WO2023276802A1 - 黒色樹脂組成物およびブラックマトリックス基板 - Google Patents
黒色樹脂組成物およびブラックマトリックス基板 Download PDFInfo
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- WO2023276802A1 WO2023276802A1 PCT/JP2022/024815 JP2022024815W WO2023276802A1 WO 2023276802 A1 WO2023276802 A1 WO 2023276802A1 JP 2022024815 W JP2022024815 W JP 2022024815W WO 2023276802 A1 WO2023276802 A1 WO 2023276802A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/28—Nitrogen-containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
- C09D11/037—Printing inks characterised by features other than the chemical nature of the binder characterised by the pigment
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/32—Inkjet printing inks characterised by colouring agents
- C09D11/322—Pigment inks
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D201/00—Coating compositions based on unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
Definitions
- the present invention relates to a black resin composition and a black matrix substrate.
- Patent Document 1 Conventionally, there was an invention shown in Patent Document 1 as an invention of a black resin composition with low reflectivity used in the black matrix of displays.
- the invention disclosed in Patent Document 1 is characterized by using carbon black as black particles and adding transparent particles having a specific average secondary particle size to it for the purpose of reducing reflectance.
- Patent Document 2 there was an invention shown in Patent Document 2 as an invention of a black resin composition using titanium nitride as black particles.
- the invention disclosed in Patent Document 2 is characterized by using titanium nitride having a crystallite size of 10 nm or more and 50 nm or less as black particles, and having a light shielding property equivalent to that of a metal black matrix in spite of being a resin. rice field.
- the black resin composition of Patent Document 1 is used for black matrix applications of micro LED displays where low reflectivity is emphasized, the amount of transparent particles added in order to satisfy the required specifications may be adjusted for other applications. It was necessary to contain more than when using. As a result, the content of carbon black in the entire black resin composition is lowered, and when the black matrix is formed, the light-shielding property may be insufficient, resulting in problems such as light leakage. In addition, when the amount of the transparent particles added increases, the content of the resin component relatively decreases, so that the stability of the carbon black and the transparent particles over time deteriorates, resulting in a black color when the black matrix is formed. There was also the possibility that unevenness would occur.
- the black resin composition of Patent Document 2 has excellent light shielding properties.
- simply selecting and using titanium nitride as the black particles sometimes fails to meet the low-reflectance specifications required for black matrix applications in micro LED displays.
- an object of the present invention is to provide a black resin composition capable of reducing reflectance while maintaining high light-shielding properties.
- the inventors of the present invention made intensive studies to solve the above-described problems of the prior art, and found that the problems could be solved by the following.
- the average secondary particle size is 190 to 245 nm, and the composition formula: TiN x O y z X (wherein X is a metal atom, x is a number greater than 0 and less than 2, y is a number greater than or equal to 0 and less than 2 and z represents a number from 0 to less than 10) and a resin component.
- the black resin composition according to (1) or (2) further comprising transparent particles having a specific gravity of 0.7 to 2.5 times the specific gravity of the black particles.
- the transparent particles according to any one of (1) to (3) wherein the transparent particles are any one of barium sulfate, talc, mica, zinc carbonate, calcium carbonate, calcium fluoride, magnesium fluoride and barium fluoride.
- the black resin composition of the present invention has a composition formula with a larger average secondary particle size than the carbon black used in the conventional invention of Patent Document 1: TiN x O y zX (wherein , X is a metal atom, x is a number greater than 0 and less than 2, y is a number of 0 or more and less than 2, and z is a number of 0 or more and less than 10). Therefore, there is an effect that the total reflectance can be reduced while maintaining a high light shielding property.
- the amount thereof can be reduced.
- the content can be relatively increased.
- the content of the resin component is relatively increased, the stability of the black particles in the black resin composition over time is improved, and the problem of unevenness in forming the black matrix is reduced.
- it is composed of a resin component having a lower refractive index than the black particles and the content of the resin component is increased, there is an effect that the total reflectance of the surface when made into a black matrix is further relatively reduced. .
- the black matrix formed by using the black resin composition of the present invention also has the effect of having a very excellent black color.
- FIG. 10 is a graph plotting the OD value and total reflectance of “titanium BM” of Example 8 and “carbon BM” of Comparative Example 5.
- FIG. 10 is a micrograph of the pattern and cross-sectional shape of the black matrix of Example 9.
- FIG. 4 is a schematic cross-sectional view of a black matrix film formed of a black resin composition to which a small amount of transparent particles are added, showing a state in which the transparent particles are uniformly dispersed and distributed with the black particles.
- FIG. 4 is a schematic cross-sectional view of a black matrix film formed of a black resin composition to which a small amount of transparent particles are added, showing a state in which the transparent particles are unevenly distributed below the black particles.
- the black resin composition of the present invention has an average secondary particle size of 190 to 245 nm, and has a composition formula: TiN x O y zX (wherein X is a metal atom, x is a number greater than 0 and less than 2, y is a number of 0 or more and less than 2, and z is a number of 0 or more and less than 10) and a resin component.
- the black particles represented by the composition formula: TiN x O y ⁇ zX are composite particles composed of titanium oxynitride particles and metal X particles, and contain titanium nitride as a main component and usually titanium oxide TiO 2 as a secondary component.
- Ti n O 2n ⁇ 1 (1 ⁇ n ⁇ 20) and titanium oxynitride represented by TiN x O y (x is a number greater than 0 and less than 2, and y is a number greater than or equal to 0 and less than 2) contains
- composite particles refer to particles in which titanium oxynitride particles and metal X particles are composited or highly dispersed.
- composite means that the particles are composed of both titanium oxynitride and metal X particles, and “highly dispersed state” means titanium oxynitride particles and metal X particles. It means that the metal X particles exist individually, and the minor component particles are uniformly and evenly dispersed without agglomeration.
- x represents the ratio of nitrogen atoms to titanium atoms
- y represents the ratio of oxygen atoms to titanium atoms
- z represents the molar ratio of metal X atoms to TiN x O y .
- x can be a number greater than 0 and less than 2
- x is preferably 0.850 to 0.990 because titanium oxynitride is mainly composed of titanium nitride.
- y can take a number of 0 or more and less than 2, and the ratio y/x of y to x is preferably in the range of 0.010 to 0.100, more preferably in the range of 0.015 to 0.050 and more preferably in the range of 0.015 to 0.030.
- z can take a number of 0 or more and less than 10, but in order to suppress fusion and oxidation of the metal X particles, it is preferably in the range of 0.01 to 1, and 0.01 to 0.50. A range is more preferred.
- the content of metal X atoms, the content of titanium atoms, the content of nitrogen atoms, and the content of oxygen atoms can be analyzed by ICP emission spectrometry. Based on these analysis results, x, y, and z are calculated. However, depending on the method for producing the particles, atoms other than the above-mentioned titanium atoms, nitrogen atoms, oxygen atoms, and metal X atoms may be contained as impurities. Do the calculation without taking it into account.
