CN111602073A - Anti-dazzle film - Google Patents
Anti-dazzle film Download PDFInfo
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- CN111602073A CN111602073A CN201980008569.3A CN201980008569A CN111602073A CN 111602073 A CN111602073 A CN 111602073A CN 201980008569 A CN201980008569 A CN 201980008569A CN 111602073 A CN111602073 A CN 111602073A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
- G02B1/111—Anti-reflection coatings using layers comprising organic materials
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
Abstract
The invention provides an anti-dazzle film which has excellent anti-dazzle performance, is not easy to generate dazzling and can be used for high-definition. The above problems can be solved by the following antiglare film: an anti-glare film (1) comprising a base film (10) and an anti-glare layer (11) on at least one surface of the base film, wherein the anti-glare layer (11) comprises a base resin (12), particles A having a refractive index difference from the base resin (12) of 0.02 or more and a density exceeding 0.90 times the density of the base resin (12), and particles B having a density not greater than 0.90 times the density of the base resin (12). By using polyolefin particles having a low density as the particles B, precipitation of the particles B can be prevented, and the above-mentioned problems can be easily solved.
Description
Technical Field
The present invention relates to an anti-glare film, and more particularly, to an anti-glare film in which glare (ギラツキ) and anti-glare properties can be significantly improved by using specific 2-type particles.
Background
Conventionally, in display devices such as liquid crystal displays, CRT displays, EL displays, and plasma displays, an antiglare film having an uneven structure on the surface thereof has been provided on the surface of the display in order to prevent background reflection (see り Write み) of fluorescent lamps, external light, and the like.
As such an antiglare film, various ones having an uneven structure formed on the surface by dispersing fine particles in a transparent base resin are known (for example, patent documents 1 to 3).
The antiglare film exhibits hard coatability by using an ultraviolet curable resin or the like as a base resin, and can be used as a protective film of a polarizing plate or the like.
In recent years, high-definition display devices having a small pixel size have been developed to improve image quality. In the display of such a high-definition display device, the uneven structure on the surface of the antiglare film is likely to be a bright spot, and the problem of "glare" (uneven brightness) of the screen is likely to occur.
Patent document 2 discloses an antiglare film in which the surface haze value (external haze value) and the internal haze value of the antiglare layer are set within specific ranges, and the example of patent document 2 shows that the background reflection is large (antiglare property is poor) when the surface haze value is small, and surface glare (glare) is easily generated when the internal haze value is small, but does not show a specific criterion for setting the haze value within a specific range.
In addition, in patent document 3, by defining the total haze value of the antiglare hard coat film, the value obtained by dividing the internal haze value by the total haze value, the surface roughness of the surface of the antiglare hard coat layer, and the like, it is possible to cope with all of the problems of high contrast, securing antiglare property, preventing white blur, and coping with high definition, which are originally contradictory problems. However, in patent document 3, a specific means for achieving a desired haze value and surface shape is not clear.
In order to cope with high definition, a display device having excellent visibility is required, and development of a high-performance antiglare film for realizing the display device is urgently desired.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 6-018706
Patent document 2: japanese laid-open patent publication No. 11-305010
Patent document 3: japanese patent laid-open publication No. 2013-178533
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made in view of the above-mentioned background art, and an object thereof is to provide an antiglare film which is excellent in antiglare properties, is less prone to glare, and can cope with high definition.
Means for solving the problems
The present inventors have made extensive studies to solve the above problems, and as a result, have found that when an antiglare film is produced by using a combination of particles a for internal diffusion having a specific refractive index difference from a base resin of an antiglare layer and particles B for external diffusion being lighter than the base resin, the internal diffusion and the external diffusion can be individually designed, and both antiglare properties and glare prevention can be improved, thereby completing the present invention.
That is, the present invention provides an antiglare film comprising a base resin, particles a having a refractive index difference of 0.02 or more from the base resin and a density of more than 0.90 times the density of the base resin, and particles B having a density of 0.90 times or less the density of the base resin, the antiglare film being characterized in that an antiglare layer is provided on at least one surface of a base film.
Effects of the invention
According to the present invention, an antiglare film which is excellent in antiglare properties, is less likely to cause glare, and can be used for high definition can be provided.
In particular, since the particles B included in the antiglare layer of the present invention have a low density, they tend to float on the surface of the antiglare layer even when an additive such as a precipitation preventing agent is not used. The particles floating on the surface of the antiglare layer contribute to formation of an uneven structure on the surface, and improve antiglare properties.
