JP2018025797A - Coloring material liquid for color filter, colored composition for color filter, color filter and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coloring material liquid for a color filter, which achieves reduction in film thickness of a color filter, induces little parallax color mixing and shows excellent color reproducibility of pixels and the like, to provide a colored composition for a color filter using a coloring material dispersion that can disperse a coloring material in a good state upon producing a colored layer and is less likely to deteriorate with time, and to provide a colored composition for a color filter, which is less likely to cause unevenness by drying and has excellent re-dissolving property.SOLUTION: The coloring material liquid for a color filter comprises a coloring material and a solvent. The total mass of calcium (Ca) and iron (Fe) contained in the coloring material liquid for a color filter is 180 ppm by mass or less with respect to the whole coloring material liquid for a color filter. The coloring material liquid contains two or more solvents. A colored composition for a color filter and a color filter are also provided using the above coloring material liquid for a color filter.SELECTED DRAWING: None

Description

The present invention relates to a color material liquid for color filters and a color composition for color filters, and more specifically, a color material for color filters in which the total content of specific metal elements is defined and contains two or more solvents. The present invention relates to a liquid, a color composition for color filters, and a color filter obtained by using them.
In addition, when manufacturing the coloring composition for color filters, the color material liquid which disperse | distributed or dissolved the color material in the solvent beforehand may be used. In this specification, “coloring material dispersion liquid” in which particles of coloring materials such as pigments and dyes are dispersed in a solvent, and “coloring material in which coloring materials such as dyes are dissolved in the solvent” The term “solution” is collectively referred to as “coloring material liquid”.

  A color filter used for a display or the like generally has a transparent substrate, a colored layer, a light-shielding portion, and the like. As a method for forming the colored layer, a pigment dispersion method, a dyeing method, an electrodeposition method, a printing method, and the like. Among them, the pigment dispersion method is widely used in terms of spectral characteristics, durability, pattern shape, accuracy, etc. (Patent Documents 1 and 2).

  In recent years, with the development of displays, the demand for liquid crystal displays, organic EL displays, etc. has increased, and accordingly, the performance of these displays has been improved with improved color rendering, contrast, brightness, color reproducibility, etc. Is strongly desired.

In recent years, the black matrix has become thinner for higher definition in tablets, smartphones, etc., and the phenomenon of parallax color mixing, where the colors of adjacent pixels appear to be mixed when the display is viewed from the side, has become a particular problem. ing.
In order to solve this problem, it is required to reduce the thickness of the color filter. Specifically, for example, it is required to achieve a film thickness of about 50% to 70% of the conventional film thickness.
On the other hand, high color rendering in a chromaticity range defined as “adobe RGB standard” and “DCI standard” (“DCI” is Digital Cinema Initiatives) is also required for the reproduced colors of pixels.

  Therefore, in order to reduce the thickness of the color filter and increase the color rendering of the pixels, it is necessary to increase the color material concentration of the coloring composition for the color filter.

However, if it is attempted to increase the color material concentration of the color filter coloring composition or the color material liquid used therefor, it becomes difficult to disperse and dissolve the color material in the first place, and stability over time cannot be obtained. There was a case.
Furthermore, as the colorant density increases, the components necessary for patterning for forming pixels are relatively reduced, and good developability cannot be obtained (development speed is small; development residue is large; etc.). was there.

  That is, even if a coloring composition for a color filter that can be dispersed / dissolved at a high concentration and has excellent color performance can be compared, there has been a problem that it is difficult to achieve both developability and color filter production.

  On the other hand, Patent Documents 3 to 6 are known for prescribing the content of a metal element in a color filter or a colored composition for producing a color filter.

Patent Document 3 defines the total amount of sodium ions (Na ⁺ ) and potassium ions (K ⁺ ) contained in R (red), G (green), B (blue), and BK (black) pixels. Thus, a technique for preventing contamination of a liquid crystal element or a semiconductor element adjacent to the color filter is disclosed.
Patent Document 4 discloses a technique for achieving a high light shielding rate and a low surface reflectance by defining the total amount of sodium (Na) and potassium (K) in a resin coated with carbon black for a black matrix. Has been.

Patent Document 5 describes a pigment dispersion that regulates the electrical conductivity and regulates the contents of sodium (Na), potassium (K), and magnesium (Mg). The color filter obtained in this way is said to have good display stability because of its excellent voltage holding ratio.
In Patent Document 6, C.I. I. An organic pigment composition for a color filter in which the content of sodium ion (Na ⁺ ), potassium ion (K ⁺ ), and magnesium ion (Mg ⁺ ) contained in Pigment Green 58 is specified is described. The color filter obtained in this way is said to be excellent in display response.

However, since the color material liquid for display color filters is required to have a very high level of dispersion and dissolution, the above-described technology is not sufficient, and further improvement is desired to solve the above-described problems. It was rare.
In particular, parallax color mixing has become a problem due to high definition, and high color rendering of pixels has been demanded, and a reduction in film thickness of color filters has been demanded in recent years. There has been a demand for a coloring composition for a color filter having excellent performance in properties, various image characteristics, developability when producing a color filter, and the like.

JP 2007-133131 A JP 2009-244617 A JP-A-7-198928 Japanese Patent Laid-Open No. 9-071733 JP 2009-007432 A JP 2014-119487 A

The present invention has been made in view of the above-described background art, and the problem is that the color filter has been reduced in thickness, and there is little parallax mixing when the display is viewed from the side. An object of the present invention is to provide a color material liquid for color filters having excellent properties such as achieving high color rendering in a constant chromaticity range and a color composition for color filters using the same.
In addition, the color material of the color filter coloring composition can be dispersed and dissolved well, and the color material solution for color filter having excellent viscosity stability and the developability (high development speed, amount of development residue) It is to provide a coloring composition for a color filter.

  As a result of intensive studies to achieve the above-mentioned object, the present inventor is very common such as sodium (Na) and potassium (K) contained in the color filter liquid material or the color filter coloring composition. Metal elements other than metal elements such as “calcium (Ca), iron (Fe)” (hereinafter, the parentheses may be referred to as “first specific metal element”), “magnesium (Mg), aluminum (Al), chromium (Cr) ”(hereinafter, the parentheses may be referred to as“ second specific metal element ”. In addition,“ first specific metal element ”and“ second specific metal element ”are collectively referred to. The color material liquid for color filters, the color composition for color filters, and the color filter, which are surprisingly solved by reducing the content of “specific metal element”) It was found to be obtained.

In addition, the present inventor uses “specific metal elements” (“first specific metal element” and “second specific metal” mixed in from the solvent, process water, equipment members, etc. used in the process of producing the color material. Element ”) (especially when there is a“ first specific metal element ”), the initial viscosity of the color material liquid during the production of the color material liquid is increased, the temporal stability is deteriorated, and the development time is increased. It was found that an appropriate pattern and good pixels cannot be obtained.
Then, by reducing the mixing of “specific metal elements” in the color material, solvent, etc., which are the raw materials of the color filter liquid for color filters (especially, reducing the mixing of “specific metal elements” in the color material) Thus, it has been found that a colored composition for a color filter and a color filter in which the above problems are solved can be obtained.

Further, the present inventor has found that when the coloring composition contains a large amount of the specific metal element, not only the development time becomes longer, but also the problem that the drying unevenness of the coating film easily occurs. In the case of the coloring composition using the color material dispersion, this is considered to be caused by uneven distribution of the color material that is precipitated due to the dispersion state being broken during drying. Further, when a color material solution using a dye as a color material is used, it is considered that if the amount of the specific metal element is too large, the solubility of the color material is reduced, aggregates are easily generated, and drying unevenness occurs. .
The present inventor has found that the occurrence of drying unevenness can be suppressed by using two or more solvents when preparing the colored composition after reducing the mixing of the specific metal element. Thus, the present invention has been completed.

In addition, when the re-dissolution property of the coloring composition is not sufficient, for example, when the coloring composition attached to the tip of the die lip is solidified by drying when applying with a die coater, a problem such as causing a foreign matter defect occurs. There is.
The present inventor has found that the re-solubility of the colored composition is improved by using two or more solvents when preparing the colored composition, and has completed the present invention.

  That is, the present invention is a color material liquid for color filters containing a color material and a solvent, and the total mass of calcium (Ca) and iron (Fe) contained in the color material liquid for color filters is the color filter. The present invention provides a color material liquid for color filters, which is 180 mass ppm or less based on the total color material liquid and contains two or more solvents.

  Further, the present invention is a coloring composition containing a coloring material, a polymerization initiator and an alkali-soluble resin, wherein the total mass of calcium (Ca) and iron (Fe) contained in the coloring composition is the coloring composition. The present invention provides a coloring composition for a color filter, which is 120 ppm by mass or less based on the whole product and contains two or more solvents.

  The present invention also provides a color filter having a colored layer that is a cured product of the color filter coloring composition containing the color filter liquid material.

  In addition, the present invention provides a display device having the above color filter.

As described above, the contamination of liquid crystal elements and semiconductor elements adjacent to the color filter is prevented by avoiding mixing of extremely common metal elements such as sodium (Na) and potassium (K), and the inclusion of the metal in the pigment coating resin A technology that achieves high light-shielding rate and low surface reflectance by specifying the amount, or increases the voltage holding ratio by specifying the metal content in the color filter to improve display stability and display response. Are known.
That is, a technique for reducing specific metal elements and improving specific optical characteristics and electrical characteristics directly attributable to the mixing of the metal is known.

  However, the content of specific metal elements (especially the first specific metal element) is specified, and the aspect (high concentration, etc.) and physical properties (low viscosity, dispersion stability, etc.) are determined at the colorant liquid stage. There is no known technique for improving and finally obtaining an excellent color filter using the same.

  That is, by defining the content of “calcium (Ca), iron (Fe)” (first specific metal element), “magnesium (Mg), aluminum (Al), chromium (Cr)” (first) By defining the content of the two (specific metal elements), it is possible to obtain a colorant solution with low viscosity (appropriate viscosity) and excellent dispersion stability and solubility even at high colorant concentrations. It is not known that a color filter having excellent development characteristics can be obtained.

  According to the present invention, it is possible to provide a color material liquid for a color filter that can be dispersed and dissolved satisfactorily and hardly deteriorates with time.

  In addition, when the color material liquid for color filter in the present invention is used, a color composition for color filter that can obtain good dispersion performance, dispersion stability performance, and solubility and also has good development characteristics at the time of producing the color filter. Can be provided.

  Particularly in recent years, in order to solve the above-mentioned problems, it is required to reduce the film thickness of the color filter. On the other hand, high color rendering in a certain chromaticity range is also demanded for the reproduced color of the pixel. When a color filter coloring composition is used, the color filter can be reduced in thickness, has little parallax color mixing, achieves high color rendering, and provides a color filter coloring composition and color filter excellent in developability in patterning. can do.

  Hereinafter, the present invention will be described, but the present invention is not limited to the following specific embodiments, and can be arbitrarily modified within the scope of the technical idea.

The “color filter liquid for color filter” in the present invention contains at least a color material and a solvent, and the total mass of calcium (Ca) and iron (Fe) contained in the color filter liquid for color filter is It is 180 mass ppm or less with respect to the whole color material liquid for color filters.
Furthermore, the “coloring composition for color filter” of the present invention is a coloring composition containing a coloring material, a polymerization initiator and an alkali-soluble resin, and contains calcium (Ca) and iron ( The total mass of Fe) is 120 mass ppm or less with respect to the whole coloring composition. By using the color material liquid for color filter, it is easy to prepare a colored composition for color filter in which the total mass of calcium (Ca) and iron (Fe) is within this range.
In the present invention, “color material liquid for color filter” may be simply abbreviated as “color material liquid”, and “color composition for color filter” may be simply abbreviated as “color composition”. is there.

<Color material>
In the present invention, the color material is not particularly limited as long as it can form a desired color when a colored layer of a color filter is formed, and includes various inorganic pigments, organic pigments, dyes, and the like. May be used singly or in combination of two or more.
Among these, organic pigments are preferably used because they have high color developability and high heat resistance.

<< Inorganic pigment >>
Specific examples of the inorganic pigment used in the present invention include titanium oxide, barium sulfate, calcium carbonate, zinc white, lead sulfate, yellow lead, zinc yellow, red rose (red iron oxide (III)), cadmium red, ultramarine blue, and bitumen. Chrome oxide green, cobalt green, amber, titanium black, synthetic iron black, carbon black and the like.

<< Organic pigment >>
The organic pigment used in the present invention is a color pigment (including achromatic pigments such as black) and is not particularly limited as long as it can produce a desired color as an organic pigment for a color filter. Here, “for color filter” includes all colors for coloring a color filter, such as for a pixel portion and a black matrix portion.

  In addition, as the organic pigment used in the present invention, a lake pigment that can be dispersed by bonding various substituents to a dye or insolubilizing in a solvent by using a known lake (chlorination) technique. Also mentioned.

Here, organic pigments include achromatic pigments such as white, black, and gray. Specifically, blue pigments, green pigments, red pigments, yellow pigments, purple pigments, orange pigments, brown pigments, black pigments. Various color pigments such as pigments can be used.
Since the pigment dispersion in the present invention is used as a color filter material, it is mainly a blue pigment, a green pigment, a red pigment, or a black pigment. However, in order to adjust the transmission / absorption wavelength thereof, the pigment of the above color tone Is also used.
Among the above, a blue pigment, a green pigment, a red pigment, a yellow pigment, a purple pigment, and the like are preferable from the viewpoint of exhibiting the effect of the present invention.

  Below, the specific example of an organic pigment is shown with a pigment number. The following “CI” means a color index.

Examples of red pigments include C.I. I. Pigment Red 1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 14, 15, 16, 17, 21, 22, 23, 31, 32, 37, 38, 41, 47, 48, 48: 1, 48: 2, 48: 3, 48: 4, 49, 49: 1, 49: 2, 50: 1, 52: 1, 52: 2, 53, 53: 1, 53: 2, 53: 3, 57, 57: 1, 57: 2, 58: 4, 60, 63, 63: 1, 63: 2, 64, 64: 1, 68, 69, 81, 81: 1, 81: 2, 81: 3, 81: 4, 83, 88, 90: 1, 101, 101: 1, 104, 108, 108: 1, 109, 112, 113, 114, 122, 123, 144, 146, 147, 149, 151, 166, 168, 169, 170, 172, 173, 174, 175, 176, 177, 178, 17 , 181, 184, 185, 187, 188, 190, 193, 194, 200, 202, 206, 207, 208, 209, 210, 214, 216, 220, 221, 224, 230, 231, 232, 233, 235 236, 237, 238, 239, 242, 243, 245, 247, 249, 250, 251, 253, 254, 255, 256, 257, 258, 259, 260, 262, 263, 264, 265, 266, 267 268, 269, 270, 271, 272, 273, 274, 275, 276 and the like.
Of these, C.I. I. Pigment Red 48: 1, 122, 168, 177, 202, 206, 207, 209, 224, 242, 254 and the like. I. Pigment red 177, 209, 224, 254 and the like.

Examples of blue pigments include C.I. I. Pigment Blue 1, 1: 2, 9, 14, 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 17, 19, 25, 27, 28, 29, 33, 35, 36, 56, 56: 1, 60, 61, 61: 1, 62, 63, 66, 67, 68, 71, 72, 73, 74, 75, 76, 78, 79 and the like.
Of these, C.I. I. Pigment blue 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, and the like. I. Pigment blue 15: 6.

Examples of green pigments include C.I. I. Pigment green 1, 2, 4, 7, 8, 10, 13, 14, 15, 17, 18, 19, 26, 36, 45, 48, 50, 51, 54, 55, 58, 59, and the like.
Of these, C.I. I. Pigment green 7, 36, 58, 59, and the like.

Examples of yellow pigments include C.I. I. Pigment Yellow 1, 1: 1, 2, 3, 4, 5, 6, 9, 10, 12, 13, 14, 16, 17, 24, 31, 32, 34, 35, 35: 1, 36, 36: 1, 37, 37: 1, 40, 41, 42, 43, 48, 53, 55, 61, 62, 62: 1, 63, 65, 73, 74, 75, 81, 83, 87, 93, 94, 95, 97, 100, 101, 104, 105, 108, 109, 110, 111, 116, 117, 119, 120, 126, 127, 127: 1, 128, 129, 133, 134, 136, 138, 139, 142, 147, 148, 150, 151, 153, 154, 155, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 172, 17 174, 175, 176, 180, 181, 182, 183, 184, 185, 188, 189, 190, 191, 191: 1, 192, 193, 194, 195, 196, 197, 198, 199, 200, 202 , 203, 204, 205, 206, 207, 208, 213 and the like.
Of these, C.I. I. Pigment yellow 83, 117, 129, 138, 139, 150, 154, 155, 180, 185, 213, and the like. I. Pigment yellow 83, 138, 139, 150, 180, 185 and the like.

Examples of orange pigments include C.I. I. Pigment Orange 1, 2, 5, 13, 16, 17, 19, 20, 21, 22, 23, 24, 34, 36, 38, 39, 43, 46, 48, 49, 61, 62, 64, 65, 67, 68, 69, 70, 71, 72, 73, 74, 75, 77, 78, 79 and the like.
Of these, C.I. I. Pigment oranges 38 and 71, and the like.

Examples of purple pigments include C.I. I. Pigment Violet 1, 1: 1, 2, 2: 2, 3, 3: 1, 3: 3, 5, 5: 1, 14, 15, 16, 19, 23, 25, 27, 29, 31, 32, 37, 39, 42, 44, 47, 49, 50 and the like.
Of these, C.I. I. Pigment violet 19, 23, and the like. I. And CI Pigment Violet 23.

In the present invention, one kind of the above pigment may be used, or two or more kinds thereof may be used.
Moreover, when the color material liquid in the present invention is a color material liquid for a black matrix of a color filter, a black pigment can be used as the color material.
Examples of the black pigment include carbon black.
The achromatic organic pigment such as black may be the achromatic pigment alone or may be a mixture with a colored pigment such as red, green and blue.

  From the viewpoint of chemical structure and light transmission spectrum, preferred organic pigments in the present invention include anthraquinone pigments such as Pigment Red 177; diketopyrrolopyrrole pigments such as Pigment Red 254; and azomethine pigments such as Pigment Yellow 150. Azo pigments such as pigment yellow 138; dioxazine pigments such as pigment violet 23; phthalocyanine pigments such as pigment blue 15: 6; benzimidazolone pigments such as pigment yellow 180; quinoxaline pigments such as pigment yellow 213; Pigment; isoindoline pigment; isoindolinone pigment; indanthrene pigment; perylene pigment;

  In particular, the organic pigment (coloring material) is one or more selected from the group consisting of an anthraquinone pigment, a diketopyrrolopyrrole pigment, an azo pigment, a quinophthalone pigment, a dioxazine pigment, and a phthalocyanine pigment from the viewpoint of exhibiting the effects of the present invention. Particularly preferred are organic pigments.

  In the present invention, organic pigments (coloring materials) having the same chemical structure skeleton, that is, the same system may be used singly or in combination of two or more. Two or more types may be used across the system. Moreover, a mixed crystal may be sufficient.

The organic pigment having the above-mentioned chemical structure is often used as an organic pigment (coloring material) for a color filter, so a colorant dispersion with a high concentration is often required. In particular, the effects of the present invention are particularly likely to be exhibited because the specific metal element is likely to be mixed in the manufacturing process.
Specifically, for example, Pigment Red 254, Pigment Red 177, Pigment Yellow 150, Pigment Yellow 185, Pigment Yellow 138, Pigment Yellow 139, Pigment Blue 15: 6, Pigment Violet 23, Pigment Green 58, or Pigment Green 59 are described above. Particularly preferred for reasons.

In addition, as the organic pigment in the present invention, a lake pigment in which a dye is insolubilized by using a known lake (chlorination) technique can also be used.
The dye used as a raw material for the lake pigment can be appropriately selected from conventionally known dyes. Examples of such dyes include azo dyes, metal complex azo dyes, anthraquinone dyes, triphenylmethane dyes, xanthene dyes, cyanine dyes, naphthoquinone dyes, quinoneimine dyes, methine dyes, and phthalocyanines. And dyes, perinone dyes, dipyrromethene dyes, and the like.

  Of these, xanthene dyes (xanthene acid dyes) are preferred from the viewpoint of high heat resistance as dyes used as raw materials for lake pigments. The xanthene acid dye preferably has a compound represented by the following general formula (II), that is, a rhodamine acid dye.

