JP2015057655A - Antiglare hard coat film, polarizing plate and image display device using the same, and method for manufacturing antiglare hard coat film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antiglare hard coat film, a polarizing plate, and the like, having an extremely low haze and excellent antiglare property, preventing white blur and capable of improving depth of a black color in a black display mode.SOLUTION: The antiglare hard coat film has an antiglare hard coat layer containing fine particles on at least one surface of a transparent plastic film substrate, and has a total haze value of 0 to 5%. In a surface roughness profile along any 4-mm line on a surface of the antiglare hard coat layer, the number Nof projections exceeding a first reference line which is parallel to a roughness average line of the roughness profile and is located at a height of 0.1 μm from the average line, is 15 or more; Nand a number Nsatisfy 0.4≤N/N≤0.8, where the number Nis the number of projections exceeding the first reference line and having a length of 50 μm or more of a line segment that crosses the average line; and the number of projections exceeding a second reference line that is located at a height of 0.2 μm from the average line, and having a length of 50 μm or less of a line segment crossing the average line, is 10 or less.

Description

  The present invention relates to an antiglare hard coat film, a polarizing plate and an image display device using the same, and a method for producing an antiglare hard coat film.

  Anti-glare hard coat film reflects external light in various image display devices such as cathode ray tube display (CRT), liquid crystal display (LCD), plasma display panel (PDP), and electroluminescence display (ELD). In order to prevent a decrease in contrast due to reflection of images and images, it is arranged on the display surface. In recent years, high image quality and high contrast have been promoted in LCDs, particularly television applications. One of the causes of LCD contrast reduction is the influence of the haze value of the antiglare hard coat film disposed on the surface. Therefore, in order to further increase the contrast, an antiglare hard coat film having a low haze value has been demanded.

  In the conventional antiglare hard coat film having a relatively high haze value, there is almost no difference in the degree of reflection of the fluorescent light and the reflection of the face. A fluorescent lamp is a direct image of light and is a simple image with a strong light quantity, and the anti-glare property is judged by whether or not the outline image of the image is clearly visible to the human naked eye. On the other hand, the reflection of the face is a reflection of indirect light, which is a complex image with a low light intensity. In this case, the human eye determines the anti-glare property based on the degree of blurring of the entire image. However, in order to realize a low haze value, it is difficult to design an anti-glare hard coat film that suppresses the anti-glare property to the extent that both of the above-mentioned two types of reflection represented by a fluorescent lamp and a face are compatible. Met. Also, if the surface irregularities are greatly roughened in order to improve anti-glare properties while maintaining low haze, the so-called diagonal white blur in which the reflected light appears too blurred when viewed from an oblique direction is seen. There is a problem. The improvement in anti-glare property and the improvement in white blur and contrast are generally considered to be in a contradictory relationship, but various proposals have been made to achieve both of these characteristics. For example, studies have been made to allow a three-dimensional three-dimensional structure agglomeration formed from the particles to exist in the antiglare layer (see, for example, Patent Documents 1 to 3), and to define the uneven shape on the outermost surface. Although studies have been made to achieve both prevention of reflection and prevention of white blurring (see, for example, Patent Documents 4 and 5), these are only considered for reflection of fluorescent lamps. However, no consideration has been given to the reflection of the face and the prevention of both reflections.

JP 2005-316413 A JP 2007-264113 A JP 2007-249191 A International Publication No. 2006/0088202 JP 2009-98657 A

  Therefore, the present invention has an object to provide an antiglare hard coat film that improves visibility without deteriorating the characteristics of an image display device such as an LCD such as a television or a monitor (especially those having a pixel number of 140 ppi or less). And That is, an anti-glare hard coat film that has extremely low haze, has excellent fluorescent light and anti-glare properties on the face, and can improve whiteness when displaying black by preventing white blurring. Another object of the present invention is to provide a polarizing plate and an image display device using the same, and a method for producing the antiglare hard coat film.

To achieve the above object, the antiglare hard coat film of the present invention is an antiglare hard coat film having an antiglare hard coat layer containing fine particles on at least one surface of a transparent plastic film substrate. And the total haze value of the antiglare hard coat film is in the range of 0 to 5%,
The convex portion exceeding the first reference line located at a height of 0.1 μm parallel to the roughness average line of the surface roughness profile at a length of 4 mm at an arbitrary location on the surface of the antiglare hard coat layer. The number N _total is 15 or more,
And when the number of convex portions that exceed the first reference line and the length of the line segment that crosses the convex portion of the average line is 50 μm or more is N ₅₀ , N _total and N ₅₀ satisfy the relationship of the following formula (1),
And the convex part which the length of the line segment of the part which cross | intersects the said average line is 50 micrometers or less among the convex parts exceeding the 2nd reference line located in the height of 0.2 micrometer parallel to the said average line The number of is 10 or less.
0.4 ≦ N ₅₀ / N _total ≦ 0.8 (1)

  The polarizing plate of the present invention is a polarizing plate having a polarizer and an antiglare hard coat film, wherein the antiglare hard coat film is the antiglare hard coat film of the present invention. .

  The image display device of the present invention is an image display device provided with an antiglare hard coat film, wherein the antiglare hard coat film is the antiglare hard coat film of the present invention.

  The image display device of the present invention is an image display device including a polarizing plate, wherein the polarizing plate is the polarizing plate of the present invention.

The method for producing an antiglare hard coat film of the present invention is a method for producing the antiglare hard coat film of the present invention,
Preparing the fine particles, the hard coat layer forming material, and the antiglare hard coat layer forming material containing a solvent;
Coating the antiglare hard coat layer forming material on at least one surface of the transparent plastic film substrate to form a coating film;
Curing the coating film to form the antiglare hard coat layer,
As the solvent, a solvent having an alcohol solvent ratio of 50% by weight or more is used.

  According to the antiglare hard coat film of the present invention, for example, in a liquid crystal panel such as a television or a monitor (particularly, those having a pixel number of 140 ppi or less), the antiglare property of a fluorescent lamp is realized by realizing a characteristic uneven shape. And anti-glare properties of the face, and can prevent white blur. Further, by reducing the haze, it is possible to improve the darkness of black when the image display apparatus displays black in a dark room environment. Therefore, the image display apparatus using the antiglare hard coat film or polarizing plate of the present invention has excellent display characteristics.

