KR100659578B1 - Method for manufacturing antistatic hard-coated brightness enhancement optical device and antistatic hard-coated brightness enhancement optical device using thereof - Google Patents

Abstract

Provided are a method for preparing an antistatic hard coating brightness improving optical device, and an antistatic hard coating optical device prepared by the method which is prevented in the breakage of liquid crystal due to the adhesion of impurities and is improved in scratch resistance. The method comprises the steps of spin coating a solution comprising 100 parts by weight of an antistatic hard coating composition comprising 0.5-30 wt% of an antistatic agent, 0.1-15 wt% of a curing agent, 0.1-3 wt% of a leveling agent and 0.1-15 wt% of a UV absorber and 20-110 parts by weight of a dispersant on a brightness improving film of an optical device under the condition of a rotation velocity of 10-5,000 rpm and a rotation time of 1-500 sec; drying an antistatic hard coating layer by rotating with 20-5,000 rpm at 15-85 deg.C; and curing it with UV rays of 5-40 mL and a rotation velocity of 10-3,000 rpm.

Description

Method for manufacturing antistatic hard coating brightness enhancement optical device and antistatic hard coating brightness enhancement optical device using same {Method for Manufacturing Antistatic Hard-Coated Brightness enhancement Optical Device and Antistatic Hard-Coated Brightness enhancement Optical Device using

1 is a block diagram of a hard coating brightness enhancing optical element to which a conventional antistatic hard coating transparent support is attached,

2 is a configuration diagram of an antistatic hard coating luminance improvement optical device according to a temporary embodiment of the present invention;

3 is a graph showing the transmittance of an antistatic hard coating luminance improving optical device obtained in Example 1;

4 is a graph showing the transmittance of the antistatic hard coating luminance improving optical element obtained in Example 2;

5 is a graph showing the transmittance of the luminance improving optical element obtained in Comparative Example 1;

6 is a graph showing the transmittance of the luminance improving optical element obtained in Comparative Example 2. FIG.

Explanation of symbols on the main parts of the drawings

100: antistatic hard coating layer 200: brightness enhancement film

300, 500: adhesive 400: polarizing film

600: liquid crystal cell

The present invention relates to a method for manufacturing an antistatic hard coating luminance improving optical element and an antistatic hard coating luminance improving optical element using the same. In particular, an anti-thinning property of an ultra-thin film is applied to a luminance improving optical element by a spin-coating method. Manufacturing method of antistatic hard coating brightness improving optical device which can prevent foreign matter from adhering to static electricity by forming hard coating layer, and can produce ultra thin film brightness improving optical device with excellent scratch resistance and charging The present invention relates to an optical element for preventing hard coating luminance improvement.

In liquid crystal displays and the like, an image forming system necessarily requires polarizing elements disposed on both sides of a liquid crystal cell, and generally, a polarizing plate is attached thereto. In addition, in the liquid crystal panel, in order to improve the display quality of the display device, various optical elements other than the polarizing plate are increasingly used. For example, a retardation plate for preventing coloring, a viewing-angle expansion film for improving the viewing angle of the liquid crystal display, a brightness enhancing film for increasing the contrast of the display, and the like are used. These films are collectively called an optical film.

When attaching an optical film to a liquid crystal cell, an adhesive is generally used. In addition, in the adhesion between the optical film and the liquid crystal cell, and the optical film, it is generally attached using an adhesive to reduce the loss of light.

In these optical films, a surface protective film is generally attached on that surface to prevent the occurrence of damage and contamination to the surface of the optical film in the transportation or manufacturing process until the optical film is delivered to consumers. The surface protection film is attached from the step in which the optical film is in the state of a single material, and in some cases is peeled off after being attached to an LCD or the like, and in other cases it is attached to the same or another surface protection film after peeling off. There was a problem that static electricity generated in the case of peeling of the surface protection film may destroy a circuit such as an LCD panel.

In addition, since the liquid crystal display device does not have its own light emitting source, a light source must be installed externally, and a backlight assembly is used for this purpose. In order to improve the brightness of this backlight, a brightness enhancement film is used. For example, a dual brightness enhancement film (DBEF) is mainly used.

However, the luminance-enhanced film as described above has a problem in that the surface resistance is high, the static electricity is generated, and foreign matters are easily attached to the surface, and the liquid crystal is broken by external charge in a large liquid crystal display (LCD). In addition, there is a problem that the surface hardness is low, the scratch resistance is poor, and transparency is damaged by scratches or scrapes.

