WO2015125630A1 - 偏光性積層フィルム及び偏光板の製造方法 - Google Patents

偏光性積層フィルム及び偏光板の製造方法 Download PDF

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Publication number
WO2015125630A1
WO2015125630A1 PCT/JP2015/053345 JP2015053345W WO2015125630A1 WO 2015125630 A1 WO2015125630 A1 WO 2015125630A1 JP 2015053345 W JP2015053345 W JP 2015053345W WO 2015125630 A1 WO2015125630 A1 WO 2015125630A1
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WO
WIPO (PCT)
Prior art keywords
film
layer
base film
polarizing plate
polyvinyl alcohol
Prior art date
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PCT/JP2015/053345
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English (en)
French (fr)
Japanese (ja)
Inventor
雄一朗 九内
Original Assignee
住友化学株式会社
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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 CN201580009025.0A priority Critical patent/CN106030352B/zh
Priority to KR1020167023027A priority patent/KR102406825B1/ko
Publication of WO2015125630A1 publication Critical patent/WO2015125630A1/ja

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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
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers

Definitions

  • the coating method is usually a step of forming a resin layer on a base film by coating; a step of drawing and dyeing this resin layer as a polarizer layer to obtain a polarizing laminated film; on the polarizing layer of the polarizing laminated film A step of bonding a protective film to the substrate; and a step of peeling and removing the base film after bonding of the protective film.
  • this method it is possible to easily realize the thinning of the polarizer layer, and hence the polarizing plate, and the thin film polarizer layer and the resin layer serving as a precursor thereof are always supported by the base film or the protective film and are used alone. Since it is not handled by the film, it is excellent in handling of the film during the process.
  • the polarizing plate is required to have durability against a heat shock test (cooling shock test) in order to guarantee stability against a rapid temperature difference that can be exposed when mounted on a display device or the like.
  • the heat shock test is a test in which exposure to a low temperature environment (eg, about -40 to -30 ° C) for a certain period of time and then exposure to a high temperature environment (eg, about 70 to 85 ° C) for a certain period of time are repeated alternately. is there.
  • the predetermined time is usually 30 to 60 minutes, and when “low temperature ⁇ high temperature ⁇ ” is one cycle, it is usually repeated 50 to 400 cycles.
  • the object of the present invention is to form a polarizing laminate film by forming a polarizer layer on a substrate film as in the above-mentioned coating method, and further to produce a polarizing plate using this, in a heat shock test. It is providing the method for manufacturing the light-polarizing laminated film which can give the polarizing plate which is hard to produce.
  • the polarizing plate according to [9] comprising an adhesive layer laminated on at least one surface.
  • a polarizing laminated film is produced by a predetermined method, and a polarizing plate is produced using the film. Therefore, the polarizing plate is less likely to crack in the heat shock test and has high durability against a sudden temperature difference.
  • a display device can be provided.
  • the light-polarizing laminated film in this invention means a thing provided with the base material film and the polarizer layer laminated
  • polarizing laminated film with protective film Also called “film”.
  • the arithmetic average roughness Ra 0 of the surface of the base film 30 on which the polyvinyl alcohol-based resin layer 6 is formed (which may be one or both surfaces of the base film 30) is 130 nm or less.
  • the arithmetic average roughness Ra 0 is preferably 120 nm or less, more preferably 100 nm or less, and even more preferably 80 nm or less.
  • the arithmetic average roughness Ra 0 (the same applies to Ra 1 and Ra 2 described later) is an index that defines the surface roughness defined by JIS B 0601-2001. According to this, it can be said that a thing with large arithmetic average roughness has many surface irregularities and / or a thing with large.
  • the arithmetic average roughness is usually a statistical value in units of length (mainly nm) since it is calculated by calculating a difference in height from the average height of each raw point. Arithmetic mean roughness can be calculated easily by, for example, obtaining surface images with a confocal microscope such as PL ⁇ 2300 sold by Senso Co., Ltd., and then performing statistical processing using the attached software. Obtainable.
  • the temperature difference is preferably 100 ° C. or higher, more preferably 240 ° C. or higher, and further preferably higher than 240 ° C., although it depends on the type of thermoplastic resin used. Even in the case of using an amorphous thermoplastic resin, the cooling process of the resin greatly affects the surface irregularities of the base film 30, so that the temperature difference is preferably as large as possible.
  • the drying temperature and drying time of the coating layer are set according to the type of solvent contained in the coating solution.
  • the drying temperature is, for example, 50 to 200 ° C., preferably 60 to 150 ° C.
  • the drying temperature is preferably 80 ° C. or higher.
  • a zone heating method for example, a method in which hot air is blown and heated in a stretching zone such as a heating furnace adjusted to a predetermined temperature
  • a heater heating method a method in which infrared heaters, halogen heaters, panel heaters, etc. are installed above and below the laminated film 100 and heated by radiant heat.
  • the zone heating method is preferable from the viewpoint of the uniformity of the stretching temperature.
  • a heat setting treatment step may be provided after the stretching treatment in the stretching step S20.
  • the heat setting process is a process in which heat treatment is performed at a temperature equal to or higher than the crystallization temperature while maintaining the tensioned state with the end of the stretched film 200 held by a clip.
  • the crystallization of the polyvinyl alcohol-based resin layer 6 ' is promoted by this heat setting treatment.
  • the temperature of the heat setting treatment is preferably in the range of ⁇ 0 ° C. to ⁇ 80 ° C. of the stretching temperature, and more preferably in the range of ⁇ 0 ° C. to ⁇ 50 ° C. of the stretching temperature.
  • the ratio of iodine to potassium iodide is preferably in the range of 1: 5 to 1: 100, more preferably in the range of 1: 6 to 1:80. Preferably, it is in the range of 1: 7 to 1:70.
  • the temperature of the dyeing solution is preferably in the range of 10 to 60 ° C, more preferably in the range of 20 to 40 ° C.
  • sucked to a polyvinyl alcohol-type resin layer can be orientated favorably.
  • the dyeing step S30 is performed after the laminated film 100 is subjected to at least some stretching treatment. That is, the stretched film 200 obtained by subjecting the stretching process to the target magnification in the stretching process S20 can be used for the dyeing process S30, and after performing the stretching process at a lower ratio than the target in the stretching process S20. In the dyeing step S30, the stretching process can be performed until the total stretching ratio reaches the target ratio.
