WO2019188743A1 - Plaque de polarisation circulaire - Google Patents

Plaque de polarisation circulaire Download PDF

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Publication number
WO2019188743A1
WO2019188743A1 PCT/JP2019/011968 JP2019011968W WO2019188743A1 WO 2019188743 A1 WO2019188743 A1 WO 2019188743A1 JP 2019011968 W JP2019011968 W JP 2019011968W WO 2019188743 A1 WO2019188743 A1 WO 2019188743A1
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WIPO (PCT)
Prior art keywords
polarizing plate
retardation film
polarizer
circularly polarizing
film
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PCT/JP2019/011968
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English (en)
Japanese (ja)
Inventor
理 小島
清水　享
敏行 飯田
池田　哲朗
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 CN201980022552.3A priority Critical patent/CN111919150B/zh
Priority to KR1020207023371A priority patent/KR102690348B1/ko
Publication of WO2019188743A1 publication Critical patent/WO2019188743A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature

Definitions

  • the present invention relates to a circularly polarizing plate.
  • a circularly polarizing plate having a polarizer and a retardation film functioning as a ⁇ / 4 plate is used for the purpose of preventing reflection of external light or the like.
  • a retardation film using a polycarbonate-based resin has been proposed (Patent Document 1).
  • a retardation film using a polycarbonate-based resin has room for improvement in adhesion with other layers such as a polarizer.
  • Patent Document 2 In order to improve the adhesion of the film, it has been proposed to form an easy-adhesion layer on one surface of the film (Patent Document 2).
  • Patent Document 2 When applied to a retardation film used for a circularly polarizing plate, there is a problem that the antireflection property of the circularly polarizing plate is not sufficiently exhibited by forming an easy adhesion layer.
  • the present invention has been made to solve the above-described conventional problems, and the object of the present invention is to ensure adhesion between the polarizer and the retardation film and to maintain excellent antireflection characteristics. It is to provide a circularly polarizing plate.
  • the circularly polarizing plate of the present invention comprises a polarizer, an easily adhesive layer containing a urethane resin having a carboxyl group and a crosslinking agent, and a retardation film containing a polycarbonate resin and functioning as a ⁇ / 4 plate in this order.
  • the refractive index difference between the retardation film and the easy-adhesion layer is 0.01 or less.
  • the crosslinking agent is a compound having a methylol group or a compound having an oxazoline group.
  • the thickness of the said easily bonding layer is less than 1 micrometer.
  • the retardation film satisfies a relationship of Re (450) ⁇ Re (550).
  • 90 degree adhesive force of the said retardation film and the said easily bonding layer is 1.0 N / 15mm or more. In one embodiment, 90 degree adhesive force of the said polarizer and the said easily bonding layer is 1.0 N / 15mm or more. In one embodiment, the 90 ° adhesive force between the polarizer and the easy-adhesion layer after being placed under 85 ° C. for 500 hours is 1.0 N / 15 mm or more. In one embodiment, the 90 ° adhesive strength between the polarizer and the easy-adhesion layer after being placed under conditions of 60 ° C. and 95% RH for 240 hours is 0.5 N / 15 mm or more.
  • the present invention sufficient adhesion between the polarizer and the retardation film can be secured. Furthermore, even after being subjected to an endurance test, it is possible to prevent the occurrence of problems such as cohesive failure of the undercoat or peeling of the interface and polarization cracks. In addition, the excellent antireflection characteristic of the circularly polarizing plate can be maintained. Furthermore, in the circularly polarizing plate of the present invention, scratches on the surface of the retardation film can be filled with the easy adhesion layer. Therefore, the smoothness of the retardation film surface can also be maintained. Moreover, the circularly-polarizing plate of this invention can exhibit an antireflection characteristic suitably irrespective of the kind of surface treatment.
  • 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.
  • the “refractive index” of a film that causes birefringence after stretching refers to a value calculated by (nx + ny + nz) / 3 unless otherwise specified.
  • Re (550) is the in-plane retardation of the film measured with light having a wavelength of 550 nm at 23 ° C.
  • Re (450) is the in-plane retardation of the film measured with light having a wavelength of 450 nm at 23 ° C.
  • Thickness direction retardation (Rth) “Rth (550)” is a retardation in the thickness direction of the film measured with light having a wavelength of 550 nm at 23 ° C.
  • the circularly polarizing plate of the present invention comprises a polarizer, an easily adhesive layer containing a urethane resin having a carboxyl group and a crosslinking agent, and a retardation film containing a polycarbonate resin and functioning as a ⁇ / 4 plate. Prepare in this order. Practically, an adhesive layer is formed between the easy-adhesion layer and the polarizer. By forming the easy-adhesion layer as described above, the circularly polarizing plate of the present invention can ensure sufficient adhesion between the polarizer and the retardation film containing the polycarbonate resin. Furthermore, sufficient adhesiveness can be ensured even after a durability test with heating and humidification.
  • FIG. 1 is a schematic sectional view of a circularly polarizing plate according to one embodiment of the present invention.
  • the circularly polarizing plate 100 includes a polarizer 10, an adhesive layer 40, an easy-adhesion layer 20, and a retardation film 30 in this order.
  • the polarizer 10 and the retardation film 30 are laminated via an adhesive layer 40. That is, in the illustrated example, the polarizer 10 and the retardation film 30 are directly laminated (without interposing another optical functional layer).
  • the circularly polarizing plate 100 may have a protective film (not shown) laminated on the side of the polarizer 10 opposite to the retardation film 30.
  • the refractive index difference between the retardation film and the easy adhesion layer is 0.01 or less, preferably 0.005 or less.
  • the refractive index difference between the retardation film and easy adhesion is 0.01 or less, the excellent antireflection property of the circularly polarizing plate can be maintained.
  • the difference in refractive index between the retardation film and the easy-adhesion layer is particularly 0 (the refractive index of the retardation film and the easy-adhesion layer is the same). preferable.
  • the 90 ° adhesive force between the retardation film and the easy-adhesion layer is preferably 1.0 N / 15 mm or more, more preferably 2.0 N / 15 mm or more.
