KR20090026860A - Glare-reducing film - Google Patents

Abstract

An anti-glare film is provided to prevent the padding of the inward of the binder region of the light-transmissive corpuscle by using the light-passing resin having the amorphous powder instead of the spherical powder. The anti- glare film(100) comprises the transparency based parts film(10) and anti-glare layer(20). The anti-glare layer is formed in one side of the transparency based film. The anti-glare layer is made of the light-passing resin forming the micro cavity. The light-passing resin is made by dispersing the light-transmissive powder(22) of the amorphous in the binder region(21). The light-passing resin composition is coated on the transparency based film by one of the coating methods of the cap, die, comma, knife, mayer bar, the micro gravure spin etc. The anti- glare film is completed by performing the ultraviolet ray process and the drying process on the light-passing resin composition.

Description

Antiglare Film {GLARE-REDUCING FILM}

The present invention relates to an antiglare film applied to a surface of a high-definition image display such as a cathode ray tube (CRT) and a liquid crystal display (LCD) used for image display of a navigation, a mobile phone, a computer, a television, and the like. More specifically, by using amorphous fine particles in place of conventional spherical fine particles in forming a light-transmitting resin coated on one surface of the antiglare film, within a certain total haze and clarity range, internal haze (internal) It relates to an antiglare film that minimizes haze.

Anti-glare film is installed in various image display devices such as liquid crystal display (LCD), plasma display panel (PDP), pre-developed light display (ELD), cathode ray tube (CRT), and the like. In order to prevent the visibility of an image from degrading by illumination, the incidence of sunlight from a window, and the projection of the shadow of a user, it is a film in which the fine concavo-convex structure was formed.

The anti-glare film is a type of forming an uneven shape on the surface of the anti-glare layer by agglomeration of particles such as coherent silica, a type of forming an uneven shape on the surface of the layer by adding organic fine particles having a particle diameter of a film thickness or more in the coating film to the resin, Alternatively, there is a type of lamination using a roll having irregularities on the surface of the layer and transferring the irregularities, and in particular, a method of forming a thin film by a coating technique having high productivity is used.

For example, Korean Patent No. 10-0352456 discloses an antiglare film prepared by dispersing fine particles in a layer to cause diffuse reflection effect.

When manufacturing an anti-glare film by the said coating, binder resin is used as a matrix for forming a film. Usually, such a binder resin has a refractive index of 1.45 to 1.55, so that the refractive index of each layer is appropriately adjusted by selecting the type and amount of the inorganic particles used therein. In particular, together with the high refractive index layer, translucent fine particles having a high refractive index for forming fine unevenness are required, and it is very important to uniformly disperse the translucent fine particles having high refractive index in a matrix having sufficient film strength without aggregation.

As described above, the conventional anti-glare film is intended to have a diffuse reflection and anti-glare effect by the action of the concave-convex shape on the surface of the anti-glare layer. In order to improve the anti-glare effect, the concave-convex shape formed as light-transmitting fine particles should be made larger. On the other hand, when the unevenness increases, the internal haze value increases, which causes a problem that the sharpness of the image decreases.

In addition, Japanese Patent Laid-Open No. 2001-194504 discloses, as shown in FIG. 4, light-transmitting fine particles 3 composed of a binder resin 2 and a metal alkoxide on one surface of the transparent base film 1, and a hydrolyzate thereof. An antiglare film formed by laminating a transparent resin layer is disclosed.

However, although the problems of hardness and scratch resistance have been improved, the present invention has a problem in that the light-transmitting fine particles 3 are embedded in the transparent resin layer so as to increase the internal haze, thereby not exhibiting sufficient anti-glare function.

In addition, the anti-glare film of the conventional type is mostly used for organic light-transmitting fine particles or mainly limited to silica and metal oxide of the inorganic light-transmitting fine particles, rarely mentioned the morphological effects such as spherical or plate-like, amorphous.

Organic or inorganic fine particles mainly used in conventional antiglare films have a spherical shape, and the material is also limited to silica or metal oxide in a certain size, so that the antiglare film using the same has high overall haze, while fine particles Due to the intrinsic haze value and refractive index of the fine particles themselves, it is difficult to produce an antiglare film that minimizes internal haze and maximizes surface haze effect and maintains a certain level of clarity.

