CN108663732B - Low-haze anti-dazzle film and polarizing plate - Google Patents
Low-haze anti-dazzle film and polarizing plate Download PDFInfo
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- CN108663732B CN108663732B CN201810444940.8A CN201810444940A CN108663732B CN 108663732 B CN108663732 B CN 108663732B CN 201810444940 A CN201810444940 A CN 201810444940A CN 108663732 B CN108663732 B CN 108663732B
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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
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0226—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures having particles on the surface
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
Abstract
The invention discloses a low-haze anti-dazzle film and a polarizing plate. The anti-glare layer comprises a plurality of organic microparticles, a plurality of silica nanoparticles and a binder resin, wherein the silica nanoparticles are dispersed among the organic microparticles in the form of an aggregate. Wherein the average spacing (Sm) of the unevenness on the surface of the antiglare layer is between 10 and 50 micrometers (mum), the arithmetic average roughness (Ra) is between 0.02 and 0.08 micrometers (mum), and the maximum height roughness (Ry) is between 0.12 and 0.40 micrometers (mum).
Description
Technical Field
The invention relates to an anti-dazzle film, in particular to a low-haze anti-dazzle film which is high in definition and fine in surface and can be used for image display equipment.
Background
The image display products are developed towards optical requirements of high contrast, wide viewing angle, high brightness, high fineness and the like, but since the general image display has an external light source in the use environment, the phenomena of glare and the like due to a reflection effect are generated, and the viewing effect of visual sense is reduced. The outer surface of the display may require some surface treatment to reduce the effect of reflected light on the human eye viewing the display.
In general, an anti-glare film is added to an image display to control the degree of light scattering by using the internal diffusion or external diffusion of light caused by the anti-glare film to suppress glare. The internal diffusion uses a plurality of materials with different refractive indexes in the anti-dazzle film to control the degree of light scattering according to the conditions of refractive index difference, content proportion and size type; the degree of light scattering is controlled by the shape, size, and the like of the surface of the optical film by the out-diffusion. Therefore, the anti-glare film is generally formed with a structure formed of materials having different refractive indexes inside the optical film to cause internal diffusion of light penetrating into the optical film and/or a structure formed with a rough surface structure on a surface layer to cause external diffusion of light, so as to achieve the anti-glare effect.
In the prior art, various anti-glare films have been proposed, for example, a transparent film material is coated with a curable resin containing fine particles and cured to cause the fine particles to generate agglomeration phenomenon and protrude out of the film surface, but the particles are easy to settle in the coating process, the particles are difficult to protrude out of the surface, and the film surface is bright and has insufficient anti-glare effect. In another embodiment, an antiglare film has a phase separation structure in which two to three kinds of resins are compatible with each other to form a co-continuous phase on the surface of a cured film, and the antiglare film has very excellent antiglare properties, but has disadvantages of excessively high haze and poor adhesion of the surface resin due to poor resin compatibility. In addition, it has been proposed to form a concave-convex surface on the surface of the transparent film material by means of stamping, but the anti-glare film made by this method has poor scratch resistance and is difficult to meet the requirements of image displays.
The present invention provides a novel antiglare film having characteristics of low haze, high definition, and fine surface.
Disclosure of Invention
The purpose of the present invention is to provide an antiglare film having low haze, high definition, and a fine surface.
In order to achieve the above objects, the present invention provides a novel low haze antiglare film comprising a light-transmitting substrate and an antiglare layer provided on a surface of the light-transmitting substrate, wherein the antiglare layer comprises a plurality of organic fine particles, a plurality of silica nano particles and a binder resin, the plurality of silica nano particles being dispersed in the form of aggregates among the plurality of organic fine particles, and wherein a mean spacing (Sm) of a concavo-convex structure of the surface of the antiglare layer is between 10 micrometers (μm) and 50 micrometers (μm), an arithmetic mean roughness (Ra) is between 0.02 micrometers (μm) and 0.08 micrometers (μm), and a maximum height roughness (Ry) is between 0.12 micrometers (μm) and 0.40 micrometers (μm).
The anti-glare film of the present invention has a light transmittance of more than 90% and a total haze of less than 5%, preferably less than 4%.
In one embodiment, the thickness of the anti-glare layer of the anti-glare film on the transparent substrate is between 2 micrometers (μm) and 10 micrometers (μm).