Unlike the particles B, the particles a contained in the antiglare layer of the present invention are uniformly present in the base resin without floating on the surface, and contribute to internal diffusion.
In the present invention, as described above, since 2 types of particles having different functions are used for the antiglare layer, internal diffusion and external diffusion can be individually designed, and an antiglare film having both antiglare properties and glare suppression can be obtained.
The antiglare film of the present invention can suppress glare and can obtain sufficient hardness, and therefore is suitable for use as a protective film for a polarizing plate such as a liquid crystal display.
Drawings
Fig. 1 is a schematic view showing a cross-sectional structure of an antiglare film of the present invention.
Fig. 2 is a cross-sectional SEM photograph of the antiglare film produced in experimental example 1.
Fig. 3 is a cross-sectional SEM photograph of the antiglare film produced in experimental example 2.
Fig. 4 is a cross-sectional SEM photograph of the antiglare film produced in experimental example 3.
Fig. 5 is a cross-sectional SEM photograph of the antiglare film produced in experimental example 5.
Detailed Description
The present invention will be described below, but the present invention is not limited to the following embodiments and can be implemented in any modification.
The antiglare film 1 of the present invention is an antiglare film having an antiglare layer 11 on at least one surface of a substrate film 10 (fig. 1 shows an example in which the antiglare layer 11 is provided on only one surface).
The antiglare layer 11 contains a base resin 12, particles a having a refractive index difference of 0.02 or more from the base resin 12 and a density exceeding 0.90 times the density of the base resin 12, and particles B having a density of 0.90 times or less the density of the base resin 12.
The surface 11a of the antiglare layer has an uneven structure, and antiglare properties can be exhibited by surface diffusion (the uneven structure is exaggeratedly depicted in fig. 1).
The base film 10 is a base for supporting the antiglare layer 11 thereon, and a transparent plastic film, a glass plate, or the like can be suitably used.
Specific materials of the base film 10 include polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyarylate, polyethylene, polypropylene, cyclic polyolefin, polystyrene, triacetyl cellulose (TAC), diacetyl cellulose, poly (meth) acrylate, polyvinyl chloride, polyimide, polyamide, norbornene compounds, glass, and the like.
The average thickness of the base film 10 is not particularly limited, but is preferably 25 μm to 500 μm, and particularly preferably 50 μm to 300 μm from the viewpoints of strength for use as an antiglare film, ease of handling, cost, and the like.
As the substrate film 10, a substrate film subjected to an easy adhesion treatment such as a plasma treatment, a corona discharge treatment, a far ultraviolet irradiation treatment, or formation of an undercoat easy adhesion layer can be used.
The antiglare layer 11 contains, as essential components, a base resin 12, particles a having a refractive index difference with the base resin 12 of 0.02 or more, and particles B having a density of 0.90 times or less the density of the base resin 12.
The "base resin 12" in the present invention refers to all of the components (resins) of the material for forming the coating film (antiglare layer) except the particles (particles a, particles B, and other particles) and additives described later.
The base resin 12 may be used alone in 1 kind, or 2 or more kinds may be used in combination.
The antiglare layer 11 is formed by dispersing or dissolving particles (particles a, particles B, other particles) and additives described later in the base resin 12, and drying and/or curing the base resin 12.
The base resin 12 preferably contains an active ray-curable resin from the viewpoint of imparting scratch resistance to the antiglare layer 11. The base resin 12 preferably contains a thermoplastic resin from the viewpoint of improving the dispersibility of the particles. Further, the base resin 12 particularly preferably contains both an active ray-curable resin and a thermoplastic resin.
The active ray-curable resin that the base resin 12 of the antiglare layer 11 of the present invention may contain is a resin that is cured by a crosslinking reaction or the like through irradiation of active rays such as ultraviolet rays (UV) and Electron Beams (EB) with an active ray-curable resin raw material containing an uncured active ray-curable resin (prepolymer), a photopolymerizable monomer, or the like.
Among them, an ultraviolet-curable resin which is cured by ultraviolet rays is particularly preferable from the viewpoint of scratch resistance, cost, and availability of an uncured active ray-curable resin (prepolymer) as a raw material.
The active ray-curable resin used as a raw material may be used alone in 1 kind, or 2 or more kinds may be used in combination.
Specific examples of the active ray-curable resin include resins obtained by curing (meth) acrylic prepolymers and the like (in the present specification, "(meth) acrylic acid" means "acrylic acid" or "methacrylic acid", and "(meth) acrylate" means "acrylate" or "methacrylate").
