TW201617210A - Anti-glare film and image display device - Google Patents

Abstract

Provided is an anti-glare film with which anti-glare properties and transparency can be maintained and glittering suppressed. This anti-glare film is provided with a transparent substrate and an anti-glare layer disposed on at least one surface of the transparent substrate, wherein the external haze is -5-0.7%. In one embodiment, this anti-glare film has a total haze of 5-40%. In one embodiment, this anti-glare film has an internal haze of 10-40%.

Description

Anti-glare film and image display device

The present invention relates to an anti-glare film.

Conventionally, in the image display device, in order to prevent a decrease in contrast caused by reflection of external light, reflection of an image, or the like, an anti-glare film is used. In recent years, with the high definition of an image display device, there has been a problem that glare caused by an anti-glare film is generated. Specifically, when a conventional anti-glare film is applied to a high-definition image display device, luminance unevenness existing in a pixel is emphasized, and glare is easily generated.

As a technique for solving the above problems, the industry has proposed a technique for improving the internal haze of an anti-glare film. However, in this technique, it is necessary to further improve the internal haze for further high definition in recent years, and it is not suitable for practical use from the viewpoint of transparency.

Further, an image display device having a relatively thick glass or the like disposed on the back side of the anti-glare film, for example, an image display device (for example, a car navigation display, an instrument panel display, etc.) for use in a vehicle for heat resistance is provided. The above problem of glare has become more pronounced.

In this way, in an image display device that requires high definition and heat resistance, an anti-glare film that can maintain anti-glare property and transparency and further suppress glare is applied.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2014-09456

The present invention has been made to solve the above problems, and an object of the invention is to provide an antiglare film which can maintain glare resistance and transparency while further suppressing glare.

The anti-glare film of the present invention comprises: a transparent substrate; and an anti-glare layer disposed on at least one side of the transparent substrate, and having an external haze of -5% to 0.7%.

In one embodiment, the overall haze of the anti-glare film of the present invention is 5% to 40%.

In one embodiment, the internal haze of the anti-glare film of the present invention is 10% to 40%.

In one embodiment, the surface of the anti-glare layer opposite to the transparent substrate is an uneven surface, and the average interval Sm of the unevenness in the uneven surface, the average inclination angle θa, and the arithmetic mean surface roughness of the uneven surface The degree shows the relationship of Ra 0 ≦ Ra / Sm × θa × 1000 ≦ 2 .

In one embodiment, the antiglare layer contains a binder resin and particles, and a difference (n1-n2) between the refractive index n1 of the particles and the refractive index n2 of the binder resin is -0.5 or less.

In one embodiment, the anti-glare layer contains a coagulating filler.

In one embodiment, the cohesive filler is an organic clay.

In one embodiment, the anti-glare film of the present invention further includes at least a portion of a material constituting the transparent substrate and/or at least a portion of the adhesive resin formed between the transparent substrate and the anti-glare layer. The intermediate layer, and the thickness of the intermediate layer is 0.1% to 123% with respect to the thickness of the anti-glare layer.

According to the present invention, by providing the antiglare layer and controlling the external haze of the antiglare layer to a specific range, it is possible to provide an antiglare film which can maintain antiglare property and transparency and further suppress glare. The anti-glare film of the present invention can be disposed not only on an image display device (for example, a personal computer) having a thin glass substrate on the back side of the anti-glare film, but also as described above. An image display device having a relatively thick glass or the like exerts an excellent anti-glare effect and suppresses glare.

1‧‧‧Intermediate

10‧‧‧Transparent substrate

20‧‧‧Anti-glare layer

30‧‧‧Anti-glare layer

30‧‧‧Image display unit

100‧‧‧Anti-glare film

100'‧‧‧Anti-glare film

200‧‧‧Image display device

A‧‧‧Optical components

A‧‧‧thickness

B‧‧‧thickness

X‧‧‧ gap

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

Fig. 2 is a schematic cross-sectional view showing an anti-glare film according to another embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view showing an example of an image display device using the anti-glare film of the present invention.

A. Anti-glare film

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing an antiglare film according to an embodiment of the present invention. The anti-glare film 100 includes a transparent substrate 10 and an anti-glare layer 20 disposed on at least one surface of the transparent substrate 10. The transparent substrate 10 is typically composed of a resin film. The antiglare layer 30 is typically formed by applying a composition for forming an antiglare layer to a resin film. The antiglare layer-forming composition contains a binder resin (or a binder resin precursor) and particles, and the antiglare layer 30 formed of such an antiglare layer-forming composition contains a binder resin and particles. It is preferable that the surface of the anti-glare layer 20 on the side opposite to the transparent substrate 10 is an uneven surface, and has a specific surface shape as described below. In addition, please note that the size of the unevenness with respect to the thickness of each layer in the example of the drawing is different from the actual description for the sake of convenience of observation. Further, although not shown, the anti-glare film may have an anti-reflection layer on the side opposite to the transparent substrate of the anti-glare layer. The antireflection layer can be formed by any suitable method.

Fig. 2 is a schematic cross-sectional view showing an anti-glare film according to another embodiment of the present invention. The anti-glare film 100 ′ includes a transparent substrate 10 and an anti-glare layer 30 disposed on at least one side of the transparent substrate 10 , and an intermediate layer 1 is formed between the transparent substrate 10 and the anti-glare layer 30 . As described above, the transparent substrate 10 is typically composed of a resin film. The antiglare layer 30 is typically formed by applying a composition for forming an antiglare layer to a resin film. The anti-glare layer-forming composition contains a binder resin (or a binder resin precursor) and particles, and is formed of such an anti-glare layer-forming composition. The anti-glare layer 30 is composed of a binder resin and particles. The intermediate layer 1 is typically formed by infiltrating the composition for forming an antiglare layer into the above resin film. When the antiglare layer-forming composition is applied to the resin film to form an antiglare layer, the material constituting the resin film can be eluted into the composition for forming an antiglare layer. The portion formed by dissolving the material constituting the resin film in this manner also corresponds to the intermediate layer 1. That is, the intermediate layer 1 may include at least a part of the material constituting the transparent substrate 10 and at least a part of the binder resin contained in the anti-glare layer 30. The intermediate layer 1 may be a layer formed by dissolving a material constituting the transparent substrate 10 and a binder resin contained in the anti-glare layer 30. Further, the intermediate layer 1 is a layer in contact with both the transparent substrate 10 and the antiglare layer 20.

The thickness of the above anti-glare film is preferably from 15 μm to 500 μm, more preferably from 25 μm to 300 μm, still more preferably from 30 μm to 100 μm.

The external haze of the above anti-glare film is -5% to 0.7%, more preferably -5% to 0.5%, further preferably -2.5% to 0.4%, particularly preferably -2% or more and less than 0%.