  • the 90 ° adhesive strength between the polarizer and the easy-adhesion layer is preferably 1.0 N / 15 mm or more, and more preferably 2.0 N / 15 mm or more.
  • the 90 ° adhesive strength between the polarizer and the easy-adhesion layer after being placed under 85 ° C. conditions (hereinafter also referred to as heating conditions) for 500 hours is preferably 1.0 N / 15 mm. It is above, More preferably, it is 2.0 N / 15mm or more. Further, the 90 ° adhesive strength between the polarizer and the easy-adhesion layer after being placed under the conditions of 60 ° C. and 95% RH (hereinafter also referred to as heating and humidifying conditions) for 240 hours is preferably 0.5 N / 15 mm or more. Yes, more preferably 1.0 N / 15 mm or more. Adequate adhesion can be ensured even after the endurance test because the 90 ° adhesive strength after heating and humidifying conditions is in the above range.
  • 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 substrate / polarizer laminate may be used as it is (that is, the resin substrate may be used as an inner protective layer provided between the retardation film and the polarizer).
  • the resin base material may be peeled from the laminated body of the child, and any appropriate protective layer depending on the purpose may be laminated on the peeled surface as the inner protective layer. 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 can be appropriately designed according to the purpose and application, and is preferably 3 ⁇ m to 25 ⁇ m.
  • the polarizer preferably exhibits absorption dichroism at any wavelength between 380 nm and 780 nm.
  • the single transmittance of the polarizer is preferably 42.0% to 46.0%, more preferably 43.0% 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 easy adhesive layer 20 includes a urethane resin having a carboxyl group and a crosslinking agent.
  • the easy adhesion layer is formed on one surface of the retardation film.
  • a circularly polarizing plate can be obtained by forming an adhesive layer on the surface of the retardation film on which the easy-adhesion layer is formed and attaching the adhesive layer to a polarizer.
  • the urethane resin having a carboxyl group and the crosslinking agent in the easy adhesion layer, the adhesion between the polarizer and the retardation film containing the polycarbonate resin is improved.
  • the circularly polarizing plate is subjected to an endurance test, this adhesion can be maintained.
  • the refractive index difference of the said retardation film and an easily bonding layer is 0.01 or less. Therefore, the excellent antireflection characteristic of the obtained circularly polarizing plate can be maintained.
  • Urethane resin having a carboxyl group The urethane resin has a carboxyl group. By having a carboxyl group, it is possible to provide a circularly polarizing plate having excellent adhesion (particularly at high temperatures) between the polarizer and the retardation film.
  • the urethane-based resin is typically obtained by reacting a polyol and a polyisocyanate.
  • the polyol is not particularly limited as long as it has two or more hydroxyl groups in the molecule, and any suitable polyol can be adopted. For example, polyacryl polyol, polyester polyol, polyether polyol and the like can be mentioned. These may be used alone or in combination of two or more.
  • the urethane resin having a carboxyl group can be obtained, for example, by reacting a chain extender having a free carboxyl group in addition to the polyol and the polyisocyanate.
  • chain extender having a free carboxyl group include dihydroxycarboxylic acid and dihydroxysuccinic acid.
  • dihydroxycarboxylic acid include dialkylolalkanoic acids such as dimethylolalkanoic acid (for example, dimethylolacetic acid, dimethylolbutanoic acid, dimethylolpropionic acid, dimethylolbutyric acid, dimethylolpentanoic acid). These may be used alone or in combination of two or more.
  • polystyrene resin in addition to the above components, other polyols and other chain extenders may be reacted.
  • other polyols include sorbitol, 1,2,3,6-hexanetetraol, 1,4-sorbitan, 1,2,4-butanetriol, 1,2,5-pentanetriol, glycerin, and trimethylol.
  • polyols having 3 or more hydroxyl groups such as ethane, trimethylolpropane and pentaerythritol.
  • chain extenders examples include ethylene glycol, diethylene glycol, triethylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, pentanediol, 1,6 -Glycols such as hexanediol and propylene glycol; aliphatic diamines such as ethylenediamine, propylenediamine, hexamethylenediamine, 1,4-butanediamine and aminoethylethanolamine; isophoronediamine, 4,4'-dicyclohexylmethanediamine and the like Alicyclic diamines; and aromatic diamines such as xylylenediamine and tolylenediamine.
  • Crosslinking agent Any appropriate crosslinking agent can be used as the crosslinking agent.
  • a crosslinking agent capable of reacting with a carboxyl group and a crosslinking agent capable of reacting with a polyvinyl alcohol resin are used.
  • the crosslinking agent capable of reacting with a carboxyl group include a polymer having a group capable of reacting with a carboxyl group.
  • the group that can react with a carboxyl group include an organic amino group, an oxazoline group, an epoxy group, a carbodiimide group, an aldehyde group, and a methylol group.
  • the cross-linking agent is preferably a polymer having an oxazoline group.
  • a polymer having an oxazoline group has a long pot life at room temperature when mixed with the urethane resin, and has a good workability because a crosslinking reaction proceeds by heating.
  • any appropriate polymer can be adopted as the polymer.
  • examples thereof include acrylic polymers and styrene / acrylic polymers.
  • An acrylic polymer is preferable. By using the acrylic polymer, the adhesion between the polarizer and the retardation film can be further improved.
  • the crosslinking agent capable of reacting with the polyvinyl alcohol resin is preferably a compound having at least two functional groups having reactivity with the polyvinyl alcohol resin.
  • the cross-linking agent capable of reacting with the PVA resin is preferably an amino-formaldehyde resin or a dialdehyde.
  • the amino-formaldehyde resin is preferably a compound having a methylol group, and the dialdehyde is preferably glyoxal.
  • a compound having a methylol group is preferred, and methylol melamine is more preferred.
  • the easy-adhesion layer is typically formed by applying an easy-adhesion layer-forming composition containing a urethane-based resin having a carboxyl group and a crosslinking agent to a retardation film.
  • Content of the crosslinking agent of an easily bonding layer forming composition can be set to arbitrary appropriate values.
