TWI586995B - Anti-glare film - Google Patents

Description

Anti-glare film

Priority is claimed on Japanese Patent Application No. 2014-080733, the entire disclosure of which is incorporated herein by reference.

The present invention relates to an anti-glare film. Further, the present invention relates to a display device to which the above anti-glare film is attached.

The optical film is widely used as a liquid crystal display device or the like as a transparent film having a specific function. For example, a surface protective film and an anti-glare film used for the surface of a liquid crystal display device are exemplified as an optical film. The surface protective film is a film for protecting glass on the surface of a liquid crystal display device or the like, and has sufficient hardness that is not easily damaged even when applied to a surface for a long period of time. The anti-glare film is attached to the surface of a liquid crystal display device or the like in order to impart good visibility without reflection. Since the anti-glare film is attached to the surface of a liquid crystal display device or the like, it is expected to function as a surface protective film having not only anti-glare properties but also sufficient hardness which is not easily damaged. As such a film, an antiglare hard coat film having a hard coat layer is used.

As a conventional anti-glare hard coat film, for example, Patent Document 1 discloses an anti-glare hard coat film which is obtained by providing an anti-glare hard coat layer containing organic fine particles and a resin on a transparent film. The average particle diameter of the organic fine particles is 2 to 6 μm, and the refractive index difference from the resin is 0.001 to 0.020. The coating film thickness of the antiglare hard coat layer is 1 to 2 times the average particle diameter of the organic fine particles, and the haze value of the antiglare hard coat film is 0.1 to 3 parts by weight to 100 parts by weight of the resin. 5.0%, 60 degree specular gloss is 60% or more and 90% or less, and 20 degree specular gloss is 15% or more and 40% or less, and the visual transmittance (penetration Y value) is 88.00 or more.

However, the antiglare hard coat film of Patent Document 1 has an average particle diameter of the fine particles of 2 to 6 μm, and it is not possible to sufficiently prevent glare on today's high-definition display, and it is impossible to provide a visually pleasing screen. Further, the antiglare hard coat film of Patent Document 1 does not have sufficient hardness.

Further, for example, Patent Document 2 discloses an anti-glare film having an anti-glare layer obtained by curing a curable composition on a transparent cellulose ester film substrate, and the solid content concentration of the curable composition is 3% by mass or more and 60% by mass or less, and (A) a curable compound, (B) a phosphine oxide-based initiator of 0.5 to 2.0% by mass based on the curable compound (A), and (C) The total solid content is 5 to 15% by mass of the light-transmitting resin particles having an average particle diameter of 2 to 8 μm, the film thickness of the anti-glare layer is 3 to 15 μm, and the total haze of the anti-glare film is 0.5 to 2.5%. .

However, the light-transmitting resin particles of the anti-glare film of Patent Document 2 have a large particle diameter and are liable to cause glare, and it cannot be said that they have good visibility.

Further, for example, Patent Document 3 discloses an anti-glare film having an anti-glare formed of a composition containing at least (A) a curable resin compound and (B) a light-transmitting particle on a transparent support. In the layer, the film thickness of the anti-glare layer is divided by the average particle diameter of the (B) light-transmitting particles to be 1.1 to 3.0, and the total haze value of the anti-glare film is 0.5 to 5.0%. The internal haze value is 1.5% or less, and the uneven distribution ratio of the upper portion in the above-described antiglare layer of the above-mentioned (B) light-transmitting particles is represented by the following formula 45% to 99%.

The upper uneven distribution ratio = [in the film thickness direction of the layer formed of the composition containing the components of (A) and (B), the film thickness is 50% from the center of the layer on the opposite side to the transparent support The number of (B) components in the region] ÷ [total number of components (B) present in the entire layer formed of the components including the components (A) and (B)] × 100 (%)

However, in the anti-glare film of Patent Document 3, when the particle diameter of the light-transmitting particles is small, the film thickness of the anti-glare layer is extremely thin, and the hardness of the anti-glare film is insufficient. Further, it is difficult to stably scatter the light-transmitting particles in the upper portion in the anti-glare layer on the technical level, and the surface of the anti-glare layer is uneven.

