KR101271469B1 - Protecting oxidation film for touch screen panel and touch screen panel having the same - Google Patents

Abstract

The present invention relates to an anti-oxidation film for a touch screen panel and a touch screen panel employing the same.
In the touch screen panel structure, the anti-oxidation film of the present invention may be sequentially arranged such that a film protective adhesive layer, a base sheet layer, and a hard coating layer disposed to be adhered to the transparent conductive layer in a direction opposite to the display unit face the liquid crystal display unit. In this case, the anti-reflection portion having a structure in which a high refractive index layer and a low refractive index layer are further stacked on the lower surface of the hard coating layer may reduce the reflectance of light that is diffused from the outside and increase the transmittance of light emitted from the liquid crystal display device. Finally, high transmittance images can be realized. In addition, the interlayer adhesion is firmly adhered by the film protective adhesive layer formed on the back surface of the base sheet layer, thereby protecting the transparent conductive layer. In addition, moisture may penetrate into the inside of the touch screen panel by minute air circulation of the air layer by the film protective adhesive layer, thereby preventing a phenomenon in which the external appearance and the electrical properties of the touch screen panel are deteriorated.

Description

Anti-oxidation film for touch screen panel and touch screen panel employing it {PROTECTING OXIDATION FILM FOR TOUCH SCREEN PANEL AND TOUCH SCREEN PANEL HAVING THE SAME}

The present invention relates to an anti-oxidation film for a touch screen panel and a touch screen panel employing the same, and more particularly, in the touch screen panel configuration, an anti-reflection portion further including a high refractive index layer and a low refractive index layer stacked below the hard coat layer. By reducing the reflectance of light diffused from the outside by reflecting, while increasing the transmittance of the light emitted from the liquid crystal display device for an anti-oxidation film for a touch screen panel and a touch screen panel having the same to realize a high transmittance image will be.

The touch screen panel is a panel that does not use an input device such as a keyboard or a mouse, and detects the position of a person's hand or an object on a screen or a specific position to process a specific function. Touch screens to which touch screen panels are applied are widely used in mobile terminals such as mobile phones and navigation because they are portable and easy to operate.

The touch screen panel basically consists of a touch screen panel, a controller, a driver SW, and the like. The touch screen panel consists of a top plate (Film) and a bottom plate (Film or Glass) on which Indium Tin Oxide (ITO) is deposited, and determines the presence or absence of contact input, detects input coordinates, and transmits signals to the controller. In charge of. The controller converts the signal transmitted from the touch screen panel into a digital signal and outputs the coordinates on the display.The driver SW is a program that receives the digital signal from the controller and implements the touch screen panel for each operating system. .

Touch screen panels are classified into resistive, capacitive, surface accoustic wave (SAW), and infrared (infrared) methods depending on the implementation method. Capacitive systems having excellent characteristics are in the spotlight.

3 is a schematic cross-sectional view of a conventional capacitive touch screen panel. As shown in FIG. 3, the touch screen panel unit 200 is positioned on the liquid crystal display unit 70, and an adhesive layer is disposed around the touch screen panel unit 200 and the liquid crystal display unit 70. 50c is provided. The touch screen panel 200 includes a substrate 60, an upper adhesive layer 50b is disposed on a bottom surface of the substrate 60, and an upper transparent conductive layer 40b is disposed on a bottom surface of the upper adhesive layer 50b. ) Is installed, and the upper transparent conductive layer 40b may be formed of indium-tin oxide. A bottom adhesive layer 50a is disposed on a bottom surface of the upper transparent conductive layer 40b, a bottom transparent conductive layer 40a is provided on a bottom surface of the bottom adhesive layer 50a, and a bottom surface of the bottom transparent conductive layer 40a is provided. Is equipped with an antioxidant film.

The anti-oxidation film includes a hard coat layer 11 on one side of the base sheet layer 20 and a film protective adhesive layer 30 on the other side, and the anti-oxidation film is scratched by the lower transparent conductive layer 40a. It protects it from being damaged by the tongue and prevents the phenomenon that the moisture penetrates into the inside of the touch screen panel by minute air circulation and the like, thereby deteriorating the appearance and electrical characteristics of the touch screen panel.

The liquid crystal display unit 70 generates electric field effects by twisting liquid crystal molecules by controlling electric field driving, controls transmission and blocking of the light source, and transmits the color filter to display images or characters. The user may operate and input the touch panel by touching a place corresponding to the position of the image or character displayed on the upper portion 90 of the touch screen panel unit 200 on the glass substrate 60.

However, when the light source generated in the above-described liquid crystal display unit 70 passes through the touch screen panel unit 200, the air layer is formed as large as the height of the adhesive layer 50c formed between the liquid crystal display unit 70. The pores are formed, and after passing through the pores, they pass through the hard coat layer 11 of the first antioxidant film. However, due to the high difference in refractive index between the air layer (refractive index: 1) and the surface of the hard coat layer present in the voids, the surface reflectance is increased in the transmitted light source, which causes a disadvantage in that the transmittance of the image displayed on the final glass substrate 60 is reduced. It is pointed out that the problem should be improved for high-permeability image implementation.

An object of the present invention is to provide an antioxidant film for a touch screen panel.

Another object of the present invention is to provide a touch screen panel employing the film for the touch screen panel.

