Inkjet printing ink composition, recording method, and recording material

Abstract

To provide an ink composition for inkjet textile printing which hardly causes clogging at the inkjet nozzle, can improve re-solubility of a solid content even if the solid content of the ink composition for inkjet textile printing precipitates, has excellent discharge reliability by an inkjet method and can be used for producing a recorded matter having excellent wet fastness properties.SOLUTION: There is provided an ink composition for inkjet textile printing which comprises an acid dye having solubility in water at 20°C of 30 g / L or less, a water-soluble organic solvent and water, wherein the water-soluble organic solvent includes a glycol-based solvent and a cyclic amide-based solvent and the cyclic amide-based solvent contains at least one of ε-caprolactam and N-hydroxyethyl-2-pyrrolidone.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to an ink composition for inkjet printing, a recording method, and a recording medium.

Background Art

[0002] In recent years, the applications of inkjet printing have been expanding. In addition to being used as office and home printers, it is also applied to commercial printing, textile printing, and the like.

[0003] Inkjet inks are required to have excellent ejection reliability by the inkjet method in order to form a desired pattern.

[0004] An ink composition for inkjet printing, which is an inkjet ink applied to fabrics, is also used.

[0005] Particularly, in an ink composition for inkjet printing applied to fabrics, it is advantageous to use a highly hydrophobic acid dye because the wet fastness of the resulting recording medium can be improved (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, in a conventional ink composition for inkjet printing, when a highly hydrophobic acid dye is used, the solubility of the dye is low, so nozzle clogging is likely to occur, and there is a problem that the ejection reliability by the inkjet method is poor.

Means for Solving the Problems

[0008] This invention was made to solve the above-mentioned problems and can be realized in the following application examples.

[0009] An inkjet printing ink composition according to an application example of the present invention is an inkjet printing ink composition containing an acidic dye having a solubility in water of 30 g / L or less at 20°C, a water-soluble organic solvent, and water. The aforementioned water-soluble organic solvent contains a glycol-based solvent and a cyclic amide-based solvent. The glycol-based solvent contains at least triethylene glycol monobutyl ether, The cyclic amide solvent contains N-hydroxyethyl-2-pyrrolidone.

[0010] Furthermore, in inkjet printing ink compositions according to other applications of the present invention, the content of the glycol-based solvent is 10% by mass or more.

[0011] Furthermore, in inkjet printing ink compositions according to other applications of the present invention, the content of the cyclic amide solvent is 0.5% by mass or more.

[0012] Furthermore, in inkjet printing ink compositions relating to other applications of the present invention, the acid dye is one or more selected from the group consisting of CI Acid Red 138, CI Acid Blue 140, CI Acid Red 407, CI Acid Violet 97, and CI Acid Violet 54.

[0013] Furthermore, in inkjet printing ink compositions relating to other applications of the present invention, the glycol-based solvent is a compound having a glycol structure and The triethylene glycol monobutyl ether It contains.

[0014] Furthermore, in inkjet printing ink compositions relating to other applications of the present invention, the glycol-based solvent teeth , moreover, Diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol、 One or more selected from the group consisting of diethylene glycol monobutyl ether, dipropylene glycol monobutyl ether, and dipropylene glycol monopropyl ether things that include is used.

[0015] In addition, in the ink composition for inkjet printing according to another application example of the present invention, the content of the acid dye is 7.0% by mass or less.

[0016] In addition, in the ink composition for inkjet printing according to another application example of the present invention, a surfactant is further contained in a content of 0.4% by mass or more.

[0017] In addition, the recording method according to the application example of the present invention includes a discharging step of discharging the ink composition for inkjet printing according to the application example of the present invention by an inkjet method and attaching it to a fabric, and a dyeing treatment step of fixing the acid dye to the fabric.

[0018] In addition, the recorded matter according to the application example of the present invention has a colored portion by the ink composition for inkjet printing according to the application example of the present invention applied to the fabric by an inkjet method. [Embodiments for Carrying out the Invention]

[0019] [[ID=2"]] Hereinafter, preferred embodiments of the present invention will be described in detail. [1] Ink Composition for Inkjet Printing First, the ink composition for inkjet printing of the present invention will be described.

[0020] The ink composition for inkjet printing of the present invention contains an acid dye having a solubility in water at 20 ° C of 30 g / L or less, a water-soluble organic solvent, and water. And, as the water-soluble organic solvent, a glycol-based solvent and a cyclic amide-based solvent are contained, and the cyclic amide-based solvent contains at least one of ε-caprolactam and N-hydroxyethyl-2-pyrrolidone.

