KR100959273B1 - Back Light Sheet - Google Patents

Abstract

The present invention relates to an optical functional sheet for a backlight unit, and more particularly, to a backlight having a multi-layer coating and a transfer laminating treatment on various optical functional sheets to provide scratch resistance, environmental resistance, durability, pollution resistance, and antistatic function. It relates to an optical functional sheet for a unit.

Back light unit, photo functional sheet, antistatic agent, solvent type UV resin, acrylic urethane

Description

Optical functional sheet for backlight unit {Back Light Sheet}

The present invention relates to an optical functional sheet for a backlight unit, and more particularly, to a backlight having a multi-layer coating and a transfer laminating treatment on various optical functional sheets to provide scratch resistance, environmental resistance, durability, pollution resistance, and antistatic function. It relates to an optical functional sheet for a unit.

Commercially available optical functional sheets for backlight units have implemented protection functions by surface coating. Removal protection PSA is used for material parts of the display industry in order to prevent scratches during assembly lines or product transfer. Recently, Korean Patent No. 10-0583225 discloses a light diffusion light collecting sheet and its manufacture. In the method, the so-called prism, that is, the convex and convex, is used to form a concave-convex shape to form a kind of external pattern consisting of acid and valleys, so that the pattern itself forms a 2mm pixel in a kind of scratch shape so that a minute scratch occurs. No damages were made and good scratch resistance was compensated for. It did not consider the fundamental protection function, pollution resistance and antistatic function.

In addition, Korean Patent No. 10-0582926 discloses a technique of thinning by integrating a plurality of optical functional sheets (diffusion sheet, prism sheet, and protective sheet) in a single sheet in a backlight unit for a liquid crystal display device. Although one sheet still needs protective coatings, it focuses only on the technology of integrating light diffusion and condensing into one sheet, and does not mention surface protective coatings. In addition, a dozen other cases, such as Korean Patent Publication No. 2006-125290, disclose technologies related to light scattering, collection, transmission control, and miniaturization or enhancement of various optical functional sheets related to display component materials. As the thin film of the delicate optical functional sheet that becomes thinner becomes functional, the pattern of condensing and diffusing functions is reduced to micro size, and the density of the pattern is densely increased. By using composite materials to maximize optical functionality, the importance of protecting these optical functional materials and delicate surface patterns is increasing in proportion to the advancement.

Meanwhile, Korean Laid-Open Patent Publication No. 2000-0001824 coats a conductive polymer for the purpose of shielding electromagnetic waves of electronic components and monitors.A conductive polymer having high conductivity and high transparency that improves durability of the coating layer by introducing acrylic UV resin as a binder is disclosed. A hard coating solution composition is disclosed, and Korean Unexamined Patent Publication No. 2000-0025078 similarly introduces quaternary ammonium as an antistatic function, which is bonded to an acrylic UV resin by a double bond of a monomer to form a coating film. A curable antistatic hard coating composition is disclosed, and Korean Laid-Open Patent Publication No. 2000-000623 improves photocurability by introducing a hydrolyzable silane compound to remove moisture in the air introduced during the manufacturing process and removing residual moisture. Photocurable compositions and photocurables are disclosed. Lastly, Korean Laid-Open Patent Publication No. 2004-0042624 uses a polarizer to protect the polarizer plate by laminating a TAC film on both sides of the polarizer using an adhesive instead of a surface coating to form a protective layer / optical layer / protective layer to introduce surface protection. A panel is disclosed.

As such, the surface protection coatings on the optically functional sheets of parts, polarizers, diffusion sheets, prism sheets, or integrated sheets in the display industry are perfectly scratched and damaged when scratched on the assembly line, when the sheets are fluttered, or in other shocks. It must be prevented, optically inert to UV / Visible, and free of chromophores. The protective sheet is not required even after assembly, which is more effective for thinning. In addition, antistatic function (surface resistance of 10-10Ω / sq or less) must be achieved to prevent particle adsorption which causes the biggest defect of the assembly line, and also to prevent the removal of the protective film. There is no damage to fine patterns or safety accidents (electrostatic shock). In addition, cleanliness of 1000 class or less is essential in order to avoid contamination with dust in the surface protection coating process, and it completely eliminates moisture and oxygen to achieve complete curing to satisfy coating film hardness, and to prevent unreacted residual monomers or dimers. The contamination of the display panel should be prevented, and there is a need for a technique in which there is no deformation or residual stress of a fine pattern of the photofunctional sheet even after coating and coating film formation. In addition, in the light converging and light diffusing functions of these sheets, a method of manufacturing an inexpensive optical functional sheet should be introduced by manufacturing microsized fine irregularities on the surface of the coating film in a continuous process with high reliability and precision.

