WO2016117659A1 - Polariseur et procédé de production associé - Google Patents

Polariseur et procédé de production associé Download PDF

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Publication number
WO2016117659A1
WO2016117659A1 PCT/JP2016/051751 JP2016051751W WO2016117659A1 WO 2016117659 A1 WO2016117659 A1 WO 2016117659A1 JP 2016051751 W JP2016051751 W JP 2016051751W WO 2016117659 A1 WO2016117659 A1 WO 2016117659A1
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WIPO (PCT)
Prior art keywords
polarizer
meth
crosslinking
transmittance
producing
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PCT/JP2016/051751
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English (en)
Japanese (ja)
Inventor
天煕 趙
容鉉 權
根善 陸
崔　允碩
公彦 矢可部
佑介 北河
Original Assignee
住友化学株式会社
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Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to CN202111602512.1A priority Critical patent/CN114815028A/zh
Priority to CN201680006230.6A priority patent/CN107209312A/zh
Priority to KR1020177022807A priority patent/KR102530227B1/ko
Priority to JP2016570707A priority patent/JP6893416B2/ja
Publication of WO2016117659A1 publication Critical patent/WO2016117659A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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
    • 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
    • G02B5/3041—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 comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—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 comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements

Definitions

  • the present invention relates to a polarizer and a method for manufacturing the same.
  • Polarized light used in various image display devices such as liquid crystal display (LCD), electroluminescence (EL) display, plasma display (PDP), field emission display (FED), organic light emitting diode (OLED), etc.
  • the plate generally includes a polarizer in which an iodine compound or a dichroic polarizing material is adsorbed and oriented on a polyvinyl alcohol (PVA) film, and a polarizer protective film is laminated on one surface of the polarizer.
  • PVA polyvinyl alcohol
  • the other surface of the polarizer has a multilayer structure in which a polarizer protective film, an adhesive layer bonded to a liquid crystal cell, and a release film are sequentially laminated.
  • a polarizer constituting a polarizing plate is applied to an image display device, and is required to have high transmittance and degree of polarization in order to provide an image excellent in hue reproducibility.
  • various image display devices such as liquid crystal display devices may be used at high temperatures for a long period of time.
  • the demand for improvement in durability as well as improvement in polarization performance and optical performance increased, and as a result, the conditions for the performance of the polarizing plate became very severe.
  • image display devices having characteristics suitable for various environments and applications are currently required, and optical durability including color change under high temperature and high humidity conditions, and high contrast through high orientation and high transmission are required. It has been.
  • Korean Patent No. 2009-70085 discloses a method of manufacturing a polarizer, but does not present an alternative to the above problem.
  • An object of the present invention is to provide a polarizer having improved color durability and excellent polarization degree.
  • Another object of the present invention is to provide a method capable of producing a polarizer having improved color durability and excellent polarization degree.
  • TMD 700 is a transmittance at a wavelength of 700 nm obtained when the polarizer is disposed in a state where the absorption axis of the polarizer is orthogonal to the linearly polarized light of the measurement light
  • TTD, 700 is the polarization Is a transmittance at a wavelength of 700 nm obtained when the polarizer is placed in a state where the absorption axis of the polarizer is parallel to the linearly polarized light of the measuring light, and these units are all%.
  • T MD, 480 is a transmittance at a wavelength of 480 nm obtained when the polarizer is disposed in a state where the absorption axis of the polarizer is orthogonal to the linearly polarized light of the measurement light
  • T TD, 480 is the transmittance at a wavelength of 480 nm obtained when the polarizer is placed in a state where the absorption axis of the polarizer is parallel to the linearly polarized light of the measurement light, and these units are in%. is there.
  • the polarizer includes a metal salt.
  • the metal salt is at least one selected from the group consisting of zinc nitrate, copper nitrate, aluminum nitrate, magnesium nitrate, and zinc acetate.
  • the metal salt is contained in 0.05 to 1.5% by weight with respect to the total weight of the polarizer.
  • a polarizing plate comprising a protective layer on at least one surface of the polarizer according to any one of 1 to 4 above.
  • An image display device comprising the polarizing plate described in 5 above.
  • the staining solution contains a boric acid compound;
  • a method for producing a polarizer wherein a crosslinking solution and a complementary color solution each containing a metal salt are used in the crosslinking and complementary color steps.
  • the metal salt is at least one selected from the group consisting of zinc nitrate, copper nitrate, aluminum nitrate, magnesium nitrate, and zinc acetate.
  • T MD, 700 is a transmittance at a wavelength of 700 nm obtained when the polarizer is disposed in a state where the absorption axis of the polarizer is orthogonal to the linearly polarized light of the measurement light
  • T TD, 700 is a transmittance at a wavelength of 700 nm obtained when the polarizer is arranged in a state where the absorption axis of the polarizer is parallel to the linearly polarized light of the measurement light, and these units are all in%.
  • T MD, 480 is a transmittance at a wavelength of 480 nm obtained when the polarizer is disposed in a state where the absorption axis of the polarizer is orthogonal to the linearly polarized light of the measurement light
  • T TD, 480 is the transmittance at a wavelength of 480 nm obtained when the polarizer is placed in a state where the absorption axis of the polarizer is parallel to the linearly polarized light of the measurement light, and these units are in%. is there.
  • the polarizer of the present invention has improved color durability and can minimize color change even when exposed to high temperature conditions for a long time.
  • the polarizer of the present invention is excellent in the degree of polarization.
  • the method of the present invention can improve the color durability and can produce a polarizer having an excellent degree of polarization.
  • the present invention relates to a polarizer that satisfies Equation 1 and has improved color durability and excellent optical characteristics, and a method for manufacturing the same.
  • PVA (polyvinyl alcohol) -based polarizing element comprises a PVA-I 5 complex, PVA-I 5 complex by high temperature and high humidity PVA-I 5 complex region under conditions is reduced PVA-I 5 complex becomes unstable Is decomposed and the PVA-I 5 complex content in the region that absorbs light of 700 nm or more is decreased. As a result, the stability of the dichroic substance complex is lowered and the polarizer can be discolored (decrease in durability).
  • PVA-based polarizer includes also PVA-I 3 complex, PVA-I 3 complex contributes to the expression of the polarization degree.