In addition, in the case of forming an antistatic hard coating layer in order to solve the above problems, a conventional adhesive was used. 1 is a configuration diagram of an optical element having an antistatic hard coating transparent support attached to a product in which a polarizing film with a liquid crystal cell and a brightness enhancing film are laminated. As shown, the upper surface of the polarizing film 5 is attached to the crystal cell 7 by the pressure-sensitive adhesive (6), the lower surface is attached to the brightness enhancement film (3) by the pressure-sensitive adhesive (4), the brightness enhancement film The adhesive 2 is apply | coated to (3), and the antistatic hard coating transparent support body 1 is attached on it.

However, the brightness improving optical device having improved antistatic function and surface hardness manufactured by the conventional manufacturing method as described above has a problem that its thickness is thick due to the thickness of the adhesive and the antistatic hard coating transparent support, and using an adhesive separately. There is a problem in that the cost for the pressure-sensitive adhesive is carried out to perform the step, thereby the process is complicated.

Accordingly, the present invention has been proposed to solve the above conventional problems, and an object of the present invention is to form an ultra-thin antistatic hard coating layer on the brightness improving optical device to prevent foreign matters from being attached by static electricity. And a method of manufacturing an antistatic hard coating brightness improving optical element capable of manufacturing an ultrathin thin film having improved scratch resistance and having sufficient hardness that does not impair transparency due to friction or the like, and using the same An anti-static hard coating luminance improvement optical device is provided.

Hereinafter, the present invention will be described in detail with reference to the technical spirit.

Antistatic hard coating luminance improvement optical device manufacturing method according to the present invention is a spin coating step of coating an antistatic hard coating layer by spin-coating (spin-coating) the luminance enhancement optical element cut to a predetermined size, coated charging A drying step of drying the anti-hard coating layer and a curing step of photocuring the dry antistatic hard coating layer. Look below.

In the present specification, the "enhanced brightness film" refers to a film that improves luminance and is composed of a single film, and the "enhanced brightness optical element" refers to a form in which the luminance enhanced film is attached to a polarizing film and a liquid crystal cell.

(1) Spin coating step

In the method of manufacturing an antistatic hard coating luminance improving optical device according to the present invention, spin coating is applied to remove the conventional transparent support layer and to make the antistatic hard coating layer thinner.

In the present invention, without applying a direct spin coating method to the brightness enhancement film, it is formed by spin coating an antistatic hard coating layer on the brightness enhancement film combined with a polarizing film or antistatic properties on the polarizing film attached to the liquid crystal cell (cell) The hard coat layer is formed by spin coating.

The rotation speed and rotation time applied in the spin coating method of the present invention are as follows.

In the present invention, it is preferable to coat a solution obtained by mixing the antistatic hard coat layer composition with the dispersant at a rotational speed of 10 rpm to 5,000 rpm, and more preferably 100 rpm to 4,000 rpm. Even more preferred spin coating speeds range from 500 rpm to 3,000 rpm.

If the rotational speed of the spin coating is less than 10 rpm, the desired predetermined thin film may not be obtained and the antistatic hard coating layer may not be evenly applied to the surface of the optical element of improving brightness. In addition, when greater than 5,000rpm, due to the high centrifugal force, the thickness difference occurs in the center and the outer portion of the antistatic hard coating layer. In addition, in order to maintain a high rotational speed can be difficult to spin coating apparatus and may affect the durability of the brightness enhancement optical element itself.

In addition, in the spin coating step of the present invention, the rotation time is preferably 1 second to 500 seconds, more preferably 3 seconds to 400 seconds. Even more preferably, it is 10 to 300 seconds. The rotation time may vary depending on the viscosity of the solution in which the antistatic hard coating layer composition and the dispersant are mixed and the thickness of the antistatic hard coating layer to be coated.

If the rotation time is less than 1 second, it is difficult to ensure sufficient time to evenly apply the antistatic hard coating layer to the luminance improving optical element, and if it is more than 500 seconds, the economic efficiency is poor.

Looking at the composition of the antistatic hard coating layer composition consisting of a curable resin, an antistatic agent, a curing agent, a leveling agent, a UV absorber containing a urethane acrylate used in the present invention and a dispersant mixed with the composition are as follows.

① Curable resin

The curable resin used in the present invention uses a photocurable resin for ultraviolet curing.

Photocurable resins generally use known resins. As the photocurable resin, unsaturated polyester resins, polyfunctional acrylate resins, urethane acrylates, epoxy acrylic resins, epoxy acrylate resins and the like can be used alone or in combination.

The curable resin used in the present invention is preferably 60% to 95% by weight, more preferably 70% to 90% by weight in 100% by weight of the antistatic hard coating layer composition. When the curable resin is less than 60% by weight in 100% by weight of the antistatic hard coating layer composition, it is difficult to obtain high hardness due to curing, and when the curable resin is greater than 95% by weight, the content of the curing agent and leveling agent is relatively small, and thus the desired physical properties. Hard to get.

