JP2010204479A - Glare-proof hard coat film and polarizing plate using the same, and image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glare-proof hard coat film having excellent glare-proofing and sticking-prevention properties and coping with haze highly minutely and precisely irrespective of its low haze value; and to provide a polarizing plate or the like. <P>SOLUTION: The glare-proof hard coat film has a glare-proof hard coat layer formed by using fine particles and a hard coat layer-forming material on a face on at least one side of a transparent plastic film base material. The haze value of this glare-proof hard coat film is in a scope of 20-40%, the number p1 of projecting parts exceeding a first reference line being parallel with an average roughness line of a surface roughness profile and positioned at a height of 0.1 μm is in a scope of 10-70 in a section having a length of 4 mm in an optional section on a surface of the glare-proof hard coat layer, the number p2 of projecting parts exceeding a second reference line being parallel with the average roughness line of the surface roughness profile and positioned at a height of 0.05 μm is in a scope of 40-100, and the relation of the p1 and p2 satisfies the relation: p2-p1≥30. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  Antiglare hard coat films are used in various image display devices such as liquid crystal display devices (LCD), plasma display panels (PDP), electroluminescence displays (ELD), and cathode ray tube display devices (CRT). In order to prevent a decrease in contrast due to reflection of external light or reflection of an image, the light is disposed on the surface of the apparatus. The antiglare hard coat film is produced by, for example, a method of forming a concavo-convex shape on the film surface by providing a resin layer to which inorganic or organic particles are added.

  In recent years, high-definition image display devices with small pixel sizes are increasing in order to improve image quality. Such high definition is remarkably advanced particularly in mobile applications such as mobile phones. A hard coat treatment is performed on the surface of the image display device. However, in a mobile phone or the like, an acrylic cover or the like is usually provided on the outermost surface of the image display device to prevent the screen from being scratched. A certain clearance is provided between the surface of the image display device and the acrylic cover, but the clearance tends to decrease as the device becomes thinner. Therefore, there arises a problem that a sticking phenomenon is likely to occur between the surface of the image display device and the acrylic cover. This sticking phenomenon is a phenomenon in which the overlapped surfaces adhere to each other, and is likely to occur when surfaces with flat surfaces are brought close to each other. Therefore, it is expected to prevent the sticking phenomenon by providing an antiglare hard coat film having surface irregularities on the surface of the image display device. However, when a conventional anti-glare hard coat film is placed on the surface of a high-definition image display device with a small pixel size, the luminance variation existing in the pixel is more emphasized and a visible failure (glare failure) is caused. The image quality was significantly deteriorated. Conventionally, in order to produce a high-definition anti-glare hard coat film, there has been a method for eliminating glare failure by increasing the haze value of the anti-glare layer. Since light is strongly scattered, there is a problem that the contrast is greatly lowered. Also, there is a so-called white blur problem that the screen appears to be blurred if the reflected light is scattered too much.

  The improvement in anti-glare property, the improvement in contrast, and the improvement in white blur are generally considered to be in a reciprocal relationship, but various proposals have been made to achieve both of these characteristics. For example, studies have been made to make a three-dimensional three-dimensional structure agglomerate formed from the particles in the antiglare layer (see, for example, Patent Document 1). A fine pattern may appear on the coated film. Although effective means for improving some characteristics have been proposed (see, for example, Patent Documents 2 and 3), an effective means for solving all the above three problems and preventing sticking has been found. Was not.

JP 2005-316413 A JP 2003-4903 A Japanese Patent No. 4001320

  Accordingly, the present invention provides an anti-glare hard coat film that improves visibility without deteriorating the characteristics of an image display device such as an LCD, which is becoming increasingly high definition and high contrast, and also has anti-sticking properties. The purpose is to do. That is, an object is to provide an anti-glare hard coat film having excellent anti-glare properties and anti-sticking properties and capable of corresponding to high definition even with a low haze value, a polarizing plate and an image display device using the same And

In order to achieve the above object, the antiglare hard coat film of the present invention is formed on at least one surface of a transparent plastic film substrate using fine particles and a hard coat layer forming material. An anti-glare hard coat film having a layer, wherein the anti-glare hard coat film has a haze value in the range of 20 to 40%, and the length of an arbitrary portion of the anti-glare hard coat layer surface is 4 mm. The number p1 of the convex portions exceeding the first reference line located at a height of 0.1 μm parallel to the roughness average line of the surface roughness profile is in the range of 10 to 70, and the surface The number p2 of convex portions exceeding the second reference line located at a height of 0.05 μm parallel to the roughness average line of the roughness profile is in the range of 40 to 100, and the p1 and the p2 Relationship with It is characterized by satisfying the relationship of the following formula (1).
p2-p1 ≧ 30 (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 including an antiglare hard coat film or a polarizing plate, wherein the hard coat film is the antiglare hard coat film of the present invention, and the polarizing plate is the book. It is a polarizing plate of the invention.

