KR101860116B1 - Light curing type imprinting composition for fine patterning of light guide panel for display devices, imprinted light guide panel thereof, and back light unit and display device containing the same - Google Patents

Abstract

The present invention relates to an imprinting coating composition for pattern formation on a display light guide plate comprising a (meth) acrylate polymer, a silicone compound, a polyfunctional acrylate oligomer, an acrylate monomer, and a photoinitiator, And it is possible to produce a fine and precise pattern by using an imprinting coating agent on the light guide plate so as to be uniformly supplied to the upper part of the light guide plate, and exhibits excellent light transmittance, excellent luminance, vulcanization resistance and very low color deviation, as well as properties such as hardness and scratch resistance To an excellent coating composition.

Description

TECHNICAL FIELD [0001] The present invention relates to a light-curing imprinting composition for forming a light guide plate fine pattern, an imprinting light guide plate for the light guide plate, a backlight unit including the light guide plate, and a backlight unit and a display device thereof. BACKGROUND OF THE INVENTION LIGHT UNIT AND DISPLAY DEVICE CONTAINING THE SAME}

The present invention relates to a photocurable imprinting composition for forming a fine pattern on a light guide plate for a display and a fine pattern formation imprinting light guide plate obtained by coating the same, a backlight unit (BLU) including the same and a display device.

Generally, the backlight unit (BLU) functions to uniformly illuminate the display image on the back surface of the LCD, which has no self-luminous force, so that the light incident from the bottom and / So that the light is emitted at a uniform brightness.

The backlight unit BLU serves to uniformly spread the light emitted from a light emitting diode (LED) or a cold cathode fluorescent lamp (CCFL) as a surface light source over the entire screen. Various parts are used in combination to brighten the brightness (brightness) of light.

The basic structure of the backlight unit BLU includes a light source, a reflection sheet, a light guide panel (LGP), a diffusion sheet, a prism sheet, and a protection sheet .

The performance of such a backlight unit (BLU) is influenced by the light guide plate. The light guide plate (LGP) minimizes the light loss of the light source incident from the side and uniformly transmits and distributes the light evenly over the front surface of the screen. The light guide plate (LGP) forms a specific pattern on the surface of the LGP to disperse the light. At this time, it is important to increase the efficiency of light emitted upward to realize a high luminance and maintain a uniform luminance distribution.

Meanwhile, conventional methods of producing patterns on the surfaces of tabs, notebooks and display panels (LGP) for TVs are mainly an injection method, a printing method, a roll-stamping method and a laser method.

In the case of the injection method, it is difficult to manufacture a large size light guide plate, and it is not applicable when the thickness of the light guide plate is reduced.

In the case of the printing method, it is not suitable for the light guide plate pattern of the fine pattern tendency in the future because the cost of the printing part such as plate making is high, the light collecting pattern is difficult to be formed, and the implementation of the fine pattern is difficult.

In the case of the roll-stamping method, reproducibility is insufficient and it is difficult to manufacture a large-sized light guide plate, and it is not applicable when the thickness is reduced.

In the case of the laser method, the processing time is long and the equipment investment cost is increased. Recently, since the demand of the low price type light guide plate is greatly increased, the existing laser method has a limitation in increasing the productivity and lowering the price. Although a light guide plate having a thickness of about 2.2 to 3 mm is currently in use, it is expected that a light guide plate having a thickness of about 1.5 mm or about 1 mm will be used in the near future. A thin light guide plate having a thickness of about 1.5 mm to about 1 mm, There is a problem in that it is difficult to apply it because the productivity is low.

Accordingly, it is a first object of the present invention to provide a photocurable imprinting composition for forming a minute pattern of a light guide plate which is remarkably improved in productivity and excellent in price competitiveness as compared with laser patterning of LGP.

Further, the second object of the present invention is to provide a polyolefin resin composition which is excellent in yellowing resistance, excellent in luminance and light transmittance, excellent in hardness and scratch resistance, can prevent a problem of appearance damage which may occur during transportation, (LGP) as a thin film having a fine pattern at a room temperature and having a viscosity of 5 to 3,000 cps at a room temperature, will be.

A third object of the present invention is to provide a light guide plate (LGP), which is excellent in brightness, light transmittance, vulcanization resistance, adhesion strength, hardness, scratch resistance, and excellent scratch resistance which are obtained by coating a photocurable imprinting composition according to the above- And to provide a light guide plate having a low color deviation.

In addition, a fourth object of the present invention is to provide a backlight unit including the above-described light guide plate (LGP).

A fifth object of the present invention is to provide a display device including the above-described backlight unit.

According to a preferred aspect of the present invention to achieve the first and second objects of the present invention, there is provided a thermoplastic resin composition comprising 5 to 50% by weight of a (meth) acrylate polymer represented by the following general formula (1) 0.01 to 10% by weight of a silicone compound, 0.01 to 50% by weight of a polyfunctional acrylate oligomer, 5 to 80% by weight of an acrylate monomer, 0.1 to 10% by weight of a photoinitiator and balance of a solvent: To 3,000 cps, and a refractive index of 1.45 to 1.55.

(Formula 1)

Wherein R ₁ and R ₃ are each independently hydrogen (H-) or methyl (CH ₃ -), R ₂ and R ₄ are each independently hydrogen (H-), methyl (CH ₃ -), A linear aliphatic hydrocarbon, a branched aliphatic hydrocarbon, a cyclic aliphatic hydrocarbon, a polyethylene glycol, or a polypropylene glycol group, n and m are each independently an integer larger than 1, and 10? n + m?

(2)

(Wherein R ₁ is selected from the group consisting of a methyl group (CH ₃ -), an amino group, an epoxy group, an alicyclic epoxy group, a (meth) acryl- R ₂ is selected from the group consisting of methyl (CH ₃ -), phenyl-, linear (aliphatic), linear (aliphatic) aliphatic hydrocarbon, branched aliphatic hydrocarbon, polyethylene glycol, or polypropylene glycol, n and m are each independently an integer greater than 0, and 10? n + m? 100 to be.)

Specifically, the above-mentioned polyfunctional acrylate oligomer may be an aliphatic urethane acrylate oligomer, an aromatic urethane acrylate oligomer, a polyester acrylate oligomer, an epoxy acrylate oligomer, an acrylic acrylate oligomer, or any mixture thereof.

