JP2014046586A - Base material for ink jet printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base material for ink jet printing capable of reducing color mixture between pixels in ink jet printing and enabling a color filter for a display excellent in pixel form accuracy and pixel concentration uniformity to be manufactured.SOLUTION: A base material for ink jet printing contains a transparent substrate 1 and an image-receiving layer 2 containing an acrylic copolymer formed on one side of the transparent substrate, and the acrylic copolymer contains 1 to 10 wt.% of a structural unit monomer represented by general formula (1) or (2) based on a solid part of the image-receiving layer. CH=CR-COO-(CHO)-OC-CR=CH(1), where n is a natural number of 3 to 15, Rand Rare each same or different and are each either H or CH. CH=CR-COO-(CHO)-OC-CR=CH(2), where n is a natural number of 3 to 12, Rand Rare each same or different and are each either H or CH.

Description

  The present invention relates to a substrate for inkjet printing. The present invention is particularly suitable for color filters for display displays used in liquid crystal, organic and inorganic EL, electronic paper, and the like, and relates to a substrate for inkjet printing particularly suitable for color filters for electronic paper.

  The ink jet printing method is a printing technique represented by a printer which is a peripheral device of a personal computer, but in recent years, application development in industrial applications in various fields is expected. As advantages of the ink jet printing method, there are mainly the following four points. First, since a necessary amount can be pattern-printed on a necessary portion, that is, on-demand printing, the consumption of materials is minimized, and the burden on the environment is extremely small. Second, since data created by a personal computer or the like can be directly printed, indirect members such as masks and plates are not required, and costs can be reduced and processes can be shortened. Third, since the steps such as development and etching are not required, the characteristics of the material are not deteriorated due to chemical influence. Fourth, since non-contact printing is performed, the original plate or the like does not contact and damage the substrate.

  In the display, color filters are used for purposes such as color display, reflectance reduction, contrast improvement, and spectral characteristic control. The color filter used for this display has a plurality of fine colored pixels. As a method for forming fine colored pixels, methods that have been put into practical use include a photolithography method and a printing method.

  For example, the photolithography method is a method of forming a colored pattern by repeatedly performing a coating-pattern exposure-development-thermosetting process in this order. Although the method is excellent in quality, the manufacturing process is long and the manufacturing equipment is large. In addition, when performing the pattern exposure process, a photomask corresponding to each pattern is required, and since other parts than the pattern are removed in the development process, the cost of using the material is low. Get higher.

  In addition, the printing method can shorten the process compared to the photolithography method, but the cost is high because a plate corresponding to each pattern is required.

  Against this background, many techniques for applying the inkjet printing method to the production of color filters have been proposed. Since the color filter is a member for display, transparency is essential, and glass or a film is used as the substrate. However, since it is difficult to form pixels directly on these substrates by ink jet printing, generally a partition wall or an image receiving layer is provided.

  In the method of providing partition walls, mainly in a color filter for liquid crystal, a black matrix between pixels is used as partition walls, and ink is applied to openings between the pixels to form pixels. On the other hand, in the method of providing an image receiving layer, a transparent resin layer that absorbs the solvent in the ink is provided, and ink is applied thereon to form pixels.

  Here, the color filter for electronic paper generally does not provide a light-shielding film for improving contrast (improving whiteness). Therefore, it is difficult to provide the partition wall described above, and the method is to provide the image receiving layer.

  Many techniques relating to the above-described image receiving layer have been proposed. For example, Patent Documents 1 to 5 propose an image receiving layer that controls ink absorbency by light irradiation. However, in such a method, an exposure mask is required as an indirect member, and there is a concern that the advantages of ink jet printing cannot be fully demonstrated in terms of cost.

  On the other hand, Patent Documents 6 to 7 propose an image receiving layer that uses a curable resin composition and is directly formed without the pretreatment as described above. Since there is a light-shielding film below the image receiving layer, even if color mixture occurs at the edge of the pixel, there is almost no problem on display. However, in the color filter for electronic paper that does not have a light-shielding film, When color mixing occurs at the edges, display problems are inevitable.