  According to the antiglare hard coat film of the present invention, glare failure can be suppressed and a low haze value can be achieved even in an ultra-high definition liquid crystal panel having a resolution of 200 ppi or more. Therefore, compared with the conventional high-definition anti-glare hard coat film, the contrast of light and darkness can be greatly improved, and the anti-sticking property can also be obtained. 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 having a measurement length of 4 mm of the cross-sectional surface shape of the antiglare hard coat film of Example 5. (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. 6 is a profile having a measurement length of 4 mm of the cross-sectional surface shape of the antiglare hard coat film of Example 6. (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. 7 is a profile having a measurement length of 4 mm of the cross-sectional surface shape of the antiglare hard coat film of Example 7. (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. 8 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 1. FIG. 9 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 2. FIG. 10 is a profile showing a cross-sectional surface shape of the antiglare hard coat film of Comparative Example 3 in a range of 3 to 4 mm out of a measured length of 4 mm. 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 4. FIG. 12 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 5. FIG. 13 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 6. FIG. 14 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. 15 is a profile showing a cross-sectional surface shape of the antiglare hard coat film of Comparative Example 8 in a range of 3 to 4 mm out of a measured length of 4 mm. FIG. 16 is a schematic diagram for explaining a method for measuring the number of convex portions exceeding the reference line of the surface roughness in the present invention.

In the antiglare hard coat film of the present invention, the difference between the refractive index n1 of the fine particles and the refractive index n2 of the hard coat layer forming material preferably satisfies the relationship of the following formula (2).
−0.1 ≦ n1-n2 ≦ −0.02 (2)

  In the antiglare hard coat film of the present invention, the fine particles are preferably silicone fine particles.

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 containing the following components (A) and (B). It is preferable.
(A) component: a curable compound having at least one of an acrylate group and a methacrylate group (B) component: particles formed by bonding inorganic oxide particles and an organic compound containing a polymerizable unsaturated group

  In the antiglare hard coat film of the present invention, the weight average particle size of the component (B) is preferably 200 nm or less.

  In the component (B), the inorganic oxide particles preferably include at least one particle selected from the group consisting of silicon oxide, titanium oxide, aluminum oxide, zinc oxide, tin oxide and zirconium oxide.

  In the hard coat layer forming material, the component (B) is preferably contained in the range of 100 to 200 parts by weight with respect to 100 parts by weight of the component (A).

  The fine particles include one or more spherical or irregular fine particles having a weight average particle diameter in the range of 1 to 8 μm, and the fine particles are 1 to 20 parts by weight with respect to 100 parts by weight of the hard coat layer forming material. It is preferable that it is included in the range.

  In the antiglare hard coat film of the present invention, the thickness of the antiglare hard coat layer is preferably in the range of 1 to 5 times the weight average particle diameter of the fine particles.

  In the antiglare hard coat film of the present invention, an antireflection layer is preferably formed on the antiglare hard coat layer.

  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, an anti-glare hard-coat film will serve as the function as a cover plate with which the liquid crystal cell surface is mounted | worn.

  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. As described above, 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. Examples of the hard coat layer forming material include the following components (A) and (B): The thing containing is preferable.

(A) component: a curable compound having at least one of an acrylate group and a methacrylate group (B) component: particles formed by bonding inorganic oxide particles and an organic compound containing a polymerizable unsaturated group

  As said (A) component, the curable compound which has at least one group of the acrylate group and methacrylate group which harden | cure with a heat | fever, light (ultraviolet rays etc.) or an electron beam etc. can be used, for example. Examples of the component (A) include acrylates of polyfunctional compounds such as silicone resins, polyester resins, polyether resins, epoxy resins, urethane resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, and polyhydric alcohols. And oligomers or prepolymers such as styrene and methacrylate. These may be used alone or in combination of two or more.

  As said (A) component, the reactive diluent which has at least one group of an acrylate group and a methacrylate group can also be used, for example. 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 component (A) include butanediol glycerin ether diacrylate, isocyanuric acid acrylate, isocyanuric acid methacrylate, and the like. As the component (A), one type may be used alone, or two or more types may be used in combination.

  The component (B) is as described above. In the component (B), examples of the inorganic oxide particles include fine particles such as silicon oxide (silica), titanium oxide, aluminum oxide, zinc oxide, tin oxide, and zirconium oxide. Among these, fine particles of silicon oxide (silica), titanium oxide, aluminum oxide, zinc oxide, tin oxide, and zirconium oxide are preferable. These may be used alone or in combination of two or more.

  In the antiglare hard coat film of the present invention, the component (B) has a weight average particle diameter of 1 nm to 200 nm from the viewpoints of preventing light scattering, preventing the hard coat layer from lowering transmittance, preventing coloring, and transparency. It is preferable that it is what is called a nanoparticle which is the range of. The said weight average particle diameter can be measured by the method as described in the below-mentioned Example, for example. The weight average particle diameter is more preferably in the range of 1 nm to 100 nm. The inventors have found that when the component (B), which is a nanoparticle, is added to the component (A), the movement of the fine particles in the coating and drying process changes due to, for example, selection of a solvent described later. It was. That is, in a system to which nanoparticles were added, there was a tendency that surface irregularities due to the fine particles were hardly formed when a specific solvent was used, and that the irregularities were easily formed when another specific solvent was used. If the nanoparticles were not contained, the difference in surface irregularities depending on the type of solvent was not large. From these phenomena, when the nanoparticles are contained, repulsive force acts on the nanoparticles and the fine particles, so that the fine particles are easily dispersed relatively uniformly, and the movement of the fine particles in the coating and drying process is controlled. Therefore, it can be presumed that the number of added parts of the fine particles can be reduced, and the surface uneven shape of the present invention can be effectively produced. However, the present invention is not limited or limited by this inference.

