JP2007144683A - Ink-jet recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink-jet recording method, in which neither beading nor color bleeding develops in a medium having little or further no ink absorbency, with which an image having a high image quality is obtained and in which ununiform gloss and ununiform image density are improved. <P>SOLUTION: In the ink-jet recording method, which includes an ink-jet ink containing at least a coloring agent, water and a polymer compound having a hydrophilic main chain with a plurality of side chains, between which crosslinking bonding can be formed, under the condition that the crosslinking bonding is formed by being irradiated with active energy rays, after a recording material is impacted by the ink-jet ink, the ink-jet ink is set to be cured with the active energy rays emitted from a light source having its maximum luminous intensity within the range of 210-280 nm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ink jet recording method, and more particularly to an ink jet recording method for recording an image using an active energy ray-curable ink.

  The ink jet recording method is capable of recording high-definition images with a relatively simple apparatus, and has been rapidly developed in various fields. In addition, there are various uses, and a recording medium or ink suitable for each purpose is used.

  In particular, in recent years, the recording speed has been greatly improved, and printers having performance capable of withstanding light printing applications have been developed.

  However, in order to bring out the performance of the ink jet printer, an ink jet special paper provided with ink absorbability is required.

  When recording on coated paper or art paper that does not absorb much ink, or on plastic film that does not absorb ink at all, there are problems such as so-called bleed that cause different color ink liquids to mix on the recording medium and cause color turbidity. However, it has been a problem in providing a variety of recording media to inkjet.

  In the above problems, a hot-melt ink composition made of a wax that is solid at room temperature is used, liquefied by heating, etc., sprayed with some energy applied, cooled and solidified while adhering to the recording medium, and recorded A hot-melt ink jet recording method for forming dots has been proposed.

  Since this ink is solid at room temperature, it does not get dirty during handling, and there is no substantial amount of ink evaporation at the time of melting, so there is no clogging of the nozzles. Furthermore, an ink composition has been proposed that solidifies immediately after adhering and has less color bleeding and provides good print quality regardless of paper quality (see, for example, Patent Documents 1 and 2).

  However, an image recorded by such a method has problems such as deterioration in quality due to the rising of the dots and lack of scratching performance because the ink dots are in the form of soft wax.

  On the other hand, an inkjet recording ink that is cured by exposure to ultraviolet rays is disclosed (for example, see Patent Document 3). Further, a so-called non-aqueous ink containing a pigment as an essential component, trifunctional or higher polyacrylate as a polymerizable material, and a main solvent of ketone and alcohol has been proposed (for example, (See Patent Document 4).

  Further, an ink using a water-based ultraviolet polymerization monomer has been proposed (see, for example, Patent Document 5).

In these methods, since the ink itself is cured with a curing component, recording is possible even on a non-absorbing medium. However, since the curing component other than the colorant is contained in a large amount and does not volatilize, the recording surface is reduced. There was a problem that the ink dots swelled up, and the image quality, particularly glossiness, was likely to be unnatural.
US Pat. No. 4,391,369 U.S. Pat. No. 4,484,948 U.S. Pat. No. 4,228,438 Japanese Patent Publication No. 5-64667 JP-A-7-224241

  It is an object of the present invention to produce an image with high image quality, low glossiness and unevenness of image density, with less ink absorbability and without occurrence of beading or color bleeding on a medium having no ink absorbability. An improved ink jet recording method is provided.

  The above object of the present invention has been achieved by the following configurations 1 to 11.

1. After landing an ink-jet ink containing at least a colorant, water, and a polymer compound having a plurality of side chains in a hydrophilic main chain and capable of forming a cross-linked bond between the side chains on a recording material, In the inkjet recording method in which the cross-linking is formed by irradiating active energy rays,
An inkjet recording method, wherein the inkjet ink is cured by the active energy ray emitted from a light source having a maximum illuminance in a range of 210 nm to 280 nm.

  2. 2. The ink jet recording method according to 1 above, wherein the light source is a lamp in which a plurality of light emitting diodes are arranged.

  3. 3. The ink jet recording method according to 1 or 2, wherein the active energy ray is irradiated for 0.001 second to 1.0 second after the ink jet ink has landed on the recording material.

  4). 4. The ink jet recording method according to 2 or 3, wherein the light emitting diode uses a diamond thin film as a light emitting element.

  5. 5. The ink jet recording apparatus according to any one of the above items 1 to 4, wherein an ink jet recording apparatus having a carriage storing an ink jet recording head and provided with a lamp having a plurality of ultraviolet LEDs arranged at both ends of the carriage is used. Inkjet recording method.

  6). An inkjet recording apparatus having inkjet recording heads A and B that respectively eject at least two colors of inks A and B, and having a lamp in which a plurality of ultraviolet LEDs are arranged in the vicinity of the inkjet recording heads A and B is used. 6. The ink jet recording method according to any one of 1 to 5 above.

  7). Any one of the items 1 to 4, wherein the inkjet recording head is a line head system, and an inkjet recording apparatus provided with a lamp in which a plurality of ultraviolet LEDs are arranged on the downstream side of the inkjet recording head is used. The inkjet recording method as described.

  8). 8. The ink jet recording according to any one of 1 to 7, wherein the polymer compound is contained in an amount of 0.8% by mass to 5.0% by mass with respect to the total mass of the ink jet ink. Method.

  9. The hydrophilic main chain is a saponified product of polyvinyl acetate, and the saponified product has a saponification degree of 77 mol% to 99 mol% and an average polymerization degree of 200 as defined in JIS K 6726-1994, respectively. The inkjet recording method according to any one of 1 to 8, wherein the inkjet recording method is .about.4000.

  10. 10. The ink jet recording method according to any one of 1 to 9, wherein a modification rate of the side chain with respect to the hydrophilic main chain is 0.8 mol% to 4 mol%.

  11. 11. The ink jet recording method according to any one of 1 to 10, wherein the ink jet ink contains a water-soluble photopolymerization initiator.

  According to the present invention, there is no occurrence of beading or color bleeding with respect to a medium having a low ink absorbability or a non-ink absorbability, and an image with high image quality can be obtained, and gloss unevenness and image density unevenness are improved. The ink jet recording method can be provided.

  In the ink jet recording method of the present invention, by using the configuration defined in any one of claims 1 to 11, beading or the like can be performed on a medium having a low ink absorbability and further having no ink absorbability. It was possible to provide an ink jet recording method in which no color bleeding occurred, an image with high image quality was obtained, and gloss unevenness and image density unevenness were improved.

  Hereinafter, details of each component according to the present invention will be sequentially described.

  As a result of intensive studies on the above problems, the present inventor, as a first step, has a plurality of side chains in the hydrophilic main chain, and can be crosslinked between the side chains by irradiating active energy rays. The present inventors have found a clue to solve the above-mentioned problems by incorporating a high molecular compound into the ink.

  However, it has been found that there is a problem that image density unevenness and gloss unevenness are likely to occur depending on the type of image depending on the main wavelength of the active energy ray to be irradiated.

  In particular, an ink having a plurality of side chains in the hydrophilic main chain and containing a polymer compound that can be cross-linked between the side chains by irradiation with active energy rays causes a curing reaction depending on the main wavelength of the active energy rays. The degree of gelation and the gel state until ink drying change remarkably, and the mixed state of the polymer compound and the color material changes. As a result, the problem that image density unevenness and gloss unevenness are likely to occur is highlighted. It was.

<< Inkjet recording method (also referred to as image forming method) >>
The ink jet recording method (also referred to as image forming method) of the present invention will be described.

  Based on the knowledge obtained in the first step, the present inventor has further intensively studied the above problems, and as a result, at least a colorant (also referred to as a colorant) as described in claim 1. Ink-jet ink containing water and a polymer compound having a plurality of side chains in the hydrophilic main chain and capable of forming a cross-linking bond between the side chains (the ink for ink-jet recording will be described in detail later) And the cross-linking bond is formed by irradiating active energy rays. After the ink jet ink has landed on the recording material, the ink jet ink is 210 nm to 280 nm. It was found that the above-mentioned various problems can be overcome by curing with the active energy ray emitted from the light source having the highest illuminance in the above range.

  The polymer compound has a plurality of side chains in the hydrophilic main chain, but the crosslinks are formed between the side chains by irradiating active energy rays, so that the ink itself is printed on the recording medium after printing. It is possible to effectively suppress the occurrence of color mixing between different colors (color bleed) and mottle (beading) due to ink overflow due to thickening (gelation) by the curing reaction. As a result, it is possible to perform direct printing on a recording medium having little ink absorbability, and further, direct printing on a recording medium having no ink absorbability.

  In the past, there was a technology that puts a component that can be cured with active energy rays into the ink in this way, but the component to be cured is a monomer, which is inefficient in energy. It was not possible to print directly on the recording medium. For this reason, the swell of the image portion is increased, and an image having a high smoothness cannot be obtained.

  In the present invention, a small amount of the curing component is sufficient, and the total solid content in the ink can be suppressed to about 10% by mass. Therefore, the rise of the image portion after the volatile component is volatilized can be made extremely thin. Therefore, it is possible to print an image with high image quality and high smoothness as it is on a recording medium having low or no absorbency such as printing paper.

  Further, when the ink is ejected onto the recording material, after the ink has landed on the recording material, the ink is cured by irradiation with an active energy ray emitted from a light source having a maximum illuminance between 210 nm and 280 nm. It was found that density unevenness and gloss unevenness can be remarkably improved.

  This is because when the main wavelength of the active energy ray is adjusted to the range of 210 nm to 280 nm, the curing (gelation) reaction by the irradiation of the active energy ray after ink ejection is controlled, and the colorant and the polymer compound as the curing component are mixed. This is thought to be because the condition has improved.