FIG. 1A is a profile showing a cross-sectional surface shape of the antiglare hard coat film of Example 1 in a range of 0 to 1 mm in a measurement length of 4 mm. FIG. 1B is a profile showing a cross-sectional surface shape of the antiglare hard coat film of Example 1 in a range of 1 to 2 mm out of a measurement length of 4 mm. FIG.1 (c) is the profile which showed the range of 2-3 mm among the measurement length 4mm of the cross-sectional surface shape of the glare-proof hard coat film of Example 1. FIG. FIG.1 (d) is the profile which showed the range of 3-4 mm among the measurement length 4mm of the cross-sectional surface shape of the glare-proof hard coat film of Example 1. FIG. FIG. 2 is a profile having a measurement length of 4 mm of the cross-sectional surface shape of the antiglare hard coat film of Example 2. (A) is in the range of 0-1 mm, (b) is in the range of 1-2 mm, (c) is in the range of 2-3 mm, and (d) is in the range of 3-4 mm. FIG. 3 is a profile having a measurement length of 4 mm of the cross-sectional surface shape of the antiglare hard coat film of Example 3. (A) is in the range of 0-1 mm, (b) is in the range of 1-2 mm, (c) is in the range of 2-3 mm, and (d) is in the range of 3-4 mm. FIG. 4 is a profile having a measurement length of 4 mm of the cross-sectional surface shape of the antiglare hard coat film of Example 4. (A) is in the range of 0-1 mm, (b) is in the range of 1-2 mm, (c) is in the range of 2-3 mm, and (d) is in the range of 3-4 mm. FIG. 5 is a profile showing a cross-sectional surface shape of the antiglare hard coat film of Comparative Example 1 in a range of 0 to 1 mm in a measurement length of 4 mm. FIG. 6 is a profile showing the range of 3 to 4 mm of the measured length of 4 mm of the cross-sectional surface shape of the antiglare hard coat film of Comparative Example 2. FIG. 7 is a profile showing the range of 3 to 4 mm of the measured length of 4 mm of the cross-sectional surface shape of the antiglare hard coat film of Comparative Example 3. FIG. 8 is a profile showing the range of 3 to 4 mm of the measured length of 4 mm of the cross-sectional surface shape of the antiglare hard coat film of Comparative Example 4. FIG. 9 is a profile showing a cross-sectional surface shape of the antiglare hard coat film of Comparative Example 5 in a range of 3 to 4 mm out of a measured length of 4 mm. FIG. 10 is a profile showing a range of 0 to 1 mm in a measured length of 4 mm of the cross-sectional surface shape of the antiglare hard coat film of Comparative Example 6. FIG. 11 is a profile showing the range of 3 to 4 mm of the measured length of 4 mm of the cross-sectional surface shape of the antiglare hard coat film of Comparative Example 7. FIG. 12 is a profile showing a range of 3 to 4 mm of the measured length of 4 mm of the cross-sectional surface shape of the antiglare hard coat film of Comparative Example 8.

In the antiglare hard coat film of the present invention, at a measurement area of 595 μm × 452 μm at an arbitrary location on the surface of the antiglare hard coat layer, the height is 0.5 μm parallel to the roughness average surface of the surface roughness profile. The number M _{total of} protrusions exceeding the reference plane is within the range of 40 to 150,
It is preferable that M _total and the number M ₁₀₀ of convex portions having a cross-sectional area of 100 μm ² or more among the convex portions satisfy the relationship of the following formula (2).
0.15 ≦ M ₁₀₀ / M _total ≦ 0.5 (2)

  In the antiglare hard coat film of the present invention, the antiglare hard coat layer is formed using the fine particles and a hard coat layer forming material, and refraction of the hard coat layer forming material and the fine particles. The hard coat layer contains at least one kind of spherical or amorphous fine particles having a difference in rate of 0.001 to 0.02 and a weight average particle size of 0.5 to 8 μm as the fine particles. The fine particles are preferably contained in the range of 2 to 15 parts by weight with respect to 100 parts by weight of the forming material.

  The thickness of the antiglare hard coat layer is preferably in the range of 1.6 to 3 times the weight average particle diameter of the fine particles.

  The thickness of the antiglare hard coat layer is preferably in the range of 3 μm or more and less than 7.5 μm.

  Next, the present invention will be described in detail. However, the present invention is not limited by the following description.

  The antiglare hard coat film of the present invention has an antiglare hard coat layer on at least one surface of a transparent plastic film substrate.

  The transparent plastic film substrate is not particularly limited, but preferably has a visible light transmittance (preferably a light transmittance of 90% or more) and a transparency (preferably a haze value of 1% or less). For example, the transparent plastic film base material of Unexamined-Japanese-Patent No. 2008-90263 is mention | raise | lifted. As the transparent plastic film substrate, those having a small optical birefringence are preferably used. The antiglare hard coat film of the present invention can also be used for a polarizing plate as a protective film, for example. In this case, as the transparent plastic film substrate, triacetyl cellulose (TAC), polycarbonate, acrylic A film formed from a polymer, a polyolefin having a cyclic or norbornene structure, or the like is preferable. In the present invention, as described later, the transparent plastic film substrate may be a polarizer itself. With such a configuration, a protective layer made of TAC or the like is not required, and the structure of the polarizing plate can be simplified. Therefore, the number of manufacturing steps of the polarizing plate or the image display device can be reduced, and the production efficiency can be improved. Moreover, if it is such a structure, a polarizing plate can be made thinner. When the transparent plastic film substrate is a polarizer, the antiglare hard coat layer serves as a conventional protective layer. Moreover, if it is such a structure, when it mounts | wears with the liquid crystal cell surface, for example, an anti-glare hard coat film will serve as a cover plate.

  In the present invention, the thickness of the transparent plastic film substrate is not particularly limited, but is preferably in the range of 10 to 500 μm, more preferably in consideration of workability such as strength and handleability and thin layer properties. Is in the range of 20-300 μm, optimally in the range of 30-200 μm. The refractive index of the transparent plastic film substrate is not particularly limited. The refractive index is, for example, in the range of 1.30 to 1.80, and preferably in the range of 1.40 to 1.70.

  The antiglare hard coat layer is formed using the fine particles and the hard coat layer forming material. Examples of the hard coat layer forming material include a thermosetting resin and an ionizing radiation curable resin that is cured by ultraviolet rays or light. As the hard coat layer forming material, a commercially available thermosetting resin, ultraviolet curable resin, or the like can be used.

  As the thermosetting resin or ultraviolet curable resin, for example, a curable compound having at least one of an acrylate group and a methacrylate group that can be cured by heat, light (such as ultraviolet rays) or electron beam can be used. Silicone resins, polyester resins, polyether resins, epoxy resins, urethane resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, oligomers or prepolymers such as acrylates and methacrylates of polyfunctional compounds such as polyhydric alcohols, etc. can give. These may be used alone or in combination of two or more.

