KR20080106442A - Inkjet ink for color filter, color filter, method for production of color filter, and display device - Google Patents

Abstract

Disclosed is an inkjet ink for use in a color filter, which comprises at least a coloring agent, an organic solvent and a monomer having two or more polymerizable groups. When the ink is applied in an average thickness of 1 mm and dried at 5 mmHg (0.67 kPa) and 45‹C for 8 hours, the remaining ink shows a viscosity ranging from 40 to 4000 mPa s inclusive at 25‹C. Also disclosed is a method for production of a color filter by using the ink. Further disclosed is a color filter produced by the method. Still further disclosed is a display device having the color filter. ® KIPO & WIPO 2009

Description

INKJET INK FOR COLOR FILTER, COLOR FILTER, METHOD FOR PRODUCTION OF COLOR FILTER, AND DISPLAY DEVICE}

The present invention relates to an ink jet ink for color filters, a manufacturing method of a color filter using the ink, a color filter obtained by the manufacturing method, and a display device having the color filter.

In recent years, with the development of personal computers, especially large-screen liquid crystal televisions, the demand for liquid crystal displays, especially color liquid crystal displays, tends to increase. However, since color liquid crystal displays are expensive, the demand for cost reduction is increasing. In particular, there is a high demand for cost reduction for color filters having a high cost.

Such a color filter is normally provided with the coloring pattern of three primary colors of red (R), green (G), and blue (B). In the liquid crystal display provided with this color filter, the liquid crystal acts as a shutter by turning on and off the electrodes corresponding to the respective pixels of R, G, and B, and light passes through the pixels of R, G, and B to display the color. Is performed.

As a manufacturing method of the conventional color filter, the dyeing method is mentioned, for example. This dyeing method first forms a water-soluble polymer material, which is a material for dyeing, on a glass substrate, patterning it into a desired shape by a photolithography step, and then immerses the obtained pattern in a dye bath to obtain a colored pattern. By repeating this three times, R, G, and B color filter layers are formed.

In addition, another method is a pigment dispersion method. This method first forms the photosensitive resin layer which disperse | distributed the pigment on the board | substrate, and patterns this, and obtains a monochromatic pattern. In addition, by repeating this process three times, the color filter layers of R, G and B are formed.

As another method, the electrodeposition method, the method of disperse | distributing a pigment to a thermosetting resin, performing 3 times of printing of R, G, and B, and thermosetting a resin etc. are mentioned.

However, all of the above methods require the same process to be repeated three times in order to color the three colors of R, G, and B, resulting in a high cost, and a problem in that the product yield decreases because the same process is repeated.

As a manufacturing method of the color filter which solved these problems, the method of forming a colored layer (pixel part) by blowing a coloring ink by the inkjet method is proposed (patent document 1). Here, the method of printing convex portions that are bounded in advance by a substance having poor wettability with respect to ink when using ink having good wettability with respect to the glass substrate, or the wettability with ink when using ink having poor wettability with respect to glass is used. A method of forming a pattern in advance with this good material to help the ink to be fixed is disclosed. However, controlling the glass substrate or the convex portion that is the boundary to the ink or ink repellency is effective for controlling the mixing of the pixels and the wettability of the ink, but the shape of the pixel portion itself becomes convex or concave, so that the flatness of the pixel portion is achieved. There was a problem that it could not be obtained. In such a case, there arises a problem that an unbalance occurs in the color density in the pixel, and the display quality of the image is remarkably inferior.

In patent document 2, the method of forming a flattening layer in a pixel part and obtaining the flatness of a pixel part is disclosed. Although the above document discloses a method of exposing at the substrate side and adjusting the degree of curing of the planarization layer according to the thickness of the pixel portion to provide flatness, no imbalance in color concentration in the pixel portion is solved. Moreover, although the method of forming the film-form protective layer by transfer is disclosed by patent document 3, the imbalance of the color density in a pixel part is not eliminated similarly.

Moreover, in patent document 4, the ink which has a coloring pigment and an extender pigment is disclosed as ink which gives flatness of a pixel part. The document also mentions the weight ratio of the resin and the pigment, the weight ratio of the colored pigment and the extender pigment, and the solid content in the ink. However, when the present inventors followed the said document, it turned out that sufficient flatness is not obtained. Patent Literature 5 discloses a method of providing flatness while adjusting density in a pixel portion using light inks. However, the process becomes complicated and sufficient flatness is not obtained.

Moreover, the method of obtaining flatness by controlling the dry state of a pixel part is disclosed (patent document 6, 7, 8). Patent document 6 describes that flatness of the pixel portion is obtained by exposing the ink before drying. In patent document 7, the method of drying at high temperature is described, so that the viscosity of an ink is high. In addition, Patent Document 8 describes a method of adjusting the drying conditions to match the shape of the pixel. However, sufficient flatness is not obtained in the methods of Patent Documents 6 and 7, 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 at the top, but no means for obtaining flatness is disclosed.

In addition, Patent Document 11 discloses a method of repeating the stroke and drying of the ink many times in order to prevent the ink from overflowing from the recess surrounded by the partition wall and mixing with other pixels. In the above method, it is possible to prevent color mixing of the pixel portion and to improve the flatness of the pixel portion, but the process is complicated and is not suitable for actual production.

(Patent Document 1) Japanese Patent Application Laid-Open No. 59-75205

(Patent Document 2) Japanese Patent Application Laid-Open No. 8-304619

(Patent Document 3) Japanese Patent Application Laid-Open No. 10-197719

(Patent Document 4) Japanese Patent Application Laid-Open No. 9-132740

(Patent Document 5) Japanese Patent Application Laid-Open No. 2004-177867

(Patent Document 6) Japanese Patent Application Laid-Open No. 11-142641

(Patent Document 7) Japanese Unexamined Patent Publication No. 2002-372613

(Patent Document 8) Japanese Patent Application Laid-Open No. 2003-266003

(Patent Document 9) Japanese Patent Application Laid-Open No. 2002-148429

(Patent Document 10) Japanese Patent Application Laid-Open No. 2002-156520

(Patent Document 11) Japanese Patent Application Laid-Open No. 2004-325736

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and is a color filter capable of producing a color filter that is excellent in productivity of the color filter, and has a flatness of the pixel portion and a small variation in color density in the pixel portion, and excellent display quality without spots. An object of the present invention is to provide an inkjet ink, a manufacturing method of a color filter using the ink, a color filter obtained by the manufacturing method, and a display device including the color filter.

A first embodiment 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, wherein the color filter inkjet ink is 5 mmHg (0.67) with an average thickness of 1 mm. kPa) and the viscosity of the ink residue obtained by drying for 8 hours at 45 degreeC is 40 mPa * s or more and 4000 mPa * s or less at 25 degreeC, The inkjet ink for color filters is provided.

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

A third embodiment of the present invention provides a color filter, which is produced by the method for producing a color filter according to the second embodiment of the present invention.

A fourth embodiment of the present invention provides a display device comprising the color filter according to the third embodiment of the present invention.

(Effects of the Invention)

According to the present invention, a color filter inkjet ink capable of producing a color filter which is excellent in the productivity of the color filter, and has a flatness in the pixel portion and a nonuniformity in the color density in the pixel portion and excellent display quality without spots, and the color using the ink A manufacturing method of a filter, a color filter obtained by this manufacturing method, and a display device provided with the color filter are provided.

EMBODIMENT OF THE INVENTION Hereinafter, the inkjet ink for color filters, the manufacturing method of a color filter, a color filter, and a display apparatus of this invention are demonstrated in detail.

<Inkjet Ink for Color Filters>

The inkjet ink for color filters of the present invention (hereinafter sometimes referred to as the "inkjet ink of the present invention") is an inkjet ink for color filters containing at least a monomer having a colorant, an organic solvent, and two or more polymerizable groups. The viscosity of the ink residue obtained by drying for 8 hours at 5 mmHg (0.67 kPa) and 45 degreeC conditions with the average thickness of the inkjet ink for color filters is 40 mPa * s or more and 4000 mPa * s or less at 25 degreeC. . 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.

(Liquidity of Ink Balance)

The inkjet ink of the present invention has an organic solvent as an essential component, and the viscosity of the ink residue 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 40 mPa · s or more at 25 ° C. It is characterized by being 4000 mPa * s or less. Here, the average thickness is the thickness calculated by calculating from the container bottom area and the ink volume.

As for the viscosity in 25 degreeC of the said ink remainder, it is more preferable that they are 50 mPa * s or more and 3000 mPa * s or less, It is still more preferable that they are 50 mPa * s or more and 2000 mPa * s or less, It is especially preferable that they are 50 mPa * s or more and 1000 mPa * s or less. If the viscosity of the ink residue is within the above range, the pixel portion (coloring layer) has fluidity even after drying of the organic solvent, so that a flat pixel portion (coloring layer) can be obtained.