Accordingly, in the present invention, the optical functional sheet for the backlight unit having excellent scratch resistance, environmental resistance, durability, pollution resistance, and antistatic function can be manufactured by subjecting various optical functional sheets of the backlight unit to multi-layer coating and transfer laminating. And the present invention was completed.

Accordingly, it is an object of the present invention to provide an optical functional sheet for a backlight unit that has achieved scratch resistance, environmental resistance, durability, pollution resistance and antistatic function.

In order to achieve the above object, in the present invention, by applying a solvent-type UV resin composition and formulation of the antistatic agent, various optical functional sheets are subjected to surface multi-layer coating and transfer laminating to provide scratch resistance, environmental resistance, durability, and resistance. Provided is a photo-functional sheet for a backlight unit having contaminant and antistatic functions.

In the present invention, the UV-curing resin and AS coating, in addition to the surface protection of the optical functional sheets in the assembly process of the display material component, polarizing plate, diffuser plate, light collecting plate, as well as the adsorption of dust adsorption and the anti-static and protective sheet of the backlight unit, and also transfer In addition, it is economical to achieve contamination resistance at the source by simultaneously working in a clean room, even up to the surface protective adhesive film for removal and storage required for storage and handling.

On the other hand, by parallel with the photo-functional sheet manufacturing line, by completing the material parts from the in-line to the surface adhesive tape for removal, it is effective in improving export competitiveness by preventing perfect contamination and preventing defects, in particular, maximizing production efficiency.

Hereinafter, the present invention will be described in more detail.

The present invention relates to the display industry, and more particularly, to improve the stability and protection function of a component material composed of a backlight unit, that is, a light collecting sheet, a light guide sheet, a diffusion sheet, a prism sheet, or a protective sheet. It imparts environmental and light resistance to such functional sheets, and also provides antistatic function by preventing fine surface pattern damage and dust adsorption of the photofunctional sheet by static electricity, and also prevents fouling resistance and prevents photoconductive sheet manufacturing line and In tandem, the surface adhesive tape for removal is produced in-line.

The optical functional sheet for a backlight unit according to the present invention comprises a general film (from the bottom to an optical functional sheet selected from the group consisting of a light collecting sheet, a light guide sheet, a diffusion sheet, a prism sheet, and a protective sheet manufactured or marketed by a conventional method). A base film), a release coating layer (Release coating), an antistatic agent treatment layer, a UV resin layer, a sheet consisting of an adhesive and a protective film (Fig. 3) can be prepared by laminating.

In another embodiment, the optical functional sheet for a backlight unit according to the present invention is general to an optical functional sheet selected from the group consisting of a light collecting sheet, a light guide sheet, a diffusion sheet, a prism sheet, and a protective sheet which are manufactured or marketed in a conventional manner. A film (base film), a release coating layer (Release coating), a UV resin-antistatic agent mixed layer, a pressure-sensitive adhesive and a protective film can be prepared by laminating (Fig. 4).

The photofunctional sheet mentioned below refers to a material selected from the group consisting of a light collecting sheet, a light guide sheet, a diffusion sheet, a prism sheet, and a protective sheet which are manufactured or marketed by conventional methods well known in the art.

In another embodiment, the optical functional sheet for a backlight unit according to the present invention may have a structure consisting of a photofunctional sheet, an antistatic agent treatment layer, a UV resin layer, and a protective film from below (FIG. 5); Or it may have a structure consisting of a light functional sheet, a UV resin-antistatic agent mixed layer and a protective film (Fig. 6).

In addition, the optical functional sheet for the backlight unit according to the present invention, as shown in Figure 7, in order to remove the protective film, protective coating, prism sheet, pressure-sensitive adhesive layer, diffusion sheet, antistatic agent treatment layer, protective coating and removal from below It may have a structure of an antistatic protective tape.

In addition, the optical functional sheet for the backlight unit according to the present invention, as shown in Figure 8, from the bottom to remove the protective film, protective coating, integrated sheet (diffusion + condensation), antistatic agent treatment layer, protective coating and removal It may have a structure of an antistatic protective tape.