  As the hard coat layer forming material, for example, a reactive diluent having at least one of an acrylate group and a methacrylate group can be used. As the reactive diluent, for example, the reactive diluent described in JP-A-2008-88309 can be used, and includes, for example, monofunctional acrylate, monofunctional methacrylate, polyfunctional acrylate, polyfunctional methacrylate and the like. The reactive diluent is preferably a trifunctional or higher acrylate or a trifunctional or higher methacrylate. This is because the hardness of the antiglare hard coat layer can be made more excellent. Examples of the reactive diluent include butanediol glycerin ether diacrylate, isocyanuric acid acrylate, isocyanuric acid methacrylate, and the like. These may be used alone or in combination of two or more.

  The fine particles for forming the antiglare hard coat layer provide the antiglare property by making the surface of the formed antiglare hard coat layer uneven, and also the haze value of the antiglare hard coat layer. The main function is to control. The haze value of the antiglare hard coat layer can be designed by controlling the refractive index difference between the fine particles and the hard coat layer forming material. Examples of the fine particles include inorganic fine particles and organic fine particles. The inorganic fine particles are not particularly limited, and examples thereof include silicon oxide fine particles, titanium oxide fine particles, aluminum oxide fine particles, zinc oxide fine particles, tin oxide fine particles, calcium carbonate fine particles, barium sulfate fine particles, talc fine particles, kaolin fine particles, calcium sulfate fine particles and the like. Can be given. The organic fine particles are not particularly limited. For example, polymethyl methacrylate resin powder (PMMA fine particles), silicone resin powder, polystyrene resin powder, polycarbonate resin powder, acrylic styrene resin powder, benzoguanamine resin powder, melamine resin powder, polyolefin resin Examples thereof include powder, polyester resin powder, polyamide resin powder, polyimide resin powder, and polyfluorinated ethylene resin powder. These inorganic fine particles and organic fine particles may be used alone or in combination of two or more.

  The weight average particle diameter of the fine particles is preferably in the range of 0.5 to 8 μm. When the weight average particle diameter of the fine particles is larger than the above range, image sharpness is deteriorated. When the fine particle diameter is smaller than the above range, sufficient antiglare property cannot be obtained, and the problem that glare is likely to increase is likely to occur. The weight average particle diameter of the fine particles is more preferably in the range of 2 to 6 μm, and still more preferably in the range of 2 to 5 μm. The weight average particle diameter of the fine particles is preferably in the range of 33 to 62.5% of the thickness of the antiglare hard coat layer. The weight average particle diameter of the fine particles can be measured by, for example, a Coulter counting method. For example, by using a particle size distribution measuring device (trade name: Coulter Multisizer, manufactured by Beckman Coulter, Inc.) using a pore electrical resistance method, the electrolyte solution corresponding to the volume of the particulates when the particulates pass through the pores By measuring the electrical resistance, the number and volume of the fine particles are measured, and the weight average particle diameter is calculated.

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

  The blending ratio of the fine particles is preferably in the range of 2 to 15 parts by weight, more preferably in the range of 4 to 10 parts by weight with respect to 100 parts by weight of the hard coat layer forming material.

  The thickness of the antiglare hard coat layer is preferably in the range of 1.6 to 3 times the weight average particle diameter of the fine particles, more preferably in the range of 1.7 to 2.5 times. Further, the thickness of the antiglare hard coat layer is preferably in the range of 3 μm or more and less than 7.5 μm from the viewpoint of coatability and pencil hardness, and the weight average of the fine particles to be in this thickness range It is preferable to adjust the particle size. If the thickness is within the predetermined range, the surface shape of the antiglare hard coat film of the present invention including large unevenness and small unevenness in a balanced manner in order to achieve both the anti-reflection properties of both the fluorescent lamp and the face. Easy to realize.

  The antiglare hard coat film of the present invention has a total haze value in the range of 0 to 5%. The total haze value is the haze value (cloudiness) of the entire antiglare hard coat film according to JIS K 7136 (2000 version). The total haze value is more preferably in the range of 0.5 to 4%, and still more preferably in the range of 1 to 3%. In order to set the total haze value in the above range, the fine particles and the hard coat layer forming material are set so that the refractive index difference between the fine particles and the hard coat layer forming material is in the range of 0.001 to 0.02. And are preferably selected. When the total haze value is within the above range, a clear image can be obtained and the contrast in a dark place can be improved. If the total haze value is too low, reflection tends to occur.

The antiglare hard coat film of the present invention has a roughness average line of the surface roughness profile in the uneven shape of the antiglare hard coat layer surface at a length of 4 mm at an arbitrary portion of the antiglare hard coat layer surface. And the number N _total of the convex portions exceeding the first reference line located at a height of 0.1 μm is 15 or more, and the convex portions exceeding the first reference line, when the length of the line segment of the portion crossing the convex portion of the average line was the number of convex portions of more than 50μm and _{N 50, N total} and _{N 50} and is _{0.4 ≦ N 50 / N total ≦} 0 .8, and the length of the line segment that crosses the average line out of the convex part that exceeds the second reference line and is located at a height of 0.2 μm parallel to the average line is The number of convex-shaped parts which are 50 micrometers or less is 10 or less.

If the N _total is less than 15, the anti-glare property of the fluorescent lamp and the face is difficult to obtain, which is not preferable. The N _total is preferably in the range of 15 to 40, and more preferably in the range of 17 to 25. Of _N 50 indicating the number of relatively large convex _portion, the ratio of _{N total (N 50 / N total} ) is less likely antiglare fluorescent lamp is obtained is less than 0.4, it exceeds 0.8 Face It is difficult to obtain anti-glare properties. N ₅₀ / N _total is preferably in the range of 0.42 to 0.75, and more preferably in the range of 0.45 to 0.7. The number of the convex part whose length of the line segment of the part which cross | intersects the said average line is 50 micrometers or less among the convex parts which exceed the 2nd reference line located in the height of 0.2 micrometer parallel to the said average line If the number exceeds 10, the number of thin and high irregularities increases, resulting in increased useless scattered light, leading to white blur. Anti-glare hardware in which the number of convex portions having a line segment length of 50 μm or less within a predetermined range exceeds the number of N _total , N ₅₀ / N _total and the second reference line and crosses the average line Since the coated film includes large unevenness and small unevenness in a well-balanced manner, it is possible to achieve both the reflection preventing characteristics of both the fluorescent lamp and the face and to improve white blur.

