WO2022004284A1 - 位相差層および粘着剤層付偏光板、ならびに、該位相差層および粘着剤層付偏光板を用いた画像表示装置 - Google Patents

位相差層および粘着剤層付偏光板、ならびに、該位相差層および粘着剤層付偏光板を用いた画像表示装置 Download PDF

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WO2022004284A1
WO2022004284A1 PCT/JP2021/021557 JP2021021557W WO2022004284A1 WO 2022004284 A1 WO2022004284 A1 WO 2022004284A1 JP 2021021557 W JP2021021557 W JP 2021021557W WO 2022004284 A1 WO2022004284 A1 WO 2022004284A1
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WIPO (PCT)
Prior art keywords
adhesive layer
pressure
layer
sensitive adhesive
polarizing plate
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PCT/JP2021/021557
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English (en)
French (fr)
Japanese (ja)
Inventor
悟士 山本
智之 木村
昌邦 藤田
雄祐 外山
Original Assignee
日東電工株式会社
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Priority claimed from JP2021085849A external-priority patent/JP2022013705A/ja
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to CN202180042168.7A priority Critical patent/CN115943332A/zh
Priority to KR1020227044879A priority patent/KR20230031220A/ko
Publication of WO2022004284A1 publication Critical patent/WO2022004284A1/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
    • 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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • 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
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light

Definitions

  • the present invention relates to a polarizing plate with a retardation layer and an adhesive layer, and an image display device using the polarizing plate with a retardation layer and an adhesive layer.
  • polarizing plate and a retardation plate are typically used in an image display device.
  • a polarizing plate with a retardation layer in which a polarizing plate and a retardation plate are integrated is widely used (for example, Patent Document 1).
  • the polarizing plate with a retardation layer may cause retardation unevenness in a high temperature environment, and as a result, color unevenness and light leakage may occur in the image display device in a high temperature environment.
  • Re (450) and Re (550) are in-plane phase differences measured with light having wavelengths of 450 nm and 550 nm at 23 ° C., respectively.
  • the Re (550) of the retardation layer is 100 nm to 200 nm, and the angle between the slow axis of the retardation layer and the absorption axis of the polarizing element is 40 ° to 50 ° or 130. ° to 140 °.
  • the retardation layer has a thickness of 15 ⁇ m to 60 ⁇ m.
  • the amount of glue slippage of the first pressure-sensitive adhesive layer after a heating test at 85 ° C. and 500 hours is 250 ⁇ m or less.
  • the retardation layer comprises at least one binding group selected from the group consisting of carbonate bonds and ester bonds, structural units represented by the following general formula (1), and the following general formula (2). ), At least one structural unit selected from the group consisting of structural units represented by), a resin having a positive refractive index anisotropy; an acrylic resin; The amount is 0.5% by mass to 2.0% by mass, the acrylic resin contains 70% by mass or more of structural units derived from methyl methacrylate, and the weight average molecular weight Mw thereof is 10,000 to 200,000.
  • R 1 to R 3 are independently bonded, substituted or unsubstituted alkylene groups having 1 to 4 carbon atoms, and R 4 to R 9 are independent of each other.
  • Substituted alkoxy group with 1-10 carbon atoms substituted or unsubstituted aryloxy group with 1-10 carbon atoms, substituted or unsubstituted amino group, substituted or unsubstituted vinyl group with 1-10 carbon atoms, substituted or unsubstituted. It is an unsubstituted ethynyl group having 1 to 10 carbon atoms, a sulfur atom having a substituent, a silicon atom having a substituent, a halogen atom, a nitro group, or a cyano group; however, R 4 to R 9 are the same as each other.
  • the amount of slippage of the pressure-sensitive adhesive layer between the polarizing element and the retardation layer and the polarizing plate with the retardation layer and the pressure-sensitive adhesive layer are provided.
  • Re (450) is an in-plane phase difference of a film measured with light having a wavelength of 450 nm at 23 ° C.
  • Phase difference in the thickness direction (Rth) is a phase difference in the thickness direction of the film measured with light having a wavelength of ⁇ nm at 23 ° C.
  • Rth (450) is a phase difference in the thickness direction of a film measured with light having a wavelength of 450 nm at 23 ° C.
  • the polarizing plate 10 includes a polarizing element 11, a first protective layer 12 arranged on one side of the polarizing element 11, and a second protective layer 13 arranged on the other side of the polarizing element 11. ..
  • one of the first protective layer 12 and the second protective layer 13 may be omitted.
  • the retardation layer 30 can also function as a protective layer for the polarizing element 11, the second protective layer 13 may be omitted.
  • the angle formed by the slow axis of the retardation layer 30 and the absorption axis of the polarizing element 11 is preferably 40 ° to 50 °, more preferably 42 ° to 48 °, and even more preferably 44 ° to 46 °. It is particularly preferably about 45 °; or preferably 130 ° to 140 °, more preferably 132 ° to 138 °, still more preferably 134 ° to 136 °, and particularly preferably about. It is 135 °.
  • the retarding layer and the polarizing plate with the pressure-sensitive adhesive layer may further have a conductive layer or an isotropic base material with a conductive layer (not shown).
