JPH10287035A - Ink-jet record method, recorded object, and ink-jet recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable good printing by adding a photopolymerization initiator to a reaction solution and an acrylate monomer and an oligomer to an ink composition respectively when the reaction solution including a reaction agent and the ink composition are adhered to a recording medium, thereby printing the recording medium. SOLUTION: When ink-jet recording is carried out by adhering a reaction solution including a reaction agent and an ink composition to a recording medium, a photopolymerization initiator is added to the reaction solution and, an acrylate monomer and an oligomer are added to the ink composition. Accordingly, printing irregularities are restricted on the recording medium and printing with good quality and high coloration feature is enabled. If ultraviolet rays are projected to the recording medium and/or the recording medium is heated during being recorded or after recorded, a recorded matter with superior friction resistance is obtained. The reaction solution used is preferably one that includes polyhydric metallic salt or polyallylamine, and the ink composition is one that includes a resin emulsion and/or an inorganic oxide colloid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording method, and more particularly, to an ink jet recording method for printing by depositing a reaction liquid and an ink composition on a recording medium.

BACKGROUND ART [0002] Ink jet recording methods include:
This is a printing method in which small droplets of the ink composition fly and adhere to a recording medium such as paper to perform printing. This method has a feature that high-resolution and high-quality images can be printed at a high speed with a relatively inexpensive device. In general, an ink composition used for ink jet recording contains water as a main component, and further contains a coloring component and a wetting agent such as glycerin for the purpose of preventing clogging.

On the other hand, as an ink jet recording method, a method has recently been proposed in which a polyvalent metal salt solution is applied to a recording medium and then an ink composition containing a dye having at least one carboxyl group is applied ( For example, JP-A-5-202328). In this method,
It is stated that an insoluble complex is formed from the polyvalent metal ion and the dye, and the presence of this complex makes it possible to obtain a high-quality image having water resistance and no color bleed.

[0004] Further, by using a color ink containing at least a surfactant or a penetrating solvent for imparting permeability and a salt, and a black ink which thickens or aggregates by the action of the salt, an image is formed. It has been proposed that a high-quality color image having a high density and no color bleed can be obtained (Japanese Patent Laid-Open No. 6-10673).
No. 5). That is, an ink jet recording method has been proposed in which a good image can be obtained by printing two liquids of a first liquid containing a salt and an ink composition.

In addition, an ink jet recording method for printing two liquids has been proposed (for example, see Japanese Patent Application Laid-Open No.
240557, JP-A-3-240558).

[0006]

SUMMARY OF THE INVENTION The present inventors have now found that in such an ink jet recording method for printing two liquids, a good printing can be realized by combining a specific reaction liquid and a specific ink composition. I got The present invention is based on this finding.

Accordingly, an object of the present invention is to provide a method for realizing a good image in an ink jet recording method for printing two liquids.

The ink jet recording method according to the present invention is an ink jet recording method for performing printing by adhering a reaction liquid containing a reactant and an ink composition to a recording medium, wherein the reaction liquid comprises a photopolymerization initiator. Wherein the ink composition comprises an acrylate monomer and an oligomer.

[0009]

DETAILED DESCRIPTION OF THE INVENTION

[Inkjet recording method] The inkjet recording method according to the present invention comprises a step of adhering a reaction liquid containing a reactant and an ink composition to a recording medium.

In the ink jet recording method of the present invention, the reaction liquid contains a photopolymerization initiator, and the ink composition contains acrylate monomers and oligomers.

According to this method, printing bleeding and uneven printing are suppressed on a recording medium, and uneven color mixing in a boundary region of different colors which is often a problem in a color ink jet recording method, that is, color bleeding is prevented. High quality printing which can be effectively prevented and which has excellent coloring properties can be obtained. Further, it is possible to obtain a recorded matter having excellent abrasion resistance.

Further, according to the ink jet recording method of the present invention, by irradiating and / or heating the recording medium with ultraviolet light during or after recording, it is possible to obtain a recorded matter having even more excellent abrasion resistance, and to obtain a metal or plastic. And a non-absorbable medium such as this can provide a recorded matter which is clear and excellent in abrasion resistance.

