JP6972656B2 - Ink composition and its manufacturing method, light conversion layer and color filter - Google Patents

Description

The present invention relates to an ink composition, a method for producing the same, an optical conversion layer, and a color filter.

Conventionally, a color filter pixel portion in a display such as a liquid crystal display device uses, for example, a curable resist material containing red organic pigment particles or green organic pigment particles and an alkali-soluble resin and / or an acrylic monomer. , Has been manufactured by photolithography.

In recent years, there has been a strong demand for lower power consumption of displays, and instead of the red organic pigment particles or green organic pigment particles, luminescent nanocrystal particles such as quantum dots, quantum rods, and other inorganic phosphor particles have been strongly demanded. A method of forming a color filter pixel portion such as a red pixel and a green pixel by using the above is actively studied.

By the way, the method for manufacturing a color filter by the above photolithography method has a drawback that a resist material other than a pixel portion including relatively expensive luminescent nanocrystal particles is wasted due to the characteristics of the manufacturing method. Under such circumstances, in order to eliminate the waste of the resist material as described above, it has begun to be studied to form the pixel portion of the optical conversion substrate by the inkjet method (Patent Document 1).

International Publication No. 2008/001693

When a color filter pixel portion (hereinafter, also simply referred to as “pixel portion”) is formed by an ink composition using luminescent nanocrystal particles, the light from the light source is not absorbed by the luminescent nanocrystal particles and the pixel portion is formed. May leak from. Since such leakage light reduces the color reproducibility of the pixel portion, it is necessary to reduce it as much as possible.

Therefore, an object of the present invention is to provide an ink composition capable of reducing leakage light, a method for producing the same, and an optical conversion layer and a color filter using the ink composition.

One aspect of the present invention contains luminescent nanocrystal particles, light scattering particles, a polymer dispersant, a photopolymerizable compound, and / or a thermosetting resin, and luminescent nanocrystal particles. The present invention relates to an ink composition in which the mass ratio of the content of light-scattering particles to the content of light-scattering particles is 0.1 to 5.0. According to this ink composition, leakage light in the pixel portion can be reduced.

The mass ratio of the content of the light-scattering particles to the content of the luminescent nanocrystal particles may be 0.2 to 2.0.

The light-scattering particles may contain at least one selected from the group consisting of titanium oxide, alumina, zirconium oxide, zinc oxide, calcium carbonate, barium sulfate and silica.

When the ink composition contains a photopolymerizable compound, the photopolymerizable compound may be a photoradical polymerizable compound or a photocationic polymerizable compound. Further, the photopolymerizable compound may be alkali-insoluble.

When the ink composition contains a thermosetting resin, the thermosetting resin may be alkali-insoluble.

The ink composition may be an ink composition capable of forming an alkali-insoluble coating film.

The surface tension of the ink composition may be 20-40 mN / m.

The viscosity of the ink composition may be 2 to 20 mPa · s.

The ink composition may further contain a solvent having a boiling point of 180 ° C. or higher.

The ink composition may be for a color filter.

The ink composition may be an ink composition (inkjet ink) used in an inkjet method.

One aspect of the present invention relates to an optical conversion layer including a plurality of pixel portions, wherein the plurality of pixel portions have pixel portions including a cured product of the ink composition described above. According to this optical conversion layer, leakage of light in the pixel portion can be reduced.

The optical conversion layer may further include a light-shielding portion provided between the plurality of pixel portions, and the plurality of pixel portions contain the above-mentioned cured product and have a wavelength in the range of 420 to 480 nm as luminescent nanocrystal particles. A first pixel portion containing luminescent nanocrystalline particles that absorb the light of the above and emit light having a emission peak wavelength in the range of 605 nm to 665 nm, and the cured product, and as luminescent nanocrystal particles. It may have a second pixel portion containing luminescent nanoparticles that absorb light having a wavelength in the range of 420 to 480 nm and emit light having a emission peak wavelength in the range of 500 to 560 nm.

The plurality of pixel portions may further include a third pixel portion having a transmittance of 30% or more with respect to light having a wavelength in the range of 420 to 480 nm.

The content of the light-scattering particles in the pixel portion including the cured product may be 0.1 to 40% by mass or 7 to 30% by mass based on the total mass of the cured product.

One aspect of the present invention relates to a color filter including the above-mentioned optical conversion layer. According to this color filter, leakage light in the pixel portion can be reduced.

One aspect of the present invention is a first step of preparing a dispersion of light-scattering particles containing a light-scattering particle and a polymer dispersant, and a dispersion of light-scattering particles and luminescent nanocrystal particles. The present invention relates to a method for producing an ink composition, comprising a second step of mixing. According to this method, it is possible to easily obtain an ink composition capable of reducing leakage light in the pixel portion.

The dispersion of the light-scattering particles may further contain a photopolymerizable compound and / or a thermosetting resin.

In the second step, the photopolymerizable compound and / or the thermosetting resin may be further mixed.

The method for producing an ink composition may further include a step of preparing a dispersion of luminescent nanocrystal particles containing the luminescent nanocrystal particles, a photopolymerizable compound, and / or a thermosetting resin. .. In this case, in the second step, the dispersion of the light-scattering particles and the dispersion of the luminescent nanocrystal particles may be mixed.

According to the present invention, it is possible to provide an ink composition capable of reducing leakage light, a method for producing the same, and an optical conversion layer and a color filter using the ink composition.

FIG. 1 is a schematic cross-sectional view of a color filter according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail.

<Ink composition>
The ink composition of one embodiment contains luminescent nanocrystal particles, light scattering particles, a polymer dispersant, a photopolymerizable compound, and / or a thermosetting resin. In this ink composition, the mass ratio of the content of the light-scattering particles to the content of the luminescent nanocrystal particles is 0.1 to 5.0. The ink composition of one embodiment is an ink composition for a color filter used for forming a pixel portion of a color filter by, for example, a photolithography method, an inkjet method, or the like.

The ink composition of one embodiment is suitably used for an application of forming a color filter pixel portion by an inkjet method. When a color filter pixel portion is formed by an inkjet method using a conventional ink composition, it is difficult to reduce light leakage from the pixel portion. On the other hand, according to the ink composition of the embodiment, it is possible to obtain a pixel portion having an excellent effect of reducing leakage light even by an inkjet method. Further, when the color filter pixel portion is formed by the inkjet method using the conventional ink composition, the ejection stability from the inkjet nozzle may be deteriorated. It is conceivable to improve the ejection stability by reducing the dispersed particle size of the luminescent nanocrystal particles and the light scattering particles, reducing the content of the luminescent nanocrystal particles and the light scattering particles, and the like. In this case, the effect of reducing leakage light tends to decrease, and it is difficult to achieve both sufficient ejection stability and the effect of reducing leakage light. On the other hand, according to the ink composition of the embodiment, leakage light can be reduced while ensuring sufficient ejection stability.

Hereinafter, an ink composition for a color filter (inkjet ink for a color filter) used in an inkjet method will be described as an example.

[Luminescent nanocrystal particles]
The luminescent nanocrystal particles are nano-sized crystals that absorb excitation light and emit fluorescence or phosphorescence, and for example, the maximum particle size measured by a transmission electron microscope or a scanning electron microscope is 100 nm or less. It is a crystal.

The luminescent nanocrystal particles can emit light (fluorescence or phosphorescence) having a wavelength different from the absorbed wavelength, for example, by absorbing light having a predetermined wavelength. The luminescent nanocrystal particles may be red luminescent nanocrystal particles that emit light having an emission peak wavelength in the range of 605 to 665 nm (red light), and may be light having an emission peak wavelength in the range of 500 to 560 nm. It may be a green light emitting nanocrystal particle that emits (green light), or may be a blue light emitting nanocrystal particle that emits light (blue light) having an emission peak wavelength in the range of 420 to 480 nm. .. In one embodiment, the ink composition preferably comprises at least one of these luminescent nanocrystal particles. The light absorbed by the luminescent nanocrystal particles may be, for example, light having a wavelength in the range of 400 nm or more and less than 500 nm (blue light) or light having a wavelength in the range of 200 nm to 400 nm (ultraviolet light). The emission peak wavelength of the luminescent nanocrystal particles can be confirmed, for example, in the fluorescence spectrum or the phosphorescence spectrum measured by using an ultraviolet-visible spectrophotometer.

The red-emitting nanocrystal particles are 665 nm or less, 663 nm or less, 660 nm or less, 658 nm or less, 655 nm or less, 653 nm or less, 651 nm or less, 650 nm or less, 647 nm or less, 645 nm or less, 643 nm or less, 640 nm or less, 637 nm or less, 635 nm or less. It is preferable to have an emission peak wavelength of 632 nm or less or 630 nm or less, and it is preferable to have an emission peak wavelength of 628 nm or more, 625 nm or more, 623 nm or more, 620 nm or more, 615 nm or more, 610 nm or more, 607 nm or more or 605 nm or more. These upper limit values and lower limit values can be arbitrarily combined. In the same description below, the upper limit value and the lower limit value described individually can be arbitrarily combined.

Green luminescent nanocrystal particles have emission peak wavelengths of 560 nm or less, 557 nm or less, 555 nm or less, 550 nm or less, 547 nm or less, 545 nm or less, 543 nm or less, 540 nm or less, 537 nm or less, 535 nm or less, 532 nm or less, or 530 nm or less. It is preferable to have an emission peak wavelength of 528 nm or more, 525 nm or more, 523 nm or more, 520 nm or more, 515 nm or more, 510 nm or more, 507 nm or more, 505 nm or more, 503 nm or more, or 500 nm or more.

Blue luminescent nanocrystal particles have emission peak wavelengths of 480 nm or less, 477 nm or less, 475 nm or less, 470 nm or less, 467 nm or less, 465 nm or less, 463 nm or less, 460 nm or less, 457 nm or less, 455 nm or less, 452 nm or less, or 450 nm or less. It is preferable to have an emission peak wavelength at 450 nm or more, 445 nm or more, 440 nm or more, 435 nm or more, 430 nm or more, 428 nm or more, 425 nm or more, 422 nm or more, or 420 nm or more.

The wavelength of light emitted by luminescent nanocrystal particles (emission color) depends on the size (for example, particle size) of the luminescent nanocrystal particles according to the solution of the Schrodinger wave equation of the well-type potential model, but the luminescent nanocrystal particles It also depends on the energy gap of the crystal particles. Therefore, the emission color can be selected by changing the constituent material and size of the luminescent nanocrystal particles to be used.

The luminescent nanocrystal particles may be luminescent nanocrystal particles (luminescent semiconductor nanocrystal particles) containing a semiconductor material. Examples of the luminescent semiconductor nanocrystal particles include quantum dots (hereinafter, also referred to as “QD”), quantum rods, and the like. Among these, quantum dots are preferable from the viewpoints that the emission spectrum can be easily controlled, reliability can be ensured, production cost can be reduced, and mass productivity can be improved.

The luminescent semiconductor nanocrystal particles may consist only of a core containing the first semiconductor material, and include a core containing the first semiconductor material and a second semiconductor material different from the first semiconductor material, as described above. It may have a shell that covers at least a portion of the core. In other words, the structure of the luminescent semiconductor nanocrystal particles may be a structure consisting of only a core (core structure) or a structure consisting of a core and a shell (core / shell structure). Further, the luminescent semiconductor nanocrystal particles include a third semiconductor material different from the first and second semiconductor materials in addition to the shell (first shell) containing the second semiconductor material, and the above-mentioned core. It may further have a shell (second shell) that covers at least a part of it. In other words, the structure of the luminescent semiconductor nanocrystal particles may be a structure including a core, a first shell, and a second shell (core / shell / shell structure). Each of the core and the shell may be a mixed crystal containing two or more kinds of semiconductor materials (for example, CdSe + CdS, CIS + ZnS, etc.).

The luminescent nanocrystal particles are selected as the semiconductor material from the group consisting of II-VI group semiconductors, III-V group semiconductors, I-III-VI group semiconductors, IV group semiconductors and I-II-IV-VI group semiconductors. It is preferable to include at least one kind of semiconductor material.

