JP2010026107A - Cyan color pigment dispersion liquid for color filter and cyan color thermosetting resin composition for color filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cyan color pigment dispersion liquid for a color filter and a cyan color thermosetting resin composition for a color filter, both having high color density and excellent color reproducibility, brightness and contrast after cured. <P>SOLUTION: The cyan color pigment dispersion liquid for a color filter contains: a pigment containing at least C.I. Pigment Green 58 and a blue pigment; a pigment dispersant; and a solvent. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cyan pigment dispersion for color filters and a cyan thermosetting resin composition for color filters used for forming a colored layer such as a pixel.

In recent years, color liquid crystal display devices are rapidly spreading as flat displays for personal computers and the like. Generally, as shown in FIG. 1, the color liquid crystal display device (101) has a color filter 1 and an electrode substrate 2 such as a TFT substrate facing each other to provide a gap portion 3 of about 1 to 10 μm. The liquid crystal compound L is filled and the periphery thereof is sealed with a sealing material 4. The color filter 1 includes a black matrix layer 6 formed in a predetermined pattern on the transparent substrate 5 to shield the boundary between pixels, and a plurality of colors (usually red (R (R)) to form each pixel. ), Green (G), blue (B) three primary colors) arranged in a predetermined order, a protective film 8 and a transparent electrode film 9 are laminated in this order from the side close to the transparent substrate. Have taken. An alignment film 10 is provided on the inner surface side of the color filter 1 and the electrode substrate 2 facing the color filter 1. Furthermore, a spacer is provided in the gap portion 3 in order to maintain a constant and uniform cell gap between the color filter 1 and the electrode substrate 2. As the spacer, pearls 11 having a constant particle diameter are dispersed, or columnar spacers 12 having a height corresponding to the cell gap as shown in FIG. It is formed in a region overlapping with the formed position. A color image is obtained by controlling the light transmittance of each of the pixels colored in each color or the liquid crystal layer behind the color filter.

NTSC (National Television Standards Committee) is a typical transmission system for image signals in color television. NTSC is adopted as a standard for broadcasting television in Japan, the United States, Canada and the like.
The color reproduction range of a color television is determined by the chromaticity of the three primary colors (image receiving three primary colors) of the receiver. The NTSC standard image receiving three primary colors are as follows for the chromaticity coordinates x and y in the XYZ color system. It has been established.

Red: x = 0.67; y = 0.33
Green: x = 0.21; y = 0.71
Blue: x = 0.14; y = 0.08

  With the rapid spread of liquid crystal display devices, further improvements in display performance such as high color reproducibility, high brightness, and high contrast of color filters are required. In order to improve color reproducibility, it has been studied to add a pixel composed of at least one of yellow, magenta, and cyan to red (R), green (G), and blue (B) pixels in a color filter. Further, in order to improve color reproducibility, it is required that each color pixel portion has a sufficiently high color density.

Patent Document 1 discloses C.I. I. Pigment green 36, C.I. I. A radiation-sensitive composition for a cyan color filter containing a colorant composed of a mixture with CI Pigment Blue 15: 4 is disclosed.
Patent Document 2 discloses that pigments include C.I. I. Pigment green 7 and C.I. I. C.I. at least one selected from Pigment Green 36; I. Pigment blue 15: 3 and C.I. I. A cyan photocurable composition containing at least one selected from CI Pigment Blue 15: 6 is disclosed.
However, it is difficult to obtain sufficient color reproducibility, luminance, and contrast with a color filter having pixels formed using the cyan composition described in Patent Documents 1 and 2.

JP 11-72615 A JP 2006-98684 A

  In view of the above circumstances, the present invention provides a cyan pigment dispersion for a color filter having a high color density and excellent color reproducibility, luminance, and contrast after curing, and a cyan thermosetting resin composition for a color filter. It is intended to provide.

As a result of intensive studies, the present inventors have determined that C.I. I. By using Pigment Green 58, the inventors have found that the above problems can be solved, and have completed the present invention.
That is, the cyan pigment dispersion for a color filter according to the present invention has at least C.I. I. It contains a pigment containing Pigment Green 58 and a blue pigment, a pigment dispersant, and a solvent.

  According to the present invention, C.I. I. By using CI Pigment Green 58, it is possible to obtain a cyan pigment dispersion for a color filter having a high coloring density and excellent color reproducibility after curing, luminance, and contrast.