In order to achieve the above object, the present invention is adhered to the transparent conductive layer formed on the lower surface of the touch screen panel, the anti-oxidation for the touch screen panel laminated film protective adhesive layer, the base sheet layer and the hard coat layer sequentially from the top In the film, there is provided an anti-reflection film for a touch screen panel, characterized in that the anti-reflection portion made of a structure in which a high refractive index layer and a low refractive layer are laminated below the hard coat layer.

At this time, the refractive index (n) and the thickness (d) in the low refractive layer satisfies the following equation (1).

Equation 1

n-d = λ / 4

(In the above, lambda is the wavelength range of visible light, and 500nm≤λ≤650nm.)

It is preferable that the relationship (B / A) of the refractive index (B) of the low refractive layer (B) to the refractive index (A) of the high refractive layer is 0.6 to 0.95, and the refractive index (B) of the low refractive layer is 1.38 to 1.48.

In addition, the high refractive layer is characterized in that the thickness of 0.03 to 0.13㎛, the low refractive layer has a thickness of 0.05 to 0.12㎛. At this time, the low refractive layer has a peel force of 500gf / inch or more, characterized in that having a contact angle of less than 85 °. The low refractive index layer contains hollow and porous silica fine particles in a hard acrylate polymer resin.

The minimum reflectance of the antioxidant film of the present invention has 1.5% or less.

In addition, the film protective adhesive layer is made of acrylic, natural rubber, synthetic rubber, ethylene-vinyl acetate copolymerization system, ethylene-acrylic acid ester system, styrene-isoprene block copolymer, styrene-butadiene block copolymerization system, polyurethane system and polyester system It consists of a pressure-sensitive adhesive of a single or two or more mixed components selected from the group, characterized in that the glass transition temperature (Tg) of the film protective adhesive layer is -100 ℃ to 0 ℃.

Furthermore, the present invention provides a touch screen panel including at least one glass and at least one transparent conductive layer on the antioxidant film.

Anti-oxidation film according to the present invention, in the touch screen panel structure, the film protective adhesive layer, the base sheet layer disposed to be attached to the transparent conductive layer in a direction facing the display unit; And an anti-reflection portion having a structure in which a high refractive index layer and a low refractive index layer are further stacked on a lower surface of the hard coating layer when the hard coating layers are sequentially arranged to face the liquid crystal display device, thereby reflecting light diffused from outside and diffusely reflected. While reducing, the transmittance of the light emitted from the liquid crystal display may be increased to finally achieve a high transmittance image. In the anti-oxidation film according to the present invention, a film protective adhesive layer is provided on the back surface of the base sheet layer, thereby firmly attaching the lower transparent conductive layer and protecting the lower transparent conductive layer. In addition, moisture may penetrate into the inside of the touch screen panel due to minute air circulation of the air layer by the film protective adhesive layer, thereby preventing the appearance of the touch screen panel from being degraded and electrical properties.

Furthermore, the present invention can provide a touch screen panel of a full capacity type employing an antioxidant film having the above characteristics.

1 is a schematic cross-sectional view of an antioxidant film for a touch screen panel of the present invention,
2 is a schematic cross-sectional view of a capacitive touch screen panel employing the anti-oxidation film 100 of the present invention.
3 is a schematic cross-sectional view of a conventional capacitive touch screen panel.

The present invention provides an anti-oxidation film (100) for a touch screen panel in which an anti-reflection portion is formed to increase the transmittance of light emitted from the liquid crystal display device while reducing the reflectance of light diffused from outside.

1 is a schematic cross-sectional view of an anti-oxidation film 100 for a touch screen panel of the present invention, Figure 2 is a schematic cross-sectional view of a capacitive touch screen panel 200 employing the antioxidant film 100. 3 is a schematic cross-sectional view of a conventional capacitive touch screen panel.

Referring to Figures 1 and 2 which is a preferred embodiment of the present invention compared to Figure 3, the antioxidant film 100 of the present invention is formed on the lower surface of the touch screen panel in a direction opposite to the display unit 90 In the anti-oxidation film for a touch screen panel which is adhered to the transparent conductive layer, and the film protective adhesive layer 30, the base sheet layer 20 and the hard coat layer 11 are sequentially laminated from the top, the hard coat layer ( 11) The anti-reflection portion 10 formed of a structure in which the high refractive index layer 12 and the low refractive layer 13 is stacked below is further formed.

In addition, it provides a touch screen panel 200 employing the antioxidant film 100 of the present invention.

In the antioxidant film 100 of the present invention, the refractive index n and the thickness d in the low refractive index layer 13 satisfy the following Equation 1.

Equation 1

n-d = λ / 4

(In the above, lambda is the wavelength range of visible light, and 500nm≤λ≤650nm.)

It is preferable that the relationship (B / A) of the refractive index B of the low refractive layer 13 to the refractive index A of the high refractive layer 12 is 0.6 to 0.95. At this time, the refractive index B of the low refractive index layer 13 is 1.47 or less, More preferably, it is 1.38-1.48.

Hereinafter, the layer-specific features of the antioxidant film 100 of the present invention shown in FIG. 1 will be described in detail.

1) Base sheet layer 20

In the antioxidant film 100 of the present invention, the base sheet layer 20 preferably has a high light transmittance and a low haze value for use in a display device. For example, the light transmittance at a wavelength of 400 to 800 nm is preferably 40% or more, more preferably 60% or more, and the haze value is 5% or less, more preferably 3% or less. If the above conditions are not satisfied, there is a tendency that the sharpness of the image is lacking when used as a display member.

