WO2006009065A1 - 反射防止膜及びそれを有する反射防止板 - Google Patents
反射防止膜及びそれを有する反射防止板 Download PDFInfo
- Publication number
- WO2006009065A1 WO2006009065A1 PCT/JP2005/013033 JP2005013033W WO2006009065A1 WO 2006009065 A1 WO2006009065 A1 WO 2006009065A1 JP 2005013033 W JP2005013033 W JP 2005013033W WO 2006009065 A1 WO2006009065 A1 WO 2006009065A1
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- Prior art keywords
- film
- refractive index
- antireflection
- antireflection film
- film thickness
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
Definitions
- Antireflection film and antireflection plate having the same
- the present invention relates to an antireflection film manufactured by coating a liquid material, and an antireflection plate having the antireflection film on at least one surface. More specifically, it is an antireflection film in which a low-refractive index film and a high-refractive index film are laminated by a wet coating method, and suppresses uneven color caused by partial film thickness fluctuations where the luminous reflectance is low.
- the present invention relates to an antireflection film and an antireflection plate having the antireflection film on at least one surface.
- the wet coating method has a low cost compared to the dry coating method.
- a coating material in a solution state is applied to a substrate such as a film, the solvent is dried and removed, and the resulting coating film is heated or applied.
- the film is cured by irradiating active energy rays to form a cured thin film, and an antireflection film comprising a plurality of cured thin films is produced by repeating these operations a plurality of times.
- the reflectance is lowered by utilizing the interference of light.
- the spectral reflectance at each wavelength of the visible light castle changes. Therefore, the color of the reflected light changes depending on the location, and the change is observed as color unevenness, resulting in deterioration of the appearance of the antireflection film.
- the film thickness is such that the reflectance is the lowest at the center wavelength of visible light (555 nm)
- even a slight film thickness variation is possible. There is a problem that color unevenness occurs and the appearance deteriorates.
- Patent Documents 1 to 4 are not preferable because the manufacturing cost of the antireflection film is increased and the material and operating conditions are restricted. In addition, it has been very difficult to achieve a level of film thickness fluctuation ( ⁇ 1% or less) sufficient to suppress color unevenness by either technique.
- Patent Document 5 by defining the refractive index of each layer in a dielectric multilayer film composed of four layers, the influence on the antireflection performance can be suppressed even when the film thickness of each layer varies.
- this multilayer film is manufactured by a so-called dry coating method, and it is difficult to manufacture an equivalent film by a wet coating method. Even if it can be manufactured, it is clear that the number of layers is large and disadvantageous in terms of cost. In other words, the present situation is that obtaining an antireflection film satisfying both performance and cost has not been realized so far.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-39014
- Patent Document 2 JP 2003-93963 A
- Patent Document 3 Japanese Unexamined Patent Publication No. 2003-126768
- Patent Document 4 Japanese Patent Laid-Open No. 2003-93953
- Patent Document 5 JP-A-5-249303
- the present invention provides an antireflection film capable of suppressing deterioration of the appearance even when the film thickness of the coating film changes when the wet coating method is used, and an antireflection film using the antireflection film The purpose is to provide a board.
- FIG. 1 is a diagram showing a film thickness range that satisfies the expressions (3) and (4).
- FIG. 2 is a diagram showing a range of film thicknesses satisfying the expressions (5) and (6), and the expressions (5 ′) and (6 ′).
- the present invention is an antireflection film including two layers sequentially laminated by a wet coating method, and is used for suppressing reflection of external light.
- the color difference ( ⁇ ⁇ *) obtained from any two different surface reflectances is 2 in order to suppress the occurrence of color unevenness and appearance deterioration, with a visual reflectance of 2.0% or less.
- the object is an antireflection film that is 0 or less, and an antireflection plate having this antireflection film on at least one surface of a substrate.
- the luminous reflectance is the reflectance sensitivity determined in consideration of the sensitivity to the wavelength of the human eye, and is obtained by the method of JIS Z 8701 based on the spectral reflectance.
- the preferable luminous reflectance is 1.7% or less.
- the lower limit of the apparent reflectance is actually 0.1% or more, preferably 0.5% or more, due to material limitations.
- the color difference ( ⁇ ⁇ *) is an index that expresses the difference in color of reflected light, and is an index that expresses the difference in color of reflected light obtained by the method of JIS Z 8729 from the spectral reflectance of two different points. is there.
- a preferable color difference ( ⁇ *) is 1.5 or less.
