JP2014071395A - Anti-glare hard coat film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface protection anti-glare hard coat film that is high in transmittance, is low in a haze value, is excellent in transparency, is high in image sharpness, suppresses glare, reduces whitishness (white blur) of a coated film, suppresses contrast reduction, improves visibility of a display and is excellent in an anti-fouling property and abrasion resistance, without imparting an anti-glare property.SOLUTION: In the anti-glare hard coat film having an anti-glare hard coat layer containing an organic fine particle, resin and a fluorine-containing polymerizable compound provided on a transparent film, when an average value of a height in an evaluation area of a surface of the anti-glare hard coat film is null (zero), a maximum sectional height expressed by a difference between a maximum value of the height in the evaluation area and a minimum value of the height in the evaluation area is 0.2 μm or more and 0.6 μm or less.

Description

  The present invention relates to an antiglare hard coat film suitable for preventing a reduction in visibility used on the surface of various displays represented by liquid crystal displays, plasma displays, and organic EL displays.

In order to prevent reflection of outside scenes on the display surface of notebook PCs, LCD monitors, etc., usually a mixture of organic or inorganic fine particles and a binder resin or curable resin is applied to the substrate to form irregularities on the surface. As a result, antiglare properties are exhibited. In order to improve the antiglare property, it is necessary to increase the uneven shape or increase the frequency of the unevenness. However, if the irregularities are large or the frequency increases, the haze value (degree) of the anti-glare layer increases and anti-glare properties can be obtained, but the screen is blurred due to the reflection of external light, or the haze value increases. As a result, there has been a problem that the image definition is lowered and the visibility of the display image is deteriorated. Furthermore, when the haze value of the surface, which is a general evaluation of conventional anti-glare hard coat films, is lowered, the degree of white blurring due to the reflection of external light can be suppressed, but so-called scintillation (glare, As a technique to eliminate this, a method of increasing the haze value inside the antiglare layer was used, but due to the internal haze caused by the difference in refractive index between the fine particles and the resin The transmittance was lowered, the display brightness of the display device was lowered, and at the same time, the coating film became whitish due to the internal haze, so that the contrast was greatly lowered.

  For example, in Japanese Patent Application Laid-Open No. 11-326608 (Patent Document 1), a translucent material having an average particle diameter of 0.5 to 5 μm and a difference in refractive index from a transmissive resin of 0.02 to 0.2. An antiglare film in which fine particles are blended is disclosed. By setting the difference in refractive index between the translucent resin constituting the antiglare layer and the translucent fine particles contained therein to 0.02 to 0.2, an image can be obtained without reducing diffusion and antiglare properties. In this case, the image definition can be maintained high even if the haze value is increased to reduce glare. However, the haze of the film specifically obtained is as high as 10% or more and has an antiglare property, while the coating film becomes whitish and the transmittance and contrast are remarkably reduced.

  Japanese Patent Application Laid-Open No. 2008-286878 (Patent Document 2) discloses that, in an antiglare film, the difference in refractive index between a cured binder and a light-transmitting fine particle is as small as 0 to 0.05. Therefore, the light transmittance in the antiglare hard coat layer can be improved, and the arithmetic average roughness (Ra) measured in accordance with JIS B 0601-1994 on the surface of the antiglare hard coat layer. Is suppressed to a small range of 0.01 to 0.30 μm and the average interval of unevenness (Sm) of 10 to 300 μm, while diffusing light on the surface (outer surface) of the antiglare hard coat layer, Light transmittance can be maintained, and the anti-glare film is said to be able to exhibit a good balance between suppression of glare and improvement of transmission clarity. However, the arithmetic average roughness (Ra) is 0.01 to 0.30 μm and the average interval of unevenness (Sm) is not so small as 10 to 300 μm, and most of the antiglare films currently on the market are Applicable to the range. In addition, the film obtained specifically has an arithmetic average roughness (Ra) of 0.1 μm or more, an image sharpness value measured through an optical comb having a width of 2 mm is less than 70%, and 60 ° reflection. When the measured image sharpness value is 60% or less, the antiglare property is not sufficient, but glare prevention on the high-definition panel is insufficient, and the whiteness of the coating film is not taken into consideration. The problem remains that the contrast is significantly reduced.