The material used for the base sheet layer 20 of the present invention may be used without particular limitation among the resin materials used in the known plastic base sheet layer, but preferably ester, ethylene, propylene, diacetate, triacetate, styrene And polymers or copolymerized polymers having one selected from carbonate, methyl pentene, sulfone, ether ethyl ketone, imide, fluorine, nylon, acrylate, alicyclic olefin, and the like as a structural unit.

More preferably, among these resins excellent in transparency, strength, and thickness uniformity, one selected from an ester system such as polyethylene terephthalate, an acetate system such as triacetyl cellulose, and an acrylate system such as polymethyl methacrylate is used. It is to use a polymer or copolymerized polymer. In particular, a polymer having an ester system as a structural unit is used in terms of transparency, haze value, and mechanical properties.

Preferred examples of the polyester resin include polyethylene terephthalate, polyethylene-2,6-naphthalate, polybutylene terephthalate, polyethylene-a, β-bis (2-chlorophenoxy) ethane-4,4'- Dicarboxylates and the like. In addition, 20 mol% or less of other dicarboxylic acid components or diol components can be copolymerized with these polyesters. Among them, polyethylene terephthalate is most preferred in terms of quality and economy. It is also preferable that the above-mentioned resin component uses together 1 type (s) or 2 or more types.

Although the thickness of the base material sheet layer 20 is not specifically limited, From a viewpoint of transparency, a haze value, and a mechanical characteristic, it is 5-800 micrometers, More preferably, it is 10-250 micrometers. Moreover, two or more films can also be bonded together by a well-known method.

The base sheet layer 20 has various surface treatments, for example, corona discharge treatment, glow discharge treatment, flame treatment, and etching treatment, before forming the anti-reflection portion 10 and the film protective adhesive layer 30 formed on one surface thereof. Or roughening treatment can be performed. Further, in order to promote adhesion, a primer layer, for example, polyurethane, polyester, polyester acrylate, polyurethane acrylate, polyepoxy acrylate or titanate based on the surface of the base sheet layer 10 After coating the compound, a high refractive index hard coating layer may be formed. In particular, when primer-coated a composition composed of a copolymer and a crosslinking agent grafted an acrylic compound to a hydrophilic group-containing polyester resin, the adhesion is improved, and the durability such as heat resistance, water resistance and the like is excellent. It is preferable as a material.

2) Anti-reflection part (10)

1 and 2, an anti-reflection portion 10 having a hard coating layer 11, a high refractive index layer 12, and a low refractive index layer 13 formed on one surface of the base sheet layer 20 is formed. The stacks are arranged in the order opposite to the liquid crystal display device 70.

As the anti-oxidation film 100 of the present invention includes the anti-reflection portion 10, while reducing the reflectance of light that is diffused from the outside and diffusely reflected, the transmittance of the light emitted from the liquid crystal display device is finally increased, thereby achieving high transmittance. You can implement an image of.

It is essential that the hard coat layer 11 contains a (meth) acrylate compound, and the (meth) acrylate compound is radically polymerized by actinic radiation and improves the solvent resistance or hardness of the formed film.

As a (meth) acrylate compound, Preferably methyl (meth) acrylate, n-butyl (meth) acrylate, polyester (meth) acrylate, lauryl (meth) acrylate, hydroxyethyl (meth) acrylate And monofunctional acrylate compounds such as hydroxypropyl (meth) acrylate can be used. Moreover, More preferably, when using the polyfunctional (meth) acrylate compound whose (meth) acryloyl group is two or more in a molecule | numerator, solvent resistance improves further.

At this time, preferable examples of the polyfunctional (meth) acrylate are pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol tetra (meth) acrylic One kind or a mixture of two or more kinds selected from elate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and trimetholpropane tri (meth) acrylate can be used.

The hard coat layer 11 of the present invention contains an alkyl silicate and its hydrolyzate, inorganic particles such as colloidal silica, dry silica, wet silica, titanium oxide, silica fine particles dispersed in colloidal form, and the like, in the resin component, The hardness of the hard coat layer can be improved.

The thickness of the hard coat layer 11 may vary depending on the application, but is preferably 1 to 50 μm, more preferably 2 to 30 μm. At this time, if the thickness of the hard coat layer 11 is less than 1 µm, the surface hardness is insufficient to easily cause scratches. If the thickness of the hard coat layer 11 exceeds 50 µm, the transparency is lowered, the haze value is easily increased, the cured film is weakened, and the film is folded. When bent, cracks tend to occur in the hard coat layer 11.

In the anti-reflection portion 10 of the present invention, the high refractive layer 12 is made of conductive particles and a binder resin component. In the above, the conductive particles means metal fine particles or metal oxide fine particles, and among them, the metal oxide fine particles are more preferable because of their high transparency.

As such metal oxide fine particles, tin-containing antimony oxide particles (ATO), zinc-containing antimony oxide particles, tin-containing indium oxide particles (ITO), zinc oxide / aluminum oxide particles, antimony oxide particles and the like can be used, more preferably. For example, tin-containing indium oxide particles (ITO) and tin-containing antimony oxide particles (ATO).

As for the said electroconductive particle, what has an average primary particle diameter (sphere equivalent diameter measured by BET method) is 0.5 micrometer or less, Preferably it is 0.001-0.3 micrometer, More preferably, it is 0.005-0.2 micrometer. . If the conductive particle diameter range is exceeded, the transparency of the resulting film is lowered, and if it is less than the particle size range, particles tend to aggregate and the haze value of the resulting film is increased, so that the desired haze value cannot be obtained in either case.

