Penetrant for inkjet printing and inkjet recording method

Abstract

To provide penetrant for inkjet printing by which an image having excellent color development can be obtained not only on a surface but also on a rear face.SOLUTION: Penetrant for inkjet printing contains a lactam compound having hydroxy group and glycols having the vapor pressure of 1.0 Pa to 20.0 Pa at 20°C, where the content of the lactam compound is 15 mass% to 25 mass% for the total amount of the composition, and the content of the glycols is 0.8 to 3.0 in a mass ratio for the total amount of the lactam compound.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a penetration liquid for inkjet printing and an inkjet recording method.

Background Art

[0002] The inkjet recording method uses a relatively simple device and can record high-definition images, and has been rapidly developing in various fields. Among them, various studies have been conducted on printing methods using the inkjet method. For example, Patent Document 1 discloses a penetration liquid for inkjet printing that contains a lactam compound and water, and the content of the lactam compound is 20% by mass or more.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, in inkjet printing, it has been required to penetrate ink to the back surface of the fabric and obtain a good-color image not only on the front surface but also on the back surface. The penetration liquid described in Cited Document 1 has room for improvement in this regard.

Means for Solving the Problems

[0005] The inventors of the present invention have intensively studied to solve the above problems. As a result, they have found that the above problems can be solved by using a penetration liquid having a predetermined composition, and have completed the present invention.

[0006] That is, the present invention is as follows. The inkjet printing penetrant of the present invention comprises a lactam compound having a hydroxyl group and glycols having a vapor pressure of 1.0 Pa to 20.0 Pa at 20°C, wherein the content of the lactam compound is 15% to 25% by mass of the total amount of the composition, and the content of the glycols is 0.8 to 3.0 by mass relative to the total amount of the lactam compound.

[0007] The inkjet recording method of the present invention includes an ink application step of applying an aqueous dye ink containing a reactive dye, an acid dye, or a disperse dye to a fabric by an inkjet method, and a penetrant application step of applying the inkjet printing penetrant of the present invention to the fabric by an inkjet method. [Brief explanation of the drawing]

[0008] [Figure 1] This table shows the results of the examples. [Figure 2] This table shows the results of the examples. [Figure 3] This table shows the results of the examples. [Figure 4] This table shows the results of the examples. [Modes for carrying out the invention]

[0009] The following describes in detail an embodiment of the present invention (hereinafter referred to as "this embodiment"), but the present invention is not limited thereto, and various modifications are possible without departing from its essence.

[0010] 1. Penetrant for inkjet printing The inkjet printing penetrant of this embodiment contains a lactam compound having a hydroxyl group and glycols having a vapor pressure of 1.0 Pa to 20.0 Pa at 20°C, wherein the lactam compound content is 15% to 25% by mass of the total amount of the composition, and the glycol content is 0.8 to 3.0 by mass relative to the total amount of the lactam compound.

[0011] The inkjet printing penetrant of this embodiment contains a lactam compound having a hydroxyl group with excellent water solubility and glycols having a predetermined vapor pressure in the above-mentioned content and mass ratio, thereby exhibiting excellent penetration of acid dyes, reactive dyes, and disperse dyes. As a result, regardless of whether acid dyes, reactive dyes, or disperse dyes are used, it is possible to obtain a record with little difference in dye density between the front and back of the fabric and excellent color development. In other words, the inkjet printing penetrant of this embodiment can be used for both cotton printing using acid dyes or reactive dyes, and polyester fiber printing using disperse dyes.

[0012] Furthermore, while conventionally used penetrants containing lactam compounds such as 2-pyrrolidone have some effect in improving the penetration of acid dyes and reactive dyes, they have a problem with disperse dyes because 2-pyrrolidone dissolves the disperse dye, often leading to poor dyeing. For this reason, 1,3-propylene glycol and 1,4-butanediol are used in penetrants for disperse dyes, but their penetrant power is poor, and they do not contribute much to improving the penetration of acid dyes and reactive dyes.

