JPH09133802A - Antireflection filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems, such as contamination resistance, slipperiness and wear resistance, by providing the antireflection filter with a transparent base material, antireflection films and a surface treatment layer formed with the film of surface treating agent contg. a specific phosphazene compd. SOLUTION: This antireflection filter has the transparent base material 2, a single or double layers of the antireflection films 3 disposed on the transparent base material 2 and the surface treatment layer formed with the film of the surface treating agent 6 expressed by formula on the surface of the outermost partition film of the antireflection films 3. In the formula, substituents R, Q denote long-chain hydrocarbon group or fluoropolyether and (n) is a positive integer of <=6. Namely, the antireflection filter 1 is coated with the surface treating agent 5 contg. the phosphazene compd. having the long-chain hydrocarbon expressed by the formula or the fluoropolyether in order to impart the surface characteristics, such as contamination resistance, slipperiness, wear resistance and hardly sticking of fingermarks. The phosphazene compd. are formed by bonding the long-chain hydrocarbon or the fluoropolyether with the substitutent R and/or Q.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an excellent stain resistance,
The present invention relates to an antireflection filter having scratch resistance, work resistance, slipperiness, wear resistance and the like.

[0002]

2. Description of the Related Art Conventionally, an antireflection filter has been provided for a CRT front plate, a liquid crystal display or the like as an antiglare application. In this antireflection filter, an inorganic multilayer thin film is provided on the front surface of the display as an antireflection film on a glass plate or a plastic plate, and an inorganic multilayer thin film is provided on the plastic film as an antireflection film.
There are a type in which this film is attached to a glass plate or a plastic plate and is placed on the front surface of the display, and a type in which a plastic film provided with an inorganic multilayer thin film as an antireflection film is directly attached to the display surface.

A conventional antireflection filter has a two-layer antireflection film on a transparent substrate (Japanese Patent Laid-Open No. 58-46).
No. 301 and JP-A-59-50401) and those having a three-layer antireflection film on a transparent substrate (JP-A-59-49501 and JP-A-59-50).
No. 401) and one having a four-layer antireflection film on a transparent substrate (described in JP-A-61-168899).

As the transparent substrate, molded products such as glass and plastics, sheets and films have been used. In particular, a plastic base material may be previously coated with a coating material for the purpose of improving and imparting physical properties such as adhesion, hardness, chemical resistance, durability and dyeability. However, these coating materials do not impair the transparency of the transparent substrate.

The antireflection film is formed by depositing an inorganic oxide on a transparent substrate, or is a liquid composition in which inorganic fine particles are mixed with an organic material, or an inorganic material is formed by adding inorganic fine particles. Some of them are mixed and applied on a transparent substrate.

Inorganic oxides such as SiO ₂ are formed on a transparent substrate by physical vapor deposition (physica) represented by vacuum vapor deposition, ion plating and sputtering.
The film is formed by the lvapour deposition (PVD) method.

The liquid composition is formed into a film on a transparent substrate by a method used in ordinary coating operations represented by curtain flow coating, dip coating, spin coating and the like. The liquid composition is a composition in which approximately 30% of inorganic fine particles are dispersed in an organic material, or an inorganic material that can be dispersed or dissolved in a solvent, or is itself liquid, or such an organic material and an inorganic material. A mixture of materials has been used.

The inorganic fine particles, when dispersed in an organic material, give a hard surface hardness when the organic material is hardened or dried to form an antireflection film. Furthermore, the inorganic fine particles can be dispersed or dissolved in a solvent, or can be dispersed in an inorganic material that is itself liquid. Also in this case, the inorganic fine particles give a hard surface hardness when the inorganic material is hardened or dried to form an antireflection film.

In the above antireflection filter, the antireflection film has a high surface hardness because of the inorganic oxide or the inorganic fine particles, but the antireflection film has stain resistance, abrasion resistance, slipperiness,
The surface properties such as water repellency were not satisfactory.

Therefore, the surface of the antireflection film is coated with various surface treatment agents to improve the physical properties of the surface. This surface treatment agent has been used, for example, a fluorine-based material such as polytetrafluoroethylene for the purpose of imparting slipperiness and water repellency to the surface of the antireflection filter deposited on the surface (JP-A-3-266801).