- the antireflection film of the present invention is produced by a wet coating method in order to reduce production costs.
- the coating method to be used is not particularly limited, but in order to obtain the effects of the present invention, it is preferable that the variation in film thickness is ⁇ 5% or less.
- a method, a datebing method, or the like is preferably used.
- the antireflection film of the present invention is subjected to antifouling treatment using various surface treatment agents such as silicone-based or fluorine-based surface treatment agents within a range in which the refractive index of the surface layer does not substantially change.
- various surface treatment agents such as silicone-based or fluorine-based surface treatment agents within a range in which the refractive index of the surface layer does not substantially change.
- Water repellent treatment or the like may be performed.
- the antireflection plate of the present invention comprises the above antireflection film of the present invention on at least one surface of a substrate. Have.
- the two antireflection films may be the same or may have different refractive indexes and different film thickness configurations.
- a transparent resin board, a transparent resin film, a glass plate, or the like can be used, for example, as long as it is a transparent plate or film.
- the transparent resin include (meth) acrylate resin, polycarbonate resin, polyester resin, single cell resin, styrene resin, methyl methacrylate-styrene random copolymer resin, and the like. be able to.
- the nD of the base material is preferably 1.48 to: L 60.
- the refractive index has wavelength dependence (dispersion), Since reflectance of wavelengths in the range of 550 to 600 nm is regarded as important, nD is a representative value.
- a thick film layer having a thickness of 1 m or more on the substrate
- two layers may be laminated by a wet coating method.
- This thick film layer can be used as a hard coat layer or a conductivity providing layer.
- Such a thick film layer is, for example, a resin layer obtained by polymerizing and curing a raw material containing a polyfunctional monomer as a main component.
- the main component of the resin is a urethane-modified (meth) acryl oligomer, a polyfunctional monomer.
- a polyfunctional polymer containing two or more alicyclic groups and methacryloyl groups such as polyether (meth) acrylic acid ester, poly (meth) acrylic acid, and the like is polymerized and cured by active energy rays.
- examples thereof include cocoa butter or rosin obtained by crosslinking and curing a silicone-based, melamine-based, or epoxy-based material by heat.
- the thick film layer formed on the base material can be regarded as optically integral with the base material.
- the nD of the thick film layer is preferably in the range of 1.48 to L60.
- the material constituting the surface layer is a thermosetting type or active energy ray hardened material.
- a silicone-based resin a fluorinated silicone-based resin, an acrylate-based resin, and combinations thereof can be used.
- a metal oxide fine particle is added to a thermosetting or active energy ray curable resin.
- urethane acrylate resin titanium oxide, zirconium oxide, ITO, etc.
- rosin to which fine particles are added is used.
- nH and nL are represented by the following formulas (1) and (2)
- This refractive index range is more preferably considering the adhesion between layers and the mechanical strength of the film.
- the antireflection film of the present invention is a?
- the visual reflectance is 2.0% or less, and the surface reflectance power at two different points is characterized by a color difference ( ⁇ *) of 2.0 or less.
- the method for obtaining such an antireflection film is not particularly limited.
- the film thicknesses of the low refractive index film and the high refractive index film are both measured with respect to the reflectance and the color unevenness when the film thickness varies. It can be easily obtained by designing in consideration of the above.
- the sensitivity of the eye is taken into consideration, and the reflectance is the lowest at the center wavelength of visible light (555 nm), that is, the reflection spectrum.
- the film thickness is designed so that the V is V-shaped.
- the reflectance on the short wavelength side and the long wavelength side of visible light greatly changes, resulting in color unevenness.
- the film thickness is selected appropriately, the reflection spectrum can be made such that the color difference of the reflected light does not increase in the visible light range, and the film thickness is reduced while keeping the reflectance low. Even if there is a fluctuation around the design, it is possible to suppress the occurrence of color unevenness.
- the dH and dL are the following formulas (5) and (6)
- the above-mentioned design depends on the magnitude of film thickness variation and the desired luminous reflectance, reflected color, and transmitted color. It is possible to select the film thickness from the range.
- an antireflection plate (substrate Z antireflection film (high refractive index layer Z low refractive index layer)) was produced according to the operation described below.
- the bar coater that can be applied so that the average value of the film thickness is the same as the designed film thickness was selected as the target value of the designed film thickness shown in the following examples and comparative examples.
- a 2 mm thick methyl metatalylate-styrene random copolymer resin board is used as a base material.