The "ink residual part" in this invention means the residue obtained by drying for 8 hours on the conditions of 5 mmHg (0.67 kPa) and 45 degreeC in the state which made the inkjet ink for color filters into 1 mm of average thickness. When measuring the viscosity of the remainder of the ink using a viscoelasticity measuring device, for example, the inkjet ink for color filters is placed in an aluminum saucer so that the average thickness is 1 mm, and vacuum drying (0.67 kPa) is performed at 45 ° C. for 8 hours. The residue (ink residue) obtained can be collected from an aluminum dish using a weak spoon and provided as a sample. Measurement of the viscosity using a viscoelasticity measuring device is described, for example, by Jasco International Co. Ltd. Viscoelasticity measuring device DynAlyser DAS-100 can be used to measure the temperature at 25 ℃ and 1Hz frequency.

You may measure the viscosity of an ink remainder using the 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 to the change in electric field. As an example of the measurement method using the said laser pickup method, first, the inkjet ink for color filters is spinner apply | coated to a glass plate, vacuum drying (0.67 kPa) is performed at 45 degreeC for 8 hours, and this is used as a measurement sample. When the laser light of high intensity (about 0.6 W) is irradiated to the ink remainder of this sample, the sample interface deforms by several nm. Although the amount of deformation is very small, the curvature of the center root is large enough to be detected using light. Here, a YAG laser having a double wave is used as a pump light for causing deformation at the sample interface, and a He-Ne laser having a sufficiently low intensity is used as a probe light for detecting deformation. Since the probe light irradiated on the copper surface receives the deformation curvature of the sample surface, it spreads and returns, and thus, a part of the probe light can be cut and the change in intensity can be obtained to obtain surface deformation information.

When the pump light is turned on and off functionally, the sample surface is harvested and lifted to it, and also returns to its original flat state. In the highly viscous sample, since the deformation takes time, the viscosity is measured from the deformation rate. Also, since the deformation amount is mainly determined by the surface tension, viscosity information can be obtained from the change in signal strength.

Next, each component contained in the inkjet ink of this invention is demonstrated in detail.

(coloring agent)

Although the coloring agent used for the inkjet ink of this invention can use well-known things, such as an organic pigment, an inorganic pigment, and dye, various organic pigments are required since sufficient permeation | concentration density, light resistance, adhesiveness to a board | substrate, and other various tolerances are calculated | required. Is suitable. As a specific example of the said coloring agent, the pigment and dye of Unexamined-Japanese-Patent No. 2005-17716, the pigment of Unexamined-Japanese-Patent No. 2004-361447, or Japan The coloring agent described in Unexamined-Japanese-Patent No. 2005-17521 [0080]-[0088] can be used suitably. Among these, a pigment is especially preferable from the point of the storage stability of a pixel.

Although content of the coloring agent in this invention is not specifically limited, From a viewpoint of obtaining a desired color and density | concentration, the ratio of the coloring agent to an ink remainder is preferably 20 mass% or more, 20-70 mass% is more preferable, , 25-60 mass% are more preferable, and 30-50 mass% is especially preferable.

In this invention, the combination of the pigment of the said base material which is preferable to use together is C. I. pigment red 177 in C. I. pigment red 254, C. I. pigment red 224, C. I. Pigment Yellow 139 or C. I. The combination with pigment violet 23 is listed. C. I. Pigment Yellow 36, C. I. Pigment Yellow 150, C. I. Pigment Yellow 139, C. I. Pigment Yellow 185, C. I. Pigment Yellow 138 or C. I. Combinations with Pigment Yellow 180 are listed. C. I. Pigment Blue 15: 6 lists combinations with C. I. Pigment Violet 23 or C. I. Pigment Blue 60.

The content of C. I. pigment red 254, C. I. pigment green 36, C. I. pigment blue 15: 6 in the pigment at the time of using together in this way is C. I. pigment red 254 60 mass% or more is preferable, and 70 mass% or more is especially preferable. C. I. Pigment Green 36 is preferably at least 50 mass%, particularly preferably at least 60 mass%. C. I. Pigment Blue 15: 6 is preferably at least 80 mass%, particularly preferably at least 90 mass%.

It is preferable that it is a number average particle diameter of 0.001-0.1 micrometer, and, as for the pigment used by this invention, the thing of 0.01-0.08 micrometer is more preferable. When the number average particle diameter of the pigment is 0.001 µm or more, the surface energy of the particles is small, which makes it difficult to aggregate, which facilitates pigment dispersion and makes it easy to maintain the dispersed state stably. Moreover, since the cancellation of the polarization by a pigment does not arise that the number average particle diameter of a pigment is 0.1 micrometer or less, contrast improves and it is preferable. In addition, the "particle diameter" used here means the diameter when the electron microscope photograph image of particle | grains was made into the circle of the same area, and the "number average particle diameter" means the said particle diameter about many particle | grains, Say the mean.

It is preferable to use the said pigment as a dispersion liquid. This dispersion can be manufactured by disperse | distributing the composition obtained by mixing the said pigment, the pigment dispersing agent mentioned later, and an organic solvent previously using a well-known dispersing machine. At this time, in order to provide dispersion stability of a pigment, you may add a small amount of resin. Moreover, it is also possible to manufacture by adding and disperse | distributing the composition obtained by mixing the said pigment and a pigment dispersant beforehand to the monomer mentioned later. There is no restriction | limiting in particular as a dispersing group used when disperse | distributing the said pigment, For example, Asakura Kunizu, "The Dictionary of Pigments", 1st edition, Asakura Bookstore, 2000, Kinder, roll mill, art described on page 438. Known dispersers such as riders, super mills, resolvers, homo mixers, sand mills and the like are listed. Moreover, you may finely grind using frictional force by the mechanical grinding described on page 310 of the document.

(Pigment dispersant)

It is preferable to add a pigment dispersant to the inkjet ink of the present invention in order to obtain dispersion stability of the pigment.

It is preferable to contain a dispersing agent in the range of 0.1-10 mass% with respect to the total mass of an inkjet ink, 0.1-9 mass% is more preferable, The range in 0.1-8 mass% is especially preferable.

Examples of the pigment dispersant include hydroxy group-containing carboxylic acid esters, salts of long chain polyaminoamides and high molecular weight acid esters, salts of high molecular weight polycarboxylic acids, salts of long chain polyaminoamides and polar acid esters, high molecular weight unsaturated esters and polymers. 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 nonylphenyl ether, stearylamine acetate , Pigment derivatives and the like can be used.

As a specific example of the pigment dispersant, the examples described in paragraphs [0021] to [0023] of JP 2005-15672A may be used as suitable ones in 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 not particularly limited as long as the polymerization reaction is possible by active energy rays and / or heat. More preferable are monomers having three or more polymerizable groups (hereinafter sometimes referred to as monomers having three or more functionalities) in view of strength, solvent resistance, and the like. 20 mass% or more is preferable and, as for the ratio of the trifunctional or more than trifunctional monomer to the whole monomer, 30 mass% or more is more preferable. As a trifunctional or more than trifunctional monomer, it is preferable that the viscosity in 25 degreeC is 700 mPa * s or less, and the thing of 200 mPa * s or less is more preferable.

Although there is no restriction | limiting in particular as a kind of polymerizable group, Since the viscosity of a polymerizable monomer itself rises as the number of functional groups increases, it is preferable that the viscosity of functional group itself is low, and acryloyloxy group, methacryloyloxy group, and epoxy group are preferable. Particularly preferred.

As a specific example of a trifunctional or more than trifunctional polymerizable monomer, the trifunctional epoxy group containing monomer of Paragraph No. 0061 of Unexamined-Japanese-Patent No. 2001-350012-0063, and the trifunctional or more trifunctional of Paragraph No. 0016 of Unexamined-Japanese-Patent No. 2002-371216 are mentioned. The acrylate monomer, the methacrylate monomer, and the trifunctional or more than trifunctional monomer described in "the market prospect of reactive monomer" by CMC publication are mentioned. Among these, particularly preferred are trimethylolpropane triacrylate, trimethylolpropane PO (propylene oxide) modified triacrylate, trimethylolpropane EO (ethylene oxide) modified triacrylate, pentaerythritol tetraacrylate, trimethylolpropane tri Although methacrylate, pentaerythritol triacrylate, glycerol polyglycidyl ether, diglycerol polyglycidyl ether, trimethylolpropane polyglycidyl ether, etc. are mentioned, It is not limited to these. Moreover, it is also possible to use together 2 or more types of said trifunctional or more than monomers.

You may use together a monofunctional monomer and a bifunctional monomer suitably in order to reduce the viscosity of an ink remainder and to promote the polymerization reaction of a pixel part. As these monofunctional monomer or bifunctional monomer, For example, the monofunctional epoxy group containing monomer of Paragraph No. of Unexamined-Japanese-Patent No. 2001-350012, and Paragraph No. 0015 of Unexamined-Japanese-Patent No. 2002-371216. Monofunctional or bifunctional acrylate monomers and methacrylate monomers described in -0016, and the 1-2 functional monomers described in "The market prospect of reactive monomer" by CMC publication are mentioned.

Moreover, in order to supplement the strength of a film | membrane or to provide adhesiveness with a board | substrate, you may use together a small amount of high viscosity polyfunctional monomers with a viscosity at 25 degreeC or more, high polar monomers, such as urethane acrylates, oligomers, etc. together. There is no restriction | limiting in particular in the polyfunctional monomer, high polar monomer, and oligomer which are preferable at the point of 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 (E.g., Aronix M-1000, M-1200, M-1210, M-1600 from Toagosei Co., Ltd.), polyester acrylate (e.g., Aronix M from Toagosei Co., Ltd.) -6100, M-6200, M-6250, M-6500, M-7100, M-7300K, M-8030, M-8060, M-8100, M-8530, M-8560, M-9050) do. The addition amount of these combined monomers can be suitably adjusted in the range which the viscosity of an ink remainder becomes 4000 mPa * s or less at 25 degreeC.