Further, other conventional anti-glare films are excessively considered to improve the anti-glare property, and it is not possible to eliminate the blush of a coating film formed as a layer for imparting anti-glare properties. In the conventional anti-glare film, when an image is displayed on a liquid crystal display device or the like to which the anti-glare film is attached, the screen of the liquid crystal display device or the like is whitened, and contrast is lowered and glare is generated.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2010-256850

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2013-76785

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2012-159691

The conventional antiglare hard coat film has a problem in that it is not possible to sufficiently prevent a decrease in contrast, glare, or the like to impart good visibility to a liquid crystal display device or the like, and does not have sufficient hardness. In particular, there is a high definition liquid crystal display device Give the question of good visibility.

The present invention has been made in view of such problems in the prior art, and an object thereof is to provide an anti-glare film which can improve the visibility of a display device by having sufficient anti-glare property and having a clear feeling, and is sufficient. hardness.

As a result of intensive studies, the inventors of the present invention have found that the above problems can be solved by using an anti-glare film having a transparent film and an anti-glare layer containing microparticles and a tree finger. The 60-degree gloss (β) of the anti-glare film satisfies the following formula: β when the haze value of the anti-glare film is (α)% and the variable X is 85≦X≦105. X-12×log _e (α), the thickness (t) μm of the antiglare layer satisfies the following formula when the average particle diameter of the fine particles is (r) μm and the variable Y is 4≦Y≦10: t = (r ^1/2 ) × Y, and the average particle diameter (r) of the above fine particles is 0.1 to 3.0 μm.

The present invention has the following aspects.

[1] An anti-glare film comprising a transparent film and an anti-glare layer containing fine particles and a resin, wherein the anti-glare film has a 60 degree gloss (β) of the haze of the anti-glare film When the value is (α)% and the variable X is 85≦X≦105, the following formula is satisfied: β=X-12×log _e (α), and the thickness (t) μm of the anti-glare layer is used for the above-mentioned fine particles. When the average particle diameter is (r) μm and the variable Y is 4 ≦ Y ≦ 10, the following formula is satisfied: t = (r ^1/2 ) × Y, and the average particle diameter (r) of the above fine particles is 0.1 to 3.0. Mm.

[2] The antiglare film according to [1], wherein the resin is a free radiation curable resin.

[3] The antiglare film according to [1] or [2], wherein the fine particles are inorganic fine particles.

[4] The antiglare film according to any one of [1] to [3] wherein the thickness (t) μm of the antiglare layer is divided by the average particle diameter (r) μm of the fine particles. It is 2~15.

[5] The antiglare film according to any one of [1] to [4] wherein the thickness (t) μm of the antiglare layer is divided by the average particle diameter (r) μm of the fine particles. It is 3.5~10.

[6] The anti-glare film according to any one of [1] to [5] wherein the anti-glare film has a haze value (α) of 2 to 10%.

[7] The antiglare film according to any one of [1] to [6] wherein the antiglare film has a total light transmittance of 88% or more.

The anti-glare film of the present invention can improve the visibility of the display device while having sufficient anti-glare property and having a clear feeling, while having sufficient hardness.

1‧‧‧Anti-glare layer

2‧‧‧Transparent film

3‧‧‧Adhesive layer

4‧‧‧ peeling layer

10, 11‧‧‧ anti-glare film

20‧‧‧Glass (the most superficial member of the display device)

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing an anti-glare film according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view showing an antiglare film according to an embodiment of the present invention and an antiglare film in which an adhesive layer and a release layer are laminated.

Fig. 3 is a schematic cross-sectional view for explaining a configuration of a display device to which an anti-glare film according to an embodiment of the present invention is attached.

Hereinafter, the present invention will be described with reference to the accompanying drawings and embodiments.

