WO2020100958A1

WO2020100958A1 - Antiglare film, method for manufacturing antiglare film, optical member, and image display device

Info

Publication number: WO2020100958A1
Application number: PCT/JP2019/044614
Authority: WO
Inventors: 佑輔茂手木; 尚樹橋本; 済木　雄二
Original assignee: 日東電工株式会社
Priority date: 2018-11-14
Filing date: 2019-11-13
Publication date: 2020-05-22
Also published as: TW202026674A; JP7343273B2; SG11202105022TA; JP2020079914A; CN113039463A; KR20210090240A

Abstract

Provided is an antiglare film in which generation of white mist is suppressed. An antiglare film according to the present invention is an antiglare film (10) in which an antiglare layer (B) (12) is laminated on a light transmitting substrate (A) (11), wherein the antiglare film (10) is characterized in that recesses and protrusions are formed on the outermost surface on the antiglare layer (B) (12) side in the antiglare film (10), and the recesses and protrusions satisfy the following numerical equations (1) and (2). (1): θa ≤ 0.24, (2): Rz ≤ 0.20. In the numerical equation (1), θa is the average inclination angle [º] of the recesses and protrusions, and in the numerical equation (2), Rz is the ten-point average height [μm] of the recesses and protrusions.

Description

Antiglare film, method for producing antiglare film, optical member, and image display device

The present invention relates to an antiglare film, a method for manufacturing an antiglare film, an optical member, and an image display device.

Various image display devices such as a cathode ray tube display device (CRT), a liquid crystal display device (LCD), a plasma display panel (PDP) and an electroluminescence display (ELD) include fluorescent lamps and sunlight on the surface of the image display device. Is subjected to anti-glare treatment to prevent a reduction in contrast due to reflection of external light or reflection of an image. Especially, as the screen of an image display device becomes larger, an anti-glare film is formed. The number of attached image display devices is increasing.

There are many documents that describe the antiglare film, for example, Patent Documents 1 and 2.

JP, 2009-109683, A JP-A-2003-202416

In the anti-glare film, when the light source is reflected, a color difference with a wavy black and white shape (hereinafter referred to as “white haze”) may occur. In a display (image display device) or the like using an antiglare film, if the appearance of white smear is remarkable, the appearance quality may be deteriorated.

Therefore, an object of the present invention is to provide an antiglare film in which generation of white haze is suppressed, a method for producing an antiglare film, an optical member, and an image display device.

In order to achieve the above object, the first antiglare film of the present invention,
An antiglare film having an antiglare layer (B) laminated on a light transmissive substrate (A),
Unevenness is formed on the outermost surface of the antiglare film on the antiglare layer (B) side,
It is characterized in that the unevenness satisfies the following mathematical formulas (1) and (2).

θa ≦ 0.24 (1)
Rz ≦ 0.20 (2)

In the formula (1), θa is the average inclination angle [°] of the unevenness,
In the formula (2), Rz is the ten-point average height [μm] of the irregularities.

In order to achieve the above object, the second antiglare film of the present invention comprises
An antiglare film in which an antiglare layer (B) and other layers are laminated on the light transmissive substrate (A) in the above order,
Unevenness is formed on the outermost surface of the other layer,
It is characterized in that the unevenness satisfies the following mathematical formulas (1) and (2). In the following, the first and second antiglare films of the present invention may be collectively referred to as the “antiglare film of the present invention”.

θa ≦ 0.24 (1)
Rz ≦ 0.20 (2)

In the formula (1), θa is the average inclination angle [°] of the unevenness,
In the formula (2), Rz is the ten-point average height [μm] of the irregularities.

The method for producing the antiglare film of the present invention,
An antiglare layer (B) forming step of forming the antiglare layer (B) on the light transmissive substrate (A);
An unevenness forming step of forming the unevenness on the outermost surface of the antiglare film on the antiglare layer (B) side so as to satisfy the mathematical formulas (1) and (2),
In the step of forming the antiglare layer (B), a coating step of applying a coating solution on the light-transmitting substrate (A) and a step of drying the applied coating solution to form a coating film. Including a coating film forming step,
It is characterized in that the coating liquid contains a resin and a solvent.

The optical member of the present invention is an optical member including the antiglare film of the present invention.

The image display device of the present invention is an image display device including the antiglare film of the present invention or the optical member of the present invention.

According to the present invention, it is possible to provide an antiglare film in which occurrence of white smear is suppressed, a method for producing an antiglare film, an optical member, and an image display device.

FIG. 1 is a sectional view showing an example of the constitution of the antiglare film of the present invention. FIG. 2 is a cross-sectional view showing another example of the structure of the antiglare film of the present invention. FIG. 3 is a sectional view showing still another example of the constitution of the antiglare film of the present invention. FIG. 4 is a sectional view showing still another example of the structure of the antiglare film of the present invention.

Next, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following description.

The antiglare film of the present invention may further satisfy, for example, the following mathematical formula (3).

Ra ≦ 0.050 (3)

In the mathematical expression (3), Ra is the arithmetic average surface roughness [μm] of the irregularities.

In the antiglare film of the present invention, for example, another layer may be further laminated on the surface of the antiglare layer (B) opposite to the light transmissive substrate (A). The other layer may be, for example, a low reflection layer.

In the antiglare film of the present invention, for example, the antiglare layer (B) may contain a binder resin and a cohesive filler. The cohesive filler may be, for example, an organic clay.

In the antiglare film of the present invention, for example, the antiglare layer (B) may not include particles.

In the method for producing an antiglare film of the present invention, for example, the antiglare layer (B) forming step may further include a curing step of curing the coating film.

In the method for producing an antiglare film of the present invention, for example, the solvent may contain toluene and methyl ethyl ketone.

In the method for producing an antiglare film of the present invention, for example, the antiglare film is an antiglare film including the other layer, and the unevenness forming step is performed on the antiglare layer (B). Another layer forming step of forming another layer may be included.

The optical member of the present invention may be, for example, a polarizing plate.

[1. Anti-glare film]
As described above, the first antiglare film of the present invention is the antiglare film in which the antiglare layer (B) is laminated on the light transmissive substrate (A), and The outermost surface on the antiglare layer (B) side is formed with irregularities, and the irregularities satisfy the following mathematical formulas (1) and (2).

θa ≦ 0.24 (1)
Rz ≦ 0.20 (2)

In the formula (1), θa is the average inclination angle [°] of the unevenness,
In the formula (2), Rz is the ten-point average height [μm] of the irregularities.

As described above, the second antiglare film of the present invention is an antiglare film in which the antiglare layer (B) and the other layers are laminated in the above order on the light transmissive substrate (A). The unevenness is formed on the outermost surface of the other layer, and the unevenness satisfies the following mathematical formulas (1) and (2).

θa ≦ 0.24 (1)
Rz ≦ 0.20 (2)

In the formula (1), θa is the average inclination angle [°] of the unevenness,
In the formula (2), Rz is the ten-point average height [μm] of the irregularities.

The cross-sectional view of FIG. 1 shows an example of the structure of the antiglare film of the present invention. As shown in the figure, the antiglare film 10 has an antiglare layer (B) 12 laminated on one surface of a light transmissive substrate (A) 11. The antiglare layer (B) 12 includes particles 12b and a thixotropy imparting agent 12c in the resin layer 12a. On the surface of the antiglare layer (B) 12 opposite to the light transmissive substrate (A) 11, a low reflection layer (C) 13 is further laminated as the other layer. Unevenness is formed on the outermost surface of the antiglare film 10 on the antiglare layer (B) 12 side (the surface of the low reflection layer (C) 13 opposite to the light transmissive substrate (A) 11). There is. The average inclination angle θa of the irregularities is 0.24 ° or less as described above, and the ten-point average height (also referred to as ten-point average roughness or ten-point average surface roughness) Rz of the irregularities is as described above. As described above, it is 0.20 μm or less. However, the antiglare film of the present invention is not limited to this, and for example, the particles 12b, the thixotropy imparting agent 12c, and the other layer (low reflection layer (C)) 13 may or may not be present.

The sectional view of FIG. 2 shows another example of the structure of the antiglare film of the present invention. As shown in the figure, the structure of the antiglare film 10 is the same as that of the antiglare film 10 of FIG. 1 except that the other layer (low reflection layer (C)) 13 is not provided. Further, in the antiglare film 10 of FIG. 2, the outermost surface on the antiglare layer (B) 12 side (the surface of the antiglare layer (B) 12 opposite to the light transmissive substrate (A) 11) is , Unevenness is formed. The average inclination angle θa of the irregularities is 0.24 ° or less, and the ten-point average height Rz of the irregularities is 0.20 μm or less.

The sectional view of FIG. 3 shows still another example of the structure of the antiglare film of the present invention. As shown, the structure of the antiglare film 10 is the same as that of FIG. 1 except that the antiglare layer (B) 12 does not contain the particles 12b. Further, the sectional view of FIG. 4 shows still another example of the configuration of the antiglare film of the present invention. As shown, the structure of the antiglare film 10 is the same as that of FIG. 2 except that the antiglare layer (B) 12 does not contain the particles 12b.

In the antiglare film of the present invention, the "outermost surface on the antiglare layer (B) side" is the outermost surface on the antiglare layer (B) side. Specifically, the "outermost surface on the antiglare layer (B) side" is the translucent substrate in the antiglare layer (B) when the other layer is not present (for example, FIGS. 2 and 4). This is the surface on the side opposite to (A). Further, the “outermost surface on the antiglare layer (B) side” means that when the other layer is present (for example, FIGS. 1 and 3), the other layer (the low reflection layer (C) 13 in FIGS. 1 and 3). 2) is the outermost surface on the side opposite to the translucent substrate (A).

