JP6825198B2 - Anti-glare optical laminate and image display device - Google Patents

Description

The present invention relates to an antiglare optical laminate and an image display device.

Conventionally, in an image display device such as a liquid crystal display (LCD), an organic electroluminescence display (ELD), or a field emission display (FED), observation is performed by reflecting external light or reflecting an image on the image display surface. An antiglare layer is used for the purpose of preventing a decrease in visibility from the human side. For such an antiglare layer, for example, as described in Patent Documents 1 and 2, a resin composition containing translucent fine particles (beads) is coated on a base film, and a surface based on the translucent fine particles is applied. It is realized by forming a resin layer having an uneven shape.

JP-A-2010-79099 International Publication Patent 08/200587 Pamphlet

However, in Patent Documents 1 and 2, although an excellent antiglare function is obtained for increasing the panel resolution, for example, as described in Examples of Patent Document 2, an optical laminate The reflectance Y value in the visible wavelength range of the surface was 0.9 to 2.4%, and the reflectance was not sufficiently low.
Under these circumstances, the present inventors have provided an antireflection layer having a two-layer structure of a high reflectance layer / a low reflectance layer on the surface of the antiglare layer, for example, from the viewpoint of suppressing manufacturing costs, and further have low reflectance. As a result of examining the modified optical laminate, when the lowest reflectance region in the visible wavelength range is set to a wavelength region with high visual sensitivity (for example, around 550 nm) as in the conventional case, the absolute value of the reflectance in the wavelength region is set. In addition to being able to reduce the reflectance, it is possible to reduce the reflectance over a wider range in the visible wavelength range, but the uneven shape of the antiglare layer and the thickness dependence of the antireflection layer derived from the distribution become remarkable, and the visible wavelength We have found a new problem that the minimum reflectance position in the range shifts due to a slight difference in thickness of the antireflection layer, and at the same time, the shape of the spectrum changes, so that the color tone related to the display surface tends to be uncomfortable. ..
The above problem is that when a high refractive index layer / low refractive index layer is provided on the antiglare layer having irregularities by wet coating, the covering state at the peaks and valleys of the irregularities differs due to the flow of the coating liquid. It is inferred that this is one reason.

Furthermore, in recent years, displays as image display devices have shifted from analog broadcasting to BS and terrestrial digital broadcasting, and are capable of displaying higher-definition images, so-called 4K2K (screen: width 4,000 x height 2,000). With the development or commercialization of ultra-high-definition liquid crystal displays with resolutions higher than or equal to (general term for images corresponding to the previous and next resolutions), the display will become even higher quality, and the resolution will also increase due to the powerful enlargement of the screen. Since the screen does not decrease, the screen is made larger. However, the larger the screen, the larger the emission angle of light from both ends of the screen. Therefore, the uniformity of color in a range in which the emission angles of the optical laminate and the like are different (hereinafter, "color uniformity"). ) Is beginning to be emphasized. In addition, in an ultra-high-definition display, the resolution of the observer's eyes does not exceed the resolution of the display even when approaching the screen, so the screen may be viewed from a short distance. In that case, the viewing angle to both ends of the screen. Becomes larger. From these facts, for example, an image of a TV or the like becomes very visually annoying, including the occurrence of a sense of discomfort due to the above-mentioned color tone derived from the antiglare layer, depending on the observation position. From this point of view as well, there is a possibility that a sense of discomfort related to the color tone will occur and a decrease in color uniformity due to the observation position will become a big problem in the future.
Based on the above, at present, when the panel resolution of an image display device with a large screen is increased and the reflectance of the display screen is reduced, an antiglare function is provided and the color is uncomfortable. There is a strong demand for the development of an antiglare optical laminate with less reduction in color uniformity.

In view of the above problems, it is an object of the present invention to provide an antiglare optical laminate having an antiglare function, low reflection, less discomfort in color, and less decrease in color uniformity.

In order to solve the above problems, the present invention provides the following optical laminates [1] to [7] and an image display device.
[1] An antiglare optical laminate including an antiglare layer and an antireflection layer in this order from the transparent base material side, and the surface of the antiglare layer has an uneven shape. The average visual reflectance Y value on the outermost surface of the antireflection layer is 0.4 to 0.6%, the reflectance at a wavelength of 430 nm is 0.4 to 0.7%, and the reflectance at a wavelength of 630 nm is 0.7. An antiglare optical laminate having a reflectance of ~ 1.0%, further monotonically decreasing toward the long wavelength side at a wavelength of 430 nm or less, and monotonically increasing toward the long wavelength side at a wavelength of 550 nm or more.
[2] When the rate of change of the reflectance of the reflectance curve in the visible wavelength range at a wavelength of 395 nm to 405 nm is m (400) and the rate of change of the reflectance at a wavelength of 625 nm to 635 nm is m (630), m (400). , M (630) satisfy −0.019 ≦ m (400) <−0.005, 0.005 ≦ m (630) <0.0085, respectively, the antiglare property according to the above [1]. Optical laminate.
[3] The ratio (Y / Z) of the average visual reflectance Y value (%) to the minimum reflectance Z (%) of the reflectance curve in the visible wavelength range is 1.20 ≦ Y / Z ≦ 1. The antiglare optical laminate according to the above [1] or [2], which is 50.
[4] The antiglare optical laminate according to any one of [1] to [3] above, wherein the total haze value of the antiglare optical laminate is 0.1 to 60%.
[5] The average spacing of irregularities defined by JIS-B0601-1994 on the surface of the antiglare layer is Sm (μm), the average inclination angle is θa (degrees), the arithmetic average roughness is Ra (μm), and 10-point average. The antiglare property according to any one of the above [1] to [4], wherein Sm, θa, Ra and Rz satisfy the following (a) to (d) when the roughness is Rz (μm). Optical laminate.
(A) 30 μm ≤ Sm ≤ 500 μm
(B) 0.05 degrees ≤ θa ≤ 5 degrees (c) 0.08 μm ≤ Ra ≤ 0.50 μm
(D) 0.2 μm ≤ Rz ≤ 2.0 μm
[6] Hue of specularly reflected light (CIE1976L ^* a ^* b) with respect to 5 degree incident light of CIE standard light source D65 in the wavelength range λ (380 ≦ λ ≦ 780 nm) on the surface of the low refractive index layer of the antireflection layer. ^* color space ^L * ^a * ^{b *} reflection color in the chromaticity ^system) a *, ^{b *} is, 3.50 ≦ ^{a *} ≦ 6.00, is -1.40 ≦ ^{b *} ≦ 3.00, the The antiglare optical laminate according to any one of [1] to [5].
[7] An image display device in which an antiglare optical laminate is arranged on the front surface of a display, and the antiglare optical laminate includes an antiglare layer and an antireflection layer in this order from the transparent substrate side. The average visual reflectance Y value (%) on the outermost surface of the antireflection layer is 0.40 to 0.60%, and the reflectance at a wavelength of 430 nm is 0.4 to 0.7%. The reflectance at a wavelength of 630 nm is 0.7 to 1.0%, and the reflectance in the visible wavelength range monotonically decreases toward the long wavelength side at a wavelength of 430 nm or less, and monotonically increases toward the long wavelength side at a wavelength of 550 nm or more. Image display device.

According to the present invention, it is possible to provide an antiglare optical laminate having an antiglare function, low reflection, less discomfort in color, and less decrease in color uniformity.

It is sectional drawing which shows an example of the antiglare optical laminate of this invention. This is an example of the spectral reflectance curves obtained in the examples and comparative examples of the present invention.

[Anti-glare optical laminate]
The antiglare optical laminate of the present invention is an antiglare optical laminate including an antiglare layer and an antireflection layer in this order from the transparent substrate side, and the surface of the antiglare layer is It has an uneven shape, and the average visual reflectance Y value on the outermost surface of the antireflection layer is 0.4 to 0.6%, the reflectance at a wavelength of 430 nm is 0.4 to 0.7%, and the wavelength. The reflectance at 630 nm is 0.7 to 1.0%, and the reflectance in the visible wavelength range monotonically decreases toward the long wavelength side at a wavelength of 430 nm or less, and monotonically increases toward the long wavelength side at a wavelength of 550 nm or more. It is a dazzling optical laminate.

FIG. 1 is a cross-sectional view showing an example of the antiglare optical laminate of the present invention. In the antiglare optical laminate 1, the antiglare layer 3, the high refractive index layer 5 and the low refractive index layer 6 are laminated in this order on the transparent base material 2, and 4 indicates translucent particles. .. Further, FIG. 2 is an example of the spectral reflectance curves obtained in the examples and comparative examples of the present invention.

The average visual reflectance Y value (visible wavelength range: 380 to 780 nm) on the outermost surface of the antireflection layer used in the present invention is 0.4 to 0.6%, preferably 0.4 to 0.55. %, More preferably 0.4 to 0.5%. If the average visual reflectance Y value is less than 0.4%, there is a possibility that a sense of discomfort with respect to the tint of the reflected light may increase. Further, if it exceeds 0.6%, a sufficient antireflection function cannot be obtained. If the average visual reflectance Y value is within the above range, it has a sufficient antireflection function and is less likely to cause a sense of discomfort with respect to the tint of the reflected light.

The reflectance at a wavelength of 430 nm on the outermost surface of the antireflection layer is 0.4 to 0.7%, preferably 0.4 to 0.6%, and more preferably 0.4 to 0.5%. Is. If the reflectance is less than 0.4%, a sense of discomfort in color (a strong redness is felt) may occur due to the balance with the reflectance curve on the long wavelength side of the visible wavelength range, which will be described later. If the reflectance exceeds 0.7%, tint is likely to occur and a sufficient antireflection function cannot be obtained. If the reflectance is within the above range, it has a sufficient antireflection function, and there is no discomfort in color due to the balance with the reflectance curve on the long wavelength side of the visible wavelength range described later.

