WO2011105805A2 - 편광판, 그 제조 방법 및 이를 이용한 화상표시장치 - Google Patents
편광판, 그 제조 방법 및 이를 이용한 화상표시장치 Download PDFInfo
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- WO2011105805A2 WO2011105805A2 PCT/KR2011/001260 KR2011001260W WO2011105805A2 WO 2011105805 A2 WO2011105805 A2 WO 2011105805A2 KR 2011001260 W KR2011001260 W KR 2011001260W WO 2011105805 A2 WO2011105805 A2 WO 2011105805A2
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- Prior art keywords
- adhesive layer
- group
- adhesive
- polarizing plate
- resin
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Classifications
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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
-
- 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
-
- 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
- G02F2202/00—Materials and properties
- G02F2202/28—Adhesive materials or arrangements
Definitions
- the present invention relates to a polarizing plate used in an image display device and a manufacturing method thereof, and more particularly, to a polarizing plate having an improved warpage phenomenon and a manufacturing method thereof.
- a polarizing plate is a polarizer having a structure in which a polyvinyl alcohol (hereinafter referred to as PVA) -based molecular chain is oriented in a constant direction and includes an iodine compound or a dichroic polarizing material. It consists of a structure in which a cellulose (TAC) film is bonded. At this time, the polarizer and the protective film
- the polarizing plate having the structure as described above is laminated with a protective film on one surface of the polarizing film through a water-based adhesive (lamination), dried to produce an intermediate polarizing plate, and then coated with an adhesive on the other side of the polarizing film and dried It is generally produced by performing a process to.
- the warpage phenomenon occurs from the intermediate polarizer state, and the warpage phenomenon tends to be more severe through the adhesive coating and drying.
- the warpage phenomenon is caused by the asymmetric polarizing plate structure, and is intensified due to the difference in adhesion between the adhesive and the adhesive applied to both sides of the polarizer.
- the present invention has been made to solve the above problems, and provides a polarizing plate having an improved warping phenomenon, a manufacturing method thereof, and an image display apparatus using the same.
- the present invention for this purpose; On one surface of the polarizing element
- the thickness of the first adhesive layer and / or the second adhesive layer is preferably 20 ⁇ 1000nm, more preferably about 50 ⁇ 300nm.
- the first adhesive layer and / or the second adhesive layer is preferably formed using an adhesive material having a viscosity of about 4 to 50 cP, more preferably, the first adhesive layer and / or the second adhesive layer is a polymerization degree of 500 ⁇ .
- the crab 1 adhesive layer and the crab 2 adhesive layer may be made of an adhesive of the same or different materials, more preferably made of an adhesive of the same material.
- the invention comprising: placing a protective film on one surface of the polarizing element and, where an adhesive layer on the other surface of the polarization "component; Interposing an adhesive between the protective film and the polarizing element and between the adhesive layer and the polarizing element, respectively; And it provides a polarizing plate manufacturing method comprising the step of plywood the protective film and the adhesive layer to the polarizing element via the adhesive, and drying. At this time, the drying is preferably 20 to 100 o C, more preferably from 40 to
- the present invention provides an image display device including the polarizing plate described above.
- the image display device may be a liquid crystal display (LCD) or an organic EL, and in the case of a liquid crystal display, the driving mode may be an in-plane switching (IPS) or a twisted nematic (TN) method. It may be a vertically aligned method (VA) or a FFS method (Fringe Field Switching).
- the polarizing plate of the present invention has less warpage than the conventional polarizing plate, and therefore
- the polarizing plate of the present invention can improve the durability and water resistance of the polarizing plate by using an adhesive resin containing a polyvinyl alcohol resin having an acrylic and a hydroxyl group as the adhesive.
- FIG. 1 is a view for explaining the structure of a conventional polarizing plate for IPS mode LCD.
- FIG. 2 is a view for explaining an embodiment of the polarizing plate of the present invention.
- FIG 3 is a view for explaining another embodiment of the polarizing plate of the present invention.
- FIG. 4 is a view for explaining an embodiment of the polarizing plate manufacturing method of the present invention.
- 5 is a photograph showing the curling degree of the polarizing plate of Comparative Example 1.
- FIG. 6 is a photograph showing the degree of curling of the polarizing plate of the embodiment.
- FIG. 7 is a photograph showing the water resistance test results of the polarizing plate of Example and Comparative Example 1. 8 is a photograph showing contrast ratio measurement results of polarizing plates of Example and Comparative Example 2.
