JP2009037046A - Anti-glare film for liquid crystal display and liquid crystal display having the same - Google Patents

Abstract

An antiglare film for a liquid crystal display capable of suppressing glare, increasing black density and image definition, and improving image visibility, and a liquid crystal display including the same.
An anti-glare film for a liquid crystal display comprises an anti-glare hard coat layer containing an active energy ray-curable resin, a photopolymerization initiator, and translucent organic fine particles on a transparent substrate made of a cellulosic material. An antiglare hard coat layer made of a cured product of the forming composition is formed. And the refractive index difference of the hardened | cured material of the binder containing active energy ray hardening-type resin and a photoinitiator and translucent organic fine particles is 0-0.05. The arithmetic average roughness (Ra) on the surface of the antiglare hard coat layer is 0.01 to 0.30 μm, and the average interval (Sm) of the irregularities is 10 to 300 μm. Furthermore, the overall haze value is 10% or less, and the ratio of the internal haze value to the overall haze value is 50% or more.
[Selection figure] None

Description

  The present invention relates to an antiglare film for liquid crystal displays used by being attached to the outermost surface on the image display side of a liquid crystal display, and a liquid crystal display including the same. In particular, the present invention relates to an antiglare film that suppresses glare when installed on a liquid crystal display that displays a high-definition image, and suppresses a decrease in black density and a deterioration in image definition, and a liquid crystal display including the antiglare film.

  In a liquid crystal display, if light from the outside is reflected without diffusing on its surface (display surface), a front image is reflected there, and the internal image becomes very difficult to see. An antiglare film is disposed to diffuse light from the outside. The general anti-glare film has an irregular shape on the surface of the anti-glare layer so that light can diffuse and express an anti-glare action in any type. It is necessary to enlarge the shape. However, when the unevenness increases, there is a problem that the haze value of the antiglare layer increases, and the image clarity decreases accordingly. Furthermore, the antiglare film has a problem in that a sparkle called scintillation is generated on the film surface and visibility of the display screen is lowered.

As an attempt to solve such a problem, an antiglare film in which scintillation is suppressed based on an internal scattering effect by focusing on internal haze has been disclosed (for example, see Patent Document 1). That is, the antiglare film is provided with an antiglare layer on a transparent support, and the haze of the antiglare layer is 4.0 to 50%, and the haze is 1.0% or more of internal scattering, It is constituted by the sum of the surface scattering of 3.0% or more.
JP 2001-91707 A (page 2, page 3 and page 8)

  However, in the antiglare film described in Patent Document 1, since the shape, interval, and the like are not taken into consideration for the fine irregularities on the surface of the antiglare layer, the diffusion of light on the surface of the antiglare layer is sufficiently controlled. I couldn't. For this reason, when an anti-glare film is used for a liquid crystal display, the glare on the surface of the anti-glare film cannot be sufficiently suppressed, and the required image visibility cannot be obtained. Furthermore, the haze value (total haze or total haze) of the antiglare film is specifically 15.0 to 40.1% (Examples 1 to 1 described in Table 1 on page 8 of Patent Document 1). 4). For this reason, the antiglare film has a problem that the light transmittance is poor, and as a result, the image definition is inferior and the black density of the image is lowered. In particular, in the case of a high-definition liquid crystal display, there is a problem that image visibility is insufficient.

  Accordingly, an object of the present invention is to provide an antiglare film for a liquid crystal display that can suppress glare, increase black density and image sharpness, and improve image visibility. And providing a liquid crystal display including the same.

  In order to achieve the above object, an antiglare film for a liquid crystal display according to a first invention comprises an active energy ray-curable resin, a photopolymerization initiator, and translucent organic fine particles on a transparent substrate made of a cellulosic material. An antiglare hard coat layer made of a cured product of the composition for forming an antiglare hard coat layer containing s is formed. And the refractive index difference of the hardened | cured material of the binder containing the said active energy ray hardening-type resin and a photoinitiator and translucent organic fine particles is adjusted to 0-0.05, and the surface of an anti-glare hard-coat layer The arithmetic average roughness (Ra) measured in accordance with JIS B 0601-1994 is 0.01 to 0.30 μm, the average interval (Sm) of irregularities is 10 to 300 μm, and the overall haze value is 10%. The ratio of the internal haze value to the overall haze value is 50% or more.

  In the antiglare film for a liquid crystal display according to the second invention, in the first invention, the translucent organic fine particles are formed of a (meth) acrylic resin, a styrene-acrylic copolymer resin, or a cross-linked product thereof. It is characterized by that.

  The antiglare film for a liquid crystal display of the third invention is the ratio of the average particle diameter (a) of the translucent organic fine particles to the film thickness (A) of the antiglare hard coat layer in the second invention, a / A is 0.3 to 1.5.

  In any one of the first to third inventions, the antiglare film for a liquid crystal display according to the fourth invention has a refractive index higher than the refractive index of the antiglare hard coat layer on the antiglare hard coat layer. The low refractive index layer is provided.

  A liquid crystal display according to a fifth aspect is characterized by comprising the antiglare film for a liquid crystal display according to the first aspect on the outermost surface on the image display side.

According to the present invention, the following effects can be exhibited.
In the antiglare film for a liquid crystal display according to the first invention, the refractive index difference between the cured product of the binder containing the active energy ray-curable resin and the photopolymerization initiator and the translucent organic fine particles is 0 to 0.05. Adjusted. For this reason, light scattering in the antiglare hard coat layer can be suppressed to improve the light transmission, and the image definition and the black density of the image can be improved. In addition, the arithmetic average roughness (Ra) of the antiglare hard coat layer surface is set to an appropriate range of 0.01 to 0.30 μm and the average interval of unevenness (Sm) is set to 10 to 300 μm. Diffusion is controlled, and excessive scattering of light is suppressed and glare is suppressed. In addition, when the overall haze value is 10% or less, the light transmittance is improved, and the image definition and the black density of the image can be improved. Moreover, when the ratio of the internal haze value to the overall haze value is 50% or more, it is possible to improve the balance of antiglare property, glare and image definition.

  Therefore, the antiglare film can suppress glare when used in a liquid crystal display, can increase black density and image definition, and can improve image visibility.

  In the antiglare film for a liquid crystal display of the second invention, the translucent organic fine particles are formed of a (meth) acrylic resin, a styrene-acrylic copolymer resin or a cross-linked product thereof. Therefore, in addition to the effects of the first invention, the refractive index of the light-transmitting organic fine particles can be easily adjusted by the type and composition of the resin.

  In the antiglare film for a liquid crystal display of the third invention, the ratio a / A of the average particle diameter (a) of the translucent organic fine particles to the film thickness (A) of the antiglare hard coat layer is 0.3 to 1. .5. For this reason, in addition to the effect of 2nd invention, the unevenness | corrugation in the anti-glare hard-coat layer surface can be easily set so that it may become the range of said Ra and Sm.