Japanese Patent Application Laid-Open No. 08-075917 Japanese Patent Laid-Open No. 08-136726 Japanese Patent Laid-Open No. 10-104607 JP-A-10-148708 JP-A-11-109121 JP 2001-066413 A JP 2002-286925 A

  The subject of this invention is providing the base material for inkjet printing which can reduce the color mixture between pixels by inkjet printing, and can manufacture the color filter for display displays excellent in pixel shape precision and pixel density uniformity.

An inkjet printing base material comprising a transparent substrate and an image receiving layer made of an acrylic copolymer formed on one surface of the transparent substrate, and the acrylic copolymer is represented by the following general formula (1) or ( The structural unit monomer represented by 2) is contained in an amount of 1 to 10% by weight based on the solid content of the image receiving layer.
_{CH 2 = CR 1 -COO- (C} 2 H 4 O) n -OC-CR 2 = CH 2 (1)
Here, n represents a natural number of 3 to 15, and R ₁ and R ₂ are the same or different and represent either H or CH ₃ .
_{CH 2 = CR 3 -COO- (C} 3 H 6 O) n -OC-CR 4 = CH 2 (2)
Here, n represents a natural number of 3 to 12, and R ₃ and R ₄ are the same or different and represent either H or CH ₃ .

  Moreover, it is preferable that the film thickness of an image receiving layer is 5-20 micrometers, and the transparency of an image receiving layer is 90% or more of total light transmittance, and haze 0.5 or less.

  The above-mentioned ink-jet printing base material is a colored ink used for forming colored pixels, and the solvent of the colored ink contains 70% by weight or more of a solvent having a boiling point of 150 ° C. or higher and 250 ° C. or lower. preferable.

  Further, the contact angle of the surface of the image receiving layer with respect to the solvent of the above-described colored ink is preferably 30 to 60 °.

  Moreover, the color filter of this invention is equipped with the above-mentioned base material for inkjet printing.

  ADVANTAGE OF THE INVENTION According to this invention, the base material for inkjet printing which can reduce the color mixture between pixels and can manufacture the color filter for display displays excellent in pixel shape precision and pixel density uniformity can be provided.

(A) Sectional drawing which shows the processing state in the manufacturing process of the color filter for display displays which concerns on embodiment (b) Sectional drawing which shows the processing state in the manufacturing process following Fig.1 (a) (c) FIG.1 (b) ) Cross-sectional view showing the processing state in the manufacturing process following

  Hereinafter, the best mode for carrying out the present invention will be described in detail.

  First, an example of a method for manufacturing the color filter 6 according to this embodiment will be described. 1A to 1C are cross-sectional views showing a processed state in the manufacturing process of the color filter 6 according to this embodiment. As shown in FIG. 1A, a transparent substrate 1 is prepared. Next, as shown in FIG. 1B, an image receiving layer 2 having a desired thickness made of an acrylic copolymer is formed on the upper surface of the transparent substrate 1. Next, as shown in FIG. 1C, a red pixel 3, a green pixel 4, and a blue pixel 5 are formed at a predetermined position on the upper surface of the transparent substrate 1 on which the image receiving layer 2 is formed by an inkjet method. The color filter 6 for display display is obtained.

  Moreover, after forming the red pixel 3, the green pixel 4, and the blue pixel 5, it is preferable to perform the hardening process by energy, such as a heat | fever, light, an electron beam, for the purpose of the tolerance improvement. For example, a method in which a reactive substituent is introduced into the component of the image receiving layer 2 and is cured by using a curing agent such as epoxy or isocyanate can be employed.

  Next, the transparent substrate 1 will be described. As the transparent substrate 1, a resin film having sufficient strength, flatness, heat resistance, light transmittance, flexibility, and the like can be preferably used. For example, polyethylene terephthalate, polyethylene naphthalate, polymethyl methacrylate, polycarbonate, polysulfone, polyethersulfone, polycycloolefin, acrylic crosslinkable resin, epoxy crosslinkable resin crosslinkable resin, unsaturated polyester crosslinkable resin, etc. It is preferable to use a film substrate. In addition, since the linear expansion coefficient can be reduced, it is more preferable to use a composite of a resin and an inorganic substance.