JP 11-326608 A JP 2008-286878 A

  In the conventional technology, considering the antiglare property, the haze value is increased from the viewpoint of preventing glare, and the image clarity cannot be sufficiently increased, so the low transmittance and the whitishness of the coating are eliminated. If the image is not formed and the image is displayed, the screen becomes whitish, and there is a problem that the image quality is deteriorated particularly in the black display.

  Therefore, the object of the present invention is to provide a high transmittance, a low haze value, excellent transparency, and image clarity, without imparting an antiglare property more than necessary, compared to such a conventional antiglare film. High, suppresses glare in the image, reduces the whitishness of the paint film, suppresses contrast reduction, improves the visibility of the display, and has excellent antifouling and scratch resistance for surface protection. It is to provide an antiglare hard coat film.

The present invention provides the following [1] to [3].
[1] An antiglare hard coat film in which an antiglare hard coat layer containing fine particles, a resin and a fluorine-containing polymerizable compound is provided on a transparent film, wherein the antiglare hard coat film is within the evaluation region on the surface of the antiglare hard coat film The maximum cross-sectional height expressed by the difference between the maximum height in the evaluation area and the minimum height in the evaluation area when the average value of the heights of these is zero (zero) is 0.2 μm or more and 0.6 μm An anti-glare hard coat film characterized by:
[2] The antiglare hard coat film according to [1], wherein the fluorine-containing polymerizable compound has a fluorine fluoroaliphatic group and a hydrophilic group.
[3] The content of the fluorine-containing polymerizable compound is 0.1 to 10.0 parts by weight (solid content) with respect to 100 parts by weight of the resin in the hard coat layer. [2] The antiglare hard coat film according to [2].

  According to the anti-glare hard coat film of the present invention, the whitishness of the coating film is reduced and the contrast is not lowered, and there is no practical problem of anti-glare property and high transmittance, high image definition, It is possible to provide an antiglare hard coat film for surface protection that suppresses glare and improves the visibility of a display and is excellent in antifouling property and scratch resistance.

  Hereinafter, embodiments of the present invention will be described in detail. The antiglare hard coat film of the present invention is an antiglare hard coat film in which an antiglare hard coat layer containing organic fine particles, a resin and a fluorine-containing polymerizable compound is provided on a transparent film. Maximum cross-section height expressed by the difference between the maximum height in the evaluation area and the minimum height in the evaluation area when the average height in the evaluation area on the surface of the coated film is zero. Is 0.2 μm or more and 0.6 μm or less, and according to such an antiglare hard coat film, the reason why the haze value is low, the transmittance is high, and the transparency is excellent is based on the examination of the present inventors. It is guessed as follows.

  The haze value of the antiglare hard coat film is due to the surface haze generated when light is refracted and scattered due to irregularities on the surface of the antiglare hard coat layer, and the presence of organic fine particles in the antiglare hard coat layer. There is an internal haze that occurs when light is refracted and scattered, and the maximum height in the evaluation area when the average height in the evaluation area on the surface of the antiglare hard coat film is zero. When the maximum cross-sectional height represented by the difference between the value and the minimum height in the evaluation area is 0.6 μm or less, the refraction and scattering of light caused by surface irregularities can be suppressed, so that surface haze is hardly exhibited. Therefore, the loss of light due to light refraction and scattering can be suppressed, so that a decrease in transmittance can be suppressed, and the phenomenon that the antiglare hard coat film becomes whitish due to scattered light on the surface of the antiglare hard coat layer can be suppressed. It is believed that excellent sex.

  In addition, when the above-mentioned maximum cross-sectional height of the surface of the antiglare hard coat film exceeds 0.6 μm, refraction and scattering of light due to unevenness of the surface is strengthened, so that surface haze is easily developed, and refraction and scattering of light. There is a concern about the decrease in transmittance due to the loss of light due to light, and it is easy to obtain antiglare properties due to scattered light on the surface of the antiglare hard coat layer, but it is difficult to suppress the phenomenon that the antiglare hard coat film becomes whitish and cloudy. For this reason, transparency and transmission clarity are liable to decrease.

