JP2010217927A - Method for producing color filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a color filter in which the surface of each pixel part is flat and the thickness of each pixel part is uniform even when the pixel parts are formed by an inkjet method. <P>SOLUTION: The method for producing the color filter includes, at the least, a pixel part forming process of sticking inks onto a transparent substrate by the inkjet method to form a plurality of colored pixel parts according to a predetermined pattern. Each pixel part formed in the pixel part forming process includes a convex shape. A pixel part leveling process of leveling the convex pixel part is carried out after the pixel part forming process. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a color filter suitable for a color liquid crystal display device, which can obtain a flat pixel portion even when the pixel portion is formed by an ink jet method or the like.

  In recent years, with the development of personal computers, especially portable personal computers, the demand for liquid crystal displays, particularly color liquid crystal displays, has been increasing. However, since this 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 a 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.

  In such a color filter manufacturing method, for example, a pixel portion is formed by ejecting and adhering ink to an lyophilic region on a substrate on which a pattern having different wettability is formed by an inkjet method, There is a method for obtaining a color filter (Japanese Patent Laid-Open No. 11-337726). Such a method has the advantage that the three primary color patterns of normal red (R), green (G), and blue (B) can be colored simultaneously, and the process can be simplified. Therefore, it is useful as a method for producing a color filter.

  However, in such a method, since the ink is attached to the lyophilic region using the difference in wettability, the central portion of the pixel portion is necessarily formed in a convex shape. If it is convex in this way, there is a problem that color unevenness may occur in the pixel portion. In addition, when the pixel portion is formed by an ink discharge method such as an ink jet method, there is a possibility that the discharge amount of each color is different, and the thickness may be different between the pixel portions. In such a case, uneven coloring occurs due to the pixel portion, which is not preferable, and also causes a problem that the cell gap becomes non-uniform.

JP 11-337726 A

  The present invention has been made in view of the above problems, and even when the pixel portion is formed by an ink discharge method, the surface of the color filter is flat and the thickness of each pixel portion is uniform. The main purpose is to provide a method.

  In order to achieve the above object, the present invention has at least a pixel portion forming step of forming a plurality of color pixel portions in a predetermined pattern by depositing ink on a transparent substrate by a discharge method according to claim 1. In the method of manufacturing a color filter in which the pixel portion formed in the pixel portion forming step has a convex shape, a pixel portion flattening step of flattening the convex pixel portion after the pixel portion forming step is performed. A method for producing a color filter is provided.

  As described above, since the present invention performs the pixel portion flattening step after the pixel portion forming step, the surface of the pixel portion is flat even in the color filter in which the pixel portion is formed by the discharge method. Color unevenness does not occur in the part. Further, since the thickness of each pixel portion can be made constant by the pixel portion flattening step, there is no uneven coloring due to the pixel portion, and the cell gap can be made uniform.

  In the invention described in claim 1, as described in claim 2, it may further include a step of forming a light shielding portion. This is because the color filter manufacturing method of the present invention can be applied to a color filter having a light shielding part or a color filter having no light shielding part.

  In the invention described in claim 1 or 2, it is preferable to perform the pixel portion flattening step after making the convex pixel portion semi-cured as described in claim 3. . This is because the pixel portion flattening process cannot be performed accurately when the pixel portion is uncured or cured.

  Furthermore, in the invention described in any one of claims 1 to 3, as described in claim 4, the pixel portion flattening step is performed from above. It can be set as the process of applying pressure and planarizing. In this case, as described in claim 5, the step of flattening the convex pixel portion by applying pressure from above may be a step using a cylindrical pressure roll or a step using a planar press. preferable.

  On the other hand, in the invention described in any one of claims 1 to 3, as described in claim 6, the flattening step of the pixel portion is performed above the convex pixel portion. It can also be set as the process planarized by removing. In this case, as described in claim 7, the step of flattening by removing the upper portion of the convex pixel portion scrapes the upper portion of the pixel portion using a doctor blade, or the eighth aspect of the invention. As described above, it is preferable that the step of flattening by removing the upper portion of the convex pixel portion is a step of cutting the upper portion of the pixel portion using a cutter.

  In the invention described in any one of claims 1 to 8, it is preferable that the discharge method is an ink jet method as described in claim 9. This is because if ink is attached by an ink jet method, ink can be attached with high positional accuracy, and the quality of the obtained color filter can be improved.

  In the invention described in any one of claims 1 to 9, as described in claim 10, the pixel portion forming step changes the wettability of the surface on the transparent substrate. It is preferable that the wettability variable layer is formed and ink is attached to the ink-philic region on the wettability variable layer, and the wettability as described in claim 11 is preferable. The variable layer is preferably a photocatalyst-containing layer composed of at least a photocatalyst and a binder, and is a layer whose wettability changes so that the contact angle with the liquid is reduced by energy irradiation.

  By forming such a layer, it is possible to easily change the wettability of this layer by performing pattern irradiation of energy, etc., and to form an ink-philic region with a small contact angle with the liquid, for example, Only the portion where the pixel portion is formed can be easily set as the ink-philic region. Therefore, a color filter can be manufactured efficiently, which is advantageous in terms of cost.

As described above, the photocatalyst-containing layer used in the present invention is composed of at least a photocatalyst and a binder. Among these, the photocatalyst is composed of titanium oxide (TiO ₂ ), zinc oxide (ZnO) as described in claim 12. ), Tin oxide (SnO ₂ ), strontium titanate (SrTiO ₃ ), tungsten oxide (WO ₃ ), bismuth oxide (Bi ₂ O ₃ ), and iron oxide (Fe ₂ O ₃ ) It is preferable that the substance is a species or more. Of these, titanium oxide (TiO ₂ ) is preferable as described in claim 13. This is because titanium oxide is effective as a photocatalyst because of its high band gap energy, is chemically stable, has no toxicity, and is readily available.

Further, in the color filter according to any one of claims 11 to 13, the binder which is another component constituting the photocatalyst-containing layer is Y _n SiX as described in claim 14. _(4-n) wherein Y represents an alkyl group, a fluoroalkyl group, a vinyl group, an amino group, a phenyl group or an epoxy group, X represents an alkoxyl group or a halogen. N is an integer from 0 to 3. It is preferably an organopolysiloxane which is one or two or more hydrolysis condensates or co-hydrolysis condensates of a silicon compound represented by:

  In any one of claims 11 to 14, as described in claim 15, the contact angle with the liquid having a surface tension of 40 mN / m on the photocatalyst containing layer is irradiated with energy. It is preferably 10 degrees or more in the unexposed portion and less than 10 degrees in the irradiated portion. Since the portion not irradiated with energy is a portion that requires ink repellency, if the contact angle with a liquid having a surface tension of 40 mN / m is less than 10 degrees, the ink repellency is not sufficient, This is not preferable because there is a possibility that ink may remain. Further, when the contact angle with the liquid with the surface tension of 40 mN / m in the portion irradiated with energy is 10 degrees or more, there is a possibility that the spread of ink in this portion may be inferior, and color loss in the pixel portion, etc. This is because there is a possibility of occurrence.

