JP5625302B2 - Blue pigment dispersion for color filter, blue photosensitive resin composition for color filter, color filter, and liquid crystal display device - Google Patents

Description

  The present invention relates to a blue pigment dispersion for a color filter used to form a colored layer, a blue photosensitive resin composition for a color filter, a color filter using the resin composition, and a liquid crystal provided with the color filter. The present invention relates to a display device.

A color filter used in a liquid crystal display device is generally transparent so as to partition each colored pattern with a transparent substrate, a colored layer formed on the transparent substrate and composed of colored patterns of three primary colors of red, green, and blue. And a light shielding portion formed on the substrate.
As a method for forming such a colored layer, for example, a photolithography method using a photosensitive resin composition for a colored layer containing a colorant such as a pigment or a dye is known. In addition, as a method for applying the colored layer photosensitive resin composition used in the photolithography method to the color filter substrate, the colored layer photosensitive resin composition may be applied to have a uniform film thickness. Conventionally, spin coating has been used because of its advantage of being easy. However, with the recent increase in the size of color filters, photosensitive resin compositions that become difficult to process when coating substrate for color filter becomes difficult or are shaken off when applied. Cost problems such as a large number have occurred.

Then, the application | coating by the die-coating method is examined as an application | coating method to the board | substrate for color filters of the photosensitive resin composition for colored layers.
However, since the color filter substrate is in the form of a sheet divided by the unit area where each color filter substrate can be applied, when applying the photosensitive resin composition for the colored layer by the die coating method, At the time of replacement, the discharge of the photosensitive resin composition for the colored layer from the die stops. That is, the tip of the die lip is repeatedly wetted when the colored layer photosensitive resin composition is discharged and repeatedly dried when the colored layer photosensitive resin composition is stopped. Therefore, the photosensitive resin composition for the colored layer is easily dried and solidified at the tip of the die lip, and when the dried product of the photosensitive resin composition for the colored layer adheres to the tip of the die lip, the photosensitive resin for the colored layer is subsequently attached to the substrate. When the composition is applied, there are problems that streaks are generated in the direction of the die lip and uneven coating occurs, or the dried product peels off from the tip of the die lip and moves onto the substrate, resulting in a foreign matter defect.

The problem of coating unevenness and foreign matter defects due to the dried photosensitive resin composition for the colored layer at the tip of the die lip is that the photosensitive resin composition for the colored layer once dried is included in the photosensitive resin composition for the colored layer. This occurs because it is difficult to dissolve again in the solvent (low solvent resolubility).
In order to solve the above problems, for example, a photosensitive resin composition for a colored layer containing a specific alkali-soluble resin (for example, Patent Document 1) or a photosensitive resin composition for a colored layer containing a specific solvent (for example, Patent Document) 2) has been proposed. However, in any of the methods, there is a problem that generation of a dry matter at the tip of the die lip cannot be sufficiently suppressed, and further, the dry matter once attached cannot be easily removed.

JP 2008-176218 A JP 2006-349981 A Japanese Patent Laid-Open No. 1-229014

In recent years, there has been an increasing demand for higher brightness and higher contrast of color filters, and in order to achieve such demands, there is a demand for finer pigments and stable dispersion. On the other hand, as a pigment dispersant, for example, the A block (solvent affinity part) composed of various repeating units of (meth) acrylic acid ester and the tertiary amine part of the side chain are quaternized to form a quaternary ammonium salt. An AB block copolymer composed of a B block (solvent insoluble part) composed of repeating units derived from (meth) acrylic acid esters has been proposed (for example, Patent Document 3).
While the above-mentioned pigment dispersant has very high dispersibility and dispersion stability with respect to a fine pigment, the solvent re-dissolution of the dried product of the photosensitive resin composition for the colored layer containing the pigment dispersant generated at the tip of the die lip The nature is low. This is considered to be because, in the inventors' investigation, the above-described pigment dispersant has a low solubility in the solvent used in the photosensitive resin composition for the colored layer in the portion where the B block is a quaternary ammonium salt. .

In recent years, as described above, the amount of the pigment dispersant necessary for dispersion increases with the miniaturization of the pigment, and the solvent resolubility tends to be further deteriorated.
On the other hand, when using a pigment dispersant with low dispersibility of the pigment or preparing a photosensitive resin composition using a pigment dispersant in an amount less than the amount required for dispersion, There was a problem that not only the contrast was lowered, but also the solvent re-solubility was deteriorated.

  The present invention has been made in view of the above problems, and is capable of forming a blue pigment dispersion for a color filter having excellent pigment dispersibility, a color filter having high luminance and contrast, and a color filter. When a colored layer of a color filter is formed on a substrate for coating by a die coating method, even when the dried product is generated in the die lip, the dried product can be easily removed. It is an object to provide a functional resin composition, a color filter using the resin composition, and a liquid crystal display device.

As a result of intensive studies, the present inventors have found that the pigment dispersant is responsible for reducing the solvent resolubility of the dried product of the colored layer photosensitive resin composition. And the knowledge that the said subject is solved by making the ratio of the salt formation site | part which this pigment dispersant has into a specific range was discovered, and it came to complete this invention.
That is, the blue pigment dispersion for a color filter according to the present invention contains at least a blue pigment, a pigment dispersant, and a solvent, and the pigment dispersant is a repeating unit represented by the following general formula (I) ( 1) and a repeating unit (2) represented by the following general formula (II), and 10 to 20% of amino groups out of the number m of the repeating unit (1) are allyl halide and / or Or it is the block copolymer which formed the halogenated aralkyl and salt.

[In Formula (I) and Formula (II), R ¹ is a hydrogen atom or a methyl group, R ² and R ³ are each independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, and A is a carbon atom having 1 carbon atom. To 8 alkylene groups, — [CH (R ⁶ ) —CH (R ⁷ ) —O] _x —CH (R ⁶ ) —CH (R ⁷ ) — or — [(CH ₂ ) _y —O] _z — ( A divalent group represented by CH ₂ ) _y —, R ⁴ is an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 2 to 18 carbon atoms, a benzyl group, a phenyl group, a biphenyl group, — [CH (R ⁶ ) —CH (R ⁷ ) —O] _x —R ⁸ or — [(CH ₂ ) _y —O] _z —R ⁸ . R ⁶ and R ⁷ are each independently a hydrogen atom or a methyl group, and R ⁸ is a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 2 to 18 carbon atoms, a benzyl group, a phenyl group, It is a monovalent group represented by a biphenyl group, —CHO, —CH ₂ CHO, or —CH ₂ COOR ⁹ , and R ⁹ is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.
x is an integer of 1 to 18, y is an integer of 1 to 5, and z is an integer of 1 to 18. m represents an integer of 3 to 200, and n represents an integer of 10 to 200. ]

  According to this invention, the dispersibility of a pigment can be made excellent by containing the block copolymer which has the said specific structure as a pigment dispersant in the blue pigment dispersion liquid for color filters.

  Further, the blue pigment dispersion for a color filter according to the present invention is the pigment dispersant in which the repeating unit (1) has a sum of the number m of the repeating units (1) and the number n of the repeating units (2). The ratio of several m is preferably 50 mol% or less from the viewpoint of pigment dispersibility.

  In the blue pigment dispersion for a color filter according to the present invention, the allyl halide and / or aralkyl halide comprises allyl chloride, allyl bromide, allyl iodide, benzyl chloride, benzyl bromide, and benzyl iodide. When it is at least one selected from the group, the salt-forming reaction proceeds easily, and the generated salt-forming site is excellent in adsorptivity to the pigment, so that high dispersibility can be expressed. At the same time, the heat resistance and alkali resistance of the dispersant and pattern chipping resistance during development can be increased, which is preferable.

  In the blue pigment dispersion for a color filter according to the present invention, the blue pigment contains CI Pigment Blue 15: 6 while achieving a specific color necessary for the blue colored layer of the color filter. From the viewpoint of improving brightness and contrast.

  In the blue pigment dispersion for a color filter according to the present invention, the solvent is propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether, butyl carbitol acetate, 3-methoxy-3-methyl-1-butyl acetate, 3-methoxy. One or more selected from the group consisting of butyl acetate and cyclohexanone is preferable from the viewpoints of solubility of other components and coating suitability.

The blue photosensitive resin composition for a color filter according to the present invention contains the blue pigment dispersion for the color filter according to the present invention, an alkali-soluble resin, a polyfunctional monomer, a photopolymerization initiator, and a solvent. And
The blue photosensitive resin composition for a color filter according to the present invention includes a blue pigment dispersion for a color filter according to the present invention, so that it has excellent pigment dispersibility, thereby forming a color filter with high luminance and contrast. be able to. In addition, since the pigment dispersant contained in the blue pigment dispersion is highly soluble in the solvent and excellent in pigment dispersibility, the solvent re-solubility of the dried product of the blue photosensitive resin composition can be improved. As a result, when forming a colored layer of a color filter by applying it on a color filter substrate by a die coating method, a dry matter is hardly generated and even if it occurs in a die lip, it is discharged at the next application. It dissolves easily in the solvent in the photosensitive resin composition. Further, even when a strong dry matter is generated in the die lip by long-time drying, the dry matter can be easily removed by washing with a solvent.

