WO2021131504A1 - Corps multicouche optique et dispositif d'affichage d'image - Google Patents

Corps multicouche optique et dispositif d'affichage d'image Download PDF

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Publication number
WO2021131504A1
WO2021131504A1 PCT/JP2020/044452 JP2020044452W WO2021131504A1 WO 2021131504 A1 WO2021131504 A1 WO 2021131504A1 JP 2020044452 W JP2020044452 W JP 2020044452W WO 2021131504 A1 WO2021131504 A1 WO 2021131504A1
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Prior art keywords
group
meth
sensitive adhesive
adhesive layer
acrylate
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PCT/JP2020/044452
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English (en)
Japanese (ja)
Inventor
亨 神野
悠司 淺津
白石　貴志
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住友化学株式会社
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Priority to KR1020227024438A priority Critical patent/KR20220116503A/ko
Priority to CN202080088943.8A priority patent/CN114846374A/zh
Publication of WO2021131504A1 publication Critical patent/WO2021131504A1/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
    • G02B5/3025—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
    • G02B5/3041—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 comprising multiple thin layers, e.g. multilayer stacks
    • 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
    • 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
    • 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
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • 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
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • 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
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • 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
    • C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • 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
    • G02B5/3083—Birefringent or phase retarding elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light

Definitions

  • the present invention relates to an optical laminate and a display device.
  • Polarizing plates made by laminating and laminating a protective film on one or both sides of a polarizer are used for image display devices such as liquid crystal display devices such as mobile televisions and organic electroluminescence (organic EL) display devices, especially in recent years. It is an optical member widely used in various mobile devices such as telephones, smartphones, and tablet terminals.
  • the polarizing plate is often used by being bonded to an image display element (liquid crystal cell, organic EL display element, etc.) via an adhesive layer (for example, Japanese Patent Application Laid-Open No. 2010-229321 (Patent Document 1)). Therefore, the polarizing plate may be marketed in the form of a polarizing plate with an adhesive layer in which an adhesive layer is previously provided on one surface of the polarizing plate.
  • Patent Document 2 by increasing the boric acid content in the polarizer, by generating many borate crosslinked, present in high stability I 3 complex is highly oriented It is described that the occurrence of blue leak is suppressed and a polarizer having excellent low-temperature and high-humidity durability can be obtained.
  • An object of the present invention is to provide a novel optical laminate in which color loss is suppressed at the end of a polarizer under high temperature and high humidity.
  • the present invention provides an optical laminate illustrated below and an image display device using the same.
  • An optical laminate having a polarizer and a light selective absorbing pressure-sensitive adhesive layer laminated in contact with the polarizer. Iodine is adsorbed and oriented in the polarizer, and the boron content is 5.0% by mass or less.
  • the light selective absorption pressure-sensitive adhesive layer is an optical laminate formed of a pressure-sensitive adhesive composition containing a light selective absorption agent and having an absorbance of 0.1 or more and 1.6 or less at a wavelength of 410 nm.
  • the optical laminate according to [1] further comprising a protective film laminated on the side of the polarizer opposite to the light selective absorption pressure-sensitive adhesive layer side.
  • the light selective absorbing pressure-sensitive adhesive layer according to [1] or [2], wherein the content of the light selective absorbing agent per unit area is 0.01 g / m 2 or more and 5 g / m 2 or less.
  • the pressure-sensitive adhesive composition contains 0.1 part by mass or more and 10 parts by mass or less of the optical selective absorber with respect to 100 parts by mass of all resin components.
  • An image display device including an image display panel and the optical laminate according to [8] arranged in front of the image display panel.
  • the image display device according to [9] wherein the image display panel is an organic EL display panel.
  • an optical laminate in which color loss is suppressed at an end portion of a polarizer in a high temperature and high humidity environment, and an image display device including the same.
  • the optical laminate of the present invention has a polarizer and a light selective absorbing pressure-sensitive adhesive layer laminated in contact with the polarizer.
  • An example of the layer structure of the optical laminate of the present invention is shown in FIGS. 1 and 2.
  • FIG. 1 is a schematic cross-sectional view of an example of the optical laminate of the present invention.
  • the optical laminate 100 shown in FIG. 1 has a protective film 11, a polarizer 10, and a light selective absorbing pressure-sensitive adhesive layer 20 in this order.
  • FIG. 2 is a schematic cross-sectional view of an example of the optical laminate of the present invention.
  • the optical laminate 200 shown in FIG. 2 has an optical laminate 100 shown in FIG. 1 and a retardation laminate 300 laminated on the light selective absorption adhesive layer 20 side of the optical laminate 100.
  • the retardation laminate 300 includes a first retardation layer 30, an adhesive layer 33, a second retardation layer 31, and a second adhesive in order from the light selective absorption pressure-sensitive adhesive layer 20 side of the optical laminate 100. It has a layer 32 and.
  • the thicknesses of the optical laminates 100 and 200 are not particularly limited because they differ depending on the functions required of the optical laminate and the application of the optical laminate, but for example, they may be 5 ⁇ m or more and 200 ⁇ m or less, and 10 ⁇ m or more and 150 ⁇ m or less. It may be 120 ⁇ m or less.
  • the light selective absorption pressure-sensitive adhesive layer contains a light selective absorption agent.
  • at least the light selective absorption pressure-sensitive adhesive layer has light selective absorption performance, so that the optical laminate as a whole also has light selective absorption performance. Therefore, the optical laminate of the present invention has a function of protecting the image display element from ultraviolet rays when used on the image display element.
  • the optical laminate of the present invention may have a structure including a layer having light selective absorption performance in addition to the light selective absorption pressure-sensitive adhesive layer.
  • Examples of the other layer include the protective film 11.
  • the light selective absorption adhesive layer has the light selective absorption performance and contributes to the development of the light selective absorption performance of the entire optical laminate, so that the light selective absorption performance of the other layers can be improved.
  • the degree of design freedom can be improved.
  • the protective film 11 may need to be designed to be thicker in order to improve the light selective absorption performance, but the protective film 11 has a high degree of freedom in designing the light selective absorption performance. It becomes easy to make a thin film.
  • the present inventors have found that there is a correlation between the content of the light selective absorber contained in the pressure-sensitive adhesive layer and the degree of color loss at the end of the polarizer under high temperature and high humidity. .. Based on this finding, it is considered that the light selective absorber in the pressure-sensitive adhesive layer easily migrates to the polarizer side under high temperature and high humidity, and such migration is one of the factors that cause color loss.
  • the present inventors have conducted further diligent studies, and even when the pressure-sensitive adhesive layer contains a light selective absorber, by adjusting the absorbance of the pressure-sensitive adhesive layer, the end portion of the polarizer under high temperature and high humidity It was found that the color loss in the above can be suppressed, and the present invention was reached.
  • the polarizer has a property of absorbing linearly polarized light having a vibration plane parallel to its absorption axis and transmitting linearly polarized light having a vibration plane orthogonal to the absorption axis (parallel to the transmission axis).
