KR20150032564A - Low refractive index film, curable composition for forming low refractive index film, optical member, and solid-state imaging device using same - Google Patents

Abstract

The present invention relates to a low refractive index film having an Abbe number of 5 to 40 and a refractive index of 1.3 to 1.5.

Description

TECHNICAL FIELD The present invention relates to a low refractive index film, a curable composition for forming a low refractive index film, an optical member, and a solid-state image pickup device using the same. BACKGROUND ART [0002]

The present invention relates to a low refractive index film, a curable composition for forming a low refractive index film, an optical member, and a solid state image pickup device using the same.

In recent years, most kinds of optical devices have a structure in which an antireflective low refractive index film is formed on the surface of an optical device. The optical device is not limited to a flat surface, and includes a luminance enhancement lens or a diffusion lens for a liquid crystal backlight, a Fresnel lens, a lenticular lens, or a microlens used for a screen of a video projection television. In such a device, a desired geometrical optical performance is obtained by forming a fine structure mainly by a resin material. In order to further impart antireflection properties to the device, a low refractive index film is formed in a shape suitable for the surface of the microstructure.

Particularly, research and development on the material, structure, etc. of the micro lens unit used in the solid-state image pickup device are progressing energetically (see, for example, Patent Documents 1 to 3). Background to the Background There is a demand for high performance for realizing efficient condensing while advancing the miniaturization of the solid-state image pickup device. In particular, in recent years, the size of one pixel has become very small in accordance with the increase in the size of the pixels. Further, in order to create more devices in a single manufacturing process, the wafer size used also increases. Under these circumstances, the improvement of the manufacturing quality and the product quality of the microlens unit becomes more important.

Japanese Patent Application Laid-Open No. 2006-186295 Japanese Patent Application Laid-Open No. 2006-98985 Japanese Patent Application Laid-Open No. 2007-119744

In the above-described antireflective low refractive index film, it is ideal that the film has optical characteristics such that the reflection is minimized and the transmittance of the transmitted light of the image sensor portion is maximized from the function required for the film. That is, it is preferable that the low refractive index film has a refractive index distribution equivalent to that of the high refractive index film in the visible light region, taking into consideration the relationship with the high refractive index film to be combined. However, since the conventional curable composition used for forming a low refractive index film has a small difference (difference) due to the wavelength of the refractive index as compared with the cured composition used for forming a high refractive index film, It has been confirmed that it is difficult to have a refractive index distribution.

An object of the present invention is to provide a low refractive index film which is suitable for a high refractive index film applied to an optical member such as a solid-state image sensor and has a desired optical property widely contributing to improvement of optical performance.

It is another object of the present invention to provide a curable composition for forming a low refractive index film that realizes the desired optical properties, a low refractive index film formed therefrom, an optical member having the same, and a solid state imaging device using the same.

The present inventors have found that by mixing a high refractive index material having a specific optical property (Abbe number and refractive index) with a low refractive index material having a specific optical property (Abbe number and refractive index) Refractive-index film having a low refractive index. It has been confirmed that the novel low refractive index film having this specific refractive index and Abbe number exhibits good optical performance in combination with the high refractive index film in accordance with the above requirements. The present invention has been completed on the basis of this finding, and the above problem has been solved by the following means.

[1] A low refractive index film having an Abbe number of 5 to 40 and a refractive index of 1.3 to 1.5.

[2] A low refractive index film according to [1], comprising a low refractive index material exhibiting an Abbe number of 40 to 80 and a refractive index of 1.2 to 1.4, and a high refractive index material exhibiting an Abbe number of 5 to 40 and a refractive index of 1.6 to 2.

[3] The low refractive index film described in [1] or [2], wherein the low refractive index material comprises at least one of a siloxane resin and a fluorine resin.

[4] The low refractive index film described in any one of [1] to [3], wherein the low refractive index material comprises hollow particles or non-hollow particles.

[5] The low refractive index film described in any one of [1] to [4], wherein the high refractive index material comprises titania or zirconia.

[6] The low refractive index film according to any one of [1] to [5], which comprises at least one of a dispersant, a surfactant, a polymerizable compound and a polymer thereof.

[7] A low refractive index film according to any one of [1] to [6], which is used for antireflection purposes.

[8] An optical member comprising the low-refractive-index film according to any one of [1] to [7].

[9] The optical member according to [8], wherein the low refractive index film is coated on the surface of the light transmitting member having a higher refractive index.

[10] A solid-state imaging device comprising the optical member according to [8] or [9].

[11] A curable composition for forming a low refractive index film, comprising a low refractive index material having an Abbe number of 40 to 80 and a refractive index of 1.2 to 1.4, and a high refractive index material exhibiting an Abbe number of 5 to 40 and a refractive index of 1.6 to 2.

[12] The curable composition for forming a low refractive index film according to [11], wherein the low refractive index material comprises at least one of a siloxane resin and a fluorine resin.

[13] The curable composition for forming a low refractive index film according to [11] or [12], wherein the low refractive index material comprises hollow particles or non-hollow particles.

[14] The curable composition for forming a low refractive index film according to any one of [11] to [13], wherein the high refractive index material comprises titania or zirconia.

[15] The curable composition for forming a low refractive index film according to any one of [11] to [14], which further comprises at least one of a dispersant, a surfactant, a polymerizable compound and a polymer thereof.

[16] A manufacturing method of an optical member set having a first optical member and a second optical member coated on the first optical member,

A step of preparing the curable composition according to any one of [11] to [15]

Applying the curable composition onto a second optical member,

And curing the curable composition to form a first optical member which is a low refractive index film.

[17] A method of producing a curable composition for forming a low refractive index film,

A first composition comprising a low refractive index material exhibiting an Abbe number of 40 to 80 and a refractive index of 1.2 to 1.4 and a second composition containing a Abbe number of 5 to 40 and a high refractive index material exhibiting a refractive index of 1.6 to 2, Way.

Throughout the present specification, the refractive index and the Abbe number are assumed to be the conditions measured in the later embodiments, unless otherwise specified. The term " prepare " means making the article widely available. For example, it includes not only synthesis or manufacture of the material but also procurement by purchase.

(Effects of the Invention)

INDUSTRIAL APPLICABILITY The low refractive index film of the present invention has an optical characteristic suitable for a high refractive index film applied to an optical member such as a solid-state image pickup device and contributes widely to improvement of optical performance in a product.

The curable composition of the present invention realizes a wavelength distribution of a desired refractive index and a good refractive index when formed into a low refractive index film, and has stability and good applicability. The cured film has optical transparency and is assembled into a product to exhibit excellent optical performance.

The optical member manufactured using the low refractive index film having excellent properties as described above and the solid-state image pickup device using the optical member exhibit excellent optical performance in which the reflected light is preferably suppressed / prevented in a wide wavelength region.

Further, according to the production method of the present invention, a curable composition, a low refractive index film, an optical member, and a solid-state imaging device which exhibit the above excellent performance can be preferably manufactured.

These and other features and advantages of the present invention will become more apparent from the following detailed description.

The low refractive index film which is a preferred embodiment of the present invention has a specific Abbe number and a refractive index. It is preferable to be formed of a curable composition employing a specific low refractive index material and a high refractive index material. A microlens unit is exemplified as a preferred embodiment of the optical member set using this low refractive index film as the optical member. This includes a low refractive index film (first optical member) comprising a specific low refractive index material and a high refractive index material and a plurality of micro lens bodies (second optical member) coated on the low refractive index film.

Hereinafter, the present invention will be described focusing on a specific low refractive index material and a high refractive index material in the curable composition and the low refractive index film according to the preferred embodiments. For the optical member set, a microlens unit is taken as an example, a low refractive index film is taken as an example of the first optical member, and a micro lens body is taken as an example of the second optical member.

≪ Curable composition >

In the present embodiment, the curable composition contains a low refractive index material and a high refractive index material. The content of the low refractive index material and the content of the high refractive index material in the composition are described below together with the description of each material. However, when it is defined as the whole, the low refractive index material is preferably 40 to 99 mass% By mass to 95% by mass. And is preferably 1 to 60 mass%, more preferably 5 to 55 mass%, for the high refractive index material. With respect to 100 parts by mass of the low refractive index material, the high refractive index material is preferably 1 to 45 parts by mass, and more preferably 5 to 35 parts by mass. The mixing ratio of the two materials is preferable because the desired refractive index and distribution thereof can be adjusted more effectively.

The curable composition of the present invention may be prepared by a conventional method, but it may be prepared by mixing the first composition containing the low refractive index material and the second composition of high refractive index material.

≪ Low refractive index material &

The refractive index of the low refractive index material is preferably 1.45 or less, more preferably 1.43 or less, further preferably 1.41 or less, further preferably 1.40 or less, even more preferably 1.39 or less, particularly preferably 1.37 or less, Is most preferable. Although there is no particular lower limit, it is practical to have a value of 1.2 or more. By selecting a specific resin as a constituent component of the low refractive index material, desired optical characteristics are realized, and unevenness among pixels is reduced. It is preferable to use hollow particles or non-hollow particles as the component contained in the composition. The low refractive index material represents a constituent component (usually, solid content) for forming a low refractive index film. The identification can be performed by the solvent employed in the later examples and the refractive index measured by the measuring method, unless otherwise specified. However, the solvent may be appropriately used in consideration of the dissolution and dispersion of the raw material liquid. This is the same for high refractive index materials. Further, the low refractive index material may satisfy the refractive index with one component, or two or more components may be combined to satisfy the refractive index. This is the same with respect to the Abbe number described below, and the same applies to the high refractive index material.

The Abbe number of the low refractive index material is preferably 40 or more, more preferably 45 or more, further preferably 50 or more, still more preferably 53 or more, and particularly preferably 55 or more. The upper limit is preferably 90 or less, more preferably 85 or less, still more preferably 80 or less, and particularly preferably 75 or less. When the Abbe number of the low refractive index material is set to be within this range, the film can be used in combination with the later high refractive index material to exhibit good optical characteristics.

The identification of Abbe number is evaluated by the refractive index measured by the solvent and measurement method employed in the later examples, unless otherwise specified.

<Siloxane resin composition>

The siloxane resin can be obtained through a hydrolysis reaction and condensation reaction using an alkoxysilane raw material described later. More specifically, the compound may be obtained by hydrolyzing a part or all of alkoxy groups of the alkyltrialkoxysilane to convert into a silanol group, and at least a part of the produced silanol groups are condensed to form Si-O-Si bonds . The siloxane resin may be a siloxane resin having a silsesquioxane structure such as a basket type, a ladder type, or a random type. The above-mentioned "basket type", "ladder type" and "random type" can refer to the structure described in Chemistry and application development of silsesquioxane material (CMC publication), for example.

(Silsesquioxane structure)

The siloxane resin of the present embodiment preferably has a silsesquioxane structure represented by the following formula (1).

^{_{- (R 1 SiO 3/2}} ) n - Formula (1)

(In the formula (1), R ¹ represents an alkyl group having 1 to 3 carbon atoms, and n represents an integer of 20 to 1000.)

The alkyl group represented by R &lt; ¹ &gt; is not particularly limited as long as it is in the carbon number range, and examples thereof include a methyl group, an ethyl group, a propyl group and an isopropyl group. Among them, a methyl group and an ethyl group are preferable, and a methyl group is particularly preferable. The alkyl group represented by R &lt; ^{1 &gt;} may be an alkyl group having no substituent or an alkyl group having a substituent, but is preferably an alkyl group having no substituent.

The substituent which the alkyl group represented by R ¹ may have is not preferably a group having a halogen atom or an ethylenically unsaturated bond, and an amino group (preferably an amino group having 0 to 20 carbon atoms, such as amino, N, N-dimethyl Amino, N, N-diethylamino, N-ethylamino, anilino etc.), a sulfonamide group (preferably a sulfonamide group having 0 to 20 carbon atoms such as N, N-dimethylsulfonamide, (Preferably an acyloxy group having 1 to 20 carbon atoms such as acetyloxy and benzoyloxy), a carbamoyl group (preferably having 1 to 20 carbon atoms (For example, N, N-dimethylcarbamoyl and N-phenylcarbamoyl), an acylamino group (preferably an acylamino group having 1 to 20 carbon atoms, such as acetylamino, benzoyl Amino, etc.).

In the present invention, unless otherwise stated, the silicon-containing polymer in which the main chain is constituted by siloxane bonds is referred to as polysiloxane or siloxane resin. Since silicon has four bonding hands, the basic constituent unit of the polysiloxane is classified into a number of organic groups represented by methyl groups or phenyl groups per one silicon atom, and can be divided into four as shown below. In the formula below, R is an organic group.

In the present invention, silsesquioxane means the generic term of polysiloxane in which the basic constituent unit is a T unit, unless otherwise specified. Since silicon in silsesquioxane bonds with three oxygen atoms and oxygen is bonded with two silicon atoms, the theoretical composition is RSiO _3/2 (Latin for three-quarters is "SESQUI" In the present embodiment, it is preferable that R in the T unit formula is the above-described R ^1, and the silsesquioxane structure moiety is contained as the specific content.

The siloxane resin of the present embodiment is contained in an amount of 65 mass% or more and 100 mass% or less of the entire siloxane resin contained in the cured film, that is, 65 mass% or more and 100 mass or less of the entire siloxane resin contained in the resin composition for forming a low refractive index film (curing composition) % Or less of the silsesquioxane structure is preferable. This ratio is preferably 80 mass% or more and 100 mass% or less, more preferably 95 mass% or more and 100 mass% or less, still more preferably 100 mass% or less (particularly 100 mass% , And other components may be included within a range that does not impair the desired effect). In addition, the siloxane resin of the present embodiment may contain a specific polysilsesquioxane structure singly or two or more kinds.

The siloxane resin of the present embodiment is preferably a hydrolyzed condensate obtained by hydrolysis and condensation of alkyltrialkoxysilane.

(Alkyltrialkoxysilane)

In the present embodiment, as a starting material, an alkoxysilane raw material containing an alkyltrialkoxysilane can be used for producing the hydrolysis condensation product. Further, the alkoxysilane raw material is intended to be a starting material composed of an alkoxysilane (silicon compound having an alkoxy group). By using alkyltrialkoxysilane as a raw material, the structure of the obtained hydrolyzed condensate becomes more flexible, and the wettability to the substrate can be increased by the presence of an organic component.

The alkyltrialkoxysilane is an organosilicon compound in which one alkyl group and three alkoxy groups are bonded to a silicon atom and can be represented by the following formula (2).

(2): ???????? R ² Si (OR ³ ) ₃ ?????

(R ² represents an alkyl group having 1 to 3 carbon atoms, and R ³ represents an alkyl group)

The alkyl group (R ² in the formula (2)) of the alkyltrialkoxysilane is not particularly limited as long as it is in the range of 1 to 3 carbon atoms, but a methyl group or an ethyl group is preferable, and a methyl group is particularly preferable.

The alkoxy group of the alkyltrialkoxysilane is not particularly limited, and examples thereof include a methoxy group and an ethoxy group. More specifically, R ³ in the formula (2) is preferably a linear or branched alkyl group having 1 to 20 carbon atoms. Particularly preferably 1 to 10 carbon atoms, and more preferably 1 to 4 carbon atoms. Particularly, an ethoxy group in which R ³ in the formula (2) is an ethyl group is preferable because the hydrolysis rate can be easily controlled.

Examples of the alkyltrialkoxysilane include methyltrimethoxysilane, methyltriethoxysilane, methyltripropoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, propyltrimethoxysilane, propyltriethoxysilane, etc. . Of these, methyltriethoxysilane and ethyltriethoxysilane are preferably used, and methyltriethoxysilane is particularly preferably used. As the alkyltrialkoxysilane, only one type may be used, or two or more types may be used in combination.

More preferably, at least 65 mass% of the alkoxysilane raw material is an alkyltrialkoxysilane, more preferably 80 mass% or more and 100 mass% or less, still more preferably 95 mass% or more and 100 mass% or less. It is preferable that the hydrolytic condensate structure obtained by the content within the above range is provided with flexibility and wettability to the workpiece.

(Tetraalkoxysilane)

As the alkoxysilane raw material, other alkoxysilanes may be used in addition to the above-mentioned trialkoxysilane, and among them, tetraalkoxysilane is preferable. The inclusion of tetraalkoxysilane is preferable because the cross-linking density in the hydrolysis-condensation product increases and electrical insulation, resistance to development and heat resistance of the film obtained by the film formation are further improved.

Tetraalkoxysilane is an organosilicon compound having four alkoxy groups bonded to silicon atoms and can be represented by the following formula (3).

Equation ^{(3): Si (OR 4} ) 4

(Each R ⁴ independently represents an alkyl group)

The alkoxy group of the tetraalkoxysilane is not particularly limited, and examples thereof include a methoxy group and an ethoxy group. More specifically, R ⁴ in the formula (3) is preferably a linear or branched alkyl group having 1 to 20 carbon atoms. Among them, the number of carbon atoms is preferably from 1 to 10, and more preferably from 1 to 4 carbon atoms. Particularly, an ethoxy group in which R ⁴ in the formula (3) is an ethyl group is preferable from the viewpoint of easy control of the hydrolysis rate.

Examples of the tetraalkoxysilane include tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane, tetraisopropoxysilane, tetra-n-butoxysilane, tetraisobutoxysilane, tetra- Ethoxy silane, and the like. Of these, tetramethoxysilane and tetraethoxysilane are preferably used.

As the tetraalkoxysilane, only one type or two or more types may be used in combination.

The content of the tetraalkoxysilane in the alkoxysilane raw material is not particularly limited, but is preferably 35 mass% or less, and more preferably 20 mass% or less. The lower limit is not particularly limited, but in the case of obtaining the effect of addition of tetraalkoxysilane, it is preferably 0.01 mass% or more, more preferably 0.1 mass% or more.

In the present specification, the expression of the compound is used to mean the compound itself, its salt, complex, and its ion. It is meant to include a derivative modified in a predetermined form within a range showing the desired effect. In the present specification, a substituent (including a linking group) which does not specify substitution or non-substitution means that the substituent may have an arbitrary substituent at that position. This also applies to compounds which do not specify substitution or non-substitution. As preferable substituent, the following substituent T is enumerated.

As the substituent T, the following are listed.

(Preferably an alkyl group having 1 to 20 carbon atoms such as methyl, ethyl, isopropyl, t-butyl, pentyl, heptyl, 1-ethylpentyl, benzyl, 2-ethoxyethyl, Etc.), an alkenyl group (preferably an alkenyl group having 2 to 20 carbon atoms, such as vinyl, allyl, oleyl etc.), an alkynyl group (preferably an alkynyl group having 2 to 20 carbon atoms, (Preferably a cycloalkyl group having 3 to 20 carbon atoms such as cyclopropyl, cyclopentyl, cyclohexyl, and 4-methylcyclohexyl), aryl (for example, (Preferably an aryl group having 6 to 26 carbon atoms such as phenyl, 1-naphthyl, 4-methoxyphenyl, 2-chlorophenyl and 3-methylphenyl), a heterocyclic group A heterocyclic group having from 2 to 20 hetero atoms such as 2-pyridyl, 4-pyridyl, 2-imidazolyl, 2-benzoimidazolyl, An alkoxy group (preferably an alkoxy group having 1 to 20 carbon atoms such as methoxy, ethoxy, isopropyloxy, benzyloxy, etc.), an aryloxy group (preferably, (For example, phenoxy, 1-naphthyloxy, 3-methylphenoxy and 4-methoxyphenoxy), an alkoxycarbonyl group (preferably having 2 to 20 carbon atoms (Preferably an amino group having from 0 to 20 carbon atoms such as amino, N, N-dimethylamino, N (N-dimethylamino) carbonyl group, , N-diethylamino, N-ethylamino, anilino), a sulfonamide group (preferably a sulfonamide group having 0 to 20 carbon atoms such as N, N-dimethylsulfonamide, Amide, etc.), an acyloxy group (preferably an acyloxy group having 1 to 20 carbon atoms, such as acetyloxy, benzo (Preferably a carbamoyl group having 1 to 20 carbon atoms such as N, N-dimethylcarbamoyl, N-phenylcarbamoyl and the like), an acylamino group An acylamino group having 1 to 20 carbon atoms such as acetylamino and benzoylamino), a cyano group or a halogen atom (e.g., a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, etc.).

When the compounds or substituents include an alkyl group, an alkenyl group, etc., they may be linear or branched, and may be substituted or unsubstituted. When they contain an aryl group, a heterocyclic group, etc., they may be monocyclic or bicyclic, and may be substituted or unsubstituted.

(Production of siloxane resin)

The siloxane resin contained in the resin composition for forming a low refractive index film (curable composition) of the present embodiment can be obtained through a hydrolysis reaction and a condensation reaction using the above-mentioned alkoxysilane raw material.

As the hydrolysis reaction and the condensation reaction, known methods may be used, and if necessary, a catalyst such as an acid or base may be used. As the catalyst, there are no particular limitations as long as it changes the pH, and specifically, examples of the acid (organic acid, inorganic acid) include nitric acid, oxalic acid, acetic acid, formic acid, hydrochloric acid and the like. Examples of the alkali include ammonia, triethylamine, . The amount to be used is not particularly limited as long as the siloxane resin satisfies a predetermined molecular weight.

If necessary, a solvent may be added to the reaction system of the hydrolysis reaction and the condensation reaction. The solvent is not particularly limited as long as the hydrolysis reaction and the condensation reaction can be carried out. Examples of the solvent include alcohols such as water, methanol, ethanol and propanol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether Esters such as methyl acetate, ethyl acetate, butyl acetate, and propylene glycol monomethyl ether acetate; ketones such as acetone, methyl ethyl ketone, and methyl isoamyl ketone; and the like. Among them, it is preferable to apply a solvent different from the solvent containing the siloxane resin described later, more preferably an alcohol compound having 1 to 5 carbon atoms or an ether compound having 2 to 6 carbon atoms.

Conditions (temperature, time, solvent amount) of the hydrolysis reaction and the condensation reaction are appropriately selected in accordance with the kind of the material to be used.

The weight average molecular weight of the siloxane resin used in the present embodiment is 1,000 to 50,000. Among them, the number is preferably 2,000 to 45,000, more preferably 2,500 to 25,000, and particularly preferably 3,000 to 25,000.

The weight average molecular weight is a value measured using a known GPC (gel permeation chromatography) and converted to standard polystyrene. Unless otherwise noted, in the GPC measurement, a tetrahydrofuran solution having a column temperature of 40 占 폚 and a sample concentration of 0.5% by mass was dissolved in 50% by volume of a column of Waters 2695 and GPC column KF-805L (three columns are directly connected) (Waters 2414) and a UV detection device (Waters 2996) to detect a sample peak.

The content of the siloxane resin in the composition (curable composition for forming a low refractive index film) of the present embodiment is preferably 5 mass% or more and 50 mass% or less with respect to the mass of the entire composition. In particular, it is more preferably 10 to 45 mass%, and particularly preferably 15 to 40 mass%.

(Surfactants)

The resin composition (curable composition) for forming a low refractive index film of the present embodiment preferably contains a surfactant having a polyoxyalkylene structure from the viewpoint of further improving the applicability. The polyoxyalkylene structure refers to a structure in which an alkylene group and a divalent oxygen atom are adjacent to each other and specifically includes an ethylene oxide (EO) structure and a propylene oxide (PO) structure. As the surfactant having a polyoxyalkylene structure, various surfactants such as a fluorine surfactant, a nonionic surfactant, a cationic surfactant, an anionic surfactant, and a silicone surfactant can be used as long as the surfactant has a polyoxyalkylene structure . Among these, nonionic surfactants, anionic surfactants and silicone surfactants are preferable, and nonionic surfactants and anionic surfactants are more preferable, and anionic surfactants are particularly preferable.

In the case of forming a film by using the coating liquid to which the resin composition for forming a low refractive index film according to the present embodiment is applied, the wettability to the surface to be coated is improved by lowering the interfacial tension between the surface to be coated and the coating liquid, The sex improves.

Examples of the fluorochemical surfactant include Megapac F171, Copper F172, Copper F173, Copper F176, Copper F177, Copper F141, Copper F142, Copper F143, Copper F144, Copper R30, Copper F437, Copper F479, Copper F482, Copper F554, S-141, S-145, S-145, S-144, S-143, and S-171 (all of which are products of Sumitomo 3M Limited), F- (Manufactured by ASAHI GLASS CO., LTD.), SC-103, SC-104, SC-105, SC-1066, SC-381, SC- PF636, PF656, PF6320, PF6520, and PF7002 (manufactured by OMNOVA) are listed as examples of the resin compositions of the present invention.

Specific examples of the nonionic surfactant include ethoxylates and propoxylates (e.g., glycerol propoxylate, glycerin ethoxylate, etc.) of glycerol, trimethylol propane, trimethylol ethane, polyoxyethylene lauryl ether, poly Polyoxyethylene stearyl ether, polyoxyethylene oleyl ether (Emulgen 404 from Kao Corporation), polyoxyethylene octylphenyl ether, polyoxyethylene nonylphenyl ether, polyethylene glycol distearate, polyethylene glycol distearate, AOKI OIL CO., LTD. And ELEBASE BUB-3 of the product.

Specific examples of the anionic surfactant include W004, W005, W017 (manufactured by Yusho Co., Ltd.), EMULSOGEN COL-020, EMULSOGEN COA-070, EMULSOGEN COL-080, DAI-ICHI KOGYO SEIYAKU CO., LTD . And the FlySurf A208B of the product.

As the silicone surfactant, for example, Dow Corning Toray Co., Ltd. TORAY Silicone SH3PA, TORAY Silicone SH7PA, TORAY Silicon DC11PA, TORAY Silicone SH21PA, TORAY Silicone SH28PA, TORAY Silicone SH29PA, TORAY Silicone SH30PA, TORAY Silicone SH8400, Momentive Performance Materials Inc. TSF-4440 "," TSF-4300 "," TSF-4445 "," TSF-4460 "," TSF-4452 ", Shin-Etsu Silicone Co., Ltd. BYK 307 "," BYK323 "," BYK 330 ", GELEST products" DBE-224 "and" DBE-621 "manufactured by BYK Chem are listed.

The surfactant may be used alone, or two or more surfactants may be used in combination.

As the surfactant having a preferred polyoxyalkylene structure of the present embodiment, there are listed surfactants represented by the following formula (4).

(4): ???????? R ⁵ O (R ⁶ O) _m R ⁷

(In the formula, R ⁵ represents an alkyl group having 1 to 20 carbon atoms, R ⁶ represents an alkylene group having 1 to 4 carbon atoms, R ⁷ represents a hydrogen atom, a carboxyl group or a -PO ₃ H _2. M is 1 to Represents an integer of 8.)