- Metal X is not particularly limited, and preferred examples include copper, silver, gold, platinum, palladium, nickel, tin, cobalt, rhodium, iridium, iron, ruthenium, osmium, manganese, molybdenum, tungsten, niobium, tantalum, At least one selected from calcium, titanium, bismuth, antimony, lead, or alloys thereof can be used. More preferred metals are copper, silver, gold, platinum, palladium, nickel, tin, cobalt, rhodium, iridium or alloys thereof, and more preferred metal X is selected from copper, silver, gold, platinum, tin or alloys thereof. at least one type of
- the content of the metal X particles is preferably 5% by mass or more and 50% by mass or less, more preferably 10% by mass or more and 30% by mass or less, relative to the total mass of the black particles.
- the content of the metal X particles is 5% by mass or more, the light shielding property is improved.
- the content of the metal X particles is 50% by mass or less, the total reflectance of the coating film is further lowered.
- the metal X particles are granulated in a more stable state than when the metal X particles are synthesized alone, and the metal X particles exist without being subjected to surface coating or other treatments.
- the metal X particles it is preferable to make the particles moderately fine, but on the other hand, the total reflectance is often increased. Therefore, in the present invention, the metal X particles and the titanium oxynitride particles are finely divided in the initial process of producing them, and are made into moderately large particles in the final process of being contained as a black resin composition. did.
- the primary particles are produced with an appropriate crystallite size in order to maintain high light-shielding properties as the initial metal X particles and titanium oxynitride particles, but finally contained as a black resin composition.
- the black particles in the state secondary particles having a moderately large particle diameter are used to obtain black particles having both a high light shielding property and a low total reflectance (see FIG. 1).
- the crystallite size of the metal X particles will be described, taking as an example the case where the metal X particles are silver.
- the crystallite size obtained from the half-value width of the Ag (111) plane to obtain a high light-shielding property is preferably 5 nm or more and 40 nm or less.
- the crystallite size referred to here is the crystallite size calculated using Scherrer's formula shown in the following formulas (1) and (2) from the half width of the main peak with the strongest intensity in the X-ray diffraction spectrum. is.
- Titanium oxynitride particles are preferably less oxidized on the particle surface (containing less oxygen) because higher light-shielding properties can be obtained, and it is particularly preferable not to contain TiO2 as an accessory component.
- the oxygen atom content is preferably 10% by mass or less, more preferably 6.0% by mass or less.
- the crystallite size of the titanium oxynitride is also preferably 50 nm or less like the metal particles X, and more preferably 10 nm or more and 40 nm or less.
- the light transmitted through the coating film exhibits a blue to blue-violet color with a peak wavelength of 475 nm or less, and the black matrix has high light shielding properties. can be obtained.
- the transmittance of ultraviolet rays especially i-line (365 nm)
- i-line 365 nm
- the film hardening due to light irradiation proceeds sufficiently, resulting in a high OD and shape. It is possible to form a good black matrix of
- the method for producing the primary particles which are the raw materials of the black particles represented by the composition formula: TiN x O y ⁇ zX of the present invention, is not particularly limited, but a thermal plasma method using a nitrogen-containing gas as the plasma gas can be used.
- the titanium powder and the metal particle X powder are premixed at a predetermined mixing ratio, dispersed in the state of primary particles, and at the same time, these powders are further uniformly mixed, and while this mixed state is maintained, the thermal plasma flame supply inside.
- a uniformly mixed powder material sprayed into a thermal plasma flame evaporates into a more highly dispersed mixture in the gas phase, which is then quenched in the chamber to produce primary particles.
- the method is not particularly limited, but a thermal plasma method using a nitrogen-containing gas as the plasma gas can be used.
- the titanium powder and the metal particle X powder are premixed at a predetermined mixing ratio, dispersed in the state of primary particles, and at the same time, these powders are further uniformly
- the primary particles of the composition formula: TiN x O y ⁇ zX of the present invention obtained by the thermal plasma method or the like have a specific specific surface area, and the suitable value thereof is preferably 25 m 2 /g to 45 m 2 /g. , can be obtained by the BET method.
- the numerical value obtained by the BET method is 25 m 2 /g or more , the black particles having a desired average secondary particle diameter are prepared, and the light-shielding properties are further improved. It is possible to suppress the deterioration of the dispersion stability due to aggregation of primary particles when dispersed in a medium.
- the primary particles of the black particles are dispersed in a solvent or the like using a mixer disperser.
- a method of directly dispersing in a mixture of a medium and a resin component described later and adjusting the time for the dispersion to an appropriate time can be used.
- the primary particles of the black particles are dispersed with a dispersion medium such as a polymer dispersant or a solvent, and the dispersion time is adjusted to an appropriate time to form a dispersion, and then the resin component described below is added later using a mixing and dispersing machine. It may be a method of producing using.
- bead mill When using a mixing and dispersing machine, it is recommended to use a bead mill, ball mill, sand grinder, three-roll mill, high-speed impact mill, etc.
- bead mills include coball mills, basket mills, pin mills, dyno mills, nano mills, and apex mills.
- Bead mill beads include titania beads, zirconia beads, zircon beads and the like, and may be dispersed using a bead mill having a centrifugal separator capable of separating the bead mill and the dispersion liquid.
- the diameter of the beads used for the dispersion is preferably 0.05-0.5 mm.
- the "average secondary particle size" means that the black resin composition containing black particles is diluted with a dispersion solvent or an equivalent solvent, measured by a dynamic light scattering method, and is measured by a cumulant method. Refers to the obtained average particle size value of black particles. It is a numerical value obtained by diluting with a pyrrolidone solvent to a particle concentration of 0.24% by mass. By adjusting the average secondary particle size of the black particles to 190 to 245 nm, it is possible to maintain the low reflection performance while maintaining the light shielding properties.
- the average secondary particle size of the black particles is larger than 245 nm, problems such as sedimentation of the black particles during storage and a decrease in light shielding properties occur. In addition, the sedimented coarse particles hinder the adhesion between the substrate and the coating film, thereby deteriorating the development characteristics.
- the development characteristics refer to the linearity of the pattern and the cross-sectional shape of the coating film.
- the average secondary particle size of the black particles is smaller than 190 nm, there is a problem that the total reflectance increases even if the crystallite size of the raw black particles is within the aforementioned suitable range.
- OD -log [transmittance]
- the edge linearity when forming the above black matrix pattern is required, and the black matrix surface and base material must be flat. Adhesion must also be ensured. In order to satisfy these required performances, it is more preferable to adjust the average secondary particle size of the black particles to 202 nm to 233 nm.
- the content of the resin having a lower refractive index than the black particles is relatively increased, in addition to obtaining the effect of improving the stability of the black particles in the black resin composition over time, unevenness when forming the black matrix problem is also reduced.
- the black particles can be stably retained over time, even black particles having an average secondary particle diameter larger than that of the transparent particles of the invention of Patent Document 1 can be used without problems.