  Moreover, since the unevenness | corrugation of a film surface becomes too small when the maximum cross-sectional height is less than 0.2 micrometer, it becomes difficult to obtain the anti-glare property by the scattered light in the anti-glare hard-coat layer surface.

  Therefore, in the present invention, the maximum cross-sectional height of the surface of the antiglare hard coat film needs to be 0.2 μm or more and 0.6 μm or less, and preferably the maximum cross-sectional height is 0.25 μm or more. 0.55 μm or less, more preferably, the maximum cross-sectional height is 0.3 μm or more and 0.5 μm or less. In the present invention, the “evaluation region” is a measurement region.

  The maximum cross-sectional height of the present invention is 0.2 μm or more and 0.6 μm or less, and the antiglare hard coat film has the number of organic fine particles protruding on the surface of the antiglare hard coat film of 100 / mm 2 or less. The antiglare hard coat film preferably has a low haze value, a high transmittance, and an excellent transparency. According to the study by the present inventors, it is presumed as follows.

  The haze value of the antiglare hard coat film is due to the surface haze generated when light is refracted and scattered due to irregularities on the surface of the antiglare hard coat layer, and the presence of organic fine particles in the antiglare hard coat layer. When the number of the organic fine particles protruding on the surface of the antiglare hard coat film is 100 / mm2 or less, there is an internal haze generated by the light being refracted and scattered. Since scattering can be suppressed, surface haze is less likely to occur, light loss due to light refraction and scattering can be suppressed, so that a decrease in transmittance can be suppressed, and anti-glare hard due to scattered light on the surface of the anti-glare hard coat layer. It is considered that the coated film is excellent in transparency because the phenomenon of whitish turbidity is suppressed.

  In the present invention, the number of the organic fine particles protruding on the surface of the antiglare hard coat film is determined from the surface photograph (image) of the antiglare hard coat film by a scanning electron microscope (magnification 2000 times). The number of the organic fine particles protruding from the resin layer on the surface in the range of 1 mm × 1 mm is 0.75 μm 2 or more.

  The transparent film that can be used in the present invention is not particularly limited. For example, a polyethylene terephthalate film (PET; refractive index 1.665), a polycarbonate film (PC; refractive index 1.582), a triacetyl cellulose film (TAC) ; Refractive index 1.485), norbornene film (NB; refractive index 1.525) can be used, and the film thickness is not particularly limited, but about 25 μm to 250 μm is generally used. Since the refractive index of a general ionizing radiation curable resin is about 1.52, a TAC film or NB film close to the refractive index of the resin is preferable in order to increase the visibility. A PET film is preferred.

  In the present invention, the fluorine-containing polymerizable compound is a polymerizable fluorine-based surfactant or fluorine-based surface modifier having an unsaturated group, and these polymerized fluorine-based surfactants or fluorine-based surface modifiers. As, it preferably has a fluoroaliphatic group and a hydrophilic group, and more preferably has a perfluoroalkylene ether chain from the viewpoint of antifouling properties. Furthermore, it is preferable that the compounding quantity of a fluorine-containing polymeric compound is 0.1-10 weight part (solid content conversion) with respect to 100 weight part of resin.

  The resin used in the present invention can be used without particular limitation as long as it is a resin that forms a film. In particular, it imparts hard properties (pencil hardness, scratch resistance) to the surface of the antiglare hard coat layer, and also provides antiglare hard. An ionizing radiation curable resin is preferred in that a large amount of heat is not required when forming the coat layer. In addition, the antiglare hard coat layer is a leveling agent, antifoaming agent, lubricant, ultraviolet absorber, light stabilizer, polymerization inhibitor, wetting and dispersing agent, rheology control agent, antioxidant as long as the effect of the present invention is not changed. An agent, an antifouling agent (excluding a fluorine-containing polymerizable resin), an antistatic agent, a conductive agent and the like may be contained as necessary.

