JP2009294329A - Antireflection film and front filter for display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antireflection film having antireflection performance excellent in light resistance and a front filter for a display using the same even when an ultraviolet curable resin that absorbs ultraviolet rays and cures by the action thereof is used. .
SOLUTION: At least a metal oxide, an ultraviolet curable resin, and an ultraviolet absorber are included, the amount of the metal oxide is 40 to 300 weight percent with respect to the ultraviolet curable resin, and the amount of the ultraviolet absorber is an ultraviolet curable type. An antireflection layer including a layer (A) having a thickness of 0.5 to 2 μm prepared by applying, drying and curing a coating of 20 to 40 weight percent with respect to the resin is one of the main components of the translucent substrate. Antireflection film provided on the surface.
[Selection figure] None

Description

  The present invention relates to an antireflection film provided with an antireflection layer having excellent light resistance.

  In recent years, development of high-definition and large-screen displays typified by liquid crystal displays and plasma display panels (PDP) has been rapidly progressing. In order to improve the visibility of the display surface of the display, it is necessary to dispose an antireflection layer having an antireflection function on the surface in order to prevent reflection of external light such as a fluorescent lamp on the screen.

  The antireflection layer is formed by depositing or sputtering an inorganic metal on the display surface, so-called dry coating method, and a material having a refractive index as required, such as a high refractive index material, a medium refractive index material, or a low refractive index material. Known is a wet coating method in which each is applied to a substrate in a liquid form such as a solution or dispersion, dried, and cured as necessary. With the recent increase in size of displays, the so-called Roll-to-Roll, which continuously manufactures an antireflection film using a roll, is becoming a mainstream wet coating method that is inexpensive and easily accommodates an increase in size.

  Also, in the wet coating method, it is the mainstream to use an ultraviolet curable resin because of its efficiency.

  As an antireflection layer, there are many combinations in which a high refractive index layer is provided on a substrate and a low refractive index layer is further provided thereon. In order to further improve the performance of the antireflection layer, for example, the first layer, the second layer, the third layer, and the fourth layer are sequentially formed from the lower layers of the plurality of layers constituting the antireflection layer. When the refractive indexes of n1, n2, n3, and n4 are n4 <n1 <n2 <n3, the number of layers is increased or the number of types of refractive indexes of each layer is increased. Usually, the uppermost layer of the plurality of layers constituting the antireflection layer is generally a low refractive index layer having the smallest refractive index, and the layer closer to the substrate is usually thicker than the other layers. In general, the hard coat layer is made larger. Since the antireflective layer has a limited refractive index obtained only with an organic resin, a metal oxide is often contained for adjusting the refractive index. Moreover, in order to prevent charging, conductive fine particles are mixed. For example, a metal oxide is added to the above-mentioned second layer to obtain a desired refractive index and antistatic ability, and the antireflection layer has a three-layer structure of a hard coat layer, a high refractive index antistatic layer, and a low refractive index layer. It is common. In addition, a metal oxide is added to the above-mentioned layer close to the base material to obtain a desired refractive index and antistatic ability, and the antireflection layer is composed of two layers, a high refractive index antistatic hard coat layer and a low refractive index layer. It is also common to have a structure.

That is, adjusting the content of the metal oxide was a means for ensuring antireflection performance.
Patent 3606464 JP2001-350001 Patent 3718031

  The display is used in various places, but may be used in a place where it is exposed to sunlight. Furthermore, with the recent increase in size, the possibility of being exposed to sunlight has further increased. However, antireflective films using UV curable resins, which have been the mainstream in recent years, react with the unreacted UV curable resin contained in the composition when exposed to sunlight, and the antireflection performance deteriorates (reflection spectrum). In some cases, the coating film may be cracked, whitened, or peeled off. In addition, as the amount of the metal oxide added for adjusting the refractive index and providing the antistatic performance increases, the deterioration of the antireflection performance becomes remarkable. The deterioration of the resin coating film containing the metal oxide is more remarkable than the resin coating film alone. This mechanism is currently unknown. However, in order to obtain the antireflection performance required in recent years, it is difficult to achieve this without adding a metal oxide to a specific layer. As a result of studies by the present inventors, at present, an antireflection film having a resin coating film containing a metal oxide has not been observed even after its light resistance test. Not hit.

