JP4899572B2 - Curable resin composition and antireflection film - Google Patents

Description

  The present invention relates to a curable resin composition and an antireflection film. More specifically, a curable resin composition containing an ethylenically unsaturated group-containing fluorine-containing polymer and capable of obtaining a cured product having excellent scratch resistance, coating property, and durability when cured, and The present invention relates to an antireflection film including a low refractive index layer made of such a cured product.

In various display panels such as liquid crystal display panels, cold cathode ray tube panels, plasma displays, etc., in order to prevent reflection of external light and improve image quality, it has low refractive index, scratch resistance, coatability, and durability. There is a need for an antireflection film including a low refractive index layer made of an excellent cured product.
In these display panels, the surface is often wiped with gauze impregnated with ethanol or the like in order to remove attached fingerprints, dust and the like, and scratch resistance is required.

As a material for a low refractive index layer of an antireflection film, for example, a fluororesin-based paint containing a hydroxyl group-containing fluoropolymer is known (for example, Patent Documents 1 to 3).
However, in such a fluororesin-based paint, it is necessary to heat and crosslink a hydroxyl group-containing fluoropolymer and a curing agent such as melamine resin under an acid catalyst in order to cure the coating film. Depending on the conditions, there are problems that the curing time becomes excessively long and the types of base materials that can be used are limited.
Moreover, although the obtained coating film was excellent in the weather resistance, there was a problem that it was poor in scratch resistance and durability.

  Therefore, in order to solve the above-mentioned problems, an isocyanate group-containing unsaturated compound having at least one isocyanate group and at least one addition polymerizable unsaturated group and a hydroxyl group-containing fluoropolymer are converted into an isocyanate group. A coating composition containing an unsaturated group-containing fluorine-containing vinyl polymer obtained by reacting at a ratio of number / hydroxyl number of 0.01 to 1.0 has been proposed (for example, Patent Document 4). .

However, in the above publication, when preparing the unsaturated group-containing fluorine-containing vinyl polymer, an isocyanate group-containing unsaturated compound in an amount sufficient to react all the hydroxyl groups of the hydroxyl group-containing fluorine-containing polymer is not used, Actively left unreacted hydroxyl groups in the polymer.
Therefore, a coating composition containing such a polymer can be cured at a low temperature in a short time, but is further cured using a curing agent such as a melamine resin in order to react the remaining hydroxyl groups. There was a need. Furthermore, the coating film obtained by the said gazette had the subject that it could not be said that coating property and abrasion resistance were sufficient.

  In addition, in order to improve the scratch resistance of the antireflection film, a technique of adding silica particles to a low refractive index film that is the outermost layer of the antireflection film is widely used (for example, Patent Documents 5 and 6).

Furthermore, in order to provide an antireflection film having a lower reflectivity, a material for a low refractive index film having a lower refractive index than before is desired. Therefore, by utilizing the fact that the refractive index of air is lower than that of a resin component such as acrylic, a technique using particles having voids inside the particles such as porous particles and hollow particles (hereinafter collectively referred to as hollow particles). Is known (for example, Patent Documents 7 to 9).
However, when hollow particles are used, there is a drawback that the scratch resistance of the cured film is reduced as compared with particles having no voids (solid particles).

JP 57-34107 A JP 59-189108 A JP 60-67518 A JP 61-296073 A JP 2002-265866 A JP-A-10-316860 JP 2003-139906 A JP 2002-317152 A JP-A-10-142402

  Therefore, an object of the present invention is to provide a curable resin composition and an antireflection film that provide a cured film having a low refractive index and excellent scratch resistance.

［式（１３）中、Ｒ^２４、Ｒ^２５はそれぞれ独立に炭素数１〜４のアルキル基を表し、Ｒ^２６は水酸基又は炭素数１〜４のアルキル基を表し、Ｒ^２７は水素原子又はメチル基を表す。］
を含有する硬化性樹脂組成物。
２．前記（Ｂ）（メタ）アクリレート化合物が、分子内に少なくとも２個以上の（メタ）アクリロイル基を含有する化合物を含有することを特徴とする上記１に記載の硬化性樹脂組成物。
３．前記（Ｃ）シリカを主成分とする粒子が、重合性不飽和基を含む有機化合物によって表面処理がなされている上記１又は２に記載の硬化性樹脂組成物。
４．反射防止膜用である上記１〜３のいずれかに記載の硬化性樹脂組成物。
５．上記１〜４のいずれかに記載の硬化性樹脂組成物を硬化させて得られる硬化膜。
６．上記５に記載の硬化物からなる低屈折率層を有する反射防止膜。 In order to achieve the above object, the present inventors have intensively studied, and by using a polymer polymerization initiator in place of the conventionally used low molecular weight polymerization initiator, the obtained cured film has a steel wool resistance and The present inventors have found that the scratch resistance such as ethanol resistance can be improved and completed the present invention.
According to the present invention, the following curable resin composition and antireflection film are provided.
1. The following components (A), (B), (C) and (D):
(A) an ethylenically unsaturated group-containing fluoropolymer,
(B) (meth) acrylate compound,
(C) particles mainly composed of silica having a number average particle diameter of 1 to 100 nm,
(D) Photopolymerization initiator having a structure represented by the following formula (13)

[In Formula (13), R ²⁴ and R ²⁵ each independently represents an alkyl group having 1 to 4 carbon atoms, R ²⁶ represents a hydroxyl group or an alkyl group having 1 to 4 carbon atoms, and R ²⁷ represents a hydrogen atom or methyl. Represents a group. ]
A curable resin composition containing
2. 2. The curable resin composition according to 1 above, wherein the (B) (meth) acrylate compound contains a compound containing at least two (meth) acryloyl groups in the molecule.
3. 3. The curable resin composition according to 1 or 2 above, wherein the particles containing (C) silica as a main component are surface-treated with an organic compound containing a polymerizable unsaturated group.
4). The curable resin composition according to any one of 1 to 3 above, which is used for an antireflection film.
5. The cured film obtained by hardening the curable resin composition in any one of said 1-4.
6). 6. An antireflection film having a low refractive index layer comprising the cured product as described in 5 above.

According to the curable resin composition of the present invention, a cured film excellent in scratch resistance such as low refractive index, steel wool resistance and ethanol resistance can be obtained.
Moreover, according to the present invention, an antireflection film having a low refractive index and excellent scratch resistance can be obtained.

  Embodiments of the curable resin composition of the present invention (hereinafter sometimes referred to as the composition of the present invention) and the antireflection film will be described below.

1. Curable resin composition The composition of this invention may contain the following component (A)-(F). Among these components, (A) to (D) are essential components, and (E) to (F) are optional components that can be appropriately contained.
(A) ethylenically unsaturated group-containing fluorine-containing polymer (B) (meth) acrylate compound (C) particles whose main component is silica having a number average particle size of 1 to 100 nm,
(D) Photopolymerization initiator having a specific structure (E) Organic solvent (F) Other additives These components will be described below.

(A) Ethylenically unsaturated group-containing fluorinated polymer The ethylenically unsaturated group-containing fluorinated polymer (A) is a polymer of a fluorinated olefin. By the component (A), the composition of the present invention exhibits basic performance as a low refractive index material for an antireflection film such as low refractive index, antifouling property, chemical resistance, and water resistance.
Preferably, in the component (A), the side chain hydroxyl group is modified with a (meth) acrylic compound. More preferably, it is modified with a (meth) acrylic compound having an isocyanate group. By such modification, it is possible to co-crosslink with the radically polymerizable component (B) (meth) acrylate compound, and the scratch resistance is improved.

  The ethylenically unsaturated group-containing fluorine-containing polymer comprises an isocyanate group / hydroxyl molar ratio of a compound containing one isocyanate group, at least one ethylenically unsaturated group, and a hydroxyl group-containing fluorine-containing polymer. Is preferably obtained by reacting at a ratio of 0.2 to 1.5. However, the ethylenically unsaturated group-containing fluoropolymer used in the present invention is not limited to those produced by this production method. For example, a hydroxyl group-containing fluoropolymer is acrylic acid in the presence of a basic compound. Alternatively, it may be produced by reacting with acrylic acid chloride.

(1) A compound containing one isocyanate group and at least one ethylenically unsaturated group As a compound containing one isocyanate group and at least one ethylenically unsaturated group, The compound is not particularly limited as long as it is a compound containing one isocyanate group and at least one ethylenically unsaturated group.
In addition, when two or more isocyanate groups are contained, there is a possibility of causing gelation when reacting with a hydroxyl group-containing fluoropolymer.
Moreover, since the composition of this invention mentioned later can be hardened more easily as said ethylenically unsaturated group, the compound which has a (meth) acryloyl group is more preferable.
As such a compound, 2- (meth) acryloyloxyethyl isocyanate and 2- (meth) acryloyloxypropyl isocyanate may be used singly or in combination of two or more.

Such a compound can also be synthesized by reacting diisocyanate and a hydroxyl group-containing (meth) acrylate.
As examples of diisocyanates, 2,4-tolylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, methylene bis (4-cyclohexyl isocyanate), and 1,3-bis (isocyanate methyl) cyclohexane are preferred.

As examples of the hydroxyl group-containing (meth) acrylate, 2-hydroxyethyl (meth) acrylate and pentaerythritol tri (meth) acrylate are preferable.
In addition, as a commercial item of a hydroxyl-containing polyfunctional (meth) acrylate, for example, Osaka Organic Chemical Co., Ltd. product name HEA, Nippon Kayaku Co., Ltd. product name KAYARAD DPHA, PET-30, Toagosei Co., Ltd. Product name Aronix M-215, M-233, M-305, M-400 and the like can be obtained.

(2) Hydroxyl group-containing fluorine-containing polymer The hydroxyl group-containing fluorine-containing polymer preferably comprises the following structural units (a), (b) and (c), and the structural units (a), (b) And the sum total of the weight of (c) occupies 80 weight% or more of a hydroxyl-containing fluoropolymer.
(A) A structural unit represented by the following formula (1).
(B) A structural unit represented by the following formula (2).
(C) A structural unit represented by the following formula (3).

［式（１）中、Ｒ¹はフッ素原子、フルオロアルキル基又は−ＯＲ²で表される基（Ｒ²はアルキル基又はフルオロアルキル基を示す）を示す］

[In formula (1), R ¹ represents a fluorine atom, a fluoroalkyl group or a group represented by —OR ² (R ² represents an alkyl group or a fluoroalkyl group)]

［式（２）中、Ｒ³は水素原子又はメチル基を、Ｒ⁴はアルキル基、−Ｏ(ＣＨ₂)_xＲ⁵、または−ＯＣＯＲ⁵で表される基（Ｒ⁵はアルキル基、フルオロアルキル基、又はグリシジル基を、ｘは０〜２の数を示す）、カルボキシル基又はアルコキシカルボニル基を示す］

[In the formula (2), R ³ represents a hydrogen atom or a methyl group, R ⁴ represents an alkyl group, a group represented by —O (CH ₂ ) _x R ⁵ , or —OCOR ⁵ (R ⁵ represents an alkyl group, fluoro An alkyl group or a glycidyl group, x represents a number of 0 to 2), a carboxyl group or an alkoxycarbonyl group]

［式（３）中、Ｒ⁶は水素原子又はメチル基を、Ｒ⁷は水素原子又はヒドロキシアルキル基を、ｖは０〜２の数を示す］

[In formula (3), R ⁶ represents a hydrogen atom or a methyl group, R ⁷ represents a hydrogen atom or a hydroxyalkyl group, and v represents a number of 0 to 2.]

