TW202319422A - Metal oxide dispersion, film composiotion for display and optical member for display - Google Patents

Abstract

The present invention relates to a metal oxide dispersion liquid, a thin film composition for a display, and an optical element for a display. The metal oxide dispersion liquid according to one embodiment of the present invention comprises: zirconia nanoparticles; a monomer; and a surface modifier. The zirconia nanoparticles have a tetragonal full width at half maximum (FWHM) of 0.9 or more and a monoclinic full width at half maximum (FWHM) of 0.7 or more.

Description

Metal oxide dispersion, thin film composition for display, and optical element for display

The present invention relates to a metal oxide dispersion liquid, a thin film composition for a display, and an optical element for a display.

Optically transparent polymer materials are widely used in optical coatings and optoelectronic materials because of their low cost, good processability, and high transmittance of visible light. However, it is difficult to achieve high refractive index only through polymer materials, so it is actively developing A method of mixing and dispersing high refractive index metal oxide particles into a polymer.

In order to achieve high brightness, high contrast and low power consumption of displays, organic-inorganic hybrid materials with high refractive index metal oxide particles will be used as transparent materials for displays, which is expected to be more widely used in the future.

However, organic-inorganic hybrid materials with high refractive index metal oxide particles can increase the refractive index through metal oxide particles, but at the same time reduce light transmittance, haze, yellowness (yellow index; Y.I.), etc. Optical properties are limited when used as a display material.

In order to solve this problem, many technologies are studying how to improve yellowness while maintaining physical properties such as refractive index and viscosity. These technologies usually change the synthesis method of inorganic substances or use a large amount of additives, and there are problems affecting other physical properties.

Therefore, there is a need for a technique for preparing a dispersion of metal oxide particles, which can improve the yellowness of organic-inorganic hybrid materials with high refractive metal oxide particles without affecting other physical properties.

The content of the above-mentioned background technology is the content mastered or acquired by the inventor during the process of developing the present invention, and should not be interpreted as necessarily the generally known technology disclosed before the application of the present invention.

[Problem to be solved by the invention]

The present invention is used to solve the above problems, and provides a metal oxide dispersion, a film composition for a display, and an optical element for a display, which can achieve high refractive index and low yellowness by adjusting the crystal phase mixing ratio of zirconia nanoparticles.

The technical problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description. [Technical means to solve the problem]

The metal oxide dispersion liquid according to an embodiment of the present invention may include: zirconia nanoparticles; a monomer; and a surface modifier, the full width at half maximum (full width at half maximum) of the tetragonal system of the zirconia nanoparticles , FWHM) is 0.9 or more, and the monoclinic full width at half maximum is 0.7 or more.

According to an embodiment, the crystal size of the zirconia nanoparticles may be less than 10 nm.

； [公式2]

；以及

：單斜晶系的體積分數

：對於

面的峰的單斜晶系強度

：對於

面的峰的四方晶系強度 [公式3]

：四方晶系的體積分數。 According to an embodiment, the volume fraction (Vm) of the monoclinic system calculated by the following formula 1 and formula 2 may be 30% to 40%, and the volume fraction (Vm) of the tetragonal system calculated by the following formula 3 The volume fraction (Vt) can be 60% to 70%, [Equation 1]

; [Formula 2]

;as well as

: volume fraction of monoclinic system

:for

monoclinic intensity of the peak of the face

:for

The tetragonal intensity of the peak of the face [Equation 3]

: volume fraction of the tetragonal system.

According to an embodiment, the zirconia nanoparticles may be 40% to 70% by weight in the metal oxide dispersion.

According to one embodiment, the monomer may comprise methyl acrylate, lauryl acrylate, ethoxydiethylene glycol acrylate, methoxytriethylene glycol acrylate, phenoxyethyl acrylate, tetrahydrofurfuryl acrylate , Isobornyl Acrylate, 2-Hydroxyethyl Acrylate, 2-Hydroxypropyl Acrylate, 2-Hydroxy-3-Phenoxy Acrylate, Neopentyl Glycol Diacrylate, 1,6-Hexanediol Diacrylate , Trimethylolpropane Triacrylate, Pentaerythritol Triacrylate, Pentaerythritol Tetraacrylate, Dipentaerythritol Hexaacrylate, Trimethylolpropane Acrylate Benzoate, Trimethylolpropane Benzoate, Methacrylic Acid Methyl ester, 2-ethylhexyl methacrylate, octadecyl methacrylate, cyclohexyl methacrylate, tetrahydrofurfuryl methacrylate, phenoxyethyl methacrylate, methoxypolyethylene Methacrylate, 2-Hydroxyethyl Methacrylate, 2-Hydroxybutyl Methacrylate Heptadecafluorodecyl Methacrylate, Trifluoromethyl Methacrylate, Trifluoroethyl Acrylate, Hexafluoromethacrylate Propyl ester, 1,6-hexanediol dimethacrylate, trimethylolpropane trimethacrylate, glycerol dimethacrylate, hexamethylene diisocyanate, ethylene glycol dimethacrylate, polyurethane Acrylate, epoxy acrylate, melamine acrylate, benzyl acrylate, benzyl methacrylate, phenyl acrylate, diphenyl acrylate, biphenyl acrylate, 2-biphenyl acrylate, 2-([1,1 '-biphenyl]-2-oxy)ethyl acrylate, phenoxybenzyl acrylate, 3-phenoxybenzyl-3-(1-naphthyl)acrylate, ethyl(2E)-3- Hydroxy-2-(3-phenoxybenzyl)acrylate, phenyl methacrylate, biphenyl methacrylate, 2-nitrophenyl acrylate, 4-nitrophenyl acrylate, 2-nitromethacrylate phenyl methacrylate, 4-nitrobenzyl methacrylate, 2-nitrobenzyl methacrylate, 4-nitrobenzyl methacrylate, 2-chlorophenyl acrylate, 4-chlorophenyl Acrylates, 2-Chlorophenyl Methacrylate, 4-Chlorophenyl Methacrylate, o-Phenylphenol Ethyl Acrylate, Phenol, Biphenyl Methacrylate, o-Phenylphenol Ethoxyacrylate, 1-(biphenyl-2-ylmethyl)-4-phenylpiperazine, 1-(biphenyl-2-ylmethyl)-4-(2-methoxyphenyl)piperazine, 1-( Biphenyl-2-ylmethyl)-4-(2-ethoxyphenyl)piperazine, 1-(biphenyl-2-ylmethyl)-4-(2-isopropoxyphenyl)piperazine Azine, 1-(biphenyl-2-ylmethyl)-4-(3-methoxyphenyl)piperazine, 1-(biphenyl-2-ylmethyl)-4-(4-methoxy At least one selected from the group consisting of phenyl)piperazine and bisphenol diacrylate.