  The present invention provides an antireflection film having an antireflection performance excellent in light resistance and a front filter for a display using the same even when an ultraviolet curable resin that absorbs ultraviolet rays and is cured by the action thereof is used. The purpose is to do.

  That is, the antireflection film of the present invention is as follows.

(1) It contains at least a metal oxide, an ultraviolet curable resin, and an ultraviolet absorber, and the amount of the metal oxide is 40 to 300 weight percent with respect to the ultraviolet curable resin;
An antireflection layer comprising a layer (A) having a thickness of 0.5 to 2 μm prepared by applying, drying and curing a paint having an ultraviolet absorber amount of 20 to 40 weight percent with respect to the ultraviolet curable resin, An antireflection film provided on one main surface of the translucent substrate.

  (2) In the antireflection film as described in (1) above, the paint containing at least the metal oxide, the ultraviolet curable resin, and the ultraviolet absorber further converts the hindered amine light stabilizer into an ultraviolet curable resin. It is preferably a paint containing 1 to 5 weight percent.

  (3) In the antireflection film according to any one of (1) and (2), the ultraviolet absorber is preferably a hydroxyphenyltriazine compound.

(4) In the antireflection film described in any one of the above items (1) to (3), a storage test in which light having a wavelength of 340 nm is irradiated on the film surface with an intensity of 0.77 W / m ² is performed for 500 hours. In this case, it is preferable that the visibility reflectance increase is 0.3% or less and the haze value increase is 0.5 or less before and after the test.

  (5) In the antireflection film described in any one of (1) to (4), a layer having a refractive index lower than that of the layer (A) is 80 nm to 130 nm. It is preferable to be provided.

  The display front filter of the present invention is as follows.

  (6) A front filter for a display, wherein the antireflection film described in any one of (1) to (5) is disposed on a substrate.

  ADVANTAGE OF THE INVENTION According to this invention, the production efficiency is good using an ultraviolet curable resin, the antireflection film which has the antireflection performance excellent in light resistance, and the front filter for displays using the same can be provided.

  In order to prevent the coating film from being deteriorated by sunlight (ultraviolet rays), an ultraviolet absorber (UVA), a light stabilizer, an antioxidant, and a peroxide decomposing agent are effective. In particular, the effects of UVA and hindered amine light stabilizer (HALS) are high, and the combination of these is more preferable.

  Examples of ultraviolet absorbers include hydroxyphenyl triazines and benzotriazoles.

As hydroxyphenyltriazine UVA,
2- [4-[(2-hydroxy-3-dodecyloxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine,
2- [4-[(2-Hydroxy-3- (2′-ethyl) hexyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5- Triazine,
2,4-Bis- (2-hydroxy-4-butyroxyphenyl) -6- (2,4-bis-butyroxyphenyl) -1,3,5-triazine,
Etc.

As the benzotriazole UVA, 2- (2-hydroxy-5-tert-butylphenyl) -2H-benzotriazole,
2- (2H-benzotriazol-2-yl) -4,6-bis (1-methyl-1-phenylethyl) phenol,
Octyl-3- [3-tert-butyl-4-hydroxy-5- (5-chloro-2H-benzotriazol-2-yl) phenyl] propionate,
2- (2H-benzotriazol-2-yl) -6- (1-methyl-1-phenylethyl) -4- (1,1,3,3-tetramethylbutyl) phenol, and the like.

  Among the above, it is particularly preferable to use hydroxyphenyltriazine-based UVA. Hydroxyphenyltriazine-based ultraviolet absorbers have an absorption spectrum shifted to a shorter wavelength side than benzotriazole-based compound ultraviolet absorbers, and have a spectrum that strongly absorbs light with a high energy wavelength (around 300 nm). This shift is preferable because the ultraviolet curable paint can be cured without causing significant curing inhibition.