  In the component (B), the inorganic oxide particles are bonded (surface modified) with an organic compound containing a polymerizable unsaturated group. The polymerizable unsaturated group is reactively cured with the component (A), thereby improving the hardness of the hard coat layer. As the polymerizable unsaturated group, for example, acryloyl group, methacryloyl group, vinyl group, propenyl group, butadienyl group, styryl group, ethynyl group, cinnamoyl group, maleate group, and acrylamide group are preferable. The organic compound containing a polymerizable unsaturated group is preferably a compound having a silanol group in the molecule or a compound that generates a silanol group by hydrolysis. It is also preferable that the organic compound containing a polymerizable unsaturated group has a photosensitive group.

  The blending amount of the component (B) is preferably in the range of 100 to 200 parts by weight with respect to 100 parts by weight of the component (A). By making the blending amount of the component (B) 100 parts by weight or more, curling and folding of the antiglare hard coat film can be more effectively prevented, and by making it 200 parts by weight or less, scratch resistance is obtained. Property and pencil hardness can be made high. The blending amount of the component (B) is more preferably in the range of 100 to 150 parts by weight with respect to 100 parts by weight of the component (A).

  By adjusting the blending amount of the component (B), for example, the refractive index of the antiglare hard coat layer can be adjusted. When the antireflection layer described later is not provided, the refractive index of the antiglare hard coat layer is preferably lowered in order to suppress the reflectance. In the case of providing an antireflection layer (low refractive index layer), it is possible to uniformly reduce reflection in the wavelength region of visible light by increasing the refractive index of the antiglare hard coat layer.

  The fine particles for forming the antiglare hard coat layer provide an antiglare property and an anti-sticking property by making the surface of the formed antiglare hard coat layer uneven, and the antiglare hard coat layer. The main function is to control the haze value. 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. Is given. The organic fine particles are not particularly limited. For example, polymethyl methacrylate resin fine particles (PMMA fine particles), silicone resin fine particles, polystyrene resin fine particles, polycarbonate resin fine particles, acrylic styrene resin fine particles, benzoguanamine resin fine particles, melamine resin fine particles, polyolefin resin. Fine particles, polyester resin fine particles, polyamide resin fine particles, polyimide resin fine particles, polyfluorinated ethylene resin fine particles and the like can be mentioned. These inorganic fine particles and organic fine particles may be used alone or in combination of two or more. Among these, in order to improve glare failure, the refractive index of the fine particles contained in the antiglare hard coat layer is preferably lower than the refractive index of the hard coat layer forming material. From this point, the fine particles Are preferably silicone fine particles.

The difference between the refractive index n1 of the fine particles and the refractive index n2 of the hard coat layer forming material preferably satisfies the relationship of the following formula (2).
−0.1 ≦ n1-n2 ≦ −0.02 (2)
When the antiglare hard coat film is produced so as to have the same haze value, the reason is not clear, but the refractive index difference represented by the above formula is a negative value (when the refractive index of the fine particles is higher) Since the anti-glare property can be obtained better than when the refractive index difference is a positive value (when the refractive index of the fine particles is lower), the refractive index difference is preferably a negative value. When the refractive index difference is more than −0.02, the fine particles must be added in a large amount in order to obtain sufficient scattering characteristics. Also. If it is less than −0.1, scattering tends to be too strong to obtain good contrast.

  The weight average particle diameter of the fine particles is preferably in the range of 1 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 1.5 to 7 μm, and still more preferably in the range of 2 to 6 μm. The weight average particle diameter of the fine particles is preferably in the range of 20 to 100% 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 1 to 20 parts by weight, more preferably in the range of 2 to 15 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 to 5 times the weight average particle diameter of the fine particles, more preferably in the range of 1.2 to 4 times. Further, the thickness of the antiglare hard coat layer is preferably in the range of 5 to 12 μm from the viewpoint of coating properties and pencil hardness, and the weight average particle diameter of the fine particles is adjusted to be within this thickness range. It is preferable to do. When the thickness is within the predetermined range, it is easy to realize the surface shape of the antiglare hard coat film of the present invention in which a large number of fine irregularities exist independently, and the antiglare hard coat layer has sufficient hardness. (For example, 3H or more in pencil hardness). Further, when the thickness is larger than the predetermined range, there is a problem that the curl is large and the line running property at the time of coating is lowered, and further, there is a problem that the antiglare property is lowered. Further, when the thickness is smaller than the predetermined range, there is a problem that glare failure cannot be prevented and the sharpness is lowered.

