KR101182519B1 - Anti-glare coating composition and anti-glare coating film prepared by using the same - Google Patents

Abstract

The present invention relates to an anti-glare coating composition comprising an acrylic binder resin, a core-shell structured first filler having an average surface roughness (Rz) of greater than 0 and 2 μm or less, a second filler having surface irregularities, and a solvent, thereby preparing A display device comprising the anti-glare film and the anti-glare film.

Anti-glare, filler

Description

Anti-glare coating composition and anti-glare film produced using the same {Anti-GLARE COATING COMPOSITION AND ANTI-GLARE COATING FILM PREPARED BY USING THE SAME}

The present invention relates to an anti-glare coating composition and an anti-glare film using the same. Specifically, the present invention relates to an anti-glare coating composition which is excellent in storage stability, can provide excellent anti-glare properties, image sharpness and contrast, and is applicable to high resolution displays, and an anti-glare film prepared using the same.

In response to the recent high speed and high density of information transmission, diversification and multifunctionality of transmission media, and consumers demand high quality products such as large screen, high definition, multifunction and high functionality, flat panel display (FPD) Has appeared. As the size of the display becomes larger and thinner and the demand for notebook PCs increases, various types of flat panel displays such as LCD, PDP, and rear-projection TV have been developed and commercialized. However, when the display is exposed to external light such as natural light, the reflected light may cause fatigue or headache to the user's eyes, and may cause a problem that the image generated inside the display may not be recognized as a clear image. Doing.

In order to solve this disadvantage, an anti-glare effect has been realized by forming irregularities on the display surface to scatter external light from the surface. However, this causes a problem that image sharpness is degraded in a high resolution display. In order to improve this, a method of adding fine particles which induce internal scattering to a coating layer has been proposed.

Korean Patent No. 10-046782 discloses a first fine particle having an average diameter of 0.05 to 1 μm having an index difference of 0.2 to 0.5 and an acrylate binder resin and a second fine particle having an average particle size of 0.5 to 3 μm having a difference of refractive index not exceeding 0.1. Although it is described with respect to the anti-glare coating layer for a high resolution, there is a disadvantage that the contrast is lowered because the refractive index difference between the binder resin and the first fine particles is severe.

Meanwhile, Korean Patent No. 10-037840 and Japanese Patent Laid-Open No. 2001-3178 include at least two or more types of light-transmitting fine particles in a binder resin, and the refractive index of the light-transmitting fine particles is 0.03 or more and 0.2 or less and each light-transmitting fine particles Although it has been described with respect to the anti-glare coating layer characterized in that it has a different refractive index, there is a disadvantage in that the anti-glare property is lowered compared to the same image sharpness and haze value and the contrast is reduced due to the haze of 10% or more.

In addition, the Republic of Korea Patent No. 10-0296369 is characterized in that it comprises a light-transmitting diffuser in the binder resin, the external haze value by the surface irregularities is 7 to 30 and the internal haze value by the light-transmitting diffuser is 1 to 15 Although described for the anti-glare coating layer, there is a disadvantage that the contrast is lowered due to the high surface haze value.

Japanese Patent Application Laid-Open No. 2002-67675 discloses an anti-glare coating layer comprising a spherical fine particle having a refractive index of at least 1.55 and an amorphous fine particle having a refractive index of at least 1.48, and a binder resin having a thickness greater than or equal to an average diameter of the spherical fine particles. Although it is described, there is a disadvantage in that the anti-glare characteristics compared to the same sharpness and haze value.

Japanese Patent Laid-Open No. 2002-185927 is characterized in that the binder resin includes organic fine particles having an average diameter of 1 to 7 μm and inorganic fine particles having an average diameter of 0.1 μm or less, and a binder has a thickness of 0.3 to 3 times the average diameter of the organic fine particles. Although it is described with respect to the anti-glare coating layer, there is a problem that the anti-glare effect due to the fine particles is reduced because fine and uniform surface irregularities due to the inorganic fine particles can not be produced.

Japanese Patent No. 3507344 includes at least one light-transmitting fine particle in a binder resin, and the light-transmitting fine particle has a refractive index difference of 0.3 or less from the binder resin and protrudes from 0.1 to 0.3 μm from the surface of the binder resin layer. Although it is described with respect to the anti-glare coating layer, there is a problem in that the anti-glare characteristics compared to the same image sharpness and haze value.

