JPWO2016136921A1 - Pigment fine particles, pigment dispersion, photosensitive coloring composition and color filter - Google Patents

Abstract

To provide a diketopyrrolopyrrole pigment fine particle having excellent heat resistance, good color characteristics, and suitable for production of a color filter capable of being thinned, a pigment dispersion containing the pigment fine particle, a photosensitive coloring composition, and a color filter. Is an issue. The crystallite size in the plane direction corresponding to the maximum peak in the X-ray diffraction pattern among the eight planes (± 1 ± 1 ± 1) of the crystal lattice plane calculated by the X-ray diffraction pattern is 140 mm or less. Provided are diketopyrrolopyrrole pigment fine particles containing a compound represented by the general formula (I). Also provided are a pigment dispersion containing the fine pigment particles, a photosensitive coloring composition, and a color filter. [In the above general formula (I), X1 and X2 are each independently a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, —CF3, or a saturated or unsaturated group which may have a substituent. A saturated alkyl group or an aryl group which may have a substituent is shown. ]

Description

The present invention relates to novel pigment fine particles, a pigment dispersion using the same, a photosensitive coloring composition, and a color filter.

Color filters used in liquid crystal display devices and solid-state imaging devices are generally applied to glass substrates, silicon substrates, etc., by adding a colored composition in which a dye or pigment coloring material is dissolved or dispersed in a solvent to a resin. Then, it is manufactured through steps such as exposure / curing, development, and heat curing. Since the durability of the color filter is related to the life of the liquid crystal display device and the solid-state imaging device, a pigment dispersion method using a pigment having excellent heat resistance and solvent resistance as the coloring material of the coloring composition has become the mainstream. The pigment dispersion used here is mainly a non-aqueous pigment dispersion in which a pigment is dispersed in an organic solvent. The primary particle size, dispersed particle size, crystallinity, etc. of the pigment fine particles contained in the dispersion are used. The characteristics greatly affect the performance such as the color characteristics of the final color filter.

In recent years, color filters used in liquid crystal display devices and solid-state imaging devices are required to have high definition and power saving. In order to achieve these, the color characteristics of the color filter are strongly required to have characteristics such as higher contrast, higher luminance, and higher coloring power.

As the organic pigment used for the colorant for the red filter segment, an organic pigment having excellent light resistance and heat resistance such as a diketopyrrolopyrrole pigment, an anthraquinone pigment, or a disazo pigment is generally used alone or in combination. However, these commercially available organic pigments have a large primary particle size and are non-uniform, so that even if they are used as they are, it is impossible to achieve the color characteristics required for color filters.
For this reason, many attempts have been made to refine these organic pigments.

In particular, diketopyrrolopyrrole pigments have recently been favorably used as organic pigments having excellent luminance. I. Since pigment red 254 and brominated diketopyrrolopyrrole are organic pigments that are particularly excellent in color characteristics, studies have been actively made on miniaturization (hereinafter also referred to as “fine particle formation”).

For example, as described in Patent Documents 1 and 2, so-called salt milling in which an inorganic salt such as sodium chloride is used as a medium, an organic pigment and an organic solvent are premixed, and the mixture is processed in a kneader to pulverize the organic pigment. Fine particles obtained by mixing a solution obtained by dissolving an organic pigment in a good solvent, as described in JP-A No. 2004-86128, JP-A No. 2004-230, There has been proposed a so-called reprecipitation method for generating selenium or a method for refining an organic pigment by combining a reprecipitation method and a salt milling method as described in Patent Document 6.

Further, as described in Patent Document 7, a thin film fluid formed between at least two processing surfaces disposed opposite to each other and capable of approaching / separating at least one rotating relative to the other. There is provided a method for producing fine particles, in which a pigment solution in which an organic pigment is dissolved and a precipitation solvent for precipitating organic pigment fine particles are mixed.

JP 2012-21970 A JP 2014-177532 A JP 2011-046846 A JP 2011-137142 A International Publication WO2011 / 024896 Pamphlet Japanese Patent Laying-Open No. 2015-102858 International publication WO2011-096401 pamphlet

By using fine organic pigment particles that are refined by applying these conventional techniques, there can be a certain effect on color filter performance such as high contrast and high brightness. However, as a result of studies by the present inventors, none of those obtained by these conventional techniques have yet fully satisfied the high contrast and high luminance required for color filters. And Patent Document 5 and the like add substances other than color materials, so that organic pigment fine particles and dispersions thereof can be obtained that can obtain a color filter with high contrast and high coloring power that has been strongly demanded in recent years. Not.

The problem to be solved by the present invention is a high-contrast and high-brightness diketopyrrolopyrrole pigment fine particle, and when a pigment dispersion containing the pigment fine particle is used, a good filter segment is formed. It is an object of the present invention to provide a photosensitive coloring composition having a required performance and an excellent balance of the performance, and a high-definition color filter excellent in contrast and brightness using the same.

As a result of intensive studies, the inventors have confirmed that crystals of diketopyrrolopyrrole pigments are mainly grown in three directions. In particular, the crystallite size in a specific crystal growth direction is below a certain value. The diketopyrrolopyrrole pigment having a certain or specific crystallite size ratio within a certain range with respect to each crystal growth direction has a fine and uniform primary particle diameter, and is required when used as a color filter. It was found that the characteristics of the above were satisfied in a balanced manner at a high level.

The present invention has been solved by the following means.
(1) The crystallite size in the plane direction corresponding to the maximum peak in the X-ray diffraction pattern among the eight surfaces (± 1 ± 1 ± 1) of the crystal lattice planes calculated by the X-ray diffraction pattern is 140Å. Diketopyrrolopyrrole pigment fine particles containing 90% or more of a compound represented by the following general formula (I):
[In the above general formula (I), X ₁ and X ₂ may each independently have a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, —CF ₃ , or a substituent. A saturated or unsaturated alkyl group or an aryl group which may have a substituent is shown. ]
(2) The crystallite size in the plane direction corresponding to the maximum peak in the X-ray diffraction pattern among the eight planes (± 1 ± 1 ± 1) of the crystal lattice planes calculated from the X-ray diffraction pattern is 140 mm. Diketopyrrolopyrrole pigment fine particles containing a compound represented by the general formula (I) having a crystallite size in the (1 5 -1) plane direction of 80 mm or less, which is calculated by an X-ray diffraction pattern.
(3) The crystallite size in the plane direction corresponding to the maximum peak in the X-ray diffraction pattern among the eight crystal lattice planes (± 1 ± 1 ± 1) calculated by the X-ray diffraction pattern is expressed by X-ray diffraction. The crystallite size ratio calculated by dividing the crystal lattice plane calculated by the pattern by the crystallite size in the plane direction corresponding to the maximum peak at 2θ = 3 to 10 ° is 0.85 to 1.25. Diketopyrrolopyrrole pigment fine particles containing a compound represented by the general formula (I), wherein the average primary particle diameter is 5 to 40 nm.
(4) The crystallite size of the crystal lattice plane corresponding to 2θ = 24.5 ° ± 0.3 ° calculated from the X-ray diffraction pattern is 140 mm or less, and 90% of the compound represented by the general formula (I) Diketopyrrolopyrrole pigment fine particles contained above.
(5) The crystallite size of the crystal lattice plane corresponding to 2θ = 24.5 ° ± 0.3 ° calculated from the X-ray diffraction pattern is 140Å or less, and 2θ = 28. Diketopyrrolopyrrole pigment fine particles containing 90% or more of the compound represented by the general formula (I), wherein the crystallite size of the crystal lattice plane corresponding to 0 ° ± 0.3 ° is 80 mm or less .
(6) The diketopyrrolopyrrole pigment fine particles according to the above (1), (2), (4) or (5) having an average primary particle diameter of 5 to 40 nm.
(7) The crystallite size of the crystal lattice plane corresponding to 2θ = 24.5 ° ± 0.3 ° calculated by the X-ray diffraction pattern is 2θ = 7.4 ° ± 0 calculated by the X-ray diffraction pattern. A ratio of crystallite sizes calculated by dividing by a crystallite size of a crystal lattice plane corresponding to 3 ° is 0.85 to 1.25, and an average primary particle size is 5 to 40 nm. Diketopyrrolopyrrole pigment fine particles containing a compound represented by the general formula (I).
(8) The rate of change between the value at 80 ° C. and the value at 230 ° C. (according to the following specific formula) of the crystal lattice plane corresponding to the maximum peak at 2θ = 3 to 10 ° calculated from the X-ray diffraction pattern. The diketopyrrolopyrrole pigment fine particles according to any one of (1) to (7) above, which are 3.0% or less.
The rate of change between the value at 80 ° C. and the value at 230 ° C. =
{(Planar spacing at 230 ° C.) / (Planar spacing at 80 ° C.) × 100} −100 (%) [specific formula]
(9) The rate of change between the value at 80 ° C. and the value at 230 ° C. of the crystal lattice plane corresponding to 2θ = 7.4 ° ± 0.3 ° calculated from the X-ray diffraction pattern (according to the following specific formula) ) Is 3.0% or less, The diketopyrrolopyrrole pigment fine particles according to any one of the above (1) to (7).
The rate of change between the value at 80 ° C. and the value at 230 ° C. =
{(Planar spacing at 230 ° C.) / (Planar spacing at 80 ° C.) × 100} −100 (%) [specific formula]

(10) The diketopyrrolopyrrole pigment fine particles according to any one of (1) to (9) above, wherein the standard deviation of the primary particle diameter is less than 7.0.
(11) The diketopyrrolopyrrole pigment fine particles according to any one of (1) to (10), wherein the coefficient of variation (CV value) of the primary particle diameter is less than 30.
(12) The diketopyrrolopyrrole pigment fine particles according to any one of (1) to (11) above, wherein the Fe content is 35 ppm or less.
(13) The diketopyrrolopyrrole pigment fine particles according to any one of (1) to (12) above, wherein the general formula (I) is represented by the following general formula (II).
[In the general formula (II), each R independently represents a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, —CF ₃ , or a saturated or unsaturated group that may have a substituent. Or an aryl group which may have a substituent. ]
(14) The diketopyrrolopyrrole pigment fine particles according to the above (13), which are represented by the following formula (III), wherein R is bromine.
(15) The crystallite size in the plane direction corresponding to the maximum peak in the X-ray diffraction pattern among 140 planes (± 1 ± 1 ± 1) of the crystal lattice planes calculated by the X-ray diffraction pattern is 140 mm. Diketopyrrolopyrrole pigment fine particles containing a compound represented by the formula (III):
(16) A pigment dispersion containing at least an organic pigment and an organic solvent, wherein the organic pigment is the diketopyrrolopyrrole pigment fine particles according to any one of (1) to (15) above. Characteristic pigment dispersion.
(17) A photosensitive coloring composition containing at least the pigment fine particles according to any one of (1) to (15).
(18) A color filter containing at least the photosensitive coloring composition according to (17).
(19) A color filter containing at least the pigment fine particles according to any one of (1) to (15).

According to the present invention, there are provided a diketopyrrolopyrrole pigment fine particle having the characteristics of any one of (1) to (15) above, a pigment dispersion containing the pigment fine particle, a photosensitive coloring composition, and a color filter. Can be provided. By using the pigment fine particles, it is possible to easily disperse even though they are fine particles, and when using a pigment dispersion containing the pigment fine particles, as a color filter application having high contrast, high coloring power, and excellent heat resistance. It has become possible to provide a photosensitive coloring composition having very suitable performance, and a color filter excellent in contrast and brightness using the photosensitive coloring composition.

It is a schematic sectional drawing of the fluid processing apparatus used for implementation of the fluid processing method which concerns on embodiment of this invention. (A) is a schematic plan view of a first processing surface of the fluid processing apparatus shown in FIG. 1, and (B) is an enlarged view of a main part of the processing surface of the apparatus. (A) is sectional drawing of the 2nd introducing | transducing part of the apparatus, (B) is the principal part enlarged view of the processing surface for demonstrating the 2nd introducing | transducing part. Brominated diketopyrrolopyrrole and C.I. I. It is an X-ray diffraction pattern diagram of Pigment Red 254. Brominated diketopyrrolopyrrole and C.I. I. It is the schematic diagram which looked at the said zigzag in the laminated structure of the Sayaka pattern where the surface of the aromatic ring in the crystal | crystallization of Pigment Red 254 became zigzag from diagonally upward. Brominated diketopyrrolopyrrole and C.I. I. It is the schematic diagram which looked at the said zigzag from right side in the laminated structure of the Sayaka pattern where the surface of the aromatic ring in the crystal | crystallization of Pigment Red 254 became zigzag. It is a schematic diagram which shows the relationship between a secondary particle, a primary particle, a crystallite, and a crystal plane.

Hereinafter, preferred embodiments of the present invention will be described, but the present invention should not be construed as being limited thereto.

The diketopyrrolopyrrole pigment fine particles in the present invention have any of the following characteristics (1) to (15).
(1) The crystallite size in the plane direction corresponding to the maximum peak in the X-ray diffraction pattern among the eight surfaces (± 1 ± 1 ± 1) of the crystal lattice planes calculated by the X-ray diffraction pattern is 140Å. Diketopyrrolopyrrole pigment fine particles containing 90% or more of a compound represented by the following general formula (I):
[In the above general formula (I), X ₁ and X ₂ may each independently have a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, —CF ₃ , or a substituent. A saturated or unsaturated alkyl group or an aryl group which may have a substituent is shown. ]
(2) The crystallite size in the plane direction corresponding to the maximum peak in the X-ray diffraction pattern among the eight planes (± 1 ± 1 ± 1) of the crystal lattice planes calculated from the X-ray diffraction pattern is 140 mm. Diketopyrrolopyrrole pigment fine particles containing a compound represented by the general formula (I) having a crystallite size in the (1 5 -1) plane direction of 80 mm or less, which is calculated by an X-ray diffraction pattern.
(3) The crystallite size in the plane direction corresponding to the maximum peak in the X-ray diffraction pattern among the eight crystal lattice planes (± 1 ± 1 ± 1) calculated by the X-ray diffraction pattern is expressed by X-ray diffraction. The crystallite size ratio calculated by dividing the crystal lattice plane calculated by the pattern by the crystallite size in the plane direction corresponding to the maximum peak at 2θ = 3 to 10 ° is 0.85 to 1.25. Diketopyrrolopyrrole pigment fine particles containing a compound represented by the general formula (I), wherein the average primary particle diameter is 5 to 40 nm.
(4) The crystallite size of the crystal lattice plane corresponding to 2θ = 24.5 ° ± 0.3 ° calculated from the X-ray diffraction pattern is 140 mm or less, and 90% of the compound represented by the general formula (I) Diketopyrrolopyrrole pigment fine particles contained above.
(5) The crystallite size of the crystal lattice plane corresponding to 2θ = 24.5 ° ± 0.3 ° calculated from the X-ray diffraction pattern is 140Å or less, and 2θ = 28. Diketopyrrolopyrrole pigment fine particles containing 90% or more of the compound represented by the general formula (I), wherein the crystallite size of the crystal lattice plane corresponding to 0 ° ± 0.3 ° is 80 mm or less .
(6) The diketopyrrolopyrrole pigment fine particles according to the above (1), (2), (4) or (5) having an average primary particle diameter of 5 to 40 nm.
(7) The crystallite size of the crystal lattice plane corresponding to 2θ = 24.5 ° ± 0.3 ° calculated by the X-ray diffraction pattern is 2θ = 7.4 ° ± 0 calculated by the X-ray diffraction pattern. A ratio of crystallite sizes calculated by dividing by a crystallite size of a crystal lattice plane corresponding to 3 ° is 0.85 to 1.25, and an average primary particle size is 5 to 40 nm. Diketopyrrolopyrrole pigment fine particles containing a compound represented by the general formula (I).
(8) The rate of change between the value at 80 ° C. and the value at 230 ° C. (according to the following specific formula) of the crystal lattice plane corresponding to the maximum peak at 2θ = 3 to 10 ° calculated from the X-ray diffraction pattern. The diketopyrrolopyrrole pigment fine particles according to any one of (1) to (7) above, which are 3.0% or less.
The rate of change between the value at 80 ° C. and the value at 230 ° C. =
{(Planar spacing at 230 ° C.) / (Planar spacing at 80 ° C.) × 100} −100 (%) [specific formula]
(9) The rate of change between the value at 80 ° C. and the value at 230 ° C. of the crystal lattice plane corresponding to 2θ = 7.4 ° ± 0.3 ° calculated from the X-ray diffraction pattern (according to the following specific formula) ) Is 3.0% or less, The diketopyrrolopyrrole pigment fine particles according to any one of the above (1) to (7).
The rate of change between the value at 80 ° C. and the value at 230 ° C. =
{(Planar spacing at 230 ° C.) / (Planar spacing at 80 ° C.) × 100} −100 (%) [specific formula]
(10) The diketopyrrolopyrrole pigment fine particles according to any one of (1) to (9) above, wherein the standard deviation of the primary particle diameter is less than 7.0.
(11) The diketopyrrolopyrrole pigment fine particles according to any one of (1) to (10), wherein the coefficient of variation (CV value) of the primary particle diameter is less than 30.
(12) The diketopyrrolopyrrole pigment fine particles according to any one of (1) to (11) above, wherein the Fe content is 35 ppm or less.
(13) The diketopyrrolopyrrole pigment fine particles according to any one of (1) to (12) above, wherein the general formula (I) is represented by the following general formula (II).
[In the general formula (II), each R independently represents a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, —CF ₃ , or a saturated or unsaturated group that may have a substituent. Or an aryl group which may have a substituent. ]
(14) The diketopyrrolopyrrole pigment fine particles according to the above (13), which are represented by the following formula (III), wherein R is bromine.
(15) The crystallite size in the plane direction corresponding to the maximum peak in the X-ray diffraction pattern among 140 planes (± 1 ± 1 ± 1) of the crystal lattice planes calculated by the X-ray diffraction pattern is 140 mm. Diketopyrrolopyrrole pigment fine particles containing a compound represented by the formula (III):
(16) A pigment dispersion containing at least an organic pigment and an organic solvent, wherein the organic pigment is the diketopyrrolopyrrole pigment fine particles according to any one of (1) to (15) above. Characteristic pigment dispersion.
(17) A photosensitive coloring composition containing at least the pigment fine particles according to any one of (1) to (15).
(18) A color filter containing at least the photosensitive coloring composition according to (17).
(19) A color filter containing at least the pigment fine particles according to any one of (1) to (15).

