CN115151843A - Anti-dazzle film - Google Patents

Anti-dazzle film Download PDF

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Publication number
CN115151843A
CN115151843A CN202180016863.6A CN202180016863A CN115151843A CN 115151843 A CN115151843 A CN 115151843A CN 202180016863 A CN202180016863 A CN 202180016863A CN 115151843 A CN115151843 A CN 115151843A
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CN
China
Prior art keywords
antiglare
region
film
layer
particles
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CN202180016863.6A
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Chinese (zh)
Inventor
桥本尚树
望月政和
远藤宽也
安藤豪彦
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Nitto Denko Corp
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Nitto Denko Corp
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements

Abstract

The invention provides an anti-glare film which can be applied to an image display device having a camera function and does not inhibit the camera function. The antiglare film of the present invention comprises a transparent substrate and an antiglare layer disposed on at least one surface of the transparent substrate, wherein the antiglare layer comprises an antiglare region and a non-antiglare region. In one embodiment, the non-antiglare region is a through-hole of the antiglare layer. In one embodiment, in the non-antiglare region, a surface of the antiglare layer on the side opposite to the transparent substrate is a smooth surface.

Description

Anti-dazzle film
Technical Field
The present invention relates to an antiglare film.
Background
An image display device such as a mobile phone or a notebook Personal Computer (PC) may be mounted with internal electronic components such as a camera. Various studies have been made to improve the camera performance of such image display devices (for example, patent documents 1 to 7). For example, the shapes of image display devices typified by narrow-edge regions are being diversified, and it is required that camera performance can be sufficiently exhibited in accordance with the diversified shapes of the image display devices. The polarizing plate is constituted as follows: the polarization function is partially eliminated corresponding to the position where the camera lens is arranged, the camera function is made to function at this position, and the polarization plate functions at other positions. However, when the polarizing plate is applied to an antiglare image display device, that is, when the polarizing plate and an antiglare film are used in combination, a problem of blurring of a captured image occurs.
Documents of the prior art
Patent literature
Patent document 1: japanese patent laid-open publication No. 2011-81315
Patent document 2: japanese patent laid-open No. 2007-241314
Patent document 3: U.S. patent application publication No. 2004/0212555
Patent document 4: korean laid-open patent publication No. 10-2012-0118205
Patent document 5: korean patent No. 10-1293210 publication
Patent document 6: japanese patent laid-open No. 2012-137738
Patent document 7: U.S. patent application publication No. 2014/0118826
Disclosure of Invention
Technical problem to be solved by the invention
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an antiglare film which can be applied to an image display device having a camera function and does not hinder the camera function.
Means for solving the problems
The antiglare film of the present invention comprises a transparent substrate and an antiglare layer disposed on at least one surface of the transparent substrate, and the antiglare layer is composed of an antiglare region and a non-antiglare region.
In one embodiment, the non-antiglare region is a through-hole of the antiglare layer.
In one embodiment, in the non-antiglare region, a surface of the antiglare layer on the side opposite to the transparent substrate is a smooth surface.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, an antiglare film which can be applied to an image display device having a camera function and does not hinder the camera function can be provided.
Drawings
Fig. 1 is a schematic cross-sectional view of an antiglare film according to an embodiment of the present invention.
Fig. 2 is a schematic plan view of an antiglare film according to an embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view of an image display device according to another embodiment of the present invention.
Detailed Description
A. Outline of antiglare film
Fig. 1 is a schematic cross-sectional view of an antiglare film according to an embodiment of the present invention. Fig. 2 is a schematic plan view of an antiglare film according to an embodiment of the present invention. For the sake of easy observation, the length, thickness, and size of the irregularities of each layer in the drawings are different from the actual reduction ratio. The antiglare film 100 includes a transparent substrate 10 and an antiglare layer 20 disposed on at least one surface of the transparent substrate 10. The antiglare layer 20 is composed of an antiglare region 21 and a non-antiglare region 22. The antiglare region 21 is a region having antiglare properties and functioning as the antiglare layer 20. On the other hand, the non-antiglare region 22 is a region from which a function as the antiglare layer 20 is excluded in a part of the top-view region of the antiglare layer 20, that is, a region having no antiglare property (or having antiglare property lower than that of the antiglare region). In one embodiment, the antiglare region 21 is distinguished from the non-antiglare region 22 by a difference in haze value.
In one embodiment, as shown in fig. 1, the non-antiglare region 22 may be a through-hole of an antiglare layer.
Fig. 3 is a schematic cross-sectional view of an antiglare film according to another embodiment of the present invention. In the antiglare film 200, the surface of the antiglare layer 20 on the side opposite to the transparent substrate 10 is an uneven surface in the antiglare region 21, and the surface of the antiglare layer 20 on the side opposite to the transparent substrate 10 is a smooth surface in the non-antiglare region 22. In the present specification, the term "smooth surface" means a surface having an arithmetic average surface roughness Ra of 0.01 μm or less.