  According to the present invention, there is provided a color filter manufactured by the method according to any one of claims 1 to 15 as described in claim 16. In such a color filter, the surface of the pixel portion is flat, and color unevenness does not occur in the pixel portion. Further, since the thickness of each pixel portion can be made constant, there is no uneven coloring due to the pixel portion, and the cell gap can be made uniform.

  Furthermore, in the present invention, at least a transparent substrate and a pixel portion in which a plurality of colors are formed in a predetermined pattern by adhering ink onto the transparent substrate by a discharge method are provided. In addition, the present invention provides a color filter characterized in that the difference in thickness between the pixel portions is within a range of ± 0.5 μm. The color filter of the present invention has such an advantage that a liquid crystal display device can be provided in which the difference in thickness of each pixel portion is small and there is no uneven coloring due to the pixel portion and the cell gap is uniform.

  Such a color filter may have a light-shielding portion as described in claim 18 or may be formed by the ink jet method as described above. It is preferable.

  Furthermore, in the inventions described in the sixteenth to nineteenth aspects, as described in the twentieth aspect, it is preferable that the pixel portion is formed of a UV curable ink because of the simplicity of the process.

  In the present invention, as described in claim 21, the color filter according to any one of claims 16 to 20 and a substrate facing the color filter are provided, and a liquid crystal is provided between the substrates. Provided is a color liquid crystal display device comprising a compound encapsulated. Such a color liquid crystal display device has the advantages of the color filter as described above, that is, there is no color unevenness due to the pixel portion and the cell gap is uniform.

  Since the present invention includes a pixel portion flattening step after the pixel portion forming step, even in the case of a color filter in which the pixel portion is formed by a discharge method, the surface of the pixel portion is flat and uneven color in the pixel portion. Will not occur. Further, since the thickness of each pixel portion can be made constant by the pixel portion flattening step, there is an effect that there is no uneven coloring due to the pixel portion and the cell gap can be made uniform.

It is process drawing for demonstrating an example of the manufacturing method of the color filter of this invention.

A. Hereinafter, a method for producing a color filter of the present invention will be described in detail. The color filter manufacturing method of the present invention includes at least a pixel portion forming step of forming a plurality of color pixel portions in a predetermined pattern by depositing ink on a transparent substrate by a discharge method, and the pixel portion forming step In the method for manufacturing a color filter in which the pixel portion formed in the convex shape has a convex shape, the pixel portion flattening step for flattening the pixel portion having the convex shape after the pixel portion forming step is provided. .

  Since the present invention includes the pixel portion flattening step as described above, uneven coloring in the pixel portion or between the pixel portions can be prevented, and the cell gap can be kept constant. First, this pixel portion flattening step will be described in detail.

1. Pixel Part Flattening Step The pixel part flattening step in the present invention can be roughly divided into two methods. Among them, the first method is a method of flattening a pixel portion having a convex shape by applying pressure from above, and the second method is a method of removing the upper portion of the convex pixel portion.

  The method for applying pressure from above, which is the first method, is not particularly limited as long as it is a method capable of pressing the convex pixel portion uniformly by linear pressure or surface pressure. Examples of the method for applying pressure by linear pressure include a method using a cylindrical pressure roll. Examples of the method of applying pressure by surface pressure include a method using a flat press.

  In these methods, for example, a material that does not adhere to the contacted pixel portion is preferably used for a portion that contacts the pixel portion such as a cylindrical pressure roll surface or a planar press surface.

  Specifically, dimethylpolysiloxane and at least one copolymer selected from butyl acrylate, 2-ethylhexyl acrylate, butyl methacrylate, 2-isocyanatoethyl, or methacrylate, dimethylpolysiloxane, methylphenylpolysiloxane, or And methyl fluoropolysiloxane. The molecular weight of these substances is preferably 100,000 to 1,000,000 in terms of weight average molecular weight.

In such a silicone copolymer, the loss tangent tan δ is preferably 0.01 to 0.2, and the complex elastic modulus is 10 ⁶ to 10 ⁷ dyne / cm ^2. Is preferred. Furthermore, the critical surface tension is preferably 17 to 37 dyne / cm, and more preferably 20 to 26 dyne / cm.

  In addition, a film or the like is interposed in a portion that comes into contact with the pixel portion such as a cylindrical pressure roll surface or a flat press surface, and the convex portion of the pixel portion is pressed to remove the film after flattening is completed. It may be a method. Examples of the film that can be used in such a method include polyethylene terephthalate, polycarbonate, polyphenylene sulfide, polyimide, polyethylene naphthalate, polyvinyl chloride, polyethersulfone, polyamideimide, polyamide, and aromatic polyamide. it can.

  On the other hand, as a method for removing the upper portion of the convex pixel portion, which is the second method, specifically, a method of scraping the upper portion of the pixel portion using a doctor blade, or a portion of the upper portion of the pixel portion being cut using a cutter. Examples thereof include a method and a method of scraping the upper part of the pixel portion by polishing.

  The pixel portion flattening step in the present invention varies depending on the flattening method, but it is preferable to perform the pixel portion flattening step after the pixel portion is in a semi-cured state. Specifically, it is preferable to perform the pixel portion flattening step after the viscosity of the ink in the pixel portion is set in the range of 500 cps to 300,000 cps.

  In particular, when the pixel portion flattening step is a first method of flattening the pixel portion having a convex shape by applying pressure from above, it is more preferable that the pixel portion is in a semi-cured state. The viscosity is preferably in the range of 1000 cps to 20000 cps within the above range.

In this case, the viscosity of the semi-cured ink is measured by collecting the semi-cured ink with a doctor blade or a screen printing squeegee and using an R-type viscometer (for example, RE500U manufactured by Toki Sangyo Co., Ltd.) The method of measuring at is adopted. As a measurement condition, measurement is performed at a shear rate of 10 s ⁻¹ .

2. Pixel Part Forming Process The color filter manufacturing method of the present invention is characterized in that it has the above-described pixel part flattening process. As a precondition thereof, ink is deposited on a transparent substrate by a discharge method. A method for manufacturing a color filter having at least a pixel portion forming step for forming pixel portions of a plurality of colors in a predetermined pattern, and a method for manufacturing a color filter in which the pixel portion formed in the pixel portion forming step has a convex shape Applies to

(Discharge method)
Examples of the ejection method used in the present invention include a microsyringe, a dispenser, an ink jet, a method in which ink for forming a pixel portion is blown by an external stimulus such as an electric field, and a vibration element such as a piezo element that vibrates by an external stimulus. Examples thereof include a method of flying the pixel portion forming ink and a method of causing the pixel portion forming ink adhered to the needle tip to adhere to the substrate surface.

  In the present invention, among the above-described ejection methods, it is preferable to form the pixel portion by an ink jet method from the viewpoint of application accuracy and rapidity. The ink jet device used in this case is not particularly limited, however, a method in which charged ink is continuously ejected and controlled by a magnetic field, a method in which ink is ejected intermittently using a piezoelectric element, and ink is heated. Ink jet devices using various methods such as a method of intermittently jetting using the foam can be used.