Next, the image receiving layer 2 will be described. As a structural unit of the acrylic copolymer constituting the image receiving layer 2, the monomer of the structural unit represented by the following general formula (1) or (2) is contained in an amount of 1 to 10% by weight based on the solid content of the image receiving layer 2. In this case, the colored ink is sprayed by ink jet printing to form the red pixel 3, the green pixel 4, and the blue pixel 5, so that there is no color mixture between the pixels and the color filter has excellent shape stability and color material fixing property. 6 can be obtained. This is because the diacrylate of the following general formula (1) or (2) is copolymerized, and a part of the structure of the image receiving layer 2 is three-dimensionally cross-linked, so that the film strength is maintained while maintaining the absorbability of the ink solvent. By ensuring the above, shape stability and color material fixing properties are expressed in a well-balanced manner. When the addition amount of the monomer of the structural unit represented by the following general formula (1) or (2) is 1% by weight or less, the effect of the three-dimensional crosslinking is poor, and the behavior of dissolving in the solvent becomes remarkable, and between pixels As a result, the shape stability is significantly reduced. Further, when the addition amount of the monomer of the structural unit represented by the following general formula (1) or (2) is 10% or more, it is gelled at the stage of polymer synthesis along with the increase of the three-dimensional cross-linked portion, and the image receiving layer 2 It becomes difficult to form a film.
_{CH 2 = CR 1 -COO- (C} 2 H 4 O) n -OC-CR 2 = CH 2 (1)
Here, n represents a natural number of 3 to 15, and R ₁ and R ₂ are the same or different and represent either H or CH ₃ .
_{CH 2 = CR 3 -COO- (C} 3 H 6 O) n -OC-CR 4 = CH 2 (2)
Here, n represents a natural number of 3 to 12, and R ₃ and R ₄ are the same or different and represent either H or CH ₃ .

  Examples of the monomer used in the acrylic copolymer constituting the image receiving layer 2 include methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, methoxydiethylene glycol methacrylate, methoxypolyethylene glycol methacrylate, 2-hydroxyethyl methacrylate, 2- Examples include hydroxypropyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxybutyl methacrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, and methacrylic acid. An acrylic copolymer can be obtained.

  The image-receiving layer 2 forming coating liquid is mainly composed of a resin, and is composed of a solvent, and if necessary, organic and inorganic fine particles. Further, the coating liquid for forming the image receiving layer 2 is required to have performance such as being transparent, excellent in the fixing property of the coloring material in the printed ink, no discoloration or fading, and various resistances. The

  Examples of the coating solution for forming the image receiving layer 2 include water, ethanol, isopropyl alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, toluene, xylene, ethyl cellosolve, ethyl cellosolve acetate, diclime, and cyclohexanone. Alternatively, a solvent system that can be dried at a temperature equal to or lower than the minimum film-forming temperature of the emulsion using a 10 to 50% by weight solution using two or more kinds of mixed solvents as a coating solution is preferable.

  Furthermore, in the coating liquid for forming the image receiving layer 2, other resins other than those described above, or surfactants, ultraviolet absorbers, antioxidants, pH adjusting agents, antifoaming agents, and other additives are added depending on the purpose. You may mix suitably in the range which does not deviate from performance.

  In addition, the thickness of the image receiving layer 2 is about 5-20 micrometers normally, Preferably it is about 5-10 micrometers. When the film thickness is 5 μm or less, the ink stability is insufficient and the shape stability and the color material fixing property are remarkably deteriorated. On the other hand, if it is 20 μm or more, the shape stability and the color material fixing property are not affected, but the ink solvent penetrates into the image receiving layer 2, so that the drying property is remarkably lowered.

  Further, the transparency of the image receiving layer 2 is preferably 90% or more and a haze of 0.5% or less. If the transparency of the image receiving layer 2 is smaller than 90% of the total light transmittance and larger than 0.5% of haze, the color reproduction range and contrast of the display display are greatly lowered.

  The image-receiving layer 2 is formed by applying a coating liquid obtained by mixing the main agent and the curing agent at an appropriate equivalent ratio onto at least one surface of the transparent substrate 1 such as gravure coating, roll coating, and wire bar coating. What is necessary is just to apply by employ | adopting a means.

  Next, the color ink used for forming the red pixel 3, the green pixel 4, and the blue pixel 5 will be described. The colored ink is composed of a color pigment, a resin, a dispersant, a solvent, and the like.

  Examples of the color pigment include 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. However, the color pigment is not limited to these. Furthermore, two or more kinds of color pigments may be mixed and used in order to obtain a desired hue.