[0021] By using such a highly hydrophobic acid dye, the wet fastness of the resulting recorded matter can be made excellent. By using a predetermined organic solvent in combination, clogging in the inkjet nozzles is less likely to occur. Even when the solid content of the ink composition for inkjet printing is deposited, the redissolubility of the solid content can be made good, and the ejection reliability by the inkjet method can be made excellent.

[0022] [1-1] Acid dye The ink composition for inkjet printing of the present invention contains, as a coloring material, an acid dye having a solubility in water at 20 °C of 30 g / L or less.

[0023] By using such a highly hydrophobic acid dye, the wet fastness of the resulting recorded matter can be made good.

[0024] The ink composition for inkjet printing of the present invention only needs to contain, as a coloring material, an acid dye having a solubility in water at 20 °C of 30 g / L or less. However, the solubility of the acid dye in water at 20 °C is preferably 1 g / L or more and 25 g / L or less, and more preferably 2 g / L or more and 20 g / L or less. Thereby, the above-described effects are more significantly exhibited.

[0025] Examples of the acid dye having a solubility in water at 20 °C of 30 g / L or less include C.I. Acid Red 138, C.I. Acid Blue 140, C.I. Acid Red 407, C.I. Acid Violet 97, C.I. Acid Violet 54, etc. One or more selected from these can be used in combination. Among them, it is preferably one or more selected from the group consisting of C.I. Acid Red 138, C.I. Acid Blue 140, C.I. Acid Red 407, C.I. Acid Violet 97, and C.I. Acid Violet 54. Thereby, the effects of the present invention described above are more significantly exhibited.

[0026] The content of the acid dye in the inkjet printing ink composition is preferably 7.0% by mass or less, more preferably 1.0% by mass or more and 6.0% by mass or less, and even more preferably 1.5% by mass or more and 5.5% by mass or less.

[0027] This makes it easier to ensure sufficient color density in the recording section formed using the inkjet printing ink composition, and also improves the ejection reliability of the inkjet printing ink composition using the inkjet method.

[0028] [1-2]Water The inkjet printing ink composition of the present invention contains water. Water, for example, functions as a solvent for dissolving colorants or as a dispersion medium for dispersing them in inkjet printing ink compositions.

[0029] Furthermore, by including water in the inkjet printing ink composition, the glycol-based solvents and cyclic amide-based solvents, which will be described in detail later, can be uniformly incorporated into the inkjet printing ink composition, allowing these functions to be exhibited more effectively.

[0030] The water content in the inkjet printing ink composition of the present invention is preferably 40.0% by mass or more and 89.0% by mass or less, more preferably 43.0% by mass or more and 85.0% by mass or less, and even more preferably 55.0% by mass or more and 80.0% by mass or less.

[0031] This makes it possible to more reliably adjust the viscosity of inkjet printing ink compositions to a suitable value, thereby improving the reliability of ejection by the inkjet method.

[0032] [1-3] Water-soluble organic solvents The inkjet printing ink composition of the present invention contains a predetermined water-soluble organic solvent. More specifically, the water-soluble organic solvent contains a glycol-based solvent and a cyclic amide-based solvent, wherein the cyclic amide-based solvent contains at least one of ε-caprolactam and N-hydroxyethyl-2-pyrrolidone.

[0033] By using such a water-soluble organic solvent in combination with the highly hydrophobic acidic dyes described above, the acidic dyes can be incorporated into the inkjet printing ink composition in a suitable state, reducing clogging of the inkjet nozzles. Even if solid components of the inkjet printing ink composition precipitate, the resolubility of these solid components can be improved, resulting in excellent ejection reliability by the inkjet method.

[0034] [1-3-1] Glycol-based solvents The glycol-based solvent, as a water-soluble organic solvent contained in the inkjet printing ink composition of the present invention, is a compound having a glycol structure (i.e., a chemical structure in which hydrogen atoms bonded to two carbon atoms of an aliphatic hydrocarbon having two or more carbon atoms in the molecule are each replaced by a hydroxyl group), or a compound having a structure in which a plurality of such compounds are condensed (i.e., a chemical structure having at least one ether oxygen in the molecule and two hydroxyl groups bonded to a hydrocarbon group), and is included in the inkjet printing ink composition in a dissolved state in water.