The antiglare film of the present invention can provide an antiglare film having antiglare properties and not interfering with a camera function, which can be applied to an image display device having a camera function by including an antiglare layer having a non-antiglare region. The non-antiglare region can be provided at a position corresponding to the position of a camera lens of an image display device to which the antiglare film is applied, and by providing such a non-antiglare region, clear image pickup can be achieved without hindering the camera function. On the other hand, in the antiglare region, a desired antiglare property can be exhibited, and therefore the antiglare film of the present invention can be preferably used for an antiglare image display device.
The antiglare film may further comprise any suitable other layer. For example, in an embodiment in which the non-antiglare region is a through-hole of the antiglare layer, the antiglare film may further include an outer cover layer and/or a low reflection treatment layer disposed on the side of the antiglare layer opposite to the transparent substrate in the antiglare region and on the side of the transparent substrate on the antiglare layer side in the non-antiglare region. In the embodiment in which the non-antiglare region is a smooth surface, the antiglare film may further include an outer coating layer and/or a low reflection treatment layer disposed on the side of the antiglare layer opposite to the transparent substrate.
The thickness of the antiglare film is preferably 20 to 200 μm, more preferably 40 to 150 μm, and still more preferably 60 to 100 μm.
The haze value of the antiglare film at the position of the antiglare region is preferably 5% to 80%, more preferably 15% to 60%.
The haze value of the antiglare film is preferably 5% or less, more preferably 3% or less, at the position of the non-antiglare region.
The difference between the haze value of the antiglare film at the position of the antiglare region and the haze value of the antiglare film at the position of the non-antiglare region is preferably a predetermined value or more. The difference in haze value between the antiglare film at the position of the antiglare region and the antiglare film at the position of the non-antiglare region is preferably 5% or more, more preferably 10% to 70%.
Regarding Δ ab based on the reflected hues (a, b) of the antiglare film, it is more preferable that the difference between Δ ab at the position of the antiglare region and Δ ab at the position of the non-antiglare region is smaller. If the difference in Δ ab is small, an antiglare film having an excellent sense of unity in appearance can be obtained. The difference Δ ab is preferably 20 or less, and more preferably 10 or less. The reflected color phase can be measured, for example, using a spectrocolorimeter CM-2600D (light source: D65) manufactured by Konika Mentada. Δ ab can be measured by the reflected color (a, b), using (a) 2 +b 2 ) 1/2 The formula (2) is obtained.
B. Anti-glare layer
As described above, the antiglare layer is composed of an antiglare region and a non-antiglare region. Typically, in the antiglare region, one surface of the antiglare layer is an uneven surface.
The number, arrangement, shape, size, and the like of the non-antiglare regions may be any appropriate ones. For example, the design is made in accordance with the position, shape, size, and the like of a camera unit of the mounted image display device. In this case, the non-antiglare region is preferably substantially circular with a diameter of 10mm or less.
The arithmetic average surface roughness Ra of the uneven surface in the antiglare region is preferably 0.01 to 1 μm, more preferably 0.05 to 0.5 μm. In such a range, an antiglare film having sufficient antiglare properties and being less likely to obstruct the visibility of an image display device can be obtained.
In the embodiment (embodiment shown in fig. 3) in which the non-antiglare region is a smooth surface, the arithmetic average surface roughness Ra of the uneven surface in the non-antiglare region is preferably 0.01 μm or less, more preferably 0.005 μm or less.
In the embodiment (the embodiment shown in fig. 3) in which the non-antiglare region is a smooth surface, the difference between the arithmetic average surface roughness Ra of the uneven surface in the antiglare region and the arithmetic average surface roughness Ra of the uneven surface in the non-antiglare region (arithmetic average surface roughness Ra of the antiglare region — arithmetic average surface roughness Ra of the non-antiglare region) is preferably a predetermined value or more. The difference in the arithmetic average surface roughness Ra is preferably 0.05 μm or more, more preferably 0.1 μm or more.
The maximum height Ry of the uneven surface in the antiglare region is preferably 0.5 to 5 μm, more preferably 1 to 3 μm. In such a range, an antiglare film having sufficient antiglare properties and being less likely to obstruct the visibility of an image display device can be obtained.
In the embodiment (embodiment shown in fig. 3) in which the non-antiglare region is a smooth surface, the maximum height Ry of the uneven surface in the non-antiglare region is preferably 0.5 μm or less, and more preferably 0.3 μm or less.
