JPWO2007113958A1 - Ink-jet ink for color filter, color filter, method for producing color filter, and display device - Google Patents

Abstract

The present invention is obtained by drying for 8 hours under the conditions of 5 mmHg (0.67 kPa) and 45 ° C. with a colorant, an organic solvent and a monomer having at least two polymerizable groups and an average thickness of 1 mm. Ink jet ink for color filter, wherein viscosity of ink residue obtained is 40 mPa · s or more and 4000 mPa · s or less at 25 ° C., method for producing color filter using this ink, and color obtained by this production method Provided are a filter and a display device including the color filter.

Description

  The present invention relates to an inkjet ink for a color filter, a method for producing a color filter using the ink, a color filter obtained by the production method, and a display device including the color filter.

  In recent years, with the development of personal computers, particularly large-screen liquid crystal televisions, the demand for liquid crystal displays, especially color liquid crystal displays, has been increasing. However, since color liquid crystal displays are expensive, there is an increasing demand for cost reduction. In particular, there is a high demand for cost reduction for color filters with high specific gravity.

  Such a color filter usually includes a coloring pattern of three primary colors of red (R), green (G), and blue (B). In a liquid crystal display provided with this color filter, the liquid crystal operates as a shutter by turning on and off the electrodes corresponding to the R, G, and B pixels, and the R, G, and B pixels are illuminated with light. Passes and color display is performed.

  As a conventional method for producing a color filter, for example, a staining method can be mentioned. In this dyeing method, first, a water-soluble polymer material, which is a dyeing material, is formed on a glass substrate, patterned into a desired shape by a photolithography process, and then the obtained pattern is immersed in a dyeing bath. To get a colored pattern. By repeating this three times, R, G, and B color filter layers are formed.

  Another method is a pigment dispersion method. In this method, a photosensitive resin layer in which a pigment is dispersed is first formed on a substrate, and this is patterned to obtain a monochromatic pattern. Further, this process is repeated three times to form R, G, and B color filter layers.

  Still other methods include an electrodeposition method, a method in which a pigment is dispersed in a thermosetting resin, R, G, and B are printed three times, and then the resin is thermoset.

  However, in any method, in order to color three colors of R, G, and B, it is necessary to repeat the same process three times, which causes a problem that the cost is high, and the yield decreases because the same process is repeated. There is a problem of doing.

  As a method of manufacturing a color filter that solves these problems, a method of forming a colored layer (pixel portion) by spraying colored ink by an inkjet method has been proposed (Patent Document 1). Here, when ink having good wettability with respect to the glass substrate is used, a method of printing a convex portion that is a boundary in advance with a substance with poor wettability with respect to the ink, or poor wettability with respect to the glass. In the case of using ink, a method is disclosed in which a pattern is formed in advance with a material having good wettability with ink, and the ink is fixed. However, controlling the glass substrate and the convex portion that forms the boundary to have ink affinity and ink repellency is effective in controlling color mixing between pixels and ink wettability, but the shape of the pixel portion itself is convex. There is a problem that the flatness of the pixel portion cannot be obtained due to the shape or the concave shape. In such a case, there arises a problem that the color density in the pixel varies and the display quality of the image is remarkably deteriorated.

  Patent Document 2 discloses a method for obtaining a flatness of a pixel portion by providing a flattening layer in the pixel portion. The above document describes a method of exposing from the substrate side, adjusting the degree of curing of the planarization layer according to the thickness of the pixel portion, and imparting flatness, but regarding variations in color density within the pixel portion, Nothing has been resolved. Patent Document 3 discloses a method of forming a film-like protective layer by transfer, but similarly, variations in color density in the pixel portion are not eliminated.

  Patent Document 4 discloses an ink having a color pigment and an extender pigment as an ink that imparts flatness to a pixel portion. In the above-mentioned document, the weight ratio between the resin and the pigment, the weight ratio between the colored pigment and the extender pigment, and the solid content in the ink are also mentioned. However, when the present inventors made an additional examination of the above document, it was found that sufficient flatness could not be obtained. Patent Document 5 discloses a method of imparting flatness while adjusting the density in the pixel portion using dark and light inks. However, the process becomes complicated and sufficient flatness cannot be obtained.

  Moreover, a method for obtaining flatness by controlling the dry state of the pixel portion is disclosed (Patent Documents 6, 7, and 8). Patent Document 6 describes that the flatness of the pixel portion can be obtained by exposing the ink before drying. Patent Document 7 describes a method of drying at a higher temperature as the viscosity of the ink is higher. Furthermore, Patent Document 8 describes a method of adjusting the drying condition according to the shape of the pixel. However, the methods of Patent Documents 6 and 7 do not provide sufficient flatness, and the method of Patent Document 8 is impractical when considering actual production.

  Further, Patent Documents 9 and 10 disclose a color filter in which the end of the pixel portion has a thickness of 80% or more of the highest portion, but does not disclose any means for obtaining flatness.

Furthermore, Patent Document 11 discloses a method of repeating ink ejection and drying many times in order to prevent ink from overflowing from a recess surrounded by a partition wall and mixing with other pixels. Although the above method can prevent color mixing in the pixel portion and at the same time improve the flatness of the pixel portion, the process becomes complicated and is not suitable for actual manufacturing.
JP 59-75205 A JP-A-8-304619 JP-A-10-197719 JP-A-9-132740 JP 2004-177867 A Japanese Patent Laid-Open No. 11-142641 JP 2002-372613 A JP 2003-266003 A JP 2002-148429 A JP 2002-156520 A JP 2004-325736 A

  The present invention has been made in view of the above-described conventional problems, and is excellent in color filter productivity, small flatness of the pixel portion and small variation in color density in the pixel portion, and excellent display quality without unevenness. An object of the present invention is to provide a color filter inkjet ink capable of producing a color filter, a method for producing a color filter using the ink, a color filter obtained by the production method, and a display device including the color filter.

  A first aspect of the present invention is a color filter inkjet ink containing at least a colorant, an organic solvent, and a monomer having two or more polymerizable groups, and the color filter inkjet ink has an average thickness of 1 mm. Ink for color filters, wherein the viscosity of the remaining ink obtained by drying for 8 hours under the conditions of 5 mmHg (0.67 kPa) and 45 ° C. is 40 mPa · s to 4000 mPa · s at 25 ° C. Provide ink.

  According to a second aspect of the present invention, a colored layer is formed by applying droplets of the inkjet ink for a color filter according to the first aspect of the present invention to a recess surrounded by a partition formed on a substrate by an inkjet method. A method of manufacturing a color filter is provided.

  A third aspect of the present invention provides a color filter produced by the method for producing a color filter according to the second aspect of the present invention.

  According to a fourth aspect of the present invention, there is provided a display device comprising the color filter according to the third aspect of the present invention.

  According to the present invention, an ink-jet ink for a color filter that can produce a color filter that is excellent in color filter productivity, has small pixel portion flatness, and small variations in color density in the pixel portion, and has excellent display quality without unevenness. A method for producing a color filter using the ink, a color filter obtained by the production method, and a display device including the color filter are provided.

Hereinafter, the inkjet ink for a color filter, the method for producing the color filter, the color filter, and the display device of the present invention will be described in detail.
<Inkjet ink for color filter>
The color filter ink-jet ink of the present invention (hereinafter sometimes referred to as “the ink-jet ink of the present invention”) is a color filter ink-jet that contains at least a colorant, an organic solvent, and a monomer having two or more polymerizable groups. Ink, the viscosity of the remaining ink obtained by drying the inkjet ink for a color filter with an average thickness of 1 mm under the conditions of 5 mmHg (0.67 kPa) and 45 ° C. for 8 hours has a viscosity of 40 mPa at 25 ° C. It is characterized by being s or more and 4000 mPa · s or less. The inkjet ink of the present invention may contain a dispersant, a binder, a photopolymerization initiator, a thermal polymerization initiator, a surfactant, or other additives within a range satisfying the viscosity.

(Flowability of ink remaining)
The ink-jet ink of the present invention has an organic solvent as an essential component, and the viscosity of the remaining ink obtained by drying for 8 hours under conditions of 5 mmHg (0.67 kPa) and 45 ° C. with an average thickness of 1 mm is 25 ° C. 40 mPa · s or more and 4000 mPa · s or less. Here, the average thickness is a thickness obtained by calculation from the container bottom area and the ink volume.

  The viscosity at 25 ° C. of the remaining ink is more preferably 50 mPa · s to 3000 mPa · s, further preferably 50 mPa · s to 2000 mPa · s, and more preferably 50 mPa · s to 1000 mPa · s. It is particularly preferred. When the viscosity of the remaining ink is within the above range, the pixel portion (colored layer) has fluidity even after the organic solvent is dried, so that a flat pixel portion (colored layer) can be obtained.

  The “ink remainder” in the present invention refers to a residue obtained by drying an inkjet ink for a color filter under conditions of 5 mmHg (0.67 kPa) and 45 ° C. for 8 hours with an average thickness of 1 mm. When measuring the viscosity of the remaining ink using a viscoelasticity measuring device, for example, the color filter inkjet ink is placed in an aluminum tray so that the average thickness is 1 mm, and is vacuum-dried at 45 ° C. for 8 hours (0.67 kPa). ), And the resulting residue (ink residue) can be collected from an aluminum dish using a chemical sledge and used as a sample. Viscoelasticity measurement using a viscoelasticity measuring device can be performed, for example, using a viscoelasticity measuring device DynAlyser DAS-100 manufactured by Jasco International Co. Ltd. under conditions of a temperature of 25 ° C. and a frequency of 1 Hz.

