Ink Package

Abstract

To provide an ink package that is excellent in stability in storing an ink composition containing dyestuff having a structure of coumarin.SOLUTION: An ink bottle 10 comprises an inkjet ink composition L and a storage part 22 that stores the inkjet ink composition L, which includes a material whose heat conductivity is 0.29 W / mK or less, where the inkjet ink composition L includes a color material having a coumarin-based skeleton and water.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an ink package. [Background technology]

[0002] The inkjet recording method is capable of recording high-definition images with a simpler device than conventional analog printing devices, and has been rapidly developed in various fields. In the process, various studies have been conducted on ejection stability, etc. For example, Patent Document 1 discloses a yellow ink composition containing a dye having a coumarin structure as a fluorescent dye. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-190932 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the inkjet ink composition (hereinafter also referred to as ink composition) described in Patent Document 1 has a problem in that it is difficult to ensure storage stability. More specifically, it is difficult to ensure storage stability in an ink composition containing a dye having a coumarin structure, and storage stability is also affected by the shape of the ink package itself, which is the ink storage container. If storage stability is insufficient, foreign matter is likely to be generated, which affects the ejection performance from the inkjet head. In other words, there has been a demand for an ink package that improves storage stability. [Means for solving the problem]

[0005] The ink package includes an inkjet ink composition and a storage section for storing the inkjet ink composition, and includes a material having a thermal conductivity of 0.29 W / mK or less, and the inkjet ink composition includes a colorant having a coumarin skeleton and water. [Brief description of the drawings]

[0006] [Figure 1] 1 is a schematic cross-sectional view of an ink bottle 10 according to an embodiment. [Diagram 2] FIG. 2 is a schematic cross-sectional view of the ink bottle 10. [Diagram 3] FIG. 11 is a schematic cross-sectional view of an ink bottle 110 in another embodiment. [Figure 4] FIG. 11 is a schematic cross-sectional view of an ink bottle 120 in another embodiment. [Diagram 5] FIG. 11 is a schematic cross-sectional view of an ink bottle 130 in another embodiment. [Figure 6] FIG. 11 is a schematic cross-sectional view of an ink bottle 140 in another embodiment. [Figure 7] FIG. 13 is a schematic perspective view of an ink bottle 150 in another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] The following describes an embodiment of the present invention. The embodiment described below is an example of the present invention. The present invention is not limited to the following embodiment, and includes various modified forms that are implemented within the scope of the present invention. Note that not all of the configurations described below are necessarily essential configurations of the present invention.

[0008] 1. Ink packaging An ink bottle is exemplified as an ink package according to this embodiment. The ink bottle according to this embodiment may be an ink bottle to be mounted on a recording device such as an inkjet printer, or may be a refill ink bottle for temporarily storing an inkjet ink composition to be refilled into the recording device. The ink package of the present invention is not limited to an ink bottle, and may be in the form of an ink pack, an ink cartridge, an ink box, an ink pouch, or the like.

[0009] The ink bottle contains an ink-jet ink composition (hereinafter also referred to as an ink composition). The ink bottle may also contain a gas. The ink bottle includes a container body, a spout, and a seal. Below, the container body, spout, and seal that the ink bottle includes will be described, followed by a description of the ink-jet ink composition, gas, etc., contained in the ink bottle.

[0010] 1 and 2 are schematic cross-sectional views of an ink bottle 10 according to this embodiment. Fig. 1 shows a state in which a spout 14 has been removed from a container body 12. Fig. 2 shows a state in which the spout 14 is connected to the container body 12.

[0011] As shown in Figures 1 and 2, the ink bottle 10 comprises a container body 12 capable of containing an ink composition L, a spout 14 connected to the container body 12, and a sealing body 16 attached to the container body 12.

[0012] 1 and 2 in which the spout 14 and the closure 16 are located at the vertical upper end (tip) of the container body 12, and the directions in the following explanation refer to the directions in the storage position. When ink composition L contained in the ink bottle 10 is to be supplied to a receiving destination such as an ink tank, the ink bottle 10 is tilted from the storage position to allow the ink composition L to fall, but in this specification, the position in which the spout 14 is located at the vertical lower end of the container body 12 may be referred to as the supplying position.