  In the antiglare film for a liquid crystal display according to the fourth invention, a low refractive index layer having a refractive index lower than that of the antiglare hard coat layer is provided on the antiglare hard coat layer. Therefore, in addition to the effects of any one of the first to third inventions, the antiglare film can exhibit an antireflection effect.

  In the liquid crystal display of the fifth invention, the antiglare film for a liquid crystal display of the first invention is provided on the outermost surface on the image display side. Therefore, the effect of the first invention can be exhibited in the liquid crystal display, and the effect can be effectively exhibited particularly in a high-definition liquid crystal display.

Hereinafter, embodiments that are considered to be the best modes of the present invention will be described in detail.
The antiglare film for a liquid crystal display of the present embodiment (hereinafter also simply referred to as an antiglare film) is formed on a transparent substrate made of a cellulosic material, an active energy ray-curable resin, a photopolymerization initiator, and a translucency. An antiglare hard coat layer made of a cured product of a composition for forming an antiglare hard coat layer containing organic fine particles is formed. This anti-glare film is used by being disposed on the outermost surface on the side for displaying an image of a liquid crystal display, particularly a high-definition liquid crystal display.

  Such an antiglare film is characterized by the following points. That is, the refractive index difference between the cured product of the binder containing the active energy ray-curable resin and the photopolymerization initiator and the translucent organic fine particles is 0 to 0.05. The arithmetic average roughness (Ra) measured in accordance with JIS B 0601-1994 on the surface of the antiglare hard coat layer is 0.01 to 0.30 μm, and the average interval (Sm) of the unevenness is 10 to 300 μm. It is. Furthermore, the overall haze value of the antiglare film is 10% or less, and the ratio of the internal haze value to the overall haze value is 50% or more. Note that the difference in refractive index between the cured binder and the light-transmitting organic fine particles being zero means that the refractive index of the cured binder and the light-transmitting organic fine particles are the same.

  In order to improve the image sharpness and improve the black density (black spots) and the contrast of the images on the liquid crystal display, the internal generated due to the refractive index difference between the cured product of the translucent organic fine particles and the binder It is necessary to reduce the haze value as much as possible. Therefore, the refractive index difference between the refractive index of the binder cured product and the refractive index of the translucent organic fine particles is set to 0 to 0.05, preferably 0 to 0.03, and more preferably 0 to 0.01. By setting the difference in refractive index between the cured binder and the light-transmitting organic fine particles in such a range, light scattering inside the anti-glare hard coat layer can be suppressed, and the light transmittance can be reduced. Can be improved. When this difference in refractive index is larger than 0.05, light scattering inside the antiglare hard coat layer is increased, and transmission of light is hindered, resulting in deterioration of image definition. When adjusting the difference in refractive index, it is mainly done by specifying the type of translucent organic fine particles and changing the refractive index, but adding additional components such as inorganic fine particles to the binder to cure the binder A method of changing the refractive index of a material is also possible as long as the deterioration of physical properties due to the addition of an additional component does not become a problem.

  On the other hand, the antiglare property is achieved mainly by the external haze value controlled by the unevenness of the antiglare hard coat layer surface (outer surface). However, since glare occurs when the external haze value is too high, the arithmetic average roughness (Ra) of the unevenness and the average interval (Sm) of the unevenness are set to the above-described ranges. Thus, by reducing the difference in refractive index between the cured binder and the light-transmitting organic fine particles, the light transmission can be maintained, and at the same time, by reducing Ra and Sm, the surface of the antiglare hard coat layer can be maintained. Can promote the diffusion of light, and can improve the image definition and suppress the glare in a well-balanced manner. Functional layers such as a low refractive index layer and a polarizing layer can be formed on the antiglare hard coat layer, and an antireflection function and a polarizing function can be exhibited.

  In the antiglare film, in order for the antiglare hard coat layer to exhibit light diffusibility, it is necessary to adjust the uneven shape on the surface of the antiglare hard coat layer. That is, regarding the uneven shape on the surface of the antiglare hard coat layer, the arithmetic average roughness (Ra) on the surface of the antiglare hard coat layer is 0.01 to 0.30 μm and 0.01 to 0.28 μm. Is preferable, and it is most preferable that it is 0.05-0.25 micrometer. Similarly, the ten-point average roughness (Rz) specified in JIS B 0601-1994 is preferably 2.0 μm or less, more preferably 0.1 to 1.5 μm, and more preferably 0.5 to 1.3 μm. Most preferably. By setting the Ra and Rz of the uneven surface of the antiglare hard coat layer to such a range, there is no glare when the antiglare film is arranged on the liquid crystal display for image display, and the liquid crystal display It is possible to ensure good image visibility.

  When Ra is less than 0.01 μm, the light diffusibility on the surface of the antiglare hard coat layer is insufficient, and the antiglare property deteriorates. On the other hand, when Ra exceeds 0.30 μm, the haze value of the antiglare hard coat layer increases, whitening occurs, and the image definition deteriorates. Furthermore, when Rz exceeds 2.0 μm, the haze value of the antiglare hard coat layer tends to increase, and the image clarity decreases.

  Moreover, the average space | interval (Sm) of the unevenness | corrugation in the glare-proof hard-coat layer surface needs to be 10-300 micrometers, it is preferable that it is 30-270 micrometers, and it is especially preferable that it is 100-250 micrometers. If this Sm is in the range of 10 to 300 μm, glare is suppressed when an antiglare film is installed on a liquid crystal display for image display, and good image visibility of the liquid crystal display can be secured. Become. Here, Sm represents the interval between the irregularities in the direction along the surface of the antiglare hard coat layer, and this interval is important for suppressing glare particularly on the surface of the antiglare hard coat layer. When Sm is less than 10 μm, the light diffusibility on the surface of the antiglare hard coat layer is insufficient and glare cannot be sufficiently suppressed. On the other hand, when Sm exceeds 300 μm, the haze value of the antiglare hard coat layer increases and whitening occurs, and the desired image definition cannot be obtained.

About the relationship between said arithmetic mean roughness (Ra) and the average space | interval (Sm) of an unevenness | corrugation, it is preferable that ratio of Sm / Ra is 1000-1400. That is, the interval of the unevenness is about 10 ³ times the height of the irregularity, carefully first diffusion of light irregularity is formed in such a shape improves the antiglare property, suppress glare can do. When the ratio of Sm / Ra is smaller than 1000, the interval between the projections and depressions with respect to the height of the projections and depressions is narrowed, the haze value is likely to increase, and the image definition is lowered. On the other hand, when the ratio of Sm / Ra is larger than 1400, the distance between the unevenness with respect to the unevenness height becomes too wide, and the light diffusion tends to be insufficient.

  A haze value is adopted as an index of antiglare property. The haze value (haze value, haze value) is measured in accordance with JIS K 7136, and is a value obtained by dividing the scattered light transmittance by the total light transmittance in percentage. The haze value of the antiglare film, that is, the overall haze value is the external haze value resulting from external scattering due to the irregularities on the surface of the antiglare hard coat layer, and the transparent organic fine particles and binder present inside the antiglare hard coat layer It is classified into an internal haze value due to internal scattering caused by a difference in refractive index from the cured product. The overall haze value is 10% or less, preferably 8% or less, more preferably 5% or less, and most preferably 1.5 to 5%. When the total haze value is larger than 10%, the anti-glare film is disposed on the outermost surface of the liquid crystal display, so that the contrast of the image is lowered or the image becomes white.