  • iodine is added iodine molecule or iodine salt, chemical bath (dyeing bath, crosslinking bath and / or complementary color tank) by specific environmental or condition in I 3 - or I 5 - to transform because so is to form a PVA complexes, I 3 - or I 5 - it is difficult to directly control the content (concentration) of.
  • A700 of the polarizer is related to the PVA-I 5 complex content
  • A480 is related to the PVA-I 3 complex content
  • the ratio of A700 to A480 is Focusing on the fact that the polarizer is an indicator that can show the PVA-I 5 complex content and the PVA-I 3 complex content that keeps the degree of polarization good and does not change color even under high temperature and high humidity conditions, Was devised.
  • the polarizer of the present invention satisfies the following formula 1 to maintain the polarization degree, optical characteristics, and durability very well.
  • T MD, 700 is a transmittance at a wavelength of 700 nm obtained when the polarizer is disposed in a state where the absorption axis of the polarizer is orthogonal to the linearly polarized light of the measurement light
  • T TD, 700 is a transmittance at a wavelength of 700 nm obtained when the polarizer is arranged in a state where the absorption axis of the polarizer is parallel to the linearly polarized light of the measurement light, and these units are all in%.
  • T MD, 480 is the transmittance at a wavelength of 480 nm obtained when the polarizer is arranged in a state where the absorption axis of the polarizer is orthogonal to the linearly polarized light of the measurement light
  • T TD, 480 is the polarization
  • This is the transmittance at a wavelength of 480 nm obtained when the polarizer is placed in a state where the absorption axis of the polarizer is parallel to the linearly polarized light of the measuring light, and these units are%. That is, T MD and T TD are transmittances when linearly polarized light having a specific wavelength is incident on the polarizer in a specific direction.
  • A700 / A480 value of the polarizer is less than 0.7, the degree of polarization may decrease, and if the A700 / A480 value exceeds 1, the orthogonal hue b may approach blue and become defective.
  • A700 / A480 can be greater than or equal to 0.73 and can also be greater than or equal to 0.80.
  • A700 / A480 can be 0.95 or less and can also be 0.90 or less.
  • a polarizer satisfying Equation 1 can be achieved by various methods.
  • the characteristics of the film for forming a polarizer, the use of a crosslinking solution or a complementary color solution containing a metal salt at the time of manufacturing the polarizer the concentration of the boric acid compound in the crosslinking solution or the complementary color solution, the temperature, the concentration of the boric acid compound in the staining solution
  • it can be achieved through a method such as adjusting the draw ratio.
  • a metal salt is used as an example.
  • a cross-linking solution and a complementary color solution containing a metal salt are used in the production of a polarizer, the metal salt and the PVA-I 5 complex are chemically bonded.
  • the PVA- 15 complex can be prevented from being decomposed and the occurrence of reddening can be suppressed.
  • the metal salts may be used without particular limitation as long as it PVA-I 5 complex and chemically bonded can prevent degradation of PVA-I 5 complex.
  • Specific examples include zinc nitrate, copper nitrate, aluminum nitrate, magnesium nitrate, and zinc acetate. Among these, zinc nitrate is preferable in terms of durability improvement.
  • the metal salt may be contained in an amount of 0.05 to 1.5% by weight, preferably 0.1 to 1% by weight, based on the total weight of the polarizer. Within the above range, the color durability and optical characteristics of the polarizer can be maintained well.
  • this invention provides the manufacturing method of the polarizer by the above-mentioned this invention.
  • the method for producing a polarizer according to the present invention includes the steps of swelling, dyeing, crosslinking, complementing and stretching the polarizer-forming film, and at the end of the dyeing step, between the crystals in the polarizer-forming film in the stretching direction.
  • the dyeing solution contains a boric acid compound, and the crosslinking solution and the complementary color solution containing metal salts are used in the crosslinking and complementary color steps, respectively, so that the color even when exposed to high temperature conditions for a long time. A polarizer with minimal change can be produced.
  • iodine and iodine salt are added to the dyeing solution in the dyeing step.
  • the degree of polarization decreases.
  • the crosslinking step is performed by including a boric acid compound in the crosslinking liquid, the stability of the dichroic substance complex is reduced, and the hue of the polarizer is changed. There is a problem that durability is lowered.
  • the distance between crystals in the polarizer-forming film (polymer) in the stretching direction is 20 to 40 nm, and the dyeing solution contains a boric acid compound.
  • the retention time of the boric acid compound is improved before the crosslinking reaction is performed, and the degree of initial polarization is improved by increasing the complex formation rate of iodine which is a dichroic substance in the polarizer-forming film.
  • the metal salt and the dichroic substance complex are chemically bonded to each other by using a crosslinking solution and a complementary color solution containing a metal salt in the crosslinking and complementary color steps, respectively. Since the neutral substance complex is stabilized, the dichroic substance complex is not decomposed and the occurrence of reddening is suppressed.
  • each production step of the polarizer of the present invention, process conditions and the like are not particularly limited as long as they do not depart from the purpose of the present invention, and the stretching step may be performed as an independent step, among the swelling, dyeing and crosslinking steps. It may be performed simultaneously with one or more of the steps.
  • the type of the polarizer-forming film is not particularly limited as long as it is a film that can be dyed with a dichroic substance, that is, iodine, etc., for example, polyvinyl alcohol film, partially saponified polyvinyl alcohol film; polyethylene terephthalate film Hydrophilic polymer films such as ethylene-vinyl acetate copolymer films, ethylene-vinyl alcohol copolymer films, cellulose films, partially saponified films thereof; or dehydrated polyvinyl alcohol films Examples thereof include polyene oriented films such as polyvinyl alcohol film subjected to dehydrochlorination treatment. Among these, a polyvinyl alcohol film is preferable because it not only has an excellent effect of enhancing the uniformity of the degree of polarization in the plane, but also has an excellent dyeing affinity for iodine.
  • Swelling step In the swelling step, dust or anti-blocking agent deposited on the surface of the polarizer-forming film is immersed in a swelling tank filled with a swelling aqueous solution before dyeing the unstretched polarizer-forming film. This is a step for removing such impurities, swelling the polarizer-forming film to improve the drawing efficiency, and suppressing the unevenness of dyeing, and improving the physical properties of the polarizer.
