Metal oxide fine particle dispersion and curable composition containing the same

Abstract

To provide a dispersing element of metal oxide fine particles having favorable yellow discoloration resistance, alkali resistance and capable of forming an index matching layer capable of making a patterned transparent conductive layer hardly visible, and to provide a curable composition including the dispersing element.SOLUTION: There is provided a metal oxide fine particle-dispersing element including the dispersant including as effective ingredients, fine particles A of at least one metal oxide selected from zirconium oxide and barium titanate, fine particles B of a metal oxide having an absorption maximum wavelength at a zone less than 390nm, organic metallic compounds, solvents and a block copolymer which has a linear structure having a first block having at least one selected from specific amide group-including constitutional units at one end and has no basic group.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a metal oxide microparticle dispersion and a curable composition containing the same, and more particularly to a metal oxide microparticle dispersion applicable to the production of, for example, an optical adjustment (index matching) layer of a touch panel, and a curable composition containing the same. [Background technology]

[0002] In recent years, capacitive touch panels have been adopted for display devices such as various portable terminals and personal computers. These capacitive touch panels use a transparent conductive film provided with a patterned transparent conductive layer for input position detection. Such conductive films, for example, have a configuration in which a transparent substrate, a patterned transparent conductive layer made of a transparent conductive material such as indium tin oxide (ITO) provided on the surface of the transparent substrate, and a dielectric layer is laminated on the transparent conductive layer. This results in a difference in refractive index between the area where the transparent conductive layer is present and the area where it is not. This difference in refractive index also results in a difference in light reflectance, making the patterned transparent conductive layer visible when viewed from the outer surface of the touch panel, which can make the displayed image difficult to see.

[0003] As a solution to this problem, it has been proposed to provide an index matching (IM) layer such as an anti-reflection layer on the side of the transparent conductive layer opposite the external incident light side in order to eliminate the difference in refractive index that occurs between areas where the transparent conductive layer exists and areas where it does not, thereby eliminating the difference in light reflectance (Patent Document 1).

[0004] Patent Document 1 discloses a transparent conductive laminate film having a structure in which a high-refractive index layer, a low-refractive index layer, and a transparent conductive thin film layer are laminated in this order on a substrate made of a transparent plastic film, the high-refractive index layer having a refractive index of 1.70 to 2.50 and a film thickness of 4 to 20 nm, and the low-refractive index layer having a refractive index of 1.30 to 1.60 and a film thickness of 20 to 50 nm. Specific examples of materials for the high-refractive index layer include TiO2, Nb2O5, ZrO2, Ta2O5, ZnO, In2O3, SnO2, and composite oxides thereof. Specific examples of materials for the low-refractive index layer include transparent metal oxides such as SiO2 and Al2O3, and composite metal oxides such as SiO2-Al2O3. Furthermore, with this structure, when the transparent conductive thin film layer is patterned, the difference in optical properties between the portion with and without the transparent conductive thin film layer is small, so that the patterning of the transparent conductive thin film layer is not visible even when placed in front of a display such as a liquid crystal display, thereby suppressing a decrease in visibility.

[0005] In addition, anti-reflection layers and the like that are applied to the display surfaces of display devices such as televisions and personal computers for the purpose of preventing reflection of light rays from various external light sources on the display devices and improving the visibility of the displayed images are known (Patent Documents 2 and 3).

[0006] Patent Document 2 proposes an antireflection laminate including a coating film formed by one coating process using a coating composition in which multiple types of fine particles with different specific gravities and refractive indices are dispersed in a binder resin, whereby, due to the difference in specific gravities, low-refractive-index fine particles are unevenly distributed in the upper to middle portions of the coating film, and medium- to high-refractive-index fine particles are unevenly distributed in the middle to lower portions. It also discloses that the low-refractive-index fine particles are selected from silica fine particles, polymer fine particles, and metal fluoride fine particles, and the medium- to high-refractive-index fine particles are selected from titanium oxide, zirconium oxide, cerium oxide, tin oxide, antimony tin oxide, indium tin oxide, antimony oxide, aluminum zinc oxide, and gallium zinc oxide fine particles. It is also disclosed that this configuration allows an antireflection layer to be formed by one coating process, and also eliminates the problem of peeling between the refractive index layers compared to conventional antireflection layers with clear boundaries formed by multilayer coating.

[0007] Patent Document 3 discloses a cured product obtained by coating or printing a zirconium oxide particle-containing photocurable composition onto a substrate and curing it, the photocurable composition comprising predetermined amounts of zirconium oxide particles, a metal complex, an active energy ray-curable compound, a photopolymerization initiator, and a dispersion medium, wherein the metal complex comprises a metal selected from the group consisting of zirconium, titanium, chromium, manganese, iron, cobalt, nickel, copper, vanadium, aluminum, zinc, indium, tin, and platinum, and a ligand selected from the group consisting of β-ketones, and the dispersion medium is water, alcohols, ketones, esters, ethers, aromatic hydrocarbons, or amides. This cured product has excellent transparency and a high refractive index, and is said to be suitable for anti-reflection coatings applied to the display surfaces of display devices, etc.

[0008] Patent Document 4 discloses an antireflective transparent conductive laminate film comprising a hard-coated film, a transparent conductive layer containing fine particles of at least one metal, at least one transparent antireflective layer formed on the outer layer of the transparent conductive layer and having a refractive index different from that of the transparent conductive layer, and an antifouling layer formed on the outermost layer. The hard-coated film is also described as comprising at least one inorganic fine particle selected from aluminum oxide, silicon dioxide, titanium dioxide, and zirconium oxide, a surface treatment agent for the inorganic fine particles, and a polyfunctional polymerizable unsaturated bond-containing compound, the inorganic fine particles having been surface-treated in the presence of at least the surface treatment agent. After the surface treatment of the inorganic fine particles, a polymerization initiator is added to form a hard-coat coating solution, which is then applied to a transparent substrate, dried, and then irradiated with UV light to form a cured layer. Such hard-coated films are said to have excellent mechanical properties and are free of surface defects. Examples of transparent anti-reflection layers include organic synthetic resins such as polyester resin, acrylic resin, epoxy resin, melamine resin, polyurethane resin, polyvinyl butyral resin, and ultraviolet curable resin; hydrolyzates of metal alkoxides such as silicon; organic / inorganic compounds such as silicone monomers and silicone oligomers; and transparent oxide coatings formed by sol-gel reactions of silica, alumina, titania, zirconia, or mixtures thereof. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-15861 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-121993 [Patent Document 3] Patent No. 4817254 [Patent Document 4] Japanese Patent Application Laid-Open No. 2001-272502 Summary of the Invention [Problem to be solved by the invention]

[0010] As described above, transparent conductive films used in capacitive touch panels have a patterned transparent conductive layer formed on the surface of a transparent substrate. Various methods for forming such transparent conductive layers are known, but photolithography, for example, involves the following steps: (i) A transparent conductive layer made of a transparent conductive material such as indium tin oxide (ITO) is formed over a predetermined area of ​​the entire surface of the transparent substrate according to a standard method; (ii) After performing an annealing treatment as needed, the transparent conductive layer is exposed, developed, and etched to remove unnecessary portions from the transparent conductive layer, thereby forming a transparent conductive layer (pattern electrode) with a predetermined pattern on the surface of the transparent substrate. After these steps, a dielectric layer is provided on the opposite side of the transparent substrate to cover the patterned transparent conductive layer, thereby forming a transparent conductive film.

[0011] When forming a transparent conductive film by photolithography, the IM layer is disposed between the transparent conductive layer and the transparent substrate. Therefore, the IM layer must be resistant to yellowing caused by ultraviolet (UV) irradiation during exposure (yellowing resistance) and to clouding caused by contact with an alkaline developer during development (alkali resistance).

[0012] The invention described in Patent Document 1 discloses that the high refractive index layer and low refractive index layer serving as the IM layer are formed by depositing a specified inorganic substance by sputtering, and although this is considered to have a certain degree of resistance to yellowing and alkali, the effect of making the patterned transparent conductive layer less visible may not necessarily be sufficient.

[0013] The inventions described in Patent Documents 2 to 4 are intended to be placed on the surface of a display device screen, and do not anticipate patterning the transparent conductive layer for detecting input positions on a touch panel. In other words, there is no need to consider the yellowing resistance and alkali resistance required when forming a patterned transparent conductive layer.

[0014] Therefore, an object of the present invention is to provide a metal oxide microparticle dispersion capable of forming an index-matching layer that has good yellowing resistance and alkali resistance and can make a patterned transparent conductive layer less visible, and a curable composition containing the same. [Means for solving the problem]

[0015] The present inventors have conducted extensive research to solve the above-mentioned problems. As a result, they have found that the above-mentioned problems can be solved by a dispersion containing two specific metal oxides, an organometallic compound, a solvent, and a specific dispersant, and a curable composition containing the dispersion. The gist of the present invention is as follows.

[0016] [1] Fine particles A of at least one metal oxide A selected from zirconium oxide and barium titanate; fine particles B of metal oxide B having an absorption maximum wavelength of less than 390 nm; organometallic compounds, a solvent, and A metal oxide fine particle dispersion containing a dispersant containing, as an active ingredient, a block copolymer having a linear structure with a first block at one end thereof, the first block having at least one type of structural unit selected from the structural units represented by the following formulas (1), (2), and (2-2), and having no basic group:

[0017] [ka]

[0018] (In formula (1), R 1a , R 1b R each independently represents a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms, and at least one of them is not a hydrogen atom. 1a , R 1b The hydrogen atoms directly bonded to the carbon atoms in each hydrocarbon group are -C(=O)-NR 5a R 5b , -OC(=O)-NR 6a R 6b , -NR7 -C(=O)-NR 8a R 8b , a cyclic amide group, -OH, or -COOH; and when the aliphatic hydrocarbon group has 2 to 12 carbon atoms, the carbon-carbon bond may contain at least one double bond, and -CH2- constituting the aliphatic hydrocarbon group may be replaced by -O-, -C(=O)-, -C(=O)-O-, -OC(=O)-, or -C(=O)-NR 9 -, -NR 10 -C(=O)-, -NR 11 -C(=O)-O-, -OC(=O)-NR 12 -or-NR 13 -C(=O)-NR 14 - may be replaced with R 5a ~R 14 each independently represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms, and R 5a and R 5b , R 6a and R 6b and R 8a and R 8b At least one of each is not a hydrogen atom, and R 7 and R 8a or R 8b , R 13 and R 14 may be linked to each other via a divalent hydrocarbon group having 1 to 4 carbon atoms to form a ring structure. 1a and R 1b In the formula, aliphatic hydrocarbon groups having 1 to 4 carbon atoms may be linked to each other via -O- to form a ring structure. R 2 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms.

[0019] [ka]

[0020] (In formula (2), R 3 represents a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms which contains an amide group which may have an N-H bond, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms which contains an amide group which may have an N-H bond. An aliphatic hydrocarbon group is one in which the hydrogen atoms directly bonded to the carbon atoms contained in the hydrocarbon group are -C(=O)-NR 15a R 15b , -OC(=O)-NR 16a R 16b , -NR 17 -C(=O)-NR 18a R 18b , a cyclic amide group, -OH or -COOH may be substituted, and -CH2- constituting the aliphatic hydrocarbon group may be -O-, -C(=O)-, -C(=O)-O-, -OC(=O)-, -C(=O)-NR 19 -, -NR 20 -C(=O)-, -NR 21 -C(=O)-O-, -OC(=O)-NR 22 -or-NR 23 -C(=O)-NR 24 - may be replaced with R 15a ~R 24 each independently represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms, and R 17 and R 18a or R 18b , R 23 and R 24 may each form a ring structure by linking the nitrogen atoms together via a divalent hydrocarbon group having 1 to 4 carbon atoms. Furthermore, when the aliphatic hydrocarbon group has 2 to 12 carbon atoms, the carbon-carbon bond may contain at least one double bond. Aromatic hydrocarbon groups are those in which the hydrogen atoms directly bonded to the carbon atoms in the hydrocarbon group are -C(=O)-NR 25a R 25b , -OC(=O)-NR 26a R 26b , -NR 27 -C(=O)-NR 28a R 28b , a cyclic amide group, -OH, or -COOH. 25a ~R 28b each independently represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms; R 27 and R 28a or R 28bmay form a ring structure by linking the nitrogen atoms together via a divalent hydrocarbon group having 1 to 4 carbon atoms. R 4 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms.