  • a conductive layer or an isotropic substrate with a conductive layer When a conductive layer or an isotropic substrate with a conductive layer is provided, the retardation layer and the polarizing plate with the pressure-sensitive adhesive layer have a touch sensor incorporated between the image display cell (for example, an organic EL cell) and the polarizing plate. It can be applied to a so-called inner touch panel type input display device.
  • the conductive layer or the isotropic base material with the conductive layer is typically provided between the retardation layer 30 and the second pressure-sensitive adhesive layer 40.
  • the other retardation layer and the conductive layer or the isotropic base material with the conductive layer are typically provided in this order from the retardation layer 30 side.
  • stretching typically includes immersing the laminate in an aqueous boric acid solution for stretching. Further, stretching may further comprise, if necessary, stretching the laminate in the air at a high temperature (eg, 95 ° C. or higher) prior to stretching in boric acid aqueous solution.
  • a high temperature eg, 95 ° C. or higher
  • the polymer film can be, for example, an extruded product of the above resin composition.
  • the retardation layer and the polarizing plate with the adhesive layer are typically arranged on the visual recognition side of the image display device as described later, and the first protective layer 12 is typically arranged on the visual recognition side thereof. Therefore, the first protective layer 12 may be subjected to surface treatment such as hard coat treatment, antireflection treatment, anti-sticking treatment, and anti-glare treatment, if necessary. Further / or, if necessary, the first protective layer 12 is provided with a process for improving visibility when visually recognizing through polarized sunglasses (typically, a (elliptical) circularly polarized light function is imparted. (Giving an ultra-high phase difference) may be applied.
  • polarized sunglasses typically, a (elliptical) circularly polarized light function is imparted.
  • the retarding layer and the polarizing plate with the pressure-sensitive adhesive layer can be suitably applied to an image display device that can be used outdoors.
  • the thickness of the retardation layer can be set so that it can function most appropriately as a ⁇ / 4 plate. In other words, the thickness can be set to obtain the desired in-plane phase difference. Specifically, the thickness is preferably 15 ⁇ m to 60 ⁇ m, more preferably 20 ⁇ m to 55 ⁇ m, and most preferably 20 ⁇ m to 50 ⁇ m.
  • oligofluorene structural unit Details of the oligofluorene structural unit are described in, for example, International Publication No. 2015/159928. The publication is incorporated herein by reference.
  • Aromatic bisphenol compounds 2,2-bis (4- (2-hydroxyethoxy) phenyl) propane, 2,2-bis (4- (2-hydroxypropoxy) phenyl) propane, 1,3-bis (2-hydroxy) Dihydroxy compound having an ether group bonded to an aromatic group such as ethoxy) benzene, 4,4'-bis (2-hydroxyethoxy) biphenyl, bis (4- (2-hydroxyethoxy) phenyl) sulfone; terephthalic acid, phthalic acid.
  • the aliphatic dicarboxylic acid and the aromatic dicarboxylic acid component mentioned above can be used as a raw material for the polyester carbonate as the dicarboxylic acid itself, but depending on the production method, a dicarboxylic acid such as a methyl ester or a phenyl ester can be used. Dicarboxylic acid derivatives such as esters and dicarboxylic acid halides can also be used as raw materials.
  • the resin used in the present invention preferably contains a structural unit represented by the following formula (3) as a copolymerization component among the structural units that can be introduced by the compound having an alicyclic structure.
  • Spiroglycol can be used as the dihydroxy compound into which the structural unit of the formula (3) can be introduced.
  • the structural unit represented by the formula (3) is preferably contained in an amount of 5% by mass or more and 90% by mass or less.
  • the upper limit is more preferably 70% by mass or less, and particularly preferably 50% by mass or less.
  • the lower limit is more preferably 10% by mass or more, more preferably 20% by mass or more, and particularly preferably 25% by mass or more.
  • the resin used in the present invention preferably further contains a structural unit represented by the following formula (4) as a copolymerization component.
  • dihydroxy compound into which the structural unit represented by the above formula (4) can be introduced examples include isosorbide (ISB), isomannide, and isoidet, which are in a stereoisomer relationship. These may be used individually by 1 type and may be used in combination of 2 or more type.
  • the structural unit represented by the formula (4) has a characteristic of high water absorption, if the content of the structural unit represented by the formula (4) is not more than the upper limit, the molded product by water absorption The dimensional change can be suppressed to an allowable range.
  • the resin used in the present invention may contain still another structural unit.
  • such a structural unit may be referred to as "another structural unit”.
  • 1,4-cyclohexanedimethanol, tricyclodecanedimethanol, and 1,4-cyclohexanedicarboxylic acid (and its derivatives) are more preferable, and 1,4-cyclohexanedimethanol is more preferable.
  • Methanol and tricyclodecanedimethanol are particularly preferred.
  • a resin containing a structural unit derived from these monomers has an excellent balance of optical properties, heat resistance, mechanical properties, and the like. Further, since the polymerization reactivity of the diester compound is relatively low, it is preferable not to use a diester compound other than the diester compound containing an oligofluorene structural unit from the viewpoint of increasing the reaction efficiency.
