WO2019225183A1 - 円偏光板および画像表示装置 - Google Patents

円偏光板および画像表示装置 Download PDF

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Publication number
WO2019225183A1
WO2019225183A1 PCT/JP2019/015371 JP2019015371W WO2019225183A1 WO 2019225183 A1 WO2019225183 A1 WO 2019225183A1 JP 2019015371 W JP2019015371 W JP 2019015371W WO 2019225183 A1 WO2019225183 A1 WO 2019225183A1
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WIPO (PCT)
Prior art keywords
clip
film
polarizing plate
retardation
stretching
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PCT/JP2019/015371
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English (en)
French (fr)
Japanese (ja)
Inventor
清水　享
貴博 吉川
済木　雄二
Original Assignee
日東電工株式会社
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Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to SG11202011437PA priority Critical patent/SG11202011437PA/en
Priority to KR1020207033322A priority patent/KR102613502B1/ko
Priority to KR1020237042662A priority patent/KR20230173215A/ko
Priority to CN201980033934.6A priority patent/CN112154359B/zh
Publication of WO2019225183A1 publication Critical patent/WO2019225183A1/ja

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • 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
    • 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
    • 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
    • G02F1/133541—Circular polarisers
    • 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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • 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
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements

Definitions

  • the present invention relates to a circularly polarizing plate and an image display device.
  • organic EL display devices equipped with organic EL panels have been proposed.
  • the organic EL panel has a highly reflective metal layer, and is likely to cause problems such as external light reflection and background reflection.
  • it is known to prevent these problems by providing a circularly polarizing plate on the viewing side.
  • It is also known to improve the viewing angle by providing a circularly polarizing plate on the viewing side of the liquid crystal display panel.
  • the conventional circularly polarizing plate has a problem that undesired coloring may occur in the reflected hue.
  • the present invention has been made in order to solve the above-described conventional problems, and its main object is to provide a circularly polarizing plate having a neutral reflection hue and an image display device including such a circularly polarizing plate. It is in.
  • the circularly polarizing plate of the present invention includes a polarizer, a retardation layer, and an adhesive layer, and an angle formed between the absorption axis of the polarizer and the slow axis of the retardation layer is 39 ° to 51 °.
  • at least one of the polarizer, the retardation layer, and the pressure-sensitive adhesive layer contains a dye compound having a maximum absorption wavelength of an absorption spectrum in a wavelength region of 650 nm or more.
  • the in-plane retardation of the retardation layer satisfies Re (450) / Re (550)> 1.
  • the in-plane retardation of the retardation layer satisfies 1.1> Re (450) / Re (550)> 1.
  • the in-plane retardation of the retardation layer satisfies 115 nm ⁇ Re (550) ⁇ 135 nm.
  • the pressure-sensitive adhesive layer contains the dye compound.
  • the retardation layer is composed of a retardation film having an alicyclic structure. According to another aspect of the present invention, an image display device is provided.
  • the image display device includes the circularly polarizing plate.
  • a circularly polarizing plate including a polarizer, a retardation layer, and an adhesive layer
  • at least one of the polarizer, the retardation layer, and the adhesive layer has a maximum absorption wavelength of an absorption spectrum.
  • Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the direction orthogonal to the slow axis in the plane (ie, the fast axis direction). “Nz” is the refractive index in the thickness direction.
  • Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the direction orthogonal to the slow axis in the plane (ie, the fast axis direction). “Nz” is the refractive index in the thickness direction.
  • In-plane retardation (Re) “Re ( ⁇ )” is an in-plane retardation measured with light having a wavelength of ⁇ nm at 23 ° C.
  • Re (550) is an in-plane retardation measured with light having a wavelength of 550 nm at 23 ° C.
  • FIG. 1 is a schematic cross-sectional view of a circular polarizing plate according to one embodiment of the present invention.
  • the circularly polarizing plate 100 includes a polarizer 10, a retardation layer 20, and an adhesive layer 30.
  • the angle formed by the absorption axis of the polarizer 10 and the slow axis of the retardation layer 20 is 39 ° to 51 °.
  • At least one of the polarizer 10, the retardation layer 20, and the pressure-sensitive adhesive layer 30 includes a dye compound that exists in a wavelength region where the maximum absorption wavelength of the absorption spectrum is 650 nm or more. Thereby, the reflective hue of a circularly-polarizing plate can be brought close to neutral. In the example shown in FIG.
  • the configuration of the circularly polarizing plate 100 is not limited to the configuration in the illustrated example.
  • the circularly polarizing plate 100 may have a protective layer for the polarizer 10 and / or another retardation layer other than the retardation layer 20.
  • the circularly polarizing plate 100 can have a plurality of pressure-sensitive adhesive layers, and the pressure-sensitive adhesive layer can be disposed at any appropriate position.
  • at least one of the pressure-sensitive adhesive layers of the circularly polarizing plate 100 includes a dye compound.
  • the in-plane retardation of the retardation layer 20 preferably satisfies 115 nm ⁇ Re (550) ⁇ 135 nm.
  • the retardation layer 20 is comprised by the retardation film which has an alicyclic structure.
  • the in-plane retardation of the retardation layer preferably satisfies the relationship of Re (450) / Re (550)> 1. That is, the retardation layer has a positive chromatic dispersion characteristic in which the in-plane retardation value is smaller as the wavelength of the measurement light is larger, or a flat chromatic dispersion characteristic in which the in-plane retardation value hardly changes regardless of the wavelength of the measurement light. Show.
  • the in-plane retardation of the retardation layer more preferably satisfies the relationship 1.1> Re (450) / Re (550)> 1. That is, the retardation layer exhibits flat wavelength dispersion characteristics.
  • a retardation layer that exhibits positive chromatic dispersion characteristics or flat chromatic dispersion characteristics can be made thinner to obtain a desired in-plane retardation value than a retardation layer that exhibits reverse wavelength dispersion characteristics.
  • the bending elasticity of the circularly polarizing plate is inversely proportional to the cube of the thickness of the circularly polarizing plate, the thinner the circularly polarizing plate, the better the bending resistance. Therefore, a circularly polarizing plate using a retardation layer exhibiting positive wavelength dispersion characteristics or flat wavelength dispersion characteristics is thin and has excellent bending resistance.
  • Such a circularly polarizing plate can be suitably used for a bendable image display device.
  • a retardation layer exhibiting a positive chromatic dispersion characteristic or a flat chromatic dispersion characteristic may cause undesired coloring in the reflected hue as compared to a retardation layer exhibiting a reverse chromatic dispersion characteristic.
  • the reflective hue can be made closer to neutral by having the dye compound in any of the layers constituting the circularly polarizing plate. Therefore, the circularly polarizing plate of the present embodiment has excellent bending resistance and can realize a neutral reflection hue.
  • the dye compound is present in the wavelength region where the maximum absorption wavelength of the absorption spectrum is 650 nm or more.
  • the maximum absorption wavelength of the absorption spectrum of the dye compound is preferably in the wavelength region of 650 nm to 750 nm, more preferably in the wavelength region of 670 nm to 730 nm.