The general film used in the present invention may use a PC (polycarbonate) or PET (Polyethylene Terephthalate) film, but is not limited thereto.

The release coating layer was prepared by coating Dow Corning 176 catalyst or Syl-Off 23A catalyst with a xylene solvent at a thickness of 1-5 μm on a general film at 30% solids and then drying at 120 ° C. do.

The antistatic agent treatment layer is mixed methylhydrogen dimethyl siloxane copolymer (CAS68037-59-2) and amino group siloxane (CAS 192888-42-9) in a 1: 1 weight ratio and toluene or methyl ethyl ketone (MEK) as a solvent Dilute with 20% solids.

As an antistatic agent, a stable conductive polymer was used instead of the surfactant system which avoids inorganic systems affecting UV-Visible and light scattering / transmission, and which may also cause transition. In the present invention, the operator's safety and anti-particle adsorption, suitable antistatic function is a surface resistance of 1010Ω / sq is typically required by the user in the display industry by a variety of existing tests. In this embodiment, the antistatic function was spherical into two types. First, methylhydrogendimethylsiloxane copolymer (CAS68037-59-2) and amino group siloxane (CAS 192888-42-9) were used as various conductive polymers, and the antistatic agent was mixed with UV coating solution. The antistatic agent solution was first coated and the UV resin solution was coated thereon to complete the surface protection treatment.

The UV resin layer is mixed with 20-60% by weight of the oligomer, 10-50% by weight of the diluent and 10-50% by weight of the solvent, the solvent is removed from the drying furnace and cured with UV in the UV zone of the end of the drying furnace. .

The oligomers used in the present invention are multifunctional aliphatic urethane acrylates, and include, for example, BR-900 series of Bormar, including BR-941, BR-970 and BR-990; MIRAMER PU-610 aliphatic 6 functional urethane acrylate, MIRAMER PU-620 aliphatic 6 functional urethane acrylate, MIRAMER PU-340 aliphatic trifunctional urethane acrylate, MIRAMER PU-350 aliphatic trifunctional urethane acrylate; And CN9010 aliphatic urethane acrylate oligomers, CN989 aliphatic urethane acrylate CN966H90, SR306 blend urethane acrylate and SR256 blend CN963A80 urethane acrylate from Sartomer.

The reason why the polyfunctional aliphatic urethane acrylate is selected in the present invention is that the compatibility with the antistatic agent (conductive polymer), durability, light resistance, and scratch resistance are taken into consideration. Specifically, in order to exhibit desired physical properties with a thin film of 5 μm or less, Since the reaction site of the oligomer or the reactive monomer should be 4 or more, the elongation is better than that of the acrylic resin, and the urethane having the toughness is introduced. In addition, in the present invention, a solvent type UV resin composition was selected to prevent deformation and residual stress of the photofunctional fine pattern. Solvent-free UV resins have a relatively high molecular weight and thus use a lot of diluents compared to oligomers, resulting in a small molecular skeleton, resulting in poor thermal stability, shrinkage resistance, and tensile strength. Solvent-type UV resin composition uses a mixture of oligomers and diluents (reactive monomers) with various solvents (toluene, EA, MEK, IPA), preferably solubility parameters and volatilization rates (different boiling of solvents). 3-4 kinds of solvents are mixed and the viscosity is lowered to 150 cps to improve the wettability of the thin film on the fine pattern of the optical functional sheet, and the solvent and the residuals while passing through a 120 ° C. dry oven. In the process of removing the moisture to form a thin film, the stress existing between the coating solution and the fine pattern is removed, and the oligomer and the diluent are dispersed and disposed at a constant thickness, and then subjected to UV irradiation under a nitrogen gas purge (reflux) (blocking moisture and oxygen). Completely cured. As such, when using the solvent-type UV resin composition according to the present invention, it is not necessary to use the hydrolyzable silane compound disclosed in Korean Patent Laid-Open No. 2000-000623 for air blocking and removal of residual water. As can be seen, by removing the moisture and volatiles in a 120 ° C. drying furnace (25 m length), the film is thinned and UV cured at high boiling points and under a nitrogen gas reflux (with oxygen and moisture in the atmosphere) (FIGS. 1 and 2B). Curing efficiency is improved to achieve near complete curing conditions.