If the curable resin usable in the present invention exhibits the same effect, the range or content is not limited to the listed resins or contents, of course.

The curable resin used in the present invention more preferably uses an ultraviolet curable polyfunctional acrylate resin in order to obtain properties such as high hardness and transparency. The ultraviolet curable polyfunctional acrylate-based resin used in the present invention may be dipentaerythritol hexaacrylte, tetramethylolmethane tetraacrylate, tetramethylolmethane triacrylate. , Trimethylolpropane triacrylate, 1,6-hexanediol diacrylate, 1,6-bis (3-acryloyloxy-2-hydroxypropyloxy) hexane Polyfunctional alcohol derivatives such as [1,6-bis (3-acryloyloxy-2-hydroxypropyl) hexane], urethanes such as polyethylene glycol diacrylate and pentaerythritol triacrylate Acrylate, hexamethylene diisocyanate urethane prepolymer, etc. Or mixed.

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

If the UV-curable polyfunctional acrylate-based resin is less than 10% by weight in 100% by weight of the curable resin, it is difficult to obtain high hardness due to the combination of functional groups because the absolute number of functional groups is small. There is a disadvantage of weak chemical.

② Antistatic Agent

The antistatic agent used in the present invention may be used alone or in combination with a conductive polymer, metal particles, inorganic oxides, metal oxides and the like.

The conductive polymer used as an antistatic agent in the present invention is polyacetylene, poly (p-phenylene) [poly (p-phenylene)], polythiophene, poly (3,4-ethylenedioxythiophene ) [Poly (3,4-ethylenedioxythiophene) (PEDOT)], Polypyrrole [Polypyrrole (pyridine polymer)], Poly (p-phenylene sulfide) [Poly (p-phenylene sulfide)], Poly (p-phenylene vinylene ) [Poly (p-phenylene vinylene)], poly (thienylene vinylene), polyaniline (Polyaniline) and the like can be used alone or in combination.

Metal particles used as antistatic agents in the present invention are silver (Ag), gold (Au), copper (Cu), aluminum (Al), platinum (Pt), nickel (Ni), chromium (Cr), lead (Pb) , Cobalt (Co), rhodium (Rh), ruthenium (Ru), tin (Sn), iridium (Ir), palladium (Pd), titanium (Ti) and the like alone, mixed or silver (Ag) coated copper (Cu Coated with other metals like).

In the present invention, the inorganic oxide to be used refers to all oxides except organic oxides as inorganic oxides. In the present invention, it is preferable to use a metal oxide among the inorganic oxides.

Metals forming metal oxides are not limited and include sodium (Na), magnesium (Mg), potassium (K), calcium (Ca), scandium (Sc), titanium (Ti), vanadium (V), chromium (Cr), Manganese (Mn), Cobalt (Co), Iron (Fe), Copper (Cu), Zinc (Zn), Gallium (Ga), Aluminum (Al), Nickel (Ni), Copper (Cu), Rubidium (Rb), Yttrium (Y), lanthanum (La), strontium (Sr), zirconium (Zr), niobium (Nb), molybdenum (Mo) and the like can be used. These metals may form several metal oxides with one metal having a plurality of valences. It is also possible to form a multimetal oxide containing two or more metals.

In the present invention, typically, indium tin oxide (ITO), antinomy tin oxide (ATO), SiO ₂ , TiO ₂ , Al ₂ O ₃ , B ₂ O ₃ , CaO, SnO, MgO, SrO, ZnO, ZrO ₂ , Y ₂ Metal oxides such as O ₃ and La ₂ O ₃ may be used alone or in combination.

The particle diameter of the metal oxide is preferably 0.05 µm to 1 µm, more preferably 0.1 µm to 0.5 µm. If the particle diameter of the metal oxide is smaller than 0.05 μm, it is difficult to obtain an antistatic effect due to satisfactory light diffusion, and the light diffusivity is lowered, so that the image is discolored to aluminum color. In addition, when the particle diameter of the metal oxide is larger than 1 µm, the thickness of the antistatic hard coating layer is increased, the background of the screen to be applied is rough, and the image contrast is deteriorated.

The content of the antistatic agent is preferably 0.5% to 30% by weight, and more preferably 3% to 20% by weight, based on 100% by weight of the antistatic hard coating layer coating layer composition. Even more preferably 7% to 15% by weight. If the content of the antistatic agent is less than 0.5% by weight, it is difficult to secure the conductivity, and when the content of the antistatic agent is greater than 30% by weight, the conductive effect is remarkable but mass productivity and economic efficiency may be deteriorated.