[0021] [ka]

[0022] (In formula (2-2), R 29 , R 45 each independently represents a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms, and at least one of them is not a hydrogen atom. An aliphatic hydrocarbon group is one in which the hydrogen atoms directly bonded to the carbon atoms contained in the hydrocarbon group are -C(=O)-NR 31a R 31b , -OC(=O)-NR 32a R 32b , -NR 33 -C(=O)-NR 34a R 34b , a cyclic amide group, -OH or -COOH may be substituted, and -CH2- constituting the aliphatic hydrocarbon group may be -O-, -C(=O)-, -C(=O)-O-, -OC(=O)-, -C(=O)-NR 35 -, -NR 36 -C(=O)-, -NR 37 -C(=O)-O-, -OC(=O)-NR 38 -or-NR 39 -C(=O)-NR 40 - may be replaced with R 31a ~R 40 each independently represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms, and R 33 and R 34a or R 34b , R 39 and R 40may each form a ring structure by linking the nitrogen atoms together via a divalent hydrocarbon group having 1 to 4 carbon atoms. Furthermore, when the aliphatic hydrocarbon group has 2 to 12 carbon atoms, the carbon-carbon bond may contain at least one double bond. Aromatic hydrocarbon groups are those in which the hydrogen atoms directly bonded to the carbon atoms in the hydrocarbon group are -C(=O)-NR 41a R 41b , -OC(=O)-NR 42a R 42b , -NR 43 -C(=O)-NR 44a R 44b , a cyclic amide group, -OH, or -COOH. 41a ~R 44b each independently represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms; R 43 and R 44a or R 44b may form a ring structure by linking the nitrogen atoms together via a divalent hydrocarbon group having 1 to 4 carbon atoms. R 30 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms. [2] The metal oxide fine particle dispersion according to the above item [1], wherein the metal oxide B is at least one selected from titanium oxide and zinc oxide. [3] The metal oxide fine particle dispersion according to the above item [1] or [2], wherein the organometallic compound is at least one selected from organoaluminum compounds and organozirconium compounds. [4] The structural unit represented by the formula (1) is 1a and R 1b is a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms which may contain an amide group having no N-H bond, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms which may contain an amide group having no N-H bond, The structural unit represented by the formula (2) is 3 is a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms and containing an amide group having no N-H bond, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms and containing an amide group having no N-H bond, The structural unit represented by the formula (2-2) is 29 and R 45 is a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms which may contain an amide group having no N-H bond, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms which may contain an amide group having no N-H bond. [5] The dispersion of metal oxide fine particles according to any one of the above items [1] to [4], wherein the block copolymer contains a second block having a structural unit derived from a monomer having a polymerizable double bond. [6] The metal oxide fine particle dispersion according to the above item [5], wherein the monomer having a polymerizable double bond is at least one selected from the group consisting of nonionic water-soluble compounds and nonionic water-insoluble compounds. [7] A curable composition comprising the metal oxide fine particle dispersion according to any one of the above items [1] to [6] and a coating film-forming component. [8] The curable composition according to the preceding item [7], wherein the coating film-forming component contains, as monomer components, polyene monomers and polyfunctional thiol. [9] The curable composition according to the above item [7] or [8], which is used for forming an index matching layer. [Effects of the Invention]

[0023] According to the present invention, it is possible to provide a metal oxide microparticle dispersion capable of forming an index matching layer that has good yellowing resistance and alkali resistance and can make a patterned transparent conductive layer less visible, and a curable composition containing the same. DETAILED DESCRIPTION OF THE INVENTION

[0024] A metal oxide microparticle dispersion (hereinafter sometimes simply referred to as "dispersion") according to an embodiment of the present invention contains microparticles A of at least one metal oxide A selected from zirconium oxide and barium titanate, microparticles B of metal oxide B having an absorption maximum wavelength of less than 390 nm, an organometallic compound, a solvent, and a dispersant containing, as an active ingredient, a block copolymer (hereinafter referred to as "block copolymer A") having a linear structure at one end of which is a first block having at least one structural unit selected from those represented by the following formulas (1), (2), and (2-2) and having no basic group:

[0025] [ka]

[0026] (In formula (1), R 1a , R 1b R each independently represents a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms, and at least one of them is not a hydrogen atom. 1a , R 1b The hydrogen atoms directly bonded to the carbon atoms in each hydrocarbon group are -C(=O)-NR 5a R 5b , -OC(=O)-NR 6a R 6b , -NR 7 -C(=O)-NR 8a R 8b , a cyclic amide group, -OH, or -COOH; and when the aliphatic hydrocarbon group has 2 to 12 carbon atoms, the carbon-carbon bond may contain at least one double bond, and -CH2- constituting the aliphatic hydrocarbon group may be replaced by -O-, -C(=O)-, -C(=O)-O-, -OC(=O)-, or -C(=O)-NR 9 -, -NR 10 -C(=O)-, -NR 11 -C(=O)-O-, -OC(=O)-NR 12 -or-NR 13 -C(=O)-NR 14 - may be replaced with R 5a ~R14 each independently represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms, and R 5a and R 5b , R 6a and R 6b and R 8a and R 8b At least one of each is not a hydrogen atom, and R 7 and R 8a or R 8b , R 13 and R 14 may be linked to each other via a divalent hydrocarbon group having 1 to 4 carbon atoms to form a ring structure. 1a and R 1b In the formula, aliphatic hydrocarbon groups having 1 to 4 carbon atoms may be linked to each other via -O- to form a ring structure. R 2 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms.

[0027] [ka]

[0028] (In formula (2), R 3 represents a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms which contains an amide group which may have an N-H bond, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms which contains an amide group which may have an N-H bond. An aliphatic hydrocarbon group is one in which the hydrogen atoms directly bonded to the carbon atoms contained in the hydrocarbon group are -C(=O)-NR 15a R 15b , -OC(=O)-NR 16a R 16b , -NR 17 -C(=O)-NR 18a R 18b , a cyclic amide group, -OH or -COOH may be substituted, and -CH2- constituting the aliphatic hydrocarbon group may be -O-, -C(=O)-, -C(=O)-O-, -OC(=O)-, -C(=O)-NR 19 -, -NR 20 -C(=O)-, -NR 21 -C(=O)-O-, -OC(=O)-NR 22-or-NR 23 -C(=O)-NR 24 - may be replaced with R 15a ~R 24 each independently represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms, and R 17 and R 18a or R 18b , R 23 and R 24 may each form a ring structure by linking the nitrogen atoms together via a divalent hydrocarbon group having 1 to 4 carbon atoms. Furthermore, when the aliphatic hydrocarbon group has 2 to 12 carbon atoms, the carbon-carbon bond may contain at least one double bond. Aromatic hydrocarbon groups are those in which the hydrogen atoms directly bonded to the carbon atoms in the hydrocarbon group are -C(=O)-NR 25a R 25b , -OC(=O)-NR 26a R 26b , -NR 27 -C(=O)-NR 28a R 28b , a cyclic amide group, -OH, or -COOH. 25a ~R 28b each independently represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms; R 27 and R 28a or R 28b may form a ring structure by linking the nitrogen atoms together via a divalent hydrocarbon group having 1 to 4 carbon atoms. R 4 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms.

[0029] [ka]

[0030] (In formula (2-2), R 29 , R 45 each independently represents a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms, and at least one of them is not a hydrogen atom. An aliphatic hydrocarbon group is one in which the hydrogen atoms directly bonded to the carbon atoms contained in the hydrocarbon group are -C(=O)-NR 31a R 31b , -OC(=O)-NR 32a R 32b , -NR 33 -C(=O)-NR 34a R 34b , a cyclic amide group, -OH or -COOH may be substituted, and -CH2- constituting the aliphatic hydrocarbon group may be -O-, -C(=O)-, -C(=O)-O-, -OC(=O)-, -C(=O)-NR 35 -, -NR 36 -C(=O)-, -NR 37 -C(=O)-O-, -OC(=O)-NR 38 -or-NR 39 -C(=O)-NR 40 - may be replaced with R 31a ~R 40 each independently represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms, and R 33 and R 34a or R 34b , R 39 and R 40 may each form a ring structure by linking the nitrogen atoms together via a divalent hydrocarbon group having 1 to 4 carbon atoms. Furthermore, when the aliphatic hydrocarbon group has 2 to 12 carbon atoms, the carbon-carbon bond may contain at least one double bond. Aromatic hydrocarbon groups are those in which the hydrogen atoms directly bonded to the carbon atoms in the hydrocarbon group are -C(=O)-NR 41a R 41b , -OC(=O)-NR 42a R 42b , -NR 43 -C(=O)-NR 44a R 44b , a cyclic amide group, -OH, or -COOH. 41a ~R 44b each independently represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms; R 43 and R 44a or R 44bmay form a ring structure by linking the nitrogen atoms together via a divalent hydrocarbon group having 1 to 4 carbon atoms. R 30 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms.

[0031] Thus, by combining a specific metal oxide A, a specific metal oxide B, an organometallic compound, and a specific dispersant, a dispersion in which the metal oxides A and B are well dispersed can be obtained. A dispersion containing these components can impart good yellowing resistance and alkali resistance to the index-matching layer and make the transparent conductive layer less visible. These effects are believed to be achieved only when the components have the following functions (i) to (iv) and when the components act synergistically. (i) The fine particles A of the specific metal oxide A have a refractive index higher than that of the transparent conductive material contained in the transparent conductive layer, thereby suppressing the difference in refractive index between the transparent conductive layer and the non-transparent layer. This also suppresses the difference in reflectance of light from an external light source, making the patterned transparent conductive layer less visible. (ii) The fine particles B of the metal oxide B absorb light in the ultraviolet region, ensuring yellowing resistance to UV irradiation during the exposure process when forming a transparent conductive layer by photolithography. (iii) Metal oxide B with this functionality can sometimes cause oxidative degradation of the IM layer as a side effect during exposure processing, but organometallic compounds can suppress this oxidative degradation. This prevents discoloration to yellow due to oxidation. In other words, the use of organometallic compounds can provide resistance to yellowing. (iv) Certain dispersants have chemically robust amide groups in their side chains. This prevents photodegradation of the dispersant during exposure processing, prevents discoloration to yellow of the IM layer, and inhibits alkali degradation during development, thereby preventing clouding of the IM layer. Furthermore, because the dispersant does not contain amine groups, which are typically used as adsorbents for metal oxides, the amide groups act as adsorbents for metal oxides A and B, ensuring their dispersibility while preventing the yellowing caused by amine groups.

[0032] Each component will be described below.

[0033] Metal oxide A is at least one metal oxide selected from zirconium oxide (ZrO2) and barium titanate (BaTiO3). As described above, metal oxide A has a refractive index greater than that of the conductive material, such as ITO, contained in the transparent conductive layer. Therefore, the reflectance of the layer containing metal oxide A is higher than that of the transparent conductive layer. When the dispersion is applied to the IM layer, the difference in reflectance due to the presence or absence of the transparent conductive layer is suppressed, making it possible to make the patterned electrode less visible.