Figure 1 is a schematic cross-sectional view showing an anti-glare film according to an embodiment of the present invention Figure.

The anti-glare film 10 has a transparent film 2 and an anti-glare layer 1 laminated on one surface of the transparent film 2. The anti-glare film of the present invention may also have a layer other than the transparent film and the anti-glare layer. For example, as shown in FIG. 2, the anti-glare film 11 of the present invention has a transparent film 2, an anti-glare layer 1 laminated on one surface of the transparent film 2, and an adhesive layer 3 laminated on the other surface of the transparent film 2. And a peeling layer 4 which is present on the surface of the adhesive layer 3 opposite to the transparent film 2. Although not illustrated, on the surface of the anti-glare layer 1 (the surface opposite to the transparent film 2), a protective layer for bonding the anti-glare film 10 to the display device may be further laminated. The surface of the anti-glare layer 1 is temporarily protected before. The antiglare film 10 is not particularly limited as long as the antiglare layer 1 is present on the outermost layer.

Fig. 3 is a schematic cross-sectional view showing a cross section of a display device in which an anti-glare film of the present invention is bonded to the surface. The glass 20 is a member of the display device that is disposed on the outermost surface of the display device. The display device is, for example, a liquid crystal display device (LCD), a plasma display panel (PDP), an electroluminescence display (ELD), or a cathode tube display device (CRT), and is not particularly limited. In FIG. 3, the anti-glare film 10 is attached to the surface of the glass 20 via the adhesive layer 3. The configuration shown in FIG. 3 can be formed by attaching the peeling layer 4 from which the anti-glare film 11 is removed to the surface of the glass 20, or by attaching or forming an adhesive layer 3 on the surface of the glass 20. The surface area of the adhesive layer 3 is formed by the anti-glare film 10. Further, the glass 20 is not particularly limited and is a member constituting the outermost surface of the display device. The glass 20 may be replaced with other members such as a hard coat film, for example.

<anti-glare layer>

The 60-degree gloss (β) of the anti-glare film satisfies the formula: β=X-12×log _e when the haze value of the anti-glare film is (α)% and the variable X is 85≦X≦105. (α). Log _e (α) represents the logarithm of the percentage value (α) of the haze with the Napier's constant (e = 2.7182...) as the base. Therefore, the β-system independent variable X is a value obtained by multiplying the logarithm of the haze value (α)% of the base number by the Napier constant by -12. The above formula is satisfied by a 60 degree gloss (β), and the above variable X is preferably a formula satisfying 85 ≦ X ≦ 100, and more preferably a formula satisfying 85 ≦ X ≦ 95.

In the present invention, the 60-degree gloss (β) and the haze value (α)% of the anti-glare film can be measured by the following procedure.

The 60 degree gloss (β) was measured in accordance with JIS Z 8741. Specifically, a black plastic tape (Nitto plastic tape, PROSELF No. 21 (wide)) was attached to each anti-glare hard coat film by using a gloss meter (GM-3D) manufactured by Murakami Color Technology Research Institute. The 60-degree gloss of each anti-glare hard coat film was measured in the state of the opposite side of the cloth (the surface on the side where the film was not applied).

The haze value (α) was measured in accordance with JIS K 7136. Specifically, the measurement was performed using a haze meter "NDH4000" manufactured by Nippon Denshoku Co., Ltd.

The thickness (t) μm of the antiglare layer satisfies the formula: t = (r ^1/2 ) × Y when the average particle diameter of the fine particles is (r) μm and the variable Y is 4 ≦ Y ≦ 10 . t is a value obtained by multiplying the square root of the average particle diameter (r) μm by Y. The above-mentioned variable Y is preferably a formula satisfying 5 ≦ Y ≦ 10, and more preferably a formula satisfying 5 ≦ Y ≦ 9.

The thickness (t) of the antiglare layer can be measured, for example, by observing a cross-sectional photograph of the antiglare layer with an electron microscope or the like and measuring the interface to the surface.

