KR20190045183A - Pigment compositions and color filters for color filters - Google Patents

Abstract

A pigment composition for a novel color filter capable of producing a high-luminance color filter and a color filter containing the pigment composition for a color filter are provided. The pigment composition for a color filter has a transmittance of at least 55% at a wavelength of 555 nm and a transmittance at a wavelength of 505 nm and a transmittance at a wavelength of 555 nm (T ( 505 nm) / T (555 nm) of 1.40 or more and a half width of 80 nm or less. The color filter contains the pigment composition for the color filter.

Description

Pigment compositions and color filters for color filters

The present invention relates to a pigment composition and a color filter for a color filter.

A color filter used in a liquid crystal display is a member that realizes color display of a display by transmitting white light of a backlight. There is a demand for higher luminance and higher color reproduction of the green colorant for the color filter.

In order to achieve high brightness, it is important to select a pigment having a high transmittance to backlight, and Pigment Green 58 is used as a main pigment. By increasing the brightness of the pigment, the white light of the backlight can be efficiently used, so that energy saving and manufacturing cost reduction of the display can be achieved. Since the current display is designed in sRGB, the green pixel is designed to have a high luminance at (x, y) = (0.300, 0.600). Currently, as a backlight LED, the cost merit is small in a three-color LED. Therefore, a pseudo white LED (a combination of a blue LED and a yellow phosphor (B-YAG), a combination of a blue LED, a red phosphor and a green phosphor (B-RG)) formed by applying a phosphor on the surface of a blue LED, Are becoming mainstream. When such a white LED backlight is used, the green light emission intensity is weak compared to the blue light emission intensity, and the transmittance of the green coloration layer is reduced. Therefore, a higher luminance of the green coloring layer is required.

In addition, in order to achieve high color reproduction, a pigment capable of displaying a clear color in addition to a high luminance is selected. In order to achieve a clear color display, it is necessary to increase the film thickness of the color filter, but in order to sufficiently cure the film in the exposure process, the film thickness must be suppressed to about 3 탆 or less. The color reproduction display, which is expected to become popular in the future, will be designed with the DCI-P3. However, when Pigment Green 36 or 58 is used, the film thickness exceeds 3 mu m so that Pigment Green 7 is selected as the main pigment. For example, it has been proposed to form a green pixel using a green photosensitive resin composition containing Pigment Green 7 and Pigment Yellow 185 to achieve high color reproduction with a thin film of 2.2 탆 or less. However, Pigment Green 7 has a lower transmittance than Pigment Green 36 and 58. Therefore, there has been a problem that the brightness of the resulting display is lowered.

With respect to luminance, it is possible to compensate for the increase in the amount of backlight, but a new problem such as an increase in the amount of power consumption is caused. Therefore, both brightness and color reproducibility are required. Pigment Green 59 is used as a new high color reproduction pigment and, compared with the case of producing a color filter having the same film thickness, using Pigment Green 59 is more brilliant than using Pigment Green 7 (see, for example, Patent See Document 1).

From the above, it is recognized that Pigment Green 58 is used for the color filter for the high luminance display and Pigment Green 59 is used for the color filter for the high color reproduction display.

The major difference between a color filter for a high luminance display and a color filter for a high color reproduction display is the type of chromaticity and back light for designing a green pixel.

In the current color filter for high luminance display, the chromaticity is sRGB (x, y) = (0.300, 0.600), and the backlight is B-YAG mainstream. However, since the B-YAG differs depending on the manufacturer, the color filter is evaluated with (x, y) = (0.275, 0.570) using the C light source (see, for example, Patent Document 2).

What is to be expected as a color filter for a high color reproduction display is chromaticity DCI-P3 and backlight B-RG. However, since the B-RG differs depending on the manufacturer, the color filter is evaluated with (x, y) = (0.250, 0.615) using the C light source (see, for example, Patent Document 3).

Japanese Patent Application Laid-Open No. 2016-057635 Japanese Patent Application Laid-Open No. 2014-085562 Japanese Patent Application Laid-Open No. 11-191986

As described above, it is recognized that it is preferable to use Pigment Green 58 for the color filter for high luminance display. However, in order to supplement the characteristics of B-YAG which is a backlight having a weak green light emission intensity, it has been further desired to increase the brightness of the green pigment.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances and provides a pigment composition for a novel color filter capable of producing a high-luminance color filter and a color filter containing the pigment composition for a color filter.

As a result of intensive studies to solve the above problems, the present inventors have found that a color filter having higher luminance than that of the prior art can be formed by using a pigment composition for a color filter having specific spectroscopic characteristics, thereby completing the present invention .

That is, the present invention includes the following aspects.

The pigment composition for a color filter according to the first aspect of the present invention is characterized in that when a coating film is formed so that the spectral transmittance at the maximum transmittance wavelength is 80%, the transmittance at a wavelength of 555 nm is at least 45%, the transmittance at a wavelength of 505 nm, (505 nm) / T (555 nm)) of 555 nm is 1.40 or more and a half width is 80 nm or less.

The green pigment may be chlorinated zinc phthalocyanine bromide.

The green pigment may be zinc chlorotrifluoride zinc bromide which contains bromine in an average of 13 to 15 on average and chlorine in an average of 1 to 3 on average. The pigment composition for a color filter according to the first aspect may further contain a yellow pigment.

The color filter according to the second aspect of the present invention contains the pigment composition for a color filter according to the first aspect.

According to the pigment composition for a color filter of the above embodiment, a high-luminance color filter can be produced.

1A is a diagram showing the spectral transmittance spectra (wavelengths: 480 to 580 nm) of Evaluation Compositions 1 to 7 and 9 to 12 in Example 1 and Comparative Example 1. FIG.
Fig. 1B is a view showing the spectral transmittance spectra (wavelengths of 440 to 480 nm) of Evaluation Compositions 1 to 7 and 9 to 12 in Example 1 and Comparative Example 1. Fig.
1C is a diagram showing the spectral transmittance spectra (wavelengths: 580 to 620 nm) of the compositions for evaluation 1 to 7, 9, 10 and 12 in Example 1 and Comparative Example 1. FIG.

&Quot; Pigment composition for color filter "

In one embodiment, the present invention provides a color filter comprising a green pigment having the following spectral characteristics (a) to (c) when a coating film is formed so as to have a spectral transmittance at a maximum transmittance wavelength of 80% / RTI >

(a) the transmittance at a wavelength of 555 nm is 45% or more

(b) the ratio of the transmittance at a wavelength of 505 nm to the transmittance at a wavelength of 555 nm (T (505 nm) / T (555 nm)) is 1.40 or more

(c) the full width at half maximum is 80 nm or less

According to the pigment composition for a color filter of the present embodiment, it is possible to provide a high-luminance color filter capable of supplementing the characteristics of LED-YAG which is a backlight having a small amount of green light.