The antiglare film of the present invention has excellent antiglare properties even if the θa and Rz are small and the unevenness of the outermost surface is gentle, and the occurrence of white smear can be suppressed as described above. Particularly, in a general antiglare film, when a low reflection layer is provided on the antiglare layer, the occurrence of white smear may be more remarkable. However, according to the antiglare film of the present invention, even if the low reflection layer (C) is provided on the antiglare layer (B), generation of white smear can be suppressed.

Further, in FIGS. 1 and 3, the other layer is the low reflection layer (C) 13, but in the antiglare film of the present invention, the other layer is not limited to the low reflection layer. The other layer may be, for example, a low refractive index layer, a low reflective layer, a conductive layer, an antifouling layer, a high hardness layer, a high refractive index layer, a UV absorbing layer, or the like. The other layer may be a single layer or a plurality of layers. In the case of a plurality of layers, one type or a plurality of types may be used. For example, the other layer may be an optical thin film whose thickness and refractive index are strictly controlled, or a laminate of two or more optical thin films.

As described above, in the antiglare film of the present invention, the average inclination angle θa (°) is 0.24 or less in the uneven shape of the outermost surface on the antiglare layer (B) side. The average tilt angle θa may be, for example, 0.23 ° or less, 0.20 ° or less, or 0.19 ° or less. The lower limit of the average inclination angle θa is not particularly limited, but is, for example, a value of 0 ° or more or a value exceeding 0 °, 0.10 ° or more, 0.11 ° or more, 0.13 ° or more, or 0.15. It may be more than °. The average inclination angle θa is, for example, more than 0 ° and 0.23 ° or less, 0.10 ° or more and 0.23 ° or less, 0.11 ° or more and 0.23 ° or less, 0.13 ° or more and 0.23 °. Below, 0.15 ° to 0.23 °, above 0 ° to 0.20 °, 0.10 ° to 0.20 °, 0.11 ° to 0.20 °, 0.13 ° or more 0.20 ° or less, 0.15 ° or more and 0.20 ° or less, more than 0 ° and 0.19 ° or less, 0.10 ° or more and 0.19 ° or less, 0.11 ° or more and 0.19 ° or less, 0 It may be 0.13 ° or more and 0.19 ° or less, or 0.15 ° or more and 0.19 ° or less. Here, the average tilt angle θa is a value defined by the following mathematical expression (3). The average inclination angle θa can be measured, for example, by the method described in Examples below.

Average tilt angle θa = tan ⁻¹ Δa (3)

In the mathematical expression (3), Δa is, as shown in the following mathematical expression (4), the sum of the peaks and valleys of the adjacent peaks in the reference length L of the roughness curve defined in JIS B 0601 (1994 version). It is a value obtained by dividing the total (h1 + h2 + h3 ... + hn) of the difference (height h) from the lowest point by the reference length L. The roughness curve is a curve obtained by removing a surface waviness component longer than a predetermined wavelength from a cross-section curve by a phase difference compensation type high-pass filter. Further, the cross-sectional curve is a contour that appears at the cut when the target surface is cut by a plane perpendicular to the target surface.

Δa = (h1 + h2 + h3 ... + hn) / L (4)

Further, in the antiglare film of the present invention, as described above, in the irregular shape of the outermost surface on the antiglare layer (B) side, the ten-point average height Rz of the irregularities is 0.20 μm or less. The ten-point average height Rz may be, for example, 0.19 μm or less, or 0.18 μm or less. The lower limit of the ten-point average height Rz is not particularly limited, but is, for example, a value of 0 μm or more or a value exceeding 0 μm, 0.10 μm or more, 0.12 μm or more, 0.13 μm or more, or 0.17 μm or more. May be. The ten-point average height Rz is, for example, more than 0 μm and 0.20 μm or less, 0.10 μm or more and 0.20 μm or less, 0.12 μm or more and 0.20 μm or less, 0.13 μm or more and 0.20 μm or less, 0.17 μm or more. 0.20 μm or less, 0 μm or more and 0.19 μm or less, 0.10 μm or more and 0.19 μm or less, 0.12 μm or more and 0.19 μm or less, 0.13 μm or more and 0.19 μm or less, 0.17 μm or more and 0.19 μm or less, 0 μm 0.18 μm or more, 0.10 μm or more and 0.18 μm or less, 0.12 μm or more and 0.18 μm or less, 0.13 μm or more and 0.18 μm or less, or 0.17 μm or more and 0.18 μm or less. The ten-point average height Rz can be measured, for example, by the method described in Examples below.

In the uneven shape of the outermost surface on the antiglare layer (B) side, the arithmetic average surface roughness (also referred to as arithmetic average height) Ra is not particularly limited, but is, for example, 0.050 μm or less as described above. Good. The arithmetic average surface roughness Ra may be, for example, 0.048 μm or less, 0.045 μm or less, or 0.043 μm or less. The lower limit of the arithmetic average surface roughness Ra is not particularly limited, but is, for example, a value of 0 μm or more or a value exceeding 0 μm, and is 0.010 μm or more, 0.020 μm or more, 0.030 μm or more, or 0.035 μm or more. May be. The arithmetic average surface roughness Ra is, for example, more than 0 μm and 0.050 μm or less, 0.010 μm or more and 0.050 μm or less, 0.020 μm or more and 0.050 μm or less, 0.030 μm or more and 0.050 μm or less, 0.035 μm or more. 0.050 μm or less, 0 μm or more and 0.048 μm or less, 0.010 μm or more and 0.048 μm or less, 0.020 μm or more and 0.048 μm or less, 0.030 μm or more and 0.048 μm or less, 0.035 μm or more and 0.048 μm or less, 0 μm 0.045 μm or less, 0.010 μm or more and 0.045 μm or less, 0.020 μm or more and 0.045 μm or less, 0.030 μm or more and 0.045 μm or less, 0.035 μm or more and 0.045 μm or less, or 0 μm or more and 0.043 μm or less , 0.010 μm or more and 0.043 μm or less, 0.020 μm or more and 0.043 μm or less, 0.030 μm or more and 0.043 μm or less, or 0.035 μm or more and 0.043 μm or less. In order to prevent external light and an image from being reflected on the surface of the antiglare hard coat film, it is preferable that the surface has some roughness, that is, Ra is large to some extent. When Ra is in the above range, for example, when used in an image display device or the like, scattering of reflected light when viewed from an oblique direction is suppressed, white blur is improved, and contrast in a bright place is also improved. Can be improved. In the present invention, the “arithmetic mean surface roughness Ra” is the arithmetic mean surface roughness Ra specified in JIS B 0601 (1994 version).

In the uneven shape of the outermost surface on the side of the antiglare layer (B), the average distance between the uneven surfaces Sm (mm) is not particularly limited, but may be in the range of 0.025 to 0.275, for example. Thereby, for example, an antiglare hard coat film having excellent antiglare properties and capable of preventing white blur is obtained. In the present invention, the average unevenness distance Sm (mm) on the surface of the antiglare layer (B) is the average unevenness distance Sm (mm) on the surface measured according to JIS B0601 (1994 version). The Sm may be, for example, 0.050 mm or more, 0.075 mm or more, 0.100 mm or more, or 0.125 mm or more, and 0.250 mm or less, 0.225 mm or less, 0.200 mm or less, or 0. It may be 175 mm or less. The Sm is, for example, 0.050 mm to 0.250 mm, 0.050 mm to 0.225 mm, 0.050 mm to 0.200 mm, 0.050 mm to 0.175 mm, 0.075 mm to 0.250 mm. , 0.075 mm or more and 0.225 mm or less, 0.075 mm or more and 0.200 mm or less, 0.075 mm or more and 0.175 mm or less, 0.100 mm or more and 0.250 mm or less, 0.100 mm or more and 0.225 mm or less, 0.100 mm or more 0.200 mm or less, 0.100 mm or more and 0.175 mm or less, 0.125 mm or more and 0.250 mm or less, 0.125 mm or more and 0.225 mm or less, 0.125 mm or more and 0.200 mm or less, or 0.125 mm or more and 0.175 mm or less May be

In the antiglare film of the present invention, the haze value is not particularly limited, but may be in the range of 0 to 10%, for example. The haze value is the haze value (cloudiness) of the entire antiglare film according to JIS K 7136 (2000 version). The haze value is more preferably in the range of 0 to 5%, further preferably in the range of 0 to 3%. In order to set the haze value in the above range, it is preferable to select the particles and the resin so that the difference in refractive index between the particles and the resin is in the range of 0.001 to 0.02. When the haze value is within the above range, a clear image can be obtained and the contrast in a dark place can be improved.

Hereinafter, each of the light transmissive substrate (A), the antiglare layer (B) and the other layer will be described with further examples. In the following, a case where the antiglare layer (B) is an antiglare hard coat layer and a case where the other layer is a low reflection layer (C) are mainly described. Is not limited to this.

The light transmissive substrate (A) is not particularly limited, but examples thereof include a transparent plastic film substrate. The transparent plastic film substrate is not particularly limited, but preferably has a visible light transmittance (preferably a light transmittance of 90% or more) and excellent transparency (preferably a haze value of 1% or less). For example, the transparent plastic film substrate described in JP-A-2008-90263 can be used. As the transparent plastic film substrate, one having an optically small birefringence is preferably used. The antiglare film of the present invention can be used, for example, in a polarizing plate as a protective film, and in this case, the transparent plastic film substrate includes triacetyl cellulose (TAC), polycarbonate, acrylic polymer, A film formed of a polyolefin or the like having a cyclic or norbornene structure is preferable. Further, in the present invention, as will be described later, the transparent plastic film substrate may be the polarizer itself. With such a configuration, a protective layer made of TAC or the like is not required and the structure of the polarizing plate can be simplified, so that the number of manufacturing steps of the polarizing plate or the image display device can be reduced and the production efficiency can be improved. Further, with such a configuration, the polarizing plate can be made thinner. When the transparent plastic film substrate is a polarizer, the antiglare layer (B) and the low reflection layer (C) serve as protective layers. Further, with such a configuration, the antiglare film also has a function as a cover plate when it is mounted on the surface of the liquid crystal cell, for example.