- An antireflection plate with a substrate was prepared by forming two thin film layers (a high refractive index layer and a low refractive index layer in this order from the substrate side) on one side.
- EI-3 coating solution (containing ITO fine particles and uretan-modified attalylate resin) manufactured by Dainippon Paint Co., Ltd. was diluted with 2-butanone to a solid content concentration of 3.0%. Then, a coating solution for forming a high refractive index layer was prepared, and this coating solution was applied to one side of a substrate using a bar coater, dried with hot air at 70 ° C for 1 minute, and then under the condition of 120 mjZcm 2 A high refractive index layer was formed by curing by irradiating with ultraviolet rays.
- a low refractive index layer was formed by diluting Opster JTA112 coating solution (containing fluorinated silicone resin) from JSR Corporation with 4-methyl-2-pentanone to a solid content concentration of 3.0%.
- a coating solution was prepared, and this coating solution was applied onto the high refractive index layer using a bar coater, dried with hot air under predetermined conditions and cured to form a low refractive index layer.
- an antireflection plate composed of the substrate Z antireflection film (high refractive index layer Z low refractive index layer) was obtained.
- the refractive index nD of each layer of the antireflection pair at a wavelength of 587.6 nm measured using an Abbe refractometer was as follows.
- low refractive index layer Z high refractive index layer thickness 100nm Zl50nm is applied as the design film thickness, and low refractive index layer
- the coating solution of the forming coating solution was dried with hot air at 80 ° C. for 30 minutes to remove the solvent, and an antireflection plate was obtained.
- An antireflection plate was obtained by repeating the same operation as in Example 1 except that the drying condition of the coating film for the layer forming coating solution was hot air drying at 50 ° C. for 60 minutes.
- An antireflection plate was obtained by repeating the same operation as in Example 1, except that the coating condition of the coating solution for forming a low refractive index layer was hot air drying at 50 ° C. for 60 minutes.
- Low Refractive Index Layer Z High Refractive Index Layer Thickness 95nm Z85nm is the designed film thickness, except that the coating condition of the coating liquid for forming the low refractive index layer is dry at 25 ° C for 90 minutes. By repeating the same operation as in Example 1, an antireflection plate was obtained.
- the refractive index of the medium refractive index layer is 1.70
- the refractive index of the high refractive index layer is 1.85
- the low refractive index is Materials with a refractive index of 1.45 were deposited with designed film thicknesses of 90 nm, 66 nm, and 95 nm, respectively, to obtain an antireflection plate.
- an 80 ⁇ m-thick cellulose triacetate film Co-catac K C8UX2MW, refractive index 1.49, degree of substitution of acetyl group 2.88
- the coating layer forming composition was applied to a dry film thickness of 3.5 / zm, dried at 80 ° C for 1 minute, and then cured by irradiating with ultraviolet rays at 200 mjZcm 2 for hard coating. A layer was formed to produce a hard coat film.
- the composition M for forming a medium refractive index layer in Table 3 was applied with an extrusion coater, dried at 80 ° C. for 2 minutes, and then irradiated with ultraviolet rays at 200 miZcm 2. Irradiated and cured to form a medium refractive index layer.
- the average refractive index layer had an average film thickness of 90 nm and a refractive index of 1.70.
- the composition H for forming a high refractive index layer shown in Table 4 was applied with an extrusion coater, dried at 80 ° C for 5 minutes, and then irradiated with ultraviolet rays under conditions of 200 mjZcm 2. Irradiated and cured to form a high refractive index layer.
- the thickness of this high refractive index layer is 66 nm and the refractive index is 1.85 o
- the composition L for forming a low refractive index layer in Table 5 was applied with an extrusion coater, dried at 80 ° C for 2 minutes, and further 120 ° C. And then cured by irradiating with ultraviolet rays under the condition of 200 mjZcm 2 to form a low refractive index layer.
- This low refractive index layer had a thickness of 95 nm and a refractive index of 1.45.
- the reflection color at each measurement point was calculated according to the methods of JIS Z 8701 and JIS Z 8729.
- the maximum ⁇ It was defined as a measure of color unevenness in the invention.
- ⁇ * calculated from the average value of the color coordinates of all measurement points and the color coordinates of each point, but this method hardly reflects the actual color unevenness.