According to the present invention, a photosensitive coloring composition using diketopyrrolopyrrole pigment fine particles having the characteristics of any one of (1) to (15) shown above, particularly a pigment dispersion containing these pigment fine particles. Since the color filter produced from the photosensitive coloring composition obtained by using it has high contrast, high coloring power, and excellent heat resistance, a photosensitive coloring composition and a color filter having very suitable performance are provided. It became possible to do.

(Pigment type)
The pigment fine particles according to the present invention are fine particles of a pigment containing a diketopyrrolopyrrole pigment compound represented by the following general formula (I).

[In the above general formula (I), X ₁ and X ₂ may each independently have a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, —CF ₃ , or a substituent. A saturated or unsaturated alkyl group or an aryl group which may have a substituent is shown. ]

As such a diketopyrrolopyrrole pigment compound, there are those obtained by various conventionally known production methods and various commercially available products.
For example, as a basic production method of a diketopyrrolopyrrole pigment compound, USP 4,415,685, USP 4,579,949, which discloses a succinate synthesis method using a nitrile compound as a starting material, and By selecting the type, number and position of the functional group of the starting material by the method described in these corresponding patents, selecting the type, number and position of X ₁ and X _{2 in} the above general formula (I) Can do.
Further, various improved methods, for example, JP-A-58-210084, JP-A-07-90189, JP-A-08-48908, WO2009 / 81930, pamphlet, EP14111092 B1, JP2012-2012. Examples thereof include those obtained by the method described in No. 211970.
A color index (C.I.) mounted C.I. I. Pigment red 254, C.I. I. Pigment red 255, C.I. I. Pigment red 264, C.I. I. Pigment orange 71, C.I. I. Pigment Orange 73 and the like, and various commercial products are also available.

Among these diketopyrrolopyrrole pigment compounds represented by the general formula (I), in particular, the diketopyrrolopyrrole pigment compound represented by the following general formula (II) having a substituent at the para position has a color tone. And is suitable for use as a red pigment.

[In the general formula (II), each R independently represents a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, —CF ₃ , or a saturated or unsaturated group that may have a substituent. Or an aryl group which may have a substituent. ]

Among them, C. wherein R is a chlorine atom. I. Pigment Red 254, or brominated diketopyrrolopyrrole (the following formula (III)), each of which is a bromine atom, has excellent light resistance, chemical resistance, high saturation, high brightness, and optical properties. Therefore, it is suitable for color filter applications and is particularly preferable.

C. I. Since Pigment Red 254 and brominated diketopyrrolopyrrole have different types of substituents, they have different spectral absorption hues. Brominated diketopyrrolopyrrole is C.I. I. Compared with Pigment Red 254, the spectral wavelength is shifted to the longer wavelength side, resulting in a more bluish red. These may be appropriately selected and used according to the target chromaticity.

In particular, brominated diketopyrrolopyrrole represented by the above formula (III) has a C.I. bond between molecules due to steric hindrance of the bromine atom. I. Since it is weak compared to CI Pigment Red 254, it can be easily formed into fine particles, and can have performances suitable for a color filter such as high contrast and high brightness. Therefore, it is more preferable for color filter applications.
Further, the present inventors have found that the highest contrast can be obtained when the crystallite size of the present invention and the ratio of crystallite sizes described below are calculated using brominated diketopyrrolopyrrole. .

The pigment fine particles according to the present invention may contain an organic pigment other than the diketopyrrolopyrrole pigment compound in addition to the diketopyrrolopyrrole pigment compound represented by the general formula (I). Thus, particle diameter control and chromaticity adjustment can also be performed by including other organic pigments. The organic pigment that can be used by mixing at this time is not particularly limited, for example, perylene pigment, perinone pigment, quinacridone pigment, quinacridone quinone pigment, anthraquinone pigment, anthanthrone pigment, benzimidazolone pigment, Disazo condensation pigment, disazo pigment, azo pigment, indanthrone pigment, phthalocyanine pigment, triarylcarbonium pigment, dioxazine pigment, aminoanthraquinone pigment, thioindigo pigment, isoindoline pigment, isoindolinone Pigments, pyranthrone pigments, isoviolanthrone pigments, or compositions and mixtures thereof. The organic pigment may be a crude pigment.

(Crystallite size)
1. First Embodiment of the Invention In the first embodiment of the present invention, the pigment fine particles according to the present invention comprise eight (± 1 ± 1 ± 1) of crystal lattice planes calculated from an X-ray diffraction pattern. The crystallite size in the plane (hereinafter referred to as “plane α”) direction corresponding to the maximum peak in the X-ray diffraction pattern in the plane is 140 mm or less, and 90% of the compound represented by the general formula (I) is 90%. It contains above.

The crystallite size in the plane α direction is 140 mm or less, preferably 130 mm or less, more preferably 120 mm or less, and most preferably 100 mm or less.
The content of the compound represented by the general formula (I) is preferably 90% or more and 95% or more, more preferably 97% or more, and most preferably 99% or more.

When the compound represented by the general formula (II) described above is contained as the pigment species, the plane α is the (1 1 1) plane shown in FIG. 5 and corresponds to 2θ = 24.5 ° ± 0.3 °. To do. Therefore, when the compound represented by the above general formula (II) is contained as a pigment species, the crystallite size of the crystal lattice plane corresponding to 2θ = 24.5 ° ± 0.3 ° is 140 mm or less. Is preferred.

2. Second Mode of the Invention In the second mode of the present invention, the fine pigment particles according to the present invention have a crystallite size in the plane α direction of 140 mm or less and are calculated by an X-ray diffraction pattern (15). -1) It contains a compound represented by the aforementioned general formula (I) having a crystallite size in the plane (hereinafter referred to as “plane β”) direction of 80 mm or less.

The crystallite size in the plane α direction is 140 mm or less, preferably 130 mm or less, more preferably 120 mm or less, and most preferably 100 mm or less. The crystallite size in the plane β direction is preferably 80 mm or less, more preferably 75 mm or less, and still more preferably 70 mm or less.
More preferably, the crystallite size in the plane α direction is 140 Å or less and the crystallite size in the plane β direction is 80 Å or less, more preferably the crystallite size in the plane α direction is 130 Å or less and the crystallite size in the plane β direction is 75 Å or less, Particularly preferably, the crystallite size in the plane α direction is 120 mm or less and the crystallite size in the plane β direction is 70 mm or less. Most preferably, the crystallite size in the plane α direction is 100 mm or less and the crystallite size in the plane β direction is 70 mm or less.

When the compound represented by the general formula (II) is contained as the pigment type, the surface α is the (1 1 1) surface as described above, and corresponds to 2θ = 24.5 ° ± 0.3 °. The plane β is the (1 5 −1) plane shown in FIG. 6 and corresponds to 2θ = 28.0 ° ± 0.3 °. Therefore, when the compound represented by the general formula (II) is contained as a pigment species, the crystallite size of the crystal lattice plane corresponding to 2θ = 24.5 ° ± 0.3 ° is 140 mm or less, and The crystallite size of the crystal lattice plane corresponding to 2θ = 28.0 ° ± 0.3 ° is preferably 80 mm or less.

3. Third aspect of the present invention In the third aspect of the present invention, the pigment fine particles according to the present invention have a crystallite size in the plane α direction of 2θ = of the crystal lattice plane calculated by the X-ray diffraction pattern. The ratio of crystallite size calculated by dividing by the crystallite size in the plane corresponding to the maximum peak at 3 to 10 ° (hereinafter referred to as “plane γ”) is 0.85 to 1.25, and An average primary particle diameter is 5-40 nm, It contains the compound shown by the general formula (I) mentioned above, It is characterized by the above-mentioned.

The ratio of the above crystallite sizes is preferably 0.85 to 1.25, more preferably 0.90 to 1.20, and most preferably 0.95 to 1.15.
The average primary particle size is preferably 5 to 40 nm, more preferably 10 to 30 nm, and most preferably 15 to 25 nm.
Further, it is preferable that the crystallite size ratio is 0.85 to 1.25 and the average primary particle diameter is 5 to 40 nm, and the crystallite size ratio is 0.90 to 1.20 and the average primary particle diameter is Those having a thickness of 10 to 30 nm are more preferable, and those having a crystallite size ratio of 0.95 to 1.15 and an average primary particle size of 15 to 25 nm are most preferable.

When the compound represented by the general formula (II) is contained as the pigment species, the plane α is the (1 1 1) plane as described above, and corresponds to 2θ = 24.5 ° ± 0.3 °. . The plane γ is the (0 2 0) plane shown in FIGS. 5 and 6 and corresponds to 2θ = 7.4 ° ± 0.3 °. Therefore, in this case, in the fine pigment particles according to the present invention, the crystallite size of the crystal lattice plane corresponding to 2θ = 24.5 ° ± 0.3 ° calculated by the X-ray diffraction pattern is calculated by the X-ray diffraction pattern. The ratio of the crystallite size calculated by dividing by the crystallite size of the crystal lattice plane corresponding to 2θ = 7.4 ° ± 0.3 ° is 0.85 to 1.25, and the average primary particle size Is preferably 5 to 40 nm.

In particular, the pigment type is C.I. I. In the case of Pigment Red 254, the crystallite size ratio is 0.85 to 1.25, more preferably 0.90 to 1.15, and still more preferably 0.95 to 1.10. The average primary particle size is preferably 5 to 40 nm, more preferably 10 to 30 nm, and most preferably 15 to 25 nm.
Further, the crystallite size ratio is preferably 0.85 to 1.25 and the average primary particle diameter is preferably 5 to 40 nm, the crystallite size ratio is 0.90 to 1.15 and the average primary particle diameter is 10 More preferably, the crystallite size ratio is 0.95 to 1.10, and the average primary particle size is most preferably 15 to 25 nm.

When the pigment type is brominated diketopyrrolopyrrole, the crystallite size ratio is preferably 0.85 to 1.25, more preferably 0.90 to 1.20, and 0.95 to 1.15. Is most preferred. The average primary particle size is preferably 5 to 40 nm, more preferably 10 to 30 nm, and most preferably 15 to 25 nm.
Further, the crystallite size ratio is preferably 0.85 to 1.25 and the average primary particle diameter is preferably 5 to 40 nm, the crystallite size ratio is 0.90 to 1.20 and the average primary particle diameter is 10 More preferably, the crystallite size ratio is 0.95 to 1.15, and the average primary particle size is most preferably 15 to 25 nm.

In Table 1, (0 2 0) plane, (1 1 1) plane, (1 5 -1) plane, Bragg angle (2θ) and three lattice planes of the compound represented by the general formula (II) The relationship is shown.

4). Fourth aspect of the present invention In the fourth aspect of the present invention, the fine pigment particles according to the present invention have a crystallite size in the plane α direction of 140 mm or less and a compound represented by the above-mentioned formula (III) ( Brominated diketopyrrolopyrrole).

The preferred crystallite size in the plane α direction and the preferred crystallite size in the plane β direction, the ratio of the preferred crystallite size, and the primary particle diameter are the same as in the second and third embodiments of the present invention.
The content of the compound represented by the preferred formula (III) is the same as the content of the compound represented by the general formula (I) in the first embodiment of the present invention.

3. 3. Effect of crystallite size and its ratio on performance 3-1 Crystallite size Generally, light is easily scattered at the interface (crystal grain boundary) between crystallites constituting a primary particle, and the crystal grain boundary is light. It is known to become a main factor of scattering. Therefore, to improve the optical characteristics of the pigment fine particles, it is conceivable to reduce the area of the crystal grain boundary in the fine particle and reduce the influence of the crystal grain boundary. For this reason, attempts to reduce crystal grain boundaries have been made in various fields. In order to reduce the area of the crystal grain boundary, it is better that the crystallite size is large. However, the inventors have unexpectedly found that the pigment fine particles according to the present invention having a smaller crystallite size as described above have excellent optical properties. The mechanism that exhibits excellent optical properties due to the crystallite size of the pigment fine particles according to the present invention is not completely clear, but is presumed as follows.

When the crystallite size is small, the number of interfaces (crystal grain boundaries) between crystallites constituting the primary particles increases, but the area of each crystal grain boundary decreases. In general, it is considered that light scattering tends to occur when the area of the crystal grain boundary is large. On the other hand, in the present invention, the crystallite size is controlled to be small, so that the area of the crystal grain boundary is reduced, light scattering is reduced, and the contrast and brightness of the obtained color filter are improved. Is done. Here, the small crystallite size means that the crystallite size in the plane α direction is 140 mm or less, and the crystallite size in the plane β direction is 80 mm or less.

Further, as shown in FIG. 7, since the primary particles of the pigment are composed of crystallites, the primary particles can also be reduced by reducing the crystallite size. It can be considered that the transmittance of the color filter is high, the light scattering is kept low, and the contrast and brightness are improved by the small primary particles. Here, that the primary particles of the pigment are small means that the average primary particle diameter is 40 nm or less.

Further, in the case of an anisotropic crystal such as the diketopyrrolopyrrole pigment compound represented by the general formula (I), birefringence due to the crystal itself, not the grain boundary, cannot be completely prevented.
In particular, in the case of a diketopyrrolopyrrole pigment compound having a substituent at the para position (the above general formula (II)), the space group is P21 / n and the substituent is at the meta position, taking a herringbone pattern structure. Compared with Tert-butyl-diketopyrrolopyrrole having a brick structure of a pseudo brick wall and a space group of P1 (with bar (-) on P1), the symmetry is low and the anisotropy is high. Therefore, by setting the crystallite size of the plane α to 140 mm or less and the crystallite size of the plane β to 80 mm or less, the isotropic property is further improved as described later, and excellent optical characteristics are obtained. Can be obtained. As shown in the following formula 1, a bar (-) is attached on P1.