  The antiglare hard coat film of the present invention has a haze value in the range of 20 to 40%. The haze value is a haze value (cloudiness) according to JIS K 7136 (2000 version). The haze value is preferably in the range of 20 to 35%, more preferably in the range of 20 to 30%. When the haze value is 20% or more, glare failure can be prevented even in a high-definition image display device, and when it is 40% or less, contrast can be improved. If the haze value is too low, glare failure is likely to occur. In order to set the haze value in the above range, the fine particles and the hard coat layer forming material are selected so that the absolute value of the refractive index difference between the fine particles and the hard coat layer forming material is 0.02 or more. It is preferable to do. In particular, when the difference (n1-n2) between the refractive index n1 of the fine particles and the refractive index n2 of the hard coat layer forming material is in the range of -0.1 to -0.02, the haze with a lower glare failure is obtained. Even a value is preferable because it hardly occurs.

The antiglare hard coat film of the present invention has a roughness average line of a surface roughness profile at a length of 4 mm at an arbitrary position on the surface of the antiglare hard coat layer in the uneven shape on the surface of the antiglare hard coat layer. Convex portions exceeding the first reference line located at a height of 0.1 μm in parallel are formed in the range of 10 to 70, and 0.05 μm parallel to the roughness average line of the surface roughness profile The convex part exceeding the 2nd reference line located in the height of is formed in the range of 40-100 pieces. The relationship between the number p1 of convex portions exceeding the first reference line and the number p2 of convex portions exceeding the second reference line satisfies the relationship of the following formula (1).
p2-p1 ≧ 30 (1)
When the number of convex portions exceeding the first reference line is 70 or less, excessive scattering hardly occurs, so that a good contrast can be obtained. When the number of convex portions exceeding the second reference line is 40 or more, an antiglare hard coat film having a good antisticking property can be obtained. When the number is less than 40, the surface becomes too flat, and sufficient anti-sticking property cannot be obtained. Moreover, it can be set as the glare-proof hard coat film which can prevent a glare failure also in a high-definition image display apparatus by satisfy | filling the relationship of said Formula (1), and having a haze value of 20% or more. And the contrast of a display image is securable because haze value is 40% or less. The number p1 of convex portions exceeding the first reference line is preferably in the range of 15 to 60, and more preferably in the range of 30 to 60. The number p2 of the convex portions exceeding the second reference line is preferably in the range of 60 to 100, more preferably in the range of 65 to 100.

  The antiglare hard coat film of the present invention has unevenness in the controlled range as described above, and has internal scattering defined by the haze value in the above range, thereby improving antiglare property and glare failure. Both elimination can be achieved.

  The arithmetic average surface roughness Ra of the antiglare hard coat film surface is preferably in the range of 0.01 to 0.1 μm. Here, the arithmetic average surface roughness Ra is defined in JIS B 0601 (1994 edition). When the Ra is an antiglare hard coat film having a thickness of 0.1 μm or less, when used in an image display device or the like, scattering of reflected light when viewed from an oblique direction is suppressed, and white blur is further improved. In addition, the contrast in daylight can be further improved. In order to prevent the reflection of external light and images on the surface of the antiglare hard coat film, a certain degree of surface roughness is required, but the reflection can be improved when Ra is 0.01 μm or more. .

  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 5 parts by weight of fine particles are added, the solid content concentration is 45% by weight, and the thickness of the antiglare hard coat layer is about 10 μm, The ratio of methyl isobutyl ketone (MIBK) / methyl ethyl ketone (MEK) is at least 1.5 / 1 to 2.0 / 1 (weight ratio), and an antiglare hard coat film having the characteristics of the present invention is obtained. In the case of butyl acetate / MEK, an antiglare hard coat film having the characteristics of the present invention is obtained in the range of at least 1.5 / 1 to 3.0 / 1 (weight ratio). When the component (B) is a nanoparticle as in the hard coat layer forming material used in the examples described later, for example, depending on the type and mixing ratio of the solvent, the nanoparticle and the fine particle are dispersed. It is presumed that the unevenness tendency of the antiglare hard coat layer surface changes due to the change. However, the present invention is not limited or limited by this inference. For example, in the case of the hard coat layer forming material described later, when the solvent is MEK, cyclopentanone, ethyl acetate, acetone or the like, irregularities are easily formed on the surface, and the solvent is MIBK, toluene, butyl acetate, 2 In the case of -propanol, ethanol, etc., it is difficult to form irregularities on the surface. Therefore, in order to obtain an antiglare hard coat film having the characteristics of the present invention, it is also preferable to control the surface shape according to the type of solvent and the ratio of the solvent.

  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 also 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.

(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 are placed on a slide glass, a refractive index standard solution is dropped onto the fine particles, and a cover glass is 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 hardly visible 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.

(Haze value)
The haze value was measured using a haze meter HM-150 (manufactured by Murakami Color Research Laboratory Co., Ltd.) in accordance with the haze (cloudiness) of JIS K 7136 (2000 version).