In the case of the embodiment (embodiment shown in fig. 3) in which the non-antiglare region is a smooth surface, the difference between the maximum height Ry of the uneven surface in the antiglare region and the maximum height Ry of the uneven surface in the non-antiglare region (the maximum height Ry of the antiglare region — the maximum height Ry of the non-antiglare region) is preferably equal to or greater than a predetermined value. The difference in the maximum height Ry is preferably 0.1 μm or more, and more preferably 4.5 μm or more.
The average inclination angle θ a of the uneven surface in the antiglare region is preferably 0.3 ° to 5 °, more preferably 0.5 ° to 4 °. In such a range, an antiglare film having sufficient antiglare properties and being less likely to obstruct the visibility of an image display device can be obtained.
In the embodiment (embodiment shown in fig. 3) in which the non-antiglare region is a smooth surface, the average inclination angle θ a of the uneven surface in the non-antiglare region is preferably 0.3 ° or less, more preferably 0.1 ° or less.
In the case of the embodiment (the embodiment shown in fig. 3) in which the non-antiglare region is a smooth surface, the difference between the average inclination angle θ a of the uneven surface in the antiglare region and the average inclination angle θ a of the uneven surface in the non-antiglare region (the average inclination angle θ a of the antiglare region — the average inclination angle θ a of the non-antiglare region) is preferably equal to or greater than a predetermined value. The difference in the average inclination angle θ a is preferably 0.5 ° or more, and more preferably 1 ° or more.
The arithmetic surface roughness Ra, the maximum height Ry, and the average inclination angle θ a of the concave-convex surface are defined according to JIS B0601 (1994 version). These characteristic values can be measured by a stylus-type surface roughness measuring instrument (for example, manufactured by osaka research, high-precision fine shape measuring instrument, trade name "Surfcorder ET 4000"). Further, the average inclination angle θ a is represented by θ a = tan -1 The formula for Δ a defines the value. Δ a is a value obtained by dividing the sum of differences (height h) between the peaks of adjacent projections and the lowest points of recesses on the roughness curve defined in JIS B0601 (1994 version) (h 1+ h2+ h3+ · · · hn) by the reference length L of the roughness curve, and is expressed by the formula Δ a = (h 1+ h2+ h3+ · · · hn)/L.
The thickness of the antiglare layer in the antiglare region is preferably 1 μm to 20 μm, more preferably 3 μm to 15 μm, and still more preferably 5 μm to 10 μm. In such a range, an antiglare film having sufficient antiglare properties and being less likely to obstruct the visibility of an image display device can be obtained.
The smaller the difference between the thickness of the antiglare layer in the antiglare region and the thickness of the antiglare layer in the non-antiglare region is, the more preferable. If the difference in thickness is small, an antiglare film having an excellent sense of unity in appearance can be obtained. The difference between the thickness of the antiglare layer in the antiglare region and the thickness of the antiglare layer in the non-antiglare region is preferably 5 μm or less, more preferably 3 μm or less, and even more preferably 1 μm or less.
The antiglare layer can be formed using any appropriate material as long as the effect of the present invention can be obtained. The antiglare layer preferably comprises any suitable resin. In one embodiment, the antiglare layer includes a binder resin and particles. The antiglare layer is formed, for example, by coating a composition for forming an antiglare layer on a transparent substrate and then curing the composition. The composition for forming an antiglare layer may contain a curable compound, the particles, and the like.
In one embodiment, the binder resin is a resin derived from a curable compound, and examples of the resin include a thermosetting resin, an active energy ray-curable resin, and the like.
In the composition for forming an antiglare layer, the curable compound as a main component preferably contains a polyfunctional monomer, an oligomer derived from the polyfunctional monomer, and/or a prepolymer derived from the polyfunctional monomer. Examples of the polyfunctional monomer include tricyclodecane dimethanol diacrylate, pentaerythritol di (meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylolpropane triacrylate, pentaerythritol tetra (meth) acrylate, dimethylolpropane tetraacrylate, dipentaerythritol hexa (meth) acrylate, 1, 6-hexanediol (meth) acrylate, 1, 9-nonanediol diacrylate, 1, 10-decanediol (meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, dipropylene glycol diacrylate, isocyanurate tri (meth) acrylate, ethoxylated glycerol triacrylate, and ethoxylated pentaerythritol tetraacrylate. The polyfunctional monomer may be used alone or in combination of two or more.
The above-mentioned polyfunctional monomer may also have a hydroxyl group. When the composition for forming an antiglare layer containing a polyfunctional monomer having a hydroxyl group is used, the adhesion between the transparent base material and the antiglare layer can be improved. Examples of the polyfunctional monomer having a hydroxyl group include pentaerythritol tri (meth) acrylate and dipentaerythritol pentaacrylate.
The content of the polyfunctional monomer, the oligomer derived from the polyfunctional monomer, and the prepolymer derived from the polyfunctional monomer is preferably 30 to 100 wt%, more preferably 40 to 95 wt%, and particularly preferably 50 to 95 wt%, based on the total amount of the monomer, oligomer, and prepolymer in the antiglare layer-forming composition.