  The antiglare film aims to improve the image definition while maintaining the antiglare property and suppressing the glare. Therefore, it is important to adjust the external haze value and the internal haze value. Since the antiglare property is mainly caused by the external haze value, the surface unevenness needs to be increased to some extent in order to exhibit the antiglare property. On the other hand, since the image definition and the glare are correlated with the external haze value and the internal haze value, it is necessary to keep both low. From such a viewpoint, the ratio of the internal haze value needs to be 50% or more of the entire haze, and is preferably 55 to 75%. When this ratio is less than 50%, the contribution of the external haze value is increased, which causes glare.

Next, each component of the antiglare film will be described in order.
The cellulosic material that forms the transparent substrate is a material that has excellent transparency and excellent optical transparency and no optical anisotropy. For this reason, it is the most suitable thing as a base material of the anti-glare film arrange | positioned and used on the surface of a liquid crystal display. As the cellulose material, derivatives of triacetyl cellulose (TAC), diacetyl cellulose, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, nitrocellulose, etc. can be used. Most preferably it is used. The thickness of the transparent substrate is usually 10 to 5000 μm, preferably 25 to 1000 μm, more preferably 35 to 500 μm. When this thickness is less than 10 μm, the handleability of the antiglare film tends to deteriorate and the strength tends to decrease. On the other hand, when the thickness is greater than 5000 μm, the thickness becomes unnecessarily thick, and the handleability of the antiglare film is deteriorated.

  Next, the antiglare hard coat layer will be described. The antiglare hard coat layer has irregularities on its surface, and light is reflected and diffused on the irregularities (surface diffusibility), and has a function capable of exhibiting antiglare properties. This antiglare hard coat layer is formed by curing an antiglare hard coat layer forming composition containing translucent organic fine particles in a binder containing an active energy ray-curable resin and a photopolymerization initiator, The hard coat layer has required strength and hardness. Here, the binder or the antiglare hard coat layer forming composition is usually mixed with a diluent solvent, and the viscosity of the binder or the antiglare hard coat layer forming composition is adjusted.

  The active energy ray-curable resin requires a polymerizable component as a constituent component, and may contain other components as necessary. Examples of such polymerizable components include monofunctional monomers, polyfunctional monomers, oligomers having vinyl groups and (meth) acryloyl groups, and polymers having vinyl groups and (meth) acryloyl groups. Or 2 or more types are selected and used. Other components include photodegradable or thermal decomposable polymerization initiators, oligomers that do not contain vinyl groups or (meth) acryloyl groups (hereinafter referred to as non-polymerizable oligomers), vinyl groups or (meth) acryloyl groups. Polymer (hereinafter referred to as non-polymerizable polymer), metal oxide, surfactant, diluent solvent, photosensitizer, stabilizer, ultraviolet absorber, infrared absorber, antioxidant, surface conditioner, A particle dispersant or the like is used.

  Specific examples of the monofunctional monomer include methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) acrylate, Isobutyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isodecyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, (meth) acrylic Cetyl acid, isobornyl (meth) acrylate, cyclohexyl (meth) acrylate, tricyclodecyl (meth) acrylate, benzyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, dicyclopentenyl (meth) acrylate Oxyethyl, (meth) acrylic acid dicyclopentanyl, (meth) acrylic acid Tamethylpiperidyl, (meth) acrylic acid ethyl hexahydrophthalate, (meth) acrylic acid 2-hydroxypropyl ethyl phthalate, (meth) acrylic acid 2-hydroxybutyl, (meth) acrylic acid butoxyethyl, (meth) acrylic (Meth) acrylic acid esters such as phenoxyethyl acid, methoxydiethylene glycol (meth) acrylate, methoxytriethylene glycol (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, styrene, α-methylstyrene, p-methoxy Styrene, m-methoxystyrene, di-t-butyl fumarate, di-n-butyl fumarate, diethyl fumarate, monomethyl itaconate, dimethyl itaconate, monoethyl itaconate, diethyl itaconate, N-isopropylacrylamide, N -Vinyl-2-pyrrolidone and the like are preferable.

  Examples of the polyfunctional monomer include esterified products of polyhydric alcohol and (meth) acrylic acid, polyfunctional polymerizable compounds containing two or more (meth) acryloyl groups such as urethane-modified (meth) acrylate, and the like. Examples of the polyhydric alcohol include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, polypropylene glycol, propanediol, butanediol, pentanediol, Divalent alcohols such as hexanediol, neopentyl glycol, 2-ethyl-1,3-hexanediol, 2,2′-thiodiethanol, 1,4-cyclohexanedimethanol; trimethylolpropane, glycerol, pentaerythritol, di Examples thereof include trivalent or higher alcohols such as glycerol, dipentaerythritol, and ditrimethylolpropane.

  The urethane-modified (meth) acrylate can be obtained by a urethanization reaction between an organic isocyanate having a plurality of isocyanate groups in one molecule and a (meth) acrylic acid derivative having a hydroxyl group. Examples of organic isocyanates having a plurality of isocyanate groups in one molecule include two isocyanates in one molecule such as hexamethylene diisocyanate, isophorone diisocyanate, tolylene diisocyanate, naphthalene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, and dicyclohexylmethane diisocyanate. Organic isocyanate having a group, organic isocyanate having three isocyanate groups in one molecule obtained by subjecting these organic isocyanates to isocyanurate modification, adduct modification, biuret modification, and the like.

  Among them, di (meth) acrylic acid hexanediol, di (meth) acrylic acid neopentyl glycol, di (meth) acrylic acid diethylene glycol, di (meth) acrylate from the viewpoint of improving the strength of the cured product (coating film) and availability. (Meth) acrylic acid esters such as tripropylene glycol (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, hexamethylene diisocyanate And an adduct of 2-hydroxyethyl (meth) acrylate, an adduct of isophorone diisocyanate and 2-hydroxyethyl (meth) acrylate, an adduct of tolylene diisocyanate and 2-hydroxyethyl (meth) acrylate, Adduct-modified isophorone diiso Aneto and (meth) adducts of adduct and biuret modified isophorone diisocyanate and 2-hydroxyethyl (meth) acrylate and 2-hydroxyethyl acrylate is preferable. Furthermore, as the active energy ray curable resin, it is preferable to use a urethane acrylate resin from the viewpoint of good flexibility when the film is thickened.