In one embodiment, the particle size of the silica nanoparticles used in the anti-glare layer of the anti-glare film is between 10 nanometers (nm) and 100 nanometers (nm), the secondary particle size (d50) is between 50 nanometers (nm) and 120 nanometers (nm), and the preferred secondary particle size (d50) is between 70 nanometers (nm) and 110 nanometers (nm).
In one embodiment, the organic particles used in the antiglare film may be particles made of at least one material selected from the group consisting of acrylic resins, polystyrene resins, styrene-acrylic copolymers, polyethylene resins, epoxy resins, silicone resins, polyvinylidene fluoride resins, and polyvinyl fluoride resins, and may be organic particles subjected to surface hydrophilic treatment. The organic fine particles suitable for the antiglare film of the present invention have a particle size of 5 micrometers (μm) or less, preferably 0.5 to 4 micrometers (μm), more preferably 1 to 3 micrometers (μm).
In one embodiment, the binder resin used in the antiglare film is an acrylate resin.
In one embodiment, the anti-glare layer comprises 3 to 12 weight percent of the silica nanoparticles.
In one embodiment, the anti-glare layer contains 3 to 12 weight percent of the organic particles.
In one embodiment, the refractive index of the organic particles in the anti-glare layer is between 1.40 and 1.65.
In addition, the antiglare film of the present invention can be combined with other functional optical films to form a composite optical film. A functional optical film such as a polarizing film may be used, wherein the polarizing film may be located on the other surface of the transparent substrate of the antiglare film with respect to the antiglare layer.
The low haze antiglare film of the present invention has high light transmittance, low haze, and good hardness, has a fine surface, and can provide good antiglare properties.
The above summary is intended to provide a simplified summary of the disclosure in order to provide a basic understanding to the reader. This summary is not an extensive overview of the disclosure and is intended to neither identify key/critical elements of the embodiments nor delineate the scope of the embodiments. The basic spirit of the present invention and the technical means and embodiments adopted by the present invention will be easily understood by those skilled in the art after referring to the following embodiments.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1 is a Scanning Electron Microscope (SEM)18,000-magnification image of the surface of the antiglare film made in example 1 of the present invention.
Fig. 2 is a Scanning Electron Microscope (SEM)8,000-magnification image of a cross section of the antiglare film of example 1 of the present invention.
Detailed Description
In order to make the disclosure more complete and complete, the following description sets forth illustrative aspects and embodiments of the invention; it is not intended to be the only form in which the embodiments of the invention may be practiced or utilized. The embodiments disclosed below may be combined with or substituted for one another where appropriate, and additional embodiments may be added to one embodiment without further recitation or description.
The invention aims to provide an anti-dazzle film with low haze, high definition and fine surface.
The invention provides an anti-dazzle film, which comprises a light-transmitting base material and an anti-dazzle layer arranged on the surface of the light-transmitting base material, wherein the average spacing (Sm) of a concave-convex structure on the surface of the anti-dazzle layer is between 10 micrometers (mum) and 50 micrometers (mum), the arithmetic average roughness (Ra) of the concave-convex structure is between 0.02 micrometers (mum) and 0.08 micrometers (mum), and the maximum height roughness (Ry) is between 0.12 micrometers (mum) and 0.40 micrometers (mum).
In a preferred embodiment of the present invention, the light-transmissive substrate is a film with good mechanical strength and light transmittance, which includes but is not limited to polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), Polycarbonate (PC), triacetyl cellulose (TAC), Polyimide (PI), Polyethylene (PE), polypropylene (PP), polyvinyl alcohol (PVA), polyvinyl chloride (PVC), Cyclic Olefin Copolymer (COC), and other resin films.
In the preferred embodiment of the present invention, the selected light-transmitting substrate preferably has a light transmittance of more than 80%, preferably more than 90%. The thickness of the transparent substrate may be between 10 micrometers (μm) and 500 micrometers (μm), preferably between 15 micrometers (μm) and 250 micrometers (μm), and more preferably between 20 micrometers (μm) and 100 micrometers (μm).
The thickness of the anti-glare layer of the anti-glare film of the present invention on the light-transmitting substrate may be in the range of 2 micrometers (μm) to 10 micrometers (μm), preferably in the range of 3 micrometers (μm) to 9 micrometers (μm), and more preferably in the range of 4 micrometers (μm) to 7 micrometers (μm).
The anti-glare layer of the anti-glare film of the present invention comprises a plurality of organic fine particles, a plurality of silica nanoparticles, and a binder resin, wherein the silica nanoparticles are dispersed among the organic fine particles in the form of aggregates.