  The solvent type used for the colored ink is preferably an appropriate surface tension range of 35 mN / m or less in ink jet printing. Moreover, it is preferable to contain 70 wt% or more of a solvent having a boiling point of 150 ° C or higher and 250 ° C or lower. When the surface tension is 35 mN / m or more, the dot shape stability at the time of inkjet discharge is significantly adversely affected. If the solvent has a boiling point of 150 ° C. or less in excess of 30% by weight, the drying property in the vicinity of the nozzle is remarkably increased, and as a result, defects such as nozzle clogging are caused, which is not preferable. In addition, it is not preferable that the solvent having a boiling point of 250 ° C. or more is more than 30% by weight because the drying property after forming pixels on the image receiving layer 2 is remarkably lowered. Solvent types used in the colored ink include, for example, ethylene glycol, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether, ethylene glycol dibutyl ether, ethylene glycol monobutyl ether acetate, ethylene glycol isoamyl ether, ethylene glycol monophenyl ether, ethylene Glycol monohexyl ether, methoxymethoxyethanol, ethylene glycol monoacetate, ethylene glycol diacetate, diethylene glycol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether, diethylene glycol monobutyl Ether acetate, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol monoacetate, triethylene glycol monomethyl ether, propylene glycol, propylene glycol monobutyl ether, propylene glycol monoacetate, dipropylene glycol, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, Examples include tripropylene glycol monomethyl ether. However, the solvent type used for the colored ink is not particularly limited as long as it satisfies the above requirements. Moreover, you may mix and use 2 or more types of solvents as needed.

  In addition, it is preferable that the contact angle of the film of the image receiving layer 2 with respect to the solvent in colored ink is 30-60 degrees. When the contact angle is 30 to 60 °, the shape stability during pixel formation is excellent. If the contact angle is smaller than 30 °, shape control becomes difficult. On the other hand, when the contact angle is larger than 60 °, there is a possibility that pigment aggregation occurs due to a decrease in the absorption rate.

  Examples of the colored ink resin include casein, gelatin, polyvinyl alcohol, carboxymethyl acetal, polyimide resin, acrylic resin, epoxy resin, melanin resin, and the like. can do. When heat resistance and light resistance are required, it is preferable to use an acrylic resin.

  Further, a dispersant may be used in order to improve the dispersion of the pigment in the resin. Examples of the nonionic surfactant used as the dispersant include polyoxyethylene alkyl ether. Examples of the ionic surfactant used as the dispersant include sodium alkylbenzene sulfonate, poly fatty acid salt, fatty acid salt alkyl phosphate, tetraalkyl ammonium salt, organic pigment derivative, and polyester. One type of dispersant may be used alone, or two or more types of dispersants may be mixed and used. As the solvent, in addition to solubility, stability over time, drying property, and the like are required, and the solvent can be appropriately selected and used in relation to the dye and the resin.

  Next, the ink jet apparatus will be described. As an inkjet apparatus to be used, for example, there are a piezo conversion method and a heat conversion method depending on a difference in ink ejection method, and the piezo conversion method is particularly preferable. The ink particleization frequency is preferably about 1 to 100 KHz, the nozzle diameter is preferably about 5 to 80 μm, and an apparatus in which three heads are arranged and 100 to 500 nozzles are incorporated in one head is preferable. Moreover, you may perform the drying process of heating at the temperature of 100 degrees C or less after formation of the pixel of each color as needed.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

<Example 1>
(Formation of image receiving layer)
In a four-necked flask equipped with a stirrer, a nitrogen introducing tube and a reflux condenser, 60 parts of methyl methacrylate, 20 parts of methacrylic acid amide, 15 parts of 2-hydroxyethyl methacrylate, polyethylene glycol dimethacrylate (the following general In formula (1), n = 4, R ₁ and R ₂ represent CH ₃ ), 5 parts of isopropyl alcohol, and 240 parts of isopropyl alcohol and 160 parts of methyl ethyl ketone are added and dissolved uniformly. Stir under atmosphere. Polymerization was started by adding 0.5 g of α, α′-azobisisobutyronitrile to this, and the mixture was heated and stirred on an oil bath at 60 ° C. for 6 hours to obtain a colorless and viscous polymer solution. Got. This polymer solution was applied on a PEN film substrate with an applicator so as to have a film thickness of 10 μm and dried at 80 ° C. for 5 minutes to form an image receiving layer.
_{CH 2 = CR 1 -COO- (C} 2 H 4 O) n -OC-CR 2 = CH 2 (1)

(Preparation of colored ink)
5 parts of colored pigment, 5 parts of melamine resin, 50 parts of ethylene glycol monoethyl ether acetate and 40 parts of propylene glycol monoacetate were kneaded to prepare red, green and blue colored inks.