[0034] The fine particles A of metal oxide A may have any form that can ensure transparency when dispersed in the IM layer. Such a form can be appropriately selected depending on the type of metal oxide A. From the viewpoints of transparency and dispersibility, the size of the fine particles A is preferably an average primary particle diameter of 10 to 80 nm, more preferably 10 to 50 nm. The content of metal oxide A in the dispersion is preferably 20 to 40 wt %.

[0035] The metal oxide B is a metal oxide having an absorption maximum wavelength of less than 390 nm. Because the metal oxide B absorbs light in the ultraviolet region, it can suppress yellowing of the IM layer due to UV irradiation during exposure when forming a transparent conductive layer by photolithography. Examples of such metal oxide B include titanium oxide (TiO2), zinc oxide (ZnO), and cerium oxide (CeO2). Among these, at least one selected from titanium oxide and zinc oxide is preferred from the viewpoint of absorbing light in a predetermined wavelength range. The titanium oxide may be either anatase or rutile. Titanium oxide and zinc oxide are preferably surface-treated to improve dispersibility and suppress photocatalytic activity, thereby suppressing oxidative degradation of the IM layer. Examples of such surface treatments include coatings of titanium oxide and zinc oxide nanoparticles with inorganic compounds such as (hydrous) alumina, silica (high-density silica, porous silica), and zirconia, or organic compounds such as fatty acids, silicones, polyols, and amines, or combinations thereof. Among these, those surface-treated with (hydrated) alumina and (hydrated) silica, and those surface-treated with silicone and silica are more preferred. Commercially available titanium oxides and zinc oxides can be used as such various titanium oxides and zinc oxides.

[0036] The fine particles B of metal oxide B may have any form that can ensure transparency when dispersed in the IM layer. Such a form can be appropriately selected depending on the type of metal oxide B. From the viewpoints of transparency and dispersibility, the size of the fine particles B is preferably an average primary particle diameter of 5 to 50 nm, more preferably 5 to 30 nm. The content of metal oxide B in the dispersion is preferably 1 to 5 parts by weight per 100 parts by weight of metal oxide A.

[0037] In this embodiment, in addition to the fine particles A and B of the metal oxides A and B described above, other fine particles C may be contained as necessary. Materials constituting such fine particles C may be any materials capable of forming transparent fine particles, and examples thereof include silica, alumina, silica-alumina composite metal oxides, polymers, etc. From the viewpoints of transparency and dispersibility, the size of the fine particles C is preferably an average primary particle diameter of 5 to 50 nm, more preferably 5 to 30 nm. The content of the metal oxide C in the dispersion is preferably 1 to 5 parts by weight per 100 parts by weight of the metal oxide A.

[0038] The primary particle diameters of the fine particles A to C of the metal oxides A to C can be measured, for example, from images of the pigment taken with a transmission electron microscope at a magnification of 100,000. The average primary particle diameter can be determined, for example, by measuring the primary particle diameters of 100 particles and averaging the measurements.

[0039] The organometallic compound is a compound that can further suppress the oxidative degradation of the IM layer caused by fine particles B of metal oxide B. In particular, when metal oxide B absorbs light in the ultraviolet region and has photocatalytic activity, by using it in combination with the above-mentioned fine particles B of metal oxide B, more preferably those that have been subjected to the above-mentioned surface treatment, it is possible to effectively suppress the photocatalytic activity and suppress the oxidative degradation of the IM layer, and ultimately yellowing, without impairing the function of metal oxide B.

[0040] The organometallic compound is not particularly limited as long as it can coat the surface of the metal oxide B fine particles B and suppress the photocatalytic activity of the metal oxide B. The organometallic compound is a compound in which a metal atom is bonded to an organic group. Examples of the metal atom include Ti, Zr, Al, and Si. Of these, from the viewpoint of suppressing yellowing, Zr and Al are preferred as the metal atom. Examples of organic compounds capable of forming an organic group include diketones, alkanolamines, glycols, hydroxycarboxylic acids, monohydric alcohols, and carboxylic acids without hydroxy groups. Of these, from the viewpoint of suppressing yellowing, diketones are preferred. Examples of diketones include β-ketones and β-ketoesters, and specific examples include acetylacetone, alkylacetoacetates, and compounds in which an aromatic ring or a heterocyclic ring is introduced as a substituent. Examples of alkanolamines include ethanolamine. The glycol may be a chain hydrocarbon or a cyclic hydrocarbon, and examples of the chain hydrocarbon include alkylene glycols such as ethylene glycol, and examples of the cyclic hydrocarbon include cyclohexanediol. Examples of the hydroxycarboxylic acid include lactic acid and citric acid. Examples of the monohydric alcohol include alkyl alcohols having 3 to 18 carbon atoms. Examples of the carboxylic acid without a hydroxy group include fatty acids having 3 to 18 carbon atoms. The organic group contained in the organometallic compound may be one type or two or more types derived from these organic compounds.

[0041] Among the above organometallic compounds, organoaluminum compounds and organozirconium compounds in which the metal is Al or Zr are preferred from the viewpoint of more effectively suppressing yellowing by coating the surface of the fine particles B of the metal oxide B. Such organometallic compounds preferably contain diketones as organic compounds capable of forming organic groups. Furthermore, it is more preferred that the metal is Al or Zr and that the organic compound capable of forming organic groups contains diketones. Such organometallic compounds can be commercially available.

[0042] The content of the organometallic compound in the dispersion is preferably 50 to 100 parts by weight per 100 parts by weight of the metal oxide B, from the viewpoint of suppressing yellowing of the IM layer.

[0043] The dispersant contains the aforementioned specific block copolymer A as an active ingredient. Such dispersants can be those described in JP 2019-2005 A. By using block copolymer A having such a specific structure as a dispersant, the first block located at one end of block copolymer A has affinity with metal oxides A and B and optional metal compound C based on the amide group, and the remaining portion extending linearly from the first block has affinity with the solvent and steric repulsion effects, allowing metal oxides A and B and optional metal compound C to be stably dispersed in the solvent, resulting in good dispersion stability. Block copolymer A does not contain basic groups such as amines, and therefore has yellowing resistance as described above.

[0044] The structural unit represented by formula (1) contains an amide bond in the side chain that is directly connected to the carbon atom that forms the main chain. 1a , R 1b and R 2 R may or may not contain an amide group. 1a , R 1b are each independently a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms, and at least one of them is not a hydrogen atom, from the viewpoint of affinity with the solvent, affinity with the metal oxides A and B, and the optional metal compound C (steric hindrance around the amide group). 1a , R 1b In the case of (ii), one of the R groups is a hydrogen atom and the other is the specified hydrocarbon group, or in the case of (ii), both of the R groups are the specified hydrocarbon groups. In the case of (ii), compared to the case of (i), even if moisture is mixed into the dispersion for some reason, the increase in viscosity of the dispersion tends to be more effectively suppressed. This viscosity suppression effect against moisture mixing is also the same in the case of the structural units represented by formula (2) and formula (2-2). In addition, R 2is a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms from the viewpoint of the polymerization reactivity of the monomer.

[0045] The monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms may be linear or branched. When the carbon atom number is 2 to 12, the carbon-carbon bond may contain at least one double bond. This tends to improve UV curability and hardness of the cured film. The number of double bonds and their location are not particularly limited. From the viewpoint of UV curability and dispersant synthesis, the number of double bonds may be preferably 1 to 3. From the viewpoint of UV curability, the location of the double bonds may be preferably at the terminal.

[0046] The monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms may or may not have a substituent. The presence or absence of a substituent can be determined taking into consideration the affinity with the metal oxide A, the affinity with the solvent, etc. Examples of such a substituent include -C(=O)-NR 5a R 5b , -OC(=O)-NR 6a R 6b , -NR 7 -C(=O)-NR 8a R 8b , a cyclic amide group, -OH, or -COOH. Examples of the cyclic amide group include an α-lactam group, a β-lactam group, a γ-lactam group, a δ-lactam group, and an ε-caprolactam group. R 5a ~R 8b are preferably each independently a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms. This tends to improve the viscosity stability of the dispersion over time. There are no particular limitations on the monovalent hydrocarbon group having 1 to 4 carbon atoms, and examples thereof include linear or branched saturated / unsaturated aliphatic hydrocarbon groups, and cyclic saturated / unsaturated aliphatic hydrocarbon groups. In addition, R 7 and R 8a or R 8b and may be linked to each other via a divalent hydrocarbon group having 1 to 4 carbon atoms to form a ring structure. 7 and R 8a or R 8bThe nitrogen atoms bonded to each of the amide groups may be linked via a divalent hydrocarbon group having 1 to 4 carbon atoms to form a ring structure. When the ring structure is present, steric hindrance around the amide group is reduced, and affinity with the metal oxides A and B and the optional metal compound C tends to be improved. Examples of the divalent hydrocarbon group having 1 to 4 carbon atoms that constitutes this ring structure include linear saturated hydrocarbon groups. Furthermore, it is preferred that the ends of the linear saturated hydrocarbon groups are linked together.

[0047] Among these monovalent aliphatic hydrocarbon groups having 2 to 12 carbon atoms and having a substituent, those overlapping with the case where -CH2- is replaced as described below are excluded.

[0048] When the monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms has 2 to 12 carbon atoms, the -CH2- constituting the group may be -O-, -C(=O)-, -C(=O)-O-, -OC(=O)-, or -C(=O)-NR 9 -, -NR 10 -C(=O)-, -NR 11 -C(=O)-O-, -OC(=O)-NR 12 -or-NR 13 -C(=O)-NR 14 When such a bond is present instead of -CH2-, the affinity with the metal oxides A and B and the optional metal compound C tends to be improved. The presence or absence, type, and number of such substitutions can be determined taking into consideration the affinity with the solvent, etc. 9 ~R 14 are preferably each independently a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms. This tends to improve the viscosity stability of the dispersion over time. There are no particular limitations on the monovalent hydrocarbon group having 1 to 4 carbon atoms, and examples thereof include linear or branched saturated / unsaturated aliphatic hydrocarbon groups, and cyclic saturated / unsaturated aliphatic hydrocarbon groups. In addition, R 13 and R 14 may be linked to each other via a divalent hydrocarbon group having 1 to 4 carbon atoms to form a ring structure. 13 and R 14may form a ring structure by linking the nitrogen atoms to which each of the amide groups is bonded via a divalent hydrocarbon group having 1 to 4 carbon atoms. When such a ring structure is present, steric hindrance around the amide group is reduced, and affinity with the metal oxides A and B and the optional metal compound C tends to be improved. Examples of this divalent hydrocarbon group having 1 to 4 carbon atoms include linear saturated hydrocarbon groups.

[0049] R 1a and R 1b In the above, aliphatic hydrocarbon groups having 1 to 4 carbon atoms may be linked together via -O- to form a ring structure. Examples of such aliphatic hydrocarbon groups include linear saturated hydrocarbon groups. Furthermore, it is preferable that the aliphatic hydrocarbon groups are linked at their terminals via an oxygen atom as a linking group.

[0050] In formula (1), R 1a , R 1b Specific examples of when is a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms are as follows, but are not limited to these specific examples.

