JP2003039645A - Ink jet recording method and ink jet recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet recording method and a recorder exhibiting good weatherability, water resistance and abrasion resistance. SOLUTION: The ink jet recording method comprises a first step for printing a recording medium by ink jet recording system with ink containing a liquid composition dissolving or dispersed with a water soluble dye, a water insoluble dye or a pigment as a coloring material, a second step for imparting a recording image formed on the recording medium with microcapsules employing a substance having a function for protecting the image as a shell part and a substance having mold releasing properties as a core part, and a third step exhibiting the function for protecting the recording image and mold releasing properties.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inkjet recording method and an inkjet recording apparatus capable of forming an image having good weather resistance, water resistance and scratch resistance on a recording medium.

[0002]

2. Description of the Related Art The ink jet recording method has advantages that noise during recording is small and that a high resolution image can be obtained at high speed by using a highly integrated head. In such an ink jet recording system, as ink,
Various water-soluble dyes dissolved in a mixed solution of water and an organic solvent are widely used. JP-A-10-251578
As disclosed in Japanese Patent Publication No. JP-A-2003-264, there is provided an ink having a high print density and containing no clogging of a print head by containing a specific nonionic surfactant in the ink containing at least a dye. . However, since the dye remains on the surface of the recording medium to have a high printing density, there is a problem that the scratch resistance and water resistance of the image are poor.

Further, since these water-soluble dyes are inferior in weather resistance to pigments, in recent years, water-based pigment inks in which pigment particles are finely dispersed using a water-soluble polymer resin, and surface modification of pigments are carried out to make fine pigments. Products using the dispersed ink for ink jet recording have come to be widely used. JP-A-1
As disclosed in Japanese Patent Laid-Open No. 1-323232, the coloring property, the dispersion stability, and the ejection stability are defined by the regulation of the pigment concentration, the surface tension, the volume cumulative particle diameter of the self-dispersion pigment ink and the regulation of the Beck smoothness of the recording medium. A recording method with good stability is provided. Further, as disclosed in JP-A-10-60352, a pigment ink having good fixability on a film-type recording medium is provided according to the definition of a polymer dispersant in the pigment ink.

However, since the high print density is obtained by leaving the pigment in the vicinity of the surface of the recording medium, the surface condition of the recording medium has a great influence on the print density of the printed matter. Particularly in glossy and film-based recording media, the problems of poor rubbing resistance such as rubbing with fingers and weak water resistance are remarkable, and the problems of weather resistance, water resistance, and rubbing resistance in the method of the above publication are significant. Has not been fully resolved.
In particular, when used as an industrial label such as a physical distribution label or a product label, the use environment is harsh, so it is essential to solve the above-mentioned problems.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art. The object of the present invention is to provide an ink jet recording method and ink jet recording having good weather resistance, water resistance and scratch resistance. A device is provided.

[0006]

The above object can be achieved by the present invention described below. That is, the present invention comprises a first step of printing an ink containing a liquid composition in which a water-soluble dye, a water-insoluble dye or a pigment is dissolved or dispersed as a coloring material on a recording medium by an inkjet recording method, and the recording target. A second step of providing a recorded image formed on the medium with microcapsules having a substance having a function of protecting the image as a shell part and a substance having releasability as a core part, and the recorded image. Provided is an inkjet recording method, which comprises a third step of exhibiting a protective function and releasability.

The present invention also provides a water-soluble dye as a coloring material,
Means for printing an ink containing a liquid composition in which a water-insoluble dye or pigment is dissolved or dispersed on a recording medium by an inkjet recording method, and a function of protecting the recorded image formed on the recording medium, Characterized in that it comprises a means for providing a microcapsule having a substance having a shell as a shell part and a substance having a releasability as a core part, and a function for protecting the recorded image and exhibiting releasability. An inkjet recording device is provided.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the following preferred embodiments. As shown in FIG. 2, when the recording image 12 is printed on the recording medium 11 by the conventional inkjet recording method, the recording image 12 is disturbed by rubbing the recording image 12 with a finger or contacting with water. . This is because the coloring material remains near the surface of the recording medium 11. This phenomenon appears even when a dye is used as the coloring material, but it becomes particularly remarkable when a pigment is used as the coloring material.