  • the content of the crosslinking agent is preferably 1 part by weight to 20 parts by weight, more preferably 5 parts by weight to 15 parts by weight with respect to 100 parts by weight of the urethane resin having a carboxyl group.
  • the easy-adhesion layer-forming composition may further contain any appropriate additive.
  • additives include anti-blocking agents, dispersion stabilizers, thixotropic agents, antioxidants, ultraviolet absorbers, antifoaming agents, thickeners, dispersants, surfactants, catalysts, fillers, lubricants, and antistatic agents. Agents and the like.
  • the easy-adhesion layer 20 is typically formed by applying an easy-adhesion layer forming composition to one surface of the retardation film 30 and drying it.
  • the retardation film is a stretched film, it may be stretched after forming an easy-adhesion layer on an unstretched polycarbonate-based resin film, or an easy-adhesion layer may be formed on the stretched polycarbonate-based resin film.
  • Arbitrary appropriate methods can be employ
  • Examples thereof include a die coating method, a bar coating method, a roll coating method, a gravure coating method, a rod coating method, a slot orifice coating method, a curtain coating method, and a fountain coating method.
  • the drying temperature is typically 50 ° C. or higher, preferably 70 ° C. or higher, more preferably 90 ° C. or higher. By setting the drying temperature in such a range, it is possible to provide a circularly polarizing plate having excellent color resistance (particularly under high temperature and high humidity).
  • the drying temperature is preferably 120 ° C. or lower, more preferably 100 ° C. or lower.
  • the thickness of the easy-adhesion layer 20 can be set to any appropriate value.
  • the thickness of the easy adhesion layer 20 is preferably less than 1 ⁇ m, more preferably 50 nm to 500 nm, still more preferably 200 nm to 400 nm. By setting to such a range, the adhesion between the polarizer and the retardation film can be ensured. Furthermore, when there is a scratch on the surface of the retardation film, the effect of filling the scratch can be exhibited.
  • the retardation film 30 contains a polycarbonate-based resin and functions as a ⁇ / 4 plate.
  • a retardation film containing a polycarbonate-based resin has a problem that sufficient adhesion between the polarizer and the retardation film cannot be obtained.
  • the above-mentioned easy-adhesion layer is formed on one surface of the retardation film, and a polarizer is laminated on the surface on which the easy-adhesion layer is formed via an adhesive layer. And the retardation film can be secured.
  • the retardation film 30 typically has a slow axis.
  • the angle ⁇ formed by the slow axis of the retardation film 30 and the absorption axis of the polarizer 10 is preferably 38 ° to 52 °, more preferably 42 ° to 48 °. More preferably, it is about 45 °.
  • the angle ⁇ is in such a range, a circularly polarizing plate having very excellent circular polarization characteristics can be obtained.
  • the retardation film preferably has a refractive index characteristic of nx> ny ⁇ nz.
  • the retardation film is typically provided for imparting antireflection characteristics to the circularly polarizing plate.
  • the in-plane retardation Re (550) of the retardation film is preferably 80 nm to 200 nm, more preferably 100 nm to 180 nm, and further preferably 110 nm to 170 nm.
  • the birefringence ⁇ n xy of the retardation film is, for example, 0.0025 or more, and preferably 0.0028 or more.
  • the upper limit of the birefringence ⁇ n xy is, for example, 0.0060, and preferably 0.0050.
  • the Nz coefficient of the retardation film is preferably 0.9 to 3, more preferably 0.9 to 2.5, still more preferably 0.9 to 1.5, and particularly preferably 0.9 to 1.3. .
  • the retardation film may exhibit a reverse chromatic dispersion characteristic in which the retardation value increases with the wavelength of the measurement light, or may exhibit a positive chromatic dispersion characteristic in which the retardation value decreases with the wavelength of the measurement light.
  • the phase difference value may exhibit a flat chromatic dispersion characteristic that hardly changes depending on the wavelength of the measurement light.
  • the retardation film preferably exhibits reverse wavelength dispersion characteristics. In one embodiment, the retardation film exhibits reverse wavelength dispersion characteristics. In this case, the retardation film satisfies the relationship of Re (450) ⁇ Re (550), and Re (450) / Re (550) of the retardation film is preferably 0.8 or more and less than 1, more preferably 0.8 or more and 0.95 or less.
  • the retardation film exhibits flat wavelength dispersion characteristics.
  • Re (450) / Re (550) of the retardation film is preferably 0.99 to 1.03, and Re (650) / Re (550) is preferably 0.98 to 1.02.
  • the retardation film may have a laminated structure. Specifically, the retardation film functioning as a ⁇ / 2 plate and the retardation film functioning as a ⁇ / 4 plate are arranged at a predetermined axial angle (for example, 50 ° to 70 °, preferably about 60 °).
  • the retardation film preferably has a water absorption of 3% or less, more preferably 2.5% or less, and further preferably 2% or less.
  • a water absorption rate can be calculated
  • the retardation film preferably has an absolute value of the photoelastic coefficient of 40 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less, more preferably 35 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less.
  • the photoelastic coefficient is in such a range, non-uniformity of the phase difference due to heat can be prevented.
  • the thickness of the retardation film is, for example, 70 ⁇ m or less, and preferably 30 ⁇ m to 60 ⁇ m. With such a thickness, appropriate mechanical strength can be imparted also as a protective layer for the polarizer.
  • the retardation film contains a polycarbonate resin.
  • Any appropriate polycarbonate resin can be used as the polycarbonate resin.
  • the polycarbonate-based resin includes a structural unit derived from a fluorene-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, an alicyclic diol, an alicyclic dimethanol, di, tri, or polyethylene glycol, and And a structural unit derived from at least one dihydroxy compound selected from the group consisting of alkylene glycol or spiroglycol.
  • the polycarbonate-based resin is a structural unit derived from a fluorene-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, a structural unit derived from an alicyclic dimethanol, and / or di, tri, or polyethylene glycol.
  • the polycarbonate resin may contain structural units derived from other dihydroxy compounds as necessary. Details of the polycarbonate-based resin that can be suitably used in the present invention are described in, for example, Japanese Patent Application Laid-Open Nos. 2014-10291 and 2014-26266, and the description is incorporated herein by reference. Is done.
