[go: up one dir, main page]

WO2025229974A1 - Film de diffusion de lumière anisotrope, film pour affichage l'utilisant, et dispositif d'affichage - Google Patents

Film de diffusion de lumière anisotrope, film pour affichage l'utilisant, et dispositif d'affichage

Info

Publication number
WO2025229974A1
WO2025229974A1 PCT/JP2025/016324 JP2025016324W WO2025229974A1 WO 2025229974 A1 WO2025229974 A1 WO 2025229974A1 JP 2025016324 W JP2025016324 W JP 2025016324W WO 2025229974 A1 WO2025229974 A1 WO 2025229974A1
Authority
WO
WIPO (PCT)
Prior art keywords
anisotropic light
light
diffusing
layer
film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2025/016324
Other languages
English (en)
Japanese (ja)
Inventor
仁英 杉山
翼 坂野
純弥 荒島
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tomoegawa Corp
Original Assignee
Tomoegawa Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tomoegawa Corp filed Critical Tomoegawa Corp
Publication of WO2025229974A1 publication Critical patent/WO2025229974A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements

Definitions

  • the present invention relates to an anisotropic light-diffusing film, and a display film and a display using the same.
  • Anisotropic light diffusion film is an effective light diffusion film in the display field for improving viewing angles, brightness, and image quality, and is also used as window film, where it is an effective film for maintaining transparent screens and privacy.
  • Patent Document 1 discloses an anti-glare film that combines an anti-glare layer with an anisotropic light-diffusing layer to eliminate scintillation while also reducing the decline in contrast.
  • anisotropic light-diffusing films have been recent talk of expanding the use of anisotropic light-diffusing films to curved displays or windows.
  • the performance requirement for anisotropic light-diffusing films is that they do not develop abnormalities such as cracks or wrinkles, even when used in a curved state in low- to high-temperature environments.
  • Patent Document 2 proposes a light diffusion control film that specifies the relationship between the storage modulus and loss modulus in order to improve flexibility at 5°C.
  • the present invention provides an anisotropic light-diffusing film that does not develop defects such as cracks or wrinkles even when used at temperatures between -15°C and 60°C in displays that require bending or in curved windows, as well as a display film and display that use the same.
  • An anisotropic light-diffusing film having an anisotropic light-diffusing layer formed by photopolymerization of a composition containing a photopolymerizable compound, a photopolymerization initiator, and at least one plasticizer selected from the group consisting of an ester-based, an epoxy-based, and a liquid rubber-based plasticizer, wherein the anisotropic light-diffusing layer has a matrix region and a columnar region composed of a plurality of columnar structures having a refractive index different from that of the matrix region.
  • a film for displays comprising the anisotropic light-diffusing film according to any one of [1] to [11], and an antiglare layer on the viewing side of the anisotropic light-diffusing layer.
  • the antiglare layer has an arithmetic mean roughness of 0.05 ⁇ m to 1.00 ⁇ m.
  • a display comprising the film for a display according to [12] or [13], with the antiglare layer positioned on the most visible side.
  • the present invention provides an anisotropic light-diffusing film that does not develop defects such as cracks or wrinkles even when used at temperatures between -15°C and 60°C in displays that require bending or in curved windows, as well as a display film and a display using the film.
  • FIG. 1 is a schematic cross-sectional view showing one embodiment of an anisotropic light-diffusing film of the present invention.
  • 1 is a schematic cross-sectional view showing one embodiment of a display film of the present invention.
  • FIG. 2 is a schematic cross-sectional view showing another example of the display film of the present invention.
  • FIG. 2 is a schematic cross-sectional view showing another example of the display film of the present invention.
  • FIG. 1 is a schematic diagram showing a first example of a method for producing an anisotropic light-diffusing film according to the present invention, including optional steps 1-3.
  • FIG. 2 is a schematic diagram showing a second example of the method for producing an anisotropic light-diffusing film according to the present invention, including optional steps 1-3.
  • FIG. 2 is an explanatory diagram showing a method for evaluating the in-line transmittance of an anisotropic light-diffusing layer.
  • An “anisotropic light diffusion layer” is a light diffusion layer that is incident light angle dependent and whose diffusion properties change depending on the angle of incident light. In other words, it is a light diffusion layer whose linear transmittance changes depending on the angle of incident light.
  • anisotropic light-diffusing film is a film primarily composed of an anisotropic light-diffusing layer, and may have other layers (e.g., an adhesive layer, a functional layer, a transparent film layer, etc.) in addition to the anisotropic light-diffusing layer. It may also be a single layer consisting of an anisotropic light-diffusing layer.
  • Linear transmittance is the ratio of the amount of light transmitted in a linear direction (linear transmitted light amount) to the amount of incident light (incident light amount) when light is incident on an anisotropic light-diffusing film (anisotropic light-diffusing layer) at a certain incident light angle, and is expressed by the following formula.
  • the linear direction refers to the direction in which the incident light travels.
  • the linear transmitted light amount can be measured by the method described in paragraph 0157 of JP 2015-191178 A or in the examples of this specification.
  • Linear transmittance (%) (linear transmitted light amount / incident light amount) x 100
  • Maximum linear transmittance is the linear transmittance of light incident at the angle of incidence at which linear transmittance is at its maximum.
  • Minimum linear transmittance is the linear transmittance of light incident at the angle of incidence at which linear transmittance is minimum.
  • the "central scattering axis" means the direction that coincides with the angle of incident light of light whose light diffusion properties are approximately symmetrical across the angle of incident light when the angle of incident light to the anisotropic light diffusion layer is changed.
  • the reason for the term “substantially symmetric” is that when the central scattering axis is inclined with respect to the normal direction of the anisotropic light-diffusing layer, the optical characteristics (the “optical profile” described below) do not strictly have symmetry.
  • the central scattering axis can be confirmed from the incident light angle in the optical profile, which is substantially symmetric.
  • Optical profile refers to a curve obtained by graphing the linear transmittance values when the angle of incident light is changed for an anisotropic light diffusion layer. Although the optical profile does not directly express light diffusion, if we interpret it as meaning that a decrease in linear transmittance conversely increases diffuse transmittance, it can be said that it generally indicates the incidence angle dependency of light diffusion. The angle of incident light at the approximate center between the minimum values in the optical profile is the scattering central axis angle.
  • photopolymerization and “photocuring” refer to the polymerization reaction of a photopolymerizable compound caused by light.
  • (Meth)acrylate means that it can be either an acrylate or a methacrylate.
  • FIG. 1 is a schematic cross-sectional view showing an example of an anisotropic light-diffusing film 3 according to one embodiment of the present invention.
  • FIG. 2 is a schematic cross-sectional view showing an example of a display film 10 according to one embodiment of the present invention.
  • the anisotropic light-diffusing film 3 of this embodiment can be used not only for the display film 10 but also for curved windows and the like.
  • the present invention provides an anisotropic light-diffusing film 3 that does not develop defects such as cracks or wrinkles even when used at temperatures between ⁇ 15° C. and 60° C. in displays that require bending, curved windows, etc.
  • the anisotropic light-diffusing layer 30 contains at least one plasticizer selected from ester-based, epoxy-based, and liquid rubber-based plasticizers.
  • the display film 10 of this embodiment includes an antiglare layer 1 and an anisotropic light-diffusing film 3.
  • the antiglare layer 1 is disposed on the viewing side of the anisotropic light-diffusing layer in the anisotropic light-diffusing film 3.
  • the display film 10 further includes a translucent substrate 5 and a transparent adhesive layer 7 between the antiglare layer 1 and the anisotropic light-diffusing film 3.
  • the first surface 1a of the antiglare layer 1 is an uneven surface.
  • a light-transmitting substrate 5, a transparent adhesive layer 7, and an anisotropic light-diffusing film 3 are sequentially laminated on a second surface 1b of the antiglare layer 1 opposite to the first surface 1a.
  • the film for display 10 is typically formed by laminating an antiglare layer laminate 9 in which the antiglare layer 1 is formed on one surface of the light-transmitting substrate 5, and the anisotropic light-diffusing film 3 via the transparent adhesive layer 7.
  • the configuration of the display film of the present invention is not limited to this configuration.
  • (Anisotropic Light Diffusing Layer) 1 is a schematic cross-sectional view showing an example of an anisotropic light-diffusing film 3 according to one embodiment of the present invention, which is composed of a single anisotropic light-diffusing layer 30.
  • the anisotropic light-diffusing film 3 may be composed of only the anisotropic light-diffusing layer 30, or may have layers other than the anisotropic light-diffusing layer 30 (for example, an adhesive layer, a functional layer, a transparent film layer, etc.).
  • the anisotropic light-diffusing layer 30 has a matrix region 31 and a columnar region 32 made up of a plurality of columnar structures 33 having a refractive index different from that of the matrix region 31.
  • Each of the plurality of columnar structures 33 extends from one surface side of the anisotropic light-diffusing layer 30 to the other surface side.
  • One end of the columnar structure 33 reaches one surface of the anisotropic light-diffusing layer 30.
  • the other end of the columnar structure 33 may or may not reach the other surface of the anisotropic light-diffusing layer 30. Neither end of the columnar structure 33 may reach the surface of the anisotropic light-diffusing layer 30.
  • the extending direction of the columnar structures 33 coincides with the thickness direction (normal direction) of the anisotropic light-diffusing layer 30.
  • the anisotropic light-diffusing layer 30 is not limited to this, and may be inclined with respect to the thickness direction of the anisotropic light-diffusing layer 30.
  • the refractive index of the matrix region 31 may be different from the refractive index of the columnar structures 33, but the extent of the difference is not particularly limited and is relative. If the refractive index of the matrix region 31 is lower than that of the columnar structures 33, the matrix region 31 becomes a low refractive index region. Conversely, if the refractive index of the matrix region 31 is higher than that of the columnar structures 33, the matrix region 31 becomes a high refractive index region.
  • the average height H of the columnar structures 33 in the thickness direction of the anisotropic light-diffusing layer 30 is 80% or more, preferably 90% or more, and more preferably 95% or more of the thickness T of the anisotropic light-diffusing layer 30.
  • the ratio of the average height H to the thickness T is equal to or greater than the above-mentioned lower limit, the front contrast is less likely to decrease.
  • the ratio of the average height H to the thickness T is equal to or greater than the lower limit, the interface between the matrix region 31 and the columnar structures 33 exists continuously and without interruption over a certain range or more in the thickness direction of the anisotropic light-diffusing layer 30, so that light incident from an oblique direction relative to the scattering center axis of the anisotropic light-diffusing layer 30 is less likely to be scattered.
  • the upper limit of the average height H relative to the thickness T is not particularly limited, but is preferably 100%.
  • the average height H of the columnar structures 33 can be determined by measuring the heights of 20 columnar structures 33 using an optical microscope and taking the average of these measurements.