The plurality of organic fine particles may be fine particles of at least one material selected from the group consisting of acrylic resin, polystyrene resin, styrene-acrylic copolymer, polyethylene resin, epoxy resin, silicone resin, polyvinylidene fluoride resin, and polyvinyl fluoride resin, the particle size of which is preferably 5 micrometers (μm) or less, more preferably 0.5 micrometers (μm) to 4 micrometers (μm), and most preferably 1 micrometer (μm) to 3 micrometers (μm). In the present invention, organic fine particles having surfaces hydrophilically treated, which are advantageous to be dispersed in the antiglare layer, may be used, and the hydrophilization treatment may be, for example, hydrophilicity of the surfaces of organic fine particles modified by hydroxyethyl methacrylate (HEMA) or (meth) acrylonitrile, and the organic fine particles are preferably acrylic resin, styrene resin, or styrene/acrylic copolymer fine particles having surfaces hydrophilically treated. Further, since the amount of the plurality of organic fine particles used in the anti-glare layer affects the anti-glare property of the anti-glare layer, 3 to 12 weight percent (wt%) of the organic fine particles may be contained in the anti-glare layer, preferably 4 to 9 wt%. The refractive index of the organic particles may be 1.40 to 1.65, preferably 1.45 to 1.60, and the refractive index of the organic particles may be adjusted according to the refractive index of the binder resin.
The plurality of silica particles applicable in the antiglare layer of the antiglare film of the present invention are nanoscale particles having a particle size of 1 to 100 nanometers (nm), and the silica nanoparticles may be aggregated in a cluster or chain shape, wherein the secondary particle size (d50) of the silica nanoparticles may be 50 to 120 nanometers (nm), preferably, the secondary particle size (d50) is 70 to 110 nanometers (nm). In one embodiment of the present invention, the silica nanoparticles are siloxane-modified silica nanoparticles, and the siloxane-modified silica nanoparticles on the surface of the antiglare layer can provide the anti-settling property of the antiglare layer and reduce the granular sensation on the surface of the antiglare film, thereby providing the fineness of the surface of the antiglare layer. In another embodiment of the present invention, the plurality of silica nanoparticles are unmodified silica nanoparticles. The anti-glare layer may contain 3 to 12 weight percent (wt%) of silica nanoparticles, preferably between 4 and 9 wt%.
The binder resin used in the antiglare layer of the antiglare film of the present invention may be a radiation-curable acrylate-based polymer, and examples thereof include urethane acrylate, polyester acrylate, epoxy acrylate, melamine acrylate, polyfluoroalkyl acrylate, and silicone acrylate, and preferably an acrylate having a functionality of 3 or more.
Furthermore, in order to improve the curability and the hardness of the antiglare layer, one or more acrylic monomers may be added, such as 2-ethylhexyl acrylate (2-ethylhexyl acrylate), 2-hydroxyethyl acrylate (2-hydroxyethyl acrylate, HEA), 2-hydroxypropyl acrylate (2-hydroxypropyl acrylate), 2-hydroxybutyl acrylate (2-hydroxybutyl acrylate, HBA), butoxyethyl acrylate (butoxyethyl acrylate), 1,6-hexanediol diacrylate (1, 6-cyclohexanediol diacrylate, HDDA), trimethylolpropane formal acrylate (cyclic trimethylolpropane formal acrylate, CTFA), 2-phenoxyethyl acrylate (2-phenoxy acrylate, phenyl acrylate), tetrahydrofuran acrylate (tetrahydromethacrylate, lauryl acrylate), lauryl methacrylate (polyethylene glycol diacrylate, lauryl methacrylate), lauryl methacrylate (polyethylene glycol diacrylate, polyethylene glycol methacrylate, and the like, Dipropylene glycol diacrylate (DPGDA), tripropylene glycol diacrylate (TPGDA), hydroxytrimethylacetate (hydroxymethyacetate), pentaerythritol diacrylate (pentaerythrityl diacrylate), dipentaerythritol hexaacrylate (DPHA), trimethylolpropane triacrylate (trimethophan triacrylate, TMPTA), pentaerythritol triacrylate (pentaerythrityl triacrylate, PETA), isobornyl acrylate (isobornyl acrylate), and the like, but is not limited thereto.