The color filter according to the present invention has a colored layer formed using the blue photosensitive resin composition for a color filter according to the present invention.
The liquid crystal display device according to the present invention includes the color filter according to the present invention.
According to the present invention, it is possible to provide a high-quality color filter having high luminance and contrast, less coating unevenness and foreign matter defects, and a liquid crystal display device including the color filter.

The blue pigment dispersion for a color filter of the present invention can be made excellent in pigment dispersibility by containing a block copolymer having a specific structure as a pigment dispersant.
Further, the blue photosensitive resin composition for a color filter of the present invention is excellent in pigment dispersibility by containing the blue pigment dispersion, and thus can form a color filter with high luminance and contrast, In addition, when a colored layer of a color filter is formed on a color filter substrate by applying a die coating method, the dry matter is less likely to be generated in the die lip, and even if it occurs in the die lip, the photosensitive material is discharged at the next application. It dissolves easily in the solvent in the resin composition. Further, even when a strong dry product is generated in the die lip by long-time drying, the dry product can be easily removed by washing with a solvent.
Furthermore, according to the present invention, it is possible to provide a high-quality color filter with high brightness and contrast, less coating unevenness and foreign matter defects, and a liquid crystal display device including the color filter.

It is a schematic sectional drawing which shows an example of the color filter of this invention. It is a schematic sectional drawing which shows an example of the liquid crystal display device of this invention.

Hereinafter, the blue pigment dispersion for the color filter, the blue photosensitive resin composition for the color filter, the color filter, and the liquid crystal display device of the present invention will be described in order.
In the present invention, the solvent re-solubility means the solubility in a solvent after the blue photosensitive resin composition for a color filter is once dried, for example, low solvent re-solubility. The term "blue photosensitive resin composition for color filters" means a state in which it is difficult to dissolve in a solvent once it is dried. In the present invention, the light includes electromagnetic waves having wavelengths in the visible and non-visible regions, and further includes radiation, and the radiation includes, for example, microwaves and electron beams. Specifically, it means an electromagnetic wave having a wavelength of 5 μm or less and an electron beam. In the present invention, (meth) acryl means either acryl or methacryl, (meth) acrylate means either acrylate or methacrylate, and (meth) acryloyl is , Meaning either acryloyl or methacryloyl.

1. Blue Pigment Dispersion for Color Filter The blue pigment dispersion for a color filter according to the present invention contains at least a blue pigment, a pigment dispersant, and a solvent, and the pigment dispersant is represented by the following general formula (I). The repeating unit (1) and the repeating unit (2) represented by the following general formula (II), and 10 to 50% of amino groups out of the number m of the repeating unit (1) It is a block copolymer which forms a salt with an allyl halide and / or an aralkyl halide.

[In Formula (I) and Formula (II), R ¹ is a hydrogen atom or a methyl group, R ² and R ³ are each independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, and A is a carbon atom having 1 carbon atom. To 8 alkylene groups, — [CH (R ⁶ ) —CH (R ⁷ ) —O] _x —CH (R ⁶ ) —CH (R ⁷ ) — or — [(CH ₂ ) _y —O] _z — ( A divalent group represented by CH ₂ ) _y —, R ⁴ is an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 2 to 18 carbon atoms, a benzyl group, a phenyl group, a biphenyl group, — [CH (R ⁶ ) —CH (R ⁷ ) —O] _x —R ⁸ or — [(CH ₂ ) _y —O] _z —R ⁸ . R ⁶ and R ⁷ are each independently a hydrogen atom or a methyl group, and R ⁸ is a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 2 to 18 carbon atoms, a benzyl group, a phenyl group, It is a monovalent group represented by a biphenyl group, —CHO, —CH ₂ CHO, or —CH ₂ COOR ⁹ , and R ⁹ is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.
x is an integer of 1 to 18, y is an integer of 1 to 5, and z is an integer of 1 to 18. m represents an integer of 3 to 200, and n represents an integer of 10 to 200. ]

  According to this invention, the dispersibility of a pigment can be made excellent by containing the block copolymer which has the said specific structure as a pigment dispersant in the blue pigment dispersion liquid for color filters.

The blue pigment dispersion for a color filter of the present invention contains at least a pigment dispersant, a pigment, and a solvent, and may contain other compounds as necessary.
Hereinafter, each component of the pigment dispersion of the present invention will be described in detail in order.

(Pigment dispersant)
The pigment dispersant used in the present invention has a repeating unit (1) represented by the above general formula (I) and a repeating unit (2) represented by the above general formula (II), and further the above repeating A block copolymer in which 10 to 50% of amino groups in the number m of the unit (1) form a salt with an allyl halide and / or an aralkyl halide.

Conventionally, it has been proposed to use a block copolymer composed of an A block having solubility in a solvent and a B block having a quaternary ammonium salt in the side chain as a pigment dispersant. In such a pigment dispersant, the B block has a quaternary ammonium salt, so that the adsorptivity to the pigment is enhanced. On the other hand, the A block is soluble in the solvent, thereby stabilizing the pigment in the solvent. As a result, the dispersibility and dispersion stability of the pigment can be improved. However, on the other hand, the solvent resolubility of the dried product of the colored layer photosensitive resin composition containing the pigment dispersant generated at the tip of the die lip is low.
The present inventors have found that the solvent resolubility of the dried product of the photosensitive resin composition for the colored layer can be improved by improving the solubility of the pigment dispersant in the solvent.
The reason cannot be completely clarified, but the pigment dispersant has a quaternary ammonium salt that is insoluble in the solvent contained in the photosensitive resin composition for the colored layer. If it remains without, the solubility in the solvent as a whole of the solid content of the photosensitive resin composition is lowered, and it is considered that sufficient solubility in the solvent cannot be obtained. In the process of drying the photosensitive resin composition, the solvent-soluble part of the pigment dispersant is directed to the inside of the photosensitive resin composition where the solvent remains, and the part having a solvent-insoluble quaternary ammonium salt is It is considered that the solvent is lined up on the outermost surface of the photosensitive resin composition, and once dried, it is particularly difficult to re-dissolve in the solvent. Therefore, it is considered that the dried product of the colored layer photosensitive resin composition generated at the tip of the die lip is difficult to dissolve in the solvent contained in the subsequently applied colored layer photosensitive resin composition.
In recent years, fine pigments with a large specific surface area to suppress scattered light, which are used to satisfy the demand for higher contrast, require a large amount of pigment dispersant to obtain a stable dispersion, and are photosensitive. The solvent resolubility of the resin composition tends to be further deteriorated.

The present inventors examined the structure of the pigment dispersant used in the present invention from the above viewpoint. That is, allyl halide and / or aralkyl halide is used as the salt forming agent, and the number m of repeating units (1) represented by the above general formula (I) constituting the pigment dispersant used in the present invention. The ratio of the amino group that forms a salt with the above allyl halide and / or aralkyl halide in the amino group contained in is specified within a specific range, thereby achieving a balance between the adsorptivity to the pigment and the solubility in the solvent. be able to. Thus, by optimizing the number of salt-forming sites of the pigment dispersant, the pigment dispersant can be made excellent in pigment dispersibility and solvent solubility.
Therefore, by including the block copolymer having the above specific structure as a pigment dispersant in the blue pigment dispersion of the present invention, and by making the ratio of the salt forming site the copolymer has a specific range, While the aggregation of the pigments is suppressed and the pigment dispersibility is excellent, the blue photosensitive resin composition of the present invention is further incorporated with the blue pigment dispersion to obtain a dried product of the blue photosensitive resin composition. The solvent re-solubility of can be made excellent. For this reason, when a colored layer of a color filter is formed by applying it on a color filter substrate by a die coating method, the dried product is less likely to be generated in the die lip, and even if it occurs in the die lip, it is discharged at the next application. It dissolves easily in the solvent in the resin composition. Further, even when a strong dry matter is generated in the die lip by long-time drying, the dry matter can be easily removed by washing with a solvent.

<Block copolymer>
The block copolymer has a repeating unit (1) represented by the general formula (I) and a repeating unit (2) represented by the general formula (II).
In the said general formula (I), R < ¹ > shows a hydrogen atom or a methyl group, R < ² > and R < ³ > show a hydrogen atom or a C1-C8 alkyl group each independently. Here, the alkyl group having 1 to 8 carbon atoms may be linear, branched or cyclic. Examples of such alkyl groups include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, various pentyl groups, various hexyl groups, and various octyl groups. Group, cyclopentyl group, cyclohexyl group, cyclooctyl group and the like. Among these, a methyl group and an ethyl group are preferable.
In the present invention, R ² and R ³ may be the same as or different from each other.

A is an alkylene group having 1 to 8 carbon atoms, * — [CH (R ⁶ ) —CH (R ⁷ ) —O] _x —CH (R ⁶ ) —CH (R ⁷ ) — ** or * — [( CH ₂ ) _y —O] _z — (CH ₂ ) _y — ** is a divalent group. Here, * represents a linking site on the ester bond side, and ** represents a linking site on the amino group side. The alkylene group having 1 to 8 carbon atoms may be linear or branched. For example, a methylene group, an ethylene group, a trimethylene group, a propylene group, various butylene groups, various pentylene groups, various kinds. Hexylene group and various octylene groups.
R ⁶ and R ⁷ are each independently a hydrogen atom or a methyl group.
x is an integer of 1 to 18, preferably an integer of 1 to 4, more preferably an integer of 1 to 2, and y is an integer of 1 to 5, preferably an integer of 1 to 4, more preferably 2 or 3. is there. z is an integer of 1-18, preferably an integer of 1-4, more preferably an integer of 1-2. In the present invention, if x, y, and z are within the above ranges, the blue pigment dispersion for color filters of the present invention has excellent pigment dispersibility.
As said A, a C1-C8 alkylene group is preferable and a methylene group and ethylene group are more preferable. If the carbon number is in the range of 1 to 8, the dispersibility of the pigment can be kept good.