Specific semiconductor materials include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeDZn. CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, CdHgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSeTe, CdHgSeTe, AlHgSte, HgZnS InP, InAs, InSb, PLUP, PLGAs, VMwareSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, GaAlNAs, GaAlNSb GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb; SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSe, PbSnS, SnPbSTe; Si, Ge, SiC, SiGe, AgInSe ₂ , CuGaSe ₂ , CuInS ₂ , CuGaS ₂ , CuInSe ₂ , AgInS ₂ , AgGaSe ₂ , AgGaS ₂ , C, Si and Ge. The luminescent semiconductor nanocrystal particles have CdS, CdSe, CdTe, ZnS, from the viewpoint that the emission spectrum can be easily controlled, reliability can be ensured, production cost can be reduced, and mass productivity can be improved. _{ZnSe, ZnTe, ZnO, HgS,} HgSe, HgTe, InP, InAs, InSb, GaP, GaAs, GaSb, AgInS 2, AgInSe 2, AgInTe 2, AgGaS 2, AgGaSe 2, AgGaTe 2, CuInS 2, CuInSe 2, CuInTe 2 , CuGaS ₂ , CuGaSe ₂ , CuGaTe ₂ , Si, C, Ge and Cu ₂ ZnSnS ₄ preferably comprises at least one selected from the group.

Examples of the red-emitting semiconductor nanocrystal particles include CdSe nanocrystal particles, CdSe rod-shaped nanocrystal particles, and rod-shaped nanocrystal particles having a core-shell structure, wherein the shell portion is CdS. The inner core portion is CdSe nanocrystal particles and rod-shaped nanocrystal particles having a core-shell structure, and the shell portion is CdS and the inner core portion is ZnSe nanocrystal particles and the core-shell structure is provided. Nanocrystal particles having a shell portion of CdS and an inner core portion of CdSe, and nanocrystal particles having a core-shell structure, wherein the shell portion is CdS and an inner core portion. Is ZnSe, nanocrystal particles in which CdSe and ZnS are mixed, rod-shaped nanocrystals in which CdSe and ZnS are mixed, InP nanocrystal particles, InP nanocrystal particles, InP rod. Nanocrystal particles of the shape, nanocrystal particles of mixed crystal of CdSe and CdS, rod-shaped nanocrystal particles of mixed crystal of CdSe and CdS, nanocrystal particles of mixed crystal of ZnSe and CdS, ZnSe and CdS Examples thereof include mixed crystal rod-shaped nanocrystal particles.

Examples of the green light emitting semiconductor nanocrystal particles include CdSe nanocrystal particles, CdSe rod-shaped nanocrystal particles, mixed crystal nanoparticles of CdSe and ZnS, and rod-shaped mixed crystals of CdSe and ZnS. Nanocrystal particles and the like can be mentioned.

Examples of the blue-emitting semiconductor nanocrystal particles include ZnSe nanocrystal particles, ZnSe rod-shaped nanocrystal particles, ZnS nanocrystal particles, ZnS rod-shaped nanocrystal particles, and nanocrystals having a core-shell structure. Nanocrystal particles having a shell portion of ZnSe and an inner core portion of ZnS, and rod-shaped nanocrystals having a core-shell structure, the shell portion of which is ZnSe and an inner core portion of the particles. Examples thereof include ZnS nanocrystal particles, CdS nanocrystal particles, and CdS rod-shaped nanocrystal particles. The semiconductor nanocrystal particles have the same chemical composition, and by changing the average particle size of the particles themselves, the color to be emitted from the particles can be changed to red or green. Further, it is preferable to use semiconductor nanocrystal particles as such, which have as little adverse effect on the human body as possible. When semiconductor nanocrystal particles containing cadmium, selenium, etc. are used as luminescent nanocrystal particles, semiconductor nanocrystal particles containing the above elements (cadmium, selenium, etc.) as little as possible are selected and used alone, or the above elements. It is preferable to use it in combination with other luminescent nanocrystal particles so that the amount is as small as possible.

The shape of the luminescent nanocrystal particles is not particularly limited, and may be any geometric shape or any irregular shape. The shape of the luminescent nanocrystal particles may be, for example, spherical, ellipsoidal, pyramidal, disc-shaped, branched, net-shaped, rod-shaped, or the like. However, as the luminescent nanocrystal particles, using particles having less directionality as the particle shape (for example, particles having a spherical shape, a regular tetrahedron shape, etc.) can further improve the uniformity and fluidity of the ink composition. Is preferable.

The average particle size (volume average diameter) of the luminescent nanocrystal particles may be 1 nm or more, and may be 1.5 nm, from the viewpoint of easily obtaining light emission of a desired wavelength and from the viewpoint of excellent dispersibility and storage stability. It may be more than 2 nm and may be 2 nm or more. From the viewpoint that a desired emission wavelength can be easily obtained, it may be 40 nm or less, 30 nm or less, or 20 nm or less. The average particle diameter (volume average diameter) of the luminescent nanocrystal particles is obtained by measuring with a transmission electron microscope or a scanning electron microscope and calculating the volume average diameter.

From the viewpoint of dispersion stability, the luminescent nanocrystal particles preferably have an organic ligand on the surface thereof. The organic ligand may be coordinate-bonded to, for example, the surface of the luminescent nanocrystal particles. In other words, the surface of the luminescent nanocrystal particles may be passivated by an organic ligand. Further, the luminescent nanocrystal particles may have a polymer dispersant on the surface thereof. In one embodiment, for example, the organic ligand is removed from the luminescent nanocrystalline particles having the above-mentioned organic ligand, and the organic ligand is exchanged with the polymer dispersant to cause the polymer dispersant on the surface of the luminescent nanoparticles. May be combined. However, from the viewpoint of dispersion stability when the ink jet ink is used, it is preferable that the polymer dispersant is blended with the luminescent nanocrystal particles in which the organic ligand is coordinated.

Examples of the organic ligand include TOP (trioctylphosphine), TOPO (trioctylphosphine oxide), oleic acid, oleylamine, octylamine, trioctylamine, hexadecylamine, octanethiol, dodecanethiol, and hexylphosphonic acid ( HPA), tetradecylphosphonic acid (TDPA), and octylphosphinic acid (OPA).

As the luminescent nanocrystal particles, those dispersed in a colloidal form in an organic solvent, a photopolymerizable compound, or the like can be used. The surface of the luminescent nanocrystal particles dispersed in the organic solvent is preferably passivated by the above-mentioned organic ligand. Examples of the organic solvent include cyclohexane, hexane, heptane, chloroform, toluene, octane, chlorobenzene, tetralin, diphenyl ether, propylene glycol monomethyl ether acetate, butyl carbitol acetate, or a mixture thereof.

Commercially available products can be used as the luminescent nanocrystal particles. Examples of commercially available luminescent nanocrystal particles include indium phosphide / zinc sulfide, D-dot, CuInS / ZnS from NN-Labs, and InP / ZnS from Aldrich.

The content of the luminescent nanocrystal particles may be 5% by mass or more, or 10% by mass or more, based on the mass of the non-volatile content of the ink composition, from the viewpoint of being more excellent in the effect of reducing leakage light. , 15% by mass or more, 20% by mass or more, 30% by mass or more, or 40% by mass or more. The content of the luminescent nanocrystal particles may be 70% by mass or less, 60% by mass or less, 55 by mass, based on the mass of the non-volatile content of the ink composition from the viewpoint of excellent ejection stability. It may be 50% by mass or less, or 50% by mass or less. In the present specification, the "mass of the non-volatile component of the ink composition" refers to the mass obtained by subtracting the mass of the solvent from the total mass of the ink composition when the ink composition contains a solvent, and the ink composition refers to the ink composition. In the absence of solvent, it refers to the total mass of the ink composition.

By the way, the luminescent nanocrystal particles have high reactivity because they have surface atoms that can serve as coordination sites. Luminescent nanocrystal particles have such high reactivity and have a large surface area as compared with general pigments, so that particles are likely to aggregate. Since the luminescent nanocrystal particles emit light due to the quantum size effect, a quenching phenomenon occurs when the particles are aggregated, which causes a decrease in the fluorescence quantum yield and a decrease in brightness and color reproducibility. On the other hand, in the present embodiment, since the ink composition contains the polymer dispersant, the luminescent nanocrystal particles are unlikely to aggregate. Therefore, in the present embodiment, the content of the luminescent nanocrystal particles can be within the above range.

[Light scattering particles]
The light-scattering particles are, for example, optically inert inorganic particles. The light-scattering particles can scatter the light from the light source irradiated to the color filter pixel portion.

Materials constituting the light-scattering particles include, for example, simple metal such as tungsten, zirconium, titanium, platinum, bismuth, rhodium, palladium, silver, tin, platinum and gold; silica, barium sulfate, barium carbonate, calcium carbonate, etc. Metal oxides such as talc, titanium oxide, clay, kaolin, barium sulfate, barium carbonate, calcium carbonate, alumina white, titanium oxide, magnesium oxide, barium oxide, aluminum oxide, bismuth oxide, zirconium oxide, zinc oxide; magnesium carbonate, Metal carbonates such as barium carbonate, bismuth subcarbonate, calcium carbonate; metal hydroxides such as aluminum hydroxide; composite oxides such as barium zirconate, calcium zirconate, calcium titanate, barium titanate, strontium titanate, etc. Examples thereof include metal salts such as bismuth subnitrate. The light-scattering particles preferably contain at least one selected from the group consisting of titanium oxide, alumina, zirconium oxide, zinc oxide, calcium carbonate, barium sulfate and silica from the viewpoint of being more excellent in reducing light leakage. It is more preferable to contain at least one selected from the group consisting of titanium oxide, barium sulfate and calcium carbonate.

The shape of the light-scattering particles may be spherical, filamentous, indefinite, or the like. However, as the light-scattering particles, it is possible to use particles having less directional particle shape (for example, particles having a spherical shape, a regular tetrahedron shape, etc.) to improve the uniformity, fluidity, and light scattering property of the ink composition. It is preferable in that it can be enhanced.

The average particle diameter (volume average diameter) of the light-scattering particles in the ink composition may be 0.05 μm or more, or 0.2 μm or more, from the viewpoint of being more excellent in the effect of reducing leakage light. It may be 0.3 μm or more. The average particle diameter (volume average diameter) of the light-scattering particles in the ink composition may be 1.0 μm or less, 0.6 μm or less, or 0, from the viewpoint of excellent ejection stability. It may be 0.4 μm or less. The average particle diameter (volume average diameter) of the light-scattering particles in the ink composition is 0.05 to 1.0 μm, 0.05 to 0.6 μm, 0.05 to 0.4 μm, 0.2 to 1. It may be 0.0 μm, 0.2 to 0.6 μm, 0.2 to 0.4 μm, 0.3 to 1.0 μm, 0.3 to 0.6 μm, or 0.3 to 0.4 μm. From the viewpoint that such an average particle diameter (volume average diameter) can be easily obtained, the average particle diameter (volume average diameter) of the light-scattering particles used may be 50 nm or more, and may be 1000 nm or less. The average particle diameter (volume average diameter) of the light-scattering particles is obtained by measuring with a dynamic light-scattering nanotrack particle size distribution meter and calculating the volume average diameter. Further, the average particle diameter (volume average diameter) of the light-scattering particles to be used can be obtained by measuring the particle diameter of each particle with, for example, a transmission electron microscope or a scanning electron microscope, and calculating the volume average diameter.

The content of the light-scattering particles may be 0.1% by mass or more, or even 1% by mass or more, based on the mass of the non-volatile content of the ink composition from the viewpoint of being more excellent in the effect of reducing leakage light. It may be 5% by mass or more, 7% by mass or more, 10% by mass or more, or 12% by mass or more. The content of the light-scattering particles may be 60% by mass or less, and 50% by mass, based on the mass of the non-volatile content of the ink composition from the viewpoint of excellent effect of reducing leakage light and excellent ejection stability. It may be less than or equal to 40% by mass, may be 30% by mass or less, may be 25% by mass or less, may be 20% by mass or less, and may be 15% by mass. It may be as follows. In the present embodiment, since the ink composition contains a polymer dispersant, the light-scattering particles can be satisfactorily dispersed even when the content of the light-scattering particles is within the above range.

The mass ratio of the content of the light-scattering particles to the content of the luminescent nanocrystal particles (light-scattering particles / luminescent nanocrystal particles) is 0.1 to 5.0. The mass ratio (light-scattering particles / luminescent nanocrystal particles) may be 0.2 or more, or 0.5 or more, from the viewpoint of being more excellent in the effect of reducing leaked light. The mass ratio (light-scattering particles / luminescent nanocrystal particles) may be 2.0 or less, and may be 1.5 or less, from the viewpoint of excellent light leakage reduction effect and excellent continuous ejection property during inkjet printing. May be. The mass ratio (light-scattering particles / luminescent nanocrystal particles) is 0.1 to 2.0, 0.1 to 1.5, 0.2 to 5.0, 0.2 to 2.0, 0. It may be 2 to 1.5, 0.5 to 5.0, 0.5 to 2.0, or 0.5 to 1.5. The reduction of leaked light by the light-scattering particles is considered to be due to the following mechanism. That is, in the absence of light-scattering particles, the backlight light only travels almost straight through the pixel portion and is considered to have little chance of being absorbed by the luminescent nanocrystal particles. On the other hand, when the light-scattering particles are present in the same pixel portion as the luminescent nanocrystal particles, the backlight light is scattered in all directions in the pixel portion, and the luminescent nanocrystal particles can receive the light. Even if the same backlight is used, it is considered that the amount of light absorption in the pixel portion increases. As a result, it is considered that such a mechanism makes it possible to prevent light leakage.