[0013] The container body 12 has a bottomed cylindrical storage section 22 that forms a storage chamber 21 capable of storing the ink composition L, and a cylindrical neck section 23 having a smaller diameter than the storage section 22. The neck section 23 is formed at the tip of the storage section 22, and a first male screw 24 is formed on the outer circumferential surface of the neck section 23. In the illustrated example, the storage section 22 has a bottomed cylindrical shape, but is not limited to this. In addition, the container body 12 may be a bag-like, indefinite shape, such that the shape of the storage section 22 can be deformed. In addition, the storage section 22 is not limited to being approximately cylindrical.

[0014] It is more preferable that the container body 12 is a rigid container or a semi-rigid container. The rigid container refers to a container that hardly deforms when handled by a user, and the semi-rigid container refers to a container that returns to its original shape even if it is deformed when handled by a user.

[0015] The ink bottle 10 includes a material having a thermal conductivity of 0.29 W / mK or less. More specifically, the thermal conductivity of the material of at least the members of the ink bottle 10 that come into contact with the ink composition L is set to 0.29 W / mK or less. The above members include the storage section 22 of the container body 12.

[0016] Materials that contain materials with a thermal conductivity of 0.29 W / mK or less tend to be less conductive to heat than materials that contain materials with a thermal conductivity of more than 0.29 W / mK.

[0017] Such materials include plastics, and among them, polypropylene, polycarbonate, and polyethylene terephthalate are preferably used, which allows the use of inexpensive and easily available materials.

[0018] The container body 12 may have a multi-layer structure, but is made of materials including a material having a thermal conductivity of 0.29 W / mK or less. The thermal conductivity of a material can be measured according to ISO / CD 22007-2 or the like.

[0019] This ink bottle 10 can improve the storage stability of the ink composition L. More specifically, even if it contains a coloring material having a coumarin skeleton that is prone to depositing foreign matter, the thermal conductivity of the material is below a specified value, so that in situations where heat is applied, such as during transportation, heat is not easily transferred to the ink composition L inside. This prevents the generation of foreign matter and improves storage stability.

[0020] The storage section 22 is formed from a material with a thermal conductivity of 0.29 W / mK or less, which can adequately ensure the storage stability of the ink composition L in the ink bottle 10. In addition, the thickness of the inner surface of the storage section 22 and the outer surface exposed to the outside is preferably 200 μm or more, and more preferably 1000 μm or more. This makes it even more difficult for heat to be transferred to the ink composition L contained in the ink bottle 10, and can further improve the storage stability of the ink composition L.

[0021] The surface roughness of the inner surface 27 of the storage section 22 is preferably 40 rsm or more. From the viewpoint of storage stability of the ink composition L, the surface roughness is more preferably 100 rsm or more. The surface roughness of the material can be measured according to ISO25178 or the like. According to this, the ink composition L is more likely to flow at the contact surface between the inside of the ink bottle 10 and the ink composition L. This makes it possible to disperse the ink composition L when heated, and to suppress the generation of foreign matter.

[0022] The volume of the ink composition L contained in the container 22 is preferably 100 ml or more. In other words, the ink bottle 10 is preferably capable of containing 100 ml or more of the ink composition L. In this way, the volume of the ink composition L contained is relatively large, so that the time it takes for heat to be applied to the entire ink composition L is delayed, and in addition, the heat is dispersed, so that heat is less likely to be applied to the entire ink composition L, thereby suppressing the generation of foreign matter.

[0023] The spout 14 is provided with an outlet 26 that allows the ink composition L to flow out from the storage chamber 21. When the spout 14 is connected to the container body 12 with the sealing body 16 removed and the ink bottle 10 is placed in a position vertically opposite to the storage position, the ink composition L can be discharged from the outlet 26 of the spout 14.

[0024] 2, spout 14 has a large diameter portion 29 located on the outer circumferential side of neck portion 23 when attached to container body 12, and a small diameter portion 30 that forms outlet 26 at a position away from container body 12. A first female thread 31 that can be screwed into first male thread 24 is formed on the inner circumferential surface of large diameter portion 29. Spout 14 is attached to the tip of container body 12 by screwing first female thread 31 into first male thread 24.

[0025] The shape of outlet 26 of spout 14 is arbitrary, and is formed to fit the shape of a recipient of ink composition L, such as an ink tank of a printer. Furthermore, ink bottle 10 may have a packing to assist in airtightness inside when spout 14 and container body 12 are connected, and may have a mechanism or shape for sliding and bringing them into close contact with each other.