  • the glass transition temperature (Tg) of the resin used in the present invention is preferably 110 ° C. or higher and 160 ° C. or lower.
  • the upper limit is more preferably 155 ° C or lower, more preferably 150 ° C or lower, and particularly preferably 145 ° C or lower.
  • the lower limit is more preferably 120 ° C. or higher, and particularly preferably 130 ° C. or higher. If the glass transition temperature is out of the above range, the heat resistance tends to deteriorate, which may cause a dimensional change after film molding or deteriorate the reliability of quality under the usage conditions of the retardation film. On the other hand, if the glass transition temperature is excessively high, unevenness in the film thickness may occur during film molding, the film may become brittle, the stretchability may deteriorate, and the transparency of the film may be impaired.
  • compositions and manufacturing method of the polycarbonate-based resin and the like are described in, for example, International Publication No. 2015/159928 (above). This description is incorporated herein by reference.
  • Acrylic resin an acrylic resin as a thermoplastic resin is used.
  • the monomer as a structural unit of the acrylic resin include the following compounds: methyl methacrylate, methacrylic acid, methyl acrylate, acrylic acid, benzyl (meth) acrylate, n-butyl (meth) acrylate.
  • Cyclododecyl methacrylate cyclododecyl acrylate.
  • These may be used alone or in combination of two or more.
  • Examples of the form in which two or more kinds of monomers are used in combination include copolymerization of two or more kinds of monomers, two or more blends of one kind of monomer homopolymer, and combinations thereof. Further, other monomers copolymerizable with these acrylic monomers (for example, olefin monomers and vinyl monomers) may be used in combination.
  • Acrylic resin contains structural units derived from methyl methacrylate.
  • the content of the structural unit derived from methyl methacrylate in the acrylic resin is preferably 70% by mass or more and 100% by mass or less.
  • the lower limit is more preferably 80% by mass or more, further preferably 90% by mass or more, and particularly preferably 95% by mass or more. Within this range, excellent compatibility with the polycarbonate resin of the present invention can be obtained.
  • As the structural unit other than methyl methacrylate it is preferable to use methyl acrylate, phenyl (meth) acrylate, benzyl (meth) acrylate, and styrene. Thermal stability can be improved by copolymerizing methyl acrylate.
  • the refractive index of the acrylic resin can be adjusted by using phenyl (meth) acrylate, benzyl (meth) acrylate, and styrene
  • the transparent resin composition obtained by adjusting to the refractive index of the combined resin can be adjusted. It is possible to improve the sex.
  • a reverse dispersion retardation film having excellent extensibility and phase difference expression and having a small haze can be obtained.
  • the weight average molecular weight Mw of the acrylic resin is 10,000 or more and 200,000 or less.
  • the lower limit is preferably 30,000 or more, and particularly preferably 50,000 or more.
  • the upper limit is preferably 180,000 or less, and particularly preferably 150,000 or less.
  • the above weight average molecular weight is a polystyrene-equivalent molecular weight measured by GPC.
  • the acrylic resin does not substantially contain a branched structure from the viewpoint of compatibility. The fact that it does not contain a branched structure can be confirmed by the fact that the GPC curve of the acrylic resin is monomodal.
  • twin-screw extruder it is preferable to use a twin-screw extruder in order to obtain the transparency of the resin that can withstand the optical film application. Furthermore, the residual low molecular weight components in the resin and the low molecular weight pyrolysis components during extrusion kneading may contaminate the cooling rolls and transport rolls in the film forming process and the stretching process, so that they can be removed. , It is preferable to use an extruder equipped with a vacuum vent.
  • the resin composition comprises aromatic polycarbonate, aliphatic polycarbonate, aromatic polyester, aliphatic polyester, polyamide, polystyrene, polyolefin, acrylic, amorphous polyolefin, for the purpose of modifying properties such as mechanical properties and / or solvent resistance.
  • Synthetic resins such as ABS, AS, polylactic acid, polybutylene succinate, rubber, and combinations thereof may be further blended.
  • the extrusion molding method particularly the melt extrusion molding method using a T-die, is particularly preferable from the viewpoint of film productivity and ease of subsequent stretching treatment.
  • the molding conditions can be appropriately set according to the composition and type of the resin used, the characteristics desired for the retardation layer, and the like. In this way, a resin film containing a polycarbonate-based resin or the like and an acrylic-based resin can be obtained.
  • a retardation layer having the desired optical characteristics for example, refractive index characteristics, in-plane retardation, Nz coefficient
  • the stretching temperature of the film is a temperature equal to or lower than the glass transition temperature (Tg) of a polycarbonate resin or the like.
  • Tg glass transition temperature
  • the film is in a glass state at a temperature of Tg or less, so that stretching is practically impossible.
  • an acrylic resin typically, polymethylmethacrylate
  • Tg of the polycarbonate resin or the like is not substantially changed. The following can be stretched.
  • the stretching temperature is preferably Tg to Tg-10 ° C, more preferably Tg to Tg-8 ° C, and even more preferably Tg to Tg-5 ° C.
  • the film can be appropriately stretched even at a temperature higher than Tg as long as it is, for example, about Tg + 5 ° C., and for example, about Tg + 2 ° C.