Korean Patent Laid-Open Publication No. 10-2005-0006349 discloses a light absorbing layer including a metal oxide having a core-shell structure and a solar cell having the same, but the core is made of an amorphous metal oxide crystalline having a high refractive index and the shell It is composed of an amorphous or crystalline metal oxide, there is a problem that can not be used in the composition for anti-glare coating.

In general, in the anti-glare coating film, haze is related to external scattering due to the roughness of the surface of the coating layer and internal scattering by the filler in the binder resin, and the anti-glare effect is related to external scattering due to the surface roughness, and the sharpness of light is Is related to the degree of spread. The degree of diffusion of light is related to the difference in refractive index between the binder resin and the fine particles and the surface roughness of the coating layer. In particular, the rougher the surface of the coating layer, the lower the image sharpness. Therefore, the image sharpness and the anti-glare have a relationship that has the opposite result, how to control the surface roughness in the production of anti-glare coating film for high resolution display excellent in image sharpness and anti-glare can be an important technical element. .

In the case of spherical fine particles used in the prior art, it is difficult to manufacture an anti-glare coating film having excellent image sharpness and anti-glare property, and there are disadvantages in that RGB pixels are mixed due to the lens effect of the fine particles.

In general, in the case of using crosslinked organic fine particles, an appropriate solvent is used to monodisperse the fine particles. However, in this case, it is pointed out that the crosslinked fine particles are swelled and their surfaces become sticky, causing mutual collisions between fine particles and coagulation with each other, thereby impairing the storage stability of the coating composition. have.

As described above, in the related art, efforts have been made to ensure good image sharpness while sufficiently implementing an anti-glare effect in a flat panel display, and the present invention has been devised under such a technical background.

The present invention can provide an anti-glare film having excellent image sharpness and contrast as well as an anti-glare property, an anti-glare coating composition having excellent storage stability, an anti-glare film prepared using the same, and a display including the anti-glare film It is an object to provide a device.

In order to achieve the above object, the present invention is an glare comprising an acrylic binder resin, a first filler having a core-shell structure having an average surface roughness [Rz] of greater than 0 and 2 µm or less, a second filler having surface irregularities, and a solvent. Provide an anti-coat composition.

The present invention also provides an anti-glare film comprising an acrylic binder resin, a first filler having a core-shell structure having an average surface roughness (Rz) of greater than 0 and 2 µm or less, and a second filler having surface irregularities.

The present invention also provides a method for producing an anti-glare film comprising applying the anti-glare coating composition on a substrate and drying and curing the applied composition.

In addition, the present invention provides a display device including the anti-glare film.

The anti-glare coating composition according to the present invention can provide an anti-glare film having excellent image sharpness and contrast as well as an anti-glare property, so that it can be applied to a high resolution display, and its storage stability is excellent due to its excellent durability. This can be increased.

The anti-glare coating composition according to the present invention is characterized in that it comprises an acrylic binder resin, a first filler having a core-shell structure having an average surface roughness (Rz) of more than 0 and 2 µm or less, and a second filler having surface irregularities. .

In the present invention, the type of the acrylic binder resin is not particularly limited, and any kind known in the art may be used without particular limitation. Examples of the acrylic binder resin may be an acrylate monomer, an acrylate oligomer, a mixture thereof, or the like. In this case, the acrylate monomer or acrylate oligomer preferably comprises at least one acrylate functional group capable of participating in the curing reaction.

The kind of the acrylate monomer and the acrylate oligomer is not particularly limited, and may be used without particular limitation to those commonly used in the art.

As the acrylate oligomer, urethane acrylate oligomer, epoxy acrylate oligomer, polyester acrylate, polyether acrylate or a mixture thereof may be used. As said acrylate monomer, dipentaerythritol hexaacrylate, dipentaerythritol hydroxy pentaacrylate, pentaerythritol tetraacrylate, pentaerythritol triacrylate, trimethylene propyl triacrylate, propoxylated glycerol triacryl Preference, trimethyllopropane ethoxy triacrylate, 1,6-hexanediol diacrylate, propoxylated glycerol triacrylate, tripropylene glycol diacrylate, ethylene glycol diacrylate or mixtures thereof is preferred. It may be used to, but is not necessarily limited to these examples.

In the present invention, the first filler of the core-shell structure is an organic-inorganic composite having a structure consisting of a core and a shell surrounding the core. The first filler may play a role of inducing a pattern of irregularities on the surface of the anti-glare film, and scatters a light source incident from the outside at various angles by the rough surface of the shell, that is, the irregularities to recognize the user's vision. The effect of reducing the reflected light can be achieved. In addition, the first filler may provide excellent anti-glare properties as compared to particles composed only of an organic material or particles composed only of an inorganic material, and also contribute to improving wear resistance and scratch resistance.