Therefore, in the present invention, as shown in FIG. 3, a microcapsule 13 having a substance having a function of protecting the recorded image 12 as a shell part and a substance having releasability as a core part is formed on the recorded image 12. After being applied by any means such as roll coating, spraying or an inkjet recording method, the function of the microcapsules 13 is exhibited and fixed as shown in FIG. In addition,
After printing, the recording image (ink) 12 on the recording medium 11 may be dried, the ink may be cured by irradiation with an electron beam or ultraviolet rays, or the ink may be dried at the same time in the step of exhibiting the function of the microcapsule 13. May be.

The function of the microcapsule 13 is protected by overcoating the recorded image 12 by destroying the shell portion of the microcapsule by heat or pressure, or both heat and pressure. Further, when the microcapsules 13 are broken by using a roller, a soft solid substance having releasability is used for the core portion in order to eliminate conveyance failure due to sticking of the roller.

When a dye is used as the coloring material, the recorded image 12 is not directly exposed to the outside air or outside light by the overcoat 14, so that the weather resistance, water resistance and scratch resistance of the recorded image 12 are improved. .

Next, the recording method of the present invention will be described with reference to FIG. The recording medium 5 used in the present invention is conveyed to the inkjet recording head 1 for recording an image. The inkjet recording head 1 is an on-demand type that uses a charge amount control type, a continuous type that uses a spray method, a bubble jet (registered trademark) method that uses thermal energy, or a piezo method that uses a piezo diaphragm. May be

The ink used in the present invention is composed of a coloring material, a water-soluble organic solvent, and water, but a surfactant or the like may be added to obtain ink jet suitability. As the coloring material used in the ink, both dyes and pigments can be used, but it is preferable to use the pigments from the viewpoint of stability against ultraviolet irradiation and reliability of the printed matter. When using a dye, it is preferable to use a metal-containing dye having strong light resistance. The amount of the coloring material contained in the ink used in the present invention is 1 to 20% by weight, preferably 2 to 12%.

The coloring material used in the ink of the present invention may be known ones, for example, direct dyes, acid dyes, basic dyes, reactive dyes, water-soluble dyes such as food dyes, water such as pigments and disperse dyes. Insoluble dyes may be mentioned. For example, among the water-soluble dyes, direct dyes include C.I. I. Direct Black-17, 19, 22, 32, 38, 51, 62, 7
1, 108, 146, 154, 168, C.I. I. Direct Yellow-12, 24, 26, 44, 86, 87,
98, 100, 130, 142, C.I. I. Direct Red-1, 4, 13, 17, 23, 28, 31, 62,
79, 81, 83, 89, 227, 240, 242, 2
43, C.I. I. Direct Blue-6,22,25,7
1, 78, 86, 90, 106, 199, C.I. I. Direct Orange-34, 39, 44, 46, 60, C.I.
I. Direct Violet-47, 48, C.I. I. Direct Brown-109, C.I. I. Direct Green-59 and the like can be mentioned.

Acid dyes include C.I. I. Acid Black-2, 7, 24, 26, 31, 52, 63, 11
2, 118, 168, 172, 208, C.I. I. Acid Yellow-11, 17, 23, 25, 29, 42, 4
9, 61, 71, C.I. I. Acid Red-1, 6,
8, 32, 37, 51, 52, 80, 85, 87, 9
2, 94, 115, 180, 254, 256, 289,
315, 317, C.I. I. Acid Blue-9,22,
40, 59, 93, 102, 104, 113, 117,
120, 167, 229, 234, 254, C.I. I. Acid Orange-7, 19, C.I. I. Acid Violet-49 and the like.

