JPH10120445A - Filter for displaying device and displaying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a filter for a displaying device having a reflection preventing property, excellent in fouling resistance, scratching resistance and processing resistance by coating the surface of a reflection preventing membrane installed on a glass base material with a coating composition containing a specific alkoxysilane compound. SOLUTION: This filter 10 for a displaying device is obtained by installing a single-layered or multiple-layered reflection preventing membrane 2 on the one side surface of a glass base material 1, and a surface modifying membrane 3 using a coating composition containing an alkoxysilane compound having a perfluoropolyether group expressed by the following formula. The formula: Rf [COR1 R2 -Si(OR3 )3 ]j [Rf is a perfluoropolyether group; R1 is a bivalent atom or group of atoms; R2 is a non-substituted or substituted bivalent hydrocarbon group; R3 is a non-substituted or substituted monovalent hydrocarbon group; (j) is 1 or 2]. The coating composition preferably contains catalyst such as an acid, a base, a phosphoric acid ester and a β-diketone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-reflection filter having excellent anti-reflection properties such as stain resistance, abrasion resistance and processing resistance, and used as a CRT anti-reflection filter or a front panel. And a display device having the same.

[0002]

2. Description of the Related Art When an object is viewed through a transparent material, it is troublesome that the reflected light is strong and the reflected image is clear. For example, a reflected image called a ghost or a flare occurs in a lens for spectacles, causing discomfort to the eyes. Or Further, in the case of a looking glass or the like, there is a problem that the contents are not clear due to the reflected light on the glass surface. Furthermore, in order to make the image clear even on a panel surface of a flat display such as a cathode ray tube or a liquid crystal of a television, it is preferable that the reflection on the panel surface is small.

Conventionally, a method of forming a material having a refractive index different from that of the base material on the base material by a vacuum deposition method or the like for preventing reflection has been performed. In this case, in order to maximize the antireflection effect, it is known that it is important to select the thickness of the substance covering the substrate.

For example, in the case of a single-layer film, it is necessary to select a substance having a lower refractive index than that of the base material to have an optical thickness of 1/4 or an odd multiple of the target light wavelength, that is, a minimum reflectance, that is, a maximum transmittance. It is known to give. Here, the optical film thickness is given by the product of the refractive index of the film forming material and the film thickness of the film. Furthermore, it is possible to form a multilayer antireflection film, and in this case, several proposals have been made regarding the selection of the film thickness (Optical Technology Contact Vol. 9,
No. 8, page 17 (1971)).

On the other hand, JP-A-58-46301, JP-A-59-49501, and JP-A-59-50401.
Japanese Patent Application Laid-Open Publication No. H11-176,086 describes a method of forming an antireflection film comprising a plurality of layers, which satisfies the above-mentioned optical film thickness condition, using a liquid composition.

[0006]

The antireflection film formed by the vapor deposition method is mainly composed of an inorganic oxide or an inorganic halide as a film-forming material. There is a drawback that dirt such as fingerprints, sweat, hair liquid, hair spray and the like are conspicuous and the dirt is difficult to remove. Further, there is a problem in that the surface is poor in slipperiness and the scratches become thicker. In addition, since wettability to water is large, raindrops and water droplets spread greatly when they adhere, and there is a problem in that an object appears distorted over a large area in an eyeglass lens or the like.

JP-A-58-46301, JP-A-5-46301
In order to impart a hard surface hardness also to the antireflection film described in JP-A-9-49501 and JP-A-59-50401, the outermost layer film contains 30% by weight or more of an inorganic substance typified by silica fine particles or the like. However, the antireflection film obtained from such a film composition has problems such as poor surface slip and easy damage due to abrasion of a cloth or the like.

Various surface treatment agents have been proposed and marketed for the purpose of resolving these problems, but all of them have a temporary function because they are dissolved by water or various solvents. There was no durability and poor durability. Further, JP-A-3-266801 reports that a fluorine-based resin layer is formed in order to impart water repellency. However, although these fluororesins certainly increase the water repellency, satisfactory results with respect to friction or wear have not been obtained.