  • the half width of absorption of the dye compound is preferably 120 nm or less, more preferably 5 nm to 110 nm.
  • the half width of absorption of the dye compound can be measured from the transmission absorption spectrum of the solution of the dye compound under the following measurement conditions using an ultraviolet-visible spectrophotometer (U-4100, manufactured by Hitachi High-Tech Science Co., Ltd.). Typically, from the spectrum measured by adjusting the concentration so that the absorbance at the maximum absorption wavelength is 1.0, the wavelength interval (full width at half maximum) between two points at 50% of the peak value is expressed as the dye compound.
  • the dye compound is not particularly limited as long as the compound has a maximum absorption wavelength in the absorption spectrum in the above wavelength range.
  • the dye compound include an organic dye compound and an inorganic dye compound. Among these, an organic dye compound is preferable from the viewpoint of maintaining dispersibility and transparency.
  • the coloring compound may be used alone or in combination of two or more.
  • the dye compound examples include imonium, nickel dithiol, phthalocyanine, cyanine, azo, quinophthalone, indigo, and porphyrin.
  • the dye compound commercially available compounds can be preferably used.
  • the phthalocyanine compound examples include FDR-003 (manufactured by Yamada Chemical Co., Ltd.) and FDR-004 (Yamada Chemical Industry Co., Ltd.). Manufactured). Details of the dye compound are described in, for example, JP-A-2016-188357, and the description is incorporated herein by reference.
  • the content of the dye compound in the pressure-sensitive adhesive layer is preferably 0.01 to 10 parts by weight with respect to 100 parts by weight of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer. More preferably, it is about 0.05 to 5 parts by weight.
  • the in-plane retardation of the retardation layer preferably satisfies the relationship of Re (450) / Re (550)> 1, more preferably 1.1> Re (450) / Re. (550)> 1 is satisfied.
  • the in-plane retardation of the retardation layer preferably satisfies 115 nm ⁇ Re (550) ⁇ 135 nm.
  • the Re (550) of the retardation layer is more preferably 118 nm to 132 nm, and further preferably 120 nm to 130 nm.
  • the thickness of the retardation layer is preferably 1 ⁇ m to 50 ⁇ m, more preferably 2 ⁇ m to 40 ⁇ m, and further preferably 3 ⁇ m to 30 ⁇ m.
  • the retardation layer is typically composed of a retardation film that satisfies the above characteristics.
  • the retardation film can be formed by stretching any appropriate resin film.
  • the resin forming the retardation film has an alicyclic structure.
  • the resin forming the retardation film include polycarbonate resins, cyclic olefin resins, cellulose resins, polyester resins, polyvinyl alcohol resins, polyamide resins, polyimide resins, polyether resins, polystyrene resins. , Acrylic resins and polyester carbonate resins.
  • a polycarbonate resin or a cyclic olefin resin can be suitably used.
  • the polycarbonate resin any appropriate polycarbonate resin can be used as long as the effects of the present invention can be obtained.
  • the polycarbonate resin is selected from the group consisting of a structural unit derived from an isosorbide-based dihydroxy compound, alicyclic diol, alicyclic dimethanol, di, tri, or polyethylene glycol, and alkylene glycol or spiro glycol.
  • the polycarbonate resin may contain structural units derived from other dihydroxy compounds as necessary.
  • the details of the polycarbonate resin and retardation film production method that can be suitably used in the present invention are described in, for example, International Publication No. 2011/062239, and the description is incorporated herein by reference.
  • the cyclic olefin-based resin is a general term for resins that are polymerized using a cyclic olefin as a polymerization unit, and is described in, for example, JP-A-1-240517, JP-A-3-14882, JP-A-3-122137, and the like. Resin. Specific examples include ring-opening (co) polymers of cyclic olefins, addition polymers of cyclic olefins, copolymers of cyclic olefins and ⁇ -olefins such as ethylene and propylene (typically random copolymers).
  • graft modified products in which these are modified with an unsaturated carboxylic acid or a derivative thereof, and hydrides thereof.
  • the cyclic olefin include norbornene monomers.
  • the norbornene-based monomer include monomers described in JP-A-2015-210459.
  • As the cyclic olefin resin various products are commercially available. Specific examples include trade names “ZEONEX” and “ZEONOR” manufactured by ZEON CORPORATION, “Arton” manufactured by JSR, “TOPAS” trade name manufactured by TICONA, and trade names manufactured by Mitsui Chemicals, Inc. “APEL” may be mentioned.
  • Any appropriate method including a resin film stretching step can be adopted as a method for producing a retardation film.
  • the stretching method include lateral uniaxial stretching (fixed end biaxial stretching), sequential biaxial stretching, and oblique stretching.
  • the stretching temperature is preferably 125 to 160 ° C, more preferably 130 to 150 ° C.
  • the retardation film is produced by uniaxially stretching a resin film or uniaxially stretching a fixed end.
  • the fixed end uniaxial stretching there is a method of stretching in the width direction (lateral direction) while running the resin film in the longitudinal direction.
  • the draw ratio is preferably 1.1 to 3.5 times.
  • the retardation film is produced by continuously and obliquely stretching a long resin film in the direction of an angle ⁇ with respect to the longitudinal direction.
  • a long stretched film having an orientation angle of ⁇ with respect to the longitudinal direction of the film can be obtained.
  • the manufacturing process can be simplified.
  • Examples of the stretching machine used for the oblique stretching include a tenter type stretching machine capable of adding feed forces, pulling forces, or pulling forces at different speeds in the lateral and / or longitudinal directions.
  • the tenter type stretching machine includes a horizontal uniaxial stretching machine, a simultaneous biaxial stretching machine, and the like, but any suitable stretching machine can be used as long as a long resin film can be continuously stretched obliquely.
  • the method for producing a retardation film by oblique stretching includes gripping the left and right ends of the film with variable-pitch left and right clips each having a variable longitudinal clip pitch (holding step); preheating the film (Preheating step): While increasing the distance between the left and right clips, increasing the clip pitch of one clip and decreasing the clip pitch of the other clip, the film is stretched diagonally (first Obliquely extending step); while increasing the distance between the left and right clips, the clip pitch of the one clip is maintained or reduced so that the clip pitches of the left and right clips are equal, and the clip of the other clip Increasing the pitch and obliquely stretching the film (second oblique stretching step); and gripping the film Releasing the clip (releasing step); may include.
  • each step will be described in detail.
  • FIG. 2 is a schematic plan view illustrating the overall configuration of an example of a stretching apparatus that can be used in the method for producing a retardation film.
  • 3 and 4 are each a schematic plan view of a main part for explaining a link mechanism for changing the clip pitch in the stretching device of FIG. 2, FIG. 3 shows a state where the clip pitch is minimum, and FIG. Indicates the maximum clip pitch.
  • the stretching device 100 has an endless loop 10L and an endless loop 10R having a large number of clips 20 for gripping the film on both the left and right sides in a plan view.