In the general formula (II), R ⁴ represents an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 2 to 18 carbon atoms, a benzyl group, a phenyl group, a biphenyl group, — [CH (R ⁶ ) —CH (R ⁷⁾ -O] _x -R ⁸ or - indicates a _{[(CH 2) y -O]} z -R 8. In the case where R ⁴ is an aromatic ring, suitable substituents on the aromatic ring, for example, may have such linear or branched alkyl group having 1 to 4 carbon atoms.
The alkyl group having 1 to 18 carbon atoms may be linear, branched or cyclic, for example, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group. , Sec-butyl group, tert-butyl group, various pentyl groups, various hexyl groups, various octyl groups, various decyl groups, various dodecyl groups, various tetradecyl groups, various hexadecyl groups, various octadecyl groups, cyclopentyl groups, cyclohexyl groups, cyclohexane Examples include an octyl group, a cyclododecyl group, a bornyl group, an isobornyl group, a dicyclopentanyl group, an adamantyl group, and a lower alkyl group-substituted adamantyl group.
The alkenyl group having 2 to 18 carbon atoms may be linear, branched or cyclic. Examples of such alkenyl groups include vinyl groups, allyl groups, propenyl groups, various butenyl groups, various hexenyl groups, various octenyl groups, various decenyl groups, various dodecenyl groups, various tetradecenyl groups, various hexadecenyl groups, various octadecenyl groups, A cyclopentenyl group, a cyclohexenyl group, a cyclooctenyl group, etc. can be mentioned. The position of the double bond of the alkenyl group is not limited, but from the viewpoint of the reactivity of the polymer obtained, it is preferable that there is a double bond at the terminal of the alkenyl group.

R ⁶ and R ⁷ are the same as described above, and R ⁸ is a hydrogen atom or an optionally substituted alkyl group having 1 to 18 carbon atoms, an alkenyl group having 2 to 18 carbon atoms, and a benzyl group. , A phenyl group, a biphenyl group, —CHO, —CH ₂ CHO, or —CH ₂ COOR ⁹ , wherein R ⁹ is a hydrogen atom or a linear or branched group having 1 to 5 carbon atoms, Or it is a cyclic alkyl group.
In the monovalent group represented by R ⁸ , the substituent that may be included is, for example, a linear, branched or cyclic alkyl group having 1 to 4 carbon atoms, a halogen atom such as F, Cl, or Br. And so on.
The alkyl group having 1 to 18 carbon atoms and the alkenyl group having 2 to 18 carbon atoms in R ⁸ are as described for R ⁴ above.
In the above R ⁴ , x, y and z are as described in A above.
Moreover, R ⁴ in the repeating unit (2) represented by the general formula (II) may be the same as or different from each other.

In the present invention, as R ⁴ , it is preferable to use one having excellent solubility with a solvent described later, and specifically, it varies depending on the repeating unit constituting the block copolymer. In the case where the solvent is tetrahydrofuran, toluene or the like, it is preferable to use a methyl group, an ethyl group, a benzyl group or the like, and in the case where the solvent is a less polar one such as pentane or hexane, It is preferable to use a pentyl group, hexyl group, heptyl group or the like.
Here, the reason for setting the R ⁴ in this way is that the repeating unit (2) containing the R ⁴ has solubility in the solvent, the amino group of the repeating unit (1), and the halogenation described later. This is because the dispersibility and stability of the pigment can be made particularly excellent when the salt-forming site formed by allyl and / or the aralkyl halide has high adsorptivity to the pigment. .
Further, R ⁴ is substituted with a substituent such as an alkoxy group, a hydroxyl group, a carboxyl group, an amino group, an epoxy group, an isocyanate group, or a hydrogen bond-forming group as long as it does not interfere with the dispersion performance of the block copolymer. Alternatively, after the synthesis of the block copolymer, the substituent may be added by reacting with the compound having the substituent.

Regarding the molecular size of the block copolymer used in the present invention, the number m of the repeating unit (1) is an integer of 3 to 200, preferably an integer of 3 to 50. The number n of the repeating units (2) is an integer of 10 to 200, preferably an integer of 20 to 100, more preferably an integer of 20 to 70. In the present invention, when m and n are within the above ranges, the solvent-soluble part and the solvent-insoluble part effectively act, and the blue pigment dispersion for the color filter of the present invention has a pigment dispersibility. It can be excellent.
Further, the weight average molecular weight Mw of the block copolymer is preferably in the range of 500 to 20000, more preferably in the range of 1000 to 15000, and further preferably in the range of 3000 to 12000. preferable. By being within the above range, it is possible to achieve both wettability and dispersion stability with respect to the pigment in the initial stage of dispersion.

  The weight average molecular weight Mw is a value measured by GPC (gel permeation chromatography). For the measurement, HLC-8120GPC manufactured by Tosoh Corporation was used, the elution solvent was N-methylpyrrolidone to which 0.01 mol / liter of lithium bromide was added, and the polystyrene standard for calibration curve was Mw377400, 210500, 96000, 50400. , 206500, 10850, 5460, 2930, 1300, 580 (Easi PS-2 series manufactured by Polymer Laboratories) and Mw1090000 (manufactured by Tosoh Corporation), and TSK-GEL ALPHA-M × 2 (Tosoh Corporation) (Made by Co., Ltd.).

  In the block copolymer used in the present invention, the ratio of the number m of the repeating units (1) to the sum of the number m of the repeating units (1) and the number n of the repeating units (2) is 50 mol. % Or less, more preferably 5 mol% or more and 40 mol% or less. Since the ratio of the number m of the repeating unit (1) is within the above range, the ratio of the salt forming site formed by the amino group of the repeating unit (1) can be optimized. And the dispersibility of the pigment can be improved by increasing the solubility of the repeating unit (2) in the solvent described later.

  The binding order of the block copolymer used in the present invention is not particularly limited as long as it has the repeating unit (1) and the repeating unit (2) and can stably disperse the pigment described later. Although not limited, it is preferable that the repeating unit (1) is bonded to only one end of the block copolymer. That is, the repeating unit (1) and the repeating unit (2) may be bonded in the order of repeating unit (1) -repeating unit (2), or repeating unit (1) -repeating unit. (2) -repeated unit (1) may be bonded in this order, or repeating unit (1) -repeating unit (2) may be bonded repeatedly, but in the present invention, However, those bonded in the order of repeating unit (1) -repeating unit (2) are preferred. The reason is that it is excellent in the adsorptivity with respect to the pigment mentioned later, and also the aggregation of pigment dispersants using such a block copolymer can be effectively suppressed.

<Allyl halide and aralkyl halide>
The allyl halide and aralkyl halide used in the present invention have a block having the repeating unit (1) represented by the general formula (I) and the repeating unit (2) represented by the general formula (II). A salt is formed with the amino group of the repeating unit (1) of the copolymer.
In the present invention, by using the above allyl halide and / or aralkyl halide, the salt-forming site produced by the pigment dispersant is excellent in adsorptivity to the pigment, so that high dispersibility can be expressed. At the same time, the heat resistance and alkali resistance of the dispersant and the resistance to pattern chipping during development can be increased.

Examples of the allyl halide include allyl chloride, allyl bromide, and allyl iodide. Further, examples of the aralkyl group of the halogenated aralkyl include those having 7 to 18 carbon atoms, but are not particularly limited. Specific examples include benzyl chloride, benzyl bromide, benzyl iodide, naphthylmethyl chloride, pyridylmethyl chloride, naphthylmethyl bromide, pyridylmethyl bromide and the like.
Among them, the ease of salt formation reaction and the formation of the formed salt are at least one selected from the group consisting of allyl chloride, allyl bromide, allyl iodide, benzyl chloride, benzyl bromide, and benzyl iodide. It is preferable from the viewpoint that the site is excellent in the adsorptivity to the pigment, the heat resistance and alkali resistance of the dispersant, and the resistance to pattern chipping during development.

The adsorptivity of the pigment dispersant to the pigment by reacting 10 to 50% of the amino group in the number m of the repeating unit (1) with the allyl halide and / or the aralkyl halide to form a salt. The balance with the solubility with respect to a solvent can be made favorable. This is because the salt-forming site is within the above-mentioned range, and the solvent-insoluble salt-forming site is scattered in the solvent-soluble non-salt-forming amino group while ensuring the dispersibility of the pigment. The solvent-insoluble part (salt-forming part) at the time of drying is considered to be an effect obtained because it is difficult to line up on the outermost surface of the photosensitive resin composition.
Moreover, it is preferable that the ratio of the amino group which forms a salt with the said allyl halide and / or halogenated aralkyl among the number m of the said repeating unit (1) is 15 to 50%, Furthermore, it is 20 to 50%. It is preferable. If the proportion of the amino group forming the salt with the allyl halide and / or aralkyl halide is less than 10%, sufficient pigment dispersibility cannot be obtained, and if it exceeds 50%, the solubility in the solvent is reduced. There is a fear.

