Method for producing printed fabric, inkjet printing apparatus, and ink

Abstract

To provide a method for producing printed fabric, an inkjet printing apparatus, and an ink that can improve discharge stability while preserving fabric texture.SOLUTION: A method for producing printed fabric using an inkjet printing apparatus including an inkjet head that ejects ink droplets from nozzles, an ink tank that stores the ink, and a circulation flow path that connects the ink tank and the inkjet head to circulate the ink, includes a step of ejecting the ink from the inkjet head to apply the ink to a recording medium, wherein the ink contains water, a water-soluble organic solvent, a first resin, and a second resin, the first resin being a water-dispersible resin having a Tg of -30°C or less, the second resin being a silicone acrylic resin having a Tg of 80°C or more and a weight-average molecular weight of 10000 to 100000.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for producing a printed fabric, an ink-jet printing apparatus, and an ink. [Background technology]

[0002] BACKGROUND ART In recent years, inkjet printing, which involves printing onto fabrics by an inkjet system, has been widely used as a method for forming images such as letters, pictures, and designs on fabrics such as woven fabrics and nonwoven fabrics, and for protecting the surface of these images, controlling the glossiness of these images, and increasing the resolution of images, because it enables printing in a short time and improves production efficiency.

[0003] Dye inks have been the mainstream inks used in inkjet printing. However, in the manufacturing method of printed fabrics using dye inks, post-processing such as a washing step for washing away dye that has not dissolved or reacted may be required. Therefore, the use of pigment inks, which can omit this post-processing, has been considered. To improve pigment fixation and image fastness, methods have been known in which a resin is incorporated into the pigment ink or into the pretreatment ink or overcoat ink. Known resins used in such inks include water-dispersible resins and water-soluble resins. Among these, inks using water-insoluble water-dispersible resins (dispersible inks) have been considered from the perspective of improving fastness in humid environments.

[0004] However, when such dispersible ink is used, if the ink is left filled in the flow path, the dispersed components in the ink will settle, causing clogging in the flow path and uneven concentration of the ink. To prevent such clogging, an ink circulation flow path is sometimes provided between the inkjet head and the ink tank (for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2023-140211 [Patent Document 2] Japanese Patent Application Publication No. 2023-53764 Summary of the Invention [Problem to be solved by the invention]

[0006] In an inkjet printing apparatus having such a circulation flow path, a filter may be installed to collect air bubbles and foreign matter contained in the ink. The filter is usually installed in the inkjet head or in the flow path through which the ink flows.

[0007] However, according to the findings of the present inventors, when the inks described in Patent Documents 1 and 2 are used in an inkjet printing apparatus having such a filter, there are problems such as damage to the texture of the fabric, filter clogging, and unstable ejection.

[0008] The present invention has been made in view of the above circumstances, and aims to provide a method for producing a printed fabric, an inkjet printing apparatus, and an ink that can improve ejection stability while maintaining the texture of the fabric. [Means for solving the problem]

[0009] One aspect of the present invention for solving the above problems relates to a method for producing a printed fabric as described in the following items [1] to [5].

[0010] [1] An inkjet head that ejects ink from a nozzle; an ink tank for storing the ink; a circulation flow path that communicates the ink tank with the inkjet head and constitutes a flow path through which the ink circulates; A method for producing a printed fabric using an inkjet printing apparatus having the following features: The method includes a step of ejecting the ink from the inkjet head and applying the ink to a fabric, the ink contains water, a water-soluble organic solvent, a first resin, and a second resin; the first resin is a water-dispersible resin having a glass transition temperature of −30° C. or lower, the second resin is a silicone acrylic resin having a glass transition temperature of 80°C or higher, The weight average molecular weight of the second resin is 10,000 to 100,000. A method for manufacturing printed fabrics.

[0011] [2] The water-dispersible resin is a water-dispersible urethane resin. [1] A method for producing a printed fabric according to the present invention.

[0012] [3] The ink contains a pigment. A method for producing a printed fabric according to [1] or [2].

[0013] [4] The content of the second resin is 0.2% by mass to 10.0% by mass relative to the total mass of the ink. A method for producing a printed fabric according to any one of [1] to [3].

[0014] [5] The second resin contains an organosiloxane structural unit and a structural unit derived from a (meth)acrylic acid derivative, a mass ratio of the mass of the organosiloxane structural unit per mole of the second resin as the numerator to the mass of the structural unit derived from the (meth)acrylic acid derivative per mole of the second resin as the denominator is 80.0 / 20.0 to 97.0 / 3.0; A method for producing a printed fabric according to any one of [1] to [4].

[0015] One aspect of the present invention for solving the above problem relates to an inkjet printing apparatus described in [6] below.

[0016] [6] An inkjet printing apparatus used in the method for producing a printed fabric according to any one of [1] to [5], an inkjet head that ejects ink droplets from nozzles; an ink tank for storing the ink; a circulation flow path that communicates the ink tank with the inkjet head and constitutes a flow path through which ink circulates; having Inkjet printing equipment.

[0017] One aspect of the present invention for solving the above problems relates to an ink described in [7] below.

[0018] [7] An ink for inkjet textile printing, A composition comprising water, a water-soluble organic solvent, a first resin, and a second resin, the first resin is a water-dispersible resin having a glass transition temperature of −30° C. or lower, the second resin is a silicone acrylic resin having a glass transition temperature of 80°C or higher, The weight average molecular weight of the second resin is 10,000 to 100,000. ink. [Effects of the Invention]

[0019] According to the present invention, it is possible to provide a method for producing a printed fabric, an inkjet printing apparatus, and an ink that can improve ejection stability while maintaining the texture of the fabric. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of an ink-jet printing apparatus used in the method for producing a printed fabric of the present invention. [Figure 2] FIG. 2 is a perspective view of the inkjet head in the inkjet textile printing apparatus of FIG. [Figure 3] FIG. 3 is an exploded perspective view of the inkjet head. [Figure 4] FIG. 4 is a cross-sectional view of the inkjet head. [Figure 5] FIG. 5 is an explanatory diagram showing an example of an ink circulation unit. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, embodiments of the present invention will be described in detail, but the present invention is not limited to the following embodiments.

[0022] In this specification, a numerical range expressed using "to" means a range that includes the numerical values ​​before and after "to" as the lower and upper limits.

[0023] In addition, in this specification, "(meth)acrylate" means either one or both of acrylate and methacrylate, and "(meth)acrylic" means either one or both of acrylic and methacrylic.

[0024] 1. Manufacturing method of printed fabric The method for producing a printed fabric according to this embodiment includes: an inkjet head that ejects ink droplets from nozzles; an ink tank for storing the ink; a circulation flow path that communicates the ink tank with the inkjet head and constitutes a flow path through which ink circulates; A method for producing a printed fabric using an inkjet printing apparatus having the following features: a step of ejecting the ink from the inkjet head and applying the ink to a recording medium, the ink contains water, a water-soluble organic solvent, a first resin, and a second resin; the first resin is a water-dispersible resin having a glass transition temperature of −30° C. or lower, the second resin is a silicone acrylic resin having a glass transition temperature of 80°C or higher, The weight average molecular weight of the second resin is 10,000 to 100,000.

[0025] Hereinafter, the glass transition temperature will also be referred to as "Tg."

[0026] In general, from the viewpoint of improving the texture of the printed fabric, a resin is selected for use in the ink such that its Tg is equal to or lower than the temperature of the environment in which the fabric is used. In particular, by using a water-dispersible resin with a Tg of −30° C. or lower as the first resin, the texture of the fabric can be more easily maintained.

[0027] However, because the ambient temperature of an inkjet printing apparatus is typically higher than the Tg of the first resin, the intermolecular forces between the first resin molecules in the ink are weakened, making the molecular chains more fluid. Therefore, the first resin is flexible, easily deformed, and highly adhesive. As a result, the first resin easily deforms to fit the filter shape when the ink passes through it, creating an anchoring effect. Furthermore, the contact area with the filter increases, making interactions between the filter and the resin more likely to occur. Therefore, the first resin easily adheres to the filter, causing filter clogging and reducing ejection stability. This issue of reduced ejection stability due to filter clogging is particularly pronounced when using a method for producing printed fabrics using an inkjet printing apparatus with a circulation flow path. Specifically, as the ink passes through the circulation flow path, the first resin gradually accumulates on the filter installed in the circulation flow path. Repeated accumulation of the first resin can easily lead to filter clogging and reduced ejection stability.

[0028] The reason why the above-mentioned manufacturing method can improve the discharge stability while maintaining the texture of the fabric is not entirely clear, but is thought to be as follows.

[0029] Silicone acrylic resins with a Tg of 80°C or higher have poor molecular chain flow at the ambient temperature of inkjet printing equipment, and tend to disperse as resin particles in inks containing water and water-soluble organic solvents, forming relatively hard resin particles in the ink. Such second resins are difficult to adhere to filters, and when interposed between the first resin and the filter, they can prevent the first resin from adhering to the filter. Even if the first resin does adhere to the filter, the second resin collides with the first resin adhered to the filter, which is thought to prevent filter clogging.

[0030] Generally, as mentioned above, when a resin with a Tg higher than the ambient temperature is used, the texture tends to deteriorate. However, by using a silicone acrylic resin, the surface tension of the ink is reduced, which makes it easier for the ink to spread on the fabric and suppresses penetration into the fabric in the depth direction. As a result, even if the resin has a Tg of 80°C or higher, the silicone acrylic resin makes it easier to maintain the texture.

[0031] Furthermore, when silicone acrylic resins are applied to fabrics to form coating films, they tend to be present near the surface of the coating film, and the alkyl side chains enhance the slipperiness of the fabric surface. In particular, when used as pigment-based inks or as pretreatment inks or overcoat inks for pigment-based images, the enhanced slipperiness of the fabric surface tends to improve (wet) rub fastness. A weight-average molecular weight of 10,000 or more tends to suppress mobility within the coating film, making it less likely to bleed out to the coating film surface or fall off the fabric over time, and therefore more likely to maintain (wet) rub fastness over time.