[Polymer dispersant]
In the present invention, the polymer dispersant is a polymer compound having a weight average molecular weight of 750 or more and having a functional group having an affinity for light-scattering particles, and has a function of dispersing the light-scattering particles. Have. In the polymer dispersant, the polymer dispersant is adsorbed on the light-scattering particles via a functional group having an affinity for the light-scattering particles, and the polymer dispersants undergo electrostatic repulsion and / or steric repulsion between the polymer dispersants. Light-scattering particles are dispersed in the ink composition. The polymer dispersant is preferably bound to the surface of the light-scattering particles and adsorbed to the light-scattering particles, but is bound to the surface of the luminescent nanoparticles and adsorbed to the luminescent nanoparticles. It may be free in the ink composition.

Examples of the functional group having an affinity for light-scattering particles include an acidic functional group, a basic functional group and a nonionic functional group. The acidic functional group has a dissociative proton and may be neutralized by a base such as an amine or a hydroxide ion, and the basic functional group is neutralized by an acid such as an organic acid or an inorganic acid. May be.

Examples of the acidic functional group include a carboxyl group (-COOH), a sulfo group (-SO ₃ H), a sulfate group (-OSO ₃ H), a phosphonic acid group (-PO (OH) ₃ ), and a phosphate group (-OPO (-OPO)). OH) ₃ ), phosphinic acid group (-PO (OH)-), mercapto group (-SH), and the like.

Examples of the basic functional group include primary, secondary and tertiary amino groups, ammonium groups, imino groups, and nitrogen-containing heterocyclic groups such as pyridine, pyrimidine, pyrazine, imidazole, and triazole.

The nonionic functional group, hydroxy group, an ether group, a thioether group, a sulfinyl group (-SO-), a sulfonyl group _(-SO 2 -), a carbonyl group, a formyl group, an ester group, carbonic ester group, an amide group, Examples thereof include a carbamoyl group, a ureido group, a thioamide group, a thioureido group, a sulfamoyl group, a cyano group, an alkenyl group, an alkynyl group, a phosphin oxide group and a phosphin sulfide group.

Acidic functionality from the viewpoint of dispersion stability of light-scattering particles, less likely to cause the side effect of sedimentation of luminescent nanocrystal particles, ease of synthesis of polymer dispersant, and stability of functional groups. As the group, a carboxyl group, a sulfo group, a phosphonic acid group and a phosphoric acid group are preferably used, and as a basic functional group, an amino group is preferably used. Among these, a carboxyl group, a phosphonic acid group and an amino group are more preferably used, and most preferably an amino group is used.

Polymer dispersants with acidic functional groups have an acid value. The acid value of the polymer dispersant having an acidic functional group is preferably 1 to 150 mgKOH / g in terms of solid content. When the acid value is 1 or more, sufficient dispersibility of the light-scattering particles can be easily obtained, and when the acid value is 150 or less, the storage stability of the pixel portion (cured product of the ink composition) is unlikely to decrease. ..

Further, the polymer dispersant having a basic functional group has an amine value. The amine value of the polymer dispersant having a basic functional group is preferably 1 to 200 mgKOH / g in terms of solid content. When the amine value is 1 or more, sufficient dispersibility of the light-scattering particles can be easily obtained, and when the amine value is 200 or less, the storage stability of the pixel portion (cured product of the ink composition) is unlikely to decrease. ..

The polymer dispersant may be a polymer (homopolymer) of a single monomer, or may be a copolymer (copolymer) of a plurality of types of monomers. Further, the polymer dispersant may be any of a random copolymer, a block copolymer or a graft copolymer. When the polymer dispersant is a graft copolymer, it may be a comb-shaped graft copolymer or a star-shaped graft copolymer. Examples of the polymer dispersant include acrylic resin, polyester resin, polyurethane resin, polyamide resin, polyether, phenol resin, silicone resin, polyurea resin, amino resin, polyamine such as polyethyleneimine and polyallylamine, epoxy resin, and polyimide. It may be there.

Commercially available products can be used as the polymer dispersant, and the commercially available products include Ajinomoto Fine-Techno Co., Ltd.'s Azispar PB series, BYK's DISPERBYK series, BYK-series, and BASF's Efka series. Etc. can be used.

Examples of commercially available products include "DISPERBYK-130", "DISPERBYK-161", "DISPERBYK-162", "DISPERBYK-163", "DISPERBYK-164", "DISPERBYK-166", and "DISPERBYK-" manufactured by Big Chemie. 167 ”,“ DISPERBYK-168 ”,“ DISPERBYK-170 ”,“ DISPERBYK-171 ”,“ DISPERBYK-174 ”,“ DISPERBYK-180 ”,“ DISPERBYK-182 ”,“ DISPERBYK-183 ”,“ DISPERBYK-184 ” , "DISPERBYK-185", "DISPERBYK-2000", "DISPERBYK-2001", "DISPERBYK-2008", "DISPERBYK-2009", "DISPERBYK-2020", "DISPERBYK-2022", "DISPERBYK-2025" DISPERBYK-2050, "DISPERBYK-2070", "DISPERBYK-2096", "DISPERBYK-2150", "DISPERBYK-2155", "DISPERBYK-2163", "DISPERBYK-2164", "BYK-LPN21116" LPN6919 ”; BASF's“ EFKA4010 ”,“ EFKA4015 ”,“ EFKA4046 ”,“ EFKA4047 ”,“ EFKA4061 ”,“ EFKA4080 ”,“ EFKA4300 ”,“ EFKA4310 ”,“ EFKA4320 ”,“ EFKA4320 ” , "EFKA4560", "EFKA4585", "EFKA5207", "EFKA1501", "EFKA1502", "EFKA1503" and "EFKA PX-4701"; , "Solspers 13650", "Solspers 13940", "Solspers 11200", "Solspers 13940", "Solspers 16000", "Solspers 17000", "Solspers 18000", "Solspers 20000", "Solspers 21000", "Solspers 24000" , "Sol Sparse 26000", "Sol Sparse 27000", "Sol Sparse 28000", "Sol Sparse 32000" , "Sol Sparse 32500", "Sol Sparse 32550", "Sol Spur 32600", "Sol Sparse 33000", "Sol Sparse 34750", "Sol Sparse 35100", "Sol Sparse 35200", "Sol Sparse 36000", "Sol Sparse 37500", "Sol Sparse 38500" , "Solspur 39000", "Solspers 41000", "Solspers 54000", "Solspers 71000" and "Solspers 76500"; PN411 "and" PA111 "; Evonik's" TEGO Dispers 650 "," TEGO Dispers 660C "," TEGO Dispers 662C "," TEGO Dispers 670 "," TEGO Dispers 685 "," TEGO Dispers 685 "," TEGO Dis "Disparon DA-703-50", "DA-705", "DA-725" and the like manufactured by Kusumoto Kasei can be used.

As the polymer dispersant, in addition to the commercially available products as described above, a cationic monomer containing a basic group and / or an anionic monomer having an acidic group, a monomer having a hydrophobic group, and other monomers as necessary. A product synthesized by copolymerizing with (a nonionic monomer, a monomer having a hydrophilic group, etc.) can be used. For details of the cationic monomer, the anionic monomer, the monomer having a hydrophobic group and other monomers, the monomers described in paragraphs 0034 to 0036 of JP-A-2004-250502 can be mentioned.

Further, for example, a compound obtained by reacting a polyester compound with a polyalkyleneimine described in JP-A-54-37082, JP-A-61-174939, etc., and a polyallylamine described in JP-A-9-169821. A compound in which the amino group of the side chain is modified with polyester, a graft polymer containing the polyester-type macromonomer described in JP-A-9-171253 as a copolymerization component, and the addition of a polyester polyol described in JP-A-60-166318. Polyurethane and the like are preferably mentioned.

The weight average molecular weight of the polymer dispersant may be 750 or more, and may be 1000 or more, from the viewpoint that light-scattering particles can be satisfactorily dispersed and the effect of reducing leakage light can be further improved. It may be 2000 or more, and may be 3000 or more. The weight average molecular weight of the polymer dispersant can satisfactorily disperse light-scattering particles, further improve the effect of reducing leakage light, and can eject the viscosity of the inkjet ink, which is suitable for stable ejection. From the viewpoint of viscosity, it may be 100,000 or less, 50,000 or less, or 30,000 or less. In the present specification, the weight average molecular weight is a polystyrene-equivalent weight average molecular weight measured by GPC (Gel Permeation Chromatography).

From the viewpoint of the dispersibility of the light-scattering particles, the content of the polymer dispersant may be 0.5 parts by mass or more with respect to 100 parts by mass of the light-scattering particles, and may be 2 parts by mass or more. It may be 5 parts by mass or more. The content of the polymer dispersion may be 50 parts by mass or less and 30 parts by mass or less with respect to 100 parts by mass of the light-scattering particles from the viewpoint of moist heat stability of the pixel portion (cured product of the ink composition). It may be 10 parts by mass or less.

[Photopolymerizable compound]
The photopolymerizable compound of the present embodiment is a photoradical polymerizable compound or a photocationic polymerizable compound that is polymerized by irradiation with light, and may be a photopolymerizable monomer or oligomer. These are used with photopolymerization initiators. The photoradical polymerizable compound is used together with the photoradical polymerization initiator, and the photocationic polymerizable compound is used together with the photocationic polymerization initiator. In other words, the ink composition may contain a photopolymerizable component containing a photopolymerizable compound and a photopolymerization initiator, and may contain a photoradical polymerizable component containing a photoradical polymerizable compound and a photoradical polymerization initiator. It may contain a photocationic polymerizable component including a photocationic polymerizable compound and a photocationic polymerization initiator. A photoradical polymerizable compound and a photocationic polymerizable compound may be used in combination, or a compound having photoradical polymerizable property and photocationic polymerizable property may be used, and a photoradical polymerization initiator and a photocationic polymerization initiator may be used. May be used together. One type of photopolymerizable compound may be used alone, or two or more types may be used in combination.

Examples of the photoradical polymerizable compound include (meth) acrylate compounds. The (meth) acrylate compound may be a monofunctional (meth) acrylate having one (meth) acryloyl group, or may be a polyfunctional (meth) acrylate having a plurality of (meth) acryloyl groups. Monofunctional (meth) acrylates and polyfunctional (meth) acrylates and polyfunctional (meth) acrylates and polyfunctional (meth) acrylates from the viewpoints of excellent fluidity when made into ink, excellent ejection stability, and suppression of deterioration of smoothness due to curing shrinkage during color filter manufacturing. ) It is preferable to use it in combination with acrylate. In addition, in this specification, (meth) acrylate means "acrylate" and corresponding "methacrylate". The same applies to the expression "(meth) acryloyl".

Examples of the monofunctional (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, amyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and octyl. (Meta) acrylate, nonyl (meth) acrylate, dodecyl (meth) acrylate, hexadecyl (meth) acrylate, octadecyl (meth) acrylate, cyclohexyl (meth) acrylate, methoxyethyl (meth) acrylate, butoxyethyl (meth) acrylate, phenoxy Ethyl (meth) acrylate, nonylphenoxyethyl (meth) acrylate, glycidyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentanyl (meth) acrylate, Dicyclopentenyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, benzyl (Meta) acrylate, phenylbenzyl (meth) acrylate, monosuccinate (2-acryloyloxyethyl), N- [2- (acryloyloxy) ethyl] phthalimide, N- [2- (acryloyloxy) ethyl] tetrahydrophthalimide, etc. Can be mentioned.

The polyfunctional (meth) acrylate may be a bifunctional (meth) acrylate, a trifunctional (meth) acrylate, a tetrafunctional (meth) acrylate, a pentafunctional (meth) acrylate, a hexafunctional (meth) acrylate, or the like, and may be, for example. A di (meth) acrylate in which two hydroxyl groups of a diol compound are substituted with a (meth) acryloyloxy group, and a di or tri (meth) acrylate in which two or three hydroxyl groups of a triol compound are substituted with a (meth) acryloyloxy group. And so on.