The composition for forming an antiglare layer may further contain a monofunctional monomer. Examples of the monofunctional monomer include ethoxylated o-phenylphenol (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, phenoxypolyethylene glycol (meth) acrylate, 2-ethylhexyl acrylate, lauryl acrylate, isooctyl acrylate, isostearyl acrylate, cyclohexyl acrylate, isobornyl acrylate, benzyl acrylate, 2-hydroxy-3-phenoxy acrylate, acryloylmorpholine, 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and hydroxyethylacrylamide.
The above monofunctional monomer may also have a hydroxyl group. Examples of the monofunctional monomer having a hydroxyl group include hydroxyalkyl (meth) acrylates such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenoxy acrylate, and 1, 4-cyclohexanemethanol monoacrylate; n- (2-hydroxyalkyl) (meth) acrylamides such as N- (2-hydroxyethyl) (meth) acrylamide and N-hydroxymethyl (meth) acrylamide. Among them, 4-hydroxybutyl acrylate and N- (2-hydroxyethyl) acrylamide are preferable.
The composition for forming an antiglare layer may contain urethane (meth) acrylate and/or an oligomer of urethane (meth) acrylate. The urethane (meth) acrylate can be obtained, for example, by reacting a hydroxyl (meth) acrylate obtained from a (meth) acrylic acid or a (meth) acrylate and a polyol with a diisocyanate. The urethane (meth) acrylate and the urethane (meth) acrylate oligomer may be used alone or in combination of two or more.
Examples of the (meth) acrylic acid ester include methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, cyclohexyl (meth) acrylate, and the like.
Examples of the polyhydric alcohol include ethylene glycol, 1, 3-propanediol, 1, 2-propanediol, diethylene glycol, dipropylene glycol, neopentyl glycol, 1, 3-butanediol, 1, 4-butanediol, 1, 6-hexanediol, 1, 9-nonanediol, 1, 10-decanediol, 2, 4-trimethyl-1, 3-pentanediol, 3-methyl-1, 5-pentanediol, neopentyl glycol hydroxypivalate, tricyclodecanedimethanol, 1, 4-cyclohexanediol, spiroglycol, tricyclodecanedimethanol, hydrogenated bisphenol A, ethylene oxide-added bisphenol A, propylene oxide-added bisphenol A, trimethylolethane, trimethylolpropane, glycerol, 3-methylpentane-1, 3, 5-triol, pentaerythritol, dipentaerythritol, tripentaerythritol, and glucose.
As the diisocyanate, various aromatic, aliphatic or alicyclic diisocyanates can be used, for example. Specific examples of the diisocyanate include tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 2, 4-toluene diisocyanate, 4-diphenyl diisocyanate, 1, 5-naphthalene diisocyanate, 3-dimethyl-4, 4-diphenyl diisocyanate, xylene diisocyanate, trimethylhexamethylene diisocyanate, 4-diphenylmethane diisocyanate, and hydrogenated products thereof.
In one embodiment, the antiglare layer comprises particles, as described above. By including the particles, the surface of the antiglare layer can be made uneven. In addition, the haze value of the antiglare layer can be controlled. Examples of the particles include inorganic particles and organic particles. Specific examples of the inorganic particles include silica particles, titanium oxide particles, alumina particles, zinc oxide particles, tin oxide particles, calcium carbonate particles, barium sulfate particles, talc particles, kaolin particles, and calcium sulfate particles. Specific examples of the organic particles include polymethyl methacrylate resin particles (PMMA particles), silicone resin particles, polystyrene resin particles, polycarbonate resin particles, acrylic styrene resin particles, benzoguanamine resin particles, melamine resin particles, polyolefin resin particles, polyester resin particles, polyamide resin particles, polyimide resin particles, polyvinyl fluoride resin particles, and the like. The particles may be used alone or in combination of two or more.
The weight average particle diameter of the particles is preferably 1 to 10 μm, more preferably 2 to 7 μm. The weight average particle diameter of the particles can be measured by the coulter counter method. In the antiglare layer or the antiglare layer-forming composition, the particles may be present in the form of primary particles and/or in the form in which the primary particles are aggregated, and in the present specification, the "weight-average particle diameter of the particles" refers to a weight-average particle diameter obtained by measuring the particles in the antiglare layer-forming composition by the coulter counter method, regardless of the particle form.
The refractive index of the particles is preferably 1.1 to 1.9, more preferably 1.2 to 1.7. Examples of the particles having such a refractive index include silicone particles, polystyrene particles, polymethyl methacrylate, and a copolymer of styrene and methacrylic acid. The difference (n 1-n 2) between the refractive index n1 of the particles and the refractive index n2 of the binder resin is preferably-0.01 or less, more preferably-0.03 or less, and still more preferably-0.05 or less. Within such a range, an antiglare film having excellent transparency can be obtained.