- the resin since the resin has a lower refractive index than the black particles, the total reflectance of the resin surface is lower than that of the black particle surface in terms of material. It also contributes to a reduction in total reflectance. The effect becomes greater as the resin content increases. In that respect, in the present invention, it is not necessary to add transparent particles as in the invention of Patent Document 1, or even if they are added, the amount can be reduced, so the resin content in the entire black resin composition The rate can be relatively increased, and the invention of the present application is superior to the invention of Patent Document 1.
- transparent particles such as the invention of Patent Document 1 reduce the total reflectance, they also transmit visible light, which causes a decrease in light shielding properties.
- the transparent particles may be absent or, if present, only in a small amount. Therefore, even when the black matrix is formed, the light-shielding property is maintained and there is little possibility of causing problems such as light leakage.
- even transparent particles do not completely transmit visible light, and part of the particles tends to diffusely reflect and the surface becomes white and turbid. As a result, the original black color of the black particles cannot be maintained, resulting in a slightly grayish dull black color.
- the black matrix formed by using the black resin composition of the present invention can maintain the original black color of the black particles, resulting in a very excellent black color.
- the “refractive index of the resin” refers to the coating film surface when the coating film-forming components are cured, excluding the black particles and the solvent removed during the manufacturing or curing process from the black resin composition of the present invention.
- the cured resin includes not only the resin alone but also those curing agents and polymerization initiators. It is the refractive index of the coating film surface. Therefore, when the numerical value of the refractive index obtained by measuring the coating film surface is lower than the refractive index of the black particles alone, it corresponds to "a resin having a lower refractive index than the black particles".
- the "refractive index of the black particles” is a numerical value determined by the liquid immersion method listed in JIS-K7142. Specifically, a dispersion liquid is prepared by dispersing black particles in a toluene solvent, the refractive index of the dispersion liquid is changed, light is irradiated, and the refractive index when the scattered light due to the black particles in the dispersion liquid becomes invisible visually. is the refractive index of the black particles. Since the change in scattered light is observed visually, there is some subjectivity in the numerical value, but when the upper limit of the width is higher than the refractive index of the resin, it can be said that "the refractive index is lower than that of the black particles. It corresponds to "resin".
- the black particles of TiN x O y ⁇ zX of the present invention have a refractive index in the range of 1.68 ⁇ 0.05, and at least if the refractive index of the resin is 1.6 or less, the refractive index is higher than that of the black particles. corresponds to resins with low
- Examples of the resin component having a lower refractive index than the black particles represented by the composition formula: TiN x O y ⁇ zX include polyimide-based resins, acrylic-based resins, polyester-based resins, vinyl-based resins, and polyvinyl alcohol-based resins. etc. Among these resins, polyimide resins having high heat resistance are preferable. Polyimide-based resins also include polyamide-imide, and are not particularly limited, but those obtained by imidizing a polyimide precursor by heating or with an appropriate catalyst are preferably used.
- tetracarboxylic dianhydrides which have particularly high light absorption at wavelengths in the visible light region, are more preferable because they also provide light-shielding properties.
- the tetracarboxylic dianhydride is preferably a tetracarboxylic dianhydride having a higher electron-withdrawing property of the acid dianhydride residue, such as a ketone type such as a benzophenone group, an ether type such as a diphenyl ether group, or a phenyl group. and those having a sulfone group such as a diphenylsulfone group.
- the diamine component may be copolymerized as long as the heat resistance is not lowered.
- Diamines are preferred as the diamine residue has a stronger electron-donating property.
- it may have a structure in which these aromatic rings are substituted with a nitro group.
- the content of the resin component having a lower refractive index than the black particles is preferably 45% by mass to 80% by mass of the total mass of the black resin composition. If it is 45% by mass or more, the effect obtained by increasing the content of the resin component becomes remarkable, and if it is 80% by mass or less, the content of black particles is relatively high, and the light shielding property is improved. improve more.
- one or more kinds of solvents can be contained for the purpose of dissolving or dispersing the black particles having the specific average secondary particle size and the resin.
- the type of solvent is not particularly limited, and various alcohols, terpenes, ketones, aromatic hydrocarbons, glycol ethers, acetic esters, etc., may be used. Or it must have the ability to disperse.
- a polyimide resin is selected as a resin having a lower refractive index than black particles, N-methyl-2-pyrrolidone, N,N-dimethylacetamide, N, Preferred are amide-based polar solvents such as N-dimethylformamide, lactone-based polar solvents, and dimethylsulfoxide.
- the black resin composition of the present invention consists of black particles having a specific average secondary particle size and a resin component, but if necessary, a solvent, a curing accelerator, a thermal polymerization inhibitor, an antioxidant, a plasticizer , a leveling agent, an antifoaming agent, a coupling agent, a surfactant, and other additives may be added.
- thermal polymerization inhibitors examples include hydroquinone, hydroquinone monomethyl ether, pyrogallol, tert-butyl catechol, phenothiazine, and the like.
- antioxidants include hindered phenol compounds.
- Dibutyl phthalate, dioctyl phthalate, tricresyl phosphate and the like can be mentioned, and examples of antifoaming agents and leveling agents include silicone-based, fluorine-based and acrylic-based compounds.
- surfactants examples include fluorine-based surfactants and silicone-based surfactants.
- the transparent particles may be added to the black resin composition of the present invention.
- the transparent particles preferably have a specific gravity of 0.7 to 2.5 times the specific gravity of the black particles, more preferably 0.9 to 2.5 times, still more preferably 1.4 to 2.5 times. is.
- the black matrix film 1 is formed on the substrate 2 by adding a small amount of the transparent particles 4 having the specific gravity, the black matrix film 1 (see FIG. 3) in which the transparent particles 4 are uniformly dispersed and distributed with the black particles 3, or the transparent particles.
- a black matrix film 1 in which the particles 4 are unevenly distributed below the black particles 3 is formed.
- the transparent particles 4 increase the scattering effect on the light incident through the base material 2 from below, and the ratio of specular reflection is reduced, so that the antireflection effect is improved.
- the amount of the transparent particles 4 added is small and the black particles 3 hardly interfere with the light-shielding properties and hue, there is no possibility that problems such as light leakage will occur, and the original black color of the black particles will not occur. Color is also maintained.
- the transparent particles have a specific gravity less than 0.7 times the specific gravity of the black particles, the transparent particles 4 are unevenly distributed above the black particles 3, and the light incident through the base material 2 from below Less scattering effect.
- the transparent particles have a specific gravity exceeding 2.5 times the specific gravity of the black particles, the transparent particles 4 and the black particles 3 are distributed in a layer-separated state, and delamination is likely to occur, and the transparent particles The sedimentation problem of 4 tends to occur.
- transparent particles examples include inorganic transparent fine particles such as metal oxides such as silica and metal compounds such as barium sulfate, and resin-based transparent fine particles such as acrylic resins, styrene-acrylic resins, silicone resins, epoxy resins, and melamine resins. is mentioned. These transparent particles may be appropriately selected depending on the content of black particles, particularly metal X particles of the composition formula: TiNxOy.zX.
- the specific gravity of the black particles is low, so silica having a relatively low specific gravity is preferable, and when the value of z is 0.1 or more, the specific gravity of the black particles
- Metal compounds such as barium sulfate having a relatively high specific gravity are preferable, and when the value of z is 0.01 or more and less than 0.1, the above metal compounds or resin-based transparent fine particles such as acrylic resins are preferable. .