The present invention has been made in view of such circumstances, has excellent anti-reflection properties such as stain resistance, scratch resistance, and processing resistance, and is used as a front plate of a display device such as a CRT. It is an object of the present invention to provide a suitable display device filter and a display device having the same.

[0010]

The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have reached the present invention described below. That is, in order to achieve the above object, the display device filter according to the present invention,
The surface of a single-layer or multi-layer antireflection film provided on a glass substrate is modified using a coating composition containing an alkoxysilane compound having a perfluoropolyether group represented by the following general formula (1). Characterized by being coated with a membrane.

R _f ｛COR ₁ —R ₂ —Si (OR ₃ ) ₃ ｝ _j (1) (where R _f is a perfluoropolyether group, R ₁ is a divalent atom or atomic group, R ₂ is an unsubstituted or substituted divalent hydrocarbon group, R ₃ is an unsubstituted or substituted monovalent hydrocarbon group, and j is 1 or 2.) In addition, the display device according to the present invention includes a glass group Material, a single-layer or multilayer antireflection film provided on the glass substrate,
A surface modified film using a coating composition containing an alkoxysilane compound having a perfluoropolyether group represented by the above general formula (1) on the antireflection film.

In order to solve the above-mentioned problems in the prior art, the present inventors conducted various investigations and found that a perfluoropolyether for an antireflection film such as silicon oxide formed on a glass substrate was used. It has been found that the surface treatment with a compound improves the friction and abrasion resistance or the stain resistance. However, it was concluded that the surface treatment with this compound was very effective, but the effect was significantly reduced by chemical stability, for example, by solvent treatment. Again, this is the SiO _{2 on the} surface
It is thought to be related to the interaction with

The inventors of the present invention have conducted further intensive studies. As a result, a display having an antireflection property is obtained by coating with an alkoxysilane compound having a perfluoropolyether group represented by the general formula (1). An attempt was made to solve the problem of abrasion resistance or contamination resistance of the surface of a device or the like. In other words, an alkoxysilane structure is included in the molecular structure in order to have an interaction with the SiO ₂ surface, and a strong bond is formed on the surface. Therefore, problems such as solvent resistance, which have been unsatisfactory in the past, can be overcome.

Accordingly, the coating composition containing the alkoxysilane compound having a perfluoropolyether group represented by the above formula (1) has properties such as abrasion resistance, stain resistance and solvent resistance on the surface of the antireflection film. Can be formed. In this case, by adding one or more selected from β-diketones such as an acid or base, a phosphate ester, and β-diketone such as acetylacetone to the coating composition as a catalyst for promoting the reaction with the base material,
Even if the heating temperature is lowered, a strong bond with the substrate can be formed.
Therefore, it is advantageous in terms of the manufacturing process, and it is possible to prevent deterioration of the surface modified film due to heating, and to form a high quality surface modified film.

It is generally known that an acid or a base is used as a catalyst when preparing a solution of the above alkoxysilane compound having a perfluoropolyether group. In the case of a thin film having a thickness of, for example, about 10 nm, tribological effects such as lubrication properties are not known. Furthermore, the effect of adding a phosphate ester catalyst or a β-diketone such as acetylacetone together with an acid or a base is not known. In a thin film material such as an anti-reflection filter, there is a severe demand for durability from the film thickness, and an attempt has been made to add such a catalyst in order to improve the durability.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments. FIG. 1 shows a sectional structure of a filter for a display device according to an embodiment of the present invention. FIG.
In the display device filter 10 shown in FIG. 1, an antireflection film 2 is provided on one surface of a glass substrate 1, and a surface modification film 3 is formed on this upper surface.

For example, the display device filter 10 is
It can be used by bonding to the panel 101 of the CRT 100 shown in FIG. The adhesive for bonding the filter 10 to the panel 101 is not particularly limited, and various known adhesives can be used. Generally, an ultraviolet curable resin-based adhesive is used, and the refractive index of the cured layer is It is preferable that the refractive index is close to the refractive index of the panel, for example, the difference is within 0.8%. Specifically, for example,
Bisphenol A type epoxy (meth) acrylate having a molecular weight of 550 or more 10% by weight, urethane (meth) acrylate 20% by weight, hydroxyl group-containing mono (meth) acrylate 70% by weight, photopolymerization initiator 3% and other additives about several% And the like.