The viscosity of the remaining ink may be measured using a laser pickup method. The laser pickup method is a method of measuring the viscosity from the response speed of the surface of the pasty compound with respect to a change in electric field. As an example of the measurement method using the laser pickup method, first, a color filter inkjet ink is applied to a glass plate by a spinner and vacuum dried (0.67 kPa) at 45 ° C. for 8 hours, which is used as a measurement sample. When the remaining ink of the sample is irradiated with a strong laser beam (about 0.6 W), the sample interface is deformed by about several nm. The amount of deformation is very small, but the curvature near the center is large enough to be detected using light. Here, a double wave YAG laser is used as the pump light for inducing deformation at the sample interface, and a sufficiently weak He-Ne laser is used as the probe light for detecting the deformation. Since the probe light irradiated on the surface spreads and returns after receiving the deformation curvature of the sample surface, the deformation information of the surface can be obtained by cutting out a part of this and observing the intensity change.
When the pump light is turned on / off in a step function, the surface of the sample is lifted along with it and returns to the original flat state. Since a sample with high viscosity requires time for this deformation, the viscosity is measured from the deformation speed. Further, since the deformation amount itself is mainly determined by the surface tension, viscosity information can be obtained from a change in signal intensity.

Next, each component contained in the inkjet ink of the present invention will be described in detail.
(Coloring agent)
As the colorant used in the inkjet ink of the present invention, known pigments such as organic pigments, inorganic pigments and dyes can be used, but sufficient transmission density, light resistance, adhesion to the substrate, and other various resistances are required. Therefore, various organic pigments are suitable. Specific examples of the colorant include pigments and dyes described in JP-A-2005-17716 [0038] to [0054], pigments described in JP-A-2004-361447 [0068] to [0072] The colorants described in JP-A-2005-17521 [0080] to [0088] can be preferably used. Among these, pigments are particularly preferable from the viewpoint of storage stability of pixels.
The content of the colorant in the present invention is not particularly limited, but from the viewpoint of obtaining a desired hue and density, the proportion of the colorant in the remainder of the ink is preferably 20% by mass or more, and 20 to 70% by mass. Is more preferable, 25-60 mass% is more preferable, and 30-50 mass% is especially preferable.

In the present invention, the combination of the above-described pigments preferably used in combination is C.I. I. In pigment red 254, C.I. I. Pigment red 177, C.I. I. Pigment red 224, C.I. I. Pigment yellow 139 or C.I. I. A combination with Pigment Violet 23 is mentioned. C. I. In Pigment Green 36, C.I. I. Pigment yellow 150, C.I. I. Pigment yellow 139, C.I. I. Pigment yellow 185, C.I. I. Pigment yellow 138 or C.I. I. And a combination with Pigment Yellow 180. C. I. In Pigment Blue 15: 6, C.I. I. Pigment violet 23 or C.I. I. A combination with Pigment Blue 60 is mentioned.
C. in the pigment when used together in this way. I. Pigment red 254, C.I. I. Pigment green 36, C.I. I. The content of Pigment Blue 15: 6 is C.I. I. Pigment Red 254 is preferably 60% by mass or more, particularly preferably 70% by mass or more. C. I. The pigment green 36 is preferably 50% by mass or more, particularly preferably 60% by mass or more. C. I. Pigment Blue 15: 6 is preferably 80% by mass or more, and particularly preferably 90% by mass or more.

  The pigment used in the present invention preferably has a number average particle size of 0.001 to 0.1 μm, more preferably 0.01 to 0.08 μm. When the number average particle diameter of the pigment is 0.001 μm or more, it is preferable because the surface energy of the particles is small and aggregation is difficult, the dispersion of the pigment is facilitated, and the dispersion state is easily kept stable. Further, if the number average particle diameter of the pigment is 0.1 μm or less, it is preferable because the polarization is not canceled by the pigment and the contrast is improved. The “particle diameter” as used herein refers to the diameter when the electron micrograph image of the particle is a circle of the same area, and the “number average particle diameter” is the above-mentioned particle diameter for a number of particles, The average value of 100 is said.

  The pigment is desirably used as a dispersion. This dispersion can be prepared by dispersing a composition obtained by previously mixing the pigment, a pigment dispersant described later, and an organic solvent using a known disperser. At this time, a small amount of resin may be added in order to impart dispersion stability of the pigment. Moreover, it is also possible to prepare the composition obtained by mixing the pigment and the pigment dispersant in advance by adding to a monomer described later and dispersing it. The disperser used for dispersing the pigment is not particularly limited. For example, a kneader described in Kazuzo Asakura, “Encyclopedia of Pigments”, first edition, Asakura Shoten, 2000, page 438, Known dispersing machines such as a roll mill, an atrider, a super mill, a dissolver, a homomixer, and a sand mill can be used. Further, fine grinding may be performed using frictional force by mechanical grinding described on page 310 of the document.

(Pigment dispersant)
In order to obtain the dispersion stability of the pigment, it is preferable to add a pigment dispersant to the inkjet ink of the present invention.
The amount used is preferably 0.1 to 10% by mass, more preferably 0.1 to 9% by mass, and more preferably 0.1 to 8% by mass with respect to the total mass of the inkjet ink. A range is particularly preferred.
Examples of the pigment dispersant include a hydroxyl group-containing carboxylic acid ester, a salt of a long chain polyaminoamide and a high molecular weight acid ester, a salt of a high molecular weight polycarboxylic acid, a salt of a long chain polyaminoamide and a polar acid ester, a high molecular weight unsaturated ester, Polymer copolymer, modified polyurethane, modified polyacrylate, polyether ester type anionic activator, naphthalene sulfonic acid formalin condensate salt, aromatic sulfonic acid formalin condensate, polyoxyethylene alkyl phosphate ester, polyoxyethylene nonyl Phenyl ether, stearylamine acetate, pigment derivatives and the like can be used.

  As specific examples of the pigment dispersant, the examples described in paragraphs [0021] to [0023] of JP-A-2005-15672 can be used as preferred examples of the present invention.

(monomer)
The monomer having two or more polymerizable groups used in the inkjet ink of the present invention (hereinafter sometimes referred to as a bifunctional or higher monomer) is particularly limited as long as it can be polymerized by active energy rays and / or heat. Although not intended, a monomer having three or more polymerizable groups (hereinafter sometimes abbreviated as tri- or higher functional monomer) is more preferable from the viewpoint of film strength and solvent resistance. The proportion of the tri- or higher functional monomer in the whole monomer is preferably 20% by mass or more, and more preferably 30% by mass or more. The tri- or higher functional monomer preferably has a viscosity at 25 ° C. of 700 mPa · s or less, and more preferably 200 mPa · s or less.

The type of the polymerizable group is not particularly limited, but the viscosity of the polymerizable monomer itself is increased by increasing the number of functional groups. Therefore, it is preferable that the viscosity of the functional group itself is low, such as an acryloyloxy group, a methacryloyloxy group, Epoxy groups are particularly preferred.
Specific examples of the tri- or higher functional polymerizable monomer include a trifunctional epoxy group-containing monomer described in paragraph Nos. 0061 to 0063 of JP-A No. 2001-350012 and paragraph No. 0016 of JP-A No. 2002-371216. And trifunctional or higher acrylate monomers, methacrylate monomers, and trifunctional or higher functional monomers described in “Market Prospects of Reactive Monomers” published by CMC Publishing Co., Ltd. Among these, trimethylolpropane triacrylate, trimethylolpropane PO (propylene oxide) modified triacrylate, trimethylolpropane EO (ethylene oxide) modified triacrylate, pentaerythritol tetraacrylate, trimethylolpropane triacrylate are particularly preferable. Examples include, but are not limited to, methacrylate, pentaerythritol triacrylate, glycerol polyglycidyl ether, diglycerol polyglycidyl ether, and trimethylolpropane polyglycidyl ether. It is also possible to use two or more of the above trifunctional monomers.

  For the purpose of reducing the viscosity of the remaining ink and promoting the polymerization reaction of the pixel portion, a monofunctional monomer or a bifunctional monomer may be used in combination as appropriate. Examples of these monofunctional monomers and bifunctional monomers include monofunctional epoxy group-containing monomers described in paragraph No. [0065] of JP-A No. 2001-350012, and paragraph Nos. 0015 to of JP-A No. 2002-371216. And monofunctional or bifunctional acrylate monomers and methacrylate monomers described in 0016, and monofunctional or bifunctional monomers described in “Market Prospects of Reactive Monomers” published by CMC Publishing Co., Ltd.

  In addition, in order to supplement the strength of the film or to provide close contact with the substrate, a small amount of a high-viscosity monomer having a viscosity at 25 ° C. of 700 mPa · s or more, a highly polar monomer such as urethane acrylate, and a small amount of oligomer are used together. It doesn't matter. There is no restriction | limiting in particular as a polyfunctional monomer, a highly polar monomer, and an oligomer preferable when using together, A general purpose thing can be used. For example, dipentaerythritol hexaacrylate, isocyanuric acid EO-modified diacrylate, isocyanuric acid EO-modified triacrylate, ε-caprolactone-modified tris (acryloxyethyl) isocyanurate, urethane acrylate (for example, Allonics M-1000, manufactured by Toagosei Co., Ltd.) -1200, M-1210, M-1600), polyester acrylate (for example, Allonics M-6100, M-6200, M-6250, M-6500, M-7500, M-7100, M-7300K, M-8030, manufactured by Toa Gosei Co., Ltd.) M-8060, M-8100, M-8530, M-8560, M-9050), and the like. The amount of these combined monomers added can be adjusted as appropriate within the range where the viscosity of the remaining ink becomes 4000 mPa · s or less at 25 ° C.

  The amount of the monomer used is preferably 20% by mass or more, more preferably 30% by mass or more, and further preferably 40% by mass or more in the ink solid content. When the amount of the monomer used is 20% by mass or more, the pixel portion is sufficiently polymerized, so that scratches due to insufficient film strength of the pixel portion are less likely to occur or when a transparent conductive film is applied. Reticulation is less likely to occur, and solvent resistance when providing an alignment film is improved.