  The translucent organic fine particles are for exhibiting a light diffusing function in the antiglare hard coat layer, an antiglare function by forming irregularities on the surface, and the like. The translucent organic fine particles are formed from a resin obtained by polymerizing at least one monomer selected from, for example, vinyl chloride, (meth) acrylic monomer, styrene, and ethylene. As such translucent resin fine particles, a (meth) acrylic resin, a styrene-acrylic monomer copolymer resin (referred to as a styrene-acrylic copolymer resin) or a cross-linked product thereof is used because the refractive index can be easily adjusted. Preferably it is formed. In the case of a styrene-acrylic copolymer resin, it is more preferable in that the refractive index can be arbitrarily adjusted by changing the copolymer composition of both monomers. Here, in addition to styrene-acrylic copolymer resin or (meth) acrylic resin (refractive index 1.49), vinyl chloride resin, polystyrene resin (refractive index 1.54), polyethylene resin, melamine resin (refractive index 1.57). It is also possible to form translucent organic fine particles from a resin containing a polycarbonate resin or the like.

  The light-transmitting organic fine particles are preferably monodispersed with a uniform particle diameter in order to uniformly diffuse or scatter light in and on the antiglare hard coat layer. The average particle diameter of the light-transmitting organic fine particles is preferably 0.1 to 20 μm, more preferably 0.5 to 10 μm, and particularly preferably 1 to 10 μm in order to sufficiently exhibit its function. When this average particle diameter is less than 0.1 μm, the antiglare property on the surface of the antiglare hard coat layer tends to be insufficient. On the other hand, when it exceeds 20 μm, the haze value of the antiglare hard coat layer becomes too high, and the transparency tends to be impaired. Here, the average particle diameter is a value calculated from a particle number distribution obtained by measuring the distribution by a Coulter counter method, converting the measured distribution into a particle number distribution. The Coulter counter method is a particle size measurement method using electric resistance, and is a method of measuring an average particle diameter by measuring a change in electric resistance between two electrodes that occurs when particles pass through pores. .

  The ratio a / A of the average particle diameter (a) of the translucent organic fine particles to the film thickness (A) of the antiglare hard coat layer is preferably 0.3 to 1.5, and preferably 0.5 to 1. 1 is more preferable. When this ratio a / A is less than 0.3, the amount of translucent organic fine particles added to form desired irregularities on the surface of the antiglare hard coat layer increases, and the haze value increases. Image sharpness tends to decrease. On the other hand, when it exceeds 1.5, the unevenness on the surface of the antiglare hard coat layer becomes too large, so that the haze value becomes large, the image sharpness deteriorates, and the glare becomes undesirably strong.

  The content of the translucent organic fine particles is usually 1 to 70 parts by weight, preferably 2 to 60 parts by weight, more preferably 3 to 50 parts by weight, and most preferably 10 to 100 parts by weight of the active energy ray-curable resin. -40 mass parts. When the content of the light-transmitting organic fine particles is less than 1 part by mass, the function of the light-transmitting organic fine particles cannot be sufficiently exhibited, and satisfactory antiglare properties cannot be obtained. On the other hand, when the amount is more than 70 parts by mass, the haze value of the antiglare hard coat layer becomes too high, and when the antiglare film is placed on the surface of the liquid crystal display, whitening or the like occurs and image recognizability decreases. .

  The photopolymerization initiator is used for initiating polymerization by irradiating an active energy ray-curable resin with active energy rays such as ultraviolet rays, and a known compound is used. Examples of such photopolymerization initiators include benzophenones, acetophenones, α-amyloxime esters, Michler benzoyl benzoate, tetramethylchuram monosulfide, and thioxanthones. Specifically, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropane- 1-one, 1- [4- (2-hydroxyethoxy) phenyl] -2-hydroxy-2-methyl-1-propan-1-one, benzoin, 2,2-dimethoxy-1,2-diphenylethane-1 -One, benzophenone, [4- (methylphenylthio) phenyl] phenylmethanone, 4-hydroxybenzophenone, 4-phenylbenzophenone, 3,3 ', 4,4'-tetra (t-butylperoxycarbonyl) benzophenone, 2-chlorothioxanthone, 2,4-diethylthioxanthone, α-amyloxime ester, Michler Emissions benzoyl benzoate, tetramethylthiuram monosulfide, and the like.

  The content of the photopolymerization initiator is preferably 0.01 to 20 parts by mass and more preferably 1 to 10 parts by mass with respect to 100 parts by mass of the active energy ray-curable resin. When this content is less than 0.01 part by mass, the cured product (coating film) obtained from the antiglare hard coat layer forming composition is not completely cured and is not preferable because curing is insufficient. . On the other hand, if it exceeds 20 parts by mass, curing is sufficient, but no further effect can be expected, and the amount is unnecessarily large and wasted.

  The dilution solvent used for the preparation of the binder or antiglare hard coat layer forming composition is used to adjust the viscosity of the binder or antiglare hard coat layer forming composition, and is non-polymerizable. If there is no particular limitation. With such a dilution solvent, the composition for forming an antiglare hard coat layer can be easily applied onto a transparent substrate.

  Examples of the diluent solvent include toluene, xylene, ethyl acetate, propyl acetate, butyl acetate, methyl cellosolve, ethyl cellosolve, ethyl cellosolve acetate, propylene glycol monomethyl ether acetate, methyl alcohol, ethyl alcohol, isopropyl alcohol, butyl alcohol, Examples include diacetone alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, hexane, heptane, octane, decane, dodecane, propylene glycol monomethyl ether, and 3-methoxybutanol.

  Furthermore, in order to make the surface of the antiglare hard coat layer have no defects and a uniform coating surface, it is preferable to use a non-swelling solvent of translucent organic fine particles. The non-swelling solvent means a solvent that does not swell the translucent organic fine particles. As this non-swellable solvent, an alcohol solvent is preferable, and the amount added is preferably 10 to 60% by mass in the total amount of the solvent. When this addition amount is less than 10% by mass, it becomes difficult to form a uniform antiglare hard coat layer. On the other hand, when it exceeds 60 mass%, the dispersibility of the translucent organic fine particles deteriorates, and it becomes difficult to form a uniform antiglare hard coat layer.

  After applying the above anti-glare hard coat layer forming composition on a transparent substrate, the anti-glare hard coat layer can be laminated on the transparent support by irradiating and curing the active energy ray. it can. As a method of applying the antiglare hard coat layer forming composition on the transparent substrate, a roll coating method, a spin coating method, a dip coating method, a brush coating method, a spray coating method, a bar coating method, a knife coating method, Any known method such as a die coating method, a gravure coating method, a curtain flow coating method, a reverse coating method, a kiss coating method, or a comma coating method may be employed. At the time of application, in order to improve the adhesion, it is preferable to perform a pretreatment such as a corona discharge treatment on the surface of the transparent substrate in advance.

As an active energy ray source used for irradiation of active energy rays, for example, a high pressure mercury lamp, a halogen lamp, a xenon lamp, a nitrogen laser, an electron beam accelerator, a radioactive element or the like is used. It is preferable that the irradiation amount of an active energy ray is 50-5000 mJ / cm < ² > as an integrated light quantity in ultraviolet wavelength 365nm. When the irradiation amount is less than 50 mJ / cm ² , curing of the composition for forming an antiglare hard coat layer becomes insufficient, which is not preferable. On the other hand, when it exceeds 5000 mJ / cm ² , the active energy ray-curable resin tends to be colored, which is not preferable.