  • the height of the columnar structures 33 refers to the height from the bottom to the top of the columnar structures 33 when the anisotropic light-diffusing layer 30 is placed horizontally with one surface of the anisotropic light-diffusing layer 30 facing downward and the other surface facing upward.
  • cross-sectional shape perpendicular to the extension direction of the columnar structure 33 there are no particular restrictions on the cross-sectional shape perpendicular to the extension direction of the columnar structure 33.
  • it may be circular, elliptical, polygonal, irregular, or a mixture of these.
  • the length is expressed using the minor axis, major axis, or diameter. If the cross-sectional shape is circular, the diameter of the circle is referred to as the diameter, not the minor axis and major axis. If the cross-sectional shape is elliptical, the length of the minor axis is referred to as the minor axis, and the length of the major axis is referred to as the major axis. If the cross-sectional shape is polygonal or irregular, the length between the shortest two points on the outline of these shapes is referred to as the minor axis, and the length between the longest two points is referred to as the major axis.
  • the aspect ratio (LA/SA) expressed as the ratio of LA to SA may be less than 2, more preferably less than 1.5, and even more preferably less than 1.2, in the case of a pillar structure in which the columnar structures are rod-shaped.
  • the lower limit of the aspect ratio is 1.
  • LA and SA may have the same value.
  • An aspect ratio of less than 2 provides a better effect of suppressing a decrease in front contrast.
  • the aspect ratio may be 2-40.
  • the length of LA is at least equal to or greater than the length of SA, and is preferably equal to or greater than 0.5 ⁇ m, more preferably equal to or greater than 1.0 ⁇ m, and even more preferably equal to or greater than 1.5 ⁇ m.
  • LA is preferably 8.0 ⁇ m or less, more preferably 3.0 ⁇ m or less, and even more preferably 2.5 ⁇ m or less.
  • the diffusion range can be widened, and the change in diffusivity when the angle of incident light is changed becomes more gradual, which tends to further suppress the occurrence of scintillation and optical interference.
  • the length of SA is at least equal to or shorter than the length of LA, and is preferably 0.5 ⁇ m or more, more preferably 1.0 ⁇ m or more, and even more preferably 1.5 ⁇ m or more.
  • the SA is preferably 5.0 ⁇ m or less, more preferably 3.0 ⁇ m or less, and even more preferably 2.5 ⁇ m or less.
  • the minor axis SA is equal to or less than the above value, the diffusion range tends to be wider.
  • the cross-sectional shape of the columnar structures 33 perpendicular to the extending direction can be confirmed by observing the surface of the anisotropic light-diffusing layer 30 with an optical microscope.
  • LA and SA can be determined by observing the surface of the anisotropic light-diffusing layer 30 with an optical microscope, measuring the long axis, short axis, or diameter of the cross-sectional shape of 20 arbitrarily selected columnar structures 33, and taking the average value of each.
  • the aspect ratio is calculated by dividing the LA calculated above by the SA.
  • the anisotropic light-diffusing layer 30 has a central scattering axis.
  • the central scattering axis can be defined for each columnar region 32.
  • multiple columnar structures 33 are distributed throughout the anisotropic light-diffusing layer 30, it is also possible to define a single central scattering axis for the entire anisotropic light-diffusing layer 30.
  • each of the plurality of columnar structures 33 is formed so that the extending direction of the columnar structure 33 and the scattering central axis of the columnar region 32 are parallel to each other.
  • the extension direction of the columnar structures 33 and the scattering central axis of the columnar region 32 being parallel to each other only needs to satisfy the law of refractive index (Snell's law), and do not need to be strictly parallel.
  • the anisotropic light-diffusing layer 30 Light that enters the anisotropic light-diffusing layer 30 at a predetermined incident light angle is preferentially diffused if the incident light angle is approximately parallel to the extension direction (orientation direction) of the columnar structures 33, and is preferentially transmitted if the incident light angle is not approximately parallel to the extension direction. Therefore, when the angle of light incident on the anisotropic light-diffusing layer 30 changes, the linear transmittance also changes. Specifically, in the anisotropic light-diffusing layer 30, incident light is strongly diffused within the incident light angle range close to the extension direction of the columnar structures 33 (diffusion region), but diffusion is weakened and linear transmittance increases outside of this incident light angle range (non-diffusion region).
  • the scattering central axis angle of the anisotropic light-diffusing layer 30 is preferably -45° to +45°, more preferably -40° to +40°, and even more preferably -35° to +35°.
  • the scattering central axis angle is the polar angle ⁇ formed between the normal to the anisotropic light-diffusing layer 30 and the scattering central axis. If the scattering central axis angle is within the above range, better contrast will be achieved.
  • the positive and negative angles of the scattering central axis are defined as positive (+) when the scattering central axis is tilted to one side with respect to a plane passing through both a predetermined axis of symmetry in the plane direction of the anisotropic light diffusion layer 30 and the normal direction of the anisotropic light diffusion layer 30, and as negative (-) when it is tilted to the other side.
  • the predetermined axis of symmetry is, for example, the MD (Machine Direction) passing through the center of gravity of the anisotropic light-diffusing layer 30.
  • the MD is the coating direction in producing the anisotropic light-diffusing layer.
  • the scattering central axis angle ie, the polar angle ⁇
  • the scattering central axis angle can be adjusted to the desired angle by changing the direction of the light irradiated onto the sheet-shaped photocurable resin composition layer (composition layer for anisotropic light-diffusing film) when manufacturing the anisotropic light-diffusing layer 30.
  • the anisotropic light-diffusing film 3 preferably has a linear transmittance of 1% or more and less than 20% at an incident light angle of 0°, a linear transmittance of 1% or more and less than 20% at an incident light angle of 15°, and more preferably a linear transmittance of 30% or more and less than 80% at an incident light angle of 45°.
  • the linear transmittance of the anisotropic light-diffusing film 3 within the above range (preferably satisfying the numerical ranges for the two linear transmittances at incident light angles of 0° and 15°, and more preferably satisfying the numerical ranges for the three linear transmittances at incident light angles of 0°, 15°, and 45°), the anti-scintillation performance and contrast are improved.
  • the present invention provides an anisotropic light-diffusing film 3 that does not develop defects such as cracks or wrinkles even when used at temperatures between ⁇ 15° C. and 60° C. in displays that require bending, curved windows, etc. Therefore, it is preferable that the loss tangent of the anisotropic light-diffusing layer 30 at temperatures between ⁇ 15° C. and 60° C. is 0.07 to 0.8. By setting the loss tangent within the above range, the anisotropic light-diffusing film 3 tends to be further prevented from developing abnormalities such as cracks and wrinkles, even when used at temperatures from -15°C to 60°C in a display that requires bending or a curved window.
  • Loss tangent (tan ⁇ ), along with storage modulus (E') and loss modulus (E"), can be measured by dynamic mechanical analysis (DMA).
  • the storage modulus and loss modulus of the anisotropic light-diffusing layer 30 at temperatures from ⁇ 15° C. to 60° C. may be in the following ranges, for example.
  • the anisotropic light-diffusing layer 30 preferably has a storage modulus of 1.0 ⁇ 10 7 Pa to 2.0 ⁇ 10 9 Pa and a loss modulus of 1.0 ⁇ 10 7 Pa to 2.0 ⁇ 10 9 Pa at -15°C.
  • the anisotropic light-diffusing layer 30 preferably has a storage modulus of 1.0 ⁇ 10 7 Pa to 2.0 ⁇ 10 9 Pa and a loss modulus of 1.0 ⁇ 10 7 Pa to 2.0 ⁇ 10 9 Pa at 25°C.
  • the anisotropic light-diffusing layer 30 preferably has a storage modulus of 1.0 ⁇ 10 6 Pa to 2.0 ⁇ 10 8 Pa and a loss modulus of 1.0 ⁇ 10 6 Pa to 2.0 ⁇ 10 8 Pa at 60°C.
  • the storage modulus of the anisotropic light-diffusing layer 30 By setting the storage modulus of the anisotropic light-diffusing layer 30 within the above range, the occurrence of cracks in the anisotropic light-diffusing film 3 tends to be further suppressed, even when used at temperatures between -15°C and 60°C in displays that require bending or in curved windows, etc. Furthermore, by setting the loss modulus of the anisotropic light-diffusing layer 30 within the above range, the occurrence of wrinkles in the anisotropic light-diffusing film 3 tends to be further suppressed, even when used at temperatures between -15°C and 60°C in displays that require bending or in curved windows, etc.
  • the lowest temperature peak temperature of the loss tangent of the anisotropic light-diffusing layer 30 is preferably 0° C. or lower, more preferably ⁇ 10° C. or lower, and even more preferably ⁇ 30° C. or lower.
  • the anisotropic light-diffusing layer 30 is typically made of a cured product of a composition containing a photopolymerizable compound. When this composition layer is cured, regions with different refractive indices are formed. Compositions containing photopolymerizable compounds will be described in more detail later.
  • the thickness of the anisotropic light-diffusing film 3 is preferably 10 ⁇ m to 60 ⁇ m. If the thickness is equal to or greater than the lower limit, the anisotropic light-diffusing film 3 is less likely to tear. If the thickness is equal to or less than the upper limit, the anisotropic light-diffusing film 3 is more likely to bend.
  • the thickness is measured, for example, by a method including the following steps (1) to (3). (1) A cross section of the film is formed using a microtome, and this cross section is observed under an optical microscope. (2) On the cross section, the length between the surface of the film and the surface on the opposite side thereof in the direction perpendicular to the film plane (thickness direction) is measured at 10 points. (3) The average value of the measurements obtained at the 10 locations is taken as the thickness of the anisotropic light-diffusing film 3 .
  • the antiglare layer 1 may be any layer having a first surface 1a that is an uneven surface, and may be appropriately selected from known antiglare layers.
  • the antiglare layer 1 may be, for example, a layer containing a transparent resin.
  • the total light transmittance (JIS K 7361-1:1997) of the transparent resin is preferably 80% or more, and more preferably 90% or more.
  • the transparent resin include thermoplastic resins and cured products of curable resins, etc.
  • the curable resin include thermosetting resins and photocurable resins.
  • thermoplastic resins used as the transparent resin of the anti-glare layer 1 include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polymethyl methacrylate (PMMA), polycarbonate (PC), polyethylene (PE), polypropylene (PP), polyvinyl alcohol (PVA), polyvinyl chloride (PVC), cycloolefin copolymer (COC), norbornene-containing resin, polyethersulfone, etc.
  • Thermosetting resins used as the transparent resin in the anti-glare layer 1 include phenolic resin, furan resin, xylene-formaldehyde resin, ketone-formaldehyde resin, urea resin, melamine resin, aniline resin, alkyd resin, unsaturated polyester resin, and epoxy resin. These may be used alone or in combination.
  • the photocurable resin used as the transparent resin in the antiglare layer 1 may be, for example, a monomer, oligomer, or prepolymer having a radically polymerizable functional group such as an acryloyl group, methacryloyl group, acryloyloxy group, or methacryloyloxy group, or a cationically polymerizable functional group such as an epoxy group, vinyl ether group, or oxetane group, either alone or in a suitable mixture of two or more types.
  • a radically polymerizable functional group such as an acryloyl group, methacryloyl group, acryloyloxy group, or methacryloyloxy group
  • a cationically polymerizable functional group such as an epoxy group, vinyl ether group, or oxetane group
  • photocurable resin monomers examples include methyl acrylate, methyl methacrylate, methoxypolyethylene methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, ethylene glycol dimethacrylate, didipentaerythritol hexaacrylate, trimethylolpropane trimethacrylate, and urethane acrylate. These can be used alone or in combination.
