JP5663618B2 - Polymerizable composition, antireflection film, polarizing plate and image display device using the same - Google Patents

Description

  The present invention relates to a polymerizable composition, an antireflection film using the polymerizable composition, a polarizing plate using the antireflection film, and an image display device using the antireflection film or the polarizing plate on the outermost surface of a display.

In general, an antireflection film is used in an image display device such as a cathode ray tube display (CRT), plasma display (PDP), electroluminescence display (ELD), liquid crystal display (LCD), etc. In order to prevent reflection of light, it is arranged on the outermost surface of the display so as to reduce the reflectance by using the principle of optical interference. Therefore, in addition to high antireflection performance, the antireflection film has high antifouling properties against oil and fat components such as fingerprints and sebum, and high physical strength (such as scratch resistance), high transmittance, chemical resistance, and weather resistance ( Resistance to moisture and heat).
As such an antireflection film, a film having a single optical interference layer is known. However, from the viewpoint of achieving further low reflection, a multilayer type antireflection film having a plurality of optical interference layers such as a low refractive index layer, a middle refractive index layer, and a high refractive index layer has been developed. It is.
Such a multilayer antireflection film can achieve low reflection, but the reflection color may change when the thickness or refractive index of each layer varies. In particular, when fingerprints or sebum adheres to the surface of the coating film, even if wiped off, only a small amount of oil and fat components remain, resulting in a change in refractive index. It is conspicuous that it is visually recognized, and the visibility of the video tends to be lowered. Therefore, the multilayer antireflection film is particularly required to have high antifouling properties against oil and fat components such as fingerprints and sebum.

As a technique for imparting antifouling properties, a method of reducing the surface free energy on the coating film surface using a silicone compound having a polydimethylsiloxane structure or a fluorine-based compound is generally known. For example, it has been proposed to impart antifouling performance using a compound having a long perfluoropolyether chain (PFPE) and a polyfunctional polymerizable unsaturated group (see, for example, Patent Documents 1 and 2). ).
However, since these compounds use PFPE (Fluorolink D) manufactured by Solvay Solexis as a raw material, the repeating structure represented by-(CF ₂ CF ₂ O) _m- and-(CF ₂ O ) A compound having two types of repeating structures with a repeating structure represented by _n- . Fluorolink D _is represented by _{HOCH 2 CF 2 O (CF 2} CF 2 O) m (CF 2 O) n CF 2 CH 2 OH.
In the structure of Compound 1 described in paragraph 0020 of Patent Document 1, the repeating structure is −
Although it is represented by (CF ₂ CF ₂ O) _n −, this is an error. Actually, the repeating structure in Compound 1 of Patent Document 1 is represented by — (CF ₂ CF ₂ O) _m —. It is known that it consists of two types of repeating structures, that is, a repeating structure represented by (CF ₂ O) _n- .
Considering improvement in surface tension lowering ability by increasing hydrophobic interaction between PFPE structures, a PFPE structure having a single structure such as a — (CF ₂ CF ₂ O) _m — structure has been desired. As shown, it was difficult to obtain a repetitive structure consisting of only a single — (CF ₂ CF ₂ O) _m — structure from the production process of Fluorolink D (for example, see Non-Patent Document 1).

  Further, in order to impart antifouling properties to the low refractive index layer, further improvements in low refractive index properties, antifouling properties and scratch resistance are required.

JP 2009-256597 A Japanese Patent No. 4556151

Introduction to Fluorine Chemistry 2010

  An object of the present invention is to provide a polymerizable composition having a low refractive index and an excellent antifouling property and scratch resistance, an antireflection film using the same, and the antireflection film, in view of the above-mentioned problems of the prior art It is providing the polarizing plate and image display apparatus which used this.

上記一般式（Ｉ）中、
Ｒｆ _１ 〜Ｒｆ _４ は、各々独立に、フッ素原子、フッ素原子を有するアルキル基、又は−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ１ Ｆで表される基を表す。
ｍ１は１以上の整数を表す。ｎ１は前記繰り返し単位の繰り返し数を表し、正の整数を表す。
Ｒｆ _１ 〜Ｒｆ _４ は、各々独立に、前記繰り返し単位間において、フッ素原子、フッ素原子を有するアルキル基、及び−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ１ Ｆで表される基のうちの異なるものであってもよい。
Ｒｆ _５ 〜Ｒｆ _８ は、各々独立に、フッ素原子、フッ素原子を有するアルキル基、又は−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ２ Ｆで表される基を表す。
ｎ _２ 及びｎ _３ は、各々独立に、正の整数を表す。ｎ _２ 及びｎ _３ が２以上のとき、２個以上のＲｆ _５ 、２個以上のＲｆ _６ 、２個以上のＲｆ _７ 、２個以上のＲｆ _８ は、各々同じでも異なっていてもよい。
ｍ２は１以上の整数を表す。
ただし、Ｒｆ _１ 〜Ｒｆ _８ の少なくとも１つは炭素数２〜８の直鎖状パーフルオロアルキル基又は−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ Ｆで表される基である。ｍは１〜１０の整数を表す。
Ｒｆ _９ 及びＲｆ _１０ は、各々独立に、水素原子、炭素数２〜８の直鎖状パーフルオロアルキル基、又は−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ３ Ｆで表される基を表す。
ｍ３は１以上の整数を表す。
Ｌ _１ は、脂肪族の（ｐ１＋１）価の連結基を表し、Ｌ _２ は脂肪族の（ｐ２＋１）価の連結基を表す。ｐ１及びｐ２は、各々独立に、２以上の整数を表す。
Ｘ _１ 及びＸ _２ は、各々独立に、（メタ）アクリロイル基を表す。
＜２＞
下記成分（Ａ）、（Ｂ）及び（Ｃ）を含有する重合性組成物。
（Ａ）フッ素原子を有するポリエーテル構造を有する繰り返し単位及び４つ以上の重合性基を有し、前記重合性基が（メタ）アクリロイル基であり、下記一般式（Ｉ）で表される化合物
（Ｂ）光重合開始剤
（Ｃ）有機溶剤
一般式（Ｉ）

上記一般式（Ｉ）中、
Ｒｆ _１ 〜Ｒｆ _４ は、各々独立に、フッ素原子、フッ素原子を有するアルキル基、又は−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ１ Ｆで表される基を表す。
ｍ１は１以上の整数を表す。ｎ１は前記繰り返し単位の繰り返し数を表し、正の整数を表す。
Ｒｆ _１ 〜Ｒｆ _４ は、各々独立に、前記繰り返し単位間において、フッ素原子、フッ素原子を有するアルキル基、及び−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ１ Ｆで表される基のうちの異なるものであってもよい。
Ｒｆ _５ 〜Ｒｆ _８ は、各々独立に、フッ素原子、フッ素原子を有するアルキル基、又は−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ２ Ｆで表される基を表す。
ｎ _２ 及びｎ _３ は、各々独立に、正の整数を表す。ｎ _２ 及びｎ _３ が２以上のとき、２個以上のＲｆ _５ 、２個以上のＲｆ _６ 、２個以上のＲｆ _７ 、２個以上のＲｆ _８ は、各々同じでも異なっていてもよい。
ｍ２は１以上の整数を表す。
Ｒｆ _９ 及びＲｆ _１０ は、各々独立に、水素原子、フッ素原子を有するアルキル基、又は−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ３ Ｆで表される基を表す。
ｍ３は１以上の整数を表す。
ｐ１及びｐ２は、各々独立に、２以上の整数を表す。
Ｘ _１ 及びＸ _２ は、各々独立に、（メタ）アクリロイル基を表す。
Ｌ _１ 及びＬ _２ は、各々独立に、下記式のいずれかで表される連結基を表す。

上記式中、Ｒはアルキル基を表し、＊は、前記一般式（Ｉ）中の隣接する酸素原子に接続する部位、＊＊はＸ _１ 又はＸ _２ に接続する部位を表す。
＜３＞
前記一般式（Ｉ）において、Ｒｆ _１ 〜Ｒｆ _８ の少なくとも１つが炭素数２〜８の直鎖状パーフルオロアルキル基又は−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ Ｆで表される基（ｍは１〜１０の整数を表す）であり、Ｒｆ _９ 及びＲｆ _１０ が水素原子、炭素数２〜８の直鎖状パーフルオロアルキル基又は前記−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ３ Ｆで表される基を表す、＜２＞に記載の重合性組成物。
＜４＞
前記化合物（Ａ）における前記繰り返し単位は、前記繰り返し単位に含まれるＲｆ _１ 〜Ｒｆ _４ 内でＲｆ _１ 〜Ｒｆ _４ が表す基の種類及び前記基の数が同一である、＜１＞〜＜３＞のいずれか１項に記載の重合性組成物。
＜５＞
透明支持体上に少なくとも１層の低屈折率層を有する反射防止フィルムであって、該低屈折率層が、＜１＞〜＜４＞のいずれか１項に記載の重合性組成物から形成される、反射防止フィルム。
＜６＞
偏光膜と該偏光膜の両面を保護する２枚の保護フィルムとを有し、該保護フィルムの少なくとも一方が＜５＞に記載の反射防止フィルムである、偏光板。
＜７＞
＜５＞に記載の反射防止フィルム又は＜６＞に記載の偏光板をディスプレイの最表面に有する、画像表示装置。
＜８＞
フッ素原子を有するポリエーテル構造を有する繰り返し単位及び４つ以上の重合性基を有し、前記重合性基が（メタ）アクリロイル基であり、下記一般式（Ｉ）で表される化合物の製造方法であって、
下記一般式（ＩＩ）で表される化合物を液相フッ素化法により処理することにより前記フッ素原子を有するポリエーテル構造を有する繰り返し単位を得る工程を有する製造方法。
一般式（Ｉ）

上記一般式（Ｉ）中、
Ｒｆ _１ 〜Ｒｆ _４ は、各々独立に、フッ素原子、フッ素原子を有するアルキル基、又は−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ１ Ｆで表される基を表す。
ｍ１は１以上の整数を表す。ｎ１は前記繰り返し単位の繰り返し数を表し、正の整数を表す。
Ｒｆ _１ 〜Ｒｆ _４ は、各々独立に、前記繰り返し単位間において、フッ素原子、フッ素原子を有するアルキル基、及び−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ１ Ｆで表される基のうちの異なるものであってもよい。
Ｒｆ _５ 〜Ｒｆ _８ は、各々独立に、フッ素原子、フッ素原子を有するアルキル基、又は−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ２ Ｆで表される基を表す。
ｍ２は１以上の整数を表す。ｎ _２ 及びｎ _３ は、各々独立に、正の整数を表す。ｎ _２ 及びｎ _３ が２以上のとき、２個以上のＲｆ _５ 、２個以上のＲｆ _６ 、２個以上のＲｆ _７ 、２個以上のＲｆ _８ は、各々同じでも異なっていてもよい。
ただし、Ｒｆ _１ 〜Ｒｆ _８ の少なくとも１つは炭素数２〜８の直鎖状パーフルオロアルキル基又は−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ Ｆで表される基である。ｍは１〜１０の整数を表す。
Ｒｆ _９ 及びＲｆ _１０ は、各々独立に、水素原子、炭素数２〜８の直鎖状パーフルオロアルキル基、又は−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ３ Ｆで表される基を表す。
ｍ３は１以上の整数を表す。
Ｌ _１ は、脂肪族の（ｐ１＋１）価の連結基を表し、Ｌ _２ は脂肪族の（ｐ２＋１）価の連結基を表す。ｐ１及びｐ２は、各々独立に、２以上の整数を表す。
Ｘ _１ 及びＸ _２ は、各々独立に、（メタ）アクリロイル基を表す。
一般式（ＩＩ）

上記一般式（ＩＩ）中、
Ａ及びＢは、各々独立に、水酸基の保護基を表す。
Ｒ _１ 〜Ｒ _４ は、各々独立に、水素原子、アルキル基、又は−ＣＨ _２ −Ｏ−（ＣＨ _２ ） _ｍ１ Ｈで表される基を表す。ｍ１は１以上の整数を表す。ｎは正の整数を表す。
Ｒ _１ 〜Ｒ _４ は、各々独立に、上記一般式（ＩＩ）で表される繰り返し単位間において、水素原子、アルキル基、及び−ＣＨ _２ −Ｏ−（ＣＨ _２ ） _ｍ１ Ｈで表される基のうちの異なるものであってもよい。
＜９＞
フッ素原子を有するポリエーテル構造を有する繰り返し単位及び４つ以上の重合性基を有し、前記重合性基が（メタ）アクリロイル基であり、下記一般式（Ｉ）で表される化合物の製造方法であって、
下記一般式（ＩＩ）で表される化合物を液相フッ素化法により処理することにより前記フッ素原子を有するポリエーテル構造を有する繰り返し単位を得る工程を有する製造方法。
一般式（Ｉ）

上記一般式（Ｉ）中、
Ｒｆ _１ 〜Ｒｆ _４ は、各々独立に、フッ素原子、フッ素原子を有するアルキル基、又は−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ１ Ｆで表される基を表す。
ｍ１は１以上の整数を表す。ｎ１は前記繰り返し単位の繰り返し数を表し、正の整数を表す。
Ｒｆ _１ 〜Ｒｆ _４ は、各々独立に、前記繰り返し単位間において、フッ素原子、フッ素原子を有するアルキル基、及び−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ１ Ｆで表される基のうちの異なるものであってもよい。
Ｒｆ _５ 〜Ｒｆ _８ は、各々独立に、フッ素原子、フッ素原子を有するアルキル基、又は−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ２ Ｆで表される基を表す。
ｍ２は１以上の整数を表す。ｎ _２ 及びｎ _３ は、各々独立に、正の整数を表す。ｎ _２ 及びｎ _３ が２以上のとき、２個以上のＲｆ _５ 、２個以上のＲｆ _６ 、２個以上のＲｆ _７ 、２個以上のＲｆ _８ は、各々同じでも異なっていてもよい。
Ｒｆ _９ 及びＲｆ _１０ は、各々独立に、水素原子、フッ素原子を有するアルキル基、又は−ＣＦ _２ −Ｏ−（ＣＦ _２ ） _ｍ３ Ｆで表される基を表す。
ｍ３は１以上の整数を表す。
ｐ１及びｐ２は、各々独立に、２以上の整数を表す。
Ｘ _１ 及びＸ _２ は、各々独立に、（メタ）アクリロイル基を表す。
Ｌ _１ 及びＬ _２ は、各々独立に、下記式のいずれかで表される連結基を表す。