  Next, the low refractive index layer has a refractive index lower than that of the antiglare hard coat layer and exhibits an antireflection function on the surface thereof. As a material for forming the low refractive index layer, for example, a resin material such as an ultraviolet curable acrylic resin, a hybrid material in which inorganic fine particles such as colloidal silica are dispersed in the resin, tetraethoxysilane, titanium tetraethoxide, etc. Examples thereof include sol-gel materials using metal alkoxides such as metal alkoxides. In particular, it is known that a compound having a fluorine atom exhibits a low refractive index. Specifically, a polymerizable monomer having a fluoroalkyl group in the side chain, for example, a fluorine-containing alkyl ester of (meth) acrylic acid is used. Examples thereof include a polymer obtained by polymerization and a polymer obtained by polymerizing fluoroalkylstyrene. Furthermore, as a method for efficiently reducing the refractive index, a method in which hollow silica fine particles are blended with a compound containing a fluorine atom as a binder may be mentioned.

  The thickness of the low refractive index layer is not particularly limited, but is preferably ¼ (about 100 nm) of the visible light wavelength because surface reflection is reduced by the interference effect and the transmittance is improved. Further, from the viewpoint of obtaining a suitable antireflection effect, the low refractive index layer preferably has a low refractive index, but if it is too low, the reflected light is colored, which is not preferable. Therefore, in consideration of antireflection and coloring prevention, the refractive index of the low refractive index layer is preferably 1.30 to 1.50, and particularly when the antireflection effect is emphasized, More preferably, it is 1.30 to 1.45.

  The anti-glare film configured as described above is used by being arranged on the outermost surface on the liquid crystal display image display side, can exhibit anti-glare properties, and can further suppress glare. The black density and image definition of the image can be improved. Specifically, the value of the image sharpness measured through an optical comb having a width of 2 mm using an image sharpness measuring device based on JIS K 7105-1981 is preferably 50% or higher, more preferably 55% or higher. And the value of image definition measured by 60 ° reflection is preferably 60% or less, more preferably 55% or less. Note that the upper limit of these image definition values is 100%. In this case, it is possible to improve the image clarity when viewed from the front and oblique directions. When the value of the image clarity is less than 50%, the image clarity is undesirably lowered when the antiglare film is disposed on the outermost surface of the liquid crystal display. Moreover, when the value of the image clarity measured by 60 ° reflection exceeds 60%, the antiglare property is poor when the antiglare film is disposed on the outermost surface of the liquid crystal display and the liquid crystal display image is viewed. Become.

  Furthermore, the visibility reflectance showing the reflection of the antiglare film is preferably 5% or less, and more preferably 3.5% or less. This visibility reflectance is obtained, for example, by measuring the reflectance (%) using a spectrophotometer equipped with an integrating sphere reflectance measuring device. When a low refractive index layer is provided on the antiglare hard coat layer, the visibility reflectance can be sufficiently suppressed.

  In addition, the 60 ° gloss value representing the surface gloss is preferably 100% or less, more preferably 90% or less, and most preferably 10 to 80%. Here, the 60 ° gloss value is a value obtained by measuring in accordance with JIS K7105, measuring the specular reflection component with a light receiver by applying light from a standard light source to the sample at a specified angle. The reference surface is the glass surface, and its value is 100%. When the gloss value exceeds 100%, the antiglare film has insufficient antiglare properties, and the effect of preventing image reflection when the antiglare film is placed on the surface of the liquid crystal display becomes insufficient.

  Next, a liquid crystal display, in particular, a high-definition liquid crystal display is configured by providing the above-described antiglare film on the outermost surface on the liquid crystal display image display side. Here, high definition means that the pixels forming the image are small and the resolution of the displayed image is high. Specifically, the pixel density per inch of the image is 100 ppi (Pixel Per Inch) or more. Means that. Such a liquid crystal display is provided with an antiglare film, so that reflection of an outside scene can be suppressed and image visibility can be improved. Furthermore, since the unevenness on the surface of the antiglare hard coat layer is set to a small range as described above with respect to the pixel size of the liquid crystal display, there is no lens effect and the image visibility is excellent. Specific examples of liquid crystal displays include images on personal computers, word processors, televisions, mobile phones, mobile terminals, game machines, automatic cash withdrawal and deposit devices, cash dispensers, vending machines, navigation devices, security system terminals, etc. What is displayed.

  In addition to the liquid crystal display, the antiglare film can be applied to a toner display used for a plasma display, an electroluminescence display, a field emission display, a projection display, electronic paper, a CRT (CRT), and the like. Furthermore, it is also possible to apply the antiglare film to a display for display, for example, a glass case such as a showcase or a showwindow, or a plastic case.

The actions and effects exerted by the above embodiment are collectively described below.
In the antiglare film in the present embodiment, the refractive index difference between the cured product of the binder containing the active energy ray-curable resin and the photopolymerization initiator and the light-transmitting organic fine particles is adjusted to 0 to 0.05. . For this reason, the diffusion of light is suppressed inside the antiglare hard coat layer, the light transmittance is improved, and the clarity of the image and the clarity of the black density are improved. Furthermore, when Ra of the antiglare hard coat layer surface is 0.01 to 0.30 μm and Sm is 10 to 300 μm, the height and spacing of the surface irregularities becomes appropriate for light diffusion, Excessive light scattering is suppressed and glare is suppressed. In addition, when the overall haze value is 10% or less, the ratio of transmitted light is increased, and the clarity of the image of the liquid crystal display and the clarity of the black density are improved. In addition, since the ratio of the internal haze value to the overall haze value is 50% or more, the diffusion of light on the surface of the antiglare hard coat layer is suppressed compared to the diffusion of light inside the antiglare hard coat layer, The sharpness of the image can be improved while suppressing the glare.

  Therefore, when the antiglare film is disposed on the outermost surface of the liquid crystal display, it is possible to suppress glare while maintaining the antiglare property, and to increase the black density and the image sharpness. Visibility can be improved.

  -The translucent organic fine particles are formed of (meth) acrylic resin, styrene-acrylic copolymer resin, or a cross-linked product thereof, so that the refractive index of the translucent organic fine particles can be easily adjusted depending on the type and composition of the resin. can do. In particular, in the case of a styrene-acrylic copolymer resin or a crosslinked product thereof, the refractive index of the translucent organic fine particles can be more easily adjusted by changing the copolymer composition.

  The ratio a / A of the average particle diameter (a) of the translucent organic fine particles to the film thickness (A) of the antiglare hard coat layer is 0.3 to 1.5, so that the antiglare hard coat is The unevenness on the surface of the layer can be easily set so as to be in the range of Ra and Sm.

-By providing a low refractive index layer having a refractive index lower than the refractive index of the antiglare hard coat layer, the antiglare film can exhibit an antireflection effect.
In the liquid crystal display, since the anti-glare film is provided on the outermost surface on the image display side, the above-mentioned effect of the anti-glare film can be exhibited in the liquid crystal display, and particularly a high-definition liquid crystal display The effect can be effectively exhibited.