  • the left endless loop as viewed from the film entrance side is referred to as the left endless loop 10L
  • the right endless loop is referred to as the right endless loop 10R.
  • the clips 20 of the left and right endless loops 10L and 10R are guided by the reference rail 70 and move in a loop.
  • the left endless loop 10R moves in a counterclockwise direction
  • the right endless loop 10R moves in a clockwise direction.
  • a gripping zone A, a preheating zone B, a first oblique stretching zone C, a second oblique stretching zone D, and a release zone E are provided in this order from the entrance side to the exit side of the sheet. .
  • Each of these zones means a zone where the film to be stretched is substantially gripped, preheated, first obliquely stretched, second obliquely stretched and released, and mechanically and structurally independent. It does not mean a parcel. It should also be noted that the ratio of the lengths of the respective zones in the stretching apparatus of FIG. 2 is different from the actual length ratio.
  • the left and right endless loops 10R and 10L are configured to be substantially parallel to each other at a separation distance corresponding to the initial width of the film to be stretched.
  • the separation distance of the left and right endless loops 10R and 10L corresponds to the width after stretching of the film as it goes from the preheating zone B toward the release zone E. It is configured to gradually expand until.
  • the left and right endless loops 10R and 10L are configured to be substantially parallel to each other at a separation distance corresponding to the width of the film after stretching.
  • the clip of the left endless loop 10L (left clip) 20 and the clip of the right endless loop 10R (right clip) 20 can each move independently.
  • the driving sprockets 11 and 12 of the left endless loop 10L are rotationally driven counterclockwise by the electric motors 13 and 14, and the driving sprockets 11 and 12 of the right endless loop 10R are clocked by the electric motors 13 and 14. It is driven to rotate around.
  • traveling force is applied to the clip carrying member 30 of the drive roller (not shown) engaged with the drive sprockets 11 and 12.
  • the left endless loop 10L cyclically moves in the counterclockwise direction
  • the right endless loop 10R cyclically moves in the clockwise direction.
  • the left endless loop 10L clip (left clip) 20 and the right endless loop 10R clip (right clip) 20 are each of variable pitch type. That is, the left and right clips 20 and 20 can independently change the clip pitch (distance between clips) in the vertical direction (MD) with movement.
  • the variable pitch type can be realized by any appropriate configuration.
  • a link mechanism pin mechanism
  • an elongated rectangular clip carrying member 30 is provided in the lateral direction in plan view for carrying the clips 20 individually.
  • the clip carrying member 30 is formed into a solid frame structure with a closed cross section by an upper beam, a lower beam, a front wall (wall on the clip side), and a rear wall (wall on the side opposite to the clip).
  • the clip carrying member 30 is provided so as to roll on the traveling road surfaces 81 and 82 by the traveling wheels 38 at both ends thereof. 3 and 4, the traveling wheels on the front wall side (the traveling wheels that roll on the traveling road surface 81) are not shown.
  • the traveling road surfaces 81 and 82 are parallel to the reference rail 70 over the entire area.
  • a long hole 31 is formed along the longitudinal direction of the clip carrying member on the rear side (the side opposite to the clip) of the upper and lower beams of the clip carrying member 30, and the slider 32 can slide in the longitudinal direction of the long hole 31. Is engaged.
  • a single first shaft member 33 is vertically provided so as to penetrate the upper beam and the lower beam.
  • a single second shaft member 34 is vertically provided through the slider 32 of the clip carrying member 30.
  • One end of a main link member 35 is pivotally connected to the first shaft member 33 of each clip carrying member 30.
  • the main link member 35 is pivotally connected to the second shaft member 34 of the adjacent clip carrier member 30 at the other end.
  • one end of the sub link member 36 is pivotally connected to the first shaft member 33 of each clip carrying member 30.
  • the sub link member 36 is pivotally connected at the other end to the intermediate portion of the main link member 35 by a pivot shaft 37.
  • a retardation film having a slow axis in an oblique direction (for example, a direction of 45 ° with respect to the longitudinal direction) can be produced by obliquely stretching the film using the stretching apparatus as described above.
  • the gripping zone A the entrance of the film take-in of the stretching apparatus 100
  • the left and right endless loops 10R, 10L are gripped by the clips 20 of the film to be stretched at a constant clip pitch.
  • the film is sent to the preheating zone B by the movement of the endless loops 10 ⁇ / b> R and 10 ⁇ / b> L (substantially, the movement of each clip holding member 30 guided by the reference rail 70).
  • the left and right endless loops 10R, 10L are configured to be substantially parallel to each other at a separation distance corresponding to the initial width of the film to be stretched as described above. Basically, neither transverse stretching nor longitudinal stretching is performed, and the film is heated. However, the distance between the left and right clips (distance in the width direction) may be slightly increased in order to avoid problems such as film deflection due to preheating and contact with the nozzles in the oven.
  • the film is heated to a temperature T1 (° C.). It is preferable that temperature T1 is more than the glass transition temperature (Tg) of a film, More preferably, it is Tg + 2 degreeC or more, More preferably, it is Tg + 5 degreeC or more. On the other hand, the heating temperature T1 is preferably Tg + 40 ° C. or lower, more preferably Tg + 30 ° C. or lower. Depending on the film used, the temperature T1 is, for example, 70 ° C. to 190 ° C., preferably 80 ° C. to 180 ° C.
  • the temperature raising time to the temperature T1 and the holding time at the temperature T1 can be appropriately set according to the constituent material of the film and the manufacturing conditions (for example, the film conveyance speed). These temperature raising time and holding time can be controlled by adjusting the moving speed of the clip 20, the length of the preheating zone, the temperature of the preheating zone, and the like.
  • First oblique stretching step In the first oblique stretching zone (first oblique stretching step) C, the distance between the left and right clips (more specifically, the separation distance between the left and right endless loops 10R and 10L) is increased.
  • the film is stretched obliquely while increasing the clip pitch of one clip and decreasing the clip pitch of the other clip.
  • the left and right clips are moved at different speeds, thereby extending one side edge of the film in the longitudinal direction and contracting the other side edge in the longitudinal direction.
  • the oblique stretching can be performed.
  • a slow axis can be developed with high uniaxiality and in-plane orientation in a desired direction (for example, a direction of 45 ° with respect to the longitudinal direction).
  • the right and left clip pitch are both set to P 1.
  • P 1 is the clip pitch at the time of gripping the film.
  • the clip pitch of one starts to increase, and the clip pitch of the other (left side in the illustrated example) Start decreasing.
  • the first oblique stretching zone C increases the clip pitch of the right clip to the P 2, to reduce the clip pitch of the left clip to the P 3.
  • the clip pitch ratio can generally correspond to the clip moving speed ratio. Therefore, the ratio of the clip pitch of the left and right clips can generally correspond to the ratio of the stretching ratio in the MD direction between the right side edge and the left side edge of the film.