Specifically, the acrylate monomer is selected from the group consisting of ethoxyethoxyethyl acrylate (EOEOEA), ethoxy triethylene glycol methacrylate (ETEGMA), phenoxy ethyl acrylate (PEA), 4-cumyl phenoxy ethyl acrylate Hydroxypropyl acrylate (HPFA), tetrahydrofuryl acrylate (THFA), cyclic trimethylol propane foam acrylate (CTMPFA), 2-hydroxy-3-phenoxypropyl acrylate , Polyethylene glycol monoacrylate (PEGMA), polyethylene glycol monomethacrylate (PEGMMA), polyalkylene glycol monomethacrylate (PAGMMA), polypropylene glycol monomethacrylate (PPGMMA), isobornyl acrylate (IBOA) , Isobornyl methacrylate (IBOMA), 2-hydroxyethyl acrylate (HEA), 2-hydroxymethacrylate (HEMA), 2-hydroxypropyl acrylate (2-HPA) Meta Methacrylic acid (MAA), ethyl methacrylate (EMA), ethyl acrylate (EA), n-butyl methacrylate (MMA) (BMA), isobutyl methacrylate (IBMA), t-butyl methacrylate (TBMA), 2-ethylhexyl methacrylate (EHMA), benzyl methacrylate (BMA), glycidyl methacrylate GMA), N, N-dimethylacrylamide (DMAA), acrylonylmorpholine (ACMO), dipentaerythritol nuclear acrylate (DPHA), dipentaerythritol pentaacrylate (DPPA), pentaerythritol tetraacrylate (PETTA), pentaerythritol tetraacrylate (PETTA) ethylene oxide adduct derivative, pentaerythritol triacrylate (PETA), tri (2-hydroxyethyl) isoanoate triacrylate (THIC), trimethylpropanetriacryl (TMPTA), trimethylpropanetri (TMPTA) ethylene oxide adduct type derivatives, trimethylpropane triacrylate (TMPTMA), trimethylpropane trimethyl acrylate (TMPTMA) ethylene oxide addition type derivatives, tris-2-hydroxyethylisocyanurate triacrylate (THEITA) Triethylene glycol diacrylate (TPGDA), tripropylene glycol diacrylate (TPGDA) ethylene oxide adduct derivative, 1,4-butanediol diacrylate (BDDA), 1,6-hexanediol diacrylate (HDDA) (PEGDMA), polypropylene glycol diacrylate (PPGDA), polypropylene glycol dimethacrylate (PEGDMA), poly (ethylene glycol diacrylate) PPGDMA), cyclohexanedimethanol diacrylate (CHDMDA), dicyclodecane dimethanol diacrylate (DCDDMDA), bisphenol A diacrylate (BADA ) Ethylene oxide addition type derivatives, bisphenol A dimethacrylate (BADMA) ethylene oxide addition type derivatives, or any mixture thereof.

The photoinitiator may be a hydroxyketone photoinitiator, an aminoketone photoinitiator, a phenylglyoxylate compound, a benzyldimethylketalate compound, or a phosphine compound.

Specifically, the photoinitiator described above may be selected from the group consisting of 1-hydroxycyclohexyl phenyl ketone, benzophenone, 2-hydroxy-2-methyl- 2-phenyl-acetoxy-ethoxy] -ethyl ester and oxy-phenyl (2-oxo-phenyl) -Acetic acid 2- [2-hydroxy-ethoxy] -ethyl ester, a mixture of alpha-alpha-dimethoxy-alpha-phenylacetophenone, 2-benzoyl- 2- (dimethylamino) (4-morpholinyl) phenyl] -1-butanone, 2-methyl-1- [4- , 6-trimethylbenzonyl) -phosphine oxide, phosphine oxide phenylbis (2,4,6-trimethylbenzonyl), bis (eta 5-2,4-cyclopentadien- (4-methylphenyl) [4- (2-methylpropyl) phenyl] -hexafluorophosphate, diphenylketone Benzene dimethyl ketal, 4-hydroxycyclophenyl ketone, dimethoxy-2-phenylacetophenone, anthraquinone, fluorene, triphenylamine, carbazole, 3-methylacetophenone, 4-dimethoxyacetophenone, 4,4-diaminobenzophenone, or any mixture thereof.

The above-mentioned solvents may be alcohol-based, ketone-based, ether-based, hexane-based or benzene-based solvents.

Specifically, the solvent is selected from the group consisting of methanol, ethanol, isopropanol, 2-methoxyethanol, butanol, isooctanol, methylcellulose, ethylsorbose, isopropylcellosolve, butylcellosolve, methylcarbitol, ethylcarbitol, Methyl ethyl ketone, methyl isobutyl ketone, diethyl ketone, dipropyl ketone, dibutyl ketone, cyclohexanone, methyl acetate, ethyl acetate, butyl acetate, hexane, Heptane, octane, benzene, toluene, xylene, or any mixture thereof.

On the other hand, the photocurable imprinting composition described above further contains 0.001 to 5% by weight as a total amount of an antioxidant, a UV absorber, a light stabilizer, a thermal polymerization inhibitor, a leveling agent, a surfactant, a lubricant, an antifouling agent or a release agent .

delete

The third object of the present invention is to provide a light guide panel (LGP) comprising a pattern-formed coating layer by imprinting a photocurable imprinting composition for forming a light guide plate fine pattern on at least one side of a substrate, . ≪ / RTI >

Here, the thickness of the imprinting coating layer formed on the light guide plate is 1 to 100 탆, and a predetermined fine pattern is formed on the surface.

The fourth object of the present invention can be achieved by a back light unit (BLU) including the light guide plate described above.

The fifth object of the present invention can be achieved by a liquid crystal display device including the backlight unit described above.

The photocurable imprinting composition for forming a light guide plate fine pattern according to the present invention has excellent handleability because it has excellent vulcanization resistance, brightness, light transmittance, very low color deviation, excellent hardness and scratch resistance, (LGP) can be easily imprinted on a light guide plate (LGP) due to its easy coating workability due to its low viscosity at room temperature, The light guide plate having imprinting of the photocurable imprinting composition according to the present invention in a predetermined fine pattern has remarkably high productivity and economical efficiency as compared with the laser patterning and has excellent brightness, light transmittance, vulcanization resistance, hardness, It has low color deviation.

Hereinafter, the present invention will be described in detail.

The photocurable imprinting composition for forming a light guide plate fine pattern according to the present invention comprises a (meth) acrylate polymer represented by the following Formula 1, a silicone compound represented by the following Formula 2, a polyfunctional acrylate oligomer, an acrylate monomer, a photoinitiator, Of solvent.

(Formula 1)

Wherein R ₁ and R ₃ are each independently hydrogen (H-) or methyl (CH ₃ -), R ₂ and R ₄ are each independently hydrogen (H-), methyl (CH ₃ -), A linear aliphatic hydrocarbon, a branched aliphatic hydrocarbon, a cyclic aliphatic hydrocarbon, a polyethylene glycol, or a polypropylene glycol group, n and m are each independently an integer larger than 1, and 10? n + m? 1,000.