  • the retardation film constituting the retardation layer can be obtained.
  • a commercially available stretched film can be used as the retardation film.
  • a commercially available stretched film may be used as it is, or may be used after secondary processing (for example, stretching treatment, surface treatment) depending on the purpose.
  • Specific examples of commercially available films include the trade name "Pure Ace RM" manufactured by Teijin Limited.
  • the first adhesive layer 20 preferably has a glue slippage amount of 900 ⁇ m or less after a heating test at 85 ° C. and 500 hours. Is 600 ⁇ m or less, more preferably 500 ⁇ m or less, further preferably 400 ⁇ m or less, particularly preferably 300 ⁇ m or less, particularly preferably 250 ⁇ m or less, and most preferably 180 ⁇ m or less.
  • the lower limit of the amount of slippage may be, for example, 20 ⁇ m.
  • the creep value can be measured, for example, by the following procedure: a test sample cut out from an adhesive sheet is attached to a support plate at a 10 mm ⁇ 10 mm joint surface. In an environment of 85 ° C., a load of 500 gf is applied vertically downward with the support plate to which the test sample is attached fixed. The amount of deviation from the support plate after 1 second and 3600 seconds after applying the load is measured and designated as Cr 1 and Cr 3600 , respectively.
  • ⁇ Cr obtained from Cr 1 and Cr 3600 by the following formula be the creep value.
  • the first pressure-sensitive adhesive layer and / or the second pressure-sensitive adhesive layer has a storage elastic modulus at 85 ° C., preferably 1.0 ⁇ 10 4 Pa or more, preferably 2.0 ⁇ 10 4 Pa or more. , More preferably 5.0 ⁇ 10 4 Pa or more, and even more preferably 1.0 ⁇ 10 5 Pa or more.
  • the storage elastic modulus is in such a range, it becomes easy to realize the desired amount of glue slippage and / or creep value.
  • the storage modulus is less for example 3.0 ⁇ 10 6 Pa.
  • the thickness of the first pressure-sensitive adhesive layer is preferably 2 ⁇ m to 50 ⁇ m, and more preferably 3 ⁇ m to 40 ⁇ m.
  • the thickness of the second pressure-sensitive adhesive layer is preferably 4 ⁇ m to 30 ⁇ m, and more preferably 5 ⁇ m to 20 ⁇ m.
  • the first adhesive layer has the desired amount of adhesive slippage
  • the second adhesive layer has a desired amount of adhesive slippage. Any suitable configuration can be employed as long as the pressure-sensitive adhesive layer of the above has the desired creep value.
  • the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer may be composed of the same pressure-sensitive adhesive, or may be composed of different pressure-sensitive adhesives.
  • the constituent materials will be described with the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer collectively as a pressure-sensitive adhesive layer.
  • Composition of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer for example, type of base polymer (polarity, Tg, softness), molecular weight), cross-linking structure (for example, type of cross-linking agent, distance between cross-linking points (molecular weight between cross-linking points), By adjusting the cross-linking density) and the like, the amount of glue slippage and / or the creep value can be controlled.
  • type of base polymer polarity, Tg, softness
  • molecular weight for example, type of cross-linking agent, distance between cross-linking points (molecular weight between cross-linking points)
  • the base polymer pressure-sensitive adhesive layer is typically formed from a pressure-sensitive adhesive composition containing a (meth) acrylic polymer, a urethane-based polymer, a silicone-based polymer or a rubber-based polymer as a base polymer.
  • a (meth) acrylic polymer is used as the base polymer
  • the pressure-sensitive adhesive layer is formed from, for example, a pressure-sensitive adhesive composition containing the (meth) acrylic polymer (A).
  • the (meth) acrylic polymer (A) contains an alkyl (meth) acrylate as a main component.
  • the (meth) acrylic polymer (A) contains an alkyl (meth) acrylate as a main component.
  • the alkyl (meth) acrylate is preferably 50% by weight or more in all the monomer components forming the (meth) acrylic polymer (A) from the viewpoint of improving the adhesiveness of the pressure-sensitive adhesive layer, and the alkyl (meth) acrylate is said.
  • It can be arbitrarily set as the rest of the monomer other than acrylate.
  • (meth) acrylate means acrylate and / or methacrylate.
  • Examples of the alkyl (meth) acrylate constituting the main skeleton of the (meth) acrylic polymer (A) include linear or branched alkyl groups having 1 to 18 carbon atoms.
  • Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, an amyl group, a hexyl group, a cyclohexyl group, a heptyl group, a 2-ethylhexyl group, an isooctyl group, a nonyl group and a decyl group.
  • Alkyl (meth) acrylates can be used alone or in combination.
  • the average carbon number of the alkyl group is preferably 3 to 10.
  • the (meth) acrylic polymer (A) may contain a copolymerized monomer such as a carboxyl group-containing monomer (a1) and a hydroxyl group-containing monomer (a2) as a monomer component in addition to the alkyl (meth) acrylate. good.
  • the copolymerizable monomers can be used alone or in combination.