[0026] With regard to the spout 14 and the seal 16, it is preferable that the ink bottle 10 has a cap that closes the container 22 from the outside and is removable. This can prevent the evaporation of water and organic solvents. In particular, by providing a removable cap, it is possible to store the ink when it has been used, which increases the convenience.

[0027] In the ink bottle 10, a seal 16 is provided at the opening of the container body 12. That is, the seal 16 is provided at the tip of the neck portion 23 of the container body 12. The seal 16 seals the ink composition L contained in the container portion 22 of the container body 12. The seal 16 and the container body 12 are joined together by, for example, an adhesive. The seal 16 and the container body 12 may also be joined together by a heat sealing method.

[0028] It is more preferable that the sealing body 16 and the container body 12 are joined so that the user can remove the sealing body 16 by peeling it off by hand. The sealing body 16 may also be designed so that the user can open it by breaking it. The sealing body 16 may be in the form of a rigid screw cap (see FIG. 6) or a plug (not shown), and the storage chamber 21 may be kept airtight by using a packing or the like as necessary.

[0029] As described above, there are no limitations on the shape, material, etc. of the sealing body 16 as long as it can maintain the airtightness of the storage chamber 21. However, from the standpoint of ease of handling, manufacturing costs, etc., it is more preferable that the sealing body 16 be composed of a film.

[0030] The ink bottle 10 may contain the ink composition L and a gas. The gas is usually air, but the air may be replaced with an inert gas such as nitrogen or argon. The gas may also contain volatile components of the ink composition L.

[0031] Various modifications are possible to the ink bottle 10. Figures 3 to 7 are schematic cross-sectional views or schematic oblique views of ink bottles 110 to 150 according to other configurations of the ink bottle 10 of this embodiment (hereinafter also referred to as ink bottles of other configurations). For the ink bottles 110 to 150 of other configurations, members having the same actions and functions as those of the ink bottle 10 described above are designated by the same reference numerals, and detailed description thereof will be omitted.

[0032] 3 includes a container body 12 capable of containing ink composition L, a spout 14 connected to the container body 12, and a seal 16 attached to the spout 14. The ink bottle 110 differs from the ink bottle 10 described above in that the seal 16 is attached to the spout 14. In the ink bottle 110, a packing 40 is provided at the connection between the container body 12 and the spout 14 to maintain airtightness.

[0033] In the ink bottle 110, the ink composition L can be accommodated inside the spout 14 in addition to the capacity of the storage chamber 21 of the container body 12, so that a larger amount of ink composition L can be accommodated. Storing a larger amount of ink composition L not only slows down the time it takes for heat to be applied to the entire ink composition L, but also disperses the heat, making it more difficult for heat to be applied to the entire ink composition L, thereby suppressing the generation of foreign matter. It is preferable that the container body 12 and the spout 14 of the ink bottle 110 not be separated during transportation, storage, or use.

[0034] 4 shows another form of ink bottle 120 in which portion 12a corresponding to container body 12 and portion 14a corresponding to spout 14 are integrally formed. Ink bottle 120 is equipped with a seal 16 attached to portion 14a corresponding to spout 14. Ink bottle 120 differs from ink bottle 110 described above in that container body 12a and spout 14a are integrally formed.

[0035] 5, an ink bottle 130 of another form includes a container body 12 capable of containing an ink composition L, a spout 14 connected to the container body 12, a seal 16 attached to the container body 12, and a cap 50 covering the outlet 26 of the spout 14. The ink bottle 130 differs from the ink bottle 10 described above in that it includes a cap 50. The cap 50 is detachable from the spout 14. When the cap 50 is attached to the spout 14, it becomes possible to seal the storage section 22 from the outside world even in the absence of the seal 16.

[0036] In the ink bottle 130, the discharge port 26 of the spout 14 can be mechanically protected by attaching the cap 50. Furthermore, by attaching the cap 50, contamination of the spout 14 can be suppressed.

[0037] 6, an ink bottle 140 of another form includes a container body 12 capable of containing ink composition L, a spout 14 connected to the container body 12, and a seal 60 attached to the container body 12. The ink bottle 140 differs from the ink bottle 10 described above in that the seal 60 is not in the form of a film but is a rigid screw cap.