The average particle diameter (r) of the fine particles contained in the antiglare layer is 0.1 to 3.0 μm. The average particle diameter (r) is preferably 0.1 to 2.5 μm, more preferably 0.1 to 2.0 μm, still more preferably 0.2 to 2.0 μm, still more preferably 0.3 to 2.0 μm, still more preferably 0.4. ~2.0μm, preferably 0.5~2.0μm.

The resin contained in the antiglare layer is preferably a free radiation hardening resin. The free radiation curable resin refers to a resin which is hardened by irradiation with an electron beam or ultraviolet rays. In the present invention, the free radiation hardening resin is preferably substantially transparent. As the substantially transparent free radiation curing resin, for example, an acrylic ultraviolet curing resin is preferably used. The acrylic resin is a resin obtained by polymerizing a resin composition having a monomer component of a (meth) acrylonitrile group as a main component. The acrylic resin is preferably a polyol polyacrylate such as dipentaerythritol hexaacrylate as a main component.

As the fine particles contained in the antiglare layer, organic fine particles or inorganic fine particles can be used. The fine particles contained in the anti-glare layer may also be a mixture of organic fine particles and inorganic fine particles. Further, the fine particles contained in the antiglare layer may be a mixture of two or more different types of fine particles.

As the material of the organic fine particles, a material having a refractive index which is smaller than the refractive index of a resin constituting the main component of the antiglare layer (for example, an ionizing radiation curable resin) is preferably used. The difference in refractive index is, for example, preferably 0.1 or less, more preferably 0.01 or less. More preferably, organic fine particles containing the same resin as the resin constituting the antiglare layer are used. Examples of the material for forming the organic fine particles include triacetyl cellulose resin, polycarbonate resin, polyethylene terephthalate resin, and lowering. An olefin resin, a polyethylene resin, an acrylic resin, or the like.

As the inorganic fine particles, metal oxide particles can be used. As the metal oxide particles, for example, cerium oxide particles or alumina particles are preferable. The inorganic fine particles are preferably those having a refractive index which is smaller than the refractive index of the resin constituting the main component of the antiglare layer (for example, the free radiation curing resin). The difference in refractive index is, for example, preferably 0.1 or less, more preferably 0.01 or less. Cerium oxide can be obtained, for example, by a wet method.

The antiglare layer can be formed by applying a coating liquid containing a resin and fine particles to the surface of an object (transparent film) and drying it.

The content of the resin is preferably 15 to 55% by weight, more preferably 20 to 50% by weight, still more preferably 25 to 45% by weight based on 100% by weight of the total weight of the coating liquid for forming the antiglare layer. %, preferably 30~45% by weight.

The content of the fine particles is preferably from 1 to 50% by weight based on 100% by weight of the total weight of the resin contained in the coating liquid for forming the antiglare layer. The optical characteristics of the antiglare film of the present invention are further excellent in that the content of the fine particles is within this range. The content of the above fine particles is more preferably 2 to 45% by weight, still more preferably 5 to 40% by weight, most preferably 10 to 30% by weight.

The coating liquid may also contain a solvent for dissolving or dispersing the resin and the fine particles. As the solvent, an aromatic hydrocarbon such as toluene or an alkyl alcohol having 1 to 5 carbon atoms such as isobutanol can be used. A solvent containing an aromatic hydrocarbon and an alcohol having 1 to 5 carbon atoms is preferred.

In the case where the solvent of the coating liquid contains an aromatic hydrocarbon and an alcohol having 1 to 5 carbon atoms, the ratio of the aromatic hydrocarbon to the alcohol having 1 to 5 carbon atoms is preferably 2:1 to 1:2. The above ratio is more preferably from 3:2 to 2:3, further preferably from 5:4 to 4:5, and most preferably substantially 1:1.