  • a polycarbonate resin containing a unit structure derived from a dihydroxy compound represented by the following general formula (1) may be used.
  • R 1 to R 4 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, or a substituted or unsubstituted cycloalkyl group having 6 to 20 carbon atoms.
  • a substituted or unsubstituted aryl group having 6 to 20 carbon atoms wherein X is a substituted or unsubstituted alkylene group having 2 to 10 carbon atoms, a substituted or unsubstituted cycloalkylene group having 6 to 20 carbon atoms, Alternatively, it represents a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, and m and n are each independently an integer of 0 to 5.
  • dihydroxy compound represented by the general formula (1) examples include 9,9-bis (4-hydroxyphenyl) fluorene, 9,9-bis (4-hydroxy-3-methylphenyl) fluorene, -Bis (4-hydroxy-3-ethylphenyl) fluorene, 9,9-bis (4-hydroxy-3-n-propylphenyl) fluorene, 9,9-bis (4-hydroxy-3-isopropylphenyl) fluorene, 9,9-bis (4-hydroxy-3-n-butylphenyl) fluorene, 9,9-bis (4-hydroxy-3-sec-butylphenyl) fluorene, 9,9-bis (4-hydroxy-3- tert-butylphenyl) fluorene, 9,9-bis (4-hydroxy-3-cyclohexylphenyl) fluorene, 9,9-bis (4-bis (4- Droxy-3-phenylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) phenyl) fluor
  • the polycarbonate resin includes isosorbide, isomannide, isoidet, spiroglycol, dioxane glycol, diethylene glycol (DEG), triethylene glycol (TEG), polyethylene glycol (PEG), and bisphenols.
  • a structural unit derived from a dihydroxy compound such as
  • a polycarbonate-based resin containing an oligofluorene structural unit can be used.
  • the polycarbonate-based resin containing an oligofluorene structural unit include a resin containing a structural unit represented by the following general formula (2) and / or a structural unit represented by the following general formula (3).
  • R 5 and R 6 are each independently a direct bond, a substituted or unsubstituted alkylene group having 1 to 4 carbon atoms (preferably on the main chain).
  • R 7 is a direct bond, a substituted or unsubstituted alkylene group having 1 to 4 carbon atoms (preferably having 1 to 2 carbon atoms on the main chain).
  • R 8 to R 13 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms (preferably 1 to 4, more preferably 1 to 2), substituted or unsubstituted A substituted aryl group having 4 to 10 carbon atoms (preferably 4 to 8, more preferably 4 to 7), a substituted or unsubstituted carbon group having 1 to 10 carbon atoms (preferably 1 to 4, more preferably 1 to 2) Acyl group, substituted or unsubstituted, 1 to 0 (preferably 1 to 4, more preferably 1 to 2) alkoxy group, substituted or unsubstituted aryloxy group having 1 to 10 carbon atoms (preferably 1 to 4, more preferably 1 to 2), substituted or unsubstituted An unsubstituted acyloxy group having 1 to 10 carbon atoms (preferably 1 to 4, more preferably 1 to 2), a substituted or unsubstituted amino group, and a substituted or unsubstituted carbon
  • the fluorene ring contained in the oligofluorene structural unit has a configuration in which all of R 8 to R 13 are hydrogen atoms, or R 8 and / or R 13 is a halogen atom or an acyl group. , A nitro group, a cyano group, and a sulfo group, and R 9 to R 12 are hydrogen atoms.
  • the glass transition temperature of the polycarbonate resin is preferably 110 ° C. or higher and 150 ° C. or lower, more preferably 120 ° C. or higher and 140 ° C. or lower. If the glass transition temperature is excessively low, the heat resistance tends to deteriorate, there is a possibility of causing a dimensional change after film formation, and the image quality of the obtained image display device may be lowered. If the glass transition temperature is excessively high, the molding stability at the time of film molding may deteriorate, and the transparency of the film may be impaired.
  • the glass transition temperature is determined according to JIS K 7121 (1987).
  • the molecular weight of the polycarbonate resin can be represented by a reduced viscosity.
  • the reduced viscosity is measured using a Ubbelohde viscometer at a temperature of 20.0 ° C. ⁇ 0.1 ° C., using methylene chloride as a solvent, precisely adjusting the polycarbonate concentration to 0.6 g / dL.
  • the lower limit of the reduced viscosity is usually preferably 0.30 dL / g, more preferably 0.35 dL / g or more.
  • the upper limit of the reduced viscosity is usually preferably 1.20 dL / g, more preferably 1.00 dL / g, still more preferably 0.80 dL / g.
  • the reduced viscosity is smaller than the lower limit, there may be a problem that the mechanical strength of the molded product is reduced. On the other hand, if the reduced viscosity is larger than the above upper limit value, the fluidity at the time of molding is lowered, and there may be a problem that productivity and moldability are lowered.
  • the retardation film is obtained, for example, by stretching a film formed from the polycarbonate resin.
  • Any appropriate molding method can be adopted as a method of forming a film from a polycarbonate-based resin. Specific examples include compression molding methods, transfer molding methods, injection molding methods, extrusion molding methods, blow molding methods, powder molding methods, FRP molding methods, cast coating methods (for example, casting methods), calendar molding methods, and hot presses. Law. Extrusion molding or cast coating is preferred. This is because the smoothness of the resulting film can be improved and good optical uniformity can be obtained.
  • the molding conditions can be appropriately set according to the composition and type of the resin used, the properties desired for the retardation film, and the like. In addition, as above-mentioned, since many film products are marketed for polycarbonate-type resin, you may use the said commercial film as it is for a extending
  • the thickness of the resin film can be set to any appropriate value depending on the desired thickness of the retardation film, the desired optical properties, the stretching conditions described below, and the like.
  • the thickness is preferably 50 ⁇ m to 300 ⁇ m.
  • Any appropriate stretching method and stretching conditions may be employed for the stretching.