- FIG. 8 is a photograph showing contrast ratio measurement results of polarizing plates of Example and Comparative Example 2.
- FIG. 10 is a photograph showing distribution of the inverse of the black luminance of the polarizing plates of Examples, Comparative Examples 2 and 3.
- FIG. 10 is a photograph showing distribution of the inverse of the black luminance of the polarizing plates of Examples, Comparative Examples 2 and 3.
- FIG. 11 is a graph for comparing the ratio of black luminance of the polarizing plates of Examples, Comparative Examples 2 and 3.
- FIG. 11 is a graph for comparing the ratio of black luminance of the polarizing plates of Examples, Comparative Examples 2 and 3.
- 12 is a graph showing the viscosity of the adhesive according to the degree of polymerization of the adhesive resin. 13 shows the viscosity of the adhesive according to the solid content of the adhesive resin
- the polarizing plate 100 of the present invention is a polarizing element 110
- the polarizing device 110 refers to an optical device for passing only light having a specific polarization state, and generally used by a polyvinyl alcohol polarizing film in which molecular chains containing an iodine compound or a dichroic dye are oriented in a predetermined direction. do.
- a polarizing film is produced by dyeing an iodine or a dichroic dye on a polyvinyl alcohol-based film, and then stretching and crosslinking in a constant direction.
- the degree of polymerization of the polyvinyl alcohol is not particularly limited, but considering the freedom of molecular movement and flexible mixing with the containing material, the polymerization degree is preferably about 1,000 to 10,000, more preferably ⁇ 500 to 5,000. good.
- the crab 1 adhesive layer 120 is formed on one surface of the polarizing element 110 to bond the protective film 130 and the polarizing element 110 to be described later.
- the second adhesive layer 140 is for attaching the polarizer 110 and the adhesive layer 150, is formed on the surface where the first adhesive layer 120 of the polarizer 110 is not formed. .
- the first adhesive layer 120 and the second adhesive layer 140 may have a thickness of about 20 nm to 1000 nm, preferably about 30 nm to 500 nm, and more preferably about 50 nm to 300 nm. If the thickness of the adhesive layer is less than 20 nm, problems in durability and adhesion may occur, and if the thickness exceeds 1000 nm, curling may occur. On the other hand, the material of the first adhesive layer 120 and / or the second adhesive layer 140 has a viscosity of about 4 cP to 50 cP, preferably 4 cP to 45 cP, more preferably 4 cP to 40 It is preferably an adhesive material on the order of cP.
- the adhesive viscosity is less than 4 cP
- the first adhesive layer 120 and / or the second adhesive layer 140 is preferably formed of an adhesive material having a degree of polymerization of about 500 ⁇ 1800, the solid content in the adhesive is preferably about 2 ⁇ 10wt%. Do.
- first adhesive layer 120 and the second adhesive layer 140 may be formed of an adhesive resin of the same or different materials, and more preferably, may be formed of an adhesive resin of the same material.
- adhesive resin which forms the said 1st adhesive bond layer 120 and the 2nd adhesive bond layer 140 should just be excellent in optical transmittance, and will not change with yellowing with time, and are not specifically limited.
- the first adhesive layer 20 is It may be formed by an adhesive resin including a polyvinyl alcohol-based resin, an acrylic resin, a vinyl acetate-based resin and / or a UV curable resin, wherein the adhesive resin may be a water-based adhesive or a solvent-free adhesive.
- the water-based adhesive agent containing polyvinyl alcohol-type resin More preferably, the polyvinyl alcohol-type resin which has an acryl group and a hydroxyl group (Hereafter, AH Or an adhesive resin containing a polyvinyl alcohol-based resin and a compound having an acrylic group and an epoxy group.
- AH—A PVA resin or an adhesive resin comprising a polyvinyl alcohol-based resin and a compound having an acrylic group and an epoxy group has excellent adhesion, water resistance and moisture resistance as well as excellent solubility in water compared to other conventional adhesives.
- the AH-PVA resin used in the present invention may include a repeating unit represented by the following formula la, and a repeating unit represented by the following formula lb, and optionally, a repeating unit represented by the following formula lc It may further comprise.