  • the polarizer 10 in the optical laminate of the present invention has iodine adsorbed and oriented, and has a boron content of 5.0% by mass or less. With a structure in which the boron content is 5.0% by mass or less, preferably 4.5% by mass or less, shrinkage caused by heating can be suppressed.
  • the content of boron is preferably 0.5% by mass or more, and more preferably 1% by mass or more.
  • Boron in the polarizer 10 improves the degree of cross-linking of the polarizer 10 and contributes to stably retaining iodine in the polarizer 10. Therefore, when the boron content is low, iodine is stably retained. It is considered that it cannot be held and color loss occurs. In the present invention, even if the boron content of the polarizer 10 is 5.0% by mass or less, color loss under high temperature and high humidity can be suppressed.
  • Examples of the polarizer 10 include a stretched film or a stretched layer on which a dichroic dye having absorption anisotropy is adsorbed, a cured product of a polymerizable liquid crystal compound, and a liquid crystal cured layer containing a dichroic dye.
  • the dichroic dye refers to a dye having a property in which the absorbance in the major axis direction and the absorbance in the minor axis direction of the molecule are different, and iodine is preferably used as the dye.
  • the polarizing film which is a stretched film or stretched layer on which a dye having absorption anisotropy is adsorbed, is usually a step of uniaxially stretching a polyvinyl alcohol-based resin film, and the polyvinyl alcohol-based resin film is dyed with a dichroic dye such as iodine. This is produced through a step of adsorbing the dichroic dye, a step of treating the polyvinyl alcohol-based resin film on which the dichroic dye is adsorbed with an aqueous boric acid solution, and a step of washing with water after the treatment with the aqueous boric acid solution. be able to.
  • the thickness of the polarizer is usually 30 ⁇ m or less, preferably 15 ⁇ m or less, more preferably 13 ⁇ m or less, further preferably 10 ⁇ m or less, and particularly preferably 8 ⁇ m or less.
  • the thickness of the polarizer is usually 2 ⁇ m or more, preferably 3 ⁇ m or more, for example, 5 ⁇ m or more.
  • the polyvinyl alcohol-based resin is obtained by saponifying the polyvinyl acetate-based resin.
  • the polyvinyl acetate-based resin in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith is used.
  • examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acid compounds, olefin compounds, vinyl ether compounds, unsaturated sulfone compounds, and (meth) acrylamide compounds having an ammonium group. ..
  • the saponification degree of the polyvinyl alcohol-based resin is usually about 85 mol% or more and 100 mol% or less, preferably 98 mol% or more.
  • the polyvinyl alcohol-based resin may be modified, and polyvinyl formal, polyvinyl acetal, and the like modified with aldehydes can also be used.
  • the degree of polymerization of the polyvinyl alcohol-based resin is usually 1000 or more and 10000 or less, preferably 1500 or more and 5000 or less.
  • the polarizer which is a stretched layer on which a dye having absorption anisotropy is adsorbed, is usually a step of applying a coating liquid containing the polyvinyl alcohol-based resin on a base film, and a step of uniaxially stretching the obtained laminated film.
  • the base film used for forming the polarizer may be used as the protective film 11. If necessary, the base film may be peeled off from the polarizer.
  • the material and thickness of the base film may be the same as the material and thickness of the protective film 11
  • the protective film 11 is made of an optically transparent thermoplastic resin such as a cyclic polyolefin resin; a cellulose acetate resin composed of a resin such as triacetyl cellulose or diacetyl cellulose; a resin such as polyethylene terephthalate, polyethylene naphthalate, or polybutylene terephthalate. Polyester resin; Polycarbonate resin; (meth) acrylic resin; Polypropylene resin, a coating layer or film composed of one or a mixture of two or more of these.
  • the protective film 11 may contain a light selective absorber described later. Since the light selective absorber contained in the protective film 11 is held in the protective film 11, it is unlikely that the light selective absorber will be transferred to the polarizer.
  • a hard coat layer may be formed on the protective film 11.
  • the hard coat layer may be formed on one surface of the protective film 11 or may be formed on both sides. By providing the hard coat layer, the protective film 11 having improved hardness and scratchability can be obtained.
  • the hard coat layer may be, for example, a cured layer such as an acrylic resin, a silicone resin, a polyester resin, a urethane resin, an amide resin, or an epoxy resin.
  • the hard coat layer may contain additives to improve strength. Additives are not limited and include inorganic fine particles, organic fine particles, or mixtures thereof.
  • the hard coat layer is, for example, a cured layer of an ultraviolet curable resin. Examples of the ultraviolet curable resin include acrylic resin, silicone resin, polyester resin, urethane resin, amide resin, epoxy resin and the like.
  • the thickness of the protective film is usually 1 to 100 ⁇ m, but is preferably 5 to 80 ⁇ m (from the viewpoint of strength, handleability, etc.), more preferably 8 to 60 ⁇ m, and further preferably 12 to 45 ⁇ m. preferable.
  • the resin film which is the protective film 11, is attached to the polarizer 10 via, for example, an adhesive layer.
  • the adhesive forming the adhesive layer include a water-based adhesive, an active energy ray-curable adhesive, and a thermosetting adhesive, and a water-based adhesive and an active energy ray-curable adhesive can be used. preferable.
  • the two opposing surfaces bonded via the adhesive layer may be subjected to corona treatment, plasma treatment, flame treatment or the like in advance, or may have a primer layer or the like.
  • the light-selective absorbent pressure-sensitive adhesive layer 20 can be formed by applying a diluent in which the pressure-sensitive adhesive composition is dissolved or dispersed in an organic solvent onto a substrate and drying the pressure-sensitive adhesive composition.
  • a plastic film is preferable as the base material, and specific examples thereof include a release film that has been subjected to a mold release treatment.
  • the release film include those in which one surface of a film made of a resin such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, or polyarylate is subjected to a mold release treatment such as silicone treatment.
  • the thickness of the light selective absorption pressure-sensitive adhesive layer is, for example, 0.1 ⁇ m or more and 150 ⁇ m or less.
  • it When laminated with an image display panel, it is usually 8 ⁇ m or more and 60 ⁇ m or less, and from the viewpoint of thinning, it is preferably 30 ⁇ m or less, more preferably 25 ⁇ m or less, and particularly preferably 20 ⁇ m or less.
  • another optical film for example, a ⁇ / 4 retardation layer
  • it is usually 2 ⁇ m or more and 30 ⁇ m or less, preferably 25 ⁇ m or less, more preferably 20 ⁇ m or less, particularly preferably 18 ⁇ m or less, and preferably 3 ⁇ m or more.
  • it may be 10 ⁇ m or more, but 10 ⁇ m or less, particularly 7 ⁇ m or less is preferable in terms of further thinning.
  • the light selective absorption pressure-sensitive adhesive layer preferably has an absorbance at a wavelength of 410 nm of 0.1 or more and 1.6 or less, and more preferably 0.2 or more and 1.5 or less. This is because the light selective absorption pressure-sensitive adhesive layer 20 having such an absorbance makes it easy to form the entire optical laminate in a thin shape while exhibiting desired light selective absorption performance as the entire optical laminate.