The reflectance at a wavelength of 630 nm is 0.7 to 1.0%, preferably 0.7 to 0.9%, and more preferably 0.7 to 0.8%. If the reflectance is less than 0.7%, a sense of discomfort in color (a strong bluish sensation) may occur due to the balance with the reflectance curve on the short wavelength side of the visible wavelength range described above. If the reflectance exceeds 1.0%, color tint is likely to be generated, and a sufficient antireflection function cannot be obtained. If the reflectance is within the above range, it has a sufficient antireflection function, and there is no discomfort in color due to the balance with the reflectance curve on the short wavelength side of the visible wavelength range described above.

The reflectance in the wavelength range of 430 to 550 nm changes substantially flat toward the long wavelength side, and there is no inflection point. The reflectance is preferably 0.3 to 0.5%, more preferably 0.3 to 0.4%. In order to make all the reflectances less than 0.3% in this wavelength range, it is necessary to further increase the number of antireflection layers, which is not preferable because it leads to an increase in tact time and a cost increase such as material cost in manufacturing. If the reflectance exceeds 0.5%, the antireflection function may be inferior. If the reflectance is in this range, the reflectance can be reduced without increasing the cost, and even though the wavelength range with high luminosity factor is included, the color of the reflected light feels strange (strongly greenish). ) Does not occur.

The reflectance in the visible wavelength range monotonically decreases at a wavelength of 430 nm or less without having an inflection point on the long wavelength side. The reflectance at a wavelength of 430 nm or less is 0.3 to 1.2%, and decreases with a gentle slope toward the long wavelength side.
When the rate of change in reflectance of the reflectance curve in the visible wavelength range at wavelengths of 395 nm to 405 nm is m (400) (% / nm), m (400) is −0.019 ≦ m (400) <-0. .005 is preferable, more preferably −0.016 ≦ m (400) <−0.007, and even more preferably −0.015 ≦ m (400) <−0.0095. When m (400) is in the above range, bluish color is not added, so that the color is not mixed with yellowish color and no discomfort is generated. Moreover, only redness is not emphasized.
The rate of change m (400) of the reflectance at a wavelength of 395 nm to 405 nm is in the above range, and the rate of change m (630) of the reflectance at a wavelength of 625 nm to 635 nm of the reflectance curve at a wavelength of 550 nm or more, which will be described later, is specified. By setting the range, it is possible to reduce the discomfort with respect to the color.
The rate of change m (400) of the reflectance at a wavelength of 395 nm to 405 nm is as follows from the reflectance R (395) corresponding to the wavelength 395 nm and the reflectance R (405) corresponding to the wavelength 405 nm on the reflectance curve. It was calculated from the formula of.

The reflectance in the visible wavelength range increases monotonically at a wavelength of 550 nm or more without having an inflection point on the long wavelength side. The reflectance at a wavelength of 550 nm or more is 0.3 to 2.7%, and increases with a steep slope toward the long wavelength side.
When the rate of change in reflectance of the reflectance curve in the visible wavelength range at wavelengths of 625 nm to 635 nm is m (630) (% / nm), m (630) is 0.005 ≦ m (630) <0.0085. Is more preferable, 0.006 ≦ m (630) <0.075, and even more preferably 0.0065 ≦ m (630) <0.070. When m (630) is in the above range, only redness is not emphasized and bluishness is not included.
The rate of change m (630) of the reflectance at a wavelength of 625 nm to 635 nm is in the above range, and the change rate m (400) of the reflectance at a wavelength of 395 nm to 405 nm is set to the above-mentioned specific range. It is possible to reduce the sense of discomfort.
The rate of change m (630) of the reflectance at a wavelength of 625 nm to 635 nm is the reflectance R (625) corresponding to the wavelength 625 nm and the reflectance R (635) corresponding to the wavelength 635 nm on the reflectance curve, as described above. ), Calculated from the following formula.

The ratio (Y / Z) of the average visual reflectance Y value (%) to the minimum reflectance Z (%) of the reflectance curve in the visible wavelength range is preferably 1.20 ≦ Y / Z ≦ 1. It is 50, and more preferably 1.30 ≦ Y / Z ≦ 1.40. When Y / Z is within the above range, the reflectance Y value (%) becomes small, and even when the amount of reflected light decreases, there is no awareness of discomfort in color.

Hue of specularly reflected light (CIE1976L ^* a ^* b ^* color space) with respect to 5 degree incident light of CIE standard light source D65 in the wavelength range λ (380 ≦ λ ≦ 780 nm) on the surface of the low refractive index layer of the antireflection layer. L ^* a ^* b ^* Reflected hue in the chromaticity system) a ^* , b ^* are preferably 3.50 ≤ a ^* ≤ 6.00 and -1.40 ≤ b ^* ≤ 3.00. Preferably, 3.80 ≦ a ^* ≦ 5.25 and -1.20 ≦ b ^* ≦ 1.10, and more preferably 4.00 ≦ a ^* ≦ 5.00 and −1.0 ≦. b ^* ≤ 1.0. When the reflected hues a ^* and b ^* are in the above range, it can be ensured that the optical laminate has little discomfort in color. Normally, when the reflected hue a ^* is a positive value, it becomes a red region, and when the reflected hue b ^* shifts from a negative to a positive value, it shifts from a blue region to a yellow region.

<Transparent base material>
The transparent base material used in the present invention is not particularly limited as long as it is a transparent material generally used for antireflection films and the like, but from the viewpoint of material cost, productivity and the like, a plastic film, a plastic sheet or the like is preferably used. It can be appropriately selected according to the application.

Examples of the plastic film or plastic sheet include those made of various synthetic resins. Examples of the synthetic resin include cellulose resins such as triacetyl cellulose resin (TAC), diacetyl cellulose, acetate butyrate cellulose, and cellophane; polyethylene terephthalate resin (PET), polybutylene terephthalate resin, polyethylene naphthalate-isophthalate copolymer resin, and polyester. Polyester resin such as based thermoplastic elastomer; low density polyethylene resin (including linear low density polyethylene resin), medium density polyethylene resin, high density polyethylene resin, ethylene α-olefin copolymer, polypropylene resin, polymethylpentene resin, polybutene Polyolefin resins such as resins, ethylene-propylene copolymers, propylene-butene copolymers, olefin-based thermoplastic elastomers, or mixtures thereof; poly (meth) methyl acrylate resin, poly (meth) ethyl acrylate resin, poly Acrylic resins such as (meth) butyl acrylate resin; polyamide resins typified by nylon 6 or nylon 66; polystyrene resins; polycarbonate resins; polyarylate resins; or polyimide resins are preferable.

As the transparent base material, one of the above-mentioned plastic films and plastic sheets can be used alone, or two or more kinds can be selected and used as a mixture. However, from the viewpoint of flexibility, toughness, transparency, etc., a cellulose resin is used. Polyester resin is more preferable, and triacetyl cellulose resin (TAC) and polyethylene terephthalate resin are more preferable.
The thickness of the transparent base material is not particularly limited, but is appropriately selected depending on the intended use, but is usually 25 to 200 μm, and is preferably 40 to 80 μm in consideration of durability and handleability in the manufacturing process.

<Anti-glare layer>
The antiglare optical laminate of the present invention has an antiglare layer having an uneven shape on a transparent base material for the purpose of preventing deterioration of visibility due to reflection of external light and reflection of an image.

The average spacing Sm (μm) of the unevenness defined by JIS-B0601-1994 on the surface of the antiglare layer is preferably 30 μm ≦ Sm ≦ 500 μm, more preferably 50 μm ≦ Sm ≦ 450 μm, and further preferably 70 μm ≦ Sm ≦ 400 μm. Is. When Sm is in the above range, the antireflection layer has good followability to the surface of the antiglare layer.
The average inclination angle θa (degree) is preferably 0.05 degrees ≦ θa ≦ 5 degrees, more preferably 0.7 degrees ≦ θa ≦ 4 degrees, and further preferably 0.9 degrees ≦ θa ≦ 3 degrees. When θa is in the above range, the antireflection layer has good followability to the surface of the antiglare layer.

The arithmetic average roughness Ra (μm) is preferably 0.08 μm ≦ Ra ≦ 0.50 μm, more preferably 0.15 μm ≦ Ra ≦ 0.35 μm, and further preferably 0.20 μm ≦ Ra ≦ 0.30 μm. is there. When Ra is in the above range, it functions as an antiglare layer, and the antireflection layer has good followability to the surface of the antiglare layer.
The 10-point average roughness Rz (μm) is preferably 0.2 μm ≦ Rz ≦ 2.0 μm, more preferably 0.7 μm ≦ Rz ≦ 1.8 μm, and further preferably 0.9 μm ≦ Rz ≦ 1.6 μm. .. When Rz is in the above range, it functions as an antiglare layer, and the antireflection layer has good followability to the surface of the antiglare layer.

The total haze value of the antiglare optical laminate is preferably 0.1 to 60%, more preferably 0.1 to 50%, and even more preferably 0.1 to 40%. .. Anti-glare can be imparted by setting the total haze to 0.1% or more. Further, by setting the haze to 60% or less, it is possible to prevent a decrease in the resolution of the display element and to easily prevent a decrease in the contrast.

The thickness of the antiglare layer is preferably 0.5 to 30 μm, more preferably 2 to 9 μm, and even more preferably 3 to 6 μm. When the thickness is within the above range, it is possible to suppress a decrease in visibility due to reflection of external light or reflection of an image.
In the case where the antiglare layer is one layer or two layers from the interface of the transparent base material of the antiglare optical laminate of the present invention to the outermost surface of the laminate (in the case of two layers, the uneven portion of the antiglare layer). A surface adjustment layer may be used), and other optical functional layers such as a low refractive index layer and a high refractive index layer, which will be described later, are laminated to form a multi-layer structure.
The surface adjusting layer used in the present invention exhibits an antiglare function integrally with the antiglare layer. Therefore, when the surface adjusting layer is formed, the values of the uneven shape of the surface such as Sm, θa, and RzRa are within the scope of the present invention.