  • 2-hydroxyethyl (meth) acrylate and 4-hydroxybutyl (meth) acrylate are preferable, and 4-hydroxybutyl (meth) acrylate is more preferable, from the viewpoint of improving the durability of the pressure-sensitive adhesive layer.
  • the content of the hydroxyl group-containing monomer (a2) is usually 0.01% by weight in all the monomer components forming the (meth) acrylic polymer (A). It is 10% by weight or less.
  • the (meth) acrylic polymer (A) preferably contains, as a monomer component, a monomer having an unsaturated carbon double bond in which the glass transition temperature of the homopolymer is 0 ° C. or higher.
  • a monomer having an unsaturated carbon double bond in which the glass transition temperature of the homopolymer is 0 ° C. or higher include an alkyl (meth) acrylate monomer and (meth) acrylic acid.
  • the monomer (a3) is preferably a monomer having an unsaturated carbon double bond having a homopolymer glass transition temperature of 20 ° C. or higher, and has an unsaturated carbon double bond having a homopolymer glass transition temperature of 40 ° C. or higher. Monomers are more preferred.
  • the proportion of the (meth) acrylic polymer (A) containing the monomer (a3) is not particularly limited.
  • the content is usually 0.1% by weight to 40% by weight, more preferably 1% by weight to 30% by weight.
  • the content is the total content when two or more kinds of monomers (a3) are used in combination.
  • Examples of the monomer (a3) include methyl acrylate (Tg: 8 ° C.), methyl methacrylate (Tg: 105 ° C.), ethyl methacrylate (Tg: 65 ° C.), n-propyl acrylate (Tg: 3 ° C.), and n-propyl.
  • the copolymerized monomer becomes a reaction point with the cross-linking agent when the pressure-sensitive adhesive composition contains the cross-linking agent described later.
  • the carboxyl group-containing monomer and the hydroxyl group-containing monomer are highly reactive with the intermolecular cross-linking agent, they are preferably used for improving the cohesiveness and heat resistance of the obtained pressure-sensitive adhesive layer. Further, the carboxyl group-containing monomer is preferable in terms of achieving both durability and reworkability, and the hydroxyl group-containing monomer is preferable in terms of improving the reworkability.
  • Another copolymerization monomer (a4) may be further used as the monomer component.
  • the other copolymerizable monomer (a4) has a polymerizable functional group having an unsaturated double bond such as, for example, a (meth) acryloyl group or a vinyl group.
  • a (meth) acryloyl group or a vinyl group By using the other copolymerization monomer (a4), the adhesiveness and heat resistance of the pressure-sensitive adhesive layer can be improved.
  • the other copolymerization monomer (a4) can be used alone or in combination.
  • Polyfunctional acrylates such as acrylates, tetramethylol methanetri (meth) acrylates, allyl (meth) acrylates, vinyl (meth) acrylates, epoxy acrylates, polyester acrylates, urethane acrylates; and divinylbenzene.
  • the polyfunctional acrylate is preferably 1,6-hexanediol diacrylate or dipentaerythritol hexa (meth) acrylate.
  • the other copolymerization monomer (a4) may be, for example, 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, methoxytriethylene glycol (meth) acrylate, (meth).
  • (Meta) acrylic acid alkoxyalkyl esters such as 3-methoxypropyl acrylate, 3-ethoxypropyl (meth) acrylate, 4-methoxybutyl (meth) acrylate, 4-ethoxybutyl (meth) acrylate; 2-( Cyclic-polymerizable monomer such as methyl acrylate); epoxy group-containing monomer such as (meth) glycidyl acrylate, (meth) methyl glycidyl acrylate; sulfonic acid group-containing monomer such as sodium vinyl sulfonate; phosphoric acid Group-containing monomer; (meth) acrylate having an alicyclic hydrocarbon group such as cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate; phenyl (meth) acrylate, (meth).
  • the pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer and / or the pressure-sensitive adhesive composition constituting the second pressure-sensitive adhesive layer is preferably used as a monomer component of the (meth) acrylic polymer (A) (base polymer). May contain a (meth) acrylic acid ester having an aromatic hydrocarbon group, more preferably benzyl (meth) acrylic acid.
  • the content of the other copolymerization monomer (a4) in the (meth) acrylic polymer is preferably 20% by mass or less, more preferably 10% by mass or less, still more preferably 8% by mass or less, and particularly. It is preferably 5% by mass or less.
  • the weight average molecular weight Mw of the (meth) acrylic polymer (A) is, for example, 200,000 to 3 million, preferably 1 million to 2.5 million, and more preferably 1.2 million to 2.5 million.
  • a pressure-sensitive adhesive layer having excellent durability (particularly heat resistance) can be obtained. If the weight average molecular weight Mw exceeds 3 million, an increase in viscosity and / or gelation during polymer polymerization may occur.
  • the pressure-sensitive adhesive composition can contain a reactive functional group-containing silane coupling agent.
  • the reactive functional group is typically a functional group other than the acid anhydride group.
  • the functional group other than the acid anhydride group include an epoxy group, a mercapto group, an amino group, an isocyanate group, an isocyanurate group, a vinyl group, a styryl group, an acetoacetyl group, a ureido group, a thiourea group and a (meth) acrylic group.
  • Reactive functional group-containing silane coupling agents can be used alone or in combination.