20 mass% or more is preferable in ink solid content, 30 mass% or more is more preferable, and 40 mass% or more of the usage-amount of a monomer is more preferable. When the amount of the monomer used is 20% by mass or more, since the polymerization of the pixel portion is sufficient, it is difficult to generate a scar due to the lack of film strength of the pixel portion, or the reticulation hardly occurs when the transparent conductive film is applied. Solvent resistance at the time of forming an oriented film improves.

In order to make the viscosity of an ink remainder 40 mPa * s or more and 4000 mPa * s or less at 25 degreeC, the following method is enumerated.

For example, using a monomer of a lower viscosity as a monomer to be used is mentioned. In addition, it is enumerated that as the binder component, the amount of high molecular weight or high polar resin is reduced and the high viscosity component in the ink is reduced. Moreover, the method of selecting the dispersing agent optimal for a pigment and reducing the viscosity of a pigment dispersion liquid is mentioned. Among them, it is particularly effective to use low viscosity monomers. It is preferable to use the monomer which has three or more polymerizable groups from the point which gives the film strength of a pixel.

(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. However, water-insoluble organic solvents are preferable for the following reasons.

When the solvent is a water-soluble organic solvent, the binder and the monomer to be used need to be water-soluble. Since these water-soluble binders and monomers have a polar group, the viscosity of the ink remainder after removing the water-soluble organic solvent tends to be high, making it difficult to flatten the shape of the color filter pixel.

Although there is no restriction | limiting in particular as a water-insoluble organic solvent, Since the low boiling point and the organic solvent which is easy to remove from an inkjet ink evaporate quickly also on an inkjet head normally, it raises easily the viscosity of ink on a head, and deteriorates discharge property. It is often accompanied by. In order to prevent drying of the ink in an inkjet head, it is preferable that the boiling point in normal pressure contains the organic solvent which is 160 degreeC or more at least.

40 mass% or more is preferable, as for the ratio which these organic solvents occupy in the inkjet ink of this invention, 50 mass% or more is more preferable, and its 60 mass% or more is more preferable. If the proportion of the organic solvent is 40% by mass or more, the amount of ink to be transferred into one pixel increases, so that wetness and spread of the ink in the pixel may not be insufficient, thereby improving flatness.

Moreover, it is preferable that the inkjet ink of this invention is comprised from the compound which 50 mass% or more of the organic solvent containing 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 high-boiling solvents, alkylene glycol acetate, alkylene glycol diacetate, and the like described in paragraphs [0031] to [0037] of JP 2000-310706 A. do. 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, di Ethylene glycol monobutyl ether, 1,3-butanediol diacetate, dipropylene glycol-n-propylether acetate, propylene carbonate, diethylene glycol monobutyl ether acetate, dipropylene glycol-n-butylether acetate and the like are particularly preferable.

The upper limit of the boiling point of the organic solvent is not particularly limited as long as it is possible to manufacture the color filter by the inkjet method using the inkjet ink of the present invention, but the operability in the manufacturing process of the ink and the manufacturing process of the color filter is not limited. From a viewpoint, the liquid chain organic solvent of comparatively low viscosity is preferable at normal temperature (20 degreeC) of boiling point 290 degrees C or less, Preferably it is 280 degrees C or less.

(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 a polymerization initiator, a photoinitiator is used when superposing | polymerizing a pixel part with an active energy ray, and a thermal polymerization initiator is used when superposing | polymerizing a pixel part with heat. As a photoinitiator, the thing of Paragraph No. [0079]-[0088] of Unexamined-Japanese-Patent No. 2006-28455 is mentioned, for example, As a preferable specific example, 2-trichloromethyl-5- (p-styryl Styryl) -1,3,4-oxadiazole or 2,4-bis (trichloromethyl) -6- [4 '-(N, N-bisethoxycarbonylmethylamino) -3'-bromo Phenyl] -s-triazines are listed.

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

Classification by chemical structure includes ketone peroxide, peroxy ketal, hydroperoxide, dialkyl peroxide, diacyl peroxide, peroxy ester, peroxydicarbonate and the like. 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-trimethyl cyclohexane, t-butylperoxy benzoate, di-t-butylperoxy benzoate, di-t-butylperoxy Isophthalate, t-butylperoxy acetate, t-hexylperoxy benzoate, t-butylperoxy-3,5,5-trimethyl hexanoate, t-butylperoxy laurate, t-butylperoxy isopropyl Monocarbonate, t-butylperoxy-2-ethylhexyl monocarbonate, 2,5-bis (m-toluylperoxy) hexane, 2,5-dimethyl-2,5-bis (benzoylperoxy) hexane, t- Hexylperoxy isopropyl monocarbonate,

t-butylperoxy isobutyrate, 1,1,3,3-tetramethyl butylperoxy-2-ethyl hexanoate, t-hexylperoxyisopropyl monocarbonate, 2,5-dimethyl-2,5-bis (2-ethylhexanoylperoxy) hexane, t-butylperoxy-2-ethylhexanoate, t-butylperoxymaleic acid, cyclohexanone peroxide, methylacetoacetate peroxide, methylhexanone peroxide, Acetylacetone peroxide, 1,1-bis (t-hexylperoxy) cyclohexane, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, 1,1-bis (t -Butyl peroxy) -2-methylcyclohexane, 1,1-bis (t-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-butylhydro peroxide and the like are preferred. 2,2-bis (4,4-di-t- Butylperoxy cyclohexyl) peroxy the cake talgye compounds, peroxy ester compounds such as Dia silpeo oxide compounds, t- butyl peroxybenzoate, such as benzoyl peroxide, such as propane is preferred.

Moreover, as said azo-type compound, the compound of Paragraph No. [0021]-[0023] of Unexamined-Japanese-Patent No. 5-5014 is mentioned, for example. Among these compounds, the compound is preferably a compound having a high decomposition temperature, stable at room temperature, and decomposing upon application of heat to generate radicals to form a polymerization initiator. Among organic peroxide compounds or azo compounds (thermal polymerization initiators), those having a relatively high half-life temperature (preferably at least 50 ° C, more preferably at least 80 ° C) do not change the viscosity of the composition over time. It may be suitably configured, and for example, azobis (cyclohexane-1-carbonitrile) and the like are listed as preferred thermal polymerization initiators.

As content of a photoinitiator and / or a thermal 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 a polymerization initiator can be sufficiently exhibited. If the content of the polymerization initiator is 20% by mass or less, the change in viscosity of the inkjet ink over time is suppressed, or the coloration by the decomposition product of the polymerization initiator is prevented. Can be prevented or done.

These initiators can also be used 1 type or in combination of 2 or more types.

In addition to the polymerization initiator, a binder, a surfactant, other additives, or the like may be used in combination within the range in which the ink residue does not lose fluidity at 25 ° C. As an example of the binder used together, the binder resin of Paragraph No. [0015]-[0030] of Unexamined-Japanese-Patent No. 2000-310706, and Paragraph No. [0041]-[0050] of Unexamined-Japanese-Patent No. 2001-350012 Binders and the like.

As an example of surfactant, Paragraph No. of Unexamined-Japanese-Patent No. 7-216276, surfactant disclosed in Unexamined-Japanese-Patent No. 2003-337424, and Unexamined-Japanese-Patent No. 11-133600 are suitable. Listed. As for content of surfactant, 5 mass% or less is preferable with respect to inkjet ink whole quantity.

As other additives, other additives described in Paragraph No. [0058]-[0071] of Unexamined-Japanese-Patent No. 2000-310706 are mentioned.

<Color filter and manufacturing method thereof>

The manufacturing method of the color filter of this invention is characterized by forming the colored layer by applying the droplet of the inkjet ink of this invention to the recessed part enclosed by the partition formed on the board | substrate by the inkjet method.

The manufacturing method of the color filter of this invention provides the process of providing the colored layer by providing the inkjet ink of this invention mentioned above to the recessed part enclosed by the partition by the inkjet method (henceforth a "colored layer formation process." Further comprising a curing step of curing at least one colored layer formed by irradiation of an active energy ray or a colored layer of a desired color, after the formation of both colored layers of a desired color; As needed, other processes, such as a baking process, can be provided and comprised.

In addition, a partition is previously formed on the board | substrate before a colored layer formation process, The detail of the formation method of a partition is mentioned later.

Colored layer formation process

A colored layer formation process forms the colored layer by giving the inkjet method the droplet of the inkjet ink of this invention to the recessed part between partitions (dark separation wall). This colored layer consists of colored pixels, such as red (R), green (G), and blue (B), which constitute a color filter.

Formation of the colored layer is performed by injecting inkjet ink for forming colored pixels (e.g., pixel patterns of RGB tricolor) into recesses enclosed by the partitions formed on the substrate as described above to form a plurality of pixels of two or more colors. It can be configured to be configured.

As for the inkjet method, known methods such as a method of thermosetting ink, a photocuring method, and a method of forming a transparent aqueous phase layer on a substrate in advance and then performing the method can be used.