The following method can be used to adjust the viscosity of the remaining ink at 40 ° C. to 4000 mPa · s at 25 ° C.
For example, a monomer having a lower viscosity can be used as the monomer to be used. Further, as the binder component, it is possible to reduce the amount of high molecular weight or highly polar resin used and to reduce the high viscosity component in the ink. Moreover, the method of selecting the optimal dispersing agent for a pigment and reducing the viscosity of a pigment dispersion liquid is mentioned. Among these, it is particularly effective to use a monomer having a low viscosity. In order to provide the film strength of the pixel, it is preferable to use a monomer having three or more polymerizable groups.

(Organic solvent)
Examples of the organic solvent include water-soluble organic solvents such as alcohols and water-insoluble organic solvents such as esters and ethers. Water-insoluble organic solvents are preferred for the following reasons.
When the solvent is a water-soluble organic solvent, the binder or monomer to be used needs to be water-soluble. Since these water-soluble binders and monomers have polar groups, the viscosity of the remaining ink after removal of the water-soluble organic solvent tends to increase, and it becomes difficult to flatten the shape of the color filter pixel.
There are no particular restrictions on the water-insoluble organic solvent, but organic solvents that have a low boiling point and are easy to remove from the inkjet ink usually evaporate quickly on the inkjet head, making it easy to increase the viscosity of the ink on the head. In many cases, it is accompanied by deterioration of the discharge property. In order to prevent the ink from being dried in the ink jet head, it is preferable to include at least an organic solvent having a boiling point of 160 ° C. or higher at normal pressure.

  The proportion of these organic solvents in the inkjet ink of the present invention is preferably 40% by mass or more, more preferably 50% by mass or more, and further preferably 60% by mass or more. If the proportion of the organic solvent is 40% by mass or more, the amount of ink ejected in one pixel increases, so that wetting and spreading of ink in the pixel does not become insufficient, and flatness is improved.

  Moreover, it is preferable that 50 mass% or more of the organic solvent to contain the inkjet ink of this invention is a compound which has a boiling point of 160 degreeC or more at 760 mmHg (101.3 kPa). Examples of the organic solvent having a boiling point of 160 ° C. or higher at room temperature include the high boiling point solvents, alkylene glycol acetate, and alkylene glycol diacetate described in JP-A 2000-310706 [0031] to [0037]. Among these, dipropylene glycol monomethyl ether, propylene glycol diacetate, dipropylene glycol monomethyl ether acetate, propylene glycol-n-butyl ether acetate, dipropylene glycol mono-n-butyl ether, tripropylene glycol methyl ether acetate, diethylene glycol monobutyl ether, 1,3-butanediol diacetate, dipropylene glycol-n-propyl ether acetate, propylene carbonate, diethylene glycol monobutyl ether acetate, dipropylene glycol-n-butyl ether acetate and the like are particularly preferable.

  Further, the upper limit of the boiling point of the organic solvent is not particularly limited as long as the color filter can be produced by the inkjet method using the inkjet ink of the present invention, but the ink preparation process and the color filter production process are not limited. From the viewpoint of operability, an organic solvent having a boiling point of 290 ° C. or lower, preferably 280 ° C. or lower and a liquid having a relatively low viscosity at room temperature (20 ° C.) is desirable.

(Polymerization initiator)
In the inkjet ink of the present invention, a polymerization initiator may be used in combination for the purpose of promoting the polymerization reaction of the monomer. As the polymerization initiator, a photopolymerization initiator is used when the pixel portion is polymerized by active energy rays, and a thermal polymerization initiator is used when the pixel portion is polymerized by heat. Examples of the photopolymerization initiator include those described in paragraphs [0079] to [0088] of JP-A-2006-28455, and preferred specific examples include 2-trichloromethyl-5- (p-styryl). Styryl) -1,3,4-oxadiazole and 2,4-bis (trichloromethyl) -6- [4 ′-(N, N-bisethoxycarbonylmethylamino) -3′-bromophenyl] -s -Triazines are mentioned.

  As the thermal polymerization initiator, generally known organic peroxide compounds and azo compounds can be used. As a result, the strength of the pixel portion can be improved. In addition to the thermal polymerization initiator, a curing catalyst such as imidazole can also be used. The organic peroxide compound and the azo compound can be used in combination of two or more in addition to the single use. Here, the organic peroxide is a derivative of hydrogen peroxide (H—O—O—H) and refers to an organic compound having a —O—O— bond in the molecule.

  When classified by chemical structure, ketone peroxides, peroxyketals, hydroperoxides, dialkyl peroxides, diacyl peroxides, peroxyesters, peroxydicarbonates and the like can be mentioned. Specifically, 3,3 ′, 4,4′-tetra (t-butylperoxycarbonyl) benzophenone, benzoyl peroxide, 2,2-bis (4,4-di-t-butylperoxycyclohexyl) propane, 1,1-bis (t-hexylperoxy) -3,3,5-trimethylcyclohexane, t-butylperoxybenzoate, di-t-butylperoxybenzoate, di-t-butylperoxyisophthalate, t- Butyl peroxyacetate, t-hexyl peroxybenzoate, t-butyl peroxy-3,5,5-trimethylhexanoate, t-butyl peroxylaurate, t-butyl peroxyisopropyl monocarbonate, t-butyl Peroxy-2-ethylhexyl monocarbonate, 2,5-bis (m-toluyl peroxy Hexane, 2,5-dimethyl-2,5-bis (benzoyl peroxy) hexane, t-hexyl peroxy isopropyl monocarbonate,

t-butylperoxyisobutyrate, 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate, t-hexylperoxyisopropylmonocarbonate, 2,5-dimethyl-2,5-bis (2-ethylhexanoylperoxy) hexane, t-butylperoxy-2-ethylhexanoate, t-butylperoxymaleic acid, cyclohexanone peroxide, methylacetoacetate peroxide, methylhexanone peroxide, acetylacetone peroxide Oxide, 1,1-bis (t-hexylperoxy) cyclohexane, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, 1,1-bis (t-butylperoxy) -2-methylcyclohexane, 1,1-bis ( -Butylperoxy) cyclohexane, 2,2-bis (t-butylperoxy) butane, 2,2-bis (4,4-di-t-butylperoxycyclohexyl) propane, diisopropylbenzene hydroperoxide, 1, 1,3,3-tetramethylbutyl hydroperoxide, cumene hydroperoxide, t-butyl hydroperoxide and the like are preferable, such as 2,2-bis (4,4-di-t-butylperoxycyclohexyl) propane. Peroxyketal compounds, diacyl peroxide compounds such as benzoyl peroxide, and peroxyester compounds such as t-butyl peroxybenzoate are preferred.

  Examples of the azo compound include compounds described in paragraphs [0021] to [0023] of JP-A-5-5014. Among these compounds, a compound that has a decomposition temperature that is somewhat high and is stable at room temperature, is a compound that decomposes when heated to generate radicals and serves as a polymerization initiator. Among organic peroxide compounds or azo compounds (thermal polymerization initiators), those having a relatively high half-life temperature (preferably 50 ° C. or higher, more preferably 80 ° C. or higher) are used. The viscosity can be suitably configured without changing with time, and examples thereof include azobis (cyclohexane-1-carbonitrile) and the like as a preferable thermal polymerization initiator.

As content of a photoinitiator and / or a thermal-polymerization initiator, 0.5-20 mass% is preferable with respect to the quantity of a monomer, More preferably, it is 1-15 mass%. If the content of the polymerization initiator is 0.5% by mass or more with respect to the monomer, the effect as the polymerization initiator can be sufficiently exerted, and if it is 20% by mass or less, the change with time of the viscosity of the inkjet ink Or coloration due to decomposition products of the polymerization initiator can be prevented.
These initiators can be used alone or in combination of two or more.

  In addition to the polymerization initiator, a binder, a surfactant, and other additives may be used in combination as long as the remaining ink does not lose fluidity at 25 ° C. Examples of the binder to be used in combination include the binder resin described in paragraphs [0015] to [0030] of JP-A No. 2000-310706 and the paragraph numbers [0041] to [0050] of JP-A No. 2001-350012. And the like.

  As examples of the surfactant, the surfactants disclosed in JP-A-7-216276, paragraph [0021], JP-A-2003-337424, and JP-A-11-133600 are preferable. As mentioned. The content of the surfactant is preferably 5% by mass or less with respect to the total amount of the inkjet ink.

  Examples of other additives include other additives described in paragraph numbers [0058] to [0071] of JP-A No. 2000-310706.

<Color filter and manufacturing method thereof>
The color filter manufacturing method of the present invention is characterized in that a colored layer is formed by applying droplets of the inkjet ink of the present invention to a recess surrounded by a partition formed on a substrate by an inkjet method.

The method for producing a color filter of the present invention is a step of forming a colored layer by applying the inkjet ink of the present invention described above to the recess surrounded by the partition wall by an inkjet method (hereinafter referred to as “colored layer forming step”). Preferably, the at least one colored layer formed is cured by irradiation with active energy rays, or is cured by heat after all the colored layers having a desired hue are formed. It has a curing process and can be configured by providing other processes such as a baking process as necessary.
In addition, the partition is formed on the substrate in advance before the colored layer forming step, and details of the method for forming the partition will be described later.