  • various stretching methods such as free end stretching, fixed end stretching, free end contraction, and fixed end contraction can be used singly or simultaneously or sequentially.
  • the stretching direction can also be performed in various directions and dimensions such as a length direction, a width direction, a thickness direction, and an oblique direction.
  • the stretching temperature is preferably Tg-30 ° C. to Tg + 60 ° C., more preferably Tg-10 ° C. to Tg + 50 ° C. with respect to the glass transition temperature (Tg) of the resin film.
  • a retardation film having the desired optical characteristics (for example, refractive index characteristics, in-plane retardation, Nz coefficient) can be obtained by appropriately selecting the stretching method and stretching conditions.
  • 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 can be produced by continuously stretching a long resin film obliquely in the direction of the angle ⁇ described above with respect to the longitudinal direction.
  • a long stretched film having an orientation angle of ⁇ with respect to the longitudinal direction of the film (slow axis in the direction of angle ⁇ ) can be obtained.
  • the angle ⁇ may be an angle formed by the absorption axis of the polarizer and the slow axis of the retardation film in the circularly polarizing plate.
  • the angle ⁇ is preferably 38 ° to 52 °, more preferably 42 ° to 48 °, and further preferably about 45 °.
  • the polarizer and the retardation film are bonded together via an adhesive layer formed on the easy-adhesion layer.
  • the adhesive layer can be composed of any suitable adhesive.
  • the thickness of the adhesive layer is preferably 20 nm to 1000 nm, more preferably 100 nm to 700 nm.
  • the refractive index difference between the adhesive layer and the retardation film is preferably 0.01 or less, more preferably 0.005 or less.
  • the excellent antireflection characteristic of the circularly polarizing plate can be more maintained.
  • the adhesive preferably has transparency and optical isotropy. Any appropriate adhesive can be adopted as the adhesive. Specific examples include water-based adhesives, solvent-based adhesives, emulsion-based adhesives, solventless adhesives, active energy ray-curable adhesives, and thermosetting adhesives. Examples of the active energy ray curable adhesive include an electron beam curable adhesive, an ultraviolet curable adhesive, and a visible light curable adhesive. Preferably, a thermosetting adhesive or a UV curable adhesive containing a PVA resin is used.
  • thermosetting adhesive containing the PVA resin examples include a PVA resin and an acetoacetyl group-containing PVA resin.
  • a PVA resin and an acetoacetyl group-containing PVA resin Preferably, it is an acetoacetyl group-containing PVA resin. This is because the adhesion between the polarizer and the protective film can be further improved and the durability can be improved.
  • the acetoacetyl group-containing PVA resin can be obtained, for example, by reacting a PVA resin and diketene by an arbitrary method.
  • a method of adding diketene to a dispersion in which a PVA resin is dispersed in a solvent such as acetic acid a method of adding diketene to a solution obtained by dissolving a PVA resin in a solvent such as dimethylformamide or dioxane
  • a diketene gas or liquid diketene is brought into direct contact with the PVA resin.
  • the thermosetting adhesive containing the PVA resin may contain a crosslinking agent.
  • Arbitrary appropriate crosslinking agents can be employ
  • a compound having at least two functional groups having reactivity with the PVA-based resin is preferable.
  • those mentioned as the crosslinking agent for the easy-adhesion layer can be used.
  • the blending amount of the crosslinking agent can be appropriately set according to the type of the PVA resin. Typically, it is about 10 to 60 parts by weight, preferably 20 to 50 parts by weight, based on 100 parts by weight of the PVA resin. This is because the adhesiveness can be excellent.
  • reaction of a crosslinking agent advances in a short time, and there exists a tendency for an adhesive agent to gelatinize. As a result, the usable time (pot life) as an adhesive becomes extremely short, and industrial use may be difficult.
  • the thermosetting adhesive containing the PVA resin can contain a metal compound colloid.
  • the metal compound colloid can be one in which metal compound fine particles are dispersed in a dispersion medium, and can be electrostatically stabilized due to mutual repulsion of the same kind of charge of the fine particles, and can have permanent stability. .
  • an adhesive composition having excellent stability can be obtained even when the amount of the crosslinking agent is large.
  • the average particle diameter of the fine particles forming the metal compound colloid can be any appropriate value as long as it does not adversely affect the optical characteristics such as polarization characteristics.
  • the thickness is preferably 1 nm to 100 nm, more preferably 1 nm to 50 nm. This is because the fine particles can be uniformly dispersed in the adhesive layer, the adhesion can be ensured, and the occurrence of knick defects can be suppressed. “Knick defect” means light leakage.
  • metal compound any appropriate compound can be adopted as the metal compound.
  • metal oxides such as alumina, silica, zirconia and titania
  • metal salts such as aluminum silicate, calcium carbonate, magnesium silicate, zinc carbonate, barium carbonate and calcium phosphate
  • minerals such as celite, talc, clay and kaolin It is done.
  • a metal compound colloid having a positive charge is preferably used in the present invention.
  • the metal compound include alumina and titania, and alumina is particularly preferable.
  • the metal compound colloid is typically present in the state of a colloid solution dispersed in a dispersion medium.
  • the dispersion medium include water and alcohols.
  • the solid concentration in the colloidal solution is typically about 1% to 50% by weight, and preferably 1% to 30% by weight.
  • the colloidal solution can contain acids such as nitric acid, hydrochloric acid, acetic acid as stabilizers.
  • the amount of the metal compound colloid (solid content) is preferably 200 parts by weight or less, more preferably 10 parts by weight to 200 parts by weight, and even more preferably 20 parts by weight to 100 parts by weight of the polyvinyl alcohol resin.
  • the amount is 175 parts by weight, particularly preferably 30 parts by weight to 150 parts by weight. This is because the occurrence of knick defects can be suppressed while ensuring the adhesiveness.
  • the ultraviolet curable adhesive examples include a (meth) acrylate adhesive.
  • (Meth) acrylate means acrylate and / or methacrylate.
  • the curable component in the (meth) acrylate adhesive examples include a compound having a (meth) acryloyl group and a compound having a vinyl group.
  • Preferred examples of the compound having a (meth) acryloyl group include N-substituted amide monomers represented by the following formula (4).