The present invention is to solve the above problems, the object is to provide an anti-glare film that maximizes the overall surface haze effect while minimizing the internal haze.

In addition, it is an object to provide an antiglare film having excellent anti-glare and visibility by using the light-transmitting fine particles having a form and material different from those conventionally used so that the light-transmitting fine particles are not embedded in the binder resin.

The anti-glare film according to the present invention for solving the above problems is an anti-glare film comprising an anti-glare layer made of a light-transmissive resin formed with fine irregularities on at least one surface of the transparent base film, wherein the light-transmissive resin includes an ultraviolet curable resin, a photoinitiator It is made by dispersing and mixing amorphous translucent microparticles in binder resin.

Here, the amorphous light-transmitting fine particles are preferably at least one of amorphous organic fine particles or amorphous inorganic fine particles in order to minimize the internal haze and maximize the surface haze, thereby providing an anti-glare film exhibiting optimum anti-glare properties.

In addition, the amorphous organic fine particles are at least one of melamine beads, acrylic beads, acrylic-styrene beads, polycarbonate beads, polyethylene beads, vinyl chloride beads, silicon beads, the particle size distribution is 0.3 It is preferable to configure the fine particles to protrude to the surface of the transparent resin layer so as to realize an optimum anti-glare property.

The amorphous inorganic fine particles are at least one of calcium bicarbonate, light calcium carbonate, barium sulfate, zinc phosphate, silica, and talc, and the particle size distribution is 0.1 to 10.0 μm by using an inorganic material not used in the prior art as the fine particles. In order to express the most suitable haze characteristic, it is preferable.

In addition, in 100% by weight of the light-transmissive resin, the amorphous organic fine particles of 0.1 to 20% by weight, the inorganic inorganic particles of 0.1 to 15% by weight is preferable to maintain the internal haze value optimally.

In addition, the internal haze value of the antiglare film is 0.3 to 3.0%, the total haze value is 15.0 to 35.0%, and the NAS (Narrow Angle Scattering) value representing clarity is 35.0 to 55.0% is preferred in order to develop the best anti-glare properties in the entire haze and transparency range.

According to the anti-glare film according to the present invention, it is possible to provide an anti-glare film that maximizes the overall surface haze effect while minimizing the internal haze.

In addition, by using the light-transmitting fine particles having a form and material different from those conventionally used, it is possible to prevent the light-transmitting fine particles from being embedded in the binder resin, and to provide an anti-glare film having excellent anti-glare property and visibility.

Hereinafter, the antiglare film according to the present invention will be described with reference to the drawings.

1 is a cross-sectional view showing a laminated structure of the anti-glare film according to the present invention.

As shown in FIG. 1, the anti-glare film 100 according to the present invention includes an anti-glare layer 20 made of a light-transmissive resin having fine irregularities formed on at least one surface of the transparent base film 10. The resin is formed by dispersing and mixing the amorphous light-transmitting fine particles 22 in the binder resin 21.

In addition, as shown in FIG. 1, the antiglare film 100 according to the present invention is configured such that the amorphous light-transmitting fine particles 22 are condensed on the protruding portion among the uneven portions formed on the antiglare layer 20. Unlike the anti-glare film, the ratio of the light-transmitting fine particles embedded on the binder resin 21 was minimized, thereby maximizing the internal haze value.

I. Of anti-glare film (100)  Manufacturing method

The anti-glare film 100 according to the present invention is manufactured by forming an anti-glare layer 20 on at least one surface of the transparent base film 10, specifically, a binder containing amorphous light-transmitting fine particles 22 as an ultraviolet curable resin as a main component The translucent resin composition dispersed in the resin 21 is appropriately selected according to the characteristics of the composition among coating methods such as cap, die, comma, knife, mayer bar and micro gravure spin coating, and coated on the transparent base film 10. After the drying and ultraviolet irradiation process is prepared.

Specific examples of the ultraviolet light source is used to cure the liquid resin composition may include a super-high pressure mercury lamp, high pressure mercury lamp, low pressure mercury lamp, metal halide lamp or the like of the light source and the light quantity is to be cured using a 50 to 1500 mJ / cm ² Can be.

