WO2020040570A1 - 마스크 필름 및 이를 이용한 편광판의 제조방법 - Google Patents

마스크 필름 및 이를 이용한 편광판의 제조방법 Download PDF

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Publication number
WO2020040570A1
WO2020040570A1 PCT/KR2019/010698 KR2019010698W WO2020040570A1 WO 2020040570 A1 WO2020040570 A1 WO 2020040570A1 KR 2019010698 W KR2019010698 W KR 2019010698W WO 2020040570 A1 WO2020040570 A1 WO 2020040570A1
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Prior art keywords
polarizing plate
mask film
film
polarizer
meth
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PCT/KR2019/010698
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English (en)
French (fr)
Korean (ko)
Inventor
이병선
나균일
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주식회사 엘지화학
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Publication of WO2020040570A1 publication Critical patent/WO2020040570A1/ko

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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
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/18—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet characterized by perforations in the adhesive tape
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature

Definitions

  • the present invention relates to a mask film used for producing a polarizing plate having a localized discoloration region through a chemical treatment, and a method of manufacturing a polarizing plate using the same.
  • Polarizers have been applied to various display devices such as liquid crystal displays and organic light emitting devices.
  • polarizing plates are dyed iodine and / or dichroic dye on a polyvinyl alcohol (hereinafter, referred to as PVA) -based film, crosslinking the iodine and / or dichroic dye using boric acid, etc. It is used in the form of a protective film laminated on one side or both sides of the PVA polarizer produced by orientation by the method.
  • PVA polyvinyl alcohol
  • the polarizing plate is dark black because it is dyed with iodine and / or dichroic dye in the entire area of the polarizing plate, and as a result, it is difficult to impart various colors to the display device, and in particular, the polarizing plate on a component such as a camera In this case, the polarizing plate absorbs more than 50% of the amount of light, thereby deteriorating the visibility of the camera lens.
  • the above physical method degrades the appearance of the image display apparatus and may damage the polarizing plate due to the nature of the punching process.
  • the perforated portion of the polarizing plate should be formed in an area sufficiently far from the corner.
  • the bezel portion of the image display device becomes relatively wider. NARROW BEZEL's narrow bezel design trend is also a problem.
  • the camera module is mounted on the perforated portion of the polarizer as described above, the camera lens is exposed to the outside, so there is a problem in that contamination and damage of the camera lens are likely to occur when used for a long time.
  • the present invention is to solve the above problems, by providing a mask film used in the production of a polarizing plate having a localized discoloration area through a chemical treatment, as in the prior art, it is possible to remove the polarization without physically punctured, polarized light By minimizing wrinkles in these removed areas, it is intended to provide a polarizing plate having excellent surface roughness and haze.
  • the present invention is to provide a mask film used in the production of a polarizing plate having a localized discoloration region through a chemical treatment with excellent process efficiency, a manufacturing method of a polarizing plate using the same and a polarizing plate thereby.
  • the protective film And a pressure-sensitive adhesive layer provided on one surface of the protective film, wherein the pressure-sensitive adhesive modulus of the pressure-sensitive adhesive layer is 0.3 MPa to 5 MPa, and provides a mask film having a perforated part integrally passing through the protective film and the pressure-sensitive adhesive layer.
  • the step of laminating the mask film on one surface of the polarizer Decolorizing a portion corresponding to the perforated portion of the mask film; And it provides a method of manufacturing a polarizing plate having a non-polarization portion comprising the step of removing the mask film.
  • a polarizing plate having a non-polarization part manufactured according to the method for producing a polarizing plate of the present invention.
  • the present invention provides an image display device including the polarizing plate described above.
  • the mask film according to the embodiment of the present invention controls the modulus of the pressure-sensitive adhesive of the pressure-sensitive adhesive layer, thereby providing a pressure-sensitive adhesive force that can be effectively adhered to the polarizer and at the same time easy to peel, roll-to-roll process (roll By providing a convenience to the roll and decolorizing by masking a mask film on at least one surface of a polarizer having an iodine or a dichroic dye, it is possible to decolorize only a desired portion, thereby having an excellent process efficiency.
  • FIG. 1 illustrates a mask film composed of a protective film and an adhesive layer according to an exemplary embodiment of the present invention.