The external haze is obtained based on the equation (external haze = overall haze - internal haze). The overall haze can be measured in accordance with JIS K-7136. Further, the measurement of the haze is performed by using the surface of the anti-glare layer opposite to the transparent substrate as the light-emitting surface. The internal haze is a haze measured in a state where the influence of the haze on the surface of the antiglare layer (the light exit side at the time of haze measurement) is eliminated. For example, a triacetyl cellulose (TAC) film is bonded to the surface on the light-emitting side, whereby an evaluation sample in which the surface of the anti-glare layer is flattened and flattened can be produced, and the evaluation test is performed. The haze is set to the internal haze. That is, the evaluation sample in which the surface was flattened exhibited a state in which there was no haze caused by surface unevenness and only internal haze. Therefore, the haze of the evaluation sample can be measured to determine the internal haze. Further, as the evaluation sample, the resin (for example, pentaerythritol triacrylate) may be diluted with toluene or the like on the surface on the light-emitting side to be applied as a solid content of 60% by weight so that the dried film thickness is 8 μm. An evaluation sample was used for the solution. Further, since a leveling agent or the like is added to the composition for forming the antiglare layer, when the coating agent is easily repelled and is not easily wetted, the antiglare film can be saponified in advance (at 2 mol/ l NaOH (or KOH) The solution was immersed in a solution at 55 ° C for 3 minutes, and then washed with water, after which the water droplets were completely removed, and then dried in a 50-degree oven for 1 minute, and subjected to a hydrophilic treatment.

The antiglare film of the present invention can provide excellent antiglare property and transparency and suppress glare by providing an antiglare layer having an external haze of the above range. The anti-glare film of the present invention can be used not only for an image display device (for example, a personal computer) having a thin glass substrate on the back side of the anti-glare film, but also for a glass having a relatively thick glass. The image display device (for example, a vehicle use) exerts an excellent anti-glare effect and suppresses glare. The external haze value can be controlled according to the refractive index of the particles (described below) contained in the antiglare layer, the refractive index of the adhesive resin constituting the antiglare property, the uneven shape of the surface of the antiglare layer, and the like.

The overall haze of the above anti-glare film is preferably 40% or less, more preferably 5% to 40%, still more preferably 15% to 30%. According to the present invention, it is possible to obtain an antiglare film which does not impair the transparency of the antiglare layer, that is, does not increase the haze of the antiglare layer, has excellent antiglare properties, and is excellent in glare suppressing effect.

The internal haze of the above anti-glare film is preferably from 10% to 40%, and more preferably from 20% to 32%.

B. Anti-glare layer

One of the surfaces of the anti-glare layer (the side opposite to the transparent substrate) is preferably an uneven surface. The average interval Sm of the uneven faces is preferably from 150 μm to 350 μm, more preferably from 160 μm to 300 μm, still more preferably from 180 μm to 250 μm.

The average inclination angle θa of the uneven surface is preferably from 0.1 to 2.5, more preferably from 0.2 to 2.0, still more preferably from 0.3 to 1.5.

The arithmetic mean surface roughness Ra of the uneven surface is preferably from 0.05 μm to 0.5 μm, more preferably from 0.08 μm to 0.3 μm, still more preferably from 0.1 μm to 0.25 μm.

Further, the definition of the average interval Sm, the average inclination angle θa, and the arithmetic surface roughness Ra of the uneven surface is based on JIS B 0601 (1994 edition). In addition, these characteristic values can be measured by a stylus type surface roughness measuring instrument (for example, a high-precision fine shape measuring instrument manufactured by Kosaka Research Institute, trade name "Surfcorder ET4000"). Further, the average inclination angle θa is a value defined by the equation of θa = tan ^-1 Δa. Δa is the sum of the difference (height h) between the vertex of the adjacent convex portion and the lowest point of the concave portion in the roughness curve specified in JIS B 0601 (1994 edition) (h1+h2+h3+‧‧‧‧‧ ‧‧+hn) The value obtained by dividing the reference length L of the roughness curve, that is, expressed by the formula Δa=(h1+h2+h3+‧‧‧‧‧‧++hn)/L.

The anti-glare film of the present invention has an anti-glare layer having the surface shape (the average interval Sm of the uneven surface, the average inclination angle θa, and the arithmetic surface roughness Ra) as described above, and the external haze can be a preferable value. As a result, excellent anti-glare property and transparency can be maintained, and glare can be suppressed. The surface shape of the antiglare layer may be, for example, according to the kind, particle diameter and/or content of the particles contained in the antiglare layer, the relationship between the antiglare layer and the particle diameter of the particles, the type of the cohesive filler (described below), and/or The content is controlled and the like.

Preferably, the average interval Sm (μm) of the uneven surface, the average tilt angle θa (°), and the arithmetic surface roughness Ra (μm) show a relationship of 0 ≦ Ra / Sm × θa × 1000 ≦ 2, more preferably, The relationship of 0.1 ≦ Ra / Sm × θa × 1000 ≦ 2 is further preferably a relationship of 0.15 ≦ Ra / Sm × θa × 1000 ≦ 2 . By setting the relationship between the average interval Sm (μm), the average tilt angle θa (°), and the arithmetic surface roughness Ra (μm) as the above-described specific relationship, an anti-glare layer having an external haze of the above range can be easily obtained.

The thickness of the antiglare layer is preferably from 3 μm to 15 μm, more preferably from 4 μm to 13 μm, still more preferably from 5 μm to 12 μm. If it is such a range, the anti-glare film which does not suppress the visibility of an image display apparatus can be acquired. Further, by combining with the following particles, an antiglare layer having a good uneven shape can be obtained.

The antiglare layer preferably contains a binder resin and particles. This antiglare layer is formed by coating a composition for forming an antiglare layer on a resin film constituting a transparent substrate, for example, and then curing the composition. The composition for forming an antiglare layer may contain a curable compound, the above particles, and the like.

The refractive index of the above binder resin is preferably from 1.2 to 2.0, more preferably from 1.3 to 1.9, further preferably from 1.3 to 1.8, and particularly preferably from 1.4 to 1.7. If it is such a range, an anti-glare layer having a preferable external haze can be formed due to the relationship with the refractive index of the particles (described below). The "refractive index of the binder resin" means the refractive index of the region composed of the binder resin in the antiglare layer, and corresponds to the refractive index of the antiglare layer in the absence of particles.

The binder resin is derived from a resin of a curable compound, and examples of the resin include a thermosetting resin and an active energy ray-curable resin.