II. Antiglare film  Configuration

1. Transparent base film 10

The transparent base film 10 preferably uses a material having excellent transparency while requiring physical, mechanical, chemical strength, thermal stability, and moisture barrier property.

Examples of the material for forming the transparent base film 10 according to the present invention include cellulose resins such as triacetyl cellulose (TAC), diacetyl cellulose (DAC), propionyl cellulose and butyryl cellulose, and polymethyl methacrylate. Polyester resins, such as an acrylic resin, a polyurethane resin, polyethylene terephthalate, and a polyethylene naphthalate, styrene resin, such as a polycarbonate resin, polystyrene, an acrylonitrile-styrene copolymer, etc. can be used.

Polyolefin resins such as polyethylene, polypropylene, polyolefins having a cyclo-norbornene structure, polyolefin resins such as ethylene-propylene copolymers, amide resins such as vinyl chloride resins, nylon and aromatic polyamides, imide resins, Sulfone resin, polyether sulfone resin, polyether ether ketone resin, polyphenylene sulfide resin, vinyl alcohol resin, vinylidene chloride resin, vinyl butyral resin, allylate resin, polyoxymethylene A resin, an epoxy resin, or a blend of the resin may also be used as a material for forming the transparent base film 10.

In addition, it is preferable that the transparent base film 10 does not have coloring as much as possible. Accordingly, the film thickness direction expressed by Rth = [(nx + ny) / 2-nz] .d (where nx and ny are principal refractive indices in the film plane, nz is a refractive index in the film thickness direction and d is a film thickness). It is preferably used that the phase difference value of is from -90 nm to +75 nm. By using such a phase difference value (Rth) in the thickness direction of -90 nm to +75 nm, coloring (optical coloring) due to the transparent substrate can be almost eliminated. The phase difference value Rth in the thickness direction is more preferably -80 nm to +60 nm, particularly -70 nm to +45 nm.

The thickness of the transparent base film 10 is about 1-100 micrometers, Preferably it is about 5-80 micrometers, These films can also use a single | mono layer or two or more multilayer films.

2. Antiglare layer 20

The anti-glare layer 20 according to the present invention is formed by curing the translucent resin containing the amorphous translucent microparticles 22 in the binder resin 21, and the binder resin 21 is formed of the amorphous translucent microparticles 22. It is made to be easy to disperse, and after the translucent resin forms the antiglare layer 20, it is formed to correspond to sufficient strength as a film, preferably pencil hardness of H or higher, more preferably 2H or higher.

In order to provide the said anti-glare layer 20 and sufficient strength, it is preferable that it consists of at least 1 or more multilayers.

(1) binder resin (21)

Although the thermosetting resin, a thermoplastic resin, an ultraviolet curable resin, an electron beam curable resin, two-component mixed resin etc. are mentioned as binder resin 21 which has sufficient strength after hardening, and has transparency, Among these, in the hardening process by ultraviolet irradiation The ultraviolet curable resin which forms the effective anti-glare layer 20 by the simple processing operation by this is preferable.

The binder resin 21 according to the present invention is a resin which undergoes crosslinking polymerization reaction by irradiating ultraviolet rays and crosslinks to change into a polymer structure, and includes a reactive monomer, an oligomer, a prepolymer, and the like having a polymerizable unsaturated bond or an epoxy group in a molecule. Or mixed ultraviolet curable resin, a photoinitiator, etc. are mixed suitably.

UV curable resin

Examples of the ultraviolet curable resin include polyesters, acrylics, urethanes, amides, silicones, and epoxys, and the like, and ultraviolet curable monomers, oligomers, and polymers.

In order to improve the crosslinking density in consideration of the hardness, alkali resistance, solvent resistance, and abrasion resistance of the film, the ultraviolet curable resin used in the present invention is preferably an ultraviolet curable polyfunctional acrylate resin.

Curable resin that can be used in the present invention is not limited to the resin listed in the range as long as it shows the same effect.