It is preferable that the average refractive index difference with the said acrylic binder resin is 0.3 or less, and, as for the 1st filler of the said core-shell structure, it is more preferable that it is 0.02-0.2. Specifically, the first filler of the core-shell structure is preferably a difference between the average refractive index and the refractive index of the acrylic binder resin calculated as shown in Equation 1 below 0.3. When the difference in refractive index is less than the lower limit, it is difficult to obtain a sufficient haze value due to internal scattering, and when the upper limit is exceeded, the internal scattering increases and the haze value increases, while the transmittance decreases to decrease the contrast ratio.

Mean refractive index = [f _core n ² _core + f _shell n ² _shell ] ^0.5

In Equation 1, f _shell is calculated as (R ³ _{core - shell} -R ³ _core ) / R ³ _{core - shell} , which represents the volume fraction occupied by the shell in the total volume of the core-shell structure, f _core is calculated as _{(R core / R core-shell} ) 3, which the core - wherein the volume fraction of the core occupying the entire volume of the shell structure, R _core Represents the radius of the _core , and R _{core - shell} represents the radius of the core-shell structure.

Moreover, it is preferable that the average surface roughness [Rz] of the said 1st filler is 2 micrometers or less. Specifically, it is preferable that the average surface roughness [R _z ] of the first filler of the core-shell structure is calculated as in Equation 2 below. Even if there is no surface roughness of the first filler of the core-shell structure, the effect intended by the present invention can be sufficiently achieved, and even if the surface roughness is controlled to a certain degree, a desirable effect can be achieved. If the average surface roughness exceeds the upper limit, the image sharpness is lowered compared to the anti-glare, which is not preferable.

평균 표면 거칠기 = [R_z] = ,

Average surface roughness = [R _z ] =,

In Equation 2, R _zi is the height of each surface irregularities, and n represents the number of surface irregularities.

It is preferable that the first filler of the core-shell structure has a particle diameter of 0.5 to 5 탆. If the diameter is less than the lower limit, the scattering properties are lowered, so that it is not desirable to obtain a sufficient haze value. If the diameter is exceeded, the number of fillers per unit volume of the coating film decreases, so that the internal scattering effect is lowered, so that a sufficient haze value cannot be obtained. Not desirable

The shell of the first filler of the core-shell structure has a thickness of 0.01 to 2㎛, it is preferable that the refractive index difference with the acrylic binder resin is 1 or less. If the thickness of the shell is less than the lower limit, the thickness of the shell is too thin, so that the effect of improving physical properties, such as weak storage stability, is insignificant. If the upper limit is exceeded, the core-shell structure is not easily manufactured. Since the diameter of is increased and internal scattering effect is reduced, sufficient haze value cannot be obtained.

The core and the shell of the core-shell structure may be composed of a single material selected from organic materials and inorganic materials or a complex thereof, and the shell may be made of a material different from the material constituting the core.

At this time, the organic material that can be used as the core of the core-shell structure, polystyrene, polyacrylate-co-styrene, polymethylacrylate-co-styrene, polymethyl methacrylate-co-styrene, polycarbonate, Polyvinyl chloride, polybutylene terephthalate, polyethylene terephthalate, polyamide, polyimide, polysulfone, polyphenylene oxide, polyacetal, epoxy resin, phenol resin, melamine resin, benzoguanamine, polydivinylbenzene It is preferably a single or two or more copolymers selected from polydivinylbenzene-co-styrene, polydivinylbenzene-co-acrylate, polydiallylphthalate, and triallyl isocyanurate polymer. . The inorganic material that can be used as the core is one selected from silica, amorphous titanium oxide, amorphous zirconium oxide, indium oxide, aluminum oxide, amorphous zinc oxide, amorphous cerium oxide, barium oxide, calcium carbonate, amorphous barium titanate and barium sulfate Single or two or more complexes are preferred, but are not necessarily limited thereto.