- R 1 is substituted or unsubstituted C-C2o alkanediyl (alkandiyl); Substituted or unsubstituted 1 to 7 membered ring compound; Substituted or unsubstituted 1 to 7 membered heterocyclic compound comprising a hetero atom selected from the group consisting of N, S and 0; Substituted or unsubstituted C 6 -C 14 aromatic compound; Or a substituted or unsubstituted 1 to 7 membered heteroaromatic compound comprising a hetero atom selected from the group consisting of N, S and 0,
- R 2 is a substituted or unsubstituted d-Cso alkyl group
- Substituted black is unsubstituted 1 to 7 membered ring compound
- Substituted black is unsubstituted 1 to 7 membered heterocyclic compound comprising; Substituted or unsubstituted C 6 -C 14 aromatic compound; Or a substituted or unsubstituted 1 to 7 membered heteroaromatic compound comprising a hetero atom selected from the group consisting of N, S and 0,
- the substituent may be a d to C 20 alkyl group or a halogen atom selected from the group consisting of F, CI, Br and I,
- R 3 may be an acetoacetyl group, a carboxylic acid group, an acryl group or a urethane group.
- the AH-PVA resin includes a repeating unit represented by the following formula la, the repeating unit represented by the following formula lb, wherein n is an integer of 480 to 1700, m is an integer of 10 to 900, n Preferably, + m is an integer of 500 to 1800.
- the AH-PVA resin includes a repeating unit represented by the following formula la, a repeating unit represented by the following formula lb, and a repeating unit represented by the formula lc
- N is an integer from 480 to 1700
- m is an integer from 10 to 900
- 1 is an integer from 1 to 80
- n + m is an integer from 500 to 1800
- n + 1 is an integer from 490 to 1700
- the repeating units represented by the formula la, lb and lc may be randomly arranged in the AH-PVA resin polymer.
- the acrylic group is preferably introduced in an amount of 0.1 to 50 mol%, preferably 0.1 to 20 mol, and more preferably 0.1 to 10 mol% of the PVA resin. If the acrylic group content in the PVA resin is less than 0.1mo 3 ⁇ 4, it is not preferable in that there is no effect of increasing the adhesion, moisture resistance and water resistance by introducing the acrylic group, and when it exceeds 50mo ' l%, the solubility in water decreases and the adhesion decreases. Because you can.
- the AH-PVA resin is obtained by modifying a polyvinyl alcohol-based resin with a compound having an epoxy group and an acryl group. In this case, the compound of Formula 3 may be used as the compound having an epoxy group and an acrylic group.
- R 1 and R 2 in Formula 3 are the same as defined above.
- the AH-PVA resin of the present invention can be prepared by the following reaction. ⁇
- Formula m m. mm Reaction Scheme 1 is a scheme illustrating a process of converting a conventional polyvinyl alcohol-based resin to AH-PVA resin, and the number of repeating units is not described.
- the reaction scheme is a scheme illustrating a process of converting a conventional polyvinyl alcohol-based resin to AH-PVA resin, and the number of repeating units is not described. The reaction scheme
- Formula 2 in 1 is a polyvinyl alcohol-based resin, used in the present invention
- the polyvinyl alcohol-based resin is not particularly limited, and any polyvinyl alcohol-based resin known in the art, such as an unmodified polyvinyl alcohol resin or an acetoacetyl group, which is known in the art to be used in an adhesive of a conventional polarizing element and a protective film. ,
- Polyvinyl alcohol resins modified with at least one group selected from the group consisting of carboxylic acid groups, acrylic groups and urethane groups can be used.
- the repeating unit lc may not be present in Chemical Formula 2.
- a compound having a polyvinyl alcohol of Formula 2 hereinafter referred to as 'PVA'
- 'PVA' a compound having a polyvinyl alcohol of Formula 2
- R 3 an epoxy group and an acryl group of PVA
- the reaction results in the introduction of an acryl group into the PVA resin and at the same time a hydroxyl group (-0H).
- polyvinyl alcohol is dissolved in water with a resin (Formula 2) and a compound having an epoxy group and an acryl group (Formula 3) in about 25 to
- a polyvinyl alcohol-based resin (Formula 1) in which an acryl group is introduced and -0H group is formed at the same time can be obtained. That is, acryl groups are introduced into the backbone of the resin by the reaction and -0H is formed.
- a polyvinyl alcohol resin is obtained, and the polyvinyl alcohol-based resin in which an acryl group is introduced into a single resin backbone and -0H is formed is not only excellent in solubility in water but also excellent in adhesion, water resistance and moisture resistance.
