 840, E-4000 (product names, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), Rezamin D-1060, D-2020, D-4080, D-4200, D-6300, D-6455 (product names, manufactured by Dainichi Seika Kogyo Co., Ltd.), Takelac WS-5100, WS-6021, W-512-A-6 (product names, manufactured by Mitsui Chemicals Polyurethane Co., Ltd.), SanCure 2710 (product name, manufactured by LUBRIZOL), and Permarin UA-150 (product name, manufactured by Sanyo Chemical Industries, Ltd.).

[0097] Acrylic resin is a general term for polymers obtained by polymerizing at least one acrylic monomer, such as (meth)acrylic acid or (meth)acrylic acid ester. Examples include resins obtained from acrylic monomers and copolymers of acrylic monomers with other monomers. For example, acrylic-vinyl resin, which is a copolymer of acrylic monomers and vinyl monomers, is an example. For example, styrene can be used as a vinyl monomer.

[0098] Acrylic monomers such as acrylamide and acrylonitrile can also be used. For resin emulsions made from acrylic resin, commercially available products may be used, for example, selected from FK-854 (trade name, manufactured by Chuo Rika Kogyo Co., Ltd.), Movinyl 952B, 718A (trade name, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), Nipol LX852, LX874 (trade name, manufactured by Nippon Zeon Co., Ltd.).

[0099] Styrene-acrylic resins are copolymers obtained from styrene monomers and (meth)acrylic monomers, and examples include styrene-acrylic acid copolymers, styrene-methacrylic acid copolymers, styrene-methacrylic acid-acrylic acid ester copolymers, styrene-α-methylstyrene-acrylic acid copolymers, and styrene-α-methylstyrene-acrylic acid-acrylic acid ester copolymers. For the styrene-acrylic resin, commercially available products may be used, such as Joncryl 62J, 7100, 390, 711, 511, 7001, 632, 741, 450, 840, 74J, HRC-1645J, 734, 852, 7600, 775, 537J, 1535, PDX-7630A, 352J, 352D, PDX-7145, 538J, 7640, 7641, 631, 790, 780, 7610 (product names, manufactured by BASF), Movinyl 966A, 975N (product names, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), Vinibran 2586 (manufactured by Nisshin Chemical Industry Co., Ltd.), etc.

[0100] The glass transition temperature (Tg) of the anionic resin particles is preferably between -60°C and 50°C, more preferably between -60°C and 40°C, and even more preferably between -30°C and 10°C. A glass transition temperature (Tg) within this range tends to result in a better texture for printed materials. The glass transition temperature is measured, for example, using a differential scanning calorimeter "DSC7000" manufactured by Hitachi High-Tech Science Corporation, in accordance with JIS K7121 (Method for measuring the transition temperature of plastics).

[0101] The content of anionic resin particles (solid content concentration) is preferably 1 to 30% by mass, more preferably 2 to 25% by mass, even more preferably 4 to 20% by mass, particularly preferably 6 to 15% by mass, and most preferably 8 to 12% by mass, relative to the total amount of the transparent ink composition. When the content of anionic resin particles is within the above range, a resin layer is formed well, and better color development and friction fastness can be obtained.

[0102] 1.2.3.2.Water The transparent ink composition contains water. The water is as specified in section 1.1.3.2. Water.

[0103] The water content is preferably 20% by mass or more, more preferably 30% by mass or more, even more preferably 40% by mass or more, and particularly preferably 50% by mass or more, relative to the total amount of the transparent ink composition. There is no particular upper limit to the water content, but for example, it is preferably 90% by mass or less, more preferably 70% by mass or less, and more preferably 60% by mass or less, relative to the total amount of the transparent ink composition.

[0104] 1.2.3.3. Organic Solvents The transparent ink composition may contain an organic solvent. The organic solvent shall conform to the provisions of section "1.1.3.3. Organic Solvents".

[0105] The organic solvent in the transparent ink composition preferably contains alkanediols, alkylene glycol ethers, and trialkylene glycol; more preferably contains 1,2-alkanediols, alkylene glycol ethers, and trialkylene glycol; and even more preferably contains propylene glycol, triethylene glycol monobutyl ether, and triethylene glycol. When the organic solvent contains these solvents, a resin layer is formed well. As a result, the printed material exhibits good color development.

[0106] The content of the organic solvent is preferably 10% to 55% by mass, more preferably 15% to 45% by mass, and even more preferably 25% to 35% by mass, relative to the total amount of the transparent ink composition. When the content of the organic solvent is within the above range, the color development of the printed material tends to be good.

[0107] 1.2.3.4. Surfactants The transparent ink composition may contain a surfactant. The type of surfactant, etc., is as specified in section 1.1.3.4. Surfactants. Preferably, the transparent ink composition contains a silicone-based surfactant.

[0108] The surfactant content is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.2% by mass or more, and particularly preferably 0.3% by mass or more, based on the total amount of the transparent ink composition. When the surfactant content is within the above range, the permeability of the transparent ink composition to the fabric can be suitably adjusted. Furthermore, the surfactant content is preferably 3% by mass or less, more preferably 2% by mass or less, and even more preferably 1% by mass or less.

[0109] 1.2.3.5. Inorganic Alkalis The transparent ink composition may contain an inorganic alkali. Preferably, at least one of the transparent ink composition and the white ink composition described later contains an inorganic alkali.

[0110] Inorganic alkalis increase and adjust the pH of the transparent ink composition. Furthermore, inorganic alkalis enhance the dispersibility of resin particles. Therefore, even when the transparent ink composition is dispensed from a nozzle adjacent to the reaction solution, good dispensing stability can be achieved.

[0111] Examples of inorganic alkalis include alkali metal hydroxides or alkaline earth metal hydroxides, alkali metal carbonates or alkaline earth metal carbonates, alkali metal phosphates or alkaline earth metal phosphates, and so on.

[0112] Examples of alkali metal hydroxides include lithium hydroxide, sodium hydroxide, and potassium hydroxide. Examples of alkaline earth metal hydroxides include calcium hydroxide and magnesium hydroxide.

[0113] Examples of alkali metal carbonates include lithium carbonate, lithium bicarbonate, potassium carbonate, potassium bicarbonate, sodium carbonate, and sodium bicarbonate. Examples of alkaline earth metal carbonates include calcium carbonate.

