WO2017078092A1 - Polariseur et son procédé de production - Google Patents

Polariseur et son procédé de production Download PDF

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Publication number
WO2017078092A1
WO2017078092A1 PCT/JP2016/082655 JP2016082655W WO2017078092A1 WO 2017078092 A1 WO2017078092 A1 WO 2017078092A1 JP 2016082655 W JP2016082655 W JP 2016082655W WO 2017078092 A1 WO2017078092 A1 WO 2017078092A1
Authority
WO
WIPO (PCT)
Prior art keywords
polarizer
film
drying
stretching
forming film
Prior art date
Application number
PCT/JP2016/082655
Other languages
English (en)
Japanese (ja)
Inventor
重萬 朴
容鉉 權
天煕 趙
正寧 崔
公彦 矢可部
Original Assignee
住友化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to KR1020187010613A priority Critical patent/KR20180066100A/ko
Priority to CN201680062513.2A priority patent/CN108351453B/zh
Priority to JP2017548824A priority patent/JP6942055B2/ja
Publication of WO2017078092A1 publication Critical patent/WO2017078092A1/fr

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00634—Production of filters
    • B29D11/00644—Production of filters polarizing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
    • B29D11/00788—Producing optical films
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details

Definitions

  • the present invention relates to a polarizer and a method for manufacturing the same, and more particularly to a polarizer having a small shrinkage force in the absorption axis (stretching) direction and less uneven stripes extending along the stretching direction with unevenness and a method for manufacturing the same. .
  • Polarizers used in various image display devices such as liquid crystal display devices (LCD), electroluminescence (EL) display devices, plasma display devices (PDP), field emission display devices (FED), OLEDs, etc.
  • a polyvinyl alcohol (PVA) film includes a polarizer in which an iodine compound or a dichroic polarizing material is adsorbed and oriented, and a polarizer protective film is sequentially laminated on one surface of the polarizer.
  • the other surface of the child has a multilayer structure in which a polarizer protective film, an adhesive layer bonded to another member, and a release film are sequentially laminated.
  • a polarizer constituting a polarizing plate is applied to an image display device, and is basically required to have both high transmittance and degree of polarization in order to provide an image having excellent color reproducibility.
  • a polarizer was manufactured by modifying the polyvinyl alcohol film itself or using a non-sublimation dichroic dye in place of the sublimable iodine polarization element.
  • a polarizer usually requires a stretching process in order to impart a polarizing function.
  • the polarizer is deformed during use due to an inherent contraction force in the stretching (absorption axis) direction.
  • the deformation of the polarizer causes a decrease in the optical function of the polarizer and a failure of the image display device.
  • Japanese Published Patent Application No. 2010-145866 discloses a method of manufacturing a polarizer with a small shrinkage stress, but it does not present a satisfactory alternative to the above problem.
  • a polarizer having an arithmetic average height (Sa) of 21.0 nm or less.
  • the drying step includes a step of bringing the polarizer-forming film into contact with a hot roll and drying the film,
  • the method for producing a polarizer wherein the time for bringing the polarizer-forming film into contact with a hot roll is 50% or more of the total drying time.
  • a polarizing plate comprising the polarizer according to any one of 1 to 3 and a polarizer protective film bonded to at least one surface of the polarizer.
  • An image display device comprising the polarizing plate as described in 9 above.
  • the drying neck-in value is adjusted to a specific range by drying the polarizer-forming film in contact with a hot roll for a specific time, and in the absorption axis direction. It is possible to manufacture a polarizer that exhibits a low contraction force and has markedly reduced streak-like unevenness extending along the stretching direction with unevenness.
  • a polarizer produced by stretching a polarizer-forming film starts to shrink during drying during the manufacturing process, but excessive drying neck-in occurs during such shrinking process, resulting in unevenness. There is a problem that streaky unevenness extending along the stretching direction occurs.
  • the contraction force in the absorption axis direction that could not be sufficiently resolved occurs when the polarizer applied to the image display device or the like subsequently receives heat from the outside, resulting in deformation of the polarizer. .
  • the arithmetic average height (Sa) of the polarizer of the present invention is adjusted to 21.0 nm or less, so that the stripe-like unevenness extending along the stretching direction with the contraction force and the unevenness in the absorption axis direction is noticeable. Can be reduced.