  The antiglare hard coat film of the present invention is defined by the size, number, and ratio of the convex portions, and further has internal scattering defined by the haze value in the above range, so that It is possible to improve the antiglare property, prevent white blurring, and improve the contrast in a dark room environment.

The antiglare hard coat film of the present invention has a height of 0.5 μm parallel to the roughness average surface of the surface roughness profile at a measurement area of 595 μm × 452 μm at an arbitrary location on the surface of the antiglare hard coat layer. The number M _{total of} protrusions exceeding the reference plane located is in the range of 40 to 150, M _total, and the number M ₁₀₀ of protrusions having a cross-sectional area of 100 μm ² or more in the reference plane among the protrusions. Preferably satisfies the relationship of 0.15 ≦ M ₁₀₀ / M _total ≦ 0.5. When M _total is 40 or more, the anti-glare property of the fluorescent lamp and the face is more easily obtained. Further, when the number is 150 or less, white blur can be further prevented. The M _total is preferably in the range of 40 to 120, more preferably in the range of 45 to 100. When M ₁₀₀ / M _total is in the above range, it is preferable in terms of antiglare property of the fluorescent lamp. M ₁₀₀ / M _total is preferably in the range of 0.17 to 0.45, and more preferably in the range of 0.2 to 0.4.

  The antiglare hard coat film of the present invention is prepared, for example, by preparing an antiglare hard coat layer forming material containing the fine particles, the hard coat layer forming material, and a solvent, and the antiglare hard coat layer forming material is transparent. It can be produced by coating on at least one surface of a plastic film substrate to form a coating film, and curing the coating film to form the antiglare hard coat layer. In the production of the antiglare hard coat film of the present invention, a transfer method using a mold, a method of imparting a concavo-convex shape by an appropriate method such as sandblasting, embossing roll, or the like can also be used.

  The solvent is not particularly limited, and various solvents can be used. One type may be used alone, or two or more types may be used in combination. There are optimum solvent types and solvent ratios for obtaining the antiglare hard coat film of the present invention depending on the hard coat layer forming material composition, the kind of fine particles, the content and the like.

  For example, for the hard coat layer forming material used in the examples described later, when the antiglare hard coat layer is formed by curing the coating film, the solvent ratio is 50% by weight or more as the solvent. By using a certain solvent, an antiglare hard coat film having the characteristics of the present invention can be obtained. The ratio of the alcohol solvent is preferably 53 to 90% by weight. Although the haze value, surface shape, and the like vary depending on the type and ratio of the solvent, it is preferable to use a solvent having the above alcohol solvent ratio because a suitable antiglare hard coat layer can be obtained.

  Various leveling agents can be added to the antiglare hard coat layer forming material. Examples of the leveling agent include a fluorine-based or silicone-based leveling agent, and a silicone-based leveling agent is preferable. As the silicone leveling agent, reactive silicone is particularly preferable. By adding the reactive silicone, slipperiness is imparted to the surface, and scratch resistance is maintained over a long period of time. In addition, when a reactive silicone having a hydroxyl group is used, an antireflection layer (low refractive index layer) containing a siloxane component is formed on the antiglare hard coat layer as described later. The adhesion between the antireflection layer and the antiglare hard coat layer is improved.

  The blending amount of the leveling agent is, for example, 5 parts by weight or less, preferably 0.01 to 5 parts by weight with respect to 100 parts by weight of the entire resin component.

  The anti-glare hard coat layer forming material may include pigments, fillers, dispersants, plasticizers, ultraviolet absorbers, surfactants, antifouling agents, and antioxidants as long as the performance is not impaired. Further, a thixotropic agent or the like may be added. These additives may be used alone or in combination of two or more.

  As the antiglare hard coat layer forming material, for example, a conventionally known photopolymerization initiator as described in JP-A-2008-88309 can be used.

  Examples of the method for coating the antiglare hard coat layer forming material on the transparent plastic film substrate include, for example, a phanten coating method, a die coating method, a spin coating method, a spray coating method, a gravure coating method, a roll coating method, A coating method such as a bar coating method can be used.

  The antiglare hard coat layer forming material is applied to form a coating film on the transparent plastic film substrate, and the coating film is cured. Prior to the curing, the coating film is preferably dried. The drying may be, for example, natural drying, air drying by blowing air, heat drying, or a combination of these.

The means for curing the coating film of the antiglare hard coat layer forming material is not particularly limited, but ultraviolet curing is preferable. The irradiation amount of the energy ray source is preferably 50 to 500 mJ / cm ² as an integrated exposure amount at an ultraviolet wavelength of 365 nm. When the irradiation amount is 50 mJ / cm ² or more, the curing becomes more sufficient, and the hardness of the formed antiglare hard coat layer becomes more sufficient. Moreover, if it is 500 mJ / cm < ² > or less, coloring of the anti-glare hard-coat layer formed can be prevented.

  As described above, the antiglare hard coat film of the present invention can be produced by forming the antiglare hard coat layer on at least one surface of the transparent plastic film substrate. In addition, you may manufacture the anti-glare hard coat film of this invention with manufacturing methods other than the above-mentioned method. The hardness of the antiglare hard coat film of the present invention is affected by the thickness of the layer in pencil hardness, but has a hardness of 2H or more, for example.

  As an example of the antiglare hard coat film of the present invention, one having an antiglare hard coat layer formed on one surface of a transparent plastic film substrate can be mentioned. The antiglare hard coat layer contains fine particles, whereby the surface of the antiglare hard coat layer has an uneven shape. In this example, the antiglare hard coat layer is formed on one side of the transparent plastic film substrate. However, the present invention is not limited to this, and the antiglare hard coat is formed on both sides of the transparent plastic film substrate. It may be an antiglare hard coat film in which a layer is formed. In addition, the antiglare hard coat layer of this example is a single layer, but the present invention is not limited thereto, and the antiglare hard coat layer has a multilayer structure in which two or more layers are laminated. May be.

  In the antiglare hard coat film of the present invention, an antireflection layer (low refractive index layer) may be disposed on the antiglare hard coat layer. For example, when an anti-glare hard coat film is attached to an image display device, light reflection at the interface between air and the anti-glare hard coat layer is one of the factors that lower the image visibility. The antireflection layer reduces the surface reflection. The antiglare hard coat layer and the antireflection layer may be formed on both surfaces of the transparent plastic film substrate. Further, the antiglare hard coat layer and the antireflection layer may each have a multilayer structure in which two or more layers are laminated.