As the binder component constituting the high refractive layer 12, a (meth) acrylate compound may be used, and the (meth) acrylate compound is radically polymerized by actinic radiation and improves the solvent resistance or hardness of the formed film. More preferably, it is a polyfunctional (meth) acrylate compound in which a (meth) acryloyl group is two or more in a molecule | numerator, As an example, a pentaerythritol tri (meth) acrylate, a trimetholpropane tri (meth) acrylate, Trifunctional (meth) acrylates, such as glycerol tri (meth) acrylate, ethylene modified trimetholpropane tri (meth) acrylate, and tris- (2-hydroxyethyl) -isocyanuric ester tri (meth) acrylate And tetrafunctional or higher (meth) acrylates such as pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate and dipentaerythritol hexa (meth) acrylate can be used.

In order to improve the dispersibility of particle | grains, the binder component which comprises the high refractive layer 12 can use the (meth) acrylate compound which has acidic functional groups, such as a carboxyl group, a phosphoric acid group, and a sulfonic acid group. Specifically, the acidic functional group-containing monomer is an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, crotonic acid, 2-methacryloyloxyethyl succinic acid, 2-methacryloyloxyethyl phthalic acid, mono (2- (meth Phosphoric acid (meth) acrylic acid ester, 2-sulfoester (meth) acrylate, such as) acryloyloxyethyl) acid phosphate and diphenyl-2- (meth) acryloyloxyethyl phosphate, etc. can be used.

In addition, the (meth) acrylate compound which has polar bonds, such as an amide bond, a urethane bond, and an ether bond, can also be used.

More preferably, a resin having a urethane bond, such as a urethane (meth) acrylate oligomer, which has high polarity and can improve dispersibility of particles, is used.

The high refractive index layer 12 of this invention may contain various additives, such as a polymerization inhibitor, a hardening catalyst, antioxidant, a dispersing agent, a leveling agent, and a silane coupling agent, as needed.

In the present invention, a conductive polymer such as polypyrrole and polyaniline, and an organometallic compound such as a metal alcoholate and a chelate compound may be further contained in the components of the high refractive layer 12 for the purpose of imparting conductivity.

Further, the components of the high refractive layer 12 may further contain alkyl silicates and hydrolyzates thereof, colloidal silica, dry silica, wet silica, inorganic particles such as titanium oxide, silica fine particles dispersed in colloidal form, and the like. In this case, surface hardness can be improved.

The anti-reflection portion 10 of the present invention includes a low refractive index layer 13, thereby reducing the difference in refractive index with air when the light emitted from the liquid crystal display device first passes through the low refractive index layer 13 to reduce the surface reflection of the light. Reduce and increase the final transmittance.

In addition, by reducing the surface roughness to reduce the surface diffuse reflection, it is possible to prevent the deterioration of turbidity, in order to meet this requirement, the low refractive layer is prepared in the form of silica particles contained in the acrylate resin.

At this time, the acrylate resin should be able to improve the solvent resistance and hardness of the low refractive index layer 13 formed by radical polymerization by actinic radiation. Preferred acrylate resins for meeting these requirements include methyl (meth) acrylate, n-butyl (meth) acrylate, polyester (meth) acrylate, lauryl (meth) acrylate, hydroxyethyl (meth). Monofunctional acrylates, such as a) acrylate and hydroxypropyl (meth) acrylate; Pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipenta It is to use a single or a mixture of two or more selected from polyfunctional acrylates such as pentaerythritol hexa (meth) acrylate and trimethylolpropane tri (meth) acrylate. More preferably, polyfunctional acrylate is used, in which case solvent resistance and the like are improved.

In addition, the silica fine particles use hollow and porous microparticles to reduce the difference in refractive index with air, and in order to reduce surface roughness, the average particle size is limited to several tens of nm.

The silica fine particle component may be dry silica, wet silica, silica fine particles dispersed in a colloidal phase, and the like, and more preferably, fine silica particles dispersed in a colloidal phase.

Particle diameters of the silica fine particles may be generally those having an average primary particle size (spherical diameter: BET method) of 1 to 200nm, but preferably particles having a particle size of 40 to 80nm, two or more particles having a different average particle diameter It can also be mixed and used. At this time, when the range of the said average particle diameter is satisfied, the transparency of a production film (resin layer) does not fall, and surface hardness can be improved.

In addition, the shape of the silica fine particles is preferably spherical or columnar.

The silica fine particles may be subjected to physical surface treatment such as plasma discharge treatment or corona discharge treatment and chemical surface treatment using a coupling agent, and more preferably to use chemical surface treatment.

