JP4902275B2 - Color filter, method for manufacturing the same, and display device - Google Patents

Description

  The present invention relates to a method of manufacturing a color filter, a color filter manufactured by the method, and a display device using 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 the color liquid crystal display is expensive, there is an increasing demand for cost reduction, and in particular, there is a high demand for cost reduction for a color filter having high specific gravity.

  In such a color filter, it is usually provided with coloring patterns of three primary colors of red (R), green (G), and blue (B), and electrodes corresponding to the respective pixels of R, G, and B are turned on, By turning it off, the liquid crystal operates as a shutter, and light passes through each of the R, G, and B pixels, and color display is performed.

  As a conventional manufacturing method, 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 region by spraying colored ink (inkjet ink) by an inkjet method has been proposed.
As an ink-jet ink for forming a color filter, an ink using an epoxy compound or an acrylate monomer for curing the formed film is known. For example, a photocurable ink-jet ink using an acrylate monomer has been proposed (see, for example, Patent Document 1). However, since the photocuring process is required, there are problems that the tact time is increased, the equipment investment and the space of the exposure apparatus are required.
Moreover, although there exists an Example which forms an colored layer only by high temperature drying using an acrylate monomer (for example, refer patent document 2), this method had the problem that surface hardness was insufficient and it was easy to be damaged. .
Moreover, about what uses an epoxy compound, the crack is prevented by drying at high temperature after low-temperature drying at 100-160 degreeC (for example, refer patent document 3). However, there is no disclosure about surface hardness.
JP 2002-201387 A JP 2000-310706 A JP 2003-66223 A

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a color filter having high hardness in a cured colored region, a method for manufacturing the color filter, and a display device including the color filter.

That is, the present invention
<1> organic solvent, a colored region formed by firing droplets on the substrate 10 mass% or less of the ink jet method in the total solids content of at least unrealized binder a colorant and an epoxy compound ink The color filter is produced by drying at a temperature of 45 ° C. or more and 60 ° C. or less and after being dried at a high temperature higher than the drying temperature of the low temperature drying.

  <2> The method for producing a color filter according to <1>, wherein the low-temperature drying is performed in a reduced pressure state.

  <3> At least one of the colorants is C.I. I. Pigment. green. 36. The method for producing a color filter according to <1> or <2>, wherein the method is 36.

  <4> At least one of the colorants is C.I. I. Pigment. Red. The method for producing a color filter according to <1> or <2>, wherein the method is 254.

  <5> At least one of the colorants is C.I. I. Pigment. blue. The method for producing a color filter according to <1> or <2>, wherein the ratio is 15: 6.

  ADVANTAGE OF THE INVENTION According to this invention, the color filter with the high hardness of the hardening coloring area | region, its manufacturing method, and the display apparatus provided with the color filter can be provided.

Hereinafter, the color filter of the present invention, the manufacturing method thereof, and the display device including the color filter will be described in detail.
<Color filter and manufacturing method thereof>
The method for producing a color filter according to the present invention comprises a method of forming a colored region formed by ejecting ink containing at least an organic solvent, a colorant and an epoxy compound on a substrate by an ink jet method, after drying at a low temperature of 40 ° C. or more and less than 80 ° C. It is characterized by being cured by drying at a high temperature higher than the drying temperature of the low-temperature drying.
It is possible to improve the hardness of the colored region by drying the colored region formed by the inkjet ink at a temperature higher than the drying temperature of the low temperature drying after the low temperature drying at 40 ° C. or more and less than 80 ° C.

The drying temperature in the high temperature drying is not particularly specified as long as it is higher than the drying temperature in the low temperature drying (40 ° C. or more and less than 80 ° C.), but preferably 200 ° C. to 300 ° C., more preferably 220 ° C. to 300 ° C. is there.
Further, the drying temperature in the low temperature drying may be gradually raised to the drying temperature of the high temperature drying and then dried at a high temperature.

The drying time is not particularly limited, but is preferably a short time in consideration of productivity, and more preferably within 1 hour for both low temperature drying and high temperature drying.
Furthermore, from the viewpoint of shortening the drying time, it is preferable to perform low temperature drying in a reduced pressure state. The reduced pressure state refers to a state of 50000 Pa or less, preferably 10,000 Pa or less.

-Inkjet ink-
The ink-jet ink used in the present invention contains at least an organic solvent, a colorant and an epoxy compound, and requires a dispersant, a binder, a photopolymerization initiator, a thermal polymerization initiator, a surfactant, or other additives. It may be included depending on.