  In the present invention, the antireflection layer is an optical thin film in which thickness and refractive index are strictly controlled, or a laminate of two or more optical thin films. The antireflection layer exhibits an antireflection function by canceling out the reversed phases of incident light and reflected light using the interference effect of light. The wavelength region of visible light that exhibits the antireflection function is, for example, 380 to 780 nm, and the wavelength region with particularly high visibility is in the range of 450 to 650 nm, and the reflectance at 550 nm, which is the central wavelength, is minimized. Thus, it is preferable to design the antireflection layer.

  In designing the antireflection layer based on the light interference effect, as a means for improving the interference effect, for example, there is a method of increasing the refractive index difference between the antireflection layer and the antiglare hard coat layer. In general, in a multilayer antireflection layer having a structure in which two to five optical thin layers (thin films whose thickness and refractive index are strictly controlled) are laminated, a plurality of components having different refractive indexes are formed in a predetermined thickness. Thus, the degree of freedom in optical design of the antireflection layer is increased, the antireflection effect can be further improved, and the spectral reflection characteristics can be made uniform (flat) in the visible light region. Since the optical thin film requires high thickness accuracy, each layer is generally formed by a dry method such as vacuum evaporation, sputtering, or CVD.

  Further, in order to prevent the adhesion of contaminants and improve the ease of removing the adhered contaminants, a contamination prevention layer formed of a fluorine group-containing silane compound or a fluorine group-containing organic compound is provided on the antireflection layer. It is preferable to laminate them.

  In the antiglare hard coat film of the present invention, it is preferable to perform a surface treatment on at least one of the transparent plastic film substrate and the antiglare hard coat layer. If the surface of the transparent plastic film substrate is surface-treated, the adhesion to the antiglare hard coat layer, the polarizer or the polarizing plate is further improved. Further, if the surface of the antiglare hard coat layer is surface-treated, the adhesion with the antireflection layer, the polarizer or the polarizing plate is further improved.

  In the antiglare hard coat film in which the antiglare hard coat layer is formed on one surface of the transparent plastic film substrate, the other surface may be subjected to a solvent treatment in order to prevent curling. Good. Further, in the antiglare hard coat film in which the antiglare hard coat layer is formed on one surface of the transparent plastic film base material, a transparent resin layer is formed on the other surface in order to prevent curling. May be.

  In the antiglare hard coat film of the present invention, the transparent plastic film substrate side can usually be bonded to an optical member used in an LCD via an adhesive or an adhesive. In addition, in this bonding, various surface treatments as described above may be performed on the surface of the transparent plastic film substrate.

  Examples of the optical member include a polarizer and a polarizing plate. Generally, the polarizing plate has a transparent protective film on one side or both sides of the polarizer. When providing a transparent protective film on both surfaces of a polarizer, the same material may be sufficient as the transparent protective film of front and back, and a different material may be sufficient as it. The polarizing plates are usually disposed on both sides of the liquid crystal cell. Further, the polarizing plates are arranged so that the absorption axes of the two polarizing plates are substantially orthogonal to each other.

  Next, an optical member in which the antiglare hard coat film of the present invention is laminated will be described by taking a polarizing plate as an example. A polarizing plate having the function of the present invention can be obtained by laminating the antiglare hard coat film of the present invention with a polarizer or a polarizing plate using an adhesive or a pressure-sensitive adhesive.

  The polarizer is not particularly limited, and various types can be used. Examples of the polarizer include hydrophilic polymer films such as polyvinyl alcohol film, partially formalized polyvinyl alcohol film, and ethylene / vinyl acetate copolymer partially saponified film, and iodine and dichroic dyes. Examples thereof include a polyene-based oriented film such as a film obtained by adsorbing a chromatic substance and uniaxially stretched, a dehydrated polyvinyl alcohol product or a dehydrochlorinated polyvinyl chloride product.

  As the transparent protective film provided on one side or both sides of the polarizer, those having excellent transparency, mechanical strength, thermal stability, moisture shielding property, retardation value stability and the like are preferable. Examples of the material for forming the transparent protective film include the same materials as those for the transparent plastic film substrate.

  Examples of the transparent protective film include polymer films described in JP-A No. 2001-343529 (WO01 / 37007). The polymer film can be produced by extruding the resin composition into a film. The polymer film has a small phase difference and a small photoelastic coefficient, and therefore, when applied to a protective film such as a polarizing plate, it can eliminate problems such as unevenness due to distortion and has a low moisture permeability. Excellent in humidification durability.

  The transparent protective film is preferably a film made of a cellulose resin such as triacetyl cellulose or a film made of a norbornene resin from the viewpoints of polarization characteristics and durability. Examples of the commercial product of the transparent protective film include trade name “Fujitac” (manufactured by FUJIFILM Corporation), trade name “ZEONOR” (manufactured by ZEON Corporation), trade name “ARTON” (manufactured by JSR Corporation), and the like. . The thickness of the transparent protective film is not particularly limited, but is, for example, in the range of 1 to 500 μm from the viewpoints of workability such as strength, handleability, and thin layer properties.

  The configuration of the polarizing plate in which the antiglare hard coat film is laminated is not particularly limited. For example, the transparent protective film, the polarizer and the transparent protective film are arranged in this order on the antiglare hard coat film. The structure which laminated | stacked by this, and the structure which laminated | stacked the said polarizer and the said transparent protective film in this order on the said glare-proof hard coat film may be sufficient.

  The image display device of the present invention has the same configuration as the conventional image display device except that the antiglare hard coat film of the present invention is used. For example, in the case of an LCD, it can be manufactured by appropriately assembling each component such as a liquid crystal cell, an optical member such as a polarizing plate, and an illumination system (backlight or the like) as necessary and incorporating a drive circuit.

  The liquid crystal display device of the present invention is used for any appropriate application. Applications include, for example, OA devices such as personal computer monitors, laptop computers, and copy machines, mobile phones, watches, digital cameras, personal digital assistants (PDAs), portable devices such as portable game machines, video cameras, televisions, microwave ovens, etc. Household electrical equipment, back monitor, car navigation system monitor, car audio and other in-vehicle equipment, display equipment for commercial store information monitors, security equipment such as monitoring monitors, nursing care monitors, medical monitors, etc. Nursing care / medical equipment.

  Next, examples of the present invention will be described together with comparative examples. However, the present invention is not limited by the following examples and comparative examples. The various properties in the following examples and comparative examples were evaluated or measured by the following methods.

