Ink composition, printed material, inkjet recording device, recording method, and method for producing printed material

Abstract

To provide an ink composition that exhibits excellent dischargeability even when ejected by the inkjet method, capable of producing a printed material with excellent metallic gloss.SOLUTION: An active energy ray-curable ink composition, discharged by the inkjet technique, contains a polymerizable compound and a luminescent pigment. For the luminescent pigment, the relationship between the volume-based cumulative 10% particle diameter (D10) (μm), the volume-based cumulative 50% particle diameter (D50) (μm), and the volume-based cumulative 90% particle diameter (D90) (μm) satisfies the relationship represented by the following formula (I): (D90-D10) / D50≤2 (I).SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an active energy ray-curable ink composition for glittering decorative printing, which is mainly ejected by an inkjet method. [Background technology]

[0002] Conventionally, images having a metallic tone have been expressed on a substrate such as a printed matter having a colored layer formed on a part or the entire surface of a substrate (recording medium). Methods for imparting such metallic gloss include application of ink using metal powder made from brass, aluminum fine particles, etc., foil stamping using metal foil, and thermal transfer method using metal foil.

[0003] In recent years, in addition to the above-mentioned method of forming a coating film having metallic luster, many examples of application to inkjet printing methods have been seen, one of which is glittering decorative printing. Glittering decorative printing using the inkjet method is mainly performed using an inkjet printer or the like.

[0004] For example, Patent Document 1 discloses an ink composition containing a glittering pigment, a predetermined amount of a radically polymerizable compound, and a polymerization initiator. Patent Document 1 describes that this ink composition has excellent curing properties and can provide printed matter having a metallic gloss that is compatible with excellent flexibility and high film hardness.

[0005] Patent Document 2 discloses an ink composition containing a specific glittering pigment, an organic solvent, a photopolymerizable compound, and a photopolymerization initiator. Patent Document 2 describes that this ink composition is capable of forming a coating film with good metallic luster. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2012-31284 A [Patent Document 2] JP 2017-2162 A Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide an ink composition capable of producing a printed matter having a good metallic gloss, and also to provide an active energy ray-curable ink composition having good ejection properties even when ejected by an inkjet method. [Means for solving the problem]

[0008] As a result of intensive research into solving the above problems, the present inventors have found that the above problems can be solved by an actinic ray-curable ink composition in which the particle size of the brilliant pigment is within a predetermined range, and have thus completed the present invention.

[0009] (1) An active energy ray-curable ink composition that is ejected by an inkjet method, the ink composition comprising a polymerizable compound and a photoluminescent pigment, wherein a relationship among a volume-based cumulative 10% particle diameter (D10) (μm), a volume-based cumulative 50% particle diameter (D50) (μm), and a volume-based cumulative 90% particle diameter (D90) (μm) of the photoluminescent pigment satisfies the relationship of the following formula (I): (D90-D10) / D50 ≦ 2 (I)

[0010] (2) The ink composition according to (1), further comprising a polymerization initiator, the polymerization initiator comprising a sulfur-containing polymerization initiator.

[0011] (3) The polymerizable compound is The ink composition according to (1) or (2), which contains a hydrophobic (meth)acrylate polymerizable compound having a surface tension of 35 mN / m or more.

[0012] (4) The ink composition according to any one of (1) to (3), wherein the polymerizable compound contains a monofunctional polymerizable compound and a polyfunctional polymerizable compound having two or more functional groups.

[0013] (5) The ink composition according to any one of (1) to (4), wherein the luster pigment contains a metal-containing luster pigment.

[0014] (6) The ink composition according to any one of (1) to (5), wherein the polymerizable compound contains an aromatic polymerizable compound.

[0015] (7) A printed matter having the ink composition according to any one of (1) to (6) printed on the surface of a substrate.

[0016] (8) An ink jet recording device comprising a storage mechanism filled with the ink composition according to any one of (1) to (6).

[0017] (9) A recording method comprising ejecting the ink composition according to any one of (1) to (6) above by an inkjet method.

[0018] (10) A method for producing a printed matter, comprising ejecting the ink composition according to any one of (1) to (6) by an inkjet method to produce a printed matter. Effect of the Invention

[0019] According to the present invention, even if an active energy ray-curable ink composition containing a glittering pigment is used, it is possible to produce a printed matter having excellent inkjet ejection properties and good gloss. [Brief description of the drawings]

[0020] [Figure 1] FIG. 2 is a schematic diagram showing the measurement angle of L* (lightness index) in the L*a*b* color system in gloss evaluation in the examples. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Specific embodiments of the present invention will be described in detail below, but the present invention is not limited to the following embodiments and can be modified as appropriate within the scope of the object of the present invention. In this specification, "A≦B" means that A is equal to B, or A is smaller than B (B is larger than A).

[0022] 1. Active energy ray-curable ink composition The active energy ray curable ink composition according to the present embodiment is an active energy ray curable ink composition discharged by an ink jet method. This ink composition contains a polymerizable compound and a glittering pigment, and when the ink composition is irradiated with active energy rays, a glittering layer containing the glittering pigment is formed on the surface of the substrate, and a glittering layer having metallic luster can be formed on the substrate. In this specification, the substrate may be the surface of a recording medium itself, or a recording medium having a colored layer, a primer layer, or an overcoat layer formed on a part or the entire surface of the recording medium, and is not particularly limited. In addition, as will be described in detail later, in this specification, the term "colored layer" refers to a layer containing a coloring material (dye or pigment) that is used in a normal ink composition other than the glittering pigment.

[0023] In addition, in this specification, a "layer" does not necessarily have to be a layer of uniform thickness, but may be a layer of approximately uniform thickness, or a layer of non-uniform thickness with an uneven shape.

[0024] The ink composition is characterized in that the relationship among the volume-based cumulative 10% particle diameter (D10) (μm), the volume-based cumulative 50% particle diameter (D50) (μm), and the volume-based cumulative 90% particle diameter (D90) (μm) of the brilliant pigment contained in the ink composition satisfies the relationship of the following formula (I).

[0025] (D90-D10) / D50 ≦ 2 (I)

[0026] By using an active energy ray-curable ink composition containing a glittering pigment that satisfies the above-mentioned properties, it is possible to produce a printed matter having excellent inkjet ejection properties and good gloss.

[0027] In this specification, the volume-based cumulative 10% particle size (D10) means the particle size (μm) that is the cumulative 10% calculated from the small diameter side in the volume-based cumulative particle size distribution, the volume-based cumulative 50% particle size (D50) (μm) means the particle size (μm) that is the cumulative 50% calculated from the small diameter side, and the volume-based cumulative 90% particle size (D90) means the particle size (μm) that is the cumulative 90% calculated from the small diameter side. In addition, the volume-based cumulative 50% particle size (D50) may also be called the "volume average particle size", "average particle size", or "median (median) size". Hereinafter, each particle size may be simply referred to as "D10", "D50", or "D90".

[0028] Hereinafter, each component contained in the ink composition according to this embodiment will be described.

[0029] [Photoluminescent pigment] The luster pigment has a function of imparting metallic gloss to the substrate. Examples of the luster pigment include those containing pearl pigments and metal-containing luster pigments. By using an ink composition containing such a luster pigment, it is possible to form a luster layer having metallic gloss on the substrate.

[0030] Among the luster pigments, it is preferable that the luster pigment contains a metal-containing luster pigment. This makes it possible to more suitably impart metallic luster to the substrate. When the luster pigment contains a metal-containing luster pigment, the content of the metal-containing luster pigment is more preferably 30% by mass or more, more preferably 50% by mass or more, even more preferably 70% by mass or more, and even more preferably 90% by mass or more of the total amount of the luster pigment. In particular, it is particularly preferable that the luster pigment is composed only of a metal-containing luster pigment.

[0031] Examples of pearl pigments include pigments having pearlescent or interference luster, such as mica, fish scale leaf, bismuth oxychloride, silicon dioxide, metal oxides, metal compounds, and laminates thereof.

[0032] Examples of metals contained in the metal-containing luster pigment include simple metals such as aluminum, silver, gold, nickel, chromium, tin, zinc, indium, titanium, copper, and iron; metal compounds; alloys and at least one of the mixtures thereof, and oxides of these metals. As the metal-containing luster pigment, it is preferable to use one containing any of aluminum, nickel, indium, and silver. By using one containing any of aluminum, nickel, indium, and silver (including alloys) as the luster pigment, it is possible to impart a more suitable metallic luster to the substrate. In particular, aluminum is preferable because it is less expensive and easier to process than other metals. The ink composition according to the present embodiment can be made to have excellent dischargeability by the inkjet method while enjoying the effect of being able to form a luster layer having a more suitable metallic luster to the substrate.

[0033] The ink composition according to this embodiment is characterized in that the relationship among the volume-based cumulative 10% particle diameter (D10) (μm), the volume-based cumulative 50% particle diameter (D50) (μm), and the volume-based cumulative 90% particle diameter (D90) (μm) of the brilliant pigment satisfies the relationship of the following formula (I).

[0034] (D90-D10) / D50 ≦ 2 (I)

[0035] The present inventors have found that by satisfying the above, the ink jet ejection properties of the ink composition containing the glittering pigment are improved. Ink compositions containing glittering pigments may experience insufficient transmission of pressure applied to eject the ink inside the inkjet head (also known as pressure loss), resulting in poor ejection properties of the ink composition or ejection defects due to glittering pigments with large particle sizes clogging the inkjet nozzle or the filter inside the inkjet head.