  • the inventor of the present invention when the film for forming a polarizer is in contact with a hot roll and is dried, the film for forming a polarizer is supported by the hot roll, and in the width direction of the polarizer (direction perpendicular to the stretching direction).
  • the shrinkage By controlling the shrinkage, the unevenness generated by the deformation in the width direction of the polarizer is suppressed, so that streaky unevenness extending along the stretching direction with the unevenness is suppressed.
  • the contraction in the width direction of the polarizer the thickness of the polarizer-forming film is further reduced by that amount, and the contraction force in the stretching (absorption axis) direction of the polarizer is reduced.
  • the inventor of the present invention also adjusts the arithmetic average height (Sa) of the polarizer to 21.0 nm or less to reduce the shrinkage force in the absorption axis direction and to extend along the stretching direction with unevenness. The unevenness of the shape was remarkably reduced.
  • the arithmetic average height of the polarizer is 21.0 nm or less, the intended effect of the present invention is achieved, so the lower limit thereof is not particularly limited. For example, 1.0 nm or more, 0.1 nm or more, or 0 nm It may be super.
  • the arithmetic average height of the polarizer may be 21.0 nm or less, but is preferably 19.0 nm or less, and more preferably 17.0 nm or less.
  • the arithmetic average height (Sa) can be measured based on, for example, ISO 25178.
  • the arithmetic average height (Sa) of the polarizer in order to adjust the arithmetic average height (Sa) of the polarizer to 21.0 nm or less, it can be adjusted by controlling the ratio of the hot roll drying time in the total drying time to 50% or more. it can.
  • the polarizer of the present invention in which the arithmetic average height is adjusted may have a thickness relatively lower than that of a normal polarizer, and the lower limit of the thickness of the polarizer is 5 ⁇ m from these side faces. It may be 7 ⁇ m.
  • the upper limit of the thickness of the polarizer may be 30 ⁇ m, 28 ⁇ m, or 23 ⁇ m.
  • it in order to adjust the thickness of a polarizer to the above-mentioned range, it can adjust by controlling the ratio of the hot roll drying time in the total drying time to 50% or more.
  • the polarizer of the present invention has a low contraction force in the absorption axis direction.
  • the contraction force in the absorption axis direction may be 3 N / 2 mm or less.
  • the contraction force in the absorption axis direction is 3 N / 2 mm or less, deformation of the polarizer can be effectively prevented.
  • the lower the shrinkage force in the absorption axis direction the better. Therefore, the lower limit thereof is not particularly limited, and may be, for example, 2 N / 2 mm or more, 1 N / 2 mm or more, or 0.1 N / 2 mm or more.
  • it in order to adjust the contraction force of the polarizer to the above-described range, it can be adjusted by controlling the ratio of the hot roll drying time in the total drying time to 50% or more.
  • the present invention also provides a method for producing the aforementioned polarizer.
  • the method for producing a polarizer of the present invention includes a step of swelling, dyeing, stretching, cross-linking and drying of a film for forming a polarizer, and the drying step comprises a step of drying the film for forming a polarizer by contacting with a hot roll. And the time for which the polarizer-forming film is brought into contact with the hot roll is 50% or more of the total drying time.
  • a film that can be dyed with a dichroic substance for example, iodine
  • a dichroic substance for example, iodine
  • polyvinyl alcohol film partially saponified polyvinyl alcohol film; polyethylene terephthalate film, ethylene-vinyl acetate copolymer film, ethylene-vinyl alcohol copolymer film, cellulose film, partially A hydrophilic polymer film such as a saponified film, or a polyene oriented film such as a dehydrated polyvinyl alcohol film or a dehydrochlorinated polyvinyl chloride film can be used.
  • 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.
  • the method for producing a polarizer according to the present invention may include a swelling step, a dyeing step, a crosslinking step, a complementary color step, a stretching step, a water washing step, and a drying step, and can be classified according to a stretching method.
  • a dry stretching method, a wet stretching method, or a hybrid stretching method in which the above-mentioned two kinds of stretching methods are mixed can be used.
  • the manufacturing method of the polarizer of this invention is demonstrated taking the wet extending