[0035] Examples of compounds having a glycol structure include diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, 1,2-butanediol, 1,2-pentanediol, 1,2-hexanediol, 1,2-heptanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 2-ethyl-2-methyl-1,3-propanediol, 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 3-methyl-1,3-butanediol, 3-methyl-1,5-pentanediol, and 2-methylpentane-2,4-diol. Examples of compounds having a glycol ether include triethylene glycol monobutyl ether, diethylene glycol monobutyl ether, dipropylene glycol monobutyl ether, and dipropylene glycol monopropyl ether. This allows the effects of the present invention described above to be exhibited more clearly.

[0036] Among the compounds mentioned above, the effects described above are even more pronounced when triethylene glycol monobutyl ether is included.

[0037] In particular, inkjet printing ink compositions preferably contain a glycol-based solvent that includes a compound having a glycol structure and a compound having a glycol ether structure.

[0038] This makes it possible to more effectively reduce trailing when inkjet printing ink compositions are ejected using the inkjet method.

[0039] When an inkjet printing ink composition contains a glycol-based solvent, specifically a compound having a glycol structure and a compound having a glycol ether structure, it is preferable that the following conditions are met. Specifically, the content of the compound having a glycol ether structure per 100 parts by mass of the compound having a glycol structure is preferably 50 parts by mass or more and 300 parts by mass or less, more preferably 60 parts by mass or more and 280 parts by mass or less, and even more preferably 70 parts by mass or more and 260 parts by mass or less. This makes the aforementioned effects even more pronounced.

[0040] The content of glycol-based solvent in the inkjet printing ink composition is preferably 10% by mass or more, more preferably 12% by mass or more and 50% by mass or less, and even more preferably 14% by mass or more and 25% by mass or less.

[0041] This results in improved solubility of the acid dye, and more effectively reduces trailing when the inkjet printing ink composition is ejected by the inkjet method.

[0042] [1-3-2] Cyclic amide solvents The cyclic amide solvent, which is a water-soluble organic solvent contained in the inkjet printing ink composition of the present invention, is a compound having a cyclic amide chemical structure in its molecule and is included in the inkjet printing ink composition in a dissolved state in water. Examples of cyclic amide chemical structures include lactam structures and cyclic urea structures.

[0043] In particular, the inkjet printing ink composition of the present invention contains at least one of ε-caprolactam and N-hydroxyethyl-2-pyrrolidone as a cyclic amide solvent.

[0044] The content of cyclic amide solvents in the inkjet printing ink composition is preferably 0.5% by mass or more, more preferably 1.0% by mass or more and 5.0% by mass or less, and even more preferably 1.5% by mass or more and 4.0% by mass or less.

[0045] This makes it possible to more effectively reduce trailing when inkjet printing ink compositions are ejected using the inkjet method.

[0046] The inkjet printing ink composition of the present invention may further contain, in addition to at least one of ε-caprolactam and N-hydroxyethyl-2-pyrrolidone, other cyclic amide solvents.

[0047] Examples of other cyclic amide solvents include 2-pyrrolidone, N-methyl-2-pyrrolidone, 1,3-dimethylimidazolidinone, 2-piperidone (δ-valerolactam), and N-cyclohexyl-2-pyrrolidone.

[0048] However, the content of the other cyclic amide solvent in the total cyclic amide solvent contained in the inkjet printing ink composition is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 2% by mass or less. The lower limit of the content of the other cyclic amide solvent in the total cyclic amide solvent contained in the inkjet printing ink composition is 0% by mass.

[0049] In an inkjet printing ink composition, when the content of glycol-based solvent is XG [mass%] and the content of cyclic amide-based solvent is XL [mass%], it is preferable that the relationship 1.5 ≤ XG / XL ≤ 50.0 is satisfied, more preferably that 2.4 ≤ XG / XL ≤ 40.0 is satisfied, and even more preferably that 3.5 ≤ XG / XL ≤ 16.6 is satisfied. This allows the effects of the present invention described above to be exhibited more clearly.

[0050] [1-3-3] Other water-soluble organic solvent components The inkjet printing ink composition of the present invention contains the glycol-based solvent and the cyclic amide-based solvent described above, but may also contain other water-soluble organic solvents. Examples of other water-soluble organic solvents include glycerin.

[0051] If the inkjet printing ink composition contains glycerin, the glycerin content in the inkjet printing ink composition is preferably 1% by mass or more and 25% by mass or less, more preferably 3% by mass or more and 20% by mass or less, and even more preferably 5% by mass or more and 15% by mass or less.