In addition to the acrylate-based resin and the acrylic monomer, a photoinitiator may be added to the binder resin. In one embodiment of the present invention, the photoinitiator may be one that is released from methyl polymerization upon irradiation with light, and is not particularly limited, and those generally known in the art, such as acetophenones, diphenylketones, benzophenones, dibenzoyl, bifunctional α -hydroxy ketones, acylphosphine oxides, etc., may be used. In an embodiment of the invention, the aforementioned photoinitiators may be used alone or in admixture, preferably acetophenones, such as those commercially available
184 or Chemcure-481.
A fluorine-based or silicone-based leveling agent may be additionally added to the antiglare layer of the antiglare film of the present invention. The addition of the leveling agent to the antiglare layer can improve the coating surface, and the antiglare layer has surface lubricity, antifouling property, abrasion resistance and the like after coating or drying and molding. The leveling agent used for the antiglare film of the present invention may be, for example, silicone oil, a fluorine-based surfactant, and the like, and preferably a polyether-modified silicone or a fluorine-based surfactant having a perfluoroalkyl group, and the like.
Additives such as antistatic agents, colorants, flame retardants, ultraviolet absorbers, antioxidants, surface modifiers, and the like may also be added to the antiglare layer of the antiglare film of the present invention as needed.
The preparation method of the anti-dazzle film comprises the steps of uniformly mixing organic microparticles, silicon dioxide nanoparticles, acrylate resin, acrylic monomers, a photoinitiator, a flatting agent, an additive and the like by using a proper solvent to form an anti-dazzle layer composition; the anti-dazzle layer composition is coated on a transparent substrate, dried to remove a solvent, and then radiation cured to form the anti-dazzle layer on the transparent substrate.
The solvent used in the composition for an antiglare layer of the present invention is an organic solvent generally used in the technical field, for example, ketones, aliphatic or cycloaliphatic hydrocarbons, aromatic hydrocarbons, ethers, esters, and the like. One or more organic solvents may be used in the composition for the antiglare layer, and examples of suitable solvents include acetone, methyl ethyl ketone, cyclohexanone, methyl isobutyl ketone, hexane, cyclohexane, methylene chloride, dichloroethane, toluene, xylene, propylene glycol methyl ether, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, butanol, cyclohexanol, and tetrahydrofuran.
In another embodiment of the method for preparing the anti-glare film according to the present invention, the organic microparticles, the silica nanoparticles, the acrylic resin, the acrylic monomer, etc. may be mixed with a suitable solvent, and then mixed with a photoinitiator, a leveling agent, an additive, etc. to form the anti-glare layer composition.
The coating method of the antiglare layer composition of the present invention on a light-transmitting substrate may be a coating method generally used in the technical field, for example, a roll coating method, a doctor blade coating method, a dip coating method, a roll coating method, a spin coating method, a slit coating method, a wire bar coating method, or the like.
The anti-dazzle film can be combined with other functional optical films to form a composite optical film. A functional optical film such as a polarizing film may be used, wherein the polarizing film may be located on the other surface of the light-transmitting substrate of the antiglare film with respect to the antiglare layer.
The following examples are intended to further illustrate the invention, but the invention is not limited thereto.
Example 1
450 parts by weight of urethane acrylate (refractive index 1.49, available from IGM Resins, netherlands), 45 parts by weight of pentaerythritol triacrylate (PETA, available from korean special Chemical co.ltd)), 120 parts by weight of dipentaerythritol hexaacrylate (DPHA, available from korean special Chemical co.ltd)), and 40 parts by weight of photoinitiator Chemcure-481 (available from taiwan constant bridge industries, ltd.) were mixed, and 245 parts by weight of ethyl acetate and 100 parts by weight of butyl acetate were added and uniformly mixed to prepare an adhesive resin.
To 481 parts by weight of the binder resin prepared as described above were added 25 parts by weight of polymethyl methacrylate-styrene copolymer particles (average particle diameter 2 μm, refractive index 1.515, available from japan water accumulation chemical products limited), 73 parts by weight of a silica nanoparticle dispersion (d50 ═ 80nm, which is a methyl ethyl ketone dispersion having a solid content of 30%, available from german winning industry limited), 1 part by weight of polyether-modified polydimethylsiloxane (BYK-307, available from german BYK), 133 parts by weight of n-propyl acetate, 133 parts by weight of butyl acetate, and 153 parts by weight of methyl isopropyl ketone. The binder resin, the organic fine particles, the silica nanoparticles, the auxiliary agent and the solvent are fully mixed in a homogenizer to prepare the anti-dazzle layer composition.