  • both the position where the clip pitch of the right clip begins to increase and the position where the clip pitch of the left clip begins to decrease are both the start of the first diagonally extending zone C, but unlike the illustrated example,
  • the clip pitch of the left clip may begin to decrease after the clip pitch of the right clip begins to increase (eg, FIG. 7), or the clip pitch of the right clip begins to increase after the clip pitch of the left clip begins to decrease Good (not shown).
  • the clip pitch of the clip on one side begins to increase
  • the clip pitch of the clip on the other side begins to decrease. According to such an embodiment, since the film has already been stretched in the width direction to a certain extent (preferably about 1.2 to 2.0 times), the clip pitch on the other side can be greatly reduced. Less likely to wrinkle. Accordingly, a more acute oblique stretching is possible, and a retardation film having high uniaxiality and high in-plane orientation can be suitably obtained.
  • the clip pitch of the right clip continues to increase and the clip pitch of the left clip continues to the end of the first oblique stretching zone C (the start of the second oblique stretching zone D).
  • the increase or decrease of the clip pitch ends before the end of the first oblique stretching zone C and the clip is clipped to the end of the first oblique stretching zone C.
  • the pitch may be maintained as it is.
  • the increasing rate (P 2 / P 1 ) of the increasing clip pitch is preferably 1.25 to 1.75, more preferably 1.30 to 1.70, and still more preferably 1.35 to 1.65.
  • the decreasing rate (P 3 / P 1 ) of the clip pitch to be decreased is, for example, 0.50 or more and less than 1, preferably 0.50 to 0.95, more preferably 0.55 to 0.90, and further preferably 0.55 to 0.85. If the change rate of the clip pitch is within such a range, the slow axis can be expressed with high uniaxiality and in-plane orientation in a direction of approximately 45 degrees with respect to the longitudinal direction of the film.
  • the clip pitch can be adjusted by positioning the slider by adjusting the distance between the pitch setting rail of the stretching device and the reference rail as described above.
  • the draw ratio (W 2 / W 1 ) in the width direction of the film in the first oblique stretching step is preferably 1.1 to 3.0 times, more preferably 1.2 to 2.5 times, and even more preferably. Is 1.25 to 2.0 times. If the draw ratio is less than 1.1 times, tin-like wrinkles may occur at the side edge portion on the contracted side. Moreover, when the said draw ratio exceeds 3.0 times, the biaxiality of the obtained retardation film will become high, and when applied to a circularly-polarizing plate etc., a viewing angle characteristic may fall.
  • the first oblique stretching has a product of the rate of change of the clip pitch of one clip and the rate of change of the clip pitch of the other clip, preferably 0.7 to 1.5, more preferably The reaction is carried out to 0.8 to 1.45, more preferably 0.85 to 1.40.
  • the product of the change rate is within such a range, a retardation film having high uniaxiality and in-plane orientation can be obtained.
  • the first oblique stretching can be typically performed at a temperature T2.
  • the temperature T2 is preferably Tg ⁇ 20 ° C. to Tg + 30 ° C. with respect to the glass transition temperature (Tg) of the resin film, more preferably Tg ⁇ 10 ° C. to Tg + 20 ° C., and particularly preferably about Tg.
  • the temperature T2 is, for example, 70 ° C. to 180 ° C., preferably 80 ° C. to 170 ° C., depending on the resin film used.
  • the difference (T1 ⁇ T2) between the temperature T1 and the temperature T2 is preferably ⁇ 2 ° C. or more, and more preferably ⁇ 5 ° C. or more. In one embodiment, T1> T2, and thus the film heated to temperature T1 in the preheating step can be cooled to temperature T2.
  • Second oblique stretching step In the second oblique stretching zone (second oblique stretching step) D, the distance between the left and right clips (more specifically, the separation distance between the left and right endless loops 10R and 10L) is increased.
  • the film is stretched diagonally while maintaining or decreasing the clip pitch of the clip on one side and increasing the clip pitch of the clip on the other side so that the clip pitch of the left and right clips is equal. In this way, by stretching diagonally while reducing the difference between the left and right clip pitches, it is possible to sufficiently stretch in the diagonal direction while relaxing excess stress.
  • the film can be used in the release process with the left and right clips moving at the same speed, variations in the film transport speed and the like hardly occur when the left and right clips are released, and subsequent film winding is preferable. Can be done.
  • the clip pitch of the left clip starts to increase.
  • the clip pitch of the right clip is maintained at P 2 in the second oblique stretching zone D. Therefore, the end portion of the second oblique stretching zone D in (the beginning of the release zone E), left clip and right clips together, there is a moving clip pitch P 2.
  • the increasing rate (P 2 / P 3 ) of the clip pitch in the above embodiment is not limited as long as a retardation film having desired optical characteristics can be obtained.
  • the rate of change (P 2 / P 3 ) is, for example, 1.3 to 4.0, preferably 1.5 to 3.0.
  • the clip pitch of the right clip starts to decrease and the clip pitch of the left clip starts to increase.
  • the second oblique stretching zone D to reduce the clip pitch of the right clip to P 4, it increases the clip pitch of the left clip to P 4. Therefore, the end portion of the second oblique stretching zone D in (the beginning of the release zone E), left clip and right clips are decided to move together with the clip pitch P 4.
  • the clip pitch decrease start position of the right clip and the clip clip increase start position of the left clip are both set as the start portion of the second diagonally extending zone D, but these positions are different. It may be a position. Similarly, the clip end decrease position of the right clip may be different from the clip end increase position of the left clip.
  • the decreasing rate (P 4 / P 2 ) of the decreasing clip pitch and the increasing rate (P 4 / P 3 ) of the increasing clip pitch in the above embodiment are not limited as long as the effects of the present invention are not impaired.
  • the rate of change (P 4 / P 2 ) is, for example, 0.4 or more and less than 1.0, preferably 0.6 to 0.95.
  • the rate of change (P 4 / P 3 ) is, for example, more than 1.0 and 2.0 or less, preferably 1.2 to 1.8.
  • P 4 is P 1 or more. If P 4 ⁇ P 1 , problems such as wrinkles at the side edges and increased biaxiality may occur.
  • the draw ratio (W 3 / W 2 ) in the width direction of the film in the second oblique stretching step is preferably 1.1 times to 3.0 times, more preferably 1.2 times to 2.5 times, and even more preferably. Is 1.25 to 2.0 times. If the draw ratio is less than 1.1 times, tin-like wrinkles may occur at the side edge portion on the contracted side. Moreover, when the said draw ratio exceeds 3.0 times, the biaxiality of the obtained retardation film will become high, and when applied to a circularly-polarizing plate etc., a viewing angle characteristic may fall.
  • the draw ratio (W 3 / W 1 ) in the width direction in the first oblique stretching step and the second oblique stretching step is preferably 1.2 times to 4.0 times from the same viewpoint as described above. More preferably, it is 1.4 to 3.0 times.
  • the oblique stretching ratio obtained from the following formula (1) is preferably 2.0 or more, more preferably 2.0 to 4.0. More preferably, the reaction is carried out to 2.5 to 3.5. When the oblique stretching ratio is less than 2.0, biaxiality may be increased or in-plane orientation may be decreased.