[0038] The ink bottle 140 comprises a container body 12 that can be fitted into the spout 14, and a seal 60 that seals the space provided in the container body 12 and that contains the ink composition L. In other words, an ink bottle kit can be composed of the spout 14 and the container body 12 that contains the ink composition L and is sealed by the seal 60. In this way, for example, the spout 14 can be reused, and the transportation costs of the ink composition L can be reduced.

[0039] In addition, when the container body 12 is provided with the seal 16 as in the above-mentioned ink bottles 10 and 130, an ink bottle kit can be constructed in the same manner as the ink bottle 140.

[0040] 7, an ink bottle 150 of another form comprises a container body 12 capable of containing ink composition L, a spout 14 connected to the container body 12, and a seal 16 attached to the spout 14. The ink bottle 150 differs from the ink bottle 110 described above in that the containing section 22 has a pair of outer surfaces that face each other.

[0041] The ink bottle 150 has a pair of outer surfaces 25 facing each other in the outer shape of the container body 12. The distance 25d between the pair of outer surfaces is 3.5 cm or less. This allows for easy delivery, such as by dropping the ink bottle 150 in a postbox, which is more convenient. Depending on the location of the postbox, the inside of the postbox may become hot. However, since the ink bottle of this embodiment does not easily transfer heat to the ink composition L inside, the generation of foreign matter is suppressed even if the inside of the postbox into which the ink bottle 150 has been dropped becomes hot.

[0042] 2. Inkjet ink composition The ink composition L of this embodiment contains a coloring material having a coumarin structure and water.

[0043] 2.1. Colorants with coumarin structure Among coloring materials, coloring materials having a coumarin structure are particularly prone to generating foreign matter when exposed to heat. That is, in the water-based ink composition L in which water is the main solvent, coloring materials having a coumarin structure undergo hydrolysis when in contact with water. It is believed that the hydrolyzate becomes foreign matter.

[0044] The coloring material in the present invention is not particularly limited as long as it has a coumarin structure, and examples thereof include dyes having a coumarin structure and organic pigments having a coumarin structure. Among these, dyes are preferred, and disperse dyes are more preferred. In this embodiment, the "coloring material having a coumarin structure" may be a coloring material having a coumarin skeleton, and may be, for example, a compound (coloring material) having a structure in which at least one hydrogen atom in the coumarin structure is substituted with another atom or atomic group. The coloring material having a coumarin structure may be used alone or in combination of two or more kinds.

[0045] Examples of the dye include acid dyes having a coumarin structure, such as CI (Colour Index Generic Name) Acid Yellow, CI Acid Red, CI Acid Blue, CI Acid Orange, CI Acid Violet, and CI Acid Black; basic dyes having a coumarin structure, such as CI Basic Yellow, CI Basic Red, CI Basic Blue, CI Basic Orange, CI Basic Violet, and CI Basic Black; direct dyes having a coumarin structure, such as CI Direct Yellow, CI Direct Red, CI Direct Blue, CI Direct Orange, CI Direct Violet, and CI Direct Black; reactive dyes having a coumarin structure, such as CI Reactive Yellow, CI Reactive Red, CI Reactive Blue, CI Reactive Orange, CI Reactive Violet, and CI Reactive Black; and disperse dyes having a coumarin structure, such as CI Disperse Yellow, CI Disperse Red, CI Disperse Blue, CI Disperse Orange, CI Disperse Violet, and CI Disperse Black.

[0046] Among these, disperse dyes, acid dyes that are not disperse dyes but are difficult to dissolve in water and are dispersed in water-based inks, and basic dyes are preferred, and among these, sublimation dyes are more preferred. Here, the term "sublimation dye" refers to a dye that has the property of sublimating when heated. More specifically, such sublimation dyes include CI Disperse Yellow 82, CI Disperse Yellow 232, and CI Acid Yellow 184. Among these, it is preferred to use CI Disperse Yellow 82 and CI Disperse Yellow 232. This can improve the chroma of yellow when the ink composition L is applied to a medium such as an intermediate transfer medium or a dyed object.

[0047] The content of the coloring material having a coumarin structure is preferably 0.05% by mass or more and 20% by mass or less relative to the total amount of ink composition L, from the viewpoint of more effectively and reliably achieving the effects of this embodiment.

[0048] In this embodiment, the ink composition L may contain a coloring material other than the coloring material having a coumarin structure, as long as the effect of the present invention is not impaired.