  • the polarizing plate In the heat shock test, the polarizing plate is very high every time the cycle is repeated due to the contraction force of the polarizer layer to contract and the distortion caused by the complicated movement of the layers arranged around it. Internal stress is generated.
  • the crack of the polarizer layer is a problem that the polarizer layer is broken along the orientation direction of the polyvinyl alcohol resin highly oriented by the internal stress.
  • the portion where the void portion exists cannot enjoy the reinforcing effect by the protective film or the glass substrate via the adhesive layer or the pressure-sensitive adhesive layer, the portion exists as a weak portion particularly in the polarizing plate, It is thought that it is easy to become a starting point.
  • a gap of about several ⁇ m can be detected in the cracked portion. As described above, since this gap is not at a level that can be detected by human eyes or a defect inspection instrument, it is difficult to take measures such as eliminating a polarizing plate having a gap as a defective product. is there.
  • the minute surface unevenness of an invisible level of less than several tens of ⁇ m which is the focus of the present invention (for example, a small surface unevenness of 50 ⁇ m or less and including nano-order minute surface unevenness) ) Can cause cracks in the heat shock test regardless of whether the surface is disposed on the glass substrate side or on the opposite side.
  • the material constituting the first protective film 10 is preferably a light-transmitting (preferably optically transparent) thermoplastic resin.
  • a resin include a chain polyolefin resin (polypropylene resin). Resins), polyolefin resins such as cyclic polyolefin resins (norbornene resins, etc.); cellulose ester resins such as cellulose triacetate and cellulose diacetate; polyester resins; polycarbonate resins; (meth) acrylic resins; Examples thereof include polystyrene resins; or mixtures and copolymers thereof.
  • Cyclic polyolefin-based resin is a general term for resins that are polymerized using cyclic olefins as polymerization units.
  • Specific examples of cyclic polyolefin resins include ring-opening (co) polymers of cyclic olefins, addition polymers of cyclic olefins, copolymers of cyclic olefins and chain olefins such as ethylene and propylene (typically Are random copolymers), graft polymers obtained by modifying them with unsaturated carboxylic acids or derivatives thereof, and hydrides thereof.
  • norbornene resins using norbornene monomers such as norbornene and polycyclic norbornene monomers as cyclic olefins are preferably used.
  • a surface treatment layer such as a hard coat layer, an antiglare layer, an antireflection layer, an antistatic layer and an antifouling layer is formed on the surface of the first protective film 10 opposite to the polarizer layer 5.
  • the method for forming the surface treatment layer on the surface of the protective film is not particularly limited, and a known method can be used.
  • Polyvinyl alcohol resins include vinyl alcohol homopolymers obtained by saponifying polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith.
  • a polyvinyl alcohol copolymer obtained by saponifying the polymer or a modified polyvinyl alcohol polymer obtained by partially modifying the hydroxyl group thereof can be used.
  • the water-based adhesive can contain additives such as polyvalent aldehydes, water-soluble epoxy compounds, melamine compounds, zirconia compounds, and zinc compounds.
  • a water-based adhesive is applied to the bonding surface of the polarizer layer 5 and / or the first protective film 10 of the polarizing laminated film 300, and these films are bonded via the adhesive layer, preferably a bonding roll.
  • a pasting process is carried out by applying pressure and making close contact with each other.
  • the coating method of the water-based adhesive (same for the photo-curable adhesive) is not particularly limited, and casting method, Meyer bar coating method, gravure coating method, comma coater method, doctor plate method, die coating method, dip coating method A conventionally known method such as a spraying method can be used.
  • drying can be performed, for example, by introducing the film into a drying furnace.
  • the drying temperature (drying furnace temperature) is preferably 30 to 90 ° C.
  • the drying time can be about 10 to 1000 seconds, and from the viewpoint of productivity, it is preferably 60 to 750 seconds, and more preferably 150 to 600 seconds.
  • the photocurable adhesive refers to an adhesive that is cured by irradiating light such as ultraviolet rays, for example, an adhesive containing a polymerizable compound and a photopolymerization initiator, an adhesive containing a photoreactive resin, a binder resin, and The thing containing a photoreactive crosslinking agent etc. can be mentioned.
  • the polymerizable compound include photopolymerizable monomers such as a photocurable epoxy monomer, a photocurable acrylic monomer, and a photocurable urethane monomer, and oligomers derived from the photopolymerizable monomer.
  • the difference between the arithmetic average roughness Ra 1 and the arithmetic average roughness Ra 2 is preferably 15 nm or less in absolute value, and more preferably 12 nm or less.
  • the arithmetic average roughness Ra 1 is preferably 55 nm or less, and more preferably 50 nm or less.
  • a reflective polarizing film that transmits a certain kind of polarized light and reflects polarized light that shows the opposite property; anti-glare having an uneven shape on the surface
  • a film with a function a film with a surface antireflection function; a reflection film having a reflection function on the surface; a transflective film having both a reflection function and a transmission function; and a viewing angle compensation film.
  • the base film surface on the side where the polyvinyl alcohol-based resin layer is formed had an arithmetic average roughness Ra 0 of 55.0 nm.
  • the arithmetic average roughness Ra 2 of the surface on the side opposite to the base film in the polarizer layer was measured and found to be 38.5 nm.
  • a protective film [consisting of triacetyl cellulose (TAC) is used.
  • a transparent protective film (“KC4UY” manufactured by Konica Minolta Opto Co., Ltd.), thickness 40 ⁇ m] is pasted and dried in an oven at 80 ° C. for 2 minutes to form a base film / primer layer / polarizer layer / adhesive layer /
  • the polarizing laminated film with a protective film which consists of protective films was obtained.
  • the base film was peeled off from the polarizing laminated film with a protective film.
  • the base film was easily peeled off to obtain a polarizing plate with a single-side protective film.
  • the thickness of the polarizer layer was 6.7 ⁇ m.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
PCT/JP2015/053345 2014-02-19 2015-02-06 偏光性積層フィルム及び偏光板の製造方法 WO2015125630A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201580009025.0A CN106030352B (zh) 2014-02-19 2015-02-06 偏振性层叠膜及偏振板的制造方法
KR1020167023027A KR102406825B1 (ko) 2014-02-19 2015-02-06 편광성 적층 필름 및 편광판의 제조 방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014029691A JP6235370B2 (ja) 2014-02-19 2014-02-19 偏光性積層フィルム及び偏光板の製造方法
JP2014-029691 2014-02-19