③ curing agent

The curing agent of the present invention may be appropriately selected or mixed according to the form of the functional group present in the photocurable resin, preferably isocyanate compound, epoxy compound, aziridine compound, metal chelate compound, metal alkoxide metal salt, An amine compound, a hydrazine compound, etc. are used individually or in mixture.

Isocyanate compounds in the present invention are trimethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, diphenylmethane isocyanate, xylene diisocyanate aromatic diisocyanate compounds such as diisocyanate, aliphatic diisocyanate such as hexamethyl diisocyanate, and the like are used alone or in combination.

In addition, the epoxy compound in the present invention is a polyethylene glycol diglycidyl ether (diglycidyl ether), diglycidyl ether (diglycidyl ether), trimethylol propane triglycidyl ether (trimethylol propane triglycidyl ether) and the like alone Or mixed.

It is preferable to use 0.1 to 15 weight% of 100% by weight of the hardening | curing agent in an antistatic hard coating layer composition, More preferably, it is 0.5 to 10 weight%. Even more preferably 1% to 5% by weight.

In the present invention, the curing agent is an additive used to control the molecular weight or the chain structure of the antistatic hard coating layer composition. When the curing agent is used in the above-described range, the effect of suppressing phase separation and the like is prominent. If the content of the curing agent is less than 0.1% by weight, it is difficult to expect the function of the curing agent, and when the content of the curing agent is greater than 15% by weight, the content of the curable resin is relatively low, making it difficult to increase the hardness.

④ Leveling agent

In the present invention, to level the surface of the antistatic hard coating layer, a leveling agent is used in the hard coating composition. The leveling agent can be used by mixing a ketone or an ester solvent with a silicone resin. As a leveling agent by this invention, it is preferable to use a silicone diacrylate and a silicone polyacrylate compound individually or in mixture.

The content of the leveling agent is preferably 0.1% to 3% by weight, more preferably 0.5% to 2% by weight, based on 100% by weight of the antistatic hard coating layer composition. If the leveling agent is less than 0.1% by weight, it is difficult to expect the leveling effect, and when greater than 3% by weight, the hardness may be weakened.

⑤ UV absorber

In the present invention, when using the photocurable resin for the ultraviolet curing, it is preferable to use a ultraviolet absorber to prevent deterioration generated during photocuring and to improve the durability of the antistatic hard coating layer.

The ultraviolet absorber used in the present invention is preferably used alone or mixed with a salicylate ultraviolet absorber, a benzophenone ultraviolet absorber, a benzotriazole ultraviolet absorber, a cyanoacrylate ultraviolet absorber, and a benzoate ultraviolet absorber. Do.

More specifically, the ultraviolet absorber is phenyl salicylate, p-tert-butylphenyl salicylate, p-octylphenyl salicylate, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy- 4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, bis (2-methoxy-4 -Hydroxy-5-benzoylphenyl) methane, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-5'-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-di-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-3'-tert-butyl-5'-methylphenyl) -5- Chlorobenzotriazole, 2- (2'-hydroxy-3 ', 5'-di-tert-butylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3', 5-di -tert-amylphenyl) benzotriazole, 2- (2'-hydroxy-4'-octoxy Yl) benzotriazole, 2- (2'-hydroxy-3 '-(3', 4 ', 5', 6'-tetrahydrophthalimidomethyl) -5'-methylphenyl) benzotriazole, 2,2 '-Methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazolyl-2-yl) phenol], 2- (2'-hydroxy-5'-meta Krilloxyphenyl) -2H-benzotriazole, 2,2'-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6-[(2H-benzotriazol-2-yl) phenol ], And 2- (2'-hydroxy-3 ', 5'-di-t-amylphenyl) benzotriazole, 2-ethylhexyl-2-cyano-3,3'-diphenylacrylate, ethyl 2-cyano-3,3'-diphenyl acrylate or the like is used alone or in combination.

In the present invention, the content of the ultraviolet absorber is preferably used in an amount of 0.1 wt% to 15 wt%, more preferably 0.5 wt% to 10 wt%, in 100 wt% of the antistatic hard coating layer composition. Even more preferably 1% to 5% by weight.

When the content of the ultraviolet absorber is 0.1% by weight or less, the effect of adding the ultraviolet absorber may not be properly realized, and when the content of the ultraviolet absorber is 15% by weight or more, the physical properties of the antistatic hard coating layer may be affected.

⑥ Dispersant

In the present invention, an organic solvent that is a dispersant is used to apply the antistatic hard coating layer to the brightness enhancing optical device. In the present invention, it is preferable to use an organic solvent in which the antistatic hard coating layer composition can be evenly dispersed.

The organic solvent is selected in consideration of the coating property of the antistatic hard coating layer, the adhesion with the optical element to improve the brightness, and the enhancement of the surface hardness enhancement function.