(2)

(Wherein R ₁ is selected from the group consisting of a methyl group (CH ₃ -), an amino group, an epoxy group, an alicyclic epoxy group, a (meth) acryl- R ₂ is selected from the group consisting of methyl (CH ₃ -), phenyl-, linear aliphatic (-), polyether-, carboxyl-, phenyl- or hydroxyl ) Branched hydrocarbon, polyethylene glycol, or polypropylene glycol, n and m are each independently an integer greater than 0, and 10? N + m? 100 .)

The (meth) acrylate polymer represented by Formula 1 may preferably be a polyfunctional (meth) acrylate having a refractive index of 1.45 to 1.55 and a molecular weight of 10,000 to 150,000.

The (meth) acrylate polymer represented by the formula (1) is preferably contained in an amount of 5 to 50% by weight based on the total weight of the coating composition. When the amount of the (meth) acrylate polymer represented by the above formula (1) is less than 5% by weight based on the above-mentioned criteria, it may be difficult to impart imprinting patterning property, hardness and proper adhesiveness of the coating film, On the other hand, if it exceeds 50% by weight, the viscosity tends to be high, which may cause problems in workability, which is also undesirable.

The silicone compound represented by Formula 2 is preferably contained in an amount of 0.01 to 10% by weight based on the total weight of the coating composition. If the addition amount of the silicone compound represented by the formula 2 is less than 0.01% by weight, it may be difficult to impart the imprinting patterning property of the coating film, and if it is more than 10% by weight Is also undesirable because it may cause a decrease in the curing rate, induce yellowing, decrease in light transmittance and luminance, and decrease in adhesion to the substrate.

Also, in the present invention, it is preferable that the polyfunctional acrylate oligomer is a polyfunctional acrylate oligomer having a refractive index of 1.45 to 1.55 and a molecular weight of 500 to 10,000.

The polyfunctional acrylate oligomer is preferably contained in an amount of 0.01 to 50% by weight based on the total weight of the composition. If the addition amount of the polyfunctional acrylate oligomer is less than 0.01% by weight based on the above-mentioned criteria, it may be difficult to impart imprinting patterning property, elasticity and hardness to the coating film, and conversely, There is a possibility that the color deviation becomes large, the curing rate is lowered and the luminance is decreased, the adhesion to the substrate is deteriorated, and the viscosity is too high, which causes a problem in workability, which is also undesirable.

The polyfunctional acrylate oligomer may be specifically an aliphatic urethane acrylate oligomer, an aromatic urethane acrylate oligomer, a polyester acrylate oligomer, an epoxy acrylate oligomer, an acrylic acrylate oligomer, or any mixture thereof.

Specifically, the above-mentioned aliphatic urethane acrylate oligomer is a mixture of CN8000NS (having 6 functional groups, viscosity of 14,000 cps at 25 ° C, Satomer), CN8007NS (having 4 functional groups, viscosity of 1,250 cps at 25 ° C, Satomer), CN8009NS CN8001NS (having a viscosity of 6,800 cps at 25 ° C, Satomer), CN8881NS (two functional groups, viscosity of 20,000 to 40,000 cps at 60 ° C, Satomer), CN9001NS (two functional groups, viscosity of 46,500 cps @ 60 ° C, Satomer), CN9010NS (6-functional group, viscosity of 2,200 cps at 60 ° C, Satomer), CN9013NS (9 functional groups, viscosity 10,000 cps at 60 ° C, Satomer), Miramer PU210 (6 functional group, viscosity 100,000 cps @ 25 占 폚, Miwon Chemical Co., Ltd.), Miramer PU620 (6 functional groups, 25 parts by weight), Miramer PU340 (three functional groups, viscosity 75,000 cps at 25 占 폚, Miwon Chemical), Miramer PU610 (Viscosity of 60,000 cps at 25 ° C, trade name of Miwon Company), Miramer PU664 (6 functional groups, viscosity of 61,000 at 25 ° C, Miwon), Miramer SC2153 (10 functional groups, viscosity of 140,000 cps at 25 ℃, Miwon) 6 functional group, molecular weight (MW) about 1,0 (6-functional group, molecular weight (MW) of about 1,000, and ESK-CYTEC), Ebecleil 5129 (6-functional group, molecular weight about 800, SKCSOTEC), or any mixture thereof may be used.

Specifically, the above aromatic urethane acrylate oligomer was prepared by mixing CN975NS (6 functional groups, viscosity 500 cps at 60 ° C, Satomer), CN978NS (2 functional groups, viscosity 3,200 cps at 60 ° C, Satomer), Miramer PU280 600 (2 functional group, viscosity of 2,000 ~ 4,000 cps at 50 ° C, Kyoeisha), AT-600 (viscosity of 30,000 cps at 25 ° C, (4-functional group, viscosity 10,000 ~ 20,000 cps at 25 ° C, manufactured by Kyoeisha), or any mixture thereof.

Concretely, the above-mentioned polyester acrylate oligomer was prepared by mixing CN294E (four functional groups, viscosity 5,500 cps at 60 ° C, Satomer), CN7001NS (two functional groups, viscosity 2,500 cps at 25 ° C, Satomer), Miramer PS460 (6-functional group, viscosity of 50,000 cps at 25 ° C, and viscosity of 40,000 cps at 25 ° C, Miwon), Miramer PS610 (6-functional group, viscosity of 40,000 cps at 25 ° C, Miwon), Ebecryl 800 4-functional group, viscosity of 14,000 cps at 25 占 폚, SK-Cytec), or any mixture thereof.

Specifically, the above-mentioned epoxy acrylate oligomer is a mixture of CN104NS (bifunctional group, viscosity 18,900 cps at 49 DEG C, Satomer), CN2003NS (bifunctional group, viscosity 3,495 cps at 60 DEG C, Satomer), Miramer PE110 (monofunctional group, viscosity 140 cps (2 functional group, viscosity 500 cps at 25 ° C, Miwon), Miramer PE320 (3-functional group, viscosity 12,000 cps at 25 ° C, Miwon Chemical), Ebecryl 600 (two functional groups, Viscosity: 3,000 cps at 25 占 폚, SK-Cytec), Ebecryl 3416 (four-functional group, viscosity of 18,000 cps at 25 占 폚, SK Cytec), or any mixture thereof.

Specifically, the above-mentioned acrylic acrylate oligomer was obtained by the following process: Ebecryl 740-40TP (Viscosity 8,500 cps at 25 ° C, SK Cytec), Ebecryl 741 (viscosity 4,500 cps at 25 ° C, (Viscosity: 26,000 cps at 25 ° C, SK-Cytec), or any mixture thereof may be used.