As the reactive dye, C.I. I. Reactive Black-1, 5, 8, 13, 14, 23, 31, 3
4, 39, C.I. I. Reactive Yellow-2, 3, 1
3, 15, 17, 18, 23, 24, 37, 42, 5
7, 58, 64, 75, 76, 77, 79, 81, 8
4, 85, 87, 88, 91, 92, 93, 95, 10
2, 111, 115, 116, 130, 131, 13
2, 133, 135, 137, 139, 140, 14
2,143,144,145,146,147,14
8, 151, 162, 163, C.I. I. Reactive Red-3, 13, 16, 21, 22, 23, 24, 2
9, 31, 33, 35, 45, 49, 55, 63, 8
5, 106, 109, 111, 112, 113, 11
4, 118, 126, 128, 130, 131, 14
1, 151, 170, 171, 174, 176, 17
7, 183, 184, 186, 187, 188, 19
0, 193, 194, 195, 196, 200, 20
1, 202, 204, 206, 218, 221, C.I.
I. Reactive Blue-2, 3, 5, 8, 10, 1
3, 14, 15, 18, 19, 21, 25, 27, 2
8, 38, 39, 40, 41, 49, 52, 63, 7
1, 72, 74, 75, 77, 78, 79, 89, 10
0, 101, 104, 105, 119, 122, 14
7, 153, 158, 160, 162, 166, 16
9, 170, 171, 172, 173, 174, 17
6, 179, 184, 190, 191, 194, 19
5, 198, 204, 211, 216, 217, C.I.
I. Reactive Orange-5, 7, 11, 12, 1
3, 15, 16, 35, 45, 46, 56, 62, 7
0, 72, 74, 82, 84, 87, 91, 92, 9
3, 95, 97, 99, C.I. I. Reactive violet-1, 4, 5, 6, 22, 24, 33, 36, 3
8, C.I. I. Reactive Green-5, 8, 12, 1
5, 19, 23, C.I. I. Reactive Brown-2,
7, 8, 9, 11, 16, 17, 18, 21, 24, 2
6, 31, 32, 33 and the like.

Examples of the basic dye include C.I. I. Basic Black-2, C.I. I. Basic Red-1, 2,
9, 12, 13, 14, 27, C.I. I. Basic Blue-1, 3, 5, 7, 9, 24, 25, 26, 28, 2
9, C.I. I. Basic Violet-7, 14, 2
7, C.I. I. Food Black-1, 2 etc. are mentioned. These examples of the above-mentioned coloring materials are particularly preferable for the ink used in the present invention, but the coloring materials used in the ink used in the present invention are not particularly limited to the above-mentioned coloring materials.

Pigments may also be used in the present invention. When a pigment is used, a particularly large effect can be obtained. The carbon black used for black ink is a furnace method, a channel method, or high specific surface area carbon produced by activating petroleum coke with a large amount of alkali, and carbon black materials such as those mentioned above. Fluorine treatment from the phase, plasma treatment of hydrophilic polymerizable monomers,
It may be carbon black which has been subjected to a treatment such as graft polymerization of a hydrophilic monomer from a liquid phase. The above carbon black has a primary particle size of 15 to 40.
mμm, specific surface area by BET method is 50 to 3,000 m
² / g, DBP oil absorption is 40 to 150 ml / 100 g,
It has a volatile content of 0.5 to 10% and a pH value of 2 to 9.

Those carbon black pigments (CIPigm
No. for ent Black 7). 2300, No. 90
0, MCF-88, No. 33, No. 40, No. Four
5, No. 52, MA7, MA8, MA100, No. 52.
2200B (above Mitsubishi Chemical); Raven 700, Raven
5750, Raven 5250, Raven 5000, Raven 3
500, Raven 1255 (Made in Colombia); Regal
400R, Regal 330R, Regal 660R, Mogul
L, Monarch 700, Monarch 800, Monarch 880,
Monarch 900, Monarch 1000, Monarch 110
0, Monarch 1300, Monarch 1400 (made by Cabot); ColorBlack FW1, ColorBlackFW2, ColorBl
ack FW2V, ColorBlack FW18, ColorBlack FW20
0, ColorBlack S150, ColorBlack S160, ColorB
lack S170, Printex 35, Printex U, Printex V,
Printex 140U, Printex140V, Special Black
6, Special Black 5, Special Black 4A, Special
Black 4, (made by Degussa); MaxSorb G-
40, Max Sorb G-15, Max Sorb G
-08 (all manufactured by Kansai Thermochemical Co., Ltd.) and the like can be used.