[0052] If the inkjet printing ink composition contains other water-soluble organic solvents other than glycerin, the content of these other water-soluble organic solvents in the inkjet printing ink composition is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 2% by mass or less. The lower limit of the content of these other water-soluble organic solvents other than glycerin in the inkjet printing ink composition is 0% by mass.

[0053] [1-4] Surfactants In addition to the components described above, the inkjet printing ink composition of the present invention may further contain a surfactant.

[0054] This makes it possible to improve the ejection reliability of inkjet printing ink compositions using the inkjet method.

[0055] As surfactants, various types of surfactants can be used, such as anionic surfactants, cationic surfactants, and nonionic surfactants.

[0056] Specific examples of surfactants include Surfinol MD-20, Surfinol 82, Surfinol DF110D (2,5,8,11-tetramethyl-6-dodecine-5,8-diol), the Orfin 104 series and Orfin E1010 E series (and above), Orfin EXP4300 (12-C12 ethylene oxide adduct), Surfinol 61, Surfinol 465, Surfinol 104S, Surfinol 104PG50 (2,4,7,9-tetramethyl-5-decine-4,7-diol), Surfinol 420 (product name, manufactured by Air Products Japan), Orfin E1010, Orfin EXP4300, Orfin E1030W, Silface SAG503A (manufactured by Nisshin Chemical Industry Co., Ltd.), and others. One or more of these can be selected and used in combination.

[0057] The surfactant content in the inkjet printing ink composition is preferably 0.4% by mass or more, more preferably 0.45% by mass or more and 1.2% by mass or less, and even more preferably 0.5% by mass or more and 1.0% by mass or less.

[0058] This makes it possible to further improve the ejection reliability of inkjet printing ink compositions by the inkjet method, and to improve the color development of the recording area formed using the inkjet printing ink composition, thereby more effectively preventing the problem of ink bleed-through.

[0059] [1-5] Other ingredients The inkjet printing ink composition of the present invention may contain components other than those described above. Hereinafter, such components will also be referred to as "other components."

[0060] Other components include, for example, colorants other than the aforementioned acid dyes; ureas such as urea, ethylene urea, tetramethylurea, and thiourea; chelating agents; preservatives; fungicides; rust inhibitors; flame retardants; various dispersants; antioxidants; ultraviolet absorbers; oxygen absorbers; solubilizers; penetrating agents, etc.

[0061] Examples of colorants other than the aforementioned acid dyes include acid dyes, dyes other than acid dyes, and pigments, which have a solubility in water of more than 30 g / L at 20°C.

[0062] Examples of chelating agents include ethylenediaminetetraacetate. Examples of preservatives and antifungal agents include sodium benzoate, sodium pentachlorophenol, sodium 2-pyridinethiol-1-oxide, sodium sorbate, sodium dehydroacetate, 1,2-dibenzoisothiazolin-3-one, and 4-chloro-3-methylphenol. Examples of rust inhibitors include benzotriazole.

[0063] For example, compounds having an isothiazolin ring structure within the molecule can be suitably used as preservatives and fungicides.

[0064] The content of other components is preferably 6.0% by mass or less, more preferably 5.0% by mass or less, and even more preferably 2.0% by mass or less. Furthermore, the lower limit of the content of other components is 0% by mass.

[0065] [1-6] Others The surface tension of the inkjet printing ink composition of the present invention at 20°C is not particularly limited, but is preferably 20 mN / m or more and 60 mN / m or less, more preferably 25 mN / m or more and 50 mN / m or less, and even more preferably 30 mN / m or more and 40 mN / m or less.

[0066] This makes inkjet head nozzle clogging less likely, improving the reliability of inkjet printing ink ejection. Furthermore, even if nozzle clogging occurs, the ability to recover by capping the nozzle is improved.

[0067] Furthermore, the surface tension can be measured using either the Wilhelmy method or the ring method. Surface tension can be measured using a surface tensimeter (for example, Kyowa Interface Science Co., Ltd.'s DY-300, DY-500, DY-700, etc.).

[0068] The viscosity of the inkjet printing ink composition of the present invention at 20°C is preferably 2 mPa·s to 10 mPa·s, and more preferably 3 mPa·s to 8 mPa·s.

[0069] This results in improved ejection reliability of inkjet printing ink compositions using the inkjet method.

[0070] Viscosity can be determined by measuring it using a vibrating viscometer, a rotary viscometer, a capillary viscometer, or a falling ball viscometer. For example, with a vibrating viscometer, it can be determined by measurement in accordance with JIS Z8809.