When the antireflective portion 10 in which the hard coat layer 11, the high refractive layer 12, and the low refractive layer 13 are sequentially stacked is formed, an initiator may be used to advance curing of the applied binder component. The initiator may be used as long as it is a known photopolymerization initiator. Preferable examples include sulfides such as sodium methyldithiocarbamate sulfide, diphenyl monosulfide, dibenzothiazoyl monosulfide and disulfide; Thioxanthone derivatives such as thioxanthone, 2-ethyl thioxanthone, 2-chlorothioxanthone and 2,4-diethyl thioxanthone; Azo compounds such as hydrazone and azobisisobutyronitrile; Diazo compounds such as benzenediazonium salts benzoin, benzoin methyl ether, benzoin ethyl ether, benzophenone, dimethylaminobenzophenone, myhilerketone, benzyl anthraquinone, t-butyl anthraquinone, 2-methyl anthraquinone Aromatic carbonyl compounds such as 2-ethylanthraquinone, 2-aminoanthraquinone and 2-chloroanthraquinone; dialkylamino benzoic acid esters such as methyl p-dimethylamino benzoate, ethyl p-dimethylamino benzoate, butyl D-dimethylamino benzoate and isopropyl p-diethylamino benzoate; Peroxides such as benzoyl peroxide, di-t-butyl peroxide, dicumyl peroxide and cumene hydroperoxide; Acridine derivatives such as 9-phenylacridine, 9-p-methoxyphenylacridine, 9-acetylaminoacridine and benzacridin; Phenazine derivatives such as 9,10-dimethylbenzphenazine, 9-methylbenzphenazine, and 10-methoxybenzphenazine; Quinoxaline derivatives such as 6,4 ', 4 "-trimethoxy-2,3-diphenylquinoxaline 2,4,5-triphenylimidazoyl dimer, 2-nitrofluorene, 2,4,6 -Triphenylpyrilium tetrafluoroborate, 2,4,6-tris (trichloromethyl) -1,3,5-triazine, 3,3'-carbonylbiscoumarin, thiomihilerketone, 2 , 4,6-trimethylbenzoyldiphenylphosphineoxide, oligo (2-hydroxy-2-methyl-1- (4- (1-methylvinyl) phenyl) propanone, 2-benzyl-2-dimethylamino-1 -(4-morpholinophenyl) -butanone etc. are mentioned.

In addition, when forming the hard coat layer 11 and the high refractive index layer 12 in the present invention, in order to prevent sensitivity degradation due to oxygen degradation of the initiator, the photopolymerization initiator may further include an amine compound. In this case, the amine compound is a nonvolatile compound such as an aliphatic amine compound or an aromatic amine compound, and preferably triethanolamine and methyldiethanolamine are used.

When forming the antireflection portion 10 of the present invention, in order to reduce the surface reflection of light incident on the low refractive index layer 13, the product of the refractive index (n) and the thickness (d) of the low refractive index layer 13 is the object It is preferable to make it 1/4 of the wavelength of a light ray (usually visible light).

Therefore, in the low refractive layer 13, it is preferable that four times the product of the thickness d and the refractive index n of each layer is in the range of 380 to 780 nm. That is, the relationship between the refractive index n and the thickness d in the low refractive index layer 13 is calculated by Equation 1 below.

Equation 1

n-d = λ / 4

(Here,? Is the wavelength range of visible light, and becomes 500 nm ≦ λ ≦ 650 nm.)

In order to impart low reflectivity to the antioxidant film 10 of the present invention, the thickness of the high refractive layer 12 is 0.03 to 0.13 µm, and the thickness range of the low refractive layer 13 is preferably 0.05 to 0.12 µm. At this time, outside the thickness of the low refractive index layer 13 presented above, the requirements of Equation 1 cannot be satisfied, and low reflectivity is not imparted to the low refractive layer 13 side surface.

In addition, in order to impart low reflectivity to the surface of the low refractive layer 13 side of the present invention, the refractive index B of the low refractive layer 13 must be smaller than the refractive index A of the high refractive layer 12, and the low refractive layer The relationship between the (13) / high refractive layer 12 (B / A) is preferably less than 1.0, more preferably 0.6 to 0.95. At this time, the refractive index B of the low refractive index layer 13 is 1.47 or less, More preferably, it is 1.38-1.48. At this time, if the refractive index (B) of the low refractive index layer 13 is less than 1.38, it is practically impossible to form the low refractive index layer 13, and if the refractive index (B) of the low refractive index layer 13 exceeds the refractive index of 1.48, the reflectance may be Increases.

3) Film protective adhesive layer (30)

The film protective adhesive layer 30 is formed on the back surface of the base sheet layer 20, and the adhesive used for the adhesive layer 30 is an upper transparent conductive layer adhered on the film protective adhesive layer 30 (Fig. It can be used without particular limitation, as long as grass remains on the bottom surface of 40a) of 2, and it has a property which is free of contamination and can be removably adhered.

The pressure-sensitive adhesive used in the film protective adhesive layer 30 is acrylic, natural rubber, synthetic rubber, ethylene-vinyl acetate copolymer, ethylene-acrylic acid ester, styrene-isoprene block copolymer, styrene-butadiene block copolymer, polyurethane And various pressure-sensitive adhesives such as polyesters.

More preferably, the acrylic adhesive which has high transparency and expresses favorable adhesiveness with an optical sheet is used. At this time, as a preferable acrylic adhesive, the (meth) acrylic-type polymer containing 50-100 weight% of (meth) acrylates having a C1-C14 alkyl group as a monomer component is used as a main polymer component.

In this case, the (meth) acrylic polymer may be used as long as it is a (meth) acrylic polymer having adhesiveness, and more preferably may be used alone or in combination of two or more of (meth) acrylates having an alkyl group having 1 to 14 carbon atoms. At this time, the (meth) acrylic polymer is to use 50 to 100% by weight, more preferably 60 to 99.5% by weight of the total monomer components.