  • Figure 2 illustrates a mask film composed of a protective film, pressure-sensitive adhesive layer and a release film according to an embodiment of the present invention.
  • Figure 3 illustrates a polarizing plate manufacturing method according to an embodiment of the present invention.
  • FIG. 4 schematically illustrates a method of measuring edge roughness according to an exemplary embodiment of the present invention.
  • FIG. 5 illustrates a case where a polarizer having an edge roughness of the discoloration part satisfying 30 ⁇ m or less is photographed using a lens.
  • FIG. 6 illustrates a case where a polarizer having an edge roughness greater than 30 ⁇ m is photographed using a lens.
  • the "perforation part” means a part where a hole is drilled.
  • (meth) acrylic acid means acrylic acid or methacrylic acid.
  • (meth) acrylate means acrylate or methacrylate.
  • the protective film And a pressure-sensitive adhesive layer provided on one surface of the protective film, wherein the pressure-sensitive adhesive modulus of the pressure-sensitive adhesive layer is 0.3 MPa to 5 MPa, and has a perforated part integrally passing through the protective film and the pressure-sensitive adhesive layer.
  • the pressure-sensitive adhesive modulus is 0.3 MPa to 5 MPa, more preferably 0.5 MPa to 3 MPa.
  • peeling of the mask film is easy. That is, when the modulus is less than 0.3MPa, the pressure-sensitive adhesive is buried in the polarizer when peeling the mask film, when the modulus is more than 5MPa, there is a problem that the adhesive force is not effective and the polarizer and the adhesion is not effective.
  • the presence of the perforations causes the interface to exist in the middle on the plane, and if the modulus is not within the above range, the adhesive at the perforation boundary is damaged or , The problem that the adhesive is transferred to the release film rather than the mask film may occur.
  • the modulus of the pressure-sensitive adhesive is applied to the silicone release treated polyethylene terephthalate film and dried at 90 ° C. for 4 minutes and aged at 7 ° C. for 35 days at 45 ° C. and 45% RH, respectively.
  • a micro-adhesive adhesive film was prepared, a pressure-sensitive adhesive film was released from a release film, and a plurality of obtained adhesive films were laminated and cut to prepare circular specimens having a thickness of 500 ⁇ m and a diameter of 8 mm.
  • PhysicaMCR501 (Anton parr) G) is used to mean the value at 25 °C when evaluated at 1Hz and 5% strain while raising the temperature at a temperature rising rate of 5 °C / min from 0 °C to 100 °C on a disk of 8mm diameter.
  • the mask film may further have a release film attached to the pressure-sensitive adhesive layer, the release film is removable from the pressure-sensitive adhesive layer.
  • the mask film may have a perforation part through the protective film, the pressure-sensitive adhesive layer and the release film integrally.
  • two or more of the perforations are disposed at predetermined intervals in the longitudinal direction of the mask film.
  • two or more of the perforations are disposed at equal intervals in at least the longitudinal direction of the mask film.
  • two or more of the perforations are disposed at equal intervals in the longitudinal direction of the mask film and the width direction of the mask film.
  • FIG. 1 illustrates a mask film composed of a protective film and an adhesive layer according to an exemplary embodiment of the present invention.
  • Figure 2 illustrates a mask film composed of a protective film, pressure-sensitive adhesive layer and a release film according to an embodiment of the present invention.
  • the relatively dark areas mean perforations penetrating the mask film.
  • the forming of the perforations in the mask film is not particularly limited, and may be performed through film perforation methods well known in the art, for example, mold processing, knife processing, or laser processing.
  • the forming of the perforation part may be performed through laser processing.
  • the laser processing may be performed using laser processing apparatuses generally known in the art, and are not particularly limited.
  • Laser processing conditions such as the type of laser device, output power, laser pulse repetition rate, etc. may vary depending on the material, thickness of the film, and the shape of the perforated part, and those skilled in the art may appropriately determine the laser processing conditions in consideration of the above points. You can choose to.
  • a carbon dioxide (CO 2 ) laser device having a center wavelength of about 9 ⁇ m to 11 ⁇ m or about 300 nm to 400 nm
  • a perforation part may be formed using a phosphorescent ultraviolet (UV) device, and at this time, the maximum average power of the laser device may be about 0.1W to about 30W, and the pulse repetition rate may be about 0kHz to about 50kHz, but is not limited thereto. It is not.