[0071] The inkjet printing ink composition of the present invention may be ejected by an inkjet method, and examples of inkjet methods include on-demand methods such as charge deflection, continuous, piezo, and bubble jet (registered trademark) methods, but the inkjet printing ink composition of the present invention is particularly preferably ejected from an inkjet head using a piezo oscillator.

[0072] This makes it possible to more effectively prevent the degradation of colorants and other materials within the inkjet head, thereby improving the reliability of inkjet printing.

[0073] [2] Inkjet printing ink composition set Next, the inkjet printing ink composition set according to the present invention will be described.

[0074] The inkjet printing ink composition set according to the present invention comprises a plurality of inkjet printing ink compositions. At least one of the inkjet printing ink compositions constituting the inkjet printing ink composition set is the inkjet printing ink composition of the present invention described above.

[0075] In the inkjet printing ink composition set according to the present invention, at least one of the multiple inkjet printing ink compositions constituting the set may be one of the aforementioned inkjet printing ink compositions of the present invention, and the inkjet printing ink composition set according to the present invention may also include inkjet printing ink compositions other than those described above. In particular, it is preferable that the inkjet printing ink composition set according to the present invention comprises multiple types of inkjet printing ink compositions of the present invention, and it is more preferable that all of the constituent inkjet printing ink compositions are inkjet printing ink compositions of the present invention.

[0076] The inkjet printing ink composition set according to the present invention preferably comprises three inkjet printing ink compositions corresponding to the three primary colors, namely cyan, magenta, and yellow. The three primary colors may be further subdivided according to their color density. For example, in addition to cyan, magenta, and yellow, the set may also include light cyan, light magenta, and light yellow.

[0077] Furthermore, the inkjet printing ink composition set according to the present invention may also include achromatic ink, more specifically, black ink.

[0078] [3] Recording method Next, the recording method of the present invention will be described.

[0079] The recording method of the present invention comprises an ejection step of ejecting the inkjet printing ink composition of the present invention described above by an inkjet method and adhering it to a fabric, and a dyeing step of fixing the acid dye to the fabric.

[0080] This makes it less likely for inkjet ink compositions to clog inkjet nozzles, and even if solid components of the inkjet ink composition precipitate, the resolubility of those solid components can be improved, providing a recording method that can stably produce records with excellent wet fastness and reliability.

[0081] [3-1] Discharge process In the ejection process, the inkjet printing ink composition of the present invention is ejected as droplets by an inkjet method, and these droplets are attached to a fabric. This forms a desired image. Multiple types of inkjet printing ink compositions, such as the inkjet printing ink composition of the present invention, may be used to form the image.

[0082] Any inkjet method can be used to eject the inkjet printing ink composition, including, for example, on-demand methods such as charge deflection, continuous, piezo, and bubble jet (registered trademark) methods.

[0083] [3-2] Dyeing process In the dyeing process, the dye material attached to the fabric is fixed in place. The dyeing process is typically carried out under high temperature and high humidity conditions.

[0084] The processing temperature in the dyeing process is not particularly limited, but is preferably 90°C to 150°C, more preferably 95°C to 130°C, and even more preferably 98°C to 120°C.

[0085] This allows for more effective prevention of unintended alteration or deterioration of the recording medium, such as the fabric or the components of the inkjet printing ink composition, while also enabling more efficient fixation of the colorant.

[0086] The processing time for the dyeing process is not particularly limited, but is preferably between 1 minute and 120 minutes, more preferably between 2 minutes and 90 minutes, and even more preferably between 3 minutes and 60 minutes.

[0087] This makes it possible to improve the dyeing properties of the colorant to the fabric used as the recording medium, while also improving the productivity of the recorded material.

[0088] For high-temperature humidification treatment in the dyeing process, various types of steamers, such as the Matisse DHe steamer, can be used.

[0089] The recording method according to the present invention may include steps other than the discharge step and the dyeing step, if necessary.

[0090] For example, the process may include a pre-treatment step in which the fabric used as the recording medium is pre-treated prior to the discharge process.

[0091] For pretreatment, for example, known pretreatment agents can be used, which generally contain a thickening agent, a pH adjuster, and a hydrotropic agent.

[0092] Suitable adhesives include, for example, natural gums, starches, seaweed, plant bark, cellulose derivatives, modified starch, modified natural gum, sodium alginate, algin derivatives, synthetic adhesives, emulsions, and the like.