According to an embodiment, the monomer may be 1 wt % to 50 wt % in the metal oxide dispersion.

According to one embodiment, the surface modifier may include a silane coupling agent, and the silane coupling agent may be composed of an acrylate group, a (meth)acrylic group, an epoxy group (epoxy), an alkoxy group (alkoxy), vinyl (vinyl), phenyl (phenyl), methacryloxy (methacryloxy), amino (amino), chlorosilyl (chlorosilanyl), chloropropyl (chloropropyl) and mercapto (mercapto) At least one silane selected from the group of .

According to one embodiment, the surface modifier may include γ-methacryloxypropyltrimethoxysilane, 4-aminobutylmethyldiethoxysilane, 3-aminopropyltrimethoxysilane , N-2-aminoethyl-3-aminopropyldiethylisopropoxysilane, (mercaptomethyl)dimethylethoxysilane, two-4-mercaptobutyldimethoxysilane, 3 -Mercaptopropyltriisopropoxysilane, 3-methacryloxypropyldimethylethoxysilane, 3-acryloxypropyltrimethoxysilane, (3-glycidyloxypropyl base) methyldimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-chloropropyltrimethoxysilane, 4-bromobutylmethyldibutoxysilane, 5-Iodohexyldiethylmethoxysilane, 3-isocyanatepropyltrimethoxysilane, 3-isothiocyanatepropylmethyldimethoxysilane, 3-hydroxybutylisopropyldimethoxysilane Bis(2-hydroxyethyl)-3-aminopropyltriethoxysilane, bromophenyltrimethoxysilane, (2-(iodophenyl)ethyl)ethyldimethoxysilane, Bis(chloromethylphenyl)dimethoxysilane, bromomethylphenyldimethylisopropoxysilane, bis(propyltrimethoxysilane)carbodiimide, N-ethyl-N-( Propylethoxydimethoxysilane)-carbodiimide, 3-(trimethoxysilyl)propanol, (3,5-hexanedione)triethoxysilane, 3-(trimethoxy 3-(trimethoxysilyl)propyl methacrylate silane, 3-aminopropyltrimethoxysilane, 2-aminopropyltrimethoxysilane , N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-ureapropyltrimethoxysilane Oxysilane, N-ethoxycarbonyl-3-aminopropyltrimethoxysilane, N-triethoxysilylpropyltriethylenetriamine, N-trimethoxysilylpropyltriethylenetriamine Triamine, 10-trimethoxysilyl-1,4,7-triazoldecane, 10-triethoxysilyl-1,4,7-triazoldecane, 9-trimethoxy Silyl-3,6-nonyl azoacetate, 3-(triethoxysilyl)propyl succinic anhydride, N-benzyl-3-aminopropyltrimethoxysilane, N-phenyl- At least any one selected from the group consisting of 3-aminopropyltrimethoxysilane, N-dioxyethylene-3-aminopropyltrimethoxysilane and (methacryloxy)propyltrimethoxysilane A sort of.

According to an embodiment, the surface modifier may be 1% to 50% by weight in the metal oxide dispersion.

According to one embodiment, the metal oxide dispersion may further include a dispersant, and the dispersant includes polyether acid compounds, polyether amine compounds, polyether acid/amine mixtures, and esters containing phosphoric acid groups. At least one selected from the group consisting of compounds and polyether compounds including phosphoric acid groups.

According to one embodiment, the metal oxide dispersion may be a solvent-free type.

According to an embodiment, the metal oxide dispersion may have a viscosity of 200 cP to 50,000 cP.

According to one embodiment, the metal oxide dispersion may have a refractive index of 1.60 or more.

According to an embodiment, the yellowness (Yellow Index; Y.I) of the metal oxide dispersion liquid may be 30 or less, and the haze (Haze) may be 20% or less.

A film composition for a display according to another embodiment of the present invention includes: the metal oxide dispersion according to an embodiment of the present invention; a UV photoinitiator; and a UV curing monomer.

According to one embodiment, the UV photoinitiator may include at least any one selected from the group consisting of cationic photoinitiators and free radical photoinitiators, wherein the cationic photoinitiator is selected from onium salts , diazonium salts, permeate compounds and imidazoles; the free radical photoinitiator is selected from thioxanthones, phosphorus, triazines, benzophenones, benzoin, oximes, acetone Classes, amino ketones, ketones, benzoin ether acetophenones, anthraquinones and aromatic phosphine oxides.

According to one embodiment, the UV curing monomer may comprise glycidyl acrylate, glycidyl methacrylate, glycidyl methacrylate, glycidyl-α-ethyl acrylate, glycidyl-α-n- Propyl acrylate, glycidyl-α-butyl acrylate, 3,4-epoxybutyl methacrylate, 3,4-epoxybutyl acrylate, 6,7-epoxyheptyl methyl methacrylate, 6 ,7-Epoxyheptyl Acrylate, 6,7-Epoxyheptyl-α-Ethyl Acrylate, 2-Hydroxypropyl Acrylate, 2-Hydroxyethyl Acrylate, Tetrahydrofurfuryl Acrylate, Isobornyl Acrylate , 2-hydroxyethyl methacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, 1,6-hexanediol diacrylate and trimethylolpropane triacrylate. A sort of.

An optical film according to another embodiment of the present invention includes a cured product of the dispersion composition for a display according to an embodiment of the present invention.

An optical element for a display according to another embodiment of the present invention includes the diffusion film of one embodiment of the present invention. [Effect of the invention]

According to an embodiment of the present invention, the metal oxide dispersion liquid is prepared by adjusting the volume fraction of the mixed crystal phase of zirconia nanoparticles to prepare a mixed dispersion liquid of acrylate monomers with low yellowness and high refractive index. Zirconia nanoparticles having a crystal structure with an adjusted mixing ratio can determine the full width at half maximum and crystal size of the crystal structure based on the mixing ratio. In addition, the metal oxide dispersion has excellent dispersibility of zirconia particles, excellent fluidity and formability due to its low viscosity, and can be used as a device, that is, as a sol dispersion for a display to improve the efficiency of a display device.

The diffusion film and the optical element for a display according to an embodiment of the present invention can be used to manufacture a diffusion film for backlight units of mobile phones, tablet computers, PDPs, notebook computers, display screens, and TVs.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. It should be understood that various changes can be made to the embodiments, and the scope of rights of the present application is not limited to the following embodiments. All changes made to the embodiments, their equivalents and even their substitutes belong to the right scope of the present invention.