［一般式（ＩＩ）中、Ｒ^Ｉ〜Ｒ^ＩＶは、それぞれ独立に、水素原子、アルキル基、アリール基、又はヘテロアリール基を表し、Ｒ^ＩとＲ^ＩＩＩ、Ｒ^ＩＩとＲ^ＩＶが結合して環構造を形成してもよい。Ｒ^Ｖは、酸性基、Ｘは、ハロゲン原子を表す。ｍは０〜５の整数を表す。一般式（ＩＩ）は酸性基を１個以上有するものであり、ｎは０以上の整数である。］

[In General Formula (II), each of R ^{I to} R ^IV independently represents a hydrogen atom, an alkyl group, an aryl group, or a heteroaryl group, and R ^I and R ^III , R ^II and R ^IV are bonded to each other. A ring structure may be formed. R ^V represents an acidic group, and X represents a halogen atom. m represents an integer of 0 to 5. The general formula (II) has one or more acidic groups, and n is an integer of 0 or more. ]

The alkyl group in R ^{I to} R ^IV is not particularly limited. Examples thereof include a linear or branched alkyl group having 1 to 20 carbon atoms which may have a substituent. Among them, a linear or branched alkyl group having 1 to 8 carbon atoms is preferable. More preferably, it is a linear or branched alkyl group having 1 to 5 carbon atoms. The substituent that the alkyl group may have is not particularly limited, and examples thereof include an aryl group, a halogen atom, a hydroxyl group, and the like, and the substituted alkyl group includes a benzyl group, and further, a substituent. May have a halogen atom or an acidic group.
The aryl group in R ^{I to} R ^IV is not particularly limited. For example, the C6-C20 aryl group which may have a substituent is mentioned, Among these, the phenyl group, naphthyl group, etc. which may have a substituent are preferable. Examples of the heteroaryl group in R ^{I to} R ^IV include an optionally substituted heteroaryl group having 5 to 20 carbon atoms, and those containing a nitrogen atom, an oxygen atom, a sulfur atom, etc. as a hetero atom. preferable.
Examples of the substituent that the aryl group or heteroaryl group may have include an alkyl group having 1 to 5 carbon atoms, a halogen atom, an acidic group, a hydroxyl group, an alkoxy group, a carbamoyl group, and a carboxylic acid ester group. .
R ^{I to} R ^IV may be the same or different.

Specific examples of the acidic group or a salt thereof include a carboxy group (—COOH), a carboxylate group (—COO ⁻ ), a carboxylate group (—COOM, where M represents a metal atom), a sulfonate group (—SOO). ₃ ^-), a sulfo group _(-SO 3 H), sulfonate _(-SO 3 M, wherein M represents a metal atom), and among them, a sulfonato group (-SO ₃ ^-.), a sulfo group It is preferable to have at least one of (—SO ₃ H) or a sulfonate group (—SO ₃ M). Examples of the metal atom M include a sodium atom and a potassium atom.

As the compound represented by the general formula (II), Acid Red 50, Acid Red 52, Acid Red 289, Acid Violet 9, Acid Violet 30, Acid Blue 19 and the like are preferable from the viewpoint of increasing brightness.
From the viewpoint of heat resistance, a compound having a betaine structure in which m = 1 and n = 0 in general formula (II) is preferable.
Also, among them, m = 1 and n = 0, R ^I and R ^II are each independently an alkyl group or an aryl group, and R ^III and R ^IV are each independently an aryl group or a heteroaryl group. It is preferable from the viewpoint that a colored layer excellent in luminance and light resistance can be formed.
Although the manufacturing method of the compound represented by the said general formula (II) is not specifically limited, For example, it can obtain by referring to Unexamined-Japanese-Patent No. 2010-211198.

  In the metal lake color material of the xanthene acid dye, those containing a metal atom are used as a lake agent. By using a rake agent containing a metal atom, the heat resistance of the coloring material is increased. As such a rake agent, a rake agent containing a metal atom that becomes a divalent or higher valent metal cation is preferable.

  As a guide, if the amount of the lake pigment dissolved in 10 g or less of the solvent (or mixed solvent) is 10 mg or less, the lake pigment (dye) can be dispersed in the solvent (or mixed solvent). Can be determined.

<< Acid dye derivative >>
It is preferable that the organic pigment in the present invention contains an acidic dye derivative because the effects of the present invention are easily achieved. When an acidic dye derivative is used, it can be finely dispersed, and when used for a color filter, a colorant having high dispersion stability, high contrast, high light transmittance, and high brightness. This is preferable because a dispersion can be obtained.
Moreover, when an acidic pigment derivative is used, the effect of reducing the specific metal element in the present invention is more exhibited, and the above effect can be achieved synergistically.

Here, the “acidic dye derivative” refers to a dye derivative having an acidic group in its chemical structure, and particularly preferably an anthraquinone pigment, a diketopyrrolopyrrole pigment, an azo pigment, a quinophthalone pigment, a dioxazine pigment, and a phthalocyanine pigment. A dye derivative having one or more pigment skeletons selected from the group and having an acidic group.
Among the acidic dye derivatives, a quinophthalone dye derivative that has a pigment skeleton of a quinophthalone pigment and has an acidic group is more preferable in terms of improving dispersibility.

The acidic group of the acidic dye derivative is preferably at least one selected from the group consisting of a sulfo group, a sulfonamide group, a carboxy group, and a metal salt or ammonium salt of the functional group.
The average amount of acidic groups introduced per molecule of pigment is not particularly limited, but is preferably 0.5 to 5, more preferably 0.6 to 4, and particularly preferably 0.7 to 3.5. preferable.
By introducing acidic groups, fine dispersion is possible. When used for color filters, it has advantages such as high dispersion stability, high contrast, high light transmittance, and high brightness. It is preferable because a material dispersion can be obtained, and by reducing the specific metal element, a synergistic effect can be obtained, and the effect can be further obtained.

The organic pigment in the present invention preferably contains a pigment and an acidic dye derivative. The acidic dye derivative interacts with the pigment, and is adsorbed on or taken into the pigment surface when producing pigment particles.
In addition, by adsorbing to the surface of the pigment, the surface of the pigment is made acidic, and the affinity with the pigment dispersant is increased as compared with the organic pigment itself, and it also acts as a mediator with the pigment dispersant.
Further, the acidic pigment derivative that interacts with the basic dispersant is adsorbed on the pigment surface, whereby the basic dispersant can be efficiently positioned on the pigment surface. As a result, fine dispersion and dispersion stabilization are possible, which is excellent when used for a color filter.

The content of the acidic dye derivative in the whole organic pigment in the present invention is not particularly limited, but is preferably 0.5 to 30 parts by mass, and 1 to 15 parts by mass with respect to 100 parts by mass of the pigment. Is more preferable, and 2 to 10 parts by mass is particularly preferable.
By setting the above lower limit value or more, stable dispersion and fine dispersion are possible, and there is a synergistic effect with the reduction of the specific metal element described above. By setting the upper limit value or less, the change in chromaticity due to excess of the acidic dye derivative Can be suppressed.

  In the present invention, one or more of the above acidic dye derivatives may be used as the organic pigment, and one or more of the above acidic dye derivatives may be used for one kind of pigment. Good.

The acidic dye derivative may be added to the pigment particle dispersion at any stage. However, in consideration of adsorbing or incorporating the acidic dye derivative on the pigment surface, a process for producing a pigment. In the process of synthesizing the pigment, during the process of solvent salt milling with a kneader or the like, during the process after the process, the pigment is dry-pulverized with an attritor or the like. It can be added during the process, during the dispersing process, during the treatment process after dispersion, and the like.
It can also be added to a good solvent or a poor solvent in the reprecipitation method, and can also be added after concentration or redispersion after precipitation of pigment particles.

  According to the present invention, since the dispersant is a (salt type) basic block type dispersant or a (salt type) basic graft type dispersant, which will be described later, the salt forming site is a pigment, and particularly Strongly adsorbable to acidic pigment derivatives adsorbed on the pigment surface, while the main and side chains of the polymer dispersant that has an affinity for the solvent improve the dispersibility of the pigment dispersion for color filters. Thus, the concentration of the organic pigment can be increased, the viscosity can be reduced, and the change in the pigment dispersion over time can be suppressed. As a result, the developability is improved in the evaluation of the color filter coloring composition.

<< Dye >>
In the present invention, a dye can also be used as a coloring material. As a specific example of the dye, the same “dye as a raw material of the lake pigment” described above can be used.

As a guide, if the amount of dye dissolved in 10 g of solvent (or mixed solvent) is 10 mg or less, the dye can be dispersed in the solvent (or mixed solvent), and the colorant dispersion should be used. Can do.
A dye that dissolves in excess of 10 mg per 10 g of solvent (or mixed solvent) can be dissolved in a solvent to form a colorant solution.

<< Colorant particle size >>
The particle size of the color material is not particularly limited, but is preferably 30 nm to 500 nm, more preferably 40 nm to 300 nm, and particularly preferably 50 nm to 200 nm.
If the particle size is too small, dispersibility and re-dissolvability may decrease, and workability may decrease due to contamination with fine powder.
On the other hand, if the particle size is too large, the dispersibility, dispersion stability, light resistance and the like deteriorate, and the effect of reducing the content of specific metal elements such as calcium (Ca) and iron (Fe) becomes difficult to appear. The effects of the present invention are not achieved, and in particular, good contrast may not be obtained.

  Here, “re-solubility” refers to the property that the solid content of the color filter coloring composition once dried dissolves again in the solvent. For example, when the color filter coloring composition adheres to the tip of the die lip when applying with a die coater, a solidified product is generated by drying when the drying speed is fast, but the solidified product is colored when the application is resumed. If it is not easily dissolved in the filter coloring composition, a part of the solidified product on the die lip is peeled off and easily adheres to the colored layer of the color filter, causing a foreign matter defect.

<Dispersant>
The color material liquid for color filter and the coloring composition for color filter of the present invention can contain a dispersant as required.
The dispersant in the present invention can be appropriately selected from known dispersants and used, for example, cationic, anionic, nonionic, amphoteric, silicone-based, fluorine-based surfactants; polymers Dispersing agent; a low molecular dispersing agent can be used. Among these, a polymer dispersant (including a polymer surfactant) is preferable because it can be uniformly and finely dispersed.

Examples of the polymer dispersant include polymer dispersants such as modified polyurethane, modified polyacrylate, modified polyester, and modified polyamide.
Specifically, (co) polymers of “unsaturated carboxylic acid esters such as (meth) acrylic acid esters”; (parts of “(co) polymers of unsaturated carboxylic acid such as (meth) acrylic acid”) ) Amine salt, (partially) ammonium salt or (partially) alkylamine salt; (co) polymer of “unsaturated carboxylic acid ester such as (meth) acrylic acid ester having primary, secondary or tertiary amino group” , (Partial) salt of amino group of (co) polymer, (partial) acid-modified product of amino group of (co) polymer; “hydroxyl group-containing unsaturated carboxylic acid such as hydroxyl group-containing (meth) acrylate ester” Ester (co) polymers and their modifications; polyurethanes; unsaturated polyamides; polysiloxanes; long-chain polyaminoamide phosphates; containing poly (lower alkylene imines) and free carboxy groups Amides and their salts obtained by the reaction of Riesuteru; and the like.

<< High molecular dispersant and low molecular dispersant >>
The “dispersing agent” in the present invention is not particularly limited, and a known polymer dispersing agent or low molecular dispersing agent can be used for dispersing the coloring material.

Examples of the polymer dispersant include, for example, a random type dispersant made of a random (co) polymer; a block type dispersant made of a block copolymer; ) Graft type dispersants composed of a graft (co) polymer having repeating units bonded thereto, and the like.
In addition, a salt-type dispersant in which at least a part of the structural units of the (co) polymer has a salt structure is also preferable. Such salt type applies to all of the above-mentioned random type dispersant, block type dispersant and graft type dispersant, and they are preferably used.

  Examples of the polymer dispersant include (co) polymers of unsaturated carboxylic esters such as poly (meth) acrylic acid esters; (co) polymers of unsaturated carboxylic acids such as poly (meth) acrylic acid ( (Partial) amine salt, (partial) ammonium salt and (partial) alkylamine salt; (co) polymer of hydroxyl group-containing unsaturated carboxylic acid ester such as hydroxyl group-containing poly (meth) acrylic acid ester or modified products thereof; polyurethanes Unsaturated polyamides; polysiloxanes; long-chain polyaminoamide phosphates; amides obtained by the reaction of poly (lower alkyleneimines) with free carboxy group-containing polyesters, salts thereof, and polyester groups in the side chain ( And a copolymer of (meth) acrylate.

  Among them, poly (meth) acrylate, sodium maleate-olefin copolymer, terminal carboxyl group-containing polyester (for example, Japanese Examined Patent Publication No. 54-34009); tetrakis (2-hydroxyalkyl) ethylenediamine is used as a starting material. Polyester having an acidic group and / or a basic group (JP-A-2-245231, etc.); a macromonomer (an oligomer having a polymerizable unsaturated group at one end), a monomer having a hydroxyl group, and a carboxy group-containing monomer are copolymerized A copolymer obtained by copolymerization of a macromonomer (an oligomer having a polymerizable unsaturated group at one end) and a monomer having a nitrogen atom (Japanese Patent Laid-Open No. Hei 8-259987). 10-339949 etc.) etc. are preferable.

Examples of the low molecular dispersant include an anionic compound having a sulfonic acid group, a carboxylic acid group, etc .; a cationic compound having a salt of an aliphatic amine, a quaternary ammonium salt, etc .; a non-ion having a hydroxyl group, an oxyethylene chain, etc. Compound; polymer compound; and the like.
Specific examples include sorbitan fatty acid esters, polyoxyethylene alkylamines, alkyldiamines, alkanolamine derivatives (US Pat. No. 3,536,510), and the like.

  Among the dispersants, a polymer dispersant is preferable, and among the polymer dispersants, a basic block type dispersant and / or a basic graft type dispersant is functionally separated from the coloring material adsorption site and the solvent affinity site. In addition to “total content of calcium (Ca) and iron (Fe)” described later, and “total content of calcium (Ca) and iron (Fe)”, magnesium (Mg) and aluminum (Al) And the total content of chromium (Cr) "below a certain value, there is a synergistic effect with the effects of the present invention such as dispersion stability, colored image properties, and developability, It is preferable from the point of having a synergistic effect when used in combination.

  Here, “the dispersant is a basic block dispersant and / or a basic graft dispersant” means that the dispersant is a basic block dispersant, a basic graft dispersant. A combination of a basic block type dispersant and a basic graft type dispersant, a basic block type dispersant, and a dispersant that is also a basic graft type dispersant. Also means. Further, the combined use of a dispersant that is neither a basic block type dispersant nor a basic graft type dispersant is excluded.

<< Basic Block Dispersant >>
The “basic block type dispersant” means a monomer having a basic group such as amino group, monoalkylamino group, dialkylamino group, amide group; salts thereof; trialkylammonium group; And a dispersant composed of a block copolymer of another monomer different from the monomer (hereinafter abbreviated as “b monomer”), which may be a binary copolymer or a ternary or more A copolymer may be used. The “a monomer” includes those obtained by replacing the above “alkyl” with “aryl”, “aralkyl”, “alkenyl” and the like.

  The a monomer includes a quaternary ammonium base and / or a (meth) acrylate compound containing a secondary or tertiary amino group in which hydrogen bonded to nitrogen may be substituted with a substituent or a salt thereof. A tertiary amino group and / or a quaternary ammonium base is particularly preferable.

［一般式（１）中、Ｒ^１は水素原子又はメチル基、Ａは２価の連結基、Ｒ^２及びＲ^３は、それぞれ独立して、水素原子又はヘテロ原子を含んでもよい炭化水素基を表し、Ｒ^２及びＲ^３が互いに結合して環構造を形成してもよい。］ As said a monomer, what gives the structural unit represented by the following general formula (1), or the salt form (after-mentioned) of the structural unit represented by the following general formula (1) is more preferable. That is, in the present invention, the above color material liquid for a color filter, in which the dispersant is a basic block copolymer containing a structural unit represented by the following general formula (1) or a salt form thereof, is preferable.

[In General Formula (1), R ¹ is a hydrogen atom or a methyl group, A is a divalent linking group, R ² and R ³ are each independently a hydrocarbon group that may contain a hydrogen atom or a heteroatom. R ² and R ³ may be bonded to each other to form a ring structure. ]

Specifically, the salt is composed of, for example, a tertiary amino group such as a unit forming a basic block copolymer, and a salt formed with an acid such as a sulfonic acid compound or a phosphoric acid compound. The thing which was done is mentioned.
Further, a tertiary amino group such as dimethylaminoethyl (meth) acrylate, which is a unit forming a basic block copolymer, may be converted to a quaternary ammonium salt with an aryl halide, an aralkyl halide or the like.

  When the monomer a gives the repeating unit represented by the general formula (1), a compound that reacts with an amino group after appropriately copolymerizing with another polymerizable monomer, for example, a sulfonic acid compound, phosphorus It may be reacted with an acid compound such as an acid compound or a carboxylic acid compound; a halogen compound such as an aryl halide, an alkyl halide or an aralkyl halide;

  Examples of the sulfonic acid compound include compounds represented by the following general formula (2). That is, as the salt-formed compound, the block copolymer is a compound represented by the following general formula (2) in which at least a part of nitrogen of the structural unit represented by the general formula (1) becomes a cation. The above-mentioned color material liquid for a color filter, which is a salt-type block copolymer in which one or more compounds selected from the group consisting of an anion and a salt are formed, is preferable.

［一般式（２）において、Ｒ^ａは、炭素数１〜２０の直鎖、分岐鎖若しくは環状のアルキル基；置換基を有してもよいビニル基、フェニル基若しくはベンジル基又は−Ｏ−Ｒ^ｅを表し、Ｒ^ｅは、炭素数１〜２０の直鎖、分岐鎖若しくは環状のアルキル基；置換基を有してもよいビニル基、フェニル基若しくはベンジル基；又は炭素数１〜４のアルキレン基を介した（メタ）アクリロイル基を表す。］

[In General Formula (2), R ^a is a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms; a vinyl group, a phenyl group or a benzyl group which may have a substituent, or —O—R represents ^e, R ^e is, having 1 to 20 carbon atoms straight chain, branched chain or cyclic alkyl group; substituent optionally a vinyl group which may have a phenyl group or a benzyl group; or an alkylene of 1 to 4 carbon atoms It represents a (meth) acryloyl group via a group. ]

  Examples of the above “halogen compounds such as halogenated aryl, alkyl halide, and halogenated aralkyl” include compounds represented by the following general formula (3). That is, as the salt-formed compound, the block copolymer is a compound represented by the following general formula (3) in which at least a part of nitrogen of the structural unit represented by the general formula (1) becomes a cation. The above-mentioned color material liquid for a color filter, which is a salt-type block copolymer in which one or more compounds selected from the group consisting of an anion and a salt are formed, is preferable.

［一般式（３）において、Ｒ^ｂ、Ｒ^ｂ’及びＲ^ｂ”は、それぞれ独立に、水素原子；酸性基若しくはそのエステル基；置換基を有してもよい炭素数１〜２０の、直鎖、分岐鎖若しくは環状のアルキル基；置換基を有してもよいビニル基、フェニル基若しくはベンジル基；又は−Ｏ−Ｒ^ｆを表し、Ｒ^ｆは、置換基を有してもよい、炭素数１〜２０の直鎖、分岐鎖若しくは環状のアルキル基；置換基を有してもよい、ビニル基、フェニル基若しくはベンジル基；又は炭素数１〜４のアルキレン基を介した（メタ）アクリロイル基を表し、Ｘは、塩素原子、臭素原子又はヨウ素原子を表す。］
一般式（３）中のＸが、カウンターアニオン（Ｘ⁻）となり塩を形成する。

[In General Formula (3), R ^b , R ^{b ′,} and R ^{b ″} each independently represent a hydrogen atom; an acidic group or an ester group thereof; A chain, a branched chain or a cyclic alkyl group; a vinyl group which may have a substituent, a phenyl group or a benzyl group; or —O—R ^f , wherein R ^f is a carbon which may have a substituent, A linear, branched or cyclic alkyl group of 1 to 20; an optionally substituted vinyl group, phenyl group or benzyl group; or (meth) acryloyl via an alkylene group of 1 to 4 carbon atoms Represents a group, and X represents a chlorine atom, a bromine atom or an iodine atom.]
X in the general formula (3) becomes a counter anion (X ⁻ ) to form a salt.