[0093] Examples of natural gums include gua and locust bean. Examples of seaweed include funori. Examples of plant bark include pectin. Examples of cellulose derivatives include methylcellulose, ethylcellulose, hydroxyethylcellulose, and carboxymethylcellulose. Examples of modified starches include roasted starch, alpha starch, carboxymethyl starch, carboxyethyl starch, and hydroxyethyl starch. Examples of processed natural gums include syrup gum and roasted bean gum. Examples of synthetic adhesives include polyvinyl alcohol and polyacrylic acid esters.

[0094] Furthermore, as pH adjusting agents, for example, ammonium sulfate, ammonium tartrate, and other ammonium acid salts can be suitably used.

[0095] Furthermore, various ureas can be used as hydrotropic agents, such as urea, dimethylurea, thiourea, monomethylthiourea, and alkylureas such as dimethylthiourea. Furthermore, the pretreatment agent may also contain, for example, silica.

[0096] Furthermore, for example, after the dyeing process, the process may include a washing step, if necessary, in which the dyed fabric is washed.

[0097] The washing process can be carried out, for example, by rubbing the dyed fabric in tap water, and then immersing it in a washing solution containing a nonionic soaping agent in warm water at 40°C to 70°C, while stirring as needed. The immersion time in the washing solution can be, for example, 5 minutes to 60 minutes. Afterwards, the detergent can be removed by hand rubbing while adding tap water to the washing solution.

[0098] [3-3]Fabric Next, we will describe the fabric used as a recording medium to which the inkjet printing ink composition is applied.

[0099] As for the fabric, various types of weaves can be used, such as plain weave, twill weave, satin weave, modified plain weave, modified twill weave, modified satin weave, variegated weave, patterned weave, single-layer weave, double weave, multi-layer weave, warp pile weave, weft pile weave, and leno weave.

[0100] Furthermore, the thickness of the fibers that make up the fabric can be, for example, between 10d and 100d.

[0101] Examples of fibers that make up the fabric include synthetic fibers such as polyester fibers, nylon fibers, triacetate fibers, diacetate fibers, polyamide fibers, and cellulose fibers; regenerated fibers such as rayon; and natural fibers such as cotton, silk, and wool. Blends of these may also be used.

[0102] [4] Records The recording material according to the present invention has a colored portion applied to a fabric by an inkjet printing ink composition of the present invention, and can be manufactured using the recording method described above.

[0103] This effectively prevents defects caused by ejection failures and other issues in the inkjet method, and provides recording materials with excellent wet fastness.

[0104] Although preferred embodiments of the present invention have been described above, the present invention is not limited thereto. [Examples]

[0105] Next, specific embodiments of the present invention will be described. [5] Preparation of ink composition for inkjet printing

[0106] (Example 1) Each component shown in Table 1 was placed in a predetermined ratio in a predetermined container and mixed and stirred with a stirrer for 1 hour. Subsequently, the mixture was filtered through a 1 μm pore size membrane filter (Merck Millipore, Omnipore Membrane Filter: JAWP) to obtain an inkjet printing ink composition with the composition shown in Table 1.

[0107] (Examples 2-33) An inkjet printing ink composition was prepared in the same manner as in Example 1, except that the types of components used in the preparation of the inkjet printing ink composition and the mixing ratio of each component were changed to obtain the compositions shown in Tables 1 to 4.

[0108] (Comparative Examples 1-9) An inkjet printing ink composition was prepared in the same manner as in Example 1, except that the types of components used in the preparation of the inkjet printing ink composition and the mixing ratio of each component were changed to obtain the composition shown in Table 5.

[0109] [6] Rating The inkjet printing ink compositions of each of the above examples and comparative examples were evaluated as follows.

[0110] [6-1] Continuous dispensing reliability (1) The inkjet printing ink compositions of each example and comparative example were loaded into a Monna Lisa Evo Tre 32-180 inkjet printing machine (manufactured by Seiko Epson Corporation), and pre-treated 100% silk fabric (twill, 50-60 g / m²) was used. 2 A roll (140cm wide) was set up, and continuous printing was performed in 600x600D.PI2Pass mode.

[0111] The silk fabric was pre-treated by applying a pre-treatment solution prepared by mixing 1% by mass of sodium alginate, 1% by mass of guar gum, 4% by mass of ammonium sulfate, 10% by mass of urea, and 84% by mass of water to the fabric, squeezing it with a mangle at a pick-up rate of 20%, and then drying it.

[0112] Nozzle checks were performed every 100m of silk fabric feed to confirm that printing was normal without any gaps or distortions, and the results were evaluated according to the following criteria.