[0011]

However, the above-mentioned antireflection filter having an antireflection film on its surface has a problem that it is liable to be soiled and is apt to be scratched due to poor surface slipperiness. It was

Further, the antireflection filter having the antireflection film coated with the above-mentioned surface treatment agent has improved water repellency, but no satisfactory result with respect to friction or abrasion has been obtained.

Therefore, it is an object of the present invention to provide an antireflection filter that solves the problems of stain resistance, slipperiness, wear resistance and the like.

[0014]

An antireflection filter according to the present invention, which achieves this object, comprises a transparent substrate and a single-layer or multilayer antireflection film provided on the transparent substrate,
A surface treatment layer in which the surface treatment agent represented by Chemical formula 2 is coated on the surface of the outermost diaphragm of the antireflection film.

[0015]

Embedded image

Therefore, the antireflection filter having the above structure is coated with the surface treatment agent containing the phosphazene compound having the long-chain hydrocarbon group or fluoropolyether shown in Chemical formula 2 on the surface of the antireflection film. As a result, the lubricity of the phosphazene compound is imparted to the surface of the antireflection filter.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an antireflection filter according to the present invention will be described in detail below with reference to the drawings. For example, image display devices typified by broadcast receiving televisions have rapidly diversified in recent years due to the development of computer-applied information systems. Here, the image refers to static and moving images such as characters, numbers and figures that can be visually perceived by humans.

The image display device visualizes information by external light control (controls the amount of light entering the eye in the optical path of external light) or light emission control (controls input energy of the light emitter), and direct-views or projects the information. Is an image. Examples of these include cathode ray tubes (CRTs), laser displays, photochromic displays, electro-luminescent displays, liquid crystal displays, plasma displays, light emitting diode displays, light valves and the like. Furthermore, the antireflection filter according to the present invention is not limited to the above-mentioned various display devices,
It also includes a front plate having an antireflection filter on the front surface of the device or the like.

As shown in FIG. 1, the antireflection filter 1
Is formed by forming a two-layer antireflection film 3 on the transparent substrate 2 and forming a surface treatment agent 5 on the antireflection film 3. Further, as shown in FIG. 2, in the antireflection filter 1, the antireflection film 4 consisting of three layers is formed on the transparent substrate 2, and the surface treatment agent 5 is formed on the antireflection film 4. Is configured.

The antireflection filter 1 has a long-chain hydrocarbon group or fluoropolyene represented by Chemical Formula 2 in order to impart surface physical properties such as stain resistance, slipperiness, abrasion resistance, and hard to handle. A surface treatment agent 5 containing a phosphazene compound having an ether is applied. In the phosphazene compound, a long chain hydrocarbon group or a fluoropolyether is bonded to the substituents R and / or Q as shown in Chemical formula 2. The substituents R and Q shown in Chemical formula 2 may be the same or different. Further, n in Chemical Formula 2 may be a positive integer of 6 or less, or 0.

The fluoropolyether should be present in order to improve the wettability, which is the performance of the surface treatment agent 5, but it is not necessary to be present. Therefore, the ratio of fluoropolyether / hydrocarbon may be 0 or more, but is preferably 5 or less in consideration of solubility in a solvent. Further, the functional groups shown below are used in the fluoropolyether, but the functional groups are not limited to these.

As the monofunctional fluoropolyether, F (CF ₂ CF ₂ CF ₂ O) _n , CF ₃ (OCF (C
F ₃ ) CF ₂ ) _m (OCF ₂ ) _j , F (C (CF ₃ ) FCF ₂
O) _{k and the} like, and polyfunctional fluoropolyethers include (OC ₂ F ₄ ) _p (OCF ₂ ) _{q and the} like.

Here, j, m, n, k in the above chemical formula,
p and q represent an integer of 1 or more.

Further, the long-chain hydrocarbon group preferably has 10 or more carbon atoms in consideration of the solubility in a volatile solvent which is a nonpolar solvent. However, in the phosphazene compound, among the substituents R and Q shown in Chemical formula 2,
It suffices that at least one is a long-chain hydrocarbon group having 10 or more carbon atoms, and if the other is a methyl group, the performance as the surface treatment agent 5 is not affected.