The anti-glare layer composition thus obtained was coated on a PMMA substrate having a thickness of 80 μm by a slit coating method. The substrate coated with the antiglare layer composition was dried in an oven at 75 ℃ for 90 seconds, and then photo-cured with a UV lamp of 130mJ/cm2 radiation measurement to obtain an antiglare layer having a thickness of 4 μm on the substrate, and the antiglare film was subjected to optical measurement, hardness measurement, and surface roughness measurement, and the results obtained are shown in table 1.
Example 2
528 parts by weight of the binder resin obtained in example 1 was taken. To the binder resin were added 32 parts by weight of polymethyl methacrylate-styrene copolymer particles (average particle diameter 2 μm, refractive index 1.515, available from japan hydrojet chemical products limited), 80 parts by weight of a silica nanoparticle dispersion (d50 ═ 80nm, methyl ethyl ketone dispersion, solid content 30%, available from germany winning industry (stock) corporation), 1 part by weight of polyether-modified polydimethylsiloxane (BYK-307, available from germany BYK corporation) as an auxiliary agent, and 95 parts by weight of n-propyl acetate, 169 parts by weight of butyl acetate, and 95 parts by weight of ethyl acetate. The binder resin, the organic fine particles, the silica nanoparticles, the auxiliary agent and the solvent are fully mixed in a homogenizer to prepare the anti-dazzle layer composition.
The anti-glare layer composition thus obtained was coated on a PMMA substrate having a thickness of 80 μm by a slit coating method. The substrate coated with the antiglare layer composition was oven dried at 75 ℃ for 90 seconds and then photocured with a UV lamp with a radiation dose of 130mJ/cm 2. As a result of obtaining an antiglare layer having a thickness of 5 μm on the substrate, the antiglare film was subjected to optical measurement, hardness measurement and surface roughness measurement, and the results obtained are shown in Table 1.
Example 3
534 parts by weight of the binder resin obtained in example 1 were taken. To the binder resin were added 28 parts by weight of polymethyl methacrylate-styrene copolymer particles (average particle diameter 2 μm, refractive index 1.515, available from japan hydrojet chemical products limited), 81 parts by weight of a silica nanoparticle dispersion (d50 ═ 80nm, methyl ethyl ketone dispersion, solid content 30%, available from germany winning industry limited), 1 part by weight of polyether-modified polydimethylsiloxane (BYK-307, available from germany BYK) as an auxiliary agent, and 93 parts by weight of n-propyl acetate, 93 parts by weight of butyl acetate, and 171 parts by weight of methyl isopropyl ketone. The binder resin, the organic fine particles, the silica nanoparticles, the auxiliary agent and the solvent are fully mixed in a homogenizer to prepare the anti-dazzle layer composition.
The anti-glare layer composition thus obtained was coated on a PMMA substrate having a thickness of 80 μm by a slit coating method. The substrate coated with the antiglare layer composition was oven dried at 75 ℃ for 90 seconds and then photocured with a UV lamp with a radiation dose of 130mJ/cm 2. The results of obtaining an antiglare layer having a thickness of 5 μm on the substrate, and subjecting the antiglare film to optical measurement, hardness measurement and surface roughness measurement are shown in table 1.
Example 4
563 parts by weight of a binder resin (trade name PC8100FT, available from DIC of Japan) was added to the binder resin 24 parts by weight of polymethyl methacrylate-styrene copolymer particles (average particle diameter 2 μm, refractive index 1.515, available from hydrojet chemical Co., Ltd., Japan), 56 parts by weight of a silica nanoparticle dispersion (d50 ═ 80nm, methyl ethyl ketone dispersion, solid content 30%, available from BYK, Ltd., Germany), 1 part by weight of a polyether-modified polydimethylsiloxane (BYK-307, available from BYK, Germany) as an auxiliary, and 93 parts by weight of n-propyl acetate, 170 parts by weight of butyl acetate, and 93 parts by weight of butanol were added. The binder resin, the organic fine particles, the silica nanoparticles, the auxiliary agent and the solvent are fully mixed in a homogenizer to prepare the anti-dazzle layer composition.