More specific examples include methyl (meth) acrylate, ethyl (meth) acrylate, n -butyl (meth) acrylate, s- butyl (meth) acrylate, t- butyl (meth) acrylate and isobutyl (meth ) Acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n -octyl (meth) acrylate, isooctyl (meth) acrylate, n -nonyl (meth) acrylate, isononyl ( Meth) acrylate, n- decyl (meth) acrylate, isodecyl (meth) acrylate, n-dodecyl (meth) acrylate, n -tridecyl (meth) acrylate, n-tetradecyl (meth) acrylic The rate etc. are mentioned.

In addition, in this invention, in addition to the (meth) acrylate which has a C1-C14 alkyl group mentioned above, for adjusting the glass transition point and peelability of the functional group containing monomer which can react with a crosslinking agent, or a (meth) acrylic-type polymer, Other polymerizable monomer components can be used.

As an example of the said functional group containing monomer, the functional group which functions as a crosslinking origin of a carboxyl group containing monomer, an acid anhydride group containing monomer, a hydroxyl group containing monomer, an amino group containing monomer, an epoxy group containing monomer, an isocyanate group containing monomer, an aziridine group containing monomer, etc. It is to use the component having appropriately.

Moreover, as a main polymer component, it is preferable that the glass transition temperature (Tg) of the said (meth) acrylic-type polymer is -100 degreeC-0 degreeC normally, and it is more preferable that it is -80 degreeC --10 degreeC. In addition, the glass transition temperature (Tg) of a (meth) acrylic-type polymer can be adjusted in the said range by changing suitably the monomer component to be used and these composition ratios.

Furthermore, the present invention provides a touch screen panel employing the antioxidant film.

More specifically, at least one glass and at least one transparent conductive layer are attached onto the antioxidant film 100 to complete the touch screen panel.

2 illustrates a touch screen panel 200 employing the anti-oxidation film 100 of the present invention. The capacitive touch screen panel 200 of the present invention includes a substrate 60, and the substrate An upper adhesive layer 50b is formed on a lower surface, an upper transparent conductive layer 40b is formed on a lower surface of the upper adhesive layer 50b, and a lower adhesive layer (b) is formed on a bottom surface of the upper transparent conductive layer 40b. 50a), a lower transparent conductive layer 40a is formed on the bottom surface of the lower adhesive layer 50a, and an anti-oxidation film 100 of the present invention is formed on the bottom surface of the lower transparent conductive layer 40a. The capacitive touch screen panel 200 is installed by installing the adhesive layer 50c around the bottom surface of the anti-oxidation film 100 for the touch screen pattern and installing the display unit 70 on the bottom surface of the adhesive layer 50c. Is completed.

At this time, a detailed description of the antioxidant film 100 is the same as mentioned above.

Accordingly, the capacitive touch screen panel 200 employing the anti-oxidation film 100 of the present invention is provided by the anti-reflective unit 10 while reducing the reflectance of light diffused from the outside and exiting from the liquid crystal display device. Increasing the transmittance of light can finally achieve a high transmittance image. In addition, the interlayer adhesion is firmly adhered by the film protective adhesive layer formed on the back surface of the base sheet layer 20 to protect the transparent conductive layer. In addition, moisture may penetrate into the inside of the touch screen panel due to minute air circulation of the air layer by the film protective adhesive layer, thereby preventing the appearance of the touch screen panel from being degraded and electrical properties.

In addition, at least one metal conductor 80 is connected to an edge of the upper transparent conductive layer 40b and the lower transparent conductive layer 40a, and a potential is applied to the upper transparent conductive layer 40b and the lower transparent conductive layer 40a by applying a voltage. Value can be formed.

The transparent conductive layer may further include one or more transparent conductive layers in addition to the upper transparent conductive layer 40b and the lower transparent conductive layer 40a.

In detail, the upper transparent conductive layer 40b and the lower transparent conductive layer 40a have a structure in which a conductive layer is stacked on a substrate, and glass or poly ethylene terephthalate (PET) may be used as the substrate. The conductive layer may be ITO or a conductive polymer.

Meanwhile, a gap is formed between the display unit 70 and the adhesive layer 50c by the height of the adhesive layer, and the void is filled with air.

The touch screen panel 200 of the present invention displays an image and a text on the display unit 70, and on the transparent conductive layers 40a and 40b when the user touches the upper display unit 70 with a finger or other conductive object. Since the potential is formed, the position where the upper transparent conductive layer 40b is touched detects a finger or other conductive object to generate a capacitive effect, and further, detects a signal of a change amount of a current value, and detects the corresponding signal. The metal wire 80 may be transmitted to an external microprocessor (not shown), and then the touched position may be calculated based on the change amount of the current value, and thus the purpose of the touch control may be achieved.

Hereinafter, the present invention will be described in more detail with reference to Examples. This embodiment is intended to illustrate the present invention in more detail, and the scope of the present invention is not limited to these examples.

Example 1 Preparation of Antioxidant Film 1

1. Formation of the antireflection portion 10

1) Formation of Hard Coat Layer 11

Using a microgravure coater on the surface of the base sheet layer made of a polyester film (KZ7528, manufactured by JSR, KZ7528) having a thickness of 50 μm, containing a polyfunctional acrylic resin After apply | coating and drying for 2 minutes at 80 degreeC, ultraviolet-ray 200mJ / cm <^2> was irradiated, the coating layer was hardened | cured, and the hard-coat layer 11 of thickness about 3 micrometers was formed.