Pigment Yellow-1, 2, 3, 12, 13, 14, 16, 17, 5 is a yellow pigment.
5, 73, 74, 75, 83, 93, 95, 97, 9
8, 109, 110, 114, 128, 138, 13
9, 150, 151, 154, 180 and the like,
As magenta pigments, Pigment Red 5, 7, 1
2, 48 (Ca), 48 (Mn), 57: 1, 57 (Sr),
57: 2, 122, 123, 168, 184, 202,
238 and the like, and cyan pigments include Pigment Blue 1, 2, 3, 16, 22, 60, 15: 2, 1
5: 3, Pat Blue 1, 60 and the like.

Such a pigment is dispersed in a water-soluble polymer resin for use in the ink. The water-soluble polymer resin is
An alkali-soluble water-soluble resin is preferable, and a weight average molecular weight thereof is 1,000 to 30,000, and preferably 3,
It is in the range of 000 to 15,000. When the resin having a weight average molecular weight of more than 30,000 is used, the viscosity of the dispersion becomes large.
Ink ejection characteristics are inferior. Further, the weight average molecular weight is 1,
If it is less than 000, a sufficient dispersion effect due to steric hindrance cannot be obtained, and the dispersion stability of the ink is poor.

Specifically, styrene, a styrene derivative,
Hydrophobic monomers such as vinylnaphthalene, vinylnaphthalene derivatives, alkyl esters of acrylic acid and alkyl esters of methacrylic acid, and α, β-ethylenically unsaturated carboxylic acids and their aliphatic alcohol esters, acrylic acid, methacrylic acid, maleic acid , A copolymer of hydrophilic monomers such as itaconic acid, fumaric acid, and their derivatives, and salts thereof. The copolymer may have any structure such as random, block or graft, and has an acid value of 80 to 430, preferably 1
The range is from 00 to 300.

As the water-soluble polymer resin used in the present invention, water-soluble polymers such as polyvinyl alcohol and carboxymethyl cellulose, water-soluble resins such as naphthalene sulfonic acid formaldehyde condensate and polystyrene sulfonic acid can also be used. Is. The amount of these water-soluble polymer-dispersed resins used is in the range of pigment weight: dispersant weight = 10: 6 to 10: 0.5.

As the basic substance for solubilizing the above alkali-soluble resin in water, monoethanolamine, diethanolamine, triethanolamine, ethylmonoethanolamine, ethyldiethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine. It is possible to use organic amines such as alkanolamines and ammonia, and inorganic bases such as potassium hydroxide and sodium hydroxide. The ink of the present invention is mainly composed of water, and a water-soluble solvent is mixed and used if necessary. It is preferable that the total amount of the water-soluble solvent is about 30% by weight or less based on the whole ink. In preparing the ink, the selection of the solvent system is important for controlling the storage stability and the moisturizing property at the nozzle tip.