"light source"
The light source according to the present invention will be described.

  The light source according to the present invention has the highest illuminance in the wavelength range of 210 nm to 280 nm, and such a light source was adjusted to have the highest illuminance at 210 nm to 280 nm by a low-pressure mercury lamp, an ultraviolet light emitting diode, or a filter. There are high-pressure mercury lamps and metal halide lamps. Among these, a lamp in which a plurality of ultraviolet light emitting diodes are arranged is preferable from the viewpoint of compactness of the apparatus.

  The ultraviolet light-emitting diode is preferably a light-emitting diode using a diamond thin film as a light-emitting element. For example, LEDs using a diamond thin film as a light-emitting element are already known, and these known LEDs can be used. . Specifically, the LED manufactured by Kobe Steel, such as that introduced in the 46th Applied Physics-related Federation Lecture Meeting (Spring 1999), p.629, can be mentioned.

  The lamps composed of ultraviolet light emitting diodes having the maximum illuminance between 210 nm and 280 nm may be arranged at both ends of the carriage housing the ink jet recording head, and in the vicinity of each ink jet recording head that discharges a plurality of colors of ink. (Also referred to as horizontal) may be disposed respectively, or when the ink jet recording head is of a line head type, it may be disposed downstream of the ink jet recording head.

Furthermore, as a light emitting diode having the highest illuminance between 210 nm and 280 nm, diamond doped with boron at a high concentration of 3 × 10 ²⁰ cm ⁻³ or more exhibits ultraviolet light emission having a peak at 248 nm (5.00 eV). As already known, this luminescence has the feature that there is no decrease in intensity even at room temperature, unlike ordinary exciton luminescence. Especially, it has a low solid content, contains water, and a crosslink is formed by active energy rays. It is suitable for inkjet image recording using so-called curable ink.

(Active energy ray irradiation conditions)
In the ink jet recording method of the present invention, the active energy ray is emitted from the light emitting diode having the highest illuminance at 210 nm to 280 nm, and the active energy is from 0.001 second to 1.0 second after the landing of the ink for ink jet. It is preferable to irradiate a line, and the conditions defined in the present invention can be satisfied with the configuration described in FIGS. The above condition can be achieved by providing a lamp in which a plurality of light emitting diodes according to the present invention are arranged between the respective color heads. In order to form a high-definition image, it is particularly important that the irradiation timing is as early as possible.

  Conventionally, in an ink jet recording system, a light source with high illuminance in which the total power consumption of a lamp (light source) exceeds 1 kW · hr is usually used in order to suppress dot spreading and bleeding after ink landing.

<Activity energy rays (also called actinic rays)>
The active energy ray according to the present invention will be described.

  There are various active energy rays according to the ink jet recording method of the present invention, such as an electron beam, alpha rays, ultraviolet rays, and visible light. In the present invention, ultraviolet rays are most preferable. Specifically, the active energy ray is used for forming a cross-linking bond between side chains of a polymer compound described later in the inkjet ink.

<Inkjet ink (also referred to as inkjet recording ink)>
The inkjet ink according to the present invention contains at least a colorant, water, and a polymer compound having a plurality of side chains in a hydrophilic main chain and capable of forming a cross-linking bond between the side chains. Features. Hereinafter, each element forming the ink will be described.

<< Polymer Compound >>: A cross-linking bond is formed between side chains by active energy rays. The polymer compound according to the present invention will be described.

  The polymer compound having a plurality of side chains in the hydrophilic main chain according to the present invention and capable of crosslinking between the side chains by irradiating with active energy rays is a saponified product of polyvinyl acetate, polyvinyl acetal, polyethylene Oxide, polyalkylene oxide, polyvinylpyrrolidone, polyacrylamide, polyacrylic acid, hydroxyethyl cellulose, methyl cellulose, hydroxypropyl cellulose, or a derivative of the hydrophilic resin, and at least one hydrophilic selected from the group consisting of these copolymers In the resin, a modified group such as a photodimerization type, a photodecomposition type, a photopolymerization type, a photomodification type, or a photodepolymerization type is introduced into the side chain. Photopolymerizable crosslinkable groups are desirable from the viewpoints of sensitivity and performance of the generated image.

(Saponification degree and average polymerization degree of hydrophilic main chain of polymer compound)
In the hydrophilic main chain, a saponified product of polyvinyl acetate is preferable from the viewpoint of ease of introduction of side chains and handling, and the degree of saponification defined by JIS K 6726-1994 is 77 mol% to It is preferable that it is 99 mol% and average polymerization degree is 200-4000.

  Furthermore, the average degree of polymerization is more preferably in the range of 200 to 2000 from the viewpoint of handling.

(Modification rate of side chain to hydrophilic main chain of polymer compound)
The modification rate of the side chain with respect to the main chain is preferably 0.3 mol% to 4 mol%, and more preferably 0.8 mol% to 4 mol% from the viewpoint of reactivity.

  As the photodimerization-type modifying group, those having a diazo group, a cinnamoyl group, a stilbazolium group, a stilquinolium group or the like are preferably used. For example, a photosensitive resin described in JP-A-60-129742 (Composition).

  The photosensitive resin described in JP-A-60-129742 is preferably a compound represented by the following general formula (1) in which a stilbazolium group is introduced into a polyvinyl alcohol structure.

In the formula, R ₁ represents an alkyl group having 1 to 4 carbon atoms, and A ⁻ represents a counter anion. The photosensitive resin described in JP-A-56-67309 includes a 2-azido-5-nitrophenylcarbonyloxyethylene structure represented by the following general formula (2) in the polyvinyl alcohol structure, or the following general formula. This is a resin composition represented by (3) and having a 4-azido-3-nitrophenylcarbonyloxyethylene structure.

  Further, a modifying group represented by the following general formula (4) is also preferably used.

  In the formula, R represents an alkylene group or an aromatic ring. A benzene ring is preferred.

  As the photopolymerization type modifying group, for example, a resin represented by the following general formula (5) shown in JP-A Nos. 2000-181062 and 2004-189841 is preferable from the viewpoint of reactivity.

In the formula, R ₂ represents a methyl group or a hydrogen atom, n represents 1 or 2, X represents — (CH ₂ ) _m —COO— or —O—, and Y represents an aromatic ring or a single bond. M represents an integer of 0-6. Moreover, it is also preferable to use the photopolymerization type | mold modified group represented by following General formula (6) described in Unexamined-Japanese-Patent No. 2004-161942 for a conventionally well-known water-soluble resin.

In the formula, R ₃ represents a methyl group or a hydrogen atom, and R ₄ represents a linear or branched alkylene group having 2 to 10 carbon atoms.

  Such an active energy ray cross-linking resin is preferably contained in an amount of 0.8% by mass to 5.0% by mass with respect to the total mass of the ink. The presence of 0.8% by mass or more improves cross-linking efficiency, and beading and color bleeding are more preferable due to a rapid increase in ink viscosity after cross-linking. In the case of 5.0% by mass or less, it is difficult to adversely affect the physical properties of the ink and the state in the ink head, which is preferable from the viewpoints of light emission properties and ink storage stability.

  In the polymer compound according to the present invention (also referred to as active energy ray-crosslinked resin), the main chain originally having a certain degree of polymerization is cross-linked through a cross-link between the side chains. The effect of increasing the molecular weight per photon is remarkably large for an active energy ray-curable resin that polymerizes via a simple chain reaction. On the other hand, in the conventionally known active energy ray curable resins, the number of crosslinking points cannot be controlled, so the physical properties of the cured film cannot be controlled, and the film tends to be hard and brittle.

  In the resin used in the present invention, the number of crosslinking points can be completely controlled by the length of the hydrophilic main chain and the amount of side chains introduced, and the physical properties of the ink film can be controlled according to the purpose.

  Furthermore, in the conventionally known active energy ray-curable ink, almost all of the ink other than the colorant is curable, so that the dots after curing rise and the image quality represented by gloss is inferior. When a molecular compound is used, only a small amount is required, and since there are many dry components, the image quality after drying is improved and the fixing property is good.

(Photopolymerization initiator, sensitizer)
In the present invention, it is also preferable to add a photopolymerization initiator or a sensitizer. These compounds may be dissolved or dispersed in a solvent, or may be chemically bonded to the photosensitive resin. There is no restriction | limiting in particular about the photoinitiator and photosensitizer which are applied, A conventionally well-known thing can be used.

  Although there is no restriction | limiting in particular about the photoinitiator and photosensitizer which are applied, A water-soluble thing is preferable from a viewpoint of mixability and reaction efficiency. In particular, 4- (2-hydroxyethoxy) phenyl- (2-hydroxy-2-propyl) ketone (HMPK), thioxanthone ammonium salt (QTX), and benzophenone ammonium salt (ABQ) are preferable from the viewpoint of miscibility with an aqueous solvent.

  Furthermore, 4- (2-hydroxyethoxy) phenyl- (2-hydroxy-2-propyl) ketone (n = 1, HMPK) represented by the following general formula (7) from the viewpoint of compatibility with the resin, The ethylene oxide adduct (n = 2 to 5) is more preferable.

  In the formula, n represents an integer of 1 to 5.