The anti-glare layer composition thus obtained was coated on a PMMA substrate having a thickness of 80 μm by a slit coating method. The substrate coated with the antiglare layer composition was oven dried at 75 ℃ for 90 seconds and then photocured with a UV lamp with a radiation dose of 130mJ/cm 2. The results of obtaining an antiglare layer having a thickness of 5 μm on the substrate, and subjecting the antiglare film to optical measurement, hardness measurement and surface roughness measurement are shown in table 1.
Example 5
The procedure and materials of example 5 were the same as those of example 1, except that the silica nanoparticle dispersion was changed to a silica nanoparticle dispersion (d 50: 100nm, methyl ethyl ketone dispersion, 30% solid content, available from the company, winning industry, germany).
The anti-glare layer composition thus obtained was coated on a PMMA substrate having a thickness of 80 μm by a slit coating method. The substrate coated with the antiglare layer composition was oven dried at 75 ℃ for 90 seconds and then photocured with a UV lamp with a radiation dose of 130mJ/cm 2. The results of obtaining an antiglare layer having a thickness of 4 μm on the substrate, and subjecting the antiglare film to optical measurement, hardness measurement and surface roughness measurement are shown in table 1.
Example 6
534 parts by weight of the binder resin obtained in example 1 were taken. To the binder resin were added 28 parts by weight of polymethyl methacrylate-styrene copolymer particles (average particle diameter 2 μm, refractive index 1.515, available from accumulated water chemical products gmbh, japan), 81 parts by weight of a silica nanoparticle dispersion (d50 ═ 9nm-15nm (chain), which is an isopropyl alcohol dispersion having a solid content of 15% to 16%, available from chemical industries, ltd, japan), 1 part by weight of polyether-modified polydimethylsiloxane (BYK-307, available from BYK, germany) as an auxiliary agent, and 93 parts by weight of n-propyl acetate, 93 parts by weight of butyl acetate, and 170 parts by weight of methyl isobutyl ketone. The binder resin, the organic fine particles, the silica nanoparticles, the auxiliary agent and the solvent are fully mixed in a homogenizer to prepare the anti-dazzle layer composition.
The anti-glare layer composition thus obtained was coated on a PMMA substrate having a thickness of 80 μm by a slit coating method. The film coated with the antiglare layer composition was dried in an oven at 75 ℃ for 90 seconds and then photocured with a UV lamp with a radiant dose of 130mJ/cm 2. The results of obtaining an antiglare layer having a thickness of 5 μm on the substrate, and subjecting the antiglare film to optical measurement, hardness measurement and surface roughness measurement are shown in table 1.
Example 7
541 parts by weight of the binder resin obtained in example 1 were taken. To the binder resin were added 15 parts by weight of polymethyl methacrylate-styrene copolymer particles (average particle diameter 2 μm, refractive index 1.515, available from accumulated water chemical products gmbh, japan), 82 parts by weight of a silica nanoparticle dispersion (d50 ═ 9nm-15nm (chain), which is an isopropyl alcohol dispersion having a solid content of 15% to 16%, available from chemical industries, ltd, japan), 1 part by weight of polyether-modified polydimethylsiloxane (BYK-307, available from BYK, germany) as an auxiliary agent, and 94 parts by weight of n-propyl acetate, 94 parts by weight of butyl acetate, and 173 parts by weight of methyl isobutyl ketone. The binder resin, the organic fine particles, the silica nanoparticles, the auxiliary agent and the solvent are fully mixed in a homogenizer to prepare the anti-dazzle layer composition.
The anti-glare layer composition thus obtained was coated on a PMMA substrate having a thickness of 80 μm by a slit coating method. The substrate coated with the antiglare layer composition was oven dried at 75 ℃ for 90 seconds and then photocured with a UV lamp with a radiation dose of 130mJ/cm 2. The results of obtaining an antiglare layer having a thickness of 5 μm on the substrate, and subjecting the antiglare film to optical measurement, hardness measurement and surface roughness measurement are shown in table 1.
Determination of Properties
The antiglare film obtained in the above example was subjected to optical measurement, pencil hardness measurement, surface roughness measurement, antiglare property measurement, and the like in accordance with the measurement method of Japanese Industrial Standards (JIS).