(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 using Surfcoder ET4000 (manufactured by Kosaka Laboratory Co., Ltd.) to determine the arithmetic average surface roughness Ra. 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 obtained by measuring the surface shape, a line parallel to the roughness average line of the profile and located at a height of 0.1 μm is parallel to the first reference line and the roughness average line of the profile. A line located at a height of 0.05 μm was taken as a second reference line. A measurement value was obtained by measuring the number of convex portions exceeding the respective reference lines on a straight line having an arbitrary measurement region of 4 mm. FIG. 16 is a schematic diagram illustrating a method for measuring the number of the convex portions. The convex part to be measured is hatched. The number of convex portions is measured not by the number of peaks but by the number of portions crossing the reference line. For example, when there are a plurality of peaks in the portion exceeding the reference line, such as 3 and 9 in the profile, the number of convex portions is counted as one. In FIG. 16, the number of convex portions exceeding the first reference line is a total of nine peaks 1 to 9 in the profile.

(Sticking prevention evaluation)
A glass plate (thickness 1.3 mm) was bonded to the surface of the antiglare hard coat film on which the antiglare hard coat layer was not formed, to prepare a sample. A front plate (acrylic cover) taken out from a mobile phone (SH905i, manufactured by Sharp Corporation) was strongly pressed against the surface of the antiglare hard coat layer of the sample, and the presence or absence of a sticking phenomenon was confirmed.
Criteria G: Sticking does not occur.
NG: Sticking occurs.

(Anti-glare evaluation)
(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 general, the antiglare property of the sample prepared above was visually determined in an office environment (about 1000 Lx) using a display.
Judgment criteria AA: Although there is an image reflection, the influence on the visibility is small.
A: Although there is an image reflection, there is no practical problem.
B: There is an image reflection, and there is a problem in practical use.
C: The image is clearly reflected.

(Glare evaluation)
The surface on which the antiglare hard coat layer of the antiglare hard coat film was not formed was bonded to a glass plate having a thickness of 1.3 mm to obtain a measurement sample. This sample was set on a mask pattern placed on a backlight (made by Hakuba Photo Industry Co., Ltd., trade name “Light Viewer 5700”). As the mask pattern, a lattice pattern (212 ppi) having an opening of 20 μm × 58 μm, a vertical line width of 20 μm, and a horizontal line width of 62 μm was used. The distance from the mask pattern to the antiglare hard coat layer was 1.3 mm, and the distance from the backlight to the mask pattern was 1.5 mm. And the glare of the said glare-proof hard coat film was determined visually by the following criteria.
Judgment criteria AAA: Level at which almost no glare is recognized.
AA: Although there is glare, the level of influence on visibility is small.
A: Although there is glare, there is no problem in practical use.
B: Slight glare and practically problematic level.

(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.

Example 1
A hard coat layer forming material (JSR Co., Ltd.) containing the component (A) in which nano-silica particles (component (B)) formed by bonding inorganic oxide particles and an organic compound containing a polymerizable unsaturated group are dispersed. Product name “OPSTAR Z7540”, solid content: 56 wt%, solvent: butyl acetate / methyl ethyl ketone (MEK) = 76/24 (weight ratio)). The hard coat layer forming material is composed of (A) component: dipentaerythritol and isophorone diisocyanate polyurethane, (B) component: silica fine particles whose surface is modified with organic molecules (weight average particle size of 100 nm or less), (A) component Total: (B) component = 2: 3. The refractive index of the cured film of the hard coat layer forming material was 1.485. Silicone fine particles (made by Momentive Performance Materials, trade name “Tospearl 145”, weight average particle size: 4.5 μm, refractive index: 1 per 100 parts by weight of resin solid content of the hard coat layer forming material) .425) 5 parts by weight, leveling agent (Dainippon Ink Chemical Co., Ltd., trade name “GRANDIC PC-4100”) 0.1 part by weight, photopolymerization initiator (Ciba Specialty Chemicals, 0.5 part by weight of a trade name “Irgacure 127”) was mixed. This mixture was diluted so that the solid content concentration was 45% by weight and the butyl acetate / MEK ratio was 2/1 (weight ratio) to prepare an antiglare hard coat layer forming material.

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 with an integrated light quantity of 300 mJ / cm ² was irradiated with a high-pressure mercury lamp, the coating film was cured to form an antiglare hard coat layer having a thickness of 7 μm, and the antiglare hard coat film of Example 1 was formed. Got.

(Example 2)
In Example 1, the amount of silicone fine particles mixed was 3 parts by weight per 100 parts by weight of resin solid content of the hard coat layer forming material, in the same manner as in Example 1, and the antiglare of Example 2 A hard coat film was obtained.

(Example 3)
In Example 1, the amount of the silicone fine particles mixed was 6 parts by weight per 100 parts by weight of the resin solid content of the hard coat layer forming material, and the antiglare hard coat layer was prepared in the same manner as in Example 1. An antiglare hard coat film of Example 3 having a thickness of 6 μm was obtained.