- the physical film thickness (unit: nm) of each layer of the antireflection film is set to dH and dL in the order of lamination, and the combination of film thickness and film thickness variation of Example and Comparative Example, luminous reflectance, ⁇ *, Table 6 shows the evaluation of color unevenness. [0054] [Table 6]
- Comparative Example 6 is a 90 nm thick medium refractive index 3 3 bladder 3 ⁇ configuration 0) Reflective stasis bladder
- Example 1 and Comparative Example 1 the color variation is very conspicuous in Comparative Example 1 in which the film thickness variation is as large as ⁇ 4 nm, whereas in Example 1, the color unevenness is It didn't stand out. Even when the film thickness variation is as small as ⁇ 2 nm as in Example 2 and Comparative Example 2, color unevenness is noticeable in Comparative Example 2, whereas in Example 2, the luminous reflectance is The color unevenness could be suppressed until now. By the way, it has the same film thickness configuration as Comparative Example 2. When the film thickness fluctuation is even smaller as in Example 6, it is difficult to reproduce because the restrictions on the coating conditions and the composition of the coating liquid used are large. However, the uneven color became inconspicuous.
- Example 3 when the variation in film thickness was small compared to Example 1, the color unevenness could be further reduced.
- the film thickness variation is the same as in Example 2 and Example 3, but color unevenness is conspicuous, which is not preferable.
- Comparative Example 4 the color unevenness is not noticeable, but is not preferable because the luminous reflectance is high.
- Comparative Example 5 is not preferable because both the luminous reflectance and the color unevenness are large.
- the luminous reflectance is as low as 0.7%, but the color unevenness is conspicuously unfavorable even though the film thickness variation is relatively as small as ⁇ 1.5 nm.
- the configuration is realized with three layers of thin films, which is disadvantageous in terms of the number of coatings and the material.
- the antireflection film of the present invention causes color unevenness due to partial film thickness fluctuations with low luminous reflectance. It is hard to live. Therefore, the antireflection plate having the antireflection film of the present invention can be suitably used for various display front plates and the like.
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Surface Treatment Of Optical Elements (AREA)
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Abstract
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Applications Claiming Priority (2)
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JP2004213461 | 2004-07-21 | ||
JP2004-213461 | 2004-07-21 |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011090126A (ja) * | 2009-10-22 | 2011-05-06 | Toray Advanced Film Co Ltd | 反射防止フィルムの反射防止膜の反射色分布の測定方法、反射防止フィルムの製造方法、及び反射防止フィルム |
JP2013228741A (ja) * | 2008-07-22 | 2013-11-07 | Fujifilm Corp | 反射防止フィルム、偏光板、及び画像表示装置 |
CN111948744A (zh) * | 2015-11-20 | 2020-11-17 | Agc株式会社 | 带膜的弯曲基材及其制造方法以及图像显示装置 |
US20200408954A1 (en) * | 2018-03-02 | 2020-12-31 | Corning Incorporated | Anti-reflective coatings and articles and methods of forming the same |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002116303A (ja) * | 2000-07-27 | 2002-04-19 | Asahi Glass Co Ltd | 反射防止膜付き基体とその製造方法 |
JP2002296405A (ja) * | 2001-03-29 | 2002-10-09 | Sumitomo Chem Co Ltd | 反射干渉色とその色ムラの少ない反射防止基材 |
-
2005
- 2005-07-14 WO PCT/JP2005/013033 patent/WO2006009065A1/ja not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002116303A (ja) * | 2000-07-27 | 2002-04-19 | Asahi Glass Co Ltd | 反射防止膜付き基体とその製造方法 |
JP2002296405A (ja) * | 2001-03-29 | 2002-10-09 | Sumitomo Chem Co Ltd | 反射干渉色とその色ムラの少ない反射防止基材 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013228741A (ja) * | 2008-07-22 | 2013-11-07 | Fujifilm Corp | 反射防止フィルム、偏光板、及び画像表示装置 |
US9279913B2 (en) | 2008-07-22 | 2016-03-08 | Fujifilm Corporation | Antireflective film, polarizing plate, and image display device |
JP2011090126A (ja) * | 2009-10-22 | 2011-05-06 | Toray Advanced Film Co Ltd | 反射防止フィルムの反射防止膜の反射色分布の測定方法、反射防止フィルムの製造方法、及び反射防止フィルム |
CN111948744A (zh) * | 2015-11-20 | 2020-11-17 | Agc株式会社 | 带膜的弯曲基材及其制造方法以及图像显示装置 |
US20200408954A1 (en) * | 2018-03-02 | 2020-12-31 | Corning Incorporated | Anti-reflective coatings and articles and methods of forming the same |
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