The refractive index of the antiglare layer is smaller than that of the high refractive index layer described later, preferably in the range of 1.45 to 1.70, and more preferably in the range of 1.45 to 1.60. is there. If the refractive index of the antiglare layer is in such a range, there is no difficulty in controlling the refractive index of the high refractive index layer.

The method for forming the antiglare layer is not particularly limited, but usually, an antiglare layer having an uneven shape is formed on a transparent base material by using a composition for an antiglare layer in which fine particles are added to a resin (A). Method, (B) a method of forming an antiglare layer having an uneven shape using a composition for an antiglare layer containing only a resin or the like without adding fine particles, and (C) an antiglare using a process of imparting an uneven shape. Examples thereof include a method of forming a layer.

(A) When a composition for an antiglare layer in which fine particles are added to a resin is used The antiglare layer used in the present invention is formed on a transparent substrate by using a composition for an antiglare layer in which fine particles are added to a resin. May be good. Examples of the fine particles used in the antiglare layer composition include spherical particles, for example, spherical particles, elliptical particles, and the like, and preferably spherical particles. The average particle diameter R (μm) of the fine particles is 1.0 to 20 μm or less, preferably 3.5 to 15 μm.

80% or more, preferably 90% or more of the fine particles have an average particle size distribution of the fine particles in the range of R ± 1.0 μm, more preferably R ± 0.5 μm. When the average particle size distribution of the fine particles is within the above range, the uniformity of the uneven shape of the antiglare optical laminate can be improved, and the surface glare phenomenon (lens effect derived from the fine particles) can be effectively prevented.

Further, it is preferable to use agglomerated fine particles among the fine particles. The agglomerated fine particles are composed of the same fine particles or second fine particles having different average particle sizes, and preferably include the first fine particles and the second fine particles having different average particle sizes.
Examples of the fine particles (second fine particles) include inorganic and organic particles, and those formed of an organic material are preferable. The fine particles are preferably transparent, and examples thereof include plastic beads. Specific examples of plastic beads include styrene beads (refractive index 1.59), melamine beads (refractive index 1.57), acrylic beads (refractive index 1.49), acrylic-styrene beads (refractive index 1.54), and the like. However, plastic beads having a hydrophobic group on the bead surface are preferably used.

The antiglare layer can be formed of a curable resin. The curable resin is preferably transparent, and is a resin that is cured by ultraviolet rays or electron beams, that is, an ionizing radiation curable resin, a mixture of an ionizing radiation curable resin and a solvent-drying resin, or a thermosetting resin. There are various types, but preferably an ionizing radiation curable resin.

The ionizing radiation curable resin is a resin having a property of being cured by irradiating with ionizing radiation. Here, the ionizing radiation has an energy quantum capable of polymerizing or bridging molecules among electromagnetic waves or charged particle beams, and for example, ultraviolet rays (UV) or electron beams (EB) are used, and other X-rays are used. Examples thereof include electromagnetic waves such as rays and γ-rays, and charged particle beams such as α-rays and ion rays.

Examples of the ionizing radiation curable resin include those having an acrylate-based functional group, for example, a polyester resin having a relatively low molecular weight, a polyether resin, an acrylic resin, an epoxy resin, a urethane resin, an alkyd resin, a spiroacetal resin, a polybutadiene resin, and a polythiol. Examples thereof include oligomers or prepolymers such as (meth) alrilate of polyfunctional compounds such as polyene resins and polyhydric alcohols, and reactive diluents, and specific examples thereof include ethyl (meth) acrylate, ethylhexyl (meth) acrylate, and styrene. Monofunctional and polyfunctional monomers such as methylstyrene and N-vinylpyrrolidone, such as polymethylol propanetri (meth) acrylate, hexanediol (meth) acrylate, tripropylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate. , Pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate and the like.

When the ionizing radiation curable resin is used as the ultraviolet curable resin, it is preferable to use a photopolymerization initiator. Examples of the photopolymerization initiator include acetophenones, benzophenones, Michler benzoylbenzoates, α-amyloxime esters, tetramethylchulam monosulfide, and thioxanthones.

The solvent-drying type resin used by mixing with the ionizing radiation curable resin mainly includes a thermoplastic resin. As the thermoplastic resin, those generally exemplified are used. By adding the solvent-drying resin, it is possible to effectively prevent coating film defects on the coated surface.

Specific examples of the thermosetting resin include phenol resin, urea resin, diallyl phthalate resin, melanin resin, guanamine resin, unsaturated polyester resin, polyurethane resin, epoxy resin, aminoalkyd resin, melamine-urea cocondensation resin, and silicon resin. , Polysiloxane resin and the like.

It is preferable to add a leveling agent such as fluorine-based or silicone-based to the antiglare layer composition. By adding the leveling agent, it is possible to effectively prevent the coating film surface from being cured by oxygen during coating or drying.

The antiglare layer is made by using fine particles or aggregated fine particles and the above-mentioned resin as an appropriate solvent, for example, alcohols such as isopropyl alcohol, methanol and ethanol; ketones such as methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK) and cyclohexanone. Classes; esters such as methyl acetate, ethyl acetate, butyl acetate; halogenated hydrocarbons; aromatic hydrocarbons such as toluene and xylene; or a composition for an antiglare layer obtained by mixing with a mixture thereof as a transparent base material. It is formed by coating on.

The average particle size of the fine particles or the agglomerated fine particle particles can be calculated by the following operations (1) to (3).
(1) The optical sheet of the present invention is imaged as a transmission observation image with an optical microscope. The magnification is preferably 500 to 2000 times.
(2) Arbitrary 10 particles are extracted from the observation image, the major axis and minor axis of each particle are measured, and the particle size of each particle is calculated from the average of the major axis and minor axis. The major axis is the longest diameter on the screen of each particle. Further, the minor axis refers to the distance between two points where a line segment orthogonal to the midpoint of the line segment constituting the major axis is drawn and the orthogonal line segment intersects the particle.
(3) The same operation is performed 5 times on the observation image on another screen of the same sample, and the value obtained from the number average of the particle diameters for a total of 50 particles is taken as the average particle diameter of the particles.

Examples of the coating method of the antiglare layer composition include a roll coating method, a ear bar coating method, and a gravure coating method. After coating the antiglare layer composition, it is dried and UV cured. Examples of the ultraviolet source include light sources of ultra-high pressure mercury lamps, high pressure mercury lamps, low pressure mercury lamps, carbon arc lamps, black light fluorescent lamps, and metal halide lamp lamps. As the wavelength of ultraviolet rays, a wavelength range of 190 to 380 nm can be used. Examples of the electron beam source include various electron beam accelerators such as Cockcroft-Walt type, bandegraft type, resonant transformer type, insulated core transformer type, linear type, dynamistron type, and high frequency type. By curing the resin, the fine particles in the resin are fixed, and a predetermined uneven shape is formed on the outermost surface of the antiglare layer.

(B) When a composition for an antiglare layer containing only a resin or the like without adding fine particles is used In the antiglare layer used in the present invention, at least one polymer and at least one curable resin precursor are used as a predetermined solvent. The antiglare layer composition mixed with the above may be used and formed on a transparent substrate.

Examples of the polymer include a plurality of polymers that can be phase-separated by spinodal decomposition, for example, a cellulose derivative and a styrene resin, a (meth) acrylic resin, an alicyclic olefin resin, a polycarbonate resin, a polyester resin, or the like. The combination of. The curable resin precursor may be compatible with at least one of a plurality of polymers. Of the plurality of polymers, at least one polymer may have a functional group involved in the curing reaction of the curable resin precursor, for example, a polymerizable group such as a (meth) acryloyl group. As the polymer component, a thermoplastic resin is usually used.
The phase-separated structure generated by spinodal decomposition is finally cured by active light (ultraviolet rays, electron beams, etc.), heat, etc. to form a cured resin. Therefore, scratch resistance can be imparted to the antiglare layer, and durability can be improved.

The curable resin precursor is a compound having a functional group that reacts with heat or active energy rays (ultraviolet rays, electron beams, etc.), and is cured or crosslinked by heat or active energy rays or the like to form a resin (particularly cured or crosslinked). Various curable compounds capable of forming a resin) can be used. As the resin precursor, for example, a thermosetting compound or a resin [for example, an epoxy resin, an unsaturated polyester resin, or a low molecular weight compound having an epoxy group, a polymerizable group, an isocyanate group, an alkoxysilyl group, a silanol group, etc. , Urethane resin, silicone resin)], photocurable compounds curable by active light (ultraviolet rays, etc.) (for example, photocurable monomers, UV curable compounds of oligomers) and the like. The photocurable compound may be an EB (electron beam) curable compound or the like.

As a specific combination of the polymer and the curable resin precursor, at least two components of at least one polymer and at least one curable resin precursor are used in a combination in which they are phase-separated from each other near the processing temperature. To. Examples of the phase-separating combination include (i) a combination in which a plurality of polymers are incompatible with each other and phase-separated, and (ii) a combination in which the polymer and the curable resin precursor are incompatible with each other. iii) Examples thereof include a combination in which a plurality of curable resin precursors are incompatible with each other and phase-separated from each other. Of these combinations, (i) a combination of a plurality of polymers or (ii) a combination of a polymer and a curable resin precursor is usually preferable, and (i) a combination of a plurality of polymers is particularly preferable. When the compatibility between the two to be phase-separated is low, the two are effectively phase-separated in the drying process for evaporating the solvent, and the function as an antiglare layer is improved.

