KR101251720B1 - Anti-glare film and anti-glare composition for preparing the same - Google Patents

Abstract

The present invention transparent substrate layer; And an anti-glare film including an anti-glare layer including a binder resin and a filler having a lower refractive index than the transparent base layer, and an anti-glare composition for manufacturing the same. By using a binder resin having a lower refractive index than that of the transparent base layer, higher image sharpness can be exhibited, and a low distortion and anti-glare effect can be realized in a high resolution display device.

Description

Anti-glare film and anti-glare composition for manufacturing the same {ANTI-GLARE FILM AND ANTI-GLARE COMPOSITION FOR PREPARING THE SAME}

The present invention relates to an anti-glare film and an anti-glare composition for producing the same. More specifically, the present invention relates to an anti-glare film having an anti-glare effect while maintaining a high brightness and high contrast ratio, and an anti-glare composition for manufacturing the same.

Recently, as liquid crystal display (LCD) televisions and plasma display panel (PDP) televisions have been widely spread to real life, the flat panel display market is rapidly developing.

When the display is exposed to external light such as natural light, the surface reflected light causes eye fatigue or headache, and an image generated inside the display may not be clearly formed in the eye. As a result, there is a growing demand for surface coatings that provide various functions to the surface of a display.

Accordingly, research on the antireflection film that coats the display surface with a single layer or multiple layers and reduces the reflectance by inducing the extinction interference of the reflected light induced in each coating layer has been actively conducted.

The same thing as patent document 1 is mentioned as a conventional technique with respect to an antireflection film. In the said patent document 1, the light-diffusion film which light diffused in the inside of the film was manufactured using the organic filler which has a refractive index difference with a binder. However, when using a light diffusing film, there is a problem that the brightness and contrast are lowered, there is still a need for improvement.

JP 1999-138712 A

In order to solve the conventional problems as described above, an object of the present invention is to provide an anti-glare composition that can provide an anti-glare function and at the same time provide an excellent contrast, an anti-glare film prepared using the same.

In order to achieve the above object, the present invention is a transparent substrate layer; And it provides an anti-glare film comprising an anti-glare composition comprising a binder resin and a filler having a lower refractive index than the transparent base layer.

The present invention also provides an anti-glare composition comprising a binder resin and a filler having a lower refractive index than the transparent base layer.

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

In the present invention, by using a binder resin having a refractive index lower than that of the transparent base layer, the image display exhibits higher image sharpness and thus has less distortion in the display device for high resolution. In addition, the anti-glare film according to the present invention by showing a low reflectance, it is possible to implement the anti-glare effect by low reflection.

Hereinafter, the present invention will be described in detail.

The anti-glare film according to the present invention may include an anti-glare layer including a binder resin and a filler having a lower refractive index than the transparent base layer on the transparent base layer.

As the transparent base layer, a plastic film is used, and a film or sheet formed of various organic polymers may be used. In general, the transparent substrate used in the display device is considered to have physical properties such as transparency, refractive index of light, impact resistance, heat resistance, and durability, and polyolefine (polyethylene, polypropylene, etc.), poly Polyesters (polyethylene terephthalate, polybutylene terephtalate, etc.), celluloses (triacetylcellulose, cellophane), polyamides (nylons) -6 (nylon-6), nylon-66 (nylon-66), etc., acryl (polymethyl methacrylate, etc.), polystyrene, polyvinyl chloride, Organic polymers such as polyimide, polyvinyl alcohol, polycarbonate, and ethylenen vinyl alcohol It may be used, specifically, one or more materials selected from triacetyl cellulose (TAC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC) and norbornene-based polymers may be used. However, the present invention is not limited thereto, and other materials generally used in the art to manufacture the transparent substrate layer may be used.

The average refractive index of the transparent base layer is not particularly limited, but is preferably within the range of 1.45 to 2.0.

The transparent base layer preferably has a light transmittance of at least 50% of visible light, and more preferably 80% or more of visible light.

The binder resin preferably has a refractive index lower than that of the transparent base layer, and more preferably, the refractive index is 1.40 to 1.57.