In the present invention, the thickness of the light-transmissive substrate (A) is not particularly limited, but in consideration of workability such as strength and handleability and thin layer property, for example, 10 to 500 μm, 20 to 300 μm. Or in the range of 30 to 200 μm. The refractive index of the light transmissive substrate (A) is not particularly limited. The refractive index is, for example, in the range of 1.30 to 1.80 or 1.40 to 1.70.

In the antiglare film of the present invention, for example, the resin contained in the light transmissive substrate (A) may contain an acrylic resin.

In the antiglare film of the present invention, for example, the light transmissive substrate (A) may be an acrylic film.

In the antiglare film of the present invention, for example, the antiglare layer (B) may contain a resin and a filler. The filler may include at least one of particles and a thixotropic agent.

For example, when the antiglare layer (B) does not contain particles and contains a thixotropy-imparting agent, the antiglare film of the present invention in which the θa and Rz are small and the unevenness of the outermost surface is gentle can be obtained. it can. Further, even when the antiglare layer (B) contains a thixotropy-imparting agent and particles having a small particle size, similarly, the θa and Rz are small and the unevenness of the outermost surface is gentle. It can be a film.

In the antiglare film of the present invention, for example, the resin contained in the antiglare layer (B) may contain an acrylate resin (also referred to as an acrylic resin).

In the antiglare film of the present invention, for example, the resin contained in the antiglare layer (B) may contain a urethane acrylate resin.

In the antiglare film of the present invention, for example, the resin contained in the antiglare layer (B) may be a copolymer of a curable urethane acrylate resin and a polyfunctional acrylate.

In the antiglare film of the present invention, for example, the antiglare layer (B) is formed using an antiglare layer forming material containing a resin and a filler, and the antiglare layer (B) contains the filler. The antiglare layer (B) may have an aggregating portion that forms a convex portion by aggregating. In addition, in the aggregating portion forming the convex portion, a plurality of the fillers may be present in a state gathered in one direction in the surface direction of the antiglare layer (B). In the image display device of the present invention, for example, the antiglare film of the present invention may be arranged such that one direction in which a plurality of the fillers are gathered and the long side direction of the black matrix pattern match.

In the antiglare film of the present invention, the thixotropy-imparting agent may be, for example, at least one selected from the group consisting of organic clay, oxidized polyolefin, and modified urea. Further, the thixotropy imparting agent may be, for example, a thickener.

In the antiglare film of the present invention, for example, the thixotropy-imparting agent may be contained in the range of 0.2 to 5 parts by weight with respect to 100 parts by weight (mass) of the resin in the antiglare layer (B). Good.

In the antiglare film of the present invention, the particles are contained in an amount of, for example, 0.2 to 12 parts by weight or 0.5 to 12 parts by weight with respect to 100 parts by weight of the resin in the antiglare layer (B). It may be.

In the method for producing an antiglare film of the present invention, the surface shape of the antiglare film is further adjusted by adjusting the number of parts by weight of the particles with respect to 100 parts by weight of the resin in the material for forming an antiglare layer. May be.

By having an agglomerated portion obtained by aggregating particles, for example, the antiglare film of the present invention in which the uneven shape of the antiglare film is gentle can be obtained. Further, for example, by having the agglomerated portion, the average inter-concave distance Sm (mm) on the surface of the antiglare layer (B) becomes large. The antiglare film having such a surface shape can effectively prevent the reflection of a fluorescent lamp or the like. However, the antiglare film of the present invention is not limited to this.

The antiglare layer (B) is applied, for example, by coating a coating liquid containing the resin, the filler and a solvent on at least one surface of the light transmissive substrate (A) as described below. It is formed by forming a film and then removing the solvent from the coating film. Examples of the resin include a thermosetting resin and an ionizing radiation curable resin that is cured by ultraviolet rays or light. As the resin, it is also possible to use a commercially available thermosetting resin, ultraviolet curable resin, or the like.

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

For the resin, for example, a reactive diluent having at least one of an acrylate group and a methacrylate group can be used. As the reactive diluent, for example, the reactive diluent described in JP-A-2008-88309 can be used, and examples thereof include monofunctional acrylate, monofunctional methacrylate, polyfunctional acrylate, and polyfunctional methacrylate. As the reactive diluent, trifunctional or higher functional acrylate and trifunctional or higher functional methacrylate are preferable. This is because the hardness of the antiglare layer (B) can be made excellent. Examples of the reactive diluent also include butanediol glycerin ether diacrylate, acrylate of isocyanuric acid, and methacrylate of isocyanuric acid. These may be used alone or in combination of two or more.

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

The particle diameter (D) (weight average particle diameter) of the particles is not particularly limited, but is, for example, in the range of 2 to 10 μm. By setting the weight average particle diameter of the particles in the above range, for example, an antiglare film having more excellent antiglare properties and suppressed glare can be obtained. From the viewpoint of suppressing reflection from an oblique direction, it is preferable that the weight average particle diameter of the particles is not too small. From the viewpoint of suppressing reflection from the front direction, it is preferable that the weight average particle diameter of the particles is not too large. The weight average particle diameter of the particles may be, for example, 2.2 μm or more, 2.3 μm or more, 2.5 μm or more, or 3.0 μm or more, and is 9.0 μm or less, 8.0 μm or less, 7.0 μm. Or less, or 6.0 μm or less. The weight average particle diameter of the particles is, for example, 2.2 μm or more and 9.0 μm or less, 2.2 μm or more and 8.0 μm or less, 2.2 μm or more and 7.0 μm or less, 2.2 μm or more and 6.0 μm or less, 2.3 μm. Or more and 9.0 μm or less, 2.3 μm or more and 8.0 μm or less, 2.3 μm or more and 7.0 μm or less, 2.3 μm or more and 6.0 μm or less, 2.5 μm or more and 9.0 μm or less, 2.5 μm or more and 8.0 μm or less , 2.5 μm or more and 7.0 μm or less, 2.5 μm or more and 6.0 μm or less, 3.0 μm or more and 9.0 μm or less, 3.0 μm or more and 8.0 μm or less, 3.0 μm or more and 7.0 μm or less, or 3.0 μm It may be 6.0 μm or less. The weight average particle diameter of the particles can be measured, for example, by the Coulter counting method. For example, by using a particle size distribution measuring device (trade name: Coulter Multisizer, manufactured by Beckman Coulter, Inc.) using a pore electrical resistance method, an electrolyte solution corresponding to the volume of the particles when the particles pass through the pores is used. By measuring the electric resistance, the number and volume of the particles are measured, and the weight average particle diameter is calculated.

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

The proportion of the particles in the antiglare layer (B) is, for example, 0.1 parts by weight or more, 0.2 parts by weight or more, 0.3 parts by weight or more, or 0.5 parts by weight with respect to 100 parts by weight of the resin. The amount may be not less than 10 parts by weight, not more than 10 parts by weight, not more than 8 parts by weight, not more than 7 parts by weight, or not more than 6 parts by weight. The ratio of the particles is, for example, 0.1 parts by weight or more and 10 parts by weight or less, 0.1 parts by weight or more and 8 parts by weight or less, 0.1 parts by weight or more and 7 parts by weight or less, and 0 parts by weight to 100 parts by weight of the resin. 1 part by weight or more and 6 parts by weight or less, 0.2 parts by weight or more and 10 parts by weight or less, 0.2 parts by weight or more and 8 parts by weight or less, 0.2 parts by weight or more and 7 parts by weight or less, 0.2 parts by weight or more 6 Parts by weight or less, 0.3 parts by weight or more and 10 parts by weight or less, 0.3 parts by weight or more and 8 parts by weight or less, 0.3 parts by weight or more and 7 parts by weight or less, 0.3 parts by weight or more and 6 parts by weight or less, 0. It may be 5 parts by weight or more and 10 parts by weight or less, 0.5 parts by weight or more and 8 parts by weight or less, 0.5 parts by weight or more and 7 parts by weight or less, or 0.5 parts by weight or more and 6 parts by weight or less. By setting the proportion of the particles in the above range, for example, the agglomerated portion can be preferably formed, and, for example, an antiglare film having more excellent antiglare properties and suppressed glare can be obtained. it can.

In the antiglare layer (B), the filler may be particles and a thixotropy imparting agent. The thixotropy-imparting agent may be contained alone, or in addition to the particles, the thixotropy-imparting agent may be further contained. By including the thixotropy-imparting agent, it is possible to easily control the aggregation state of the particles. Examples of the thixotropy imparting agent include organic clay, polyolefin oxide, and modified urea.

The organic clay is preferably an organically treated layered clay in order to improve the affinity with the resin. The organoclay may be prepared in-house or a commercially available product may be used. Examples of the commercially available products include Lucentite SAN, Lucentite STN, Lucentite SEN, Lucentite SPN, Someriff ME-100, Someriff MAE, Someriff MTE, Someriff MEE, Someriff MPE (trade names, all are Corp Chemical Co., Ltd. Manufactured); Sven, Sven C, Sven E, Sven W, Sven P, Sven WX, Sven N-400, Sven NX, Sven NX80, Sven NO12S, Sven NEZ, Sven NO12, Sven NE, Sven NZ, Sven NZ70, Olga Knight, Organite D, Organite T (trade name, all manufactured by Hojun Co., Ltd.); Kunipia F, Kunipia G, Kunipia G4 (trade name, all manufactured by Kunimine Industry Co., Ltd.); Thixogel VZ, Clayton HT, Clayton 40 (Product name, all made by Rockwood Additives).

