JP6160132B2 - Inkjet image recording method - Google Patents

Description

  The present invention relates to an inkjet image recording method, and more specifically, an inkjet image recording method for forming an image by ejecting ink droplets onto an inkjet recording sheet having an ink receiving layer on at least one side of a substrate. About.

  The ink jet method is a printing method in which ink droplets are ejected and applied directly to a substrate to be printed. Due to its simplicity, excellent image quality, and the like, inkjet printers for computer output using the inkjet method are widely used in home and industrial applications.

  In recent years, many examples of applying the inkjet method to the formation of a color filter constituting a pixel of a display device typified by a liquid crystal display have been reported because of its simplicity and the ability to pattern a predetermined material only on a predetermined portion. ing.

  However, in the method of forming a high-definition pattern such as a color filter by the ink jet method, it is easy for ink particles to be scattered by the ink jet and ink bleeding, so a print pattern with a sharp shape and sharp edges can be obtained. It is difficult.

  Further, when forming a member of a display device, a non-liquid-absorbing substrate such as glass or a plastic film is often used as a substrate to be printed, and the dryness is extremely poor as it is.

  In recent years, many patents have been filed for forming an ink receiving layer on a substrate in order to prevent the scattering of ink particles, ink bleeding and spreading, and improve the drying property of ink. For example, Patent Literature 1 and Patent Literature 2 propose a method in which an ink-absorbing resin layer is laminated on a substrate provided with a black matrix, and ink wettability of the opening and the light-shielding portion is controlled by light irradiation or the like. . Further, in Patent Document 3, an ink-absorbing resin layer is provided on a substrate, a portion having high ink wettability and a portion having low ink wettability are formed by light irradiation or the like, and a colored ink is applied to a portion having high ink wettability. There has been proposed a method of arranging a light-shielding member on the surface.

  However, in any of the techniques of Patent Documents 1 to 3, it is necessary to form a portion with high ink wettability and a portion with low ink wettability by light irradiation or the like. If an image is formed without this forming step, the ink bleeds and spreads. It becomes a problem and the resolution of the image tends to decrease.

  In order to solve this problem, in Patent Document 4, the ink receiving layer is composed of a microporous lower layer and an upper layer having a lower porosity, thereby preventing a decrease in resolution by rapid absorption of ink. A method for preventing fading when using a dye ink has been proposed.

  Further, in Patent Document 5, a layer containing a gelling agent for fixing an alcohol solvent in ink is provided between a porous ink-receiving layer containing fine particles and a base material, thereby spreading or spreading ink. There has been proposed a method that achieves both control of image quality and durability over time after image formation.

  However, neither of the techniques of Patent Documents 4 and 5 has a single ink receiving layer structure, and the formation thereof requires labor other than a single coating, Therefore, it is expected that there is a limit to combinations of inks that can enjoy the above advantages.

  On the other hand, in Patent Document 6, when forming a color filter for a display device, ink is applied through a film having holes corresponding to colored pixels on a substrate, and finally the hole film is removed. A method has been proposed.

  However, in the technique of Patent Document 6, it goes without saying that the number of steps such as production of a porous film, alignment with a substrate, bonding, and peeling is a disadvantage.

JP-A-8-338905 JP-A-9-15580 JP-A-9-26508 Special table 2007-502220 gazette JP 2004-255690 A JP 2010-237706 A

  An object of the present invention is to provide an ink jet image recording method that can control the bleeding and spreading of ink and can also be used for forming high-definition patterns such as color filters and electrode circuits for display devices. .

The present invention employs the following configuration in order to solve the above problems.
One aspect of the present invention is an ink jet image recording method for forming an image by ejecting ink droplets onto an ink jet recording sheet having an ink receiving layer on at least one side of a base material, which is contained in the ink. An image is formed by ejecting ink droplets on an ink receiving layer containing at least one organic solvent identical to the organic solvent.
The ink jet image recording method according to one aspect of the present invention is used, for example, to form a high-definition pattern of a color filter or an electrode circuit for a display device.

