KR101794292B1 - Optical sheet having improved heat resistance and preparation method thereof - Google Patents
Optical sheet having improved heat resistance and preparation method thereof Download PDFInfo
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- KR101794292B1 KR101794292B1 KR1020150164979A KR20150164979A KR101794292B1 KR 101794292 B1 KR101794292 B1 KR 101794292B1 KR 1020150164979 A KR1020150164979 A KR 1020150164979A KR 20150164979 A KR20150164979 A KR 20150164979A KR 101794292 B1 KR101794292 B1 KR 101794292B1
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- 0 CC(C)(C)O[S@](C(C)(C)C)(O*)OC(N**)=O Chemical compound CC(C)(C)O[S@](C(C)(C)C)(O*)OC(N**)=O 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0025—Diffusing sheet or layer; Prismatic sheet or layer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
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Abstract
Since the optical sheet of the present invention has a back coating layer including a phenyl silicone resin having a phenyl silicone repeating unit and a silicone repeating unit bonded to a diisocyanate or the like, it is possible to prevent the optical sheet from being deformed due to wrinkles, . Accordingly, the backlight unit including the optical sheet has little deterioration in quality due to heat and has excellent durability, so that the brightness, image quality, and life of the liquid crystal display using the backlight unit can be improved.
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical sheet such as a prism sheet or a diffusion sheet which can be used for a backlight unit (BLU) of a liquid crystal display (LCD), and more particularly to an optical sheet such as a sheet wrinkle, Which is excellent in heat resistance.
Since a liquid crystal display (LCD) widely used as a flat panel display is a light-receiving device that displays an image by adjusting the amount of light coming from the outside, a backlight source form A backlight unit (BLU) is required. A backlight unit is a device that can display information by supplying a lamp light to an LCD that can not emit light by itself, and is called a backlight unit on the back side of the LCD.
Since the compact fluorescent lamp or the LED is a line light source or a point light source, the backlight unit may use a small fluorescent lamp or a light emitting diode (LED) A reflection sheet, a diffusing sheet, a prism sheet, or the like, and is used in the form of a surface light source. Among them, the light guide plate converts light incident from the light source into uniform plane light, and the reflection sheet serves to reflect light emitted from the lower portion of the light guide plate back to the light guide plate to minimize light loss.
In particular, unlike other light sources, a light source used for a backlight unit converts about 70% to 80% or more of the input power into thermal energy, so that the optical sheet such as a diffusion sheet or a prism sheet adjacent to a light source or a light- which causes a wave. Such deformation of the optical sheet may cause unevenness of the LCD screen, lowered luminance, and shortened life span. Particularly, recently used notebook PCs and tablets / mobile devices employ very thin LCD panels, and the optical sheets used therein are becoming more and more deformed due to high temperature.
In order to solve this problem, conventionally, the thickness of the optical sheet has been increased or hard coating or UV coating has been performed on one or both sides of the base layer of the optical sheet. Or deformation of the optical sheet by heat has been attempted to be solved through a design change of a backlight unit or the like.
The inventors of the present invention have found that the above problems can be solved by improving the heat resistance of the back coating layer of the optical sheet while manufacturing the same in the same manner as the conventional optical sheet for a backlight unit.
The present invention provides an optical sheet having excellent heat resistance and minimized deformation due to heat. The present invention also provides a method for producing the optical sheet. The present invention also provides a backlight unit including the optical sheet.
The present invention relates to a substrate layer; An optical functional layer disposed on one surface of the substrate layer; And a rear coating layer disposed on the other side of the substrate layer, wherein the rear coating layer comprises a first repeating unit represented by the following formula (1) and a second repeating unit represented by the following formula (2) The present invention provides an optical sheet comprising:
[Chemical Formula 1] < EMI ID =
Wherein R 1 is C 1-6 alkyl,
Wherein R 2 is C 1-6 alkyl; R 3 is -NCO or
(1) forming an optical functional layer on one surface of a base layer; And (2) coating the other surface of the base layer with a phenyl silicone resin composition to form a back coating layer, wherein the phenyl silicone resin composition comprises a first repeating unit represented by Formula 1 and a second repeating unit represented by Formula 2 And a phenyl silicone resin having a second repeating unit.
The present invention also provides a backlight unit including a light guide plate, a light source disposed adjacent to the light guide plate, and the optical sheet disposed on one side or both sides of the light guide plate.
The optical sheet is improved in heat resistance by a back coating layer including a phenylsilicone resin, and can be prevented from being deformed due to heat generated by wrinkles or scratches.