2) Formation of High Refractive Layer 12

The coating liquid obtained by dissolving a coating material containing tin indium oxide particles (ITO) (10% solids) (manufactured by Nippon Kayaku Co., Ltd., HRA-196) in isopropyl alcohol and stirring the mixture was prepared on the surface of the hard coat layer. After application using a microgravure coater and drying at 80 ° C. for 2 minutes, ultraviolet ray 200mJ / cm 2 was irradiated to cure the coating layer to form a high refractive index layer 12 having a thickness of about 0.1 μm and a refractive index (n) = 1.62. .

3) Formation of Low Refractive Layer 13

100 parts by weight of hollow silica (catalytic, THRULYA4110, average particle diameter: 60 nm) was mixed with 100 parts by weight of a paint (50% solids) (manufactured by JSR, KZ7528) containing a polyfunctional acrylic resin, and the mixture was 3% by weight. After dissolving in methyl ethyl ketone to make a solution, the coating solution obtained by stirring was applied on a high refractive layer using a microgravure coater, dried at 80 ° C. for 2 minutes, and then irradiated with ultraviolet light 200 mJ / cm 2 under nitrogen atmosphere to cure the coating layer. The low refractive index layer 13 of thickness 0.1mm and refractive index n = 1.42 was formed.

2. Formation of film protective adhesive layer 30

Pressure-sensitive adhesive composition (gel fraction: 95%) comprising an acrylic copolymer resin (weight average molecular weight: 1,270,000, molecular weight distribution: 5.5, glass transition temperature: -37 ° C) containing 1.3% of isocyanate-based curing agent (Cosmotech, NA-1045L) After the coating on the polypropylene release film substrate, the anti-reflection portion 10 formed on one surface of the base sheet layer 20 is formed, the thickness of 25㎛ on the back surface of the base sheet layer 20 The adhesive was transfer-laminated and aged to form a film protective adhesive layer.

Example 2 Preparation of Antioxidant Film 2

In Example 1, a hollow silica (catalyst) compared to 100 parts by weight of the solid content in the paint (solid content 50%) (JSR Co., KZ7528) containing a polyfunctional acrylic resin in the step of forming the low refractive index layer 13 of the antireflection layer 130 parts by weight of Hwaseong, THRULYA4110, and an average particle diameter of 60 nm) were mixed, the mixture was dissolved in methyl ethyl ketone such that the mixture became a 3% by weight solution, and then agitated with a microgravure coater. After drying at 80 ° C. for 2 minutes, ultraviolet ray 200mJ / cm 2 was irradiated under a nitrogen atmosphere to cure the coating layer, except that a low refractive layer having a thickness of about 0.1 μm and a refractive index (n) = 1.40 was formed. In the same manner as in Example 1 to prepare an antioxidant film (100).
Comparative Example 1
In Example 1, the hard coat layer and the high refractive index layer of the anti-reflection layer was formed in the same way, and the fluorine additive (Daikin, OPTOOL DAC-HP) to the low refractive layer additionally mixed 5 parts by weight based on 100 parts by weight of solids Except that, it was carried out in the same manner as in Example 1 to form an antireflection layer and an adhesive layer.
Comparative Example 2
In Example 1, a hard coat layer and an adhesive layer are formed in the same manner as in Example 1 except that the high refractive layer and the low refractive layer are omitted and only the hard coat layer 11 is formed. It was.
Comparative Example 3
In Example 1, the antireflection layer was formed in the same manner, and the formation of the adhesive layer was excluded.

Experimental Example 1 Property Evaluation

For Examples 1 to 2 and Comparative Examples 1 to 3, the peel force, the transmittance and the haze, the minimum reflectance, the water contact angle, and the scratch resistance were measured, and the results are shown in Table 1.

1. Peeling force measurement

NITTO TAPE (No. 500) was laminated on the surfaces of the antioxidant films and hard coat films prepared in Examples 1 to 2 and Comparative Examples 1 to 3 at a pressure of 2 kgf / cm and left for 60 minutes. Thereafter, the sample was peeled at a peel angle of 180 ° and a peel rate of 300 mm / min, and the stress was measured.

2. Transmittance and haze measurement

The transmittance and haze of the anti-oxidation film and the hard coat film for the touch screen panel prepared in the above Examples and Comparative Examples were measured using a spectrophotometer (model of Nippon Denshoku, NDH2000).

3. Minimum reflectance measurement

The antioxidant films and the hard coat films prepared in Examples and Comparative Examples were measured using a spectrophotometer UV3600 manufactured by Shimadzu Corporation. The sample film is made of 320-400 water-resistant sandpaper, which is uniformly wound on the back surface and coated with black paint to completely eliminate the reflection from the back surface, and measures the light at an incident light angle of 6 to 10 degrees with respect to the resin layer side surface. Was performed. In addition, the minimum reflectance here shows the minimum value in wavelength range 380nm = (lambda) = 780nm.

4. Water contact angle measurement

The antioxidant film and the hard coat film prepared in Examples and Comparative Examples were added dropwise purified water having a diameter of 2mm on the surface using a contact angle meter (Kyowa Co., Drop Master 300 model) and the contact angle between the surface and purified water was measured. .

5. Scratch resistance measurement

When there are no wounds by observing the number of wounds when the antioxidant film and the hard coat film prepared in the above Examples and Comparative Examples were reciprocated ten times by applying a load of 250 gf / cm ² using steel wool (steel wool) Level 5, if there are 1 to 5 wounds Level 4, if there are 5 to 10 wounds Level 3, if there are more than 10 wounds, level 2, if there is a wound on the entire surface was classified as level 1.