  In the cyan pigment dispersion for color filter according to the present invention, the C.I. I. The amount of pigment green 58 is C.I. I. The point that it is in the range of 30 to 90 parts by weight with respect to 100 parts by weight of the total of Pigment Green 58 and the blue pigment increases the color density and improves the color reproducibility, brightness, and contrast after curing. To preferred.

  In the cyan pigment dispersion for a color filter according to the present invention, the blue pigment is C.I. I. Pigment blue 15: 1, C.I. I. Pigment blue 15: 2, C.I. I. Pigment blue 15: 3, C.I. I. Pigment blue 15: 4, and C.I. I. It is preferable from the point of chromaticity adjustment, heat resistance, weather resistance, and chemical resistance to contain at least one selected from the group consisting of CI Pigment Blue 15: 6.

  The cyan pigment dispersion for color filter according to the present invention preferably contains a yellow pigment from the viewpoint of density and chromaticity adjustment.

  In the cyan pigment dispersion for a color filter according to the present invention, the blending amount of the yellow pigment is preferably in the range of 0 to 50% by weight with respect to the whole pigment from the viewpoint of maintaining the chromaticity region.

  In the cyan pigment dispersion for a color filter according to the present invention, the yellow pigment is at least C.I. I. Pigment yellow 138, and / or C.I. I. Pigment Yellow 150 is preferably included from the viewpoint of ensuring chromaticity adjustment, heat resistance, and weather resistance.

  A cyan thermosetting resin composition for a color filter according to the present invention comprises the cyan pigment dispersion for a color filter according to the present invention, a thermosetting resin, a thermal polymerization initiator, and a solvent. . According to the present invention, it is possible to form a pixel excellent in color reproducibility, luminance, and contrast by containing the cyan pigment dispersion for color filters.

  In the cyan thermosetting resin composition for a color filter according to the present invention, the maximum value of the transmission spectrum is preferably 485 to 515 nm from the viewpoint of increasing luminance.

  In the cyan thermosetting resin composition for color filters according to the present invention, the cyan thermosetting resin composition for color filters is formed into a uniform film having an average film thickness of 1.0 to 3.0 μm, When the film is measured with a C light source, it is preferable that the x coordinate is 0.110 ≦ x ≦ 0.130 and the y coordinate is 0.460 ≦ y ≦ 0.480 in the CIE XYZ color system. According to the cyan thermosetting resin composition for a color filter according to the present invention, at least C.I. I. By combining the pigment green 58 and the blue pigment, it is possible to increase the color density and form a pixel excellent in color reproducibility, luminance, and contrast.

According to the cyan pigment dispersion for a color filter according to the present invention, C.I. I. By using Pigment Green 58, the color density is high, and the color reproducibility, brightness, and contrast after curing can be improved.
In addition, according to the cyan thermosetting resin composition for a color filter according to the present invention, a pixel excellent in color reproducibility, luminance, and contrast can be formed.

  Hereinafter, the cyan pigment dispersion for color filter and the cyan thermosetting resin composition for color filter of the present invention will be described in order. In the present specification, the cyan pigment dispersion is prepared by mixing each pigment dispersion described later.

I. Cyan Pigment Dispersion for Color Filter The cyan pigment dispersion for a color filter according to the present invention includes at least C.I. I. It contains a pigment containing Pigment Green 58 and a blue pigment, a pigment dispersant, and a solvent.
According to the present invention, C.I. I. By using CI Pigment Green 58, it is possible to obtain a cyan pigment dispersion for a color filter having a high coloring density and excellent color reproducibility after curing, luminance, and contrast.

Hereinafter, components used in such a cyan pigment dispersion for a color filter of the present invention will be described.
<Pigment>
The pigment in the cyan pigment dispersion for color filters used in the present invention is at least C.I. represented by the following chemical formula (1). I. Pigment Green 58 and a blue pigment are included.

（上記化学式（１）中、Ｘ^１〜Ｘ^１６は、各々独立に、塩素原子、臭素原子、又は水素原子である。但し、Ｘ^１〜Ｘ^１６中、９〜１６個が臭素原子である。）

(In the above chemical formula ^{(1), X} 1 ~X ¹⁶ are each independently a chlorine atom, a bromine atom, or a hydrogen atom. ^However, in X 1 ^{to X 16,} 9 to 16 amino is a bromine atom. )

  Examples of the blue pigment include C.I. I. Pigment blue 15: 1, C.I. I. Pigment blue 15: 2, C.I. I. Pigment blue 15: 3, C.I. I. Pigment blue 15: 4, and C.I. I. It is preferable from the point of chromaticity adjustment, heat resistance, weather resistance, and chemical resistance to contain at least one selected from the group consisting of CI Pigment Blue 15: 6.