  • the light-selective absorbent adhesive layer The absorbance at a wavelength of 390 nm is usually 5.0 or less and may be 4.5 or less, and the absorbance at a wavelength of 400 nm is usually 5.0 or less and may be 4.5 or less. Is usually 1.00 or less, preferably 0.60 or less, more preferably 0.40 or less, and 0.00 or more.
  • the absorbance at a wavelength of 430 nm is usually less than 0.20, preferably 0.18 or less, more preferably 0.10 or less, particularly preferably 0.05 or less, 0.00 or more.
  • the absorbance at a wavelength of 440 nm is usually less than 0.10, preferably 0.05 or less, and 0.00 or more.
  • the light selective absorbing pressure-sensitive adhesive layer preferably has a content of the light selective absorbing agent per unit area of 0.01 g / m 2 or more and 5 g / m 2 or less. Within such a range, it is possible to suppress color loss of the polarizer that occurs under high temperature and high humidity.
  • the pressure-sensitive adhesive composition contains a resin and a light selective absorber, and preferably contains a cross-linking agent.
  • the resin is a resin whose main component is a resin such as (meth) acrylic, rubber, urethane, ester, silicone, or polyvinyl ether. Among these, a resin containing (meth) acrylic resin (A) as a main component is preferable.
  • the light selective absorber selectively absorbs light having a specific wavelength, and preferably contains a compound having at least one absorption maximum at a wavelength of 360 nm to 420 nm, and preferably contains a compound having an absorption maximum at 380 nm to 410 nm. It is more preferable to include it.
  • Examples of the light selective absorber (hereinafter, may be referred to as a light selective absorber (A)) containing a compound having an absorption maximum in the vicinity of a wavelength of 350 nm include an oxybenzophenone-based light selective absorber and a benzotriazole-based light selective absorption agent.
  • Examples thereof include organic photoselective absorbers such as agents, salicylate ester-based photoselective absorbers, benzophenone-based photoselective absorbers, cyanoacrylate-based photoselective absorbers, and triazine-based photoselective absorbers.
  • the light selective absorber (A) a commercially available product may be used.
  • a commercially available product may be used.
  • "Kemisorb 102” manufactured by Chemipro Kasei Co., Ltd., "ADEKA STAB LA46” manufactured by ADEKA Corporation, and "ADEKA STAB” are used.
  • Benzotriazole-based photoselective absorbers include “ADEKA STAB LA31” and “ADEKA STAB LA36” manufactured by ADEKA Corporation, “Sumisorb 200", “Sumisorb 250”, “Sumisorb 300”, and “Sumisorb 340” manufactured by Sumika Chemtex Co., Ltd. And “Sumisorb 350”, “Kemisorb 74", “Kemisorb 79” and “Kemisorb 279” made by Chemipro Kasei Co., Ltd., "TINUVIN 99-2", “TINUVIN 900” and “TINUVIN 928” made by BASF, etc. Can be mentioned.
  • the light selective absorber (A) may be an inorganic light selective absorber.
  • the inorganic light selective absorber include titanium oxide, zinc oxide, indium oxide, tin oxide, talc, kaolin, calcium carbonate, titanium oxide-based composite oxide, zinc oxide-based composite oxide, ITO (tin-doped indium oxide), and the like.
  • ATO antimonated tin oxide
  • the titanium oxide-based composite oxide include silica and zinc oxide doped with alumina.
  • the light selective absorber (hereinafter, may be referred to as a light selective absorber (B)) containing a compound having an absorption maximum in the vicinity of a wavelength of 405 nm is preferably a compound satisfying the following formula (5), and further described below. It is more preferable that the compound satisfies the formula (6).
  • ⁇ (405) ⁇ 20 (5) [In formula (5), ⁇ (405) represents the gram extinction coefficient of the compound at a wavelength of 405 nm. The unit of the gram extinction coefficient is L / (g ⁇ cm).
  • ⁇ (405) represents the gram extinction coefficient of the compound at a wavelength of 405 nm
  • ⁇ (440) represents the gram extinction coefficient at a wavelength of 440 nm.
  • the gram absorbance coefficient is measured by the method described in Examples.
  • a compound having a larger value of ⁇ (405) is more likely to absorb light having a wavelength of 405 nm, and suppresses deterioration of the optical laminate and the image display device in ultraviolet rays or visible light having a short wavelength. If the value of ⁇ (405) is less than 20 L / (g ⁇ cm), the ultraviolet rays of the retardation film or the organic EL light emitting device must be increased unless the content of the light selective absorber (B) in the pressure-sensitive adhesive composition is increased. It tends to be difficult to exhibit the deterioration suppression function due to visible light of short wavelengths.
  • ⁇ (405) is preferably 20 L / (g ⁇ cm) or more, more preferably 30 L / (g ⁇ cm) or more, and even more preferably 40 L / (g ⁇ cm) or more. Preferably, it is usually 500 L / (g ⁇ cm) or less.
  • the value of ⁇ (405) / ⁇ (440) is preferably 20 or more, more preferably 40 or more, even more preferably 70 or more, and particularly preferably 80 or more.
  • the compound that selectively absorbs light having a wavelength of 405 nm is preferably a compound having a merocyanine structure in the molecule.
  • the molecular weight of the compound containing a merocyanine structure in the molecule is preferably 100 or more and 3000 or less.
  • R 1 and R 5 each independently have a hydrogen atom, an alkyl group having 1 to 25 carbon atoms which may have a substituent, and 7 to 7 carbon atoms which may have a substituent. It represents 15 aralkyl groups, an aryl group having 6 to 15 carbon atoms, and a heterocyclic group, and -CH 2- contained in the alkyl group or aralkyl group is -NR 1A- , -CO-, -SO 2-, -O. It may be replaced with-or-S-.
  • R 1A represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
  • R 2 , R 3 and R 4 independently have a hydrogen atom, an alkyl group having 1 to 6 carbon atoms which may have a substituent, and an aromatic hydrocarbon group which may have a substituent. Alternatively, it represents an aromatic heterocyclic group which may have a substituent, and -CH 2- contained in the alkyl group is -NR 1 B-, -CO-, -SO 2- , -O- or -S. It may be replaced with-.
  • R1B represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
  • R 6 and R 7 may independently represent a hydrogen atom, an alkyl group having 1 to 25 carbon atoms or an electron-withdrawing group, or R 6 and R 7 may be linked to each other to form a ring structure. .. R 1 and R 2 may be connected to each other to form a ring structure, R 2 and R 3 may be connected to each other to form a ring structure, and R 2 and R 4 may be connected to each other to form a ring structure. R 3 and R 6 may be connected to each other to form a ring structure. ]
  • Examples of the alkyl group having 1 to 25 carbon atoms represented by R 1 and R 5 include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, a 2-cyanopropyl group, an n-butyl group, and a tert-butyl group. Examples thereof include sec-butyl group, n-pentyl group, n-hexyl group, 1-methylbutyl group, 3-methylbutyl group, n-octyl group, n-decyl, 2-hexyl-octyl group and the like.