- the value of z is more preferably in the range of 0.01 to 0.50 in order to suppress fusion and oxidation of the metal X particles.
- Zinc carbonate, calcium carbonate, calcium fluoride, magnesium fluoride, barium fluoride and the like are preferred. These transparent particles have a relatively high specific gravity, and even black particles with a high z value become transparent particles with a specific gravity 0.7 to 2.5 times the specific gravity of the black particles.
- calcium fluoride, magnesium fluoride, and barium fluoride are more preferable because they have a relatively low refractive index and further improve the antireflection effect.
- the transparent particles when transparent particles with a large specific gravity and a refractive index equal to or lower than that of the base material are contained, the transparent particles are unevenly distributed near the area in contact with the base material, and the refractive index is relatively high near the area. Since light travels from a high base material to a medium region with a low refractive index, specular reflection does not occur much, and the light is transmitted straight through the transparent particles and reflected near the interface between the transparent particles and the resin binder. become more frequent.
- the interface Since the interface has an irregular or curved shape unlike a flat substrate surface, most of the light reflected at the interface becomes diffusely reflected light that scatters in multiple directions, and the ratio of specularly reflected light is greatly reduced. It is believed that the diffusely reflected light is further scattered in multiple directions on the surface of the black particles, and the scattered lights cancel each other out, resulting in a reduction in the total reflectance.
- the average secondary particle size of the transparent particles is preferably 50 to 500 nm, which has good compatibility with the black particles, and is appropriately selected in order to impart the effect of scattering incident light. Further, it is preferable to select the size appropriately from 100 to 300 nm.
- the content of the transparent particles is in the range of 0.0005 to 0.8% by mass with respect to the total amount of the black resin composition, so as not to hinder the light-shielding properties and hue of the black particles 3. It is preferable to select them appropriately. Further, it is preferable to select it appropriately within a small range of 0.001 to 0.5% by mass with respect to the total amount of the black resin composition.
- particles having an average secondary particle diameter of 140 to 230 nm are added in an amount of 0.003 to 0.1% by mass with respect to the total amount of the black resin composition, and in the case of barium sulfate particles, the average secondary particle diameter is 150.
- An example of adding 0.002 to 0.2% by mass of particles of up to 240 nm with respect to the total amount of the black resin composition is given.
- the black resin composition of the present invention has the above-described high light shielding properties and low reflectance, it can be suitably used for the black matrix of micro LED displays or organic EL displays. Since these displays are self-luminous and improve contrast, the occupied area ratio of the black matrix is set higher than that of conventional liquid crystal displays.
- the blackness of the black matrix is lowered and the contrast of the screen is lowered. Therefore, low reflectivity of the black matrix is required, and it is particularly useful for the self-luminous display.
- ⁇ Method for producing black matrix> As a method for applying the black resin composition of the present invention on a micro LED display or organic EL display substrate, known solution dipping method, spray method, ink jet machine, roller coater machine, land coater machine, slit coater machine and Any method such as a method using a spinner machine may be adopted. If the resin component is a polyimide-based resin, the method using a comma coater is preferable from the viewpoint of obtaining a good coating film. After adjusting the viscosity with a solvent and applying it to the desired thickness, the solvent is removed by heating or under reduced pressure to form a dry coating film. A reflective black resin composition film can be formed.
- a photoresist is coated on the black resin composition film formed above, dried, irradiated with ultraviolet rays in a pattern through a photomask, exposed, and developed.
- patterning methods ie photolithographic methods.
- a lattice-like or matrix-like black pattern is formed on the transparent substrate.
- This matrix-like black pattern is called a black matrix, and a substrate having it is called a black matrix substrate.
- a portion of the black matrix substrate where no black matrix is formed is called an opening.
- a pattern may be formed by applying a screen printing method, an intaglio printing method, a gravure printing method, or the like, or an inkjet method that does not require a mask or a printing plate may be used.
- the black resin composition of the present invention may be applied to other uses.
- other applications include display screens of personal computers, tablet PCs, game machines, navigation systems, liquid crystal televisions, video displays, and liquid crystal projectors.
- the black resin composition of the present invention is applied in parallel to the transparent substrate, the total reflectance of the black resin composition-formed portion, i.e., the black matrix portion measured from the transparent substrate surface side is 5% or less. , a black matrix substrate having an OD value of 3.0 or more is obtained.
- a color filter substrate is obtained by applying a chromatic resin composition to the openings of the black matrix substrate.
- a micro LED or organic EL material is formed in the openings of this black matrix substrate, a micro LED display or organic EL display can be obtained. Further, by combining the color filter substrate with the micro LED display or organic EL display, a micro LED display or organic EL display with higher image quality can be obtained.
- Example 1 [Production of primary particles] Argon gas and nitrogen gas were supplied at 50 liters/minute and nitrogen gas at 50 liters/minute into the plasma pouch, and a high frequency voltage was applied to generate an argon-nitrogen gas thermal plasma flame. Next, a powder material manufactured by Nisshin Engineering Co., Ltd., which is a mixture of titanium particles and silver particles at a predetermined ratio, is supplied into the thermal plasma flame in the plasma pouch together with 10 liters/minute of argon gas supplied from the material supply device. and evaporated in a hot plasma flame to a highly dispersed mixture in the gas phase. The mixture was then quenched in a chamber to obtain primary particles of titanium silver oxynitride.
- a powder material manufactured by Nisshin Engineering Co., Ltd. which is a mixture of titanium particles and silver particles at a predetermined ratio
- composition analysis was performed using an ICP mass spectrometer (manufactured by Hitachi High-Tech Science Co., Ltd., atom ES)
- the titanium content was 68.4% by mass
- the nitrogen content was 19.6% by mass
- the oxygen content was 0.5% by weight
- Total reflectance (low reflection performance) measurement The resulting black resin composition was coated on a non-alkali glass (OA-2, refractive index 1.52, manufactured by Nippon Electric Glass Co., Ltd.) substrate with a spinner, dried with hot air at 80 ° C. for 10 minutes, and then at 120 ° C. for 1 hour. A glass substrate with a black resin composition film having a coating film having a thickness of 1.0 ⁇ m formed thereon by heat curing was produced. The total reflectance through the glass surface side of the obtained black resin composition film-coated glass substrate was measured using an ultraviolet-visible spectrophotometer (manufactured by Shimadzu Corporation, UV-2450), and both the incident angle and the reflection angle were 5. Measured under the setting conditions of °.
- Example 1 ⁇ when the total reflectance is less than 5.15%, ⁇ when it is 5.15% or more and less than 5.35%, ⁇ when it is 5.35% or more and less than 5.40%, 5.40% or more
- the case was marked with x.
- the total reflectance value obtained in Example 1 was 4.80%, which was extremely excellent low reflectance performance.
- the total reflectance of the non-alkali glass is about 4.2%, and the measured value of the total reflectance includes the total reflectance of the non-alkali glass.