It is preferable that the composition for forming an antiglare layer contains a polyfunctional monomer, an oligomer derived from a polyfunctional monomer, and/or a prepolymer derived from a polyfunctional monomer as a curable compound which is a main component. As a polyfunctional monomer, a polyfunctional acrylic monomer is mentioned, for example. Specific examples thereof include tricyclodecane dimethanol diacrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, trimethylolpropane triacrylate, and pentaerythritol tetra(methyl). Acrylate, dimethylolpropane tetraacrylate, dipentaerythritol hexa(meth) acrylate, 1,6-hexanediol (meth) acrylate, 1,9-nonanediol diacrylate, 1,10 -decanediol (meth) acrylate, polyethylene glycol di(meth) acrylate, polypropylene glycol di(meth) acrylate, dipropylene glycol diacrylate, tris (meth) acrylate Ester, ethoxylated glycerin triacrylate, ethoxylated pentaerythritol tetraacrylate, and the like. The polyfunctional monomer may be used singly or in combination of plural kinds.

The above polyfunctional monomer may have a hydroxyl group. When the composition for forming an antiglare layer containing a polyfunctional monomer having a hydroxyl group is used, the adhesion between the transparent substrate and the antiglare layer can be improved. Examples of the polyfunctional monomer having a hydroxyl group include pentaerythritol tri(meth)acrylate and dipentaerythritol pentaacrylate.

The content ratio of the above polyfunctional monomer, the oligomer derived from the polyfunctional monomer, and the prepolymer derived from the polyfunctional monomer, and the monomer and oligomer in the composition for forming an antiglare layer The total amount of the prepolymer is preferably from 10% by weight to 100% by weight, more preferably from 30% by weight to 100% by weight, still more preferably from 40% by weight to 95% by weight, even more preferably 50% by weight. 95% by weight.

The composition for forming an antiglare layer may further contain a monofunctional monomer. Examples of the monofunctional monomer include ethoxylated o-phenylphenol (meth) acrylate, methoxy polyethylene glycol (meth) acrylate, and phenoxy polyethylene glycol (methyl). Acrylate, 2-ethylhexyl acrylate, lauryl acrylate, isooctyl acrylate, isostearyl acrylate, cyclohexyl acrylate, acrylic acid Ester, benzyl acrylate, 2-hydroxy-3-phenoxy acrylate, propylene thiol Porphyrin, 2-hydroxyethyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, hydroxyethyl acrylamide, and the like.

The above monofunctional monomer may have a hydroxyl group. Examples of the monofunctional monomer having a hydroxyl group include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and 2-hydroxyethyl acrylate. Hydroxyalkyl (meth) acrylate such as -3-phenoxy ester, 1,4-cyclohexane methanol monoacrylate; N-(2-hydroxyethyl)(methyl) acrylamide, N-hydroxyl N-(2-hydroxyalkyl)(methyl) acrylamide such as methacrylamide. Among them, 4-hydroxybutyl acrylate and N-(2-hydroxyethyl) acrylamide are preferred.

The antiglare layer-forming composition may further contain an oligomer of (meth)acrylic acid urethane and/or (meth)acrylic acid urethane. The (meth)acrylic acid urethane can be obtained, for example, by reacting (meth)acrylic acid or a (meth)acrylic acid hydroxyester obtained from a (meth)acrylate with a polyhydric alcohol with a diisocyanate. The oligomer of (meth)acrylic acid urethane and (meth)acrylic acid urethane may be used singly or in combination of plural kinds.

Examples of the (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, and (methyl). Cyclohexyl acrylate and the like.

Examples of the polyhydric alcohol include ethylene glycol, 1,3-propanediol, 1,2-propanediol, diethylene glycol, dipropylene glycol, neopentyl glycol, 1,3-butanediol, and 1,4- Butylene glycol, 1,6-hexanediol, 1,9-nonanediol, 1,10-decanediol, 2,2,4-trimethyl-1,3-pentanediol, 3-methyl -1,5-pentanediol, neopentyl glycol hydroxypivalate, tricyclodecane dimethylol, 1,4-cyclohexanediol, spirodiol, hydrogenated bisphenol A, ethylene oxide Addition of bisphenol A, propylene oxide addition bisphenol A, trimethylolethane, trimethylolpropane, glycerol, 3-methylpentane-1,3,5-triol, pentaerythritol, dipentaerythritol , three pentaerythritol, glucose, and the like.

As the diisocyanate, for example, various diisocyanates of an aromatic, aliphatic or alicyclic group can be used. Specific examples of the diisocyanate include tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 2,4-toluene diisocyanate, and 4,4-diphenyl diisocyanate. 1,5-naphthalene diisocyanate, 3,3-dimethyl-4,4-diphenyl diisocyanate, xylene diisocyanate, trimethylhexamethylene diisocyanate, 4,4-diphenylmethane Isocyanate, and such hydrides and the like.

As described above, the anti-glare layer contains particles. By including the particles, the surface of the antiglare layer can be made into an uneven surface. Further, the haze value of the antiglare layer can be controlled. Examples of the particles include inorganic particles and organic particles. Specific examples of the inorganic particles include cerium oxide particles, titanium oxide particles, alumina particles, zinc oxide particles, tin oxide particles, calcium carbonate particles, barium sulfate particles, talc particles, kaolin particles, and calcium sulfate particles. Specific examples of the organic particles include polymethyl methacrylate resin particles (PMMA particles), polyfluorene oxide resin particles, polystyrene resin particles, polycarbonate resin particles, acrylic styrene resin particles, and benzo. The guanamine resin particles, the melamine resin particles, the polyolefin resin particles, the polyester resin particles, the polyamide resin particles, the polyimine resin particles, the polyvinyl fluoride resin particles, and the like. The above particles may be used singly or in combination of plural kinds.

The weight average particle diameter of the particles is preferably from 1 μm to 10 μm, more preferably from 2 μm to 7 μm. When it is such a range, an anti-glare film which is more excellent in anti-glare property and can prevent white blur can be obtained. The weight average particle diameter of the particles can be measured by the Coulter counter method. Further, in the antiglare layer or the antiglare layer-forming composition, the particles may be present in the form of primary particles and/or primary particles, and in the present specification, The weight average particle diameter of the sub-particles refers to the weight average particle diameter measured by the Coulter counter method for the particles in the anti-glare layer-forming composition regardless of the particle morphology.

The ratio of the thickness of the antiglare layer to the weight average particle diameter of the particles (the weight average particle diameter of the particles / the thickness of the antiglare layer) is preferably from 0.3 to 0.9, more preferably from 0.35 to 0.8. If it is such a range, the anti-glare layer which has a glare suppression effect can be formed.

The refractive index n1 of the above particles is preferably from 1.1 to 1.9, more preferably from 1.2 to 1.7. Examples of the particles having such a refractive index n1 include polyfluorene oxide particles, polystyrene particles, polymethyl methacrylate, and copolymers of styrene and methacrylic acid. Further, the difference (n1 - n2) between the refractive index (n1) of the particles and the refractive index (n2) of the binder resin is preferably 0.5 or less, more preferably 0.3 or less. Further, the lower limit of (n1-n2) is preferably -0.9 or more, more preferably -0.8 or more. If it is such a range, an anti-glare layer having a better external haze can be formed. Further, the ratio (n1/n2) of the refractive index (n1) of the particles to the refractive index (n2) of the binder resin is preferably 0.8 to 1.2, more preferably 0.9 to 1.1. When it is such a range, an anti-glare film which is excellent in transparency and glare suppression effect can be obtained. Further, in the case of including a plurality of kinds of particles, the "refractive index of particles (n1)" is an average refractive index of a plurality of kinds of particles, for example, containing particles A (refractive index: na, weight ratio: x), particles In the case of B (refractive index: nb, weight ratio: y) and/or particle C (refractive index: nc, weight ratio: z), "the refractive index n1 of the particle" is based on n1 = na × x + nb × y The equation of +nc×z is obtained (where 0≦x, y, z≦1, and x+y+z=1).