As the water-soluble organic solvent usable in the present invention, ethylene glycol, diethylene glycol, triethylene glycol, tripropylene glycol, 1,
2-butanediol, 1,3-butanediol, 1,4
-Butanediol, dimethylsulfoxide, diacetone alcohol, glycerin monoallyl ether, propylene glycol, butylene glycol, polyethylene glycol 300, thiodiglycol, N-methyl-2-pyrrolidone, 2-pyrrolidone, γ-butyrolactone, 1,
3-dimethyl-2-imidazolidinone, sulfolane,
Trimethylolpropane, trimethylolethane, neopentyl glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monoallyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, triethylene glycol monomethyl ether,
Triethylene glycol monoethyl ether, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, β-dihydroxyethyl urea, urea, acetonylacetone, pentaerythritol, 1,4-cyclohexanediol, hexylene glycol, ethylene glycol monopropyl ether, Ethylene glycol monobutyl ether, ethylene glycol monoisobutyl ether, ethylene glycol monophenyl ether, diethylene glycol diethyl ether, diethylene glycol monobutyl ether, diethylene glycol monoisobutyl ether, triethylene glycol monobutyl ether, triethylene glycol dimethyl ether, triethylene glycol diethyl ether, tet Ethylene glycol dimethyl ether, tetraethylene glycol diethyl ether, propylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monobutyl ether, tripropylene glycol monomethyl ether, glycerin monoacetate, glycerin diacetate, glycerin triacetate , Ethylene glycol monomethyl ether acetate, diethylene glycol monomethyl ether acetate, cyclohexanol, 1,2-cyclohexanediol, 1-butanol, 3-methyl-1,5-pentanediol, 3-hexene-2,5-diol, 2,3 -Butanediol,
1,5-pentanediol, 2,4-pentanediol, 2,5-hexanediol, ethanol, n-propanol, 2-propanol, 1-methoxy-2-propanol, furfuryl alcohol, tetrahydrofurfuryl alcohol and the like. .

In the present invention, an ultraviolet-curable resin and a photoinitiator are contained in the ink, and the ink is cured immediately after printing by irradiation with ultraviolet rays to record on a non-absorptive recording medium such as plastic or metal. Is possible. In the present invention, the water-soluble UV-curable resin contained in the ink when irradiated with UV rays immediately after printing has a molecular weight of 5
From the viewpoint of coating film performance, it is preferable to contain an oligomer having a range of about 00 to 10,000 and a photopolymerizable monomer,
Either one may be used. As the oligomer, a monofunctional or polyfunctional polymerizable compound can be used. Among them, those having two or more (meth) acryloyl groups in one molecule are preferable, and they are polymerized with a monomer or the like by ultraviolet irradiation to form a coating film. In particular, the compound group consisting of polyol acrylate, epoxy acrylate, piperazine ethyl acrylate and diacryloyl ethyl piperazine is suitable in terms of water solubility, UV curing rate and coating film physical properties.

As the monomer, those having an acrylate structure of low molecular weight polyol are preferable. Specifically, diethylene glycol diacrylate, neopentyl glycol diacrylate, 1,6-hexanediol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, acryloylmorpholine, 2-phenoxyethyl acrylate, dipentaerythritol polyacrylate. Acrylate and dipentaerythritol polyacrylate are preferred. When the coating liquid is applied to the recording medium by the inkjet recording method, the addition amount of such a photopolymerizable compound is preferably 5 to 50% by weight from the viewpoint of coating film characteristics and ejection characteristics.

The photopolymerization initiator used in the present invention is 184
The polymerization initiator used in the reaction solution of the present invention is benzoin methyl ether or benzoin ethyl ether, which absorbs ultraviolet rays in the region of about nm to 450 nm to generate radicals or ions to start the polymerization of oligomers and monomers. , Isopropyl benzoin ether, isobutyl benzoin ether, 1-phenyl-1,2-propanedione-2- (o-ethoxycarbonyl) oxime, benzyl, diethoxyacetophenone, benzophenone, chlorothioxanthone, 2-chlorothioxanthone, isopropylthioxanthone, 2 -Methylthioxanthone, polychlorinated polyphenyl, hexachlorobenzene and the like are preferable, and isobutyl benzoin ether and 1-phenyl-1,2-propanedione-2- are preferable.
(O-ethoxycarbonyl) oxime. Also, Vi
cure 10, 30 (Stauffer Chemical), Irgacure
184, 651, 2959, 907, 369, 170
0, 1800, 1850, 819 (Ciba Specialty Chemicals), Darocure 1173 (EM Chemical), QuantacureCTX, ITX (Aceto Chemical), Lucirin TPO (BASF) Can also be used. The content of the photopolymerization initiator in the ink may be 0.1 to 10% by weight, preferably 0.3 to 3% by weight.