  • the blending amount of the reactive functional group-containing silane coupling agent is usually 100 parts by weight of the (meth) acrylic polymer (A). 0.001 part by weight or more and 5 parts by weight or less.
  • the pressure-sensitive adhesive composition can contain a cross-linking agent.
  • a cross-linking agent an organic cross-linking agent, a polyfunctional metal chelate and the like can be used.
  • the organic cross-linking agent include an isocyanate-based cross-linking agent, a peroxide-based cross-linking agent, an epoxy-based cross-linking agent, and an imine-based cross-linking agent.
  • a polyfunctional metal chelate is one in which a polyvalent metal is covalently or coordinated to an organic compound.
  • a polyfunctional monomer can be used as a cross-linking agent.
  • Crosslinkers can be used alone or in combination.
  • the blending amount of the cross-linking agent in the pressure-sensitive adhesive composition constituting the second pressure-sensitive adhesive layer is at least such a lower limit, a high-temperature environment is obtained due to a synergistic effect with the effect of controlling the amount of glue slippage and the creep value.
  • the retardation unevenness of the retarding layer and the polarizing plate with the adhesive layer underneath can be stably suppressed, and the color unevenness of the image display device in a high temperature environment can be stably suppressed.
  • the pressure-sensitive adhesive composition may contain (meth) acrylic oligomers and / or ionic compounds. Further, the pressure-sensitive adhesive composition may contain an additive. Specific examples of additives include powders such as colorants and pigments, dyes, surfactants, plasticizers, tackifiers, surface lubricants, leveling agents, softeners, antioxidants, antioxidants, and light. Stabilizers, UV absorbers, polymerization inhibitors, inorganic or organic fillers, metal powders, particulates, foils and the like. Further, a redox system to which a reducing agent is added may be adopted within a controllable range.
  • the pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer may contain a polyether compound having a reactive group (for example, a reactive silyl group).
  • a polyether compound having a reactive group for example, a reactive silyl group.
  • the type, number, combination, content, etc. of additives can be appropriately set according to the purpose.
  • the content of the additive is preferably 5 parts by weight or less, more preferably 3 parts by weight or less, and further preferably 1 part by weight or less with respect to 100 parts by weight of the (meth) acrylic polymer (A). be.
  • the polarizing plate with the retardation layer and the pressure-sensitive adhesive layer according to the above items A to E can be applied to an image display device. Therefore, the embodiment of the present invention also includes an image display device using such a retardation layer and a polarizing plate with an adhesive layer.
  • Typical examples of the image display device include a liquid crystal display device and an organic EL display device.
  • the image display device according to the embodiment of the present invention is typically provided with the retardation layer and the polarizing plate with an adhesive layer according to the above items A to E on the visible side thereof.
  • the image display device includes an image display panel.
  • the image display panel includes an image display cell.
  • the image display device may be referred to as an optical display device, the image display panel may be referred to as an optical display panel, and the image display cell may be referred to as an optical display cell.
  • the polarizing plates with the retardation layer and the pressure-sensitive adhesive layer obtained in Examples and Comparative Examples were cut out to a size of 13 inches and used as test samples.
  • the test sample was subjected to a heating test at 85 ° C. and 500 hours, and after the heating test, the amount of protrusion of the first pressure-sensitive adhesive layer protruding from the end faces of the polarizing element and the retardation layer was observed with an objective lens (20 times). It was measured.
  • the length of the portion of the first pressure-sensitive adhesive layer having the largest protrusion was defined as the amount of adhesive slippage.
  • the transmitted light was set to 0 (zero), and adjustment was made so that the light was reflected.
  • ⁇ Cr Cr 3600- Cr 1 (3) Color unevenness
  • the polarizing plate with the retardation layer and the pressure-sensitive adhesive layer obtained in Examples and Comparative Examples was cut out to a size of 13 inches and bonded to a glass plate via a second pressure-sensitive adhesive layer as a test sample.
  • the test sample was subjected to a heating test at 85 ° C. for 500 hours, and after the heating test, it was placed on a reflective sheet (DMS vapor deposition film manufactured by Toray Film Processing Co., Ltd.) and a spectrophotometer (manufactured by Konica Minolta Co., Ltd., product name).
  • the primary sample was then autoclaved at 50 ° C. and 5 atm for 15 minutes (the sample after autoclaving is referred to as the "initial secondary sample”).
  • the initial secondary sample was then subjected to treatment at 85 ° C. for 500 hours (the heated sample is referred to as the "heated secondary sample”).
  • the initial secondary sample and the heated secondary sample were placed on a backlight of 10,000 candelas, light leakage was visually observed, and evaluation was performed according to the following criteria. A: No light leakage occurs.
  • test sample after the durability test was visually observed and evaluated according to the following criteria.
  • (6) Dimensional change rate due to humidification (humidification TMA test) A second retardation film is bonded to the first retardation film obtained in the manufacturing example so as to form a combination of the first retardation layer and the second retardation layer shown in Table 1, and the retardation is obtained. A laminate of films was obtained.
  • the obtained laminate was cut into 20 mm (slow-phase axial direction of the first retardation film) ⁇ 5 mm (phase-advancing axial direction of the first retardation film) to prepare a measurement sample.