C. above. I. The pigment green 58 is preferably contained in an amount of 10 to 90% by weight, more preferably 50 to 75% by weight, based on the entire pigment. If the amount is less than 10% by weight, the high luminance effect may be reduced, and if it exceeds 90% by weight, chromaticity may be shifted.
The C.I. I. The amount of pigment green 58 is C.I. I. It is preferably in the range of 30 to 90 parts by weight, more preferably in the range of 30 to 60 parts by weight, with respect to 100 parts by weight in total of the pigment green 58 and the blue pigment. In the case of less than 30 parts by weight, C.I. I. The pigment green 58 may lose its high luminance effect, and if it exceeds 90 parts by weight, the chromaticity may be shifted.
Further, the above C.I. I. The blending amount of CI Pigment Green 58 is preferably 10 to 25% by weight with respect to the total amount of the cyan pigment dispersion for color filter including the solvent, from the viewpoint of pigment dispersibility. More preferably, it is 15 to 20% by weight.

  The pigment used in the present invention preferably contains a yellow pigment from the viewpoint of density and chromaticity adjustment. As the yellow pigment, at least C.I. I. Pigment yellow 138, and / or C.I. I. Pigment Yellow 150 is preferably included.

  The blending amount of the yellow pigment is preferably in the range of 0 to 50% by weight and more preferably in the range of 10 to 35% by weight with respect to the whole pigment. By setting it within the above range, a chromaticity region can be secured.

The pigment used in the present invention may include only the above-mentioned pigment, but other pigments may be used as appropriate.
As other pigments, any one of organic colorants and inorganic colorants can be selected and used. As the organic colorant, for example, dyes, organic pigments, natural pigments, and the like can be used. Moreover, as an inorganic coloring agent, an inorganic pigment, an extender pigment, etc. can be used, for example. Among these, organic pigments are preferably used because they have high color developability and high heat resistance. Examples of the organic pigment include compounds classified as pigments in the color index (C.I .; issued by The Society of Dyers and Colorists), specifically, the color index (C.I. ) Can be listed.

  C. I. Pigment green 36, C.I. I. Pigment green 7, C.I. I. Pigment red 177, C.I. I. Pigment red 254, C.I. I. Pigment red 242, and C.I. I. Pigment Violet 23.

  Specific examples of the inorganic pigment or extender pigment include titanium oxide, barium sulfate, calcium carbonate, zinc white, lead sulfate, yellow lead, zinc yellow, red rose (red iron (III) oxide), cadmium red, amber, etc. Can be mentioned. In the present invention, other pigments can be used alone or in admixture of two or more.

<Pigment dispersant>
The cyan pigment dispersion for color filters of the present invention is blended with a pigment dispersant in order to disperse the pigment satisfactorily. Examples of the pigment dispersant that can be used include cationic, anionic, nonionic, amphoteric, and silicone surfactants. Among the surfactants, polymer surfactants (polymer dispersants) as exemplified below are preferable. Further, a dispersion auxiliary resin such as a special acrylic polymer may be further used.
That is, polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, and polyoxyethylene oleyl ether; polyoxyethylene alkyl phenyl ethers such as polyoxyethylene octyl phenyl ether and polyoxyethylene nonyl phenyl ether Polymeric surfactants such as polyethylene glycol diesters such as polyethylene glycol dilaurate and polyethylene glycol distearate; sorbitan fatty acid esters; fatty acid-modified polyesters; tertiary amine-modified polyurethanes are preferably used.
The content of the pigment dispersant is preferably 30 to 80% by weight, more preferably 50 to 70% by weight, based on the whole pigment of the cyan pigment dispersion.