More specifically, R ⁵ in the formula (4) may be a linear or branched alkyl group. Among them, the number of carbon atoms is preferably from 5 to 20, and more preferably from 12 to 18 carbon atoms. R ⁶ in the formula (4) may be a linear or branched alkylene group, and includes a methylene group, an ethylene group, a propylene group, an isopropylene group, a butylene group and an isobutylene group. Among them, an ethylene group, an isopropylene group (a group forming an adjacent O atom and an ethylene oxide structure or a propylene oxide structure) is preferable. As R ⁷ in the formula (4), a hydrogen atom or a carboxyl group is preferable, and a carboxyl group is particularly preferable.

The amount of the surfactant to be added is not particularly limited, but the lower limit is preferably 1 part by mass or more, more preferably 1.5 parts by mass or more, and particularly preferably 7.5 parts by mass or more, relative to 100 parts by mass of the curable resin desirable. The upper limit value is not particularly limited, but is preferably 30 parts by mass or less, and more preferably 15 parts by mass or less.

In the resin composition of the present embodiment, other surfactants may be used in addition to or in addition to the above surfactants having a polyoxyalkylene structure. As the surfactant, those commonly used may be used, and among them, it is preferable to use a silicone surfactant. Preferred examples of the silicone surfactant include a polysiloxane type surfactant in which an organic group is introduced into the side chain or terminal, or side chain and terminal. Examples of the side chain group include an amino group, an epoxy group, a carbinol group, a mercapto group, a carboxyl group, a hydrogen group, a polyether group, an aralkyl group, a fluoroalkyl group and a phenyl group. Examples of the terminal group include amino group, epoxy group, carbinol group, methacryl group, polyether A mercapto group, a carboxyl group, a phenol group, a silanol group, and a diol group.

Or an alkylalkoxysilane compound having a specific carbon number (hereinafter referred to as &quot; alkoxysilane compound alpha &quot;), as well as a surfactant having a polyoxyalkylene structure as described above. Surfactants, silicone surfactants and alkoxysilane compounds? May be used in combination. As the alkoxysilane compound?, It is preferable to use an alkoxysilane compound having an alkyl group having 4 to 12 (more preferably 6 to 10 carbon atoms) carbon atoms. When represented by a general formula, it is preferably a compound represented by the following formula (5).

(5): Si (OR ⁵¹ ) _n-4 (R ⁵² ) _n

Here, R ⁵¹ is the same group as R ⁴ above. R ⁵² is preferably an alkyl group having from 4 to 12 carbon atoms, more preferably an alkyl group having from 6 to 10 carbon atoms. n is an integer of 1 to 3;

The amount of the surfactant to be used in combination with the surfactant having a polyoxyalkylene structure may be arbitrarily adjusted. For example, the surfactant may be added in an amount of 0.01 to 100 parts by mass per 100 parts by mass of the surfactant having a polyoxyalkylene structure More preferably from 1 to 100 parts by mass, and still more preferably from 10 to 100 parts by mass.

(Hollow particle / non-hollow particle)

It is preferable that the curable composition or the cured film thereof contains hollow particles. As the hollow particles, porous fine particles as well as a hollow structure may be used. The hollow particles are of a structure having a cavity therein and represent particles having a cavity surrounded by an outer periphery, and the porous particles represent porous particles having a plurality of cavities. Hereinafter, hollow particles or porous particles are appropriately referred to as &quot; specific particles &quot;. The specific particle may be an organic particle or an inorganic particle.

The specific particle porosity is preferably 10 to 80%, more preferably 20 to 60%, and most preferably 30 to 60%. It is preferable from the viewpoints of lowering the refractive index and maintaining the durability of the particles that the porosity of the specific particle falls within the above-mentioned range.

Among the specific particles, hollow particles are more preferable from the viewpoint of reducing the refractive index. For example, when the hollow particles are made of silica, the hollow silica particles have low refractive index air (refractive index = 1.0). Therefore, the refractive index is significantly lower than that of ordinary silica (refractive index = 1.6).

As a method for producing the hollow particles, for example, the method described in JP-A-2001-233611 can be applied. As a method for producing the porous particles, for example, the methods described in Japanese Patent Application Laid-Open Nos. 2003-327424, 2003-335515, 2003-226516 and 2003-238140 can be applied have.

The specific particle preferably has an average primary particle diameter of 1 nm to 200 nm, more preferably 10 nm to 100 nm.

Here, the average primary particle size of the specific particles can be obtained from the photographs obtained by observing the dispersed particles with a transmission electron microscope. The projected area of the particles is obtained, and the circle equivalent diameter is determined therefrom to obtain the average primary particle diameter. In the present specification, the average primary particle diameter is calculated by measuring the projected area with respect to 300 or more particles and obtaining the circle equivalent diameter.

The refractive index of the specific particle is preferably 1.10 to 1.40, more preferably 1.15 to 1.35, and particularly preferably 1.15 to 1.30.

In the present specification, the refractive index indicates the refractive index as a whole particle, and when the particle is a hollow particle, it does not indicate the refractive index only of the outer angle forming the hollow particle. When the particles are porous particles, the refractive index of the porous particles can be measured with an Abbe's refractive index meter (ATAGO CO., LTD.) (Measurement temperature 25 캜, wavelength 633 nm).

The specific particle is preferably hollow or porous inorganic particles from the viewpoint of lowering the refractive index. As inorganic low refractive index particles, magnesium fluoride and silica particles are listed, and silica particles are more preferable from the viewpoints of low refractive index, dispersion stability, and cost.

The average primary particle size of these inorganic particles is preferably 1 nm to 100 nm, more preferably 1 nm to 60 nm.

As long as the inorganic particles satisfy the required porosity, the crystal system may be either crystalline or amorphous, and even monodisperse particles may be aggregated particles provided that they satisfy a predetermined particle diameter. The spherical shape is particularly preferable, but it may be a shape having a ratio of a long diameter to a short diameter of 1 or more or an irregular shape.

A specific surface area of the inorganic particles is 10m ² / g~2,000m ² / g is preferable and, 20m ² / g~1,800m ² / g is more preferable and, 50m ² / g~1,500m ² / g which is particularly desirable.

In order to stabilize the dispersion in the curable composition or to improve the affinity and bondability with the binder component, the inorganic particles may be subjected to physical surface treatment such as plasma discharge treatment or corona discharge treatment, chemical surface treatment with a surfactant or a coupling agent . The use of a coupling agent is particularly preferred. As the coupling agent, an alkoxy metal compound (e.g., titanium coupling agent, silane coupling agent) is preferably used. Among them, silane coupling treatment is particularly effective.

That is, when the inorganic particles are silica particles and the coupling agent is a silane compound, the organosilyl group (monoorganosilyl, diorganosilyl, or triorganosilyl group) is reacted with the silica particles Lt; / RTI &gt; Examples of organic groups of the surface-treated silica particles on the surface thereof include saturated or unsaturated hydrocarbon groups of 1 to 18 carbon atoms and halogenated hydrocarbon groups of 1 to 18 carbon atoms.

The coupling agent may be used either as a surface treatment agent for the inorganic particles before the coating liquid for low refractive index film is prepared, or as an additive agent at the time of preparing the coating liquid.

It is preferable that the inorganic particles are dispersed in advance in the medium before the surface treatment in order to reduce the load of the surface treatment.

A more preferred form of a particular particle is a silica particle.

As the specific particles comprising silica, commercially available ones can be preferably used.

For example, there may be mentioned JGC C & C products Surulia series (hollow particles, isopropanol (IPA) dispersion, 4-methyl-2-pentanone (MIBK) dispersion etc.Surulia 2320 etc.), OSCAL series, Nissan Chemical Industries, Ltd. Products SNOWTEX series (porous particles, IPA dispersion, ethylene glycol dispersion, methyl ethyl ketone (MEK) dispersion, dimethylacetamide dispersion, MIBK dispersion, propylene glycol monomethyl acetate dispersion, propylene glycol monomethyl ether dispersion, methanol dispersion, Dispersion of butyl acetate, dispersion of xylene-n-butanol, dispersion of toluene, etc. MIBK-SD-L, MIBK-ST, etc.), Nittetsu Mining Co., Ltd. Products, SILUXOX (porous particles), Fuso Chemical Co., Ltd. PL-1-IPA, PL-2L-PGME, etc.), EVONIK Co., Ltd., AERO (trade name, Silica series such as a vaginal series (porous particles, propylene glycol acetate dispersion, ethylene glycol dispersion, MIBK dispersion, etc.) can be used.

When the silica particles are added as a dispersion containing silica particles and a particle dispersing agent (details of the particle dispersing agent will be described later), the content of the silica particles in the silica dispersion is preferably 10% by mass to 50% by mass, more preferably 15% By mass, more preferably 15% by mass to 30% by mass.

The content of the specific particle with respect to the total solid content in the curable composition (curable composition for forming a low refractive index film) is preferably 5% by mass to 95% by mass, more preferably 10% by mass to 90% by mass, More preferably 80% by mass.

When film is formed by using the curable composition, the application amount of the specific particles is 1mg / m ² ~100mg / m ² are preferred, and more preferably ^{5mg / m 2 ~80mg / m 2} , more preferably from 10mg / m ² To 60 mg / m &lt; ^{2 &} gt ;. By not less than 1mg / m ^2, as it is possible reliably to obtain the effect of improving the effect or scratch resistance of the low-refractive-index screen being less than 100mg / m ^2, by causing the fine irregularities on the cured film surface suppress the integral reflectance deterioration can do.

(Fluorine resin)

It is preferable that the curable composition or the cured film thereof contains a fluororesin. For example, the fluorine-based siloxane polymers described in JP-A-2004-21036 are enumerated.

The fluorine-based resin is a resin containing fluorine in the molecule of the substance, and specific examples thereof include polytetrafluoroethylene, polyhexafluoropropylene, tetrafluoroethylene / hexafluoropropylene copolymer, tetrafluoroethylene / perfluoroalkylvinyl Ether copolymers, tetrafluoroethylene / ethylene copolymers, hexafluoropropylene / propylene copolymers, polyvinylidene fluoride, vinylidene fluoride / ethylene copolymers, and the like.

Among them, polytetrafluoroethylene and tetrafluoroethylene / ethylene copolymer are preferable, polytetrafluoroethylene is preferable, and polytetrafluoroethylene-containing mixed powder composed of polytetrafluoroethylene particles and organic polymer Is preferably used.

Amorphous fluororesin is also preferably used, and commercially available products include CYTOP (manufactured by ASAHI GLASS CO., LTD.). The molecular weight of the fluorine-based resin such as polytetrafluoroethylene is preferably in the range of 100,000 to 1,000,000, more preferably in the range of 100,000 to 1,000,000, and is particularly effective for extrusion molding and flame retardancy. As a commercially available product of polytetrafluoroethylene, Du Pont-Mitsui Fluorochemicals Co., Ltd. "Teflon (registered trademark)" 6-J, "Teflon (registered trademark)" 6C-J, "Teflon (registered trademark)" 62-J from AIF, "Fluon" CD1 and CD076 have. As a commercially available product of polytetrafluoroethylene-containing mixed powder comprising polytetrafluoroethylene particles and an organic polymer, it is commercially available from Mitsubishi Rayon Co., Ltd. as "Metablen (registered trademark)" A series, (Registered trademark) A-3000, and Metablen (registered trademark) A-3800 are commercially available.

Examples of the fluororesin include fluororesins such as amorphous fluororesins, copolymerized oligomers containing acrylates or methacrylates containing perfluoroalkyl groups, fluorine-based coating agents, fluorine-based surface active agents, fluorine-based surface treatment agents containing electron beams or ultraviolet curing components, A fluorine-containing surface treatment agent and the like are also preferable. As the other copolymerizable component of the copolymerizable oligomer containing an acrylate or methacrylate containing a perfluoroalkyl group, alkyl acrylate or alkyl methacrylate is preferable.

Specific examples are shown below. Examples of the amorphous fluororesin include lumiflon and CYTOP available from ASAHI GLASS CO., LTD. Examples of the copolymerizable oligomer having a (per) fluoroalkyl group-containing (meth) acrylate and an alkyl (meth) acrylate as a main component include MODIFI F series manufactured by NOF Corporation, DAIKIN INDUSTRIES, Ltd. Product Unidyne, Megafac F470 series, F480 series and F110 series of DIC Corporation are listed, and copolymerization is more preferable for copolymerization. As the fluorine-based coating agent, Sumitomo 3M Inc. The product's EGC1700 is listed. Examples of the fluorochemical surfactant include Megapac F114, F410 series, 440 series, 450 series, and 490 series manufactured by DIC Corporation. Examples of the fluorine-based surface treatment agent containing an electron beam or an ultraviolet hardening component include Omnova Solutions, Inc. Products Polyfox PF-3320, NOK Corporation Chemnox FAMAC-8, Sumitomo 3M Inc. Product EGC1720. As the fluorine-based surface treatment agent containing a thermosetting component, Sumitomo 3M Inc. EGC1720 of the product, and NH-10 and NH-15 of DIC Corporation.

The fluororesin may be a mixture of plural kinds of fluorine-containing compounds.

The amount of the fluorine-based resin to be added is not particularly limited, but from the viewpoint of the siloxane resin, it is preferable that the content of the fluorine-containing resin is the same as that of the siloxane resin in the curable composition for forming a low refractive index film.

(Hardener)

The resin composition for forming a low refractive index film of the present embodiment may further contain a curing agent. As the curing agent, a curing agent consisting of Al, Mg, Mn, Ti, Cu, Co, Zn, Hf and Zr is preferable and they may be used in combination.

These curing agents can be easily obtained by reacting a metal alkoxide with a chelating agent. Examples of the chelating agent include? -Diketones such as acetylacetone, benzoyl acetone and dibenzoylmethane; Β-keto acid esters such as ethyl acetoacetate and ethyl benzoyl acetate, and the like can be used.

Preferable specific examples of the metal chelate compound include ethyl acetoacetate aluminum diisopropylate, aluminum tris (ethyl acetoacetoacetate), alkyl acetoacetate aluminum diisopropylate, aluminum monoacetylacetate bis (ethyl acetoacetate), aluminum tris Magnesium chelate compounds such as ethyl acetoacetate magnesium monoisopropylate, magnesium bis (ethyl acetoacetate), alkyl acetoacetate magnesium monoisopropylate, and magnesium bis (acetylacetonate), zirconium tetraacetyl Acetonate, zirconium tributoxyacetylacetonate, zirconium acetylacetonate bis (ethylacetoacetate), manganese acetylacetonato, cobalt acetylacetonato, Is acetylacetonate, titanium acetylacetonate, titanium oxy acetylacetonate are exemplified. Of these, aluminum tris (acetylacetonate), aluminum tris (ethylacetoacetate), magnesium bis (acetylacetonate), magnesium bis (ethylacetoacetate) and zirconium tetraacetylacetonate are preferable, and storage stability, , Aluminum tris (acetylacetonate) and aluminum tris (ethyl acetoacetate) are particularly preferable.

The total content of the curing agent is preferably 0.001 parts by mass to 10 parts by mass, more preferably 0.01 parts by mass to 5 parts by mass, and particularly preferably 0.01 parts by mass to 0.5 parts by mass, relative to 100 parts by mass of the total content of the siloxane resin Mass part.

<Solvent>

The resin composition for forming a low refractive index film (curable composition) of the present embodiment can be generally constituted by using an organic solvent. The organic solvent is not particularly limited so long as it satisfies the solubility of each component and the coating property of the resin composition for forming a low refractive index film, but is preferably selected in consideration of the solubility, coating ability, and safety of the binder. In preparing the resin composition for forming a low refractive index film in the present embodiment, two kinds of organic solvents may be included.

Examples of the organic solvent include esters such as ethyl acetate, n-butyl acetate, isobutyl acetate, amyl formate, isoamyl acetate, isobutyl acetate, butyl propionate, isopropyl butyrate, butyl butyrate, Ethyl lactate, alkyloxyacetate (e.g., methyl oxyacetate, ethyl oxyacetate, butyl oxyacetate (e.g., methyl methoxyacetate, ethyl methoxyacetate, butyl methoxyacetate, methyl ethoxyacetate, (For example, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, methyl 3-ethoxypropionate, methyl 3-ethoxypropionate, Ethyl 3-ethoxypropionate), 2-oxypropionic acid alkyl esters (e.g., methyl 2-oxypropionate, 2-oxypropionion Ethyl propionate, propyl 2-oxypropionate and the like (for example, methyl 2-methoxypropionate, ethyl 2-methoxypropionate, propyl 2-methoxypropionate, methyl 2-ethoxypropionate and ethyl 2-ethoxypropionate) Methyl 2-methylpropionate and ethyl 2-oxy-2-methylpropionate (for example, methyl 2-methoxy-2-methylpropionate, ethyl 2-ethoxy- , Ethyl pyruvate, propyl pyruvate, methyl acetoacetate, ethyl acetoacetate, methyl 2-oxobutanoate, ethyl 2-oxobutanoate and the like, and ethers such as diethylene glycol dimethyl ether, dipropylene glycol dimethyl ether, Tetrahydrofuran, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, methyl cellosolve acetate, ethyl cellosolve acetate, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, Propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether, propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether acetate, As the acetate and the like, ketones, for example, methyl ethyl ketone, cyclohexanone, 2-heptanone, 3-heptanone and the like, and aromatic hydrocarbons, for example, toluene, xylene and the like are preferably listed.

Particularly preferred are methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, ethylcellosolve acetate, ethyl lactate, diethylene glycol dimethyl ether, butyl acetate, methyl 3-methoxypropionate, 2- Butyl carbitol acetate, propylene glycol methyl ether, dipropylene glycol dimethyl ether, propylene glycol mono-n-butyl ether, propylene glycol mono-tert-butyl ether, and propylene glycol methyl ether acetate.

In the curable composition of the present invention, the solvent to be used is preferably 50 to 99.9 mass%, more preferably 60 to 95 mass%, of the total amount of the composition. When the amount of the compound is at least the lower limit value, the coating property becomes favorable. Also in the case of the upper limit value or less, the coating property is preferable, which is preferable.

The solvent of the curable composition of the present invention may be a solvent of a dispersion composition containing a late high refractive index material other than those described above, or a mixed solvent thereof.

(Viscosity)

The resin composition for forming a low refractive index film of the present embodiment preferably has a viscosity controlled from the viewpoint of forming a good transparent film having a thickness. The range of the specific viscosity is not particularly limited, but is preferably 1 to 20 cP, more preferably 2 to 15 cP, particularly preferably 4 to 6 cP. In the present specification, the value of viscosity is to be measured by a later measurement method unless otherwise specified.

·How to measure

Measurement is carried out at room temperature (about 25 ° C) using an E-type viscometer "TV-20 type viscometer, cone plate type TVE-20L" (manufactured by TOKI SANGYO CO., LTD.). Sampling is the average of the values measured five times every 100 seconds.

In the present invention, the term &quot; composition &quot; means that two or more components are present substantially uniformly in a specific composition. Here, substantially uniform means that each component may be localized within a range that exerts the action and effect of the present invention. The composition is not particularly limited as far as the above-defined definition is satisfied, but is not limited to a fluid or paste of fluidity, but includes a solid or powder composed of a plurality of components. It is also meant to include in the composition that the dispersion state is maintained for a predetermined time by stirring even when there is sediment.

&Lt; High refractive index material &

The curable composition of this embodiment contains a high refractive index material. The refractive index represented by the high refractive index material is preferably more than 1.45, more preferably 1.46 or more, even more preferably 1.50 or more, further preferably 1.55 or more, even more preferably 1.6 or more, particularly preferably 1.7 or more , Particularly preferably 1.8 or more, and most preferably 1.85 or more. The upper limit value is preferably 2 or less, more preferably 1.97 or less, further preferably 1.95 or less, and particularly preferably 1.93 or less.

The difference in refractive index between the low refractive index material and the high refractive index material is not particularly limited, but is preferably 0.3 to 0.75, more preferably 0.35 to 0.7.

The Abbe number of the high refractive index material is preferably 5 or more, more preferably 7 or more, further preferably 10 or more, and particularly preferably 12 or more. The upper limit is preferably 40 or less, more preferably 35 or less, still more preferably 30 or less, still more preferably 25 or less, and particularly preferably 20 or less. When the Abbe number of the high-refractive-index material is set in this range, the film is combined with the low-refractive-index material to obtain a good optical characteristic.

The identification of Abbe number is evaluated by the refractive index measured by the solvent and measurement method employed in the later examples, unless otherwise specified.

Hereinafter, preferred embodiments of the high refractive index material according to the present embodiment will be described in detail. However, the present invention is not limited to these embodiments.

Further, in the present invention, commercially available curable resins other than the resin compositions of the later embodiments can be preferably used. Open the product name (product number) below.

(1) Ultra high refractive index, high heat resistant coating materials: UR-108, UR-202, UR-501, HR-102 (manufactured by NISSAN CHEMICAL INDUSTRIES, LTD.

(2) High refractive index coating material for thick film: UR-108, UR-204, HR-201 (manufactured by NISSAN CHEMICAL INDUSTRIES, LTD.

(3) Thioepoxy resin LPH1101 (manufactured by MITSUBISHI GAS CHEMICAL COMPANY, INC.)

(4) Episulfide resin MR-174 (manufactured by Mitsui Chemicals, Inc.)

(5) Thiourethane resin MR-7 (manufactured by Mitsui Chemicals, Inc.)

In the present embodiment, the composition containing the high refractive index material is preferably formed of at least one dispersion composition selected from the following dispersion composition I, II or III.

(Dispersion Composition I)

The dispersion composition I is prepared by mixing a metal oxide particle (A) having a primary particle diameter of 1 nm to 100 nm and a graft copolymer (B) having a graft chain having a number of atoms of 40 to 10,000, , And the content of the metal oxide particles (A) is 50% by mass or more and 90% by mass or less based on the total solid content of the dispersion composition.

(A) metal oxide particles

As the metal oxide particles, oxide particles of titanium (Ti), zirconium (Zr), aluminum (Al), silicon (Si), zinc (Zn) or magnesium (Mg) are listed as high refractive index inorganic particles. TiO ₂ ) particles, zirconium dioxide (ZrO ₂ ) particles, or silicon dioxide (SiO ₂ ) particles. Among them, titanium dioxide particles (hereinafter sometimes simply referred to as "titanium dioxide") are more preferable.

The colorless or transparent titanium dioxide particles can be represented by the chemical formula TiO ₂ , and the purity is preferably 70% or more, more preferably 80% or more, and even more preferably 85% or more. Titanium oxide, titanium oxynitride or the like represented by the formula Ti _n O _{2n - 1} (n means 2 to 4) is preferably 30 mass% or less, more preferably 20 mass% or less, By mass or less.

The metal oxide particles are not particularly limited as long as the primary particle diameter is 1 nm to 100 nm. For example, the metal oxide particles can be appropriately selected from commercially available metal oxide particles. The primary particle size of the metal oxide particles is preferably 1 nm to 80 nm, and particularly preferably 1 nm to 50 nm. When the primary particle size of the metal oxide particles exceeds 100 nm, the refractive index and the transmittance may be lowered. In the case of less than 1 nm, the dispersibility and the dispersion stability may be deteriorated by coagulation.

The primary particle diameter of the metal oxide particles is obtained as the average particle diameter of the metal oxide particles. The average particle diameter of the metal oxide particles refers to a value obtained by diluting a mixed solution or dispersion containing metal oxide particles with propylene glycol monomethyl ether acetate by 80 times and measuring the resulting diluted solution by dynamic light scattering.

Here, the average particle diameter is measured by Nikkiso Co., Ltd. It is assumed that the number average particle diameter is obtained by using the product microtrack UPA-EX150. The same is true in the following embodiments.

The refractive index of the metal oxide particles is not particularly limited, but is preferably 1.75 to 2.70, and more preferably 1.90 to 2.70 from the viewpoint of obtaining a high refractive index. The method of measuring the refractive index is the same as that of the hollow particles.

In addition, the specific surface area of the metal oxide particles is 10m ² / g~400m ² / g is preferable and, 20m ² / g~200m ² / g, and a still more preferably, 30m ² / g~150m ² / g in the most desirable.

The shape of the metal oxide particles is not particularly limited. For example, be in the form of an atomic, spherical, cubic, spindle-shaped or amorphous phase.

The metal oxide particles may be surface-treated with an organic compound. Examples of the organic compound used in the surface treatment include polyols, alkanolamines, stearic acid, silane coupling agents and titanate coupling agents. Among them, a silane coupling agent is preferable.

The surface treatment may be a single surface treatment agent or a combination of two or more kinds of surface treatment agents.

It is also preferable that the surface of the metal oxide particles is covered with an oxide such as aluminum, silicon or zirconia. As a result, the weather resistance is improved.

Commercially available metal oxide particles can be preferably used.

As commercially available products of the titanium dioxide particles, for example, ISHIHARA SANGYO KAISHA, LTD. (TTO-S-1, TTO-S-2, TTO-V-3, etc.) and TAYCA CORPORATION products MT series (MT-01, MT-05, etc.).

Examples of commercially available zirconium dioxide particles include UEP (product of DAIICHI KIGENSO KAGAKU KOGYO CO., LTD.), PCS (product of Nippon Denko Co., Ltd.), JS-01, JS-03, JS-04 Co., Ltd.) and UEP-100 (manufactured by DAIICHI KIGENSO KAGAKU KOGYO CO., LTD.).

Commercially available products of the silicon dioxide particles include, for example, OG502-31 Clariant Co. products.

The metal oxide particles may be used singly or in combination of two or more kinds.

In order to obtain a very high refractive index when the dispersion composition (I) of the present embodiment is formed, the content of the metal oxide particles in the composition is preferably from 10 to 90 mass% with respect to the total solid content of the dispersion composition , More preferably from 10 to 50 mass%, even more preferably from 12 to 40 mass%, and particularly preferably from 15 to 35 mass%. On the other hand, in particular, for a microlens having a high refractive index, it is preferably 50% by mass to 90% by mass, more preferably 52% by mass to 85% by mass, and particularly preferably 55% by mass to 80% by mass relative to the total solid content of the dispersion composition %to be.

(B) a graft copolymer

The dispersion composition of the present embodiment includes a graft copolymer (hereinafter also referred to as &quot; specific resin &quot;). The graft copolymer of the present embodiment has a graft chain in which the number of atoms excluding hydrogen atoms is in the range of 40 to 10,000. In this case, the graft chain indicates from the main chain of the main chain of the copolymer to the end of the group branched from the main chain, from the atom bonded to the main chain in the group branched from the main chain. In the dispersion composition, the specific resin is a dispersion resin that imparts dispersibility to the metal oxide particles, and has affinity with a solvent by a graft chain. Therefore, the dispersibility of the metal oxide particles and the dispersion stability after aging are excellent Do. In addition, when the dispersion composition is used, it is considered that the graft chain and the solvent exhibit a good interaction with each other, whereby the uniformity of the film thickness in the coating film is suppressed.