  • R 14 represents a hydrogen atom or a methyl group
  • X represents a —CH 2 — group or a —CH 2 CH 2 — group
  • R 15 represents a — (CH 2 ) n—H group (where n is 0 , 1 or 2)
  • m represents 1 or 2.
  • the (meth) acrylate-based adhesive may further contain a monomer having two or more carbon-carbon double bonds, preferably a polyfunctional (meth) acrylate-based monomer, as a curable component. More preferably, the monomer having two or more carbon-carbon double bonds is hydrophobic.
  • the (meth) acrylate-based adhesive may contain monofunctional (meth) acrylates having various aromatic rings and hydroxy groups, urethane (meth) acrylates, polyester (meth) acrylates, and the like as curable components. .
  • the (meth) acrylate adhesive may contain any appropriate copolymer component.
  • the ultraviolet curable adhesive further contains a polymerization initiator.
  • the content of the polymerization initiator is preferably 0.01 to 10 parts by weight, and more preferably 0.05 to 5 parts by weight with respect to the total amount of the ultraviolet curable adhesive.
  • the amount is particularly preferably 0.1 to 3 parts by weight.
  • the ultraviolet curable adhesive can be blended with various additives as other optional components as long as the objects and effects of the present invention are not impaired.
  • additives include various polymers or oligomers; polymerization inhibitors; polymerization initiation assistants; leveling agents; wettability improvers; surfactants; plasticizers; ultraviolet absorbers; silane coupling agents; And dyes.
  • the active energy ray-curable adhesive is a photocationic curable adhesive mainly composed of an epoxy compound and a photoacid generator.
  • the epoxy compound that can be used include compounds described in JP-A 2010-145537, [0031]-[0085].
  • the photoacid generator include compounds described in JP-A-2009-013316, [0080]-[0095]. The descriptions in these publications are incorporated herein by reference.
  • the circularly-polarizing plate of this invention is further equipped with arbitrary appropriate layers other than the said polarizer, an easily bonding layer, and retardation film.
  • a protective film is mentioned.
  • the protective film is formed of any appropriate film that can be used as a protective film for a polarizer.
  • Specific examples of the material as the main component of the 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.
  • TAC triacetyl cellulose
  • 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 circularly polarizing plate of the present invention is typically disposed on the viewing side of the display device, and the protective film is typically disposed on the viewing side. Therefore, the protective film may be subjected to surface treatment such as hard coat treatment, antireflection treatment, antisticking treatment, and antiglare treatment as necessary.
  • the thickness of the protective film is, for example, 10 ⁇ m to 100 ⁇ m, preferably 30 ⁇ m to 90 ⁇ m.
  • the thickness of the protective film is a thickness including the thickness of the surface treatment layer.
  • the circularly polarizing plate of the present invention can be applied to any appropriate use. Specifically, it can be applied to display devices such as liquid crystal display devices and organic EL display devices.
  • the display device includes, for example, a display element and the circularly polarizing plate disposed on the viewing side of the display element.
  • the circularly polarizing plate is arranged so that the retardation layer is on the display element side.
  • the circularly polarizing plate was bonded to a glass plate.
  • a and Day Co., Ltd. Tensilon Universal Testing Machine RTC was used to peel the retardation film and the polarizer in the 90 ° direction at a peeling rate of 1000 mm / min, and the peel strength was measured to obtain 90 ° adhesive strength. .
  • (4) Reflectivity of circularly polarizing plate An adhesive (manufactured by Nitto Denko Corporation, trade name: No. 7) was applied on the reflector so that the thickness after drying was 15 ⁇ m, and obtained in Examples and Comparative Examples. The obtained circularly polarizing plate retardation film and a reflecting plate were bonded together.
  • a polarizing plate manufactured by Nitto Denko Corporation, trade name “REGQS1298DUHC3” was bonded onto the retardation plate so that the angle formed by the slow axis of the retardation plate and the absorption axis of the polarizing plate was 45 °.
  • the reflectance was measured using a spectrocolorimeter “CM-2600d” manufactured by Konica Minolta (SCI value).
  • CM-2600d manufactured by Konica Minolta
  • the inside of the reaction apparatus was purged with nitrogen under reduced pressure.
  • the raw materials were dissolved while stirring at 150 ° C. for about 10 minutes.
  • the temperature was raised to 220 ° C. over 30 minutes, and the reaction was performed at normal pressure for 60 minutes.
  • the pressure was reduced from normal pressure to 13.3 kPa over 90 minutes, held at 13.3 kPa for 30 minutes, and the generated phenol was extracted out of the reaction system.
  • the temperature of the heating medium was raised to 240 ° C. over 15 minutes, the pressure was reduced to 0.10 kPa or less over 15 minutes, and the generated phenol was extracted out of the reaction system.
  • the reaction was stopped by restoring the pressure to normal pressure with nitrogen, the produced polyester carbonate was extruded into water, and the strand was cut to obtain polycarbonate resin pellets. Subsequently, the film was produced from the obtained polycarbonate-type resin pellet.
  • the obtained film (unstretched) had a refractive index of 1.53.
  • the film was stretched obliquely to form a retardation film (thickness: 57 ⁇ m, photoelastic coefficient: 16 ⁇ 10 ⁇ 12 Pa ⁇ 1 , Re (450): 120 nm, Re (550): 140 nm, Re (450) / Re ( 550): 0.86) was obtained.
  • the stretching direction was 45 ° with respect to the longitudinal direction of the film. Further, the stretch ratio was adjusted to 2 to 3 so that the obtained retardation film exhibited a retardation of ⁇ / 4.
  • the stretching temperature was 148 ° C. (that is, Tg + 5 ° C. of unstretched modified polycarbonate film).
  • 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 reaction was terminated, and the produced reaction product was extruded into water to obtain polycarbonate copolymer pellets.
  • the obtained pellets were converted into a single-screw extruder (made by Isuzu Chemical Industries Ltd., screw diameter 25 mm, cylinder set temperature: 220 ° C.), T-die (width 200 mm, set temperature: 220 ° C.), chill roll (set temperature: 120 to And a film forming apparatus equipped with a winder was used to obtain a film having a thickness of 100 ⁇ m.