  • Protective film of the mask film of the present invention Polyethylene (Poly Ethylene, PE), Polypropylene (Poly Propylene, PP), Polyethylene terephthalate (Poly Ethylene Terephtalate, PET) and the like; Or a vinyl acetate-based film such as ethylene vinyl acetate (Ethylene Vinyl Acetate, EVA), poly vinyl acetate (Poly Vinyl Acetate) may be used, but is not limited thereto.
  • the thickness of the mask film is not limited thereto, but may be about 10 ⁇ m to about 100 ⁇ m, preferably about 10 ⁇ m to about 70 ⁇ m.
  • the mask film of the present invention may be used to form a localized discoloration portion by laminating the mask film on at least one surface of the polarizer and then processing a portion corresponding to the perforation portion.
  • the local bleaching area of the present invention may be a polarization canceling area.
  • the stacking of the mask film on one surface of the polarizer may be performed by laminating methods of a film well known in the art, for example, attaching a mask film and a polarizing member through an adhesive layer.
  • the pressure-sensitive adhesive layer may be an adhesive such as an acrylic pressure sensitive adhesive, a silicone pressure sensitive adhesive, an epoxy pressure sensitive adhesive, or a rubber pressure sensitive adhesive, but is not limited thereto.
  • the pressure-sensitive adhesive layer includes two different acrylic copolymer resins.
  • the pressure-sensitive adhesive layer may further include a crosslinking agent. It is possible to control the modulus and adhesive force of the pressure-sensitive adhesive according to the content of the crosslinking agent.
  • the two kinds of acrylic copolymer resins may be represented by first acrylic copolymer resins and second acrylic copolymer resins, respectively.
  • first acrylic copolymer resin may be represented by copolymer resin A
  • second acrylic copolymer resin may be represented by copolymer resin B.
  • the pressure-sensitive adhesive layer may be a pressure-sensitive adhesive mixed with two different acrylic copolymer resins at a predetermined ratio and added with a crosslinking agent. It is possible to control the modulus and adhesive force of the pressure-sensitive adhesive according to the content of the crosslinking agent.
  • the pressure-sensitive adhesive layer is a first acrylic copolymer resin; Second acrylic copolymer resin; And crosslinking agents.
  • the pressure-sensitive adhesive layer may be a mixture of the first acrylic copolymer resin and the second acrylic copolymer resin and adding a crosslinking agent.
  • the first acrylic copolymer resin may be mixed in a proportion of 6 parts by weight to 12 parts by weight, preferably 8 parts by weight to 10 parts by weight, based on 1 part by weight of the second acrylic copolymer resin.
  • the first acrylic copolymer resin is an alkyl (meth) acrylate; Hydroxyalkyl (meth) acrylates; And (meth) acrylic acid.
  • the first acrylic copolymer resin may include 90 to 98 parts by weight of alkyl (meth) acrylate based on 100 parts by weight of the total monomers of the first acrylic copolymer resin; 0.5 to 2 parts by weight of hydroxyalkyl (meth) acrylate; And 1 to 8 parts by weight of (meth) acrylic acid, preferably 92 to 96 parts by weight of alkyl (meth) acrylate based on 100 parts by weight of the total monomers of the first acrylic copolymer resin; 0.5 to 1.5 parts by weight of hydroxyalkyl (meth) acrylate; And it may include 3 to 7 parts by weight of (meth) acrylic acid.
  • the second acrylic copolymer resin is an alkyl (meth) acrylate; Hydroxyalkyl (meth) acrylates; (Meth) acrylic acid; And polyalkyl (meth) acrylates.
  • the first acrylic copolymer resin may include 89 parts by weight to 96 parts by weight of alkyl (meth) acrylate based on 100 parts by weight of the total monomers of the first acrylic copolymer resin; 0.5 to 2 parts by weight of hydroxyalkyl (meth) acrylate; 1 to 8 parts by weight of (meth) acrylic acid; And 1 to 8 parts by weight of polyalkyl (meth) acrylate, preferably 90 to 95 parts by weight of alkyl (meth) acrylate based on 100 parts by weight of the total monomers of the first acrylic copolymer resin; 0.5 to 1.5 parts by weight of hydroxyalkyl (meth) acrylate; 2 to 6 parts by weight of (meth) acrylic acid; And 2 parts by weight to 6 parts by weight of polyalkyl (meth) acrylate.