  Other examples include benzophenones such as benzophenone, hydroxybenzophenone, bis-N, N-dimethylaminobenzophenone, bis-N, N-diethylaminobenzophenone, 4-methoxy-4'-dimethylaminobenzophenone. Thioxanthones such as thioxatone, 2,4-diethylthioxanthone, isopropylthioxanthone, chlorothioxanthone, and isopropoxychlorothioxanthone. Anthraquinones such as ethyl anthraquinone, benzanthraquinone, aminoanthraquinone and chloroanthraquinone. Acetophenones. Benzoin ethers such as benzoin methyl ether. 2,4,6-trihalomethyltriazines, 1-hydroxycyclohexyl phenyl ketone, 2- (o-chlorophenyl) -4,5-diphenylimidazole dimer, 2- (o-chlorophenyl) -4,5-di ( m-methoxyphenyl) imidazole dimer, 2- (o-fluorophenyl) -4,5-phenylimidazole dimer, 2- (o-methoxyphenyl) -4,5-phenylimidazole dimer, 2- (P-methoxyphenyl) -4,5-diphenylimidazole dimer, 2, -di (p-methoxyphenyl) -5-phenylimidazole dimer, 2- (2,4-dimethoxyphenyl) -4,5 -2,4,5-triarylimidazole dimer of diphenylimidazole dimer, benzyldimethyl ketal, 2-benzyl-2-dimethyl Amino-1- (4-morpholinophenyl) butan-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-1-propanone, 2-hydroxy-2-methyl-1-phenyl -Propan-1-one, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one, phenanthrenequinone, 9,10-phenanthrenequinone, Benzoins such as methylbenzoin and ethylbenzoin, 9-phenylacridine, acridine derivatives such as 1,7-bis (9,9'-acridinyl) heptane, bisacylphosphine oxide, and mixtures thereof are preferably used. May be used alone or in combination.

  In addition to these photopolymerization initiators, accelerators and the like can also be added. Examples of these include ethyl p-dimethylaminobenzoate, isoamyl p-dimethylaminobenzoate, ethanolamine, diethanolamine, triethanolamine and the like.

  These photopolymerization initiators may be grafted on the side chains with respect to the hydrophilic main chain.

<< Coloring material (also called coloring agent, coloring agent, etc.) >>
As the color material used in the ink jet ink of the present invention, it is preferable to use a dye or a pigment.

"dye"
There is no restriction | limiting in particular as dye which can be used by this invention, Water-soluble dyes, such as an acid dye, a direct dye, and a reactive dye, a disperse dye, etc. are mentioned.

  Specific examples of dyes applicable to the ink jet ink of the present invention are listed below, but the present invention is not limited to these exemplified dyes.

(Water-soluble dye)
Examples of water-soluble dyes that can be used in the present invention include azo dyes, methine dyes, azomethine dyes, xanthene dyes, quinone dyes, phthalocyanine dyes, triphenylmethane dyes, and diphenylmethane dyes.

<C. I. Acid Yellow>
1, 3, 11, 17, 18, 19, 23, 25, 36, 38, 40, 42, 44, 49, 59, 61, 65, 67, 72, 73, 79, 99, 104, 110, 114, 116, 118, 121, 127, 129, 135, 137, 141, 143, 151, 155, 158, 159, 169, 176, 184, 193, 200, 204, 207, 215, 219, 220, 230, 232, 235, 241, 242, 246,
<C. I. Acid Orange>
3, 7, 8, 10, 19, 24, 51, 56, 67, 74, 80, 86, 87, 88, 89, 94, 95, 107, 108, 116, 122, 127, 140, 142, 144, 149, 152, 156, 162, 166, 168,
<C. I. Acid Red>
88, 97, 106, 111, 114, 118, 119, 127, 131, 138, 143, 145, 151, 183, 195, 198, 211, 215, 217, 225, 226, 249, 251, 254, 256, 257, 260, 261, 265, 266, 274, 276, 277, 289, 296, 299, 315, 318, 336, 337, 357, 359, 361, 362, 364, 366, 399, 407, 415,
<C. I. Acid Violet>
17, 19, 21, 42, 43, 47, 48, 49, 54, 66, 78, 90, 97, 102, 109, 126,
<C. I. Acid Blue>
1, 7, 9, 15, 23, 25, 40, 62, 72, 74, 80, 83, 90, 92, 103, 104, 112, 113, 114, 120, 127, 128, 129, 138, 140, 142, 156, 158, 171, 182, 185, 193, 199, 201, 203, 204, 205, 207, 209, 220, 221, 224, 225, 229, 230, 239, 249, 258, 260, 264, 278, 279, 280, 284, 290, 296, 298, 300, 317, 324, 333, 335, 338, 342, 350,
<C. I. Acid Green>
9, 12, 16, 19, 20, 25, 27, 28, 40, 43, 56, 73, 81, 84, 104, 108, 109,
<C. I. Acid Brown>
2, 4, 13, 14, 19, 28, 44, 123, 224, 226, 227, 248, 282, 283, 289, 294, 297, 298, 301, 355, 357, 413, <C. I. Acid Black>
1, 2, 3, 24, 26, 31, 50, 52, 58, 60, 63, 107, 109, 112, 119, 132, 140, 155, 172, 187, 188, 194, 207, 222,
<C. I. Direct yellow>
8, 9, 10, 11, 12, 22, 27, 28, 39, 44, 50, 58, 79, 86, 87, 98, 105, 106, 130, 132, 137, 142, 147, 153,
<C. I. Direct orange>
6, 26, 27, 34, 39, 40, 46, 102, 105, 107, 118,
<C. I. Direct Red>
2, 4, 9, 23, 24, 31, 54, 62, 69, 79, 80, 81, 83, 84, 89, 95, 212, 224, 225, 226, 227, 239, 242, 243, 254,
<C. I. Direct Violet>
9, 35, 51, 66, 94, 95,
<C. I. Direct Blue>
1, 15, 71, 76, 77, 78, 80, 86, 87, 90, 98, 106, 108, 160, 168, 189, 192, 193, 199, 200, 201, 202, 203, 218, 225, 229, 237, 244, 248, 251, 270, 273, 274, 290, 291,
<C. I. Direct Green>
26, 28, 59, 80, 85,
<C. I. Direct Brown>
44, 106, 115, 195, 209, 210, 222, 223,
<C. I. Direct Black>
17, 19, 22, 32, 51, 62, 108, 112, 113, 117, 118, 132, 146, 154, 159, 169,
<C. I. Basic Yellow>
1, 2, 11, 13, 15, 19, 21, 28, 29, 32, 36, 40, 41, 45, 51, 63, 67, 70, 73, 91,
<C. I. Basic Orange>
2, 21, 22,
<C. I. Basic Red>
1, 2, 12, 13, 14, 15, 18, 23, 24, 27, 29, 35, 36, 39, 46, 51, 52, 69, 70, 73, 82, 109,
<C. I. Basic Violet>
1, 3, 7, 10, 11, 15, 16, 21, 27, 39,
<C. I. Basic Blue>
1, 3, 7, 9, 21, 22, 26, 41, 45, 47, 52, 54, 65, 69, 75, 77, 92, 100, 105, 117, 124, 129, 147, 151,
<C. I. Basic Green>
1, 4,
<C. I. Basic Brown>
1,
<C. I. Reactive Yellow>
2, 3, 7, 15, 17, 18, 22, 23, 24, 25, 27, 37, 39, 42, 57, 69, 76, 81, 84, 85, 86, 87, 92, 95, 102, 105, 111, 125, 135, 136, 137, 142, 143, 145, 151, 160, 161, 165, 167, 168, 175, 176,
<C. I. Reactive Orange>
1, 4, 5, 7, 11, 12, 13, 15, 16, 20, 30, 35, 56, 64, 67, 69, 70, 72, 74, 82, 84, 86, 87, 91, 92, 93, 95, 107,
<C. I. Reactive Red>
2, 3, 5, 8, 11, 21, 22, 23, 24, 28, 29, 31, 33, 35, 43, 45, 49, 55, 56, 58, 65, 66, 78, 83, 84, 106, 111, 112, 113, 114, 116, 120, 123, 124, 128, 130, 136, 141, 147, 158, 159, 171, 174, 180, 183, 184, 187, 190, 193, 194, 195, 198, 218, 220, 222, 223, 228, 235,
<C. I. Reactive Violet>
1, 2, 4, 5, 6, 22, 23, 33, 36, 38,
<C. I. Reactive Blue>
2, 3, 4, 5, 7, 13, 14, 15, 19, 21, 25, 27, 28, 29, 38, 39, 41, 49, 50, 52, 63, 69, 71, 72, 77, 79, 89, 104, 109, 112, 113, 114, 116, 119, 120, 122, 137, 140, 143, 147, 160, 161, 162, 163, 168, 171, 176, 182, 184, 191, 194, 195, 198, 203, 204, 207, 209, 211, 214, 220, 221, 222, 231, 235, 236,
<C. I. Reactive Green>
8, 12, 15, 19, 21,
<C. I. Reactive Brown>
2, 7, 9, 10, 11, 17, 18, 19, 21, 23, 31, 37, 43, 46,
<C. I. Reactive Black>
5, 8, 13, 14, 31, 34, 39,
<C. I. Food Black>
1, 2,
Etc.

  Furthermore, examples of the dye include a compound represented by the following general formula (8) or a compound represented by the general formula (9).

In the general formula (8), R ₁ represents a hydrogen atom or a substituent, and is preferably a hydrogen atom or a phenylcarbonyl group. R ₂ may be different and represents a hydrogen atom or a substituent, preferably a hydrogen atom. R ₃ represents a hydrogen atom or a substituent, and preferably a hydrogen atom or an alkyl group.

R ₄ represents a hydrogen atom or a substituent, preferably a hydrogen atom or an aryloxy group. R ₅ may be different and represents a hydrogen atom or a substituent, and is preferably a sulfonic acid group. n represents an integer of 1 to 4, and m represents an integer of 1 to 5.