[0049] A dispersant may be used to disperse the colorant having a coumarin structure in the ink composition L. As the dispersant, known dispersants can be used.

[0050] 2.2.Water Examples of water include pure water, such as ion-exchanged water, ultrafiltered water, reverse osmosis water, and distilled water, and ultrapure water.

[0051] Coloring materials having a coumarin structure or disperse dyes tend to have poor storage stability when the water content is low. Therefore, from the viewpoint of more effectively and reliably achieving the effects of the present embodiment, the water content is preferably 30% by mass or more and 80% by mass or less with respect to the total amount of ink composition L.

[0052] 2.3. Water-soluble organic solvents The ink composition L may contain a water-soluble organic solvent. Examples of the water-soluble organic solvent include glycerin; glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, 1,3-propanediol, 1,2-butanediol, 1,2-pentanediol, 1,2-hexanediol, 1,4-butanediol, 1,5-pentanediol, and 1,6-hexanediol; ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, and propylene glycol monomethyl ether. Examples of the water-soluble organic solvent include glycol monoethers such as propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, and triethylene glycol monomethyl ether; nitrogen-containing solvents such as 2-pyrrolidone, N-methyl-2-pyrrolidone, and N-ethyl-2-pyrrolidone; and alcohols such as methanol, ethanol, n-propyl alcohol, isopropyl alcohol, n-butanol, 2-butanol, tert-butanol, iso-butanol, n-pentanol, 2-pentanol, 3-pentanol, and tert-pentanol. These water-soluble organic solvents may be used alone or in combination of two or more.

[0053] In order to more effectively and reliably achieve the effects of this embodiment, the content of the water-soluble organic solvent relative to the total amount of ink composition L is preferably 10% by mass or more and 30% by mass or less.

[0054] 2.4.Surfactants The ink composition L may contain a surfactant. Examples of the surfactant include acetylene glycol surfactants, fluorine-based surfactants, and silicone-based surfactants. The surfactant may be used alone or in combination of two or more.

[0055] Examples of acetylene glycol surfactants include 2,4,7,9-tetramethyl-5-decyne-4,7-diol and its alkylene oxide adducts, and 2,4-dimethyl-5-decyne-4-ol and its alkylene oxide adducts.

[0056] The acetylene glycol surfactant may be a commercially available product, such as Olfine (registered trademark) 104 series and E series (both trade names, manufactured by Nissin Chemical Industry Co., Ltd.); Surfynol (registered trademark) series (both trade names, manufactured by Air Products and Chemicals, Inc.).

[0057] Examples of fluorosurfactants include perfluoroalkyl sulfonates, perfluoroalkyl carboxylates, perfluoroalkyl phosphates, perfluoroalkyl ethylene oxide adducts, perfluoroalkyl betaines, and perfluoroalkyl amine oxide compounds. Commercially available fluorosurfactants can also be used. Examples of such commercially available products include S-144 and S-145 (both trade names, Asahi Glass Co., Ltd.).

[0058] Examples of silicone surfactants include polysiloxane compounds and polyether-modified organosiloxanes. Commercially available silicone surfactants can also be used. Examples of such commercially available products include BYK-306, BYK-307, BYK-333, BYK-341, BYK-345, BYK-346, BYK-347, BYK-348, and BYK-349 (all of which are product names, BYK Japan Co., Ltd.).

[0059] In order to more effectively and reliably achieve the effects of this embodiment, the content of the surfactant relative to the total amount of ink composition L is preferably 0.5% by mass or more and 5.0% by mass or less.

[0060] 2.5.Other Ingredients The ink composition L may contain various additives such as a dissolution aid, a viscosity adjuster, a pH adjuster, an antioxidant, a preservative, an antifungal agent, a corrosion inhibitor, and a chelating agent for capturing metal ions that affect dispersion. The additives may be used alone or in combination of two or more kinds.

[0061] The content of the additives is not particularly limited, but is preferably about 0.01% by mass or more and 5.0% by mass or less relative to the total amount of the ink composition L.

[0062] 3. Uses of the Inkjet Ink Composition The present invention has excellent storage stability even when heated, and suppresses ejection failure due to the generation of foreign matter. Therefore, the ink composition L is likely to be effective when using a disperse dye that is more likely to become foreign matter when heated than other dyes and pigments. In other words, it is suitable for a dyeing method using sublimation transfer. As a dyeing method using sublimation transfer, for example, there is a method in which printing is performed on a sheet-like transfer medium such as paper by an inkjet method using an inkjet recording device, and then the transfer medium is superimposed on a recording medium such as a fabric and sublimation transfer is performed by heating.