On the other hand, the organic material that can be used as the shell of the core-shell structure is polydivinylbenzene, polydivinylbenzene-co-styrene, polydivinylbenzene-co-acrylate, epoxy resin, phenol resin, melamine resin, polydi It is preferred that it is a single or two or more copolymers selected from allylphthalate, and triallyl isocyanurate polymer. The inorganic material that can be used as the shell is selected from silica, titanium oxide, zirconium oxide, indium oxide, aluminum oxide, zinc oxide, cerium oxide, barium oxide, calcium carbonate, barium titanate, magnesium fluoride, calcium fluoride and barium sulfate One single substance or two or more complexes are preferred, but are not necessarily limited thereto.

In the present invention, the core is made of an organic material, the shell is preferably made of an inorganic material. As a specific example, it is preferable that the core is made of polyacrylate-co-styrene and the shell is made of silica particles. The polyacrylate-co-styrene may be a copolymer of polyfunctional acrylate and styrene. Preferred examples of the multifunctional acrylate include pentaerythritol triacrylate or pentaerythritol tetraacrylate, but are not limited thereto.

It is preferable that the weight ratio of the said polyfunctional acrylate and styrene is 5: 95-50: 50. It is preferable that the silica particle which comprises the said shell is 1-100 nm in average particle diameter, and the thickness of the said shell is 0.01-2 micrometers. The first filler composed of the core and the shell preferably has an average particle diameter of 3 µm and a refractive index of 1.45 to 1.6, preferably 1.52 to 1.59.

1 to 5 schematically illustrate various shapes of the first pillar of the core-shell structure. Referring to the figure, the shell with no surface roughness is coated with a shell having no surface roughness (type 1), and the shell with a surface roughness is coated with a shell having a surface roughness (type 2). ), Shell type without surface roughness on core with surface roughness (type 3), shell shape with type particles coated on spherical core without surface roughness (type 4) and particles with core with surface roughness There is a coated shell type (type 5).

In the present invention, the second filler having the surface irregularities is preferably contained in 0.5 to 30 parts by weight with respect to 100 parts by weight of the acrylic binder resin. If it is less than 0.5 parts by weight, the haze value due to internal scattering is not sufficiently realized. If it is more than 30 parts by weight, the viscosity becomes high, resulting in poor coating properties, and the haze value due to internal scattering is turned on so that the contrast ratio decreases. Not preferred.

It is preferable that the unevenness | corrugation formed in the surface of the said 2nd filler is 0.01-2 micrometers in height, the width is 0.01-4 micrometers, and the total distribution ratio is 10% or more of the whole surface of the said 2nd filler. Regarding the numerical range of the height and width of the unevenness formed on the surface of the second filler, if the lower limit is not reached, the unevenness formed by the fine particles is small, so that the scattering effect is small and the anti-glare improvement effect is not preferable. When the upper limit is exceeded, the image sharpness is lowered compared to the anti-glare, which is not preferable. With respect to the numerical range of the distribution ratio of the unevenness formed on the surface of the second filler, when the deviation is outside the numerical range, the effective number of unevenness for expressing the anti-glare improvement effect is small, which is not preferable because the effective anti-glare effect is hard to be expressed. .

As the material of the second filler, polydivinylbenzene, polydivinylbenzene-co-styrene, polydivinylbenzene-co-acrylate, polyfunctional acrylate, epoxy resin, phenol resin, melamine resin, polydiallyl phthalate And one or more copolymers selected from one of triallyl isocyanurate polymers, but is not necessarily limited thereto.

It is preferable that the said 2nd filler has a particle diameter of 0.05-5 micrometers. If the diameter is less than the upper limit, the scattering properties are deteriorated and sufficient haze value cannot be obtained, and if the diameter is exceeded, the number of fillers per unit volume of the coating film decreases, so that the internal scattering effect is reduced, thereby obtaining sufficient haze value. None is undesirable.

It is preferable that the average refractive index difference with the said acrylic binder resin is 0.3 or less, and, as for the said 2nd filler, it is more preferable that it is 0.02-0.2. If the difference in refractive index is less than the lower limit, it is difficult to obtain a sufficient haze value due to internal scattering, and when the upper limit is exceeded, the internal scattering increases and the haze value increases, while the transmittance decreases to decrease the contrast ratio.

In the present invention, the solvent is preferably contained in an amount of 50 to 500 parts by weight relative to 100 parts by weight of the acrylic binder resin. If the content of the solvent is less than the lower limit, the coating composition is too large to have poor coating properties, and if the solvent content exceeds the upper limit, the film strength of the coating film is lowered, making it difficult to manufacture a thick film, which is not preferable.