  • alkyl group having 1 to 25 carbon atoms represented by R 1 and R 5 may have include the groups described in the following group A.
  • Group A Nitro group, hydroxy group, carboxy group, sulfo group, cyano group, amino group, halogen atom, alkoxy group having 1 to 6 carbon atoms, alkylsilyl group having 1 to 12 carbon atoms, alkyl having 2 to 8 carbon atoms.
  • R a1 and R a2 each independently represent an alkanediyl group having 1 to 6 carbon atoms, R a3 is a C1- 6 represents an alkyl group, and t1 represents an integer of 1 to 3).
  • Examples of the alkylsilyl group having 1 to 12 carbon atoms include a monoalkylsilyl group such as a methylsilyl group, an ethylsilyl group, and a propylsilyl group; a dialkylsilyl group such as a dimethylsilyl group, a diethylsilyl group, and a methylethylsilyl group; Examples thereof include a trialkylsilyl group such as a tripropylsilyl group.
  • Examples of the alkylcarbonyl group having 2 to 8 carbon atoms include a methylcarbonyl group and an ethylcarbonyl group.
  • Examples of the halogen atom include a fluorine atom, a chlorine atom and a bromine atom.
  • Examples of the aralkyl group having 7 to 15 carbon atoms represented by R 1 and R 5 include a benzyl group and a phenylethyl group. Examples of the group in which -CH 2- contained in the aralkyl group is replaced with -SO 2- or -COO- include a 2-phenylacetate ethyl group and the like. Examples of the substituent that the aralkyl group having 7 to 15 carbon atoms represented by R 1 and R 5 may have include the group described in the above group A. Examples of the aryl group having 6 to 15 carbon atoms represented by R 1 and R 5 include a phenyl group, a naphthyl group, an anthracenyl group and the like.
  • Examples of the substituent that the aryl group having 6 to 15 carbon atoms represented by R 1 and R 5 may have are the groups described in the above group A.
  • Examples of the heterocyclic group having 6 to 15 carbon atoms represented by R 1 and R 5 include carbons such as pyridyl group, pyrrolidyl group, quinolyl group, thiophene group, imidazolyl group, oxazolyl group, pyrrole group, thiazolyl group and furanyl group.
  • Aromatic heterocyclic groups of numbers 3-9 can be mentioned.
  • Alkyl groups having 1 to 6 carbon atoms represented by R 1A and R 1B include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, tert-butyl group, sec-butyl group and n. -Pentyl group, n-hexyl group and the like can be mentioned.
  • Examples of the alkyl group having 1 to 6 carbon atoms represented by R 2 , R 3 and R 4 include the same alkyl group having 1 to 6 carbon atoms represented by R 1B.
  • the R 2, R 3 and substituents which may be alkyl groups have a carbon number 1 to 6 represented by R 4, include groups described in the above group A.
  • the R 2, R 3 and the aromatic hydrocarbon group substituents which may be possessed by represented by R 4 include groups described in the above group A.
  • the aromatic heterocyclic ring represented by R 2, R 3 and R 4, a pyridyl group, a pyrrolidyl group, a quinolyl group, a thiophene group, an imidazolyl group, an oxazolyl group, a pyrrole group, carbon atoms, such as thiazolyl group and a furanyl group 3 9 to 9 aromatic heterocyclic groups can be mentioned.
  • the R 2, R 3 and the aromatic heterocyclic ring substituent which may have represented by R 4 include groups described in the above group A.
  • Examples of the alkyl group having 1 to 25 carbon atoms represented by R 6 and R 7 include the same alkyl group having 1 to 25 carbon atoms represented by R 1 and R 5.
  • Examples of the substituent that the alkyl group having 1 to 25 carbon atoms represented by R 6 and R 7 may have include the group described in the above group A.
  • Examples of the alkyl group having 1 to 25 carbon atoms represented by R 6 and R 7 include the same alkyl group having 1 to 25 carbon atoms represented by R 1 and R 5.
  • Examples of the electron-withdrawing group represented by R 6 and R 7 include a cyano group, a nitro group, a halogen atom, an alkyl group substituted with a halogen atom, and a group represented by the formula (I-1). ..
  • R 11 represents a hydrogen atom or an alkyl group having 1 to 25 carbon atoms, and at least one of the methylene groups contained in the alkyl group may be substituted with an oxygen atom.
  • X 1 represents -CO-, -COO-, -OCO-, -CS-, -CSO-, -CSS-, -NR 12 CO- or CONR 13-.
  • R 12 and R 13 independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a phenyl group.
  • halogen atom examples include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
  • Alkyl groups substituted with halogen atoms include, for example, trifluoromethyl group, perfluoroethyl group, perfluoropropyl group, perfluoroisopropyl group, perfluorobutyl group, perfluorosec-butyl group, perfluorotert-butyl group, perfluoropentyl group and Examples thereof include a perfluoroalkyl group such as a perfluorohexyl group.
  • the number of carbon atoms of the alkyl group substituted with the halogen atom is usually 1 to 25.
  • R 6 and R 7 may be connected to each other to form a ring structure, and examples of the ring structure formed from R 6 and R 7 include Meldrum's acid structure, barbituric acid structure, and dimedone structure. Be done.
  • Examples of the alkyl group having 1 to 25 carbon atoms represented by R 11 include the same alkyl groups represented by R 1 and R 5.
  • the ring structure R 2 and R3 are bonded to each other to form, a nitrogen-containing ring structure containing a nitrogen atom bonded with R 2, for example, include nitrogen-containing heterocyclic 4-14 membered ring Be done.
  • the ring structure formed by connecting R 2 and R 3 to each other may be monocyclic or polycyclic. Specific examples thereof include a pyrrolidine ring, a pyrroline ring, an imidazolidine ring, an imidazoline ring, an oxazoline ring, a thiazolin ring, a piperidine ring, a morpholine ring, a piperazine ring, an indole ring, and an isoindole ring.
  • the ring structure formed by bonding R 1 and R 2 to each other is a nitrogen-containing ring structure containing a nitrogen atom to which R 1 and R 2 are bonded, and is, for example, a 4- to 14-membered ring (preferably).
  • a nitrogen-containing heterocycle (4 to 8-membered ring) can be mentioned.
  • the ring structure formed by connecting R 1 and R 2 to each other may be monocyclic or polycyclic. Specifically, the same ring structure formed by connecting R 2 and R 3 to each other can be mentioned.
  • Examples of the ring structure formed by bonding R 2 and R 4 to each other include a nitrogen-containing ring structure having a 4- to 14-membered ring, and a nitrogen-containing ring structure having a 5-membered ring to a 9-membered ring is preferable.
  • the ring structure formed by bonding R 2 and R 4 to each other may be monocyclic or polycyclic. These rings may have a substituent, and examples of such a ring structure include the same ring structures as those exemplified as the ring structure formed by R 2 and R 3.