[0114] Examples of alkali metal phosphates include lithium phosphate, potassium phosphate, potassium dihydrogen phosphate, trisodium phosphate, and disodium hydrogen phosphate. Examples of alkaline earth metal phosphates include calcium phosphate and calcium hydrogen phosphate.

[0115] Inorganic alkalis may be used individually or in combination of two or more types.

[0116] The inorganic alkali content is preferably 0.02% by mass or more, more preferably 0.03% by mass or more, even more preferably 0.04% by mass or more, and particularly preferably 0.05% by mass or more, relative to the total amount of the transparent ink composition. When the inorganic alkali content is within the above range, the ejection stability of the transparent ink composition tends to be good during printing. Furthermore, the inorganic alkali content is preferably 1.0% by mass or less, more preferably 0.8% by mass or less, and even more preferably 0.5% by mass or less.

[0117] 1.2.3.6. Other ingredients The transparent ink composition may contain other components as needed. The other components shall be in accordance with "1.1.3.5. Other Components".

[0118] Furthermore, the transparent ink composition may contain colorants such as pigments, but it is preferable that the amount is 0.2% by mass or less, more preferably 0.1% by mass or less, even more preferably 0.05% by mass or less, and it is particularly preferable that it does not contain any colorants.

[0119] 1.2.4. Physical Properties From the viewpoint of reducing skin irritation, the pH of the transparent ink composition is preferably 2.0 or higher, more preferably 5.0 or higher, and even more preferably 7.0 or higher.

[0120] The viscosity of the transparent ink composition is preferably 1 mPa·s to 15 mPa·s at 20°C, more preferably 2 mPa·s to 12 mPa·s, and even more preferably 3 mPa·s to 10 mPa·s. When the viscosity of the transparent ink composition is within the above range, the ejection stability during printing tends to be good.

[0121] Furthermore, the viscosity of the equal-volume mixture of the transparent ink composition and the reaction solution is described in section "1.1.4. Physical Properties" and is therefore omitted here.

[0122] The surface tension of the transparent ink composition is preferably 10 to 40 mN / m, more preferably 15 to 35 mN / m, and even more preferably 20 to 30 mN / m at 20°C.

[0123] 1.3. White ink application process The inkjet recording method according to this embodiment includes a white ink application step in which a white ink composition containing a white pigment, resin particles, and water is applied by an inkjet method to an area of ​​the fabric to which a transparent ink composition has been applied.

[0124] 1.3.1. Adhesion Patterns In the inkjet recording method according to this embodiment, the reaction solution application step may be performed again before the white ink application step in order to aggregate the white pigment, resin particles, etc. The above reaction solution application step (hereinafter also referred to as the "re-reaction solution application step") and the white ink application step may be performed on the same area of ​​the fabric with a single scan of the inkjet head. Details of the re-reaction solution application step and the white ink application step are as described in section "1.1.1. Application Method".

[0125] 1.3.2. Amount of adhesion In the inkjet recording method according to this embodiment, the area to which the white ink composition is attached has an attachment amount of 0.230 g / inch 2The following region is present. If the amount of white ink composition applied is too much, bleeding is likely to occur, and if it is too little, the color development deteriorates. Therefore, if the area where the white ink composition is applied is below the above-mentioned range of application amounts, the color development of the printed material will be good and bleeding will be reduced.

[0126] The area where the white ink composition adheres has an adhesion amount of 0.200 g / inch. 2 Preferably, it has the following region: 0.180 g / inch 2 It is more preferable to have the following region: 0.150 g / inch 2 It is even more preferable to have a region that is as follows: 0.120 g / inch 2 It is particularly preferable that the region has the following characteristics. Furthermore, from the viewpoint of improving color development, the adhesion area of ​​the white ink composition should have an adhesion amount of 0.050 g / inch. 2 Preferably, it is 0.060 g / inch 2 It is more preferable that the concentration be greater than or equal to 0.070 g / inch 2 It is even more preferable that the concentration be greater than or equal to 0.080 g / inch 2 It is especially preferable that the above conditions are met.

[0127] 1.3.3. White Ink Composition The white ink composition in the inkjet recording method according to this embodiment contains a white pigment, resin particles, and water. The components contained in the white ink composition are described below.

[0128] 1.3.3.1. White Pigments The white ink composition contains a white pigment. Examples of white pigments include CI Pigment White 1, which is basic lead carbonate; CI Pigment White 4, which is zinc oxide; CI Pigment White 5, which is a mixture of zinc sulfide and barium sulfate; CI Pigment White 6, which is titanium dioxide; CI Pigment White 6:1, which is titanium dioxide containing other metal oxides; CI Pigment White 7, which is zinc sulfide; CI Pigment White 18, which is calcium carbonate; CI Pigment White 19, which is clay; CI Pigment White 20, which is titanium mica; CI Pigment White 21, which is barium sulfate; CI Pigment White 22, which is gypsum; CI Pigment White 26, which is magnesium oxide and silicon dioxide; CI Pigment White 27, which is silicon dioxide; and CI Pigment White 28, which is anhydrous calcium silicate. Among these, it is preferable to use CI Pigment White 6, which has excellent color development and opacity as an image base.

[0129] The average particle size of the white pigment is preferably between 100 nm and 500 nm, more preferably between 150 nm and 450 nm, and even more preferably between 200 nm and 400 nm. Setting the average particle size of the white pigment within this range tends to ensure ejection stability from the inkjet head. It also tends to improve the opacity as a base for printed images. In this specification, "average particle size" refers to the volume-based particle size distribution, which is the particle size at a cumulative distribution of 50 vol% unless otherwise specified. The average particle size is measured using the dynamic light scattering method or the laser diffraction method described in JIS Z8825. Specifically, a particle size analyzer that uses the dynamic light scattering method as its measurement principle (e.g., "Microtrac UPA," manufactured by Nikkiso Co., Ltd.) can be used.

[0130] The content of the white pigment is preferably 1 to 30% by mass, more preferably 2 to 25% by mass, even more preferably 4 to 20% by mass, and particularly preferably 6 to 15% by mass, relative to the total amount of the white ink composition. When the content of the white pigment is within the above range, the printed material exhibits good color development and also good friction fastness.