In the general formula (9), X represents a phenyl group or a naphthyl group, may be substituted with a substituent, and is preferably substituted with a sulfonic acid group or a carboxyl group. Y represents hydrogen ion, sodium ion, potassium ion, lithium ion, ammonium ion or alkylammonium ion. R _e may be different and represents a hydrogen atom or a substituent. q represents 1 or 2. p represents an integer of 1 to 4. However, q + p = 5. Z represents a substituent, and represents a carboxyl group, an alkylsulfonyl group, an arylsulfonyl group or a group represented by the following general formula (10), and particularly preferably a group represented by the following general formula (10).

In the general formula (10), W ₁ and W ₂ each independently represent a halogen atom, an amino group, a hydroxy group, an alkylamino group or an arylamino group, and among them, a halogen atom, a hydroxy group or an alkylamino group is preferable.

《Disperse dye》
The disperse dye used in the present invention will be described.

  As the disperse dye, various disperse dyes such as azo disperse dyes, quinone disperse dyes, anthraquinone disperse dyes, dyes, and quinophthalone disperse dyes can be used, and specific compounds thereof are listed below.

<C. I. Disperse Yellow>
3, 4, 5, 7, 9, 13, 23, 24, 30, 33, 34, 42, 44, 49, 50, 51, 54, 56, 58, 60, 63, 64, 66, 68, 71, 74, 76, 79, 82, 83, 85, 86, 88, 90, 91, 93, 98, 99, 100, 104, 108, 114, 116, 118, 119, 122, 124, 126, 135, 140, 141, 149, 160, 162, 163, 164, 165, 179, 180, 182, 183, 184, 186, 192, 198, 199, 202, 204, 210, 211, 215, 216, 218, 224, 227, 231, 232,
<C. I. Disperse Orange>
1, 3, 5, 7, 11, 13, 17, 20, 21, 25, 29, 30, 31, 32, 33, 37, 38, 42, 43, 44, 45, 47, 48, 49, 50, 53, 54, 55, 56, 57, 58, 59, 61, 66, 71, 73, 76, 78, 80, 89, 90, 91, 93, 96, 97, 119, 127, 130, 139, 142,
<C. I. Disperse Red>
1, 4, 5, 7, 11, 12, 13, 15, 17, 27, 43, 44, 50, 52, 53, 54, 55, 56, 58, 59, 60, 65, 72, 73, 74, 75, 76, 78, 81, 82, 86, 88, 90, 91, 92, 93, 96, 103, 105, 106, 107, 108, 110, 111, 113, 117, 118, 121, 122, 126, 127, 128, 131, 132, 134, 135, 137, 143, 145, 146, 151, 152, 153, 154, 157, 159, 164, 167, 169, 177, 179, 181, 183, 184, 185, 188, 189, 190, 191, 192, 200, 201, 202, 203, 205, 206, 207, 210, 221, 224, 225, 227, 229, 23 , 240,257,258,277,278,279,281,288,298,302,303,310,311,312,320,324,328,
<C. I. Disperse Violet>
1, 4, 8, 23, 26, 27, 28, 31, 33, 35, 36, 38, 40, 43, 46, 48, 50, 51, 52, 56, 57, 59, 61, 63, 69, 77,
<C. I. Disperse Green>
9,
<C. I. Disperse Brown>
1, 2, 4, 9, 13, 19,
<C. I. Disperse Blue>
3, 7, 9, 14, 16, 19, 20, 26, 27, 35, 43, 44, 54, 55, 56, 58, 60, 62, 64, 71, 72, 73, 75, 79, 81, 82, 83, 87, 91, 93, 94, 95, 96, 102, 106, 108, 112, 113, 115, 118, 120, 122, 125, 128, 130, 139, 141, 142, 143, 146, 148, 149, 153, 154, 158, 165, 167, 171, 173, 174, 176, 181, 183, 185, 186, 187, 189, 197, 198, 200, 201, 205, 207, 211, 214, 224, 225, 257, 259, 267, 268, 270, 284, 285, 287, 288, 291, 293, 295, 297, 301, 315, 3 0,333,
<C. I. Disperse Black>
1, 3, 10, 24
Etc.

<Pigment>
As the pigment that can be used in the present invention, conventionally known organic and inorganic pigments can be used, but they are anionic pigments. For example, azo pigments such as azo lakes, insoluble azo pigments, condensed azo pigments, chelate azo pigments, phthalocyanine pigments, perylene and perylene pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments, thioindigo pigments, isoindolinone pigments, quinophthalone pigments, etc. Examples include cyclic pigments, dye lakes such as acid dye lakes, organic pigments such as nitro pigments, nitroso pigments, aniline black, and daylight fluorescent pigments, and inorganic pigments such as carbon black.

  Specific organic pigments are exemplified below.

  Examples of pigments for magenta or red include C.I. I. Pigment red 2, C.I. I. Pigment red 3, C.I. I. Pigment red 5, C.I. I. Pigment red 6, C.I. I. Pigment red 7, C.I. I. Pigment red 15, C.I. I. Pigment red 16, C.I. I. Pigment red 48: 1, C.I. I. Pigment red 53: 1, C.I. I. Pigment red 57: 1, C.I. I. Pigment red 122, C.I. I. Pigment red 123, C.I. I. Pigment red 139, C.I. I. Pigment red 144, C.I. I. Pigment red 149, C.I. I. Pigment red 166, C.I. I. Pigment red 177, C.I. I. Pigment red 178, C.I. I. And CI Pigment Red 222.

  Examples of orange pigments or yellow pigments include C.I. I. Pigment orange 31, C.I. I. Pigment orange 43, C.I. I. Pigment yellow 12, C.I. I. Pigment yellow 13, C.I. I. Pigment yellow 14, C.I. I. Pigment yellow 15, C.I. I. Pigment yellow 17, C.I. I. Pigment yellow 74, C.I. I. Pigment yellow 93, C.I. I. Pigment yellow 94, C.I. I. Pigment yellow 128, C.I. I. And CI Pigment Yellow 138.

  Examples of green pigments or cyan pigments include C.I. I. Pigment blue 15, C.I. I. Pigment blue 15: 2, C.I. I. Pigment blue 15: 3, C.I. I. Pigment blue 16, C.I. I. Pigment blue 60, C.I. I. And CI Pigment Green 7.

(Pigment dispersion method)
As a method for dispersing the pigment, for example, various dispersing machines such as a ball mill, a sand mill, an attritor, a roll mill, an agitator, a Henschel mixer, a colloid mill, an ultrasonic homogenizer, a pearl mill, a wet jet mill, and a paint shaker can be used. It is also preferable to use a centrifugal separator or a filter for the purpose of removing the coarse particles of the pigment dispersion.

  In the ink according to the present invention, a self-dispersed pigment in which polar groups such as sulfonic acid and carboxylic acid are pendant on the pigment surface, or a pigment dispersed using a polymer dispersant is preferable.

  The polymer dispersant according to the present invention is not particularly limited, and a water-soluble resin or a water-insoluble resin is used. Examples of these polymers include styrene, styrene derivatives, vinyl naphthalene derivatives, acrylic acid, acrylic acid derivatives, methacrylic acid, methacrylic acid derivatives, maleic acid, maleic acid derivatives, itaconic acid, itaconic acid derivatives, fumaric acid, fumaric acid. Examples thereof include a polymer composed of a single monomer selected from acid derivatives, a copolymer composed of two or more monomers, and salts thereof. Water-soluble polymers such as polyvinyl alcohol, polyvinyl pyrrolidone, cellulose derivatives, gelatin, and polyethylene glycol can also be used.

  The content of these water-soluble resins with respect to the total amount of ink is preferably 0.1% by mass to 10% by mass, and more preferably 0.3% by mass to 5% by mass. These water-soluble resins can be used in combination of two or more.

  The average particle diameter of the pigment dispersion used in the inkjet ink of the present invention is preferably 500 nm or less, more preferably 200 nm or less, from the viewpoint of improving the stability of the pigment dispersion and improving the storage stability of the resulting ink. It is preferably 10 nm or more and 200 nm or less, and more preferably 10 nm or more and 150 nm or less.

(Measurement of particle size of pigment dispersion)
The particle size of the pigment dispersion can be determined by a commercially available particle size measuring device using a light scattering method, an electrophoresis method, a laser Doppler method or the like. It is also possible to obtain a particle image with a transmission electron microscope on at least 100 particles and perform statistical processing on the image using image analysis software such as Image-Pro (manufactured by Media Cybernetics). Is possible.

(Pigment dispersion method)
Various methods such as a ball mill, a sand mill, an attritor, a roll mill, an agitator, a Henschel mixer, a colloid mill, an ultrasonic homogenizer, a pearl mill, a wet jet mill, and a paint shaker can be used as a pigment dispersion method.

(Water-soluble solvent)
As the solvent according to the present invention, an aqueous liquid medium is preferably used, and as the aqueous liquid medium, a mixed solvent such as water and a water-soluble organic solvent is further preferably used. Examples of water-soluble organic solvents that are preferably used include alcohols (eg, methanol, ethanol, propanol, isopropanol, butanol, isobutanol, secondary butanol, tertiary butanol), polyhydric alcohols (eg, ethylene glycol, diethylene glycol, Triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, butylene glycol, hexanediol, pentanediol, glycerin, hexanetriol, thiodiglycol), polyhydric alcohol ethers (eg, ethylene glycol monomethyl ether, ethylene Glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol Nomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monobutyl ether, ethylene glycol monomethyl ether acetate, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether, ethylene glycol Monophenyl ether, propylene glycol monophenyl ether), amines (for example, ethanolamine, diethanolamine, triethanolamine, N-methyldiethanolamine, N-ethyldiethanolamine, morpholine, N-ethylmorpholine, ethylenediamine, diethylenediamine, triethylenetetra) , Tetraethylenepentamine, polyethyleneimine, pentamethyldiethylenetriamine, tetramethylpropylenediamine), amides (eg, formamide, N, N-dimethylformamide, N, N-dimethylacetamide, etc.), heterocycles (eg, 2 -Pyrrolidone, N-methyl-2-pyrrolidone, cyclohexyl pyrrolidone, 2-oxazolidone, 1,3-dimethyl-2-imidazolidinone), sulfoxides (for example, dimethyl sulfoxide) and the like.