As a coating method, a method used in ordinary coating work can be used, but the uniformity of antireflection effect,
Further, spin coating, dip coating, curtain flow coating and the like are used from the viewpoint of controlling the reflection interference color. As a coating method, a method of impregnating paper, cloth or the like with the surface treatment agent 5 and casting it from the viewpoint of workability is also used.

In the above coating method, the surface to be coated is preferably washed. As the cleaning method, removal of dirt with a surfactant, degreasing with an organic solvent, steam cleaning with Freon, and the like are used. Further, it is effective that the surface to be applied is subjected to pretreatment in order to improve the adhesion and durability of the surface treatment agent 5. For example, the pretreatment includes chemical treatment with active gas, acid or alkali.

The surface treatment agent 5 is prepared by diluting a phosphazene compound having a long-chain hydrocarbon group or fluoropolyether shown in Chemical formula 2 in a volatile solvent.
The volatile solvent is not particularly limited, but in use, it should be determined in consideration of stability of the composition, wettability to a coated surface, volatility and the like. The volatile solvent is limited to a fluorocarbon or perfluoroalkane system when the side chains represented by the substituents R and Q in Chemical formula 2 are only fluoropolyether. However, the volatile solvent is not limited to the substituents R and Q.
When contains a long-chain hydrocarbon group, the phosphazene compound shown in Chemical formula 2 is soluble in ordinary organic solvents such as ether, alcohol, and acetone, and can be used as a mixture of several kinds of organic solvents.

Further, the film thickness of the surface treatment agent 5 composed of the phosphazene compound having the long-chain hydrocarbon group or the fluoropolyether shown in Chemical formula 2 is not particularly limited, but it is antireflection property and water resistance. 0.5 nm to 10 nm from the balance with static contact angle and the relationship with surface hardness
Is preferred.

The surface treatment agent 5 formed as described above is
It is applied on the antireflection film provided on the transparent substrate 2.

The transparent base material 2 has an antireflection effect.
If one main surface is sufficient, the other main surface of the transparent substrate can be used as the transparent substrate 2 in the present invention even if it is covered with an opaque material. The transparent substrate 2 may be any substrate as long as it is made of an organic polymer, but its optical properties such as transparency, refractive index and dispersion, impact resistance, heat resistance,
From the viewpoint of physical properties such as durability, polymethyl methacrylate and its copolymers, polycarbonate, diethylene glycol bisacryl carbonate (CR-39),
(Brominated) bisphenol A di (meth) acrylate polymer and copolymer thereof, (brominated) bisphenol A
Poly (meth) acrylate urethane-modified monomer polymers and their copolymers, especially polyester terephthalate, polyethylene naphthalate and unsaturated polyester, acrylonitrile-styrene copolymer, vinyl chloride, polyurethane, epoxy resin, aramid resin Is preferred.

The antireflection layer 3 contains S mainly as an inorganic oxide.
iO_TwoIs used, but other than Al_TwoO _Three, ZrO_Two, TiO
_Two, SiO, HfO_Two, ZnO, In_TwoO_Three/ SnO_Two, T
iO, Ti_TwoO_Three, Y_ThreeO_Three, Sb_TwoO_Three, MgO, CeO_Two
Inorganic oxides such as are applied. To these inorganic oxides
The antireflection film 3 thus formed has a SiO 2 surface._TwoIn
Preferably. SiO_TwoAnti-reflection formed by
The stop film 3 has a sufficient surface hardness and is an object of the present invention.
To improve wear resistance and wear resistance.
It is planned.

The optical film thickness of the antireflection film 3 should be determined according to the required performance in addition to the antireflection effect. There are conditions. Here, the optical film thickness is defined by the product of the refractive index and the film thickness of the film forming material.

In the case of the antireflection film 3 consisting of two layers, the refractive index of the first layer 3A on the transparent substrate 2 side is as shown in FIG.
It has a higher refractive index than both the transparent substrate 2 and the second layer 3B provided on the first layer 3A. Then, the optical film thicknesses of the first layer 3A and the second layer 3B satisfy the following conditions.