[0013] Therefore, conventionally, it was necessary to use different penetrants for acid dyes, reactive dyes, and disperse dyes. However, with the increasing use of cotton / polyester blends as functional fabrics in recent years, it has become necessary to print with both reactive and disperse dyes simultaneously, thus creating a demand for a penetrant that can be used with acid dyes, reactive dyes, and disperse dyes.

[0014] In contrast, the inkjet printing penetrant of this embodiment contains a lactam compound having a hydroxyl group with excellent water solubility and glycols having a predetermined vapor pressure in the above-mentioned content and mass ratio, thereby improving penetration to each dye while suppressing dyeing inhibition and dissolution of disperse dyes. Therefore, it can be used not only for printing with acid dyes or reactive dyes, but also for printing with disperse dyes.

[0015] 1.1. Lactam compounds having a hydroxyl group The penetrant for inkjet printing of this embodiment contains a lactam compound having a hydroxy group. The lactam compound having a hydroxy group is not particularly limited. For example, one or more selected from the group consisting of 1-(2-hydroxyethyl)-2-pyrrolidone, 1-(2-hydroxyethyl)-3-methyl-2-pyrrolidone, 4-hydroxy-2-pyrrolidone, and 6-hydroxymethyl-2-piperidone are preferable, and 1-(2-hydroxyethyl)-2-pyrrolidone is more preferable. By using such a lactam compound, regardless of whether an acid dye, a reactive dye, or a disperse dye is used, the permeability can be improved while maintaining the coloring property, and a printed matter with a small difference in dyeing density between the front and back can be obtained with good color development property.

[0016] The content of the lactam compound having a hydroxy group is 15% by mass to 25% by mass, preferably 18% by mass to 23% by mass, based on the total amount of the composition. When the content of the lactam compound having a hydroxy group is 15% by mass or more, the permeability is excellent, so a printed matter with a small difference in dyeing density between the front and back can be obtained with good color development property. Further, when the content of the lactam compound having a hydroxy group is 25% by mass or less, the inhibition of dyeing due to the reaction of the lactam compound having a hydroxy group with the reactive dye can be suppressed, so a printed matter with a small difference in dyeing density between the front and back can be obtained with good color development property.

[0017] 1.2. Glycols The penetrant for inkjet printing of this embodiment contains glycols having a vapor pressure of 1.0 Pa to 20.0 Pa at 20°C. The above glycols may be included as an organic solvent. The above glycols may be used alone or in combination of two or more. [[ID=I7]] Since the vapor pressure of the above glycols at 20°C is 1.0 Pa or more, they are relatively volatile, so the inhibition of dyeing of acid dyes and reactive dyes is suppressed. Further, it is possible to prevent the glycols from penetrating too much and the above lactam compound from remaining on the surface side. The glycols have excellent permeability because their vapor pressure at 20 °C is 20.0 Pa or less. The vapor pressure of the glycols at 20 °C is preferably 3.0 Pa to 18.0 Pa, 5.0 Pa to 16.5 Pa, 6.5 Pa to 15.0 Pa, or 8.0 Pa to 13.5 Pa.

[0018] Examples of the glycols include ethylene glycol (vp: 7.0 Pa), propylene glycol (vp: 10.6), 1,3-butanediol (vp: 8.0), 2,3-butanediol (vp: 12.0), 2-methyl-2,4-pentanediol (vp: 6.7), methanediol (vp: 16.1), etc. Here, vp means the vapor pressure at 20 °C. The glycols preferably contain propylene glycol. By using such glycols, regardless of whether acid dyes, reactive dyes, or disperse dyes are used, the permeability can be improved while maintaining the coloring property, and a printed matter with a small difference in dyeing density between the front and back can be obtained with good color development.