(Flowability of ink remaining)
The ink-jet ink used in the present invention has a viscosity of 40 mPa · s or more and 4000 mPa at 40 ° C. at 25 ° C. at 25 ° C. after drying for 8 hours under conditions of 5 mmHg (0.67 kPa) and 45 ° C. with an average thickness of 1 mm. -It is preferable that it is below s.

  The viscosity of the remaining ink at 25 ° C. 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 colored region (pixel) has fluidity even after the solvent is dried, so that a flat pixel can be obtained.

  The “ink residue” in the present invention refers to a residue obtained by drying an inkjet ink for 8 hours under the conditions of 5 mmHg (0.67 kPa) and 45 ° C. with an average thickness of 1 mm. When measuring the viscosity of the remaining ink using a viscoelasticity measuring device, for example, the inkjet ink is placed in an aluminum tray so that the average thickness is 1 mm, and vacuum dried (0.67 kPa) at 45 ° C. for 8 hours. The obtained residue (residual ink residue) can be collected from an aluminum dish using a chemical scoop 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, inkjet ink is applied to a glass plate by a spinner and vacuum-dried (0.67 kPa) at 45 ° C. for 8 hours to obtain 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 used in the present invention will be described in detail.
(Coloring agent)
As the colorant used in the inkjet ink used in the present invention, known ones 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. 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.

  When the inkjet ink is red, at least one of the pigments used is C.I. I. Pigment. Red. 254 is preferred. When the inkjet ink is green, at least one of the pigments is C.I. I. Pigment. green. 36 is preferred. When the inkjet ink is blue, at least one of the pigments is C.I. I. Pigment. blue. It is preferably 15: 6.

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; 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. A combination with CI Pigment Yellow 180, and C.I. 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 less than 0.001 μm, the particle surface energy is increased and the particles are easily aggregated, so that it is difficult to disperse the pigment and it is difficult to keep the dispersion state stable. On the other hand, if the number average particle diameter of the pigment exceeds 0.1 μm, the polarization is canceled by the pigment, and the contrast is lowered. 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 by adding and dispersing the composition obtained by mixing the pigment and the pigment dispersant in advance to an epoxy compound described later. 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 used in 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.

(Epoxy compound)
Examples of the epoxy compound used in the inkjet ink of the present invention include aromatic epoxides and alicyclic epoxides. Aromatic epoxides include di- or polyglycidyl ethers produced by the reaction of polyphenols having at least one aromatic nucleus or their alkylene oxide adducts and epichlorohydrin, such as bisphenol A or its alkylene oxides. Examples thereof include di- or polyglycidyl ethers of adducts, di- or polyglycidyl ethers of hydrogenated bisphenol A or alkylene oxide adducts thereof, and novolak type epoxy resins. Here, examples of the alkylene oxide include ethylene oxide and propylene oxide.

Examples of the alicyclic epoxide include cyclohexene oxide obtained by epoxidizing a compound having at least one cycloalkane ring such as cyclohexene or cyclopentene ring with an appropriate oxidizing agent such as hydrogen peroxide or peracid. Preferred examples include cyclopentene oxide-containing compounds.
Examples of the aliphatic epoxide include dihydric polyhydridyl ethers of aliphatic polyhydric alcohols or alkylene oxide adducts thereof, and typical examples thereof include diglycidyl ether of ethylene glycol, diglycidyl ether of propylene glycol or 1,6. -Diglycidyl ether of alkylene glycol such as diglycidyl ether of hexanediol, polyglycidyl ether of polyhydric alcohol such as di- or triglycidyl ether of glycerin or its alkylene oxide adduct, diglycidyl of polyethylene glycol or its adduct of alkylene oxide Polyalkylene glycol diglycol represented by diglycidyl ether of ether, polypropylene glycol or its alkylene oxide adduct Jill ether, and the like. Here, examples of the alkylene oxide include ethylene oxide and propylene oxide.
Among these epoxy compounds, aromatic epoxides and alicyclic epoxides are preferable from the viewpoint of excellent curing speed, and alicyclic epoxides are particularly preferable.
In addition, an epoxy compound having a small number of functional groups is preferable because it can have both solubility and viscosity adjusting functions at the same time.