The terminology used in the embodiments is used to describe particular embodiments only and not to limit the scope. Unless otherwise specified in the content, a singular expression includes a plural meaning. In this specification, terms such as "comprising" or "having" are used to express the presence of features, numbers, steps, operations, constituent elements, accessories or combinations thereof described in the specification, and do not exclude the existence or addition of one or more Possibility of other features, numbers, steps, operations, constituent elements, accessories or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the usual meanings understood by those of ordinary skill in the art. Commonly used terms such as those defined in dictionaries should be understood as meanings in relevant technical content, and should not be interpreted as idealized or overly formalized meanings if they are not clearly defined in this specification.

In addition, in the description with reference to the drawings, the same reference numerals are used for the same constituent elements regardless of the reference numerals, and repeated descriptions are omitted. In explaining the embodiments, when it is judged that specific descriptions of related well-known technologies will unnecessarily obscure the embodiments, the detailed descriptions thereof are omitted.

In addition, terms such as first, second, A, B, (a), and (b) may be used when describing components of the embodiments. These terms are used only to distinguish one constituent element from other constituent elements, and are not used to limit the nature or order of the corresponding constituent elements, etc.

When a constituent element has a common function with a constituent element of a certain embodiment, the same name is also used to describe the constituent element in other embodiments. The description of a certain embodiment can be applied to other embodiments unless there is mention of a counter-example, and the specific description of the repeated content will be omitted.

The metal oxide dispersion liquid according to an embodiment of the present invention includes zirconia nanoparticles; a monomer; and a surface modifier, the full width at half maximum (full width at half maximum, FWHM) of the tetragonal system of the zirconia nanoparticles It may be 0.9 or more, and the monoclinic full width at half maximum may be 0.7 or more.

Fig. 1 is a diagram illustrating the crystal structure and density of ordinary zirconia particles.

Referring to FIG. 1 , ordinary zirconia particles have three crystal phases: monoclinic, tetragonal, and cubic, depending on the three crystal axes a, b, and c that form the crystal.

The monoclinic crystal phase remains stable until 1400K, the tetragonal crystal phase is from 1170K to 2640K, and the cubic crystal phase is between the higher temperature and the melting point. The theoretical density is shown in the attached figure.

The metal oxide dispersion liquid according to an embodiment of the present invention includes a structure in which tetragonal crystal system and monoclinic crystal system are mixed in the mixed crystal phase of nano-zirconia.

The metal oxide dispersion according to an embodiment of the present invention can provide yellowness by adjusting the volume fraction of tetragonal (2θ=30.119°) and monoclinic (2θ=28.217°) in the mixed crystal phase of nano-zirconia (Y.I) Low, high refractive index dispersion.

FIG. 2 is a diagram illustrating measurement of the crystal size of the crystal structure of zirconia nanoparticles according to an example of the present invention.

According to one embodiment, the zirconia nanoparticle crystallite size is the average of all zirconia nanoparticles in all metal oxide dispersions, as shown by the crystallite size in FIG. 2 . A representative sample of the metal oxide dispersion can be collected and scanned electron microscopy (SEM) can be used to measure the crystal size of the zirconia nanoparticles.

According to an embodiment, the crystal size of the zirconia nanoparticles may be less than 10 nm. When the D ₅₀ average crystal size of the zirconia particles exceeds 10 nm, scattering occurs or agglomeration or precipitation occurs, which leads to unacceptable appearance of the coating and lowers the refractive index.

； [公式2]

；以及

：單斜晶系的體積分數

：對於

面的峰的單斜晶系強度

：對於

面的峰的四方晶系強度 [公式3]

：四方晶系體積分數 According to an embodiment, the volume fraction (Vm) of the monoclinic system (2θ=28.217°) calculated by the following formula 1 and formula 2 may be 30% to 40%; calculated by the following formula 3 The volume fraction (Vt) of the tetragonal system (2θ=30.119°) may be 60% to 70%. [Formula 1]

; [Formula 2]

;as well as

: volume fraction of monoclinic system

:for

monoclinic intensity of the peak of the face

:for

The tetragonal intensity of the peak of the face [Equation 3]

: Tetragonal volume fraction

Preferably, the volume fraction (Vm) of the monoclinic system may be 34% to 40%, or 36% to 40%; the volume fraction (Vt) of the tetragonal system may be 60% to 65%, or 60% to 63%, by adjusting the volume fraction of the mixed crystal phase of the zirconia particles, the yellowness can be reduced while achieving a high refractive index.

According to an embodiment, the zirconia nanoparticles may be 40% to 70% by weight in the metal oxide dispersion. When it is less than 40% by weight in the metal oxide dispersion, the brightness of the curable composition will be reduced, which will reduce the optical properties of the cured film produced in the subsequent process; The dispersion interval between nanoparticles narrows rapidly, causing the viscosity of the dispersion to rise excessively and the aggregation of zirconia nanoparticles to occur.

Preferably, the zirconia nanoparticles may be 50% to 70% by weight, 60% to 70% by weight, 40% to 60% by weight, 50% to 60% by weight in the metal oxide dispersion % or 40% to 50% by weight.

According to one embodiment, the monomers may include C1 to C22 alkyl acrylate monomers, C1 to C22 alkoxy acrylate monomers, C6 to C24 aryl acrylate monomers, C1 to C22 alkyl Base (meth)acrylate monomer, C1 to C22 alkoxy (meth)acrylate monomer, C6 to C24 aryl (meth)acrylate monomer, alkylene glycol di(meth)acrylate base) acrylate monomers, alkylene glycol diacrylate monomers, alkylene glycol alkyl ether (meth) acrylate monomers, alkylene glycol alkyl ether acrylate monomers At least one selected from the group consisting of methacrylate and/or acrylate substituent derivatives.

And, the molecule of the monomer is again substituted by at least one of a hydroxyl group, an aliphatic ring and an aromatic ring (6 to 30 carbons), and the "alkylene group" has 1 to 10 carbons, including 1 to 20 (n ), the "alkyl ether" may include an alkyl group of 1 to 20 carbons. The monomer may include 1 to 6 functional acrylates, such as difunctional, trifunctional, and the like.