The (meth) acrylic prepolymer is a photopolymerizable prepolymer which can be crosslinked and cured by irradiation with active rays, has 2 or more acryloyl groups in 1 molecule, and has a 3-dimensional network structure by crosslinking and curing.
The kind of the (meth) acrylic prepolymer is not particularly limited, and urethane (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, melamine (meth) acrylate, polyfluoroalkyl (meth) acrylate, silicone (meth) acrylate, and the like can be used.
These may be used alone in 1 kind, or 2 or more kinds may be used in combination.
When the active ray-curable resin raw material contains the above (meth) acrylic prepolymer as a main component, a photopolymerizable monomer may be added to the active ray-curable resin raw material.
Addition of a photopolymerizable monomer is preferable because crosslinking curability can be improved and hardness of the antiglare layer can be further improved.
Examples of the photopolymerizable monomer include monofunctional (meth) acrylic monomers such as 2-ethylhexyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and butoxyethyl (meth) acrylate; 2-functional acrylic monomers such as 1, 6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, hydroxypivalate neopentyl glycol di (meth) acrylate, and the like; and polyfunctional (meth) acrylic monomers such as pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, trimethylolpropane tri (meth) acrylate, and pentaerythritol tri (meth) acrylate.
These may be used alone in 1 kind, or 2 or more kinds may be used in combination.
The active ray-curable resin material preferably contains a photopolymerization initiator and a photopolymerization accelerator for the purpose of curing reaction.
Specific examples of the photopolymerization initiator include acetophenone, benzophenone, michael's ketone, benzoin, benzyl methyl ketal, benzoyl benzoate, a-acyloxime ester, thioxanthone and the like.
The photopolymerization accelerator can reduce polymerization inhibition by oxygen during curing and accelerate the curing rate, and examples thereof include isoamyl p-dimethylaminobenzoate and ethyl p-dimethylaminobenzoate.
Among the active ray-curable resins, organic-inorganic hybrid resins are particularly preferably used.
The "organic-inorganic hybrid resin" refers to a resin obtained by combining an organic component and an inorganic component at a nano level. Unlike conventional composites represented by glass Fiber Reinforced Plastics (FRP), organic-inorganic hybrid resins are capable of synergistically improving the properties and functions of organic components and inorganic components because the organic components and inorganic components are intimately mixed and dispersed at or near the molecular level.
The organic-inorganic hybrid resin may be one in which the organic component and the inorganic component are already combined before curing, or one in which the inorganic component and the organic component are reacted by irradiation with active rays.
The size of the inorganic component in the organic-inorganic hybrid resin is set to 800nm or less at which geometric scattering of light does not occur, and when particles are used, particles having an average particle diameter of 800nm or less are used. The inorganic component includes metal oxides such as silica and titania, and silica is preferable. The silica is more preferably a reactive silica having a surface to which a photosensitive group having photopolymerization reactivity is introduced.
In the present specification, the "average particle diameter" of the particles refers to a value of a volume average particle diameter (D50) that can be measured by a laser diffraction/scattering method. The average particle diameter when the particle shape is not spherical is calculated as the equivalent spherical diameter.
The content of the inorganic component in the organic-inorganic hybrid resin is preferably 10% by mass or more, and more preferably 20% by mass or more. Further, it is preferably 65% by mass or less, more preferably 40% by mass or less.
Examples of the organic component in the organic-inorganic hybrid resin include compounds having a polymerizable unsaturated group which is polymerizable with the inorganic component (preferably, reactive silica) (for example, a polyunsaturated organic compound having 2 or more polymerizable unsaturated groups in the molecule, a monounsaturated organic compound having 1 polymerizable unsaturated group in the molecule, and the like).
When the base resin 12 of the antiglare layer 11 contains an organic-inorganic hybrid resin, it is considered that the particles B described later, which float on the surface of the antiglare layer 11 and contribute to external diffusion, more easily float, and therefore the effect of the present invention is particularly easily achieved.
The base resin 12 of the antiglare layer 11 of the present invention may also contain a thermoplastic resin. By containing the thermoplastic resin, the dispersibility of the particles (particularly, the particles a) in the base resin 12 is easily improved. Further, the particle surface is covered with the resin component, and unevenness is easily formed on the coating film surface.
Specific examples of the thermoplastic resin include polyvinyl acetal resins such as polyvinyl butyral and polyvinyl formal; a polyester resin; a (meth) acrylic resin; polyolefin resins such as polyethylene and polypropylene.
The thermoplastic resin can be used alone in 1 kind, can also be combined with more than 2 kinds.