[Reaction solution] The reaction solution used in the present invention contains a photopolymerization initiator. The photopolymerization initiator is 220 n
A substance that absorbs light and heat having a wavelength in the ultraviolet region of m to 400 nm and generates radicals, and specifically includes benzoin methyl ether, benzoin ethyl ether, 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.
In addition, Vicure 10, 30 (trademark: Stauf)
fer Chemical), Irgacure1
84, 651 (trademark: manufactured by CIBA GEIGY), Darocure 1173 (trademark: EMC)
chemical), Quantacure CTX,
There are also commercially available photopolymerization initiators such as ITX (trademark: manufactured by Aceto Chemical).

[0014] The reaction solution used in the present invention basically comprises at least a polyvalent metal salt or polyallylamine.

The polyvalent metal salt which can be used in the reaction solution is composed of a polyvalent metal ion having two or more valences and an anion bonded to the polyvalent metal ion, and includes a salt soluble in water. . Specific examples of polyvalent metal ions include Ca ²⁺ , Cu
Divalent metal ions A such as ²⁺ , Ni ²⁺ , Mg ²⁺ , Zn ²⁺ , Ba ^2+
Examples include trivalent metal ions such as l ³⁺ , Fe ³⁺ , and Cr ³⁺ .
The _{^{anion, Cl -, NO 3 -,}} I -, Br -, ClO 3 - and C
H ₃ COO- ^{and the} like.

In particular, a metal salt composed of Ca ²⁺ or Mg ²⁺ gives favorable results from the two viewpoints of the pH of the reaction solution and the quality of the printed matter obtained.

The concentration of these polyvalent metal salts in the ink composition may be appropriately determined within the range where the effect of preventing printing quality and clogging can be obtained, but is preferably about 0.1 to 40% by weight. Preferably, it is about 5 to 25% by weight.

In a preferred embodiment of the present invention, the polyvalent metal salt comprises divalent or higher polyvalent metal ions and nitrate ions or carboxylate ions bound to these polyvalent metal ions, and is soluble in water. It is preferred that

Here, the carboxylate ion is preferably derived from a saturated fatty acid monocarboxylic acid having 1 to 6 carbon atoms or a carbocyclic monocarboxylic acid having 7 to 11 carbon atoms. Preferred examples of the saturated aliphatic monocarboxylic acid having 1 to 6 carbon atoms include formic acid, acetic acid, propionic acid, butyric acid,
Isobutyric acid, valeric acid, isovaleric acid, pivalic acid, hexanoic acid and the like. Particularly, formic acid and acetic acid are preferable.

A hydrogen atom on the saturated aliphatic hydrocarbon group of the monocarboxylic acid may be substituted with a hydroxyl group, and a preferred example of such a carboxylic acid is lactic acid.

Preferred examples of the carbocyclic monocarboxylic acid having 6 to 10 carbon atoms include benzoic acid and naphthoic acid, and more preferably benzoic acid.

The polyallylamine and the polyallylamine derivative as the reactants are cationic polymers which are soluble in water and are positively charged in water. For example, the following formulas (I), (II), and (III) are mentioned.

[0023]

Embedded image

(Wherein X ^- represents chloride ion, bromide ion, iodide ion, nitrate ion, phosphate ion, sulfate ion, acetate ion, etc.) In addition, a polymer obtained by copolymerizing allylamine and diallylamine or diallyl Copolymers of methyl ammonium chloride and sulfur dioxide can also be used.

Further, the reaction liquid may be colored by adding a colorant described in the section of the ink composition described later to have the function of the ink composition.

[Ink composition] The ink composition used in the present invention comprises an acrylate monomer and an oligomer. Specific examples of acrylate monomers and oligomers include acrylamide, phenoxyethyl acrylate, polyethylene glycol diacrylate, epoxy acrylate, urethane acrylate, hydroxypropyl acrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate,
Monomers and oligomers such as hexanediol diacrylate are exemplified.