<Manufacture of pigment dispersant>
In the present invention, as a method for producing a block copolymer used as a pigment dispersant, the repeating unit (1) and the repeating unit (2) are included, and the repeating unit (1) has an amino group. Any method can be used as long as it can produce a salt formed with the above allyl halide and / or aralkyl halide. In the present invention, for example, the above repeating unit (1) and the repeating unit (2) are polymerized using a known polymerization means, and then dissolved or dispersed in a solvent to be described later, and then the halogenated in the solvent. A pigment dispersant can be produced by adding allyl and / or aralkyl halide and stirring.
The polymerization means is not particularly limited as long as it is a means capable of polymerizing the above repeating unit (1) and repeating unit (2) in a desired number to obtain a desired molecular weight, and has a vinyl group. A method generally used for polymerization of a compound can be employed, and for example, anionic polymerization, living radical polymerization, or the like can be used. In the present invention, among them, a method in which polymerization proceeds in a living manner, such as group transfer polymerization (GTP) disclosed in “J. Am. Chem. Soc.” 105, 5706 (1983), is used. preferable. According to this method, the molecular weight, the molecular weight distribution, etc. can be easily set in a desired range, so that the dispersibility of the pigment dispersant can be made uniform.

  In the blue pigment dispersion for a color filter of the present invention, as the pigment dispersant, one type of the block copolymer may be used, or two or more types may be used in combination. Further, the content is not particularly limited as long as it can uniformly disperse the pigment described later. For example, 15 to 120 parts by weight can be used with respect to 100 parts by weight of the pigment. . Furthermore, it is preferable to mix | blend in the ratio of 20-80 weight part with respect to 100 weight part of pigments, and it is preferable to mix | blend especially in the ratio of 15-40 weight part. If the content of the dispersant is within the above range, the insoluble part of the dispersant is less likely to be localized, and the effect of improving the solvent resolubility becomes higher.

(Pigment)
The pigment used in the present invention contains at least a blue pigment. The blue pigment is appropriately selected depending on the use and specification in the color filter, and one or more of known inorganic pigments and organic pigments are mixed and used in order to achieve the necessary chromaticity. Moreover, unless the chromaticity required for the use and specification in a color filter can be achieved and the effect of this invention is not impaired, the other pigment may be further contained.
Examples of the organic pigment include compounds classified as pigments in the color index (CI; issued by The Society of Dyers and Colorists), specifically, the following color index (C.I. .) Can be listed with numbers.

  Examples of blue pigments include C.I. Pigment Blue 15, C.I. Pigment Blue 15: 3, C.I. Pigment Blue 15: 4, C.I. Pigment Blue 15: 6, C.I. Pigment Blue 60, C.I. And CI pigment blue 80.

  Among them, C.I. I. Pigment Blue 15: 6 is preferable from the viewpoint of improving luminance and contrast while achieving a specific tint necessary for the blue colored layer of the color filter.

  The pigment used in the present invention may further contain other pigments. As other pigments, it is preferable to contain a violet pigment from the viewpoint of achieving a specific color necessary for the blue colored layer of the color filter. Examples of purple pigments include C.I. I. pigment violet 23 is preferred.

  The blending amount of the purple pigment is preferably 3 to 30% by weight, more preferably 3 to 20% by weight, based on the whole pigment. By setting it within the above range, the contrast can be improved while achieving the blue chromaticity required for the specifications of the color filter.

In addition, the dispersion average particle diameter of the pigment used in the present invention is particularly selected so long as a desired color can be formed when a colored layer of a color filter is formed using a photosensitive resin composition produced later. It is not limited, but usually it is preferably in the range of 10 nm to 300 nm, and particularly preferably in the range of 10 nm to 100 nm. This is because when a colored layer of a color filter is formed using the photosensitive resin composition using the pigment dispersant of the present invention, a colored layer having excellent luminance and contrast can be obtained.
Here, the dispersion average particle diameter in the pigment dispersion of the present invention is a dispersion average particle diameter of pigment particles dispersed in a dispersion medium containing at least a solvent, and is measured by a laser light scattering particle size distribution meter. Is. For particle size measurement using a laser light scattering particle size distribution meter, the solvent used in the pigment dispersion is appropriately diluted to a concentration that can be measured with the laser light scattering particle size distribution meter (eg, 500 times). It can be measured at 23 ° C. by a dynamic light scattering method using a laser light scattering particle size distribution meter (for example, Nanotrack particle size distribution measuring device UPA-EX150 manufactured by Nikkiso Co., Ltd.). The dispersion average particle diameter here is a volume average particle diameter.

  The pigment is preferably blended in a proportion of 5 to 25% by weight, more preferably 8 to 20% by weight, based on the total amount of the blue pigment dispersion for color filters.

(solvent)
The blue pigment dispersion for color filter according to the present invention contains a solvent for dispersing the pigment.
Examples of the solvent used in the pigment dispersion of the present invention include alcohol solvents such as methyl alcohol, ethyl alcohol, N-propyl alcohol, and i-propyl alcohol; cellosolv solvents such as methoxy alcohol and ethoxy alcohol; Carbitol solvents such as ethoxyethoxyethanol; ester solvents such as ethyl acetate, butyl acetate, methyl methoxypropionate, ethyl ethoxypropionate and ethyl lactate; ketone solvents such as acetone, methyl isobutyl ketone and cyclohexanone; methoxyethyl acetate , Propylene glycol monomethyl ether acetate, 3-methoxy-3-methyl-1-butyl acetate, 3-methoxybutyl acetate, methoxybutyl acetate, ethoxy Cellosolve acetate solvents such as til acetate and ethyl cellosolve acetate; Carbitol acetate solvents such as methoxyethoxyethyl acetate, ethoxyethoxyethyl acetate, and butyl carbitol acetate (BCA); Diethyl ether, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, propylene glycol Ether solvents such as monomethyl ether and tetrahydrofuran; aprotic amide solvents such as N, N-dimethylformamide, N, N-dimethylacetamide and N-methylpyrrolidone; lactone solvents such as γ-butyrolactone; benzene, toluene and xylene , Unsaturated hydrocarbon solvents such as naphthalene; saturated hydrocarbons such as N-heptane, N-hexane, and N-octane Organic solvents such as system solvents can be mentioned. Among these solvents, cellosolve acetate solvents such as methoxyethyl acetate, propylene glycol monomethyl ether acetate, 3-methoxy-3-methyl-1-butyl acetate, 3-methoxybutyl acetate, ethoxyethyl acetate, ethyl cellosolve acetate; Carbitol acetate solvents such as methoxyethoxyethyl acetate, ethoxyethoxyethyl acetate and butyl carbitol acetate (BCA); ether solvents such as ethylene glycol dimethyl ether, diethylene glycol dimethyl ether and propylene glycol monomethyl ether; methyl methoxypropionate and ethoxypropionic acid Ester solvents such as ethyl and ethyl lactate; ketone solvents such as cyclohexanone are preferred Used. Among them, as the solvent used in the present invention, propylene glycol monomethyl ether acetate (CH ₃ OCH ₂ CH (CH ₃ ) OCOCH ₃ ), propylene glycol monomethyl ether, butyl carbitol acetate (BCA), 3-methoxy-3-methyl- One or more selected from the group consisting of 1-butyl acetate, 3-methoxybutyl acetate and cyclohexanone is preferable from the viewpoint of solubility of other components and coating suitability.

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

(Other ingredients)
If necessary, the pigment dispersion liquid of the present invention may further contain a pigment dispersion auxiliary resin and other components.
Examples of the pigment dispersion auxiliary resin include alkali-soluble resins described later.
Other components include, for example, surfactants for improving wettability, silane coupling agents for improving adhesion, antifoaming agents, repellency inhibitors, antioxidants, anti-aggregation agents, and UV absorbers. Etc.

<Method for producing pigment dispersion>
The pigment dispersion of the present invention is prepared by mixing a pigment and a pigment dispersant in a solvent and dispersing the mixture using a known disperser. Examples of the dispersing machine for performing the dispersion treatment include roll mills such as two rolls and three rolls, ball mills such as a ball mill and a vibrating ball mill, bead mills such as a paint conditioner, a continuous disk type bead mill, and a continuous annular type bead mill. As a preferable dispersion condition of the bead mill, the bead diameter to be used is preferably 0.03 to 2.00 mm, and more preferably 0.10 to 1.0 mm.
In this way, a pigment dispersion having excellent pigment particle dispersibility is obtained. The pigment dispersion is used as a preliminary preparation for preparing a blue photosensitive resin composition for a color filter having excellent pigment dispersibility.

2. Blue photosensitive resin composition for color filter The blue photosensitive resin composition for a color filter according to the present invention includes the blue pigment dispersion according to the present invention, an alkali-soluble resin, a polyfunctional monomer, a photopolymerization initiator, and a solvent. It is characterized by containing.
The blue photosensitive resin composition for a color filter according to the present invention includes the blue pigment dispersion for a color filter according to the present invention, so that it has excellent pigment dispersibility, and thus forms a color filter with high luminance and contrast. be able to. In addition, since the pigment dispersant contained in the blue pigment dispersion is highly soluble in the solvent and excellent in pigment dispersibility, the solvent re-solubility of the dried product of the blue photosensitive resin composition can be improved. As a result, when the colored layer of the color filter is formed on the color filter substrate by the die coating method, the dried product can be easily removed even when the dried product is generated in the die lip. .