<Solvent>
The cyan pigment dispersion for color filters according to the present invention contains a solvent for dispersing the pigment.
Examples of the solvent used in the cyan pigment dispersion of the present invention include alcohol solvents such as methyl alcohol, ethyl alcohol, N-propyl alcohol and i-propyl alcohol; cellosolv solvents such as methoxy alcohol and ethoxy alcohol; Carbitol solvents such as ethanol and ethoxyethoxyethanol; ester solvents such as ethyl acetate, butyl acetate, methyl methoxypropionate, ethyl ethoxypropionate and ethyl lactate; ketone solvents such as acetone, methyl isobutyl ketone and cyclohexanone; methoxy Cellosolve acetate solvents such as ethyl acetate, methoxypropyl acetate, methoxybutyl acetate, ethoxyethyl acetate, ethyl cellosolve acetate; Carbitol acetate solvents such as ethyl acetate and ethoxyethoxyethyl acetate; ether solvents such as diethyl ether, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether and tetrahydrofuran; N, N-dimethylformamide, N, N-dimethylacetamide and N-methylpyrrolidone Aprotic amide solvents such as lactones; lactone solvents such as γ-butyrolactone; unsaturated hydrocarbon solvents such as benzene, toluene, xylene and naphthalene; saturated hydrocarbons such as N-heptane, N-hexane and N-octane Organic solvents, such as a solvent, are mentioned. Among these solvents, cellosolve acetate solvents such as methoxyethyl acetate, ethoxyethyl acetate, and ethyl cellosolve acetate; carbitol acetate solvents such as methoxyethoxyethyl acetate, ethoxyethoxyethyl acetate, and butyl carbitol acetate (BCA); Ether solvents such as ethylene glycol dimethyl ether, diethylene glycol dimethyl ether and propylene glycol diethyl ether; ester solvents such as methyl methoxypropionate, ethyl ethoxypropionate and ethyl lactate are preferably used. Among them, the solvent used in the present invention is selected from the group consisting of propylene glycol monomethyl ether acetate (CH ₃ OCH ₂ CH (CH ₃ ) OCOCH ₃ ), propylene glycol monomethyl ether, butyl carbitol acetate (BCA), and cyclohexanone. It is preferable that it is 1 or more types from the point of the solubility of another component, and the applicability | paintability.

These solvents may be used alone or in combination of two or more.
The cyan pigment dispersion according to the present invention is prepared by using the above solvent in a proportion of usually 60 to 85% by weight with respect to the total amount of the cyan pigment dispersion containing the solvent. When the amount of the solvent is too small, the viscosity increases and the pigment dispersibility tends to decrease. Moreover, when there are too many solvents, pigment concentration will fall and it may be difficult to achieve a target chromaticity coordinate after preparing a cyan thermosetting resin composition.

<Method for producing cyan pigment dispersion>
In the cyan pigment dispersion according to the present invention, each pigment dispersion is first prepared by mixing a pigment and a pigment dispersant in a solvent for each of the above-mentioned pigments and dispersing the mixture using a known disperser. . Next, the cyan pigment dispersion liquid can be prepared by mixing the pigment dispersion liquid and mixing them using a known stirrer. Examples of the dispersing machine for performing the dispersion treatment include roll mills such as two rolls and three rolls, ball mills such as a ball mill and a vibrating ball mill, bead mills such as a paint conditioner, a continuous disk type bead mill, and a continuous annular type bead mill. As a preferable dispersion condition of the bead mill, the bead diameter to be used is preferably 0.03 to 2.00 mm, and more preferably 0.10 to 1.0 mm.

When dispersing the pigment, it is preferable to add zirconia beads or the like as appropriate and perform dispersion for several hours using a paint shaker (manufactured by Asada Steel Corporation) or the like. Specifically, it can be dispersed for 1 hour with 2 mm zirconia beads having a relatively large bead diameter and further for 2 hours with 0.1 mm zirconia beads having a relatively small bead diameter. Moreover, it is preferable to filter with a 5.0 micron membrane filter after dispersion.
In this way, a cyan pigment dispersion having excellent pigment particle dispersibility is obtained. This cyan pigment dispersion is used as a preliminary preparation for preparing a cyan thermosetting resin composition for color filters having excellent pigment dispersibility.

II. Cyan color thermosetting resin composition for color filter Cyan color thermosetting resin composition for color filter according to the present invention is a cyan color pigment dispersion for color filter, thermosetting resin, thermal polymerization initiator according to the present invention. And a solvent. According to the present invention, a pixel having excellent color reproducibility, brightness, and contrast can be formed by using the resin composition containing the cyan pigment dispersion for color filters.
In the present invention, as a method for forming the pixel portion, a known method such as a printing method, a pigment dispersion method, an ink jet method, or the like can be used. Among them, an ink jet method excellent in productivity is preferably used. be able to.
Hereinafter, components used in such a cyan thermosetting resin composition for color filters of the present invention will be described. In addition, about a solvent, since the thing similar to what was demonstrated in the location of the said cyan pigment dispersion liquid for color filters can be used, description here is abbreviate | omitted.