上記式中、Ｒはアルキル基を表し、＊は、前記一般式（Ｉ）中の隣接する酸素原子に接続する部位、＊＊はＸ _１ 又はＸ _２ に接続する部位を表す。
一般式（ＩＩ）

上記一般式（ＩＩ）中、
Ａ及びＢは、各々独立に、水酸基の保護基を表す。
Ｒ _１ 〜Ｒ _４ は、各々独立に、水素原子、アルキル基、又は−ＣＨ _２ −Ｏ−（ＣＨ _２ ） _ｍ１ Ｈで表される基を表す。ｍ１は１以上の整数を表す。ｎは正の整数を表す。
Ｒ _１ 〜Ｒ _４ は、各々独立に、上記一般式（ＩＩ）で表される繰り返し単位間において、水素原子、アルキル基、及び−ＣＨ _２ −Ｏ−（ＣＨ _２ ） _ｍ１ Ｈで表される基のうちの異なるものであってもよい。
＜１０＞
前記一般式（ＩＩ）で表される化合物を、下記一般式（ＩＩＩ）で表される化合物のエポキシ環を開環重合して得る工程を更に有する、＜８＞又は＜９＞に記載の製造方法。
一般式（ＩＩＩ）

上記一般式（ＩＩＩ）中、Ｒ _１ 〜Ｒ _４ は、前記一般式（ＩＩ）におけるＲ _１ 〜Ｒ _４ と同義である。
本発明は、上記＜１＞〜＜１０＞に係る発明であるが、以下、それ以外の事項（例えば、下記〔１〕〜〔１０〕）についても記載している。 As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the following problems can be solved and the object can be achieved, and the present invention has been completed based on the above knowledge. .
<1>
A polymerizable composition containing the following components (A), (B) and (C).
(A) A compound having a repeating unit having a polyether structure having a fluorine atom and four or more polymerizable groups, wherein the polymerizable group is a (meth) acryloyl group and represented by the following general formula (I)
(B) Photopolymerization initiator
(C) Organic solvent
Formula (I)

In the general formula (I),
Rf ₁ ~Rf ₄ each independently represents a fluorine atom, an alkyl group having a fluorine atom, or a _{-CF 2} -O- _{(CF 2)} a group represented by _m1 F.
m1 represents an integer of 1 or more. n1 represents the number of repeating units and represents a positive integer.
Rf ₁ ~Rf ₄ are each independently, between the repeating units, a fluorine atom, an alkyl group having a fluorine atom, and _{-CF 2} -O- _{(CF 2)} different ones of the groups represented by _m1 F It may be.
Rf ₅ ~Rf ₈ each independently represents a fluorine atom, an alkyl group having a fluorine atom, or a _{-CF 2} -O- _{(CF 2)} a group represented by _{m @ 2} F.
n ₂ and n ₃ each independently represent a positive integer. When n ₂ and n ₃ are 2 or more, 2 or more Rf ₅ , 2 or more Rf ₆ , 2 or more Rf ₇ , and 2 or more Rf ₈ may be the same or different.
m2 represents an integer of 1 or more.
Provided _that at least one of Rf 1 ~Rf ₈ is a linear perfluoro alkyl group or _-CF 2 -O- _{(CF 2)} a group represented by _m F 2 to 8 carbon atoms. m represents an integer of 1 to 10.
Rf ₉ and Rf ₁₀ each independently represent a hydrogen atom, a linear perfluoroalkyl group having 2 to 8 carbon atoms, or a group represented by —CF ₂ —O— (CF ₂ ) _m3 F.
m3 represents an integer of 1 or more.
L ₁ represents an aliphatic (p1 + 1) -valent linking group, and L ₂ represents an aliphatic (p2 + 1) -valent linking group. p1 and p2 each independently represent an integer of 2 or more.
X ₁ and X ₂ each independently represents a (meth) acryloyl group.
<2>
A polymerizable composition containing the following components (A), (B) and (C).
(A) A compound having a repeating unit having a polyether structure having a fluorine atom and four or more polymerizable groups, wherein the polymerizable group is a (meth) acryloyl group and represented by the following general formula (I)
(B) Photopolymerization initiator
(C) Organic solvent
Formula (I)

In the general formula (I),
Rf ₁ ~Rf ₄ each independently represents a fluorine atom, an alkyl group having a fluorine atom, or a _{-CF 2} -O- _{(CF 2)} a group represented by _m1 F.
m1 represents an integer of 1 or more. n1 represents the number of repeating units and represents a positive integer.
Rf ₁ ~Rf ₄ are each independently, between the repeating units, a fluorine atom, an alkyl group having a fluorine atom, and _{-CF 2} -O- _{(CF 2)} different ones of the groups represented by _m1 F It may be.
Rf ₅ ~Rf ₈ each independently represents a fluorine atom, an alkyl group having a fluorine atom, or a _{-CF 2} -O- _{(CF 2)} a group represented by _{m @ 2} F.
n ₂ and n ₃ each independently represent a positive integer. When n ₂ and n ₃ are 2 or more, 2 or more Rf ₅ , 2 or more Rf ₆ , 2 or more Rf ₇ , and 2 or more Rf ₈ may be the same or different.
m2 represents an integer of 1 or more.
Rf ₉ and Rf ₁₀ each independently represent a hydrogen atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m3 F.
m3 represents an integer of 1 or more.
p1 and p2 each independently represent an integer of 2 or more.
X ₁ and X ₂ each independently represents a (meth) acryloyl group.
L ₁ and L ₂ each independently represent a linking group represented by any of the following formulae.

In the above formulas, R represents an alkyl group, * is the site to be connected to the adjacent oxygen atom in the general formula (I), ** represents a site connecting to X ₁ or X _2.
<3>
In the general formula _(I), Rf 1 at least one ～Rf ₈ is linear perfluoroalkyl group or _-CF 2 -O- _{(CF 2)} 2 to 8 carbon atoms group represented by _m F (m Represents an integer of 1 to 10, and Rf ₉ and Rf ₁₀ are each represented by a hydrogen atom, a linear perfluoroalkyl group having 2 to 8 carbon atoms, or the aforementioned —CF ₂ —O— (CF ₂ ) _{m 3} F. The polymerizable composition according to <2>, which represents a group to be formed.
<4>
The repeating units in the compound (A), the number of types and the group of radicals represented by _Rf 1 _{~Rf 4} in the _Rf 1 _{~Rf 4} included in the repeating units are identical, <1> to <3 The polymerizable composition according to any one of the above.
<5>
An antireflection film having at least one low refractive index layer on a transparent support, wherein the low refractive index layer is formed from the polymerizable composition according to any one of <1> to <4>. Antireflection film.
<6>
A polarizing plate comprising a polarizing film and two protective films protecting both surfaces of the polarizing film, wherein at least one of the protective films is the antireflection film according to <5>.
<7>
<5> The image display apparatus which has the antireflection film as described in <5>, or the polarizing plate as described in <6> on the outermost surface of a display.
<8>
A method for producing a compound having a repeating unit having a polyether structure having a fluorine atom and four or more polymerizable groups, wherein the polymerizable group is a (meth) acryloyl group and represented by the following general formula (I) Because
The manufacturing method which has the process of obtaining the repeating unit which has the polyether structure which has the said fluorine atom by processing the compound represented with the following general formula (II) by a liquid phase fluorination method.
Formula (I)

In the general formula (I),
Rf ₁ ~Rf ₄ each independently represents a fluorine atom, an alkyl group having a fluorine atom, or a _{-CF 2} -O- _{(CF 2)} a group represented by _m1 F.
m1 represents an integer of 1 or more. n1 represents the number of repeating units and represents a positive integer.
Rf ₁ ~Rf ₄ are each independently, between the repeating units, a fluorine atom, an alkyl group having a fluorine atom, and _{-CF 2} -O- _{(CF 2)} different ones of the groups represented by _m1 F It may be.
Rf ₅ ~Rf ₈ each independently represents a fluorine atom, an alkyl group having a fluorine atom, or a _{-CF 2} -O- _{(CF 2)} a group represented by _{m @ 2} F.
m2 represents an integer of 1 or more. n ₂ and n ₃ each independently represent a positive integer. When n ₂ and n ₃ are 2 or more, 2 or more Rf ₅ , 2 or more Rf ₆ , 2 or more Rf ₇ , and 2 or more Rf ₈ may be the same or different.
Provided _that at least one of Rf 1 ~Rf ₈ is a linear perfluoro alkyl group or _-CF 2 -O- _{(CF 2)} a group represented by _m F 2 to 8 carbon atoms. m represents an integer of 1 to 10.
Rf ₉ and Rf ₁₀ each independently represent a hydrogen atom, a linear perfluoroalkyl group having 2 to 8 carbon atoms, or a group represented by —CF ₂ —O— (CF ₂ ) _m3 F.
m3 represents an integer of 1 or more.
L ₁ represents an aliphatic (p1 + 1) -valent linking group, and L ₂ represents an aliphatic (p2 + 1) -valent linking group. p1 and p2 each independently represent an integer of 2 or more.
X ₁ and X ₂ each independently represents a (meth) acryloyl group.
Formula (II)

In the general formula (II),
A and B each independently represent a hydroxyl-protecting group.
R _{1 to} R ₄ each independently represent a hydrogen atom, an alkyl group, or a group represented by —CH ₂ —O— (CH ₂ ) _m1 H. m1 represents an integer of 1 or more. n represents a positive integer.
R _{1 to} R ₄ are each independently a hydrogen atom, an alkyl group, or a group represented by —CH ₂ —O— (CH ₂ ) _m1 H between the repeating units represented by the general formula (II). May be different.
<9>
A method for producing a compound having a repeating unit having a polyether structure having a fluorine atom and four or more polymerizable groups, wherein the polymerizable group is a (meth) acryloyl group and represented by the following general formula (I) Because
The manufacturing method which has the process of obtaining the repeating unit which has the polyether structure which has the said fluorine atom by processing the compound represented with the following general formula (II) by a liquid phase fluorination method.
Formula (I)

In the general formula (I),
Rf ₁ ~Rf ₄ each independently represents a fluorine atom, an alkyl group having a fluorine atom, or a _{-CF 2} -O- _{(CF 2)} a group represented by _m1 F.
m1 represents an integer of 1 or more. n1 represents the number of repeating units and represents a positive integer.
Rf ₁ ~Rf ₄ are each independently, between the repeating units, a fluorine atom, an alkyl group having a fluorine atom, and _{-CF 2} -O- _{(CF 2)} different ones of the groups represented by _m1 F It may be.
Rf ₅ ~Rf ₈ each independently represents a fluorine atom, an alkyl group having a fluorine atom, or a _{-CF 2} -O- _{(CF 2)} a group represented by _{m @ 2} F.
m2 represents an integer of 1 or more. n ₂ and n ₃ each independently represent a positive integer. When n ₂ and n ₃ are 2 or more, 2 or more Rf ₅ , 2 or more Rf ₆ , 2 or more Rf ₇ , and 2 or more Rf ₈ may be the same or different.
Rf ₉ and Rf ₁₀ each independently represent a hydrogen atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m3 F.
m3 represents an integer of 1 or more.
p1 and p2 each independently represent an integer of 2 or more.
X ₁ and X ₂ each independently represents a (meth) acryloyl group.
L ₁ and L ₂ each independently represent a linking group represented by any of the following formulae.

In the above formulas, R represents an alkyl group, * is the site to be connected to the adjacent oxygen atom in the general formula (I), ** represents a site connecting to X ₁ or X _2.
Formula (II)

In the general formula (II),
A and B each independently represent a hydroxyl-protecting group.
R _{1 to} R ₄ each independently represent a hydrogen atom, an alkyl group, or a group represented by —CH ₂ —O— (CH ₂ ) _m1 H. m1 represents an integer of 1 or more. n represents a positive integer.
R _{1 to} R ₄ are each independently a hydrogen atom, an alkyl group, or a group represented by —CH ₂ —O— (CH ₂ ) _m1 H between the repeating units represented by the general formula (II). May be different.
<10>
The production according to <8> or <9>, further comprising a step of obtaining the compound represented by the general formula (II) by ring-opening polymerization of an epoxy ring of the compound represented by the following general formula (III). Method.
Formula (III)

In the general formula _(III), R 1 ~R ₄ have the same meanings as _R 1 to R ₄ in the general formula (II).
Although this invention is invention which concerns on said <1>-<10>, below, other matters (for example, following [1]-[10]) are also described.

[1]
A polymerizable composition containing the following components (A), (B) and (C).
(A) A compound having a repeating unit having a polyether structure having a fluorine atom and four or more polymerizable groups, and represented by the following general formula (I) (B) Photopolymerization initiator (C) Organic solvent in general Formula (I)

In the general formula (I),
Rf _{1 to} Rf ₄ each independently represent a fluorine atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m1 F.
m1 represents an integer of 1 or more. n1 represents the number of repeating units and represents a positive integer.
Rf _{5 to} Rf ₈ each independently represent a fluorine atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m2 F.
n ₂ and n ₃ each independently represent a positive integer. When n ₂ and n ₃ are 2 or more, 2 or more Rf ₅ , 2 or more Rf ₆ , 2 or more Rf ₇ , or 2 or more Rf ₈ may be the same or different.
m2 represents an integer of 1 or more.
Rf ₉ and Rf ₁₀ each independently represent a hydrogen atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m3 F.
m3 represents an integer of 1 or more.
L ₁ represents an aliphatic (p1 + 1) -valent linking group, and L ₂ represents an aliphatic (p2 + 1) -valent linking group. p1 and p2 each independently represent an integer of 2 or more.
X ₁ and X ₂ each independently represent a group having a polymerizable group.
[2]
The polymerizable composition according to [1], wherein the types of groups represented by Rf _{1 to} Rf ₄ and the number of the groups are the same between the repeating units in the compound (A).
[3]
In the general formula _(I), Rf 1 at least one ～Rf ₈ is linear perfluoroalkyl group or _-CF 2 -O- _{(CF 2)} 2 to 8 carbon atoms group represented by _m F (m Represents an integer of 1 to 10, and Rf ₉ and Rf ₁₀ are each represented by a hydrogen atom, a linear perfluoroalkyl group having 2 to 8 carbon atoms, or the aforementioned —CF ₂ —O— (CF ₂ ) _{m 3} F. The polymerizable composition according to [1] or [2], which represents a group to be formed.
[4]
The polymerizable composition according to any one of [1] to [3], wherein L ₁ and L ₂ in the general formula (I) are each independently a linking group represented by any of the following formulas: object.