Specific examples of the bifunctional (meth) acrylate include 1,3-butylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,5-pentanediol di (meth) acrylate, and 3-. Methyl-1,5-pentanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,8-octanediol di (meth) acrylate, 1,9 -Nonandiol di (meth) acrylate, tricyclodecanedimethanol di (meth) acrylate, ethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, dipropylene glycol di (meth). ) Acrylate, tripropylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, neopentylglycol hydroxypivalic acid ester diacrylate, tris (2-hydroxyethyl) isocyanurate. Di (meth) acrylate substituted with a (meth) acryloyloxy group, two hydroxyl groups of a diol obtained by adding 4 mol or more of ethylene oxide or propylene oxide to 1 mol of neopentyl glycol are substituted with a (meth) acryloyloxy group. Di (meth) acrylate, bisphenol A di (meth) acrylate, trimethylol in which two hydroxyl groups of a diol obtained by adding 2 mol of ethylene oxide or propylene oxide to 1 mol of A is substituted with a (meth) acryloyloxy group. Di (meth) acrylate in which two hydroxyl groups of triol obtained by adding 3 mol or more of ethylene oxide or propylene oxide to 1 mol of propane is substituted with a (meth) acryloyloxy group, and 4 mol or more of ethylene is added to 1 mol of bisphenol A. Examples thereof include di (meth) acrylate in which two hydroxyl groups of the diol obtained by adding oxide or propylene oxide are substituted with a (meth) acryloyloxy group.

Specific examples of the trifunctional (meth) acrylate include trimethylolpropane tri (meth) acrylate, glycerin triacrylate, pentaerythritol tri (meth) acrylate, and trimethylolpropane to which 1 mol of ethylene oxide or propylene oxide is added. Examples thereof include tri (meth) acrylate in which the three hydroxyl groups of the resulting triol are substituted with a (meth) acryloyloxy group.

Specific examples of the tetrafunctional (meth) acrylate include pentaerythritol tetra (meth) acrylate.

Specific examples of the pentafunctional (meth) acrylate include dipentaerythritol penta (meth) acrylate.

Specific examples of the hexafunctional (meth) acrylate include dipentaerythritol hexa (meth) acrylate.

The polyfunctional (meth) acrylate may be a poly (meth) acrylate in which a plurality of hydroxyl groups of dipentaerythritol such as dipentaerythritol hexa (meth) acrylate are substituted with (meth) acryloyloxy groups.

The (meth) acrylate compound may be an ethylene oxide-modified phosphoric acid (meth) acrylate, an ethylene oxide-modified alkyl phosphoric acid (meth) acrylate, or the like, which has a phosphoric acid group.

Examples of the photocationically polymerizable compound include an epoxy compound, an oxetane compound, a vinyl ether compound and the like.

Examples of the epoxy compound include aliphatic epoxy compounds such as bisphenol A type epoxy compound, bisphenol F type epoxy compound, phenol novolac type epoxy compound, trimethylolpropane polyglycidyl ether, and neopentyl glycol diglycidyl ether, 1,2-epoxy-. Examples thereof include alicyclic epoxy compounds such as 4-vinylcyclohexane and 1-methyl-4- (2-methyloxylanyl) -7-oxabicyclo [4.1.0] heptane.

It is also possible to use a commercially available product as the epoxy compound. As commercially available epoxy compounds, for example, "Selokiside 2000", "Selokiside 3000" and "Selokiside 4000" manufactured by Daicel Chemical Industries, Ltd. can be used.

Examples of the cationically polymerizable oxetane compound include 2-ethylhexyl oxetane, 3-hydroxymethyl-3-methyloxetane, 3-hydroxymethyl-3-ethyloxetane, 3-hydroxymethyl-3-propyloxetane, and 3-hydroxymethyl-3. -Normal butyl oxetane, 3-hydroxymethyl-3-phenyloxetane, 3-hydroxymethyl-3-benzyloxetane, 3-hydroxyethyl-3-methyloxetane, 3-hydroxyethyl-3-ethyloxetane, 3-hydroxyethyl- 3-propyl oxetane, 3-hydroxyethyl-3-phenyloxetane, 3-hydroxypropyl-3-methyloxetane, 3-hydroxypropyl-3-ethyloxetane, 3-hydroxypropyl-3-propyloxetane, 3-hydroxypropyl- Examples thereof include 3-phenyloxetane and 3-hydroxybutyl-3-methyloxetane.

It is also possible to use a commercially available product as an oxetane compound. Examples of commercially available oxetane compounds include Aron oxetane series manufactured by Toa Synthetic Co., Ltd. (“OXT-101”, “OXT-212”, “OXT-121”, “OXT-221”, etc.); "Serokiside 2021", "Serokiside 2021A", "Serokiside 2021P", "Serokiside 2080", "Serokiside 2081", "Serokiside 2083", "Serokiside 2085", "Eporide GT300", "Eporide GT301", manufactured by Selokiside Co., Ltd. "Epolide GT302", "Epolide GT400", "Epolide GT401" and "Epolide GT403"; "Cyracure UVR-6105", "Cyracure UVR-6107", "Cyracure UVR-6110", manufactured by Dow Chemical Japan Co., Ltd. "Cyracure UVR-6128", "ERL4289", "ERL4299" and the like can be used. Further, a known oxetane compound (for example, the oxetane compound described in JP-A-2009-40830) can also be used.

Examples of the vinyl ether compound include 2-hydroxyethyl vinyl ether, triethylene glycol vinyl monoether, tetraethylene glycol divinyl ether, trimethylolpropane trivinyl ether and the like.

Further, as the photopolymerizable compound in the present embodiment, the photopolymerizable compound described in paragraphs 0042 to 0049 of JP2013-182215A can also be used.

In the ink composition of the present embodiment, when the curable component is composed of only the photopolymerizable compound or the main component thereof, the photopolymerizable compound as described above contains a polymerizable functional group in one molecule. It is more preferable to use a bifunctional or higher polyfunctional photopolymerizable compound having 2 or more as an essential component because the durability (strength, heat resistance, etc.) of the cured product can be further enhanced.

The photopolymerizable compound may be alkali-insoluble from the viewpoint that a highly reliable color filter pixel portion can be easily obtained. In the present specification, the fact that the photopolymerizable compound is alkali-insoluble means that the amount of the photopolymerizable compound dissolved in 1% by mass of a potassium hydroxide aqueous solution at 25 ° C. is 30 based on the total mass of the photopolymerizable compound. It means that it is less than mass%. The dissolved amount of the photopolymerizable compound is preferably 10% by mass or less, more preferably 3% by mass or less.

The content of the photopolymerizable compound is from the viewpoint that an appropriate viscosity can be easily obtained as an inkjet ink, from the viewpoint of improving the curability of the ink composition, and the solvent resistance of the pixel portion (cured product of the ink composition). From the viewpoint of improving the wear resistance, it may be 10% by mass or more, 15% by mass or more, or 20% by mass or more based on the mass of the non-volatile content of the ink composition. The content of the photopolymerizable compound is based on the mass of the non-volatile content of the ink composition from the viewpoint of easily obtaining an appropriate viscosity as an inkjet ink and from the viewpoint of obtaining more excellent optical characteristics (leakage light). It may be 90% by mass or less, 80% by mass or less, 70% by mass or less, 60% by mass or less, or 50% by mass or less.

The photopolymerizable compound has a crosslinkable group from the viewpoint of excellent stability of the pixel portion (cured product of the ink composition) (for example, deterioration over time can be suppressed, and high temperature storage stability and moist heat storage stability are excellent). You may be doing it. The crosslinkable group is a functional group that reacts with another crosslinkable group by heat or active energy rays (for example, ultraviolet rays), and is, for example, an epoxy group, an oxetane group, a vinyl group, an acryloyl group, an acryloyloxy group, a vinyl ether group, or the like. Can be mentioned.

[Photo-radical polymerization initiator]
As the photoradical polymerization initiator, a molecular cleavage type or hydrogen abstraction type photoradical polymerization initiator is suitable.

Examples of the molecular cleavage type photoradical polymerization initiator include benzoin isobutyl ether, 2,4-diethylthioxanthone, 2-isopropylthioxanthone, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, and 2-benzyl-2-dimethylamino-. 1- (4-morpholinophenyl) -butane-1-one, bis (2,6-dimethoxybenzoyl) -2,4,4-trimethylpentylphosphine oxide, (2,4,6-trimethylbenzoyl) ethoxyphenyl Phosphine oxide and the like are preferably used. Other molecular cleavage type photoradical polymerization initiators include 1-hydroxycyclohexylphenylketone, benzoinethyl ether, benzyldimethylketal, 2-hydroxy-2-methyl-1-phenylpropane-1-one, 1- (4). -Isopropylphenyl) -2-hydroxy-2-methylpropane-1-one and 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropane-1-one may be used in combination.

Examples of the hydrogen abstraction type photoradical polymerization initiator include benzophenone, 4-phenylbenzophenone, isophthalphenone, 4-benzoyl-4'-methyl-diphenylsulfide and the like. A molecular cleavage type photoradical polymerization initiator and a hydrogen abstraction type photoradical polymerization initiator may be used in combination.

[Photocationic polymerization initiator]
Examples of the photocationic polymerization initiator include polyarylsulfonium salts such as triphenylsulfonium hexafluoroantimonate and triphenylsulfonium hexafluorophosphate; diphenyliodonium hexafluoroantimonate and P-nonylphenyliodonium hexafluoroantimonate. Examples thereof include polyaryliodonium salts such as nate.

Commercially available products can also be used as the photocationic polymerization initiator. Commercially available products include sulfonium salt-based photocationic polymerization initiators such as "CPI-100P" manufactured by San-Apro, acylphosphine oxide compounds such as "Lucirin TPO" manufactured by BASF, and "Irgacure 907" manufactured by BASF. Examples thereof include "Irgacure 819", "Irgacure 379EG", ", Irgacure 184" and "Irgacure PAG290".

The content of the photopolymerization initiator may be 0.1 part by mass or more and 0.5 part by mass or more with respect to 100 parts by mass of the photopolymerizable compound from the viewpoint of curability of the ink composition. It may be 1 part by mass or more. The content of the photopolymerization initiator may be 40 parts by mass or less, and 30 parts by mass with respect to 100 parts by mass of the photopolymerizable compound, from the viewpoint of stability over time of the pixel portion (cured product of the ink composition). It may be less than or equal to 20 parts by mass or less.

[Thermosetting resin]
In the present embodiment, the thermosetting resin is a resin that functions as a binder in a cured product and is crosslinked and cured by heat. Thermosetting resins have curable groups. Examples of the curable group include an epoxy group, an oxetane group, an isocyanate group, an amino group, a carboxyl group, a methylol group, etc. For example, an epoxy group is preferable from the viewpoint of excellent adhesion to a black matrix) and a substrate. The thermosetting resin may have one kind of curable group or may have two or more kinds of curable groups.

Among the thermosetting resins, a resin having photoradical polymerizable property (polymerized by irradiation with light when used together with a photoradical polymerization initiator) and a photocationic polymerizable resin (photocationic polymerization). Contains resins (polymerized by light irradiation when used with initiators). When the ink composition contains a thermosetting resin having photoradical polymerizable property and a photoradical polymerization initiator, the thermosetting resin having photoradical polymerizable property becomes a photoradical polymerizable compound (photopolymerizable compound). It shall be classified. When the ink composition contains a photocationically polymerizable thermosetting resin and a photocationic polymerization initiator, the photocationically polymerizable thermosetting resin becomes a photocationically polymerizable compound (photopolymerizable compound). It shall be classified.

The thermosetting resin may be a polymer (homopolymer) of a single monomer, or may be a copolymer (copolymer) of a plurality of types of monomers. Further, the thermosetting resin may be any of a random copolymer, a block copolymer or a graft copolymer.

As the thermosetting resin, a compound having two or more thermosetting functional groups in one molecule is used, and it is usually used in combination with a curing agent. When a thermosetting resin is used, a catalyst (curing accelerator) capable of accelerating the thermosetting reaction may be further added. In other words, the ink composition may contain a thermosetting component including a thermosetting resin (as well as a curing agent and a curing accelerator used as needed). In addition to these, a polymer that does not have a polymerization reactivity by itself may be further used.

As the compound having two or more thermosetting functional groups in one molecule, for example, an epoxy resin having two or more epoxy groups in one molecule (hereinafter, also referred to as “polyfunctional epoxy resin”) may be used. The "epoxy resin" includes both a monomeric epoxy resin and a polymer epoxy resin. The number of epoxy groups contained in one molecule of the polyfunctional epoxy resin is preferably 2 to 50, more preferably 2 to 20. The epoxy group may be any structure as long as it has an oxylan ring structure, and may be, for example, a glycidyl group, an oxyethylene group, an epoxycyclohexyl group, or the like. Examples of the epoxy resin include known polyvalent epoxy resins that can be cured by a carboxylic acid. Such epoxy resins are widely disclosed in, for example, "Epoxy Resin Handbook" edited by Masaki Shinbo, published by Nikkan Kogyo Shimbun (1987), and these can be used.