  • aqueous solution for swelling usually water (pure water, deionized water) may be used alone, or a small amount of glycerin may be added to improve the processability of the polymer film.
  • the content is not particularly limited, and may be, for example, 5% by weight or less in the total weight of the aqueous solution for swelling.
  • the temperature of the swelling tank is not particularly limited, and may be, for example, 20 to 45 ° C., preferably 20 to 40 ° C.
  • the temperature of a swelling tank is in the said range, it is excellent in subsequent extending
  • the performance time of the swelling step is not particularly limited, and may be, for example, 180 seconds or less, and preferably 90 seconds or less.
  • swelling bath immersion time is within the above range, it is possible to suppress the swelling from becoming excessively saturated, prevent breakage due to softening of the polarizer forming film, and uniform adsorption of iodine in the dyeing step Thus, the degree of polarization can be improved.
  • Both the swelling step and the stretching step may be performed.
  • the stretching ratio may be about 1.1 to 3.5 times, preferably 1.5 to 3.0 times.
  • an expander roll, a spiral roll, a crown roll, a cross guider, a bend bar or the like may be provided in the bath and / or at the entrance / exit of the bath.
  • the dyeing step is a step of immersing the polarizer-forming film in a dyeing tank filled with a dichroic substance, for example, a dyeing solution containing iodine, and adsorbing iodine to the polarizer-forming film.
  • a dichroic substance for example, a dyeing solution containing iodine, and adsorbing iodine to the polarizer-forming film.
  • the distance between crystals in the polarizer-forming film (polymer) in the stretching direction is 20 to 40 nm, preferably 20 to 35 nm, more preferably 20 to 32 nm. Since the liquid contains a boric acid compound, the residence time of the boric acid compound can be improved before the crosslinking reaction is performed, thereby increasing the PVA-I 5 complex and PVA-I 3 complex formation rate in the polarizer-forming film. it can. Thereby, the color durability of the polarizer can be improved, and the degree of polarization is improved.
  • the stretching direction is preferably the MD direction.
  • the MD direction is the longitudinal direction (longitudinal direction) of the polarizer-forming film, and is also the transport direction of the polarizer-forming film in the production method of the present invention.
  • the distance between the crystals in the polarizer-forming film in the stretching direction can be achieved through adjustment of the type of polarizing protective film, the stretching ratio, etc., preferably accumulated at the end of the dyeing step
  • a method of adjusting the stretch ratio within the range of 2.0 to 3.0 times can be used.
  • the type of the boric acid compound is not particularly limited, and examples of the boric acid compound include boric acid, sodium borate, potassium borate, and lithium borate. These can be used alone or in admixture of two or more.
  • the concentration of the boric acid compound in the staining solution is not particularly limited. For example, it may be 0.3 to 5% by weight, preferably 0.5 to 3% by weight, based on the total weight of the staining solution. Good. When the concentration of the boric acid compound in the dyeing solution is less than 0.3% by weight, the effect of increasing iodine complex formation is reduced, and when it exceeds 5% by weight, cutting may occur due to an increase in stress.
  • the boric acid compound in the staining solution can be included so as to have a lower concentration than the boric acid compound added to the crosslinking solution in the subsequent crosslinking step.
  • the staining solution may further contain water, a water-soluble organic solvent, or a mixed solvent thereof and iodine.
  • the iodine concentration may be 0.4 to 400 mmol / L in the staining solution, preferably 0.8 to 275 mmol / L, more preferably 1 to 200 mmol / L.
  • the staining solution may further contain iodide as a solubilizing agent for improving the staining efficiency.
  • the type of iodide is not particularly limited.
  • potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, iodide Tin, titanium iodide and the like can be mentioned, and potassium iodide is preferable in terms of high solubility in water. These can be used alone or in admixture of two or more.
  • the content of the iodide is not particularly limited, and may be, for example, 0.01 to 10% by weight, preferably 0.1 to 5% by weight, based on the total weight of the staining solution.
  • the temperature of the dyeing tank is not particularly limited, and may be, for example, 5 to 42 ° C, preferably 10 to 35 ° C.
  • the time for immersing the polarizer forming film in the dyeing tank is not particularly limited, and may be, for example, 1 to 20 minutes, preferably 2 to 10 minutes.
  • the stretching step may be performed together with the dyeing step.
  • the stretching ratio may be 1.01 to 2.0 times, and preferably 1.1 to 1.8 times.
  • the cumulative stretch ratio of the polarizer until the end of the dyeing step including the swelling and stretching steps is preferably 2.0 to 3.0 times.
  • the distance between the crystals according to the present invention can be shown in the above range, and the problem that wrinkles of the film occur and the appearance defect occurs or the initial optical characteristics are degraded can be solved.
  • the cross-linking step is a step of fixing the adsorbed iodine molecules by immersing the polarizer-forming film dyed in the cross-linking solution so that the dyeability by physically adsorbed iodine molecules does not deteriorate due to the external environment. It is.
  • the cross-linking liquid used in the cross-linking step of the present invention includes a metal salt, the metal salt and the dichroic substance complex are chemically bonded to each other, thereby suppressing the mechanism of changing the hue of the polarizer and improving the durability. Can be improved.
  • iodine which is a dichroic dye, has an unstable crosslinking reaction
  • iodine molecules may be detached by a moist heat environment, so that a sufficient crosslinking reaction is required.
  • the cross-linking step according to the present invention may be performed in the first cross-linking step and the second cross-linking step, and a metal salt may be included in the cross-linking liquid used in one or more of the cross-linking steps.
  • the metal salt can be used without any particular limitation as described above, but specific examples include zinc nitrate, copper nitrate, aluminum nitrate, magnesium nitrate, zinc acetate, etc. Zinc nitrate is preferred.
  • the concentration of the metal salt in the cross-linking liquid is not particularly limited, and may be, for example, 0.5 to 4% by weight in the total weight of the cross-linking liquid.
  • concentration of the metal salt in the cross-linking liquid is less than 0.5% by weight, the effect of suppressing color change, particularly redness, does not appear, and when it exceeds 4% by weight, the degree of polarization decreases and the problem of poor hue occurs. Can do.
  • the cross-linking liquid of the present invention may further contain a boric acid compound.