[0036] The present inventors have found that ejection properties are stable when the relationship among the volume-based cumulative 10% particle diameter (D10) (μm), the volume-based cumulative 50% particle diameter (D50) (μm), and the volume-based cumulative 90% particle diameter (D90) (μm) of the brilliant pigment contained in the ink composition satisfies the relationship of the following formula (I).

[0037] The D10, D50, D90 and thickness of the metal-containing luster pigment can be measured using, for example, an "FPIA-3000S" manufactured by Sysmex Corporation, a laser diffraction particle size distribution meter "SALD 7500nano" manufactured by Shimadzu Corporation, a scanning electron microscope (SEM), a transmission electron microscope (TEM), or the like.

[0038] In formula (I), (D90-D10) / D50 is preferably 1.8 or less, more preferably 1.6 or less, even more preferably 1.5 or less, and even more preferably 1.4 or less, which can further improve the ejection stability of the ink composition.

[0039] In the formula (I), (D90-D10) / D50 is preferably 0.1 or more, more preferably 0.3 or more, and even more preferably 0.5 or more.

[0040] In formula (I), (D90-D10) / D50 is preferably 0.1 or more and 1.8 or less, more preferably 0.3 or more and 1.6 or less, even more preferably 0.5 or more and 1.5 or less, and even more preferably 0.5 or more and 1.4 or less.

[0041] D90 is preferably 5.0 μm or less, more preferably 4.5 μm or less, even more preferably 4.0 μm or less, and even more preferably 3.8 μm or less.

[0042] D90 is preferably 0.5 μm or more, more preferably 0.8 μm or more, and even more preferably 1.0 μm or more.

[0043] D90 is preferably 0.5 μm or more and 5.0 μm or less, more preferably 0.8 μm or more and 4.5 μm or less, even more preferably 1.0 μm or more and 4.0 μm or less, and even more preferably 1.0 μm or more and 3.8 μm or less.

[0044] D50 is preferably 0.02 μm or more, more preferably 0.3 μm or more, and even more preferably 0.6 μm or more.

[0045] D50 is preferably 4.0 μm or less, more preferably 3.5 μm or less, even more preferably 3.0 μm or less, and even more preferably 2.5 μm or less.

[0046] D50 is preferably 0.02 μm or more and 4.0 μm or less, more preferably 0.3 μm or more and 3.5 μm or less, and even more preferably 0.6 μm or more and 2.9 μm or less.

[0047] In addition, the shape of the glittering pigment is not particularly limited, but it is preferable that the glittering pigment is flat (also expressed as fine plate-like, scale-like, etc.). With such a shape, a glittering layer having high glossiness can be formed on the substrate. On the other hand, an ink composition containing a flat glittering pigment will cause the pressure applied to eject the ink in the inkjet head to be transmitted more insufficiently, resulting in a relatively prominent problem of ejection failure. On the other hand, if the ink composition according to the present embodiment contains a glittering pigment whose volume-based cumulative 10% particle size (D10) (μm), volume-based cumulative 50% particle size (D50) (μm), and volume-based cumulative 90% particle size (D90) (μm) are within a predetermined range, it is possible to enjoy the effect of forming a glittering layer having high glossiness on the substrate while avoiding the problem of ejection failure caused by an ink composition containing a flat glittering pigment.

[0048] In the case of a flat metal-containing luster pigment, the thickness of the metal-containing luster pigment is preferably 5.0 nm or more, more preferably 10.0 nm or more, even more preferably 20.0 nm or more, and even more preferably 25.0 nm or more. The thickness of the metal-containing luster pigment is preferably 1.0 μm or less, more preferably 500 nm or less, even more preferably 200 nm or less, and even more preferably 100 nm or less. The thickness of the metal-containing luster pigment is preferably 5.0 nm or more and 1.0 μm or less, more preferably 10.0 nm or more and 500 nm or less, even more preferably 20.0 nm or more and 200 nm or less, and even more preferably 25.0 nm or more and 100 nm or less.

[0049] The content of the glittering pigment contained in the non-aqueous ink composition according to the present embodiment is not particularly limited, but the lower limit of the glittering pigment content is preferably 0.3 mass% or more, more preferably 0.6 mass% or more, and even more preferably 0.8 mass% or more, based on the total amount of the ink composition. This makes it possible to impart a more suitable metallic gloss to the substrate. The upper limit of the glittering pigment content is not particularly limited, but is preferably 5.0 mass% or less, more preferably 4.5 mass% or less, and even more preferably 4.0 mass% or less, based on the total amount of the ink composition. This makes it possible to improve the dispersibility of the glittering pigment in the ink composition or dispersion, and to improve the ejection stability of the inkjet.

[0050] The luster pigments can be obtained by mechanically shaping the metal-containing particles, for example by grinding in a ball mill or attrition mill. The metal-containing particles can also be obtained by known atomization methods.

[0051] In addition, as another method for producing a glittering pigment, it is also possible to finely pulverize a metal-containing thin film formed on a substrate. For example, a method of forming a metal-containing thin film of about 5.0 nm to 3.0 μm on a flat substrate coated with a peelable resin layer by vacuum deposition, ion plating, sputtering, or the like, peeling the metal-containing thin film from the substrate, and finely pulverizing it is possible to mention. The term metal-containing thin film is used in a concept that includes a thin film containing a metal compound such as a metal oxide. The lower limit of the thickness of the metal-containing thin film is preferably 5.0 nm or more, more preferably 10.0 nm or more, and even more preferably 15.0 nm or more. The upper limit of the thickness of the metal-containing thin film is preferably 5.0 μm or less, more preferably 3.0 μm or less, and even more preferably 1.0 μm or less.

[0052] Specific examples of substrates used in the production of bright pigments include polytetrafluoroethylene films, polyethylene films, polypropylene films, polyester films such as polyethylene terephthalate, polyamide films such as nylon 66 and nylon 6, polycarbonate films, triacetate films, and polyimide films. A preferred substrate is a film of polyethylene terephthalate or a copolymer thereof.

[0053] The lower limit of the preferred thickness of the substrate used in the production of the glittering pigment is not particularly limited, but is preferably 10 μm or more, more preferably 15 μm or more, and even more preferably 20 μm or more. The thickness of the substrate is 10 μm or more, which improves the handleability. The upper limit of the preferred thickness of the sheet-like substrate is not particularly limited, but is preferably 150 μm or less, more preferably 145 μm or less, and even more preferably 140 μm or less. The thickness of the substrate is 150 μm or less, which improves the flexibility of the printed matter, making it easy to roll and peel. The preferred thickness range of the substrate used in the production of the glittering pigment is preferably 10 μm or more and 150 μm or less, more preferably 15 μm or more and 145 μm or less, and even more preferably 20 μm or more and 140 μm or less.

[0054] Specific examples of the resin used in the peelable resin layer applied to the substrate include polyvinyl alcohol, polyvinyl butyral, polyethylene glycol, polyacrylic acid, polyacrylamide, cellulose derivatives, polyvinyl acetal, acrylic acid copolymers, and modified nylon resins. To make the resin used in the peelable resin layer into a resin layer, the resin solution is applied to the sheet-like substrate by gravure coating, roll coating, blade coating, extrusion coating, dip coating, spin coating, or the like to form the peelable resin layer.

[0055] The lower limit of the thickness of the peeling resin layer is not particularly limited, but is preferably 0.1 μm or more, more preferably 0.3 μm or more, and even more preferably 0.5 μm or more. By being 0.1 μm or more, it is possible to easily peel the metal-containing thin film from the substrate. The upper limit of the thickness of the peeling resin layer is not particularly limited, but is preferably 50 μm or less, more preferably 30 μm or less, and even more preferably 10 μm or less. By being 50 μm or less, it is possible to easily peel the metal-containing thin film from the substrate. The thickness of the peeling resin layer is preferably 0.1 μm or more and 50 μm or less, more preferably 0.3 μm or more and 30 μm or less, and even more preferably 0.5 μm or more and 10 μm or less.

[0056] In addition, an ink composition or a dispersion liquid used for producing an ink composition may be produced from the substrate on which the metal-containing thin film is formed. The substrate may be immersed in a solvent that can dissolve the peeling resin and does not react with the glittering pigment, or ultrasonic treatment may be performed simultaneously with the immersion. Examples of such a solvent include a polymerizable compound or solvent that constitutes the ink composition. The peeling resin functions as a dispersant that disperses the glittering pigment, improving the dispersibility of the glittering pigment. In this case, the particle size and film thickness of the glittering pigment are adjusted according to the conditions when the metal-containing thin film is formed and the ultrasonic dispersion time. The glittering pigment may be recovered by sedimenting and separating the glittering pigment from the peeling resin solution by centrifugation, and the glittering pigment may be dispersed in the polymerizable compound or solvent that constitutes the ink composition.