Further, the filter 10 for a display device of the present invention.
May be a type of filter that is detachably attached to the front surface of the panel 101. In a case where the display device filter is detachably mounted, a frame is attached to an outer peripheral portion of the display device filter according to the present invention, and the display device filter according to the present invention is stretched over the frame. Become.

The display panel to which the filter 10 is attached or attached is not limited to a panel having a curvature such as a CRT, but may be a panel of a flat display such as a liquid crystal display or a plasma display. And panels of various display devices.

FIG. 2 is a perspective view also showing a cathode ray tube 100 as a display device of the present invention. FIG. 3 shows a cross-sectional structure of one embodiment of the panel 101 in this case.
In the display device 100 in this case, the antireflection film 2 is provided directly on the surface of a glass panel 101 of a CRT as a glass substrate, and the surface modification film 3 is provided on the surface of the antireflection film 2. .

The display device of the present invention is applicable to all display devices having a glass substrate on which an anti-reflection film is formed, and includes flat display devices such as liquid crystal displays and plasma displays in addition to CRTs. In the present invention, the glass substrates 1 and 101 shown in FIGS. 1 and 3 are not particularly limited, and may be any non-crystalline solid containing silicic acid, boric acid, phosphoric acid, or the like as a main component. Soda glass, lead glass, hard glass, quartz glass,
Liquid crystallized glass and the like (for example, Chemical Handbook Basic Edition, PT-537, The Chemical Society of Japan). As the CRT, silicate glass containing strontium or barium is preferably used, and in a liquid crystal display device, non-alkali glass is preferably used.

The anti-reflection film 2 formed on the glass substrate 1 has a single-layer or multi-layer structure, and various combinations are possible. In particular, in the case of a multilayer structure, the film configuration of the material forming the lower layer below the surface layer film may be appropriately tested according to required performances, such as heat resistance, antireflection property, reflected light color, durability, surface hardness, and the like. Can be determined based on the above.

Silicon dioxide for forming these antireflection films
Methods for forming various inorganic films, including, vacuum deposition,
Each type represented by ion plating and sputtering
There is a kind of PVD (Physical Vapor Deposition) method.
In order to obtain an anti-reflection film, an inorganic substance suitable for the above-mentioned PVD method
As SiO_TwoBesides, for example, Al_TwoO_Three, Zr
O_Two, TiO_Two, Ta_TwoO_Five, TaHf_Two, SiO, T
iO, Ti_TwoO_Three, HfO_Two, ZnO, In_TwoO_Three/ S
nO_Two, Y_TwoO _Three, Yb_TwoO_Three, Sb_TwoO_Three, MgO,
CeO_TwoAnd the like.

It is preferable that the outermost surface layer of the antireflection film formed by the PVD method is mainly composed of silicon dioxide. In the case other than silicon dioxide, not only sufficient surface hardness cannot be obtained, but also
This is because there is a possibility that the improvement of stain resistance and abrasion resistance, which are the object of the present invention, and the durability of these properties may not be remarkably exhibited. However, the present invention mainly relates to the configuration of the surface modified film covering the surface of such an antireflection film, and thus does not particularly limit the material of the outermost surface film of the antireflection film, It may be composed of something other than silicon dioxide.

The thickness of the outermost surface layer of the anti-reflection film should be determined according to the required performance other than the anti-reflection effect. It is preferable to select the optical film thickness of the surface layer to be １ ／ of the target light wavelength or an odd multiple thereof, from the viewpoint of giving a minimum reflectance, that is, a maximum transmittance.

On the other hand, the structure of the lower layer of the surface film is not particularly limited. That is, although it is possible to form the surface layer directly on the substrate, it is possible to form a film having a higher refractive index than the surface layer on the substrate in order to make the antireflection effect more remarkable. Coating is effective. Some proposals have also been made regarding the selection of the film thickness and the refractive index of these multilayer antireflection films (for example,
Optical Technology Contact Vol.9 No.8 p.17 (1971)).