[0051] Unsubstituted aliphatic hydrocarbons: methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, sec-butyl group, tert-butyl group, pentyl group (including its isomers), hexyl group (including its isomers), heptyl group (including its isomers), octyl group (including its isomers), nonyl group (including its isomers), decyl group (including its isomers), undecyl group (including its isomers), dodecyl group (including its isomers), etc. Aliphatic hydrocarbon groups having -OH as a substituent: -CH2CH2OH, -CH2CH(OH)-CH3, -CH(CH3)-CH2OH, -CH2CH2CH2OH, -CH2CH2CH2CH2OH, etc. Aliphatic hydrocarbon groups having -COOH as a substituent: -CH2CH2CH2CH2CH2COOH, -CH2CH(COOH)-CH3, etc. -C(=O)-NR as a substituent 5a R 5baliphatic hydrocarbon groups having the formula: -CH2CH2-C(=O)-NH-CH2CH3, -CH2CH2-C(=O)-N(CH2CH3)-CH2CH3, etc. Aliphatic hydrocarbon groups having a cyclic amide group as a substituent: groups represented by the following formula (3) and formula (4), groups in which the hydrogen atom bonded to the nitrogen atom in formula (4) has been substituted with an aliphatic hydrocarbon having 1 to 7 carbon atoms or an aromatic hydrocarbon having 6 to 7 carbon atoms, etc. In formulas (3) and (4), "*" represents a bond.

[0052] [ka]

[0053] [ka]

[0054] Examples of aliphatic hydrocarbon groups in which at least one of the -CH2- groups constituting the group is replaced with a specific bond include the following, although the group is not limited to these specific examples.

[0055] Examples containing -O-: -CH2-O-CH3, -CH2-O-CH2CH3, -CH2-O-CH2CH2CH3, -CH2-O-CH2CH2CH2CH3, -CH2-O-CH2CH(CH3)2, -CH2CH2-O-CH3, -CH2CH2-O-CH2CH 3, -CH2CH2-O-CH2CH2-O-CH3, -CH2CH2-O-CH2CH2-O-CH2CH3, -CH2CH2-O-CH2CH2-O-CH2CH2-O-CH3, -CH2CH2-O-CH2CH2-O-CH2CH2-O-CH2CH3, etc. Examples containing -C(=O)-: -C(CH3)2-CH2-C(=O)-CH3, etc. Examples containing -C(=O)-O-: -CH2-CH2-C(=O)-O-CH3, etc. Examples containing -OC(=O)-: -(CH2)6-OC(=O)-CH=CH2, -(CH2)9-OC(=O)-CH=CH2, groups represented by the following group of formula (5), etc. -C(=O)-NR 9 Examples of containing - include a group represented by the following formula (6), a group in which the hydrogen atoms bonded to each nitrogen atom in the following formula (6) are independently substituted with an aliphatic hydrocarbon or an aromatic hydrocarbon so that the total number of carbon atoms in formula (6) is 12 or less, and the like. -NR 10 Examples containing -C(=O)-: -CH2-NH-C(=O)-CH=CH2, -CH2CH2-NH-C(=O)-CH=CH2, a group represented by the following formula (7), a group in which the hydrogen atom bonded to each nitrogen atom in the following formula (7) is substituted with an aliphatic hydrocarbon having 1 to 7 carbon atoms or an aromatic hydrocarbon having 6 to 7 carbon atoms, etc. -NR 11 Examples containing -C(=O)-O-: groups represented by the following group of formula (8), etc. -OC(=O)-NR 12 Examples containing - include the following group of formula (9): -NR 13 -C(=O)-NR 14 Examples containing -: groups represented by the following formula (10): etc. In addition, "*" in formulas (5) to (10) represents a bond.

[0056] [ka]

[0057] [ka]

[0058] [ka]

[0059] [ka]

[0060] [ka]

[0061] [ka]

[0062] R is a ring structure formed by linking aliphatic hydrocarbon groups having 1 to 4 carbon atoms with each other via -O-. 1a and R 1b Examples of -NR in formula (1) are as follows. However, the present invention is not limited to these specific examples. Formula (10-2) is -NR in formula (1). 1a R 1b In formula (10-2), one end of two -CH2-CH2- is linked with an oxygen atom, and the other end is each bonded to a nitrogen atom to form a ring structure. Note that "*" in formula (10-2) represents a bond.

[0063] [ka]

[0064] Examples of the monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms include a phenyl group, a biphenyl group, a naphthalene group, an indane group, an indene group, and an azulene group. The aromatic hydrocarbon group may or may not have a substituent. The presence or absence of a substituent can be determined in consideration of the affinity with the metal oxides A and B and the optional metal compound C, the affinity with the solvent, and the like. Examples of such a substituent include -C(=O)-NR 6a R 6b , -OC(=O)-NR 6a R 6b , -NR 7 -C(=O)-NR 8a R 8b , a cyclic amide group, -OH, or -COOH. Examples of the cyclic amide group include an α-lactam group, a β-lactam group, a γ-lactam group, a δ-lactam group, and an ε-caprolactam group. R 5a ~R 8bare preferably each independently a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms. This tends to improve the viscosity stability of the dispersion over time. There are no particular limitations on the monovalent hydrocarbon group having 1 to 4 carbon atoms, and examples thereof include linear or branched saturated / unsaturated aliphatic hydrocarbon groups, and cyclic saturated / unsaturated aliphatic hydrocarbon groups. In addition, R 7 and R 8a or R 8b may be linked to each other via a divalent hydrocarbon group having 1 to 4 carbon atoms to form a ring structure. 7 and R 8a or R 8b may be linked to each other via a divalent hydrocarbon group having 1 to 4 carbon atoms to form a ring structure. When a ring structure is present, steric hindrance around the amide group is reduced, which tends to improve affinity with the metal oxides A and B and the optional metal compound C. Examples of the divalent hydrocarbon group having 1 to 4 carbon atoms that constitutes this ring structure include linear saturated hydrocarbon groups. The substituents of this aromatic hydrocarbon group are designated by the same symbols as those of the aliphatic hydrocarbon groups described above. 5a ~R 8b Although the above description uses the above equations, these can be determined independently.

[0065] In formula (1), R 1a , R 1b Specific examples of the aromatic hydrocarbon group having a substituent are as follows: Aromatic hydrocarbon groups having —OH as a substituent: groups represented by the following formula (11), etc. Aromatic hydrocarbon groups having —COOH as a substituent: groups represented by the following formula (12), etc. -C(=O)-NR as a substituent 5a R 5b Aromatic hydrocarbon groups having the formula (13): a group represented by the following formula (13), a group in which the hydrogen atom bonded to the nitrogen atom of the formula (13) is substituted with a methyl group, etc. -OC(=O)-NR as a substituent 6a R 6bAromatic hydrocarbon groups having the following formula (14): groups represented by the following formula (14), etc. -NR as a substituent 7 -C(=O)-NR 8a R 8b Aromatic hydrocarbon groups having the following formula (15): groups represented by the following formula (15), etc. In addition, "*" in formulas (11) to (15) represents a bond.

[0066] [ka]

[0067] [ka]

[0068] [ka]

[0069] [ka]

[0070] [ka]

[0071] As mentioned above, R 2 is a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms. These can be selected in consideration of the affinity with the solvent, the polymerization reactivity of the monomer, etc. The monovalent hydrocarbon group having 1 to 4 carbon atoms may be linear or branched. Examples of such hydrocarbon groups include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a sec-butyl group, and a tert-butyl group.

[0072] The structural unit represented by formula (2) has an amide group which may have an NH bond. 3is configured to have an amide group which may have an NH bond. From the viewpoint of affinity with the solvent, affinity with the metal oxides A and B and the optional metal compound C (steric hindrance around the amide group), R 3 is further preferably a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms. 3 Examples of R include, in the case of a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms, (i) a group in which a hydrogen atom directly bonded to the aliphatic hydrocarbon group is substituted with an amide group which may have an N-H bond, (ii) a group in which a -CH2- group in the aliphatic hydrocarbon group is replaced with an amide group which may have an N-H bond, and (iii) a group in which both the substitutions (i) and (ii) have been performed in the aliphatic hydrocarbon group. Furthermore, in the case of a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms, a group in which a hydrogen atom directly bonded to the aromatic hydrocarbon group is substituted with an amide group which may have an N-H bond can be exemplified. 4 is R 2 From the same viewpoint as above, it is a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms.

[0073] R 3 In the above formula, the monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms and the monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms are configured to contain one or more amide groups which may have an NH bond, but R 1a or R 1b The same applies to R in Equation (1). 5a ~R 8b are R in Eq. (2), respectively. 15a ~R 18b Similarly, R in equation (2) corresponds to 25a ~R 28b Also, R in equation (1) corresponds to 9 ~R 14 are R in Equation (2), respectively. 19 ~R 24 Therefore, R in Eq. (2) corresponds to 15a ~R 28b Regarding R 3is configured to contain one or more amide groups which may have an N-H bond, reference should be made to the explanation of the corresponding part of formula (1).

[0074] Also, R 4 is R in Eq. (1) 2 It is compatible with R 4 Regarding R in Eq. (1), 2 Please refer to the explanation in

[0075] The structural unit represented by formula (2-2) contains an amide bond in the side chain that is directly connected to the carbon atom that forms the main chain. 29 , R 30 and R 45 R may or may not contain an amide group. 29 , R 45 are each independently a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms, and at least one of them is not a hydrogen atom, from the viewpoint of affinity with the solvent, affinity with the metal oxides A and B, and the optional metal compound C (steric hindrance around the amide group). 29 , R 45 In the case of (ii), one of R is a hydrogen atom and the other is the specified hydrocarbon group, or in the case of (ii), both are the specified hydrocarbon groups. As mentioned above, in the case of (ii), there is a tendency to obtain a viscosity suppressing effect against water contamination of the dispersion. 30 is a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms from the viewpoint of the polymerization reactivity of the monomer.

[0076] R 29 , R 45 The monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms and the monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms in 1a or R 1b The same applies to R in Equation (1). 5a ~R 8b are R in formula (2-2), respectively. 31a ~R 34b Similarly, R in formula (2-2) corresponds to41a ~R 44b Also, R in equation (1) corresponds to 9 ~R 14 are the R in formula (2-2), respectively. 35 ~R 40 Therefore, R in equation (2-2) corresponds to 31a ~R 44b For the above, please refer to the explanation of the corresponding part of equation (1).

[0077] Also, R 30 is R in Eq. (1) 2 It is compatible with R 30 Regarding R in Eq. (1), 2 Please refer to the explanation in

[0078] The first block having at least one selected from the structural units represented by formulas (1), (2), and (2-2) can be obtained, for example, by homopolymerizing or copolymerizing a monomer capable of forming each structural unit. Furthermore, the monomer capable of forming each structural unit may be copolymerized with another monomer copolymerizable therewith, as long as the effect of the first block is not affected. That is, the first block may be a homopolymer of the structural unit represented by formula (1), a homopolymer of the structural unit represented by formula (2), a homopolymer of the structural unit represented by formula (2-2), a random or block copolymer of the structural units represented by formulas (1) and (2), or formulas (1) and (2-2), or formulas (2) and (2-2), or a copolymer of these polymers with other monomers. Of these, the first block is preferably a homopolymer of a constitutional unit represented by formula (1), a homopolymer of a constitutional unit represented by formula (2), or a random or block copolymer of constitutional units represented by formulas (1) and (2), and more preferably a homopolymer of a constitutional unit represented by formula (1) or a homopolymer of a constitutional unit represented by formula (2).

[0079] Embodiments of the first block having at least one type selected from the structural units represented by formulas (1), (2), and (2-2) can be broadly classified into (A) a first block containing an amide group having an N-H bond in the side chain, and (B) a first block containing an amide group without an N-H bond. The solvent used to prepare the dispersion is generally an organic solvent, but even if moisture is mixed in for some reason, the viscosity of the dispersion is prevented from increasing. Furthermore, even when mixed with a coating film-forming component to prepare a curable composition, the storage stability is good.