UV-curable polyfunctional acrylate-based resin used in the present invention is dipentaerythritol hexaacrylate (dipentaerythritol hexaacrylte), tetramethylolmethane tetraacrylate, tetramethylolmethane triacrylate (tetramethylolmethane triacrylate), Trimethanolpropane triacrylate, 1,6-hexanediol diacrylate, 1,6-bis (3-acryloyloxy-2-hydroxypropyloxy) hexane [ Polyfunctional alcohol derivatives such as 1,6-bis (3-acryloyloxy-2-hydroxypropyl) hexane] and urethane acrylics such as polyethylene glycol diacrylate and pentaerythritol triacrylate Sole, hexamethylene diisocyanate urethane prepolymer, etc. It can be used in combination.

More preferably 1,6-hexanediol diacrylate, butanediol diacrylate, tripropylene glycol diacrylate, trimethylol propane triacrylate, pentaerythritol triacrylate, dipentaerythritol pentaacrylate Ultraviolet curable monomers such as dipentaerythritol hexaacrylate; Ultraviolet-curable oligomers, such as aliphatic difunctional urethane acrylate, aliphatic trifunctional urethane acrylate, aliphatic trifunctional urethane acrylate, and aromatic trifunctional urethane acrylate, are used alone or in combination.

It is preferable to use 10 weight%-90 weight% of said ultraviolet curable polyfunctional acrylate resin with respect to 100 weight% of curable resin, More preferably, it is 30 weight%-87 weight%. Even more preferably, 50 to 85% by weight is used.

When the ultraviolet curable polyfunctional acrylate resin is less than 10% by weight in 100% by weight of the light-transmissive resin composition forming the antiglare layer 20, the absolute number of functional groups is less than the desired hardness. However, there is a disadvantage that the torsion prevention and chemical resistance is weakened.

Ii) Photoinitiator

In the binder resin 21, an ultraviolet photoinitiator is used for effective polymerization, and specific examples thereof include diethoxyacetphenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzyldimethyl ketal, and 1-hydroxycyclohexyl. Acetphenones such as -phenyl ketone and 2-methyl-2-morphine (4-thiomethylphenyl) propane-1-one, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, etc. Benzoin ethers, benzophenone, methyl o-benzoylbenzoate, 4-phenylbenzophenone, 4-benzoyl-4'-methyldiphenylsulfonic acid, 4-benzoyl-N, N-dimethyl-N- [2- (1 -Oxo-2-propenyloxy) ethyl] benzophenones such as benzenemethananium bromide and (4-benzoylbenzyl) trimethylammonium chloride, 2,4-diethylthioxanthone, 1-chloro-4- Thioxanthones such as dichlorothioxanthone, 2, 4, 6-trimethylbenzoyldiphenylbenzoyl oxide and the like may be used alone or in combination. Can be. Moreover, as an accelerator (sensitizer), amine compounds, such as N, N- dimethyl paratoluidin, 4, 4'- diethylamino benzophenone, can be used individually or in mixture.

Preferably, acetphenones, benzophenones, hydroxycyclohexylphenyl ketones, thioxanthones, diphenylsulfite, dibenzyl disulfite, diethyloxide, triphenylbiimidazole, isopropyl-N, N-dimethyl Aminobenzoate etc. can be used individually or in mixture.

The content of the photoinitiator is preferably in the range of 0.1 wt% to 15 wt%, more preferably 3 wt% to 10 wt%, in 100 wt% of the light transmitting resin composition. When the content of the photoinitiator is less than 0.1% by weight, it is difficult to obtain a photopolymerization effect. When the content of the photoinitiator is more than 15% by weight, too much photoinitiator is added as compared to the photoinitiator effect, resulting in low economic efficiency.

Iii) additives

Additives, such as a leveling agent, a thixotropic agent, a dispersing agent (organic solvent), an antistatic agent, a hardening | curing agent, can be used for the binder resin 21 which concerns on this invention.

Among these, thixotropic agents include silica, mica, amide wax, polyethylene (PE) wax, etc., having a size of 0.1 μm. Thixotropy is applied to the binder resin 21 coating solution, and the light-transmitting fine particles By concentrating on the projecting portion of the transparent resin layer serves to prevent the light-transmitting fine particles are embedded. This property of the thixotropic agent is maximized by using the 'amorphous' light-transmitting fine particles 22 according to the present invention described below.