(All haze values)
The measurement method of all haze values is based on the haze (cloudiness) of JIS K 7136 (2000 version) and is measured using a haze meter (trade name “HM-150” manufactured by Murakami Color Research Laboratory Co., Ltd.). did.

(Arithmetic mean surface roughness Ra)
A glass plate (thickness 1.3 mm) made by MATSUNAMI is bonded to the surface of the antiglare hard coat film on which the antiglare hard coat layer is not formed, and a high precision fine shape measuring instrument (trade name; The surface shape of the antiglare hard coat layer was measured under the condition of a cut-off value of 0.8 mm using Surfcorder ET4000 (manufactured by Kosaka Laboratory Ltd.), and the arithmetic average surface roughness Ra was determined. The high precision fine shape measuring instrument automatically calculates the arithmetic average surface roughness Ra. The arithmetic average surface roughness Ra is based on JIS B 0601 (1994 edition).

(Number of convex parts exceeding the surface roughness reference line)
In the roughness profile (F profile) obtained by the measurement of the surface shape, a line parallel to the roughness average line of the profile and located at a height of 0.1 μm is a first reference line, and the roughness of the profile A line parallel to the average line and located at a height of 0.2 μm was taken as the second reference line. A measurement value N _total is obtained by measuring the number of convex portions exceeding the first reference line on a straight line having an arbitrary measurement area of 4 mm, and the average among the convex portions exceeding the first reference line what length of the line segment of the reference line across the convex portion of the line was measured the number of convex portions is 50μm or more was measured N _50. Further, among the convex portions exceeding the second reference line, a measurement value is obtained by measuring the number of convex portions having a length of a line segment of 50 μm or less in a portion of the average line crossing the convex portion. did. The number of convex portions is measured not by the number of peaks but by the number of portions crossing the reference line.

(Number of protrusions exceeding the reference surface and their area)
A glass plate (thickness 1.3 mm) manufactured by MATSUNAMI is bonded to the surface of the antiglare hard coat film on which the antiglare hard coat layer is not formed, and a non-contact type three-dimensional surface shape measuring instrument ( The surface shape of the antiglare hard coat layer was measured using a trade name: Wyko, manufactured by Nippon Biko Co., Ltd., with an objective lens 10 times and a measurement area of 595 μm × 452 μm. The measured data is displayed in black and white gray scale with the lower limit of the Z axis set to 400 nm and the upper limit set to 500 nm. By this process, only the convex part exceeding 500 nm can be displayed in white. This image is saved in the JPEG format, and the saved file is opened with image analysis software (trade name: A image-kun, manufactured by Asahi Kasei Engineering Corp.). With the software analysis command “particle analysis”, the gray scale is binarized (threshold 210, small figure removal 5), and the number M _total and the cross-sectional area of each convex part exceeding 500 nm are measured. The number of convex portions having a cross-sectional area of 100 μm ² or more is defined as M ₁₀₀ .

(Evaluation of anti-glare face)
(1) A black acrylic plate (Mitsubishi Rayon Co., Ltd., thickness: 2.0 mm) is bonded to the surface of the antiglare hard coat film on which the antiglare hard coat layer is not formed, and the back surface is reflected. A sample was prepared without the.
(2) In an office environment (about 1000 Lx) generally using a display, the antiglare property of the sample prepared above was visually determined according to the following criteria.
Judgment criteria AA: There is no reflection of the face, and there is no influence on the visibility.
A: Although there is a reflection of the face, there is no practical problem.
B: There is a reflection of the face, which is a little worrisome.
C: The face is clearly reflected and I am quite worried.

(Anti-glare evaluation of fluorescent lamps)
(1) A black acrylic plate (Mitsubishi Rayon Co., Ltd., thickness: 2.0 mm) is bonded to the surface of the antiglare hard coat film on which the antiglare hard coat layer is not formed, and the back surface is reflected. A sample was prepared without the.
(2) In an office environment (about 1000 Lx) generally using a display, the above-prepared sample was placed directly under a fluorescent lamp, and the antiglare property was visually determined according to the following criteria.
Judgment criteria AA: There is no reflection of a fluorescent lamp, and there is no influence on visibility.
A: A fluorescent lamp is reflected, but the outline looks blurry.
B: The outline of the fluorescent lamp can be seen and I am a little worried.
C: The outline of the fluorescent light is clearly reflected, which is quite anxious.

(White blur evaluation)
(1) A black acrylic plate (manufactured by Nitto Resin Co., Ltd., thickness 1.0 mm) is bonded to the surface of the antiglare hard coat film on which the antiglare hard coat layer is not formed, A sample with no reflection was produced.
(2) Generally, in an office environment using a display (about 1000 Lx), the white blur phenomenon is visually observed when viewed from a direction of 60 ° with the vertical direction as a reference (0 °) with respect to the plane of the sample prepared above. And evaluated according to the following criteria.
Criteria AA: Almost no white blur.
A: There is white blur but the effect on visibility is small.
B: White blurring is strong and the visibility is remarkably lowered.

(Refractive index of transparent plastic film substrate and hard coat layer)
The refractive index of the transparent plastic film substrate and the hard coat layer was selected from the Abgo refractometer (trade name: DR-M2 / 1550) manufactured by Atago Co., and monobromonaphthalene was selected as an intermediate solution. Measurement was performed by a specified measurement method shown in the apparatus so that measurement light was incident on the measurement surface of the hard coat layer.

(Refractive index of fine particles)
Fine particles were placed on a slide glass, a refractive index standard solution was dropped onto the fine particles, and a cover glass was placed over to prepare a sample. The sample was observed with a microscope, and the refractive index of the refractive index standard solution in which the contour of the fine particles was most difficult to be seen at the interface with the refractive index standard solution was defined as the refractive index of the fine particles.

(Weight average particle diameter of fine particles)
The weight average particle diameter of the fine particles was measured by a Coulter counting method. Specifically, using a particle size distribution measuring device (trade name: Coulter Multisizer, manufactured by Beckman Coulter, Inc.) using the pore electrical resistance method, electrolysis corresponding to the volume of the particulates when the particulates pass through the pores. By measuring the electrical resistance of the liquid, the number and volume of fine particles were measured, and the weight average particle diameter was calculated.

(Thickness of the antiglare hard coat layer)
Anti-glare hard coat layer by measuring the total thickness of the anti-glare hard coat film using a micro gauge thickness gauge manufactured by Mitutoyo Co., Ltd. and subtracting the thickness of the transparent plastic film substrate from the total thickness. The thickness of was calculated.