  Examples of monofunctional epoxides used in the present invention include, for example, phenyl glycidyl ether, p-tert-butylphenyl glycidyl ether, butyl glycidyl ether, 2-ethylhexyl glycidyl ether, allyl glycidyl ether, 1,2-butylene oxide, 1 , 3-butadiene monooxide, 1,2-epoxydodecane, epichlorohydrin, 1,2-epoxydecane, styrene oxide, cyclohexene oxide, 3-methacryloyloxymethylcyclohexene oxide, 3-acryloyloxymethylcyclohexene oxide, 3- Examples include vinylcyclohexene oxide.

  Examples of polyfunctional epoxides include, for example, bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, bisphenol S diglycidyl ether, brominated bisphenol A diglycidyl ether, brominated bisphenol F diglycidyl ether, brominated bisphenol S diglycidyl. Ether, epoxy novolac resin, hydrogenated bisphenol A diglycidyl ether, hydrogenated bisphenol F diglycidyl ether, hydrogenated bisphenol S diglycidyl ether, 3,4-epoxycyclohexylmethyl-3 ′, 4′-epoxycyclohexanecarboxylate, 2 -(3,4-epoxycyclohexyl-5,5-spiro-3,4-epoxy) cyclohexane-meta-dioxane, bis (3,4-epoxycyclohexyl) Til) adipate, vinylcyclohexene oxide, 4-vinylepoxycyclohexane, bis (3,4-epoxy-6-methylcyclohexylmethyl) adipate, 3,4-epoxy-6-methylcyclohexyl-3 ′, 4′-epoxy-6 '-Methylcyclohexanecarboxylate, methylenebis (3,4-epoxycyclohexane), dicyclopentadiene diepoxide, ethylene glycol di (3,4-epoxycyclohexylmethyl) ether, ethylenebis (3,4-epoxycyclohexanecarboxylate) , Epoxyhexahydrophthalate dioctyl, epoxyhexahydrophthalate di-2-ethylhexyl, 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, Resin triglycidyl ether, trimethylolpropane triglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ethers, 1,1,3-tetradecadiene dioxide, limonene dioxide, 1,2,7,8-di Examples thereof include epoxy octane, 1,2,5,6-diepoxycyclooctane and the like.

The amount of the epoxy compound used is preferably 20% by mass or more, more preferably 30% by mass or more, and further preferably 40% by mass or more based on the solid content of the ink. If the amount of the epoxy compound used is less than 20% by mass, the polymerization of the pixel portion becomes insufficient, so that the film strength of the pixel portion becomes insufficient and is easily scratched, or when applying a transparent conductive film. The problem arises that there is insufficient solvent resistance when forming the alignment film.
In the present invention, the “ink solid content” refers to a portion excluding the solvent in all inks.

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, as an epoxy compound to be used, use of a lower viscosity epoxy compound is mentioned. 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 effective to use an epoxy compound having a low viscosity. In order to provide the film strength of the pixel, it is preferable to use an epoxy compound having three or more epoxy 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 epoxy compound to be used needs to be water-soluble. Since these water-soluble binders and epoxy compounds have polar groups, the viscosity of the remaining ink after removal of the water-soluble organic solvent tends to be high, and it is difficult to flatten the shape of the color filter pixels.
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. When the proportion of the organic solvent is less than 40% by mass, the amount of ink ejected in one pixel is small, so that wetting and spreading of the ink in the pixel is insufficient and the flatness is deteriorated. There is a case.

  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]. Propylene 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-butane Diol diacetate, dipropylene glycol-n-propyl ether acetate, propylene carbonate, diethylene glycol monobuty Ruether 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 used in the present invention, a polymerization initiator may be used in combination for the purpose of promoting the polymerization reaction of the epoxy compound. A thermal polymerization initiator is used as the polymerization initiator.

  Examples of the thermal polymerization initiator include dicyandiamine, organic acid hydrazide, and amine imide compounds.

As content of a thermal-polymerization initiator, 0.5-20 mass% is preferable with respect to the quantity of an epoxy compound, More preferably, it is 1-15 mass%. If the content of the polymerization initiator is less than 0.5% by mass with respect to the epoxy compound, the effect may be reduced, and if it exceeds 20% by mass, the viscosity of the inkjet ink may change over time, Coloring by decomposition products may be a problem.
These initiators can be used alone or in combination of two or more.

You may add a photoinitiator to the inkjet ink used for this invention as needed. Examples of the photopolymerization initiator include aromatic diazonium salts and diallyl iodonium salts.
When a colored region is formed using an inkjet ink containing a photopolymerization initiator, the hardness of the colored region can be further improved by irradiating the colored region with an active energy ray.