[0032] Furthermore, by using a silicone acrylic resin with a weight-average molecular weight of 10,000 or more, it becomes less compatible with the first resin, making it difficult to weaken the intermolecular forces acting between the first resins. This makes it difficult to increase the mobility of the molecular chains of the first resin, making it easier to suppress adhesion of the first resin to the filter.

[0033] Furthermore, by setting the weight-average molecular weight of the silicone acrylic resin to 100,000 or less, the compatibility between the first resin and the silicone acrylic resin in the coating film does not decrease too much, and therefore, the silicone acrylic resin is appropriately entangled with the first resin, which appropriately increases the mobility of the silicone acrylic resin molecular chains, making it easier to maintain the texture.

[0034] 1-1. Inkjet printing equipment First, the configurations of the inkjet printing device and the ink used in the method for producing a printed fabric according to this embodiment will be described.

[0035] FIG. 1 is a schematic diagram showing the configuration of an inkjet printing apparatus 200 used in the method for producing a printed fabric according to this embodiment.

[0036] As shown in FIG. 1, the inkjet printing apparatus 200 includes a transport device 210, an inkjet head 100, an ink supply device 220 (including an ink circulation unit 8), and a main tank 230.

[0037] The transport device 210 is a device for transporting the fabric (printing material) 240 relative to the inkjet head 100. The transport device 210 has, for example, a belt conveyor 211 and a rotatable feed roller 212. The belt conveyor 211 has rotatable pulleys 213a and 213b, and an endless belt 214 stretched around these pulleys 213a and 213b. The feed roller 212 is disposed opposite the pulley 213a on the upstream side in the transport direction X of the fabric 240, so as to sandwich the fabric 240 with the belt 214 and feed the fabric 240 onto the belt 214.

[0038] The inkjet head 100 is disposed so as to be able to scan, for example, in a direction transverse to the transport direction X of the fabric 240 on which an image is to be formed. The inkjet head 100 has a plurality of nozzles for ejecting ink droplets onto the fabric 240, which is the printing substrate. The inkjet head 1 is configured, for example, so that a plurality of different colored inks are supplied to the corresponding nozzles. The configuration of the inkjet head 100 will be described later.

[0039] The ink supply device 220 is disposed integrally with the inkjet head 100. The ink supply device 220 is disposed for each type of ink. For example, when four colors of ink, Y (yellow), M (magenta), C (cyan), and K (black), are used, four ink supply devices 220 are disposed on the inkjet head 100. The ink supply device 220 has an ink circulation unit 8 that extracts ink from the inkjet head 100 and introduces it back into the inkjet head 100 to circulate the ink (see FIG. 4).

[0040] The ink supply device 220 is supplied with ink from the main tank 230 via a flow path 251 connected to the main tank 230 and a valve 254. The ink supply device 220 also communicates with a common ink chamber 51 (ink chamber) (described later) of the inkjet head 100 via a flow path 252, and is connected so as to be able to supply ink of each color to a first ink port 53 (described later) that communicates with the common ink chamber 51.

[0041] The inkjet head 100 is also connected to the main tank 230 via a bypass flow path 253 that branches off from the flow path 251. At the branch point between the flow path 251 and the bypass flow path 253, a valve 254 is disposed that can switch and set the ink flow path to one or both of the flow path 251 and the bypass flow path 253. The flow path 251, the flow path 252, and the bypass flow path 253 are all, for example, flexible tubes. The valve 254 is, for example, a three-way valve.

[0042] The main tank 230 is a tank for storing ink to be supplied to the inkjet head 100. The main tank 230 is disposed separately from the inkjet head 100. The main tank 230 has, for example, a stirring device (not shown). The main tank 230 can be appropriately determined depending on the image forming performance and size of the inkjet textile printing apparatus 200. For example, if the image forming speed of the inkjet textile printing apparatus 200 is 1 m / s, the main tank 230 may be agitated. 2 / min~3m 2 / min, the capacity of the main tank 230 is, for example, 1 L.

[0043] 1-1-1. Inkjet head Fig. 2 is a perspective view of the inkjet head 100 in the inkjet textile printing apparatus 200 of Fig. 1, and Fig. 3 is an exploded perspective view of the inkjet head 100. Fig. 4 is a cross-sectional view of the inkjet head 100. Note that the cover member 9 is omitted in Figs. 3 and 4.

[0044] 3, the inkjet head 100 of this embodiment has a head chip 1, a wiring board 2, a flexible board 3, a drive circuit board 4, a manifold 5, a housing 6, a cap receiving plate 7, and a cover member 9 (see FIG. 2). Hereinafter, the stacking direction of these members will be referred to as the Z direction, and in a plane perpendicular to the Z direction, the long side direction of the cap receiving plate 7 and the nozzle openings 71 will be referred to as the X direction, and the short side direction (perpendicular to the Z direction) will be referred to as the Y direction.

[0045] The head chip 1 has a nozzle substrate 11, a flow path spacer substrate 12, and a pressure chamber substrate 13. The configuration of the head chip 1 will be explained in detail later.

[0046] Wiring substrate 2 has an opening 22 approximately in the center. Manifold 5 is arranged on one surface of wiring substrate 2 so as to correspond to opening 22, and head chip 1 is arranged on the other surface so as to correspond to opening 22. In other words, wiring substrate 2 communicates manifold 5 and head chip 1 via opening 22. A lower end of manifold 5 is fixed to the outer edge of wiring substrate 2.

[0047] The flexible substrate 3 electrically connects the drive circuit board 4 and the electrode portion of the wiring board 2. This allows signals from the drive circuit board 4 to be applied to drive electrodes provided on a partition wall (not shown) inside the head chip 1 via the flexible substrate 3.

[0048] The manifold 5 is disposed on the head chip 1 via the wiring substrate 2, and is in communication with the pressure chambers (not shown) of the head chip 1 via the wiring substrate 2 (see FIG. 4). The manifold 5 has a hollow main body 52 that forms a common ink chamber 51 (ink chamber), first to fourth ink ports 53 to 56 that form ink flow paths, and a discharge liquid chamber 57.

[0049] The common ink chamber 51 has a filter F therein for removing foreign matter from the ink, thereby dividing the common ink chamber 51 into a first liquid chamber 51a and a second liquid chamber 51b. The common ink chamber 51 stores ink to be introduced into a pressure chamber (not shown).

[0050] The first ink port 53 communicates with the first liquid chamber 51a and is used to introduce ink into the common ink chamber 51. In other words, the first ink port 53 functions as an inlet for introducing ink into the inkjet head 100. A first joint 81a is fitted onto the tip of the first ink port 53.

[0051] The second ink port 54 communicates with the first liquid chamber 51a and is used to remove air bubbles from the first liquid chamber 51a. A second joint 81b is fitted onto the tip of the second ink port 54.

[0052] The third ink port 55 communicates with the second liquid chamber 51b and is used to remove air bubbles from the second liquid chamber 51b. A third joint 82a is fitted onto the tip of the third ink port 55.

[0053] The fourth ink port 56 is connected to a discharge liquid chamber 57 which is connected to a discharge flow path (not shown) of the head chip 1. The ink discharged from the head chip 1 through the fourth ink port 56 is discharged to the outside of the inkjet head 100 through the fourth ink port 56. In other words, the fourth ink port 56 functions as an outlet that discharges ink to the outside of the inkjet head 100.

[0054] The discharge liquid chamber 57 is disposed between the discharge flow path (not shown) of the head chip 1 and the fourth ink port 56, and connects them together. This allows ink discharged from the discharge flow path (not shown) to be introduced into the fourth ink port 56.

[0055] The housing 6 is formed so that it can accommodate the head chip 1, wiring board 2, flexible board 3, manifold 5, etc. inside (see FIG. 3). The bottom surface of the housing 6 is open. Also, mounting holes 68 are formed at both ends of the housing 6 in the X direction, respectively, for mounting the housing 6 to the printer main body.

[0056] The cap receiving plate 7 has a nozzle opening 71 in approximately the center. The cap receiving plate 7 is attached so as to close the bottom opening of the housing 6 while leaving the nozzle substrate 11 exposed through the nozzle opening 71.

[0057] The cover member 9 is attached to the housing 6 (see FIG. 2).

[0058] 1-1-2. Ink circulation section FIG. 5 is an explanatory diagram showing an example of the ink circulation unit 8. As shown in FIG.

[0059] The ink circulation section 8 has a supply sub-tank 81, a circulation sub-tank 82, flow paths 252, 85 and 86 communicating between them, and a filter unit 90 arranged on the flow path 85.

[0060] The supply sub-tank 81 is filled with ink to be supplied to the common ink chamber 51 of the inkjet head 100, and is connected to the first ink port 53 of the inkjet head 100 via a flow path 252. The supply sub-tank 81 is connected to the main tank 230 via the flow path 251 and a pump 89, so that ink can be supplied from the main tank 230.

[0061] The circulation sub-tank 82 is filled with ink discharged from the discharge liquid chamber 57 (see FIG. 4) of the inkjet head 100, and is connected to the fourth ink port 56 of the inkjet head 100 via a flow path 85. In addition, a filter unit 90 is disposed on the flow path 85, and is capable of removing foreign matter in the ink discharged from the discharge liquid chamber 57.

[0062] The supply sub-tank 81 and the circulation sub-tank 82 are provided at different positions in the Z direction (gravity direction) with respect to the nozzle surface (hereinafter also referred to as the "position reference surface") of the head chip 1. This generates a pressure P1 due to the head difference between the position reference surface and the supply sub-tank 81, and a pressure P2 due to the head difference between the position reference surface and the circulation sub-tank 82.