(Surfactant)
Surfactants preferably used in the ink of the present invention include alkyl sulfates, alkyl ester sulfates, dialkyl sulfosuccinates, alkyl naphthalene sulfonates, alkyl phosphates, polyoxyalkylene alkyl ether phosphates, fatty acids. Anionic surfactants such as salts, nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyalkylene alkyl phenyl ethers, acetylene glycols, polyoxyethylene-polyoxypropylene block copolymers, glycerin esters, sorbitan Activators such as esters, polyoxyethylene fatty acid amides and amine oxides, and cationic surfactants such as alkylamine salts and quaternary ammonium salts.

  These surfactants can also be used as pigment dispersants, and in particular, anionic and nonionic surfactants can be preferably used.

(Various additives)
In the present invention, other conventionally known additives can be contained. For example, optical brighteners, antifoaming agents, lubricants, preservatives, thickeners, antistatic agents, matting agents, water-soluble polyvalent metal salts, acid bases, pH adjusters such as buffer solutions, antioxidants, surface tension It is a regulator, a non-resistance modifier, a rust inhibitor, an inorganic pigment, and the like.

(Recording sheet): the paper referred to as a recording material, coated paper, there is a non-coated paper, the coated paper, the coated amount per 1 m ² is one side 20g around the art paper, per 1 m ² coating coated amount on one side 10g before and after the coated paper, the coating amount per 1m ² is one side 5g before and after of lightweight coated paper, Binurikoshi, mat coated paper matte finish, Darukoto paper of dull finish, and newsprint I can list them. Non-coated paper includes printing paper A using 100% chemical pulp, printing paper B using 70% or more chemical pulp, printing paper C using 40% or more and less than 70% chemical pulp, and printing using less than 40% chemical pulp. Examples thereof include paper D, gravure paper containing mechanical pulp and subjected to calendar treatment. Further details are described in detail in the “Latest Paper Processing Handbook” edited by the Paper Processing Handbook Editorial Committee, published by Tech Times, “Printing Engineering Handbook” edited by the Japan Printing Society.

  The plain paper is 80 μm to 200 μm uncoated paper belonging to a part of uncoated paper, special printing paper and information paper. The plain paper used in the present invention includes, for example, high-grade printing paper, intermediate-grade printing paper, low-grade printing paper, thin-like printing paper, fine-coating printing paper, special printing paper such as fine-quality printing paper, foam paper, PPC paper, and others There are information sheets and the like. Specifically, there are the following sheets and various modified / processed sheets using these sheets, but the present invention is not particularly limited thereto. High quality paper and colored high quality paper, recycled paper, copy paper / colored paper, OCR paper, carbonless paper / colored paper, synthetic paper such as YUPO 60, 80, 110 microns, YUPO COAT 70, 90 microns, etc. Coated paper 90kg, Foam mat paper 70, 90, 110kg, Foamed PET 38 microns, Mitsuori-kun (above, Kobayashi recording paper), OK fine paper, New OK fine paper, Sunflower, Phoenix, OK Royal White, Export fine paper ( NPP, NCP, NWP, Royal White) OK Book Paper, OK Cream Book Paper, Cream Premium Paper, OK Map Paper, OK Ishikari, Cucumber, OK Foam, OKH, NIP-N (above, Shin Oji Paper), Gold Wang, Toko, export quality paper, special demand quality paper, book paper, book paper L, light cream book paper, elementary textbook Paper, continuous slip paper, high quality NIP paper, silver ring, gold yang, gold yang (W), bridge, capital, silver ring book, harp, harp cream, SK color, securities paper, opera cream, opera, KYP medical record, silvia HN, Excellent Foam, NPI Foam DX (Nippon Paper), Pearl, Kinryo, Uscream fine paper, Special Book Paper, Super Book Paper, Book Paper, Diamond Foam, Inkjet Foam (Mitsubishi Paper), Carpet V, carpet SW, white elephant, luxury publication paper, cream carpet, cream white elephant, securities / voucher paper, book paper, map paper, copy paper, HNF (above, Hokuetsu), phone book cover, Book paper, cream shirairai, cream shirairaifu, cream shirairaifu, DSK (above, Daishowa Paper), Sendai MP fine paper, Jiang, Thunderbird quality, hanging paper, colored paper base, dictionary paper, cream book, white book, cream quality paper, map paper, continuous slip paper (above, Chuetsu Pulp), OP gold cherry (Chuetsu), gold sand, reference book paper, Replacement certificate paper (white), form printing paper, KRF, white foam, color foam, (K) NIP, fine PPC, Kishu inkjet paper (above, made by Kishu Paper), Taiou, Bright Foam, Kant, Kant White, Dante , CM paper, Dante comic, Heine, paperback book paper, Heine S, New AD paper, Utrilo Excel, Excel Super A, Kant Excel, Excel Super B, Dante Excel, Heine Excel, Excel Super C, Excel Super D, AD Excel, Excel Super E, New Bright Foam, New Bright NI P (above, made by Daio Paper), Sun Ring, Moon Ring, Cloud Pass, Galaxy, Baiyun, Wyeth, Moon Ring Ace, Baiyun Ace, Cloud Pass Ace (above, Nippon Paper Industries), Taiou, Bright Foam, Bright Nip (Nagoya Pulp), Peony A, Golden Pigeon, Special Peony, White Peony A, White Peony C, Silver Pigeon, Super White Peony A, Light Cream White Peony, Special Medium Quality Paper, White Pigeon, Super Medium Quality Paper, Blue Pigeon, Red Pigeon, Gold Pigeon M Snow Vision, Snow Vision, Gold Pigeon Snow Vision, White Pigeon M, Super DX, Hamanasu O, Red Pigeon M, HK Super Printing Paper (Made by Honshu Paper), Stalinden (A・ AW), Star Elm, Star Maple, Star Laurel, Star Poplar, MOP, Star Cherry I, Cherry I Super, Cherry II Super, Star Cherry III, Star Cherry IV, Cherry III Super, Cheri -IV Super (above, made by Maruzumi Paper), SHF (above, made by Toyo Pulp), TRP (above, made by Tokai Pulp), etc.

(Various films)
As the various films, all commonly used films can be used. For example, there are a polyester film, a polyolefin film, a polyvinyl chloride film, a polyvinylidene chloride film, and the like. Resin-coated paper that is photographic printing paper or YUPO paper that is synthetic paper can also be used.

(Various ink jet recording media)
As the various ink jet recording media, an ink receiving layer is formed on the surface using an absorbent support or a non-absorbent support as a base material. Examples of the ink receiving layer include a coating layer, a swelling layer, and a fine void layer.

  The swelling layer absorbs ink when the ink receiving layer made of a water-soluble polymer swells. The fine void layer is composed of inorganic or organic fine particles having a secondary particle size of about 20 nm to 200 nm and a binder, and fine voids of about 100 nm absorb ink.

  In recent years, an inkjet recording medium in which the above-mentioned fine void layer is provided on a base material using RC paper in which both sides of a paper base material are coated with an olefin resin is preferably used in terms of photographic images.

<Inkjet recording device>
An ink jet recording apparatus used in the ink jet recording method of the present invention will be described with reference to the drawings as appropriate. Note that the ink jet recording apparatus illustrated in the drawings is only one aspect of the ink jet recording apparatus that can be used in the ink jet recording method of the present invention, and the present invention is not limited to this drawing.

  FIG. 1 is a front view showing an example of a configuration of a main part of an ink jet recording apparatus that can be used in the ink jet recording method of the present invention.

  The ink jet recording apparatus 1 includes a head carriage 2, an ink jet recording head 3, an irradiation unit 4 that is a lamp in which a plurality of light emitting diodes having the highest illuminance are arranged on 210 nm to 280 nm, a platen unit 5, and the like. In the ink jet recording apparatus 1, a platen unit 5 is installed under a recording material P. The platen unit 5 has a function of absorbing ultraviolet rays used as active energy rays, and absorbs excess ultraviolet rays that have passed through the recording material P. As a result, a high-definition image can be reproduced very stably.

  The recording material P is guided by the guide member 6 and moves from the near side to the far side in FIG. 1 by the operation of the conveying means (not shown). The head scanning means (not shown) scans the ink jet recording head 3 held by the head carriage 2 by reciprocating the head carriage 2 in the Y direction in FIG.

  The head carriage 2 is installed on the upper side of the recording material P, and accommodates a plurality of ink jet recording heads 3 and an ink discharge port 31 on the lower side according to the number of colors used for image printing on the recording material P. The head carriage 2 is installed on the main body of the ink jet recording apparatus 1 in such a manner that it can reciprocate in the Y direction in FIG. 1, and reciprocates in the Y direction in FIG. 1 by driving the head scanning means.

  In FIG. 1, the head carriage 2 is white (W), yellow (Y), magenta (M), cyan (C), black (K), light yellow (Ly), light magenta (Lm), and light cyan (Lc). In the drawing, each of the inkjet recording heads 3 for light black (Lk) and white (W) is drawn. However, the number of colors of the inkjet recording head 3 accommodated in the head carriage 2 is as follows. Can be determined as appropriate. Further, an irradiation unit 4 (lamp) may be provided between the respective ink jet recording heads 3.