The above-mentioned oxidized polyolefin may be prepared in-house or a commercially available product may be used. Examples of the commercially available products include Disparlon 4200-20 (trade name, manufactured by Kusumoto Kasei Co., Ltd.), Flownon SA300 (trade name, manufactured by Kyoeisha Chemical Co., Ltd.), and the like.

The modified urea is a reaction product of an isocyanate monomer or its adduct and an organic amine. The modified urea may be prepared in-house or a commercially available product may be used. Examples of the commercially available product include BYK410 (manufactured by Big Chemie).

The thixotropy-imparting agents may be used alone or in combination of two or more.

The proportion of the thixotropy imparting agent in the antiglare layer (B) is preferably 0.2 to 5 parts by weight, more preferably 0.4 to 4 parts by weight, based on 100 parts by weight of the resin. is there.

The maximum thickness (d ') of the antiglare layer (B) is not particularly limited, but is preferably in the range of 3 to 12 μm. By setting the maximum thickness (d ′) of the antiglare layer (B) within the above range, for example, it is possible to prevent the occurrence of curl in the antiglare film and reduce the productivity such as poor transportability. Can be avoided. When the thickness (d) is in the above range, the weight average particle diameter (D) of the particles is preferably in the range of 2 to 10 μm as described above. When the maximum thickness (d ′) of the antiglare layer (B) and the weight average particle diameter (D) of the particles are in the above combination, an antiglare film having excellent antiglare properties can be obtained. it can. The maximum thickness (d ') of the antiglare layer (B) is more preferably within the range of 3 to 8 μm.

The ratio D / d of the thickness (d ′) of the antiglare layer (B) and the weight average particle diameter (D) of the particles is, for example, 1 or less, 0.9 or less, 0.8 or less, 0.7. It may be less than or equal to or less than or equal to 0.6, and may be greater than or equal to 0.1, greater than or equal to 0.2, greater than or equal to 0.3, or greater than or equal to 0.4. The D / d is, for example, 0.1 or more and 1 or less, 0.2 or more and 1 or less, 0.3 or more and 1 or less, 0.4 or more and 1 or less, 0.1 or more and 0.9 or less, and 0.2 or more and 0. 0.9 or less, 0.3 or more and 0.9 or less, 0.4 or more and 0.9 or less, 0.1 or more and 0.8 or less, 0.2 or more and 0.8 or less, 0.3 or more and 0.8 or less, 0 0.4 to 0.8, 0.1 to 0.7, 0.2 to 0.7, 0.3 to 0.7, 0.4 to 0.7, 0.1 to 0. It may be 6 or less, 0.2 or more and 0.6 or less, 0.3 or more and 0.6 or less, or 0.4 or more and 0.6 or less. By having such a relationship, it is possible to obtain an antiglare film which is more excellent in the antiglare property and in which glare is suppressed.

In the antiglare film of the present invention, for example, the antiglare layer (B) has an aggregated portion that forms a convex portion on the surface of the antiglare layer (B) due to aggregation of the filler. However, in the agglomerated portion forming the convex portion, a plurality of the fillers may be present in a state gathered in one direction in the plane direction of the antiglare layer (B). Thereby, for example, the reflection of a fluorescent lamp can be prevented. However, the antiglare film of the present invention is not limited to this.

Further, the antiglare film of the present invention includes, for example, a resin derived from the light transmissive substrate (A) between the light transmissive substrate (A) and the antiglare layer (B), and It may have an intermediate layer containing a resin derived from the antiglare layer (B). By controlling the thickness of the intermediate layer, the surface shape of the antiglare layer (B) can be controlled. For example, if the thickness of the intermediate layer is increased, the Rz and θa are likely to be increased, and if the thickness of the intermediate layer is reduced, the Rz and θa are easily reduced.

In the present invention, the mechanism by which the intermediate layer (also referred to as a permeation layer or a compatible layer) is formed is not particularly limited, but, for example, it is formed in the drying step in the method for producing an antiglare film of the present inventor. .. Specifically, for example, in the drying step, the coating liquid for forming the antiglare layer (B) penetrates into the light transmissive base material (A), and is derived from the light transmissive base material (A). The intermediate layer containing a resin and a resin derived from the antiglare layer (B) is formed. The resin contained in the intermediate layer is not particularly limited, and for example, the resin contained in the light transmissive substrate (A) and the resin contained in the antiglare layer (B) are simply mixed (compatible). It may be a thing. Further, the resin contained in the intermediate layer is, for example, at least one of the resin contained in the light transmissive substrate (A) and the resin contained in the antiglare layer (B) is heating, light irradiation, or the like. It may be chemically changed by.

The thickness ratio R of the intermediate layer defined by the following formula (5) is not particularly limited, but is, for example, 0.10 to 0.80, and is, for example, 0.15 or more, 0.20 or more, 0.25. The above may be 0.30 or more, 0.40 or more, or 0.45 or more, and for example, 0.75 or less, 0.70 or less, 0.65 or less, 0.60 or less, 0.50 or less, It may be 0.40 or less, 0.45 or less, or 0.30 or less. The intermediate layer can be confirmed, for example, by observing the cross section of the antiglare hard coat film with a transmission electron microscope (TEM), and the thickness can be measured.

R = [D _C / (D _C + D _B )] (5)

In the formula (5), D _B is the thickness [μm] of the antiglare layer (B), and D _C is the thickness [μm] of the intermediate layer.

In the antiglare film of the present invention, for example, as described above, the antiglare layer (B) is aggregated to form a convex portion on the surface of the antiglare layer (B) due to the aggregation of the filler. The filler may be present in a state where a plurality of the fillers are gathered in one direction in the plane direction of the antiglare layer (B) in the aggregating portion forming the convex portion. As a result, the convex portion has a gentle shape having anisotropy. Since the antiglare film has the convex portion having such a shape, it is possible to prevent the reflection of a fluorescent lamp and the like. However, the antiglare film of the present invention is not limited to this.

The surface shape of the antiglare layer (B) can be arbitrarily designed by controlling the aggregation state of the filler contained in the material for forming the antiglare layer. The aggregated state of the filler can be controlled by, for example, the material of the filler (for example, the chemically modified state of the particle surface, the affinity for a solvent or a resin, etc.), the type of resin (binder) or solvent, the combination, and the like. Moreover, the aggregation state of the particles can be precisely controlled by the thixotropy imparting agent. As a result, in the present invention, the surface shape of the antiglare film can be controlled (adjusted) in a wide range, and for example, the aggregated state of the filler can be set as described above, and the convex shape can be obtained. The shaped portion can have a gentle shape. Further, as described above, the surface shape of the antiglare film is controlled (adjusted) in a wider range by adjusting the number of parts by weight of the particles with respect to 100 parts by weight of the resin in the antiglare layer forming material. You can also do it.

The anti-glare film of the present invention may be one in which the convex portion has a gentle shape and can prevent generation of protrusions on the surface of the anti-glare layer (B), which is a defect in appearance. It is not limited to this. In the antiglare film of the present invention, the particles may be present to some extent at a position where the antiglare layer (B) directly or indirectly overlaps in the thickness direction.

The other layer is not particularly limited and may be, for example, a low refractive index layer, a low reflective layer, a conductive layer, an antifouling layer, a high hardness layer, a high refractive index layer, a UV absorbing layer, etc., as described above. Good. Further, the other layer may be a single layer or a plurality of layers, and in the case of a plurality of layers, one kind or plural kinds may be used. For example, the other layer may be an optical thin film whose thickness and refractive index are strictly controlled, or a laminate of two or more optical thin films. The case where the other layer is the low reflection layer (C) will be described below.

For example, when an antiglare film is attached to an image display device, one of the factors that reduce the visibility of an image is the reflection of light at the interface between the air and the antiglare layer (B). The low reflection layer (C) can reduce the surface reflection. The antiglare layer (B) and the low reflection layer (C) may be formed on only one surface of the light transmissive substrate (A), or may be formed on both surfaces. Further, each of the antiglare layer (B) and the low reflection layer (C) may have a multi-layer structure in which two or more layers are laminated.

In the present invention, the low reflection layer (C) may be an optical thin film whose thickness and refractive index are strictly controlled, or a laminate of two or more layers of the optical thin films. The low reflection layer (C) exerts an antireflection function by canceling mutually reversed phases of incident light and reflected light by utilizing the interference effect of light. The wavelength range of visible light that exhibits an antireflection function is, for example, 380 to 780 nm, and the wavelength range of particularly high visibility is in the range of 450 to 650 nm, and the reflectance at 550 nm, which is the central wavelength, is minimized. The low reflection layer (C) may be designed as follows.

Further, for example, in order to prevent adhesion of contaminants and improve the ease of removing adhered contaminants, a contamination prevention layer formed of a silane compound containing a fluorine group or an organic compound containing a fluorine group is further added. It may be laminated on the low reflection layer (C).

[2. Manufacturing method of antiglare film]
The method for producing the antiglare film of the present invention is not particularly limited and may be produced by any method, but it is preferably produced by the method for producing the antiglare film of the present invention.

The method for producing the antiglare film can be performed, for example, as follows.

First, the antiglare layer (B) is formed on the light transmissive substrate (A) so as to satisfy the mathematical expressions (1) and (2) (antiglare layer (B) forming step). In this way, a laminate of the light transmissive substrate (A) and the antiglare layer (B) is manufactured. As described above, the antiglare layer (B) forming step includes a coating step of applying the coating solution onto the light-transmitting substrate (A), and a step of drying the applied coating solution to apply the coating solution. A coating film forming step of forming a film. Further, for example, as described above, the antiglare layer (B) forming step may further include a curing step of curing the coating film. The curing can be performed, for example, after the drying, but is not limited thereto. The curing can be performed, for example, by heating, light irradiation or the like. The light is not particularly limited, but may be, for example, ultraviolet light. The light source for the light irradiation is not particularly limited, but may be, for example, a high pressure mercury lamp or the like.