There is no restriction | limiting in particular about the shape of a color filter pattern, As a black matrix shape, it may be a general stripe form, lattice form, or delta arrangement form.

As the inkjet method, a method of controlling the electric field by continuously spraying charged inkjet ink, intermittently injecting ink using a piezoelectric element, intermittently ejecting ink by heating the ink, and the like The method of can be adopted.

As the injection conditions of the inkjet ink, it is preferable from the viewpoint of injection stability that the inkjet ink is heated to 30 to 60 ° C to reduce the ink viscosity to inject. Since inkjet inks generally have higher viscosity than aqueous inks, the variation in viscosity due to temperature fluctuation is large. It is important to keep the inkjet ink temperature as constant as possible, since the viscosity fluctuation is likely to greatly affect the droplet size and the droplet ejection speed and cause image quality deterioration.

A well-known thing can be applied to an inkjet head (henceforth simply a head), and a continuous type and a dot on demand type can be used. Among the dot on demand types, a type having a movable valve as described in Japanese Patent Laid-Open No. Hei 9-323420 is preferable because of the discharge in the thermal head. In the piezo head, for example, heads described in European Patent A277,703, European Patent A278,590 and the like can be used. Among them, the piezo head is more preferable because the influence of heat on the inkjet ink can be reduced and the range of choice of the usable organic solvent is wide. The head preferably has a temperature control function so as to manage the temperature of the ink. It is preferable to set the injection temperature so that the viscosity at the time of injection may be 5-25 mPa * s, and to control ink temperature so that the fluctuation range of a viscosity may be within +/- 5%. Moreover, it is preferable to operate at 1-500 kHz as a drive frequency. The shape of the nozzle does not necessarily need to be circular, and does not stick to a mold such as an ellipse or a rectangle. It is preferable that a nozzle diameter is the range of 10-100 micrometers. In addition, although the opening itself of a nozzle is not necessarily limited to a round shape, in this case, a nozzle diameter assumes the circle equivalent to the area of the said opening, and makes it the diameter.

The form of the color filter in the present invention is preferably composed of a group consisting of three colored layers by blowing inks of RGB three colors.

In this invention, after removing the organic solvent contained in a droplet and making it an ink remainder, the process of irradiating an active energy ray to the said ink remainder (henceforth a 1st hardening process) and / or the said ink remainder You may superpose | polymerize the said ink remainder and form a colored layer by the process of heating (Hereinafter, it may be called a 2nd hardening process.). Further, when the temperature at which the thermal polymerization of the ink remainder is started is T 占 폚, preheating (hereinafter sometimes referred to as a preheating step) is performed at a temperature below T 占 폚 to remove the organic solvent contained in the droplets. After making it into the ink remainder, the said ink remainder may be polymerized by the process of irradiating an active energy ray to the said ink remainder, and / or the process of heating the said ink remainder at the temperature of T degreeC or more, and a colored layer may be formed.

Hereinafter, a 1st hardening process, a 2nd hardening process, and a preheating process are demonstrated.

First Curing Process

The process (1st hardening process) which irradiates and hardens an active energy ray to the at least 1 color layer formed in the said colored layer formation process can be provided. In the first curing step, the 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 every time one color layer is formed, or may be performed after forming a plurality of color layers.

Curing of the inkjet ink according to the present invention, such as R, G, and B, is performed by performing an exposure treatment to promote polymerization curing using an energy source that emits an active energy ray in a wavelength region corresponding to the photosensitive wavelength of the ink.

As the energy source, for example, the above-described polymerization initiators such as ultraviolet rays, deep ultraviolet rays, g-rays, h-rays, i-rays, KrF excimer laser light, ArF excimer laser light, electron beams, X-rays, molecular beams or ion beams may be used. It can select and use appropriately. Specifically, a light source emitting active light belonging to a wavelength range 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 Can be suitably carried out using a xenon lamp, a chemical lamp or the like. Preferred light sources include LEDs, high pressure mercury lamps, and metal halide lamps.

As irradiation time of an active energy ray, although it can set suitably according to the combination of a monomer and a polymerization initiator, it can be set as 1 to 30 second, for example.

Second Curing Process

In the manufacturing method of the color filter of this invention, the process (2nd hardening process) which hardens all the colored layers of the desired color containing red (R), green (G), and blue (B) by heat can be provided. . As mentioned above, by providing the said 1st hardening process and providing a 2nd hardening process, the manufacturing efficiency of a color filter and display characteristics can be made compatible. Moreover, you may harden only by a 2nd hardening process.

In this process, the colored layer and the partition which consist of desired color are formed, and after performing said 1st hardening process, heat processing (so-called baking process) can be performed and hardening by heat can be performed. That is, the board | substrate with which the colored layer and the partition wall which were photopolymerized by light irradiation can be heated in an electric furnace, a dryer, etc., or can be heated by irradiating an infrared lamp.

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

Moreover, in the manufacturing method of the color filter using the inkjet ink of this invention, you may form a preheating process, before superposing | polymerizing a pixel part by exposure and / or heat processing of an active energy ray. Although the heating temperature in a preheating process does not have a restriction | limiting in particular, When the temperature which thermal-polymerization of a pixel part starts is made into T degreeC, the temperature at which polymerization of a pixel part does not occur below T degreeC is preferable, and 50 degreeC or more and 100 degrees C or less. More preferably, 60 degreeC or more and 90 degrees C or less are more preferable. By adding the above process, evaporation of the organic solvent in the pixel portion is promoted, and the color filter can be efficiently produced. In addition, since the viscosity of the ink residue is lowered by heat, higher fluidity is obtained and the color filter having a high flatness pixel portion. It is possible to obtain.

In the preliminary heating step, as long as the ink residue has fluidity as in the present invention, not only the ink polymerized by heat but also the ink polymerized by light may be effective. In the case of an ink polymerized by light, the temperature T at which the ink starts thermal polymerization means a temperature at which a photopolymerization initiator is decomposed by heat to initiate a polymerization reaction, or a temperature at which the monomer itself is decomposed by heat to initiate a polymerization reaction. do.

Although the time of the said preheating process does not have a restriction | limiting in particular, It is preferable to carry out for 1 to 5 minutes.

The temperature T can be obtained as follows.

The ink is heated, the polymerization of the ink is started by heating, and the temperature at which the gelation of the ink is observed is set to T. More specifically, 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 is set to T.

In the manufacturing method of the color filter using the inkjet ink of this invention, it is preferable to perform the preheating process, a 1st hardening process, and a 2nd hardening process within 24 hours from the said colored layer formation process, and it is more preferable to carry out within 12 hours. It is more preferable to carry out within 6 hours. By forming the colored layer from the final curing step (second curing step) within 24 hours, aggregation of pigments in the ink, precipitation of various binders, and the like can be prevented and the surface shape of the pixel can be improved.

(septum)

In this invention, the colored layer is formed by giving the inkjet ink droplet of this invention by the inkjet method to the recessed part enclosed by the partition formed on the board | substrate. Any of these barrier ribs may be used. However, when the color filter is manufactured, it is preferable that the barrier rib has a light shielding function having a black matrix function. The partition wall may be manufactured by the same material and method as the known black matrix for color filters. For example, paragraphs [0021] to [0074] of Japanese Patent Application Laid-Open No. 2005-3861, the black matrix described in paragraphs [0012] to [0021] of Japanese Patent Application Laid-Open No. 2004-240039, and Japanese Patent The paragraphs [0015]-[0020] of Unexamined-Japanese-Patent No. 2006-17980, the black matrix for inkjets, etc. of Paragraph No.-0009-[0044] of Unexamined-Japanese-Patent No. 2006-10875 are mentioned.

Among the above 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 formed by forming a resin layer having at least light shielding properties on a base member, and can be pressed onto a substrate to transfer the resin layer having light shielding properties onto the substrate.

The photosensitive resin transfer material is preferably formed using the photosensitive resin transfer material described in JP-A-5-72724, that is, an integral film. As an example of the structure of the said integral film, a branch body / thermoplastic resin layer / intermediate | middle layer / photosensitive resin layer (In this invention, "photosensitive resin layer" means resin which can be hardened by light irradiation, and when it has light-shielding property, The resin layer which has light shielding property ", and when it is colored by a desired color is also called the" colored resin layer ") / the structure which laminated | stacked the protective film in this order is mentioned.

As for a branch member constituting the photosensitive resin transfer material, a thermoplastic resin layer, an intermediate layer, a protective film, and a manufacturing method of the transfer material, those described in paragraphs [0023] to [0066] of JP 2005-3861 are suitable. Listed.

In addition, the barrier rib may be subjected to ink repellent treatment in order to prevent mixing of inkjet ink. Regarding the ink repellent treatment, for example, (1) a method of incorporating ink repellent material into a partition wall (see, for example, Japanese Unexamined Patent Publication No. 2005-36160), and (2) a method of newly forming an ink repellent layer. (See, for example, Japanese Patent Application Laid-open No. Hei 5-241011), (3) A method of imparting ink repellency by plasma treatment (see, for example, Japanese Patent Application Laid-Open No. 2002-62420), (4) The method of apply | coating ink repellent material on the wall surface of a partition (for example, refer Unexamined-Japanese-Patent No. 10-123500) etc. is mentioned, Especially (3) Ink repelling process by plasma to the partition formed on the board | substrate. The method of carrying out is preferable.