  • a boric acid compound By including a boric acid compound, it is possible to improve crosslinking efficiency and suppress wrinkling of the film during the process, and to form an orientation of the dichroic substance to improve optical characteristics.
  • the concentration of the boric acid compound in the crosslinking liquid is not particularly limited, but may be, for example, 1 to 10% by weight, preferably 2 to 6% by weight, based on the total weight of the crosslinking liquid.
  • concentration of the boric acid compound in the crosslinking liquid is less than 1% by weight, the crosslinking effect may be reduced and the orientation of the film may be reduced.
  • concentration exceeds 10% by weight breakage occurs due to excessive crosslinking. Can do.
  • the same boric acid compound as that used in the dyeing step may be used.
  • the crosslinking liquid of the present invention may contain water used as a solvent and an organic solvent that can be mutually dissolved together with water, in order to prevent the uniformity of the degree of polarization in the polarizer plane and the desorption of dyed iodine.
  • a small amount of iodide may also be included.
  • the iodide used may be the same as that used in the dyeing step, and the concentration of the iodide is not particularly limited, and is, for example, 0.05 to 15% by weight in the total weight of the crosslinking solution. Preferably 0.5 to 11% by weight.
  • concentration of the iodide is not particularly limited, and is, for example, 0.05 to 15% by weight in the total weight of the crosslinking solution. Preferably 0.5 to 11% by weight.
  • the temperature of the crosslinking tank is not particularly limited, but may be, for example, 20 to 70 ° C, and preferably 40 to 60 ° C.
  • the time for immersing the polarizer-forming film in the crosslinking tank is not particularly limited, and may be, for example, 1 second to 15 minutes, and preferably 5 seconds to 10 minutes.
  • a stretching step may be performed together with the crosslinking step, in which case the stretching ratio of the first crosslinking step may be 1.4 to 3.0 times, preferably 1.5 to 2.5 times. Is good.
  • the stretching ratio of the second crosslinking step may be 1.01 to 2.0 times, preferably 1.2 to 1.8 times.
  • the cumulative draw ratio of the first crosslinking step and the second crosslinking step may be 1.5 to 5.0 times, and preferably 1.7 to 4.5 times.
  • the cumulative stretch ratio is less than 1.5 times, the effect of increasing the crosslinking efficiency may be negligible.
  • the cumulative stretch ratio exceeds 5.0 times, the film may be broken due to excessive stretching. Can be reduced.
  • the complementary color step is a step of adjusting the hue by immersing the film after the crosslinking step in a complementary color solution containing a metal salt, a boric acid compound and iodide.
  • the complementary color solution used in the complementary color step of the present invention contains a metal salt, whereby the metal salt and the dichroic substance complex are chemically bonded to increase the stability of the dichroic substance complex, thereby providing a polarizer.
  • the color change can be suppressed and the durability can be further improved.
  • the same metal salt as that used in the crosslinking step may be used.
  • the concentration of the metal salt in the complementary color solution is not particularly limited, and may be, for example, 0.5 to 4% by weight in the total weight of the complementary color solution.
  • concentration of the metal salt in the complementary color solution is less than 0.5% by weight, the color change, particularly reddening suppression effect does not appear, and when it exceeds 4% by weight, the degree of polarization decreases and the problem of poor hue occurs. Can do.
  • the complementary color liquid of the present invention may further contain a boric acid compound.
  • the boric acid compound may be the same as that used in the dyeing step.
  • the concentration of the boric acid compound in the complementary color solution is not particularly limited, but may be, for example, 1 to 10% by weight, preferably 2 to 6% by weight, based on the total weight of the complementary color solution.
  • concentration of the boric acid compound in the complementary color liquid is less than 1% by weight, the iodine orientation cannot be improved, and the color change suppression and durability improvement effects can be insignificant. Due to excessive cross-linking, a large tension is generated in the film at the time of stretching, making it difficult to stretch, and the film may be broken.
  • the concentration of the boric acid compound in the complementary color solution of the present invention is lower than the concentration of the boric acid compound in the crosslinking solution.
  • the concentration ratio is not particularly limited.
  • the concentration of the boric acid compound in the crosslinking liquid and the concentration of the boric acid compound in the complementary color liquid may have a ratio of 1: 0.4 to 0.8.
  • the concentration ratio is less than 1: 0.4, the iodine orientation cannot be improved, and the color change suppression and durability improvement effects may be slightly. If it is contained in an excessive amount and exceeds 1: 0.8, a large tension is generated in the film at the time of stretching, it is difficult to stretch, and the film may be broken.
  • the complementary color solution of the present invention may contain water used as a solvent and an organic solvent that is mutually soluble with water, in order to prevent the uniformity of the degree of polarization in the polarizer plane and the desorption of dyed iodine.
  • a small amount of iodide may also be included.
  • the iodide may be the same as that used in the dyeing step and the crosslinking step, and the concentration of the iodide is not particularly limited. For example, 0.05 to 15% by weight in the total weight of the complementary color solution Preferably, it is 0.5 to 11% by weight.
  • concentration of iodide in the complementary color solution satisfies the above range, unadsorbed iodine ions can be adsorbed to the film in the dyeing and crosslinking step, and the iodine ions contained in the complementary color solution can increase the penetration into the film. Hue and transmittance can be adjusted.
  • the iodide concentration in the complementary color solution of the present invention is lower than the iodide concentration in the crosslinking solution.
  • Iodide in the cross-linking solution prevents iodine ions adsorbed in the dyeing step from escaping from the film, but the complementary color solution also contains a high amount of iodide at a level similar to that of the cross-linking solution.
  • the iodine complex When exposed to the heat for a long time, the iodine complex may be decomposed to reduce the durability of the polarizer.
  • the concentration ratio is not particularly limited.
  • the concentration of iodide in the crosslinking solution and the concentration of iodide in the complementary color solution may have a ratio of 1: 0.2 to 0.6. If the iodide in the complementary color solution is contained in a small amount and the concentration ratio is less than 1: 0.2, the hue cannot be adjusted, and if it is contained in an excessive amount and exceeds 1: 0.6, the temperature is high. When exposed to heat for a long time, the iodine complex may be decomposed and durability may be lowered.
  • the temperature of the complementary color tank is 20 to 70 ° C., and the immersion time of the polyvinyl alcohol film in the complementary color tank may be 1 second to 15 minutes, preferably 5 seconds to 10 minutes.