  The organic solvent to be used preferably has a boiling point of 150 ° C. or higher and 250 ° C. or lower. The content of the organic solvent in the ink receiving layer is preferably 0.1% by weight or more and 1% by weight or less, and the content of the organic solvent in the ink is 1% by weight or more and 40% by weight or less. It is preferable.

The organic solvent to the ink receiving layer as a method to contain 1 wt% or less than 0.1 wt%, there is a way to store the Lee inkjet recording sheet under an organic solvent atmosphere.

  Moreover, after recording an image by the inkjet image recording method, the organic solvent contained in the ink receiving layer can be removed by drying the inkjet recording sheet.

Since the present invention has the above-described features, it can be described below.
Since the ink receiving layer for image recording contains at least one organic solvent identical to the organic solvent contained in the ink, the affinity between the ink and the ink receiving layer can be maintained. It is absorbed quickly. Further, by changing the content of the organic solvent, the affinity between the ink and the ink receiving layer can be adjusted, and the spread of the ink can be controlled.

Hereinafter, an inkjet image recording method according to an embodiment of the present invention will be described in detail.
The inkjet image recording method of the present invention is an inkjet image recording method for forming an image by ejecting ink droplets onto an inkjet recording sheet having an ink receiving layer on at least one side of a substrate. In particular, in the inkjet image recording method of the present invention, the ink receiving layer contains at least one organic solvent identical to the organic solvent contained in the ink, and ink droplets are ejected onto such an ink image receiving layer. And forming an image.

(Base material)
Substrates used for inkjet recording sheets include hardwood bleached kraft pulp (LBKP), hardwood bleached sulfite pulp (LBSP), hardwood dissolved pulp (LDP), softwood bleached kraft pulp (NBKP), softwood bleached subsulfite pulp ( Chemical pulp such as NBSP), softwood dissolving pulp (NDP), ground pulp (GP), pressurized ground pulp (PGW), refiner mechanical pulp (RMP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP) Paper, cotton, hemp, silk, or chemical fiber, mainly composed of mechanical pulp such as chemimechanical pulp (CMP) and chemiground pulp (CGP), and pulp such as waste paper pulp such as deinked pulp (DIP) Etc., and fabrics that are bonded together. Can.

  Moreover, a transparent base material can also be used for the base material used for the inkjet recording sheet. For example, alkali-free glass or soda glass can be used. Or what processed the flexible substrate, such as a plastics, as a support substrate can also be used. For example, polyethylene, polypropylene, polyester, cellophane, polyurethane, polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, cycloolefin polymer, polyimide, nylon, aramid, polycarbonate, polymethyl methacrylate, polyvinyl chloride, triacetyl cellulose, etc. Films and sheets can be used.

(Ink receiving layer)
A known material can be used for the resin constituting the ink receiving layer, but performance such as no discoloration or fading of the ink and various resistances is required. Therefore, one or more of a wide variety of resins such as polyvinyl alcohol and its modified products, acrylic copolymer resins, and polyurethanes are appropriately selected and used for the ink receiving layer.

  As the polyvinyl alcohol, those having a saponification degree of about 50 to 90% are preferable, and modified polyvinyl alcohol obtained by cation modification or acetalization of these may be used.

  The acrylic monomer of the acrylic copolymer component includes a cationic acrylic monomer having a quaternary ammonium base, such as (meth) acryloyloxytrimethylammonium chloride, (meth) acryloyloxytrimethylammonium bromide, (meth) Acroyloxytrimethylammonium iodide, (meth) acryloyloxydimethylmethylammonium sulfate, (meth) acryloyloxydimethylethylammonium sulfate, (meth) acryloyloxyhydroxypropyltrimethylammonium acetate, (meth) acrylamidopropyltrimethyl Ammonium chloride, (meth) acrylamidopropyltrimethylammonium bromide, (meth) acrylamidopropyltrimethyl Ammonium iodide, (meth) acrylamidopropyltrimethylammonium methyl sulfate, (meth) acrylamidopropyltrimethylammonium p-toluenesulfonate, (meth) acrylamidopropyltridimethylhydroxypropylammonium acetate, allyltrimethylammonium chloride, methacroline chloride, Examples include methacroline bromide and methacroline iodide, and a mixture thereof may be used.