Referring to Table 1, in Examples 1 and 2 including an antireflective part including a hard coat layer, a high refractive index layer, and a low refractive layer on one surface of the base sheet layer, a minimum reflectance of 1.5% or less and substantially 0.2% or less It was confirmed. From the above results, it can be seen that while reducing the reflectance of light diffused from the outside and increasing the transmittance of the light emitted from the liquid crystal display device, a high transmittance image can be finally realized. In addition, the low refractive index layer 13 included in the anti-reflection portion 10 exhibits a peel force of up to 692 gf / inch, thereby easily adhering to neighboring adhesive layers, and a film protective adhesive layer on the back surface of the base sheet layer. 30 is included to serve to firmly attach the transparent conductive layer and the antioxidant film 100 and at the same time it is possible to protect the lower transparent conductive layer.

On the other hand, in Comparative Example 1 in which the low refractive index layer 13 contains a fluorine additive for lowering the surface energy, the peeling force is significantly lowered, so that adhesion with neighboring adhesive layers is not easy. In addition, in the antireflection portion 10, which is a feature of the anti-oxidation film of the present invention, the minimum reflectance of the comparative example 2 composed of only the hard coat layer 11 without the formation of the high refractive index layer 12 and the low refractive index layer 13 is remarkably. It is not easy to implement high transmittance image because of high.

On the other hand, in Comparative Example 3, which does not include the film protective adhesive layer 30 which is another feature of the antioxidant film of the present invention, adhesion of the adjacent transparent conductive layer to the conductive film was impossible. From the above, the anti-reflective portion 10 formed of the hard coat layer 11, the high refractive index layer 12, the low refractive index layer 13 on one surface of the base sheet layer 20 according to the present invention and the film protection formed on the rear surface An antioxidant film including the adhesive layer 30 satisfies physical properties suitable for application of a touch screen panel.

Anti-oxidation film according to the present invention, in the touch screen panel structure, the film protective adhesive layer, the base sheet layer disposed to be attached to the transparent conductive layer in a direction facing the display unit; And an anti-reflection portion having a structure in which a high refractive index layer and a low refractive index layer are further stacked on a lower surface of the hard coating layer when the hard coating layers are sequentially arranged to face the liquid crystal display device, thereby reflecting light diffused from outside and diffusely reflected. While reducing, the transmittance of the light emitted from the liquid crystal display may be increased to finally achieve a high transmittance image. In the anti-oxidation film according to the present invention, a film protective adhesive layer is provided on the back surface of the base sheet layer, thereby firmly attaching the lower transparent conductive layer and protecting the lower transparent conductive layer. In addition, moisture may penetrate into the inside of the touch screen panel due to minute air circulation of the air layer by the film protective adhesive layer, thereby preventing the appearance of the touch screen panel from being degraded and electrical properties.

Furthermore, the present invention can provide a touch screen panel of a full capacity type employing an antioxidant film having the above characteristics.

10: antireflection portion 11: hard coat layer
12: high refractive layer 13: low refractive layer
20: base sheet layer 30: film protective adhesive layer
40a, 40b: transparent conductive layer 50a, 50b, 50c: adhesive layer
60 substrate 70 liquid crystal display device
80: metal wire 90: display unit
100: antioxidant film 200: touch screen panel

Claims (13)

In the anti-oxidation film for a touch screen panel which is adhered to the transparent conductive layer formed on the lower surface of the touch screen panel, the film protective adhesive layer, the base sheet layer and the hard coat layer sequentially stacked from the top,
A high refractive layer made of conductive particles and a binder resin component under the hard coat layer; And an antireflection portion having a structure in which a low refractive layer containing hollow and porous silica fine particles is laminated on a hard acrylate polymer resin,
Refractive index (n) and thickness (d) of the low refractive index layer is an antioxidant film for a touch screen panel, characterized in that
Equation 1
n-d = λ / 4
Is the wavelength range of visible light, and 500 nm≤λ≤650 nm. delete The antioxidant film for a touch screen panel according to claim 1, wherein the relationship (B / A) of the refractive index (B) of the low refractive index layer to the refractive index (A) of the high refractive index layer is 0.6 to 0.95. The anti-oxidation film of claim 3, wherein the low refractive index layer B has a refractive index of 1.38 to 1.48. The anti-oxidation film of claim 1, wherein the high refractive index layer has a thickness of 0.03 to 0.13 μm. The anti-oxidation film of claim 1, wherein the low refractive index layer has a thickness of 0.05 to 0.12 μm. The anti-oxidation film of claim 1, wherein the low refractive index layer has a peel force of 500 gf / inch or more. The anti-oxidation film of claim 1, wherein the low refractive index layer has a contact angle of 85 ° or less. The antioxidant film for a touch screen panel according to claim 1, wherein a minimum reflectance of the antioxidant film is 1.5% or less. delete The film protective adhesive layer according to claim 1, wherein the film protective adhesive layer is acrylic, natural rubber, synthetic rubber, ethylene-vinyl acetate copolymer, ethylene-acrylic acid ester, styrene-isoprene block copolymer, styrene-butadiene block copolymer, polyurethane and The antioxidant film for a touch screen panel, characterized in that the pressure-sensitive adhesive of a single or two or more mixed components selected from the group consisting of polyester. The antioxidant film for a touch screen panel according to claim 11, wherein the glass transition temperature (Tg) of the film protective adhesive layer is -100 ° C to 0 ° C. A touch screen panel comprising at least one glass and at least one transparent conductive layer on the antioxidant film of claim 1.

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