[0019] The content of the glycols is 0.8 to 3.0, preferably 0.9 to 2.5, 0.9 to 2.0, or 0.9 to 1.5 in terms of mass ratio with respect to the total amount of the lactam compound. When the content of the glycols is 0.8 or more in terms of mass ratio with respect to the total amount of the lactam compound, the permeability to the back surface of fabrics and the like is excellent. Also, when using the inkjet printing penetration liquid of the present embodiment together with reactive dyes, dyeing inhibition can be suppressed. When the content of the glycols is 3.0 or less in terms of mass ratio with respect to the total amount of the lactam compound, it is possible to prevent the penetration power of the lactam compound having a hydroxy group from becoming excessive. As a result, it is possible to prevent the disperse dye from not penetrating and remaining mostly on the surface side.

[0020] The glycol content is preferably 15% to 60% by mass, 20% to 50% by mass, 20% to 40% by mass, or 20% to 30% by mass, relative to the total amount of the composition. By having the glycol content within the above range, regardless of whether an acid dye, reactive dye, or disperse dye is used, it is possible to improve penetration while maintaining colorability, and to obtain printed materials with good color development and little difference in dye density between the front and back sides.

[0021] 1.3.Water Examples of suitable water include pure water such as ion-exchanged water, ultrafiltered water, reverse osmosis water, and distilled water, as well as water from which ionic impurities have been removed as much as possible, such as ultrapure water. Furthermore, using water sterilized by ultraviolet irradiation or the addition of hydrogen peroxide can prevent the growth of mold and bacteria when inkjet printing penetrants are stored for long periods.

[0022] The water content is preferably 30 to 80% by mass, more preferably 35 to 75% by mass, and even more preferably 40 to 70% by mass, based on 100% by mass of the inkjet printing penetrant.

[0023] 1.4. Surfactants The inkjet printing penetrant may further contain a surfactant. The surfactant is not particularly limited, but examples include nonionic surfactants, cationic surfactants, and anionic surfactants. Among these, nonionic surfactants are preferred. Using a nonionic surfactant tends to further improve discharge stability.

[0024] Nonionic surfactants are not particularly limited, but examples include silicone surfactants, acetylene glycol surfactants, polyoxyethylene alkyl ether surfactants, polyoxypropylene alkyl ether surfactants, polycyclic phenyl ether surfactants, sorbitan derivative surfactants, and fluorine surfactants. Among these, acetylene glycol surfactants are preferred. Using acetylene glycol surfactants tends to further improve permeability.

[0025] The acetylene glycol-based surfactant is not particularly limited, but preferably one or more selected from 2,4,7,9-tetramethyl-5-decine-4,7-diol and its alkylene oxide adduct, and 2,4-dimethyl-5-decine-4-ol and its alkylene oxide adduct. Commercially available acetylene glycol-based surfactants are not particularly limited, but examples include the E series such as Olfin PD002W, Olfin 104 series, and Olfin E1010 (product names of Nissin Chemical Industry Co., Ltd.), and Surfinol 465 and Surfinol 61 (product names of Air Products Japan, Inc.). The surfactant may be used alone or in combination of two or more.

[0026] The surfactant content is preferably 0.10 to 1.0% by mass, more preferably 0.20 to 0.75% by mass, and even more preferably 0.30 to 0.60% by mass, based on 100% by mass of the inkjet printing penetrant. A surfactant content of 0.10% by mass or more tends to improve penetrant properties. Furthermore, a surfactant content of 1.0% by mass or less tends to suppress a decrease in discharge stability.

[0027] 1.5. Other ingredients The inkjet printing penetrant may further contain ureas, sugars, pH adjusters, chelating agents, preservatives, rust inhibitors, and other components.

[0028] The inkjet penetrant is preferably not an ink composition and does not contain colorants. Specifically, from the viewpoint of clearly distinguishing the inkjet penetrant from an ink composition, the colorant content is preferably 0.1% by mass or less, more preferably 0.01% by mass or less, and particularly preferably 0% by mass, relative to the total amount of the inkjet penetrant. By setting the content to such a level, unintended discoloration of the area to which the penetrant is applied can be prevented.