- the AH-PVA resin is preferably a copolymerization degree of 500 to 1800.
- the degree of copolymerization is less than 500, a large amount of solids should be added because of low viscosity at low solids. In the case of more than 1800, a small amount of solids (PVA resin) should be added because of high viscosity at the time of adhesive manufacture. It is undesirable in terms of losing.
- an adhesive resin including a compound having a polyvinyl alcohol-based resin, an epoxy group, and an acryl group may be used instead of the AH-PVA resin as the material for forming the first adhesive layer and / or the second adhesive layer of the present invention.
- the content of the compound having an epoxy group and an acrylic group is 0.001 to 10 parts by weight, based on 100 parts by weight of polyvinyl alcohol-based resin,
- the polyvinyl alcohol resin used for the adhesive resin containing the polyvinyl alcohol resin and the compound which has an epoxy group and an acryl group is also not specifically limited as mentioned above, Any polyvinyl alcohol-type resin known in the art, for example, an unmodified polyvinyl alcohol resin, an acetoacetyl group, a carboxylic acid group, a polyvinyl alcohol resin modified to at least one group selected from the group consisting of urethane groups, and the like can be used.
- the polyvinyl alcohol-based resin is preferably a polymerization degree of 500 to 1800. If the degree of copolymerization is less than 500, the viscosity is low at low solids in the preparation of the adhesive,
- a large amount of solid content (PVA resin) should be added, and when the adhesive is more than 1800, a small amount of solid content (PVA resin) should be added since the viscosity is high, which is undesirable in that the adhesive strength is lowered.
- the compound having the epoxy group and the acryl group preferably, the compound of Formula 3 may be used.
- the content of the compound having an epoxy group and an acrylic group is less than 0.001 parts by weight, there is no effect of increasing adhesion, moisture resistance, and water resistance by introducing an acrylic group.
- the content of the compound exceeds 10 parts by weight, the adhesive for a polarizing plate is uniform due to a decrease in solubility in water. It is not obtained because it is not obtained and solution stability and adhesion are low.
- a curing initiator may be further added to the adhesive resin used in the present invention as needed.
- Curing initiators include AIBN (2,2'-azo-bis (isobutyronitrile)) based initiators, persulfate based initiators, Ciba-Geigy Darocure and / or
- AIBN-based initiators include 2,2'-azobis [2— (2-imidazoline-2-yl) propane] dihydrochloride, 2,2'-azobis [ 2- (2-imidazolin-2-yl) propane] disulfate dihydrate, 2,2'-azobis [ ⁇ 2-carboxyethyl) -2-methylpropionamide], 2, 2'-azobis [ 2- (3,4,5, 6-tetrahydropyrimidin-2-yl) propane] dihydrochloride, 2, 2'-azobis ⁇ 2- [1- (2-hydroxyethyl) -2-yl ] Propane ⁇ dihydrochloride, 2,2'-azobis ⁇ 2-methyl-N- [2- (hydroxybutyl)] propionamide ⁇ , 2,2'-azobis [2-
- Initiators of Ciba-Geigy Co., Ltd. include, but are not limited to, but are not limited to, for example, hydroxy-l_ [4- (hydroxyspecific) phenol] -2-methyl-1-propane (Darocure 2959), 2-hydride Hydroxy-2-methyl-1-phenylpropane-1-one (Darocure 1173), 1— (4-isopropylphenyl) -2-hydroxythoxy-2- Methylpropane-1-one (Darocure 1116), bis- (2,6-dimethoxybenzoyl) -2,4,4-trimethylpentyl phosphine oxide and 2-hydroxy-2-methyl-1-phenylpropane 25:75 blend of -1-one (tradename Irgacure 1700), 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-di-2methyl-1-propane-1-one ( Irgacure 2959), 1-hydroxycyclonucle
- the curing initiator may be added at up to 10% by weight based on the total weight of the adhesive resin. Although the lower limit of the amount of the curing initiator is optionally added as needed, the lower limit of the added amount is not limited, but preferably 0.01-10% by weight, more preferably 0.01-1% by weight, based on the total weight of the adhesive. have. 0.01 weight of curing initiator additions? If it is less than 3 ⁇ 4, the effect of adding a curing initiator is unsatisfactory.
- the protective film 130 is a film for protecting the polarizing element 110, is attached to the upper portion of the first adhesive layer 130.