  In the present invention, “attaching ink onto a transparent substrate” means not only the case where ink is directly attached onto a transparent substrate, but also that some layer is formed on the transparent substrate, and the ink is formed thereon. This also includes the case of adhering.

(Pixel part)
In this manner, the pixel portion formed by the ejection method is usually formed with three colors of red (R), green (G), and blue (B). The coloring pattern and the coloring area in the pixel portion can be arbitrarily set.

  In the case of forming such a pixel portion, it is preferable to use an ink jet method among the discharge methods as described above, but the ink used in this ink jet method is largely classified into water-based and oil-based. In the present invention, any ink can be used, but a water-based ink based on water is preferable from the viewpoint of surface tension.

  In the water-based ink used in the present invention, water alone or a mixed solvent of water and a water-soluble organic solvent can be used as a solvent. On the other hand, an oil-based ink is preferably used based on a solvent having a high boiling point in order to prevent clogging of the head. Known colorants and dyes are widely used as colorants used in such ink jet inks. Further, in order to improve dispersibility and fixability, resins that are soluble or insoluble in a solvent can be contained. Other surfactants such as nonionic surfactants, cationic surfactants and amphoteric surfactants; antiseptics; antifungal agents; pH adjusters; antifoaming agents; UV absorbers; viscosity modifiers: surface tension modifiers, etc. May be added as necessary.

  Ordinary ink jet inks cannot contain a large amount of binder resin due to their low suitable viscosity. However, the colorant itself can have fixing ability by granulating it in the form of wrapping the colorant particles in the ink. it can. Such an ink can also be used in the present invention. Furthermore, so-called hot melt inks and UV curable inks can also be used.

  In the present invention, it is particularly preferable to use a UV curable ink. By using a UV curable ink, the ink can be colored by an ink jet method to form a pixel portion, and then irradiated with UV, whereby the ink can be quickly cured and immediately sent to the next step. Therefore, a color filter can be manufactured efficiently.

  Such a UV curable ink is mainly composed of a prepolymer, a monomer, a photoinitiator and a colorant. As the prepolymer, any of prepolymers such as polyester acrylate, polyurethane acrylate, epoxy acrylate, polyether acrylate, oligo acrylate, alkyd acrylate, polyol acrylate, and silicon acrylate can be used without any particular limitation.

  Monomers include vinyl monomers such as styrene and vinyl acetate; monofunctional acrylic monomers such as n-hexyl acrylate and phenoxyethyl acrylate; diethylene glycol diacrylate, 1,6-hexanediol diacrylate, hydroxypiperic acid ester neopentyl glycol diacrylate Polyfunctional acrylic monomers such as trimethylolpropane triacrylate and dipentaerystol hexaacrylate can be used. The prepolymer and the monomer may be used alone or in combination of two or more.

  Photopolymerization initiators are isobutyl benzoin ether, isopropyl benzoin ether, benzoin ethyl ether, benzoin methyl ether, 1-phenyl-1,2-propadion-2-oxime, 2,2-dimethoxy-2-phenylacetophenone, benzyl, hydroxy Cyclohexyl phenyl ketone, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzophenone, chlorothioxanthone, 2-chlorothioxanthone, isopropylthioxanthone, 2-methylthioxanthone, chlorine-substituted benzophenone, halogen-substituted alkyl -From the allyl ketone etc., what can obtain desired hardening characteristics and recording characteristics can be selected and used. In addition, photoinitiators such as aliphatic amines and aromatic amines; and photosensitizers such as thioxanthone may be added as necessary.

(About convex pixel part)
In addition, the present invention is applied when the pixel portion formed in the pixel portion forming step has a convex shape. Here, the pixel portion having a convex shape means a case where the inner highest portion is at least 1 μm or more, preferably 2 μm or more, compared to the average height around the pixel portion at the end of the pixel portion formation process. Is. This is because the necessity of performing the above-described pixel portion flattening step is not so high unless there is such a height difference.

  As described above, there are various pixel part forming methods in which a pixel portion is formed by depositing ink on a transparent substrate by an ejection method, and the formed pixel portion has a convex shape. However, the present invention is not limited to this pixel portion forming method. As a specific method, for example, a convex portion is formed around the pixel portion forming portion where the pixel portion is formed in advance before forming the pixel portion, and a discharge method is used in the pixel portion forming portion surrounded by the convex portion. A method of adhering ink, a wettability variable layer that changes wettability due to external stimuli on a transparent substrate, an external stimulus is added to the pattern to change the wettability, and a discharge method is applied to areas with good wettability Examples include a method of forming a pixel portion by attaching ink.

  In the present invention, it is particularly preferable to form the wettability variable layer capable of changing the wettability by the external stimulus described above and form the pixel portion thereon. According to this method, by applying an external stimulus to the pattern, it is possible to easily form patterns with different wettability, and by simply applying ink to the portion with good wettability among these by an ejection method. This is because the pixel portion can be formed efficiently.

  Hereinafter, such a wettability variable layer will be described.

(Wettability variable layer)
The wettability variable layer used in the present invention is not particularly limited as long as the wettability of the surface can be changed by an external stimulus such as a physical stimulus or a chemical stimulus. For example, the surface roughness may be changed by acid or alkali, and the wettability may be changed. The wettability variable layer may be formed by irradiation with energy such as ultraviolet rays, visible light, or heat. It may be a layer or the like in which the wettability is changed by changing the substance inside.

  Regarding the change in wettability, even if the wettability variable layer changes so that the contact angle with the liquid is large before the stimulus is applied and the contact angle with the liquid is small after the stimulus is applied. Alternatively, it may be a wettability variable layer in which the contact angle with the liquid is small before the stimulus is applied and the contact angle with the liquid changes greatly after the stimulus is applied.

(Photocatalyst containing layer)
In the present invention, the wettability variable layer is preferably a photocatalyst-containing layer whose wettability changes so that the contact angle with the liquid is reduced by energy irradiation. In this way, the wettability is reduced so that the contact angle with the liquid is reduced by exposure (in the present invention, not only light is irradiated but also energy is applied). By providing a photocatalyst-containing layer that changes, wettability can be easily changed by performing pattern irradiation of energy, etc., and an ink-philic region having a small contact angle with the liquid can be formed. It is possible to easily make an ink-philic region only in the portion. Therefore, a color filter can be manufactured efficiently, which is advantageous in terms of cost. In this case, light containing ultraviolet light is usually used as energy.

  Here, the ink-philic region is a region having a small contact angle with the liquid and means a region having good wettability with respect to ink or the like by the ejection method. In addition, the ink repellent region is a region having a large contact angle with the liquid and means a region having poor wettability with respect to ink or the like by the ejection method.

  In the unexposed portion, the photocatalyst-containing layer has a contact angle with a liquid with a surface tension of 40 mN / m of 10 degrees or more, preferably a contact angle with a liquid with a surface tension of 30 mN / m of 10 degrees or more, particularly a surface The contact angle with a liquid having a tension of 20 mN / m is preferably 10 degrees or more. This is because the unexposed part is a part that requires ink repellency in the present invention, and therefore, when the contact angle with the liquid is small, the ink repellency is not sufficient and the ink may remain. This is because it is not preferable because of the occurrence of properties.