It is preferable to add the monomers and oligomers in an amount of 0.3 to 30% by weight in the ink composition.

The addition ratio of the monomer and the oligomer can be appropriately selected from the polymerization efficiency, the polymerization rate, the volume shrinkage after the polymerization, the strength of the polymer film, and the like.

The ink composition used in the present invention contains at least a colorant and water.

According to a preferred embodiment of the present invention, the ink composition preferably comprises a resin emulsion. Here, the resin emulsion means an emulsion in which the continuous phase is water and the dispersed phase is the following resin component.
As the resin component of the dispersed phase, acrylic resin, vinyl acetate resin, styrene-butadiene resin, vinyl chloride resin, acrylic-styrene resin, butadiene resin,
Examples include a styrene resin, a crosslinked acrylic resin, a crosslinked styrene resin, a benzoguanamine resin, a phenol resin, a silicone resin, and an epoxy resin.

According to a preferred embodiment of the present invention, the resin is preferably a polymer having both a hydrophilic part and a hydrophobic part. Further, the particle size of these resin components is not particularly limited as long as an emulsion is formed.
Or less, more preferably about 5 to 100 nm.

These resin emulsions can be obtained by dispersion polymerization of a resin monomer in water together with a surfactant, if necessary. For example, an emulsion of an acrylic resin or a styrene-acrylic resin can be obtained by dispersing and polymerizing a (meth) acrylate or a (meth) acrylate and styrene together with a surfactant in water.
The mixing ratio of the resin component and the surfactant is usually 10: 1.
It is preferable to set it to about 5: 1. When the amount of the surfactant used is in the above range, better water resistance and permeability of the ink can be obtained. Preferred examples of the surfactant include anionic surfactants (for example, sodium dodecylbenzenesulfonate, sodium laurate, ammonium salts of polyoxyethylene alkyl ether sulfate, etc.), nonionic surfactants (for example, Ethylene alkyl ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkylphenyl ether, polyoxyethylene alkylamine, polyoxyethylene alkylamide, etc., and these may be used alone or in combination of two or more. Can be used. In addition, acetylene glycol (olefin Y, and Surfynol 82, 104, 440, 465, and 485 (all of them)
Air Products and Chemicals Inc.)) can also be used.

The proportion of the resin and water as the disperse phase component is in the range of 60 to 400 parts by weight of water, preferably 100 to 200 parts by weight, based on 100 parts by weight of the resin.

As such a resin emulsion, known resin emulsions can be used. For example, JP-B-62-1426, JP-A-3-56573, JP-A-3-79678, and JP-A-3-160068. And resin emulsions described in JP-A-4-18462 can be used as they are.

It is also possible to use a commercially available resin emulsion, for example, Microgel E-1000.
2, E-5002 (styrene-acrylic resin emulsion, manufactured by Nippon Paint Co., Ltd.), Boncoat 4001
(Acrylic resin emulsion, manufactured by Dainippon Ink and Chemicals, Inc.) Boncoat 5454 (styrene-acrylic resin emulsion, manufactured by Dainippon Ink and Chemicals, Inc.) SAE-1014 (styrene-acrylic resin emulsion, manufactured by Zeon Corporation) ), Cybinol SK
-200 (acrylic resin emulsion, manufactured by Seiden Chemical Co., Ltd.).

The ink used in the present invention preferably contains a resin emulsion such that the resin component is 0.1 to 40% by weight of the ink, more preferably 1 to 2%.
It is in the range of 5% by weight.

The resin emulsion has an effect of suppressing the penetration of the coloring component and further promoting the fixation to the recording medium by interacting with a reactant, particularly a polyvalent metal ion or polyallylamine or a derivative of polyallylamine. Further, depending on the type of the resin emulsion, a film is formed on the recording medium, which has the effect of improving the abrasion resistance of the printed matter.