The coating liquid contains a resin and a solvent as described above. The coating liquid may be, for example, an antiglare layer forming material (coating liquid) containing the resin, the particles, the thixotropy imparting agent, and the solvent.

The coating liquid preferably exhibits thixotropy, and the Ti value defined by the following formula is preferably in the range of 1.3 to 3.5, more preferably 1.4 to 3. It is in the range of 2, and more preferably in the range of 1.5 to 3.

Ti value = β1 / β2

In the above formula, β1 is a viscosity measured under the condition of shear rate 20 (1 / s) using HAAKE RheoStress RS6000, and β2 is shear rate 200 (1 / s) using HAAKE Rheostress RS6000. The viscosity is measured under the conditions of.

When the Ti value is 1.3 or more, problems such as appearance defects and deterioration of antiglare properties and white blur characteristics are unlikely to occur. Further, when the Ti value is 3.5 or less, problems such as the particles being in a dispersed state without aggregating are unlikely to occur.

The coating liquid may or may not contain a thixotropy-imparting agent, but it is preferable to contain the thixotropy-imparting agent because the thixotropy is easily exhibited. In addition, as described above, the effect of preventing sedimentation of the particles (thixotropic effect) can be obtained because the coating liquid contains the thixotropy imparting agent. Furthermore, the surface shape of the antiglare film can be freely controlled in a wider range by shear aggregation of the thixotropy imparting agent itself. For example, when the coating liquid does not contain particles and contains a thixotropy-imparting agent, as described above, the θa and Rz are small, and thus the antiglare film of the present invention in which the unevenness of the outermost surface is gentle can be obtained. it can. Further, the coating liquid also contains a thixotropy-imparting agent and particles having a small particle size, and similarly, the θa and Rz are small, and the unevenness of the outermost surface is gentle, and the antiglare film of the present invention. can do.

The solvent is not particularly limited, various solvents can be used, and one kind may be used alone, or two or more kinds may be used in combination. In order to obtain the antiglare film of the present invention, the optimum solvent type and solvent ratio exist depending on the composition of the resin, the type and content of the particles and the thixotropy imparting agent. The solvent is not particularly limited, but examples thereof include alcohols such as methanol, ethanol, isopropyl alcohol, butanol, and 2-methoxyethanol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclopentanone; methyl acetate, ethyl acetate. , Esters such as butyl acetate; ethers such as diisopropyl ether and propylene glycol monomethyl ether; glycols such as ethylene glycol and propylene glycol; cellosolves such as ethyl cellosolve and butyl cellosolve; aliphatic hydrocarbons such as hexane, heptane, octane Examples: aromatic hydrocarbons such as benzene, toluene, xylene and the like. Further, for example, the solvent may include a hydrocarbon solvent and a ketone solvent. The hydrocarbon solvent may be, for example, an aromatic hydrocarbon. The aromatic hydrocarbon may be, for example, at least one selected from the group consisting of toluene, o-xylene, m-xylene, p-xylene, ethylbenzene, and benzene. The ketone solvent may be, for example, cyclopentanone, and at least one selected from the group consisting of acetone, methyl ethyl ketone, methyl isobutyl ketone, diethyl ketone, cyclohexanone, isophorone, and acetophenone. The solvent may be, for example, a solvent in which the hydrocarbon solvent and the ketone solvent are mixed in a mass ratio of 90:10 to 10:90. The mass ratio of the hydrocarbon solvent to the ketone solvent may be, for example, 80:20 to 20:80, 70:30 to 30:70, or 40:60 to 60:40. In this case, for example, the hydrocarbon solvent may be toluene and the ketone solvent may be methyl ethyl ketone.

When, for example, an acrylic film is used as the translucent substrate (A) to form the intermediate layer (penetration layer), a good solvent for the acrylic film (acrylic resin) can be preferably used. The solvent may be, for example, a solvent containing a hydrocarbon solvent and a ketone solvent as described above. The hydrocarbon solvent may be, for example, an aromatic hydrocarbon. The aromatic hydrocarbon may be, for example, at least one selected from the group consisting of toluene, o-xylene, m-xylene, p-xylene, ethylbenzene, and benzene. The ketone solvent may be at least one selected from the group consisting of cyclopentanone, acetone, methyl ethyl ketone, methyl isobutyl ketone, diethyl ketone, cyclohexanone, isophorone, and acetophenone. The solvent may be, for example, a solvent in which the hydrocarbon solvent and the ketone solvent are mixed in a mass ratio of 90:10 to 10:90. The mass ratio of the hydrocarbon solvent to the ketone solvent may be, for example, 80:20 to 20:80, 70:30 to 30:70, or 40:60 to 60:40. In this case, for example, the hydrocarbon solvent may be toluene and the ketone solvent may be methyl ethyl ketone.

When, for example, triacetyl cellulose (TAC) is used as the translucent base material (A) to form the intermediate layer (permeation layer), a good solvent for TAC can be preferably used. Examples of the solvent include ethyl acetate, methyl ethyl ketone, cyclopentanone and the like.

Further, by properly selecting the solvent, the thixotropy of the material for forming the antiglare layer (coating liquid) can be well exhibited when the thixotropy-imparting agent is contained. For example, when an organic clay is used, toluene and xylene can be preferably used alone or in combination. For example, when an oxidized polyolefin is used, methyl ethyl ketone, ethyl acetate, propylene glycol monomethyl ether is preferably used alone. They can be used or used together. For example, when a modified urea is used, butyl acetate and methyl isobutyl ketone are preferably used alone or in combination.

Various leveling agents may be added to the antiglare layer forming material. As the leveling agent, for example, a fluorine-based or silicone-based leveling agent can be used for the purpose of preventing coating unevenness (uniformizing the coated surface). In the present invention, when antifouling property is required on the surface of the antiglare layer (B), or as described later, a low reflection layer (low refractive index layer) or a layer containing an interlayer filler is on the antiglare layer (B). The leveling agent can be appropriately selected according to the case where the leveling agent is formed. In the present invention, for example, by containing the thixotropy-imparting agent, the coating liquid can be made to exhibit thixotropy, and thus coating unevenness is unlikely to occur. In this case, for example, there is an advantage that the choice of the leveling agent can be expanded.

The blending amount of the leveling agent is, for example, 5 parts by weight or less, preferably 0.01 to 5 parts by weight, based on 100 parts by weight of the resin.

To the antiglare layer forming material, if necessary, a pigment, a filler, a dispersant, a plasticizer, an ultraviolet absorber, a surfactant, an antifouling agent, an antioxidant, etc. are added within a range that does not impair the performance. May be done. These additives may be used alone or in combination of two or more.

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

Examples of the method for forming the coating film by coating the coating liquid on the light transmissive substrate (A) include, for example, a fan-ten coating method, a die coating method, a spin coating method, a spray coating method, and a gravure coating method. A coating method such as a roll coating method or a bar coating method can be used.

Next, as described above, the coating film is dried and cured to form the antiglare layer (B). The drying may be, for example, natural drying, air drying by blowing air, heat drying, or a combination thereof.

The drying temperature of the coating liquid for forming the antiglare layer (B) may be, for example, in the range of 30 to 200 ° C. The drying temperature may be, for example, 40 ° C or higher, 50 ° C or higher, 60 ° C or higher, 70 ° C or higher, 80 ° C or higher, 90 ° C or higher, or 100 ° C or higher, and 190 ° C or lower, 180 ° C or lower, 170. C. or lower, 160.degree. C. or lower, 150.degree. C. or lower, 140.degree. C. or lower, 135.degree. C. or lower, 130.degree. C. or lower, 120.degree. C. or lower, or 110.degree. C. or lower. The drying time is not particularly limited, but may be, for example, 30 seconds or more, 40 seconds or more, 50 seconds or more, or 60 seconds or more, and is 150 seconds or less, 130 seconds or less, 110 seconds or less, or 90 seconds or less. May be.

The means for curing the coating film is not particularly limited, but UV curing is preferred. The irradiation amount of the energy ray source is preferably 50 to 500 mJ / cm ² as an integrated exposure amount at an ultraviolet wavelength of 365 nm. When the irradiation amount is 50 mJ / cm ² or more, curing is likely to proceed sufficiently and the hardness of the antiglare layer (B) to be formed tends to be high. Further, when it is 500 mJ / cm ² or less, coloring of the formed antiglare layer (B) can be prevented.

As described above, a laminate of the light transmissive substrate (A) and the antiglare layer (B) can be manufactured. This laminate may be used as it is as the antiglare film of the present invention, or for example, the other layer may be formed on the antiglare layer (B) to give the antiglare film of the present invention. The method for forming the other layer is not particularly limited, and for example, it can be performed by a method similar to or similar to the method for forming a general low refractive index layer, low reflection layer, or the like. Hereinafter, the step of forming the low reflection layer (C) (low reflection layer forming step) when the other layer is the low reflection layer (C) will be described.

First, a low-reflection layer forming coating liquid for forming the low-reflection layer (C) is prepared. The low reflection layer forming coating liquid may contain, for example, a resin, a fluorine element-containing additive, hollow particles, solid particles, a diluting solvent, and the like, and can be produced by mixing these.

The above-mentioned resin includes, for example, a thermosetting resin and an ionizing radiation curable resin that is cured by ultraviolet rays or light. As the resin, it is also possible to use a commercially available thermosetting resin, ultraviolet curable resin, or the like.