Hereinafter, the embodiment will be described more specifically with reference to production examples, examples and comparative examples, but the present invention is not limited to the scope of these examples.
The surface roughness, haze value, image definition value, glare, black density, and visibility reflectance in each example were measured by the methods described below.
(1) Surface Roughness According to the provisions of JIS B 0601-1994, using a surface roughness measuring machine manufactured by Kosaka Laboratories Co., Ltd., Surfcoder SE500, under conditions of a scanning range of 4 mm and a scanning speed of 0.2 mm / s The arithmetic average roughness Ra (μm), the average interval Sm (μm) of the unevenness, and the ten-point average roughness Rz (μm) were measured in conformity.
(2) Haze value Using a haze meter [NDH2000, manufactured by Nippon Denshoku Industries Co., Ltd.], the haze value (%) as an optical property was measured. The internal haze value is a haze value measured by dropping water droplets on the surface of the antiglare hard coat layer and pressing glass there.
(3) Value of image definition An image is measured through an optical comb having a width of 2 mm using an image definition measuring device (image clarity measuring device manufactured by Suga Test Instruments Co., Ltd., ICM-1T) based on JIS K 7105-1981. The sharpness value (%) and the image sharpness value (%) measured at 60 ° reflection were measured.
(4) Glare An anti-glare film was placed on the outermost surface on the image display side of a high-definition liquid crystal touch panel as a high-definition liquid crystal display, and the glare was measured visually and evaluated in the following three stages.

3: No glare, 2: Some glare, 1: Glare.
(5) Black density A black adhesive film was pasted on the back side of the sample of the antiglare film pasted on the glass, and the blackness in a state where the fluorescent lamp was reflected was evaluated.

○: Black is conspicuous, Δ: Some white parts are present but black as a whole, ×: White as a whole.
(6) Visibility reflectance In order to eliminate the back surface reflection of the measurement surface, the back surface is roughened with sandpaper, and a spectrophotometer equipped with an integrating sphere reflectance measurement device [manufactured by JASCO Corporation, product name: U-best50] Was used to measure the reflectance (%) and the value was corrected by the visibility.
(Production Example 1, Preparation of Modified Hollow Silica Sol as Inorganic Fine Particles)
A modified hollow silica sol was prepared according to the following first to fifth steps.

As the first step, a silica sol having an average particle diameter of 5 nm of silica (SiO ₂ ) having a concentration of 20% by mass and pure water were mixed to prepare a reaction mother liquor and heated to 80 ° C. The pH of this reaction mother liquor is 10.5, and 1.17% by mass sodium silicate aqueous solution as SiO ₂ and 0.83% by mass sodium aluminate aqueous solution as alumina (Al ₂ O ₃ ) are added to the reaction mother liquor. Added simultaneously. Meanwhile, the temperature of the reaction mother liquor was kept at 80 ° C. The pH of the reaction mother liquor rose to 12.5 immediately after the addition of sodium silicate and sodium aluminate and remained almost unchanged thereafter. After completion of the addition, the reaction mother liquor was cooled to room temperature and filtered through an ultrafiltration membrane to prepare a SiO ₂ .Al ₂ O ₃ primary particle dispersion (core particle dispersion) having a solid content concentration of 20% by mass.

Next, as a second step, pure water is added to the SiO ₂ .Al ₂ O ₃ primary particle dispersion and heated to 98 ° C., and an aqueous sodium sulfate solution having a concentration of 0.5 mass% is maintained while maintaining this temperature. Added. Subsequently, an aqueous solution of sodium silicate having a concentration of 1.17% by mass as SiO ₂ and an aqueous solution of sodium aluminate having a concentration of 0.5% by mass as Al ₂ O ₃ were added, and a composite oxide fine particle dispersion (the core particles were subjected to 1) A fine particle dispersion having a silica coating layer was obtained. And this was filtered with the ultrafiltration membrane, and it was set as the complex oxide fine particle dispersion liquid of solid content concentration 13 mass%.

  As a third step, pure water was added to this composite oxide fine particle dispersion, and concentrated hydrochloric acid (concentration 35.5% by mass) was added dropwise to adjust the pH to 1.0, followed by dealumination. Subsequently, while adding 10 L of hydrochloric acid aqueous solution of pH 3 and 5 L of pure water, the aluminum salt was separated with an ultrafiltration membrane to obtain an aqueous dispersion of silica-based fine particles (1) having a solid content concentration of 20% by mass.

As the fourth step, a mixture of the aqueous dispersion of the silica-based fine particles (1), pure water, ethanol and 28% by mass ammonia water was heated to 35 ° C., and then ethyl silicate (SiO ₂ concentration of 28% by mass). %) Was added to form a silica coating (second silica coating layer). Subsequently, while adding 5 L of pure water, it was filtered through an ultrafiltration membrane to prepare a dispersion of silica-based fine particles (2) having a solid content concentration of 20% by mass.

Finally, as a fifth step, the dispersion of silica-based fine particles (2) was again subjected to hydrothermal treatment at 200 ° C. for 11 hours. Then, it filtered with the ultrafiltration membrane, adding pure water 5L, and adjusted solid content concentration to 20 mass%. Then, using an ultrafiltration membrane, the dispersion medium of this dispersion was replaced with ethanol to obtain an organosol having a solid content concentration of 20% by mass. This organosol was an organosol (hollow silica sol A) in which hollow silica fine particles having an average particle diameter of 60 nm and a specific surface area of 110 m ² / g were dispersed.

200 g of the hollow silica sol A (silica solid content concentration: 20% by mass) was prepared, and the solvent was replaced with methanol in an ultrafiltration membrane. 100 g of organosol having a SiO ₂ content of 20% by mass (water content was SiO ₂ content) 0.5 mass%) was prepared. Thereto, 28 mass% aqueous ammonia solution was added to 100 g of the organosol so as to be 100 ppm as ammonia, and mixed well. Further, γ-acryloyloxypropyltrimethoxysilane [manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KBM5103 3.6 g was added to obtain a reaction solution. This was heated to 50 ° C. and heated at 50 ° C. for 6 hours with stirring. After completion of the heating, the reaction solution was cooled to room temperature, and further the solvent was replaced with isopropyl alcohol by a rotary evaporator to obtain an organosol composed of coated hollow fine particles having a SiO ₂ concentration of 20% by mass. This organosol has an average particle size of 60 nm, a refractive index of 1.25, a porosity of 40 to 45%, a specific surface area of 130 m ² / g, and a mass reduction ratio by thermal mass measurement (TG) of 3.6%. It was an organosol in which hollow silica fine particles were dispersed.
(Production Example 2, Preparation of Composition for Low Refractive Index Layer)
50 parts by mass, 1,10-diaacryloyloxy-2,2,3,3,4,4,5,5,6 in terms of solid content of the organosol in which the modified hollow silica fine particles obtained in Production Example 1 were dispersed. , 6,7,7,8,8,9,9-hexadecafluorodecane (fluorine content 53 mass%) [manufactured by Kyoeisha Chemical Co., Ltd., trade name “16-FDA”] 50 parts by mass, photopolymerization started 5 parts by mass of an agent [manufactured by Ciba Specialty Chemicals Co., Ltd., Irgacure 907] and 2000 parts by mass of isopropyl alcohol were mixed to obtain a composition for a low refractive index layer (fluorine-containing curable coating liquid).
Example 1
Urethane acrylate [molecular weight 1400, viscosity at 60 ° C. 2500 to 4500 Pa · s, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., purple UV7600B] 100 parts by mass, 1- [4- (2-hydroxyethoxy) phenyl as a photopolymerization initiator ] 2-Hydroxy-2-methyl-1-propan-1-one [Ciba Specialty Chemicals, Irgacure 2959] 3 parts by mass and methyl isobutyl ketone (MIBK) 83.4 parts by mass To prepare a binder, and fine particles of a cross-linked acrylic-styrene copolymer resin (XX-09V, monodispersed fine particles having a uniform particle diameter, average particle size as a translucent organic fine particle, manufactured by Sekisui Plastics Co., Ltd.) Diameter (a) is 5.0 μm] 30 parts by mass was mixed to prepare a composition for forming an antiglare hard coat layer.