  In addition, the photocatalyst-containing layer has a contact angle with a liquid that decreases when exposed to light, and a contact angle with a liquid with a surface tension of 40 mN / m is less than 10 degrees, preferably a liquid with a surface tension of 50 mN / m. It is preferable that the layer has a contact angle with a liquid of 10 degrees or less, particularly a surface tension of 60 mN / m, of 10 degrees or less. This is because if the contact angle between the exposed portion and the liquid is high, the spread of ink in this portion may be inferior, and color loss in the pixel portion may occur.

  In addition, the contact angle with the liquid here is measured using a contact angle measuring instrument (Kyowa Interface Science Co., Ltd. CA-Z type) with a liquid having various surface tensions (from the microsyringe to the liquid. 30 seconds after dropping), and the result was obtained or the result was graphed. In this measurement, as a liquid having various surface tensions, a wetting index standard solution manufactured by Pure Chemical Co., Ltd. was used.

  The photocatalyst-containing layer of the present invention is preferably composed of at least a photocatalyst and a binder. By using such a layer, the critical surface tension can be increased by the action of the photocatalyst by light irradiation, and the contact angle with the liquid can be decreased.

  In such a photocatalyst-containing layer, the mechanism of action of a photocatalyst represented by titanium oxide as described later is not necessarily clear, but carriers generated by light irradiation react directly with nearby compounds, or It is considered that the active oxygen species generated in the presence of oxygen and water change the chemical structure of organic matter.

  When a photocatalyst-containing layer is used as the wettability variable layer in the present invention, the photocatalyst is used to change the wettability of the exposed portion by using an action such as oxidation or decomposition of an organic group or additive that is part of the binder. It can be made ink-philic and can make a great difference in wettability with the non-exposed portion. Therefore, by improving the receptivity (ink affinity) and repellent property (ink repellency) with the ink by the ejection method, a color filter having good quality and advantageous in terms of cost can be obtained.

  Further, when such a photocatalyst containing layer is used in the present invention, the photocatalyst containing layer contains at least a photocatalyst and fluorine, and the fluorine content on the surface of the photocatalyst containing layer irradiates the photocatalyst containing layer with energy. In this case, the photocatalyst-containing layer may be formed so as to be lower than that before energy irradiation due to the action of the photocatalyst.

  In a color filter having such a feature, a pattern composed of a portion having a low fluorine content can be easily formed by irradiating energy with a pattern. Here, fluorine has an extremely low surface energy. Therefore, the surface of a substance containing a large amount of fluorine has a smaller critical surface tension. Therefore, the critical surface tension of the portion having a small fluorine content is larger than the critical surface tension of the surface of the portion having a large fluorine content. This means that the portion with a low fluorine content is an ink-philic region compared to the portion with a high fluorine content. Therefore, forming a pattern composed of a portion having a lower fluorine content than the surrounding surface forms a pattern of an ink-philic region in the ink repellent region.

  Therefore, when such a photocatalyst-containing layer is used, the pattern of the ink-repellent region can be easily formed in the ink-repellent region by irradiating the pattern with energy. Thus, it is possible to easily form a pixel portion or the like, and a color filter with good quality can be obtained.

  As described above, the fluorine content contained in the fluorine-containing photocatalyst-containing layer is a portion where the fluorine content in the low ink content region formed by irradiation with energy is not irradiated with energy. When the fluorine content is 100, it is preferably 10 or less, preferably 5 or less, particularly preferably 1 or less.

  By setting it within such a range, it is possible to make a great difference in the ink affinity between the energy irradiated portion and the unirradiated portion. Therefore, by forming a pixel portion or the like in such a photocatalyst-containing layer, it becomes possible to form the pixel portion or the like accurately only in the ink-philic region having a reduced fluorine content, and to obtain a color filter with high accuracy. Because you can. This rate of decrease is based on weight.

  For the measurement of the fluorine content in the photocatalyst-containing layer, various commonly used methods can be used. For example, X-ray photoelectron spectroscopy (ES-ray photoelectron spectroscopy, ESCA) for Chemical Analysis)), and any method that can quantitatively measure the amount of fluorine on the surface, such as X-ray fluorescence analysis and mass spectrometry, is not particularly limited.

Examples of photocatalysts used in the present invention include titanium oxide (TiO ₂ ), zinc oxide (ZnO), tin oxide (SnO ₂ ), strontium titanate (SrTiO ₃ ), tungsten oxide (WO ₃ ), which are known as optical semiconductors. Bismuth oxide (Bi ₂ O ₃ ) and iron oxide (Fe ₂ O ₃ ) can be mentioned, and one or a mixture of two or more selected from these can be used.

  In the present invention, titanium oxide is particularly preferably used because it has a high band gap energy, is chemically stable, has no toxicity, and is easily available. Titanium oxide includes anatase type and rutile type, and both can be used in the present invention, but anatase type titanium oxide is preferable. Anatase type titanium oxide has an excitation wavelength of 380 nm or less.

  Examples of such anatase-type titanium oxide include hydrochloric acid peptizer-type anatase-type titania sol (STS-02 manufactured by Ishihara Sangyo Co., Ltd., average particle size 7 nm), ST-K01 manufactured by Ishihara Sangyo Co., Ltd. An anatase type titania sol (TA-15 manufactured by Nissan Chemical Co., Ltd. (average particle size 12 nm)) and the like can be mentioned.

  The smaller the particle size of the photocatalyst, the more effective the photocatalytic reaction occurs. The average particle size is preferably 50 nm or less, and it is particularly preferable to use a photocatalyst of 20 nm or less. Further, the smaller the particle size of the photocatalyst, the smaller the surface roughness of the formed photocatalyst-containing layer, which is preferable. When the particle size of the photocatalyst exceeds 100 nm, the centerline average surface roughness of the photocatalyst-containing layer becomes coarse, and the photocatalyst This is not preferable because the ink repellency of the non-exposed portion of the containing layer is lowered and the ink affinity of the exposed portion becomes insufficient.

  The color filter of the present invention contains fluorine on the surface of the photocatalyst containing layer as described above, and reduces the fluorine content on the surface of the photocatalyst containing layer by pattern irradiating energy on the surface of the photocatalyst containing layer. Alternatively, a color filter obtained by forming a pattern of an ink-philic region in the color region and forming a pixel portion or the like therein may be used. Even in this case, it is preferable to use the titanium dioxide as described above as the photocatalyst. However, the content of fluorine contained in the photocatalyst containing layer in the case of using titanium dioxide in this way is X-ray photoelectron. When analyzed and quantified by spectroscopy, when the titanium (Ti) element is defined as 100, the fluorine (F) element is in a ratio of 500 or more, preferably 800 or more, particularly preferably 1200 or more. It is preferable that the element is contained on the surface of the photocatalyst containing layer.

