WO2017048077A1 - 편광자 보호필름, 이를 포함하는 편광판 및 상기 편광판을 포함하는 액정 디스플레이 장치 - Google Patents
편광자 보호필름, 이를 포함하는 편광판 및 상기 편광판을 포함하는 액정 디스플레이 장치 Download PDFInfo
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- WO2017048077A1 WO2017048077A1 PCT/KR2016/010382 KR2016010382W WO2017048077A1 WO 2017048077 A1 WO2017048077 A1 WO 2017048077A1 KR 2016010382 W KR2016010382 W KR 2016010382W WO 2017048077 A1 WO2017048077 A1 WO 2017048077A1
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- protective film
- polarizer protective
- polarizer
- dye
- polarizing plate
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0041—Optical brightening agents, organic pigments
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C08L33/08—Homopolymers or copolymers of acrylic acid esters
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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
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B57/00—Other synthetic dyes of known constitution
- C09B57/007—Squaraine dyes
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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
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B62/00—Reactive dyes, i.e. dyes which form covalent bonds with the substrates or which polymerise with themselves
- C09B62/02—Reactive dyes, i.e. dyes which form covalent bonds with the substrates or which polymerise with themselves with the reactive group directly attached to a heterocyclic ring
- C09B62/12—Reactive dyes, i.e. dyes which form covalent bonds with the substrates or which polymerise with themselves with the reactive group directly attached to a heterocyclic ring to a pyridazine ring
- C09B62/18—Porphyrins; Prophyrazins
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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
- G02B1/08—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of polarising materials
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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
- G02B1/14—Protective coatings, e.g. hard coatings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
- G02B5/223—Absorbing filters containing organic substances, e.g. dyes, inks or pigments
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133504—Diffusing, scattering, diffracting elements
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
- C09K2323/031—Polarizer or dye
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
- C09K2323/035—Ester polymer, e.g. polycarbonate, polyacrylate or polyester
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/50—Protective arrangements
Definitions
- the present specification relates to a polarizer protective film, a manufacturing method thereof, a polarizing plate including the polarizer protective film, and a liquid crystal display device including the polarizing plate.
- Liquid crystal display is one of the most widely used flat panel display.
- a liquid crystal display device has a structure in which a liquid crystal layer is enclosed between a thin film transistor (TFT) array substrate and a color filter substrate.
- TFT thin film transistor
- the arrangement of the liquid crystal molecules of the liquid crystal layer enclosed therebetween is changed, and the image is displayed using the array.
- a liquid crystal display device obtains a color image by cutting a specific spectrum of a backlight light source with a color filter, and color purity is affected by characteristics of various components such as a light source, a color filter, and further, a polarizing plate and an alignment film.
- the emission spectrum characteristic of the light source that irradiates light from the back of the liquid crystal panel.
- the emission spectrum distribution of light sources such as Cold Cathode Fluorescent Lamps (CCFLs), Hot Cathode Fluorescent Lamps (HCFLs), and light emitting diodes (LEDs) may be used as subbands in addition to the wavelength region corresponding to RGB. Since there is an emission spectrum between the respective wavelengths of RGB, this causes color mixing with the color filter, which causes a decrease in color reproducibility.
- the distribution characteristic of the emission spectrum of the cold cathode tube has an impurity emission spectrum around 490 nm and 590 nm, which is between the dominant wavelengths of each RGB primary color, the light transmitted through the color filter is mixed. There is a problem that the color reproducibility area is narrowed.
- the present specification is to replace the protective film of the polarizing plate to increase the color reproducibility and to be thin, at the same time having a good flexibility, the polarizer protective film that does not occur curl or crack, a polarizing plate comprising the same, and a liquid crystal display including the polarizing plate It is an object to provide a device.
- One embodiment of the present specification includes a photocurable resin including a polyfunctional acrylate monomer and an acrylate oligomer having an elongation of 5 to 200%; And it provides a polarizer protective film comprising a dye or pigment having a maximum absorption wavelength of 580 nm to 610 nm.
- the polarizer protective film may further include a dye or a pigment having a maximum absorption wavelength within 480 nm to 510 nm.
- the surface layer may be further provided on one surface of the polarizer protective film.
- it may further include an adhesive layer provided on one surface of the polarizer protective film.
- Another embodiment of the present specification is a polarizer; And it provides a polarizing plate comprising the polarizer protective film provided as a protective film on at least one surface of the polarizer.
- the polarizer protective film and the polarizer are bonded through an adhesive layer.
- Another embodiment of the present specification is a backlight unit; A liquid crystal panel provided on one side of the backlight unit; And a polarizing plate of the above-described embodiment provided between the backlight unit and the liquid crystal panel, wherein the polarizing plate is provided such that the polarizer protective film faces the backlight unit.
- Coating a composition on a release film comprising a multifunctional acrylate monomer, an acrylate oligomer having an elongation of 5 to 200%, and a dye or pigment having a maximum absorption wavelength of 580 nm to 610 nm;
- It provides a method of manufacturing a polarizer protective film comprising the step of peeling the release film from the polarizer protective film.
- the method of manufacturing the polarizer protective film may further include forming a surface layer on the polarizer protective film.
- Another embodiment of the present specification provides a method of manufacturing a polarizing plate comprising adhering the above-described polarizer protective film to at least one surface of the polarizer.
- a coating composition for a polarizer protective film, a polarizer protective film, a polarizing plate including the same, and a liquid crystal display device the color reproducibility is improved by reducing color mixing caused by spectral characteristics of a backlight in a liquid crystal display device and increasing color purity.
- a polarizing plate and a liquid crystal display device can be provided.
- the lower protective film of the polarizing plate is damaged due to the unevenness of the prism sheet provided under the polarizing plate, thereby preventing the problem of increasing haze, thereby exhibiting excellent optical properties.
- the polarizer may serve as a protective film of the polarizer, thereby achieving thinning of the polarizing plate and the liquid crystal display device.
- FIG. 1 and 2 respectively show a liquid crystal display according to one embodiment of the present specification.
- Polarizer protective film of an exemplary embodiment of the present specification is characterized in that it has a high color reproduction effect that can increase the color reproducibility with a single layer film including a photocurable resin and a dye or a pigment without a separate description.
- the polarizer protective film may itself serve as a substrate and a light absorbing layer, there is an excellent effect on the thinning.
- An exemplary embodiment of the present disclosure relates to a polarizer protective film, wherein the photocurable resin includes a polyfunctional acrylate monomer and an acrylate oligomer having an elongation of 5 to 200%, and a maximum absorption wavelength is 580 nm to 610 nm. It is characterized by including a dye or a pigment.
- the dye or pigment is characterized in that the maximum absorption wavelength is within about 580 nm to about 610 nm in the orange region. According to one example, the maximum absorption wavelength of the dye or pigment is within about 580 nm to about 600 nm, specifically 590 nm to 610 nm.
- the dye or pigment that satisfies the above conditions includes, because it absorbs unnecessary light in the spectral region that causes color mixing problems with color filters among light incident from a backlight unit including a light source such as CCFL, LED, etc. of the liquid crystal display device.
- a light source such as CCFL, LED, etc.
- the polarizer protective film is applied to a polarizing plate or a liquid crystal display device, the color reproducibility of the display can be significantly improved.
- the dye or pigment it is preferable to use a little or no change in the transmittance of the composition containing the dye or pigment before and after UV (UV) curing.