[0063] 3.1. Inkjet recording method The inkjet recording method, which is a dyeing method using sublimation transfer, includes a step of attaching the ink composition L to the recording surface of a first recording medium, a step of placing a second recording medium on the recording surface of the first recording medium, and a step of heating the first recording medium and the second recording medium. In other words, the sublimation transfer inkjet recording method includes an ink application step of applying the ink composition L to an intermediate transfer medium using an inkjet method, and a transfer step of heating the intermediate transfer medium to which the ink composition L has been applied in a state in which the surface to which the ink composition L has been applied faces the dyed surface of the dyed object, thereby transferring the disperse dye to the dyed object. This allows dyed objects to be produced with good productivity, and the sublimation transfer inkjet recording method can also be said to be a method for producing dyed objects. Each step will be described below.

[0064] 3.2. Ink application process In this step, the ink composition L is applied to the recording surface of the intermediate transfer medium, which is the first recording medium, by using an inkjet method. The ink composition L can be ejected by the inkjet method using a droplet ejection device. Examples of such a droplet ejection device include the inkjet recording device described above.

[0065] As a droplet ejection method in the inkjet method, a piezoelectric method or a method of ejecting the ink composition L by bubbles generated by heating the ink composition L can be used. Among these, the piezoelectric method is preferred from the viewpoint of the ink composition L being less likely to deteriorate.

[0066] As the intermediate transfer medium, for example, paper such as plain paper, a recording medium provided with an ink receiving layer, etc. can be used. The recording medium provided with the ink receiving layer is called, for example, inkjet paper, coated paper, etc. Among these, paper provided with an ink receiving layer containing inorganic particles such as silica is more preferable. This makes it possible to obtain an intermediate recorded matter in which bleeding, etc. is suppressed on the recording surface during the process in which the ink composition L applied to the intermediate transfer medium dries. In addition, with such a medium, the disperse dye is more easily retained on the surface of the recording surface, and the sublimation of the disperse dye can be more efficiently performed in the subsequent transfer process.

[0067] In this step, multiple ink compositions may be used. This can, for example, broaden the color gamut that can be expressed. One of the multiple ink compositions may be the ink composition L of this embodiment, or two or more of the multiple ink compositions may be the ink composition L of this embodiment.

[0068] 3.3.Transfer process Thereafter, the recording surface of the intermediate transfer medium to which the ink composition L has been applied is heated in a state in which it faces the article to be dyed, in other words, in a state in which the second recording medium is placed on the recording surface of the first recording medium, to transfer the disperse dye contained in the ink composition L to the article to be dyed. This results in a dyed article to which the disperse dye has been transferred.

[0069] In this step, the intermediate transfer medium to which the ink composition L has been applied may be heated while facing the object to be dyed. In this step, it is more preferable to heat the intermediate transfer medium and the object to be dyed while they are in close contact with each other. This allows, for example, a clearer image to be recorded, i.e., dyed, on the second recording medium.

[0070] As the substrate to be dyed, for example, fabrics such as hydrophobic fiber fabrics, and sheet-like objects such as resin films and plastic films are suitably used, but objects having three-dimensional shapes other than sheets, such as spherical shapes and rectangular parallelepiped shapes, may also be used.

[0071] The substrate may be made of resin and plastic, glass, metal, or ceramic. The fibers constituting the fabric as the substrate may be polyester fiber, nylon fiber, triacetate fiber, diacetate fiber, polyamide fiber, or a blend of two or more of these fibers. Blends of these fibers with regenerated fibers such as rayon or natural fibers such as cotton, silk, or wool may also be used.

[0072] Examples of resin films and plastic films to be dyed include polyester films, polyurethane films, polycarbonate films, polyphenylene sulfide films, polyimide films, and polyamideimide films. Such films may be laminates in which multiple layers are laminated, or may be made of a gradient material in which the composition of the material changes in a gradient manner.

[0073] The recording medium containing a fabric may be the fabric itself, but it is preferable that the fabric is pretreated with a pretreatment liquid containing resin particles. By pretreating the fabric, a recorded matter having better abrasion fastness tends to be obtained.