First layer 3A mλ / 4 × 0.7 <n ₁ d ₁ <mλ / 4 × 1.3 Second layer 3B nλ / 4 × 0.7 <n ₂ d ₂ <nλ / 4 × 1. 3 (where n ₁ and n ₂ are the refractive indexes of the first layer 3A and the second layer 3B, d ₁ and d ₂ are the film thickness (nm unit) of the first layer 3A and the second layer 3B, and m is A positive integer, n is a positive odd number, and λ is an arbitrary reference wavelength (nm unit) in the visible peripheral region.) In the case of the antireflection film 4 including three layers, the first on the transparent substrate 2 side The refractive index of the layer 4A is, as shown in FIG.
It is set to be higher than the refractive index of the transparent base material 2 and lower than the refractive index of the second layer 4B provided on the first layer 4A. Furthermore, the third layer 4C provided on the second layer 4B has a lower refractive index than the first layer 4A and the second layer 4A. Then, the first layer 4A and the second layer 4B
The optical film thickness of the third layer 4C satisfies the following conditions.

First layer 4A lλ / 4 × 0.7 <n ₁ d ₁ <lλ / 4 × 1.3 Second layer 4B mλ / 4 × 0.7 <n ₂ d ₂ <mλ / 4 × 1. 3 3rd layer 4C nλ / 4 × 0.7 <n ₃ d ₃ <nλ / 4 × 1.3 (where n ₁ , n ₂ , and n ₃ are the first layer 4A, the second layer 4B, and the third layer, respectively). Refractive index of the layer 4C, d ₁ , d ₂ , and d ₃ are film thicknesses (nm units) of the first layer 4A, the second layer 4B, and the third layer 4C, l is a positive integer, and m is a positive integer. n is a positive odd number, λ
Is an arbitrary reference wavelength (nm unit) in the visible peripheral region. ) Further, the antireflection film 3 made of an inorganic oxide is formed by using the above-mentioned inorganic material in a vacuum deposition method, an ion plating method,
Physical vapor deposition method represented by sputtering method (Phys
ical Vapor Deposition, PV
It is obtained by forming a film by the method D).

The antireflection film 3 may be formed as a film by applying it as a liquid composition on the transparent substrate 2. In this case, the liquid composition used has a viscosity of 10 poise or less, preferably 1 poise or less at the application temperature during the coating operation. As a coating method, a method used in ordinary coating work can be used, but from the viewpoint of controlling the film thickness, curtain flow coating,
Immersion coating and spin coating are preferred.

The liquid composition may be one which satisfies the condition of the refractive index as a coating and can be dispersed or dissolved by itself or in a solvent, but is particularly an inorganic material to the extent that transparency is not impaired in an organic material or an organic material. Any of a dispersion of fine particles, an inorganic material having a film-forming property, which is dispersed or dissolved in a solvent, or which is liquid itself, or a mixture of the above organic material and the above inorganic material is used. .

Examples of the organic material include various polymer compositions such as polycarbonate, various curable resin forming compositions such as melamine resins, and urethane forming compositions such as aromatic isocyanates as substances having a relatively high refractive index. Further, the organic material, as a substance having a relatively low refractive index, a vinyl-based copolymer containing an acrylic that does not contain an aromatic ring, various fluorine-substituted polymers, a polyester-based polymer fiber derivative that does not contain an aromatic ring, Silicone-based polymers include hydrocarbon-based polymers.

Since the inorganic fine particles have a high refractive index, the organic material in which the inorganic fine particles are dispersed has a relatively low refractive index even when the antireflection film 3 having a high refractive index is formed. Is used. The organic material in which the inorganic fine particles are dispersed or dissolved also includes an organically substituted silicon compound.

Inorganic materials that have a film-forming property and are dispersed or dissolved in a solvent, or are themselves liquid, include alkoxides of various elements, salts of organic acids, and coordination compounds as substances having a relatively high refractive index. There are coordination compounds bound to. Examples of these include metal alcoholate compounds such as titanium tetraethoxide, chelate compounds such as dibutoxytitanium bisacetylacetonate, and active inorganic polymers such as ammonium zirconyl carbonate. Also,
Inorganic materials that have a film-forming property and are dispersed or dissolved in a solvent, or are themselves liquid, include substances with a relatively low refractive index, such as organic substituted silicon compounds that do not contain aromatic rings, various alkyl silicates, Fine particle silica such as silica sol dispersed in a colloidal form is used.