As the graft copolymer (B), the number of atoms excluding hydrogen atoms per one graft chain is preferably 40 to 10000, more preferably 100 to 500 atoms excluding hydrogen atoms per graft chain, More preferably 150 to 260 atoms excluding hydrogen atoms. If the number is too small, the effect of steric repulsion may become small because the graft chain is short, and the dispersibility and the dispersion stability may be deteriorated in some cases. On the other hand, if the number of atoms other than the hydrogen atom per one graft chain is more than 10,000, the graft chain becomes excessively long, so that the adsorption force to the metal oxide particles decreases, and the dispersibility and the dispersion stability are sometimes deteriorated.

The number of atoms excluding the hydrogen atom per one graft chain is the number of atoms other than the hydrogen atoms contained in the atom from the source atom bonded to the polymer chain constituting the main chain to the end of the polymer branched from the main chain. When two or more graft chains are contained in the graft copolymer, the number of atoms other than the hydrogen atoms of at least one graft chain may satisfy the above requirement.

Examples of the polymer structure of the graft chain include a poly (meth) acrylic structure, a polyester structure, a polyurethane structure, a polyurea structure, a polyamide structure and a polyether structure. However, It is preferably a graft chain having a poly (meth) acrylic structure, a polyester structure, or a polyether structure, and more preferably a polyester structure or a polyether structure, in order to improve dispersibility and dispersion stability thereby.

The graft copolymer preferably has a structural unit (repeating unit) having the graft chain, and can be obtained, for example, by polymerizing a macromonomer having a polymer structure as a graft chain on the basis of a common method. The structure is not particularly limited as long as it has a substituent capable of reacting with the polymer main chain portion and a graft chain satisfying the requirements, but preferably a macromonomer having a reactive double bond group is preferably used.

AA-6 (Toagosei Company, Limited), AA-10 (Toagosei Company, Limited), AB-6 (Toagosei Company, Limited), AS-6 AA-714 (product of Toagosei Company, Limited), AY-707 (product of Toagosei Company, Limited), AN-6 (product of Toagosei Company, Limited) AK-30 (Toagosei Company, Limited), AK-32 (Toagosei Company, Limited), Blemmer PP-100 (manufactured by Toagosei Company, Limited) (NOF CORPORATION products), BLEMMER PP-500 (NOF CORPORATION products), BLEMMER PP-800 (NOF CORPORATION products), BLEMMER PP-1000 ), Blemmer PME-4000 (NOF CORPORATION product), Blemmer PSE-400 (NOF CORPORATION product), Blemmer PSE-1300 (NOF CORPORATION product) and Blemmer 43PAPE-600B (NOF CORPORATION product). Of these, AA-6 (Toagosei Company, Limited), AA-10 (Toagosei Company, Limited), AB-6 (Toagosei Company, Limited), AS- AN-6 (manufactured by Toagosei Company, Limited) and BLEMMER PME-4000 (manufactured by NOF CORPORATION).

The specific resin used in the present embodiment is preferably a structural unit having the graft chain and at least includes a structural unit represented by any one of the following formulas (1) to (4) It is more preferable to contain a structural unit represented by any one of the following formulas (2A), (3) and (4).

In the formulas (1) to (4), X ¹ , X ² , X ³ , X ⁴ and X ⁵ each independently represent a hydrogen atom or a monovalent organic group. It is preferably a hydrogen atom or an alkyl group having 1 to 12 carbon atoms, more preferably a hydrogen atom or a methyl group, and particularly preferably a methyl group.

In the formulas (1) to (4), W ¹ , W ² , W ³ and W ⁴ each independently represent an oxygen atom or NH, particularly preferably an oxygen atom.

R ³ in the formula (3) represents a branched or linear alkylene group (preferably 1 to 10 carbon atoms, more preferably 2 or 3), and from the viewpoint of dispersion stability, -CH ₂ -CH (CH ₃ ) - or a group represented by -CH (CH ₃ ) -CH ₂ - is preferable.

R ³ in the formula (3) may be a mixture of two or more kinds of R ³ having different structures in a specific resin.

In the formulas (1) to (4), Y ¹ , Y ² , Y ³ and Y ⁴ are each independently a single bond or a divalent linking group, and are not particularly limited in structure. Specifically, the following connecting groups (Y-1) to (Y-21) are listed. In the following structure, A and B mean the combination of the left end term and the right end term in the formulas (1) to (4), respectively. Among the structures shown below, from the simplicity of synthesis, it is more preferable that (Y-2) and (Y-13).

In the formulas (1) to (4), Z ¹ , Z ² , Z ^3, and Z ⁴ are each independently a hydrogen atom or a monovalent substituent, and the structure of the substituent is not particularly limited, , A hydroxyl group, an alkoxy group, an aryloxy group or a heteroaryloxy group, an alkylthioether group, an arylthioether group or a heteroarylthioether group, and an amino group. Of these, particularly preferred from the viewpoint of improvement of dispersibility are those having a steric repulsion effect. As the monovalent substituent represented by Z ^{1 to} Z ³ , an alkyl group having 5 to 24 carbon atoms or an alkoxy group having 5 to 24 carbon atoms Among them, particularly preferred are each independently an alkoxy group having a branched alkyl group having 5 to 24 carbon atoms or an alkoxy group having a cyclic alkyl group having 5 to 24 carbon atoms. The monovalent substituent represented by Z ⁴ is preferably an alkyl group having 5 to 24 carbon atoms, and among them, a branched alkyl group having 5 to 24 carbon atoms or a cyclic alkyl group having 5 to 24 carbon atoms is preferable.

In the formulas (1) to (4), n, m, p and q are each an integer of 1 to 500.

In the formulas (1) and (2), j and k each independently represent an integer of 2 to 8.

J and k in the formulas (1) and (2) are preferably an integer of 4 to 6 and particularly preferably 5 from the viewpoint of dispersion stability.

In the formula (4), R ⁴ represents a hydrogen atom or a monovalent organic group, and is preferably a hydrogen atom, an alkyl group, an aryl group or a heteroaryl group, more preferably a hydrogen atom or an alkyl group . When R is an alkyl group, the alkyl group is preferably a straight chain alkyl group having from 1 to 20 carbon atoms, a branched alkyl group having from 3 to 20 carbon atoms, or a cyclic alkyl group having from 5 to 20 carbon atoms, more preferably a straight chain alkyl group having from 1 to 20 carbon atoms And straight chain alkyl groups having 1 to 6 carbon atoms are particularly preferable.

R ⁴ in the formula (4) may be a mixture of two or more kinds of R ⁴ having different structures in a specific resin.

From the viewpoint of dispersion stability, the structural unit represented by the above formula (1) is more preferably a structural unit represented by the following formula (1A) or (2A).

Formula (1A) of the, X ^1, Y ^1, Z ¹ and n is ^1, X, Y ^1, Z ^1, and the same as n, and the preferred range is also the same in the formula (1).

Expression (2A) of, X ^2, Y ^2, Z ² and m is ^2, X, Y ^2, Z ^2, and the same as m, and the preferable range is also the same in the formula (2).

As the specific resin, it is more preferable to have the structural unit represented by the above formula (1A).

In the specific resin, the structural unit (repeating unit) having the graft chain is contained in an amount of 10% to 75%, preferably 12% to 50%, based on the total mass of the specific resin, , More preferably from 15% to 40%. Within this range, the dispersibility and dispersion stability of the metal oxide particles are high, and the uniformity of the film thickness in the coating film formed by using the dispersion composition is further improved. The specific resin may be a combination of graft copolymers having two or more different structures.

The specific resin is preferably a polymer having an acid group-containing structural unit (repeating unit) in an amount of 25 mass% or more and 90 mass% or less based on the total mass of the specific resin. The content of the structural unit having an acid group is more preferably 50 mass% or more and 80 mass% or less, and particularly preferably 60 mass% or more and 75 mass% or less, with respect to the total mass of the specific resin. If the content of the structural unit having an acid group is less than 25 mass% with respect to the total mass of the specific resin, the adsorption of the specific resin into the metal oxide particles becomes insufficient and the dispersion stability becomes poor.

If the content of the structural unit having an acid group exceeds 90 mass% with respect to the total mass of the specific resin, the introduction amount of the graft chain into the specific resin becomes insufficient, and the dispersion stability becomes poor. Similarly, It is difficult for the car to form a small film.

Also, the content of the structural unit having an acid group is within the above range, whereby the acid value of the specific resin can be preferably adjusted within the following preferable range.

The acid group can also function as a functional group capable of forming an interaction with the metal oxide particles in addition to the graft chain.

Examples of the acid group include a carboxylic acid group, a sulfonic acid group, a phosphoric acid group and a phenolic hydroxyl group, and from the viewpoints of adsorption power to metal oxide particles and dispersibility and dispersion stability, carboxylic acid groups, sulfonic acid groups and phosphoric acid groups At least one kind is preferable, and a carboxylic acid group is particularly preferable.

Further, it is preferable that the acid group structure is separated from the main chain of the resin structure by 5 atoms or more. As the acid group, a carboxylic acid bonded to an aromatic ring is particularly preferable.

These acid groups can be used singly or in combination of two or more kinds.

The acid value of the specific resin is preferably in the range of 70 mgKOH / g or more and 350 mgKOH / g or less, more preferably in the range of 80 mgKOH / g or more and 300 mgKOH / g or less, still more preferably 100 mgKOH / g or more and 250 mgKOH / g or less to be. By setting the acid value within the above range, even when the dispersion composition is applied to a wafer of a large size (for example, 12 inches), a film having a small difference in film thickness between the central portion and the peripheral portion of the wafer can be obtained more reliably.

The acid value of the specific resin can be calculated from the average content of acid groups in the specific resin, for example. In addition, a resin having a desired acid value can be obtained by changing the content of the monomer unit containing an acid group constituting a specific resin.

The specific resin may further have a structural unit (repeating unit) having a functional group capable of forming an interaction with the metal oxide particle other than the graft chain and the acid group. Such a structural unit having a functional group capable of forming an interaction with other metal oxide particles is not particularly limited in its structure. For example, a structural unit having a basic group, a structural unit having a coordinating group, a structural unit having a reactive group .

Examples of the basic group include a primary amino group, a secondary amino group, a tertiary amino group, a heterocyclic ring containing an N atom, and an amide group. Particularly preferred is a tertiary amino group having good adsorption ability to metal oxide particles and high dispersibility and dispersion stability. These basic groups may be used singly or in combination of two or more.

The content of the structural unit having a basic group is 0.1% by mass or more and 50% by mass or less with respect to the total mass of the specific resin, Is not less than 0.1 mass% and not more than 30 mass%.

Examples of the coordinating group and reactive group include, for example, an acetyl acetoxy group, a trialkoxysilyl group, an isocyanate group, an acid anhydride residue, and an acid chloride residue. Particularly preferred are acetyl acetoxy groups having good adsorption ability to metal oxide particles and high dispersibility and dispersion stability. As the coordinating group and the reactive group, they may be used singly or in combination of two or more.

The specific resin may or may not contain a structural unit (repeating unit) having a coordinating group or a reactive group, but when contained, the content of the structural unit having a coordinating group or reactive group is preferably 0.1 mass % Or more and 50 mass% or less, particularly preferably 0.1 mass% or more and 30 mass% or less.

The specific resin is a structural unit having a functional group capable of forming an interaction with the metal oxide particle, which is different from the structural unit having the graft chain and the structural unit having the acid group, wherein the structural unit represented by the following formulas (i) to (iii) Or a repeating unit derived from a monomer represented by any one of the following repeating units.

In the formulas (i) to (iii), R ¹ , R ² and R ³ each independently represent a hydrogen atom, a halogen atom (for example, fluorine, chlorine or bromine), or an alkyl group having 1 to 6 carbon atoms For example, a methyl group, an ethyl group, a propyl group, etc.).

R ¹ , R ² and R ³ are more preferably a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and particularly preferably a hydrogen atom or a methyl group. It is particularly preferred that R ² and R ³ are hydrogen atoms.

X represents an oxygen atom (-O-) or an imino group (-NH-), preferably an oxygen atom.

L is a single bond or a divalent linking group. Examples of the divalent linking group include a divalent aliphatic group (e.g., an alkylene group, a substituted alkylene group, an alkenylene group, a substituted alkenylene group, an alkynylene group, a substituted alkynylene group) (-O-), a sulfur atom (-S-), an imino group (-NH-), a substituted imino group (-NR ³¹ -, wherein R ³¹ is an aliphatic Group, an aromatic group or a heterocyclic group) or a carbonyl group (-CO-).

The bivalent aliphatic group may have a cyclic structure or a branched structure. The number of carbon atoms of the aliphatic group is preferably 1 to 20, more preferably 1 to 15, and even more preferably 1 to 10.

The aliphatic group is preferably a saturated aliphatic group rather than an unsaturated aliphatic group. The aliphatic group may have a substituent. Examples of the substituent include a halogen atom, a hydroxyl group, an aromatic group and a heterocyclic group.

The number of carbon atoms of the bivalent aromatic group is preferably from 6 to 20, more preferably from 6 to 15, and particularly preferably from 6 to 10. The aromatic group may have a substituent. Examples of the substituent include a halogen atom, a hydroxyl group, an aliphatic group, an aromatic group and a heterocyclic group.

The bivalent heterocyclic group preferably has a 5-membered ring or a 6-membered ring as a heterocyclic ring. The heterocycle may be condensed with another heterocycle, an aliphatic ring or an aromatic ring. The heterocyclic group may have a substituent. Examples of the substituent include a halogen atom, a hydroxy group, an oxo group (= O), a thioxo group (= S), an imino group (= NH), a substituted imino group (= NR ³² , wherein R ³² represents an aliphatic group, ), An aliphatic group, an aromatic group and a heterocyclic group.

L is preferably a divalent linking group containing a single bond, an alkylene group or an oxyalkylene structure. More preferably, the oxyalkylene structure is an oxyethylene structure or an oxypropylene structure. Further, L may contain a polyoxyalkylene structure containing two or more oxyalkylene structures repeatedly. The polyoxyalkylene structure is preferably a polyoxyethylene structure or a polyoxypropylene structure. The polyoxyethylene structure is represented by - (OCH ₂ CH ₂ ) _n -, and n is preferably an integer of 2 or more, more preferably an integer of 2 to 10.

In the above formulas (i) to (iii), Z represents a functional group capable of forming an interaction with the metal oxide particle, and is preferably an acid group, a basic group or a group having reactivity, and the carboxylic acid group or the tertiary More preferably an amino group, and still more preferably a carboxylic acid group. Y represents a methine group or a nitrogen atom.

R ⁴ , R ⁵ and R ⁶ each independently represent a hydrogen atom, a halogen atom (for example, fluorine, chlorine or bromine), an alkyl group having 1 to 6 carbon atoms (for example, A methyl group, an ethyl group, a propyl group, etc.), Z or -LZ. Here, L and Z are the same as those in the above. As R ⁴ , R ⁵ and R ⁶ , a hydrogen atom or an alkyl group having 1 to 3 carbon atoms is preferable, and a hydrogen atom is more preferable.

As the monomer represented by the formula (i), it is preferable that R ¹ , R ² and R ³ are a hydrogen atom or a methyl group, L is a divalent linking group containing an alkylene group or an oxyalkylene structure, X is an oxygen atom or an imino group And Z is a carboxylic acid group.

As the monomer represented by the formula (ii), a compound wherein R ¹ is a hydrogen atom or a methyl group, L is an alkylene group, Z is a carboxylic acid group, and Y is a methine group is preferable. As the monomer represented by the formula (iii), a compound wherein R ⁴ , R ⁵ and R ⁶ are a hydrogen atom or a methyl group and Z is a carboxylic acid group is preferable.

Examples of representative compounds represented by the formulas (i) to (iii) include methacrylic acid, crotonic acid, isocrotonic acid, compounds having an addition polymerizable double bond and a hydroxyl group in the molecule (for example, a compound having 2-hydroxyethyl methacrylate Ethyl) and succinic anhydride, a reaction product of a compound having an addition polymerizable double bond and a hydroxyl group and a phthalic anhydride in the molecule, a reaction product of a compound having an addition polymerizable double bond and a hydroxyl group in the molecule and a tetrahydroxyphthalic anhydride, A reaction product of a compound having a polymerizable double bond and a hydroxyl group and anhydrous trimellitic acid, a reaction product of an addition polymerizable double bond and a compound having a hydroxyl group in the molecule and a pyromellitic anhydride, acrylic acid, acrylic acid dimer, acrylic acid oligomer, Fumaric acid, 4-vinylbenzoic acid, vinylphenol, 4-hydroxyphenylmethacrylamide, and the like.

In order to improve various performances, the specific resin contained in the dispersion composition of the metal oxide particles may contain a structural unit having the graft chain, a structural unit having the acid group and / In addition to the structural unit having a functional group capable of forming an interaction with the metal oxide particle different from the structural unit of these structural units, it is also possible to use other structural unit having various functions, for example, a functional group having affinity with a dispersion medium used in the dispersion And the like may be further contained as a structural unit derived from a copolymerizable component.

Examples of the copolymerizable component copolymerizable with a specific resin include radically polymerizable compounds selected from (meth) acrylic acid esters, styrenes, acrylonitriles, methacrylonitriles, acrylamides, methacrylamides and the like .

Specifically, there may be mentioned, for example, acrylic acid esters such as alkyl acrylate (the number of carbon atoms in the alkyl group is preferably 1 to 20), (specifically, benzyl acrylate, 4-biphenylacrylate, Butyl acrylate, 4-t-butyl acrylate, 4-chlorophenyl acrylate, pentachlorophenyl acrylate, 4-cyanobenzyl acrylate, cyanomethyl acrylate, Ethyl acrylate, 2-ethylhexyl acrylate, heptyl acrylate, hexyl acrylate, isobornyl acrylate, isopropyl acrylate, methyl acrylate, 3-ethylhexyl acrylate, 3-ethylhexyl acrylate, , 5-dimethyladamantyl acrylate, 2-naphthyl acrylate, neopentyl acrylate, octyl acrylate, phenethyl acrylate, phenyl acrylate , Propyl acrylate, tolylacrylate, amyl acrylate, tetrahydrofurfuryl acrylate, 2-hydroxyethyl acrylate, 3-hydroxypropyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate 5-hydroxypentyl acrylate, allyl acrylate, 2-aryloxyethyl acrylate, propargyl acrylate, etc.),

Methacrylic acid esters (e.g., benzyl methacrylate, 4-biphenyl methacrylate, butyl methacrylate, sec.) Such as alkyl methacrylate (the number of carbon atoms in the alkyl group is preferably from 1 to 20) Butyl methacrylate, 4-t-butyl phenyl methacrylate, 4-chlorophenyl methacrylate, pentachlorophenyl methacrylate, 4-cyanophenyl methacrylate, cyanomethyl Methacrylate, cyclohexyl methacrylate, 2-ethoxyethyl methacrylate, ethyl methacrylate, 2-ethylhexyl methacrylate, heptyl methacrylate, hexyl methacrylate, isobornyl methacrylate, iso Propyl methacrylate, methyl methacrylate, 3,5-dimethyladamanthyl methacrylate, 2-naphthyl methacrylate, neopentyl methacrylate, octyl methacrylate, phenethyl methacrylate, Hydroxyethyl methacrylate, 3-hydroxypropyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxypropyl methacrylate, Propyl methacrylate, propyl methacrylate, 2-diethylaminoethyl methacrylate, 4-hydroxybutyl methacrylate, 5-hydroxypentyl methacrylate, allyl methacrylate, 2-aryloxyethyl methacrylate, 2-dimethylaminomethacrylate, etc.),

There may be mentioned styrene such as styrene and alkylstyrene such as methylstyrene, dimethylstyrene, trimethylstyrene, ethylstyrene, diethylstyrene, isopropylstyrene, butylstyrene, hexylstyrene, cyclohexylstyrene, decylstyrene, benzylstyrene, Methylstyrene, trifluoromethylstyrene, ethoxymethylstyrene, acetoxymethylstyrene, etc.), alkoxystyrene (e.g., methoxystyrene, 4-methoxy-3-methylstyrene, dimethoxystyrene etc.), halogen styrene (For example, chlorostyrene, dichlorostyrene, trichlorostyrene, tetrachlorostyrene, pentachlorostyrene, bromostyrene, dibromostyrene, iodostyrene, fluorostyrene, trifluorostyrene, 2- -Trifluoromethylstyrene, 4-fluoro-3-trifluoromethylstyrene, etc.), acrylonitrile, methacrylonitrile, and the like.

Of these radically polymerizable compounds, methacrylic acid esters, acrylamides, methacrylamides, and styrenes are preferably used.

These radically polymerizable compounds may be used singly or in combination of two or more. The specific resin may or may not contain the above-mentioned radical polymerizing compound, but if contained, the content of the structural unit corresponding to the radical polymerizing compound is 0.1% by mass or more and 50% by mass or less with respect to the total mass of the specific resin , Particularly preferably not less than 0.1 mass% and not more than 30 mass%. The specific resin can be synthesized by a conventionally known method.

Specific examples of the specific resin include the following Exemplary Compounds 1 to 32, but the present invention is not limited thereto. In the following exemplified compounds, the numerical values (referred to as the main chain repeating unit) stipulated in each structural unit represent the content of the structural unit [expressed in mass%: (wt%)]. The numerical value stipulated in the repeating portion of the side chain indicates the number of repetitions of the repeating portion.

The weight average molecular weight of the specific resin (polystyrene reduced value measured by the GPC method) is preferably 5,000 or more and 300,000 or less, more preferably 7,000 or more and 100,000 or less, and particularly preferably 10,000 or more and 50,000 or less.

In the dispersion composition (I), the specific resins may be used singly or in combination of two or more.

The content of the specific resin with respect to the total solid content of the dispersion composition (I) is preferably from 10 to 50 mass%, more preferably from 11 to 40 mass%, and most preferably from 12 to 30 mass%, from the viewpoints of dispersibility and dispersion stability. The range of mass% is more preferable.

- Other dispersed resin -

The dispersion composition (I) may contain a dispersion resin other than the specific resin (hereinafter sometimes referred to as &quot; other dispersion resin &quot;) for the purpose of adjusting the dispersibility of the metal oxide particles.

Examples of other dispersing resins which can be used include polymer dispersing agents such as polyamide amines and their salts, polycarboxylic acids and their salts, high molecular weight unsaturated acid esters, modified polyurethanes, modified polyesters, modified poly (meth) Methacrylic copolymer, naphthalenesulfonic acid formalin condensate], and polyoxyethylene alkylphosphoric acid ester, polyoxyethylene alkylamine, alkanolamine, pigment derivative and the like.

Other dispersing resins can be further classified into linear polymers, terminal modified polymers, graft polymers, and block polymers from the structure.

Specific examples of other dispersing resins include Disperbyk-101 (polyamide amine phosphate), 107 (carboxylic acid ester), 110 (copolymer containing an acid group), 130 (polyamide), 161, 162 and 163 EFKA 4047, 4050, 4010, 4165 (polyurethane), EFKA 4330 (high molecular weight unsaturated polycarboxylic acid), BYK-P104 (High molecular weight polycarboxylic acid salt), 6220 (fatty acid polyester), 6745 (phthalocyanine derivative), 6750 (high molecular weight polycarboxylic acid salt), 4340 (block copolymer), 4400, 4402 (modified polyacrylate) (Azo pigment derivative) &quot;, Ajinomoto Fine-Techno Co., Inc. Product "Ajisper-PB821, PB822", Kyoeisha Chemical Co., Ltd. Products "Floren TG-710 (urethane oligomer)", "POLYFLOW No." 50E, No. 300 (acrylic copolymer) ", Kusumoto Chemicals, Ltd. 703-50, DA-705, DA-725 &quot;, manufactured by Kao Corporation &quot; DERSPARON KS-860, 873SN, 874, # 2150 (aliphatic polycarboxylic acid), # 7004 (polyetherester) (Aromatic polycarboxylic acid), &quot; Mulgene 920, 930, &lt; RTI ID = 0.0 &gt; 935, 985 (polyoxyethylene nonylphenyl ether) "," acetamin 86 (stearylamine acetate) ", the product of The Lubrizol Corporation" Solspers 5000 (phthalocyanine derivative), 22000 (azo pigment derivative) ), 3000, 17000, 27000 (polymer having a functional part at the terminal), 24000, 28000, 32000, 38500 (graft polymer) ", Nikko Chemicals Co., Ltd. NIKOL T106 (polyoxyethylene sorbitan monooleate), and MYS-IEX (polyoxyethylene monostearate) &quot;.

These other resins may be used alone or in combination of two or more.

The content of the other dispersing resin in the total solid content of the dispersion composition (I) is preferably in the range of 1 to 20 mass%, more preferably in the range of 1 to 20 mass% And more preferably 10% by mass.

(C) Solvent

The dispersion composition (I) contains a solvent, but the solvent may be composed of various organic solvents.

Examples of the organic solvent usable herein include acetone, methyl ethyl ketone, cyclohexane, ethyl acetate, ethylene dichloride, tetrahydrofuran, toluene, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol dimethyl ether, propylene glycol monomethyl But are not limited to, ether, propylene glycol monoethyl ether, acetylacetone, cyclohexanone, diacetone alcohol, ethylene glycol monomethyl ether acetate, ethylene glycol ethyl ether acetate, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether acetate, Propanol, methoxymethoxyethanol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether Lactate, and the like 3-methoxypropyl acetate, N, N- dimethylformamide, dimethyl sulfoxide, γ- lactone -butyrolactone, methyl lactate.

These organic solvents may be used alone or in combination. The concentration of the solid content in the dispersion composition (I) is preferably from 2 to 60% by mass.

The dispersible composition (I) of the present embodiment is preferably constituted by including a polymerizable compound (D) and a polymerization initiator, and optionally containing other components.

(D) a polymerizable compound

(D) The polymerizable compound is an addition-polymerizable compound having a polymerizable group such as at least one ethylenically unsaturated double bond, an epoxy group and an oxetanyl group, and is selected from a compound having at least one polymerizable group, do. Such compounds are widely known in the technical field, and they can be used without particular limitation in the present invention.