(Formation of color filter)
On the film substrate on which the image receiving layer is applied and formed as described above, the pixel size is set to 170 μm square by an ink jet printing apparatus using each of the colored inks adjusted as described above and mounting a 12 pl, 180 dpi head (manufactured by Seiko Instruments Inc.). After forming pixels of each color, it was dried at 80 ° C. for 5 minutes to form a color filter.

<Example 2>
(Formation of image receiving layer)
In a four-necked flask equipped with a stirrer, a nitrogen introducing tube and a reflux condenser, 60 parts of methyl methacrylate, 20 parts of methacrylic acid amide, 10 parts of 2-hydroxyethyl methacrylate, polyethylene glycol dimethacrylate (the following general In Formula (1), n = 4, R ₁ and R ₂ represent CH ₃ ), and 10 parts of isopropyl alcohol and 160 parts of methyl ethyl ketone are added and dissolved uniformly. Stir under atmosphere. Polymerization was started by adding 0.5 g of α, α′-azobisisobutyronitrile to this, and the mixture was heated and stirred on an oil bath at 60 ° C. for 6 hours to obtain a colorless and viscous polymer solution. Got. This polymer solution was applied on a PEN film substrate with an applicator so as to have a film thickness of 10 μm and dried at 80 ° C. for 5 minutes to form an image receiving layer.
_{CH 2 = CR 1 -COO- (C} 2 H 4 O) n -OC-CR 2 = CH 2 (1)

  Preparation of the colored ink and formation of the color filter were performed in the same manner as in Example 1.

<Example 3>
(Formation of image receiving layer)
In a four-necked flask equipped with a stirrer, a nitrogen introducing tube and a reflux condenser, 60 parts of methyl methacrylate, 20 parts of methacrylic acid amide, 15 parts of 2-hydroxyethyl methacrylate, polyethylene glycol dimethacrylate (the following general formula In (1), n = 14, R ₁ and R ₂ represent CH ₃ ), 5 parts) are added, 240 parts of isopropyl alcohol and 160 parts of methyl ethyl ketone are added and uniformly dissolved, and a nitrogen atmosphere on an oil bath Stirring under. Polymerization was started by adding 0.5 g of α, α′-azobisisobutyronitrile to this, and the mixture was heated and stirred on an oil bath at 60 ° C. for 6 hours to obtain a colorless and viscous polymer solution. Got. This polymer solution was applied on a PEN film substrate with an applicator so as to have a film thickness of 10 μm and dried at 80 ° C. for 5 minutes to form an image receiving layer.
_{CH 2 = CR 1 -COO- (C} 2 H 4 O) n -OC-CR 2 = CH 2 (1)

  Preparation of the colored ink and formation of the color filter were performed in the same manner as in Example 1.

<Example 4>
(Formation of image receiving layer)
In a four-necked flask equipped with a stirrer, a nitrogen introducing tube and a reflux condenser, 60 parts of methyl methacrylate, 20 parts of methacrylic acid amide, 10 parts of 2-hydroxyethyl methacrylate, polyethylene glycol dimethacrylate (the following general In formula (1), n = 14, R ₁ and R ₂ represent CH ₃ ), and 10 parts of isopropyl alcohol and 160 parts of methyl ethyl ketone are added and dissolved uniformly. Stir under atmosphere. Polymerization was started by adding 0.5 g of α, α′-azobisisobutyronitrile to this, and the mixture was heated and stirred on an oil bath at 60 ° C. for 6 hours to obtain a colorless and viscous polymer solution. Got. This polymer solution was applied on a PEN film substrate with an applicator so as to have a film thickness of 10 μm and dried at 80 ° C. for 5 minutes to form an image receiving layer.
_{CH 2 = CR 1 -COO- (C} 2 H 4 O) n -OC-CR 2 = CH 2 (1)

  Preparation of the colored ink and formation of the color filter were performed in the same manner as in Example 1.