The organic solvent used in the present invention is a C1-8 saturated hydrocarbon alcohol such as methanol, isopropanol, butanol, t-butanol, isobutanol and the like, acetone, methyl ethyl ketone, methyl isobutyl ketone and the like of ketones. Saturated hydrocarbon-based diketones having 1 to 8 carbon atoms, such as 1 to 8 saturated hydrocarbon ketones and acetyl acetone, ethyl acetate of esters, ethyl hydrocarbons of 1 to 8 carbon atoms such as butyl acetate, and ethyl alcohols of ether alcohols. Solves, methyl cellosolves, butyl cellosolves, 1-methoxy-2-propanol, and N-methyl pyrrolidone, ethyl cellosolve acetate, diacetone alcohol, and the like are used alone or in combination. Moreover, benzene, toluene, xylene, ethylbenzene, etc. which correspond to an aromatic hydrocarbon can also be used individually or in mixture.

The organic solvent is preferably used in an amount of 20 parts by weight to 110 parts by weight, and more preferably 30 parts by weight to 80 parts by weight, based on 100 parts by weight of the antistatic hard coating layer composition to be applied. When the content of the organic solvent is less than 20 parts by weight with respect to 100 parts by weight of the antistatic hard coating layer composition, the viscosity is low, so that the coating property, adhesion, etc. with the brightness enhancing optical element are deteriorated. It is inferior in profitability by using too much organic solvent compared with a coating layer composition.

The thickness of the antistatic hard coat layer according to the present invention is preferably 2 µm to 20 µm, more preferably 4 µm to 15 µm. Even more preferred is 5 μm to 10 μm. When the thickness of the hard coating layer is less than 2㎛ the thickness is too thin, it is difficult to secure scratch resistance and antistatic function, when larger than 20㎛ has a disadvantage in economy of spin coating.

(2) drying step

In the drying step, a step of drying the optical device coated with the antistatic hard coating layer uniformly in the step (1). That is, in the drying step, the solvent applied in the spin coating step (1) is volatilized.

In the drying step, not only the solvent remaining in the antistatic hard coating layer can be more effectively removed by performing the drying process by the rotating process, but the solution mixed with the antistatic hard coating layer composition and the dispersant is the polarizing film and the luminance. The improved film is more easily adsorbed onto the laminated luminance-enhanced optical element surface, thereby completing the drying step in a short time.

The drying temperature performed in the drying step is preferably 15 ℃ to 85 ℃, more preferably 25 ℃ to 75 ℃. If the drying temperature is lower than 15 ℃ it takes a long time to remove the solvent, if the drying temperature is higher than 85 ℃ may affect the properties of the antistatic hard coating layer.

The rotational speed performed in the drying step is preferably to dry the solvent at 20rpm to 5,000rpm, more preferably 50rpm to 4,000rpm. Even more preferred rotational speeds are from 70 rpm to 3,000 rpm.

If the rotational speed of the drying step is less than 20rpm, it is difficult to sufficiently obtain the drying effect by the rotation, if the rotational speed of more than 5,000rpm drying efficiency is lower than the rotational speed.

Moreover, as for drying time, about 15 second-about 300 second are preferable. More preferably 55 to 200 seconds, still more preferably 60 to 100 seconds. If the drying time is less than 15 seconds, the effect of drying does not appear properly, and drying for more than 300 seconds may affect the physical properties.

(3) curing step

In the curing step, the antistatic hard coating layer formed through the spin coating step and the drying step is cured.

Photocuring in the present invention proceeds to UV curing, UV curing is preferably UV curing in the energy range of 5mJ to 40mJ, more preferably 10mJ to 20mJ.

When the amount of UV curing energy is less than 5mJ, sufficient photocuring effect may not be obtained, and when the amount of UV curing energy is greater than 40mJ, excessive UV curing may affect the properties of the antistatic hard coating layer.

In the curing step of the present invention, as in the spin coating step or the drying step, the curing step may be performed through a spin process. Rotational speed carried out in the curing step is preferably cured at 10rpm to 3,000rpm, more preferably 50rpm to 2,000rpm. Even more preferred rotational speeds are from 70 rpm to 1,000 rpm.

If the rotational speed of the curing step is less than 10rpm, it is difficult to obtain the effect by the rotation sufficiently, if the rotational speed is greater than 3,000rpm hardening efficiency compared to the rotational speed.

As such, the present invention performs one continuous spin process in the coating step, the drying step, and the curing step, so that the antistatic hard coating layer composition applied to the luminance-enhanced optical element surface can be effectively applied evenly by centrifugal force. In addition, the drying step and the curing step can be dried and cured more effectively.