They have, for example, chemical forms such as monomers, prepolymers, i.e., oligomers such as dimers, trimer and oligomers or mixtures thereof and copolymers thereof. Examples of monomers and copolymers thereof include unsaturated carboxylic acids (e.g., acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, etc.), esters and amides thereof, An ester of an unsaturated carboxylic acid and an aliphatic polyhydric alcohol compound, and an amide of an unsaturated carboxylic acid and an aliphatic polyvalent amine compound are used. Further, unsaturated carboxylic acid esters or unsaturated carboxylic acid amides having a nucleophilic substituent group such as a hydroxyl group, an amino group and a mercapto group, an addition reaction product of a monofunctional or polyfunctional isocyanate or an epoxy, A dehydration condensation reaction product of a functional carboxylic acid and the like is also preferably used. Further, an addition reaction product of an unsaturated carboxylic acid ester or an unsaturated carboxylic acid amide having an electrophilic substituent such as an isocyanate group or an epoxy group and monofunctional or polyfunctional alcohols, amines and thiols; Unsaturated carboxylic acid esters or unsaturated carboxylic acid amides having additionally a clearing substituent such as a halogen or a tosyloxy group and substitution reaction products with monofunctional or polyfunctional alcohols, amines and thiols are also preferable. As another example, it is also possible to use a compound group substituted by an unsaturated phosphonic acid, styrene, vinyl ether or the like in place of the unsaturated carboxylic acid. As specific compounds of these compounds, compounds described in paragraphs 0095 to 0108 of Japanese Patent Laid-Open Publication No. 2009-288705 can be preferably used in the present invention.

A first preferred form of the polymerizable compound is a monomer (polymerizable monomer) having at least one ethylenically unsaturated double bond or an oligomer (polymerizable oligomer) having a polymerizable group (hereinafter, the polymerizable monomer and the polymerizable oligomer are collectively referred to as & Gender monomer, etc. &quot;).

The polymerizable monomer or the like is also preferably a compound having an ethylenically unsaturated group having a boiling point of 100 占 폚 or higher at atmospheric pressure and having at least one addition polymerizable ethylene group. Examples thereof include monofunctional acrylates and methacrylates such as polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate and phenoxyethyl (meth) acrylate; (Meth) acrylates such as polyethylene glycol di (meth) acrylate, trimethylol ethane tri (meth) acrylate, neopentyl glycol di (meth) acrylate, pentaerythritol tri (Meth) acrylate, trimethylolpropane tri (acryloyloxypropyl) ether, tri (acryloyloxyethyl) isocyanurate, tripentaerythritol hexa (meth) acrylate, (Meta) acrylate obtained by adding ethylene oxide or propylene oxide to a polyfunctional alcohol such as glycerin or trimethylolethane, Japanese Patent Publication No. 48-41708, Japanese Patent Publication No. 50-6034, Japanese Patent Urethane (meth) acrylates as disclosed in JP-A-51-37193, JP-A-48-64183, JP-A-49-43191 , Polyfunctional acrylates and methacrylates such as epoxy acrylates, reaction products of epoxy polymer and (meth) acrylic acid, epoxy acrylates and the like, which are described in JP-A-52-30490, And mixtures thereof.

(Meth) acrylate obtained by reacting a polyfunctional carboxylic acid with a compound having a cyclic ether group such as glycidyl (meth) acrylate and an ethylenic unsaturated group.

Examples of other preferable polymerizable monomers include compounds having a fluorene ring described in JP-A-2010-160418, JP-A-2010-129825, JP-A-4364216, etc. and having two or more ethylenic polymerizable groups, It is also possible to use polymers.

Also, as the compound having at least one addition-polymerizable ethylenic unsaturated group having a boiling point of 100 캜 or more at normal pressure, the compounds described in paragraphs [0254] to [0257] of JP-A No. 2008-292970 are also preferable.

Further, in JP-A-10-62986, a compound obtained by adding ethylene oxide or propylene oxide to the polyfunctional alcohol described in the formulas (1) and (2) together with the specific examples thereof and then adding (meth) May also be used as polymerizable monomers.

The polymerizable monomer is also preferably a polymerizable monomer represented by the following formulas (MO-1) to (MO-6).

(Wherein n is 0 to 14 and m is 1 to 8. R, T and Z, which are present in a molecule in plural, may be the same or different, respectively.) When T is an oxyalkylene group, And the terminal is bonded to R. At least one of R is a polymerizable group)

n is preferably 0 to 5, more preferably 1 to 3.

m is preferably from 1 to 5, more preferably from 1 to 3.

R is

However,

Is more preferable.

Specific examples of the radically polymerizable monomers represented by the above formulas (MO-1) to (MO-6) include compounds described in paragraphs 0248 to 0251 of JP-A No. 2007-269779 Can be used.

Among them, dipentaerythritol triacrylate (KAYARAD D-330; Nippon Kayaku Co., Ltd.) and dipentaerythritol tetraacrylate (KAYARAD D-320; Nippon Kayaku Co., Ltd.) are commercially available as polymerizable monomers. (KAYARAD D-310 manufactured by Nippon Kayaku Co., Ltd.), dipentaerythritol hexa (methacrylate) (commercially available as KAYARAD DPHA; Nippon Kayaku Co., Ltd.), dipentaerythritol penta (Ethylene oxide) -modified (meth) acrylate (a product of M-460 (trade name) manufactured by Mitsubishi Chemical Corporation), and a structure in which these (meth) acryloyl groups are interposed between ethylene glycol and propylene glycol residues; diglycerin EO ; Toagosei Company, Limited). These oligomer types can also be used.

For example, RP-1040 (manufactured by Nippon Kayaku Co., Ltd.) and the like.

Polymerizable monomers and the like are polyfunctional monomers and may have an acid group such as a carboxyl group, a sulfonic acid group and a phosphoric acid group. Therefore, if the ethylenic compound has an unreacted carboxyl group as in the case of a mixture as described above, it can be used as it is. However, if necessary, a nonaromatic carboxylic acid anhydride may be added to the hydroxyl group of the above- And an acid group may be introduced by reaction. In this case, specific examples of the non-aromatic carboxylic acid anhydrides to be used include anhydrous tetrahydrophthalic acid, alkylated tetrahydrophthalic acid, anhydrous hexahydrophthalic acid, alkylated anhydrous hexahydrophthalic acid, succinic anhydride, and maleic anhydride.

The monomer having an acid group is preferably an ester of an aliphatic polyhydroxy compound and an unsaturated carboxylic acid and a polyfunctional monomer having an acid group by reacting an unreacted hydroxyl group of the aliphatic polyhydroxy compound with a nonaromatic carboxylic anhydride And particularly preferably, in the ester, the aliphatic polyhydroxy compound is pentaerythritol and / or dipentaerythritol. Commercially available products include, for example, M-305, M-510, and M-520 of Aronix series as polybasic acid-modified acrylic oligomers of Toagosei Company, Limited.

The preferable acid value of the polyfunctional monomer having an acid group is 0.1 to 40 mg-KOH / g, particularly preferably 5 to 30 mg-KOH / g. When two or more polyfunctional monomers having different acid groups are used in combination or when polyfunctional monomers having no acid group are used in combination, it is essential to prepare the polyfunctional monomers so that the total acid value of the polyfunctional monomer falls within the above range.

Further, as the polymerizable monomer or the like, it is preferable to contain a polyfunctional monomer having a caprolactone-modified structure.

The polyfunctional monomer having a caprolactone-modified structure is not particularly limited as long as it has a caprolactone-modified structure in its molecule, and examples thereof include trimethylolethane, ditrimethylolethane, trimethylolpropane, dimethylolpropane, pentaerythritol, di Caprolactone-modified polyfunctional (meth) acrylate obtained by esterifying a polyhydric alcohol such as pentaerythritol, tripentaerythritol, glycerin, diglycerol, trimethylol melamine and the like with (meth) acrylic acid and epsilon -caprolactone . Among them, a polyfunctional monomer having a caprolactone-modified structure represented by the following formula (1) is preferable.

(Wherein all six Rs are groups represented by the following formula (2), or one to five of the six Rs are groups represented by the following formula (2), and the remainder is a group represented by the following formula (3) Lt; / RTI &

(Wherein R ¹ represents a hydrogen atom or a methyl group, m represents a number of 1 or 2, and "*" represents a bonding bond)

(Wherein R &lt; ¹ &gt; represents a hydrogen atom or a methyl group, &quot; * &quot;

Such a polyfunctional monomer having a caprolactone-modified structure is commercially available, for example, as KAYARAD DPCA series from Nippon Kayaku Co., Ltd., and DPCA-20 (m = 1, equation (2) Radix = 2, represented by R ¹ are both the number = 3, R ¹ of the groups represented by the compound), DPCA-30 (the same formula, m = 1, equation (2) a hydrogen atom DPCA-60 (the compound represented by the formula, m = 1, the number of groups represented by the formula (2) = 6 and R ¹ are all hydrogen atoms), DPCA-120 = 2, the number of groups represented by the formula (2) = 6, and R ¹ are all hydrogen atoms).

The polyfunctional monomer having a caprolactone-modified structure may be used alone or in combination of two or more.

The polymerizable monomer or the like is preferably at least one member selected from the group of compounds represented by the following formula (i) or (ii).

The formula (i) and (ii) of E are each independently selected from _{- ((CH 2) yCH 2} O) - or _{- ((CH 2) y CH} (CH 3) O) - represents the, y are each independently And each X independently represents an acryloyl group, a methacryloyl group, a hydrogen atom or a carboxyl group.

In the formula (i), the sum of the acryloyl group and the methacryloyl group is 3 or 4, m is independently an integer of 0 to 10, and the sum of m is an integer of 0 to 40. Provided that when the sum of each m is 0, any one of X is a carboxyl group.

The sum of the acryloyl group and the methacryloyl group in the formula (ii) is 5 or 6, and each n independently represents an integer of 0 to 10, and the sum of n is an integer of 0 to 60. Provided that when the sum of each n is 0, any one of X is a carboxyl group.

In the above formula (i), m is preferably an integer of 0 to 6, more preferably an integer of 0 to 4. The sum of m is preferably an integer of 2 to 40, more preferably an integer of 2 to 16, and particularly preferably an integer of 4 to 8.

In the formula (ii), n is preferably an integer of 0 to 6, more preferably an integer of 0 to 4. The sum of each n is preferably an integer of 3 to 60, more preferably an integer of 3 to 24, and particularly preferably an integer of 6 to 12.

- ((CH ₂ ) _y CH ₂ O) - or - ((CH ₂ ) _y CH (CH ₃ ) O) - in the formula (i) or (ii) Is preferable.

The compounds represented by the above formula (i) or (ii) may be used singly or in combination of two or more. Particularly, in the formula (ii), all of the six X's are preferably acryloyl groups.

Among the compounds represented by the above formula (i) or (ii), pentaerythritol derivatives and / or dipentaerythritol derivatives are more preferable.

Specifically, the compounds represented by the following formulas (a) to (f) (hereinafter also referred to as "exemplified compounds (a) to (f)") (e) and (f) are preferable.

Examples of commercially available products such as polymerizable monomers represented by formulas (i) and (ii) include SR-494, Nippon Kayaku Co., Ltd., which is a tetrafunctional acrylate having four ethyleneoxy chains of Sartomer Company. DPCA-60, which is a hexafunctional acrylate having six pentylene oxy chains, and TPA-330, which is a trifunctional acrylate having three isobutyleneoxy chains, are listed.

Examples of polymerizable monomers include urethane acrylates described in Japanese Patent Publication Nos. 48-41708, 51-37193, 2-32293 and 2-16765, , Urethane compounds having an ethylene oxide skeleton described in Japanese Patent Publication Nos. 58-49860, 56-17654, 62-39417 and 62-39418 are also preferable. As polymerizable monomers and the like, addition polymerizable compounds having an amino structure or a sulfide structure in a molecule described in Japanese Patent Application Laid-Open Nos. 63-277653, 63-260909, and 1-105238 By using monomers, a curable composition having a very high photosensitive speed can be obtained.

UA-7200 "(manufactured by Shin-nakamura Chemical Co., Ltd., DPHA-40H (manufactured by Nippon Kayaku Co., Ltd.) (Manufactured by Kyoeisha Co., Ltd.), UA-306H, UA-306T, UA-306I, AH-600, T-600 and AI-600.

As the polymerizable monomer or the like, a polyfunctional thiol compound having two or more mercapto (SH) groups in the same molecule is also preferable. Particularly, those represented by the following formula (I) are preferable.

(Wherein R ¹ represents an alkyl group, R ² represents an n-valent aliphatic group which may contain atoms other than carbon, R ⁰ represents an alkyl group other than H, and n represents an integer of 2 to 4)

Specific examples of the polyfunctional thiol compound represented by the formula (I) include 1,4-bis (3-mercaptobutyryloxy) butane having the following structural formula (formula (II) -Tris (3-mercaptobutyloxyethyl) -1,3,5-triadien-2,4,6 (1H, 3H5H) -trione [formula (III)] and pentaerythritol tetrakis Butyrate) [formula (IV)]. These polyfunctional thiols may be used singly or in combination.

In the present invention, as the polymerizable monomer or the like, it is also preferable to use a polymerizable monomer or oligomer having two or more epoxy groups or oxetanyl groups in the molecule.

<< C: Compound having an epoxy group or an oxetanyl group >>

In a third preferred embodiment of the present invention, as the polymerizable compound, a compound having an epoxy group or an oxetanyl group may be used. Specific examples of the compound having an epoxy group or an oxetanyl group include a polymer having an epoxy group in the side chain and a polymerizable monomer or oligomer having two or more epoxy groups in the molecule, and examples thereof include a bisphenol A type epoxy resin, a bisphenol F type epoxy resin, Type epoxy resin, cresol novolak type epoxy resin, aliphatic epoxy resin, and the like.

These compounds may be commercially available products or may be obtained by introducing an epoxy group into the side chain of the polymer.

As commercial products, for example, bisphenol A type epoxy resins include JER827, JER828, JER834, JER1001, JER1002, JER1003, JER1055, JER1007, JER1009, JER1010 (manufactured by Japan Epoxy Resins Co., Ltd.), EPICLON860, EPICLON1050, EPICLON1051, (Manufactured by Japan Epoxy Resins Co., Ltd.), EPICLO N830, EPICLO N83 (manufactured by DIC Corporation), etc., and bisphenol F type epoxy resins such as JER806, JER807, JER4004, JER4005, JER4007, JER4010 JER152, JER157S70, and JER157S65 (manufactured by Japan Epoxy Resins Co., Ltd.) as the phenol novolak type epoxy resin. EPICLON N-760, EPICLON N-770, EPICLON N-775 (manufactured by DIC Corporation)) and EPICLON N-660, EPICLON N-775 670, EPICLON N-670, EPICLON N-670, EPICLON N-670, EPICLON N-670, (Manufactured by Nippon Kayaku Co., Ltd.), and examples of the aliphatic epoxy resin include ADEKA RESIN EP-4080S, EP-4085S and EP-4088S (manufactured by ADEKA CORPORATION), Celloxide 2021P, Celloxide 2081, Celloxide 2083 (Manufactured by Nagase Chemtex Corporation, Daicel Corporation), Denacol EX-212L, EX-214L, EX-216L, EX-321L and EX-850L ). In addition, ADEKA RESIN EP-4000S, EP-4003S, EP-4010S, EP-4011S (above, ADEKA CORPORATION products), NC-2000, NC-3000, NC-7300, XD- , EPPN-502 (manufactured by ADEKA CORPORATION), and JER1031S (manufactured by Japan Epoxy Resins Co., Ltd.).

Specific examples of the polymer having an oxetanyl group in the side chain and the polymerizable monomer or oligomer having at least two oxetanyl groups in the molecule include alonoxetane OXT-121, OXT-221, OX-SQ and PNOX , Limited) can be used.

In the case of synthesizing by introduction into the polymer side chain, the introduction reaction may be carried out by using a tertiary amine such as triethylamine or benzylmethylamine, a quaternary ammonium salt such as dodecyltrimethylammonium chloride, tetramethylammonium chloride or tetraethylammonium chloride, , Triphenylphosphine or the like as a catalyst in an organic solvent at a reaction temperature of 50 to 150 DEG C for several to several tens of hours. The introduction amount of the alicyclic epoxy unsaturated compound is preferably controlled so that the acid value of the obtained polymer is in the range satisfying 5 to 200 KOH mg / g. The weight average molecular weight is preferably in the range of 500 to 5,000,000, or 1000 to 500,000.

As the epoxy unsaturated compound, those having a glycidyl group as an epoxy group such as glycidyl (meth) acrylate or allyl glycidyl ether can also be used, but an unsaturated compound having an alicyclic epoxy group is preferable. As such examples, the following compounds can be exemplified.

Specific examples of the monomer of the amide of the aliphatic polyvalent amine compound and the unsaturated carboxylic acid include methylene bis-acrylamide, methylene bis-methacrylamide, 1,6-hexamethylene bis-acrylamide, Methacrylamide, diethylenetriamintris acrylamide, xylylene bisacrylamide, xylylene bismethacrylamide, and the like.

Examples of other preferable amide-based monomers include those having a cyclohexylene structure disclosed in Japanese Patent Publication No. 54-21726.

Also, a urethane-based addition polymerizable compound produced by the addition reaction of isocyanate and hydroxyl group is also preferable. As specific examples thereof, two or more isocyanate groups in a molecule described in Japanese Patent Publication No. 48-41708 And a vinyl urethane compound having two or more polymerizable vinyl groups in one molecule, which is represented by the following formula (V) and is obtained by adding a vinyl monomer having a hydroxyl group to the polyisocyanate compound.

In the following formula (V), R ⁷ and R ⁸ each independently represent a hydrogen atom or a methyl group.

H ₂ C = CR ⁷ COOCH ₂ CH (R ⁸ ) OH ????? (V)

Also, urethane acrylates described in JP-A-51-37193, JP-A-2-32293, JP-A-2-16765, JP-A-58-49860, JP-B-56-17654, JP-A-62-39417, and JP-A-62-39418, which are also preferred, are urethane compounds having an ethylene oxide skeleton. In addition, polymeric compounds having an amino structure or a sulfide structure in the molecule described in JP-A-63-277653, JP-A-63-260909 and JP-A-1-105238 A curable composition having an extremely excellent photosensitive speed can be obtained.

Other examples include polyester acrylates, epoxy resins and (meth) acrylates as described in Japanese Patent Application Laid-Open No. 48-64183, Japanese Patent Publication No. 49-43191, Japanese Patent Publication No. 52-30490, And polyfunctional acrylates and methacrylates such as epoxy acrylates obtained by reacting acrylic acid. Specific unsaturated compounds described in JP-A-46-43946, JP-A-1-40337, JP-A-1-40336, and vinyl compounds disclosed in JP-A-2-25493 Phosphonic acid-based compounds and the like. In addition, in some cases, a structure containing a perfluoroalkyl group described in JP-A-61-22048 is preferably used. Also, 20, No. 7, pages 300 to 308 (1984), can also be used.

Details of the structure, the use of the polymerizable compound, the use alone, the combination thereof, and the amount thereof to be added can be arbitrarily set according to the final performance design of the curable composition. For example, it is selected from the following viewpoints.

From the viewpoint of sensitivity, a structure having a large amount of unsaturated groups per molecule is preferable, and in many cases, a bifunctionality or higher is preferable. Further, in order to increase the strength of the cured film, it is preferable to use a trifunctional or higher functional group, and it is also possible to use other functional groups and other polymerizable groups (e.g., acrylic acid ester, methacrylic acid ester, styrene compound, vinyl ether compound, A ternary compound) may be used in combination to control both the sensitivity and the strength.

In addition, regarding the compatibility and dispersibility with other components (for example, polymerization initiator, metal oxide particles, etc.) contained in the curable composition, selection and use of polymerizable compounds are important factors. For example, Or the combination of two or more different components may improve the compatibility. In addition, a specific structure may be selected for the purpose of improving adhesion with a hard surface such as a substrate.

The content of the polymerizable compound (D) in the total solid content of the curable composition for forming a high refractive index layer is preferably in the range of 1% by mass to 50% by mass, more preferably in the range of 3% by mass to 40% , And still more preferably from 5% by mass to 30% by mass.

Within this range, it is preferable that the refractive index is not lowered and the curability is good.

(E) Polymerization initiator

The polymerization initiator (E) is a compound which initiates and accelerates the polymerization of the polymerizable compound (D) and is stable up to 45 캜, but preferably has good polymerization initiating ability upon heating at a high temperature.

The polymerization initiator preferably contains at least one compound having a molecular extinction coefficient of at least about 50 within a range of about 300 nm to 800 nm (more preferably, 330 nm to 500 nm).

The polymerization initiator may be used alone or in combination of two or more.

Examples of the polymerization initiator (E) include organic halogenated compounds, oxydiazole compounds, carbonyl compounds, ketal compounds, benzoin compounds, acridine compounds, organic peroxide compounds, azo compounds, coumarin compounds, A hexaarylbimidazole compound, an organic boric acid compound, a disulfonic acid compound, an oxime ester compound, an onium salt compound, and an acylphosphine (oxide) compound.

As a specific example of these, it is possible to consider the following description of Japanese Patent Application Laid-Open No. 2010-106268 (corresponding to [0163] of US Patent Application Publication No. 2011/0124824) Are included in the specification.

As the polymerization initiator, a hydroxyacetophenone compound, an aminoacetophenone compound and an acylphosphine compound can also be preferably used. More specifically, for example, the aminoacetophenone-based initiator described in JP-A-10-291969 and the acylphosphine oxide-based initiator disclosed in JP-A-4225898 can be used.

As the hydroxyacetophenone-based initiator, IRGACURE-184, DAROCUR-1173, IRGACURE-500, IRGACURE-2959 and IRGACURE-127 (all trade names, manufactured by BASF) can be used.

As the aminoacetophenone-based initiator, commercially available products IRGACURE-907, IRGACURE-369 and IRGACURE-379 (all trade names, all manufactured by BASF) can be used. As the aminoacetophenone-based initiator, a compound described in JP-A-2009-191179 in which the absorption wavelength is matched to a long-wavelength light source such as 365 nm or 405 nm can be used.

Commercially available acylphosphine initiators include IRGACURE-819, DAROCUR-4265 and DAROCUR-TPO (trade names, all manufactured by BASF).

As the polymerization initiator (E), an oxime compound is preferable from the viewpoints of hardenability, stability with time, and difficulty of coloration upon post heating.

As the oxime compounds, there can be mentioned, for example, J.C.S. Perkin II (1979) 1653-1660, J.C.S. Perkin II (1979) 156-162, Journal of Photopolymer Science and Technology (1995) 202-232, Journal of Applied Polymer Science (2012) 725-731, JP-A 2000-66385, JP-A 2000-80068, and JP-A 2004-534797.

As the oxime ester compounds other than the above-described materials, compounds described in Japanese Patent Publication No. 2009-519904 in which oxime is linked to the carbazole N position, compounds described in U.S. Patent No. 7626957 in which a hetero substituent is introduced into a benzophenone moiety, The compounds described in JP-A-2010-15025 and US-2009-292039 wherein a nitro group is introduced at the site, the ketoxime compound described in WO 2009-131189, triazine skeleton and oxime skeleton in the same molecule , Compounds described in Japanese Patent Application Laid-Open No. 2009-221114 having a maximum absorption at 405 nm and good sensitivity to a linear light source, or the like may be used.

Also, the cyclic oxime compounds described in JP-A-2007-231000 and JP-A-2007-322744 can be preferably used. Among the cyclic oxime compounds, cyclic oxime compounds which are coordinated to carbazole dyes described in JP-A-2010-32985 and JP-A-2010-185072 are preferable from the viewpoint of high light absorption and high sensitivity.

The compounds described in JP-A-2009-242469 having an unsaturated bond in a specific part of the oxime compound can also be preferably used because they can attain high sensitivity by regenerating active radicals from polymerization inert radicals.

Other oxime compounds having specific substituent groups as disclosed in JP-A-2007-269779 and oxime compounds having thioaryl groups as disclosed in JP-A-2009-191061 are listed.

The oxime compound to be a polymerization initiator is preferably represented by the following formula (OX).

In the formula (OX), R and B have the same meanings as in the formula (OX-1). It is preferable that A ¹ is -AC of the formula (OX-1) or an alkyl group. The alkyl group preferably has 1 to 12 carbon atoms, more preferably 1 to 6 carbon atoms.

· C

C represents SAr or COAr.

R

R is a monovalent substituent and is preferably a monovalent nonmetal atomic group. Examples of the monovalent non-metallic atomic group include an alkyl group, an aryl group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a heterocyclic group, an alkylthiocarbonyl group, and an arylthiocarbonyl group. These groups may have one or more substituents. The above-mentioned substituent may be substituted with another substituent O. Examples of the substituent O include a halogen atom, an aryloxy group, an alkoxycarbonyl group or an aryloxycarbonyl group, an acyloxy group, an acyl group, an alkyl group, and an aryl group. The substituent O may be substituted with any linking group L (alkylene group having 1 to 6 carbon atoms, O, S, CO, NR ^N, or a combination thereof: R ^N is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms).

· B

B represents a monovalent substituent, and includes an alkyl group (preferably having 1 to 12 carbon atoms), an aryl group (preferably having 6 to 14 carbon atoms, more preferably having 6 to 10 carbon atoms), a heterocyclic group (Preferably having from 7 to 15 carbon atoms, more preferably from 7 to 11 carbon atoms) or a heterocyclic carbonyl group (preferably having from 3 to 19 carbon atoms, more preferably from 2 to 18 carbon atoms, and still more preferably from 2 to 12 carbon atoms) More preferably 3 to 13 carbon atoms). These groups may be bonded through a linking group L. These groups may have at least one substituent O. The substituent O may be substituted through any linking group L.

A

A is a single bond or a linking group. Preferable examples of the linking group include a linking group L or an arylene group (preferably 6 to 14, more preferably 6 to 10 carbon atoms) or a heterocyclic linking group (preferably an aromatic heterocyclic linking group) More preferably 2 to 12 carbon atoms).

· Ar

Ar is an aryl group or a heteroaryl group (aromatic heterocyclic group). The aryl group is preferably 6 to 14, more preferably 6 to 10 carbon atoms, and a phenyl group or a naphthyl group is preferable. The heteroaryl group is preferably a carbazolyl group having 2 to 18 carbon atoms, more preferably 2 to 12 carbon atoms, which may have a substituent such as an alkyl group at the N position.

(OX-1), (OX-2) or (OX-3) following the Japanese Patent Application Laid-Open Publication No. 2012-208494 (corresponding to US Patent Application Publication No. 2012/235099 [0632] ), And the contents of these compounds are included in the specification of the present invention.