(2) amorphous Translucent  Particles (22)

The present invention is characterized in that the anti-glare layer 20 contains amorphous (optical) particles rather than conventional spherical fine particles, and the material is also made of bicarbonate (calcium bicarbonate), barium sulfate, etc., not silica or metal oxide. It is characterized by using a material.

Amorphous light transmitting fine particles are divided into organic light transmitting fine particles and inorganic light transmitting fine particles, and form their shapes in armophous.

The production method of the amorphous light-transmitting fine particles varies depending on the material, and in the present invention, any method may be used as long as it can obtain amorphous fine particles in which plate, square, sphere, oval and the like are mixed.

In general, by using a mill such as a ball mill (ball mill) to give a physical impact to the particles to produce a variety of forms using a physical grinding method, in the case of barium sulfate (BaSO ₄ ) of the inorganic light-transmitting fine particles In addition to the method by ball milling, it is possible to use a method of producing by sedimentation by chemical reaction using the characteristic of the specific gravity of barium sulfate.

In addition, in the case of the amorphous inorganic light-transmitting fine particles, in the crystallization process by chemical reaction, forms a unique crystal form (for example, plate-shaped, spherical, square, etc.) depending on the material, wherein the crystallized particles are agglomerated with each other As it tends to form agglomerates, a process of separating the individual particles is necessary.

Since the separation process is performed by a pulverizing operation using a crusher or a crusher such as a ball mill, even if the fine particles form a specific intrinsic crystal form of each material through a chemical reaction, it is pulverized into a random shape through the crushing process. And, by filtering this into a mesh of a certain size has a range of particle size distribution.

Translucent particles formed by the above process, it is possible to obtain the effect of adjusting the haze value and the clarity (Clarity) even with the use of a small amount, the anti-glare film 100 manufactured using this has a NAS (Narrow Angle Scattering) value At 35.0 to 55.0% transparency, optimal optical properties or anti-glare effects are exhibited.

Organic) Translucent  Particulate

Polymeric beads are used as amorphous organic light-transmitting fine particles used in the present invention, and melamine-based beads (refractive index: 1.57), acrylic beads (refractive index: 1.47), acrylic-styrene beads (refractive index: 1.54), poly Carbonate beads, polyethylene beads, vinyl chloride beads, silicon beads, and the like.

Acrylic beads used in the present invention are ethyl acrylate, butyl acrylate, amyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, cyclohexyl acrylate, benzyl acrylate, butyl methacrylate, 2-ethylhexyl Methacrylate, cyclohexyl methacrylate, benzyl hexyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, methyl acrylate, methyl methacrylate, benzyl methacrylate, vinyl acetate, styrene, acrylonitrile, Acrylic acid, methacrylic acid, maleic anhydride, itaconic acid, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, N-methylol acrylamide, acrylamide, methacrylamide, glycy Dilamide, lauryl acrylate, ethoxydiethylene glycol acrylate, methoxy triethylene glycol Colacrylate, phenoxyethyl acrylate, tetrahydrofuryl acrylate, isobornyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxy-3-phenoxy acrylate, neo Pentyl glycol diacrylate, 1,6-hexanediol diacrylate, trimethylol propane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, trimethylolpropane acrylate 8, 2-ethylhexyl methacrylate, n-stearyl methacrylate, cyclohexyl methacrylate, tetrahydrofurfuryl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxybutyl methacrylate, 1,6-hexanediol dimethacrylate, trimethylolpropane trimethacrylate, glycerin dimethacrylate Agent, glycerin dimethacrylate acrylate hexamethylene diisocyanate, pentaerythritol triacrylate is preferably a monomer or oligomer of hexamethylene diisocyanate used alone or in combination.

In addition, the styrene beads used in the present invention may be used alone or in combination with styrene, α-methylstyrene, α-ethylstyrene, o-ethylstyrene, p-ethylstyrene, 2,4-dimethylstyrene or vinyl toluene. desirable.

In addition, the silicone beads used in the present invention include an organic functional group, and the organic functional group may be various kinds such as methyl, ethyl, phenyl, and the like. Examples of the silicone-based beads containing the organic functional groups include polysiloxane, polysilane, Polycarbosilane or polysilazane may be used alone or in combination.