[0057] A protective layer may be formed (coated) on the surface of the glittering pigment. The protective layer is preferably a non-metallic protective layer. Examples of the non-metallic protective layer include layers made of hydrophobic compounds such as resins and fatty acid compounds. Examples include fatty acids, fatty acid esters, aromatic carboxylic acids, aromatic carboxylic acid esters, phosphate esters, silicon-containing polymers, fluorine-containing polymers, polyester resins, acrylic resins, epoxy resins, urethane resins, and cellulose ester resins. In particular, when the glittering pigment contains aluminum, the protective layer is preferably made of a hydrophobic compound. Examples of the hydrophobic compound include compounds that have structures such as alkyl groups having 4 or more carbon atoms, aromatic groups, and trifluoro groups, and are insoluble in water, and the above-mentioned resins. By forming a protective layer on the surface of the glittering pigment, it is possible to suppress oxidation of the glittering pigment, resulting in an ink composition with high storage stability.

[0058] In this case, the particle size of the metal-containing luster pigment is controlled so that (D90-D10) / D50 is not more than 2. Methods for obtaining a metal-containing luster pigment having such a particle size relationship include, for example, a method in which the particle size is controlled by controlling the time and output when irradiating a dispersion containing the metal-containing luster pigment with ultrasound, a method in which metal-containing luster pigment having a particle size equal to or larger than a predetermined particle size is removed by centrifugation or by passing through a filter, and a combination of these methods.

[0059] The non-aqueous ink composition according to this embodiment may contain a coloring material other than the glittering pigment.

[0060] [Pigment dispersant] In the active energy ray-curable ink composition according to the present embodiment, a pigment dispersant may be used as necessary. Any pigment dispersant used in ink compositions may be used as the pigment dispersant. A polymer dispersant may be used as the pigment dispersant. Such pigment dispersants have a main chain made of a polyester, polyacrylic, polyurethane, polyamine, polycaprolactone, or the like, and have a polar group such as an amino group, a carboxyl group, a sulfone group, or a hydroxyl group as a side chain. Examples of polyacrylic dispersants include Disperbyk-2000, 2001, 2008, 2009, 2010, 2020, 2020N, ​​2022, 2025, 2050, 2070, 2095, 2150, 2151, 2155, 2163, 2164, BYKJET-9130, 9131, 9132, 9133, 9151 (manufactured by BYK-Chemie), Efka PX4310, PX4320, PX4330, PA4401, 4402, PA4403, 4570, 7411, 7477, PX4700, PX4701 (manufactured by BASF), and TREPLUS. D-1200, D-1410, D-1420, MD-1000 (manufactured by Otsuka Chemical Co., Ltd.), Florene DOPA-15BHFS, 17HF, 22, G-700, 900, NC-500, GW-1500 (manufactured by Kyoeisha Chemical Co., Ltd.), etc. are used. Examples of polycaprolactone-based dispersants include AJISPER PB821, PB822, and PB881 (manufactured by Ajinomoto Fine-Techno Co., Ltd.), Hinoact KF-1000, T-6000, T-7000, T-8000, T-8000E, and T-9050 (manufactured by Kawaken Fine Chemical Co., Ltd.), Solsperse 20000, 24000, 32000, 32500, 32550, 32600, 33000, 33500, 34000, 35200, 36000, 37500, 39000, 71000, 76400, 76500, 86000, 88000, J180, and J200 (manufactured by Lubrizol Corporation), and TEGO Dispers 652, 655, 685, 688, 690 (manufactured by Evonik Japan), etc. are used.Preferred dispersants include PB881, BYKJET-9130, 9131, 9132, 9133, 9151, Efka PX4310, PX4320, PX4330, PX4700, PX4701, Solsperse 20000, 24000, 32000, 33000, 33500, 34000, 35200, 39000, 71000, 76500, 86000, 88000, J180, J200, TEGO Dispers 655, 685, 688, and 690. These may be used alone or in mixtures thereof.

[0061] The content of the pigment dispersant is not particularly limited, but the lower limit of the content of the pigment dispersant is preferably 5 parts by mass or more, more preferably 15 parts by mass or more, and even more preferably 20 parts by mass or more, relative to 100 parts by mass of the glittering pigment in the ink composition. The upper limit of the content of the pigment dispersant is preferably 150 parts by mass or less, more preferably 125 parts by mass or less, and even more preferably 100 parts by mass or less, relative to 100 parts by mass of the glittering pigment in the ink composition. This makes it possible to effectively disperse the glittering pigment in the ink composition, and improve the ejection properties of the ink composition.

[0062] [Polymerizable compound] The polymerizable compound is a compound having an ethylenically unsaturated double bond that is polymerized by irradiation with active energy rays, which include electromagnetic waves such as far ultraviolet rays, ultraviolet rays, near ultraviolet rays, visible light rays, infrared rays, X-rays, and gamma rays.

[0063] The polymerizable compound may be a monofunctional polymerizable compound having one ethylenically unsaturated double bond in the compound, or a polyfunctional polymerizable compound having two or more ethylenically unsaturated double bonds in the compound. The polymerizable compound is a concept that includes not only monomers but also compounds that are called oligomers or polymers depending on their molecular weight.

[0064] Examples of the monofunctional polymerizable compound include tetrahydrofurfuryl (meth)acrylate (THFA), cyclic trimethylolpropane formal (meth)acrylate (CTFA), (2-methyl-2-ethyl-1,3-dioxolan-4-yl) (meth)acrylate, (2-methyl-2-isobutyl-1,3-dioxolan-4-yl) (meth)acrylate, (cyclohexanespiro-2-(1,3-dioxolan-4-yl)) (meth)acrylate, 4-t-butylcyclohexyl (meth)acrylate which is an alkylcycloalkyl acrylate, n -butylcyclohexyl (meth)acrylate, benzyl (meth)acrylate, phenoxyethyl (meth)acrylate, isobornyl (meth)acrylate, dicyclopentanyl (meth)acrylate, dicyclopentenyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, γ-butyrolactone (meth)acrylate, cresol (meth)acrylate, 2-acryloyloxyethyl phthalate, 2-acryloyloxyethyl-2-hydroxyethyl phthalate, 2-acryloyloxyethyl hexahydrophthalate, 2-Acryloyloxypropyl phthalate, paracumylphenoxyethylene glycol (meth)acrylate, nonylphenoxypolyethylene glycol (meth)acrylate, 1-adamantyl (meth)acrylate, cyclohexyl (meth)acrylate, cyclooctyl (meth)acrylate, hydroxycyclohexyl (meth)acrylate, 3-3-5-trimethylcyclohexyl (meth)acrylate, 2-hydroxy-3-phenoxypropyl (meth), N-vinylpyrrole acrylate, acryloylmorpholine, N-vinylcaprolactone methacrylate, imide (meth)acrylate, isooctyl (meth)acrylate, tridecyl (meth)acrylate, lauryl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, stearyl (meth)acrylate, isodecyl (meth)acrylate, caprolactone (meth)acrylate, methoxypolyethylene glycol (meth)acrylate, methoxypolypropylene glycol (meth)acrylate, 2-methoxyethyl (meth)acrylate, ethyl carbitol (meth)acrylate, 2-ethylhexyl (meth)acrylate,Vinylcyclohexane, tert-butyl-4-ethynylcyclohexane, cycloheptyl (meth)acrylate, cyclopentyl (meth)acrylate, cyclobutyl (meth)acrylate, phenyl (meth)acrylate, styrene, N-vinylpyrrolidone, N-vinyloxazolidone, 2-vinyl-2-oxazoline N-vinylpyridine, N-vinylimidazole, 2-isopropenyl-2-oxazoline, methyl (meth)acrylate, butyl (meth)acrylate, ethyl (meth)acrylate, isobutyl (meth)acrylate, tert-butyl (meth)acrylate, trifluoroethyl (meth)acrylate, dimethylacrylamide, diethylacrylamide, hydroxyethylacrylamide, isopropylacrylamide, 3-hydroxypropylacrylamide, ethyl methacrylate ... Examples of the monomers include propyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxyethyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, methyl α-(hydroxymethyl) (meth)acrylate, ethyl α-(hydroxymethyl) (meth)acrylate, n-butyl α-(hydroxymethyl) (meth)acrylate, dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate, N-vinyl succinimide, N-vinyl methyl carbamate, N,N-methyl vinyl acetamide, (meth)acryloyloxyethyl trimethyl ammonium chloride, (meth)acrylonitrile, and acrylates modified with various modifications such as alkoxy modification and caprolactone modification. These other monomers may be used alone or in combination. In addition, "(meth)acrylate" means both "acrylate" and "methacrylate".