Through the spin process, it is possible to form an ultra thin film, which is one of the technical features of the present invention. Since the durability of the brightness enhancement film is weak, the spin process cannot be performed while rotating the brightness enhancement film itself, and the spin process is performed while rotating the brightness enhancement optical element to which the brightness enhancement film is coupled.

Based on this technical configuration, the antistatic hard coating luminance-enhancing optical device according to the present invention may form various coating layers of several nm to several μm. In the present invention, it is possible to implement a thinner antistatic hard coating luminance improving optical device by increasing the rotation speed.

Figure 2 shows the configuration of the antistatic hard coating brightness enhancement optical device according to an embodiment of the present invention, because the antistatic hard coating transparent support and the adhesive of Figure 1 can be implemented to be thinner than the thickness have.

The protection scope of the present invention is, of course, inferior to the antistatic hard coating luminance improving optical device manufacturing method according to the present invention as well as the antistatic hard coating brightness improving optical device made through this. In addition, the antistatic hard coating luminance improvement luminance optical device according to the present invention is a cathode ray tube (CRT), a liquid crystal display (LCD), a plasma display (PDP, plasma display panel) and organic Applicable to at least one of the group consisting of an organic light emitting diode (OLED).

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

Example 1

After manufacturing a polarizing film by a conventional method, after laminating 3M's 'DBEF' to 90 ㅀ and then cut into 500mm horizontally and vertically, 10% by weight of polyacetylene, 3% by weight of a curing agent, 1 weight of a leveling agent %, UV absorber 3% by weight and the rest of the antistatic hard coating layer composition comprising a UV-curable multi-functional acrylate-based resin in xylene to prepare a solution in the form of a solution, and then the solution at 1000rpm DBEF side Coating was performed for 20 seconds at rotation speed. And after performing a drying step for 1 minute at a rotational speed of 1,000rpm at 70 ℃, by photocuring with ultraviolet light of 15mJ at a rotational speed of 1,000rpm to prepare a thickness of the antistatic hard coating layer to 5㎛. The weight part of xylene was mixed in the ratio of 70 weight part with respect to 100 weight part of antistatic hard coat layer compositions.

Example 2

It was manufactured under the same conditions as in Example 1 except that the thickness of the hard coat layer was 10 μm at a rotational speed of 500 rpm.

Comparative Example 1

The polarizing film manufactured by the conventional method and the film which laminated | stacked 3M DBEF which is a brightness improving film were used without hard-coating.

Comparative Example 2

As shown in FIG. 1, a luminance-enhanced optical element having a hard coated transparent support was used.

[Table 1] shows the results of measuring the adhesion, pencil diameter, degree of wear resistance, transmittance and thickness of the optical element, which are physical properties of the luminance-enhanced optical element obtained in Examples and Comparative Examples.

division Adhesion Surface resistance (Ω / sq) Pencil hardness Wear resistance Overall film thickness (μm) Transmittance Example 1 100/100 1.69 * e04 2H ○ 292 1.17 Example 2 100/100 4.81 * e04 2H ○ 297 1.06 Comparative Example 1 - 3.0 * e11 6B X 287 1.25 Comparative Example 2 - 2.9 * e11 2H ○ 357 1.23

The adhesion, pencil hardness, and wear resistance measured in [Table 1] were measured by the following method.

(Adhesiveness)

The surface of the antistatic hard coating layer of the luminance improving optical element (the luminance improving film in Comparative Example 1 and the transparent support body hard-coated in Comparative Example 2) was put with 100 cross hatchings of 1 mm㎜1 mm by a cutter, and the cellophane adhesive was applied. After the tape was attached, the hard coating counted the number of eyes remaining on the film substrate when the cellophane adhesive tape was removed.

(Pencil hardness)

The pencil hardness of the surface of the antistatic hard coating layer of the luminance improving optical element (the luminance improving film in Comparative Example 1 and the transparent support body hard coated in Comparative Example 2) was measured using a conventional pencil scratch tester.

(Wear resistance)

The antistatic hard coating layer (the brightness improving film in Comparative Example 1, the hard support transparent coating in Comparative Example 2) was rubbed with a steel surface, and the scratches were visually observed.

Observation results were measured as follows.

○: no scratch

×: scratches

As shown in Table 1, the thickness of the antistatic hard coating luminance improving optical element coated by the spin coating method is higher than that of the luminance improving optical element (Comparative Example 2) coated with the hard coating layer on the transparent support. A thin luminance improvement optical element can be realized. In addition, when looking at the pencil hardness, Example 1, Example 2, Comparative Example 2 shows the same pencil hardness (2H) because the hard coating process, but Comparative Example 1 is not hard coating process, the hardness is low (6B) Able to know.