It is also possible to provide an inorganic light transmitting film such as a carbon sputter film or a carbon CVD film in the lower part. In the present invention, the surface of the single-layer or multi-layer antireflection film 2 as described above is formed by the following general formula (1).
This is covered with a surface modified film 3 formed from a coating composition containing an alkoxysilane compound having a perfluoropolyether group represented by

R _f ｛COR ₁ —R ₂ —Si (OR ₃ ) ₃ ｝ _j (1) (where R _f is a perfluoropolyether group, R ₁ is a divalent atom or atomic group, R ₂ is an unsubstituted or substituted divalent hydrocarbon group, R ₃ is an unsubstituted or substituted monovalent hydrocarbon group, and j is 1 or 2.) Molecular structure of a perfluoropolyether group as R _f as it is not specifically limited, but include perfluoropolyether group of various chain lengths, preferably C ₁
A monovalent or divalent perfluoropolyether having a perfluoroalkyloxy group of about to C ₃ as a repeating unit. Specific examples of the monovalent perfluoropolyether include the following.

[0029]

Embedded image

Examples of the divalent perfluoropolyether group include the following.

[0031]

Embedded image

In the above chemical structural formula, l, m, n,
k, p and q each represent an integer of 1 or more. However, as described above, the molecular structure of the perfluoropolyether is not limited to those exemplified above.
The bonding atom or bonding atomic group as R ₁ in the general formula (1) is not particularly limited, but is usually an atom or an atomic group such as O, NH, and S.

R ₂ in the general formula (1) is an unsubstituted or substituted divalent hydrocarbon group, for example, an alkylene group such as a methylene group, an ethylene group, a propylene group or a butylene group. Not restricted. Also, R ₃
Is an unsubstituted or substituted monovalent hydrocarbon group constituting an alkoxy group, and the number of carbon atoms is not particularly limited. For example, about C _{1 to} C ₅ , for example, a methyl group, an ethyl group, and a propyl group And an alkyl group such as an isopropyl group. In the above R _{1 to} R ₃ , as long as the flexibility or the fluctuation property of the carbon atom chain is not impaired, the carbon atom chain may partially have a cyclic structure such as an unsaturated bond, a characteristic group, or an aromatic ring. Further, it may have a short-chain branched chain or a side chain.

The molecular weight of the alkoxy compound represented by the general formula (1) is not particularly limited, but is preferably 500 to 100 in terms of number average molecular weight from the viewpoints of stability, ease of handling and the like.
00, more preferably about 500-2000. Further, the thickness of the surface-modified film formed of such a compound is not particularly limited, either. 1 nm to 100 n
m, more preferably 10 nm or less, specifically 0.5
It is desirable that the thickness is about 5 nm to 5 nm.

As the coating method, various methods used in a normal coating operation can be applied. From the viewpoint of uniformity of the antireflection effect and control of the reflection interference color, spin coating, dipping coating,
Curtain flow coating and the like are preferably used. Further, from the viewpoint of workability, a method of impregnating a material such as paper or cloth with a liquid and performing coating and casting is also preferably used.

In such a coating operation, the compound represented by the general formula (1) is usually diluted in a volatile solvent and used as a coating composition. The solvent used is not particularly limited, but in consideration of the stability of the composition, the wettability of the outermost surface layer of the antireflection film to be coated, typically the silicon dioxide film, volatility, etc. Should be determined. In the present invention, particularly methanol, ethanol, isopropanol,
n-butyl alcohol, i-butyl alcohol, sec
Alcohol-based solvents such as -butyl alcohol and sec-amyl alcohol are preferred, and one of these can be used alone or as a mixture of two or more. It is also possible to mix a hydrocarbon solvent with an alcohol solvent to obtain a mixed solvent. Examples of such hydrocarbon solvents include paraffins such as n-hexane and n-heptane, aromatic hydrocarbons such as benzene and toluene, and cycloparaffins such as cyclohexane having a boiling point of 50 to 120 ° C.
Can be used alone or in combination of two or more. In addition, it is also possible to use a fluorinated hydrocarbon solvent, for example, perfluoroheptane, perfluorooctane, and trade name SV-1 manufactured by Autodimont.
10, perfluoropolyethers such as SV-135 and perfluoroalkanes such as FC series manufactured by Sumitomo 3M can be exemplified. Among these fluorinated hydrocarbon solvents, those having a boiling point in the range of 70 to 240 [deg.] C. are selected, and one of these can be used alone or in combination of two or more.