HALS includes 2,4-bis [N-butyl-N- (1-cyclohexyl-2,2,6,6-tetramethylpiperidin-4-yl) amino] -6- (2-hydroxyethylamine) -1 , 3,5-triazine,
Bis (1,2,2,6,6-pentamethyl-4-piperidinyl)-[[3,5-bis (1,1-dimethyl) -4-hydroxyphenyl] methyl] butyl malonate, and the like.

The above UVA and HALS are examples, and are not limited thereto.
Various kinds of UVA and HALS in the coating film can be used as described above. Each of these may be used alone, but a combination of UVA and HALS is preferred because it increases the effect.

  The content ratio of UVA and HALS in the coating layer is the type of UVA and HALS used, the type of material constituting the coating film, the film configuration of the optical film having the antireflection function, the use of the optical film having the antireflection function, etc. However, if the usage rate is too low, the desired light deterioration suppression effect tends to be hardly exhibited, and if it is too high, the strength of the coating tends to decrease. The UVA content is preferably 20 to 40 weight percent and the HALS content is preferably 1 to 5 weight percent relative to the ultraviolet curable resin.

  As the ultraviolet curable resin, various ultraviolet curable resins conventionally used for forming an antireflection layer (including a hard coat layer) of this type of antireflection film can be used. More specifically, a monomer, prepolymer, or polymer having a vinyl group, a (meth) acryloyl group, an epoxy group, or an oxetanyl group can be used as the reactive functional group. In the above, the (meth) acryloyl group means an acryloyl group and / or a methacryloyl group. These can be used alone or in combination of two or more. Furthermore, when there are many bonding groups and functional groups that form hydrogen bonds in the molecule, the adhesion to the substrate is improved. These ultraviolet curable resins may be used in appropriate amounts depending on the type of material used and the amount of other materials used. The proportion of the ultraviolet curable resin contained in the layer (A) of the present invention is generally difficult to define, but if it is shown as a rough guide, it is 25 to 70 weight percent with respect to the weight of the antireflection layer to be formed. It is preferable to use within a range.

  From the viewpoint of improving the scratch resistance, the ultraviolet curable resin preferably contains a polyfunctional acrylate having two or more polymerizable unsaturated groups.

  Examples of the polyfunctional acrylic compound having two or more unsaturated groups include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, 1,4-cyclohexane diacrylate, Pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolethane tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) Acrylate, dipentaerythritol hexa (meth) acrylate, 1,2,3-cyclohexanetrimethacrylate, polyurethane polyacrylate, polyester polyacrylate Esters produced from polyhydric alcohol and (meth) acrylic acid such as relate, vinylbenzene such as 1,4-divinylbenzene, 4-vinylbenzoic acid-2-acryloylethyl ester, 1,4-divinylcyclohexanone And derivatives thereof. These may be used alone or in combination of two or more. Of these, at least one selected from pentaerythritol triacrylate and dipentaerythritol hexaacrylate is preferable from the viewpoint of further improving the scratch resistance. Pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolethane tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) The acrylate and dipentaerythritol hexa (meth) acrylate are preferable from the viewpoint of increasing the film strength. In the above description, “... (Meth) acryl ...” means “... acrylic ...” and / or “... methacryl ...”.

Examples of the metal oxide used in the present invention include zirconium oxide (ZrO ₂ ), titanium dioxide (TiO ₂ ), antimony-tin oxide (ATO), indium-tin oxide (ITO), and phosphorus-tin oxide. (PTO), zinc oxide (ZnO), tin oxide (SnO ₂ ), zinc antimonate (ZnSb ₂ O ₆ ), and the like. The metal oxide is preferably in the form of fine particles, and the primary particle diameter is preferably 100 nm or less, more preferably 50 nm or less, and particularly preferably 20 nm or less. This is because dispersibility in the ultraviolet curable resin is improved within this range.