For the resin, for example, a reactive diluent having at least one of an acrylate group and a methacrylate group can be used. As the reactive diluent, for example, the reactive diluent described in JP-A-2008-88309 can be used, and examples thereof include monofunctional acrylate, monofunctional methacrylate, polyfunctional acrylate, and polyfunctional methacrylate. As the reactive diluent, trifunctional or higher functional acrylate and trifunctional or higher functional methacrylate are preferable. This is because the hardness of the low reflection layer (C) can be made excellent. Examples of the reactive diluent also include butanediol glycerin ether diacrylate, acrylate of isocyanuric acid, and methacrylate of isocyanuric acid. These may be used alone or in combination of two or more. The resin may have a weight average molecular weight before curing of, for example, 100 or more, 300 or more, 500 or more, 1,000 or more, or 2,000 or more, 100,000 or less, 70,000 or less, 50 or less. It may be 2,000 or less, 30,000 or less, or 10,000 or less. If the weight average molecular weight before curing is high, the hardness is lowered, but cracks tend not to occur when bent. On the other hand, when the weight average molecular weight before curing is low, the intermolecular crosslink density tends to be improved and the hardness tends to be high.

For curing the curable resin, for example, a curing agent may be added. The curing agent is not particularly limited, and for example, a known polymerization initiator (for example, a thermal polymerization initiator, a photopolymerization initiator, etc.) can be appropriately used. The addition amount of the curing agent is not particularly limited, but is, for example, 0.5 parts by weight or more, 1.0 parts by weight or more, and 1.5 parts by weight with respect to 100 parts by weight of the resin in the coating liquid for forming the low reflection layer. It may be more than 2.0 parts by weight, more than 2.0 parts by weight, or more than 2.5 parts by weight, and not more than 15 parts by weight, 13 parts by weight or less, 10 parts by weight or less, 7 parts by weight or less, or 5 parts by weight or less. It may be.

The additive element containing fluorine element is not particularly limited, but may be, for example, an organic compound or an inorganic compound containing fluorine in the molecule. The organic compound is not particularly limited, and examples thereof include a fluorine-containing antifouling coating agent, a fluorine-containing acrylic compound, a fluorine- and silicon-containing acrylic compound, and the like. Specific examples of the organic compound include trade names "KY-1203" and "KY-100" manufactured by Shin-Etsu Chemical Co., Ltd. and trade names "Megafuck" manufactured by DIC Corporation. The inorganic compound is also not particularly limited. The addition amount of the elemental fluorine-containing additive is not particularly limited, for example, the weight of the elemental fluorine in the solid content, relative to the total weight of the solid content in the low reflection layer forming coating liquid, for example, May be 0.05 wt% or more, 0.1 wt% or more, 0.15 wt% or more, 0.20 wt% or more, or 0.25 wt% or more, 20 wt% or less, 15 wt% or less It may be 10% by weight or less, 5% by weight or less, or 3% by weight or less. Further, for example, the weight of the fluorine element-containing additive is, for example, 0.05% by weight or more, 0.1% by weight or more, 0% with respect to 100 parts by weight of the resin in the coating liquid for forming a low reflection layer. 15 wt% or more, 0.20 wt% or more, or 0.25 wt% or more, 20 wt% or less, 15 wt% or less, 10 wt% or less, 5 wt% or less, or 3 wt% It may be the following. From the viewpoint of scratch resistance of the low reflective layer (C), it is preferable that the addition amount of the fluorine element-containing additive is neither too large nor too small.

The hollow particles are not particularly limited, but may be, for example, silica particles, acrylic particles, acrylic-styrene copolymer particles, or the like. Examples of the silica particles include trade names "Thru rear 5320" and "Thru rear 4320" manufactured by JGC Catalysts & Chemicals Co., Ltd. The weight average particle diameter of the hollow particles is not particularly limited, but may be, for example, 30 nm or more, 40 nm or more, 50 nm or more, 60 nm or more, or 70 nm or more, 150 nm or less, 140 nm or less, 130 nm or less, 120 nm or less, Alternatively, it may be 110 nm or less. The shape of the hollow particles is not particularly limited, and may be, for example, a bead-shaped substantially spherical shape, or an irregular shape such as powder, but a substantially spherical shape is preferable, and more preferably, The particles are substantially spherical particles having an aspect ratio of 1.5 or less, and most preferably spherical particles. By adding the hollow particles, it is possible to realize, for example, a low refractive index of the low reflection layer (C) and good antireflection properties. The amount of the hollow particles to be added is not particularly limited, but is, for example, 30 parts by weight or more, 50 parts by weight or more, 70 parts by weight or more, 90 parts by weight with respect to 100 parts by weight of the resin in the coating liquid for forming the low reflection layer. Or more, or 100 parts by weight or more, 300 parts by weight or less, 270 parts by weight or less, 250 parts by weight or less, 200 parts by weight or less, or 180 parts by weight or less. From the viewpoint of reducing the refractive index of the low reflective layer (C), it is preferable that the amount of the hollow particles added is not too small, and from the viewpoint of ensuring the mechanical properties of the low reflective layer (C), the addition of the hollow particles is preferable. It is preferred that the amount is not too high.

The solid particles are not particularly limited, but may be, for example, silica particles, zirconium oxide particles, titanium-containing particles (for example, titanium oxide particles) and the like. Examples of the silica particles include trade names “MEK-2140Z-AC”, “MIBK-ST”, “IPA-ST” manufactured by Nissan Chemical Industries, Ltd. The weight average particle diameter of the solid particles is not particularly limited, but may be, for example, 5 nm or more, 10 nm or more, 15 nm or more, 20 nm or more, or 25 nm or more, 3300 nm or less, 250 nm or less, 200 nm or less, 150 nm or less. , Or 100 nm or less. The shape of the solid particles is not particularly limited, and may be, for example, a bead-like substantially spherical shape, or an irregular shape such as powder, but a substantially spherical shape is preferable, and more preferable. , Substantially spherical particles having an aspect ratio of 1.5 or less, and most preferably spherical particles. By adding the solid particles, for example, the fluorine element-containing additive is likely to be unevenly distributed on the surface of the coating liquid for forming the low reflection layer, and the low reflection layer (C) is scratch-resistant. Will be more likely. It is possible to realize a low refractive index of the low reflection layer (C), good antireflection properties, and the like. The addition amount of the solid particles is not particularly limited, but for example, 5 parts by weight or more, 10 parts by weight or more, 15 parts by weight or more, 20 parts by weight or more with respect to 100 parts by weight of the resin in the coating liquid for forming the low reflection layer. It may be more than or equal to 25 parts by weight, or more than or equal to 25 parts by weight, and may be less than or equal to 150 parts by weight, less than or equal to 120 parts by weight, less than or equal to 100 parts by weight, or less than or equal to 80 parts by weight. From the viewpoint of ensuring mechanical properties and adjusting the refractive index, it is preferable that the amount of the solid particles added is not too small, and from the viewpoint of preventing clouding of the coating film due to scattering, the amount of the solid particles added is not too large. It is preferable.

The diluent solvent is not particularly limited, various solvents can be used, and one kind may be used alone, or two or more kinds may be used in combination. Examples of the diluent solvent include alcohols such as methanol, ethanol, isopropyl alcohol, butanol, TBA (tertiary butyl alcohol), and 2-methoxyethanol; acetone, methyl ethyl ketone, MIBK (methyl isobutyl ketone), cyclopentanone, and the like. Ketones; methyl acetate, ethyl acetate, butyl acetate, PMA (propylene glycol monomethyl ether acetate), etc. esters; diisopropyl ether, propylene glycol monomethyl ether, etc. ethers; ethylene glycol, propylene glycol, etc. glycols; ethyl cellosolve, Examples thereof include cellosolves such as butyl cellosolve; aliphatic hydrocarbons such as hexane, heptane, and octane; aromatic hydrocarbons such as benzene, toluene, xylene, and the like. For example, the polarity of the diluent solvent may be adjusted by mixing a plurality of solvents at an arbitrary ratio.

The diluting solvent may be, for example, a mixed solvent containing MIBK (methyl isobutyl ketone) and PMA (propylene glycol monomethyl ether acetate). The mixing ratio in this case is not particularly limited, but when the weight of MIBK is 100% by weight, the weight of PMA is, for example, 20% by weight or more, 50% by weight or more, 100% by weight or more, 150% by weight or more, or It may be 200% by weight or more, 400% by weight or less, 350% by weight or less, 300% by weight or less, or 250% by weight or less.

The diluent solvent may be, for example, a mixed solvent containing TBA (tertiary butyl alcohol) in addition to MIBK and PMA. The mixing ratio in this case is not particularly limited, but when the weight of MIBK is 100% by weight, the weight of PMA is, for example, 10% by weight or more, 30% by weight or more, 50% by weight or more, 80% by weight or more, or It may be 100 wt% or more, 200 wt% or less, 180 wt% or less, 150 wt% or less, 130 wt% or less, or 110 wt% or less. When the weight of MIBK is 100% by weight, the weight of TBA may be, for example, 10% by weight or more, 30% by weight or more, 50% by weight or more, 80% by weight or more, or 100% by weight or more. , 200 wt% or less, 180 wt% or less, 150 wt% or less, 130 wt% or less, or 110 wt% or less.

The amount of the diluting solvent added is not particularly limited, but, for example, the weight of the solid content relative to the weight of the entire coating liquid for forming a low reflection layer is, for example, 0.1% by weight or more, 0.3% by weight or more, 0.1% by weight or more. 5% by weight or more, 1.0% by weight or more, or 1.5% by weight or more, 20% by weight or less, 15% by weight or less, 10% by weight or less, 5% by weight or less, or 3% by weight % Or less. From the viewpoint of ensuring coatability (wetness, leveling), it is preferable that the content of the solid content is not too high, and from the viewpoint of preventing appearance defects due to drying such as air drying unevenness and whitening, the content of the solid content. Is preferably not too low.

Next, the low reflection layer forming coating liquid is applied onto the antiglare layer (B) (the applying step). The coating method is not particularly limited, and for example, a known coating method such as a fan-ten coating method, a die coating method, a spin coating method, a spray coating method, a gravure coating method, a roll coating method, and a bar coating method may be appropriately used. it can. The coating amount of the coating liquid for forming the low reflection layer is not particularly limited, but the thickness of the low reflection layer (C) to be formed is, for example, 0.1 μm or more, 0.3 μm or more, 0.5 μm or more, The thickness may be 1.0 μm or more, or 2.0 μm or more, and may be 50 μm or less, 40 μm or less, 30 μm or less, 20 μm or less, or 10 μm or less.