The solvent can be selected and used according to the type and solubility of the polymer and the curable resin precursor, and at least the solid content (plural polymers and curable resin precursor, reaction initiator, and other additives). Any solvent that can uniformly dissolve the above can be used in wet spinodal decomposition. Examples of such a solvent include ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.), ethers (dioxane, tetrahydrofuran, etc.), aliphatic hydrocarbons (hexane, etc.), and alicyclic hydrocarbons (hexane, etc.). Cyclohexane, etc.), aromatic hydrocarbons (toluene, xylene, etc.), carbon halides (di dichloromethane, dichloroethane, etc.), esters (methyl acetate, ethyl acetate, butyl acetate, etc.), water, alcohols (ethanol, isopropanol, etc.) Butanol, cyclohexanol, etc.), cellosolves (methylcellosolve, ethylcellosolve, etc.), cellosolve acetates, sulfoxides (dimethylsulfoxide, etc.), amides (dimethylformamide, dimethylacetamide, etc.), etc. can be exemplified. There may be.

For the antiglare layer, a composition for an antiglare layer in which at least one polymer and at least one curable resin precursor are mixed using an appropriate solvent is applied to a transparent base material, and then the solvent is evaporated. It can be obtained by going through a step of forming a phase-separated structure and a step of curing a curable resin precursor to form at least an antiglare layer by the accompanying spinodal decomposition.

(C) When an antiglare layer is formed by using a process for imparting an uneven shape The antiglare layer used in the present invention imparts an uneven shape to the surface of the antiglare layer after the antiglare layer is formed. The antiglare layer having an uneven shape may be formed by performing a shaping process. For example, an antiglare layer may be formed on the transparent base material, and an uneven shape may be formed on the surface of the antiglare layer. Further, it can be performed by a shaping process using a mold having an uneven shape opposite to that of the antiglare layer. Examples of the mold having the opposite uneven shape include an embossed plate and an embossed roller.

The uneven surface formed on the embossing roller or the flat plate-shaped embossing plate can be formed by a sandblast method, a bead shot method, or the like. The antiglare layer formed by using the embossed plate (embossed roller) by the sandblasting method has a shape in which a large number of concave shapes (on the other hand, a convex cross-sectional shape on the lower side) are distributed on the upper side thereof. The antiglare layer formed by using the embossed plate (embossed roller) by the bead shot method has a shape in which a large number of convex shapes (on the other hand, a convex cross-sectional shape on the upper side) are distributed on the upper side.

As the mold material for forming the concave-convex mold surface, metal, plastic, wood or a composite thereof can be used. As the preferred mold material of the present invention, chrome is preferable from the viewpoint of strength and wear resistance, and chrome is preferably plated on the surface of an iron embossed plate (embossing roller) from the viewpoint of economy and the like.

Examples of the particles (beads) to be sprayed when forming the concavo-convex mold by the sandblast method or the bead shot method include metal particles, silica, alumina, and inorganic particles such as glass. The particle size of these particles is preferably 100 to 300 μm. When spraying particles onto a mold material, a method of spraying these particles together with a high-speed gas can be mentioned.

<Anti-reflective layer>
The antiglare optical laminate of the present invention includes an antireflection layer on the antiglare layer. The layer structure of the antireflection layer is not particularly limited, but a two-layer structure composed of a low refractive index layer and a high refractive index layer is preferable from the viewpoint of ensuring characteristics (low reflectance) and manufacturing cost.

<High refractive index layer>
In the present invention, the high refractive index layer is laminated on the antiglare layer.
The high refractive index layer is usually (i) a resin composition for forming a high refractive index layer containing high refractive index particles such as zirconium oxide, diantimon pentoxide, antimony-doped tin oxide and a binder resin, and (ii) itself. It is formed of a single polymer having a high refractive index, (iii) a thin film of zirconium oxide, diantimonate pentoxide, etc. formed by a vapor deposition method such as a chemical vapor deposition method (CVD) or a physical vapor deposition method (PVD). In the present invention, the high refractive index layer is preferably a resin composition containing high refractive index particles and a binder resin (hereinafter, referred to as a resin composition for forming a high refractive index layer) from the viewpoint of manufacturing cost and scratch resistance. It may be formed by a cured product of).

Examples of high-refractive index particles (hereinafter, the numerical values in parentheses indicate the refractive index) include zinc oxide (ZnO; 1.90), titanium oxide (TiO ₂ ; 2.3 to 2.7), and cerium oxide (CeO). ₂ ; 1.95), indium tin oxide (ITO; 1.95), antimony-doped tin oxide (ATO; 1.80), yttrium oxide (Y ₂ O ₃ ; 1.87), zirconium oxide (ZrO ₂ ; 2) .0) and antimony pentoxide (Sb ₂ O ₅ ; 1.79) are preferably mentioned, and can be appropriately selected depending on the intended use.

The average particle size of the high refractive index particles is preferably 5 to 200 nm, more preferably 5 to 100 nm, and even more preferably 10 to 80 nm. When the average particle size of the fine particles is within the above range, the transparency of the high refractive index layer is not impaired, a good dispersed state of the fine particles can be obtained, and a desired refractive index can be obtained. Further, in the present invention, as long as the average particle size is within the above range, the fine particles may be formed in a chain.

Further, as the high refractive index particles, those having a surface treatment are preferably used. The surface treatment usually modifies the surface of the fine particles using a silane coupling agent. By applying the surface treatment to the fine particles, the affinity with the binder resin described later is improved and the dispersion of the fine particles is uniform. Therefore, agglomeration of fine particles is less likely to occur, so that the transparency of the high-refractive-index layer is lowered due to the increase in the size of the particles derived from the agglomeration, the coatability of the resin composition for forming the high-refractive-index layer, and the coating strength of the composition. Can be suppressed.

The binder resin is used from the viewpoint of film forming property and film strength, and a resin that can be immobilized by curing by heating or by irradiating ionizing radiation such as ultraviolet rays or electron beams is preferable. Examples of the binder resin contained in the resin composition for forming a high refractive index layer include those exemplified as the resin used for forming the antiglare layer described above, and examples thereof include melamine-based, urea-based, epoxy-based, and ketone-based resins. Thermosetting resins such as diallylphthalate-based, unsaturated polyester-based, and phenol-based resins, or ionizing and radiation-curable resins are preferable. Of these, an ionizing radiation curable resin is particularly preferable.

As the ionizing radiation curable resin, a polymerizable monomer and a polymerizable oligomer (or prepolymer) conventionally used as an ionizing radiation curable resin can be appropriately selected and used.
As the polymerizable monomer, a single amount of (meth) acrylate having a radically polymerizable unsaturated group in the molecule from the viewpoint of obtaining excellent scratch resistance, high refractive index, and excellent antireflection properties. The body is preferable, and the polyfunctional (meth) acrylate monomer is particularly preferable.
The polyfunctional (meth) acrylate monomer may be any (meth) acrylate monomer having two or more ethylenically unsaturated bonds in the molecule, and is not particularly limited. Specifically, ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, pentaerythritol di (meth) acrylate monostearate, dicyclopentanyl di (meth) acrylate, isocyanurate di (meth) acrylate and the like. Di (meth) acrylate; tri (meth) acrylate such as trimethylolpropantri (meth) acrylate, pentaerythritol tri (meth) acrylate, tris (acryloxyethyl) isocyanurate; dipentaerythritol tetra (meth) acrylate, di Pentaerythritol Penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate and other tetrafunctional (meth) acrylates; ethylene oxide-modified products, caprolactone-modified products, and propionic acid-modified products of the above-mentioned polyfunctional (meth) acrylate monomers. Etc. are preferably mentioned. Among these, trifunctional or higher functional (meth) acrylates are preferable from the viewpoint of obtaining excellent scratch resistance and a uniform high refractive index layer, and among them, dipentaerythritol penta (meth) acrylate and dipenta. Erythritol hexa (meth) acrylate is preferred. One of these polyfunctional (meth) acrylate monomers may be used alone, or two or more thereof may be used in combination.

In the present invention, the monofunctional (meth) acrylate monomer is appropriately used in combination with the above-mentioned polyfunctional (meth) acrylate monomer for the purpose of reducing the viscosity thereof, as long as the object of the present invention is not impaired. Can be done.

As the polymerizable oligomer, an oligomer having a radically polymerizable unsaturated group in the molecule, for example, an epoxy (meth) acrylate oligomer, can be obtained from the viewpoint of obtaining excellent scratch resistance, low polymerization shrinkage, imparting toughness, and the like. , Urethane (meth) acrylate oligomers, polyester (meth) acrylate oligomers, polyether (meth) acrylate oligomer oligomers and other (meth) acrylate oligomers, among which polyfunctional (meth) acrylate oligomers having 2 or more functional groups are preferable. Can be mentioned. Among these, urethane (meth) acrylate oligomer is preferable.
Here, the urethane (meth) acrylate oligomer can be obtained, for example, by esterifying a polyurethane oligomer obtained by reacting a polyether polyol or a polyester polyol with a polyisocyanate with (meth) acrylic acid.

The number of functional groups of the polymerizable oligomer is not particularly limited as long as it is 2 or more, but 2 to 8 is preferable from the viewpoint of obtaining excellent scratch resistance and high refractive index and excellent antireflection characteristics. , More preferably 2-6.
The number average molecular weight of the polymerizable oligomer (polystyrene-equivalent number average molecular weight measured by the GPC method) is preferably 1000 to 20000, and more preferably 1000 to 10000. When the above-mentioned polymerizable oligomer having a number average molecular weight is used, its viscosity is suppressed, so that the coating suitability is not impaired.

In the present invention, an ultraviolet curable resin or an electron beam curable resin can be preferably used as the ionizing radiation curable resin. When an electron beam curable resin is used, it can be cured without using a photopolymerization initiator, but in the case of an ultraviolet curable resin, it can be used in combination with a photopolymerization initiator described later.