In addition, the transmittances of the luminance-enhanced optical elements obtained in Examples 1, 2, Comparative Example 1, and Comparative Example 2, as shown in Table 1, have a slight difference. This means that even if the antistatic hard coating layer is coated on the DBEF, since there is no difference in transmittance, it can be used for the same purpose. 3 to 6 show transmittance graphs according to wavelengths of the luminance-enhanced optical elements obtained in Examples 1, 2, Comparative Example 1, and Comparative Example 2. FIG. It can be seen from the graphs above that the transmittances of Example 1, Example 2, Comparative Example 1 and Comparative Example 2 for wavelengths between 400 nm and 700 nm are almost the same.

Table 2 shows the color values of the Examples and Comparative Examples.

Item L a b Example 1 11.83 13.71 -17.61 Example 2 11.27 13.76 -18.28 Comparative Example 1 11.21 13.39 -18.66 Comparative Example 2 11.11 13.12 -18.17

L, a, and b represent color coordinates. As shown in [Table 2], it can be seen that the color coordinates of the color values in the examples and the comparative examples have obtained similar results. This means that the light transmitted through the luminance improving optical elements obtained in Examples 1, 2, Comparative Example 1, and Comparative Example 2 exhibited almost the same color. Therefore, even if the antistatic hard coating layer is formed on the surface of the DBEF by spin coating, it means that the color is not affected.

In the above, this invention was demonstrated in detail with reference to an Example and a comparative example centering on a structure. However, the scope of the present invention is not limited to the above embodiments but may be embodied in various forms of embodiments within the appended claims. Without departing from the gist of the invention as claimed in the claims, any person of ordinary skill in the art is deemed to be within the scope of the claims underlying the present invention to the extent possible for various modifications.

In addition, the preferred range, more preferred range, and even more preferred range limitation in the present invention is to maximize the effect even more, it is possible to obtain a more satisfactory technical effect by narrowing the limited range.

As described above, the method of manufacturing an antistatic hard coating luminance improving optical element according to the present invention and the antistatic hard coating luminance improving optical element using the same are formed by using a spin coating method to form an antistatic hard coating layer, As a result, foreign matters may be attached to prevent the liquid crystal from being broken, and the surface hardness may be increased to improve scratch resistance.

In addition, by forming an antistatic hard coating layer by using a direct spin coating method on the brightness enhancement film, there is an effect that can produce a thin film brightness enhancement optical element.

Claims (13)