<Example 5>
(Formation of image receiving layer)
In a four-necked flask equipped with a stirrer, a nitrogen inlet tube and a reflux condenser, 60 parts of methyl methacrylate, 20 parts of methacrylic acid amide, 15 parts of 2-hydroxyethyl methacrylate, polypropylene glycol dimethacrylate (the following general In formula (2), n = 3, R ₃ and R ₄ represent CH ₃ ) and 5 parts of isopropyl alcohol and 160 parts of methyl ethyl ketone are added and dissolved uniformly. Stir under atmosphere. Polymerization was started by adding 0.5 g of α, α′-azobisisobutyronitrile to this, and the mixture was heated and stirred on an oil bath at 60 ° C. for 6 hours to obtain a colorless and viscous polymer solution. Got. This polymer solution was applied on a PEN film substrate with an applicator so as to have a film thickness of 10 μm and dried at 80 ° C. for 5 minutes to form an image receiving layer.
_{CH 2 = CR 3 -COO- (C} 3 H 6 O) n -OC-CR 4 = CH 2 (2)

  Preparation of the colored ink and formation of the color filter were performed in the same manner as in Example 1.

<Example 6>
(Formation of image receiving layer)
In a four-necked flask equipped with a stirrer, a nitrogen inlet tube and a reflux condenser, 60 parts of methyl methacrylate, 20 parts of methacrylic acid amide, 10 parts of 2-hydroxyethyl methacrylate, polypropylene glycol dimethacrylate (the following general In Formula (2), n = 3, R ₃ and R ₄ represent CH ₃ ), and 10 parts of isopropyl alcohol and 160 parts of methyl ethyl ketone are added and dissolved uniformly. Stir under atmosphere. Polymerization was started by adding 0.5 g of α, α′-azobisisobutyronitrile to this, and the mixture was heated and stirred on an oil bath at 60 ° C. for 6 hours to obtain a colorless and viscous polymer solution. Got. This polymer solution was applied on a PEN film substrate with an applicator so as to have a film thickness of 10 μm and dried at 80 ° C. for 5 minutes to form an image receiving layer.
_{CH 2 = CR 3 -COO- (C} 3 H 6 O) n -OC-CR 4 = CH 2 (2)

  Preparation of the colored ink and formation of the color filter were performed in the same manner as in Example 1.

<Example 7>
(Formation of image receiving layer)
In a four-necked flask equipped with a stirrer, a nitrogen inlet tube and a reflux condenser, 60 parts of methyl methacrylate, 20 parts of methacrylic acid amide, 15 parts of 2-hydroxyethyl methacrylate, polypropylene glycol dimethacrylate (the following general In formula (2), n = 12, R ₃ and R ₄ represent CH ₃ ), and 240 parts of isopropyl alcohol and 160 parts of methyl ethyl ketone are added and uniformly dissolved. Stir under atmosphere. Polymerization was started by adding 0.5 g of α, α′-azobisisobutyronitrile to this, and the mixture was heated and stirred on an oil bath at 60 ° C. for 6 hours to obtain a colorless and viscous polymer solution. Got. This polymer solution was applied on a PEN film substrate with an applicator so as to have a film thickness of 10 μm and dried at 80 ° C. for 5 minutes to form an image receiving layer.
_{CH 2 = CR 3 -COO- (C} 3 H 6 O) n -OC-CR 4 = CH 2 (2)

  Preparation of the colored ink and formation of the color filter were performed in the same manner as in Example 1.

<Example 8>
(Formation of image receiving layer)
In a four-necked flask equipped with a stirrer, a nitrogen inlet tube and a reflux condenser, 60 parts of methyl methacrylate, 20 parts of methacrylic acid amide, 10 parts of 2-hydroxyethyl methacrylate, polypropylene glycol dimethacrylate (the following general In formula (2), n = 12, R ₃ and R ₄ represent CH ₃ ), 10 parts of isopropyl alcohol and 240 parts of isopropyl alcohol and 160 parts of methyl ethyl ketone are added and dissolved uniformly. Stir under atmosphere. Polymerization was started by adding 0.5 g of α, α′-azobisisobutyronitrile to this, and the mixture was heated and stirred on an oil bath at 60 ° C. for 6 hours to obtain a colorless and viscous polymer solution. Got. This polymer solution was applied on a PEN film substrate with an applicator so as to have a film thickness of 10 μm and dried at 80 ° C. for 5 minutes to form an image receiving layer.
_{CH 2 = CR 3 -COO- (C} 3 H 6 O) n -OC-CR 4 = CH 2 (2)

  Preparation of the colored ink and formation of the color filter were performed in the same manner as in Example 1.