[0065] Examples of polyfunctional monomers include ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, hexanediol di(meth)acrylate, long-chain aliphatic di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, ethylene oxide-modified (EO-modified) 1,6-hexanediol di(meth)acrylate (2), and 1,6-hexanediol. Ethylene oxide modified di(meth)acrylate (EO modified) (3), 1,6-hexanediol di(meth)acrylate ethylene oxide modified (EO modified) (5), 1,6-hexanediol di(meth)acrylate propionoxide modified (PO modified) (2), 1,6-hexanediol di(meth)acrylate propionoxide modified PO modified (PO modified) (3), 1,9-nonanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, ethylene oxide modified neopentyl glycol di(meth)acrylate Ethylene oxide modified EO modified (EO modified) (2), Ethylene oxide modified EO modified (EO modified) of neopentyl glycol di(meth)acrylate (3), Propion oxide modified PO modified (PO modified) of neopentyl glycol di(meth)acrylate (2), Propion oxide modified PO modified (PO modified) of neopentyl glycol di(meth)acrylate (8), Propion oxide modified PO modified (PO modified) of neopentyl glycol di(meth)acrylate (16), Hydroxypivalic acid neopentyl glycol di(meth)acrylate acrylate, caprolactone-modified neopentyl glycol di(meth)acrylate hydroxypivalate (2), caprolactone-modified neopentyl glycol di(meth)acrylate hydroxypivalate (4), polyalkylene glycol diacrylate, ethylene oxide-modified (EO-modified) polyalkylene glycol diacrylate (4), ethylene oxide-modified (EO-modified) polyalkylene glycol diacrylate (9), ethylene oxide-modified (EO-modified) polyalkylene glycol diacrylate (14),Polyalkylene glycol diacrylates modified with ethylene oxide (EO) (23), Polyalkylene glycol diacrylates modified with ethylene oxide (EO) (46), Polyalkylene glycol diacrylates modified with propion oxide (PO) (3), Polyalkylene glycol diacrylates modified with propion oxide (PO) (7), Polyalkylene glycol diacrylates modified with propion oxide (PO) (12), Polyalkylene glycol diacrylates modified with ethylene oxide and propion ethylene oxide and propion oxide modified polyalkylene glycol diacrylates (PO modified (12) & EO modified (6)), ethylene oxide and propion oxide modified polyalkylene glycol diacrylates (PO modified (6) & EO modified (12)), ethylene oxide and propion oxide modified polyalkylene glycol diacrylates (PO modified (4) & EO modified (12)), ethylene oxide and propion oxide modified polyalkylene glycol diacrylates (PO modified (4) & EO modified (17)), ethylene oxide and propion oxide modified polyalkylene glycol diacrylates Polyalkylene glycol diacrylate butylene oxide modified (BO modified) (3.5), Polyalkylene glycol diacrylate butylene oxide modified (BO modified) (9), Polyalkylene glycol diacrylate butylene oxide modified (BO modified) (14), Stearic acid modified pentaerythritol di(meth)acrylate, Propylene glycol di(meth)acrylate, Glycerol di(meth)acrylate, Triethylene glycol di(meth)acrylate acrylate, 2-(2-vinyloxyethoxy)ethyl acrylate, tetraethylene glycol di(meth)acrylate, tetramethylene glycol di(meth)acrylate, butylene glycol di(meth)acrylate, propoxylated neopentyl glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene di(meth)acrylate, triglycerol di(meth)acrylate, neopentyl glycol modified trimethylolpropane di(meth)acrylate, allylated cyclohexyl di(meth)acrylate,Methoxylated cyclohexyl di(meth)acrylate, acrylated isocyanurate, bis(acryloxyneopentyl glycol) adipate, bisphenol A di(meth)acrylate, ethylene oxide modified (EO modified) bisphenol A di(meth)acrylate (2), ethylene oxide modified (EO modified) bisphenol A di(meth)acrylate (3), ethylene oxide modified (EO modified) bisphenol A di(meth)acrylate (4), ethylene oxide modified (EO) bisphenol A di(meth)acrylate Modified) (10), ethylene oxide modified bisphenol A di(meth)acrylate (EO modified) (20), ethylene oxide modified bisphenol A di(meth)acrylate (EO modified) (30), propionoxide modified bisphenol A di(meth)acrylate (PO modified) (3), ethylene oxide and propionoxide modified bisphenol A di(meth)acrylate (PO modified (6) & EO modified (3)), tetrabromobisphenol A di(meth)acrylate, bisphenol S di(meth)acrylate, butadiene Diol di(meth)acrylate, phthalic acid di(meth)acrylate, phosphoric acid di(meth)acrylate, zinc di(meth)acrylate, pentaerythritol tetra(meth)acrylate, ethylene oxide modified (EO modified) pentaerythritol tetra(meth)acrylate (4), ethylene oxide modified (EO modified) pentaerythritol tetra(meth)acrylate (35), propionate modified (PO modified) pentaerythritol tetra(meth)acrylate (4), pentaerythritol tetra(meth)acrylate propionoxide-modified (PO-modified) acrylate (10), ditrimethylolpropane tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, ethylene oxide-modified (EO-modified) dipentaerythritol hexa(meth)acrylate (6), ethylene oxide-modified (EO-modified) dipentaerythritol hexa(meth)acrylate (12), ethylene oxide-modified (EO-modified) dipentaerythritol hexa(meth)acrylate (18),Dipentaerythritol hexa(meth)acrylate modified with ethylene oxide (EO modified) (24), dipentaerythritol hexa(meth)acrylate modified with ethylene oxide (EO modified) (48), dipentaerythritol hexa(meth)acrylate modified with propionate oxide (PO modified) (6), dipentaerythritol hexa(meth)acrylate modified with caprolactone (2), dipentaerythritol hexa(meth)acrylate modified with caprolactone (3), dipentaerythritol hexa(meth)acrylate caprolactone modified dipentaerythritol hexa(meth)acrylate (6), caprolactone modified dipentaerythritol hexa(meth)acrylate (12), trimethylolpropane tri(meth)acrylate, ethylene oxide modified trimethylolpropane tri(meth)acrylate (3), ethylene oxide modified trimethylolpropane tri(meth)acrylate (EO modified) (6), ethylene oxide modified trimethylolpropane tri(meth)acrylate (EO modified) (9), ethylene oxide modified trimethylolpropane tri(meth)acrylate Oxide modified (EO modified) (15), Ethylene oxide modified trimethylolpropane tri(meth)acrylate (EO modified) (20), Ethylene oxide modified trimethylolpropane tri(meth)acrylate (EO modified) (30), Propion oxide modified trimethylolpropane tri(meth)acrylate (PO modified) (3), Propion oxide modified trimethylolpropane tri(meth)acrylate (PO modified) (6), Pentaerythritol tri(meth)acrylate, Glycerin tri(meth)acrylate , ethylene oxide modified (EO modified) of glycerin tri(meth)acrylate (3), ethylene oxide modified (EO modified) of glycerin tri(meth)acrylate (6), ethylene oxide modified (EO modified) of glycerin tri(meth)acrylate (9), ethylene oxide modified (EO modified) of glycerin tri(meth)acrylate (20), propion oxide modified (PO modified) of glycerin tri(meth)acrylate (3), propion oxide modified (PO modified) of glycerin tri(meth)acrylate (5.5),Examples of such compounds include propionoxide-modified (PO-modified) glycerin tri(meth)acrylate (6), propionoxide-modified (PO-modified) glycerin tri(meth)acrylate (9), dimethylol tricyclodecane diacrylate, and (meth)acrylates having different numbers of modifications, different types of modifications, and different structures.

[0066] Among these polymerizable compounds, those containing a monofunctional polymerizable compound and a difunctional or higher polyfunctional polymerizable compound are preferable, which can provide favorable curability for the glossy layer (cured film) formed from the ink composition.

[0067] When the polymerizable compound contains a monofunctional polymerizable compound and a polyfunctional polymerizable compound having two or more functionalities, the content of the polyfunctional polymerizable compound contained in the polymerizable compound is preferably 5% by mass or more, more preferably 8% by mass or more, and even more preferably 10% by mass or more in the total amount of the polymerizable compound. The content of the polyfunctional polymerizable compound contained in the polymerizable compound is preferably 95% by mass or less, more preferably 92% by mass or less, and even more preferably 90% by mass or less in the total amount of the polymerizable compound. The content of the polyfunctional polymerizable compound contained in the polymerizable compound is preferably 5% by mass or more and 95% by mass or less, more preferably 8% by mass or more and 92% by mass or less, and even more preferably 10% by mass or more and 90% by mass or less in the total amount of the polymerizable compound. This makes it possible to make the curability of the glittering layer (cured film) formed by the ink composition more preferable.

[0068] Among the above-mentioned polymerizable compounds, it is preferable to contain a polymerizable compound having a cyclic structure, and it is more preferable to contain an aromatic polymerizable compound, which can make the gloss of the printed matter obtained by using the ink composition more preferable.

[0069] These polymerizable compounds may be solid or liquid at room temperature. Among these, the polymerizable compound is preferably liquid at room temperature. When the polymerizable compound is liquid at room temperature, it can be used as a solvent (dispersion medium) that dissolves or disperses each component contained in the ink composition.

[0070] When the polymerizable compound is liquid at room temperature, it is preferable to contain a hydrophobic polymerizable compound having a surface tension of 35 mN / m or more, and the hydrophobic polymerizable compound having a surface tension of 35 mN / m or more is more preferably a hydrophobic (meth)acrylate polymerizable compound having a surface tension of 35 mN / m or more. By containing such a polymerizable compound having a surface tension of 35 mN / m or more, an ink composition having good ejection properties even when ejected by an inkjet method can be obtained. Furthermore, the gloss of the printed matter can be improved.

[0071] Examples of hydrophobic polymerizable compounds having a surface tension of 35 mN / m or more include, for example, phenoxyethyl acrylate, phenoxyethyl methacrylate, benzyl acrylate, benzyl methacrylate, phenyl acrylate, phenyl methacrylate, EO-modified phenoxy acrylate, EO-modified phenoxy methacrylate, PO-modified phenoxy acrylate, PO-modified phenoxy methacrylate, bisphenol A diacrylate, bisphenol A dimethacrylate, EO-modified bisphenol A dimethacrylate, EO-modified bisphenol A diacrylate, PO-modified bisphenol A diacrylate, and PO-modified bisphenol A dimethacrylate.