In order to sufficiently dissolve or disperse the resin and the fine particles, the content of the solvent contained in the coating liquid is preferably 20 to 80% by weight based on 100% by weight of the total weight of the coating liquid. The content of the solvent is more preferably from 30 to 70% by weight, still more preferably from 40 to 60% by weight.

The antiglare layer can be applied by, for example, gravure coating, micro gravure coating, bar coating, slide die coating, slit die coating, dip coating, or the like. The thickness of the anti-glare layer can be easily adjusted by these methods. Furthermore, the thickness of the anti-glare layer The degree can be measured, for example, by observing a cross-sectional photograph of the anti-glare layer with an electron microscope or the like and measuring the interface to the surface.

The value obtained by dividing the thickness (t) μm of the antiglare layer by the average particle diameter (r) μm of the fine particles is preferably 2 to 15, more preferably 3.5 to 10, most preferably 7 to 8.

<Transparent film>

As the transparent film constituting the antiglare film of the present invention, for example, a triacetone cellulose film, a polycarbonate film, an acrylic film, a polyethylene terephthalate film, or a film can be used. A resin film having high transparency such as an ene film. Further, in the present specification, the case where the film is transparent is not particularly limited. Generally, the term "transparent film" means that the total light transmittance is 88% or more. Films other than the films exemplified above may also be used. The phase difference due to the birefringence of the transparent film is also not particularly limited. A normal stretch film of 2000 to 5000 nm, a low retardation film of less than 2000 nm, a high retardation film of more than 5000 nm, and the like can be used depending on the application. The thickness of the transparent film can be, for example, 10 to 250 μm. The thickness of the transparent film is preferably from 25 to 200 μm, more preferably from 50 to 150 μm. The antiglare film of the present invention has sufficient strength and preferable optical characteristics by the thickness of the transparent film being in the above range.

<anti-glare film>

The haze value (α) of the above anti-glare film is preferably from 2 to 10%. When the haze value is within this range, the blushing when the anti-glare film is attached to the display device is sufficiently low. The haze value (α) of the above anti-glare film is more preferably from 2 to 8%, further preferably from 2 to 6%, most preferably from 2 to 4%.

The total light transmittance of the above anti-glare film is preferably 88% or more. When the total light transmittance is within this range, when the anti-glare film is attached to the display device, The brightness and contrast of the display device become higher. The total light transmittance is more preferably 90% or more, further preferably 92% or more, and most preferably 94% or more.

[Examples]

Hereinafter, the present invention will be described more specifically by way of examples, but the invention is not limited to the examples.

<Example 1> Preparation of coating liquid

90 parts by weight of an acrylic ultraviolet curable resin (100% solid content, trade name: Light Acrylate DPE-6A, manufactured by Kyoeisha Chemical Co., Ltd.), and 10 parts by weight of cerium oxide having an average particle diameter of 1.0 μm (product) Name: SEAHOSTAR, Nippon Shokubai Co., Ltd., 0.3 parts by weight of dispersant (trade name: DISPERBYK102, manufactured by BYK-Chemie Japan Co., Ltd.), and 0.2 parts by weight of anti-precipitation agent (trade name: BYK411, BYK-Chemie Japan Dispersion was obtained to obtain a dispersion (A).

Preparation of dispersion

By mixing 47.6 parts by weight of the above-mentioned dispersion (A) with 2.4 parts by weight of a photoinitiator (trade name: IRGACURE 184, manufactured by BASF Co., Ltd.), 25 parts by weight of toluene, and 25 parts by weight of isobutanol, the coating was obtained by stirring. Cloth liquid (B).

Production of anti-glare film

The coating liquid (B) was applied to a one-sided surface of a PET (polyethylene terephthalate) film (trade name: Lumirror, manufactured by Toray Co., Ltd.) having a thickness of 100 μm by a bar coater. And the ultraviolet rays of 300 mJ/cm ² were irradiated and hardened, thereby obtaining an anti-glare film. The obtained antiglare film had an average film thickness of 7.1 μm.