The solvent is not particularly limited, but is selected from C ₁ to C ₆ lower alcohols, acetates, ketones, cellosolves, dimethylformamide, tetrahydrofuran, propylene glycol monomethyl ether, toluene, and xylene Single or mixtures thereof and the like can be used.

The lower alcohols may be methanol, ethanol, isopropyl alcohol, butyl alcohol, isobutyl alcohol, or diacetone alcohol, and the like. The acetate may be methyl acetate, ethyl acetate, isopropyl acetate, butyl acetate, or cello. Solvent acetate may be used, and the ketones are preferably methyl ethyltone, methyl isobutyl ketone, acetylacetone, or acetone, but are not necessarily limited thereto. In the present invention, for example, a mixture containing alcohols such as isopropyl alcohol and diacetone and methyl ethyl ketone and cellosolve can be used.

The anti-glare coating composition according to the present invention is the acrylic binder resin, the first surface of the core-shell structure having an average surface roughness ([Rz]) of more than 0 and 2 µm or less for curing through UV irradiation, and a second surface having irregularities. In addition to the filler and the solvent, it may further include 0.1 to 10 parts by weight of UV curing initiator relative to 100 parts by weight of the acrylic binder resin. In this case, when the content of the UV curing initiator is less than the lower limit, it is not preferable because sufficient curing does not occur, and when the content exceeds the upper limit, the film strength of the coating film is lowered, which is not preferable.

The UV curing initiators include 1-hydroxy cyclohexylphenyl ketone, benzyl dimethyl ketal, hydroxydimethylacetophenone, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzoin butyl ether. One single substance or a mixture of two or more selected is preferable, but is not necessarily limited thereto.

The anti-glare coating composition according to the present invention is a leveling agent added to uniformize the surface of the coating film, a wetting agent and a coating solution added for the purpose of lowering the surface energy of the coating liquid so that the coating film is uniformly applied to the substrate during coating. It may further include one or more of an antifoaming agent, a dispersant added to remove the bubbles.

The present invention also provides a method for producing an anti-glare film comprising applying the anti-glare coating composition on a substrate and drying and curing the applied composition.

The substrate is not particularly limited as long as it is a transparent substrate, and those substrates commonly used in the art may be used. The transparent substrate preferably has a transmittance of at least 85%, a haze value of 1% or less, and a substrate having a thickness of 30 to 120 µm may be used. The transparent substrate may include triacetyl cellulose (TAC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), norbornene-based polymer, and the like. It is more preferable to use. The anti-glare film formed by the composition according to the present invention can provide excellent anti-glare, sharpness and contrast while protecting the transparent substrate.

The application method is not particularly limited and may be applied by a method commonly used in the art, such as roll coating or bar coating.

The curing may be performed by an electron beam (EB) or ultraviolet (UV), the drying thickness is preferably 1 to 20㎛. Curing conditions vary slightly depending on the blending ratio and components, but in the case of electron beam or ultraviolet curing, it is preferable to cure the irradiation amount at 200 to 1,000 mJ / cm 2 for 1 second to 10 minutes. In the electron beam or ultraviolet curing, when the curing time is less than 1 second, the binder is not sufficiently cured, and thus mechanical properties such as wear resistance are poor, and when the curing time is more than 10 minutes, yellowing occurs on the transparent substrate. I can't.

The present invention provides an anti-glare film comprising an acrylic binder resin, a first filler having a core-shell structure having an average surface roughness [Rz] of greater than 0 and 2 µm or less, and a second filler having surface irregularities.

It is preferable that the anti-glare film which concerns on this invention has a thickness of 1-20 micrometers, and is 15% or less of total haze, 10% or less of internal haze, and 5% or less of external haze. It is preferable that surface centerline roughness is 0.02-0.1 micrometer, and it is preferable that the surface uneven | corrugated pitch is 100-200 micrometers. In addition, it is preferable that the value which measured image sharpness according to JIS standard at 0.5 mm of optical projection width is 50 to 90%, and refractive index is 1.5 or more.

6 is a schematic view of the side cross-section of the anti-glare film according to the present invention.

The anti-glare film according to the present invention may include a substrate, which may be a transparent substrate used in the manufacturing method. In addition, the anti-glare film according to the present invention may further include a low reflection layer provided on the upper surface. In addition, the anti-glare film according to the present invention may further include a stain resistant layer provided on the upper surface.

In addition, the present invention provides a display device including the anti-glare film. The anti-glare film according to the present invention can be applied to any display that is required to prevent glare, not limited to the kind thereof. The display according to the present invention may have a structure known in the art except for the anti-glare film described above. The anti-glare film may be disposed at the outermost portion of the display that the viewer touches.