In the case of the two-layer antireflection film 3, the liquid composition of the first layer 3A is applied on the transparent substrate 2, and the liquid composition of the second layer 3B is applied on the first layer 3A. The composition is applied. At this time, the refractive index of the liquid composition of the first layer 3A is 0.03 or more, preferably 0.05 or more than both the refractive index of the transparent substrate 2 and the refractive index of the liquid composition of the second layer 3B. It should be expensive.

In the case of the antireflection film 4 consisting of three layers,
The layer constitution is such that the liquid composition of the first layer 4A is applied on the transparent substrate 2, the liquid composition of the second layer 4B is applied on the first layer 4A, and the liquid composition of the second layer 4B is applied on the second layer 4B. The liquid composition of 3 layers 4C is applied. At this time, the refractive index of the liquid composition of the first layer 4A is 0.03 or more, preferably 0.05 or more than both the refractive index of the transparent substrate 2 and the refractive index of the liquid composition of the third layer 4C.
More than that. On the other hand, the refractive index of the liquid composition of the second layer 4B is 0.
It is set to 03 or more, preferably 0.05 or more.

When each layer of the antireflection film 3 and the antireflection layer 4 is applied, the adhesion can be improved by subjecting the layers in contact with each other to chemical treatment and physical treatment.

The liquid composition is coated with the first layer 3A on the transparent substrate 2 by the above-mentioned coating method. The second layer 3B may be applied after the first layer 3A is applied and cured and / or dried, or may be preliminarily cured and / or dried and then applied. When pre-cured and / or dried, the antireflection coating 3 is simultaneously cured and / or dried after all layers have been applied.

In the antireflection filter 1 configured as described above, the lower layer of the surface treatment agent 5 is the antireflection film 3 as described above, but it is not limited to such a configuration.

That is, the surface treatment agent 5 may have a lower layer coated with a coating material such as a hard coat. Rather, the surface treatment agent 5 can improve various physical properties such as adhesion, hardness, chemical resistance, durability, and dyeability by the coating material of the lower layer.

Further, the surface treatment agent 5 is, for example, JP-B-150-2.
8092, Japanese Patent Publication No. 50-28446, Japanese Patent Publication No. 50-39449, Japanese Patent Publication No. 51-24368, Japanese Patent Publication No. 52-112698, Japanese Patent Publication No. 57-2735. Hardness can be improved by applying on the chemical conversion coating. Furthermore, the surface treatment agent 5 can be applied to the surface of an acrylic crosslinked product synthesized from (meth) acrylic acid and pentaerythritol.

[0048]

EXAMPLES Specific examples of the present invention and experiments for demonstrating the performance of the examples are shown below. However, the present invention
The present invention is not limited to the following embodiments.

Example 1 The phosphazene compound used in this example has a structure in which the substituent R in the compound shown in Chemical formula 2 has 1 carbon atoms.
8 alkyl group, the substituent Q is CH ₂ CF ₂ (CF
₂ O) _n (C ₂ F ₄ O) _m CF ₂ CH ₂ (n and m are 1
The above integer).

The surface treatment agent 5 was prepared by adding 0.4 part by weight of the phosphazene compound, 380 parts by weight of hexane, and 20 parts of alcohol.
Parts by weight were added and mixed to form a uniform solution, which was then filtered with a membrane filter to prepare.

As the transparent substrate 2, a polyethylene terephthalate (PET) film with a hard coat having a thickness of 100 μm was used.

The antireflection film 3 is formed of PET by vacuum vapor deposition.
The first layer 3A of 120 nm thick ITO on one side of the film
As a second layer 3B on which SiO ₂ is pre-deposited
Was formed to a thickness of 70 nm by vapor deposition.

The antireflection filter 1 was obtained by dip-coating the antireflection film 3 with the surface treatment agent 5 at a pulling rate of 5 cm / min.

Examples 2 to 10 In this example, the phosphazene compound is a phosphazene compound having a long-chain hydrocarbon group or fluoropolyether shown in Chemical formula 2, and the substituents R and Q are shown in Table 1.
It has the structure shown in.

[0055]

[Table 1]

The surface treatment agent 5 is the same as in Example 2
Was prepared in the same manner as in Example 1 using the phosphazene compound of Example 10. Also, anti-reflection filter 1
Was obtained in the same manner as in Example 1.

Comparative Examples 1 to 3 For comparison, phosphazene compounds were obtained in the same manner as in Example 1 assuming that the substituents R and Q shown in Chemical formula 2 had the structures shown in Table 2.