  • the orientation of the dichroic substance complex can be improved by stretching the film for forming the polarizer, thereby improving the stability.
  • the polarizer produced by the method of the present invention can be heated to a high temperature. Even after long-term exposure, decomposition of the complex is minimized and color durability is excellent.
  • the stretching may be performed at a stretching ratio of 1.01 to 1.1 times.
  • the stretch ratio is less than 1.01, the effect of improving the degree of orientation of the dichroic substance complex is insignificant, and when it exceeds 1.1, the film can be broken by excessive stretching.
  • the stretching step is performed with at least one of a swelling step, a dyeing step, a crosslinking step, a complementary color step, as described above, or in air or an inert gas while transferring the film after the step.
  • it may be performed in an independent stretching step using a separate stretching tank filled with a stretching solution.
  • the film may be subjected to steps of swelling, dyeing, crosslinking, complementary color, washing with water and drying.
  • Stretching may be performed in one step or may be performed in two or more steps, but is preferably performed in two or more steps.
  • the stretching may be performed by a method such as providing a peripheral speed difference of the nip roll.
  • an expander roll, a spiral roll, a crown roll, a cross guider, a band bar and the like may be provided in the bath and / or at the entrance / exit of the bath.
  • the total cumulative stretch ratio of the present invention is preferably 4.0 to 7.0 times, and “cumulative stretch ratio” in this specification means a value obtained by multiplying the stretch ratio of each step.
  • the method for producing a polarizer of the present invention may further include a washing step after the complementary color is completed.
  • the washing step is a step of immersing the film for forming a polarizer for which complementary color has been completed in a washing tank filled with a washing solution and removing unnecessary residues attached to the film for forming a polarizer in the previous step.
  • the aqueous solution for washing may be water (deionized water), and iodide may be further added thereto.
  • iodide the same one used in the dyeing step may be used, and among these, it is preferable to use sodium iodide or potassium iodide.
  • the content of iodide is not particularly limited, and may be, for example, 0.1 to 10 parts by weight, preferably 3 to 8 parts by weight, based on the total weight of the aqueous washing solution.
  • the temperature of the washing tank is not particularly limited, and may be, for example, 10 to 60 ° C, preferably 15 to 40 ° C.
  • the water washing step can be omitted, and may be performed each time a previous step such as a dyeing step, a crosslinking step, a stretching step, or a complementary color step is completed. Moreover, it may be repeated one or more times, and the number of repetitions is not particularly limited.
  • the drying step is a step of drying the washed film for forming a polarizer and further improving the orientation of iodine molecules dyed by neck-in by drying to obtain a polarizer having excellent optical properties.
  • drying method natural drying, air drying, heat drying, microwave drying, hot air drying, and the like can be used. Recently, a microwave treatment for activating and drying only water in the film is new. In general, hot air treatment and far-infrared treatment are mainly used.
  • the temperature at the time of hot air drying is not particularly limited, it is preferably performed at a relatively low temperature in order to prevent deterioration of the polarizer, and may be, for example, 20 to 90 ° C, preferably 20 to 80 ° C, More preferably, it is 20 to 60 ° C.
  • the time for performing the hot air drying is not particularly limited, and may be performed, for example, for 1 to 10 minutes.
  • the polarizer manufactured with the manufacturing method of this invention shows the outstanding durability and polarization degree, and satisfy
  • T MD, 700 is a transmittance at a wavelength of 700 nm obtained when the polarizer is disposed in a state where the absorption axis of the polarizer is orthogonal to the linearly polarized light of the measurement light
  • T TD, 700 is a transmittance at a wavelength of 700 nm obtained when a polarizer having a pair of polarizers whose absorption axes are orthogonal to each other and arranged so that the absorption axis of the polarizer is parallel to the linearly polarized light of the measurement light.
  • T MD 480 is a transmittance at a wavelength of 480 nm obtained when the polarizer is disposed in a state where the absorption axis of the polarizer is orthogonal to the linearly polarized light of the measurement light
  • T TD, 480 is the transmittance at a wavelength of 480 nm obtained when the polarizer is placed in a state where the absorption axis of the polarizer is parallel to the linearly polarized light of the measurement light, and these units are all in%. is there.
  • the degree of polarization may decrease, and when the A700 / A480 value exceeds 1, the orthogonal hue b may approach blue and become defective.
  • the PVA-I 5 complex metal salt contained in the crosslinking liquid and the complementary color liquid as described above is linked to PVA-I 5 complex chemically, satisfy the range of Formula 1, The durability of the polarizer can be improved.
  • the present invention also provides a polarizing plate in which a protective layer is provided on at least one surface of the polarizer produced by the above method.
  • the protective layer provided on at least one surface of the polarizer functions to protect the polarizer, and may be, for example, a protective film in the form of a film or a resin coating layer in the form of a coating layer.
  • the type of the protective film is not particularly limited as long as it is a film excellent in transparency, mechanical strength, thermal stability, moisture shielding property, isotropy, etc.
  • Specific examples include polyethylene terephthalate, polyethylene isophthalate. Polyester resins such as phthalate and polybutylene terephthalate; Cellulosic resins such as diacetyl cellulose and triacetyl cellulose; Polycarbonate resins; Polyacrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Polystyrene, Acrylonitrile-styrene Styrenic resin such as copolymer; Polyolefin resin such as polyethylene, polypropylene, cyclo or norbornene structure, polyolefin resin such as ethylene propylene copolymer; Polyamide resin such as nylon and aromatic polyamide Imide resin, polyether sulfone resin, sulfone resin, polyether ketone resin, sulfurized poly
  • the film which consists of thermosetting resins, such as (meth) acrylic-type, urethane type, an epoxy type, a silicone type, or ultraviolet curable resin.
  • thermosetting resins such as (meth) acrylic-type, urethane type, an epoxy type, a silicone type, or ultraviolet curable resin.
  • a cellulose-based film having a surface saponified by alkali or the like is particularly preferable in consideration of polarization characteristics or durability.
  • the protective film may have a function of the following optical layer.
  • the resin coating layer may be a layer formed by coating and curing a curable resin composition on at least one surface of a polarizer.