- the change in transmittance means a dye or a pigment
- the composition may exclude components whose transmittance is changed by UV (UV) curing.
- a composition comprising the dye or pigment may have a difference in transmittance of less than 5% in the 650 to 710 nm region before and after ultraviolet (UV) curing.
- the composition containing the dye or pigment is preferably a change in transmittance of less than 5%, preferably less than 2%, more preferably less than 1% measured by the following formula (1).
- UV (UV) curing is, after applying the composition containing the dye or pigment on a transparent substrate, the ultraviolet ray of 290 to 320nm wavelength at an irradiation amount of 20 to 600 mJ / cm 2 It means hardened.
- compositions comprising the aforementioned dyes or pigments have a difference in transmittance of less than 5% in the 650 to 710 nm region before and after UV curing, and the dyes or pigments may be added in the 650 to 710 nm wavelength region even after UV curing. It shows little absorption peak, which may help increase brightness and improve color reproducibility.
- the dye or the pigment itself may be used such that the optical properties are hardly changed by ultraviolet (UV) curing as described above, and in the related art, the molecular structure is modified by ultraviolet (UV) irradiation, thereby preventing ultraviolet rays.
- UV ultraviolet
- the molecular structure is modified by ultraviolet (UV) irradiation, thereby preventing ultraviolet rays.
- After the (UV) curing there may be a change in optical properties such as a new absorption peak at a wavelength of 650 to 710 nm, and a core-shell type or surface treatment or surface modification of a dye or pigment which cannot be used for UV curing may be used. have.
- the dye or pigment may include, but are not limited to, a porphyrin derivative compound, a cyanine derivative compound, a squarylium derivative compound, and the like.
- the polarizer protective film may further include a dye or a pigment having a maximum absorption wavelength within 480 nm to 510 nm.
- Dyestuffs or pigments whose maximum absorption wavelength is within the range of 480 nm to 510 nm may further improve color reproducibility by absorbing light in the cyan (blue) region.
- the dye or pigment having a maximum absorption wavelength of 480 nm to 510 nm may have a maximum absorption wavelength of 485 nm to 500 nm.
- the dye or pigment having a maximum absorption wavelength within 480 nm to 510 nm may be an azo dye derivative, a coumarin dye derivative, a fluorescein dye derivative, a cyanine dye derivative, or BODIPY. Family derivatives and the like may be used, but are not limited thereto.
- the photocurable resin is a compound containing a photocurable functional group, and selected from the group consisting of a polyfunctional acrylate monomer, a polyfunctional acrylate oligomer, and a polyfunctional acrylate elastomer It is to include one or more kinds.
- the composition including the dye or pigment may include a compound including a photocurable functional group.
- thermosetting resin composition containing a dye or pigment there is no deformation of the optical properties due to ultraviolet rays, but there is a problem that does not satisfy sufficient surface hardness and scratch resistance as a polarizer protective film or the like. Therefore, when the thermoplastic resin composition is included in the composition including the dye or the pigment, the adhesion may be degraded and the film hardness may be lowered.
- the polarizer protective film according to an exemplary embodiment of the present specification includes a compound including a photocurable functional group, and thus, little or no change in light transmittance before and after UV curing may realize excellent color reproduction, as well as scratch resistance and Since the lower polarizing plate can be effectively protected by exhibiting excellent physical properties such as high hardness, it can be usefully applied to a polarizing plate for display, which is gradually becoming thinner and larger.
- the compound having a photocurable functional group may further include a photocurable monofunctional monomer.
- the photocurable monofunctional monomer is not particularly limited, but for example, amino group-containing monomers such as N-substituted (meth) acrylate or N, N-substituted (meth) acrylate, vinyl acetate or hydroxyalkyl (meth Hydroxyl group-containing monomers such as acrylate, (meth) acrylic acid, 2- (meth) acryloyloxy acetic acid, 2- (meth) acryloyloxy propyl acid, 4- (meth) acryloyloxy butyl acid Carboxyl group-containing monomers such as acrylic acid duplexes, itaconic acid, maleic acid or maleic anhydride, heterocyclic compounds such as vinylpyrrolidone or acryloyl morpholine, monomers containing 2-ureido-pyrimidinone groups and the like can be used.
- amino group-containing monomers such as N-substituted (meth) acrylate or N, N-substituted (meth
- tetrahydrofurfuryl acrylate THFA
- THFMA tetrahydrofurfuryl methacrylate
- HEMA hydroxyethyl methacrylate
- carboxyethyl acrylate carboxyethyl methacrylate
- carboxyethyl methacrylate carboxyethyl methacrylate and the like
- the photocurable monofunctional monomer may be included in an amount of 0 to 20 parts by weight based on 100 parts by weight of the compound or the binder resin including the photocurable functional group. By being contained in 20 weight part or less, the fall of pencil hardness and scratch resistance can be prevented.
- the polarizer protective film may have a pencil hardness of H or more at a load of 500 g.
- the polarizer protective film may include a compound containing a photocurable functional group and a dye stable to radicals, thereby forming a light absorbing layer having improved stability.
- the acrylate-based means not only acrylate but also methacrylate or a derivative in which a substituent is introduced into acrylate or methacrylate.
- the polarizer protective film according to the above-described embodiment of the present specification does not include the stretched film, the phase difference value is substantially close to zero, which is advantageous to be used as the polarizer protective film.
- the multifunctional acrylate monomer means that the acrylate-based functional group contains two or more and has a molecular weight of less than 1,000 g / mol. More specifically, for example, hexanediol diacrylate (HDDA), tripropylene glycol diacrylate (TPGDA), ethylene glycol diacrylate (EGDA), trimethylolpropane triacrylate (TMPTA), trimethylolpropaneethoxy tri Acrylate (TMPEOTA), glycerin propoxylated triacrylate (GPTA), pentaerythritol tetraacrylate (PETA), or dipentaerythritol hexaacrylate (DPHA), and the like.
- the rate monomer is not limited thereto.
- the multifunctional acrylate monomer crosslinks with each other, or crosslinks with an acrylate oligomer which will be described later to serve to impart a certain strength and wear resistance to the protective film.
- the polyfunctional acrylate monomers may be used alone or in combination with each other.
- the acrylate oligomer is an acrylate having an elongation of 5 to 200%, or 5 to 100%, or 10 to 50% as measured by ASTM D638, and in particular, an oligomer having two or more acrylate functional groups. Means.
- the elongation of the acrylate oligomer has the above range, it may exhibit excellent flexibility and elasticity without deteriorating mechanical properties.
- the acrylate oligomer that satisfies the elongation range as described above is excellent in flexibility and elasticity to form the acrylate monomer and the cured resin, and can provide sufficient flexibility and curl properties to the protective film including the same.
- the weight average molecular weight of the acrylate oligomer may have a range of 1,000 to 10,000 g / mol, or 1,000 to 5,000 g / mol, or 1,000 to 3,000 g / mol.
- the acrylate oligomer may be an acrylate oligomer modified with one or more of ethylene oxide, propylene oxide, or caprolactone.
- flexibility may be further imparted to the acrylate oligomer by modification, thereby increasing curl characteristics and flexibility of the protective film.
- the acrylate oligomers may be used alone or in combination with each other.
- the polarizer protective film of the present specification includes a photocurable resin in which the above-described dye or pigment, a polyfunctional acrylate monomer and an acrylate oligomer having an elongation of 5 to 200% are cured by ultraviolet rays.