  In the present invention, the resin (ionizing radiation curable resin) is not particularly limited as long as it is a transparent resin that is cured by irradiation with an electron beam or ultraviolet rays, and examples thereof include urethane acrylate resins and polyester acrylates. It can be appropriately selected from a resin based on epoxy resin and an epoxy acrylate resin. Preferred examples of the ionizing radiation curable resin include those composed of an ultraviolet curable polyfunctional acrylate having two or more (meth) acryloyl groups in the molecule. Specific examples of the UV curable polyfunctional acrylate having two or more (meth) acryloyl groups in the molecule include neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and trimethylol. Polyol polyacrylates such as propane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, bisphenol A diglycidyl Epoxys such as diacrylate of ether, diacrylate of neopentyl glycol diglycidyl ether, di (meth) acrylate of 1,6-hexanediol diglycidyl ether ( A) Polyester (meth) acrylate, polyhydric alcohol, polyisocyanate and hydroxyl group-containing (meta) which can be obtained by esterifying acrylate, polyhydric alcohol and polyhydric carboxylic acid and / or anhydride and acrylic acid ) Urethane (meth) acrylate obtained by reacting acrylate, polysiloxane poly (meth) acrylate, and the like.

  The ultraviolet curable polyfunctional acrylate may be used alone or in combination of two or more, and the content thereof is preferably 50 to 95% by weight with respect to the resin solid content of the antiglare hard coat layer coating material. is there. In addition to the polyfunctional (meth) acrylate, preferably 10% by weight or less of 2-hydroxy (meth) acrylate, 2-hydroxypropyl (meth) based on the resin solid content of the antiglare hard coat layer coating. ) Monofunctional acrylates such as acrylate and glycidyl (meth) acrylate can also be added.

In addition, a polymerizable oligomer used for the purpose of adjusting the hardness can be added to the antiglare hard coat layer. Examples of such oligomers include terminal (meth) acrylate polymethyl (meth) acrylate, terminal styryl poly (meth) acrylate, terminal (meth) acrylate polystyrene, terminal (meth) acrylate polyethylene glycol, terminal (meth) acrylate acrylonitrile-styrene copolymer. Macromonomers such as polymers and terminal (meth) acrylate styrene-methyl methacrylate copolymers can be mentioned, and the content thereof is preferably 5 to 50 weights based on the resin solid content in the antiglare hard coat coating material. %.

  The material for forming the organic fine particles used in the present invention is not particularly limited. For example, vinyl chloride resin (refractive index 1.53), acrylic resin (refractive index 1.49), (meth) acrylic resin (refractive index). 1.52-1.53) polystyrene resin (refractive index 1.59), melamine resin (refractive index 1.57), polyethylene resin, polycarbonate resin, acrylic-styrene copolymer resin (refractive index 1.49-1.59) ) And the like.

  Further, in the present invention, the coating thickness of the antiglare hard coat layer needs to be 1 to 2 times the average particle diameter of the organic fine particles constituting the antiglare hard coat layer, and the preferred average of the organic fine particles The particle size is 2 to 6 μm, more preferably 2.5 to 5.5 μm.

  If the coating thickness is less than 1 times the average particle size of the organic fine particles constituting the anti-glare hard coat layer, the fine particles protrude on the surface of the coating, and an anti-glare property more than necessary is imparted. Light scattering increases, and the surface becomes whitish due to light scattering, which significantly reduces the visibility of the display. On the other hand, when the coating thickness exceeds twice the average particle size of the organic fine particles constituting the antiglare hard coat layer, no antiglare property is obtained and the transmittance is lowered. The average particle diameter of the organic fine particles can be measured by a laser diffraction scattering method. In addition, when the average particle size of the organic fine particles is less than 2 μm, the antiglare property is completely obtained when the coating thickness of the antiglare hard coat layer is set to 1 to 2 times the average particle size of the organic fine particles. Absent. On the other hand, when the average particle size of the organic fine particles is larger than 6 μm, the coating thickness must be increased, and thus the transmittance decreases.