  By including fluorine (F) in the photocatalyst-containing layer to such an extent, the critical surface tension on the photocatalyst-containing layer can be sufficiently lowered, so that the ink repellency on the surface can be ensured, thereby irradiating the pattern with energy. This is because the difference in wettability with the ink-affinity region on the surface in the pattern portion where the fluorine content is reduced can be increased, and the quality of the color filter finally obtained can be improved.

  Further, in such a color filter, the fluorine content in the parent ink region formed by pattern irradiation of energy is 50 or less when the titanium (Ti) element is 100, preferably It is preferably contained in a ratio of 20 or less, particularly preferably 10 or less.

  If the fluorine content in the photocatalyst-containing layer can be reduced to this extent, sufficient ink affinity can be obtained for forming the pixel portion and the like, and the ink repellency of the portion where the energy is not irradiated. Due to the difference in wettability, the pixel portion and the like can be formed with high accuracy, and a color filter with good quality can be obtained.

  In the present invention, the binder used in the photocatalyst-containing layer preferably has a high binding energy such that the main skeleton is not decomposed by the photoexcitation of the photocatalyst. For example, (1) chloro or alkoxysilane or the like by sol-gel reaction or the like. Examples include organopolysiloxanes that exhibit high strength by hydrolysis and polycondensation, and (2) organopolysiloxanes crosslinked with reactive silicones that are excellent in water repellency and oil repellency.

In the case of (1) above, the general formula: Y _n SiX _(4-n) (where Y represents an alkyl group, a fluoroalkyl group, a vinyl group, an amino group, a phenyl group or an epoxy group, and X represents an alkoxyl group. , An acetyl group or a halogen, n is an integer of 0 to 3.) is an organopolysiloxane which is one or more hydrolytic condensates or cohydrolytic condensates of a silicon compound represented by It is preferable. Here, the number of carbon atoms of the group represented by Y is preferably in the range of 1 to 20, and the alkoxy group represented by X is a methoxy group, an ethoxy group, a propoxy group, or a butoxy group. preferable.

  Specifically, methyltrichlorosilane, methyltribromosilane, methyltrimethoxysilane, methyltriethoxysilane, methyltriisopropoxysilane, methyltri-t-butoxysilane; ethyltrichlorosilane, ethyltribromosilane, ethyltrimethoxysilane, Ethyltriethoxysilane, ethyltriisopropoxysilane, ethyltri-t-butoxysilane; n-propyltrichlorosilane, n-propyltribromosilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, n-propyltriisopropoxy Silane, n-propyltri-t-butoxysilane; n-hexyltrichlorosilane, n-hexyltribromosilane, n-hexyltrimethoxysilane, n-hexyltriethoxysilane, n-hexyl Lutriisopropoxysilane, n-hexyltri-t-butoxysilane; n-decyltrichlorosilane, n-decyltribromosilane, n-decyltrimethoxysilane, n-decyltriethoxysilane, n-decyltriisopropoxysilane, n -Decyltri-t-butoxysilane; n-octadecyltrichlorosilane, n-octadecyltribromosilane, n-octadecyltrimethoxysilane, n-octadecyltriethoxysilane, n-octadecyltriisopropoxysilane, n-octadecyltri-t-butoxysilane Phenyltrichlorosilane, phenyltribromosilane, phenyltrimethoxysilane, phenyltriethoxysilane, phenyltriisopropoxysilane, phenyltri-t-butoxysilane; tetrachlorosilane Tetrabromosilane, tetramethoxysilane, tetraethoxysilane, tetrabutoxysilane, dimethoxydiethoxysilane; dimethyldichlorosilane, dimethyldibromosilane, dimethyldimethoxysilane, dimethyldiethoxysilane; diphenyldichlorosilane, diphenyldibromosilane, Diphenyldimethoxysilane, diphenyldiethoxysilane; phenylmethyldichlorosilane, phenylmethyldibromosilane, phenylmethyldimethoxysilane, phenylmethyldiethoxysilane; trichlorohydrosilane, tribromohydrosilane, trimethoxyhydrosilane, triethoxyhydrosilane, triisopropoxy Hydrosilane, tri-t-butoxyhydrosilane; vinyltrichlorosilane, vinyltribromosilane, vinyltri Methoxysilane, vinyltriethoxysilane, vinyltriisopropoxysilane, vinyltrit-butoxysilane; trifluoropropyltrichlorosilane, trifluoropropyltribromosilane, trifluoropropyltrimethoxysilane, trifluoropropyltriethoxysilane, trifluoropropyl Triisopropoxysilane, trifluoropropyltri-t-butoxysilane; γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxy Propyltriethoxysilane, γ-glycidoxypropyltriisopropoxysilane, γ-glycidoxypropyltri-t-butoxysilane; γ-methacryloxypropylmethyldimethyl Xysilane, γ-methacryloxypropylmethyldiethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, γ-methacryloxypropyltriisopropoxysilane, γ-methacryloxypropyl Tri-t-butoxysilane; γ-aminopropylmethyldimethoxysilane, γ-aminopropylmethyldiethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropyltriisopropoxysilane, γ- Aminopropyltri-t-butoxysilane; γ-mercaptopropylmethyldimethoxysilane, γ-mercaptopropylmethyldiethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltrieth Xysilane, γ-mercaptopropyltriisopropoxysilane, γ-mercaptopropyltri-t-butoxysilane; β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltriethoxysilane And partial hydrolysates thereof; and mixtures thereof can be used.

  As the binder, polysiloxane containing a fluoroalkyl group can be particularly preferably used. Specifically, one or more of the following hydrocondensation condensates and cohydrolysis condensates of fluoroalkylsilanes can be used. And those generally known as fluorine-based silane coupling agents can be used.