[0063] The supply sub-tank 81 and the circulation sub-tank 82 are connected via a flow path 86. Then, ink can be returned from the circulation sub-tank 82 to the supply sub-tank 81 by pressure applied by a pump 88.

[0064] That is, the supply sub-tank 81, the flow path 252, the flow paths within the inkjet head 100 (common ink chamber 51, discharge liquid chamber 57), the flow path 85, the circulation sub-tank 82, and the flow path 86 constitute the circulation flow path 87 of the ink circulation unit 8.

[0065] Furthermore, the pressures P1 and P2 can be adjusted by appropriately changing the ink filling amount in each sub-tank and the position of each sub-tank in the Z direction (gravity direction).Then, the pressure difference between the pressures P1 and P2 allows the ink to circulate through the inkjet head at an appropriate circulating flow rate. 100 can be circulated. This allows air bubbles and foreign matter generated in the head chip 1 to be removed by the filter unit 90, while preventing nozzle clogging and ejection defects. Furthermore, according to the method for producing a printed fabric according to this embodiment, it is possible to prevent a decrease in ejection stability due to filter clogging in the filter unit 90.

[0066] The material of the filter is not particularly limited, but examples thereof include resins such as nylon and metals such as SUS. These may also be filters manufactured by laser processing or etching. Of these, SUS is preferred from the viewpoint of durability.

[0067] The opening diameter of the filter is preferably 1 μm to 20 μm, more preferably 3 μm to 10 μm, and even more preferably 5 μm to 10 μm. An opening diameter of 20 μm or less can remove air bubbles and foreign matter generated in the ink, making it easier to prevent nozzle clogging and ejection defects. Furthermore, an opening diameter of 1 μm or more can allow dispersed components in the ink, such as water-dispersible resins and pigments, to pass through more easily, making it less likely for filter clogging to occur. In the method for producing a printed fabric according to this embodiment, by using the ink described below, clogging by the first resin can be prevented and ejection stability can be easily improved, even in a filter with an opening diameter equal to or less than the upper limit mentioned above.

[0068] 5 shows an example in which the filter unit 90 is disposed in the flow path 85, but the present invention is not limited to this. The filter unit 90 may be disposed in any one of the circulation flow paths 87 of the ink circulation section 8, for example.

[0069] Furthermore, although the inkjet head 100 in FIGS. 2 to 4 is an example in which the ejection method is a piezo method, the present invention is not limited to this and may be a thermal method.

[0070] 1 is not particularly limited, and may be a single-pass system or a scan system. The single-pass system is preferable because it is effective for high-speed printing. A single-pass inkjet printing apparatus preferably uses a line-head inkjet head.

[0071] 1-2.Ink Next, the composition of the ink (inkjet ink) used in the method for producing a printed fabric according to this embodiment will be described.

[0072] The ink contains water, a water-soluble organic solvent, a first resin, and a second resin, the first resin is a water-dispersible resin having a Tg of −30° C. or less, The second resin is a silicone acrylic resin having a weight average molecular weight of 10,000 to 100,000.

[0073] 1-2-1. First resin The first resin is a water-dispersible resin having a Tg of −30° C. or lower. The first resin has the function of fixing pigments and the like to fabric. The first resin can be contained in the ink as resin particles (first resin particles).

[0074] The Tg of the first resin is a value measured by differential scanning calorimetry in accordance with JIS K 7121:2012 under measurement conditions of a temperature rise rate of 10°C / min.

[0075] The Tg of the first resin is preferably −80° C. to −30° C., and more preferably −70° C. to −40° C. By setting it to −80° C. or higher, it becomes easier to maintain discharge stability. By setting it to −30° C. or lower, it becomes easier to maintain the texture of the fabric as described above. By setting it to −40° C. or lower, it becomes easier to maintain the texture of the fabric.

[0076] Examples of the first resin include acrylic resins, styrene-acrylic resins, urethane resins, polyester resins, and olefin resins. When higher water resistance and washing fastness are required, it is preferable to introduce a cross-linking component that self-crosslinks when heated into the first resin, as long as the texture is not impaired. These may be used alone or in combination of two or more.

[0077] Among the first resins, urethane-based resins, acrylic resins, and styrene-acrylic resins are preferred, with urethane-based resins being more preferred. Urethane-based resins, acrylic resins, and styrene-acrylic resins are likely to form intermolecular hydrogen bonds with polar groups, such as hydroxy groups, ester groups, and amide groups, in fabrics. Therefore, when used as a pigment-based ink or a pretreatment ink or overcoat ink for a pigment-based image, it is believed that these resins are likely to further enhance the adhesion of the pigment to fabrics and improve wet rub fastness. In particular, urethane-based resins contain nitrogen atoms, oxygen atoms, and hydrogen atoms in the urethane bond site, which allows for the formation of stronger hydrogen bonds. Therefore, in the above cases, it is believed that these resins are likely to further enhance the adhesion of the pigment to fabrics and improve wet rub fastness over time.

[0078] Commercially available water-dispersible urethane resins with a glass transition point of −30°C or less include Superflex 300 (glass transition point −42°C), Superflex 470 (glass transition point −31°C), Superflex 500M (glass transition point −39°C), and Superflex 740 (glass transition point −34°C), all manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.

[0079] The water-dispersible styrene (meth)acrylic resin and the water-dispersible (meth)acrylic resin are not particularly limited, and commercially available products can be used.

[0080] Commercially available water-dispersible styrene (meth)acrylic resins or water-dispersible (meth)acrylic resins having a glass transition point of −30° C. or less include Mowinyl 6751D (glass transition point: −32° C.), Mowinyl 6960 (glass transition point: −32° C.), and Mowinyl 966A (glass transition point: −32° C.), all manufactured by The Nippon Synthetic Chemical Industry Co., Ltd.

[0081] The average particle size of the first resin is not particularly limited, but from the viewpoint of preventing nozzle clogging of the inkjet head, the upper limit is preferably 300 nm or less, and more preferably 130 nm or less. From the viewpoint of easily improving the water dispersibility of the first resin, the lower limit is preferably 20 nm or more. The average particle size of the first resin can be measured as the dispersed particle size (Z average) using, for example, a Zataizer Nano S90 manufactured by Melvern.

[0082] The content of the first resin is preferably 1.0% by mass to 15.0% by mass relative to the total mass of the pigment ink. When the content of the first resin is 1.0% by mass or more, the viscosity of the pigment ink is easily increased appropriately, which tends to improve ejection stability. The wet rub fastness of the resulting image is also easily improved. When the content of the first resin is 15.0% by mass or less, the viscosity of the pigment ink does not become too high, which makes nozzle clogging less likely to occur. For the same reason, the content of the first resin is more preferably 2.0% by mass to 12.0% by mass relative to the pigment ink.

[0083] 1-2-2. Second resin The second resin is a silicone acrylic resin having a Tg of 80° C. or higher, and the weight average molecular weight of the second resin is 10,000 to 100,000.

[0084] The Tg of the second resin is a value measured by differential scanning calorimetry in accordance with JIS K 7121:2012 at a temperature rise rate of 10°C / min. The weight average molecular weight of the second resin is a value measured in polystyrene equivalent terms by gel permeation chromatography.

[0085] The Tg of the second resin is preferably 80°C to 120°C, and more preferably 90°C to 110°C. By setting the Tg at 90°C or higher, the molecular chains become less likely to flow at the ambient temperature of the inkjet printing device, making it easier to form harder resin particles in the ink. As a result, even if the first resin adheres to the filter, the second resin collides with the first resin, making it easier to prevent filter clogging, thereby improving discharge stability. Furthermore, by setting the Tg at 120°C or lower, the texture is more easily maintained, and by setting the Tg at 110°C or lower, the texture is more easily maintained.

[0086] The weight-average molecular weight of the second resin is preferably 10,000 to 50,000. If it is 10,000 or more, as described above, wet rub fastness is more likely to be maintained over time, and adhesion of the first resin to the filter is more likely to be suppressed. If it is 50,000 or less, the compatibility between the first resin and the silicone acrylic resin in the coating film is not excessively reduced, and moderate entanglement with the first resin occurs, moderately increasing the mobility of the molecular chains of the silicone acrylic resin, making it easier to maintain the texture.

[0087] The second resin is a silicone acrylic resin that exists in a dispersed state as resin particles in an aqueous medium. In this embodiment, the ink is an aqueous medium containing water and an optional water-soluble organic solvent. Therefore, the second resin is also contained in the ink as resin particles. Whether the second resin exists as resin particles can be confirmed by determining whether a peak corresponding to the second resin is present when the dispersed particle size (Z average) of the ink is measured using a particle size measuring device. An example of a particle size measuring device is the "Zataizer Nano S90" manufactured by Melvern.

[0088] The average particle size of the second resin is not particularly limited, but from the viewpoint of preventing nozzle clogging of the inkjet head, the upper limit is preferably 350 nm or less, and more preferably 300 nm or less. From the viewpoint of easily suppressing adhesion of the first resin to the filter, the lower limit is preferably 200 nm or more. The average particle size of the second resin can be measured as the dispersed particle size (Z average) using, for example, a Zataizer Nano S90 manufactured by Melvern.

[0089] The second resin is a copolymer containing polyorganosiloxane structural units and structural units derived from a (meth)acrylic acid derivative.

[0090] The copolymer may be, for example, a graft copolymer in which a structural unit derived from polyorganosiloxane is graft-polymerized with a polymerizable monomer such as a (meth)acrylic acid ester. The copolymer may also be, for example, a copolymer in which the side chains or ends of a (meth)acrylic resin or the like are modified with a polyorganosiloxane. Among these, a graft copolymer in which a (meth)acrylic acid ester or the like is graft-polymerized with a polymer containing a structural unit derived from polyorganosiloxane is preferred. Such a graft copolymer has a structure in which the polyorganosiloxane portion forms the trunk and the (meth)acrylic acid ester or the like forms the branches, which facilitates moderate compatibility with the first resin contained in the ink and facilitates improving the texture. The form of copolymerization is not limited to graft copolymerization, but may be random copolymerization or block copolymerization. Among these, graft copolymerization is preferred from the viewpoint of facilitating the improvement of the texture.