When the refractive index of the binder resin is lower than that of the transparent base layer, external light may be scattered on the binder resin by a difference in refractive index between the substrate and the binder resin, thereby realizing an anti-glare effect. In particular, the refractive index difference between the anti-glare layer formed by curing the binder resin and the transparent base layer is preferably within the range of 0.02 ~ 1.0. When the difference in refractive index between the transparent base layer and the anti-glare layer exceeds 1.0, the contrast ratio may be lowered. If the difference is less than 0.02, the anti-glare effect may be minimal.

The binder resin may be a sol-gel reactant using a silane compound and a fluorine-based alkyl silane and / or a mixture of a polyfunctional acrylate monomer and a fluorine acrylate.

Examples of the fluorine-based alkylsilanes include one or two or more substances selected from the group consisting of tridecafluoro octyltriethoxysilane, heptadecafluorodecyltrimethoxysilane, heptadecafluoro decyltriisopropoxysilane, and the like. It may be mentioned, but is not limited thereto.

The content of the fluorine-based alkylsilane is preferably 5 to 70 parts by weight based on 100 parts by weight of the binder resin. If it is less than 5 parts by weight, it is difficult to obtain a desired refractive index value, and if it is more than 70 parts by weight, strength and hardness may be deteriorated.

In particular, the binder resin preferably contains a fluorine acrylate. The anti-glare layer made of a binder containing a fluorine acrylate has a low refractive index, and the larger the content of the fluorine acrylate, the lower the refractive index. In addition, when the fluorine-based acrylate content of the anti-glare layer increases, it becomes difficult to attach contaminants, thereby improving the antifouling property.

The fluorine-based acrylate may be fluoro urethane acrylate, fluoro epoxy acrylate, fluoro ester acrylate, fluoro ether acrylate and the like.

The content of the fluorine-based acrylate is preferably 5 to 70 parts by weight based on 100 parts by weight of the binder resin. If it is less than 5 parts by weight, it is difficult to obtain a desired refractive index value, and if it is more than 70 parts by weight, strength and hardness may be deteriorated.

The type of the polyfunctional acrylate monomer is not particularly limited and may be selected without particular limitation as long as it is known in the art. As an example of the said polyfunctional acrylate monomer, an acrylate monomer, an acrylate oligomer, a mixture thereof, etc. can be used. 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 triacrylate , Trimethyllopropane ethoxy triacrylate, 1,6-hexanediol diacrylate, propoxylated glycerol triacrylate, tripropylene glycol diacrylate, ethylene glycol diacrylate or mixtures thereof, and the like are preferable. Although it may be used, it is not necessarily limited to these examples.

The refractive index of the said filler is 1.20-1.65, and a three-dimensional structure is not specifically limited, An amorphous thing can also be used. It is generally safe to use something that is spherical or elliptical.

The filler can be used without limitation organic particles and inorganic particles. As the organic particles, polystyrene, polymethyl methacrylate, polymethyl acrylate, polyacrylate, polyacrylate-co-styrene, polymethylacrylate-co-styrene, polymethylmethacrylate-co-styrene, poly Carbonate, polyvinyl chloride, polybutylene terephthalate, polyethylene terephthalate, polyamide, polyimide, polysulfone, polyphenylene oxide, polyacetal, epoxy resin, phenol resin, organic silicone resin, melamine resin, benzogu Single or two or more copolymers selected from amine, polydivinylbenzene, polydivinylbenzene-co-styrene, polydivinylbenzene-co-acrylate, polydiallylphthalate and triallyl isocyanurate polymer Exemplified by one single substance or a mixture of two or more selected. Silica is mentioned as an example of the said inorganic particle.

The filler may be used by mixing one or more kinds of one or more kinds, but it is preferable to use one or more kinds of mixtures having a refractive index lower than that of the transparent base layer to increase the anti-glare effect.

It is preferable that the particle diameter of the said filler is 0.1 micrometer-20 micrometers. If it is less than 0.1 micrometer, sufficient unevenness | corrugation will not be obtained and if it is more than 20 micrometers, transparency will fall.

The filler is preferably added in 30 parts by weight or less based on 100 parts by weight of the anti-glare composition. If it exceeds 30 parts by weight, the viscosity becomes high, coating property is poor, and the haze value due to internal scattering becomes too large, and the contrast ratio is lowered.

The anti-glare film of the present invention, by applying the anti-glare composition of the present invention on a transparent base film and then curing the anti-glare film can be produced.