[0080] The first block containing an amide group having an N-H bond is, for example, composed of at least one of the following structural units: Other structural units polymerizable with these may also be included to the extent that they do not affect the function of the first block, but of course, they are limited to those that do not contain basic groups such as amines. (i) Among the structural units represented by formula (1), R 1a and R 1b one of which is a hydrogen atom, and the other is a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms and containing an amide group which may have an N-H bond, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms and containing an amide group which may have an N-H bond; (ii) Among the structural units represented by formula (2), R 3 is a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms and containing an amide group having an N-H bond, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms and containing an amide group having an N-H bond; (iii) Among the structural units represented by formula (2-2), R in formula (2-2) 45 is a hydrogen atom, and R 29 is a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms which may contain an amide group which may have an N-H bond, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms which may contain an amide group which may have an N-H bond; (iv) Among the structural units represented by formula (2-2), R in formula (2-2) 29 , R 45At least one of the above is a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms and containing an amide group having an N-H bond, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms and containing an amide group having an N-H bond.

[0081] The first block containing an amide group without an N-H bond is, for example, composed of at least one of the following structural units: Other structural units polymerizable with these may also be included to the extent that they do not affect the function of the first block, but of course they are limited to those that do not contain a basic group such as an amine. (i) Among the structural units represented by formula (1), R 1a and R 1b is a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms which may contain an amide group having no N-H bond, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms which may contain an amide group having no N-H bond; (ii) Among the structural units represented by formula (2), R 3 is a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms and containing an amide group having no N-H bond, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms and containing an amide group having no N-H bond; (iii) Among the structural units represented by formula (2-2), R in formula (2-2) 29 , R 45 is a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms which may contain an amide group having no N-H bond, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms which may contain an amide group having no N-H bond.

[0082] Examples of monomers capable of forming the structural units represented by formulas (1), (2), and (2-2) include monomers having a polymerizable double bond that has an amide bond that may have an NH bond and has no basic group. Examples of such monomers include acrylamide monomers, methacrylamide monomers, acrylic acid ester monomers having an amide bond, methacrylic acid ester monomers having an amide bond, and N-vinylcarboxylic acid amide. Hereinafter, unless otherwise specified, "(meth)acrylic" will be used to refer to "acrylic" and / or "methacrylic."

[0083] Examples of (meth)acrylamide-based monomers include (meth)acrylamide, N-alkyl(meth)acrylamide, N,N-alkyl(meth)acrylamide, N-alkylalkoxyalkyl(meth)acrylamide, N,N-alkylalkoxyalkyl(meth)acrylamide, N-hydroxyalkyl(meth)acrylamide, N,N-hydroxyalkyl(meth)acrylamide, N-carboxyalkyl(meth)acrylamide, N,N-carboxyalkyl(meth)acrylamide, and 4-acryloylmorpholine. More specific examples include N-methyl(meth)acrylamide, N,N-dimethyl(meth)acrylamide, N-ethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropyl(meth)acrylamide, N,N-diisopropyl(meth)acrylamide, N-isobutoxymethyl(meth)acrylamide, N,N-diisobutoxymethyl(meth)acrylamide, N-hydroxymethyl(meth)acrylamide, N,N-dihydroxymethyl(meth)acrylamide, N-hydroxyethyl(meth)acrylamide, N,N-dihydroxyethyl(meth)acrylamide, N-hydroxypropyl(meth)acrylamide, N,N-dihydroxypropyl(meth)acrylamide, N-methyl(meth)acrylamide, N,N Examples of such compounds include dimethyl(meth)acrylamide, N-ethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-propyl(meth)acrylamide, N,N-dipropyl(meth)acrylamide, Nn-butylacryl(meth)acrylamide, N,N-di(n-butylacryl)(meth)acrylamide, Nt-butyl(meth)acrylamide, N,N-di(t-butyl)(meth)acrylamide, N-cyclohexyl(meth)acrylamide, N,N-dicyclohexyl(meth)acrylamide, N-(2-methoxyethyl)(meth)acrylamide, N,N-di(2-methoxyethyl)(meth)acrylamide, N-phenyl(meth)acrylamide, N,N-diphenyl(meth)acrylamide, and diacetone(meth)acrylamide.

[0084] Examples of (meth)acrylic acid ester monomers include 2-(methacryloyloxyacetamidoethylene)-N,N'-ethyleneurea (MEU), an addition reaction product of hydroxyethyl methacrylate (HEMA) and 2-isocyanatoethyl methacrylate (MOI) (HEMA-MOI) (see formula (16) below), and N-ethylcarbamic acid methyl acrylate.

[0085] [ka]

[0086] As the N-vinylcarboxylic acid amide, for example, a compound represented by the general formula: 30 =CH-NR 45 -CO-R 29 Examples of the N-vinyl-N-alkylacetamide include N-vinyl-N-methylacetamide.

[0087] Other monomers copolymerizable with the monomers capable of forming the structural units represented by formulas (1), (2), and (2-2) include, for example, the nonionic water-insoluble compounds having no basic group described below, among which vinyl-based monomers are preferred, such as alkyl (meth)acrylates, styrene-based monomers, etc. These copolymerizable compounds can be used alone or in combination of two or more.

[0088] The content of the structural units (first blocks) represented by formula (1) and / or (2) and / or (2-2) in block copolymer A is not particularly limited, but from the viewpoint of dispersion stability, it is preferably 10 to 50 wt %, more preferably 25 to 40 wt %, based on the total amount of block copolymer A. Furthermore, when two or more structural units represented by formula (1), (2), and formula (2-2) are contained, the weight ratio is not particularly limited. For example, when both structural units represented by formula (1) and (2) are contained, the weight ratio of the two (formula (1) / formula (2)) can be determined depending on the affinity with metal oxides A and B and the optional metal compound C, but from the viewpoint of dispersion stability, it is preferably 100 / 0 to 50 / 50.

[0089] In an embodiment of the present invention, the block copolymer A constituting the dispersant may have a second block. One end of the second block is bonded to one end of the first block, forming a linear structure. The structural units constituting the second block can be selected taking into consideration affinity with the solvent, dispersion stability, steric repulsion, and the like. Such structural units are preferably at least one selected from structural units derived from nonionic water-soluble compounds and structural units derived from nonionic water-insoluble compounds. Furthermore, from the viewpoint of alkaline developer resistance, it is acceptable to include a structural unit having an acidic group (derived from anionic water-soluble compounds, etc.) within a range that does not affect the formation of the patterned transparent conductive layer, but it is preferable not to include such a structural unit. When the second block contains two or more structural units, it may be a random copolymer or a block copolymer, but from the viewpoint of dispersion stability, it is preferably a block copolymer.

[0090] The nonionic water-soluble unit is a divalent structural unit derived from a nonionic water-soluble compound. The nonionic water-soluble compound is not particularly limited as long as it is a nonionic, water-soluble, and polymerizable organic compound, but a nonionic water-soluble organic compound having a hydroxyl group and being polymerizable is preferred. The nonionic water-soluble organic compound may have a polymerizable group, and the polymerizable group is preferably a group having a polymerizable double bond, more preferably an alkenyl group, and even more preferably a vinyl group.

[0091] Examples of the polymerizable nonionic water-soluble organic compound having a hydroxyl group include polyalkylene glycol, polyalkylene glycol (meth)acrylate, hydroxyalkyl (meth)acrylate, alkylene oxide, etc. These can be used alone or in combination of two or more.

[0092] Examples of polyalkylene glycols include polyalkylene glycols having an alkylene chain with 2 to 4 carbon atoms, such as polyethylene glycol, polypropylene glycol, and polybutylene glycol.

[0093] Examples of polyalkylene glycol (meth)acrylates include monofunctional or polyfunctional esters of polyalkylene glycols having an alkylene chain with 2 to 4 carbon atoms and acrylic acid or methacrylic acid, and more specific examples include polyethylene glycol monomethacrylate, methoxypolyethylene glycol monomethacrylate, polyethylene glycol dimethacrylate, phenoxypolyethylene glycol acrylate, polypropylene glycol monomethacrylate, and polypropylene glycol diacrylate.

[0094] Examples of hydroxyalkyl (meth)acrylates include hydroxyalkyl (meth)acrylates in which the alkyl moiety is a chain alkyl having 1 to 4 carbon atoms, such as 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate.

[0095] Examples of alkylene oxides include ethylene oxide, propylene oxide, and butylene oxide.

[0096] The content of the nonionic water-soluble unit in the block copolymer A is preferably 0 to 40% by weight, more preferably 0 to 30% by weight, based on the total amount of the block copolymer A, from the viewpoints of affinity with the solvent, dispersion stability, etc.

[0097] The nonionic water-insoluble unit is a divalent structural unit derived from a nonionic water-insoluble compound. The nonionic water-insoluble unit is used, for example, to adjust the degree of hydrophilicity of the second block. Furthermore, when the nonionic water-insoluble unit has a higher hydrophilicity, it serves to enhance the hydrophilicity of the second block. The nonionic water-insoluble compound is not particularly limited as long as it is an organic compound that is nonionic and water-insoluble and has a polymerizable group. However, a nonionic water-insoluble organic compound having at least one hydrophobic group (hereinafter sometimes simply referred to as "hydrophobic group") selected from the group consisting of a chain hydrocarbon group, a cyclic hydrocarbon group, and an aromatic hydrocarbon group, and a polymerizable group in one molecule is preferred. The polymerizable group is preferably a group having a polymerizable double bond, more preferably an alkenyl group, and even more preferably a vinyl group.

[0098] Examples of nonionic water-insoluble organic compounds having a hydrophobic group and a polymerizable group in one molecule include chain alkyl (meth)acrylates, cycloalkyl (meth)acrylates, aryl (meth)acrylates, styrene-based compounds, etc. These can be used alone or in combination of two or more.

[0099] Examples of the chain alkyl (meth)acrylate include alkyl (meth)acrylates in which the alkyl moiety has 1 to 17 carbon atoms, such as methyl (meth)acrylate, ethyl (meth)acrylate, isopropyl (meth)acrylate, n-propyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and glycidyl (meth)acrylate.

[0100] Examples of cycloalkyl(meth)acrylates include cycloalkyl(meth)acrylates in which the cycloalkyl moiety has 3 to 10 carbon atoms, such as cyclopropyl(meth)acrylate, cyclobutyl(meth)acrylate, cyclopentyl(meth)acrylate, cyclohexyl(meth)acrylate, cycloheptyl(meth)acrylate, cyclooctyl(meth)acrylate, cyclononyl(meth)acrylate, and cyclodecyl(meth)acrylate. Examples of aryl (meth)acrylates include benzyl (meth)acrylate and phenoxyethyl (meth)acrylate.

[0101] Examples of styrene compounds include styrene compounds having at least one substituent selected from the group consisting of a chain alkyl group having 1 to 4 carbon atoms, a chain alkoxy group having 1 to 4 carbon atoms, and a halogen atom, such as styrene, α-methylstyrene, methylstyrene, 3-methylstyrene, 4-methylstyrene, 3-ethylstyrene, 4-ethylstyrene, methoxystyrene, chloromethylstyrene, chlorostyrene, 4-tert-butylstyrene, and vinyltoluene.

[0102] The content of the nonionic water-insoluble unit in the block copolymer A is preferably 30 to 80% by weight, more preferably 50 to 70% by weight, based on the total amount of the block copolymer A, from the viewpoints of affinity with the solvent, dispersion stability, etc.

[0103] The block copolymer A preferably has a first block of 10 to 50% by weight and a second block of 50 to 90% by weight, with the total of the first and second blocks being 100% by weight. The second block preferably has a weight ratio (A / B) of units (A) derived from a nonionic water-soluble compound to units (B) derived from a nonionic water-insoluble compound of 0 to 70 / 30 to 100, with the total of A and B being 100% by weight.