[0029] Inkjet penetrants are preferably ink compositions that do not contain solid components such as resin particles. Specifically, from the viewpoint of clearly distinguishing inkjet penetrants from ink compositions, the solid component content is preferably 1.0% by mass or less, 0.1% by mass or less, more preferably 0.01% by mass or less, and 0% by mass, relative to the total amount of the inkjet penetrant. In this specification, components that are solid at room temperature but soluble in water (such as urea and DMI (1,3-dimethyl-2-imidazolidinone)) are not included in the solid component.

[0030] 2. Inkjet recording method Next, an inkjet recording method using the inkjet printing penetrant of this embodiment will be described. The inkjet recording method includes an ink application step of applying an aqueous dye ink containing a reactive dye, an acid dye, or a disperse dye to a fabric by an inkjet method, and a penetrant application step of applying the inkjet printing penetrant of this embodiment to a fabric by an inkjet method.

[0031] In some cases, a record (which may also be a printed object) is required that has the same record applied to both the front and back surfaces of a piece of fabric. One method for obtaining such a record is to apply a penetrating agent to the fabric before and after applying the ink composition to the fabric, thereby inducing the penetration of the ink composition. However, depending on the composition of the penetrating agent, dyeing inhibition (difficulty in dyeing the fabric) may occur, or differences in color development may occur on the front and back surfaces of the printed object due to the penetrating solution drying before penetration, or differences in color development may occur on the front and back surfaces of the printed object due to the penetrating solution not drying easily.

[0032] In contrast, in this embodiment, by using a penetrant of a predetermined composition, it is possible to obtain an imprint that is less prone to staining inhibition and has reduced differences in color development between the front and back surfaces. This will be explained in detail below.

[0033] 2.1. Ink application process The ink application process involves applying a water-based dye ink containing reactive dyes, acid dyes, or disperse dyes to a fabric using an inkjet method. Inkjet methods are not particularly limited, but examples include charge deflection methods, continuous methods, and on-demand methods (piezo type, bubble jet® type).

[0034] The inkjet recording method of this embodiment may include an ink attachment step comprising a reaction / acid ink attachment step in which a first aqueous dye ink containing a reaction dye or an acid dye is attached to the fabric by an inkjet method, and a dispersion ink attachment step in which a second aqueous dye ink containing a disperse dye is attached to the fabric by an inkjet method. As described above, the inkjet printing penetrant of this embodiment can be used not only for printing with acid dyes or reactive dyes, but also for printing with disperse dyes. Therefore, it is not necessary to prepare separate penetrants for acid dyes or reactive dyes and disperse dyes. Furthermore, the inkjet recording method of this embodiment is not limited to a method in which the ink attachment step includes a reaction / acid ink attachment step in which a first aqueous dye ink is attached to the fabric by an inkjet method, and a dispersion ink attachment step in which a second aqueous dye ink is attached to the fabric by an inkjet method, but may also include only one of the reaction / acid ink attachment step or the dispersion ink attachment step.

[0035] 2.1.1. Ink Composition The ink composition may contain dyes, solvents, surfactants, ureas, sugars, pH adjusters, chelating agents, preservatives, rust inhibitors, and other components.

[0036] The dyes are not particularly limited, but examples include acid dyes such as CI Acid Yellow, CI Acid Red, CI Acid Blue, CI Acid Orange, CI Acid Violet, and CI Acid Black; basic dyes such as CI Basic Yellow, CI Basic Red, CI Basic Blue, CI Basic Orange, CI Basic Violet, and CI Basic Black; direct dyes such as CI Direct Yellow, CI Direct Red, CI Direct Blue, CI Direct Orange, CI Direct Violet, and CI Direct Black; reactive dyes such as CI Reactive Yellow, CI Reactive Red, CI Reactive Blue, CI Reactive Orange, CI Reactive Violet, and CI Reactive Black; and disperse dyes such as CI Disperse Yellow, CI Disperse Red, CI Disperse Blue, CI Disperse Orange, CI Disperse Violet, and CI Disperse Black. The above dyes may be used individually or in combination of two or more. Commercially available dyes may be used. Examples include Genesta® RE-N Black (reactive dye) and Genesta DS Black (disperse dye).