<Comparative Example 1>
(Formation of image receiving layer)
In a four-necked flask equipped with a stirrer, a nitrogen introducing tube and a reflux condenser, 60 parts of methyl methacrylate, 20 parts of methacrylic acid amide, 15 parts of 2-hydroxyethyl methacrylate, polyethylene glycol dimethacrylate (the following general In formula (1), n = 1, R ₁ and R ₂ represent CH ₃ ), and 240 parts of isopropyl alcohol and 160 parts of methyl ethyl ketone are added and uniformly dissolved. Stir under atmosphere. Polymerization was started by adding 0.5 g of α, α′-azobisisobutyronitrile to this, and the mixture was heated and stirred on an oil bath at 60 ° C. for 6 hours to obtain a colorless and viscous polymer solution. Got. This polymer solution was applied on a PEN film substrate with an applicator so as to have a film thickness of 10 μm and dried at 80 ° C. for 5 minutes to form an image receiving layer.
_{CH 2 = CR 1 -COO- (C} 2 H 4 O) n -OC-CR 2 = CH 2 (1)

  Preparation of the colored ink and formation of the color filter were performed in the same manner as in Example 1.

<Comparative example 2>
(Formation of image receiving layer)
In a four-necked flask equipped with a stirrer, a nitrogen introducing tube and a reflux condenser, 60 parts of methyl methacrylate, 20 parts of methacrylic acid amide, 15 parts of 2-hydroxyethyl methacrylate, polyethylene glycol dimethacrylate (the following general In formula (1), n = 23, R ₁ and R ₂ represent CH ₃ ) and 5 parts of isopropyl alcohol and 240 parts of isopropyl alcohol and 160 parts of methyl ethyl ketone are added and dissolved uniformly. Stir under atmosphere. Polymerization was started by adding 0.5 g of α, α′-azobisisobutyronitrile to this, and the mixture was heated and stirred on an oil bath at 60 ° C. for 6 hours to obtain a colorless and viscous polymer solution. Got. This polymer solution was applied on a PEN film substrate with an applicator so as to have a film thickness of 10 μm and dried at 80 ° C. for 5 minutes to form an image receiving layer.
_{CH 2 = CR 1 -COO- (C} 2 H 4 O) n -OC-CR 2 = CH 2 (1)

  Preparation of the colored ink and formation of the color filter were performed in the same manner as in Example 1.

<Comparative Example 3>
(Formation of image receiving layer)
In a four-necked flask equipped with a stirrer, a nitrogen inlet tube and a reflux condenser, 60 parts of methyl methacrylate, 15 parts of methacrylic acid amide, 10 parts of 2-hydroxyethyl methacrylate, polyethylene glycol dimethacrylate (the following general In formula (1), n = 4, R ₁ and R ₂ represent CH ₃ ), 15 parts are introduced, 240 parts of isopropyl alcohol and 160 parts of methyl ethyl ketone are added and uniformly dissolved, Stir under atmosphere. Polymerization was started by adding 0.5 g of α, α′-azobisisobutyronitrile to this, and the mixture was heated and stirred on an oil bath at 60 ° C. for 6 hours to obtain a colorless and viscous polymer solution. Got. This polymer solution was applied on a PEN film substrate with an applicator so as to have a film thickness of 10 μm and dried at 80 ° C. for 5 minutes to form an image receiving layer.
_{CH 2 = CR 1 -COO- (C} 2 H 4 O) n -OC-CR 2 = CH 2 (1)

  Preparation of the colored ink and formation of the color filter were performed in the same manner as in Example 1.