As described above, after the colored region (colored pixel) and the partition are formed to produce the color filter, the overcoat layer can be formed so as to cover the entire surface of the colored region and the partition for the purpose of improving the resistance.

The overcoat layer can flatten the surface while protecting colored regions and partitions such as R, G, and B. However, it is preferable not to form in the point which process number increases.

An overcoat layer can be comprised using resin (made by OC), and acrylic resin composition, an epoxy resin composition, a polyimide resin composition, etc. are mentioned as resin (made by OC). Especially, since the resin component of the photocurable composition for color filters is excellent in transparency in a visible light region normally has acrylic resin as a main component, and is excellent in adhesiveness, an acrylic resin composition is preferable. As an example of an overcoat layer, Paragraph No. [0018]-[0028] of Unexamined-Japanese-Patent No. 2003-287618 are mentioned, Optomer SS6699G by JSR company is mentioned as a commercial item made from an overcoat.

The color filter of the present invention is manufactured by the above-described method for manufacturing the color filter of the present invention, and is used for, for example, a portable terminal such as a television, a personal computer, a liquid crystal projector, a game machine, a mobile phone, a digital camera, a car navigation system, and the like. It can be suitably applied 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 inkjet ink for color filters of the present invention.

<Display device>

The display device of the present invention is not particularly limited as long as the display device includes the color filter of the present invention described above, and examples thereof include a liquid crystal display device, a plasma display display device, an EL display device, and a display device such as a CRT display device. The definition of the display device and the explanation of each display device are described in, for example, "Electronic display device" by Akio Sasaki, issued by Industrial Co., Ltd. in 1990, and "Display device (by Miki Ibukisu, Industrial Books). Issued in 1989).

Among the display devices of the present invention, liquid crystal display devices are particularly preferable. The liquid crystal display device is described, for example, in "next-generation liquid crystal display technology" (Tatsuo Uchida editorial, published in 1994). There is no restriction | limiting in particular in the liquid crystal display device which can apply this invention, For example, it can apply to the liquid crystal display device of various systems described in the said "next-generation liquid crystal display technology." The present invention is particularly effective for the liquid crystal display device of the color TFT type among them. About the liquid crystal display device of a color TFT system, it describes in a "color TFT liquid crystal display (public publication Co., Ltd. 1996 issuance), for example." In addition, the present invention can be applied to a liquid crystal display device having an enlarged viewing angle, such as a transverse 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 Technology and the Latest Trends in the Market" (Toray Research Center Research Research, 2001).

In addition to the color filter, the liquid crystal display is composed of various members such as an electrode substrate, a polarizing film, a retardation film, a backlight, a spacer, and a viewing angle compensation film. For these members, for example, the '94 liquid crystal display peripheral materials and chemical market (issued by Token Taro Co., Ltd. CMC 1994), and the current status and future prospects of the 2003 liquid crystal display market (the lower volume) , Fujikimera Research Institute, 2003).

The display device according to the present invention is electrically controlled irefringence (ECB), twisted nematic (TN), in-plane switching (IPS), ferroelectric liquid crystal (FLC), optimically compensatory bend (OCB), supper twisted nematic (STN), and VA (VA). Various display modes, such as Vertically Aligned), HAN (Hybrid Aligned Nematic), and GH (Guest Host), can be adopted. The display device of the present invention is characterized by having the above-described color filter, whereby when mounted on a television or a monitor, there is no display unevenness, and a wide color reproduction area and a high contrast ratio can be achieved. The display device of the present invention can also be suitably used for a display device for a large screen such as a television monitor.

Hereinafter, exemplary embodiments of the present invention will be described. However, the present invention is not limited to these.

<1> 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 is 5 mmHg (0.67 kPa) at 45 ° C with an average thickness of 1 mm. The viscosity of the ink residue obtained by drying for 8 hours on condition of 40 mPa * s or more and 4000 mPa * s or less at 25 degreeC is inkjet ink for color filters.

The viscosity of the <2> above-mentioned ink remainder is 50 mPa * s or more and 2000 mPa * s or less at 25 degreeC, The inkjet ink for color filters as described in <1> characterized by the above-mentioned.

<3> The inkjet ink for color filters according to <1>, wherein the monomer has three or more polymerizable groups.

<4> The inkjet ink for color filters according to <1>, wherein the colorant is a pigment.

The ratio of the coloring agent in a <5> above-mentioned ink remainder is 20 mass% or more, The inkjet ink for color filters as described in <1> characterized by the above-mentioned.

The ratio of the <6> above-mentioned organic solvent is 40 mass% or more, The inkjet ink for color filters as described in <1> characterized by the above-mentioned.

The <7> above-mentioned monomer has a viscosity of 700 mPa * s or less at 25 degreeC, and has three or more polymerizable groups, The inkjet ink for color filters as described in <1> characterized by the above-mentioned.

<8> The said monomer has a viscosity of 200 mPa * s or less at 25 degreeC, and has three or more polymerizable groups, The inkjet ink for color filters as described in <1> characterized by the above-mentioned.

The <9> polymerizable group is any one selected from the group containing an epoxy group, an acryloyloxy group, and a methacryloyloxy group, The inkjet ink for color filters as described in <1> characterized by the above-mentioned.

<10> The inkjet ink for color filters 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).

The ink filter ink for color filters as described in <1> characterized by further containing a <11> 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 the above-mentioned.

The ink filter ink for color filters as described in <1> characterized by further containing a <13> surfactant.

<14> The manufacturing method of the color filter characterized by forming the colored layer by giving the droplet of the inkjet ink for color filters as described in said <1> by the inkjet method to the recessed part enclosed by the partition formed on the board | substrate.

<15> After removing the organic solvent contained in the said droplet and making it into an ink residue, the said ink remainder is polymerized by the process of irradiating an active energy ray to the said ink remainder, and / or heating the said ink remainder, and a colored layer The manufacturing method of the color filter as described in <14> characterized by forming a.

<16> When the temperature at which the thermal polymerization of the ink residue is initiated is set to T ° C., preliminary heating is performed at a temperature below T ° C. to remove the organic solvent contained in the droplets to make the ink remainder. The method of manufacturing a color filter according to <15>, wherein a colored layer is formed by polymerizing the remaining ink residue by a step of irradiating an active energy ray and / or heating the remaining ink residue at a temperature of T ° C or higher.

<17> The color filter manufactured by the manufacturing method of the color filter as described in <14>.

<18> The display apparatus characterized by including the color filter as described in <17>.

As for the indication of the Japan patent application 2006-100742, the whole is taken in into this specification by reference.

All documents, patent applications, and technical specifications described herein are incorporated by reference in this specification to the same extent as if the individual documents, patent applications, and technical specifications were specifically and individually recorded by reference.

Example

An Example is given to the following and this invention is demonstrated to it further more concretely. Materials, reagents, ratios, instruments, operations, and the like shown in the following examples can be changed as appropriate without departing from the scope of the present invention. Therefore, the scope of the present invention is not limited to the specific example shown below. In addition, in the following Examples, unless otherwise indicated, "%" and "part" represent the "mass%" and the "mass part", and molecular weight shows a weight average molecular weight.

Experimental Example 1

[Production of thick color composition for forming partition wall]

The thickening composition K1 first weighs K pigment dispersion 1 and propylene glycol monomethyl ether acetate in the amounts shown in Table 1, mixes at a temperature of 24 ° C. (± 2 ° C.), stirred at 150 rpm for 10 minutes, and then, Positive methyl ethyl ketone, binder 2, hydroquinone monomethyl ether, DPHA liquid, 2,4-bis (trichloromethyl) -6- [4 '-(N, N-bisethoxycarbonylmethyl) amino-3 '-Bromophenyl] -s-triazine and Surfactant 1 were weighed, added in this order at a temperature of 25 ° C. (± 2 ° C.), and obtained by stirring at 150 rpm at a temperature of 40 ° C. (± 2 ° C.) for 30 minutes. . In addition, the quantity of Table 1 is a mass part, and consists of the following compositions in detail.

<K Pigment Dispersion 1>

Carbon black (Nipex35 from Degussa) 13.1%

Dispersant 1 (compound 1 below) 0.65%

6.72% of polymer (benzyl methacrylate / methacrylic acid = random copolymer of 72/28 molar ratio, molecular weight 370,000)

Propylene glycol monomethyl ether acetate 79.53%

<Binder 2>

27% polymer (benzyl methacrylate / methacrylic acid = 78/22 molar ratio random copolymer, molecular weight 3.8 million)

Propylene glycol monomethyl ether acetate 73%

<DPHA liquid>

Dipentaerythritol hexaacrylate

(Polymerization inhibitor MEHQ 500ppm, Nippon Kayaku Co., Ltd. product, brand name: KAYARAD DPHA) 76%

Propylene glycol monomethyl ether acetate 24%

<Surfactant 1>

Structure 1 to 30%

70% methyl ethyl ketone

(Formation of bulkhead)

The alkali-free glass substrate was washed with a UV cleaner, and then brush-washed with a cleaner, followed by ultrasonic cleaning with ultrapure water. The substrate was heat-treated at 120 ° C. for 3 minutes to stabilize the surface state.