<Thermosetting resin>
As the thermosetting resin of the present invention, a compound having two or more thermosetting functional groups in one molecule is used. An epoxy group is preferable as the thermosetting functional group. Moreover, you may use further the polymer which has no polymerization reactivity in itself.

  As a compound having two or more thermosetting functional groups in one molecule, an epoxy compound having two or more epoxy groups in one molecule is usually used. An epoxy compound having two or more epoxy groups in one molecule is an epoxy compound having two or more, preferably 2 to 50, more preferably 2 to 20 epoxy groups in one molecule (referred to as an epoxy resin). Is included). The epoxy group should just be a structure which has an oxirane ring structure, for example, can show a glycidyl group, an oxyethylene group, an epoxycyclohexyl group, etc. Examples of the epoxy compound include known polyvalent epoxy compounds that can be cured by carboxylic acid. Examples of such an epoxy compound include “Epoxy resin handbook” edited by Masaki Shinbo, published by Nikkan Kogyo Shimbun (Showa 62). These can be used widely.

  As an epoxy compound, a polymer having a relatively high molecular weight is used in combination with a compound having a relatively low molecular weight in order to increase the crosslinking density of the cured film in order to impart solvent resistance and heat resistance to the cured film. It is preferable. Specifically, as the thermosetting resin, resins described in paragraph numbers 0132 to 0160 of JP-A-2006-106503 can be used.

The content of the thermosetting resin is based on the total solid content of the cyan thermosetting resin composition.
It is preferably in the range of 5.00 to 25.0% by weight, and more preferably in the range of 6.50 to 22.0% by weight. This is because if the amount is less than the above range, sufficient thermosetting may not be obtained. Moreover, it is because a curing defect will be produced when it exceeds the said range.
In addition, "solid content" shows components other than the solvent in a composition.

<Thermal polymerization initiator>
The thermal polymerization initiator used in the present invention is not particularly limited, but an acid anhydride is preferable from the viewpoint of a long pot life and a small calorific value. Examples of the acid anhydride include polyvalent carboxylic acid anhydrides, and specifically include phthalic anhydride, itaconic anhydride, succinic anhydride, citraconic anhydride, dodecenyl succinic anhydride, tricarballylic anhydride, maleic anhydride. Aliphatic polycarboxylic dianhydrides such as acids, hexahydrophthalic anhydride, dimethyltetrahydrophthalic anhydride, hymic anhydride, nadic anhydride, and other aliphatic or alicyclic dicarboxylic dianhydrides; pyromellitic anhydride , Aromatic polycarboxylic acid anhydrides such as trimellitic anhydride and benzophenone tetracarboxylic anhydride; and ester group-containing acid anhydrides such as ethylene glycol bistrimellilate and glyceryl tristrimellate An epoxy resin curing agent made of carboxylic acid anhydride can also be suitably used. .

  Said thermal polymerization initiator can be used individually by 1 type or in mixture of 2 or more types. The blending amount of the thermal polymerization initiator used in the present invention is usually in the range of 1 to 100 parts by weight, preferably 5 to 50 parts by weight per 100 parts by weight of the thermosetting resin. If the blending amount of the thermal polymerization initiator is less than 1 part by weight, curing may be insufficient and a tough coating film may not be formed. Moreover, when the compounding quantity of a thermal-polymerization initiator exceeds 100 weight part, there exists a possibility that the adhesiveness with respect to the board | substrate of a coating film may be inferior.

<Other ingredients>
Furthermore, the cyan thermosetting resin composition for color filters of the present invention may contain one or more other additives as required. The following can be illustrated as such an additive.
a) Filler: For example, glass, alumina and the like.
b) Adhesion promoter: for example, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane.
c) Leveling agents: For example, vinyl polymers such as polyoxyalkylene surfactants, fatty acid ester surfactants, special acrylic polymers, vinyl ether polymers, and the like.
d) Anti-aggregation agent: for example, sodium polyacrylate.