[0037] 2.1.2.Fabric The fibers that make up the fabric are not particularly limited, but examples include natural fibers such as silk, cotton, linen, and wool; synthetic fibers such as polyester fibers, nylon fibers, triacetate fibers, diacetate fibers, and polyamide fibers; and regenerated fibers such as rayon. The fabric may consist of one type of fiber or a blend of two or more types of fibers. Among these, blended fabrics made by blending fibers with different permeability are particularly suitable for use as fabrics. Traditionally, for example, disperse dyes were often used for polyester fibers, and reactive dyes were often used for cellulose-based fibers (such as cotton). Furthermore, different penetrating solutions were required for acid dyes or reactive dyes and disperse dyes. In contrast, the inkjet printing penetrant of this embodiment can be used not only for printing with acid dyes or reactive dyes, but also for printing with disperse dyes. Therefore, the inkjet printing penetrant of this embodiment can be used effectively even on blended fabrics made by mixing different fibers. The fabric can be any form of textile, such as woven, knitted, or nonwoven, using the fibers listed above.

[0038] The combinations of fabrics and dyes are not particularly limited, but examples include reactive dyes with cellulose-based fibers (cotton, linen, rayon, etc.), acid dyes with silk, wool, and nylon fibers, basic dyes with acrylic fibers, direct dyes with cotton, linen, and rayon, and disperse dyes with polyester fibers. Among these, reactive dyes with cellulose-based fibers and acid dyes with silk, wool, and nylon fibers are preferred. By using such combinations, the difference in color development between the front and back surfaces of the printed material tends to be further suppressed. However, the combinations of fabrics and dyes are not limited to these.

[0039] 2.2. Penetrating liquid adhesion process The penetrant application step is a process of applying the inkjet printing penetrant of this embodiment to the fabric using an inkjet method. The means for applying the penetrant are not particularly limited, but examples include a roller method, a spray method, and an inkjet method. Among these, the inkjet method is preferred from the viewpoint of being able to selectively apply the penetrant.

[0040] The penetrant application process may be performed after the ink application process, before the ink application process, or simultaneously with the ink application process. When the penetrant application process is performed before the ink application process, it is preferable to perform the ink application process before the penetrant applied to the fabric dries. Furthermore, when the penetrant application process is performed after the ink application process, it can be performed before or after the ink composition applied to the fabric dries, and it is preferable to perform the penetrant application process before the ink composition applied to the fabric dries. The penetrant may be applied to the surface of the fabric, the back surface, or both surfaces.

[0041] 2.3.Heating process The inkjet recording method of this embodiment may further include a heating step in which the fabric is heated after the ink application step and the penetrant application step. By including a heating step, the dye can be more effectively dyed to the fibers constituting the fabric. The heating method is not particularly limited, but examples include the HT method (high temperature steaming method), the HP method (high pressure steaming method), and the thermosol method.

[0042] Furthermore, in the heating process, the surface on the fabric to which the ink composition is attached may or may not be subjected to pressure treatment. An example of a heating method that does not involve pressurizing the surface on the fabric to which the ink composition is attached is oven drying (a non-pressure method such as a conveyor oven or batch oven). Having such a heating process further improves the productivity of the recorded material. There are no particular limitations on heating methods that also involve pressurizing the surface on the fabric to which the ink composition is attached, but examples include heat pressing and wet-on-drying. Note that "pressurization" refers to applying pressure to the recording medium by bringing a solid into contact with it.

[0043] The temperature during heat treatment is preferably 50°C to 150°C, and more preferably 60°C to 110°C. A temperature within this range tends to allow for better dye adhesion to the fibers constituting the fabric.

[0044] 2.4. Washing Process The inkjet recording method of this embodiment may further include a washing step to wash the fabric after the heating step. The washing step can effectively remove dyes that have not adhered to the fibers. The washing step can be carried out using water, for example, and soaping may be performed as needed. The soaping method is not particularly limited, but examples include washing off unadhered pigments with a hot soapy solution. [Examples]

[0045] The present invention will be described more specifically below using examples and comparative examples. The present invention is not limited in any way by the following examples.