[0072] The content of the polymerizable compound is not particularly limited, but is preferably 40% by mass or more in the total amount of the ink composition, more preferably 50% by mass or more, and even more preferably 60% by mass or more. When the content of the polymerizable compound is 40% by mass or more in the total amount of the ink composition, the curability of the cured film of the glittering layer formed when irradiated with active energy rays can be improved. The content of the polymerizable compound is preferably 90% by mass or less in the total amount of the ink composition, more preferably 87% by mass or less, and even more preferably 85% by mass or less. When the content of the polymerizable compound is 90% by mass or less in the total amount of the ink composition, the content of the glittering pigment and the like can be relatively increased, so that the ink composition and the resulting printed matter can be given the desired characteristics. The content of the polymerizable compound is preferably 40% by mass or more and 90% by mass or less in the total amount of the ink composition, more preferably 50% by mass or more and 87% by mass or less, and even more preferably 60% by mass or more and 85% by mass or less.

[0073] [Polymerization initiator] The active energy ray curable ink composition according to this embodiment may contain a polymerization initiator as necessary. The polymerization initiator promotes the polymerization reaction of the polymerizable compound in the ink composition by irradiation with active energy rays. Note that the polymerization initiator is not necessarily essential in the ink composition according to this embodiment. For example, when an electron beam is used as the active energy ray, a polymerization initiator may not be used.

[0074] Specific examples of the polymerization initiator include thioxanthones, aromatic ketones, alkylphenones, α-aminoalkylphenones, α-hydroxyketones, acylphosphine oxides, aromatic onium salts, organic peroxides, thio compounds, hexaarylbiimidazole compounds, ketoxime ester compounds, borate compounds, azinium compounds, metallocene compounds, active ester compounds, compounds having a carbon-halogen bond, and alkylamine compounds.

[0075] Specifically, bisacylphosphine oxides such as bis-(2,6-dichlorobenzoyl)phenylphosphine oxide, bis-(2,6-dichlorobenzoyl)-2,5-dimethylphenylphosphine oxide, bis-(2,6-dichlorobenzoyl)-4-propylphenylphosphine oxide, bis-(2,6-dichlorobenzoyl)-1-naphthylphosphine oxide, bis-(2,6-dimethoxybenzoyl)phenylphosphine oxide, bis-(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentylphosphine oxide, bis-(2,6-dimethoxybenzoyl)-2,5-dimethylphenylphosphine oxide, and bis-(2,4,6-trimethylbenzoyl)-phenylphosphine oxide; 2,6-dimethoxybenzoyldiphenylphosphine oxide, 2,6-dichlorobenzoyldiphenylphosphine oxide, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, and the like. Examples of the polymerization initiator include acylphosphine oxide-based polymerization initiators such as methylbenzoylphenylphosphinic acid methyl ester, 2-methylbenzoyldiphenylphosphine oxide, pivaloylphenylphosphinic acid isopropyl ester, and 2,4,6-trimethylbenzoyldiphenylphosphine oxide; aminoacetophenone-based polymerization initiators such as 2-methyl-1-[4-(methylthio)phenyl]-2-morphopropanone-1-one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butan-1-one, and 2-(dimethylamino)-2-[(4-methylphenyl)methyl]-1-[4-(4-morpholinyl)phenyl]-1-butanone; and thioxanthone-based polymerization initiators such as 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, and 2-isopropylthioxanthone.

[0076] Among these, the polymerization initiator preferably contains a sulfur-containing polymerization initiator such as a thioxanthone-based polymerization initiator. By containing a sulfur-containing polymerization initiator, the curability of the glittering layer (cured film) formed by the ink composition can be made more favorable.

[0077] The content of the sulfur-containing polymerization initiator is preferably 1.0% by mass or more in the total amount of the ink composition, more preferably 1.5% by mass or more, and even more preferably 2.0% by mass or more. The content of the sulfur-containing polymerization initiator is preferably 15.0% by mass or less in the total amount of the ink composition, more preferably 12.0% by mass or less, and even more preferably 10.0% by mass or less. The content of the sulfur-containing polymerization initiator is preferably 1.0% by mass or more and 15.0% by mass or less in the total amount of the ink composition, more preferably 1.5% by mass or more and 12.0% by mass or less, and even more preferably 2.0% by mass or more and 10.0% by mass or less. By containing the sulfur-containing polymerization initiator in such a range, the curability of the glittering layer (cured film) formed by the ink composition can be further improved.

[0078] In addition, it is preferable to further contain at least one of an acylphosphine oxide-based polymerization initiator, an aminoacetophenone-based polymerization initiator, or an alkylphenone-based polymerization initiator together with such a sulfur-containing polymerization initiator. The sulfur-containing polymerization initiator (for example, a thioxanthone-based polymerization initiator), the acylphosphine oxide-based polymerization initiator, the aminoacetophenone-based polymerization initiator, and the alkylphenone-based polymerization initiator are polymerization initiators having different absorption wavelength regions. Furthermore, the ink composition according to the present embodiment contains a glittering pigment, and the glittering pigment is likely to reflect a part of the active energy rays irradiated thereto, resulting in a problem of deterioration of the curing property. Therefore, by containing at least one of an acylphosphine oxide-based polymerization initiator, an aminoacetophenone-based polymerization initiator, or an alkylphenone-based polymerization initiator together with the sulfur-containing polymerization initiator, it is possible to make the curing speed of the ink composition appropriate, and therefore it is possible to improve the curing property. Furthermore, it is possible to suppress the orientation inhibition of the glittering pigment due to uneven curing or curing shrinkage, and to maintain the metallic glossiness imparted to the substrate.

[0079] [Polymerization inhibitor] The ink composition according to the present embodiment may contain a polymerization inhibitor as necessary. The polymerization inhibitor is not particularly limited, and examples of the polymerization inhibitor that can be used include diphenylpicrylhydrazide, tri-p-nitrophenylmethyl, p-benzoquinone, p-tert-butylcatechol, picric acid, copper chloride, methylhydroquinone, methoquinone, tert-butylhydroquinone, phenothiazines, and nitrosamines.

[0080] [Surfactants] The ink composition according to this embodiment may contain a surfactant as necessary. The surfactant is not particularly limited, but specific examples thereof include dimethylpolysiloxane-containing surfactants manufactured by BYK-Chemie, such as "BYK-306", "BYK-307", "BYK-333", "BYK-354", "BYK-361N", "BYK-371", "BYK-377", "BYK-378", "BYK-3455", "BYK-UV3500", "BYK-UV3505", "BYK-UV3510", "BYK-UV3535", and "BYK-UV3570"; and Evonik Degussa Japan, Inc., manufactured by Evonik Degussa Japan, Inc., manufactured by Evonik Degussa Japan, Inc., manufactured by Evonik Degussa Japan, Inc. Examples of such polymers include "Polyflow KL-401", "Polyflow KL-402", "Polyflow KL-403", and "Polyflow KL-404" manufactured by Kyoeisha Chemical Co., Ltd.; acrylic polymers include "Polyflow No. 75", "Polyflow No. 77", "Polyflow No. 90", "Polyflow No. 95", and "Polyflow No. 99C" manufactured by Kyoeisha Chemical Co., Ltd.; and "TEGO Wet500" manufactured by Evonik Degussa Japan Ltd.

[0081] The content of the surface conditioner is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, and even more preferably 0.3% by mass or more, based on the total amount of the ink composition. The content of the surface conditioner is preferably 5.0% by mass or less, more preferably 4.5% by mass or less, and even more preferably 4.0% by mass or less, based on the total amount of the ink composition. By setting the content to 0.1% by mass or more or 5.0% by mass or less, the ink composition has favorable wettability with respect to a thermoplastic resin substrate, etc., and when recording (forming an image) on the substrate, the active energy ray curable ink composition can be wetted and spread without causing repelling, making it possible to make a particularly preferable ink composition. The content of the surface conditioner is preferably 0.1% by mass or more and 5.0% by mass or less, more preferably 0.2% by mass or more and 4.5% by mass or less, and even more preferably 0.3% by mass or more and 4.0% by mass or less, based on the total amount of the ink composition.

[0082] [Other additives] The ink composition according to the present embodiment may contain various other additives such as an organic solvent, a plasticizer, a light stabilizer, a wax, an ultraviolet absorber, an antioxidant, an alignment agent, an antibacterial agent, an antiviral agent, etc. The ink composition may also contain a resin.

[0083] The ink composition according to the present embodiment may contain a coloring material (dye or pigment) that is different from the glittering pigment and is used in a typical inkjet ink composition. The coloring material is preferably 3.0% by mass or less of the total amount of the ink composition, more preferably 1.0% by mass or less, even more preferably 0.5% by mass or less, and even more preferably 0.2% by mass or less.

[0084] Furthermore, the water content in the ink composition according to this embodiment is preferably 5.0% by mass or less, more preferably 3.0% by mass or less, and even more preferably 1.0% by mass or less, based on the total amount of the ink composition.