The shape of the particles is not particularly limited, and may be, for example, a substantially spherical shape such as a bead shape, or an indefinite shape such as a powder. The particles are preferably substantially spherical particles having an aspect ratio of 1.5 or less, and more preferably spherical particles.
In the antiglare layer, the content of the particles is preferably 0.2 to 12 parts by weight, more preferably 0.5 to 12 parts by weight, still more preferably 1 to 9 parts by weight, and particularly preferably 1 to 7 parts by weight, based on 100 parts by weight of the binder resin. Within such a range, an antiglare film having more excellent antiglare properties can be obtained.
In the composition for forming an antiglare layer, the particles are preferably present with good dispersibility. The dispersibility (degree of dispersion) of the particles can be evaluated by particle size distribution measurement by a laser diffraction scattering particle size distribution measurement method, a dynamic light scattering method, a static light scattering method, or the like. The measurement can be performed by observation with a microscope such as a scanning electron microscope.
An antiglare layer having a particle size distribution obtained by particle size distribution measurement using laser diffraction scatteringWhen the dispersibility of the particles in the composition for formation was evaluated, D 50 (particle diameter at 50% volume accumulation) and volume accumulated particle diameter D 90 The absolute value of the difference (particle diameter at 90% by volume) is preferably 5 μm or less, more preferably less than 3 μm, still more preferably less than 1 μm, and particularly preferably 0 μm or more and less than 1 μm. Within such a range, an antiglare layer having an appropriate surface shape can be formed.
When the dispersibility of the particles in the antiglare layer-forming composition is evaluated by the particle size distribution obtained by the laser diffraction scattering particle size distribution measurement method, the content of the particles having a particle size of 1 μm or more and less than 5 μm is preferably more than 50% by weight, more preferably 70% by weight or more, and further preferably 80% by weight to 100% by weight, based on the total amount of the particles in the composition. Within such a range, an antiglare layer having an appropriate surface shape can be formed.
The composition for forming an antiglare layer preferably contains any suitable photopolymerization initiator. Examples of the photopolymerization initiator include 2, 2-dimethoxy-2-phenylacetophenone, acetophenone, benzophenone, xanthone, 3-methylacetophenone, 4-chlorobenzophenone, 4 '-dimethoxybenzophenone, benzoin propyl ether, benzil dimethyl ketal, N, N, N', N '-tetramethyl-4, 4' -diaminobenzophenone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, and thioxanthone compounds.
The composition for forming an antiglare layer may contain or may not contain a solvent. Examples of the solvent include alcohols such as methanol, ethanol, isopropanol, butanol, and 2-methoxyethanol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclopentanone; esters such as methyl acetate, ethyl acetate, and butyl acetate; ethers such as diisopropyl ether and propylene glycol monomethyl ether; glycols such as ethylene glycol and propylene glycol; cellosolves such as ethyl cellosolve and butyl cellosolve; aliphatic hydrocarbons such as hexane, heptane and octane; aromatic hydrocarbons such as benzene, toluene, and xylene. These may be used alone or in combination of two or more. When the composition for forming an antiglare layer, which contains the organoclay, is used, toluene, cyclopentanone, and/or xylene are preferably used as a solvent.
The solid content concentration of the composition for forming an antiglare layer is preferably 20% by weight to 80% by weight, more preferably 25% by weight to 60% by weight, and still more preferably 30% by weight to 50% by weight. Within such a range, an antiglare layer having an appropriate surface shape can be obtained.
The composition for forming an antiglare layer may further contain any appropriate additive. Examples of the additives include leveling agents, antiblocking agents, dispersion stabilizers, thixotropic agents, antioxidants, ultraviolet absorbers, defoaming agents, thickening agents, dispersing agents, surfactants, catalysts, lubricants, antistatic agents, and the like.
The antiglare layer can be obtained by applying the composition for an antiglare layer to a transparent substrate and then curing the composition. As a method for applying the composition for forming an antiglare layer, any appropriate method can be employed. Examples thereof include a bar coating method, a roll coating method, a gravure coating method, a bar coating method, a slot coating method, a curtain coating method, a spray coating method, and a notch wheel coating method.
The non-antiglare region of the antiglare layer in the antiglare film (the antiglare film shown in fig. 1) in which the non-antiglare region is a through hole of the antiglare layer may be formed by any appropriate method. For example, the following methods may be mentioned: the surface energy of the transparent substrate is partially adjusted to reduce the wettability of the transparent substrate with respect to the antiglare layer-forming composition at the position where the non-antiglare region is formed, so that the antiglare layer is not formed at the position. Examples of the method for adjusting the surface energy include an inkjet treatment; removing static electricity; corona, plasma, etc. Further, a non-antiglare region (through hole) may be formed by a method such as excavation of a predetermined position after the formation of the antiglare layer.