(I) Structural unit (a)
In the above formula (1), examples of the fluoroalkyl group represented by R ¹ and R ² include a trifluoromethyl group, a perfluoroethyl group, a perfluoropropyl group, a perfluorobutyl group, a perfluorohexyl group, a perfluorocyclohexyl group, and the like. A C1-C6 fluoroalkyl group is mentioned. The alkyl group R ^2, a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group, an alkyl group having 1 to 6 carbon atoms such as a cyclohexyl group.

The structural unit (a) can be introduced by using a fluorine-containing vinyl monomer as a polymerization component. Such a fluorine-containing vinyl monomer is not particularly limited as long as it is a compound having at least one polymerizable unsaturated double bond and at least one fluorine atom. Examples thereof include fluororefines such as tetrafluoroethylene, hexafluoropropylene and 3,3,3-trifluoropropylene; alkyl perfluorovinyl ethers or alkoxyalkyl perfluorovinyl ethers; perfluoro (methyl vinyl ether), perfluoro Perfluoro (alkyl vinyl ethers) such as (ethyl vinyl ether), (propyl vinyl ether), perfluoro (butyl vinyl ether), perfluoro (isobutyl vinyl ether); Perfluoro (alkoxyalkyl vinyl ether) s such as perfluoro (propoxypropyl vinyl ether) These may be used alone or in combination of two or more.
Among these, hexafluoropropylene and perfluoro (alkyl vinyl ether) or perfluoro (alkoxyalkyl vinyl ether) are more preferable, and it is more preferable to use these in combination.

In addition, the content rate of a structural unit (a) is 40-60 mol% when the total amount of the structural units (a)-(c) in a hydroxyl-containing fluoropolymer is 100 mol%. The reason for this is that when the content is less than 40 mol%, it may be difficult to develop a low refractive index, which is an optical characteristic of the fluorine-containing material intended by the present invention, whereas If the rate exceeds 60 mol%, the solubility of the hydroxyl group-containing fluoropolymer in the organic solvent, transparency, or adhesion to the substrate may be lowered.
For this reason, the content of the structural unit (a) is more preferably 45 to 55 mol%.

(Ii) Structural unit (b)
In the formula (2), the alkyl group of R ⁴ or R ^{5 is} an alkyl group having 1 to 12 carbon atoms such as a methyl group, an ethyl group, a propyl group, a hexyl group, a cyclohexyl group or a lauryl group, or a hydrogen atom of these substituents. Examples of the alkoxycarbonyl group include a methoxycarbonyl group and an ethoxycarbonyl group.

  The structural unit (b) can be introduced by using the above-mentioned vinyl monomer having a substituent as a polymerization component. Examples of such vinyl monomers include methyl vinyl ether, ethyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether, n-butyl vinyl ether, isobutyl vinyl ether, tert-butyl vinyl ether, n-pentyl vinyl ether, n-hexyl vinyl ether, n -Alkyl vinyl ethers or cycloalkyl vinyl ethers such as octyl vinyl ether, n-dodecyl vinyl ether, 2-ethylhexyl vinyl ether, cyclohexyl vinyl ether; allyl ethers such as ethyl allyl ether, butyl allyl ether; vinyl acetate, vinyl propionate, vinyl butyrate, pivalin Carboxylic acid vinyl ester such as vinyl acid vinyl, vinyl caproate, vinyl vinyl versatate, vinyl stearate Tellurium; methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 2- ( (Meth) acrylic acid esters such as n-propoxy) ethyl (meth) acrylate; (meth) acrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid and other unsaturated carboxylic acids, etc. The combination of is mentioned.

In addition, the content rate of a structural unit (b) is 0-40 mol% when the total amount of the structural units (a)-(c) in a hydroxyl-containing fluoropolymer is 100 mol%. This is because if the content exceeds 40 mol%, the hydroxyl group concentration in the hydroxyl group-containing fluoropolymer cannot be increased, and sufficient coating film hardness and solubility cannot be ensured.
For these reasons, the content of the structural unit (b) is more preferably 5 to 35 mol%, and further preferably 5 to 30 mol%.

(Iii) Structural unit (c)
In the formula (3), as the hydroxyalkyl group of R ⁷ , 2-hydroxyethyl group, 2-hydroxypropyl group, 3-hydroxypropyl group, 4-hydroxybutyl group, 3-hydroxybutyl group, 5-hydroxypentyl group , 6-hydroxyhexyl group.

The structural unit (c) can be introduced by using a hydroxyl group-containing vinyl monomer as a polymerization component. Examples of such hydroxyl group-containing vinyl monomers include 2-hydroxyethyl vinyl ether, 3-hydroxypropyl vinyl ether, 2-hydroxypropyl vinyl ether, 4-hydroxybutyl vinyl ether, 3-hydroxybutyl vinyl ether, 5-hydroxypentyl vinyl ether, Examples include hydroxyl group-containing vinyl ethers such as 6-hydroxyhexyl vinyl ether, hydroxyl group-containing allyl ethers such as 2-hydroxyethyl allyl ether, 4-hydroxybutyl allyl ether, and glycerol monoallyl ether, allyl alcohol, and the like.
Moreover, as a hydroxyl-containing vinyl monomer, in addition to the above, 2-hydroxyethyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, caprolactone (meth) acrylate, polypropylene Glycol (meth) acrylate or the like can be used.

The content of the structural unit (c) is 10 to 60 mol% when the total amount of the structural units (a) to (c) in the hydroxyl group-containing fluoropolymer is 100 mol%. preferable. The reason for this is that when the content is less than 10 mol%, the solubility of the hydroxyl group-containing fluoropolymer in the organic solvent may be reduced or sufficient hardness may not be obtained. This is because when the content exceeds 60 mol%, optical properties such as transparency and low reflectivity of the hydroxyl group-containing fluoropolymer may be deteriorated.
For these reasons, the content of the structural unit (c) is more preferably 15 to 55 mol%, and further preferably 20 to 50 mol%.

(Iv) Structural unit (d) and structural unit (e)
The hydroxyl group-containing fluoropolymer preferably further comprises the following structural unit (d).

  (D) A structural unit represented by the following formula (4).

［式（４）中、Ｒ⁸及びＲ⁹は、同一でも異なっていてもよく、水素原子、アルキル基、ハロゲン化アルキル基又はアリール基を示す］

[In formula (4), R ⁸ and R ⁹ may be the same or different and each represents a hydrogen atom, an alkyl group, a halogenated alkyl group or an aryl group]

In the formula (4), the alkyl group of R ⁸ or R ^{9 is} an alkyl group having 1 to 3 carbon atoms such as a methyl group, an ethyl group or a propyl group, and the halogenated alkyl group is a trifluoromethyl group or perfluoro group. C1-C4 fluoroalkyl groups, such as an ethyl group, a perfluoropropyl group, a perfluorobutyl group, etc., A phenyl group, a benzyl group, a naphthyl group etc. are each mentioned as an aryl group.

  The structural unit (d) can be introduced by using an azo group-containing polysiloxane compound having a polysiloxane segment represented by the formula (4). Examples of such azo group-containing polysiloxane compounds include compounds represented by the following formula (5).

［式（５）中、Ｒ¹⁰〜Ｒ¹³は、同一でも異なっていてもよく、水素原子、アルキル基又はシアノ基を示し、Ｒ¹⁴〜Ｒ¹⁷は、同一でも異なっていてもよく、水素原子又はアルキル基を示し、ｐ、ｑは１〜６の数、ｓ、ｔは０〜６の数、ｙは１〜２００の数、ｚは１〜２０の数を示す。］

[In the formula (5), R ^{10 to} R ¹³ may be the same or different and each represents a hydrogen atom, an alkyl group or a cyano group, and R ^{14 to} R ¹⁷ may be the same or different and represent a hydrogen atom. Alternatively, it represents an alkyl group, p and q are numbers 1 to 6, s and t are numbers 0 to 6, y is a number 1 to 200, and z is a number 1 to 20. ]

  When the compound represented by the formula (5) is used, the structural unit (d) is included in the hydroxyl group-containing fluoropolymer as a part of the structural unit (e).

  (E) A structural unit represented by the following formula (6).

［式（６）中、Ｒ¹⁰〜Ｒ¹³、Ｒ¹⁴〜Ｒ¹⁷、ｐ、ｑ、ｓ、ｔ及びｙは、上記式（５）と同じである。］

[In the formula (6), R ^{10 to} R ¹³ , R ^{14 to} R ¹⁷ , p, q, s, t, and y are the same as in the above formula (5). ]

In the formulas (5) and (6), examples of the alkyl group represented by R ^{10 to} R ¹³ include alkyl groups having 1 to 12 carbon atoms such as a methyl group, an ethyl group, a propyl group, a hexyl group, and a cyclohexyl group. Examples of the alkyl group of ^{14 to} R ¹⁷ include an alkyl group having 1 to 3 carbon atoms such as a methyl group, an ethyl group, and a propyl group.

  In the present invention, the azo group-containing polysiloxane compound represented by the above formula (5) is particularly preferably a compound represented by the following formula (7).

［式（７）中、ｙ及びｚは、上記式（５）と同じである。］

[In Formula (7), y and z are the same as the said Formula (5). ]

The content of the structural unit (d) is preferably 0.1 to 10% by weight when the total amount in the hydroxyl group-containing fluoropolymer is 100% by weight. The reason for this is that when the content is less than 0.1% by weight, the surface slipping property of the coated film after curing is lowered, and the scratch resistance of the coated film may be lowered. If it exceeds 10% by weight, the transparency of the hydroxyl group-containing fluorine-containing polymer is inferior, and when used as a coating material, repelling or the like is likely to occur during coating.
For these reasons, the content of the structural unit (d) is more preferably 0.1 to 8% by weight based on the total amount of the hydroxyl group-containing fluoropolymer, More preferably, it is weight%. For the same reason, the content of the structural unit (e) is desirably determined so that the content of the structural unit (d) contained therein is in the above range.

(V) Structural unit (f)
It is also preferred that the hydroxyl group-containing fluoropolymer further comprises the following structural unit (f).

  (F) A structural unit represented by the following formula (8).

［式（８）中、Ｒ¹⁸は乳化作用を有する基を示す］

[In formula (8), R ¹⁸ represents a group having an emulsifying action]

In the formula (8), the group having an emulsifying action of R ¹⁸ includes a group having both a hydrophobic group and a hydrophilic group, and the hydrophilic group having a polyether structure such as polyethylene oxide and polypropylene oxide. preferable.