[0046] [ink] The inks used in the following examples and comparative examples are as follows: Genesta RE-N Black (reactive dye ink) Genesta DS Black (disperse dye ink)

[0047] [Materials for inkjet printing penetrants] The main materials used in the inkjet printing penetrants in the following examples and comparative examples are as follows: [Lactam compounds] 1-(2-hydroxyethyl)-2-pyrrolidone 1-(2-hydroxyethyl)-3-methyl-2-pyrrolidone 4-Hydroxy-2-pyrrolidone 6-Hydroxymethyl-2-piperidone 2-Pyrrolidone

[0048] [Glycols] Propylene glycol (vp: 10.6 Pa) Ethylene glycol (VP: 7 Pa) 1,3-Butanediol (vp:8Pa) 2,3-Butanediol (vp:12Pa) Diethylene glycol (VP: <0.8 Pa) 2-Methyl-2,4-pentanediol (vp: 6.7 Pa) Methanediol (vp: 16.1 Pa)

[0049] [Alcohols other than glycols] 2-Ethyl-1-hexanol (vp: 48 Pa)

[0050] [pH adjuster] Triisopropanolamine Triethanolamine [Surfactants] Olphine PD002W (acetylene glycol-based surfactant, manufactured by Nisshin Chemical Industry Co., Ltd.) [Preservatives] Proxel XL-2 (manufactured by Arcsarda Japan Co., Ltd.)

[0051] [Preparation of penetrant for inkjet printing] Each material was mixed in the composition shown in Figures 1 to 4 below, and thoroughly stirred to obtain each inkjet printing penetrant. In Figures 1 to 4 below, the unit of the numerical values ​​is mass%, and the total is 100.0 mass%.

[0052] <Experiment 1-A> (Sample 1) 1) The above Genesta RE-N Black (reactive dye ink) and penetrant were filled into the cartridge of an inkjet printer SurePress FP-30160 (manufactured by Seiko Epson Corporation). Fabric 1 (cotton, COT-PTR (manufactured by Epson Como Printing Technologies Srl.)) was loaded into the printer, and solid printing was performed in 900 x 600 dpi mode, resulting in a density of 2.3 mg / cm². 2 ~2.5 mg / cm³ 2 The ink and penetrant were applied to the surface of fabric 1 to achieve the desired result. 2) After printing, the prints were pre-dried with a 60°C hot air heater, left for one day, and then the following steam and cleaning treatments were performed. ~Steam and cleaning treatment~ Steaming was performed at 102°C for 12 minutes, followed by washing with cold water for 10 minutes. Then, a hot water dyeing treatment was performed for 6 minutes using 90°C water with 2g / L of Laccol A (manufactured by Meisei Chemical Co., Ltd.) added to the washing water, followed by rinsing with water for 10 minutes. 3) The fabric was dried using a hot air dryer to obtain the printing cloth for Sample 1.

[0053] [Dyeability and Penetration] The OD values ​​(color intensity) of the front and back surfaces of the obtained printing cloth were measured using a Konica Minolta FD-7 fluorescence spectrometer (field of view = 10 degrees, light source = D65, with UV cut filter), and the respective OD values ​​(front surface) and the ΔEcmc (2:1) of the front and back surfaces were determined. For stain adhesion evaluation, the OD value (surface) was evaluated based on the following evaluation criteria. For permeability evaluation, the ΔEcmc(2:1) values ​​for the front and back surfaces were evaluated based on the following evaluation criteria. (Evaluation Criteria) A: The OD value (surface) was 1.6 or higher. B: The OD value (surface) was between 1.5 and 1.6. The C:OD value (surface) was between 1.4 and 1.5. D: The OD value (surface) was less than 1.4. (Evaluation Criteria) A:ΔEcmc(2:1) was less than or equal to 1.0. B:ΔEcmc(2:1) was greater than 1.0 and less than or equal to 1.5. The ratio C:ΔEcmc(2:1) was greater than 1.5 and less than or equal to 2.0. D:ΔEcmc(2:1) was greater than 2.0.