  As said phosphoric acid compound, the compound represented by following General formula (4) is mentioned. That is, as the salt-formed compound, the block copolymer is a compound represented by the following general formula (4) in which at least a part of the nitrogen of the structural unit represented by the general formula (1) becomes a cation. The above-mentioned color material liquid for a color filter, which is a salt-type block copolymer in which one or more compounds selected from the group consisting of an anion and a salt are formed, is preferable.

［一般式（４）において、Ｒ^ｃ及びＲ^ｄは、それぞれ独立に、水素原子；水酸基；炭素数１〜２０の、直鎖、分岐鎖若しくは環状のアルキル基；置換基を有してもよい、ビニル基、フェニル基若しくはベンジル基；又は−Ｏ−Ｒ^ｇを表し、Ｒ^ｇは、炭素数１〜２０の、直鎖、分岐鎖若しくは環状のアルキル基；置換基を有してもよい、ビニル基、フェニル基若しくはベンジル基；又は炭素数１〜４のアルキレン基を介した（メタ）アクリロイル基を表す。ただし、Ｒ^ｃ及びＲ^ｄの少なくとも１つは炭素原子を含む。］

[In General Formula (4), R ^c and R ^d each independently have a hydrogen atom; a hydroxyl group; a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms; and a substituent. , a vinyl group, a phenyl group or benzyl group; represents or -O-R ^g, R ^g is 1 to 20 carbon atoms, straight-chain, branched or cyclic alkyl group; which may have a substituent, A vinyl group, a phenyl group or a benzyl group; or a (meth) acryloyl group via an alkylene group having 1 to 4 carbon atoms. However, at least one of R ^c and R ^d contains a carbon atom. ]

  Specific examples of the a monomer include (meth) acrylic acid dialkylaminoalkyl ester, (meth) acrylic acid diarylaminoalkyl ester, (meth) acrylic acid diaralkylaminoalkyl ester, and (meth) acrylic acid. And dialkenylaminoalkyl esters thereof, salts thereof and the like. Examples of the compound used when forming “the salts thereof” include compounds represented by the above general formulas (2) to (4).

  More specifically, for example, tertiary amino group-containing compounds such as dimethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate, diethylaminoethyl (meth) acrylate, diethylaminopropyl (meth) acrylate; Salts of group-containing compounds; Amides such as N-methylol (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide (Meth) acryloylaminopropyltrimethylammonium chloride, (meth) acryloyloxyethyltrimethylammonium chloride, (meth) acryloyloxyethyltriethylammonium chloride, (meth) acrylic Yl salts oxyethyl benzyl dimethyl ammonium chloride quaternary ammonium group-containing compounds such as chloride; and the like.

  Particularly preferred are dimethylaminoethyl (meth) acrylate, sulfonate of dimethylaminoethyl (meth) acrylate, phenylphosphonate of dimethylaminoethyl (meth) acrylate, (meth) acryloyloxyethylbenzyldimethylammonium chloride, and the like. It is done.

  The basic block copolymer in which the monomer a is (co) polymerized or a salt-type dispersant thereof can be finely dispersed or stabilized when used for a color filter, thereby increasing the colorant concentration. However, good dispersion stability can be maintained. That is, it is possible to increase the concentration of the colorant dispersion or coloring composition, and to increase the color rendering, thinning, high contrast, good developability, good resolubility, etc. of the color filter obtained by using it. The above-described effects of the present invention are easily exhibited due to a synergistic effect with limiting the content of the specific metal element.

The color material is firmly adsorbed to the nitrogen site contained in the monomer a (preferably the structural unit represented by the general formula (1)) and has excellent color material dispersibility, and is firmly adsorbed to the nitrogen site. Thus, the color material surrounded by the dispersant is easily flown while being adsorbed by the dispersant during development, and the color material is not left on the base material, and the generation of the residue is easily suppressed.
Similarly, the color material firmly adsorbed on the nitrogen site and surrounded by the dispersing agent is likely to flow while adsorbed on the dispersing agent by the re-dissolvable solvent.

Examples of the b monomer include, as aromatic group-containing monomers, acrylates such as benzyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, and phenoxyethyl (meth) acrylate; styrenes such as styrene Vinyl ethers such as phenyl vinyl ether; and the like.
Further, methyl (meth) acrylate, ethyl (meth) acrylate (n-propyl) (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, octyl (meth) acrylate, (meth) acrylic (Meth) acrylic acid ester monomers such as 2-ethylhexyl acid, glycidyl (meth) acrylate, and hydroxyethyl (meth) acrylate; vinyl acetate; acrylonitrile; allyl group-containing compounds such as allyl alkyl ether;

As the b monomer, a carboxy group-containing monomer is also preferable. The carboxy group-containing monomer refers to a monomer containing a copolymerizable unsaturated double bond and a carboxy group.
Examples of the carboxy group-containing monomer include (meth) acrylic acid, vinyl benzoic acid, maleic acid, maleic acid monoalkyl ester, fumaric acid, itaconic acid, crotonic acid, cinnamic acid, and (meth) acrylic acid dimer. .
Further, an addition reaction product of a monomer having a hydroxyl group such as 2-hydroxyethyl (meth) acrylate and a cyclic anhydride such as maleic anhydride, phthalic anhydride, cyclohexanedicarboxylic anhydride, etc .; ω-carboxy- Examples include polycaprolactone mono (meth) acrylate.
Examples of the carboxy group precursor include a carboxy group-containing monomer using an acid anhydride such as maleic anhydride, itaconic anhydride, and citraconic anhydride.
Among these, (meth) acrylic acid is particularly preferable from the viewpoints of copolymerizability, cost, solubility, and the like.

  A comprehensive reason for the selection of the b monomer is that it has an affinity for a solvent and enables fine dispersion and dispersion stabilization, particularly when used for a color filter.

  When the polymerization block containing a monomer or a salt thereof is “A”, and the polymerization block containing b monomer is “B”, the basic block dispersant in the present invention is an AB block copolymer, A- The block may be any of a B-A block copolymer, a B-A-B block copolymer, an A-B-A-B block copolymer, and more block copolymers, preferably an A-B block. It is a copolymer.

  In the block copolymer containing a monomer or a salt thereof, the block portion containing a monomer or a salt thereof is adsorbed to the coloring material, and the block portion containing no a monomer or a salt thereof has an affinity for the solvent. Further, the dispersibility of the color material can be improved.

The weight average molecular weight (Mw) of the basic block copolymer in the present invention is not particularly limited, but is preferably in the range of 500 to 100,000, more preferably in the range of 1000 to 30,000. It is particularly preferably in the range of ˜20000, and most preferably in the range of 4000 to 15000.
By being within the above range, it is possible to achieve both “wetting ability to disperse the coloring material uniformly” and dispersion stability. Further, when the colorant dispersant of the present application is used as a component of the coloring composition, if the upper limit is not more than the above value, the viscosity of the dispersion does not become too high, and developability and resolution do not decrease, On the other hand, if the lower limit is not less than the above value, sufficient dispersibility can be obtained.

Here, the weight average molecular weight is determined as a standard polystyrene conversion value by (Mw) and gel permeation chromatography (GPC).
The weight average molecular weight (Mw) of the basic block copolymer was measured using HLC-8120GPC manufactured by Tosoh Corporation and N-methylpyrrolidone added with 0.01 mol / L lithium bromide as an elution solvent. The calibration curve polystyrene standards are Mw377400, 210500, 96000, 50400, 20650, 10850, 5460, 2930, 1300, 580 (Easi PS-2 series manufactured by Polymer Laboratories) and Mw1090000 (manufactured by Tosoh Corporation). The measurement column is TSK-GEL ALPHA-M × 2 (manufactured by Tosoh Corporation).

The amine value is not particularly limited, but is preferably 15 to 200 mgKOH / g, more preferably 30 to 150 mgKOH / g, and particularly preferably 40 to 130 mgKOH / g.
If the amine value is too small, sufficient dispersion stability cannot be obtained, and if it is too large, the solubility in a solvent decreases.
The amine value can be determined according to JIS-K7237.

  Moreover, 0-50 mgKOH / g is preferable, as for an acid value, 1-30 mgKOH / g is more preferable, and 2-18 mgKOH / g is especially preferable. Within this range, developability is excellent. Further, when the acid value is not more than the above upper limit, “resist pattern peeling” hardly occurs.

When the molecular weight, amine value, or acid value is in the above range, it is easy to be dispersed, good dispersion stability can be maintained even when the colorant concentration is increased, developability is good, and the content of the specific metal element is limited. The above-described effects of the present invention are easily exhibited due to a synergistic effect.
As a result, a color display obtained using the colorant dispersion liquid has a high contrast, a high light transmittance, and a high luminance display.

<< Basic Graft Type Dispersant >>
The “basic graft type dispersant” refers to a basic dispersant composed of a (co) polymer in which repeating units are bonded as side chains to the main chain.
Specifically, a side chain is synthesized first and then (co) polymerized, that is, a macromonomer having a polymerizable unsaturated group at one end (repeating a polymerizable unsaturated group at one end) Examples thereof include a dispersant made of a (co) polymer having a polymerization component such as an oligomer having a unit.
In addition, a dispersing agent made of a (co) polymer in which a main chain is first synthesized and then a repeating unit is bonded to a pendant (like a branch) as a side chain in some places. Can be mentioned.

The basicity of the “basic graft type dispersant” may be imparted in any way, but the basicity is preferably imparted by copolymerizing a basic nitrogen atom-containing monomer.
The basic monomer to be copolymerized is not particularly limited, and specific examples include the “a monomer” described in the section “Basic Block Dispersant”.

The “macromonomer having a polymerizable group unsaturated group at one end” is not particularly limited, and known ones can be used.
The polymerization component constituting the repeating unit in such a macromonomer is not particularly limited. Specifically, for example, styrene monomers such as styrene and α-methylstyrene; methyl (meth) acrylate, (meth) acrylic Ethyl acetate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, glycidyl (meth) acrylate, benzyl ( (Meth) acrylate monomers such as (meth) acrylate and hydroxyethyl (meth) acrylate; (meth) acrylamide, N-methylolacrylamide, N, N-dimethylacrylamide, N, N-dimethylaminoethylacrylamide, etc. ) Acrylamide mono Chromatography; vinyl acetate; acrylonitrile; allyl group-containing compounds such as allyl alkyl ether; and the like. The macromonomer in the present invention preferably has a unit in which the above polymerization component is polymerized.

In the “basic graft type dispersant”, in addition to the “macromonomer having a polymerizable group unsaturated group at one end” and the “basic monomer to be copolymerized”, other polymerizable monomers are copolymerized. Also good.
The “other polymerizable monomer” is not particularly limited, and specific examples include the “b monomer” described in the section of the “basic block dispersant”.

  The introduction rate of the macromonomer is not particularly limited, but it is preferably introduced at an average ratio of 0.1 to 20 in 100 repeating units of the main chain, and 0.3 to 10 It is particularly preferable to introduce them in proportions.

Although the molecular weight of the basic graft type dispersant in the present invention is not particularly limited, it is usually 1000 to 100,000, preferably 2000 to 40000, more preferably 3000 to 30000, particularly preferably as a weight average molecular weight (Mw) in terms of polystyrene. Is 4000-25000, more preferably 5000-20000.
Within the above range, it is easy to disperse and it becomes possible to finely disperse in the “final dispersion step when preparing the colorant dispersion” or to shorten the dispersion time. As a result, a color display obtained using the colorant dispersion liquid has a high contrast, a high light transmittance, and a high luminance display.

<< Commercial item >>
In the present invention, the commercial product used as a dispersant is not limited, but specifically, for example, EFKA-4046, EFKA-4047, EFKA polymer 10, EFKA polymer 400, EFKA polymer 401, EFKA polymer 4300, EFKA polymer 4310, EFKA polymer 4320, EFKA polymer 4330 (above, manufactured by BASF Japan Ltd.), Disperbyk 111, Disperbyk 161, Disperbyk 165, Disperbyk 167, Disperbyk 182, Disp. Co., Ltd.), SOLPERSE24000, SOLPERSE2 000, SOLSPERSE28000 (manufactured by Lubrizol Corporation), Ajisper (registered trademark) PB821, PB822 (manufactured by Ajinomoto Fine-Techno Co.), and the like.

<Solvent>
The solvent for the color material liquid in the present invention is not particularly limited, and known ones are used.

  Specifically, for example, alcohols such as methanol, ethanol and propanol; ethers such as tetrahydrofuran; propylene glycol monomethyl ether, propylene glycol dimethyl ether, propylene glycol methyl ethyl ether, propylene glycol monoethyl ether, propylene glycol diethyl ether and the like Alkylene glycol ethers; diethylene glycol monomethyl ether, diethylene glycol dimethyl ether, diethylene glycol ethyl methyl ether, diethylene glycol monoethyl ether, diethylene glycol diethyl ether, diethylene glycol monopropyl ether, diethylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dip Dialkylene glycol ethers such as pyrene glycol dimethyl ether, dipropylene glycol methyl ethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol diethyl ether; tripropylene glycol monomethyl ether, tripropylene glycol dimethyl ether, tripropylene glycol methyl ethyl ether, tripropylene glycol Trialkylene glycol ethers such as propylene glycol monoethyl ether and tripropylene glycol diethyl ether; alkylene glycols such as ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate Dialkylene glycol monoalkyl ethers such as diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monopropyl ether acetate, diethylene glycol monobutyl ether acetate, dipropylene glycol monomethyl ether acetate, dipropylene glycol monoethyl ether acetate Ether acetates; diacetates such as ethylene glycol diacetate, propylene glycol diacetate, 1,3-butylene glycol diacetate, diethylene glycol diacetate, triethylene glycol diacetate, dipropylene glycol diacetate, tripropylene glycol diacetate Trialkylene glycol monoalkyl ether acetates such as tripropylene glycol monomethyl ether acetate and tripropylene glycol monoethyl ether acetate; Aromatic hydrocarbons such as toluene and xylene; Methyl ethyl ketone, methyl propyl ketone, methyl amyl ketone, cyclopenta Ketones such as non, cyclohexanone, 4-hydroxy-4-methyl-2-pentanone, methyl isobutyl ketone; ethyl 2-hydroxypropionate, methyl 2-hydroxy-2-methylpropionate, 2-hydroxy-2-methylpropion Ethyl acetate, acetic acid-3-methoxybutyl, acetic acid-3-methoxy-3-methylbutyl (3-methoxy-3-methyl-1-butyl acetate), ethyl ethoxyacetate, hydroxyacetate , Methyl 2-hydroxy-2-methylbutanoate, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, methyl 2-hydroxypropanoate, ethyl acetate, And esters such as butyl acetate, methyl lactate, ethyl lactate, isoamyl acetate, methyl benzoate, ethyl benzoate, propyl benzoate, and butyl benzoate.

  Among them, in particular, propylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate, ethyl 3-ethoxypropionate, 3-methoxybutyl acetate, 3-methoxy-3-methylbutyl acetate (3-methoxy-3-methyl-1 -Butyl acetate), diethylene glycol ethyl methyl ether, propylene glycol monomethyl ether, and methyl 2-hydroxypropanoate are preferred.

  The color material liquid of the present invention uses a mixed solvent containing two or more kinds of solvents from the viewpoints of developability and re-solubility.

  When a mixed solvent is used, the first solvent is a glycol ether acetate solvent because of its high safety; moderate volatility; good dispersibility due to moderate solubility; (The aforementioned alkylene glycol monoalkyl ether acetates, dialkylene glycol monoalkyl ether acetates, trialkylene glycol monoalkyl ether acetates, etc.) are preferably used. Among them, ethylene glycol monomethyl ether acetate or propylene glycol monomethyl ether acetate having a boiling point (boiling point at atmospheric pressure; hereinafter the same) is less than 150 ° C. is more preferable, and propylene glycol monomethyl ether acetate (PGMEA) is particularly preferable. .

As the second solvent (a solvent other than the first solvent), a solvent having an alcoholic hydroxyl group (hereinafter sometimes referred to as “alcohol solvent”) or a solvent having a boiling point of 150 ° C. or higher is preferable.
A 2nd solvent may be used individually by 1 type, and 2 or more types may be mixed and used for it.

When an alcohol solvent is used as the second solvent, the dispersibility is good and the re-solubility is good. Moreover, it has high polarity and is excellent in dissolving dyes.
Examples of alcohol solvents include propylene glycol monomethyl ether (boiling point 121 ° C), 3-methoxy-3-methyl-1-butanol (boiling point 174 ° C), diacetone alcohol (boiling point 166 ° C), ethyl lactate (boiling point 151 ° C). ) And the like.

In the case of using a mixed solvent, the content of the alcohol solvent is preferably 10% by mass or less, more preferably 5% by mass or less, and still more preferably 2% by mass or less in the total solvent. Moreover, 0.1 mass% or more is preferable, 0.3 mass% or more is more preferable, and 1 mass% or more is still more preferable.
Within the above range, the solubility of the dispersant will be good, and since the dissolution of the dispersant in the first solvent will not be hindered, the dispersion stability will be good.

When the first solvent is a solvent having a boiling point of less than 150 ° C., use of a solvent having a boiling point of 150 ° C. or more as the second solvent makes it difficult for drying unevenness to occur and improves re-solubility.
Examples of solvents having a boiling point of 150 ° C. or higher include diethylene glycol ethyl methyl ether (boiling point 179 ° C.), 3-methoxy-3-methyl-1-butyl acetate (boiling point 188 ° C.), ethyl 3-ethoxypropionate (boiling point 170 ° C.). 3-methoxybutyl acetate (acetic acid-3-methoxybutyl) (boiling point 172 ° C.), ethyl carbitol acetate (diethylene glycol monoethyl ether acetate) (boiling point 217 ° C.), butyl carbitol acetate (BCA, diethylene glycol monobutyl ether acetate) ( Boiling point 247 ° C.), diethylene glycol monobutyl ether (boiling point 231 ° C.), propyl benzoate (boiling point 230 ° C.), 1,3-butylene glycol diacetate (boiling point 232 ° C.) and the like.

The “boiling point of a solvent having a boiling point of 150 ° C. or higher” used as the second solvent is preferably 170 ° C. or higher, more preferably 190 ° C. or higher, and particularly preferably 210 ° C. or higher. Moreover, 270 degrees C or less is preferable, 250 degrees C or less is more preferable, and 230 degrees C or less is especially preferable.
When it is at least the above lower limit, the re-solubility of the colored composition tends to be particularly good. Moreover, when it is below the above upper limit, drying unevenness hardly occurs.

When a mixed solvent is used, the content of the solvent having a boiling point of 150 ° C. or higher is preferably 30% by mass or less, more preferably 20% by mass or less, and still more preferably 15% by mass or less in the total solvent. Moreover, 1 mass% or more is preferable, 3 mass% or more is more preferable, and 5 mass% or more is still more preferable.
Within the above range, drying unevenness is unlikely to occur, and the drying time does not become too long and the productivity is improved.

Further, by using an alcohol solvent and a solvent having a boiling point of 150 ° C. or higher as the second solvent, the re-solubility becomes extremely good and drying unevenness is hardly generated.
In this case, the content ratio (mass basis) of the solvent having a boiling point of 150 ° C. or higher with respect to the alcohol solvent is preferably 0.1 or more and 25 or less, more preferably 0.3 or more and 20 or less, and particularly preferably 0.5 or more and 10 or less. .

  The boiling point of the “solvent having a boiling point of 150 ° C. or higher” is preferably 240 ° C. or lower, particularly preferably 200 ° C. or lower, from the viewpoint that the drying time does not become too long.

<Other ingredients>
The color material liquid may contain other components such as an alkali-soluble resin described later as long as the effects of the present invention are not impaired.

<Content ratio>
In the color material liquid for color filter in the present invention, the content ratio of the color material, the dispersant and the solvent is not particularly limited, but the following is preferable.
The dispersant is preferably 5 to 200 parts by weight, more preferably 10 to 150 parts by weight, particularly preferably 15 to 100 parts by weight, and most preferably 20 to 60 parts by weight with respect to 100 parts by weight of the color material.
Moreover, 3-40 mass parts is preferable with respect to 100 mass parts of color material liquids, 5-35 mass parts is more preferable, and 7-30 mass parts is especially preferable.