  Examples of the monomer other than the cationic acrylic monomer include acrylamide monomers such as acrylic amide, methacrylic amide, dimethylacrylamide, and vinyl pyrrolidone. A mixture thereof may also be used.

Polyurethane is obtained by reacting a compound having a terminal hydroxyl group or amino group with an organic isocyanate compound.
Examples of the hydroxyl group-terminated compound include polyethylene glycol, polyethylene glycol / polytetramethylene glycol copolymer polyol, polyethylene glycol / polypropylene glycol copolymer polyol, polyethylene glycol adipate, polyethylene glycol succinate, polyethylene glycol / poly-ε-caprolactone. Examples thereof include a copolymer polyol and a polyethylene glycol / poly-valerolactone copolymer polyol. Here, “/” as described in, for example, polyethylene glycol / polytetramethylene glycol copolymer polyol indicates a copolymer polyol of polyethylene glycol and polytetramethylene glycol in this example.
Examples of the terminal amino group compound include polyethylene oxide diamine, polyethylene oxide propylene oxide diamine, polyethylene oxide triamine, and polyethylene oxide propylene oxide triamine.

  It is also effective to contain fine particles (fillers) in these resins in order to improve the adhesion between the ink receiving layer and the substrate. As the filler, fine inorganic silicic acid is used for inorganic fine particles, and acrylic resin, styrene resin, urea formaldehyde resin, benzoguanamine resin, silicone resin, fluororesin and the like are appropriately selected for organic fine particles. Further, the addition amount of the filler is preferably 1 to 20 parts with respect to 100 parts by weight of the resin constituting the ink receiving layer. If it is less than 1 part, the effect of the filler hardly appears, and if it exceeds 20 parts, the transparency and flatness of the ink receiving layer are impaired, which is not preferable.

  In addition, for the purpose of improving various resistances of the printed matter, the ink receiving layer can be cured by ultraviolet irradiation or the like after ink jet printing. Examples of the photopolymerization initiator used in this case include 4-phenoxydichloroacetophenone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 2-benzyl-2-dimethylamino- Acetophenone compounds such as 1- (4-morpholinophenyl) -butan-1-one, benzoin compounds such as benzoin, benzoin methyl ether, and benzyldimethyl ketal, benzophenone, benzoylbenzoic acid, 4-benzoyl-4′-methyl Benzophenone compounds such as diphenyl sulfide, thioxanthone compounds such as thioxanthone, 2-chlorothioxanthone, 2,4-diethylthioxanthone, 2,4,6-trichloro-s-triazine, 2- (p-tolyl) 4,6- Bis (trichloromethyl)- -Triazine compounds such as triazine, 2,4-bis (trichloromethyl) -6-styryl-s-triazine, 1,2-octanedione, 1- [4- (phenylthio) -2- (O-benzoyloxime) ], O- (acetyl) -N- [1-phenyl-2-oxo-2- (4′-methoxy-naphthyl) ethylidene] oxime ester compounds such as hydroxylamine, bis (2,4,6-trimethylbenzoyl) ) Phosphine compounds such as phenylphosphine oxide, 2,4,6-trimethylbenzoylphenylphosphine oxide, quinone compounds such as 9,10-phenanthrenequinone, camphorquinone, borate compounds, carbazole compounds, imidazole compounds , Titanocene compounds, and the like. Not. These compounds can be used alone or in admixture of two or more.

  In addition, you may use together hardening | curing agents, such as an epoxy-type compound, an isocyanate type compound, and an amine compound, in order to improve the water resistance of the film of these resin.