Furthermore, since the pigment fine particles according to the present invention have small primary particles, it is possible to suppress problems such as the generation of foreign matters due to coarse primary particles.

On the other hand, when the crystallite size is large, the primary particles are necessarily large. As the crystallite size increases, the primary particles also increase, which may hinder the improvement of the contrast and brightness of the color filter.

When the crystallite size exceeds the upper limit of the range of the present invention, for example, the crystallite size in the plane α direction exceeds 140 mm, and the crystallite size in the plane β direction exceeds 80 mm, the contrast and luminance of the color filter to be obtained Is not enough. In addition, foreign matter is likely to be generated due to coarse particles.
The lower limit of the crystallite size is not particularly limited, but if it is too small, the primary particles become smaller than necessary, and the specific surface area of the primary particles increases. As the specific surface area of the primary particles increases, the surface energy of the particles increases, making it difficult to disperse the pigment fine particles in the dispersion medium. Specifically, pigment fine particles are aggregated during dispersion, or the viscosity of a pigment dispersion in which pigment fine particles are dispersed in a dispersion medium is high, and there is a high possibility of causing thickening or gelation due to changes over time. If the pigment dispersion contains a large amount of dispersant to stabilize the dispersion, the color components contained in the resulting color filter will decrease, and there will be more dispersant components that are not necessary for the color filter characteristics. There is a high possibility that deterioration of characteristics and defects in processability in producing color filters will occur. In addition, it has been found by the present inventors that it is technically difficult to make the crystallite size too small, and on the other hand, sufficient performance improvement can be obtained without making it too small. For this reason, it is sufficient to reduce the crystallite size to the upper limit value or less.

3-2 The ratio of the crystallite size and the ratio of the average primary particle diameter α and the crystallite size of the plane γ are within the range of the present invention, for example, within the range of 0.85 to 1.25. A luminance color filter can be obtained. The mechanism of the crystallite size ratio on the optical characteristics of the color filter is not completely clear, but is estimated as follows.

A small crystallite size ratio, that is, an aspect ratio (hereinafter also referred to as “crystallite size aspect ratio”) means that the crystallite is nearly spherical. If the shape is close to a sphere, the crystallites are densely packed when forming the primary particles, and the crystallites are easily arranged in the primary particles with little anisotropy. By reducing the anisotropy in the primary particles, the primary particles are considered to be optically uniform, leading to an improvement in contrast and brightness. In addition, since the crystallites are nearly spherical, it is considered that the primary particles formed by the aggregation of crystallites are also primary particles having a spherical shape and a small aspect ratio. When the primary particles are nearly spherical, the pigment fine particles are less likely to be oriented in the cured film containing pigment fine particles that are aggregates of the primary particles, and the anisotropy of the cured film is reduced, leading to an improvement in contrast and brightness. it is conceivable that.

Further, by making the above-mentioned crystallite size ratio within the range of the present invention, a pigment dispersion in which pigment fine particles are dispersed in a dispersion medium can also reduce the addition amount of the dispersant and have a low viscosity. Dispersibility can be improved. Probably because the aspect ratio of the primary particles is small, the specific surface area of the pigment fine particles formed from the primary particles is small, pigment fine particles having a small particle surface energy are obtained, and aggregation of particles is suppressed. The

When the aspect ratio of the above crystallite size exceeds the range of the present invention, the contrast and brightness of the obtained color filter are not sufficient.
In particular, each crystal lattice plane in which the ratio of crystallite size to crystallite size is specified in the present invention is a (± 1 ± 1 ± 1) plane (plane α) and 2θ = 3 to 10 calculated from an X-ray diffraction pattern It is the plane corresponding to the maximum peak at ° (plane γ), but these planes were found to be useful as an index of isotropicity by the present inventors, and were groundbreaking. It can be said that it is a thing.

However, even if the aspect ratio of the crystallite is small, when the average primary particle size is large, the contrast and brightness of the obtained color filter are low. In addition, when the average primary particle diameter is 5 nm or less, even if the ratio of crystallite sizes is within the above range, the specific surface area of the primary particles is increased and the particles tend to aggregate, so that a good dispersion can be obtained. It becomes difficult. Accordingly, only when pigment fine particles having a crystallite size ratio within the above range and a primary particle size within the above range, for example, an average primary particle size in the range of 5 to 40 nm, are used with high contrast. A high brightness color filter can be obtained.

(Measurement of crystallite size)
As described above, the crystallite size can be measured by making the Bragg angle (2θ) of the X-ray diffraction spectrum correspond to the lattice plane of the crystal structure.
In the diketopyrrolopyrrole pigment, C.I. I. The crystal structure of Pigment Red 254 has been analyzed by X-ray crystal structure analysis in the literature (Acta. Cryst. B49, 1056 (1993)). I. In the case of pigment red 254, the crystallite size can be measured using this. In addition, the X-ray diffraction pattern of brominated diketopyrrolopyrrole is shown in FIG. I. Although the X-ray diffraction intensity is different from that of Pigment Red 254, the peak position appears in the same place, so that brominated diketopyrrolopyrrole is C.I. I. Analysis can be performed on the assumption that the crystal structure similar to that of Pigment Red 254 and the lattice plane of the crystal structure are taken.
Similarly, in the case of other diketopyrrolopyrrole pigments, the crystal structure is analyzed by the X-ray diffraction pattern, and the Bragg angle (2θ) of the X-ray diffraction spectrum is made to correspond to the lattice plane of the crystal structure.

In the present invention, the measurement of the crystallite size of each crystal lattice plane described above is performed under the following conditions and procedures.
(1) Powder X-ray diffraction measurement using CuKα rays of the sample is performed in a Bragg angle (2θ) range of 5.3 ° to 60 °.
(2) From the X-ray diffraction pattern obtained in (1), a diffraction pattern with the background removed is obtained. The background is removed by connecting the bottoms of the measurement pattern with Bragg angles (2θ) = about 5.3 °, about 6.5 °, about 10 °, and about 60 ° with straight lines. The operation is to obtain a pattern obtained by removing the X-ray diffraction intensity value represented by the ground from the X-ray diffraction intensity value obtained in (1).
(3) From the X-ray diffraction pattern obtained by removing the background obtained in (2), in the compound represented by the general formula (II), the Bragg angle which is a characteristic diffraction peak of the (0 20) plane Diffraction peak near (2θ) = 7.4 ° ± 0.3 ° and diffraction near Bragg angle (2θ) = 24.5 ° ± 0.3 ° which is a characteristic diffraction peak of (1 1 1) plane The Bragg angle (2θ), which is a characteristic diffraction peak of the peak (1 5 −1) plane, is 28.0 ° ± 0.3 °. ) The half width can be calculated by performing peak separation on each of the three diffraction peaks existing in the measurement range using commercially available data analysis software. For example, in the examples described later, data analysis software HighScorePlus Ver. 3.0e (3.0.5) was used, and the half width value calculated by fitting the peak shape as the Pseudo Voice function was used.
(4) The crystallite size is calculated from the half-width of the diffraction peak calculated in (3) and the Scherrer equation below.
D = Kλ / (B × cosA)
B = Bobs-b
here,
D: Crystallite size (Å)
Bobs: full width at half maximum (rad) calculated in (3)
b: X-ray diffractometer angular resolution correction coefficient, half-value width (rad) when measuring standard silicon crystal. A standard silicon crystal is measured under the following apparatus configuration and measurement conditions, and b = 0.087.
A: Diffraction peak Bragg angle 2θ (rad)
K: Scherrer constant (defined as K = 0.90)
λ: X-ray wavelength (Å) (Because it is CuKα ray, λ = 1.54)

Details of the measurement conditions were as follows.
X-ray diffractometer: Multipurpose X-ray diffractometer X'Pert Powder manufactured by Panalical
Goniometer: Panalical's high precision sample horizontal goniometer Sampling width: 0.0131 °
Step time: 0.335 seconds Divergence slit: Programmed divergence slit Incident side scattering slit: None Incident side solar slit: 0.04 °
Incident side mask: 10 mm
Light receiving side scattering slit: 8 mm
Receiving side solar slit: 0.04 °
Tube: Cu
Tube voltage: 45kV
Tube current: 40 mA

It should be noted that other methods may be adopted as long as the same results as those described above can be obtained.

[Calculation of crystallite size ratio]
By dividing the crystallite size of the (1 1 1) plane by the crystallite size of the (0 2 0) plane from the crystallite size of each plane determined by the above-described method, the (1 1 1) plane and the (0 2 0) The ratio of the crystallite size to the plane is calculated.

[Change rate of crystal lattice plane spacing]
The diketopyrrolopyrrole pigment fine particles according to the present invention have an interplanar spacing of the crystal lattice plane corresponding to the maximum peak at 2θ = 3 to 10 ° calculated by the X-ray diffraction pattern before and after heating, and a value at 230 ° C. It is preferable that the rate of change of the value at ° C. (according to the following specific formula) is 3.0% or less. It is more preferably 2.0% or less, and particularly preferably 1.5% or less.
The rate of change between the value at 80 ° C. and the value at 230 ° C. =
{(Planar spacing at 230 ° C.) / (Planar spacing at 80 ° C.) × 100} −100 (%) [specific formula]

Here, C.I. I. In Pigment Red 254 and brominated diketopyrrolopyrrole, 2θ = 7.4 ° ± 0.3 ° is the maximum peak at 2θ = 3 to 10 °, and corresponds to the (0 20) plane. The (0 2 0) plane is a plane substantially perpendicular to the major axis of the crystal lattice, and the rate of change of the interplanar spacing due to heating is the largest compared to other crystal lattice planes. It becomes an index of how.

In other diketopyrrolopyrrole pigments, C.I. I. Similar to Pigment Red 254 and brominated diketopyrrolopyrrole, the plane corresponding to the maximum peak at 2θ = 3 to 10 ° is a plane substantially perpendicular to the major axis of the crystal lattice, and is heated by heating compared to other crystal lattice planes. Since the rate of change of the interplanar spacing is the largest, it is an indicator of whether the crystal structure is stable.

The manufacture of the color filter includes a process in which the pigment is heated, and color characteristics are deteriorated more or less by heating. Specifically, hue shift, contrast, and luminance reduction due to heating are problematic.
On the other hand, the fine pigment particles according to the present invention can suppress deterioration of color characteristics due to heating by setting the rate of change of the interplanar spacing to 3.0% or less, and can obtain a color filter with higher quality. .

In the present invention, a mechanism capable of obtaining a color filter having excellent optical characteristics by using pigment fine particles having a small change rate of the spacing between crystal lattice planes, and a small particle size of crystallites and an aspect ratio of crystallite size are small. The mechanism by which the rate of change in the spacing between the crystal lattice planes can be reduced by the pigment fine particles is not completely clear, but is estimated as follows.

In most cases, the change in crystal lattice spacing due to heating changes in the direction in which the spacing increases. If the interplanar spacing increases, the area of the crystal grain boundary between crystallites increases, and as described above, it becomes primary particles that easily scatter light, and it is presumed that contrast and brightness are likely to decrease in pigment fine particles. .
In addition, the fact that the rate of change of the interplanar spacing due to heating is large means that the crystal structure is not stable, the crystal structure changes due to heating, and the hue shift is caused by the interaction of the electron orbitals of adjacent molecules. It is speculated that it will occur.

In general, the reason why the rate of change in the interplanar spacing due to heating increases is considered to be because many unstable elements are included in the crystal structure. Examples of unstable elements of the crystal structure include impurities, amorphous components, and crystal structure distortion.
If the crystallite size is mixed or the crystallite aspect ratio is large, the crystal structure may be distorted, or it may contain a lot of unstable amorphous structures in the adjacent part of the crystallite. It is presumed that the structure changes, leading to a hue shift due to the interaction of the electron orbitals of neighboring molecules. It is also conceivable that an unstable amorphous structure is crystallized by heating to generate foreign matter. On the other hand, since the fine pigment particles of the present invention have small crystallites and are nearly spherical, the crystal structure distortion is small and precise and stable, the change in crystal structure due to heating is suppressed, and the rate of change in interplanar spacing is small. Guessed.

In the case of the pigment fine particles according to the present invention having a specific crystallite size or a specific crystallite size ratio, the crystal grain boundaries that cause unstable elements of the crystal structure are suppressed to be small, and the crystallites are densely assembled. It is thought that it has a stable crystal structure. For this reason, the rate of change in surface spacing due to heating can be kept within the above range, for example, 3.0%. In other words, it can be said that the rate of change in interplanar spacing due to heating is small and the pigment has a stable crystal structure.

The method for measuring the rate of change in the spacing between crystal lattice planes by heating is performed as follows.
(1) As in the above-mentioned [Measurement of crystallite size], powder X-ray diffraction measurement by heating using CuKα rays is performed with a Bragg angle (2θ) in the range of 5.3 ° to 50 °.
Specifically, first, an X-ray diffraction pattern is measured at 25 ° C., and then the temperature is raised to 80 ° C. and held for 10 minutes, and then the X-ray diffraction pattern at 80 ° C. is measured. Further, the temperature is raised to 230 ° C. and the temperature is maintained for 10 minutes, and then an X-ray diffraction pattern at 230 ° C. is measured.
(2) From the X-ray diffraction pattern obtained in (1), a diffraction pattern with the background removed is obtained. The background removal method is as follows: Bragg angle (2θ) = 5.3 ° and 6.5 °, 10 °, 37.5 ° near the bottom of the measurement pattern, respectively. This is an operation for obtaining a pattern obtained by removing the X-ray diffraction intensity value represented by the background from the X-ray diffraction intensity value obtained in (1).
(3) From the X-ray diffraction pattern obtained by removing the background obtained in (2), data analysis software HighScorePlus Ver. 3.0e (3.0.5) was used, and the peak shape was fitted as a Pseudo Voigt function, and the Bragg angle (2θ) = 7, which is a characteristic diffraction peak of the (0 20) plane, according to the following Bragg equation: Calculate the plane spacing of the diffraction peak around 4 ° ± 0.3 °.
2 dsin A = nλ
here,
d: Surface spacing (Å)
A: Diffraction peak Bragg angle 2θ (rad)
λ: X-ray wavelength (Å) (Because it is CuKα ray, λ = 1.54)
n: Integer (4) From the results of the face spacing of the (0 2 0) face at 80 ° C. and 230 ° C. obtained in (3), the rate of change of the face spacing due to these temperature changes is calculated from the following specific formula. .
Value at 80 ° C. and rate of change between values at 230 ° C. = {(Plane spacing at 230 ° C.) / (Plane spacing at 80 ° C.) × 100} −100 (%) [specific formula]
The details of the measurement conditions are the same as the above-mentioned [Measurement of crystallite size].
It should be noted that other methods may be adopted as long as the same results as those described above can be obtained.

[Primary particle size]
The diketopyrrolopyrrole pigment fine particles in the third embodiment of the present invention have a primary particle size of 5 to 40 nm. In the diketopyrrolopyrrole pigment fine particles according to the first, second, and fourth aspects of the present invention, the primary particle diameter is preferably 5 to 40 nm. In any case, the primary particle diameter is more preferably 10 to 30 nm, and particularly preferably 15 to 25 nm.
The standard deviation of the primary particle diameter is preferably less than 7.0, more preferably less than 6.0, and particularly preferably less than 4.0.
Further, the coefficient of variation of the primary particle diameter (CV value: hereinafter referred to as “CV value”) is preferably less than 30, more preferably less than 28, and particularly preferably less than 25.