When an ultraviolet curable resin is used as the ionizing radiation curable resin, it is preferable to add about 0.5 to 10 parts by mass of a photopolymerization initiator with respect to 100 parts by mass of the composition for forming a high refractive index layer. , 1 to 5 parts by mass is more preferable. The photopolymerization initiator can be appropriately selected from those conventionally used, and is not particularly limited, and examples thereof include photopolymerization initiators such as acetophenone-based, benzophenone-based, and benzoin-based. Any one of these can be used alone or in combination of both.

The resin composition for forming a high refractive index layer preferably contains a solvent for the purpose of improving the coatability of the resin composition. The solvent is not particularly limited, but for example, alcohols such as methanol, ethanol and isopropyl alcohol (IPA); ketones such as methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone; esters such as ethyl acetate and butyl acetate; halogenated carbides. Hydrogens; Aromatic hydrocarbons such as toluene and xylene; Glycol ethers such as propylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate and dipropylene glycol monoethyl ether, Alternatively, a mixture thereof is preferable. Among these, the coatability of the resin composition for forming a high refractive index layer is improved, and the evaporation rate of the solvent after coating of the composition is appropriate, so that uneven drying is unlikely to occur, and a uniform large-area coating film can be obtained. From the viewpoint of easy acquisition, ketones and glycol ethers are preferable.

The amount of the solvent can uniformly dissolve and disperse each component, improve the coatability of the resin composition for forming a high refractive index layer, and prevent the resin composition from agglomerating during storage after preparation. The concentration is adjusted appropriately so that the concentration is not too dilute at the time of application. The content of the solvent in the resin composition is preferably 50 to 99% by mass, preferably 60 to 97% by mass. The solvent used in the resin composition for forming a high refractive index layer does not exist in the high refractive index layer because it evaporates due to drying performed after the resin composition is applied.

Various additives are blended in the high refractive index layer according to the desired physical properties. Examples of the additive include a weather resistance improver, an abrasion resistance improver, a polymerization inhibitor, a cross-linking agent, an infrared absorber, an adhesive improver, an antioxidant, a leveling agent, a thixo property-imparting agent, and a coupling agent. Examples include plasticizers, antifoaming agents, fillers and the like. These additives may be added to the above resin composition for forming a high refractive index layer and used.

Examples of the high-refractive index particles used in the high-refractive index layer include the above-mentioned particles, and zirconia and antimony pentoxide are particularly preferable from the viewpoint of obtaining a high refractive index.

The high refractive index layer preferably has a thickness of 122 to 150 nm and a refractive index of 1.61 to 1.66 at a wavelength of 550 nm, more preferably a thickness of 127 to 145 nm, a refractive index of 1.62 to 1.65, and further. Preferably, the thickness is 130 to 140 nm and the refractive index is 1.63 to 1.64.

In the antireflection layer used in the present invention, since the lower antiglare layer has an uneven shape, the antireflection layer also has irregularities corresponding to those irregularities. Therefore, the thickness of the high refractive index layer of the antireflection layer used in the present invention ranges from the interface between the antiglare layer and the high refractive index layer to the interface between the high refractive index layer and the low refractive index layer (recessed with respect to the recess). Up to the convex part with respect to the convex part).

An example of a preferable forming method for forming the high refractive index layer is given below.
A composition for forming a high refractive index layer is prepared by uniformly mixing high refractive index particles, a binder resin, a solvent, various preferably used additives, and the like at a predetermined ratio. The composition for forming a high refractive index is preferably a liquid dissolved in a solvent in consideration of productivity. The viscosity of the liquid composition for forming a high refractive index layer is not particularly limited as long as it can form an uncured resin layer by the coating method described later. Mixing is performed using a disperser, for example, a roll mill such as a two-roll or three-roll mill, a ball mill, a ball mill such as a vibrating ball mill, a paint shaker, a continuous disc type bead mill, a bead mill such as a continuous annular type bead mill, or the like.

The composition for forming a high refractive index layer thus prepared is applied to the surface of the antiglare layer with a gravure coat, a bar coat, a roll coat, and a reverse roll so that the thickness after curing becomes a predetermined thickness. A known method such as coating or comma coating is applied, preferably with a gravure coating to form an uncured resin layer.
The uncured resin layer thus formed is dried for the purpose of evaporating a solvent or the like, and then heated or irradiated with ionizing radiation such as an electron beam or ultraviolet rays to cure the uncured resin layer. , Obtain a high refractive index layer.
For example, when the structure of the antiglare optical laminate is a transparent base material / antiglare layer / high refractive index layer / low refractive index layer, the curing here is usually the same for the antiglare layer. However, it is only semi-cured and fully cured when the low refractive index layer is cured.

When an electron beam is used as the ionizing radiation when curing the uncured resin layer, the acceleration voltage can be appropriately selected according to the resin to be used and the thickness of the layer, but usually, the acceleration voltage is about 70 to 300 kV. It is preferable to cure the uncured resin layer.
In the electron beam irradiation, the higher the acceleration voltage, the higher the penetrating ability. Therefore, when a base material deteriorated by the electron beam is used as the base material, the transmission depth of the electron beam and the thickness of the uncured resin layer By selecting the acceleration voltage so that is substantially equal to, the irradiation of the base material with extra electron beams can be suppressed, and the deterioration of the base material due to the excess electron beams can be minimized. it can.

The irradiation dose is preferably an amount at which the crosslink density of the binder resin is saturated, and is usually selected in the range of 5 to 300 kGy (0.5 to 30 Mrad), preferably 10 to 50 kGy (1 to 5 Mrad).
Further, the electron beam source is not particularly limited, and for example, various electron beams such as a cockloft Walton type, a bandegraft type, a resonance transformer type, an insulated core transformer type, or a linear type, a dynamitron type, and a high frequency type. An accelerator can be used.
When ultraviolet rays are used as ionizing radiation, those containing ultraviolet rays having a wavelength of 190 to 380 nm are emitted. The ultraviolet source is not particularly limited, and for example, a high-pressure mercury lamp, a low-pressure mercury lamp, a metal halide lamp, a carbon arc lamp, or the like is used.

The drying temperature condition for evaporating the solvent or the like contained in the composition for forming a high refractive index layer is preferably in the range of room temperature to 100 ° C., more preferably room temperature to 80 ° C., and the drying time is 10 to 120 seconds. Is preferable, and 30 to 90 seconds is more preferable. The room temperature is usually about 20 ° C.

<Low refractive index layer>
The low refractive index layer is laminated on the high refractive index layer described above for the purpose of obtaining a high antireflection effect.

The low refractive index layer is (i) a resin composition for forming a low refractive index layer containing low refractive index particles such as silica and magnesium fluoride and a binder resin, and (ii) a fluorine-containing polymer that itself has a low refractive index. A simple substance, (iii) a resin composition for low refractive index containing the low refractive index particles and a fluorine-containing polymer as a binder resin, (iv) formed by a vapor deposition method such as a chemical vapor deposition method (CVD) or a physical vapor deposition method (PVD). It is formed of a thin film such as silica or magnesium fluoride. In the present invention, from the viewpoint of easy formation of a low refractive index layer, excellent antireflection performance and scratch resistance, a resin composition for forming a low refractive index layer containing low refractive index particles and a binder resin is preferable. It is formed by an object.

The low refractive index particles are preferably used for the purpose of lowering the refractive index, that is, improving the antireflection property, and are used without limitation regardless of whether they are inorganic or organic such as silica and magnesium fluoride. However, from the viewpoint of further improving the antireflection property and ensuring good surface hardness, particles having a structure having voids themselves are preferably used.

Particles having a structure having voids themselves have fine voids inside, and are filled with a gas such as air having a refractive index of 1.0, so that the particles themselves have a low refractive index. It has become. Examples of the particles having such voids include inorganic or organic porous particles and hollow particles. For example, porous polymer particles using porous silica, hollow silica particles, acrylic resin and the like. And hollow polymer particles. As the inorganic particles, silica particles having voids prepared by using the technique disclosed in Japanese Patent Application Laid-Open No. 2001-233611 are used, and as organic particles, the technique disclosed in JP-A-2002-80503. As a preferable example, hollow polymer particles prepared using the above are mentioned. Silica having voids as described above or porous silica has a refractive index in the range of 1.20 to 1.44, which is higher than that of general silica particles having a refractive index of about 1.45. Is preferable from the viewpoint of reducing the refractive index of the low refractive index layer.

Hollow silica particles are particles having a function of lowering the refractive index while maintaining the coating film strength of the low refractive index layer. The hollow silica particles used in the present invention are silica fine particles having a structure having cavities inside. The hollow silica particles are silica fine particles whose refractive index decreases in inverse proportion to the occupancy rate of the internal cavity as compared with the original refractive index of the silica fine particles (refractive index n = about 1.46). Therefore, the refractive index of the hollow silica particles as a whole is 1.20 to 1.45.

The hollow silica particles are not particularly limited, and are, for example, fine particles having an outer shell and having a porous or hollow inside, and are JP-A-6-330606, JP-A-7-0131337, JP-A-7. Examples thereof include silica fine particles prepared by using the technique disclosed in 133105 and Japanese Patent Application Laid-Open No. 2001-233611.
The average particle size of the hollow silica particles is preferably 5 to 150 nm, more preferably 8 to 100 nm, and even more preferably 10 to 80 nm. When the average particle size is within this range, excellent transparency can be imparted to the low refractive index layer.

The content of the hollow silica particles in the low refractive index layer is not particularly limited, but is preferably 100 to 260 parts by mass with respect to 100 parts by mass of the resin solid content. Within this range, the coating film strength of the low refractive index layer is not insufficient, the effect of lowering the refractive index by the hollow silica particles can be sufficiently imparted to the low refractive index layer, and the surface is smoothed. , Excellent scratch resistance.