- the resulting black resin composition was coated on a non-alkali glass (OA-2, manufactured by Nippon Electric Glass Co., Ltd.) substrate with a spinner, dried with hot air at 80° C. for 10 minutes, and then cured by heating at 120° C. for 1 hour to form a film.
- a glass substrate with a black resin composition film on which a coating film having a thickness of 1.0 ⁇ m was formed was prepared.
- the OD value passed from the glass surface side of the obtained black resin composition film-coated glass substrate was measured using an ultraviolet-visible spectrophotometer (manufactured by Shimadzu Corporation, UV-2450) at both an incident angle and a reflection angle of 5°. Measured under set conditions.
- the OD value obtained in Example 1 was 3.00, indicating good light shielding performance.
- OA-2 non-alkali glass
- the exposed coated plate was subjected to shower development at 23° C. and 1 kgf/cm 2 pressure in a 0.05% potassium hydroxide aqueous solution. After developing for 2 seconds, the film was washed with water spray at 5 kgf/cm 2 pressure to remove the unexposed areas of the coating film to form a pixel pattern on the glass substrate. Thermal post bake for 30 minutes. The obtained 20 ⁇ m line after post-baking was observed with a microscope and SEM, and x was given when burrs were observed, and ⁇ was given when no burrs were observed. In addition, when no burrs were observed, but protrusions were observed on the surface and the flatness was deteriorated, or when the variation in film thickness was large, it was judged to be ⁇ .
- Examples 2-7 and Comparative Examples 1-4 A black resin composition was obtained in the same manner as in Example 1, except that the treatment time (RT) for pulverization and dispersion was changed, and the average secondary particle size was measured. Also, in the same manner as in Example 1, the degree of sedimentation of the black particles was visually confirmed. Also, a coating film of the black resin composition was formed in the same manner as in Example 1, and the total reflectance and OD value were measured. The obtained results, including those of Example 1, are shown in Table 1 below.
- Example 8 In Example 6, the black resin composition was coated in the same manner as in Example 6, except that the content ratio of the black particles in the black resin composition (mass% of black particles: mass% of resin component) was changed multiple times. Films were obtained and the OD values and total reflectance were measured and shown in Table 2. Then, plotted on a graph with the unit film thickness OD value on the horizontal axis and the total reflectance on the vertical axis, the obtained result is shown in FIG. 1 as "titanium BM".
- Example 5 A coating film of a black resin composition was obtained in the same manner as in Example 8 except that the black particles in Example 8 were changed to carbon black TPK-1227R manufactured by Cabot Corporation, and the OD value and total reflectance were measured, Table 2 shows. Then, the OD value is plotted on the horizontal axis and the total reflectance is plotted on the vertical axis, and the obtained result is shown in FIG. 1 as "carbon BM".
- the approximated correlation line of "titanium BM" according to Example 8 has a gentler slope and a smaller intercept than the approximated correlation line of "carbon BM" according to Comparative Example 5 (the total reflection at the same OD value ratio is low), the low reflection performance due to the black particles of the black resin composition of the present invention is low when the content ratio of the black particles (% by mass of black particles:% by mass of resin component) is in the range of 37:63 to 63:37 , is superior to the conventional black resin composition using carbon black.
- Example 9 The black resin composition obtained in Example 6 was coated on a G4.5 (730 mm ⁇ 920 mm) glass substrate with a comma coater, dried with hot air at 80° C. for 10 minutes, and then semi-cured at 120° C. for 20 minutes. Thereafter, a positive resist (Shipley “Microposit” (registered trademark) RC100 30 cp) was applied with a comma coater and dried at 80° C. for 20 minutes.
- a positive resist Chipley “Microposit” (registered trademark) RC100 30 cp
- PLA-501F manufactured by Canon Inc.
- exposure is performed through a predetermined photomask, and an alkaline developer (Shipley “Microposit” (registered trademark) 351) is used to develop the positive resist and etch the polyimide precursor.
- the positive resist was stripped with methyl cellosolve acetate. Further, it was cured at 300° C. for 30 minutes to obtain a black matrix substrate with a film thickness of 1.1 ⁇ m.
- FIG. 2 shows a microphotograph of the pattern and cross-sectional shape of the obtained black matrix substrate.
- Example 10-21 In addition to the black particles (specific gravity 1.9) of Example 4, 0.02% by mass of each of the following transparent particles was added to the total amount of the black resin composition, and the black resin composition was prepared in the same manner as in Example 4. A coating film was formed and the total reflectance and OD value were measured. The results obtained are shown in Table 3 below. Further, the average secondary particle size of the following transparent particles was measured in the same manner as in Example 1, and the degree of sedimentation of the transparent particles was visually confirmed.
- Calcium fluoride manufactured by Stella Chemifa Corporation, calcium fluoride nanoparticles Magnesium fluoride; manufactured by Stella Chemifa Corporation, magnesium fluoride nanoparticles Barium fluoride; manufactured by Stella Chemifa Corporation, barium fluoride Silica; Nissan Chemical Industries, Ltd. Organo silica sol NMP-ST Polyvinyl chloride; Ryuron paste C38 manufactured by Tosoh Corporation Polycarbonate; Polycarbonate 3D powder manufactured by Materis Co., Ltd. Titanium oxide; PT-401M manufactured by Ishihara Sangyo Co., Ltd.
- Example 22 A black matrix substrate was obtained in the same manner as in Example 9, except that the black resin composition obtained in Example 4 was used instead of the black resin composition obtained in Example 6.
- Examples 23 and 24 Using an inkjet coating device, the openings of the black matrix substrates obtained in Examples 9 and 22 were filled with the following red, green, and blue colored inks in a mosaic pattern to form a color filter substrate. did. The OD value and total reflectance of the black matrix portion of the obtained color filter substrate were the same as those of the black matrix substrates obtained in Examples 9 and 22.
- Examples 25 and 26 Using an inkjet coating device, the openings of the black matrix substrates obtained in Examples 9 and 22 were filled with red, green, and blue organic EL materials (RGB ink set manufactured by Merck) in a mosaic pattern. Then, an organic EL display was produced. The OD value and total reflectance of the black matrix portion of the obtained organic EL display were the same as those of the black matrix substrates obtained in Examples 9 and 22.
- red, green, and blue organic EL materials RGB ink set manufactured by Merck
- Example 27 and 28 Using an inkjet coating device, red, green, and blue micro LED display materials (inkjet for quantum dot color conversion layer manufactured by DIC Corporation) were applied to the openings of the black matrix substrates obtained in Examples 9 and 22. ink) in a mosaic pattern to fabricate a micro LED display. The OD value and total reflectance of the black matrix portion of the obtained micro LED display were the same as those of the black matrix substrates obtained in Examples 9 and 22.
- Example 29 and 30 The color filter substrate obtained in Example 24 was placed on top of a separately prepared commercially available organic EL display and micro LED display, and the organic EL display comprising the color filter substrate and the micro LED comprising the color filter substrate A display was produced.