The shape of the particles is not particularly limited, and may be, for example, a substantially spherical shape such as a bead shape, or may be an irregular shape such as a powder. It is preferably a substantially spherical particle having an aspect ratio of 1.5 or less, more preferably a spherical particle.

In the antiglare layer, the content ratio of the particles is preferably 0.2 parts by weight to 12 parts by weight, more preferably 0.5 parts by weight to 12 parts by weight, even more preferably 1 part by weight, per 100 parts by weight of the binder resin. 7 parts by weight. When it is such a range, an anti-glare film which is more excellent in anti-glare property and can prevent white blur can be obtained.

In the composition for forming an antiglare layer, the particles preferably have good dispersibility (in a state where aggregation is small). The dispersibility (degree of dispersion) of the particles can be evaluated by particle size distribution measurement using a laser diffraction scattering type particle size distribution measurement method, a dynamic light scattering method, or a static light scattering method. Further, the measurement can be carried out by microscopic observation using a scanning electron microscope or the like.

In the case where the dispersibility of the particles in the composition for forming an antiglare layer is evaluated by the particle size distribution of the laser diffraction scattering particle size distribution measurement method, D ₅₀ (particle diameter at a volume accumulation of 50%), The absolute value of the difference from the volume cumulative particle diameter D ₉₀ (particle diameter when the volume is accumulated by 90%) is preferably 5 μm or less, more preferably less than 3 μm, still more preferably less than 1 μm, and particularly preferably 0 μm or more. Up to 1μm. If it is such a range, an anti-glare layer having an appropriate surface shape can be formed. If it is such a range, an anti-glare layer having an appropriate surface shape can be formed.

In the case where the dispersibility of the particles in the composition for forming an antiglare layer is evaluated by the particle size distribution of the laser diffraction scattering particle size distribution measurement method, the content ratio of the particles of 1 μm or more and less than 5 μm is relative to The total amount of the particles in the composition is preferably more than 50% by weight, more preferably 70% by weight or more, still more preferably 80% by weight to 100% by weight. If it is such a range, an anti-glare layer having an appropriate surface shape can be formed.

The composition for forming an antiglare layer may further contain a coagulating filler. That is, the antiglare layer may further contain a coagulating filler. By agglomerating the cohesive filler, the uneven shape of the surface of the antiglare layer can be more tightly controlled. More specifically, the aggregation state of the above-mentioned cohesive filler can be adjusted, and the uneven surface of a preferred shape can be easily obtained. The state of aggregation of the cohesive filler may be based on the nature of the filler (e.g., chemical modification state of the surface, affinity to the binder resin, affinity for the solvent contained in the composition for forming an antiglare layer), and formation of an antiglare layer. The adjustment is carried out by the type of the solvent contained in the composition or the like.

Examples of the coagulating filler include organic clay, oxidized polyolefin, and modified urea. Among them, organic clay is preferred.

Examples of the organic clay include bentonite, talc, bentonite, montmorillonite, and kaolinite. Among them, bentonite is preferred. Commercially available products can also be used as the organic clay. As an organic clay which is a commercial item, the brand name "Lucentite SAN" by the Co-op Chemical company, the brand name "Lucentite STN", the brand name "Lucentite SEN", the brand name "Lucentite SPN", and the product name are mentioned, for example. Somasif ME-100", trade name "Somasif MAE", trade name "Somasif MTE", trade name "Somasif MEE", trade name "Somasif MPE"; trade name "S-BEN" manufactured by Ho Jun, "product name" S-BEN C", trade name "S-BEN E", trade name "S-BEN W", trade name "S-BEN P", trade name "S-BEN WX", trade name "S-BEN N-" 400", trade name "S-BEN NX", trade name "S-BEN NX80", trade name "S-BEN NO12S", trade name "S-BEN NEZ", trade name "S-BEN NO12", trade name "S-BEN NE", trade name "S-BEN NZ", trade name "S-BEN NZ70", trade name "Olga Knight", trade name "Olga Knight D", trade name "Olga Knight T"; KUNIMINE INDUSTRIES The company's trade name is "Kunipia F", the trade name "Kunipia G", the trade name "Kunipia G4"; Rockwood Additives The product name is "Tixogel VZ", the product name "CLAYTONE HT", and the product name "CLAYTONE 40".

For example, the product name "Disparlon 4200-20" manufactured by Kusumoto Kasei Co., Ltd., and the product name "FLOWNON SA300" manufactured by Kyoei Kogyo Co., Ltd., and the like are exemplified.

The above modified urea is a reaction product of an isocyanate monomer or an addition object thereof and an organic amine. The modified urea is, for example, a product name "BYK410" manufactured by BYK Corporation.

The content ratio of the coagulating filler is preferably 0.2 parts by weight to 5 parts by weight, more preferably 0.4 parts by weight to 4 parts by weight, per 100 parts by weight of the above-mentioned binder resin.

The composition for forming an antiglare layer preferably contains any appropriate photopolymerization initiator. Examples of the photopolymerization initiator include 2,2-dimethoxy-2-phenylacetophenone, acetophenone, benzophenone, xanthone, and 3-methylacetophenone. 4-chlorobenzophenone, 4,4'-dimethoxybenzophenone, benzoin propyl ether, benzoin dimethyl ketal, N, N, N', N'-tetramethyl-4 , 4'-diaminobenzophenone, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one, 9-oxosulfur A compound or the like.

The antiglare layer-forming composition may or may not contain a solvent. The composition for forming an antiglare layer preferably contains a solvent. Examples of the solvent include alcohols such as methanol, ethanol, isopropanol, butanol, and 2-methoxyethanol; and ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclopentanone; Esters such as methyl acetate, ethyl acetate and butyl acetate; ethers such as diisopropyl ether and propylene glycol monomethyl ether; glycols such as ethylene glycol and propylene glycol; and solubilized fibers such as ethyl cellosolve and butyl cellulolytic Ordinary; aliphatic hydrocarbons such as hexane, heptane, and octane; aromatic hydrocarbons such as benzene, toluene, and xylene. These may be used singly or in combination of plural kinds. In the case of using the composition for forming an antiglare layer containing the above organic clay, it is preferred to use toluene, cyclopentanone, and/or xylene as a solvent.