CF ₃ (CF ₂ ) ₃ CH ₂ CH ₂ Si (OCH ₃ ) ₃ ; CF ₃ (CF ₂ ) ₅ CH ₂ CH ₂ Si (OCH ₃ ) ₃ ; CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ Si (OCH ₃ ) ₃ ; CF ₃ (CF ₂ ) ₉ CH ₂ CH ₂ Si (OCH ₃ ) ₃ ; (CF ₃ ) ₂ CF (CF ₂ ) ₄ CH ₂ CH ₂ Si (OCH ₃ ) ₃ ; (CF ₃ ) ₂ CF _{(CF 2) 6 CH 2 CH} 2 Si (OCH 3) 3; (CF 3) 2 CF (CF 2) 8 CH 2 CH 2 Si (OCH 3) 3; CF 3 (C 6 H 4) C 2 H 4 Si (OCH ₃ ) ₃ ; CF ₃ (CF ₂ ) ₃ (C ₆ H ₄ ) C ₂ H ₄ Si (OCH ₃ ) ₃ ; CF ₃ (CF ₂ ) ₅ (C ₆ H ₄ ) C ₂ H ₄ Si ( _{OCH 3) 3; CF 3 (} CF 2) 7 (C 6 H 4) C 2 H 4 Si (OCH 3) 3; CF 3 (CF 2) 3 CH 2 CH 2 SiCH 3 (OCH 3) 2; CF 3 (C _{2) 5 CH 2 CH 2 SiCH} 3 (OCH 3) 2; CF 3 (CF 2) 7 CH 2 CH 2 SiCH 3 (OCH 3) 2; CF 3 (CF 2) 9 CH 2 CH 2 SiCH 3 (OCH 3 _{) 2; (CF 3) 2} CF (CF 2) 4 CH 2 CH 2 SiCH 3 (OCH 3) 2; (CF 3) 2 CF (CF 2) 6 CH 2 CH 2 Si CH 3 (OCH 3) 2; _{(CF 3) 2 CF (CF} 2) 8 CH 2 CH 2 Si CH 3 (OCH 3) 2; CF 3 (C 6 H 4) C 2 H 4 SiCH 3 (OCH 3) 2; CF 3 (CF 2) ₃ (C ₆ H ₄ ) C ₂ H ₄ SiCH ₃ (OCH ₃ ) ₂ ; CF ₃ (CF ₂ ) ₅ (C ₆ H ₄ ) C ₂ H ₄ SiCH ₃ (OCH ₃ ) ₂ ; CF ₃ (CF ₂ ) ₇ (C ₆ H ₄ ) C ₂ H ₄ SiCH ₃ (OCH ₃ ) ₂ ; CF ₃ (CF ₂ ) ₃ CH ₂ CH ₂ Si (OCH ₂ CH ₃ ) ₃ ; CF ₃ (C F ₂ ) ₅ CH ₂ CH ₂ Si (OCH ₂ CH ₃ ) ₃ ; CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ Si (OCH ₂ CH ₃ ) ₃ ; CF ₃ (CF ₂ ) ₉ CH ₂ CH ₂ Si ( OCH ₂ CH ₃ ) ₃ ; CF ₃ (CF ₂ ) ₇ SO ₂ N (C ₂ H ₅ ) C ₂ H ₄ CH ₂ Si (OCH ₃ ) ₃

  By using a polysiloxane containing a fluoroalkyl group as described above as a binder, the ink repellency of the non-exposed part of the photocatalyst-containing layer is greatly improved, and the function of preventing the adhesion of the light-shielding part paint or the ink for ink jet system. To express.

  Examples of the reactive silicone (2) include compounds having a skeleton represented by the following general formula.

However, n is an integer of 2 or more, R ^1, R ² are each a substituted or unsubstituted alkyl having 1 to 10 carbon atoms, alkenyl, aryl or cyanoalkyl group, the total molar ratio of 40% or less Vinyl, phenyl and phenyl halide. In addition, it is preferable that R ¹ and R ² are methyl groups because the surface energy is the smallest, and it is preferable that the methyl groups are 60% or more by molar ratio. In addition, the chain end or side chain has at least one reactive group such as a hydroxyl group in the molecular chain.

  In addition to the above organopolysiloxane, a stable organosilicon compound that does not undergo a crosslinking reaction, such as dimethylpolysiloxane, may be mixed in the binder.

  In the color filter of the present invention, various binders such as organopolysiloxane can be used in the photocatalyst-containing layer. In the present invention, as described above, the photocatalyst-containing layer containing such a binder and the photocatalyst contains fluorine, and the pattern is irradiated with energy to reduce the fluorine on the surface of the photocatalyst-containing layer. An ink-philic region may be formed inside. At this time, it is necessary to contain fluorine in the photocatalyst-containing layer. As a method of incorporating fluorine into the photocatalyst-containing layer containing such a binder, a fluorine compound is relatively used for a binder having a high binding energy. Examples thereof include a method of bonding with weak binding energy and a method of mixing a fluorine compound bonded with relatively weak binding energy into the photocatalyst containing layer. By introducing fluorine by such a method, when energy is irradiated, a fluorine bonding site having a relatively low binding energy is first decomposed, and thus fluorine can be removed from the photocatalyst containing layer. is there.

  Examples of the first method, that is, a method of bonding a fluorine compound with a relatively weak binding energy to a binder having a high binding energy include a method of introducing a fluoroalkyl group as a substituent into the organopolysiloxane. be able to.

For example, as described in (1) above, as a method for obtaining an organopolysiloxane, an organopolysiloxane exhibiting high strength can be obtained by hydrolyzing and polycondensing chloro or alkoxysilane, etc. by sol-gel reaction or the like. . Here, in this method, as described above, the general formula: Y _n SiX _(4-n)
(Here, Y represents an alkyl group, a fluoroalkyl group, a vinyl group, an amino group, a phenyl group or an epoxy group, X represents an alkoxyl group, an acetyl group or a halogen. N is an integer from 0 to 3. The organopolysiloxane is obtained by hydrolyzing or co-hydrolyzing and condensing one or two or more of the silicon compounds represented by), and in this general formula, the substituent Y has a fluoroalkyl group. By synthesizing using a silicon compound, an organopolysiloxane having a fluoroalkyl group as a substituent can be obtained. When an organopolysiloxane having such a fluoroalkyl group as a substituent is used as a binder, the carbon bond portion of the fluoroalkyl group is decomposed by the action of the photocatalyst in the photocatalyst-containing layer when irradiated with energy. Therefore, the fluorine content in the portion where the photocatalyst-containing layer surface is irradiated with energy can be reduced.

  The silicon compound having a fluoroalkyl group used at this time is not particularly limited as long as it has a fluoroalkyl group, but has at least one fluoroalkyl group, and the carbon number of the fluoroalkyl group A silicon compound in which is 4 to 30, preferably 6 to 20, particularly preferably 6 to 16, is preferably used. Specific examples of such a silicon compound are as described above, and among these, the above silicon compound having a fluoroalkyl group having 6 to 8 carbon atoms, that is, a fluoroalkylsilane is preferable.

  In the present invention, such a silicon compound having a fluoroalkyl group may be used in combination with the above-mentioned silicon compound having no fluoroalkyl group, and these cohydrolyzed condensates may be used as the organopolysiloxane. In addition, one or two or more silicon compounds having such a fluoroalkyl group may be used, and these hydrolyzed condensates and cohydrolyzed condensates may be used as the organopolysiloxane.

  In the organopolysiloxane having a fluoroalkyl group thus obtained, among the silicon compounds constituting the organopolysiloxane, the silicon compound having the fluoroalkyl group is 0.01 mol% or more, preferably 0.1%. It is preferable that it is contained in mol% or more.

  By including the fluoroalkyl group to such an extent, the ink repellency on the photocatalyst-containing layer can be increased, and the difference in wettability with the portion that is irradiated with energy to form the ink-philic region can be increased. Because.

In the method shown in (2) above, organopolysiloxane is obtained by crosslinking reactive silicone having excellent water repellency and oil repellency. In this case as well, R in the above general formula is similarly used. ^{By making} either or both of R ¹ and R ² a substituent containing fluorine such as a fluoroalkyl group, it is possible to include fluorine in the photocatalyst containing layer, and when energy is irradiated, Since the portion of the fluoroalkyl group having a bond energy smaller than that of the siloxane bond is decomposed, the fluorine content on the surface of the photocatalyst containing layer can be reduced by energy irradiation.