  • Photocurable resin oligomers and prepolymers include acrylate compounds such as polyester acrylate, polyurethane acrylate, multifunctional urethane acrylate, epoxy acrylate, polyether acrylate, alkyd acrylate, melamine acrylate, and silicone acrylate; unsaturated polyester; epoxy compounds such as tetramethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, bisphenol A diglycidyl ether, and various alicyclic epoxies; and oxetane compounds such as 3-ethyl-3-hydroxymethyloxetane, 1,4-bis ⁇ [(3-ethyl-3-oxetanyl)methoxy]methyl ⁇ benzene, and di[1-ethyl(3-oxetanyl)]methyl ether. These can be used alone or in combination.
  • a photopolymerization initiator is blended into the photocurable resin, and the photocurable resin is used as a photocurable resin composition containing the photopolymerization initiator and the photocurable resin.
  • the light used for photocuring may be ultraviolet light, visible light, or infrared light, and may be polarized or unpolarized.
  • radical polymerization initiators such as acetophenones, benzophenones, thioxanthones, benzoin, and benzoin methyl ether
  • cationic polymerization initiators such as aromatic diazonium salts, aromatic sulfonium salts, aromatic iodonium salts, and metallocene compounds can be used alone or in appropriate combinations.
  • the photocurable resin composition may further contain a polymer resin, provided that the polymeric curing of the photocurable resin is not hindered.
  • This polymer resin is typically a thermoplastic resin, and specific examples include acrylic resin, alkyd resin, and polyester resin. These resins preferably have acidic functional groups such as carboxyl groups, phosphate groups, and sulfonic acid groups.
  • a paint containing the photocurable resin composition and an organic solvent may be used. This paint is applied, the organic solvent is volatilized, and then the coating is photocured by irradiation with light, forming a layer containing a transparent resin.
  • the organic solvent is appropriately selected from those suitable for dissolving the photocurable resin composition. Specifically, taking into consideration coating suitability such as wettability to the translucent substrate, viscosity, and drying speed, a single or mixed solvent selected from alcohols, esters, ketones, ethers, and aromatic hydrocarbons can be used.
  • Particles may be dispersed in the transparent resin.
  • the particle size is not limited as long as it can form the first surface 1a of the antiglare layer 1 into an uneven surface.
  • particles scattering particles
  • the method for forming the first surface 1a of the antiglare layer 1 into an uneven surface is not limited to the method using particles, and known methods such as embossing can also be used.
  • the particles include cross-linked polymer particles of methyl methacrylate or polystyrene, and silica particles.
  • Additives may be added to the transparent resin.
  • additives include leveling agents, ultraviolet (UV) absorbers, antistatic agents, and thickeners.
  • Leveling agents aim to equalize the tension of the coating surface formed from a paint containing a transparent resin or its precursor (such as a curable resin) and an organic solvent, and repair defects before the anti-glare layer is formed. Substances with lower interfacial and surface tensions than the transparent resin or its precursor are used.
  • Thickeners impart thixotropy to the paint, preventing the settling of particles and making it easier to form fine irregularities on the surface of the anti-glare layer.
  • the arithmetic mean roughness (Ra) of the first surface 1a (concave-convex surface) of the antiglare layer 1 is preferably 0.05 ⁇ m to 1.00 ⁇ m, more preferably 0.10 ⁇ m to 0.80 ⁇ m, and even more preferably 0.15 ⁇ m to 0.50 ⁇ m.
  • Ra is equal to or greater than the lower limit, the antiglare properties are more excellent.
  • Ra is equal to or less than the upper limit, the haze of the film for display 10 is low, and therefore the image clarity is more excellent.
  • Ra is measured in accordance with JIS B0601:2013.
  • the internal haze of the antiglare layer 1 is preferably 20% or less, more preferably 10% or less, and even more preferably 5% or less.
  • the internal haze is caused by internal scattering in the antiglare layer 1. When the internal haze is equal to or less than the upper limit, the image clarity and black brightness/contrast are more excellent.
  • the internal haze is measured using a haze meter in accordance with JIS K7136-1:2000.
  • the internal haze of the antiglare layer 1 can be adjusted, for example, by the content ratio of scattering particles (particles having a refractive index different from that of the matrix (the resin constituting the layer) by 0.03 or more) in the antiglare layer 1, the type of scattering particles, etc.
  • the internal haze tends to decrease as the content ratio of scattering particles decreases or the difference between the refractive index of the scattering particles and that of the matrix decreases.
  • the content of the scattering particles in the antiglare layer 1 is preferably 30 parts by weight or less, and may be 0 part by weight, based on the resin constituting the layer.
  • the thickness of the antiglare layer 1 is preferably from 1 to 25 ⁇ m, more preferably from 2 to 10 ⁇ m, and even more preferably from 3 to 7 ⁇ m.
  • the antiglare properties are more excellent.
  • the antiglare layer 1 is a layer formed from a photocurable resin composition
  • the thickness of the antiglare layer 1 is equal to or greater than the above-mentioned lower limit
  • poor curing is less likely to occur during photocuring, and the antiglare layer 1 has excellent abrasion resistance.
  • the thickness of the antiglare layer 1 is equal to or less than the upper limit, the image clarity is superior.
  • the antiglare layer 1 is a layer formed from a photocurable resin composition
  • defects due to cure shrinkage such as curling, microcracks, and reduced adhesion to the translucent substrate
  • an increase in cost due to an increase in the amount of paint required as the film thickness increases can be suppressed.
  • the light-transmitting substrate 5 functions as a support for the antiglare layer 1 .
  • the total light transmittance of the light-transmitting substrate 5 is preferably 80% or more, more preferably 85% or more, and even more preferably 90% or more.
  • the total light transmittance of the light-transmitting substrate 5 is, for example, 100% or less.
  • the total light transmittance of the light-transmitting substrate 5 is measured by a haze meter in accordance with JIS K7361-1:1997.
  • the haze of the light-transmitting substrate 5 is preferably 3.0% or less, more preferably 1.0% or less, and even more preferably 0.5% or less.
  • the haze of the light-transmitting substrate 5 is, for example, 0% or more.
  • the haze of the light-transmitting substrate 5 is measured by a haze meter in accordance with JIS K7136-1:2000.
  • the translucent substrate 5 is not particularly limited as long as it is translucent, and examples include glass such as quartz glass and soda glass; and resin films such as polyethylene terephthalate (PET), triacetyl cellulose (TAC), polyethylene naphthalate (PEN), polymethyl methacrylate (PMMA), polycarbonate (PC), polyimide (PI), polyethylene (PE), polypropylene (PP), polyvinyl alcohol (PVA), polyvinyl chloride (PVC), cycloolefin copolymer (COC), norbornene-containing resin, polyethersulfone (PES), cellophane, and aromatic polyamide.
  • PET and TAC films are preferred.
  • the light-transmitting substrate 5 may be a polarizing plate.
  • a polarizing plate is one in which a polarizing element (e.g., a PVA film) is sandwiched between a pair of protective layers (e.g., a TAC film).
  • the thickness of the light-transmitting substrate 5 is preferably thin from the perspective of weight reduction, but considering productivity and ease of handling, it is preferably 1 ⁇ m to 5 mm, more preferably 10 to 500 ⁇ m, and even more preferably 25 to 150 ⁇ m.
  • the surface of the translucent substrate 5 may be subjected to surface treatments such as alkali treatment, plasma treatment, corona treatment, sputtering treatment, and saponification treatment, or surface modification treatments such as application of a surfactant or silane coupling agent, or Si vapor deposition, in order to improve adhesion to the antiglare layer 1 or transparent adhesive layer 7.
  • surface treatments such as alkali treatment, plasma treatment, corona treatment, sputtering treatment, and saponification treatment, or surface modification treatments such as application of a surfactant or silane coupling agent, or Si vapor deposition, in order to improve adhesion to the antiglare layer 1 or transparent adhesive layer 7.
  • the transparent adhesive layer 7 is not particularly limited, and a known transparent adhesive layer such as an OCA (optically transparent adhesive) can be used.
  • the transparent adhesive layer 7 generally contains a base resin and further contains optional components as necessary.
  • the base resin for the transparent adhesive layer 7 include polyester-based resins, epoxy-based resins, polyurethane-based resins, silicone-based resins, and acrylic-based resins. Acrylic-based resins are preferred because of their high optical transparency and relatively low cost.
  • the total light transmittance of the transparent adhesive layer 7 is preferably 60% or more, more preferably 80% or more, and even more preferably 90% or more.
  • the total light transmittance of the transparent adhesive layer 7 is, for example, 100% or less.
  • the total light transmittance of the transparent adhesive layer 7 is measured using a haze meter in accordance with JIS K7361-1:1997.
  • the method for producing the display film 10 is not particularly limited, but may include, for example, a production method including the following steps (i) to (ii). (i) A step of producing an anisotropic light-diffusing film 3. (ii) A process of bonding the surface of the antiglare layer laminate 9, in which an antiglare layer 1 is formed on one surface of a translucent substrate 5, facing the translucent substrate 5 to an anisotropic light-diffusing film 3 via a transparent adhesive layer 7.
  • the anisotropic light-diffusing film 3 is produced, for example, with reference to the methods disclosed in WO 2021/187555, WO 2022/044598, and WO 2022/138390.
  • a composition for an anisotropic light-diffusing film (a composition used to produce the anisotropic light-diffusing film 3, hereinafter sometimes referred to as a "photocurable resin composition” or "composition") is applied to a suitable substrate such as a transparent PET film to form a sheet, and an uncured resin composition layer is formed. This uncured resin composition layer is dried as necessary to volatilize the solvent, and then the uncured resin composition layer is irradiated with light to produce the anisotropic light-diffusing film 3.
  • Step 1-1 Step of providing an uncured resin composition layer on a substrate
  • Step 1-2 Step of obtaining parallel light rays from a light source
  • Optional Step 1-3 Step of obtaining directional light rays
  • Step 1-4 Step of curing the uncured resin composition layer
  • composition for an anisotropic light-diffusing film contains component (A), which is a photopolymerizable compound.
  • component (B) which is a photopolymerization initiator.
  • component (C) which is at least one plasticizer selected from the group consisting of ester-based, epoxy-based, and liquid rubber-based plasticizers.
  • composition for an anisotropic light-diffusing film preferably contains component (D), which is a thermoplastic polymer.
  • component (E) which is a polymerization inhibitor.
  • the composition for an anisotropic light-diffusing film may contain another component (F).
  • the refractive index of each component is measured using a method in accordance with JIS K0062.
  • photopolymerizable compound examples include compounds (macromonomers, polymers, oligomers, monomers, etc.) having a radically polymerizable functional group with an unsaturated double bond, such as an acryloyl group, a methacryloyl group, or an allyl group.
  • Radical polymerizable compounds include compounds containing one or more unsaturated double bonds in the molecule. These compounds may be used alone or in combination. Methacrylates can also be used, but acrylates are generally preferred over methacrylates because they have a faster photopolymerization rate.
  • component (A) is preferably composed of a (meth)acrylic acid ester, and particularly preferably composed of a first (meth)acrylic acid ester having multiple aromatic rings and one (only one) (meth)acryloyl group, and a second (meth)acrylic acid ester that is a component different from the first (meth)acrylic acid ester and is component (b1) and/or component (b2).