The surface of the hollow silica particles may be pretreated with a silane coupling agent prior to compounding. The silane coupling agent may be a commercially available product, for example, KBM-n1003, KBM-402, KBM-403, KBE-402, KBE-403, KBM-1403, KBM-502, KBM-503 manufactured by Shin-Etsu Chemical Co., Ltd. , KBE-502, KBE-503, KBM-5103, KBM-602, KBE-903, KBE-9103, KBM-573, KBM-803, KBE-846, KBE-9007 and the like, preferably (meth). The silane coupling agents containing an acryloyl group are KBM-502, KBM-503, KBE-502, KBE-503, KBM-5103, and more preferably KBM-503.

As the low refractive index particles, particles capable of forming a nanoporous structure in at least a part of the inside and / or the surface depending on the morphology, structure, agglutination state, and dispersion state inside the film are also preferably mentioned.
Such particles include the above-mentioned silica particles, a release material that is manufactured for the purpose of increasing the specific surface area, and absorbs various chemical substances in a filling column and a porous portion on the surface, and for fixing a catalyst. Examples thereof include porous particles used, and dispersions and aggregates of hollow particles intended to be used for heat insulating materials and low dielectric materials. Specific examples include, for example, "Nipsil (trade name)", "Nipgel (trade name)": manufactured by Nippon Silica Industry Co., Ltd., and "coloidal silica UP series (trade name)": manufactured by Nissan Chemical Industries, Ltd. Be done.

The average particle size of the primary particles of the low refractive index particles is preferably 5 to 200 nm, more preferably 5 to 100 nm, and even more preferably 10 to 80 nm. When the average particle size of the particles is within the above range, the transparency of the low refractive index layer is not impaired, and a good dispersed state of the particles can be obtained. Further, in the present invention, if the average particle size is within the above range, the particles may be formed in a chain.

The low refractive index particles used in the present invention are preferably surface-treated. As the surface treatment of the low refractive index particles, a surface treatment using a silane coupling agent is more preferable, and among these, a surface treatment using a silane coupling agent having a (meth) acryloyl group is preferable. By applying a surface treatment to the low refractive index particles, the affinity with the binder resin described later is improved, the fine particles are uniformly dispersed, and the fine particles are less likely to agglomerate. Therefore, the low refractive index due to the large particles derived from the agglomeration The decrease in transparency of the rate layer, the coatability of the composition for forming a low refractive index layer, and the decrease in the coating strength of the composition are suppressed.

Further, when the silane coupling agent has a (meth) acryloyl group, the silane coupling agent has ionizing radiation curability and easily reacts with a binder resin described later. Therefore, a composition for forming a low refractive index layer. In the coating film of, the low refractive index particles are well fixed to the binder resin. That is, the low refractive index particles have a function as a cross-linking agent in the binder resin. As a result, the tightening effect of the entire coating film can be obtained, and it is possible to impart excellent surface hardness to the low refractive index layer while retaining the flexibility inherent in the binder resin. Therefore, since the low refractive index layer is deformed by utilizing its own flexibility, it has an absorbing force against an external impact and a restoring force, so that the occurrence of scratches is suppressed and the surface hardness is excellent in scratch resistance. Will have.

Silane coupling agents preferably used in the surface treatment of low refractive index particles include 3- (meth) acryloxypropyltrimethoxysilane, 3- (meth) acryloxypropyltriethoxysilane, and 3- (meth) acryloxipropyl. Examples thereof include methyldimethoxysilane, 3- (meth) acryloxypropylmethyldiethoxysilane, 2- (meth) acryloxypropyltrimethoxysilane, 2- (meth) acryloxipropyltriethoxysilane, and the like.

The content of the low refractive index particles in the low refractive index layer is preferably 10 to 95% by mass, more preferably 20 to 90% by mass, still more preferably 30 to 90% by mass. When the content of the fine particles is within the above range, good antireflection properties and surface hardness can be obtained.

Examples of the binder resin contained in the resin composition for forming a low refractive index layer include those exemplified as the binder resin used for forming the high refractive index layer. Further, from the viewpoint of lowering the refractive index of the low refractive index layer, a fluoropolymer that itself exhibits low refractive index is preferably used as the binder resin. A fluorine-containing polymer is a polymer of a polymerizable compound containing at least a fluorine atom in the molecule.

As the fluoropolymer, those containing silicon together with fluorine are preferable in order to impart not only repelling on the surface of the low refractive index layer but also antifouling properties such as wiping property. For example, the copolymer contains a silicone component. A silicone-containing vinylidene fluoride copolymer is preferably used. In this case, the silicone component includes (poly) dimethylsiloxane, (poly) diethylsiloxane, (poly) diphenylsiloxane, (poly) methylphenylsiloxane, alkyl-modified (poly) dimethylsiloxane, azo group-containing (poly) dimethylsiloxane, and the like. , Dimethyl silicone, phenylmethyl silicone, alkyl-aralkyl-modified silicone, fluorosilicone, polyether-modified silicone, fatty acid ester-modified silicone, methyl hydrogen silicone, silanol group-containing silicone, alkoxy group-containing silicone, phenol group-containing silicone, methacryl-modified silicone, Examples thereof include acrylic-modified silicone, amino-modified silicone, carboxylic acid-modified silicone, carbinol-modified silicone, epoxy-modified silicone, mercapto-modified silicone, fluorine-modified silicone, and polyether-modified silicone. Of these, those having a dimethylsiloxane structure are preferable.

The low refractive index layer constituting the antireflection layer used in the present invention preferably has a thickness of 90 to 100 nm and a refractive index of 1.22 to 1.30, more preferably 92 to 98 nm and a refractive index at a wavelength of 550 nm. Is 1.24 to 1.28, more preferably the thickness is 93 to 97 nm, and the refractive index is 1.25 to 1.27. By laminating the low refractive index layer having the thickness and the refractive index in the above range on the high refractive index layer having the specific thickness and the refractive index described above, the reflectance is effectively lowered and there is little discomfort. Color can be easily controlled.

When the thickness of the high refractive index layer is d _H (nm) and the thickness of the low reflectance layer is d _L (nm), d _H is thicker than d _L , and 0.60 <d _L / d _H <0. 82. When d _L / d _H is in this range, the reflectance of the surface of the antiglare optical laminate of the present invention in the visible wavelength range can be controlled within the specific range of the present invention, and the reflection is low and there is little discomfort in color. An antiglare optical laminate can be realized.

As described above, in the antireflection layer used in the present invention, since the lower antiglare layer has an uneven shape, the antireflection layer also has irregularities corresponding to those irregularities. Therefore, the thickness of the low refractive index layer of the antireflection layer used in the present invention is from the interface between the low refractive index layer and the high refractive index layer to the interface between the low refractive index layer and air (from the recess to the recess). (From the convex part to the convex part).

Various additives are blended in the low refractive index layer according to the desired physical properties. Examples of the additive include those similar to the various additives that can be used for the high refractive index layer described above. These additives may be added to the above-mentioned resin composition for forming a low refractive index layer.

When the resin composition for forming a low refractive index layer is used, the low refractive index layer is formed by the same method as the formation of the high refractive index layer using the above resin composition for forming a high refractive index layer. Can be done.

The thickness of the functional layer such as the high refractive index layer, the low refractive index layer, and the antiglare layer can be determined by, for example, a scanning electron microscope (SEM), a transmission electron microscope (TEM), or a scanning transmission electron microscope (STEM). It can be calculated from the average value of the values at 20 points by measuring the thickness at 20 points from the image of the cross section taken by using the method. When the film thickness to be measured is on the order of μm, it is preferable to use SEM, and when the film thickness is on the order of nm, it is preferable to use TEM or STEM. In the case of SEM, the acceleration voltage is preferably 1 to 10 kV and the magnification is preferably 1000 to 7000 times, and in the case of TEM or STEM, the acceleration voltage is preferably 10 to 30 kV and the magnification is preferably 50,000 to 300,000 times.

The refractive index of the functional layer such as the high refractive index layer, the low refractive index layer, and the antiglare layer is determined from, for example, the reflection spectrum measured by the reflected photometric meter and the reflection spectrum calculated from the optical model of the multilayer thin film using the Fresnel coefficient. It can be calculated by fitting with.

The antiglare optical laminate of the present invention described above is excellent in color uniformity while suppressing reflectance. In particular, when the antiglare optical laminate of the present invention is used for a display having a resolution of so-called 4K2K or more having 3840 × 2160 pixels or more, the above effect can be easily exhibited.

In the present invention, various additives are added to the outermost surface thereof to perform various functions, for example, a hard coat function having high hardness and scratch resistance, an antifogging coating function, an antifouling coating function, and an ultraviolet shielding coating. It is also possible to add a function, an infrared shielding coating function, and the like.

[Image display device]
The image display device of the present invention is an image display device in which an antiglare optical laminate is arranged on the front surface of a display, and the antiglare optical laminates are arranged in order from the transparent base material side. It includes an antireflection layer, and the average visual reflectance Y value on the outermost surface of the antireflection layer is 0.40 to 0.60%, and the reflectance at a wavelength of 430 nm is 0.4 to 0.7. %, The reflectance at a wavelength of 630 nm is 0.7 to 1.0%, and the reflectance in the visible wavelength range decreases monotonically to the long wavelength side at a wavelength of 430 nm or less, and monotonically increases to the long wavelength side at a wavelength of 550 nm or more. It is an image display device.