In the above formula, R represents a hydrogen atom or an alkyl group, * represents a site connected to an adjacent oxygen atom in the general formula (I), and ** represents a site connected to X ₁ or X ₂ .
[5]
The polymerizable composition according to any one of [1] to [4], wherein the group having a polymerizable group for X ₁ or X ₂ in the compound (A) is a (meth) acryloyl group.
[6]
An antireflection film having at least one low refractive index layer on a transparent support, wherein the low refractive index layer is formed from the polymerizable composition according to any one of [1] to [5] Antireflection film.
[7]
A polarizing plate comprising a polarizing film and two protective films for protecting both surfaces of the polarizing film, wherein at least one of the protective films is the antireflection film according to [6].
[8]
The image display apparatus which has the antireflection film as described in [6], or the polarizing plate as described in [7] on the outermost surface of a display.
[9]
A method for producing a compound having a repeating unit having a polyether structure having a fluorine atom and four or more polymerizable groups and represented by the following general formula (I),
The manufacturing method which has the process of obtaining the repeating unit which has the polyether structure which has the said fluorine atom by processing the compound represented with the following general formula (II) by a liquid phase fluorination method.
Formula (I)

In the general formula (I),
Rf _{1 to} Rf ₄ each independently represent a fluorine atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m1 F.
m1 represents an integer of 1 or more.
n1 represents the number of repeating units and represents a positive integer.
Rf _{5 to} Rf ₈ each independently represent a fluorine atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m2 F.
m2 represents an integer of 1 or more. n ₂ and n ₃ each independently represent a positive integer. When n ₂ and n ₃ are 2 or more, 2 or more Rf ₅ , 2 or more Rf ₆ , 2 or more Rf ₇ , or 2 or more Rf ₈ may be the same or different.
Rf ₉ and Rf ₁₀ each independently represent a hydrogen atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m3 F.
m3 represents an integer of 1 or more.
L ₁ represents an aliphatic (p1 + 1) -valent linking group, and L ₂ represents an aliphatic (p2 + 1) -valent linking group. p1 and p2 each independently represent an integer of 2 or more.
X ₁ and X ₂ each independently represent a group having a polymerizable group.
Formula (II)

In the general formula (II),
A and B each independently represent a hydroxyl-protecting group.
R _{1 to} R ₄ each independently represent a hydrogen atom, an alkyl group, or a group represented by —CH ₂ —O— (CH ₂ ) _m1 H. m1 represents an integer of 1 or more. n represents a positive integer.
[10]
[9] The production method according to [9], further comprising a step of obtaining the compound represented by the general formula (II) by ring-opening polymerization of an epoxy ring of a compound represented by the following general formula (III).
Formula (III)

In the general formula _(III), R 1 ~R ₄ have the same meanings as _R 1 to R ₄ in the general formula (II).

The polymerizable composition of the present invention has a low refractive index of the resulting film and is excellent in antifouling properties and scratch resistance.
Since the antireflective film of the present invention uses the polymerizable composition, it is easy to wipe off even if an oil or fat component such as fingerprints or sebum adheres, and has excellent antifouling property and excellent scratch resistance.
According to the antireflection film of the present invention, a polarizing plate and an image display device excellent in antifouling properties and scratch resistance can be provided.

  The present invention will be described below. However, the present invention is not limited by the following description. In the present specification, when a numerical value represents a physical property value, a characteristic value, etc., the description “(numerical value 1) to (numerical value 2)” means “(numerical value 1) or more and (numerical value 2) or less”. . In the present specification, the description “(meth) acrylate” means “at least one of acrylate and methacrylate”. The same applies to “(meth) acryloyl group”, “(meth) acrylic acid” and the like.

The polymerizable composition of the present invention contains at least the following components (A), (B) and (C).
(A) A compound having a repeating unit having a polyether structure having a fluorine atom and four or more polymerizable groups, and represented by the following general formula (I) (B) Photopolymerization initiator (C) Organic solvent in general Formula (I)

In the general formula (I),
Rf _{1 to} Rf ₄ each independently represent a fluorine atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m1 F.
m1 represents an integer of 1 or more. n1 represents the number of repeating units and represents a positive integer.
Rf _{5 to} Rf ₈ each independently represent a fluorine atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m2 F.
m2 represents an integer of 1 or more.
n ₂ and n ₃ each independently represent a positive integer. When n ₂ and n ₃ are 2 or more, 2 or more Rf ₅ , 2 or more Rf ₆ , 2 or more Rf ₇ , or 2 or more Rf ₈ may be the same or different.
Rf ₉ and Rf ₁₀ each independently represent a hydrogen atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m3 F.
m3 represents an integer of 1 or more.
L ₁ represents an aliphatic (p1 + 1) -valent linking group, and L ₂ represents an aliphatic (p2 + 1) -valent linking group. p1 and p2 each independently represent an integer of 2 or more.
X ₁ and X ₂ each independently represent a polymerizable group.

First, a compound (A) represented by the general formula (I) (hereinafter simply referred to as “general formula (I)”, which has a repeating unit having a polyether structure having a fluorine atom and four or more polymerizable groups. Compound (A) ”) will be described.
In the present invention, the compound (A) represented by the general formula (I) can function as an antifouling agent.
The polyether structure having a fluorine atom is preferably a perfluoropolyether structure from the viewpoint of antifouling properties.
In the general formula (I), Rf _{1 to} Rf ₄ each independently represent a fluorine atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m1 F.
The alkyl group having a fluorine atom for Rf _{1 to} Rf ₄ is preferably a linear alkyl group having a fluorine atom having 1 to 10 carbon atoms, and a linear perfluoroalkyl group having 1 to 10 carbon atoms. It is more preferable that
m1 represents an integer of 1 or more, preferably an integer of 1 to 10, and more preferably an integer of 2 to 8.
Rf _{1 to} Rf ₄ may be different between the repeating units in the compound (A), but the groups represented by Rf _{1 to} Rf ₄ are different between the repeating units in the compound (A). It is preferable that the kind and the number of the groups are the same. In addition, regioisomerism in which the position of the group represented by Rf _{1 to} Rf ₄ (bonding position to the polyether structure main chain having a fluorine atom) is different between the repeating units in the compound (A) may be used. .
The alkyl group having a fluorine atom for Rf _{1 to} Rf ₄ is preferably a linear perfluoroalkyl group having 2 to 8 carbon atoms, such as a perfluoromethyl group, a perfluoroethyl group, a perfluoropropyl group, Perfluorobutyl group, perfluoropentyl group, perfluorohexyl group, perfluoroheptyl group, perfluorooctyl group, and the like. Perfluoroethyl group, perfluoropropyl group, perfluorobutyl group, perfluoropentyl group, perfluoropentyl group It is preferably a fluorohexyl group, a perfluoroheptyl group or a perfluorooctyl group.
Rf _{1 to} Rf ₄ are preferably a linear perfluoroalkyl group having 2 to 8 carbon atoms or a group represented by —CF ₂ —O— (CF ₂ ) _m1 F. More preferably, it is an 8 linear perfluoroalkyl group.
At least one of Rf _{1 to} Rf ₄ is preferably a linear perfluoroalkyl group having 2 to 8 carbon atoms or a group represented by —CF ₂ —O— (CF ₂ ) _m1 F, and Rf _{1 to} Rf More preferably, at least one of _{4 is} a linear perfluoroalkyl group having 2 to 8 carbon atoms.
n1 represents the number of repeating units, and represents a positive integer, preferably an integer of 3 to 50, and more preferably an integer of 8 to 20.

Rf _{5 to} Rf ₈ each independently represent a fluorine atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m2 F.
The alkyl group having a fluorine atom for Rf _{5 to} Rf ₈ is preferably a linear alkyl group having a fluorine atom having 1 to 10 carbon atoms, and a linear perfluoroalkyl group having 1 to 10 carbon atoms. It is more preferable that
m2 represents an integer of 1 or more, and m2 is preferably an integer of 1 to 10, and more preferably an integer of 2 to 8.
Rf _{5 to} Rf ₈ are preferably a linear perfluoroalkyl group having 2 to 8 carbon atoms or a group represented by —CF ₂ —O— (CF ₂ ) _m2 F, More preferably, it is an 8 linear perfluoroalkyl group.
Preferably at least one of Rf ₅ ~Rf ₈ is a linear perfluoro alkyl group or _{-CF 2} -O- _{(CF 2)} a group represented by _{m @ 2} F 2 to 8 carbon _atoms, Rf 5 _~Rf more preferably ₈ at least one of a straight-chain perfluoroalkyl group of 2 to 8 carbon atoms, perfluoroethyl group, perfluoropropyl group, perfluorobutyl group, perfluorobutyl group, perfluorohexyl group, A perfluoroheptyl group or a perfluorooctyl group is particularly preferable.
n2 and n3 each independently represent a positive integer. n2 and n3 are preferably 1 or 2, and n2 and n3 are more preferably 2 from the viewpoint of solubility in an organic solvent.
Rf ₉ and Rf ₁₀ each independently represent a hydrogen atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m3 F.
The alkyl group having a fluorine atom for Rf ₉ and Rf ₁₀ is preferably a linear alkyl group having a fluorine atom having 1 to 10 carbon atoms, and a linear perfluoroalkyl group having 1 to 10 carbon atoms. It is more preferable that
m3 represents an integer of 1 or more, preferably an integer of 1 to 10, and more preferably an integer of 2 to 8.
Rf ₉ and Rf ₁₀ are preferably each independently a hydrogen atom or a linear perfluoroalkyl group having 2 to 8 carbon atoms, preferably a hydrogen atom, a perfluoroethyl group, a perfluoropropyl group, or a perfluorobutyl group. A perfluoropentyl group, a perfluorohexyl group, a perfluoroheptyl group or a perfluorooctyl group is particularly preferable.
In the present _invention, the at least one linear perfluoro alkyl group or _-CF 2 -O- _{(CF 2)} a group represented by _m F 2 to 8 carbon atoms (m of Rf 1 ~Rf ₈ 1~10 Rf ₉ and Rf ₁₀ are each a hydrogen atom, a linear perfluoroalkyl group having 2 to 8 carbon atoms, or a group represented by the aforementioned —CF ₂ —O— (CF ₂ ) _m3 F. particularly preferably _represents, Rf 1 at least one ～Rf ₈ is a linear perfluoroalkyl group having 2 to 8 carbon atoms, Rf ₉ and _{Rf 10} is a hydrogen atom or a C2-8 straight par Most preferred is a fluoroalkyl group.
L ₁ represents an aliphatic (p1 + 1) -valent linking group, and L ₂ represents an aliphatic (p2 + 1) -valent linking group. p1 and p2 each independently represent an integer of 2 or more.
Each of p1 and p2 is preferably independently an integer of 2 to 8, and more preferably an integer of 2 to 5.
Aliphatic (p1 + 1) -valent linking group for L _1, examples of aliphatic (p2 + 1) -valent linking group for L _2, ether bond, at least one selected from the group consisting of carbonyl and amino groups And a linking group comprising a branched hydrocarbon chain.
The branched hydrocarbon chain is preferably a branched hydrocarbon chain having 3 to 10 carbon atoms.
L ₁ and L ₂ in the general formula (I) are more preferably a linking group represented by any of the following formulas.

In the above formula, R represents a hydrogen atom or an alkyl group, * represents a site connected to an adjacent oxygen atom in the general formula (I), and ** represents a site connected to X ₁ or X ₂ .
The alkyl group for R is preferably an alkyl group having 1 to 8 carbon atoms, and examples thereof include a methyl group, an ethyl group, and a propyl group.
X ₁ and X ₂ each independently represent a group having a polymerizable group, and examples of the polymerizable group in X ₁ and X ₂ include a (meth) acryloyl group, a vinyl group, an aryl group, a cinnamoyl group, and an epoxy group. , An oxetanyl group, a hydroxyl group, a polyoxyalkylene group, a carboxyl group, or an amino group is preferable, and a (meth) acryloyl group is more preferable.
Examples of the aryl group include a phenyl group.
Examples of the polyoxyalkylene group include a polyoxyethylene group.

The weight average molecular weight of the compound (A) represented by the general formula (I) is preferably 500 or more and less than 10,000, more preferably 800 or more and less than 5000, as a polystyrene converted value by GPC (gel permeation chromatography) method. Most preferably, it is 1000 or more and less than 3000. A weight average molecular weight of less than 10,000 is preferable from the viewpoint of good solubility in the organic solvent (C). Moreover, it is preferable from a viewpoint that antifouling property fully expresses that a weight average molecular weight is 500 or more.
Specific examples of the compound (A) represented by the general formula (I) are shown below, but the present invention is not limited thereto.

  In the polymerizable composition of the present invention, the content of the compound (A) represented by the general formula (I) is preferably 0.1 to 30% by mass based on the total solid content of the composition. 1 to 20% by mass is more preferable, and 5 to 10% by mass is even more preferable.

Next, a method for producing the compound (A) represented by the general formula (I) will be described.
The present invention also relates to a method for producing the compound (A) represented by the general formula (I).
As a method for producing the compound (A) having a repeating unit having a polyether structure having a fluorine atom and four or more polymerizable groups and represented by the general formula (I) of the present invention, There is no particular limitation as long as the compound (A) represented by (I) can be produced. For example, a repeating unit having a polyether structure having a fluorine atom in the compound (A) represented by the general formula (I) is used. The compound having a repeating unit having a corresponding polyether structure can be produced by treating with a perfluorination reaction.
As the perfluorination reaction, a known method can be used, and examples thereof include a liquid phase fluorination method, an aerosol fluorination method, an electrolytic fluorination method, a fluorination method with cobalt fluoride, and the like. The liquid phase fluorination method is more preferable because of its high yield.