- the protective film of the present specification does not include a triacetyl cellulose (TAC) component.
- the photocurable resin is a polyfunctional acrylate monomer and an acrylate oligomer having an elongation of 5 to 200% 2: 8 to 8: 2, or 3: 7 to 7: 3 Or cured in a weight ratio of 4: 6 to 6: 4.
- the protective film of the present disclosure may have sufficient flexibility without deterioration of mechanical properties.
- the polarizer protective film of the present specification by including a polyfunctional acrylate-based monomer and an acrylate oligomer having an elongation of 5 to 200% cured photocurable resin, it is possible to high hardness and thinning without deterioration of optical properties.
- the surface hardness and scratch resistance is excellent without a separate functional coating layer such as hard coating.
- excellent flexibility, impact resistance and flexibility are ensured, making it suitable for large area or curved displays.
- the phase difference value is substantially close to zero, and can be used for various display devices that require a low phase difference value as well as a polarizer protective film.
- the polarizer protective film according to the present specification includes a photocurable resin in which an acrylate oligomer is cross-polymerized together with the multifunctional acrylate monomer described above, thereby exhibiting high hardness and at the same time having flexibility. Accordingly, it can be applied as a multifunctional polarizer protective film by acting as a hard coating layer while at the same time functioning as a polarizer protective layer without a separate functional coating layer.
- the polarizer protective film is a dye or pigment having a maximum absorption wavelength of 580 nm to 610 nm based on 100 parts by weight of the photocurable resin of the polyfunctional acrylate monomer and the acrylate oligomer 0.01 to 5 By weight, preferably from 0.01 to 3 parts by weight.
- the dye or pigment is included in less than the above range, the light absorption effect may be insignificant and the color reproducibility improving effect may not be sufficient.
- the luminance may be lowered and other physical properties of the coating composition may be lowered. It is preferably included in the weight range.
- the polarizer protective film may include a dye or a pigment having a maximum absorption wavelength of 480 nm to 510 nm when the total weight of the compound or binder resin including the photocurable functional group is 100 parts by weight. 0.01 parts by weight to 1 part by weight.
- the dye or pigment can further improve the high color reproduction effect through light absorption in the region of 480 nm to 510 nm within the above range, the lowering of 1 part by weight can prevent the decrease in luminance.
- the polarizer protective film may further include a photopolymerization initiator in addition to the above materials.
- the photopolymerization initiator serves to enable the compound including the photocurable functional group described above to initiate photopolymerization by light irradiation.
- photopolymerization initiator those known in the art may be used, for example, 1-hydroxy-cyclohexyl-phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-hydroxy -1- [4- (2-hydroxyethoxy) phenyl] -2-methyl-1-propanone, methylbenzoylformate, ⁇ , ⁇ -dimethoxy- ⁇ -phenylacetophenone, 2-benzoyl-2- (Dimethylamino) -1- [4- (4-morpholinyl) phenyl] -1-butanone, 2-methyl-1- [4- (methylthio) phenyl] -2- (4-morpholinyl ) -1-propanone diphenyl (2,4,6-trimethylbenzoyl) -phosphine oxide, or bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, and the like, but are not limited thereto.
- Irgacure 184 Irgacure 500, Irgacure 651, Irgacure 369, Irgacure 907, Darocur 1173, Darocur MBF, Irgacure 819, Darocur TPO, Irgacure 907, and Esacure KIP 100F.
- photoinitiators can be used individually or in mixture of 2 or more types different from each other.
- the content of the photopolymerization initiator is not particularly limited, but in order to achieve effective photopolymerization without inhibiting the physical properties of the composition for forming the polarizer protective film, the polyfunctional acrylate monomers and acrylates
- the photopolymerization initiator may be included in an amount of 0.1 to 10 parts by weight, preferably 0.1 to 5 parts by weight.
- the photopolymerization initiator is preferably contained in 0.5 to 2 parts by weight relative to 100 parts by weight of the compound or the binder resin containing the photocurable functional group.
- a photoinitiator within this content range, it can prevent that a spectrum is changed by the deformation of the dye or pigment by the radical of a photoinitiator.
- it is advantageous in terms of optical durability since it is advantageous to prevent the increase in transmittance in the 580 nm to 610 nm region and / or the decrease in the transmittance in the 650 nm to 710 nm region due to dye or pigment modification.
- the polarizer protective film is a composition comprising a multifunctional acrylate monomer, an acrylate oligomer having an elongation of 5 to 200%, and a dye or pigment having a maximum absorption wavelength of 580 nm to 610 nm. Coating on a release film; Curing the composition to form a polarizer protective film; And it may be prepared by a method comprising the step of peeling the release film from the polarizer protective film.
- the composition for forming a polarizer protective film may further include a dye or pigment having a maximum absorption wavelength within 480 nm to 510 nm.
- composition for forming a polarizer protective film may further include the photopolymerization initiator described above.
- the polarizer protective film-forming composition may further include a solvent.
- An organic solvent may be used as the solvent, an alcohol solvent such as methanol, ethanol, isopropyl alcohol, butanol, 2-methoxyethanol, 2-ethoxyethanol, 1-methoxy-2-propanol Alkoxy alcohol solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, methyl propyl ketone, ketone solvents such as cyclohexanone, propylene glycol monopropyl ether, propylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol Ethers such as monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethyl glycol monoethyl ether, diethyl glycol monopropyl ether, diethyl glycol monobutyl ether, diethylene glycol-2-ethylhex
- the content of the solvent is not particularly limited because it can be variously adjusted within a range that does not lower the physical properties of each composition for forming the polarizer protective film, the polyfunctional acrylate monomer and acrylate 10 to 400 parts by weight, preferably 100 to 200 parts by weight, based on 100 parts by weight of the total sum of the oligomers.
- the solvent is in the above range it may have a proper flow and applicability.
- the polarizer protective film may further include at least one of organic particles and inorganic particles as necessary. These organic or inorganic particles may be added to the composition for forming a polarizer protective film described above.
- the polarizer protective film may further exhibit an anti-glare property by scattering light by further including organic or inorganic particles.
- the particle diameter of the organic or inorganic particles may be about 1 ⁇ m or more in terms of optimizing the light scattering effect, and 10 ⁇ m or less in terms of proper haze and coating thickness, and more specifically, the organic or inorganic particles. May be particles having a particle diameter of about 1 to about 10 ⁇ m, preferably about 1 to about 5 ⁇ m, more preferably about 1 to about 3 ⁇ m.
- the particle size of the organic or inorganic particles is less than 1 ⁇ m may be an anti-glare effect due to light scattering, if the particle size exceeds 10 ⁇ m, it is necessary to increase the coating thickness to meet the appropriate level of haze, coating thickness If is high, there is a risk of cracking.
- the volume average particle diameter of the organic or inorganic particles may be about 2 to about 10 ⁇ m, preferably about 2 to about 5 ⁇ m, more preferably about 2 to about 3 ⁇ m.
- the said organic or inorganic particle is a kind used for formation of an anti-glare film, it can use without a limitation in the structure.
- the organic particles may be used one or more selected from organic particles consisting of acrylic resins, styrene resins, epoxy resins and nylon resins.
- the organic particles may be methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth).