  • v 3 ′ is the clip moving speed when the clip pitch of the clip is changed to the predetermined clip pitch in the second oblique stretching step, with respect to the clip whose clip pitch is increased in the first oblique stretching step
  • t 3 is the time of the clip towards reducing the clip pitch in a first diagonal drawing step, since the beginning of the preheating zone, to a second diagonal drawing step is completed
  • t 3 ′ represents the time from when the clip whose clip pitch is increased in the first oblique stretching process enters the preheating zone until the second oblique stretching process ends.
  • the predetermined clip pitch means a clip pitch after the clip pitch that has been increased in the first oblique stretching step is maintained or decreased in the second oblique stretching step
  • the C-3 Corresponds to P 2 or P 4 in the term description.
  • clip pitch of the clips corresponding to P 2 in the description given clip pitch (the C-3 Section in the first diagonal drawing step )
  • the above t 3 is represented by the following formula (2)
  • the above t ′ 3 is represented by the following formula (3).
  • the above t 3 is represented by the following formula (4)
  • the above t ′ 3 is represented by the following formula (5).
  • equations (2) to (4) will be described.
  • FIGS. 10 to 12 can be referred to.
  • the asterisk mark (*) in the equations (1) to (5) is a multiplication symbol.
  • the unit of film width is m
  • the unit of speed is m / sec
  • the unit of distance is m
  • the unit of time is sec.
  • v1 is the clip moving speed when the clip whose clip pitch is reduced in the first oblique stretching process passes through the preheating zone, v2 with respect clips towards reducing the clip pitch in a first diagonal drawing step, corresponding to P 3 in the clip pitch of the clip described in the first predetermined clip pitch oblique stretching process
  • the C-3 Section Clip movement speed when reduced to v3 is a clip whose clip pitch is reduced in the first oblique stretching step, the clip pitch of the clip is a predetermined clip pitch in the second oblique stretching step (P 2 or P in the description of the above section C-3).
  • L2 is the distance from the preheating zone inlet to the point where the clip whose clip pitch is reduced in the first oblique stretching step begins to increase the clip pitch (in one embodiment, from the preheating zone inlet to the first diagonal Distance to the stretching zone exit)
  • L3 is the distance from the preheating zone inlet to the point where the clip whose clip pitch is reduced in the first oblique stretching step finishes increasing the clip pitch (in one embodiment, from the preheating zone inlet to the second diagonal Distance to the exit of the drawing zone) It is. )
  • v1 ′ is the clip moving speed when the clip that increases the clip pitch in the first oblique stretching process passes through the preheating zone, v2 ', with respect to the clip towards increasing the clip pitch in a first diagonal drawing step, the P 2 in the clip pitch of the clip described in the first predetermined clip pitch oblique stretching process (the C-3 Section The clip moving speed v3 ′ when the clip passes through the second oblique stretching zone with respect to the clip that increases the clip pitch in the first oblique stretching step.
  • L1 ′ is the distance from the preheating zone inlet to the clip that increases the clip pitch in the first oblique stretching step until the clip pitch begins to increase (in one embodiment, from the preheating zone inlet to the preheating zone outlet).
  • Distance) L2 ′ is the distance from the preheating zone inlet to the point where the clip that increases the clip pitch in the first oblique stretching step finishes increasing the clip pitch (in one embodiment, the first heating zone inlet (Distance to the diagonal stretching zone exit)
  • L3 ′ is the distance from the preheating zone entrance to the second oblique stretching zone exit.
  • v1 ′ is the clip moving speed when the clip that increases the clip pitch in the first oblique stretching process passes through the preheating zone, v2 ', with respect to the clip towards increasing the clip pitch in a first diagonal drawing step, the P 2 in the clip pitch of the clip described in the first predetermined clip pitch oblique stretching process (the C-3 Section).
  • the clip moving speed v3 ′ when the clip pitch of the clip is increased in the first oblique stretching step is set to a predetermined clip pitch (2) in the second oblique stretching step.
  • L1 ′ is the distance from the preheat zone inlet to the point where the clip that increases the clip pitch in the first oblique stretching step begins to increase the clip pitch
  • L2 ′ is the distance from the preheating zone inlet to the point where the clip that increases the clip pitch in the first oblique stretching step finishes increasing the clip pitch
  • L3 ′ indicates that the clip that increases the clip pitch in the first oblique stretching step from the preheating zone entrance is set to a predetermined clip pitch in the second oblique stretching step (P 4 in the description of the above section C-3). (In one embodiment, the distance from the preheating zone inlet to the second oblique stretching zone outlet). )
  • the second oblique stretching can be typically performed at a temperature T3.
  • the temperature T3 may be equivalent to the temperature T2.
  • the heat treatment can typically be performed at a temperature T4.
  • the temperature T4 varies depending on the stretched film, and may be T3 ⁇ T4 or T3 ⁇ T4. In general, when the film is an amorphous material, T3 ⁇ T4, and when the film is a crystalline material, crystallization may be performed by setting T3 ⁇ T4.
  • T3 ⁇ T4 the difference between the temperatures T3 and T4 (T3 ⁇ T4) is preferably 0 ° C. to 50 ° C.
  • the heat treatment time is typically 10 seconds to 10 minutes.
  • the heat-fixed film is usually cooled to Tg or less, and after releasing the clip, the clip gripping portions at both ends of the film are cut and wound.
  • the pressure-sensitive adhesive layer is formed of any appropriate pressure-sensitive adhesive.
  • adhesives include rubber adhesives, acrylic adhesives, silicone adhesives, urethane adhesives, vinyl alkyl ether adhesives, polyvinyl alcohol adhesives, polyvinyl pyrrolidone adhesives, polyacrylamide adhesives.
  • An adhesive, a cellulose adhesive, etc. are mentioned.
  • an acrylic pressure-sensitive adhesive containing a (meth) acrylic polymer as a base polymer is preferably used.
  • an adhesive layer contains a pigment compound.
  • (Meth) acrylic polymer contains alkyl (meth) acrylate as a main component as a monomer unit.
  • alkyl (meth) acrylate examples include those having a linear or branched alkyl group having 1 to 24 carbon atoms at the ester terminal.
  • Alkyl (meth) acrylate can be used individually by 1 type or in combination of 2 or more types. “Alkyl (meth) acrylate” refers to alkyl acrylate and / or alkyl methacrylate.
  • the alkyl (meth) acrylate having an alkyl group having 1 to 24 carbon atoms at the ester end is preferably 40% by weight or more based on the total amount of the monofunctional monomer component forming the (meth) acrylic polymer, More preferably, it is more than 60% by weight.
  • the monomer component may contain a copolymerization monomer other than alkyl (meth) acrylate as a monofunctional monomer component.
  • a copolymerization monomer can be used as the remainder of the alkyl (meth) acrylate in a monomer component.
  • a cyclic nitrogen-containing monomer may be included.