After cooling the board | substrate and adjusting the temperature to 23 degreeC, the deep color composition K1 prepared as mentioned above was apply | coated with the glass substrate coater (FAS Asia product, brand name: MH-1600) which has a slit-shaped nozzle. Subsequently, a part of the solvent was dried for 30 seconds with VCD (Vacuum Dryer, manufactured by Tokyo Oka Co., Ltd.) to remove the fluidity of the coating layer, and then prebaked at 120 ° C. for 3 minutes to give a thick color composition layer having a thickness of 2 μm. K1 was obtained.

The exposure mask surface and the deep color composition layer K1 in a state where the substrate and the mask (a quartz exposure mask having an image pattern) are upright with a proxy meter type exposure machine (manufactured by Hitachi High-Tech.Electronics Engineering Co., Ltd.) having an ultra-high pressure mercury lamp. The distance between them was set to 200 µm, and the pattern was exposed to an exposure dose of 300 mJ / cm 2 under a nitrogen atmosphere.

Next, pure water was sprayed with a shower nozzle to uniformly wet the surface of the deep color composition layer K1, and then a KOH-based developer (containing a non-ionic surfactant, trade name: CDK-1, 100 times diluted with FUJIFILM Electronic Materials) was used. Shower development was carried out at 23 ° C. for 80 seconds at a flat nozzle pressure of 0.04 MPa to obtain a patterned image. Subsequently, ultrapure water was sprayed at a pressure of 9.8 MPa with an ultra-high pressure cleaning nozzle to remove residue, and post exposure was performed at the side where the dark color composition layer K1 of the glass substrate was formed at an exposure dose of 2500 mJ / cm 2 under an atmosphere to obtain a partition having an optical density of 3.9. .

[Inking Plasma Treatment]

The ink repellent plasma process was performed on the board | substrate with which the partition was formed using the parallel plate type plasma processing apparatus of a cathode coupling system on the following conditions.

Gas Used: CF ₄

Gas flow rate: 80sccm

Pressure: 40Pa

RF power: 50 W

Processing time: 30sec

Experimental Example 2

Preparation of Pigment Dispersion

<Pigment Dispersion for G (G1)>

The pigment dispersant 1 (compound 1) and the solvent (1,3-butanediol diacetate) (hereinafter abbreviated as 1,3-BGDA) are shown in Table 2 to brominated phthalocyanine green (C. I. pigment green 36). After mixing, premixing and dispersing for 9 hours at 9m / s circumferential speed using a motor mill M-50 (manufactured by EIGER Japan Co., Ltd.) using zirconia beads with a diameter of 0.65 mm, G pigment dispersion (G1) Prepared.

<Other pigment dispersions>

In the pigment dispersion (G1) for G of Experimental Example 2, except that the pigment and other components were blended as shown in Table 2, in the same manner as the pigment dispersion (G1) for G, pigment dispersion (G2) for G, and R for Pigment dispersion liquid (R1), (R2), pigment dispersion liquid for B (B1), (B2) were prepared.

Experimental Example 3

Preparation of coloring ink for pixels

<Inkjet Ink for B>

The following components were mixed, and after stirring at 25 degreeC for 30 minutes, it was confirmed that there were no insolubles, and the 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

Aronix M-309 (trimethylolpropane triacrylate, viscosity: 85 mPa · s at 25 ° C.) Toagosei Co., Ltd. Part 12.0 of the product

0.1 part of surfactant

Thermal initiator V-40 (Azobis (cyclohexane-1-carbonitrile), manufactured by Wako Pure Chemical Industries) 0.6 parts

Next, the said monomer liquid was added slowly, stirring the following pigment dispersion liquid, and it stirred at 25 degreeC for 30 minutes, and prepared inkjet ink for B (ink B-1).

28.0 parts of pigment dispersion liquid for B (B1)

28.0 parts of pigment dispersion liquid for B (B2)

<Measurement of Ink Properties>

The viscosity of the ink B-1 was determined by Toki Sangyo Co., Ltd. The viscosity was 8.5 mPa * s when it measured on condition of the following using the E-type viscosity meter (RE-80L) of the product.

(Measuring conditions)

Rotor: 1 ° 34 '× R24

Measurement time: 2 minutes

Measurement temperature: 25 ℃

In addition, the surface tension of the ink B-1 was determined by Kyowa Interface Science Co., Ltd. When measured using the surface tension meter of the product (FACE SURFACE TENSIOMETER CBVB-A3), the surface tension was 25.4 mN / m (at 25 ℃).

<Measurement of Viscosity of Ink Residue>

First, the average thickness of the B inkjet ink (ink B-1) is 1 mm, placed in an aluminum saucer, and air dried, followed by vacuum drying (0.67 kPa) at 45 ° C. for 8 hours. It collected from the plate and used as the sample. This sample was taken from Jasco International Co. Ltd. It measured at the measurement temperature of 25 degreeC and the frequency of 1 Hz using the viscoelasticity measuring instrument DynAlyser DAS-100 of the product. The viscosity at 25 degrees C of the obtained ink remainder was 1400 mPa * s.

Experimental Example 4

Formation of the pixel portion by the inkjet method

Next, using the ink B-1 described above, Dimatix Co., Ltd. was used in the region (concave portion surrounded by the convex portion) divided by the partition wall of the color filter substrate obtained in Experimental Example 1. Ink was ejected by the inkjet head (SE-128, head temperature of 28 DEG C) of the product until the desired density was obtained, thereby producing a color filter having a B pattern. The color filter after image coloring was hardened completely with a partition and a pixel by baking for 30 minutes in 230 degreeC oven. In addition, the height of the partition after hardening and the level difference of the pixel part were 0.2 micrometer.

<Evaluation of Flatness of Pixel Part>

The shape of the pixel portion was observed using a non-contact surface shape measuring device New View 6K (manufactured by Zygo Co., Ltd.) to calculate the profile of the surface shape. The flatness was evaluated by the following criteria using the lowest part A and the highest part B as the height difference (B-A), so that it became 0.03 micrometer and the pixel part which was very excellent in flatness was obtained.

(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 ≤ B-A

Experimental Example 5

In Ink B-1 of Experimental Example 3, except that the monomer component in the ink was changed as shown in Table 3, ink B ink (Inks B-2 to B-11) for B was prepared in the same manner as Ink B-1. did. In addition, the physical properties of the ink were evaluated in the same manner. The results are shown in Table 3.

<Formation of pixel portion and evaluation of flatness>

The ink of the said ink B-2-11 was used and the formation and flatness evaluation of the blue pixel part were performed in accordance with the method of Experimental example 4. The results are shown in Table 4.

Experimental Example 6

Manufacturing of color filters and display devices

<Preparation of inkjet ink for R and inkjet ink for G>

In the inkjet ink for ink B (ink B-1) of Experimental Example 3, except that the pigment dispersion and other components were blended as shown in Table 5, the inkjet ink for R was used in the same manner as the inkjet ink for ink B (ink B-1). Ink (Ink R-1) and Inkjet Ink for G (G-1) were prepared.

In addition, when the viscosity of the ink residue was measured in the same manner as in Experimental Example 3, the viscosities at 25 ° C. of the ink residue of the ink R-1 and the ink G-1 were 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 same manner as in Experimental Example 4, in the region divided by the partition wall of the color filter substrate (the concave portion surrounded by the convex portion). Using an inkjet recording apparatus, ink was ejected until a desired density was obtained, thereby producing Color Filter 1 consisting of R, G, and B patterns. The color filter after image coloring was hardened completely with a partition and each pixel by baking for 30 minutes in 230 degreeC oven. 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 (B-A) of the pixel portion: 0.05 占 퐉

G pixel portion: Height difference (B-A) of A pixel portion: 0.04 탆

<Manufacture of display device>

A transparent electrode of indium tin oxide (ITO) was further formed on the R pixel, the G pixel and the B pixel of the color filter substrate obtained above, and the partition wall by sputtering. In ITO sputtering, no reticulation occurred in the R pixel, the G pixel, and the B pixel. Separately, a glass substrate was prepared as a counter substrate, and patterned for the PVA mode on the transparent electrode and the counter substrate of the color filter substrate, respectively.

The photospacer was formed in the part corresponding to the upper part of the partition on the transparent electrode of said ITO, and the alignment film which consists of polyimide was further formed on it.

Thereafter, a sealant of an ultraviolet curable resin is applied by a dispenser method to a position corresponding to a partition frame formed around the pixel group of the color filter by a dispenser method, the liquid crystal for PVA mode is dropped, and then bonded to the opposite substrate. The bonded substrate was subjected to UV irradiation, followed by heat treatment to cure the sealant. The polarizing plate HLC2-2518 by Sanritz Corporation was attached to both surfaces of the liquid crystal cell obtained in this way. Subsequently, the backlight of the cold cathode tube was comprised, and it was arrange | positioned at the side used as the back surface of the liquid crystal cell in which the said polarizing plate was formed, and it was set as the liquid crystal display device 1. As shown in FIG.

Experimental Example 7

In the preparation of the RGB inkjet ink of Experimental Example 6, except that the pigment dispersion and other components were blended as shown in Tables 6 to 7, the same procedures as those in Experimental Example 6 were carried out with Inks R-3 to 8 and Inks G-3 to 8 was prepared.