  • the second (meth)acrylic acid ester may be either component (b1) or component (b2) alone, or may contain both component (b1) and component (b2).
  • the component (A) when the component (A) is composed of a (meth)acrylic acid ester, the component (A) may optionally contain a third (meth)acrylic acid ester having one or more fluorene skeletons and one or more (meth)acryloyl groups, or other (meth)acrylic acid esters.
  • the first (meth)acrylic acid ester preferably has a biphenyl ring structure or a diphenyl ether structure as a structure containing multiple aromatic rings.
  • the first (meth)acrylic acid ester may have only one biphenyl structure or one or more diphenyl ether structures in the skeleton. The presence of such a structure results in a (meth)acrylic acid ester with a very high refractive index.
  • the first (meth)acrylic acid ester is typically a high refractive index material.
  • the refractive index of the first (meth)acrylic acid ester is preferably 1.50 or higher, more preferably 1.53 or higher, and even more preferably 1.56 or higher.
  • the refractive index is preferably 1.70 or lower, more preferably 1.65 or lower, and even more preferably 1.60 or lower.
  • Such first (meth)acrylic acid esters are not particularly limited, but include biphenyl compounds represented by the following general formula (1) or diphenyl ether compounds represented by the following general formula (2).
  • R 1 to R 10 are each independent, and any one of R 1 to R 10 is a substituent represented by the following general formula (3) or (4).
  • the remainder may be any group so long as it does not contain a (meth)acryloyl group, and specific examples of the substituents include a hydrogen atom, a hydroxyl group, a carboxyl group, an alkyl group, an alkoxy group, a halogenated alkyl group, a hydroxyalkyl group, a carboxyalkyl group, and a halogen atom.
  • R 11 to R 20 are each independent, and any one of R 11 to R 20 is a substituent represented by the following general formula (3) or (4).
  • the remainder may be any group as long as it does not contain a (meth)acryloyl group, and specific examples of such substituents include a hydrogen atom, a hydroxyl group, a carboxyl group, an alkyl group, an alkoxy group, a halogenated alkyl group, a hydroxyalkyl group, a carboxyalkyl group, and a halogen atom.
  • R 21 is a hydrogen atom or a methyl group, the number of carbon atoms n is an integer of 1 to 4, and the number of repetitions m is an integer of 1 to 10.
  • R 22 is a hydrogen atom or a methyl group, the number of carbon atoms n is an integer of 1 to 4, and the number of repetitions m is an integer of 1 to 10.
  • the repeating number m in the substituents represented by the general formulae (3) and (4) is preferably an integer of 1 to 10.
  • the repeating number m in the substituents represented by the general formulae (3) and (4) is more preferably an integer of 1 to 4, and even more preferably an integer of 1 or 2.
  • the number of carbon atoms n in the substituents represented by the general formulae (3) and (4) is preferably an integer of 1 to 4, more preferably an integer of 1 or 2.
  • a specific example of a biphenyl compound represented by the above general formula (1) is preferably a compound represented by the following formula (5):
  • a specific example of a diphenyl ether compound represented by the above general formula (2) is preferably a compound represented by the following formula (6):
  • the first (meth)acrylic acid ester may contain only one of the above-mentioned components, or may contain multiple components.
  • the viscosity of the first (meth)acrylic acid ester at 25° C. is preferably 1000 mPa ⁇ s or less, more preferably 500 mPa ⁇ s or less, and even more preferably 100 mPa ⁇ s or less.
  • the lower limit of the viscosity is not particularly limited, but is, for example, 1 mPa ⁇ s.
  • the viscosity of the first (meth)acrylic acid ester at 25°C is within this range, the fluidity of the composition is increased when the components in component (A) are used in combination, which promotes phase separation of the components during curing and improves the diffusion performance of the resulting anisotropic light-diffusing film.
  • the second (meth)acrylic acid ester is a component different from the first (meth)acrylic acid ester and is the component (b1) and/or the component (b2).
  • the second (meth)acrylic acid ester may be either the component (b1) or the component (b2) alone, or may contain both the component (b1) and the component (b2).
  • Component (b1) is a (meth)acrylic acid ester having multiple (meth)acryloyl groups.
  • the number of (meth)acryloyl groups contained in component (b1) is not particularly limited, but may be 2 to 3 to improve the flexibility of the anisotropic light-diffusing film after photocuring, or 4 to 6 to improve the rigidity and heat resistance of the anisotropic light-diffusing film after photocuring.
  • the component (b1) is not particularly limited, but examples include pentaerythritol tetraacrylate represented by the following general formula (7):
  • the first (meth)acrylic acid ester may be one that does not contain a hydroxyl group, a carboxyl group, or an amino group.
  • Component (b2) is a (meth)acrylic acid ester having one or more of a hydroxyl group, a carboxyl group, or an amino group, and one (and only one) (meth)acryloyl group.
  • component (b2) may have two or more hydroxyl groups, carboxyl groups, or amino groups. In that case, it may have two or more of the same type of functional group (e.g., two or more hydroxyl groups), or it may have a total of two or more different types of functional groups (e.g., one or more hydroxyl groups and one or more carboxyl groups).
  • the (b2) component is not particularly limited, but examples include (meth)acrylic acid esters represented by the following general formula (8):
  • R25 is a hydrogen atom or a methyl group
  • R26 is any one of a hydroxyl group, a carboxyl group, and an amino group
  • R27 is any one of a hydrogen atom, a hydroxyl group, a carboxyl group, an alkyl group, an alkoxy group, a halogenated alkyl group, a hydroxyalkyl group, a carboxyalkyl group, and a halogen atom.
  • the substituent R 26 represented by the general formula (8) is typically a hydroxyl group, a carboxyl group, or an amino group.
  • the functional group acts as a "hydrogen bond donor" and a "hydrogen bond acceptor,” generating hydrogen bonds in the molecular structure of the anisotropic light-diffusing film after photocuring, resulting in a complex three-dimensional structure and weakening the ⁇ - ⁇ stacking interaction between the aromatic rings derived from the first (meth)acrylic acid ester. Therefore, in order to strengthen the effect of the hydrogen bonds, it is more preferable that the functional group R 26 be a hydroxyl group.
  • the substituent R 27 is usually preferably any one of a hydrogen atom, a hydroxyl group, a carboxyl group, an alkyl group, an alkoxy group, a halogenated alkyl group, a hydroxyalkyl group, a carboxyalkyl group, and a halogen atom, and among these, an alkoxy group having an aromatic ring is more preferable in order to increase the refractive index.
  • a specific example of the (meth)acrylic acid ester represented by the above general formula (8) is preferably the compound represented by the following formula (9):
  • the second (meth)acrylic acid ester is preferably a high refractive index material.
  • the refractive index value is not particularly limited, but specifically, it is preferably 1.44 or higher, more preferably 1.48 or higher, and even more preferably 1.52 or higher. There is no particular upper limit to the refractive index, but it is preferably 1.57 or lower, for example. By setting the refractive index of the second (meth)acrylic acid ester within this range, the diffusivity of the anisotropic light-diffusing film can be further improved.
  • the second (meth)acrylic acid ester preferably has an aromatic ring structure in order to be a high refractive index material as described above.
  • the second (meth)acrylic acid ester may contain only one of the above-mentioned components, or may contain multiple components.
  • the first (meth)acrylic acid ester is considered useful as a high-refractive index polymerizable compound, but it generates ⁇ - ⁇ stacking interactions. As mentioned above, it is believed that this ⁇ - ⁇ stacking interaction results in the appearance of a color.
  • component (b1) As the second (meth)acrylic acid ester, the multiple (meth)acryloyl groups contained in component (b1) give the composition for anisotropic light-diffusing films a complex three-dimensional structure after photocuring, making it less likely that ⁇ - ⁇ stacking interactions will occur between aromatic rings.
  • component (b2) has functional groups that act as a "hydrogen bond donor” and a "hydrogen bond acceptor.”
  • hydrogen bonds are introduced into the molecular structure of the anisotropic light-diffusing film after photocuring of the composition for anisotropic light-diffusing films, resulting in a complex three-dimensional structure that makes it difficult for ⁇ - ⁇ stacking interactions between aromatic rings to occur. Hydroxyl groups, carboxyl groups, and amino groups are used as functional groups to achieve this effect.
  • the third (meth)acrylic acid ester is a (meth)acrylic acid ester having one or more fluorene skeletons and one or more (meth)acryloyl groups, and is an optional component.
  • the third (meth)acrylic acid ester may contain one or more aromatic rings (aromatic ring group/aromatic ring-containing group) as substituents on the fluorene skeleton, and preferably contains two or more aromatic rings as substituents on the fluorene skeleton.
  • aromatic rings aromatic ring group/aromatic ring-containing group
  • the number of (meth)acryloyl groups contained in the third (meth)acrylic acid ester is not particularly limited, but can be one or more, and preferably contains multiple (meth)acryloyl groups. Furthermore, the upper limit is not particularly limited, but it is preferably eight or less.
  • a specific example of a third (meth)acrylic acid ester containing two or more aromatic rings as substituents on the fluorene skeleton is a compound represented by the following formula (10):
  • R A and R C are each independently a substituent containing a (meth)acryloyl group, preferably a (meth)acryloyloxy group (which may have 1 to 5 repeating groups with ethylene oxide (EO) or propylene oxide (PO) added).
  • R B and R D are each independently a hydrogen atom or an aliphatic substituent having 1 to 6 carbon atoms.
  • examples of the third (meth)acrylic acid ester include compounds represented by the following formulas (11) to (13).
  • the third (meth)acrylic acid ester can be a commercially available product.
  • commercially available third (meth)acrylic acid esters include "A-BPEF-2" (9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene diacrylate) manufactured by Shin-Nakamura Chemical Co., Ltd., and "OGSOL EA-0200,” “OGSOL EA-0300,” “OGSOL EA-5060GP,” and “OGSOL GA-2800” manufactured by Osaka Gas Chemicals Co., Ltd.
  • the refractive index of the third (meth)acrylic acid ester is preferably 1.50 or greater, more preferably 1.53 or greater, and even more preferably 1.56 or greater. There is no particular upper limit to the refractive index, but it is preferably 1.70 or less, for example. By setting the refractive index of the third (meth)acrylic acid ester within this range, the diffusivity of the anisotropic light-diffusing film can be further improved.
  • the third (meth)acrylic acid ester may contain only one of the above-mentioned components, or may contain multiple components.
  • the component (A) may contain other (meth)acrylic acid esters other than the first to third (meth)acrylic acid esters (other (meth)acrylic acid esters typically used in compositions for optical films), as long as the effects of the present invention are not impaired.
  • the viscosity of component (A) as a whole at 25°C is preferably 10,000 mPa ⁇ s or less, more preferably 5,000 mPa ⁇ s or less, even more preferably 3,000 mPa ⁇ s or less, and particularly preferably 1,000 mPa ⁇ s or less.
  • the viscosity of component (A) as a whole at 25°C is most preferably 500 mPa ⁇ s or less, 250 mPa ⁇ s or less, or 100 mPa ⁇ s or less.
  • the lower limit of the viscosity is not particularly limited, but is, for example, 1 mPa ⁇ s.
  • the fluidity of the composition is increased when the individual components of component (A) are used in combination, which promotes phase separation of the individual components during curing and improves the diffusion performance of the resulting anisotropic light-diffusing film.
  • the photopolymerization initiator (B) is a compound that generates radical species when irradiated with active energy rays such as ultraviolet rays, and any known photopolymerization initiator can be used.
  • Photopolymerization initiators include, for example, benzophenone, benzil, Michler's ketone, 2-chlorothioxanthone, 2,4-diethylthioxanthone, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2,2-diethoxyacetophenone, benzil dimethyl ketal, 2,2-dimethoxy-1,2-diphenylethan-1-one, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl
  • suitable compounds include 1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one, 1-[4-(2-hydroxyethoxy)phenyl]-2-hydroxy-2-methyl-1-propan-1-one, bis(cyclopentadienyl)-bis[2,6-difluoro-3-(pyrrol-1-yl)phenyl]titanium, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butan-1-one, and 2,4,6-trimethylbenzoyldiphenylphosphine oxide. These compounds may be used alone or in combination.
  • the photopolymerization initiator can usually be used by dissolving the powder directly in the photopolymerizable compound, but if the solubility is poor, the photopolymerization initiator can also be used by dissolving it in a solvent beforehand.
  • the photocurable resin composition contains at least one plasticizer selected from the group consisting of ester-based, epoxy-based, and liquid rubber-based plasticizers.
  • the plasticizer may be either a photocurable plasticizer or a thermosetting plasticizer. If the plasticizer is a thermosetting compound, it is preferable from the standpoint of curing that the photocurable resin composition further contains a curing agent. In this case, the anisotropic light-diffusing layer is formed by photopolymerization plus thermal polymerization, i.e., photopolymerization plus thermal polymerization.
  • Ester-based plasticizers include fatty acid esters such as stearic acid esters and oleic acid esters; dicarboxylic acid esters such as maleic acid diesters, fumaric acid diesters, adipic acid diesters, sebacic acid diesters, phthalic acid diesters, isophthalic acid diesters, and terephthalic acid diesters; phosphate triesters; and polyesters such as adipate polyesters.
  • fatty acid esters such as stearic acid esters and oleic acid esters
  • dicarboxylic acid esters such as maleic acid diesters, fumaric acid diesters, adipic acid diesters, sebacic acid diesters, phthalic acid diesters, isophthalic acid diesters, and terephthalic acid diesters
  • phosphate triesters and polyesters such as adipate polyesters.
  • ester group of ester-based plasticizers examples include alkyl ester groups such as butyl, pentyl, hexyl, octyl, isooctyl, and decyl, and aryl ester groups such as cresyl.
  • Epoxy plasticizers include epoxidized oils such as epoxidized soybean oil and epoxidized linseed oil.
  • liquid rubber examples include polyisoprene homopolymers or copolymers, polybutadiene homopolymers or copolymers, isoprene and butadiene copolymers, and polystyrene butadiene.
  • Liquid rubber may also be an acid-modified compound made with an unsaturated carboxylic acid such as maleic anhydride or maleic acid.
  • Liquid rubber may also be made photocurable by introducing a photopolymerizable functional group such as an acrylic group.
  • composition for an anisotropic light-diffusing film preferably contains component (D), which is a thermoplastic polymer.
  • the glass transition temperature of component (D) is preferably -40°C or higher, more preferably 0°C or higher, and even more preferably 30°C or higher. There is no particular upper limit to the glass transition temperature, but it is preferably 150°C or lower, for example.
  • the glass transition temperature can be measured using known methods, such as those in accordance with JIS K7121-1987 "Method for measuring the glass transition temperature of plastics.”
  • the weight average molecular weight of component (D) is preferably 1,000 to 500,000, more preferably 10,000 to 400,000, and even more preferably 50,000 to 300,000.
  • the weight average molecular weight can be measured using known methods, such as gel permeation chromatography (GPC) as a polystyrene-equivalent molecular weight.
  • GPC gel permeation chromatography
  • component (D) By setting the glass transition temperature and weight average molecular weight of component (D) within the above ranges, it is possible to improve compatibility with component (A), produce an anisotropic light-diffusing film with excellent performance, improve durability in heat resistance tests, etc., and provide the anisotropic light-diffusing film with an appropriate modulus of elasticity before UV curing, enabling it to be stored in a roll.
  • Component (D) is typically a low refractive index material. Specifically, the refractive index of component (D) is preferably less than 1.55, more preferably less than 1.50, and even more preferably less than 1.48. There are no particular restrictions on the lower limit of the refractive index, but for example, it is preferably 1.35 or greater, and more preferably 1.40 or greater.
  • the difference (nA-nC) between the refractive index nA of component (A) and the refractive index nC of component (D) is preferably 0.01 to 0.3, more preferably 0.03 to 0.3, and particularly preferably 0.05 to 0.3.
  • Such component (D) is not particularly limited, but examples include acrylic resin, styrene resin, styrene-acrylic copolymer, polyurethane resin, polyester resin, epoxy resin, cellulose-based resin, silicone-based resin, vinyl acetate-based resin, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral resin, polyvinyl alcohol resin, polyvinyl formal resin, polyvinyl acetal resin, polyvinylidene fluoride, polymethyl methacrylate (PMMA)-polybutyl acrylate (PBA) block copolymer, polyvinylidene fluoride (PVDF)-hexafluoropropene (HFP) copolymer, and the like.
  • acrylic resin styrene resin, styrene-acrylic copolymer, polyurethane resin, polyester resin, epoxy resin, cellulose-based resin, silicone-based resin, vinyl acetate-based resin, vinyl chloride-vin
  • Component (D) is preferably a urethane (meth)acrylate ester composed of a cyclic aliphatic compound having two isocyanate groups, a polyol compound, and a hydroxyalkyl (meth)acrylate ester.
  • cyclic aliphatic compounds having two isocyanate groups include alicyclic polyisocyanates such as isophorone diisocyanate (IPDI) and hydrogenated diphenylmethane diisocyanate.
  • IPDI isophorone diisocyanate
  • hydrogenated diphenylmethane diisocyanate examples include hydrogenated diphenylmethane diisocyanate.
  • polystyrene resin As the polyol compound, a diol compound is preferred, and a polyalkylene glycol is particularly preferred. Specific examples include polyethylene glycol, polypropylene glycol, polybutylene glycol, and polyhexylene glycol, with polypropylene glycol being preferred.
  • hydroxyalkyl (meth)acrylate esters examples include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate.
  • Component (D) can be produced by synthesizing the above-mentioned components according to conventional methods.
  • Component (D) may contain only one or more of the above-mentioned components. If component (D) consists of multiple components, the refractive index of component (B) may be the average value of those components.
  • phase separation due to the difference in refractive index with the high refractive index material containing component (A) can be facilitated, and when made into an anisotropic light-diffusing film, it is less likely to be indented and has excellent storage properties.
  • the component (E) is a polymerization inhibitor having a structure in which a carbonyl group or a hydroxyl group is added as a substituent of a conjugated cyclic compound.
  • polymerization inhibitors having the above structure examples include so-called quinone-based and phenol-based polymerization inhibitors.
  • component (E) is preferably one or more compounds selected from the group consisting of compounds represented by the following chemical formulas (E1) to (E6).
  • R 1 to R 5 each independently represent a hydrogen atom, a halogen atom, a carboxyl group, or a C1 to C4 (preferably C1 to C3) alkoxy group (e.g., a methoxy group, an ethoxy group, or a propyloxy group) or alkyl group (e.g., a methyl group, an ethyl group, a propyl group, or a tert-butyl group).
  • alkoxy group e.g., a methoxy group, an ethoxy group, or a propyloxy group
  • alkyl group e.g., a methyl group, an ethyl group, a propyl group, or a tert-butyl group.
  • component (E) is preferably a hydroquinone-based (e.g., formula (E1) above), quinone methide-based (e.g., formulas (E2) and (E4) above), benzoquinone-based (e.g., formula (E3) above), phenol-based (e.g., formula (E5) above), or catechol-based (e.g., formula (E6) above) polymerization inhibitor.
  • component (E) is more preferably a hydroquinone-based, quinone methide-based, or benzoquinone-based polymerization inhibitor, and particularly preferably a benzoquinone-based polymerization inhibitor.
  • the polymerization inhibitor may have a structure with an added carbonyl group or hydroxyl group, so in addition to compounds represented by any of the above formulas (E1) to (E6), pyrogallol-based and naphthoquinone-based polymerization inhibitors can also be used.
  • component (A) a high refractive index material, and a polymerization initiator
  • component (A) a high refractive index material
  • a polymerization initiator a specific polymerization inhibitor ensures appropriate growth of the structural regions described below, resulting in improved optical properties (particularly the diffusion width).
  • the composition may contain various known dyes, sensitizers, and other known additives to improve photopolymerization, etc.
  • the composition may also contain a solvent, a dispersion medium, etc. These are optional components and may be used alone or in combination, or may be omitted.
  • a curing agent that can cure the photopolymerizable compound by heating can be used in combination with the photopolymerization initiator.
  • Solvents that can be used when preparing compositions containing photopolymerizable compounds include, for example, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, toluene, and xylene.
  • the composition does not contain an acid generator as another component.
  • the content of acid generator in the composition is 1% or less.
  • component (A) The content of component (A) relative to the total solid content of the composition (total amount of nonvolatile components excluding volatile solvents) is not particularly limited, but is preferably 30% by weight or more, 35% by weight or more, 40% by weight or more, or 45% by weight or more.
  • the upper limit is not particularly limited, but is, for example, 99% by weight, 95% by weight, 90% by weight, 85% by weight, 80% by weight, 70% by weight, or 60% by weight.
  • the content of the second (meth)acrylic acid ester is 50 to 1,000 parts by weight, more preferably 65 to 900 parts by weight, and even more preferably 75 to 200 parts by weight, per 100 parts by weight of the first (meth)acrylic acid ester.
  • the content of the third (meth)acrylic acid ester in the composition is 3 to 100 parts by weight, preferably 4 to 50 parts by weight, and more preferably 5 to 25 parts by weight, based on 100 parts by weight of the other (A) components.
  • the total content of the first to third (meth)acrylic acid esters relative to component (A) can be 50% by weight or more (preferably 70% by weight or more, 80% by weight or more, or 90% by weight or more).
  • component (B) is preferably 0.1 to 20 parts by weight, more preferably 0.1 to 15 parts by weight, and even more preferably 0.1 to 7 parts by weight, per 100 parts by weight of component (A).
  • the blending ratio of the plasticizer in the composition for an anisotropic light-diffusing film is preferably 30% by weight or less of the total weight of the composition for an anisotropic light-diffusing film.
  • the content of component (D) is preferably 10 parts by weight to 400 parts by weight, more preferably 25 parts by weight to 150 parts by weight, and even more preferably 40 parts by weight to 100 parts by weight, per 100 parts by weight of component (A).
  • the content of component (D) relative to the total amount of non-volatile components of the composition is preferably 10 to 80% by weight, more preferably 15 to 70% by weight, and even more preferably 20 to 60% by weight.
  • the content of component (E) in the composition is preferably 0.001 to 1 part by weight, more preferably 0.005 to 0.5 parts by weight, even more preferably 0.008 to 0.1 parts by weight, and still more preferably 0.015 to 0.05 parts by weight, when the total amount of non-volatile components of the composition is 100 parts by weight.
  • the content of component (E) in the composition relative to the total amount of non-volatile components of the composition is preferably 0.001% by weight to 0.5% by weight, more preferably 0.005% by weight to 0.1% by weight, and even more preferably 0.01% by weight to 0.04% by weight.
  • the total content of the components (A) and (D) relative to the total solid content of the composition is not particularly limited, and can be, for example, 50% by weight or more, 60% by weight or more, 70% by weight or more, 80% by weight or more, 90% by weight or more, 95% by weight or more, 99% by weight or more, 100% by weight, etc.