A high-contrast pigment dispersion can be obtained by setting the primary particle size of the diketopyrrolopyrrole pigment fine particles to the upper limit or less. On the other hand, by setting the primary particle diameter of the diketopyrrolopyrrole pigment fine particles to be equal to or larger than the lower limit, the viscosity when the dispersion is adjusted can be kept low, and the change in viscosity with time can also be suppressed.
In the case of diketopyrrolopyrrole pigment fine particles having a primary particle diameter exceeding the upper limit, the contrast may be lowered, and the performance required for color filter use may not be satisfied. In the case of diketopyrrolopyrrole pigment fine particles having a primary particle size less than the above lower limit, it becomes difficult to disperse the pigment fine particles in the dispersion medium, and the dispersant, binder resin, pigment derivative, etc. to the pigment dispersion during the dispersion treatment Since the amount of the compound added becomes very large, application of the pigment dispersion to a color filter tends to be difficult.

By setting the standard deviation of the primary particle diameter of the diketopyrrolopyrrole pigment fine particles to be equal to or less than the above upper limit, a pigment dispersion having particularly high contrast and low viscosity and small change in viscosity with time can be obtained.
When the standard deviation of the primary particle diameter exceeds the upper limit, a large number of primary particles having irregular sizes and shapes are likely to cause a decrease in contrast of the pigment dispersion.

By setting the CV value of the primary particle size of the diketopyrrolopyrrole pigment fine particles to be not more than the above upper limit, a pigment dispersion having particularly high contrast and low viscosity and small change in viscosity with time can be obtained.
When the CV value of the primary particle diameter exceeds the upper limit, a large number of primary particles having irregular sizes and shapes are likely to cause a decrease in contrast of the pigment dispersion.

Here, the primary particle diameter is a particle diameter calculated from an image obtained by observation with an electron microscope. The measurement method of the primary particle size, its standard deviation, and the CV value is as follows.
10 parts by weight of pigment fine particles according to the present invention, 5 parts by weight of “BYKLPN6919” (manufactured by Big Chemie) as a dispersant, and C.I. I. 1 part by weight of a sulfonated derivative of Pigment Red 254 and 70 parts by weight of propylene glycol monomethyl ether acetate as an organic solvent serving as a dispersion medium are stirred and mixed with a paint shaker (manufactured by Asada Tekko Co., Ltd.) for 6 hours to obtain a pigment dispersion. Got. The pigment dispersion was diluted 50 to 200 times with propylene glycol monomethyl ether acetate, and the diluted solution was treated with an ultrasonic homogenizer (manufactured by SND Co., Ltd., ultrasonic cleaner US-105) for 5 minutes. The image was observed. For this observation, an S-5200 field emission scanning electron microscope (manufactured by Hitachi High-Technologies Corporation) was used at an observation magnification of 1 million with an acceleration voltage of 20 kV, and 100 particles that could be clearly identified from the observed image. The major axis was measured using image analysis software for SEM (Scandium manufactured by OLYMPUS), and the primary particle size, its standard deviation, and the CV value were calculated.

[Content of diketopyrrolopyrrole compound]
The pigment fine particles according to the first embodiment of the present invention contain 90% or more of the compound represented by the general formula (I). Thus, coloring power and brightness | luminance can be kept high by containing the compound shown by general formula (I) by high concentration.
In order to reduce the crystal size of the pigment fine particles, it is conceivable to add, for example, a component that suppresses particle growth (for example, a pigment derivative as described in Patent Document 5). Then, it becomes difficult to keep coloring power and luminance high. On the other hand, the pigment fine particles according to the first embodiment of the present invention have a coloring power by keeping the content of the compound itself represented by the general formula (I) other than components such as pigment derivatives as high as 90% or more. And the brightness can be kept high.
Further, in the pigment fine particles according to the second and third embodiments of the present invention, the content of the compound represented by the general formula (I) is 90% or more in order to keep the coloring power and luminance high. It is possible and desirable to do so.
Also in the pigment fine particles according to the fourth aspect of the present invention, the content of brominated diketopyrrolopyrrole represented by the formula (III) can be 90% or more, and it is desirable to do so.

The content of the diketopyrrolopyrrole pigment compound represented by general formula (I), general formula (II), or formula (III) can be specified as follows.
The solvent extract of pigment fine particles according to the present invention is subjected to LC-MS analysis and NMR analysis to identify contained components and further quantitatively analyzed.
More specifically, the pigment fine particles are dissolved in an organic solvent such as tetrahydrofuran (hereinafter referred to as “THF”), followed by liquid chromatography separation using LC-MS and molecular weight analysis. Insoluble matter is analyzed for molecular weight by a solid direct introduction probe. These are techniques for identifying each component based on molecular weight information of the whole and part of the molecule. Furthermore, it is possible to perform quantitative analysis in comparison with the diketopyrrolopyrrole pigment compound represented by the general formula (I), the general formula (II), and the formula (III), which are components of the pigment fine particles, and the preparation of the identification component. it can.
Further, the pigment fine particles can be dissolved in deuterated dimethyl sulfoxide or bisulfuric acid, each component can be identified by NMR measurement, and quantified from the area ratio of the NMR spectrum.

[Performance of fine pigment particles according to the present invention]
The fine pigment particles according to the present invention described above have excellent optical properties. Specifically, the contrast when a cured film having chromaticity x = 0.6500 is 7,000 or more, more preferably 8,000 or more, and even 10,000 or more. Further, the film thickness for setting the chromaticity x = 0.6500 may be 2.80 μm or less, particularly 2.70 μm or less, and further 2.60 μm or less. Furthermore, when the chromaticity x = 0.6500 and y = 0.3230, the luminance is 18.00 or more, and further 19.00 or more, and a color filter having extremely excellent optical characteristics can be obtained. The production of the cured film will be described later.

Here, the contrast is one of the indicators of the color characteristics of the pigment, and a higher contrast is preferred because the color development becomes fine when used in an optical material such as a display. The contrast is measured by irradiating a cured film sandwiched between two polarizing plates and transmitting light when the polarization planes of the front-side polarizing plate and the rear-side polarizing plate are parallel and at right angles. The amount of light is measured using a contrast measuring device (CT-1 manufactured by Aisaka Electric Co., Ltd.), the transmitted light is the luminance on the polarizing plate, and the luminance when the polarizing plane of the polarizing plate is perpendicular to the luminance. Is calculated as contrast {(contrast) = (luminance when the polarization plane of the polarizing plate is parallel) / (luminance when the polarization plane of the polarizing plate is perpendicular)}.

In addition, if the thickness of the cured film can be reduced with the same chromaticity, the photosensitive coloring composition can be saved, and when adjusted to the same film thickness, a cured film with high coloring power can be obtained. Therefore, it is preferable. The film thickness is measured using a non-contact surface / layer cross-sectional shape measurement system (Ryuka System R5300G-Lite).

The heat resistance is indicated by the contrast change rate {(contrast before post-baking process−contrast after post-baking process) / contrast after post-baking process × 100 (%)}.

In addition, the number of coarse particles that can be confirmed when the cured film is observed with an optical microscope at 500 times can be suppressed to 50 or less, and further to 20 or less.

In addition, brightness is one of the indicators of pigment color characteristics as well as contrast, and the higher the contrast and brightness values, the better the coloring when used in optical materials such as displays, and the reduction in the amount of light from the backlight. It is preferable because it is possible. The measurement of luminance is obtained by measuring the cured film using a spectrophotometer (LCF-1100 manufactured by Otsuka Electronics Co., Ltd.).

Although the mechanism that can provide a color filter having extremely excellent optical properties by the pigment fine particles according to the present invention having a specific crystallite size or a specific crystallite size ratio is not completely clear, As described above, the crystallite size is controlled to be, for example, 140 Å or less for the crystallite size in the plane α direction and 80 Å or less for the crystallite size in the plane β direction. By controlling in the range of 0.85 to 1.25, the occurrence of crystal distortion and the like is suppressed, the structure is stable, and it is speculated that this contributes to little change when heated (heating) Improved performance by reducing changes due to
In addition, it is presumed that the effect of light scattering and the like exerted by the crystal interface is suppressed (optical effect of crystal grain boundaries).
Furthermore, the ratio of the crystallite size and the crystallite size contributes to the primary particles existing in a good state in the cured film by making the size and shape of the primary particles small and isotropic. (Effect of the state of primary particles in the cured film).
It is speculated that these plural elements achieve the excellent effect of the present invention by a synergistic effect, which is difficult to achieve from the prior art.

In addition, in the cured film such as a color filter or in the photosensitive coloring composition, the content of the diketopyrrolopyrrole pigment compound represented by the general formula (I), the general formula (II), or the formula (III) is specified. This can be done as follows.
About the solvent extract of a cured film or a photosensitive coloring composition, LC-MS analysis and NMR analysis are performed, a contained component is identified, and also quantitative analysis is carried out.
More specifically, a cured film or a photosensitive coloring composition is dissolved in an organic solvent such as THF, and liquid chromatography separation is performed by LC-MS to perform molecular weight analysis. Insoluble matter is analyzed for molecular weight by a solid direct introduction probe. Furthermore, compared with the diketopyrrolopyrrole pigment compound represented by the general formula (I), the general formula (II), and the formula (III), which are components of the cured film and the photosensitive coloring composition, and the preparation of the identification component. Can be quantitatively analyzed.
Moreover, a cured film and a photosensitive coloring composition can be dissolved in deuterated dimethyl sulfoxide or bisulfuric acid, each component can be identified by NMR measurement, and quantified from the area ratio of the NMR spectrum.

〔Production method〕
The production method of the diketopyrrolopyrrole pigment fine particles according to the present invention is not particularly limited. It can be manufactured using the various conventional techniques described above.

Above all, it is relatively easy to control the crystallite size and primary particle size, and manufacturing is performed using a reprecipitation method that has a low risk of causing distortion of pigment crystals due to excessive energy drop such as the salt milling method. Preferably it is done.
Among the reprecipitation methods, a solution in which an organic pigment is dissolved in a good solvent (hereinafter also referred to as “pigment solution”) and a poor solvent for the organic pigment that is compatible with the good solvent (hereinafter also referred to as “poor solvent”) It is desirable to carry out the production using a continuous reaction apparatus in which the pigment fine particles are continuously fed to the reaction field and the pigment fine particles deposited by mixing them are taken out from the liquid.
In particular, a reaction apparatus (hereinafter also referred to as a “fluid processing apparatus”) in which the pigment solution and the poor solvent are continuously mixed between relatively rotating processing surfaces that can approach and separate from each other is used. Most preferably, the mixing is performed. The reactor is formed between processing surfaces that rotate relative to each other in a state where they can approach and leave, and in a special environment of a thin film fluid forced by the processing surface, the pigment solution and the poor solvent are mixed. It mixes and precipitates pigment fine particles, and is different from conventional microreactors and other mixing and stirring devices. In addition, the pigment solution and poor solvent are mixed at a very small distance between the processing surfaces that rotate relatively in a state where they can be approached and separated, and the effect of gravity can be substantially eliminated. Furthermore, it is preferable that the pigment fine particles be deposited using the reaction apparatus not under turbulent flow conditions but under laminar flow conditions.

The reason why such a method is suitable is considered as follows.
First, in the case of a method of mechanically pulverizing a pigment such as the salt milling method, the crystallite size is, for example, 140 mm or less for the crystallite size in the plane α direction, and 80 mm for the crystallite size in the plane β direction. It is necessary to apply a very large force to reduce the following range. In addition, since crystal growth occurs simultaneously with pulverization, it is necessary to create a state in which the reaction is in equilibrium, which is difficult to control and poor in productivity. In the case of the reprecipitation method, since the pigment is once dissolved, the control of the particle size is easier. However, even in the case of the reprecipitation method, it is not easy to control the crystallite size. As the reaction continues, the crystallites grow gradually, which must be prevented. Therefore, it is considered important to rapidly contact the pigment solution and the poor solvent in the reaction field to produce a large amount of small crystallite size particles. For this reason, the diffusion coefficient in the reaction field is important. Therefore, it is considered desirable to use a continuous reaction apparatus that continuously collects pigment fine particles generated by continuously supplying a pigment solution and a poor solvent to a reaction field. In particular, the diffusion coefficient in the reaction field increases if a reaction apparatus is used in which the pigment solution and the poor solvent are continuously mixed between relatively rotating processing surfaces that can approach and leave. Thus, it is considered that a large number of crystal nuclei are generated, and fine crystallite pigment fine particles can be obtained efficiently.

In the reprecipitation method, particularly the method in which the pigment fine particles are continuously deposited between the relatively rotating processing surfaces that can approach and leave, the obtained pigment fine particles are very fine, It was found that particles can be produced uniformly, and crystallite size and distribution thereof can be small. That is, the obtained pigment fine particles are very fine pigment fine particles with few coarse particles and a uniform particle diameter, and the occurrence of crystal distortion and the like is suppressed. This is because, as described above, the contact between the pigment solution and the poor solvent occurs at a very high speed, so the diffusion coefficient of the reaction field increases, and a large amount of fine crystallite nuclei are refined to collect fine crystallites. It is presumed that this is because the fine pigment particles can be obtained and the excessive energy given by the grinding treatment such as the salt milling treatment is not dropped and the generation of distortion can be suppressed.

The pigment fine particles obtained by the above-described method are in a good state such as crystals, and since there are few coarse particles that impair the colorability, a pigment fine particle dispersion excellent in heat resistance and colorability can be obtained. In other words, by controlling not only the primary particle size of pigment fine particles but also the size and distribution of crystallites, it is possible to obtain a color filter that maintains excellent performance with improved characteristics such as color characteristics and heat resistance. became.

Specifically, the production of the pigment fine particles according to the present invention by the reprecipitation method can be performed as follows.
First, a diketopyrrolopyrrole pigment base (hereinafter also referred to as “pigment base”) is dissolved in a good solvent. The pigment base material refers to a pigment before the refining treatment described below. The diketopyrrolopyrrole pigment base material is not particularly limited, but it is also possible to use known commercially available pigments, which are disclosed in various conventional techniques for the production method of the diketopyrrolopyrrole pigment described above. It is also possible to use pigments made by the methods described above.

Examples of the good solvent for dissolving the diketopyrrolopyrrole pigment base material include water, an organic solvent, and a mixed solvent composed of a plurality of them. Examples of the water include tap water, ion-exchanged water, pure water, ultrapure water, and RO water, and organic solvents include alcohol solvents, amide solvents, ketone solvents, ether solvents, aromatic solvents. Examples include solvents, carbon disulfide, aliphatic solvents, nitrile solvents, sulfoxide solvents, halogen solvents, ester solvents, ionic liquids, carboxylic acid compounds, and sulfonic acid compounds. Each of the above solvents may be used alone or in combination of two or more.

Here, a compound such as an inorganic hydroxide such as sodium hydroxide or potassium hydroxide, a metal alkoxide such as sodium methoxide or potassium tert-butoxide, or a quaternary ammonium compound should be present in the good solvent. It has been known. In the present invention, it is particularly preferable to add a quaternary ammonium compound to the good solvent. By adding the quaternary ammonium compound to the good solvent, it becomes particularly easy to control the crystallite size and the primary particle diameter, which are the characteristics of the present invention. Although the mechanism is not clear, the presence of a quaternary ammonium compound in the solvent gives good results for the dissolution and subsequent precipitation of the diketopyrrolopyrrole pigment base, and in turn improves the color characteristics. It is considered a thing.

As quaternary ammonium compounds that can be added, hydroxides such as benzyltrimethylammonium, tetramethylammonium, tetraethylammonium, tetrapropylammonium, tetrabutylammonium, tetrahexylammonium, chloride, bromide can be used. Among them, it is preferable to use a hydroxide from the viewpoint of improving solubility, and it is particularly preferable to use benzyltrimethylammonium hydroxide or tetramethylammonium hydroxide. These can be used alone or in admixture of two or more.
Besides these, tetradecyldimethylbenzylammonium chloride, tetra-N-butylammonium tribromide, tetrabutylammonium hexafluorophosphate, tetrabutylammonium perchlorate and the like can also be used.