Here, the number of polymerizable groups of Aronix M-309, NK ester A-DPH, Denacol EX-314, Aronix M-220 is 3, 6, 3 and 2, respectively.

<Binder 3>

45% of polymer (benzyl methacrylate / methacrylic acid = random copolymer of 70/30 molar ratio, molecular weight 1.0 million)

Propylene glycol monomethyl ether acetate 55%

Table 8 shows the results of evaluating the flatness of the pixel portion formed in the same manner as in Experimental Example 6 using the above ink R-3-8 and G-3-8. In addition, Table 9 shows the results of evaluating the occurrence of reticulation (hereinafter abbreviated as Reti) for ITO sputtering with respect to the ink of the present invention. In addition, the flatness of the pixel portion was evaluated by the method described in Experimental Example 4.

(Evaluation Criteria for ITO Aptitude)

5... Reti is not occurring at all.

4… Almost no reti.

3... A slight occurrence of Reti is seen.

2… In part, the development of Reti is shown.

One… Large retication occurs and fogging occurs in the pixel area.

From the result of Table 8, the color filter of this invention whose residual viscosity of ink is 40 mPa * s or more and 4000 mPa * s or less at 25 degreeC was favorable flatness. In addition, it turned out from Table 9 that when it does not contain the monomer which has three or more polymerizable groups, reticulation occurs at the time of ITO sputtering.

Experimental Example 8

In the manufacture of Color Filter 1 and Liquid Crystal Display 1 of Experimental Example 6, except that the combinations shown in Table 10 were used as RGB inks, the same procedures as in Experiment 6 were conducted and the color filters 2 to 7 and the corresponding liquid crystal displays 2 to 7 were used. Prepared.

Experimental Example 9

<Formation of bulkhead>

(Production of deep photosensitive transfer material K2)

On the 75-micrometer-thick polyethylene terephthalate film support body, the coating liquid for thermoplastic resin layers which consists of following formula H1 was apply | coated and dried using the slit-shaped nozzle. Next, the coating liquid for intermediate | middle layers which consists of following prescription P1 was apply | coated and dried. Further, the deep 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 deep color composition layer having a dry film thickness of 2 μm were formed on the support member, and finally, a protective film (12 μm thick poly) was formed. Propylene film).

In this way, the deep color photosensitive transfer material which integrated the support body, the thermoplastic resin layer, the intermediate | middle layer (oxygen barrier film), and the deep color composition layer was produced, and the sample name was made into the deep color photosensitive transfer material K2.

<Coating solution for thermoplastic resin layer: Prescription 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

13.6 parts of styrene / acrylic acid copolymer (copolymerization composition ratio (molar ratio) = 63/37, average molecular weight = 10,000, Tg ≒ 100 ° C.)

9.1 parts of 2,2-bis [4- (methacryloxypolyethoxy) phenyl] propane (manufactured by Shin-nakamura Chemical Co., Ltd.)

Surfactant 1 0.54 parts

<Coating solution for intermediate layer: Prescription P1>

32.2 parts of PVA205 (polyvinyl alcohol, Kuraray Co., Ltd. product, saponification degree = 88%, polymerization degree 550)

14.9 parts of polyvinylpyrrolidone (IS-30, product K-30)

524 parts of distilled water

Methanol 429 parts

The glass-free liquid solution which adjusted the alkali free glass substrate to 25 degreeC was blown for 20 second by the shower, and it wash | cleaned with a rotary brush with a nylon hair, and after pure shower washing, a silane coupling liquid (N-((amino ethyl) (gamma) -aminopropyl) A 0.3 mass% aqueous solution of trimethoxysilane (trade name: KBM603, manufactured by Shin-Etsu Chemical Co., Ltd.) was blown with a shower for 20 seconds to perform pure shower cleaning. This board | substrate was heated at 100 degreeC for 2 minutes with the board | substrate preheater.

The cover film was removed from the deep color photosensitive transfer material K2 produced by the manufacturing method on the obtained silane coupling treated glass substrate, and the laminated film was laminated so that the exposed surface of the deep color composition layer and the surface of the silane coupling treated glass substrate were in contact with each other. (Hitachi Industries Co., Ltd. product (Lamic II type)) was laminated on the substrate heated at 100 ° C. for 2 minutes at a rubber roller temperature of 130 ° C., a linear pressure of 100 N / cm, and a conveyance speed of 2.2 m / min. Subsequently, the branched support of polyethylene terephthalate was peeled off at the interface with the thermoplastic resin layer to remove the branched support. After peeling off the supporting member, the substrate is exposed to a vertical position with a substrate (a quartz exposure mask having an image pattern) and a mask using a proxy meter type exposure machine (manufactured by Hitachi High-Tech.Electronics Engineering Co., Ltd.) having an ultra-high pressure mercury lamp. The distance between a mask surface and the said deep color composition layer was set to 200 micrometers, and the pattern exposure was carried out by exposure amount 70mJ / cm <2>.

Next, triethanolamine-based developer (containing 30% by mass of triethanolamine, trade name: T-PD2, Fuji Photo Film Co., Ltd.) was mixed 12 times with pure water (1 part by mass of T-PD2 and 11 parts by mass of pure water). ) The diluted solution) was shower-developed at 30 ° C. for 50 seconds at a flat nozzle pressure of 0.04 MPa to remove the thermoplastic resin layer and the intermediate layer. Subsequently, air was blown onto the upper surface of the substrate to remove the liquid, and then pure water was blown for 10 seconds with a shower, followed by pure shower cleaning, and air was blown to reduce the liquid level on the substrate.

Subsequently, Na-carbonate developer (0.38 mol / L of sodium bicarbonate, 0.47 mol / L of sodium carbonate, 5% by mass of sodium dibutylnaphthalenesulfonate, anionic surfactant, antifoaming agent, stabilizer containing, trade name: T-CD1, Fuji Photo Film Co., Ltd. (5 times diluted with pure water) using a cone nozzle pressure of 0.15 MPa for 30 seconds at 29 ℃ to develop a deep color composition layer to obtain a patterned image.

Subsequently, the cleaning agent (containing phosphate, silicate, nonionic surfactant, antifoaming agent, stabilizer, product name: T-SD1 Fuji Photo Film Co., Ltd.) was diluted 10 times with pure water, and then used at a cone type nozzle pressure at 33 ° C. for 20 seconds. Blowing was performed at 0.02 MPa in the shower, and the image formed by the rotary brush with nylon hair was rubbed to remove residues to obtain a partition.

Thereafter, the substrate was post-exposured at a side where the deep color composition layer of the substrate was formed at an exposure dose of 3000 mJ / cm 2 by an exposure apparatus used in the exposure step except that no mask was used for the substrate, and then heat-treated at 220 ° C. for 15 minutes.

Subsequently, ink repellent treatment was performed by the following method.

Ink repellent treatment by coating method

Alkali-soluble photosensitive resin (Hoechst Japan Ltd. product, positive type photoresist) in which a fluorine-based surfactant (Sumitomo 3M product, Florad FC-430) is 0.5% (relative to the solid content of the photosensitive resin) in advance on the formed substrate of the partition. AZP4210) was apply | coated using a slit-shaped nozzle so that it might become a film thickness of 2 micrometers, and heat processing was performed for 30 minutes at 90 degreeC in a warm air circulation dryer.

Subsequently, at an exposure dose of 110 mJ / cm 2 (38 mW / cm 2 × 2.9 seconds), the substrate was exposed through a partition wall from the side opposite to the partition wall side of the substrate on which the partition was formed, and an inorganic alkaline developer (manufactured by Hoechst Japan Ltd., AZ400K Developer, 1). After immersion rocking for 4 seconds in: 4), the surface energy difference was formed in and around the pixel by forming a water-repellent resin layer on the partition wall by rinsing for 30 to 60 seconds in pure water. Surface energy inside and outside the pixel after water-repellent resin layer formation was 10-15 dyne / cm outside the pixel (on the resin layer), and 55 dyne / cm inside the pixel (on the glass substrate).

Subsequently, after coloring the pixel part using ink R-1, G-1, and B-1 similarly to Experimental Example 6, the partition and all the pixels are hardened | cured completely by baking the color filter for 30 minutes in 230 degreeC oven. Color filter 9 was prepared. When the flatness of the pixel portion of the RGB was evaluated in the same manner as in Experiment 6, good flatness was obtained in both RGB as in the color filter 1. Using the color filter 9, the liquid crystal display device 9 was manufactured in the same manner as in Example 6.

Experimental Example 10

In the formation of the partition wall of Experimental Example 9, a partition wall was produced in the same manner as in Experimental Example 9, except that the color light-sensitive transfer material K2 was changed to the following color light-sensitive transfer material K3. In the same manner as in Experimental Example 6, the partitions were colored using ink R-1, G-1, and B-1, and then the color filters were baked in a 230 ° C. oven for 30 minutes to completely cure the partitions and each pixel. To produce a color filter 10. When the flatness of the pixel portion of the RGB was evaluated in the same manner as in Experiment 6, good flatness was obtained in both RGB as in the color filter 1. Using the color filter 10, the liquid crystal display device 10 was manufactured in the same manner as in Example 6.