Example 4
As the fine particles, “Tospearl 120” (made by Momentive Performance Materials, weight average particle size: 2.0 μm, refractive index: 1.425), which is a silicone fine particle, was used. By the method, the antiglare hard coat film of Example 4 was obtained.

(Example 5)
As the fine particles, “Tospearl 130” (made by Momentive Performance Materials Co., Ltd., weight average particle size: 3.0 μm, refractive index: 1.425), which is a silicone fine particle, was used. The antiglare property of Example 5 in which the thickness of the antiglare hard coat layer is 10 μm in the same manner as in Example 1 except that the resin solid content of 100 parts by weight of the hard coat layer forming material is 7 parts by weight. A hard coat film was obtained.

前記式（１）において、Ｒ^１は、−Ｈ若しくは−ＣＨ_３であり、Ｒ^２は、−ＣＨ_２ＣＨ_２ＯＸ若しくは下記一般式（２）で表される基であり、前記Ｘは、−Ｈ若しくは下記一般式（３）で表されるアクリロイル基である。

前記一般式（２）において、前記Ｘは、−Ｈ若しくは下記一般式（３）で表されるアクリロイル基であり、前記Ｘは、同一であってもよいし、異なっていてもよい。

(Example 6)
As the hard coat layer forming material, a resin (Dainippon Ink & Chemicals, trade name “GRANDIC PC1071”, solid content: 66% by weight) containing the following components was prepared. The refractive index of the cured film of the hard coat layer forming material was 1.52. Acrylic particles (trade name “SSX-106” manufactured by Sekisui Plastics Co., Ltd., weight average particle size: 6.0 μm, refractive index: 1.49 per 100 parts by weight of resin solid content of the hard coat layer forming material. 15 parts by weight and 0.5 parts by weight of a leveling agent (Dainippon Ink Chemical Co., Ltd., trade name “GRANDIC PC-4100”) was mixed. Most of the aspect ratio of the acrylic particles was 1.05. This mixture is diluted with a mixed solvent (butyl acetate: ethyl acetate = 58: 42 (weight ratio)) so that the solid content concentration is 35% by weight to prepare an antiglare hard coat layer forming material. did. The leveling agent is a copolymer obtained by copolymerization at a molar ratio of dimethylsiloxane: hydroxypropylsiloxane: 6-isocyanatohexyl isocyanuric acid: aliphatic polyester = 6.3: 1.0: 2.2: 1.0. It is a thing.
Urethane acrylate (100 parts by weight) consisting of pentaerythritol acrylate and hydrogenated xylene diisocyanate
Dipentaerythritol hexaacrylate (49 parts by weight)
Pentaerythritol tetraacrylate (41 parts by weight)
Pentaerythritol triacrylate (24 parts by weight)
Mixture of polymer and copolymer having a repeating unit represented by the following general formula (1) (59 parts by weight)
Photopolymerization initiator: Trade name “Irgacure 184” (manufactured by Ciba Specialty Chemicals) (5 parts by weight)
Mixed solvent: butyl acetate: ethyl acetate = 89: 11 (weight ratio)

In the formula (1), R ¹ is —H or —CH ₃ , R ² is —CH ₂ CH ₂ OX or a group represented by the following general formula (2), and the X is — H or an acryloyl group represented by the following general formula (3).

In the general formula (2), X is —H or an acryloyl group represented by the following general formula (3), and the Xs may be the same or different.

The antiglare hard coat layer forming material was applied to one side of the transparent plastic film substrate using a bar coater to form a coating film. Subsequently, the said coating film was dried by heating at 100 degreeC for 1 minute. Thereafter, the metal halide lamp was irradiated with ultraviolet rays having an integrated light amount of 300 mJ / cm ² , the coating film was cured to form an antiglare hard coat layer having a thickness of 11 μm, and the antiglare hard coat film of Example 6 was formed. Obtained.

(Example 7)
Except for using “Techpolymer XX98AA” (manufactured by Sekisui Plastics Co., Ltd., weight average particle size: 3.5 μm, refractive index: 1.555), which is a crosslinked particle of acrylic and styrene, as the fine particles, In the same manner as in Example 1, the antiglare hard coat film of Example 7 was obtained.

(Comparative Example 1)
Implementation was performed except that “Techpolymer XX80AA” (manufactured by Sekisui Plastics Co., Ltd., weight average particle size: 5.5 μm, refractive index: 1.515), which is a crosslinked particle of acrylic and styrene, was used as the fine particles. In the same manner as in Example 1, an antiglare hard coat film of Comparative Example 1 in which the thickness of the antiglare hard coat layer was 9 μm was obtained.

(Comparative Example 2)
The antiglare hard coat layer was prepared in the same manner as in Example 1 except that the mixture was diluted so that the solid content concentration was 45% by weight and the butyl acetate / MEK ratio was 3/1 (weight ratio). The antiglare hard coat film of Comparative Example 2 having a thickness of 9 μm was obtained.