It is preferable that it is a manufacturing method which has the process of obtaining the repeating unit which has the said polyether structure which has the said fluorine atom by processing the compound represented with the following general formula (II) by a liquid phase fluorination method.
Formula (II)

In the general formula (II),
A and B each independently represent a hydroxyl-protecting group.
The protecting group for A and B is not particularly limited as long as the hydroxyl group can be protected, and examples thereof include an acyl group, an arylcarbonyl group, and an alkyl group.
The acyl group, arylcarbonyl group and alkyl group as protective groups for A and B may have a substituent, and examples of the substituent include a fluorine atom.
R _{1 to} R ₄ each independently represent a hydrogen atom, an alkyl group, or a group represented by —CH ₂ —O— (CH ₂ ) _m1 H. m1 represents an integer of 1 or more.
Each of R _{1 to} R ₄ may be different between each repeating unit in the compound represented by the general formula (II), but between each repeating unit in the compound represented by the general formula (II) The groups represented by R _{1 to} R ₄ and the number of the groups are preferably the same. In addition, even if the position of the group represented by R _{1 to} R ₄ (bonding position to the repeating structure main chain) differs between the repeating units in the compound represented by the general formula (II), Good.
The alkyl group for R _{1 to} R ₄ is preferably a linear alkyl group having 1 to 10 carbon atoms, more preferably a linear alkyl group having 2 to 8 carbon atoms, a methyl group, An ethyl group, a propyl group, a butyl group, etc. are mentioned.
m1 is preferably an integer of 1 to 10, and more preferably an integer of 2 to 8.
At least one of R _{1 to} R ₄ is preferably a linear alkyl group having 2 to 8 carbon atoms or a group represented by —CH ₂ —O— (CH ₂ ) _m1 H, and R _{1 to} R ₄ More preferably, at least one is a linear alkyl group having 2 to 8 carbon atoms.
n represents a positive integer, preferably an integer of 3 to 52, more preferably an integer of 5 to 52, and still more preferably an integer of 10 to 20.
Specific examples of the compound represented by the general formula (II) are illustrated below, but the present invention is not limited thereto.

When the liquid phase fluorination method is used, the liquid phase may be the compound itself, but is preferably a solvent that does not participate in the product or reaction. As the solvent, a solvent inert to the perfluorination reaction is more preferable, and a solvent inert to the perfluorination reaction capable of dissolving 1% by mass or more of the compound is particularly preferable.
Specific examples of the solvent include known solvents used as liquid phase fluorination solvents, for example, perfluorocarbons such as Fluorinert FC-72 (trade name, manufactured by 3M), GALDEN HT-70 (product) And perfluoroamines such as perfluorotributylamine, anhydrous hydrogen fluoride, and the like.
The solvent used in the reaction is preferably the perfluorocarbons, and more preferably perfluorocarbons having a boiling point of 85 ° C. or lower. The mass of the solvent used in the reaction is preferably 3 to 10000 times, more preferably 5 to 1000 times, and particularly preferably 5 to 200 times the mass of the compound.

The fluorine gas used in the liquid phase fluorination method may be used as it is, but is preferably diluted with a gas or solvent inert to the fluorine gas, and more preferably a gas inert to the fluorine gas. It is particularly preferred to dilute and use.
Examples of the gas inert to the fluorine gas include helium gas and nitrogen gas, but nitrogen gas is more preferable for economic reasons. The volume concentration of the fluorine gas in the nitrogen gas is preferably 5% or more, and more preferably 10% or more. The fluorine used for the fluorination reaction is preferably 1 to 100 times the minimum amount necessary for perfluorinating a compound to be subjected to perfluorination (for example, the compound represented by the general formula (II)). 1 to 10 times is more preferable. The minimum amount of fluorine necessary for perfluorination is calculated from the total number of moieties that can be perfluorinated and the number of fluorine molecules necessary for perfluorination of that moiety. Examples of the portion that can be perfluorinated and the number of necessary fluorine molecules include one molecule for one carbon-hydrogen bond, one molecule for one carbon-carbon double bond, and two carbon-carbon atoms. Two fluorine molecules per one double bond. To give a more specific example, in order to perfluorinate 1 mol of a compound having 6 carbon-hydrogen bonds, 2 carbon-carbon double bonds and 1 carbon-carbon triple bond in the molecule, The necessary amount of fluorine is calculated to be 10 mol.

  The reaction type of the liquid phase fluorination method may be batch type or continuous type. In the embodiment of the present invention, it is performed in a batch mode.

  The reaction temperature by the liquid phase fluorination method is preferably not higher than the boiling point of the solvent. From the point of reaction yield and industrial implementation, it is more preferable to set it to -40 to +100 degreeC, and it is especially preferable to set it to -20 to +60 degreeC.

  Although the reaction pressure by the liquid phase fluorination method is not particularly limited, it is usually preferably from atmospheric pressure to 1 MPa from the viewpoint of industrial implementation.

  In the reaction by the liquid phase fluorination method, hydrogen atoms are replaced with fluorine atoms, and hydrogen fluoride is by-produced. When a solvent other than hydrogen fluoride is used, a hydrogen fluoride scavenger (for example, sodium fluoride) is added to the reactor for the purpose of removing this by-product hydrogen fluoride. Install a hydrogen fluoride scavenger (for example, a gas purification tube filled with sodium fluoride), cool the gas (outlet gas) exiting from the gas outlet of the reactor and separate the liquefied hydrogen fluoride, gas scrubber at the outlet gas It is preferable to perform processing such as guiding to processing. When adding a hydrogen fluoride scavenger into the reactor, it is preferable to add an excess scavenger. For example, when sodium fluoride is added as a scavenger, it is preferable to add 1 to 100 times the molar ratio with respect to by-produced hydrogen fluoride, and 1 to 10 times the molar ratio. More preferred.

In the compound represented by the general formula (II), the types of groups represented by Rf _{1 to} Rf ₄ and the number of the groups are the same among the repeating units in the compound (A) to be produced. Therefore, it is preferable to obtain the epoxy ring of the compound represented by the following general formula (III) by ring-opening polymerization.
Formula (III)

In the general formula _(III), R 1 ~R ₄ have the same meanings as _R 1 to R ₄ in the general formula (II).

(B) Photopolymerization initiator The polymerizable composition of the present invention contains a photopolymerization initiator (B).
As photopolymerization initiators, acetophenones, benzoins, benzophenones, phosphine oxides, ketals, anthraquinones, thioxanthones, azo compounds, peroxides, 2,3-dialkyldione compounds, disulfide compounds, Examples include fluoroamine compounds, aromatic sulfoniums, lophine dimers, onium salts, borate salts, active esters, active halogens, inorganic complexes, and coumarins. The photopolymerization initiator is also described in paragraphs [0141] to [0159] of JP-A-2008-134585, and can be suitably used in the present invention as well.

  “Latest UV Curing Technology” {Technical Information Association, Inc.} (1991), p. 159, and “UV Curing System” written by Kiyomi Kato (published by the General Technology Center in 1989), p. Various examples are also described in 65-148 and are useful in the present invention.

  Commercially available photocleavable photoradical polymerization initiators include “Irgacure 651”, “Irgacure 184”, “Irgacure 819”, “Irgacure 907”, “Irgacure 1870” (CGI) manufactured by Ciba Specialty Chemicals Co., Ltd. -403 / Irg184 = 7/3 mixing initiator), "Irgacure 500", "Irgacure 369", "Irgacure 1173", "Irgacure 2959", "Irgacure 4265", "Irgacure 4263", "Irgacure 127", "OXE01 “Kaya Cure DETX-S”, “Kaya Cure BP-100”, “Kaya Cure BDK”, “Kaya Cure CTX”, “Kaya Cure BMS”, “Kaya Cure 2-EAQ”, “Kaya Cure ABQ” manufactured by Nippon Kayaku Co., Ltd. ”,“ Kayaki Ar CPTX, Kaya Cure EPD, Kaya Cure ITX, Kaya Cure QTX, Kaya Cure BTC, Kaya Cure MCA, etc .; “Esacure (KIP100F, KB1, EB3, BP, X33, KTO46, KT37) manufactured by Sartomer , KIP150, TZT) ", etc., and combinations thereof are preferred examples.

  It is preferable to use a photoinitiator in the range of 0.1-15 mass% with respect to the total solid of a polymeric composition, More preferably, it is the range of 1-10 mass%.

  In addition to the photopolymerization initiator, a photosensitizer may be used. Specific examples of the photosensitizer include n-butylamine, triethylamine, tri-n-butylphosphine, Michler's ketone and thioxanthone. Further, one or more auxiliary agents such as an azide compound, a thiourea compound, and a mercapto compound may be used in combination.

  Examples of commercially available photosensitizers include “Kaya Cure (DMBI, EPA)” manufactured by Nippon Kayaku Co., Ltd.

(C) Organic solvent The polymerizable composition of the present invention contains an organic solvent (C).
Although it does not specifically limit as a solvent which melt | dissolves the composition containing each said component for forming a polymeric composition, An alcohol solvent and a ketone solvent are used preferably. Specifically, acetone, methyl ethyl ketone, 2-pentanone, 3-pentanone, 2-hexane, 2-heptanone, 4-heptanone, methyl isopropyl ketone, ethyl isopropyl ketone, diisopropyl ketone, methyl isobutyl ketone, methyl-t-butyl ketone, Examples thereof include diacetyl, acetylacetone, acetonylacetone, diacetone alcohol, mesityl oxide, chloroacetone, cyclopentanone, cyclohexanone, acetophenone, and the like. Among these, methyl ethyl ketone and methyl isobutyl ketone are preferable. These solvents may be used alone or in a mixture at an arbitrary mixing ratio.

  As the auxiliary solvent, an ester solvent such as propylene glycol monomethyl ether acetate or a fluorinated solvent (such as a fluorinated alcohol) can be appropriately used. These solvents may be used alone or in a mixture at an arbitrary mixing ratio.

Hereinafter, the antireflection film of the present invention will be described.
The antireflection film of the present invention is an antireflection film having at least one low refractive index layer on a transparent support, wherein the low refractive index layer contains the polymerizable composition. Formed from things.
(Production method of antireflection film)
The antireflection film of the present invention can be formed by the following method, but is not limited to this method. First, a composition for a low refractive index layer is prepared. Next, the composition is applied onto a transparent support by dip coating, air knife coating, curtain coating, roller coating, wire bar coating, gravure coating, die coating, or the like, and heated and dried. A micro gravure coating method, a wire bar coating method, and a die coating method (see US Pat. No. 2,681,294 and JP-A-2006-122889) are more preferable, and a die coating method is particularly preferable.

After coating, the layer formed from the composition for low refractive index layer containing the polymerizable composition is cured by light irradiation or heating. Thereby, a low refractive index layer is formed. If necessary, other layers (layers constituting the film described below, for example, a hard coat layer, an antiglare layer, a medium refractive index layer, a high refractive index layer, etc.) are coated on the transparent support in advance. In addition, a low refractive index layer can be formed thereon. In this way, the antireflection film of the present invention is obtained.
The coating method similar to the above can also be applied to the coating of the layers constituting the film described below (for example, hard coat layer, antiglare layer, medium refractive index layer, high refractive index layer, etc.). .

(Layer structure of antireflection film)
The antireflection film of the present invention can be produced by providing a low refractive index layer and a functional layer required according to the purpose singly or in layers on a transparent support.
As a preferred embodiment, an antireflection film laminated on the transparent support in consideration of the refractive index, the film thickness, the number of layers, the layer order and the like so that the reflectance is reduced by optical interference can be mentioned. . In the simplest configuration, the antireflection film has a configuration in which only a low refractive index layer is coated on a transparent support. In order to further reduce the reflectance, the antireflection layer is preferably composed of a high refractive index layer having a higher refractive index than the transparent support and a low refractive index layer having a lower refractive index than the transparent support. . Examples of the configuration include two layers of a high refractive index layer / low refractive index layer from the transparent support side, and three layers having different refractive indices, a medium refractive index layer (having a higher refractive index than the transparent support and a high refractive index. In which the refractive index layer is lower than that of the refractive index layer) / high refractive index layer / low refractive index layer, and the like, and more antireflection layers are also proposed. Among them, in view of durability, optical characteristics, cost, productivity, etc., it is preferable to have a medium refractive index layer / high refractive index layer / low refractive index layer in this order on a transparent support having a hard coat layer. Examples include the configurations described in Kaihei 8-122504, JP-A-8-110401, JP-A-10-300902, JP-A 2002-243906, JP-A 2000-117066, and the like. Other functions may be imparted to each layer, for example, an antifouling low refractive index layer or an antistatic high refractive index layer (eg, JP-A-10-206603, JP-A-2002). -243906 publication etc.) etc. are mentioned.

In the antireflection film of the present invention, a medium refractive index layer, a high refractive index layer, and a low refractive index layer are laminated in this order from the transparent support side on the transparent support,
The refractive index at a wavelength of 550 nm of the medium refractive index layer is 1.60 to 1.65, and the thickness of the medium refractive index layer is 50.0 nm to 70.0 nm.
The refractive index at a wavelength of 550 nm of the high refractive index layer is 1.70 to 1.74, and the thickness of the high refractive index layer is 90.0 nm to 115.0 nm.
The refractive index of the low refractive index layer at a wavelength of 550 nm is preferably 1.33 to 1.38, and the thickness of the low refractive index layer is preferably 85.0 nm to 95.0 nm.