In one embodiment, as the solvent, a mixed solvent containing cyclopentanone and/or methyl ethyl ketone (for example, a mixed solvent containing cyclopentanone and toluene, and a mixed solvent containing methyl ethyl ketone and toluene) can be used. ). When such a mixed solvent is used, the thickness of the intermediate layer can be adjusted according to the content ratio of cyclopentanone or methyl ethyl ketone. The content ratio of cyclopentanone or methyl ethyl ketone in the mixed solvent is preferably from 1% by weight to 50% by weight, and more preferably from 3% by weight to 50% by weight based on the total amount of the mixed solvent. Further, a mixed solvent of cyclopentanone and toluene is preferred, and a mixed solvent having a cyclopentanone content of from 1% by weight to 50% by weight can be used. When a composition for forming an antiglare layer containing such a mixed solvent is used, an intermediate layer having a desired thickness can be formed on a resin film (for example, a triacetonitrile cellulose film) which is suitable as a transparent substrate of the antiglare film. And an anti-glare layer is formed.

In one embodiment, the SP (Solubility Parameter) value of the solvent is preferably 7 to 12 (cal/cm ³ ) ^1/2 , more preferably 8 to 11 (cal/cm ³ ) ^1/2 . If it is such a range, an intermediate layer of a preferable thickness can be formed on the resin film (for example, the triethylcellulose film) which is suitable as a transparent substrate of an anti-glare film, and an anti-glare layer can be formed. Furthermore, the SP value is a solubility parameter calculated by the formula of Small. The calculation of the SP value can be carried out by a method described in a well-known literature (for example, Journal of Applied Chemistry, 3, 71, 1953., etc.). Further, when the solvent is a mixed solvent, the SP value of the mixed solvent can be calculated based on the molar fraction of each solvent constituting the mixed solvent.

The solid content concentration of the antiglare layer-forming composition is preferably 20% by weight to 80% by weight, more preferably 25% by weight to 60% by weight, still more preferably 30% by weight to 50% by weight. If it is such a range, the uneven surface of a preferable shape can be obtained, and external haze can be adjusted suitably.

The composition for forming an antiglare layer may further contain any appropriate additive. As the additive, for example, a leveling agent, an anti-blocking agent, a dispersion stabilizer, a thixotropic agent, an antioxidant, an ultraviolet absorber, an antifoaming agent, a tackifier, a dispersing agent, a surfactant, a catalyst, and a lubricating agent are mentioned. Agent, antistatic agent, etc.

The antiglare layer can be obtained by applying the composition for forming an antiglare layer to a transparent substrate and then curing it. As a coating method of the composition for forming an antiglare layer, any appropriate method can be employed. For example, a bar coating method, a roll coating method, a gravure coating method, a bar coating method, a slit coating method, a curtain coating method, a spray coating method, and a corner wheel coating method are mentioned. Bufa.

Furthermore, in one embodiment, after the composition for forming an anti-glare layer is applied to a transparent substrate, the transparent substrate on which the coating layer is formed is tilted or before the curing (or curing treatment) Rotate. When the anti-glare layer-forming composition contains a coagulating filler, by performing such an operation, the coagulating fillers can be promoted to contact each other, and the coagulating filler can be appropriately aggregated (sheared and aggregated). For example, the cohesive state of the cohesive filler can be controlled by adjusting the inclination or rotation speed at the time of the above inclination or rotation.

As the curing method of the composition for forming an antiglare layer, any appropriate curing treatment can be employed. The hardening treatment is typically carried out by ultraviolet irradiation. The cumulative amount of light by ultraviolet irradiation is preferably from 50 mJ/cm ² to 500 mJ/cm ² .

C. Transparent substrate

The transparent substrate described above may be formed of a resin film. As the transparent substrate (resin film), any suitable substrate (resin film) can be used as long as it has visible light transmittance. Examples of the material constituting the transparent substrate (resin film) include triacetyl cellulose (TAC), polycarbonate, acrylic polymer, and cyclic polyolefin. A polyolefin structure, polyethylene terephthalate or the like.

The thickness of the transparent substrate is preferably from 10 μm to 500 μm, more preferably from 20 μm to 300 μm, still more preferably from 30 μm to 100 μm. Further, in the case where an intermediate layer is not formed on the antiglare film, the thickness of the transparent substrate corresponds to the thickness of the above resin film. Further, in the case where an intermediate layer is formed on the antiglare film, the thickness of the transparent substrate corresponds to the thickness of the portion of the resin film where the intermediate layer is not formed.

The SP value of the resin constituting the resin film is preferably 10 (cal/cm ³ ) ^1/2 or more, more preferably 15 (cal/cm ³ ) ^1/2 or more, and still more preferably 20 (cal/cm ³ ). ^1/2 or more. If it is such a range, an intermediate layer of a suitable thickness can be formed. The upper limit of the SP value of the resin is, for example, 30 (cal/cm ³ ) ^1/2 or less, preferably 28 (cal/cm ³ ) ^1/2 or less, more preferably 25 (cal/cm ³ ) ^1/2 or less. . In one embodiment, the difference between the SP value of the solvent contained in the composition for forming an antiglare layer and the SP value of the resin constituting the resin film (resin SP value - solvent SP value) is preferably -10 to 20 (cal / cm ^{3) 1/2,} more preferably ^{5 ~ 20 (cal / cm 3} ) 1/2, is ^{10 ~ 15 (cal / cm 3} ) 1/2.

The refractive index of the transparent substrate is preferably from 1.30 to 1.80.

D. Middle layer

As described above, an intermediate layer may be formed between the transparent substrate and the antiglare layer.

The thickness of the intermediate layer (thickness b in Fig. 2) is preferably 0.1% to 123% with respect to the thickness of the antiglare layer (thickness a in Fig. 2). The lower limit of the ratio of the thickness of the intermediate layer to the thickness of the above-mentioned antiglare layer is preferably 1%, more preferably 3%. Further, the upper limit of the ratio of the thickness of the intermediate layer to the thickness of the antiglare layer is preferably 100%, more preferably 85%, and further preferably 65%. Further, the thickness of the intermediate layer, the antiglare layer, and the transparent substrate can be observed by a microscope (for example, TEM (Transmission Electron Microscope)), and the intermediate layer and the resin layer and the adhesive are specified. The interface was measured and the layer was measured. Specific methods of analysis (eg, time-of-flight secondary ion mass spectrometry) can also be used for the interface.

In the present invention, by controlling the ratio to the above ratio so that the thickness of the intermediate layer formed when the antiglare layer is formed is not excessively thick, an antiglare film having a higher glare suppressing effect can be obtained. The antiglare film of the present invention exhibits an excellent glare suppressing effect even when applied to a high definition image display device. Further, the antiglare film of the present invention is less likely to cause glare even if the internal haze of the antiglare layer is relatively small, and therefore, it is excellent in transparency. Further, by setting the ratio of the thickness of the intermediate layer to the thickness of the antiglare layer to be 123% or less, an antiglare layer excellent in scratch resistance can be formed.