[0104] The block copolymer A can be synthesized by using a known polymerization method such as living (controlled) radical polymerization. Living radical polymerization methods can be broadly classified into ATRP (atom transfer radical polymerization), RAFT (reversible addition-fragmentation chain transfer polymerization), NMP (nitroxide-mediated radical polymerization), TERP (organotellurium-mediated radical polymerization), and RTCP (reversible transfer catalyzed polymerization), and may be synthesized by appropriately selecting one of these methods.

[0105] From the viewpoint of dispersion stability, the molecular weight of block copolymer A has a peak top molecular weight of preferably 4,000 to 40,000, more preferably 5,000 to 20,000. The molecular weight of block copolymer A can be adjusted by appropriately selecting the type and content of each structural unit, the timing of terminating the polymerization reaction, etc. Furthermore, from the viewpoint of dispersion stability, the ratio of weight average molecular weight Mw to number average molecular weight Mn (Mw / Mn) is preferably 1.05 to 1.7, more preferably 1.05 to 1.5.

[0106] The acid value and amine value of block copolymer A are determined by the functional groups contained in block copolymer A and the contents thereof. The acid value (acid value converted into solid content) can be determined, for example, by a method conforming to DIN EN ISO 2114, and the amine value (amine value converted into solid content) can be determined, for example, by a method conforming to DIN 16945. From the viewpoint of alkaline developer resistance, the acid value of block copolymer A is preferably 1 mgKOH / g or less. From the viewpoint of yellowing resistance, the amine value of block copolymer A is preferably 1 mgKOH / g or less.

[0107] From the viewpoint of dispersion stability, the content of the dispersant in the dispersion (solid content or active ingredient) is preferably 10 to 30 parts by weight, and more preferably 10 to 20 parts by weight, per 100 parts by weight of the total of metal oxides A, B, and optional metal compound C. However, the optimal amount of dispersant to be added may be adjusted as appropriate depending on the combination of metal oxides A, B, and optional metal compound C used.

[0108] The solvent can be appropriately selected depending on the type of coating film-forming component described below, and examples thereof include various organic solvents such as aromatic, ketone, ester, glycol ether, alcohol, aliphatic, and amide organic solvents. Of these, from the viewpoint of coating film formability, organic solvents selected from aromatic, ketone, ester, and glycol ether organic solvents are preferred. The organic solvent may be used alone or in combination of two or more.

[0109] Examples of aromatic organic solvents include aromatic hydrocarbons such as toluene, xylene, and ethylbenzene.

[0110] Examples of ketone organic solvents include methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), diisobutyl ketone, acetylacetone, isophorone, acetophenone, and cyclohexanone.

[0111] Examples of ester-based organic solvents include ethyl acetate, n-butyl acetate, isobutyl acetate, isopropyl acetate, methyl propionate, 3-methoxybutyl acetate, ethyl glycol acetate, propylene glycol monomethyl ether acetate (PMA), propylene glycol monoethyl ether acetate, 3-methyl-3-methoxybutyl acetate, methyl monochloroacetate, ethyl monochloroacetate, butyl monochloroacetate, methyl acetoacetate, ethyl acetoacetate, butyl carbitol acetate, butyl lactate, ethyl 3-ethoxypropionate, ethylene glycol monobutyl ether acetate, ethylene glycol monomethyl ether acetate, propyl acetate, and 1,3-butylene glycol diacetate.

[0112] Examples of glycol ether organic solvents include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol mono-n-propyl ether, ethylene glycol mono-iso-propyl ether, diethylene glycol mono-iso-propyl ether, ethylene glycol mono-n-butyl ether, diethylene glycol mono-n-butyl ether, triethylene glycol mono-n-butyl ether, ethylene glycol mono-t-butyl ether, diethylene glycol mono-t-butyl ether, 1-methyl-1-methoxybutanol, propylene glycol monomethyl ether (PM), propylene glycol monoethyl ether, propylene glycol mono-t-butyl ether, propylene glycol mono-n- Examples of the glycol ether include water-soluble glycol ethers such as propyl ether, propylene glycol mono-iso-propyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol mono-n-propyl ether, dipropylene glycol mono-iso-propyl ether, propylene glycol mono-n-butyl ether, and dipropylene glycol mono-n-butyl ether; and water-insoluble glycol ethers such as ethylene glycol monohexyl ether, ethylene glycol-2-ethylhexyl ether, ethylene glycol phenyl ether, diethylene glycol-n-hexyl ether, diethylene glycol-2-ethylhexyl ether, propylene glycol monobutyl ether, dipropylene glycol monobutyl ether, dipropylene glycol propyl ether, and propylene glycol methyl ether propionate.

[0113] Examples of alcohol-based organic solvents include alkyl alcohols having 1 to 4 carbon atoms, such as ethanol, methanol, butanol, propanol, and isopropanol; Examples of the suitable glycol include ethylene glycol, propylene glycol, diethylene glycol, pentamethylene glycol, trimethylene glycol, 2-butene-1,4-diol, 2-ethyl-1,3-hexanediol, 2-methyl-2,4-pentanediol, tripropylene glycol, polyethylene glycols with a molecular weight of 2000 or less, 1,3-propylene glycol, isopropylene glycol, isobutylene glycol, 1,4-butanediol, 1,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, glycerin, mesoerythritol, and pentaerythritol.

[0114] Examples of the aliphatic organic solvent include aliphatic hydrocarbons such as n-pentane, n-hexane, and n-heptane.

[0115] Examples of amide organic solvents include dimethylformamide, N,N-dimethylacetamide, and N-methylpyrrolidone.

[0116] When used in the preparation of the curable composition described below, the solvent can be added so that the solid content is 20 to 40% by weight from the viewpoint of ease of handling.

[0117] The dispersion can be obtained, for example, by adding the aforementioned components to a known dispersing machine such as a bead mill, sand mill, or disperser and dispersing the components. There are no particular limitations on the method of adding the components, and the components may be mixed simultaneously and then dispersed. However, it is preferable to mix the metal oxide B microparticles B and the organometallic compound in advance and coat the surfaces of the microparticles B with the organometallic compound. When the dispersion treatment is carried out using a dispersion medium such as zirconia beads, the bead diameter may be gradually reduced and the treatment may be repeated multiple times. The conditions, such as the bead diameter, temperature, and time, can be determined as appropriate.

[0118] The curable composition according to the embodiment contains the dispersion and the coating film-forming component. Because the dispersion is included, the dispersibility is good even when the coating film-forming component is added, and the IM layer obtained by curing can be imparted with good yellowing resistance and alkali resistance, and the transparent conductive layer can be made less visible.

[0119] Examples of the film-forming component include polymerizable components, polymers, and mixtures thereof.

[0120] Examples of the polymer include thermoplastic urethane resins, (meth)acrylic resins, polyamide resins, polyimide resins, styrene-maleic acid resins, polyester resins, silicone resins, and cardo resins.

[0121] Examples of the polymerizable component include compounds having a polymerizable group, such as (meth)acrylic acid esters, styrenes, and polyene monomers. The compound having a polymerizable group may be combined with a compound having a functional group capable of crosslinking with the compound (hereinafter referred to as a "curing agent"). The polymerizable component includes such a curing agent.

[0122] Examples of (meth)acrylic acid esters include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, n-hexyl (meth)acrylate, cyclohexyl (meth)acrylate, t-butylcyclohexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, t-octyl (meth)acrylate, dodecyl (meth)acrylate, octadecyl (meth)acrylate, acetoxyethyl (meth)acrylate, phenyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, 2-(2-methoxyethoxy)ethyl (meth)acrylate, 3-phenoxy-2-hydroxypropyl (meth)acrylate, and benzyl (meth)acrylate. , diethylene glycol monomethyl ether (meth)acrylate, diethylene glycol monoethyl ether (meth)acrylate, triethylene glycol monomethyl ether (meth)acrylate, triethylene glycol monoethyl ether (meth)acrylate, polyethylene glycol monomethyl ether (meth)acrylate, polyethylene glycol monoethyl ether (meth)acrylate, β-phenoxyethoxyethyl (meth)acrylate, nonylphenoxy polyethylene glycol (meth)acrylate, dicyclopentenyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, trifluoroethyl (meth)acrylate, octafluoropentyl (meth)acrylate, perfluorooctylethyl (meth)acrylate, dicyclopentanyl (meth)acrylate, tribromophenyl (meth)acrylate, and tribromophenyloxyethyl (meth)acrylate.

[0123] Examples of styrenes include styrene, methylstyrene, dimethylstyrene, trimethylstyrene, ethylstyrene, isopropylstyrene, butylstyrene, hydroxystyrene, methoxystyrene, butoxystyrene, acetoxystyrene, chlorostyrene, dichlorostyrene, bromostyrene, chloromethylstyrene, hydroxystyrene protected with a group that can be deprotected with an acidic substance (e.g., t-Boc), methyl vinylbenzoate, and α-methylstyrene.

[0124] Polyene monomers are compounds containing more than one C=C bond, preferably two or more, and more preferably two to four C=C bonds.

[0125] The polyene monomers preferably contain at least one selected from an acrylate group, a methacrylate group, a vinyl group, and an allyl group, more preferably an allyl group, and preferably contain two or more, more preferably two to four, of these groups.

[0126] Examples of polyene monomers containing a vinyl group include divinylbenzene.

[0127] Examples of polyene monomers containing an allyl group include diallyl phthalate, diallyl isophthalate, diallyl cyanurate, diallyl isocyanurate, pentaerythritol diallyl ether, trimethylolpropane diallyl ether, glycerin diallyl ether, bisphenol A diallyl ether, bisphenol F diallyl ether, ethylene glycol diallyl ether, diethylene glycol diallyl ether, triethylene glycol diallyl ether, propylene glycol diallyl ether, dipropylene glycol diallyl ether, tripropylene glycol diallyl ether, triallyl isocyanurate (1,3,5-triallyl-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, TAIC), 2,4,6-triallyloxy-1,3,5-triazine, trimethylpropane triallyl ether, pentaerythritol triallyl ether, diallyl carbonate, and di(ethylene glycol)bis(allyl carbonate).

[0128] Examples of polyene monomers containing an acrylate group or a methacrylate group include 1,4-butanediol diacrylate (BDDA), 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate (HDMA), ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, polyethylene glycol diacrylate, dipropylene glycol diacrylate (DPGDA), tripropylene glycol diacrylate, ethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, dipropylene glycol dimethacrylate, neopentyl glycol diacrylate, propoxylated neopentyl glycol diacrylate, glycerol diacrylate, ethoxylated glycerol diacrylate, propoxylated glycerol diacrylate, 1,1,1-trimethylolpropane triacrylate (TMPTA), 1, 1,1-trimethylolpropane trimethacrylate (TMPTMA), ethoxylated 1,1,1-trimethylolpropane triacrylate, propoxylated 1,1,1-trimethylolpropane triacrylate, ethoxylated pentaerythritol triacrylate, propoxylated pentaerythritol triacrylate, pentaerythritol triacrylate (PETA), pentaerythritol trimethacrylate, 1,3,5-triacryloylhexahydro-1,3,5-triazine, tris[2 -(acryloyloxy)ethyl] isocyanurate, 1,3,5-triacryloylhexahydro-1,3,5-triazine, bisphenol A diacrylate, ethoxylated bisphenol A diacrylate, bisphenol A dimethacrylate, dipentaerythritol hexaacrylate (DPHA), ethoxylated bisphenol A dimethacrylate bisacrylate derivatives of bisphenol S, dimethacrylate derivatives of bisphenol S, and diacrylate derivatives of bisphenol S.

[0129] Examples of the curing agent include polyfunctional thiols.