(Organic solvent contained in both ink and ink receiving layer)
In addition to the high boiling point and low volatility that can remain in the ink receiving layer, the organic solvent that is commonly contained in the ink and the ink receiving layer must have characteristics required for general inkjet inks. That is, it is preferable that the boiling point is 130 ° C. or more and the suitable surface tension range in the ink jet system is 40 mN / m or less. When the surface tension exceeds 40 mN / m, the dot shape stability during ink jet ejection is significantly adversely affected, and when the boiling point is less than 130 ° C., the drying property in the vicinity of the nozzle becomes remarkably high. This is not preferable because it causes clogging and other defects. The boiling point is more preferably 150 ° C. or more and 250 ° C. or less. When the boiling point is less than 150 ° C., it hardly remains in the ink receiving layer. When the boiling point exceeds 250 ° C., in addition to requiring significant energy when drying after ink jet printing, the surface of the ink receiving layer is adhesive. May occur, which is not preferable.

  Specifically, examples of the organic solvent include 2-ethoxyethanol, 2-butoxyethanol, 2-ethoxyethyl acetate, 2-butoxyethyl acetate, 2-methoxyethyl acetate, 2-ethoxyethyl ether, 2- (2-ethoxy Ethoxy) ethanol, 2- (2-butoxyethoxy) ethanol, 2- (2-ethoxyethoxy) ethyl acetate, 2- (2-butoxyethoxy) ethyl acetate, 2-phenoxyethanol, glycerin, ethylene glycol, diethylene glycol, triethylene glycol , Propylene glycol, dipropylene glycol, hexylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,2,4-butanetriol, 2,2′-thiodiethanol, polyethyleneglycol , Polypropylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, 1,4-lactone, N methyl 2-pyrrolidone, 1.3- Examples include, but are not limited to, dimethylimidazolidinone, monoethanolamine, N, N-dimethylethanolamine, N, N-diethylethanolamine, diethanolamine, Nn-butyldiethanolamine, triisopropanolamine, and triethanolamine. Is not to be done. These can be used alone or in admixture of two or more.

(Formation of ink receiving layer)
When the ink receiving layer is formed using the above materials, one or two of water, methanol, ethanol, isopropyl alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone, tetrahydrofuran, ethyl acetate, toluene, xylene and the like are used. It is used as a coating liquid having a solid content concentration of 1 to 50% by weight using the above mixed solvent.

  Further, when forming the ink receiving layer, a coating liquid to which the ink and the organic solvent commonly contained in the ink receiving layer are added is used, and the content of the organic solvent in the ink receiving layer is 0.1% by weight or more. When the ink receiving layer in which the organic solvent remains is formed by drying to 1% by weight or less, the content of the organic solvent is preferably 1 to 20% by weight with respect to the total amount of the coating liquid. If the content of the organic solvent is less than 1% by weight, it is difficult to leave 0.1% by weight or more in the ink receiving layer, and if it exceeds 20% by weight, the remaining amount in the ink receiving layer becomes 1% by weight or less. It is not preferable because it is difficult to suppress.

  The content of the organic solvent commonly contained in the ink and the ink receiving layer is preferably 0.1 wt% or more and 1 wt% or less in the ink receiving layer. If the content of the organic solvent is less than 0.1% by weight, it is difficult to absorb the ink quickly because the affinity with the ink is insufficient, and if it exceeds 1% by weight, the tackiness of the ink receiving layer becomes remarkable. Therefore, it is not preferable.

  The content of the organic solvent in the ink receiving layer can be measured by sealingly heating the ink receiving layer cut out to a specified size and measuring the generated gas with a gas chromatograph / mass spectrometer.

  In addition, according to the purpose, a resin other than those described above, or a surfactant, an ultraviolet absorber, an antioxidant, a pH adjuster, an antifoaming agent and other additives may be appropriately mixed in the coating solution. good.

  When forming an ink receiving layer using the above coating liquid, a well-known coating method can be used. Examples include die coating, dipping method, roll coating, gravure coating, reverse coating, air knife coating, comma coating, screen printing method, spray coating, gravure offset method, and ink jet method. Among these, die coating is a preferable forming method because a uniform coating film can be formed.