Specific examples of the oxime compounds (PIox-1) to (PIox-13) which are preferably used below are shown below, but the present invention is not limited thereto.

The oxime compound has a function as a thermal polymerization initiator which is decomposed by heat to initiate and accelerate polymerization. Particularly, the oxime compound represented by the formula (a) is less colored in post heating and has good curability.

The oxime compound preferably has a maximum absorption wavelength in the wavelength region of 350 nm to 500 nm, more preferably has the absorption wavelength in the wavelength region of 360 nm to 480 nm, and particularly preferably has high absorbance at 365 nm and 455 nm.

From the viewpoint of sensitivity, the oxime compound preferably has a molar extinction coefficient at 365 nm or 405 nm of 1,000 to 300,000, more preferably 2,000 to 300,000, and particularly preferably 5,000 to 200,000. The molar extinction coefficient of the compound can be measured by a known method. Specifically, the molar extinction coefficient of the compound can be measured, for example, by using an ethyl acetate solvent with a spectrophotometer (Carry-5 spectrophotometer manufactured by Varian) .

As the oxime compounds, commercially available products such as IRGACURE OXE01 and IRGACURE OXE02 (all manufactured by BASF) can be preferably used.

As the polymerization initiator (E), from the viewpoint of curability, trihalomethyltriazine compounds, benzyldimethylketal compounds,? -Hydroxyketone compounds,? -Amino ketone compounds, acylphosphine compounds, phosphine oxide compounds, A benzophenone compound, an acetophenone compound and a derivative thereof, a cyclopentadiene-benzene-iron complex and a salt thereof, a halomethyl compound, an oxime compound, a triarylimidazole dimer, an onium compound, a benzothiazole compound, An oxadiazole compound, and a 3-aryl substituted coumarin compound.

(The total content in the case of two or more kinds) of the (E) polymerization initiator is preferably not less than 0.1% by mass and not more than 10% by mass, more preferably not less than 0.3% by mass and not more than 8% by mass relative to the total solid content of the curable composition, And preferably 0.5% by mass or more and 5% by mass or less. Within this range, good curability is obtained.

Further, if necessary, the above-mentioned optional components may be further contained.

[Polymerization inhibitor]

It is preferable to add a polymerization inhibitor in order to prevent the unnecessary polymerization of the compound having a polymerizable ethylenically unsaturated double bond during or during the production.

Examples of the polymerization inhibitor include phenolic hydroxyl group-containing compounds, N-oxide compounds, piperidine 1-oxyl free radical compounds, pyrrolidine 1-oxyl free radical compounds, N-nitrosophenylhydroxylamines, Compounds and cationic dyes, sulfide group-containing compounds, nitro group-containing compounds, transition metal compounds such as FeCl ₃ and CuCl ₂ . Specific examples of the polymerization inhibitor include those described in Japanese Patent Application Laid-Open No. 2010-106268, paragraphs 0260 to 0280 (corresponding to United States Patent Application Publication No. 2011/0124824 [0284] to [0296]), The contents of which are incorporated herein by reference.

The amount of the polymerization inhibitor to be added is preferably 0.01 parts by mass or more and 10 parts by mass or less, more preferably 0.01 parts by mass or more and 8 parts by mass or less, more preferably 0.05 parts by mass or more and 5 parts by mass or less Most preferably in the range of &lt; RTI ID = 0.0 &gt;

By setting the above range, the curing reaction in the non-image portion is suppressed and the curing reaction in the image portion is sufficiently promoted, so that the image forming property and sensitivity become good.

[Binder polymer]

The dispersion composition of the present embodiment preferably further comprises a binder polymer.

As the binder polymer, it is preferable to use a linear organic polymer. As such a linear organic polymer, any known one may be used. Preferably linear organic polymers that are soluble or swellable in water or weak alkaline water are selected to enable water development or weak alkaline development. The linear organic polymer is selected not only as a film-forming agent, but also as a water, weakly alkaline water or organic solvent developer. For example, water-soluble organic polymers enable water development. Examples of such linear organic polymers include radical polymers having a carboxylic acid group in the side chain, for example, Japanese Patent Application Laid-open No. 59-44615, Japanese Patent Publication No. 54-34327, Japanese Patent Publication No. 58-12577, Those described in JP-B-54-25957, JP-A-54-92723, JP-A-59-53836 and JP-A-59-71048, that is, a monomer having a carboxyl group A resin obtained by subjecting an epoxy resin to an unsaturated monocarboxylic acid or an acid anhydride or a resin obtained by subjecting an acid anhydride unit to hydrolysis or half esterification or half amidation, Rate, and the like. Examples of the monomer having a carboxyl group include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, and 4-carboxystyrene. Monomers having an acid anhydride include maleic anhydride.

Similarly, there is an acidic cellulose derivative having a carboxylic acid group in the side chain. In addition, it is useful that a cyclic acid anhydride is added to a polymer having a hydroxyl group.

When a copolymer is used as the binder polymer, a monomer other than the above-described monomer may be used as a copolymerizing compound. Examples of other monomers include the following compounds (1) to (12).

(1) a polyfunctional monomer selected from the group consisting of 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 3-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, 2-hydroxyethyl methacrylate, Acrylate esters and methacrylate esters having aliphatic hydroxyl groups such as acrylate, 3-hydroxypropyl methacrylate and 4-hydroxybutyl methacrylate.

(2) acrylic acid esters such as methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, isobutyl acrylate, amyl acrylate, hexyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, benzyl acrylate, Acrylate such as vinyl acrylate, 2-phenylvinyl acrylate, 1-propenyl acrylate, allyl acrylate, 2-aryloxyethyl acrylate, propargyl acrylate and the like such as 3,4-epoxycyclohexylmethyl acrylate, Late.

(3) a polyfunctional monomer selected from the group consisting of methylmethacrylate, ethylmethacrylate, propylmethacrylate, butylmethacrylate, isobutylmethacrylate, amylmethacrylate, hexylmethacrylate, 2-ethylhexylmethacrylate, methacrylic acid Cyclohexyl methacrylate, benzyl methacrylate, 2-chloroethyl methacrylate, glycidyl methacrylate, 3,4-epoxycyclohexylmethyl methacrylate, vinyl methacrylate, 2-phenylvinyl methacrylate, 1 - alkyl methacrylates such as propenyl methacrylate, allyl methacrylate, 2-aryloxyethyl methacrylate and propargyl methacrylate.

(4) A method for producing a polymer comprising the steps of: (1) polymerizing an acrylamide, a methacrylamide, N-methylol acrylamide, N-ethyl acrylamide, N-hexylmethacrylamide, N-cyclohexyl acrylamide, N- , N-nitrophenylacrylamide, N-ethyl-N-phenyl acrylamide, vinyl acrylamide, vinyl methacrylamide, N, N-diallylacrylamide, N, N-diallylmethacrylamide, Acrylamide or methacrylamide such as allyl methacrylamide.

(5) Vinyl ethers such as ethyl vinyl ether, 2-chloroethyl vinyl ether, hydroxyethyl vinyl ether, propyl vinyl ether, butyl vinyl ether, octyl vinyl ether and phenyl vinyl ether.

(6) Vinyl esters such as vinyl acetate, vinyl chloroacetate, vinyl butyrate and vinyl benzoate.

(7) styrenes such as styrene,? -Methylstyrene, methylstyrene, chloromethylstyrene, and p-acetoxystyrene.

(8) Vinyl ketones such as methyl vinyl ketone, ethyl vinyl ketone, propyl vinyl ketone, and phenyl vinyl ketone.

(9) Olefins such as ethylene, propylene, isobutylene, butadiene and isoprene.

(10) N-vinylpyrrolidone, acrylonitrile, methacrylonitrile, and the like.

(11) Unsaturated imides such as maleimide, N-acryloyl acrylamide, N-acetyl methacrylamide, N-propionyl methacrylamide and N- (p-chlorobenzoyl) methacrylamide.

(12) A methacrylic acid-based monomer having a hetero atom bonded to the? -Position. For example, the compounds described in the respective publications such as Japanese Patent Application Laid-Open No. 2002-309057 and Japanese Patent Application Laid-Open No. 2002-311569 can be mentioned.

It is also preferable that the binder polymer includes a repeating unit obtained by polymerizing a monomer component essentially comprising a compound represented by the following formula (ED) (hereinafter sometimes referred to as "ether dimer").

(In the formula (ED), R ₁ and R ₂ each independently represent a hydrogen atom or a hydrocarbon group having 1 to 25 carbon atoms which may have a substituent.)

As a result, the curable composition for forming a high refractive index layer of the present embodiment can form a cured coating film having excellent heat resistance and transparency. The hydrocarbon group having 1 to 25 carbon atoms which may have a substituent represented by R ₁ and R ₂ in the formula (ED) represented by the ether dimer is not particularly limited and includes, for example, a linear or branched alkyl group; An aryl group; Cyclohexyl, t-butylcyclohexyl, dicyclopentadienyl, tricyclodecanyl, isobornyl, adamantyl, 2-methyl-2-adamantyl and the like; An alkyl group substituted with alkoxy; An alkyl group substituted with an aryl group such as benzyl; . Among these, an acid such as methyl, ethyl, cyclohexyl, benzyl and the like and a substituent of a primary or secondary carbon which is difficult to desorb by heat are preferable from the viewpoint of heat resistance.

Specific examples of the ether dimer include the examples of the ether dimer described in paragraph [0565] of Japanese Patent Application Laid-Open Publication No. 2012-208494 (corresponding to [0694] of U.S. Patent Application Publication No. 2012/235099), the contents of which are incorporated herein by reference .

Specific examples of the ether dimer include dimethyl-2,2'- [oxybis (methylene)] bis-2-propanoate, diethyl-2,2 '- [oxybis (methylene)] bis- Dicyclohexyl-2,2 '- [oxybis (methylene)] bis-2-propanoate and dibenzyl-2,2' - [oxybis (methylene)] bis-2-propanoate are preferable. These ether dimers may be used alone or two or more thereof may be used. Further, the structure derived from the compound represented by the formula (ED) may be copolymerized with other monomers.

Examples of other monomers copolymerizable with the ether dimer include monomers for introducing an acid group, monomers for introducing radically polymerizable double bonds, monomers for introducing an epoxy group, and copolymerizable monomers other than the above, do. These monomers may be used alone, or two or more monomers may be used.

Examples of the monomer for introducing an acid group include monomers having a carboxyl group such as (meth) acrylic acid and itaconic acid, monomers having a phenolic hydroxyl group such as N-hydroxyphenylmaleimide, monomers having maleic anhydride and itaconic anhydride Monomers having a carboxylic acid anhydride group, and the like. Among these, (meth) acrylic acid is particularly preferable.

The monomer for introducing an acid group may be a monomer capable of imparting an acid group after polymerization. Examples thereof include monomers having a hydroxyl group such as 2-hydroxyethyl (meth) acrylate, glycidyl (meth) acrylate , Monomers having an isocyanate group such as 2-isocyanate ethyl (meth) acrylate, and the like. In the case of using a monomer for introducing a radical polymerizable double bond, in the case of using a monomer capable of giving an acid group after polymerization, it is necessary to carry out a treatment to give an acid group after polymerization. The treatment for imparting an acid group after polymerization varies depending on the type of monomer, and for example, the following treatments are listed. When a monomer having a hydroxyl group is used, for example, there is enumerated a treatment for adding an acid anhydride such as succinic anhydride, tetrahydrophthalic anhydride, maleic anhydride or the like. When a monomer having an epoxy group is used, for example, a compound having an acid group and an amino group such as N-methylaminobenzoic acid or N-methylaminophenol is added, or an acid such as (meth) acrylic acid is added And a step of adding an acid anhydride such as succinic anhydride, tetrahydrophthalic anhydride or maleic anhydride to the resulting hydroxyl group. When a monomer having an isocyanate group is used, for example, a treatment for adding a compound having a hydroxyl group and an acid group, such as 2-hydroxybutyric acid, is added.

When the polymer obtained by polymerizing the monomer component containing a compound represented by the formula (ED) contains a monomer for introducing an acid group, the content thereof is not particularly limited, but 5 to 70 mass% , And more preferably from 10 to 60 mass%.

Examples of the monomer for introducing the radical polymerizable double bond include monomers having a carboxyl group such as (meth) acrylic acid and itaconic acid; Monomers having a carboxylic anhydride group such as maleic anhydride and itaconic anhydride; Monomers having an epoxy group such as glycidyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate and o- (or m- or p-) vinylbenzyl glycidyl ether. When a monomer for introducing a radically polymerizable double bond is used, it is necessary to perform a treatment for imparting a radically polymerizable double bond after polymerization. The treatment for imparting a radically polymerizable double bond after polymerization varies depending on the kinds of monomers capable of imparting a radically polymerizable double bond to be used, and includes, for example, the following treatments. (Meth) acrylic acid or itaconic acid is used, glycidyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, o- (or m- or p- ) Vinyl benzyl glycidyl ether and the like, and a process of adding a compound having a radically polymerizable double bond to an epoxy group. In the case of using a monomer having a carboxylic acid anhydride group such as maleic anhydride or itaconic anhydride, there is enumerated a treatment for adding a compound having a radically polymerizable double bond and a hydroxyl group such as 2-hydroxyethyl (meth) acrylate . When a monomer having an epoxy group such as glycidyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate or o- (or m- or p-) vinylbenzyl glycidyl ether is used, (Meth) acrylic acid or the like and a compound having a radically polymerizable double bond are added.

When the polymer obtained by polymerizing a monomer component containing a compound represented by the formula (ED) contains a monomer for introducing a radically polymerizable double bond, the content thereof is not particularly limited, Is preferably 70% by mass, more preferably 10% to 60% by mass.

Examples of the monomer for introducing an epoxy group include glycidyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, o- (or m- or p-) vinylbenzyl glycidyl ether .

When the polymer obtained by polymerizing the monomer component containing a compound represented by the formula (ED) contains a monomer for introducing an epoxy group, the content thereof is not particularly limited, but it is preferably 5 to 70 mass% , And more preferably from 10 to 60 mass%.

Examples of other copolymerizable monomers include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (Meth) acrylates such as t-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, cyclohexyl (meth) acrylate, benzyl (meth) acrylate and 2-hydroxyethyl (meth) acrylate; Aromatic vinyl compounds such as styrene, vinyltoluene, and? -Methylstyrene; N-substituted maleimides such as N-phenylmaleimide and N-cyclohexylmaleimide; Butadiene or substituted butadiene compounds such as butadiene and isoprene; Ethylene or substituted ethylene compounds such as ethylene, propylene, vinyl chloride and acrylonitrile; Vinyl esters such as vinyl acetate; . Among these, methyl (meth) acrylate, cyclohexyl (meth) acrylate, benzyl (meth) acrylate and styrene are preferred because they are excellent in transparency and hardly deteriorate heat resistance.

When the polymer obtained by polymerizing the monomer component containing a compound represented by the formula (ED) contains other copolymerizable monomers, the content thereof is not particularly limited, but is preferably 95% by mass or less, more preferably 85% Is more preferable.

The weight average molecular weight of the polymer obtained by polymerizing a monomer component containing a compound represented by the formula (ED) is not particularly limited, but from the viewpoints of the viscosity of the coloring and radiation-sensitive composition and the heat resistance of the coating film formed by the composition, Is preferably from 2,000 to 200,000, more preferably from 5,000 to 100,000, and still more preferably from 5,000 to 20,000.

When the polymer obtained by polymerizing the monomer component containing a compound represented by the formula (ED) has an acid group, the acid value is preferably 30 to 500 mgKOH / g, more preferably 50 to 400 mgKOH / g.

A polymer obtained by polymerizing a monomer component containing a compound represented by the formula (ED) can be easily obtained by polymerizing at least the above monomer having an ether dimer as an essential component. At this time, the cyclization reaction of the ether dimer proceeds simultaneously with the polymerization to form a tetrahydropyran ring structure.

The polymerization method applied to the synthesis of the polymer obtained by polymerizing the monomer component containing the compound represented by the formula (ED) is not particularly limited and various conventionally known polymerization methods can be employed. In particular, . Specifically, for example, a polymer obtained by polymerizing a monomer component containing a compound represented by the formula (ED) is synthesized in accordance with the synthesis method of the polymer (a) described in JP-A-204-300204 .

Hereinafter, an exemplary compound of a polymer obtained by polymerizing a monomer component containing a compound represented by the formula (ED) is shown, but the present invention is not limited thereto. The composition ratio of the exemplified compounds shown below is in mol%.

(Hereinafter referred to as "DM"), benzyl methacrylate (hereinafter referred to as "BzMA"), meta-2,2'- [oxybis (methylene)] bis- A polymer obtained by copolymerizing methyl acrylate (hereinafter referred to as "MMA"), methacrylic acid (hereinafter referred to as "MAA") and glycidyl methacrylate (hereinafter referred to as "GMA") is preferable. In particular, the molar ratio of DM: BzMA: MMA: MAA: GMA is preferably 5:15:40 to 50: 5 to 15: 5 to 15:20 to 30. It is preferable that 95% by mass or more of the components constituting the copolymer used in the present invention is a component thereof. The weight average molecular weight of such a polymer is preferably 9,000 to 20,000.

Polymer used in the present invention, and more preferably a weight average molecular weight (a polystyrene conversion value measured by GPC method) 1,000~2 × 10 ⁵ is preferable, ^{and, 2,000~1 × 10 5, 5,000~5 ×} 10 4 Is more preferable.

Among them, a (meth) acrylic resin having an allyl group, a vinyl ester group and a carboxyl group in its side chain, an alkali-soluble resin having a double bond in the side chain described in Japanese Patent Application Laid-Open Nos. 2000-187322 and 2002-62698 , And alkali-soluble resins having an amide group in the side chain described in JP-A-2001-242612 are preferable because of excellent balance among the film strength, sensitivity and developability. Examples of the above polymer include Dianal NR series (manufactured by Mitsubishi Rayon Co., Ltd.), Photomer 6173 (polyurethane acrylic oligomer containing COOH, manufactured by Diamond Shamrock Co. Ltd.), Viscot R-264, KS resist 106 OSAKA ORGANIC CHEMICAL INDUSTRY LTD.), Cyclamer P series such as cyclamer P ACA230AA, Fraxel CF200 series (all manufactured by Daicel Corporation) and Ebecryl 3800 (manufactured by Daicel UCB).

In addition, Japanese Patent Application Laid-Open Nos. 7-12004, 7-120041, 7-120042, 8-12424, 63-287944 A urethane-based binder polymer containing an acid group described in JP-A-63-287947 and JP-A-1-271741, and an acid group and a double bond described in JP-A-2002-107918 are added to side chains Is advantageous in terms of film strength because it has a very high strength.

The acetal-modified polyvinyl alcohol-based binder polymer having an acid group described in European Patent No. 993966, European Patent No. 1204000, Japanese Patent Laid-Open No. 2001-318463, etc. is also preferable because of its excellent film strength.

As other water soluble linear organic polymers, polyvinyl pyrrolidone, polyethylene oxide and the like are useful. Further, alcohol-soluble nylon, polyether of 2,2-bis- (4-hydroxyphenyl) -propane and epichlorohydrin, etc. are also useful for increasing the strength of the cured coating.

The weight average molecular weight of the binder polymer (polystyrene reduced value measured by the GPC method) is preferably 5,000 or more, more preferably in the range of 10,000 to 300,000, and more preferably 1,000 or more in terms of the number average molecular weight, And more preferably from 2,000 to 250,000. The polydispersity (weight average molecular weight / number average molecular weight) is preferably 1 or more, and more preferably 1.1 or more and 10 or less.

These binder polymers may be any of random polymers, block polymers, graft polymers, and the like.

The concentration of the binder polymer is preferably 1% by mass or more and 40% by mass or less, more preferably 3% by mass or more and 30% by mass or less, and still more preferably 4% by mass or more and 20% by mass or less with respect to the total solid content.

[Surfactants]

To the dispersion composition (I) of the present embodiment, various surfactants may be added. As the surfactant, various surfactants such as a fluorine surfactant, a nonionic surfactant, a cationic surfactant, an anionic surfactant, and a silicone surfactant can be used. In particular, the use of a fluorine-based surfactant is preferred. As specific examples of the surfactant, those described above in connection with the resin composition for forming a low refractive index film may be used, and only one type may be used, or two or more types may be used in combination. The fluorine content in the fluorine surfactant is preferably 3% by mass to 40% by mass, more preferably 5% by mass to 30% by mass, and particularly preferably 7% by mass to 25% by mass. The fluorine-containing surfactant having a fluorine content within this range is effective from the viewpoints of the uniformity of the thickness of the coating film and the liquid-saving property, and the solubility is also good.

The addition amount of the surfactant in the dispersion composition is preferably from 0.001 mass% to 2.0 mass%, more preferably from 0.005 mass% to 1.0 mass%, based on the total mass of the curable composition.

[Other additives]

Further, known additives such as a plasticizer and a sensitizer may be added to the dispersion composition.

Examples of the plasticizer include dioctyl phthalate, didodecyl phthalate, triethylene glycol dicaprylate, dimethyl glycol phthalate, tricresyl phosphate, dioctyl adipate, dibutyl sebacate, triacetyl glycerin, and the like. When it is used, it may be added in an amount of 10% by mass or less based on the total mass of the polymerizable compound and the binder polymer.

[UV absorber]

The dispersion composition of the present embodiment may contain an ultraviolet absorber.

As the ultraviolet absorber, a compound represented by the following formula (I), which is a conjugated diene compound, is particularly preferable.

일반식(I)

The compound of formula (I)

In the formula (I), R ¹ and R ² each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 20 carbon atoms, and R ¹ and R ² may be the same or different from each other But does not represent a hydrogen atom at the same time. In the above formula (I), R ³ and R ⁴ represent electron-withdrawing groups. Herein, the electron-withdrawing group is an electron-accepting group having a Hammet's substituent constant sigma p value (hereinafter, simply referred to as &quot; sigma p value &quot;) of 0.20 or more and 1.0 or less. Preferably, the electron acceptor has a sigma p value of 0.30 or more and 0.8 or less.

The description of the substituent of the ultraviolet absorber represented by the above formula (I) is based on the description of WO2009 / 123109 paragraphs 0024 to 0033 (corresponding to [0040] to [0057] of U.S. Patent Application Publication No. 2011/0039195) , The contents of which are incorporated herein by reference. Preferred examples of the compound represented by the above formula (I) are exemplified compounds (1) to (14) in WO2009 / 123109 paragraphs 0034 to 0039 (corresponding to U.S. Patent Application Publication No. 2011/0039195 [0060] ), The contents of which are incorporated herein by reference.

The concentration of the ultraviolet absorber in the dispersion composition (I) of the present embodiment is preferably 0.1% by mass to 10% by mass, more preferably 0.1% by mass to 5% by mass, more preferably 0.1% % Is particularly preferable.

<Dispersion Composition II>

The composition containing the high refractive index material may be the dispersion composition II described below.

The dispersion composition II refers to a dispersion composition containing a metal oxide particle (A) having a primary particle diameter of 1 nm to 100 nm, a specific dispersion resin (B), and a solvent (C). Here, the components other than the specific dispersion resin (B) are the same as the above dispersion composition I.

Specific dispersion resin (B)

As the dispersing agent for high refractive index particle dispersion, it is preferable to use an oligimidine-based dispersing agent containing nitrogen atom in at least one of the main chain and the side chain. As the oligomeric dispersant, a dispersant having a side chain containing a repeating unit having a partial structure X having a pKa of 14 or less and a side chain Y of 40 to 10,000 atoms and having a basic nitrogen atom in at least one of the main chain and the side chain (Hereinafter referred to as &quot; specific dispersion resin (B) &quot; Here, the basic nitrogen atom is not particularly limited as long as it is a nitrogen atom showing basicity.

The specific resin (B) may have a partial structure W paired with the partial structure X or the like, and the partial structure W is preferably a structural part having nitrogen atoms having a pK _{b of} 14 or less, and a structure having a nitrogen atom of pK _b 10 or less Is more preferable. Base strength pK _b is to say the pK _b of the temperature 25 ℃, and one of the indicators for indicating the strength of the base to quantitatively, basicity is as defined integer. The base strength pK _b and the acid strength pK _a described later are in the relationship of pK _b = 14 - pK _a . When the partial structure X and the partial structure W are paired to form a salt structure, the structure is assumed to be a decomposed structure, and a proton (H +) or a hydroxide ion (OH-) is ionically bonded thereto. The pKb is evaluated. Details of the partial structure X will be described later.

Details of the preferable range for the partial structure X are the same as the partial structure X described later. As for the side chain Y, the details of the preferred range thereof are the same as those of the side chain Y described later. And W is a structure in which the connecting portion of the side chain Y is decomposed to become an ion-binding site.

The specific dispersing resin (B) is at least one selected from the group consisting of (i) a poly (lower alkyleneimine) repeating unit, a polyallylamine repeating unit, a polydiallylamine repeating unit, a metaxylenediamine-epichlorohydrin polycondensation repeating unit, (I) a repeating unit having at least one basic nitrogen atom selected from polyvinylamine-based repeating units and having a partial structure X bonded to the basic nitrogen atom and having a functional group having a pKa of 14 or less, (Hereinafter referred to as &quot; specific dispersion resin (B1) &quot;, as appropriate) having side chains (ii) containing side chains Y of 40 to 10,000 atoms.

The specific dispersion resin (B1) has the repeating unit (i). As a result, the adsorption force of the dispersion resin on the particle surface can be improved and the interaction between the particles can be reduced. The poly (lower alkyleneimine) may be either linear or delocalized. Here, the lower alkyleneimine means an alkyleneimine containing an alkylene chain having 1 to 5 carbon atoms. It is preferable that the repeating unit (i) forms a main chain portion in the specific dispersion resin. The number average molecular weight of the main chain portion, that is, the number average molecular weight of the portion excluding the side chain containing the side chain Y portion from the specific dispersion resin (B1) is preferably 100 to 10,000, more preferably 200 to 5,000, Is particularly preferable. The number average molecular weight of the main chain portion can be measured by the polystyrene conversion value by the GPC method.

The repeating unit represented by the formula (I-1) and the repeating unit represented by the formula (I-2) or the repeating unit represented by the formula (I-1) Is preferably a dispersion resin containing a repeating unit represented by the following formula

R ¹ and R ² each independently represent a hydrogen atom, a halogen atom or an alkyl group (preferably having 1 to 6 carbon atoms). a independently represents an integer of 1 to 5; * Represents a connection between repeating units.

R ⁸ and R ⁹ are the same as R ¹ .