[0131] White pigments may be dispersed using a pigment dispersant. Alternatively, the pigment surface may be oxidized or sulfonated with ozone, hypochlorous acid, fuming sulfuric acid, etc., to form a self-dispersing pigment which can then be dispersed for use.

[0132] Pigment dispersants have the function of dispersing pigments in ink. Pigment dispersants may be water-soluble, but those that are not completely water-soluble are preferred. It is thought that they disperse pigments by partially or completely binding to or adsorbing to the pigment, thereby increasing the hydrophilicity of the pigment surface.

[0133] Pigment dispersants are polymer compounds, and examples include acrylic resins and their salts such as poly(meth)acrylic acid, (meth)acrylic acid-acrylonitrile copolymer, (meth)acrylic acid-(meth)acrylic acid ester copolymer, vinyl acetate-(meth)acrylic acid ester copolymer, vinyl acetate-(meth)acrylic acid copolymer, vinylnaphthalene-(meth)acrylic acid copolymer, styrene-(meth)acrylic acid copolymer, styrene-(meth)acrylic acid copolymer, styrene-(meth)acrylic acid-(meth)acrylic acid ester copolymer, styrene-α-methylstyrene-(meth)acrylic acid copolymer, and styrene-α-methylstyrene-(meth)acrylic acid-(meth)acrylic acid ester copolymer.

[0134] Furthermore, examples of pigment dispersants include maleic acid-based resins and their salts, such as styrene-maleic acid copolymer, styrene-maleic anhydride copolymer, vinylnaphthalene-maleic acid copolymer, and vinyl acetate-maleic acid ester copolymer; urethane-based resins and their salts, with or without crosslinking structures; polyvinyl alcohols; and resins such as vinyl acetate-crotonic acid copolymer and its salts.

[0135] Furthermore, acrylic resins may be copolymers of acrylic monomers (acrylic monomers) as described above, or copolymers of acrylic monomers with other monomers. For example, acrylic vinyl resin, which is a copolymer of vinyl monomers as the other monomer, is also called an acrylic resin. Also, among the styrene resins mentioned above, those which are copolymers of styrene monomers and acrylic monomers are included in acrylic resins. Moreover, when referring to acrylic resins, their salts and esterified products are also included.

[0136] Examples of commercially available pigment dispersants include X-200, X-1, X-205, X-220, X-228 (manufactured by Seikoh PMC), Nopcospers® 6100, 6110 (manufactured by Sunnopco Corporation), Joncryl 67, 586, 611, 678, 680, 682, 819 (manufactured by BASF), DISPERBYK-190 (manufactured by Bic Chemie Japan Co., Ltd.), N-EA137, N-EA157, N-EA167, N-EA177, N-EA197D, N-EA207D, and E-EN10 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.).

[0137] Examples of commercially available acrylic pigment dispersants include BYK-187, BYK-190, BYK-191, BYK-194N, BYK-199 (manufactured by Bic Chemie Japan Co., Ltd.), Aron A-210, A6114, AS-1100, AS-1800, A-30SL, A-7250, and CL-2 (manufactured by Toagosei Co., Ltd.).

[0138] Commercially available urethane-based pigment dispersants include BYK-182, BYK-183, BYK-184, BYK-185 (manufactured by Bic Chemi Japan Co., Ltd.), TEGO Disperse710 (manufactured by Evonic Tego Chemi), and Borchi® Gen1350 (manufactured by OMG Borschers).

[0139] The pigment dispersant is preferably an anionic pigment dispersant. An "anionic pigment dispersant" refers to a pigment dispersant that has a negative charge as a whole, and it is preferable that it has one or more anionic groups selected from carboxyl groups, sulfonic acid groups, phosphate groups, etc.

[0140] It is preferable that at least one of the white pigment and the resin particles described later in the white ink composition is anionic. In this case, better color development and better friction fastness tend to be obtained due to superior flocculation by the flocculant.

[0141] A pigment is anionic if it has a negative charge as a whole, and it is preferable that it has one or more anionic groups selected from carboxyl groups, sulfonic acid groups, phosphate groups, etc. The anionic groups may be directly present on the pigment surface, or they may be present via an anionic resin dispersant adsorbed or bound to the pigment.

[0142] The pigment dispersant may be used alone or in combination of two or more types. The total content of the pigment dispersant is preferably 0.1% to 30% by mass, more preferably 0.5% to 25% by mass, even more preferably 1% to 20% by mass, and particularly preferably 1.5% to 15% by mass, based on the total amount of the white ink composition. By having a pigment dispersant content of 0.1% by mass or more, the dispersion stability of the pigment can be ensured. Furthermore, if the pigment dispersant content is 30% by mass or less, the viscosity of the white ink composition can be reduced.

[0143] Furthermore, it is even more preferable that the weight-average molecular weight of the pigment dispersant be 500 or higher. Using such a pigment dispersant tends to result in less odor and improved dispersion stability of the pigment.

[0144] When dispersing a white pigment with a pigment dispersant, the ratio of pigment to pigment dispersant is preferably 10:1 to 1:10, and more preferably 4:1 to 1:3.

[0145] 1.3.3.2. Resin particles The white ink composition contains resin particles. Examples of resin particles include urethane resin, acrylic resin (including styrene-acrylic resin), fluorene resin, olefin resin, rosin-modified resin, terpene resin, ester resin, amide resin, epoxy resin, vinyl chloride resin, vinyl chloride-vinyl acetate copolymer, and ethylene vinyl acetate resin. Among these, urethane resin, acrylic resin, olefin resin, and ester resin are preferred. The resin particles may be used individually or in combination of two or more types.

[0146] The resin particles in the white ink composition are preferably anionic. In this case, the flocculation action by the flocculant is superior, resulting in good color development and good friction fastness of the printed material. The anionic resin particles are as specified in section 1.2.3.1. Anionic Resin Particles.

[0147] The resin particles are preferably made of urethane resin or acrylic resin, and more preferably urethane resin. If the resin particles are made of urethane resin, the frictional fastness will be better.

[0148] The glass transition temperature (Tg) of the resin particles is preferably between -60°C and 50°C, more preferably between -60°C and 40°C, and even more preferably between -30°C and 10°C. When the glass transition temperature (Tg) of the resin particles is within the above range, the texture of the printed material tends to be superior.