  The ink jet recording head 3 is supplied from an ink discharge port 31 by the operation of a plurality of discharge means (not shown) provided inside the ink jet ink according to the present invention supplied by an ink supply means (not shown). The ink is discharged toward the recording material P. The inkjet ink according to the present invention ejected by the recording head 3 has a colorant, water, and a plurality of side chains in the hydrophilic main chain, and is crosslinked between the side chains by irradiating active energy rays. It contains a bondable polymer compound, and the ink is cured and gelled by irradiation with active energy rays.

  The inkjet recording head 3 has a certain area (can be landed) in the recording material P during the scan of moving from the one end of the recording material P to the other end of the recording material P in the Y direction in FIG. The ink of the present invention is ejected as ink droplets to the region), and the ink droplets are landed on the landable region.

  The above scanning is performed as many times as necessary, and after ejecting ink toward one landable area, the recording material is appropriately moved from the front to the back in FIG. 1 by the conveying means, and scanning by the head scanning means is performed again. However, the ink jet recording head 3 discharges ink to the next landable area adjacent to the landable area in FIG.

  By repeating the above-described operation and ejecting ink from the inkjet recording head 3 in conjunction with the head scanning means and the conveying means, an image composed of an aggregate of ink droplets is formed on the recording material P.

  FIG. 2 is a top view illustrating another example of the configuration of the main part of the ink jet recording apparatus.

  The ink jet recording apparatus shown in FIG. 2 is called a line head system, and a plurality of ink jet recording heads 3 of each color are fixedly arranged on the head carriage 2 so as to cover the entire width of the recording material P. ing.

  On the other hand, on the downstream side of the head carriage 2, the irradiation light source 8 comprising a light emitting diode having a maximum illuminance of 210 to 280 nm according to the present invention is also provided, for example, as shown in FIG. In this way, there are provided irradiation means 4 arranged so as to cover the entire area of the ink printing surface by arranging four in the scanning direction and ten in the sub-scanning direction.

  In this line head system, the head carriage 2 and the irradiating means 4 are fixed, and only the recording material P is conveyed, and ink ejection and curing are performed to form an image.

  EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited to these. In the examples, “%” represents mass% unless otherwise specified.

Example 1
As described below, polymer compounds 1 to 6 were synthesized, inks were prepared, ink sets 1 to 11 were prepared, and samples 1 to 14 shown in Table 1 were prepared using the ink sets.

<< Synthesis of Polymer Compound 1 >>
56 g of glycidyl methacrylate, 48 g of p-hydroxybenzaldehyde, 2 g of pyridine, and 1 g of N-nitroso-phenylhydroxyamine ammonium salt were each put in a reaction vessel and stirred in a hot water bath at 80 ° C. for 8 hours.

  Next, 45 g of a polyvinyl acetate saponified product having an average polymerization degree of 300 and a saponification degree of 88%, analyzed using the method defined in JIS K 6726-1994, was dispersed in 225 g of ion-exchanged water, 4.5 g of acid and p- (3-methacryloxy-2-hydroxypropyloxy) benzaldehyde obtained by the above reaction were added under the condition that the crosslinking group modification rate was 3 mol% with respect to the saponified polyvinyl acetate, and 90 Stir at 6 ° C. for 6 hours. After cooling the resulting solution to room temperature, 30 g of basic ion exchange resin was added and stirred for 1 hour. Next, the ion exchange resin was filtered, and Irgacure 2959 (manufactured by Ciba Specialty Chemicals) was mixed here as a photopolymerization initiator at a ratio of 0.5 g with respect to 100 g of 15% aqueous solution. A 12% aqueous solution of polymer compound 1 was prepared by dilution.

<< Synthesis of Polymer Compound 2 >>
A 12% aqueous solution of the polymer compound 2 was obtained in the same manner as the polymer compound 1 except that the crosslinking group modification rate of the polyvinyl acetate saponified product was changed to 0.4 mol% in the synthesis of the polymer compound 1.

<< Synthesis of Polymer Compound 3 >>
A 12% aqueous solution of the polymer compound 3 was obtained in the same manner as the polymer compound 1 except that the crosslinking group modification rate of the polyvinyl acetate saponified product was changed to 4.5 mol% in the synthesis of the polymer compound 1.

<< Synthesis of Polymer Compound 4 >>
A 12% aqueous solution of polymer compound 4 was obtained in the same manner as polymer compound 1 except that the average degree of polymerization of the polyvinyl acetate saponified product was changed to 180 in the synthesis of polymer compound 1.

<< Synthesis of Polymer Compound 5 >>
A 5% aqueous solution of polymer compound 5 was obtained in the same manner as polymer compound 1 except that the average degree of polymerization of polyvinyl acetate saponified product was changed to 4500 in the synthesis of polymer compound 1.

<< Synthesis of Polymer Compound 6 >>
After 100 g of polyacrylic acid (weight average molecular weight 800,000) was dissolved in 750 g of methanol by heating, 16 g of 4-hydroxybutyl acrylate glycidyl ether and 11 g of pyridine as a catalyst were added, and the mixture was stirred for 24 hours while maintaining at 60 ° C. After raising methanol temperature to 95 ° C. and distilling off methanol while adding water, it was treated with an ion exchange resin (Mitsubishi Chemical: PK-216H) to remove pyridine to give an aqueous solution with a nonvolatile content of 15%. Obtained. As a photopolymerization initiator, Irgacure 2959 (manufactured by Ciba Specialty Chemicals) was mixed at a rate of 0.5 g with respect to 100 g of a 15% aqueous solution, and then diluted with ion-exchanged water to obtain 10% of the polymer compound 6. Obtained.

  Next, ink was prepared (four colors of yellow, magenta, cyan, and black), and then an ink set was prepared.

<Preparation of ink>
(A) Preparation of pigment dispersion (Preparation of yellow pigment dispersion)
The following additives were mixed and dispersed using a sand grinder filled with 0.5 mm zirconia beads at a volume ratio of 50% to prepare a yellow pigment dispersion having a yellow pigment content of 10%.

C. I. Pigment Yellow 74 95g
Demall C (Kao Corporation) 65g
Ethylene glycol 100g
Ion exchange water 120g
(Preparation of magenta pigment dispersion)
The following additives were mixed and dispersed using a sand grinder filled with 50% by volume of 0.5 mm zirconia beads to prepare a magenta pigment dispersion having a magenta pigment content of 10%. The average particle size of the magenta pigment particles contained in this magenta pigment dispersion was 83 nm. The particle size was measured using a Zetasizer 1000HS manufactured by Malvern.

C. I. Pigment Red 122 10g
Jonkrill 61
(Acrylic styrene-based resin dispersant, manufactured by Johnson) 3g
Glycerin 15g
Ion exchange water 72g
(Cyan pigment dispersion)
The following additives were mixed and dispersed using a sand grinder filled with 50% by volume of 0.5 mm zirconia beads to prepare a cyan pigment dispersion having a cyan pigment content of 10%.

C. I. Pigment Blue 15: 3 100g
DEMAL C 68g
Diethylene glycol 100g
125g of ion exchange water
(Black pigment dispersion)
The following additives were mixed and dispersed using a sand grinder filled with 50% by volume of 0.5 mm zirconia beads to prepare a black pigment dispersion having a black pigment content of 10%.

Talker Black # 8500 (Tokai Carbon Co., Ltd.) 120g
Jongkrill 62 (Johnson Polymer Co., Ltd.) 59g
Lebenol WX (Kao Corporation) 3g
Diethylene glycol 100g
Ion exchange water 300g
<< Preparation of ink set (also referred to as ink composition set) 1-10 >>
The pigment type ink sets 1 to 9 and the dye type ink set 10 were produced as follows.

<< Preparation of Ink Set 1 >>: Pigment Type Ink set 1 comprising yellow ink Y1, magenta ink M1, cyan ink C1 and black ink K1 was prepared as follows.

(Preparation of yellow ink Y1)
Yellow pigment dispersion 20 parts 12% aqueous solution of polymer compound 1 17 parts Glycerol 7 parts Ethylene glycol 15 parts Diethylene glycol monobutyl ether 2 parts Olfine e1010 (manufactured by Nissin Chemical Co., Ltd.) 0.2 parts Was 100 parts, and yellow ink Y1 was prepared.

(Preparation of magenta ink M1)
Magenta ink M1 was prepared in the same manner as yellow ink Y1, except that the yellow pigment dispersion was changed to a magenta pigment dispersion in the preparation of yellow ink Y1.

(Preparation of cyan ink C1)
A cyan ink C1 was prepared in the same manner as the yellow ink Y1, except that the yellow pigment dispersion was changed to a cyan pigment dispersion in the preparation of the yellow ink Y1.

(Preparation of black ink K1)
Black pigment dispersion 20 parts 12% aqueous solution of polymer compound 1 17 parts Glycerol 7 parts Ethylene glycol 15 parts Diethylene glycol monobutyl ether 2 parts Orphine e1010 (manufactured by Nissin Chemical Co., Ltd.) 0.2 parts Was 100 parts, and black ink K1 was prepared.

<< Preparation of Ink Set 2 >>: Pigment Type Ink set 2 comprising yellow ink Y2, magenta ink M2, cyan ink C2, and black ink K2 was prepared as follows.

(Preparation of yellow ink Y2)
Yellow ink Y2 was prepared in the same manner as in the preparation of yellow ink Y1, except that a 12% by mass aqueous solution of polymer compound 2 was used instead of the 12% by mass aqueous solution of polymer compound 1.