In the present invention, the acrylate monomer controls the viscosity of the photocurable coating composition, increases the elastic force, and maintains excellent brightness, light transmittance and hardness.

More preferably, the acrylate monomer is a low-viscosity polyfunctional acrylate monomer having a viscosity at 25 ° C of 1 to 200 cps.

The acrylate monomer is preferably contained in an amount of 5 to 80% by weight based on the total weight of the composition. If the addition amount of the monofunctional acrylate monomer is less than 5% by weight based on the above-mentioned criteria, the elasticity of the composition is lowered and the viscosity of the composition is lowered, resulting in deteriorated workability. Conversely, And adhesion to the substrate may be deteriorated.

Specific examples of the acrylate monomers include ethoxyethoxyethyl acrylate (EOEOEA), ethoxy triethylene glycol methacrylate (ETEGMA), phenoxy ethyl acrylate (PEA), 4-cumyl phenoxy ethyl acrylate (CPEA) (PPEA), 2-hydroxy-3-phenoxypropyl acrylate (HPPA), tetrahydrofuryl acrylate (THFA), cyclic trimethylol propane foam acrylate (CTMPFA) Polyethylene glycol monoacrylate (PEGMA), polyethylene glycol monomethacrylate (PEGMMA), polyalkylene glycol monomethacrylate (PAGMMA), polypropylene glycol monomethacrylate (PPGMMA), isobonyl acrylate (IBOA) Hydroxypropyl methacrylate (HEMA), 2-hydroxypropyl acrylate (2-HPA), 2-hydroxypropyl acrylate (2-hydroxypropyl acrylate) Me Acrylate (2-HPMA), methyl methacrylate (MMA), methyl acrylate (MA), methacrylic acid (MAA), ethyl methacrylate (EMA), ethyl acrylate (EA) (BMA), isobutyl methacrylate (IBMA), t-butyl methacrylate (TBMA), 2-ethylhexyl methacrylate (EHMA), benzyl methacrylate (BMA), glycidyl methacrylate GMA), N, N-dimethylacrylamide (DMAA), acrylonylmorpholine (ACMO), dipentaerythritol nuclear acrylate (DPHA), dipentaerythritol pentaacrylate (DPPA), pentaerythritol tetraacrylate (PETTA), pentaerythritol tetraacrylate (PETTA) ethylene oxide adduct derivative, pentaerythritol triacrylate (PETA), tri (2-hydroxyethyl) isoanoate triacrylate (THIC), trimethylpropanetriacryl (TMPTA), trimethylpropane tri Acrylate (TMPTA) ethylene oxide adduct type derivatives, trimethylpropane triacrylate (TMPTMA), trimethylpropane trimethyl acrylate (TMPTMA) ethylene oxide addition type derivatives, tris-2-hydroxyethylisocyanurate triacrylate (THEITA) Triethylene glycol diacrylate (TPGDA), tripropylene glycol diacrylate (TPGDA) ethylene oxide adduct derivative, 1,4-butanediol diacrylate (BDDA), 1,6-hexanediol diacrylate (HDDA) (PEGDMA), polypropylene glycol diacrylate (PPGDA), polypropylene glycol dimethacrylate (PEGDMA), poly (ethylene glycol diacrylate) PPGDMA), cyclohexanedimethanol diacrylate (CHDMDA), dicyclodecane dimethanol diacrylate (DCDDMDA), bisphenol A diacrylate (B ADA) ethylene oxide addition type derivatives, bisphenol A dimethacrylate (BADMA) ethylene oxide addition type derivatives, or any mixture thereof.

In the present invention, the photoinitiator is not particularly limited, and any of the photoinitiators generally used in the art can be arbitrarily selected and used.

The photoinitiator may include a hydroxyketone photoinitiator, an amino ketone photoinitiator, a phenylglyoxylate photoinitiator, a benzyldimethylketal photoinitiator, or a phosphine photoinitiator, and more specifically, 1-hydroxycyclohexyl phenyl ketone Methyl-1-propane, 2-hydroxy-1- [4- (2-hydroxyethoxy) phenyl] 2-phenyl-acetoxy-ethoxy] -ethyl ester and oxy-phenyl-acetic acid 2- [2-hydroxy-ethoxy] Ethyl ester, a mixture of alpha-alpha-alpha-dimethoxy-alpha-phenylacetophenone, 2-benzoyl- 2- (dimethylamino) -1- [4- (4- (2,4,6-trimethylbenzoyl) -phosphine oxide, phosphine (2-methyl-1- [4- (methylthio) phenyl] -2- Oxide phenylbis (2,4,6-trimethylbenzoyl), bis (4-methylphenyl) ethylidene-bis (2,6-difluoro-3- (1-ethyl- (2-methylpropyl) phenyl] -hexafluorophosphate, diphenyl ketone benzyl dimethyl ketal, 4-hydroxycyclophenyl ketone, dimethoxy-2-phenyl aetetophenone, anthraquinone, fluorene, triphenyl Amines, carbazoles, 3-methylacetophenone, 4-quinolone acetophenone, 4,4-dimethoxyacetophenone, 4,4-diaminobenzophenone, or any mixture thereof may be appropriately selected and used.

The photoinitiator is preferably contained in an amount of 0.01 to 10% by weight based on the total weight of the composition. If the content of the photoinitiator is less than 0.01% by weight, the curing rate may be too slow, and if it is more than 10% by weight, yellowing may occur.

On the other hand, examples of the solvent include alcohols (such as methanol, ethanol, isopropanol, 2-methoxyethanol, butanol, isooctanol, methylcellulose, ethylsulosorb, isopropylcellosolve, butylcellosolve, methylcarbitol, (Acetone, methyl ethyl ketone, methyl butyl ketone, methyl isobutyl ketone, diethyl ketone, dipropyl ketone, dibutyl ketone, cyclohexanone and the like), ethers Any one selected from benzene (benzene, toluene, xylene, etc.), or any mixture thereof may be used as the organic solvent (for example, methyl acetate, ethyl acetate, butyl acetate), hexane (hexane, heptane, .

The solvent constitutes the balance with respect to the total weight of the composition, but generally 0 to 80% by weight, usually 0 to 70% by weight, may be included. If the content of the solvent is 0 wt% or less, the solvent-free photocurable coating agent may be prepared. If the amount of the solvent exceeds 80 wt%, the drying may be too slow, resulting in poor productivity. It may be undesirable because the coating agent must be applied and the viscosity becomes too low to cause problems in the formation of the imprinting pattern.