When the base resin 12 contains both the active ray-curable resin and the thermoplastic resin, the content ratio of the thermoplastic resin is preferably 1 part by mass or more, more preferably 2 parts by mass or more, and particularly preferably 3 parts by mass or more, based on 100 parts by mass of the active ray-curable resin. The thermoplastic resin is preferably 30 parts by mass or less, more preferably 20 parts by mass or less, and particularly preferably 10 parts by mass or less, per 100 parts by mass of the active ray-curable resin.
When the content is not less than the lower limit, the particle surface is covered with the resin component, and the antiglare property and the effect of preventing glare are easily improved. When the upper limit is less than the upper limit, the base resin 12 is sufficiently cured, and the antiglare layer 11 having sufficient hardness is easily obtained.
The refractive index of the base resin 12 is preferably 1.40 or more, more preferably 1.45 or more, and particularly preferably 1.50 or more. Further, it is preferably 1.8 or less, more preferably 1.75 or less, and particularly preferably 1.7 or less.
The "refractive index of the base resin 12" means a refractive index of only a portion of the base resin 12 where no particles are present in the antiglare layer after the coating film (antiglare layer) is formed. In the case where an organic-inorganic hybrid resin is used as the "base resin 12", the inorganic component of the organic-inorganic hybrid resin is included in the "refractive index and density of the base resin 12".
The density of the base resin 12 is preferably 1.1g/cm3Above, more preferably 1.15g/cm3Above, particularly preferably 1.2g/cm3The above. And, preferably, 1.7g/cm3Below, more preferably 1.65g/cm3Below, 1.6g/cm is particularly preferable3The following.
The "density of the base resin 12" means the density of a portion of the antiglare layer forming material where only the base resin 12 is not present with particles, a solvent, or the like, before the coating film (antiglare layer) is formed. When a resin that is cured by a reaction with heat, active rays, or the like is used as the "base resin 12", the density before curing is defined as the "density of the base resin 12". In the case where an organic-inorganic hybrid resin is used as the "base resin 12", the inorganic component of the organic-inorganic hybrid resin is included in the "density of the base resin 12".
The antiglare layer 11 of the present invention contains particles a having a refractive index difference of 0.02 or more from the base resin 12 and a density of more than 0.90 times the density of the base resin 12 (that is, particles having a refractive index difference of 0.02 or more from the base resin 12 excluding the particles B described later). The particles a have a specific refractive index difference from the base resin 12, and therefore contribute to internal diffusion and affect the internal haze value.
The difference in refractive index between the particles a and the base resin 12 is 0.02 or more, preferably 0.03 or more, more preferably 0.05 or more, further preferably 0.1 or more, particularly preferably 0.15 or more, and most preferably 0.2 or more. Further, it is preferably 0.5 or less, more preferably 0.48 or less, further preferably 0.46 or less, particularly preferably 0.43 or less, and most preferably 0.4 or less.
When the amount is within the above range, the internal haze value can be easily set to an appropriate range, and the antiglare property of the antiglare layer 11 can be easily improved.
The refractive index of the particles a and the base resin 12 may be larger.
The density of the particles a is preferably 0.95 times or more, more preferably 1.0 times or more the density of the base resin 12.
When the amount is within the above range, the particles a are easily uniformly dispersed in the coating film, and the internal haze can be more efficiently obtained.
The kind of the particles A (used as a raw material of the particles A) is not particularly limited, and examples thereof include melamine resin (refractive index: 1.66, density: 1.50 g/cm)3) Benzoguanamine resin (refractive index: 1.66, density: 1.40g/cm3) Particles of amino resins such as urea resins; silica particles (refractive index: 1.46, density: 2.20 g/cm)3) (ii) a Silicone particles (refractive index: 1.42, density: 1.32 g/cm)3) (ii) a Talc (refractive index: 1.56, density: 2.70 g/cm)3) (ii) a Acrylic-styrene particles (refractive index: 1.56, density: 1.20 g/cm)3) And the like.
When the active ray curable resin and the thermoplastic resin are used together in the above preferred ratio range, the refractive index of the base resin 12 is likely to be about 1.4 to 1.6.
The particles a may be organic particles or inorganic particles, but organic particles are preferably used because they have higher affinity with the base resin than inorganic particles and are easily dispersed uniformly in the coating film.
When the particles a are particles of an amino resin having a high refractive index as organic particles, the difference in refractive index between the particles a and the base resin 12 can be easily set to the above range, and the above effects can be easily obtained.
As the particles a, 1 kind of particles may be used alone, or 2 or more kinds may be used in combination.