[0149] The resin particle content (solid content concentration) is preferably 1 to 30% by mass, more preferably 2 to 25% by mass, even more preferably 4 to 20% by mass, particularly preferably 6 to 15% by mass, and most preferably 8 to 12% by mass, relative to the total amount of the white ink composition. When the resin particle content is within the above range, better color development and friction fastness can be obtained.

[0150] 1.3.3.3.Water The white ink composition contains water. The water is as specified in section 1.1.3.2. Water.

[0151] The water content is preferably 20% by mass or more, more preferably 30% by mass or more, even more preferably 40% by mass or more, and particularly preferably 50% by mass or more, relative to the total amount of the white ink composition. There is no particular upper limit to the water content, but for example, it is preferably 90% by mass or less, and more preferably 70% by mass or less, relative to the total amount of the white ink composition.

[0152] 1.3.3.4. Organic Solvents The white ink composition may contain an organic solvent. The organic solvent shall conform to the provisions of section "1.1.3.3. Organic Solvents".

[0153] The organic solvent in the white ink composition preferably contains alkanediols, alkylene glycol ethers, and trialkylene glycol; more preferably contains 1,2-alkanediols, alkylene glycol ethers, and trialkylene glycol; and even more preferably contains propylene glycol, triethylene glycol monobutyl ether, and triethylene glycol. When the organic solvent contains these solvents, the color development and friction fastness may be superior.

[0154] The content of the organic solvent is preferably 5 to 50% by mass, more preferably 10 to 40% by mass, even more preferably 15 to 30% by mass, and particularly preferably 20 to 25% by mass, relative to the total amount of the white ink composition. When the content of the organic solvent is within the above range, the color development of the printed material tends to be good.

[0155] 1.3.3.5. Surfactants The white ink composition may contain a surfactant. The type of surfactant, etc., is as specified in section 1.1.3.4. Surfactants. The white ink composition preferably contains a silicone-based surfactant.

[0156] The surfactant content is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.2% by mass or more, and particularly preferably 0.3% by mass or more, relative to the total amount of the white ink composition. When the surfactant content is within the above range, the permeability of the white ink composition to the fabric can be suitably adjusted. Furthermore, the surfactant content is preferably 3% by mass or less, more preferably 2% by mass or less, even more preferably 1% by mass or less, and particularly preferably 0.5% by mass or less.

[0157] 1.3.3.6. Inorganic Alkali The white ink composition may contain an inorganic alkali. It is preferable that at least one of the transparent ink composition and the white ink composition contains an inorganic alkali. The inorganic alkali is as specified in section 1.2.3.5. Inorganic Alkali.

[0158] The inorganic alkali content is preferably 0.02% by mass or more, more preferably 0.03% by mass or more, even more preferably 0.04% by mass or more, and particularly preferably 0.05% by mass or more, relative to the total amount of the white ink composition. When the inorganic alkali content is within the above range, the ejection stability of the white ink composition tends to be good during printing. Furthermore, the inorganic alkali content is preferably 1.0% by mass or less, more preferably 0.8% by mass or less, and even more preferably 0.5% by mass or less.

[0159] 1.3.3.7. Other Ingredients The white ink composition may contain other components as needed. The other components are as specified in "1.1.3.5. Other Components".

[0160] 1.3.4. Physical Properties The viscosity of the white ink composition is preferably 1.0 mPa·s to 10 mPa·s at 20°C, more preferably 2.0 mPa·s to 10 mPa·s, even more preferably 3.0 mPa·s to 8.0 mPa·s, and particularly preferably 4.0 mPa·s to 6.0 mPa·s. In particular, a viscosity of 4.0 mPa·s or higher tends to yield better color development. A viscosity of 6.0 mPa·s or lower tends to yield better discharge stability.

[0161] The surface tension of the white ink composition is preferably 10 to 40 mN / m at 20°C, more preferably 15 to 35 mN / m, even more preferably 20 to 30 mN / m, and particularly preferably 20 to 27 mN / m.

[0162] 1.4.Heat drying process The inkjet recording method according to this embodiment may include a step of heating and drying the ink or the like that has adhered to the fabric after the white ink application step (heat drying step).

[0163] The heating and drying method is not particularly limited, but examples include a belt conveyor oven, atmospheric pressure steam method, high-pressure steam method, and thermofix method. The heat source for heating and drying is not particularly limited, but examples include infrared lamps.

[0164] The heating and drying temperature is preferably such that the resin particles contained in the ink are fused together and the medium such as moisture evaporates. The heating and drying temperature is preferably, for example, 100°C to 250°C, more preferably 120°C to 230°C, even more preferably 140°C to 200°C, and particularly preferably 150°C to 180°C. Here, the heating and drying temperature in the heating and drying process refers to the surface temperature of the image or the like formed on the fabric. The time for heating and drying is not particularly limited, but for example, it is preferably 30 seconds to 20 minutes, and more preferably 2 minutes to 5 minutes.

[0165] 1.5. Other processes The inkjet recording method according to this embodiment may include steps such as washing the recorded fabric with water and heating and drying it again. During the washing, if necessary, a soaping treatment may be performed to wash away any ink or other components that were not fixed to the fabric using a hot soap solution or the like.

[0166] 1.6.Fabric Examples of fabrics used in the inkjet recording method according to this embodiment include cloth, clothing, and other fashion accessories. Cloths include woven fabrics, knitted fabrics, and nonwoven fabrics. Clothing and other fashion accessories include sewn T-shirts, handkerchiefs, scarves, towels, tote bags, cloth bags, curtains, sheets, bedspreads, wallpaper and other furniture, as well as fabrics before and after cutting as parts before sewing. These forms include long rolls, cut to a predetermined size, and product shapes.

[0167] Examples of materials that make up the fabric include natural fibers such as cotton, linen, wool, and silk; synthetic fibers such as polypropylene, polyester, acetate, triacetate, polyamide, and polyurethane; and biodegradable fibers such as polylactic acid. Blends of these fibers are also acceptable. Among these materials, cotton, polyester, or blends of cotton and polyester are readily available and therefore preferable.

[0168] 2. Inkjet recording device An inkjet recording apparatus used in the inkjet recording method according to this embodiment will be described.