  • the ratio of [content of component (E) / content of component (B)] is preferably 0.005 to 0.1, and more preferably 0.01 to 0.05.
  • the photocurable resin composition can be applied to a substrate in the form of a sheet as an uncured resin composition layer by conventional coating or printing methods. Specifically, coating methods such as air doctor coating, bar coating, blade coating, knife coating, reverse coating, transfer roll coating, gravure roll coating, kiss coating, cast coating, spray coating, slot orifice coating, calendar coating, dam coating, dip coating, and die coating, as well as printing methods such as intaglio printing (e.g., gravure printing) and stencil printing (e.g., screen printing), can be used.
  • coating methods such as air doctor coating, bar coating, blade coating, knife coating, reverse coating, transfer roll coating, gravure roll coating, kiss coating, cast coating, spray coating, slot orifice coating, calendar coating, dam coating, dip coating, and die coating, as well as printing methods such as intaglio printing (e.g., gravure printing) and stencil printing (e.g., screen printing), can be used.
  • a dam of a certain height can be provided around the substrate, and the composition can be cast
  • step 1-1 to prevent oxygen inhibition of the uncured resin composition layer and efficiently form the columnar regions that are characteristic of anisotropic light-diffusing films, it is also possible to laminate a mask that adheres closely to the light-irradiated side of the uncured resin composition layer and locally changes the light irradiation intensity.
  • the mask material is preferably one in which a light-absorbing filler such as carbon is dispersed in a matrix, so that some of the incident light is absorbed by the carbon, but the openings allow sufficient light to pass through.
  • a light-absorbing filler such as carbon
  • Such matrices include transparent plastics such as polyethylene terephthalate (PET), triacetyl cellulose (TAC), polyvinyl acetate (PVAc), polyvinyl alcohol (PVA), acrylic resin, and polyethylene, as well as inorganic materials such as glass and quartz.
  • PET polyethylene terephthalate
  • TAC triacetyl cellulose
  • PVAc polyvinyl acetate
  • PVA polyvinyl alcohol
  • acrylic resin acrylic resin
  • polyethylene as polyethylene
  • the mask may be a sheet containing such a matrix with a pattern to control the amount of UV light transmitted, or a matrix containing a pigment that absorbs UV light.
  • a short-arc ultraviolet light source is usually used, and specifically, a high-pressure mercury lamp, a low-pressure mercury lamp, a metal halide lamp, a xenon lamp, etc.
  • a high-pressure mercury lamp a low-pressure mercury lamp
  • a metal halide lamp a metal halide lamp
  • a xenon lamp etc.
  • it is necessary to obtain light rays parallel to the desired scattering central axis and such parallel light rays can be obtained, for example, by arranging a point light source and arranging an optical lens such as a Fresnel lens between this point light source and the uncured resin composition layer to irradiate parallel light rays, or by arranging a reflecting mirror behind the light source so that light is emitted as a point light source in a predetermined direction.
  • Step 1-3 is a step of making parallel light incident on a directional diffusion element to obtain directional light.
  • Figures 5 and 6 are schematic diagrams showing a method for producing an anisotropic light-diffusing film according to the present invention, including optional steps 1-3.
  • the directional diffusion elements 301 and 302 used in optional steps 1-3 may be any element that imparts directionality to the parallel light beam D incident from the light source 300.
  • directional light E is incident on the uncured resin composition layer 303 in a manner that causes it to diffuse significantly in the X direction and little in the Y direction.
  • a method can be used in which needle-shaped fillers with a high aspect ratio are contained in the directional diffusion elements 301 and 302 and the needle-shaped fillers are oriented so that their major axis extends in the Y direction.
  • various methods can be used for the directional diffusion elements 301 and 302.
  • the aspect ratio of the directional light E is between 2 and 50.
  • a columnar region is formed having an aspect ratio that roughly corresponds to this aspect ratio.
  • the size of the columnar regions formed can be appropriately determined by adjusting the spread of the directional light E.
  • the anisotropic light-diffusing film of this embodiment can be obtained in both Figures 5 and 6.
  • the difference between Figures 5 and 6 is that the spread of the directional light E is large in Figure 5 but small in Figure 6.
  • the size of the columnar regions will differ depending on the size of the spread of the directional light E.
  • the spread of directional light E depends mainly on the type of directional diffusion elements 301 and 302 and the distance from the uncured resin composition layer 303. As the distance is shortened, the size of the columnar region becomes smaller, and as the distance is lengthened, the size of the columnar region becomes larger. Therefore, the size of the columnar region can be adjusted by adjusting the distance.
  • Step 1-4 Step of curing uncured resin composition layer>
  • the light irradiated onto the uncured resin composition layer to cure it must contain a wavelength capable of curing the photopolymerizable compound, and light with a wavelength centered at 365 nm from a mercury lamp is usually used.
  • the illuminance is preferably in the range of 0.01 mW/cm 2 to 100 mW/cm 2 , and more preferably 0.1 mW/cm 2 to 20 mW/cm 2. If the illuminance is less than 0.01 mW/cm 2 , curing takes a long time, resulting in poor production efficiency. If it exceeds 100 mW/cm 2 , the photopolymerizable compound cures too quickly, preventing structure formation and making it impossible to achieve the desired optical properties.
  • the light irradiation time is not particularly limited, but is preferably 10 to 180 seconds, and more preferably 30 to 120 seconds. By irradiating with the above light rays, the anisotropic light-diffusing film of this embodiment can be obtained.
  • the anisotropic light-diffusing film is obtained by irradiating the uncured resin composition layer with low-intensity light for a relatively long period of time, thereby forming a specific internal structure. Therefore, such light irradiation alone may leave unreacted monomer components, causing stickiness and problems with handling and durability. In such cases, the remaining monomers can be polymerized by additional irradiation with high-intensity light of 1000 mW/ cm2 or more. This light irradiation may be performed from the side opposite the side where the mask is laminated.
  • the central scattering axis of the resulting anisotropic light-diffusing film can be made as desired.
  • the anisotropic light-diffusing film may further have other layers (adhesive layer, functional layer, transparent film layer, etc.).
  • step (ii) In step (ii), the surface of the antiglare layer laminate 9, which has the antiglare layer 1 formed on one surface of the translucent substrate 5, facing the translucent substrate 5 is bonded to the anisotropic light-diffusing film 3 obtained in step (i) via the transparent adhesive layer 7. This produces a film 10 for displays.
  • the antiglare layer laminate 9 may be a commercially available product, or may be manufactured by a known manufacturing method.
  • the antiglare layer laminate 9 can be manufactured by forming an antiglare layer 1 on one surface of a light-transmitting substrate 5.
  • the method for forming the antiglare layer 1 is not particularly limited and may be a known method. Examples include methods described in International Publication No. 2005/093468, International Publication No. 2008/093769, Japanese Patent Application Publication No. 2010-248451, Japanese Patent Application Publication No. 2011-013238, and Japanese Patent Application Publication No. 2010-256882.
  • a commercially available transparent adhesive sheet can be used as the transparent adhesive layer 7. It is also possible to use a transparent adhesive sheet manufactured using a known manufacturing method.
  • a display film 11 shown in Figure 3 may be configured without a translucent substrate 5 and a transparent adhesive layer 7.
  • Such a display film can be obtained, for example, by directly forming an antiglare layer on one surface of an anisotropic light-diffusing film 3.
  • a display film 12 may be configured without the transparent adhesive layer 7 .
  • Such a display film can be obtained, for example, by directly forming the anisotropic light-diffusing film 3 on the surface of the light-transmitting substrate 5 opposite to the anti-glare layer 1 side.
  • the display film of the present invention may further comprise layers other than the antiglare layer 1, the anisotropic light-diffusing film 3, the translucent substrate 5, and the transparent adhesive layer 7.
  • layers include a retardation layer, a light-reflecting layer, and an optical control layer.
  • the other layers may be provided between the antiglare layer 1 and the anisotropic light-diffusing film 3, or on the side of the anisotropic light-diffusing film 3 opposite the antiglare layer 1.
  • the display of the present invention comprises the display film of the present invention.
  • LCDs liquid crystal displays
  • PDPs plasma display panels
  • EL organic electroluminescence
  • FEDs field emission displays
  • CRTs cathode ray tube displays
  • SEDs surface-emitting diode displays
  • the display of the present invention typically comprises a display body having a display surface, and a display film of the present invention arranged on the display surface of the display body.
  • the display film of the present invention is arranged with the antiglare layer side facing the viewing side (opposite the display surface side). It is preferable to arrange the antiglare layer so that it is on the most visible side in the thickness direction of the display film.
  • the display film can be attached to the display surface via a transparent adhesive layer or the like.
  • Anisotropic light-diffusing films of examples of the present invention and comparative examples were prepared according to the following methods.
  • composition solution 1 for anisotropic light-diffusing films The various materials shown below were mixed and stirred in the amounts shown below to obtain composition solution 1 for anisotropic light-diffusing films.
  • Component (A) 100 parts by weight of ethylene oxide (EO)-modified bisphenol A diacrylate (manufactured by Kyoeisha Chemical Co., Ltd., trade name: Light Acrylate (registered trademark) BP-4EAL, refractive index: 1.54 (25°C));
  • Component (B) 60 parts by weight of polyvinyl acetate (PVAc) (refractive index: 1.460, weight-average molecular weight: 200,000, glass transition temperature: 40°C);
  • Component (C) 20 parts by weight of ester-based plasticizer (manufactured by DIC Corporation, trade name: Polycizer (registered trademark) W-230-H, viscosity: 220 mPa ⁇ s (25°C));
  • Component (D) 2 parts by weight of 2,2-dimethoxy-2-phenylacetophenone; Solvent: 150 parts by weight of butyl acetate.
  • composition layer 1 for Anisotropic Light-Diffusing Film The obtained composition solution 1 for anisotropic light-diffusing film was applied to a 100 ⁇ m-thick PET film (manufactured by Toyobo Co., Ltd., product name: A4360) using an applicator. The coating was then dried in a clean oven with the temperature inside the drying furnace set to 80° C., thereby obtaining a composition layer 1 for anisotropic light-diffusing film with a thickness of 40 ⁇ m.
  • a polyvinyl alcohol film with uniformly dispersed carbon (hereinafter referred to as a PVA mask) was laminated using a laminator on the side of the composition layer 1 for anisotropic light-diffusing films that was not in contact with the PET film.
  • the resulting laminate was heated to 60°C, and while maintaining the temperature constant, parallel light emitted from an ultraviolet epi-irradiation unit (manufactured by Hamamatsu Photonics KK, product name: L2859-01) was irradiated from above the PVA mask surface at an irradiation intensity of 2.0 mW/ cm2 for 30 seconds.
  • an ultraviolet epi-irradiation unit manufactured by Hamamatsu Photonics KK, product name: L2859-01
  • the light was irradiated at an angle not tilted from the normal direction of the composition layer 1 for anisotropic light-diffusing films.
  • the PVA mask and the PET film were peeled off from the obtained laminate, to obtain an anisotropic light-diffusing film 1 of Example 1 which was a single-layer anisotropic light-diffusing layer 1 .
  • the thickness of the anisotropic light-diffusing film 1 was 40 ⁇ m, and the average height of the columnar structures was 40 ⁇ m.