(Comparative Example 3)
Except for using “Techpolymer XX79AA” (manufactured by Sekisui Plastics Co., Ltd., weight average particle size: 5.0 μm, refractive index: 1.505), which is a crosslinked particle of acrylic and styrene, as the fine particles, In the same manner as in Example 1, an antiglare hard coat film of Comparative Example 3 in which the thickness of the antiglare hard coat layer was 9 μm was obtained.

(Comparative Example 4)
Except for using “Techpolymer XX81AA” (manufactured by Sekisui Plastics Co., Ltd., weight average particle size: 5.0 μm, refractive index: 1.535), which is a crosslinked particle of acrylic and styrene, as the fine particles, In the same manner as in Example 1, an antiglare hard coat film of Comparative Example 4 in which the thickness of the antiglare hard coat layer was 9 μm was obtained.

(Comparative Example 5)
In Comparative Example 1, the mixing amount of acrylic and styrene crosslinked particles was set to 15 parts by weight per 100 parts by weight of resin solid content of the hard coat layer forming material. No. 5 antiglare hard coat film was obtained.

(Comparative Example 6)
As a hard coat layer forming material, an ultraviolet curable resin composed of isocyanuric acid triacrylate, pentaerythritol triacrylate, dipentaerythritol hexaacrylate and isophorone diisocyanate polyurethane was prepared. The refractive index of the cured film of the hard coat layer forming material was 1.53. Leveling agent (trade name “Defenser MCF323”, manufactured by Dainippon Ink & Chemicals, Inc.) 0.5 parts by weight per 100 parts by weight of resin solid content of the hard coat layer forming material, crosslinked acrylic and styrene particles (“Tech Polymer XX94AA ", manufactured by Sekisui Plastics Co., Ltd., weight average particle size: 6.0 μm, refractive index: 1.495) and a photopolymerization initiator (Ciba Specialty Chemicals, trade name" Irgacure ") 184 ") 5 parts by weight is dissolved or dispersed in a mixed solvent (toluene: butyl acetate: ethyl acetate = 86.5: 1.0: 12.5 (weight ratio)) so that the solid content concentration is 45% by weight. Thus, an antiglare hard coat layer forming material was prepared.

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, the metal halide lamp was irradiated with ultraviolet rays having an integrated light quantity of 300 mJ / cm ² , the coating film was cured to form an antiglare hard coat layer having a thickness of 10 μm, and the antiglare hard coat film of Comparative Example 6 was formed. Obtained.

(Comparative Example 7)
As a hard coat layer forming material, an ultraviolet curable resin composed of isocyanuric acid triacrylate, pentaerythritol triacrylate, dipentaerythritol hexaacrylate and isophorone diisocyanate polyurethane was prepared. The refractive index of the cured film of the hard coat layer forming material was 1.53. Leveling agent (trade name “Megafac F-470N”, manufactured by Dainippon Ink & Chemicals, Inc.) 0.5 parts by weight per 100 parts by weight of resin solid content of the hard coat layer forming material, amorphous silica particles (Fuji Product name “Silo Hovic 702”, manufactured by Silysia Chemical Co., Ltd., 8 parts by weight of weight average particle size: 2.5 μm, refractive index: 1.46, and photopolymerization initiator (product of Ciba Specialty Chemicals Co., Ltd.) Name “Irgacure 184”) is dissolved or dispersed in a mixed solvent (toluene: butyl acetate = 85: 15 (weight ratio)) so that the solid content concentration is 38% by weight, and an antiglare hard coat A layer forming material was prepared.

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, the metal halide lamp was irradiated with ultraviolet rays having an integrated light amount of 300 mJ / cm ² , the coating film was cured to form an antiglare hard coat layer having a thickness of 5 μm, and the antiglare hard coat film of Comparative Example 7 Obtained.

(Comparative Example 8)
As a hard coat layer forming material, an ultraviolet curable resin composed of isocyanuric acid triacrylate, pentaerythritol triacrylate, dipentaerythritol hexaacrylate and isophorone diisocyanate polyurethane was prepared. The refractive index of the cured film of the hard coat layer forming material was 1.53. Leveling agent (manufactured by Dainippon Ink and Chemicals, trade name “Defenser MCF323”) 0.5 parts by weight, polystyrene particles (manufactured by Soken Chemical Co., Ltd.) per 100 parts by weight of resin solid content of the hard coat layer forming material , Trade name “Chemisnow SX350H”, weight average particle size: 3.5 μm, refractive index: 1.59) 14 parts by weight and photopolymerization initiator (trade name “Irgacure 184” manufactured by Ciba Specialty Chemicals) 5 weight Part is dissolved or dispersed in a mixed solvent (toluene: butyl acetate: ethyl acetate = 86.5: 1.0: 12.5 (weight ratio)) so that the solid content concentration is 45% by weight, and antiglare A hard coat layer forming material was prepared.

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, the metal halide lamp was irradiated with ultraviolet rays having an integrated light quantity of 300 mJ / cm ² , the coating film was cured to form an antiglare hard coat layer having a thickness of 5 μm, and the antiglare hard coat film of Comparative Example 8 was formed. Obtained.