The distribution of the particles a in the antiglare layer 11 is not particularly limited, but the particles a are particles contributing to internal diffusion, and therefore are desirably uniformly dispersed in the antiglare layer 11 (as described later, the particles B are desirably present in a concentrated manner in the vicinity of the surface of the antiglare layer 11).
The average particle diameter of the particles A is not particularly limited, but is preferably 0.8 μm or more, more preferably 1.0 μm or more, and particularly preferably 1.2 μm or more. Furthermore, it is preferably 3 μm or less, more preferably 2.5 μm or less, and particularly preferably 2 μm or less.
When the average particle diameter is within the above range, the particles a are easily uniformly dispersed in the antiglare layer 11, the internal haze value is easily set in an appropriate range, and the antiglare property is easily improved.
The shape of the particles a is not particularly limited. When the shape of the particles a is not spherical, the average particle diameter is an equivalent spherical diameter.
The antiglare layer 11 of the present invention contains particles B having a density of 0.90 times or less the density of the base resin 12. The particles B have a density lower than that of the base resin 12 (because they are lighter) and tend to float near the surface of the antiglare layer 11. The particles B influence the shape of the uneven structure on the surface 11a of the antiglare layer, and are presumed to contribute to external diffusion.
Since the particles B are lighter than the base resin 12 and tend to float, they are generally assumed to be present in a relatively heavy manner in the vicinity of the surface 11a of the antiglare layer, as shown in fig. 1.
The density of the particles B is 0.90 times or less, preferably 0.85 times or less, more preferably 0.8 times or less, and particularly preferably 0.7 times or less the density of the base resin 12.
When the particle size is within the above range, the particles B are likely to float, and the antiglare property is likely to be improved by formation of an uneven structure on the surface.
The kind of the particles B (used as a raw material of the particles B) is not particularly limited, and examples thereof include polyethylene (density: 0.94 g/cm)3) Polypropylene (density: 0.91g/cm3) Polyolefin particles such as ethylene-propylene copolymers and propylene-butene copolymers; polystyrene (density: 1.05 g/cm)3) Particles, and the like.
The polyolefin particles are particularly preferable as the particles B because they have a low density and are easily floated, and the scratch resistance of the antiglare layer is easily improved.
The density of the particles B is preferably 0.6g/cm3Above, particularly preferably 0.7g/cm3The above. And, preferably, 1.2g/cm3Below, 1.0g/cm is particularly preferable3The following.
As the particles B, 1 kind of particles may be used alone, or 2 or more kinds may be used in combination.
The average particle diameter of the particles B is not particularly limited, but is preferably 1 μm or more, more preferably 1.5 μm or more, and particularly preferably 2 μm or more. Further, it is preferably 7 μm or less, more preferably 5 μm or less, and particularly preferably 4 μm or less.
The average particle diameter of the particles B is preferably 0.1 times or more, more preferably 0.3 times or more, and particularly preferably 0.5 times or more the average layer thickness of the antiglare layer 11.
Further, the amount is preferably 1 time or less, more preferably 0.95 time or less, and particularly preferably 0.9 time or less.
When the average particle diameter is within the above range, the particles B easily float in the antiglare layer 11, and external diffusion is easily controlled.
The shape of the particles B is not particularly limited. When the shape of the particles B is not spherical (this is preferable), the average particle diameter is an equivalent spherical diameter.
The particles B are preferably amorphous particles from the viewpoint of antiglare properties.
The content ratio of the particles a to the particles B is preferably 0.2 parts by mass or more, more preferably 0.3 parts by mass or more, and particularly preferably 0.4 parts by mass or more, based on 1 part by mass of the particles B. The amount of the particles a is preferably 2 parts by mass or less, more preferably 1.5 parts by mass or less, and particularly preferably 1 part by mass or less, based on 1 part by mass of the particles B.
When the amount is within the above range, the particles B are likely to float on the surface.
The total ratio of the particles a and the particles B contained in the antiglare layer 11 is preferably 1 mass% or more, and particularly preferably 3 mass% or more, with respect to the entire antiglare layer 11 (solid content).
Further, it is preferably 15% by mass or less, and particularly preferably 10% by mass or less.
The antiglare layer 11 may contain other particles not belonging to the particles a and not belonging to the particles B within a range not impairing the effects and performances of the present invention. The total ratio of the particles a and the particles B is preferably 70% by mass or more, more preferably 90% by mass or more, and particularly preferably 100% by mass or more, with respect to the total particles (that is, other particles not belonging to the particles a and not belonging to the particles B are not included).
The inorganic component contained in the organic-inorganic hybrid resin is not contained in the "whole particles".