[0058]

[Table 2]

Comparative Example 4 to Comparative Example 8 In this Comparative Example, the antireflection filter 1 was one not coated with the surface treatment agent 5 (Comparative Example 4) and the surface treatment agent 5.
Was coated with a fluorine-based resin (Comparative Examples 5 to 8) in the same manner as in Example 1. Specifically, polytetrafluoroethylene was used as the surface treatment agent 5, and Comparative Example 5 and polyvinylidene fluoride were used as the surface treatment agent 5.
Comparative Example 6, a tetrafluoroethylene-ethylene copolymer as the surface treatment agent 5 and Comparative Example 7 and a chlorotrifluoroethylene-ethylene copolymer as the surface treatment agent 5 were obtained.

Performance Evaluation Test A performance test was conducted on the antireflection filters 1 of Examples 1 to 10 and Comparative Examples 1 to 8 obtained as described above by the following method.

1 Contamination resistance test In the contamination resistance test, 5 ml of tap water was dropped on the filter surface, left for 48 hours in a room temperature atmosphere, and then the remaining state of the scale was observed when the scale was wiped with a cloth. It was judged by doing.

The result is good when the scale can be removed,
When it could not be removed, it was regarded as defective.

2 Slidability Test The slidability test was judged by the degree of scratching when the filter surface was scratched with a pencil. The result is ○ when it is not scratched at all, △ when it is strongly scratched,
Even when it was weakly scratched, it was rated as × when it was caught.

3 Abrasion resistance test In the abrasion resistance test, the surface of the filter was steel wool # 00.
It was judged by observing the state of the surface after rubbing 30 times with a load of 200 g under a load of 200 g. The results were evaluated as O when no scratches were made, Δ when fine scratches were made, and X when significantly scratched.

4 Dust resistance test The hand resistance test was judged by contacting the filter surface with a fingertip and then observing the surface condition.
The results are indicated by ○ when the stains are not noticeable even when they are attached, Δ when the stains can be easily removed even if the stains are attached, and × when the stains are noticeable after the stains are attached.

Test Results Table 3 shows the test results of Examples 1 to 10 for the tests shown in 1-4.

[0067]

[Table 3]

Table 4 shows the test results of Comparative Examples 1 to 3 for the tests shown in 1 to 4.

[0069]

[Table 4]

Table 5 shows the test results of Comparative Examples 5 to 8 for the tests shown in 1-4.

[0071]

[Table 5]

As is clear from Tables 3 and 4, in the case of the phosphazene compound having the long-chain hydrocarbon group or fluoropolyether shown in Chemical formula 2, the surface treatment agent was a stain resistance test and a slip test. Good results were obtained in the abrasion resistance test and the dross resistance test.
Further, as is clear from Table 3 and Table 5, the surface treatment agent is
In the case of the phosphazene compound having a long-chain hydrocarbon group or fluoropolyether shown in Chemical formula 2, stain resistance test, slip resistance test, abrasion resistance test, and hand stain resistance are lower than those of fluororesin. In the test all good results were obtained.

[0073]

According to the antireflection filter of the present invention,
A transparent base material, a single-layer or multi-layer antireflection film provided on the transparent base material, and a surface of the outermost diaphragm of the antireflection film coated with the surface treatment agent represented by Chemical formula 2 By providing the treatment layer, the surface properties of the antireflection filter, such as stain resistance, slipperiness, abrasion resistance, and resistance to hand stain, can be improved.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a partial main part of an antireflection filter including a two-layer antireflection film according to the present invention.

FIG. 2 is a vertical cross-sectional view of a partial main part of an antireflection filter including a three-layer antireflection film according to the present invention.

[Explanation of symbols]

 1. Anti-reflection filter 2. Transparent substrate 3.4. Antireflection film 5. Surface treatment agent

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tomio Kobayashi 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (2)

[Claims] 1. A transparent substrate, a single-layer or multi-layer antireflection film provided on the transparent substrate, and a surface treatment agent containing a phosphazene compound represented by Chemical Formula 1 on the surface of the antireflection film. An antireflection filter comprising: a surface-treated layer coated with. Embedded image 2. The antireflection filter according to claim 1, wherein at least the portion near the surface of the antireflection film is made of a substance containing silicon dioxide.