In addition, by setting the ratio of the thickness of the intermediate layer to the thickness of the antiglare layer to 3% or more (more preferably 10% or more), the particles are excellent in dispersibility (in a state where aggregation is small). As a result of the antiglare layer, an antiglare film capable of suppressing glare can be obtained.

The thickness of the intermediate layer is preferably from 0.1 μm to 30 μm, more preferably from 0.3 μm to 20 μm, still more preferably from 1 μm to 10 μm, still more preferably from 1.5 μm to 5 μm.

D. Image display device

Fig. 3 is a schematic cross-sectional view showing an example of an image display device using the anti-glare film of the present invention. In Fig. 3, a part (view side) of the image display device 200 is shown. The image display device 200 includes an anti-glare film 100 and an image display unit 30. It is preferable that the anti-glare film 100 is disposed such that the transparent substrate 10 is on the image display unit 30 side. Between the anti-glare film 100 and the image display unit 30, any suitable optical member A can be disposed, and a specific gap X is formed between the anti-glare layer 10 and the image display unit 30. Examples of the optical member A include a glass substrate, a polarizing plate, a retardation film, an adhesive layer, and an adhesive layer. Between the anti-glare film 100 and the image display unit 30, a separate optical component may be disposed, and a plurality of optical components may be disposed. , a plurality of optical components.

As the image display unit described above, any appropriate image display unit can be used. For example, when the image display device is a liquid crystal display device, the liquid crystal cell corresponds to an image display unit, and in the case of an organic EL (Electroluminescence) image display device, the organic EL element corresponds to an image display. unit. The liquid crystal cell typically has a pair of substrates and a liquid crystal layer as a display medium disposed between the substrates.

The gap X between the antiglare layer and the image display unit in the antiglare film is preferably from 50 μm to 800 μm. In one embodiment, the gap X of the image display device is 100 μm or more. The anti-glare film of the present invention can also suppress glare when the gap X is large. Further, the gap X between the anti-glare layer and the image display unit in the anti-glare film refers to the back surface of the anti-glare layer (the surface on the image display unit side) and the viewing side of the image display unit (the anti-glare film side) The distance made by the face). Therefore, the gap X corresponds to the total thickness of the optical member A disposed between the anti-glare film 100 and the image display unit 30 (for example, the total thickness of the polarizing plate, the glass substrate, and/or the adhesive layer), and the anti-glare film. The total thickness of the transparent substrate (in the case where the intermediate layer is formed, the transparent substrate and the intermediate layer). Further, when the image display unit is a liquid crystal cell, the distance between the viewing side surface of the viewing side substrate and the back surface of the anti-glare layer provided in the liquid crystal cell is the gap X.

The anti-glare film of the present invention can be suitably used not only for an image display device having a small gap X but also for an image display device having a large gap X (for example, having a relatively thick glass substrate (for example, a thickness of An image display device of a glass substrate of 100 μm to 800 μm). Conventionally, in applications requiring heat resistance, strength, and the like (for example, for vehicle use), heat resistance is improved by thickening a glass substrate. However, the inventors of the present invention have found that as the glass substrate is thickened, that is, as the gap X is thickened, the glare generated when the anti-glare film is applied is increased. That is, the anti-glare film of the present invention can solve the problem and can be suitably used for an image display device for a vehicle. Further, the effect of using the anti-glare film of the present invention becomes more remarkable for a high-definition image display device.

The above image display device may further comprise any suitable member. For example, it may further include a polarizing plate, an optical film, a backlight, or the like provided on the back side of the image display unit.

[Examples]

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

Further, the weight average particle diameter of the particles was measured by a Coulter counter method. Specifically, the composition for forming an antiglare layer is a particle size distribution measuring apparatus (manufactured by Beckman Coulter Co., Ltd., trade name "Coulter Multisizer") using a pore resistance method, and the volume of the particles corresponding to the particle passing through the pores is measured. The electric resistance of the electrolytic solution was used to measure the number and volume of the particles, and the weight average particle diameter was calculated.

In addition, the thickness of each layer was measured by observing the cross section by an optical microscope (manufactured by Keyence Corporation, trade name "VHX-700F") or TEM (manufactured by Hitachi Co., Ltd., trade name "H-7650"). When observed by an optical microscope, the anti-glare film after resin encapsulation was cut by a microtome to prepare a sample for observation. Further, when observed by TEM, a sample was produced by an ultrathin sectioning method including heavy metal dyeing treatment.

Further, the refractive index is obtained by using an Abbe refractometer (trade name: DR-M2/1550) manufactured by Atago Co., Ltd., and selecting monobromophthalene as an intermediate liquid, and measuring light is incident on the measurement surface of the measurement target, and is used in the above apparatus. The measurement method specified in the measurement is carried out.

[Example 1]

50 parts by weight of pentaerythritol triacrylate (manufactured by Osaka Organic Chemical Co., Ltd., trade name "Viscoat #300") as a binder resin and urethane acrylate prepolymer (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name "UA" -53H-80BK") 50 parts by weight of polyfluorene oxide particles (manufactured by Momentive Advanced Materials Japan Co., Ltd., trade name "TOSPEARL 130", weight average particle diameter: 3 μm, refractive index: 1.42) 3.5 parts by weight, as an organic clay 2 parts by weight of synthetic bentonite (trade name "Lucentite SAN" manufactured by Co-op Chemical Co., Ltd.), photopolymerization initiator (manufactured by BASF Corporation, trade name "Irgacure" 907") 3 parts by weight, and a leveling agent (manufactured by DIC Corporation, "PC4100", 10% solid content), 0.2 parts by weight, and a mixed solvent of toluene/cyclopentanone (CPN) (weight ratio 70/) 30) Dilution was carried out to prepare a composition for forming an antiglare layer having a solid content concentration of 35% by weight. Further, the organic clay was diluted and used by using toluene so as to have a solid content of 6% by weight.

The above-mentioned prevention was applied to a triacetyl cellulose film (manufactured by Konica Minolta Opto Co., Ltd., trade name "KC4UA", thickness: 40 μm) as a transparent substrate using a Comma coater (registered trademark). glare layer forming composition was heated for 1 minute, using a high pressure mercury lamp irradiation integrated light quantity of 300mJ / cm ² of ultraviolet rays at 80 ℃, to obtain an antiglare layer is formed (thickness: 6.3μm) on a transparent substrate of an antiglare membrane. Further, an intermediate layer of 1.7 μm was formed between the transparent substrate of the antiglare film and the antiglare layer.