[Production of Deep Photosensitive Transfer Material K3]

The deep color composition K1 was applied and dried using a slit nozzle on a support having a polyethylene terephthalate film (Teij in DuPont Films Japan Limited, Tetoron G2) having a thickness of 16 μm. In this way, the thick film composition layer whose dry film thickness is 2.0 micrometers was formed on the support body, and the protective film (polypropylene film of thickness 12 micrometers) was finally crimped | bonded.

In this way, the deep photosensitive transfer material in which the branch support and the deep color composition layer were integrally manufactured, and the sample name was made into the deep photosensitive transfer material K3.

<Evaluation>

(Evaluation of imbalance of color concentration in pixel part)

R, G, and B monochromatic images were developed for the liquid crystal display devices 1 to 10, and 10 people were judged whether or not color spots exist in the range of 10 cm x 10 cm.

[Evaluation standard]

A: 0 people who recognized the spot

B: The number of people who recognized that there is a stain 1-2 people

C: 3 or more people who recognized the stain

(Evaluation of indication dirt)

The display unevenness in the case where the liquid crystal display devices 1-10 were displayed white and the case where black was displayed was evaluated according to the following evaluation criteria.

[Evaluation standard]

A: Spots are not recognized in both the white and black marks.

B: No spots were seen in the black marks, but spots were recognized in the white marks.

C: Spots are recognized in both the white and black marks.

The evaluation results are shown in Table 11.

Experimental Example 11

In Table 5 of Experimental Example 6, V-40 is 2,4-bis (trichloromethyl) -6- [4 '-(N, N-bisethoxycarbonylmethyl) amino-3'-bromophenyl ] S inkjet ink (ink R-9), G inkjet ink (ink G-9), and B inkjet ink (ink B-12) in the same manner as in Experimental Example 6 except for changing to -s-triazine. Prepared. Using the above-mentioned RGB ink, ink was discharged until the desired density was obtained by using an inkjet recording apparatus in the region (concave region surrounded by convex portions) separated by the partition wall of the color filter substrate in the same manner as in Experimental Example 6. The color filter 11 which consists of R, G, and B pattern was manufactured.

Subsequently, after exposing a pixel part from the back surface of a board | substrate at 110mJ / cm <2> (38mW / cm <2> x2.9 second) exposure amount, and hardening a pixel part, the color filter after image coloring is baked for 30 minutes in 230 degreeC oven, and a partition and all the pixels are completely completed. Hardened. 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 similarly to the color filter 1.

R pixel portion: A height difference (B-A) of the pixel portion: 0.06 탆

G pixel portion: Height difference (B-A) of A pixel portion: 0.05 μm

B pixel portion: Height difference (B-A) of A pixel portion: 0.07 탆

Experimental Example 12

By using the ink B-3, B-4 of Experimental Example 5, and putting any one of the following processes A-C before baking for 30 minutes in 230 degreeC oven, it carried out similarly to Experimental Example 4, and forms a blue pixel part, The flatness of the pixel portion was evaluated.

Process A: The heat treatment is performed in a 70 degreeC oven for 2 minutes.

Process B: Immediately after dropping the ink, heat treatment is performed at 150 ° C. for 2 minutes.

Process C: The ink was removed, dried for 10 minutes under 5 mm Hg (0.67 kPa), and then heated in a 150 ° C. oven for 2 minutes.

Table 12 shows the evaluation results of the flatness.

The results of Table 12 show that the flatness of the pixel portion is improved by preheating at a temperature lower than the thermal polymerization start temperature of the ink. In addition, it can be seen that the flatness deteriorates on the contrary, when preheating above the polymerization temperature before drying is completed.

Experimental Example 13

In Ink B-1, the solvent composition was changed so that the ratio of 1,3-BGDA (high boiling point organic solvent) in the organic solvent was 20%, 45%, and 55%, thereby preparing Inks B-13 to 15. Moreover, the ink B-16-18 was prepared by adjusting the quantity of the organic solvent, without changing a solvent composition so that solid content in an ink might be 100%, 65%, and 45%. Moreover, the ink B-19, 20 was prepared by adjusting the quantity and solvent composition of a pigment dispersion liquid so that the ratio of the pigment to solid content may be 5% and 15%. In addition, as a solvent-free ink, Mimaki Engineering Co., Ltd. The UV ink cartridge cyan (viscosity 15 mPa * s at 25 degreeC) of the product was prepared. A blue pixel portion was formed in the same manner as Experimental Example 4 using the inks B-1, 13-20, and the solvent-free ink, and a transparent electrode of ITO was formed by the method described in Experimental Example 5, a) ejection stability, b) The flatness of the pixel portion was evaluated.

(Evaluation of Discharge Stability)

After the ink is filled into the inkjet head and discharged from the head, and after confirming that the ink is being discharged from all nozzles 128 nozzles of the head, the discharge is stopped for 5 minutes. Thereafter, ink is ejected from all the nozzles for one minute. After repeating the said stop-discharge process 4 times, the number of nozzles with which ink is not discharged was counted and it evaluated by the following evaluation criteria.

(Evaluation standard)

A ： 0 nozzles where ink is not discharged

B ： 1 to 2 nozzles from which ink is not discharged

C: The number of the nozzles which ink is not discharged 3-20

D ： Ink is hardly discharged

Table 13 shows the physical properties of the inks used for the evaluation and the evaluation results.

In Table 13, inks B-18, 19, and solvent-free inks, the ejected amount of the ink was adjusted so as to fill the recesses in which solid components in the ink were surrounded by partition walls. Evaluation in () indicates that flatness is deteriorated because the ink is overflowed from the concave portion to form a convex shape as a result of evaluation when the ink is discharged by adjusting the optical density of the pixel portion.

By using the inkjet ink of the present invention, there is no need to form an ink receiving layer or a protective layer, and the color filter is excellent in productivity and excellent in display quality without unevenness in the flatness of the pixel portion and the nonuniformity of color density in the pixel portion, It is possible to obtain a display device using a color filter.

From the results in Table 13, the pixel portion was adjusted by adjusting the ink so that the proportion of the high boiling point solvent was 50% or more, the solid content in the ink was 60% or less, and the proportion of the pigment in the solid content was 20% or more. It can be seen that an ink jet ink for color filters having not only good flatness but also excellent discharge stability of ink can be obtained.

Claims (18)

As ink jet ink for color filters containing at least a monomer having a colorant, an organic solvent and at least two polymerizable groups: The viscosity of the ink residue obtained by drying the said color filter inkjet ink for 8 hours at the conditions of 5 mmHg (0.67 kPa) and 45 degreeC in the mean thickness 1mm is 40 mPa * s or more and 4000 mPa * s or less at 25 degreeC, It is characterized by the above-mentioned. Inkjet ink for color filter to say. The inkjet ink for color filters according to claim 1, wherein the viscosity of the ink remainder is 50 mPa · s or more and 2000 mPa · s or less at 25 ° C. The inkjet ink for color filters according to claim 1, wherein the monomer has three or more polymerizable groups. The inkjet ink for color filters according to claim 1, wherein the colorant is a pigment. The inkjet ink for color filters according to claim 1, wherein the proportion of the colorant in the remainder of the ink is 20% by mass or more. The inkjet ink for color filters according to claim 1, wherein the proportion of the organic solvent is 40% by mass or more. The inkjet ink for color filters according to claim 1, wherein the monomer has a viscosity of 700 mPa · s or less at 25 ° C and three or more polymerizable groups. The inkjet ink for color filters according to claim 1, wherein the monomer has a viscosity of 200 mPa · s or less at 25 ° C and three or more polymerizable groups. The inkjet ink of claim 1, wherein the polymerizable group is any one selected from the group consisting of an epoxy group, an acryloyloxy group, and a methacryloyloxy group. The inkjet ink of claim 1, wherein at least 50% by mass 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 color filters according to claim 1, further comprising a polymerization initiator. 12. The method of claim 11, wherein the polymerization initiator is 2,4-bis (trichloromethyl) -6- [4 '-(N, N-bisethoxycarbonylmethyl) amino-3'-bromophenyl] -s Inkjet ink for color filters, characterized in that it is a triazine. The inkjet ink for color filters according to claim 1, further comprising a surfactant. A method of manufacturing a color filter, wherein a color layer is formed by imparting droplets of the ink jet ink for color filters according to claim 1 by an ink jet method in a recess surrounded by a partition formed on a substrate. 15. The residue of claim 14, wherein the residue is polymerized by removing the organic solvent contained in the droplet to form an ink residue, and then irradiating active energy rays to the ink residue and / or heating the ink residue. And forming a colored layer, The manufacturing method of the color filter characterized by the above-mentioned. 16. The method according to claim 15, wherein when the temperature at which the thermal polymerization of the ink remainder is started is set to T 占 폚, preheating is performed at a temperature below T 占 폚 to remove the organic solvent contained in the droplet to form the ink residue. A method of manufacturing a color filter, wherein the remaining ink is polymerized by a step of irradiating an active energy ray to an ink remaining portion and / or heating the ink remaining portion at a temperature of T ° C or higher. The color filter manufactured by the manufacturing method of the color filter of Claim 14. A display device comprising the color filter according to claim 17.