The spectral transmittance in the present specification can be obtained by measuring the spectral transmittance spectrum.

The "spectral transmittance spectrum" is obtained in accordance with the Japanese Industrial Standards JIS Z 8722 (Method for measuring color - reflection and transmitted object color) according to the first type spectrometer. Specifically, light having a predetermined wavelength region is scanned and irradiated onto a resin film containing a pigment formed into a predetermined dry film thickness on a glass substrate or the like, and the transmittance values at respective wavelengths are plotted.

<Construction materials>

[Green Pigment]

The green pigment contained in the pigment composition for a color filter of the present embodiment has the following spectral characteristics (a) to (c) when a coating film is formed such that the spectral transmittance at the maximum transmittance wavelength is 80%.

(a) the transmittance at a wavelength of 555 nm is 45% or more

(b) the ratio of the transmittance at a wavelength of 505 nm to the transmittance at a wavelength of 555 nm (T (505 nm) / T (555 nm)) is 1.40 or more

(c) the full width at half maximum is 80 nm or less

In the green color filter, it is important to increase the transmittance in the range of 510 nm or more and 560 nm or less in ensuring the brightness. When coloring with a yellow pigment is carried out, the yellow pigment is shifted toward the longer wavelength side by about 5 nm by blending of the yellow pigment. Therefore, it is important to increase the transmission wavelength at 505 nm while maintaining a high transmittance at 555 nm in order to obtain a bright display.

On the other hand, when the transmittance at 460 nm is high, the value of the chromaticity y greatly lowers and the clarity (greenness) of the green color is lost, so that the transmittance at 460 nm after coloring by the yellow pigment is preferably low. For example, the yellow pigment Y138 is a pigment that absorbs a shorter wavelength side than 460 nm. If the transmittance of the green pigment at 460 nm is high, a design for increasing the amount of Y138 to be used is required. Thus, in order to display (x, y) = (0.275, 0.570), the color filter can not be thickened. The thickening of the color filter is undesirable because it causes a decrease in luminance. That is, it is preferable that the green pigment has a low transmittance of 460 nm. It is preferable from the viewpoint of increasing the value of the chromaticity y that the transmittance of the green pigment at 460 nm is 3% or less when the coating film is formed so that the spectral transmittance at the maximum transmittance wavelength is 80%. More preferably 2% or less, and still more preferably 1% or less.

When the transmittance at 605 nm is high, the value of chromaticity x becomes large and the clarity of green is lost. Therefore, it is preferable that the transmittance at 605 nm after coloring by the yellow pigment is low. It is preferable that the green pigment has a low transmittance of 600 nm because it shifts to a long wavelength side of about 5 nm by coloring with a yellow pigment. When the coating film is formed so that the spectral transmittance at the maximum transmittance wavelength is 80%, it is preferable that the transmittance of 600 nm of the green pigment is 1% or less from the viewpoint of decreasing the value of chromaticity x. More preferably 0.5% or less, and still more preferably 0.3% or less.

That is, a green pigment having a large transmittance spectrum of T (505 nm) / T (555 nm) and a low transmittance at 460 nm and 600 nm is required for realizing excellent color reproducibility with high brightness.

The green pigment contained in the pigment composition for a color filter of the present embodiment has the spectral characteristics (a) to (c) described above when the coating film is formed so that the spectral transmittance at the maximum transmittance wavelength is 80% It is possible to obtain a color filter having a higher luminance than the conventional green pigment, as shown in the following embodiments. In addition, the green pigment contained in the pigment composition for a color filter of the present embodiment has a low transmittance at 460 nm and 600 nm when a coating film is formed so that the spectral transmittance at the maximum transmittance wavelength becomes 80%. Therefore, as shown in Examples described later, a color filter having color reproducibility superior to the conventional green pigment can be obtained.

The green pigment contained in the pigment composition for a color filter of the present embodiment has a maximum transmittance wavelength of not less than 515 nm and not more than 530 nm in the coating film when the coating film is formed such that the spectral transmittance at the maximum transmittance wavelength is 80% Is preferable.

The green pigment having the spectroscopic characteristics may be either an inorganic pigment or an organic pigment. Among them, the green pigment is preferably an organic pigment, more preferably a phthalocyanine compound, and more preferably a phthalocyanine compound having a metal atom at its center.

In the present specification, the "phthalocyanine compound" is a cyclic compound having a structure in which four phthalic acid imides are cross-linked by a nitrogen atom. The "phthalocyanine compound having a metal atom at the center" is a compound having a structure in which four nitrogen atoms at the center of the phthalocyanine compound are chemically bonded (for example, covalent bond, coordination bond, etc.) to a metal atom.

The metal atom present in the center of the phthalocyanine compound is not particularly limited and includes, for example, Zn, Mg, Al, Si, Ti, V, Mn, Fe, Co, Ni, Ge and Sn. Among them, the metal atom present at the center of the phthalocyanine compound is preferably Zn (zinc).

As the phthalocyanine compound having a metal atom at the center in the green pigment, zinc phthalocyanine is preferable, halogenated zinc phthalocyanine is more preferable, and zinc phthalocyanine bromide is more preferable.

When the green pigment is zinc chlorophthalocyanine bromide, it has an average of 14 or more and 16 or less halogen atoms, 13 or more and 15 or less bromine atoms in the molecule, and an average of 1 or more chlorine atoms Or less.

Further, since the color of the pigment becomes yellow only by increasing the halogenation rate, the number of bromine in one molecule of the zinc chlorotrifluoroanimate bromide is increased more than the number of chlorine, whereby a green pigment having high brightness is obtained while maintaining the color of green . Among them, in the green pigment of the present embodiment, it is preferable that the average number of bromine in one molecule of chlorinated zinc phthalocyanine bromide is at least 7 times, more preferably at least 7 times and at most 9 times, more preferably at least 7.8 times and 9 times Or less.

The number of halogen atoms in one molecule of the zinc chlorotrifluoride bromide can be measured by the method (fluorescence X-ray analysis) described in the following Examples.

(Production method of green pigment)

The halogenated metal phthalocyanine in the green pigment can be produced by a known production method such as a chlorosulfonic acid method, a halogenated phthalonitrile method, a melting method and the like.

Examples of the chlorosulfonic acid method include a method of dissolving a metal phthalocyanine in a solvent of a sulfur oxide type such as chlorosulfonic acid and introducing chlorine gas or bromine thereto to halogenate the metal phthalocyanine. The reaction at this time is carried out at a temperature of 20 ° C or higher and 120 ° C or lower, and in a range of 3 hours or longer and 20 hours or shorter.