When the content ratio of the coloring material and the dispersing agent is as described above, the coloring material is easily dispersed, excellent dispersion stability is obtained, a coloring material dispersion having a high coloring material concentration is obtained, and the dispersion time is shortened. It becomes possible.
As a result, the color filter obtained using the color material dispersion exhibits the above-described effects, and can provide a high color rendering, high contrast, thin film, high light transmittance, and high brightness display.

  Further, when it is the above-mentioned “content ratio of colorant and solvent”, it is excellent in dispersibility, dispersion stability, solubility, and the like, adjusted to a suitable viscosity, and in the colorant liquid of the present invention, at least a polymerization initiator and This is preferable because, when an alkali-soluble resin (and preferably a polymerizable polyfunctional compound) is contained to obtain a colored composition, the content ratio thereof can be easily adjusted to an optimum value.

<Distribution method>
The above-mentioned coloring material is dispersed and contained in a solvent in the presence of a dispersant. The effect of the present invention is particularly exerted when wet dispersed.

  In the present invention, the dispersion time is not particularly limited, but is preferably 0.01 to 50 hours, more preferably 0.02 to 30 hours, and more preferably 0.05 to 10 so that the dispersed particle diameter of the coloring material is suitable. Time is particularly preferred.

<Content of specific metal element in colorant liquid>
The color material liquid for a color filter in the present invention is characterized in that the total mass of calcium (Ca) and iron (Fe) contained in the color material liquid is 180 ppm by mass or less with respect to the entire color material liquid. To do.
The total mass of calcium (Ca) and iron (Fe) is preferably as small as possible unless cost is taken into consideration. Specifically, the total mass of the colorant liquid is preferably 140 ppm by mass or less, More preferably, it is 70 mass ppm or less, Especially preferably, it is 30 mass ppm or less, More preferably, it is 15 mass ppm or less, Most preferably, it is 5 mass ppm or less.

  When the "total mass of calcium (Ca) and iron (Fe) contained in the color material liquid" is not more than the above upper limit, it can be dispersed well even if the color material concentration contained in the color material liquid is increased. A color material liquid for a color filter that maintains good dispersion stability and hardly deteriorates with time despite a high color material concentration can be obtained.

In addition, when a coloring composition for a color filter is produced using a coloring material liquid whose “total mass of calcium (Ca) and iron (Fe) contained in the coloring material liquid” is not more than the above upper limit, The color material density can be increased, and as a result, a color filter that achieves a high color density even with a low film thickness can be obtained.
When such a color material solution is used, the color filter can be reduced in film thickness, the color mixture of parallax can be reduced, high color rendering can be achieved, and a color composition or color filter excellent in developability in patterning can be obtained.

  In the coloring composition of the present invention obtained by using a color material solution with a limited amount of the metal, the color material concentration can be increased, and good dispersion performance, dispersion stability performance, and solubility can be obtained, and at the time of manufacturing a color filter. Good developability is achieved. That is, for example, in an alkaline developer, an unexposed portion easily dissolves the composition in the coloring composition together with the coloring material.

  The lower limit of “the total mass of calcium (Ca) and iron (Fe) contained in the color material solution” is not particularly limited, but is preferably 1 mass ppm or more, and particularly preferably 3 mass ppm or more. If it is at least the above lower limit, it is sufficient for improving dispersibility / solubility and improving developability, so that the cost required for excessive removal of metal elements is not required.

In the color material liquid for color filter in the present invention, the total mass of magnesium (Mg), aluminum (Al) and chromium (Cr) contained in the color material liquid is further 200 ppm by mass with respect to the whole color material liquid. The following is preferable.
The total mass of magnesium (Mg), aluminum (Al) and chromium (Cr) contained in the color material liquid is more preferably 140 mass ppm or less, particularly preferably 60 mass ppm or less, based on the entire color material liquid. More preferably, it is 20 mass ppm or less.

The total mass of magnesium (Mg) and chromium (Cr) contained in the colorant liquid is preferably 200 mass ppm or less, more preferably 140 mass ppm or less, and 60 mass ppm or less. Is particularly preferable, and is more preferably 20 ppm by mass or less.
The effect of this invention mentioned above is especially show | played as it is below the said upper limit.

  “The total mass of calcium (Ca) and iron (Fe) contained in the color material solution” is less than or equal to the above upper limit, and “magnesium (Mg), aluminum (Al), and chromium (Cr) contained in the color material solution” If the total weight of the `` total mass '' is not more than the above upper limit, it can be dispersed more favorably even if the concentration of the colorant contained in the colorant liquid is increased, and the dispersion stability is maintained even better over time, and the high colorant concentration However, it is possible to obtain a color filter color material liquid that is less likely to deteriorate with time.

“The total mass of calcium (Ca) and iron (Fe) contained in the color material liquid” is not more than the above upper limit, and the calcium (Ca) is preferably not more than 160 mass ppm with respect to the whole color material liquid. 100 mass ppm or less is more preferred, 60 mass ppm or less is particularly preferred, and 30 mass ppm or less is even more preferred.
Further, “the total mass of calcium (Ca) and iron (Fe) contained in the color material liquid” is not more than the above upper limit, and iron (Fe) is 30 mass ppm or less with respect to the whole color material liquid. Is preferable, 20 mass ppm or less is more preferable, 10 mass ppm or less is particularly preferable, and 5 mass ppm or less is further preferable.
The effect of this invention mentioned above is especially show | played as it is below the said upper limit.

"The total mass of calcium (Ca) and iron (Fe) contained in the color material liquid" is less than or equal to the above upper limit, and "calcium (Ca), iron (Fe) and magnesium (Mg) contained in the color material liquid" , “Total mass of aluminum (Al) and chromium (Cr)” is preferably 290 mass ppm or less, more preferably 260 mass ppm or less, particularly preferably 190 mass ppm or less, and 100 mass with respect to the entire color material liquid. More preferred is ppm or less, and most preferred is 50 mass ppm or less.
The effect of this invention mentioned above is especially show | played as it is below the said upper limit.

Furthermore, “total mass of calcium (Ca), iron (Fe), magnesium (Mg), and chromium (Cr) contained in the color material liquid” is preferably 290 mass ppm or less with respect to the entire color material liquid, 260 mass ppm or less is more preferable, 190 mass ppm or less is particularly preferable, 100 mass ppm or less is further preferable, and 50 mass ppm or less is most preferable.
The effect of this invention mentioned above is especially show | played as it is below the said upper limit.

<Operation principle>
The principle of action that exhibits the effects of the present invention, such as improvement of dispersion stability, does not limit the scope of the invention, but is considered as follows.
That is, when calcium (Ca) or iron (Fe) or a large amount of the specific metal element is present in the vicinity of the coloring material, it is presumed that the adsorption of the dispersant to the coloring material is inhibited. In addition, it is estimated that the salt-type dispersant or acidic pigment derivative that contributes to improving the dispersibility forms a salt with the specific metal element, so that the dispersant or acidic pigment derivative cannot contribute to the improvement of the dispersibility. .

In addition, the above-described effect on the lowering of dispersibility is due to the presence of a divalent or higher cation such as a cation of a specific metal element rather than a monovalent cation such as sodium ion (Na ⁺ ) or potassium ion (K ⁺ ). There is a possibility that it is greater. Since the larger the valence of the metal cation, the higher the influence on the cohesion, “the upper limit of the total mass of Ca and Fe, both of which are metal elements having a valence of 2 or more, and furthermore, As a result of suppressing the “upper limit of the total mass of Mg, Al, and Cr, which are metal elements having a valence of 2 or more,” it is considered that “dispersion stability” is improved.
Further, it is more preferable to suppress the content of Fe, which is a metal element that gives a trivalent cation, and more preferably, Al, which is a metal element that also gives a trivalent cation, while suppressing the content of Fe. It is also considered that the suppression of the content of Cr and Cr greatly influenced the improvement of dispersion stability.

  Therefore, when the content of the specific metal element is small as defined in the present invention, the above-described obstacles are unlikely to occur, so that it is presumed that dispersibility and developability described later are improved.

<Method for reducing the content of the specific metal element in the colorant liquid>
The color material liquid in the present invention contains at least a color material and a solvent, and the specific metal element is brought in from a color material, a solvent, or the like that is a raw material of the color material liquid. Moreover, it can mix from the apparatus used for stirring, mixing, dispersion | distribution, etc. Therefore, it is preferable to prevent contamination of the metal from the raw materials and equipment.
In particular, since the amount of the specific metal element brought from the color material is large, it is more preferable to remove the specific metal element from the color material.
Furthermore, it is particularly preferable to reduce the amount of the specific metal element from the colorant to be blended and from the colorant including an acidic dye derivative.

  The method for removing the specific metal element in the color material is not particularly limited, and may be removed in the production process of the color material, or the specific metal element may be removed from the produced color material by a specific removal method. Also good.

Among the color materials, the dye production process, and the method for removing the specific metal element from the produced color material include a recrystallization method, a dialysis method, a salting-out method, an ion exchange resin method, column chromatography, and paper chromatography. Is mentioned. The recrystallization method is preferable from the viewpoint of cost.
Further, among the manufactured color materials, the method of removing the specific metal element from the pigment is preferably cleaning with a liquid such as alcohol or water. However, in terms of cost, a cleaning method using water (hereinafter simply abbreviated as “water washing”). May be particularly preferred).

In addition to the “washing with liquid” such as “washing with water”, the material of the manufacturing apparatus in the coloring material production process includes a metal containing iron such as iron and stainless steel; a chrome-plated member; It is preferable not to use those.
“Production device members” include balls in a ball mill, media such as beads in a bead mill; inner walls of color material production containers, dispersion containers, surface treatment containers, drying containers, filtration containers, etc .; crusher members; Member; etc. are mentioned.

  The removal method is particularly preferably washing with water. In the washing with water, the coloring material may be suspended in water and suspended by a batch method, or may be treated by a continuous method using running water.

The amount of the specific metal element contained in the color material used in the color material liquid in the present invention can be achieved by adjusting or optimizing the following.
That is, as a means for reducing the amount of the specific metal element contained in the coloring material, the content of the specific metal element contained in the washing water to be used is reduced (using demineralized water with a sufficiently reduced amount of the metal). ), The washing is performed by a continuous method using running water. If the washing is a batch method, the number of times of washing is increased. In either the continuous method or the batch method, the amount of washing water is increased with respect to the amount of coloring material. Increase the pH of the washing water, adjust the pH of the washing water, optimize the stirring device during washing, increase the washing time, and the like.

Among these, a batch method in which the number of times of washing is increased, a continuous method using running water, or a method of raising the temperature of the washing water is particularly preferable.
The temperature of the washing water is more preferably in the range of 20 ° C. to 80 ° C. from the viewpoint that the predetermined metal can be efficiently removed, particularly preferably in the range of 30 ° C. to 70 ° C., and further preferably in the range of 40 ° C. to 60 ° C. .
Among them, a continuous method using running water is suitable. In this case, the amount of running water is preferably 30 parts by mass to 40,000 parts by mass, and 40 parts by mass to 20000 parts by mass with respect to 1 part by mass of the coloring material. More preferably, 50 parts by mass to 10000 parts by mass are particularly preferable, and 60 parts by mass to 5000 parts by mass are even more preferable.

  Deionized water used for washing is prepared by treating raw water with a treatment agent such as strong acid or weak acid cation exchange resin, strong base or weak base anion exchange resin, ion exchange membrane, chelate resin, activated carbon, and antibacterial activated carbon. At least one selected from the above, preferably a combination of two or more of the above-mentioned treatment agents, or (distillation under reduced pressure) is preferable.

  Washing with water is not particularly limited, but the color material produced by a known method is suspended in the deionized water, and a vacuum filter, belt press, centrifuge, Nutsche funnel, etc. Using continuous method of supplying deionized water continuously and washing continuously, filter press, homogenizer (high pressure or low pressure homogenizer, ultrasonic homogenizer, etc.), sand mill, ball mill, roll mill, magnetic stirrer, etc. A batch method in which the color material is washed while being dispersed is preferred.

  Above all, in order to reduce the mixing of metals such as calcium (Ca), iron (Fe), magnesium (Mg), aluminum (Al), chromium (Cr), etc. A homogenizer such as a sonic homogenizer is more preferable, and an ultrasonic homogenizer is particularly preferable from the viewpoint of reducing the amount of the specific metal element mixed in and reducing costs.

  Moreover, when washing | cleaning, disperse | distributing a coloring material using the said stirrer, it is also preferable to supply water continuously and to process by a continuous method using flowing water. That is, it is also preferable to use a combination of the stirrer and the continuous method in order to reduce the specific metal element.

During the washing step, impurities such as metal salts, free metals, and other inorganic salts in the colorant are extracted from the deionized water. After washing, the suspension is filtered to remove impurities extracted into deionized water as a filtrate.
Next, the coloring material wet cake obtained above is suspended again in deionized water, and if necessary, washing treatment is performed several times in the same process as above, each time, impurities are removed as a filtrate, It is preferable to dry the color material wet cake finally obtained to obtain a color material for blending in the color material liquid. From the balance between the cleaning effect and the cost, the “several times” is preferably 2 to 50 times, more preferably 3 to 40 times, particularly preferably 4 to 30 times, and still more preferably 5 to 20 times. The (especially) preferable mass of the total deionized water used with respect to 1 mass part of coloring material is the same as that of the case of the above-mentioned "continuous method using flowing water".

  That is, a preferred embodiment of washing with water uses a stirrer such as “high-pressure or low-pressure homogenizer, sand mill, ball mill, roll mill, magnetic stirrer, etc.” to wash the coloring material in a batch method or a continuous method while dispersing the coloring material in water. Then, after filtration, it is suspended in fresh water and washed with water. In the case of a batch method, the above steps are repeated a plurality of times, filtered and dried.

Further, the electric conductivity of the final filtrate in the washing step is preferably 20 μS / cm or less (particularly preferably 0.05 μS / cm to 5 μS / cm). If the above electrical conductivity exceeds the above range, the coloring material may be insufficiently washed, and a coloring material liquid in which the amount of the specific metal element described above is reduced within the scope of the present invention may not be obtained. .
That is, it is obtained by using the coloring material by repeating the washing treatment to a level comparable to the electric conductivity of deionized water used for washing the coloring material, and bringing the impurities in the coloring material close to zero. The color material liquid exhibits the effects of the present invention described above.

  In addition, the final washing step for the color material used for the preparation of the color material solution in the present invention can be confirmed by ICP (Inductively Coupled Plasma) emission spectroscopic analysis of the filtrate. The ICP measurement of the filtrate is carried out in the same manner as described in the measurement example <quantitative determination of metal in the colorant solution> in the examples, except that the "colorant solution" in the measurement example is replaced with the "filtrate".

The content in the final filtrate of the washing step is preferably such that both calcium (Ca) and iron (Fe) are below the detection limit, calcium (Ca), iron (Fe), magnesium (Mg), It is more preferable that both aluminum (Al) and chromium (Cr) are below the detection limit, and calcium (Ca), iron (Fe), magnesium (Mg), aluminum (Al), chromium (Cr), sodium ( It is particularly preferred that both Na) and potassium (K) are below the detection limit.
Here, the detection limit in the measuring method of the present invention (ICP (Inductively Coupled Plasma) emission spectroscopic analysis) is less than 0.01 ppm.

When the “content by ICP measurement” or “electric conductivity of the filtrate” of each metal atom that is an impurity in the filtrate exceeds the above upper limit, the content of the predetermined metal in the colorant liquid is Since it may not fall within the scope of the present invention described above, a color material liquid having a high color material concentration may not be prepared with a low viscosity (optimum viscosity) or dispersion stability may not be achieved.
For this reason, it is preferable to repeat the washing process until the content of the specific metal element in the filtrate and the electrical conductivity of the filtrate fall within the above numerical ranges when the color material is prepared.

<Aspect of colorant dispersion>
The average dispersed particle diameter of the color material in the color material dispersion in the present invention is not particularly limited, but is preferably 8 nm to 150 nm, more preferably 10 nm to 100 nm, and particularly preferably 12 nm to 70 nm.
Here, the average dispersed particle diameter of the color material in the color material dispersion liquid (hereinafter sometimes simply referred to as “average dispersed particle diameter”) is a color material dispersed in a dispersion medium containing at least a solvent. The dispersed particle diameter of the particles is measured by a laser light scattering particle size distribution meter. For measuring the particle size with a laser light scattering particle size distribution meter, the color material dispersion is appropriately diluted to a concentration that can be measured with a laser light scattering particle size distribution meter with a solvent used in the color material dispersion (for example, 1000 , Etc.) and a laser light scattering particle size distribution meter (for example, Nanotrack particle size distribution measuring device UPA-EX150 manufactured by Nikkiso Co., Ltd.) is measured at 23 ° C. by a dynamic light scattering method. The average dispersed particle size here is a volume average particle size.

  If the average dispersed particle size is too small, the light resistance may decrease. On the other hand, if the average dispersed particle size is too large, the display using the color filter obtained by using the colorant dispersion has a contrast. It may be low, the light transmittance may be low, or the display may not be high brightness.

  After the dispersion, it is preferably filtered through a filter of 0.05 μm to 10 μm, preferably 0.1 μm to 5 μm, etc. to obtain the color material dispersion in the present invention.

<Coloring composition for color filter>
The color material liquid in the present invention can be suitably used for a color filter material, a color filter coloring composition, a color filter coloring composition, a liquid crystal display material, an organic EL display material, and the like. In particular, it is useful as a coloring composition for a color filter.
And the coloring composition for color filters of this invention is a coloring composition containing a coloring material, a polymerization initiator, and an alkali-soluble resin, Comprising: Of calcium (Ca) and iron (Fe) contained in this coloring composition The coloring composition for color filters, wherein the total mass is 120 mass ppm or less with respect to the whole coloring composition, and contains two or more solvents.
By using the above-mentioned color material liquid, it is easy to prepare a colored composition for a color filter in a range where the total mass of calcium (Ca) and iron (Fe) is required.
The alkali-soluble resin has a polymerizable functional group, and only the polymerizable functional group of the alkali-soluble resin may be polymerized, but the color filter coloring composition further contains a polymerizable polyfunctional compound. It is also preferable.

The colored composition for a color filter of the present invention may further contain other components as necessary as long as the effects of the present invention are not impaired.
Hereinafter, each component of the coloring composition for a color filter of the present invention will be described in detail in order, but the same coloring material and solvent as those of the coloring material dispersion according to the present invention should be used. Therefore, the description here is omitted.

<< Alkali-soluble resin >>
The alkali-soluble resin is not particularly limited, and any resin that can be suitably developed with an alkaline developer can be used.
The alkali-soluble resin is preferably a copolymer having an acid group-containing monomer as a copolymerization component. Moreover, what introduce | transduced the acid group into the polymer later may be used.

  Here, as a monomer having an acid group, a monomer having a carboxy group such as (meth) acrylic acid or itaconic acid (methylene succinic acid); a monomer having a phenolic hydroxyl group such as 4-hydroxyphenylmaleimide; maleic anhydride, Monomers having a carboxylic anhydride group such as itaconic anhydride; and the like.

In addition, the alkali-soluble resin in the present invention has a radically polymerizable double bond introduced, the sensitivity is improved, the colored composition is image-exposed and photocured, and the unexposed part is developed, resulting in a strong From the point etc. which can form a simple coating film.
In order to introduce a radical polymerizable double bond, for example, a monomer capable of introducing a radical polymerizable double bond after polymerization is (co) polymerized, and then a radical polymerizable double bond as described later is introduced into the side chain. To do.
Examples of the “monomer capable of introducing a radically polymerizable double bond after polymerization” include, for example, monomers having a carboxy group such as (meth) acrylic acid and itaconic acid; carboxylic acid anhydrides such as maleic anhydride and itaconic anhydride Monomer having a group; and the like.

Examples of the compound used for introducing the radical polymerizable double bond include “epoxy group” such as glycidyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, o- or m- or p-vinylbenzylglycidyl ether. And a radically polymerizable double bond ”.
A radical polymerizable double bond is introduced by reacting an epoxy group of a compound having “epoxy group and radical polymerizable double bond” with an acid group of “monomer capable of introducing a radical polymerizable double bond after polymerization”. The obtained alkali-soluble resin is obtained.