- the organic particles may be polystyrene, polymethylmethacrylate, polymethylacrylate, polyacrylate, polyacrylate-co-styrene, polymethylacrylate-co-styrene, polymethylmethacrylate-co-styrene, Polycarbonate, polyvinyl chloride, polybutylene terephthalate, polyethylene terephthalate, polyamide, polyimide, polysulfone, polyphenylene oxide, polyacetal, epoxy resin, phenol resin, silicone resin, melamine resin, benzogu At least one selected from amine, polydivinylbenzene, polydivinylbenzene-co-styrene, polydivinylbenzene-co-acrylate, polydiallylphthalate and triallyl isocyanurate polymer or two or more co Although a polymer may be used, it is not limited thereto.
- the inorganic particles may be used one or more selected from the group of inorganic particles consisting of silicon oxide, titanium dioxide, indium oxide, tin oxide, zirconium oxide and zinc oxide, but is not limited thereto.
- the total content of the organic and inorganic particles is 1 to 20 parts by weight, preferably 5 to 15 parts by weight, more preferably based on 100 parts by weight of the photocurable resin of the polyfunctional acrylate monomer and the acrylate oligomer. Preferably from 6 to 10 parts by weight.
- the total content of the organic and inorganic particles is included in less than 1 part by weight based on 100 parts by weight of the photocurable resin of the polyfunctional acrylate monomer and the acrylate oligomer, a haze value due to internal scattering is sufficiently realized. If it is more than 20 parts by weight, the viscosity of the coating composition is increased, the coating property is poor, and the haze value due to internal scattering is too large, and the contrast ratio may be lowered.
- the organic or inorganic particles have a refractive index difference of 0.005 to 0.1, preferably 0.01 to 0.07, more preferably between the polyfunctional acrylate monomer and the photocurable resin of the acrylate oligomer. Preferably 0.015 to 0.05. If the difference in refractive index is less than 0.005, it may be difficult to obtain an appropriate haze value required for glare prevention. In addition, when the difference in refractive index is greater than 0.1, the internal scattering may increase to increase the haze value while decreasing the contrast ratio.
- the polarizer protective film may further include inorganic fine particles as necessary.
- the inorganic fine particles may be included in a form dispersed in the photocurable resin.
- the inorganic fine particles may be added to the composition for forming a polarizer protective film described above.
- the inorganic fine particles may be inorganic fine particles having a nanoscale particle diameter, for example, nanoparticles having a particle diameter of 100 nm or less, or 10 to 100 nm, or 10 to 50 nm.
- the inorganic fine particles may include, for example, silica fine particles, aluminum oxide particles, titanium oxide particles, or zinc oxide particles.
- the protective film when the protective film further includes inorganic fine particles, when the total weight of the photocurable resin is 100 parts by weight, the inorganic fine particles may include 1 to 100 parts by weight, or 10 to 50 parts by weight may be included.
- the inorganic fine particles in the above range can provide a protective film excellent in both high hardness and flexibility.
- the polarizer protective film further includes additives commonly used in the technical field to which the present invention belongs, such as surfactants, antioxidants, UV stabilizers, leveling agents, and antifouling agents, in addition to the aforementioned components. can do.
- additives commonly used in the technical field to which the present invention belongs such as surfactants, antioxidants, UV stabilizers, leveling agents, and antifouling agents, in addition to the aforementioned components. can do.
- the content can be variously adjusted within a range that does not lower the physical properties of the polarizer protective film or the composition for forming them, it is not particularly limited, for example, with respect to 100 parts by weight of the composition for forming the polarizer protective film, 0.1 to 10 parts by weight may be included.
- the polarizer protective film may include a surfactant as an additive, and the surfactant may be a 1 to 2 functional fluorine acrylate, a fluorine surfactant or a silicone surfactant.
- the surfactant may be included in the form of being dispersed or crosslinked in the photocurable resin.
- the polarizer protective film may include a yellowing inhibitor as the additive, and the yellowing inhibitor may include a benzophenone compound or a benzotriazole compound.
- the protective film has a thickness of 10 ⁇ m or more, for example, 10 to 200 ⁇ m, or 10 to 100 ⁇ m, or 10 to 50 ⁇ m, or 10 to 40 ⁇ m, or 10 to 30 ⁇ m. It may have a thickness of. According to the present specification, by having the thickness as described above can be thinner than a film including a separate coating layer, it is possible to provide a high hardness protective film without curling or cracking.
- the average light transmittance in the wavelength range of 580 nm to 610 nm of the aforementioned polarizer protective film may be 30% or less, or 15% or less.
- the average light transmittance in the 400 to 550 nm wavelength region of the polarizer protective film described above may be 35% or more, or 50% or more.
- the maximum absorption wavelength of the polarizer protective film described above may be within the range of the maximum absorption wavelength of 590 to 600nm.
- the average light transmittance in the 480 nm to 510 nm wavelength region of the aforementioned polarizer protective film is less than 70%, or less than 60%. Can be.
- the liquid crystal display body absorbs some of the unnecessary wavelength bands of the light incident from the backlight unit, thereby reducing the intensity.
- a polarizing plate and a liquid crystal display device with improved color reproducibility can be provided by alleviating mixed color phenomenon caused by mismatch with a color filter and increasing color purity.
- the surface layer may be further provided on one surface of the polarizer protective film.
- the surface layer by providing the surface layer, it is possible to prevent the problem that the dye or pigment is moved to the surface or buried out of the surface.
- the functions such as high hardness, scratch resistance, antireflection, anti-glare, etc. can be imparted to the surface layer containing no dye or pigment, it is advantageous in view of the material selection of the above-described protective film or surface layer.
- the surface layer may include a binder resin, for example, a cured product of a compound including a photocurable functional group and a photopolymerization initiator.
- a binder resin for example, a cured product of a compound including a photocurable functional group and a photopolymerization initiator.
- the surface layer may be formed by applying an ultraviolet (UV) curable composition on the protective film and then photocuring the same.
- the ultraviolet (UV) curable composition may be a composition including a compound including a photocurable functional group, a photopolymerization initiator, and a solvent.
- the coating method and photocuring may be applied to the description exemplified as the method of forming the above-described protective film except that the coating is applied on the above-described protective film instead of the release film.
- the compound having a photocurable functional group is not particularly limited as long as it is a compound containing an unsaturated functional group capable of causing a polymerization reaction by ultraviolet rays, but is a (meth) acrylate group, an allyl group, an acryloyl group, or a photocurable functional group. It may be a compound containing a vinyl group.
- the compound including the photocurable functional group may include one or more selected from the group consisting of a polyfunctional acrylate monomer, a polyfunctional acrylate oligomer, and a polyfunctional acrylate-based elastic polymer. have.
- polyfunctional acrylate monomer and the polyfunctional acrylate oligomer those described as materials for the above-mentioned protective film may be used alone or in combination of two or more.
- the multifunctional acrylate-based elastic polymer is excellent in flexibility and elasticity, a polymer containing two or more acrylate functional groups, the weight average molecular weight of about 100,000 to about 800,000g / mol, or about 150,000 to about 700,000g / mol Or from about 180,000 to about 650,000 g / mol.
- the protective film formed by using the coating composition containing the multifunctional acrylate-based elastic polymer can secure high elasticity or flexibility while securing mechanical properties, and also minimize curl or crack generation. Can be.
- the multifunctional acrylate-based elastic polymer may have an elongation of 5 to 200%, or 5 to 100%, or 10 to 50%, as measured by ASTM D638.
- the elongation of the multifunctional acrylate-based elastic polymer has the above range, it may exhibit excellent flexibility and elasticity without deterioration of mechanical properties.