[0085] In addition, the ink composition according to the present embodiment may contain a volatile organic solvent, but if the polymerizable compound contained therein is liquid at room temperature, the polymerizable compound becomes a solvent (dispersion medium) that dissolves or disperses each of the contained components, so the ink composition may not contain a volatile organic solvent. Among these, if the polymerizable compound contained therein is liquid at room temperature, the content of the volatile organic solvent is preferably 20.0 mass% or less of the total amount of the ink composition, more preferably 10.0 mass% or less, even more preferably 5.0 mass% or less, and even more preferably 1.0 mass% or less. When the polymerizable compound contains a liquid compound at room temperature and the content of the volatile organic solvent is 20.0 mass% or less of the total amount of the ink composition, it is possible to suppress the precipitation of the contained components due to the volatilization of the ink composition in the inkjet nozzle, and therefore it is possible to further improve the ejection properties of the inkjet.

[0086] Furthermore, the ink composition according to the present embodiment may contain a resin (binder resin) different from the above-mentioned polymerizable compound, the above-mentioned pigment dispersant, etc. The content of the resin (binder resin) in the total amount of the ink composition is preferably 20.0 mass % or less, more preferably 10.0 mass % or less, even more preferably 5.0 mass % or less, and even more preferably 1.0 mass % or less.

[0087] (Viscosity and surface tension of ink composition) From the viewpoints of inkjet ejection properties and ejection stability, the viscosity of the ink composition according to this embodiment at the ejection temperature (e.g., 40°C) is preferably 30 mPa·s or less, more preferably 25 mPa·s or less, and even more preferably 22 mPa·s or less. Furthermore, the viscosity of the ink composition according to this embodiment at the ejection temperature (e.g., 40°C) is preferably 3 mPa·s or more, more preferably 5 mPa·s or more, and even more preferably 8 mPa·s or more, but it is preferable to adjust it appropriately according to the inkjet head to be used.

[0088] Moreover, from the viewpoints of inkjet ejection properties, ejection stability, and leveling properties on a substrate, the surface tension of the ink composition according to this embodiment is preferably 20 mN / m or more, more preferably 23 mN / m or more, and even more preferably 25 mN / m or more at 25° C. Moreover, the surface tension of the ink composition according to this embodiment is preferably 40 mN / m or less, more preferably 37 mN / m or less, and even more preferably 35 mN / m or less.

[0089] (Method of producing ink composition) The method for producing the ink composition is not particularly limited, and a conventionally known method can be used. The ink composition is prepared by dispersing a polymerizable compound, a glittering pigment, a polymerization initiator, a dispersant, etc., using a dispersing machine, and then adding a polymerization inhibitor, a leveling agent, etc., as necessary, and stirring uniformly to obtain a mixture, and then adding the glittering pigment and further filtering through a filter to obtain an ink composition.

[0090] Next, a printed matter obtained using the ink composition according to this embodiment will be described.

[0091] ≪2.Printed materials≫ A printed matter obtained by using the ink composition according to the above embodiment includes a substrate (recording medium) and a glittering layer formed on the surface of the substrate (recording medium). The glittering layer contains a cured product of the polymerizable compound contained in the ink composition according to the above embodiment and a glittering pigment.

[0092] Here, the particle size of the glitter pigment contained in the ink composition according to the above embodiment is controlled within a predetermined range, so that the inkjet ejection stability is high and it is possible to obtain a printed matter imparted with a desired metallic tone.

[0093] [Substrate (recording medium)] The substrate (recording medium) included in the recorded matter of this embodiment is not particularly limited, and may be a non-absorbent substrate such as a resin substrate, a metal plate, or glass, an absorbent substrate such as paper or cloth, or a substrate with a surface coating such as a substrate having a receiving layer, and various substrates can be used.

[0094] Examples of non-absorbent substrates include resin substrates such as polyester resins (polyethylene terephthalate, polyethylene naphthalate), polypropylene synthetic paper, polyolefin resins (polypropylene resins, polyethylene resins, etc.), acrylic resins, polystyrene resins, polycarbonate resins, ABS resins, vinyl chloride resins, polyimide resins, metals, metal foil coated paper, glass, synthetic rubber, natural rubber, etc. Among these, resin substrates containing at least one selected from the group consisting of polypropylene resins, polycarbonate resins, polystyrene resins, polyethylene resins, ABS resins, vinyl chloride resins, polyethylene terephthalate, and acrylic resins are preferred.

[0095] Examples of absorbent substrates include woody paper, medium-quality paper, fine paper, synthetic paper, cotton, chemical fiber fabrics, silk, hemp, cloth, nonwoven fabrics, and leather.

[0096] Examples of substrates having a coated surface include coated paper, art paper, cast paper, lightly coated paper, and lightly coated paper.

[0097] [Primer] The substrate may be coated with a primer. The primer is applied to the surface of the substrate (recording medium) and has the function of improving the fixation of a color ink composition containing a coloring material (dye or pigment) or a glitter ink composition containing a glitter pigment, and of suppressing bleeding to improve image quality.

[0098] The primer may be an active energy ray curable ink composition, a solvent-based ink composition containing a solvent, or an aqueous ink composition containing water. The primer agent may be, for example, a colored ink composition described below, which is an ink composition mainly composed of a resin component or a polymerizable compound and is adjusted so that the color is not visible by removing or reducing the amount of a coloring material. The primer agent may also be, for example, a conventionally known primer agent.

[0099] The primer may be applied to the surface of the substrate (recording medium) by any method, such as spray application, application using a towel, sponge, nonwoven fabric, tissue, or the like, a dispenser, brush application, gravure printing, flexographic printing, silk screen printing, inkjet printing, or thermal transfer printing.

[0100] [Glitter layer] The photoluminescent layer is a layer formed by an ink composition containing a polymerizable compound according to the above embodiment, a photoluminescent pigment, and a polymerization initiator. Specifically, the photoluminescent layer is a layer containing a cured product of the polymerizable compound and a photoluminescent pigment, which is formed by ejecting an ink composition containing a polymerizable compound, a photoluminescent pigment, and a polymerization initiator onto a surface of a substrate by an inkjet method and irradiating the ink composition with active energy rays.

[0101] The metal-containing glittering pigment contained in the ink composition according to the above embodiment has a particle size controlled within a predetermined range, and therefore has high inkjet ejection stability, and can form a glittering layer imparted with a desired metallic tone.

[0102] [Colored ink composition] When printing the glittering ink composition, a coloring ink composition may be used together. The coloring ink composition is an ink composition containing a coloring material (dye or pigment) that is used in a normal coloring ink composition different from the glittering pigment. The coloring ink composition may be applied before or after the ink composition containing the glittering pigment is ejected by inkjet. The coloring ink composition may be an active energy ray curable ink composition, a non-aqueous ink composition containing a coloring material and not containing water, or an aqueous ink composition containing a coloring material and containing water. In addition, it may be a plurality of ink compositions (for example, a plurality of ink compositions including yellow ink, magenta ink, cyan ink, black ink, light magenta ink, light cyan ink, light black ink, white ink, orange ink, green ink, blue ink, and red ink). The coloring ink composition may contain a resin.

[0103] The method for applying the color ink composition is not particularly limited. For example, the method may be a spray method, a coater method, an inkjet method, a gravure method, or a flexography method. Among these, the inkjet method is preferable for discharging (applying). The inkjet method makes it easy to discharge (apply) the ink to any desired location on the substrate, or to the entire substrate surface.

[0104] The coloring material of the colored ink composition is not particularly limited, and may be a dye-based or pigment-based coloring material. However, it is preferable to use a pigment-based ink composition that has good resistance to water and light. The pigment that can be used in the colored ink composition is not particularly limited. Examples of the pigment include organic pigments and inorganic pigments that are used in conventional ink compositions. These may be used alone or in combination of two or more. Specific examples of organic pigments include insoluble azo pigments, soluble azo pigments, derivatives from dyes, phthalocyanine organic pigments, quinacridone organic pigments, perylene organic pigments, perinone organic pigments, dioxazine organic pigments, nickel azo pigments, isoindolinone organic pigments, pyranthrone organic pigments, thioindigo organic pigments, condensed azo organic pigments, benzimidazolone organic pigments, quinophthalone organic pigments, isoindoline organic pigments, quinacridone solid solution pigments, organic solid solution pigments such as perylene solid solution pigments, inorganic pigments include titanium oxide, zinc oxide, and other pigments include carbon black. The pigment that can be used in the ink composition may be a combination of a plurality of organic pigments or inorganic pigments, or may be a combination of a pigment dispersion dispersed in a water-soluble solvent by a pigment dispersant and a self-dispersed pigment.

[0105] [Overcoat agent] An overcoat agent may be applied to the surface of the printed matter. The overcoat agent is formed on the uppermost surface of the printed matter (for example, the surface of the colored ink composition) and has the function of improving the durability of the printed matter.

[0106] The overcoat agent may be an active energy ray curable ink composition, a non-aqueous ink composition not containing water, or an aqueous ink composition containing water. The overcoat agent may be, for example, a colored ink composition containing the above-mentioned coloring material (dye / pigment), and may be an ink composition that is mainly composed of a resin component or a polymerizable compound and is adjusted so that the color is not visible by removing or reducing the amount of the coloring material. By using an overcoat agent having the same composition as the colored ink composition or the glittering ink composition, it is possible to improve the adhesion with the colored ink composition or the glittering ink composition. In addition, the overcoat agent may be, for example, a conventionally known overcoat agent.

[0107] The overcoat agent may be applied to the surface of a printed material by any method, such as spray application, application using a towel, sponge, nonwoven fabric, tissue, or the like, application with a dispenser or brush, gravure printing, flexographic printing, silk screen printing, inkjet printing, or thermal transfer printing.