[0091] The second resin may also have an ionic group. The ionic group of the second resin may be an ionic group that forms a pair with the ionic group of the fabric (or the ionic group of the flocculant attached to the fabric). For example, since cationic flocculants usually have cationic groups, the second resin may be an anionic second resin having an anionic group. Examples of the anionic group include a carboxy group, a sulfonic acid group, and a phosphonic acid group.

[0092] That is, the second resin preferably contains a structural unit derived from a polyorganosiloxane having a radical polymerizable group and a structural unit derived from another polymerizable monomer copolymerizable therewith.

[0093] Examples of polyorganosiloxanes having a radical polymerizable group include polyorganosiloxanes represented by the following formula (1).

[0094] [ka]

[0095] In the above formula (1), R 1 , R 2 and R 3 are each independently a hydrocarbon group having 1 to 10 carbon atoms.

[0096] In the above formula (1), Y is a radical polymerizable group selected from the group consisting of a vinyl group, an allyl group, and a γ-(meth)acryloxypropyl group.

[0097] In the above formula (1), X 1 and X 2 are each independently a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or a group represented by the formula (2): SiR 4 R 5 R 6 It is a group represented by the formula: m is an integer of 1 to 10000. n is an integer of 1 or more. The siloxane chain may be branched.

[0098] In addition, the above formula (2): SiR 4 R 5 R 6 In R 4 and R 5 are each independently a hydrocarbon group having 1 to 10 carbon atoms. 6 is a radical polymerizable group selected from the group consisting of a vinyl group, an allyl group, and a γ-(meth)acryloxypropyl group, or a hydrocarbon group having 1 to 10 carbon atoms.

[0099] Examples of (meth)acrylic acid derivatives include (meth)acrylic acid esters. In this specification, (meth)acrylic refers to acrylic, methacrylic, or both.

[0100] The (meth)acrylic acid ester is an alkyl ester, a hydroxyalkyl ester, or an alkoxyalkyl ester of (meth)acrylic acid. Examples of the (meth)acrylic acid ester include methyl (meth)acrylate, ethyl (meth)acrylate, isopropyl (meth)acrylate, n-propyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, n-octyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, and 2-methoxyethyl (meth)acrylate. Among these, methyl methacrylate and 2-hydroxyethyl methacrylate are preferred.

[0101] The second resin may further contain a structural unit derived from a polymerizable monomer other than those described above. Examples of the polymerizable monomer other than those described above include ethylenically unsaturated carboxylic acids such as (meth)acrylic acid, styrenes, etc. For example, from the viewpoint of exhibiting anionic properties, the second resin may further contain a structural unit derived from an ethylenically unsaturated carboxylic acid such as (meth)acrylic acid.

[0102] The graft copolymerization can be carried out by a known method, for example, by emulsifying and dispersing the polyorganosiloxane represented by the above formula (1) and a copolymerizable compound such as a (meth)acrylic acid ester in water, and polymerizing them in the presence of a radical polymerization initiator.

[0103] Examples of commercially available silicone acrylic resins include Chaline LC190, Chaline R-170, R170S, Chaline FE-230N, FE-502, and R-170BX (manufactured by Nissin Chemical Industry Co., Ltd.).

[0104] The content of the second resin is preferably 0.2% by mass to 10.0% by mass relative to the total mass of the ink. When the content of the second resin is 0.2% by mass or more, the viscosity of the pigment ink is easily increased appropriately, which tends to improve ejection stability. In addition, the slipperiness of the fabric surface is easily increased, which tends to improve wet rub fastness both initially and over time. When the content of the second resin is 10.0% by mass or less, the content ratio of the high Tg second resin is reduced, which makes it easier to maintain the texture. For the same reasons, the content of the second resin is more preferably 0.2% by mass to 3.0% by mass relative to the total mass of the pigment ink.

[0105] In the second resin, the ratio of the mass of organosiloxane structural units per mole of the second resin as the numerator to the mass of structural units derived from a (meth)acrylic acid derivative per mole of the second resin as the denominator is preferably 80.0 / 20.0 to 97.0 / 3.0. A ratio of 80.0 / 20.0 or higher reduces the surface tension of the ink, making it easier to wet and spread. This further reduces penetration into the fabric depth, making it easier to maintain the texture. Furthermore, the slipperiness of the fabric surface is improved, improving both initial and aging wet rub fastness. On the other hand, a ratio of 97.0 / 3.0 or lower increases the Tg of the second resin, making it easier to form relatively hard resin particles in the ink. Therefore, even if the first resin adheres to the filter, the second resin collides with the first resin, preventing filter clogging and improving ejection stability. From the same viewpoint, it is more preferable that the ratio is 90.0 / 10.0 to 95.0 / 5.0.

[0106] 1-2-3. Pigments The ink according to this embodiment preferably contains a pigment. The pigment is dispersed in an ink containing water and a water-soluble organic solvent, forming relatively hard pigment dispersion particles in the ink. As a result, the frequency of contact between the first resin and the filter can be reduced. Even if the first resin adheres to the filter, the pigment dispersion particles collide with the first resin, making it easier to prevent filter clogging.

[0107] In the case of inks containing pigment, the pigment content is not particularly limited, but is preferably within the range of 1.5% to 15.0% by mass relative to the total mass of the pigment ink. This makes it easy to adjust the viscosity of the pigment ink within the above range and enables the formation of high-density images. When the pigment content is 1.5% by mass or more, high-density images are easily formed. When the pigment content is 15.0% by mass or less, the ink viscosity does not become too high, and ejection stability is less likely to be impaired. For the same reasons, the pigment content is more preferably within the range of 2.0% to 10.0% by mass relative to the total mass of the pigment ink.

[0108] 1-2-3-1. Pigments Examples of pigments include organic pigments or inorganic pigments with the following numbers listed in the Color Index.

[0109] Examples of red or magenta pigments include Pigment Red 3, 5, 19, 22, 31, 38, 43, 48:1, 48:2, 48:3, 48:4, 48:5, 49:1, 53:1, 57:1, 57:2, 58:4, 63:1, 81, 81:1, 81:2, 81:3, 81:4, 88, 104, 108, 112, 122, 123, 144, 146, 149, 166, 168, 169, 170, 177, 178, 179, 184, 185, 208, 216, 226, 257, Pigment Violet 3, 19, 23, 29, 30, 37, 50, 88, and Pigment Orange 13, 16, 20, and 36.

[0110] Examples of blue or cyan pigments include Pigment Blue 1, 15, 15:1, 15:2, 15:3, 15:4, 15:6, 16, 17-1, 22, 27, 28, 29, 36, and 60.

[0111] Examples of green pigments include Pigment Green 7, 26, 36, and 50.

[0112] Examples of yellow pigments include Pigment Yellow 1, 3, 12, 13, 14, 17, 34, 35, 37, 55, 74, 81, 83, 93, 94, 95, 97, 108, 109, 110, 137, 138, 139, 153, 154, 155, 157, 166, 167, 168, 180, 185, and 193.

[0113] Examples of black pigments include Pigment Black 7, 28, and 26.

[0114] Commercially available examples of pigments include Cromofine Yellow 2080, 5900, 5930, AF-1300, 2700L, Cromofine Orange 3700L, 6730, Cromofine Scarlet 6750, Cromofine Magenta 6880, 6886, 6891N, 6790, 6887, Cromofine Violet RE, Cromofine Red 6820, 6830, Cromofine Blue HS-3, 5187, 5108, 5197, 5085N, SR-5020, 5026, 5050, 4920, 4927, 4937, 4824, 4933GN-EP, 4940, 4973, 5205, 5208, 5214, 5221, 5000P, Chromofine Green 2GN, 2GO, 2G-550D, 5310, 5370, 6830, Chromofine Black A-1103, Seika Fast Yellow 10GH, A-3, 2035, 2054, 2200, 2270, 2300, 2400(B), 2500, 2600, ZAY-260, 2700(B), 2770, Seika Fast Red 8040, C405( F), CA120, LR-116, 1531B, 8060R, 1547, ZAW-262, 1537B, GY, 4R-4016, 3820, 3891, ZA-215, Seika Fast Carmine 6B1476T-7, 1483LT, 3840, 3870, Seika Fast Bordeaux 10B-430, Seika Light Rose R40, Seika Light Violet B800, 7805, Seika Fast Maroon 460N, Seika Fast Orange 900, 2900, Seika Light Blue C718, A612, Shea Nimblue 4933M, 4933GN-EP, 4940, 4973 (manufactured by Dainichi Seika Color & Chemicals Co., Ltd.); KETYellow 401, 402, 403, 404, 405, 406, 416, 424, KETOrange 501, KETRed 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 336, 337, 338, 346, KETBlue 101, 102, 103, 104, 105, 106, 111, 118, 124, KETGreen 201 (manufactured by Dainippon Ink & Chemicals Co., Ltd.);ColortexYellow301, 314, 315, 316, P-624, 314, U10GN, U3GN, UNN, UA-414, U263, FinecolYellowT-13, T-05, PigmentYello w1705, ColortexOrange202, ColortexRed101, 103, 115, 116, D3B, P-625, 102, H-1024, 105C, UFN, UCN, UBN, U3BN, URN, UGN, UG276, U456, U457, 105C, USN, Colortex Maroon601, ColortexBrownB610N, ColortexViolet600, PigmentRed122, Colortex Blue516, 517, 518, 519, A818, P-908, 510, ColortexGreen402, 403, ColortexBlack702, U905 (manufactured by Sanyo Shiki Co., Ltd.); LionolYellow1405 G, Lionol Blue FG7330, FG7350, FG7400G, FG7405G, ES, ESP-S (manufactured by Toyo Ink Co., Ltd.), Toner Magenta E02, Permanent Rubin F6B, Toner Yellow HG, Permanent Yellow GG-02, Hostapearm Blue B2G (manufactured by Hoechst Industrie); Novoperm P-HG, Hostaperm Pink E, Hostaperm Blue B2G (manufactured by Clariant); carbon black #2600, #2400, #2350, #2200, #1000, #990, #980, #970, #960, #950, #850, MCF88, #750, #650, MA600, MA7, MA8, MA11, MA100, MA100R, MA77, #52, #50, #47, #45, #45L, #40, #33, #32, #30, #25, #20, #10, #5, #44, and CF9 (manufactured by Mitsubishi Chemical Corporation).