(a) 100% by weight of an antistatic hard coating layer composition comprising a curable resin, an antistatic agent, a curing agent, a leveling agent, and an ultraviolet absorber under rotating conditions of a rotational speed of 10 rpm to 5000 rpm and a rotation time of 1 second to 500 seconds. , The curing agent using a photocurable resin, Iii) 0.5 wt% to 30 wt% of the antistatic agent Ii) 0.1% to 15% by weight of the curing agent Iii) 0.1% to 3% by weight of the leveling agent Iv) the ultraviolet absorber is mixed with a dispersant and the antistatic hard coating layer composition comprising 0.1% to 15% by weight of the solution on the brightness enhancement film of the brightness enhancement film and the brightness enhancement optical film is laminated Coating an antistatic hard coating layer, but the content of the dispersant is a spin coating step of coating by mixing in a ratio of 20 parts by weight to 110 parts by weight with respect to 100 parts by weight of the antistatic hard coating layer composition; (b) a drying step of drying the antistatic hard coating layer by rotating the temperature at 15 ° C. to 85 ° C., and rotating the speed at 20 rpm to 5000 rpm; And (c) UV-curing the antistatic hard coating layer at 5mJ to 40mJ, and during curing, the rotational speed is a manufacturing method of an antistatic hard coating brightness improving optical device, characterized in that it comprises a curing step of 10rpm to 3,000rpm. . The method of claim 1, In the step (a), the antistatic agent is a method of manufacturing an antistatic hard coating luminance improvement optical element, characterized in that at least one of a conductive polymer, metal particles, inorganic oxides are mixed. The method of claim 2, The conductive polymer is polyacetylene, poly (p-phenylene) [Poly (p-phenylene)], polythiophene, poly (3,4-ethylenedioxythiophene) [Poly (3,4 -ethylenedioxythiophene) (PEDOT)], polypyrrole [pyridine polymer], poly (p-phenylene sulfide) [poly (p-phenylene sulfide)], poly (p-phenylene vinylene) [Poly (p-phenylene vinylene)], poly (thienylene vinylene), and polyaniline (Polyaniline) at least one of the antistatic hard coating brightness improving optical device manufacturing method. The method of claim 2, The metal particles are silver (Ag), gold (Au), copper (Cu), aluminum (Al), platinum (Pt), nickel (Ni), chromium (Cr), lead (Pb), cobalt (Co), rhodium (Rh), ruthenium (Ru), tin (Sn), iridium (Ir), palladium (Pd), titanium (Ti) at least one of the manufacturing method of the antistatic hard coating brightness enhancement optical element. The method of claim 2, The inorganic oxide is a metal oxide, but ITO, ATO, SiO ₂ , TiO ₂ , Al ₂ O ₃ , B ₂ O ₃ , CaO, SnO, MgO, SrO, ZnO, ZrO ₂ , Y ₂ O ₃ , La ₂ O _A method of manufacturing an antistatic hard coating luminance improving optical element, characterized in that at least one of _three is used. The method of claim 5, The metal compound has a particle diameter of 0.05㎛ to 1㎛ characterized in that the antistatic hard coating brightness improving optical device manufacturing method. The method of claim 1, The antistatic hard coating layer is a thickness of 2㎛ to 20㎛ manufacturing method of manufacturing an antistatic hard coating brightness improvement optical element, characterized in that. The method of claim 1, The dispersing agent is a saturated hydrocarbon alcohol having 1 to 8 carbon atoms, such as methanol, isopropanol, butanol, t-butanol, isobutanol, and a saturated carbon alcohol having 1 to 8 carbon atoms such as acetone, methyl ethyl ketone, and methyl isobutyl ketone. Saturated hydrocarbon-based diketones having 1 to 8 carbon atoms, such as hydrocarbon ketones and acetyl acetone, saturated hydrocarbon-based esters having 1 to 8 carbon atoms, such as ethyl acetate and butyl acetate of esters, ethyl cellosolves of ether alcohols, and methylcello Solv, butyl cellosolve, 1-methoxy-2-propanol, in addition to N-methyl pyrrolidone, ethyl cellosolve acetate, diacetone alcohol, benzene, toluene, xylene, ethylbenzene A method of manufacturing an antistatic hard coating brightness improving optical element. The method of claim 1, The curable resin is a method of manufacturing an antistatic hard coating brightness-enhancing optical element, characterized in that the ultraviolet curable polyfunctional acrylate-based resin using 10% to 90% by weight in 100% by weight of the curable resin. The method of claim 9, The ultraviolet curable polyfunctional acrylate-based resin is dipentaerythritol hexaacrylte, tetramethylolmethane tetraacrylate, tetramethylolmethane triacrylate, trimethanol propane triacrylate Trimethylolpropane triacrylate, 1,6-hexanediol diacrylate, 1,6-bis (3-acryloyloxy-2-hydroxypropyloxy) hexane [1,6- bis (3-acryloyloxy-2-hydroxypropyl) hexane], polyethylene glycol diacrylate, pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer (hexamethylene diisocyanate urethane prepolymer) Method for manufacturing an antistatic hard coating brightness improving optical element, characterized in that at least one . The method of claim 1, In step (a), the ultraviolet absorber is phenyl salicylate, p-tert-butylphenyl salicylate, p-octylphenyl salicylate, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzo Phenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydrate Hydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, bis (2-methoxy 4-hydroxy-5-benzoylphenyl) methane, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-5'-tert-butylphenyl) benzotria Sol, 2- (2'-hydroxy-3 ', 5'-di-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-3'-tert-butyl-5'-methylphenyl)- 5-chlorobenzotriazole, 2- (2'-hydroxy-3 ', 5'-di-tert-butylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3', 5 -Di-tert-amylphenyl) benzotriazole, 2- (2'-hydroxy-4'-octoxy Yl) benzotriazole, 2- (2'-hydroxy-3 '-(3', 4 ', 5', 6'-tetrahydrophthalimidomethyl) -5'-methylphenyl) benzotriazole, 2,2 '-Methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazolyl-2-yl) phenol], 2- (2'-hydroxy-5'-meta Krilloxyphenyl) -2H-benzotriazole, 2,2'-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6-[(2H-benzotriazol-2-yl) phenol ], 2- (2'-hydroxy-3 ', 5'-di-t-amylphenyl) benzotriazole, 2-ethylhexyl-2-cyano-3,3'-diphenylacrylate, ethyl- A method for manufacturing an antistatic hard coating luminance-enhancing optical element, characterized in that at least one of 2-cyano-3,3'-diphenyl acrylate. The method of claim 1, In the step (a), the curing agent is at least one of an isocyanate compound, an epoxy compound, an aziridine compound, a metal chelate compound, a metal alkoxide metal salt, an amine compound, a hydride compound, antistatic hard coating brightness improving optical element Manufacturing method. An antistatic hard coating luminance improving optical element, which is manufactured by the method for manufacturing an antistatic hard coating luminance improving optical element according to any one of claims 1 to 12.

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