<Example 2> Preparation of dispersion and preparation of coating liquid

The coating liquid (C) was obtained in the same manner as in Example 1 except that the amount of the cerium oxide particles of the dispersion (A) of Example 1 was changed to 20 parts by weight.

Production of anti-glare film

The obtained coating liquid (C) was applied to a PET (polyethylene terephthalate) film (trade name: Lumirror, manufactured by Toray Co., Ltd.) having a thickness of 100 μm by a bar coater, and The ultraviolet ray of 300 mJ/cm ^{2 was} irradiated and hardened, whereby an anti-glare film was obtained. The obtained antiglare film had an average film thickness of 7.3 μm.

<Example 3> Preparation of dispersion and preparation of coating liquid

The coating liquid (D) was obtained in the same manner as in Example 1 except that the amount of cerium oxide contained in the dispersion (A) of Example 1 was changed to 30 parts by weight.

Production of anti-glare film

The obtained coating liquid (D) was applied to a PET (polyethylene terephthalate) film (trade name: Lumirror, manufactured by Toray Co., Ltd.) having a thickness of 100 μm by a bar coater, and The ultraviolet ray of 300 mJ/cm ^{2 was} irradiated and hardened, whereby an anti-glare film was obtained. The obtained antiglare film had an average film thickness of 7.3 μm.

<Example 4> Preparation of dispersion and preparation of coating liquid

In the same manner as in Example 1, except that the cerium oxide of the dispersion (A) of Example 1 was changed to 10 parts by weight of cerium oxide having an average particle diameter of 0.4 μm (trade name: SEAHOSTAR, manufactured by Nippon Shokubai Co., Ltd.). A coating liquid (E) was obtained.

Production of anti-glare film

The obtained coating liquid (E) was applied to a PET (polyethylene terephthalate) film (trade name: Lumirror, manufactured by Toray Co., Ltd.) having a thickness of 100 μm by a bar coater, and The ultraviolet ray of 300 mJ/cm ^{2 was} irradiated and hardened, whereby an anti-glare film was obtained. The obtained antiglare film had an average film thickness of 4.0 μm.

<Comparative Example 6> Preparation of dispersion and preparation of coating liquid

In the same manner as in Example 1, except that the cerium oxide particles of the dispersion (A) of Example 1 were changed to 10 parts by weight of cerium oxide having an average particle diameter of 2.8 μm (trade name: SEAHOSTAR, manufactured by Nippon Shokubai Co., Ltd.). The coating liquid (F) was obtained in a manner.

Production of anti-glare film

The obtained coating liquid (F) was applied to a PET (polyethylene terephthalate) film (trade name: Lumirror, manufactured by Toray Co., Ltd.) having a thickness of 100 μm by a bar coater, and The ultraviolet ray of 300 mJ/cm ^{2 was} irradiated and hardened, whereby an anti-glare film was obtained. The obtained antiglare film had an average film thickness of 7.6 μm.

<Example 6> Production of anti-glare film

The coating liquid (C) was applied to a TAC (triethyl fluorene cellulose) film (trade name: Fujitac, manufactured by Fujifilm) having a thickness of 100 μm by a bar coater, and irradiated with ultraviolet rays of 300 mJ/cm ² . It is hardened, whereby an anti-glare film is obtained. The obtained antiglare film had an average film thickness of 7.0 μm.

<Example 7> Production of anti-glare film

The coating liquid (C) was applied to an acrylic film (trade name: TECHNOLLOY, manufactured by Sumitomo Chemical Co., Ltd.) having a thickness of 75 μm by a bar coater, and irradiated with ultraviolet rays of 300 mJ/cm ² to cure the film. An anti-glare film is obtained. The obtained antiglare film had an average film thickness of 7.1 μm.

<Example 8> Preparation of dispersion and preparation of coating liquid

The cerium oxide particles of the dispersion (A) of Example 1 were changed to 20 parts by weight of acrylic particles having an average particle diameter of 1.5 μm (trade name: MX-150, Amoi Chemical Co., Ltd.), and Example 1 The coating liquid (G) was obtained in the same manner.

