TW201607609A - Metal oxide particle dispersion, composition containing metal oxide particles, coating film, and display device - Google Patents

Abstract

Provided are a metal oxide particle dispersion having high transparency and excellent stability over time, a composition containing metal oxide particles, a coating film, and a display device. Provided is a metal oxide particle dispersion in which metal oxide particles surface-treated with a silicon compound represented by general formula (1) are dispersed in a solvent, the metal oxide particle dispersion characterized in that the metal oxide particle dispersion further includes an amine having a carbon number of 2 or greater, the average primary particle diameter of the metal oxide particles is 3 nm to 20 nm, the refractive index is 1.9 or higher, the solvent contains 70% by mass or more of an organic solvent, the solubility parameter of the organic solvent is 8.0 to 12 and the solubility thereof in water is 1.5 g/100 mL or greater, and the water content is 3% by mass or less of the content of the metal oxide particles. (1): R'nSi(OR)m.

Description

Metal oxide particle dispersion, composition containing metal oxide particles, coating film, and display device

The present invention relates to a metal oxide particle dispersion, a composition containing metal oxide particles, a coating film, and a display device.

The metal oxide particles are dispersed in a coating material, a film, or a substrate for the purpose of adjusting the refractive index, imparting conductivity, antistatic property, ultraviolet shielding property, heat ray shielding property, electromagnetic wave shielding property, and the like, and improving mechanical strength. Use it. For example, a functional film of a plastic substrate used in a display device such as a liquid crystal display (LCD), a plasma display (PDP), or an electroluminescence display (EL) requires transparency, refractive index, mechanical properties, and the like. Therefore, a functional film is formed by applying a composition obtained by mixing inorganic oxide particles such as zirconia having a high refractive index and a resin onto a plastic substrate (for example, see Patent Document 1).

Further, it is conventionally known that zirconia having a high refractive index is added to a sealing resin covering a light-emitting diode (LED) to control the refractive index of the sealing resin, whereby light emitted by the light can be taken out more efficiently, and the brightness of the LED is improved. Further, among the metal oxide particles, particles of antimony doped tin oxide (ATO) or tin doped indium oxide (ITO) are used to obtain a heat ray shielding coating liquid and a heat ray shielding film which are excellent in visible light transmittance or heat ray shielding property ( For example, refer to Patent Document 2). Further, among the metal oxide particles, the zinc oxide particles are used to obtain a gas barrier laminate having high transparency (for example, see Patent Document 3).

In the above application, when the metal oxide particles are aggregated in the matrix, functions such as transparency and smoothness are lowered in the functional film. Therefore, the metal oxide particles are used by being mixed with a coating material or a resin monomer in a state in which the metal oxide particle dispersion liquid is dispersed in a solvent in advance. Further, in the step of mixing the metal oxide particle dispersion and the resin, the drying step of the coating film, the step of removing the solvent, and the like, in order to prevent aggregation of the metal oxide particles, the metal oxide particles are required to be used for the solvent, the target coating, and the coating film. The substrate and the like also exhibit excellent dispersibility. In particular, when the refractive index of the metal oxide particles is 1.9 or more, the optical properties (transparency, etc.) of the coating material, the coating film, the substrate, and the like after the preparation are likely to change due to scattering of visible light, and thus the metal oxide particles are dispersed. The liquid requires high dispersibility and stability. As a method of dispersing metal oxide particles in a solvent, a method of surface-treating a surface of a metal oxide particle by an organic ruthenium compound having a group having a decyl alcohol group by hydrolysis of a decane coupling agent or the like is conventionally known. (For example, refer to Patent Documents 4 to 6).

In order to disperse metal oxide particles in epoxy resin (10.9), acrylic resin (9.5), polystyrene (8.5 to 10.3), urethane resin (10 to 11), phenol resin (11.5), cellulose resin (10 to 12), polyester resin (10 to 11), epoxy resin (10 to 11) and other resins having a medium polarity (solubility parameter (SP value): 8.5 to 12), in the dispersion The SP value of the dispersant is synthesized to the same extent as the SP value of the above resin, and the metal oxide particles after the surface treatment are designed to have a good affinity with both the dispersant and the resin. (Prior Art Literature) (Patent Literature)

Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. International Publication No. 2008/035669 Patent Document 6: Japanese Patent No. 4609068

(Problems to be solved by the present invention)

However, in the surface treatment with an organic cerium compound, water is indispensable in order to generate a hydrolysis/polycondensation reaction. Since the SP value of water is as high as 23.4, the dispersibility of the metal oxide particles after the surface treatment cannot be improved by the water content of the organic solvent, and the transparency of the metal oxide particle dispersion is lowered or it is easy to pass over time. And the subject of agglutination. In particular, metal oxide particles having a refractive index of 1.9 or more have large scattering of light, and it is difficult to obtain a metal oxide particle dispersion having high transparency.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a metal oxide particle dispersion liquid having high transparency and excellent stability over time, a composition containing metal oxide particles, a coating film, and a display device. (means to solve the problem)

The present inventors have intensively studied in order to solve the above problems, and as a result, it has been found that when an amine having 2 or more carbon atoms is used as a reaction catalyst in an organic solvent having a moderate polarity, it is based on having a stanol group, or The surface treatment reaction of the metal oxide particles of the organic ruthenium compound having a group in which a stanol group is formed by hydrolysis is carried out with a small amount of water (content of water), so that transparency is high and stability with time is excellent. The metal oxide particle dispersion is such that the present invention has been completed.

In order to solve the above problems, the present invention provides a metal oxide particle dispersion liquid obtained by dispersing a metal oxide particle surface-treated with a ruthenium compound represented by the following formula (1) in a solvent, wherein The metal oxide particle dispersion further contains an amine having 2 or more carbon atoms, and the metal oxide particles have an average primary particle diameter of 3 nm or more and 20 nm or less, a refractive index of 1.9 or more, and the solvent contains 70% by mass or more of the organic solvent. Solvent: The solubility parameter of the organic solvent is 8.0 or more and 12 or less, the solubility in water is 1.5 g/100 ml or more, and the content of water is 3% by mass or less of the content of the metal oxide particles. R' _n Si(OR) _m (1) (wherein R is a hydrogen atom or an alkyl group, R' is an organic group, n and m are integers, n+m=4, 0<n<4)

The present invention provides a composition containing metal oxide particles, which comprises the metal oxide particle dispersion of the present invention and a binder component.

The present invention provides a coating film which is formed using the composition containing metal oxide particles of the present invention.

The present invention provides a display device comprising the coating film of the present invention. (Effect of the invention)

The metal oxide particle dispersion of the present invention has high transparency, excellent dispersion stability of metal oxide particles, and excellent long-term storage stability of the dispersion.

The metal oxide particle-containing composition of the present invention contains the metal oxide particle dispersion of the present invention which has high transparency and excellent dispersion stability of metal oxide particles. Therefore, the metal oxide particles are excellent in dispersion stability, and the composition has excellent long-term storage stability.

The coating film of the present invention is formed using the composition containing metal oxide particles of the present invention. Therefore, a coating film excellent in transparency can be obtained.

The display device of the present invention includes the coating film of the present invention which is excellent in transparency. Therefore, the visibility is excellent.

Embodiments of the metal oxide particle dispersion liquid, the composition containing the metal oxide particles, the coating film, and the display device of the present invention will be described. The present embodiment is specifically described in order to better understand the gist of the invention, and the present invention is not limited unless otherwise specified.

[Metal oxide particle dispersion liquid] The metal oxide particle dispersion liquid metal oxide particles of the present embodiment are dispersed in a solvent containing 70% by mass or more of an organic solvent, and the metal oxide particles are used in the following formula. (1) The metal oxide particles after surface treatment of the ruthenium compound have an average primary particle diameter of 3 nm or more and 20 nm or less, and a refractive index of 1.9 or more, and the solubility parameter of the organic solvent is 8.0 or more and 12 or less. The solubility in water is 1.5 g/100 ml or more. The metal oxide particle dispersion contains an amine having 2 or more carbon atoms, and the water content is 3% by mass or less of the content of the metal oxide particles. R' _n Si(OR) _m (1) (wherein R is a hydrogen atom or an alkyl group, R' is an organic group, n and m are integers, n+m=4, 0<n<4)

"Metal oxide particles" The metal oxide particles in the present embodiment are not particularly limited as long as they have a refractive index of 1.9 or more. For example, it is preferably selected from the group consisting of zirconium, zinc, iron, and copper. A metal oxide particle of one or more metal elements of the group of titanium, tin, antimony, bismuth, antimony, tungsten, antimony and bismuth.