According to one embodiment, the monomer may comprise methyl acrylate, lauryl acrylate, ethoxydiethylene glycol acrylate, methoxytriethylene glycol acrylate, phenoxyethyl acrylate, tetrahydrofurfuryl acrylate , Isobornyl Acrylate, 2-Hydroxyethyl Acrylate, 2-Hydroxypropyl Acrylate, 2-Hydroxy-3-Phenoxy Acrylate, Neopentyl Glycol Diacrylate, 1,6-Hexanediol Diacrylate , Trimethylolpropane Triacrylate, Pentaerythritol Triacrylate, Pentaerythritol Tetraacrylate, Dipentaerythritol Hexaacrylate, Trimethylolpropane Acrylate Benzoate, Trimethylolpropane Benzoate, Methacrylic Acid Methyl ester, 2-ethylhexyl methacrylate, octadecyl methacrylate, cyclohexyl methacrylate, tetrahydrofurfuryl methacrylate, phenoxyethyl methacrylate, methoxypolyethylene Methacrylate, 2-Hydroxyethyl Methacrylate, 2-Hydroxybutyl Methacrylate Heptadecafluorodecyl Methacrylate, Trifluoromethyl Methacrylate, Trifluoroethyl Acrylate, Hexafluoromethacrylate Propyl ester, 1,6-hexanediol dimethacrylate, trimethylolpropane trimethacrylate, glycerol dimethacrylate, hexamethylene diisocyanate, ethylene glycol dimethacrylate, polyurethane Acrylate, epoxy acrylate, melamine acrylate, benzyl acrylate, benzyl methacrylate, phenyl acrylate, diphenyl acrylate, biphenyl acrylate, 2-biphenyl acrylate, 2-([1,1 '-biphenyl]-2-oxy)ethyl acrylate, phenoxybenzyl acrylate, 3-phenoxybenzyl-3-(1-naphthyl)acrylate, ethyl(2E)-3- Hydroxy-2-(3-phenoxybenzyl)acrylate, phenyl methacrylate, biphenyl methacrylate, 2-nitrophenyl acrylate, 4-nitrophenyl acrylate, 2-nitromethacrylate phenyl methacrylate, 4-nitrobenzyl methacrylate, 2-nitrobenzyl methacrylate, 4-nitrobenzyl methacrylate, 2-chlorophenyl acrylate, 4-chlorophenyl Acrylates, 2-Chlorophenyl Methacrylate, 4-Chlorophenyl Methacrylate, o-Phenylphenol Ethyl Acrylate, Phenol, Biphenyl Methacrylate, o-Phenylphenol Ethoxyacrylate, 1-(biphenyl-2-ylmethyl)-4-phenylpiperazine, 1-(biphenyl-2-ylmethyl)-4-(2-methoxyphenyl)piperazine, 1-( Biphenyl-2-ylmethyl)-4-(2-ethoxyphenyl)piperazine, 1-(biphenyl-2-ylmethyl)-4-(2-isopropoxyphenyl)piperazine Azine, 1-(biphenyl-2-ylmethyl)-4-(3-methoxyphenyl)piperazine, 1-(biphenyl-2-ylmethyl)-4-(4-methoxy At least one selected from the group consisting of phenyl)piperazine and bisphenol diacrylate.

According to an embodiment, the monomer may be 1 wt % to 50 wt % in the metal oxide dispersion. When included within the stated range, the dispersibility of the metal oxide can be improved, the curing performance in subsequent processes can be improved, and a coating with high refractive index and flexibility can be provided.

Preferably, the monomer may be 50% to 70% by weight, 60% to 70% by weight, 40% to 60% by weight, 50% to 60% by weight or 40% to 50% by weight.

According to one embodiment, when the surface modifier is included in the range, the metal oxide sol dispersion will oxidize Zirconium particles are efficiently dispersed into the sol dispersion. Thereby, even if a high concentration of zirconia particles is filled in the metal oxide dispersion liquid of the present invention, stable dispersibility can be ensured, and a metal oxide sol maintaining high transparency can be prepared.

According to one embodiment, the surface modifying agent includes a silane coupling agent, which may be composed of acrylate groups, (meth)acrylic groups, epoxy groups (epoxy), alkoxy groups ( alkoxy), vinyl, phenyl, methacryloxy, amino, chlorosilanyl, chloropropyl and mercapto at least one silane selected from the group.

According to one embodiment, the surface modifier may include γ-methacryloxypropyltrimethoxysilane, 4-aminobutylmethyldiethoxysilane, 3-aminopropyltrimethoxysilane , N-2-aminoethyl-3-aminopropyldiethylisopropoxysilane, (mercaptomethyl)dimethylethoxysilane, two-4-mercaptobutyldimethoxysilane, 3 -Mercaptopropyltriisopropoxysilane, 3-methacryloxypropyldimethylethoxysilane, 3-acryloxypropyltrimethoxysilane, (3-glycidyloxypropyl base) methyldimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-chloropropyltrimethoxysilane, 4-bromobutylmethyldibutoxysilane, 5-Iodohexyldiethylmethoxysilane, 3-isocyanatepropyltrimethoxysilane, 3-isothiocyanatepropylmethyldimethoxysilane, 3-hydroxybutylisopropyldimethoxysilane Bis(2-hydroxyethyl)-3-aminopropyltriethoxysilane, bromophenyltrimethoxysilane, (2-(iodophenyl)ethyl)ethyldimethoxysilane, Bis(chloromethylphenyl)dimethoxysilane, bromomethylphenyldimethylisopropoxysilane, bis(propyltrimethoxysilane)carbodiimide, N-ethyl-N-( Propylethoxydimethoxysilane)-carbodiimide, 3-(trimethoxysilyl)propanol, (3,5-hexanedione)triethoxysilane, 3-(trimethoxy 3-(trimethoxysilyl)propyl methacrylate silane, 3-aminopropyltrimethoxysilane, 2-aminopropyltrimethoxysilane , N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-ureapropyltrimethoxysilane Oxysilane, N-ethoxycarbonyl-3-aminopropyltrimethoxysilane, N-triethoxysilylpropyltriethylenetriamine, N-trimethoxysilylpropyltriethylenetriamine Triamine, 10-trimethoxysilyl-1,4,7-triazoldecane, 10-triethoxysilyl-1,4,7-triazoldecane, 9-trimethoxy Silyl-3,6-nonyl azoacetate, 3-(triethoxysilyl)propyl succinic anhydride, N-benzyl-3-aminopropyltrimethoxysilane, N-phenyl- At least any one selected from the group consisting of 3-aminopropyltrimethoxysilane, N-dioxyethylene-3-aminopropyltrimethoxysilane and (methacryloxy)propyltrimethoxysilane A sort of.