  In addition to the above, monomers that can be copolymerized with these can be used for the alkali-soluble resin. As the monomer (hereinafter abbreviated as “other monomer”), an ethylenically unsaturated double bond is used. Specific examples include styrene monomers such as styrene and α-methylstyrene; methyl (meth) acrylate, ethyl (meth) acrylate (n-propyl acrylate), (meth) (Meth) such as isopropyl acrylate, butyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, glycidyl (meth) acrylate, benzyl (meth) acrylate, hydroxyethyl (meth) acrylate, etc. Acrylic ester monomers; (meth) acrylamide, N-methylolacrylamide, (Meth) acrylamide monomers such as N, N-dimethylacrylamide and N, N-dimethylaminoethylacrylamide; vinyl acetate; acrylonitrile; allyl group-containing compounds such as allyl alkyl ether; maleimide monomers such as benzylmaleimide and N-phenylmaleimide And the like are copolymerized.

  The “monomer having an acid group”, “monomer capable of introducing a radical polymerizable double bond after polymerization”, “compound used for introducing a radical polymerizable double bond” and “other monomer” are used. In some cases, one type or two or more types are used, respectively, and are subjected to (co) polymerization or reaction.

The acid value of the alkali-soluble resin in the present invention is not particularly limited, but is preferably 30 to 200 mgKOH / g, more preferably 40 to 150 mgKOH / g, and particularly preferably 50 to 120 mgKOH / g.
When the upper limit of the acid value is not more than the above value, sufficient adhesion to the substrate can be obtained, and when the lower limit is not less than the above value, sufficient alkali developability can be obtained.

Although the molecular weight of alkali-soluble resin in this invention does not have limitation in particular, As a weight average molecular weight (Mw) of polystyrene conversion, it is 3000-25000 normally, Preferably, it is 4000-20000, Most preferably, it is 5000-15000.
When the upper limit of the weight average molecular weight (Mw) is not more than the above value, compatibility with other components is improved, developability is improved, and viscosity is not excessively increased. On the other hand, when the lower limit is not less than the above value, the adhesion with the substrate is improved.

The alkali-soluble resin preferably further has a hydrocarbon ring from the viewpoint of excellent adhesion of the colored layer. By having a hydrocarbon ring that is a bulky group in the alkali-soluble resin, shrinkage during curing is suppressed, peeling from the substrate is eased, and substrate adhesion is improved. Further, the present inventors have found that the use of an alkali-soluble resin having a hydrocarbon ring suppresses the solvent resistance of the obtained colored layer, particularly the swelling of the colored layer. Although the action is unclear, the bulky hydrocarbon ring in the colored layer suppresses the movement of molecules in the colored layer, resulting in an increase in the strength of the coating and suppression of swelling by the solvent. It is estimated that.
Examples of such a hydrocarbon ring include a cyclic aliphatic hydrocarbon ring which may have a substituent, an aromatic ring which may have a substituent, and combinations thereof. May have a substituent such as a carbonyl group, a carboxyl group, an oxycarbonyl group or an amide group.

  Specific examples of the hydrocarbon ring include aliphatic hydrocarbons such as cyclopropane, cyclobutane, cyclopentane, cyclohexane, norbornane, tricyclo [5.2.1.0 (2,6)] decane (dicyclopentane), and adamantane. Rings: aromatic rings such as benzene, naphthalene, anthracene, phenanthrene, fluorene, etc .; chain polycycles such as biphenyl, terphenyl, diphenylmethane, triphenylmethane, stilbene, and cardo structures represented by the following general formula (5) Can be mentioned.

When an aliphatic ring is included as the hydrocarbon ring, it is preferable from the viewpoint of improving the heat resistance and adhesion of the colored layer and improving the luminance of the obtained colored layer.
Moreover, when including the cardo structure shown by the said General formula (5), the sclerosis | hardenability of a colored layer improves and it is especially preferable from the point which improves solvent resistance (NMP swelling suppression).

The alkali-soluble resin preferably has a crosslinked cyclic aliphatic group, which is an aliphatic group having a structure in which two or more rings share two or more atoms.
Specific examples of the bridged cycloaliphatic group include norbornyl group, isobornyl group, adamantyl group, tricyclodecyl group, dicyclopentenyl group, dicyclopentanyl group, tricyclopentenyl group, tricyclopentanyl group, tricyclo group. Pentadiene group, dicyclopentadiene group; a group in which a part of these groups is substituted with a substituent.
Examples of the substituent include an alkyl group, a cycloalkyl group, an alkylcycloalkyl group, a hydroxyl group, a ketone group, a nitro group, an amine group, and a halogen atom.

  From the viewpoints of compatibility with other materials and solubility in an alkali developer, the lower limit of the number of carbon atoms in the crosslinked cycloaliphatic group is preferably 5 or more, and particularly preferably 7 or more. The upper limit is preferably 12 or less, and particularly preferably 10 or less.

  The alkali-soluble resin preferably has a maleimide structure represented by the following general formula (6).

［一般式（６）において、Ｒ^Ｍは、置換されていてもよい環状構造を有する炭化水素基である。］

[In General Formula (6), R ^M represents a hydrocarbon group having an optionally substituted cyclic structure. ]

  When the alkali-soluble resin has a maleimide structure represented by the general formula (6), since the hydrocarbon ring has a nitrogen atom, the compatibility with the basic block type dispersant and the basic graft type dispersant described above is very high. The development speed is fast and the development residue tends to be small.

In General Formula (6), examples of ^RM include an optionally substituted aliphatic hydrocarbon group and an optionally substituted aromatic hydrocarbon group.
Examples of the former include a cyclopentyl group, a cyclohexyl group, and a cyclooctyl group.
Examples of the latter include phenyl group, methylphenyl group, ethylphenyl group, dimethylphenyl group, diethylphenyl group, methoxyphenyl group, benzyl group, hydroxyphenyl group, naphthyl group and the like.

  Moreover, it is especially preferable that the alkali-soluble resin has both a maleimide structure represented by the general formula (6) and a hydrocarbon ring from the viewpoint of reducing development residues.

  In the case of an alkali-soluble resin containing an aliphatic ring, if the developing speed is moderate, the compatible dispersant and colorant are developed together, so that development residue tends to be reduced.

In the alkali-soluble resin used in the present invention, it is easy to adjust the amount of each constituent unit by using an acrylic copolymer having a constituent unit having a hydrocarbon ring separately from the constituent unit having a carboxyl group. This is preferable because the amount of the structural unit having a hydrocarbon ring is increased to easily improve the function of the structural unit.
An acrylic copolymer having a carboxyl-containing structural unit and the hydrocarbon ring is prepared by using an ethylenically unsaturated monomer having a hydrocarbon ring as the aforementioned “other copolymerizable monomer”. Can do.
Examples of the ethylenically unsaturated monomer having a hydrocarbon ring include cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, adamantyl (meth) acrylate, isobornyl (meth) acrylate, benzyl (meth) acrylate, and phenoxyethyl. (Meth) acrylate, styrene, N-phenylmaleimide, N-benzylmaleimide, N-cyclohexylmaleimide and the like are mentioned, and phenoxyethyl (meth) acrylate, cyclohexyl (meth) acrylate, and dicyclo are excellent in the effect of suppressing water stain. Pentanyl (meth) acrylate, adamantyl (meth) acrylate, benzyl (meth) acrylate, styrene, and N-phenylmaleimide are preferable, and styrene is particularly preferable.

When the alkali-soluble resin in the coloring composition has a hydrocarbon ring, the alkali-soluble resin contains two or more structural units having a hydrocarbon ring (hereinafter sometimes referred to as “hydrocarbon-containing structural units”). If it is, development residue is particularly reduced, and the occurrence of water stain can be particularly suppressed.
“In the alkali-soluble resin, two or more structural units having a hydrocarbon ring are contained” means that two or more types of an alkali-soluble resin having two or more hydrocarbon-containing structural units are contained in the coloring composition. Any of the above-described alkali-soluble resins having a hydrocarbon ring (of which at least two types of alkali-soluble resins have different structural units) may be contained in the coloring composition. A plurality of alkali-soluble resins having two or more hydrocarbon-containing structural units may be used in combination.

<< Polymerizable polyfunctional compound >>
There is no limitation in particular as a polymerizable polyfunctional compound, A well-known polymerizable polyfunctional compound is used.
The “polymerizable polyfunctional compound” is not particularly limited as long as it has two or more polymerizable functional groups in one molecule. For example, polyester (meth) acrylate, polyether (meth) acrylate, urethane And polyfunctional (meth) acrylates such as (meth) acrylate and epoxy (meth) acrylate; polyfunctional allyl compounds such as diallyl phthalate and triallyl isocyanurate;

Among these, specific examples of the polyether (meth) acrylate include the following.
Examples of the bifunctional (meth) acrylate include linear alkanediol di (meth) acrylates such as 1,4-butanediol di (meth) acrylate and 1,6-hexanediol di (meth) acrylate; diethylene glycol di (meth) ) Acrylate, polyethylene glycol # 200 di (meth) acrylate, dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, polypropylene glycol # 400 di (meth) acrylate; pentaerythritol di (meth) acrylate, etc. Trivalent or higher alcohol partial (meth) acrylic acid ester; bisphenol-based di (meth) acrylates such as bisphenol A di (meth) acrylate and bisphenol F di (meth) acrylate; neopentyl Rikoruji (meth) acrylate; and the like.

  Examples of the trifunctional (meth) acrylate include glycerin tri (meth) acrylate, glycerin PO-modified tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane EO-modified tri (meth) acrylate, and trimethylolpropane. PO-modified tri (meth) acrylate, isocyanuric acid EO-modified tri (meth) acrylate, isocyanuric acid EO-modified ε-caprolactone-modified tri (meth) acrylate, 1,3,5-triacryloylhexahydro-s-triazine, pentaerythritol tri (Meth) acrylate, dipentaerythritol tri (meth) acrylate tripropionate, etc. are mentioned.

  Examples of tetrafunctional or higher functional (meth) acrylates include pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, succinic acid-modified dipentaerythritol penta (meth) acrylate, and pentaerythritol tri (meth) acrylate. Examples include succinic acid-modified products, dipentaerythritol penta (meth) acrylate monopropionate, dipentaerythritol hexa (meth) acrylate, tetramethylolethane tetra (meth) acrylate, oligoester tetra (meth) acrylate and the like.

  These polyfunctional monomers may be used individually by 1 type, and may be used in combination of 2 or more type. For example, a polyfunctional monomer having a carboxy group and a polyfunctional monomer having no carboxy group may be used in combination. From the point of improving heat resistance and adhesion, succinic acid modification of pentaerythritol tri (meth) acrylate having carboxy group, succinic acid modification of dipentaerythritol penta (meth) acrylate having carboxy group A thing etc. are preferable.

<< Polymerization initiator >>
Examples of the polymerization initiator include a thermal polymerization initiator and a photopolymerization initiator.
There is no limitation in particular as a photoinitiator, The well-known thing conventionally used with respect to radical polymerization can be used. In particular, it is preferable to use what is generally used for manufacturing color filters.

  As such a photopolymerization initiator, specifically, a compound that generates free radicals by the energy of ultraviolet rays, which is a benzoin derivative; a benzophenone derivative; Irgacure OX-01, Irgacure OXE-02 (manufactured by BASF Japan); oxime ester compounds such as ADEKA OPT-N-1919 (manufactured by Asahi Denka); chlorosulfonyl, chloromethyl polynuclear aromatic compounds, chloromethyl heterocycle Formula compounds, halogen-containing compounds such as chloromethylbenzophenones; triazines; fluorenones; haloalkanes; redox couples of photoreducing dyes and reducing agents; organic sulfur compounds; peroxides; It is below.

  Specific examples of the photopolymerization initiator include aromatic ketone compounds such as Michler's ketone, 4,4′-bisdiethylaminobenzophenone, 4-methoxy-4′-dimethylaminobenzophenone, 2-ethylanthraquinone, and phenanthrene; Benzoin ether compounds such as methyl ether, benzoin ethyl ether, and benzoin phenyl ether; Benzoin compounds such as methyl benzoin and ethyl benzoin; 2- (o-chlorophenyl) -4,5-phenylimidazole dimer, 2- (o-chlorophenyl) ) -4,5-di (m-methoxyphenyl) imidazole dimer, 2- (o-fluorophenyl) -4,5-diphenylimidazole dimer, 2- (o-methoxyphenyl) -4,5- Diphenylimidazole dimer, 2, , 5-triarylimidazole dimers, biimidazole compounds such as 2- (o-chlorophenyl) -4,5-di (m-methylphenyl) imidazole dimer; 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone, 2-trichloromethyl-5-styryl-1,3,4-oxadiazole, 2-trichloromethyl-5- (p-cyanostyryl) -1,3,4-oxa Halomethylthiazole compounds such as diazole and 2-trichloromethyl-5- (p-methoxystyryl) -1,3,4-oxadiazole; 2,4-bis (trichloromethyl) -6-p-methoxystyryl- s-triazine, 2,4-bis (trichloromethyl) -6- (1-p-dimethylaminophenyl-1,3-butadienyl) -s-triazine 2-trichloromethyl-4-amino-6-p-methoxystyryl-s-triazine, 2- (naphth-1-yl) -4,6-bis-trichloromethyl-s-triazine, 2- (4-ethoxy- Halomethyl such as naphth-1-yl) -4,6-bis-trichloromethyl-s-triazine, 2- (4-butoxy-naphth-1-yl) -4,6-bis-trichloromethyl-s-triazine, etc. s-triazine compounds; 2,2-dimethoxy-1,2-diphenylethane-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropanone, 1,2-benzyl- 2-dimethylamino-1- (4-morpholinophenyl) -butanone-1,1-hydroxy-cyclohexyl-phenyl ketone, methyl benzoylbenzoate, 4-benzo Yl-4′-methyldiphenyl sulfide, benzylmethyl ketal, dimethylaminobenzoate, isoamyl p-dimethylaminobenzoate, 2-n-butoxyethyl-4-dimethylaminobenzoate, 2-chlorothioxanthone, 2,4-diethylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, ethanone, 1- [9-ethyl-6- (2-methylbenzoyl) -9H-carbazol-3-yl] -1- (o-acetyloxime), 4-benzoyl- Methyldiphenyl sulfide, 1-hydroxy-cyclohexyl-phenyl ketone, 2-benzyl-2- (dimethylamino) -1- [4- (4-morpholinyl) phenyl] -1-butanone, 2- (dimethylamino)- 2-[(4-methylpheny ) Methyl] -1- [4- (4-morpholinyl) phenyl] -1-butanone, α-dimethoxy-α-phenylacetophenone, phenylbis (2,4,6-trimethylbenzoyl) phosphine oxide, 2-methyl- 1- [4- (methylthio) phenyl] -2- (4-morpholinyl) -1-propanone, 1,2-octadione and the like can be mentioned.

Moreover, the photoinitiator which has a tertiary amine structure can be used suitably. Since the photopolymerization initiator having a tertiary amine structure has a tertiary amine structure that is an oxygen quencher in the molecule, radicals generated from the photopolymerization initiator are not easily deactivated by oxygen, and sensitivity can be improved. It has the advantage that it can.
As a commercial item of the photoinitiator which has the said tertiary amine structure, Irgacure 907, Irgacure 369 (above, BASF Japan make), high cure ABP (made by Kawaguchi Pharmaceutical Co., Ltd.), etc. are mentioned, for example.

<<< Oxime ester photoinitiator >>>
The colored composition for a color filter of the present invention preferably contains an oxime ester photopolymerization initiator.
When an oxime ester photopolymerization initiator is used in preparing a color filter coloring composition, the sensitivity (remaining film ratio) of the coloring composition is improved.

  The oxime ester photopolymerization initiators are disclosed in JP 2000-80068 A, JP 2001-233842 A, JP 2010-527339, JP 2010-527338, JP 2013-041153, and International Publication No. 2015/036910. Etc. can be suitably selected from the compounds described in the above.

Commercially available oxime ester photopolymerization initiators include Irgacure OXE-01, Irgacure OXE-02, Irgacure OXE-03, Irgacure OXE-04 (above, manufactured by BASF), ADEKA OPT-N-1919, Adeka Arcles NCI-930, Adeka Arcles NCI-831 (manufactured by ADEKA), TR-PBG-304, TR-PBG-326, TR-PBG-3057 (manufactured by Changzhou Power Electronics New Materials Co., Ltd.) .
Of these, Irgacure OXE-03, Irgacure OXE-04, ADEKA OPT-N-1919, Adeka Arcles NCI-930, Adeka Arcles NCI-831, and TR-PBG-304 are particularly preferred because of their high sensitivity.

Specific compound names of the oxime ester photopolymerization initiator include the following compounds, that is, compounds of the following formulas (A1) and (B1) to (B7).

  An oxime ester photoinitiator may be used independently and may be used in combination of 2 or more type.

<<< Other Photopolymerization Initiators >>>
In addition to the oxime ester photopolymerization initiator, the coloring composition for a color filter of the present invention further comprises an α-aminoketone photopolymerization initiator, a biimidazole photopolymerization initiator, a thioxanthone photopolymerization initiator, an acyl phosphine. A fin oxide photopolymerization initiator and the like may be contained.

α-Aminoketone-based photopolymerization initiator has the property of curing the middle from the surface of the coating film, and it is easy to suppress deep film curability, so when combined with the oxime ester-based photopolymerization initiator, coating film deep curing It is preferable because it has a high tendency to improve the property.
Examples of the α-aminoketone photopolymerization initiator include 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropan-1-one (for example, Irgacure 907, manufactured by BASF), 2-benzyl-2. -(Dimethylamino) -1- (4-morpholinophenyl) -1-butanone (eg Irgacure 369, manufactured by BASF), 2- (dimethylamino) -2-[(4-methylphenyl) methyl] -1- [4- (4-morpholinyl) phenyl] -1-butanone (Irgacure 379EG, manufactured by BASF) and the like.
The α-aminoketone photopolymerization initiator may be used alone or in combination of two or more, among which 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropan-1-one, and 2-benzyl-2- (dimethylamino) -1- (4-morpholinophenyl) -1-butanone is preferably used in combination because the remaining film ratio is improved.

The biimidazole photopolymerization initiator has the property of curing the deep part of the coating film, easily suppresses the coating surface curability, and when combined with the compound represented by the oxime ester photopolymerization initiator, the coating film surface It is preferable from the viewpoint of high tendency to improve curability.
Examples of the biimidazole photopolymerization initiator include 2,2′-bis (2-chlorophenyl) -4,4 ′, 5,5′-tetrakis (4-ethoxycarbonylphenyl) -1,2′-biimidazole. 2,2′-bis (2-bromophenyl) -4,4 ′, 5,5′-tetrakis (4-ethoxycarbonylphenyl) -1,2′-biimidazole, 2,2′-bis (2- Chlorophenyl) -4,4 ′, 5,5′-tetraphenyl-1,2′-biimidazole, 2,2′-bis (2,4-dichlorophenyl) -4,4 ′, 5,5′-tetraphenyl -1,2'-biimidazole, 2,2'-bis (2,4,6-trichlorophenyl) -4,4 ', 5,5'-tetraphenyl-1,2'-biimidazole, 2,2 '-Bis (2-bromophenyl) -4,4', 5,5'-tetraphenyl 1,2′-biimidazole, 2,2′-bis (2,4-dibromophenyl) -4,4 ′, 5,5′-tetraphenyl-1,2′-biimidazole, 2,2′-bis And (2,4,6-tribromophenyl) -4,4 ′, 5,5′-tetraphenyl-1,2′-biimidazole.
As a biimidazole type photoinitiator, you may use individually or in combination of 2 or more types, and it is preferable to use it in combination with the mercapto compound mentioned later especially from the point which coating-film hardenability improves.
In addition, it is preferable to use a combination of a biimidazole photopolymerization initiator and the α-aminoketone photopolymerization initiator in combination with the oxime ester photopolymerization initiator from the viewpoint of improving the remaining film rate and linearity.
“Improved linearity” means that the color layer formed in the development step after applying the coloring composition has few irregularities at the end of the colored layer and is formed in a linear shape.

Examples of the thioxanthone photopolymerization initiator include 2,4-isopropylthioxanthone, 2,4-diethylthioxanthone, 1-chloro-4-propoxythioxanthone, 2,4-dichlorothioxanthone, and the like.
The thioxanthone-based photopolymerization initiator may be used alone or in combination of two or more. Among them, the use of 2,4-isopropylthioxanthone or 2,4-diethylthioxanthone improves the radical generation transfer. To preferred.
Moreover, it is preferable to use the oxime ester photopolymerization initiator in combination with a thioxanthone photopolymerization initiator and the α-aminoketone photopolymerization initiator because the remaining film ratio is improved.