Reactive monomer (diluent) used in the present invention is trimethylolpropane triacrylate (TMPTA), Tripropylene Glycol Diacrylate (TPGDA), Acryloyl Morpholine (ACMO), Di-trimethylolpropane triacrylate (DMPTA), Dipentaerythritol pentaacrylate (DEPTA), Pentaerythritol tetraacrylate (PETA) and ER M600 dipentaerythritol hexaacrylic And latex (Dipentaerythritol hexaacrylate; DEHA).

The solvent used in the present invention may be selected from the group consisting of ethyl acetate, butyl acetate, toluene, xylene and methyl ethyl ketone (MEK), and may be used by mixing two or more kinds thereof. For example, ethyl acetate, butyl When mixing acetate, toluene and xylene, the mixing ratio is preferably 3: 3: 2: 1, and when mixing ethyl acetate, butyl acetate, toluene and methyl ethyl ketone, 2: 2: 3: 4 is preferable. It is not limited only to this.

In the present invention, it is also possible to form a mixed layer in which the antistatic agent and the UV resin composition are mixed. In this case, the mixing ratio of the antistatic agent and the UV resin composition is preferably 20: 1 to 15: 1, and the mixed composition is applied to a thickness of 5 to 6 μm, and then dried in a 70-120 ° C. drying furnace as shown in FIG. UV curing in a wave shape as shown in Figure 2b as 500mJ / cm2 UV irradiation in the chamber (1-4). As mentioned above, a conventional UV prism sheet is coated with a high viscosity UV oligomer and a diluent without using a solvent as shown in FIG. 2A and realizes unevenness (a kind of wavy shape), but has high coating properties and adhesion. In order to overcome the disadvantages of residual stress, molecular weight and content limits of oligomers and limitations of various formulations, this study solved this problem by UV curing as shown in FIG. 2B after drying with a solvent.

Pressure Sensitive Adhesive used in the present invention is an acrylic pressure-sensitive adhesive, and put various acrylic monomers into ethyl acetate as a solvent, and prepare an acrylic copolymer by adding an azo compound (AIBN) and a peroxide of Wako's polymerization initiator. For example, 5 to 10% by weight of isobutyl acrylate monomer, 5 to 10% by weight of 2-ethylhexyl acrylate monomer, 5 to 10% by weight of vinyl acetate monomer, and 2-hydroxyhexyl based on the total weight of the pressure-sensitive adhesive composition. 5-10% by weight of acrylate monomer, 10-20% by weight of ethyl acrylate monomer, 3-8% by weight of acrylamide, 5-10% by weight of acrylic acid, 40-50% by weight of ethyl acetate as solvent, 2,2 as polymerization initiator 0-5% by weight of azobis (2,2-azobis (2,4-dimethyl valeronitrile); AIBN) and 0-5% by weight of benzoyl peroxide as peroxide Highly functionalized by addition Acrylic copolymers may be used, but are not limited thereto.

The protective film used in the present invention is prepared by the method described in Korean Patent Laid-Open No. 2002-0072653. The protective film is a high transparency PE film 5-10% by weight of isobutyl acrylate monomer, 5-10% by weight of 2-ethylhexyl acrylate monomer, 5-10% by weight of vinyl acetate monomer, 10-20% by weight of ethyl acrylate monomer. %, 40-50 wt% ethyl acetate, 30-40 wt% solvent, 3-8 wt% acrylamide, 5-10 wt% acrylic acid, 5-10 wt% resin, and 0-5 wt% hardener After applying the pressure-sensitive adhesive made of an acrylic copolymer, it is completed by drying and aging at an appropriate temperature and humidity conditions. In this case, the curing agent may be an epoxy-based curing agent such as polyamine (PA) polyamido resin (PAR: Polyamido Resin) and polysulfide resin (Polysulfide Resin); Phosphate curing agents such as tri-basic sodium phosphate (TSP) and tri-sodium orthophosphate (Tri-sodium Orthophosphate); And dimethylamino-ethylmethacrylate, 4,4-dicyclohexylmethane diisocyanate, isophorone diisocyanate, 2,4,6-triisopropylphenyl diisocyanate, 4,4-diphenylmethane diisocyanate, tolidine Isocyanate-type hardeners, such as diisocyanate and naphthalene diisocyanate; It can select and use 1 or more types from the group which consists of.