The following measurements are made in the optical measurement section. The haze was measured by a measuring method of JIS K7361 using an NDH-2000 haze meter (manufactured by Nippon Denshoku industries Co., Ltd.). The light transmittance was measured by a method of JIS K7136 using an NDH-2000 haze meter (manufactured by Nippon Denshoku industries Co., Ltd.). Image clarity was measured by using a SUGA ICM-1T image clarity meter (manufactured by SUGA tester corporation, japan) according to the transmission method of JIS K7374 with 5 kinds of slit widths: image sharpness was measured at 0.125mm, 0.25mm, 0.5mm, 1mm and 2 mm. And (3) measuring the glossiness: measured by a BYK Micro-TRI-Gloss meter (manufactured by BYK-Chemie GmbH, Germany) according to JIS Z8741.
The pencil hardness of the antiglare films obtained in the foregoing examples was measured according to JIS K5400 using a mechanical pencil hardness tester using a Mitsubishi film material standard pencil. The film was measured under a pencil load of 500g at 45 degrees. The pencil hardness of the antiglare film measured by the pencil hardness measurement was the hardness of a pencil used when there were no scratches observed for more than 4 times in the 5-time pencil hardness test.
Surface roughness measurement the average spacing (Sm) of the uneven structure, the arithmetic average roughness (Ra) and the maximum roughness (Ry) of the uneven structure on the film surface were measured by JIS B0601-1994 using a MITUTOYO FORMTRACER CS-5000 surface roughness and a profilometer.
The anti-glare property was measured by attaching the anti-glare film prepared in the above examples to a black rubber plate and then visually observing the reflection of the lamp tube on the anti-glare film, where O represents a blurred reflection of the lamp tube and a halo around the lamp tube, and x represents a clearly visible reflection of the lamp tube.
As shown in table 1, the antiglare films obtained in examples 1 to 7 all had a light transmittance of 91% or more, a haze of 3.1 or less, and good hardness. Also, the anti-glare films obtained in examples 1 to 7 had a fine surface and provided good anti-glare properties through surface roughness analysis.
Table 1: optical Properties of anti-glare films obtained in examples 1 to 5
The measured values of the image clarity and the gloss of the antiglare films obtained in examples 1 to 7 are provided in table 2. From the experimental results provided in table 2, the antiglare films obtained in examples 1 to 7 all had good image clarity, suppressed contrast reduction in film surface whitening, and had good glossiness and were effective in suppressing glare to achieve an antiglare effect.
Table 2: clarity and glossiness of the antiglare films of examples 1 to 5
Fig. 1 and 2 are an image of the antiglare film produced in example 1 at a surface Scanning Electron Microscope (SEM) magnification of 18,000 and an image of the antiglare film at a cross-sectional Scanning Electron Microscope (SEM) magnification of 8,000, respectively. Fig. 1 shows an aggregate formed of organic fine particles and silica nanoparticles on the surface of the antiglare film of the present invention. As can be seen from fig. 2, in the antiglare layer, silica nanoparticles form continuous aggregates and organic microparticles are distributed in a binder resin. The silica nanoparticles and organic microparticles provide the desired haze while maintaining film surface fineness.
The above detailed description of the preferred embodiments is intended to more clearly illustrate the features and spirit of the present invention, and is not intended to limit the scope of the present invention by the preferred embodiments disclosed above. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims. The scope of the invention is therefore to be accorded the broadest interpretation so as to encompass all such modifications and equivalent arrangements as is within the scope of the appended claims.
Claims (10)
1. A low-haze antiglare film characterized by comprising:
a light-transmitting substrate; and
an antiglare layer provided on a surface of the light-transmitting substrate, the antiglare layer including a plurality of organic microparticles, a plurality of silica nanoparticles, and a binder resin, the silica nanoparticles being dispersed in the form of aggregates among the organic microparticles;
wherein the average interval of the concave-convex structure on the surface of the anti-dazzle layer is between 10 and 33 micrometers, the arithmetic average roughness is between 0.02 and 0.08 micrometers, and the maximum height roughness is between 0.12 and 0.40 micrometers; the haze of the low-haze anti-dazzle film is between 1.61% and 3.09%; the 20 ° gloss is between 38.2 and 53.7.
2. The low-haze antiglare film according to claim 1, characterized in that: the particle diameter of the plurality of silica nanoparticles used in the anti-dazzle layer is between 10 nanometers and 100 nanometers, and the secondary particle diameter is between 50 nanometers and 120 nanometers.
3. The low-haze antiglare film according to claim 1, characterized in that: the organic fine particles used in the antiglare layer are fine particles made of at least one material selected from the group consisting of an acrylic resin, a polystyrene resin, a styrene-acrylic copolymer, a polyethylene resin, an epoxy resin, a silicone resin, a polyvinylidene fluoride resin, and a polyvinyl fluoride resin, and the surfaces of the organic fine particles are subjected to hydrophilic treatment.