<Method for producing thermosetting resin composition>
The cyan thermosetting resin composition for a color filter of the present invention is a single solvent or a mixed solvent together with other compounding components, if necessary, with a pigment, a pigment dispersant, a thermosetting resin, and a thermal polymerization initiator. It can be produced by mixing in a solvent and dissolving or dispersing the solid component by a known dispersion method.
However, in the above method, a large amount of pigment may not be sufficiently dispersed in the solvent. Therefore, it is preferable to prepare in advance the pigment dispersion according to the present invention, while preparing a resin composition liquid in which other components such as a thermosetting resin are mixed, dispersed or dissolved with a solvent. Then, by mixing the obtained pigment dispersion and the resin composition liquid, and performing a dispersion treatment as necessary, a cyan thermosetting resin for a color filter having excellent pigment dispersibility and pigment dispersion stability over time. A composition is easily obtained.

  If the pigment dispersion is not prepared in advance, first add the pigment and the pigment dispersant to the solvent, mix well, stir to disperse the pigment, and then add the remaining components including the thermosetting resin. In this case, the dispersibility is not hindered by other compounding components in the pigment dispersion step, and the stability is also excellent.

Further, the solid content concentration with respect to the total weight of the cyan thermosetting resin composition for color filters is 15 to 25% by weight, preferably 18 to 22% by weight. If the solid content concentration is too low, it is necessary to increase the amount of liquid applied in the pixel, which causes problems such as breakage during patterning. On the other hand, if the solid content concentration is too high, problems such as clogging of ink jet head nozzles and ejection problems occur.
Here, the solid content concentration is the weight% of the net weight of components other than the solvent in the composition with respect to the total weight of the composition.

  In the cyan thermosetting resin composition for color filters of the present invention, the P / V ratio is preferably adjusted in the range of 0.5 to 1.2. Here, the P / V ratio is the weight ratio of the pigment content (P: pigment) to the solid content (V: vehicle) other than the pigment in the cyan thermosetting resin composition.

<Film physical properties>
The cyan thermosetting resin composition for color filters according to the present invention has at least C.I. I. By using a pigment containing Pigment Green 58 and a blue pigment, it is possible to realize a film having a high color density and high color reproducibility, brightness, and contrast. The film here refers to a film after drying the cyan thermosetting resin composition.
Specifically, when the cyan thermosetting resin composition of the present invention is formed into a uniform film having an average film thickness of 1.0 to 3.0 μm, and the film is measured with a C light source, CIE XYZ In the color system, the x coordinate can be 0.110 ≦ x ≦ 0.130 and the y coordinate can be 0.460 ≦ y ≦ 0.480, and a desired cyan color can be obtained.
Here, the uniform film means a film having a film thickness difference of less than 0.1 μm. Moreover, the said uniform film | membrane can be produced as follows, for example. First, a cyan thermosetting resin composition is applied on a glass substrate by spin coating. Thereafter, the film is dried, pre-baked as necessary, and then cured by appropriate exposure and / or heating to form a uniform film. The film thickness after drying and curing can be measured with a film thickness measuring device (manufactured by KLA-Tencor, product name: TENCOR P-II).

The maximum value of the transmission spectrum of the cyan thermosetting resin composition for color filters according to the present invention is preferably 485 to 515 nm, and more preferably 490 to 505 nm. By setting it within the above range, a cyan thermosetting resin composition having high color purity can be obtained.
The transmission spectrum of the cyan thermosetting resin composition can be measured with a microscope spectrophotometer (manufactured by Olympus Corporation, product name OSP-SP200).

  Hereinafter, the present invention will be described more specifically with reference to examples. These descriptions do not limit the present invention.

Example 1
(1) Preparation of pigment dispersion A pigment, a pigment dispersant, and a solvent are mixed in the following ratio, 100 parts by weight of zirconia beads having a diameter of 1.0 mm are added, and 3 hours using a paint shaker (manufactured by Asada Tekko) Dispersion was performed to prepare a green pigment dispersion, a blue pigment dispersion, and a yellow pigment dispersion, respectively.
[Composition of green pigment dispersion]
・ C. I. Pigment Green 58 (FASTOGEN GREEN A110: trade name, manufactured by Dic Co., Ltd.): 15.0 parts by weight / pigment dispersant (Ajisper PB821: trade name, manufactured by Ajinomoto Fine Techno Co., Ltd.): 10.5 parts by weight / butyl Diglycol acetate: 74.5 parts by weight [composition of blue pigment dispersion]
・ C. I. Pigment Blue 15: 6 (LIONOL BLUE ES: trade name, manufactured by Toyo Ink Manufacturing Co., Ltd.): 15.0 parts by weight / pigment dispersant (Azisper PB821: trade name, manufactured by Ajinomoto Fine Techno Co., Ltd.): 10.5 Part by weight / Butyl diglycol acetate: 74.5 parts by weight [Composition of yellow pigment dispersion]
・ C. I. Pigment Yellow 150 (E4GN-GT: trade name, manufactured by LANXESS): 15.0 parts by weight / pigment dispersant (Ajisper PB821: trade name, manufactured by Ajinomoto Fine Techno Co.): 10.5 parts by weight / butyl diglycol acetate : 74.5 parts by weight