  The organic fine particles used in the present invention are organic fine particles having a refractive index difference of 0.001 to 0.020 with respect to the refractive index of the resin constituting the antiglare hard coat layer (refractive index after curing). In particular, it is more preferable to use organic fine particles having a refractive index difference of 0.001 to 0.010. That is, since the refractive index of a general ionizing radiation curable resin is about 1.52, it is preferable to use organic fine particles having a refractive index of 1.50 to 1.54. For example, when the resin constituting the antiglare hard coat layer is an ionizing radiation curable resin (meth) acrylic resin or urethane acrylate (refractive index = 1.52), the organic fine particles used in the antiglare hard coat layer are (meta ) It is preferable to use fine particles whose refractive index is adjusted to 1.51 to 1.53 with acrylic resin (refractive index of 1.52 to 1.53) or acrylic-styrene copolymer resin.

  When the refractive index difference between the organic fine particles constituting the antiglare hard coat layer and the resin is less than 0.001, the coating thickness of the antiglare hard coat layer is set to 1 to 2 times the average particle diameter of the organic fine particles. In this case, no antiglare property is obtained. Moreover, when the refractive index difference between the organic fine particles constituting the antiglare hard coat layer and the resin exceeds 0.020, the haze value is adjusted to 0.1 to 5.0% in order not to reduce the transmittance. In this case, since the number of added parts relative to 100 parts by weight of the resin is reduced, sufficient antiglare property cannot be obtained, and in addition parts where the antiglare property is obtained, the haze value exceeds 5.0% and the transmittance and contrast are low. descend.

  The organic fine particles are preferably higher by 0.001 to 0.020 than the refractive index of the resin used for the antiglare hard coat layer. There is no great difference in the effect obtained even when using fine particles having a refractive index difference of 0.001 to 0.020 lower than that of the resin, but the resin constituting the antiglare hard coat layer is a highly versatile ionizing radiation curable resin. It is preferable to use a (meth) acrylic resin and urethane acrylate (refractive index = 1.52) in large quantities at a low cost, and considering the availability of fine particles, the refractive index of the resin is 0.001 to 0.00. Fine particles with a height of 020 are preferred. The organic fine particles may be used alone or in combination of two or more. Even when organic fine particles are used in combination, the organic fine particles used in combination have an average particle diameter of 2 to 6 μm and a refractive index difference from the resin constituting the antiglare hard coat layer of 0.001 to 0.020. It is preferable to be in the range. Furthermore, inorganic fine particles or inorganic fine particles or organic fine particles having a refractive index difference of less than 0.001 or greater than 0.020 may be blended within a range not impairing the effects of the present invention.

  In the present invention, the organic fine particles are preferably added in an amount of 3 to 35 parts by weight, more preferably 5 to 25 parts by weight, based on 100 parts by weight of the resin in the antiglare hard coat layer. When the blending amount of the organic fine particles is less than 3 parts by weight with respect to 100 parts by weight of the resin, the coating thickness of the antiglare hard coat layer is set to 1 to 2 times the average particle size of the organic fine particles. No anti-glare property can be obtained. Moreover, when the compounding quantity of organic fine particles exceeds 35 weight part with respect to 100 weight part of said resin, a haze value will become high and the transmittance | permeability and contrast will fall.

  The antiglare hard coat layer can be formed by applying and drying a paint obtained by dissolving and dispersing the resin and fine particles in a solvent on a transparent film. The solvent can be appropriately selected depending on the solubility of the resin, and may be any solvent that can uniformly dissolve or disperse at least solids (resin, fine particles, catalyst, curing agent, and other additives). Examples of such solvents include ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.), ethers (dioxane, tetrahydrofuran, etc.), aliphatic hydrocarbons (hexane, etc.), alicyclic hydrocarbons ( Cyclohexane, etc.), aromatic hydrocarbons (toluene, xylene, etc.), halogenated carbons (dichloromethane, dichloroethane, etc.), esters (methyl acetate, ethyl acetate, butyl acetate, etc.), alcohols (methanol, ethanol, isopropanol, Butanol, cyclohexanol, etc.), cellosolves (methyl cellosolve, ethyl cellosolve, etc.), cellosolve acetates, sulfoxides, amides and the like. Further, the solvents may be used alone or in combination.