- polyfunctional acrylate-based elastic polymer is polyrotaxane.
- polyrotaxane is a compound in which a dumbbell shaped molecule and a cyclic compound are structurally fitted.
- the dumbbell-shaped molecule includes a constant linear molecule and a blocking group disposed at both ends of the linear molecule, the linear molecule penetrates the inside of the cyclic compound, and the cyclic compound is used to remove the linear molecule. It can thus be moved and prevented by the containment.
- the polyrotasein is a cyclic compound in which a lactone compound in which an acrylate compound is introduced at the terminal is bonded; Linear molecules penetrating the cyclic compound; And a rotasein compound disposed at both ends of the linear molecule and including a blocking group to prevent the cyclic compound from being separated.
- the cyclic compound may be used without any limitation as long as it has a size enough to penetrate or surround the linear molecule, and may be a hydroxyl group, an amino group, a carboxyl group, a thiol group or an aldehyde group that can react with other polymers or compounds. It may also contain functional groups. Specific examples of such cyclic compounds include ⁇ -cyclodextrin, ⁇ -cyclodextrin, ⁇ -cyclodextrin, or mixtures thereof.
- a compound having a straight chain form having a molecular weight of a predetermined or more may be used without great limitation, but a polyalkylene compound or a polycaprolactone group may be used.
- a polyoxyalkylene compound containing an oxyalkylene repeating unit having 1 to 8 carbon atoms or a polycaprolactone group having a lactone repeating unit having 3 to 10 carbon atoms may be used.
- such linear molecules may have a weight average molecular weight of 1,000 to 50,000 g / mol. If the weight average molecular weight of the linear molecule is less than 1,000g / mol may not be sufficient mechanical properties or self-healing capacity of the protective film manufactured using this, if the 50,000g / mol exceeds the compatibility of the protective film produced It may be degraded or the appearance properties or material uniformity may be greatly reduced.
- the containment group can be appropriately adjusted according to the properties of the polyrotasein to be produced, for example, one selected from the group consisting of dinitrophenyl group, cyclodextrin group, adamantane group, trityl group, fluorescein group and pyrene group or Two or more kinds can be used.
- the multifunctional acrylate-based elastic polymer is a urethane-based acrylate polymer.
- the urethane acrylate polymer has a form in which a urethane acrylate oligomer is connected side by side to the main chain of the acrylic polymer.
- the compound having a photocurable functional group among the components of the composition for forming the surface layer may further include a photocurable monofunctional monomer.
- the photocurable monofunctional monomer is not particularly limited, but for example, amino group-containing monomers such as N-substituted (meth) acrylate or N, N-substituted (meth) acrylate, vinyl acetate or hydroxyalkyl (meth Hydroxyl group-containing monomers such as acrylate, (meth) acrylic acid, 2- (meth) acryloyloxy acetic acid, 2- (meth) acryloyloxy propyl acid, 4- (meth) acryloyloxy butyl acid Carboxyl group-containing monomers such as acrylic acid duplexes, itaconic acid, maleic acid or maleic anhydride, heterocyclic compounds such as vinylpyrrolidone or acryloyl morpholine, monomers containing 2-ureido-pyrimidinone groups and the like can be used.
- amino group-containing monomers such as N-substituted (meth) acrylate or N, N-substituted (meth
- tetrahydrofurfuryl acrylate THFA
- THFMA tetrahydrofurfuryl methacrylate
- HEMA hydroxyethyl methacrylate
- carboxyethyl acrylate carboxyethyl methacrylate
- carboxyethyl methacrylate carboxyethyl methacrylate and the like
- the photocurable monofunctional monomer may be included in an amount of 0 to 20 parts by weight based on 100 parts by weight of the compound or the binder resin including the photocurable functional group. By being contained in 20 weight part or less, the fall of pencil hardness and scratch resistance can be prevented.
- a photopolymerization initiator and a solvent may be used as examples exemplified as the components for forming the aforementioned protective film.
- the surface layer does not include a dye or a pigment, a larger amount of the photopolymerization initiator may be used as needed in comparison to the above-described protective film without a problem of deterioration of stability of the dye or pigment according to the content of the photopolymerization initiator.
- the surface layer may include 0.1 to 15 parts by weight, preferably 0.1 to 10 parts by weight of the photopolymerization initiator when the total weight of the compound or binder resin including the photocurable functional group is 100 parts by weight.
- the solvent used in the composition for forming the surface layer may use a solvent that does not have erosion to the protective film.
- a protic solvent may be used as the solvent having no erosion to the protective film as described above, for example, an alcohol solvent such as ethyl alcohol or butanol, and a cellosolve solvent such as methyl cellosolve. If necessary, solvents such as ketones having erosion properties may be mixed and used with respect to the protective film.
- a solvent such as an erosive solvent is used together, it is advantageous in terms of the interlayer adhesion effect of the surface layer and the protective film described above.
- the surface layer is a material exemplified as being added to the above-described protective film, if necessary, such as at least one of organic particles and inorganic particles, inorganic fine particles, surfactants, antioxidants, UV stabilizers, leveling agents, antifouling agents, etc. It may further include an additive commonly used in the art. The type and content of these additives may be applied to the above description of the protective film.
- the surface layer may have a thickness of about 1 ⁇ m or more, for example, 1 to 10 ⁇ m, or 1 to 5 ⁇ m, It can exhibit appropriate optical properties and physical properties within the thickness range as described above.
- the thickness of the surface layer may be 0.01 to 1, specifically 0.03 to 1 compared to the thickness of the protective film.
- the thickness of the surface layer is 0.01 or more compared to the thickness of the protective film can form a uniform surface layer, it is advantageous to protect the protective film, when the value is 1 or less is advantageous in terms of crack resistance of the film.
- it may further include an adhesive layer provided on one surface of the polarizer protective film.
- This adhesive layer can be used to adhere to the polarizer.
- This adhesive bond layer is mentioned later with description regarding a polarizing plate.
- the adhesive layer may be provided on the opposite side of the surface provided with the surface layer of the polarizer protective film.
- the pencil hardness of the aforementioned polarizer protective film may be at least HB, at least 1H, or at least 2H at a 500g load.
- the above-mentioned polarizer protective film is scratched when the steel wool # 0 is attached to the friction tester and reciprocated at 200g load, 300g load, or 400g load 10 times. It may exhibit wear resistance that does not.
- the heat-resistant durability of the aforementioned polarizer protective film has a relative humidity of 85%, a change in transmittance in the 594 nm wavelength band after zero-free wiping before and after storage in a constant temperature and humidity chamber at 72 ° C. for 72 hours. Less than 2%.
- the production method is a release film comprising a composition comprising a multifunctional acrylate monomer, an acrylate oligomer having an elongation of 5 to 200%, and a dye or pigment having a maximum absorption wavelength of 580 nm to 610 nm. Coating on the substrate; Curing the composition to form a polarizer protective film; And peeling the release film from the polarizer protective film.
- the composition may further comprise a dye or pigment having a maximum absorption wavelength of 480 nm to 510 nm.
- the release film may be used without limitation as long as it is commonly used in the art to which the present invention pertains.
- the release film may be a polyolefin-based film such as a polyester film, polyethylene film, polyethylene terephthalate film, polypropylene film, or teflon-based film, and is preferably silicon-based to facilitate peeling. It may be a film released by resin, melamine-based resin or urea-based resin.
- the thickness of the release film is not particularly limited, but a release film having a thickness of about 20 to about 200 ⁇ m may be mainly used.