The degree of dilution with the diluting solvent in preparing the coating composition of the compound represented by the general formula (1) is not particularly limited.
It is appropriate to adjust the concentration to about 0.1 to 5.0% by weight. In the present invention, it is preferable to add an acid or a base as a reaction catalyst, if necessary, to the coating solution. As the acid catalyst, for example, sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, acid clay, iron oxide, boric acid, trifluoroacetic acid and the like can be used. As the base catalyst, sodium hydroxide, potassium hydroxide, lithium hydroxide and the like can be used. An alkali metal hydroxide or the like can be used. The addition amount of these catalysts is 0.001-1 mmol
/ L is preferred. In addition to these acids and bases, phosphate-based catalysts such as dilauryl phosphate, perfluoropolyether ester of phosphoric acid, and β-diketones such as acetylacetone can be added to enhance the catalytic effect. It is. By the addition of the catalyst as described above, the interaction involving the bonding reaction between the silano group of the compound represented by the general formula (1) and SiO ₂ on the surface of the antireflection film can be performed at a low temperature or without heating. Proceeds well. For this reason, it is possible to cause the formed surface modified film to react without giving an adverse effect such as deformation to SiO _2.
In the above-mentioned thin film material, excellent improvement in durability can be expected despite the strict requirements for durability due to its film thickness. The addition amount of such a phosphate ester or carbonyl compound is 0.1 to 100 mmol /
It can be about L. The drying temperature of the coating composition to which such a catalyst is added is preferably about 20 to 170 ° C.

In applying the coating composition containing the compound represented by the general formula (1) according to the present invention,
It is preferable that the surface of the antireflection film to be applied is cleaned, and at the time of cleaning, dirt removal with a surfactant, degreasing with an organic solvent, steam cleaning with a fluorine-based gas, or the like is applied. It is also an effective means to perform various pretreatments for the purpose of improving adhesion and durability, and particularly preferably used methods include activating gas treatment, chemical treatment with an acid, alkali, or the like.

The surface-modified film of the present invention can impart abrasion resistance to the surface of silicon oxide, in addition to stain resistance, scratch resistance, and processing resistance. Therefore, the filter for a display device on which the surface modified film of the present invention has been formed is less likely to be stained than a normal antireflection film, and the stain is less noticeable. Furthermore, it has the advantage that dirt can be easily removed, or the surface slides well, so that it is not easily scratched. In addition to these properties, it has durability with respect to abrasion.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention.

[0041]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. In the examples, "parts" indicates parts by weight.

Example 1 (1) Preparation of antireflection film A cathode ray tube surface was sputtered to a thickness of 130 nm.
Of ITO (tin oxide doped indium oxide, Indiumu Tin
Oxide), and SiO ₂ was deposited thereon to a thickness of 80 nm to form an antireflection film having two layers. (2) Preparation of a coating composition containing an alkoxysilane compound having a perfluoropolyether group: 4 parts of an alkoxysilane compound having a perfluoropolyether group (1) (molecular weight: about 850, compound 1 in Table 1) were added with methyl alcohol 200 parts were added and mixed, and 1 cc of acetylacetone and 0.01 ml of concentrated hydrochloric acid were further used as a catalyst.
After adding cc to make a uniform solution, the solution was further filtered with a membrane filter to obtain a coating composition. (3) Coating and drying The coating composition prepared in (2) was dip-coated on the surface of the antireflection film obtained in (1) at a pulling rate of 5 cm / min. After the application, it was dried at a temperature of 70 ° C. for 1 hour. (4) Performance Evaluation The performance of the obtained surface-modified film was evaluated by conducting a test according to the following method. Table 2 shows test results of the following evaluation items (a) to (e). In order to check the solvent resistance, the same test was performed again after washing with ethanol. Table 2 shows the obtained results.