  The ratio of the metal oxide contained in the layer (A) of the present invention differs depending on the type of metal oxide used, the desired refractive index, etc. What is necessary is just to use suitably in the range of -300 weight%. When the content of the metal oxide is less than 40 weight percent, the refractive index of the layer is less likely to be a large difference compared to the case where the metal oxide is contained, and furthermore, when the conductive metal oxide is used. In many cases, the intended conductivity is not exhibited. On the other hand, if it is 300 weight percent or more, the amount of resin is small and the coating film strength is insufficient.

  When ultraviolet irradiation is performed when the ultraviolet curable resin contained in the layer (A) is cured, a photopolymerization initiator is added to the coating solution for the layer. Photopolymerization initiators include acetophenones, benzophenones, ketals, anthraquinones, thioxanthones, azo compounds, peroxides, 2,3-dialkyldione compounds, disulfide compounds, thiuram compounds, fluoroamine compounds Etc. are used. These can be used alone or in combination of two or more. Usually, the amount of the photopolymerization initiator used is preferably about 1 to 15% by weight based on the weight of the ultraviolet curable resin to be used.

  As other components of the composition forming the layer (A), additives such as a dispersant, a surfactant, and a leveling agent may be added. Moreover, as long as it is made to dry after film-forming by the wet coating method, arbitrary amounts of solvents can be added.

  The method for forming the layer (A) on the substrate is not particularly limited. For example, a coating method such as roll coating, die coating, air knife coating, blade coating, reverse coating, gravure coating, or gravure printing, screen printing. Printing methods such as offset printing and ink jet printing can be used.

  The film thickness of the layer (A) needs to be 0.5 to 2 μm, and if it is less than 0.5 μm, the amount of the ultraviolet absorber is smaller than the absolute amount of the ultraviolet ray that hits the coating film even if the ultraviolet absorber is contained. The amount of ultraviolet rays cannot be sufficiently absorbed, and deterioration of the coating film cannot be suppressed. On the other hand, when the film thickness is greater than 2 μm, the amount of the ultraviolet absorber is larger than the absolute amount of the ultraviolet ray that hits the coating film, and the light is absorbed by the upper part of the film and does not reach the bottom. When the light resistance test is performed in this state, deterioration occurs from this hardened portion. In addition, the thickness in the above range is also necessary in order to exhibit scratch resistance and to function as a hard coat layer.

  If the translucent base material used by this invention is a material which has translucency, the shape, a manufacturing method, etc. will not be specifically limited. For example, polyester resin, polycarbonate resin, polyacrylate resin, alicyclic polyolefin resin, polystyrene resin, polyvinyl chloride resin, polyvinyl acetate resin, polyethersulfone resin, triacetyl cellulose What processed materials, such as resin, in the shape of a film or a sheet can be used. Examples of the method for processing into a film or sheet include extrusion molding, calendar molding, compression molding, injection molding, and a method in which the above resin is dissolved in a solvent and cast. The thickness of the substrate is usually about 10 μm to 500 μm. Note that additives such as an antioxidant, a flame retardant, a heat resistance inhibitor, an ultraviolet absorber, a lubricant, and an antistatic agent may be added to the material. Moreover, you may provide a primer layer (easy-adhesion layer) in this base film for the purpose of improving adhesiveness with the layer provided in the upper layer.

  The outermost layer of the antireflection layer provided on the antireflection film of the present invention is a low refractive index layer.

  The coating material for forming the low refractive index layer may be adjusted by combining the following ultraviolet curable resin, low refractive index fine particles, photoinitiator, and solvent. You may use what was done. In order to adjust the low-refractive-layer coating material using the following components, it may be dispersed according to a general method for adjusting the coating liquid.

  As a material for forming the low refractive index layer, a publicly known material for forming a low refractive index layer that is generally used may be used. For example, a coating solution containing low refractive index inorganic fine particles such as silica or magnesium fluoride having voids and a binder resin forming material, or a coating solution containing a fluorine-based resin or the like can be used.

  As the binder resin forming material for forming the low refractive index layer, a monomer having a vinyl group, a (meth) acryloyl group, an epoxy group or an oxetanyl group, a prepolymer thereof, a polymer ultraviolet curable resin can be used. .