Examples of the thermosetting resin having an epoxy group (including a polyfunctional epoxy resin) include a polymer of a monomer having an oxylan ring structure and a copolymer of a monomer having an oxylan ring structure and another monomer. Specific examples of the polyfunctional epoxy resin include polyglycidyl methacrylate, methyl methacrylate-glycidyl methacrylate copolymer, benzyl methacrylate-glycidyl methacrylate copolymer, n-butyl methacrylate-glycidyl methacrylate copolymer, and 2-hydroxyethyl methacrylate-glycidyl. Examples thereof include a methacrylate copolymer, a (3-ethyl-3-oxetanyl) methyl methacrylate-glycidyl methacrylate copolymer, and a styrene-glycidyl methacrylate. Further, as the thermosetting resin of the present embodiment, the compounds described in paragraphs 0044 to 0066 of JP-A-2014-56248 can also be used.

Examples of the polyfunctional epoxy resin include bisphenol A type epoxy resin, bisphenol F type epoxy resin, brominated bisphenol A type epoxy resin, bisphenol S type epoxy resin, diphenyl ether type epoxy resin, hydroquinone type epoxy resin, and naphthalene type epoxy. Resin, biphenyl type epoxy resin, fluorene type epoxy resin, phenol novolac type epoxy resin, orthocresol novolac type epoxy resin, trishydroxyphenylmethane type epoxy resin, trifunctional epoxy resin, tetraphenylol ethane type epoxy resin, dicyclopentadiene Phenolic type epoxy resin, hydrogenated bisphenol A type epoxy resin, bisphenol A nucleated polyol type epoxy resin, polypropylene glycol type epoxy resin, glycidyl ester type epoxy resin, glycidylamine type epoxy resin, glioxal type epoxy resin, alicyclic epoxy resin , A heterocyclic epoxy resin, etc. can be used.

More specifically, a bisphenol A type epoxy resin such as the product name "Epicoat 828" (manufactured by Japan Epoxy Resin), a bisphenol F type epoxy resin such as the product name "YDF-175S" (manufactured by Toto Kasei Co., Ltd.), and a product name. Brominated bisphenol A type epoxy resin such as "YDB-715" (manufactured by Toto Kasei Co., Ltd.), bisphenol S type epoxy resin such as trade name "EPICLON EXA1514" (manufactured by DIC Co., Ltd.), trade name "YDC-1312" ( Hydroquinone type epoxy resin such as Toto Kasei Co., Ltd.), Naphthalene type epoxy resin such as trade names "EPICLON EXA4032", "HP-4770", "HP-4700", "HP-5000" (manufactured by DIC Co., Ltd.), Biphenyl type epoxy resin such as product name "Epicoat YX4000H" (manufactured by Japan Epoxy Resin), bisphenol A type novolak epoxy resin such as product name "Epicoat 157S70" (manufactured by Japan Epoxy Resin), product name "Epicoat 154" (manufactured by Japan Epoxy Resin) Japan Epoxy Resin), phenol novolac type epoxy resin such as product name "YDPN-638" (Toto Kasei Co., Ltd.), cresol novolak type epoxy resin such as product name "YDCN-701" (Toto Kasei Co., Ltd.), product Dicyclopentadienephenol type epoxy resin such as the names "EPICLON HP-7200" and "HP-7200H" (manufactured by DIC Co., Ltd.), and trishydroxyphenylmethane type such as the trade name "Epicoat 1032H60" (manufactured by Japan Epoxy Resin). Epoxy resin, trifunctional epoxy resin such as trade name "VG3101M80" (manufactured by Mitsui Kagaku Co., Ltd.), tetraphenylol ethane type epoxy resin such as trade name "Epicoat 1031S" (manufactured by Japan Epoxy Resin), trade name "Denacol EX" 4-functional epoxy resin such as "-411" (manufactured by Nagase Kasei Kogyo Co., Ltd.), hydrogenated bisphenol A type epoxy resin such as trade name "ST-3000" (manufactured by Toto Kasei Co., Ltd.), trade name "Epicoat 190P" (Japan Epoxy) Glycidyl ester type epoxy resin such as resin), glycidylamine type epoxy resin such as trade name "YH-434" (manufactured by Toto Kasei Co., Ltd.), glioxal type such as trade name "YDG-414" (manufactured by Toto Kasei Co., Ltd.) Epoxy resin, alicyclic polyfunctional epoxy compound such as trade name "Epolide GT-401" (manufactured by Daicel Chemical Co., Ltd.), triglycidyl isocyanate (TGI) Examples thereof include heterocyclic epoxy resins such as C). Further, if necessary, the trade name "Neo Tote E" (manufactured by Toto Kasei Co., Ltd.) or the like can be mixed as the epoxy reactive diluent.

The polyfunctional epoxy resins include "Findick A-247S", "Findick A-254", "Findick A-253", "Findick A-229-30A", and "Findick A-229-30A" manufactured by DIC Corporation. "Findick A-261", "Findick A249", "Findick A-266", "Findick A-241", "Findick M-8020", "Epoxy N-740", "Epoxy N-770", "Epoxylon N-865" (trade name) or the like can be used.

When a polyfunctional epoxy resin having a relatively small molecular weight is used as the thermosetting resin, the epoxy group is replenished in the ink composition (inkjet ink), the reaction point concentration of the epoxy becomes high, and the crosslink density can be increased. can.

Among the polyfunctional epoxy resins, it is preferable to use an epoxy resin having four or more epoxy groups in one molecule (polyfunctional epoxy resin having four or more functional groups) from the viewpoint of increasing the crosslink density. In particular, when a thermosetting resin having a weight average molecular weight of 10,000 or less is used in order to improve the ejection stability from the ejection head in the inkjet method, the strength and hardness of the pixel portion (cured product of the ink composition) are lowered. From the viewpoint of sufficiently increasing the crosslink density, it is preferable to add a polyfunctional epoxy resin having four or more functionalities to the ink composition (inkjet ink).

Examples of the curing agent and curing accelerator used for curing the thermosetting resin include 4-methylhexahydrophthalic anhydride, triethylenetetramine, diaminodiphenylmethane, phenol novolac resin, and tris (dimethylaminomethyl) phenol. , N, N-dimethylbenzylamine, 2-ethyl-4-methylimidazole, triphenylphosphine, 3-phenyl-1,1-dimethylurea and the like.

The thermosetting resin may be alkali-insoluble from the viewpoint that a color filter pixel portion having excellent reliability can be easily obtained. When the thermosetting resin is alkali-insoluble, the amount of the thermosetting resin dissolved at 25 ° C. in a 1% by mass potassium hydroxide aqueous solution is 30% by mass or less based on the total mass of the thermosetting resin. Means that. The dissolved amount of the thermosetting resin is preferably 10% by mass or less, and more preferably 3% by mass or less.

The weight average molecular weight of the thermosetting resin is from the viewpoint that an appropriate viscosity can be easily obtained as an inkjet ink, from the viewpoint of improving the curability of the ink composition, and the solvent resistance of the pixel portion (cured product of the ink composition). And from the viewpoint of improving the wear resistance, it may be 750 or more, 1000 or more, or 2000 or more. From the viewpoint of obtaining an appropriate viscosity as an inkjet ink, it may be 500,000 or less, 300,000 or less, or 200,000 or less. However, this does not apply to the molecular weight after cross-linking.

The content of the thermosetting resin is from the viewpoint that an appropriate viscosity can be easily obtained as an inkjet ink, from the viewpoint of improving the curability of the ink composition, and the solvent resistance of the pixel portion (cured product of the ink composition). From the viewpoint of improving the wear resistance, it may be 10% by mass or more, 15% by mass or more, or 20% by mass or more based on the mass of the non-volatile content of the ink composition. The content of the thermosetting resin is based on the mass of the non-volatile content of the ink composition from the viewpoint that the viscosity of the inkjet ink does not become too high and the thickness of the pixel portion does not become too thick for the light conversion function. It may be 90% by mass or less, 80% by mass or less, 70% by mass or less, 60% by mass or less, or 50% by mass or less.

In the present embodiment, the ink composition may contain at least one of the photopolymerizable compound and the thermosetting resin, and may contain both the photopolymerizable compound and the thermosetting resin. .. When the ink composition contains a photopolymerizable compound, it does not have to contain a thermosetting resin. Further, when the ink composition contains a thermosetting resin, it does not have to contain a photopolymerizable compound. A photopolymerizable compound from the viewpoint of storage stability of an ink composition containing luminescent nanocrystal particles (for example, quantum dots) and durability (wet and thermosetting stability, etc.) of a pixel portion (cured product of the ink composition). Of the thermosetting resins, it is preferable to use a thermosetting resin, and the storage stability of the ink composition containing luminescent nanocrystal particles (for example, quantum dots) and the low temperature which is not easily deteriorated by heating of the quantum dots. It is more preferable to use a photoradical polymerizable compound from the viewpoint of being able to be cured in, and from the viewpoint of being able to form a pixel portion (cured product of an ink composition) without being hindered by oxygen in the curing process, photocationic polymerization is possible. It is preferable to use a sex compound.

When the ink composition contains a photopolymerizable compound and a thermosetting resin, the total content of the photopolymerizable compound and the thermosetting resin is the viewpoint that an appropriate viscosity for an inkjet ink can be easily obtained, and the ink composition is cured. From the viewpoint of improving the properties and improving the solvent resistance and abrasion resistance of the pixel portion (cured product of the ink composition), the content is 3% by mass or more based on the mass of the non-volatile content of the ink composition. It may be 5% by mass or more, 10% by mass or more, 15% by mass or more, or 20% by mass or more. Further, the total content of the photopolymerizable compound and the thermosetting resin is an ink composition from the viewpoint that the viscosity of the inkjet ink does not become too high and the thickness of the pixel portion does not become too thick for the light conversion function. It may be 80% by mass or less, 60% by mass or less, or 50% by mass or less based on the mass of the non-volatile content of the above.

The ink composition of the present embodiment can be applied as an ink used in a known and conventional method for producing a color filter, but without wasting materials such as luminescent nanocrystal particles and a solvent, which are relatively expensive. In that the color filter pixel part (optical conversion layer) can be formed only by using the required amount in the required place, it should be appropriately prepared and used so as to be more suitable for the inkjet method than for the photolithography method. preferable.

The viscosity of the ink composition may be, for example, 2 mPa · s or more, 5 mPa · s or more, or 7 mPa · s or more from the viewpoint of ejection stability during inkjet printing. The viscosity of the ink composition may be 20 mPa · s or less, 15 mPa · s or less, or 12 mPa · s or less. When the viscosity of the ink composition is 2 mPa · s or more, the meniscus shape of the ink composition at the tip of the ink ejection hole of the ejection head is stable, so that the ejection control of the ink composition (for example, the ejection amount and the ejection timing) Control) becomes easy. On the other hand, when the viscosity is 20 mPa · s or less, the ink composition can be smoothly ejected from the ink ejection holes. The viscosities of the ink composition are 2-20 mPa · s, 2-15 mPa · s, 2-12 mPa · s, 5-20 mPa · s, 5-15 mPa · 2-20 mPa · s, 7-15 mPa · s, 7-12 mPa. It may be s, s, or 7 to 12 mPa · s. The viscosity of the ink composition is measured, for example, by an E-type viscometer.

The surface tension of the ink composition is preferably a surface tension suitable for the inkjet method, specifically, preferably in the range of 20 to 40 mN / m, and more preferably 25 to 35 mN / m. .. By setting the surface tension within this range, the occurrence of flight bending can be suppressed. The flight bending means that when the ink composition is ejected from the ink ejection holes, the landing position of the ink composition deviates from the target position by 30 μm or more. When the surface tension is 40 mN / m or less, the meniscus shape at the tip of the ink ejection hole is stable, so that ejection control of the ink composition (for example, control of ejection amount and ejection timing) becomes easy. On the other hand, when the surface tension is 20 mN / m or less, the occurrence of flight bending can be suppressed. That is, a pixel portion may not be landed accurately on the pixel portion forming region to be landed, and the ink composition may be insufficiently filled, or a pixel portion forming region (or pixel portion) adjacent to the pixel portion forming region to be landed may be generated. The ink composition does not land on the surface and the color reproducibility does not deteriorate.

The ink composition includes light-emitting nanocrystal particles, light-scattering particles, photopolymerizable compounds, thermosetting resins, polymer dispersants, polymerization initiators, and organic ligands as long as the effects of the present invention are not impaired. It may further contain the component of. Examples of other components include sensitizers, solvents and the like.