(A) Stain resistance test 5 ml of tap water was dripped on the filter surface, left for 48 hours in an atmosphere of room temperature (25 ° C. ± 2 ° C.), and the remaining state of the scale after wiping with a cloth was visually observed. And observed. The case where scale was successfully removed was defined as good, and the case where scale was not removed was defined as poor.

(B) Surface Slipperiness The degree of hooking when the surface was scratched under a load of 300 g on the tip of a mechanical pencil was evaluated. The criteria are as follows. ：: Not caught at all.

Δ: If it is strengthened, it will be caught. X: Even if weakened, it is caught. (C) Abrasion resistance test The surface was made of steel wool # 0000 under a load of 200 g.
After rubbing 0 times, it was evaluated whether or not scratches were formed. The criteria are as follows.

：: Not attached at all. Δ: Fine scratches are formed. X: The scratch is remarkable. (D) Difficulty of attaching dirt The difficulty of attaching dirt was visually evaluated. The criteria are as follows.

A: Inconspicuous even if attached. Δ: attached, but easily removable. X: The appearance after attachment is conspicuous. (E) Contact angle The contact angle between water and methylene iodide was measured. The measurement is
This was performed using CA-A manufactured by Kyowa Interface Chemical Co., Ltd. The measured value of the contact angle is a measure of the residual ratio of the surface-modified film or the contamination with water or oil. Example 2 In the preparation of the coating composition containing an alkoxysilane compound having a perfluoropolyether group in Example 1, the same procedure was performed except that only hydrochloric acid was used without using acetylacetone as a catalyst. Table 2 shows the results. Example 3 In the preparation of the coating composition containing an alkoxysilane compound having a perfluoropolyether group in Example 1, ammonia water was used instead of hydrochloric acid as a catalyst.
The same procedure was performed except that acetylacetone and ammonia were used in combination. Table 2 shows the results. Example 4 In the preparation of the coating composition containing an alkoxysilane compound having a perfluoropolyether group in Example 1, the same procedure was performed except that dilauryl phosphate was used as a catalyst. Table 2 shows the results. Example 5 In the preparation of the coating composition containing an alkoxysilane compound having a perfluoropolyether group in Example 1, compound 2 (molecular weight: about 1000, alkoxy (Perfluoropolyether having a silano group) and the catalyst was a perfluoropolyether ester of phosphoric acid.
Table 2 shows the results. Comparative Example 1 In the preparation of the coating composition containing an alkoxysilane compound having a perfluoropolyether group in Example 1, the same procedure was carried out except that the coating composition was prepared without using a catalyst. Table 2 shows the results. Comparative Example 2 In the preparation of the coating composition containing an alkoxysilane compound having a perfluoropolyether group in Example 1, compound 2 (molecular weight: about 1,000, alkoxy (Perfluoropolyether having a silano group) and the preparation of the coating composition was carried out without using a catalyst. Table 2 shows the results. Comparative Example 3 The same procedure was performed except that the coating composition was not applied. Table 2 shows the results.

[0048]

[Table 1]

[0049]

[Table 2]

From the results shown in Table 2, when no catalyst was added to the coating composition (Comparative Examples 1 and 2), the characteristics of the surface-modified film, particularly, the difficulty of attaching the stain, were poor, and the surface-modified film was formed. When no film is formed (Comparative Example 3), properties such as abrasion resistance and surface slippage are clearly inferior. Examples 6 to 10 All of the procedures were performed in the same manner as in Example 1 except that the drying temperature after application of the coating composition was as shown in Table 3. The results are also shown in Table 3. At this time, the stain resistance, surface slippage, abrasion resistance test, and difficulty in attaching dirt were the same, and therefore, the description is omitted.