  When UV irradiation is performed when the UV curable resin contained in the low refractive index layer is cured, a photopolymerization initiator is added to the coating solution for the low refractive index layer. The photopolymerization initiator can be appropriately selected from those preferably used for the layer. These can be used alone or in combination of two or more. Usually, the amount of the photopolymerization initiator used is preferably about 1 to 15 percent by weight based on the weight of the ultraviolet curable resin to be used.

  The method for forming the low refractive index layer is not particularly limited. For example, a coating method such as roll coating, die coating, air knife coating, blade coating, reverse coating, gravure coating, or gravure printing, screen is applied on an appropriate layer. It can be formed using printing methods such as printing, offset printing, and ink jet printing.

  When the antireflection layer is composed of multiple layers, the components affecting the refractive index may be appropriately adjusted and used according to the target refractive index of each layer as described above, and others are described above. The layer may be formed by the same method using the same ultraviolet curable resin and the necessary additives as described above.

  In any case, a layer close to the substrate of the antireflection layer is constituted by the layer (A), and this layer is usually a layer that can also function as a hard coat layer. Further, the uppermost layer of the antireflection layer is formed with a low refractive index layer as described above.

  An ultraviolet absorber or a hindered amine light stabilizer may be added to the layers other than the layer (A) in the antireflection layer as long as the function of the present invention is not impaired. Since it is usually designed to be much thinner than the layer (A), the effect of adding these is often not sufficiently exhibited, and it is not necessary to add these from the economical viewpoint. That is, the film thickness of the antireflection layer other than the layer (A) is the optical film thickness nd = λ / 4 (λ: human), which is the product of the refractive index n of the antireflection layer and the film thickness d of the layer. If the wavelength is set to a wavelength of 550 nm, which is highly visible to human eyes, the reflectance will be lower. The typical film thickness d is preferably set to be in the vicinity of λ / 4n. In this case, for example, since the refractive index of the low refractive index layer described above is preferably set to 1.30 to 1.50, it varies depending on the refractive index of the low refractive index layer and which visible light wavelength is selected. Although the optical film thickness cannot be generally defined, the optical film thickness is usually in the range of about 120 nm to 150 nm. Therefore, since the specific film thickness of these layers is usually designed to be much thinner than the layer (A) of the antireflection layer, an ultraviolet absorber or a hindered amine light stabilizer is added. However, it is not very efficient from the viewpoint of improving light resistance.

  Further, the antireflection film of the present invention may further include other layers as long as the function as the antireflection film of the present invention is not impaired. For example, a near-infrared absorbing layer may be further provided on the surface opposite to the surface of the translucent substrate on which a primer layer (easy adhesion layer) is provided on the surface of the translucent substrate or an antireflection layer is laminated.

  The antireflection film of the present invention as described above is used by being provided on the front surface of, for example, a plasma display panel (PDP) or a liquid crystal display that is used as a display panel of various electronic devices including large televisions. In that case, it is used such that the main surface opposite to the antireflection layer of the antireflection film is the display side.

  Further, the configuration of the front filter for display in which the antireflection film of the present invention is arranged is not particularly limited, but the main surface on the opposite side of the antireflection layer of the present invention is bonded to a transparent substrate. It is what was done. Although it does not specifically limit as a transparent base material used for the said filter, For example, a glass base material, a plastic base material, a transparent film etc. are used. Furthermore, the substrate itself may be a film having functionality such as near infrared shielding and electromagnetic shielding. In addition, in order to distinguish the transparent base material used for the front filter for a display from the transparent base material of the antireflection film mentioned above, this is hereinafter abbreviated as “filter base material”.

  Adhesion of the antireflection film of the present invention to the filter substrate may be appropriately bonded onto the substrate with an adhesive or a pressure-sensitive adhesive.

  In addition, a pigment | dye content layer and an electromagnetic wave shielding body may be arrange | positioned between the said filter base material and an antireflection film as needed. If necessary, a dye-containing layer, an electromagnetic wave shielding body, an adhesive material layer, and the like may be disposed on the surface of the filter substrate opposite to the side on which the antireflection film is bonded.