Hereinafter, components used in the blue photosensitive resin composition for a color filter of the present invention will be described.
In addition, about the component which can be contained in the blue pigment dispersion liquid for color filters which concerns on the said invention, since the thing similar to what was demonstrated in the location of the said pigment dispersion liquid can be used, description here is abbreviate | omitted. .

<Alkali-soluble resin>
As the alkali-soluble resin used in the present invention, those generally used in photosensitive resin compositions can be used, and any resin that is soluble in an alkaline aqueous solution may be used. For example, methyl (meta) Acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, sec-butyl (meth) acrylate, isobutyl (meth) acrylate, tert-butyl (meth) Acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, n-decyl (meth) acrylate, benzyl (meth) acrylate, phenyl ( Meta) Acryle Phenoxyethyl (meth) acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentanyl (meth) acrylate, 1-adamantyl (meth) acrylate, allyl (meth) acrylate, 2,2′-oxybis (Methylene) bis-2-propenoate, styrene, γ-methylstyrene, N-vinyl-2-pyrrolidone, glycidyl (meth) acrylate, 2-hydroxylethyl (meth) acrylate, 2-dimethylaminoethyl (meth) acrylate, N A dimer of (meth) acrylic acid and acrylic acid (for example, Toagosei Chemical Co., Ltd.) with at least one selected from methylmaleimide, N-cyclohexylmaleimide, N-benzylmaleimide, N-phenylmaleimide and the like M-5600 made , Itaconic acid, crotonic acid, maleic acid, fumaric acid, copolymers of the one or more selected from among vinyl acetate, and anhydrides can also be exemplified. In addition, for example, a polymer having an ethylenically unsaturated bond introduced by adding an ethylenically unsaturated compound having a reactive functional group such as a glycidyl group or a hydroxyl group to the above copolymer can be exemplified, but the present invention is not limited thereto. Is not to be done.
Among these, by adding an ethylenically unsaturated compound having a glycidyl group or a hydroxyl group to the copolymer, a polymer having an ethylenically unsaturated bond may be polymerized with a polyfunctional monomer described later at the time of exposure. This is particularly preferable in that it becomes possible and the colored layer becomes more stable.
Among these, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentanyl (meth) acrylate, 1-adamantyl (meth) acrylate, styrene, γ-methylstyrene, N-cyclohexylmaleimide, N-benzyl A polymer containing at least one selected from maleimide and N-phenylmaleimide is particularly suitable in terms of achieving both luminance and solvent resolubility.

  In the blue photosensitive resin composition for color filters of the present invention, the alkali-soluble resin may be used singly or in combination of two or more, and the content thereof is blue photosensitive for color filters. It is usually in the range of 10 to 1000 parts by weight, preferably in the range of 20 to 500 parts by weight, with respect to 100 parts by weight of the pigment contained in the resin composition. If the content of the alkali-soluble resin is too small, sufficient alkali developability may not be obtained, and if the content of the alkali-soluble resin is too large, the ratio of the pigment becomes relatively low and sufficient coloring is achieved. The concentration may not be obtained.

<Multifunctional monomer>
The polyfunctional monomer used in the present invention is not particularly limited as long as it can be polymerized by a photopolymerization initiator described later, and usually a compound having two or more ethylenically unsaturated bonds is used. A polyfunctional (meth) acrylate having two or more acryloyl groups or methacryloyl groups is preferred.

  Examples of such polyfunctional (meth) acrylates include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, hexanediol di (meth) acrylate, long chain aliphatic di (meth) acrylate, and neopentyl glycol di (Meth) acrylate, hydroxypivalate neopentyl glycol di (meth) acrylate, stearic acid modified pentaerythritol di (meth) acrylate, propylene glycol di (meth) acrylate, glycerol di (meth) acrylate, triethylene glycol di (meth) Acrylate, tetraethylene glycol di (meth) acrylate, tetramethylene glycol di (meth) acrylate, butylene glycol di (meth) acrylate, dicyclopentanyl (Meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene di (meth) acrylate, triglycerol di (meth) acrylate, neopentyl glycol modified trimethylolpropane di (meth) acrylate, allylated cyclohexyl di (meth) acrylate, Methoxylated cyclohexyl di (meth) acrylate, acrylated isocyanurate, bis (acryloxyneopentyl glycol) adipate, bisphenol A di (meth) acrylate, tetrabromobisphenol A di (meth) acrylate, bisphenol S di (meth) acrylate, Bifunctional (butanediol di (meth) acrylate, phthalic acid di (meth) acrylate, phosphoric acid di (meth) acrylate, zinc di (meth) acrylate) Data) acrylate and the like.

  Examples of trifunctional or higher polyfunctional (meth) acrylates include trimethylolpropane tri (meth) acrylate, trimethylolethane tri (meth) acrylate, glycerol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, penta Erythritol tetra (meth) acrylate, alkyl-modified dipentaerythritol tri (meth) acrylate, succinic anhydride-modified pentaerythritol tetra (meth) acrylate, tri (meth) acrylate phosphate, tris (acryloxyethyl) isocyanurate, tris (methacrylic) Roxyethyl) isocyanurate, dipentaerythritol tetra (meth) acrylate, ditrimethylolpropane tetraacrylate, alkyl-modified dipentaerythritol La (meth) acrylate, dipentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth) acrylate, alkyl-modified dipentaerythritol penta (meth) acrylate, succinic anhydride-modified dipentaerythritol penta (meth) acrylate, urethane tri (Meth) acrylate, ester tri (meth) acrylate, urethane hexa (meth) acrylate, ester hexa (meth) acrylate and the like.

These polyfunctional (meth) acrylates may be used individually by 1 type, and may be used in combination of 2 or more type. In addition, when the blue photosensitive resin composition for a color filter of the present invention requires excellent photocurability (high sensitivity), the polyfunctional monomer has three polymerizable double bonds (trifunctional). ) Or more are preferable. For example, dipentaerythritol penta (meth) acrylate and dipentaerythritol hexa (meth) acrylate are preferably used.
In the blue photosensitive resin composition for a color filter of the present invention, the content of the polyfunctional monomer is not particularly limited, but is usually about 5 to 500 parts by weight, preferably about 100 parts by weight of the alkali-soluble resin. It is in the range of 20 to 300 parts by weight. If the content of the polyfunctional monomer is less than the above range, the photocuring may not sufficiently proceed and the exposed part may be eluted, and if the content of the polyfunctional monomer is more than the above range, the alkali developability is lowered. there's a possibility that.

<Photopolymerization initiator>
There is no restriction | limiting in particular as a photoinitiator used by this invention, From the various photoinitiators known conventionally, it can select suitably and can be used. For example, aromatic ketones such as benzophenone, Michler ketone, 4,4'-bisdiethylaminobenzophenone, 4-methoxy-4'-dimethylaminobenzophenone, 2-ethylanthraquinone, phenanthrene, benzoin methyl ether, benzoin ethyl ether, benzoin phenyl ether, etc. Benzoin ethers, methylbenzoin, benzoin such as ethylbenzoin, 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, 2,4,5- 2 amount of triarylimidazole 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-oxadiazole, 2-trichloromethyl-5- (p-methoxy) Halomethyloxadiazole compounds such as styryl) -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-methoxystyrene Ryl-S-triazine, 2- (naphth-1-yl) -4,6-bis-trichloromethyl-S-triazine, 2- (4-ethoxy-naphth-1-yl) -4,6-bis-trichloro Halomethyl-S-triazine compounds such as methyl-S-triazine, 2- (4-butoxy-naphth-1-yl) -4,6-bis-trichloromethyl-S-triazine, 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, benzyl, benzoylbenzoic acid, methyl benzoylbenzoate, 4-benzoyl-4'-methyldiphe Rusulfide, 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-methylphenyl) ) 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 and the like can be mentioned. These photoinitiators may be used individually by 1 type, and may be used in combination of 2 or more type.

  In the blue photosensitive resin composition for a color filter of the present invention, the content of the photopolymerization initiator is usually about 0.01 to 100 parts by weight, preferably 5 to 60 parts by weight with respect to 100 parts by weight of the polyfunctional monomer. Part. If this content is less than the above range, the polymerization reaction cannot be sufficiently caused, so that the colored layer may not have sufficient hardness. In some cases, the content of the pigment or the like in the solid content of the conductive resin composition is relatively reduced, and a sufficient coloring density cannot be obtained.

<Other ingredients>
If necessary, the blue photosensitive resin composition for color filters according to the present invention may further contain one or more other additives. Examples of such additives include surfactants, adhesion promoters, ultraviolet absorbers, surface conditioners (leveling agents), and the like.