[Embodiment 2]

50 parts by weight of pentaerythritol triacrylate (manufactured by Osaka Organic Chemical Co., Ltd., trade name "Viscoat #300") as a binder resin and urethane acrylate prepolymer (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name "UA" -53H-80BK") 50 parts by weight of polyfluorene oxide particles (manufactured by Momentive Advanced Materials Japan Co., Ltd., trade name "TOSPEARL 130", weight average particle diameter: 3 μm, refractive index: 1.42), 1.7 parts by weight, polystyrene Particle (manufactured by Sekisui Kogyo Seisakusho Co., Ltd., trade name "Techpolymer", weight average particle diameter: 3 μm, refractive index: 1.59) 2.3 parts by weight, synthetic bentonite as organic clay (manufactured by Co-op Chemical Co., Ltd., trade name "Lucentite" SAN") 2 parts by weight, a photopolymerization initiator (manufactured by BASF Corporation, trade name "Irgacure 907"), 3 parts by weight, and a leveling agent (manufactured by DIC Corporation, trade name "PC4100", solid content 10%) 0.2 The components were mixed in a weight ratio of toluene/cyclopentanone (CPN) mixed solvent (weight ratio: 70/30) to prepare an antiglare layer-forming composition having a solid content concentration of 35 wt%. Further, the organic clay was diluted and used by using toluene so as to have a solid content of 6% by weight.

The above-mentioned antiglare layer was formed by using a notched wheel coater (registered trademark) on a triacetyl cellulose film (manufactured by Konica Minolta Opto Co., Ltd., trade name "KC4UA", thickness: 40 μm) as a transparent substrate. The composition was heated at 80 ° C for 1 minute, and then an ultraviolet ray having a cumulative light amount of 300 mJ/cm ^{2 was} irradiated with a high pressure mercury lamp to obtain an antiglare film having an antiglare layer (thickness: 6.3 μm) formed on a transparent substrate. Further, an intermediate layer of 1.7 μm was formed between the transparent substrate of the antiglare film and the antiglare layer.

[Comparative Example 1]

5 parts by weight of polystyrene oxide particles (made by Moto High-tech Materials Japan Co., Ltd., using a polystyrene particle (manufactured by Sekisui Kogyo Seisakusho Co., Ltd., trade name "Techpolymer", weight average particle diameter: 3 μm, refractive index: 1.59) An anti-glare film was obtained in the same manner as in Example 1 except that "TOSPEARL 130", weight average particle diameter: 3 μm, refractive index: 1.42) and 3.5 parts by weight.

[Comparative Example 2]

The blending amount of synthetic bentonite (manufactured by Co-op Chemical Co., Ltd., trade name "Lucentite SAN") as organic clay was set to 1.85 parts by weight, and the solid content concentration of the composition for forming an antiglare layer was set to 36 weight. An anti-glare film was obtained in the same manner as in Comparative Example 1, except for the above.

[Comparative Example 3]

100 parts by weight of urethane urethane (manufactured by DIC Corporation, trade name "UNIDIC 17-806") as a binder resin, and polystyrene particles (manufactured by Soken Chemical Co., Ltd., trade name "SX-350H", weight average Particle size: 3.5 μm, refractive index: 1.59) 15 parts by weight, photopolymerization initiator (manufactured by BASF Corporation, trade name "Irgacure 907"), 3 parts by weight, and leveling agent (manufactured by DIC Corporation, trade name "PC4100" , the solid content component (10%) was mixed in an amount of 0.2 parts by weight, and diluted with a toluene/cyclopentanone (CPN) mixed solvent (weight ratio of 70/30) to prepare a combination for forming an antiglare layer having a solid content concentration of 32% by weight. Things. Further, the organic clay was diluted and used by using toluene so as to have a solid content of 6% by weight.

The above-mentioned antiglare layer was formed by using a notched wheel coater (registered trademark) on a triacetyl cellulose film (manufactured by Konica Minolta Opto Co., Ltd., trade name "KC4UA", thickness: 40 μm) as a transparent substrate. The composition was heated at 80 ° C for 1 minute, and then an ultraviolet ray having a cumulative light amount of 300 mJ/cm ^{2 was} irradiated with a high pressure mercury lamp to obtain an antiglare film having an antiglare layer (thickness: 6.3 μm) formed on a transparent substrate.

[Comparative Example 4]

Porous cerium oxide particles (manufactured by Fuji Silysia Chemical Co., Ltd., trade name "SYLOPHOBIC 702", weight average particle diameter: 2.5 μm, refractive index: 1.46), 1.56 parts by weight and porous cerium oxide particles (manufactured by Fuji Silysia Chemical Co., Ltd.) , the product name "SYLOPHOBIC 100", weight average particle diameter: 1.4 μm, refractive index: 1.46) 1.35 parts by weight in place of polystyrene particles (manufactured by Amika Chemical Co., Ltd., trade name "SX-350H", weight average particle diameter: 3.5 μm An anti-glare film was obtained in the same manner as in Comparative Example 3 except that the refractive index of the composition of the anti-glare layer-forming composition was changed to 48% by weight.

[Comparative Example 5]

In place of polystyrene particles (manufactured by Fuji Silysia Chemical Co., Ltd., trade name "SYLOPHOBIC 100", weight average particle diameter: 1.4 μm, refractive index: 1.46), 11.6 parts by weight. "SX-350H", weight average particle diameter: 3.5 μm, refractive index: 1.59) 15 parts by weight, and the solid content concentration of the antiglare layer-forming composition was 42% by weight, and other comparisons were made. An anti-glare film was obtained in the same manner as in Example 3.

[Comparative Example 6]

The amount of polyfluorene oxide particles (manufactured by Momentive Advanced Materials Japan Co., Ltd., trade name "TOSPEARL 130", weight average primary particle diameter: 3 μm, refractive index: 1.42) was set to 1.6 parts by weight, and polystyrene was used. The amount of particles (manufactured by Sekisui Chemicals Co., Ltd., trade name "Techpolymer", weight average particle diameter: 3 μm, refractive index: 1.59) An anti-glare film was obtained in the same manner as in Example 2 except that the amount was 2.4 parts by weight.

<evaluation>

The antiglare films obtained in the examples and the comparative examples were supplied to the following evaluations. The results are shown in Table 1.

1. Shape of the surface of the anti-glare layer (Ra, Sm, θa)

The average inter-convex distance Sm (mm) and the arithmetic mean surface roughness Ra (μm) were measured in accordance with JIS B0601 (1994 edition). Specifically, the glass plate is bonded to the side of the transparent substrate of the anti-glare film opposite to the anti-glare layer (manufactured by MATSUNAMI, MICRO SLIDE GLASS, model S, thickness 1.3 mm, 45×50 mm) And make a sample. A stylus type surface roughness measuring instrument (manufactured by Kosaka Research Co., Ltd., high-precision fine shape measuring instrument, trade name "Surfcorder ET4000") having a measuring probe having a radius of curvature R = 2 μm at the tip end portion (diamond) The surface shape of the antiglare layer in the above sample was measured in a certain direction under the conditions of a scanning speed of 0.1 mm/sec, a critical value of 0.8 mm, and a measurement length of 4 mm, and the average inter-convex distance Sm (mm) and the arithmetic mean surface were obtained. Roughness Ra. Further, the average inclination angle θa (°) was obtained from the obtained surface roughness curve. Further, the high-precision fine shape measuring device automatically calculates the respective measured values.