According to an embodiment, the surface modifier may be 1% to 50% by weight in the metal oxide dispersion. When the surface modifying agent is less than 1% by weight in the metal oxide dispersion, the dispersibility of the zirconia nanoparticles in the dispersion composition will be reduced, resulting in white turbidity; when more than 50% by weight When the silane compound is too much bound to the surface of the zirconia nanoparticles, interparticle aggregation will occur, which will bring about the problem of increasing the viscosity.

When the surface modifier is included in the range, the dispersibility of the zirconia particles in the dispersion liquid composition can be improved while properly maintaining the surface treatment reaction speed of the zirconia particles, and excessive addition can be effectively prevented. The surface treatment agent adheres to the surface of zirconia particles and causes aggregation between zirconia particles, which ultimately reduces the dispersibility.

According to one embodiment, the metal oxide dispersion liquid further includes a dispersant, and the dispersant may include polyether acid compounds, polyether amine compounds, polyether acid/amine mixtures, esters containing phosphoric acid groups At least one selected from the group consisting of compounds and polyether compounds including phosphoric acid groups.

According to one embodiment, when the dispersant is less than 1% by weight, it will be difficult to be compatible with the resin composition composed of organic compounds in the subsequent process; when it exceeds 20% by weight, the dispersant will be excessively bonded to the zirconia particles The surface causes a decrease in the refractive index.

According to an embodiment, the metal oxide dispersion liquid may further include an organic solvent, which is helpful for dispersion, and may be 30% to 50% by weight. For subsequent processing, the solvent can be (almost) completely removed to form a solvent-free sol dispersion.

According to one embodiment, when the organic solvent is less than 30% by weight in the metal oxide dispersion, the dispersibility, viscosity and optical properties will be affected because the minimum range of the function of the dispersion medium cannot be reached; when When it exceeds 50% by weight, the time for removing the solvent will be increased, the refractive index and brightness of the optical film made of the metal oxide dispersion liquid will be reduced, the light transmittance of the cured film will be reduced, and the haze will be increased.

According to one embodiment, the metal oxide dispersion may be a solvent-free type.

According to an embodiment, the metal oxide dispersion may have a viscosity of 200 cP to 50,000 cP. Preferably, the metal oxide dispersion may have a viscosity of 200 cP to 40,000 cP; 200 cP to 30,000 cP; 200 cP to 20,000 cP; 200 cP to 10,000 cP; 50,000 cP; 30,000 cP to 50,000 cP; 20,000 cP to 50,000 cP; 20,000 cP to 40,000 cP; 20,000 cP to 30,000 cP; Dispersion can be without Solvent type, can be sol dispersion. When the viscosity is high, it will be difficult to form a liquid with the organic material, and the dispersibility of the zirconia particles in the dispersion liquid will be reduced, making it difficult to form a uniform film layer when manufacturing a film, resulting in a decrease in optical performance. Viscosity can be measured using a DV2T LV spindle (manufactured by Brookfield). In addition, the viscosity may be measured at a temperature of 25° C. and a shear rate of 1.0 (1/s).

According to an embodiment, the metal oxide dispersion may have a refractive index of 1.60 or more than 1.670. In this way, it can be better compatible with the components or compositions used together in the subsequent process, forming a coating with high brightness efficiency, high light transmittance and high refractive index.

According to an embodiment, the yellowness (Yellow Index; Y.I) of the metal oxide dispersion liquid may be 30 or less, and the haze (Haze) may be 20% or less.

The metal oxide dispersion liquid according to an embodiment of the present invention includes zirconia nanoparticles having a crystal structure with an adjusted mixing ratio, whereby the full width at half maximum and the crystal size of the crystal structure can be determined according to the mixing ratio, and when combined with a high refractive index When the acrylate-based monomer mixed dispersion has the same content of zirconia, the yellowness in the optical properties can be improved.

The thin film composition for display according to another embodiment of the present invention includes the metal oxide dispersion liquid according to one embodiment of the present invention; a UV photoinitiator; and a UV curing monomer.

According to one embodiment, the UV photoinitiator may include a cationic photoinitiator, a free radical photoinitiator, or both.

According to one embodiment, the UV photoinitiator may include at least any one selected from the group consisting of cationic photoinitiators and free radical photoinitiators: wherein, the cationic photoinitiators are selected from onium salts, heavy Choose from nitrogen salts, permeic acid compounds and imidazoles; free radical photoinitiators from thioxanthones, phosphorus, triazines, benzophenones, benzoin, oximes, acetones, aminoketones Classes, ketones, benzoin ether acetophenones, anthraquinones and aromatic phosphine oxides.

According to one embodiment, the UV photoinitiator may be 2 wt % to 5 wt % in the display film composition. When the UV photoinitiator is less than 2% by weight in the film composition for display, the film composition cannot be fully cured, so it is difficult to obtain suitable hardness; when it exceeds 5% by weight, due to curing shrinkage, the Problems such as cracks and peeling may occur after film formation.

According to an embodiment, the UV curing monomer may include an acrylate resin. The acrylate resin is a saturated hydrocarbon polymer without double bonds in the molecule, and its inherent property has excellent oxidation resistance, so it has excellent weather resistance.

According to an embodiment, the UV curing monomer may comprise glycidyl acrylate, glycidyl methacrylate, glycidyl methacrylate, glycidyl-α-ethyl acrylate, glycidyl-α-n- Propyl acrylate, glycidyl-α-butyl acrylate, 3,4-epoxybutyl methacrylate, 3,4-epoxybutyl acrylate, 6,7-epoxyheptyl methyl methacrylate, 6 ,7-Epoxyheptyl Acrylate, 6,7-Epoxyheptyl-α-Ethyl Acrylate, 2-Hydroxypropyl Acrylate, 2-Hydroxyethyl Acrylate, Tetrahydrofurfuryl Acrylate, Isobornyl Acrylate , 2-hydroxyethyl methacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, 1,6-hexanediol diacrylate and trimethylolpropane triacrylate. A sort of.

According to one embodiment, the film composition for a display of the present invention may further include an acrylic resin.