  On the other hand, as a method for introducing a fluorine compound bonded with energy lower than the binding energy of the binder, for example, when introducing a low molecular weight fluorine compound, for example, a fluorine-based surfactant is mixed. Examples of the method of introducing a high molecular weight fluorine compound include a method of mixing a fluorine resin having high compatibility with the binder resin.

  In the present invention, the photocatalyst-containing layer can contain a surfactant in addition to the above-mentioned photocatalyst and binder. Specifically, hydrocarbons such as NIKKOLBL, BC, BO, BB series manufactured by Nikko Chemicals Co., Ltd., ZONYL FSN, FSO manufactured by DuPont, Surflon S-141, 145 manufactured by Asahi Glass Co., Ltd., Dainippon Ink Chemical industry Co., Ltd. MegaFuck F-141, 144, Neos Co., Ltd., Fategent F-200, F251, Daikin Industries Co., Ltd. Unidyne DS-401, 402, 3M Co., Ltd. Fluorado FC-170, Fluorine-based or silicone-based nonionic surfactants such as 176 can be mentioned, and cationic surfactants, anionic surfactants, and amphoteric surfactants can also be used.

  In addition to the above surfactants, the photocatalyst-containing layer includes polyvinyl alcohol, unsaturated polyester, acrylic resin, polyethylene, diallyl phthalate, ethylene propylene diene monomer, epoxy resin, phenol resin, polyurethane, melamine resin, polycarbonate, Polyvinyl chloride, polyamide, polyimide, styrene butadiene rubber, chloroprene rubber, polypropylene, polybutylene, polystyrene, polyvinyl acetate, polyester, polybutadiene, polybenzimidazole, polyacrylonitrile, epichlorohydrin, polysulfide, polyisoprene, oligomers, polymers, etc. It can be included.

  The content of the photocatalyst in the photocatalyst containing layer can be set in the range of 5 to 60% by weight, preferably 20 to 40% by weight. The thickness of the photocatalyst containing layer is preferably in the range of 0.05 to 10 μm.

  The photocatalyst-containing layer can be formed by dispersing a photocatalyst and a binder in a solvent together with other additives as necessary to prepare a coating solution, and applying the coating solution. As the solvent to be used, alcohol-based organic solvents such as ethanol and isopropanol are preferable. The coating can be performed by a known coating method such as spin coating, spray coating, dip coating, roll coating or bead coating. When an ultraviolet curable component is contained as the binder, the photocatalyst-containing layer can be formed by irradiating ultraviolet rays and performing a curing treatment.

(Transparent substrate)
The transparent substrate used in the method for producing a color filter of the present invention is not particularly limited as long as it is conventionally used in a color filter. For example, quartz glass, Pyrex (registered trademark) glass, synthetic A transparent rigid material having no flexibility, such as a quartz plate, or a transparent flexible material having flexibility, such as a transparent resin film or an optical resin plate, can be used. Among them, Corning 7059 glass is a material having a small coefficient of thermal expansion, excellent dimensional stability and workability in high-temperature heat treatment, and is an alkali-free glass containing no alkali component in the active matrix. Suitable for color filters for color liquid crystal display devices. In the present invention, a transparent substrate is usually used, but a reflective substrate or a white substrate can also be used. Further, the transparent substrate may be subjected to surface treatment for preventing alkali elution, imparting a gas barrier property or other purposes as required.

3. Others The method for producing a color filter of the present invention may include a step of producing members constituting various color filters as necessary.

(Shading part forming process)
In the manufacturing method of the color filter of this invention, you may have a light-shielding part formation process which forms a light-shielding part (black matrix). This light shielding portion forming step may be performed before the pixel portion forming step described above, or may be performed after the pixel portion forming step is performed.

  Such a light shielding part forming step may be a method of forming a thin metal film of chromium or the like having a thickness of about 1000 to 2000 mm by, for example, a sputtering method, a vacuum deposition method, or the like, and patterning the thin film. As the patterning method, a normal patterning method such as sputtering can be used.

  Moreover, the method of forming the light-shielding part which contained light-shielding particles, such as carbon microparticles, a metal oxide, an inorganic pigment, and an organic pigment, in the resin binder may be used. As the resin binder to be used, polyimide resin, acrylic resin, epoxy resin, polyacrylamide, polyvinyl alcohol, gelatin, casein, cellulose, or a mixture of one or more kinds, photosensitive resin, or O / A W emulsion type resin composition, for example, an emulsion of a reactive silicone can be used. The thickness of such a resin light-shielding portion can be set within a range of 0.5 to 10 μm. As a method for patterning the resin light-shielding portion, a generally used method such as a photolithography method or a printing method can be used.

(Protective layer forming step)
In the method for manufacturing a color filter of the present invention, a protective layer forming step of forming a protective layer on the pixel portion may be further performed. This protective layer is provided to flatten the color filter and to prevent elution of the components contained in the pixel portion or the pixel portion and the photocatalyst containing layer into the liquid crystal layer.

  The thickness of the protective layer can be set in consideration of the light transmittance of the material used, the surface state of the color filter, and the like, and can be set, for example, in the range of 0.1 to 2.0 μm. The protective layer can be formed using, for example, a known transparent photosensitive resin, two-component curable transparent resin, or the like having a light transmittance required as a transparent protective layer.

4). Hereinafter, an example of the manufacturing method of the color filter of the present invention will be described with reference to FIG.

  In this example, first, a transparent substrate 2 on which a light shielding portion 1 is formed is prepared (FIG. 1A). Next, the photocatalyst containing layer 3 is formed on the surface of the transparent substrate 2 on the side where the light shielding portion 1 is formed. Next, exposure is performed using the mask 4 so as to expose only the pixel portion forming portion where the pixel portion on the photocatalyst containing layer 3 is formed (FIG. 1B). The pixel part forming part on the photocatalyst containing layer 3 is exposed to be an ink-philic pixel part exposure part 5 (FIG. 1C). Ink 6 is deposited on the pixel portion exposure portion 5 by a discharge method (FIG. 1D). Here, the ink 6 is semi-cured as necessary. The ink 6 is pressed by a flat press 7 in this example (FIG. 1E). Finally, a flat pixel portion 8 is formed by performing a curing process of the ink 6 (FIG. 1F). Thereafter, a transparent electrode layer, a protective layer, and the like are formed as necessary to form a color filter.

B. Next, the color filter of the present invention will be described. The color filter of the present invention has at least a transparent substrate and a pixel portion in which a plurality of colors are formed in a predetermined pattern by depositing ink on the transparent substrate by a discharge method, and the thickness of each pixel portion Is within the range of ± 0.5 μm, preferably within the range of ± 0.3 μm, particularly preferably within the range of ± 0.1 μm.

  In the color filter of the present invention, since the difference in thickness of each pixel portion is in the above-described range, it is possible to make the cell gap uniform in the case of a color liquid crystal display device, and there is no high color unevenness. A quality color filter can be obtained.

  Such a color filter having a small difference in thickness of each pixel portion can be manufactured by, for example, the above-described color filter manufacturing method.