<Combination ratio of each component in the photosensitive resin composition>
A pigment is mix | blended in the ratio of 10 to 40 weight% with respect to the solid content whole quantity of the photosensitive resin composition, More preferably, it is 15 to 35 weight%. If the amount of the pigment is too small, the transmission density when the photosensitive resin composition is applied to a predetermined film thickness (usually 1.0 to 4.0 μm) may not be sufficient. If the amount of the pigment is too large, the photosensitive property may be insufficient. There is a possibility that the properties as a coating film such as adhesion to the substrate when the resin composition is applied and cured on the substrate, surface roughness of the cured film, and coating film hardness may be insufficient, and its photosensitivity. Since the ratio of the amount of the dispersant used for dispersing the pigment in the resin composition increases, characteristics such as developability and heat resistance may be insufficient. In addition, solid content in this invention shows components other than a solvent.
Further, the content of the pigment dispersant is preferably in the range of 1 to 60% by weight, particularly in the range of 5 to 50% by weight, based on the total solid content of the photosensitive resin composition. Is preferred. If the content is less than 1% by weight relative to the total solid content of the photosensitive resin composition, it may be difficult to uniformly disperse the pigment. If the content exceeds 60% by weight, , There is a risk of lowering curability.
Further, the content of the solvent is not particularly limited as long as the colored layer can be accurately formed. Usually, it is preferably in the range of 65 to 95% by weight, more preferably in the range of 70 to 90% by weight, based on the total amount of the photosensitive resin composition containing the solvent. When the content of the solvent is within the above range, the coating property can be excellent.

<Method for producing photosensitive resin composition>
The method for producing the blue photosensitive resin composition for a color filter of the present invention is not particularly limited as long as the pigment dispersion according to the present invention is prepared in advance and prepared using the pigment dispersion. An alkali-soluble resin, a polyfunctional monomer, a photopolymerization initiator, and other components may be added to the pigment dispersion and mixed or dispersed uniformly. Alternatively, a photosensitive component solution prepared by mixing, dispersing or dissolving an alkali-soluble resin, a polyfunctional monomer, a photopolymerization initiator, and other components with a solvent is prepared, and the prepared pigment dispersion and the photosensitive component solution are mixed. You may manufacture the blue photosensitive resin composition for color filters by mixing and performing a dispersion process as needed.
The solid content concentration based on the total weight of the blue photosensitive resin composition for a color filter of the present invention thus obtained is 5 to 30% by weight, preferably 12 to 25% by weight. By setting the solid content concentration within the above range, it can be applied as a film of a photosensitive resin composition having both desired color density and film thickness.

<Curing film for color filter>
The blue photosensitive resin composition for a color filter thus obtained is applied to the support to form a coating film, dried, and then irradiated with light in a predetermined pattern. Then, after changing the solubility between the exposed part and the unexposed part, such as selectively curing a part of the coating film, a cured film having a predetermined pattern is obtained by developing with an alkaline solution.

Ratio of transmitted luminance when the cured film of the photosensitive resin composition according to the present invention is sandwiched by combining two polarizing plates so as to be orthogonal or parallel ((luminance when polarizing plate is parallel / polarizing plate orthogonal) Brightness), also simply referred to as “contrast” in the present invention, is preferably 5500 or more, and more preferably 6000 or more.
More specifically, as the blue photosensitive resin composition, 0.135 <y <0.140 is cured in the chromaticity coordinates (x, y) in the XYZ color chromaticity diagram measured using a C light source. When the film is formed, the contrast is preferably 6000 or more.

In addition, the said contrast in this invention is a value at the time of measuring as follows more specifically.
Luminance is measured using a contrast measuring device CT-1 manufactured by Aisaka Electric (light source: F10 lamp between cold cathodes, luminance meter: LS-100 manufactured by Konica Minolta, spectral luminance meter: CS-1000T manufactured by Konica Minolta). The contrast can be derived from the following formula using the measured luminance value.
Contrast = parallel luminance (cd / m ² ) / orthogonal luminance (cd / m ² )

3. Next, the color filter of the present invention will be described. The color filter of this invention has a colored layer formed using the said blue photosensitive resin composition for color filters.

Such a color filter of the present invention will be described with reference to the drawings. FIG. 1 is a schematic sectional view showing an example of the color filter of the present invention. As illustrated in FIG. 1, the color filter 10 is formed on the transparent substrate 1, the light shielding portion 2 having a pattern formed on the transparent substrate 1, and the opening portion of the light shielding portion 2. And a colored layer 3 (3R, 3G, 3B).
Here, the blue colored layer 3B is formed using the blue photosensitive resin composition for a color filter described in the above section “2. Blue photosensitive resin composition for a color filter”.

According to the present invention, since the blue colored layer is formed using the blue photosensitive resin composition for a color filter according to the present invention, the brightness and contrast are high, coating unevenness and foreign matter defects are small. A quality color filter can be provided.
Hereinafter, each configuration of the color filter of the present invention will be described.

<Colored layer>
The colored layer 3 includes a red pattern, a green pattern, and a blue pattern arranged in a desired form such as a mosaic type, a stripe type, a triangle type, and a four colored layer arrangement type, thereby forming a display region. Moreover, the width | variety, area, etc. of a colored layer can be set arbitrarily.
The thickness of the colored layer is usually about 0.5 to 2.5 μm.

The method for forming the colored layer used in the present invention is not particularly limited as long as it can be accurately formed on the transparent substrate, but a photolithography method is usually used. In the present invention, in particular, the blue photosensitive resin composition for a color filter is applied on a transparent substrate by a die coating method, and after the applied photosensitive resin composition is dried, photolithography is performed. A method of forming by an exposure / development process in which exposure and development are performed by a method is preferred.
Specifically, first, in addition to the blue photosensitive resin composition according to the present invention, red and green photosensitive resin compositions are prepared. Next, a certain color, for example, a blue photosensitive resin composition is applied by a die coating method so as to cover the light shielding layer 2 on the transparent substrate 1 to form a photosensitive blue resin layer, and is passed through a blue pattern photomask. The blue colored layer 3B is formed by exposing to light, and after alkali development and heat curing in a clean oven or the like. Thereafter, the red and green photosensitive resin compositions are sequentially used to pattern each color in the same manner to form the red colored layer 3R and the green colored layer 3G.

  The color filter of the present invention usually has at least a transparent substrate and a light shielding part in addition to the colored layer. As such a transparent substrate and a light shielding part, those used for general color filters can be used.

  The method for producing the color filter of the present invention is not particularly limited as long as the blue colored layer is formed by a photolithography method using the blue photosensitive resin composition for a color filter. Any color filter manufacturing method can be used.

4). Next, the liquid crystal display device of the present invention will be described.
The liquid crystal display device of the present invention has the color filter of the present invention described above.
Such a liquid crystal display device of the present invention will be described with reference to the drawings. FIG. 2 is a schematic view showing an example of the liquid crystal display device of the present invention. As illustrated in FIG. 2, the liquid crystal display device 40 of the present invention includes a color filter 10, a counter substrate 20 having a TFT array substrate and the like, and a liquid crystal layer formed between the color filter 10 and the counter substrate 20. 30.
Note that the liquid crystal display device of the present invention is not limited to the configuration shown in FIG. 2 described above, and can be a configuration generally known as a liquid crystal display device using a color filter.

The driving method of the liquid crystal display device of the present invention is not particularly limited, and a driving method generally used for a liquid crystal display device can be employed. Examples of such a drive method include a TN method, an IPS method, an OCB method, and an MVA method. In the present invention, any of these methods can be preferably used.
Further, the counter substrate can be appropriately selected and used according to the driving method of the liquid crystal display device of the present invention.
Furthermore, as the liquid crystal constituting the liquid crystal layer, various liquid crystals having different dielectric anisotropy and mixtures thereof can be used according to the driving method of the liquid crystal display device of the present invention.

As a method for forming the liquid crystal layer, a method generally used as a method for manufacturing a liquid crystal cell can be used, and examples thereof include a vacuum injection method and a liquid crystal dropping method.
In the vacuum injection method, for example, a liquid crystal cell is prepared in advance using a color filter and a counter substrate, and the liquid crystal is heated to obtain an isotropic liquid, and the liquid crystal is applied to the liquid crystal cell using the capillary effect. The liquid crystal layer can be formed by injecting in this state and sealing with an adhesive. Thereafter, the sealed liquid crystal can be aligned by slowly cooling the liquid crystal cell to room temperature.
In the liquid crystal dropping method, for example, a sealant is applied to the periphery of the color filter, the color filter is heated to a temperature at which the liquid crystal becomes isotropic, and the liquid crystal is dropped in an isotropic liquid state using a dispenser or the like. In addition, the liquid crystal layer can be formed by superimposing the color filter and the counter substrate under reduced pressure and bonding them with a sealant. Thereafter, the sealed liquid crystal can be aligned by slowly cooling the liquid crystal cell to room temperature.

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

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

(Production Example 1 Preparation of Dispersant Solution a)
In a 100 mL round bottom flask, 50.6% by weight of propylene glycol monomethyl ether acetate (PGMEA), pigment dispersant (trade name: BYK-LPN6919, manufactured by Big Chemie) (average number of amino groups in one molecule of 20 mol%, solid (60% by weight) 48.5% by weight and 0.9% by weight of benzyl chloride were added and reacted at a temperature of 80 ° C. for 15 hours to obtain a solid (nonvolatile component) concentration of 30% by weight. Dispersant solution a was prepared in which the proportion of amino groups salted with benzyl chloride was 10%. The peak of benzyl chloride was not confirmed by gas chromatography, and it was judged that all of the benzyl chloride added to the reaction was consumed.