According to one embodiment, the acrylic resin may include hydroxyethyl acrylate (HEA), hydroxyethyl methacrylate (HEMA), hexanediol diacrylate (HDDA), tripropylene glycol diacrylate (TPGDA) , Ethylene Glycol Diacrylate (EGDA), Trimethylolpropane Triacrylate (TMPTA), Trimethylolpropane Ethoxylated Triacrylate (TMPEOTA), Glycerin Propoxylated Triacrylate (GPTA), Pentaerythritol tetraacrylate (PETA), benzyl methacrylate, phenyl acrylate, diphenyl acrylate, biphenyl acrylate, 2-biphenyl acrylate, 2-([1,1'-biphenyl]-2- oxy)ethyl acrylate, phenoxybenzyl acrylate, 3-phenoxybenzyl-3-(1-naphthyl)acrylate, phenyl methacrylate, biphenyl methacrylate, 2-nitro At least any one selected from the group consisting of phenyl phenyl acrylate, phenyl 4-nitroacrylate, phenyl 2-nitromethacrylate, phenyl 4-nitromethacrylate and dipentaerythritol hexaacrylate (DPHA). A sort of.

The film composition according to an embodiment of the present invention has a high refractive index, and can improve yellowing of the film.

An optical film according to another embodiment of the present invention includes a cured product of the dispersion composition for a display according to one embodiment of the present invention.

According to one embodiment, a base material is prepared, and the dispersion liquid composition for a display according to an embodiment of the present invention is laminated or coated on the base material and subjected to UV curing to form a coating to produce a cured product.

According to one embodiment, the optical film may include a substrate; and a coating (film, thin film, etc.) prepared from the dispersion composition for displays of the present invention formed on at least a part of the substrate. When manufacturing the optical film, the metal oxide dispersion or the composition including the metal oxide dispersion can form a coating with only a small amount of solvent or almost no solvent or in a process solvent-free (solvent-free) state.

According to one embodiment, the substrate can be appropriately selected according to the application of the optical film, and may be a transparent substrate. The transparent substrate is not particularly limited as long as it is a transparent film. It can be polyester fiber (polyester) such as polyethylene terephthalate (PET), polyethylene (polyethylene) such as ethylene vinyl acetate (EVA), cycloolefin polymer (cyclic Olefin polymer, COP), cyclic olefin copolymer (COC), polyacrylate (polyacrylate, PAC), polycarbonate (polycarbonate, PC), polyethylene (polyethylene, PE), polymethyl methacrylate (polymethylmethacrylate, PMMA), polyether ether ketone (polyetheretherketon, PEEK), polyethylene naphthalate (polyethylenenaphthalate, PEN), polyetherimide (polyetherimide, PEI), polyimide (polyimide, PI) , triacetylcellulose (triacetylcellulose, TAC), methyl methacrylate (methyl methacrylate, MMA), or a thin film of fluororesin, etc., and may be a flexible inorganic substrate.

According to one embodiment, the coating method may include gravure coating, indirect gravure coating, 2 to 3 roll pressure coatings, 2 to 3 reverse roll coatings (roll reverse coating), dip coating, 1 to 2 roll kiss coating, trailing balde coating, nip coating, flexographic coating, inverted knife coating At least any one selected from the group consisting of inverted knife coating, polishing bar coating, and wire wound doctor coating. After coating, the coating is cured by UV light, and the curing process is maintained for 10 seconds to 1 hour.

The diffusion film according to an embodiment of the present invention can be used for a diffusion film required for backlight units of mobile phones, tablet computers, PDPs, notebook computers, display screens, and TVs.

An optical element for a display according to still another embodiment of the present invention includes the diffusion film of one embodiment of the present invention.

According to one embodiment, the optical element for a display can be used as an optical element of a backlight unit of a mobile phone, a tablet computer, a PDP, a notebook computer, a display screen, or a TV.

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples.

However, the following examples are only for illustrating the present invention, and the content of the present invention is not limited to the following examples.

[Comparative example 1]

Zirconia nanoparticles are synthesized by a hydrothermal synthesis method. At this time, the synthesized zirconia particles have a mixed structure of tetragonal crystal system and monoclinic crystal system. In the crystal phase of the zirconia particles, the volume fraction of the tetragonal structure was 46.5%, the crystal size was 12.6 nm, and the FWHM was 0.659. The volume fraction of the monoclinic structure is 56.5%, the crystal size is 15.3nm, and the FWHM is 0.546.

Mix 61 wt% of zirconia synthesized above, 5 wt% of phosphoric acid dispersant, and 34 wt% of acrylate monomer to obtain zirconia monomer dispersion.

[Comparative example 2]

Use the hydrothermal synthesis method to synthesize zirconia nanoparticles with a mixed structure of tetragonal and monoclinic systems. At this time, in the crystal phase of zirconia particles, the volume fraction of the tetragonal structure is 53.1%, and the crystal size is 11.7nm. , FWHM is 0.710. The volume fraction of the monoclinic structure is 46.9%, the crystal size is 15.4nm, and the FWHM is 0.541.

A monomer dispersion was prepared in the same manner as in Comparative Example 1.

[Comparative example 3]

Zirconia nanoparticles with a mixed structure of tetragonal and monoclinic crystals were synthesized by hydrothermal synthesis. At this time, in the crystal phase of the zirconia particles, the volume fraction of the tetragonal structure was 55.7%, the crystal size was 10.8 nm, and the FWHM was 0.766. The volume fraction of the monoclinic structure is 44.3%, the crystal size is 12.5nm, and the FWHM is 0.663.

A monomer dispersion was prepared in the same manner as in Comparative Example 1.

[Example 1]

Zirconia nanoparticles with a mixed structure of tetragonal and monoclinic crystals were synthesized by hydrothermal synthesis. At this time, in the crystal phase of the zirconia particles, the volume fraction of the tetragonal structure was 60.2%, the crystal size was 7.8 nm, and the FWHM was 0.980. The volume fraction of the monoclinic structure is 39.8%, the crystal size is 9.9nm, and the FWHM is 0.712.

A monomer dispersion was prepared in the same manner as in Comparative Example 1.

[Example 2]

Zirconia nanoparticles with a mixed structure of tetragonal and monoclinic crystals were synthesized by hydrothermal synthesis. At this time, in the crystal phase of the zirconia particles, the volume fraction of the tetragonal structure was 60.7%, the crystal size was 7.7 nm, and the FWHM was 0.990. The volume fraction of the monoclinic structure is 39.3%, the crystal size is 7.8nm, and the FWHM is 0.978.

A monomer dispersion was prepared in the same manner as in Comparative Example 1.

[Example 3]

Zirconia nanoparticles with a mixed structure of tetragonal and monoclinic crystals were synthesized by hydrothermal synthesis. At this time, in the crystal phase of the zirconia particles, the volume fraction of the tetragonal structure was 62.5%, the crystal size was 7.3 nm, and the FWHM was 1.042. The volume fraction of the monoclinic structure is 37.5%, the crystal size is 9.9nm, and the FWHM is 0.781.