In the conventional technique, when a base resin in which fine particles are dispersed is dried and cured to form a coating film (antiglare layer), the fine particles may precipitate in the antiglare layer, and an uneven structure may not be sufficiently formed on the surface of the antiglare layer. In the present invention, by using the particles B having a low density, an uneven structure that can sufficiently contribute to external diffusion can be formed on the surface of the antiglare layer without separately adding a precipitation inhibitor.
The antiglare layer 11 of the present invention may contain other particles (particles other than the particles a and B) as needed; additives such as lubricants, fluorescent whitening agents, pigments, dyes, antistatic agents, flame retardants, antibacterial agents, antifungal agents, antioxidants, plasticizers, leveling agents, flow control agents, antifoaming agents, dispersants, crosslinking agents, light stabilizers, and the like.
In the production of the antiglare film 1 of the present invention, an antiglare layer forming liquid containing a base resin, the particles a and the particles B, and if necessary, the other components, a solvent, and the like is applied onto a base film 10, and dried and cured to form an antiglare layer 11.
The antiglare layer forming liquid is a liquid obtained by dispersing/dissolving components such as particles (particles a and particles B).
In general, the active ray-curable resin is a liquid, but a solvent (such as an organic solvent) may be contained in the antiglare layer-forming liquid. When the thermoplastic resin is contained, the solvent is preferably contained.
Examples of such a solvent include toluene, xylene, methyl ethyl ketone, ethyl acetate, butyl acetate, ethyl alcohol, isopropyl alcohol, butyl alcohol, and the like.
The solvent can be used alone in 1 kind, also can be combined with more than 2 kinds.
The antiglare layer forming liquid may be prepared by directly mixing the components contained in the antiglare layer 11, or may be prepared by preparing a dispersion/solution in advance in which the components are dispersed/dissolved, and mixing the dispersion/solution to prepare an antiglare layer forming liquid.
The method of applying the antiglare layer forming liquid to the base film 10 may be a conventionally known method. For example, coating can be performed using a bar coater, a die coater, a knife coater, a spin coater, a roll coater, a gravure coater, a flow coater (curtain coater), a spray coater, screen printing, or the like.
When the antiglare layer forming liquid contains an active ray-curable resin, the antiglare layer 11 can be obtained by drying the liquid if necessary and then curing the liquid by irradiation with active rays.
Examples of the method of irradiating with active radiation include a method of irradiating with ultraviolet rays in a wavelength region of 100nm to 400nm, preferably 200nm to 400nm, emitted from an ultra-high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a metal halide lamp, or the like, and a method of irradiating with electron beams in a wavelength region of 100nm or less emitted from a scanning type or curtain type electron beam accelerator.
The thickness (average layer thickness; H in FIG. 1) of the antiglare layer 11 is not particularly limited, but is preferably 2 μm or more, and particularly preferably 3 μm or more. Further, it is preferably 10 μm or less, particularly preferably 7 μm or less.
When the lower limit is not less than the above limit, sufficient hardness can be exhibited. When the amount is not more than the upper limit, curling is less likely to occur.
Examples
The present invention will be described in more detail below by way of examples and comparative examples, but the present invention is not limited to these examples as long as the gist of the present invention is not exceeded.
[ Experimental example 1]
An antiglare layer having an average thickness of 4.5 μm was formed by applying an antiglare layer forming liquid 1 having the following formulation on the other surface of a transparent TAC (triacetyl cellulose) film having a thickness of 80 μm, drying, and irradiating with ultraviolet light to form an antiglare layer.
The density and refractive index of the material of the liquid composition mean the density and refractive index of only the solid component excluding the solvent, respectively.
< composition of antiglare layer-Forming liquid 1 >
< measurement of haze >
First, the haze value of the produced antiglare film and the haze value of the base film (transparent TAC film) on which the antiglare layer was not formed were measured in accordance with JIS K7136.
The haze value of the base film (transparent TAC film) was subtracted from the haze value of the produced antiglare film to obtain a value as a total haze value.
Next, a transparent pressure-sensitive adhesive sheet having a thickness of 20 μm was attached to the anti-glare layer side of the anti-glare film, and used as a sample for calculating an internal haze value. The haze value of the transparent pressure-sensitive adhesive sheet and the haze value of the internal haze value calculation sample were measured in accordance with JIS K7136.
Then, the haze value of the transparent adhesive sheet and the haze value of the base film (transparent TAC film) were subtracted from the haze value of the internal haze value calculation sample to obtain a value as an internal haze value.