  Examples of the group having such an emulsifying action include a group represented by the following formula (9).

［式（９）中、ｎは１〜２０の数、ｍは０〜４の数、ｕは３〜５０の数を示す］

[In Formula (9), n is a number from 1 to 20, m is a number from 0 to 4, and u is a number from 3 to 50]

  The structural unit (f) can be introduced by using a reactive emulsifier as a polymerization component. Examples of such reactive emulsifiers include compounds represented by the following formula (10).

［式（１０）中、ｎ、ｍ及びｕは、上記式（９）と同様である］

[In Formula (10), n, m, and u are the same as those in Formula (9) above]

The content of the structural unit (f) is preferably 0.1 to 20% by weight when the total amount of the hydroxyl group-containing fluoropolymer is 100% by weight. The reason for this is that when the content is less than 0.1% by weight, the solubility of the hydroxyl group-containing fluoropolymer in the solvent is improved, whereas when the content exceeds 20% by weight, the composition of the present invention is improved. This is because the tackiness does not increase excessively, the handling becomes easy, and the moisture resistance does not decrease even when used as a coating material.
For these reasons, the content of the structural unit (f) is more preferably 1 to 20% by weight, more preferably 5 to 15% by weight, based on the total amount of the hydroxyl group-containing fluoropolymer. Is more preferable.

(Vi) Molecular Weight The hydroxyl group-containing fluoropolymer preferably has a polystyrene-equivalent number average molecular weight of 5,000 to 500,000 measured by gel permeation chromatography using tetrahydrofuran as a solvent. The reason for this is that when the number average molecular weight is less than 5,000, the mechanical strength of the hydroxyl group-containing fluoropolymer may be lowered. On the other hand, when the number average molecular weight exceeds 500,000, it will be described later. This is because the viscosity of the composition of the present invention becomes high and thin film coating may be difficult.
For these reasons, the number average molecular weight in terms of polystyrene of the hydroxyl group-containing fluoropolymer is more preferably 10,000 to 300,000, and even more preferably 10,000 to 100,000.

(3) Reaction molar ratio The ethylenically unsaturated group-containing fluoropolymer is the above-described compound containing one isocyanate group and at least one ethylenically unsaturated group, and a hydroxyl group-containing fluoropolymer. Are preferably obtained by reacting at a molar ratio of isocyanate group / hydroxyl group of 0.2 to 1.5. The reason for this is that if the molar ratio is less than 0.2, the scratch resistance and durability may be reduced. On the other hand, if the molar ratio exceeds 1.5, the coating film of the composition of the present invention has a problem. This is because the scratch resistance after immersion in an alkaline aqueous solution may be lowered.
For this reason, the molar ratio of isocyanate group / hydroxyl group is preferably 0.2 to 1.3, and more preferably 0.5 to 1.3.

The amount of component (A) added is not particularly limited, but is usually 10 to 80% by weight based on the total amount of the composition other than the organic solvent. The reason for this is that when the addition amount is less than 10% by weight, the refractive index of the cured coating film of the composition of the present invention increases, and a sufficient antireflection effect may not be obtained. If the amount exceeds 80% by weight, the scratch resistance of the cured coating film of the composition of the present invention may not be obtained.
For these reasons, the amount of component (A) added is more preferably 15 to 75% by weight, and even more preferably 20 to 70% by weight.

(B) (Meth) acrylate Compound The (meth) acrylate compound is used for enhancing the scratch resistance of a cured product obtained by curing the composition of the present invention and an antireflection film using the cured product.

The (meth) acrylate compound is not particularly limited as long as it is a compound containing at least one (meth) acryloyl group in the molecule.
Examples of the monomer having one (meth) acryloyl group include acrylamide, (meth) acryloylmorpholine, 7-amino-3,7-dimethyloctyl (meth) acrylate, isobutoxymethyl (meth) acrylamide, and isobornyloxyethyl. (Meth) acrylate, isobornyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, ethyldiethylene glycol (meth) acrylate, t-octyl (meth) acrylamide, diacetone (meth) acrylamide, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (Meth) acrylate, lauryl (meth) acrylate, dicyclopentadiene (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, dicyclopente (Meth) acrylate, N, N-dimethyl (meth) acrylamide tetrachlorophenyl (meth) acrylate, 2-tetrachlorophenoxyethyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, tetrabromophenyl (meth) acrylate, 2 -Tetrabromophenoxyethyl (meth) acrylate, 2-trichlorophenoxyethyl (meth) acrylate, tribromophenyl (meth) acrylate, 2-tribromophenoxyethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2- Hydroxypropyl (meth) acrylate, vinylcaprolactam, N-vinylpyrrolidone, phenoxyethyl (meth) acrylate, butoxyethyl (meth) acrylate, pentachloropheny Compounds represented by (meth) acrylate, pentabromophenyl (meth) acrylate, polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, bornyl (meth) acrylate, methyltriethylenediglycol (meth) acrylate It can be illustrated. Of these monofunctional monomers, isobornyl (meth) acrylate, lauryl (meth) acrylate, and phenoxyethyl (meth) acrylate are particularly preferable.

  As a commercial item of these monofunctional monomers, for example, Aronix M-101, M-102, M-111, M-113, M-117, M-152, TO-1210 (above, manufactured by Toagosei Co., Ltd.) ), KAYARAD TC-110S, R-564, R-128H (above, Nippon Kayaku Co., Ltd.), Biscote 192, Biscote 220, Biscote 2311HP, Biscote 2000, Biscote 2100, Biscote 2150, Biscote 8F, Biscote 17F (above , Osaka Organic Chemical Industry Co., Ltd.).

  Examples of the monomer having two or more (meth) acryloyl groups include ethylene glycol di (meth) acrylate, dicyclopentenyl di (meth) acrylate, triethylene glycol diacrylate, tetraethylene glycol di (meth) acrylate, Tricyclodecanediyldimethylene di (meth) acrylate, tris (2-hydroxyethyl) isocyanurate di (meth) acrylate, tris (2-hydroxyethyl) isocyanurate tri (meth) acrylate, caprolactone-modified tris (2-hydroxyethyl) Isocyanurate tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, ethylene oxide (hereinafter referred to as “EO”) modified trimethylolpropane tri (meth) acrylate, Pyrene oxide (hereinafter referred to as “PO”) modified trimethylolpropane tri (meth) acrylate, tripropylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, both ends (meth) acrylic of bisphenol A diglycidyl ether Acid adduct, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, polyester di (meth) acrylate , Polyethylene glycol di (meth) acrylate, dipentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol tetra (meth) acrylate Rate, caprolactone modified dipentaerythritol hexa (meth) acrylate, caprolactone modified dipentaerythritol penta (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, EO modified bisphenol A di (meth) acrylate, PO modified bisphenol A di (meta) ) Acrylate, EO-modified hydrogenated bisphenol A di (meth) acrylate, PO-modified hydrogenated bisphenol A di (meth) acrylate, EO-modified bisphenol F di (meth) acrylate, (meth) acrylate of phenol novolac polyglycidyl ether, etc. can do.

  Examples of commercially available products of these polyfunctional monomers include SA1002 (manufactured by Mitsubishi Chemical Corporation), biscoat 195, biscoat 230, biscoat 260, biscoat 215, biscoat 310, biscoat 214HP, biscoat 295, biscoat 300, Biscoat 360, Biscoat GPT, Biscoat 400, Biscoat 700, Biscoat 540, Biscoat 3000, Biscoat 3700 (manufactured by Osaka Organic Chemical Industry Co., Ltd.), Kayarad R-526, HDDA, NPGDA, TPGDA, MANDA, R-551, R-712, R-604, R-684, PET-30, GPO-303, TMPTA, THE-330, DPHA, DPHA-2H, DPHA-2C, DPHA-2I, D-310, D-330, DPCA 20, DPCA-30, DPCA-60, DPCA-120, DN-0075, DN-2475, T-1420, T-2020, T-2040, TPA-320, TPA-330, RP-1040, RP-2040, R-011, R-300, R-205 (manufactured by Nippon Kayaku Co., Ltd.), Aronix M-210, M-220, M-233, M-240, M-215, M-305, M- 309, M-310, M-315, M-325, M-400, M-6200, M-6400 (above, manufactured by Toagosei Co., Ltd.), light acrylate BP-4EA, BP-4PA, BP-2EA, BP-2PA, DCP-A (manufactured by Kyoeisha Chemical Co., Ltd.), New Frontier BPE-4, BR-42M, GX-8345 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), ASF 400 (above, manufactured by Nippon Steel Chemical Co., Ltd.), Lipoxy SP-1506, SP-1507, SP-1509, VR-77, SP-4010, SP-4060 (above, Showa Polymer Co., Ltd.), NK ester A-BPE-4 (manufactured by Shin-Nakamura Chemical Co., Ltd.).

  Of these, the composition of the present invention preferably contains a compound containing at least two (meth) acryloyl groups in the molecule. More preferably, a compound containing at least 3 (meth) acryloyl groups in the molecule is particularly preferable. The three or more compounds can be selected from the tri (meth) acrylate compounds exemplified above, tetra (meth) acrylate compounds, penta (meth) acrylate compounds, hexa (meth) acrylate compounds, and the like. Of these, trimethylolpropane tri (meth) acrylate, EO-modified trimethylolpropane tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth) acrylate, ditrimethylolpropane tetra (meth) Acrylate is particularly preferred. Each of the above compounds may be used alone or in combination of two or more.

  Further, the (meth) acrylate compound may contain fluorine. Examples of such a compound include one kind alone or a combination of two or more kinds such as perfluorooctylethyl (meth) acrylate, octafluoropentyl (meth) acrylate, and trifluoroethyl (meth) acrylate.

The amount of component (B) added is not particularly limited, but is usually 1 to 70% by weight with respect to the total amount of the composition other than the organic solvent. The reason for this is that when the addition amount is less than 1% by weight, the scratch resistance of the cured coating film of the composition of the present invention may not be obtained, whereas when the addition amount exceeds 70% by weight, This is because the refractive index of the cured coating film of the composition of the present invention becomes high and a sufficient antireflection effect may not be obtained.
For this reason, the amount of component (B) added is more preferably 1 to 60% by weight, and even more preferably 1 to 40% by weight.

(C) Particles whose main component is silica having a number average particle diameter of 1 to 100 nm (1) Particles whose main component is silica The composition of the present invention is mainly composed of silica having a number average particle size of 1 to 100 nm. Blend particles (C). In addition, the particle | grains which have a silica as a main component may use the thing of one type of number average particle diameter, and may use it combining the thing of two or more types of number average particle diameter. When two or more kinds of particles having different particle diameters are used, a cured film having a high filling rate of the particles in the cured product is obtained, and a cured film having a higher scratch resistance (low refractive index film) is obtained. it is conceivable that.
As the two or more kinds of particles, there are two kinds of particles (C1) mainly composed of silica having a number average particle diameter of 1 to 30 nm and particles (C2) mainly composed of silica having a number average particle diameter of 40 to 100 nm. It is preferable to blend particles. The particle size is measured with a transmission electron microscope.
Particles (C1) containing silica having a number average particle diameter of 1 to 30 nm as a main component contribute to improving the scratch resistance of the cured product of the composition of the present invention, particularly the steel wool resistance.
Particles (C1) containing silica having a number average particle size of 40 to 100 nm as a main component contribute to developing a low refractive index and scratch resistance in the cured product of the composition of the present invention.