As the metal oxide particles composed of one metal element, for example, zirconium oxide (IV) (ZrO ₂ : refractive index 2.05 to 2.4), zinc oxide (II) (ZnO: refractive index 2.01 to 2.1), and oxidation are preferably used. Iron (III) (Fe ₂ O ₃ : refractive index 3.01), copper oxide (I) (Cu ₂ O: refractive index 2.71), titanium oxide (IV) (TiO ₂ : refractive index 2.3 to 2.7), tin oxide (IV) (SnO ₂ : refractive index 2.00), cerium oxide (IV) (CeO ₂ : refractive index 2.1), cerium oxide (V) (Ta ₂ O ₅ : refractive index 2.2), cerium oxide (V) (Nb ₂ O ₅ : refractive index 2.4), tungsten oxide (VI) (WO ₃ : refractive index 2.2), cerium (III) oxide (Eu ₂ O ₃ : refractive index 1.98), cerium oxide (IV) (HfO ₂ : refractive index 2.0), etc. .

As the metal oxide particles composed of two kinds of metal elements, for example, potassium titanate (K ₂ Ti ₆ O ₁₃ : refractive index 2.68), barium titanate (BaTiO ₃ : refractive index 2.3 to 2.5), and titanic acid are preferably used.锶 (SrTiO ₃ : refractive index 2.37), potassium citrate (KNbO ₃ : refractive index 2.17), lithium niobate (LiNbO ₃ : refractive index 2.35), calcium tungstate (CaWO ₄ : refractive index 1.91), bismuth added tin oxide (ATO; Sb solid solution SnO ₂ : refractive index 1.95 to 2.05), indium added tin oxide (ITO; In solid solution SnO ₂ : refractive index 1.95 to 2.05), and the like.

Among the metal oxide particles, zirconia (IV), zinc (II) oxide, titanium oxide (IV), lanthanum-doped tin oxide, and indium addition oxidation are more preferably used from the viewpoint of raw material cost or production cost. Tin is more preferably used because it has less concern for coloring due to absorption/scattering in the vicinity of 400 nm.

The average primary particle diameter of the metal oxide particles is 3 nm or more and 20 nm or less, preferably 8 nm or more and 20 nm or less, more preferably 10 nm or more and 15 nm or less. When the average primary particle diameter of the metal oxide particles is less than 3 nm, the crystallinity of the metal oxide particles is low, and the target refractive index may not be obtained. Further, when the metal oxide particles are dispersed in a solvent, the metal oxide particles are likely to aggregate, and thus a dispersion having high transparency may not be obtained. Further, since the metal oxide particles have a large specific surface area, the amount of the ruthenium compound required for obtaining the dispersion is large, and as the metal oxide particles subjected to the surface treatment, a sufficient refractive index may not be obtained. On the other hand, when the average primary particle diameter exceeds 20 nm, the dispersed particle diameter when the metal oxide particles are dispersed in a solvent is large, and a dispersion having high transparency may not be obtained.

In the present embodiment, the "average primary particle diameter" means the particle diameter of each particle itself. The measurement method of the average primary particle diameter is a measurement of the long diameter of each of the metal oxide particles using a scanning electron microscope (SEM) or a transmission electron microscope (TEM), and for example, 100 or more metal oxides are measured. The long diameter of each of the particles is determined by measuring the long diameter of each of the 500 metal oxide particles and calculating the arithmetic mean value thereof.

The specific surface area of the metal oxide particles is preferably 70 m ² /g or more and 95 m ² /g or less. The larger the specific surface area of the metal oxide particles, the more the amount of the cerium compound and the amount of water required for the surface treatment. In addition, the smaller the specific surface area of the metal oxide particles, the larger the particle diameter of the metal oxide particles or the strong agglomeration of the metal oxide particles, and thus it is difficult to obtain a dispersion having high transparency. Therefore, the above range is preferred.

"Antimony compound" The anthracene compound in the present embodiment is represented by the above formula (1). That is, the oxime compound in the present embodiment has an oxime group or an organic ruthenium compound having a group which forms a stanol group by hydrolysis. The R-based hydrogen atom or the alkyl group having 1 to 22 carbon atoms in the above formula (1) is preferred. The alkyl group may be any of a linear chain, a branched chain, and a cyclic chain. When the alkyl group is cyclic, it may be either a monocyclic or a polycyclic one. In addition, it is preferable that the alkyl group has 1 to 22 carbon atoms, and the compound having a higher affinity with a solvent to be described later has a carbon number of 1 or more and 6 or less.

The linear or branched alkyl group preferably has 1 to 22 carbon atoms, and examples of the alkyl group include a methyl group, an ethyl group, a n-propyl group, an isopropyl group, and an n-butyl group. Isobutyl, sec-butyl, tert-butyl, n-pentyl, isopentyl, neopentyl, tert-amyl, 1-methylbutyl, n-hexyl, 2-methylpentyl, 3-methylpentyl Base, 2,2-dimethylbutyl, 2,3-dimethylbutyl, n-heptyl, 2-methylhexyl, 3-methylhexyl, 2,2-dimethylpentyl, 2, 3-dimethylpentyl, 2,4-dimethylpentyl, 3,3-dimethylpentyl, 3-ethylpentyl, 2,2,3-trimethylbutyl, n-octyl , isooctyl, decyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl , nonadecyl, eicosyl, icosyl, behenyl and the like. The linear or branched alkyl group has preferably 1 or more and 6 or less carbon atoms from the viewpoint of affinity with a solvent to be described later.

The cyclic alkyl group preferably has 1 to 22 carbon atoms, and preferably has 3 to 10 carbon atoms. Examples of the cyclic alkyl group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, a cyclodecyl group, a cyclodecyl group, a norbornyl group, and an isobornyl group. Base, 1-adamantyl, 2-adamantyl and the like. In addition, examples of the alkyl group include those in which one or more hydrogen atoms of the cyclic alkyl group are substituted by a linear chain, a branched chain or a cyclic alkyl group. From the viewpoint of affinity with a solvent to be described later, the number of carbon atoms of the cyclic alkyl group is preferably 3 or more and 6 or less.

Further, one or two or more hydrogen atoms in the alkyl group may be optionally substituted with a halogen atom. Examples of the halogen atom substituted with a hydrogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.

The R'-based organic group in the above formula (1). The selection may be appropriately carried out in consideration of the affinity with a solvent to be described later. For example, an acryloyl group, a methacryloyl group, a vinyl group, a propenyl group, a butadienyl group, a styryl group, an ethynyl group, a cinnamyl group, a maleate group, an acrylamide group, and an amino group are mentioned. , allyl, epoxy, glycidyloxy, and the like. The organic group is preferably a functional group having a polymerizable unsaturated group. The polymerizable unsaturated group is not particularly limited, and examples thereof include an acrylonitrile group, a methacryloyl group, a vinyl group, a propylene group, a butadienyl group, a styryl group, an ethynyl group, a cinnamyl group, and a Malay. An acid ester group, an acrylamide group, or the like. These polymerizable unsaturated groups are constituent units of addition polymerization by living radical species.

n and m in the above formula (1) are integers and satisfy n + m = 4 and 0 < n < 4. It is preferred that n is 2 or 3.

Examples of the ruthenium compound represented by the above formula (1) include an alkoxy group such as a methoxy group, an ethoxy group or an isopropoxy group bonded to a ruthenium atom, an aryloxy group or an ethoxy group. A compound such as an amino group or a halogen atom. Among these, a compound in which an alkoxy group is bonded to a halogen atom, that is, an organoalkoxydecane is particularly preferable. Specific examples of the ruthenium compound represented by the above formula (1) include vinyltrimethoxydecane, vinyltriethoxydecane, and 2-(3,4-epoxycyclohexyl)ethyltrimethoxydecane. , 3-glycidoxypropyltrimethoxydecane, 3-glycidoxypropyltriethoxydecane, p-styryltrimethoxydecane, p-styryltriethoxydecane, 3 - methacryloxypropylmethyldimethoxydecane, 3-methylpropenyloxypropyltrimethoxydecane, 3-methylpropenyloxypropylmethyldiethoxydecane, 3-methylpropenyloxypropyltriethoxydecane, 3-propenyloxypropyltrimethoxydecane, 3-propenyloxypropyltriethoxydecane, allyltrimethoxydecane , allyl triethoxy decane, vinyl ethyl dimethoxy decane, vinyl ethyl diethoxy decane, N-2-(aminoethyl)-3-aminopropyl methyl dimethoxy Baseline, N-2-(aminoethyl)-3-aminopropyltrimethoxydecane, 3-aminopropyltrimethoxydecane, 3-aminopropyltriethoxydecane, tris-(trimethoxy)矽alkylpropyl)isocyanurate, 3-ureidopropyltrialkoxydecane, 3-mercaptopropylmethyldimethoxydecane, 3-mercaptopropyltrimethoxydecane, bis(tri-B Oxymethylene alkyl propyl) tetrasulfide, 3-isocyanate propyl triethoxy decane, and the like.

The hydrazine compound represented by the above formula (1) contains an acrylonitrile group, a methacryl fluorenyl group, a vinyl group, a propylene group, a butadienyl group, a styryl group, an ethynyl group, a cinnamyl group, and a maleate. A functional group of a polymerizable unsaturated group such as a acrylamide group or the like is preferred. In this case, when the metal oxide particle dispersion liquid of the present embodiment is blended in a paint or the like to prepare a coating film or the like, the metal oxide particles are less likely to aggregate.