  • the curable resin composition is preferably an active energy ray curable resin composition, which may contain an acrylate compound and a photo radical initiator.
  • An acrylate-based compound is a substance that can be polymerized by irradiation with active energy rays (for example, ultraviolet rays, visible light, electron beams, X-rays, etc.), and has one or more (meth) acryloyloxy groups in the molecular structure ( It is a (meth) acrylic compound.
  • active energy rays for example, ultraviolet rays, visible light, electron beams, X-rays, etc.
  • the (meth) acrylic compound having one or more (meth) acryloyloxy groups in the molecule is a (meth) acrylate monomer having one or more (meth) acryloyloxy groups in the molecule, two or more in the molecule And (meth) acryloyloxy group-containing compounds such as (meth) acrylate oligomers having a (meth) acryloyloxy group.
  • (meth) acryloyloxy group means acryloyloxy group and methacryloyloxy group
  • (meth) acrylic compound means acrylate ester derivative and methacrylic acid ester derivative, respectively
  • (meth) acrylate oligomer means acrylate oligomer or methacrylate oligomer, respectively.
  • the (meth) acrylate monomer is a monofunctional (meth) acrylate monomer having one (meth) acryloyloxy group in the molecule, a bifunctional (meth) acrylate monomer having two (meth) acryloyloxy groups in the molecule, and Examples thereof include polyfunctional (meth) acrylate monomers having at least three (meth) acryloyloxy groups in the molecule. These (meth) acrylate monomers can be used alone or in combination of two or more.
  • monofunctional (meth) acrylate monomers include tetrahydrofurfuryl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 3-hydroxypropyl (meth) acrylate.
  • bifunctional (meth) acrylate monomers include alkylene glycol di (meth) acrylates, polyoxyalkylene glycol di (meth) acrylates, halogen substituted alkylene glycol di (meth) acrylates, aliphatic polyol di (meta) ) Diacrylates of di (meth) acrylates of acrylates, hydrogenated dicyclopentadiene or tricyclodecane dialkanol, di (meth) acrylates of dioxane glycol or dioxane dialkanol, di (meth) acrylate adducts of bisphenol A or bisphenol F Meth) acrylates, bisphenol A or bisphenol F epoxy di (meth) acrylates, and the like can be used.
  • bifunctional (meth) acrylate monomer examples include ethylene glycol di (meth) acrylate, 1,3-butanediol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1, 6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, trimethylolpropane di (meth) acrylate, pentaerythritol di (meth) acrylate, ditrimethylol Propane di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, polyethylene Glycol di (meth) acrylate, polypropylene glycol di (meth)
  • polyfunctional (meth) acrylate monomers include glycerin tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, ditrimethylolpropane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, pentaerythritol tri ( Poly (3) or higher aliphatic polyols such as (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, etc.
  • Typical examples are (meth) acrylates, tri (tri- or higher-valent) halogen-substituted polyol poly (meth) acrylates, triglyceride alkylene oxide adducts.
  • Examples include isocyanurate tri (meth) acrylate and silicone hexa (meth) acrylate.
  • Photo radical initiator is used for curing acrylate compounds.
  • the photo radical initiator that can be used is not particularly limited in the present invention, and any photo radical initiator can be used as long as it can initiate photocuring by irradiation with a known active energy ray.
  • the active energy rays include visible light, ultraviolet rays, X-rays, electron beams and the like.
  • photo radical initiators include acetophenone, 3-methylacetophenone, benzyldimethyl ketal, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 2-methyl-1-4 (Methylthio) phenyl] -2-morpholinopropan-1-one, acetophenone-based initiators including 2-hydroxy-2-methyl-1-phenylpropan-1-one; benzophenone, 4-chlorobenzophenone, 4,4′- Benzophenone initiators including diaminobenzophenone; benzoin ether initiators including benzoinpropyl ether and benzoin ethyl ether; thioxanthone initiators including 4-isopropylthioxanthone; other xanthones, fluorenone, camphor-quinone, benzaldehyde, Ntorakinon like although not limited thereto.
  • the active energy ray-curable resin composition containing the acrylate compound and the photo radical initiator mentioned above may further contain another composition.
  • the active energy curable resin composition of the present invention may further contain an epoxy compound, a cationic polymerization initiator, and an oxetane compound.
  • the epoxy compound is used to increase the adhesive strength and adhesion of the cured film, and preferably a hydrogenated epoxy compound, an alicyclic epoxy compound, an aliphatic epoxy compound, or a mixture thereof may be used. Good.
  • the hydrogenated epoxy compound means a resin obtained by selectively hydrogenating an aromatic epoxy resin under pressure in the presence of a catalyst.
  • the aromatic epoxy resin include bisphenol type epoxy resins such as diglycidyl ether of bisphenol A, diglycidyl ether of bisphenol F, diglycidyl ether of bisphenol S, phenol novolac epoxy resin, cresol novolac epoxy resin, hydroxy
  • novolak-type epoxy resins such as benzaldehyde phenol novolac epoxy resins; glycidyl ethers of tetrahydroxyphenylmethane, glycidyl ethers of tetrahydroxybenzophenone, and polyfunctional epoxy resins such as epoxidized polyvinylphenol.
  • the nucleus hydrogenated product of these aromatic epoxy resins becomes a hydrogenated epoxy resin, it is preferable to use hydrogenated glycidyl ether of bisphenol A.
  • An alicyclic epoxy compound means an alicyclic ring compound containing at least one epoxy group in the molecule.
  • Specific examples of the alicyclic epoxy compound include 7-oxabicyclo [4.1.0] heptane-3-carboxylic acid and (7-oxabicyclo [4.1.0] hept-3-yl).
  • the alicyclic epoxy compound may be an alicyclic diepoxycarboxylate.
  • Examples of the alicyclic diepoxycarboxylate include 3,4-epoxycyclohexylmethyl-3 ′, 4′-epoxycyclohexanecarboxylate.
  • Examples of the aliphatic epoxy compound include polyglycidyl ethers of aliphatic polyhydric alcohols or alkylene oxide adducts thereof. Specific examples include 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, glycerin triglycidyl ether, trimethylolpropane triglycidyl ether, polyethylene glycol diglycidyl ether, Propylene glycol diglycidyl ether, polyether obtained by adding one or more alkylene oxides (ethylene oxide, propylene oxide, etc.) to aliphatic polyhydric alcohols such as ethylene glycol, propylene glycol and glycerin Examples thereof include polyglycidyl ether of polyol.