Among the above-described configurations, the antireflection film of the present invention is particularly preferably the following configuration (1) or configuration (2).
Configuration (1):
The refractive index at a wavelength of 550 nm of the middle refractive index layer is 1.60 to 1.64, the thickness of the middle refractive index layer is 55.0 nm to 65.0 nm,
The refractive index of the high refractive index layer at a wavelength of 550 nm is 1.70 to 1.74, the thickness of the high refractive index layer is 105.0 nm to 115.0 nm,
An antireflection film which is a low refractive index layer having a refractive index of 1.33 to 1.38 at a wavelength of 550 nm of the low refractive index layer and a thickness of the low refractive index layer of 85.0 nm to 95.0 nm.
Configuration (2):
The refractive index at a wavelength of 550 nm of the middle refractive index layer is 1.60 to 1.65, and the thickness of the middle refractive index layer is 55.0 nm to 65.0 nm.
The refractive index of the high refractive index layer at a wavelength of 550 nm is 1.70 to 1.74, the thickness of the high refractive index layer is 90.0 nm to 100.0 nm,
The antireflective film whose refractive index in wavelength 550nm of a low refractive index layer is 1.33-1.38, and whose thickness of a low refractive index layer is 85.0-95.0 nm.

  By making the refractive index and thickness of each layer within the above ranges, the variation in reflected color can be further reduced. The configuration (1) is a configuration that can particularly reduce the reflectance while suppressing the fluctuation of the reflected color, and is particularly preferable. In addition, the configuration (2) is particularly preferable because the variation in reflectance is further suppressed to be smaller than that in the configuration (1), and the robustness against the variation in film thickness is excellent.

  In the present invention, for the design wavelength λ (= 550 nm: representative of the wavelength region having the highest visibility), the medium refractive index layer is represented by the following formula (I), and the high refractive index layer is represented by the following formula ( II), the low refractive index layer preferably satisfies the following formula (III).

Formula (I) λ / 4 × 0.68 <n ¹ d ¹ <λ / 4 × 0.74
Formula (II) λ / 2 × 0.66 <n ² d ² <λ / 2 × 0.72
Formula (III) λ / 4 × 0.84 <n ³ d ³ <λ / 4 × 0.92

(Where n ¹ is the refractive index of the medium refractive index layer, d ¹ is the layer thickness (nm) of the medium refractive index layer, n ² is the refractive index of the high refractive index layer, and d ² Is the layer thickness (nm) of the high refractive index layer, n ³ is the refractive index of the low refractive index layer, d ³ is the layer thickness (nm) of the low refractive index layer, and n ³ <n ¹ <n ² )

  When the above formula (I), formula (II), and formula (III) are satisfied, it is preferable because the reflectance becomes low and the change in reflected color can be suppressed. In addition, this is preferable because the change in color is small when an oil or fat component such as fingerprints or sebum adheres, so that dirt is hardly visible.

By using the low refractive index layer containing the compound (A) represented by the general formula (I) and the fluorine-containing polyfunctional acrylate in the present invention in combination with the above layer structure, a multilayer interference film structure can be obtained. Oils and fats such as magic, fingerprints, and sebum are less likely to adhere, and even if attached, they can be easily wiped off and made inconspicuous.
In the present invention, the average reflectance is preferably less than 1.20% and more preferably less than 1.16% from the viewpoint of visibility.
Further, when it is installed on the surface of the image display device, it is preferable that the average value of the average reflectance (specular reflectance) is 0.5% or less, so that the reflection can be remarkably reduced.

The specular reflectance and color are measured by attaching an adapter “ARV-474” to a spectrophotometer “V-550” (manufactured by JASCO Corporation), and in the wavelength region of 380 to 780 nm, the incident angle θ ( Antireflection properties can be evaluated by measuring the specular reflectivity at an output angle −θ at θ = 5 to 45 ° and 5 ° intervals, and calculating an average reflectivity of 450 to 650 nm. Furthermore, from the measured reflectance spectra, ^{L *} value of the CIE1976L ^* a ^* b ^* color space representing the color of specular reflection light with respect to incident light of each angle of incidence of the CIE standard illuminant D65, ^{a *} value, and ^{b *} value It is possible to calculate and evaluate the color of the reflected light.

The refractive index of each layer can be measured with a multi-wavelength Abbe refractometer DR-M2 (manufactured by Atago Co., Ltd.) by applying the coating solution of each layer to a glass plate so as to have a thickness of 3 to 5 μm. . In this specification, the refractive index measured using the filter of “DR-M2, M4 interference filter 546 (e) nm part number: RE-3523” can be adopted as the refractive index at a wavelength of 550 nm.
The film thickness of each layer can be measured by cross-sectional observation using a reflection spectral film thickness meter “FE-3000” (manufactured by Otsuka Electronics Co., Ltd.) utilizing light interference or a TEM (transmission electron microscope). Although the reflection spectral film thickness meter can also measure the refractive index simultaneously with the film thickness, it is desirable to use the refractive index of each layer measured by another means in order to increase the measurement accuracy of the film thickness. When the refractive index of each layer cannot be measured, the film thickness measurement by TEM is desirable. In that case, it is desirable to measure 10 or more locations and use an average value.

  The antireflection film of the present invention preferably has a form in which the film is rolled up in the form during production. In that case, in order to obtain the neutrality of the color of the reflected color, the average value d (average value), minimum value d (minimum value), and maximum value d (maximum value) of the layer thickness in an arbitrary 1000 m long range The value of the layer thickness distribution calculated by the following formula (6) using the value) as a parameter is preferably 5% or less for each layer of the thin film layer, more preferably 4% or less, and even more preferably 3% or less. More preferably, it is particularly preferably 2.5% or less and 2% or less.

  Formula (6): (maximum value d−minimum value d) × 100 / average value d

Next, the transparent support and each layer constituting the antireflection film of the present invention will be described in detail.
[Transparent support]
As the transparent support of the antireflection film of the present invention, a transparent substrate film is preferable. There is no limitation in particular as a transparent base film, such as a transparent resin film, a transparent resin board, a transparent resin sheet, and transparent glass. Transparent resin films include cellulose acylate films (for example, cellulose triacetate film (refractive index 1.48), cellulose diacetate film, cellulose acetate butyrate film, cellulose acetate propionate film), polyethylene terephthalate film, polyethersulfone. Film, polyacrylic resin film, polyurethane resin film, polyester film, polycarbonate film, polysulfone film, polyether film, polymethylpentene film, polyetherketone film, (meth) acrylonitrile film polyolefin, alicyclic structure Polymer (Norbornene resin (Arton: trade name, manufactured by JSR Corporation, amorphous polyolefin (ZEONEX: Name, Nippon Zeon Co., Ltd.)), and the like. Among these, triacetyl cellulose, polyethylene terephthalate, is preferably a polymer having an alicyclic structure, particularly triacetyl cellulose.
Although the thickness of a transparent support body can use the thing of about 25 micrometers-1000 micrometers normally, Preferably it is 25 micrometers-250 micrometers, and it is more preferable that it is 30 micrometers-90 micrometers.
Although the arbitrary width | variety of a transparent support body can be used, the thing of 100-5000 mm is normally used from the point of handling, a yield, and productivity, and it is preferable that it is 800-3000 mm, 1000-2000 mm More preferably it is. The transparent support can be handled in the form of a roll, and is usually 100 m to 5000 m, preferably 500 m to 3000 m.
The surface of the transparent support is preferably smooth, and the average roughness Ra is preferably 1 μm or less, preferably 0.0001 to 0.5 μm, and 0.001 to 0.1 μm. More preferably.
The transparent support is described in paragraphs [0163] to [0169] of JP-A-2009-98658, and the same applies to the present invention.

[Hard coat layer]
The antireflection film of the present invention can be provided with a hard coat layer in order to impart the physical strength of the film. In the present invention, it is not necessary to provide a hard coat layer, but it is preferable to provide a hard coat layer because the scratch resistance surface such as a pencil scratch test becomes strong.
Preferably, a low refractive index layer is provided on the hard coat layer, and more preferably an intermediate refractive index layer and a high refractive index layer are provided between the hard coat layer and the low refractive index layer to constitute an antireflection film.
The hard coat layer may be composed of two or more layers.

  The refractive index of the hard coat layer in the present invention is preferably in the range of 1.48 to 2.00, more preferably 1.48 to 1, from the optical design for obtaining an antireflection film. .60. In the present invention, since there is at least one low refractive index layer on the hard coat layer, when the refractive index is less than 1.48, the antireflection property is lowered, and when it is larger than 2.00, the color of reflected light is strong. Tend to be.

The film thickness of the hard coat layer is usually about 0.5 μm to 50 μm, preferably 1 μm to 20 μm, more preferably 5 μm to 20 μm, from the viewpoint of imparting sufficient durability and impact resistance to the film.
Alternatively, the strength of the hard coat layer is preferably H or higher, more preferably 2H or higher, and most preferably 3H or higher in the pencil hardness test. Furthermore, in the Taber test according to JIS K5400, the smaller the wear amount of the test piece before and after the test, the better.

The hard coat layer is preferably formed by a crosslinking reaction or a polymerization reaction of an ionizing radiation curable compound. For example, it is formed by applying a polymerizable composition containing an ionizing radiation-curable polyfunctional monomer or polyfunctional oligomer on a transparent support and subjecting the polyfunctional monomer or polyfunctional oligomer to a crosslinking reaction or a polymerization reaction. Can do.
The functional group of the ionizing radiation curable polyfunctional monomer or polyfunctional oligomer is preferably a light, electron beam, or radiation polymerizable group, and among them, a photopolymerizable functional group is preferable.
Examples of the photopolymerizable functional group include unsaturated polymerizable functional groups such as a (meth) acryloyl group, a vinyl group, a styryl group, and an allyl group. Among them, a (meth) acryloyl group is preferable. Specifically, the compounds mentioned as the polyfunctional monomer having the following polymerizable unsaturated group can be preferably used.
(Polyfunctional monomer having a polymerizable unsaturated group)
The polyfunctional monomer having a polymerizable unsaturated group is preferably a polyfunctional monomer having three or more polymerizable unsaturated groups. The polyfunctional monomer having a polymerizable unsaturated group can function as a curing agent. By using in combination with a fluorine-containing copolymer having a polymerizable unsaturated group, which will be described later, it is possible to improve scratch resistance or scratch resistance after chemical treatment.
The polyfunctional monomer having a polymerizable unsaturated group may contain no fluorine or may contain fluorine.

  The non-fluorinated polyfunctional monomer used in the present invention will be described. Examples of the monomer include compounds having a polymerizable functional group such as a (meth) acryloyl group, a vinyl group, a styryl group, and an allyl group, and among them, a (meth) acryloyl group is preferable. Particularly preferably, a compound containing three or more (meth) acryloyl groups in one molecule described below can be used.

  Specific examples of the compound having a polymerizable unsaturated bond include (meth) acrylic acid diesters of alkylene glycol, (meth) acrylic acid diesters of polyoxyalkylene glycol, and (meth) acrylic acid diesters of polyhydric alcohol. , (Meth) acrylic acid diesters of ethylene oxide or propylene oxide adducts, epoxy (meth) acrylates, urethane (meth) acrylates, polyester (meth) acrylates, and the like.

Among these, esters of polyhydric alcohol and (meth) acrylic acid are preferable. For example, pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, EO modified trimethylolpropane tri (meth) acrylate, PO modified trimethylolpropane tri (meth) acrylate, EO Modified tri (meth) acrylate phosphate, trimethylolethane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa ( (Meth) acrylate, pentaerythritol hexa (meth) acrylate, 1,2,3-cyclohexanetetramethacrylate, polyurethane polyol Rate, polyester polyacrylate and caprolactone-modified tris (acryloyloxyethyl) isocyanurate.

Commercially available polyfunctional acrylate compounds having a (meth) acryloyl group (esters of polyhydric alcohol and (meth) acrylic acid) can also be used, such as KAYARAD DPHA manufactured by Nippon Kayaku Co., Ltd. The PET-30 etc. can be mentioned.
Non-fluorinated polyfunctional monomers are described in paragraphs [0114] to [0122] of JP-A-2009-98658, and the same applies to the present invention.

  The hard coat layer contains matte particles having an average particle diameter of 1.0 to 10.0 μm, preferably 1.5 to 7.0 μm, such as inorganic compound particles or resin particles, for the purpose of imparting internal scattering properties. May be.

  For the purpose of controlling the refractive index of the hard coat layer, various refractive index monomers or inorganic particles, or both can be added to the binder of the hard coat layer. In addition to the effect of controlling the refractive index, the inorganic particles also have the effect of suppressing cure shrinkage due to the crosslinking reaction. In the present invention, a polymer formed by polymerizing the polyfunctional monomer and / or the high refractive index monomer after the formation of the hard coat layer, and the inorganic particles dispersed therein are referred to as a binder. Silica fine particles are preferably used as the inorganic fine particles for controlling the refractive index. By using the silica fine particles, it is possible to suppress uneven color due to interference between the support and the hard coat layer.

(Conductive compound)
The hard coat layer in the present invention may contain a conductive compound for the purpose of imparting antistatic properties. The conductive compound used in the present invention is not particularly limited, and examples thereof include an ion conductive compound and an electron conductive compound. Examples of the ion conductive compound include cationic, anionic, nonionic, and amphoteric ion conductive compounds. Examples of the electron conductive compound include an electron conductive compound which is a non-conjugated polymer or a conjugated polymer in which aromatic carbocycles or aromatic heterocycles are connected by a single bond or a divalent or higher linking group. Among these, a compound having a quaternary ammonium base (cationic compound) is suitable from the viewpoint of high antistatic performance, relatively low cost, and uneven distribution in the substrate side region.

  As the compound having a quaternary ammonium base, either a low molecular type or a high molecular type can be used, but a high molecular cationic antistatic agent is more preferable because there is no variation in antistatic properties due to bleedout or the like. Used. As the cationic compound having a polymer type quaternary ammonium base, it can be appropriately selected from known compounds, and the compounds described in JP 2010-084425 A, JP 400605 A and the like are preferably used. it can.

(Anti-glare layer)
The antiglare layer is formed for the purpose of contributing to the film an antiglare property due to surface scattering and preferably a hard coat property for improving the hardness and scratch resistance of the film.
The antiglare layer is described in paragraphs [0178] to [0189] of JP-A-2009-98658, and the same applies to the present invention.