The non-antiglare region of the antiglare layer in the antiglare film (the antiglare film shown in fig. 3) in which the non-antiglare region is a smooth surface can be formed by any suitable method. For example, after a layer having an uneven surface is formed, a part of the uneven surface is filled, whereby a non-antiglare region can be formed. As the material for filling the uneven surface, any appropriate material can be used. Examples of such a material include a binder resin used in the antiglare layer forming composition. Further, a non-antiglare region (smooth surface) can also be formed by a method such as excavation of a predetermined position after the formation of the antiglare layer.
As a method for curing the composition for forming an antiglare layer, any appropriate curing treatment can be used. The curing treatment is typically performed by ultraviolet irradiation. The cumulative amount of ultraviolet light irradiation is preferably 50mJ/cm 2 ～500mJ/cm 2 。
C. Transparent substrate
As the transparent substrate, any appropriate substrate can be used as long as it has visible light transmittance. Examples of the material constituting the transparent substrate include triacetyl cellulose (TAC), polycarbonate, acrylic polymer, cyclic polyolefin, polyolefin having a norbornene structure, polyethylene terephthalate, and the like.
The thickness of the transparent substrate is preferably 10 to 500. Mu.m, more preferably 20 to 300. Mu.m, and still more preferably 30 to 100. Mu.m. The refractive index of the transparent substrate is preferably 1.30 to 1.80.
In the antiglare film (the antiglare film shown in fig. 1) in which the non-antiglare region is a through-hole of the antiglare layer, the arithmetic average surface roughness Ra of the transparent base material at a position corresponding to the non-antiglare region is preferably 0.01 μm or less, and more preferably 0.005 μm or less.
In an antiglare film (an antiglare film shown in fig. 1) in which the non-antiglare region is a through-hole of the antiglare layer, the difference between the arithmetic average surface roughness Ra of the uneven surface of the antiglare layer in the antiglare region and the arithmetic average surface roughness Ra of the transparent base material at a position corresponding to the non-antiglare region (arithmetic average surface roughness Ra of the antiglare region — arithmetic average surface roughness Ra of the transparent base material) is preferably a predetermined value or more. The difference in the arithmetic average surface roughness Ra is preferably 0.05 μm or more, more preferably 0.1 μm or more.
In an antiglare film (the antiglare film shown in fig. 1) in which the non-antiglare region is a through-hole of the antiglare layer, the maximum height Ry of the transparent substrate at a position corresponding to the non-antiglare region is preferably 0.5 μm or less, and more preferably 0.3 μm or less.
In an antiglare film (antiglare film shown in fig. 1) in which the non-antiglare region is a through-hole of the antiglare layer, the difference between the maximum height Ry of the uneven surface of the antiglare layer in the antiglare region and the maximum height Ry of the transparent substrate at a position corresponding to the non-antiglare region (maximum height Ry of the antiglare region — maximum height Ry of the transparent substrate) is preferably a predetermined value or more. The difference in the maximum height Ry is preferably 0.1 μm or more, and more preferably 4.5 μm or more.
In an antiglare film (the antiglare film shown in fig. 1) in which the non-antiglare region is a through-hole of the antiglare layer, the average inclination angle θ a of the transparent substrate at a position corresponding to the non-antiglare region is preferably 0.3 ° or less, and more preferably 0.1 ° or less.
In an antiglare film in which the non-antiglare region is a through-hole of the antiglare layer (the antiglare film shown in fig. 1), the difference between the average inclination angle θ a of the uneven surface of the antiglare layer in the antiglare region and the average inclination angle θ a of the transparent substrate at a position corresponding to the non-antiglare region (average inclination angle θ a of the antiglare region — average inclination angle θ a of the transparent substrate) is preferably a predetermined value or more. The difference in the average inclination angle θ a is preferably 0.5 ° or more, and more preferably 1 ° or more.
D. Overcoat, low reflection treatment layer
The outer cover can be of any suitable construction. For example, the outer coating layer can be formed by applying the same composition as the material for forming an antiglare layer described in item B, except that the composition does not contain a scattering component for exhibiting antiglare properties. Examples of the coating method include a bar coating method, a roll coating method, a gravure coating method, a bar coating method, a slot coating method, a curtain coating method, a jet coating method, and a notch wheel coating method.
The low reflection processed layer is usually subjected to a dry film forming process of an optical adjustment layer represented by a wet coating process, a sputtering process, a vapor deposition process, or the like of a low refractive index material, and in the present invention, various methods represented by these processes can be freely selected.
Examples
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.