Although the acylphosphine oxide photopolymerization initiator has the property of being less susceptible to yellowing due to heat, the sensitivity is generally low and sufficient curability may not be obtained, but the oxime ester photopolymerization initiator Is preferable because it tends to improve overall coating curability.
Examples of the acylphosphine oxide photopolymerization initiator include benzoyl-diphenylphosphine oxide, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2,3,5,6-tetramethylbenzoyl-diphenylphosphine oxide, 3 , 4-Dimethylbenzoyl-diphenylphosphine oxide, 2,4,6-trimethylbenzoyl-phenylethoxyphosphine oxide, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, bis (2,6-dimethoxybenzoyl)- Examples include 2,4,4-trimethyl-pentylphosphine oxide, bis (2,6-dimethylbenzoyl) -ethylphosphine oxide, and the like.
The acylphosphine oxide photopolymerization initiator may be used alone or in combination of two or more. Among them, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide may be used to cure the coating film. It is preferable from the viewpoint of improving the properties.

<<< mercapto compound >>>
The colored composition of the present invention preferably contains a mercapto compound. Since the mercapto compound has the property of receiving radicals from slow-reacting radicals and accelerating the reaction, it can accelerate the coating surface hardening and suppress the occurrence of water stains.
The water stain refers to this phenomenon in which a trace of water stain is generated after rinsing with pure water after alkali development. Such water stain disappears after post-baking, so there is no problem as a product, but it is detected as unevenness in the appearance inspection of the patterning surface after development, and there is a problem that it is impossible to distinguish between normal products and abnormal products. Arise. Therefore, if the inspection sensitivity of the inspection apparatus is lowered in the appearance inspection, the yield of the final color filter product is lowered as a result, which becomes a problem.

  Examples of mercapto compounds include 2-mercaptobenzothiazole, 2-mercaptobenzoxazole, 2-mercaptobenzimidazole, 2-mercapto-5-methoxybenzothiazole, 2-mercapto-5-methoxybenzimidazole, and 3-mercaptopropionic acid. Methyl 3-mercaptopropionate, ethyl 3-mercaptopropionate, octyl 3-mercaptopropionate, 1,4-bis (3-mercaptobutyryloxy) butane, 1,3,5-tris (3-mercaptobutyloxy Ethyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H) -trione, trimethylolpropane tris (3-mercaptopropionate), pentaerythritol tetrakis (3-mercaptobutyrate), Pentaeri Lithol tetrakis (3-mercaptopropionate), dipentaerythritol hexakis (3-mercaptopropionate), and tetraethylene glycol bis (3-mercaptopropionate) and the like.

In particular, a polyfunctional mercapto compound having two or more mercapto groups (—SH groups) in one molecule has a high crosslinking density and is extremely excellent in the effect of suppressing water stain.
Specific examples of the polyfunctional mercapto compound include 1,4-bis (3-mercaptobutyryloxy) butane, 1,3,5-tris (3-mercaptobutyloxyethyl) -1,3,5-triazine-2. , 4,6 (1H, 3H, 5H) -trione, trimethylolpropane tris (3-mercaptopropionate), pentaerythritol tetrakis (3-mercaptobutyrate), pentaerythritol tetrakis (3-mercaptopropionate), Examples include dipentaerythritol hexakis (3-mercaptopropionate) and tetraethylene glycol bis (3-mercaptopropionate).

  In addition, a secondary mercapto compound having a secondary mercapto group in which the carbon atom to which the mercapto group is bonded is a secondary carbon atom is preferable from the viewpoint that even when stored for a long period of time, a good water stain suppression effect is easily maintained. Furthermore, a polyfunctional secondary mercapto compound having two or more secondary mercapto groups in one molecule is more preferable.

  By containing an alkali-soluble resin having a hydrocarbon ring in the color filter coloring composition and further using a mercapto compound in combination, the effect of suppressing the occurrence of water stain is synergistically extremely excellent.

A mercapto compound may be used individually by 1 type, and may be used in combination of 2 or more type.
When two or more types are used in combination, a polyfunctional mercapto compound and / or a secondary mercapto compound is preferably contained therein, and a polyfunctional secondary mercapto compound is particularly preferably contained therein.

In the colored composition for a color filter of the present invention, the total content of mercapto compounds is not particularly limited as long as the effects of the present invention are not impaired, but is preferably based on the total solid content of the colored composition for a color filter. It is in the range of 0.2% to 7% by mass, more preferably 0.5% to 5% by mass.
Within the above range, the occurrence of water stain can be effectively suppressed.

The total content of the photopolymerization initiator used in the color composition for color filter of the present invention is not particularly limited as long as the effects of the present invention are not impaired, but with respect to the total solid content of the color filter color composition. Preferably, it is in the range of 0.1 to 16.0% by weight, more preferably 1.0 to 12.0% by weight. If this content is less than the above lower limit, photocuring will not proceed sufficiently, and the exposed part may be eluted during development, and the effects of the present invention may be impaired. In some cases, the yellowing of the layer becomes strong and the luminance decreases.
In addition, in this invention, solid content is all things other than the solvent mentioned above, and a liquid polyfunctional monomer etc. are also contained.

  The content of the oxime ester photopolymerization initiator used in the colored composition for a color filter of the present invention is preferably 0.1% by mass or more and 8.0% by mass or less based on the total solid content of the colored composition. More preferably, it is in the range of 0.5 mass% or more and 6.0 mass% or less. If the content is less than the lower limit, the effect of the present invention may be impaired. On the other hand, if the content is higher than the upper limit, the yellowing of the resulting colored layer may become strong and the luminance may decrease.

When the oxime ester photopolymerization initiator and other photopolymerization initiator are used in combination as the photopolymerization initiator used in the present invention, the content of the oxime ester photopolymerization initiator is the coloring composition of the present invention. It is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, still more preferably 20 parts by mass or more, and 30 parts by mass in a total of 100 parts by mass of the photopolymerization initiator used for the product. More preferably, it is at least part.
On the other hand, the content of the oxime ester photopolymerization initiator is 100 parts by mass in total of the photopolymerization initiator used in the colored composition of the present invention, from the viewpoint of sufficiently exerting the combined effect with other photopolymerization initiators. The content is preferably 90 parts by mass or less, and more preferably 80 parts by mass or less.

  The photopolymerization initiator used in the present invention is at least one selected from an α-aminoketone photoinitiator, a biimidazole photopolymerization initiator, a thioxanthone photopolymerization initiator, and an acylphosphine oxide photopolymerization initiator. When the seed is contained, the total content thereof is preferably 0.4% by mass or more and 4.0% by mass or less, more preferably 0.6% by mass or more and 3.3% by mass or less based on the total solid content of the coloring composition. It is in the range of 0% by mass or less.

  As a photopolymerization initiator used in the present invention, when combining an α-aminoketone photopolymerization initiator with a biimidazole photopolymerization agent and / or a thioxanthone photopolymerization initiator, an α-aminoketone photopolymerization initiator and The ratio of the biimidazole photopolymerization initiator and / or the thioxanthone photopolymerization initiator is 100 parts by mass of the α-aminoketone photopolymerization initiator and the biimidazole photopolymerization initiator and / or the thioxanthone photopolymer. The polymerization initiator is preferably 5 parts by weight or more and 60 parts by weight or less, and more preferably 10 parts by weight or more and 40 parts by weight or less from the viewpoint of achieving both coating film curability and pattern shape.

  The photoinitiator used for this invention is not limited to 1 type, You may use combining 2 or more types.

<< content ratio >>
The content ratio of the alkali-soluble resin and the polymerizable polyfunctional compound in the colored composition of the present invention is not particularly limited, but polymerization is performed with respect to 100 parts by mass of the alkali-soluble resin from the viewpoint of sensitivity, resolution, and developability. The functional polyfunctional compound is preferably 0 to 500 parts by mass, more preferably 10 to 300 parts by mass, and particularly preferably 20 to 200 parts by mass.
5-80 mass% is preferable with respect to solid content total amount of a coloring composition, and 10-40 mass% is more preferable. Moreover, 5-60 mass% is preferable with respect to this solid content whole quantity, and a polymeric polyfunctional compound has more preferable 10-40 mass%.

  The content ratio of the polymerization initiator is usually 3 to 50 parts by mass, preferably 7 to 40 parts by mass, particularly preferably 10 to 10 parts by mass with respect to 100 parts by mass of the polymerizable polyfunctional compound from the viewpoints of sensitivity, resolution and developability. 35 parts by mass.

The colorant is preferably 3 to 65% by mass, more preferably 6 to 55% by mass, and particularly preferably 10 to 45% by mass with respect to the total solid content of the coloring composition.
Within this range, the effects of the present invention described above can be easily achieved, and in particular, coloring power, sensitivity, resolution, and developability are good. In particular, when the color material liquid in the present invention is used, the concentration of the color material can be increased to the above upper limit, and thus an excellent color filter as described above can be produced.

Further, the content of the solvent is preferably in the range of 55 to 95% by mass, particularly preferably in the range of 65 to 88% by mass with respect to the total amount of the colored composition containing the solvent. .
When the content of the solvent is within the above range, the coating property can be excellent.

<< Other ingredients >>
For the coloring composition, if necessary, for example, a surfactant for improving wettability, a leveling agent, a silane coupling agent for improving adhesion, an adhesion promoter, an antifoaming agent, a repellency inhibitor, An antioxidant, an aggregation inhibitor, an ultraviolet absorber, a polymerization terminator, a chain transfer agent, and the like can be contained.

<< Content of Specific Metal Element in Colored Composition >>
The colored composition for a color filter of the present invention is a colored composition containing the colorant liquid, the polymerization initiator and the alkali-soluble resin in the present invention, and includes calcium (Ca) and iron contained in the colored composition. The total mass of (Fe) is 120 mass ppm or less with respect to the whole coloring composition.

The total mass of calcium (Ca) and iron (Fe) contained in the coloring composition is preferably as small as possible unless the cost is taken into consideration, but is preferably 90 ppm by mass or less based on the whole coloring composition, 50 mass ppm or less is more preferable, 20 mass ppm or less is particularly preferable, 10 mass ppm or less is further preferable, and 3 mass ppm or less is most preferable.
Since the developability is good while maintaining dispersion stability as the upper limit or less, the color material concentration in the colored composition, and the color material concentration in the solid content of the colored composition can be increased, As a result, it is possible to obtain a color filter that realizes a high color density even with a low film thickness.

  The coloring composition that falls within the above-described metal-containing range can provide good dispersion performance, dispersion stability performance, and solubility, and also exhibits good developability when producing a color filter.

  The lower limit of “the total mass of calcium (Ca) and iron (Fe) contained in the colored composition” is not particularly limited, but is preferably 0.5 mass ppm or more, particularly preferably 1 mass ppm or more. When it is at least the above lower limit, the developability is sufficiently good, and the cost required for removing the metal element is not excessive.

Furthermore, it is preferable that the total mass of magnesium (Mg), aluminum (Al), and chromium (Cr) contained in the colored composition is 135 mass ppm or less with respect to the entire colored composition. That is, the total mass of calcium (Ca) and iron (Fe) contained in the colored composition is 120 mass ppm or less with respect to the entire colored composition, and magnesium (Mg) and aluminum (Al) It is preferable that the total mass of chromium (Cr) be 135 mass ppm or less with respect to the entire coloring composition.
By preparing a coloring composition for a color filter using the color material liquid of the present invention, it is easy to prepare an excellent coloring composition that falls within the above-described metal-containing range.

The total mass of magnesium (Mg), aluminum (Al) and chromium (Cr) contained in the colored composition is more preferably 60 ppm by mass or less, particularly preferably 30 ppm by mass or less, and still more preferably. 20 ppm by mass or less.
The effect of this invention mentioned above is especially show | played as it is below the said upper limit.

Further, the total mass of magnesium (Mg) and chromium (Cr) contained in the colored composition is preferably 135 ppm by mass or less, more preferably 60 ppm by mass or less, and 30 ppm by mass or less. Is particularly preferable, and is more preferably 20 ppm by mass or less.
The effect of this invention mentioned above is especially show | played as it is below the said upper limit.

Furthermore, “the total mass of calcium (Ca) and iron (Fe) contained in the colored composition” is not more than the upper limit, and “calcium (Ca), iron (Fe) and magnesium contained in the colored composition ( The total mass of (Mg), aluminum (Al), and chromium (Cr) ”is preferably 200 ppm by mass or less, more preferably 150 ppm by mass or less, and particularly preferably 100 ppm by mass or less, based on the entire coloring composition. 50 mass ppm or less is still more preferable, and 15 mass ppm or less is the most preferable.
The effect of this invention mentioned above is especially show | played as it is below the said upper limit.

Further, “the total mass of calcium (Ca) and iron (Fe) contained in the colored composition” is not more than the upper limit, and “calcium (Ca), iron (Fe) and magnesium contained in the colored composition ( The total mass of (Mg) and chromium (Cr) "is preferably 200 ppm by mass or less, more preferably 150 ppm by mass or less, particularly preferably 100 ppm by mass or less, and particularly preferably 50 ppm by mass or less based on the entire colored composition. More preferred is 15 mass ppm or less.
The effect of this invention mentioned above is especially show | played as it is below the said upper limit.

<< principle of operation >>
Although this invention is not necessarily limited to the range where the following action principles apply, when there is too much the total mass (or total mass of a specific metal element) of calcium (Ca) and iron (Fe) contained in a coloring composition. The principle of action in which the dispersion stability / solubility is deteriorated and the developability is deteriorated is estimated as follows.

That is, for example, the nitrogen portion contained in the a monomer (preferably the structural unit represented by the general formula (1)) in the dispersant is adsorbed to the color material to improve the dispersibility of the color material, and the dispersion It is considered that the color material firmly surrounded by the colorant is likely to flow while adsorbed to the dispersant during development, and the generation of the color material-derived residue is suppressed on the substrate.
However, if the total mass of calcium (Ca) and iron (Fe) or the total mass of the specific metal element is too much in the vicinity of the coloring material (if there is too much calcium (Ca), iron (Fe) or the specific metal element) , Because the salt-type dispersant or acidic pigment derivative that inhibits the adsorption of the dispersant to the coloring material or contributes to the improvement of the dispersibility can not contribute to the improvement of the dispersibility by interacting with a specific metal element, It is assumed that the re-solubility is lowered.

  Further, if the total mass of the specific metal element is too large, as described above, since the color material is not suitably surrounded by the dispersant, the dispersed state collapses during drying, causing color material precipitation. This is presumed to be the cause of uneven drying due to uneven distribution.

  In addition, when the color material is a dye and is used as a color material solution, if the total mass of the specific metal element is too large, the solubility of the color material is lowered and an aggregate is formed. In particular, when the amount of solvent decreases in the drying process, it is presumed that the coloring material is likely to aggregate and cause uneven drying.

The coloring composition exhibits developability by containing an alkali-soluble resin, but the above-mentioned “salt-type dispersant that does not suitably surround the colorant” reduces the developability. Is also possible. Moreover, the influence of the cation of the specific metal element more than bivalence with respect to this alkali-soluble resin is also considered.
The influence on the deterioration of the developability is more than a divalent cation such as a cation of a specific metal element (divalent) rather than a monovalent cation such as sodium ion (Na ⁺ ) or potassium ion (K ⁺ ). There is a possibility that the total amount of only the above cations and the content including trivalent cations) is larger.

  For this reason, it is considered that the coloring composition obtained using the colorant dispersion having good dispersibility stability has improved developability.

<< Preparation of Coloring Composition for Color Filter >>
The coloring composition of the present invention is prepared by blending at least an alkali-soluble resin and a polymerization initiator in a color material, and if necessary, a polymerizable polyfunctional compound and “other components”. Furthermore, it can carry out by the method of mix | blending and mixing a solvent further as needed.
When a coloring material liquid is produced and used in advance, the coloring composition can effectively prevent aggregation of the coloring material and can be uniformly dispersed.

  Further, the color material liquid in the present invention can be set to a high color material concentration while maintaining a suitable viscosity range and suitable dispersion stability / solubility, and thus was obtained using the color material liquid in the present invention. The colored composition of the present invention can also achieve a high colorant concentration while maintaining a suitable viscosity range and suitable dispersion stability / solubility.

<Color filter>
The color filter usually has a transparent substrate, a light shielding part, and a colored layer. The color filter obtained by using the coloring composition of the present invention can realize high colorant density, high color rendering properties, high contrast, and the like, and is excellent in developability when producing a color filter.

<< Colored layer >>
The colored layer is not particularly limited as long as it is formed by curing the above-described colored composition of the present invention. Usually, the colored layer is formed in an opening of a light-shielding portion on a transparent substrate described later, and the colored composition is formed. Depending on the type of color material contained in the object, it is composed of three or more colored patterns.
In addition, the arrangement of the colored layers is not particularly limited, and for example, a general arrangement such as a stripe type, a mosaic type, a triangle type, or a four-pixel arrangement type can be used. Moreover, the width | variety, area, etc. of a colored layer can be set arbitrarily.

The thickness of the colored layer is controlled by adjusting the coating method, coating conditions, solid content concentration, viscosity, etc. of the colored composition, but is usually in the range of 1 to 5 μm.
When the coloring material liquid in the present invention or the coloring composition of the present invention is used, the concentration of the coloring material in the solid content is high. Is possible. As a result, there are no effects of high color rendering, color mixing, high re-solubility, low foreign matter generation, and high productivity.

The colored layer can be formed by the following method, for example.
First, the above-described coloring composition of the present invention is applied onto a transparent substrate described later using an application means such as a spray coating method, a dip coating method, a bar coating method, a roll coating method, a spin coating method, or a die coating method. A wet coating film is formed.
Next, the wet coating film is dried using a hot plate, an oven, or the like, and then exposed to light through a mask having a predetermined pattern to cause a photopolymerization reaction between the alkali-soluble resin and the polymerizable polyfunctional compound.
Examples of the light source used for the exposure include ultraviolet rays such as a low-pressure mercury lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, and a metal halide lamp, and an electron beam.
Moreover, in order to promote a polymerization reaction after exposure, you may heat-process.

Next, it develops using a developing solution, a coating film is formed with a desired pattern by melt | dissolving and removing an unexposed part. As the developer, a solution in which an alkali is dissolved in water or a water-soluble solvent is usually used. The color material liquid and coloring composition in the present invention are extremely excellent in developability.
After the development treatment, the developer is usually washed and the cured coating film of the resin composition is dried to form a colored layer. In addition, you may heat-process in order to fully harden a coating film after image development processing.

<< Light shielding part >>
The light shielding part in the color filter is formed in a pattern on a transparent substrate described later.
The pattern shape of the light shielding part is not particularly limited, and examples thereof include a stripe shape and a matrix shape.
As this light-shielding part, for example, a black color material dispersed or dissolved in a binder resin; a metal thin film such as chromium or chromium oxide, or the like can be given. This metal thin film may be formed by laminating two layers of a CrOx film (x is an arbitrary number) and a Cr film.

  In the case where the light shielding part is obtained by dispersing or dissolving a black colorant in a binder resin, examples of a method for forming the light shielding part include a photolithography method, a printing method, and an inkjet using a resin composition for the light shielding part. The law etc. can be mentioned.

In the above case, when a photolithography method is used as a method for forming the light shielding portion, the binder resin may be, for example, an acrylate-based, methacrylate-based, polyvinyl cinnamate-based, or cyclized rubber-based reactive material. A photosensitive resin having a vinyl group is used.
In this case, the light shielding part resin composition containing a black pigment such as carbon black or titanium black as a pigment (coloring material) and a photosensitive resin includes a photopolymerization initiator, a sensitizer, a coating property improver, and a development improvement. An agent, a crosslinking agent, a polymerization inhibitor, a plasticizer, a flame retardant, etc. may be added.

  On the other hand, when the light-shielding part is a metal thin film, the light-shielding part can be formed by, for example, masking a resist pattern formed on the metal thin film by a photolithography method using a metal thin film formed by vacuum deposition or sputtering. Examples of the method include metal etching.