As the curing method, photocuring or thermosetting may be used. For example, in the case of fluorine-based acrylate, a photoinitiator may be used, and in the case of fluorine-based alkylsilane, thermosetting may be performed. The thermal curing may be cured in a high temperature oven, the photoinitiator may be a UV curing initiator, but is not limited thereto.

The anti-glare film preferably has a thickness of 1 to 20 μm, but is not limited thereto.

It is preferable that the said anti-glare film is 100 or more of image sharpness, 4% or less of reflectance, and 50 or more of contrast. In particular, it is preferable to show high image sharpness of 180 or more on the same external visual image. In this case, there is little distortion of the image in the high resolution display device.

The anti-glare composition according to the present invention is characterized by including a binder resin and a filler having a lower refractive index than the transparent base layer.

The antiglare composition is preferably contained in an amount of 50 to 500 parts by weight based on 100 parts by weight of the binder resin. When the content of the solvent is less than the lower limit, the coating composition is too large to have poor coating properties, and when the solvent content exceeds the upper limit, the film strength of the coating film is lowered, and it is difficult to manufacture a thick film. It may further comprise a solvent added in parts by weight.

The solvent is not particularly limited, but any one selected from C1 to C6 lower alcohols, acetates, ketones, cellosolves, dimethylformamide, tetrahydrofuran, propylene glycol monomethyl ether, toluene, and xylene or Mixtures thereof, but are not limited thereto.

The anti-glare composition may further include at least one additive selected from a leveling agent, a wetting agent, an antifoaming agent and silica having an average particle diameter of 1 to 50 nm.

The leveling agent can make the surface of the coating film coated using the composition for anti-glare film according to the present invention.

As the wetting agent serves to lower the surface energy of the composition for anti-glare film according to the present invention, when coating the composition for anti-glare film on a transparent base layer, it can be made uniform coating.

The antifoaming agent may be added to remove bubbles in the composition for anti-glare film according to the present invention.

The additive is preferably added in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the antiglare composition.

The anti-glare composition may further include a curing initiator.

The photocuring initiator is a substance that promotes polymerization of the resin component according to irradiation of active energy rays such as ultraviolet rays, and is 1-hydroxy cyclohexylphenyl ketone, benzyl dimethyl ketal, hydroxydimethylacetophenone, benzoin, benzoin methyl It may be a single or a mixture of two or more selected from ether, benzoin ethyl ether, benzoin isopropyl ether, and benzoin butyl ether. However, it is not limited to this.

The curing initiator is preferably added in 0.1 to 10 parts by weight based on 100 parts by weight of the anti-glare composition. If less than 0.1 part by weight, sufficient curing may not occur, and thus the hardness of the film may be lowered. If it exceeds 10 parts by weight, the anti-glare film may have a low flexibility and cracks may occur.

The display device including the anti-glare film according to the present invention can be manufactured using a conventional technique except that the anti-glare film of the present invention is attached to the front of the screen.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the scope of the present invention is not limited to the following examples.

Example

Example  One

<Preparation of anti-glare composition>

50 g of a sol-gel reactant (refractive index 1.42) using a silane compound and a fluorine alkylsilane, 1 g of polymethyl methacrylate (PMMA) particles having an average particle diameter of 3.5 μm, 1 g of silicon particles having an average particle diameter of 4 μm, methyl ethyl ketone 30 g as a solvent, 1 g of the additive was uniformly mixed to prepare a composition for producing an anti-glare film.

<Manufacture of anti-glare film>

Applying the anti-glare composition of the liquid prepared by the above method on a transparent substrate layer (thickness 80㎛) made of triacetyl cellulose to a dry thickness of 3.5 ~ 4.5㎛ and then cured in an oven at 90 degrees An anti-glare film having a haze of 9.9 was prepared.

Example  2

<Preparation of anti-glare composition>

25 g of polyfunctional acrylate monomer, 5 g of fluorine acrylate, 30 g of methyl ethyl ketone, 38 g of toluene, and 2 g of UV curing initiator were uniformly mixed to prepare a binder resin composition (refractive index of 1.45), and then polymethyl having an average particle diameter of 3.5 µm. 1 g of methacrylate (PMMA) particles and 1 g of silicon particles having an average particle diameter of 4 μm were mixed to prepare a composition for producing an anti-glare film.