In addition to the above-mentioned materials, the ink of the present invention may contain a surfactant, a preservative, an antioxidant, and other auxiliary materials for controlling physical properties. As the surface active agent, nonionic surface active agents, amphoteric surface active agents, cationic surface active agents and the like can be used. These surfactants have various purposes of addition, for example, as an auxiliary agent for improving the permeability of the recording medium, the wettability with the ejection device member, the flow characteristics and the dispersion stability.

The ink used in the present invention is preferably used after the coloring material is washed and purified to remove impurities. This ink is mixed with constituents that are compatible with the inkjet recording system used, filtered,
The ink is removed by removing impurities by centrifugation.

After printing with the ink jet recording system,
If the water contained in the ink on the recording medium remains, bubbles may be generated due to evaporation of the water during microcapsule fixing, and thus a drying step may be included. As the drying mechanism unit used in the present invention, it is possible to use one having a known dryer mechanism, a hot air drying device, a heat drum, and the like.

As the method of microencapsulation used in the present invention, the wall forming material is separately present in both the organic phase and the aqueous phase, and a polymerization reaction is caused at the interface between the organic phase and the aqueous phase to form the microcapsules. The interfacial polymerization method for forming, the so-called In-Situ polymerization method for forming microcapsules by dissolving or existing the material forming the wall only in the organic phase, the pH of the polymer aqueous solution, by changing the concentration and the like of the polymer A coacervation method in which the dense phase is phase-separated to form microcapsules can be mentioned.

Examples of shell forming materials include terephthaloyl chloride, toluene diisocyanate, bisphenol A, ethylenediamine, ethylene glycol, styrene, divinylbenzene, gelatin, gum arabic,
Carboxymethyl cellulose etc. are mentioned. Also,
As the core material used in the present invention, any soft solid substance exhibiting a preferable mold release property can be used. Such substances include waxes (beeswax, carnauba wax, microcrystalline wax, etc.), higher fatty acids (stearic acid, palmitic acid, lauric acid, etc.), higher fatty acid metal salts (aluminum stearate, lead stearate,
Barium stearate, magnesium stearate, zinc stearate, zinc palmitate, etc., higher fatty acid derivatives (methyl hydroxystearate, glycerol monohydroxystearate, etc.), polyolefins (low molecular weight polyethylene, low molecular weight polypropylene, polyethylene oxide, polyisobutylene) , Polytetrafluoroethylene, etc.), olefin copolymer (ethylene-acrylic acid copolymer, ethylene-acrylic acid ester copolymer, ethylene-methacrylic acid copolymer, ethylene-methacrylic acid ester copolymer, ethylene- Vinyl chloride copolymer,
Ethylene-vinyl acetate copolymer, ionomer resin, etc., styrene resin (low molecular weight polystyrene, styrene-butadiene copolymer (monomer weight ratio 5 to 30: 9)
5-70), styrene-acrylic compound copolymer, etc.), epoxy resin, polyester resin (acid value 10 or less), rubbers (isobutylene rubber, nitrile rubber, chlorinated rubber, etc.), polyvinylpyrrolidone, polyamide, coumarone-indene There are resins, methyl vinyl ether-maleic anhydride copolymers, maleic acid-modified phenol resins, phenol-modified terpene resins, silicone resins and the like, and these can be used alone or in combination.

The particle size of the microcapsules obtained as described above, particularly when applied by an ink jet recording method, is from the viewpoint of storage stability of the applied liquid and clogging of nozzles.
The average particle size is preferably 10 μm or less.

To make the final application liquid using the microcapsules thus formed, the capsules are once taken out by centrifugation or filtration and added to the solvent of the application liquid already prepared, or if necessary. It is also possible to add an organic solvent, a pH adjuster, a surfactant, an antiseptic agent or the like to prepare the application liquid, or to add the additives as described above to the application liquid without removing the microcapsules from water. There is no particular limitation on the method of applying the liquid. Also,
Roll coating, spraying, or an inkjet recording method is used as a means for applying. The applying liquid is adjusted to an optimum physical property value by those means before use.