L is a single bond, an alkylene group (preferably having 1 to 6 carbon atoms), an alkenylene group (preferably having 2 to 6 carbon atoms), an arylene group (preferably having 6 to 24 carbon atoms), a heteroarylene group (Preferably 0 to 6 carbon atoms), an ether group, a thioether group, a carbonyl group, or a combination thereof. Among them, a single bond or -CR ⁵ R ⁶ -NR ⁷ - (imino group is X or Y) is preferable. Here, each of R ⁵ R ⁶ independently represents a hydrogen atom, a halogen atom, or an alkyl group (preferably having 1 to 6 carbon atoms). R ⁷ is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

L ^a is a structural moiety forming a cyclic structure together with CR ⁸ CR ⁹ and N, and is preferably a structural moiety forming a non-aromatic heterocycle having 3 to 7 carbon atoms combined with carbon atoms of CR ⁸ CR ⁹ . More preferably a structural part forming a non-aromatic heterocycle having 5 to 7 atoms combined with a carbon atom and N (nitrogen atom) of CR ⁸ CR ⁹ , more preferably a structure forming a 5-membered non-aromatic heterocycle And is a structural moiety forming pyrrolidine. However, the structural moiety may further have a substituent such as an alkyl group.

X represents a group having a functional group having a pKa of 14 or less.

Y represents a side chain having 40 to 10,000 atoms.

The specific dispersion resin (B1) preferably has a repeating unit represented by formula (I-3), formula (I-4) or formula (I-5) as a copolymer component. The specific dispersing resin (B1) contains such a repeating unit, so that the dispersing performance can be further improved.

R ¹ , R ² , R ⁸ , R ⁹ , L, La and a have the same meanings as defined in formula (I-1), (I-2) and (I-2a).

Ya represents a side chain having 40 to 10,000 atoms having an anionic group. The repeating unit represented by the formula (I-3) can be formed by reacting a resin having a primary or secondary amino group in the main chain portion with an oligomer or polymer having a group capable of forming a salt by reacting with an amine. Ya is preferably the following formula (III-2).

In the formulas (I-1) to (I-5), R ¹ and R ² are preferably hydrogen atoms. a is preferably 2 from the viewpoint of raw material availability.

The specific dispersion resin (B1) may contain a lower alkyleneimine containing a primary or tertiary amino group as a repeating unit. Further, the nitrogen atom in such a lower alkyleneimine repeating unit may further include a group represented by X, Y or Ya. A resin containing both a repeating unit bonded with a group represented by X in the main chain structure and a repeating unit in which Y is bonded is also included in the specific dispersing resin (B1).

The repeating unit represented by the formula (I-1) is preferably contained in an amount of 1 to 80 mol%, more preferably 3 to 50 mol%, and more preferably 3 to 20 mol%, of the total repeating units contained in the specific dispersion resin (B1) from the viewpoints of storage stability and developability. Most preferably, The repeating unit represented by the formula (I-2) is preferably contained in an amount of from 10 to 90 mol%, more preferably from 30 to 70 mol%, of the total repeating units contained in the specific dispersion resin (B1) Is most preferable. (I-1): (I-2)) of the repeating unit (I-1) and the repeating unit (I-2) is in the range of 10: 1 to 1 : 100, and more preferably in the range of 1: 1 to 1:10. The repeating unit represented by the formula (I-3) used together with the desired amount is preferably contained in the range of 0.5 to 20 mol%, more preferably in the range of 1 to 10 Mol% is most preferable. The fact that the polymer chain Ya is ionically bound can be confirmed by infrared spectroscopy or base titration.

The description of the copolymerization ratio of the above formula (I-2) is also an agreement with respect to the repeating unit represented by the formula (I-2a), the formula (I-4) and the formula (I-5) It means the total amount.

· Substructure X

The partial structure X in each of the above formulas has a functional group having a pKa of 14 or less at a water temperature of 25 캜. The term &quot; pKa &quot; as referred to herein is a definition described in the Chemical Manual (II) (revised fourth edition, 1993, edited by the Japanese Chemical Society, Maruzen Co., Ltd.). The "functional group having a pKa of 14 or less" preferably satisfies this condition, and the structure and the like are not particularly limited, and the pKa in the known functional group satisfies the above-mentioned range. Among them, a functional group having a pKa of 12 or less And a functional group having a pKa of 11 or less is particularly preferable. Although there is no particular lower limit value, it is practical that it is -5 or more. Specifically, for example, a carboxylic acid group as a partial structure X (pKa: about 3~5), sulfonic acid (pKa: -3~-2 degree), -COCH ₂ CO- (pKa: about 8 to 10), - COCH ₂ CN (pKa: about 8 to 11), -CONHCO-, phenolic hydroxyl group, -RFCH ₂ OH or - (RF) ₂ CHOH (R _F represents a perfluoroalkylene group or a perfluoroalkyl group, (PKa: about 3 to about 5), a sulfonic acid group (about pKa: about 3 to about 2), -COCH ₂ CO- (pKa: about 8 to 10) is preferable.

When the pKa of the functional group of the partial structure X is 14 or less, interaction with high refractive index particles can be achieved. The partial structure X is preferably bonded directly to a basic nitrogen atom in the repeating unit having a basic nitrogen atom. The partial structure X may be connected not only to a covalent bond but also to a form that forms a salt by ionic bonding. The partial structure X preferably has a structure represented by the following formula (V-1), (V-2) or (V-3).

U represents a single bond or a divalent linking group.

d and e independently represent 0 or 1;

Q represents an acyl group or an alkoxycarbonyl group.

Examples of the divalent linking group represented by U include alkylene (more specifically, for example, -CH ₂ -, -CH ₂ CH ₂ -, -CH ₂ CHMe- (wherein Me represents a methyl group), - (CH ₂ ) _{5 -, -CH 2 CH (nC} 10 H 21) - and the like), specifically, for example, -CH ₂ OCH ₂ more alkylene (which contains oxygen _{-, -CH 2 CH 2 OCH 2} CH 2 - , etc.) An alkylene group having 1 to 30 carbon atoms or an arylene group having 6 to 20 carbon atoms is preferable, and an alkylene group having 1 to 20 carbon atoms or an arylene group having 6 to 15 carbon atoms is particularly preferable Do.

From the viewpoint of productivity, d is preferably 1, and e is preferably 0.

Q represents an acyl group or an alkoxycarbonyl group. As the acyl group in Q, an acyl group having 1 to 30 carbon atoms is preferable, and acetyl is particularly preferable. Alkoxycarbonyl group as Q, particularly the ease of groups are preferred, and the acetyl group is acyl prepared according to Q, it is preferable from the viewpoint of availability of raw material (precursor of the X X ^a).

The partial structure X is preferably bonded to the basic nitrogen atom in the repeating unit having a basic nitrogen atom. As a result, the dispersibility and the dispersion stability of the titanium dioxide particles are remarkably improved. It is considered that the partial structure X also imparts solvent solubility and suppresses the precipitation of the resin with time, thereby contributing to the dispersion stability. Further, since the partial structure X contains a functional group having a pKa of 14 or less, it also functions as an alkali-soluble group. By this means, it is considered that the developability is improved, and both the dispersibility, the dispersion stability, and the developability can be achieved.

The content of the functional group having a pKa of 14 or less in the partial structure X is not particularly limited, but is preferably 0.01 to 5 mmol, particularly preferably 0.05 to 1 mmol, per g of the specific dispersion resin (B1). From the viewpoint of the acid value, the acid value of the specific dispersion resin (B1) is preferably in the range of about 5 to 50 mgKOH / g from the viewpoint of developability.

· Side chain Y

Examples of Y include known polymer chains such as polyester, polyamide, polyimide and poly (meth) acrylate which can be connected to the main chain portion of the specific dispersing resin (B1). The bonding site of Y with the specific dispersing resin (B1) is preferably the end of the side chain Y.

Y is selected from poly (lower alkyleneimine) repeating units, polyallylamine repeating units, polydialylamine repeating units, metaxylenediamine-epichlorohydrin polycondensate repeating units, and polyvinylamine repeating units Is bonded to the nitrogen atom of the repeating unit having at least one nitrogen atom. A repeating unit selected from the group consisting of a poly (lower alkyleneimine) repeating unit, a polyallylamine repeating unit, a polydiallylamine repeating unit, a metaxylenediamine-epichlorohydrin polycondensation repeating unit, and a polyvinylamine repeating unit The bonding form of the main chain portion and Y of the repeating unit having at least one basic nitrogen atom is a covalent bond, an ionic bond, or a combination of a covalent bond and an ionic bond. The ratio of the bonding form of Y to the main chain portion is covalent bond: ion bond = 100: 0 to 0: 100, but is preferably 95: 5 to 5:95, and particularly preferably 90:10 to 10:90.

Y is preferably ion-bonded to the nitrogen atom of the repeating unit having a basic nitrogen atom as an amide bond or a carboxylate.

The number of atoms of the side chain Y is preferably 50 to 5,000, and more preferably 60 to 3,000 from the viewpoints of dispersibility, dispersion stability, and developability.

The number average molecular weight of Y can be measured by polystyrene conversion value by GPC method. At this time, it is practical to measure the molecular weight of Y in a state before it is contained in the resin. The number average molecular weight of Y is preferably 1,000 to 50,000, and particularly preferably 1,000 to 30,000 from the viewpoints of dispersibility, dispersion stability, and developability. The molecular weight of Y can be specified from the polymer compound to be the raw material of Y, and the measurement method is performed in the order of the measurement conditions by later GPC.

The branched structure represented by Y is preferably linked to two or more of the main chain of the resin in one molecule of the resin, and it is particularly preferable that five or more of them are connected.

Particularly, it is preferable that Y has a structure represented by the formula (III-1).

In the formula (III-1), Z represents a polymer or oligomer having a polyester chain as a partial structure, and represents a residue other than a carboxyl group from a polyester having a free carboxylic acid represented by HO-CO-Z. When the specific dispersing resin (B1) contains a repeating unit represented by the formula (I-3) to (I-5), Ya is preferably a formula (III-2).

Z in the formula (III-2) has the same meaning as Z in the formula (III-1). In the partial structure Y, the polyester having a carboxyl group at one end may be a polycondensation of a carboxylic acid and a lactone, a polycondensation of a hydroxy group-containing carboxylic acid, a polycondensation of a dihydric alcohol and a dicarboxylic acid (or a cyclic acid anhydride) .

Z is preferably - (L ^B ) _n ^B -Z ^B.

Z ^B represents a hydrogen atom or a monovalent organic group. When Z ^B is an organic group, an alkyl group (preferably having 1 to 30 carbon atoms), an aryl group, a heterocyclic group and the like are preferable. Z ^B may also have a substituent, and examples of the substituent include an aryl group having 6 to 24 carbon atoms and a heterocyclic group having 3 to 24 carbon atoms.

L ^B is an alkylene group (preferably having 1 to 6 carbon atoms), an alkenylene group (preferably having 2 to 6 carbon atoms), an arylene group (preferably having 6 to 24 carbon atoms), a heteroarylene group An imino group (preferably having 0 to 6 carbon atoms), an ether group, a thioether group, a carbonyl group, or a combination thereof. Among them, an alkylene group (preferably having 1 to 6 carbon atoms), an ether group, a carbonyl group, or a linking group depending on a combination thereof is preferable. The alkylene group may be branched or straight-chain. The alkylene group may have a substituent and preferred examples of the substituent include an alkyl group (preferably having 1 to 6 carbon atoms), an acyl group (preferably having 2 to 6 carbon atoms), an alkoxy group (having preferably 1 to 6 carbon atoms) or an alkoxycarbonyl group 8). nB is an integer of 5 to 100,000. nB L ^B may be different from each other.

The concrete form of the specific dispersing resin (B) is shown below by the specific structure of the repeating unit of the resin and the combination thereof, but the present invention is not limited thereto (see also Japanese Patent Laid-Open Publication No. 2010-6932 The following description can be considered, and the contents of these are included in the present specification). K is from 1 to 80, l is from 10 to 90, m is from 0 to 80, n is from 0 to 70, k + 1, m, and n are each a polymerization molar ratio of repeating units, l + m + n = 100. The definition of k, l, m is defined as k + l + m = 100 and k + l = 100, respectively. p and q represent the number of linkages of the polyester chain, and each independently represents 5 to 100,000. R ^a represents a hydrogen atom or an alkoxycarbonyl group.

(1) a method of reacting a resin having a primary or secondary amino group with a precursor x of the partial structure X and a precursor y of Y, (2) a method of reacting the precursor x of the partial structure X with the structure corresponding to the partial structure X Or by a method of polymerization of a monomer containing Y and a macromonomer containing Y or the like. First, a resin having a primary or secondary amino group in its main chain is synthesized, and then the precursor x of X and the precursor y of y are reacted with the resin, and introduced into the nitrogen atom present in the main chain by a polymer reaction . For details of the manufacturing method, refer to Japanese Patent Application Laid-Open No. 2009-203462.

The molecular weight of the specific dispersion resin B is preferably from 3,000 to 100,000 in terms of weight average molecular weight, more preferably from 5,000 to 55,000, and the weight average molecular weight within the above range is sufficient to exert the effect of the plurality of adsorption sites introduced at the ends of the polymer So that it is possible to exhibit excellent performance in adsorption to the surface of titanium dioxide particles. In the present specification, unless otherwise stated, GPC was measured using HLC-8020GPC (manufactured by TOSOH CORPORATION), and the column was measured as TSKgel Super HZM-H, TSKgel Super HZ4000 and TSKgel Super HZ200 (products of TOSOH CORPORATION) . The carrier may be appropriately selected, but tetrahydrofuran is used as far as it is soluble.

In the photosensitive composition of the present invention, the dispersant for high refractive index particles may be used singly or in combination of two or more.

In the dispersion composition (II) of the present embodiment, the specific resins may be used singly or in combination of two or more kinds.

The content of the specific resin with respect to the total solid content of the dispersion composition (II) is preferably in the range of 10 to 50 mass%, more preferably in the range of 11 to 40 mass%, and more preferably in the range of 12 to 30 mass% The range of mass% is more preferable.

Further, the high refractive index material may be the dispersion composition III described below.

<Dispersion Composition III>

The dispersion composition III refers to a dispersion composition containing a metal oxide particle (A) having a primary particle diameter of 1 nm to 100 nm, a polymer compound dispersing agent (B) represented by the following formula (1), and a solvent (C). Here, components other than the polymer compound (B) represented by the following formula (1) are the same as the above-mentioned dispersion compositions I and II.

In the formula (1), R ¹ represents an (m + n) linking group, and R ² represents a single bond or a divalent linking group. A ¹ represents a group having an acid, a urea group, a urethane group, a group having a radial oxygen atom, a group having a basic nitrogen atom, a phenol group, an alkyl group, an aryl group, a group having an alkyleneoxy group, an imide group, Represents a monovalent substituent having at least one group selected from the group consisting of a carbonyl group, an alkylaminocarbonyl group, a carboxylate group, a sulfonamide group, an alkoxysilyl group, an epoxy group, an isocyanate group and a hydroxyl group. n A ¹ and R ² may be the same or different.

In the dispersion composition of the present invention, since the substituent A ¹ possessed by the polymer compound (B) can interact with the metal oxide particle (A), the polymer compound (B) contains n (1 to 9) By having A ¹ , it is possible to strongly interact with the metal oxide particles (A). Further, the polymer chain P ¹ having m polymer compounds (B) can function as a three-dimensional rebounder, and when the number of the polymer chains is m, the metal oxide particles can be uniformly dispersed by exhibiting a good steric repulsion. In addition, it is presumed that the polymeric compound (B) has no molecular structure, and no adverse effects such as agglomeration of particles due to intergranular crosslinking, which may occur in a conventional dispersant of a graft random structure, occur.

<(A) Metal oxide particle having a primary particle diameter of 1 nm to 100 nm> As the metal oxide particle (A) in the present invention, the same materials as the above-mentioned dispersion composition I can be used. The concentration of the metal oxide particles in the dispersion composition (or the curable composition described below) of the present invention is preferably 65 mass% or more, more preferably 70 mass% or more, based on the total solid content of the dispersion composition from the viewpoint of obtaining a high refractive index . The upper limit of the concentration is not particularly limited, but is preferably 90% by mass or less, more preferably 85% by mass or less based on the total solid content of the dispersion composition.

&Lt; (B) Polymer compound represented by the above formula (1) > Each unit in the formula (1) will be described in detail below. A ¹ represents a monovalent substituent having at least one structure capable of adsorbing the metal oxide particle (A) such as a functional group or a heterocyclic structure having an adsorption ability to the metal oxide particle (A).

Hereinafter, the site (the above functional group and structure) having adsorptivity to the metal oxide particle (A) will be collectively referred to as &quot; adsorption site &quot;.

At least one adsorption site may be included in one A ¹ , or two or more adsorption sites may be included. Examples of the form in which two or more adsorption sites are contained in one A ¹ include a chain saturated hydrocarbon group (may be linear or branched, preferably having 1 to 10 carbon atoms), cyclic saturated hydrocarbon group (having 3 to 10 carbon atoms And a form in which two or more adsorption sites are bonded to form a monovalent substituent A ¹ through an aromatic group (preferably having 5 to 10 carbon atoms, such as a phenylene group), and the like, and chain saturated hydrocarbon A form wherein two or more adsorption sites are bonded to form a monovalent substituent A ¹ is preferable. In addition, when the adsorption site itself constitutes a monovalent substituent, the adsorption site itself may be a monovalent substituent represented by A ¹ . First, the adsorption sites constituting the above A ¹ will be described below.

Examples of the "acid group" include carboxylic acid groups, sulfonic acid groups, mono sulfuric acid ester groups, phosphoric acid groups, monophosphoric acid ester groups, phosphonic acid groups, phosphinic acid groups and boric acid groups as preferable examples, , A phosphoric acid group, a phosphonic acid group and a phosphinic acid group are more preferable, and a carboxylic acid group is particularly preferable.

For example, -NR ¹⁵ CONR ¹⁶ R ¹⁷ wherein R ¹⁵ , R ¹⁶ and R ¹⁷ are each independently a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 or more carbon atoms, -NR ¹⁵ CONHR ¹⁷ wherein R ¹⁵ and R ¹⁷ are each independently a hydrogen atom or an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 or more carbon atoms, , More preferably an aralkyl group having 7 or more carbon atoms), -NHCONHR ¹⁷ (wherein R ¹⁷ represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 or more carbon atoms, or an aralkyl group having 7 or more carbon atoms ) Is particularly preferable.

As the "urethane group", for example, ^{-NHCOOR 18, -NR 19 COOR 20,} -OCONHR 21, -OCONR 22 R 23 ( ^{wherein, R 18, R 19, R} 20, R 21, R 22 and R ²³ is Each independently represents an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 or more carbon atoms, or an aralkyl group having 7 or more carbon atoms), and examples thereof include -NHCOOR ¹⁸ , -OCONHR ²¹ (wherein R ¹⁸ and R ²¹ More preferably an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 or more carbon atoms, or an aralkyl group having 7 or more carbon atoms), -NHCOOR ¹⁸ , -OCONHR ²¹ (wherein R ¹⁸ and R ²¹ are Each independently represent an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 or more carbon atoms, or an aralkyl group having 7 or more carbon atoms).

Examples of the "group having a radial oxygen atom" include an acetylacetonate group, a crown ether, and the like. Examples of the group having a basic nitrogen atom include an amino group (-NH ₂ ), a substituted imino group (-NHR ⁸ , -NR ⁹ R ¹⁰ , wherein R ⁸ , R ⁹ and R ¹⁰ are each independently a carbon number An alkyl group having 1 to 20 carbon atoms (preferably 1 to 5 carbon atoms), an aryl group having 6 or more carbon atoms (preferably 6 to 30 carbon atoms), and an aralkyl group having 7 or more carbon atoms (preferably 7 to 30 carbon atoms) A guanidyl group represented by the following formula (a1), and an amidinyl group represented by the following formula (a2).

In formula (a1), R ¹¹ and R ¹² each independently represent an alkyl group having 1 to 20 carbon atoms (preferably 1 to 5 carbon atoms), an aryl group having 6 or more carbon atoms (preferably 6 to 30 carbon atoms) (Preferred number of carbon atoms is 7 to 30). Equation (a2) of the R ¹³ and R ¹⁴ are each independently an alkyl group having a carbon number 1-20 (the preferred carbon number is 1 to 5), having a carbon number of 6 or more aryl group (the preferred carbon number is 6-30), a carbon number of 7 (Preferred number of carbon atoms is 7 to 30).

The alkyl group represented by the substituent A ¹ may be linear or branched, preferably an alkyl group having 1 to 40 carbon atoms, more preferably an alkyl group having 4 to 30 carbon atoms, further preferably an alkyl group having 10 to 18 carbon atoms Do. The aryl group represented by the substituent A ¹ is preferably an aryl group having 6 to 10 carbon atoms. As the above-mentioned "group having an alkyleneoxy group", it is preferable that the terminal form an alkyloxy group or a hydroxyl group, more preferably an alkyloxy group having 1 to 20 carbon atoms. The alkyleneoxy chain is not particularly limited as long as it has at least one alkyleneoxy group, but it is preferably composed of an alkyleneoxy group having 1 to 6 carbon atoms. Examples of the alkyleneoxy group include -CH ₂ CH ₂ O-, -CH ₂ CH ₂ CH ₂ O-, and the like. The alkyl moiety in the above "alkyloxycarbonyl group" and "alkylaminocarbonyl group" is preferably an alkyl group having 1 to 20 carbon atoms. Examples of the &quot; carboxylic acid base &quot; include groups composed of an ammonium salt of a carboxylic acid. As the above-mentioned "sulfonamide group", a hydrogen atom bonded to a nitrogen atom may be substituted with an alkyl group (methyl group, etc.), an acyl group (acetyl group, trifluoroacetyl group, etc.)

Examples of the above-mentioned "heterocyclic structure" include thiophene, furan, xanthene, pyrrole, pyrrole, pyrrolidine, dioxolane, pyrazole, pyrazoline, pyrazolidine, imidazole, oxazole, thiazole, But are not limited to, oxadiazole, triazole, thiadiazole, pyran, pyridine, piperidine, dioxane, morpholine, pyridazine, pyrimidine, piperazine, triazine, trithiane, isoindolinone, Benzothiazole, hydantoin, indole, quinoline, carbazole, acridine, acridone, and anthraquinone are listed as preferred examples.

Examples of the "imide group" include succinimide, phthalimide, naphthalimide, and the like.

The above "heterocyclic structure" and "imide group" may further have a substituent. Examples of the substituent include an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 16 carbon atoms, a hydroxyl group, an amino group, , An acyloxy group having 1 to 6 carbon atoms such as a sulfonamide group, an N-sulfonylamide group and an acetoxy group, an alkoxy group having 1 to 20 carbon atoms, a halogen atom, a methoxycarbonyl group, an ethoxycarbonyl group, And carbonic ester groups such as an alkoxycarbonyl group having 2 to 7 carbon atoms such as a carbonyl group, cyano group and t-butyl carbonate.

The "alkoxysilyl group" may be any of a monoalkoxysilyl group, a dialkoxysilyl group and a trialkoxysilyl group, but it is preferably a trialkoxysilyl group. For example, a trimethoxysilyl group, a triethoxysilyl group . Examples of the "epoxy group" include a substituted or unsubstituted oxylanyl group (ethylene oxide group).

In particular, A ¹ is preferably a monovalent substituent having at least one functional group having a pKa of 5 or more, more preferably a monovalent substituent having at least one functional group having a pKa of 5 to 14. The term &quot; pKa &quot; referred to herein is a definition described in the Chemical Manual (II) (revised edition 4, 1993, edited by the Japanese Chemical Society, Maruzen Co., Ltd.). Examples of the functional group having a pKa of 5 or more include a group having a saturated oxygen atom, a group having a basic nitrogen atom, a phenol group, a urea group, a urethane group, an alkyl group, an aryl group, an alkyloxycarbonyl group, an alkylaminocarbonyl group, , An imide group, a carboxylic acid group, a sulfonamide group, a hydroxyl group, and a heterocyclic group. Specific examples of the functional group having a pKa of 5 or more include phenol groups (pKa about 8 to 10), alkyl groups (pKa about 46 to about 53), aryl groups (about pKa about 40 to 43), urea (pKa about 12 to 14) -COCH ₂ CO- (pKa 8 to 10), sulfonamide group (pKa 9 to 11), hydroxyl group (pKa 15 to 17), complex Ventilation (about 12 to 30 pKa) are listed. Among them, the group A ¹ includes a group having an acid group, a phenol group, an alkyl group, an aryl group, a group having an alkyleneoxy group, a hydroxyl group, a urea group, a urethane group, a sulfonamide group, an imide group, Is a monovalent substituent having at least one group selected from

In the formula (1), R ² represents a single bond or a divalent linking group. n R &lt; ² &gt; may be the same or different. The divalent linking group represented by R ² is preferably a group consisting of 1 to 100 carbon atoms, 0 to 10 nitrogen atoms, 0 to 50 oxygen atoms, 1 to 200 hydrogen atoms, and 0 to 20 sulfur atoms Group, and may be unsubstituted or may further have a substituent.

R ^{2 is a} single bond or a divalent link consisting of 1 to 10 carbon atoms, 0 to 5 nitrogen atoms, 0 to 10 oxygen atoms, 1 to 30 hydrogen atoms, and 0 to 5 sulfur atoms Group is preferable. R ² is preferably a chain saturated hydrocarbon group (may be linear or branched and preferably has 1 to 20 carbon atoms), a cyclic saturated hydrocarbon group (preferably having 3 to 20 carbon atoms), an aromatic group (having 5 to 20 carbon atoms And more preferably a group selected from the group consisting of a thioether bond, an ester bond, an amide bond, an ether bond, a nitrogen atom, and a carbonyl group, or a combination of two or more thereof, A group selected from the group consisting of a saturated hydrocarbon group, a cyclic saturated hydrocarbon group, an aromatic group, a thioether bond, an ester bond, an ether bond, and an amide bond, or a group obtained by combining two or more thereof is more preferable, and a chain saturated hydrocarbon Group, a thioether bond, an ester bond, an ether bond, and an amide bond, A combination of two or more of these groups are particularly preferred.

When the divalent connecting group represented by R ² has a substituent, examples of the substituent include an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 16 carbon atoms, a hydroxyl group, an amino group, a carboxyl group, a sulfonamide group, An alkoxy group having 1 to 6 carbon atoms, a halogen atom, a methoxycarbonyl group, an ethoxycarbonyl group, a cyclohexyloxycarbonyl group, etc., having 2 to 6 carbon atoms, such as an acetoxy group, And a carbonate ester group such as an alkoxycarbonyl group, a cyano group, and a t-butylcarbonate group.