As the halogenated phthalonitrile method, for example, phthalic acid or phthalonitrile in which a part or all of the hydrogen atoms of the aromatic ring are substituted with halogen atoms such as bromine or chlorine, and a metal or metal salt of zinc are suitably used as starting materials, And a method of synthesizing halogenated metal phthalocyanine. In this case, if necessary, a catalyst such as ammonium molybdate may be used. The reaction at this time is performed at a temperature of 100 ° C or higher and 300 ° C or lower, and in a range of 7 hours or longer and 35 hours or shorter.

Examples of the melting method include an alkali metal halide such as aluminum chloride, aluminum halide such as aluminum bromide, titanium halide such as titanium tetrachloride, alkali metal halide such as sodium chloride or sodium bromide, or alkaline earth metal halide (hereinafter referred to as &quot;Quot; metal halide &quot;), thionyl chloride, and the like, or a mixture of two or more of these compounds as a solvent at various halogenations, a metal phthalocyanine And halogenating with a halogenating agent.

The aluminum halide is preferably aluminum chloride. In the above melting method using aluminum halide, the amount of aluminum halide to be added is usually 3-fold molar or more, preferably 10-fold molar or more and 20-fold molar or less, with respect to zinc phthalocyanine.

Aluminum halide may be used alone, but when an alkali (earth) metal halide is used in combination with aluminum halide, the melting temperature can be further lowered, which is advantageous for operation. The alkali (earth) metal halide is preferably sodium chloride. The amount of the alkali (earth) metal halide to be added is preferably 5 parts by mass or more and 15 parts by mass or less with respect to 10 parts by mass of the aluminum halide within the range of forming a molten salt.

Examples of the halogenating agent include chlorine gas, chloroferrile, bromine and the like.

The halogenation temperature is preferably 10 ° C or more and 170 ° C or less, and more preferably 30 ° C or more and 140 ° C or less. Further, in order to accelerate the reaction speed, it may be pressurized. The reaction time is preferably from 5 hours to 100 hours, more preferably from 30 hours to 45 hours.

As the method for producing the halogenated metal phthalocyanine, a melting method using two or more kinds of compounds as a solvent at the time of halogenation is preferably used. As a reason for this, in this method, by controlling the ratio of chloride and bromide to iodide in the molten salt, or changing the amount of chlorine gas, bromine or iodine introduced or the reaction time, the specific halogen The content ratio of the zinc halide phthalocyanine of the atomic composition can be arbitrarily controlled.

The metal phthalocyanine to be a suitable raw material in the present embodiment is zinc phthalocyanine. Since the decomposition of the starting material in the reaction is small and the yield from the starting material is excellent and the reaction can be carried out at low cost without using strong acid, the melting method is suitable for obtaining the halogenated zinc phthalocyanine.

The halogenated zinc phthalocyanine having a halogen atom composition different from that of the conventional zinc halide phthalocyanine can be obtained by optimizing the raw material injection method, the type and amount of the catalyst, the reaction temperature and the reaction time.

After the completion of the reaction in any of the above production methods, when the obtained mixture is put into an acidic aqueous solution such as water or hydrochloric acid, the resulting metal halide phthalocyanine is precipitated. The halogenated metal phthalocyanine may be used as it is, followed by filtration or washing with water, sodium hydrogen sulfate, sodium hydrogen carbonate or sodium hydroxide and, if necessary, washing with acetone, toluene, methyl alcohol, ethyl alcohol, It is preferable to use an organic solvent after washing with an organic solvent such as dimethylformamide followed by post-treatment such as drying.

The halogenated metal phthalocyanine may be subjected to dry grinding in a pulverizer such as an attritor, a ball mill, a vibrating mill or a vibrating ball mill if necessary, and then pigmented by a solvent salt milling method or a solvent boiling method, A pigment which is excellent in dispersibility and tinting power and develops green color having high brightness can be obtained.

The method of pigmenting halogenated metal phthalocyanine is not particularly limited. For example, halogenated metal phthalocyanine before pigmentation may be dispersed in a dispersion medium and pigmented. Among them, as a method of pigmenting a halogenated metal phthalocyanine, from the viewpoint that the crystal growth can be suppressed more easily than a solvent treatment in which a halogenated metal phthalocyanine is heated and stirred in a large amount of an organic solvent and pigment particles having a large specific surface area can be obtained, It is preferable to employ a solvent salt milling treatment.

This means that the solvent salt milling is a step of kneading and grinding a crude pigment which is a non-pigmented halogenated metal phthalocyanine, which has undergone grinding immediately after or after synthesis, an inorganic salt, and an organic solvent. In this case, it is preferable to use the latter crude pigment. Concretely, a crude pigment, an inorganic salt and an organic solvent which does not dissolve the crude pigment are fed into a kneader, and kneading is carried out in the kneader. As the kneading machine at this time, for example, a kneader or a mixmiller may be used.

As the inorganic salt, a water-soluble inorganic salt can be suitably used. For example, inorganic salts such as sodium chloride, potassium chloride and sodium sulfate are preferably used. It is more preferable to use an inorganic salt having an average particle diameter of 0.5 μm or more and 50 μm or less. Such an inorganic salt can be easily obtained by pulverizing a conventional inorganic salt.

In the present embodiment, a halogenated metal phthalocyanine pigment having an average primary particle diameter of 50 nm or less is preferably used for a color filter. In order to obtain the above-mentioned preferable halogenated metal phthalocyanine in the present embodiment, it is preferable to increase the amount of the inorganic salt used relative to the amount of the crude pigment used in the solvent salt milling. That is, the amount of the inorganic salt to be used is preferably 5 parts by mass or more and 20 parts by mass or less, and more preferably 7 parts by mass or more and 15 parts by mass or less, based on 1 part by mass of the crude pigment.

As the organic solvent, it is preferable to use an organic solvent capable of suppressing crystal growth. As such an organic solvent, a water-soluble organic solvent can be suitably used. Specific examples of the water-soluble organic solvent include diethylene glycol, glycerin, ethylene glycol, propylene glycol, liquid polyethylene glycol, liquid polypropylene glycol, 2- (methoxymethoxy) ethanol, 2-butoxyethanol, Diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol, triethylene glycol monomethyl ether, 1, 2-hexanediol, 2-ethylhexyl alcohol, -Methoxy-2-propanol, 1-ethoxy-2-propanol, dipropylene glycol, dipropylene glycol monomethyl ether and the like. The amount of the water-soluble organic solvent to be used is not particularly limited, and is preferably 0.01 parts by mass or more and 5 parts by mass or less based on 1 part by mass of the crude pigment.