- the resulting organic EL display and micro LED display had an OD value and a total reflectance of the black matrix portion of the color filter substrate placed thereon that were equal to the OD value and total reflectance of the black matrix substrate obtained in Example 22. Same as reflectance. From this result, it was found that the performance reflectance and OD value required for black matrices for micro LED displays and organic EL displays can be obtained.
- black matrix 2 transparent substrate 3: black particles 4: transparent particles
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Abstract
Description
(1) 平均二次粒子径が190~245nmであり、組成式:TiNxOy・zX(式中、Xは金属原子、xは0より大きく2未満の数、yは0以上2未満の数、zは0以上10未満の数を表す)で表される黒色粒子と、樹脂成分とを含有する黒色樹脂組成物。
(2) 前記黒色粒子の平均二次粒子径が、202~233nmである(1)に記載の黒色樹脂組成物。
(3) 前記黒色粒子の比重に対して0.7~2.5倍の比重の透明粒子をさらに含有する(1)または(2)に記載の黒色樹脂組成物。
(4) 前記透明粒子が、硫酸バリウム、タルク、マイカ、炭酸亜鉛、炭酸カルシウム、フッ化カルシウム、フッ化マグネシウムおよびフッ化バリウムのいずれかである(1)~(3)のいずれかに記載の黒色樹脂組成物。
(5) 透明基材上に(1)~(4)のいずれかに記載の黒色樹脂組成物の硬化物がマトリックス状にパターン形成されてなるブラックマトリックス基板であって、前記透明基材表面側から測定したブラックマトリックスの全反射率が5%以下であって、OD値が3.0以上であるブラックマトリックス基板。
(6) (5)に記載のブラックマトリックス基板の開口部に着色層が形成されてなるカラーフィルタ基板。
(7) (5)に記載のブラックマトリックス基板の開口部にマイクロLEDまたは有機EL材料を具備するマイクロLEDディスプレイまたは有機ELディスプレイ。
(8) (6)に記載のカラーフィルタ基板を具備するマイクロLEDディスプレイまたは有機ELディスプレイ。
<黒色粒子>
本発明の黒色樹脂組成物は、平均二次粒子径が190~245nmであり、組成式:TiNxOy・zX(式中、Xは金属原子、xは0より大きく2未満の数、yは0以上2未満の数、zは0以上10未満の数を表す)で表される黒色粒子と、樹脂成分とを含有することを特徴とする。
またチタン酸窒化物粒子は、粒子表面の酸化が少ない(含有する酸素量が少ない)方がより高い遮光性が得られるため好ましく、とりわけ副成分としてTiO2を含有しないことが好ましい。その酸素原子の含有量としては10質量%以下であることが好ましく、さらに好ましくは6.0質量%以下である。チタン酸窒化物の結晶子サイズも金属粒子Xと同様に50nm以下であることが好ましく、更には10nm以上40nm以下であることが好ましい。
その前記組成式:TiNxOy・zXで表される黒色粒子よりも屈折率が低い樹脂成分の例としては、ポリイミド系樹脂、アクリル系樹脂、ポリエステル系樹脂、ビニル系樹脂、ポリビニルアルコール系樹脂等が挙げられる。これらの樹脂の中でも、耐熱性が高いポリイミド系樹脂が好ましい。ポリイミド系樹脂にはポリアミドイミドも含まれ、特に限定されるわけではないが、ポリイミド前駆体を加熱もしくは適当な触媒によってイミド化したものが好ましく用いられる。
ニルスルホン基のようなスルホン基を有するものなどが挙げられる。具体的には3,3´,4,4´-ビフェニルテトラカルボン酸二無水物、3,3´,4,4´-ベンゾフェノンテトラカルボン酸二無水物、ピロメリット酸二無水物などである。
また本発明の黒色樹脂組成物は、必要があれば透明粒子を少量添加しても構わない。特に前記黒色粒子の比重に対して0.7~2.5倍の比重の透明粒子が好ましく、より好ましくは0.9~2.5倍であり、さらに好ましくは1.4~2.5倍である。当該比重の透明粒子4を少量加えて基材2にブラックマトリックスの膜1を形成すると、透明粒子4が黒色粒子3と均一に分散分布するブラックマトリックスの膜1(図3参照)、または透明粒子4が黒色粒子3よりも下部に偏在分布するブラックマトリックスの膜1(図4参照)が、形成される。
本発明の黒色樹脂組成物は、上述した高い遮光性および低反射率を有することから、マイクロLEDディスプレイまたは有機ELディスプレイのブラックマトリックスに好適に用いることができる。これらのディスプレイは自発光型でありコントラストを向上させるため、従来の液晶ディスプレイよりもブラックマトリックスの占有面積比率が高く設定されている。
本発明の黒色樹脂組成物をマイクロLEDディスプレイまたは有機ELディスプレイ基板上に塗布する方法としては、公知の溶液浸漬法、スプレー法の他、インクジェット機、ローラーコーター機、ランドコーター機、スリットコーター機やスピナー機を用いる方法等の何れの方法を採用しても構わない。樹脂成分がポリイミド系樹脂であれば、コンマコーターによる方法が良好な塗布膜を得る点で好ましい。溶剤により適正粘度に調整し、所望の厚さに塗布した後、加熱もしくは減圧下で溶剤を除去することにより乾燥塗膜が形成され、さらなる光及び/又は熱により硬化することで目的とする低反射性の黒色樹脂組成物皮膜が形成できる。
[一次粒子の製造]
プラズマポーチ内に50リットル/分のアルゴンガスと50リットル/分の窒素ガスを供給し、高周波電圧を印加してアルゴン―窒素ガス熱プラズマ炎を発生させた。次いで、チタン粒子と銀粒子を所定の比率で混合した日清エンジニアリング株式会社製の粉末材料を、材料供給装置から供給される10リットル/分のアルゴンガスとともにプラズマポーチ内の熱プラズマ炎中に供給し、熱プラズマ炎中で蒸発させ、気相状態で高度に分散した混合物とした。その後、その混合物をチャンバー内で急冷し、酸窒化チタン銀の一次粒子を得た。
上記得られた一次粒子に、粒子濃度が0.1質量%程度になるよう溶剤を添加して希釈し、得られた希釈液をカーボン支持膜付き金属性メッシュへ滴下して測定用サンプルを作製し、Macsorb HM MODEL-1208(株式会社マウンテック製)を用いてBET流動法(1点法)、 前処置条件300℃ 30分加熱(N2ガスフロー)にて、BET比表面積を測定した。得られたBET比表面積は36.4m2/gであった。