Next, the applied coating liquid for forming the low reflection layer is dried to form a coating film (coating film forming step). The drying temperature is not particularly limited, but may be in the range of 30 to 200 ° C., for example. The drying temperature may be, for example, 40 ° C or higher, 50 ° C or higher, 60 ° C or higher, 70 ° C or higher, 80 ° C or higher, 90 ° C or higher, or 100 ° C or higher, and 190 ° C or lower, 180 ° C or lower, 170. C. or lower, 160.degree. C. or lower, 150.degree. C. or lower, 140.degree. C. or lower, 135.degree. C. or lower, 130.degree. C. or lower, 120.degree. C. or lower, or 110.degree. C. or lower. The drying time is not particularly limited, but may be, for example, 30 seconds or more, 40 seconds or more, 50 seconds or more, or 60 seconds or more, and is 150 seconds or less, 130 seconds or less, 110 seconds or less, or 90 seconds or less. May be.

Further, the coating film may be cured (curing step). The curing can be performed, for example, by heating, light irradiation or the like. The light is not particularly limited, but may be, for example, ultraviolet light. The light source for the light irradiation is not particularly limited, but may be, for example, a high pressure mercury lamp or the like. The irradiation amount of the energy ray source in the ultraviolet curing is preferably 50 to 500 mJ / cm ² as an integrated exposure amount at an ultraviolet wavelength of 365 nm. When the irradiation amount is 50 mJ / cm ² or more, curing is likely to proceed sufficiently and the low reflection layer (C) to be formed tends to have high hardness. Further, when it is 500 mJ / cm ² or less, coloring of the low reflection layer (C) formed can be prevented.

As described above, the antireflection of the present invention in which the antiglare layer (B) and the low reflection layer (C) are laminated in the order on at least one surface of the light transmissive substrate (A). A film can be produced. As described above, the antireflection film of the present invention may include a layer other than the light transmissive substrate (A), the antiglare layer (B) and the low reflection layer (C). ..

Also, in the process of producing the antireflection film of the present invention, it is preferable to perform a surface treatment on at least one of the light transmissive substrate (A) and the antiglare layer (B). By surface-treating the surface of the light transmissive substrate (A), the adhesion with the antiglare layer (B) or the polarizer or the polarizing plate is further improved. Further, when the surface of the antiglare layer (B) is surface-treated, the adhesion with the low reflection layer (C) is further improved.

[3. Optical member and image display device]
The optical member of the present invention is not particularly limited, but may be, for example, a polarizing plate. The polarizing plate is also not particularly limited, but may include, for example, the antiglare film and the polarizer of the present invention, and may further include other constituent elements. The respective constituent elements of the polarizing plate may be attached to each other with, for example, an adhesive or a pressure-sensitive adhesive.

The image display device of the present invention is not particularly limited, and any image display device may be used, and examples thereof include a liquid crystal display device and an organic EL display device.

The image display device of the present invention is, for example, an image display device having the antiglare film of the present invention on the viewing side surface, and the image display device may have a black matrix pattern.

In the antiglare film of the present invention, for example, the light transmissive substrate (A) side can be attached to an optical member used in an LCD via an adhesive or an adhesive. In addition, at the time of this bonding, the above-mentioned various surface treatments may be performed on the surface of the light transmissive substrate (A). As described above, according to the method for producing an antiglare film of the present invention, the surface shape of the antiglare film can be freely controlled in a wide range. Therefore, the optical properties that can be obtained by laminating the antiglare film with another optical member using an adhesive, a pressure sensitive adhesive, etc., cover a wide range corresponding to the surface shape of the antiglare film. ..

The examples of the optical member include a polarizer and a polarizing plate. The polarizing plate generally has a structure having a transparent protective film on one side or both sides of the polarizer. When the transparent protective films are provided on both sides of the polarizer, the transparent protective films on the front and back may be made of the same material or different materials. Polarizing plates are usually arranged on both sides of the liquid crystal cell. Further, the polarizing plates are arranged so that the absorption axes of the two polarizing plates are substantially orthogonal to each other.

The configuration of the polarizing plate laminated with the antiglare film is not particularly limited, for example, a configuration in which a transparent protective film, the polarizer and the transparent protective film are laminated in this order on the antiglare film. Alternatively, the polarizer and the transparent protective film may be laminated in this order on the antiglare film.

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

The image display device of the present invention is used for any appropriate purpose. Its applications are, for example, OA devices such as personal computer monitors, laptop computers, copiers, mobile phones, watches, digital cameras, personal digital assistants (PDAs), portable game devices such as portable game machines, video cameras, televisions, microwave ovens, etc. Household electric appliances, back monitors, car navigation system monitors, car audio and other in-vehicle equipment, commercial store information monitors and other exhibition equipment, surveillance monitors and other security equipment, nursing monitors, medical monitors, etc. Nursing care and medical equipment.

Next, examples of the present invention will be described together with comparative examples. However, the present invention is not limited by the following examples and comparative examples.

In the following examples and comparative examples, the number of parts of a substance is part by weight (part by weight) unless otherwise specified.

[Coating liquid 1: Antiglare layer forming material]
As a resin contained in the antiglare layer, 40 parts by weight of a urethane acrylate prepolymer (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name “UA-53H-80BK”, solid content 80%) and pentaerythritol triacrylate as main components 60 parts by weight of a polyfunctional acrylate (trade name "Viscoat # 300" manufactured by Osaka Organic Chemical Industry Co., Ltd., solid content 100%) was prepared. 1.2 parts by weight of a synthetic smectite (trade name “Lucentite SAN” manufactured by Coop Chemical Co., Ltd.), which is an organic clay as a thixotropy-imparting agent, per 100 parts by weight of the resin solid content of the resin, and a photopolymerization initiator (BASF) 5 parts by weight of trade name "Irgacure 907" manufactured by the same company and 0.15 parts by weight of a leveling agent (trade name "LE-303" manufactured by Kyoeisha Chemical Co., Ltd., solid content 40%) were mixed. The organic clay was diluted with toluene so that the solid content was 6% by weight. This mixture was diluted with a toluene / methyl ethyl ketone (MEK) mixed solvent (weight ratio 70/30) so that the solid content concentration was 40% by weight, and an antiglare layer forming material ( A coating liquid 1) was prepared.

[Coating liquid 2: Low reflective layer forming material]
As the resin contained in the low reflection layer, 100 parts by weight of a polyfunctional acrylate containing pentaerythritol triacrylate as a main component (manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name "Biscoat # 300", solid content 100%) was prepared. did. 30 parts by weight of organosilica sol (particle size: 10 to 15 nm), 100 parts by weight of hollow silica particles (weight average particle size: 75 nm), 100 parts by weight of resin solid content of the resin, photopolymerization initiator (manufactured by BASF, trade name: 10 parts by weight of Irgacure 907 "and" Irgacure 2959 ") and 10 parts by weight of a radical-reactive group-containing fluorine-based antifouling additive. This mixture was diluted with a methyl isobutyl ketone / propylene glycol monomethyl ether acetate mixed solvent (weight ratio 25/75) so that the solid content concentration was 1.5% by weight, and the mixture was diluted with an ultrasonic disperser to reduce the concentration. A reflective layer forming material (Coating liquid 2) was prepared.

[Coating liquid 3: Antiglare layer forming material]
The coating liquid 1 was diluted with a toluene / methyl ethyl ketone (MEK) mixed solvent (weight ratio 70/30) so that the solid content concentration was 42% by weight to prepare an antiglare layer forming material (coating liquid 3). ..

[Coating liquid 4: Antiglare layer forming material]
0.5 parts by weight of inorganic particles (Sekisui Plastics Co., Ltd., product name "Techpolymer SSX-103DXE" weight average particle diameter 3.0 μm) per 100 parts by weight of resin solid content were mixed with the coating liquid 1. , A mixture was obtained. The mixture was diluted with a toluene / methyl ethyl ketone (MEK) mixed solvent (weight ratio 70/30) so that the solid content concentration of the mixture was 42% by weight to prepare an antiglare layer forming material (coating liquid 4).

[Coating liquid 5: antiglare layer forming material]
The coating liquid 1 was diluted with a toluene / methyl ethyl ketone (MEK) mixed solvent (weight ratio 70/30) so that the solid content concentration was 38% by weight to prepare an antiglare layer forming material (coating liquid 3). ..

[Coating liquid 6: antiglare layer forming material]
0.5 part by weight of inorganic particles (Sekisui Plastics Co., Ltd., product name “Techpolymer SSX-103DXE”) was mixed with 100 parts by weight of the resin solid content to obtain a mixture. The mixture was diluted with a toluene / methyl ethyl ketone (MEK) mixed solvent (weight ratio 70/30) so that the solid content concentration of the mixture was 40% by weight to prepare an antiglare layer forming material (coating liquid 6).

[Coating liquid 7: antiglare layer forming material]
0.5 part by weight of inorganic particles (Sekisui Plastics Co., Ltd., product name “Techpolymer SSX-103DXE”) was mixed with 100 parts by weight of the resin solid content to obtain a mixture. The mixture was diluted with a toluene / methyl ethyl ketone (MEK) mixed solvent (weight ratio 70/30) so that the solid content concentration of the mixture was 38% by weight to prepare an antiglare layer forming material (coating liquid 6).

[Example 1]
The antiglare film was manufactured as follows.