[0108] 3. Recording method The recording method according to the present embodiment is a recording method in which the ink composition according to the above embodiment is ejected by an inkjet method. The ink composition according to the above embodiment contains a glittering pigment having a particle size within a predetermined range, and the recording method according to the present embodiment has high inkjet ejection properties and can produce printed matter having good gloss.

[0109] In order to obtain a surface-treated substrate (recording medium), a pretreatment step may be included in which the surface of the substrate is previously subjected to a surface treatment to obtain a surface-treated substrate.

[0110] Examples of the surface treatment method include corona treatment, flame treatment, plasma treatment, flame treatment, ultraviolet irradiation treatment, chromic acid treatment, silane coupling treatment, etc. Two or more surface treatments may be combined.

[0111] The ink composition containing the glittering pigment having a particle size within a predetermined range may be ejected by any of the following ink jet methods: piezo method, thermal method, electrostatic method, and the like.

[0112] The method may further include an irradiation step of irradiating the ink composition applied to the surface of the substrate with active energy rays. This irradiation forms a cured product of the ink composition on the surface of the substrate. Examples of active energy rays include electromagnetic waves such as far ultraviolet rays, ultraviolet rays, near ultraviolet rays, visible light rays, infrared rays, X-rays, and gamma rays, as well as active energy rays such as electron beams, proton beams, and neutron beams.

[0113] ≪4. Manufacturing method of printed matter≫ The above-mentioned recording method can also be defined as a method for producing a printed matter, in which an ink composition containing a glittering pigment having a particle size within a predetermined range is ejected onto a substrate by an inkjet method.

[0114] 5. Inkjet recording device The ink jet recording apparatus according to the present embodiment is an ink jet recording apparatus equipped with a storage mechanism filled with an ink composition containing a glittering pigment having a particle diameter within a predetermined range.

[0115] The inkjet recording apparatus according to the present embodiment may be an off-carriage type inkjet recording apparatus in which the ink cartridge is fixed externally, or may be a line printer type inkjet recording apparatus in which the inkjet head does not move and ejects the ink composition onto a recording medium (substrate).

[0116] The storage mechanism mounted on the inkjet recording apparatus according to the present embodiment is not particularly limited, and examples thereof include containers such as ink bottles, pouches, bag-in-boxes, and drums. These containers may also be housed in cartridges or the like. The material of the storage container is not particularly limited, and may be a conventionally known resin, or may be a material that contains a metal material in part (for example, an aluminum pouch with an aluminum vapor deposition layer).

[0117] The ejection method in each ejection section may be any of a piezoelectric method, a thermal method, an electrostatic method, and the like.

[0118] The inkjet recording apparatus according to the present embodiment may include a light source that irradiates active energy rays. The light source that irradiates active energy rays is not particularly limited, and examples thereof include a high-pressure mercury lamp, a metal halide lamp, a low-pressure mercury lamp, an ultra-high-pressure mercury lamp, an ultraviolet laser, sunlight, and an LED lamp. It is more preferable to use an LED lamp as the light source in view of energy saving and high flexibility in designing the printing apparatus. EXAMPLES

[0119] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these descriptions in any way.

[0120] 1. Preparation of photoluminescent pigment (preparation of photoluminescent pigment dispersion) (1) Luster pigment A Coating solution 1 having the following composition was uniformly applied onto a PET film having a thickness of 100 μm by a bar coating method, and dried at 60° C. for 10 minutes to form a release resin layer.

[0121] Coating fluid 1 Cellulose acetate butyrate (butyl content 35-39%, Kanto Chemical Co., Ltd.) 3% Isopropanol 97%

[0122] Next, a laminate was produced by forming a metallic aluminum thin film with a thickness of 20 nm on the peelable resin layer using a "VE-1010 vacuum deposition apparatus" manufactured by Vacuum Device Co., Ltd. The resulting laminate was immersed in isopropanol, and 10 parts by mass of oleyl oleate (fatty acid ester) was added to 100 parts by mass of metallic aluminum. Peeling, crushing, and fine dispersion treatment were simultaneously carried out for 12 hours using a "VS-150 ultrasonic disperser" manufactured by AS ONE Co., Ltd., to obtain a glittering pigment dispersion containing a glittering pigment (metal-containing glittering pigment made of aluminum) surface-treated with a fatty acid ester.

[0123] The obtained bright pigment dispersion liquid was filtered with a SUS mesh filter to remove coarse particles.Then, isopropanol was distilled off from the filtrate with an evaporator.Then, isopropanol was replaced with phenoxyethyl acrylate (polymerizable compound), the concentration of the bright pigment was adjusted, and a bright pigment dispersion liquid A was prepared that contains 5% by mass of bright pigment A that is surface-treated with a fatty acid ester and has the film thickness and D10, D50, and D90 shown in the table below.

[0124] (2) Bright pigment B In the production of brilliant pigment A, the thickness of the metallic aluminum thin film, the intensity and treatment time of the ultrasound, and the filter aperture were changed to prepare brilliant pigment dispersion B which was surface-treated with a fatty acid ester and contained 5% by mass of brilliant pigment B with the thicknesses and D10, D50, and D90 shown in the table below.

[0125] (3) Bright pigment C In the production of brilliant pigment A, the fatty acid ester (oleyl oleate) was changed to a phosphate ester (aromatic phosphate ester (CR-741 manufactured by Daihachi Chemical Industry Co., Ltd.)), and the thickness of the metallic aluminum thin film, the intensity and treatment time of the ultrasound, and the aperture of the filter were further changed to prepare brilliant pigment dispersion C that was surface-treated with phosphate ester and contained 5 mass% of brilliant pigment C with the film thicknesses and D10, D50, and D90 shown in the table below.

[0126] (4) Luminescent pigment D In the production of brilliant pigment C, the thickness of the metallic aluminum thin film, the intensity and treatment time of the ultrasound, and the aperture of the filter were changed to prepare brilliant pigment dispersion D containing 5 mass% of brilliant pigment D that had been surface-treated with phosphate ester and had the film thickness, D10, D50, and D90 changed as shown in the table below.

[0127] (5) Luminescent Pigment E In producing the brilliant pigment A, the thickness of the metallic aluminum thin film, the intensity and treatment time of the ultrasonic waves, and the aperture of the filter were changed to prepare a brilliant pigment dispersion containing a specified amount of brilliant pigment. 5 g of a polyester resin having an acid value of 70 (Crylcoat340, supplied by UCB of Belgium) and 5 g of an epoxy resin having an epoxy equivalent of 750 (Araldit GT6063ES, supplied by Vantico of Switzerland) dissolved in 100 g of acetone were added to 200 g of this brilliant pigment dispersion and stirred for 1 hour, after which the above-mentioned centrifugation and washing operations were performed, and the acetone was replaced with phenoxyethyl acrylate. The surface was protected with the polyester resin, and a brilliant pigment dispersion E containing 5 mass% of brilliant pigment E with the thicknesses and D10, D50, and D90 shown in the table below was prepared.

[0128] (6) Bright pigment F In the production of brilliant pigment E, the thickness of the metallic aluminum thin film, the intensity and treatment time of the ultrasonic waves, and the aperture of the filter were changed to prepare brilliant pigment dispersion F containing 5% by mass of brilliant pigment F, which was surface-protected with polyester resin and had the film thickness, D10, D50, and D90 changed as shown in the table below.

[0129] (7) Glitter pigment G In producing the brilliant pigment F, 10 parts by mass of the silicone surfactant UV3500 was further added to the polyester resin, and the thickness of the metallic aluminum thin film, the intensity and processing time of the ultrasonic waves, and the aperture of the filter were changed to prepare brilliant pigment dispersion G containing 5% by mass of brilliant pigment G that had been surface-protected with the polyester resin and the silicone surfactant and had the film thickness, D10, D50, and D90 changed as shown in the table below.

[0130] (7) Bright pigment H In the production of brilliant pigment A, 10 parts by mass of the silicone surfactant UV3500 was added instead of oleyl oleate, and the thickness of the metallic aluminum thin film, the intensity and processing time of the ultrasonic waves, and the aperture of the filter were further changed to prepare brilliant pigment dispersion H containing 5% by mass of brilliant pigment H that had been surface-protected with a silicone surfactant and had the film thickness, D10, D50, and D90 changed as shown in the table below.

[0131] (8) Bright pigment I In the production of brilliant pigment G, tetraethoxysilane was added instead of polyester resin, the thickness of the metallic aluminum thin film, the intensity and processing time of the ultrasonic waves, and the aperture of the filter were changed, and the surface was protected with a silicone surfactant to prepare brilliant pigment dispersion I containing 5 mass% of brilliant pigment I, with the film thickness, D10, D50, and D90 changed as shown in the table below.

[0132] (9) Bright pigment J In the production of brilliant pigment A, oleyl oleate was not added, and the thickness of the metallic aluminum thin film, the intensity and processing time of the ultrasonic waves, and the aperture of the filter were changed to prepare brilliant pigment dispersion J containing 5 mass% of brilliant pigment J that was not surface-protected and had the film thickness, D10, D50, and D90 changed as shown in the table below.

[0133] (10) Bright pigment K In the production of brilliant pigment I, the thickness of the metallic aluminum thin film, the intensity and treatment time of the ultrasound, and the aperture of the filter were changed to prepare brilliant pigment dispersion K containing 5 mass% of brilliant pigment K that was not surface-protected and had the film thickness, D10, D50, and D90 changed as shown in the table below.