The surface treatment of the metal oxide particles by the ruthenium compound means that the ruthenium compound and the metal oxide particles are bonded to each other by some interaction. It may be bonded by a covalent bond or may be bonded by a non-covalent bond such as physical adsorption. Further, the metal oxide particles may be subjected to pre-hydrolysis, and after some or all of the hydrolysis is carried out, the metal oxide particles are surface-treated by the cerium compound.

"Organic solvent" The solvent in the present embodiment contains 70% by mass or more of an organic solvent having a solubility parameter (SP value) of 8.0 or more and 12 or less and a solubility in water of 1.5 g/100 ml or more, and preferably 80% by mass or more. More preferably, it is 90% by mass or more. When the content of the organic solvent is less than 70% by mass, the metal oxide particles are formed when the coating film is formed using the metal oxide particle dispersion of the present embodiment or when the solvent is removed from the metal oxide particle dispersion of the present embodiment. It is possible to agglutinate or gel. Further, there is a possibility that the water required for the hydrolysis of the hydrazine compound cannot be dissolved. In addition, when the coating material for the metal oxide particles of the present embodiment is prepared by using the coating material to form a coating film or when the solvent is removed from the coating material, the volatilization rate is high, and thus the metal oxide particles may segregate.

When the solubility parameter of the organic solvent is limited to the above range, the metal oxide particle dispersion of the present embodiment can be preferably blended with an epoxy resin (SP value: 10.9), an acrylic resin (SP value: 9.5), Polystyrene (SP value: 8.5 to 10.3), urethane resin (SP value: 10 to 11), phenol resin (SP value: 11.5), cellulose resin (SP value: 10 to 12), polyester resin (SP value: 10 to 11), epoxy resin (SP value: 10 to 11) and other resins having a moderate polarity (SP value: 8.5 to 12). In addition, when the solubility parameter of the organic solvent is out of the above range, the difference in polarity between the metal oxide particle dispersion of the present embodiment and the above resin is large, and it may be difficult to obtain a transparent coating material. Further, when a coating film is formed using the coating material containing the metal oxide particle dispersion of the present embodiment or when the solvent is removed from the coating material, the metal oxide particles may aggregate or gel.

Examples of the organic solvent in the present embodiment include methyl isobutyl ketone (SP value: 8.4), butyl acetate (SP value: 8.5), ethyl acrylate (SP value: 8.6), and diacetone alcohol ( SP value: 9.2), methyl ethyl ketone (SP value: 9.3), cyclohexanone (SP value: 9.9), 1-methoxy-2-propanol (SP value: 9.5), dodecanol (SP value: 9.8) -10.3), cyclopentanone (SP value: 10.4), 2,3-butanediol (SP value: 11.1), 1-propanol (SP value: 11.9), and the like.

In the present embodiment, the solubility parameter ((cal/cm) ^1/2 ) can be, for example, "Polymer Handbook fourth edition" written by J. Brandrup et al. The methods described in VII 675 to 713 (especially the B3 type and the B8 type) are calculated. Further, the values of Table 1 (VII 711), Table 7 (VII 688-694), and Table 8 (VII 694-697) of the aforementioned documents can be used.

The boiling point of the organic solvent is preferably 80 ° C or higher. When the boiling point of the organic solvent is 80° C. or higher, the metal oxide particle dispersion of the present embodiment can be used in a coating film to form a coating film, or when a solvent is removed from the coating material, an appropriate degree can be obtained. The volatilization rate can suppress segregation of metal oxide particles.

Further, when the solubility of water in the organic solvent is out of the above range, the amount of water required for the hydrolysis of the hydrazine compound may not be dissolved in the organic solvent.

Examples of the organic solvent having a solubility parameter of 8.0 or more and 12 or less and a solubility in water of 1.5 g/100 ml or more include methyl isobutyl ketone (MIBK), cyclohexanone, diacetone alcohol, and 1-methoxy- 2-propanol (PGM), isopropanol, methyl ethyl ketone (MEK), ethyl acetate, and the like. As the organic solvent, a solvent having a solubility parameter of 8.0 or more and 12 or less and a solubility in water of 1.5 g/100 ml or more may be used alone, or a mixed solvent of two or more kinds may be used.

In the solvent of the present embodiment, in addition to the above organic solvent, in order to adjust the drying rate when the coating film is prepared using the coating material of the metal oxide particle dispersion of the present embodiment, or when the solvent is removed from the coating film, The speed and the like may also contain a high boiling point solvent or a dispersant. Further, the high boiling point solvent is preferably a solvent having a solubility parameter of 8.0 or more and 12 or less and a solubility in water of 1.5 g/100 ml or more. In other words, the organic solvent contained in the metal oxide particle dispersion is preferably a solvent having a solubility parameter of 8.0 or more and 12 or less and a solubility in water of 1.5 g/100 ml or more. However, an organic solvent other than the organic solvent having a solubility parameter of 8.0 or more and 12 or less and a solubility in water of 1.5 g/100 ml or more may be contained in a range that does not impair the characteristics of the metal oxide particle dispersion of the present embodiment.

"Amine" The amine having 2 or more carbon atoms in the present embodiment functions as a catalyst in the surface treatment of the metal oxide particles by the above ruthenium compound. In addition, the amine having 2 or more carbon atoms in the present embodiment functions as a dispersing agent for the metal oxide particles, and suppresses the surface treatment reaction in a state in which the metal oxide particles are aggregated. In addition, since the substituent of the amine having two or more carbon atoms interacts with the metal oxide particles, the hydrolysis reaction is carried out on the surface of the metal oxide particles to suppress the condensation of the ruthenium compounds, and the ruthenium compound can be easily carried out. The effect of the surface treatment reaction of the metal oxide particles. Therefore, in the present embodiment, the amine-based carbon number is preferably 6 or more, and more preferably 10 or more carbon atoms.

Examples of the amine having 2 or more carbon atoms in the embodiment include alkanolamines such as monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, and triisopropanolamine. Aliphatic polyamines such as monoethylamine, diethylamine, triethylamine, ethylenediamine, isopropylamine, diethylenetriamine, 2-ethylhexylamine, tri-ethyltetramine and tetraethylenepentamine; aniline , o-toluidine, methylene ortho chloramine, 4,4'-diphenylmethanediamine, 2,4'-toluenediamine, 2,6'-toluenediamine, and 4-amino An aromatic polyamine such as benzoic acid; a polymer having an amino group such as polyaminoguanamine, polyalkanolamine, polyoxyethylene alkylamine, polyester polyamine, and amino-modified anthrone. Among these, the metal oxide particle dispersion liquid of the present embodiment further has an amino group such as polyaminoguanamine or polyalkanol aminoguanamine which functions as a dispersibility/dispersion aid of the metal oxide particles. The polymer is preferred.

The product of the amine value of the amine having 2 or more carbon atoms and the content of the amine having 2 or more carbon atoms, that is, the amine value of the amine having 2 or more carbon atoms × (the amine having 2 or more carbon atoms) The content (% by mass) of the entire metal oxide particle dispersion of the present embodiment is preferably 10 or more and 45 or less, more preferably 25 or more and 42 or less. When the product of the amine value of the amine having 2 or more carbon atoms and the content of the amine having 2 or more carbon atoms is less than 10, the amount of the amine as the reaction catalyst is small, and thus the hydrolysis reaction of the ruthenium compound may not be sufficiently performed. On the other hand, when the product exceeds 45, when the metal oxide particle dispersion of the present embodiment is blended in a paint and the paint is used to form a coat film, the amount of the amine is too large and may be contained in the paint. The physical properties of the resin are deteriorated.

The content of water in the metal oxide particle dispersion of the present embodiment is 3% by mass or less of the content of the metal oxide particles. In other words, when the content of the metal oxide particles in the metal oxide particle dispersion is 100% by mass, the content of water in the metal oxide particle dispersion is 3% by mass or less of the content of the metal oxide particles. When the content of water exceeds 3% by mass of the content of the metal oxide particles, the stability with time in the metal oxide particle dispersion may be impaired. Further, when the metal oxide particle dispersion of the present embodiment is blended in a coating material containing a medium-polar resin (SP value: 8.5 to 12), and a coating film is formed using the coating material, the solubility parameter of water is as high as possible. 23.4, therefore, as the solvent evaporates from the coating film, the polarity in the coating becomes high. Thereby, metal oxide particles may be aggregated or segregated. In addition, the temporal stability of the metal oxide particle dispersion of the present embodiment means that the metal oxide particles are less likely to aggregate even after the passage of time, and the metal oxide particles are stably dispersed in the solvent for a long period of time.