As the translucent base material (A), a transparent plastic film base material (acrylic film, manufactured by Toyo Kohan Co., Ltd., trade name “HX-40UC”, thickness: 40 μm, refractive index: 1.50) was prepared. .. On one surface of the transparent plastic film substrate, the antiglare layer forming material (coating liquid 1) was applied using a wire bar to form a coating film (coating step). Then, the coating film was dried by heating at 100 ° C. for 1 minute (drying step). Then, the high pressure mercury lamp was used to irradiate ultraviolet rays having an integrated light intensity of 300 mJ / cm ² to cure the coating film to form an antiglare layer (B) having a thickness of 6.5 μm. The antiglare layer (B) in the antiglare film of this example is an antiglare hard coat layer. The same applies to all the following examples and comparative examples.

Further, the low reflection layer forming material (coating liquid 2) was applied onto the antiglare layer (B) using a spin coater to form a coating film (coating step). Then, the coating film was dried by heating at 90 ° C. for 1 minute (drying step). Then, ultraviolet rays having an integrated light intensity of 300 mJ / cm ² were irradiated with a high pressure mercury lamp to cure the coating film to form a low reflection layer (C) having a thickness of 100 nm to obtain an antiglare film of this example. It was

[Example 2]
An antiglare film was produced in the same manner as in Example 1 except that the coating liquid 3 was used instead of the coating liquid 1 as the antiglare layer forming material.

[Example 3]
An antiglare film was produced in the same manner as in Example 1 except that the coating liquid 4 was used in place of the coating liquid 1 as the antiglare layer forming material.

[Example 4]
An antiglare film was produced in the same manner as in Example 1 except that the coating liquid 5 was used instead of the coating liquid 1 as the material for forming the antiglare layer.

[Example 5]
An antiglare film was produced in the same manner as in Example 1 except that the thickness (film thickness) of the antiglare layer (B) was formed to 8.5 μm.

[Example 6]
Example 1 except that the coating liquid 6 was used in place of the coating liquid 1 as the material for forming the antiglare layer, and the thickness (film thickness) of the antiglare layer (B) was formed to 5.0 μm. An antiglare film was manufactured in the same manner.

[Example 7]
An antiglare film was produced in the same manner as in Example 1 except that the low reflection layer (C) was not formed on the antiglare layer (B).

[Comparative Example 1]
An antiglare film was produced in the same manner as in Example 1 except that the coating liquid 6 was used instead of the coating liquid 1 as the material for forming the antiglare layer.

[Comparative example 2]
Example 1 except that the coating liquid 6 was used in place of the coating liquid 1 as the material for forming the antiglare layer, and the thickness (film thickness) of the antiglare layer (B) was formed to 8.5 μm. An antiglare film was manufactured in the same manner.

[Comparative Example 3]
An antiglare film was produced in the same manner as in Example 1 except that the coating liquid 7 was used instead of the coating liquid 1 as the material for forming the antiglare layer.

[Comparative Example 4]
An antiglare film was produced in the same manner as in Comparative Example 1 except that the low reflection layer (C) was not formed on the antiglare layer (B).

Regarding the antiglare films of Examples 1 to 7 and Comparative Examples 1 to 4 produced as described above, the outermost surface (antiglare layer (B) surface or low surface) on the antiglare layer (B) side was prepared by the following method. The average inclination angle θa (°) of the unevenness of the reflection layer (C) surface), the ten-point average height Rz (μm), the arithmetic average surface roughness Ra (μm), and the average unevenness distance Sm (mm) are measured or Calculated.

[Measurement and calculation method of uneven shape]
According to JIS B0601 (1994 version), the average inter-concave distance Sm (mm), the ten-point average height Rz (μm), and the arithmetic average surface roughness Ra (μm) of the outermost surface of the antiglare film were measured. Specifically, first, a glass plate (manufactured by MATSUNAMI, MICRO SLIDE GLASS, product number S, thickness 1) is provided on the surface of the light transmissive substrate (A) of the antiglare film opposite to the antiglare layer (B). (3 mm, 45 × 50 mm) was attached with an adhesive to prepare a sample. Next, a stylus type surface roughness measuring instrument having a measuring needle with a radius of curvature R = 2 μm at the tip (diamond) (manufactured by Kosaka Laboratory Ltd., high precision fine shape measuring instrument, trade name “Surfcoder ET4000”) ), The outermost surface (antiglare layer (B) surface or low reflection layer (of the antiglare layer (B) in the sample, under the conditions of a scanning speed of 1 mm / sec, a cutoff value of 0.8 mm, and a measurement length of 12 mm). The uneven shape of (C) surface) was measured in a fixed direction. Based on the measurement, the average unevenness distance Sm (mm) on the outermost surface, the ten-point average height Rz, and the arithmetic average surface roughness Ra were calculated. Further, the average inclination angle θa (°) was calculated from the surface roughness curve obtained based on the measured value (calculated value). The high-precision fine shape measuring instrument automatically calculates each measured value.

Furthermore, with respect to the antiglare films of Examples 1 to 7 and Comparative Examples 1 to 4, suppression of occurrence of white smear was judged (evaluated) by the following method.

[White haze determination method]
(1) A black acrylic plate (manufactured by Mitsubishi Rayon Co., Ltd., thickness 2.0 mm) is used as an adhesive on the surface of the light transmissive substrate (A) of the antiglare film on which the antiglare layer (B) is not formed. Then, the sample was pasted together to produce a sample without reflection on the back surface.
(2) Generally, in an office environment (about 1000 Lx) using a display, the sample was illuminated with a fluorescent lamp (three-wavelength light source), and white smear of the sample was visually determined according to the following criteria.

Judgment criteria OK: The wavy color difference between black and white is not visible, or the color difference is so small that there is no practical problem.
NG: The wavy color difference between black and white is visible.

The uneven shape of the outermost surface of the antiglare films of Examples 1 to 7 and Comparative Examples 1 to 4 and the result of white haze determination are summarized in Table 1 below.

As shown in Table 1, the anti-glare films of Examples 1 to 7 satisfying θa ≦ 0.24 and Rz ≦ 0.20 had suppressed white smear. On the other hand, in the antiglare films of Comparative Examples 1 to 4, which did not satisfy both θa ≦ 0.24 and Rz ≦ 0.20, the white smear was insufficiently suppressed. As for the anti-glare property, all of the anti-glare films of Examples 1 to 7 were able to prevent the image of the outline of the fluorescent lamp from being reflected under the conditions of the white smear determination method. There was no level.

As described above, according to the present invention, it is possible to provide an antiglare film in which generation of white haze is suppressed, a method for producing an antiglare film, an optical member, and an image display device. The application of the present invention is not particularly limited and can be used in a wide range of applications, for example, it can be applied to any image display device.

This application claims the priority right based on Japanese Patent Application No. 2018-213945 filed on Nov. 14, 2018, and incorporates all the disclosure thereof.

10 Anti-glare film 11 Light-transmissive substrate (A)
12 Antiglare layer (B)

12a Resin layer 12b Particles

12c Thixotropic agent 13 Low reflection layer (C) (other layer)

Claims

An antiglare film having an antiglare layer (B) laminated on a light transmissive substrate (A),
Unevenness is formed on the outermost surface of the antiglare film on the antiglare layer (B) side,
The anti-glare film, wherein the irregularities satisfy the following mathematical formulas (1) and (2).

θa ≦ 0.24 (1)
Rz ≦ 0.20 (2)

In the formula (1), θa is the average inclination angle [°] of the unevenness,
In the formula (2), Rz is the ten-point average height [μm] of the irregularities.
Further, the antiglare film according to claim 1, which satisfies the following mathematical formula (3).

Ra ≦ 0.050 (3)

In the mathematical expression (3), Ra is the arithmetic average surface roughness [μm] of the irregularities.
The antiglare film according to claim 1 or 2, wherein another layer is further laminated on the surface of the antiglare layer (B) opposite to the light transmissive substrate (A).
An antiglare film in which an antiglare layer (B) and other layers are laminated on the light transmissive substrate (A) in the above order,
Unevenness is formed on the outermost surface of the other layer,
The anti-glare film, wherein the irregularities satisfy the following mathematical formulas (1) and (2).

θa ≦ 0.24 (1)
Rz ≦ 0.20 (2)

In the formula (1), θa is the average inclination angle [°] of the unevenness,
In the formula (2), Rz is the ten-point average height [μm] of the irregularities.
The antiglare film according to claim 3 or 4, wherein the other layer is a low reflection layer (C).
The antiglare film according to any one of claims 1 to 5, wherein the antiglare layer (B) contains a binder resin and a cohesive filler.
The antiglare film according to claim 6, wherein the cohesive filler is an organic clay.
The antiglare film according to any one of claims 1 to 7, wherein the antiglare layer (B) does not contain particles.
An antiglare layer (B) forming step of forming the antiglare layer (B) on the light transmissive substrate (A);
An unevenness forming step of forming the unevenness on the outermost surface of the antiglare film on the antiglare layer (B) side so as to satisfy the mathematical formulas (1) and (2),
In the antiglare layer (B) forming step, a coating step of applying a coating solution onto the light transmissive base material (A) and drying the applied coating solution to form a coating film. Including a coating film forming step,
The method for producing an antiglare film according to any one of claims 1 to 8, wherein the coating liquid contains a resin and a solvent.
The manufacturing method according to claim 9, wherein the step of forming the antiglare layer (B) further includes a curing step of curing the coating film.
11. The method according to claim 9 or 10, wherein the solvent contains toluene and methyl ethyl ketone.
The antiglare film is the antiglare film according to any one of claims 3 to 5,
The manufacturing method according to any one of claims 9 to 11, wherein the unevenness forming step includes another layer forming step of forming the other layer on the antiglare layer (B).
An optical member comprising the antiglare film according to any one of claims 1 to 8.
The optical member according to claim 13, which is a polarizing plate.
An image display device comprising the antiglare film according to any one of claims 1 to 8 or the optical member according to claim 13 or 14.