  • the hydrogenated epoxy compound, alicyclic epoxy compound, and aliphatic epoxy compound may be used alone or in combination of two or more.
  • the cationic polymerization initiator is used for curing the epoxy compound, and starts a polymerization reaction of the epoxy compound with a compound that generates a cation or a Lewis acid by irradiation with active energy rays or heating.
  • Cationic polymerization initiators that can be used are not particularly limited in the present invention, and typically include onium salts such as aromatic diazonium salts, aromatic iodine aluminum salts, aromatic sulfonium salts, iron-allene complexes, and the like. It is not limited to these.
  • aromatic diazonium salts examples include benzenediazonium hexafluoroantimonate, benzenediazonium hexafluorophosphate, benzenediazonium hexafluoroborate, and the like.
  • aromatic iodine aluminum salts include diphenyliodonium tetrakis (pentafluorophenyl) borate, diphenyliodonium hexafluorophosphate, diphenyliodonium hexafluoroantimonate, and di (4-nonylphenyl) iodonium hexafluorophosphate. .
  • aromatic sulfonium salts include triphenylsulfonium hexafluorophosphate, triphenylsulfonium hexafluoroantimonate, triphenylsulfonium tetrakis (pentafluorophenyl) borate, 4,4′-bis [diphenylsulfonio] diphenyl sulfide bishexa Fluorophosphate, 4,4′-bis [di ( ⁇ -hydroxyethoxy) phenylsulfonio] diphenyl sulfide bishexafluoroantimonate, 4,4′-bis [di ( ⁇ -hydroxyethoxy) phenylsulfonio] diphenyl sulfide bis Hexafluorophosphate, 7- [di (p-toluyl) sulfonio] -2-isopropylthioxanthone hexafluoroantimonate
  • iron-allene complexes examples include xylene-cyclopentadienyl iron (II) hexafluoroantimonate, cumene-cyclopentadienyl iron (1I) hexafluorophosphate, xylene-cyclopentadienyl iron (II). -Tris (trifluoromethylsulfonyl) methanide and the like.
  • cationic polymerization initiators can be used alone or in combination of two or more of the compositions mentioned above.
  • curability is excellent, and the mechanical properties and adhesive strength of the cured film can be further improved.
  • the cationic polymerization initiator may be directly manufactured and used, or a commercially available one may be purchased and used.
  • commercially available products include Kayrad PCI-220, Kayalad PCI-620 manufactured by Nippon Kayaku Co., Ltd., UVI-6990 manufactured by Union Carbide Co., Ltd., Adekaoptomer SP-150 manufactured by ADEKA Co., Ltd., Ameka Optoma SP-170, Japan CI-5102, CIT-1370, CIT-1682, CIP-1866S, CIP-2048S, and CIP-2064S manufactured by Soda Co., Ltd., DPI-101, DPI-102, DPI-103, DPI- manufactured by Midori Chemical Co., Ltd.
  • the content of the cationic polymerization initiator can be limited so that the epoxy compound is sufficiently cured and does not affect the physical properties of the coating film. Preferably, it can be used in an amount of 0.01 to 10 parts by weight, more preferably 1 to 6 parts by weight, based on 100 parts by weight of the acrylate compound.
  • the content of the cationic polymerization initiator is less than the above range, there is a problem that the curing of the epoxy compound becomes insufficient and the mechanical strength or adhesive strength of the cured film is reduced. Since the ionic substance increases, the moisture absorption of the cured film increases, and the optical durability may be lowered. Therefore, the ionic substance can be appropriately adjusted within the above range.
  • Oxetane compounds not only lower the viscosity of the active energy ray-curable resin composition and facilitate the film production process, but also increase the curing rate, and suppress the yellowing of the final cured film. As a result, the optical performance is improved.
  • the oxetane compound is preferably used when an epoxy compound is applied to the active energy ray-curable resin composition, and a compound having at least one oxetane ring (four-membered ether) in the molecular structure may be used. .
  • the oxetane compound that can be used is not particularly limited in the present invention.
  • oxetane compounds may be produced directly or purchased from commercially available materials.
  • the content of the oxetane compound can be controlled in order to maximize the effect on the adhesion, viscosity and optical performance, for example, 10 to 50 parts by weight, preferably 100 to 100 parts by weight, preferably 100 parts by weight of the epoxy compound. It can be used at 20 to 40 parts by weight.
  • the content of the oxetane compound is less than the above range, the viscosity due to the addition of the oxetane compound is reduced, or the effect of improving the optical performance is not sufficient, and when exceeding the above range, the adhesiveness to the polarizer is reduced. Problems may occur, and it is preferable to use them appropriately within the above range.
  • the curable resin composition according to the present invention is an antioxidant for adjusting adhesive force, cohesive force, viscosity, elastic modulus, glass transition temperature and the like required for the curable resin composition.
  • various additives such as a leveling agent, a surface lubricant, a dye, a pigment, an antifoaming agent, a filler, and a light stabilizer may be further included.
  • the manufacturing method of a curable resin composition is not specifically limited by this invention, It can manufacture by a well-known method.
  • the structure of the polarizing plate according to the present invention is not particularly limited, and various optical layers capable of satisfying necessary optical characteristics may be laminated on the polarizer or the polarizing plate.
  • a structure in which a protective layer for protecting the polarizer is laminated on at least one surface of the polarizer; a hard coating layer, an antireflection layer, an anti-adhesion layer, a diffusion prevention layer, an antiglare layer on at least one surface of the polarizer or the protection layer A structure in which a surface treatment layer such as a layer is laminated; or a structure in which an alignment liquid crystal layer or other functional film for compensating a viewing angle is laminated on at least one surface of a polarizer or a protective layer.
  • wave plates such as optical films such as polarization conversion devices, reflectors, semi-transmissive plates, half-wave plates, and quarter-wave plates used to form various image display devices.
  • wave plates including ⁇ plates
  • optical films such as polarization conversion devices, reflectors, semi-transmissive plates, half-wave plates, and quarter-wave plates used to form various image display devices.
  • a structure in which one or more of the included retardation plate, viewing angle compensation film, and brightness enhancement film are laminated as an optical layer may be used.