More preferably, polymethyl methacrylate, polystyrene, polycarbonate, polyethylene, melamine, polyvinyl alcohol, or the like is used alone or in combination in order to improve anti-glare properties.

The amorphous organic light transmitting fine particles used in the present invention preferably have a particle size distribution of 0.3 to 10.0 μm, more preferably 0.5 to 8.0 μm.

 If the particle diameter of the amorphous organic light-transmitting fine particles is smaller than 0.3 μm, it is difficult to obtain a satisfactory antiglare effect, and the light diffusibility is lowered, so that the image is discolored to aluminum color. In addition, when the particle diameter of the polymer beads is larger than 10 μm, the background of the screen is roughened due to the anti-glare particles, and the image contrast is deteriorated.

The content of the amorphous organic light transmitting fine particles is 0.1 to 20% by weight, preferably 5 to 18% by weight, and more preferably 10 to 15% by weight, based on 100% by weight of the light transmitting resin.

When the content of the amorphous organic light-transmitting fine particles is less than 0.1% by weight, anti-glare properties are hardly expected, and when the content of the amorphous organic light-transmitting fine particles exceeds 20% by weight, the antiglare effect efficiency is lowered compared to the total content of the light-transmissive resin composition.

Ii) amorphous weapons Translucent  Particulate

The amorphous inorganic light-transmitting fine particles used in the present invention are calcium bicarbonate (bicarbonate), light calcium carbonate, barium sulfate, silica, more preferably calcium bicarbonate, barium sulfate, and the like having a high specific gravity.

Moreover, it is preferable to mix and use 2 or more types of said amorphous organic translucent microparticles | fine-particles and amorphous inorganic translucent microparticles | fine-particles.

In the case where amorphous organic and inorganic light-transmitting fine particles are mixed, organic light-transmitting fine particles having a relatively small specific gravity are placed on the top of the light-transmitting resin, and inorganic light-transmitting fine particles having a relatively high specific gravity are appropriately mixed therein to the lower part of the light-transmitting resin. By positioning the light-transmitting fine particles to the protrusion of the anti-glare layer 20 by thixotropy of the light-transmissive resin coating solution, the internal haze is greatly reduced, so that the desired surface haze effect can be maximized. do.

The size of the amorphous inorganic light transmitting fine particles has a particle size distribution of 0.1 to 10.0 μm, preferably a particle size distribution of 0.3 to 8.0 μm.

When the particle size of the amorphous inorganic light-transmitting fine particles is less than 0.3 μm, the microparticles are too small to reduce micro-dispersion stability. When the particle size exceeds 10.0 μm, visible light scattering occurs due to a difference in refractive index with the binder resin 21. All.

In addition, the content of the amorphous inorganic fine particles is 0.1 to 15% by weight, preferably 0.5 to 10% by weight, more preferably 1 to 8% by weight.

If the content of the amorphous inorganic fine particles is less than 0.1% by weight it is difficult to expect the anti-glare effect, when the content of more than 15% by weight has a problem that the anti-glare effect is excessively reduced to significantly reduce the transmittance.

Hereinafter, the present invention will be described in more detail with reference to preferred examples of the present invention and comparative examples.

Example  One

A light-transmissive resin composition composed of the composition described in the 'Example 1' column of <Table 1> was used as the binder resin 21 on one side of an 80 μm triacetyl cellulose film, and the form was amorphous, the material was silica, and the size distribution was used. Is dispersed by adding inorganic translucent particles 22 having a thickness of 2 to 4 μm, coated using a bar coater, dried at 60 ° C. for 2 minutes, and then using an ultraviolet irradiation device {UV curing system: SMD-1000 (trade name)}. To harden at a light quantity of 500 mJ / cm ² to produce an anti-glare film. The enlarged surface X200 of the antiglare layer 20 manufactured as described above is illustrated in FIG. 2A.

Example  2

The translucent resin composition described in the "Example 2" column of <Table 1> was used as the binder resin 21, and the added translucent microparticles were used in the form of amorphous, material of polyethylene, and the organic translucent microparticles having a size of 4 to 7 탆. To produce an anti-glare film in the same process as in Example 1. The enlarged surface X200 of the antiglare layer 20 manufactured as described above is illustrated in FIG. 2B.