A monomer dispersion was prepared in the same manner as in Comparative Example 1.

＜Refractive index measurement method＞

Drop the sample of the coating solution prepared according to this embodiment onto the prism at room temperature (25°C), then press the start button to reach the set temperature and the measurement will start automatically, and the measurement result is the refractive index of the composition, as shown in Table 1 shown.

Measuring equipment: ATAGO / JAPAN

Model: RX-5000 Alpha

Table 1 shows the full width at half maximum (FWHM), crystal size, volume fraction, refractive index of the dispersion liquid, yellowness (Y.I) of Comparative Examples 1 to 3 and Examples 1 to 3 of the present invention according to the crystal structure of zirconia and haze.

[Table 1] Zirconia (ZrO ₂ ) XRD crystal structure Acrylates-monomer dispersion ZrO ₂ 61wt% Tetragonal system (2θ=30.119°) Monoclinic system (2θ=28.217°) Refractive index Yellowness (YI) Haze (Haze) (%) wxya Crystal size (nm) Volume fraction Vt (%) wxya Crystal size (nm) Volume fraction Vm (%) Comparative example 1 0.659 12.6 46.5 0.546 15.3 53.5 1.692 48.67 24.98 Comparative example 2 0.710 11.7 53.1 0.541 15.4 46.9 1.692 38.69 17.98 Comparative example 3 0.766 10.8 55.7 0.663 12.5 44.3 1.692 30.14 12.67 Example 1 0.980 7.8 60.2 0.712 9.9 39.8 1.692 29.45 9.60 Example 2 0.990 7.7 60.7 0.978 7.8 39.3 1.692 24.78 11.43 Example 3 1.042 7.3 62.5 0.781 9.9 37.5 1.692 28.05 17.94

Referring to Table 1, according to the acrylate-monomer dispersions prepared in Examples 1 to 3 of the present invention, the volume fraction of the tetragonal crystal system exceeds 60%, the volume fraction of the monoclinic crystal system is lower than 40%, and the crystal size is less than 10nm. Thus, the acrylate-monomer dispersions prepared in Examples 1 to 3 of the present invention have a high refractive index of 1.690-1.695, while the yellowness (YI ASTM D1925) is reduced to less than 30, and at the same time, it can be confirmed that the haze is reduced degree of effect.

To sum up, the embodiments are described through limited drawings, and those skilled in the art can make various changes and modifications based on the descriptions. Appropriate results can also be obtained if the described techniques are performed in a different order, and/or if the described constituent elements are combined or combined in a different manner, or replaced or replaced by other constituent elements or equivalents.

Therefore, other embodiments, other embodiments, claims and their equivalents should be construed as being included in the present invention.

none

Fig. 1 is a diagram illustrating the crystal structure and density of ordinary zirconia particles.

FIG. 2 is a diagram illustrating measurement of the crystal size of the crystal structure of zirconia nanoparticles according to an example of the present invention.

Domestic deposit information (please note in order of depositor, date, and number) none Overseas storage information (please note in order of storage country, institution, date, and number) none

Claims (19)

A metal oxide dispersion, characterized in that, include: Zirconia nanoparticles; monomer; and surface modifiers, The full width at half maximum of the tetragonal system of the zirconia nanoparticles is 0.9 or more, The full width at half maximum of the monoclinic crystal system is 0.7 or more. According to the metal oxide dispersion liquid of claim 1, it is characterized in that, The crystal size of the zirconia nanoparticles is less than 10 nm. According to the metal oxide dispersion liquid of claim 1, it is characterized in that the volume fraction (Vm) of the monoclinic system calculated by the following formula 1 and formula 2 is 30% to 40%, by the following formula 3 The calculated volume fraction (Vt) of the tetragonal system is 60% to 70%, [Formula 1]

; [Formula 2]

;as well as

: volume fraction of monoclinic system

:for

monoclinic intensity of the peak of the face

:for

The tetragonal intensity of the peak of the face [Equation 3]