When the metal oxide particle dispersion of the present embodiment contains water in an amount required for hydrolysis of the ruthenium compound, the water content is preferably as small as possible. Specifically, the content of water in the metal oxide particle dispersion liquid is preferably 1.2% by mass or less based on the total amount of the metal oxide particle dispersion liquid. When the content of water in the metal oxide particle dispersion is 1.2% by mass or less, the temporal stability of the metal oxide particle dispersion can be further improved. Here, the content of water required for the hydrolysis of the ruthenium compound means the amount of hydrolysis required to carry out the surface treatment of the metal oxide particles with the ruthenium compound, and may be less than that required for the entire hydrolysis (hydrolysis rate of 100%). The content of water. Further, in the surface treatment reaction, water adhering to the metal oxide particles or bound water can also be used.

The content of the metal oxide particles in the metal oxide particle dispersion of the present embodiment is preferably 10% by mass or more and 60% by mass or less based on the entire metal oxide particle dispersion liquid of the present embodiment, and is preferably 20% by mass or more. Further, it is more preferably 50% by mass or less, and further preferably 30% by mass or more and 50% by mass or less. When the content of the metal oxide particles in the metal oxide particle dispersion is 10% by mass or more, when the metal oxide particle dispersion is used in a coating material or the like, the amount of the solvent in the coating material is an appropriate amount, so that it can be suppressed. The cost of the solvent. Further, it is also possible to suppress the cost when the solvent is removed from the coating film formed using the coating material. On the other hand, when the content of the metal oxide particles is 60% by mass or less, an appropriate interaction between the metal oxide particles can be obtained. As a result, it is difficult to cause an increase in the viscosity of the metal oxide particle dispersion or gelation of the metal oxide particle dispersion, and it is possible to maintain excellent stability over time of the metal oxide particle dispersion.

When the dispersed particle diameter of the metal oxide particles in the metal oxide particle dispersion is sufficiently smaller than the wavelength of light, that is, in the following formula (2), when α<<1 (generally α<0.4), the metal is used. The scattering of light generated by the oxide particles becomes Rayleigh scattering. On the other hand, when the dispersed particle diameter of the metal oxide particles in the metal oxide particle dispersion is larger than the wavelength of light, the scattering of light generated by the metal oxide particles becomes Mie scattering. α=π·D/λ (2) In the above formula (2), α is a particle diameter parameter, D is a dispersed particle diameter of the metal oxide particles, and λ is a wavelength of light. Therefore, in the visible light region (wavelength: 400 nm to 800 nm), if the dispersed particle diameter of the metal oxide particles exceeds about 50 nm, Mie scattering having a higher scattering intensity does not become Rayleigh scattering. The scattering intensity depends not only on the dispersed particle diameter of the metal oxide particles but also on the refractive index of the metal oxide particles, and therefore, in particular, in order to improve the transparency of the metal oxide particle dispersion containing metal oxide particles having a refractive index of 1.9 or more. It is important to maintain the dispersed particle diameter of the metal oxide particles to be substantially 50 nm or less.

Therefore, when the cumulative volume fraction of the particle size distribution of the metal oxide particle dispersion of the present embodiment having a high transparency is 90%, the particle diameter (D90) is preferably 60 nm or less, more preferably 50 nm or less. When the particle diameter (D90) when the cumulative volume fraction of the particle size distribution of the metal oxide particle dispersion is 90% is 60 nm or less, the transparency of the metal oxide particle dispersion can be further improved.

Further, when the particle size distribution of the metal oxide particle dispersion liquid is wide, coarse particles are also increased, and thus the transparency of the metal oxide particle dispersion liquid is likely to be lowered. Further, as the coarser particles are larger, the sedimentation is more likely to occur. Therefore, in order to improve the temporal stability of the metal oxide particle dispersion, it is necessary to obtain a dispersion having a sharp particle size distribution. Therefore, the particle diameter (D90) when the cumulative volume fraction of the particle size distribution is 90% in the metal oxide particle dispersion of the present embodiment is considered from the viewpoints of the higher transparency and the more excellent stability over time. The value of the particle diameter (D50) when the cumulative volume fraction of the particle size distribution is 50% is preferably 3 or less, more preferably 2 or less. In particular, metal oxides containing metal oxide particles having an average primary particle diameter of 10 nm or more and 20 nm or more are produced from the viewpoint of the content of the ruthenium compound required for the production of the metal oxide particle dispersion liquid and the crystallinity of the metal oxide particles. In the case of a particle dispersion, it is important that D90/D50 is 3 or less. Further, the lower limit of D90/D50 is 1 or more.

When the measurement is performed on the basis of air, the liquid haze value of the metal oxide particle dispersion of the present embodiment is preferably 35% or less, more preferably 27% or less, and still more preferably 22% or less. When the liquid haze value of the metal oxide particle dispersion liquid is 35% or less, the metal oxide particle dispersion liquid is blended in the coating material, and the light of the coating film formed using the coating material is moderately scattered, and the coating film is suitable for the coating film. Specifications in optical applications. Further, when used as a protective layer or the like, there is no need to worry about impairing the design of the underlayer.

In the metal oxide particle dispersion of the present embodiment, the content of the metal oxide particles is 30% by mass, and the liquid haze value when the optical path length is 2 mm is preferably 35% or less. % or less is more preferable, and 22% or less is further preferable. When the content of the metal oxide particles is 30% by mass and the optical path length is 2 mm, the metal oxide particle dispersion is blended as long as the liquid haze value of the metal oxide particle dispersion is 35% or less. In the coating, the light of the coating film formed using the coating is moderately scattered, and the coating film is suitable for specifications in optical applications. Further, when used as a protective layer or the like, there is no fear of impairing the design of the underlayer. In the metal oxide particle dispersion of the present embodiment, the content of the metal oxide particles is 10% by mass, and the liquid haze value when the optical path length is 2 mm is preferably 25% or less. % or less is more preferable, and 15% or less is further preferable. When the content of the metal oxide particles is 10% by mass and the optical path length is 2 mm, the metal oxide particle dispersion is blended as long as the liquid haze value of the metal oxide particle dispersion is 25% or less. In the coating, the light of the coating film formed using the coating is moderately scattered, and the coating film is suitable for specifications in optical applications. Further, when used as a protective layer or the like, there is no fear of impairing the design of the underlayer.

Here, the "haze value" means the ratio (%) of the diffused transmitted light to the total light transmitted light. The "liquid haze value" is a haze value of a metal oxide particle dispersion measured by a haze meter (trade name: HAZE METER TC-H3DP, manufactured by Tokyo Denshoku Co., Ltd.) using a small glass tube of 2 mm. .

Further, the metal oxide particle dispersion liquid of the present embodiment may contain other components such as a dispersant, a photosensitizer, and a resin.

[Manufacturing Method of Metal Oxide Particle Dispersion Liquid] The method for producing the metal oxide particle dispersion liquid of the present embodiment is not particularly limited, and for example, a known method for producing a dispersion liquid described in Patent Document 4 can be used. Further, as a method for producing the metal oxide particle dispersion of the present embodiment, for example, after the suspension of the metal oxide particles is prepared, the ruthenium compound is added to the suspension to carry out the metal oxide particles. A method of surface treatment reaction, a method of mixing the components of the metal oxide particle dispersion described above, followed by mechanical mixing.

When a cerium compound is added to the suspension to prepare a surface treatment reaction of the metal oxide particles after the suspension of the metal oxide particles is prepared, in the production of the metal oxide particle dispersion, zirconia beads are preferably used. Bead mills, ball mills, homogenizers, dispersers, mixers, etc. Further, the amine or water may be added to the suspension or may be added during the surface treatment reaction of the metal oxide particles. Further, the amine or water may be added stepwise or continuously in order to adjust the reaction rate of the surface treatment reaction of the metal oxide particles. When the components of the metal oxide particle dispersion described above are blended and mechanically mixed, a bead mill using a medium such as zirconia beads, a ball mill, a homogenizer, a disperser, a stirrer or the like is preferably used. Further, the amine or water may be added stepwise or continuously in order to adjust the reaction rate of the surface treatment reaction of the metal oxide particles.

According to the metal oxide particle dispersion of the present embodiment, an amine having 2 or more carbon atoms is used in the reaction catalyst in an organic solvent having a moderate polarity, whereby the binder can be used without using a binder. 1) The interaction between the ruthenium compound and the covalent bond of the metal oxide particles is shown, and the metal oxide particles are surface-treated with a ruthenium compound. Thereby, a metal oxide particle dispersion liquid having high transparency, excellent dispersion stability of metal oxide particles, and excellent long-term storage stability of the dispersion liquid can be obtained.

[Composition of Metal Oxide Particles] The metal oxide particle-containing composition of the present embodiment contains the metal oxide particle dispersion of the present embodiment and a binder component.

"Binder component" The binder component is not particularly limited, and for example, a resin monomer, a resin oligomer, a resin polymer, an organic cerium compound or a polymer thereof can be preferably used.