Further, the ink composition used in the present invention may contain an inorganic oxide colloid. Preferred examples of the inorganic oxide colloid include colloidal silica,
Alumina colloid is mentioned. These are generally colloidal solutions in which ultrafine particles such as SiO _{2 and} AL ₂ O ₃ are dispersed in water or an organic solvent. As a commercially available inorganic oxide colloid, the dispersion medium is water, methanol, 2-propanol, n-propanol, xylene and the like.
Generally, particles such as iO ₂ and Al ₂ O ₃ have a particle size of 5 to 100 nm. Also, the p of the inorganic oxide colloid solution
H is not in the neutral region, but is often adjusted to be acidic or alkaline. This is because the stable dispersion region of the inorganic oxide colloid exists on the acidic side or the alkaline side, and when added to the ink composition, the pH of the stable dispersion region of the inorganic oxide colloid and the pH of the ink are adjusted. It is necessary to add in consideration.

The amount of the inorganic oxide colloid added in the ink composition is preferably 0.1 to 15% by weight, and two or more kinds can be added.

The colorant contained in the ink composition used in the present invention may be either a dye or a pigment. However, the colorant in the ink is inactivated by the action of insolubilizing or thickening the ink composition. For suppressing penetration, dispersed pigments are more advantageous than dyes dissolved in aqueous media.

The dyes include direct dyes, acid dyes, food dyes, basic dyes, reactive dyes, disperse dyes, vat dyes,
Various dyes usually used for inkjet recording, such as a soluble vat dye and a reactive disperse dye, can be used.

As the pigment, inorganic pigments and organic pigments can be used without any particular limitation. As the inorganic pigment, in addition to titanium oxide and iron oxide, carbon black produced by a known method such as a contact method, a furnace method, and a thermal method can be used. Examples of organic pigments include azo pigments (including azo lakes, insoluble azo pigments, condensed azo pigments, chelated azo pigments, etc.) and polycyclic pigments (for example, phthalocyanine pigments, perylene pigments, perinone pigments, anthraquinone pigments, quinacridone pigments, dioxazines) Pigments, thioindigo pigments,
An isoindolinone pigment, a quinoflurone pigment, a dye chelate (for example, a basic dye type chelate, an acid dye type chelate, etc.), a nitro pigment, a nitroso pigment, and aniline black can be used.

According to a preferred embodiment of the present invention, these pigments are preferably added to the ink as a pigment dispersion obtained by dispersing in an aqueous medium with a dispersant or a surfactant. As a preferred dispersant, a dispersant commonly used for preparing a pigment dispersion, for example, a polymer dispersant can be used. It will be apparent to those skilled in the art that the dispersant and surfactant contained in this pigment dispersion will also function as the dispersant and surfactant of the ink composition.

The amount of the pigment added to the ink is 0.5 to 25.
% By weight, more preferably 2 to 15% by weight.
It is about.

In addition, if necessary, wetting agents, pH adjusting agents, preservatives, fungicides and the like may be added.

[Ink Jet Recording Apparatus] An ink jet recording apparatus for carrying out the ink jet recording method according to the present invention will be described below with reference to the drawings.

The ink jet recording apparatus shown in FIG. 1 is an embodiment in which an ink composition and a reaction liquid are stored in a tank, and the ink composition and the reaction liquid are supplied to a recording head via an ink tube. That is, the recording head 1 and the ink tank 2 are connected by the ink tube 3. Here, the inside of the ink tank 2 is partitioned, and the ink composition,
In some cases, a room for a plurality of color ink compositions and a room for a reaction liquid are provided.

The recording head 1 is moved along a carriage 4 by a timing belt 6 driven by a motor 5. On the other hand, the paper 7 as a recording medium is placed at a position facing the recording head 1 by the platen 8 and the guide 9.
In this embodiment, a cap 10 is provided. A suction pump 11 is connected to the cap 10 to perform a so-called cleaning operation. The sucked ink composition is stored in a waste ink tank 13 via a tube 12.

FIG. 2 is an enlarged view of the nozzle surface of the recording head 1. The portion indicated by 1b is the nozzle surface of the reaction liquid, and the nozzle 21 for discharging the reaction liquid is provided in the vertical direction. On the other hand, the portion indicated by 1c is the nozzle surface of the ink composition, and from the nozzles 22, 23, 24, and 25, the yellow ink composition, the magenta ink composition, the cyan ink composition, and the black ink composition are respectively provided. Discharged.