[High refractive index layer and medium refractive index layer]
As described above, the refractive index of the high refractive index layer is preferably 1.70 to 1.74, more preferably 1.71 to 1.73. The refractive index of the middle refractive index layer is adjusted to be a value between the refractive index of the low refractive index layer and the refractive index of the high refractive index layer. The refractive index of the medium refractive index layer is preferably 1.60 to 1.64, and more preferably 1.61 to 1.63.
The high refractive index layer and the medium refractive index layer are formed by chemical vapor deposition (CVD) or physical vapor deposition (PVD), particularly by vacuum vapor deposition or sputtering, which is a kind of physical vapor deposition, to form a transparent thin film of inorganic oxide. Although it can be used, an all wet coating method is preferred.
The oxygen concentration is preferably formed by a crosslinking reaction or polymerization reaction of a curable resin in an atmosphere of 6% by volume or less, more preferably 4% by volume or less, particularly preferably 2% by volume of oxygen. Hereinafter, it is most preferably 1% by volume or less.

  In addition, when controlling the refractive index of the high refractive index layer, it is preferable to use inorganic fine particles. However, titanium dioxide particles have problems such as deterioration of light resistance due to photocatalytic action, and thus suitability for production, durability, etc. It may become a problem in terms of. By setting the refractive index of the high refractive index layer within the above range, inorganic fine particles having a refractive index lower than that of the titanium dioxide particles, for example, zirconium oxide particles can be used, which is excellent in terms of manufacturing suitability and durability. Yes.

As described above, the medium refractive index layer can be obtained in the same manner by using the same material as that of the high refractive index layer.
Specifically, the type of fine particles and the type of resin are selected so that the medium refractive index layer and the high refractive index layer satisfy the film thickness and refractive index of the above formulas (I) and (II), and the blending ratio thereof. An example is to determine the main composition.

  In the composition for forming all the layers, the same solvent as the composition for the low refractive index layer can be used.

[Low refractive index layer]
The low refractive index layer in the present invention preferably has a refractive index of 1.30 to 1.47. In the case of a multilayer thin film interference type antireflection film (medium refractive index layer / high refractive index layer / low refractive index layer), the refractive index of the low refractive index layer is preferably from 1.33 to 1.38, more preferably. Is 1.35 to 1.37. Within the above range, the reflectance can be suppressed and the film strength can be maintained, which is preferable. The low refractive index layer can be formed by a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method, particularly a vacuum vapor deposition method or a sputtering method, which is a kind of physical vapor deposition method. It is preferable to use an all wet coating method using the composition for a low refractive index layer.

The haze of the low refractive index layer is preferably 3% or less, more preferably 2% or less, and most preferably 1% or less.
The strength of the antireflection film formed up to the low refractive index layer is preferably H or more, more preferably 2H or more, and most preferably 3H or more in a pencil hardness test under a 500 g load.
In order to improve the antifouling performance of the antireflection film, it is preferable that the contact angle of the surface with water is 95 ° or more. More preferably, it is 102 ° or more. In particular, a contact angle of 105 ° or more is particularly preferable because the antifouling performance against fingerprints is remarkably improved. Further, the surface free energy is more preferably 25 mN / m or less, particularly preferably 23 mN / m or less, and further preferably 20 mN / m or less. Most preferably, the surface free energy is 20 mN / m or less.

(Formation of a low refractive index layer)
The low refractive index layer dissolves or disperses the compound (A) represented by the general formula (I), the fluorine-containing copolymer having a polymerizable unsaturated group, inorganic fine particles, and other optional components contained as desired. Cured by ionizing radiation irradiation (for example, light irradiation, electron beam irradiation, etc.) and heating, or by a polymerization reaction at the same time as coating, or after coating and drying. It is preferable to form.
In particular, when the low refractive index layer is formed by a crosslinking reaction or a polymerization reaction of an ionizing radiation curable compound, the crosslinking reaction or the polymerization reaction is preferably performed in an atmosphere having an oxygen concentration of 1% by volume or less. . By forming in an atmosphere having an oxygen concentration of 1% by volume or less, an outermost layer excellent in physical strength and chemical resistance can be obtained.
The oxygen concentration is preferably 0.5% by volume or less, more preferably the oxygen concentration is 0.1% by volume or less, particularly preferably the oxygen concentration is 0.05% by volume or less, and most preferably 0.02% by volume or less. is there.

The fluorine-containing copolymer having a polymerizable unsaturated group forms a low refractive index layer film and can function as a binder.
The fluorine-containing copolymer having a polymerizable unsaturated group is preferably obtained by polymerizing at least one fluorine-containing vinyl monomer.
Examples of the fluorine-containing vinyl monomer include fluoroolefins (for example, fluoroethylene, vinylidene fluoride, tetrafluoroethylene, hexafluoropropylene, etc.), (meth) acrylic acid partial or fully fluorinated alkyl ester derivatives (for example, biscoat 6FM (trade name) , Osaka Organic Chemical Co., Ltd.) and R-2020 (trade name, manufactured by Daikin Co., Ltd.), fully or partially fluorinated vinyl ethers, and the like, preferably perfluoroolefins, refractive index, solubility, and transparency. From the viewpoint of availability, hexafluoropropylene is particularly preferable. Increasing the composition ratio of these fluorinated vinyl monomers can lower the refractive index but lowers the film strength. In the present invention, the fluorine-containing vinyl monomer is preferably introduced so that the fluorine content of the copolymer is 20 to 60% by mass, more preferably 25 to 55% by mass, and particularly preferably 30 to 50%. This is a case of mass%.

  The inorganic fine particles used in the low refractive index layer are not particularly limited, but the average particle size is preferably 5 to 120 nm, and inorganic low refractive index particles are preferable from the viewpoint of lowering the refractive index.

Inorganic fine particles include fine particles of magnesium fluoride and silica from the viewpoint of low refractive index.
As the inorganic fine particles, porous or hollow fine particles may be mentioned as a preferred embodiment.
[Preparation method of porous or hollow fine particles]
A preferred method for producing hollow fine particles is described below. The first step is the formation of core particles that can be removed by post-treatment, the second step is the formation of a shell layer, the third step is the dissolution of core particles, and the fourth step is the formation of an additional shell phase if necessary. Specifically, the hollow particles can be produced according to the method for producing hollow silica fine particles described in, for example, JP-A-2001-233611.

  Among the configurations of the antireflection film of the present invention, the following configuration (3) or (4) of the antireflection film is particularly effective when the reflection color is uniform and neutral with low reflectance and when fingerprints or sebum adheres. It is preferable because it can be easily wiped off, exhibits excellent antifouling properties that are not easily noticeable, and has excellent scratch resistance.

Configuration (3)
Transparent support: tricellulose acetate film (refractive index: 1.49, film thickness 60 μm)
Hard coat layer: polyfunctional monomer having a polymerizable unsaturated group, silica sol, photopolymerization initiator (refractive index 1.49, film thickness 10 μm)
Middle refractive index layer: polyfunctional monomer having a polymerizable unsaturated group, zirconium oxide fine particles, photopolymerization initiator (refractive index: 1.62, film thickness 60 nm)
High refractive index layer: polyfunctional monomer having a polymerizable unsaturated group, zirconium oxide fine particles, photopolymerization initiator (refractive index: 1.72, film thickness 110 nm)
Low refractive index layer: fluorine-containing copolymer having a polymerizable unsaturated group, hollow silica fine particles, polyfunctional monomer having a polymerizable unsaturated group (a compound containing fluorine and a compound not containing fluorine), the above general formula ( Compound (A) represented by I), photopolymerization initiator (refractive index: 1.36, film thickness 90 nm)
Configuration (4)
Transparent support: tricellulose acetate film (refractive index: 1.49, film thickness 60 μm)
Hard coat layer: polyfunctional monomer having a polymerizable unsaturated group, silica sol, photopolymerization initiator (refractive index 1.49, film thickness 10 μm)
Medium refractive index layer: polyfunctional monomer having polymerizable unsaturated group, phosphorus-containing tin oxide fine particles or antimony-doped tin oxide fine particles, photopolymerization initiator (refractive index: 1.635, film thickness 60 nm)
High refractive index layer: polyfunctional monomer having a polymerizable unsaturated group, zirconium oxide fine particles, photopolymerization initiator (refractive index: 1.72, film thickness: 95 nm)
Low refractive index layer: fluorine-containing copolymer having a polymerizable unsaturated group, hollow silica fine particles, polyfunctional monomer having a polymerizable unsaturated group (a compound containing fluorine and a compound not containing fluorine), the above general formula ( Compound (A) represented by I), photopolymerization initiator (refractive index: 1.36, film thickness 90 nm)

[Protective film for polarizing plate]
When using the antireflection film of the present invention as a polarizing film surface protective film (polarizing plate protective film), the surface of the transparent support opposite to the side having the thin film layer, that is, the surface to be bonded to the polarizing film By making it hydrophilic, it is possible to improve adhesion to a polarizing film containing polyvinyl alcohol as a main component.
Of the two protective films of the polarizer, the film other than the antireflection film is preferably an optical compensation film having an optical compensation layer comprising an optically anisotropic layer. The optical compensation film (retardation film) can improve the viewing angle characteristics of the liquid crystal display screen.
A known film can be used as the optical compensation film, but the optical compensation film described in JP-A-2001-100042 is preferable in terms of widening the viewing angle.

  When the antireflection film is used as a surface protective film for a polarizing film (protective film for polarizing plate), it is particularly preferable to use a triacetyl cellulose film as the transparent support.

  As a method for producing a protective film for a polarizing plate in the present invention, (1) a method of coating each layer constituting the above antireflection film on one surface of a previously saponified transparent support, and (2) a transparent support After coating an antireflection layer on one side of the body, a method of saponifying the side or both sides to be bonded to the polarizing film, (3) coating a part of the antireflection layer on one side of the transparent support Thereafter, there are three methods of applying the remaining layer after saponifying the side or both sides to be bonded to the polarizing film, (1) is hydrophilicized to the surface on which the antireflection layer is to be applied, Since it becomes difficult to ensure the adhesion between the transparent support and the antireflection layer, the method (2) is particularly preferable.

[Polarizer]
Next, the polarizing plate of the present invention will be described. The polarizing plate of the present invention is a polarizing plate having a polarizing film and two protective films for protecting both surfaces of the polarizing film, and at least one of the protective films is the antireflection film of the present invention.

  The transparent support of the antireflection film is preferably bonded to the polarizing film via an adhesive layer made of polyvinyl alcohol, if necessary, and has a protective film on the other side of the polarizing film. The surface of the other protective film opposite to the polarizing film may have an adhesive layer.

  By using the antireflection film of the present invention as a protective film for a polarizing plate, a polarizing plate having an antireflection function excellent in physical strength and light resistance can be produced, and the cost can be greatly reduced and the display device can be thinned. .

  Moreover, the polarizing plate of the present invention can also have an optical compensation function. In that case, only one surface side of the surface and the back surface of the two surface protective films is formed using the antireflection film, and the side having the antireflection film of the polarizing plate is the surface on the other surface side. It is preferable that the protective film is an optical compensation film.

  By producing a polarizing plate using the antireflection film of the present invention as one of the protective films for polarizing plates and an optical compensation film having optical anisotropy as the other protective film of the polarizing film, a liquid crystal display device is further produced. The contrast in the bright room and the viewing angle of the top, bottom, left and right can be improved.

  The image display device of the present invention is characterized by having the antireflection film or polarizing plate of the present invention on the outermost surface of the display.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the scope of the present invention should not be construed as being limited thereto.

<Synthesis Example 1: Synthesis of Compound (A) Represented by General Formula (I)>
Synthesis of Compound (A-1) The compound (A-1) was produced according to the following synthesis scheme.

(Process 1)
60 g of polyethylene glycol (PEG 600) obtained by ring-opening polymerization of an epoxy ring based on “alkylene oxide polymer” (Kaibundo: Mitsuta Shibata, Masahiro Saito, Shinichi Akimoto), 400 ml of ethyl acetate, 240 ml of pyridine, While stirring at 0 ° C., 80.2 g of 7H-dodecafluoroheptanoic acid chloride was added, and the mixture was returned to room temperature (25 ° C.) and stirred as it was for 4 hours. The reaction mixture was diluted with 150 mL of ethyl acetate and 350 mL of hexane, and washed with 1N hydrochloric acid, water, aqueous sodium hydrogen carbonate, and saturated brine. This was dried over magnesium sulfate and concentrated to obtain compound (1). Yield 118.9 g, yield 66.0%.
(Process 2)
In a fluororesin reaction vessel, 300 mL of a fluorinated solvent (Fluorinert FC-72, 3M) and 45 g of sodium fluoride were taken and placed in a 0 ° C. bath under a helium atmosphere. A sodium fluoride pellet packed bed and a cooler maintained at −40 ° C. were installed in series at the outlet of the reaction vessel. Helium gas was blown at a rate of 250 mL / min for 1 hour, and then fluorine gas diluted to 20% with nitrogen gas (hereinafter simply referred to as diluted fluorine gas) was blown at a rate of 250 mL / min for 10 minutes. Subsequently, while diluting fluorine gas at a rate of 250 mL / min, 6.0 g of the compound (1), 36 g of a fluorine-containing solvent AK-225 (Asahi Krine, manufactured by Asahi Glass Co., Ltd.), and 0.15 g of hexafluorobenzene are added in a solution of 5. Added at a rate of 2 mL / hour. After completion of the addition, diluted fluorine gas was blown at a rate of 250 mL / min for 15 minutes. Then, 10 mL of hexafluorobenzene was added at a rate of 10 mL / hour while diluting fluorine gas was blown at a rate of 250 mL / min. After completion of the addition, diluted fluorine gas was blown at a rate of 250 mL / min for 15 minutes, and further helium gas was blown at a rate of 250 mL / min for 1 hour to drive out residual fluorine gas in the reaction vessel. GC and GC-MS analysis confirmed that the perfluorination had progressed completely.
After filtering the solid matter from the reaction solution, it was transferred to a glass reaction vessel, 122 g of sodium fluoride was added, and 300 mL of methanol was added dropwise while stirring at room temperature. After stirring for 2.5 hours, the solid was filtered off and concentrated at normal pressure. Purification was performed by distillation under reduced pressure to obtain compound (2). Yield 4.16 g, yield 50.2%.
(Process 3)
3 g of compound (2) (methyl ester) and 10 mL of nonafluorobutyl methyl ether were taken, and while stirring at 0 ° C., 0.1 g of sodium tetrahydroborate was added, and the mixture was returned to room temperature and stirred for 2 hours. The reaction solution was washed with 6N hydrochloric acid, water, aqueous sodium bicarbonate, and saturated brine. This was dried over magnesium sulfate and concentrated to obtain compound (3). Yield 2.4 g, yield 80.0%.
(Process 4)
2.8 g of compound (3) (alcohol), 4 mL of nonafluorobutyl methyl ether, 0.8 g of Karenz BEI (manufactured by Showa Denko KK), 0.2 mg of 4-methoxyphenol, dibutyltin dilaurate (IV) 0 mg was taken and stirred at 70 ° C. for 4 hours. After completion of the reaction, 3.5 mL of nonafluorobutyl methyl ether was added to the reaction solution to obtain a 20% by mass solution of the target compound (A-1).
Compound (A-16), Compound (A-7), Compound (A-13), Compound (A-26), and Compound (A-28) were obtained in the same manner as in the synthesis of Compound (A-1). .