As the fixing mechanism used in the present invention, a known pressurizing and heating type fixing machine can be used, and a newly manufactured one for the present invention can also be used.

The method of the present invention will be described with reference to the drawings.
In FIG. 1, a recording image is formed on the recording medium 5 from the inkjet recording head 1 while moving in the direction of the arrow, and then the heating device section 2 evaporates the moisture in the ink. Then, a liquid containing microcapsules is applied from the microcapsule applying head 3, and the pressurizing device section 4 ruptures and fixes the microcapsule shell section by applying pressure. In the figure, reference numeral 6 is an inkjet recording device unit, 7 is a heating device unit, 8 is a microcapsule coating device unit, 9 is a spur for conveyance, and 10 is a conveyance belt.

[0038]

The present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited to these examples. In the text, “%” or “part” is based on weight unless otherwise specified.

<Example 1> An ink having the following composition was prepared,
The ink of Example 1 was used.

[0040]

[0041]

[0042] An image was formed on the glossy paper (made by QP Konica) using the above ink using an inkjet recording device.

(Preparation of Microcapsules) A styrene-acrylic acid copolymer was used as a shell material, and carnauba wax was used as a core material by a suspension polymerization method.

[Drying Step] The recording medium on which the image was formed, which was sent by the conveying section, was made to evaporate the water content in the ink on the recording medium by a heating device (temperature 120 ° C.).

[Microcapsule Applying Step] The recording medium that has been sent by the transport unit and has formed an image to evaporate the water content in the ink is applied with the microcapsules by an inkjet recording method on the recording medium by the microcapsule applying device. did.

[Pressurizing Step] The recording medium to which the image is formed, the moisture in the ink is evaporated, and the microcapsules are provided is sent from the conveying section, and the microcapsules are destroyed by the pressing device. Fixed in.

Example 2 An ink having the following composition was prepared,
The ink of Example 2 was used.

[0048]

[0049]

[0050] After mixing the above components and stirring for 2 hours, impurities were removed by pressure filtration to obtain an ink.

(Preparation of Microcapsules) A styrene-acrylic acid copolymer was used as a shell material, and carnauba wax was used as a core material by a suspension polymerization method.

An image was formed from the above ink on a PET film (manufactured by Toray) using an inkjet recording device.

[Ultraviolet Curing Step] In the recording medium on which the image is formed, which is sent by the transport unit, the ink on the recording medium is cured by the ultraviolet irradiation device.

[Microcapsule Applying Step] The recording medium on which the image is formed and the ink is cured, which is sent by the conveying section, is applied with microcapsules on the recording medium by an inkjet recording method by a roll coat type microcapsule applying device. did.

[Pressure Step] The recording medium on which the image was formed and the ink was cured, which was sent from the transporting unit, was broken into microcapsules by the pressure device and fixed on the recording medium.

<Comparative Example 1> Comparative Example 1 was prepared by forming an image on a recording medium using the ink of Example 1 and then performing only the drying step.

Comparative Example 2 Comparative Example 2 was prepared by using the ink of Example 2 to print on a PET film as a recording medium and then passing only the ultraviolet curing step.

[Evaluation Method] (Weather Resistance) The recorded matter was subjected to an accelerated ozone resistance test for up to 2 hours using an ozone weatherometer (manufactured by Suga Test Instruments), and OD values before and after the weather resistance test were measured. The residual OD rate was calculated by the calculation method.

Residual OD ratio (%) = OD value after accelerated test /
OD value before acceleration test × 100 Then, evaluation was made according to the following evaluation criteria. ⊚: Residual OD rate of 90% or more. ◯: Residual OD ratio of 70% or more. Δ: Residual OD rate of 50% or more. X: Residual OD ratio of 50% or less.