Moreover, when the silica particle to be used is a hollow particle or a porous particle, or when two or more kinds of particles are used, by making either or both of the component (C1) and the component (C2) hollow particles, A cured film having a low refractive index is obtained. In particular, by combining the solid particles of the component (C1) and the hollow particles of the component (C2), the scratch resistance can be improved while reducing the refractive index.
Further, by making the particle component (C) photocrosslinkable, it is possible to further improve the scratch resistance.

  As these particles mainly composed of silica, known particles can be used, and if the shape is spherical, not only ordinary colloidal silica but also hollow particles, porous particles, core-shell particles And so on. However, from the viewpoint of reducing the refractive index of the cured film obtained from the composition of the present invention, hollow particles and porous particles are preferable, and either or both of the components (C) and (D) are hollow particles. Particularly preferred. Moreover, it is not limited to a spherical shape, and may be an irregularly shaped particle. Colloidal silica having a solid content of 10 to 40% by weight is preferred.

The dispersion medium is preferably water or an organic solvent. Examples of organic solvents include alcohols such as methanol, isopropyl alcohol, ethylene glycol, butanol and ethylene glycol monopropyl ether; ketones such as methyl ethyl ketone and methyl isobutyl ketone; aromatic hydrocarbons such as toluene and xylene; dimethylformamide and dimethyl Examples include amides such as acetamide and N-methylpyrrolidone; esters such as ethyl acetate, butyl acetate and γ-butyrolactone; and organic solvents such as ethers such as tetrahydrofuran and 1,4-dioxane. Of these, alcohols and ketones are preferred. These organic solvents can be used alone or in combination of two or more as a dispersion medium.
As a commercial item of the particle | grains which have a silica as a main component, as a colloidal silica, for example, Nissan Chemical Industries Ltd. brand name: Methanol silica sol, IPA-ST, MEK-ST, MEK-ST-S, MEK-ST- L, IPA-ZL, NBA-ST, XBA-ST, DMAC-ST, ST-UP, ST-OUP, ST-20, ST-40, ST-C, ST-N, ST-O, ST-50, ST-OL etc. can be mentioned.

Moreover, what carried out surface treatments, such as chemical modification, on the colloidal silica surface can be used, for example, a hydrolyzable silicon compound having one or more alkyl groups in the molecule or one containing a hydrolyzate thereof. Can be reacted. Such hydrolyzable silicon compounds include trimethylmethoxysilane, tributylmethoxysilane, dimethyldimethoxysilane, dibutyldimethoxysilane, methyltrimethoxysilane, butyltrimethoxysilane, octyltrimethoxysilane, dodecyltrimethoxysilane, 1,1. , 1-trimethoxy-2,2,2-trimethyl-disilane, hexamethyl-1,3-disiloxane, 1,1,1-trimethoxy-3,3,3-trimethyl-1,3-disiloxane, α-trimethylsilyl -Ω-dimethylmethoxysilyl-polydimethylsiloxane, α-trimethylsilyl-ω-trimethoxysilyl-polydimethylsiloxane hexamethyl-1,3-disilazane, and the like. A hydrolyzable silicon compound having one or more reactive groups in the molecule can also be used. Hydrolyzable silicon compounds having one or more reactive groups in the molecule are, for example, urea propyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyl having NH ₂ groups as reactive groups. Trimethoxysilane or the like having an OH group, bis (2-hydroxyethyl) -3aminotripropylmethoxysilane or the like having an isocyanate group, 3-isocyanatopropyltrimethoxysilane or the like having a thiocyanate group 3 As thiocyanate propyltrimethoxysilane and the like having an epoxy group (3-glycidoxypropyl) trimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane and the like having a thiol group 3 -Mercaptopropyltrimethoxy Sisilane etc. can be mentioned. A preferred compound is 3-mercaptopropyltrimethoxysilane.

  The particles (C) containing silica as a main component are preferably those that have been surface-treated with an organic compound containing a polymerizable unsaturated group (hereinafter sometimes referred to as “specific organic compound”). Such surface treatment enables co-crosslinking with the UV curable acrylic monomer (component (B)) and improves the scratch resistance.

(2) Specific organic compound The specific organic compound used in the present invention is a polymerizable compound containing a polymerizable unsaturated group in the molecule. This compound is a compound further containing a group represented by the following formula (11) in the molecule, and a compound having a silanol group in the molecule or a compound that generates a silanol group by hydrolysis. preferable.

［式（１１）中、ＸはＮＨ、Ｏ（酸素原子）又はＳ（イオウ原子）を示し、ＹはＯ又はＳを示す。］

[In the formula (11), X represents NH, O (oxygen atom) or S (sulfur atom), and Y represents O or S. ]

(I) Polymerizable unsaturated group The polymerizable unsaturated group contained in the specific organic compound is not particularly limited. For example, acryloyl group, methacryloyl group, vinyl group, propenyl group, butadienyl group, styryl group, ethynyl group, A cinnamoyl group, a maleate group, and an acrylamide group can be mentioned as preferred examples.
This polymerizable unsaturated group is a structural unit that undergoes addition polymerization with active radical species.

(Ii) Group represented by Formula (11) The specific organic compound preferably further includes a group represented by Formula (11) in the molecule. Specific examples of the group [—X—C (═Y) —NH—] represented by the formula (11) include [—O—C (═O) —NH—], [—O—C (═S). ) —NH—], [—S—C (═O) —NH—], [—NH—C (═O) —NH—], [—NH—C (═S) —NH—], and [ -S-C (= S) -NH-]. These groups can be used individually by 1 type or in combination of 2 or more types. Among them, from the viewpoint of thermal stability, [—O—C (═O) —NH—] group, [—O—C (═S) —NH—] group and [—S—C (═O) — It is preferable to use in combination with at least one of the NH— groups.
The group [—X—C (═Y) —NH—] represented by the formula (11) generates an appropriate cohesive force due to hydrogen bonding between molecules, and has excellent mechanical strength and group when cured. It is considered that it gives properties such as adhesion to the material and heat resistance.

(Iii) A silanol group or a group that generates a silanol group by hydrolysis The specific organic compound is a compound having a silanol group in the molecule (hereinafter sometimes referred to as “silanol group-containing compound”) or by hydrolysis. A compound that generates a silanol group (hereinafter sometimes referred to as a “silanol group-generating compound”) is preferable. Examples of such a silanol group-forming compound include compounds having an alkoxy group, aryloxy group, acetoxy group, amino group, halogen atom, etc. on the silicon atom, but an alkoxy group or aryloxy group on the silicon atom. In other words, an alkoxysilyl group-containing compound or an aryloxysilyl group-containing compound is preferable.
The silanol group-generating site of the silanol group or the silanol group-generating compound is a structural unit that binds to the oxide particles by a condensation reaction or a condensation reaction that occurs following hydrolysis.

(Iv) Preferred Embodiment Specific examples of the specific organic compound include compounds represented by the following formula (12).

R ¹⁹ and R ²⁰ may be the same or different, and are a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or an aryl group, and a represents a number of 1, 2 or 3.
Examples of R ¹⁹ and R ²⁰ include methyl, ethyl, propyl, butyl, octyl, phenyl, xylyl groups and the like.

Examples of the group represented by [(R ¹⁹ O) _a R ²⁰ _3-a Si—] include a trimethoxysilyl group, a triethoxysilyl group, a triphenoxysilyl group, a methyldimethoxysilyl group, a dimethylmethoxysilyl group, and the like. Can be mentioned. Of these groups, a trimethoxysilyl group or a triethoxysilyl group is preferable.

R ²¹ is a divalent organic group having an aliphatic or aromatic structure having 1 to 12 carbon atoms and may contain a chain, branched or cyclic structure. Examples of such an organic group include methylene, ethylene, propylene, butylene, hexamethylene, cyclohexylene, phenylene, xylylene, and dodecamethylene. Among these, preferred examples are methylene, propylene, cyclohexylene, phenylene and the like.

R ²² is a divalent organic group, and is usually selected from divalent organic groups having a molecular weight of 14 to 10,000, preferably a molecular weight of 76 to 500. For example, chain polyalkylene groups such as hexamethylene, octamethylene, dodecamethylene; alicyclic or polycyclic divalent organic groups such as cyclohexylene and norbornylene; divalent groups such as phenylene, naphthylene, biphenylene and polyphenylene Aromatic group; and these alkyl group-substituted and aryl group-substituted products. Further, these divalent organic groups may contain an atomic group containing an element other than carbon and hydrogen atoms, and include a polyether bond, a polyester bond, a polyamide bond, a polycarbonate bond, and a group represented by the formula (11). Can also be included.

R ²³ is a (b + 1) -valent organic group, preferably selected from a chain, branched or cyclic saturated hydrocarbon group and unsaturated hydrocarbon group.

  Z represents a monovalent organic group having a polymerizable unsaturated group in the molecule that undergoes an intermolecular crosslinking reaction in the presence of an active radical species. For example, acryloyl (oxy) group, methacryloyl (oxy) group, vinyl (oxy) group, propenyl (oxy) group, butadienyl (oxy) group, styryl (oxy) group, ethynyl (oxy) group, cinnamoyl (oxy) group , Maleate group, acrylamide group, methacrylamide group and the like. Among these, an acryloyl (oxy) group and a methacryloyl (oxy) group are preferable. Further, b is preferably a positive integer of 1 to 20, more preferably 1 to 10, and particularly preferably 1 to 5.

  For the synthesis of the specific organic compound used in the present invention, for example, a method described in JP-A-9-100111 can be used. That is, (i) it can be carried out by an addition reaction of a mercaptoalkoxysilane, a polyisocyanate compound, and an active hydrogen group-containing polymerizable unsaturated compound. (B) The reaction can be carried out by a direct reaction between a compound having an alkoxysilyl group and an isocyanate group in the molecule and an active hydrogen-containing polymerizable unsaturated compound. Furthermore, (c) it can also be directly synthesized by an addition reaction of a compound having a polymerizable unsaturated group and an isocyanate group in the molecule with mercaptoalkoxysilane or aminosilane.

In order to synthesize the compound represented by the formula (12), (a) is preferably used among these methods. More specifically, for example,
Method (a): First, a mercaptoalkoxysilane and a polyisocyanate compound are reacted to form an intermediate containing an alkoxysilyl group, [—S—C (═O) —NH—] group and an isocyanate group in the molecule. Next, an active hydrogen-containing polymerizable unsaturated compound is reacted with the isocyanate remaining in the intermediate, and this unsaturated compound is bonded via a [—O—C (═O) —NH—] group. How to
Method (b): First, a polyisocyanate compound and an active hydrogen-containing polymerizable unsaturated compound are reacted to form a polymerizable unsaturated group, [—O—C (═O) —NH—] group, and isocyanate in the molecule. Forming an intermediate containing a group, reacting this with a mercaptoalkoxysilane, and bonding the mercaptoalkoxysilane via a [—S—C (═O) —NH—] group,
Etc. Further, among them, the method (a) is preferable in that there is no decrease in polymerizable unsaturated groups due to the Michael addition reaction.