(Production Example 2 Preparation of Dispersant Solution b)
In a 100 mL round bottom flask, 51.2% by weight of propylene glycol monomethyl ether acetate (PGMEA), pigment dispersant (trade name: BYK-LPN6919, manufactured by Big Chemie) (average number of amino groups in one molecule of 20 mol%, solid (60% by weight) 47.0% by weight and 1.8% by weight of benzyl chloride were added and reacted at a temperature of 80 ° C. for 15 hours to obtain a solid (nonvolatile component) concentration of 30% by weight. Dispersant solution b was prepared in which the proportion of amino groups salted with benzyl chloride was 20%. The peak of benzyl chloride was not confirmed by gas chromatography, and it was judged that all of the benzyl chloride added to the reaction was consumed.

(Production Example 3 Preparation of Dispersant Solution c)
In a 100 mL round bottom flask, 51.8% by weight of propylene glycol monomethyl ether acetate (PGMEA), pigment dispersant (trade name: BYK-LPN6919, manufactured by Big Chemie) (average number of amino groups in one molecule: 20 mol%, solid 60% by weight) 45.6% by weight and 2.6% by weight of benzyl chloride were added and reacted at a temperature of 80 ° C. for 15 hours to obtain a solid content (nonvolatile component) concentration of 30% by weight. Dispersant solution c was prepared in which the proportion of amino groups salted with benzyl chloride was 30%. The peak of benzyl chloride was not confirmed by gas chromatography, and it was judged that all of the benzyl chloride added to the reaction was consumed.

(Production Example 4 Preparation of Dispersant Solution d)
In a 100 mL round bottom flask, 52.8% by weight of propylene glycol monomethyl ether acetate (PGMEA), pigment dispersant (trade name: BYK-LPN6919, manufactured by Big Chemie) (average number of amino groups in one molecule: 20 mol%, solid 60% by weight) 43.1% by weight and 4.1% by weight benzyl chloride were added and reacted at a temperature of 80 ° C. for 15 hours to obtain a solid content (nonvolatile component) concentration of 30% by weight. Dispersant solution d was prepared in which the proportion of amino groups salted with benzyl chloride in the group was 50%. The peak of benzyl chloride was not confirmed by gas chromatography, and it was judged that all of the benzyl chloride added to the reaction was consumed.

(Production Example 5 Preparation of Dispersant Solution e)
In a 100 mL round bottom flask, 53.6% by weight of propylene glycol monomethyl ether acetate (PGMEA), a pigment dispersant (trade name: BYK-LPN6919, manufactured by Big Chemie) (average number of amino groups in one molecule: 20 mol%, solid 60% by weight) 40.9% by weight and 5.5% by weight benzyl chloride were added and reacted at a temperature of 80 ° C. for 15 hours, so that the solid content (nonvolatile component) concentration was 30% by weight. Dispersant solution e was prepared in which the proportion of amino groups salted with benzyl chloride was 70%. The peak of benzyl chloride was not confirmed by gas chromatography, and it was judged that all of the benzyl chloride added to the reaction was consumed.

(Production Example 6 Preparation of Dispersant Solution f)
In a 100 mL round bottom flask, 54.4% by weight of propylene glycol monomethyl ether acetate (PGMEA), pigment dispersant (trade name: BYK-LPN6919, manufactured by Big Chemie) (average number of amino groups in one molecule: 20 mol%, solid 60% by weight) 38.9% by weight and 6.7% by weight of benzyl chloride were added and reacted at a temperature of 80 ° C. for 15 hours to obtain a solid content (nonvolatile component) concentration of 30% by weight. Dispersant solution f was prepared in which the proportion of amino groups salted with benzyl chloride in the group was 90%. The peak of benzyl chloride was not confirmed by gas chromatography, and it was judged that all of the benzyl chloride added to the reaction was consumed.

(Production Example 7 Preparation of Dispersant Solution g)
In a 100 mL round bottom flask, 50.6% by weight of propylene glycol monomethyl ether acetate (PGMEA), pigment dispersant (trade name: BYK-LPN6919, manufactured by Big Chemie) (average number of amino groups in one molecule of 20 mol%, solid (60% by weight) 48.5% by weight and 0.9% by weight of allyl bromide were added and stirred at room temperature for 2 hours, so that the solid content (nonvolatile component) concentration was 30% by weight, and the amino group contained in the dispersant. Among them, a dispersant solution g in which the ratio of allyl bromide and the amino group salt-formed was 10% was prepared. The peak of allyl bromide was not confirmed by gas chromatography, and it was judged that all the allyl bromide added to the reaction was consumed.

(Production Example 8 Preparation of Dispersant Solution h)
In a 100 mL round bottom flask, 51.2% by weight of propylene glycol monomethyl ether acetate (PGMEA), pigment dispersant (trade name: BYK-LPN6919, manufactured by Big Chemie) (average number of amino groups in one molecule of 20 mol%, solid (60% by weight) 47.1% by weight and 1.7% by weight of allyl bromide were added and stirred at room temperature for 2 hours, so that the solid content (non-volatile component) concentration was 30% by weight. Among them, a dispersant solution h in which the ratio of allyl bromide to the salt-forming amino group was 20% was prepared. The peak of allyl bromide was not confirmed by gas chromatography, and it was judged that all the allyl bromide added to the reaction was consumed.

(Production Example 9 Preparation of Dispersant Solution i)
In a 100 mL round bottom flask, 52.6% by weight of propylene glycol monomethyl ether acetate (PGMEA), pigment dispersant (trade name: BYK-LPN6919, manufactured by Big Chemie) (average number of amino groups in one molecule: 20 mol%, solid 60 wt%) 43.4 wt% and allyl bromide 4.0 wt% were added and stirred at room temperature for 2 hours, so that the solid content (nonvolatile component) concentration was 30 wt%. Dispersant solution i was prepared in which the ratio of allyl bromide to the salt-forming amino group was 50%. The peak of allyl bromide was not confirmed by gas chromatography, and it was judged that all the allyl bromide added to the reaction was consumed.

(Production Example 10 Preparation of Dispersant Solution j)
In a 100 mL round bottom flask, 53.5% by weight of propylene glycol monomethyl ether acetate (PGMEA), pigment dispersant (trade name: BYK-LPN6919, manufactured by Big Chemie) (average number of amino groups in one molecule: 20 mol%, solid (60% by weight) 41.2% by weight and 5.3% by weight of allyl bromide were added and stirred at room temperature for 2 hours, so that the solid content (nonvolatile component) concentration was 30% by weight. Dispersant solution j was prepared in which the ratio of allyl bromide to the salt-forming amino group was 70%. The peak of allyl bromide was not confirmed by gas chromatography, and it was judged that all the allyl bromide added to the reaction was consumed.

(Production Example 11 Preparation of Dispersant Solution k)
In a 100 mL round bottom flask, 54.3% by weight of propylene glycol monomethyl ether acetate (PGMEA), a pigment dispersant (trade name: BYK-LPN6919, manufactured by Big Chemie) (average number of amino groups in one molecule of 20 mol%, solid (60% by weight) 39.2% by weight and 6.5% by weight of allyl bromide were added and stirred at room temperature for 2 hours to obtain a solid content (nonvolatile component) concentration of 30% by weight. Dispersant solution k in which the ratio of amino groups salted with allyl bromide was 90% was prepared. The peak of allyl bromide was not confirmed by gas chromatography, and it was judged that all the allyl bromide added to the reaction was consumed.

( Reference Example 1 )
(1) Preparation of Blue Pigment Dispersion for Color Filter Prepared in Production Example 1 with respect to 10 parts by weight of fine pigment (CI Pigment Blue 15: 6 (PB15: 6: average primary particle size 15 to 40 nm)) 13.3 parts by weight of the dispersant solution a (solid content 30% by weight) and an alkali-soluble resin (styrene / cyclohexyl methacrylate / acrylic acid / 2-hydroxymethyl acrylate copolymer (molar ratio 30/40/10/20, acid value: 70 mgKOH / g, and a molecular weight 6000) 4 parts by weight, by mixing a solvent PGMEA72.2 parts, 2 mm zirconia beads for 1 hour, and 6 hours dispersed further in 0.1mm zirconia beads by a paint shaker, reference example A blue pigment dispersion A for color filter 1 was obtained, and the bead filling rate in the vessel at the time of dispersion was 50%.

(2) Preparation of blue photosensitive resin composition for color filter To 15 parts by weight of the blue pigment dispersion A obtained above, 20 parts by weight of the following binder composition and 30 parts by weight of solvent PGMEA were added, followed by pressure filtration. The blue photosensitive resin composition A for color filters of Reference Example 1 was obtained.
<Binder composition>
Alkali-soluble resin (styrene / cyclohexyl methacrylate / acrylic acid / 2-hydroxymethyl acrylate copolymer (molar ratio 30/40/10/20, acid value: 70 mg KOH / g, molecular weight 6000)): 10 parts by weight Acrylate monomer (trade name: Aronix M450, manufactured by Toagosei Co., Ltd.): 15 parts by weight-photopolymerization initiator (2-methyl-1 [4- (methylthio) phenyl] -2-morpholinopropan-1-one (Product name: Irgacure 907, manufactured by Ciba Specialty Chemicals Co., Ltd.): 4 parts by weight, photosensitizer (2,4-diethylthioxanthone (trade name: Kayacure DETX-S, manufactured by Nippon Kayaku Co., Ltd.)) : 2 parts by weight / solvent (propylene glycol monomethyl ether acetate): 50 parts by weight

(Examples 2 , 5, 6 and Reference Examples 1-3 )
(1) Preparation of blue pigment dispersion for color filter
In Reference Example 1 , in the same manner as in Reference Example 1 except that the dispersant solutions b to d and g to i were used in place of the dispersant solution a, blue pigment dispersions B to D for color filters, And GI were obtained.
(2) Preparation of blue photosensitive resin composition for color filter
In Reference Example 1 , a blue photosensitive resin composition for a color filter was prepared in the same manner as in Reference Example 1 except that blue pigment dispersions B to D and G to I were used instead of blue pigment dispersion A, respectively. BD and GI were obtained.