The average visual reflectance Y value on the surface of the antireflection layer of the antiglare optical laminate of the present invention is as described above, and is preferably 0.4 to 0.55%.
The reflectance at a wavelength of 430 nm is as described above, preferably 0.4 to 0.6%. The reflectance at a wavelength of 630 nm is as described above, preferably 0.7 to 0.9%. The reflectance in the visible wavelength range gradually decreases monotonically toward the long wavelength side at a wavelength of 430 nm or less, and the reflectance in the range where the wavelength λ is 430 <λ <550 nm changes almost flatly toward the long wavelength side. Further, at a wavelength of 550 nm or more, the wavelength increases sharply and monotonically toward the long wavelength side.
If the reflectance in the visible wavelength range is within the above range, it is possible to realize an image display device having low reflection and less discomfort in color.

Examples of the display include a liquid crystal display (LCD), a plasma display panel (PDP), a cathode ray tube display device (CRT), an inorganic and organic electroluminescence display, a rear projection display, a vacuum fluorescent display (VFD), and the like. Can be mentioned. Among these, those having a so-called 4K2K or higher resolution having 3840 × 2160 pixels or more are preferable. An ultra-high-definition display with a resolution of 4K2K or higher has less than 1/4 of the amount of light per pixel for the same screen size as compared to a conventional display with 2K1K resolution (Full HD: 1920 x 1080 pixels). Therefore, it is usually susceptible to color.
Further, a display having a resolution of 4K2K or higher has a large screen, and a problem of color uniformity is likely to occur. Therefore, a display having a resolution of 4K2K or higher is suitable in that the effects of the present invention can be easily exhibited.
Examples of the display having a resolution of 4K2K include a display having 3840 × 2160 pixels and a display having 4096 × 2160 pixels.
Further, examples of the image display device include devices equipped with these displays, for example, a personal computer, a personal digital assistant, a game machine, a digital camera, a digital video camera, and the like, including an image display device having a touch panel. Is done.

Next, the present invention will be described in more detail by way of examples, but the present invention is not limited to this example. In addition, "part" and "%" are based on mass unless otherwise specified.

(Example 1)
The following resin composition for forming an antiglare layer is coated on a transparent base material (thickness 60 μm, triacetyl cellulose resin film (TAC), manufactured by Konica Minolta, KC6UAW) with a Meyer bar, and the coating film after coating is applied. After drying at a temperature of 70 ° C. for 30 seconds, the film was cured by irradiating it with ultraviolet rays so that the irradiation dose was 24 mJ / cm ² under a nitrogen purge (oxygen concentration of 200 ppm or less) to form an antiglare layer. .. The thickness of the antiglare layer was 4 μm.
The following resin composition for forming a high refractive index layer is applied onto the obtained antiglare layer with a Meyer bar, and the coated coating film is dried at a temperature of 70 ° C. for 30 seconds and then subjected to nitrogen purging (oxygen). A high refractive index layer having a thickness of 122 nm was formed by irradiating with ultraviolet rays at an irradiation dose of 100 mJ / cm ² and curing at a concentration of 200 ppm or less).
Next, the following resin composition for forming a low refractive index layer is coated with a D bar, and the coated coating film is dried at a temperature of 50 ° C. for 60 seconds and then under nitrogen purging (oxygen concentration 200 ppm or less). Antiglare optical laminate having a transparent base material / antiglare layer / high refractive index layer / low refractive index layer by irradiating with ultraviolet rays at an irradiation dose of 154 mJ / cm ² and curing to form a low refractive index layer having a thickness of 93 nm. I got a body.

<Resin composition for forming antiglare layer>
Silica fine particles (octylsilane treated fumed silica, average primary particle diameter 12 nm, manufactured by Nippon Aerozil): 0.5 parts by mass silica fine particles (methyl treated fumed silica, average primary particle diameter 12 nm, manufactured by Nippon Aerodil): 0. 2 parts by mass pentaerythritol tetraacrylate (PETTA) (product name "PETA", manufactured by Daicel Cytec): 50 parts by mass urethane acrylate (product name "V-4000BA", manufactured by DIC): 50 parts by mass polymerization initiator ( Irgacure 184, manufactured by BASF Japan): 5 parts by mass polyether-modified silicone (product name "TSF4460", manufactured by Momentive Performance Materials): 0.06 parts by mass toluene: 115 parts by mass isopropyl alcohol: 45 parts by mass cyclohexanone : 15 parts by mass

<Resin composition for forming a high refractive index layer>
Sb pentoxide particle dispersion ^{* 1} : 0.95 parts by mass Binder resin ^{* 2} : 0.01 parts by mass DPHA Photopolymerization initiator Irgacure 127 (manufactured by BASF): 0.008 parts by mass Methyl isobutyl ketone: 4.8 parts by mass Part propylene glycol monomethyl ether: 5.2 parts by mass Fluorine-based leveling agent ^{* 3} : 0.29 parts by mass * 1: Antimon particle primary particle size: 10 to 20 nm
* 2: KAYARAD DPHA (trade name), manufactured by Nippon Kayaku Co., Ltd., dipentaerythritol hexaacrylate * 3: F568 (trade name), manufactured by DIC Corporation

<Resin composition for forming a low refractive index layer>
Pentaerythritol triacrylate (PETA): 0.04 parts by mass Hollow silica particle dispersion ^{* 4} : 1.08 parts by mass Solid silica particle dispersion ^{* 5} : 0.083 parts by mass Fluorine-containing antifouling agent ^{* 6} : 0. 208 parts by mass Photopolymerization initiator Irgacure 127 (manufactured by BASF): 0.006 parts by mass Methyl isobutyl ketone: 9.36 parts by mass propylene glycol monomethyl ether: 1.27 parts by mass * 4: Containing hollow silica particles in the dispersion The amount is 30% by mass, and the solvent (methylisobutylketone) content is 70% by mass. The average particle size of the hollow silica particles is 60 nm.
* 5: MIBK-SD (trade name), average primary particle size: 12 nm, solid content: 30% by mass, solvent: methyl isobutyl ketone, silica particle-containing reactive functional group: methacryloyl group * 6: X-71 1203M (commodity) Name): Fluorine-based antifouling agent manufactured by Shin-Etsu Chemical Co., Ltd., 20% by mass solution (solvent: methyl isobutyl ketone)

(Example 2)
An antiglare optical laminate was produced in the same manner as in Example 1 except that the thickness of the high refractive index layer was changed to 150 nm and the thickness of the low refractive index layer was changed to 97 nm in Example 1.

(Comparative Example 1)
An antiglare optical laminate was produced in the same manner as in Example 1 except that the thickness of the high refractive index layer was changed to 155 nm and the thickness of the low refractive index layer was changed to 107 nm in Example 1.

(Comparative Example 2)
An antiglare optical laminate was produced in the same manner as in Example 1 except that the thickness of the high refractive index layer was changed to 167 nm and the thickness of the low refractive index layer was changed to 106 nm in Example 1.

(Comparative Example 3)
An antiglare optical laminate was produced in the same manner as in Example 1 except that the thickness of the high refractive index layer was changed to 147 nm and the thickness of the low refractive index layer was changed to 98 nm in Example 1.

(Comparative Example 4)
An antiglare optical laminate was produced in the same manner as in Example 1 except that the thickness of the high refractive index layer was changed to 165 nm and the thickness of the low refractive index layer was changed to 105 nm in Example 1.

(Comparative Example 5)
An antiglare optical laminate was produced in the same manner as in Example 1 except that the thickness of the high refractive index layer was changed to 165 nm and the thickness of the low refractive index layer was changed to 112 nm in Example 1.

(Comparative Example 6)
In Example 1, the resin composition for forming the antiglare layer was not blended with the translucent fine particles, and the thickness of the high refractive index layer was changed to 164 nm and the thickness of the low refractive index layer was changed to 104 nm. An optical laminate was produced in the same manner.

The following items (1) to (7) were evaluated for the antiglare optical laminates obtained in Examples 1 and 2 and Comparative Examples 1 to 6 (Comparative Example 6 had no antiglare function). The evaluation results are shown in Tables 1 and 2 and FIG. 2 (spectral reflectance curve).

(1) Refractive Index of Each Layer of Optical Laminate The resin composition for forming each layer constituting the optical laminate used in Examples and Comparative Examples is bar-coated on a transparent base material, and the irradiation dose is 200 mJ / cm. A cured resin layer having a thickness of about 160 nm was formed by irradiating with ultraviolet rays in step ² and curing. The refractive index of each of the obtained cured resin layers was measured by an Abbe refractive index meter (manufactured by Atago Co., Ltd., model number: NAR-4T) by irradiating with sodium D line at 25 ° C.
In addition to the method (1), as the measurement of the refractive index, etc., the low refractive index layer and the high refractive index are measured by the optical simulation method from the spectral reflectance curve obtained from the measurement by the apparatus or the like used in the following (2). The presence or absence of a rate layer, the optical film thickness, the refractive index of a low refractive index layer, and the refractive index of a high refractive index layer can also be determined. Here, the optical film thickness (nd) is a value obtained by multiplying the refractive index (n) of the target layer and the thickness (d) of the layer. The refractive index may be measured by different methods depending on the purpose.
(2) Spectral reflectance A black tape is attached to the antiglare optical laminate surface on the side where the low refractive index layer is not formed, which is obtained in each Example and Comparative Example, to prevent backside reflection, and is low. With the surface of the refractive index layer as the light source side, the spectral reflectance in the wavelength range of 380 to 780 nm on the observation surface side was measured using a spectrophotometer (manufactured by Shimadzu Corporation, model number: PC-3100). The measurement conditions at this time were a C light source, a 2 degree field of view, and an incident angle of 5 °. Further, from the obtained spectral reflectance curve (FIG. 2), the rate of change m (400) of the reflectance at a wavelength of 395 nm to 405 nm and the rate of change m (630) of the reflectance at a wavelength of 625 nm to 635 nm were calculated.
(3) Average visual reflectance and hue The average visual reflectance Y value (%) and hue (a ^* , b ^* ) were calculated from the spectral reflectance. At this time, the photopic standard luminosity was used as the luminosity.
(4) The haze (overall haze) was measured according to JIS K-7136: 2000 using a haze haze meter (HM-150, manufactured by Murakami Color Technology Research Institute).