Further, an ink jet recording method using the recording head shown in FIG. 2 will be described with reference to FIG. The recording head 1 moves in the direction of arrow A. During that move,
The reaction liquid is discharged from the nozzle surface 1b to form a band-like reaction liquid attachment region 31 on the recording medium 7. Next, the recording medium 7 is transported by a predetermined amount in the paper feed direction arrow B. During that time, the recording head 1 moves in the direction opposite to the arrow A in the figure, and returns to the position on the left end of the recording medium 7. Then, the ink composition is printed on the reaction liquid adhering area where the reaction liquid has already adhered, and the
To form

Further, as shown in FIG. 4, in the recording head 1, all the nozzles can be arranged in the horizontal direction. In the figure, 41a and 41b are discharge nozzles of the reaction liquid, and the nozzles 42, 43, 44, and 45 discharge yellow ink composition, magenta ink composition, cyan ink composition, and black ink composition, respectively. You. In the recording head of such an embodiment, printing can be performed both in the forward path and the backward path in which the recording head 1 reciprocates on the carriage, so that the recording head can be printed at a higher speed than when the recording head shown in FIG. 2 is used. Printing can be expected.

Further, by adjusting the surface tensions of the reaction liquid and the ink composition, regardless of the order of their attachment,
High quality printing is obtained more consistently. In this case, the number of the reaction solution discharge nozzles may be one (for example, 4 in the figure).
1b can be omitted), and further downsizing of the head and high-speed printing can be achieved.

Further, in some ink jet recording apparatuses, replenishment of the ink composition is performed by replacing a cartridge which is an ink tank. This ink tank may be integrated with the recording head.

FIG. 5 shows a preferred example of an ink jet recording apparatus using such an ink tank. In the figure, the same members as those of the apparatus of FIG. 1 are denoted by the same reference numerals. In the embodiment of FIG. 5, the recording heads 1a and 1b
Are integrated with the ink tanks 2a and 2b. The recording head 1a or 1b discharges the ink composition and the reaction liquid, respectively. The printing method may be basically the same as that of the apparatus shown in FIG. And in this aspect,
Recording head 1a, ink tank 2a and recording head 1a
The ink tank 2b moves on the carriage 4 together.

FIG. 6 shows a preferred example of an ink jet recording apparatus provided with a device for irradiating and / or heating the recording medium on which printing has been performed during or after recording. FIG. 6 is the same as that shown in FIG. 1 except that an ultraviolet irradiation lamp 15 and a heater 14 are provided. Specific examples of the ultraviolet irradiation lamp 15 include a metal halide lamp and a high-pressure mercury lamp.
For example, commercially available lamps such as H lamp, D lamp and V lamp manufactured by FusionSystem can be used. Further, even if the heater 14 is in contact with the recording medium and heats the recording medium, the heater 14 may emit infrared rays or microwaves (2, 45).
(Electromagnetic wave having a maximum wavelength of about 0 Mhz)
Alternatively, heating may be performed without contacting the recording medium, such as by blowing hot air.

Regarding the adhesion of the reaction liquid to the recording medium, in the present invention, in order to obtain sharp print quality with less bleeding, a method of selectively depositing the reaction liquid only at the place where the ink composition is to be applied. Any method of attaching the reaction solution to the entire surface of the paper may be used.

[0057]

The present invention will be described in more detail with reference to the following examples, but it should not be construed that the invention is limited thereto.

Example 1 (Reaction liquid 1) Magnesium nitrate hexahydrate (reactant) 25% by weight Isobutyl benzoin ether 10% by weight (Photopolymerization initiator) Triethylene glycol monobutyl ether 10% by weight Glycerin 10% by weight % Ion exchange water Remaining amount The above components were mixed and stirred at room temperature for 20 minutes. The solution was filtered through a 5 μm membrane filter to obtain a reaction solution having a desired composition.