The temperature at the time of solvent salt milling is preferably 30 ° C or more and 150 ° C or less, and more preferably 80 ° C or more and 100 ° C or less. The time of the solvent salt milling is preferably from 5 hours to 20 hours, more preferably from 8 hours to 18 hours.

Thus, a mixture containing a halogenated metal phthalocyanine pigment having an average primary particle diameter of 50 nm or less, an inorganic salt, and an organic solvent as main components can be obtained. The organic solvent and the inorganic salt are removed from the mixture, and if necessary, the solid material mainly containing the halogenated metal phthalocyanine pigment is washed, filtered, dried and pulverized to obtain a powder of the halogenated metal phthalocyanine pigment.

As the washing, washing with water or bathing can be employed. The number of times of cleaning may be repeated in a range of one time to five times or less. In the case of the above mixture using the water-soluble inorganic salt and the water-soluble organic solvent, the organic solvent and the inorganic salt can be easily removed by washing with water. If necessary, acid washing, alkali washing and organic solvent washing may be performed so as not to change the crystal state.

Examples of the above-mentioned filtration and drying after the cleaning include a batch-type or continuous-type drying method in which at least one of dehydration or de-solvent of the pigment is carried out by heating at 80 ° C or more and 120 ° C or less by a heating source provided in a drier Drying and the like. Examples of the dryer include a box-type dryer, a band dryer, a spray dryer and the like. Particularly, spray dry drying is preferable because it is dispersed at the time of making the paste. The pulverization after drying is not an operation for increasing the specific surface area or for decreasing the average particle diameter of the primary particles. The pulverization after drying is carried out, for example, in the case of drying with a box type drier or a band drier, to release the pigment and pulverize the pigment when the pigment becomes a lamp type or the like. As the pulverizer used after drying, for example, induction, hammer mill, disk mill, pin mill, jet mill and the like can be given. Thus, a dry powder of a pigment containing a halogenated metal phthalocyanine pigment as a main component can be obtained.

The green pigment may contain one compound or two or more compounds from which coloration is to be derived. When two or more compounds are included, the respective compounds contained in the green pigment may be pigmented after mixing, or the respective compounds contained in the green pigment may be pigmented and then mixed.

[Yellow Pigment]

In order to form a green pixel, the pigment composition for a color filter of the present embodiment may contain at least one yellow pigment together with the green pigment.

Examples of the yellow pigments include CI Pigment Yellow (PY) 1,2,3,4,5,6,10,12,13,14,15,16,17,18,24,31,32,34 , 35, 35: 1,36, 36: 1,37, 37: 1, 40, 42, 43, 53, 55, 60, 61, 62, 63, 65, 73, 74, 77, 81, 83, 93 , 94, 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 115, 116, 117, 118, 119, 120, 126, 127, 128, 129, 138, 139 , 150, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 179, 180, 181 , 182, 185, 187, 199, 231, and the like. Of these pigments, PY83, 138, 139, 150, 185, or 231 is preferable, and PY138, 150, 185, or 231 is particularly preferable as the yellow pigment in view of high brightness or a small amount of pigment, desirable. These may be used alone or in combination of two or more.

In the case of preparing a pigment composition for a color filter by mixing a yellow pigment, the mixing ratio of the green pigment and the yellow pigment may be 1 part by mass or more and 400 parts by mass or less per 100 parts by mass of the green pigment.

In addition, in the pigment composition for a color filter of the present embodiment, a color filter green pixel portion of high luminance can be produced, compared with the case of using a conventional green pigment, even when yellow pigment is used together for coloring.

&Lt; Process for producing pigment composition for color filter &

The pigment composition for a color filter of the present embodiment can be produced by a known production method.

The production method of the green pigment is as described above.

More specifically, the green pigment and, if necessary, the yellow pigment are dry-polished in a pulverizer such as an atrito, a ball mill, a vibrating mill, a vibrating ball mill and the like, and then the pigment is dried by a solvent salt milling method or a solvent- It can be changed.

The details of the pigmentation are the same as described in the aforementioned (green pigment production method).

The pigment composition for a color filter of the present embodiment has a primary particle having an average particle diameter of 50 nm or less, preferably 1 nm or more and 50 nm or less, and a pigment aggregation is comparatively weak, so that the dispersion property to a synthetic resin or the like Do. Further, it is more preferable that it is not less than 1 nm and not more than 20 nm.

In the present embodiment, the &quot; average particle diameter of primary particles &quot; can be calculated using the following measurement method. First, particles of the pigment composition for color filter of this embodiment in the field of view are photographed with a transmission electron microscope JEM-2010 (manufactured by Japan Electronics Co., Ltd.). Next, the diameter (long diameter) on the long side of each of the primary particles of the pigment composition for a color filter of the present embodiment constituting the agglomerate on the two-dimensional image is obtained. Next, by averaging the obtained long diameters, the average particle diameter of the primary particles can be calculated. At this time, the pigment composition for a color filter of this embodiment, which is a sample, is subjected to ultrasonic dispersion in a solvent and then photographed by a microscope. In addition, a scanning electron microscope may be used instead of the transmission electron microscope.

<Applications>

By forming a green pixel using the pigment composition for a color filter of the present embodiment, a color filter can be obtained.

The green pixel formed using the pigment composition for a color filter of this embodiment has a high luminance. Therefore, it is possible to manufacture a liquid crystal display device including the color filter and the liquid crystal panel having high display performance with such green pixels.

(Manufacturing Method of Color Filter)

The pigment composition for a color filter of the present embodiment can be used for forming a pattern of a green pixel portion of a color filter by a known method. Typically, a photosensitive composition for a color filter green pixel portion containing the pigment composition for a color filter of the present embodiment and a photosensitive resin as an essential component can be obtained.

As a manufacturing method of the color filter, for example, a method referred to as photolithography shown below can be given. Specifically, first, the pigment composition for a color filter of the present embodiment is dispersed in a dispersion medium made of a photosensitive resin. Next, this dispersion is applied on a transparent substrate such as glass by a spin coating method, a roll coating method, a slit coating method, an ink jet method, or the like to obtain a coated film. Next, the coated film is exposed to ultraviolet rays through a photomask. Next, the unexposed portion is washed with a solvent or the like to obtain a green pattern.

Examples of other manufacturing methods include a method of forming a pattern of a green pixel portion by a method such as an electrodeposition method, a transfer method, a micelle electrolysis method, or a PVED (Photovoltaic Electrodeposition) method to produce a color filter. The pattern of the red pixel portion and the pattern of the blue pixel portion can be formed by the same method using a known pigment.

To prepare a photosensitive composition for a color filter green pixel portion, for example, a pigment composition for a color filter, a photosensitive resin, a photopolymerization initiator, and an organic solvent for dissolving the resin are mixed as essential components. More specifically, a method is generally used in which a dispersion liquid is prepared by using the pigment composition for a color filter, an organic solvent and, if necessary, a dispersant, and then a photosensitive resin or the like is added thereto.