The addition amount of the quaternary ammonium compound is preferably 0.1 to 10 molar equivalents relative to the pigment base, and more preferably 0.3 to 6 molar equivalents relative to the pigment base. It is particularly preferable to add 0.5 to 4 molar equivalents. Addition of 0.1 molar equivalent or more with respect to the pigment base material is advantageous in that the pigment base material can be sufficiently dissolved and generation of coarse particles can be suppressed in precipitation of pigment fine particles. . In addition, the amount of the pigment base relative to the solvent can be optimized by suppressing it to 10 molar equivalents or less with respect to the pigment base, which is preferable in terms of obtaining good productivity. This is advantageous in that acceleration can be suppressed and heat resistance and color characteristics can be positively affected.

The method for preparing the pigment solution is not particularly limited, but it is preferable to use a stirrer having a rotating stirring blade. Naturally, it is possible to suppress the generation of coarse particles caused by undissolved substances in the pigment solution, and naturally, even when two or more types of molecules and elements are dissolved, the pigment dissolution is more uniform. The liquid can be prepared quickly.

By preparing a pigment solution using a stirrer having a rotating stirring blade, a pigment solution having a uniform dissolved state or molecular dispersed state at a molecular level can be obtained. It is presumed that the cluster formation state is improved.

The stirrer used for the preparation of the pigment solution is not particularly limited as long as it is a stirrer having a rotating stirring blade, but in a general stirrer having a rotating stirring blade, the peripheral speed at the tip of the stirring blade is 1 m / sec. The above is said to be high-speed rotation. 1 m / sec. Although it can be carried out at a low peripheral speed of less than, high-speed rotation is more advantageous in terms of shortening the time for dissolving the pigment and improving the certainty of dissolving the pigment. From the viewpoint of suppressing the generation of coarse particles, 1 m / sec. In addition, 10 m / sec. It is preferable to prepare the pigment solution at the above peripheral speed. As such a stirrer, various dispersers, for example, a high-speed rotation type emulsifying disperser (manufactured by M Technique Co., Ltd., product name: CLEARMIX) are suitable.

The concentration of the diketopyrrolopyrrole pigment base in the pigment solution is preferably higher from the viewpoint of productivity. The content is preferably 3% by weight or more, more preferably 5% by weight or more.

The pigment solution is mixed with the poor solvent to precipitate pigment fine particles. The solvent used as the poor solvent can be selected from the solvents listed as good solvents for dissolving the diketopyrrolopyrrole pigment raw material, but a solvent having low solubility in the organic pigment contained in the pigment solution is selected. There is a need. These solvents may be used alone or in combination of two or more. Moreover, an acid can be added for the purpose of adjusting pH, adjusting the particle size, and crystallinity. As the acid to be added, organic acids such as formic acid, acetic acid, propionic acid, citric acid and other carboxylic acids, benzenesulfonic acid, cyclohexanesulfonic acid, p-toluenesulfonic acid and other sulfonic acids, salicylic acid, cresol, thymol, etc. Phenols can be used. In addition, inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid, boric acid, phosphoric acid, hexafluorophosphoric acid, sulfamic acid, and perchloric acid can also be used. These may be used alone or in combination of two or more. By adding an acid, it may be possible to further improve the color properties. Furthermore, also in preparation of a poor solvent, it is preferable to use the stirrer which has the rotating stirring blade mentioned above similarly to preparation of a pigment solution.

The pigment solution is mixed with a poor solvent to precipitate pigment fine particles. As described above, the mixing of the two is preferably performed continuously between the relatively rotating processing surfaces that can approach and leave.

The temperature at which the pigment fine particles are precipitated is important for adjusting the primary particle diameter and controlling the crystallite size. Specifically, finer particles can be precipitated by adjusting the temperature of both the pigment solution and the poor solvent so that the temperature during precipitation is 50 ° C. or lower. Particularly preferably, the temperature during precipitation is 30 ° C. or less. When the pigment fine particles are precipitated at a high temperature exceeding 50 ° C., the crystal growth of the pigment fine particles is promoted and coarse particles are precipitated, whereas when the pigment fine particles are precipitated at 50 ° C. or less. Thus, it can be presumed that the crystal growth of the fine particles is suppressed, and pigment fine particles having a small crystallite size and a primary particle diameter are fine and uniform.

A slurry containing pigment fine particles obtained by mixing the pigment solution and a poor solvent and precipitating the pigment fine particles is used to remove the pigment fine particles from the liquid using methods such as filtration, centrifugation, dialysis, and ultrafiltration. The pigment fine particles of the present invention can be isolated by taking out and washing with various solvents.
The solvent used for washing can be selected from the solvents listed as good solvents for dissolving the above-mentioned diketopyrrolopyrrole pigment base. Moreover, it is preferable to use the stirrer which has the rotating stirring blade mentioned above in the case of a washing process. The end point of the cleaning is not particularly limited, but can be determined using the pH of the cleaning liquid, analysis of impurities ions and organic substances. Moreover, since the pigment fine particles after washing are in a state containing the solvent used for washing when the washing is completed, it is necessary to perform a drying or solvent replacement treatment.

The drying method is not particularly limited, and examples thereof include vacuum drying, hot air drying, and freeze drying. It is possible to obtain pigment fine particle powder by drying.

The method of solvent replacement is not particularly limited, but the pigment fine particle wet cake containing the cleaning liquid obtained after the completion of the cleaning is put into the target solvent, and is uniformly stirred, and then filtered, centrifuged, dialyzed, Using a method such as ultrafiltration, it is possible to prepare a wet cake of pigment fine particles containing a target solvent.

It can be said that the precipitation of pigment fine particles by the reprecipitation method and the cleaning treatment of the pigment fine particles thus precipitated involve not only the precipitation of pigment fine particles but also the purification of the pigment raw material. It is assumed that the impurities such as metals and unreacted substances incorporated in the pigment fine particles are extracted by dissolving the pigment raw material to the molecular state, and these impurities are removed by washing after the pigment fine particles are deposited. The The inventors consider that one of the reasons that the coloring power of the pigment fine particles by the reprecipitation method is superior to the salt milling method represented by Patent Documents 1 and 2 is the purification of the pigment raw material. Yes.

When the amount of Fe contained in the pigment fine particles is large, when a color filter is produced using the pigment fine particles, there is a possibility of causing a malfunction of the liquid crystal due to a decrease in voltage holding ratio. In addition, since the amount of Fe contained in the pigment fine particles is large, the amount of impurities contained in the color filter is increased, leading to a decrease in color characteristics and coloring power. There is a possibility of causing foreign matter on the film. Therefore, it is necessary to reduce the amount of Fe contained in the pigment fine particles as much as possible. It has been found that the amount of Fe can be reduced by the refining method of the pigment raw material by the reprecipitation method described above. For this reason, the content of Fe in the pigment fine particles can be suppressed to 35 ppm or less. More preferably, it can be suppressed to 30 ppm or less, more preferably 20 ppm or less.
[Example of manufacturing equipment]

Here, the fluid processing apparatus provided with the above-described relatively rotating processing surface that can be approached / separated will be briefly described with reference to FIGS. This apparatus is the same as the apparatus described in Patent Document 7.
In FIG. 1, U indicates the upper side, and S indicates the lower side. However, in the present invention, the upper, lower, front, rear, left and right only indicate relative positional relationships, and do not specify an absolute position. 2A and 3B, R indicates the direction of rotation. In FIG. 3B, C indicates the centrifugal force direction (radial direction).

This fluid processing apparatus includes first and second processing units 10 and 20 that face each other, and at least one processing unit rotates. The opposing surfaces of both processing parts 10 and 20 are processing surfaces. The first processing unit 10 includes a first processing surface 1, and the second processing unit 20 includes a second processing surface 2.

Both processing surfaces 1 and 2 are connected to a flow path of fluid (that is, the pigment solution and the poor solvent), and constitute part of the flow path of the fluid to be processed. The distance between the processing surfaces 1 and 2 can be changed as appropriate, but is usually adjusted to 1 mm or less, for example, a minute distance of about 0.1 μm to 50 μm. As a result, the fluid to be processed that passes between the processing surfaces 1 and 2 becomes a forced thin film fluid forced by the processing surfaces 1 and 2.

When processing a plurality of fluids using this device, the device is connected to the flow path of the first fluid and forms part of the flow path of the first fluid. Furthermore, this device forms a part of the flow path of the second fluid, which is different from the first fluid. Then, this apparatus performs fluid processing in which both flow paths are merged, and both fluids are mixed and reacted between the processing surfaces 1 and 2 to precipitate fine particles.

More specifically, this apparatus includes a first holder 11 that holds the first processing portion 10, a second holder 21 that holds the second processing portion 20, a contact pressure application mechanism, and a rotation. A drive mechanism, a first introduction part d1, a second introduction part d2, and a fluid pressure application mechanism p are provided.

As shown in FIG. 2A, in this embodiment, the first processing portion 10 is an annular body, more specifically a ring-shaped disk. The second processing unit 20 is also a ring-shaped disk. In this embodiment, the processing portions 10 and 20 have the first and second processing surfaces 1 and 2 facing each other mirror-polished, and the arithmetic average roughness is not particularly limited, but preferably 0.01 to 1.0 μm, more preferably 0.03 to 0.3 μm.

At least one of the first holder 11 and the second holder 21 can be rotated relative to the other holder by a rotation drive mechanism (not shown) such as an electric motor.
In this embodiment, the second holder 21 is fixed to the apparatus, and the first holder 11 attached to the rotary shaft 50 of the rotational drive mechanism fixed to the apparatus is rotated and supported by the first holder 11. The first processing unit 10 thus rotated rotates with respect to the second processing unit 20. Of course, the second processing unit 20 may be rotated, or both may be rotated.

In this embodiment, the second processing unit 20 approaches and separates from the first processing unit 10 in the direction of the rotation shaft 50, and the storage unit 41 provided in the second holder 21 2 A portion of the processing portion 20 opposite to the processing surface 2 side is accommodated so that it can appear and disappear. However, conversely, the first processing unit 10 may approach or separate from the second processing unit 20, and both the processing units 10 and 20 approach or separate from each other. It may be a thing.

This accommodating part 41 is a recessed part which accommodates the site | part on the opposite side to the process surface 2 side of the 2nd process part 20, and is a groove | channel formed in cyclic | annular form. The accommodating portion 41 accommodates the second processing portion 20 with a sufficient clearance that allows the portion of the second processing portion 20 on the side opposite to the processing surface 2 side to appear. The second processing unit 20 may be arranged so that only the parallel movement is possible in the axial direction, but by increasing the clearance, the second processing unit 20 is The center line of the processing part 20 may be tilted and displaced so as to break the relationship parallel to the axial direction of the storage part 41. Furthermore, the center line of the second processing part 20 and the storage part 41 may be displaced. The center line may be displaced so as to deviate in the radial direction. As described above, it is desirable to hold the second processing unit 20 by the floating mechanism that holds the three-dimensionally displaceably.

The fluid is applied between the first introduction part d1 and the second introduction part d2 between the processing surfaces 1 and 2 in a state where pressure is applied by a fluid pressure application mechanism p configured by a pump, potential energy, and the like. be introduced. In this embodiment, the first introduction part d1 is a passage provided in the center of the annular second holder 21, and one end of the first introduction part d1 is formed on both processing surfaces from the inside of the annular processing parts 10, 20. It is introduced between 1 and 2. The second introduction part d2 supplies a second fluid that reacts with the first fluid to the processing surfaces 1 and 2. In this embodiment, the second introduction portion d2 is a passage provided inside the second processing portion 20, and one end thereof is an opening d20 formed in the second processing surface.
The first fluid pressurized by the fluid pressure applying mechanism p is introduced from the first introduction part d1 into the space inside the processing parts 10 and 20, and the first processing surface 1 and the second processing surface. 2 and try to pass outside both processing parts 10 and 20.
Between these processing surfaces 1 and 2, the second fluid pressurized by the fluid pressure applying mechanism p is supplied from the second introduction part d <b> 2, merges with the first fluid, and the two fluids are mixed. Pigment fine particles are precipitated by the precipitation reaction between the pigment solution and the poor solvent, and the fluid containing the pigment fine particles is discharged from both processing surfaces 1 and 2 to the outside of both processing parts 10 and 20. .

The contact surface pressure applying mechanism applies to the processing portion a force that causes the first processing surface 1 and the second processing surface 2 to approach each other. In this embodiment, the contact pressure applying mechanism is provided in the second holder 21 and biases the second processing portion 20 toward the first processing portion 10.

The contact surface pressure applying mechanism described above is a force that pushes the first processing surface 1 of the first processing member 10 and the second processing surface 2 of the second processing member 20 in the approaching direction (hereinafter referred to as contact pressure). It is a mechanism for generating. By maintaining a balance between the contact surface pressure and the force that separates the processing surfaces 1 and 2 due to the fluid pressure, the distance between the processing surfaces 1 and 2 is maintained at a predetermined minute interval, and the unit of nm or μm. A thin film fluid having a minute film thickness is generated. The contact surface pressure may be other force such as magnetic force or gravity in addition to the elastic force of the spring 43, the pressure of the urging fluid such as air or oil introduced into the urging fluid introducing portion 44. .

The second processing unit 20 is separated from the first processing unit 10 by a separation force generated by the pressure or viscosity of the fluid pressurized by the fluid pressure application mechanism p against the urging force of the contact surface pressure application mechanism. Keep a small gap between the processing surfaces. Thus, the distance between the first processing surface 1 and the second processing surface 2 is set with an accuracy of μm by the balance between the contact surface pressure and the separation force.
The separation force includes the fluid pressure and viscosity of the fluid, the centrifugal force due to the rotation of the processing portion, the negative pressure when negative pressure is applied to the biasing fluid introduction portion 44, and the spring 43 as the tension spring. In this case, the elastic force can be given. This contact surface pressure imparting mechanism may be provided not in the second processing unit 20 but in the first processing unit 10 or in both.

As shown in FIG. 2, a groove-like recess 13 extending from the center side of the first processing portion 10 to the outside, that is, in the radial direction is formed on the first processing surface 1 of the first processing portion 10. May be implemented. As shown in FIG. 2 (B), the planar shape of the recess 13 may be curved or spirally extended on the first processing surface 1. Further, the concave portion 13 can be implemented as one formed on the second processing surface 2, and can also be implemented as one formed on both the first and second processing surfaces 1, 2. By forming such a recess 13, a micropump effect can be obtained, and there is an effect that a fluid can be sucked between the first and second processing surfaces 1 and 2.

It is desirable that the base end of the recess 13 reaches the inner periphery of the first processing unit 10. The tip of the recess 13 extends toward the outer peripheral surface of the first processing surface 1, and the depth gradually decreases from the base end toward the tip.
A flat surface 16 without the recess 13 is provided between the tip of the recess 13 and the outer peripheral surface of the first processing surface 1.

The opening d20 is preferably provided at a position facing the flat surface 16 of the first processing surface 1.
In particular, the flat surface 16 on the downstream side (outside in this example) from the point where the flow direction when introduced by the micropump effect is converted into a laminar flow direction in a spiral shape formed between the processing surfaces. It is desirable to install it at a position opposite to.
Specifically, in FIG. 2B, the distance n in the radial direction from the tip of the recess 13 provided in the first processing surface 1 is preferably about 0.5 mm or more. Thereby, mixing of a plurality of fluids and precipitation of fine particles can be performed under laminar flow conditions.

The shape of the opening d20 may be circular as shown in FIGS. 2B and 3B, and as shown by a dotted line in FIG. 2B, the processing surface is a ring-shaped disk. A concentric ring shape surrounding the central opening of the two may be used.
In order to easily obtain fine pigment particles with controlled crystallite size and primary particle diameter according to the present invention, the shape of the opening d20 is a concentric ring shape surrounding the central opening of the processing surface 2. More preferable. Both fluids come into contact quickly, the concentration distribution of both fluids in the reaction field between the processing surfaces is suppressed, and the mixed state becomes more uniform, so the degree of progress of the precipitation reaction becomes more uniform, and the resulting fine pigment particles are crystallized. It is estimated that the child size and the primary particle size become more uniform.

The second introduction part d2 can have directionality. For example, as shown in FIG. 3A, the introduction direction from the opening d20 of the second processing surface 2 is inclined with respect to the second processing surface 2 at a predetermined elevation angle (θ1). . The elevation angle (θ1) is set to be more than 0 degrees and less than 90 degrees, and in the case of a reaction with a higher reaction rate, it is preferably set at 1 to 45 degrees.