  • the second retardation film was not bonded to the first retardation film, and the first retardation film was cut to obtain a measurement sample.
  • the length of the measurement sample was 60 ° C / 85% RH.
  • the dimensional change rate in the direction was measured.
  • the holding time at 25 ° C./50% RH was 30 minutes, the holding time at 50 ° C./60% RH was 60 minutes, and the holding time at 60 ° C./85% RH was 240 minutes.
  • the heating rate between 25 ° C./50% RH and 60 ° C./50% RH was 0.4 ° C./min. The results are shown in Table 1.
  • a long resin film having a thickness of 135 ⁇ m was prepared by using a film forming apparatus equipped with a chill roll (set temperature: 120 to 130 ° C.) and a winder.
  • the obtained long resin film was stretched in the width direction at a stretching temperature of 133 ° C. and a stretching ratio of 2.8 times to obtain a retardation film R1 having a thickness of 48 ⁇ m.
  • the Re (550) of the retardation film R1 was 141 nm, the Re (450) / Re (550) was 0.82, and the Nz coefficient was 1.12.
  • the reduced viscosity of PC1 is 0.46 dL / g, Mw 48,000, refractive index n D is 1.526, a melt viscosity of 2480Pa ⁇ s, a glass transition temperature of 139 ° C., the photoelastic coefficient of 9 ⁇ 10 -12 [ m 2 / N] and the wavelength dispersion Re (450) / Re (550) were 0.85.
  • the pellets of the resin composition thus obtained are vacuum-dried at 100 ° C. for 6 hours or more, and then a single-screw extruder (manufactured by Isuzu Kakohki Co., Ltd., screw diameter 25 mm, cylinder set temperature: 250 ° C.).
  • a single-screw extruder manufactured by Isuzu Kakohki Co., Ltd., screw diameter 25 mm, cylinder set temperature: 250 ° C.
  • a film-forming device equipped with a T-die (width 300 mm, set temperature: 220 ° C), chill roll (set temperature: 120-130 ° C), and a winder, a long length of 3 m in length, 200 mm in width, and 100 ⁇ m in thickness.
  • An unstretched film was produced. This long unstretched film was stretched at a stretching temperature of Tg and a stretching ratio of 2.4 times.
  • the retardation film R2 constituting the retardation layer was obtained.
  • the retardation film R2 exhibited a refractive index characteristic of nx> ny> nz, Re (550) was 145 nm, and Re (450) / Re (550) was 0.85.
  • the prepared liquid crystal coating liquid is applied to the surface of a norbornene-based resin film (manufactured by Zeon Corporation, trade name "Zeonex”), which is a base film, with a bar coater, and then heated at 80 ° C. for 4 minutes. And dried to orient the liquid crystal contained in the coating film.
  • the coating film was cured by irradiation with ultraviolet rays to form a second retardation film, the liquid crystal solidified layer R4 (thickness 0.58 ⁇ m), on the base film.
  • the weight ratio of iodine and potassium iodide was adjusted so that the simple substance transmittance of the obtained polarizing element was 45.0% and the weight ratio was 1: 7. However, it was stretched 1.4 times.
  • the cross-linking treatment adopted a two-step cross-linking treatment, and the first-step cross-linking treatment was carried out 1.2 times while being treated with 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-step crosslinking treatment was 5.0% by weight, and the potassium iodide content was 3.0% by weight.
  • the second-step cross-linking treatment was carried out by stretching 1.6 times while treating with 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 step cross-linking treatment was 4.3% by weight, and the potassium iodide content was 5.0% by weight.
  • the washing treatment was carried out with an aqueous potassium iodide solution at 20 ° C.
  • the potassium iodide content of the aqueous solution of the washing treatment was set to 2.6% by weight.
  • the drying process was carried out at 70 ° C. for 5 minutes to obtain a stator.
  • a triacetyl cellulose film (thickness 40 ⁇ m, manufactured by Konica Minolta, trade name “KC4UYW”) is bonded to one side of the above-mentioned polarizing element via a polyvinyl alcohol-based adhesive, and a polarizing plate having a protective layer / polarizing element configuration is attached. Obtained P1.
  • thermoplastic resin base material an amorphous isophthal copolymerized polyethylene terephthalate film (thickness: 100 ⁇ m) having a long shape and a Tg of about 75 ° C. was used, and one side of the resin base material was subjected to corona treatment.
  • a PVA aqueous solution (coating solution) was prepared by dissolving 13 parts by weight of potassium iodide in water.
  • the PVA aqueous solution was applied to the corona-treated surface of the resin base material and dried at 60 ° C. to form a PVA-based resin layer having a thickness of 13 ⁇ m, and a laminate was prepared.
  • the obtained laminate was uniaxially stretched 2.4 times in the vertical direction (longitudinal direction) in an oven at 130 ° C. (aerial auxiliary stretching treatment). Next, the laminate was immersed in an insolubilizing bath at a liquid temperature of 40 ° C.