[Sensitizer]
As the sensitizer, amines that do not cause an addition reaction with the photopolymerizable compound and the thermosetting resin can be used. Examples of the sensitizer include trimethylamine, methyldimethylamine, triethanolamine, p-diethylaminoacetophenone, ethyl p-dimethylaminobenzoate, isoamyl p-dimethylaminobenzoate, N, N-dimethylbenzylamine, 4, Examples thereof include 4'-bis (diethylamino) benzophenone.

[solvent]
Examples of the solvent include ethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol dibutyl ether, diethyl adipic acid, dibutyl oxalate, dimethyl malonate, diethyl malonate, dimethyl succinate, and diethyl succinate. , 1,4-Butane odium diacetate, glyceryl triacetate and the like.

The boiling point of the solvent is preferably 180 ° C. or higher from the viewpoint of continuous ejection stability of the inkjet ink. Further, since it is necessary to remove the solvent from the ink composition before curing the ink composition at the time of forming the pixel portion, the boiling point of the solvent is preferably 300 ° C. or lower from the viewpoint of easy removal of the solvent.

When a thermosetting resin is used and a photopolymerizable compound is not used, the color filter pixel portion (light) with less unevenness by improving the fluidity of the ink composition and the viewpoint of preparing the ink composition to be uniform. From the viewpoint of forming the conversion layer), it is preferable to use a solvent. On the other hand, when a photopolymerizable compound is used, it becomes possible to disperse light-scattering particles and luminescent nanocrystal particles in the photopolymerizable compound without using a solvent. In this case, there is an advantage that the step of removing the solvent by drying when forming the pixel portion becomes unnecessary.

Although one embodiment of the ink composition for a color filter has been described above, the ink composition of the above-described embodiment can be used, for example, by a photolithography method in addition to the inkjet method. In this case, the ink composition contains an alkali-soluble resin as the binder polymer.

When the ink composition is used in a photography method, the ink composition is first applied onto a substrate, and when the ink composition contains a solvent, the ink composition is further dried to form a coating film. The coating film thus obtained is soluble in an alkaline developer and is patterned by being treated with an alkaline developer. At this time, since the alkaline developer is mostly an aqueous solution from the viewpoint of ease of waste liquid treatment of the developer, the coating film of the ink composition is treated with the aqueous solution. On the other hand, in the case of an ink composition using luminescent nanocrystal particles (quantum dots or the like), the luminescent nanocrystal particles are unstable with respect to water, and the luminescence (for example, fluorescence) is impaired by water. Therefore, in this embodiment, an inkjet method that does not need to be treated with an alkaline developer (aqueous solution) is preferable.

Further, even when the coating film of the ink composition is not treated with an alkaline developer, when the ink composition is alkali-soluble, the coating film of the ink composition easily absorbs moisture in the atmosphere, and the time is long. As time passes, the luminescence (for example, fluorescence) of the luminescent nanocrystal particles (quantum dots, etc.) is impaired. From this point of view, in the present embodiment, the coating film of the ink composition is preferably alkali-insoluble. That is, the ink composition of the present embodiment is preferably an ink composition capable of forming an alkali-insoluble coating film. Such an ink composition can be obtained by using an alkali-insoluble photopolymerizable compound and / or an alkali-insoluble thermosetting resin as the photopolymerizable compound and / or the thermosetting resin. The fact that the coating film of the ink composition is alkaline insoluble means that the amount of the coating film of the ink composition dissolved at 25 ° C. in a 1% by mass potassium hydroxide aqueous solution is based on the total mass of the coating film of the ink composition. It means that it is 30% by mass or less. The dissolved amount of the coating film of the ink composition is preferably 10% by mass or less, and more preferably 3% by mass or less. The fact that the ink composition is an ink composition capable of forming an alkali-insoluble coating film means that after the ink composition is applied onto the substrate, it is dried at 80 ° C. for 3 minutes when it contains a solvent. It can be confirmed by measuring the above-mentioned dissolution amount of the obtained coating film having a thickness of 1 μm.

<Manufacturing method of ink composition>
Next, a method for producing the ink composition of the above-described embodiment will be described. The method for producing the ink composition includes, for example, a first step of preparing a dispersion of light-scattering particles containing a light-scattering particle and a polymer dispersant, and a dispersion of light-scattering particles and a luminescent nano. It comprises a second step of mixing the crystal particles. In this method, the dispersion of the light-scattering particles may further contain a photopolymerizable compound and / or a thermosetting resin, and in the second step, the photopolymerizable compound and / or the thermosetting. The resin may be further mixed. According to this method, the light scattering particles can be sufficiently dispersed. Therefore, it is possible to easily obtain an ink composition capable of reducing leakage light in the pixel portion.

In the step of preparing the dispersion of the light-scattering particles, the light-scattering particles, the polymer dispersant, and in some cases, the photopolymerizable compound and / or the thermosetting resin are mixed and dispersed. Thereby, a dispersion of light-scattering particles may be prepared. The mixing and dispersion treatment may be performed using a dispersion device such as a bead mill, a paint conditioner, or a planetary stirrer. It is preferable to use a bead mill or a paint conditioner from the viewpoint that the dispersibility of the light-scattering particles is good and the average particle size of the light-scattering particles can be easily adjusted to a desired range.

The method for producing an ink composition is to prepare a dispersion of luminescent nanocrystal particles containing luminescent nanocrystal particles, a photopolymerizable compound, and / or a thermosetting resin before the second step. It may be further provided with a step of preparing. In this case, in the second step, the dispersion of the light-scattering particles and the dispersion of the luminescent nanocrystal particles are mixed. According to this method, the luminescent nanocrystal particles can be sufficiently dispersed. Therefore, it is possible to easily obtain an ink composition capable of reducing leakage light in the pixel portion. In the step of preparing the dispersion of the luminescent nanocrystal particles, the luminescent nanocrystal particles, the photopolymerizable compound, and / or using the same dispersion device as in the step of preparing the dispersion of the light scattering particles. Mixing and dispersion treatment with a thermosetting resin may be performed.

When the ink composition of the present embodiment is used as an ink composition for an inkjet method, it is preferably applied to a piezojet type inkjet recording device having a mechanical ejection mechanism using a piezoelectric element. In the piezo jet method, the ink composition is not instantaneously exposed to a high temperature during ejection, deterioration of the luminescent nanocrystal particles is unlikely to occur, and the color filter pixel portion (light conversion layer) has the expected emission characteristics. Is easier to obtain.

<Optical conversion layer and color filter>
Next, the details of the light conversion layer and the color filter using the ink composition of the above-described embodiment will be described with reference to the drawings. In the following description, the same reference numerals will be used for the same or equivalent elements, and duplicate description will be omitted.

FIG. 1 is a schematic cross-sectional view of the color filter of one embodiment. As shown in FIG. 1, the color filter 100 includes a base material 40 and a light conversion layer 30 provided on the base material 40. The light conversion layer 30 includes a plurality of pixel units 10 and a light-shielding unit 20.

The optical conversion layer 30 has a first pixel unit 10a, a second pixel unit 10b, and a third pixel unit 10c as the pixel unit 10. The first pixel portion 10a, the second pixel portion 10b, and the third pixel portion 10c are arranged in a grid pattern so as to repeat in this order. The light-shielding portion 20 is located between adjacent pixel portions, that is, between the first pixel portion 10a and the second pixel portion 10b, between the second pixel portion 10b and the third pixel portion 10c, and the third. It is provided between the pixel portion 10c of the above and the first pixel portion 10a. In other words, these adjacent pixel portions are separated from each other by the light-shielding portion 20.

The first pixel portion 10a and the second pixel portion 10b each include a cured product of the ink composition of the above-described embodiment. The cured product contains luminescent nanocrystal particles, light-scattering particles, and a cured component. The curing component is a cured product of a photopolymerizable compound and / or a thermosetting resin, and specifically, a cured product obtained by polymerization of a photopolymerizable compound and / or crosslinking of a thermosetting resin. That is, the first pixel portion 10a contains the first curing component 13a and the first luminescent nanocrystal particles 11a and the first light scattering particles 12a dispersed in the first curing component 13a, respectively. include. Similarly, the second pixel portion 10b includes the second curing component 13b and the second luminescent nanocrystal particles 11b and the second light scattering particles 12b dispersed in the second curing component 13b, respectively. including. In the first pixel portion 10a and the second pixel portion 10b, the first curing component 13a and the second curing component 13b may be the same or different, and may be the same as or different from the first light scattering particles 12a. It may be the same as or different from the second light-scattering particle 12b.

The first luminescent nanocrystal particles 11a are red luminescent nanocrystal particles that absorb light having a wavelength in the range of 420 to 480 nm and emit light having a emission peak wavelength in the range of 605 to 665 nm. That is, the first pixel portion 10a may be paraphrased as a red pixel portion for converting blue light into red light. The second luminescent nanocrystal particle 11b is a green luminescent nanocrystal particle that absorbs light having a wavelength in the range of 420 to 480 nm and emits light having a emission peak wavelength in the range of 500 to 560 nm. That is, the second pixel portion 10b may be paraphrased as a green pixel portion for converting blue light into green light.

The content of the luminescent nanocrystal particles in the pixel portion containing the cured product of the ink composition is 5% by mass or more based on the total mass of the cured product of the ink composition from the viewpoint of being more excellent in the effect of reducing leakage light. It may be 10% by mass or more, 15% by mass or more, 20% by mass or more, 30% by mass or more, or 40% by mass or more. May be good. The content of the luminescent nanocrystal particles may be 70% by mass or less, or 60% by mass or less, based on the total mass of the cured product of the ink composition from the viewpoint of excellent reliability of the pixel portion. It may be 55% by mass or less, or 50% by mass or less.

The content of the light-scattering particles in the pixel portion containing the cured product of the ink composition is 0.1% by mass or more based on the total mass of the cured product of the ink composition from the viewpoint of being more excellent in the effect of reducing leakage light. It may be 1% by mass or more, 5% by mass or more, 7% by mass or more, 10% by mass or more, or 12% by mass or more. You may. The content of the light-scattering particles may be 60% by mass or less based on the total mass of the cured product of the ink composition from the viewpoint of excellent effect of reducing leakage light and excellent reliability of the pixel portion. It may be 50% by mass or less, 40% by mass or less, 30% by mass or less, 25% by mass or less, or 20% by mass or less. It may be 15% by mass or less. The content of the light-scattering particles is 0.1 to 60% by mass, 0.1 to 50% by mass, 0.1 to 40% by mass, 0.1 to 1 based on the total mass of the cured product of the ink composition. 30% by mass, 0.1 to 25% by mass, 0.1 to 20% by mass, 0.1 to 15% by mass, 1 to 60% by mass, 1 to 50% by mass, 1 to 40% by mass, 1 to 30% by mass. %, 1-25% by mass, 1-20% by mass, 1-15% by mass, 5-60% by mass, 5-50% by mass, 5-40% by mass, 5-30% by mass, 5-25% by mass, 5 to 20% by mass, 5 to 15% by mass, 7 to 60% by mass, 7 to 50% by mass, 7 to 40% by mass, 7 to 30% by mass, 7 to 25% by mass, 7 to 20% by mass, 7 to 15% by mass, 10-60% by mass, 10-50% by mass, 10-40% by mass, 10-30% by mass, 10-25% by mass, 10-20% by mass, 10-15% by mass, 12-60% by mass %, 12-50% by mass, 12-40% by mass, 12-30% by mass, 12-25% by mass, 12-20% by mass, or 12-15% by mass.

The third pixel portion 10c has a transmittance of 30% or more with respect to light having a wavelength in the range of 420 to 480 nm. Therefore, the third pixel unit 10c functions as a blue pixel unit when a light source that emits light having a wavelength in the range of 420 to 480 nm is used. The third pixel portion 10c contains, for example, a cured product of a composition containing the above-mentioned photopolymerizable compound and / or a thermosetting resin. The cured product contains a third cured component 13c. The third curing component 13c is a cured product of a photopolymerizable compound and / or a thermosetting resin, and specifically, a cured product obtained by polymerizing the photopolymerizable compound and / or cross-linking the thermosetting resin. Is. That is, the third pixel portion 10c contains the third curing component 13c. When the third pixel portion 10c contains the above-mentioned cured product, the composition containing the photopolymerizable compound and / or the thermosetting resin has a transmission rate of 30% for light having a wavelength in the range of 420 to 480 nm. As long as it is as described above, among the components contained in the above-mentioned ink composition, components other than the photopolymerizable compound and the thermosetting resin may be further contained. The transmittance of the third pixel unit 10c can be measured by a microspectroscopy device.

The thickness of the pixel portion (first pixel portion 10a, second pixel portion 10b, and third pixel portion 10c) may be, for example, 1 μm or more, 2 μm or more, or 3 μm or more. You may. The thickness of the pixel portion (first pixel portion 10a, second pixel portion 10b, and third pixel portion 10c) may be, for example, 30 μm or less, 20 μm or less, or 15 μm or less. You may.