Finally, a value obtained by subtracting the internal haze value from the total haze value is taken as an external haze value.
Since the haze value of the transparent pressure-sensitive adhesive sheet is subtracted in the calculation process described above, the haze value of the transparent pressure-sensitive adhesive sheet does not directly affect the internal haze value, the external haze value, and the total haze value, but from the viewpoint of improving the measurement accuracy, a transparent pressure-sensitive adhesive sheet having a haze value of less than 5% is used.
< Observation of Cross-sectional SEM photograph >
The cross section of the antiglare film thus produced was observed with a scanning electron microscope.
< eye irritation test >
The entire screen of a flat PC (224 dpi) of a high-definition display is displayed in green, and the antiglare film thus produced is placed thereon and visually checked for glare. When almost no glare was observed, the evaluation was "good", and when glare was observed, the evaluation was "x".
< anti-glare test >
The surface of the produced antiglare film opposite to the surface coated with the antiglare layer was bonded to a black acrylic plate having a thickness of 3mm via a transparent OCA having a thickness of about 25 μm. Next, the acrylic plate was placed on the side of the antiglare layer, the fluorescent lamp mounted directly above the acrylic plate (about 1m20cm) was turned on, and light was irradiated onto the antiglare layer to determine whether or not the fluorescent lamp was recognized on the antiglare layer. If the image is blurred and cannot be recognized, the image is determined as "O", and if the image is clearly recognized, the image is determined as "X".
[ Experimental example 2]
An antiglare film was produced and evaluated in the same manner as in experimental example 1, except that the antiglare layer forming liquid 1 in experimental example 1 was changed to the antiglare layer forming liquid 2 of the following formulation.
< composition of antiglare layer-Forming liquid 2 >
The UV-curable organic-inorganic hybrid acrylic resin used in the antiglare layer forming liquid 2 is an organic-inorganic hybrid resin of a type that contains reactive nano silica and forms an organic-inorganic composite by UV irradiation.
[ Experimental example 3]
An antiglare film was produced and evaluated in the same manner as in experimental example 1, except that the antiglare layer forming liquid 1 in experimental example 1 was changed to the antiglare layer forming liquid 3 of the following formulation.
< composition of antiglare layer-Forming liquid 3 >
[ Experimental example 4]
An antiglare film was produced and evaluated in the same manner as in experimental example 1, except that the antiglare layer forming liquid 1 in experimental example 1 was changed to the antiglare layer forming liquid 4 of the following formulation.
< composition of antiglare layer-Forming liquid 4 >
[ Experimental example 5]
An antiglare film was produced and evaluated in the same manner as in experimental example 1, except that the antiglare layer forming liquid 1 in experimental example 1 was changed to the antiglare layer forming liquid 5 of the following formulation.
< composition of antiglare layer-Forming liquid 5 >
[ Experimental example 6]
An antiglare film was produced and evaluated in the same manner as in experimental example 1, except that the average thickness of the antiglare layer in experimental example 1 was set to 6.5 μm.
[ Experimental example 7]
An antiglare film was produced and evaluated in the same manner as in experimental example 1, except that the average thickness of the antiglare layer in experimental example 1 was set to 2.0 μm.
[ results ]
The results of the glare test, the antiglare property test, and the haze measurement for experimental examples 1 to 7 are shown in table 1.
Fig. 2 to 5 show SEM photographs of the cross-sections of the antiglare films produced in experimental examples 1 to 3 and 5.
[ Table 1]
The antiglare films of experimental example 1 and experimental example 2, in which 2 types of particles, i.e., the particles a and the particles B, of the present invention were contained in the antiglare layer, had sufficient surface irregularities due to the inclusion of the particles B, and the results of good antiglare properties were obtained. Further, the internal haze value was also a designed value, and therefore, a favorable result was obtained.
On the other hand, the antiglare film of experimental example 3 containing no particle B was poor in antiglare property, and the antiglare film of experimental example 4 containing no particle a was dazzling.
Even if 2 kinds of particles are used, the antiglare film of experimental example 5, in which the antiglare layer was produced using the polymethyl methacrylate particles (particles B') having a high density instead of the particles B of the present invention, had poor antiglare properties.
The thickness of the antiglare film of example 6 was 2.4 times the average particle diameter of the particles B, but good results were also obtained.
The antiglare film of experimental example 7 gave good results, but had an appearance with a film thickness smaller than the average particle diameter of the particles B and a strong granular feeling (many noticeable large irregularities).