The binder component in the use of the display device or the like is not particularly limited as long as it is a monomer, an oligomer or a polymer of a curable resin used in a general hard coat film, and a single photocurable resin can be used. As the monomer, oligomer or polymer, a monomer or oligomer of a thermosetting resin can also be used. Examples of the monomer of the photocurable resin include a radical polymerizable monomer such as a monofunctional acrylate, a bifunctional acrylate, a trifunctional acrylate, or a 4-6 functional acrylate, or an alicyclic epoxy resin. A cationically polymerizable monomer such as a glycidyl ether epoxy resin, a vinyl ether urethane, or a vinyl ether polyester. Examples of the oligomer or polymer of the photocurable resin include epoxy acrylate, acryl urethane, polyester acrylate, copolymer acrylate, polybutadiene acrylate, oxime acrylate, and amino group. A radical polymerization oligomer such as a resin acrylate, a polymer, or a cationic polymerization oligomer such as an alicyclic epoxy resin, a glycidyl ether epoxy resin, a vinyl ether urethane, or a vinyl ether polyester ,polymer. Among these, it is preferable to use a monomer, an oligomer, or a polymer which can easily form a plurality of components and can suppress a radically polymerizable property of a curing failure by using a photoinitiator, a photostabilizer, or the like. In applications requiring scratch resistance and abrasion resistance, a radical polymerizable polyfunctional monomer such as dipentaerythritol hexaacrylate is preferably used.

In applications requiring adhesiveness, flexibility, and low shrinkage, a radical polymerizable oligomer such as acryl urethane or a polymer is preferably used. The monomer, the oligomer, and the polymer of the photopolymerizable resin may be used singly or in combination of two or more kinds depending on the desired function. Examples of the functional group other than the acryloyl group or the methacryl oxime group of the polyfunctional monomer include a vinyl group, an allyl group, an allyl ether group, a styryl group, and a hydroxyl group.

Specific examples of the polyfunctional acrylate include (meth)trimethylolpropane triacrylate, (meth)ditrimethylolpropane tetraacrylate, and (methyl)pentaerythritol triacrylate ( Polyol polyacrylate such as pentaerythritol tetraacrylate or (meth)dipentaerythritol hexaacrylate, epoxy (meth) acrylate, polyester (meth) acrylate, urethane acrylate, polyfluorene Oxyalkyl acrylate and the like. These polyfunctional acrylates may be used alone or in combination of two or more.

In the metal oxide particle-containing composition of the present embodiment, one or two functional groups may be appropriately contained, and the monomer or oligomer or dispersant which is not contained in the above monomer may be appropriately contained in a range which does not inhibit the effects of the invention. , polymerization initiator, antistatic agent, refractive index modifier, antioxidant, ultraviolet absorber, light stabilizer, leveling agent, antifoaming agent, inorganic filler, coupling agent, preservative, plasticizer, flow regulator Various additives such as thickeners, pH adjusters, and polymerization initiators.

Examples of the dispersant include a cationic surfactant such as a sulfate ester, a carboxylic acid or a polycarboxylic acid, a cationic surfactant such as a 4-grade salt of a higher aliphatic amine, and a higher fatty acid polyethylene glycol ester. Nonionic surfactants, lanthanoid surfactants, fluorine-based surfactants, and polymer-based surfactants having a guanamine linkage.

The polymerization initiator can be appropriately selected depending on the kind of the monomer to be used. When a monomer of a photocurable resin is used, a photopolymerization initiator is used. The kind or amount of the photopolymerization initiator can be appropriately selected depending on the monomer of the photocurable resin to be used. Examples of the photopolymerization initiator include a benzophenone type, a diketone type, an acetophenone type, a benzoin type, a thioxanthone type, an anthraquinone type, a benzoin dimethyl ketal type, and an alkylphenol type. A known photopolymerization initiator such as a fluorenylphosphine oxide or a phenylphosphine oxide.

Since the metal oxide particle-containing composition of the present embodiment is applied to a substrate to form a coating film, the viscosity is preferably 0.2 mPa·s or more and 500 mPa·s or less, and 0.5 mPa, in order to facilitate application.・s or more and 200mPa·s or less is more preferable. When the viscosity of the composition containing the metal oxide particles is 0.2 mPa·s or more, the film thickness at the time of forming the coating film is not too thin, and the film thickness can be easily controlled, which is preferable. On the other hand, when the viscosity of the composition containing the metal oxide particles is 500 mPa·s or less, the viscosity does not become excessively high, and the composition containing the metal oxide particles at the time of coating can be easily treated. Preferably.

The viscosity of the composition containing the metal oxide particles is preferably adjusted to the above range by appropriately adding an organic solvent to the composition containing the metal oxide particles. The organic solvent is not particularly limited as long as it has good compatibility with the above-described composition containing metal oxide particles. For example, aliphatic hydrocarbons such as hexane, heptane, and cyclohexane, aromatic hydrocarbons such as toluene and xylene, alcohols such as methanol, ethanol, and propanol, and halogenated products such as dichloromethane and dichloroethane can be given. Ketones such as hydrocarbons, acetone, methyl ethyl ketone, methyl isobutyl ketone, 2-pentanone and isophorone, esters such as ethyl acetate and butyl acetate, cellosolve such as ethyl cellosolve, and propylene glycol An ether such as methyl ether or propylene glycol monoethyl ether, a guanamine solvent or an ether ester solvent. These solvents may be used alone or in combination of two or more.

The metal oxide particle-containing composition of the present embodiment contains the metal oxide particle dispersion of the present invention which has high transparency and excellent dispersion stability of metal oxide particles. Therefore, the dispersion stability of the metal oxide particles is excellent, and the long-term storage stability of the composition is also excellent.

[Manufacturing Method of Composition Containing Metal Oxide Particles] The method for producing the metal oxide particle-containing composition of the present embodiment includes the above-described respective materials as constituent elements of the composition containing metal oxide particles. The method of mechanical mixing. Examples of the mixing device include a stirrer, a rotation-revolving mixer, a homogenizer, and an ultrasonic homogenizer.

[Coating film] The coating film of the present embodiment is formed using the composition containing metal oxide particles of the present embodiment. The film thickness of the coating film can be appropriately adjusted depending on the application, and is usually preferably 0.01 μm or more and 20 μm or less, more preferably 0.5 μm or more and 10 μm or less, and still more preferably 0.5 μm or more and 2 μm or less.

The method for producing a coating film according to the present embodiment includes a step of forming a coating film by applying the composition containing the metal oxide particles to the object to be coated, and a step of curing the coating film. As a coating method for forming a coating film, for example, a bar coating method, a flow coating method, a dip coating method, a spin coating method, a roll coating method, a spray coating method, a face coating method, a gravure coating method, and a suction coating method can be used. A usual wet coating method such as a method or a brush coating method.

The curing method for curing the coating film can be appropriately selected depending on the type of the binder component, and a method of thermal curing or photocuring can be used. The energy ray for photocuring is not particularly limited as long as the coating film is cured. For example, energy rays such as ultraviolet rays, far infrared rays, near ultraviolet rays, infrared rays, X rays, gamma rays, electron beams, proton beams, neutron beams, and the like can be used. Among these energy rays, it is preferred to use ultraviolet rays from the viewpoint of fast curing speed, ease of availability of the device, and ease of handling.

In the case of hardening by ultraviolet irradiation, a high-pressure mercury lamp, a metal halide lamp, a xenon lamp, a chemical lamp or the like using ultraviolet rays having a wavelength band of 200 nm to 500 nm can be used, and energy of 100 to 3,000 mJ/cm ^{2 is used} . The method of irradiating ultraviolet rays, and the like.

The coating film of this embodiment is formed using the above-described composition containing metal oxide particles. As described above, the metal oxide particles contained in the composition containing the metal oxide particles have a sharp particle size distribution, in other words, the size of the metal oxide particles is substantially uniform. Therefore, the metal oxide particles are easily filled in the coating film without gaps. As a result, the obtained coating film is excellent in film formability, and the properties in all parts in the film surface are uniform. Therefore, for example, since the refractive index in the film surface becomes substantially uniform, the generation of the coating film stain is suppressed. When it is applied to a display device or the like, visibility can be improved.

As described above, in the coating film of the present embodiment, since the metal oxide particles having a sharp particle size distribution are used, the metal oxide particles are uniformly filled in the film, and the voids in the film are small. Therefore, for example, when a metal oxide particle having a refractive index of 1.9 or more is used to increase the refractive index, the amount of metal oxide particles required to increase the refractive index can be reduced. Therefore, even in the film of 10 nm to 200 nm, the metal oxide particles are uniformly filled in the entire coating film, and the voids in the film can be uniformly reduced, so that the refractive index of the coating film can be increased. Further, in the coating film of the present embodiment, since the performance in all the portions in the film surface is uniform, even when a thick film having a film thickness of 1 μm or more is formed, occurrence of optical unevenness can be suppressed. In particular, when the ruthenium compound has a functional group containing a polymerizable unsaturated group, since the metal oxide particles are bonded to the resin at the time of hardening, it is possible to suppress aggregation in the film at the time of hardening, or the particle distribution is different on the surface and inside of the film. Therefore, it is preferable. When it is a thick film of 1 μm or more, the ruthenium compound is particularly preferably a functional group containing a polymerizable unsaturated group. That is, the coating film of the present embodiment can be used for a film for adjusting the refractive index. Further, it is also possible to use a thick film which can adjust the refractive index and also has a hard coat property. The coating film of this embodiment can be used for various purposes.