  • a phenyl group and the like can be mentioned.
  • Examples of the compound represented by the formula (I) in which R 2 and R 3 are connected to each other to form a ring structure include a compound represented by the formula (IA), in which R 2 and R 4 are connected to each other.
  • Examples of the compound represented by the formula (I) which is linked to form a ring structure include a compound represented by the formula (IB).
  • Ring W 1 and ring W 2 represent a nitrogen-containing ring containing a nitrogen atom as a constituent unit of the ring.
  • Ring W 1 and ring W 2 may be monocyclic or polycyclic independently of each other, and may contain a heteroatom other than nitrogen as a ring constituent unit. It is preferable that the ring W 1 and the ring W 2 are independently 5-membered to 9-membered rings.
  • the compound represented by the formula (IA) is preferably a compound represented by the formula (IA-1).
  • R 1 , R 4 , R 5 , R 6 and R 7 have the same meanings as described above, respectively.
  • a 1 represents -CH 2- , -O-, -S- or -NR 1 D-.
  • R 14 and R 15 each independently represent a hydrogen atom or an alkyl group having 1 to 12 carbon atoms.
  • R 1D represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
  • the compound represented by the formula (IB) is preferably a compound represented by the formula (IB-1) and a compound represented by the formula (IB-2).
  • R 1 , R 6 and R 7 have the same meanings as described above, respectively.
  • R 16 independently represents a hydrogen atom or an alkyl group or an aryl group having 1 to 12 carbon atoms.
  • R 3 , R 5 , R 6 and R 7 have the same meanings as described above.
  • R 30 is a hydrogen atom, a cyano group, a nitro group, a halogen atom, a mercapto group, an amino group, an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, and an aromatic hydrocarbon having 6 to 18 carbon atoms. It represents a group, an acyl group having 2 to 13 carbon atoms, an acyloxy group having 2 to 13 carbon atoms, or an alkoxycarbonyl group having 2 to 13 carbon atoms.
  • R 31 is an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, a mercapto group, an alkylthio group having 1 to 12 carbon atoms, an amino group or a heterocyclic group which may have a substituent. Represent. ]
  • Examples of the halogen atom represented by R 30 include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
  • Examples of the acyloxy group having 2 to 13 carbon atoms represented by R 30 include a methylcarbonyloxy group, an ethylcarbonyloxy group, a propylcarbonyloxy group, a butylcarbonyloxy group and the like.
  • Examples of the alkoxycarbonyl group having 2 to 13 carbon atoms represented by R 30 include a methoxycarbonyl group, an ethoxycarbonyl group, a propoxycarbonyl group, and a butoxycarbonyl group.
  • Examples of the alkyl group having 1 to 12 carbon atoms represented by R 30 include the same alkyl group having 1 to 12 carbon atoms represented by R 14. Examples of the alkyl group having 1 to 12 carbon atoms represented by R 30 include a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group and the like. R 30 is preferably an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an amino group or a mercapto group.
  • Examples of the alkyl group having 1 to 12 carbon atoms represented by R 31 include the same alkyl group having 1 to 12 carbon atoms represented by R 14.
  • Examples of the alkoxy group having 1 to 12 carbon atoms represented by R 31 include the same alkoxy group having 1 to 12 carbon atoms represented by R 30.
  • Examples of the alkylthio group having 1 to 12 carbon atoms represented by R 31 include a methylthio group, an ethylthio group, a propylthio group, a butylthio group, a pentylthio group, a hexylthio group and the like.
  • amino group which may have a substituent represented by R 31 it was substituted with one alkyl group having 1 to 8 carbon atoms such as an amino group; an N-methylamino group and an N-ethylamino group.
  • heterocycle represented by R 31 include nitrogen-containing heterocyclic groups having 4 to 9 carbon atoms such as a pyrrolidinyl group, a piperidinyl group, and a morpholinyl group.
  • R 1 , R 6 and R 7 have the same meanings as above.
  • R 21 and R 22 independently represent a hydrogen atom and an alkyl group or a hydroxy group having 1 to 12 carbon atoms.
  • R 25 represents an aromatic hydrocarbon group which may have a hydrogen atom, an alkyl group having 1 to 25 carbon atoms, and a substituent.
  • Examples of the alkyl group having 1 to 25 carbon atoms represented by R 25 include the same alkyl groups having 1 to 25 carbon atoms represented by R 1.
  • R 3 and R 6 are independently attracting electrons.
  • the compound represented by the formula (I) in which R 1 and R 2 are linked to each other to form a ring structure and R 3 and R 6 are bonded to each other to form a ring structure is represented by the formula (ID). Examples thereof include compounds represented by.
  • R 4 , R 5 , and R 7 have the same meanings as above.
  • R 25 , R 26 , R 27 and R 28 each independently represent a hydrogen atom, an alkyl group having 1 to 12 carbon atoms which may have a substituent, a hydroxy group, and an aralkyl group.
  • Examples of the alkyl group having 1 to 12 carbon atoms represented by R 25 , R 26 , R 27 and R 28 include the same alkyl group having 1 to 12 carbon atoms represented by R 1A and R 1B. Examples of the substituent that the alkyl group having 1 to 12 carbon atoms represented by R 25 , R 26 , R 27 and R 28 may have is a hydroxy group. Examples of the aralkyl group represented by R 25 , R 26 , R 27 and R 28 include an aralkyl group having 7 to 15 carbon atoms such as a benzyl group and a phenylethyl group.
  • Examples of the compound (I) in which R 6 and R 7 are linked to each other to form a ring structure include a compound represented by the formula (IE).
  • Ring W 3 being representative of the cyclic compounds
  • Ring W 3 is a 5-membered to 9-membered ring, and may contain a hetero atom such as a nitrogen atom, an oxygen atom, or a sulfur atom as a constituent unit of the ring.
  • the compound represented by the formula (IE) is preferably a compound represented by the formula (IE-1).
  • R 1 , R 2 , R 3 and R 5 have the same meanings as described above.
  • R 17 , R 18 , R 19 , and R q each independently represent an alkyl group, an aralkyl group, or an aryl group having 1 to 12 carbon atoms which may have a hydrogen atom or a substituent, and the alkyl group or the alkyl group or
  • You may. m, p, and
  • Examples of the compound represented by the formula (I) include the following compounds.
  • the total content of the light selective absorber is not limited as long as the absorbance of the pressure-sensitive adhesive layer at a wavelength of 410 nm is selected to be 0.1 or more and 1.6 or less, but in the pressure-sensitive adhesive composition, for example, all resins. It is 0.01 to 20 parts by mass, preferably 0.05 to 15 parts by mass, and more preferably 0.1 to 10 parts by mass with respect to 100 parts by mass of the component.
  • the mass ratio of the light selective absorber (A) to the light selective absorber (B) (light selective absorber (A) / light selective absorption (B)) is usually 0.05 to 20, preferably 0. It is 1 to 10.