[0130] Examples of polyfunctional thiols include methanedithiol; 1,2-ethanedithiol; 1,1-propanedithiol; 1,2-propanedithiol; 2,2-propanedithiol; 1,3-propanedithiol; 1,4-butanedithiol; 1,2-butanedithiol; 1,5-pentanedithiol; 1,6-hexanedithiol; 1,8-octanedithiol; 2,2'-oxydiethanethiol; 2,2'-thiodiethanethiol; 2,2'-(ethylenedioxy)diethanethiol; hexa(ethylene glycol)dithiol; 3,6-di Oxa-1,8-octanedithiol;Glycol dimercaptoacetate;Diethylene glycol bis(2-mercaptoacetate);dl-1,4-Dithiothreitol;Bis(2-mercaptoethyl) sulfide (B2MS);Bis(2-mercaptoethyl) sulfone;2,5-Dimercapto-1,3,4-thiadiazole;5-({2-[(5-mercapto-1,3,4-thiadiazol-2-yl)thio]ethyl}thio)-1,3,4-thiadiazole-2-thiol;Pentaerythritol tetra(2-mercaptoacetate); Trimethylolethane tris(3-mercaptopropionate);Trimethylolpropane tris(3-mercaptopropionate);Trimethylolpropane tris(2-mercaptoacetate);1,4-Benzenedithiol;1,3-Benzenedithiol;1,3,5-Benzenetrithiol;3,4-Dimercaptotoluene;1,4-Benzenedimethanethiol;1,3-Benzenedimethanethiol;1,6-Di(methanethiol)-3,4-dimethyl-phenyl;[3-(mercaptomethyl)-2,4,6-trimethylphenyl]methyl Tanthiol;1,5-Dimercaptonaphthalene;5,7-Dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane;4,7-Dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane;4,8-Dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane;5-[3-(5-mercapto-1,3,4-oxadiazol-2-yl)propyl]-1,3,4-oxadiazole-2-thiol;2,3-Bis[(2-mercaptoethyl)thio]-1-propanethiol;Pentaerythritol tetrakis(2-mercaptoacetate);Pentaerythritol tetrakis(3-mercaptopropionate);1-(1'-Mercaptoethylthio)-2,3-dimercaptopropane;1-(2'-Mercaptopropylthio)-2,3-dimercaptopropane;1-(3'-Mercaptopropylthio)-2,3-dimercaptopropane;1-(4'-Mercaptopropylthio)-2,3-dimercaptopropane;1-(5'-Mercaptopentylthio)-2,3-dimercapto 1,2,3-Tris(mercaptoethylthio)propane;1,2,3-Tris(3'-mercaptopropylthio)propane;1,2,3-Tris(2'-mercaptoethylthio)propane;1,2,3-Tris(3'-mercaptopropylthio)propane;1,2,3-Tris(2'-mercaptoethylthio)propane Propane;1,2,3-Tris(4'-mercaptobutylthio)propane;1,2,3-Tris(6'-mercaptohexylthio)propane;1,6-Hexanethiol-1,2,3-propanetrithiol;1,2-Bis(2'-mercaptoethylthio)-3-mercaptopropane;1,2,3-Trimethylolpropane tri(thioglycolate);Pentaerythritol tetra(thioglycolate);1,2,3-Trimethylolpropane tri(3-mercaptopropionate);Dithioglycerol trithioglycerol; dipentaerythritol hexa(2-mercaptoacetate); 3,4,5,6-tetrachloro-1,2-dimercaptobenzene, pentaerythritol tetrakis(3-mercaptobutyrate), 1,3,5-tris(2-(3-sulfanylbutanoyloxy)ethyl)-1,3,5-triazinane-2,4,6-trione, trimethylolpropane tris(3-mercaptobutyrate), 1,4-bis(3-mercaptobutyryloxy)butane, etc.;

[0131] The polyfunctional thiol preferably contains a secondary thiol, more preferably has an isocyanurate ring. When a polyfunctional thiol is used, a reaction occurs at the thiol group to form a sulfide bond, thereby providing oxidation prevention and thus yellowing resistance.

[0132] From the viewpoints of adhesion of the IM layer to the transparent substrate, alkali resistance, and yellowing resistance, it is preferable to use a combination of polyene monomers and a curing agent that can crosslink with the polyene monomers as the polymerizable component; it is more preferable to use polyene monomers containing an allyl group as the polyene monomer and a polyfunctional thiol as the curing agent; it is even more preferable to use polyene monomers having an allyl group as the polyene monomer and a polyfunctional thiol containing a secondary thiol as the curing agent; and it is particularly preferable to use polyene monomers having an allyl group and an isocyanurate ring structure as the polyene monomer and a secondary thiol and an isocyanurate ring structure as the curing agent.

[0133] The content (solid content or non-volatile content) of the coating film-forming component in the curable composition is preferably 70 to 90 parts by weight per 100 parts by weight of the fine particles A of metal oxide A. When polyene monomers and polyfunctional thiol are used as the polymerizable components, the molar ratio obtained by dividing the C=C bonds in the polyene monomer by the sum of the C=C bonds in the polyene monomer and the thiol groups in the polythiol monomer is preferably 50% to 98%, more preferably 60 to 96%.

[0134] To promote the polymerization of the polymerizable components, it is preferable to use a polymerization initiator. Known polymerization initiators can be used. Examples include acetophenone-based, ketal-based, benzophenone-based, benzoin-based, benzoyl-based, xanthone-based, active halogen compounds (triazine-based, oxadiazole-based, coumarin-based), acridine-based, biimidazole-based, and oxime ester-based photopolymerization initiators. Specific examples of these photopolymerization initiators include those described in JP-A-2009-179789. The content of the polymerization initiator in the curable composition is preferably 2 to 10 parts by weight per 100 parts by weight of the polymerizable components.

[0135] A solvent may be further added to the curable composition as needed. Such a solvent may be the same as that used in the dispersion described above. In this case, the solvent may be the same as or different from the solvent contained in the dispersion. The solvent may be one type or a combination of two or more types. The content of the solvent in the curable composition, including that contained in the dispersion, is preferably added so that the non-volatile components in the curable composition are 10 to 50 wt %.

[0136] In addition to the above-described components, the curable composition may contain other components as needed, such as a sensitizer, a leveling agent, an antioxidant, etc.

[0137] The curable composition can be obtained by mixing the dispersion, the coating film-forming component, the solvent added as needed, and other optional components, followed by stirring. The method and order of adding each component are not particularly limited. When adding a solvent, the solvent may be added stepwise so that the concentration of nonvolatile components in the curable composition gradually decreases. The stirring method is not particularly limited, and can be performed using, for example, a disperser or a shaker. The stirring temperature and time can be appropriately determined depending on the component composition.

[0138] The cured film obtained by forming a film using the above-described curable composition according to a standard method has a higher refractive index than a transparent conductive layer containing a conductive material such as ITO, and is resistant to yellowing and alkali. Furthermore, by using a specific polymerizable component as a coating film-forming component, the cured film has even better adhesion to the substrate. Therefore, the cured film is suitable as an IM layer for a touch panel. In other words, the above-described curable composition is suitable for forming an IM layer. It can also be used for forming an anti-reflection layer for a coating film applied to the screen surface of a display device. [Example]

[0139] Hereinafter, the embodiments of the present invention will be described in detail based on examples.

[0140] (Production Example 1) Production of Dispersant I 212.3 parts by weight of methyl methacrylate (MMA), 15 parts by weight of N-(tert-butyl)-N-(1-diethylphosphono-2,2-dimethylpropyl)-O-(2-carboxylprop-2-yl)hydroxyamine (manufactured by Arkema, product name BlocBuilder MA), 90 parts by weight of propylene glycol monomethyl ether acetate (PMA), and 45 parts by weight of propylene glycol monomethyl ether (PM) were charged into a 2-L stainless steel separable flask, and the system was heated to 125°C in an oil bath while bubbling with nitrogen and stirring, and then the reaction was carried out for 4 hours after the temperature increase was complete.

[0141] Next, 206.0 parts by weight of butyl methacrylate (BMA), 80 parts by weight of PMA, and 40 parts by weight of PM were charged into the flask, and the mixture was reacted at 125° C. for 4 hours while continuing to bubbling with nitrogen and stirring.

[0142] Next, 211.7 parts by weight of N,N-dimethylacrylamide (DMAA), 80 parts by weight of PMA, and 40 parts by weight of PM were added to the flask, and the mixture was reacted at 125° C. for 4 hours while continuing to bubbling with nitrogen and stirring.

[0143] The temperature in the system was then raised to 210°C, the pressure in the system was reduced to 2.0 kPa, and the solvent was distilled off to obtain block copolymer I. The solid content of the reaction mixture was 40% by weight. GPC measurement of the obtained block copolymer I revealed a peak top molecular weight of 9,500 and an Mw / Mn ratio of 1.19. The acid value and amine value were 0 mgKOH / g.

[0144] The block copolymer I thus obtained had a linear second block in which a block I-1 having a structural unit derived from MMA and a block I-2 having a structural unit derived from BMA were linked at one end of each block, and a structural unit derived from DMAA (R in formula (1)) was linked to the other end of block I-2. 1a and R 1b is -CH3, R 2is a hydrogen atom. ) and a first block having a block I-3 having the same. That is, block copolymer I is a linear block copolymer having the first block at one end. Due to the monomer structure, block copolymer I does not have a basic group. The weight ratio of each block in block copolymer I (block I-1 / block I-2 / block I-3) is 33.7 / 32.7 / 33.6. Block copolymer I was used as dispersant I.

[0145] (Production Example 2) Production of Dispersant II Block copolymer II was obtained in the same manner as in Production Example 1, except that acryloylmorpholine (ACMO) was used instead of DMAA. The solid content of the reaction mixture was 40% by weight. GPC measurement of the obtained block copolymer II revealed a peak top molecular weight of 8,500 and an Mw / Mn ratio of 1.22. The acid value and amine value were 0 mgKOH / g. Block copolymer II had a linear second block in which block II-1 having a structural unit derived from MMA and block II-2 having a structural unit derived from BMA were linked at one end of each block, and a structural unit derived from ACMO (R in formula (1)) linked to the other end of block II-2. 1a , R 1b is a ring structure formed by -CH2-CH2- linked by -O-, and R 2 is a hydrogen atom. See formula (10-2). The first block has a block II-3 having a group II-1. That is, block copolymer II is a linear block copolymer having the first block at one end. Due to the monomer structure, block copolymer II does not have a basic group. The weight ratio of each block in block copolymer II (block II-1 / block II-2 / block II-3) is 33.7 / 32.7 / 33.6. Block copolymer II was used as dispersant II.

[0146] Example 1 <Production of Metal Oxide Fine Particle Dispersion> A mill base was prepared by adding 50.00 parts by weight of metal oxide A, 1.00 parts by weight of metal oxide B, 0.75 parts by weight of organometallic compound, and 18.75 parts by weight of dispersant I (solids concentration: 40 wt%) to 29.50 parts by weight of methyl isobutyl ketone (MIBK). 400 parts by weight of φ0.5 mm zirconia particles were added to 100 parts by weight of this mill base, and dispersion treatment 1 was carried out using a sand mill at 2000 rpm and 25°C for 1.5 hours. After removing the φ0.5 mm zirconia particles, MIBK was added to a solids concentration of 47 wt%. 400 parts by weight of φ0.05 mm zirconia particles were added to 100 parts by weight of this mill base, and dispersion treatment 2 was carried out using a sand mill at 2000 rpm and 25°C for 3.5 hours. The φ0.05 mm zirconia particles were then removed, and MIBK was added to a solids concentration of 35.25 wt% to obtain a metal oxide microparticle dispersion. The metal oxide B and the organometallic compound were mixed in advance, and the surface of the metal oxide B was coated with the organometallic compound before use in the dispersion treatment 1. The composition ratio (by weight) of the solid or nonvolatile content of the mill base is shown in Table 1.