  The coating method is not particularly limited, but it can be applied with a method that allows easy adjustment of the coating thickness, such as gravure coating, microgravure coating, bar coating, slide die coating, slot die coating, dip coating, etc. Is possible. The film thickness of the antiglare hard coat layer can be measured by observing a cross-sectional photograph of the antiglare film with a microscope or the like and actually measuring from the coating film interface to the surface.

  In the antiglare film of the present invention, the 60 ° specular gloss is preferably 60% or more and 90% or less, and the 20 ° specular gloss is preferably 15% or more and 50% or less. The (transmission Y value) is preferably 92.00 or more.

  Further, in the antiglare film of the present invention, transmission clearness measured through four optical combs (width 2 mm, 1 mm, 0.5 mm, 0.125 mm) using a transmission clarity measurement device based on JIS K 7105-1981. It is preferable that the total value of the degrees is 280% or more, and the value of the transmission sharpness measured through each optical comb is 70% or more.

  In the antiglare film of the present invention, a functional layer such as an antireflection layer or an antistatic layer can be provided on the transparent film in addition to the antiglare hard coat layer containing organic fine particles and a resin. . However, by providing such a functional layer, surface undulations may be canceled and the desired antiglare property may not be obtained. Therefore, a functional layer is provided on the antiglare hard coat layer containing organic fine particles. When provided, the thickness of the functional layer is preferably 0.5 μm or less. It is also possible to provide a functional layer under the antiglare hard coat layer. Examples of the functional layer include a refractive index control layer for improving the antireflection function, an easy adhesion layer for obtaining adhesion between the base material and the antiglare hard coat layer, and an antistatic layer.

  Further, in the antiglare film of the present invention, in addition to the antiglare hard coat layer containing organic fine particles and a resin, a functional layer such as an antireflection layer or an antistatic layer is contained on the transparent film. When provided on the antiglare hard coat layer, when the coating thickness of the antiglare hard coat layer is set to be equal to or less than the average particle size of the organic fine particles constituting the antiglare hard coat layer, The total coating thickness of the functional layers needs to be 1 to 2 times the average particle size of the organic fine particles constituting the antiglare hard coat layer. The antiglare film of the present invention is an antiglare film when a functional layer such as an antireflection layer or an antistatic layer is provided on the antiglare hard coat layer containing the organic fine particles and the resin on the transparent film. Difference between the maximum height in the evaluation area and the minimum height in the evaluation area when the average height in the evaluation area on the surface of the glare film, that is, the surface of the functional layer is zero. It is necessary that the maximum cross-sectional height represented by is 0.6 μm or less.

  The following examples illustrate the invention, but are not intended to limit the invention. The average particle size of the fine particles was measured with a laser diffraction particle size analyzer SALD2200 (manufactured by Shimadzu Corporation). The thickness of the coating film was measured by observing the cross section with a scanning electron microscope manufactured by Keyence Corporation. Unless otherwise specified, “parts” and “%” described below represent “parts by weight” and “% by weight”, respectively.

[Example 1]
<Preparation of paint>
To 55.0 g of toluene, 1.2 g of acrylic particles (manufactured by Soken Chemical Co., Ltd., average particle size 5.0 μm, refractive index: 1.525) was added and sufficiently stirred. In this solution, 30.0 g of an acrylic ultraviolet curable resin (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., refractive index: 1.52) and Irgacure 184 (photopolymerization initiator, manufactured by Ciba Specialty Chemicals Co., Ltd.) 5 g, 0.3 g of a fluorine-containing polymerizable compound (manufactured by DIC) having a fluorofluoroaliphatic group and a hydrophilic group was added and sufficiently stirred to prepare a coating material.
<Preparation of antiglare film>
The above-mentioned paint was applied to Fuji TAC (triacetyl cellulose film, manufactured by Fuji Film Co., Ltd.) with Meyer bar # 14 (manufactured by RDS), dried at 80 ° C. for 1 minute, and then irradiated with 350 mJ / cm 2 ultraviolet light (light source: It was cured by irradiation with a UV lamp manufactured by Fusion Japan. The thickness of the obtained coating film was 7 μm.