[0113] A: The amount of silk fabric that was successfully printed on was 1000m or more. B: The amount of silk fabric that was successfully printed on is between 500m and 1000m. C: The amount of silk fabric that was successfully printed was between 200m and 500m. D: The amount of silk fabric that was successfully printed on was less than 200m.

[0114] [6-2] Continuous Discharge Reliability (2) The inkjet printing ink compositions of each example and comparative example were filled into any of the color columns (Cyan, Magenta, Yellow, Photo Black) of an inkjet printer EW-M770T (manufactured by Seiko Epson Corporation), and continuous printing was performed using FUJI XEROX printer paper "P" (A4 size) in plain paper / standard mode.

[0115] A nozzle check was performed every 1000 sheets to confirm that printing was normal without any missing or crooked lines, and the results were evaluated according to the following criteria.

[0116] A: The number of pages printed successfully is 5000 or more. B: The number of successfully printed pages is between 2500 and 5000. C: The number of successfully printed pages is between 1000 and 2500. D: The number of pages printed successfully is less than 1000.

[0117] [6-3] Discharge recovery property The inkjet printing ink compositions of each of the above examples and comparative examples were each loaded into the Cyan row of an inkjet printer EW-M770T (manufactured by Seiko Epson Corporation).

[0118] Next, a cleaning operation was performed, and more specifically, when the inkjet head detached from the cap and moved to the printing area, the power cable was unplugged to forcibly stop the process.

[0119] After leaving the device in this state at 20°C / 25%RH for two weeks, the power cable was plugged in again and the power was turned on. The number of cleaning cycles required until the device started discharging normally was then counted and evaluated according to the following criteria.

[0120] A: It was restored with four or fewer cleanings. B: It was restored after 5 to 7 cleanings. C: Recovered after 8 to 10 cleaning cycles. D: The problem did not improve even after 10 cleaning attempts.

[0121] [6-4] Robustness First, two types of fabric, namely, <1> Silk fabric (14 momme silk habutae, made by Irozome Co.), <2> I prepared a nylon fabric (nylon 6 taffeta, manufactured by Irozome Co., Ltd.).

[0122] These fabrics were coated with the following pretreatment solution, squeezed with a mangle at a pick-up rate of 20%, and dried to obtain fabrics for recording material production.

[0123] Sodium alginate: 1.0% by mass Guar gum: 1.0% by mass Ammonium sulfate: 4.0% by mass Urea: 10.0% by mass Water: 84.0% by mass

[0124] An ink cartridge containing the inkjet printing ink compositions of each example and comparative example described above was installed in a Seiko Epson inkjet textile printing machine "Monna-Lisa EVO TRE 16," and the ink was applied to the fabric for manufacturing the above-mentioned recording material at a coating rate of 1.2 mg / cm² per unit area using the "900 x 600 D.PI, 2-pass" printing mode. 2The solid color printing was carried out evenly to achieve this result.

[0125] After printing, the prints were steamed at 100°C for 30 minutes using a Matisse steamer (DHe model), and then washed with water to remove any unfixed dye.

[0126] Furthermore, the cloth was washed for 10 minutes using 55°C hot water containing 0.2% by mass of Rakcol STA (cleaning aid; manufactured by Meisei Chemical Co., Ltd.), and then dried to obtain a printing cloth for recording purposes.

[0127] The obtained printable fabrics were subjected to various colorfastness tests according to JIS L 0844:2011 A-2 method and evaluated according to the following criteria. The attached white cloth used was silk (No. 2-1) as described in JIS L 0803.

[0128] A: The robustness test result is level 4 or higher. B: The robustness result is between level 3 and level 4. C: The robustness result is between level 2 and level 3. D: The robustness result is below level 2.

