Anti-dazzle film
阅读说明:本技术 防眩膜 (Anti-dazzle film ) 是由 金京春 杉山靖典 渡部洋一 于 2019-03-11 设计创作,主要内容包括:本发明提供一种防眩性优异、且不易产生刺眼、并可应对高精细化的防眩膜。通过下述防眩膜可解决上述课题:一种防眩膜,其特征在于,其为在基材膜(10)的至少一个面具有防眩层(11)的防眩膜(1),防眩层(11)含有基础树脂(12)、与基础树脂(12)的折射率差为0.02以上且密度超过该基础树脂(12)的密度的0.90倍的粒子A、和密度为基础树脂(12)的密度的0.90倍以下的粒子B。作为粒子B,通过使用密度小的聚烯烃粒子等,能够防止粒子B的沉淀,容易解决上述课题。(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.)
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.
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.
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
The
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
Specific materials of the
The average thickness of the
As the
The
The "
The
The
The
The active ray-curable resin that the
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
The
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
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
The refractive index of the
The "refractive index of the
The density of the
The "density of the
The
The difference in refractive index between the particles a and the
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
The refractive index of the particles a and the
The density of the particles a is preferably 0.95 times or more, more preferably 1.0 times or more the density of the
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
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
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
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
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
Since the particles B are lighter than the
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
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
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
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
Further, it is preferably 15% by mass or less, and particularly preferably 10% by mass or less.
The
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
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
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
The method of applying the antiglare layer forming liquid to the
When the antiglare layer forming liquid contains an active ray-curable resin, the
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
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.
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