  • the (meth) acrylic resin (A) is preferably a polymer containing a structural unit derived from the (meth) acrylic acid ester as a main component (preferably containing 50% by mass or more).
  • the structural unit derived from the (meth) acrylic acid ester is a structural unit derived from one or more monomers other than the (meth) acrylic acid ester (for example, a structural unit derived from a monomer having a polar functional group). It may be included.
  • (meth) acrylic acid means that either acrylic acid or methacrylic acid may be used, and "(meth)" in the case of (meth) acrylate or the like has the same meaning. ..
  • Examples of the (meth) acrylic acid ester include (meth) acrylic acid ester represented by the following formula (X).
  • R 101 is represented by a hydrogen atom or a methyl group
  • R 102 represents an alkyl group having 1 to 14 carbon atoms or an aralkyl group having 7 to 20 carbon atoms
  • hydrogen of the alkyl group or the aralkyl group The atom may be replaced with an alkoxy group having 1 to 10 carbon atoms.
  • R 102 is preferably an alkyl group having 1 to 14 carbon atoms, and more preferably an alkyl group having 1 to 8 carbon atoms.
  • (meth) acrylic acid ester represented by the formula (X), Methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, N-Heptyl (meth) acrylate, n-octyl (meth) acrylate, n-nonyl (meth) acrylate, n-decyl (meth) acrylate, n-dodecyl (meth) acrylate, (meth) acrylate Linear alkyl esters of (meth) acrylic acid, such as lauryl, stearyl (meth) acrylic acid, etc .; (Meta) i-propyl acrylate, (meth) i-butyl acrylate, t-butyl (
  • Alkyl ester Cyclohexyl (meth) acrylate, isobolonyl (meth) acrylate, adamantyl (meth) acrylate, dicyclopentanyl (meth) acrylate, cyclododecyl (meth) acrylate, methylcyclohexyl (meth) acrylate, ( Alicyclic skeleton-containing alkyl ester of (meth) acrylic acid such as trimethylcyclohexyl acrylate, tert-butylcyclohexyl (meth) acrylate, cyclohexyl ⁇ -ethoxyacrylate, etc.; Aromatic ring skeleton-containing ester of (meth) acrylic acid such as phenyl (meth) acrylic acid; And so on.
  • a substituent-containing (meth) acrylic acid alkyl ester in which a substituent is introduced into the alkyl group in the (meth) acrylic acid alkyl ester can also be mentioned.
  • the substituent of the substituent-containing (meth) acrylic acid alkyl ester is a group that substitutes a hydrogen atom of the alkyl group, and specific examples thereof include a phenyl group, an alkoxy group, and a phenoxy group.
  • Specific examples of the substituent-containing (meth) acrylic acid alkyl ester include (meth) acrylic acid 2-methoxyethyl, (meth) acrylic acid ethoxymethyl, (meth) acrylic acid phenoxyethyl, and (meth) acrylic acid 2-. Examples thereof include (2-phenoxyethoxy) ethyl, phenoxydiethylene glycol (meth) acrylate, and phenoxypoly (ethylene glycol) (meth) acrylate.
  • Each of these (meth) acrylic acid esters can be used alone, or a plurality of different ones may be used.
  • the (meth) acrylic resin (A) is a structural unit derived from an acrylic acid alkyl ester (a1) having a homopolymer glass transition temperature Tg of less than 0 ° C., and an alkyl acrylate having a homopolymer Tg of 0 ° C. or higher. It preferably contains a structural unit derived from the ester (a2). It is advantageous to contain the structural unit derived from the acrylic acid alkyl ester (a1) and the structural unit derived from the acrylic acid alkyl ester (a2) in order to enhance the high temperature durability of the pressure-sensitive adhesive layer.
  • Tg of the homopolymer of the (meth) acrylic acid alkyl ester a literature value such as POLYMER HANDBOOK (Wiley-Interscience) can be adopted.
  • acrylic acid alkyl ester (a1) examples include ethyl acrylate, n- and i-propyl acrylate, n- and i-butyl acrylate, n-pentyl acrylate, n- and i-hexyl acrylate. , N-heptyl acrylate, n- and i-octyl acrylate, 2-ethylhexyl acrylate, n- and i-nonyl acrylate, n- and i-decyl acrylate, n-dodecyl acrylate and the like
  • acrylic acid alkyl esters having a group having about 2 to 12 carbon atoms examples include acrylic acid alkyl esters having a group having about 2 to 12 carbon atoms.
  • Acrylic acid alkyl ester (a1) may be used alone or in combination of two or more. Among them, n-butyl acrylate, n-octyl acrylate, 2-ethylhexyl acrylate and the like are preferable from the viewpoint of followability and reworkability when the pressure-sensitive adhesive layer of the present invention is laminated on the optical laminate.
  • the acrylic acid alkyl ester (a2) is an acrylic acid alkyl ester other than the acrylic acid alkyl ester (a1).
  • Specific examples of the acrylic acid alkyl ester (a2) include methyl acrylate, cyclohexyl acrylate, and isobolonyl acrylate. Includes stearyl acrylate, t-butyl acrylate and the like.
  • Acrylic acid alkyl ester (a2) may be used alone or in combination of two or more. Above all, from the viewpoint of high temperature durability, the acrylic acid alkyl ester (a2) preferably contains methyl acrylate, cyclohexyl acrylate, isobolonyl acrylate and the like, and more preferably contains methyl acrylate.
  • the structural unit derived from the (meth) acrylic acid ester represented by the formula (I) is preferably 50% by mass or more, preferably 60 to 95% by mass, based on the total structural units contained in the (meth) acrylic resin. It is preferably 65 to 95% by mass or more, and more preferably 65 to 95% by mass or more.
  • the structural unit derived from the monomer other than the (meth) acrylic acid ester the structural unit derived from the monomer having a polar functional group is preferable, and the structure derived from the (meth) acrylic acid ester having a polar functional group is preferable.
  • the unit is more preferred.
  • the polar functional group include a hydroxy group, a carboxyl group, a substituted or unsubstituted amino group, a heterocyclic group such as an epoxy group, and the like.
  • a monomer having a hydroxy group or a monomer having a carboxyl group is preferable, and a monomer having a hydroxy group and a carboxyl group are preferable in terms of the reactivity between the (meth) acrylic acid ester polymer and the cross-linking agent. It is more preferable to contain any of the monomers having a group.
  • the monomer having a hydroxy group 2-hydroxyethyl acrylate, 3-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, 5-hydroxypentyl acrylate, and 6-hydroxyhexyl acrylate are preferable. In particular, good durability can be obtained by using 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate and 5-hydroxypentyl acrylate.
  • Acrylic acid is preferably used as the monomer having a carboxyl group.
  • the (meth) acrylic resin (A) substantially contains a structural unit derived from a monomer having an amino group. It is preferable that there is no such thing.
  • substantially not contained means that the amount is 0.1 parts by mass or less out of 100 parts by mass of all the constituent units constituting the (meth) acrylic resin (a).