  • the alkyl group included in the alkyl (meth) acrylate may be linear or branched chain, the carbon number of the alkyl group may be 1 to 20.
  • the alkyl (meth) acrylate is methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, t- Butyl (meth) acrylate, sec-butyl (meth) acrylate, pentyl (meth) acrylate, 2-ethylbutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, Isooctyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (me (me
  • the alkyl group in the alkyl (meth) acrylate is bonded in a repeated form.
  • the hydroxyalkyl (meth) acrylate is 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6 It may include one or two or more selected from the group consisting of-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate and 2-hydroxy ethylene glycol (meth) acrylate, It is not limited.
  • the first acrylic copolymer resin is butyl acrylate; 2-hydroxyethyl (meth) acrylate; And acrylic acid.
  • the second acrylic copolymer resin is butyl acrylate; 2-hydroxyethyl (meth) acrylate; Acrylic acid; And methacryloyl polymethylmethacrylate.
  • the decolorizing solution contacts the polyvinyl alcohol-based polarizer through the perforated part, and as a result, only the portion corresponding to the perforated area is Partial discoloration occurs.
  • the said perforation part should just be formed so that it may correspond to the shape of the area
  • the perforation part may be formed to correspond to the shape of the part at a position where a component such as a camera is mounted, may be formed in the shape of a product logo in the area where the product logo is printed, In the case of providing color, the frame may be formed on the edge of the polarizer.
  • the method may further include providing a release film on an opposite surface of the mask film opposite to the polarizer of the protective film.
  • a decolorization process may be performed to minimize sagging due to MD shrinkage caused by polarizer swelling.
  • the protective film of the mask film is removed after local discoloration, there is a difference from the protective film of the polarizing plate for protecting the polarizing plate.
  • the removing of the mask film may be performed by a method of peeling the mask film from the polarizer. More specifically, the removing of the mask film may be performed by a method of peeling the mask layer from the polarizer using a peeling roll or the like.
  • the decolorizing solution is preferably a strong base solution having a pH of 11 to 14, more specifically, sodium hydroxide (NaOH), sodium sulfate (NaSH), sodium azide (NaN 3 ), potassium hydroxide (KOH), Potassium sulfate (KSH) and potassium thiosulfate (KS 2 O 3 ) It may be one containing at least one bleaching agent selected from the group consisting of.
  • the concentration of the decolorant in the decolorizing solution is preferably about 1% to 30% by weight
  • the viscosity of the decolorizing solution may be about 1cps to 2000cps, preferably about 5cps to 2000cps.
  • the viscosity of the decolorizing solution satisfies the numerical range, the printing process can be performed smoothly, and can be prevented from diffusing or flowing down in the printed decolorizing solution according to the movement of the polarizing member in the continuous processing line, thereby This is because the discoloration region can be formed in a desired shape in the region.
  • the viscosity of the decolorizing solution may be appropriately changed depending on the printing device used, the surface characteristics of the polarizer.
  • the viscosity of the decolorizing solution when using the gravure printing method, may be about 1cps to 2000cps, preferably about 5cps to 200cps, when using the inkjet printing method, the viscosity of the decolorizing solution is about 1cps to 55cps, Preferably it may be about 5cps to 20cps.
  • the decolorizing solution may further include a thickener.
  • a thickener In order for the viscosity of the said bleaching solution to satisfy
  • the thickener improves the viscosity of the decolorizing solution, thereby suppressing the diffusion of the solution and helping to form a decolorizing region at a desired size and location.
  • a high viscosity solution is applied to a fast-moving polarizer, the difference in the relative velocity of the liquid and the polarizer during application is reduced to prevent the solution from spreading to an undesired area. Can be reduced to form a bleaching area of the desired position or size.
  • the thickener is not particularly limited as long as it has low reactivity and can increase the viscosity of the solution.
  • the thickener is polyvinyl alcohol-based resin, polyvinylacetoacetate-based resin, acetoacetyl group-modified polyvinyl alcohol-based resin, butenediol vinyl alcohol-based, polyethylene glycol-based resin and polyacrylamide It includes at least one selected from the group consisting of resins.