  When the ink receiving layer is applied as described above, a resin layer having higher adhesion to the base material, such as a thermosetting or ultraviolet curable acrylic resin or epoxy resin, is preliminarily used as an anchor layer. It can also be provided on the material and in the upper layer.

  For drying the coating solution coated as described above, natural drying, cold / hot air drying, microwave drying, reduced pressure drying, etc. can be used, and radiation such as ultraviolet rays and electron beams was used. Can also be dried. However, when the ink receiving layer is formed, the organic solvent content in the ink receiving layer is 0.1% by weight or more using a coating liquid to which the ink and the organic solvent commonly contained in the ink receiving layer are added. When the ink receiving layer in which the organic solvent remains is formed by drying to 1% by weight or less, the output and time must be adjusted so that the content of the organic solvent in the ink receiving layer is within the above range. Don't be.

  The dry film thickness of the ink receiving layer formed as described above is preferably 0.05 μm or more and 30 μm or less, more preferably 0.5 μm or more and 15 μm or less. If it is less than 0.05 μm, it becomes impossible to receive ink, and if it exceeds 30 μm, the film thickness becomes thick and the coating film thickness accuracy decreases, which is not preferable.

(Storage of inkjet recording sheet)
The inkjet recording sheet formed as described above is preferably stored at 70% RH or less, and more preferably 50% RH or less. Storage at 70% RH or more is not preferable because water in the air is absorbed into the ink receiving layer and printing performance may change.

  Further, when storing the ink jet recording sheet, the organic solvent content in the ink receiving layer is 0.1 wt% or more by storing it in the presence of the organic solvent commonly contained in the ink and the ink receiving layer. When the content is not more than% by weight, the ink receiving layer may be stored so as to be in contact with the vapor of the organic solvent. For example, the ink receiving layer can be brought into contact with the vapor of the organic solvent by storing the ink jet recording sheet, the ink, and the non-woven fabric containing the organic solvent contained in the ink receiving layer in the same container. .

(ink)
The ink material is composed of a color pigment, a solvent, a resin, a dispersant, and the like, and a material obtained by adding an organic solvent contained in common to the ink and the ink receiving layer is used.

  As pigments used in the ink, Pigment Red 9, 19, 38, 43, 97, 122, 123, 144, 149, 166, 168, 177, 179, 180, 192, 215, 216, 208, 216, 217 , 220, 223, 224, 226, 227, 228, 240, Pigment Blue 15, 15: 6, 16, 22, 29, 60, 64, Pigment Green 7, 36, Pigment Red 20, 24, 86, 81, 83 93, 108, 109, 110, 117, 125, 137, 138, 139, 147, 148, 153, 154, 166, 168, 185, Pigment Orange 36, Pigment Violet 23, and the like. It is not something. These may be used in combination of two or more in order to obtain the desired hue.

  In combination with the above pigments, inorganic pigments can also be used in combination in order to ensure good coatability, sensitivity, developability, etc. while balancing saturation and lightness. Examples of inorganic pigments include yellow lead, zinc yellow, red pepper, cadmium and the like, ultramarine, bitumen, chromium oxide green, cobalt green and other metal oxide powders, metal sulfide powders, metal powders and the like. Furthermore, for color matching, a dye can be contained within a range that does not lower the heat resistance.

  Examples of the resin used in the ink include, but are not limited to, casein, gelatin, polyvinyl alcohol, carboxymethyl acetal, polyimide resin, acrylic resin, epoxy resin, melamine resin, and modified ones thereof. . An acrylic resin is preferred when heat resistance and light resistance are required.