  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. From the viewpoint of improving flatness, the amount of the binder is preferably small, and a flat pixel can be formed when the amount is 0 to 10% by mass in the total solid content of the ink.

  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. The content of the surfactant is preferably from 0 to 10% by mass in the case of a fluorinated surfactant, and from 0.01 to 3.0% by mass with respect to the total amount of ink solids, and is from 0.01 to 3.0% by mass. From the viewpoint of In the case of a non-fluorinated surfactant, 0 to 15% by mass is preferable, and 2 to 10% by mass is particularly preferable from the viewpoint of the flatness of the ink and the wetting and spreading.

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

-Manufacture of color filters-
A colored region formed by ejecting the above-described ink-jet ink onto a substrate by an ink-jet method is dried at a high temperature at a temperature higher than 40 ° C. and lower than 80 ° C. and then dried at a high temperature higher than the drying temperature of the low-temperature drying to be cured. The color filter of the present invention is manufactured. In the present invention, a colored region may be formed by applying ink-jet ink droplets to a recess surrounded by a partition formed on a substrate by an ink-jet method.

This colored region is a color pixel of red (R), green (G), blue (B), etc. constituting the color filter.
The colored region 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, a method of thermally curing ink 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 fluctuations 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 areas by spraying RGB three-color inks.

  When the inkjet ink contains a photopolymerization initiator, a step (photocuring step) of irradiating the colored region with an active energy ray and curing it can be provided. In the photocuring step, a cured colored region can be formed by curing the ink-jet ink of each color including red (R), green (G), and blue (B). Curing may be performed every time a colored region of one color is formed, or may be performed after forming colored regions of a plurality of colors.

  Curing of inkjet inks such as R, G, and B can be performed by performing an exposure process that promotes polymerization and curing using an energy source that emits active energy rays in a wavelength region corresponding to the photosensitive wavelength of the ink.

  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 epoxy compound and the polymerization initiator, and can be, for example, 1 to 30 seconds.

(Partition wall)
The partition described above may be any type, but in the case of producing a color filter, a partition having a black matrix function and a light shielding 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 viewpoints of cost reduction, surface smoothness, ink repellency, and edge sharpness. 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. On the other hand, the so-called color resist coating method is preferably used from the viewpoint of the hardness of the black matrix and the surface unevenness.

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 regions (pixels) and the partition walls as described above to produce the color filter, an overcoat layer can be formed so as to cover the entire surfaces of the color regions and the partition walls 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 method for producing a color filter 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. Say. 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.)”. Further, 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 Research Division)".

  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 (Optic Liquid Bistic). Various display modes such as (Vertical Aligned), HAN (Hybrid Aligned Nematic), and GH (Guest Host) can be adopted. It is characterized by using the color filter as described above, and it has no display unevenness when mounted on a TV or monitor, and can have a wide color reproduction range and a high contrast ratio. It can be suitably used for a large-screen display device or the like.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited to these. Unless otherwise specified, in the following examples, “part” represents “part by mass”, “%” represents “mass%”, and “molecular weight” represents “weight average molecular weight”.

[Example 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-bisdiethoxycarbonylmethyl) amino-3 in the amounts shown in Table 1 '-Bromophenyl] -s-triazine and Surfactant 1 are weighed and added in this order at a temperature of 25 ° C. (± 2 ° C.) and stirred at a temperature of 40 ° C. (± 2 ° C.) at 150 rpm for 30 minutes. can get. 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.,
Product 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 prepared as described above with a glass substrate coater (manufactured by FS Asia Co., Ltd., trade name: MH-1600) having a slit-like nozzle. Composition 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. A composition 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 ultra-high pressure cleaning nozzle to remove the residue, and post exposure was performed from the top surface at an exposure amount of 2500 mJ / cm ^{2 in} the atmosphere to obtain an optical density of 3. 9. Striped partition walls (black matrix) having openings with a thickness of 2.0 μm and a width of 100 μm were obtained.

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

-Preparation of pigment dispersion-
<Pigment dispersion for G (G1)>
Brominated phthalocyanine green (CI Pigment Green 36, trade name: Rionol Green 6YK, manufactured by Toyo Ink Manufacturing Co., Ltd.), pigment dispersant 1 (compound 1 above) and solvent (1,3-butanediol diacetate; boiling point 232 ° C.) (hereinafter abbreviated as 1,3-BGDA) as shown in Table 2 below, and after premixing, a motor mill M-50 (manufactured by Eiger Japan) and zirconia having a diameter of 0.65 mm Using beads, the mixture was dispersed for 9 hours at a peripheral speed of 9 m / s to prepare a pigment dispersion for G (G1).