Accordingly, the backlight unit including the optical sheet has little deterioration in quality due to heat and has excellent durability, so that the brightness, image quality, and life of the liquid crystal display using the backlight unit can be improved.
In addition, the phenylsilicone resin is excellent in heat resistance, and the rear coat layer formed using the phenylsilicone resin is prevented from being shrunk with the adjacent layer, so that an additional coating process is unnecessary, and thus the processability is improved.
Figures 1 and 2 illustrate examples of cross sections of an optical sheet according to the present invention.
Hereinafter, the present invention will be described in more detail with reference to the drawings.
1 and 2, the
Hereinafter, each layer will be described in detail.
The
The base layer may include a polyester resin, an acrylic resin, a polycarbonate resin, a polyolefin resin, an epoxy resin, a polyvinyl chloride resin, an acrylamide resin, or a mixed resin thereof.
Specifically, the substrate layer may be formed of a material selected from the group consisting of polyether sulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate terephthalate (PET), polyphenylene sulfide (PPS), polyallylate, polyimide, polycarbonate (PC), cellulose triacetate (TAC), cellulose acetate propionate propionate, CAP) or a mixed resin thereof.
As a specific example, the base layer may include a polyethylene terephthalate (PET) resin. For example, the substrate layer may be a transparent PET resin layer or a white PET resin layer.
The base layer may have a thickness in the range of 20 to 350 占 퐉, a range of 50 to 350 占 퐉, or a range of 100 to 350 占 퐉.
The
The optically functional layer may be, for example, a
The prism pattern layer and the diffusion bead layer may be composed of a conventional prism pattern layer or a diffusion bead layer.
For example, the prism pattern layer may include a prism lens pattern. The prism lens pattern may have an asymmetric prism or a double prism shape. The apex angle (? In Fig. 1) of the prism lens pattern may be 70 deg. &Amp;thetas; &le; 110 deg.
The diffusion bead layer may include a polymer resin and diffusion beads dispersed in the polymer resin. The diffusion beads may include a polymer resin selected from hard acrylate, polystyrene, nylon, soft acrylate and silicone. Of these, hard acrylate having good solvent resistance and easy dispersion is preferable. The diffusion beads are preferably spherical, and may have an average particle size of 0.5 to 5 mu m, preferably 0.8 to 3 mu m. It is preferable that the refractive index of the diffusion bead is different from the refractive index of the photocurable resin by 0.02 or more. The diffusion beads may be used in an amount of 30 to 180 parts by weight, preferably 50 to 150 parts by weight, based on 100 parts by weight of the polymer resin contained in the diffusion bead layer.
Also, although not shown in the drawings, the optically functional layer may be a reflective layer. When the optical function layer is a reflective layer, the optical sheet may be disposed on a lower surface of the backlight unit and used as a reflective sheet. The reflective layer may contain a metal or metal oxide component.
The
The
The phenylsilicone resin includes a first repeating unit represented by the following formula (1) and a second repeating unit represented by the following formula (2).
[Chemical Formula 1] < EMI ID =
Wherein R 1 is C 1-6 alkyl,
In the formula (2)
R 2 is C 1-6 alkyl; R 3 is -NCO or
Specifically, the C 6-10 carbocycle may be a cyclohexane ring or a benzene ring, and each of R 1 and R 2 may be methyl.
Since the phenyl silicone resin contains a diisocyanate block as shown in Formula 2, it can be further improved in terms of heat resistance, flexibility and hardness of the coating film.
As an example, the second repeating unit may be represented by the following formula (2a):
(2a)
In the formula (2a), R 2 , A and B are as defined in the above formula (2).
As a specific example, A is
When the phenylsilicone resin includes a methacrylate block as shown in Formula 2a, it can be further improved in UV curing property, heat resistance and mechanical properties.
The first and second repeating units may be contained in the phenylsilicone resin in a specific ratio. For example, the second repeating unit may be contained in the polymer resin at a molar ratio of 1 to 1.5 (second repeating unit / first repeating unit) to the first repeating unit.
More specifically, the molar ratio (second repeating unit / first repeating unit) may be 0.8 to 1.2. When the molar ratio is within the above range , stable synthesis and heat resistance characteristics can be enhanced.
The refractive index of the phenylsilicone resin may be 1.4 to 1.7, more specifically 1.5 to 1.6. When the refractive index is within the above range, the Tg is high, which is advantageous in terms of heat resistance.