[0169] As an example of an inkjet recording device, Figure 1 shows a perspective view of a serial printer. As shown in Figure 1, the serial printer 20 comprises a transport unit 220 and a recording unit 230. The transport unit 220 transports the recording medium F supplied to the serial printer to the recording unit 230 and discharges the recorded recording medium outside the serial printer after recording. Specifically, the transport unit 220 has feed rollers and transports the fed recording medium F in the transport direction TD.

[0170] Furthermore, the recording unit 230 includes a carriage 234 on which an inkjet head 231 is mounted, having a nozzle for ejecting a reaction solution onto the recording medium F sent from the transport unit 220, a nozzle for ejecting a transparent ink composition, and a nozzle for ejecting a white ink composition, and a carriage movement mechanism 235 for moving the carriage 234 in the scanning direction SD of the recording medium F.

[0171] Figure 2 shows an example of the nozzle rows on the nozzle surface of the inkjet head 231. In Figure 2, the inkjet head 231 has multiple nozzle rows, numbered A to H, along the scanning direction SD, each consisting of multiple nozzles arranged along the direction (transport direction TD) that intersects the direction in which the inkjet head 231 moves (scanning direction SD).

[0172] In this case, when the nozzle row that ejects the reaction solution is projected along the scanning direction SD, by arranging it so that at least a portion of it overlaps with the nozzle row that ejects the transparent ink composition in the transport direction TD, step 1 (the step of applying the reaction solution and the transparent ink composition to the same area on the fabric with a single scan of the inkjet head) can be performed. Similarly, when the nozzle row that ejects the reaction solution is projected along the scanning direction SD, by arranging it so that at least a portion of it overlaps with the nozzle row that ejects the white ink composition in the transport direction TD, the reaction solution and the white ink composition can be applied to the same area on the fabric with a single scan of the inkjet head, similar to step 1 described above.

[0173] The inks to be dispensed from each nozzle row can be selected as appropriate, but for example, rows A to B may be selected to dispense the reaction solution, rows C to F to dispense the white ink composition, and rows G to H to dispense the transparent ink composition.

[0174] In a serial printer, the inkjet head 231 has a length smaller than the width of the recording medium, and recording is performed as the head moves in a scanning direction SD that intersects the transport direction TD of the recording medium F. In a serial printer, the head 231 is mounted on a carriage 234 that moves in a predetermined direction, and the ink composition and reaction liquid are ejected onto the recording medium as the head moves along with the movement of the carriage. The recording medium may be transported between scans.

[0175] Furthermore, the inkjet recording device is not limited to the serial printer described above, but may also be a line printer. Figure 3 shows a schematic side view of a line printer as another example of an inkjet recording device. As shown in Figure 3, the line printer 1 comprises a feeding unit 100, a transport mechanism 200 for transporting the recording medium in the transport direction, a line head 300 for ejecting and adhering ink to the recording medium, a control unit 500, and an ejection unit 700.

[0176] The transport mechanism is a mechanism for transporting the recording medium in the transport direction. In Figure 3, a roll-shaped recording medium F is supplied from the feeding unit 100 to the transport mechanism 200, and the transport mechanism 200 is configured to transport the recording medium F sent from the feeding unit 100 to the line head 300. Specifically, the transport mechanism 200 has a first feed roller 201 and a second feed roller 202, and is configured to transport the transported recording medium F to the line head 300 on the downstream side in the transport direction. As for the transport method of the transport mechanism 200, conventionally known methods can be used as appropriate, and one or more rollers, or a belt transported by rollers may be used.

[0177] The line printer 1 has a line head 300 having a length corresponding to the width of the recording medium F. The line head 300 may be composed of multiple line jets, and in Figure 3, the line head 300 is composed of a first line head 310, a second line head 320, a third line head 330, and a fourth line head 340. When it is not necessary to distinguish between the first line head 310, the second line head 320, the third line head 330, and the fourth line head 340, it is simply referred to as the line head 300.

[0178] The line head 300 has cavities for containing the reaction liquid, transparent ink composition, and white ink composition (ink, etc.), an ejection drive unit provided for each cavity, and a nozzle for ejecting the ink, etc. Multiple cavities, and the ejection drive units and nozzles provided for each cavity, may be provided on a single head, independently of each other. The ejection drive unit can be formed using an electromechanical conversion element such as a piezoelectric element that changes the volume of the cavity by mechanical deformation, or an electrothermal conversion element that generates bubbles in the ink by generating heat and ejecting it.

[0179] The line head 300 is preferably configured such that the reaction solution is discharged from the first line head 310 and the transparent ink composition is discharged from the second line head 320. This allows the above-described step 1 to be carried out smoothly. Alternatively, it is preferable that the reaction solution is discharged from the third line head 330 and the white ink composition is discharged from the fourth line head 340. This makes it easier to carry out the reaction solution application step and the transparent ink application step simultaneously.

[0180] In line printers, the print head is fixed (almost) without moving, and recording is performed in a single scan of the inkjet head. Line printers have an advantage over serial printers in that they have a faster recording speed.

[0181] 3. Examples The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, "%" is based on mass.

[0182] 3.1. Preparation of reaction solution, transparent ink composition and white ink composition Each component was placed in a container to obtain the composition shown in Table 1 (Figure 4), mixed and stirred, and then filtered through a 5 μm membrane filter to obtain the reaction solutions (reaction solution 1, 2), transparent ink compositions (transparent ink 1, 2), and white ink compositions (Wh ink 1, 2) for each example. Unless otherwise specified, the numerical values ​​of the components shown in each example in the table represent mass percent. In addition, the mass percent of the colorant and resin particles in the table represent the solid content concentration.

[0183] As a white pigment, a pigment dispersion prepared in advance by the following procedure was used. CI Pigment White 6 (specific gravity: 4.2 g / mL), which is titanium dioxide, was used as the pigment, and an anionic resin dispersant was used as the pigment dispersant. Specifically, a styrene-acrylic resin synthesized using 55% by mass of styrene, 20% by mass of acrylic acid, and 30% by mass of methyl methacrylate was used. Three parts by mass of pigment were mixed with one part by mass of dispersant and ten parts by mass of ion-exchanged water. The resulting mixture was premixed, and then dispersed using a bead mill disperser (Kotobuki Kogyo Co., Ltd., UAM-015) with zirconia beads with a diameter of 0.03 mm at a peripheral speed of 10 m / s and a liquid temperature of 30°C for 15 minutes. Coarse particles were then centrifuged using a centrifuge (Kuboyama Shoji Co., Ltd., Model-3600) to obtain a titanium dioxide dispersion.