[0115] 1-2-3-2. Anionic pigment dispersants When the ink contains a pigment, it is preferable that the ink contains an anionic pigment dispersant. The anionic pigment dispersant adheres to the surface of the pigment, making it easier to disperse the pigment in water. A pigment with an anionic pigment dispersant attached thereto dispersed in a dispersion medium (such as water) is called an anionic pigment dispersion. An anionic pigment dispersion is also simply called a pigment dispersion. An anionic pigment dispersion contains "a pigment with an anionic pigment dispersant attached thereto" and "a dispersion medium in which the pigment with an anionic pigment dispersant attached thereto" is dispersed. The anionic pigment dispersion may contain other ingredients.

[0116] 1-2-3-3. Self-dispersing pigment The pigment may be a self-dispersing pigment. A self-dispersing pigment is a pigment particle whose surface is modified with a group having a hydrophilic group. A self-dispersing pigment has pigment particles and hydrophilic groups bonded to the surface of the pigment particles.

[0117] Examples of hydrophilic groups include carboxy groups, sulfonic acid groups, and phosphorus-containing groups, and examples of phosphorus-containing groups include phosphoric acid groups, phosphonic acid groups, phosphinic acid groups, phosphite groups, and phosphate groups.

[0118] Commercially available examples of self-dispersing pigments include Cabot's Cab-0-Jet® 200K, 250C, 260M, and 270V (sulfonic acid group-containing self-dispersing pigments). Other commercially available examples of self-dispersing pigments include Cabot's Cab-0-Jet® 300K (carboxylic acid group-containing self-dispersing pigments) and Cab-0-Jet® 400K, 450C, 465M, 470V, and 480V (phosphate group-containing self-dispersing pigments).

[0119] 1-2-4. Water-soluble organic solvents The ink according to this embodiment contains a water-soluble organic solvent, which can further improve the ejection stability when inkjet printed.

[0120] The water-soluble organic solvent is not particularly limited as long as it is compatible with water, and examples thereof include polyhydric alcohols (for example, dihydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, and polypropylene glycol, and trihydric or higher alcohols such as glycerin, trimethylolpropane, and hexanetriol); polyhydric alcohol ethers (for example, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monophenyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, and diethylene glycol dimethyl ether); ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether; monohydric alcohols (e.g., methanol, ethanol, propanol, pentanol, hexanol, cyclohexanol, benzyl alcohol); amines (e.g., ethanolamine, N-ethyldiethanolamine, morpholine, N-ethylmorpholine, ethylenediamine, diethylenediamine, triethylenetetramine); amides (e.g., formamide, N,N-dimethylformamide, N,N-dimethylacetamide); heterocycles (e.g., 2-pyrrolidone, N-methyl-2-pyrrolidone, N-cyclohexyl-2-pyrrolidone, 2-oxazolidone, 1,3-dimethyl-2-imidazolidine), sulfoxides (e.g., dimethyl sulfoxide); and sulfones (e.g., sulfolane).

[0121] Furthermore, from the viewpoint of further improving ejection stability by inkjet printing, it is preferable that the water-soluble organic solvent contains a water-soluble organic solvent having a boiling point of 180°C or higher, preferably 190°C or higher, and more preferably 200°C or higher. The upper limit can be, for example, 350°C. Examples of water-soluble organic solvents having a boiling point of 180°C or higher include dihydric alcohols and trihydric or higher alcohols. Examples of dihydric alcohols include ethylene glycol (boiling point 197°C), 1,3-butanediol (boiling point 208°C), 1,6-hexanediol (boiling point 223°C), and polypropylene glycol. Examples of trihydric or higher alcohols include glycerin (boiling point 290°C) and trimethylolpropane (boiling point 295°C).

[0122] The content of the water-soluble organic solvent is, for example, 20% by mass to 70% by mass, and preferably 30% by mass to 60% by mass, relative to the total mass of the pigment ink.

[0123] 1-2-5.Water The ink according to this embodiment contains water. The water according to this embodiment is not particularly limited, and may be ion-exchanged water, distilled water, or pure water.

[0124] The water content is, for example, 20% to 70% by mass, and preferably 30% to 60% by mass, relative to the total mass of the pigment ink.

[0125] 1-2-6. Other ingredients The pigment ink may further contain other components in addition to those described above, as necessary. Examples of the other components include surfactants, preservatives, etc.

[0126] The surfactant can reduce the surface tension of the pigment ink, the first treatment liquid, and the second treatment liquid, thereby increasing the wettability of the pigment ink to the fabric. The type of surfactant is not particularly limited, and can be, for example, an acetylene glycol surfactant, a silicone surfactant, a fluorine surfactant, etc. Examples of commercially available surfactants include Olfine E1010 (manufactured by Nissin Chemical Industry Co., Ltd.) and TEGOWET250 (manufactured by Evonik).

[0127] The content of the surfactant is preferably 0.05% by mass to 1.0% by mass, more preferably 0.1% by mass to 0.6% by mass, based on the total mass of the pigment ink. From the viewpoint of ejection stability, the content is preferably 0.05% by mass or more, and from the viewpoint of suppressing the mobility of the molecular chains of the first resin and thus preventing filter clogging due to partial mixing of the surfactant with the first resin, the content is preferably 1.0% by mass or less.

[0128] Examples of the antiseptic or antifungal agent include aromatic halogen compounds (e.g., Preventol CMK), methylene dithiocyanate, halogen-containing nitrogen-sulfur compounds, 1,2-benzisothiazolin-3-one (e.g., Proxel GXL(S) (manufactured by Lonza)), and the like.

[0129] The pigment ink may further contain a crosslinking agent for crosslinking the resin that constitutes the resin particles. The crosslinking agent is preferably a compound having at least two functional groups in the molecule that react with the crosslinkable groups (hydroxyl groups, carboxyl groups, and ketone groups) of the resin particles. Examples of crosslinking groups that react with hydroxyl groups include isocyanate groups and blocked isocyanate groups. Examples of crosslinking groups that react with carboxyl groups include oxazolyl groups, aziridine groups, and carbodiimide groups. Examples of crosslinking groups that react with ketone groups include hydrazide groups.

[0130] Specifically, examples of crosslinking agents that react with hydroxyl groups include Fixer N (a blocked isocyanate-based crosslinking agent, manufactured by Matsui Pigment Chemical Industry Co., Ltd.). Examples of crosslinking agents that react with carboxyl groups include Fixer F (an aziridine-based crosslinking agent, manufactured by Matsui Pigment Chemical Industry Co., Ltd.). Examples of crosslinking agents that react with ketone groups include adipic acid dihydrazide (ADH, a hydrazine-based crosslinking agent).

[0131] 1-2-7. Ink properties From the viewpoint of improving ejection stability from the nozzles of the inkjet head, the viscosity of the ink is preferably 1 cP to 100 cP. From the viewpoint of further improving the ejection stability, the viscosity of each liquid is preferably 1 cP to 50 cP, and more preferably 1 cP to 15 cP.

[0132] From the viewpoint of improving ejection stability from the nozzles of the inkjet head, the surface tension of the ink is preferably 20 mN / m to 50 mN / m. From the viewpoint of improving wettability to the substrate and forming higher-resolution images, the surface tension of the ink is more preferably 20 mN / m to 35 mN / m. The surface tension of the ink can be adjusted to fall within the above range by changing the types or amounts of the surfactant and organic solvent.

[0133] 1-3. Processing liquid A treatment liquid other than that of the present invention may be used, and the treatment liquid may contain a cationic flocculant.

[0134] 1-3-1. Water-soluble cationic flocculant Water-soluble cationic flocculants aggregate pigments and other particles contained in ink. Aggregation by water-soluble cationic flocculants utilizes electrical action. Hereinafter, water-soluble cationic flocculants may also be simply referred to as cationic flocculants.

[0135] Cationic flocculants that cause aggregation by electrical action include compounds having cationic groups and polyvalent metal salts. These cationic flocculants can interact or react with the anionic pigment dispersant contained in the pigment ink.

[0136] Examples of the cationic group in the compound having a cationic group include a secondary amino group, a tertiary amino group, and a quaternary ammonium base. Examples of the compound having a cationic group include a cationic resin and a cationic surfactant, and preferably a cationic resin. A cationic resin can also be called a cationic polymer.

[0137] Examples of cationic flocculants include cationic urethane resins, cationic olefin resins, and cationic alkylamine resins. Examples of commercially available products include MPT-60 (manufactured by Mitsubishi Pencil Co., Ltd.), Unisense KHE100L (manufactured by Senka Corporation), and MZ477 (urethane resin, manufactured by Takamatsu Oil & Fat Co., Ltd.). Among these, cationic alkylamine resins MPT-60 and Unisense KHE100L (manufactured by Senka Corporation) are preferred as cationic resins. This makes it easier for the flocculant to interact or react with the anionic pigment dispersant.