Examples of the dispersing agent include DISPERBYK 130, Copper 161, Copper 162, Copper 163, Copper 170, Copper LPN-6919 and Copper LPN-21116 available from Big Chemie. A leveling agent, a coupling agent, a cationic surfactant, and the like may also be used.

Examples of the organic solvent include aromatic solvents such as toluene, xylene and methoxybenzene; acetic acid ester solvents such as ethyl acetate and butyl acetate, propylene glycol monomethyl ether acetate and propylene glycol monoethyl ether acetate; ethoxyethyl Propionate solvents such as propionate, etc .; alcohol solvents such as methanol and ethanol; ether solvents such as butyl cellosolve, propylene glycol monomethyl ether, diethylene glycol ethyl ether and diethylene glycol dimethyl ether; Ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone; aliphatic hydrocarbon solvents such as hexane; aliphatic hydrocarbon solvents such as N, N-dimethylformamide, gamma -butyrolactam, A nitrogen compound solvent such as pyridine, a lactone solvent such as? -Butyrolactone, a 48:52 mixture of methyl carbamate and ethyl carbamic acid And the like, such as carboxylic acid ester, water. As the organic solvent, polar solvents such as propionate type, alcohol type, ether type, ketone type, nitrogen compound type, lactone type, and water are preferably water soluble. A high boiling point solvent having a boiling point of 150 ° C or higher can also be suitably used.

An organic solvent in an amount of not less than 300 parts by mass and not more than 1000 parts by mass and 100 parts by mass or less of a dispersing agent in an amount of 0 part by mass or more and 100 parts by mass or less per 100 parts by mass of the pigment composition for a color filter of the present embodiment is stirred and dispersed to obtain a dispersion . Next, to this dispersion, a photosensitive resin in an amount of 3 parts by mass or more and 20 parts by mass or less per 100 parts by mass of the pigment composition for a color filter of the present embodiment, 0.05 parts by mass or more and 3 parts by mass or less of a photopolymerization initiator per 1 part by mass of the photosensitive resin, , An organic solvent is further added, and the mixture is stirred and dispersed so as to be uniform so that a photosensitive composition for a color filter green pixel portion can be obtained.

Examples of the photosensitive resin include thermoplastic resins such as urethane resin, acrylic resin, polyamide acid resin, polyimide resin, styrene maleic acid resin, styrene maleic anhydride resin and the like, and thermosetting resins such as 1,6-hexanediol di Bifunctional monomers such as acrylate, ethylene glycol diacrylate, neopentyl glycol diacrylate, triethylene glycol diacrylate, bis (acryloxyethoxy) bisphenol A and 3-methylpentanediol diacrylate, trimethylolpropane And polyfunctional monomers such as triacrylate, pentaerythritol triacrylate, tris (2-hydroxyethyl) isocyanate, dipentaerythritol hexaacrylate, dipentaerythritol pentaacrylate, etc. .

Examples of the photopolymerization initiator include acetophenone, benzophenone, benzyldimethyl ketal, benzoyl peroxide, 2-chlorothioxanthone, 1,3-bis (4'-azidobenzal) -Bis (4'-azidobenzal) -2-propane-2'-sulfonic acid, 4,4'-diazidostilbene-2,2'-disulfonic acid and the like.

The prepared photosensitive composition for a color filter green pixel part can be subjected to pattern exposure with ultraviolet rays through a photomask and then washed with an organic solvent or alkaline water to obtain a color filter.

[Example]

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples and the like.

[Production Example 1] (Pigment 1)

45 parts chlorinated sulfuryl, 109 parts aluminum chloride, 15 parts sodium chloride, 30 parts zinc phthalocyanine, and 300 parts bromine were injected into a 300 mL flask. The temperature was raised to 145 캜 over 40 hours, and the mixture was taken out into water and filtered to obtain Coarse Pigment 1. 20 parts of the obtained crude pigment 1, 140 parts of pulverized sodium chloride, 32 parts of diethylene glycol, and 1.8 parts of xylene were charged into a 1 L pair complete kneader and kneaded at 30 캜 for 15 hours. After kneading, the mixture was taken out into 2 kg of water at 30 캜, stirred for 1 hour, filtered, washed, dried and pulverized to obtain Pigment 1.

The average number of chlorine atoms and the average number of bromine atoms of the obtained pigment 1 were calculated by performing fluorescent X-ray analysis using ZSX100E manufactured by Rigaku Corporation and calculating the relative value per one zinc atom from the mass ratio of zinc atom, chlorine atom and bromine atom did. Further, 1 g of zinc phthalocyanine halide was subjected to pressure molding (25 mm?) As a measurement sample under the measurement of a diameter of 20 mm? In a vacuum atmosphere. As a result, in the pigment 1, a halogenated zinc phthalocyanine pigment having an average number of halogen atoms in one molecule of 15.73, an average of bromine atoms of 14.13, and an average chlorine atom number of 1.60. The obtained pigment 1 had an average particle diameter of primary particles of 0.02 占 퐉 as measured by a particle diameter measurement by a transmission electron microscope JEM-2010 manufactured by JEOL Ltd.

2.48 parts of the obtained pigment 1 was dispersed in a paint shaker for 2 hours using zircon beads of 0.3 to 0.4 mm together with 1.24 parts of BYK-LPN 6919, 1.86 parts of Unidic ZL-295 and 10.92 parts of propylene glycol monomethyl ether acetate, Composition 1 was obtained. 4.0 parts of Coloring Composition 1, 0.98 parts of Unidic ZL-295 and 0.22 parts of propylene glycol monomethyl ether acetate were added and mixed with a paint shaker to obtain Evaluation Composition 1 for forming a green pixel portion for a color filter. The composition for evaluation 1 was spin-coated on soda glass and dried at 90 占 폚 for 3 minutes to obtain a glass substrate for evaluation. The monochromatic spectral transmittance spectrum of the glass substrate for evaluation was measured using U-3900 manufactured by Hitachi High Technologies. The spectral transmittance spectra are shown in Figs. 1A, 1B and 1C.