- the protective film 130 any polymer film having excellent optical transparency, mechanical strength, thermal stability, isotropy, adhesiveness with a PVA polarizer, and the like may be used. Examples of protective films include, but are not limited to, polyethylene terephthalate and polyethylene naphthalate.
- Styrene-based polymers such as polyester polymers, polystyrene, acrylonitrile and styrene copolymers, polyacetyl cellulose, triacetyl salose
- Acrylic polymers such as cellulose-based polymers, polyethersulfone polymers, polycarbonate-based polymers or polymethyl methacrylates, polyolefin-based polymers such as polyethylene, polypropylene, copolymers of ethylene and propylene, nylon or aromatic polyamides; Amide polymers, imide polymers, sulfone polymers, polyether sulfone polymers, polyether ether ketone polymers, polyphenylene
- a film made of a sulfide polymer, a vinyl alcohol polymer, a vinylidene chloride polymer, a vinyl butyral polymer, an arylate polymer, a polyoxy methylene polymer, an epoxy polymer or a mixture of these polymers can be used.
- cellulose ester triacetyl salose film (TAC film), cellulose propionate, cellulose acetate propionate, salose
- Cellulose based films such as diacetate, cellulose acetate butyrate film, polycarbonate based film (PC film), polystyrene based film, polyarylate based film, norbornene resin based film and polysulfone based film are transparent and mechanical. It is preferable at the point that there is no property and optical anisotropy.
- the triacetyl cellulose film (TAC film) and the carbonate film (PC film) are more preferable because they are easy to form and have excellent processability ⁇ 1, and TAC films are most preferred due to polarization characteristics or durability.
- the protective film is the adhesion and adhesion to the polarizing device to which the protective film is bonded It can be surface modified to improve.
- the surface treatment include, but are not limited to, corona treatment, glow discharge treatment, flame treatment, acid treatment, alkali treatment, plasma treatment, ultrasonic treatment and ultraviolet irradiation treatment.
- a method of providing an undercoat layer on the protective film may be used to improve adhesion.
- the adhesive layer 150 is for attaching the polarizing plate 100 to the panel of the image display device, it is formed under the second adhesive layer 140.
- an acrylic copolymer, an epoxy resin, a polyurethane resin, a silicone resin, a polyether resin, a polyamide resin, a polyvinyl alcohol resin, or the like may be used alone or in combination.
- an acrylic copolymer may be preferably used.
- the adhesive layer 150 may be formed in a single layer structure as shown in FIG. 2, but as shown in FIG. 3, the first adhesive layer 150a and the second adhesive layer 150b are different from each other. It can be made of).
- the modulus of the first adhesive layer is defined as that of the two adhesive layers.
- the protection function of the PVA polarizer can be further improved.
- the PVA polarizer can be protected from external environmental factors such as heat and moisture, which degrade the polarization function of the PVA polarizer. Can be given.
- by adding a chemical functional group to the pressure-sensitive adhesive constituting the first adhesive layer may be improved adhesion and water resistance to the PVA polarizer.
- the first adhesive layer has a modulus of about 1 to 500 MPa, preferably about 50 to 450 MPa, more preferably about 100 to 400 MPa
- the second adhesive layer is
- Modulus is 0.01 to 0.5 MPa, preferably 0.01 to 0.45 MPa, more preferably
- the adhesive layer having a high modulus value is preferably attached to the second adhesive layer.
- Adhesive layer with high modulus has PVA from external environmental factors such as heat and moisture
- the manufacturing method of the polarizing plate of this invention as mentioned above is demonstrated.
- the method of manufacturing a polarizing plate of the present invention comprises the steps of: (i) placing a protective film on one surface of the polarizing element, and placing an adhesive layer on the other surface of the polarizing element ( ⁇ ) between the protective film and the polarizing element, and the adhesive layer; Interposing an adhesive between the polarizing elements, and (iii) laminating the protective film and the adhesive layer to the polarizing element through the adhesive and drying the adhesive.
- the polarizing element 110 is a molecular chain containing an iodine-based compound ⁇ dichroic dye is aligned in a certain direction
- the protective film 130 is a polyester polymer such as polyethylene terephthalate, polyethylene naphthalate, styrene polymer such as polystyrene, acrylonitrile and styrene copolymer, polyacetyl cellulose, triacetyl
- Cellulose polymers such as cellulose, polyether sulfone polymers,
- Acrylic polymer such as polycarbonate polymer or polymethyl methacrylate, polyolefin polymer such as polycetylene, polypropylene, copolymer of ethylene and propylene, amide polymer such as nylon or aromatic polyamide, imide polymer, alcohol Phon polymer, polyether sulfone polymer, polyether ether ketone polymer, polyphenylene sulfide polymer, vinyl alcohol polymer, vinylidene chloride polymer, vinyl butyral polymer, arylate polymer, polyoxy methylene polymer Epoxy polymers or films made of mixtures of these polymers may be used.