This anti-glare hard coat layer forming composition was applied on a triacetyl cellulose (TAC) film having a thickness of 80 μm as a transparent substrate by a roll coater so that the dry film thickness was 8.5 μm. For 2 minutes. The dry film thickness is substantially the film thickness (A) of the antiglare hard coat layer. Thereafter, ultraviolet rays were irradiated with a 120 W high-pressure mercury lamp (manufactured by Nippon Battery Co., Ltd.) (integrated light amount 400 mJ / cm ² ) and cured to produce an antiglare film. The cured product obtained by curing the binder had a refractive index of 1.500, and the translucent fine particles had a refractive index of 1.498. Therefore, the difference in refractive index between the cured binder and the translucent fine particles was 0.002. Further, the arithmetic average roughness (Ra) on the surface of the antiglare hard coat layer was 0.14 μm, the average interval (Sm) of irregularities was 150 μm, and the overall haze value of the antiglare film was 2.2%.
(Example 2)
After applying the composition for a low refractive index layer produced in Production Example 2 on the antiglare hard coat layer in Example 1 so that the dry thickness is 0.1 μm, ultraviolet irradiation is performed in a nitrogen atmosphere. A low refractive index layer was formed by irradiating an ultraviolet ray of 400 mJ using an apparatus (manufactured by Eye Graphics Co., Ltd., 120 W high pressure mercury lamp) to cure the composition for low refractive index layer. The refractive index of this low refractive index layer was 1.3. The arithmetic average roughness (Ra) on the surface of the antiglare hard coat layer was 0.15 μm, the average interval (Sm) of irregularities was 150 μm, and the overall haze value of the antiglare film was 1.9%.
(Example 3)
The film thickness (A) of the antiglare hard coat layer is 5.0 μm, and cross-linked acrylic resin fine particles are used as translucent organic fine particles (average particle size (a) is 5.0 μm, manufactured by Soken Chemical Co., Ltd., MX-500). An antiglare film was prepared in the same manner as in Example 2 except that was used. After applying the composition for a low refractive index layer produced in Production Example 2 so that the thickness when dried is 0.1 μm, an ultraviolet irradiation device (made by Eye Graphics, 120W high-pressure mercury lamp) under a nitrogen atmosphere The composition for low refractive index layer was cured by irradiating with 400 mJ of ultraviolet rays using to form a low refractive index layer. The refractive index of the crosslinked acrylic resin fine particles was 1.490, and the difference in refractive index from the refractive index of the cured binder was 0.01. The arithmetic average roughness (Ra) on the surface of the antiglare hard coat layer was 0.20 μm, the average interval (Sm) of unevenness was 200 μm, and the overall haze value of the antiglare film was 1.9%.
Example 4
The film thickness (A) of the antiglare hard coat layer is 5.0 μm, and cross-linked acrylic resin fine particles are used as translucent organic fine particles (average particle size (a) is 5.0 μm, manufactured by Soken Chemical Co., Ltd., MX-500). And an antiglare hard coat layer was formed in the same manner as in Example 3 except that the amount added was 20 parts by weight. On the antiglare hard coat layer, the composition for a low refractive index layer produced in Production Example 2 was applied so that the thickness upon drying was 0.1 μm, and then an ultraviolet irradiation device ( A low refractive index layer was formed by irradiating 400 mJ ultraviolet rays using a 120 W high pressure mercury lamp manufactured by Eye Graphics Co., Ltd., and curing the composition for low refractive index layer. The refractive index of the crosslinked acrylic resin fine particles was 1.490, and the difference in refractive index from the refractive index of the cured binder was 0.01. The arithmetic average roughness (Ra) on the surface of the antiglare hard coat layer was 0.20 μm, the average interval (Sm) of irregularities was 250 μm, and the overall haze value of the antiglare film was 1.7%.
(Example 5)
The active energy ray-curable resin of the composition for forming an antiglare hard coat layer is dipentaerythritol hexaacrylate, the photopolymerization initiator is 1-hydroxycyclohexyl phenyl ketone [manufactured by Ciba Specialty Chemicals, Inc., Irgacure (Irg. ) 184], an antiglare hard coat layer was formed in the same manner as in Example 1. On the antiglare hard coat layer, the composition for a low refractive index layer produced in Production Example 2 was applied so that the thickness upon drying was 0.1 μm, and then an ultraviolet irradiation device ( The low refractive index layer was formed by irradiating 400 mJ ultraviolet rays using a 120W high pressure mercury lamp manufactured by Eye Graphics Co., Ltd. to cure the low refractive index layer composition. The refractive index of the cured binder was 1.503, and the refractive index difference from the translucent translucent organic fine particles was 0.005. The arithmetic average roughness (Ra) on the surface of the antiglare hard coat layer was 0.18 μm, the average interval (Sm) of irregularities was 200 μm, and the overall haze value of the antiglare film was 3.1%.
(Example 6)
An antiglare hard coat layer was formed by the same operation as in Example 5 except that the film thickness (A) of the antiglare hard coat layer was 10.0 μm. On the antiglare hard coat layer, the composition for a low refractive index layer produced in Production Example 2 was applied so that the thickness upon drying was 0.1 μm, and then an ultraviolet irradiation device ( A low refractive index layer was formed by irradiating 400 mJ ultraviolet rays using a 120 W high pressure mercury lamp manufactured by Eye Graphics Co., Ltd., and curing the composition for low refractive index layer. The refractive index of the cured binder was 1.503, and the difference in refractive index from the translucent organic fine particles was 0.005. The arithmetic average roughness (Ra) on the surface of the antiglare hard coat layer was 0.08 μm, the average interval (Sm) of irregularities was 110 μm, and the overall haze value of the antiglare film was 2.5%.
(Comparative Example 1)
100 parts by mass of urethane acrylate [manufactured by Nippon Synthetic Chemical Industry Co., Ltd., purple light UV7600B], 1- [4- (2-hydroxyethoxy) phenyl] -2-hydroxy-2-methyl-1-propane- as a photopolymerization initiator A binder was prepared by mixing 3 parts by weight of 1-one [Ciba Specialty Chemicals Co., Ltd., Irgacure 2959] and 130 parts by weight of methyl isobutyl ketone (MIBK). 30 parts by mass of fine particles of silica particles (Fuji Silysia Chemical Co., Ltd., Pyrospher C-1504, average particle size: 4.0 μm) were mixed to prepare a composition for forming an antiglare hard coat layer.