(Comparative Examples 1-4)
(1) Preparation of blue pigment dispersion for color filter
In Reference Example 1 , blue pigment dispersions E, F, and J for color filters were used in the same manner as in Reference Example 1 except that dispersant solutions e, f, j, and k were used instead of dispersant solution a. , K was obtained.
(2) Preparation of blue photosensitive resin composition for color filter
In Reference Example 1 , a blue photosensitive resin composition E for color filters was used in the same manner as in Reference Example 1 , except that blue pigment dispersions E, F, J, and K were used instead of blue pigment dispersion A, respectively. , F, J, K were obtained.

(Comparative Example 5)
(1) Preparation of Blue Pigment Dispersion for Color Filter The pigment dispersant (commercial product) is used for 10 parts by weight of fine pigment (CI Pigment Blue 15: 6 (PB15: 6: average primary particle size 15 to 40 nm)). Name: BYK-LPN6919, manufactured by Big Chemie) (average number of amino groups in one molecule 20 mol%, solid content 60 wt%) 6.7 parts by weight and alkali-soluble resin (styrene / cyclohexyl methacrylate / acrylic acid / 2-hydroxymethyl) 4 parts by weight of an acrylate copolymer (molar ratio 30/40/10/20, acid value: 70 mg KOH / g, molecular weight 6000) and 79.3 parts by weight of the solvent PGMEA are mixed, and 1 mm with 2 mm zirconia beads in a paint shaker. Disperse for 6 hours with 0.1 mm zirconia beads for further time, and a blue pigment dispersion L for a color filter of Comparative Example 5 Obtained. Incidentally, the packing ratio of the beads in the vessel during dispersion was 50%.
(2) Preparation of blue photosensitive resin composition for color filter
In Reference Example 1 , a blue photosensitive resin composition L for a color filter was obtained in the same manner as in Reference Example 1 , except that the blue pigment dispersion L was used instead of the blue pigment dispersion A.

(Evaluation)
(1) Evaluation of Pigment Dispersion The dispersion average particle diameter of pigment particles was measured for the blue pigment dispersion for color filters obtained in each Example , Reference Example and Comparative Example. The dispersion average particle diameter was measured at 23 ° C. by a dynamic light scattering method using a Nanotrac particle size distribution analyzer UPA-EX150 manufactured by Nikkiso Co., Ltd. after diluting the pigment dispersion with propylene glycol monomethyl ether acetate 1000 times.
(2) Evaluation of photosensitive resin composition <Contrast>
The blue photosensitive resin composition for a color filter obtained in each example , reference example and comparative example was placed on a 0.7 mm-thick glass substrate (NH Techno Glass Co., Ltd., “NA35”) with a spin coater. Applied. Then, it heat-dried for 3 minutes on an 80 degreeC hotplate. A cured film (blue colored layer) was obtained by exposure (60 mJ) using a small aligner. The film thickness after drying and curing was adjusted so that the target chromaticity y = 0.138.
Luminance was measured using a contrast measuring device CT-1 manufactured by Aisaka Electric Co., Ltd., light source: F10 lamp between cold cathodes, luminance meter: LS-100 manufactured by Konica Minolta, and spectral luminance meter: CS-1000T manufactured by Konica Minolta. The contrast can be derived from the following formula using the measured luminance value.
Contrast = parallel luminance (cd / m ² ) / orthogonal luminance (cd / m ² )
The results are shown in Table 1.
<Solvent resolvability>
As an alternative method for evaluating the presence or absence of coating unevenness and foreign matter defects in the die coating method, solvent resolubility evaluation of the dried coating film was performed. As an evaluation method, a glass substrate cut into a length of 100 mm and a width of 5 mm was prepared, and the glass substrate was immersed in each of the photosensitive resin compositions up to a length of 2 cm and pulled up at 23 ° C. and 80%. It was dried with a constant temperature and humidity layer of RH. Next, the glass substrate to which the dried coating film adhered was immersed in PGMEA, and the glass substrate was stirred for 15 seconds. At this time, the redissolved state of the dried coating film was visually evaluated in the following three stages. The results are shown in Table 1.
・ ○: Dried film completely dissolves during immersion and stirring. Δ: Small amount of insoluble matter (less than 10) remains after stirring for 15 seconds. ×: Large amount of insoluble matter (more than 10) remains after stirring for 15 seconds.

Table 1 shows the following.
In Examples 1, 2, 5, 6 and Reference Examples 1 to 3 using the pigment dispersant of the present invention, the dispersion average particle diameter of the pigment particles in the pigment dispersion is in the range of 35 to 50 nm, and the pigment dispersibility is It was good. Also, the contrast after post-baking was high. Furthermore, when the dried coating film obtained in each Example was immersed in a solvent and stirred, all of them were dissolved, and excellent solvent resolubility was exhibited.
In contrast, Comparative Examples 1 and 3 in which the ratio of the salt-forming agent and the salt-forming amino group out of the amino groups of the pigment dispersant exceeds the upper limit of the present invention are the same as in Examples in pigment dispersibility and contrast. Although the obtained dried coating film was immersed in a solvent for 15 seconds, the dried coating film remained undissolved. Further, in Comparative Examples 2 and 4 in which the proportion of amino groups that formed a salt in the amino groups of the pigment dispersant further increased (90%), when the obtained dried coating film was immersed in a solvent, a larger amount of insoluble matter was produced. The solvent re-solubility deteriorated. Further, Comparative Example 5 using a pigment dispersant that does not salt-form amino groups with salt-formers dissolved all of the obtained dried coating film when immersed in a solvent, and showed excellent solvent re-solubility. Dispersibility and contrast were low compared to the examples.

DESCRIPTION OF SYMBOLS 1 Transparent substrate 2 Light-shielding part 3 (3R, 3G, 3B) Colored layer 10 Color filter 20 Opposite substrate 30 Liquid crystal layer 40 Liquid crystal display device

Claims (8)

It contains at least a blue pigment, a pigment dispersant, and a solvent. The pigment dispersant is a repeating unit (1) represented by the following general formula (I) and a repeating unit represented by the following general formula (II): And a block copolymer in which 10 to 20% of amino groups in the number m of the repeating unit (1) form a salt with an allyl halide and / or an aralkyl halide. A blue pigment dispersion for color filters.

[In Formula (I) and Formula (II), R ¹ is a hydrogen atom or a methyl group, R ² and R ³ are each independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, and A is a carbon atom having 1 carbon atom. To 8 alkylene groups, — [CH (R ⁶ ) —CH (R ⁷ ) —O] _x —CH (R ⁶ ) —CH (R ⁷ ) — or — [(CH ₂ ) _y —O] _z — ( A divalent group represented by CH ₂ ) _y —, R ⁴ is an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 2 to 18 carbon atoms, a benzyl group, a phenyl group, a biphenyl group, — [CH (R ⁶ ) —CH (R ⁷ ) —O] _x —R ⁸ or — [(CH ₂ ) _y —O] _z —R ⁸ . R ⁶ and R ⁷ are each independently a hydrogen atom or a methyl group, and R ⁸ is a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 2 to 18 carbon atoms, a benzyl group, a phenyl group, It is a monovalent group represented by a biphenyl group, —CHO, —CH ₂ CHO, or —CH ₂ COOR ⁹ , and R ⁹ is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.
x is an integer of 1 to 18, y is an integer of 1 to 5, and z is an integer of 1 to 18. m represents an integer of 3 to 200, and n represents an integer of 10 to 200. ]   In the pigment dispersant, the ratio of the number m of the repeating units (1) to the sum of the number m of the repeating units (1) and the number n of the repeating units (2) is 50 mol% or less. The blue pigment dispersion for a color filter according to claim 1.   The allyl halide and / or aralkyl halide is at least one selected from the group consisting of allyl chloride, allyl bromide, allyl iodide, benzyl chloride, benzyl bromide, and benzyl iodide. The blue pigment dispersion for a color filter according to claim 1 or 2.   The blue pigment dispersion for a color filter according to any one of claims 1 to 3, wherein the blue pigment contains CI Pigment Blue 15: 6.   The solvent is one or more selected from the group consisting of propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether, butyl carbitol acetate, 3-methoxy-3-methyl-1-butyl acetate, 3-methoxybutyl acetate and cyclohexanone. The blue pigment dispersion for a color filter according to any one of claims 1 to 4, wherein the dispersion is a blue pigment dispersion.   6. A color filter for a color filter comprising the blue pigment dispersion for a color filter according to any one of claims 1 to 5, an alkali-soluble resin, a polyfunctional monomer, a photopolymerization initiator, and a solvent. Blue photosensitive resin composition.   A color filter comprising a colored layer formed using the blue photosensitive resin composition for a color filter according to claim 6.   A liquid crystal display device comprising the color filter according to claim 7.

Images