Hereinafter, the present invention will be described in more detail by way of examples. However, the following examples are only for illustrating the present invention, and the scope of the present invention is not limited thereto.

Example  One

(Preparation of Anti-Glare Coating Composition)

10 g of urethane acrylate oligomer, 20 g of dipentaerythritol hexaacrylate (DPHA) as an acrylate monomer, 1 g of a first filler having a core-shell structure having an average particle diameter of 3.5 μm and an average surface roughness ([R _z ]) of 30 nm, The average particle diameter is 4 µm, the height of the unevenness formed on the surface is 300 nm, the width of the unevenness is 800 nm, 1 g of a second filler, 30 g of methyl ethyl ketone and 38 g of toluene with an organic solvent, and 2 g of UV curing initiator are uniformly mixed. A composition for producing an antiglare film was prepared.

(Manufacture of anti-glare film)

The liquid anti-glare film production composition prepared by the above method using a roll coating on a transparent substrate layer (thickness 80 μm) made of triacetyl cellulose was applied to a dry thickness of 4.5 μm, and then irradiated with UV of 280 mJ / cm 2. Cured.

Example  2

The core-shell first filler used in Example 1 was replaced with a filler having a core-shell structure having an average particle diameter of 3.5 μm and an average surface roughness ([R _z ]) of 300 nm. After the same procedure as described in Example 1 to prepare a composition for producing an anti-glare film, using this to produce an anti-glare film.

Comparative example  One

The first filler used in Example 1 was replaced with a surface roughness filler (2 g) having an average particle diameter of 3.5 μm and a solid structure, and the coating thickness was 4 μm without using the second filler. Except for the application, it was carried out in the same manner as described in Example 1 to prepare an anti-glare film.

Comparative example  2

The anti-glare film was carried out in the same manner as described in Example 1, except that the amount (2 g) of the first filler and the second filler used in Example 1 was reduced to 0.1 g at the same ratio. After preparing the preparation composition, it was used to prepare an anti-glare film.

Comparative example  3

Except for using the amount of the first filler and the second filler (2g) used in Example 1 to 10g in the same ratio, was carried out in the same manner as described in Example 1 to prepare an anti-glare film After manufacturing, using this to produce an anti-glare film.

Comparative example  4

An anti-glare film was prepared in the same manner as described in Example 1, except that the first filler 2g was used without using the second filler in Example 1 and the coating thickness was applied such that the coating thickness was 4 μm. It was.

Comparative example  5

An anti-glare film was prepared in the same manner as described in Example 1, except that 2g of the second filler was used without using the first filler in Example 1.

Comparative example  6

Anti-glare was carried out in the same manner as described in Example 1, except that the first filler used in Example 1 was replaced with a filler (1 g) having an average particle diameter of 3.5 μm and having no spherical surface roughness. Film was prepared.

Comparative example  7

Except for replacing the second filler used in Example 1 with a filler (1g) having an average particle diameter of 4 ㎛ and no spherical uneven structure, it was carried out in the same manner as described in Example 1 to prevent glare Film was prepared.

Experimental Example  One

7 to 10 are electron scanning microscope (SEM) images taken to observe the surface roughness of the first filler and the surface irregularities of the second filler used in Examples 1, 2 and Comparative Example 1.

7 is an electron scanning microscope photograph of a first filler (Example 1) having a core-shell structure having an average particle diameter of 3.5 μm and an average surface roughness [R _z ] of 30 nm, and FIG. 8 shows an average particle diameter of 3.5 An electron scanning microscope photograph of the first filler (Example 2) having a core-shell structure having a mean surface roughness of 300 nm and a mean surface roughness, and FIG. 9 shows fine particles having a mean particle size of 3.5 μm and no mean surface roughness (Comparative Example 1 10 is an electron scanning microscope photograph of FIG. 10, and FIG. 10 is an electron scanning microscope photograph of a second filler (Example 1) having an average particle diameter of 4 µm, a height of irregularities formed on the surface thereof, and a width of irregularities of 800 nm. .

As can be seen from the photographs, it is possible to visually confirm the degree of surface roughness relative to each particulate.

Experimental Example  2

After measuring the physical properties of the anti-glare film prepared in Example 1, Example 2 and Comparative Examples 1 to 7 by the following conditions, the respective results are shown in Table 1 below.