(Ink composition 1) Carbon black MA7 5% by weight (manufactured by Mitsubishi Chemical Corporation) Styrene-acrylic copolymer 1% by weight (dispersant) Armatex Z116 3% by weight (Mitsui Toatsu Chemical Co., Ltd.) Made, resin emulsion, resin component 5
0 wt%) Snowtex S 1.5 wt% (Nissan Chemical Co., Ltd., colloidal silica SiO2 content 30 wt%) Trimethylol cellulose triacrylate 10 wt% (acrylate monomer) UV2270 3 wt% (trademark: epoxy acrylate oligomer) Multi Toll 7% by weight Glycerin 10% by weight 2-pyrrolidone 2% by weight Ion-exchanged water balance Carbon black, a dispersant and ion-exchanged water are mixed, and glass beads (diameter 1.7 mm, mixture) are mixed in a sand mill (manufactured by Yasukawa Seisakusho). 1.5 times the amount (weight) of
Time dispersed. Thereafter, the glass beads were removed, other additives were added, and the mixture was stirred at room temperature for 20 minutes. The mixture was filtered through a 5 μm membrane filter to obtain an inkjet recording ink having a desired composition.

Comparative Example 2 (Reaction Liquid 2) Polyallylamine PAA-10C 25% by weight (manufactured by Nitto Boseki Co., Ltd., reactant, resin component 10% by weight) Triethylene glycol monobutyl ether 10% by weight Glycerin 10% by weight ion exchange Water remaining amount The above components were mixed and stirred at room temperature for 20 minutes. The solution was filtered through a 5 μm membrane filter to obtain a reaction solution having a desired composition.

(Ink composition 2) Carbon black MA7 5% by weight (manufactured by Mitsubishi Chemical Corporation) Styrene-acrylic copolymer 1% by weight (dispersant) Armatex Z116 3% by weight (Mitsui Toatsu Chemicals, Inc.) Made, resin emulsion, resin component 5
0% by weight) Snowtex S 1.5% by weight (Nissan Chemical Co., Ltd., colloidal silica SiO2 content 30% by weight) Maltitol 7% by weight Glycerin 10% by weight 2-pyrrolidone 2% by weight Ion exchange water Remaining amount Dispersed with carbon black The mixture was mixed with ion-exchanged water and mixed in a sand mill (manufactured by Yasukawa Seisakusho) together with glass beads (diameter 1.7 mm, 1.5 times the weight (weight) of the mixture).
Time dispersed. Thereafter, the glass beads were removed, other additives were added, and the mixture was stirred at room temperature for 20 minutes. The mixture was filtered through a 5 μm membrane filter to obtain an inkjet recording ink having a desired composition.

[Print Evaluation Test] Evaluation 1: Print Quality (Bleeding) Printing was performed on each of the following papers using an inkjet printer MJ-500C (manufactured by Seiko Epson Corporation). For printing, first, solid (100% duty) was printed with the reaction solution, and then black ink characters were printed thereon. After drying, the presence or absence of blurring in the characters was examined.

Xerox P (Xerox Corp.) Ricopy 6200 (Ricoh Corp.) Xerox 4024 3R 721 (Xerox Corp.) Neenah Bond (Kimberly Clark Corp.) Xerox R (Xerox Corp.) Yamayuri (Manufactured by Honshu Paper Co., Ltd.) The results were as shown in Table 1. In the table, ：: clear printing without bleeding, Δ: whisker-like bleeding, ×: bleeding so that the outline of characters is not clear.

Evaluation 2: Printing Quality (OD Value) The reflection OD value of the printed matter obtained in the section of the printing quality (bleeding) was measured with Macbeth PCMII (manufactured by Macbeth) and averaged. The results are as shown in Table 1.

When the reflection OD value of black exceeds 1.4, there is no problem in practical use. However, when the reflection OD value exceeds 1.5, it looks visually very dark, and almost all printer users have good print quality. It has the impression that. Further, when this is used as a color ink of yellow, magenta, cyan, or the like, color development is improved, a color reproduction range is widened, and an image of good quality is obtained.