Example  3

Inorganic translucent microparticles | fine-particles which are amorphous, the material is calcium carbonate, and size distribution are 1-5 micrometers using the translucent resin composition described in the "Example 3" column of <Table 1> as binder resin 21, and adding the translucent microparticles | fine-particles The antiglare film was prepared in the same manner as in Example 1 by mixing and adding the organic light-transmitting fine particles having an amorphous form, a material of polyethylene, and a size distribution of 4 to 7 μm. The enlarged surface X200 of the antiglare layer 20 manufactured as described above is shown in FIG. 2C.

Comparative example  One

Using the light-transmissive resin composition described in the 'Comparative Example 1' column of <Table 1> as the binder resin 21, the added light-transmitting fine particles were spherical in form, silica, and inorganic light-transmitting fine particles having a size distribution of 3.5 to 6 μm. The anti-glare film was produced by the same process as Example 1 using. The enlarged surface X200 of the antiglare layer 20 manufactured in this way is as shown in FIG. 2D.

Comparative example  2

Using the light-transmissive resin composition described in the 'Comparative Example 2' column of <Table 1> as the binder resin 21, the added light-transmitting fine particles were spherical in shape, polymethylmethacrylate, and organic in size of 4 to 6 탆. An anti-glare film was produced in the same manner as in Example 1 using the light-transmitting fine particles. The enlarged surface X200 of the anti-glare layer 20 manufactured as described above is shown in FIG. 2E.

Raw material Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Kinds matter  UV curable oligomer  Aliphatic functional urethane acrylate 17.80 12.23 9.35 12.28 13.41 UV Curable Monomer  Hexanediol ethoxylate diacrylate 14.85 10.20 7.80 10.24 11.19    additive  Trimethylolpropane reacrylate 18.34 12.59 9.63 12.65 13.82 Methyl Isobutyl Ketone (MIBK) 9.90 6.80 5.20 56.58 50.48 Ethyl acetate 9.90 6.80 5.20 - - ethanol 19.80 13.60 39.40 - - toluene - 22.40 12.60 - - BYK-333 0.50 0.34 0.26 0.34 0.37  Photoinitiator  Hydroxycyclohexylphenylketone  7.92  5.44  4.16  5.46  5.97  Amorphous translucent particulates Amorphous silica beads (2.0 to 4.0㎛) 0.99 - - - - Amorphous PE (5.0-7.0 μm) - 9.60 5.40 - - Amorphous calcium bicarbonate (1.0 to 5.0㎛) - - 1.00 - - Spherical translucent particles Spherical Silica Beads (3.5-6.0 μm) - - - 2.44 - Spherical PMMA (4.0-6.0 μm) - - - - 4.76 Total weight% 100 wt%

<Table 2> is an evaluation of the characteristics of each of the transparency (Clarity) according to the total haze (TH), NAS (Narrrow Angle Scattering) value of the antiglare film according to Examples 1, 2, 3 and Comparative Examples 1, 2 The measurement results of the items are shown below.

Hayes and  transparency( NAS ) Definition and measuring principle

As shown in FIGS. 3A and 3B, haze and clarity (NAS) are both a unit of measuring diffuse transmittance of light, but specifically, haze is wide angle scattering. The difference is that NAS is a unit of measure for narrow angles within 2.5 °.

Table 2 shows the results of measuring the haze and transparency of the antiglare film according to the Examples and Comparative Examples using a measuring device (haze-gardplus, Byk Gardner, made in Germany).

Haze ( haze ) Value

(1) Internal haze (IH) value of the antiglare layer 20 of the same binder resin 21 on top of the antiglare layer 20 of the antiglare film 100 produced by the above Examples and Comparative Examples Clear coating by about 1.5 times to remove the anti-glare effect by the protrusions was measured using a measuring device (Haze-gardplus).

(2) Surface Haze (SH) represents a value derived through SH = TH-IH when the total haze is expressed as TH and the internal haze is expressed as IH.

(3) Total haze (TH, Total Haze) is the value which measured the haze value of the whole anti-glare film.