[0138] Polyvalent metal salts can be water-soluble compounds having a divalent or higher polyvalent metal ion and an associated anion. Examples of polyvalent metal ions include Ca 2+ , Cu 2+ , Ni 2+ , Mg 2+ , Zn 2+ , Ba 2+ Divalent metal ions such as Al 3+ , Fe 3+ , Cr 3+ Examples of anions include trivalent metal ions such as Cl - , I - , Br-, SO4 2- , ClO 3- , NO 3- , and HCOO - , CH3COO - Examples of such polyvalent metal salts include metal salts of organic acids such as calcium salts, magnesium salts, nickel salts, and aluminum salts, such as zinc acetate dihydrate, magnesium nitrate, calcium chloride, magnesium chloride, aluminum chloride, magnesium sulfate, and acetic acid. Of these, calcium salts and magnesium salts are preferred, and calcium nitrate and calcium chloride are more preferred.

[0139] Among these, compounds having a cationic group or organic acids are preferred, and compounds having a cationic group are more preferred.

[0140] The content of the cationic flocculant is preferably 0.1% by mass to 15.0% by mass, and more preferably 0.5% by mass to 8.0% by mass, relative to the total mass of the treatment liquid.

[0141] 1-3-2. Water-soluble organic solvents The treatment liquid according to this embodiment may contain a water-soluble organic solvent, which can further improve the ejection stability when inkjet printed.

[0142] The water-soluble organic solvent may be the same as the water-soluble organic solvent that may be contained in the ink.

[0143] The content of the water-soluble organic solvent is, for example, 20% by mass to 70% by mass, and preferably 30% by mass to 60% by mass, relative to the total mass of the treatment liquid.

[0144] 1-3-3.Water The treatment liquid according to this embodiment may contain water. The water according to this embodiment is not particularly limited, and may be ion-exchanged water, distilled water, or pure water.

[0145] The water content is, for example, 20 to 70% by mass, and preferably 30 to 60% by mass, based on the total mass of the treatment liquid.

[0146] 1-3-4. Other ingredients The treatment liquid may further contain other components in addition to those described above, as necessary. Examples of the other components include the same components that can be used in ink.

[0147] 1-4. Each step in the manufacturing process of printed fabrics Next, each step of the method for producing a printed fabric of the present invention will be described with reference to FIG.

[0148] In the method for producing a printed fabric according to this embodiment, the ink is ejected from the inkjet head 100 of the inkjet printing apparatus 200 shown in FIG.

[0149] Specifically, the method for manufacturing a printed fabric according to this embodiment includes 1) a step of ejecting ink from an inkjet head 1 to apply ink droplets onto the fabric 240 (ink application step), and 2) a step of drying the ink applied to the fabric 240 (drying step).

[0150] Regarding step 1 (ink application process) In the ink application step, at least the ink described above is ejected from the inkjet head 100 of the inkjet printing apparatus 200 shown in FIG.

[0151] Examples of fiber materials that make up the fabric 240 include, but are not limited to, natural fibers such as cotton (cellulose fiber), silk, and wool, chemical fibers such as nylon, rayon, polyurethane, polyester, and acrylic resin, and woven, knitted, and nonwoven fabrics made of composite fibers that combine these.

[0152] The ejection frequency of the inkjet head 100 is preferably 20 to 50 kHz in order to enable high-speed printing.

[0153] In this embodiment, as described above, ink is ejected from the inkjet head 100 of the inkjet textile printing apparatus 200 in Fig. 1. Inside the inkjet head 100, ink is constantly circulated through the circulation flow paths 87 of the ink circulation unit 8, i.e., through a plurality of discharge flow paths (not shown) provided for each nozzle, so that ink retention near the nozzle outlets and resulting nozzle clogging can be suppressed.

[0154] The surface of the fabric 240 onto which the ink is applied may be heated. This can increase the drying speed after the ink is applied, making it easier to prevent bleeding of the image. The surface temperature of the fabric 240 when the ink is applied is preferably 35°C to 70°C.

[0155] The heating method is not particularly limited, and the fabric 240 can be heated from the side opposite to the side to which ink is applied. The heating means is not particularly limited, and may be any of an infrared heater, an electric heating wire, a UV lamp, gas, a hot air dryer, etc. Among these, heating by an electric heating wire or an infrared heater is preferred from the standpoints of safety and energy efficiency.

[0156] Regarding step 2 (drying process) In the drying step, the ink applied to the fabric 240 is dried to remove the water and solvent components in the ink.

[0157] The drying method is not particularly limited, and may be a method using a heater, a hot air dryer, a heated roller, etc. Among these, it is preferable to use a hot air dryer and a heater to heat and dry both sides of the fabric 240.

[0158] When drying is performed using a heating means such as a heater, the heating means may be arranged downstream of the inkjet head 100 in the transport direction of the fabric 240 to dry the ink. Alternatively, the heating means may be arranged upstream of the inkjet head 100 in the transport direction of the fabric 240 to dry the ink using heat stored in the fabric 240 before the ink is ejected from the inkjet head 100. Alternatively, the heating means may be arranged both upstream and downstream of the inkjet head 100 in the transport direction of the fabric 240 to dry the ink.

[0159] The drying temperature is not particularly limited, but may be, for example, not higher than 160° C. The drying time may vary depending on the drying temperature, but may be, for example, about 0.5 to 30 minutes.

[0160] Furthermore, the method for producing a printed fabric according to this embodiment may further include other steps in addition to those described above, depending on the type of inkjet ink. For example, before step 1), a step 3) of applying a pretreatment agent to the fabric 140 (pretreatment step) may be performed, and after step 2), a step 4) of drying the fabric 240 on which the image has been formed, to fix the image to the fabric 240 (fixing step) may be performed.

[0161] Regarding step 3 (pre-treatment process) In the method for producing a printed fabric according to this embodiment, from the viewpoint of preventing ink bleeding and improving fixation, an image may be formed on fabric 240 that has been pretreated with a pretreatment agent containing water, polyvalent metal ions, or a polymer, as necessary.

[0162] The pretreatment may be carried out by offline processing in which an image is formed on the fabric 240 to which a pretreatment agent has been applied, or by inline processing in which the pretreatment is carried out continuously with the image formation.

[0163] The method for applying the pretreatment agent is not particularly limited, and may be an inkjet method or a coating method using a coater or the like.

[0164] Regarding step 4 (fixing process) In the fixing step, the ink that has dried on the fabric 240 is heated to fix it to the fabric 240. This fixes the solid colorant to the fabric 240, and the original hue of the ink is expressed.

[0165] Fixing methods include, for example, heat treatment by atmospheric pressure steam method, high pressure steam method, thermofix method, etc. The temperature during heat treatment is preferably 120°C to 200°C, more preferably 140°C to 180°C.

[0166] Furthermore, after the above step 4), 5) a step (cleaning step) of removing the dye and pretreatment agent that could not be dyed onto the fabric 240, and 6) a step (drying step) of drying the cleaned fabric 240 may be further carried out.

[0167] Regarding step 5 (cleaning process) In the washing step, solid colorants and pretreatment agents that could not be fixed to the fabric 240 after the fixing step are removed. A conventionally known washing method can be used to remove solid colorants that could not be fixed to the fabric 240. For example, cellulose fibers are generally washed with water and hot water, then treated in a soaping bath containing a nonionic detergent, followed by hot water and water rinsing. Removing unfixed solid colorants tends to improve washfastness, waterfastness, and sweatfastness.

[0168] Regarding step 6 (drying process) The drying step is performed after the washing step to dry the washed fabric 240. The drying method is not particularly limited, but may be a method of wringing out the washed fabric 240, hanging it to dry, or drying it using a dryer (heat roll, iron, etc.).

[0169] 2. Ink The ink according to this embodiment is an ink for inkjet textile printing, A composition comprising water, a water-soluble organic solvent, a first resin, and a second resin, the first resin is a water-dispersible resin having a glass transition temperature of −30° C. or lower, the second resin is a silicone acrylic resin having a glass transition temperature of 80°C or higher, The weight average molecular weight of the second resin is 10,000 to 100,000.

[0170] The components that the ink may contain, as well as specific examples and preferred ranges of each component, are the same as those of the ink used in the above-mentioned method for producing a printed fabric (described in "1-2. Ink"). [Example]

[0171] The present invention will be specifically explained below with reference to examples, but the present invention is not limited to these examples.

[0172] A-1. Preparation of pretreatment solution The following components were mixed together to a total amount of 100.0 parts by mass to prepare a pretreatment liquid. ------------------------------------------------------------------ Pretreatment solution composition ------------------------------------------------------------------ MPT-60 (Mitsubishi Pencil Co., Ltd., flocculant): 3.00 parts by mass Glycerin: 10.00 parts by mass Propylene glycol: 30.00 parts by mass Proxel GXL(S) (preservative): 0.05 parts by mass Olfine E1010 (manufactured by Nissin Chemical Industry Co., Ltd., surfactant): 0.10 parts by mass Ion-exchanged water: Remaining ------------------------------------------------------------------

[0173] A-2. Preparation and synthesis of the second resin The second resin can be prepared and synthesized by the following method.

[0174] (Silicone Acrylic 1) i) Preparation of an emulsion composition containing organopolysiloxane A solution of 555 g of hexamethylcyclotrisiloxane, 0.6 g of KBM-502 (γ-methacryloxypropylmethyldimethoxysilane), 44 g of KBM-13 (methyltrimethoxysilane), and 6 g of sodium lauryl sulfate in 54 g of ion-exchanged water, and a solution of 6 g of dodecylbenzenesulfonic acid in 54 g of pure water were uniformly emulsified in a homomixer, and then 430 g of ion-exchanged water was gradually added to dilute the mixture. The mixture was then heated under a pressure of 300 kgf / cm. 2 The mixture was passed through a high-pressure homogenizer twice at 100°C, yielding a uniform white emulsion. This emulsion was transferred to a 2 L glass flask equipped with a stirrer, thermometer, and reflux condenser, and subjected to polymerization at 60-70°C for 24 hours. After that, the mixture was neutralized with 12 g of a 10% aqueous sodium carbonate solution to a pH of 6-8, yielding a silicone emulsion composition. The non-volatile content of this silicone emulsion composition was 44.5%.