In the above formula (1), R ¹ represents an (m + n) linking group. and m + n satisfies 3 to 10. The (m + n) linking group represented by R ¹ may include 1 to 100 carbon atoms, 0 to 10 nitrogen atoms, 0 to 50 oxygen atoms, 1 to 200 hydrogen atoms, and 0 to 20 A group consisting of sulfur atoms, and may be unsubstituted or may further have a substituent.

It is preferable that the (m + n) linking group represented by R ¹ is a group represented by any one of the following formulas.

In the above formula, L ₃ represents a trivalent group. T ₃ represents a single bond or a divalent linking group, and the three T ₃ present may be the same or different. L ₄ represents a tetravalent group. T ₄ represents a single bond or a divalent linking group, and the four T ₄ present may be the same or different. L ₅ represents a five-valent group. T ₅ represents a single bond or a divalent linking group, and five T ₅ present may be the same or different. L ₆ represents a 6-valent group. T ₆ represents a single bond or a divalent linking group, and the six T ₆ present may be the same or different. Specific examples (specific examples (1) to (17)) of the (m + n) -valent linking group represented by R ¹ are shown below. However, the present invention is not limited thereto.

Of the above specific examples, particularly preferable (m + n) linking groups from the viewpoint of availability of raw materials, ease of synthesis and solubility in various solvents are the following (1), (2), (10) (16) and (17).

In the above formula (1), m represents a positive number of 8 or less. m is preferably from 0.5 to 5, more preferably from 1 to 4, and particularly preferably from 1 to 3. In the above formula (1), n represents 1 to 9. n is preferably 2 to 8, more preferably 2 to 7, and particularly preferably 3 to 6. m P ¹ may be the same or different.

In the above formula (1), P ¹ represents a polymer chain, and can be selected from known polymers or the like according to purposes. m P ¹ may be the same or different. In order to form polymer chains among polymers, polymers or copolymers of vinyl monomers, ester polymers, ether polymers, urethane polymers, amide polymers, epoxy polymers, silicone polymers, and modified products or copolymers thereof , A polyether / polyurethane copolymer, a copolymer of a polymer of a polyether / vinyl monomer (including any one of a random copolymer, a block copolymer and a graft copolymer)] And more preferably at least one member selected from the group consisting of polymers or copolymers of vinyl monomers, ester polymers, ether polymers, urethane polymers, and modified products or copolymers thereof, and more preferably at least one polymer or copolymer of vinyl monomers Coalescence is particularly preferred. As the polymer or copolymer, ester-based polymer and ether-based polymer of the vinyl monomer that the polymer chain P ¹ may have, it is preferable to have a structure represented by the following formulas (L), (M) and (N), respectively.

Wherein,

X ¹ represents a hydrogen atom or a monovalent organic group. It is preferably a hydrogen atom or an alkyl group having 1 to 12 carbon atoms, more preferably a hydrogen atom or a methyl group, and particularly preferably a methyl group.

R ¹⁰ represents a hydrogen atom or a monovalent organic group, and is preferably a hydrogen atom, an alkyl group, an aryl group, or a heteroaryl group, more preferably a hydrogen atom or an alkyl group, though it is not particularly limited in structure. When R ¹⁰ is an alkyl group, the alkyl group is preferably a straight chain alkyl group having from 1 to 20 carbon atoms, a branched alkyl group having from 3 to 20 carbon atoms, or a cyclic alkyl group having from 5 to 20 carbon atoms, more preferably a straight chain alkyl group having from 1 to 20 carbon atoms And a straight chain alkyl group having 1 to 6 carbon atoms is particularly preferable. In formula (L), two or more types of R ¹⁰ having different structures may be contained.

R ¹¹ and R ¹² are branched or straight chain alkylene groups (preferably 1 to 10 carbon atoms, more preferably 2 to 8 carbon atoms, and more preferably 3 to 6 carbon atoms). And two or more kinds of R ¹¹ or R ¹² having different structures may be contained in each formula.

k1, k2, and k3 each independently represent a number of 5 to 140.

It is preferable that the polymer chain P ¹ contains at least one kind of repeating unit. From the viewpoint that the repeating number k of the above-mentioned at least one kind of repeating unit in the polymer chain P ¹ exerts a steric repulsion force and improves dispersion stability, the number is preferably 5 or more, more preferably 7 or more. From the viewpoint of inhibiting the volume of the polymer compound (B) from increasing and densely present the metal oxide particles (A) in the cured film (transparent film) and achieving a high refractive index, The number of repeating units k is preferably 140 or less, more preferably 130 or less, and even more preferably 60 or less.

The polymer is preferably soluble in an organic solvent. If the affinity with the organic solvent is low, the affinity with the dispersion medium becomes weak, and the adsorption layer sufficient for dispersion stabilization can not be secured in some cases. Examples of the vinyl monomer include, but are not limited to, (meth) acrylic esters, crotonic acid esters, vinyl esters, vinyl monomers having an acid group, maleic acid diesters, fumaric acid diesters, itaconic acid diesters (Meth) acrylates, styrenes, vinyl ethers, vinyl ketones, olefins, maleimides and (meth) acrylonitrile are preferable, and (meth) acrylic acid esters, crotonic acid esters, vinyl More preferably a vinyl monomer having an ester group or an acid group, and more preferably a (meth) acrylic acid ester or a crotonic acid ester. Preferred examples of these vinyl monomers include vinyl monomers described in JP-A No. 2007-277514, paragraphs 0089 to 0094, 0096 and 0097 (corresponding to U.S. Patent Application Publication No. 2010/233595, paragraphs 0105 to 0117, and 0119 to 0120) Vinyl monomers are listed, the contents of which are incorporated herein by reference.

In addition to the above compounds, vinyl monomers having functional groups such as urethane groups, urea groups, sulfonamide groups, phenol groups and imide groups can also be used. As such a monomer having a urethane group or a urea group, for example, an addition reaction of an isocyanate group with a hydroxyl group or an amino group can be used and the monomer can be synthesized appropriately. Concretely, the addition reaction of an isocyanate group-containing monomer with a compound containing one hydroxyl group or a compound containing one primary or secondary amino group or a reaction between a monomer containing a hydroxyl group or a monomer containing a primary or secondary amino group and a monoisocyanate And can be suitably synthesized by an addition reaction or the like.

Among the polymer compound (B) represented by the formula (1), a polymer compound represented by the following formula (2) is preferable.

In the formula (2), A ² has the same meaning as the A ¹ in the formula (1), and the preferable form thereof is also the same.

In the above formula (2), R ⁴ and R ⁵ each independently represent a single bond or a divalent linking group. n R ⁴ may be the same or different. Also, m different R ⁵ are the same or different. The divalent linking groups represented by R ⁴ and R ⁵ are the same as those listed as the divalent linking group represented by R ² in the formula (1), and their preferred embodiments are also the same. Among them, examples of the divalent linking group represented by R ⁴ and R ⁵ include a chain saturated hydrocarbon group (linear or branched, preferably having 1 to 20 carbon atoms), cyclic saturated hydrocarbon group (preferably having 3 to 20 carbon atoms , An aromatic group (preferably having 5 to 20 carbon atoms, for example, a phenylene group), an ester bond, an amide bond, an ether bond, a nitrogen atom and a carbonyl group or a combination of two or more thereof And a group selected from the group consisting of a chain saturated hydrocarbon group, a cyclic saturated hydrocarbon group, an aromatic group, an ester bond, an ether bond and an amide bond, or a group obtained by combining two or more of these groups is more preferable, and a chain saturated A group selected from the group consisting of a hydrocarbon group, an ester bond, an ether bond, and an amide bond, Is a combination of two or more of these groups.

In the above formula (2), R ³ represents a linking group of (m + n). The (m + n) linking group represented by R ³ may be unsubstituted or may further have a substituent, and the same as those listed as the (m + n) linking group represented by R ¹ in the formula (1) The preferred form is also the same. In the formula (2), m and n are the same as m and n in the formula (1), respectively, and their preferable forms are also the same. P ² in the formula (2) is the same as P ¹ in the formula (1), and the preferable form is also the same. m P ² may be the same or different. Among the polymer compounds represented by the formula (2), it is most preferable that all of R ³ , R ⁴ , R ⁵ , P ² , m and n shown below are satisfied. R ^{3 is} at least one selected from the group consisting of the above-mentioned specific examples (1), (2), (10), (11), (16) or (17), R ^{4 is a} single bond or chain saturated hydrocarbon group, a cyclic saturated hydrocarbon group, A group selected from the group consisting of a hydrogen atom, a bond, an amide bond, an ether bond, a nitrogen atom, and a carbonyl group, or a combination of two or more thereof, R ⁵ : a single bond, an ethylene group, a propylene group, (B). In the following groups, R ¹² represents a hydrogen atom or a methyl group, and 1 represents 1 or 2.

P ² : polymer or copolymer of vinyl monomer, ester polymer, ether polymer, urethane polymer and modified products thereof, m: 1 to 3, n: 3 to 6

Among the polymer compounds (B) represented by the above formula (1) or (2), the polymer compound represented by the following formula (5) is more preferable from the viewpoints of dispersion stability,

In the formula (5), R ⁶ represents a linking group of (m + n 1 + n 2), and R ⁷ to R ⁹ each independently represent a single bond or a divalent linking group. A ³ represents a monovalent substituent having at least one acid group. A ⁴ represents a monovalent substituent different from A ³ . n 1 A ³ and R ⁷ may be the same or different. n 2 A ⁴ and R ⁸ may be the same or different. m is the same as m in the formula (1), and the preferred form is also the same. n1 represents 1 to 8, n2 represents 1 to 8, and m + n1 + n2 satisfies 3 to 10. P ³ is the same as P ² in the formula (2) and the same is also a preferred form. m P ³ and R ⁹ may be the same or different, respectively. R ⁶ (m + n1 + n2) valent linking group Examples of the formula (1) R ^1, or the formula represented by R ³ of (2) (m + n) valent the same is used as that listed as the connector according to the preferred The shape is the same. As the divalent linking group for R ⁷ to R ⁹ , the same divalent linking groups as those represented by R ⁴ and R ⁵ in the above formula (2) are used, and the preferred form thereof is also the same. Specific examples of the acid group that the substituent A ³ may have include preferred examples of the acid group in the formula (1), which are the same as the specific examples and preferred examples described above. The substituent A ³ is more preferably a monovalent substituent having at least one acid group with a pKa of less than 5, more preferably a group selected from the group consisting of a sulfonic acid group, a carboxylic acid group, a phosphoric acid group, a phosphonic acid group and a phosphinic acid group at least 1 Particularly preferably a monovalent substituent having a double bond, and particularly preferably a carboxylic acid group. Specific examples of the monovalent substituent A ⁴ different from A ³ include the same as the groups other than the acid group in the specific examples and preferred examples described above with respect to A ¹ in the formula (1). Among them, the substituent A ⁴ is preferably a monovalent substituent having at least one functional group having a pKa of 5 or more, more preferably a group having a saturated oxygen atom, a group having a basic nitrogen atom, a phenol group, a urea group, A monovalent group having at least one group selected from the group consisting of an alkyl group, an aryl group, an alkyloxycarbonyl group, an alkylaminocarbonyl group, an alkyleneoxy group, an imide group, a carboxylate group, a sulfonamide group, a hydroxyl group and a heterocyclic group More preferably a substituent, particularly preferably an alkyl group, an aryl group, a group having a saturated oxygen atom, a group having a basic nitrogen atom, a urea group or a urethane group.

As the combination of the substituent A ³ and the substituent A ⁴ , the substituent A ³ is a monovalent substituent having at least one functional group having a pKa of less than 5, and the substituent A ⁴ is a monovalent substituent having at least one functional group having a pKa of 5 or more . Wherein the substituent A ³ is a monovalent substituent having at least one group selected from the group consisting of a carboxylic acid group, a sulfonic acid group, a phosphoric acid group, a phosphonic acid group and a phosphinic acid group, and the substituent A ⁴ is a group , A group having a basic nitrogen atom, a phenol group, a urea group, a urethane group, an alkyl group, an aryl group, an alkyloxycarbonyl group, an alkylaminocarbonyl group, a group having an alkyleneoxy group, an imide group, a carboxylate group, More preferably a monovalent substituent having at least one group selected from the group consisting of a hydroxyl group and a heterocyclic group. More preferably, the substituent A ³ is a monovalent substituent having a carboxylic acid group, and the substituent A ⁴ is an alkyl group, an aryl group, a group having a saturated oxygen atom, a group having a basic nitrogen atom, a urea group or a urethane group . From the viewpoint of favorable adsorption of the alkyl group of the substituent group A ^{3 to} the metallic oxide particle A (hereinafter referred to as titanium dioxide particle in particular), it is particularly preferable that the substituent A ³ is a carboxylic acid group and the substituent A ⁴ is an alkyl group Do. The reason why the adsorption of the titanium dioxide particle and the alkyl group of the substituent A ⁴ is good is presumably because the alkyl group of the stearic acid and the alkyl group of the substituent A ⁴ interact with each other, for example, when the titanium dioxide particle is surface-treated with stearic acid. The molecular weight of the polymeric compound (B) is preferably 1,000 to 50,000, more preferably 3,000 to 30,000, and particularly preferably 3,000 to 20,000 in terms of weight average molecular weight. When the weight average molecular weight is within the above range, the effects of the plurality of adsorption sites introduced at the ends of the polymer are sufficiently exerted, and the adsorbability to the surface of the metal oxide fine particles is excellent.

(Method of synthesizing the polymeric compound (B)) The polymeric compound represented by the above formula (1) or (2) is not particularly limited, but the synthesis method described in paragraphs 0114 to 0140 and 0266 to 0348 of Japanese Patent Application Laid- . &Lt; / RTI &gt; In the dispersion composition of the present invention, the polymer compound (B) may be used singly or in combination of two or more.

The concentration of the polymeric compound (B) relative to the total solid content of the dispersion composition (or the curable composition described below) of the present invention is preferably in the range of 5 to 40 mass%, more preferably in the range of 10 to 35 mass% , And more preferably in the range of 12 to 30 mass%.

-Other dispersion resin- Although the dispersion composition of the present invention contains a dispersion resin other than the specific resin (hereinafter sometimes referred to as &quot; other dispersion resin &quot;) for the purpose of adjusting the dispersibility of metal oxide particles or the like do. Examples of other dispersing resins that can be used in the present invention include polymer dispersants (for example, polyamide amines and salts thereof, polycarboxylic acids and their salts, high molecular weight unsaturated acid esters, modified polyurethanes, modified polyesters, Acrylate, (meth) acrylic copolymer, naphthalenesulfonic acid formalin condensate], and polyoxyethylene alkylphosphoric acid ester, polyoxyethylene alkylamine, alkanolamine, pigment derivative and the like. Other dispersing resins can be further classified into linear polymers, terminal modified polymers, graft polymers, and block polymers from the structure. Other dispersion resins adsorb on the surface of the metal oxide particles and act to prevent re-aggregation. Therefore, a terminal modified polymer, graft polymer, and block polymer having an anchor site on the surface of the metal oxide particle are preferable structures. On the other hand, the other dispersion resin has the effect of promoting the adsorption of the dispersion resin by modifying the surface of the metal oxide particles.

Specific examples of other dispersion resins include DISPERBYK 101 (polyamide amine phosphate), 107 (carboxylic acid ester), 110, 180 (copolymer containing an acid group), 130 (polyamide), 161, 162, 163 EFKA 4047, 4050, 4010, 4165 (polyurethane system), EFKA 4330, and EFKA products of EFKA Co., Ltd., "BYK-P104, P105 (high molecular weight unsaturated polycarboxylic acid) (High molecular weight polycarboxylic acid), 6220 (fatty acid polyester), 6745 (phthalocyanine derivative), 6750 (azo), 4300 (block copolymer), 4400, 4402 (modified polyacrylate), 5010 Pigment derivative) &quot;, Ajinomoto Fine-Techno Co., Inc. Product "Ajisper-PB821, PB822", Kyoeisha Chemical Co., Ltd. Product "Fullerene TG-710 (urethane oligomer)", "Polyflow No." 50E, No. 300 (acrylic copolymer) ", Kusumoto Chemicals, Ltd. 703-50, DA-705, DA-725 &quot;, manufactured by Kao Corporation &quot; DERSPARON KS-860, 873SN, 874, # 2150 (aliphatic polycarboxylic acid), # 7004 (polyetherester) &Quot; Homogenol L-18 (Polymer Polycarboxylic Acid) &quot;, &quot; Emulgen 920, 930, &quot; 935, 985 (polyoxyethylene nonylphenyl ether) "," acetamin 86 (stearylamine acetate) ", the product of The Lubrizol Corporation" Solspers 5000 (phthalocyanine derivative), 22000 (azo pigment derivative) ), 3000, 17000, 27000 (polymer having a functional part at the terminal), 24000, 28000, 32000, 38500 (graft polymer) ", Nikko Chemicals Co., Ltd. Product "Nicole T106 (polyoxyethylene sorbitan monooleate), MYS-IEX (polyoxyethylene monostearate)", and the like. As another dispersing resin, a compound represented by the formula (ED) hereinafter referred to as Japanese Patent Laid-Open Publication No. 2012-208494 (corresponding to [0692] of U.S. Patent Application Publication No. 2012/235099) ) May be used as an essential monomer component, and the contents thereof are included in the specification of the present invention. As specific examples of the ether dimer, reference may be made to the description of the ether dimer of Japanese Patent Laid-Open Publication No. 2012-208494, paragraph 0565 (corresponding US Patent Application Publication No. 2012/235099 [0694]), . Specific examples of the polymer obtained by polymerizing the compound represented by the formula (ED) as an essential monomer component include a specific example of a polymer obtained by polymerizing a compound represented by the following formula (ED) as an essential monomer component in a part of the binder polymer and The same thing is listed. These other resins may be used alone or in combination of two or more.

The concentration of the polymer compound (dispersion resin) (B) relative to the total solid content of the dispersion composition of the present invention is preferably in the range of 5 to 40 mass%, more preferably in the range of 10 to 35 mass% , And more preferably in the range of 12 to 30 mass%.

&Lt; (C) Solvent >

The dispersion composition of the present invention includes a solvent, but the solvent may be composed of various organic solvents.

As the organic solvent usable here, the same materials as the above-mentioned dispersion compositions I and II can be used, and the preferable range is also the same.

The method for producing the dispersion composition of the present invention is not particularly limited, and a commonly used method for producing a dispersion composition can be applied. For example, by mixing the metal oxide particles (A), the polymer compound (B), and the solvent (C) and dispersing the mixture using a circulating dispersing device (bead mill) or the like.

The curable composition of the present embodiment is preferably filtered with a filter for the purpose of removing impurities or reducing defects. And those conventionally used for filtration applications and the like can be used without particular limitation. For example, a fluororesin such as PTFE (polytetrafluoroethylene), a polyamide resin such as nylon-6 or nylon-6,6, a polyolefin resin such as polyethylene or polypropylene (PP) And the like). Of these materials, polypropylene (including high-density polypropylene) is preferable.

The diameter of the filter is preferably about 0.01 to 7.0 占 퐉, preferably about 0.01 to 2.5 占 퐉, and more preferably about 0.01 to 1.5 占 퐉. Within this range, it is possible to reliably remove fine foreign matter which is mixed into the dissolved pigment or the like, which inhibits the preparation of a uniform and smooth curable composition in the subsequent step.

When a filter is used, other filters may be combined. At this time, the filtering in the first filter may be performed once or two or more times. In the case of filtering two or more times by combining other filters, it is preferable that the second or larger diameter is larger than the first filtering diameter. Further, the first filters having different diameters may be combined within the above-described range. The aperture here can refer to the nominal value of the filter maker. As a commercially available filter, for example, various filters can be selected from Pall Corporation, Adventec Toyo Roshi Kaisha, Ltd., Nihon Entegris Co., Ltd. (formerly Mykrolis Corproation), or Kits Micro Filter Corporation.

The second filter may be formed of the same material as the first filter described above. The diameter of the second filter is suitably about 0.5 to 7.0 mu m, preferably about 2.5 to 7.0 mu m, and more preferably about 4.5 to 6.0 mu m. With this range, it is possible to remove impurities that inhibit the preparation of a uniform and smooth curable composition in a subsequent step by mixing the component particles contained in the mixed solution with the mixed solution remaining therein.

For example, the filtering in the first filter may be performed only with the dispersion, and the second filtering may be performed after mixing the other components.

<Low Refractive Index Film>

The light-transmissive cured film in the present invention can be formed from a curable composition containing the specific low-refractive-index material and high-refractive-index material in a solvent.

The low refractive index film according to the present invention exhibits excellent low refractive index. Specifically, the refractive index of the low refractive index film is 1.5 or less, more preferably 1.46 or less, further preferably 1.43 or less, and particularly preferably 1.42 or less. The lower limit value is 1.3 or more, particularly preferably 1.32 or more. If it is within the above range, it is useful as an anti-reflection film to be described later. The anti-reflection film is preferably lower than the refractive index of an optical member (for example, an optical lens body or the like) to which the anti-reflection film is provided. Thus, an effective antireflection effect is obtained.

The Abbe number of the low refractive index film according to the present invention is 5 or more, preferably 10 or more, more preferably 15 or more, further preferably 17 or more, and particularly preferably 20 or more. The upper limit is 40 or less, preferably 38 or less, more preferably 35 or less, and particularly preferably 33 or less. By setting the Abbe number of the film within this range, compatibility with a high refractive index film (such as a microlens) that is commonly used is good, and a uniform anti-reflection effect is obtained over a wide range of visible light range.

The thickness of the low refractive index film is not particularly limited, but is preferably 0.025 占 퐉 or larger, more preferably 0.05 占 퐉 or larger, and still more preferably 0.075 占 퐉 or larger. The upper limit of the thickness is preferably 3 mu m or less, more preferably 2.5 mu m or less.

The thickness of the high-refractive-index film is not particularly limited, but is preferably 0.1 m or larger, more preferably 0.2 m or larger, and still more preferably 0.3 m or larger. The upper limit of the thickness is preferably 6 탆 or less, more preferably 4 탆 or less. A particularly preferable range when the lens body is used will be described later.

The refractive index, the Abbe number, and the thickness of the film are values measured by the measuring method employed in the later embodiment.

When the cured film is used as a low refractive index film, it is preferable to set the film thickness within this range because it is excellent in durability as a microlens unit and is excellent in adhesion with the cover glass even when used as a solid state image pickup device described below. In particular, in the case of thick application, it may exceed 1.0 mu m. Here, the film thickness refers to the thickness from the height of the longest point of the lens body.

&Lt; Optical member set &

As an example of the optical member set according to the preferred embodiment of the present invention, there is enumerated a structure in which other first optical member and second optical member are combined.

Hereinafter, the microlens unit is taken as an example of the optical member set, the light-transmitting cured film is taken as an example of the first optical member, and the micro lens body is taken as an example of the second optical member.

The microlens unit is assembled to the solid-state image sensor and has a micro-lens body and a light-transmissive cured film for covering the microlens body. Further, the words of the microlens body include the meaning of a microlens array, and are collectively referred to as lens members (lens members). When the microlens array is used as a microlens body, it is ideal that the groove portion, which is a gap between the microlens bodies, is filled in the light transmissive cured film without gaps and voids (voids) are not generated at all. In this configuration, the microlens unit does not generate void-derived noise in the light passing through the unit, and exhibits a good quality performance.

<First optical member>

As an example of the first optical member according to this embodiment, there is a light-transmissive curable film. The light transmissive curable film is composed of the cured film of the above-mentioned curable composition.

&Lt; Second optical member &

As an example of the second optical member according to the present embodiment, there is a micro lens body. The shape of the micro lens body is not particularly limited, but a convex lens is preferably used. In the present invention, a convex lens refers to a lens including a flat convex lens, a convex lens, a convex meniscus lens, and the like, and having at least a region expanded in one direction unless otherwise specified. Specific examples of the shape of the convex lens include a polyhedron, a spherical surface, and an aspheric surface (a shape without a spherical aberration formed by a free-form surface). The shape of the polyhedron includes a regular polyhedron, a semi-regular polyhedron, a cylindrical polyhedron, and a cylindrical doll. Further, when the light converging effect is obtained, a Fresnel lens or the like is included in the convex lens in the present invention.

In the present invention, the high refractive index film (lens body) is preferably made of a material exhibiting high refractive index. Specifically, the refractive index of the high refractive index film is preferably 1.7 or more, more preferably 1.8 or more. The upper limit is preferably 2 or less, and more preferably 1.95 or less. When the refractive index is in this range, it is possible to obtain a lens unit having good quality performance when used in combination with the above-described antireflection film (low refractive index film).

The Abbe's number of the high refractive index film is preferably 5 or more, more preferably 7 or more, and particularly preferably 10 or more, from the viewpoint of compatibility with the low refractive index film according to the present invention. The upper limit is preferably 90 or less, more preferably 80 or less, still more preferably 70 or less, even more preferably 50 or less, particularly preferably 40 or less.

As in the present embodiment, in the form in which the microlens body is used as a microlens array, it is preferable that the microlenses are arranged so as to extend in substantially the same direction. Here, the term &quot; array &quot; means that two or more elements are arranged at predetermined intervals, and the intervals may be uniform or different. Preferably, they are two-dimensionally arranged on one plane, and more preferably two-dimensionally arranged at equal intervals. The distance between the lenses (the distance between the centers of the lenses) is usually in the range of 100 to 1,000 nm, and in the case of densely arranged, the distance is more preferably 100 to 400 nm. Most of the concave portions are formed between the lenses. The shape of the lenses is determined by the shape of the bulged convex lens. A convex lens of an arc shape (a surface defined by an arc and a string) on the cross section is preferable, and a concave portion having a cross section composed of inverse arcs of two lines of V is formed.

The height (thickness) of the lens body is not particularly limited, but is practically 200 to 1000 nm. The width of the lens body is not particularly limited, but it is practically 70 to 80% with respect to the color filter size (for example, 980 to 1190 nm when the color filter size is 1400 nm). The height of the lens body refers to the height of the longest point of the lens body.

Further, when the lens body is a convex lens, the radius of curvature thereof is not particularly limited as long as it is within a range showing a desired effect.

&Lt; Manufacturing method of optical member set >

The embodiment of the optical member set in the present invention is not particularly limited and can be appropriately selected in accordance with the use and purpose. The following concrete examples are listed, but the present invention is not limited to these configurations. In the present specification, the term &quot; coating &quot; includes not only coating in direct contact with an object but also coating through another layer.