[0074] 4. Examples and Comparative Examples The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. In the following, "parts" and "%" are based on mass unless otherwise specified. The evaluation was performed under an environment of a temperature of 25.0°C and a relative humidity of 40.0%, unless otherwise specified.

[0075] 4.1. Preparation of Inkjet Ink Composition Using each coloring material shown in Tables 1 and 2, other components such as water, water-soluble organic solvent, and surfactant were placed in a container at 100% by mass, and mixed and stirred with a magnetic stirrer for 2 hours, and then dispersed in a bead mill filled with zirconia beads having a diameter of 0.3 mm to thoroughly mix. After stirring for 1 hour, the mixture was filtered using a 5.0 μm PTFE membrane filter to obtain ink compositions according to the Examples, Reference Examples, and Comparative Examples.

[0076] 4.2.Ink bottle The materials of the container body and the thermal conductivity (W / mK) of each ink bottle example are listed in Tables 1 and 2. In the tables, "PP" stands for polypropylene, "PE" stands for polyethylene, "PC" stands for polycarbonate, and "PET" stands for polyethylene terephthalate.

[0077] [Table 1]

[0078] [Table 2]

[0079] 4.3 Individual evaluations The following heat exposure conditions were carried out in advance for each evaluation. That is, 100 mL of the ink composition was filled into an empty ink bottle having the same shape as that shown in Figure 2 to prepare an ink bottle for each example. Next, the ink bottle was placed in the storage position and left for two weeks under conditions of a temperature of 40°C and a relative humidity of 20% RH.

[0080] 4.4. Evaluation of storage stability The ink bottle of each example was evaluated for the amount of foreign matter generated as an index of storage stability by the following filter clogging test. The ink composition from the ink bottle of each example was introduced into an inkjet printer (PX-G930, manufactured by Seiko Epson Corporation). More specifically, 100 mL of the ink composition in the ink bottle was supplied from the ink bottle to the recording head via a subtank in the printer. Then, the ink composition was ejected from the recording head to check the clogging state of a filter (made of SUS, mesh pore size 3.5 μm) installed in a supply pipe connecting the ink bottle and the subtank.

[0081] The clogging state of the filter was checked by checking the surface of the filter using a digital microscope VHX-900 (manufactured by Keyence Corporation) and counting the number of foreign objects captured by the filter. The number of foreign objects was evaluated according to the following criteria, and the results are shown in each table. A: There are no foreign objects, and the degree of foreign objects is good. B: The number of foreign objects is 1 or more and less than 10, and the degree of foreign objects is good. C: The number of foreign objects is 10 or more and less than 20, and the degree of foreign objects is good. D: The number of foreign bodies is 20 or more and less than 50, and the degree of foreign bodies is severe. E: The number of foreign bodies is 50 or more, and the degree of foreign bodies is severe.

[0082] 4.5.Evaluation of Settling Rate The ink composition was placed in the centrifuge tube, the lid, and the total mass of the ink composition was adjusted to 55 g, and the centrifuge tube was closed. The centrifuge tube with the lid was placed in a centrifuge (model "CR-20B2" manufactured by Hitachi Koki Co., Ltd., ROTOR NO. 36) and processed at a rotation speed of 10,000 rpm for 15 minutes, and then the supernatant liquid (5 g area from the air-liquid interface) was collected. The absorbance of the light at the peak wavelength of the supernatant liquid and the ink composition before centrifugation was measured. The ratio of the absorbance of the ink composition to the absorbance of the supernatant liquid was calculated and evaluated according to the following evaluation criteria. A: The supernatant concentration is 95% or more of the initial concentration, and the degree of sedimentation is good. B: The supernatant concentration is 90% or more and less than 95% of the initial concentration, and the degree of sedimentation is good. C: The supernatant concentration is 85% or more and less than 90% of the initial concentration, and the degree of sedimentation is good. D: The supernatant concentration is 80% or more and less than 85% of the initial concentration, and the degree of sedimentation is poor. E: The supernatant concentration is less than 80% of the initial concentration, and the degree of sedimentation is poor.

[0083] 4.6. Saturation Evaluation Using the ink composition, a solid pattern was printed on a transfer paper, which is an intermediate recording medium, using an inkjet printer (PX-G930, manufactured by Seiko Epson Corporation). The ink-attached surface of the transfer paper was superimposed on a polyester cloth, and then heat-treated at 200°C for 60 seconds using a transfer press machine TP-600A2 manufactured by Taiyo Seiki Co., Ltd., to perform sublimation transfer printing from the transfer paper to the polyester cloth. In this way, each test fabric was obtained.