(Preparation of magenta ink M2)
Magenta ink M2 was prepared in the same manner as in the preparation of magenta ink M1, except that a 12% by mass aqueous solution of polymer compound 2 was used instead of the 12% by mass aqueous solution of polymer compound 1.

(Preparation of cyan ink C2)
Cyan ink C2 was prepared in the same manner as in the preparation of cyan ink C1, except that a 12% by mass aqueous solution of polymer compound 2 was used instead of the 12% by mass aqueous solution of polymer compound 1.

(Preparation of black ink K2)
Black ink K2 was prepared in the same manner as in the preparation of black ink K1, except that a 12% by mass aqueous solution of polymer compound 2 was used instead of the 12% by mass aqueous solution of polymer compound 1.

<< Preparation of Ink Set 3 >>: Pigment Type Ink set 3 comprising yellow ink Y3, magenta ink M3, cyan ink C3, and black ink K3 was prepared as follows.

(Preparation of yellow ink Y3)
Yellow ink Y3 was prepared in the same manner as in the preparation of yellow ink Y1, except that a 12% by mass aqueous solution of polymer compound 3 was used instead of the 12% by mass aqueous solution of polymer compound 1.

(Preparation of magenta ink M3)
Magenta ink M3 was prepared in the same manner as in the preparation of magenta ink M1, except that a 12 mass% aqueous solution of polymer compound 3 was used instead of the 12 mass% aqueous solution of polymer compound 1.

(Preparation of cyan ink C3)
Cyan ink C3 was prepared in the same manner as in the preparation of cyan ink C1, except that a 12% by mass aqueous solution of polymer compound 3 was used instead of the 12% by mass aqueous solution of polymer compound 1.

(Preparation of black ink K3)
Black ink K3 was prepared in the same manner as in the preparation of black ink K1, except that a 12% by mass aqueous solution of polymer compound 3 was used instead of the 12% by mass aqueous solution of polymer compound 1.

<< Preparation of Ink Set 4 >>: Pigment Type Ink set 4 comprising yellow ink Y4, magenta ink M4, cyan ink C4 and black ink K4 was prepared as follows.

(Preparation of yellow ink Y4)
Yellow ink Y4 was prepared in the same manner as in the preparation of yellow ink Y1, except that a 12% by mass aqueous solution of polymer compound 4 was used instead of the 12% by mass aqueous solution of polymer compound 1.

(Preparation of magenta ink M4)
Magenta ink M4 was prepared in the same manner as in the preparation of magenta ink M1, except that a 12% by mass aqueous solution of polymer compound 4 was used instead of the 12% by mass aqueous solution of polymer compound 1.

(Preparation of cyan ink C4)
Cyan ink C4 was prepared in the same manner as in the preparation of cyan ink C1, except that a 12% by mass aqueous solution of polymer compound 4 was used instead of the 12% by mass aqueous solution of polymer compound 1.

(Preparation of black ink K4)
Black ink K4 was prepared in the same manner as in the preparation of black ink K1, except that a 12% by mass aqueous solution of polymer compound 4 was used instead of the 12% by mass aqueous solution of polymer compound 1.

<< Preparation of Ink Set 5 >>: Pigment Type Ink set 5 comprising yellow ink Y5, magenta ink M5, cyan ink C5, and black ink K5 was prepared as follows.

(Preparation of yellow ink Y5)
Yellow pigment dispersion 20 parts 5% by weight aqueous solution of polymer compound 5 40 parts Glycerol 7 parts Ethylene glycol 15 parts Diethylene glycol monobutyl ether 2 parts Olfine e1010 (manufactured by Nissin Chemical Co., Ltd.) 0.2 parts The total amount was 100 parts, and yellow ink Y5 was prepared.

(Preparation of magenta ink M5)
Magenta ink M5 was prepared in the same manner as yellow ink Y5 except that the yellow pigment dispersion was changed to a magenta pigment dispersion in the preparation of yellow ink Y5.

(Preparation of cyan ink C5)
Cyan ink C5 was prepared in the same manner as yellow ink Y5 except that the yellow pigment dispersion was changed to a cyan pigment dispersion in the preparation of yellow ink Y5.

(Preparation of black ink K5)
Black pigment dispersion 20 parts 12% by weight aqueous solution of polymer compound 5 40 parts Glycerol 7 parts Ethylene glycol 15 parts Diethylene glycol monobutyl ether 2 parts Olfine e1010 (manufactured by Nissin Chemical Co., Ltd.) 0.2 parts Black ink K5 was prepared with a total amount of 100 parts.

<< Preparation of Ink Set 6 >>: Pigment Type Ink set 6 comprising yellow ink Y6, magenta ink M6, cyan ink C6, and black ink K6 was prepared as follows.

(Preparation of yellow ink Y6)
Yellow pigment dispersion 20 parts 12% by mass aqueous solution of polymer compound 1 4.2 parts Glycerol 7 parts Ethylene glycol 15 parts Diethylene glycol monobutyl ether 2 parts Orphine e1010 (manufactured by Nissin Chemical) 0.2 parts Was added to make 100 parts in total, and yellow ink Y6 was prepared.

(Preparation of magenta ink M6)
Magenta ink M6 was prepared in the same manner as yellow ink Y6 except that the yellow pigment dispersion was changed to a magenta pigment dispersion in the preparation of yellow ink Y6.

(Preparation of cyan ink C6)
Cyan ink C6 was prepared in the same manner as yellow ink Y6 except that the yellow pigment dispersion was changed to a cyan pigment dispersion in the preparation of yellow ink Y6.

(Preparation of black ink K6)
A black ink K6 was prepared in the same manner as the yellow ink Y6 except that the yellow pigment dispersion was changed to a black pigment dispersion in the preparation of the yellow ink Y6.

<< Preparation of Ink Set 7 >>: Pigment Type Ink set 7 composed of yellow ink Y7, magenta ink M7, cyan ink C7, and black ink K7 was prepared as follows.

(Preparation of yellow ink Y7)
Yellow pigment dispersion 20 parts 12% by weight aqueous solution of polymer compound 1 43 parts Glycerol 7 parts Ethylene glycol 15 parts Diethylene glycol monobutyl ether 2 parts Olfine e1010 (manufactured by Nissin Chemical Co., Ltd.) 0.2 parts The total amount was 100 parts, and yellow ink Y7 was prepared.

(Preparation of magenta ink M7)
Magenta ink M7 was prepared in the same manner as yellow ink Y7 except that the yellow pigment dispersion was changed to a magenta pigment dispersion in the preparation of yellow ink Y7.

(Preparation of cyan ink C7)
Cyan ink C7 was prepared in the same manner as yellow ink Y7 except that the yellow pigment dispersion was changed to a cyan pigment dispersion in the preparation of yellow ink Y7.

(Preparation of black ink K7)
A black ink K7 was prepared in the same manner as the yellow ink Y7 except that the yellow pigment dispersion was changed to a black pigment dispersion in the preparation of the yellow ink Y7.

<< Preparation of Ink Set 8 >>: Pigment Type Ink set 8 composed of yellow ink Y8, magenta ink M8, cyan ink C8, and black ink K8 was prepared as follows.

(Preparation of yellow ink Y8)
Yellow pigment dispersion 20 parts 10% by mass aqueous solution of polymer compound 6 20 parts Glycerol 7 parts Ethylene glycol 15 parts Diethylene glycol monobutyl ether 2 parts Orphine e1010 (manufactured by Nissin Chemical) 0.2 parts The total amount was 100 parts, and yellow ink Y8 was prepared.

(Preparation of magenta ink M8)
Magenta ink M8 was prepared in the same manner as yellow ink Y8 except that the yellow pigment dispersion was changed to a magenta pigment dispersion in the preparation of yellow ink Y8.

(Preparation of cyan ink C8)
Cyan ink C8 was prepared in the same manner as yellow ink Y8 except that the yellow pigment dispersion was changed to a cyan pigment dispersion in the preparation of yellow ink Y8.

(Preparation of black ink K8)
A black ink K8 was prepared in the same manner as the yellow ink Y8 except that the yellow pigment dispersion was changed to a black pigment dispersion in the preparation of the yellow ink Y8.

<< Preparation of Ink Set 9 >>: Pigment Type An ink set 9 composed of yellow ink Y9, magenta ink M9, cyan ink C9 and black ink K9 was prepared as follows.

(Preparation of yellow ink Y9)
C. I. Pigment Yellow 74 10 parts Azisper PB821 (manufactured by Ajinomoto Fine Techno) 3 parts Aronix M5700 (manufactured by Toagosei Co., Ltd.) 7 parts Ethylene oxide added 1,6 hexanediol acrylate 72 parts 3-methoxybutyl acrylate 8 parts Irgacure 369 (manufactured by Ciba Specialty Chemicals) 5 parts After mixing and stirring each of the above compositions, the resulting solution was filtered with a filter to prepare an active energy ray-curable yellow ink Y9.

(Preparation of magenta ink M9)
C. I. Pigment Red122 10 parts Ajisper PB821 (manufactured by Ajinomoto Fine Techno) 3 parts Aronix M5700 (manufactured by Toagosei Co., Ltd.) 7 parts Ethylene oxide added 1,6 hexanediol acrylate 72 parts 3-methoxybutyl acrylate 8 parts Irgacure 369 (manufactured by Ciba Specialty Chemicals) 5 parts After mixing and stirring each of the above compositions, the resulting solution was filtered with a filter to prepare an active energy ray-curable magenta ink M9.