  • the thickener may be included in an amount of 0.5 wt% to 30 wt% with respect to the total weight of the decolorizing solution. Specifically, according to the exemplary embodiment of the present invention, the thickener may be included in an amount of 2.5 wt% to 15 wt% with respect to the total weight of the decolorizing solution. If the content of the thickener exceeds the above range, the viscosity is so high that the washing is not effective, and if the content of the thickener is too low, the viscosity is low to realize the discoloration area of the desired shape and size by the diffusion and flow of the liquid. Hard.
  • the decolorizing solution is 1% by weight to 30% by weight of a decolorant based on the total weight; Thickener 0.5% to 30% by weight; And 40% to 70% by weight of water.
  • composites of polyvinyl alcohols in which iodine and / or dichroic dyes have been dyed, can absorb light in the visible range, such as 400 nm to 800 nm.
  • the decolorizing solution is in contact with the polarizer, iodine and / or dichroic dyes absorbing light in the visible wavelength range present in the polarizer are decomposed, thereby decolorizing the polarizer to increase transmittance and lower polarization degree.
  • potassium hydroxide which is a decolorizing agent
  • iodine is decomposed by a series of processes as shown in Formulas 1 and 2 below.
  • potassium hydroxide directly decomposes the boric acid, as described in the following formula 3, to remove the cross-linking effect through hydrogen bonding of polyvinyl alcohol and boric acid Done.
  • the polarization function is eliminated in the region of about 400 nm to 800 nm, which is the visible light region of the polarizer, thereby increasing the overall transmittance and making the polarizer transparent.
  • the polarized function may be resolved by decomposing the arranged iodine complex that absorbs visible light into a monomolecular form that does not absorb visible light in order to make polarized light in the polarizer.
  • the method may further include washing with an alcohol or an acid solution after forming the decolorizing region. If the remaining decolorizing solution is not properly washed in the step of forming the decolorizing region, the solution may diffuse or remain on the polarizer, so that the decolorizing region may be formed in an undesired size and shape, and to form a decolorizing region having a fine size. It is difficult.
  • the alcohol in the case of the alcohol, it is easy to dry and can be easily removed, and can be suitably used in polarizers other than the decoloring region because it does not affect the transmittance or the degree of polarization.
  • the alcohol is preferably, but not limited to, ethanol, methanol, propanol, butanol, isopropyl alcohol, or a mixture thereof.
  • the residual decolorant which is mainly basic is neutralized with the acid solution, and is removed.
  • acid solution for example, aqueous acetic acid solution, adipic acid solution, boric acid solution, phosphoric acid solution, and lactic acid solution
  • Aqueous sulfuric acid solution, nitric acid solution or a mixed solution thereof may be used, but is not limited thereto.
  • the washing may be performed by immersing the polarizer in alcohol for 1 second to 180 seconds, more preferably 3 to 30 seconds, or by using a dispenser or ink jet or the like on a localized region which has been contacted with a decolorizing solution by using alcohol or an acid.
  • a method of applying a solution may be used.
  • a decolorizing plate including a decolorizing region in the method of manufacturing a polarizing plate including a decolorizing region according to an exemplary embodiment of the present invention, by using a decolorizing agent and then washing with an alcohol or an acid solution, the iodine compound and the salt formed by the decolorizing agent are washed away as described above, and the decolorizing region.
  • the content of iodine and iodine ion complexes is minimized. Therefore, the absorption of light of the residual iodine and iodine ion complex in the decoloring region is reduced, resulting in a more transparent effect.
  • the edge roughness of the discoloration portion is 30 ⁇ m or less, preferably 20 ⁇ m or less, and the closer to 0 ⁇ m or 0 ⁇ m, the better.
  • the edge roughness means the sum of the maximum outer difference and the maximum inner difference in the circle at the line drawn at every two degrees at any point of the discoloration part. 4 schematically illustrates a method of measuring the edge roughness.
  • the edge roughness is 30 ⁇ m or less, the shape of the discoloration portion becomes clearer. The value is closer to 0 mu m or 0 mu m. This means that when the discoloration portion is placed on the lens portion of the device such as the camera module, the function of the device is not deteriorated.