[ example 1]
(preparation of coating liquid for Forming antiglare layer)
As the resin contained in the antiglare layer forming material, 50 parts by weight of an ultraviolet-curable urethane acrylate resin (product name "UV1700TL" manufactured by mitsubishi chemical corporation, 80% in solid content) and 50 parts by weight of a multifunctional acrylate ester having pentaerythritol triacrylate as a main component (product name "Viscoat #300" manufactured by osaka organic chemical corporation, 100% in solid content) were prepared. A mixture of these resins (solid resin: 100 parts by weight), 10 parts by weight of acrylic and styrene copolymer particles (available under the trade name "Techpolymer SSX1055QXE", manufactured by chemical conversion products INDUSTRIES, ltd.) as the particles, 2.5 parts by weight of synthetic montmorillonite (available under the trade name "Sumecton SAN", manufactured by KUNMINE INDUSTRIES Ltd.) as a thixotropy imparting agent, 3 parts by weight of a photopolymerization initiator (available under the trade name "OMNIRAD907", manufactured by BASF) and 0.15 part by weight of a leveling agent (available under the trade name "LE-303", manufactured by Kyoeisha chemical Co., ltd., 40% solid content) were mixed. The mixture was diluted with a toluene/cyclopentanone mixed solvent (weight ratio: 80/20) so that the solid content concentration reached 40%, to prepare an antiglare layer-forming coating liquid.
(preparation of coating liquid for hard coat layer formation)
As the resin contained in the hard coat layer, 100 parts by weight of an ultraviolet-curable acrylate resin (product name "Viscoat #300" manufactured by osaka organic chemical industries, ltd., 100% solid content) was prepared. This resin (solid resin: 100 parts by weight), 3 parts by weight of a photopolymerization initiator (trade name "OMNIRAD907" manufactured by BASF corporation), and 0.15 part by weight of a leveling agent (trade name "LE-303" manufactured by Kyoeisha chemical Co., ltd., solid content: 40%) were mixed. The mixture was diluted with a MIBK/cyclopentanone mixed solvent (70/30 by weight) to prepare a coating liquid for forming a hard coat layer so that the solid content concentration reached 30%.
(production of antiglare film a)
As the transparent substrate, a transparent plastic Film substrate (trade name "TD80UL", manufactured by TAC, fuji Film gmbh) was prepared. The antiglare layer forming material (coating liquid) was applied to one surface of the transparent plastic film substrate by a bar coater to form a coating film. Then, the transparent plastic film substrate on which the coating film is formed is conveyed to a drying step. In the drying step, the coating film is dried by heating at 80 ℃ for 1 minute. Then, the cumulative quantity of light irradiated by the high pressure mercury lamp was 300mJ/cm 2 The coating film was cured to form an antiglare layer having a thickness of 4.0 μm, and an antiglare film a having a haze of 25% was obtained.
( Formation of non-glare regions: embedding treatment with hard coat layer on antiglare film a )
A surface protective film having a circular void portion with a diameter of 5mm was attached to the obtained antiglare film, and a laminate in which a part of the surface of the antiglare layer was exposed through the void was produced. The coating liquid for forming a hard coat layer is applied to the protective film side of the laminated film by a bar coater to form a coating film. Then, the transparent plastic film substrate on which the coating film is formed is conveyed to a drying step. In the drying step, the coating film is dried by heating at 80 ℃ for 1 minute. Then, the cumulative quantity of light irradiated by the high-pressure mercury lamp was 300mJ/cm 2 The coating film was cured by ultraviolet rays to form a film having a hard coat layer of 4.0 μm thickness only on the exposed portion.
After irradiation with ultraviolet rays, the surface protective film is peeled off, thereby obtaining an antiglare film a in which a non-antiglare region (hard coat layer) is formed on a part of the surface of the antiglare hard coat layer and an antiglare region is formed on the other part.
[ example 2]
(preparation of coating liquid for Forming antifouling layer)
As the resin contained in the antifouling hard coat layer forming material, 100 parts by weight of an ultraviolet-curable acrylate resin (product name "Viscoat #300" manufactured by osaka organic chemical industries, ltd., solid content 100%) was prepared. This resin (solid resin: 100 parts by weight), 3 parts by weight of a photopolymerization initiator (trade name "OMNIRAD907" manufactured by BASF corporation) and 0.20 part by weight of a leveling agent (trade name "OPTOOL DAC" manufactured by Daikin Industries, ltd., solid content: 20%) were mixed. The mixture was diluted with a MIBK/cyclopentanone mixed solvent (70/30 by weight) so that the solid content concentration reached 30%, to prepare a coating liquid for an antifouling hard coat layer.