- the release film may be removed by peeling after curing of the composition before attaching the protective film to the polarizer. Or may be removed after attachment to the polarizer to favor transport and storage or the like.
- the method of applying the composition is not particularly limited as long as it can be used in the art, for example, bar coating method, knife coating method, roll coating method, blade coating method, die coating method, micro gravure coating method , Comma coating, slot die coating, lip coating, or solution casting may be used.
- a polarizer protective film may be formed by irradiating the applied composition with ultraviolet rays to perform a photocuring reaction. If necessary, before irradiating the ultraviolet rays, the coating surface of the composition may be flattened and further dried to volatilize the solvent included in the composition.
- the irradiation amount of ultraviolet rays may be, for example, 20 to 600 mJ / cm 2 , specifically 200 to 600 mJ / cm 2 .
- the ultraviolet light source is not particularly limited as long as it can be used in the art to which the present technology belongs, and for example, a high pressure mercury lamp, a metal halide lamp, a black light fluorescent lamp, or the like can be used.
- the method of manufacturing the polarizer protective film described above further includes forming a surface layer on the polarizer protective film.
- the step of curing after applying the composition for forming the protective film it is possible to perform partial curing or semi-curing rather than complete curing.
- the composition for protective film formation and the composition for surface layer formation can be hardened completely.
- the uncured binder component of the protective film is cured together with the components of the surface layer when it is cured together with the surface layer in the partially or semi-cured state of the protective film, which is advantageous in securing adhesion between the two layers.
- the irradiation amount of ultraviolet rays for the partial curing or semi-curing may be 50 to 200 mJ / cm 2 .
- the surface layer may be formed before or after release of the release film.
- Another embodiment of the present specification is a polarizer; And it provides a polarizing plate comprising the above-mentioned polarizer protective film provided on at least one surface of the polarizer.
- another exemplary embodiment of the present specification provides a method of manufacturing a polarizing plate comprising adhering the above-described polarizer protective film to at least one surface of the polarizer.
- the polarizer exhibits a property of extracting only light vibrating in one direction from incident light while vibrating in various directions, and those known in the art may be used.
- what stretched PVA poly vinyl alcohol
- swelling by swelling the PVA film in an aqueous solution swelling, dyeing with a dichroic substance imparting polarization to the swelled PVA film, stretching the dyed PVA film to stretch
- the polarizer may be formed through a stretching step of arranging the dichroic dye materials side by side in the stretching direction, and a complementary color step of correcting the color of the PVA film subjected to the stretching step.
- the polarizing plate of the present specification is not limited thereto.
- the polarizer protective film described above may be included on both sides of the polarizer, but the polarizer protective film described above is provided on only one surface thereof, and the other side of the polarizer protective film is known in the art as necessary. A film can be provided.
- the polarizing plate of the present specification may further include an adhesive layer provided between the polarizer and the protective film.
- the adhesive layer may include a polarizer adhesive, which may have transparency and maintain polarization characteristics of the polarizer.
- a polarizer adhesive which may have transparency and maintain polarization characteristics of the polarizer.
- Usable adhesives are not particularly limited as long as they are known in the art. For example, there are one-component or two-component polyvinyl alcohol (PVA) adhesives, acrylic adhesives, polyurethane adhesives, epoxy adhesives, styrene butadiene rubber (SBR) adhesives, or hot melt adhesives. It is not limited only to an example.
- PVA polyvinyl alcohol
- SBR styrene butadiene rubber
- the adhesive layer may have a thickness of 0.1 to 10 ⁇ m, or 0.1 to 5 ⁇ m, but is not limited thereto.
- the total thickness of the polarizing plate of the present specification may be 45 ⁇ m or more, for example, 45 to 250 ⁇ m, or 50 to 120 ⁇ m, or 50 to 100 ⁇ m. According to the present specification, while having the thin thickness as described above, it is possible to achieve high hardness without curling or cracking.
- the polarizing plate of the present specification when exposed to room temperature for 24 hours and placed in a plane, the average value of the distance from each corner or one side plane of the polarizing plate is 3mm or less Or 2 mm or less, or 1 mm or less.
- the pencil hardness at 500g load may be 1H or more, 2H or more, or 3H or more.
- the polarizer of the present disclosure may not generate cracks when the polarizing plate is wound around a cylindrical mandrel having a diameter of 15 mm, 12 mm, or 5 mm.
- the protective film provided in the polarizing plate of the present specification may exhibit a surface direction retardation value of 0 to 1 nm, or 0 to 0.6 nm, or 0 to 0.5 nm.
- the polarizing plate including the polarizer protective film may be utilized in various fields as well as the liquid crystal display device.
- it can be used for mobile communication terminals, smart phones, other mobile devices, display devices, electronic blackboards, outdoor billboards, and various display units.
- the polarizing plate may be a twisted nematic (TN), or a polarizing plate for super twisted nematic (STN) liquid crystal, and may be in-plane switching (IPS), super-IPS, or fringe field switching (FFS). It may be a polarizing plate for the horizontal alignment mode, such as), or may be a polarizing plate for the vertical alignment mode.
- TN twisted nematic
- STN super twisted nematic
- FFS fringe field switching
- Another embodiment of the present specification is a backlight unit; A liquid crystal panel provided on one side of the backlight unit; And it provides a liquid crystal display device comprising a polarizing plate of the above-described embodiments provided between the backlight unit and the liquid crystal panel.
- the liquid crystal display device may further include one or two or more prism sheets between the polarizing plate including the polarizer protective film and the backlight unit.
- a polarizer protective film including the above-described dye or pigment is positioned at a position adjacent to the backlight unit, the prism sheet, the diffusion film, or the DBEF, whereby the liquid crystal display device becomes thin and large in area, and the polarizing plate sags toward the backlight unit. Even if it occurs, it is possible to prevent damage such as grinding of the polarizing plate, it is possible to maintain excellent optical properties.
- the liquid crystal display device 1 of the present invention includes a backlight unit 10; A prism sheet 20 provided on the backlight unit 10; And a polarizing plate 100 stacked on the prism sheet 20.
- the backlight unit 10 includes a light source for irradiating light from the back of the liquid crystal panel, and the kind of the light source is not particularly limited, and a light source for a general liquid crystal display device such as CCFL, HCFL, or LED may be used.
- 'top surface' means a surface that is disposed to face the viewer when the polarizer is mounted on a device such as a liquid crystal display.
- a device such as a liquid crystal display.
- polarizer when the polarizer is mounted on the device, it means the direction toward the viewer.
- 'bottom' or 'bottom' refers to a face or direction disposed so as to face away from the viewer when the polarizer is mounted on the device.
- the prism sheet 20 is provided on the backlight unit 10. Since the light emitted from the backlight unit 10 passes through the light guide plate and the diffusion sheet (not shown), the prism sheet 20 is lowered in brightness, and thus is provided to raise the brightness again. Such prism sheet 20 Is provided below the lower polarizer. However, since the prism sheet 20 includes a concave-convex structure, there is a problem in that the haze is increased by damaging the lower protective film of the lower polarizing plate which is in contact with the prism sheet 20. However, in the liquid crystal display device of the present specification, the polarizer protective film 30 including the dye or pigment adhered to the polarizer 50 of the polarizing plate 100 through the adhesive layer 40 is directed toward the prism sheet 20.