[0147] <Production of Curable Composition> To the obtained metal oxide microparticle dispersion, a monomer component and a photopolymerization initiator were added so that the solid content (non-volatile content) ratio between metal oxide A and other components was 1 / 1, and MIBK was added and mixed so that the solid content concentration was 40% by weight, as shown in Table 1. Next, a mixed solvent of methyl ethyl ketone (MEK) and propylene glycol monomethyl ether (PM) in a weight ratio of 1:1 was added so that the solid content concentration was 30% by weight, and mixed to obtain a curable composition.

[0148] (Examples 2 to 10, Comparative Example 1) In the same manner as in Example 1, a dispersion of metal oxide fine particles was produced so as to have the component composition shown in Table 1, and a curable composition was obtained using this.

[0149] The components used in Examples 1 to 10 and Comparative Examples 1 to 4 shown in Table 1 are as follows: (1) Metal oxide A PCS Nippon Denko Corporation, PCS, zirconium oxide (ZrO2) particles, average primary particle diameter: approximately 20 nm, D50: 1.1 μm UEP-100 Daiichi Kigenso Kagaku Kogyo Co., Ltd., UEP-100, fine particles of zirconium oxide (ZrO2), average primary particle diameter: 8 nm, D50: 0.4-0.7 μm (2) Metal oxide B 50A Sakai Chemical Industry Co., Ltd., NANOFINE-50A, alumina-silica treated zinc oxide (ZnO) fine particles, average primary particle diameter: 20 nm MT-05 Teika Corporation, MT-05, (hydrated) alumina-silica treated titanium dioxide (TiO2), average primary particle size: 10 nm (3) Organometallic compounds AL-M Ajinomoto Fine-Techno Co., Ltd., PLENACT AL-M, organic aluminum compound, alkyl acetoacetate aluminum diisopropylate ZC-580 Matsumoto Fine Chemical Co., Ltd., Orgatix ZC-580, organic zirconium compound, zirconium dibutoxybis(ethylacetoacetate) (4) Dispersant C2091I NOF Corporation, Esleem C2091I, acid-type dispersant (5) Paint film forming components ·TAIC Mitsubishi Chemical Corporation, TAIC, triallyl isocyanurate (a triene monomer with an allyl group and an isocyanurate ring structure) NR1 KarenzMT (registered trademark) NR1, manufactured by Showa Denko K.K., 1,3,5-tris(2-(3-sulfanylbutanoyloxy)ethyl)-1,3,5-triazinane-2,4,6-trione (a trifunctional secondary thiol having an isocyanurate ring structure) PE1 Karenz MT (registered trademark) PE1, pentaerythritol tetrakis(3-mercaptobutyrate) (tetrafunctional secondary thiol), manufactured by Showa Denko K.K. DPHA Nippon Kayaku Co., Ltd., product name: KAYARAD DPHA, dipentaerythritol hexaacrylate (hexafunctional acrylate monomer) Initiator BASF, Irgacure 184, 1-hydroxycyclohexyl phenyl ketone (6) Additives 1010 BASF, Irganox 1010, hindered phenolic antioxidant AO-40 ADEKA Corporation, Adeka Stab AO-40, 6,6'-di-tert-butyl-4,4'-butylidenedi-m-cresol, antioxidant ·one two three BASF, Tinuvin 123, light stabilizer

[0150] (evaluation) <Yellowing evaluation> The curable compositions obtained in Examples 1 to 10 and Comparative Examples 3 and 4 were applied to a polyethylene terephthalate (PET) film (Lumirror® UH-13, manufactured by Toray Industries, Inc.) using a 0.15 mm bar coater and dried at 80°C for 2 minutes to form a coating film. The coating film was irradiated with light 10 times at an illuminance of 200 mW and an exposure dose of 300 mJ / □ (total exposure dose: 3,000 mJ / □) to react with the monomers of the film-forming components contained in the curable composition, yielding a cured film. This cured film was irradiated with light 50 times under the same conditions (total exposure dose: 18,000 mJ / □). The b values ​​of the cured films after 10 exposures and after a further 50 exposures were measured using an MCPD-6800 manufactured by Otsuka Electronics Co., Ltd., and the difference (Δb) between the two was calculated. The difference between the two, Δb, is calculated by subtracting the b value (b(10)) of the cured film irradiated with light a total of 10 times from the b value (b(60)) of the cured film irradiated with light a total of 60 times, i.e., Δb = b(60) - b(10).The evaluation criteria are as follows: ○: b(10)≦1.3 and Δb<0.5 △: b(10)≦1.3 and 0.6≧Δb≧0.5 ×: b(10)>1.3 or Δb>0.6

[0151] (Adhesion evaluation) In the same manner as in the evaluation of yellowing, a cured film with a total exposure of 18,000 mJ / □ was obtained. Using this cured film, tests were carried out in accordance with JIS K 5600-5-6, cross-cut method. The evaluation criteria were as follows: ○: Two or fewer peeled areas ×: Three or more peeled areas

[0152] (alkali resistance) A cured film with a total exposure of 3000 mJ / □ was obtained in the same manner as in the yellowing evaluation. This cured film was immersed in a 4% aqueous sodium hydroxide solution at room temperature for 10 minutes. Using a haze meter (NDH-4000 manufactured by Nippon Denshoku Industries Co., Ltd.), the haze (Hz) values ​​before and after immersion were measured, and the difference between them (ΔHz) was calculated. The difference between the two, ΔHz, was calculated by subtracting the Hz before immersion (initial Hz) from the Hz after immersion (post-immersion Hz), i.e., ΔHz = (post-immersion Hz) - (initial Hz). The evaluation criteria were as follows: ○: 0 or more and less than 0.5 ×: 0.5 or more

[0153] [Table 1]

[0154] As shown in Table 1, by using a combination of specific components, it is possible to prepare a dispersion and a curable composition in which metal oxide microparticles are well dispersed. Furthermore, by using the curable composition, the resulting cured film has good yellowing resistance and alkali resistance, and can make the patterned transparent conductive layer less visible. In particular, by using a specific coating film-forming component, it is also possible to improve adhesion. Therefore, it is clear that the above-mentioned metal oxide microparticle dispersion and curable composition are particularly suitable for forming index-matching layers.

Claims

1. fine particles A of at least one metal oxide A selected from zirconium oxide and barium titanate; Fine particles B of metal oxide B having an absorption maximum wavelength of less than 390 nm; organometallic compounds, a solvent, and A metal oxide fine particle dispersion containing a dispersant containing, as an active ingredient, a block copolymer having a linear structure with a first block at one end thereof, the first block having at least one type of structural unit selected from the structural units represented by the following formulas (1) and (2-2), and having no basic group: 【Chemistry 1】 (In formula (1), R １ａ , R １ｂ R each independently represents a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms, and at least one of them is not a hydrogen atom. １ａ , R １ｂ The hydrogen atom directly bonded to the carbon atom contained in each hydrocarbon group is —C(═O)—NR ５ａ R ５ｂ , -OC(=O)-NR ６ａ R ６ｂ , -NR ７ —C(═O)—NR ８ａ R ８ｂ , a cyclic amide group, -OH or -COOH, and when the aliphatic hydrocarbon group has 2 to 12 carbon atoms, the carbon-carbon bond may contain at least one double bond, and the -CH constituting the aliphatic hydrocarbon group ２ - is -O-, -C(=O)-, -C(=O)-O-, -O-C(=O)-, -C(=O)-NR ９ -, -NR １０ -C(=O)-, -NR １１ -C(=O)-O-, -OC(=O)-NR １２ -or-NR １３ —C(═O)—NR １４ It may be replaced with -. ５ａ ~R １４ each independently represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms, and R ５ａ and R ５ｂ , R ６ａ and R ６ｂ and R ８ａ and R ８ｂ At least one of each is not a hydrogen atom, and R ７ and R ８ａ or R ８ｂ , R １３ and R １４ may be linked to each other via a divalent hydrocarbon group having 1 to 4 carbon atoms to form a ring structure. １ａ and R １ｂ The aliphatic hydrocarbon groups having 1 to 4 carbon atoms may be linked together via —O— to form a ring structure. R ２ represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms. 【Chemistry 2】 (In formula (2-2), R ２９ , R ４５ each independently represents a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms, and at least one of them is not a hydrogen atom. The aliphatic hydrocarbon group is a group in which a hydrogen atom directly bonded to a carbon atom contained in the hydrocarbon group is —C(═O)—NR ３１ａ R ３１ｂ , -OC(=O)-NR ３２ａ R ３２ｂ , -NR ３３ —C(═O)—NR ３４ａ R ３４ｂ , a cyclic amide group, -CH which may be substituted with -OH or -COOH and which constitutes an aliphatic hydrocarbon group ２ - is -O-, -C(=O)-, -C(=O)-O-, -O-C(=O)-, -C(=O)-NR ３５ -, -NR ３６ -C(=O)-, -NR ３７ -C(=O)-O-, -OC(=O)-NR ３８ -or-NR ３９ —C(═O)—NR ４０ It may be replaced with -. ３１ａ ~R ４０ each independently represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms; R ３３ and R ３４ａ or R ３４ｂ , R ３９ and R ４０ may each form a ring structure by linking the nitrogen atoms together via a divalent hydrocarbon group having 1 to 4 carbon atoms. Furthermore, when the aliphatic hydrocarbon group has 2 to 12 carbon atoms, the carbon-carbon bond may contain at least one double bond. The aromatic hydrocarbon group is a group in which a hydrogen atom directly bonded to a carbon atom contained in the hydrocarbon group is —C(═O)—NR ４１ａ R ４１ｂ , -OC(=O)-NR ４２ａ R ４２ｂ , -NR ４３ —C(═O)—NR ４４ａ R ４４ｂ , a cyclic amide group, -OH or -COOH. ４１ａ ~R ４４ｂ each independently represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms; R ４３ and R ４４ａ or R ４４ｂ may form a ring structure by linking the nitrogen atoms together via a divalent hydrocarbon group having 1 to 4 carbon atoms. R ３０ represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms.

2. 2. The metal oxide fine particle dispersion according to claim 1, wherein the metal oxide B is at least one selected from the group consisting of titanium oxide and zinc oxide.

3. 3. The dispersion of metal oxide fine particles according to claim 1, wherein the organometallic compound is at least one selected from the group consisting of organoaluminum compounds and organozirconium compounds.

4. The structural unit represented by the formula (1) is １ａ and R １ｂ is a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms which may contain an amide group having no N—H bond, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms which may contain an amide group having no N—H bond, The structural unit represented by the formula (2-2) is ２９ and R ４５ is a monovalent aliphatic hydrocarbon group having 1 to 12 carbon atoms which may contain an amide group having no N-H bond, or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms which may contain an amide group having no N-H bond.

5. 5. The dispersion of metal oxide fine particles according to claim 1, wherein the block copolymer comprises a second block having a structural unit derived from a monomer having a polymerizable double bond.

6. 6. The metal oxide fine particle dispersion according to claim 5, wherein the monomer having a polymerizable double bond is at least one selected from the group consisting of nonionic water-soluble compounds and nonionic water-insoluble compounds.

7. A curable composition comprising the metal oxide fine particle dispersion according to any one of claims 1 to 6 and a coating film-forming component.

8. The curable composition according to claim 7, wherein the film-forming component comprises, as monomer components, polyene monomers and a polyfunctional thiol.

9. The curable composition according to claim 7 or 8, which is used to form an index matching layer.

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