  • said cyclic nitrogen containing monomer what has a polymerizable functional group which has unsaturated double bonds, such as a (meth) acryloyl group or a vinyl group, and has a cyclic nitrogen structure can be especially used without a restriction
  • the cyclic nitrogen structure preferably has a nitrogen atom in the cyclic structure.
  • the content of the cyclic nitrogen-containing monomer is preferably 0.5 to 50% by weight, more preferably 0.5 to 40% by weight, based on the total amount of the monofunctional monomer component forming the (meth) acrylic polymer. %, Even more preferably 0.5 to 30% by weight.
  • the monomer component forming the (meth) acrylic polymer may contain other functional group-containing monomers as necessary.
  • Examples of such a monomer include a carboxyl group-containing monomer, a monomer having a cyclic ether group, and a hydroxyl group-containing monomer.
  • (Meth) acrylic polymers having a weight average molecular weight in the range of 500,000 to 3,000,000 are usually used. In view of durability, particularly heat resistance, it is preferable to use those having a weight average molecular weight of 700,000 to 2,700,000. Further, it is preferably 800,000 to 2.5 million. A weight average molecular weight of less than 500,000 is not preferable in terms of heat resistance. On the other hand, if the weight average molecular weight is more than 3 million, a large amount of a diluting solvent is required to adjust the viscosity to be suitable for coating, which is not preferable.
  • the weight average molecular weight is a value measured by GPC (gel permeation chromatography) and calculated in terms of polystyrene.
  • the (meth) acrylic polymer As a method for producing the (meth) acrylic polymer, any appropriate method such as radiation polymerization such as solution polymerization, ultraviolet (UV) polymerization, various radical polymerizations such as bulk polymerization and emulsion polymerization can be employed. Further, the (meth) acrylic polymer obtained may be any of a random copolymer, a block copolymer, a graft copolymer, and the like.
  • the resin film forming the polarizer may be a single-layer resin film or a laminate of two or more layers.
  • polarizers composed of a single-layer resin film include hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and ethylene / vinyl acetate copolymer partially saponified films.
  • PVA polyvinyl alcohol
  • polyene-based oriented films such as those subjected to dyeing treatment and stretching treatment with dichroic substances such as iodine and dichroic dyes, PVA dehydrated products and polyvinyl chloride dehydrochlorinated products.
  • a polarizer obtained by dyeing a PVA film with iodine and uniaxially stretching is used because of excellent optical properties.
  • the dyeing with iodine is performed, for example, by immersing a PVA film in an aqueous iodine solution.
  • the stretching ratio of the uniaxial stretching is preferably 3 to 7 times.
  • the stretching may be performed after the dyeing treatment or may be performed while dyeing. Moreover, you may dye
  • the PVA film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment and the like. For example, by immersing the PVA film in water and washing it before dyeing, not only can the surface of the PVA film be cleaned of dirt and anti-blocking agents, but the PVA film can be swollen to cause uneven staining. Can be prevented.
  • a polarizer obtained by using a laminate a laminate of a resin substrate and a PVA resin layer (PVA resin film) laminated on the resin substrate, or a resin substrate and the resin
  • a polarizer obtained by using a laminate with a PVA resin layer applied and formed on a substrate examples thereof include a polarizer obtained by using a laminate with a PVA resin layer applied and formed on a substrate.
  • a polarizer obtained by using a laminate of a resin base material and a PVA resin layer applied and formed on the resin base material may be obtained by, for example, applying a PVA resin solution to a resin base material and drying it.
  • a PVA-based resin layer is formed thereon to obtain a laminate of a resin base material and a PVA-based resin layer; the laminate is stretched and dyed to make the PVA-based resin layer a polarizer; obtain.
  • stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching.
  • the stretching may further include, if necessary, stretching the laminate in the air at a high temperature (for example, 95 ° C. or higher) before stretching in the aqueous boric acid solution.
  • the obtained resin base material / polarizer laminate may be used as it is (that is, the resin base material may be used as a protective layer of the polarizer), and the resin base material is peeled from the resin base material / polarizer laminate.
  • Any appropriate protective layer according to the purpose may be laminated on the release surface. Details of a method for manufacturing such a polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580. This publication is incorporated herein by reference in its entirety.
  • the thickness of the polarizer is, for example, 1 ⁇ m to 80 ⁇ m. In one embodiment, the thickness of the polarizer is preferably 1 ⁇ m to 25 ⁇ m, more preferably 3 ⁇ m to 10 ⁇ m, and particularly preferably 3 ⁇ m to 8 ⁇ m. When the thickness of the polarizer is in such a range, curling during heating can be satisfactorily suppressed, and good appearance durability during heating can be obtained.
  • the polarizer preferably exhibits absorption dichroism at any wavelength between 380 nm and 780 nm.
  • the single transmittance of the polarizer is 35.0% to 46.0%, preferably 37.0% to 46.0%.
  • the polarization degree of the polarizer is preferably 97.0% or more, more preferably 99.0% or more, and further preferably 99.9% or more.
  • the protective layer is formed of any appropriate protective film that can be used as a film for protecting the polarizer.
  • the material that is the main component of the protective film include cellulose resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone-based, and polysulfone-based materials.
  • transparent resins such as those based on polystyrene, polystyrene, polynorbornene, polyolefin, (meth) acryl, and acetate.
  • thermosetting resins such as (meth) acrylic, urethane-based, (meth) acrylurethane-based, epoxy-based, and silicone-based or ultraviolet curable resins are also included.
  • a glassy polymer such as a siloxane polymer is also included.
  • a polymer film described in JP-A-2001-343529 (WO01 / 37007) can also be used.
  • a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in the side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and nitrile group in the side chain for example, a resin composition having an alternating copolymer of isobutene and N-methylmaleimide and an acrylonitrile / styrene copolymer can be mentioned.
  • the polymer film can be, for example, an extruded product of the resin composition.
  • the thickness of the protective film is preferably 10 ⁇ m to 100 ⁇ m.
  • the protective film may be laminated to the polarizer via an adhesive layer (specifically, an adhesive layer or an adhesive layer), or may be adhered to the polarizer (without an adhesive layer). Good.
  • surface treatment layers such as a hard-coat layer, a glare-proof layer, and an antireflection layer, may be formed in the protective film arrange
  • the circularly polarizing plate described in the items A to F can be used for an image display device. Therefore, the present invention also includes an image display device using such an optical laminate. Typical examples of the image display device include a liquid crystal display device and an organic EL display device.
  • the image display apparatus by embodiment of this invention is equipped with the circularly-polarizing plate as described in said A term to F term.
  • the circularly polarizing plates obtained in the examples and comparative examples were cut into a size of 150 mm length ⁇ 20 mm width, and used as evaluation samples.
  • the evaluation sample is hung on a mandrel with a diameter of 12 mm that is horizontally arranged, with the protective film on the outside, with a metal ball with a diameter of 1 mm sandwiched between the evaluation sample and the mandrel, and evaluation is performed.