- the polarizer protective film 30 may have an excellent effect on high color reproduction and thinning without a separate substrate, and may also improve the problem of increasing haze by damaging the lower protective film of the polarizing plate as described above. will be.
- one surface of the polarizer 50 is provided with a general protective film 60, and the other surface of the polarizer includes an adhesive layer 40 and a dye or a pigment.
- a polarizing plate 100 including a protective film 30 is provided.
- the polarizer protective film 30 of the present specification has a structure laminated to the lower side of the liquid crystal display device, that is, toward the prism sheet 20 side. Due to such a laminated structure, the polarizing plate 100 may be damaged by the unevenness of the prism sheet 20, thereby preventing the problem of increasing haze and exhibiting excellent optical properties.
- the transmittance characteristics according to the wavelength of the polarizer protective film 30 in the liquid crystal display device to reduce the color mixing caused by the spectral characteristics of the backlight and to improve the color purity provides a liquid crystal display device with improved color reproducibility can do.
- a diffusion film or a dual brightness enhancement film (not shown in the drawings) is provided between the prism sheet 20 and the polarizing plate 100 or between the backlight unit 10 and the prism sheet 20. Or the like) may be further included.
- the diffusion film or the DBEF film is positioned between the prism sheet 20 and the polarizing plate 100, the polarizer protective film 30 of the polarizing plate 100 is in contact with the diffusion film or the DBEF film, and in this case, the diffusion film or The problem of damage to the lower polarizing plate and increase of haze by the DBEF film or the like can be similarly prevented.
- the surface layer 31 may be further provided on a surface of the polarizer protective film 30 that faces the prism sheet 20 (FIG. 2).
- the layer provided on the polarizing plate 100 depends on the structure of a general liquid crystal display device.
- the lower glass substrate 70, the thin film transistor 75, the liquid crystal layer 80, the color filter 85, and the upper glass are illustrated in FIG. 1.
- the substrate 90 and the upper polarizer 95 are sequentially stacked, the liquid crystal display device of the present disclosure is not limited thereto, and some of the layers illustrated in FIG. It may include all of the structures to which the layer, substrate, film, sheet and the like are added.
- TMPTA trimethylolpropane triacrylate
- DPCA120 Nippon Kayaku, caprolactone modified 6 functional acrylate, 12% elongation measured by ASTM D638, Mw 1,950
- PU3400 mowon, ethylene oxide modified 3 functional acrylate , 20% elongation measured by ASTM D638, 30 g of MW 2,500
- porphyrin-based dye having a maximum absorption wavelength of 593 nm, 0.2 g
- photopolymerization initiator trade name: Darocur TPO
- solvent MEK methyl ethyl ton
- TMPTA trimethylolpropane triacrylate
- DPCA120 20 g
- TA604AU Japanese oxide modified trifunctional acrylate, 49% elongation measured by ASTM D638, MW 2,300
- a coating solution was prepared by mixing 0.2 g of a dye, 2 g of a photopolymerization initiator (trade name: Darocur TPO), and 10 g of a solvent MEK (methyl ethyl ton).
- the coating solution was bar coated on a PET release film. This was dried at 60 ° C. for 2 minutes and irradiated with black UV light 600 mJ / cm 2 in a nitrogen atmosphere to obtain a protective film having a thickness of 25 ⁇ m.
- TMPTA trimethylolpropane triacrylate
- DPCA120 Nippon Kayaku, caprolactone modified 6 functional acrylate, elongation 12% measured by ASTM D638, Mw 1,950
- PU3400 Miwon, ethylene oxide modified 3 functional acrylic Rate, 20% elongation measured by ASTM D638, 30 g of MW 2,500
- porphyrin-based dyes having a maximum absorption wavelength of 593 nm
- 0.06 g of dye FDB-007 (yamada chemical) having a maximum absorption wavelength of 493 nm
- a photoinitiator Trade name: Darocur TPO 2g
- 10g solvent MEK methylethyltone
- the coating solution was bar coated on a PET release film. This was dried for 2 minutes at 60 ° C. and then irradiated with 600 mJ / cm 2 of light with black UV in a nitrogen atmosphere to obtain a protective film having a thickness of 25 ⁇ m.
- TMPTA trimethylolpropane triacrylate
- DPCA120 Nippon Kayaku, caprolactone modified 6 functional acrylate, elongation 12% measured by ASTM D638, Mw 1,950
- PU3400 mowon, ethylene oxide modified 3 functional acrylic Coating, 20% elongation measured by ASTM D638, 30 g of MW 2,500
- porphyrin-based dye with a maximum absorption wavelength of 593 nm, 0.2 g
- photopolymerization initiator trade name: Darocur TPO
- solvent MEK methyl ethyl ton 10 g
- the coating solution was bar coated on a PET release film. It was dried for 2 minutes at 60 °C and irradiated with a light amount of 200 mJ / cm 2 with black UV in a nitrogen atmosphere to obtain a protective film having a thickness of 25 ⁇ m.
- a coating solution was prepared by mixing 70 g of pentaerythritol tri (tetra) acrylate (PETA), 30 g of Ta604AU, 2 g of a photopolymerization initiator (trade name: Darocur TPO), and 100 g of a solvent MEK (methyl ethyl ketone).
- the coating solution was bar-coated to a semi-polarized polarizer protective film with a thickness of 2 ⁇ m. This was dried for 2 minutes at 60 °C and irradiated with a light amount 600 mJ / cm 2 with black UV in a nitrogen atmosphere to obtain a protective film having a total thickness of 27 ⁇ m.
- TMPTA trimethylolpropane triacrylate
- EB1290 SK Cytec, 6 functional urethane acrylate, elongation measured by ASTM D638 0%, mw 1,000
- photopolymerization initiator trade name: Darocur TPO
- dye PD-319 0.2 g of Mitsui
- 10 g of solvent MEK methyl ethyl ton
- a coating solution was prepared by mixing 50 g of pentaerythritol tri (tetra) acrylate, 50 g of 6-functional urethane acrylate, 0.5 g of a light absorbing agent PD-319 (Mitsui), 5 g of a photopolymerization initiator Irgacure 184, and 100 g of a solvent MEK (methyl ethyl ton). .
- the coating solution was coated on a 60 ⁇ m thick TAC film with a thickness of 3 ⁇ m, dried at 60 ° C. for 2 minutes, and cured at about 200 mj / cm 2 with a mercury lamp.
- the thickness of the adhesive layer is approximately 1 It laminated and bonded with PVA film so that it might become micrometer, and the PET release film was peeled off.
- a polarizing plate was prepared by bonding a 40 ⁇ m thick TAC in the same manner.
- the protective films prepared in Comparative Examples 1 and 2 were laminated by laminating with a PVA film so that the thickness of the adhesive layer was about 1 ⁇ m using an acrylic adhesive, respectively, and the PET release film was peeled off.
- a polarizing plate was prepared by bonding a 40 ⁇ m thick TAC in the same manner.
- a polarizing plate was prepared in the same manner as in Experimental Examples 1 to 3, except that the prepared protective films were each adhered to the PVA film side of the TAC film. Since the protective film prepared in the comparative example does not include a release film, no separate peeling process was performed.
- UV-VIS-NIR spectrometer Solidspec-3700, SHIMADZU
- the transmittance at 300 to 800 nm wavelength was measured by the integrating sphere type.
- the surface of the film was reciprocated five times with a 500 g load according to the measurement standard JIS K5400, and then the hardness without scratches was confirmed.