2, the overall haze

The haze was measured by a haze meter (manufactured by Murakami Color Research Laboratory, trade name "HM-150") according to the haze of JIS K 7136 (2000).

3. Internal haze and external haze

On the surface of the anti-glare layer of the anti-glare film (the side opposite to the transparent substrate), an evaluation sample is obtained by laminating a triacetyl cellulose (TAC) film, and the evaluation test is performed by the method of the above (2). The haze value, and the value obtained is set to the internal haze.

The value obtained by subtracting the internal haze from the overall haze is set as the external haze.

4, glare evaluation (Evaluation when the gap is X=60μm)

A glass plate (thickness: 700 μm) was placed on a backlight (manufactured by HAKUBA Photo Industry, trade name "Light Viewer 5700"), and a black matrix pattern was placed on the surface of the glass plate opposite to the backlight to prepare an evaluation table. .

On the evaluation stage, an adhesive layer (thickness: 20 μm) was placed as the member A constituting one of the gaps X.

The antiglare film obtained in the examples and the comparative examples was placed on the member A with the transparent substrate facing downward (that is, the adhesive layer and the transparent substrate were opposed). This configuration is a configuration in which the glare is evaluated when the gap X is 60 μm (= 20 μm of the adhesive layer + 40 μm of the transparent substrate and the intermediate layer).

Then, the anti-glare film was irradiated with light, and the glare generated in the anti-glare film was evaluated by the following criteria.

Further, the definition of the black matrix pattern was set to 105 ppi, 200 ppi, and 267 ppi, and the above-described evaluation was performed for each sharpness.

○: almost no glare

△: Although there is glare, it is practically no problem.

×: visible glare in practical problems

(Evaluation when the gap X=500μm)

The evaluation stage is prepared in the same manner as described above.

Four layers of a TAC film (thickness: 80 μm) and four layers of an adhesive layer (thickness: 20 μm) were alternately laminated on the evaluation stage as a member A constituting one part of the gap X, and a TAC film (thickness: 40 μm) was laminated. With adhesive layer (thickness: 20μm).

The antiglare film obtained in the examples and the comparative examples was placed on the member A with the transparent substrate facing downward (that is, the adhesive layer and the transparent substrate were opposed). In addition, such a configuration is a configuration of glare when the evaluation gap X is 500 μm (= TAC 80 μm × 4 + TAC 40 μm × 1 + adhesive layer 20 μm × 5 + total thickness of the transparent substrate and the intermediate layer 40 μm).

With this configuration, the same evaluation as described above is performed.

(Evaluation when the gap is X=800μm)

The evaluation stage is prepared in the same manner as described above.

On the evaluation stage, 7 layers of a TAC film (thickness: 80 μm) and 7 layers of an adhesive layer (thickness: 20 μm) were alternately laminated as a member A constituting a part of the gap X, and a TAC film (thickness: 40 μm) was laminated. With adhesive layer (thickness: 20μm).

The antiglare film obtained in the examples and the comparative examples was placed on the member A with the transparent substrate facing downward (that is, the adhesive layer and the transparent substrate were opposed). This configuration is a configuration in which the glare is evaluated when the gap X is 800 μm (= TAC 80 μm × 7 + TAC 40 μm × 1 + adhesive layer 20 μm × 8 + total thickness of the transparent substrate and the intermediate layer: 40 μm).

With this configuration, the same evaluation as described above is performed.

5, white blur

On the side of the transparent substrate opposite to the antiglare layer, a black acrylic plate (manufactured by Mitsubishi Rayon Co., Ltd., thickness: 2 mm) was bonded to the surface of the transparent substrate to prepare an evaluation sample for suppressing the influence of back reflection.

In the environment of illuminance 1000Lx (equivalent to the normal office environment using the display), the vertical direction is set as the reference (0°) with respect to the upper surface of the evaluation sample, and the white blur is observed by visual observation from the direction of 60°. The degree of the phenomenon was evaluated by the following evaluation criteria.

○: No white blur

△: White blurring that shows less influence on visibility

×: It is visible that the white blur is deeper as the visibility is significantly lowered.

6, anti-glare

An evaluation sample was prepared by laminating a black acrylic plate (manufactured by Mitsubishi Rayon Co., Ltd., thickness: 2 mm) on the side opposite to the antiglare layer of the transparent substrate, and suppressing the influence of back reflection.

The evaluation sample was irradiated with a fluorescent lamp (three-wavelength light source) in an environment of an illumination of 1000 Lx (corresponding to a normal office environment using a display), and the anti-glare film was evaluated for anti-glare by visual inspection by the following evaluation criteria. Sex.

○: The image of the outline of the fluorescent lamp that has not been reflected is excellent in anti-glare

×: The outline of the fluorescent lamp is reflected in the image, and the anti-glare is poor.

As is clear from Table 1, the antiglare film of the present invention can suppress glare regardless of the thickness of the member disposed on the back side, and is excellent in transparency and antiglare property. Moreover, this effect can also be exhibited in a high definition image display device.

10‧‧‧Transparent substrate

20‧‧‧Anti-glare layer

100‧‧‧Anti-glare film

Claims (8)

An anti-glare film comprising: a transparent substrate; and an anti-glare layer disposed on at least one side of the transparent substrate, and having an external haze of -5% to 0.7%. The anti-glare film of claim 1 has an overall haze of 5% to 40%. The anti-glare film of claim 1 or 2 has an internal haze of 10% to 40%. The anti-glare film according to any one of claims 1 to 3, wherein a surface of the anti-glare layer opposite to the transparent substrate is an uneven surface, and an average interval Sm of the unevenness in the uneven surface, an average tilt angle The arithmetic mean surface roughness of θa and the uneven surface shows a relationship of Ra0≦Ra/Sm×θa×1000≦2. The anti-glare film according to any one of claims 1 to 4, wherein the anti-glare layer comprises a binder resin and particles, and a difference between a refractive index n1 of the particles and a refractive index n2 of the binder resin (n1-n2) It is 0.5 or less. The anti-glare film according to any one of claims 1 to 5, wherein the anti-glare layer comprises a cohesive filler. The anti-glare film of claim 6, wherein the coagulating filler is an organic clay. The anti-glare film according to any one of claims 1 to 7, further comprising: formed between the transparent substrate and the anti-glare layer, and comprising at least a part of a material constituting the transparent substrate and/or the adhesive An intermediate layer of at least a portion of the resin, and the thickness of the intermediate layer is from 0.1% to 123% with respect to the thickness of the antiglare layer.