  • the sample was held for 10 seconds with a total load of 300 g applied to both ends of the sample. Thereafter, the bending resistance of the circularly polarizing plate was evaluated according to the following criteria.
  • ⁇ No abnormality was observed in the circularly polarizing plate.
  • X A crack occurred in the protective film.
  • Example 1 Production of polarizing plate While uniaxially stretching a long roll of polyvinyl alcohol film (product name “PE6000”, manufactured by Kuraray Co., Ltd.) having a thickness of 60 ⁇ m in a long direction so as to be 5.9 times in the long direction by a roll drawing machine. At the same time, swelling, dyeing, crosslinking, and washing treatment were performed, and finally a drying treatment was performed to produce a polarizer having a thickness of 22 ⁇ m. Specifically, the swelling treatment was stretched 2.2 times while being treated with pure water at 20 ° C. Next, the dyeing treatment is carried out in an aqueous solution at 30 ° C.
  • PE6000 polyvinyl alcohol film
  • the weight ratio of iodine and potassium iodide is 1: 7 so that the transmittance of the produced polarizing film is 43.0%.
  • the film was stretched 1.4 times.
  • the crosslinking treatment employed a two-stage crosslinking treatment, and the first-stage crosslinking treatment was stretched 1.2 times while being treated in an aqueous solution in which boric acid and potassium iodide were dissolved at 40 ° C.
  • the boric acid content of the aqueous solution of the first-stage crosslinking treatment was 5.0% by weight, and the potassium iodide content was 3.0% by weight.
  • the film was stretched 1.6 times while being treated in an aqueous solution in which boric acid and potassium iodide were dissolved at 65 ° C.
  • the boric acid content of the aqueous solution of the second crosslinking treatment was 4.3% by weight, and the potassium iodide content was 5.0% by weight.
  • the cleaning treatment was performed with an aqueous potassium iodide solution at 20 ° C.
  • the potassium iodide content of the aqueous solution for the washing treatment was 2.6% by weight.
  • the drying process was performed at 70 ° C. for 5 minutes to obtain a polarizer.
  • a low-reflection TAC film (thickness: 72 ⁇ m, large) having a hard coat (HC) layer formed on one side of the TAC film by a low-reflection hard coat treatment on one side of the obtained polarizer via a polyvinyl alcohol adhesive.
  • Nippon Printing Co., Ltd. product name “DSG-03HL”) was bonded to obtain a long polarizing plate having a protective film / polarizer configuration.
  • the dye compound-containing pressure-sensitive adhesive was coated on a separator made of a polyester film surface-treated with a silicone release agent, and heat-treated at 155 ° C. for 3 minutes to obtain a pressure-sensitive adhesive layer having a thickness of 20 ⁇ m.
  • 3. Production of Retardation Film With respect to 81.98 parts by mass of isosorbide, 47.19 parts by mass of tricyclodecane dimethanol, 175.1 parts by mass of diphenyl carbonate, and 0.979 parts by mass of 0.2 mass% aqueous solution of cesium carbonate as a catalyst. In a nitrogen atmosphere, the heating tank temperature was heated to 150 ° C., and the raw materials were dissolved while stirring as necessary (about 15). Min).
  • the pressure was changed from normal pressure to 13.3 kPa, and the generated phenol was extracted out of the reaction vessel while the heating bath temperature was increased to 190 ° C. over 1 hour.
  • the pressure in the reaction vessel is set to 6.67 kPa, the heating bath temperature is increased to 230 ° C. in 15 minutes, and the generated phenol is removed. It was extracted out of the reaction vessel. Since the stirring torque of the stirrer increased, the temperature was raised to 250 ° C. in 8 minutes, and the pressure in the reaction vessel was allowed to reach 0.200 kPa or less in order to remove the generated phenol.
  • the preheating temperature and the stretching temperature were 140.5 ° C., and the oblique stretching ratio represented by the formula (1) was 3.0 times.
  • the stretching direction was 45 ° with respect to the longitudinal direction of the film.
  • the film was held at 125 ° C. for 60 seconds for heat setting. After the heat-set film was cooled to 100 ° C., the left and right clips were released.
  • the thickness of the obtained retardation film was 20 ⁇ m, Re (550) was 125 nm, and Re (450) / Re (550) was 1.02. 4).
  • Preparation of a circularly polarizing plate and an organic EL panel The surface of the retardation film was applied to one surface of the retardation film by applying and drying an easy-adhesive composition prepared using a modified polyolefin resin and a PVA resin. An easy-adhesion layer (thickness: 500 nm) was formed.
  • a circularly polarizing plate was obtained by bonding the polarizer-side surface of the polarizing plate to the surface of the retardation film on which the adhesive layer was formed via a water-soluble adhesive mainly composed of PVA resin. The polarizing plate and the retardation film were bonded so that the angle formed between the absorption axis of the polarizer and the slow axis of the retardation film was 45 °.
  • the pressure-sensitive adhesive layer was bonded to the surface of the circularly polarizing plate on the phase difference film side.
  • the organic EL panel of Example 1 is bonded to the viewing side of the organic EL panel of the organic EL display device (product name “55C7P”, manufactured by LG Display) through the pressure-sensitive adhesive layer.
  • the obtained circularly polarizing plate was subjected to the evaluation of (5) above.
  • the obtained organic electroluminescent panel was used for evaluation of said (3) and (4). The results are shown in Table 1.
  • Example 2 A norbornene-based resin film (manufactured by ZEON Corporation, product name “ZF-14”) is stretched at a stretching temperature of 137 ° C. and a stretching ratio of 2.0 times using a lab stretcher (manufactured by Bruckner, KARO IV). Uniaxial stretching was performed to obtain a retardation film. The thickness of the obtained retardation film was 20 ⁇ m, the in-plane retardation Re (550) was 125 nm, and Re (450) / Re (550) was 1.01. A circularly polarizing plate and an organic EL panel were produced in the same manner as in Example 1 except that this retardation film was used. The obtained circularly polarizing plate and organic EL panel were subjected to the same evaluation as in Example 1. The results are shown in Table 1.
  • Example 3 A retardation film was obtained in the same manner as in Example 1 except that a polycarbonate resin film having a thickness of 60 ⁇ m was stretched by setting the preheating temperature and the stretching temperature to 140 ° C. The thickness of the obtained retardation film was 20 ⁇ m, Re (550) was 130 nm, and Re (450) / Re (550) was 1.02. Further, in the same manner as in Example 1 except that 0.5 part by weight of FDR-004 (manufactured by Yamada Chemical Co., Ltd., absorption spectrum maximum absorption wavelength: 712 nm, absorption half-value width: 36 nm) was blended as the dye compound. A pressure-sensitive adhesive layer was obtained.
  • FDR-004 manufactured by Yamada Chemical Co., Ltd., absorption spectrum maximum absorption wavelength: 712 nm, absorption half-value width: 36 nm
  • a circularly polarizing plate and an organic EL panel were produced in the same manner as in Example 1 except that the obtained retardation film and pressure-sensitive adhesive layer were used.