Hereinafter, Example 3 shall be read as Reference Example 3.
[Examples 1-6 and Comparative Examples 1-3]
[Preparation of antireflection film]
As shown below, a coating solution for forming each layer was prepared, and each layer was formed to prepare the antireflection films of Examples 1 to 6 and Comparative Examples 1 to 3.

(Preparation of coating liquid A for hard coat layer)
The following composition was put into a mixing tank and stirred to obtain a hard coat layer coating solution.
To 900 parts by mass of methyl ethyl ketone, 100 parts by mass of cyclohexanone, 750 parts by mass of partially caprolactone-modified polyfunctional acrylate (DPCA-20, manufactured by Nippon Kayaku Co., Ltd.), silica sol (MIBK-ST, manufactured by Nissan Chemical Industries, Ltd.) ) 200 parts by mass and 50 parts by mass of a photopolymerization initiator (Irgacure 184, manufactured by Ciba Specialty Chemicals) were added and stirred. A coating solution A for a hard coat layer was prepared by filtering through a polypropylene filter having a pore size of 0.4 μm.

(Preparation of coating liquid A for medium refractive index layer)
Hard coating agent containing ZrO ₂ fine particles (Desolite Z7404 [refractive index 1.72, solid content concentration: 60% by mass, zirconium oxide fine particle content: 70% by mass (based on solid content), average particle size of zirconium oxide fine particles: about 20 nm, Solvent composition: methyl isobutyl ketone / methyl ethyl ketone = 9/1, manufactured by JSR Corporation]) 5.1 parts by mass, mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (DPHA) 1.5 parts by mass, light A polymerization initiator (Irgacure 907, manufactured by Ciba Specialty Chemicals Co., Ltd.) 0.05 parts by mass, methyl ethyl ketone 66.6 parts by mass, methyl isobutyl ketone 7.7 parts by mass and cyclohexanone 19.1 parts by mass were added and stirred. did. After sufficiently stirring, the solution was filtered through a polypropylene filter having a pore size of 0.4 μm to prepare a coating solution A for medium refractive index layer.

(Preparation of coating liquid B for medium refractive index layer)
A mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (DPHA) 4.5 parts by mass, a photopolymerization initiator (Irgacure 907, manufactured by Ciba Specialty Chemicals) 0.14 parts by mass, methyl ethyl ketone 66.5 Part by mass, 9.5 parts by mass of methyl isobutyl ketone and 19.0 parts by mass of cyclohexanone were added and stirred. After sufficiently stirring, the solution was filtered through a polypropylene filter having a pore size of 0.4 μm to prepare a coating solution B for medium refractive index layer.

  A medium refractive index coating solution C was prepared by mixing an appropriate amount of the medium refractive index coating solution A and the medium refractive index coating solution B so as to have the refractive index of each sample shown in Table 2 below.

(Preparation of coating liquid A for high refractive index layer)
ZrO ₂ fine particle-containing hard coating agent (Desolite Z7404 [refractive index 1.72, solid content concentration: 60% by mass, zirconium oxide fine particle content: 70% by mass (based on solid content), average particle size of zirconium oxide fine particles: about 20 nm, Solvent composition: methyl isobutyl ketone / methyl ethyl ketone = 9/1, manufactured by JSR Corporation]) 15.7 parts by mass, 61.9 parts by mass of methyl ethyl ketone, 3.4 parts by mass of methyl isobutyl ketone, 1.1 parts by mass of cyclohexanone Added and stirred. Filtration through a polypropylene filter having a pore diameter of 0.4 μm prepared a coating solution A for a high refractive index layer.

(Preparation of coating solution for low refractive index layer)
(Synthesis of perfluoroolefin copolymer (1))

In the above structural formula, 50:50 represents a molar ratio.
Into an autoclave with a stirrer made of stainless steel having an internal volume of 100 ml, 40 ml of ethyl acetate, 14.7 g of hydroxyethyl vinyl ether and 0.55 g of dilauroyl peroxide were charged, and the inside of the system was deaerated and replaced with nitrogen gas. Furthermore, 25 g of hexafluoropropylene (HFP) was introduced into the autoclave and the temperature was raised to 65 ° C. The pressure when the temperature in the autoclave reached 65 ° C. was 0.53 MPa (5.4 kg / cm ² ). The reaction was continued for 8 hours while maintaining the temperature, and when the pressure reached 0.31 MPa (3.2 kg / cm ² ), the heating was stopped and the mixture was allowed to cool. When the internal temperature dropped to room temperature, unreacted monomers were driven out, the autoclave was opened, and the reaction solution was taken out. The obtained reaction solution was poured into a large excess of hexane, and the polymer was precipitated by removing the solvent by decantation. Further, this polymer was dissolved in a small amount of ethyl acetate and reprecipitated twice from hexane to completely remove the residual monomer. After drying, 28 g of polymer was obtained. Next, 20 g of the polymer was dissolved in 100 ml of N, N-dimethylacetamide, and 11.4 g of acrylic acid chloride was added dropwise under ice cooling, followed by stirring at room temperature for 10 hours. Ethyl acetate was added to the reaction solution, washed with water, the organic layer was extracted and concentrated, and the resulting polymer was reprecipitated with hexane to obtain 19 g of perfluoroolefin copolymer (1). The obtained polymer had a refractive index of 1.422 and a mass average molecular weight of 50,000.

(Preparation of hollow silica particle dispersion A)
Hollow silica particle fine particle sol (isopropyl alcohol silica sol, CS60-IPA manufactured by Catalyst Chemical Industry Co., Ltd., average particle diameter 60 nm, shell thickness 10 nm, silica concentration 20% by mass, silica particle refractive index 1.31) in 500 parts by mass, After 30 parts by mass of acryloyloxypropyltrimethoxysilane and 1.51 parts by mass of diisopropoxyaluminum ethyl acetate were added and mixed, 9 parts by mass of ion-exchanged water was added. After making it react at 60 degreeC for 8 hours, it cooled to room temperature and added 1.8 mass parts of acetylacetone, and obtained the dispersion liquid. Then, while adding cyclohexanone so that the silica content was almost constant, solvent substitution was performed by distillation under reduced pressure at a pressure of 30 Torr, and finally a dispersion A having a solid content concentration of 18.2% by mass was obtained by adjusting the concentration. . The amount of IPA (isopropyl alcohol) remaining in the obtained dispersion A was analyzed by gas chromatography and found to be 0.5% by mass or less.

(Preparation of coating solution for low refractive index layer)
Each component was mixed as shown in Table 1 below, and dissolved in methyl ethyl ketone to prepare low refractive index layer coating solutions Ln1 to Ln9 having a solid content concentration of 5% by mass.

As antifouling agents, compounds (A-1), (A-7), (A-13), (A-16), (A-26), (A-28), (AC-1) to (AC) -3) was used. Compounds (A-1), (A-7), (A-13), (A-16), (A-26), and (A-28) are as described above.
The following (AC-1) is the compound 1 described in JP-A-2009-256597, and the following (AC-2) is the fluorine compound (3) described in Japanese Patent No. 4556151. -3) is compound B-5 described in JP-A-2009-29979.
Further, as described above, the compound 1 (AC-1) described in JP2009-256597A actually has the following structure (AC-1 ′).

Other compounds used are shown below.
P-1: Perfluoroolefin copolymer (1)
DPHA: Mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (manufactured by Nippon Kayaku Co., Ltd.)
-Dispersion A: Hollow silica particle dispersion A (hollow silica particle sol surface-modified with acryloyloxypropyltrimethoxysilane, solid concentration 18.2% by mass)
Irg127: Photopolymerization initiator Irgacure 127 (Ciba Specialty Chemicals Co., Ltd.)
M-1: the following fluorine-containing polyfunctional acrylate (fluorine content 44.9% by mass, tetrafunctional)

(Preparation of hard coat layer A)
The coating liquid A for hard coat layer was applied on a triacetyl cellulose film (TD60UL, manufactured by Fuji Film Co., Ltd., refractive index 1.48) as a transparent support having a layer thickness of 60 μm using a gravure coater. After drying at 100 ° C., an irradiance of 400 mW / cm using an air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.) of 160 W / cm while purging with nitrogen so that the oxygen concentration becomes 1.0 vol% or less. ² , the coating layer was cured by irradiating with an ultraviolet ray having an irradiation amount of 150 mJ / cm ² to form a hard coat layer A having a thickness of 10 μm.

  A medium refractive index layer coating solution, a high refractive index layer coating solution, and a low refractive index layer coating solution, which are adjusted to have a desired refractive index, are applied onto the hard coat layer A using a gravure coater. did. The refractive index of each layer was measured by applying a coating solution for each layer on a glass plate so as to have a thickness of about 4 μm, and measuring with a multiwavelength Abbe refractometer DR-M2 (manufactured by Atago Co., Ltd.). The refractive index measured using the “DR-M2, M4 interference filter 546 (e) nm part number: RE-3523” filter was employed as the refractive index at a wavelength of 550 nm.

  The film thickness of each layer was calculated using a reflection spectral film thickness meter “FE-3000” (manufactured by Otsuka Electronics Co., Ltd.) after laminating the medium refractive index layer, the high refractive index layer, and the low refractive index layer. The value derived from the Abbe refractometer was used as the refractive index of each layer in the calculation.

The medium refractive index layer was dried at 90 ° C. for 30 seconds, and the ultraviolet curing condition was 180 W / cm air-cooled metal halide lamp (eye graphics) while purging with nitrogen so that the atmosphere had an oxygen concentration of 1.0% by volume or less. The irradiance was 300 mW / cm ² and the irradiation amount was 240 mJ / cm ² .

The drying condition of the high refractive index layer is 90 ° C. for 30 seconds, and the ultraviolet curing condition is a 240 W / cm air-cooled metal halide lamp (eye graphics) while purging with nitrogen so that the atmosphere has an oxygen concentration of 1.0% by volume or less. The irradiance was 300 mW / cm ² and the irradiation amount was 240 mJ / cm ² .

(Preparation of low refractive index layer)
The low refractive index layer was dried at 90 ° C. for 30 seconds, and the ultraviolet curing condition was 240 W / cm air-cooled metal halide lamp (eye graphics) while purging with nitrogen so that the atmosphere had an oxygen concentration of 0.1% by volume or less. The irradiance was 600 mW / cm ² and the irradiation amount was 600 mJ / cm ² .

  Table 2 shows the coating solutions used in the production of the antireflection films of Examples 1 to 6 and Comparative Examples 1 to 3 produced by the above method, the refractive index and the layer thickness of each layer.

(Evaluation of antireflection film)
Various characteristics of the antireflection film were evaluated by the following methods. The results are shown in Table 3.

(1) Steel Wool Scratch Resistance (SW Resistance) Evaluation Using a rubbing tester, a rubbing test can be performed under the following conditions as an index of scratch resistance.
Evaluation environmental conditions: 25 ° C., 60% RH
Rubbing material: Steel wool (manufactured by Nippon Steel Wool Co., Ltd., Grade No. 0000)
Wrap around the tip (1cm x 1cm) of the scraper of the tester that comes into contact with the sample, and fix the band.
Travel distance (one way): 13cm
Rubbing speed: 13 cm / second,
Load: 500 g / cm ²
Tip contact area: 1 cm × 1 cm,
Number of rubs: 10 round trips.
An oily black ink was applied to the back side of the rubbed sample and visually observed with reflected light to evaluate scratches on the rubbed portion.
A: Even if you look very carefully, no scratches are visible.
B: Slightly weak scratches can be seen when viewed very carefully.
C: A weak wound is visible.
D: A moderate crack is visible.
E: There is a scratch that can be seen at first glance.

(2) Fingerprint wiping 1
After oily black ink was applied to the back side of the sample, a finger was pressed against the coated surface to attach a fingerprint. The attached fingerprint was wiped 10 times with tissue paper, and the remaining fingerprint was observed and evaluated.
A: The fingerprint marks are not completely visible.
B: Although the trace of fingerprints is slightly visible, I do not care.
C: The fingerprint adhesion mark is visible and anxious.
D: The trace of wiping off the fingerprint is clearly visible and anxious.
E: Fingerprint cannot be wiped off

(3) Fingerprint wiping property 2
After oily black ink was applied to the back side of the sample, a finger was pressed against the coated surface to attach a fingerprint. The attached fingerprint was wiped off with a tissue paper, and the number of times of wiping (reciprocation) until the remaining trace of the attached fingerprint was completely invisible was evaluated. Those that are completely invisible in a small number of times are preferred.