4. The low-haze antiglare film according to claim 3, characterized in that: the particle size of the organic microparticles is between 0.5 micron and 4 microns.
5. The low-haze antiglare film according to claim 1, characterized in that: the binder resin in the antiglare layer comprises an acrylate-based resin.
6. The low-haze antiglare film according to claim 1, characterized in that: the anti-glare layer contains 3 to 12 weight percent of the plurality of silica nanoparticles.
7. The low-haze antiglare film according to claim 1, characterized in that: the anti-dazzle layer contains 3 to 12 weight percent of the organic particles.
8. The low-haze antiglare film according to claim 1, characterized in that: the refractive index of the organic particles in the anti-dazzle layer is between 1.40 and 1.65.
9. The low-haze antiglare film according to claim 1, characterized in that: the thickness of the anti-dazzle layer on the light-transmitting substrate is between 2 and 10 microns.
10. A polarizing plate, comprising:
the low-haze antiglare film of any one of claims 1 to 9, and
a polarizing film on the other surface of the light-transmitting substrate of the antiglare film opposite the antiglare layer.
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| CN201810444940.8A CN108663732B (en) | 2018-05-10 | 2018-05-10 | Low-haze anti-dazzle film and polarizing plate |
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| JP6922278B2 (en) * | 2017-03-13 | 2021-08-18 | コニカミノルタ株式会社 | Phase difference reducing agent, optical film containing it, polarizing plate, and display device |
| TWI667303B (en) * | 2018-08-02 | 2019-08-01 | 明基材料股份有限公司 | Hard coating layered optical film , polarizer comprising the same, and image display comprising the hard coating layered optical film and/or the polarizer comprising the same |
| KR102325975B1 (en) * | 2019-01-08 | 2021-11-12 | 주식회사 엘지화학 | Optical laminate, polarizing plate, and display apparatus |
| KR102242549B1 (en) * | 2019-03-07 | 2021-04-20 | 주식회사 엘지화학 | Composition for optical film, optical film and display apparatus comprising the same |
| CN111366994A (en) * | 2020-03-03 | 2020-07-03 | 明基材料有限公司 | Anti-dazzle film and polarizing plate with same |
| CN113655554B (en) * | 2020-06-24 | 2024-03-26 | 明基材料有限公司 | Antiglare film and polarizing plate having the same |
| CN113671608A (en) * | 2020-06-24 | 2021-11-19 | 明基材料有限公司 | Anti-dazzle film and polarizing plate with same |
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| CN103998953A (en) * | 2011-12-26 | 2014-08-20 | 大日本印刷株式会社 | Anti-glare film, polarizing plate and image display device |
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| JPWO2008020612A1 (en) * | 2006-08-18 | 2010-01-07 | 大日本印刷株式会社 | Optical laminate manufacturing method, manufacturing apparatus, optical laminate, polarizing plate, and image display device |
| CN107718800B (en) * | 2010-10-22 | 2021-05-18 | 大日本印刷株式会社 | Anti-glare film, polarizing plate, and image display device |
| JP6078938B2 (en) * | 2012-03-15 | 2017-02-15 | 大日本印刷株式会社 | Optical film, polarizing plate, liquid crystal panel, and image display device |
| US9804300B2 (en) * | 2013-07-05 | 2017-10-31 | Dai Nippon Printing Co., Ltd. | Anti-glare film, polarizer, liquid-crystal panel, and image display device |
| TWI628457B (en) * | 2014-04-17 | 2018-07-01 | 日商大日本印刷股份有限公司 | Anti-glare film, polarizing plate, liquid crystal panel, and image display device |
| ES2836101T3 (en) * | 2014-11-28 | 2021-06-24 | Nippon Sheet Glass Co Ltd | Low reflection coated glass plate |
| TWI650234B (en) * | 2014-12-26 | 2019-02-11 | 凸版巴川光學薄膜股份有限公司 | Optical laminate, polarizing plate and display device |
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| TW201042293A (en) * | 2009-03-18 | 2010-12-01 | Toppan Printing Co Ltd | Antiglare film, polarizer, and transimissive liquid-crystal display |
| CN103998953A (en) * | 2011-12-26 | 2014-08-20 | 大日本印刷株式会社 | Anti-glare film, polarizing plate and image display device |
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