- the adhesive layer 150 may be optically transparent, and may exhibit suitable viscoelasticity or adhesive properties, and the material thereof is not particularly limited.
- the adhesive layer 150 may be used alone or mixed with an acrylic copolymer, an epoxy resin, a polyurethane resin, a silicone resin, a polyether resin, a polyamide resin, a polyvinyl alcohol resin, transparency, In consideration of weather resistance, durability and adhesive properties, among these, an acrylic copolymer may be preferably used.
- the adhesive layer 150 may be a pressure-sensitive adhesive sheet formed by coating an adhesive on a release film.
- the pressure-sensitive adhesive sheet may be manufactured by coating the pressure-sensitive adhesive resin on a release film and then curing the same through a method such as drying, thermal curing, chemical curing, thermal melting, or light curing.
- the adhesive layer 150 has a different modulus
- It may be composed of a first adhesive layer 150a and a crab two adhesive layer 150b. At this time
- the first adhesive layer has a modulus of 1 to 500 MPa, preferably 50 to 450 MPa, and more
- the second adhesive layer has a modulus of 0.01 to 0.5 MPa, preferably 0.01 to 0.45 MPa, and more preferably about 0.01 to 0.4 MPa.
- an adhesive agent is interposed between the said protective film and a polarizing element, and between the said adhesion layer and a polarizing element, respectively.
- the adhesive interposed between the protective film and the polarizing element and the adhesive interposed between the adhesive layer and the polarizing element may be the same or different materials, the thickness of the adhesive layer is about 20 nm to 1000 nm.
- the method may be performed by applying an adhesive to both surfaces of the polarizing element, or by applying a pressure-sensitive adhesive on the surface facing the polarizing element of the protective film and the adhesive layer, respectively.
- the adhesive may have an adhesive force capable of adhering the polarizing element and the protective film or the polarizing element and the adhesive layer, and may be excellent in optical transmittance and no change in yellowing over time. It doesn't work.
- an adhesive including at least one selected from the group consisting of polyvinyl alcohol-based acrylic resins, vinyl acetate-based resins, and UV-curable adhesive resins may be used, and preferably, polyvinyl alcohol-based resins.
- An adhesive may be used, and most preferably, an adhesive including a polyvinyl alcohol-based resin containing an acrylic group and a hydroxy group may be used.
- the plywood When the adhesive is interposed through the above process, the protective film and the adhesive layer are laminated to the polarizer through the adhesive and dried.
- the plywood may be made sequentially or at the same time, it is more preferably made at the same time in terms of production efficiency.
- the drying temperature depending on the adhesive used, is usually about 20 to 100 ° C, more preferably about 40 to 90 ° C.
- this step is preferably performed in an environment with less floating foreign matter, or it is preferable to perform the foreign material removal process before the plywood step.
- the foreign material removal method should just be a thing which does not adversely affect a polarizing element, a protective film, and an adhesion layer, and is not specifically limited.
- a separate cleaning section is added during the manufacturing process of the polarizing plate to wash away any foreign substances on the surface of the film in a cleaning tank filled with water, or to incline the film advancing direction during the process to remove water from the inclined surface.
- a gas pressure injection such as oxygen or nitrogen, or to blow the foreign material by blowing the gas pressure directly.
- the amount of foreign matter on the contact surface is preferably lg / m 2 or less per unit area, more preferably about 0.5 g / m 2 or less.
- the amount of the foreign matter refers to the weight of the foreign matter present per unit surface area.
- the warpage phenomenon is remarkably reduced as compared with the conventional polarizing plate, and since the amount of warpage is reduced overall even after plywood to the image display device, the image quality deterioration is reduced compared with the case of using the conventional polarizing plate.
- the system 1 and / or the second adhesive layer is formed of an adhesive resin containing an AH-PVA resin or a compound containing a PVA resin and an acrylic group and an epoxy group, the adhesive force, moisture resistance and water resistance of the polarizing plate may be improved. The effect can be obtained.