<Manufacture of anti-glare film>

UV curing after applying the composition for preparing a liquid anti-glare film prepared by the above method using a roll coating on a transparent substrate layer (thickness 80㎛, refractive index about 1.52) made of triacetyl cellulose so that the dry thickness is 3.5 ~ 4.5㎛ Through the anti-glare film of Haze 9.3 was prepared.

Comparative example

<Preparation of anti-glare composition>

After uniformly mixing 25 g of polyfunctional acrylate monomer, 5 g of urethane acrylate oligomer, 30 g of methyl ethyl ketone, 38 g of toluene, and 2 g of UV curing initiator were prepared to prepare a binder resin composition (refractive index of about 1.53), the average particle diameter of 3.5 μm 1 g of polymethyl methacrylate (PMMA) particles and 1 g of silicon particles having an average particle diameter of 4 µm were mixed to prepare a composition for producing an anti-glare film.

<Manufacture of anti-glare film>

UV curing after applying the composition for preparing a liquid anti-glare film prepared by the above method using a roll coating on a transparent substrate layer (thickness 80㎛, refractive index about 1.52) made of triacetyl cellulose so that the dry thickness is 3.5 ~ 4.5㎛ Through the anti-glare film of Haze 9.3 was prepared.

Experimental Example

The physical properties of the films described below were performed for Examples 1 and 2 and Comparative Examples, and the results were shown in Table 1 below.

How to measure

A. Transmittance / Haze (%): The transmittance and haze value were measured using HM-150 of Murakami Color Research Laboratory according to JIS-K-7105.

B. 60 ° Reflection Glossiness: 60 ° Reflection Glossiness was measured using a micro-TRI-gloss manufactured by BYK Gardner.

C. Sharpness (%): The sharpness was measured using ICM-1T of Suga Test Instrument Co., Ltd.

D. Contrast: Clear room contrast (CR) was measured according to Korean Industrial Standard (KS C IEC 61988-2-1).

E. Reflectance (%): The reflectance was measured using Solid Spec-3700 manufactured by Shimadzu.

Film type Transmittance Hayes Gloss Sharpness reflectivity Real name CR Example 1 94.9 9.9 87 368.5 3.2 65.5 Example 2 93.5 9.3 100 320 3.7 62.0 Comparative example 93.6 8.9 100 220 4.2 60.0

As shown in Table 1, Example 1 and Example 2, although the reflectance was lower than the comparative example, the image sharpness, the clear real CR value was higher. This means that the anti-glare effect is excellent, but side effects such as contrast reduction do not occur.

Claims (15)

Transparent substrate layer; And
And an anti-glare layer including a binder resin and a filler having a lower refractive index than the transparent base layer.
The refractive index difference between the transparent substrate layer and the anti-glare layer is within the range of 0.02 ~ 1.0,
The binder resin may be a sol-gel reactant using a silane compound and a fluorine-based alkylsilane; Or a mixture of a polyfunctional acrylate monomer and a fluorine acrylate. The anti-glare film of claim 1 wherein the reflectance is 4% or less. The anti-glare layer of claim 1, wherein the transparent substrate layer is selected from the group consisting of triacetyl cellulose (TAC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC) and norbornene-based polymers. film. delete delete delete An anti-glare composition comprising a binder resin and a filler having a lower refractive index than the transparent base layer,
The difference in refractive index between the anti-glare layer and the transparent substrate layer formed by curing the binder resin is within the range of 0.02 ~ 1.0,
The binder resin may be a sol-gel reactant using a silane compound and a fluorine-based alkylsilane; Or a mixture of a multifunctional acrylate monomer and a fluorine acrylate. delete delete The anti-glare composition according to claim 7, wherein the binder resin having a lower refractive index than the transparent base layer is 5 to 70 parts by weight based on 100 parts by weight of the antiglare composition. The anti-glare composition according to claim 7, wherein the filler is 30 parts by weight or less based on 100 parts by weight of the anti-glare composition. The anti-glare composition of claim 7 further comprising a solvent. The method of claim 12, wherein the solvent is methyl ethyl ketone, toluene, C1 to C6 lower alcohols, acetates, ketones, cellosolves, dimethylformamide, tetrahydrofuran, propylene glycol monomethyl ether, toluene, and xylene Anti-glare composition selected from the group consisting of. The anti-glare composition of claim 7, wherein the anti-glare composition further comprises a photocuring initiator and an additive. Display device comprising the anti-glare film of any one of claims 1 to 3.