  • a polarizing plate having a structure in which a protective layer is laminated on one surface of a polarizer, and a reflective polarizing plate or a semi-transmissive polarizing plate in which a reflector or a semi-transmissive reflector is laminated on the laminated protective layer;
  • Such a polarizing plate is applicable not only to a normal liquid crystal display device but also to various image display devices such as an electroluminescence display device, a plasma display device, and a field emission display device.
  • Example 1 A transparent unstretched polyvinyl alcohol (PVA) film (PE60, KURARAY, Inc.) having a saponification degree of 99.9% or more was immersed in 25 ° C. water (deionized water) for 1 minute and 20 seconds to swell, then 1 mM iodine / L, 1% by weight of potassium iodide and 0.3% by weight of boric acid were immersed in an aqueous dyeing solution at 30 ° C. for 2 minutes and 30 seconds for dyeing. At this time, the film was stretched at stretch ratios of 1.56 times and 1.64 times in the swelling and dyeing steps, respectively, and stretched so that the cumulative stretch ratio after passing through the dyeing tank was 2.56 times.
  • PVA polyvinyl alcohol
  • the film was stretched 1.01 times while immersed in an aqueous solution for complementary color at 40 ° C. containing 5% by weight of potassium iodide, 2% by weight of boric acid, and 0.5% by weight of zinc nitrate of Oi Kakin Co., Ltd. for 10 seconds. .
  • the total cumulative draw ratio in the MD direction of the swelling, dyeing, crosslinking and complementary color steps was set to 6 times.
  • the polyvinyl alcohol film was dried in an oven at 70 ° C. for 4 minutes to produce a polarizer.
  • a polarizing plate was manufactured by laminating a triacetyl cellulose (TAC) film on both sides of the manufactured polarizer.
  • TAC triacetyl cellulose
  • Example 2 (2) Examples 2 to 8 and Comparative Examples 1 to 3 Same as Example 1 except for the composition (type and concentration), temperature, total cumulative draw ratio, and metal salt content with respect to the total weight of the polarizer of the crosslink solution or complementary color solution described in Table 1 and Table 2 below.
  • a polarizing plate was produced by this method.
  • the distance between the crystals in the polarizer forming film in the stretching direction was 27 nm.
  • Test Example The physical properties of the polarizers produced in the above Examples and Comparative Examples were measured by the following methods, and the results are shown in Tables 3 and 4 below.
  • Optical properties degree of polarization, transmittance, A700, A480
  • the manufactured polarizer was cut into a size of 4 cm ⁇ 4 cm, and the transmittance was measured using an ultraviolet-visible light spectrometer (V-7100, manufactured by JASCO).
  • V-7100 ultraviolet-visible light spectrometer
  • the degree of polarization is defined by Equation 4 below. It should be noted that a difference of about 0.001 in the degree of polarization greatly affects the contrast ratio. When the degree of polarization is less than 99.990, the contrast ratio decreases, and real black becomes difficult to implement.
  • Polarization degree (P) [(T 1 ⁇ T 2 ) / (T 1 + T 2 )] 1/2 ⁇ 100 (4)
  • T 1 is a parallel transmittance obtained when a pair of polarizers are arranged in a state where the absorption axes are parallel
  • T 2 is when a pair of polarizers are arranged in a state where the absorption axes are orthogonal to each other. Is the orthogonal transmittance obtained.
  • the unit of polarization degree (P) is%.
  • A700 and A480 are absorbances defined by the above formulas 2 and 3.

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Abstract

La présente invention concerne un polariseur qui satisfait les formules suivantes : 0,7 ≤ A700/A480 ≤ 1,0 ; A700 = −Log10{(TMD,700×TTD,700)/10,000} ; et A480 = −Log10{(TMD,480×TTD,480)/10,000}. TMD,700 et TTD,700 représentent respectivement une transmittance de longueur d'onde de 700 nm obtenue lorsque le polariseur est disposé dans un état tel que l'axe d'absorption du polariseur est perpendiculaire à la lumière polarisée linéairement de la lumière mesurée, et disposé dans un état tel que l'axe d'absorption est parallèle. TMD,480 et TTD,480 représentent respectivement une transmittance de longueur d'onde de 480 nm obtenue lorsque le polariseur est disposé dans un état tel que l'axe d'absorption du polariseur est perpendiculaire à la lumière polarisée linéairement de la lumière mesurée, et disposé dans un état tel que l'axe d'absorption est parallèle. Lesdites unités sont toutes en termes de %.
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KR20220063120A (ko) 2019-09-20 2022-05-17 닛토덴코 가부시키가이샤 편광막의 제조 방법, 및 편광 필름의 제조 방법
WO2023037939A1 (fr) * 2021-09-07 2023-03-16 住友化学株式会社 Procédé de production de film polarisant et procédé de production de plaque de polarisation
WO2023112533A1 (fr) * 2021-12-17 2023-06-22 三菱瓦斯化学株式会社 Feuille polarisante
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JP7495416B2 (ja) 2019-01-23 2024-06-04 住友化学株式会社 偏光子及びその製造方法
JP7504744B2 (ja) 2020-10-01 2024-06-24 住友化学株式会社 偏光板及び有機ｅｌ表示装置

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JP2022150490A (ja) * 2021-03-26 2022-10-07 住友化学株式会社 偏光フィルム及び偏光板の製造方法

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JP7495416B2 (ja) 2019-01-23 2024-06-04 住友化学株式会社 偏光子及びその製造方法
KR20220063121A (ko) 2019-09-20 2022-05-17 닛토덴코 가부시키가이샤 편광막의 제조 방법, 및 편광 필름의 제조 방법
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JP7504744B2 (ja) 2020-10-01 2024-06-24 住友化学株式会社 偏光板及び有機ｅｌ表示装置
WO2023037939A1 (fr) * 2021-09-07 2023-03-16 住友化学株式会社 Procédé de production de film polarisant et procédé de production de plaque de polarisation
WO2023112533A1 (fr) * 2021-12-17 2023-06-22 三菱瓦斯化学株式会社 Feuille polarisante
KR20240033662A (ko) 2022-09-05 2024-03-12 스미또모 가가꾸 가부시키가이샤 편광판

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