  In the synthesis of the compound represented by the formula (12), examples of the alkoxysilane capable of forming a [—S—C (═O) —NH—] group by reaction with an isocyanate group include an alkoxysilyl group. And compounds having at least one mercapto group in the molecule. Examples of such mercaptoalkoxysilane include mercaptopropyltrimethoxysilane, mercaptopropyltriethoxysilane, mercaptopropylmethyldiethoxysilane, mercaptopropyldimethoxymethylsilane, mercaptopropylmethoxydimethylsilane, mercaptopropyltriphenoxy silane, mercapto Mention may be made of propyltributoxysilane. Among these, mercaptopropyltrimethoxysilane and mercaptopropyltriethoxysilane are preferable. Moreover, an addition product of an amino-substituted alkoxysilane and an epoxy group-substituted mercaptan and an addition product of an epoxysilane and an α, ω-dimercapto compound can also be used.

  The polyisocyanate compound used when synthesizing the specific organic compound can be selected from polyisocyanate compounds composed of chain saturated hydrocarbons, cyclic saturated hydrocarbons, and aromatic hydrocarbons.

  Examples of such polyisocyanate compounds include, for example, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,3-xylylene diisocyanate, 1,4. -Xylylene diisocyanate, 1,5-naphthalene diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, 3,3'-dimethyl-4,4'-diphenylmethane diisocyanate, 4, 4'-diphenylmethane diisocyanate, 3,3'-dimethylphenylene diisocyanate, 4,4'-biphenylene diisocyanate, 1,6-hexane diisocyanate, isophorone diisocyanate, methylene bis (4-cyclohexyl) Isocyanato), 2,2,4-trimethylhexamethylene diisocyanate, bis (2-isocyanate) Til) fumarate, 6-isopropyl-1,3-phenyl diisocyanate, 4-diphenylpropane diisocyanate, lysine diisocyanate, hydrogenated diphenylmethane diisocyanate, 1,3-bis (Isocyanatemethyl) cyclohexane, tetramethylxylylene diisocyanate, 2,5 (or 6) -bis (isocyanatemethyl) -bicyclo [2.2.1] heptane, and the like. Among these, 2,4-tolylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, methylenebis (4-cyclohexylisocyanate), 1,3-bis (isocyanatemethyl) cyclohexane, and the like are preferable. These can be used singly or in combination of two or more.

  In the synthesis of a specific organic compound, as an example of an active hydrogen-containing polymerizable unsaturated compound that can be bonded to the polyisocyanate compound via an [—O—C (═O) —NH—] group by an addition reaction, Examples of compounds having at least one active hydrogen atom capable of forming a [—O—C (═O) —NH—] group by addition reaction with an isocyanate group and at least one polymerizable unsaturated group Can do.

Examples of these active hydrogen-containing polymerizable unsaturated compounds include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2- Hydroxy-3-phenyloxypropyl (meth) acrylate, 1,4-butanediol mono (meth) acrylate, 2-hydroxyalkyl (meth) acryloyl phosphate, 4-hydroxycyclohexyl (meth) acrylate 1,6-hexanediol mono (meth) acrylate, neopentyl glycol mono (meth) acrylate, trimethylolpropanedi (meth) acrylate, trimethylolethanedi (meth) acrylate, pentaerythris Litholtri (meth) acrylate, dipentaerythritol penta Data) acrylate - door, and the like can be given. Moreover, the compound obtained by addition reaction with glycidyl group containing compounds, such as alkyl glycidyl ether, allyl glycidyl ether, and glycidyl (meth) acrylate, and (meth) acrylic acid can be used. Among these compounds, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, pentaerythritol tri (meth) acrylate and the like are preferable.
These compounds can be used individually by 1 type or in mixture of 2 or more types.

(3) Surface treatment method of particles mainly composed of silica with a specific organic compound (hereinafter also referred to as particles) The surface treatment method of particles with a specific organic compound is not particularly limited. It is also possible to manufacture by mixing, heating and stirring. The reaction is preferably carried out in the presence of water in order to efficiently combine the silanol group-forming site of the specific organic compound with the particles. However, when the specific organic compound has a silanol group, there is no need for water. Therefore, the surface treatment can be performed by a method including an operation of mixing at least the particles and the specific organic compound.

  The reaction amount of the particles and the specific organic compound is preferably 0.01% by weight or more, more preferably 0.1% by weight or more, particularly preferably 1% by weight, with the total of the particles and the specific organic compound being 100% by weight. That's it. If it is less than 0.01% by weight, the dispersibility of the particles in the composition is not sufficient, and the transparency and scratch resistance of the resulting cured product may not be sufficient.

Hereinafter, the surface treatment method will be described in more detail using the alkoxysilyl group-containing compound (alkoxysilane compound) represented by the formula (12) as an example of the specific organic compound.
The amount of water consumed by hydrolysis of the alkoxysilane compound during the surface treatment may be an amount that allows at least one alkoxy group on silicon in one molecule to be hydrolyzed. Preferably, the amount of water added or present during hydrolysis is at least one third of the number of moles of all alkoxy groups on the silicon, more preferably one half of the number of moles of all alkoxy groups. It is less than 3 times. The product obtained by mixing the alkoxysilane compound and the particles in a completely moisture-free condition is a product in which the alkoxysilane compound is physically adsorbed on the particle surface, and particles composed of such components are not included. In the hardened | cured material of the composition to contain, the effect of expression of high hardness and abrasion resistance is low.

  At the time of surface treatment, after subjecting the alkoxysilane compound to a separate hydrolysis operation, this is mixed with powder particles or solvent dispersion sol of particles, followed by heating and stirring operations; hydrolysis of the alkoxysilane compound; Can be selected in the presence of particles; or a method in which particles are surface-treated in the presence of other components such as a polymerization initiator. In this, the method of hydrolyzing the said alkoxysilane compound in presence of particle | grains is preferable. During the surface treatment, the temperature is preferably 0 ° C. or higher and 150 ° C. or lower, more preferably 20 ° C. or higher and 100 ° C. or lower. The processing time is usually in the range of 5 minutes to 24 hours.

In the case of using a powdery powder during the surface treatment, an organic solvent may be added for the purpose of smoothly and uniformly carrying out the reaction with the alkoxysilane compound. Examples of such organic solvents include alcohols such as methanol, ethanol, isopropanol, butanol and octanol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone; ethyl acetate, butyl acetate, ethyl lactate and Y-butyrolactone. Esters such as ethylene glycol monomethyl ether and diethylene glycol monobutyl ether; aromatic hydrocarbons such as benzene, toluene and xylene; amides such as dimethylformamide, dimethylacetamide and N-methylpyrrolidone . Of these, methanol, isopropanol, butanol, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, butyl acetate, toluene and xylene are preferred.
The amount of these solvents added is not particularly limited as long as it meets the purpose of carrying out the reaction smoothly and uniformly.

  When a solvent-dispersed sol is used as the particles, it can be produced by mixing at least a solvent-dispersed sol and a specific organic compound. Here, an organic solvent which is uniformly compatible with water may be added for the purpose of ensuring the uniformity at the initial stage of the reaction and allowing the reaction to proceed smoothly.

In addition, an acid, a salt or a base may be added as a catalyst to promote the reaction during the surface treatment.
Examples of the acid include inorganic acids such as hydrochloric acid, nitric acid, sulfuric acid, and phosphoric acid; organic acids such as methanesulfonic acid, toluenesulfonic acid, phthalic acid, malonic acid, formic acid, acetic acid, and succinic acid; methacrylic acid, acrylic acid, and itacone An unsaturated organic acid such as an acid, as a salt, for example, an ammonium salt such as tetramethylammonium hydrochloride or tetrabutylammonium hydrochloride, and as a base, for example, aqueous ammonia, diethylamine, triethylamine, dibutylamine, Primary, secondary or tertiary aliphatic amines such as cyclohexylamine, aromatic amines such as pyridine, quaternary ammonium hydroxides such as sodium hydroxide, potassium hydroxide, tetramethylammonium hydroxide, tetrabutylammonium hydroxide Etc.
Among these, preferred examples of the acid include organic acids and unsaturated organic acids, and the base includes tertiary amine or quaternary ammonium hydroxide. The amount of these acids, salts or bases added is preferably 0.001 to 1.0 part by weight, more preferably 0.01 to 0.1 part by weight, based on 100 parts by weight of the alkoxysilane compound. It is.

In order to accelerate the reaction, it is also preferable to add a dehydrating agent.
As the dehydrating agent, inorganic compounds such as zeolite, anhydrous silica, and anhydrous alumina, and organic compounds such as methyl orthoformate, ethyl orthoformate, tetraethoxymethane, and tetrabutoxymethane can be used. Of these, organic compounds are preferable, and orthoesters such as methyl orthoformate and ethyl orthoformate are more preferable.
The amount of the alkoxysilane compound bonded to the particles is usually a thermogravimetric analysis from 110 ° C. to 800 ° C. in air as a constant value of weight loss% when the dry powder is completely burned in air. It can ask for.

  The compounding amount (total amount) of the component (C) in the composition of the present invention is usually 10 to 70% by weight, preferably 15 to 60% by weight, preferably 20 to 55% by weight based on the total amount of the composition other than the organic solvent. % Is more preferable.

［式中、Ｒ^２４、Ｒ^２５はそれぞれ独立に炭素数１〜４のアルキル基を表し、Ｒ^２６は水酸基又は炭素数１〜４のアルキル基を表し、Ｒ^２７は水素原子又はメチル基を表す。］
さらに、本発明の光重合開始剤は上記式（１３）が複数連なった構造であってもよく、その場合の分子量は３５０〜１０，０００の範囲が好ましい。
上記式（１３）の構造を有する光重合開始剤を用いることにより、汎用の重合開始剤を用いる場合と比べて、本発明の組成物を硬化させて得られる硬化膜の耐スチールウール性やエタノール耐性等の耐擦傷性が向上する。 (D) Photopolymerization initiator having a specific structure The composition of the present invention contains a photopolymerization initiator having a structure represented by the following formula (13) as a polymerization initiator.

[Wherein, R ²⁴ and R ²⁵ each independently represents an alkyl group having 1 to 4 carbon atoms, R ²⁶ represents a hydroxyl group or an alkyl group having 1 to 4 carbon atoms, and R ²⁷ represents a hydrogen atom or a methyl group. . ]
Furthermore, the photopolymerization initiator of the present invention may have a structure in which a plurality of the above formulas (13) are connected.
By using the photopolymerization initiator having the structure of the above formula (13), compared to the case of using a general-purpose polymerization initiator, the steel wool resistance and ethanol of the cured film obtained by curing the composition of the present invention. Abrasion resistance such as resistance is improved.