As is clear from the SEM photographs of the antiglare films, in the antiglare films of experimental example 1 and experimental example 2 (fig. 2 and fig. 3), the particles B float near the surface of the antiglare layer 11.
On the other hand, in the antiglare film of experimental example 3 (fig. 4) containing only the particles a but not the particles B and the antiglare film of experimental example 5 (fig. 5) using the particles B' having a high density instead of the particles B, no particles are present in the vicinity of the surface of the antiglare layer.
It is presumed that when particles (particles B) having a low density are used in combination with the particles a, the particles B float up in the vicinity of the surface of the antiglare layer 11, and thus the antiglare property and glare of the antiglare film can be improved.
Industrial applicability
The anti-glare film of the present invention is excellent in anti-glare properties, is less likely to cause glare, and can be applied to high definition, and therefore, is widely used for optical members such as polarizing plates, image display devices such as liquid crystal panels and liquid crystal display devices, and the like.
Description of the reference numerals
1 anti-glare film
10 base material film
11 anti-glare layer
11a antiglare layer surface
12 base resin
A particles A
B particles B
B 'particle B' (polymethyl methacrylate particle)
Average layer thickness of H anti-dazzle layer
Claims (9)
1. An antiglare film comprising a base resin, particles A having a refractive index difference of 0.02 or more from the base resin and a density of more than 0.90 times the density of the base resin, and particles B having a density of 0.90 times or less the density of the base resin, wherein an antiglare layer is provided on at least one surface of a base film.
2. The antiglare film according to claim 1, wherein the base resin contains an active ray-curable resin.
3. The antiglare film according to claim 2, wherein the active ray-curable resin is an organic-inorganic hybrid resin.
4. The antiglare film according to any one of claims 1 to 3, wherein the base resin contains a thermoplastic resin.
5. The antiglare film of any one of claims 1 to 4, wherein the particles B are polyolefin particles.
6. The antiglare film of any one of claims 1 to 5, wherein the particles B are amorphous particles.
7. The antiglare film according to any one of claims 1 to 6, wherein an average particle diameter of the particles B is 0.1 times or more and 1 times or less an average layer thickness of the antiglare layer.
8. The antiglare film according to any one of claims 1 to 7, wherein the particles A are particles of an amino resin.
9. The antiglare film of any one of claims 1 to 8, wherein the particles B are present predominantly in the vicinity of the surface of the antiglare layer.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-050633 | 2018-03-19 | ||
| JP2018050633A JP7323986B2 (en) | 2018-03-19 | 2018-03-19 | antiglare film |
| PCT/JP2019/009763 WO2019181615A1 (en) | 2018-03-19 | 2019-03-11 | Antiglare film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111602073A true CN111602073A (en) | 2020-08-28 |
Family
ID=67986220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980008569.3A Pending CN111602073A (en) | 2018-03-19 | 2019-03-11 | Anti-dazzle film |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP7323986B2 (en) |
| KR (1) | KR20200132844A (en) |
| CN (1) | CN111602073A (en) |
| TW (1) | TW201938359A (en) |
| WO (1) | WO2019181615A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111580191A (en) | 2020-05-09 | 2020-08-25 | 惠州市华星光电技术有限公司 | Surface treatment method, anti-glare coating and display device |
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| JP5309111B2 (en) * | 2010-10-29 | 2013-10-09 | 富士フイルム株式会社 | Light diffusing film, polarizing plate, image display device, and method for producing light diffusing film |
| JP2013178533A (en) | 2013-04-05 | 2013-09-09 | Nitto Denko Corp | Hard-coated antiglare film, polarizing plate and image display device using the same, and method for manufacturing hard-coated antiglare film |
| JP2014112257A (en) * | 2014-03-05 | 2014-06-19 | Dainippon Printing Co Ltd | Optical sheet |
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2018
- 2018-03-19 JP JP2018050633A patent/JP7323986B2/en active Active
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- 2019-03-11 CN CN201980008569.3A patent/CN111602073A/en active Pending
- 2019-03-11 WO PCT/JP2019/009763 patent/WO2019181615A1/en active Application Filing
- 2019-03-11 KR KR1020207021511A patent/KR20200132844A/en not_active Application Discontinuation
- 2019-03-13 TW TW108108379A patent/TW201938359A/en unknown
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Also Published As
| Publication number | Publication date |
|---|---|
| TW201938359A (en) | 2019-10-01 |
| JP7323986B2 (en) | 2023-08-09 |
| JP2019164189A (en) | 2019-09-26 |
| KR20200132844A (en) | 2020-11-25 |
| WO2019181615A1 (en) | 2019-09-26 |
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