-Colored layer formation process-
In the colored layer forming step, droplets of the inkjet ink of the present invention are applied to the recesses between the partition walls (dark color separation walls) by the inkjet method to form a colored layer. This colored layer becomes a color pixel of red (R), green (G), blue (B), etc. constituting the color filter.
The colored layer is formed by injecting ink-jet ink for forming colored pixels (for example, RGB three-color pixel pattern) into the recesses surrounded by the partition formed on the substrate as described above. It can be formed to include the plurality of pixels described above.
As the ink jet method, known methods such as a method of thermally curing ink, a method of photocuring, and a method of ejecting droplets after forming a transparent image receiving layer on a substrate in advance can be used.
The shape of the color filter pattern is not particularly limited, and may be a general stripe shape, a lattice shape, or a delta array shape as a black matrix shape.

As an inkjet method, a method in which charged inkjet ink is continuously ejected and controlled by an electric field, a method in which ink is intermittently ejected using a piezoelectric element, and an ink is heated and intermittently ejected using its foam. Various methods such as a method can be adopted.
As the injection conditions of the ink-jet ink, it is preferable from the viewpoint of the injection stability that the ink-jet ink is heated to 30 to 60 ° C. and the ink viscosity is lowered for injection. Ink-jet inks generally have higher viscosities than aqueous inks, so the viscosity fluctuation range due to temperature fluctuation is large. It is important to keep the ink-jet ink temperature as constant as possible, since the viscosity variation directly affects the droplet size and the droplet ejection speed and easily causes image quality degradation.

As the ink jet head (hereinafter also simply referred to as a head), a known one can be applied, and a continuous type or a dot on demand type can be used. Among the dot-on-demand types, the thermal head is preferably a type having an operation valve as described in JP-A-9-323420 for discharging. As the piezo head, for example, the heads described in European Patent A277,703, European Patent A278,590 and the like can be used. Among these, the piezo head is more preferable because the influence of heat on the ink-jet ink can be reduced and the selection of usable organic solvents is wide. The head preferably has a temperature control function so that the temperature of the ink can be controlled. It is preferable to set the injection temperature so that the viscosity at the time of ejection is 5 to 25 mPa · s, and to control the ink temperature so that the fluctuation range of the viscosity is within ± 5%. Further, the drive frequency is preferably 1 to 500 kHz. The shape of the nozzle does not necessarily need to be circular, and is not particular about the shape such as an ellipse or a rectangle. The nozzle diameter is preferably in the range of 10 to 100 μm. The nozzle opening itself is not necessarily a perfect circle. In this case, the nozzle diameter is assumed to be a circle equivalent to the area of the opening.
The color filter in the present invention is preferably in the form of a group composed of three colored layers by spraying RGB three-color inks.

  In the present invention, after removing the organic solvent contained in the droplets to form an ink residue, the ink residue is irradiated with an active energy ray (hereinafter sometimes referred to as a first curing step) and / or. Alternatively, a colored layer may be formed by polymerizing the remaining ink in a step of heating the remaining ink (hereinafter sometimes referred to as a second curing step). Further, when the temperature at which thermal polymerization of the remaining ink starts is T ° C., preheating (hereinafter sometimes referred to as a preheating step) is performed at a temperature lower than T ° C., and the ink is contained in the droplets. After the organic solvent is removed to form an ink residue, the ink residue is polymerized by a step of irradiating the ink residue with active energy rays and / or a step of heating the ink residue at a temperature of T ° C. or higher to form a colored layer. It may be formed.

Hereinafter, the first curing step, the second curing step, and the preheating step will be described.
-First curing step-
A step (first curing step) of irradiating and curing at least one colored layer formed in the colored layer forming step with active energy rays can be provided. In the first curing step, a cured colored layer can be formed by curing the inkjet ink of the present invention of each color including red (R), green (G), and blue (B). Curing may be performed each time a colored layer of one color is formed, or may be performed after forming a colored layer of a plurality of colors.

  Curing of the ink-jet ink according to the present invention such as R, G, B, etc. can be carried out by performing an exposure process that promotes polymerization curing using an energy source that emits an active energy ray in a wavelength region corresponding to the photosensitive wavelength of the ink. The

  Examples of the energy source include 400-200 nm ultraviolet light, far ultraviolet light, g-line, h-line, i-line, KrF excimer laser light, ArF excimer laser light, electron beam, X-ray, molecular beam, or ion beam. Those to which the above-mentioned polymerization initiator is sensitive can be appropriately selected and used. Specifically, a light source that emits actinic rays belonging to a wavelength region of 250 to 450 nm, preferably 365 ± 20 nm, for example, LD, LED (light emitting diode), fluorescent lamp, low pressure mercury lamp, high pressure mercury lamp, metal halide lamp, carbon arc lamp. , Xenon lamps, chemical lamps and the like. Preferred light sources include LEDs, high pressure mercury lamps, and metal halide lamps.

  The irradiation time of the active energy ray can be appropriately set according to the combination of the monomer and the polymerization initiator, and can be set to 1 to 30 seconds, for example.

-Second curing step-
In the method for producing a color filter of the present invention, a step (second curing step) of curing all the colored layers having a desired hue including red (R), green (G), and blue (B) by heat. Can be provided. As described above, by providing the first curing step and the second curing step, it is possible to achieve both the production efficiency of the color filter and the display characteristics. Moreover, you may make it harden | cure only by a 2nd hardening process.

  In this step, a colored layer and a partition wall having a desired hue are formed, and after the first curing step, a heat treatment (so-called baking treatment) can be further performed to cure by heat. That is, the substrate on which the colored layer and the partition wall photopolymerized by light irradiation are formed can be heated by being put in an electric furnace, a dryer or the like, or can be heated by being irradiated with an infrared lamp.

  The heating temperature and heating time at this time depend on the composition of the inkjet ink and the thickness of the colored layer, but generally from about 120 ° C. to about 250 ° C. from the viewpoint of ensuring sufficient solvent resistance, alkali resistance, and ultraviolet absorbance. It is preferable to heat at about 10 minutes to about 120 minutes.

In the method for producing a color filter using the inkjet ink of the present invention, a preheating step may be provided before the pixel portion is polymerized by exposure to active energy rays and / or heat treatment. The heating temperature in the preheating step is not particularly limited. However, when the temperature at which the thermal polymerization of the pixel portion starts is T ° C, a temperature that is lower than T ° C and does not cause the polymerization of the pixel portion is preferable, and is 50 ° C or higher. 100 degreeC or less is more preferable, and 60 degreeC or more and 90 degrees C or less are further more preferable. By including the above steps, the evaporation of the organic solvent in the pixel portion is promoted, and the color filter can be produced efficiently, and the viscosity of the remaining ink is reduced by heat, so that higher fluidity is obtained. Thus, a color filter having a highly flat pixel portion can be obtained.
The preheating step is effective not only for ink that polymerizes by heat but also for ink that is polymerized by light as long as the remaining ink portion has fluidity as in the present invention. In the case of an ink that is polymerized by light, the temperature T at which the ink starts thermal polymerization is the temperature at which the photopolymerization initiator or the like is decomposed by heat to start the polymerization reaction, or the monomer itself is decomposed by heat to cause the polymerization reaction to Mean temperature to start.
The time for the preheating step is not particularly limited, but it is preferably 1 to 5 minutes.

The temperature T can be obtained as follows.
Let T be the temperature at which the ink is heated, the polymerization of the ink starts by heating, and the gelation of the ink is observed. More specifically, T is the heating temperature when the increase in ink viscosity after heating is 5 mPa · s or more with respect to the ink viscosity before heating.

  In the method for producing a color filter using the ink-jet ink of the present invention, it is preferable that the colored layer forming step, the preliminary heating step, the first curing step, and the second curing step are performed within 24 hours. More preferably, it is performed within 6 hours, and further preferably within 6 hours. By performing the process from the formation of the colored layer to the final curing step (second curing step) within 24 hours, aggregation of pigments in the ink and precipitation of various binders are prevented, and the surface shape of the pixel is improved. be able to.

(Partition wall)
In the present invention, a colored layer is formed by applying a droplet of the inkjet ink of the present invention to a recess surrounded by a partition formed on a substrate by an inkjet method. Any partition may be used, but when a color filter is manufactured, a partition having a black matrix function and a light blocking property is preferable. The partition walls can be produced by the same material and method as those of known black matrixes for color filters. For example, paragraph numbers [0021] to [0074] of JP-A-2005-3861, black matrixes described in paragraph numbers [0012] to [0021] of JP-A-2004-240039, and JP-A 2006-17980 are disclosed. And the inkjet black matrix described in paragraphs [0009] to [0044] of JP-A No. 2006-10875.
Among the known production methods, it is preferable to use a photosensitive resin transfer material from the viewpoint of cost reduction. The photosensitive resin transfer material is a material in which at least a light-shielding resin layer is provided on a temporary support, and the resin layer having a light-shielding property can be transferred to the substrate by pressure bonding to the substrate.

The photosensitive resin transfer material is preferably formed using a photosensitive resin transfer material described in JP-A-5-72724, that is, an integral film. Examples of the constitution of the integral film include a temporary support / thermoplastic resin layer / intermediate layer / photosensitive resin layer (in the present invention, the “photosensitive resin layer” refers to a resin that can be cured by light irradiation, Is also referred to as a “light-shielding resin layer”, and when it is colored in a desired color, it is also referred to as a “colored resin layer”) / protective film laminated in this order.
Regarding the temporary support, the thermoplastic resin layer, the intermediate layer, the protective film, and the production method of the transfer material constituting the photosensitive resin transfer material, see paragraphs [0023] to [0066] of JP-A-2005-3861. Those described are preferred.

  The partition wall may be subjected to ink repellent treatment to prevent color mixing of the inkjet ink. As for the ink repellent treatment, for example, (1) a method of kneading an ink repellent substance into a partition wall (for example, see JP-A-2005-36160), and (2) a method of newly providing an ink repellent layer (for example, a special method) (See Kaihei 5-241101), (3) Method of imparting ink repellency by plasma treatment (for example, see JP-A-2002-62420), (4) Method of applying an ink-repellent material to the upper surface of the partition wall (See, for example, Japanese Patent Application Laid-Open No. 10-123500). In particular, (3) a method of performing an ink repellent treatment with plasma on a partition formed on a substrate is preferable.