  • 5 and 6 respectively show a case in which a polarizer whose edge roughness satisfies 30 ⁇ m or less is used for the lens, and a polarizer in which the edge roughness of the discoloring part exceeds 30 ⁇ m is used for the lens. It shows the case of shooting. 5 and 6, in the case of an image photographed using a polarizer whose edge roughness of the discoloration part is greater than 30 ⁇ m in a lens, a portion corresponding to a side (parts indicated by circles in FIGS. 5 and 6) You can see the image of is blurred.
  • the edge roughness of the perforated portion of the mask film is 30 ⁇ m or less, preferably 20 ⁇ m or less, and the closer to 0 ⁇ m or 0 ⁇ m, the better.
  • the edge roughness of the perforated portion of the mask film means the sum of the maximum outside circumference and the maximum inside inside difference in the line drawn at every two degrees at an arbitrary point of the above perforation portion. That is, the closer the edge roughness of the perforated portion of the mask film is to 0 ⁇ m or 0 ⁇ m, the more the edge roughness of the discolored portion of the polarizer becomes 30 ⁇ m or less when the decolorizing process of the polarizer is performed using the mask film. Can be.
  • Such a polarizer does not degrade the function of the device in the lens portion of the device such as a camera module.
  • the method may further include forming an optical layer on at least one surface of the polarizer.
  • the optical layer may be a polymer film layer such as a protective film or a retardation film, a functional film layer such as a brightness enhancement film, or may be a functional layer such as a hard coating layer, an antireflection layer, or an adhesive layer.
  • the optical layer is formed on the other surface of the polarizer.
  • the optical layer is formed on a surface that is not provided with the protective film and the release film of the polarizer.
  • the optical layer may be directly attached or formed on the polyvinyl alcohol-based polarizer side, or may be attached on a protective film or other coating layer attached to one side of the polyvinyl alcohol-based polarizer.
  • the method of forming the optical layer may be formed by different methods according to the type of optical layer to be formed, for example, may be formed using optical layer forming methods well known in the art, the method This is not particularly limited.
  • the method may further include removing the release film after the forming of the discoloration region.
  • the removing of the release film may be performed by a method of peeling off the release film from the protective film. More specifically, the removing of the release film may be performed by a method of peeling the release film from the protective film using a peeling roll or the like.
  • the release film plays a role of suppressing sagging occurring in the decolorizing area forming step (stretching in the direction of the protective film), it is preferable that the release film is removed after the decolorizing area is formed.
  • the decoloring region of the present invention may mean a non-polarization part. Therefore, the polarizer which has a non-polarization part can be manufactured using the said mask film.
  • the polarizer is not particularly limited, and a film made of polyvinyl alcohol (PVA) containing a polarizer well known in the art, for example, iodine or a dichroic dye, is used.
  • PVA polyvinyl alcohol
  • the polarizer may have a thickness of at least 1 ⁇ m, at least 3 ⁇ m, at least 5 ⁇ m, at least 7 ⁇ m, or at least 10 ⁇ m, at least 20 ⁇ m. At the same time, the thickness of the polarizer may be 30 ⁇ m or less, preferably 25 ⁇ m or less.
  • the polarizer of the present invention as described above can be used in the manufacture of a polarizing plate. More specifically, the method of manufacturing a polarizing plate of the present invention comprises the steps of laminating the mask film on one surface of the polarizer; And decolorizing the portion corresponding to the perforated portion of the mask film and removing the mask film on one surface of the polarizer.
  • the method of manufacturing a polarizing plate of the present invention may include laminating a protective film of the polarizer on a surface from which the mask film is removed.
  • cellulose resins such as diacetyl cellulose, reacetyl cellulose, (meth) acrylic resins, cycloolefin resins, and polypropylenes.
  • Ester resins such as olefin resins, such as a polyethylene terephthalate resin, a polyamide resin, a polycarbonate resin, and copolymer resins thereof, can be used, but is not limited thereto.
  • the polarizing plate manufactured by the said manufacturing method of this invention is a polarizer which has the said non-polarization part; And a protective film of the polarizing plate on at least one surface of the polarizer.
  • the polarizer has at least one decolorization region, the decolorization region has a single transmittance of 80% or more and a polarization degree of 10% or less in the wavelength range of 400 nm to 800 nm, and maximum sagging of the decolorization region. It provides a polarizing plate having a sagging depth of 10 ⁇ m or less.