[0054] <Experiment 1-B> (Sample 2) I changed Genesta RE-N Black (reactive dye ink) to Genesta DS Black (disperse dye ink). Fabric 1 (cotton, COT-PTR) was changed to Fabric 2 (polyester, PES-PT (manufactured by Epson Como Printing Technologies Srl.)), The printing cloth for Sample 2 in Experiment 1-B was obtained in the same manner as described in the method for (Sample 1) in Experiment 1-A, except that the steam and cleaning treatments were changed to the steam and cleaning treatments described below. ~Steam and cleaning treatment~ Steaming was performed at 170°C for 8 minutes, followed by washing with cold water for 10 minutes. Then, 2g / L of Laccol A (manufactured by Meisei Chemical Co., Ltd.) was added to the washing water as a detergent, and at the same time, 2g / L each of hydrosulfite and sodium hydroxide were added to 85°C water for a hot water dyeing treatment for 6 minutes, followed by rinsing with water for 10 minutes.

[0055] [Dyeability and Penetration] For Sample 2, the OD value (surface) and front-to-back ΔEcmc (2:1) were determined using the same method as described in [Stainability and Penetration] in <Experiment 1-A>. For stain adhesion evaluation, the OD value (surface) was evaluated based on the following evaluation criteria. For permeability evaluation, the ΔEcmc(2:1) values ​​of the front and back surfaces were evaluated based on the same evaluation criteria as those described in [Stainability and Permeability] in <Experiment 1-A>. (Evaluation Criteria) A: The OD value (surface) was 1.5 or higher. B: The OD value (surface) was between 1.4 and 1.5. The C:OD value (surface) was between 1.3 and 1.4. D: The OD value (surface) was less than 1.3. E: It didn't stain at all.

[0056] As shown in Figures 1 to 3, the example using an inkjet penetrant containing a lactam compound having a hydroxyl group and glycols with a vapor pressure of 1.0 Pa to 20.0 Pa at 20°C, wherein the lactam compound content is 15% to 25% by mass of the total amount of the composition, and the glycol content is 0.8 to 3.0 by mass relative to the total amount of the lactam compound, showed excellent evaluation of dyeability and penetrant properties in Experiments 1-A and 1-B. Therefore, the example allowed the ink to penetrate to the back of the fabric, and good color development images were obtained not only on the front but also on the back. On the other hand, Comparative Example 1, which did not contain glycols and had a vapor pressure of 1.0 Pa to 20.0 Pa at 20°C, exhibited poor dyeing properties. Comparative Examples 3 and 4, which contained lactam compounds without hydroxyl groups, exhibited poor dyeing properties when disperse dye inks were used. Comparative Example 8, in which the glycol content was less than 0.8 by mass ratio relative to the total amount of lactam compounds, exhibited poor dyeing properties with reactive dye inks. Comparative Example 10, in which the above mass ratio was greater than 3.0, exhibited poor permeability.