Since the coating film of the present embodiment is formed by using the metal oxide particle-containing composition of the present embodiment, a coating film excellent in transparency and film formability can be obtained.

[Plastic Substrate with Coating Film] The plastic substrate with a coating film of the present embodiment has a base body (plastic substrate) formed using a resin material, and a coating of the embodiment provided on at least one surface of the substrate body. membrane.

The plastic substrate with a coating film can be obtained by applying the metal oxide particle-containing composition of the present embodiment to a substrate body by a known coating method to form a coating film, and curing the coating film.

The substrate body is not particularly limited as long as it is a plastic substrate. For example, polyethylene terephthalate, cellulose triacetate, acrylic acid, acrylic-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, polystyrene, polyethylene, polypropylene, Polycarbonate, vinyl chloride and other plastics. When used as a display device, it is preferred to use a light-transmissive plastic substrate as the substrate body.

The substrate body may be in the form of a sheet or a film, but a film is preferred.

When the measurement is carried out on the basis of air, the haze value of the plastic substrate with a coating film of the present embodiment is preferably 1.4% or less, more preferably 1.0% or less.

Here, the "haze value" refers to the ratio (%) of the diffused transmitted light to the total light transmitted light, and the haze meter NDH-2000 (manufactured by NIPPON DENSHOKU INDUSTRIES Co., LTD) is used based on air. The value measured according to Japanese Industrial Standard JIS-K-7136.

In the plastic substrate with a coating film of this embodiment, a hard coat film may be provided between the plastic substrate and the coating film. The coating film may be laminated with a film having different properties such as a refractive index.

According to the plastic substrate with a coating film of the present invention, since the coating film of the embodiment is formed, a plastic substrate with a coating film excellent in transparency and film formability can be obtained.

[Display Device] The display device of the present embodiment includes either or both of the coating film of the embodiment and the plastic substrate with a coating film of the embodiment. The display device is not particularly limited, and in the present embodiment, a liquid crystal display device for a touch panel will be described.

[Touch Panel] When the refractive index difference between the ITO electrode and the transparent substrate (plastic substrate such as polyethylene terephthalate) is large, the so-called pattern visualization of the ITO electrode portion is easily observed. . Therefore, by providing the coating film of the present embodiment in which the metal oxide particles having a refractive index of 1.9 or more are selected as a layer between the transparent substrate and the ITO electrode, the refractive index of the transparent substrate and the ITO electrode can be relaxed. Poor to suppress pattern visualization. The method of providing one or both of the coating film of the present embodiment and the plastic substrate with a coating film of the present embodiment on the touch panel is not particularly limited. It can be installed by a known method. For example, the ITO electrode is patterned on the surface of the coating film of the plastic substrate with a coating film of the present embodiment, and the structure of the alignment film and the liquid crystal layer is laminated.

The display device of the present embodiment includes either or both of the coating film of the embodiment and the plastic substrate with a coating film of the embodiment which are excellent in transparency and film formability. Since the deviation of the optical characteristics in the surface of the coating film is almost eliminated, it is a display device excellent in visibility. [Examples]

Hereinafter, the present invention will be specifically described by way of Examples and Comparative Examples, but the present invention is not limited to the Examples.

[Example 1] "Metal oxide particle dispersion" Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.) 30% by mass, 3-methylpropenyloxypropyl group 4.5% by mass of trimethoxydecane, 0.1% by mass of alkyldimethylamine (amine value: 140), 0.6% by mass of water, and 64.7% by mass of methyl isobutyl ketone (MIBK), and then subjected to dispersion treatment using a bead mill. The metal oxide particle dispersion of Example 1 was obtained.

"Evaluation of Metal Oxide Particle Dispersion" The result of measuring the moisture content of the obtained metal oxide particle dispersion by Karl Fischer Moisture Analyzer (Model: AQL-22320, manufactured by Hiranoma SANGYO Co., LTD.) The content was 0.6% by mass. Further, the particle size distribution of the obtained metal oxide particle dispersion liquid was measured by a particle size distribution meter (trade name: Microtrac UPA150, manufactured by NIKKISO CO., LTD.). The results are shown in Table 1. In addition, the liquid haze value of the obtained metal oxide particle dispersion liquid was measured by a haze meter (product name: HAZE METER TC-H3DP, manufactured by Tokyo Denshoku Co., Ltd.) using a 2 mm small glass tube. The time-dependent stability of the obtained metal oxide particle dispersion liquid was stored in a refrigerator at 5 ° C for 90 days, and stored in a thermostat bath at 25 ° C for 60 days, and then evaluated by a particle size distribution. When the change of D50 is 5 nm or less, the change of D90 is 10 nm or less, it is set to ○, and the change of D50 exceeds 5 nm or the change of D10 exceeds 10 nm is set to ×. The results are shown in Tables 1 and 2.

[Example 2] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.) 30% by mass, 3-methacryloxypropyltrimethoxydecane 4.5% by mass, The alkyl dimethylamine (amine value: 140) 0.2% by mass, water 0.6% by mass, and methyl ethyl ketone (MEK) 64.7% by mass were mixed, and then subjected to dispersion treatment using a bead mill to obtain a metal oxide particle dispersion liquid of Example 2. The water content, particle size distribution, and stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 1 and 2.

[Example 3] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.) 30% by mass, 3-methacryloxypropyltrimethoxydecane 4.5% by mass, The alkyl dimethylamine (amine value: 140) was 0.3% by mass, water was 0.6% by mass, and methyl ethyl ketone (MEK) was 64.6 mass%, and then subjected to dispersion treatment using a bead mill to obtain a metal oxide particle dispersion liquid of Example 3. The water content, particle size distribution, and stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 1 and 2.

[Example 4] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.), 30% by mass, 3-methacryloxypropyltrimethoxydecane, 4.5% by mass, The alkyl dimethylamine (amine value 140) 0.2% by mass, water 0.6% by mass, and 1-methoxy-2-propanol (PGM) 64.7% by mass were mixed, and then subjected to dispersion treatment using a bead mill to obtain an example. 4 metal oxide particle dispersion. The water content, particle size distribution, and stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 1 and 2.

[Example 5] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.) 30% by mass, 3-methacryloxypropyltrimethoxydecane 4.5% by mass, After alkyl dimethylamine (amine value: 140) 0.1% by mass, water 0.6% by mass, and methyl ethyl ketone (MEK) 64.8% by mass were mixed, and then subjected to dispersion treatment using a bead mill to obtain a metal oxide particle dispersion liquid of Example 5. The water content, particle size distribution, and stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 1 and 2.

[Example 6] 30% by mass of zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.), 3.0% by mass of 3-methacryloxypropyltrimethoxydecane, The alkyl dimethylamine (amine value: 140) 0.2% by mass, water 0.6% by mass, and methyl isobutyl ketone (MIBK) 66.2% by mass were mixed, and then subjected to dispersion treatment using a bead mill to obtain a metal oxide of Example 6. Particle dispersion. The water content, particle size distribution, and stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 1 and 2.

[Example 7] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.), 30% by mass, 3-methacryloxypropyltrimethoxydecane, 4.5% by mass, The polyester acid amide amine salt (amine value 40) 0.4% by mass, water 0.6% by mass, and methyl ethyl ketone (MEK) 64.5% by mass were mixed, and then subjected to dispersion treatment using a bead mill to obtain metal oxide particle dispersion of Example 7. liquid. The water content, particle size distribution, and stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 1 and 2.

[Example 8] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.), 30% by mass, 3-propenyloxypropyltrimethoxydecane, 6.0% by mass, alkyl group Dimethylamine (amine value: 140) 0.3% by mass, water 0.6% by mass, and 1-methoxy-2-propanol (PGM) 63.1% by mass were mixed, and then subjected to dispersion treatment using a bead mill to obtain Example 8 Metal oxide particle dispersion. The water content, the particle size distribution, the liquid haze value, and the stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 1 and 2.

[Example 9] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.), 10% by mass, 3-propenyloxypropyltrimethoxydecane, 1.5% by mass, alkyl group Dimethylamine (amine value: 140) 0.1% by mass, water 0.2% by mass, and methyl isobutyl ketone (MIBK) 88.2% by mass were mixed, and then subjected to dispersion treatment using a bead mill to obtain metal oxide particle dispersion of Example 9. liquid. The water content, particle size distribution, and stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 1 and 2.

[Example 10] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.) 40% by mass, 3-propenyloxypropyltrimethoxydecane 6.0% by mass, alkyl group Dimethylamine (amine value: 140) 0.3% by mass, water 0.8% by mass, and methyl isobutyl ketone (MIBK) 52.9% by mass were mixed, and then subjected to dispersion treatment using a bead mill to obtain metal oxide particle dispersion of Example 10. liquid. The water content, the particle size distribution, the liquid haze value, and the stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 3 and 4.