[Example 2]
<Preparation of paint>
The acrylic particles used in Example 1 were changed to acrylic particles having a refractive index of 1.53 (manufactured by Soken Chemical Co., Ltd., average particle size: 4.0 μm), and fluorine-containing fluorine-containing fluoroaliphatic groups and hydrophilic groups. A coating material was prepared in the same manner as in Example 1 except that the addition amount of the polymerizable compound (manufactured by DIC) was changed to 0.9 g.
<Preparation of antiglare film>
An antiglare film was produced in the same manner as in Example 1 except that the Meyer bar used in Example 1 was changed to # 10. The thickness of the obtained coating film was 5 μm.

[Example 3]
<Preparation of paint>
To 38.5 g of toluene, 8.7 g of acrylic-styrene copolymer particles (manufactured by Sekisui Plastics Co., Ltd., average particle size 5.0 μm, refractive index: 1.525) was added and sufficiently stirred. To this solution, 25.5 g of acrylic ultraviolet curable resin (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., refractive index: 1.52) and Irgacure 184 (photopolymerization initiator, manufactured by Ciba Specialty Chemicals Co., Ltd.) 5 g of a fluorine-containing polymerizable compound having a fluorine fluoroaliphatic group and a hydrophilic group (manufactured by DIC) (1.8 g) was added and sufficiently stirred to prepare a coating material.
<Preparation of antiglare film>
An antiglare film was produced in the same manner as in Example 1 except that the Meyer bar used in Example 1 was changed to # 18. The thickness of the obtained coating film was 9 μm.

[Comparative Example 1]
<Preparation of paint>
To 55.0 g of toluene, 1.2 g of acrylic particles (manufactured by Soken Chemical Co., Ltd., average particle size 2.5 μm, refractive index: 1.53) was added and stirred sufficiently. In this solution, 30.0 g of an acrylic ultraviolet curable resin (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., refractive index: 1.52) and Irgacure 184 (photopolymerization initiator, manufactured by Ciba Specialty Chemicals Co., Ltd.) 5 g and 0.5 g of BYK350 (leveling agent, manufactured by Big Chemie Co., Ltd.) were added and stirred sufficiently to prepare a paint.
<Preparation of antiglare film>
An antiglare film was produced in the same manner as in Example 2 except that the Meyer bar used in Example 2 was changed to # 8. The thickness of the obtained coating film was 3.5 μm.

  The antiglare hard coat films of Examples and Comparative Examples produced as described above were evaluated for the following items, and the results are summarized in Table 1 below.

(1) Maximum cross-sectional height It was measured using a three-dimensional surface roughness meter “VertScan2.0” manufactured by Ryoka System Co., Ltd. When the average value (Ave) of the height in the evaluation area of the area roughness parameter obtained by the measurement is zero, the maximum height (P) in the evaluation area and the minimum height (V) in the evaluation area ) To determine the maximum cross-sectional height (St). The measurement conditions are set as follows.
<Optical conditions>
Camera: SONY HR-50 1/3 type Objective: 10 x (10 times)
Tube: 1 x Body
Relay: No Relay
Filter: 530 white
* Light intensity adjustment: Automatically performed so that the Lamp value falls within the range of 50-95.
<Measurement conditions>
Mode: Wave
Size: 640 × 480
Range (μm): Start (5), Stop (−10)

(2) Number of protruding particles (organic fine particles) From the surface photograph (image) of the antiglare hard coat film by a scanning electron microscope (magnification 2000 times) manufactured by Keyence Corporation, the range of 1 mm × 1 mm of the antiglare hard coat film The number of organic fine particles protruding from the resin layer on the surface was calculated to be 0.75 μm 2 or more. Note that with a scanning electron microscope (magnification 2000 times), protruding organic fine particles can be recognized from the surface photograph (image) of the antiglare hard coat film as long as the area is about 0.03 μm 2 or more.