  • Example 2 An anisotropic light-diffusing film 2 of Example 2, which is a single-layer anisotropic light-diffusing layer 2, was obtained in the same manner as in Example 1, except that the component (A) was changed to 10 parts by weight of 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene diacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., product name: A-BPEF-2, refractive index: 1.62 (25°C), number of aromatic rings possessed as substituents on the fluorene skeleton: 2) and 90 parts by weight of m-phenoxybenzyl acrylate (refractive index: 1.57 (25°C), viscosity: 18 mPa s (25°C)).
  • the thickness of the anisotropic light-diffusing film 2 was 40 ⁇ m, and the average height of the columnar structures was 40 ⁇ m.
  • Example 3 An anisotropic light-diffusing film 3 of Example 3, which is a single-layer anisotropic light-diffusing layer 3, was obtained in the same manner as in Example 2, except that in the formulation of Example 2, component (C) was changed to 20 parts by weight of an epoxy-based plasticizer (manufactured by DIC Corporation, product name: Eposizer (registered trademark) W-100-EL, viscosity: 500 mPa s (25°C)). The thickness of the anisotropic light-diffusing film 3 was 40 ⁇ m, and the average height of the columnar structures was 40 ⁇ m.
  • component (C) was changed to 20 parts by weight of an epoxy-based plasticizer (manufactured by DIC Corporation, product name: Eposizer (registered trademark) W-100-EL, viscosity: 500 mPa s (25°C)).
  • the thickness of the anisotropic light-diffusing film 3 was 40 ⁇ m, and the average height of the columnar structures was
  • Example 4 The same procedure as in Example 2 was carried out, except that in the formulation of Example 2, component (C) was changed to 20 parts by weight of a liquid rubber-based plasticizer (manufactured by Kuraray Co., Ltd., product name: LIR (registered trademark)-390, viscosity: 400 mPa s (38°C)).
  • An anisotropic light-diffusing film 4 of Example 4 which was a single-layer anisotropic light-diffusing layer 4, was obtained.
  • the thickness of the anisotropic light-diffusing film 4 was 40 ⁇ m, and the average height of the columnar structures was 40 ⁇ m.
  • Example 5 An anisotropic light-diffusing film 5 of Example 5, which is a single-layer anisotropic light-diffusing layer 5, was obtained in the same manner as in Example 2, except that in the formulation of Example 2, component (C) was changed to 20 parts by weight of a UV-curable liquid rubber-based plasticizer (manufactured by Kuraray Co., Ltd., product name: UC-203M, viscosity: 190 mPa s (38°C)). The thickness of the anisotropic light-diffusing film 5 was 40 ⁇ m, and the average height of the columnar structures was 40 ⁇ m.
  • component (C) was changed to 20 parts by weight of a UV-curable liquid rubber-based plasticizer (manufactured by Kuraray Co., Ltd., product name: UC-203M, viscosity: 190 mPa s (38°C)).
  • the thickness of the anisotropic light-diffusing film 5 was 40 ⁇ m, and the average height
  • Example 6 The same method as in Example 2 was used to prepare an anisotropic light-diffusing film 6 of Example 6, which is a single-layer anisotropic light-diffusing film 6.
  • Parallel light emitted from an incident-light irradiation unit was converted into a linear light beam via a directional diffusion element that gave the light beam an aspect ratio of 40, and the angle at which this linear light beam was irradiated was in a direction (hereinafter referred to as the MD direction) perpendicular to both the direction in which the light beam was diffused by the directional diffusion element and the thickness direction of the composition layer for an anisotropic light-diffusing film, without being tilted from the normal direction of the composition layer for an anisotropic light-diffusing film.
  • the thickness of the anisotropic light-diffusing film 6 was 40 ⁇ m, and the average height of the columnar structures was 40 ⁇ m.
  • Example 7 The same method as in Example 2 was used to prepare a laminate in which a PVA mask was laminated on a composition layer for an anisotropic light-diffusing film.
  • Parallel light emitted from an incident-light irradiation unit was converted into linear light via a directional diffusion element that gave the light an aspect ratio of 3, and the angle at which this linear light was irradiated was in the MD direction, without being tilted from the normal direction of the composition layer for an anisotropic light-diffusing film.
  • the thickness of the anisotropic light-diffusing film 7 was 40 ⁇ m, and the average height of the columnar structures was 40 ⁇ m.
  • Example 8 The same procedure as in Example 7 was carried out, except that the thickness of the anisotropic light-diffusing film 8 was 30 ⁇ m and the average height of the columnar structures was 30 ⁇ m, to obtain an anisotropic light-diffusing film 8 of Example 8, which is a single-layer anisotropic light-diffusing layer 8.
  • Comparative Example 1 An anisotropic light-diffusing film a of Comparative Example 1, which was a single-layer anisotropic light-diffusing layer a, was obtained in the same manner as in Example 1, except that the material for component (C) was not used.
  • the thickness of the anisotropic light-diffusing film a was 40 ⁇ m, and the average height of the columnar structures was 40 ⁇ m.
  • Comparative Example 2 An anisotropic light-diffusing film b of Comparative Example 2, which was a single-layer anisotropic light-diffusing layer b, was obtained in the same manner as in Example 2, except that the material for component (C) was not used.
  • the thickness of the anisotropic light-diffusing film b was 40 ⁇ m, and the average height of the columnar structures was 40 ⁇ m.
  • Comparative Example 3 An anisotropic light-diffusing film c of Comparative Example 3, which was a single-layer anisotropic light-diffusing layer c, was obtained in the same manner as in Example 1, except that component (C) was changed to 20 parts by weight of a styrene-isoprene-styrene (SIS) copolymer (manufactured by Kuraray Co., Ltd., trade name: Hybler (registered trademark) 5127, glass transition temperature: 8°C).
  • the thickness of the anisotropic light-diffusing film c was 40 ⁇ m, and the average height of the columnar structures was 40 ⁇ m.
  • a cross section of the film was formed using a microtome and observed under an optical microscope. On the cross section, the length between the surface of the film and the opposite surface in the direction perpendicular to the film plane (thickness direction) was measured at 10 points. The average of the measured values obtained at this time was taken as the thickness of the anisotropic light-diffusing layer film.
  • the anisotropic light-diffusing layer (anisotropic light-diffusing film) was placed horizontally with one surface facing downward and the other surface facing upward, and the heights from the bottom to the top of 20 columnar structures were measured using an optical microscope, and the average value was used as the average height of the columnar structures of the anisotropic light-diffusing layer.
  • Linear transmittance The linear transmittance, which indicates the light diffusion properties of the anisotropic light-diffusing films of the examples and comparative examples, was evaluated using a variable angle goniophotometer (manufactured by Genesia) that can arbitrarily change the projection angle of the light source and the receiving angle of the detector, as shown in Figure 7. 7 , a sample 110 of each anisotropic light-diffusing film of the Examples and Comparative Examples was placed between a light source 201 and a detector 202. Here, the light source 201 and the detector 202 were both fixed.
  • the incident angle of light I from the light source 201 was defined as 0° when it was incident from the normal direction of the anisotropic light-diffusing film, and the anisotropic light-diffusing film was placed so that it could be arbitrarily rotated about a central axis L in a direction perpendicular to both the MD direction and the thickness direction of the anisotropic light-diffusing film (hereinafter referred to as the TD direction).
  • the anisotropic light-diffusing films of the Examples and Comparative Examples were rotated continuously in 1° increments within the range of -75° to 75°, and the amount of light transmitted in the linear direction (linear transmitted light amount) at each incident light angle was measured.
  • the linear transmitted light amount was measured by measuring wavelengths in the visible light range using a visibility filter. The linear transmitted light amount was then calculated as the ratio of the linear transmitted light amount (amount of incident light, incident light amount) irradiated directly from the light source 201 to the detector 202 without passing through the anisotropic light-diffusing film, to the linear transmitted light amount. In the present invention, the linear transmittance was measured at angles of 0°, 15°, and 45°.
  • Each anisotropic light-diffusing film of the Examples and Comparative Examples was held for 10 minutes or more at temperatures of -15°C, 25°C, and 60°C. Subsequently, each anisotropic light-diffusing film of the Examples and Comparative Examples held at each temperature was bent 180° while one end of the film was aligned with a ⁇ 2 mm stainless steel cylindrical rod and then returned to its original flat shape. The condition of each anisotropic light-diffusing film of the Examples and Comparative Examples at this time (presence or absence of cracks or wrinkles) was visually confirmed.
  • a leveling agent (trade name: PC4100, manufactured by DIC Corporation, solids content: 10%) were mixed and diluted with a toluene/cyclopentanone (CPN) mixed solvent (weight ratio: 70/30) to prepare a composition for an antiglare layer having a solids concentration of 32% by weight.
  • CPN toluene/cyclopentanone
  • composition for an antiglare layer was applied to a triacetyl cellulose film (manufactured by Konica Minolta Opto, Inc., product name: KC8UX2M, thickness: 80 ⁇ m) as a light-transmitting substrate using a Comma Coater (registered trademark), heated at 80°C for 1 minute, and then irradiated with ultraviolet light from a high-pressure mercury lamp at an integrated light intensity of 300 mJ/ cm2 , thereby obtaining an antiglare layer laminate in which an antiglare layer (thickness: 5 ⁇ m) was formed on the light-transmitting substrate.
  • a triacetyl cellulose film manufactured by Konica Minolta Opto, Inc., product name: KC8UX2M, thickness: 80 ⁇ m
  • a Comma Coater registered trademark
  • the haze value of the antiglare layer of the prepared antiglare layer laminate was measured in accordance with JIS K7136-1:2000 using a haze meter (product name: NDH-2000) manufactured by Nippon Denshoku Industries Co., Ltd., and the internal haze was 1.5% and the external haze was 25%.
  • the arithmetic mean roughness (Ra) was measured in accordance with JIS B0601:2013 using a surface roughness measuring instrument (product name: Surfcorder SE500) manufactured by Kosaka Laboratory Co., Ltd., and the result was 0.35 ⁇ m.
  • a transparent adhesive layer with a PET film 100 parts by weight of an acrylic adhesive (manufactured by Soken Chemical & Engineering Co., Ltd., trade name: SK Dyne (registered trademark) 1811L) and 0.45 parts by weight of a curing agent (manufactured by Soken Chemical & Engineering Co., Ltd., trade name: L-45) were mixed in a solvent of 15 parts by weight of toluene and 4 parts by weight of ethyl acetate to obtain a coating liquid.
  • an acrylic adhesive manufactured by Soken Chemical & Engineering Co., Ltd., trade name: SK Dyne (registered trademark) 1811L
  • a curing agent manufactured by Soken Chemical & Engineering Co., Ltd., trade name: L-45
  • This coating liquid was applied to a 100 ⁇ m thick PET film (manufactured by Toyobo Co., Ltd., trade name: A4360) using an applicator to obtain a coating film, and then this coating film was dried in a clean oven with the drying oven temperature set to 80 ° C. to obtain a transparent adhesive layer with a PET film and a film thickness of 15 ⁇ m.
  • the total light transmittance of the prepared transparent adhesive layer with PET film was measured using a haze meter (product name: NDH-2000) manufactured by Nippon Denshoku Industries Co., Ltd. in accordance with JIS K7361-1:1997, and was found to be 91%.
  • the present invention provides an anisotropic light-diffusing film that does not develop defects such as cracks or wrinkles even when used at temperatures between -15°C and 60°C in displays that require bending or in curved windows, as well as a display film and a display using the film.
  • 1...antiglare layer 1a...first surface, 1b...second surface, 3...anisotropic light-diffusing film, 5...light-transmitting substrate, 7...transparent adhesive layer, 9...antiglare layer laminate, 10, 11, 12...display film, 30...anisotropic light-diffusing layer, 31...matrix region, 32...columnar region, 33...columnar structure, 110...sample, 201...light source, 202...detector, 300...light source, 301, 302...directional diffusion element, 303...uncured resin composition layer.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