: volume fraction of the tetragonal system. According to the metal oxide dispersion liquid of claim 1, it is characterized in that, The zirconia nanoparticles are 40% to 70% by weight in the metal oxide dispersion. According to the metal oxide dispersion liquid of claim 1, it is characterized in that, The monomers include methyl acrylate, lauryl acrylate, ethoxydiethylene glycol acrylate, methoxytriethylene glycol acrylate, phenoxyethyl acrylate, tetrahydrofurfuryl acrylate, isobornyl acrylate, 2-Hydroxyethyl Acrylate, 2-Hydroxypropyl Acrylate, 2-Hydroxy-3-Phenoxy Acrylate, Neopentyl Glycol Diacrylate, 1,6-Hexanediol Diacrylate, Trimethylolpropane Triacrylate, Pentaerythritol Triacrylate, Pentaerythritol Tetraacrylate, Dipentaerythritol Hexaacrylate, Trimethylolpropane Acrylate Benzoate, Trimethylolpropane Benzoate, Methyl Methacrylate, Methacrylic Acid 2-Ethylhexyl, octadecyl methacrylate, cyclohexyl methacrylate, tetrahydrofurfuryl methacrylate, phenoxyethyl methacrylate, methoxypolyethylene methacrylate, formazan 2-Hydroxyethyl methacrylate, 2-Hydroxybutyl methacrylate, Heptadecafluorodecyl methacrylate, Trifluoromethyl methacrylate, Trifluoroethyl acrylate, Hexafluoropropyl methacrylate, 1,6 -Hexanediol Dimethacrylate, Trimethylolpropane Trimethacrylate, Glyceryl Dimethacrylate Hexamethylene Diisocyanate, Ethylene Glycol Dimethacrylate, Urethane Acrylate, Epoxy Acrylate ester, melamine acrylate, benzyl acrylate, benzyl methacrylate, phenyl acrylate, diphenyl acrylate, biphenyl acrylate, 2-biphenyl acrylate, 2-([1,1'-biphenyl]- 2-oxy)ethyl acrylate, phenoxybenzyl acrylate, 3-phenoxybenzyl-3-(1-naphthyl)acrylate, ethyl(2E)-3-hydroxy-2-(3 -phenoxybenzyl) acrylate, phenyl methacrylate, biphenyl methacrylate, 2-nitrophenyl acrylate, 4-nitrophenyl acrylate, 2-nitrophenyl methacrylate, 4 -Nitrophenyl methacrylate, 2-nitrobenzyl methacrylate, 4-nitrobenzyl methacrylate, 2-chlorophenyl acrylate, 4-chlorophenyl acrylate, 2-chloro Phenyl methacrylate, 4-chlorophenyl methacrylate, o-phenylphenol ethyl acrylate, phenol, biphenyl methacrylate, o-phenylphenol ethoxyacrylate, 1-(biphenyl- 2-ylmethyl)-4-phenylpiperazine, 1-(biphenyl-2-ylmethyl)-4-(2-methoxyphenyl)piperazine, 1-(biphenyl-2-yl Methyl)-4-(2-ethoxyphenyl)piperazine, 1-(biphenyl-2-ylmethyl)-4-(2-isopropoxyphenyl)piperazine, 1-(biphenyl Benzene-2-ylmethyl)-4-(3-methoxyphenyl)piperazine, 1-(biphenyl-2-ylmethyl)-4-(4-methoxyphenyl)piperazine and At least one selected from the group consisting of bisphenol diacrylate. According to the metal oxide dispersion liquid of claim 1, it is characterized in that, The monomer is 1% to 50% by weight in the metal oxide dispersion. According to the metal oxide dispersion liquid of claim 1, it is characterized in that, The surface modifier includes a silane coupling agent, The silane coupling agent is composed of acrylate, (meth)acrylic, epoxy, alkoxy, vinyl, phenyl, methacryloxy, amino, chlorosilyl, chloropropyl At least one silane selected from the group consisting of thiol and mercapto. According to the metal oxide dispersion liquid of claim 1, it is characterized in that, The surface modifier includes γ-methacryloxypropyltrimethoxysilane, 4-aminobutylmethyldiethoxysilane, 3-aminopropyltrimethoxysilane, N-2-amino Ethyl-3-aminopropyldiethylisopropoxysilane, (mercaptomethyl)dimethylethoxysilane, di-4-mercaptobutyldimethoxysilane, 3-mercaptopropyltriisopropoxysilane Propoxysilane, 3-methacryloxypropyldimethylethoxysilane, 3-acryloxypropyltrimethoxysilane, (3-glycidyloxypropyl)methyldimethylsilane Oxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-chloropropyltrimethoxysilane, 4-bromobutylmethyldibutoxysilane, 5-iodohexyldiethyl methoxysilane, 3-isocyanatepropyltrimethoxysilane, 3-isothiocyanatepropylmethyldimethoxysilane, 3-hydroxybutylisopropyldimethoxysilane, bis(2 -Hydroxyethyl)-3-aminopropyltriethoxysilane, bromophenyltrimethoxysilane, (2-(iodophenyl)ethyl)ethyldimethoxysilane, bis(chloromethylbenzene base) dimethoxysilane, bromomethylphenyldimethylisopropoxysilane, bis(propyltrimethoxysilane)carbodiimide, N-ethyl-N-(propylethoxydi methoxysilane)-carbodiimide, 3-(trimethoxysilyl)propanol, (3,5-hexanedione)triethoxysilane, 3-(trimethoxysilyl)propanol Acetyl acetate, 3-(trimethoxysilyl)propylmethacrylate silane, 3-aminopropyltrimethoxysilane, 2-aminopropyltrimethoxysilane, N-(2- Aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-ureapropyltrimethoxysilane, N- Ethoxycarbonyl-3-aminopropyltrimethoxysilane, N-triethoxysilylpropyltriethylenetriamine, N-trimethoxysilylpropyltriethylenetriamine, 10- Trimethoxysilyl-1,4,7-triazoldecane, 10-triethoxysilyl-1,4,7-triazoldecane, 9-trimethoxysilyl-3, Nonyl 6-azoacetate, 3-(triethoxysilyl)propylsuccinic anhydride, N-benzyl-3-aminopropyltrimethoxysilane, N-phenyl-3-aminopropyltrimethyl At least any one selected from the group consisting of oxysilane, N-dioxyethylene-3-aminopropyltrimethoxysilane and (methacryloxy)propyltrimethoxysilane. According to the metal oxide dispersion liquid of claim 1, it is characterized in that, The surface modifier is 1% to 50% by weight in the metal oxide dispersion. According to the metal oxide dispersion liquid of claim 1, it is characterized in that, The metal oxide dispersion also includes a dispersant, The dispersant includes polyether acid compounds, polyether amine compounds, polyether acid/amine mixtures, ester compounds containing phosphoric acid groups, and polyether compounds containing phosphoric acid groups. at least one. According to the metal oxide dispersion liquid of claim 1, it is characterized in that, The metal oxide dispersion is a solvent-free type. According to the metal oxide dispersion liquid of claim 1, it is characterized in that, The viscosity of the metal oxide dispersion is 200 cP to 50,000 cP. According to the metal oxide dispersion liquid of claim 1, it is characterized in that, The refractive index of the metal oxide dispersion liquid is 1.60 or more. According to the metal oxide dispersion liquid of claim 1, it is characterized in that, The yellowness of the metal oxide dispersion is 30 or less, Haze is 20% or less. A thin film composition for display, characterized in that, include: The metal oxide dispersion of claim 1; UV photoinitiators; and UV curable monomer. According to the thin film composition for display according to claim 15, it is characterized in that, The UV photoinitiator includes at least any one selected from the group consisting of cationic photoinitiators and free radical photoinitiators, Wherein, the cationic photoinitiator is selected from onium salts, diazonium salts, columium salt compounds and imidazoles; the free radical photoinitiator is selected from thioxanthones, phosphorus, triazines, bis Choose from benzophenones, benzoin, oximes, acetones, aminoketones, ketones, benzoin ether acetophenones, anthraquinones and aromatic phosphine oxides. According to the thin film composition for display according to claim 15, it is characterized in that, The UV curing monomer comprises glycidyl acrylate, glycidyl methacrylate, glycidyl methacrylate, glycidyl-α-ethyl acrylate, glycidyl-α-n-propyl acrylate, glycidyl -α-butyl acrylate, 3,4-epoxybutyl methacrylate, 3,4-epoxybutyl acrylate, 6,7-epoxyheptyl methyl methacrylate, 6,7-epoxyheptyl Acrylate, 6,7-epoxyheptyl-α-ethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl acrylate, tetrahydrofurfuryl acrylate, isobornyl acrylate, 2-methacrylate At least any one selected from the group consisting of hydroxyethyl ester, tripropylene glycol diacrylate, dipropylene glycol diacrylate, 1,6-hexanediol diacrylate and trimethylolpropane triacrylate. An optical film comprising a cured product of the dispersion composition for a display according to claim 15. An optical element for a display comprising the diffusion film of claim 18.

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