（式（１４）中、ｋは２〜５０の数を表す。） Specific examples of the photopolymerization initiator (D) used in the present invention include oligo (2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] propanone represented by the following formula (14): Can be mentioned.

(In formula (14), k represents a number of 2 to 50.)

  As a commercial item of (D) photoinitiator used by this invention, Esacure KIP150, 150P (above, Lamberti company make) is mentioned, for example.

  The compounding amount of the component (D) in the composition of the present invention is usually 0.5 to 15% by weight based on the total amount of the composition other than the organic solvent, preferably 1 to 10% by weight, and preferably 3 to 10% by weight. Is more preferable. If the blending amount of the component (D) is less than 0.5% by weight, the curability may be insufficient and good scratch resistance may not be exhibited. If it exceeds 15% by weight, the initiator functions as a plasticizer and has good resistance to resistance. There is a possibility that the scratching property may not be exhibited.

(E) Organic solvent It is preferable to add an organic solvent to the composition of the present invention. Thus, by adding an organic solvent, a thin antireflection film can be formed uniformly. Examples of such an organic solvent include one kind or a combination of two or more kinds such as methyl isobutyl ketone, methyl ethyl ketone, methanol, ethanol, t-butanol, and isopropanol.

  The addition amount of the organic solvent is not particularly limited, but is preferably 100 to 100,000 parts by weight with respect to 100 parts by weight of the ethylenically unsaturated group-containing fluoropolymer. This is because when the amount added is less than 100 parts by weight, it may be difficult to adjust the viscosity of the composition of the present invention. On the other hand, when the amount added exceeds 100,000 parts by weight, This is because the storage stability may be lowered, or the viscosity may be too low to make handling difficult.

(F) Additive In the composition of the present invention, a polymerization initiator other than the component (D), a photosensitizer, a polymerization inhibitor, a polymerization initiation assistant, and a leveling are within the range not impairing the object and effect of the present invention. Additives such as additives, wettability improvers, surfactants, plasticizers, UV absorbers, antioxidants, antistatic agents, silane coupling agents, inorganic fillers other than the component (C), pigments, dyes, etc. It is also preferable to contain.

  As the polymerization initiator other than the component (D), the following compounds that generate active species by irradiation with active energy rays or heat can be used.

(1) Compounds that generate active species upon irradiation with active energy rays Compounds that generate active species upon irradiation with active energy rays (hereinafter referred to as “photopolymerization initiators”) include light that generates radicals as active species. A radical generator etc. are mentioned.
The active energy ray is defined as an energy ray capable of decomposing a compound that generates active species to generate active species. Examples of such active energy rays include optical energy rays such as visible light, ultraviolet rays, infrared rays, X-rays, α rays, β rays, and γ rays. However, it is preferable to use ultraviolet rays from the viewpoint of having a certain energy level, a high curing speed, and a relatively inexpensive irradiation apparatus, and a small size.

(I) Kind Examples of the photo radical generator include acetophenone, acetophenone benzyl ketal, anthraquinone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, carbazole, xanthone, 4- Chlorobenzophenone, 4,4′-diaminobenzophenone, 1,1-dimethoxydeoxybenzoin, 3,3′-dimethyl-4-methoxybenzophenone, thioxanthone, 2,2-dimethoxy-2-phenylacetophenone, 1- (4-dodecyl) Phenyl) -2-hydroxy-2-methylpropan-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one, triphenylamine, 2,4,6- Trimethylbenzoyldiphenylphosphine oxide, -Hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, fluorenone, fluorene, benzaldehyde, benzoin ethyl ether, benzoin propyl ether, benzophenone, Michler ketone, 3-methylacetophenone, 3,3 ' , 4,4′-tetra (tert-butylperoxycarbonyl) benzophenone (BTTB), 2- (dimethylamino) -1- [4- (morpholinyl) phenyl] -2-phenylmethyl) -1-butanone, 4- Examples include benzoyl-4′-methyldiphenyl sulfide, benzyl, or a combination of BTTB and xanthene, thioxanthene, coumarin, ketocoumarin, and other dye sensitizers.

  Among these photopolymerization initiators, 2,2-dimethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2,4,6- Trimethylbenzoyldiphenylphosphine oxide, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one, 2- (dimethylamino) -1- [4- (morpholinyl) phenyl] -2- Phenylmethyl) -1-butanone and the like are preferable, and 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one, 2- (dimethyl Amino) -1- [4- (morpholinyl) phenyl] -2-phenylmethyl) 1-butanone, and the like can be given.

(2) Compound that generates active species by heat Examples of the compound that generates active species by heat (hereinafter referred to as “thermal polymerization initiator”) include a thermal radical generator that generates radicals as the active species.

(I) Type Examples of thermal radical generators include benzoyl peroxide, tert-butyl-oxybenzoate, azobisisobutyronitrile, acetyl peroxide, lauryl peroxide, tert-butyl peracetate, cumyl peroxide, tert -One kind of butyl peroxide, tert-butyl hydroperoxide, 2,2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (4-methoxy-2,4-dimethylvaleronitrile), etc. Single or 2 or more types of combinations can be mentioned.

Next, a method for preparing the composition of the present invention and curing conditions will be described.
The composition of the present invention comprises (A) an ethylenically unsaturated group-containing fluorine-containing polymer, (B) component, (C) component and (D) component, or, if necessary, (E) component, ( F) An organic solvent and (G) an additive can be added and mixed at room temperature or under heating conditions. Specifically, it can be prepared using a mixer such as a mixer, a kneader, a ball mill, or a three roll. However, when mixing under heating conditions, it is preferable to carry out at or below the decomposition start temperature of the thermal polymerization initiator.

The curing conditions of the composition of the present invention are not particularly limited. For example, when an active energy ray is used, it is preferable to set the exposure amount within a range of 0.01 to 10 J / cm ² .
This is because when the exposure dose is less than 0.01 J / cm ² , curing failure may occur. On the other hand, when the exposure dose exceeds 10 J / cm ² , the curing time may become excessively long. Because there is.
For these reasons, the exposure dose is more preferably set to a value in the range of 0.1 to 5 J / cm ² , and more preferably set to a value in the range of 0.3 to 3 J / cm ^2. .

Moreover, when making the composition of this invention heat and harden | cure, it is preferable to heat for 1 to 180 minutes at the temperature within the range of 30-200 degreeC. By heating in this way, an antireflection film having excellent scratch resistance can be obtained more efficiently without damaging the substrate and the like.
For these reasons, it is more preferable to heat at a temperature in the range of 50 to 180 ° C. for 2 to 120 minutes, and further to heat at a temperature in the range of 80 to 150 ° C. for 5 to 60 minutes. preferable.

2. Antireflective film The antireflective film of this invention contains the low-refractive-index layer which consists of hardened | cured material which hardened the composition of the said invention. Furthermore, the antireflection film of the present invention can contain a high refractive index layer, a hard coat layer, and / or a substrate under the low refractive index layer.
FIG. 1 shows such an antireflection film 10. As shown in FIG. 1, a hard coat layer 14, a high refractive index layer 16, and a low refractive index layer 18 are laminated on a substrate 12.
At this time, the high refractive index layer 16 may be formed directly on the substrate 12 without providing the hard coat layer 14.
Further, an intermediate refractive index layer (not shown) may be further provided between the high refractive index layer 16 and the low refractive index layer 18 or between the high refractive index layer 16 and the hard coat layer 14.

(1) Low refractive index layer A low refractive index layer is comprised from the hardened | cured material obtained by hardening | curing the composition of this invention. Since the composition and the like of the composition of the present invention are as described above, a specific description thereof will be omitted, and the refractive index and thickness of the low refractive index layer will be described below.

The refractive index of the cured product obtained by curing the composition of the present invention (the refractive index of Na-D line, measurement temperature 25 ° C.), that is, the refractive index of the low refractive index film is preferably 1.45 or less. . The reason for this is that when the refractive index of the low refractive index film exceeds 1.45, the antireflection effect may be significantly reduced when combined with a high refractive index film.
Therefore, the refractive index of the low refractive index film is more preferably 1.44 or less, and further preferably 1.43 or less.
In the case where a plurality of low refractive index films are provided, at least one of the low refractive index films only needs to have a refractive index value within the above-described range. Therefore, the other low refractive index films exceed 1.45. It may be a value.

Moreover, when providing a low refractive index layer, since the more excellent antireflection effect is acquired, it is preferable to make the refractive index difference between high refractive index layers into 0.05 or more values. The reason for this is that when the refractive index difference between the low refractive index layer and the high refractive index layer is less than 0.05, a synergistic effect in these antireflective film layers cannot be obtained. This is because there is a case in which the lowering may occur.
Therefore, it is more preferable to set the refractive index difference between the low refractive index layer and the high refractive index layer to a value within the range of 0.1 to 0.5, and within the range of 0.15 to 0.5. More preferably, it is a value.

The thickness of the low refractive index layer is not particularly limited, but is preferably 50 to 300 nm, for example. The reason for this is that when the thickness of the low refractive index layer is less than 50 nm, the adhesion to the high refractive index film as the base may be reduced. On the other hand, when the thickness exceeds 300 nm, optical interference occurs. This is because the antireflection effect may be reduced.
Therefore, the thickness of the low refractive index layer is more preferably 50 to 250 nm, and further preferably 60 to 200 nm.
In order to obtain higher antireflection properties, when a plurality of low refractive index layers are provided to form a multilayer structure, the total thickness may be set to 50 to 300 nm.

(2) High refractive index layer Although it does not restrict | limit especially as a curable composition for forming a high refractive index layer, As a film formation component, epoxy-type resin, phenol-type resin, melamine-type resin, It is preferable to include one kind or a combination of two or more kinds of alkyd resins, cyanate resins, acrylic resins, polyester resins, urethane resins, siloxane resins and the like. If these resins are used, a strong thin film can be formed as the high refractive index layer, and as a result, the scratch resistance of the antireflection film can be remarkably improved.
However, the refractive index of these resins alone is usually 1.45 to 1.62, which may not be sufficient to obtain high antireflection performance. Therefore, it is more preferable to blend high refractive index inorganic particles, for example, metal oxide particles. Moreover, as a hardening form, although the curable composition which can be thermosetting, ultraviolet curing, and electron beam curing can be used, the ultraviolet curable composition with favorable productivity is used more suitably.

The thickness of the high refractive index layer is not particularly limited, but is preferably 50 to 30,000 nm, for example. The reason for this is that when the thickness of the high refractive index layer is less than 50 nm, the antireflection effect and adhesion to the substrate may be reduced when combined with the low refractive index layer, while the thickness is If the thickness exceeds 30,000 nm, optical interference may occur, and the antireflection effect may be reduced.
Therefore, the thickness of the high refractive index layer is more preferably 50 to 1,000 nm, and further preferably 60 to 500 nm.
Further, in order to obtain higher antireflection properties, when a plurality of high refractive index layers are provided to form a multilayer structure, the total thickness may be set to 50 to 30,000 nm.
In addition, when providing a hard-coat layer between a high refractive index layer and a base material, the thickness of a high refractive index layer can be 50-300 nm.