In the photocurable imprinting composition according to the present invention, additives may be optionally added as needed. The additive may be present in an amount of 0.001 to 5% by weight, based on the total weight of the composition, of an antioxidant, a UV absorber, a light stabilizer, a thermal polymerization inhibitor, a leveling agent, a surfactant, a lubricant, an antifouling agent, But it is not limited to and is optional in the present invention. In particular, in order to impart releasability to a soft mold, a silicone-based releasing agent, a fluorine-based acrylate monomer for imparting antifouling properties, and a silicone leveling agent for imparting leveling properties can be added within the range not hindering the effect of the present invention.

The photocurable imprinting composition according to the present invention has a viscosity of 5 to 3,000 cps and a refractive index of 1.45 to 1.55, preferably 1.47 to 1.51. If the viscosity of the photocurable coating composition is less than 5 cps, the coating thickness becomes too thin to cause a problem with the imprinting pattern. If the viscosity exceeds 3,000 cps, the viscosity becomes too high to lower the workability and the coating thickness becomes too thick. Further, when the refractive index is 1.47 to 1.51, it is preferable since it can realize the most ideal optical characteristics.

According to an embodiment of the present invention, there is provided a light guide plate (LGP) including a patterned coating layer by photocuring imprinting the photocurable imprinting composition of the present invention on one side or both sides of a substrate.

In the present invention, the substrate is not particularly limited but is preferably a transparent material such as polymethylacrylate (PMMA), polycarbonate (PC), or polyethyl terephthalate (PET) A photocurable imprinting coating can be applied on at least one side of the substrate.

The thickness of the imprinting coating layer is in the range of 1 to 100 탆, preferably in the range of 1 to 70 탆, more preferably in the range of 5 to 50 탆.

The photocurable imprinting composition according to the present invention is cured instantly by irradiating UV light after coating. The amount of UV light to be irradiated is about 0.01 to 2 J / cm ² , preferably 0.1 to 1 J / cm ² , Is 0.2 to 0.5 J / cm ² , and the wavelength is preferably 365 nm as the dominant wavelength.

The light guide plate manufactured as described above is excellent in productivity due to a high rate of pattern formation and curing at the time of manufacture and is capable of thin film imprinting coating. The light guide plate manufactured after curing has excellent yellowing resistance, Has excellent brightness and light transmittance, and exhibits excellent adhesion, hardness and scratch resistance.

According to an embodiment of the present invention, there is provided a backlight unit including the light guide plate.

The backlight unit is not limited and a structure known in the art may be employed. For example, a light source (CCFL or LED), a reflection sheet, a light guide panel (LGP), a diffusion sheet, a prism sheet, and a protection sheet.

According to an embodiment of the present invention, there is provided a liquid crystal display device including the light guide plate. Preferably, the liquid crystal display device may include the backlight unit having the light guide plate according to the present invention.

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples, but it should be understood that the present invention is not limited thereto.

≪ Examples 1 to 20 and Comparative Examples 1 to 20 >

The photocurable imprinting compositions were prepared by combining the respective components at the composition ratios and composition ratios shown in Tables 1, 2, 3, and 4 below, and their physical properties were evaluated according to the following evaluation methods, Are shown in Tables 1, 2, 3 and 4 below.

ingredient Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 IR H70 9 9 9 9 9 IR G304 9.5 9.5 9.5 9.5 9.5 I-335 2 2 2 2 2 1.5 1.5 1.5 1.5 1.5 X-22-2475 2 2 2 2 X-22-9002 2 2 2 2 2 2 SC2153 4 4 4 4 CN294E 4 4 CN104NS 4 4 Ebecryl 1710 4 4 PETA 20 TMPTA 20 HDDA 20 EOEOEA 20 THFA 20 NVP 20 IBOA 20 IBMA 20 HEMA 20 GMA 20 I-907 3 3 3 3 3 3 I-184 3 3 3 3 MEK 30 30 30 30 30 30 30 30 30 30 Acetone 30 30 30 30 30 30 30 30 30 30 Sum 100 100 100 100 100 100 100 100 100 100 Viscosity (cps, @ 25 ℃) 25 20 15 15 13 13 13 15 15 15 AHPA color 10 10 10 7 3 5 3 3 3 3 Light quantity (mJ) 300 300 300 300 300 300 300 300 300 300 Imprinting pattern Extremely
Great Extremely
Great Extremely
Great Extremely
Great Extremely
Great Extremely
Great Extremely
Great Extremely
Great Extremely
Great Extremely
Great Decrease in luminance
(laser
Pattern light guide plate) equal equal equal equal equal equal equal equal equal equal Decrease in light transmittance (%) 0.27 0.23 0.31 0.28 0.19 0.24 0.29 0.26 0.23 0.32 Low-temperature thermal shock More than
none More than
none More than
none More than
none More than
none More than
none More than
none More than
none More than
none More than
none Color deviation (compared to laser pattern light guide plate) equal equal equal equal equal equal equal equal equal equal Pencil Hardness (H) 3 3 3 2 2 3 3 2 3 2 Adhesive force (n / 100) 100 /
100 100 /
100 100 /
100 100 /
100 100 /
100 100 /
100 100 /
100 100 /
100 100 /
100 100 /
100 Assessment of transition Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass

ingredient Example 11 Example 12 Example 13 Example 14 Example 15 Example 16 Example 17 Example 18 Example 19 Example 20 IR H70 19 19 19 19 19 IR G304 20 20 20 20 20 I-335 4 4 4 4 4 3 3 3 3 3 X-22-2475 4 4 4 4 X-22-9002 4 4 4 4 4 4 SC2153 8 8 8 8 CN294E 8 8 CN104NS 8 8 Ebecryl 1710 8 8 PETA 20 TMPTA 20 HDDA 60 EOEOEA 60 THFA 60 NVP 60 IBOA 40 60 IBMA 40 60 HEMA 60 GMA 60 I-907 5 5 5 5 5 5 I-184 5 5 5 5 MEK Acetone Sum 100 100 100 100 100 100 100 100 100 100 Viscosity (cps, @ 25 ℃) 591 376 275 253 187 174 191 236 301 324 AHPA color 12 12 13 10 5 7 6 5 7 6 Light quantity (mJ) 300 300 300 300 300 300 300 300 300 300 Imprinting pattern Extremely
Great Extremely
Great Extremely
Great Extremely
Great Extremely
Great Extremely
Great Extremely
Great Extremely
Great Extremely
Great Extremely
Great Luminance (Laser
Pattern light guide plate) equal equal equal equal equal equal equal equal equal equal Decrease in light transmittance (%) 0.25 0.32 0.36 0.29 0.18 0.23 0.27 0.25 0.26 0.22 Low-temperature thermal shock More than
none More than
none More than
none More than
none More than
none More than
none More than
none More than
none More than
none More than
none Color deviation (compared to laser pattern light guide plate) equal equal equal equal equal equal equal equal equal equal Pencil Hardness (H) 2 2 One One 2 2 2 One 2 One Adhesive force (n / 100) 100 /
100 100 /
100 100 /
100 100 /
100 100 /
100 100 /
100 100 /
100 100 /
100 100 /
100 100 /
100 Assessment of transition Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass

ingredient Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 IR H70 9 9 19 9 IR G304 4 11 9.5 9.5 19.5 I-335 2 2 2 2 2 1.5 1.5 1.5 1.5 X-22-2475 2 2 2 X-22-9002 2 2 2 2 2 SC2153 4 4 4 4 CN294E 6 CN104NS 14 Ebecryl 1710 4 14 PETA 20 TMPTA 20 HDDA 20 9.5 4 EOEOEA 9 2 THFA 23 NVP 20 IBOA 20 IBMA 20 HEMA 20 GMA I-907 3 3 3 3 3 I-184 3 3 3 3 MEK 30 30 30 30 30 30 30 30 30 30 Acetone 30 30 30 30 30 30 30 30 30 30 Sum 100 100 100 100 100 100 100 100 100 100 Viscosity (cps, @ 25 ℃) 8 18 25 55 13 5 11 14 12 61 AHPA color 5 9 8 5 3 5 3 3 3 3 Light quantity (mJ) 350 300 300 300 Hardening
No 350 300 300 300 300 Imprinting pattern Great Bad Great Great Measure
Impossible Great Bad Bad Great Great Luminance (Laser
Pattern light guide plate) decrease decrease decrease decrease Measure
Impossible decrease decrease decrease decrease decrease Decrease in light transmittance (%) 0.57 0.86 0.36 0.76 Measure
Impossible 0.64 0.56 0.38 0.86 0.62 Low-temperature thermal shock More than
none More than
none More than
none More than
none Measure
Impossible Bad More than
none More than
none More than
none More than
none Color deviation (laser
Pattern light guide plate) Poor equal Poor Poor Measure
Impossible Poor equal equal Poor Poor Pencil Hardness (H) 3 3 2 2 Measure
Impossible One 2 2 2 2 Adhesive force (n / 100) 68/100 100 /
100 100 /
100 100 /
100 Measure
Impossible 0/100 97/100 100 /
100 100 /
100 100 /
100 Assessment of transition Bad Pass Pass Bad Measure
Impossible Bad Pass Pass Pass Bad

ingredient Comparative Example 11 Comparative Example 12 Comparative Example 13 Comparative Example 14 Comparative Example 15 Comparative Example 16 Comparative Example 17 Comparative Example 18 Comparative Example 19 Comparative Example 20 IR H70 19 19 19 29 IR G304 20 20 20 30 I-335 4 4 4 4 3 3 3 3 X-22-2475 4 4 4 4 X-22-9002 4 4 4 4 SC2153 8 8 8 8 CN294E 8 8 CN104NS Ebecryl 1710 18 18 PETA 20 TMPTA 20 HDDA 64 EOEOEA 68 THFA 40 20 NVP 60 IBOA 59 63 IBMA 44 64 HEMA 68 GMA 40 I-907 5 5 5 5 5 5 I-184 5 5 5 5 MEK Acetone Sum 100 100 100 100 100 100 100 100 100 100 Viscosity (cps, @ 25 ℃) 81 125 240 212 573 54 104 228 301 794 AHPA color 7 10 12 9 8 6 5 5 7 6 Light quantity (mJ) 450 300 300 300 300 300 300 300 300 300 Imprinting pattern Great Bad Bad Bad Bad Great Bad Bad Bad Bad Luminance (Laser
Pattern light guide plate) decrease decrease decrease decrease decrease decrease decrease decrease decrease decrease Decrease in light transmittance (%) 0.48 0.65 0.36 0.53 0.62 0.34 0.46 0.53 0.70 0.47 Low-temperature thermal shock Bad More than
none Bad More than
none More than
none Bad More than
none More than
none Bad Bad Color deviation (laser
Pattern light guide plate) Bad Bad Bad Bad Bad Bad Bad Bad Bad Bad Pencil Hardness (H) One 2 One One 3 One 2 One One One Adhesive force (n / 100) 43/100 90/100 100 /
100 96/100 100 /
100 37/100 86/100 100 /
100 100 /
100 100 /
100 Assessment of transition Bad Bad Pass Pass Bad Bad Bad Pass Pass Pass

IR H70: (meth) acrylate copolymer (Mitsubishi Rayon)

IR G304: (meth) acrylate copolymer (Mitsubishi Rayon)

I-335: Phenyl acrylate / methyl acrylate copolymer (Ashland)

X-22-2475: Silicone compound (Shin Echu)

X-22-9002: Silicone compound (Shin et al.)

SC2153: aliphatic urethane acrylate oligomer (10-functional group, MWC)

CN294E: Polyester acrylate oligomer (4-functional group, satomer)

CN104NS: Epoxy acrylate oligomer (bifunctional group, satomer)

Ebecryl 1710: Acrylic acrylate oligomer (26,000 cps @ 25 캜, SKK Cytec)

PETA: pentaerythritol triacrylate (3-functional group, SK-Cytec)

TMPTA: trimethylpropane triacrylate (3-functional group, MWCM)

HDDA: 1,6-hexanediol diacrylate (2-functional group, Kunshan Corp.)

EOEOEA: ethoxyethoxyethyl acrylate (monofunctional, enrichment)

THFA: tetrahydrofuryl acrylate (monofunctional group, MWCM)

NVP: N-vinyl-2-pyrrolidone (monofunctional group, BASF)

IBOA: isobornyl acrylate (monofunctional group, COEICA)

IBMA: isobutyl methacrylate (monofunctional group, Coeisha)

HEMA: 2-hydroxyethyl methacrylate (monofunctional group, Kunshan Corp.)

GMA: glycidyl methacrylate (monofunctional, Momentive)

I-907: 2-methyl-1- [4- (methylthio) phenyl] -2- (4-morpholinyl)

I-184: 1-hydroxycyclohexyl phenyl ketone (Ciba Geigy)

MEK: Methyl ethyl ketone (purified water)

Acetone: Acetone (purified water)

Viscosity: The viscosity (cps, 25) of the photocurable imprinting composition was measured using a viscometer according to KS A 0531.

 -. Color (APHA Color): The color of the photocurable imprinting composition (APHA Color) was measured using a spectrophotometer according to KS M ISO 6271-2.

 -. Light quantity (mJ): The light quantity for curing of the photocurable imprinting composition was measured using a UV-Puck II UVICURE (EIT) photometer.

 -. Imprinting Pattern: Pattern shape, releasability and cracking were observed and evaluated with a micro-microscope (Nikon Corporation).