Hereinafter, the manufacturing process of the optical functional sheet for the backlight unit according to the present invention will be described.

First, as shown in FIGS. 1 and 2B, a 1-2 μm antistatic agent is coated on a 25 μm thick PC or PET film having a 1-2 μm release agent applied on one side of the film, and then a solvent-based UV resin is applied. 3 μm coated and passed through a drying furnace and then through a UV-irradiation furnace under nitrogen gas reflux to completely cured and coated with an acrylic adhesive 3 μm to complete the sheet having the structure shown in FIG. 3.

If necessary, it can also be carried out by adding an antistatic agent to the UV resin as shown in Figure 4, the sheet of Figures 3 and 4 is coated with a pressure-sensitive adhesive is used to laminate it in the optical functional sheet in the backlight unit manufacturing do.

In addition, the sheet having the structure of FIGS. 5 and 6 may be manufactured by coating UV resin and antistatic agent directly on various photofunctional sheets of the backlight unit. As such, FIGS. 5 and 6 also paralleled the following process designs and examples to pursue the efficiency and completeness of performing a protective coating on the photofunctional sheet. That is, it is desirable to install a protective coating manufacturing line on the photonic sheet manufacturing line in terms of economics, including defects of advanced IT products, production efficiency and logistics costs in mass production. In this way, after completing the coating of the optical functional material of the optical functional sheet, and subsequently to the anti-static (anti-static agent) coating or protective coating and protective film coating and laminating. The approximate process chart is as follows. Light diffusion function is applied to one surface of 50 µm thick PC or PET film, and the glass beads of several µm diameter are applied and dried to a thickness of 10 µm in a solution dispersed in a solvent type UV resin, and the thickness of 20 µm on the other side The solution dispersed in the solvent-type UV resin is applied and dried to a thickness of 10 μm, the solvent-type UV resin is applied to the opposite side with a thickness of 20 μm, passed through a thermal drying furnace to remove the solvent, and then the solvent-free in the last UV chamber. As convex lens-shaped irregularities as UV irradiation in the state of being embossed to the caterpillar while passing through a caterpillar of a silicon or PC material having irregularities as shown in FIG. 2B in a UV solution (oligomer, diluent, photoinitiator, etc.) It is cured to give excellent light collecting function (so-called prism sheet) in the range of refractive index 1.4-1.5 (nisisnθi = nfsinθf), and UV protection coating is applied on the backlight unit (protective plate + light collecting plate + enlargement) as above. The place of the cover feature in version). And finally it can be completed in a roll state by laminating the antistatic agent treated protective film (PSA).

Hereinafter, the present invention will be described in more detail with reference to the following examples. These examples are only for illustrating the present invention in more detail, and the scope of the present invention is not limited by these embodiments in accordance with the gist of the present invention to those skilled in the art. Will be self-evident.

Example 1

The optical functional sheets for the backlight unit of Example 1 were prepared according to the UV resin compositions shown in Table 1 below, and their viscosity, surface resistance, light resistance, fouling resistance, and coating film strength were respectively shown.

ingredient Content (% by weight) MIRAMER PU-610 (Miwon Corporation) 40 Trimethylolpropane triacrylate (TMPTA) 17 Mix EA, BA, Toluene and Xylene in 3: 3: 2: 1 40 Methylhydrogendimethylsiloxane and amino group siloxane are mixed in a 1: 1 weight ratio 3 Viscosity (cps) 150 Surface Resistance (Ω / sq) (KS 1109) 10-9 Permeability / HAZE ASTM D 1003 91.7 / 1.23 Light resistance test (KS R 0021) No discoloration (yellowing) Pollution Resistance Test (KS M 3803) clear Coating Strength (ASTM D3363) 4H

1 and 2b, first, a release agent prepared by mixing a Dow Corning 176 catalyst in a xylene solvent at 30% solids was applied to a surface of a 25 μm-thick PET film (base film) at a thickness of 2 μm. After drying at 120 ℃ to form a release treatment layer. Methylhydrogendimethylsiloxane copolymer (CAS68037-59-2) and amino group siloxane (CAS 192888-42-9) were mixed 1: 1 in the release treatment layer, and an antistatic agent having a solid content of 20% prepared by dilution with toluene was 1 After coating at -2㎛ to form an antistatic agent treatment layer, and then coated with a 5㎛ coating solvent type UV resin through a drying furnace and then completely cured by passing through a UV-irradiation furnace under nitrogen gas reflux to form a UV resin layer After the coating and drying the acrylic adhesive 3㎛ and forming a protective film (Korean Patent Publication No. 2002-0072659) to prepare a sheet having the structure shown in Figure 3 and laminating it on the prism sheet of Example 1 The optical functional sheet for backlight units was completed.