The
The beads may include at least one polymer resin selected from the group consisting of acrylic resin, acrylic resin, polystyrene resin, nylon resin, and silicone resin. Preferably, the beads may comprise soft acrylic resin, nylon resin or soft silicone resin which is excellent in abrasion and abrasion due to vibration.
The beads may have an average particle diameter of 3 to 50 mu m. When the average particle size of the beads is 3 占 퐉 or more, the beads are embedded in the polymer resin, thereby minimizing the contact area of the surface due to protrusion of the surface, thereby being more advantageous in exhibiting slip property. Or to prevent damage to the light guide plate due to excessive surface irregularities. Preferably, the beads may have an average particle size of 3 to 10 mu m.
The beads may be included in an amount of 5 to 15% by weight based on the weight of the back coating layer. In the case where the content of the beads is 5 wt% or more, the density of particles capable of providing irregularities on the surface is sufficient, which may be more advantageous in minimizing the occurrence of scratches due to frictional wear with the lower part of the light guide plate. In addition, when the content of the beads is 15 wt% or less, the ratio of the polymer resin is prevented from being relatively decreased, which is more advantageous for exhibiting toughness and heat resistance of the surface.
The backside coating layer may optionally include fillers, heat stabilizers, UV photoinitiators, coupling agents, antioxidants, surfactants, silicone additives, UV absorbers, solvents and mixtures thereof.
The filler may be an organic polymer filler comprising a material selected from the group consisting of hard acrylate, polystyrene, nylon, soft acrylate and silicone. Of these, hard acrylate having good solvent resistance and easy dispersion is preferable. The filler is preferably spherical, and may have an average particle diameter of 0.5 to 5 mu m, preferably 0.8 to 3 mu m. The filler preferably has a refractive index different from a refractive index of the polymer resin by 0.02 or more. The filler may be used in an amount of 40 to 80 parts by weight, preferably 50 to 60 parts by weight, based on 100 parts by weight of the polymer resin forming the diffusion layer.
The UV curing agent is not particularly limited as long as it can be used for curing a UV curable resin. In addition to α-hydroxyketone, phenylglyoxylate, benzyldimethyl-ketal, α-aminoketone, and phosphine, triarylsulfonium hexafluoro Include cationic photoinitiators such as triaryl sulfonium hexafluoro antimonite, triaryl sulfonium hexafluorophosphate and diaryl indonium salt.
Examples of the coupling agent include a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, and a silicone compound. These coupling agents may be used singly or in combination.
Examples of the antioxidant include phenol-based, sulfur-based, and phosphorus-based antioxidants. The antioxidant may be used to improve the heat stability of the cured product by preventing oxidation deterioration during thermal curing of the thermosetting resin composition.
The surfactant as an anionic surfactant, a cationic surfactant as a compound having a hydrophilic group and a small number of -COONa, -OSO 3 Na hydrocarbon of a predetermined length in a molecule in the molecule, a nonionic surfactant, an amphoteric surfactant, a sulfonate, sulfate, sulfuric acid, Ester salts, and ethoxylates. These surfactants may be used alone or in combination.
The solvent is compatible with the above-mentioned polymer resin and does not react with the polymer resin, and any known solvent used in the resin composition can be used. Examples of such a solvent include methyl ethyl ketone, methyl isobutyl ketone, toluene, xylene, butyl acetate or cyclohexanone. These solvents may be used alone or in combination of two or more.
The thickness of the back coating layer may range from 3 탆 to 20 탆, more specifically from 3 탆 to 10 탆. When the thickness of the rear coating layer is 3 m or more, the curing degree is sufficient due to obstruction of oxygen in the air and the heat resistance characteristic of the resin may be sufficient. When the thickness is 20 m or less, the resin layer is prevented from cracking or cracking due to the thick thickness .
The optical sheet as described above is improved in heat resistance by a back coating layer containing a phenylsilicone resin, and it is possible to prevent the optical sheet from being deformed due to wrinkles or scratches due to heat. In addition, a urethane component having good elasticity is synthesized in the silicone resin of the back coating layer to improve the heat resistance and the mechanical properties such as toughness, thereby minimizing the occurrence of scratches due to external friction, Performance can be achieved.
(1) forming an optical functional layer on one surface of a base layer; And (2) coating the other surface of the base layer with a phenyl silicone resin composition to form a back coating layer.
The optical sheet manufactured through the above step (2) may have the same configuration as the above-described optical sheet.
Each step will be described in detail below.