[0184] The abbreviations and other product names shown in Table 1 are explained below.

[0185] • Takerack WS-6021S (Product name "Takerack (registered trademark) WS-6021S", manufactured by Mitsui Chemicals Polyurethane Co., Ltd., urethane resin) • BYK-348 (product name, manufactured by Big Chemie Japan Co., Ltd., silicone-based surfactant) • Orphine E1010 (product name "Orphine (registered trademark) E1010", manufactured by Nisshin Chemical Industry Co., Ltd., acetylene-based surfactant) The viscosity of the equal volume mixture was measured using a rheometer MCR-302e (product name, manufactured by Anton Paar). In the measuring section, which consists of a disc-shaped non-rotating plate and a disc-shaped rotating plate, equal volumes of the reaction solution and transparent ink were dropped onto the non-rotating plate, and the viscosity was measured at a shear rate of 50 [s]. -1 The rotating plate was rotated using [a specific method]. The viscosity of the liquid after 3 minutes from the start of rotation was defined as the viscosity of the equal-volume mixture. The viscosity measurement was performed at an ambient temperature of 20°C.

[0186] Surface tension was measured using an automatic surface tension meter CBVP-Z (product name, manufactured by Kyowa Interface Science Co., Ltd.) by checking the surface tension when a platinum plate was wetted with a reaction solution or ink composition at a temperature of 25°C.

[0187] 3.2. Recording Conditions Using the reaction solution, transparent ink, and Wh ink prepared in Section 3.1, records were made for each example and each comparative example based on the conditions described below and the conditions listed in Tables 2 to 4.

[0188] <Recording device and settings> The recording was performed using a modified SC-F2250 (manufactured by Seiko Epson Corporation, serial type). The recording was performed with the following settings. Image resolution (reaction solution, transparent ink, Wh ink): 1200 x 1200 dpi Image resolution (black ink): 600 x 600 dpi • Duty Shift (reactive solution applied simultaneously with transparent ink): 0-900% • Duty cycle (reaction solution applied simultaneously with Wh ink): 60-210% • Ink Duty (Transparent Ink): 0-300% • Ink Duty Cycle (Wh Ink): 60-210% Carriage speed: 12.8 inches / s The head nozzle configuration of the recording device is as shown in Figure 2, with rows A to B being nozzles that dispense the reaction solution, rows C to F being nozzles that dispense Wh ink, and rows G to H being nozzles that dispense transparent ink.

[0189] In the table, "adhesion time difference" refers to the time difference between the adhesion of the reaction solution and the transparent ink composition within the same area of ​​the fabric.

[0190] <Recording medium> The recording medium was a woven fabric, specifically a 100% cotton black T-shirt (Printstar).

[0191] <Drying> The printed materials were dried at 160°C for 6 minutes using a conveyor drying oven, ECONOMAX D (manufactured by M&R, product name).

[0192] 3.3. Evaluation Method 3.3.1. Color development Based on the above recording conditions, the reaction solution and transparent ink, and the reaction solution and Wh ink were applied to the fabric, and heated and dried in a conveyor drying oven at 160°C for 6 minutes to obtain printed materials according to each example and comparative example. The color development of the obtained printed materials was evaluated. Specifically, for each example's printed material, a fluorescence spectrophotometer FD-7 (manufactured by Konica Minolta, Inc.) was used to evaluate the color development. * The values ​​were measured, and the whiteness was measured. (Evaluation Criteria) A:L * 85 or higher. B:L * Over 80. C:L * Less than 80.

[0193] 3.3.2. Friction resistance Based on the recording conditions described above, the reaction solution and transparent ink, and the reaction solution and Wh ink were applied to the fabric, and then black ink (Bk ink) for the SC-F2250 was used to print solid black in the dual-color mode of the SC-F2250. After printing the black ink, the fabric was heated and dried in a conveyor drying oven at 160°C for 6 minutes to obtain printed materials for each example and comparative example. The printed materials were left to stand, and after the temperature of the printed materials reached 25°C, a drying test was performed in accordance with JIS L 0849 Type II to determine the friction fastness.

[0194] The duty cycle for black ink was set to 100%, and the head nozzle configuration for black printing was as follows: rows A and B dispensed white ink, row C dispensed cyan ink, row D dispensed magenta ink, row E dispensed yellow ink, row F dispensed black ink, and rows G through H dispensed white ink. (Evaluation Criteria) A: Dry friction grade 3 or higher. B: Dry friction grade 2 or higher. C: Dry friction rating below 2.

[0195] 3.3.3. Texture Based on the recording conditions described above, the reaction solution and transparent ink, and the reaction solution and Wh ink were applied to a fabric to obtain printed materials corresponding to each example and comparative example. The ink-applied portion of the obtained printed material was cut out to a size of 20 cm x 20 cm to prepare a test specimen. Using a tensile shear testing machine KE-S-FB1-A (manufactured by Kato Tech Co., Ltd.), the tension-curvature curve of the test specimen was measured under the conditions of a shear tension of 10 gf / cm and a shear shear angle of ±8°. The shear hardness [gf / (cm·deg)] was obtained by waveform regression between curvatures of 0.5° and 2.5° in the measured tension-curvature curve.

[0196] Furthermore, the shear hardness of a fabric (Printstar00085-CVT) without the reaction solution, transparent ink, or Wh ink was obtained in the same manner as the printed material described above. The difference between the shear hardness of the printed material and the shear hardness of the fabric alone was calculated, and the texture was evaluated. (Evaluation Criteria) A: The absolute value of the difference in shear hardness is less than 3.5. B: The absolute value of the difference in shear hardness is between 3.5 and 5.0. C: The absolute value of the difference in shear hardness is greater than 5.0.

[0197] 3.3.4. Smudging Based on the recording conditions described above, the reaction solution and transparent ink were applied to the fabric. The reaction solution and Wh ink were then applied to the area where the reaction solution and transparent ink had been applied, covering an area of ​​12 inches x 12 inches. The fabric was then heated and dried in a conveyor drying oven at 160°C for 6 minutes to obtain printed materials for each example and comparative example. The obtained printed materials were left to stand until the temperature reached 25°C, and the length over which the Wh ink bled beyond the printed area was measured to evaluate the bleeding. (Evaluation Criteria) A: There is no bleeding or smudging. B: The bleeding / smudge is less than 2mm. C: The bleeding / overprint is 2mm or more.