Further, as shown in FIG. 3B, the introduction direction from the opening d <b> 20 of the second processing surface 2 has directionality in the plane along the second processing surface 2. . The introduction direction of the second fluid is a component in the radial direction of the processing surface that is an outward direction away from the center and a component with respect to the rotation direction of the fluid between the rotating processing surfaces. Is forward. In other words, a line segment in the radial direction passing through the opening d20 and extending outward is defined as a reference line g and has a predetermined angle (θ2) from the reference line g to the rotation direction R. This angle (θ2) is also preferably set to more than 0 degree and less than 90 degrees.

This angle (θ2) can be changed and carried out according to various conditions such as reaction rate, viscosity, and rotational speed of the processing surface. In addition, the second introduction part d2 may not have any directionality.

The number of the above-mentioned flow paths is two in the example of FIG. 1, but may be three or more. In the example of FIG. 1, the second fluid is introduced between the processing surfaces 1 and 2 from the second introduction part d2, but this introduction part may be provided in the first processing part 10 or provided in both. Good. Moreover, you may prepare several introduction parts with respect to one type of fluid. In addition, the shape, size, and number of the opening for introduction provided in each processing portion are not particularly limited, and can be appropriately changed. Further, an opening for introduction may be provided immediately before or between the first and second processing surfaces 1 and 2 or further upstream.

Control of the ratio of crystallite size to crystallite size by the production method and reaction apparatus described above is performed by various parameters for controlling the reaction coefficient in the reaction field, such as temperature, distance between processing surfaces, supply of fluid, and This is possible by controlling the discharge speed and the like, and feeding back from the crystallite size of the obtained pigment fine particles to select an optimum value for each apparatus.

(Pigment dispersion)
In the present invention, a pigment dispersion can be obtained by introducing the above-described diketopyrrolopyrrole pigment fine particles according to the present invention into an organic solvent that is a dispersion medium and subjecting it to a dispersion treatment. The organic solvent is usually preferably an ester organic solvent. The ester organic solvent used here is not particularly limited, but is preferably a high-boiling organic solvent having a boiling point of preferably 100 ° C. or higher, more preferably 110 ° C. or higher, and still more preferably 130 ° C. or higher. Examples of such high boiling point organic solvents include ethylene glycol monomethyl ether propionate, ethylene glycol monoethyl ether propionate, propylene glycol monomethyl ether propionate, propylene glycol monoethyl ether propionate, ethylene glycol monomethyl ether acetate, Examples include ethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether (PGME), propylene glycol monomethyl ether acetate (PGMEA), propylene glycol monoethyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monobutyl ether acetate (BCA) and the like.
Among the ester organic solvents, propylene glycol monomethyl ether acetate (boiling point: 146 ° C.) and propylene glycol monomethyl ether (boiling point: 120 ° C.) are more preferable from the viewpoint of dispersibility of the organic pigment. Said ester organic solvent can be used individually or in combination of 2 or more types.

Moreover, a dispersing agent can be added as needed. Although it does not specifically limit as this dispersing agent, For example, mainly in organic solvent system, carboxylic acid ester, such as polyurethane and polyacrylate, unsaturated polyamide, polycarboxylic acid (partial) amine salt, polycarboxylic acid ammonium salt, polycarboxylic acid alkyl Amides formed by the reaction of amine salts, polysiloxanes, long-chain polyaminoamide phosphates, hydroxyl group-containing polycarboxylic acid esters and their modified products, poly (lower alkyleneimine) and polyesters having free carboxylic acid groups In the case of aqueous, (meth) acrylic acid-styrene copolymer, (meth) acrylic acid- (meth) acrylic acid ester copolymer, styrene-maleic acid copolymer, polyvinyl alcohol, polyvinylpyrrolidone, etc. Water-soluble resins and water-soluble polymer compounds; Sodium sulfate, polyoxyethylene alkyl ether sulfate, sodium dodecylbenzene sulfonate, alkali salt of styrene-acrylic acid copolymer, sodium stearate, sodium alkyl naphthalene sulfonate, sodium alkyl diphenyl ether disulfonate, monoethanolamine lauryl sulfate, Anionic surfactants such as triethanolamine lauryl sulfate, ammonium lauryl sulfate, monoethanolamine stearate, sodium stearate, sodium lauryl sulfate, monoethanolamine of styrene-acrylic acid copolymer, polyoxyethylene alkyl ether phosphate Polyoxyethylene lauryl ether, polyoxyethylene nonyl phenyl ether, polyoxyethylene alkyl ether phosphorus Nonionic surfactants such as esters, polyoxyethylene sorbitan monostearate, polyethylene glycol monolaurate; alkylbetaines such as alkyldimethylaminoacetic acid betaines, amphoteric surfactants such as alkylimidazolines, which may be used alone or Two or more kinds can be mixed and used.

Among these, a dispersant having an amine structure is excellent in dispersibility and is preferably used. Examples of the dispersant having such an amine structure include Solsperse series manufactured by Lubrizol, Disperbyk series manufactured by Big Chemie, Efka series manufactured by BASF, and Ajisper series manufactured by Ajinomoto Finetech. The amount of the dispersant is usually 100 parts by weight or less, preferably 50 parts by weight or less, and more preferably 30 parts by weight or less with respect to 100 parts by weight of the pigment.

Further, a binder resin can be added together with the dispersant. Examples of the binder resin include phenol resin, alkyd resin, polyester resin, amino resin, urea resin, melamine resin, guanamine resin, epoxy resin, styrene resin, vinyl resin, vinyl chloride resin, vinyl chloride / vinyl acetate copolymer resin, Acrylic resin, polyurethane resin, silicone resin, polyamide resin, polyimide resin, rubber resin, cyclized rubber, maleated oil resin, butyral resin, polybutadiene resin, cellulose resin, chlorinated polyethylene, chlorinated polypropylene, etc. Can be mentioned. These binder resins can be used alone or in combination of two or more. Binder resin can also be added when obtaining the photosensitive coloring composition mentioned later.

Furthermore, you may add compounds, such as a well-known pigment derivative, as needed. These compounds mediate between the pigment and the dispersant, and are considered to have a function of improving the dispersion stability by physically, electrically and chemically adsorbing between the pigment surface and the dispersant. ing. Examples of such pigment derivatives include diketopyrrolopyrrole, anthraquinone, phthalocyanine, metal phthalocyanine, quinacridone, azochelate, azo, isoindolinone, pyranthrone, indanthrone, anthrapyrimidine Based on organic pigments such as dibromoanthanthrone, flavanthrone, perylene, perinone, quinophthalone, thioindigo, dioxazine, etc., such as hydroxyl group, carboxyl group, sulfonic acid group, carbonamide group, sulfonamide group, etc. Examples thereof include pigment derivatives into which a substituent is introduced. These compounds such as pigment derivatives can be used alone or in combination of two or more.

Addition of compounds such as these dispersants, binder resins, and pigment derivatives to the pigment dispersion also contributes to reduction of flocculation, improvement of pigment dispersion stability, and improvement of viscosity characteristics of the dispersion.

The dispersion treatment is not limited to the method and the disperser used for the treatment, but the energy such as excessive impact force on the pigment fine particles according to the present invention can be adjusted by adjusting the stirring speed and treatment time during the treatment. Distributed processing is possible without dropping. For this reason, it is possible to use a pigment that disperses the object to be processed by vigorously stirring media composed of glass, steel, stainless steel, ceramics, zircon, zirconia, etc. with a stirring mechanism such as a ball mill, a bead mill, or a sand mill. It can be carried out even under conditions that do not involve pulverization of fine particles. Furthermore, the dispersion treatment can also be performed by using a disperser that does not use the media. In that case, the same apparatus as that used for preparing the pigment solution or the poor solvent can be used. By reducing the pulverization of fine pigment particles, it is possible to improve the homogeneity of the fine pigment particles after the dispersion treatment, thereby contributing to the improvement of color characteristics. It is advantageous in that it is easy to obtain the effect that it can be done.

[Photosensitive coloring composition]
A photosensitive coloring composition can be obtained by mixing at least a monomer and a photopolymerization initiator into the pigment dispersion.
Monomers include, but are not limited to, monofunctional monomers such as nonylphenyl carbitol acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-ethylhexyl carbitol acrylate, 2-hydroxyethyl acrylate and N-vinyl pyrrolidone. , Bifunctional monomers such as tripropylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, polyethylene glycol diacrylate and bisphenol A diacrylate, trifunctional such as trimethylolpropane triacrylate and pentaerythritol triacrylate Monomers, other polyfunctional monomers such as dipentaerythritol penta and hexaacrylate, etc. That. Two or more kinds of these photopolymerizable monomers can be used.
Photopolymerization initiators include aromatic ketones, lophine dimers, benzoins, benzoin ethers, acetophenones, benzophenones, thioxanthones, ketals, quinones, triazines, imidazoles, oxime esters, phosphines , Borates, carbazoles, titanocenes, polyhalogens and the like. For example, a combination of 4,4′-bis (diethylamino) benzophenone and 2- (o-chlorophenyl) -4,5-diphenylimidazole dimer, 4- [pN, N-di (ethoxycarbonylmethyl) -2, 6-di (trichloromethyl) -s-triazine], 2-methyl-4 ′-(methylthio) -2-morpholinopropiophenone is preferred. These photopolymerization initiators may be used singly or in combination of two or more at any ratio as necessary.

In addition, the following alkali-soluble resins can be included in the photosensitive coloring composition.
As the alkali-soluble resin, those generally used for negative resists can be used, and any resin that is soluble in an alkaline aqueous solution may be used. For example, methyl (meth) 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 ( One or more selected from (meth) acrylate, styrene, γ-methylstyrene, N-vinyl-2-pyrrolidone, glycidyl (meth) acrylate, and the like, (meth) acrylic acid, itaconic acid, crotonic acid, maleic acid, Fumaric acid, vinyl vinegar , A copolymer consisting of one or more selected from among these anhydrides can be exemplified, polymers obtained by adding an ethylenically unsaturated compound having a glycidyl group or hydroxyl group of the above copolymer, etc. may be exemplified. These alkali-soluble resins can be added when obtaining the above-mentioned pigment dispersion.

The photosensitive coloring composition of the present invention may further contain additives such as a filler, an adhesion promoter, an antioxidant, an ultraviolet absorber, and a leveling agent.

〔Color filter〕
A color filter can be produced by coating the photosensitive coloring composition containing the pigment fine particles according to the present invention described above on a substrate, photocuring, and developing to obtain a coating film. Hereinafter, this process is referred to as a pre-baking process. The photosensitive coloring composition is preferably applied onto a substrate by a roll coater, slit coater, spray, bar coater, applicator, spin coater, dip coater, inkjet, or screen printing on a glass substrate or a silicon substrate. . After coating, the organic solvent is preferably dried and heated from the viewpoint of smoothness of the coating film and handling. The heating temperature is preferably 50 to 140 ° C, more preferably 70 to 90 ° C. The heating time is preferably 0.5 to 60 minutes, more preferably 1 to 10 minutes.
In photocuring, the coating film is cured by irradiating the coating film with ultraviolet rays. Photocuring is performed to leave a pattern on the glass substrate in the subsequent development, and it is preferable not to cure the portion removed by development by placing a photomask for preventing ultraviolet rays. The photocuring is preferably performed until the ultraviolet irradiation amount is 10 to 100 mJ / cm ² . In the development, the cured coating film after photocuring is immersed in an aqueous alkaline solution, and then rinsed with water to remove uncured portions. As the aqueous alkali solution used, the concentration of the alkaline agent is preferably 0.001 to 10% by weight, and preferably 0.01 to 1% by weight. The alkaline agent used for development is preferably an aqueous solution of ammonia, sodium hydroxide, potassium hydroxide, calcium hydroxide, sodium carbonate, potassium carbonate, triethylamine, triethanolamine, tetramethylammonium hydroxide, or the like.
About the film thickness of a coating film, it adjusts so that desired chromaticity may be obtained. This is because the chromaticity also depends on the film thickness.

The coated film after development is heated to 200 to 300 ° C. to obtain a cured film. Hereinafter, this process is referred to as a post-baking process. By heating the coated film after development, a cured film having excellent hardness can be formed. From the viewpoint of obtaining a cured film having excellent hardness and excellent heat resistance, the heating temperature is preferably 200 to 300 ° C. From the viewpoint of obtaining a cured film having excellent hardness and excellent heat resistance, the heating time is preferably 10 to 300 minutes. Prior to the post-baking step, preheating may be performed at 80 to 100 ° C. for 10 to 60 minutes.

EXAMPLES Hereinafter, although an Example is given and the invention of this application is demonstrated in more detail, this invention is not limited only to these Examples.

In the following examples, the symbols indicate the following contents. Hereinafter, wt% is described as wt%. DMSO: dimethyl sulfoxide, NMP: N-methylpyrrolidone, TMAH aq. : 25 wt% tetramethylammonium hydroxide aqueous solution, BTMA sol. : 40 wt% benzyltrimethylammonium hydroxide in methanol solution, EG: ethylene glycol, MeOH: methanol.

(Production of brominated diketopyrrolopyrrole)
1. Production of alkali metal salt of diketopyrrolopyrrole pigment compound To a stainless steel reaction vessel equipped with a reflux tube, 200 parts of tert-amyl alcohol dehydrated with molecular sieves and 140 parts of sodium tert-amyl alkoxide were added in a nitrogen atmosphere. The mixture was heated to 100 ° C. with stirring to prepare an alcoholate solution. Next, 88 parts of diisopropyl succinate and 153.6 parts of 4-bromobenzonitrile were added to a glass flask and dissolved by heating to 90 ° C. with stirring to prepare a solution of these mixtures. The heated solution of the mixture was slowly dropped into the alcoholate solution heated to 100 ° C. at a constant rate over 2 hours with vigorous stirring. After completion of the dropwise addition, heating and stirring were continued at 90 ° C. for 2 hours to obtain an alkali metal salt solution of a diketopyrrolopyrrole pigment compound.

2. Production of Red Suspension Further, 600 parts of methanol, 600 parts of water and 114 parts of acetic acid were added to a reaction vessel equipped with a glass jacket, and cooled to −10 ° C. The cooled mixture was rotated with a high-speed stirring disperser at 4000 rpm while rotating a shear disk of 8 cm in diameter, and the mixture was cooled to 75 ° C., and the alkali metal of the previously obtained diketopyrrolopyrrole pigment compound was obtained. The salt solution was added in small portions. At this time, addition of an alkali metal salt solution of a diketopyrrolopyrrole pigment compound at 75 ° C. while cooling so that the temperature of the mixture consisting of methanol, acetic acid and water is always kept at −5 ° C. or lower. The amount was added in small portions over approximately 120 minutes while adjusting the speed to do. After the alkali metal salt solution was added, red crystals were precipitated, and a red suspension was obtained.

3. Fractionation of brominated diketopyrrolopyrrole Subsequently, the resulting red suspension was filtered at 5 ° C. with an ultrafiltration device to obtain a red paste. The paste was redispersed in 3500 parts of water at 25 ° C., washed, and filtered with an ultrafiltration device three times. The obtained water paste of diketopyrrolopyrrole pigment compound is dried at 60 ° C. for 72 hours and pulverized to form a brominated diketopyrrolopyrrole (hereinafter, “ 150.8 parts of (described as “brominated DPP”) (with a primary particle diameter of 40 to 60 nm by STEM observation described later).

Example 1
Fine pigmentation (preparation of pigment solution)
As a solvent to be a base material in Table 2, 60% by weight of DMSO of raw material 1 and TMAH aq. 28 wt%, brominated DPP 9 wt%, and raw material 4 EG 3 wt% were added and stirred using a high-speed rotary emulsion disperser (M Technique Co., Ltd., product name: CLEARMIX, hereinafter referred to as “CLEAMIX”). Then brominated DPP was dissolved. The formulation and preparation conditions are shown in Table 2 together with other examples and comparative examples.