Production of anti-glare film

The obtained coating liquid (G) was applied to a PET (polyethylene terephthalate) film (trade name: Lumirror, manufactured by Toray Co., Ltd.) having a thickness of 100 μm by a bar coater, and The ultraviolet ray of 300 mJ/cm ^{2 was} irradiated and hardened, whereby an anti-glare film was obtained. The obtained antiglare film had an average film thickness of 8.5 μm.

<Comparative Example 1> Preparation of dispersion and preparation of coating liquid

2.4 parts by weight of a photoinitiator (product: IRGACURE 184, manufactured by BASF Co., Ltd.), 40 parts by weight of toluene, and 25 parts by weight of isobutanol were mixed with 47.6 parts by weight of the dispersion (A) of Example 1 and stirred. A coating liquid (H) was obtained.

Production of anti-glare film

The obtained coating liquid (H) was applied to a PET (polyethylene terephthalate) film (trade name: Lumirror, manufactured by Toray Co., Ltd.) having a thickness of 100 μm by a bar coater, and The ultraviolet ray of 300 mJ/cm ^{2 was} irradiated and hardened, whereby an anti-glare film was obtained. The obtained antiglare film had an average film thickness of 7.5 μm.

<Comparative Example 2> Preparation of dispersion and preparation of coating liquid

47.6 parts by weight of the dispersion (A) of Example 1 was mixed with 0.4 parts by weight of a photoinitiator (trade name: IRGACURE 184, manufactured by BASF Co., Ltd.), 10 parts by weight of toluene, and 25 parts by weight of isobutanol, followed by stirring. Coating liquid (I).

Production of anti-glare film

The obtained coating liquid (I) was applied to a PET (polyethylene terephthalate) film (trade name: Lumirror, manufactured by Toray Co., Ltd.) having a thickness of 100 μm by a bar coater, and The ultraviolet ray of 300 mJ/cm ^{2 was} irradiated and hardened, whereby an anti-glare film was obtained. The obtained antiglare film had an average film thickness of 7.1 μm.

<Comparative Example 3> Production of anti-glare film

The coating liquid (B) obtained in Example 1 was applied to a PET (polyethylene terephthalate) film having a thickness of 100 μm by a bar coater (trade name: Lumirror, Toray Co., Ltd.) The film was produced and cured by irradiating ultraviolet rays of 300 mJ/cm ² to obtain an anti-glare film. The obtained antiglare film had an average film thickness of 1.9 μm.

<Comparative Example 4> Production of anti-glare film

The coating liquid (B) obtained in Example 1 was applied to a PET (polyethylene terephthalate) film having a thickness of 100 μm by a bar coater (trade name: Lumirror, Toray Co., Ltd.) The film was produced and cured by irradiating ultraviolet rays of 300 mJ/cm ² to obtain an anti-glare film. The obtained antiglare film had an average film thickness of 15.4 μm.

<Comparative Example 5> Preparation of dispersion and preparation of coating liquid

In addition to changing the cerium oxide of the dispersion (A) of Example 1 to 10 parts by weight of cerium oxide having an average particle diameter of 5.0 μm (trade name: SHARK-SIL, manufactured by Tokai Chemical Industry Co., Ltd.), The coating liquid (J) was obtained in the same manner as in Example 1.

Production of anti-glare film

The obtained coating liquid (J) was applied to a PET (polyethylene terephthalate) film (trade name: Lumirror, manufactured by Toray Co., Ltd.) having a thickness of 100 μm by a bar coater, and The anti-glare film was obtained by hardening by ultraviolet rays of 300 mJ/cm ² . The obtained antiglare film had an average film thickness of 11.0 μm.

The following items were evaluated for each of the antiglare hard coat films of the examples and the comparative examples produced as described above, and the results thereof are collectively shown in Table 1 below.