Example 1
As a hard coat layer forming material, an ultraviolet curable resin (made by DIC Corporation, trade name “Unidic 17-806”) made of isocyanuric acid triacrylate, pentaerythritol triacrylate, dipentaerythritol hexaacrylate and isophorone diisocyanate polyurethane, solid Min: 80% by weight, solvent: butyl acetate). The refractive index of the cured film of the hard coat layer forming material was 1.53. Crosslinked particles of acrylic and styrene (trade name “Techpolymer XX-133AA” manufactured by Sekisui Plastics Co., Ltd., weight average particle size: 3) per 100 parts by weight of resin solid content of the hard coat layer forming material. 1.0 μm, refractive index: 1.525) 5 parts by weight, leveling agent (manufactured by DIC Corporation, trade name “GRANDIC PC-4100”) 1.0 part by weight, photopolymerization initiator (Ciba Specialty Chemicals) 5 parts by weight of a product name “Irgacure 907” manufactured by the company was mixed. This mixture is diluted with a mixed solvent of isopropyl alcohol (IPA) / cyclopentanone (CPN) (weight ratio 70/30) so that the solid content concentration is 35% by weight, and an antiglare hard coat layer forming material Was prepared.

A triacetyl cellulose film (manufactured by Fuji Film Co., Ltd., trade name “TD80UL”, thickness: 80 μm, refractive index: 1.48) was prepared as a transparent plastic film substrate. The antiglare hard coat layer forming material was applied to one side of the transparent plastic film substrate using a comma coater to form a coating film. Subsequently, the said coating film was dried by heating at 100 degreeC for 1 minute. Thereafter, ultraviolet light having an integrated light quantity of 300 mJ / cm ² was irradiated with a high-pressure mercury lamp, and the coating film was cured to form an anti-glare hard coat layer having a thickness of 6.0 μm. A coated film was obtained.

(Example 2)
An antiglare hard coat film of Example 2 was obtained in the same manner as in Example 1 except that the mixture was diluted with IPA.

(Example 3)
The antiglare hard coat film of Example 3 was obtained in the same manner as in Example 1 except that the mixture was diluted with IPA to form a 5.0 μm thick antiglare hard coat layer.

Example 4
10 parts by weight of the fine particles and 0.5 part by weight of the leveling agent are mixed per 100 parts by weight of the resin solid content of the hard coat layer forming material, and the mixture is mixed so that the solid content concentration is 50% by weight. The antiglare property of Example 4 was the same as that of Example 1, except that it was diluted with an IPA / toluene mixed solvent (weight ratio 75/25) to form an antiglare hard coat layer having a thickness of 5.0 μm. A hard coat film was obtained.

(Comparative Example 1)
An antiglare hard coat film of Comparative Example 1 was obtained in the same manner as in Example 2 except that an antiglare hard coat layer having a thickness of 4.5 μm was formed.

(Comparative Example 2)
In the same manner as in Example 2 except that 10 parts by weight of the fine particles were mixed per 100 parts by weight of resin solid content of the hard coat layer forming material to form an antiglare hard coat layer having a thickness of 6.4 μm. The antiglare hard coat film of Comparative Example 2 was obtained.

(Comparative Example 3)
0.5 parts by weight of the leveling agent is mixed per 100 parts by weight of resin solid content of the hard coat layer forming material, and the mixture is mixed with an IPA / CPN mixed solvent (weight) so that the solid content concentration is 45% by weight. The antiglare hard coat film of Comparative Example 3 was obtained in the same manner as in Example 1 except that the antiglare hard coat layer having a thickness of 8.0 μm was formed.

(Comparative Example 4)
Except for mixing 0.5 parts by weight of the leveling agent per 100 parts by weight of resin solid content of the hard coat layer forming material, and diluting the mixture with CPN so that the solid content concentration becomes 50% by weight, In the same manner as in Example 1, the antiglare hard coat film of Comparative Example 4 was obtained.

(Comparative Example 5)
An antiglare hard coat film of Comparative Example 5 was obtained in the same manner as in Example 4 except that an antiglare hard coat layer having a thickness of 6.0 μm was formed.

(Comparative Example 6)
12 parts by weight of the fine particles and 0.5 part by weight of the leveling agent are mixed per 100 parts by weight of the resin solid content of the hard coat layer forming material, so that the solid content concentration is 45% by weight. The antiglare hard coat film of Comparative Example 6 was obtained in the same manner as in Example 2 except that the antiglare hard coat layer having a thickness of 5.5 μm was formed.

(Comparative Example 7)
As the hard coat layer forming material, component (A): dipentaerythritol and isophorone diisocyanate polyurethane, component (B): silica fine particles (weight average particle size of 100 nm or less) whose surface is modified with organic molecules, component (A) Total: (B) component = 2: 3 hard coat layer forming material (manufactured by JSR Corporation, trade name “OPSTAR Z7540”, solid content: 56% by weight, solvent: butyl acetate / methyl ethyl ketone (MEK ) = 76/24). The refractive index of the cured film of the hard coat layer forming material was 1.485. Crosslinked particles of acrylic and styrene (trade name “Techpolymer XX80AA” manufactured by Sekisui Plastics Co., Ltd., weight average particle diameter: 5.5 μm) as fine particles per 100 parts by weight of resin solid content of the hard coat layer forming material. , Refractive index: 1.515) 5 parts by weight, leveling agent (manufactured by Dainippon Ink & Chemicals, Inc., trade name “GRANDIC PC-4100”) 0.1 part by weight, photopolymerization initiator (Ciba Specialty) -0.5 weight part of chemicals company make, brand name "Irgacure 127") was mixed. This mixture was diluted so that the solid concentration was 45% by weight and the butyl acetate / MEK ratio was 2/1 to prepare an antiglare hard coat layer forming material.

  The antiglare hard coat film of Comparative Example 7 was obtained in the same manner as in Example 1 except that the antiglare hard coat layer forming material was used and a 9 μm thick antiglare hard coat layer was formed. .

(Comparative Example 8)
1.0 part by weight of the leveling agent and 5 parts by weight of the photopolymerization initiator per 100 parts by weight of the resin solid content of the ultraviolet curable resin (manufactured by DIC Corporation, trade name “Unidic 17-806”) The coating solution obtained by mixing and diluting the mixture with IPA so that the solid content concentration is 2% by weight on the antiglare hard coat layer of the antiglare hard coat film obtained in Example 1, A coating film was formed by applying using a comma coater. Subsequently, the said coating film was dried by heating at 100 degreeC for 1 minute. Thereafter, ultraviolet light having an integrated light quantity of 300 mJ / cm ² was irradiated with a high-pressure mercury lamp, and the coating film was cured to form a layer having a thickness of 0.1 μm. Thus, an antiglare hard coat film of Comparative Example 8 was obtained. .