[0198] 3.3.5. Cracks in the paint film Based on the above recording conditions, the reaction solution and transparent ink, and the reaction solution and Wh ink were applied to the fabric, and heated and dried in a conveyor drying oven at 160°C for 6 minutes to obtain printed materials according to each example and comparative example. The obtained printed materials were left to stand until the temperature reached 25°C, and then the presence or absence of cracks in the printed image was visually checked. If cracks occurred, the areas with and without cracks were examined using a fluorescence spectrometer FD-7 (manufactured by Konica Minolta, Inc.). * The values ​​were measured, the presence or absence of an impact on color development was checked, and paint film cracking was evaluated. (Evaluation Criteria) A: No image cracks occurred. B: Cracks have occurred in the image. L is the difference between the area where the cracks occurred and the area where they did not. * The difference in values ​​is within 2. C: Image cracks are present. L is the area where the cracks occurred and the area where they did not. * The difference in values ​​exceeds 2.

[0199] 3.3.6.Discharge stability Using the recording device described above, a nozzle check pattern was printed on a transparent PET film. After confirming that the nozzle check image was printed correctly and that ink was being ejected normally from all nozzles, the automatic head cleaning function was turned off. Using Wh ink, ten A4-sized solid images were printed consecutively, and then the nozzle check pattern was printed again on the transparent PET film. The number of nozzles that could not eject the ink composition was counted from the nozzle check pattern, and if any nozzles that could not eject ink were found, a recovery operation was performed once using the printer's internal head cleaning function.

[0200] After repeatedly printing solid color images and checking the nozzle check pattern until 50 solid color images were produced, the number of nozzles that could not eject the ink composition generated in one go (number of nozzle failures) was counted according to the nozzle check pattern, and the ejection stability was evaluated. (Evaluation Criteria) A: No nozzle detachment. B: Fewer than 2 nozzles have come loose. C: Fewer than 5 nozzles have come loose. D: The number of nozzles that have come loose is 5 or more.

[0201] 3.4. Evaluation Results The process includes: a reaction solution application step in which a reaction solution containing a flocculant and water is applied to a fabric by an inkjet method; a transparent ink application step in which a transparent ink composition containing anionic resin particles and water is applied to the fabric by an inkjet method; and a white ink application step in which a white ink composition containing a white pigment, resin particles and water is applied to the area of ​​the fabric to which the transparent ink composition has been applied by an inkjet method, wherein the application area of ​​the transparent ink composition has an application amount of 0.029 g / inch 2 The region has an area of ​​the above, and the area where the white ink composition adheres has an adhesion amount of 0.230 g / inch. 2 Each embodiment of the inkjet recording method having the following region showed good results in the evaluation items of color development, friction fastness, and bleeding.

[0202] In contrast, all of the comparative examples that did not meet the above conditions failed to obtain good results in any of the evaluation items for color development, friction fastness, or bleeding.

[0203] In a comparison between Example 1 and Comparative Examples 1-3, the inkjet recording method, when it includes a transparent ink application step, forms a resin layer, and the printed material exhibits good friction fastness.

[0204] In a comparison between Example 3 and Comparative Example 4, the adhesion amount of the transparent ink composition was 0.029 g / inch. 2 Having the above-mentioned region resulted in the printed material exhibiting good friction fastness.

[0205] In a comparison between Example 1 and Comparative Example 5, the amount of white ink composition applied was 0.230 g / inch. 2 Having the following areas reduced bleeding in the printed material and resulted in a good texture.

[0206] From Example 2, it was found that when the sum of the amount of reaction solution and the amount of transparent ink composition applied was above a predetermined value, the printed material tended to exhibit good color development, reduced bleeding, and good friction fastness.

[0207] Examples 1, 4, and 5 showed that when the amount of white ink composition applied was within a predetermined range, the printed material tended to exhibit good color development.

[0208] Examples 6 to 10 showed that when the ratio of the amount of transparent ink composition to the amount of white ink composition was within a predetermined range, the bleeding of the printed material tended to be reduced.

[0209] Examples 11 and 12 showed that when the amount of acidic groups of the organic acid flocculant attached was above a predetermined value, the resin layer was formed well, the bleeding of the printed material was reduced, and the color development tended to be good.

[0210] Examples 1 and 13 show that including an inorganic alkali in at least one of the transparent ink composition and the white ink composition improved the ink ejection stability by the inkjet recording device.

[0211] Examples 1 and 14 showed that when the flocculant was an organic acid, particularly lactic acid, the printed material tended to exhibit good color development. Furthermore, when the viscosity of the reaction solution and the transparent ink composition were within a predetermined range, and the viscosity of the equal mixture was above a predetermined value, a resin layer was more easily formed, and the printed material tended to exhibit good color development.

[0212] The present invention is not limited to the embodiments described above, and various modifications are possible. For example, the present invention includes configurations that are substantially identical to the configurations described in the embodiments, for example, configurations that have the same function, method and result, or configurations that have the same purpose and effect. The present invention also includes configurations in which non-essential parts of the configurations described in the embodiments are replaced. Furthermore, the present invention includes configurations that produce the same effects or achieve the same purpose as the configurations described in the embodiments. Furthermore, the present invention includes configurations that add known technology to the configurations described in the embodiments.

[0213] From the embodiments described above, the following can be derived.

[0214] The inkjet recording method includes a reaction solution application step in which a reaction solution containing a coagulant and water is applied to a fabric by an inkjet method, A transparent ink application step in which a transparent ink composition containing anionic resin particles and water is applied to the fabric by an inkjet method, A white ink application step involves applying a white ink composition containing a white pigment, resin particles, and water to an area of ​​the fabric to which the transparent ink composition has been applied, using an inkjet method. It has, The area where the transparent ink composition is applied has an application amount of 0.029 g / inch 2 Having a region that is greater than or equal to The area where the white ink composition is applied is such that the amount of the white ink composition applied is 0.230 g / inch. 2 It has the following region:

[0215] According to this inkjet recording method, a transparent ink composition is applied to the fabric to which the reaction solution has adhered, forming a resin layer near the surface of the fabric, which reduces bleeding and show-through of the white ink composition that is further applied. In addition, the bonding between the resin layer and the white ink composition results in printed materials exhibiting good color development and good friction fastness. Furthermore, the area to which the transparent ink composition is applied is 0.029 g / inch 2 By having the above-mentioned region, even if a portion of the transparent ink composition penetrates the fabric, the amount necessary to form the resin layer remains near the surface of the fabric. As a result, a resin layer is formed, and bleeding and show-through of the white ink composition are reduced. Furthermore, the area where the white ink composition adheres is such that the amount of white ink composition adhered is 0.230 g / inch. 2 Having the following regions results in printed materials exhibiting good color reproduction and improved friction fastness.