  • the remaining steps except the drying step are the states in which the film for forming the polarizer is immersed in a constant temperature bath (bath) filled with one or more solutions each selected from various types of solutions. Can be done.
  • the stretching step may be performed at least once or may be performed a plurality of times. When it is performed a plurality of times, it may be performed separately at an arbitrary step in the manufacturing process of the polarizer.
  • the total drying time is the time for performing the drying step, and refers to the time during which any drying method is performed on the polarizer-forming film. For example, if drying is performed by contacting with a heat roll, the time for contacting the film with the heat roll, the time for transporting the film between the heat rolls when using a plurality of heat rolls, hot air drying If hot air is applied to the film, if air drying is applied, air is applied to the film, if heated, the film is heated, if far infrared is applied, the film is irradiated with far infrared light. In the case of microwave drying, the time during which the film is irradiated with microwaves is included in the total drying time. Accordingly, the total drying time includes a time during which a drying method other than the method of drying the polarizer-forming film in contact with a hot roll is performed.
  • the polarizer according to the present invention can be provided as a polarizing plate with a polarizer protective film bonded to at least one surface.
  • the material of the polarizer protective film is not particularly limited.
  • various transparent resin films including at least one selected from the group consisting of an acrylic resin film, a cellulose resin film, a polyolefin resin film, and a polyester resin film are used. Can be used.
  • the protective film include acrylic resin films such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; polyester resin films such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, and polybutylene terephthalate; Cellulose-based resin films such as diacetylcellulose, triacetylcellulose, and cellulose acetate propionate; polyolefin-based resin films such as polyethylene, polypropylene, polyolefins having a cyclo- or norbornene structure, and ethylene-propylene copolymers; However, it is not limited to these.
  • the polarizing plate according to the present invention is applicable not only to a normal liquid crystal display device but also to various image display devices such as an organic electroluminescence display device (OLED), a plasma display device, and a field emission display device.
  • OLED organic electroluminescence display device
  • plasma display device a plasma display device
  • field emission display device a field emission display device
  • the film was stretched at a stretching ratio of 1.482 times and 1.607 times in the swelling and dyeing steps, respectively.
  • it was immersed in an aqueous solution for crosslinking at 53 ° C. containing 11.0% by weight of potassium iodide and 4% by weight of boric acid with respect to 100% by weight of water for 39 seconds (crosslinking step).
  • the film was stretched at a double stretch ratio.
  • the film was stretched 1.05 times while immersed in a complementary color aqueous solution at 40 ° C. containing 11% by weight of potassium iodide and 4% by weight of boric acid with respect to 100% by weight of water (complementary color step).
  • the crosslinked polyvinyl alcohol film was washed with deionized water (water washing step) and then dried using a hot roll and hot air (drying step) to produce a polarizer having a transmittance of 42.5%.
  • Specific conditions of the hot roll and hot air are as described in Table 1 below.
  • Dry NECK-IN measurement> The dry NECK-IN, which means the rate of decrease of the polarizer before and after drying, was measured according to the above Equation 1.
  • the fluorescent lamp reflection method is an evaluation method in which light from a fluorescent lamp is incident from an oblique direction of about 45 °, and unevenness of a polarizing plate is visually confirmed with reflected light.
  • Lv1. Level in which unevenness cannot be confirmed in the obtained polarizing plate
  • Lv2. In the obtained polarizing plate, unevenness can be visually recognized by the fluorescent lamp reflection method but cannot be visually confirmed Lv3. : In the obtained polarizing plate, unevenness can be visually recognized by the fluorescent lamp reflection method, and visually visible level.
  • Polarization degree (P) [(T 1 ⁇ T 2 ) / (T 1 + T 2 )] 1/2 (In the formula, T 1 is a parallel transmittance obtained when a pair of polarizers are arranged in a state where the absorption axes are parallel, and T 2 is a case where a pair of polarizers is arranged in a state where the absorption axes are orthogonal to each other. It is the orthogonal transmittance obtained).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