  After forming the color filter by forming the colored region (colored pixel) and the partition as described above, an overcoat layer can be formed to cover the entire surface of the colored region and the partition for the purpose of improving the durability. .

The overcoat layer can protect the colored regions such as R, G, and B and the partition walls and can flatten the surface. However, it is preferable not to provide from the point which the number of processes increases.
An overcoat layer can be comprised using resin (OC agent), and acrylic resin composition, an epoxy resin composition, a polyimide resin composition etc. are mentioned as resin (OC agent). Among them, the acrylic resin composition is desirable because it is excellent in transparency in the visible light region, and the resin component of the photocurable composition for color filters is usually mainly composed of an acrylic resin and has excellent adhesion. . Examples of the overcoat layer include those described in paragraphs [0018] to [0028] of JP-A No. 2003-287618, and commercially available overcoat agents such as Optomer SS6699G manufactured by JSR.

  The color filter of the present invention is produced by the above-described method for producing the color filter of the present invention, and includes, for example, a portable terminal such as a television, a personal computer, a liquid crystal projector, a game machine, and a mobile phone, a digital camera, and a car navigation system. It can be suitably applied to applications such as without particular limitation. In the color filter of the present invention, at least one of color pixels such as red (R), green (G), and blue (B) may be formed by the color filter inkjet ink of the present invention.

<Display device>
The display device of the present invention is not particularly limited as long as it includes the color filter of the present invention described above, and a display device such as a liquid crystal display device, a plasma display display device, an EL display device, a CRT display device, etc. Is mentioned. For the definition of display devices and explanation of each display device, refer to “Electronic Display Devices (Akio Sasaki, published by Industrial Research Institute 1990)”, “Display Devices (Junaki Ibuki, Industrial Books Co., Ltd.) Issue)).

  Among the display devices of the present invention, a liquid crystal display device is particularly preferable. The liquid crystal display device is described in, for example, “Next-generation liquid crystal display technology (edited by Tatsuo Uchida, published by Kogyo Kenkyukai 1994)”. The liquid crystal display device to which the present invention can be applied is not particularly limited, and can be applied to various types of liquid crystal display devices described in, for example, the “next generation liquid crystal display technology”. Among these, the present invention is particularly effective for a color TFT liquid crystal display device. The color TFT liquid crystal display device is described in, for example, “Color TFT liquid crystal display (issued in 1996 by Kyoritsu Publishing Co., Ltd.)”. Furthermore, the present invention can be applied to a liquid crystal display device with a wide viewing angle such as a lateral electric field driving method such as IPS and a pixel division method such as MVA. These methods are described, for example, on page 43 of "EL, PDP, LCD display-latest technology and market trends (issued in 2001 by Toray Research Center).

  In addition to the color filter, the liquid crystal display device includes various members such as an electrode substrate, a polarizing film, a retardation film, a backlight, a spacer, and a viewing angle compensation film. For example, “'94 Liquid Crystal Display Peripheral Materials and Chemicals Market (Kentaro Shima, CMC 1994)” and “2003 Liquid Crystal Related Markets Current Status and Future Prospects (Volume 2)” (Table Yoshiyoshi) Fuji Chimera Research Institute, published in 2003) ”.

  The display device of the present invention includes ECB (Electrically Controlled Birefringence), TN (Twisted Nematic), IPS (In-Plane Switching), FLC (Ferroelectric Liquid Crystal), and OCB (OpticBandNyStic). Various display modes such as (Vertical Aligned), HAN (Hybrid Aligned Nematic), and GH (Guest Host) can be adopted. The display device of the present invention is characterized by including the color filter as described above, so that there is no display unevenness when mounted on a television or a monitor, and a wide color reproduction range and a high contrast ratio can be obtained. The display device of the present invention can also be suitably used for large screen display devices such as personal computer displays and television monitors.

In the following, exemplary embodiments of the invention are described. However, the present invention is not limited to these.
<1> A color filter inkjet ink containing at least a colorant, an organic solvent, and a monomer having two or more polymerizable groups, wherein the color filter inkjet ink has an average thickness of 1 mm and a thickness of 5 mmHg (0 Ink-jet ink for color filters, wherein the viscosity of the remaining ink obtained by drying for 8 hours under the conditions of .67 kPa) and 45 ° C. is 40 mPa · s to 4000 mPa · s at 25 ° C.
<2> The ink for a color filter according to <1>, wherein the viscosity of the remaining ink is from 50 mPa · s to 2000 mPa · s at 25 ° C.
<3> The ink for a color filter according to <1>, wherein the monomer has three or more polymerizable groups.
<4> The inkjet ink for a color filter according to <1>, wherein the colorant is a pigment.
<5> The inkjet ink for a color filter according to <1>, wherein the proportion of the colorant in the remaining ink is 20% by mass or more.
<6> The inkjet ink for a color filter according to <1>, wherein the ratio of the organic solvent is 40% by mass or more.
<7> The ink for a color filter according to <1>, wherein the monomer has a viscosity at 25 ° C. of 700 mPa · s or less and has three or more polymerizable groups.
<8> The ink for a color filter according to <1>, wherein the monomer has a viscosity at 25 ° C. of 200 mPa · s or less and has three or more polymerizable groups.
<9> The inkjet ink for a color filter according to <1>, wherein the polymerizable group is any one selected from the group consisting of an epoxy group, an acryloyloxy group, and a methacryloyloxy group.
<10> The inkjet ink for a color filter according to <1>, wherein 50% by mass or more of the organic solvent is composed of a compound having a boiling point of 160 ° C. or higher at 760 mmHg (101.3 kPa).
<11> The inkjet ink for a color filter according to <1>, further comprising a polymerization initiator.
<12> The polymerization initiator is 2,4-bis (trichloromethyl) -6- [4 ′-(N, N-bisethoxycarbonylmethyl) amino-3′-bromophenyl] -s-triazine. The inkjet ink for color filters as described in <11> characterized by these.
<13> The inkjet ink for a color filter according to <1>, further comprising a surfactant.
<14> A color filter, wherein a color layer is formed by applying droplets of the inkjet ink for color filter according to claim 1 to a recess surrounded by a partition formed on a substrate by an inkjet method. Manufacturing method.
<15> After removing the organic solvent contained in the droplets to form an ink residue, the ink residue is polymerized by irradiating the ink residue with an active energy ray and / or heating the ink residue. The method for producing a color filter according to <14>, wherein a colored layer is formed.
<16> When the temperature at which thermal polymerization of the remaining ink starts is T ° C., preheating is performed at a temperature lower than T ° C. to remove the organic solvent contained in the droplets to form the remaining ink, <15>, wherein the ink residue is polymerized by the step of irradiating the ink residue with active energy rays and / or the step of heating the ink residue at a temperature of T ° C. or higher to form a colored layer. Manufacturing method of color filter.
<17> A color filter produced by the method for producing a color filter according to <14>.
<18> A display device comprising the color filter according to <17>.

The entire disclosure of Japanese Patent Application No. 2006-1000074 is incorporated herein by reference.
All documents, patent applications, and technical standards mentioned in this specification are to the same extent as if each individual document, patent application, and technical standard were specifically and individually described to be incorporated by reference, Incorporated herein by reference.

  The present invention will be described more specifically with reference to the following examples. The materials, reagents, ratios, equipment, operations, and the like shown in the following examples can be appropriately changed without departing from the scope of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below. In the following examples, “%” and “parts” represent “mass%” and “parts by mass” unless otherwise specified, and the molecular weight indicates the weight average molecular weight.

[Experiment 1]
[Preparation of dark color composition for barrier rib formation]
The dark color composition K1 is first weighed in the amount of K pigment dispersion 1 and propylene glycol monomethyl ether acetate listed in Table 1, mixed at a temperature of 24 ° C. (± 2 ° C.), stirred at 150 rpm for 10 minutes, and then Methyl ethyl ketone, binder 2, hydroquinone monomethyl ether, DPHA solution, 2,4-bis (trichloromethyl) -6- [4 '-(N, N-bisethoxycarbonylmethyl) amino-3' in the amounts shown in Table 1 -Bromophenyl] -s-triazine and Surfactant 1 are weighed out, added in this order at a temperature of 25 ° C. (± 2 ° C.), and stirred at 150 rpm for 30 minutes at a temperature of 40 ° C. (± 2 ° C.). It was. In addition, the quantity of Table 1 is a mass part, and has the following composition in detail.