[Production Example 2] (Pigment 2-2: Pigment 1 + Pigment 2-1)

91 parts of chlorinated sulfuryl, 109 parts of aluminum chloride, 15 parts of sodium chloride, 30 parts of zinc phthalocyanine and 41 parts of bromine were injected into a 300 mL flask. The temperature was raised to 130 deg. C over 40 hours, and the mixture was taken out in water and filtered to obtain Coarse Pigment 2. 20 parts of the obtained crude pigment 2, 140 parts of pulverized sodium chloride, 32 parts of diethylene glycol, and 1.8 parts of xylene were fed into a 1 L pair complete kneader and kneaded at 100 캜 for 6 hours. After kneading, the mixture was taken out into 2 kg of water at 80 캜, stirred for 1 hour, filtered, washed, dried and pulverized to obtain Pigment 2-1. The obtained pigment 2-1 was subjected to fluorescent X-ray analysis in the same manner as in Production Example 1. As a result, in the pigment 2-1, it was a zinc halide phthalocyanine pigment having an average number of halogen atoms per molecule of 11.15, an average of bromine atoms of 8.63, and an average chlorine atom number of 2.52.

Next, 0.12 part of the obtained pigment 2-1 and 1.86 part of the pigment 1 were mixed well to obtain a pigment 2-2. The obtained pigment 2-2 was subjected to fluorescent X-ray analysis in the same manner as in Production Example 1. As a result, in pigment 2-2, it was a halogenated zinc phthalocyanine pigment having an average number of halogen atoms of 15.30 in one molecule, an average of 13.59 of bromine atoms and an average chlorine atom number of 1.71. The obtained pigment 2-2 had an average particle diameter of primary particles of 0.02 占 퐉 as measured by a particle diameter measurement by a transmission electron microscope JEM-2010 manufactured by JEOL Ltd.

2.48 parts of the obtained pigment 2-2 was dispersed in a paint shaker for 2 hours using zircon beads of 0.3 to 0.4 mm together with 1.24 parts of BYK-LPN 6919, 1.86 parts of Unidic ZL-295 and 10.92 parts of propylene glycol monomethyl ether acetate To obtain Coloring Composition 2. 4.0 parts of Coloring Composition 2, 0.98 parts of Unidic ZL-295 and 0.22 parts of propylene glycol monomethyl ether acetate were added and mixed with a paint shaker to obtain Evaluation Composition 2 for forming a green pixel portion for a color filter. The composition for evaluation 2 was spin-coated on soda glass and dried at 90 占 폚 for 3 minutes to obtain a glass substrate for evaluation. The monochromatic spectral transmittance spectrum of the glass substrate for evaluation was measured using U-3900 manufactured by Hitachi High Technologies. The spectral transmittance spectra are shown in Figs. 1A, 1B and 1C.

[Production Example 3] (Pigment 3)

60 parts of chlorfurfuryl, 109 parts of aluminum chloride, 15 parts of sodium chloride, 30 parts of zinc phthalocyanine and 230 parts of bromine were injected into a 300 mL flask. The temperature was raised to 145 캜 over 40 hours, and the mixture was taken out into water and filtered to obtain Coarse Pigment 3. 20 parts of the obtained crude pigment 3, 140 parts of pulverized sodium chloride, 32 parts of diethylene glycol, and 1.8 parts of xylene were fed into a 1 L pair complete kneader and kneaded at 30 캜 for 15 hours. After kneading, the mixture was taken out to 2 kg of water at 30 캜, stirred for 1 hour, filtered, washed, dried and pulverized to obtain Pigment 3. The obtained pigment 3 was subjected to fluorescent X-ray analysis in the same manner as in Production Example 1. As a result, in Pigment 3, the average number of halogen atoms in one molecule was 15.10, among which brominated zinc phthalocyanine pigments had an average of 13.36 bromine atoms and an average chlorine atom number of 1.74. The obtained pigment 3 had an average particle diameter of primary particles of 0.02 mu m as measured by a particle diameter measurement by a transmission electron microscope JEM-2010 manufactured by JEOL Ltd.

2.48 parts of the obtained pigment 3 was dispersed in a paint shaker for 2 hours using zircon beads of 0.3 to 0.4 mm together with 1.24 parts of BYK-LPN 6919, 1.86 parts of Unidic ZL-295 and 10.92 parts of propylene glycol monomethyl ether acetate, Composition 3 was obtained. 4.0 parts of Coloring Composition 3, 0.98 parts of Unidic ZL-295 and 0.22 parts of propylene glycol monomethyl ether acetate were added and mixed with a paint shaker to obtain Evaluation Composition 3 for forming a green pixel portion for a color filter. The composition for evaluation 3 was spin-coated on soda glass and dried at 90 캜 for 3 minutes to obtain a glass substrate for evaluation. The monochromatic spectral transmittance spectrum of the glass substrate for evaluation was measured using U-3900 manufactured by Hitachi High Technologies. The spectral transmittance spectra are shown in Figs. 1A, 1B and 1C.

[Production Example 4] (Pigment 4)

20 parts of crude pigment 1 of Production Example 1, 1.5 parts of TS-1316 manufactured by Seiko PMC, 140 parts of pulverized sodium chloride, 32 parts of diethylene glycol, and 1.8 parts of xylene were charged into a 1 L pair complete kneader and kneaded at 30 캜 for 15 hours. After kneading, the mixture was taken out into 2 kg of water at 30 캜, stirred for 1 hour, filtered, washed, dried and pulverized to obtain pigment 4. The obtained pigment 4 had an average particle diameter of primary particles of 0.02 占 퐉 as measured by a particle diameter measurement by a transmission electron microscope JEM-2010 manufactured by JEOL Ltd.

2.48 parts of the obtained pigment 4 was dispersed in a paint shaker for 2 hours using zircon beads of 0.3 to 0.4 mm together with 1.24 parts of BYK-LPN 6919, 1.86 parts of Unidic ZL-295 and 10.92 parts of propylene glycol monomethyl ether acetate, Composition 4 was obtained. 4.0 parts of Coloring Composition 4, 0.98 parts of Unidic ZL-295 and 0.22 parts of propylene glycol monomethyl ether acetate were added and mixed with a paint shaker to obtain Evaluation Composition 4 for forming a green pixel portion for a color filter. The composition for evaluation 4 was spin-coated on soda glass and dried at 90 占 폚 for 3 minutes to obtain a glass substrate for evaluation. The monochromatic spectral transmittance spectrum of the glass substrate for evaluation was measured using U-3900 manufactured by Hitachi High Technologies. The spectral transmittance spectra are shown in Figs. 1A, 1B and 1C.