L'invention concerne un polariseur qui présente une hauteur moyenne arithmétique (Sa) inférieure ou égale à 21,0 nm.
PCT/JP2016/082655 2015-11-05 2016-11-02 Polariseur et son procédé de production WO2017078092A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1020187010613A KR20180066100A (ko) 2015-11-05 2016-11-02 편광자 및 그 제조방법
CN201680062513.2A CN108351453B (zh) 2015-11-05 2016-11-02 偏振片及其制造方法
JP2017548824A JP6942055B2 (ja) 2015-11-05 2016-11-02 偏光子及びその製造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2015-0155196 2015-11-05
KR1020150155196A KR20170052991A (ko) 2015-11-05 2015-11-05 편광자 및 그의 제조방법

Publications (1)

Publication Number Publication Date
WO2017078092A1 true WO2017078092A1 (fr) 2017-05-11

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ID=58662181

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/082655 WO2017078092A1 (fr) 2015-11-05 2016-11-02 Polariseur et son procédé de production

Country Status (5)

Country Link
JP (1) JP6942055B2 (fr)
KR (2) KR20170052991A (fr)
CN (1) CN108351453B (fr)
TW (1) TWI762455B (fr)
WO (1) WO2017078092A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111095054A (zh) * 2017-09-13 2020-05-01 日东电工株式会社 偏振片、偏振片卷、及偏振膜的制造方法
CN111095053A (zh) * 2017-09-13 2020-05-01 日东电工株式会社 偏振片、偏振片卷、及偏振膜的制造方法
CN111095052A (zh) * 2017-09-13 2020-05-01 日东电工株式会社 偏振片、偏振片卷、及偏振膜的制造方法
CN111095056A (zh) * 2017-09-13 2020-05-01 日东电工株式会社 偏振片、偏振片卷、及偏振膜的制造方法
CN111316141A (zh) * 2017-09-13 2020-06-19 日东电工株式会社 偏振片、偏振片卷、及偏振膜的制造方法
JP2021033086A (ja) * 2019-08-26 2021-03-01 日東電工株式会社 偏光フィルムの乾燥装置及び乾燥方法
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005173495A (ja) * 2003-12-15 2005-06-30 Sumitomo Chemical Co Ltd ヨウ素系偏光フィルムの製造方法、偏光板の製造方法および光学積層体の製造方法
JP2006305924A (ja) * 2005-04-28 2006-11-09 Nippon Synthetic Chem Ind Co Ltd:The ポリビニルアルコール系フィルムの製造方法、およびポリビニルアルコール系フィルム
JP2014119501A (ja) * 2012-12-13 2014-06-30 Nitto Denko Corp 偏光フィルムの製造方法

Family Cites Families (5)

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TWI245147B (en) * 2000-06-19 2005-12-11 Nitto Denko Corp Polarizing plate and liquid crystal display using the same
WO2006070936A1 (fr) * 2004-12-28 2006-07-06 Fujifilm Corporation Dispositif d'affichage a cristaux liquides, feuille de compensation optique, et polariseur et dispositif d'affichage a cristaux liquides utilisant lesdits elements
JP5335401B2 (ja) 2008-12-19 2013-11-06 富士フイルム株式会社 偏光フィルム及び偏光フィルムの製造方法、偏光板及び偏光板の製造方法、並びに乗り物用映り込み防止フィルム
JP2012014001A (ja) * 2010-07-01 2012-01-19 Nitto Denko Corp 偏光子の製造方法、偏光子、偏光板、光学フィルムおよび画像表示装置
JP5616318B2 (ja) * 2011-12-12 2014-10-29 日東電工株式会社 偏光膜の製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005173495A (ja) * 2003-12-15 2005-06-30 Sumitomo Chemical Co Ltd ヨウ素系偏光フィルムの製造方法、偏光板の製造方法および光学積層体の製造方法
JP2006305924A (ja) * 2005-04-28 2006-11-09 Nippon Synthetic Chem Ind Co Ltd:The ポリビニルアルコール系フィルムの製造方法、およびポリビニルアルコール系フィルム
JP2014119501A (ja) * 2012-12-13 2014-06-30 Nitto Denko Corp 偏光フィルムの製造方法

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111095054A (zh) * 2017-09-13 2020-05-01 日东电工株式会社 偏振片、偏振片卷、及偏振膜的制造方法
CN111095053A (zh) * 2017-09-13 2020-05-01 日东电工株式会社 偏振片、偏振片卷、及偏振膜的制造方法
CN111095052A (zh) * 2017-09-13 2020-05-01 日东电工株式会社 偏振片、偏振片卷、及偏振膜的制造方法
CN111095056A (zh) * 2017-09-13 2020-05-01 日东电工株式会社 偏振片、偏振片卷、及偏振膜的制造方法
CN111316141A (zh) * 2017-09-13 2020-06-19 日东电工株式会社 偏振片、偏振片卷、及偏振膜的制造方法
JP2021033086A (ja) * 2019-08-26 2021-03-01 日東電工株式会社 偏光フィルムの乾燥装置及び乾燥方法
JP7377024B2 (ja) 2019-08-26 2023-11-09 日東電工株式会社 偏光フィルムの乾燥装置並びにその乾燥方法及び製造方法
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

Also Published As

Publication number Publication date
TWI762455B (zh) 2022-05-01
CN108351453A (zh) 2018-07-31
TW201723541A (zh) 2017-07-01
JP6942055B2 (ja) 2021-09-29
JPWO2017078092A1 (ja) 2018-08-23
KR20170052991A (ko) 2017-05-15
KR20180066100A (ko) 2018-06-18
CN108351453B (zh) 2022-07-15

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