(Water resistance) The recorded matter was immersed in tap water for 5 minutes and visually evaluated according to the following evaluation criteria. A: No bleeding is observed. ◯: Slight bleeding but not noticeable. Δ: Characters can be recognized although there is bleeding. X: There is bleeding and characters cannot be recognized.

(Scratchability of Printed Image) The printed image is attached to glass and rubbed with SUS tweezers. And it evaluated visually by the following evaluation criteria. ⊚: Distorted printed image is not observed. ◯: Characters can be recognized although the printed image is slightly disturbed. ×: The printed image is distorted and the characters cannot be recognized.

[0062]

[0063]

As described above, according to the ink jet recording method and recording apparatus of the present invention, it is possible to provide an ink jet recorded image having excellent weather resistance, water resistance and scratch resistance.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a recording method of the present invention.

FIG. 2 is a diagram showing a printing state by a conventional inkjet recording method.

FIG. 3 is a diagram illustrating a recorded matter of the invention (after applying microcapsules).

FIG. 4 is a diagram illustrating a recorded matter of the invention (after fixing microcapsules).

[Explanation of symbols]

1: Inkjet recording head 2: Heating device section 3: Microcapsule coating head 4: Pressurizing device section 5: Recording medium 6: Inkjet recording device section 7: Heating unit 8: Microcapsule coating device section 9: Transport spur 10: Conveyor belt 11: Recording medium 12: Recorded image 13: Microcapsule 14: Fixed microcapsules

Continued front page    F-term (reference) 2C056 EA13 HA45 HA46 HA60                 2C061 AQ05 AR01 CK02                 2H086 BA02 BA55 BA56

Claims (13)

[Claims] 1. A first step of printing an ink containing a liquid composition in which a water-soluble dye, a water-insoluble dye or a pigment is dissolved or dispersed as a coloring material on a recording medium by an inkjet recording method, and the recording medium. A second step of applying a microcapsule having a substance having a function of protecting the image as a shell part and a substance having releasability as a core part to the recorded image formed thereon; and protecting the recorded image And a third step of exhibiting a releasing property. 2. The ink jet recording method according to claim 1, further comprising a step of drying the ink on the recording medium immediately after the first step. 3. The inkjet recording method according to claim 1, further comprising a step of irradiating the ink on the recording medium with ultraviolet rays immediately after the first step. 4. The ink jet recording method according to claim 1, wherein the substance having releasability is a soft solid substance. 5. The inkjet recording method according to claim 1, wherein the microcapsules are applied by roll coating, spraying, or an inkjet recording method. 6. The ink jet recording method according to claim 1, wherein the step of exhibiting the function of protecting the recorded image and the releasing property includes heat treatment. 7. The ink jet recording method according to claim 1, wherein the step of exhibiting the function of protecting the recorded image and the releasing property includes a pressure treatment. 8. A means for printing an ink containing a liquid composition in which a water-soluble dye, a water-insoluble dye or a pigment is dissolved or dispersed as a coloring material on a recording medium by an ink jet recording method, and formed on the recording medium. A means for providing a microcapsule having a substance having a function of protecting the image as a shell part and a substance having releasability as a core part to the recorded image, and a function of protecting the recorded image and releasability An inkjet recording apparatus comprising: means for exhibiting the following. 9. The ink jet recording apparatus according to claim 8, further comprising means for drying the ink on the recording medium immediately after printing on the recording medium by the ink jet recording method. 10. The ink jet recording apparatus according to claim 8, further comprising means for irradiating the ink on the recording medium with ultraviolet rays immediately after printing on the recording medium by the ink jet recording method. 11. The method for applying microcapsules encapsulating a substance having a function of protecting a recorded image and a releasing property is roll coating, spraying or an inkjet recording method. Inkjet recording device. 12. A heating means is included as a means for exhibiting a function of protecting a recorded image and a releasing property.
2. The inkjet recording device according to any one of 1. 13. A pressurizing unit as a unit for exhibiting a function of protecting a recorded image and a releasing property.
5. The inkjet recording device according to any one of 1.