  • the area of at least one of the color fading areas may be 0.5 mm 2 or more and 500 mm 2 or less, preferably 0.5 mm 2 or more and 200 mm 2 or less.
  • the size of the non-polarization portion may be 0.5 mm 2 or more and 500 mm 2 or less, and the polarizing plate including the non-polarization portion having an edge roughness of the non-polarization portion is 30 ⁇ m or less.
  • the sagging means sagging in the direction of the protective film generated when the polyvinyl alcohol (PVA) polarizer is in contact with the decolorizing solution.
  • the adhesive is uniformly applied when laminating a protective film on the other side
  • the adhesive is uniformly applied when laminating a protective film on the other side
  • the shallower the depth of the sagging has the advantage that it can provide a polarizing plate with improved appearance.
  • the maximum sagging depth of the discoloration area may be 8 ⁇ m or less, 7 ⁇ m or less, or 6 ⁇ m or less.
  • the depth of the sagging may be measured using a white light optical profiler or a confocal laser scanning microscope (CLSM).
  • CLSM confocal laser scanning microscope
  • the depth of the sagging may mean a value obtained by subtracting the minimum value from the maximum value of the gap between the opposite surface of the protective film and the opposite surface of the protective film of the polarizer.
  • the depth of the sagging may mean the height difference between the discolored region and the non-discolored region in the protective film when the polarizing plate is placed on the plane.
  • a polarizing plate having a single transmittance of 80% or more in a wavelength range of 400 nm to 800 nm included in the visible light region, an arithmetic mean roughness Ra of 200 nm or less, and a polarization degree of 10% or less
  • the decolorizing region refers to a region formed through a process of selectively contacting a decolorizing solution with a part of a polyvinyl alcohol polarizer in which iodine and / or a dichroic dye is dyed.
  • the color fading region is preferably 80% or more, 90% or more, and still more preferably 92% or more in the wavelength range of 400 nm to 800 nm, more preferably 450 nm to 750 nm, which is the visible light region.
  • region is polarization degree 10% or less, and 5% or less. The higher the unitary transmittance of the decoloring area and the lower the degree of polarization, the better the visibility, thereby further improving the performance and image quality of the camera lens to be located in the area.
  • the unit transmittance of the region except the discoloring region of the polarizing plate is 40% to 47%, more preferably 42% to 47%. Furthermore, it is preferable that the polarization degree of the area
  • the arithmetic mean roughness Ra of the decoloring region may be 200 nm or less, specifically, 100 nm or less or 80 nm or less, more specifically, 50 nm or less.
  • the square root mean square roughness Rq of the discoloration region may be 200 nm or less, and specifically, 100 nm or less or 80 nm or less, more specifically, 50 nm or less.
  • the arithmetic mean roughness Ra is a value defined in JIS B0601-1994, which is extracted from the roughness curve by the reference length in the direction of the average line, and the absolute value of the deviation from the average line of the extract portion to the measurement curve is summed. The average value is shown, and the square mean square roughness Rq is defined in JIS B0601-2001.
  • the arithmetic mean roughness Ra and the square root mean square roughness Rq are measured by an optical profiler (Nanoview E1000, Nanosystem Co., Ltd.).
  • the haze is increased by refraction and reflection of light.
  • the roughness of the discoloration region satisfies the above range, the haze is sufficiently low and can have clear visibility.
  • the haze of the discoloration region is 3% or less, preferably 2% or less, and more preferably 1% or less.
  • the discoloration area is 0.1 to 0.5% by weight, preferably 0.1 to 0.35% by weight of the iodine and / or dichroic dye.
  • the region excluding the decolorizing region has a content of iodine and / or a dichroic dye in an amount of 1% by weight to 4% by weight, preferably 2% by weight to 4% by weight. .
  • the content of the iodine and / or the dichroic dye was measured using an optical X-ray analyzer (manufactured by Rigaku Electric Industries, Ltd., trade name "ZSX Primus II").
  • an optical X-ray analyzer manufactured by Rigaku Electric Industries, Ltd., trade name "ZSX Primus II”
  • the average weight percent per volume of 19.2 mm 3 was measured.
  • the discoloration area may be 0.005% to 40% of the area of the entire polarizing plate.
  • the image display device can be made using the polarizing plate according to the present invention as described above.