- the polarizing plate of the present invention can be usefully used as an image display device, for example, a polarizing plate for a liquid crystal display device, an anti-reflective polarizing plate of an organic EL.
- the liquid crystal display may be driven in any kind of driving mode, for example, in-plane switching (IPS), twisted nematic (TN), and vertical alignment.
- IPS in-plane switching
- TN twisted nematic
- VA Vertically Aligned
- FFS Frringe Field Switching
- Polyvinyl alcohol (PVA) film (manufactured by Kuraray Co. Ltd., polymerization degree: 2400) was subjected to a washing bath, a swelling bath, dyed in an aqueous solution containing 1 2 and KI, and then 5 times in an aqueous solution containing boric acid and KI. It extended to and obtained the polarizer.
- PVA Polyvinyl alcohol
- TAC triacetyl cellulose
- the pressure-sensitive adhesive film which is positioned and protected by the PE release film, is placed on the other side.
- the pressure-sensitive adhesive film is composed of two layers of pressure-sensitive adhesive layer has a modulus value of 270MPa, 0.02MPa.
- Polyvinyl alcohol (PVA) film (manufactured by Kuraray Co. Ltd., polymerization degree: 2400) was subjected to a washing bath, a swelling bath, dyed in an aqueous solution containing 1 2 and KI, and then 5 times in an aqueous solution containing boric acid and KI. It extended to and obtained the polarizer.
- PVA Polyvinyl alcohol
- a triacetylsalose (TAC) film was placed on only one side of the polarizer, a PVA-based adhesive solution was added and laminated with a laminator, followed by drying at 80 ° C. for 8 minutes, and only one side of the triacetylcelose (TAC).
- TAC triacetylsalose
- a polarizing plate is laminated.
- the polarizer in which the triacetylsalose (TAC) film was not laminated The pressure-sensitive adhesive film from which the release film was removed without the adhesive on the surface was laminated with a laminator to prepare a final polarizing plate.
- the pressure-sensitive adhesive film is composed of two layers of pressure-sensitive adhesive layer of modulus values of 270 MPa and 0.02 MPa, respectively. Comparative Example 2
- Polyvinyl alcohol (PVA) film (manufactured by Kuraray Co. Ltd., polymerization degree: 2400) was subjected to a washing bath, a swelling bath, dyed in an aqueous solution containing 1 2 and KI, and then 5 times in an aqueous solution containing boric acid and KI. It extended to and obtained the polarizer.
- PVA Polyvinyl alcohol
- TAC triacetyl cellulose
- the pressure-sensitive adhesive film consists of a pressure-sensitive adhesive layer having a modulus value of 0.01 MPa. Comparative Example 3
- Polyvinyl alcohol (PVA) film (manufactured by Kuraray Co. Ltd., polymerization degree: 2400) was rinsed in an aqueous solution containing 1 2 and KI after washing with a washing tank, a swelling tank, and then 5 times in an aqueous solution containing boric acid and KI. It extended to and obtained the polarizer.
- PVA Polyvinyl alcohol
- TAC triacetyl cellulose
- FIG. 5 is a photograph of a polarizing plate manufactured by Comparative Example 1
- FIG. 6 is a photograph of a polarizing plate manufactured by Example.
- FIG. 5 and FIG. 6 in the case of the polarizing plate sample of Comparative Example 1, curls are severely generated, whereas in the polarizing plate sample of the example, curls are hardly generated.
- Experimental Example 2 Water Resistance Evaluation
- Example and Comparative Example 1 After cutting the polarizing plates prepared in Example and Comparative Example 1 to a size of 5cm horizontally and vertically, respectively, laminated on a 1.1mm thick glass substrate, and then immersed in a 60 ° C water bath to perform a water resistance evaluation.
- CR Contrast ratio
- FIG. 8 it can be seen that when the polarizing plate of the example is mounted, the contrast ratio is better than when the polarizing plate of the comparative example 2 is mounted.
- FIG. 9 is a graph illustrating contrast ratios measured when the polarizing plate of the embodiment is mounted and when the polarizing plate of Comparative Example 2 is mounted. As shown in FIG. 9, the CR of the polarizing plate of the polarizing plate of Comparative Example 2 is shown. It can be seen that the increase of about 50%.
- Experimental Example 4 Black luminance measurement
- the polarizers produced by Examples, Comparative Examples 2 and 3 were mounted on a transverse electric field (In— Plane Switching, IPS) image display device, and then reciprocal of black luminance (L b ), that is, L b — The distribution of 1 was measured.