- Each polarizing plate was cut into 10 cm x 10 cm and stored for 24 hours, and then the average value of the distance from which one side of each corner is spaced apart from the plane was measured.
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Abstract
Description
실험예1 | 실험예2 | 실험예3 | 실험예4 | 실험예5 | 비교 실험예 1 | 비교 실험예 2 | 비교실험예3 | |
편광판 두께(㎛) | 91 | 90 | 91 | 91 | 93 | 91 | 90 | 131 |
594 nm 투과율(%) | 5.2 | 4.9 | 5.0 | 4.9 | 5.0 | 2.7 | 4.6 | 42.7 |
493 nm 투과율(%) | 42.3 | 42.4 | 42.3 | 33.5 | 42.5 | 41.7 | 42.3 | 42.7 |
연필 경도 | 3H | 2H | 3H | 3H | 3H | 3H | 2B | 2H |
내스크래치성 | 500g | 300g | 400g | 500g | 500g | 500g | 50g | 200g |
컬특성(mm) | 0.7 | 0.3 | 0.3 | 0.5 | 0.5 | 28.5 | 0.1 | 0.3 |
굴곡 테스트 | OK | OK | OK | OK | OK | NG | OK | OK |
Claims (23)
- 다관능 아크릴레이트계 모노머와 5 내지 200%의 신율을 갖는 아크릴레이트계 올리고머를 포함하는 광경화 수지; 및 최대 흡수 파장이 580 nm 내지 610 nm인 염료 또는 안료를 포함하는 편광자 보호필름.
- 청구항 1에 있어서, 상기 편광자 보호필름의 일면에 구비된 접착제층을 더 포함하는 편광자 보호필름.
- 청구항 1에 있어서, 상기 염료 또는 안료는 포르피린(porphyrin) 유도체 화합물, 시아닌(cyanine) 유도체 화합물, 또는 스쿠아릴리움(squarylium) 유도체 화합물인 것인 편광자 보호필름.
- 청구항 1에 있어서, 상기 편광자 보호필름은 최대 흡수 파장이 480 nm 내지 510 nm 내에 있는 염료 또는 안료를 추가로 포함하는 것인 편광자 보호필름.
- 청구항 1에 있어서, 상기 광경화 수지는 광경화성 관능기를 포함하는 화합물이며, 다관능 아크릴레이트계 모노머, 다관능 아크릴레이트계 올리고머, 및 다관능 아크릴레이트계 탄성 고분자로 이루어진 군으로부터 선택되는 1종 이상을 포함하는 것인 편광자 보호필름.
- 청구항 1에 있어서, 500g 하중에서 연필 경도가 H 이상인 것인 편광자 보호필름.
- 청구항 1에 있어서, 상기 다관능 아크릴레이트계 모노머는 헥산디올디아크릴레이트(HDDA), 트리프로필렌글리콜 디아크릴레이트(TPGDA), 에틸렌글리콜 디아크릴레이트(EGDA), 트리메틸올프로판 트리아크릴레이트(TMPTA), 트리메틸올프로판에톡시 트리아크릴레이트(TMPEOTA), 글리세린 프로폭실화 트리아크릴레이트(GPTA), 펜타에리트리톨 테트라아크릴레이트(PETA), 및 디펜타에리트리톨 헥사아크릴레이트(DPHA) 중 1 이상을 포함하는 것인 편광자 보호필름.
- 청구항 1에 있어서, 상기 아크릴레이트계 올리고머의 중량평균분자량은 1,000 내지 10,000 g/mol인 것인 편광자 보호필름.
- 청구항 1에 있어서, 상기 아크릴레이트계 올리고머는 에틸렌 옥사이드(ethylene oxide), 프로필렌 옥사이드(propylene oxide), 또는 카프로락톤(caprolactone) 중 1종 이상으로 변성된 아크릴레이트계 올리고머인 것인 편광자 보호필름.
- 청구항 1에 있어서, 상기 광경화 수지는 다관능 아크릴레이트계 모노머 및 5 내지 200%의 신율을 갖는 아크릴레이트계 올리고머가 2:8 내지 8:2의 중량비로 경화되어 있는 것인 편광자 보호필름.
- 청구항 1에 있어서, 상기 편광자 보호필름은 광중합 개시제를 추가로 포함하는 것인 편광자 보호필름.
- 청구항 1에 있어서, 상기 편광자 보호필름은 유기 입자 및 무기 입자 중 적어도 1종 또는 무기 미립자를 더 포함하는 것인 편광자 보호필름.
- 청구항 1에 있어서, 580 nm 내지 610nm 파장 영역에서의 평균 광투과율이 30% 이하인 편광자 보호필름.
- 청구항 1에 있어서, 400 내지 550nm 파장 영역에서의 평균 광투과율이 35% 이상인 편광자 보호필름.
- 청구항 5에 있어서, 480 nm 내지 510 nm 파장 영역에서의 평균 광투과율이 70% 미만인 편광자 보호필름.
- 청구항 1에 있어서, 최대 흡수 파장이 590 내지 600nm의 범위 내인 편광자 보호필름.
- 청구항 1에 있어서, 상기 편광자 보호필름의 일면에 구비된 표면층을 더 포함하는 편광자 보호필름.
- 청구항 18에 있어서, 상기 표면층의 두께는 상기 편광자 보호필름 두께 대비 0.01 내지 1인 것인 편광자 보호필름.
- 청구항 1에 있어서, 상기 표면층은 유기 입자 및 무기 입자 중 적어도 1종 또는 무기 미립자를 더 포함하는 것인 편광자 보호필름.
- 편광자; 및 상기 편광자의 적어도 일면에 보호필름으로서 구비된 청구항 1 내지 20 중 어느 한 항에 따른 편광자 보호필름을 포함하는 편광판.
- 백라이트 유닛; 상기 백라이트 유닛의 일측에 구비된 액정 패널; 및 상기 백라이트 유닛과 상기 액정 패널 사이에 구비된 청구항 21의 편광판을 포함하는 액정 디스플레이 장치.
- 다관능 아크릴레이트계 모노머, 5 내지 200%의 신율을 갖는 아크릴레이트계 올리고머, 및 최대 흡수 파장이 580 nm 내지 610 nm인 염료 또는 안료를 포함하는 조성물을 이형 필름 상에 코팅하는 단계;상기 조성물을 경화시켜 편광자 보호필름을 형성하는 단계; 및상기 이형 필름을 상기 편광자 보호필름으로부터 박리하는 단계를 포함하는 청구항 1 내지 20 중 한 항에 따른 편광자 보호필름의 제조방법.
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JP2017566627A JP6687184B2 (ja) | 2015-09-15 | 2016-09-13 | 偏光子保護フィルム、これを含む偏光板、および前記偏光板を含む液晶ディスプレイ装置 |
US15/744,037 US11003017B2 (en) | 2015-09-15 | 2016-09-13 | Polarizer protective film, polarizing plate comprising same, and liquid crystal display device comprising polarizing plate |
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Also Published As
Publication number | Publication date |
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JP2018528449A (ja) | 2018-09-27 |
KR101987265B1 (ko) | 2019-06-11 |
CN107850712B (zh) | 2021-03-12 |
JP6687184B2 (ja) | 2020-04-22 |
KR20170032869A (ko) | 2017-03-23 |
US20180210288A1 (en) | 2018-07-26 |
CN107850712A (zh) | 2018-03-27 |
US11003017B2 (en) | 2021-05-11 |
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