  • the obtained circularly polarizing plate and organic EL panel were subjected to the same evaluation as in Example 1. The results are shown in Table 1.
  • Example 4 A retardation film was obtained in the same manner as in Example 1 except that a polycarbonate resin film having a thickness of 75 ⁇ m was stretched by setting the preheating temperature and the stretching temperature to 144.5 ° C. The thickness of the obtained retardation film was 25 ⁇ m, Re (550) was 125 nm, and Re (450) / Re (550) was 1.02. A circularly polarizing plate and an organic EL panel were produced in the same manner as in Example 1 except that the obtained retardation film was used. The obtained circularly polarizing plate and organic EL panel were subjected to the same evaluation as in Example 1. The results are shown in Table 1.
  • Example 5 A retardation film was obtained in the same manner as in Example 1 except that a polycarbonate resin film having a thickness of 60 ⁇ m was stretched by setting the preheating temperature and the stretching temperature to 141.2 ° C. The thickness of the obtained retardation film was 20 ⁇ m, Re (550) was 120 nm, and Re (450) / Re (550) was 1.02. A circularly polarizing plate and an organic EL panel were produced in the same manner as in Example 1 except that the obtained retardation film was used. The obtained circularly polarizing plate and organic EL panel were subjected to the same evaluation as in Example 1. The results are shown in Table 1.
  • a resin film having a thickness of 135 ⁇ m was produced using a film-forming apparatus equipped with a winder and a preset temperature: 120 to 130 ° C.
  • the polycarbonate resin film was obliquely stretched using a stretching apparatus shown in FIG. 2 to obtain a retardation film.
  • the preheating temperature was 145 ° C.
  • the stretching temperature was 138 ° C.
  • the oblique stretching ratio represented by the formula (1) was 2.94 times.
  • the stretching direction was 45 ° with respect to the longitudinal direction of the film.
  • the film was held at 125 ° C. for 60 seconds for heat setting. After the heat-set film was cooled to 100 ° C., the left and right clips were released.
  • the thickness of the obtained retardation film was 58 ⁇ m, Re (550) was 144 nm, and Re (450) / Re (550) was 0.855.
  • the adhesive layer was obtained like Example 1 except not having mix
  • a circularly polarizing plate and an organic EL panel were produced in the same manner as in Example 1 except that the obtained retardation film and pressure-sensitive adhesive layer were used. The obtained circularly polarizing plate and organic EL panel were subjected to the same evaluation as in Example 1. The results are shown in Table 1.
  • Example 2 A pressure-sensitive adhesive layer was obtained in the same manner as in Example 1 except that no dye compound was added to the pressure-sensitive adhesive composition.
  • a circularly polarizing plate and an organic EL panel were produced in the same manner as in Example 1 except that the obtained adhesive layer was used.
  • the obtained circularly polarizing plate and organic EL panel were subjected to the same evaluation as in Example 1. The results are shown in Table 1.
  • Example 3 In the same manner as in Example 1 except that 0.3 part by weight of FDG-007 (manufactured by Yamada Chemical Co., Ltd., absorption spectrum maximum absorption wavelength: 592 nm, absorption half-value width: 29 nm) was blended as a dye compound. An agent layer was obtained. A circularly polarizing plate and an organic EL panel were produced in the same manner as in Example 1 except that the obtained adhesive layer was used. The obtained circularly polarizing plate and organic EL panel were subjected to the same evaluation as in Example 1. The results are shown in Table 1.
  • the circularly polarizing plate of the comparative example has low bending resistance, or undesired coloring occurs in the reflected hue.
  • the circularly polarizing plate of the example was excellent in bending resistance and the reflection hue was close to neutral.
  • the above-described excellent characteristics can be obtained without significantly reducing the white luminance of the organic EL panel as compared with the circularly polarizing plates of Comparative Examples 1 and 2 that do not contain the dye compound. could be realized.
  • the circularly polarizing plate of the present invention can be suitably used for an image display device such as an organic EL display device.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Polarising Elements (AREA)
  • Electroluminescent Light Sources (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
PCT/JP2019/015371 2018-05-22 2019-04-09 円偏光板および画像表示装置 WO2019225183A1 (ja)

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SG11202011437PA SG11202011437PA (en) 2018-05-22 2019-04-09 Circular polarizing plate and image display device
KR1020207033322A KR102613502B1 (ko) 2018-05-22 2019-04-09 원편광판 및 화상 표시 장치
KR1020237042662A KR20230173215A (ko) 2018-05-22 2019-04-09 원편광판 및 화상 표시 장치
CN201980033934.6A CN112154359B (zh) 2018-05-22 2019-04-09 圆偏振片以及图像显示装置

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JP2010224378A (ja) * 2009-03-25 2010-10-07 Sumitomo Chemical Co Ltd 粘着剤層付き複合偏光板及び液晶表示装置
JP2011191738A (ja) * 2010-03-16 2011-09-29 Samsung Mobile Display Co Ltd 光学フィルタ及びこれを具備する有機発光装置
JP2017049574A (ja) * 2015-09-01 2017-03-09 日東電工株式会社 光学積層体
WO2018062183A1 (ja) * 2016-09-30 2018-04-05 日東電工株式会社 有機ｅｌ表示装置
WO2019044859A1 (ja) * 2017-08-28 2019-03-07 富士フイルム株式会社 光学異方性膜、円偏光板、表示装置

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JP2013003212A (ja) * 2011-06-13 2013-01-07 Nippon Zeon Co Ltd パターン位相差フィルム、ディスプレイ装置及び立体画像表示システム
JP6010841B2 (ja) * 2012-05-31 2016-10-19 株式会社ポラテクノ 有機ｅｌ表示装置及び有機ｅｌ表示装置用偏光素子
JP2014092611A (ja) * 2012-11-01 2014-05-19 Polatechno Co Ltd 有機ｅｌ表示装置用円偏光板及び有機ｅｌ表示装置
JP6483486B2 (ja) * 2015-03-16 2019-03-13 住友化学株式会社 偏光板及び円偏光板
JP2018072790A (ja) * 2016-11-01 2018-05-10 義久 前田 背景色が暗いモノクロタイプのネガ液晶パネル

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JP2010224378A (ja) * 2009-03-25 2010-10-07 Sumitomo Chemical Co Ltd 粘着剤層付き複合偏光板及び液晶表示装置
JP2011191738A (ja) * 2010-03-16 2011-09-29 Samsung Mobile Display Co Ltd 光学フィルタ及びこれを具備する有機発光装置
JP2017049574A (ja) * 2015-09-01 2017-03-09 日東電工株式会社 光学積層体
WO2018062183A1 (ja) * 2016-09-30 2018-04-05 日東電工株式会社 有機ｅｌ表示装置
WO2019044859A1 (ja) * 2017-08-28 2019-03-07 富士フイルム株式会社 光学異方性膜、円偏光板、表示装置

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SG11202011437PA (en) 2020-12-30
KR20230173215A (ko) 2023-12-26
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