(partial coating of coating liquid for antifouling hard coat layer)
A surface protective Film having a circular void portion with a diameter of 5mm was attached to a transparent plastic Film substrate (TAC, manufactured by Fuji Film gmbh, trade name "TD80 UL") to prepare a laminate in which a part of the surface of the transparent plastic Film substrate was exposed through the void. The antifouling hard coat layer coating liquid was applied to the protective film side of the stacked films using a bar coater. Then, the transparent plastic film substrate on which the coating film is formed is conveyed to a drying step. In the drying step, the coating film is dried by heating at 80 ℃ for 1 minute. Then, the cumulative quantity of light irradiated by the high-pressure mercury lamp was 300mJ/cm 2 The coating film was cured to prepare a film having an antifouling hard coat layer of 3.0 μm thickness formed only on the exposed portion.
After the irradiation with ultraviolet rays, the surface protective film was peeled off to obtain a base material film in which an antifouling hard coat layer was laminated on a part of the surface of the transparent plastic base material layer.
(production of antiglare film having partially transparent portion)
The coating liquid for forming an antiglare hardcoat layer prepared in example 1 was applied to the base material film having an antifouling hardcoat layer on a part of the surface in the same procedure as in example 1 to form an antiglare layer having a thickness of 4.0 μm, and an antiglare film B having a haze of 25% was obtained. On the antifouling hard coat layer provided in advance, the coating liquid before drying is repelled without being coated, and this portion becomes a non-antiglare region. In addition, the other portions become antiglare regions.
[ example 3]
An antiglare film a was obtained in the same manner as in example 1, except that "embedding treatment with a hard coat layer on the antiglare film" was not performed.
Irradiating a circular area having a diameter of 5mm on the antiglare film a with CO 2 The laser light is used to remove the antiglare property until the antiglare property disappears, and a non-antiglare region is provided, and an antiglare film C including the non-antiglare region and an antiglare region is obtained.
Comparative example 1
An antiglare film a was obtained in the same manner as in example 1, except that "embedding treatment with a hard coat layer on the antiglare film" was not performed.
Comparative example 2
As the transparent substrate, a transparent plastic Film substrate (trade name "TD80UL", manufactured by TAC, fuji Film gmbh) was prepared. The antifouling hard coat layer-forming coating liquid prepared in the same manner as in example 2 was applied to one surface of the transparent plastic film substrate using a bar coater. Then, the transparent plastic film substrate on which the coating film is formed is conveyed to a drying step. In the drying step, the coating film is dried by heating at 80 ℃ for 1 minute. Then, the cumulative quantity of light irradiated by the high-pressure mercury lamp was 300mJ/cm 2 The coating film was cured to form a hard-coat antifouling layer having a thickness of 4.0 μm, thereby obtaining a hard-coat film.
The antiglare films obtained in examples and comparative examples and the hard coat film obtained in comparative example 2 were subjected to the following evaluations. The results are shown in Table 1.
(1) Evaluation of sharpness of image captured by camera
A digital camera (product name "cool fix W100" manufactured by NIKON corporation) was prepared, the film was attached with an adhesive in a state where the photographing mode was started, and the blurring of the image displayed on the digital camera display unit was evaluated by the following criteria. In addition, the antiglare film of the embodiment is attached in such a manner that the non-antiglare region corresponds to the camera lens portion.
Little blur A (good)
The grade B (acceptable) at which the subject can be discriminated although the image is blurred
The image is blurred so that the photographed object C (failure) cannot be discriminated
(2) Evaluation of antiglare Property
The film was attached to a black acrylic plate using an adhesive, and the surface of the film was irradiated with a fluorescent lamp of an LED light source, and the state of blur of the reflected fluorescent lamp was evaluated by the following criteria. In addition, the antiglare film of the example was subjected to this evaluation for the antiglare region of the antiglare layer.
Rating A (good) of fluorescent lamp with completely fuzzy contour
Fluorescent lamp, although fuzzy, retains class B (acceptable) of the outline
Grade C (unqualified) for clear understanding of the outline of the fluorescent lamp
(3) Haze value
The film was attached to a digital camera as described in (1) above, and the HAZE value of the portion corresponding to the camera lens portion and the HAZE value of the portion corresponding to the portion other than the camera lens portion were measured using a HAZE METER (trade name "HAZE METER HM-150", manufactured by mura color technology research). In the antiglare film of the embodiment, the camera lens portion corresponds to the antiglare region, and the portion other than the camera lens portion corresponds to the non-antiglare region.
[ Table 1]
Figure BDA0003815199900000151
Description of the symbols
10. Transparent substrate
20. Anti-glare layer
100. Anti-dazzle film

Claims (3)

1. An anti-glare film which is characterized in that,
which comprises a transparent base material and an antiglare layer disposed on at least one surface of the transparent base material,
the antiglare layer is composed of an antiglare region and a non-antiglare region.
2. The antiglare film according to claim 1, wherein the non-antiglare region is a through-hole of the antiglare layer.
3. The antiglare film according to claim 1, wherein, in the non-antiglare region, a surface of the antiglare layer on the opposite side from the transparent substrate is a smooth surface.
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