This anti-glare hard coat layer forming composition was applied on a 80 μm thick triacetyl cellulose (TAC) film as a transparent substrate with a roll coater so as to have a dry film thickness of 5.0 μm, and 80 ° C. For 2 minutes. Thereafter, ultraviolet rays were irradiated with a 120 W high-pressure mercury lamp (manufactured by Nippon Battery Co., Ltd.) (integrated light amount 400 mJ / cm ² ) and cured to produce an antiglare film. The refractive index of the cured product obtained by curing the binder was 1.500, and the refractive index of the translucent fine particles was 1.410. Therefore, the difference in refractive index between the cured binder and the light-transmitting fine particles was 0.090. The arithmetic average roughness (Ra) on the surface of the antiglare hard coat layer was 0.20 μm, the average interval (Sm) of irregularities was 200 μm, and the overall haze value of the antiglare film was 30.0%.

  About the anti-glare films obtained in the above Examples 1 to 6 and Comparative Example 1, the surface roughness, haze value, image sharpness value, glare, black density and visibility reflectance are measured, and those The results are shown in Table 1.

表１に示した結果より、実施例１〜６ではバインダーの硬化物と透光性有機微粒子との屈折率差、防眩性ハードコート層表面におけるＲａ及びＳｍ、さらには全体ヘイズ値及び全体ヘイズ値に対する内部ヘイズ値の割合を本発明の範囲に設定した。その結果、防眩性フィルムを高精細液晶ディスプレイの画像表示側の最表面に配置したとき、ぎらつきを抑制することができ、画像の黒濃度を保持することができ、像鮮明度の値を５２％以上で、６０°反射で測定される像鮮明度の値を５０％以下にすることができ、かつ視感度反射率を３％以下にすることができた。

From the results shown in Table 1, in Examples 1 to 6, the refractive index difference between the cured binder and the light-transmitting organic fine particles, Ra and Sm on the surface of the antiglare hard coat layer, and the overall haze value and the overall haze. The ratio of the internal haze value to the value was set in the range of the present invention. As a result, when the antiglare film is disposed on the outermost surface on the image display side of the high-definition liquid crystal display, glare can be suppressed, the black density of the image can be maintained, and the image sharpness value can be set. At 52% or more, the image sharpness value measured by 60 ° reflection could be 50% or less, and the visibility reflectance could be 3% or less.

  On the other hand, in Comparative Example 1, inorganic fine particles were used as the light-transmitting fine particles, the refractive index difference with the binder cured product exceeded 0.05, the Ra on the antiglare hard coat layer surface exceeded 0.3, and the overall haze The value was set so that it exceeded 10% and the ratio of the internal haze value was less than 50%. For this reason, the glare cannot be suppressed, the evaluation of the black density is poor, and the image sharpness value is 20%.

In addition, this embodiment can also be changed and embodied as follows.
-In order to adjust the refractive index difference between the refractive index of the binder cured product and the refractive index of the light-transmitting organic fine particles, the composition of the active energy ray-curable resin constituting the binder can be changed. For example, a plurality of types of active energy ray-curable resins can be used in appropriate combination.

The light-transmitting organic fine particles can be configured to enhance antiglare properties in consideration of physical properties such as particle size distribution and specific gravity.
-A silane coupling agent etc. can be mix | blended in the said composition for anti-glare hard-coat layer formation, and it can also comprise so that the adhesiveness of the anti-glare hard-coat layer with respect to a transparent base material may be improved.

  -As said active energy ray hardening-type resin, the monomer which has functional groups, such as a carboxyl group and an amino group, can be comprised so that the adhesiveness of the glare-proof hard coat layer with respect to a transparent substrate may be improved.

Furthermore, the technical idea grasped from the embodiment will be described below.
The anti-glare property for a liquid crystal display according to any one of claims 2 to 4, wherein the translucent organic fine particles are formed of a styrene-acrylic copolymer resin or a cross-linked product thereof. the film. In this case, in addition to the effect of the invention according to any one of claims 2 to 4, the refractive index of the light-transmitting organic fine particles is easily adjusted by the copolymer composition of styrene and an acrylic monomer. be able to.

  The ratio (Sm / Ra) of the average interval (Sm) of the unevenness to the arithmetic average roughness (Ra) on the surface of the antiglare hard coat layer is 1000 to 1400. 5. The antiglare film for liquid crystal display according to any one of 4 above. When constituted in this way, in addition to the effect of the invention according to any one of claims 1 to 4, the light can be sufficiently diffused, the antiglare property is improved, and the glare is suppressed. be able to.

  The anti-glare film for a liquid crystal display according to any one of claims 1 to 4, wherein the binder contains a diluting solvent. When comprised in this way, in addition to the effect of the invention which concerns on any one of Claims 1-4, the viscosity of a binder can be adjusted and the applicability | paintability on a transparent base material can be improved. .

Claims (5)

Antiglare hard comprising a cured product of an antiglare hard coat layer forming composition containing an active energy ray-curable resin, a photopolymerization initiator, and translucent organic fine particles on a transparent substrate made of a cellulose-based material An antiglare film having a coating layer formed thereon,
The refractive index difference between the cured product of the binder containing the active energy ray-curable resin and the photopolymerization initiator and the translucent organic fine particles is adjusted to 0 to 0.05, and JIS on the surface of the antiglare hard coat layer is adjusted. The arithmetic average roughness (Ra) measured in accordance with B 0601-1994 is 0.01 to 0.30 μm, the average interval of unevenness (Sm) is 10 to 300 μm, and the overall haze value is 10% or less. And an anti-glare film for liquid crystal displays, wherein the ratio of the internal haze value to the total haze value is 50% or more. 2. The antiglare film for a liquid crystal display according to claim 1, wherein the translucent organic fine particles are formed of a (meth) acrylic resin, a styrene-acrylic copolymer resin, or a cross-linked product thereof. The ratio a / A of the average particle diameter (a) of the translucent organic fine particles to the film thickness (A) of the antiglare hard coat layer is 0.3 to 1.5. The anti-glare film for liquid crystal displays as described. The low-refractive index layer having a refractive index lower than the refractive index of the anti-glare hard coat layer is provided on the anti-glare hard coat layer. The anti-glare film for liquid crystal displays as described in the item. A liquid crystal display comprising the antiglare film for a liquid crystal display according to claim 1 on the outermost surface on the image display side.