[Example 11] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.) 40% by mass, 3-propenyloxypropyltrimethoxydecane 6.0% by mass, alkyl group Dimethylamine (amine value: 140) 0.3% by mass, water 0.92% by mass, and methyl isobutyl ketone (MIBK) 52.78% by mass were mixed, and then subjected to dispersion treatment using a bead mill to obtain metal oxide particle dispersion of Example 11. liquid. The water content, particle size distribution, and stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 3 and 4.

[Example 12] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.) 40% by mass, 3-propenyloxypropyltrimethoxydecane 6.0% by mass, alkyl group Dimethylamine (amine value: 140) 0.3% by mass, water 0.95% by mass, and methyl isobutyl ketone (MIBK) 52.75% by mass were mixed, and then subjected to dispersion treatment using a bead mill to obtain metal oxide particle dispersion of Example 12. liquid. The water content, particle size distribution, and stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 3 and 4.

[Example 13] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.) 40% by mass, 3-propenyloxypropyltrimethoxydecane 6.0% by mass, alkyl group After mixing dimethylamine (amine value 140) 0.3% by mass, water 1.8% by mass, and methyl isobutyl ketone (MIBK) 51.9% by mass, the dispersion treatment was carried out using a bead mill to obtain metal oxide particle dispersion of Example 13. liquid. The water content, particle size distribution, and stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 3 and 4.

[Example 14] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.) 30% by mass, 3-propenyloxypropyltrimethoxydecane 4.5% by mass, alkyl group Dimethylamine (amine value: 140): 0.23 mass%, water: 0.6 mass%, and methyl isobutyl ketone (MIBK) 64.67 mass% were mixed, and then subjected to dispersion treatment using a bead mill to obtain metal oxide particle dispersion of Example 14. liquid. The water content, the particle size distribution, the liquid haze value, and the stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 3 and 4.

[Example 15] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.), 30% by mass, 3-propenyloxypropyltrimethoxydecane, 4.5% by mass, alkyl group Dimethylamine (amine value 140) 0.23 mass%, water 0.6 mass%, methyl isobutyl ketone (MIBK) 45.07 mass%, toluene (solubility in water 0.035) 19.6 mass%, and then dispersed using a bead mill The metal oxide particle dispersion of Example 15 was obtained. The water content, the particle size distribution, the liquid haze value, and the stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 3 and 4.

[Example 16] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.), 30% by mass, 3-propenyloxypropyltrimethoxydecane, 4.5% by mass, alkyl group Dimethylamine (amine value 140) 0.23 mass%, water 0.6 mass%, methyl isobutyl ketone (MIBK) 58.17% by mass, toluene (solubility in water 0.035) 6.5% by mass, and then subjected to dispersion treatment using a bead mill The metal oxide particle dispersion of Example 16 was obtained. The water content, the particle size distribution, the liquid haze value, and the stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 3 and 4.

[Example 17] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.), 30% by mass, 3-propenyloxypropyltrimethoxydecane, 4.5% by mass, alkyl group Dimethylamine (amine value: 140): 0.23 mass%, water: 0.6 mass%, methyl isobutyl ketone (MIBK): 45.07 mass%, methanol (SP value: 14.8, boiling point: 65 ° C), 19.6 mass%, after mixing, using a bead mill The machine was subjected to dispersion treatment to obtain a metal oxide particle dispersion of Example 17. The water content, the particle size distribution, the liquid haze value, and the stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 3 and 4.

[Example 18] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.), 30% by mass, 3-propenyloxypropyltrimethoxydecane, 4.5% by mass, alkyl group Dimethylamine (amine value: 140) 0.23 mass%, water 0.6 mass%, methyl isobutyl ketone (MIBK) 58.17% by mass, methanol (SP value: 14.8, boiling point 65 ° C) 6.5% by mass, after mixing, using a bead mill The machine was subjected to dispersion treatment to obtain a metal oxide particle dispersion of Example 18. The water content, the particle size distribution, the liquid haze value, and the stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 3 and 4.

[Comparative Example 1] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.) 40% by mass, 3-propenyloxypropyltrimethoxydecane 6.0% by mass, alkyl group After mixing dimethylamine (amine value: 140), 0.3% by mass of water, 2.3% by mass of water, and 51.4% by mass of methyl isobutyl ketone (MIBK), dispersion treatment was carried out using a bead mill to obtain dispersion of metal oxide particles of Comparative Example 1. liquid. The water content, particle size distribution, and stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 5 and 6.

[Comparative Example 2] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.) 40% by mass, 3-propenyloxypropyltrimethoxydecane 6.0% by mass, alkyl group After mixing dimethylamine (amine value: 140), 0.3% by mass of water, 2.3% by mass of water, and 50.9% by mass of methyl isobutyl ketone (MIBK), the dispersion treatment was carried out using a bead mill to obtain dispersion of metal oxide particles of Comparative Example 2. liquid. The water content, particle size distribution, and stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 5 and 6.

[Comparative Example 3] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.), 30% by mass, 3-methacryloxypropyltrimethoxydecane, 4.5% by mass, After mixing 0.6% by mass of water and 64.9% by mass of methyl ethyl ketone (MEK), the dispersion treatment was carried out using a bead mill to obtain a metal oxide particle dispersion liquid of Comparative Example 3. The water content, the particle size distribution, the liquid haze value, and the stability over time of the obtained metal oxide particle dispersion liquid were measured in the same manner as in Example 1. The results are shown in Tables 5 and 6.

[Comparative Example 4] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.), 30% by mass, 3-methacryloxypropyltrimethoxydecane, 4.5% by mass, 1% acetic acid 3.0% by mass, water 0.6% by mass, and 1-methoxy-2-propanol (PGM) 61.9% by mass were mixed, and then subjected to dispersion treatment using a bead mill, but the particles were sedimented, and metal oxide was not obtained. Particle dispersion.

[Comparative Example 5] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.), 30% by mass, 3-methacryloxypropyltrimethoxydecane, 4.5% by mass, After alkyl dimethylamine (amine value 140) 0.05% by mass, water 0.6% by mass, and methyl ethyl ketone (MEK) 64.85 mass% were mixed, and then subjected to dispersion treatment using a bead mill, but the particles were sedimented, and metal oxide particle dispersion could not be obtained. liquid.

[Comparative Example 6] Zirconium oxide (IV) (average primary particle diameter: 12 nm, manufactured by SUMITOMO OSAKA CEMENT Co., Ltd.), 30% by mass, 3-propenyloxypropyltrimethoxydecane, 4.5% by mass, alkyl group Dimethylamine (amine value 140) 0.23 mass%, water 0.6 mass%, methyl isobutyl ketone (MIBK) 32.6% by mass, toluene (solubility in water 0.035) 32.07 mass%, and then subjected to dispersion treatment using a bead mill However, the particles settled and the metal oxide particle dispersion could not be obtained.

[Example 19] "Composition containing metal oxide particles" 62% by mass of the zirconia dispersion of Example 10, and urethane acrylate (weight average molecular weight (MW) 20,000 to 40,000) 10.6% by mass, polymerization initiation 0.6% by mass of the agent, 0.1% by mass of a polymerization accelerator, 6% by mass of isopropyl alcohol, and 20.7% by mass of methyl isobutyl ketone were mixed to obtain a metal oxide particle-containing composition of Example 19. In the composition, the solid content of the component other than the solvent was 40% by mass, and the content of the zirconia in 100% by mass of the solid component was 62% by mass. The particle size distribution of the obtained composition was measured in the same manner as in Example 1. The D50 was 11 nm, the D90 was 16 nm, and the D90/D50 was 1.5.

"Coating film" The obtained metal oxide particle-containing composition was applied onto a polyethylene terephthalate film having a thickness of 50 μm by a bar coating method so that the dried film thickness was 1 μm. It was dried by heating at 90 ° C for 1 minute to form a coating film. Next, a high pressure mercury lamp (120 W/cm) was used, and the ultraviolet ray was exposed to the coating film so as to be an energy of 250 mJ/cm ² to cure the coating film, thereby obtaining a coated plastic substrate of Example 19.

"Evaluation of Plastic Substrate with Coating Film" "Total Light Transmittance, Haze Value" Using a haze meter NDH-2000 (manufactured by NIPPON DENSHOKU INDUSTRIES Co., LTD) based on air, according to Japanese Industrial Standard JIS- K-7136 measures the total light transmittance and haze value of a plastic substrate with a coating film. In the measurement of the total light transmittance and the haze value, a test piece of 100 mm × 100 mm was produced from the produced plastic substrate with a coating film, and the test piece was used. As a result, the total light transmittance was 89.3%, and the haze value was 0.73%.

"Scratch resistance" The scratch resistance of a plastic substrate with a coating film was evaluated. A coating surface of a plastic substrate with a coating film was applied with a load of 250 g/cm ² using a friction tester (manufactured by TAIHEI CHEMICAL INDUSTRIAL CO., LTD.) equipped with #0000, and reciprocated 10 times. Next, the number of the number of scars counted by visual observation was 10 or less.