  The transparent substrate, the discharge method, the pixel portion, and the like of the color filter of the present invention are the same as those described in the color filter manufacturing method, and thus the description thereof is omitted here. Similarly to the color filter manufacturing method described above, the color filter of the present invention may have a light shielding portion (black matrix) formed thereon. Further, the point that the pixel portion is preferably formed by an ink jet method, the point that the pixel portion is preferably formed by a UV curable ink, and the like are also as described in the method for manufacturing a color filter. .

C. Color liquid crystal display device A color liquid crystal display device is formed by combining the color filter described above and a counter substrate facing the color filter, and enclosing a liquid crystal compound therebetween. The color liquid crystal display device thus obtained has the advantage that the color filter of the present invention has, that is, the advantage that the cell gap can be made uniform and that defects such as color unevenness can be reduced. It is what you have.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

  Hereinafter, the present invention will be described in more detail through examples.

1. Formation of Photocatalyst Containing Layer 3 g of isopropyl alcohol and fluoroalkylsilane (trade name: MF-160E, N- [3- (trimethoxysilyl) propyl] -N-ethylperfluorooctanesulfonamide, manufactured by Tochem Products Co., Ltd.) Isopropyl ether 50 wt% solution) 0.001 g and titanium oxide sol (Ishihara Sangyo Co., Ltd., trade name: ST-K01) 2 g were mixed and stirred at 100 ° C. for 20 minutes.

  This solution is coated by spin coating on a transparent substrate made of soda glass having a black matrix (light-shielding portion) made of a chromium thin film pattern having a thickness of 0.7 mm, an opening of 90 μm × 300 μm, and a line width of 30 μm, and 150 minutes for 150 minutes. After heating at 0 ° C., a photocatalyst-containing layer having a thickness of 0.15 μm was obtained.

  As a result of measuring the contact angle of this photocatalyst-containing layer with a 40 mN / m wetting index standard solution (manufactured by Junsei Chemical Co., Ltd.) using a contact angle measuring device (CA-Z type manufactured by Kyowa Interface Science Co., Ltd.), 70 ° Met.

Next, the surface of the photocatalyst-containing layer was irradiated with ultraviolet rays at an illuminance of 20 mW / cm ² (365 nm) with an ultra-high pressure mercury lamp. As a result, the contact angle with respect to a 40 mN / m wetting index standard solution was 120 seconds. It cost.

2. Formation of Pixel Part The transparent substrate on which the photocatalyst-containing layer is formed is irradiated with a mercury lamp (wavelength 365 nm) through a mask for red pattern, green pattern, and blue pattern (70 mW / cm ² for 50 seconds), The irradiated portions of the red pattern, the green pattern, and the blue pattern were collectively set as an ink-philic region (10 ° or less in terms of water contact angle).

  The red pattern, the green pattern, and the blue pattern on the mask are formed adjacent to each other, and the pattern interval of each color is formed with a black matrix line width or less.

  On the other hand, 1 g of CI Pigment Red 168 was mixed with 10 g of an aqueous solution obtained by diluting an aqueous emulsion silicone (trade name: K-768, manufactured by Shin-Etsu Chemical Co., Ltd.) with water three times. After the kneaded meat was dispersed with a roll, it was centrifuged at 12000 rpm, and then filtered through a 1 μm glass filter. 0.1 g of Catalyst PM-6A: Catalyst PM-6B = 4: 6 (manufactured by Shin-Etsu Chemical Co., Ltd.) is added to the resulting aqueous colored resin solution as a curing catalyst, and a red pattern coating solution (heat A curable resin composition) was prepared.

  Next, the red pattern coating solution was selectively dropped onto the red ink-philic region of the red pattern on the photocatalyst containing layer by a discharge nozzle. Then, the red pattern was made into the semi-hardened state by heat-processing for 30 second at 100 degreeC.

  Next, 1 g of CI Pigment Blue 60 was mixed with 10 g of an aqueous solution obtained by diluting water-based emulsion silicone (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: K-768) three times with water, and the coating for the red pattern was applied. In the same manner as the liquid, a blue pattern coating liquid (thermosetting resin composition) was prepared. And the said blue pattern coating liquid was selectively dripped at the ink affinity area | region of the blue pattern on a photocatalyst content layer with the discharge nozzle. Then, the blue pattern was made into the semi-hardened state by heat-processing for 30 second at 100 degreeC.

  Next, 1 g of Lionol Green 2Y-301 (manufactured by Toyo Ink Mfg. Co., Ltd.) was mixed with 10 g of a 10 wt% aqueous solution of polyvinyl alcohol (average polymerization degree 1750, saponification degree 88 mol%), and the resulting mixture was obtained. Was ground with three rolls, centrifuged at 12000 rpm, and then filtered through a 1 μm glass filter. To the obtained aqueous colored resin solution, 1% by weight of ammonium dichromate was added as a crosslinking agent to prepare a coating solution (photosensitive resin composition) for green pattern.

  Next, the coating liquid for green pattern was selectively dropped onto the ink-philic region of the green pattern on the photocatalyst containing layer by a discharge nozzle. Thereafter, heat treatment was performed at 100 ° C. for 30 seconds to make the green pattern semi-cured.

3. Pixel part flattening step Next, the three-color pattern in the semi-cured state on the glass substrate is subjected to a blanket roll under the conditions of roll pressure: 1 kg / cm ² , conveyance speed: 5 m / min, roll surface temperature: 23 ° C. It was passed and crushed by applying a constant speed and a constant pressure so as to spread a uniform linear pressure over the entire surface of the glass substrate. The blanket roll surface was made of 1-mm thick phenyl-methyl silicone rubber, and had a rubber surface roughness Ra of 1 μm or less and a hardness of 50-80 °. After crushing the colored pattern, a curing process was performed at 180 ° C. for 20 minutes to form a pixel portion on a glass substrate.

4). Formation and Evaluation of Color Filter Next, as a protective layer, a two-component mixed thermosetting agent (manufactured by Nippon Synthetic Rubber Co., Ltd., trade name: SS7265) was applied onto the colored layer with a spin coater, and 200 ° C., 30 A protective layer was formed by performing a curing process for a minute, and the color filter of the present invention was obtained.

  The obtained color filter was of high quality with no color unevenness in the pixel portion. Further, when the difference in thickness between the pixel portions was measured, it was found to be a color filter having a flat surface within 0.2 μm.

DESCRIPTION OF SYMBOLS 1 ... Light-shielding part 2 ... Transparent substrate 3 ... Photocatalyst containing layer 6 ... Ink 7 ... Press 8 ... Pixel part

Claims (1)

A color filter manufacturing method comprising:
Preparing a substrate on which a light shielding portion is formed;
Forming a plurality of ink-philic regions on the substrate so that there is an interval equal to or smaller than the line width of the light shielding portion on the light shielding portion;
Selectively attaching ink to the ink-philic region;
Applying pressure from above to the ink and flattening the ink while contacting the ink adhering to the adjacent ink-philic regions; and
A method for producing a color filter, comprising:

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