(Preparation of poor solvent)
As a poor solvent, 20 wt% of citric acid of raw material 2 and 10 wt% of EG of raw material 4 were added to 70 wt% of tap water of raw material 1 in Table 3 and mixed using CLEARMIX to prepare a poor solvent. Table 3 shows the formulation and preparation conditions together with other examples and comparative examples.

(Precipitation of pigment fine particles)
Using a reaction apparatus that is disposed in opposition and that can be diffused, stirred, and mixed uniformly in a thin film fluid formed between processing surfaces 1 and 2 that can be approached and separated, and at least one of which rotates relative to the other. Then, the prepared pigment solution and the poor solvent were mixed, and the precipitation reaction was continuously performed in the thin film fluid. Specifically, a poor solvent is sent as the first fluid from the center (first introduction part d1) of the apparatus shown in FIG. 1, and the processing surface 1 with the pigment solution as the second fluid from the second introduction part d2, Introduced between the two. The first fluid and the second fluid were mixed in a thin film fluid to precipitate pigment fine particles dissolved in the pigment solution, and the pigment fine particle dispersion was discharged from the processing surfaces 1 and 2. The supply pressure of the first fluid and the second fluid, the liquid supply flow rate and the liquid supply temperature, the rotational speed of the processing unit 10 (hereinafter referred to as the rotational speed), the back pressure, and the temperature of the discharge liquid are used as the pigment fine particle production conditions. The results are shown in Table 4 together with other examples and comparative examples. The liquid supply temperatures of the first fluid and the second fluid are measured immediately before the introduction of the device (more specifically, immediately before being introduced between the processing surfaces 1 and 2), respectively. The temperature of the discharge liquid is the temperature of the pigment fine particle dispersion immediately after being discharged from the processing surfaces 1 and 2. Further, as the opening d20 of the second introduction part d2, a concentric annular shape surrounding the central opening of the processing surface 2 was used as shown by a dotted line in FIG.

(Washing and drying)
(A) In order to fractionate only the pigment fine particles from the pigment fine particle dispersion discharged from the processing surfaces 1 and 2, the pigment fine particles are loosely aggregated and subjected to vacuum filtration (−0.1 MPaG) using filter paper. The pigment fine particles were collected by filtration.

(B) The obtained pigment fine particle wet cake is put into 5 L of tap water, stirred and washed at 6000 rpm for 1.5 minutes using CLEARMIX, and the washed liquid is recovered again by vacuum filtration. The operation was repeated four times to obtain a wet cake of fine pigment particles. The resulting pigment fine particle wet cake was vacuum dried to obtain a pigment fine particle dry powder. Vacuum drying was performed at 30 ° C. and −0.10 MPaG for 72 hours.
The obtained dried powder of pigment fine particles was subjected to X-ray diffraction measurement using a multipurpose X-ray diffractometer X'Pert Powder (manufactured by Panalical), and data analysis software HighScorePlus Ver. Analysis was performed using 3.0e (3.0.5) (Panalytical).
Further, ICP quantitative analysis was performed, and the amount of Fe contained in the pigment fine particles was measured.

Preparation of Pigment Dispersion 10 parts by weight of the obtained dry powder of pigment fine particles, 5 parts by weight of “BYKLPN6919” (manufactured by Big Chemie) as a dispersant, and C.I. I. 1 part by weight of a sulfonated derivative of Pigment Red 254 (hereinafter referred to as “R254”) and 70 parts by weight of propylene glycol monomethyl ether acetate (hereinafter referred to as “PGMEA”) as a solvent were stirred and mixed with a paint shaker (manufactured by Asada Tekko Co., Ltd.). Dispersion treatment was carried out for 6 hours to obtain a brominated DPP pigment dispersion. The viscosity of the obtained pigment dispersion was measured. The obtained pigment dispersion was diluted with PGMEA to obtain a dispersion for STEM observation. The obtained dispersion for STEM observation was dropped on the grid, and STEM observation was performed.

In order to adjust the chromaticity, C.I. I. Pigment Red 177 (hereinafter “R177”) pigment dispersion was prepared. As for the pigment dispersion of R177, 10 parts by weight of “chromofine red A3B” (manufactured by BASF) as a pigment, 5 parts by weight of “BYKLPN6919” (manufactured by BYK Chemie) as a dispersant, as a dispersion aid Preparation was carried out in the same manner as in the preparation of the brominated DPP pigment dispersion with a composition of 1 part by weight of a sulfonated derivative of R177 and 70 parts by weight of PGMEA as a solvent.

Preparation of Photosensitive Coloring Composition With respect to the brominated DPP pigment dispersion and R177 pigment dispersion, each photosensitive coloring composition was prepared by the following production method.
50 parts by weight of pigment dispersion, 6 parts by weight of acrylic resin (“ZAH-110” manufactured by Soken Chemical Co., Ltd.), 4 parts by weight of dipentaerythritol hexaacrylate as a polymerizable monomer, 2-methyl-1-as a photopolymerization initiator 1 part by weight of (4-methylthiophenyl) -2-morpholinopropan-1-one (“IRGACURE 907” manufactured by BASF) and 100 parts by weight of PGMEA as a solvent were stirred and mixed uniformly, and then a 1.0 μm filter. To obtain a photosensitive coloring composition.

Preparation of cured film About the cured film, it produced about the following 2 types.
Using a photosensitive coloring composition of brominated DPP, a cured film having a chromaticity adjusted so that the chromaticity x = 0.6500 during the post-baking process is prepared, and the coarse particles, contrast, film thickness, and heat resistance Evaluation was performed.
Using a photosensitive coloring composition of brominated DPP and R177, a cured film having a chromaticity adjusted so that chromaticity x = 0.6500 and y = 0.3230 during a post-baking process was prepared, and luminance was evaluated. Went.

1. Pre-baking process After apply | coating the photosensitive coloring composition obtained above on the glass substrate with a spin coater, it dried at 80 degreeC and 3 minutes, and obtained the coating film. A photomask was placed on the obtained coating film, and ultraviolet rays of 100 mJ / cm ² were irradiated using an ultraviolet fiber spot irradiation device. Further, it was vibrated in an alkaline aqueous solution (0.04 wt% potassium hydroxide aqueous solution) and then rinsed with pure water to remove uncured portions. The spin coater rotation speed was changed so as to sandwich the designated chromaticity, and three coating films were prepared so that the evaluation item for the designated chromaticity could be calculated by the primary correlation method.

2. Post-baking process The coating film from which the uncured portion was removed was preheated in a dryer at 80 ° C. for 30 minutes, and then heat-treated at 230 ° C. for 30 minutes to obtain a cured film.

Example 2
A cured film was obtained in the same manner as in Example 1 except that the formulation of the pigment solution shown in Table 2, the formulation of the poor solvent shown in Table 3, and the pigment fine particle production conditions shown in Table 4 were changed.

Example 3
Except having changed into the poor solvent prescription of Table 3, it carried out similarly to Example 1 and obtained the cured film.

Example 4
A cured film was obtained in the same manner as in Example 1 except that the pigment fine particle production conditions shown in Table 4 were changed.

Example 5
A cured film was obtained in the same manner as in Example 1 except that the formulation of the pigment solution shown in Table 2 was changed.

Example 6
A cured film was obtained in the same manner as in Example 2 except that the formulation of the pigment solution shown in Table 2 and the poor solvent formulation shown in Table 3 were changed.

Comparative Example 1
As a comparative example in which pigment micronization is not performed, brominated DPP used as a pigment raw material in Examples 1 to 6 was prepared in the same manner as in Example 1 without pigment micronization, and a pigment dispersion was prepared. Thereafter, a cured film was obtained in the same manner.

Comparative Example 2
As Comparative Example 2, the color characteristics and the primary particle diameter of pigment fine particles produced using pulverization and changes thereof will be described. The process for preparing pigment fine particles by the pulverization method was carried out as follows in accordance with Japanese Patent Application Laid-Open No. 2013-82905, which is well known as a document for the salt milling method.

50 parts by weight of brominated DPP, 550 parts by weight of sodium chloride, and 110 parts by weight of diethylene glycol were charged into a kneader and kneaded by a salt milling method at 50 ° C. for 4 hours to prepare a pigment fine particle kneaded product.

In order to remove impurities from the obtained pigment fine particle kneaded material, the obtained pigment fine particle kneaded material was put into 5 L of tap water, stirred and washed at 6000 rpm for 15 minutes using CLEARMIX, and washed. The pigment fine particles were collected by filtration under reduced pressure (-0.1 MPaG) using a filter paper. The pigment fine particle wet cake collected by filtration was washed and dried in the same manner as in Example 1. Thereafter, a pigment dispersion was prepared in the same manner as in Example 1, and thereafter a cured film was obtained in the same manner.

Comparative Example 3
350 mL of the pigment solution prepared in Example 2 using a burette in 5 L of the poor solvent prepared in Example 2 that was stirred at 1700 rpm using Claremix was 35 mL / min. The pigment fine particle dispersion was obtained. In order to separate only the pigment fine particles from the pigment fine particle dispersion, the pigment fine particles are loosely aggregated, and the pigment fine particles are collected by filtration under reduced pressure (−0.1 MPaG) using a filter paper. The wet cake was washed and dried in the same manner as in Example 1. Thereafter, a pigment dispersion was prepared in the same manner as in Example 1, and thereafter a cured film was obtained in the same manner.

Evaluation Method According to the above-mentioned [Measurement of crystallite size], the crystallite size was measured, and the crystallite size ratio was calculated. Further, the rate of change in the interplanar spacing was calculated from the above-mentioned [rate of change in interplanar spacing of crystal lattice plane].
These results are shown in Table 5.
As shown in FIG. 4, the X-ray diffraction pattern of brominated DPP is different from that of R254, but the peak position appears in the same place, so brominated DPP is the same as R254. The analysis was performed assuming that the crystal structure and the lattice plane of the crystal structure were taken.
As described above, the crystal structure of R254 has been analyzed by X-ray crystal structure analysis in the literature (Acta. Cryst. B49, 1056 (1993)), and the crystal structure is disclosed in the CIF data format. If this crystal structure CIF data is used, the Bragg angle (2θ) can be made to correspond to the lattice plane of the crystal structure by the calculation software Mercury.

The measurement of the amount of Fe by ICP qualitative analysis was performed using iCAP6300Duo manufactured by Thermo Fisher Scientific. Table 5 shows the measurement results.

The obtained pigment dispersion was diluted 50 to 200 times with PGMEA, treated with an ultrasonic homogenizer (manufactured by SND Co., Ltd., ultrasonic cleaner US-105) for 5 minutes, and then the particle image was observed. . For this observation, an S-5200 field emission scanning electron microscope (manufactured by Hitachi High-Technologies Corporation) was used at an observation magnification of 1 million with an acceleration voltage of 20 kV, and 100 particles that could be clearly identified from the observed image. The major axis was measured using image analysis software for SEM (Scandium manufactured by OLYMPUS), and the average primary particle size, the standard deviation of the primary particle size, and the CV value of the primary particle size were calculated.
These results and the viscosity of the pigment dispersion are shown in Table 5. In addition, Table 5 shows the number of coarse particles and color evaluation results (contrast, brightness, film thickness, and heat resistance) that can be visually confirmed when the obtained cured film is observed with an optical microscope at 500 times. The color evaluation values shown in Table 5 were adjusted so that x = 0.6500 and y = 0.3230 for luminance, and x = 0.6500 for contrast, film thickness, and heat resistance. The measurement was performed on the cured film.

Among the measurement results shown in Table 5, 0-19: ○, 20-59: Δ, 60 or more: x for coarse particles (pieces), 7000 or more: ○, 5000-6999: Δ, 4999 or less for contrast. : X, luminance is 18.90 or more: o, 18.80-18.89: Δ, 18.79 or less: x, film thickness (μm) is 2.400 or less: o, 2.401-2. 600: Δ, 2.601 or more: x, heat resistance (%) was determined to be 22.9 or less: ○, 23.0 or more: x, and shown in Table 5.

About the above measurement result, when all evaluation is (circle), comprehensive evaluation was set to (circle).

Examples 1 to 6 in which the crystallite size of the (1 1 1) plane is 140 mm or less and the crystallite size of the (1 5 -1) plane is 80 mm or less are the crystallite sizes of the (1 1 1) plane Compared with Comparative Examples 1 to 3 having a crystallite size exceeding 140 Å and having a crystallite size of (15 -1) plane exceeding 80 Å, the contrast and luminance were high. This is because the crystal grain size is controlled to be small, the area of the crystal grain boundary is reduced, and light scattering is reduced, so that the contrast and brightness of the obtained color filter are improved. In addition, it is considered that the primary particles are made up of small crystallites, whereby the primary particles become small, the color filter has a high transmittance, light scattering is kept low, and it contributes to the improvement of contrast and brightness.
Examples 1 to 6 in which the ratio of the crystallite size between the (1 1 1) plane and the (0 2 0) plane is in the range of 0.85 to 1.25 and the average primary particle diameter is 5 to 40 nm. Compared with Comparative Examples 1 to 3 having a ratio of crystallite sizes outside this range and an average primary particle diameter, the results were high in contrast and luminance. This means that the average primary particle size is small and the crystallite aspect ratio is small, making it easier to arrange the crystallites in the primary particles with little anisotropy, making the primary particles optically uniform, and contrast and brightness. I think that improved. In addition, primary particles composed of nearly spherical crystallites also have a small aspect ratio, making it difficult to orient in the cured film, and a decrease in the anisotropy of the cured film also contributed to the improvement in contrast and brightness. . Furthermore, since the aspect ratio of the primary particles is small, the specific surface area of the pigment fine particles formed from the primary particles is small, and the particle surface energy is small, so that aggregation of particles can be suppressed. The brominated DPP pigment dispersion of the present invention can ensure dispersion stability despite being a fine pigment that may cause thickening or gelation with time.
In Examples 1 to 6, in which the change rate of the interplanar spacing at 80 ° C. and 230 ° C. of the (0 2 0) plane of the crystal lattice is 3.0% or less, the change rate of the interplanar spacing exceeds 3.0%. As a result, heat resistance was higher than in Examples 1 to 3. From this, brominated DPP having a small rate of change in interplanar spacing due to heating shown in the examples has a specific crystallite size or a specific crystallite size ratio, so that the crystal grain boundaries in the crystal structure are suppressed to be small. It is considered that the crystallite has a stable crystal structure in which the crystallites are densely gathered, and the reduction in contrast due to heating can be alleviated.
From the above, it can be seen that by controlling various physical properties of brominated DPP, it is possible to obtain brominated DPP pigment fine particles satisfying characteristics required for a color filter such as contrast, brightness, and heat resistance at a high level.

Example 7
Fine pigmentation (preparation of pigment solution)
In Table 6, 65.5 wt% of DMSO of raw material 1 as a solvent serving as a base material, BTMA sol. 22.5 wt%, R254 of a commercially available pigment base material of raw material 3 (with a primary particle diameter of 100 to 120 nm by STEM observation described above) 12 wt% was added, and stirring was performed using CLEARMIX to dissolve R254. . Table 6 shows the formulation and preparation conditions together with other examples and comparative examples.

(Preparation of poor solvent)
As a poor solvent, the formulation of the poor solvent prepared by charging 20 wt% of acetic acid of raw material 2 and 40 wt% of MeOH of raw material 3 into 40 wt% of tap water of raw material 1 in Table 7 and mixing using CLEARMIX Preparation conditions are shown in Table 7 together with other examples and comparative examples.