  • the content of the structural unit derived from the monomer having a polar functional group is preferably 20 parts by mass or less, more preferably 0, with respect to 100 parts by mass of all the structural units of the (meth) acrylic resin (A). It is 5.5 parts by mass or more and 15 parts by mass or less, more preferably 0.5 parts by mass or more and 10 parts by mass or less, and particularly preferably 1 part by mass or more and 7 parts by mass or less.
  • the content of the structural unit derived from the monomer having an aromatic group is preferably 20 parts by mass or less, more preferably 4 parts by mass, based on 100 parts by mass of all the structural units of the (meth) acrylic resin (A). 2 parts or more and 20 parts by mass or less, more preferably 4 parts by mass or more and 16 parts by mass or less.
  • Structural units derived from monomers other than the (meth) acrylate ester include structural units derived from styrene-based monomers, structural units derived from vinyl-based monomers, and a plurality of (meth) acryloyl in the molecule.
  • Structural units derived from a monomer having a group, structural units derived from a (meth) acrylamide-based monomer, and the like can also be mentioned.
  • styrene-based monomer examples include styrene; methylstyrene, dimethylstyrene, trimethylstyrene, ethylstyrene, diethylstyrene, triethylstyrene, propylstyrene, butylstyrene, hexylstyrene, heptylstyrene, octylstyrene and other alkylstyrenes; fluorostyrene, Examples thereof include halogenated styrene such as chlorostyrene, bromostyrene, dibromostyrene and iodostyrene; nitrostyrene; acetylstyrene; methoxystyrene; and divinylbenzene.
  • halogenated styrene such as chlorostyrene, bromostyrene, dibromostyren
  • vinyl-based monomer examples include fatty acid vinyl esters such as vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate and vinyl laurate; vinyl halides such as vinyl chloride and vinyl bromide; vinylidene chloride and the like.
  • vinylidene halide nitrogen-containing heteroaromatic vinyl such as vinylpyridine, vinylpyrrolidone and vinylcarbazole; conjugated diene such as butadiene, isoprene and chloroprene; and unsaturated nitriles such as acrylonitrile and methacrylonitrile.
  • Examples of the monomer having a plurality of (meth) acryloyl groups in the molecule include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and 1,9-nonanediol di ( Two (meth) acryloyl groups in a molecule such as meta) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, and tripropylene glycol di (meth) acrylate.
  • Monomer having; Examples thereof include a monomer having three (meth) acryloyl groups in the molecule such as trimethyl propantri (meth) acrylate.
  • Examples of the (meth) acrylamide-based monomer include N-methylol (meth) acrylamide, N- (2-hydroxyethyl) (meth) acrylamide, N- (3-hydroxypropyl) (meth) acrylamide, and N- (4-).
  • N- (methoxymethyl) acrylamide N- (ethoxymethyl) acrylamide, N- (propoxymethyl) acrylamide, N- (butoxymethyl) acrylamide and N- (2-methylpropoxymethyl) acrylamide are preferable.
  • the weight average molecular weight (Mw) of the (meth) acrylic resin (A) is preferably 500,000 to 2.5 million.
  • the weight average molecular weight is 500,000 or more, the durability of the pressure-sensitive adhesive layer is improved, and problems such as floating and peeling between the adherend and the pressure-sensitive adhesive layer and cohesive destruction of the pressure-sensitive adhesive layer are caused. Easy to suppress.
  • the weight average molecular weight is 2.5 million or less, it is advantageous from the viewpoint of coatability. From the viewpoint of achieving both the durability of the pressure-sensitive adhesive layer and the coatability of the pressure-sensitive adhesive composition, the weight average molecular weight is preferably 600,000 to 1.8 million, often preferably 700,000 to 1.7 million, and particularly preferably 100. It is 10,000 to 1.6 million.
  • the molecular weight distribution (Mw / Mn) represented by the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) is usually 2 to 10, preferably 3 to 8, and more preferably 3 to 6. ..
  • the weight average molecular weight can be analyzed by gel permeation chromatography and is a value in terms of standard polystyrene.
  • the viscosity at 25 ° C. is preferably 20 Pa ⁇ s or less, and 0.1 to 15 Pa ⁇ s. Is more preferable.
  • a viscosity in this range is advantageous from the viewpoint of coatability when the pressure-sensitive adhesive composition is applied to the substrate.
  • the viscosity can be measured with a Brookfield viscometer.
  • the glass transition temperature (Tg) of the (meth) acrylic resin (A) is, for example, ⁇ 60 to 20 ° C., preferably ⁇ 50 to 15 ° C., more preferably ⁇ 45 to 10 ° C., and particularly ⁇ 40 to 0 ° C. You may. When Tg is not more than the upper limit value, it is advantageous to improve the wettability of the pressure-sensitive adhesive layer with respect to the adherend base material, and when it is not more than the lower limit value, it is advantageous to improve the durability of the pressure-sensitive adhesive layer.
  • the glass transition temperature can be measured by a differential scanning calorimeter (DSC).
  • the (meth) acrylic resin (A) can be produced by a known method such as a solution polymerization method, a massive polymerization method, a suspension polymerization method, or an emulsion polymerization method, and the solution polymerization method is particularly preferable.
  • a solution polymerization method for example, a monomer and an organic solvent are mixed, a thermal polymerization initiator is added under a nitrogen atmosphere, and the temperature conditions are 40 to 90 ° C., preferably 50 to 80 ° C., 3 to 15 A method of stirring for about an hour can be mentioned.
  • a monomer or a thermal polymerization initiator may be added continuously or intermittently during the polymerization. The monomer and the heat initiator may be in a state of being added to an organic solvent.
  • the polymerization initiator a thermal polymerization initiator, a photopolymerization initiator, or the like is used.
  • the photopolymerization initiator include 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone.
  • thermal polymerization initiator examples include 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-methylbutyronitrile), 1,1'-azobis (cyclohexane-1-carbonitrile), and 2 , 2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2,4-dimethyl-4-methoxyvaleronitrile), dimethyl-2,2'-azobis (2-methylpropionate) ), 2,2'-Azobis (2-hydroxymethylpropionitrile) and other azo compounds; lauryl peroxide, t-butyl hydroperoxide, benzoyl peroxide, t-butyl peroxybenzoate, cumene hydroperoxide, Organic peroxides such as diisopropylperoxydicarbonate, dipropylperoxydicarbonate, t-butylperoxyneodecanoate, t-butylperoxypivalate, (3,5,5-
  • the ratio of the polymerization initiator is about 0.001 to 5 parts by mass with respect to 100 parts by mass of the total amount of the monomers constituting the (meth) acrylic resin (A).
  • a polymerization method using active energy rays for example, ultraviolet rays may be used.
  • Organic solvents include aromatic hydrocarbons such as toluene and xylene; esters such as ethyl acetate and butyl acetate; fatty alcohols such as propyl alcohol and isopropyl alcohol; ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone. Can be mentioned.