また、ICP質量分析装置(株式会社日立ハイテクサイエンス社製、attom ES)を用いて組成分析を行ったところ、チタン含有量は68.4質量%、窒素含有量19.6質量%、酸素含有量0.5質量%、銀含有量11.5質量%であり、チタン:窒素:酸素:銀の原子の比率は、68.4/47.867:19.6/14.007:0.5/15.999:11.5/107.868=1.429:1.399:0,031:0.107=1:0.979:0.022:0.075となる。したがって、組成式はTiN0.979O0.022・0.075Agであった(y/x:0.022)。蛍光X線装置(株式会社リガク製、ZSX-PrimusIII)を用いて出力30kV 100mA、波長分散法にてフッ化リチウムを用いて、2θ=10°~90°測定にて得られた結晶子サイズは33.6nmであった。
3,3´,4,4´-ビフェニルテトラカルボン酸二無水物147gを、N-メチル-2-ピロリドン775gと共に仕込み、4,4´-ジアミノジフェニルエ-テル95.1gおよびビス(3-アミノプロピル)テトラメチルジシロキサン6.20gを添加し、60℃で3時間反応させ、ポリイミド前駆体であるポリアミック酸溶液を得た。
次いで、前記酸窒化チタン銀一次粒子 12.8質量部、前記ポリイミド前駆体溶液 22.6質量部、N-メチル-2-ピロリドン 30.9質量部、γ-ブチロラクトン 31.7質量部、ガラスビーズ 110.0質量部の組成を有するミルベースを、ナノミルを用いて粉砕分散した。その粉砕分散の処理時間(RT)は7分である。そして、ガラスビーズを瀘過により除去し、それぞれ全量混合することにより黒色粒子を含有する黒色樹脂組成物を調製した。
得られた黒色樹脂組成物中の黒色粒子について、動的光散乱法ナノ粒子解析装置(株式会社堀場製作所製、HORIBA SZ-100)を用いて、測定モードが標準、セルの種類が4面透過セル、分布形態が単分散の設定条件にて、キュムラント法により求められる平均二次粒子径を測定した。得られた数値は244.8nmであり、これは黒色樹脂組成物をN-メチル-2-ピロリドンの溶媒にて0.24質量%黒色粒子濃度に希釈して測定した数値である。
得られた黒色樹脂組成物について、無アルカリガラス(日本電気硝子社製、OA-2、屈折率1.52)基板上にスピナーで塗布、80℃10分熱風乾燥した後、120℃で1時間加熱硬化して、膜厚1.0μmの塗膜が形成された黒色樹脂組成物膜付ガラス基板を作製した。得られた黒色樹脂組成物膜付ガラス基板のガラス面側から通した全反射率を、紫外可視分光光度計(株式会社島津製作所製、UV-2450)を用いて、入射角・反射角ともに5°の設定条件にて測定した。全反射率が5.15%未満の場合を◎、5.15%以上5.35%未満の場合を〇、5.35%以上5.40%未満の場合を△、5.40%以上の場合を×とした。実施例1にて得られた全反射率の値は4.80%と極めて優秀な低反射性能であった。なお、無アルカリガラスによる全反射率は約4.2%であり、測定された全反射率の測定値は無アルカリガラスによる全反射率も含んでいる。
得られた黒色樹脂組成物について、無アルカリガラス(日本電気硝子社製、OA-2)基板上にスピナーで塗布、80℃10分熱風乾燥した後、120℃で1時間加熱硬化して、膜厚1.0μmの塗膜が形成された黒色樹脂組成物膜付ガラス基板を作成した。得られた黒色樹脂組成物膜付ガラス基板のガラス面側から通したOD値を、紫外可視分光光度計(株式会社島津製作所製、UV-2450)を用いて入射角・反射角ともに5°の設定条件にて測定した。OD値が3.10以上の場合を◎、3.00以上3.10未満の場合を〇、2.95以上3.00未満の場合を△、2.95未満の場合を×とした。実施例1にて得られたOD値は3.00と良好な遮光性能であった。
ポリイミド前駆体溶液 22.6部、N-メチル-2-ピロリドン 30.9部、γ-ブチロラクトン 31.7部を混合した樹脂組成物について、無アルカリガラス(日本電気硝子社製、OA-2)基板上にスピナーで塗布、80℃10分熱風乾燥した後、120℃で1時間加熱硬化して、膜厚1.0μmの塗膜を形成した。得られた塗膜の屈折率を、紫外可視分光光度計(株式会社島津製作所製、UV-2450)を用いて測定した。得られた屈折率値は1.52であった。また、前記窒化チタン銀の一次粒子についてカルニュー精密屈折計(KPR接触液(屈折液))を用いて液浸法による屈折率を測定した。得られた屈折率値は1.68であった。
得られた黒色樹脂組成物について、一日放置した後の黒色粒子の沈降具合を目視で確認した。若干黒色粒子が沈降気味の傾向がみられたが、使用には支障のないレベルであった。
得られた黒色樹脂組成物について、無アルカリガラス(日本電気硝子社製、OA-2)基板上にスピナーで塗布、80℃で1分間プリベークした。その後、露光ギャップを80μmに調整し、乾燥塗膜の上にライン/スペース=20μm/20μmのネガ型フォトマスクを被せ、I線照度30mW/cm2の超高圧水銀ランプで100mJ/cm2の紫外線を照射し感光部分の光硬化反応を行った。次に、この露光済み塗板を0.05%水酸化カリウム水溶液中、23℃にて1kgf/cm2圧シャワー現像を行い、パターンが観察された時間を現像抜け時間(BT秒)とし、さらに20秒の現像を行った後、5kgf/cm2圧のスプレー水洗を行い、塗膜の未露光部を除去しガラス基板上に画素パターンを形成し、その後、熱風乾燥機を用いて230℃にて30分間熱ポストベークした。得られたポストベーク後の20μmラインを顕微鏡ならびにSEMで観察し、ギザツキが観測された場合を×、ない場合を○とした。また、ギザツキは観測されないが、表面に突起物が観察され平坦性が低下していたり、膜厚のばらつきが大きい場合は△と判定した。
前記粉砕分散する処理時間(RT)を変更した以外は、実施例1と同様して黒色樹脂組成物を得て、平均二次粒子径を測定した。また、実施例1と同様にして黒色粒子の沈降具合を目視で確認した。また、実施例1と同様にして黒色樹脂組成物の塗膜を形成し、全反射率およびOD値を測定した。その得られた結果を、実施例1も含めて下記表1に示す。
実施例6において、黒色樹脂組成物中の黒色粒子の含有比率(黒色粒子の質量%:樹脂成分の質量%)を複数変化させた以外は、実施例6と同様して黒色樹脂組成物の塗膜を得て、OD値および全反射率を測定し、表2に示した。そして、単位膜厚OD値を横軸にとり、全反射率を縦軸にとってグラフ上にプロットして、得られた結果を「チタンBM」として図1に示した。
前記実施例8の黒色粒子をキャボット社のカーボンブラックTPK-1227Rに変更した以外は、実施例8と同様して黒色樹脂組成物の塗膜を得て、OD値および全反射率を測定し、表2に示した。そして、OD値を横軸にとり、全反射率を縦軸にとってグラフ上にプロットして、得られた結果を「カーボンBM」として図1に示した。
実施例6で得られた黒色樹脂組成物をG4.5(730mm×920mm)のガラス基板上にコンマコーターで塗布、80℃10分熱風乾燥した後、120℃で20分間セミキュアした。その後、ポジ型レジスト(Shipley “Microposit”(登録商標) RC100 30cp )をコンマコーターで塗布後、80℃で20分乾燥した。露光機PLA-501F(キャノン社製)を用い、所定のフォトマスクを介して露光し、アルカリ現像液(Shipley “Microposit”(登録商標)351)でポジ型レジストの現像およびポリイミド前駆体のエッチングを同時に行なった後、ポジ型レジストをメチルセルソルブアセテートで剥離した。さらに、300℃で30分間キュアして、膜厚1.1μmのブラックマトッリクス基板を得た。