[0051]

[Table 3]

It is recognized that a surface modified film having good characteristics can be obtained even at a temperature close to room temperature. If the heating temperature exceeds 100 ° C., the properties are satisfactory. However, the heat capacity of the panel glass is large, so that the higher the temperature, the more difficult the heating becomes. In addition, thermal stress is applied to the antireflection film, and the film cracks. It is not preferable because it causes generation. Comparative Examples 4 to 8 All of the procedures were performed in the same manner as in Example 1 except that the coating composition was prepared without using the catalyst, and the drying temperature after application of the coating composition was set to the temperature shown in Table 4. The results are also shown in Table 4.

[0053]

[Table 4]

If no catalyst was added, a film having good characteristics could not be obtained even at 150 ° C., and it was recognized that the lower the heating temperature, the more pronounced the catalytic effect was.

[0055]

As described above, in the filter according to the present invention, the surface of the single-layer or multi-layer antireflection film provided on the glass substrate has a perfluoropolyether represented by the general formula (1). This is a display device filter coated with a surface-modified film made of an alkoxysilane compound having a group. Therefore, the filter according to the present invention and the display device having the same have the following effects. (1) It is hard to be stained by fingerprints, hand marks, and the like, and hardly noticeable. These effects are permanently maintained. (2) It can be easily removed even if it is dried due to adhesion of scale and the like. (3) Good surface slipperiness. (4) Dirt such as dust hardly adheres, and the usability is good. (5) There is durability against abrasion. (6) The drying temperature after application can be reduced to a low temperature of 50 ° C. or less.

Accordingly, the surface of the antireflection filter is coated with an alkoxysilane compound having a perfluoropolyether group, and then heated and dried, thereby having an effect of preventing contamination such as hand scales and scales, and an effect of the lubricant. As a result, it has become possible to provide an antireflection filter having excellent slipperiness and abrasion resistance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating one embodiment of an antireflection filter for a display device according to the present invention.

FIG. 2 is a perspective view of a cathode ray tube.

FIG. 3 is a cross-sectional view illustrating one embodiment of a filter portion of the display device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Glass base material, 2 ... Antireflection film, 3 ... Surface modification film, 1
0: filter, 100: cathode ray tube, 101: panel

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01J 29/88 G02B 1/10 A

Claims (7)

[Claims] A coating composition wherein the surface of a single-layer or multilayer antireflection film provided on a glass substrate contains an alkoxysilane compound having a perfluoropolyether group represented by the following general formula (1): A filter for a display device, wherein the filter is coated with a surface-modified film using a polymer. R _f ｛COR ₁ —R ₂ —Si (OR ₃ ) ₃ ｝ _j (1) (where R _f is a perfluoropolyether group, R ₁ is a divalent atom or atomic group, and R ₂ is A substituted or substituted divalent hydrocarbon group, R ₃ represents an unsubstituted or substituted monovalent hydrocarbon group, and j is 1 or 2.) 2. The method according to claim 1, wherein the coating composition comprises an acid or a base,
The display device filter according to claim 1, further comprising one or more catalysts selected from a phosphate ester and a β-diketone. 3. The display device filter according to claim 1, wherein the outermost surface of the antireflection film is mainly made of silicon oxide, and a surface modification film is formed on the surface. 4. A glass substrate, a single-layer or multilayer anti-reflection film provided on the glass substrate, and a perfluoropolyether group represented by the following general formula (1) on the anti-reflection film. And a surface modified film using a coating composition containing an alkoxysilane compound having the following formula: R _f ｛COR ₁ —R ₂ —Si (OR ₃ ) ₃ ｝ _j (1) (where R _f is a perfluoropolyether group, R ₁ is a divalent atom or atomic group, and R ₂ is A substituted or substituted divalent hydrocarbon group, R ₃ represents an unsubstituted or substituted monovalent hydrocarbon group, and j is 1 or 2.) 5. The method according to claim 1, wherein the coating composition comprises an acid or a base,
The display device according to claim 4, further comprising one or more catalysts selected from a phosphate ester and a β-diketone. 6. The display device according to claim 4, wherein the outermost surface of the antireflection film is mainly made of silicon oxide. 7. The display device according to claim 4, wherein the glass substrate is a glass panel of a cathode ray tube, and the display device is a cathode ray tube.