(Precipitation of pigment fine particles)
Using a reaction apparatus that is disposed in opposition and that can be diffused, stirred, and mixed uniformly in a thin film fluid formed between processing surfaces 1 and 2 that can be approached and separated, and at least one of which rotates relative to the other. Then, the prepared pigment solution and the poor solvent were mixed, and the precipitation reaction was continuously performed in the thin film fluid. Specifically, a poor solvent is sent as the first fluid from the center (first introduction part d1) of the apparatus shown in FIG. 1, and the processing surface 1 with the pigment solution as the second fluid from the second introduction part d2, Introduced between the two. The first fluid and the second fluid were mixed in a thin film fluid to precipitate pigment fine particles dissolved in the pigment solution, and the pigment fine particle dispersion was discharged from the processing surfaces 1 and 2. The supply pressure of the first fluid and the second fluid, the liquid supply flow rate and the liquid supply temperature, the rotational speed of the processing unit 10 (hereinafter referred to as the rotational speed), the back pressure, and the temperature of the discharge liquid are used as the pigment fine particle production conditions. The results are shown in Table 8 together with other examples and comparative examples. The liquid supply temperatures of the first fluid and the second fluid are measured immediately before the introduction of the device (more specifically, immediately before being introduced between the processing surfaces 1 and 2), respectively. The temperature of the discharge liquid is the temperature of the pigment fine particle dispersion immediately after being discharged from the processing surfaces 1 and 2. Further, as the opening d20 of the second introduction part d2, a concentric annular shape surrounding the central opening of the processing surface 2 was used as shown by a dotted line in FIG.

(Washing and drying)
(A) In order to fractionate only the pigment fine particles from the pigment fine particle dispersion discharged from the processing surfaces 1 and 2, the pigment fine particles are loosely aggregated and subjected to vacuum filtration (−0.1 MPaG) using filter paper. The pigment fine particles were collected by filtration.

(B) The obtained pigment fine particle wet cake is put into 5 L of tap water, stirred and washed at 6000 rpm for 1.5 minutes using CLEARMIX, and the washed liquid is recovered again by vacuum filtration. The operation was repeated four times to obtain a wet cake of fine pigment particles. The resulting pigment fine particle wet cake was vacuum dried to obtain a pigment fine particle dry powder. Vacuum drying was performed at 30 ° C. and −0.10 MPaG for 72 hours.
The obtained dried powder of pigment fine particles was subjected to X-ray diffraction measurement using a multipurpose X-ray diffractometer X'Pert Powder (manufactured by Panalical), and data analysis software HighScorePlus Ver. Analysis was performed using 3.0e (3.0.5) (Panalytical). Further, ICP quantitative analysis was performed, and the amount of Fe contained in the pigment fine particles was measured.

Preparation of Pigment Dispersion 10 parts by weight of the obtained dry powder of pigment fine particles, 5 parts by weight of “BYKLPN6919” (manufactured by Big Chemie) as a dispersant, and C.I. I. 1 part by weight of a sulfonated derivative of Pigment Red 254 and 70 parts by weight of propylene glycol monomethyl ether acetate (hereinafter “PGMEA”) as a solvent were stirred and mixed with a paint shaker (manufactured by Asada Tekko Co., Ltd.) and dispersed for 6 hours. A pigment dispersion was obtained. Further, the obtained pigment dispersion was diluted with PGMEA to obtain a dispersion for STEM observation. The obtained dispersion for STEM observation was dropped on the grid, and STEM observation was performed.
In order to adjust the chromaticity, a pigment dispersion of R177 was prepared by the same preparation method as described above.

Preparation of photosensitive coloring composition With respect to the pigment dispersion of R254 and the pigment dispersion of R177, each photosensitive coloring composition was prepared by the following preparation method.
50 parts by weight of pigment dispersion, 6 parts by weight of acrylic resin (“ZAH-110” manufactured by Soken Chemical Co., Ltd.), 4 parts by weight of dipentaerythritol hexaacrylate as a polymerizable monomer, 2-methyl-1-as a photopolymerization initiator 1 part by weight of (4-methylthiophenyl) -2-morpholinopropan-1-one (“IRGACURE 907” manufactured by BASF) and 100 parts by weight of PGMEA as a solvent were stirred and mixed uniformly, and then a 1.0 μm filter. To obtain a photosensitive coloring composition.

Preparation of cured film About the cured film, it produced about the following 2 types.
Using a photosensitive coloring composition of R254, a cured film having a chromaticity adjusted so as to have a chromaticity x = 0.6500 during the post-baking process is prepared, and evaluation is performed on coarse particles, contrast, film thickness, and heat resistance. went.
Using a photosensitive coloring composition of R254 and R177, a cured film having a chromaticity adjusted so that chromaticity x = 0.6500 and y = 0.3230 during the post-baking process was prepared, and luminance was evaluated. It was.

1. Pre-baking process After apply | coating the photosensitive coloring composition obtained above on the glass substrate with a spin coater, it dried at 80 degreeC and 3 minutes, and obtained the coating film. A photomask was placed on the obtained coating film, and ultraviolet rays of 100 mJ / cm ² were irradiated using an ultraviolet fiber spot irradiation device. Further, it was vibrated in an alkaline aqueous solution (0.04 wt% potassium hydroxide aqueous solution) and then rinsed with pure water to remove uncured portions. The spin coater rotation speed was changed so as to sandwich the designated chromaticity, and three coating films were prepared so that the evaluation item for the designated chromaticity could be calculated by the primary correlation method.

2. Post-baking process The coating film from which the uncured portion was removed was preheated in a dryer at 80 ° C. for 30 minutes, and then heat-treated at 230 ° C. for 30 minutes to obtain a cured film.

Example 8
A cured film was obtained in the same manner as in Example 7, except that the formulation of the pigment solution shown in Table 6, the formulation of the poor solvent shown in Table 7, and the pigment fine particle production conditions shown in Table 8 were changed.

Example 9
A cured film was obtained in the same manner as in Example 8 except that the formulation of the pigment solution shown in Table 6 and the pigment fine particle production conditions shown in Table 8 were changed.

Comparative Example 4
As a comparative example in which pigment micronization is not performed, R254 used as a pigment raw material in Examples 7 to 9 was prepared as a pigment dispersion by the same method as Example 7 without pigment micronization. A cured film was obtained in the same manner.

Comparative Example 5
A cured film was obtained in the same manner as in Example 9 except that the poor solvent formulation shown in Table 7 and the pigment fine particle production conditions shown in Table 8 were changed. In addition, since only tap water was used as a poor solvent, the poor solvent was not prepared using CLEARMIX.

Comparative Example 6
350 mL of the pigment solution prepared in Example 8 using a burette in 1.1 L of the poor solvent prepared in Example 8 that was stirred at 1700 rpm using Claremix was 35 mL / min. The pigment fine particle dispersion was obtained. In order to separate only the pigment fine particles from the pigment fine particle dispersion, the pigment fine particles are loosely aggregated, and the pigment fine particles are collected by filtration under reduced pressure (−0.1 MPaG) using a filter paper. The wet cake was washed and dried in the same manner as in Example 7. Thereafter, a pigment dispersion was prepared in the same manner as in Example 7, and thereafter a cured film was obtained in the same manner.

About the evaluation method, it carries out similarly to Examples 1-6 and Comparative Examples 1-3, and the result is shown in Table 9. The determination was also made in the same manner as in Examples 1 to 6 and Comparative Examples 1 to 3.

Examples 7 to 9 in which the crystallite size of the (1 1 1) plane is 140 を 満 た す or less and the crystallite size of the (1 5 -1) plane is 80 Å or less are the crystallite sizes of the (1 1 1) plane Compared with Comparative Examples 4 to 6 having a crystallite size exceeding 140 Å and a crystallite size of (15 -1) plane exceeding 80 Å, the contrast and the brightness were high. This is because the crystal grain size is controlled to be small, the area of the crystal grain boundary is reduced, and light scattering is reduced, so that the contrast and brightness of the obtained color filter are improved. In addition, it is considered that the primary particles are made up of small crystallites, whereby the primary particles become small, the color filter has a high transmittance, light scattering is kept low, and it contributes to the improvement of contrast and brightness.
Examples 7 to 9 in which the ratio of the crystallite size between the (1 1 1) plane and the (0 2 0) plane is in the range of 0.85 to 1.25 and the average primary particle diameter is 5 to 40 nm. Compared with Comparative Examples 4 to 6 having a ratio of crystallite sizes outside this range and an average primary particle diameter, the results were high in contrast and luminance. This means that the average primary particle size is small and the crystallite aspect ratio is small, making it easier to arrange the crystallites in the primary particles with little anisotropy, making the primary particles optically uniform, and contrast and brightness. I think that improved. In addition, primary particles composed of nearly spherical crystallites also have a small aspect ratio, making it difficult to orient in the cured film, and a decrease in the anisotropy of the cured film also contributed to the improvement in contrast and brightness. . Furthermore, since the aspect ratio of the primary particles is small, the specific surface area of the pigment fine particles formed from the primary particles is small, and the particle surface energy is small, so that aggregation of particles can be suppressed. The R254 pigment dispersion of the present invention can ensure dispersion stability despite being a fine pigment that may cause thickening or gelation with time.
Examples 7 to 9 in which the change rate of the interplanar spacing at 80 ° C. and 230 ° C. of the (0 2 0) plane of the crystal lattice is 3.0% or less are comparisons where the change rate of the interplanar spacing exceeds 3.0% Compared to Examples 5 and 6, the results showed higher heat resistance. From this, R254 having a small rate of change in interplanar spacing due to heating shown in the examples has a specific crystallite size or a specific crystallite size ratio, so that crystal grain boundaries in the crystal structure are suppressed to be small, It is considered that a stable crystal structure in which the children are densely gathered can reduce the decrease in contrast due to heating.
From the above, it can be seen that by controlling various physical properties of diketopyrrolopyrrole pigment fine particles, it is possible to obtain red pigment fine particles satisfying characteristics required for color filters such as contrast, brightness, and heat resistance at a high level. .

Claims (19)

The crystallite size in the plane direction corresponding to the maximum peak in the X-ray diffraction pattern among the eight planes (± 1 ± 1 ± 1) of the crystal lattice plane calculated by the X-ray diffraction pattern is 140 mm or less. Diketopyrrolopyrrole pigment fine particles containing 90% or more of a compound represented by the following general formula (I).
[In the above general formula (I), X ₁ and X ₂ may each independently have a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, —CF ₃ , or a substituent. A saturated or unsaturated alkyl group or an aryl group which may have a substituent is shown. ] The crystallite size in the plane direction corresponding to the maximum peak in the X-ray diffraction pattern among the eight planes (± 1 ± 1 ± 1) of the crystal lattice plane calculated by the X-ray diffraction pattern is 140 mm or less. Diketopyrrolopyrrole pigment fine particles containing a compound represented by the following general formula (I) having a crystallite size in the (1 5 -1) plane direction of 80 mm or less calculated by an X-ray diffraction pattern.
[In the above general formula (I), X ₁ and X ₂ may each independently have a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, —CF ₃ , or a substituent. A saturated or unsaturated alkyl group or an aryl group which may have a substituent is shown. ] Of the eight crystal lattice planes (± 1 ± 1 ± 1) calculated by the X-ray diffraction pattern, the crystallite size in the plane direction corresponding to the maximum peak in the X-ray diffraction pattern is calculated by the X-ray diffraction pattern. The crystallite size ratio calculated by dividing the crystal lattice plane by the crystallite size in the plane direction corresponding to the maximum peak at 2θ = 3 to 10 ° is 0.85 to 1.25, And the average primary particle diameter is 5-40 nm, The diketopyrrolopyrrole pigment fine particle containing the compound shown by the following general formula (I) characterized by the above-mentioned.
[In the above general formula (I), X ₁ and X ₂ may each independently have a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, —CF ₃ , or a substituent. A saturated or unsaturated alkyl group or an aryl group which may have a substituent is shown. ] The crystallite size of the crystal lattice plane corresponding to 2θ = 24.5 ° ± 0.3 ° calculated from the X-ray diffraction pattern is 140 mm or less, and contains 90% or more of the compound represented by the following general formula (I) Diketopyrrolopyrrole pigment fine particles.
[In the above general formula (I), X ₁ and X ₂ may each independently have a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, —CF ₃ , or a substituent. A saturated or unsaturated alkyl group or an aryl group which may have a substituent is shown. ] The crystallite size of the crystal lattice plane corresponding to 2θ = 24.5 ° ± 0.3 ° calculated by the X-ray diffraction pattern is 140Å or less, and 2θ = 28.0 ° ± calculated by the X-ray diffraction pattern A diketopyrrolopyrrole pigment fine particle containing 90% or more of a compound represented by the following general formula (I), wherein a crystallite size of a crystal lattice plane corresponding to 0.3 ° is 80 mm or less.
[In the above general formula (I), X ₁ and X ₂ may each independently have a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, —CF ₃ , or a substituent. A saturated or unsaturated alkyl group or an aryl group which may have a substituent is shown. ] The diketopyrrolopyrrole pigment fine particles according to claim 1, 2, 4, or 5, having an average primary particle diameter of 5 to 40 nm. The crystallite size of the crystal lattice plane corresponding to 2θ = 24.5 ° ± 0.3 ° calculated by the X-ray diffraction pattern is 2θ = 7.4 ° ± 0.3 ° calculated by the X-ray diffraction pattern. The ratio of the crystallite size calculated by dividing by the crystallite size of the crystal lattice plane corresponding to is 0.85 to 1.25, and the average primary particle diameter is 5 to 40 nm, Diketopyrrolopyrrole pigment fine particles containing a compound represented by the following general formula (I).
[In the above general formula (I), X ₁ and X ₂ may each independently have a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, —CF ₃ , or a substituent. A saturated or unsaturated alkyl group or an aryl group which may have a substituent is shown. ] The rate of change between the value at 80 ° C. and the value at 230 ° C. of the crystal lattice plane corresponding to the maximum peak at 2θ = 3 to 10 ° calculated from the X-ray diffraction pattern is 3.0 (according to the following specific formula). The diketopyrrolopyrrole pigment fine particles according to claim 1, wherein the fine particles are diketopyrrolopyrrole pigments.
The rate of change between the value at 80 ° C. and the value at 230 ° C. =
{(Planar spacing at 230 ° C.) / (Planar spacing at 80 ° C.) × 100} −100 (%) [specific formula] The rate of change between the value at 80 ° C. and the value at 230 ° C. of the crystal lattice plane corresponding to 2θ = 7.4 ° ± 0.3 ° calculated from the X-ray diffraction pattern is 3 (according to the following specific formula). The diketopyrrolopyrrole pigment fine particles according to any one of claims 1 to 7, which are 0.0% or less.
The rate of change between the value at 80 ° C. and the value at 230 ° C. =
{(Planar spacing at 230 ° C.) / (Planar spacing at 80 ° C.) × 100} −100 (%) [specific formula] The diketopyrrolopyrrole pigment fine particles according to any one of claims 1 to 9, wherein the standard deviation of the primary particle diameter is less than 7.0. The diketopyrrolopyrrole pigment fine particles according to any one of claims 1 to 10, wherein the coefficient of variation (CV value) of the primary particle diameter is less than 30. The diketopyrrolopyrrole pigment fine particles according to any one of claims 1 to 11, wherein the Fe content is 35 ppm or less. The diketopyrrolopyrrole pigment fine particles according to any one of claims 1 to 12, wherein the general formula (I) is represented by the following general formula (II).
[In the general formula (II), each R independently represents a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, —CF ₃ , or a saturated or unsaturated group that may have a substituent. Or an aryl group which may have a substituent. ] The diketopyrrolopyrrole pigment fine particles according to claim 13, which are represented by the following formula (III), wherein R is bromine.
The crystallite size in the plane direction corresponding to the maximum peak in the X-ray diffraction pattern among the eight planes (± 1 ± 1 ± 1) of the crystal lattice plane calculated by the X-ray diffraction pattern is 140 mm or less. Diketopyrrolopyrrole pigment fine particles containing a compound represented by the following formula (III).
A pigment dispersion containing at least an organic pigment and an organic solvent, wherein the organic pigment is the diketopyrrolopyrrole pigment fine particles according to any one of claims 1 to 15. . A photosensitive coloring composition containing at least the pigment fine particles according to claim 1. A color filter comprising at least the photosensitive coloring composition according to claim 17. A color filter containing at least the pigment fine particles according to claim 1.