  Various characteristics were measured or evaluated for the antiglare hard coat films of Examples 1 to 4 and Comparative Examples 1 to 8 thus obtained. The results are shown in FIGS. 1 to 12 and Table 1 below.

  As shown in Table 1, in the examples, good results were obtained for all of the antiglare property of the fluorescent lamp, the antiglare property of the face, and the white blur. On the other hand, in the comparative examples, good results were obtained for some of the anti-glare properties of fluorescent lamps, anti-glare properties of faces, and white blur, but not all of the characteristics. .

That is, in Comparative Examples 1 and 2, although the anti-glare property of the fluorescent lamp and the face can be ensured, among the convex portions exceeding the second reference line located at a height of 0.2 μm parallel to the average line Since there are 10 or more convex portions having a length of a line segment that crosses the average line of 50 μm or less, excessive scattering occurs, and a good result cannot be obtained in white blur evaluation. I understand that. In Comparative Examples 3 to 5, since N _total was less than 15, it was found that good results were not obtained in the anti-glare property of the fluorescent lamp and the face. In Comparative Examples 6 and 7, since N ₅₀ / N _total is less than 0.4, the antiglare property of the face is good, but it is understood that good results were not obtained in the antiglare property of the fluorescent lamp. . In Comparative Example 8, since N ₅₀ / N _total exceeds 0.8, the antiglare property of the fluorescent lamp is good, but it can be seen that good results were not obtained in the antiglare property of the face. By measuring the number, size, and haze value of the convex portions defined in the present invention, the tendency of visibility such as anti-glare property of fluorescent lamp, anti-glare property of face and white blurring without visual evaluation is achieved. It is also possible to grasp.

  FIGS. 1-12 is the profile of the cross-sectional surface shape of the glare-proof hard coat film obtained by the said Example and comparative example. The antiglare hard coat film obtained in the above example contains large unevenness and small unevenness in a good balance as compared with the antiglare hard coat film obtained in the comparative example. The anti-glare hard coat film having a surface irregularity shape as in the above examples is in the range defined by the size, number and ratio of the convex portions, and by satisfying a predetermined haze value, It can be seen that it can be used favorably as an antiglare hard coat film.

  According to the antiglare hard coat film of the present invention, both the antiglare property of a fluorescent lamp and the antiglare property of a face can be achieved and white blurring can be prevented. Further, by reducing the haze, it is possible to improve the darkness of black when the image display apparatus displays black in a dark room environment. Therefore, the antiglare hard coat film of the present invention can be suitably used, for example, for optical members such as polarizing plates, image display devices such as liquid crystal panels and LCDs, and its application is not limited and can be applied to a wide range of fields. is there. Further, by measuring the number of convex portions defined in the present invention, it is possible to grasp the tendency of visibility such as antiglare property and white blur without visual evaluation, and an antiglare film. It is also effective as an evaluation index.

Claims (8)

An antiglare hard coat film having an antiglare hard coat layer containing fine particles on at least one surface of a transparent plastic film substrate, wherein the total haze value of the antiglare hard coat film is 0 to 5%. In the range of
The convex portion exceeding the first reference line located at a height of 0.1 μm parallel to the roughness average line of the surface roughness profile at a length of 4 mm at an arbitrary location on the surface of the antiglare hard coat layer. The number N _total is 15 or more,
And when the number of convex portions that exceed the first reference line and the length of the line segment that crosses the convex portion of the average line is 50 μm or more is N ₅₀ , N _total and N ₅₀ satisfy the relationship of the following formula (1),
And the convex part which the length of the line segment of the part which cross | intersects the said average line is 50 micrometers or less among the convex parts exceeding the 2nd reference line located in the height of 0.2 micrometer parallel to the said average line Is 10 or less,
An antiglare hard coat layer forming material containing the fine particles having a weight average particle diameter in the range of 2 to 6 μm, the hard coat layer forming material and a solvent is prepared, and the antiglare hard coat layer forming material is used as the transparent plastic. The antiglare hard coat having a thickness in the range of 5 μm or more and less than 7.5 μm by coating on at least one surface of the film substrate to form a coating film, and further drying and then curing the coating film An antiglare hard coat film produced by forming a layer and having the surface shape of the antiglare hard coat layer formed by drying and curing of the coating film.
0.4 ≦ N ₅₀ / N _total ≦ 0.8 (1) The number M of protrusions exceeding the reference surface located at a height of 0.5 μm parallel to the roughness average surface of the surface roughness profile in a measurement area 595 μm × 452 μm at an arbitrary location on the surface of the antiglare hard coat layer _total is in the range of 40-150,
The antiglare hard coat film according to claim 1, wherein M _total and the number M ₁₀₀ of protrusions having a cross-sectional area of 100 μm ² or more among the protrusions satisfy the relationship of the following formula (2).
0.15 ≦ M ₁₀₀ / M _total ≦ 0.5 (2) The antiglare hard coat layer is formed using the fine particles and a hard coat layer forming material, and a difference in refractive index between the hard coat layer forming material and the fine particles is 0.001 to 0.02. As the fine particles, the fine particles contain at least one kind of spherical or irregular fine particles having a weight average particle diameter of 2 to 6 μm, and the fine particles are 2 with respect to 100 parts by weight of the hard coat layer forming material. The antiglare hard coat film according to claim 1 or 2, which is contained in the range of -15 parts by weight. The antiglare hard coat film according to any one of claims 1 to 3, wherein a thickness of the antiglare hard coat layer is in a range of 1.6 to 3 times a weight average particle diameter of the fine particles. A polarizing plate comprising the antiglare hard coat film according to any one of claims 1 to 4 and a polarizer. An image display device comprising the antiglare hard coat film according to any one of claims 1 to 4. An image display device comprising the polarizing plate according to claim 5. A production method for producing the antiglare hard coat film according to any one of claims 1 to 4,
Preparing the fine particles, the hard coat layer forming material, and the antiglare hard coat layer forming material containing a solvent;
Coating the antiglare hard coat layer forming material on at least one surface of the transparent plastic film substrate to form a coating film;
Curing the coating film to form the antiglare hard coat layer,
A method for producing an antiglare hard coat film, wherein a solvent having an alcohol-based solvent ratio of 50% by weight or more is used as the solvent.

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