  The front filter for display of the present invention is applied to the front side of the display surface of a display such as a liquid crystal display or a plasma display panel (PDP), and exhibits an antireflection function according to the type of constituent layers of the antireflection film used. When an antireflection film further having an infrared absorbing layer is used, a display front filter capable of exhibiting an antireflection function and a filter function for shielding near infrared rays can be provided.

  EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, this invention is not limited to a following example. In the examples and comparative examples, “parts” means parts by weight.

(Example 1)
An antireflection film for evaluation was produced as follows.

As a polyester substrate, an ultraviolet-cutting polyethylene terephthalate (PET) film having a thickness of 100 μm and having a silica-containing primer layer made of a polyester resin was prepared. Zirconium oxide fine particles (manufactured by 1st rare element, particle size 10 nm) 10 parts “Disperbyk-180” (dispersant manufactured by BYK Chemie) 1.0 part acetylacetone 5.0 parts 35 parts of propylene glycol monomethyl ether and zirconia beads with a diameter of 0.3 mm And dispersed in a paint shaker for 3 hours, and then the zirconia beads were removed to prepare ZrO ₂ dispersion A.

In this dispersion A, 3 parts of pentaerythritol triacrylate 2.8 parts of dipentaerythritol hexaacrylate “IRGACURE907” (photopolymerization initiator made by Ciba Specialty Chemicals) 0.29 part “TINUVIN400” (hydroxyphenyltriazine UVA made by Ciba Specialty Chemicals) 2.11 parts The coating composition for forming the first layer was prepared by adding.

The coating material for the first layer was applied to one side of the translucent PET film using a micro gravure coater (manufactured by Yasui Seiki Co., Ltd.) and then dried. Subsequently, the coating film was cured by irradiating the coating film with ultraviolet rays at a dose of 500 mJ / cm ² to form a first layer having a thickness of 1.5 μm.

Thereafter, a hollow silica fine particle-dispersed ultraviolet curable low refractive index paint (“ELCOM P-5013” manufactured by Catalytic Chemical Co., Ltd.) was applied on the first layer using a microgravure coater and dried. Thereafter, the coating film was cured by irradiating the coating film with ultraviolet rays at a dose of 800 mJ / cm ² to form a low refractive index layer having a thickness of 107 nm.

(Example 2)
In dispersion A prepared in Example 1, pentaerythritol triacrylate 3 parts dipentaerythritol hexaacrylate 2.8 parts "IRGACURE907" (photopolymerization initiator manufactured by Ciba Specialty Chemicals) 0.29 part "TINUVIN400" (hydroxyphenyltriazine system manufactured by Ciba Specialty Chemicals) UVA) 1.74 parts “TINUVIN123” (HALS manufactured by Ciba Specialty Chemicals) 0.116 parts was added to prepare an antireflection film in the same manner as in Example 1, except that the coating material for forming the first layer was prepared.

(Example 3)
In dispersion A prepared in Example 1, pentaerythritol triacrylate 4 parts dipentaerythritol hexaacrylate 4 parts “IRGACURE907” (photopolymerization initiator manufactured by Ciba Specialty Chemicals) 0.4 part “TINUVIN400” (hydroxyphenyltriazine system manufactured by Ciba Specialty Chemicals) UVA) An antireflection film was produced in the same manner as in Example 1 except that 5 parts of propylene glycol monomethyl ether was added to prepare a coating material for forming the first layer.

(Comparative Example 1)
Prepare 1st layer forming paint by adding 0.29 parts "IRGACURE907" (photopolymerization initiator manufactured by Ciba Specialty Chemicals) 2.8 parts dipentaerythritol hexaacrylate 3 parts dipentaerythritol hexaacrylate to dispersion A prepared in Example 1 An antireflection film was produced in the same manner as in Example 1 except that.