(2) Preparation of Cyan Color Thermosetting Resin Composition for Color Filter Next, an epoxy resin having two or more epoxy groups in one molecule as a thermosetting resin (EHPE3150: trade name, Daicel Chemical Industries, Ltd.) 143 parts by weight, and 5.2 parts by weight of a thermal polymerization initiator (acid anhydride, Ricacid MTA-15: trade name, manufactured by Shin Nippon Rika Co., Ltd.), and 148.2 parts by weight of diethylene glycol monobutyl ether acetate. To 8.89 parts by weight of the resin composition having a solid content of 50% by weight, 36.62 parts by weight of the green pigment dispersion of (1), 17.54 parts by weight of the blue pigment dispersion of (1), And 7.38 parts by weight of the yellow pigment dispersion of (1) above were mixed, so that the blending weight ratio (P / V) between the pigment (P) and the solid content (V) other than the pigment was 1.00. . Further, 29.57 parts by weight of butyl diglycol acetate was added as a diluent solvent so that the solid content in the mixed solution was 20% by mass, thereby preparing a cyan thermosetting resin composition for a color filter.

(Comparative Example 1)
(1) Preparation of pigment dispersion A pigment, a pigment dispersant, and a solvent are mixed in the following ratio, 100 parts by weight of zirconia beads having a diameter of 1.0 mm are added, and 3 hours using a paint shaker (manufactured by Asada Tekko) Dispersion was performed to prepare a green pigment dispersion, a blue pigment dispersion, and a yellow pigment dispersion, respectively.
[Composition of green pigment dispersion]
・ C. I. Pigment Green 36 (LIONOL GREEN 2YS: trade name, manufactured by Toyo Ink Manufacturing Co., Ltd.): 15.0 parts by weight / pigment dispersant (Ajisper PB821: trade name, manufactured by Ajinomoto Fine Techno Co., Ltd.): 10.5 parts by weight Butyl diglycol acetate: 74.5 parts by weight [composition of blue pigment dispersion]
・ C. I. Pigment Blue 15: 6 (LIONOL BLUE ES: trade name, manufactured by Toyo Ink Manufacturing Co., Ltd.): 15.0 parts by weight / pigment dispersant (Azisper PB821: trade name, manufactured by Ajinomoto Fine Techno Co., Ltd.): 10.0 Part by weight / Butyl diglycol acetate: 75.0 parts by weight [Composition of yellow pigment dispersion]
・ C. I. Pigment Yellow 150 (E4GN-GT: trade name, manufactured by LANXESS): 15.0 parts by weight / pigment dispersant (Ajisper PB821: trade name, manufactured by Ajinomoto Fine Techno Co., Ltd.): 10.0 parts by weight / butyl diglycol acetate : 75.0 parts by weight

(2) Preparation of Cyan Color Thermosetting Resin Composition for Color Filter Next, an epoxy resin having two or more epoxy groups in one molecule as a thermosetting resin (EHPE3150: trade name, Daicel Chemical Industries, Ltd.) 143 parts by weight, and 5.2 parts by weight of a thermal polymerization initiator (acid anhydride, Ricacid MTA-15: trade name, manufactured by Shin Nippon Rika Co., Ltd.), and 148.2 parts by weight of diethylene glycol monobutyl ether acetate. To 8.89 parts by weight of a resin composition having a solid content of 50% by weight, 33.80 parts by weight of the green pigment dispersion of (1), 19.45 parts by weight of the blue pigment dispersion of (1), And 8.20 parts by weight of the yellow pigment dispersion of (1) above were mixed, so that the blending weight ratio (P / V) between the pigment (P) and the solid content (V) other than the pigment was 1.00. . Further, 29.57 parts by weight of butyl diglycol acetate was added as a diluent solvent so that the solid content in the mixed solution was 20% by mass, thereby preparing a cyan thermosetting resin composition for a color filter.