(1) Haze value

The haze value of each antiglare hard coat film was measured according to JIS K 7136 using a haze meter "NDH4000" manufactured by Nippon Denshoku Co., Ltd.

(2) 60 degree gloss

According to JIS Z 8741, a black plastic tape (Nitto plastic tape, PROSELF No. 21 (wide width)) was attached to each anti-glare hard coating film using a gloss meter (GM-3D) manufactured by Murakami Color Technology Research Institute. The 60-degree gloss of each of the anti-glare hard coat films was measured in the state where the opposite surface (the surface on the side where the film was not applied) was applied.

(3) a sense of clarity

Each of the anti-glare films obtained in the examples and the comparative examples was placed at a position of 0.5 m from the observer, and a liquid crystal display placed at a position of 1.0 m from the observer was observed. The anti-glare film having a good image clarity when the image is displayed on the liquid crystal display is evaluated as "◎", and the film having a good image sharpness is evaluated as "○", and the image is sharp. The poor film was evaluated as "X".

(4) Anti-glare

The antiglare films obtained in the above examples and comparative examples were pasted with an adhesive It is attached to a black plastic plate, and the fluorescent lamp is reflected in each anti-glare film, and the light diffusion of the anti-glare film is evaluated by visual inspection. A film having a good light diffusion condition was evaluated as "◎", a relatively good film was evaluated as "○", and a defective film was evaluated as "X".

(5) glare

The anti-glare film obtained in the examples and the comparative examples was separately provided on the surface of a liquid crystal display of 147 [pixels/inch], and glare was evaluated. A good film was evaluated as "?", a relatively good film was evaluated as "○", and a poor film was evaluated as "X".

(6) Pencil hardness

The pencil hardness of each antiglare hard coat film was measured in accordance with JIS K 5600-5-4. The film having a pencil hardness of 3H was evaluated as "○", and the film having a pencil hardness of 2H was evaluated as "X".

Whether or not the anti-glare film of each of the examples and the comparative examples was qualified was determined based on the above evaluation items. Those who are particularly excellent are evaluated as "◎", those who are excellent are evaluated as "○", and those who are not suitable for evaluation by the user are "X". These results are shown in Table 1 below.

It is understood that the antiglare films obtained in Examples 1 to 4 and 6 to 8 have moderate antiglare properties and have a clear feeling compared with the antiglare films of Comparative Examples 1 to 5, and have excellent pencil hardness. In particular, the antiglare films of Examples 1 and 2 are excellent in sharpness, antiglare property, antiglare, and hardness, and are particularly excellent antiglare films.

Claims (7)

An anti-glare film comprising a transparent film and an anti-glare layer containing fine particles and a resin, wherein the anti-glare film has a 60 degree gloss (β) for setting a haze value of the anti-glare film When (α)% and the variable X is 85≦X≦105, the following formula is satisfied: β=X-12>log _e (α), and the thickness (t) μm of the above anti-glare layer is based on the average of the above-mentioned fine particles. When the particle diameter is (r) μm and the variable Y is 4 ≦ Y ≦ 10, the following formula is satisfied: t = (r ^1/2 ) × Y, and the average particle diameter (r) of the fine particles is 0.1 to 2.5 μm. The anti-glare film of claim 1, wherein the resin is a free radiation curable resin. The anti-glare film of claim 1, wherein the fine particles are inorganic fine particles. The anti-glare film according to any one of claims 1 to 3, wherein the thickness (t) μm of the anti-glare layer is divided by the average particle diameter (r) μm of the fine particles, and the value is 2 to 15 . The anti-glare film according to any one of claims 1 to 3, wherein the thickness (t) μm of the anti-glare layer is divided by the average particle diameter (r) μm of the fine particles to obtain a value of 3.5 to 10 . The anti-glare film according to any one of claims 1 to 3, wherein the anti-glare film has a haze value (α) of 2 to 10%. The anti-glare film according to any one of claims 1 to 3, wherein the anti-glare film has a total light transmittance of 88% or more.