Step (1) is a step of forming an optical functional layer on one surface of the base layer.
The specific composition and thickness range of the base layer are as described above. Such a base layer can be produced by a conventional extrusion molding method and a wet coating method.
The details of the structure and kind of the optical function layer are as described above. The optically functional layer may be formed by a conventional manufacturing method, that is, a conventional method of producing a prism pattern layer or a method of manufacturing a diffusion bead layer.
Step (2) is a step of forming a back coating layer by coating the other side of the base layer with a phenyl silicone resin composition.
The phenylsilicon-based resin composition includes a phenylsilicone resin. The phenylsilicone resin has the first repeating unit represented by the above-mentioned formula (1) and the second repeating unit represented by the following formula (2).
Wherein the phenyl silicone resin comprises: (a) preparing a resin having the first repeating unit; And (b) reacting the resin prepared in step (a) with a diisocyanate compound represented by the following formula (3).
(3)
OCN-A-NCO
In Formula 3, A is as defined in Formula 2 above.
At this time, the resin having the first repeating unit may have a reactive functional group at both terminals, for example, a hydroxyl (-OH) group.
Alternatively, the phenyl silicone resin may be prepared by (a) preparing a first resin having the first repeating unit; (b) reacting the first resin prepared in the step (a) with a diisocyanate compound represented by the following formula (3) to prepare a second resin; And (c) reacting the second resin prepared in step (b) with an acrylic compound represented by the following formula (4).
[Chemical Formula 3]
OCN-A-NCO
In Formula 3, A is as defined in Formula 2, and B in Formula 4 is as defined in Formula 2.
Specific examples of the compound of Formula 3 include isophorone diisocyanate (IPDI), toluene diisocyanate (TDI), hexamethylene diisocyanate (HMDI), and mixtures thereof.
Specific examples of the compound of Formula 4 include hexane diol dimethacrylate (HDDMA), butanediol dimethacrylate (BDDMA), ethylene glycol dimethacrylate (EGDMA), and mixtures thereof.
Also, the phenyl silicone resin composition may be prepared by dispersing beads having an average particle diameter of 3 to 10 탆 in the phenyl silicone resin.
The coating of the phenylsilicon-based resin composition is preferably performed by uniformly applying a uniform amount of coating to uniformly form a coating film. The coating method may be a microgravure roll, but is not limited thereto.
The specific thickness range of the coating is as exemplified above.
After the coating, a step of curing by irradiating with UV light may be further carried out. At this time, the irradiation amount of the UV light may be 0.1 to 1 J / cm2, preferably 0.2 to 0.5 J / cm2. A high-pressure mercury lamp having a main wavelength of 200 to 400 nm may be used as the UV light source.
As described above, the optical sheet according to the present invention can be manufactured so as to have excellent heat resistance by changing only the number of polymer which becomes the material of the back coating layer while using the conventional optical sheet manufacturing process as it is. Since the phenylsilicone resin has high toughness and elasticity as well as high heat resistance, it can improve the functional properties of the optical sheet and increase the processability at the time of manufacturing due to quick curing property.
The backlight unit according to the present invention may include a light guide plate, a light source disposed adjacent to the light guide plate, and an optical sheet disposed on one side of the light guide plate. At this time, the optical sheet has the same configuration and characteristics as the optical sheet described above.
The backlight unit may further include an additional optical sheet for improving optical properties, for example, an additional prism sheet, a diffusing sheet, or a reflective sheet.
The backlight unit employs the above-mentioned high heat-resistant optical sheet, and has almost no deterioration in quality due to heat and is excellent in durability, so that the brightness, image quality, and life of the liquid crystal display using the backlight unit can be improved.
Hereinafter, the present invention will be described in more detail with reference to examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.
Production Examples 1 to 5: Preparation of UV Curable Coating Composition
Each of the UV curable coating compositions was prepared by blending the ingredients in the weight ratios as set forth in Table 1 below. Hereinafter, a detailed description of each component to be compounded is as follows.
-Phenyl Silicone Acrylate: A phenylsilicyl acrylate oligomer which is reacted with phenylsilicone and a diisocyanate compound in an equivalent ratio of 1: 1 and then blocked with a methacrylate compound.
- DPGDA: dipropylene glycol diacrylate.
- PETA: pentaerythritol triacrylate.
- Bead particles: Soft acrylic beads having an average particle diameter of 3 μm (Soken company, MX-300).
- Photoinitiator: 1-hydroxycyclohexyl phenyl ketone (BASF, I-184).