(Reference Example 1)
A hard coat film of Reference Example 1 was obtained in the same manner as in Example 1 except that fine particles (silicone fine particles, trade name “Tospearl 145”) were not added.

  Various properties were measured or evaluated for the antiglare hard coat films of Examples 1 to 7 and Comparative Examples 1 to 8 thus obtained and the film of Reference Example 1. The results are shown in FIGS. 1 to 15 and Table 1 below.

  As shown in Table 1, in the examples, good results were obtained for all of anti-sticking property, anti-glare property, glare and white blur. In particular, the glare was an extremely good result equivalent to a state where there was no antiglare layer (Reference Example 1), “AAA: almost no glare”. On the other hand, in the comparative examples, although good results have been obtained for some of the antiglare properties, glare and white blurring, all of the characteristics are good and those having the same characteristics as the examples are obtained. There wasn't. Furthermore, by measuring the number of haze values and convex portions defined in the present invention, it is also possible to grasp the tendency of visibility such as anti-glare property, glare and white blur without visual evaluation. I understand.

  1 to 15 are profiles of cross-sectional surface shapes of the antiglare hard coat films obtained in the examples and comparative examples. In the anti-glare hard coat film obtained in the above example, it exceeds the 0.05 μm height reference line compared to the anti-glare hard coat film obtained in the comparative example, but a 0.1 μm reference line. There are many fine irregularities that do not exceed. The anti-glare hard coat film having a concavo-convex shape as in the above examples is in a range in which the size and number of the convex portions are defined, and further, by satisfying a predetermined haze value, It can be seen that it can be used favorably as a conductive hard coat film.

  According to the anti-glare hard coat film of the present invention, it is possible to solve all of the conflicting issues of high contrast, ensuring anti-glare properties, preventing white blur, and supporting high definition. In addition, the anti-sticking property is also good. 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. Among them, it is suitable for mobile applications in which a cover such as acrylic is often provided on the device surface. Furthermore, by measuring the number of haze values and convex portions defined in the present invention, anti-glare properties, glare, white blurring, etc. are visually recognized without performing visual evaluation after being incorporated into the panel. It is also possible to grasp the tendency of the property, and it is also effective as an index for evaluating the antiglare film.

Claims (12)

An antiglare hard coat film having an antiglare hard coat layer formed using fine particles and a hard coat layer forming material on at least one surface of a transparent plastic film substrate,
The haze value of the antiglare hard coat film is in the range of 20 to 40%,
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 p1 is in the range of 10 to 70,
And the number p2 of convex portions exceeding the second reference line located at a height of 0.05 μm parallel to the roughness average line of the surface roughness profile is in the range of 40-100.
Furthermore, the relationship between said p1 and said p2 satisfy | fills the relationship of following formula (1), The anti-glare hard coat film characterized by the above-mentioned.
p2-p1 ≧ 30 (1) The antiglare hard coat film according to claim 1, wherein a difference between a refractive index n1 of the fine particles and a refractive index n2 of the hard coat layer forming material satisfies a relationship of the following formula (2).
−0.1 ≦ n1-n2 ≦ −0.02 (2) The antiglare hard coat film according to claim 1 or 2, wherein the fine particles are silicone fine particles. The antiglare hard coat layer is formed using the fine particles and a hard coat layer forming material containing the following components (A) and (B). The antiglare hard coat film described in 1.
(A) component: a curable compound having at least one of an acrylate group and a methacrylate group (B) component: particles formed by bonding inorganic oxide particles and an organic compound containing a polymerizable unsaturated group The antiglare hard coat film according to claim 4, wherein the component (B) has a weight average particle diameter of 200 nm or less. 6. The component (B), wherein the inorganic oxide particles include at least one particle selected from the group consisting of silicon oxide, titanium oxide, aluminum oxide, zinc oxide, tin oxide and zirconium oxide. The antiglare hard coat film described. In the said hard-coat layer forming material, the said (B) component is contained in the range of 100-200 weight part with respect to 100 weight part of said (A) component, It is any one of Claim 4-6. The antiglare hard coat film described. The fine particles include one or more spherical or irregular fine particles having a weight average particle diameter in the range of 1 to 8 μm, and the fine particles are 1 to 20 parts by weight with respect to 100 parts by weight of the hard coat layer forming material. The antiglare hard coat film according to any one of claims 1 to 7, which is contained in a range. The antiglare hard coat film according to any one of claims 1 to 8, wherein the thickness of the antiglare hard coat layer is in the range of 1 to 5 times the weight average particle diameter of the fine particles. The antiglare hard coat film according to any one of claims 1 to 9, wherein an antireflection layer is formed on the antiglare hard coat layer. A polarizing plate having a polarizer and an antiglare hard coat film, wherein the antiglare hard coat film is the antiglare hard coat film according to any one of claims 1 to 10. A polarizing plate. An image display device comprising an antiglare hard coat film or a polarizing plate, wherein the hard coat film is the antiglare hard coat film according to any one of claims 1 to 10, and the polarizing plate is claimed. Item 12. An image display device comprising the polarizing plate according to Item 11.

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