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WO2015125630A1 true WO2015125630A1 (ja) 2015-08-27

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JP (1) JP6235370B2 (zh)
KR (1) KR102406825B1 (zh)
CN (1) CN106030352B (zh)
TW (1) TWI657275B (zh)
WO (1) WO2015125630A1 (zh)

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JP2017097283A (ja) * 2015-11-27 2017-06-01 コニカミノルタ株式会社 光学積層フィルムとその製造方法、偏光板及び液晶表示装置
CN108121027A (zh) * 2016-11-28 2018-06-05 住友化学株式会社 带保护膜的偏振性层叠膜的制造方法和偏振板的制造方法

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JP6737609B2 (ja) * 2016-03-22 2020-08-12 日東電工株式会社 粘着剤層付の片保護偏光フィルムの製造方法
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JP6166431B1 (ja) * 2016-06-17 2017-07-19 住友化学株式会社 偏光板およびその製造方法ならびに画像表示装置
TWI634008B (zh) * 2016-12-30 2018-09-01 住華科技股份有限公司 光學膜組件以及其用途
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TWI830706B (zh) * 2017-09-14 2024-02-01 日商可樂麗股份有限公司 偏光薄膜保護用積層體及其製造方法
JP7025166B2 (ja) * 2017-09-28 2022-02-24 住友化学株式会社 偏光板及びその製造方法、並びに表示装置
JP7177590B2 (ja) * 2017-12-07 2022-11-24 日東電工株式会社 偏光フィルムの製造方法及び偏光フィルムの製造装置
JP7288306B2 (ja) 2018-02-26 2023-06-07 日東電工株式会社 偏光フィルムおよびその製造方法、光学フィルム、ならびに画像表示装置
CN109671869B (zh) * 2018-12-12 2020-06-16 武汉华星光电半导体显示技术有限公司 复合膜层的制作方法及显示器件
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CN108121027B (zh) * 2016-11-28 2022-03-18 住友化学株式会社 带保护膜的偏振性层叠膜的制造方法和偏振板的制造方法

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JP6235370B2 (ja) 2017-11-22
TW201539061A (zh) 2015-10-16
TWI657275B (zh) 2019-04-21
CN106030352A (zh) 2016-10-12
KR102406825B1 (ko) 2022-06-10
CN106030352B (zh) 2019-04-05
KR20170013200A (ko) 2017-02-06
JP2015152911A (ja) 2015-08-24

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