[Production Example 5] (Pigment 5)

20 parts of crude pigment 1 of Production Example 1, 1.5 parts of VS-1028 manufactured by Seiko PMC, 140 parts of pulverized sodium chloride, 32 parts of diethylene glycol, and 1.8 parts of xylene were fed into a 1 L pair complete kneader and kneaded at 30 캜 for 15 hours. After kneading, the mixture was taken out to 2 kg of water at 30 캜, stirred for 1 hour, filtered, washed, dried and pulverized to obtain pigment 5. The obtained pigment 5 had an average particle diameter of primary particles of 0.02 占 퐉 as measured by particle diameter measurement by a transmission electron microscope JEM-2010 manufactured by Japan Electronics Co.,

2.48 parts of the obtained pigment 5 was dispersed in a paint shaker for 2 hours using zircon beads of 0.3 to 0.4 mm together with 1.24 parts of BYK-LPN 6919, 1.86 parts of Unidic ZL-295 and 10.92 parts of propylene glycol monomethyl ether acetate, Composition 5 was obtained. 4.0 parts of Coloring Composition 5, 0.98 parts of Unidic ZL-295 and 0.22 parts of propylene glycol monomethyl ether acetate were added and mixed with a paint shaker to obtain Evaluation Composition 5 for forming a green pixel portion for a color filter. The composition for evaluation 5 was spin-coated on soda glass and dried at 90 占 폚 for 3 minutes to obtain a glass substrate for evaluation. The monochromatic spectral transmittance spectrum of the glass substrate for evaluation was measured using U-3900 manufactured by Hitachi High Technologies. The spectral transmittance spectra are shown in Figs. 1A, 1B and 1C.

[Production Example 6] (Pigment 6)

20 parts of crude pigment 1 of Production Example 1, 1.5 parts of X-1 manufactured by Seiko PMC, 140 parts of pulverized sodium chloride, 32 parts of diethylene glycol, and 1.8 parts of xylene were charged into a 1 L pair complete kneader and kneaded at 30 캜 for 15 hours. After kneading, the mixture was taken out to 2 kg of water at 30 캜, stirred for 1 hour, filtered, washed, dried and pulverized to obtain pigment 6. The obtained pigment 6 had an average particle diameter of primary particles of 0.02 mu m as measured by particle diameter measurement by a transmission electron microscope JEM-2010 manufactured by Nippon Electron Co., Ltd.

2.48 parts of the obtained pigment 6 was dispersed in a paint shaker for 2 hours using zircon beads of 0.3 to 0.4 mm together with 1.24 parts of BYK-LPN 6919, 1.86 parts of Unidic ZL-295 and 10.92 parts of propylene glycol monomethyl ether acetate, Composition 6 was obtained. 4.0 parts of Coloring Composition 6, 0.98 parts of Unidic ZL-295 and 0.22 parts of propylene glycol monomethyl ether acetate were added and mixed with a paint shaker to obtain Evaluation Composition 6 for forming a green pixel portion for a color filter. The composition for evaluation 6 was spin-coated on soda glass and dried at 90 占 폚 for 3 minutes to obtain a glass substrate for evaluation. The monochromatic spectral transmittance spectrum of the glass substrate for evaluation was measured using U-3900 manufactured by Hitachi High Technologies. The spectral transmittance spectra are shown in Figs. 1A, 1B and 1C.

[Production Example 7] (Pigment 7)

20 parts of crude pigment 1 of Production Example 1, 1.5 parts of JONCRYL690 manufactured by BASF, 140 parts of pulverized sodium chloride, 32 parts of diethylene glycol, and 1.8 parts of xylene were charged into a 1 L pair complete kneader and kneaded at 30 캜 for 15 hours. After kneading, the mixture was taken out to 2 kg of water at 30 캜, stirred for 1 hour, filtered, washed, dried and pulverized to obtain pigment 7. The obtained pigment 7 had an average particle diameter of primary particles of 0.02 mu m as measured by a particle diameter measurement by a transmission electron microscope JEM-2010 manufactured by JEOL Ltd.

2.48 parts of the obtained pigment 7 was dispersed in a paint shaker for 2 hours using zircon beads of 0.3 to 0.4 mm together with 1.24 parts of BYK-LPN 6919, 1.86 parts of Unidic ZL-295 and 10.92 parts of propylene glycol monomethyl ether acetate, Composition 7 was obtained. 4.0 parts of Coloring Composition 7, 0.98 parts of Unidic ZL-295 and 0.22 parts of propylene glycol monomethyl ether acetate were added and mixed with a paint shaker to obtain Evaluation Composition 7 for forming a green pixel portion for a color filter. The composition for evaluation 7 was spin-coated on soda glass and dried at 90 占 폚 for 3 minutes to obtain a glass substrate for evaluation. The monochromatic spectral transmittance spectrum of the glass substrate for evaluation was measured using U-3900 manufactured by Hitachi High Technologies. The spectral transmittance spectra are shown in Figs. 1A, 1B and 1C.

[Production Example 8] (Dispersion of Yellow Pigment)

1.65 parts of Pigment Yellow 138 (Paliotol Yellow L0960 HD, manufactured by BASF), 3.85 parts of DISPERBYK-161 (manufactured by Big Chemie) and 11.00 parts of propylene glycol monomethyl ether acetate were mixed with zircon beads of 0.3 to 0.4 mm in a paint shaker And dispersed for 2 hours to obtain a colored composition A. 4.0 parts of Coloring Composition A, 0.98 parts of Unidic ZL-295 and 0.22 parts of propylene glycol monomethyl ether acetate were added and mixed with a paint shaker to obtain a coloring composition.

[Example 1] (coloring by yellow pigment)

The coloring composition and evaluation composition 1, evaluation composition 2, evaluation composition 3, evaluation composition 4, evaluation composition 5, evaluation composition 6 (x, y) , Or the composition for evaluation 7 were mixed and film formation was conducted to obtain a glass substrate for evaluation. Using this glass substrate, the luminance in the C light source was measured with U-3900 manufactured by Hitachi High-Technologies Corporation. The results are shown in Table 1 below.

[Production Example 9] Pigment Green 58 (FASTOGEN Green A110)

2.48 parts of Pigment Green 58 (FASTOGEN Green A110), 1.24 parts of BYK-LPN 6919, 1.86 parts of Unidic ZL-295 and 10.92 parts of propylene glycol monomethyl ether acetate were mixed with 0.3 to 0.4 mm zircon beads in a paint shaker And dispersed for 2 hours to obtain Coloring Composition 9. 4.0 parts of Coloring Composition 9, 0.98 parts of Unidic ZL-295 and 0.22 parts of propylene glycol monomethyl ether acetate were added and mixed with a paint shaker to obtain Evaluation Composition 9 for forming a green pixel portion for a color filter. The composition for evaluation 9 was spin-coated on soda glass and dried at 90 占 폚 for 3 minutes to obtain a glass substrate for evaluation. The monochromatic spectral transmittance spectrum of the glass substrate for evaluation was measured using U-3900 manufactured by Hitachi High Technologies. The spectral transmittance spectra are shown in Figs. 1A, 1B and 1C.