A. Permeability (%)

The transmittance | permeability was measured using the HR-100 by Murakami Color Research Laboratory.

B. Haze value (%)

The haze value was measured using the HR-100 by Murakami Color Research Laboratory.

C. 60 ^o reflective gloss (Gloss)

60 ^o reflection gloss was measured using a micro-TRI-gloss from BYK Gardner.

D. Sharpness

Phase sharpness was measured using an ICM-1T from Sugar Test Instrument Co., Ltd.

E. Contrast

Dark room contrast and bright room contrast were measured according to Korean Industrial Standard (KS C IEC 61988-2-1).

F. Scratch Resistance

Steel wool (# 0000) Tied to 1 kg of hammer and rubbed 10 times on the anti-glare film was observed.

◎: number of scratches: 0

○: Number of scratches: 5 or less fine scratches of 1 cm or less

(Triangle | delta): Scratch number: More than 5 fine scratches of 1 cm or less, or 1 or more long scratches of 1 cm or more, 3 or less

×: Number of scratches: More than 3 long scratches of 1 cm or more

G. Storage Stability

(Circle): After 1 week, when manufacturing an anti-glare film using the said coating composition, when the haze value of a film, 60 ^o Gloss, 5% or less of a change of image sharpness is not used

X: After 1 week, when the anti-glare film was produced using the coating composition, when the film haze value, 60 ^o gloss, more than 5% without change in image sharpness

H. Pencil Hardness

Hardness was measured by testing three times for each pencil hardness at 500g load in accordance with ASTM D3363.

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Transmittance (%) 93.6 93.3 93.6 94.1 92.6 93.7 93.4 93.5 93.6 Haze value (%) 12.1 13 11.5 0.9 49 11.7 12.4 11.7 11.8 60 ^o Gloss 80 64 110 130 35 70 80 90 85 Sharpness 275 200 150 380 30 280 230 280 278 Contrast darkroom 225 220 220 300 180 220 220 221 220 Name room 533 528 530 540 502 530 535 530 530 Scratch resistance ◎ ◎ ◎ ◎ × ◎ ◎ ◎ ◎ Storage stability ◎ ◎ × ◎ ◎ ◎ ◎ ◎ ◎ Pencil Hardness (500g Load) 3H 3H 2H 3H 3H 2 ~ 3H 3H 3H 3H

As shown in Table 1, in Examples 1 and 2 using the first filler of the core-shell structure having the surface roughness and the second filler having the surface irregularities, the storage stability is excellent, the anti-glare characteristics and the image sharpness It can be seen that the contrast and pencil hardness are excellent. On the other hand, in Comparative Example 1 using only a filler having no surface roughness, the anti-glare property of the coating film was reduced to 110 ^o glossiness of 110 and the storage stability was lowered due to aggregation between the swollen particles. In addition, in Comparative Example 2 having the first filler and the second filler having a core-shell structure of less than 1 part by weight, the haze value was very low and the 60 ^o reflection glossiness was 130, indicating that the antiglare property of the coating film was very poor. In Comparative Example 3 in which the first filler and the second filler are more than 30 parts by weight, the anti-glare property is excellent, but it can be seen that the image sharpness is very low. It can be seen that the pencil hardness and the image sharpness of the comparative example 4 using the first filler alone and the comparative example 5 using the second filler alone were also lowered, respectively. In addition, it can be seen that the anti-glare properties of Comparative Example 6 using the first filler having no surface roughness and the second filler having the uneven structure and the comparative example 7 using the first filler having the surface roughness and the second filler having the uneven structure were deteriorated. Can be. However, when the first filler and the second filler are used in combination, they showed the best physical properties.

Optimal embodiments of the present invention described above have been disclosed. Although specific terms have been used herein, they are only used for the purpose of describing the present invention in detail to those skilled in the art and are not intended to limit the scope of the present invention as defined in the claims or the claims.

1 to 5 are diagrams schematically showing various shapes of the first pillar 12 having the surface roughness according to the present invention.

6 is a cross-sectional view of the anti-glare film according to an embodiment of the present invention.

7 is an electron scanning microscope (SEM) photograph of the first filler according to Example 1 of the present invention.

8 is an electron scanning microscope (SEM) photograph of the first filler according to Example 2 of the present invention.

9 is an electron scanning microscope (SEM) photograph of the first filler having no surface roughness according to Comparative Example 1 of the present invention.

10 is an electron scanning microscope (SEM) photograph of the second filler according to Example 1 of the present invention.