  • polarizing plate Preparation of polarizing plate
  • a cycloolefin-based film (ZF-12, 23 ⁇ m, manufactured by Nippon Zeon Corporation) as a protective layer was applied to the surface of the obtained polarizing element (the surface opposite to the resin substrate) via an ultraviolet curable adhesive. I pasted them together.
  • the curable adhesive was coated so as to have a total thickness of about 1.0 ⁇ m, and bonded using a roll machine. Then, a UV ray was irradiated from the cycloolefin film side to cure the adhesive.
  • the resin base material was peeled off to obtain a polarizing plate P2 having a cycloolefin-based film (protective layer) / polarizing element.
  • the prepared adhesive was applied to one side of a polyethylene terephthalate film (separator film, manufactured by Mitsubishi Chemical Polyester Film Co., Ltd., MRF38) treated with a silicone-based release agent so that the thickness of the adhesive layer after drying was 12 ⁇ m. After that, the coating film of the pressure-sensitive adhesive was dried to form a first pressure-sensitive adhesive layer. Further, the second pressure-sensitive adhesive layer was formed in the same manner as the formation of the first pressure-sensitive adhesive layer, except that the pressure-sensitive adhesive layer was applied so as to have a thickness of 15 ⁇ m after drying.
  • Examples 1 to 9 and Comparative Examples 1 to 2 The first pressure-sensitive adhesive layer formed on the surface of the separator film was transferred to a polarizing plate to prepare a polarizing plate with a pressure-sensitive adhesive layer. Further, the second pressure-sensitive adhesive layer formed on the surface of the separator film was transferred to the retardation film to prepare a retardation film with a pressure-sensitive adhesive layer. Then, the polarizing plate with the pressure-sensitive adhesive layer and the retardation film with the pressure-sensitive adhesive layer are used as a polarizing plate, a first retardation film (phase difference layer), a second retardation film (liquid crystal solidifying layer), and a pressure-sensitive adhesive (first).
  • the pressure-sensitive adhesive layer (1) and the pressure-sensitive adhesive layer (2) were combined in the order shown in Table 1 to prepare a retardation layer and a polarizing plate with a pressure-sensitive adhesive layer.
  • the polarizing plate and the first retardation layer are bonded so that the absorption axis of the polarizing element and the slow axis of the retardation film form an angle of 45 °.
  • the obtained retardation layer and the polarizing plate with the pressure-sensitive adhesive layer were subjected to the evaluation of the above-mentioned color unevenness, light leakage and durability. The results are shown in Table 1 together with the amount of glue slippage of the first pressure-sensitive adhesive layer and the creep value of the second pressure-sensitive adhesive layer.
  • the polarizing plate with the retardation layer and the pressure-sensitive adhesive layer of the present invention can be suitably used for an image display device (typically, a liquid crystal display device or an organic EL display device).
  • an image display device typically, a liquid crystal display device or an organic EL display device.

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  • Physics & Mathematics (AREA)
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  • Optics & Photonics (AREA)
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PCT/JP2021/021557 2020-07-01 2021-06-07 位相差層および粘着剤層付偏光板、ならびに、該位相差層および粘着剤層付偏光板を用いた画像表示装置 WO2022004284A1 (ja)

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JP2001272541A (ja) * 2000-03-27 2001-10-05 Nitto Denko Corp 光学補償フィルム付き偏光板及び液晶表示装置
JP2008031212A (ja) * 2006-07-26 2008-02-14 Lintec Corp 光学機能性フィルム貼合用粘着剤、粘着剤付き光学機能性フィルム及びその製造方法
JP2010085802A (ja) * 2008-10-01 2010-04-15 Sony Corp 位相差フィルム・偏光板積層体及び液晶表示装置
JP2013072951A (ja) * 2011-09-27 2013-04-22 Sumitomo Chemical Co Ltd 偏光板およびその製造方法
JP2013101281A (ja) * 2011-11-09 2013-05-23 Keio Gijuku 粘着剤付偏光板、粘着剤付偏光板の設計方法、液晶パネルの製造方法、偏光板の製造方法、及び、粘着剤付偏光板の製造方法
JP2020076968A (ja) * 2018-10-15 2020-05-21 日東電工株式会社 位相差層付偏光板およびそれを用いた画像表示装置

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TW424154B (en) 1998-10-30 2001-03-01 Teijin Ltd Phase film and optical device using same

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JP2001272541A (ja) * 2000-03-27 2001-10-05 Nitto Denko Corp 光学補償フィルム付き偏光板及び液晶表示装置
JP2008031212A (ja) * 2006-07-26 2008-02-14 Lintec Corp 光学機能性フィルム貼合用粘着剤、粘着剤付き光学機能性フィルム及びその製造方法
JP2010085802A (ja) * 2008-10-01 2010-04-15 Sony Corp 位相差フィルム・偏光板積層体及び液晶表示装置
JP2013072951A (ja) * 2011-09-27 2013-04-22 Sumitomo Chemical Co Ltd 偏光板およびその製造方法
JP2013101281A (ja) * 2011-11-09 2013-05-23 Keio Gijuku 粘着剤付偏光板、粘着剤付偏光板の設計方法、液晶パネルの製造方法、偏光板の製造方法、及び、粘着剤付偏光板の製造方法
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