[0129] These results, along with the compositions of the inkjet printing ink compositions for each of the above examples and comparative examples, are summarized in Tables 1 to 5.In the table, the unit of content for each component is mass%. CI Acid Red 138, an acid dye with a solubility of 19.0 g / L in water at 20°C, is denoted as "AR138". CI Acid Blue 140, an acid dye with a solubility of 10.0 g / L in water at 20°C, is denoted as "AB140". CI Acid Red 407, an acid dye with a solubility of 10.9 g / L in water at 20°C, is denoted as "AR407". CI Acid Violet 9, an acid dye with a solubility of 30.0 g / L or less in water at 20°C, is denoted as "AR407". 7 is designated "AV97", CI Acid Violet 54, an acid dye with a solubility of 2.3 g / L in water at 20°C, is designated "AV54", CI Acid Violet 48, an acid dye with a solubility of 36.3 g / L in water at 20°C, is designated "AV48", CI Acid Yellow 79, an acid dye with a solubility of 106 g / L in water at 20°C, is designated "AY79", CI Disperse Blue 87, a disperse dye with a solubility of 485 g / L in water at 20°C, is designated "DB87", and a glycol structure is designated Diethylene glycol, a compound, is designated as "DEG". Triethylene glycol monobutyl ether, a compound having a glycol ether structure, is designated as "BTG". Diethylene glycol monobutyl ether, a compound having a glycol ether structure, is designated as "BDG". Dipropylene glycol monobutyl ether, a compound having a glycol ether structure, is designated as "BFDG". Dipropylene glycol monopropyl ether, a compound having a glycol ether structure, is designated as "PFDG". ε-caprolactam, a cyclic amide solvent, is designated as "εCL". N-hydroxyethyl-2-pyrrolidone, a cyclic amide solvent, is designated as "HEP". 2-pyrrolidone, a cyclic amide solvent, is designated as "2PY". N-methyl-2-pyrrolidone, a cyclic amide solvent, is designated as "NMP". 1,3-dimethylimidazolidinone, a cyclic amide solvent, is designated as "DMI". Glycerin is designated as "Gly". Olphine E1010 (manufactured by Nisshin Chemical Industry Co., Ltd.), an acetylene glycol surfactant, is designated as "E1010". Triethanolamine is designated as "TEA". Proxel XL-2 (manufactured by Lonza) is abbreviated as "XL2," the rust inhibitor benzotriazole as "BTA," and the chelating agent ethylenediaminetetraacetate as "EDTA."Tables 1 to 5 also show the XL / XG values ​​for the inkjet printing ink compositions, where XG [mass%] is the content of glycol-based solvents and XL [mass%] is the content of cyclic amide-based solvents. Furthermore, all of the inkjet printing ink compositions in the above examples had a surface tension of 30 mN / m to 40 mN / m at 20°C and a viscosity of 3 mPa·s to 8 mPa·s at 20°C. Surface tension was measured using the Wilhelmy method with a surface tensile meter (Kyowa Interface Science Co., Ltd., DY-300), and viscosity was measured in accordance with JIS Z8809 using a vibrating viscometer (Senicock Corporation, VM-100).

[0130] [Table 1]

[0131] [Table 2]

[0132] [Table 3]

[0133] [Table 4]

[0134] [Table 5]

[0135] As is clear from Tables 1 to 5, the present invention yielded excellent results, whereas the comparative examples did not yield satisfactory results.

Claims

1. An inkjet printing ink composition containing an acid dye having a solubility in water of 30 g / L or less at 20°C, a water-soluble organic solvent, and water, The aforementioned water-soluble organic solvent contains a glycol-based solvent and a cyclic amide-based solvent. The glycol-based solvent contains at least triethylene glycol monobutyl ether, An inkjet printing ink composition wherein the cyclic amide solvent contains N-hydroxyethyl-2-pyrrolidone.

2. The inkjet printing ink composition according to claim 1, wherein the content of the glycol-based solvent is 10% by mass or more.

3. The inkjet printing ink composition according to claim 1 or 2, wherein the content of the cyclic amide solvent is 0.5% by mass or more.

4. The inkjet printing ink composition according to any one of claims 1 to 3, wherein the acid dye is one or more selected from the group consisting of C.I. Acid Red 138, C.I. Acid Blue 140, C.I. Acid Red 407, C.I. Acid Violet 97, and C.I. Acid Violet 54.

5. The inkjet printing ink composition according to any one of claims 1 to 4, wherein the glycol-based solvent contains a compound having a glycol structure and the triethylene glycol monobutyl ether.

6. The inkjet printing ink composition according to any one of claims 1 to 5, wherein the glycol-based solvent further comprises one or more selected from the group consisting of diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, diethylene glycol monobutyl ether, dipropylene glycol monobutyl ether, and dipropylene glycol monopropyl ether.

7. The inkjet printing ink composition according to any one of claims 1 to 6, wherein the content of the acid dye is 7.0% by mass or less.

8. Furthermore, the inkjet printing ink composition according to any one of claims 1 to 7 contains a surfactant in an amount of 0.4% by mass or more.

9. A dispensing step of dispensing the inkjet printing ink composition according to any one of claims 1 to 8 by an inkjet method and adhering it to a fabric, A recording method comprising a dyeing process step of fixing the acid dye to the fabric.

10. A recording material having a colored portion applied to a fabric by an inkjet printing ink composition according to any one of claims 1 to 8.

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