  • the obtained film (unstretched) had a refractive index of 1.51.
  • the obtained film was obliquely stretched to form a retardation film 2 (thickness: 30 ⁇ m, photoelastic coefficient: 30 ⁇ 10 ⁇ 12 Pa ⁇ 1 , Re (450): 140 nm, Re (550): 140 nm, Re (450) / Re (550): 1.0) was obtained.
  • the stretching direction was 45 ° with respect to the longitudinal direction of the film.
  • the stretch ratio was adjusted to 2 to 3 so that the obtained retardation film exhibited a retardation of ⁇ / 4.
  • Dyeing bath 30 degree aqueous solution containing 0.035 parts by weight of iodine with respect to 100 parts by weight of water and 0.2 parts by weight of potassium iodide with respect to 100 parts by weight of water.
  • First cross-linking bath 40 ° C. aqueous solution containing 3% by weight potassium iodide and 3% by weight boric acid.
  • Second crosslinking bath 60 ° C. aqueous solution containing 5% by weight potassium iodide and 4% by weight boric acid.
  • Washing bath 25 degree aqueous solution containing 2.6% by weight of potassium iodide.
  • Example 1 (Preparation of easy adhesion layer forming composition 1) An easy-adhesion layer is formed by adding and mixing 5 parts by weight of a crosslinking agent (trade name: Watersol S695, manufactured by DIC) to 100 parts by weight of urethane resin (trade name: Superflex 210, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.). A composition was prepared. (Preparation of adhesive composition 1) 50 parts by weight of methylol melamine is dissolved in pure water with respect to 100 parts by weight of a polyvinyl alcohol resin having an acetoacetyl group (average polymerization degree 1200, saponification degree 98.5 mol%, acetoacetylation degree 5 mol%).
  • a crosslinking agent trade name: Watersol S695, manufactured by DIC
  • urethane resin trade name: Superflex 210, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.
  • An aqueous solution having a solid concentration of 3.7% by weight was prepared, and 18 parts by weight of an aqueous solution containing an alumina colloid (average particle size 15 nm) having a positive charge at a solids concentration of 10% by weight with respect to 100 parts by weight of the aqueous solution. was prepared.
  • the easy-adhesion layer-forming composition was applied to one surface of the retardation film 1 to form an easy-adhesion layer having a thickness of 100 nm.
  • the adhesive composition 1 is applied to one surface of the polarizer so that the thickness after drying becomes 0.1 ⁇ m, and a hard-coated TAC film (TAC film (Konica Minolta)
  • TAC film Konica Minolta
  • the surface of the product (trade name: KC2UA) manufactured by the company and subjected to hard coat treatment) and the surface not subjected to hard coat treatment were bonded to the polarizer.
  • the adhesive composition 1 is applied to the easy-adhesion layer so that the thickness after drying becomes 0.1 ⁇ m, and the polarizer and the retardation film of the laminate of the polarizer and the TAC film are bonded together, A circularly polarizing plate was obtained. In addition, it bonded together so that the slow axis of retardation film and the absorption axis of a polarizer might make an angle of 45 degrees.
  • the evaluation results of the obtained circularly polarizing plate are shown in Table 1.
  • the circularly-polarizing plate which changed the thickness of the easily bonding layer into 200 nm or 400 nm, respectively was produced, and the obtained circularly-polarizing plate was evaluated similarly. The results are shown in Table 1.
  • Example 2 A circularly polarizing plate was produced in the same manner as in Example 1 except that in the easy-adhesion layer-forming composition, the addition amount of the crosslinking agent was 15 parts by weight.
  • the evaluation results of the obtained circularly polarizing plate are shown in Table 1.
  • the circularly-polarizing plate which changed the thickness of the easily bonding layer into 200 nm or 400 nm, respectively was produced, and the obtained circularly-polarizing plate was evaluated similarly. The results are shown in Table 1.
  • Example 3 A circularly polarizing plate was obtained in the same manner as in Example 1 except that an oxazoline group-containing water-soluble polymer (manufactured by Nippon Shokubai Co., Ltd., trade name: Epocross WS700) was used as the crosslinking agent contained in the easy-adhesion layer forming composition. .
  • the evaluation results of the obtained circularly polarizing plate are shown in Table 1.
  • the circularly-polarizing plate which changed the thickness of the easily bonding layer into 200 nm or 400 nm, respectively was produced, and the obtained circularly-polarizing plate was evaluated similarly. The results are shown in Table 1.
  • Example 4 A circularly polarizing plate was produced in the same manner as in Example 3 except that in the easy-adhesion layer-forming composition, the addition amount of the crosslinking agent was 15 parts by weight. The evaluation results of the obtained circularly polarizing plate are shown in Table 1. Moreover, the circularly-polarizing plate which changed the thickness of the easily bonding layer into 200 nm or 400 nm, respectively was produced, and the obtained circularly-polarizing plate was evaluated similarly. The results are shown in Table 1.
  • Example 5 A circularly polarizing plate was produced in the same manner as in Example 1 except that the retardation film 2 was used instead of the retardation film 1. The evaluation results of the obtained circularly polarizing plate are shown in Table 1. Moreover, the circularly-polarizing plate which changed the thickness of the easily bonding layer into 200 nm or 400 nm, respectively was produced, and the obtained circularly-polarizing plate was evaluated similarly. The results are shown in Table 1.
  • Example 6 A circularly polarizing plate was produced in the same manner as in Example 2 except that the retardation film 2 was used instead of the retardation film 1. The evaluation results of the obtained circularly polarizing plate are shown in Table 1. Moreover, the circularly-polarizing plate which changed the thickness of the easily bonding layer into 200 nm or 400 nm, respectively was produced, and the obtained circularly-polarizing plate was evaluated similarly. The results are shown in Table 1.