<K pigment dispersion 1>,
・ Carbon black (Nippex 35 manufactured by Degussa) 13.1%
-Dispersant 1 (the following compound 1) 0.65%
-Polymer (benzyl methacrylate / methacrylic acid = 72/28 molar ratio random copolymer, molecular weight 37,000) 6.72%
Propylene glycol monomethyl ether acetate 79.53%

<Binder 2>
・ Polymer (benzyl methacrylate / methacrylic acid = 78/22 molar ratio random copolymer, molecular weight 38,000) 27%
・ Propylene glycol monomethyl ether acetate 73%

<DPHA solution>
Dipentaerythritol hexaacrylate (containing 500 ppm of polymerization inhibitor MEHQ, manufactured by Nippon Kayaku Co., Ltd., trade name: KAYARAD DPHA) 76%
・ Propylene glycol monomethyl ether acetate 24%

<Surfactant 1>
・ The following structure 1 30%
・ Methyl ethyl ketone 70%

(Formation of partition walls)
The alkali-free glass substrate was cleaned with a UV cleaning apparatus, then brush-cleaned with a cleaning agent, and further ultrasonically cleaned with ultrapure water. The substrate was heat-treated at 120 ° C. for 3 minutes to stabilize the surface state.
After cooling the substrate and adjusting the temperature to 23 ° C., a dark color composition prepared as described above with a glass substrate coater (manufactured by FS Asia Co., Ltd., trade name: MH-1600) having a slit-like nozzle Material K1 was applied. Subsequently, a part of the solvent was dried with a VCD (vacuum dryer, manufactured by Tokyo Ohka Kogyo Co., Ltd.) for 30 seconds to eliminate the fluidity of the coating layer, and then pre-baked at 120 ° C. for 3 minutes to give a dark colored composition having a thickness of 2 μm Layer K1 was obtained.
In a proximity type exposure machine (manufactured by Hitachi High-Tech Electronics Engineering Co., Ltd.) with an ultra-high pressure mercury lamp, the exposure mask surface and dark color composition with the substrate and mask (quartz exposure mask with image pattern) standing vertically The distance between the physical layers K1 was set to 200 μm, and pattern exposure was performed at an exposure amount of 300 mJ / cm ² in a nitrogen atmosphere.
Next, pure water is sprayed with a shower nozzle to uniformly wet the surface of the dark color composition layer K1, and then a KOH developer (containing a nonionic surfactant, trade names: CDK-1, Fuji Film). Electronics Materials Co., Ltd. 100-fold diluted) was subjected to shower development at 23 ° C. for 80 seconds and a flat nozzle pressure of 0.04 MPa to obtain a patterning image. Subsequently, ultrapure water was sprayed at a pressure of 9.8 MPa with an ultrahigh pressure cleaning nozzle to remove the residue, and formation of a dark color composition layer K1 on the glass substrate at an exposure amount of 2500 mJ / cm ^{2 in} the atmosphere. Post-exposure was performed from the formed side to obtain a partition wall having an optical density of 3.9.

[Ink repellent plasma treatment]
The substrate on which the barrier ribs were formed was subjected to ink repellent plasma treatment under the following conditions using a cathode coupling parallel plate type plasma treatment apparatus.
Gas used: CF ₄
Gas flow rate: 80sccm
Pressure: 40Pa
RF power: 50W
Processing time: 30 sec

[Experiment 2]
-Preparation of pigment dispersion-
<Pigment dispersion for G (G1)>
Table 2 below shows pigment dispersant 1 (compound 1) and solvent (1,3-butanediol diacetate) (hereinafter abbreviated as 1,3-BGDA) in brominated phthalocyanine green (CI Pigment Green 36). After premixing, disperse for 9 hours with a motor mill M-50 (manufactured by Eiger Japan) using zirconia beads with a diameter of 0.65 mm at a peripheral speed of 9 m / s. A liquid (G1) was prepared.
<Other pigment dispersions>
In the G pigment dispersion (G1) of Experimental Example 2, the pigment dispersion (G2) for G was the same as the pigment dispersion (G1) for G except that the pigment and other components were blended as shown in Table 2. , R pigment dispersions (R1) and (R2) and B pigment dispersions (B1) and (B2) were prepared.

[Experiment 3]
-Preparation of colored ink for pixels-
<B inkjet ink>
After the following components were mixed and stirred at 25 ° C. for 30 minutes, it was confirmed that there was no insoluble matter, and a monomer liquid A was prepared.
(Monomer liquid A)
1,3-butanediol diacetate (1,3-BGDA; boiling point 232 ° C.) 4.0 parts Propylene glycol monomethyl ether acetate (PGMEA; boiling point 146 ° C.) 28.0 parts Aronics M-309 (trimethylolpropane triacrylate, Viscosity: 85 mPa · s at 25 ° C. 12.0 parts Surfactant 1 0.1 part manufactured by Toagosei Co., Ltd. Thermal polymerization initiator V-40 (azobis (cyclohexane-1-carbonitrile)) Wako Pure Chemical Industries, Ltd. Manufacture 0.6 part Next, stirring the following pigment dispersion liquid, the said monomer liquid was added slowly, and it stirred for 30 minutes at 25 degreeC, and prepared the inkjet ink for B (ink B-1).

B pigment dispersion (B1) 28.0 parts B pigment dispersion (B2) 28.0 parts

<Measurement of ink properties>
When the viscosity of the ink B-1 was measured under the following conditions using an E-type viscometer (RE-80L) manufactured by Toki Sangyo Co., Ltd., the viscosity was 8.5 mPa · s.
(Measurement condition)
-Rotor used: 1 ° 34 'x R24
・ Measurement time: 2 minutes ・ Measurement temperature: 25 ° C
Moreover, when the surface tension of the ink B-1 was measured using a surface tension meter (FACE SURFACE TENSIOMETER CBVB-A3) manufactured by Kyowa Interface Science Co., Ltd., the surface tension was 25.4 mN / m (at 25 ° C.). Met.

<Measurement of remaining ink viscosity>
First, the ink jet ink for B (ink B-1) is placed in an aluminum tray so that the average thickness is 1 mm, air-dried, and then vacuum-dried (0.67 kPa) for 8 hours at 45 ° C. A sample was collected from an aluminum dish using This sample was measured using a viscoelasticity measuring device DynAlyser DAS-100 manufactured by Jasco International Co. Ltd. at a measurement temperature of 25 ° C. and a frequency of 1 Hz. The viscosity of the obtained ink remainder at 25 ° C. was 1400 mPa · s.

[Experiment 4]
-Formation of pixel part by inkjet method-
Next, using the ink B-1 described above, an inkjet head (SE-) manufactured by Dimatix Co., Ltd. was formed in the region (the concave portion surrounded by the convex portion) divided by the partition wall of the color filter substrate obtained in Experimental Example 1. 128, a head temperature of 28 ° C.), ink was discharged until a desired density was obtained, and a color filter composed of a B pattern was produced. Both the partition walls and the pixels were completely cured by baking the image-colored color filter in an oven at 230 ° C. for 30 minutes. The height of the partition walls after curing and the level difference between the pixel portions were 0.2 μm.

<Evaluation of flatness of pixel portion>
The shape of the pixel portion was observed using a non-contact type surface shape measuring apparatus New View 6K (manufactured by Zygo), and the profile of the surface shape was calculated. The lowest part is A, the highest part is B, and the flatness is evaluated according to the following standard based on the height difference (B−A). The result is 0.03 μm, and a pixel part with excellent flatness is obtained. I was able to.

(Evaluation of flatness)
A: B-A <0.1 μm
B: 0.1 μm ≦ B−A <0.3 μm
C: 0.3 μm ≦ B−A <0.6 μm
D: 0.6 μm ≦ BA

[Experimental Example 5]
Ink B-1 of Experimental Example 3 was prepared in the same manner as Ink B-1, except that the monomer components in the ink were changed as shown in Table 3, and B inkjet inks (inks B-2 to B-11) were prepared. did. Further, the physical properties of the ink were evaluated by the same method. The results are shown in Table 3.

<Evaluation of formation and flatness of pixel portion>
Using the inks of the inks B-2 to 11, the formation of the blue pixel portion and the evaluation of the flatness were performed according to the method described in Experimental Example 4. The results are shown in Table 4.

[Experimental example 6]
-Fabrication of color filters and display devices-
<Preparation of inkjet ink for R and inkjet ink for G>
In the ink jet ink for B (Ink B-1) of Experimental Example 3, the same procedure as that for the ink jet ink for B (Ink B-1) was performed except that the pigment dispersion and other components were blended as shown in Table 5. An inkjet ink (ink R-1) and an inkjet ink for G (G-1) were prepared.

  Further, when the viscosity of the remaining ink was measured in the same manner as in Experimental Example 3, the viscosity at 25 ° C. of the remaining ink of ink R-1 and ink G-1 was 1400 mPa · s and 1300 mPa · s, respectively.

<Production of color filter>
Next, using the ink R-1, the ink G-1, and the ink B-1 described above, in the region divided by the partition wall of the color filter substrate in the same manner as in Experimental Example 4 (concave portion surrounded by the convex portion) Further, ink was ejected to a desired density using an ink jet recording apparatus, and a color filter 1 composed of R, G, and B patterns was produced. The color filter after image coloring was baked in an oven at 230 ° C. for 30 minutes to completely cure the partition walls and each pixel. When the flatness of the R pixel portion and the G pixel portion was evaluated by the method described in Experimental Example 4, the following results were obtained, and good flatness was obtained.
R pixel portion: A Height difference of the pixel portion (BA): 0.05 μm
G pixel portion: A Height difference of pixel portion (BA): 0.04 μm

<Production of display device>
A transparent electrode made of ITO (Indium Tin Oxide) was further formed by sputtering on the R pixel, G pixel, B pixel and partition walls of the color filter substrate obtained above. No reticulation occurred in the R, G, and B pixels during ITO sputtering. Separately, a glass substrate was prepared as a counter substrate, and patterning was performed for the PVA mode on the transparent electrode and the counter substrate of the color filter substrate, respectively.

A photo spacer was provided in a portion corresponding to the upper part of the partition wall on the ITO transparent electrode, and an alignment film made of polyimide was further provided thereon.
Then, a UV curable resin sealant is applied to the position corresponding to the outer wall of the partition wall surrounding the pixel group of the color filter by a dispenser method, and the PVA mode liquid crystal is dropped and bonded to the counter substrate. Thereafter, the bonded substrate was irradiated with UV, and then heat-treated to cure the sealing agent. Polarizing plates HLC2-2518 manufactured by Sanlitz Co., Ltd. were attached to both surfaces of the liquid crystal cell thus obtained. Next, a backlight of a cold cathode tube was constructed and arranged on the side of the liquid crystal cell provided with the polarizing plate, and the liquid crystal display device 1 was obtained.