  • the present invention a display panel; And a polarizing plate according to the above-described exemplary embodiment attached to one or both surfaces of the display panel.
  • the display panel may be a liquid crystal panel, a plasma panel, and an organic light emitting panel.
  • the image display device may be a liquid crystal display (LCD), a plasma display (PDP), and an organic light emitting display (OLED). .
  • the image display device may be a liquid crystal display device including a liquid crystal panel and polarizing plates provided on both sides of the liquid crystal panel, wherein at least one of the polarizing plates is in accordance with the above-described embodiment of the present invention.
  • It may be a polarizing plate including a polarizer. That is, the polarizing plate comprises a polyvinyl alcohol polarizer in which iodine and / or dichroic dye is dyed and a protective film provided on at least one surface of the polyvinyl alcohol polarizer, in a wavelength region of 400 nm to 800 nm.
  • the type of liquid crystal panel included in the liquid crystal display device is not particularly limited.
  • a panel of a passive matrix type such as, but not limited to, a twisted nematic (TN) type, a super twisted nematic (STN) type, a ferroelectic (F) type, or a polymer dispersed (PD) type; Active matrix panels such as two-terminal or three-terminal; All known panels, such as an In Plane Switching (IPS) panel and a Vertical Alignment (VA) panel, can be applied.
  • the type of other components constituting the liquid crystal display device for example, the upper and lower substrates (for example, color filter substrates or array substrates) is not particularly limited, and configurations known in the art are not limited. Can be employed.
  • the image display apparatus may be an image display apparatus further comprising a camera module provided in the discoloration area of the polarizing plate.
  • a camera module provided in the discoloration area of the polarizing plate.
  • a polarizer having a thickness of 12 ⁇ m was prepared by performing a complementary color process in a 5 wt% KI solution after the stretching process and drying in an oven at 60 ° C. for 5 minutes. Then, a polarizing plate having a protective film was prepared by laminating a TAC film using an adhesive on one surface of the polarizer.
  • a pressure-sensitive adhesive was prepared by adding a small amount diluted to 50% in an acetate solution. Modulus of the pressure-sensitive adhesive can be adjusted according to the content of the crosslinking agent.
  • a pressure-sensitive adhesive layer was formed by coating an acrylic pressure-sensitive adhesive having a modulus of 0.3 MPa with a thickness of 15 ⁇ m on a PET protective film having a thickness of 50 ⁇ m, measured according to the measurement method described in the specification, and forming a pressure-sensitive adhesive layer on the pressure-sensitive adhesive layer by 15 ⁇ m.
  • the film was laminated to prepare a mask film. Subsequently, a hole (perforation part) having a diameter of 3 mm was punched out at 30 cm intervals using a CO 2 laser at an output of 10 W and a pulse repetition rate of 20 kHz.
  • a pressure-sensitive adhesive layer by coating a pressure-sensitive adhesive layer having a thickness of 15 ⁇ m on a PET protective film having a thickness of 50 ⁇ m with a modulus of 0.5 MPa, 1 MPa, 2 MPa, 3 MPa, 5 MPa, less than 0.1 MPa, and 8 MPa, respectively.
  • a polarizing plate having a localized discoloration area was prepared.
  • the pressure-sensitive adhesive composition having the modulus corresponding to Preparation Examples 1 to 7 was applied to the polyethylene release terephthalate film treated with silicone release, respectively, and dried at 90 ° C. for 4 minutes, and then aged for 7 days at 35 ° C. and 45% RH. After maturation, the adhesive film having a thickness of 25 ⁇ m was prepared, and after the release of the adhesive film, a plurality of layers were laminated and cut to prepare circular specimens having a thickness of 500 ⁇ m and a diameter of 8 mm.
  • Example 1 15 0.3 27 N OK
  • Example 2 15 0.5 25 N OK
  • Example 3 15 One 25 N OK
  • Example 4 15 2 20 N OK
  • Example 5 15 5 20 N OK Comparative
  • Example 1 15 ⁇ 0.1 70 Y OK Comparative Example 2 15 8 20 N NG
  • the thickness and modulus mean the thickness and modulus of the mask film adhesive
  • E means edge roughness.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
PCT/KR2019/010698 2018-08-22 2019-08-22 마스크 필름 및 이를 이용한 편광판의 제조방법 WO2020040570A1 (ko)

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