(5) Surface Shape Ra, Rz, θa and Sm were measured on the surface of the antiglare optical laminate on which the low refractive index layer obtained in Examples and Comparative Examples was formed. The definitions of Ra, Rz, Sm and Rz shall be in accordance with JIS B0601: 1994, and θa is the instruction manual (revised 1995.07.20) of the surface roughness measuring instrument (SE-3400) manufactured by Kosaka Research Institute. Shall follow.
Specifically, Ra, Rz, θa and Sm were measured using a surface roughness measuring instrument (model number: SE-3400 / manufactured by Kosaka Research Institute) under the following measurement conditions.
(Needle of surface roughness detection part)
Product name SE2555N manufactured by Kosaka Research Institute (tip radius of curvature: 2 μm, apex angle: 90 degrees, material: diamond)
(Measurement conditions of surface roughness measuring instrument)
-Reference length (cutoff value of roughness curve λc): 0.8 mm
-Evaluation length (reference length (cutoff value λc) x 5): 4.0 mm
・ Feeding speed of stylus: 0.5 mm / s
-Preliminary length: (cutoff value λc) x 2
・ Vertical magnification: 2000 times ・ Horizontal magnification: 10 times

(6) Anti-glare A sample for evaluation, in which a black acrylic plate is attached via a transparent adhesive, is placed on a horizontal surface on the transparent base material side of the anti-glare optical laminates obtained in Examples and Comparative Examples. From various angles, the fluorescent lamp is placed 1.5 m above the evaluation sample, the image of the fluorescent lamp is projected on the evaluation sample, and the illuminance on the evaluation sample is 800 to 1200 lux. Visual sensory evaluation was performed and evaluated according to the following criteria.
Evaluation Criteria Fluorescent lamp image cannot be recognized from any angle: ○
The image of the fluorescent lamp is reflected, but the outline of the fluorescent lamp is blurred and the boundary of the outline cannot be recognized: △
The image of the fluorescent lamp is reflected like a mirror surface, and the outline of the fluorescent lamp (the boundary of the outline) can be clearly recognized: ×

(7) Taste and Color Uniformity For the anti-glare optical laminate or the optical laminate without anti-glare layer obtained in Examples and Comparative Examples, the same evaluation sample as in (6) was prepared and the same. Under the environment, the incident angle of the fluorescent lamp perpendicularly incident on the surface of the low refractive index layer on the transparent substrate of the evaluation sample is 0 degree, and the incident angle is 2.5 degrees (hereinafter, referred to as “frontal incident”. ), The normal reflected light of the fluorescent lamp when the fluorescent lamp is incident on the evaluation sample, and similarly, the fluorescence when the fluorescent lamp is incident on the evaluation sample at an incident angle of 60 degrees (hereinafter referred to as “oblique incident”). By visually observing the positively reflected light of the lamp, whether or not there is a sense of discomfort in the color of the reflected light (whether or not it exceeds the permissible limit of the color of the reflected light), and whether or not the color uniformity is reduced. It was evaluated according to the following criteria. The number of subjects was 10.
Color [8 to 10 subjects who do not exceed the permissible limit for both frontal and oblique incidence]: ○
[4 to 7 subjects who do not exceed the permissible limit for both frontal and oblique incidence]: △
[0 to 3 subjects who do not exceed the permissible limit for both frontal and oblique incidence]: ×
Color uniformity [Neutral and good with almost no decrease in color uniformity between frontal and oblique incidence: 10 subjects]: ○
[There is a decrease in color uniformity between frontal and oblique incidence: one or more subjects]: ×

From Tables 1 and 2, the antiglare optical laminates of Examples 1 and 2 of the present invention have an antiglare function, and even if the reflectance is low, the reflected light from the frontal incident and the oblique incident can be emitted. When observed, as compared with Comparative Examples 1 to 5, no discomfort was felt in the color and no decrease in color uniformity was felt. On the other hand, although the antiglare optical laminates of Comparative Examples 1 to 5 had an antiglare function, a sense of discomfort was felt in the color and a decrease in color uniformity was also felt.

The antiglare optical laminate of the present invention can be suitably used on the display surface of an image display device such as a liquid crystal display or an organic EL display.

1: Anti-glare optical laminate 2: Transparent base material 3: Anti-glare layer 4: Translucent particles 5: High refractive index layer 6: Low refractive index layer

Claims (9)

An antiglare optical laminate containing an antiglare layer and an antireflection layer in this order from the transparent base material side.
The surface of the antiglare layer has an uneven shape, and the antireflection layer has a two-layer structure consisting of a high refractive index layer and a low refractive index layer laminated on the high refractive index layer, and the high refractive index layer. The physical thickness of the rate layer is 122 to 150 nm, and the physical thickness of the low refractive index layer is 90 to 100 nm.
The average visual reflectance Y value on the outermost surface of the antireflection layer is 0.4 to 0.6%, the reflectance at a wavelength of 430 nm is 0.4 to 0.7%, and the reflectance at a wavelength of 630 nm is 0.7. It is ~ 1.0%, and the reflectance in the visible wavelength range monotonically decreases toward the long wavelength side at a wavelength of 430 nm or less, and monotonically increases toward the long wavelength side at a wavelength of 550 nm or more.
For the average luminosity reflectance Y value, a black tape is attached to the surface of the antiglare optical laminate on the side where the low refractive index layer is not formed, and the surface of the low refractive index layer is set to the light source side. The spectral reflectance at a wavelength of 380 to 780 nm is measured using a spectrophotometer under the conditions of a C light source, a 2 degree field of view, and an incident angle of 5 °, and the luminosity is determined from the spectral reflectance. It is calculated as sensitivity,
Anti-glare optical laminate. When the rate of change of the reflectance of the reflectance curve in the visible wavelength range is m (400) and the rate of change of the reflectance of the wavelength of 625 nm to 635 nm is m (630), m (400) and m ( The antiglare optical laminate according to claim 1, wherein 630) satisfies −0.019 ≦ m (400) <−0.005 and 0.005 ≦ m (630) <0.0085, respectively. The ratio (Y / Z) of the average visual reflectance Y value (%) to the minimum reflectance Z (%) of the reflectance curve in the visible wavelength range is 1.20 ≦ Y / Z ≦ 1.50. , The antiglare optical laminate according to claim 1 or 2. The antiglare optical laminate according to any one of claims 1 to 3, wherein the total haze value of the antiglare optical laminate is 0.1 to 60%. The average spacing of irregularities defined by JIS-B0601-1994 on the surface of the antiglare layer is Sm (μm), the average inclination angle is θa (degrees), the arithmetic average roughness is Ra (μm), and the 10-point average roughness is defined. The antiglare optical laminate according to any one of claims 1 to 4, wherein Sm, θa, Ra and Rz satisfy the following (a) to (d) when Rz (μm) is set.
(A) 30 μm ≤ Sm ≤ 500 μm
(B) 0.05 degrees ≤ θa ≤ 5 degrees (c) 0.08 μm ≤ Ra ≤ 0.50 μm
(D) 0.2 μm ≤ Rz ≤ 2.0 μm Hue of specularly reflected light (CIE1976L ^* a ^* b ^* color space) with respect to 5 degree incident light of CIE standard light source D65 in the wavelength range λ (380 ≦ λ ≦ 780 nm) on the surface of the low refractive index layer of the antireflection layer. L ^* a ^* b ^* Reflected hue in the chromaticity system) a ^* , b ^* is 3.50 ≤ a ^* ≤ 6.00, -1.40 ≤ b ^* ≤ 3.00, claims 1 to 1. The antiglare optical laminate according to any one of 5. Any of claims 1 to 6, wherein the high refractive index layer has a refractive index of 1.61 to 1.66 at a wavelength of 550 nm, and the low refractive index layer has a refractive index of 1.22 to 1.30 at a wavelength of 550 nm. The anti-glare optical laminate according to item 1. An image display device in which an antiglare optical laminate is arranged on the front surface of a display.
The antiglare optical laminate includes an antiglare layer and an antireflection layer in this order from the transparent substrate side, and the surface of the antiglare layer has an uneven shape, and the antireflection layer has a high refractive index. It is a two-layer structure consisting of a layer and a low refractive index layer laminated on the high refractive index layer, and the physical thickness of the high refractive index layer is 122 to 150 nm, and the physical thickness of the low refractive index layer is 90 to 100 nm. ,
The average visual reflectance Y value on the outermost surface of the antireflection layer is 0.40 to 0.60%, the reflectance at a wavelength of 430 nm is 0.4 to 0.7%, and the reflection at a wavelength of 630 nm. The reflectance is 0.7 to 1.0%, and the reflectance in the visible wavelength range monotonically decreases toward the long wavelength side at a wavelength of 430 nm or less, and monotonically increases toward the long wavelength side at a wavelength of 550 nm or more.
For the average luminosity reflectance Y value, a black tape is attached to the surface of the antiglare optical laminate on the side where the low refractive index layer is not formed, and the surface of the low refractive index layer is set to the light source side. The spectral reflectance at a wavelength of 380 to 780 nm is measured using a spectrophotometer under the conditions of a C light source, a 2 degree field of view, and an incident angle of 5 °, and the luminosity is determined from the spectral reflectance. It is calculated as sensitivity,
Image display device. The image display according to claim 8, wherein the high refractive index layer has a refractive index of 1.61 to 1.66 at a wavelength of 550 nm, and the low refractive index layer has a refractive index of 1.22 to 1.30 at a wavelength of 550 nm. apparatus.