  The film thickness of the light-shielding part is set to about 0.05 to 0.4 μm in the case of a metal thin film, and 0.5 to 0.5 in the case where a black colorant is dispersed or dissolved in a binder resin. It is set at about 3 μm.

<< Transparent substrate >>
The transparent substrate in the color filter is not particularly limited as long as it is a base material transparent to visible light, and a transparent substrate used for a general color filter can be used. Specific examples include inflexible transparent rigid materials such as quartz glass, alkali-free glass, and synthetic quartz plates, or transparent flexible materials having flexibility such as transparent resin films and optical resin plates. It is done.
Although the thickness of the said transparent substrate is not specifically limited, Depending on a use, the thing of about 100 micrometers-1 mm can be used, for example.
The color filter of the present invention may be one in which, for example, an overcoat layer, a transparent electrode layer, an alignment film, a columnar spacer, or the like is formed in addition to the transparent substrate, the light shielding portion, and the colored layer. .

<Display device>
Another aspect of the present invention is a display device having the color filter described above. The display device is not particularly limited, and examples thereof include a liquid crystal display and an organic EL display.
The color filter obtained by using the coloring composition containing the coloring material liquid in the present invention is suitably used for a display device such as a liquid crystal display or an organic EL display.
Application of the color filter to a liquid crystal display or an organic EL display is usually performed by a known method.

  Hereinafter, the present invention will be described more specifically with reference to experimental examples. However, the present invention is not limited to these experimental examples as long as the gist thereof is not exceeded.

Preparation Example 1
<Preparation of Dispersant A (Dispersant Solution A)>
<< Synthesis of Block Copolymer A >>
A 500 mL four-neck separable flask was dried under reduced pressure, and then the interior was replaced with argon (Ar).
While flowing argon, 100 g of dehydrated tetrahydrofuran (THF), 2.0 g of methyltrimethylsilyldimethylketene acetal, 0.15 mL of 1 M acetonitrile solution of tetrabutylammonium-3-chlorobenzoate (TBACB), and 0.2 g of mesitylene were added and stirred. And mixed.
There, 36.7 g of methyl methacrylate was dripped over 45 minutes using the dropping funnel. As the reaction progressed, heat was generated, so the temperature was kept below 40 ° C by cooling with ice. After 1 hour, 13.3 g of dimethylaminoethyl methacrylate (DMAEMA) was added dropwise as the “a monomer” over 15 minutes. After reacting for 1 hour, 5 g of methanol was added to stop the reaction.

The solvent was removed under reduced pressure to obtain block copolymer A.
The mass average molecular weight determined by GPC measurement (NMP, LiBr 10 mM) was 6000. The amine value was 95 mgKOH / g.
The obtained block copolymer A was dissolved in propylene glycol monomethyl ether acetate (PGMEA) to prepare a 60% by mass block copolymer solution.

<< Step of Converting Block Copolymer to Salt (Preparation Step of Basic Block Dispersant) >>
Next, in a 100 mL round-bottomed flask, 5.0 parts by mass of the block copolymer solution obtained above was mixed with 23.76 parts by mass of PGMEA, and phenylphosphonic acid (Tokyo Kasei ( 0.94 parts by mass (0.5 molar equivalent with respect to the DMAEMA unit of the block copolymer) was added and stirred at a reaction temperature of 40 ° C. for 2 hours to obtain “dispersant A”. Then, it was appropriately diluted with PGMEA to prepare “dispersant solution A” having a solid content of 20% by mass.
Dispersant A is a dispersant having no acid value (0 mg KOH / g).

Preparation Example 2
<Preparation of Dispersant B (Dispersant Solution B)>
<< Synthesis of Block Copolymer B >>
Add 250 parts by mass of dehydrated tetrahydrofuran (THF) and 0.6 parts by mass of lithium chloride to a 500 mL round bottom 4-neck separable flask equipped with a condenser, addition funnel, nitrogen inlet, mechanical stirrer, and digital thermometer. Fully nitrogen substitution was performed.
After cooling the reaction flask to −60 ° C., 4.9 parts by mass of butyllithium (15% by mass hexane solution), 1.1 parts by mass of diisopropylamine, and 1.0 parts by mass of methyl isobutyrate were injected using a syringe. .

As the “b monomer”, 2.2 parts by mass of 1-ethoxyethyl methacrylate (EEMA), 18.7 parts by mass of 2-hydroxyethyl methacrylate (HEMA), 12.8 parts by mass of 2-ethylhexyl methacrylate (EHMA) , 13.7 parts by mass of n-butyl methacrylate (BMA), 9.5 parts by mass of benzyl methacrylate (BzMA), and 17.5 parts by mass of methyl methacrylate (MMA) over 60 minutes using an addition funnel It was dripped.
30 minutes later, 26.7 parts by mass of dimethylaminoethyl methacrylate (DMAEMA) as the “a monomer” was dropped over 20 minutes.

After reacting for 30 minutes, 1.5 parts by mass of methanol was added to stop the reaction. The obtained precursor block copolymer THF solution was reprecipitated in hexane, purified by filtration and vacuum drying, diluted with PGMEA to obtain a solid content solution of 30% by mass.
32.5 parts by mass of water was added, the temperature was raised to 100 ° C., and the mixture was reacted for 7 hours to deprotect the structural unit derived from EEMA to obtain a structural unit derived from methacrylic acid (MAA).
The obtained block copolymer PGMEA solution was re-precipitated in hexane, purified by filtration and vacuum drying, and “A block containing the structural unit represented by the general formula (1)” and “carboxy group-containing monomer” A block copolymer B containing a derived structural unit and having a solvophilic B block ”was obtained.

The acid value of the block copolymer B was 8 mgKOH / g, and Tg was 38 ° C.
When the obtained block copolymer B was confirmed by GPC (gel permeation chromatography), the weight average molecular weight Mw was 7730. The amine value was 95 mgKOH / g.

<< Step of Converting Block Copolymer to Salt (Preparation Step of Basic Block Dispersant) >>
Next, salt formation was performed in the same manner as in Preparation Example 1 to prepare “Dispersant B”, which was further diluted with PGMEA to prepare “Dispersant Solution B” having a solid content of 20% by mass.
Similarly to Preparation Example 1, 0.5 mol equivalent of phenylphosphonic acid (manufactured by Tokyo Chemical Industry Co., Ltd.), which is a salt-forming component, was added to “DMAEMA unit that is a monomer” of block copolymer B.

Preparation Example 3
<Purification of organic pigments>
2.0 parts by mass of the organic pigment (R-1) shown in Table 1, 100 parts by mass of ion-exchanged water, placed in a beaker, and stirred for 10 minutes with an ultrasonic homogenizer by a batch method while maintaining at 30 ° C. Filtration was performed using filter paper.
Manufacturing and sales company: ADVANTEC
Product name: FILTER PAPER QUANTITIVE ASHLESS
Standard: 5C, 150mm (100CIRCLES)

  In each case, the method of performing the washing (washing) step twice is referred to as “Purification Method 1” (Coloring Material Dispersion Preparation Example 1), and the method of performing 20 times is referred to as “Purification Method 2” (Coloring Material Dispersion Preparation Example 2). ), And the method performed 30 times was designated as “Purification Method 3” (Color Material Dispersion Preparation Example 3, Color Material Dispersion Preparation Example 9).

In addition, 2.0 parts by mass of the organic pigment (R-1) shown in Table 1 was used, a Nutsche funnel was used, and 30000 parts by mass of total ion-exchanged water was allowed to flow for 15 minutes, and suction was performed by a continuous method. Washed by filtration (washed with water). Subsequently, it filtered using the said filter paper.
The temperature of the ion exchange water that flowed was 30 ° C. This method was designated as “Purification Method 4” (Color Material Dispersion Preparation Example 4).

Purified organic pigments were prepared using purification methods 1-4.
In the color material dispersion preparation examples 5 to 8 and the color material dispersion preparation examples 101 to 103, the organic pigment was not purified.
Using the obtained (purified) organic pigments, color material dispersions were prepared as in the following color material dispersion preparation examples 1 to 9 and color material dispersion preparation examples 101 to 103, respectively.

Preparation Example 4
<(4-1) Synthesis of Resin 1>
In a polymerization tank containing 40 parts by mass of BzMA, 15 parts by mass of MMA, 25 parts by mass of MAA, and 3 parts by mass of AIBN and 150 parts by mass of PGMEA, the mixture was added at 100 ° C. under a nitrogen stream at 3O 0 C. It was added dropwise over time. After completion of dropping, the mixture was further heated at 100 ° C. for 3 hours to obtain a polymer solution.
The weight average molecular weight of the polymer in this polymer solution was 7000.

Next, 20 parts by weight of GMA, 0.2 parts by weight of triethylamine, and 0.05 parts by weight of p-methoxyphenol are added to the obtained polymer solution and heated at 110 ° C. for 10 hours to Resin 1 was synthesized by reacting the carboxy group of methacrylic acid with the epoxy group of GMA.
During the reaction, air was bubbled through the reaction solution to prevent polymerization of GMA. The reaction was followed by measuring the acid value of the solution.

  The obtained resin 1 is a resin in which a side chain having an ethylenic double bond is introduced into the main chain of a polymer formed by copolymerization of BzMA, MMA and MAA using GMA, and has a solid content of 40 mass. %, Acid value 74 mgKOH / g, and weight average molecular weight 12000.

<< Name of Abbreviation >>
BzMA benzyl methacrylate MMA methyl methacrylate MAA methacrylic acid GMA glycidyl methacrylate AIBN azobisisobutyronitrile PGMEA propylene glycol monomethyl ether acetate

<Synthesis of (4-2) Resin 6>
The above (4-1) except that “20 parts by mass of styrene and 20 parts by mass of N-phenylmaleimide (Tokyo Chemical Industry Co., Ltd.)” was used instead of “40 parts by mass of BzMA” ( Resin 6 was obtained in the same manner as in 4-1).
The obtained resin 6 had a solid content of 40% by mass, an acid value of 74 mgKOH / g, and a weight average molecular weight of 12,000.

Preparation Example 5
<Synthesis of acidic dye derivatives>
374.76 parts by mass of fuming sulfuric acid having a sulfur trioxide content of 11% by mass was stirred while being cooled to 10 ° C., and 74.96 parts by mass of Pigment Yellow 138 was added. Subsequently, it stirred at 90 degreeC for 6 hours. The obtained reaction solution was added to 1600 parts by mass of ice water and stirred for 15 minutes, and then the precipitate was filtered.
The obtained wet cake was washed three times with 800 parts by mass of demineralized water. The wet cake after washing was vacuum dried at 80 ° C. to obtain a yellow pigment sulfonated derivative which is an acidic dye derivative. The molecular weight was measured by TOF-MS, and it was confirmed that it was a synthesis target.

<Preparation of color material liquid>
Color material dispersion preparation example 1
16.7 parts by mass of “resin 1 (BzMA / MMA / MAA / GMA = 40/15/25/20 (mass ratio), weight average molecular weight 12000) solid content 40 mass% PGMEA solution” obtained in Preparation Example 4 In addition, 8.1 parts by mass of the dispersant solution A, 60.2 parts by mass of PGMEA, and 2.0 parts by mass of 3-methoxy-3-methyl-1-butyl acetate were stirred and mixed with a dissolver to be uniformly dissolved.

To this solution, 12.7 parts by mass of the (purified) organic pigment obtained in Preparation Example 3 and 0.3 part by mass of the acidic dye derivative obtained in Preparation Example 5 were added, and the particle size was 2.0 mm. The mass part was put into a mayonnaise bin, and shaken for 1 hour with a paint shaker (manufactured by Asada Tekko Co., Ltd.) as preliminary crushing.
Next, the zirconia beads having a particle diameter of 2.0 mm are taken out, 200 parts by mass of zirconia beads having a particle diameter of 0.1 mm are added, and similarly, this dispersion is dispersed for 4 hours with a paint shaker, and a red color material dispersion liquid is obtained. Was prepared.

Color Material Dispersion Preparation Examples 2-7, 9
The colorant and dispersant were changed as shown in Table 1, and each of the (purified) organic pigments obtained in Preparation Example 3 was used in the same manner as in Colorant Dispersion Preparation Example 1. 2 to 7 and 9 colorant dispersions were prepared. In Color Material Dispersion Preparation Examples 5 to 8, the organic pigment used was not washed with water because the content of the specific metal element was small.

Color material dispersion preparation example 8
The colorant is changed to (G-1) as shown in Table 1, and the dispersant A (dispersant solution A) is changed to BYK21116 (BIC Chemie Japan, basic block type dispersant) (dispersant in terms of solid content) A green color material dispersion was prepared in the same manner as in Color Material Dispersion Preparation Examples 1 to 7, except that the same mass as A and Dispersant B was used. In Colorant Dispersion Preparation Example 8, the organic pigment (G-1) used was not washed with water because the content of the specific metal element was small.

Colorant dispersion preparation example 10
To a flask, 1000 parts by mass of methanol was added to 100 parts by mass of Acid Red 289 (AR289; xanthene dye, manufactured by Tokyo Chemical Industry Co., Ltd.) purified by the “Purification Method 4” and dissolved with a magnetic stirrer. After confirming the dissolution, 29.9 parts by mass of concentrated hydrochloric acid was added and stirred, and the sulfonate salt of AR289 was used as a sulfo group. To this solution, 1000 parts by mass of PGMEA was further added. Next, 276 parts by mass of the dispersant A was added and stirred. Thereafter, a reflux condenser was connected, the temperature was raised to 80 ° C. with a water bath, and the reaction was performed for 4 hours after reaching 80 ° C. Thereafter, methanol was distilled off by an evaporator at a water bath of 45 ° C., 1000 parts by mass of PGMEA was added, and the mixture was allowed to cool at room temperature for 16 hours. Next, the precipitate is filtered off, the filtrate is washed with about 100 parts by mass of PGMEA, the obtained filtrate is recovered, and the color material dispersion of Preparation Example 10 in which the dye is uniformly dispersed is obtained. Obtained.
The particle size distribution was measured using a Microtrac UPA particle size distribution meter (manufactured by Nikkiso Co., Ltd.). The evaluation was carried out with a 50% average particle diameter, and the result of volume conversion (MV) was 78 nm.

Color material solution preparation example 11
A coloring material solution was prepared by dissolving 21.3 parts by mass of the dye (Y-2) (CI Solvent Yellow 162) in 100 parts by mass of diacetone alcohol. The used dye (Y-2) was purified by recrystallization using a mixed solvent of water and acetone (water: acetone = 50: 50 by mass ratio) and filtered.

Color Material Dispersion Preparation Examples 101-103
The colorant was changed as shown in Table 1 and the colorant dispersion was used except that “an organic pigment that was not a purified organic pigment purified as in Preparation Example 3” was used (except that the organic pigment was not purified). In the same manner as in Preparation Example 1, color material dispersion liquids of Color Material Dispersion Preparation Examples 101 to 103 were prepared.

<Preparation of coloring composition for color filter>
Coloring composition preparation examples 11-19, 111-113
The coloring composition preparation examples 11 to 19 use the color material dispersion liquids of the coloring material dispersion preparation examples 1 to 9, respectively, and the coloring composition preparation examples 111 to 113 are the colors of the coloring material dispersion preparation examples 101 to 103, respectively. Using the material dispersion, the solid content concentration was adjusted with PGMEA as needed, and each component was mixed with the composition shown below to prepare colored compositions for color filters.

Color material dispersion preparation examples 1 to 9 and color material dispersion preparation examples 101 to 103 color material dispersion liquids (solid content: 21.3% by mass): 52.7 parts by mass The same resin as Resin 1 used in Preparation Example 1 was used as an “alkali-soluble resin”, and the alkali-soluble resin: 3.04 parts by mass. Polymerizable polyfunctional compound (Aronix M-403, manufactured by Toagosei Co., Ltd., photocured) Functional polyfunctional monomer): 2.84 parts by mass / photopolymerization initiator (BASF, Irgacure 907, photopolymerization initiator): 0.89 parts by mass / surfactant (manufactured by DIC Corporation, MegaFuck) F-559): 0.03 parts by mass PGMEA: 40.5 parts by mass Silane coupling agent (manufactured by Shin-Etsu Silicone, KBM-503): 0.2 parts by mass

Coloring composition preparation example 21
Coloring for color filter in the same manner as in Coloring Composition Preparation Example 17 except that the following (Change 1), (Change 2) and (Change 3) were changed in Colored Composition Preparation Example 17. A composition was prepared.

(Change 1)
Instead of “photopolymerization initiator (BASF, Irgacure 907, photopolymerization initiator): 0.89 parts by mass”, the following photopolymerization initiator and mercapto compound were used.
Photopolymerization initiator (ADEKA, NCI-831): 0.36 parts by weight Photopolymerization initiator (BASF, Irgacure 369): 0.27 parts by weight Photopolymerization initiator (BASF, Irgacure) 907): 0.27 parts by massPentaerythritol tetrakis (3-mercaptopropionate) (manufactured by SC Organic Chemical Co., PEMP): 0.18 parts by mass

(Change 2)
As a solvent, “PGMEA 28.6 parts by mass and 3-methoxy-3-methyl-1-butyl acetate 12.0 parts by mass” were used instead of “PGMEA 40.5 parts by mass”.

(Change 3)
Resin 6 was used instead of resin 1 as the alkali-soluble resin.

Coloring composition preparation examples 22-29, 121
The solvent used in the preparation of the color material dispersion and the solvent when the color composition for color filter was prepared using the color material dispersion were changed, and the solvent in the final color composition for color filter was changed. A colored composition for a color filter was prepared in the same manner as in the colored composition preparation example 21 except that the composition was changed as shown in Table 3.

Coloring composition preparation example 30
A colored composition for a color filter was prepared in the same manner as in the colored composition preparation example 21, except that pentaerythritol tetrakis (3-mercaptopropionate) was not used.

Coloring composition preparation example 31
Instead of the color material dispersion prepared in Color Material Dispersion Preparation Example 7, the same procedure as in Color Composition Preparation Example 30 was used except that the color material dispersion prepared in Color Material Dispersion Preparation Example 10 was used. A coloring composition for a color filter was prepared.

Coloring composition preparation example 32
A colored composition for a color filter was prepared in the same manner as in the colored composition preparation example 21, except that the photopolymerization initiator was changed as shown in Table 3 in the colored composition preparation example 21.

Colored Composition Preparation Example 33
In the same manner as in the color composition preparation example 30, except that the color material solution prepared in the color material solution preparation example 11 was used instead of the color material dispersion prepared in the color material dispersion preparation example 7, A coloring composition for a filter was prepared.

Coloring composition preparation example 122
In the colored composition preparation example 111, except that the following (change 1 ′) and the above (change 2) and (change 3) were changed, the same as in the case of the colored composition preparation example 111, A coloring composition for a color filter was prepared.

(Change 1 ')
Instead of “photopolymerization initiator (BASF, Irgacure 907, photopolymerization initiator): 0.89 parts by mass”, the following photopolymerization initiator was used.
Photopolymerization initiator (ADEKA, NCI-831): 0.36 parts by weight Photopolymerization initiator (BASF, Irgacure 369): 0.27 parts by weight Photopolymerization initiator (BASF, Irgacure) 907): 0.27 parts by mass

Coloring composition preparation example 41
Coloring for color filter in the same manner as in the coloring composition preparation example 14 except that the above-mentioned (changed point 1), (changed point 2) and (changed point 3) were changed. A composition was prepared.

Colored composition preparation examples 42 to 57, 131
The solvent used in the preparation of the color material dispersion and the solvent when the color composition for color filter was prepared using the color material dispersion were changed, and the solvent in the final color composition for color filter was changed. A colored composition for a color filter was prepared in the same manner as in the case of the colored composition preparation example 41 except that the composition was changed as shown in Table 4.

Coloring composition preparation example 132
Coloring for color filter in the same manner as in the coloring composition preparation example 111 except that the above-mentioned (changed point 1), (changed point 2) and (changed point 3) were changed. A composition was prepared.

Measurement example <Quantitative determination of metal in colorant liquid>
Using an ICP (Inductively Coupled Plasma) emission spectroscopic analyzer (Varian, Vista-PRO), calcium (Ca), iron (Fe), magnesium in a color material liquid (color material dispersion or color material solution) ( The contents of Mg), aluminum (Al) and chromium (Cr) were quantified.
The measurement sample was prepared as follows. That is, about 1 g (0.5 to 1.5 g) of the coloring material solution is precisely weighed, heated on a burner and in an electric furnace (700 ° C.), incinerated, and then diluted with aqua regia, Heated on plate to dissolve.
The obtained solution was diluted with ultrapure water to make a total of 50.000 g as a measurement sample.