[Experimental example 7]
In the preparation of the RGB inkjet ink of Experimental Example 6, ink R-3 to 8 and ink G-3 were prepared in the same manner as in Experimental Example 6 except that the pigment dispersion and other components were blended as shown in Tables 6-7. ~ 8 were prepared.

  Here, the numbers of polymerizable groups of Aronics M-309, NK ester A-DPH, Denacol EX-314, and Aronics M-220 are 3, 6, 3 and 2, respectively.

<Binder 3>
・ Polymer (benzyl methacrylate / methacrylic acid = 70/30 molar ratio random copolymer, molecular weight 1 million) 45%
・ Propylene glycol monomethyl ether acetate 55%

Table 8 shows the results of evaluating the flatness of the pixel portion formed by the same method as in Experimental Example 6 using the inks R-3 to 8 and G-3 to 8. Table 9 shows the results of evaluating the occurrence of reticulation (hereinafter abbreviated as “reticle”) during ITO sputtering of the ink of the present invention. The flatness of the pixel portion was evaluated by the method described in Experimental Example 4.
(Evaluation criteria for ITO suitability)
5 ... No reticular occurs.
4 ... Little retism is generated. 3 ... Slight reticular generation is observed.
2 ... Partial reciprocation is observed.
1 ... A large amount of reticulation has occurred, and fogging has occurred in the pixel portion.

  From the results in Table 8, the color filter of the present invention in which the residual viscosity of the ink was 40 mPa · s or more and 4000 mPa · s or less at 25 ° C. had good flatness. Moreover, it was found from Table 9 that when no monomer having 3 or more polymerizable groups is contained, reticulation occurs during ITO sputtering.

[Experimental Example 8]
In the production of the color filter 1 and the liquid crystal display device 1 of Experimental Example 6, the color filters 2 to 7 and the corresponding liquid crystal display devices 2 to 7 were used in the same manner as in Experimental Example 6 except that the combinations shown in Table 10 were used as RGB inks. Was made.

[Experimental Example 9]
<Formation of partition walls>
(Preparation of dark photosensitive transfer material K2)
On a 75 μm thick polyethylene terephthalate film temporary support, a coating solution for a thermoplastic resin layer having the following formulation H1 was applied and dried using a slit nozzle. Next, an intermediate layer coating solution having the following formulation P1 was applied and dried. Further, the dark color composition K1 was applied and dried. In this way, a thermoplastic resin layer having a dry film thickness of 14.6 μm, an intermediate layer having a dry film thickness of 1.6 μm, and a dark color composition layer having a dry film thickness of 2 μm are provided on the temporary support. Finally, a protective film (thickness 12 μm polypropylene film) was pressure-bonded.
In this way, a dark color photosensitive transfer material in which the temporary support, the thermoplastic resin layer, the intermediate layer (oxygen barrier film), and the dark color composition layer are integrated is prepared, and the sample name is the dark color photosensitive transfer material K2. did.

<Coating liquid for thermoplastic resin layer: Formulation H1>
・ Methanol 11.1 parts ・ Propylene glycol monomethyl ether acetate 6.36 parts ・ Methyl ethyl ketone 52.4 parts ・ Methyl methacrylate / 2-ethylhexyl acrylate / benzyl methacrylate / methacrylic acid copolymer (copolymerization composition ratio (molar ratio) = 55) /11.7/4.5/28.8, molecular weight = 100,000, Tg≈70 ° C.) 5.83 parts styrene / acrylic acid copolymer (copolymerization composition ratio (molar ratio) = 63/37, average Molecular weight = 10,000, Tg≈100 ° C.) 13.6 parts 2,2-bis [4- (methacryloxypolyethoxy) phenyl] propane (manufactured by Shin-Nakamura Chemical Co., Ltd.) 9.1 parts Surfactant 1 0.54 parts

<Intermediate layer coating solution: Formulation P1>
・ PVA205 (polyvinyl alcohol, manufactured by Kuraray Co., Ltd.,
Degree of saponification = 88%, degree of polymerization 550) 32.2 parts · Polyvinylpyrrolidone (APS Japan, K-30) 14.9 parts · Distilled water 524 parts · Methanol 429 parts

The alkali-free glass substrate was washed with a rotating brush having nylon hair while spraying a glass detergent solution adjusted to 25 ° C. for 20 seconds by showering, and after washing with pure water shower, silane coupling solution (N-β (aminoethyl)) A 0.3% by mass aqueous solution of γ-aminopropyltrimethoxysilane, trade name: KBM603, manufactured by Shin-Etsu Chemical Co., Ltd.) was sprayed for 20 seconds with a shower and washed with pure water. This substrate was heated at 100 ° C. for 2 minutes with a substrate preheating apparatus.
The cover film is removed from the dark photosensitive transfer material K2 produced by the above manufacturing method on the obtained silane coupling treated glass substrate, and the surface of the dark color composition layer exposed after the removal and the silane coupling treatment The glass substrate is superposed so that the surface is in contact with each other, and the substrate heated at 100 ° C. for 2 minutes using a laminator (manufactured by Hitachi Industries, Ltd. (Lamic II type)) has a rubber roller temperature of 130 ° C. and a linear pressure of 100 N. / Cm, laminating at a conveyance speed of 2.2 m / min. Subsequently, the polyethylene terephthalate temporary support was peeled off at the interface with the thermoplastic resin layer to remove the temporary support. After peeling off the temporary support, exposure is performed with a proximity type exposure machine (manufactured by Hitachi High-Tech Electronics Engineering Co., Ltd.) having an ultra-high pressure mercury lamp with the substrate and mask (quartz exposure mask with image pattern) standing vertically. The distance between the mask surface and the dark color composition layer was set to 200 μm, and pattern exposure was performed at an exposure amount of 70 mJ / cm ² .

Next, a triethanolamine developer (containing 30% by mass of triethanolamine, trade name: T-PD2, manufactured by Fuji Photo Film Co., Ltd., 12 times with pure water (1 part by mass of T-PD2 and pure water) The solution diluted to 11 parts by mass) was developed with shower at 30 ° C. for 50 seconds and a flat nozzle pressure of 0.04 MPa to remove the thermoplastic resin layer and the intermediate layer. Subsequently, after air was blown off on the upper surface of the substrate, pure water was sprayed for 10 seconds by a shower, pure water shower cleaning was performed, and air was blown to reduce a liquid pool on the substrate.
Subsequently, Na carbonate-based developer (0.38 mol / liter sodium hydrogen carbonate, 0.47 mol / liter sodium carbonate, 5% by weight sodium dibutylnaphthalenesulfonate, anionic surfactant, antifoaming agent, stabilizer included , Trade name: T-CD1, manufactured by Fuji Photo Film Co., Ltd. diluted 5 times with pure water) and shower-developed at 29 ° C. for 30 seconds with a cone type nozzle pressure of 0.15 MPa to form a dark color composition layer Development was performed to obtain a patterning image.
Subsequently, a detergent (containing phosphate, silicate, nonionic surfactant, antifoaming agent and stabilizer, trade name: T-SD1 manufactured by Fuji Photo Film Co., Ltd.) diluted 10 times with pure water, used at 33 ° C. Sprayed with a shower at a cone type nozzle pressure of 0.02 MPa for 20 seconds, and further removed the residue by rubbing the image formed with a rotating brush having nylon bristles to obtain a partition wall.
Thereafter, except that a mask is not used for the substrate, post exposure from the side on which the dark color composition layer of the substrate is formed with an exposure amount of 3000 mJ / cm ² with the exposure machine used in the exposure step, 220 A heat treatment was performed at 15 ° C. for 15 minutes.

Next, an ink repellent treatment was performed by the following method.
[Ink repellent treatment by coating method]
Alkali-soluble, in which 0.5% (based on the solid content of the photosensitive resin) of a fluorosurfactant (manufactured by Sumitomo 3M, Florard FC-430) is previously added on the substrate on which the partition walls are formed. A photosensitive resin (Positive photoresist AZP4210, manufactured by Hoechst Shapan Co., Ltd.) was applied using a slit-like nozzle so as to have a film thickness of 2 μm, and heat treatment was performed at 90 ° C. for 30 minutes in a hot air circulating dryer. .
Next, the substrate is exposed with an exposure amount of 110 mJ / cm ² (38 mW / cm ² × 2.9 seconds) from the side opposite to the side on which the partition is formed, and the inorganic alkali development is performed. A pixel is obtained by immersing and shaking in liquid (Hoechst Japan, AZ400K developer, 1: 4) for 80 seconds, followed by rinsing in pure water for 30 to 60 seconds to form a water-repellent resin layer on the partition walls. A surface energy difference was provided inside and outside. The surface energy inside and outside the pixel after the formation of the water-repellent resin layer was 10 to 15 dyne / cm outside the pixel (on the resin layer) and around 55 dyne / cm inside the pixel (on the glass substrate).

  Next, after coloring the pixel portion using inks R-1, G-1, and B-1 in the same manner as in Experimental Example 6, the color filter was baked in an oven at 230 ° C. for 30 minutes, so that the partition wall and each pixel Both were completely cured to produce a color filter 9. When the flatness of the RGB pixel portion was evaluated by the same method as in Experimental Example 6, it was possible to obtain good flatness in the same manner as the color filter 1 for both RGB. A liquid crystal display device 9 was produced using the color filter 9 in the same manner as in Experimental Example 6.

[Experimental Example 10]
A partition wall was prepared in the same manner as in Experimental Example 9 except that the dark color photosensitive transfer material K2 was changed to the following dark color photosensitive transfer material K3 in the formation of the partition wall of Experimental Example 9. After coloring the pixel portions with the inks R-1, G-1, and B-1 on the partition walls in the same manner as in Experimental Example 6, the color filters were baked in an oven at 230 ° C. for 30 minutes. Both pixels were completely cured to produce a color filter 10. When the flatness of the RGB pixel portion was evaluated by the same method as in Experimental Example 6, it was possible to obtain good flatness in the same manner as the color filter 1 for both RGB. A liquid crystal display device 10 was manufactured using the color filter 10 in the same manner as in Experimental Example 6.