First Embodiment: A mode in which the second optical member is directly covered with the first optical member

Second Embodiment: A configuration in which a second optical member is coated with an overcoat layer and is further covered with a first optical member

Third Embodiment: A mode in which a layer of the first optical member is formed between the second optical member and the semiconductor light receiving unit

Of these, the first mode is preferable. Hereinafter, the manufacturing method of the first embodiment will be described in detail.

(Application of composition)

The curable composition of the present embodiment is preferably used as a material for forming an antireflection film or a low refractive index film. A method of applying the composition to a work such as a lens body to form a cured film is not particularly limited, but a well-known coating method can be applied. For example, a spin coating method, a dip coating method, a roller blade method, a spraying method, or the like can be applied. If necessary, the applied coating film is preferably subjected to heat treatment or the like to remove the solvent contained in the coated film.

The coating amount is a condition that the film thickness after curing is preferably 3 m or less, more preferably 2.5 m or less, and further preferably 2 m or less. The lower limit value is not particularly limited, but a condition of 0.1 mu m or more is preferable, a condition of 0.2 mu m or more is more preferable, and a condition of 0.5 mu m or more is particularly preferable. When the workpiece is, for example, a concavo-convex shape in which a plurality of convex lenses are arranged in the solid-state image pickup element, the gap width of the trench-like portion (the width of the middle thereof in the case of a V-shaped groove) is typically about 100 to 300 nm.

(Formation of cured film)

It is preferable to apply the resin composition for forming a light-transmissive cured film to a workpiece, and then remove the solvent to form a cured film. For this reason, the coating film after application is preferably performed under the conditions of 60 to 200 캜, more preferably 100 to 150 캜, preferably 1 to 10 minutes, and more preferably 1 to 5 minutes. The removal of the solvent may be carried out two or more times under different conditions.

In the present embodiment, it is preferable that the applied resin composition for forming a light-transmitting cured film is heated and further accelerated curing. By doing so, a more stable form can be realized and the developing property can be enhanced. The heating temperature is not particularly limited as long as the coating film is cured, but is preferably 150 to 400 ° C. Among them, 150 to 280 DEG C is preferable, and 150 to 240 DEG C is more preferable. The above-mentioned heating conditions are preferable, and the coating film is sufficiently cured, and a good film can be obtained. The heating time is not particularly limited, but is preferably 1 to 60 minutes, and more preferably 1 to 30 minutes. The heating method is not particularly limited, and heating by a hot plate, an oven, a furnace, or the like can be applied.

The atmosphere at the time of heating is not particularly limited, and an inert atmosphere, an oxidizing atmosphere, or the like can be applied. The inert atmosphere may be realized by an inert gas such as nitrogen, helium, or argon. The oxidizing atmosphere can be realized by a mixed gas of the inert gas and the oxidizing gas, and air may also be used. Examples of the oxidizing gas include oxygen, carbon monoxide, and oxygenated oxygen. The heating process can be carried out under pressure, under atmospheric pressure, under reduced pressure, or under vacuum.

The cured film obtained by the above heat treatment is mainly composed of organic silicon oxide (SiOC). As a result, even if there is a fine pattern, for example, the workpiece and the cured film can be etched with good precision, and it is possible to cope with the manufacturing process of a minute solid-state image pickup device.

(Antireflection film)

As a preferable use form of the cured film obtained by using the composition according to the present invention described above, an antireflection film is exemplified. In particular, it is preferable as an antireflection film for an optical device using a solid-state image sensor or the like, for example, a microlens for an image sensor, a plasma display panel, a liquid crystal display, an organic electroluminescence or the like. The reflectance when used as an antireflection film is preferably as low as possible. Concretely, the average reflectance of the specular surface in a wavelength region of 400 to 700 nm is preferably 3% or less, more preferably 2% or less, and most preferably 1% or less. The smaller the reflectance is, the more preferable it is, and particularly preferably 0. [

The haze of the antireflection film is preferably 3% or less, more preferably 1% or less, and particularly preferably 0.5% or less. The smaller the reflectance is, the better, and particularly preferably substantially zero.

<Solid-state image sensor>

A solid-state image pickup device according to a preferred embodiment of the present invention has a microlens unit on a semiconductor light receiving unit, and is assembled such that the microlens body and the color filter are in contact with each other. The light-receiving element receives light passing through the light-transmitting cured film, the lens body, and the color filter in this order, and functions as an image sensor. Specifically, the light-transmissive cured film functions as an antireflection film, and light condensing efficiency of the lens body is improved, and light collected efficiently by the lens body is detected by the light receiving element through the color filter. Since these functions over the entirety of the element detecting light corresponding to each of R, G and B, a very clear image can be obtained even when the light receiving element and the lens body are arranged at a high density.

As an example of a solid-state image pickup device to which a microlens array is applied, those described in JP-A-2007-119744 are enumerated. Specifically, a transfer electrode is provided between the CCD region formed on the surface of the semiconductor substrate and the photoelectric conversion portion, and a light shielding film is formed thereon through the interlayer film. On the light-shielding film, a transparent flattening film of a low refractive index such as an interlayer insulating film made of BPSG (Boro-Phospho-Silicate Glass) or the like, a passivation film and an acrylic resin is laminated, and a color filter in which R.G.B. And a plurality of microlenses are arranged so as to be positioned above the photoelectric conversion portion as a light receiving region through a protective film.

The microlens unit according to the preferred embodiment of the present invention preferably has the following configuration. That is, a plurality of convex lenses are applied as the micro lens body, the plurality of convex lenses are arranged so as to extend in the substantially same direction, and the plurality of convex lenses are covered from the bulge direction, Transmissive cured film, and the concave portion formed between the plurality of convex lenses is filled with the light-transmissive cured film substantially without gaps. On the other hand, in the light-transmissive cured film, the opposite side of the lens body is a flat surface .

In the present specification, &quot; substantially the same direction &quot; means that even if the bulge direction does not completely coincide, deviation such as inconsistency in direction in the bulge direction may be allowed within a range showing a desired effect. On the other hand, &quot; substantially no gap &quot; means that a small gap can be provided between the first optical member and the second optical member within a range that exhibits a desired effect.

The microlens unit in the present invention can be suitably used for other purposes than for the solid-state image pickup device. Examples of other uses include on-chip color filter imaging systems such as various OA devices, liquid crystal display devices such as liquid crystal televisions, cellular phones, and projectors, facsimile machines, electronic copying machines, and solid-state image pickup devices. Can be used.

(Example)

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples. In the present embodiment, &quot; part &quot; and &quot;% &quot; are on a mass basis unless otherwise specified.

&Lt; Low refractive index material &

(Synthesis of hydrolysis-condensation product)

A preparation example of the composition A02 is shown as a representative example. Hydrolysis / condensation reaction was carried out using methyltriethoxysilane. The solvent used at this time was ethanol. The obtained hydrolyzed condensate A-1 had a weight average molecular weight of about 10,000. The weight average molecular weight was confirmed by GPC according to the procedure described above. The following composition 1 was mixed with a stirrer to prepare a composition A02. Other compositions were prepared in the same manner as AO2 except that the components shown in Table A below were used.

(Composition 1)

Hydrolysis-condensation product (A-1) 10 copies

Propylene glycol monomethyl ether acetate (PGMEA) ... 72

Ethyl 3-ethoxypropionate (EEP) 18

EMULSOGEN-COL-020 (product of Clariant Japan) ... Part 2

SURLIA 2320 ... 25

(Application of composition)

The composition A02 obtained above was coated on a silicon wafer and then subjected to prebaking (100 占 폚 for 2 minutes) and post-baking (230 占 폚 for 10 minutes) to form a coating film.

[Evaluation of refractive index]

The refractive index of the obtained film was measured with an ellipsometer (VUV-vase [trade name] manufactured by J. A. Woollam) (wavelength: 633 nm, measurement temperature: 25 캜). Abbe number was calculated from the value of the refractive index similarly measured by the above-mentioned measuring apparatus. The calculation formula is as follows.

only,

n _D : Refraction index for D-line (589.3 nm) of Fraunhofer

n _F : Refraction index for F-line (486.1 nm) of Fraunhofer

n _C : Refraction index for C-line (656.3 nm) of Fraunhofer

(Table A)

<Tables>

Formulation amount:

Quot; other &quot; in the table. Test A10 means 100 parts of CYTOP

(Raw material of siloxane resin)

MTES ... Methyltriethoxysilane

TEOS ... Tetraethoxysilane

γ-GP-TMS: γ-glycidoxypropyltrimethoxysilane

TFP-TMS: Trifluoropropyltrimethoxysilane

TDFO-TMS: tridecafluorooctyltrimethoxysilane

(Surfactants)

EMUL-020 ... EMULSOGEN COL-020

(Anionic surfactant, product of Clariant K.K.)

(Fluororesin)

CYTOP: Product name · ASAHI GLASS CO., LTD. product

(Silica particles)

Sururia 2320

... Surulia 2320: JGC Catalysts and Chemicals Ltd. A 20 mass% dispersion of the hollow silica in the product

SD-L

... Snowtex MIBK-SD-L: 30 mass% dispersion of porous silica of Nissan Chemical Industries, Limited

ST

... Snowtex MIBK-ST: 20 mass% dispersion of porous silica of Nissan Chemical Industries, Limited

PL-1

... PL-1-IPA: FUSO CHEMICAL CO., LTD. A 12.5 mass% dispersion of the porous silica in the product

PL-2L

... PL-2L-PGME: FUSO CHEMICAL CO., LTD. A 20 mass% dispersion of the porous silica in the product

&Lt; High refractive index material &

[Preparation of titanium dioxide dispersion (dispersion composition)] [

As a circulating dispersing device (bead mill), a dispersion product of SHINMARU ENTERPRISES CORPORATION product was subjected to dispersion treatment as follows to obtain a dispersion of titanium dioxide as a dispersion composition.

~ Composition ~

Titanium dioxide (ISHIHARA SANGYO KAISHA, LTD., Product TTO-51 (C)): 150.0 parts

The following dispersion resin 1 (solid content 20% PGME A solution): 165.0 parts

Propylene glycol monomethyl ether acetate: 142.5 parts

The dispersing apparatus was operated under the following conditions.

· Bead diameter: φ0.05mm

· Beads filling rate: 60 vol%

· Speed: 10m / sec

· Pump feed rate: 30Kg / hour

· Cooling water: tap water

· Bead mill annular passage Contents: 1.0L

· Mixed liquid amount to be dispersed: 10 kg

After the initiation of dispersion, the average particle diameter was measured at intervals of 30 minutes (one pass time).

The average particle diameter decreased with the dispersion time (the number of passes), but the amount of change gradually decreased. Dispersion was terminated when the average particle diameter change when the dispersion time was extended for 30 minutes became 5 nm or less. The average particle size of the titanium dioxide particles in this dispersion was 40 nm.

The average particle size of the titanium dioxide particles contained in the obtained dispersion was 40 nm.

The average particle size of titanium dioxide and the like in this example was measured by diluting a mixed solution or dispersion containing titanium dioxide with propylene glycol monomethyl ether acetate 80 times and subjecting the resulting diluted solution to dynamic light scattering .

This measurement was performed by Nikkiso Co., Ltd. Product microtrack UPA-EX150.

[High refractive index material: preparation of titanium dioxide-containing curable composition B01]

· Titanium Dioxide Dispersion (dispersion composition) prepared above ... 80.5 parts

Solvent: propylene glycol monomethyl ether acetate ... Part 15

Polymerizable compound: KAYARAD DPHA (available from Nippon Kayaku Co., Ltd.) ... 3.6 part

· Polymerization initiator: IRGACURE OXE 01 (product name) from BASF ... 0.10 part

Polymer: Benzyl methacrylate / methacrylic acid copolymer

(Copolymerization ratio: 80/20 (mass%), weight average molecular weight: 12,000) (manufactured by FFFC)

                                                               ... 0.5 part

· Surfactant: Megafac F781 (manufactured by DIC Corporation) ... 0.30 part

[Formation of cured film]

The above-prepared titanium dioxide-containing curable composition was coated on a silicon wafer, followed by prebaking (100 占 폚 for 2 minutes) and post-baking (230 占 폚 for 10 minutes) to prepare a cured film B-1. The refractive index of this coating film was measured using an ellipsometry manufactured by J.A. Woollam · Japan, and the refractive index at 633 nm was 1.91.

The various titanium dioxide-containing curable compositions were prepared by the same procedures as those of the titanium dioxide-containing curable composition B-1 except that the ratio of the materials in the curable composition used was changed to the following composition ratio. The refractive index measurement results of the respective cured films are also described.

(Table B)

<Meaning of abbreviation>

Formulation amount:

JER-157S65 (trade name): Japan Epoxy Resins Co., Ltd. product

ZrO ₂ : Zirconium oxide (PCS manufactured by Nippon Denko Co., Ltd.)

The sample B03 was prepared as shown in Table B, except that titanium oxide was changed to zirconium oxide (PCS manufactured by Nippon Denko Co., Ltd.) with respect to the composition B01.

&Lt; Preparation of lower membrane &

The titanium dioxide-containing curable composition (B01) was coated on a glass substrate, and then subjected to prebaking (100 占 폚 for 2 minutes) and post-baking (230 占 폚 for 10 minutes) to prepare a base film D-1. The under film (high refractive film) had a refractive index of 1.91 and an Abbe number of 13.6. The thickness of the underlying film was 1.2 탆.

&Lt; Adjustment of Curable Composition >

A02 and B01 were mixed as follows to prepare a curable composition AB01.

· A02 ... 80 parts

· B01 ... 20 copies

The other curable compositions were prepared in the same manner as in AB01 except that the components shown in the following Table 1 were used.

&Lt; Preparation of cured film &

The curable composition AB01 prepared above was applied onto the base film D-1, and then subjected to prebaking (100 DEG C for 2 minutes) and post-baking (230 DEG C for 10 minutes) to form an antireflection low refractive index film. The thickness of the low refractive index film was 0.1 mu m.

[Evaluation of reflectance]

Hitachi, Ltd. The product was measured using a spectrophotometer U-4100. Light was incident in the direction of 5 degrees with respect to the vertical direction of the substrate and the intensity of the light reflected from the film was compared with the value of the blank not having the underlying film. The wavelengths were 450 nm, 550 nm and 650 nm. The results are shown in Table 1.

(Table 1-1)

(Table 1-2)

Test No .: If starting with &lt; RTI ID = 0.0 &gt; c &

Ac1 was prepared by changing the MTES 80 part and the TEOS 20 part to the MTES 100 part (Table A) with respect to the prescription of A01 except that PL-1 was not added.

Comparative Examples c12 and c13 are examples in which a low refractive index film is formed only by a low refractive index material in the table without mixing a low refractive index material and a high refractive index material. c14 to c16 are examples using commercial products.

MP1: manufactured by ASAHI GLASS CO., LTD. Product Saidot (trade name) [fluorinated resin]

MP2: OSTA JN (trade name) manufactured by JSR [fluorinated organic-inorganic hybrid material]

MP3: Defensa OP (trade name) manufactured by DIC Corporation [UV curable resin for optical use]

B05 was a ultra high refractive index, high heat-resistant coating material UR-202 (manufactured by NISSAN CHEMICAL INDUSTRIES, LTD.).

The low refractive index film (example) formed by the curable composition in the present invention realizes a desired refractive index and Abbe number, and exhibited good antireflection properties in a wide visible light region. From these results, it is confirmed that excellent optical performance is exhibited as an optical member such as a solid-state imaging element.

(Example 2)

(Titanium Dioxinate High Refractive Index Material Composition)

In order to form a layer having a refractive index (1.68), the following composition was prepared. In the case of using the composition C01 described below, pre-baking (100 DEG C for 2 minutes) and post-baking (230 DEG C for 10 minutes) are performed to form a cured film.

Solvent: propylene glycol monomethyl ether acetate ... Part 15

Cyclohexanone ... 30 copies

Resin: NISSAN CHEMICAL INDUSTRIES, LTD. Products Ultra High Refractive Coating Material UR202 ... 32

Curing accelerator: SB-A (Mitsubishi Gas Chemical Company, Inc.) ... Part 5

Epoxy resin: 157S65 (available from Mitsubishi Chemical Corporation) ... 17.5 parts

Surfactant: Megacack F-781 (DIC) ... 0.5 part

The above-mentioned high refractive index material C01 was used and the above-mentioned antireflection low refractive index film was formed as shown in Table 2 below. In either of the tests, it was confirmed that a good reflectance with no unevenness in the range of 450 to 650 nm was obtained.

(Table 2)

(Example 3)

Test specimen 301 was obtained in the same manner as Test Specimen 201 except that UR202 of high refractive index material C01 of Test Specimen 201 was changed to thioepoxy resin LPH1101 (manufactured by MITSUBISHI GAS CHEMICAL COMPANY, INC.). As with the specimen 101, the reflectance of the specimen 301 in the range of 450 to 650 nm was evaluated, and it was confirmed that it was a good result.

(Example 4)

A specimen 401 was obtained in the same manner as in Experiment 201 except that UR202 of high refractive index material C01 of Experiment 201 was changed to Episulfide Resin MR-174 (manufactured by Mitsui Chemicals, Inc.). For the test piece 401, the reflectance in the range of 450 to 650 nm was evaluated similarly to the test piece 101, and it was confirmed that the result was good.

(Example 5)

Test specimen 501 was obtained in the same manner as Test specimen 201 except that UR202 of high refractive index material C01 of specimen 201 was changed to thiourethane resin MR-7 (manufactured by Mitsui Chemicals, Inc.). As for the test piece 501, the reflectance in the range of 450 to 650 nm was evaluated in the same manner as in the test piece 101, and it was confirmed that it was a good result.

(Example 6)

The reflectance of each wavelength was measured in the same manner except that the thicknesses of the high refractive index film (base film) and the low refractive index film were changed as follows. As a result, it was confirmed that uniform antireflection performance was obtained in the visible light region as in Example 1.

--------------------

Test High Refractive Index Film Low Refractive Index Film

--------------------

101 1.2 占 퐉 0.1 占 퐉

601 1.5 占 퐉 0.15 占 퐉

602 0.75 탆 0.075 탆

603 1.25 탆 0.2 탆

604 2.0 탆 0.3 탆

--------------------

The thicknesses of the high refractive index film and the low refractive index film were measured as follows.

The thickness of the obtained film was measured by an ellipsometer (VUV-vase [trade name] manufactured by J. A. Woollam).

While the invention has been described in conjunction with the embodiments thereof, it is to be understood that the invention is not to be limited to any details of the description, nor is it intended to be limited to the spirit and scope of the invention as defined in the appended claims It should be interpreted extensively.

The present application claims the right based on the patent application No. 2012-192623, filed on August 31, 2012 in Japan, and the patent application No. 2013-054353 filed in Japan on Mar. 15, 2013, Incorporated herein by reference in its entirety.

Claims (17)

A low refractive index film having an Abbe number of 5 to 40 and a refractive index of 1.3 to 1.5,
Comprising a low refractive index material and a high refractive index material,
Wherein the low refractive index material comprises hollow particles or non-hollow particles,
Wherein the high refractive index material comprises a dispersion resin composed of titania or zirconia and a polymer compound. The method according to claim 1,
Wherein the low refractive index material has an Abbe number of 40 to 80 and a refractive index of 1.2 to 1.4 and the high refractive index material has an Abbe number of 5 to 40 and a refractive index of 1.6 to 2. 3. The method according to claim 1 or 2,
Wherein the low-refractive-index material comprises at least one of a siloxane resin and a fluorine-based resin. 4. The method according to any one of claims 1 to 3,
The dispersion resin contains a structural unit represented by any one of the following formulas (1) to (4), a repeating unit represented by the following formula (I-1) and a repeating unit represented by the formula (I- Or a polymer compound having a repeating unit represented by the formula (I-1) and a repeating unit represented by the formula (I-2a), or represented by the following formula (11).

[X ¹ , X ² , X ³ , X ⁴ and X ⁵ each independently represent a hydrogen atom or a monovalent organic group; W ¹ , W ² , W ³ And W ⁴ each independently represent an oxygen atom or NH. R ³ represents a branched or linear alkylene group. Y ¹ , Y ² , Y ³ and Y ⁴ are each independently a single bond or a divalent linking group. Z ¹ , Z ² , Z ³ and Z ⁴ are each independently a hydrogen atom or a monovalent substituent. n, m, p, and q each represent an integer of 1 to 500. j and k each independently represent an integer of 2 to 8; R ⁴ represents a hydrogen atom or a monovalent organic group]

[R ¹ and R ² each independently represent a hydrogen atom, a halogen atom or an alkyl group. a independently represents an integer of 1 to 5; * Represents a connection between repeating units. R ⁸ and R ⁹ are the same groups as R ¹ . L is a linking group relating to a single bond, an alkylene group, an alkenylene group, an arylene group, a heteroarylene group, an imino group, an ether group, a thioether group, a carbonyl group or a combination thereof. L ^a is a structural moiety that cyclically forms together with CR ⁸ CR ⁹ and N; X represents a group having a functional group having a pKa of 14 or less. And Y represents a side chain having 40 to 10,000 atoms.

[R ¹ represents an (m + n) linking group, and R ² represents a single bond or a divalent linking group. A ¹ represents a group having an acid, a urea group, a urethane group, a group having a radial oxygen atom, a group having a basic nitrogen atom, a phenol group, an alkyl group, an aryl group, a group having an alkyleneoxy group, an imide group, Represents a monovalent substituent having at least one group selected from the group consisting of a carbonyl group, an alkylaminocarbonyl group, a carboxylate group, a sulfonamide group, an alkoxysilyl group, an epoxy group, an isocyanate group and a hydroxyl group. n A ¹ and R ² may be the same or different, 5. The method according to any one of claims 1 to 4,
The dispersing resin may be,
Has a weight-average molecular weight of 5,000 or more, and a structural unit represented by any one of formulas (1) to (4)
A repeating unit represented by the formula (I-1) and a repeating unit represented by the formula (I-2), or a repeating unit represented by the formula (I-1) , The weight average molecular weight is 3,000 or more,
A low refractive index film characterized by having a weight average molecular weight of 1,000 or more when it is made of a polymer compound represented by formula (11). 6. The method according to any one of claims 1 to 5,
A surfactant, a polymerizable compound, and a polymer compound thereof. 7. The method according to any one of claims 1 to 6,
Wherein the low refractive index film is an antireflection film. An optical member comprising the low-refractive-index film according to any one of claims 1 to 7. 9. The method of claim 8,
Wherein the low refractive index film is formed by coating the surface of a light transmitting member having a refractive index higher than that of the low refractive index film. A solid-state imaging device comprising the optical member according to claim 8 or 9. Refractive index material exhibiting an Abbe number of 40 to 80 and a refractive index of 1.2 to 1.4, and a high refractive index material exhibiting an Abbe number of 5 to 40 and a refractive index of 1.6 to 2. The curable composition for forming a low-
Wherein the low refractive index material comprises hollow particles or non-hollow particles,
Wherein the high refractive index material comprises a dispersion resin composed of titania or zirconia and a high molecular compound. 12. The method of claim 11,
Wherein the low refractive index material comprises at least one of a siloxane resin and a fluorine resin. 13. The method according to claim 11 or 12,
The dispersion resin contains a structural unit represented by any one of the following formulas (1) to (4), a repeating unit represented by the following formula (I-1) and a repeating unit represented by the formula (I- Or a polymer compound represented by the following formula (11), which comprises a repeating unit represented by the formula (I-1) and a repeating unit represented by the formula (I-2a) Curable composition.

[X ¹ , X ² , X ³ , X ⁴ and X ⁵ each independently represent a hydrogen atom or a monovalent organic group; W ¹ , W ² , W ³ And W ⁴ each independently represent an oxygen atom or NH. R ³ represents a branched or linear alkylene group. Y ¹ , Y ² , Y ³ and Y ⁴ are each independently a single bond or a divalent linking group. Z ¹ , Z ² , Z ³ and Z ⁴ are each independently a hydrogen atom or a monovalent substituent. n, m, p, and q each represent an integer of 1 to 500. j and k each independently represent an integer of 2 to 8; R ⁴ represents a hydrogen atom or a monovalent organic group]

[R ¹ and R ² each independently represent a hydrogen atom, a halogen atom or an alkyl group. a independently represents an integer of 1 to 5; * Represents a connection between repeating units. R ⁸ and R ⁹ are the same groups as R ¹ . L is a linking group relating to a single bond, an alkylene group, an alkenylene group, an arylene group, a heteroarylene group, an imino group, an ether group, a thioether group, a carbonyl group or a combination thereof. L ^a is a structural moiety that cyclically forms together with CR ⁸ CR ⁹ and N; X represents a group having a functional group having a pKa of 14 or less. And Y represents a side chain having 40 to 10,000 atoms.

[R ¹ represents an (m + n) linking group, and R ² represents a single bond or a divalent linking group. A ¹ represents a group having an acid, a urea group, a urethane group, a group having a radial oxygen atom, a group having a basic nitrogen atom, a phenol group, an alkyl group, an aryl group, a group having an alkyleneoxy group, an imide group, Represents a monovalent substituent having at least one group selected from the group consisting of a carbonyl group, an alkylaminocarbonyl group, a carboxylate group, a sulfonamide group, an alkoxysilyl group, an epoxy group, an isocyanate group and a hydroxyl group. n A ¹ and R ² may be the same or different, 14. The method according to any one of claims 11 to 13,
The dispersing resin may be,
Has a weight-average molecular weight of 5,000 or more, and a structural unit represented by any one of formulas (1) to (4)
A repeating unit represented by the formula (I-1) and a repeating unit represented by the formula (I-2), or a repeating unit represented by the formula (I-1) , The weight average molecular weight is 3,000 or more,
A curable composition for forming a low refractive index film, which comprises a polymer compound represented by formula (11) and has a weight average molecular weight of 1,000 or more. 15. The method according to any one of claims 11 to 14,
Wherein the curable composition further comprises at least one of a surfactant, a polymerizable compound and a polymerizable compound thereof. A manufacturing method of an optical member set comprising a first optical member and a second optical member coated on the first optical member,
A process for preparing the curable composition for forming a low refractive index film according to any one of claims 11 to 15,
Applying the curable composition onto a second optical member,
And curing the curable composition to form a first optical member which is a low refractive index film. A method of producing a curable composition for forming a low refractive index film,
A first composition comprising a low refractive index material exhibiting an Abbe number of 40 to 80 and a refractive index of 1.2 to 1.4 and a second composition comprising an Abbe number of 5 to 40 and a high refractive index material exhibiting a refractive index of 1.6 to 2,
Wherein the first composition comprises hollow particles or non-hollow particles,
Wherein the second composition contains titania or a dispersion resin comprising zirconia and a polymer compound.