Un film de diffusion de lumière anisotrope (3) selon la présente invention comprend une couche de diffusion de lumière anisotrope (30) formée à partir de la photopolymérisation d'une composition contenant un composé photopolymérisable, un initiateur de photopolymérisation et au moins un plastifiant parmi des plastifiants esters, des plastifiants époxy et des plastifiants caoutchouc liquide, la couche de diffusion de lumière anisotrope (30) ayant une région de matrice (31) et une région en colonne (32) comprenant une pluralité de structures en colonne (33) ayant des indices de réfraction différents de ceux de la région de matrice (31).
PCT/JP2025/016324 2024-04-30 2025-04-30 Film de diffusion de lumière anisotrope, film pour affichage l'utilisant, et dispositif d'affichage Pending WO2025229974A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2024-073990 2024-04-30
JP2024073990 2024-04-30

Publications (1)

Publication Number Publication Date
WO2025229974A1 true WO2025229974A1 (fr) 2025-11-06

Family

ID=97561478

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2025/016324 Pending WO2025229974A1 (fr) 2024-04-30 2025-04-30 Film de diffusion de lumière anisotrope, film pour affichage l'utilisant, et dispositif d'affichage

Country Status (1)

Country Link
WO (1) WO2025229974A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008268417A (ja) * 2007-04-18 2008-11-06 Konica Minolta Opto Inc 異方性散乱素子、偏光板および液晶表示装置
WO2014084361A1 (fr) * 2012-11-29 2014-06-05 株式会社巴川製紙所 Film optique anisotrope
JP2018131493A (ja) * 2017-02-14 2018-08-23 東洋インキＳｃホールディングス株式会社 表面保護用粘着剤および表面保護シート
WO2018180541A1 (fr) * 2017-03-31 2018-10-04 株式会社巴川製紙所 Film antireflet et dispositif d'affichage
JP2021080360A (ja) * 2019-11-19 2021-05-27 旭化学合成株式会社 ホットメルト組成物およびホットメルト接着剤

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008268417A (ja) * 2007-04-18 2008-11-06 Konica Minolta Opto Inc 異方性散乱素子、偏光板および液晶表示装置
WO2014084361A1 (fr) * 2012-11-29 2014-06-05 株式会社巴川製紙所 Film optique anisotrope
JP2018131493A (ja) * 2017-02-14 2018-08-23 東洋インキＳｃホールディングス株式会社 表面保護用粘着剤および表面保護シート
WO2018180541A1 (fr) * 2017-03-31 2018-10-04 株式会社巴川製紙所 Film antireflet et dispositif d'affichage
JP2021080360A (ja) * 2019-11-19 2021-05-27 旭化学合成株式会社 ホットメルト組成物およびホットメルト接着剤

Similar Documents

Publication Publication Date Title
TWI760456B (zh) 防眩性薄膜及顯示裝置
KR101154807B1 (ko) 방현성 코팅 조성물, 방현 필름 및 그의 제조방법
KR101931212B1 (ko) 광학 필름, 방현성 필름 및 편광판
KR102743108B1 (ko) 헤드 마운트 디스플레이
JP5888864B2 (ja) アクリル系樹脂フィルム及びこれを用いた偏光板並びにアクリル系樹脂フィルムの製造方法
JP5232448B2 (ja) 防眩材料
JP2009075248A (ja) 防眩性ハードコートフィルム及びその製造方法
TW201702056A (zh) 異方性光學膜之製造方法
JP2016218478A (ja) アクリル系樹脂フィルム及び偏光板
JP7475333B2 (ja) 異方性光学フィルムを用いた反射型表示装置
JP2009048092A (ja) 光学積層体
JP2013092782A (ja) 光学積層体
JP6542007B2 (ja) 異方性光学フィルム及びその製造方法
JP7092962B1 (ja) 異方性光学フィルム用組成物及び異方性光学フィルム
KR102046200B1 (ko) 에지라이트형 백라이트장치 및 광확산성 부재
KR20150079052A (ko) 유기 입자의 표면 특성을 갖춘 방현 필름
JP7191537B2 (ja) 異方性光学フィルム
WO2025229974A1 (fr) Film de diffusion de lumière anisotrope, film pour affichage l'utilisant, et dispositif d'affichage
WO2025229972A1 (fr) Film de diffusion de lumière anisotrope, film d'affichage l'utilisant et dispositif d'affichage
WO2025229973A1 (fr) Film de diffusion de lumière anisotrope, film pour affichage l'utilisant, et dispositif d'affichage
WO2022209566A1 (fr) Film de diffusion de lumière anisotrope et dispositif d'affichage
JP6009013B2 (ja) 積層体の製造方法及びアクリル系樹脂フィルムの製造方法
JP7744934B2 (ja) 異方性光学フィルム用組成物及び異方性光学フィルム
WO2019220775A1 (fr) Visiocasque
WO2022209567A1 (fr) Ffilm de diffusion de lumière anisotrope et dispositif d'affichage