おけるOD値は3.16であり、全反射率は5.20であり、色相はx=0.31、y=0.32であつた。したがって、実施例6で得られた黒色樹脂組成物を用いて所望のブラックマトリックスを形成できることがわかった。
実施例4の黒色粒子(比重1.9)に加えて、下記の各透明粒子を黒色樹脂組成物全量に対して0.02質量%添加し、実施例4と同様にして黒色樹脂組成物の塗膜を形成し、全反射率およびOD値を測定した。その得られた結果を、下記表3に示す。また、実施例1と同様にして下記透明粒子の平均二次粒子径を測定し、透明粒子の沈降具合を目視で確認した。
タルク;日本タルク(株)製 ミクロエース P-3
マイカ;日本光研工業(株)製 NK-G/M NK-M
炭酸亜鉛;関西触媒化学(株)製 塩基性炭酸亜鉛
炭酸カルシウム;竹原化学工業(株)製 ホワイトシール WS-3K
フッ化カルシウム;ステラケミファ(株)製 フッ化カルシウムナノ粒子
フッ化マグネシウム;ステラケミファ(株)製 フッ化マグネシウムナノ粒子
フッ化バリウム;ステラケミファ(株)製 フッ化バリウム
シリカ;日産化学(株)製 オルガノシリカゾル NMP-ST
ポリ塩化ビニル;東ソー(株)製 リューロンペースト C38
ポリカーボネート;マテリス(株)製 ポリカ-3Dパウダー
酸化チタン;石原産業(株)製 PT-401M
実施例6で得られた黒色樹脂組成物に代えて、実施例4で得られた黒色樹脂組成物を用いた以外は実施例9と同様にしてブラックマトッリクス基板を得た。得られたブラックマトリックス基板は、平均線幅3.4μmで、最小線幅3.0μm、最大線幅3.9μm、3σ=0.63であり、欠損なく加工できていた。また、得られたブラックマトリックスの遮光性はほとんど波長依存性がなく、波長430~640nmにおけるOD値は3.11であり、全反射率は5.11であり、色相はx=0.30、y=0.31であつた。したがって、実施例4で得られた黒色樹脂組成物を用いても所望のブラックマトリックスを形成できることがわかった。
インクジェット塗布装置を用いて、実施例9および実施例22で得られたブラックマトッリクス基板の開口部に、下記の赤、緑、青の着色インキをモザイク状に充填形成し、カラーフィルタ基板を作製した。得られたカラーフィルタ基板のブラックマトリックス部のOD値および全反射率は、実施例9および実施例22で得られたブラックマトッリクス基板のOD値および全反射率と同じであった。
インクジェット塗布装置を用いて、実施例9および実施例22で得られたブラックマトッリクス基板の開口部に、赤、緑、青の有機EL材料(Merck社製 RGB ink set)をモザイク状に充填形成し、有機ELディスプレイを作製した。得られた有機ELディスプレイのブラックマトリックス部のOD値および全反射率は、実施例9および実施例22で得られたブラックマトッリクス基板のOD値および全反射率と同じであった。
インクジェット塗布装置を用いて、実施例9および実施例22で得られたブラックマトッリクス基板の開口部に、赤、緑、青のマイクロLEDディスプレイ材料(DIC(株)製 量子ドット色変換層用インクジェットインク)をモザイク状に充填形成し、マイクロLEDディスプレイを作製した。得られたマイクロLEDディスプレイのブラックマトリックス部のOD値および全反射率は、実施例9および実施例22で得られたブラックマトッリクス基板のOD値および全反射率と同じであった。
別途用意した市販の有機ELディスプレイおよびマイクロLEDディスプレイの上部に、実施例24で得られたカラーフィルタ基板を載置して、カラーフィルタ基板を具備する有機ELディスプレイおよびカラーフィルタ基板を具備するマイクロLEDディスプレイを作製した。得られた有機ELディスプレイおよびマイクロLEDディスプレイは、上部に載置されたカラーフィルタ基板のブラックマトリックス部のOD値および全反射率が、実施例22で得られたブラックマトッリクス基板のOD値および全反射率と同じであった。
この結果から、マイクロLEDディスプレイや有機ELディスプレイ用途のブラックマトリックスで要求されている性能の反射率およびOD値が得られることがわかった。
2:透明基材
3:黒色粒子
4:透明粒子
Claims (8)
- 平均二次粒子径が190~245nmであり、組成式:TiNxOy・zX(式中、Xは金属原子、xは0より大きく2未満の数、yは0以上2未満の数、zは0以上10未満の数を表す)で表される黒色粒子と、樹脂成分とを含有する黒色樹脂組成物。
- 前記黒色粒子の平均二次粒子径が、202~233nmである請求項1に記載の黒色樹脂組成物。
- 前記黒色粒子の比重に対して0.7~2.5倍の比重の透明粒子をさらに含有する請求項1または2に記載の黒色樹脂組成物。
- 前記透明粒子が、硫酸バリウム、タルク、マイカ、炭酸亜鉛、炭酸カルシウム、フッ化カルシウム、フッ化マグネシウムおよびフッ化バリウムのいずれかである請求項3に記載の黒色樹脂組成物。
- 透明基材上に請求項1または2に記載の黒色樹脂組成物の硬化物がマトリックス状にパターン形成されてなるブラックマトリックス基板であって、前記透明基材表面側から測定したブラックマトリックスの全反射率が5%以下であって、OD値が3.0以上であるブラックマトリックス基板。
- 請求項5に記載のブラックマトリックス基板の開口部に着色層が形成されてなるカラーフィルタ基板。
- 請求項5に記載のブラックマトリックス基板の開口部にマイクロLEDまたは有機EL材料を具備するマイクロLEDディスプレイまたは有機ELディスプレイ。
- 請求項6に記載のカラーフィルタ基板を具備するマイクロLEDディスプレイまたは有機ELディスプレイ。
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| JPS62177035A (ja) * | 1986-01-31 | 1987-08-03 | Toray Ind Inc | 2軸配向フイルム |
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| KR101452233B1 (ko) * | 2011-03-25 | 2014-10-22 | 도레이 카부시키가이샤 | 흑색 수지 조성물, 수지 블랙 매트릭스 기판 및 터치패널 |
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| JPS62177035A (ja) * | 1986-01-31 | 1987-08-03 | Toray Ind Inc | 2軸配向フイルム |
| WO2014136738A1 (ja) * | 2013-03-07 | 2014-09-12 | 東レ株式会社 | ブラックマトリクス基板 |
| JP2019151786A (ja) * | 2018-03-06 | 2019-09-12 | 東レ・ファインケミカル株式会社 | 黒色顔料分散液 |
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