The light-shielding portion 20 is a so-called black matrix provided for the purpose of separating adjacent pixel portions to prevent color mixing and for the purpose of preventing light leakage from a light source. The material constituting the light-shielding portion 20 is not particularly limited, and the curing of the resin composition containing light-shielding particles such as carbon fine particles, metal oxides, inorganic pigments, and organic pigments in the binder polymer in addition to a metal such as chromium. Objects and the like can be used. The binder polymer used here includes one or a mixture of two or more resins such as polyimide resin, acrylic resin, epoxy resin, polyacrylamide, polyvinyl alcohol, gelatin, casein, and cellulose, photosensitive resin, and O / W. An emulsion-type resin composition (for example, an emulsion of reactive silicone) or the like can be used. The thickness of the light-shielding portion 20 may be, for example, 0.5 μm or more, and may be 10 μm or less.

The base material 40 is a transparent base material having light transmission, and is, for example, a transparent glass substrate such as quartz glass, Pylex (registered trademark) glass, a synthetic quartz plate, a transparent resin film, an optical resin film, or the like. A flexible base material or the like can be used. Among these, it is preferable to use a glass substrate made of non-alkali glass that does not contain an alkaline component in the glass. Specifically, "7059 glass", "1737 glass", "Eagle 200" and "Eagle XG" manufactured by Corning Inc., "AN100" manufactured by Asahi Glass Co., Ltd., "OA-10G" and "OA-10G" manufactured by Nippon Electric Glass Co., Ltd. OA-11 "is suitable. These are materials with a small coefficient of thermal expansion and are excellent in dimensional stability and workability in high temperature heat treatment.

The color filter 100 provided with the above optical conversion layer 30 is suitably used when a light source that emits light having a wavelength in the range of 420 to 480 nm is used.

In the color filter 100, for example, after the light-shielding portion 20 is formed in a pattern on the base material 40, the ink composition of the above-described embodiment is formed in the pixel portion-forming region partitioned by the light-shielding portion 20 on the base material 40. Inkjet ink) can be selectively adhered by an inkjet method, and the ink composition can be cured by irradiation with active energy rays or heating.

The method of forming the light-shielding portion 20 is to form a metal thin film such as chromium or a thin film of a resin composition containing light-shielding particles in a region serving as a boundary between a plurality of pixel portions on one surface side of the base material 40. However, a method of patterning this thin film and the like can be mentioned. The metal thin film can be formed by, for example, a sputtering method, a vacuum vapor deposition method, or the like, and the thin film of the resin composition containing the light-shielding particles can be formed, for example, by a method such as coating or printing. Examples of the method for patterning include a photolithography method and the like.

Examples of the inkjet method include a bubble jet (registered trademark) method using an electric heat converter as an energy generating element, a piezojet method using a piezoelectric element, and the like.

When the ink composition is cured by irradiation with active energy rays (for example, ultraviolet rays), for example, a mercury lamp, a metal halide lamp, a xenon lamp, an LED or the like may be used. The wavelength of the light to be irradiated may be, for example, 200 nm or more, and may be 440 nm or less. The exposure amount may be, for example, 10 mJ / cm ² or more, and may be 4000 mJ / cm ^{2 or less.}

When the ink composition is cured by heating, the heating temperature may be, for example, 110 ° C. or higher, and may be 250 ° C. or lower. The heating time may be, for example, 10 minutes or more, and may be 120 minutes or less.

Although the color filter, the optical conversion layer, and one embodiment of these manufacturing methods have been described above, the present invention is not limited to the above embodiment.

For example, the optical conversion layer is a pixel portion containing a cured product of an ink composition containing blue-emitting nanocrystal particles in place of the third pixel portion 10c or in addition to the third pixel portion 10c ( It may be provided with a blue pixel portion). Further, the light conversion layer may include a pixel portion (for example, a yellow pixel portion) containing a cured product of an ink composition containing nanocrystal particles that emit light of a color other than red, green, and blue. In these cases, it is preferable that each of the luminescent nanocrystal particles contained in each pixel portion of the optical conversion layer has an absorption maximum wavelength in the same wavelength range.

Further, at least a part of the pixel portion of the light conversion layer may contain a cured product of a composition containing a pigment other than the luminescent nanocrystal particles.

Further, the color filter may include an ink-repellent layer made of a material having an ink-repellent property narrower than that of the light-shielding portion on the pattern of the light-shielding portion. Further, instead of providing an ink-repellent layer, a photocatalyst-containing layer as a wettability variable layer is formed in a solid coating shape in a region including a pixel portion forming region, and then light is applied to the photocatalyst-containing layer via a photomask. Irradiation may be performed for exposure to selectively increase the parental ink property of the pixel portion forming region. Examples of the photocatalyst include titanium oxide.

Further, the color filter may be provided with an ink receiving layer containing hydroxypropyl cellulose or the like between the base material and the pixel portion.

Further, the color filter may be provided with a protective layer on the pixel portion. This protective layer flattens the color filter and prevents the components contained in the pixel portion, or the components contained in the pixel portion and the components contained in the photocatalyst-containing layer from elution into the liquid crystal layer. It is provided. As the material constituting the protective layer, a material used as a known protective layer for a color filter can be used.

Further, in the manufacture of the color filter and the optical conversion layer, the pixel portion may be formed by a photolithography method instead of the inkjet method. In this case, first, the ink composition is coated on the base material in a layered manner to form an ink composition layer. Next, the ink composition layer is exposed in a pattern and then developed using a developing solution. In this way, a pixel portion made of a cured product of the ink composition is formed. Since the developer is usually alkaline, an alkali-soluble polymer is used as the binder polymer. However, in terms of material usage efficiency, the inkjet method is superior to the photolithography method. This is because, in principle, the photolithography method removes about two-thirds or more of the material, and the material is wasted. Therefore, in the present embodiment, it is preferable to use an inkjet ink and form a pixel portion by an inkjet method.

Further, in addition to the above-mentioned luminescent nanocrystal particles, the pixel portion of the light conversion layer of the present embodiment may further contain a pigment having substantially the same color as the luminescent color of the luminescent nanocrystal particles. For example, when a pixel portion containing luminescent nanocrystal particles that absorb and emit blue light is used as the pixel portion of the liquid crystal display element, the light from the light source is blue light or semi-white light having a peak at 450 nm. However, if the concentration of the luminescent nanocrystal particles in the pixel portion is not sufficient, the light from the light source passes through the light conversion layer when the liquid crystal display element is driven. The transmitted light (blue light, leaked light) from this light source and the light emitted by the luminescent nanocrystal particles are mixed. From the viewpoint of preventing deterioration of color reproducibility due to the occurrence of such color mixing, a pigment may be contained in the pixel portion of the optical conversion layer. In order to contain the pigment in the pixel portion, the pigment may be contained in the ink composition.

Further, one or two of the red pixel portion (R), the green pixel portion (G), and the blue pixel portion (B) in the optical conversion layer of the present embodiment do not contain luminescent nanocrystal particles. It may be a pixel portion containing a coloring material. As the color material that can be used here, a known color material can be used. For example, as the color material used for the red pixel portion (R), a diketopyrrolopyrrole pigment and / or an anionic red organic dye is used. Can be mentioned. Examples of the coloring material used for the green pixel portion (G) include at least one selected from the group consisting of a halogenated copper phthalocyanine pigment, a phthalocyanine-based green dye, and a mixture of a phthalocyanine-based blue dye and an azo-based yellow organic dye. Examples of the coloring material used for the blue pixel portion (B) include an ε-type copper phthalosine pigment and / or a cationic blue organic dye. The amount of these coloring materials used is 1 to 5 mass based on the total mass of the pixel portion (cured product of the ink composition) from the viewpoint of preventing a decrease in transmittance when contained in the optical conversion layer. % Is preferable.

Hereinafter, the present invention will be specifically described with reference to Examples. However, the present invention is not limited to the following examples.

In the examples and comparative examples, the following materials were used.
[Luminescent nanocrystal particles]
QD dispersion 1: 767785
(Product number manufactured by SIGMA-ALDRICH, QD composition: InP / ZnS, QD emission peak wavelength λem: 650 nm, QD content: 5 mg / mL, toluene solution)
QD dispersion 2: 767750
(Product number manufactured by SIGMA-ALDRICH, QD composition: InP / ZnS, QD emission peak wavelength λem: 530 nm, QD content: 5 mg / mL, toluene solution)
[Light scattering particles]
-Titanium oxide: JR-806 (trade name manufactured by TAYCA Corporation, average particle size (volume average diameter): 300 nm)
[Photopolymerizable compound]
-Alicyclic epoxy monomer: Celoxide 2000 (trade name manufactured by Daicel Co., Ltd., "Selokiside" is a registered trademark)
-Oxetane Monomer: Aron Oxetane OXT-212 (trade name manufactured by Toagosei Co., Ltd., "Aron Oxetane" is a registered trademark)
[Polymer dispersant]
-Polymer dispersant: DISPERBYK-2155 (trade name manufactured by BYK, "DISPERBYK" is a registered trademark)
[Polymerization initiator]
-Photocationic polymerization initiator: CPI-100P (trade name manufactured by Sun Apro Co., Ltd., "CPI" is a registered trademark)

<Preparation of QD / alicyclic epoxy monomer dispersion>
(Preparation Example 1)
After mixing 400 mL of QD dispersion liquid 1 and 8 g of alicyclic epoxy monomer, the toluene derived from the QD dispersion liquid is removed by an evaporator to remove the toluene derived from the QD dispersion liquid, whereby the QD / alicyclic epoxy monomer dispersion 1 (of QD). Content: 20% by mass) was obtained.

(Preparation Example 2)
After mixing 600 mL of the QD dispersion liquid 1 and 7 g of the alicyclic epoxy monomer, the toluene derived from the QD dispersion liquid is removed by an evaporator to remove the toluene derived from the QD dispersion liquid, whereby the QD / alicyclic epoxy monomer dispersion 2 (QD). Content: 30% by mass) was obtained.

(Preparation Example 3)
A QD / alicyclic epoxy monomer dispersion 3 (QD content: 20% by mass) was obtained in the same manner as in Preparation Example 1 except that the QD dispersion 2 was used instead of the QD dispersion 1.

<Preparation of light-scattering particle dispersion>
(Preparation Example 4)
1.29 g of titanium oxide, 0.13 g of a polymer dispersant, and 1.81 g of an oxetane monomer were blended. Zirconia beads (diameter: 5 mm) were added to the obtained formulation, and then the mixture was shaken for 2 hours using a paint conditioner to disperse the formulation. As a result, a light-scattering particle dispersion 1 was obtained.

(Preparation Example 5)
1.96 g of titanium oxide, 0.20 g of a polymer dispersant, and 1.11 g of an oxetane monomer were blended. Zirconia beads (diameter: 5 mm) were added to the obtained formulation, and then the mixture was shaken for 2 hours using a paint conditioner to disperse the formulation. As a result, a light-scattering particle dispersion 2 was obtained.

(Preparation Example 6)
2.34 g of titanium oxide, 0.23 g of a polymer dispersant, and 1.23 g of an oxetane monomer were blended. Zirconia beads (diameter: 5 mm) were added to the obtained formulation, and then the mixture was shaken for 2 hours using a paint conditioner to disperse the formulation. As a result, a light-scattering particle dispersion 3 was obtained.

(Preparation Example 7)
1.06 g of titanium oxide, 0.11 g of a polymer dispersant, and 1.49 g of an oxetane monomer were blended. Zirconia beads (diameter: 5 mm) were added to the obtained formulation, and then the mixture was shaken for 2 hours using a paint conditioner to disperse the formulation. As a result, a light-scattering particle dispersion 4 was obtained.

(Preparation Example 8)
2.90 g of titanium oxide, 0.29 g of a polymer dispersant, and 1.65 g of an oxetane monomer were blended. Zirconia beads (diameter: 5 mm) were added to the obtained formulation, and then the mixture was shaken for 2 hours using a paint conditioner to disperse the formulation. As a result, a light-scattering particle dispersion 5 was obtained.

(Preparation Example 9)
0.11 g of titanium oxide, 0.01 of a polymer dispersant, and 2.54 g of an oxetane monomer were blended. Zirconia beads (diameter: 5 mm) were added to the obtained formulation, and then the mixture was shaken for 2 hours using a paint conditioner to disperse the formulation. As a result, a light-scattering particle dispersion 6 was obtained.