As the solvent used for the ink, those having an appropriate surface tension range of 40 mN / m or less in the ink jet system and a boiling point of 130 ° C. or more are preferable. When the surface tension is 40 mN / m or more, the dot shape stability at the time of ink jet discharge is significantly adversely affected, and when the boiling point is 130 ° C. or less, the drying property in the vicinity of the nozzle is remarkably increased. This is not preferable because it causes a defect such as nozzle clogging.
Specifically, 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, 2-ethoxyethyl acetate, 2-butoxyethyl acetate, 2-methoxyethyl acetate, 2-ethoxyethyl ether, 2- (2-ethoxy Ethoxy) ethanol, 2- (2-butoxyethoxy) ethanol, 2- (2-ethoxyethoxy) ethyl acetate, 2- (2-butoxyethoxy) ethyl acetate, 2-phenoxyethanol, diethylene glycol dimethyl ether, and the like. It is not limited. These can be used alone or in admixture of two or more.

  The content of the organic solvent contained in the ink and the ink receiving layer in the ink is preferably 1% by weight or more and 40% by weight or less based on the total amount of the ink. If the content of the organic solvent is less than 1% by weight, it is difficult to be absorbed quickly while maintaining the affinity with the ink receiving layer, and if it exceeds 40% by weight, it is extremely difficult to dry the ink after image formation. Since energy is required, it is not preferable.

  Further, a dispersant may be used in order to improve the dispersion of the pigment in the resin. As the dispersant, nonionic surfactants such as polyoxyethylene alkyl ether, ionic surfactants such as sodium alkylbenzene sulfonate, poly fatty acid salt, fatty acid salt alkyl phosphate, tetraalkyl ammonium salt, Examples thereof include organic pigment derivatives and polyester. These can be used alone or in admixture of two or more.

(Pattern printing by inkjet method)
As an ink jet apparatus for supplying ink, there are a piezo conversion method and a heat conversion method depending on the ink discharge method, and the piezo conversion method is particularly preferable. When forming a color filter or the like for a display device, the ink particleization frequency is about 5 to 100 KHz, the nozzle diameter is about 5 to 80 μm, three heads are arranged, and 60 to 500 nozzles are incorporated in one head. A device is preferred.

  After removing the organic solvent remaining in the ink and ink receiving layer of the ink jet recording sheet after the image is recorded by the ink jet image recording method, natural drying, hot plate drying, cold / hot air drying, microwave drying, vacuum drying Etc., and can also be dried using radiation such as ultraviolet rays and electron beams.

  An embodiment of the present invention will be described below, but the present invention is not limited to this within the scope not departing from the gist of the present invention.

Example 1
As the ink receiving layer coating solution, a solution prepared with the following composition was used. Diethylene glycol monoethyl ether acetate was used as an organic solvent commonly contained in the ink and the ink receiving layer.

[Composition of ink receiving layer coating solution]
-Silica 2 parts-Acrylic polymer 18 parts-2-propanol 50 parts-Toluene 25 parts-Diethylene glycol monoethyl ether acetate 5 parts

The colored ink was prepared as follows.
First, a mixture having the following composition was kneaded with three rolls to prepare each pigment dispersion.

[Composition of pigment dispersion]
・ Acrylic varnish (solid content 10%) 80 parts by weight ・ Pigment 19 parts by weight ・ Dispersant 1 part by weight

  Next, each pigment dispersion is prepared with a solvent having the following composition so that the pigment concentration is 12 to 15% and the viscosity is 15 cps, and coloring of red (R), green (G), and blue (B) is performed. Ink was obtained.

[Composition of solvent for colored ink]
・ Propylene glycol monomethyl ether acetate 82 parts by weight ・ Diethylene glycol monoethyl ether acetate 18 parts by weight

  A light-transmitting PET film having a thickness of 100 μm and a thickness of 300 mm □ was used as the base material of the inkjet recording sheet.

  First, the coating liquid was coated on the PET film by a die coater equipped with a 200 mm wide head so that the coating length was 200 mm and the thickness of the dried ink receiving layer alone was 10 μm. . The ink receiving layer coating solution on the PET film was dried for 3 minutes on a 100 ° C. hot plate to prepare an ink jet recording sheet.