[0084] The chroma of each test fabric was evaluated as an index of color development. The chroma was evaluated by measuring the DY value, which is the reflection density of yellow. The colorimeter used was SpectroLino, a product of GRETAG-MACBETH. A: The yellow density is 1.5 or more, and the yellow has high color development. B: The yellow density is 1.2 or more and less than 1.5, and the yellow is highly color-developing. C: The yellow density is 1.0 or more and less than 1.2, and the yellow is highly color-developable. D: The yellow density is 0.8 or more and less than 1.0, and the yellow has low color development. E: The yellow density is less than 0.8, and the yellow has low color development.

[0085] 4.7.Evaluation Results

[0086] In the ink bottles of the Examples, the generation of foreign matter was suppressed compared to the Comparative Examples. Also, in the ink bottles of the Examples 1, 2, and 5, which did not use a coloring material with a coumarin skeleton, the chroma was lower than in the ink bottles of the Examples 1 to 4, which used a coumarin skeleton.

[0087] Comparing Example 1 with Examples 5 and 6, it was found that the inclusion of a material with a thermal conductivity of 0.29 W / mK or less suppressed the generation of foreign matter. Comparing Example 1 with Comparative Examples 3, 4 and 6, it was found that the level of foreign matter generation was high when the material did not include a material with a thermal conductivity of 0.29 W / mK or less.

[0088] Comparing Example 1 with Examples 7 and 8, it was found that the generation of foreign matter can be further suppressed by further defining the film thickness of the ink bottle.

[0089] Comparison of Example 1 with Examples 9 and 10 reveals that the generation of foreign matter can be further suppressed by further specifying the volume of the ink composition contained. Similar results were obtained in comparisons of Example 8 with Examples 11 and 12, and in comparisons of Example 7 with Examples 13 and 14.

[0090] Comparing Example 1 with Examples 15 and 16, it was found that the generation of foreign matter was further suppressed by further defining the surface roughness of the inner surface of the ink bottle. Similar results were obtained by comparing Example 5 with Examples 17 and 18.

[0091] Furthermore, when the problem of suppressing foreign matter in the present invention was solved, a secondary effect was observed in the evaluation of sedimentation. Sedimentation showed a tendency to improve in the same way as suppressing foreign matter. This is presumably because suppressing the generation of foreign matter suppresses the increase in the particle size of the dye during heating. The results of the sedimentation evaluation showed exactly the same tendency as the results of suppressing foreign matter. [Explanation of symbols]

[0092] 10,110,120,130,140,150...ink bottle as ink package, 12...container body, 14...spout, 16,60...sealing body, 21...container chamber, 22...container section, 23...neck section, 24...first male thread, 25...pair of outer surfaces, 25d...distance, 26...outlet, 27...inner surface, 29...large diameter section, 30...small diameter section, 31...first female thread, 40...packing, 50...cap, L...ink composition.

Claims

1. an ink-jet ink composition; a storage section that stores the ink-jet ink composition, the ink-jet ink composition comprises a colorant having a coumarin skeleton and water; The housing portion includes a material having a thermal conductivity of 0.29 W / mK or less, an inner surface of the container that faces the ink-jet ink composition and an outer surface that is exposed to the outside world; , the thickness is 200 μm or more, The ink package, wherein the inner surface has a surface roughness of 40 rsm or more.

2. The ink-jet ink composition according to claim 1 , wherein the volume of the ink-jet ink composition contained is 100 ml or more.

2. The ink package according to claim 1.

3. The material is polypropylene, polyethylene terephthalate, or polycarbonate.

3. The ink package according to claim 1, wherein the ink is a liquid.

4. 2. The method according to claim 1 , further comprising: The ink package according to any one of claims 1 to 3.

5. In terms of external shape, the device has a pair of outer surfaces opposed to each other; 5. Any one of claims 1 to 4, wherein the distance between the pair of outer surfaces is 3.5 cm or less.

2. The ink package according to claim 1.

6. The coloring material is C.I. Disperse Yellow 82, C.I. Disperse Yellow 23 2. The ink according to claim 1 , Package.

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