(Preparation of cyan ink C10)
C. I. Pigment Blue 15: 3 10 parts Azisper PB821 (manufactured by Ajinomoto Fine Techno) 3 parts Aronix M5700 (manufactured by Toagosei Co., Ltd.) 7 parts Ethylene oxide added 1,6 hexanediol acrylate 72 parts 3-methoxybutyl acrylate 8 parts Irgacure 369 (Ciba Specialty Chemicals) 5 parts After mixing and stirring each of the above compositions, the resulting solution was filtered with a filter to prepare an active energy ray-curable cyan ink C9.

(Preparation of black ink K10)
Carbon black (manufactured by Mitsubishi Chemical Corporation, MA-7) 10 parts Azisper PB821 (manufactured by Ajinomoto Fine Techno) 3 parts Aronix M5700 (manufactured by Toagosei Co., Ltd.) 7 parts Ethylene oxide-added 1,6-hexanediol acrylate 72 parts 3-methoxybutyl acrylate 8 Part Irgacure 369 (manufactured by Ciba Specialty Chemicals) 5 parts After mixing and stirring each of the above compositions, the resulting solution was filtered through a filter to prepare an active energy ray-curable black ink K9.

  Hereinafter, a dye-type ink set 10 was prepared.

<< Preparation of Ink Set 10 >> Dye Type An ink set 10 comprising yellow ink Y10, magenta ink M10, cyan ink C10, and black ink K10 was prepared as follows.

(Preparation of yellow ink Y10)
C. I. Acid Yellow 23 3 parts 12% by weight aqueous solution of polymer compound 1 17 parts Glycerol 7 parts Ethylene glycol 15 parts Diethylene glycol monobutyl ether 2 parts Olphine e1010 (manufactured by Nissin Chemical Co., Ltd.) 0.2 parts 100 parts of yellow ink Y10 was prepared.

(Preparation of magenta ink M10)
In the preparation of the yellow ink Y10, C.I. I. Acid Yellow 23 is C.I. I. A magenta ink M10 was prepared in the same manner as the yellow ink Y10 except that it was changed to Direct Red 227.

(Preparation of cyan ink C10)
In the preparation of yellow ink Y11, C.I. I. Acid Yellow 23 is C.I. I. A cyan ink C10 was prepared in the same manner as the yellow ink Y10 except that it was changed to Direct Blue 199.

(Preparation of black ink K10)
C. I. Food Black 2 4 parts 12% by weight aqueous solution of polymer compound 1 17 parts Glycerol 7 parts Ethylene glycol 15 parts Diethylene glycol monobutyl ether 2 parts Olphine e1010 (manufactured by Nissin Chemical Co., Ltd.) 0.2 parts 100 parts of black ink K10 was prepared.

<Inkjet recording method>
Image printing was performed by an ink jet recording apparatus having a function shown in FIG. 1 using a piezo ink jet nozzle. The ink supply system includes an ink tank, a supply pipe, a front chamber ink tank immediately before the head, a pipe with a filter, and a piezo head. The piezo head was driven and ejected so that 2 to 15 pl multi-size dots could be ejected at a resolution of 720 × 720 dpi (dpi represents 1 inch, that is, the number of dots per 2.54 cm). After each ink landed, the ink was cured by irradiating with ultraviolet rays from each irradiation light source shown in Table 1 instantly (less than 1 second after landing) by the lamp units on both sides of the carriage. In addition, the detail of each irradiation light source of Table 1 is as follows.

(1) LED: Special order product manufactured by Kobe Steel Co., Ltd. A plurality of light emitting diodes having a maximum illuminance at 246 nm are arranged. Light source power consumption is less than 1 kW · hr; Irradiation light source according to the present invention (2) Low-pressure mercury lamp: Harrison Toshiba Lighting Company 3) High-pressure mercury lamp: manufactured by Nippon Battery Co., Ltd. HN-64NL, a filter that transmits only a wavelength of 254 nm, a filter that transmits only a wavelength of 365 nm is used. The illuminance of each irradiation light source shown in Table 1 is Ushio The integrated illuminance of 220 nm to 420 nm was measured and displayed by URS40 manufactured by the manufacturer.

<Evaluation of inkjet recording image>
Each image recorded by the above image forming method was subjected to the following evaluations.

《Color bleed: Evaluation of bleed resistance》
After printing a black thin line having a width of 200 μm on a magenta solid on art paper (Oji Paper's OK Kanto +) by the above-described ink jet recording method, the color bleed (bleed resistance) was ranked according to the following criteria and visually observed.

◎: The boundary between the fine line and the solid is clear. ○: The boundary is slightly blurred, but there is no problem in practical use. △: The boundary is blurred, but practically acceptable. X: Obvious blurring is observed at the boundary, the line width is about 1.5 times, and this is a quality that is a practical problem. XX: The boundary between the fine line and the solid part is unclear. Quality and extremely low bleed resistance <Evaluation of beading resistance>
A 5 cm × 5 cm magenta solid was printed and visually observed on art paper (Oji Paper OK Kanofuji +) by the above-described ink jet recording method, and the beading resistance was ranked according to the following criteria.

◎: Uniform image ○: Mottled noise that can be seen when viewed closely is present in less than 5 points Δ: Mottled noise that can be understood when viewed carefully is present in less than 10 points ×: Clear mottled noise is 10 Existence of more than one place XX: There are more than 20 mottled noises. Among these, XX and XX are levels at which there is a problem as a product.

<Evaluation of image smoothness>
N3 “fruit basket” of high-definition color digital standard image conforming to JIS X 9201-1995 is printed on art paper (Oji Paper's OK Kanfuji +) by the above printing method, visually observed, and image smoothness is observed according to the following criteria. Rank evaluation.

A: There is almost no difference in smoothness between the recording surface and the background, and it is natural. ○: The smoothness of the recording surface and the background is slightly different, but an acceptable level. No ×: The surface of the recording surface is observed to be rough, and there is clearly no smoothness. XX: A large roughness is felt not only by visual inspection but also by palpation. << Evaluation of unevenness in image density >>
90 cm gray of 10 cm × 10 cm was printed on art paper (Oji Paper's OK Kanfuji +) by the above printing method, visually observed, and image density unevenness (also referred to as density unevenness) was evaluated according to the following criteria.

○: Natural with almost no density unevenness Δ: Some density unevenness is felt ×: Density unevenness is clearly felt << Evaluation of gloss unevenness >>
90% gray of 10 cm × 10 cm was printed on art paper (Oji Paper's OK Kanto +) by the above printing method, visually observed, and the gloss unevenness was evaluated according to the following criteria.

○: There is almost no gloss unevenness and △: Gloss unevenness is felt a little. ×: Gloss unevenness is felt clearly. Note that the above art paper (Oji Paper's OK Kanto +) is a recording medium with low ink absorption. is there. The obtained results are shown in Table 2.

  From Table 2, compared with the comparison, the sample of the present invention does not cause beading or color bleeding on a medium having no ink absorbability, and an image with high image quality is obtained. Is clearly improved.

It is a front view which shows an example of a structure of the principal part of the inkjet recording device which concerns on this invention. It is a top view which shows another example of a structure of the principal part of the inkjet recording device which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inkjet recording device 2 Head carriage 3 Inkjet recording head 31 Ink discharge port 4 Irradiation means 5 Platen part 6 Guide member 7 Bellows structure 8 Irradiation light source P Recording material

Claims (11)

After landing an ink-jet ink containing at least a colorant, water, and a polymer compound having a plurality of side chains in a hydrophilic main chain and capable of forming a cross-linked bond between the side chains on a recording material, In the inkjet recording method in which the cross-linking is formed by irradiating active energy rays,
An inkjet recording method, wherein the inkjet ink is cured by the active energy ray emitted from a light source having a maximum illuminance in a range of 210 nm to 280 nm. 2. The ink jet recording method according to claim 1, wherein the light source is a lamp in which a plurality of light emitting diodes are arranged. 3. The ink jet recording method according to claim 1, wherein the active energy ray is irradiated between 0.001 second and 1.0 second after the ink jet ink has landed on the recording material. 4. The ink jet recording method according to claim 2, wherein the light emitting diode uses a diamond thin film as a light emitting element. 5. The inkjet recording apparatus according to claim 1, wherein the inkjet recording apparatus includes a carriage that houses an inkjet recording head, and is provided with lamps in which a plurality of ultraviolet LEDs are arranged at both ends of the carriage. The inkjet recording method as described. An inkjet recording apparatus having inkjet recording heads A and B that respectively eject at least two colors of inks A and B, and having a lamp in which a plurality of ultraviolet LEDs are arranged in the vicinity of the inkjet recording heads A and B is used. The inkjet recording method according to claim 1, wherein: 5. The ink jet recording apparatus according to claim 1, wherein the ink jet recording head is of a line head type, and an ink jet recording apparatus provided with a lamp in which a plurality of ultraviolet LEDs are arranged downstream of the ink jet recording head is used. The ink jet recording method described in 1. The ink jet according to any one of claims 1 to 7, wherein the polymer compound is contained in an amount of 0.8% by mass to 5.0% by mass with respect to the total mass of the ink jet ink. Recording method. The hydrophilic main chain is a saponified product of polyvinyl acetate, and the saponified product has a saponification degree of 77 mol% to 99 mol% and an average polymerization degree of 200 as defined in JIS K 6726-1994, respectively. The inkjet recording method according to any one of claims 1 to 8, wherein the inkjet recording method is. The inkjet recording method according to any one of claims 1 to 9, wherein a modification rate of the side chain with respect to the hydrophilic main chain is 0.8 mol% to 4 mol%. The inkjet recording method according to claim 1, wherein the inkjet ink contains a water-soluble photopolymerization initiator.

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