  Next, within 1 hour from the preparation of the ink jet recording sheet, the R, G, and B colored inks are ejected to the same place by 10 drops onto the ink jet recording sheet with a 6 pl head. A pattern was formed.

  And the formed printing pattern was observed with the optical microscope, and the diameter of the dot-shaped pattern was measured. Further, the ink receiving layer was peeled off from the ink jet recording sheet produced under the same conditions as those used for printing, and the residual amount of diethylene glycol monoethyl ether acetate was measured with a gas chromatograph / mass spectrometer. Further, the surface of the ink receiving layer was touched with a fingertip to confirm the presence or absence of tackiness.

  As a result of Example 1, the diameter of the dot pattern consisting of 10 drops was R: 95 μm, G: 95 μm, B: 93 μm. The amount of diethylene glycol monoethyl ether acetate in the ink receiving layer was 0.20% by weight. The ink receiving layer was sticky, but not so as to leave a mark.

(Comparative Example 1)
The same experiment as in Example 1 was performed, except that a solution prepared with the following composition was used as the ink receiving layer coating solution.

[Composition of ink receiving layer coating solution]
-Silica 2 parts-Acrylic polymer 18 parts-2-propanol 55 parts-Toluene 25 parts

  As a result of Comparative Example 1, the diameter of the dot-shaped pattern consisting of 10 drops was R: 106 μm, G: 107 μm, B: 102 μm. The amount of diethylene glycol monoethyl ether acetate in the ink receiving layer was 0.00% by weight. The ink receiving layer was not sticky.

(Comparative Example 2)
The same experiment as in Example 1 was performed, except that a solution prepared with the following composition was used as the ink receiving layer coating solution.

[Composition of ink receiving layer coating solution]
Silica 2 parts by weight Acrylic polymer 18 parts by weight 2-propanol 25 parts by weight Toluene 25 parts by weight Diethylene glycol monoethyl ether acetate 30 parts by weight

  As a result of Comparative Example 2, the diameter of the dot-shaped pattern consisting of 10 drops was R: 88 μm, G: 85 μm, B: 81 μm. The amount of diethylene glycol monoethyl ether acetate in the ink receiving layer was 1.57% by weight. The ink receiving layer was sticky, and a mark remained on the touched part.

  Based on the above results, the ink receiving layer for image recording contains at least one organic solvent identical to the organic solvent contained in the ink, and the content of the organic solvent in the ink receiving layer is changed (adjusted). Thus, it was confirmed that the spread of the ink can be controlled.

  Since the ink jet image recording method of the present invention can control the spread of ink, it can be used as an image recording method for home or industrial use, as well as a color pattern, black matrix, It can also be used for the production of organic EL elements such as white matrix, color filter members such as spacers, electrode circuits such as gate electrodes, source electrodes, drain electrodes, gate insulating films, transistor members such as organic semiconductor materials, and organic light emitting layers.

Claims (5)

An inkjet image recording method for forming an image by ejecting ink droplets onto an inkjet recording sheet having an ink receiving layer on at least one side of a substrate,
By storing the inkjet recording sheet in an atmosphere of the same organic solvent as the organic solvent contained in the ink, the ink receiving layer contains the organic solvent in an amount of 0.1 wt% to 1 wt%. Let
An ink jet image recording method, wherein an image is formed by ejecting droplets of the ink on the ink receiving layer.   The inkjet image recording method according to claim 1, wherein the organic solvent has a boiling point of 150 ° C. or more and 250 ° C. or less. The inkjet image recording method according to claim 1 or 2 , wherein the content of the organic solvent in the ink is 1 wt% or more and 40 wt% or less. After recording an image by the ink jet image recording method, by drying the ink-jet recording sheet, and removing the organic solvent contained in the ink receiving layer, according to claim 1 to 3 An inkjet image recording method according to any one of the above. The inkjet image recording method according to any one of claims 1 to 4 , wherein the inkjet image recording method is used to form at least a high-definition pattern of a color filter or an electrode circuit for a display device. .