[0175] ii) Preparation of Silicone Acrylic 1 (Silicone Acrylic Graft Copolymer Resin) To the silicone emulsion composition obtained above, 3 g of methyl methacrylate (MMA) was added dropwise over 10 minutes. At 30°C, peroxide and a reducing agent were added to carry out an oxidation-reduction reaction, resulting in acrylic graft copolymerization. Through copolymerization, an emulsion composition containing Silicone Acrylic 1 (silicone acrylic graft copolymer resin) was obtained. The nonvolatile content of the emulsion composition was 44.8%. The mass ratio (hereinafter simply referred to as the "mass ratio of the organosiloxane structural units to the structural units derived from the methacrylic acid derivative in the second resin"), calculated by using the mass of the organosiloxane structural units per mole of the second resin as the numerator and the mass of the structural units derived from the (meth)acrylic acid derivative per mole of the second resin as the denominator, was 99.5 / 0.5. The average particle size of Silicone Acrylic 1 was 250 nm.

[0176] (Silicone Acrylic 2) i) Preparation of an emulsion composition containing organopolysiloxane A solution of 555 g of hexamethylcyclotrisiloxane, 0.6 g of KBM-502 (γ-methacryloxypropylmethyldimethoxysilane), 44 g of KBM-13 (methyltrimethoxysilane), and 6 g of sodium lauryl sulfate in 54 g of ion-exchanged water, and a solution of 6 g of dodecylbenzenesulfonic acid in 54 g of pure water were uniformly emulsified in a homomixer, and then 430 g of ion-exchanged water was gradually added to dilute the mixture. The mixture was then heated under a pressure of 300 kgf / cm. 2 The mixture was passed through a high-pressure homogenizer twice at 100°C, yielding a uniform white emulsion. This emulsion was transferred to a 2-L glass flask equipped with a stirrer, thermometer, and reflux condenser, and subjected to polymerization at 60°C to 70°C for 24 hours. After that, the mixture was neutralized with 12 g of a 10% aqueous sodium carbonate solution to a pH of 6 to 8, yielding a silicone emulsion composition. The nonvolatile content of this silicone emulsion composition was 44.5%.

[0177] ii) Preparation of Silicone Acrylic 2 (Silicone Acrylic Graft Copolymer Resin) To the silicone emulsion composition obtained above, 60 g of methyl methacrylate (MMA) was added dropwise over 3 hours, while a peroxide and a reducing agent were added at 30°C to carry out an oxidation-reduction reaction, resulting in acrylic graft copolymerization. Through copolymerization, an emulsion composition containing silicone acrylic 2 (silicone acrylic graft copolymer resin) was obtained. The nonvolatile content of the emulsion composition was 44.8%. The mass ratio of the organosiloxane structural units to the structural units derived from the methacrylic acid derivative in the second resin was 90.0 / 10.0. The average particle size of silicone acrylic 2 was 250 nm.

[0178] (Silicone Acrylic 3) As silicone acrylic 3, Silmer ACR D208 (manufactured by Siltech, molecular weight 3000, acrylic modified silicone prepolymer) was prepared.

[0179] (Silicone Acrylic 4) As silicone acrylic 4, KBM-5103 (manufactured by Shin-Etsu Silicones Co., Ltd., molecular weight 234, 3-acryloxypropyltrimethoxysilane) was prepared.

[0180] (Silicone Acrylic 5) i) Preparation of an emulsion composition containing organopolysiloxane A solution of 578 g of hexamethylcyclotrisiloxane, 0.6 g of KBM-502 (γ-methacryloxypropylmethyldimethoxysilane), 22 g of KBM-13 (methyltrimethoxysilane), and 6 g of sodium lauryl sulfate in 54 g of ion-exchanged water, and a solution of 6 g of dodecylbenzenesulfonic acid in 54 g of pure water were uniformly emulsified in a homomixer, and then 450 g of ion-exchanged water was gradually added to dilute the mixture. The mixture was then heated under a pressure of 300 kgf / cm. 2The mixture was passed through a high-pressure homogenizer twice at 100°C, yielding a uniform white emulsion. This emulsion was transferred to a 2 L glass flask equipped with a stirrer, thermometer, and reflux condenser, and polymerization reaction was carried out at 60-70°C for 24 hours. After that, the mixture was neutralized with 14 g of 10% aqueous sodium carbonate solution to a pH of 6-8, yielding a silicone emulsion composition. The non-volatile content of the silicone emulsion composition was 44.7%.

[0181] ii) Preparation of Silicone Acrylic 5 (Silicone Acrylic Graft Copolymer Resin) To the silicone emulsion composition obtained above, 225 g of methyl methacrylate (MMA) was added dropwise over 3 to 5 hours, while a peroxide and a reducing agent were added at 30°C to carry out an oxidation-reduction reaction, resulting in acrylic graft copolymerization. Through copolymerization, an emulsion composition containing Silicone Acrylic 5 (silicone acrylic graft copolymer resin) was obtained. The nonvolatile content of the emulsion composition was 44.8%. The mass ratio of the organosiloxane structural units to the structural units derived from the methacrylic acid derivative in the second resin was 70.0 / 30.0. The average particle size of Silicone Acrylic 5 was 250 nm.

[0182] (Silicone Acrylic 6) i) Preparation of an emulsion composition containing organopolysiloxane A solution of 605 g of hexamethylcyclotrisiloxane, 0.6 g of KBM-502 (γ-methacryloxypropylmethyldimethoxysilane), 45 g of KBM-13 (methyltrimethoxysilane), and 6 g of sodium lauryl sulfate in 54 g of ion-exchanged water, and a solution of 6 g of dodecylbenzenesulfonic acid in 54 g of purified water were uniformly emulsified in a homomixer, and then 450 g of ion-exchanged water was gradually added to dilute the mixture. The mixture was then heated under a pressure of 300 kgf / cm. 2The mixture was passed through a high-pressure homogenizer twice at 100°C, yielding a uniform white emulsion. This emulsion was transferred to a 2 L glass flask equipped with a stirrer, thermometer, and reflux condenser, and subjected to polymerization at 60-70°C for 24 hours. After that, the mixture was neutralized with 14 g of 10% aqueous sodium carbonate solution to a pH of 6-8, yielding a silicone emulsion composition. The non-volatile content of this silicone emulsion composition was 44.7%.

[0183] ii) Preparation of Silicone Acrylic 6 (Silicone Acrylic Graft Copolymer Resin) To the silicone emulsion composition obtained above, 15 g of methyl methacrylate (MMA) was added dropwise over 3 to 5 hours, while a peroxide and a reducing agent were added at 30°C to carry out an oxidation-reduction reaction, resulting in acrylic graft copolymerization. Through copolymerization, an emulsion composition containing silicone acrylic 6 (silicone acrylic graft copolymer resin) was obtained. The nonvolatile content of the emulsion composition was 44.8%. The mass ratio of the organosiloxane structural units to the structural units derived from the methacrylic acid derivative in the second resin was 98.0 / 2.0. The average particle size of silicone acrylic 6 was 250 nm.

[0184] The average particle size of the second resin is a value measured as a dispersed particle size (Z average) using a Zataizer Nano S90 manufactured by Melvern.

[0185] The Tg and weight-average molecular weight of silicone acrylics 1 to 6 are shown in Table 1. The Tg of the second resin is a value measured by differential scanning calorimetry in accordance with JIS K 7121:2012 at a temperature rise rate of 10°C / min. The weight-average molecular weight of the second resin is a value measured in terms of polystyrene by gel permeation chromatography.

[0186] A-3. Preparation of pigment ink A-3-1. Preparation of pigment dispersion To 20.0 parts by weight of magenta pigment, a pigment dispersant, Joncryl 819 (manufactured by BASF Japan Ltd.) was added at a loading of 30% by weight relative to the pigment, 20.0 parts by weight of propylene glycol (PG), 5.0 parts by weight of 1,2-hexanediol (1,2-HD), and ion-exchanged water to a total amount of 100.0 parts by weight, were added and mixed to obtain a pigment dispersion precursor. The resulting pigment dispersion precursor was an aqueous pigment dispersion with a pigment concentration of 20.0% by weight. The magenta pigment was Firstgen Super Magenta RY (CI Pigment Red 122, manufactured by Dainippon Ink and Chemicals, Inc.).

[0187] The pigment dispersion precursor was dispersed using a horizontal media disperser to prepare Pigment Dispersion 1 (average particle size: 120 nm) with a pigment concentration of 20.0% by mass. The volume-based average particle size of the pigment particles was measured using a particle size distribution analyzer (Zeta Nanosizer 1000HS, manufactured by Malvern Instruments). The horizontal media disperser was a Labostar Mini LMZ015 (zirconia bead diameter 0.3 mm, manufactured by Ashizawa Finetech Co., Ltd.).

[0188] A-3-2. Preparation of Ink No. 6 The amount of ion-exchanged water added was adjusted to a total of 100 parts by mass, and the following components were mixed to prepare ink No. 6. Note that the amounts of the pigment dispersion, first resin, and second resin added below include the amount of volatile matter (solvent). ------------------------------------------------------------------ Composition of Ink No. 6 ------------------------------------------------------------------ Pigment dispersion 1: 22.5 parts by mass First resin (urethane resin 1): 33.3 parts by mass Second resin (silicone acrylic 1): 2.22 parts by mass Glycerin: 10.0 parts by mass Propylene glycol: 16.5 parts by mass Proxel GXL(S) (preservative): 0.1 parts by mass Olfine E1010 (manufactured by Nissin Chemical Industry Co., Ltd., nonionic surfactant): 0.5 parts by mass TEGOWET 250 (manufactured by Evonik, nonionic surfactant): 0.1 parts by mass Ion-exchanged water: Remaining ------------------------------------------------------------------

[0189] A-3-3. Preparation of inks no. 7-10, 14-18, 22-24 Inks Nos. 7 to 10, 14 to 18, and 22 to 24 were prepared in the same manner, except that the type of first resin and the type and amount of second resin added were changed as shown in Table 1, and the amount of ion-exchanged water added was adjusted so that the total amount of each ink was 100 parts by mass.