(3) Hard coat layer The constituent material of the hard coat layer used in the antireflection film of the present invention is not particularly limited. Examples of such a material include one kind of siloxane resin, acrylic resin, melamine resin, epoxy resin, or a combination of two or more kinds.

  Moreover, although it does not restrict | limit especially also about the thickness of a hard-coat layer, it is preferable to set it as 1-50 micrometers, and it is more preferable to set it as 5-10 micrometers. The reason for this is that when the thickness of the hard coat layer is less than 1 μm, the adhesion of the antireflection film to the substrate may not be improved. On the other hand, when the thickness exceeds 50 μm, it is uniform. This is because it may be difficult to form.

(4) Substrate The type of the substrate used for the antireflection film of the present invention is not particularly limited. For example, glass, polycarbonate resin, polyester resin, acrylic resin, triacetyl cellulose resin (TAC) The base material which consists of etc. can be mentioned. By using an antireflection film containing these base materials, excellent reflection can be achieved in a wide range of application areas of antireflection films such as camera lens parts, television (CRT) screen display parts, and color filters in liquid crystal display devices. The prevention effect can be obtained.

  EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated further in detail, the scope of the present invention is not limited to description of these Examples at all. In the examples, unless otherwise specified, the amount of each component means “parts” by weight and “%” means weight percent.

Production Example 1: Production of acryloyl group-containing fluoropolymer (A-1) A stainless steel autoclave with an internal volume of 3 L with a magnetic stirrer was sufficiently substituted with nitrogen gas, and then 1154 g of ethyl acetate, 346.4 g of perfluoro (propyl vinyl ether), 93.8 g of ethyl vinyl ether, 114.6 g of hydroxyethyl vinyl ether, 458.1 g of “ADEKA rear soap ER-30” (manufactured by Asahi Denka Kogyo Co., Ltd., solid content concentration 15%) as a nonionic reactive emulsifier, polydimethyl azo group 22.5 g of “VPS-1001” (manufactured by Wako Pure Chemical Industries, Ltd.) and 3.8 g of lauroyl peroxide were added as siloxanes, cooled to −50 ° C. with dry ice-methanol, and then oxygen in the system again with nitrogen gas. Was removed.

Next, 214.8 g of hexafluoropropylene was added, and the temperature increase was started. The pressure when the temperature in the autoclave reached 60 ° C. was 5.3 × 10 ⁵ Pa. Thereafter, the reaction was continued with stirring at 70 ° C. for 20 hours. When the pressure dropped to 1.7 × 10 ⁵ Pa, the autoclave was cooled with water to stop the reaction. After reaching room temperature, the unreacted monomer was released and the autoclave was opened to obtain a polymer solution with a solid content of 29%. The obtained polymer solution was poured into methanol to precipitate a polymer, washed with methanol, and vacuum dried at 50 ° C. to obtain 780 g of a fluoropolymer.

  Furthermore, in a 1 liter separable flask equipped with a magnetic stirrer, a glass cooling tube and a thermometer, 50.0 g of the above-mentioned fluoropolymer and 2,6-di-t-butylmethylphenol as a polymerization inhibitor were used. 0.01 g and 374 g of methyl isobutyl ketone (hereinafter referred to as “MIBK”) were charged, and the mixture was stirred at 20 ° C. until the fluoropolymer was dissolved in MIBK and the solution became transparent and uniform. Next, 16.0 g of 2-acryloyloxyethyl isocyanate was added to this system and stirred until the solution became homogeneous, then 0.1 g of dibutyltin dilaurate was added to start the reaction, and the temperature of the system was changed to 55 to 55. The MIBK solution of the acryloyl group-containing fluoropolymer (A-1) was obtained by maintaining at 65 ° C. and continuing stirring for 5 hours. 2 g of this solution was weighed in an aluminum dish, dried on a hot plate at 150 ° C. for 5 minutes, and weighed to determine the solid content, which was 15.0%.

Production Example 2: Production of acryloyl group-containing fluoropolymer (A-2) A stainless steel autoclave with an internal volume of 3 L with a magnetic stirrer was sufficiently replaced with nitrogen gas, and then 1050 g of ethyl acetate, 563.6 g of perfluoro (propyl vinyl ether), Add 186.4 g of hydroxyethyl vinyl ether, 22.5 g of “VPS-1001” (manufactured by Wako Pure Chemical Industries, Ltd.) and 3.8 g of lauroyl peroxide as azo group-containing polydimethylsiloxane, and dry ice-methanol up to −50 ° C. After cooling, oxygen in the system was removed again with nitrogen gas.

Next, the temperature increase was started, and the pressure when the temperature in the autoclave reached 60 ° C. was 5.3 × 10 ⁵ Pa. Thereafter, the reaction was continued with stirring at 70 ° C. for 20 hours. When the pressure dropped to 1.7 × 10 ⁵ Pa, the autoclave was cooled with water to stop the reaction. After reaching room temperature, the unreacted monomer was released and the autoclave was opened to obtain a polymer solution with a solid content of 29%. The obtained polymer solution was poured into methanol to precipitate a polymer, washed with methanol, and vacuum dried at 50 ° C. to obtain 780 g of a fluoropolymer.

  Furthermore, in a 1 liter separable flask equipped with a magnetic stirrer, a glass cooling tube and a thermometer, 50.0 g of the above-mentioned fluoropolymer and 2,6-di-t-butylmethylphenol as a polymerization inhibitor were used. 0.01 g and 407 g of methyl isobutyl ketone (hereinafter referred to as “MIBK”) were charged, and the mixture was stirred at 20 ° C. until the fluoropolymer was dissolved in MIBK and the solution became transparent and uniform. Next, 21.8 g of 2-acryloyloxyethyl isocyanate was added to this system and stirred until the solution became homogeneous, then 0.1 g of dibutyltin dilaurate was added to start the reaction, and the temperature of the system was changed to 55 to 55. The MIBK solution of the acryloyl group-containing fluoropolymer (A-1) was obtained by maintaining at 65 ° C. and continuing stirring for 5 hours. 2 g of this solution was weighed in an aluminum dish, dried on a hot plate at 150 ° C. for 5 minutes, and weighed to determine the solid content, which was 15.0%.

Production Example 3: Production of particles (P-1) containing silica as a main component A mixture of 100 g of silica sol having an average particle diameter of 5 nm and a SiO ₂ concentration of 20% by weight and 1900 g of pure water was heated to 80 ° C. The pH of this reaction mother liquor was 10.5, and 9000 g of a 1.17 wt% sodium silicate aqueous solution as SiO ₂ and 9000 g of a 0.83 wt% sodium aluminate aqueous solution as Al ₂ O ₃ were simultaneously added to the mother liquor. . Meanwhile, the temperature of the reaction solution was kept at 80 ° C. The pH of the reaction solution rose to 12.5 immediately after the addition, and hardly changed thereafter. After completion of the addition, the reaction solution was cooled to room temperature and washed with an ultrafiltration membrane to prepare a SiO ₂ .Al ₂ O ₃ core particle dispersion having a solid content concentration of 20% by weight.

1,700 g of pure water was added to 500 g of this core particle dispersion and heated to 98 ° C., and while maintaining this temperature, a silicic acid solution (SiO 2 concentration) obtained by dealkalizing a sodium silicate aqueous solution with a cation exchange resin. 3.5 wt%) 3,000 g was added to obtain a dispersion of core particles having a silica shell.
Next, 1,125 g of pure water was added to 500 g of a dispersion of core particles formed with a silica shell having a solid content concentration of 13 wt% by washing with an ultrafiltration membrane, and concentrated hydrochloric acid (35.5%) was further added. The solution was dropped to pH 1.0, and dealumination was performed. Subsequently, the aluminum salt dissolved in the ultrafiltration membrane was separated while adding 10 liters of pH 3 hydrochloric acid aqueous solution and 5 liters of pure water, and then the solvent was replaced with ethanol using the ultrafiltration membrane, so that the solid content concentration was 20 wt. A dispersion S-1 of hollow silica-based particles composed of% silica outer shell was prepared.
The average particle diameter and refractive index of the silica-based particles were 50 nm and 1.29, respectively. Here, the average particle diameter was measured with a transmission electron microscope.

Production Example 4: Synthesis of specific organic compound (S-1) having a polymerizable group In dry air, 60 parts of isophorone diisocyanate is stirred with respect to a solution consisting of 23 parts of mercaptopropyltrimethoxysilane and 0.5 parts of dibutyltin dilaurate. While dropping at 50 ° C. over 1 hour, the mixture was heated and stirred at 70 ° C. for 3 hours. NK ester A-TMM-3LM-N (60% by weight of pentaerythritol triacrylate and 40% by weight of pentaerythritol tetraacrylate) manufactured by Shin-Nakamura Chemical Co., Ltd. After adding 202 parts dropwise at 30 ° C. over 1 hour and then stirring with heating at 60 ° C. for 10 hours, an organic compound containing a polymerizable group was obtained. When the residual isocyanate content in the reaction solution was analyzed by FT-IR, it was 0.1% or less, indicating that the reaction was almost quantitatively completed. In the infrared absorption spectrum of the product, the 2550 Kaiser absorption peak characteristic of the mercapto group in the raw material and the 2260 Kaiser absorption peak characteristic of the raw material isocyanate compound disappeared, and a new urethane bond and S (C = O) A peak of 1660 Kaiser characteristic of NH-group and a peak of 1720 Kaiser characteristic of acryloxy group were observed, and both an acryloxy group as a polymerizable unsaturated group, -S (C = O) NH-, and a urethane bond were observed. It was shown that an acryloxy group-modified alkoxysilane was produced. As a result, a mixture (S-1) containing the compounds represented by the following formulas (20) and (21) (including pentaerythritol tetraacrylate not involved in the reaction) was obtained.

［式中、Ａｃｒｙｌは、アクリロイル基を示し、Ｍｅ、メチル基を示す。］

[Wherein, Acryl represents an acryloyl group, Me, and a methyl group. ]

Production Example 5: Production of acrylic-modified silica particles (C-1) 2.5 parts of composition (S-1) containing the specific organic compound synthesized in Production Example 4 and silica-based particles synthesized in Production Example 3 (P- 1, 97.1 parts (number average particle diameter 0.05 μm) (solid content 20.4 parts), 0.2 part of isopropanol, 0.1 part of ion-exchanged water, and 0.01 part of 0.1N nitric acid After stirring at 80 ° C. for 3 hours, 0.4 part of methyl orthoformate was added, and further heated and stirred at the same temperature for 1 hour to obtain a colorless transparent particle dispersion (C-1). When 2 g of the particle dispersion (C-1) was weighed on an aluminum dish, dried on a hot plate at 120 ° C. for 1 hour and weighed to determine the solid content, it was 23% by weight.
Production Example 6: Production of acrylic-modified silica particles (C-2) 8.7 parts of composition (S-1) containing the specific organic compound synthesized in Production Example 4, methyl ethyl ketone silica sol (MEK-ST-L, Nissan Chemical Industries) A mixture of 91.3 parts (solid content 27.4 parts), 0.2 parts of isopropanol and 0.1 part of ion-exchanged water at 80 ° C. After stirring for a period of time, 1.4 parts of methyl orthoformate was added, and the mixture was further heated and stirred at the same temperature for 1 hour to obtain a colorless transparent particle dispersion (C-2). When 2 g of the particle dispersion (C-2) was weighed on an aluminum dish, dried on a hot plate at 120 ° C. for 1 hour and weighed to determine the solid content, it was 35% by weight.