<< Explanation of symbols for main part of drawing >>

10 transparent substrate layer

11 anti-glare film

First filler of core-shell structure with 12 surface roughness

13 second filler having surface irregularities

Claims (23)

An acrylic binder resin, a first filler having a core-shell structure having an average surface roughness ([Rz]) of more than 0 and 2 µm or less, a second filler having surface irregularities and a solvent, Wherein said core is an organic material and said shell is an inorganic material. The anti-glare coating composition of claim 1, wherein the acrylic binder resin is an acrylate monomer, an acrylate oligomer, or a mixture thereof. The method of claim 2, wherein the acrylate oligomer comprises at least one member selected from the group consisting of urethane acrylate oligomer, epoxy acrylate oligomer, polyester acrylate and polyether acrylate, wherein the acrylate monomer is dipentaerythritol Hexaacrylate, dipentaerythritol hydroxy pentaacrylate, pentaerythritol tetraacrylate, pentaerythritol triacrylate, trimethylene propyl triacrylate, propoxylated glycerol triacrylate, trimethylpropane ethoxy triacrylate, At least one selected from the group consisting of 1,6-hexanedioldiacrylate, propoxylated glycero triacrylate, tripropylene glycol diacrylate and ethylene glycol diacrylate Anti-glare coating composition. The anti-glare coating composition of claim 1, wherein the core-shell structured first filler is included in an amount of 1 to 30 parts by weight based on 100 parts by weight of the acrylic binder resin. The anti-glare coating composition according to claim 1, wherein the first filler of the core-shell structure has a difference in average refractive index of 0.3 or less from the acrylic binder resin. The anti-glare coating composition of claim 1, wherein the core-shell structured first filler has a particle diameter of 0.5 to 5 μm. The anti-glare coating composition according to claim 1, wherein the shell of the first filler of the core-shell structure has a thickness of 0.01 to 2 µm and a difference in refractive index from the acrylic binder resin is 1 or less. delete The method of claim 1, wherein the core is polystyrene, polyacrylate-co-styrene, polymethylacrylate-co-styrene, polymethylmethacrylate-co-styrene, polycarbonate, polyvinylchloride, polybutylene terephthalate, Polyethylene terephthalate, polyamide, polyimide, polysulfone, polyphenylene oxide, polyacetal, epoxy resin, phenol resin, melamine resin, benzoguanamine, polydivinylbenzene, polydivinylbenzene-co-styrene, An anti-glare coating composition wherein the organic material is one single or two or more copolymers selected from polydivinylbenzene-co-acrylate, polydiallylphthalate, and triallyl isocyanurate polymer. The method of claim 1, wherein the shell is selected from silica, titanium oxide, zirconium oxide, indium oxide, aluminum oxide, zinc oxide, cerium oxide, barium oxide, calcium carbonate, barium titanate, magnesium fluoride, calcium fluoride and barium sulfate An anti-glare coating composition that is an inorganic one or a complex of two or more. delete The anti-glare coating composition of claim 1, wherein the core consists of polyacrylate-co-styrene and the shell consists of silica particles. The antiglare coating composition of claim 12 wherein the polyacrylate-co-styrene is pentaerythritol triacrylate or a copolymer of pentaerythritol tetraacrylate and styrene. The anti-glare coating composition of claim 1, wherein the second filler comprises 0.5 to 30 parts by weight based on 100 parts by weight of the acrylic binder resin. The antiglare coating composition of claim 14 wherein the second filler is made of silica. The anti-glare coating composition of claim 1, wherein the solvent is included in an amount of 50 to 500 parts by weight based on 100 parts by weight of the acrylic binder resin. The anti-glare coating composition of claim 1, further comprising at least one of a UV curing initiator, a leveling agent, a wetting agent, an antifoaming agent, and a dispersant. Claims 1 to 7, 9, 10, and 12 to 17 of the anti-glare coating composition comprising the step of applying a coating composition according to any one of the substrate on the substrate and drying and curing the applied composition Way. An anti-glare film produced using the anti-glare coating composition according to any one of claims 1 to 7, 9, 10, and 12 to 17. The anti-glare film according to claim 19, further comprising a substrate provided on at least one side of the anti-glare film. The anti-glare film according to claim 19, further comprising a low reflection layer provided on at least one surface of the anti-glare film. 20. The antiglare film of claim 19 further comprising a fouling resistant layer hollowed on at least one surface of the antiglare film. Display device comprising the anti-glare film according to claim 19.

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