[0066]

[Table 1]

Evaluation 3: Recording on Non-Absorptive Medium In the same manner as in Evaluation 1, printing was performed on a PET film. After printing, in Example 1, when the printed surface was strongly rubbed with a finger, the characters were peeled off and the printed surface was stained. However, the printed surface was not stained even if the recorded matter was left at room temperature for one day and rubbed similarly. In the comparative example, the printed surface was stained even after one day.

Similarly, when the recording medium was heated from the back side with a heater at 100 ° C. for 5 seconds immediately after printing on the PET film, in Example 1, the printed surface was not stained even when strongly rubbed with a finger.

Further, similarly, immediately after printing on the PET film, the recording medium was irradiated with ultraviolet rays for 3 seconds at an output of 80 W / cm from a printing surface using a high-pressure mercury lamp having a peak wavelength at 365 nm. The printed surface was not stained even when strongly rubbed with a finger.

[Brief description of the drawings]

FIG. 1 is a view showing an ink jet recording apparatus preferably used for carrying out an ink jet recording method according to the present invention. In this embodiment, a recording head and an ink tank are independent, and an ink composition and a reaction liquid are ink. It is supplied to the recording head by a tube.

FIG. 2 is an enlarged view of a nozzle surface of a recording head, where 1b is a nozzle surface of a reaction liquid and 1c is a nozzle surface of an ink composition.

FIG. 3 is a diagram illustrating an ink jet recording method using the recording head of FIG. In the figure, reference numeral 31 denotes a reaction liquid adhering area, and reference numeral 32 denotes a printing area where the ink composition is printed on the reaction liquid adhering thereto.

FIG. 4 is a diagram showing another embodiment of a recording head preferably used for carrying out the ink jet recording method according to the present invention, in which all ejection nozzles are arranged in a horizontal direction.

FIG. 5 is a view showing an ink jet recording apparatus preferably used for carrying out the ink jet recording method according to the present invention. In this embodiment, a recording head and an ink tank are integrated.

FIG. 6 is a view showing an ink jet recording apparatus preferably used for carrying out the ink jet recording method according to the present invention. In this embodiment, the apparatus is provided with a device for irradiating and / or heating a recording medium after printing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recording head 2 Ink tank 3 Ink tube 14 Heater 15 Ultraviolet irradiation lamp 21 Reaction liquid discharge nozzle 22, 23, 24, 25 Ink composition discharge nozzle 31 Reaction liquid adhesion area 32 Printing area

Claims (9)

[Claims] An ink jet recording method for printing by attaching a reaction liquid containing a reactant and an ink composition to a recording medium, wherein the reaction liquid contains a photopolymerization initiator, and the ink composition Comprises an acrylate monomer and an oligomer. 2. The ink jet recording method according to claim 1, wherein said acrylate monomer and oligomer are contained in an amount of 0.3 to 30% by weight. 3. The ink jet recording method according to claim 1, wherein the reactant contacts the ink composition to form an aggregate. 4. The ink jet recording method according to claim 3, wherein the reactant is a polyvalent metal salt, or polyallylamine or a derivative thereof. 5. The ink jet recording method according to claim 1, wherein said ink composition comprises a resin emulsion and / or an inorganic oxide colloid. 6. The ink jet recording method according to claim 5, wherein the inorganic oxide colloid is colloidal silica. 7. The ink-jet recording method according to claim 1,
The inkjet recording method according to any one of claims 1 to 6, wherein the recording medium is irradiated with ultraviolet light and / or heated. 8. A recorded matter printed by the method according to claim 1. Description: 9. An ink jet recording apparatus for performing an ink jet recording method for performing printing by adhering a reaction liquid containing a photopolymerization initiator and an ink composition containing an acrylate monomer and an acrylate oligomer to a recording medium. Means for adhering the reaction liquid to a recording medium, ink jet recording means for forming droplets of the ink composition, and adhering the droplets to the recording medium, and the recording medium to which the ink composition has adhered And a means for irradiating and / or heating the ultraviolet ray.