 -. Illuminance: The luminance of the pattern light guide plate and the laser pattern light guide plate by the photocurable imprinting composition is measured according to KS C IEC 61988-2-1, and the luminance difference between the laser pattern light guide plate (reference) and the imprinting pattern light guide plate is calculated , And when the luminance of the imprinting light guide plate is 5% or more lower than that of the laser pattern light guide plate (reference), it is determined to be decreased.

 -. Light Transmittance Degradation: The light transmittance of the pattern light guide plate by the photocurable imprinting composition was measured using a light transmittance measuring device according to KS M ISO 13468-1 (ASTM D1003, JIS K 7361) The difference in light transmittance between the light guide plate and the light guide plate after imprinting was calculated, and the light transmittance decrease value was converted to%. (I.e., the light transmittance value (%) = (light transmittance value before imprinting - light transmittance value after imprinting) / (light transmittance value before imprinting) x 100).

 -. Low temperature thermal shock: The low temperature thermal shock test of the patterned light guide plate by the photocurable imprinting composition was evaluated using the test method according to KS M 5999: 2012. The measurement was carried out at room temperature (23 ° C) through 35 ° C, 55 ° C and 75 ° C, to 85 ° C, again to 85 ° C, 75 ° C, 55 ° C and 35 ° C, For 1 hour, and for 2 hours for temperature. The final test was carried out by evaluating the appearance of each test plate against adherence peeling, bulging, cracking, flaking, whitening, scratches, etc., and judging it as abnormal and defective.

 -. Color Deviation: The color deviation value of the pattern light guide plate by the photocurable imprinting composition is determined to be equal to or less than 0.1% based on the color deviation value of the laser pattern light guide plate, and when the difference in color deviation value is within ± 0.1% It was judged to be defective. In this case, the color deviation measurement area is obtained by arbitrarily selecting 17 points of the light entrance part, the center and the entry / exit part of the light guide plate, and the average value of the measured 17 color coordinates is calculated to calculate the difference Respectively.

 -. Pencil Hardness: The pencil hardness of the pattern light guide plate by the photocurable imprinting composition was measured by using a pencil hardness tester to measure the reference pencil HB, H, 2H, 3H, 4H, etc. on the surface of the test light guide plate After applying a load of 500 grams, scratch test was repeated 5 times. The pencil hardness value was determined by measuring the number of marks on the applied load.

 -. Adhesion Test: The adhesion of the patterned light guide plate by the photocurable imprinting coating composition was measured by the method according to KS M ISO 2409: 2013. The prepared light guide plate was cut into 100 matrix structures in an area of 10 x 10 mm, and the number of matrices separated from each other by adhesive bonding and vertically strong releasing was indicated on the light guide plate (i.e., adhesion force = (100 - Number of matrices derived) / 100).

-. Impression pattern: Imprinting pattern A SET was constructed so that the coated surface of the light guide plate and the non-printed surface of the PET (PET) contacted (width = 10 mm x 10 mm), and weights of 300, 400, 500, 600 and 800 grams Five were placed on cubic beads. Then, aging was carried out at a temperature of 50 ° C and a humidity of 60% for 24 hours. After the test, the plate was allowed to stand at room temperature (23 ° C) for 1 hour, and then the reflector / light guide plate was separated, and the transition and collapse were visually confirmed. In the absence of metastasis and collapse, a pass determination was made, and if there was metastasis and / or collapse, it was determined to be defective.

Table 1 and Table 3 show the results of the respective examples and comparative examples of the solvent type imprinting composition containing the solvent, and Table 2 and Table 4 show the results of the examples of each of the solventless imprinting composition And the experimental results of the comparative example are shown.

As shown in Tables 1, 2, 3 and 4, the (meth) acrylate polymer of Formula 1 and the silicone compound of Formula 2, the polyfunctional acrylate oligomer, the acrylate In Examples 1 to 20 including both a monomer and a photoinitiator, the imprinting pattern was excellent as compared with Comparative Examples 1 to 20, and the color was transparent, the color deviation was small, and the luminance, the light transmittance, the pencil hardness And adherence were good, and it was confirmed that there was no abnormality in the evaluation of transitivity and low temperature thermal shock.

On the other hand, in the case of the composition excluding the multifunctional (meth) acrylate polymer of the formula (1) in Comparative Examples 1, 6, 11, 12 and 16, the light transmittance and brightness were lowered, color deviation was increased, It was confirmed that the transition test failed.

In Comparative Examples 2, 8, 13, and 18, in the case of the composition excluding the silicone of the formula (2), imprinting pattern defects occurred, brightness deteriorated, and color deviation became large. As the pattern was poor, it was confirmed that the problem on the uniformity affected the luminance and color deviation.

In the case of the composition excluding the polyfunctional acrylate oligomer as in Comparative Examples 3, 9, 14 and 19, imprinting pattern defects were observed, pencil hardness was lowered, brightness and light transmittance were lowered and color deviation was increased .

In the case of the composition excluding the photosetting agent in Comparative Example 5, the photo-curing was not performed and the imprinting pattern light guide plate could not be formed.

In Comparative Examples 4 and 10 in the case of the solvent type imprinting composition test, in the case of the composition excluding the acrylate monomer, the viscosity was greatly increased to cause problems in workability, color deviation was increased, and brightness and light transmittance were lowered.

In the case of the compositions for imprinting imprinting compositions of Comparative Examples 15 and 20, even in the case of a composition in which the acrylate monomer was largely reduced, the viscosity was greatly increased, causing problems in workability, increasing color variation, lowering brightness and light transmittance, Failure also occurred in the test.

Claims (13)

(Meth) acrylate polymer of the following formula (1), 0.01 to 10% by weight of a silicone compound of the following formula (2), 0.01 to 50% by weight of a polyfunctional acrylate oligomer, 5 to 80% by weight of an acrylate monomer, 0.1 To 10% by weight, and balance of a solvent: a viscosity of 5 to 3,000 cps, and a refractive index of 1.45 to 1.55.
(Formula 1)

Wherein R ₁ and R ₃ are each independently hydrogen (H-) or methyl (CH ₃ -), R ₂ and R ₄ are each independently hydrogen (H-), methyl (CH ₃ -), A linear aliphatic hydrocarbon, a branched aliphatic hydrocarbon, a cyclic aliphatic hydrocarbon, a polyethylene glycol, or a polypropylene glycol group, n and m are each independently an integer larger than 1, and 10? n + m?
(2)