[Production Example 10] Pigment Green 59 (FASTOGEN Green C100)

2.48 parts of Pigment Green 59 (FASTOGEN Green C100), 1.24 parts of BYK-LPN6919, 1.86 parts of Unidic ZL-295 and 10.92 parts of propylene glycol monomethyl ether acetate were mixed with 0.3 to 0.4 mm zircon beads in a paint shaker And dispersed for 2 hours to obtain Coloring Composition 10. 4.0 parts of Coloring Composition 10, 0.98 parts of Unidic ZL-295 and 0.22 parts of propylene glycol monomethyl ether acetate were added and mixed with a paint shaker to obtain Evaluation Composition 10 for forming a green pixel portion for a color filter. The composition for evaluation 10 was spin-coated on soda glass and dried at 90 占 폚 for 3 minutes to obtain a glass substrate for evaluation. The monochromatic spectral transmittance spectrum of the glass substrate for evaluation was measured using U-3900 manufactured by Hitachi High Technologies. The spectral transmittance spectra are shown in Figs. 1A, 1B and 1C.

[Production Example 11] Pigment Green 7 (FASTOGEN Green S)

1.65 parts of Pigment Green 7 (FASTOGEN Green S), 1.93 parts of BYK-LPN6919 and 12.93 parts of propylene glycol monomethyl ether acetate were dispersed in a paint shaker for 2 hours using 0.3 to 0.4 mm zircon beads to obtain Coloring Composition 11 &Lt; / RTI &gt; 6.0 parts of Coloring Composition 11, 1.47 parts of Unidic ZL-295 and 0.33 part of propylene glycol monomethyl ether acetate were added and mixed with a paint shaker to obtain Evaluation Composition 11 for forming a green pixel portion for a color filter. The composition for evaluation 11 was spin-coated on soda glass and dried at 90 캜 for 3 minutes to obtain a glass substrate for evaluation. The monochromatic spectral transmittance spectrum of the glass substrate for evaluation was measured using U-3900 manufactured by Hitachi High Technologies. The spectral transmittance spectra are shown in Figs. 1A and 1B. Since Pigment Green 7 is a pigment having a low transmittance, it floats when the coating film is formed so that the spectral transmittance at the maximum transmittance wavelength becomes 80%. Therefore, the spectral transmittance spectrum in the range of 580 to 620 nm shown in FIG. No data was shown.

[Production Example 12] Pigment Green 36 (FASTOGEN Green 2YK-50)

2.48 parts of Pigment Green 36 (FASTOGEN Green 2YK-50), 1.24 parts of BYK-LPN 6919, 1.86 parts of Unidic ZL-295 and 10.92 parts of propylene glycol monomethyl ether acetate were mixed with 0.3 to 0.4 mm zircon beads, And dispersed with a shaker for 2 hours to obtain a colored composition 12. 4.0 parts of Coloring Composition 12, 0.98 parts of Unidic ZL-295 and 0.22 parts of propylene glycol monomethyl ether acetate were added and mixed with a paint shaker to obtain Evaluation Composition 12 for forming a green pixel portion for a color filter. The composition for evaluation 12 was spin-coated on soda glass and dried at 90 占 폚 for 3 minutes to obtain a glass substrate for evaluation. The monochromatic spectral transmittance spectrum of the glass substrate for evaluation was measured using U-3900 manufactured by Hitachi High Technologies. The spectral transmittance spectra are shown in Figs. 1A, 1B and 1C.

[Comparative Example 1] (coloring by yellow pigment)

The coloring composition and the evaluation composition 9, the evaluation composition 10, the evaluation composition 11 or the evaluation composition 12 were mixed so that the coating film chromaticity was (x, y) = (0.275, 0.570) To obtain a substrate. Using this glass substrate, the luminance in the C light source was measured with U-3900 manufactured by Hitachi High-Technologies Corporation. The results are shown in Table 1 below.

It can be seen from Table 1 and FIGS. 1A, 1B and 1C that the transmittances of 555 nm are 50.47%, 50.28%, 47.41%, 45.73%, 46.45%, 50.07% and 45.89% Or more. The ratio (A) / (B) of the transmittance at a wavelength of 505 nm to the transmittance at a wavelength of 555 nm was 1.40, 1.44, 1.53, 1.57, 1.56, 1.42 and 1.59, and was 1.4 or more. The half widths were 73 nm, 75 nm, 73 nm, 68 nm, 68 nm, 71 nm, and 68 nm, and 80 nm or less.

(X, y) = (0.275, 0.570) in the C light source as compared with the compositions for evaluation 9 to 12, which are the conventional green pigments, in the composition for evaluation 1 to 7 The brightness after mixing was high.

Table 2 summarizes the halogen ratios of one of the pigments 1 to 3 in one zinc halide phthalocyanine.

From Table 2, the average number of bromine atoms in one molecule of zinc phthalocyanine was 14.13, 13.59, and 13.36, and ranged from 13 to 15 in pigments 1 to 3. Further, the average number of chlorine atoms in the zinc halide phthalocyanine halide was 1.60, 1.71, and 1.74, and ranged from 1 to 3. The ratio (E / (F)) of the average number of bromine atoms to the average number of chlorine atoms in one molecule of the zinc halide phthalocyanine was 8.83, 7.94, and 7.69, and was 7 or more.

By virtue of the halogen content, the pigments 1 to 3 can be green pigments having higher brightness than the conventional green pigments Pigment Green 58 and Pigment 59 while maintaining the green color.

From the above, it has become clear that the use of a green pigment having specific spectroscopic characteristics can form a color filter having higher luminance than the conventional one.

[Industrial Availability]

According to the pigment composition for a color filter of the present embodiment, it is possible to provide a high-luminance color filter capable of supplementing the characteristics of B-YAG which is a backlight having a weak green light emission intensity. In addition, since the green pixel formed by using the pigment composition for a color filter of the present embodiment has a high luminance, a liquid crystal display device including the color filter and the liquid crystal panel having such a high display performance with the green pixel can be manufactured .

Claims (5)

When a coating film is formed so that the spectral transmittance at the maximum transmission wavelength is 80%
The transmittance at a wavelength of 555 nm is 45% or more,
(T (505 nm) / T (555 nm)) of the transmittance at a wavelength of 505 nm and the transmittance at a wavelength of 555 nm is 1.40 or more,
A pigment composition for a color filter comprising a green pigment having a spectral characteristic having a half width of 80 nm or less. The method according to claim 1,
Wherein said green pigment is zinc phthalocyanine chlorinated bromide. The method according to claim 1 or 2,
Wherein the green pigment is zinc phthalocyanine chlorinated bromide having an average bromine content of 13 to 15 and an average chlorine content of 1 to 3 on one molecule. The method according to any one of claims 1 to 3,
A pigment composition for a color filter, further comprising a yellow pigment. A color filter comprising the pigment composition for a color filter according to any one of claims 1 to 4.

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