[0134] (11) Bright pigment L In the production of brilliant pigment A, the thickness of the metallic aluminum thin film, the intensity and treatment time of the ultrasonic waves, and the aperture of the filter were changed to prepare brilliant pigment dispersion L containing 5 mass% of brilliant pigment L having the thicknesses and D10, D50, and D90 shown in the table below, which was surface-treated with a fatty acid ester.

[0135] (12) Bright pigment M In the production of brilliant pigment C, the thickness of the metallic aluminum thin film, the intensity and treatment time of the ultrasound, and the aperture of the filter were changed to prepare brilliant pigment dispersions M containing 5 mass% of brilliant pigment M having the thicknesses and D10, D50, and D90 shown in the table below, which were surface-treated with phosphate ester.

[0136] (13) Luminous pigment N In the production of brilliant pigment G, the thickness of the metallic aluminum thin film, the intensity and processing time of the ultrasonic waves, and the aperture of the filter were changed, and the surface was protected with a silicone surfactant to prepare brilliant pigment dispersion N containing 5 mass% of brilliant pigment N, the thickness of which, and D10, D50, and D90 were changed as shown in the table below.

[0137] (14) Bright pigment O In the production of brilliant pigment G, the thickness of the metallic aluminum thin film, the intensity and processing time of the ultrasonic waves, and the aperture of the filter were changed, and the surface was protected with a silicone surfactant to prepare brilliant pigment dispersion O containing 5 mass% of brilliant pigment O, the thickness of which, D10, D50, and D90 were changed as shown in the table below.

[0138] [Table 1]

[0139] 2. Preparation of Ink Composition An ink composition was prepared using the above-mentioned "glossy pigment dispersion liquid." Specifically, the above-mentioned glittering pigment dispersion liquid, a polymerizable compound, a polymerization initiator, and a polymerization inhibitor were used to prepare ink compositions of the examples and comparative examples in the proportions shown in the table below. The units are % by mass.

[0140] 3. Evaluation (liquid permeability) The ink compositions of the Examples and Comparative Examples were evaluated for filter permeability. Specifically, the ink compositions of the Examples and Comparative Examples were passed through a stainless steel 2000 mesh filter having a diameter of 25 mm, and the amount of the ink passing through was measured and evaluated (represented as "permeability" in the table). Evaluation criteria A: The amount of fluid passed was 20 ml or more. B: The amount of liquid passed was 5 ml or more and less than 20 ml. C: The amount of liquid passed was less than 5 ml. A and B are within the usable range.

[0141] (Dischargeability) The ink jet ejection properties of the ink compositions of the Examples and Comparative Examples were evaluated using a droplet observation device JetXpert manufactured by ImageXpert, Inc. Specifically, the ink compositions of the Examples and Comparative Examples were ejected from an inkjet head for 10 minutes, and the occurrence of non-ejection, bending, and scattering was evaluated (represented as "ejection properties" in the table). Evaluation criteria A: The rate of defective discharge is less than 3% B: The rate of ejection defects is between 3% and 10%. C: The rate of ejection failure is 10% or more. A and B are within the usable range.

[0142] (curable) The curability of the glittering layer in the printed matter obtained using the ink compositions of the examples and comparative examples was evaluated. Specifically, the ink compositions of the examples and comparative examples were ejected onto the surface of a recording medium (PET film (Cosmoshine A4360, Toyobo Co., Ltd.)) using an inkjet recording device ("Material Printer DMP-2850" manufactured by Fujifilm Corporation), and a printed matter was produced by irradiating active energy rays with a peak illuminance of 250 mW / cm2 and an accumulated light quantity of 650 mW / cm2 using an LED lamp with a wavelength of 385 nm. The curability of the glittering layer of the obtained printed matter was confirmed by touching it with a finger (referred to as "curability" in the table). Evaluation criteria A: There was no stickiness and the curing properties were good. B: There was some tack immediately after printing. C: Tacky and poor curing. A and B are within the practical usable range.

[0143] (Glossy) The gloss of the prints obtained using the non-aqueous ink compositions of the Examples and Comparative Examples was evaluated. Specifically, for the prints obtained above, a multi-angle colorimeter CM-M6 manufactured by Konica Minolta was used to make the incident light incident on the glittering layer at an incident angle of 45° from the printed surface as shown in FIG. 1, and the angle shifted by 15° from the reflection angle to the normal line direction relative to the incident angle was used as the measurement angle, and the L value at the measurement angle was measured. * a * b * L in color space * (brightness index) was measured, and the gloss was evaluated according to the following evaluation criteria (referred to as "gloss" in the table). A:L * The value was 130 or higher. B:L * The value was greater than or equal to 110 and less than 130. C:L * The value was less than 110. A and B are within the practical usable range.

[0144] (hiding) The hiding ratio of the printed matter obtained using the ink compositions of the Examples and Comparative Examples was evaluated. Specifically, the ink compositions of the Examples and Comparative Examples were ejected onto the surface of a hiding ratio test paper using an inkjet recording device, and cured by irradiating with active energy rays, and the tristimulus value Y of the white part and the black part was measured to determine the hiding ratio, and the hiding ratio was evaluated according to the following evaluation criteria (represented as "hiding" in the table). Evaluation criteria A: Concealment rate is 95% or more. B: Concealment rate is 80% or more but less than 95% C: Concealment rate is less than 80% A and B are within the practical usable range. [Table 2]

[0145] In the table, "PHEA" stands for phenoxyethyl acrylate.

[0146] In the table, "BZA" stands for benzyl acrylate.

[0147] In the table, "PHA" stands for phenyl acrylate.

[0148] In the table, "PHEMA" stands for phenoxyethyl methacrylate.

[0149] In the table, "BZMA" stands for benzyl methacrylate.

[0150] In the table, "BPADA" stands for EO-modified bisphenol A diacrylate.

[0151] In the table, "16HDA" stands for 1,6-hexanediol diacrylate.

[0152] In the table, "NPDA" stands for neopentyl glycol diacrylate.

[0153] In the table, "DPA" stands for dipropylene glycol diacrylate.

[0154] In the table, "IBXA" stands for isobornyl acrylate.

[0155] In the table, "VEEA" stands for 2-(2-vinyloxyethoxy)ethyl acrylate.

[0156] In the table, "ACMO" stands for acryloylmorpholine.

[0157] In the table, "TPO" stands for 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide (corresponding to "acylphosphine oxide photopolymerization initiator").

[0158] In the table, "819" is phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (corresponding to "acylphosphine oxide photopolymerization initiator").

[0159] In the table, "379" is 2-(dimethylamino)-2-[(4-methylphenyl)methyl]-1-[4-(4-morpholinyl)phenyl]-1-butanone (corresponding to "alkylphenone-based polymerization initiation").

[0160] In the table, "DETX" stands for 2,4-diethylthioxanthen-9-one (corresponding to "thioxanthone-based polymerization initiator" and "sulfur-containing polymerization initiator").

[0161] In the table, "ITX" stands for 2-isopropylthioxanthone (corresponding to "thioxanthone-based polymerization initiator" and "sulfur-containing polymerization initiator").

[0162] In the table, "BMS" stands for 4-(4-methylfensilthio)benzophenone (corresponding to "sulfur-containing polymerization initiator").

[0163] In the table, "EHA" stands for 2-ethylhexyl-4-(dimethylamino)benzonate.

[0164] In the table, "MBP" stands for 4-methylbenzophenone.

[0165] In the table, "AD" stands for phenothiazine (polymerization inhibitor).

[0166] As can be seen from the above table, an active energy ray-curable ink composition in which the particle size of the effective pigment is within a predetermined range has excellent inkjet ejection properties and can produce printed matter with good gloss.

Claims

1. An active energy ray-curable ink composition that is discharged by an inkjet method, comprising: The ink composition contains a polymerizable compound and a glittering pigment, the relationship among the volume-based cumulative 10% particle size (D10) (μm), the volume-based cumulative 50% particle size (D50) (μm), and the volume-based cumulative 90% particle size (D90) (μm) of the bright pigment satisfies the relationship of the following formula (I): Ink composition. (D90-D10) / D50≦2...(I)

2. Further, a polymerization initiator is contained, The polymerization initiator contains a sulfur-containing polymerization initiator. The ink composition according to claim 1 .

3. The polymerizable compound is Contains a hydrophobic (meth)acrylate polymerizable compound having a surface tension of 35 mN / m or more The ink composition according to claim 1 or 2.

4. The polymerizable compound is A monofunctional polymerizable compound, A polyfunctional polymerizable compound having two or more functional groups, Contains The ink composition according to claim 1 .

5. The luster pigment contains a metal-containing luster pigment. The ink composition according to claim 1 .

6. The polymerizable compound contains an aromatic polymerizable compound. The ink composition according to claim 1 .

7. A printed matter comprising the ink composition according to any one of claims 1 to 6 printed on the surface of a substrate.

8. A storage mechanism filled with the ink composition according to any one of claims 1 to 6 is provided. Inkjet recording device.

9. The ink composition according to any one of claims 1 to 6 is ejected by an ink-jet method. Recording method.

10. A printed matter is produced by ejecting the ink composition according to any one of claims 1 to 6 by an inkjet method. A method for producing printed matter.

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