(Comparative Example 2)
In dispersion A prepared in Example 1, pentaerythritol triacrylate 3 parts dipentaerythritol hexaacrylate 2.8 parts "IRGACURE907" (photopolymerization initiator manufactured by Ciba Specialty Chemicals) 0.29 part "TINUVIN400" (hydroxyphenyltriazine system manufactured by Ciba Specialty Chemicals) An antireflection film was produced in the same manner as in Example 1 except that 1 part of UVA) was added to prepare a coating material for forming the first layer.

(Comparative Example 3)
In dispersion A prepared in Example 1, pentaerythritol triacrylate 3 parts dipentaerythritol hexaacrylate 2.8 parts "IRGACURE907" (Ciba Specialty Chemicals photoinitiator) 0.29 parts "TINUVIN400" (Ciba Specialty Chemicals hydroxyphenyl triazine system) An antireflection film was produced in the same manner as in Example 1 except that 2.9 parts of UVA) were added to prepare a coating material for forming the first layer.
The antireflection films prepared in the above Examples and Comparative Examples were stored in a light resistance tester for 500 hours, and the increase in visibility reflectance, haze increase, and adhesion before and after that were evaluated. The results are shown in Table 1.

<Visibility reflectance>
A black tape was applied to the side of the antireflection film opposite to the antireflection layer, and measurement was performed using an instantaneous multiphotometry system “MCPD-3000” manufactured by Otsuka Electronics Co., Ltd.
<Haze>
This was measured using a Nippon Denshoku haze meter “NDH-2000”.
<Light resistance tester>
A storage test was conducted under the following conditions using a lamp “UVA-340”, a weathering tester manufactured by Q-Panel.
Irradiation condition Setting illuminance 0.77W / m ² Panel temperature 63 ℃
<Adhesiveness>
It was examined by a cross cut test and expressed by the number of remaining squares. (Conforms to JIS K5600-5-6: 1999)

In Table 1, the metal content represents the weight percent of the layer with respect to the ultraviolet curable resin.

  In Comparative Example 1, the coating film peeled after 500 hours of the storage test. Further, Comparative Example 3 was insufficiently cured and could not form an antireflection film.

  The present invention can be implemented in other forms than the above without departing from the spirit of the present invention. The embodiments disclosed in the present application are examples, and the present invention is not limited thereto. The scope of the present invention is construed in preference to the description of the appended claims rather than the description of the above specification, and all modifications within the scope equivalent to the claims are included in the scope of the claims. It is what

  The antireflection film of the present invention and the front filter for display using the same can provide an antireflection film having antireflection performance with excellent light resistance and a display front filter using the antireflection film. It can be used effectively by providing it in front of a plasma display panel (PDP) or a liquid crystal display used as a display panel of an electronic device.

Claims (6)

At least a metal oxide, an ultraviolet curable resin, and an ultraviolet absorber, wherein the amount of the metal oxide is 40 to 300 weight percent with respect to the ultraviolet curable resin;
An antireflection layer comprising a layer (A) having a thickness of 0.5 to 2 μm prepared by applying, drying and curing a paint having an ultraviolet absorber amount of 20 to 40 weight percent with respect to the ultraviolet curable resin, An antireflection film provided on one main surface of the translucent substrate.   2. The antireflection according to claim 1, wherein the paint containing at least the metal oxide, the ultraviolet curable resin and the ultraviolet absorber is a paint further containing 1 to 5% by weight of a hindered amine light stabilizer relative to the ultraviolet curable resin. the film.   The antireflection film according to claim 1, wherein the ultraviolet absorber is a hydroxyphenyltriazine compound. When a storage test for irradiating the film surface with light having a wavelength of 340 nm at an intensity of 0.77 W / m ² is performed for 500 hours, the increase in the visibility reflectance before and after the test is 0.3% or less, and the increase in the haze value is 0.5 or less. The antireflection film according to any one of claims 1 to 3.   The antireflection film according to any one of claims 1 to 4, wherein a layer having a refractive index lower than that of the layer (A) is provided with a thickness of 80 nm to 130 nm.   A front filter for a display, wherein the antireflection film according to any one of claims 1 to 5 is disposed on a substrate.