(Example 1)
(1) Preparation of Ink Composition (Ink Ink) QD / alicyclic epoxy monomer dispersion 1 is 6.47 g, photoscatterable particle dispersion 1 is 3.23 g, and photocationic polymerization initiator is 0.3 g. And then were mixed, and then the mixture was filtered through a filter having a pore size of 5 μm to obtain an ink composition.

(2) Preparation of Optical Conversion Filter The ink composition obtained in (1) above was applied onto a glass substrate (slide glass) with a spin coater so that the film thickness after drying was 5 μm. After the obtained film was dried, the dried film was irradiated with ultraviolet rays at an exposure amount of ^{2000 mJ / cm 2.} As a result, the ink composition was cured to form a layer (light conversion layer) made of the cured product of the ink composition on the glass substrate. An optical conversion filter was obtained by the above operation.

(3) Evaluation Using the ink composition obtained in (1) above and the optical conversion filter obtained in (2) above, leakage light evaluation and ejection stability evaluation were performed by the following procedure. The results are shown in Table 1.

[Evaluation of leaked light]
A blue LED (peak emission wavelength: 450 nm) manufactured by CCS Inc. was used as the surface emission light source. An optical conversion filter was installed on this light source with the glass substrate side facing down. An integrating sphere was connected to a radiation spectrophotometer (trade name "MCPD-9800") manufactured by Otsuka Electronics Co., Ltd., and the integrating sphere was brought close to the optical conversion filter installed on the blue LED. In this state, the blue LED was turned on and the peak intensity (S) of the observed light having a wavelength of 450 nm was measured. Next, light having a wavelength of 450 nm was observed in the same manner as in the above method except that the glass substrate (slide glass) used for producing the optical conversion filter was installed on the light source instead of the optical conversion filter. The peak intensity (R) of was measured. The leakage rate T (peak intensity ratio: S / R × 100) of light having a wavelength of 450 nm was calculated and evaluated according to the following criteria. The smaller the light leakage rate, the higher the color purity, which is preferable.
A: T <20%
B: 20 ≤ T ≤ 50%
C: T> 50%

[Discharge stability evaluation]
The ink composition was continuously ejected for 10 minutes using an inkjet printer (manufactured by Fujifilm Dimatics, trade name "DMP-2831"). In addition, 16 nozzles are formed in the head portion for ejecting ink of this inkjet printer, and the amount of ink composition used per nozzle per ejection is 10 pL. Discharge stability was evaluated according to the following criteria.
A: Continuous ejection is possible (continuous ejection is possible with 10 or more nozzles out of 16 nozzles)
B: Continuous ejection is not possible (out of 16 nozzles, the number of nozzles capable of continuous ejection is 9 or less)
C: Cannot be discharged

(Example 2)
After mixing 6.52 g of the QD / alicyclic epoxy monomer dispersion 2, 3.27 g of the light-scattering particle dispersion 2, and 0.22 g of the photocationic polymerization initiator, the mixture was mixed with a pore size of 5 μm. The ink composition was obtained by filtering with a filter. An optical conversion filter was obtained in the same manner as in Example 1 except that this ink composition was used. Using the obtained ink composition and a light conversion filter, leakage light evaluation and ejection stability evaluation were performed in the same manner as in Example 1. The results are shown in Table 1.

(Example 3)
After mixing 5.85 g of the QD / alicyclic epoxy monomer dispersion 1, 3.89 g of the light-scattering particle dispersion 3, and 0.26 g of the photocationic polymerization initiator, the mixture was mixed with a pore size of 5 μm. The ink composition was obtained by filtering with a filter. An optical conversion filter was obtained in the same manner as in Example 1 except that this ink composition was used. Using the obtained ink composition and a light conversion filter, leakage light evaluation and ejection stability evaluation were performed in the same manner as in Example 1. The results are shown in Table 1.

(Example 4)
After mixing 7.10 g of the QD / alicyclic epoxy monomer dispersion 2, 2.66 g of the light-scattering particle dispersion 4, and 0.25 g of the photocationic polymerization initiator, the mixture was mixed with a pore size of 5 μm. The ink composition was obtained by filtering with a filter. An optical conversion filter was obtained in the same manner as in Example 1 except that this ink composition was used. Using the obtained ink composition and a light conversion filter, leakage light evaluation and ejection stability evaluation were performed in the same manner as in Example 1. The results are shown in Table 1.

(Example 5)
An ink composition was obtained in the same manner as in Example 1 except that the QD / alicyclic epoxy monomer dispersion 3 was used instead of the QD / alicyclic epoxy monomer dispersion 1. An optical conversion filter was obtained in the same manner as in Example 1 except that this ink composition was used. Using the obtained ink composition and a light conversion filter, leakage light evaluation and ejection stability evaluation were performed in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 1)
After mixing 4.84 g of the alicyclic epoxy monomer, 4.84 g of the light-scattering particle dispersion 5, and 0.32 g of the photocationic polymerization initiator, the mixture is filtered through a filter having a pore size of 5 μm. To obtain an ink composition. A layer made of a cured product of the ink composition (cured product layer) was formed on the slide glass in the same manner as in Example 1 except that this ink composition was used, to obtain a substrate with a cured product layer. .. Using the obtained ink composition and the base material with a cured product layer, leakage light evaluation and ejection stability evaluation were performed in the same manner as in Example 1. That is, in the evaluation of leakage light of Comparative Example 1, a substrate with a cured product layer was used instead of the light conversion filter. The results are shown in Table 1.

(Comparative Example 2)
After mixing 8.03 g of the QD / alicyclic epoxy monomer dispersion 2, 1.69 g of the oxetane monomer, and 0.28 g of the photocationic polymerization initiator, the mixture is filtered through a filter having a pore size of 5 μm. To obtain an ink composition. An optical conversion filter was obtained in the same manner as in Example 1 except that this ink composition was used. Using the obtained ink composition and a light conversion filter, leakage light evaluation and ejection stability evaluation were performed in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 3)
After mixing 7.10 g of the QD / alicyclic epoxy monomer dispersion 2, 2.66 g of the light-scattering particle dispersion 6, and 0.25 g of the photocationic polymerization initiator, the mixture was mixed with a pore size of 5 μm. The ink composition was obtained by filtering with a filter. An optical conversion filter was obtained in the same manner as in Example 1 except that this ink composition was used. Using the obtained ink composition and a light conversion filter, leakage light evaluation and ejection stability evaluation were performed in the same manner as in Example 1. The results are shown in Table 1.

(Example 6)
First, a substrate (BM substrate) having a light-shielding portion called a black matrix (BM) was produced by the following procedure. That is, after applying black resist (“CFPR BK” manufactured by Tokyo Ohka Kogyo Co., Ltd.) on a glass substrate made of non-alkali glass (“OQ-10G” manufactured by Nippon Electric Glass Co., Ltd.), pattern exposure, development and baking are performed. By doing so, a patterned light-shielding portion was formed. The exposure was performed by irradiating the black resist with ultraviolet rays at an exposure amount of ^{200 mJ / cm 2.} The pattern of the light-shielding portion was a pattern having an opening portion corresponding to a sub-pixel of 200 μm × 600 μm, the line width was 20 μm, and the thickness was 2.6 μm.

Then, the ink composition obtained in Example 1 was printed on the opening portion on the BM substrate by an inkjet method, irradiated with ultraviolet rays, and then heated at 150 ° C. for 30 minutes in a nitrogen atmosphere. As a result, the ink composition was cured to form a pixel portion made of the cured product of the ink composition. The obtained pixel portion is a pixel portion that converts blue light into red light. The thickness of the pixel portion was 2.1 μm. By the above operation, a patterned optical conversion filter was obtained.

(Example 7)
A BM substrate was prepared in the same manner as in Example 6. Next, the ink composition obtained in Example 1 and the ink composition obtained in Example 5 were printed on the openings on the BM substrate by an inkjet method, and then irradiated with ultraviolet rays to obtain ink in the same manner as in Example 6. The composition was cured. As a result, a pixel portion that converts blue light into red light and a pixel portion that converts blue light into green light are formed on the BM substrate. By the above operation, a patterned optical conversion filter having a plurality of types of pixel portions was obtained.

10 ... Pixel part, 10a ... First pixel part, 10b ... Second pixel part, 10c ... Third pixel part, 11a ... First luminescent nanocrystal particles, 11b ... Second luminescent nanocrystal particles , 12a ... first light-scattering particles, 12b ... second light-scattering particles, 20 ... light-shielding part, 30 ... light conversion layer, 40 ... base material, 100 ... color filter.

Claims (24)

It contains luminescent nanocrystal particles, light-scattering particles, a polymer dispersant, a photopolymerizable compound, and / or a thermosetting resin.
The mass ratio of the content of the light-scattering particles to the content of the luminescent nanocrystal particles is 0.1 to 5.0.
An ink composition capable of forming an alkali-insoluble coating film. The ink according to claim 1, wherein the amount of the coating film of the ink composition dissolved in 1% by mass of the potassium hydroxide aqueous solution at 25 ° C. is 10% by mass or less based on the total mass of the coating film of the ink composition. Composition. The ink according to claim 1, wherein the amount of the coating film of the ink composition dissolved in 1% by mass of the potassium hydroxide aqueous solution at 25 ° C. is 3% by mass or less based on the total mass of the coating film of the ink composition. Composition. The ink composition according to any one of claims 1 to 3, wherein the mass ratio of the content of the light-scattering particles to the content of the luminescent nanocrystal particles is 0.2 to 2.0. The method according to any one of claims 1 to 4, wherein the light-scattering particles include at least one selected from the group consisting of titanium oxide, alumina, zirconium oxide, zinc oxide, calcium carbonate, barium sulfate and silica. Ink composition. The ink composition according to any one of claims 1 to 5 , which contains the photopolymerizable compound. The ink composition according to claim 6 , wherein the photopolymerizable compound is a photoradical polymerizable compound. The ink composition according to claim 6 , wherein the photopolymerizable compound is a photocationically polymerizable compound. The ink composition according to any one of claims 6 to 8 , wherein the photopolymerizable compound is alkali-insoluble. The ink composition according to any one of claims 1 to 9 , which contains the thermosetting resin. The ink composition according to claim 10 , wherein the thermosetting resin is alkali-insoluble. The ink composition according to any one of claims 1 to 11 , further containing a solvent having a boiling point of 180 ° C. or higher. The ink composition according to any one of claims 1 to 12 , which is for a color filter. The ink composition according to any one of claims 1 to 13 , which is used in an inkjet method. An optical conversion layer having a plurality of pixel portions.
The plurality of pixel portions are optical conversion layers having pixel portions containing a cured product of the ink composition according to any one of claims 1 to 14. Further, a light-shielding portion provided between the plurality of pixel portions is further provided.
The plurality of pixel portions are
The cured product is contained, and the luminescent nanocrystal particles include luminescent nanocrystal particles that absorb light having a wavelength in the range of 420 to 480 nm and emit light having a emission peak wavelength in the range of 605 to 665 nm. , The first pixel part,
The cured product is contained, and the luminescent nanocrystal particles include luminescent nanocrystal particles that absorb light having a wavelength in the range of 420 to 480 nm and emit light having a emission peak wavelength in the range of 500 to 560 nm. The optical conversion layer according to claim 15 , further comprising a second pixel portion. The optical conversion layer according to claim 16 , wherein the plurality of pixel portions further include a third pixel portion having a transmittance of 30% or more with respect to light having a wavelength in the range of 420 to 480 nm. The item according to any one of claims 15 to 17 , wherein the content of the light-scattering particles in the pixel portion containing the cured product is 0.1 to 40% by mass based on the total mass of the cured product. Optical conversion layer. The light according to any one of claims 15 to 18 , wherein the content of the light-scattering particles in the pixel portion containing the cured product is 7 to 30% by mass based on the total mass of the cured product. Conversion layer. A color filter comprising the optical conversion layer according to any one of claims 15 to 19. The method for producing an ink composition according to any one of claims 1 to 14.
The first step of preparing a dispersion of light-scattering particles containing the light-scattering particles and the polymer dispersant, and
A method for producing an ink composition, comprising a second step of mixing the dispersion of light-scattering particles and the luminescent nanocrystal particles. The method for producing an ink composition according to claim 21 , wherein the dispersion of the light-scattering particles further contains the photopolymerizable compound and / or the thermosetting resin. The method for producing an ink composition according to claim 21 or 22 , wherein in the second step, the photopolymerizable compound and / or the thermosetting resin is further mixed. Further comprising a step of preparing a dispersion of luminescent nanocrystal particles containing the luminescent nanocrystal particles, the photopolymerizable compound, and / or the thermosetting resin.
The production of the ink composition according to any one of claims 21 to 23 , wherein in the second step, the dispersion of the light-scattering particles and the dispersion of the luminescent nanocrystal particles are mixed. Method.

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