- CR is L b, which represents a ratio, i.e., L w / L b of the white luminance (white luminance,) and black luminance (black luminance, L b) that the image display apparatus implemented, sensitive to the optical properties of the polarizing plate Considering only 1 / L b , that is, L b — 1
- FIG. 10 shows the polarizing plates produced in Examples, Comparative Examples 2 and 3
- a polarizing plate having the same structure as in Example 1 was prepared using an adhesive resin composition having a viscosity as shown in the following [Table 1], solubility, drying efficiency, processability and Orthogonal transmittance ratio was measured.
- the solubility was visually measured by the degree of mixing of the adhesive resin and the solvent, and 0 when the adhesive resin and the solvent were completely mixed and homogeneous, and X when the phase separation between the adhesive resin and the solvent occurred.
- the processability indicates the degree of bending of the adhesive during the application of the adhesive, and indicates the case where the adhesive cannot be broken and the operation is impossible.
- the drying efficiency was measured by observing whether black spots due to incomplete drying occurred on the surface of the polarizing plate after 5 minutes of drying.
- 3 ⁇ 4 / 1; 3 is a value showing the relative ratio of the orthogonal transmittance (Tc) produced using other samples based on the orthogonal transmittance (Tc, s) of the polarizing plate produced using an adhesive resin of viscosity 12.7cP.
- Tc / T cs value is 1 or more, the optical properties compared to the embodiment
- Vulnerable if the value is less than 1 means that the optical properties are superior to the embodiment.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Polarising Elements (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
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Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012553823A JP5811412B2 (ja) | 2010-02-23 | 2011-02-23 | 偏光板、その製造方法及びこれを利用した画像表示装置 |
| CN201180010796.3A CN102770789B (zh) | 2010-02-23 | 2011-02-23 | 偏光板、其制备方法、以及使用该偏光板的图像显示装置 |
| US13/580,624 US20120305181A1 (en) | 2010-02-23 | 2011-02-23 | Polarizing plate, method for fabricating same, and image display apparatus using same |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2010-0016307 | 2010-02-23 | ||
| KR20100016307 | 2010-02-23 | ||
| KR10-2011-0015583 | 2011-02-22 | ||
| KR1020110015583A KR101272467B1 (ko) | 2010-02-23 | 2011-02-22 | 편광판, 그 제조 방법 및 이를 이용한 화상표시장치 |
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| Publication Number | Publication Date |
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| WO2011105805A2 true WO2011105805A2 (ko) | 2011-09-01 |
| WO2011105805A3 WO2011105805A3 (ko) | 2012-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2011/001260 Ceased WO2011105805A2 (ko) | 2010-02-23 | 2011-02-23 | 편광판, 그 제조 방법 및 이를 이용한 화상표시장치 |
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| WO (1) | WO2011105805A2 (ko) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111837072A (zh) * | 2018-06-22 | 2020-10-27 | 株式会社Lg化学 | 定量粘合剂是否从偏光板泄漏或粘合剂的泄漏程度的方法 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3368524B2 (ja) * | 1996-12-27 | 2003-01-20 | 住友化学工業株式会社 | 偏光板 |
| JP2002196141A (ja) * | 2000-12-26 | 2002-07-10 | Sumitomo Chem Co Ltd | 薄型光学フィルム積層体、その製造方法、及びそれの液晶表示素子への適用 |
| KR100787721B1 (ko) * | 2006-07-25 | 2007-12-24 | 제일모직주식회사 | 박막 웨이퍼의 가공에 적합한 다이싱 다이 본드 필름 |
| JP5189507B2 (ja) * | 2008-01-28 | 2013-04-24 | 日東電工株式会社 | 粘着型偏光板、画像表示装置およびそれらの製造方法 |
-
2011
- 2011-02-23 WO PCT/KR2011/001260 patent/WO2011105805A2/ko not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111837072A (zh) * | 2018-06-22 | 2020-10-27 | 株式会社Lg化学 | 定量粘合剂是否从偏光板泄漏或粘合剂的泄漏程度的方法 |
| CN111837072B (zh) * | 2018-06-22 | 2023-02-21 | 杉金光电(苏州)有限公司 | 定量粘合剂是否从偏光板泄漏或粘合剂泄漏程度的方法 |
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| WO2011105805A3 (ko) | 2012-01-12 |
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