The haze defined as described above was measured using a measuring device (Haze-gardplus) for all the examples and comparative examples described in Table 1, and the measured values are described in Table 2.

transparency( Clarity )

Transparency was assessed by narrow angle scattering (NAS) values. NAS value is one of the criteria for evaluating the visibility of the antiglare film, in the present invention for all the above examples and comparative examples by measuring the NAS value by using the measuring equipment (Haze-gardplus, BYK Gardner) Table 2 It is described in.

Item unit Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Internal haze (IH)    % 1.34 1.42 1.98 8.57 5.64 Surface haze (SH) 22.39 24.15 21.09 12.56 15.43 Total haze (TH) 23.73 24.57 23.07 21.13 21.07 Transparency (NAS) 40.14 44.80 40.80 41.10 40.03

As shown in Table 2, the antiglare film according to the preferred embodiment of the present invention is in the range of similar total haze (TH), surface haze (SH) and transparency (NAS) compared to the antiglare film prepared by the comparative example. It can be seen that the internal haze (IH) value is less measured at.

2A to 2E, the antiglare layer 20 according to Examples 1, 2, and 3 of the present invention aggregates more light-transmitting fine particles 22 protruding to the surface than the antiglare layer according to the comparative example. It can be seen that. Therefore, as a small amount of microparticles | fine-particles, it has an effect which can adjust haze and transparency. As a result, when the NAS value is in the range of 35.0 to 55.0%, an antiglare film capable of maximizing the surface haze value while minimizing the internal haze value is obtained.

In conclusion, the present invention can provide an anti-glare film that minimizes internal haze (IT) within a certain transparency (NAS) range while maximizing the overall haze (TH) to improve image clarity and maximize anti-glare characteristics. have.

The scope of the present invention is not limited to the above embodiments but may be embodied in various forms of embodiments within the scope of the appended claims. Without departing from the gist of the invention as claimed in the claims, any person of ordinary skill in the art is considered to be within the scope of the claims based on the scope of the invention to various modifications possible.

In addition, the preferred range, more preferred range, even more preferred range limitation in the present invention is to maximize the effect even more, the narrower the narrower the scope can be obtained a more satisfactory technical effect.

1 is a cross-sectional view showing a laminated structure of an antiglare film according to the present invention,

2 is an enlarged view (X200) of the surface of an antiglare layer according to an embodiment of the present invention and a comparative example;

3 is a view showing the definition and the principle of measurement of haze and transparency (NAS) measured in Examples and Comparative Examples of the present invention,

Figure 4 is a cross-sectional view showing a laminated structure of the anti-glare film according to the conventional invention.

<Description of Major Symbols in Drawing>

1: transparent base film 2: binder resin

3: light-transmitting fine particle 10: transparent base film

20: antiglare layer 21: binder resin

22: light transmitting fine particles 100: antiglare film

Claims (6)

In the antiglare film provided with an antiglare layer made of a translucent resin having fine irregularities formed on at least one surface of the transparent base film, The translucent resin is formed by dispersing and mixing amorphous translucent microparticles in a binder resin containing an ultraviolet curable resin and a photoinitiator. The method of claim 1, The amorphous light-transmitting fine particles are anti-glare film, characterized in that at least one of amorphous organic fine particles or amorphous inorganic fine particles. The method of claim 2, The amorphous organic fine particles are at least one of melamine beads, acrylic beads, acrylic-styrene beads, polycarbonate beads, polyethylene beads, vinyl chloride beads, silicon beads, the particle size distribution is 0.3 to 10.0㎛ Antiglare film, characterized in that. The method of claim 2, The amorphous inorganic fine particles are at least one of calcium bicarbonate, light calcium carbonate, barium sulfate, zinc phosphate, silica, talc, and the particle size distribution of the antiglare film, characterized in that 0.1 to 10.0㎛. The method of claim 2, In 100% by weight of the light-transmissive resin, the amorphous organic fine particles of 0.1 to 20% by weight, the amorphous inorganic fine particles of the antiglare film, characterized in that 0.1 to 15% by weight. The method according to any one of claims 1 to 5, The internal haze value of the antiglare film is 0.3 to 3.0%, the total haze value is 15.0 to 35.0%, and the NAS (Narrow Angle Scattering) value of clarity is 35.0 to 55.0% Antiglare film characterized in that.

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