(Wherein R ₁ is selected from the group consisting of a methyl group (CH ₃ -), an amino group, an epoxy group, an alicyclic epoxy group, a (meth) acryl- R ₂ is selected from the group consisting of methyl (CH ₃ -), phenyl-, linear (aliphatic), linear (aliphatic) aliphatic hydrocarbon, a branched aliphatic hydrocarbon, a cyclic aliphatic hydrocarbon, polyethylene glycol, or polypropylene glycol, n and m are each independently an integer greater than 0 , 10? N + m? 100). The composition of claim 1, wherein said multifunctional acrylate oligomer is selected from the group consisting of an aliphatic urethane acrylate oligomer, an aromatic urethane acrylate oligomer, a polyester acrylate oligomer, an epoxy acrylate oligomer, an acrylic acrylate oligomer, And at least one oligomer, wherein the photocurable imprinting composition is for forming a light guide plate fine pattern. The composition of claim 1, wherein the acrylate monomer is selected from the group consisting of ethoxyethoxyethyl acrylate (EOEOEA), ethoxy triethylene glycol methacrylate (ETEGMA), phenoxy ethyl acrylate (PEA), 4-cumyl phenoxyethyl Acrylate (CPEA), O-phenylphenoxyethyl acrylate (PPEA), 2-hydroxy-3-phenoxypropyl acrylate (HPPA), tetrahydrofuryl acrylate (THFA), cyclic trimethylolpropane foam acryl (CTMPFA), polyethylene glycol monoacrylate (PEGMA), polyethylene glycol monomethacrylate (PEGMMA), polyalkylene glycol monomethacrylate (PAGMMA), polypropylene glycol monomethacrylate (PPGMMA), isobornyl acrylate (IBAA), isobonyl methacrylate (IBOMA), 2-hydroxyethyl acrylate (HEA), 2-hydroxymethacrylate (HEMA), 2-hydroxypropyl acrylate - hydroxypropyl (Meth) acrylic acid (MAA), ethyl methacrylate (EMA), ethyl acrylate (EA), n-butyl methacrylate (MMA) Acrylate (BMA), isobutyl methacrylate (IBMA), t-butyl methacrylate (TBMA), 2-ethylhexyl methacrylate (EHMA), benzyl methacrylate (BMA), glycidyl methacrylate (GMA), N, N-dimethylacrylamide (DMAA), acrylonylmorpholine (ACMO), dipentaerythritol nuclear acrylate (DPHA), dipentaerythritol pentaacrylate (DPPA), pentaerythritol tetraacryl (PETTA), pentaerythritol tetraacrylate (PETTA) ethylene oxide adduct derivative, pentaerythritol triacrylate (PETA), tri (2-hydroxyethyl) isoanoate triacrylate (THEIC), trimethylpropane tri Acrylate (TMPTA), trimethylpropane Acrylate (TMPTA) ethylene oxide addition type derivatives, trimethylpropane triacrylate (TMPTMA), trimethylpropane trimethyl acrylate (TMPTMA) ethylene oxide addition type derivatives, tris-2-hydroxyethylisocyanurate triacrylate (THEITA) Triethylene glycol diacrylate (TPGDA), tripropylene glycol diacrylate (TPGDA) ethylene oxide adduct derivative, 1,4-butanediol diacrylate (BDDA), 1,6-hexanediol diacrylate (HDDA) (PEGDMA), polypropylene glycol diacrylate (PPGDA), polypropylene glycol dimethacrylate (PEGDMA), poly (ethylene glycol diacrylate) PPGDMA), cyclohexanedimethanol diacrylate (CHDMDA), dicyclodecane dimethanol diacrylate (DCDDMDA), bisphenol A diacrylate (BADA) ethylene oxide addition-type derivatives of bisphenol A di-methacrylate (BADMA) sight for ethylene oxide, at least one light guide plate of a fine pattern of monomer species selected from the group (群) made of addition type derivatives formed burned imprinting composition. The photocurable imprinting composition of claim 1, wherein the photoinitiator is a hydroxyketone photoinitiator, an amino ketone photoinitiator, a phenylglyoxylate photoinitiator, a benzyldimethylketal photoinitiator, or a phosphine photoinitiator, . 5. The composition of claim 4 wherein said photoinitiator is selected from the group consisting of 1-hydroxycyclohexyl phenyl ketone, benzophenone, 2-hydroxy-2-methyl-1-phenyl- (2-oxo-2-phenyl-acetoxy-ethoxy) -ethyl ester, Alpha-dimethoxy-alpha-phenylacetophenone, 2-benzoyl-2- (dimethylamino) -1- Methyl-1- [4- (methylthio) phenyl] -2- (4-morpholinyl) -1-propanone, diphenyl (2,4,6-trimethylbenzonyl) -phosphine oxide, phosphine oxide phenylbis (2,4,6-trimethylbenzonyl), bis (eta 5-2,4-cyclopentadien- (4-methylphenyl) [4- (2-methylpropyl) phenyl] -hexafluorophosphate < / RTI > , Di Ketone benzoyl dimethyl ketal, 4-hydroxycyclophenyl ketone, dimethoxy-2-phenylactetophenone, anthraquinone, fluorene, triphenylamine, carbazole, 3-methylacetophenone, , 4-dimethoxyacetophenone, and 4, 4-diaminobenzophenone. The photocurable imprinting composition for forming a light guide plate fine pattern according to claim 1, wherein the photocurable imprinting composition is at least one photoinitiator selected from the group consisting of 4,4'- The photocurable imprinting composition according to claim 1, wherein the solvent is an alcohol-based, ketone-based, ether-based, hexane-based or benzyl-based solvent. The method according to claim 6, wherein the solvent is selected from the group consisting of methanol, ethanol, isopropanol, 2-methoxyethanol, butanol, isooctanol, methylcellulose, ethylsulosorb, isopropylcellosolve, butylcellosolve, methylcarbitol, ethyl Methyl ethyl ketone, methyl isobutyl ketone, diethyl ketone, dipropyl ketone, dibutyl ketone, cyclohexanone, methyl acetate, ethyl acetate, butyl Wherein the solvent is at least one solvent selected from the group consisting of acetone, hexane, heptane, octane, benzene, toluene and xylene. The photocurable imprinting composition of claim 1, wherein the photocurable imprinting composition comprises an antioxidant, a UV absorber, a light stabilizer, a thermal polymerization inhibitor, a leveling agent, a surfactant, a lubricant, an antifouling agent or a release agent in an amount of 0.001 to 5 wt% % By weight based on the total weight of the light guide plate. delete A light guide plate (LGP) including a patterned coating layer by imprinting a photocurable imprinting composition for forming a light guide plate fine pattern according to any one of claims 1 to 8 on at least one side of a substrate, Panel). 11. The light guide plate according to claim 10, wherein the imprinting coating layer has a thickness of 1 to 100 mu m and a fine pattern is formed on the surface. A backlight unit (BLU) including the light guide plate according to claim 11. A liquid crystal display device comprising the backlight unit according to claim 12.