The detection limit of ICP emission spectroscopic analysis in the present invention is less than 0.01 ppm.
“0 mass ppm” in Tables 1 to 3 indicates that “0” is rounded off to “1”, that is, less than 0.5 mass ppm. Since the measurement sample is diluted about 50 times as described above, “0” in the table indicates that it is below the detection limit of the measurement apparatus.

Evaluation Example <Evaluation Method of “Dispersion Stability” of Color Material Dispersion>
The color material dispersion prepared in the color material dispersion preparation example was stored at room temperature (25 ° C.), and the viscosity was measured after 1 day and 1 month after preparation. The viscosity was measured at 25.0 ± 1.0 ° C. using a vibration viscometer (manufactured by Seconic Corporation, VM-200T2), and a value 30 seconds after the start of measurement was adopted.

<< Criteria >>
The viscosity after 1 day of preparation was compared with the viscosity after storage for 1 month and determined as follows.
A: Viscosity change within 3% A: Viscosity change exceeds 3% and within 5% B: Viscosity change exceeds 5% and within 7% C: Viscosity change exceeds 7% and within 10% D: Viscosity Change exceeds 10%

  The results are shown in Table 1. If the change in viscosity is within 7%, that is, if the “dispersion stability” is “B” or more, it is evaluated as being excellent in stability and at a practical level.

<Evaluation method of “optical characteristics” of coloring composition for color filter>
Using the spin coater, the desired color (red colored layer: red colored layer: the colored composition obtained in each colored composition preparation example is spin-coated on a glass substrate (manufactured by NH Techno Glass Co., Ltd., “NA35”). The coating was performed so that x = 0.650 using a C light source, green colored layer: y = 0.450, yellow colored layer: y = 0.500. After heating and drying on an 80 ° C. hot plate for 3 minutes, ultraviolet rays of 60 mJ / cm ² were irradiated using an ultrahigh pressure mercury lamp, and then post-baked for 25 minutes in a 230 ° C. clean oven.

The contrast, chromaticity (x, y), and luminance (Y) of the obtained colored film were measured. Contrast was measured using “Contrast measuring device CT-1B” manufactured by Aisaka Electric Co., Ltd., and chromaticity and luminance were measured using “Microspectroscopy measuring device OSP-SP200” manufactured by Olympus Corporation.
The results are shown in Tables 2-4.

<< Criteria >>
The contrast is evaluated to be excellent if the red colored layer is 12000 or more, the green colored layer is 18000 or more, and the yellow colored layer is 10000 or more.

<Evaluation Method of “Drying Unevenness” of Colored Color Filter Composition>
After the color filter coloring composition was applied to a glass substrate using a die coater, vacuum baking was performed until the degree of vacuum reached 0.2 torr to form a coating film having a thickness of 2.0 μm. Then, the obtained board | substrate was observed using the interference fringe inspection lamp (Na lamp), and the presence or absence of the drying nonuniformity which generate | occur | produces in a coating film was evaluated visually.

<< Criteria >>
AA: Drying unevenness is not recognized at all.
A: Slight unevenness of drying is observed.
B: Many drying unevenness is recognized.

<Evaluation method 1 (development speed) of “developability” of coloring composition for color filter>
The color filter coloring composition obtained in each of the coloring composition preparation examples was applied on a glass substrate using a spin coater, and then dried at 80 ° C. for 3 minutes using a hot plate.
This colored layer is exposed to ultraviolet light of 60 mJ / cm ² using an ultrahigh pressure mercury lamp through an independent fine line pattern photomask having a line width of 1 μm to 100 μm, whereby a thickness of 2.0 μm is formed on the glass substrate. A colored layer was formed.

  Next, 0.05 mass% potassium hydroxide (KOH) aqueous solution is used as a developer, spin-developed, contacted with the developer, washed with pure water, developed to form a pattern, and developability Evaluated.

  In the development process, the time until the unexposed area was dissolved and removed was measured. The end of development was observed visually and the development time was determined according to the following criteria.

<< Criteria >>
AA: Less than 40 seconds A: 40 seconds or more and less than 60 seconds B: 60 seconds or more and less than 80 seconds C: 80 seconds or more and less than 120 seconds D: 120 seconds or more

The results are shown in Tables 2-4.
When the development time is less than 40 seconds (AA), the “development speed” is particularly excellent, and when the development time is 40 seconds or more and less than 60 seconds (A), the “development speed” is more excellent, and the development time is If it is 60 seconds or more and less than 80 seconds (B), the “development speed” is excellent, and all of AA, A, and B are good and determined to be at a practical level.
On the other hand, if the development time is 80 seconds or longer (C, D), the “development speed” is inferior, and it is determined that the development level is not practical.

<Evaluation Method 2 (Development Residue) of “Developability” of Coloring Composition for Color Filter>
By applying the photosensitive colored resin composition for a color filter obtained in each coloring composition preparation example on a glass substrate using a spin coater, and then drying at 60 ° C. for 3 minutes using a hot plate, A colored layer having a thickness of 2.5 μm was formed. The glass plate on which the colored layer was formed was shower-developed for 60 seconds using a 0.05% by mass aqueous potassium hydroxide solution as an alkaline developer. After observing the unexposed portion (50 mm × 50 mm) of the glass substrate after the formation of the colored layer by visual observation, the glass substrate is thoroughly wiped with a lens cleaner (trade name Toraysee MK Clean Cloth, manufactured by Toray Industries, Inc.), The coloring degree of the lens cleaner was visually observed.

<< Criteria >>
AA: The development residue was not visually confirmed and the lens cleaner was not colored at all. A: The development residue was not visually confirmed, and the color of the lens cleaner was slightly confirmed. B: The development residue was slightly confirmed by visual observation. The color of the lens cleaner was confirmed. C: The development residue was confirmed by visual observation, and the color of the lens cleaner was confirmed.

The results are shown in Tables 2-4.
If the determination result is A, B or C, it can be used practically, but if the determination result is B and further A, the effect is more excellent.

<Evaluation method of “re-solubility” of coloring composition for color filter>
The tip of a glass substrate having a width of 0.5 cm and a length of 10 cm was immersed in the color filter coloring composition and applied to a 1 cm length portion of the glass substrate. The pulled-up glass substrate was put into a constant temperature and humidity chamber so that the glass surface was horizontal, and dried at a temperature of 23 ° C. and a humidity of 80% RH for 30 minutes. Next, the glass substrate to which the dried coating film was adhered was immersed in PGMEA for 15 seconds. At this time, the redissolved state of the dried coating film was visually discriminated and evaluated. The results are shown in Table 3 and Table 4 together.

<< Criteria >>
AA: The dry coating film was completely dissolved. A: A thin film of the dry coating film was formed in the solvent, and the thin film was dissolved. B: A thin film of the dry coating film was formed in the solvent, and the solution was colored. C: In the solvent. If AA, A, or B, in which a thin film of a dried coating film was formed and the solution was not colored, it can be used without any problem in practice.

<Evaluation method of “water stain” of coloring composition for color filter>
After applying the coloring composition for a color filter obtained in each coloring composition preparation example on a glass substrate with a film thickness that forms a 1.6 μm-thick coloring layer after post-baking using a spin coater, It dried for 3 minutes at 60 degreeC using the plate, and the colored layer was formed on the glass substrate by irradiating the whole surface of 60mJ / cm < ² > of ultraviolet-rays using an ultrahigh pressure mercury lamp not through a photomask. Next, spin development is performed using 0.05 wt% potassium (KOH) as a developer, the developer is subjected to an indirect solution for 60 seconds and then washed with pure water, and the washed substrate is rotated for 10 seconds to remove water. Immediately after centrifugation, the contact angle of pure water was measured as described below to evaluate water stain.
The contact angle of pure water was measured by dropping 1.0 μL of pure water on the surface of the colored layer immediately after removing the water by centrifugation, and determining the static contact angle 10 seconds after the landing according to the θ / 2 method. Measured. The measuring device was measured using a contact angle meter DM 500 manufactured by Kyowa Interface Science Co., Ltd.

<< Criteria >>
A: Contact angle of 85 ° or more A: Contact angle of 80 ° or more and less than 85 ° B: Contact angle of 65 ° or more and less than 80 ° C: Contact angle of 50 ° or more and less than 65 ° D: Contact angle of less than 50 ° If it is above, it can be used practically, but if the evaluation result is A, the effect of suppressing the occurrence of water stain is high, and if it is AA, the effect of suppressing the occurrence of water stain is extremely high.

In Table 1, the color materials are as follows. The same applies to Tables 2 to 4.
“R-1” (organic pigment): C.I. I. R177, manufactured by BASF, and chromophthaled red A3B.
“R-2” (organic pigment): C.I. I. R177, manufactured by BASF, and chromophthaled red A2B.
“R-3” (organic pigment): C.I. I. R177, manufactured by BASF, Irgadine Red A2BN.
“R-4” (organic pigment): C.I. I. R177, manufactured by Yuri Chemical Co., Ltd., FAST REDA3B.
“Y-1” (organic pigment): C.I. I. Y138, manufactured by BASF Corp., Pariol Yellow K0961HD.
“G-1” (organic pigment): C.I. I. G58, manufactured by DIC, FASTOGEN Green A110.
“V-1” (dye): C.I. I. It is Acid Red 289 and Tokyo Chemical Industry AR289.
“Y-2” (dye): C.I. I. Solvent Yellow 162, NEPTU YELLOW 075 manufactured by BASF Corporation.

The contents of sodium (Na) and potassium (K) are not shown in Table 1, but were almost the same in all examples.
Moreover, although not described in Table 1, the color material dispersion preparation examples 1 to 9 each had a practical viscosity as low as 20 mPa · s or less in initial viscosity of the color material dispersion.
The viscosity was measured at 25.0 ± 1.0 ° C. using a vibration viscometer (manufactured by Seconic, VM-200T2). If the viscosity of the colorant dispersion is 20 mPa · s or less, it is within the practical range.

In Tables 3 and 4, the photopolymerization initiator is as follows.
“NCI-831”: oxime ester photopolymerization initiator (manufactured by ADEKA)
“Irg369”: α-aminoketone photopolymerization initiator (Irgacure 369, manufactured by BASF)
“Irg907”: α-aminoketone photopolymerization initiator (Irgacure 907, manufactured by BASF)

In Tables 3 and 4, “solvent A” is the first solvent and “solvent B” is the second solvent. Specific components of the solvent are as follows.
Solvent 1: Propylene glycol monomethyl ether acetate (PGMEA)
Solvent 2: 3-methoxy-3-methyl-1-butyl acetate Solvent 3: Ethyl 3-ethoxypropionate (EEP)
Solvent 4: 3-methoxybutyl acetate
Solvent 5: Diethylene glycol ethyl methyl ether (EMDG)
Solvent 6: Propylene glycol monomethyl ether (PGME)
Solvent 7: Ethyl carbitol acetate Solvent 8: Butyl carbitol acetate (BCA)
Solvent 9: Diethylene glycol monobutyl ether Solvent 10: Propyl benzoate Solvent 11: 1,3-butylene glycol diacetate

<Results on colorant dispersion>
As can be seen from Table 1, the color material in which the total mass of calcium (Ca) and iron (Fe) contained in the color material dispersion for color filters is 180 mass ppm or less with respect to the entire color material dispersion for color filters. In all of the dispersion liquid preparation examples, the dispersion stability was “AA”, “A” or “B” determination, which was a practical level.
On the other hand, in all of the color material dispersion preparation examples in which the total mass of calcium (Ca) and iron (Fe) is more than 180 ppm by mass with respect to the entire color material dispersion for color filter, the dispersion stability is “C”. Or it was "D" determination and it did not reach a practical use level.
Moreover, it turned out that the said result can be said irrespective of the kind of coloring material. Further, even if the total concentration of calcium (Ca) and iron (Fe) is lowered by washing (coloring material dispersion preparation examples 1 to 4 and 9), even when the total concentration is low from the beginning (coloring material dispersion preparation) Examples 5 to 8) were found to have high dispersion stability. Moreover, it turned out that the said tendency can be said irrespective of the kind of coloring material.

  Further, before washing with water, the total concentration of calcium (Ca) and iron (Fe) is more than 180 ppm by mass with respect to the entire color material dispersion for color filter, and the dispersion stability is determined as “C”. Color Material Dispersion Preparation Example in which the total concentration of calcium (Ca) and iron (Fe) in the color material dispersion is 180 mass ppm or less by washing the organic pigment (R-1) of Liquid Preparation Example 101 with water. In each of 1-4, 9, the dispersibility was judged as “A” or “AA”.

When the number of washing (washing) was increased, the dispersion stability was improved (Coloring Material Dispersion Preparation Examples 1 to 3), and when washed (washing) with a continuous method, the dispersion stability was excellent (Coloring Material Dispersion Preparation Example 4). ).
Further, when Color Material Dispersion Preparation Example 3 and Color Material Dispersion Preparation Example 9 in which only the colorant (organic pigment) and the purification method were unified and only the dispersant was changed were compared with each other, “AA” determination was made. The colorant dispersion preparation example 9 using the dispersant B was superior in dispersion stability to the colorant dispersion preparation example 3 using the dispersant A.

<Results on Colored Composition for Color Filter>
Moreover, as can be seen from Table 2, the colored composition having a total mass of calcium (Ca) and iron (Fe) contained in the colored composition for color filter is 120 mass ppm or less with respect to the entire colored composition for color filter. In all of the product preparation examples, the development speed was “AA”, “A” or “B” judgment, which was excellent or practical. In addition, any colored composition was excellent in stability.
On the other hand, in any of the colored composition preparation examples in which the total mass of calcium (Ca) and iron (Fe) is more than 120 mass ppm with respect to the entire colored composition for a color filter, the development rate is “C” or “D”. It was a judgment and did not reach a practical level. Moreover, it turned out that the said tendency can be said irrespective of the kind of coloring material.

  Further, when coloring composition preparation example 13 and coloring composition preparation example 19 in which the colorant (organic pigment) and the purification method are unified and only the dispersant is changed are compared, coloring composition preparation example 19 using dispersant B is compared. The development rate was better than that of Colored Composition Preparation Example 13 using Dispersant A, and the determination was “AA”.

As can be seen from Table 3, as a solvent, propylene glycol monomethyl ether acetate (PGMEA) and a solvent having a boiling point of 150 ° C. or higher as compared with the case where propylene glycol monomethyl ether acetate (PGMEA) is used alone (colored composition preparation example 121). In the colored composition preparation examples 21 to 26 and 30 to 33 using the mixed solvent, drying unevenness was less likely to occur, and re-solubility was improved. In colored composition preparation example 27 using a mixed solvent of propylene glycol monomethyl ether acetate (PGMEA) and an alcohol solvent, re-solubility was improved.
In colored composition preparation examples 28 to 29 using propylene glycol monomethyl ether acetate (PGMEA), a solvent having a boiling point of 150 ° C. or higher, and a mixed solvent of three alcoholic solvents, re-solubility was extremely good.
Moreover, generation | occurrence | production of water stain was able to be suppressed compared with the case where a coloring composition contains a mercapto compound (coloring composition preparation examples 21-29) and the case where it does not contain (coloring composition preparation example 30).

  As can be seen from Table 4, when a high-boiling solvent having a boiling point of 200 ° C. or higher is used as the second solvent, re-solubility is particularly improved (Colored Composition Preparation Examples 47, 49 to 52). When the boiling point was too high, drying unevenness was likely to occur (colored composition preparation example 47).

  Since the coloring composition with a specific metal content of the present invention has a high colorant concentration and low viscosity, it can reduce the film thickness of the color filter, and is widely used for manufacturing various displays. It is what is done.

Claims (15)

  A color filter liquid material containing a color material and a solvent, wherein the total mass of calcium (Ca) and iron (Fe) contained in the color filter liquid material is the total color material liquid for the color filter. On the other hand, a color material liquid for a color filter, which is 180 ppm by mass or less and contains two or more solvents.   2. The color according to claim 1, wherein the total mass of magnesium (Mg) and chromium (Cr) contained in the color material liquid for color filter is 200 mass ppm or less with respect to the entire color material liquid for color filter. Color material liquid for filters.   Furthermore, the total mass of magnesium (Mg), aluminum (Al), and chromium (Cr) contained in the color material liquid for color filter is 200 ppm by mass or less with respect to the entire color material liquid for color filter. The color material liquid for color filters according to claim 1 or 2.   Contains a glycol ether acetate solvent as the first solvent, and contains at least one solvent selected from the group consisting of a solvent having an alcoholic hydroxyl group and a solvent having a boiling point at atmospheric pressure of 150 ° C. or higher as the second solvent. The color material liquid for a color filter according to any one of claims 1 to 3. The color material liquid for a color filter according to any one of claims 1 to 4, comprising a dispersant containing a structural unit represented by the following general formula (1).

[In General Formula (1), R ¹ is a hydrogen atom or a methyl group, A is a divalent linking group, R ² and R ³ are each independently a hydrocarbon group that may contain a hydrogen atom or a heteroatom. R ² and R ³ may be bonded to each other to form a ring structure. ] At least a part of the structural unit represented by the general formula (1) in the dispersant is represented by the following general formulas (2) to (4) so that nitrogen of the structural unit becomes a cation. The color material liquid for a color filter according to claim 5, which is a structural unit formed by combining one or more compounds selected from the group consisting of compounds to form a salt.

[In General Formula (2), R ^a is a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms; a vinyl group, a phenyl group or a benzyl group which may have a substituent; O—R ^e , where R ^e is a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms; a vinyl group, a phenyl group or a benzyl group which may have a substituent; or carbon number It represents a (meth) acryloyl group via 1 to 4 alkylene groups. ]

[In General Formula (3), R ^b , R ^{b ′,} and R ^{b ″} each independently represent a hydrogen atom; an acidic group or an ester group thereof; A chain, a branched chain or a cyclic alkyl group; a vinyl group which may have a substituent, a phenyl group or a benzyl group; or —O—R ^f , wherein R ^f is a carbon which may have a substituent, A linear, branched or cyclic alkyl group of 1 to 20; an optionally substituted vinyl group, phenyl group or benzyl group; or (meth) acryloyl via an alkylene group of 1 to 4 carbon atoms Represents a group, and X represents a chlorine atom, a bromine atom or an iodine atom.]

[In General Formula (4), R ^c and R ^d each independently have a hydrogen atom; a hydroxyl group; a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms; and a substituent. , a vinyl group, a phenyl group or benzyl group; represents or -O-R ^g, R ^g is 1 to 20 carbon atoms, straight-chain, branched or cyclic alkyl group; which may have a substituent, A vinyl group, a phenyl group or a benzyl group; or a (meth) acryloyl group via an alkylene group having 1 to 4 carbon atoms. However, at least one of R ^c and R ^d contains a carbon atom. ]   A coloring composition containing a coloring material, a polymerization initiator and an alkali-soluble resin, wherein the total mass of calcium (Ca) and iron (Fe) contained in the coloring composition is 120 with respect to the whole coloring composition. A coloring composition for a color filter having a mass ppm or less and containing two or more solvents.   Furthermore, the coloring composition for color filters of Claim 7 whose total mass of magnesium (Mg) and chromium (Cr) contained in this coloring composition is 135 mass ppm or less with respect to this whole coloring composition.   Furthermore, the total mass of magnesium (Mg), aluminum (Al), and chromium (Cr) contained in the colored composition is 135 mass ppm or less with respect to the entire colored composition. The coloring composition for color filters as described.   Contains a glycol ether acetate solvent as the first solvent, and contains at least one solvent selected from the group consisting of a solvent having an alcoholic hydroxyl group and a solvent having a boiling point at atmospheric pressure of 150 ° C. or higher as the second solvent. The colored composition for a color filter according to any one of claims 7 to 9.   The coloring composition for a color filter according to any one of claims 7 to 10, comprising a mercapto compound.   A coloring composition for a color filter comprising the color material liquid for a color filter according to any one of claims 1 to 6.   A color filter comprising a colored layer which is a cured product of a color filter coloring composition containing the color filter liquid material according to any one of claims 1 to 6.   A color filter comprising a colored layer that is a cured product of the colored composition for a color filter according to any one of claims 7 to 12.   A display device comprising the color filter according to claim 13 or 14.