[0216] In the inkjet recording method described above, the viscosity of the reaction solution and the transparent ink composition may be 3 mPa·s or more and 10 mPa·s or less at 20°C, and the viscosity of an equal mixture of the reaction solution and the transparent ink composition may be 50 mPa·s or more at 20°C.

[0217] This inkjet recording method allows the reaction solution and transparent ink composition to remain near the surface of the fabric, resulting in the favorable formation of a resin layer. Consequently, bleeding of the printed material is reduced, and color development is improved.

[0218] In the inkjet recording method described above, the sum of the amount of reaction solution and the amount of transparent ink composition is 0.27 g / inch 2 That's fine too.

[0219] This inkjet recording method ensures that the resin layer is formed appropriately, reducing bleeding of the printed material and resulting in better color reproduction.

[0220] In the inkjet recording method described above, the coagulant is an organic acid, and the amount of attachment of the acidic group of the organic acid is 9.7 × 10 -7 mol / inch 2 That's fine too.

[0221] This inkjet recording method uses an organic acid as the coagulant, which allows the resin particles to aggregate more effectively on the surface of the fabric. As a result, the resulting resin layer is of sufficient thickness, leading to better color development in the printed material.

[0222] In the inkjet recording method described above, the organic acid may be lactic acid.

[0223] This inkjet recording method enhances the aggregation effect, allowing even a small amount of reaction solution to aggregate resin particles in the transparent ink and form a resin layer. As a result, bleeding and show-through of the white ink composition are reduced, and the printed material exhibits good color reproduction.

[0224] In the inkjet recording method described above, the difference in adhesion time between the reaction solution and the transparent ink composition in the same area may be 30 seconds or less.

[0225] According to this inkjet recording method, the transparent ink composition is applied before the adhering reaction solution penetrates the fabric, resulting in the formation of a good resin layer. Therefore, bleeding and show-through of the adhering ink composition are reduced, and the printed material exhibits good color reproduction.

[0226] In the inkjet recording method described above, the reaction solution application step and the transparent ink application step may include the following step 1: Step 1: A step of applying the reaction solution and the transparent ink composition to the same area on the fabric with a single scan of the inkjet head.

[0227] According to this inkjet recording method, the transparent ink composition is applied before the adhering reaction solution penetrates the fabric, resulting in the formation of a good resin layer. Therefore, bleeding and show-through of the adhering ink composition are reduced, and the printed material exhibits good color reproduction.

[0228] In the inkjet recording method described above, at least one of the transparent ink composition and the white ink composition may contain 0.02% by mass or more of an inorganic alkali.

[0229] This inkjet recording method can improve the ejection stability of the ink composition.

[0230] In the inkjet recording method described above, the ratio of the amount of reaction solution to the amount of transparent ink composition to be 1:10 to 10:1 may be used.

[0231] This inkjet recording method ensures that the resin layer is formed appropriately, reducing bleeding of the printed material and resulting in better color reproduction. [Explanation of symbols]

[0232] 20...Serial printer, 220...Transport unit, 230...Recording unit, 231...Inkjet head, 234...Carriage, 235...Carriage movement mechanism, 1...Line printer, 100...Feeding unit, 200...Transport mechanism, 201...First feed roller, 202...Second feed roller, 300...Line head, 310...First line head, 320...Second line head, 330...Third line head, 340...Fourth line head, 500...Control unit, Y...Feeding direction, F...Recording medium, SD...Scanning direction, TD...Transport direction

Claims

1. A reaction solution application step in which a reaction solution containing a coagulant and water is applied to a fabric by an inkjet method, A transparent ink application step in which a transparent ink composition containing anionic resin particles and water is applied to the fabric by an inkjet method, A white ink application step involves applying a white ink composition containing a white pigment, resin particles, and water to an area of ​​the fabric to which the transparent ink composition has been applied, using an inkjet method. It has, The area where the transparent ink composition is applied has an application amount of 0.029 g / inch of the transparent ink composition. ２ Having a region that is greater than or equal to The area where the white ink composition is applied has an application amount of 0.230 g / inch of the white ink composition. ２ An inkjet recording method having the following region.

2. The viscosity of the reaction solution and the transparent ink composition is 3 mPa·s or more and 10 mPa·s or less at 20°C. The inkjet recording method according to claim 1, wherein the viscosity of an equal mixture of the reaction solution and the transparent ink composition is 50 mPa·s or more at 20°C.

3. The sum of the amount of the reaction solution and the amount of the transparent ink composition is 0.27 g / inch. ２ The inkjet recording method according to claim 1 or 2.

4. The flocculant is an organic acid, and the amount of acidic groups attached to the organic acid is 9.7 × 10 －７ mol / inch ２ The inkjet recording method according to claim 1 or 2.

5. The inkjet recording method according to claim 4, wherein the organic acid is lactic acid.

6. The inkjet recording method according to claim 1 or 2, wherein the difference in adhesion time between the reaction solution and the transparent ink composition in the same area is 30 seconds or less.

7. The inkjet recording method according to claim 1 or 2, wherein the reaction solution application step and the transparent ink application step have the following step 1. Step 1: A step of applying the reaction solution and the transparent ink composition to the same area of ​​the fabric with a single scan of the inkjet head.

8. The inkjet recording method according to claim 1 or 2, wherein at least one of the transparent ink composition and the white ink composition contains 0.02% by mass or more of inorganic alkali.

9. The inkjet recording method according to claim 1 or 2, wherein the ratio of the amount of reaction solution attached to the amount of transparent ink composition attached is 1:10 to 10:1.

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