Example 1: Production of optical sheet
A prism lens coating layer was formed on one side of a 125 μm thick PET film (T7610B, SKC Co.) as a base film, and a back coating layer was formed on the other side using a UV curable coating composition obtained in Production Example 1 through a microgravure roll. In this case, the diameter of the microgravure roll was 55 Ø. In order to keep the thickness of the coating constant, the gravure roll was used 50/50 mesh, and the coating speed and the peripheral speed were set to optimum conditions, Respectively. The coating was cured by UV irradiation at a dose of 200 mJ / cm 2 using a high-pressure mercury lamp.
Example 2: Production of optical sheet
The procedure of Example 1 was repeated except that the back coating layer was formed using the UV curable coating composition obtained in Preparation Example 2. [
Example 3: Production of optical sheet
The procedure of Example 1 was repeated except that the back coating layer was formed using the UV curable coating composition obtained in Preparation Example 3.
Example 4: Production of optical sheet
The procedure of Example 1 was repeated except that the back coating layer was formed using the UV curable coating composition obtained in Preparation Example 4. [
Example 5: Preparation of optical sheet
Except that the back coating layer was formed using the UV curable coating composition obtained in Preparation Example 5. The results are shown in Table 1 below.
Comparative Example 1
A commercially available prism sheet (HFT32K2, SKC-Haas) having a thickness of 125 mu m was used.
The physical properties of the thus-prepared composition and optical sheet were measured as follows.
Test Example 1: Properties of the UV curable coating composition before curing
(1-1) Viscosity
The viscosity of each composition prepared in Preparation Examples 1 to 5 was measured with a Brookfield viscometer (model: LVD-II +) at 25 ° C.
(1-2) Solid content
Each of the compositions prepared in Preparation Examples 1 to 5 was kept in an oven at 107 ° C for 1 hour to be dried, taken out, weighed, and the solid content was calculated by the following formula.
Solid content (% by weight): [(weight of container and dry solution) - (weight of container)] / (weight of ingredients used) x 100
Test Example 2: Evaluation of physical properties of an optical sheet having a back coating layer
(2-1) Evaluation of adhesion
The optical sheets of the examples and comparative examples were cut into 100 pieces in the area of 10 x 10 mm, the tape was adhered thereon, and the number of the matrix that fell apart while vertically and strongly releasing was indicated. The number of unmolded pieces in a total of 100 pieces was measured and shown in Table 2 below as "unexposed number / total number ".
(2-2) Shrinkage Measurement
The optical sheets of the examples and comparative examples were cut into a length of 200 mm and a width of 15 mm, held in an oven at 150 deg. C for 30 minutes, and then measured for a change in length shrinkage. At this time, the MD (the longitudinal direction of the film) and TD (the width direction of the film) of the coating film were respectively measured.
(2-3) Evaluation of heat resistance
The optical sheets of the examples and comparative examples were uniformly cut into A4 size, corners were fixed on the upper surface of the glass plate, and the films were placed in an oven at 100 DEG C and 120 DEG C for 1 hour to measure the bending state and the number of waves of the coating film .
(2-4) Surface hardness
With respect to the optical sheets of the examples and comparative examples, a hardness of the pencil surface was measured by applying a load of 200 g using a pencil hardness tester (model: KP-M5000M). The pencil was a Mitsubishi product, and the surface hardness of the pencil was measured five times, and it was judged to be defective when two or more scratches were observed.
(2-5) Evaluation of abrasion resistance
The optical sheets of the examples and comparative examples were cut to 5 x 10 cm and abrasion resistance was tested using an abrasion tester (model name: Neoplus Neo-Tribo) (test conditions: moving distance: 40 mm, speed: 2000 mm / min, Cycle: 20times). At this time, the upper surface of the sample was subjected to the abrasion resistance test using a bead-coated 3% haze backsheet. The evaluation level was evaluated as 1 (excellent) ← 3 (normal) → 5 (poor).
(%)
(Number of wrinkles)
As shown in Table 2, the optical sheets of Examples 1 to 5, in which a back coating layer was formed using phenylsilicrylate resin, were evaluated to be equivalent or superior to those of Comparative Example 1, The shrinkage percentage was much better than that of the commercially available film of Comparative Example 1.
Further, as the content of the phenylsilicrylate resin was increased, the shrinkage of the sheet was further reduced. Further, the evaluation of heat resistance was further inhibited by heat, and the surface hardness and abrasion resistance after curing were gradually improved. .