<Other pigment dispersions>
In the G pigment dispersion (G1), the G pigment dispersion (G2) and the R pigment were the same as the G pigment dispersion (G1) except that the pigment and other components were blended as shown in Table 2. Dispersions (R1) and (R2) and pigment dispersions for B (B1) and (B2) were prepared.

Details of the materials used are shown.
・ C. I. P. R. 254 (Brand name: Irgaphor Red B-CF, manufactured by Ciba Specialty Chemicals Co., Ltd.)
・ C. I. P. R. 177 (trade name: Chromophthal Red A2B, manufactured by Ciba Specialty Chemicals Co., Ltd.)
・ C. I. P. Y. 150 (Product name: Bayplast Yellow 5GN 01, manufactured by Bayer Corporation)
・ C. I. P. B. 15: 6 (trade name: Rionol Blue ES, manufactured by Toyo Ink Manufacturing Co., Ltd.)
・ C. I. P. V. 23 (Product name: Hostaperm Violet RL-NF, manufactured by Clariant Japan Co., Ltd.)

-Preparation of colored ink for pixels-
<Inkjet ink for G>
As shown in the following Table 3, propylene glycol monomethyl ether acetate (PGMEA; boiling point 146 ° C.), epoxy compound (monomer) Denacol EX-314 (glycerol polyglycidyl ether, manufactured by Nagase ChemteX Corporation), surfactant 1. Thermal polymerization initiator (V-40 (azobis (cyclohexane-1-carbonitrile)) manufactured by Wako Pure Chemical Industries, Ltd.) After mixing and stirring at 25 ° C. for 30 minutes, there is no insoluble matter. After confirmation, a monomer solution was prepared.
Next, while stirring the pigment dispersion liquid for G (G1) and the pigment dispersion liquid for G (G2), the monomer liquid is slowly added and stirred at 25 ° C. for 30 minutes. 1) was prepared.
Similarly, an inkjet ink for R (ink R-1) and an inkjet ink for B (ink B-1) were prepared.

<Measurement of ink properties>
The viscosity of the ink was measured using an E-type viscometer (RE-80L) manufactured by Toki Sangyo Co., Ltd. under the following conditions.
(Measurement condition)
-Rotor used: 1 ° 34 'x R24
・ Measurement time: 2 minutes ・ Measurement temperature: 25 ° C

<Measurement of remaining ink viscosity>
First, the ink 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. did. This sample was obtained from Jasco International Co. Measurement was performed at a measurement temperature of 25 ° C. and a frequency of 1 Hz using a viscoelasticity measuring device DynAlyser DAS-100 manufactured by Ltd.

-Formation of pixel part by inkjet method-
Next, using the inks R-1, G-1, and B-1 described above, Dimatix Co., Ltd. is placed in the region (the concave portion surrounded by the convex portion) divided by the partition wall of the color filter substrate obtained above. The ink jet head (SE-128, head temperature 28 ° C.) ejected ink until the desired density was achieved, prebaked at 60 ° C. for 2 minutes, and then baked in an oven at 230 ° C. for 30 minutes to form the partition walls and pixels. Both were completely cured to produce a color filter composed of R, G, and B patterns.

The pencil hardness of the pixel of the color filter produced as described above was carried out as follows.
The ink is spin-coated on an alkali-free glass substrate separately (the rotation speed is adjusted so that the OD of the dry film becomes a target). After the above drying process, the pencil hardness is measured by the method described in JIS-K5400. The test was conducted.

  A transparent electrode made of ITO (Indium Tin Oxide) was further formed by sputtering on the R pixel, G pixel, B pixel and black matrix of the color filter obtained above.