[Example 2]

In Example 1, a sheet having the structure shown in FIG. 4 was manufactured in the same manner as in Example 1 except that the antistatic agent and the UV resin were mixed to form one layer, that is, the UV-antistatic agent mixed layer. Then, it was laminated on the prism sheet to complete the optical functional sheet for the backlight unit of Example 2.

Example 3

Methylhydrogendimethylsiloxane copolymer (CAS68037-59-2) and amino group siloxane (CAS 192888-42-9) 1: 1 were mixed on the prism sheet to prepare an antistatic agent having a solid content of 20% by dilution with toluene. Coating at 2 μm to form an antistatic agent treatment layer, and then 5 μm coated solvent-type UV resin (the composition of Example 1 described in Table 1) through a drying furnace and then through a UV-irradiation furnace under nitrogen gas reflux. After completely curing to form a UV resin layer to form a protective film (Korean Patent Publication No. 2002-0072659) to complete the optical functional sheet for a backlight unit having a structure shown in FIG.

Example 4

Methylhydrogendimethylsiloxane copolymer (CAS68037-59-2) and amino group siloxane (CAS 192888-42-9) 1: 1 mixed on the prism sheet, antistatic agent and solvent type of 20% solids prepared by dilution with toluene After mixing the UV resin (composition of Example 1 shown in Table 1) and coated to a thickness of 5㎛ pass through the drying furnace, and then completely cured through the UV-irradiation furnace under nitrogen gas reflux to form a UV-antistatic agent mixed layer A protective film (Korean Patent Laid-Open Publication No. 2002-0072659) was formed to complete an optical functional sheet for a backlight unit having the structure shown in FIG. 6.

1 is a flowchart illustrating a process of manufacturing a photofunctional sheet for a backlight unit according to the present invention.

Figure 2a is a flow chart showing a conventional prism sheet manufacturing process.

Figure 2b is a flow chart showing a prism sheet manufacturing process according to the present invention.

3 and 4 are cross-sectional views of the protective sheet applied to the optical functional sheet according to the present invention.

5 to 8 are cross-sectional views of the optical functional sheet for backlight unit according to the present invention.

Claims (11)

At least one optical functional sheet selected from the group consisting of a light collecting sheet, a light guiding sheet, a diffusion sheet, a prism sheet, and a protective sheet, in order from the bottom, a polycarbonate (PC) or polyethylene terephthalate (PET) film, a release coating, and a charging An optical functional sheet for a backlight unit manufactured by laminating a sheet made of an inhibitor treatment layer, a UV resin layer, an adhesive, and a protective film. delete delete delete delete delete According to claim 1, wherein the composition of the antistatic agent is characterized in that the composition consisting of 20% solids of methylhydrogendimethylsiloxane copolymer and amino group siloxane mixed in a 1: 1 weight ratio and diluted with toluene or methyl ethyl ketone (MEK). Optical functional sheet for backlight units. The optical functional sheet for a backlight unit according to claim 1, wherein the UV resin layer has a composition of 20-60 wt% of an oligomer, 10-50 wt% of a diluent, and 10-50 wt% of a solvent. The optical functional sheet for a backlight unit according to claim 8, wherein the oligomer is an aliphatic urethane acrylate. The method of claim 8, wherein the diluent is trimethylolpropane triacrylate (TMPTA), Tripropylene Glycol Diacrylate (TPGDA), Acryloyl Morpholine (ACMO), Di- Di-trimethylolpropane triacrylate (DMPTA), Dipentaerythritol pentaacrylate (DEPTA), Pentaerythritol tetraacrylate (PETA) and ER M600 dipentaerythritol hexaacrylate (DMPTA) Dipentaerythritol hexaacrylate; DEHA) optical functional sheet for a backlight unit, characterized in that selected from the group consisting of. The optical functional sheet for a backlight unit according to claim 8, wherein the solvent is selected from the group consisting of ethyl acetate, butyl acetate, toluene, xylene, and methyl ethyl ketone (MEK) and mixed in at least two kinds thereof. .

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