(3) Haze value The haze value was measured using a haze meter “HM150” manufactured by Murakami Color Research Laboratory.

(4) Luminous transmittance (transmission Y value)
Murakami Color Research Laboratory “integrated sphere high-speed spectral transmission measurement system DOT-3” was used, and the measurement was carried out according to JISZ8722.

  Here, the luminous transmittance is obtained from Y = K∫S (λ) y (λ) T (λ) dλ. S (λ): spectral distribution at a wavelength of 400 to 700 nm, y (λ): color matching function, T (λ): spectral solid angle transmittance, Y: luminous transmittance.

(5) Transmission clarity Measurement was carried out using a Suga Test Instruments Co., Ltd. image clarity measuring device “ICM-1DP”. The measurement was performed using an optical comb having widths of 2 mm, 1 mm, 0.5 mm, and 0.125 mm, and the measured values at each width and the sum thereof were calculated.

(6) Glossiness (20 degrees, 60 degrees)
Using a gloss meter (GM-3D) manufactured by Murakami Color Research Laboratory, apply a black vinyl tape (Nitto Vinyl Tape, PROSELF No. 21 (wide)) to the opposite side of the coating and measure the glossiness at 20 or 60 degrees. did.

(7) Glitter Each anti-glare film was layered on a liquid crystal display (LCD) having a resolution of 150 ppi that was displayed in green on the entire surface, and the degree of occurrence of glittering screen was visually evaluated. In addition, a clear type hard coat film which does not generate glare was previously set on the LCD surface. The case where there was no glare and the case where the glare was slight was designated as “◯”, and the case where the glare was large and the visibility deteriorated was designated as “X”. Furthermore, what was evaluated as glare between “◯” and “×” was defined as “Δ”.

(8) White bokeh, whitish White bokeh due to reflection of external light is applied with black vinyl tape (Nitto vinyl tape, PROSELF No. 21 (wide)) on the opposite side of the coating as black density with a Macbeth densitometer. It was measured. 2.15 or more is “◯”, 2.10 or more and less than 2.15 is “Δ”, and less than 2.10 is “x”. In addition, the whitishness of the coating film due to transmitted light is that light diffuses in the film due to internal haze when the white fluorescent lamp is viewed through an anti-glare hard coat film with the coated surface facing the observer. The state in which the coating became whitish was visually evaluated. Those with no whiteness and slight whiteness were indicated with “◯”, those with a slight whiteness were indicated with “△”, and those with a white coating film were indicated with “X”.

(9) Scratch resistance test Using a # 0000 steel wool, it was reciprocated 10 times while applying a load of 1000 gf / cm ² , and the presence or absence of scratches was confirmed.

(10) Antifouling The antifouling property is “◎”, which can be easily wiped off when a line is drawn on the coated surface of the antiglare hard coat film with a magic and the line drawn with the magic is wiped off with a cloth. Was “◯”, those that were difficult to wipe off were “Δ”, and those that could not be wiped were “X”.

Claims (3)

  An anti-glare hard coat film comprising an anti-glare hard coat layer containing organic fine particles, a resin and a fluorine-containing polymerizable compound on a transparent film, wherein the anti-glare hard coat film has a high surface area in the evaluation region. The maximum cross-sectional height expressed by the difference between the maximum height in the evaluation region and the minimum height in the evaluation region when the average value of the height is zero (zero) is 0.2 μm or more and 0.6 μm or less An anti-glare hard coat film characterized by being. The antiglare hard coat film according to claim 1, wherein the fluorine-containing polymerizable compound has a fluorine fluoroaliphatic group and a hydrophilic group. The content of the fluorine-containing polymerizable compound is 0.1 to 10.0 parts by weight (solid content) with respect to 100 parts by weight of the resin in the hard coat layer. The antiglare hard coat film described in 1.