[Preparation of dark photosensitive transfer material K3]
The dark color composition K1 was applied onto a polyethylene terephthalate film (Tetron G2 manufactured by Teijin DuPont Film Co., Ltd.) having a thickness of 16 μm using a slit nozzle and dried. In this way, a dark color composition layer having a dry film thickness of 2.0 μm was provided on the temporary support, and finally a protective film (thickness 12 μm polypropylene film) was pressure-bonded.
In this way, a dark color photosensitive transfer material in which the temporary support and the dark color composition layer were integrated was prepared, and the sample name was dark color photosensitive transfer material K3.

<Evaluation>
(Evaluation of variation in color density in the pixel area)
For the liquid crystal display devices 1 to 10, R, G and B single color images were developed, and 10 persons determined whether or not there was uneven color in an area of 10 cm × 10 cm.
[Evaluation criteria]
A: Number of people recognized as having uneven color 0: B: Number of people recognized as having uneven color 1 to 2 people C: Number of people recognized as having uneven color 3 or more

(Evaluation of display unevenness)
Display unevenness when the liquid crystal display devices 1 to 10 were displayed in white and black was evaluated according to the following evaluation criteria.
[Evaluation criteria]
A: No unevenness was observed in both the white display and the black display.
B: Unevenness was not observed in black display, but unevenness was observed in white display.
C: Unevenness was observed in both white display and black display.
The evaluation results are shown in Table 11.

[Experimental example 11]
In Table 5 of Experimental Example 6, V-40 was replaced with 2,4-bis (trichloromethyl) -6- [4 ′-(N, N-bisethoxycarbonylmethyl) amino-3′-bromophenyl] -s-triazine. The ink jet ink for R (ink R-9), the ink jet ink for G (ink G-9), and the ink jet ink for B (ink B-12) were prepared in the same manner as in Experimental Example 6 except that the above was changed. In the same manner as in Experiment 6 using the above RGB ink, the ink is used in the region (the concave portion surrounded by the convex portion) divided by the partition wall of the color filter substrate until the desired density is obtained using the ink jet recording apparatus. Thus, a color filter 11 having R, G, and B patterns was produced.
Next, after exposing the pixel portion from the back surface of the substrate with an exposure amount of 110 mJ / cm ² (38 mW / cm ² × 2.9 seconds) and curing the pixel portion, the color filter after image coloring is placed in an oven at 230 ° C. Both the partition walls and the pixels were completely cured by baking for 30 minutes. When the flatness of the RGB pixel portion of the color filter 11 was evaluated by the method described in Experimental Example 4, good flatness was obtained as in the color filter 1.

R pixel portion: A Height difference of the pixel portion (BA): 0.06 μm
G pixel portion: A Height difference of the pixel portion (BA): 0.05 μm
B pixel portion: A Height difference of the pixel portion (BA): 0.07 μm

[Experimental example 12]
Using the inks B-3 and B-4 of Experimental Example 5, before baking for 30 minutes in an oven at 230 ° C., the same procedure as in Experimental Example 4 was performed except that any of the following Steps A to C was added. A pixel portion was formed, and the flatness of the pixel portion was evaluated.
Step A: Heat treatment is performed in a 70 ° C. oven for 2 minutes.
Step B: Immediately after the ink is deposited, heat treatment is performed in an oven at 150 ° C. for 2 minutes.
Step C: Ink droplets are deposited and dried for 10 minutes under 5 mmHg (0.67 kPa) conditions, and then heat-treated in a 150 ° C. oven for 2 minutes.
Table 12 shows the evaluation results of the flatness.

  From the results in Table 12, it can be seen that the pre-heating at a temperature lower than the thermal polymerization start temperature of the ink improves the flatness of the pixel portion. It can also be seen that if the preheating is carried out at the polymerization temperature or higher before the drying is finished, the flatness is deteriorated.

[Experimental Example 13]
Ink B-1 was prepared by changing the solvent composition so that the ratio of 1,3-BGDA (high boiling point organic solvent) in the organic solvent was 20%, 45%, and 55% in ink B-1. did. Further, ink B-16 to 18 were prepared by adjusting the amount of the organic solvent without changing the solvent composition so that the solid content in the ink was 100%, 65%, and 45%. Further, inks B-19 and 20 were prepared by adjusting the amount of the pigment dispersion and the solvent composition so that the ratio of the pigment in the solid content was 5% and 15%. Further, a UV ink cartridge cyan (viscosity 15 mPa · s at 25 ° C.) manufactured by Mimaki Engineering Co., Ltd. was prepared as a solvent-free ink. Using the inks B-1, 13 to 20 and solventless ink, a blue pixel portion was formed in the same manner as in Experimental Example 4, and an ITO transparent electrode was formed by the method described in Experimental Example 5, a) The ejection stability and b) the flatness of the pixel portion were evaluated.

(Evaluation of ejection stability)
After the ink is filled into the ink jet head and discharged from the head, and it is confirmed that the ink is discharged from all nozzles (128 nozzles) of the head, the discharge is stopped for 5 minutes. Thereafter, the ink is again ejected from all nozzles for 1 minute. After the stop → discharge process was repeated four times, the number of nozzles where ink was not discharged was counted and evaluated according to the following evaluation criteria.
(Evaluation criteria)
A: Number of nozzles that do not eject ink is 0
B: Number of nozzles from which ink is not ejected is 1-2
C: 3 to 20 nozzles from which ink is not ejected
D: Ink is hardly ejected.
Table 13 shows the physical properties and evaluation results of the inks used for the evaluation.

  In Table 13, the ink ejection amounts of the inks B-18 and 19 and the solventless ink were adjusted so that the solid component in the ink filled the concave portion surrounded by the partition walls. The evaluation in parentheses is an evaluation result when ink is ejected by adjusting so as to match the optical density of the pixel portion (since the ink overflows from the concave portion and becomes convex, the flatness deteriorates).

By using the ink-jet ink of the present invention, there is no need to provide an ink receiving layer or a protective layer, the productivity is excellent, the flatness of the pixel portion and the color density variation in the pixel portion are small, and the display quality is uniform. An excellent color filter and a display device using the color filter can be obtained.
Further, from the results of Table 13, the ratio of the high boiling point solvent is 50% or more, the solid content in the ink is 60% or less, and the ratio of the pigment in the solid content is 20% or more. It can be seen that by adjusting the ink, it is possible to obtain an ink-jet ink for a color filter that has not only excellent flatness of the pixel portion but also excellent ink ejection stability.

Claims (18)

An ink-jet ink for a color filter containing at least a monomer having a colorant, an organic solvent and two or more polymerizable groups,
The viscosity of the ink remaining obtained by drying the inkjet ink for color filter under the condition of 5 mmHg (0.67 kPa) and 45 ° C. with an average thickness of 1 mm is 40 mPa · s to 4000 mPa · s at 25 ° C. An ink-jet ink for a color filter, which is equal to or less than s.   The inkjet ink for a color filter according to claim 1, wherein the viscosity of the remaining ink is 50 mPa · s or more and 2000 mPa · s or less at 25 ° C.   The inkjet ink for a color filter according to claim 1, wherein the monomer has three or more polymerizable groups.   The color filter inkjet ink according to claim 1, wherein the colorant is a pigment.   2. The inkjet ink for a color filter according to claim 1, wherein a ratio of the colorant in the remaining ink is 20% by mass or more.   The color filter inkjet ink according to claim 1, wherein a ratio of the organic solvent is 40% by mass or more.   2. The inkjet ink for color filter according to claim 1, wherein the monomer has a viscosity at 25 ° C. of 700 mPa · s or less and has three or more polymerizable groups.   The inkjet ink for a color filter according to claim 1, wherein the monomer has a viscosity at 25 ° C of 200 mPa · s or less and has three or more polymerizable groups.   The inkjet ink for a color filter according to claim 1, wherein the polymerizable group is selected from the group consisting of an epoxy group, an acryloyloxy group, and a methacryloyloxy group.   2. The inkjet ink for a color filter according to claim 1, wherein 50% by mass or more of the organic solvent is composed of a compound having a boiling point of 160 ° C. or higher at 760 mmHg (101.3 kPa).   The inkjet ink for a color filter according to claim 1, further comprising a polymerization initiator.   The polymerization initiator is 2,4-bis (trichloromethyl) -6- [4 ′-(N, N-bisethoxycarbonylmethyl) amino-3′-bromophenyl] -s-triazine. The inkjet ink for a color filter according to claim 11.   The inkjet ink for a color filter according to claim 1, further comprising a surfactant.   A method for producing a color filter, comprising forming a colored layer by applying droplets of the inkjet ink for a color filter according to claim 1 to a recess surrounded by a partition formed on a substrate by an inkjet method. .   After removing the organic solvent contained in the droplets to form an ink residue, the ink residue is polymerized by a step of irradiating the ink residue with active energy rays and / or a step of heating the ink residue to form a colored layer. The method for producing a color filter according to claim 14, wherein the color filter is formed.   When the temperature at which thermal polymerization of the remaining ink starts is T ° C., preheating is performed at a temperature lower than T ° C. to remove the organic solvent contained in the droplets to form the remaining ink, and then the remaining ink The color filter according to claim 15, wherein the ink residue is polymerized to form a colored layer by irradiating active energy rays on the surface and / or heating the ink residue at a temperature of T ° C. or more. Manufacturing method.   A color filter produced by the method for producing a color filter according to claim 14.   A display device comprising the color filter according to claim 17.