  • Example 7 A circularly polarizing plate was produced in the same manner as in Example 3 except that the retardation film 2 was used instead of the retardation film 1. The evaluation results of the obtained circularly polarizing plate are shown in Table 1. Moreover, the circularly-polarizing plate which changed the thickness of the easily bonding layer into 200 nm or 400 nm, respectively was produced, and the obtained circularly-polarizing plate was evaluated similarly. The results are shown in Table 1.
  • Example 8 A circularly polarizing plate was produced in the same manner as in Example 4 except that the retardation film 2 was used instead of the retardation film 1. The evaluation results of the obtained circularly polarizing plate are shown in Table 1. Moreover, the circularly-polarizing plate which changed the thickness of the easily bonding layer into 200 nm or 400 nm, respectively was produced, and the obtained circularly-polarizing plate was evaluated similarly. The results are shown in Table 1.
  • Example 9 (Preparation of adhesive composition 2) Active energy ray curing component (10 parts by weight of hydroxyethyl acrylamide, 30 parts by weight of acryloylmorpholine, 54.5 parts by weight of 1,9-nonanediol diacrylate), and a foam inhibitor (polyorganosiloxane (manufactured by Big Chemie Japan) , Trade name: BYK-UV 3570)) 0.50 part by weight, and 3 parts by weight of IRGACURE907 (manufactured by BASF) and 2 parts by weight of KAYACURE DETX-S (manufactured by Nippon Kayaku) as a polymerization initiator An adhesive composition 2 was prepared.
  • Active energy ray curing component (10 parts by weight of hydroxyethyl acrylamide, 30 parts by weight of acryloylmorpholine, 54.5 parts by weight of 1,9-nonanediol diacrylate), and a foam inhibitor (polyorganosiloxane (
  • a circularly polarizing plate was produced in the same manner as in Example 3 except that an adhesive layer having a thickness of 0.50 ⁇ m was formed using the obtained adhesive composition 2.
  • the evaluation results of the obtained circularly polarizing plate are shown in Table 1.
  • the circularly-polarizing plate which changed the thickness of the easily bonding layer into 200 nm or 400 nm, respectively was produced, and the obtained circularly-polarizing plate was evaluated similarly. The results are shown in Table 1.
  • Example 10 A circularly polarizing plate was produced in the same manner as in Example 4 except that the adhesive composition 2 was used to form an adhesive layer having a thickness of 0.50 ⁇ m.
  • the evaluation results of the obtained circularly polarizing plate are shown in Table 1.
  • the circularly-polarizing plate which changed the thickness of the easily bonding layer into 200 nm or 400 nm, respectively was produced, and the obtained circularly-polarizing plate was evaluated similarly. The results are shown in Table 1.
  • Example 1 A circularly polarizing plate was produced in the same manner as in Example 1 except that no crosslinking agent was added to the easy-adhesion layer-forming composition. The evaluation results of the obtained circularly polarizing plate are shown in Table 1. Moreover, the circularly-polarizing plate which changed the thickness of the easily bonding layer into 200 nm or 400 nm, respectively was produced, and the obtained circularly-polarizing plate was evaluated similarly. The results are shown in Table 1.
  • Example 2 In the same manner as in Example 1, except that an easy-adhesion layer having a thickness of 50 nm was formed using a silane coupling agent (trade name: KBM603, manufactured by Shin-Etsu Silicone Co., Ltd.) instead of the easy-adhesion layer-forming composition 1, circularly polarized light was used. A plate was made. The evaluation results of the obtained circularly polarizing plate are shown in Table 1.
  • a silane coupling agent trade name: KBM603, manufactured by Shin-Etsu Silicone Co., Ltd.
  • Example 3 A circularly polarizing plate was produced in the same manner as in Example 5 except that no crosslinking agent was added to the easy-adhesion layer-forming composition. The evaluation results of the obtained circularly polarizing plate are shown in Table 1. Moreover, the circularly-polarizing plate which changed the thickness of the easily bonding layer into 200 nm or 400 nm, respectively was produced, and the obtained circularly-polarizing plate was evaluated similarly. The results are shown in Table 1.
  • Example 4 In the same manner as in Example 5, except that an easy-adhesion layer having a thickness of 50 nm was formed using a silane coupling agent (trade name: KBM603, manufactured by Shin-Etsu Silicone Co., Ltd.) instead of the easy-adhesion layer-forming composition 1, circularly polarized light was used. A plate was made. The evaluation results of the obtained circularly polarizing plate are shown in Table 1.
  • a silane coupling agent trade name: KBM603, manufactured by Shin-Etsu Silicone Co., Ltd.
  • a modified polyolefin resin (manufactured by Unitika Ltd., trade name “Arrow”) is prepared so that the mass ratio (solid content) of the polyolefin-based component to the polyvinyl alcohol-based component is 90:10.
  • Base SE-1030N ") an aqueous solution of polyvinyl alcohol resin (product name” Gosefimer Z200 "manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) and pure water are used to form an easily adhesive layer forming composition.
  • a circularly polarizing plate was produced in the same manner as in Example 5 except that a 500 nm easy-adhesion layer was formed. The evaluation results of the obtained circularly polarizing plate are shown in Table 1.
  • the circularly polarizing plate of the present invention is suitably used for display devices such as liquid crystal display devices and organic EL display devices.
  • the circularly polarizing plate of the present invention can be suitably used regardless of the type of surface treatment.

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  • General Physics & Mathematics (AREA)
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Abstract

La présente invention se rapporte à une plaque de polarisation circulaire qui peut assurer l'adhérence entre un polariseur et un film de retard tout en pouvant maintenir d'excellentes caractéristiques antireflet. Une plaque de polarisation circulaire selon la présente invention est pourvue de manière séquentielle d'un polariseur, d'une couche hautement adhésive qui contient un agent de réticulation et une résine uréthane ayant un groupe carboxyle, et d'un film de retard qui contient une résine de polycarbonate et fait office de plaque λ/4, dans cet ordre. La différence d'indice de réfraction entre le film de retard et la couche hautement adhésive est de 0,01 ou moins.
PCT/JP2019/011968 2018-03-30 2019-03-22 Plaque de polarisation circulaire WO2019188743A1 (fr)

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Cited By (4)

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