Production Example 7: Production of acrylic modified silica particles (C-3) 8.7 parts of composition (S-1) containing the specific organic compound synthesized in Production Example 4, methyl ethyl ketone silica sol (MEK-ST, manufactured by Nissan Chemical Industries, Ltd., Number average particle diameter 0.02 μm, silica concentration 30%) 91.3 parts (solid content 27.4 parts), isopropanol 0.2 part and ion-exchanged water 0.1 part were mixed at 80 ° C. for 3 hours. Thereafter, 1.4 parts of orthoformate methyl ester was added, and the mixture was further heated and stirred at the same temperature for 1 hour to obtain a colorless transparent particle dispersion (C-3). When 2 g of the particle dispersion (C-3) was weighed on an aluminum dish, dried on a hot plate at 120 ° C. for 1 hour and weighed to determine the solid content, it was 35% by weight.

Example 1 Preparation of Curable Resin Composition 1 In a container shielded from ultraviolet rays, 60.4 g of the acryloyl group-containing fluoropolymer (A-1) obtained in Production Example 1 and dipentaerythritol hydroxypentaacrylate (SR399E). 6.7 g of Sartomer), 28.3 g of the acrylic modified silica particles (C-2) obtained in Production Example 5, 4.6 g of KIP150 (manufactured by Sartomer) and 115 g of MIBK were added and stirred. The solid content concentration of the obtained curable resin composition was 8%.

Example 2, Reference Example 1, Comparative Examples 1-3
A curable resin composition was obtained in the same manner as in Example 1 except that each component was blended in the ratio shown in Table 1.

Moreover, the cured film was produced using the curable resin composition manufactured in the said Example 1, 2, the reference example 1, and Comparative Examples 1-3, and the characteristic of the cured film was evaluated. The manufacturing method of a cured film is as follows.
In a container shielded from ultraviolet rays, 98.6 g of C-3 synthesized in Production Example 7, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one (IRGACURE907, Ciba. 1.2 g of Specialty Chemicals), 33.2 g of polyfunctional urethane acrylate oligomer (U-6HA, Shin-Nakamura Chemical Co., Ltd.) and 7 g of cyclohexanone were mixed and stirred to obtain a composition for silica particle-containing hard coat layer. This silica particle-containing composition for hard coat layer was coated on a polyethylene terephthalate film (Toyobo A4300, film thickness 188 μm) using a wire bar coater (# 12), and then dried in an oven at 80 ° C. for 1 minute. . Subsequently, a hard coat layer was formed by irradiating ultraviolet rays under light irradiation conditions of 0.3 J / cm ² using a high-pressure mercury lamp in the air. It was 5 micrometers when the film thickness of the hard-coat layer was measured with the stylus type film thickness meter.

Each curable resin composition obtained in Examples 1 and 2, Reference Example 1 and Comparative Examples 1 to 3 is applied onto the obtained hard coat layer using a wire bar coater (# 3). And dried at 80 ° C. for 5 minutes. Thereafter, a cured film layer having a thickness of 0.1 μm was formed by irradiating ultraviolet rays under a light irradiation condition of 0.9 J / cm ² using a high-pressure mercury lamp lamp in a nitrogen atmosphere.

<Evaluation of cured film>
The obtained cured film was evaluated for the following characteristics. The obtained results are shown in Table 1.
(1) Appearance The cured film obtained by the above method was visually observed under a fluorescent lamp, and defects on appearance such as irregularities due to foreign matters and rainbow patterns due to coating unevenness were evaluated according to the following criteria.
○: No unevenness or coating unevenness is observed in the cured film, or a slight amount is observed.
Δ: Unevenness or coating unevenness is observed in the cured film.
X: Many irregularities and coating unevenness are recognized in the cured film.

(2) Haze The turbidity (Haze value) in the obtained laminate was measured using a Haze meter and evaluated according to the following criteria.
○: Haze value is 1% or less.
Δ: Haze value is 3% or less.
X: Haze value exceeds 3%.

(3) Reflectance The antireflection property of the obtained antireflection laminate was measured using a spectral reflectance measuring device (a self-recording spectrophotometer U-3410 incorporating a large sample chamber integrating sphere attachment device 150-09090, Hitachi, Ltd. )), The reflectance was measured and evaluated in the wavelength range of 340 to 700 nm. Specifically, the reflectance of the antireflection laminate (antireflection film) at each wavelength is measured using the reflectance of the aluminum deposited film as a reference (100%), and from the reflectance of light at a wavelength of 550 nm, The antireflection property was evaluated according to the following criteria.
A: The reflectance is 2% or less.
Δ: Reflectance is 3% or less.
X: Reflectance exceeds 3%.

(4) Steel wool resistance The steel wool resistance test of the cured film was carried out by the following method. That is, steel wool (Bonster No. 0000, manufactured by Nippon Steel Wool Co., Ltd.) was attached to a Gakushin type friction fastness tester (AB-301, manufactured by Tester Sangyo Co., Ltd.), and the surface of the cured film was loaded with a load of 500 g. The film was repeatedly rubbed 10 times under the above conditions, and the presence or absence of scratches on the surface of the cured film was visually evaluated according to the following criteria.
○: No peeling or scratching of the cured film is observed or hardly observed.
(Triangle | delta): A thin crack is recognized by the cured film.
X: Peeling occurred in a part of the cured film, or streak scratches occurred on the surface of the cured film.

(5) Ethanol resistance The ethanol resistance test of the cured film was performed by the following method. That is, a cheesecloth soaked with ethanol was attached to a Sony standard eraser tester (manufactured by Honko Seisakusho), and the surface of the cured film was repeatedly rubbed 50 times under a load of 1.5 kg. The presence or absence of occurrence was visually evaluated according to the following criteria.
○: No peeling or scratching of the cured film is observed or hardly observed.
(Triangle | delta): A thin crack is recognized by the cured film.
X: Peeling occurred in a part of the cured film, or streak scratches occurred on the surface of the cured film.

(7) Antifouling property The antifouling property test of the cured film was carried out by the following method. A fingerprint was adhered on the obtained antireflection film, and the fingerprint was wiped with Bencot (S-2, manufactured by Asahi Kasei Co., Ltd.). The wiping trace was visually evaluated according to the following criteria.
○: Fingerprints can be completely wiped off.
Δ: A slight fingerprint remains.
X: Fingerprints cannot be wiped off at all.

Details of the components described in Table 1 are shown below.
(A) component:
Acryloyl group-containing fluoropolymer A-1 (produced in Production Example 1)
Acryloyl group-containing fluoropolymer A-2 (produced in Production Example 2)
(B) component:
Dipentaerythritol hydroxypentaacrylate (SR399, manufactured by Sartomer)
(C) component:
Acrylic-modified silica particles C-1 (produced in Production Examples 3 to 5)
Acrylic modified silica particles C-2 (produced in Production Example 6)
Acrylic modified silica particles C-3 (produced in Production Example 7)
(D) component:
ESACURE KIP150: Oligo [2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] propanone] (manufactured by Sartomer)
(E) component:
MEK: methyl ethyl ketone MIBK: methyl isobutyl ketone PGMEA: propylene glycol monomethyl ether acetate EtOH: ethanol (F) component:
Both-end methacryl-modified polydimethylsiloxane (FM7725 manufactured by Chisso Corporation, both-end methacrylacrylic polydimethylsiloxane, slip agent)
Other ingredients:
Irgacure 907: 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one (manufactured by Ciba Specialty Chemicals)
Irgacure 184: 1-hydroxycyclohexyl phenyl ketone (Ciba Specialty Chemicals)

  The curable resin composition of the present invention is excellent in scratch resistance, coating property and durability, and is particularly useful as an antireflection film.

It is sectional drawing of the antireflection film by one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Antireflection film 12 Base material 16 Hard-coat layer 18 Low refractive index layer

Claims (6)

A curable resin composition containing the following components (A), (B), (C) and (D).
(A) a compound containing one isocyanate group and at least one ethylenically unsaturated group;
The following structural units (a), (b) and (c) are included, and the total weight of the structural units (a), (b) and (c) is 80% by weight of the hydroxyl group-containing fluoropolymer. A hydroxyl group-containing fluoropolymer occupying the above,
Ethylenically unsaturated group-containing fluorine-containing polymer obtained by reacting at a molar ratio of isocyanate group / hydroxyl group of 0.2 to 1.5
(A) Structural unit represented by the following formula (1)
(B) Structural unit represented by the following formula (2)
(C) Structural unit represented by the following formula (3)

[In the formula (1), R ¹ represents a fluorine atom, a fluoroalkyl group or a group represented by —OR ² (R ² represents an alkyl group or a fluoroalkyl group). (The hydroxyl group-containing fluoropolymer includes the structural unit (a) in which R ¹ is —OR ² as an essential structural unit.)

[In the formula (2), R ³ represents a hydrogen atom or a methyl group, R ⁴ represents an alkyl group, a group represented by —O (CH ₂ ) _x R ⁵ , or —OCOR ⁵ (R ⁵ represents an alkyl group, fluoro An alkyl group or a glycidyl group, x represents a number of 0 to 2), a carboxyl group or an alkoxycarbonyl group]

[In formula (3), R ⁶ represents a hydrogen atom or a methyl group, R ⁷ represents a hydrogen atom or a hydroxyalkyl group, and v represents a number of 0 to 2.]
(B) (Meth) acrylate compound (C) Particles mainly composed of silica having a number average particle diameter of 1 to 100 nm (D) Photopolymerization initiator having a structure represented by the following formula (13)

[In Formula (13), R ²⁴ and R ²⁵ each independently represents an alkyl group having 1 to 4 carbon atoms, R ²⁶ represents a hydroxyl group or an alkyl group having 1 to 4 carbon atoms, and R ²⁷ represents a hydrogen atom or methyl. Represents a group. ]   The curable resin composition according to claim 1, wherein the (B) (meth) acrylate compound contains a compound containing at least two (meth) acryloyl groups in the molecule.   The curable resin composition according to claim 1 or 2, wherein the particles (C) having silica as a main component are surface-treated with an organic compound containing a polymerizable unsaturated group.   The curable resin composition according to any one of claims 1 to 3, which is used for an antireflection film.   The cured film obtained by hardening the curable resin composition as described in any one of Claims 1-4.   An antireflection film having a low refractive index layer made of the cured product according to claim 5.

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