[Example 20] 71.3 mass% of the zirconium oxide dispersion of Example 10, 16.3% by mass of dipentaerythritol hexaacrylate, 0.6% by mass of a polymerization initiator, 0.1% by mass of a polymerization accelerator, 5% by mass of isopropyl alcohol, and methyl group The isobutyl ketone was mixed at 6.7% by mass to obtain a metal oxide particle-containing composition of Example 20. In the composition, the solid content of the component other than the solvent was 50% by mass, and the content of the zirconia in 100% by mass of the solid component was 57% by mass. The particle size distribution of the obtained composition was measured in the same manner as in Example 1. The D50 was 11 nm, the D90 was 16 nm, and the D90/D50 was 1.5.

"Evaluation of Storage Stability of Composition Containing Metal Oxide Particles" The storage stability of the obtained composition was stored in a refrigerator at 5 ° C for 90 days, and stored in a thermostat at 25 ° C for 60 days. Evaluation was carried out by particle size distribution. The particle size distribution of the composition was measured in the same manner as in Example 1. The D50 was 16 nm, the D90 was 25 nm, and the D90/D50 was 1.6. Further, a plastic substrate with a coating film of Example 20 was obtained in the same manner as in Example 19 except that the metal oxide particle-containing composition of Example 20 was used. The total light transmittance and the haze value were measured in the same manner as in Example 1 for the plastic substrate with a coating film. As a result, the total light transmittance was 89.5%, and the haze value was 0.85%. Further, in the same manner as in Example 19, the scratch resistance of the coated plastic substrate of Example 20 was evaluated. As a result, the number of visually counted scars was 10 or less.

[Experimental Example 1] The date on which the composition containing the metal oxide particles of Example 19 was prepared was taken as 0 days of storage. The particle size distribution of the composition was measured in the same manner as in Example 1. Further, the total light transmittance and the haze value of the plastic substrate with a coating film produced in the same manner as in Example 19 using the composition were measured. Further, in the same manner as in Example 19, the scratch resistance of the plastic substrate with a coating film was evaluated. As a result, the number of visually counted scars was 10 or less. The results are shown in Table 7.

[Experimental Example 2] The metal oxide particle-containing composition of Example 19 was stored in a thermostat at 5 ° C for 30 days, and then the particle size distribution was measured in the same manner as in Example 1. Further, the total light transmittance and the haze value of the plastic substrate with a coating film produced in the same manner as in Example 19 using the composition were measured. Further, in the same manner as in Example 19, the scratch resistance of the plastic substrate with a coating film was evaluated. As a result, the number of visually counted scars was 10 or less. The results are shown in Table 7.

[Experimental Example 3] The composition containing the metal oxide particles of Example 19 was stored in a thermostat at 5 ° C for 60 days, and then the particle size distribution was measured in the same manner as in Example 1. Further, the total light transmittance and the haze value of the plastic substrate with a coating film produced in the same manner as in Example 19 using the composition were measured. Further, in the same manner as in Example 19, the scratch resistance of the plastic substrate with a coating film was evaluated. As a result, the number of visually counted scars was 10 or less. The results are shown in Table 7.

[Experimental Example 4] The composition containing the metal oxide particles of Example 19 was stored in a constant temperature bath at 5 ° C for 90 days, and then the particle size distribution was measured in the same manner as in Example 1. Further, the total light transmittance and the haze value of the plastic substrate with a coating film produced in the same manner as in Example 19 using the composition were measured. Further, in the same manner as in Example 19, the scratch resistance of the plastic substrate with a coating film was evaluated. As a result, the number of visually counted scars was 10 or less. The results are shown in Table 7.

[Experimental Example 5] The metal oxide particle-containing composition of Example 19 was stored in a thermostat at 25 ° C for 30 days, and then the particle size distribution was measured in the same manner as in Example 1. Further, the total light transmittance and the haze value of the plastic substrate with a coating film produced in the same manner as in Example 19 using the composition were measured. Further, in the same manner as in Example 19, the scratch resistance of the plastic substrate with a coating film was evaluated. As a result, the number of visually counted scars was 10 or less. The results are shown in Table 7.

[Experimental Example 6] The composition containing the metal oxide particles of Example 19 was stored in a thermostat at 25 ° C for 60 days, and then the particle size distribution was measured in the same manner as in Example 1. Further, the total light transmittance and the haze value of the plastic substrate with a coating film produced in the same manner as in Example 19 using the composition were measured. Further, in the same manner as in Example 19, the scratch resistance of the plastic substrate with a coating film was evaluated. As a result, the number of visually counted scars was 10 or less. The results are shown in Table 7.

[Experimental Example 7] The composition containing the metal oxide particles of Example 19 was stored in a thermostat at 25 ° C for 90 days, and then the particle size distribution was measured in the same manner as in Example 1. Further, the total light transmittance and the haze value of the plastic substrate with a coating film produced in the same manner as in Example 19 using the composition were measured. Further, in the same manner as in Example 19, the scratch resistance of the plastic substrate with a coating film was evaluated. As a result, the number of visually counted scars was 10 or less. The results are shown in Table 7.

[Experimental Example 8] The metal oxide particle-containing composition of Example 19 was stored in a thermostat at 35 ° C for 30 days, and then the particle size distribution was measured in the same manner as in Example 1. Further, the total light transmittance and the haze value of the plastic substrate with a coating film produced in the same manner as in Example 19 using the composition were measured. Further, in the same manner as in Example 19, the scratch resistance of the plastic substrate with a coating film was evaluated. As a result, the number of visually counted scars was 10 or less. The results are shown in Table 7.

[Experimental Example 9] The composition containing the metal oxide particles of Example 19 was stored in a thermostat at 35 ° C for 60 days, and then the particle size distribution was measured in the same manner as in Example 1. Further, the total light transmittance and the haze value of the plastic substrate with a coating film produced in the same manner as in Example 19 using the composition were measured. Further, in the same manner as in Example 19, the scratch resistance of the plastic substrate with a coating film was evaluated. As a result, the number of visually counted scars was 10 or less. The results are shown in Table 7.

[Experimental Example 10] The composition containing the metal oxide particles of Example 19 was stored in a thermostat at 35 ° C for 90 days, and then the particle size distribution was measured in the same manner as in Example 1. Further, the total light transmittance and the haze value of the plastic substrate with a coating film produced in the same manner as in Example 19 using the composition were measured. Further, in the same manner as in Example 19, the scratch resistance of the plastic substrate with a coating film was evaluated. As a result, the number of visually counted scars was 10 or less. The results are shown in Table 7.

[Table 1]

[Table 2]

[table 3]

[Table 4]

[table 5]

[Table 6]

[Table 7]

From the results of Tables 1 to 6, it was confirmed that the metal oxide particles of the metal oxide particle dispersions of Examples 1 to 18 were excellent in dispersion stability when Comparative Examples 1 to 18 and Comparative Examples 1 to 6 were compared, and The dispersion has excellent long-term storage stability. From the results of Table 7, it was confirmed that the metal oxide particle-containing composition of Example 19 was excellent in storage stability. Further, it is understood that the plastic substrate with a coating film produced by using the composition containing the metal oxide particles of Example 19 is excellent in transparency and excellent in scratch resistance. [Industrial use possibilities]

The metal oxide particle dispersion of the present invention can be applied to all industrial applications in which a metal oxide particle dispersion is conventionally used, and can be suitably used, for example, in an optical film application, a house exterior application, or a heat shield application.

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Claims (7)

A metal oxide particle dispersion liquid obtained by dispersing metal oxide particles surface-treated with a ruthenium compound represented by the following formula (1) in a solvent, wherein the metal oxide particle dispersion liquid is further An amine having 2 or more carbon atoms, the metal oxide particles having an average primary particle diameter of 3 nm or more and 20 nm or less, a refractive index of 1.9 or more, the solvent containing 70% by mass or more of an organic solvent, and a solubility parameter of the organic solvent. is 8.0 or more and 12 or less, water solubility of 1.5g / 100ml or more, the water content is 3 mass content of the metal oxide particles% or _{less, R 'n Si (OR)} m ...... (1) wherein, R Is a hydrogen atom or an alkyl group, R' is an organic group, n and m are integers, n+m=4, 0<n<4. The metal oxide particle dispersion according to claim 1, wherein the particle diameter (D90) when the cumulative volume fraction of the particle size distribution is 90% is 60 nm or less. The liquid oxide haze of the metal oxide particle dispersion according to the first or second aspect of the invention, wherein the content of the metal oxide particles is 30% by mass and the optical path length is 2 mm. The value is 35% or less. The metal oxide particle dispersion according to the first or second aspect of the invention, wherein the product of the amine value of the amine and the amine content is 10 or more and 45 or less. A composition containing metal oxide particles, characterized in that the metal oxide particle-containing composition contains the metal oxide particle dispersion and the binder component as described in claim 1 or 2; to make. A coating film formed by using a composition containing metal oxide particles as described in claim 5 of the patent application. A display device comprising the coating film according to claim 6 of the patent application.