Next, according to Example 1 of Japanese Patent Application Laid-Open No. 2006-64921, a spacer was formed in a portion corresponding to the upper part of the black matrix on the ITO film formed as described above.
Separately, a glass substrate was prepared as a counter substrate, patterned on the transparent electrode of the color filter substrate and the counter substrate for the PVA mode, and an alignment film made of polyimide was further provided thereon.
After that, a UV curable resin sealant is applied by a dispenser method at a position corresponding to the outer periphery of the black matrix provided so as to surround the pixel group of the color filter, and a liquid crystal for PVA mode is dropped and attached to the counter substrate. After bonding, the bonded substrate was irradiated with UV, and then heat-treated to cure the sealant. Polarizing plates HLC2-2518 manufactured by Sanlitz Co., Ltd. were attached to both surfaces of the liquid crystal cell thus obtained. Next, FR1112H (chip type LED manufactured by Stanley Electric Co., Ltd.) as a red (R) LED, DG1112H (chip type LED manufactured by Stanley Electric Co., Ltd.) as a green (G) LED, and DB1112H (as a blue (B) LED. A side-light type backlight was constructed using a chip-type LED manufactured by Stanley Electric Co., Ltd. and placed on the back side of the liquid crystal cell provided with the polarizing plate to obtain a liquid crystal display device.

[Examples 2-3, Reference Example 4, Example 5, Comparative Examples 1-3]
In Example 1, a color filter and a liquid crystal display device were produced in the same manner as in Example 1 except that the drying conditions after discharging the ink were changed to the conditions shown in Table 4. In Example 5, vacuum drying was performed using a vacuum oven (VAC-100PR, manufactured by ESPEC).
For Example 2, the drying temperature (50 ° C.) in the low temperature drying was gradually increased at a rate of 5 ° C./min to the drying temperature (230 ° C.) of the high temperature drying, and then high temperature drying was performed at 230 ° C.

In the case of using a polyfunctional acrylic monomer, if the drying at a high temperature was performed after the drying at a low temperature, the pencil hardness of the film increased and the scratch resistance of the pixel was improved. Therefore, the number of defects at the time of forming the color filter is reduced, and the number of defects such as light leakage is small in the liquid crystal display device.

[Example 6]
<Formation of partition walls>
(Preparation of dark photosensitive transfer material K1)
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 2.3 μm on the temporary support. Finally, a protective film (12 μm thick 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 K1. 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 by a substrate preheating apparatus.
The cover film is removed from the dark photosensitive transfer material K1 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 a substrate heated at 100 ° C. for 2 minutes using a laminator (manufactured by Hitachi Industries, Ltd. (Lamic II type)) is heated to 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 on both sides of the substrate, post exposure is performed from the upper surface with an exposure amount of 3000 mJ / cm ² using the exposure machine used in the exposure step, and heat treatment is performed at 220 ° C. for 15 minutes to obtain an optical density of 3 .9, a stripe-shaped partition wall having an opening with a thickness of 2.0 μm and a width of 100 μm was obtained.

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 was exposed from the rear surface of the substrate on which the partition walls were formed with an exposure amount of 110 mJ / cm ² (38 mW / cm ² × 2.9 seconds), and an inorganic alkaline developer (Az400K Developer, manufactured by Hoechst Japan Co., Ltd., 1 : 4) After immersing and shaking in 80 seconds, rinse treatment was performed in pure water for 30 to 60 seconds to form a water-repellent resin layer on the partition wall, thereby providing a surface energy difference between the inside and outside of the pixel. 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, ink is ejected using the inks R-1, G-1, and B-1 in the same manner as in the first embodiment, and low temperature drying and high temperature drying are performed under the same conditions as in the first embodiment. Both were completely cured to produce a color filter. When the pencil hardness of the RGB pixel portion was evaluated in the same manner as in Example 1, it was possible to obtain good pencil hardness for both RGB as in the color filter of Example 1. Further, when a liquid crystal display device was produced in the same manner as in Example 1, the number of defects such as light leakage was small and the display quality was good.

Claims (5)

Organic solvent, a colored region formed by firing droplets on the substrate 10 mass% or less of the ink jet method in the total solids content of at least unrealized binder a colorant and an epoxy compound ink, 45 ° C. A method for producing a color filter, comprising: drying at a high temperature of 60 ° C. or less and then drying at a high temperature at a temperature higher than the drying temperature of the low temperature drying.   The method for producing a color filter according to claim 1, wherein the low-temperature drying is performed in a reduced pressure state.   At least one of the colorants is C.I. I. Pigment. green. The method for producing a color filter according to claim 1, wherein the color filter is 36.   At least one of the colorants is C.I. I. Pigment. Red. The method for producing a color filter according to claim 1, wherein the color filter is H.254.   At least one of the colorants is C.I. I. Pigment. blue. It is 15: 6, The manufacturing method of the color filter of Claim 1 or 2 characterized by the above-mentioned.