The optical sheet can be used in various mobile devices using a thin-film LCD, a tablet device, or a backlight unit such as a notebook PC.
101: optical sheet (prism sheet), 102: optical sheet (diffusion sheet)
110: base layer, 121: optically functional layer (prism pattern layer),
122: optical functional layer (diffusion bead layer), 130: rear coating layer,
131: phenylsilicone resin, 132: bead.
Claims (14)
An optical functional layer disposed on one surface of the substrate layer; And
An optical sheet including a back coating layer disposed on the other surface of the base layer,
The back coating layer
A phenyl silicone resin having a first repeating unit represented by the following formula (1) and a second repeating unit represented by the following formula (2); And
An optical sheet comprising beads dispersed in said phenyl silicone resin;
[Chemical Formula 1] < EMI ID =
Wherein R 1 is C 1-6 alkyl,
In the formula (2)
R 2 is C 1-6 alkyl;
R 3 is -NCO or
A and B are each independently C 1-6 alkylene, or a saturated or unsaturated C 6-10 carbocycle, wherein said C 6-10 carbocycle is unsubstituted or substituted with one or more C 1-3 alkyl.
Wherein the second repeating unit is represented by the following formula (2a):
(2a)
In the above formula (2a)
R 2 , A and B are as defined in claim 1.
The above-mentioned phenyl silicone resin
And the second repeating unit is contained in a molar ratio of 1 to 1.5 (second repeating unit / first repeating unit) with respect to the first repeating unit.
Wherein the beads have an average particle size of 3 to 10 mu m.
Wherein the back coating layer has a thickness of 3 to 20 占 퐉.
Wherein the back coating layer is UV-cured.
Wherein the optical function layer is a prism pattern layer or a diffusion bead layer,
Wherein the optical sheet is used as a prism sheet or a diffusing sheet.
(2) coating the other surface of the base layer with a phenyl silicone resin composition to form a back coating layer,
Wherein the phenylsilicon-based resin composition has a first repeating unit represented by the following formula (1) and a second repeating unit represented by the following formula (2); And a bead dispersed in the phenyl silicone-based resin.
[Chemical Formula 1] < EMI ID =
In Formula 1, R 1 is as defined in claim 1,
Wherein R 2 , R 3 and A are as defined in claim 1.
The above-mentioned phenyl silicone resin
(a) preparing a resin having the first repeating unit; And
(b) reacting the resin prepared in the step (a) with a diisocyanate compound represented by the following formula (3): < EMI ID =
(3)
OCN-A-NCO
Wherein A in the above formula (3) is as defined in claim 1.
The above-mentioned phenyl silicone resin
(a) preparing a first resin having the first repeating unit;
(b) reacting the first resin prepared in the step (a) with a diisocyanate compound represented by the following formula (3) to prepare a second resin; And
(c) reacting the second resin prepared in step (b) with an acrylic compound represented by the following formula (4): < EMI ID =
[Chemical Formula 3]
OCN-A-NCO
Wherein A in the above formula (3) is as defined in claim 1,
Wherein B in the formula (4) is as defined in claim 1.
The method for manufacturing an optical sheet according to claim 1, wherein, in the step (2), the phenyl silicone resin composition is coated on the other surface of the substrate layer and then UV-cured to form a back coating layer.
Wherein the beads have an average particle diameter of 3 to 10 占 퐉.
A light source disposed adjacent to the light guide plate, and
The backlight unit according to claim 1, comprising the optical sheet according to claim 1 disposed on one side or both sides of the light guide plate.
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| KR101819154B1 (en) | 2016-11-08 | 2018-01-16 | 에스케이씨하이테크앤마케팅(유) | Optical sheet having improved heat resistance and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011500938A (en) | 2007-10-22 | 2011-01-06 | フレキシブル セラミックス，インク． | Fire resistant flexible ceramic resin blends and composite products formed therefrom |
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2015
- 2015-11-24 KR KR1020150164979A patent/KR101794292B1/en active IP Right Grant
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011500938A (en) | 2007-10-22 | 2011-01-06 | フレキシブル セラミックス，インク． | Fire resistant flexible ceramic resin blends and composite products formed therefrom |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101819154B1 (en) | 2016-11-08 | 2018-01-16 | 에스케이씨하이테크앤마케팅(유) | Optical sheet having improved heat resistance and preparation method thereof |
Also Published As
| Publication number | Publication date |
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| KR20170060481A (en) | 2017-06-01 |
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