(4) Antifouling durability A film is fixed on a glass surface with an adhesive, and a diameter of 5 mm is used with a pen tip (thin) of a black magic “Mackey extra fine (product name: made by ZEBRA)” at 25 ° C. and 60 RH%. The round shape is written three times, and after 10 seconds, it is wiped back and forth twice with a load that is enough to dent the bundle of Bencot (Brand name, Asahi Kasei Co., Ltd.). The writing and wiping were repeated under the above conditions until the magic traces were not erased by wiping, and the antifouling property was evaluated by the number of times that the wiping was completed. The number of times until it no longer disappears is preferably 10 times or more, and more preferably 15 times or more.

(5) Average reflectivity A spectrophotometer V-550 (manufactured by JASCO Corporation) is equipped with an adapter ARV-474, and in the wavelength region of 380 to 780 nm, the specular reflection with an output angle of 5 ° at an incident angle of 5 °. The reflectance was measured, the average reflectance of 450 to 650 nm was calculated, and the antireflection property was evaluated.

(6) Relative surface free energy Using a contact angle meter [“CA-X” type contact angle meter, manufactured by Kyowa Interface Science Co., Ltd.], using pure water as a liquid in a dry state (20 ° C./65% RH) Then, a droplet having a diameter of 1.0 mm was formed on the needle tip, and this was brought into contact with the surface of the film to form a droplet on the film. The angle formed between the tangent to the liquid surface and the film surface at the point where the film and the liquid are in contact with each other, and the angle on the side containing the liquid was defined as the contact angle. Further, the contact angle was measured using methylene iodide instead of water, and the surface free energy was obtained from the following equation.
What is surface free energy (γs ^v : unit, mN / m)? K. Owens: J.M. Appl. Polym. Sci. , 13, 1741 (1969), from the contact angles θ _H2O and θ _{CH2I2 of} pure water H ₂ O and methylene iodide CH ₂ I ₂ experimentally determined on the antireflection film, the following simultaneous equations a , B, and defined by a value γs ^v (= γs ^d + γs ^h ) represented by the sum of γs ^d and γs ^h .
a. 1 + cos θ _H2O =
_{^{2√γs d (√γ H2O d / γ}} H2O v) + 2√γs h (√γ H2O h / γ H2O v)
b. 1 + cos θ _CH2I2 =
_{^{2√γs d (√γ CH2I2 d / γ}} CH2I2 v) + 2√γs h (√γ CH2I2 h / γ CH2I2 v)
γ _{H 2 O} ^d = 21.8, γ _{H 2 O} ^h = 51.0, γ _{H 2 O} ^v = 72.8,
γ _CH2I2 ^d = 49.5, _γCH2I2 ^h = 1.3, _γCH2I2 ^v = 50.8
Regarding the calculated surface free energies of Examples 1 to 6 and Comparative Examples 1 to 3, the surface free energy of Comparative Examples 1 is set to 100, and the surface free energies of the antireflection films of Examples 1 to 6 and Comparative Examples 2 and 3 are set. The relative values are shown in Table 3 below.

  The evaluation results are shown in Table 3.

As is clear from the results shown in Table 3, Comparative Examples 1 to 3 using the antifouling agent that does not satisfy the general formula (I) have a high refractive index of the low refractive index layer and a high relative surface free energy, It can be seen that the antifouling durability is low and the fingerprint wiping property is poor.
On the other hand, Examples 1 to 6 using the compound (A) represented by the general formula (I) have a low refractive index of the low refractive index layer, a low relative surface free energy, a high antifouling durability, and a fingerprint. It turns out that it is excellent also in wiping off.
In addition, compared with Comparative Examples 1 and 2, Examples 1 to 6 have a small difference in average reflectance (for example, the difference between Comparative Example 1 and Example 1 is 0.05%), but the effect of improving the visibility is high. It turns out that it is obtained.

Claims (10)

A polymerizable composition containing the following components (A), (B) and (C).
(A) A compound having a repeating unit having a polyether structure having a fluorine atom and four or more polymerizable groups, wherein the polymerizable group is a (meth) acryloyl group and represented by the following general formula (I) (B) Photopolymerization initiator (C) Organic solvent general formula (I)

In the general formula (I),
Rf _{1 to} Rf ₄ each independently represent a fluorine atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m1 F.
m1 represents an integer of 1 or more. n1 represents the number of repeating units and represents a positive integer.
Rf ₁ ~Rf ₄ are each independently, between the repeating units, a fluorine atom, an alkyl group having a fluorine atom, and _{-CF 2} -O- _{(CF 2)} different ones of the groups represented by _m1 F It may be.
Rf _{5 to} Rf ₈ each independently represent a fluorine atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m2 F.
n ₂ and n ₃ each independently represent a positive integer. When n ₂ and n ₃ are 2 or more, 2 or more Rf ₅ , 2 or more Rf ₆ , 2 or more Rf ₇ , or 2 or more Rf ₈ may be the same or different.
m2 represents an integer of 1 or more.
Provided _that at least one of Rf 1 ~Rf ₈ is a linear perfluoro alkyl group or _-CF 2 -O- _{(CF 2)} a group represented by _m F 2 to 8 carbon atoms. m represents an integer of 1 to 10.
Rf ₉ and Rf ₁₀ each independently represent a hydrogen atom, a linear perfluoroalkyl group having 2 to 8 carbon atoms, or a group represented by —CF ₂ —O— (CF ₂ ) _m3 F.
m3 represents an integer of 1 or more.
L ₁ represents an aliphatic (p1 + 1) -valent linking group, and L ₂ represents an aliphatic (p2 + 1) -valent linking group. p1 and p2 each independently represent an integer of 2 or more.
X ₁ and X ₂ each independently represents a (meth) acryloyl group .   A polymerizable composition containing the following components (A), (B) and (C).
(A) A compound having a repeating unit having a polyether structure having a fluorine atom and four or more polymerizable groups, wherein the polymerizable group is a (meth) acryloyl group and represented by the following general formula (I)
(B) Photopolymerization initiator
(C) Organic solvent
Formula (I)

  In the general formula (I),
  Rf ₁ ~ Rf ₄ Each independently represents a fluorine atom, an alkyl group having a fluorine atom, or -CF ₂ -O- (CF ₂ ) _m1 The group represented by F is represented.
  m1 represents an integer of 1 or more. n1 represents the number of repeating units and represents a positive integer.
  Rf ₁ ~ Rf ₄ Each independently represents a fluorine atom, an alkyl group having a fluorine atom, and -CF between the repeating units. ₂ -O- (CF ₂ ) _m1 Different ones of the groups represented by F may be used.
  Rf ₅ ~ Rf ₈ Each independently represents a fluorine atom, an alkyl group having a fluorine atom, or -CF ₂ -O- (CF ₂ ) _m2 The group represented by F is represented.
  n ₂ And n ₃ Each independently represents a positive integer. n ₂ And n ₃ When R is 2 or more, 2 or more Rf ₅ 2 or more Rf ₆ 2 or more Rf ₇ 2 or more Rf ₈ May be the same or different.
  m2 represents an integer of 1 or more.
  Rf ₉ And Rf ₁₀ Each independently represents a hydrogen atom, an alkyl group having a fluorine atom, or -CF ₂ -O- (CF ₂ ) _m3 The group represented by F is represented.
  m3 represents an integer of 1 or more.
  p1 and p2 each independently represent an integer of 2 or more.
  X ₁ And X ₂ Each independently represents a (meth) acryloyl group.
  L ₁ And L ₂ Each independently represents a linking group represented by any of the following formulae.

  In the above formula, R represents an alkyl group, * represents a site connected to an adjacent oxygen atom in the general formula (I), and ** represents X ₁ Or X ₂ Represents the part connected to. In the general formula _(I), Rf 1 at least one ～Rf ₈ is linear perfluoroalkyl group or _-CF 2 -O- _{(CF 2)} 2 to 8 carbon atoms group represented by _m F (m Represents an integer of 1 to 10, and Rf ₉ and Rf ₁₀ are each represented by a hydrogen atom, a linear perfluoroalkyl group having 2 to 8 carbon atoms, or the aforementioned —CF ₂ —O— (CF ₂ ) _{m 3} F. The polymerizable composition according to claim 2 , which represents a group to be formed. The repeating units in the compound (A), _{Rf 1 Rf} 1 ~Rf ₄ in ～Rf within ₄ included in the repeating units are the same number of types and the group table to group claim 1-3 The polymerizable composition according to any one of the above. An antireflection film having at least one low refractive index layer on a transparent support, wherein the low refractive index layer is formed from the polymerizable composition according to any one of claims 1 to 4. Anti-reflection film. A polarizing plate comprising a polarizing film and two protective films protecting both surfaces of the polarizing film, wherein at least one of the protective films is the antireflection film according to claim 5 . An image display device comprising the antireflection film according to claim 5 or the polarizing plate according to claim 6 on an outermost surface of the display. A method for producing a compound having a repeating unit having a polyether structure having a fluorine atom and four or more polymerizable groups, wherein the polymerizable group is a (meth) acryloyl group and represented by the following general formula (I) Because
The manufacturing method which has the process of obtaining the repeating unit which has the polyether structure which has the said fluorine atom by processing the compound represented with the following general formula (II) by a liquid phase fluorination method.
Formula (I)

In the general formula (I),
Rf _{1 to} Rf ₄ each independently represent a fluorine atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m1 F.
m1 represents an integer of 1 or more. n1 represents the number of repeating units and represents a positive integer.
Rf ₁ ~Rf ₄ are each independently, between the repeating units, a fluorine atom, an alkyl group having a fluorine atom, and _{-CF 2} -O- _{(CF 2)} different ones of the groups represented by _m1 F It may be.
Rf _{5 to} Rf ₈ each independently represent a fluorine atom, an alkyl group having a fluorine atom, or a group represented by —CF ₂ —O— (CF ₂ ) _m2 F.
m2 represents an integer of 1 or more. n ₂ and n ₃ each independently represent a positive integer. When n ₂ and n ₃ are 2 or more, 2 or more Rf ₅ , 2 or more Rf ₆ , 2 or more Rf ₇ , or 2 or more Rf ₈ may be the same or different.
Provided _that at least one of Rf 1 ~Rf ₈ is a linear perfluoro alkyl group or _-CF 2 -O- _{(CF 2)} a group represented by _m F 2 to 8 carbon atoms. m represents an integer of 1 to 10.
Rf ₉ and Rf ₁₀ each independently represent a hydrogen atom, a linear perfluoroalkyl group having 2 to 8 carbon atoms, or a group represented by —CF ₂ —O— (CF ₂ ) _m3 F.
m3 represents an integer of 1 or more.
L ₁ represents an aliphatic (p1 + 1) -valent linking group, and L ₂ represents an aliphatic (p2 + 1) -valent linking group. p1 and p2 each independently represent an integer of 2 or more.
X ₁ and X ₂ each independently represents a (meth) acryloyl group .
Formula (II)

In the general formula (II),
A and B each independently represent a hydroxyl-protecting group.
R _{1 to} R ₄ each independently represent a hydrogen atom, an alkyl group, or a group represented by —CH ₂ —O— (CH ₂ ) _m1 H. m1 represents an integer of 1 or more. n represents a positive integer.
R _{1 to} R ₄ may be independently different from each other among the repeating units among a group represented by a hydrogen atom, an alkyl group, and —CH ₂ —O— (CH ₂ ) _m1 H. Good.   A method for producing a compound having a repeating unit having a polyether structure having a fluorine atom and four or more polymerizable groups, wherein the polymerizable group is a (meth) acryloyl group and represented by the following general formula (I) Because
  The manufacturing method which has the process of obtaining the repeating unit which has the polyether structure which has the said fluorine atom by processing the compound represented with the following general formula (II) by a liquid phase fluorination method.
  Formula (I)

  In the general formula (I),
  Rf ₁ ~ Rf ₄ Each independently represents a fluorine atom, an alkyl group having a fluorine atom, or -CF ₂ -O- (CF ₂ ) _m1 The group represented by F is represented.
  m1 represents an integer of 1 or more. n1 represents the number of repeating units and represents a positive integer.
  Rf ₁ ~ Rf ₄ Each independently represents a fluorine atom, an alkyl group having a fluorine atom, and -CF between the repeating units. ₂ -O- (CF ₂ ) _m1 Different ones of the groups represented by F may be used.
  Rf ₅ ~ Rf ₈ Each independently represents a fluorine atom, an alkyl group having a fluorine atom, or -CF ₂ -O- (CF ₂ ) _m2 The group represented by F is represented.
  m2 represents an integer of 1 or more. n ₂ And n ₃ Each independently represents a positive integer. n ₂ And n ₃ When R is 2 or more, 2 or more Rf ₅ 2 or more Rf ₆ 2 or more Rf ₇ 2 or more Rf ₈ May be the same or different.
  Rf ₉ And Rf ₁₀ Each independently represents a hydrogen atom, an alkyl group having a fluorine atom, or -CF ₂ -O- (CF ₂ ) _m3 The group represented by F is represented.
  m3 represents an integer of 1 or more.
  p1 and p2 each independently represent an integer of 2 or more.
  X ₁ And X ₂ Each independently represents a (meth) acryloyl group.
  L ₁ And L ₂ Each independently represents a linking group represented by any of the following formulae.

  In the above formula, R represents an alkyl group, * represents a site connected to an adjacent oxygen atom in the general formula (I), and ** represents X ₁ Or X ₂ Represents the part connected to.
Formula (II)

  In the general formula (II),
  A and B each independently represent a hydroxyl-protecting group.
  R ₁ ~ R ₄ Each independently represents a hydrogen atom, an alkyl group, or -CH. ₂ -O- (CH ₂ ) _m1 The group represented by H is represented. m1 represents an integer of 1 or more. n represents a positive integer.
  R ₁ ~ R ₄ Each independently represents a hydrogen atom, an alkyl group, and -CH between the repeating units represented by the general formula (II). ₂ -O- (CH ₂ ) _m1 Different ones of the groups represented by H may be used. The production method according to claim 8 or 9, further comprising a step of obtaining the compound represented by the general formula (II) by ring-opening polymerization of an epoxy ring of a compound represented by the following general formula (III).
Formula (III)

In the general formula _(III), R 1 ~R ₄ have the same meanings as _R 1 to R ₄ in the general formula (II).