<Comparative Example 4>
(Formation of image receiving layer)
Into a four-necked flask equipped with a stirrer, a nitrogen introduction tube and a reflux condenser, 60 parts of methyl methacrylate, 20 parts of methacrylic acid amide and 20 parts of 2-hydroxyethyl methacrylate are introduced, and 240 parts of isopropyl alcohol are further introduced. And 160 parts of methyl ethyl ketone were added and dissolved uniformly, and the mixture was stirred on an oil bath in a nitrogen atmosphere. Polymerization was started by adding 0.5 g of α, α′-azobisisobutyronitrile to this, and the mixture was heated and stirred on an oil bath at 60 ° C. for 6 hours to obtain a colorless and viscous polymer solution. Got. This polymer solution was applied on a PEN film substrate with an applicator so as to have a film thickness of 10 μm and dried at 80 ° C. for 5 minutes to form an image receiving layer.

  Preparation of the colored ink and formation of the color filter were performed in the same manner as in Example 1.

<Comparative Example 5>
(Preparation of colored ink)
5 parts of colored pigment, 5 parts of melamine resin, and 90 parts of propylene glycol monomethyl ether were kneaded to prepare red, green, and blue colored inks.

  The image receiving layer and the color filter were formed in the same manner as in Example 1.

<Comparative Example 6>
(Preparation of colored ink)
5 parts of colored pigment, 5 parts of melamine resin, and 90 parts of diethylene glycol dibutyl ether were kneaded to prepare red, green, and blue colored inks.

  The image receiving layer and the color filter were formed in the same manner as in Example 1.

  Table 1 shows the characteristics of the color filters described in Examples 1 to 8 and Comparative Examples 1 to 6.

  The details of the evaluation method in Table 1 are shown below.

<Transparency>
The transparency of the image receiving layer coating was measured and evaluated according to the following criteria.
○: Light transmittance of 90% or more and haze of 0.5 or less ×: Other than the above

<Contact angle>
The contact angle of the image-receiving layer coating with the colored ink solvent component was measured and evaluated according to the following criteria.
○: Contact angle 30-60 ° of image-receiving layer coating with colored ink solvent component
×: Other than above

<Pixel quality>
The size of each pixel was measured and evaluated according to the following criteria.
◯: Both X and Y are 170 ± 20 μm, and there is no visual pigment aggregation ×: Other than the above

  As described above, in the color filters of Examples 1 to 8, compared to the color filters of Comparative Examples 1 to 6, the shape stability at the time of pixel formation is excellent, the pixel quality is high, and the color mixture of pixels does not occur. confirmed.

The substrate for inkjet printing of the present invention is useful for color filters used in display displays such as liquid crystal displays, electronic paper, organic and inorganic EL.

DESCRIPTION OF SYMBOLS 1 Transparent substrate 2 Image receiving layer 3 Red pixel 4 Green pixel 5 Blue pixel 6 Color filter

Claims (5)

A substrate for inkjet printing,
A transparent substrate;
An image receiving layer made of an acrylic copolymer formed on one surface of the transparent substrate,
The acrylic copolymer contains 1 to 10% by weight of a structural unit monomer represented by the following general formula (1) or (2) based on the solid content of the image receiving layer. Substrate for use.
_{CH 2 = CR 1 -COO- (C} 2 H 4 O) n -OC-CR 2 = CH 2 (1)
Here, n represents a natural number of 3 to 15, and R ₁ and R ₂ are the same or different and represent either H or CH ₃ .
_{CH 2 = CR 3 -COO- (C} 3 H 6 O) n -OC-CR 4 = CH 2 (2)
Here, n represents a natural number of 3 to 12, and R ₃ and R ₄ are the same or different and represent either H or CH ₃ .   2. The ink jet printing according to claim 1, wherein the image receiving layer has a thickness of 5 to 20 μm, and the transparency of the image receiving layer is 90% or more of total light transmittance and 0.5 or less of haze. Base material. A colored ink used for forming colored pixels on the inkjet printing substrate according to claim 1,
The colored ink contains 70 wt% or more of a solvent having a boiling point of 150 ° C. or higher and 250 ° C. or lower.   The substrate for inkjet printing according to any one of claims 1 to 2, wherein a contact angle of the surface of the image receiving layer with respect to the solvent of the colored ink according to claim 3 is 30 to 60 °.   A color filter comprising the ink jet printing substrate according to claim 1.