About each obtained cyan color thermosetting resin composition for color filters, the resin cured film was formed as follows, and brightness | luminance and contrast were evaluated. The evaluation results are also shown in Table 1.
[Evaluation]
(1) Formation of coating film Each of the cyan thermosetting resin compositions was applied onto a 0.7 mm thick glass substrate (Corning, 1737 glass plate) by spin coating.
Thereafter, prebaking was performed on a hot plate at 90 ° C. for 10 minutes. Thereafter, the film was heated at 200 ° C. for 30 minutes in a clean oven for post baking, and further heated at 240 ° C. for 30 minutes to perform post baking to form a color filter layer. The film thickness after drying and curing is shown in Table 1. The film thickness was measured with a film thickness measuring device (manufactured by KLA-Tencor, product name: TENCOR P-II).
(2) Chromaticity coordinates (x, y, luminance Y)
About the obtained color filter layer, chromaticity x = 0.118, chromaticity y = 0.470, and P / V = 1.0 using the microscope spectrophotometer (the Olympus Corporation make, OSP-SP200). The brightness Y was measured.
(3) for contrast measurement obtained color filter layer, the contrast measuring device DOJUN KOKIMFG (source: _{F 8} (color rendering AAA daylight white), luminance meter: Konica Minolta, trade name: LS100) using a measurement of brightness went. The contrast can be derived from the following formula using the measured luminance value.
Contrast = parallel luminance (cd / m ² ) / orthogonal luminance (cd / m ² )

(Summary of results)
From Table 1, C.I. I. In Example 1 using Pigment Green 58, C.I. I. Compared with the comparative example 1 which uses the pigment green 36, a brightness | luminance and contrast are high. Moreover, in Example 1, since the film thickness of the color filter layer can be reduced while the blending weight ratio (P / V) of the pigment (P) and the solid content (V) other than the pigment is the same, as the green pigment, , C.I. I. It was found that the color density can be increased by using Pigment Green 58.

It is typical sectional drawing about an example of a liquid crystal panel. It is typical sectional drawing about another example of a liquid crystal panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Color filter 2 Electrode substrate 3 Gap part 4 Sealing material 5 Transparent substrate 6 Black matrix layer 7 (7R, 7G, 7B) Pixel 8 Protective film 9 Transparent electrode film 10 Orientation film 11 Pearl 12 Columnar spacer

Claims (9)

Containing a yellow pigment at least C.I. I. A cyan pigment dispersion for a color filter, comprising a pigment containing Pigment Green 58 and a blue pigment, a pigment dispersant, and a solvent.   C. above. I. The amount of pigment green 58 is C.I. I. 2. The cyan pigment dispersion for color filters according to claim 1, wherein the dispersion is in the range of 30 to 90 parts by weight with respect to 100 parts by weight in total of Pigment Green 58 and the blue pigment.   The blue pigment is C.I. I. Pigment blue 15: 1, C.I. I. Pigment blue 15: 2, C.I. I. Pigment blue 15: 3, C.I. I. Pigment blue 15: 4, and C.I. I. The cyan pigment dispersion for a color filter according to claim 1 or 2, comprising at least one selected from the group consisting of CI Pigment Blue 15: 6.   The cyan pigment dispersion for color filters according to claim 1, comprising a yellow pigment.   The cyan pigment dispersion for a color filter according to claim 4, wherein the blending amount of the yellow pigment is in the range of 0 to 50 wt% with respect to the whole pigment.   The yellow pigment is at least C.I. I. Pigment yellow 138, and / or C.I. I. The cyan pigment dispersion for a color filter according to claim 4 or 5, comprising CI Pigment Yellow 150.   Cyan color thermosetting for color filters, comprising the cyan pigment dispersion for color filters according to any one of claims 1 to 6, a thermosetting resin, a thermal polymerization initiator, and a solvent. Resin composition.   The cyan thermosetting resin composition for a color filter according to claim 7, wherein the maximum value of the transmission spectrum is 485 to 515 nm.   When the cyan thermosetting resin composition for color filters is formed into a uniform film having an average film thickness of 1.0 to 3.0 μm, and the film is measured with a C light source, the CIE XYZ color system is used. 9. The cyan thermosetting resin composition for a color filter according to claim 7, wherein the x coordinate is 0.110 ≦ x ≦ 0.130 and the y coordinate is 0.460 ≦ y ≦ 0.480. object.

Images