[0190] A-4. Preparation of clear ink A-4-1. Preparation of Ink No. 1 The amount of ion-exchanged water added was adjusted to a total of 100 parts by mass, and the following components were mixed to prepare ink No. 1. Note that the amounts of the first and second resins added include the amount of volatile matter (solvent). ------------------------------------------------------------------ Ink No. 1 composition ------------------------------------------------------------------ First resin (urethane resin 1): 33.3 parts by mass Second resin (silicone acrylic resin 1): 2.22 parts by mass Glycerin: 10.0 parts by mass Propylene glycol: 20.0 parts by mass Proxel GXL(S) (preservative): 0.1 parts by mass Olfine E1010 (Nissin Chemical Industry Co., Ltd., nonionic surfactant): 0.1 parts by mass Ion-exchanged water: Remaining ------------------------------------------------------------------

[0191] A-4-2. Preparation of inks no. 2-5, 11-13, 19-21 Inks no. 2 to 5, 11 to 13, and 19 to 21 were prepared in the same manner, except that the type of first resin and the type and amount of second resin added were changed as shown in Table 1, and the amount of ion-exchanged water added was changed so that the total amount of each ink was 100 parts by mass.

[0192] The first resin used was as follows: Urethane resin 1: UW-1701F, manufactured by Ube Industries, Ltd. (Tg: 5°C, non-volatile content 30%, average particle size 50 nm) Urethane resin 2: Superflex 300, manufactured by Daiichi Kogyo Seiyaku Co., Ltd. (Tg: -42°C, non-volatile content 30%, average particle size 70 nm) Styrene acrylic resin: Movinyl 6751D, manufactured by Nippon Synthetic Chemical Industry Co., Ltd. (Tg: -32°C, non-volatile content: 50%, average particle size: 50 nm)

[0193] The Tg of the first resin is a value measured by differential scanning calorimetry in accordance with JIS K 7121: 2012 under measurement conditions of a temperature rise rate of 10°C / min. The average particle size of the first resin is a value measured as a dispersed particle size (Z average) using a Zataizer Nano S90 manufactured by Melvern.

[0194] B-1. Manufacturing of printed fabrics Cotton satin (100% cotton: product name 60 Cotton Satin, manufactured by Okadaya Co., Ltd.) was prepared as the fabric. The inkjet printing device used was a Konica Minolta Pro120 equipped with an inkjet head KM1024i (Konica Minolta, Inc.), a circulation channel, and a filter (filter: metal (SUS) mesh, opening diameter 10 μm) in the circulation channel. A head filled with the pretreatment liquid and a head filled with each ink were used. The inks were applied to the fabric by inkjet printing, followed by drying to obtain a printed fabric. The pretreatment liquid and each ink were ejected from the inkjet head at a main scanning speed of 540 dpi and a sub-scanning speed of 720 dpi. dpi refers to the number of ink droplets (dots) per 2.54 cm. The ejection frequency was 22.4 kHz. The substrate was then dried in a belt-transport dryer at 150°C for 3 minutes to obtain a 200mm x 200mm 100% solid printed image. The amount of the pretreatment liquid and each ink applied was 15g / m 2 and 15 g / m 2 These adhesion amounts were each determined from the amount of treatment liquid ejected.

[0195] B-2. Evaluation B-2-1. Evaluation of wet rubbing fastness The wet rub fastness of the image formed on the fabric was evaluated using a crock meter (rubbing tester type I) in accordance with the wet test of JIS L 0849:2013.

[0196] Specifically, a 100 mm × 100 mm area of ​​the formed image was rubbed back and forth 100 times with a white cotton cloth for rubbing under a load of 200 g. The white cotton cloth for rubbing was a white cotton cloth that had been wetted with water to a moisture content of approximately 100%. After rubbing, color transfer to the white cotton cloth for rubbing was observed, and the wet rubbing fastness was evaluated according to the following criteria (initial wet rubbing fastness). According to the following criteria, A and B were considered acceptable. Furthermore, the fabric on which the image was formed was left for one week in a constant temperature and humidity chamber at 25°C and 60% RH, and then the wet rubbing fastness was similarly evaluated (wet rubbing fastness after aging).

[0197] The evaluation of wet rub fastness was carried out only for images using inks Nos. 6 to 10, 14 to 18, and 22 to 24 containing pigment.

[0198] (Evaluation criteria) A: 4-5 grade ~ 5 grade B: 3-4 grade ~ 4 grade C: 2-3 grade ~ 3 grade

[0199] B-2-2. Discharge stability The prepared pigment ink was ejected using a fixed Konica Minolta KM1024iMHE printer at 25°C and 50% RH using a line method with a droplet volume of 13 pL. After confirming that the filled pigment ink was being ejected from all 60 nozzles at the start of ejection, the printer continued to eject the ink for 60 minutes. After the 60 minutes of continuous ejection, the number of nozzles that had been able to eject ink to the end (the number of nozzles ejecting ink after the 60 minutes of continuous ejection) was counted. The evaluation criteria were as follows. According to the following criteria, A to C were considered to be within the acceptable range.

[0200] Inks Nos. 1 to 5, 11 to 13, and 19 to 21 are overcoat inks that do not contain pigment, so a dye was dissolved in them to evaluate the ejection stability.

[0201] (Evaluation criteria) A: The number of nozzles after 60 minutes of continuous discharge is 60 B: The number of nozzles after 60 minutes of continuous discharge is 57 or more but less than 60 C: The number of nozzles discharging after 60 minutes of continuous discharging is 55 or more but less than 57 D: The number of nozzles discharging after 60 minutes of continuous discharging is 53 or more but less than 55 E: The number of nozzles after 60 minutes of continuous discharge is less than 53

[0202] B-2-3. Texture The texture of the obtained image-formed product and fabric was evaluated sensorily by touching with the fingers. The evaluation was based on the following criteria. A and B were considered to be within the acceptable range.

[0203] (Evaluation criteria) A: The original softness of the fabric is maintained, and it is almost the same as before the image formation. B: It is slightly stiffer than before image formation, but the texture of the fabric is not impaired and there is no problem in practical use. C: The paper is harder than before image formation, the texture of the fabric is damaged, and it is at a level that is problematic for practical use.

[0204] B-2-4. Evaluation Results The evaluation results of inks no. 1 to 24 are shown in Table 1.

[0205] [Table 1]

[0206] In the table, "-" in the Tg column indicates that Tg was not observed. The content of the second resin indicates the content ratio (mass %) of the solid content of the second resin to the total mass of the ink.

[0207] As shown in Table 1, when inks no. 11 to 24 (Examples) are compared with inks no. 1 to 10 (Comparative Examples), it can be seen that inks no. 11 to 24 have high ejection stability and tend to maintain the texture of the resulting printed fabric. [Industrial Applicability]

[0208] According to the present invention, it is possible to provide a method for producing a printed fabric, an inkjet printing apparatus, and an ink that can improve ejection stability while maintaining the texture of the fabric. [Explanation of symbols]

[0209] 1 Head Chip 8 Ink circulation section 11 Nozzle board 12. Channel spacer substrate 13 Pressure chamber substrate 51 Common ink chamber 81 Supply sub-tank 82 Circulation sub-tank 85, 86 Flow path 87 Circulation flow path 88, 89 Pumps 90 Filter Unit 100 Inkjet head 200 Inkjet printing device 210 Conveying equipment 211 Conveyor Belt 212 Feed roller 213a, 213b pulley 214 Belt 220 Ink supply device 230 Main Tank 240 Fabric 251, 252 flow path 253 Bypass flow path 254 Valve

Claims

1. an inkjet head that ejects ink from nozzles; an ink tank for storing the ink; a circulation flow path that communicates the ink tank with the inkjet head and constitutes a flow path through which the ink circulates; A method for producing a printed fabric using an inkjet printing apparatus having the following features: The method includes a step of ejecting the ink from the inkjet head and applying the ink to a fabric, the ink contains water, a water-soluble organic solvent, a first resin, and a second resin; the first resin is a water-dispersible resin having a glass transition temperature of −30° C. or lower, the second resin is a silicone acrylic resin having a glass transition temperature of 80°C or higher, The weight average molecular weight of the second resin is 10,000 to 100,000. A method for manufacturing printed fabrics.

2. The water-dispersible resin is a water-dispersible urethane resin. A method for producing the printed fabric according to claim 1.

3. The ink contains a pigment. A method for producing the printed fabric according to claim 1.

4. the content of the second resin is 0.2% by mass to 10.0% by mass relative to the total mass of the ink; A method for producing the printed fabric according to claim 1.

5. the second resin contains an organosiloxane structural unit and a structural unit derived from a (meth)acrylic acid derivative, a mass ratio, where the mass of the organosiloxane structural unit per mole of the second resin is used as the numerator and the mass of the structural unit derived from the (meth)acrylic acid derivative per mole of the second resin is used as the denominator, is 80.0 / 20.0 to 97.0 / 3.0; A method for producing the printed fabric according to claim 1.

6. An inkjet printing apparatus used in the method for producing a printed fabric according to any one of claims 1 to 5, an inkjet head that ejects ink droplets from nozzles; an ink tank for storing the ink; a circulation flow path that communicates the ink tank with the inkjet head and constitutes a flow path through which ink circulates; having Inkjet printing equipment.

7. An ink for inkjet textile printing, A composition comprising water, a water-soluble organic solvent, a first resin, and a second resin, the first resin is a water-dispersible resin having a glass transition temperature of −30° C. or lower, the second resin is a silicone acrylic resin having a glass transition temperature of 80°C or higher, The weight average molecular weight of the second resin is 10,000 to 100,000. ink.

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