[0057] <Experiment 2> (Sample 3) 1) Fabric 3 (T40, polyester 65 + cotton 35 broadcloth fabric manufactured by Nisshinbo Holdings Inc.) was coated with the reaction ink pretreatment solution described below using a mangle at a pickup rate of 30%, and then dried to prepare a fabric for printing. (Composition of pretreatment solution for reactive inks) Sodium alginate 1% by mass Guar gum 1% by mass Ammonium sulfate 4% by mass Urea 10% by mass Water 84% by mass 2) The above-mentioned Genesta RE-N Black (reactive dye ink), Genesta DS Black (disperse dye ink), and penetrant were filled into cartridges of the SurePress FP-30160 inkjet printer (manufactured by Seiko Epson Corporation). At that time, Genesta RE-N Black (reactive dye ink) was loaded into the Black column of the SurePress FP-30160 inkjet printer (manufactured by Seiko Epson Corporation), and Genesta DS Black (disperse dye ink) was loaded into the Orange column. 3) Disperse dye ink: The application ratio of reactive dye ink was adjusted to approximately 65:35, and solid printing was performed in 900 x 600 dpi mode, resulting in a density of 2.3 mg / cm². 2 ~2.5 mg / cm³ 2 The ink and penetrant were applied to the surface of the printing cloth to achieve the desired result. 2) After printing, the prints were pre-dried with a 60°C hot air heater, left for one day, and then the following steam and cleaning treatments were performed. ~Steam and cleaning treatment~ Steaming was performed at 170°C for 8 minutes, followed by washing with cold water for 10 minutes. Then, 2 g / L of Laccol A (manufactured by Meisei Chemical Co., Ltd.) was added to the washing water as a detergent, and at the same time, 1 g / L each of hydrosulfite and sodium hydroxide was added to 85°C water for 6 minutes of hot water dyeing, followed by 10 minutes of rinsing with water. 3) The fabric was dried using a hot air dryer to obtain the printing cloth for sample 3.

[0058] [Dyeability and Penetration] For Sample 3, the OD value (surface) and front-to-back ΔEcmc (2:1) were determined using the same method as described in [Stainability and Penetration] in <Experiment 1-A>. For staining evaluation, the OD value (surface) was evaluated based on the same evaluation criteria as those described in [Staining and Penetration] in <Experiment 1-B>. For permeability evaluation, the ΔEcmc(2:1) values ​​of the front and back surfaces were evaluated based on the same evaluation criteria as those described in [Stainability and Permeability] in <Experiment 1-A>.

[0059] As shown in Figure 4, the example using the inkjet printing penetrant of this embodiment showed excellent dyeability and penetration in Experiment 2. Therefore, even when using a polyester-cotton blend fabric, the example allowed the ink to penetrate to the back of the fabric, resulting in a well-colored image not only on the front but also on the back. On the other hand, Comparative Example 1, which did not contain glycols and had a vapor pressure of 1.0 Pa to 20.0 Pa at 20°C, showed poor staining properties. Comparative Examples 3 and 4, which contained lactam compounds without hydroxyl groups, showed poor staining and penetration properties.

Claims

1. It comprises a lactam compound having a hydroxyl group and glycols having a vapor pressure of 1.0 Pa to 20.0 Pa at 20°C. The content of the lactam compound is 15% to 25% by mass relative to the total amount of the composition. An inkjet printing penetrant wherein the content of the glycols is 0.8 to 3.0 by mass relative to the total amount of the lactam compound.

2. The inkjet printing penetrant according to claim 1, wherein the content of the glycols is 20% by mass to 50% by mass based on the total amount of the composition.

3. The inkjet penetrant according to claim 1, wherein the lactam compound comprises one or more selected from the group consisting of 1-(2-hydroxyethyl)-2-pyrrolidone, 1-(2-hydroxyethyl)-3-methyl-2-pyrrolidone, 4-hydroxy-2-pyrrolidone, and 6-hydroxymethyl-2-piperidone.

4. The inkjet printing penetrant according to claim 1, wherein the glycols include propylene glycol.

5. The inkjet printing penetrant according to claim 1, wherein the colorant content is 0.1% by mass or less.

6. The inkjet printing penetrant according to claim 1, wherein the solid content is 1.0% by mass or less.

7. An ink application process in which an aqueous dye ink containing a reactive dye, acid dye, or disperse dye is applied to a fabric by an inkjet method, The invention includes a penetrant application step of applying an inkjet penetrant according to any one of claims 1 to 6 to the fabric by an inkjet method, Inkjet recording method.

8. The aforementioned ink application process, A reaction / acid ink application step in which a first aqueous dye ink containing a reactive dye or acid dye is applied to the fabric by an inkjet method, The process includes a dispersion ink application step in which a second aqueous dye ink containing a disperse dye is applied to the fabric by an inkjet method, The inkjet recording method according to claim 7.

9. The inkjet recording method according to claim 7, wherein the fabric is a blended fabric.

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