  • the content of the (meth) acrylic resin (A) is usually 60% by mass to 99.9% by mass, preferably 70% by mass to 99.5% by mass, based on 100% by mass of the pressure-sensitive adhesive composition. More preferably, it is 80% by mass to 99% by mass.
  • the cross-linking agent (B) reacts with polar functional groups (for example, hydroxy group, amino group, carboxyl group, heterocyclic group, etc.) in the (meth) acrylic resin (A).
  • the cross-linking agent (B) forms a cross-linked structure with a (meth) acrylic resin or the like, and forms a cross-linked structure advantageous in durability and reworkability.
  • cross-linking agent (B) examples include an isocyanate-based cross-linking agent, an epoxy-based cross-linking agent, an aziridine-based cross-linking agent, a metal chelate-based cross-linking agent, and the like, and in particular, the pot life of the pressure-sensitive adhesive composition and the durability and cross-linking of the pressure-sensitive adhesive layer. From the viewpoint of speed and the like, an isocyanate-based cross-linking agent is preferable.
  • isocyanate-based compound a compound having at least two isocyanato groups (-NCO) in the molecule is preferable, and for example, an aliphatic isocyanate-based compound (for example, hexamethylene diisocyanate) and an alicyclic isocyanate-based compound (for example, isophorone diisocyanate) are preferable.
  • an aliphatic isocyanate-based compound for example, hexamethylene diisocyanate
  • an alicyclic isocyanate-based compound for example, isophorone diisocyanate
  • Hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate), aromatic isocyanate-based compounds for example, tolylene diisocyanate, xylylene diisocyanate diphenylmethane diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, etc.
  • aromatic isocyanate-based compounds for example, tolylene diisocyanate, xylylene diisocyanate diphenylmethane diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, etc.
  • the cross-linking agent (B) is an adduct (adduct) of the isocyanate compound made of a polyhydric alcohol compound [for example, an adduct made of glycerol, trimethylolpropane, etc.], an isocyanurate, a burette-type compound, a polyether polyol, or a polyester. It may be a derivative such as a urethane prepolymer type isocyanate compound which has been subjected to an addition reaction with a polyol, an acrylic polyol, a polybutadiene polyol, a polyisoprene polyol or the like.
  • the cross-linking agent (B) can be used alone or in combination of two or more.
  • aromatic isocyanate compounds eg, tolylene diisocyanate, xylylene diisocyanate
  • aliphatic isocyanate compounds eg, hexamethylene diisocyanate
  • their polyhydric alcohol compounds eg, glycerol, trimethylolpropane.
  • isocyanurates e.g., glycerol, trimethylolpropane.
  • the cross-linking agent (B) is an aromatic isocyanate compound and / or an adduct of these polyhydric alcohol compounds or an isocyanurate compound
  • the durability of the adhesive layer can be improved.
  • an adduct made of a tolylene diisocyanate compound and / or a polyhydric alcohol compound thereof can improve durability even when, for example, an adhesive layer is applied to a polarizing plate.
  • the content of the cross-linking agent (B) is usually 0.01 to 15 parts by mass, preferably 0.05 to 10 parts by mass, based on 100 parts by mass of the (meth) acrylic resin (A). It is preferably 0.1 to 5 parts by mass.
  • the pressure-sensitive adhesive composition forming the light-selective absorbing pressure-sensitive adhesive layer of the present invention may further contain the silane compound (D).
  • the silane compound (D) include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, and 3 -Glysidoxypropylmethyldimethoxysilane, 3-glycidoxypropylethoxydimethylsilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, Examples thereof include 3-methacryloyloxypropyltrimethoxysilane and 3-mercaptopropyltrimethoxysilane.
  • 3-Acryloyloxypropyltriethoxysilane-tetraethoxysilane oligomer 3-acryloyloxypropylmethyldimethoxysilane-tetramethoxysilane oligomer, 3-acryloyloxypropylmethyldimethoxysilane-tetraethoxysilane oligomer, 3-acryloyloxypropylmethyldi Acryloyloxypropyl group-containing oligomers such as ethoxysilane-tetramethoxysilane oligomer, 3-acryloyloxypropylmethyldiethoxysilane-tetraethoxysilane oligomer; vinyltrimethoxysilane-tetramethoxysilane oligomer, vinyltrimethoxysilane-tetraethoxysilane oligomer , Vinyl Triethoxysilane-Tetramethoxysilane oligomer, Vinyltriethoxy
  • the silane compound (D) may be a silane compound represented by the following formula (d1).
  • the pressure-sensitive adhesive composition contains a silane compound represented by the following formula (d1), the adhesiveness to the substrate, glass, transparent electrode, etc. can be further improved, so that floating and foaming are less likely to occur in a high temperature environment.
  • a pressure-sensitive adhesive layer having good durability can be formed.
  • B represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and constitutes the alkanediyl group and the alicyclic hydrocarbon group.
  • -CH 2- may be substituted with -O- or -CO-
  • R d7 represents an alkyl group having 1 to 5 carbon atoms
  • R d8 , R d9 , R d10 , R d11 and R d12 respectively. Independently, it indicates an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms).
  • B is an alkandiyl group having 1 to 20 carbon atoms such as a methylene group, an ethylene group, a trimethylene group, a tetramethylene group, a hexamethylene group, a heptamethylene group and an octamethylene group; a cyclobutylene group (for example, a cyclobutylene group).
  • 1,2-Cyclobutylene group 1,2-cyclopentylene group (eg 1,2-cyclopentylene group), cyclohexylene group (eg 1,2-cyclohexylene group), cyclooctylene group (eg 1,2-cyclohexylene group)
  • a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms such as (cyclooctylene group), or an alcandiyl group thereof and -CH 2- constituting the alicyclic hydrocarbon group is -O- or Indicates a group substituted with -CO-.
  • Preferred B is an alkanediyl group having 1 to 10 carbon atoms.
  • Rd7 represents an alkyl group having 1 to 5 carbon atoms such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an s-butyl group, a t-butyl group, and a pentyl group, and R d8 , R d9 , and R d10.
  • R d11 and R d12 are each independently an alkyl group of said R 21 to the illustrated having 1-5 carbon atoms, or a methoxy group, an ethoxy group, a propoxy group, i- propoxy, butoxy, s- butoxy group, It shows an alkoxy group having 1 to 5 carbon atoms such as a t-butyloxy group.
  • Preferred R d8 , R d9 , R d10 , R d11 and R d12 are independently alkoxy groups having 1 to 5 carbon atoms, respectively.
  • These silane compounds (D) can be used alone or in combination of two or more.
  • silane compound represented by the above formula (d1) examples include (trimethoxysilyl) methane, 1,2-bis (trimethoxysilyl) ethane, 1,2-bis (triethoxysilyl) ethane, and the like.
  • (Trimethoxysilyl) hexane and 1,8-bis (trimethoxysilyl) octane are preferable.
  • the content of the silane compound (D) is usually 0.01 to 10 parts by mass, preferably 0.03 to 5 parts by mass, based on 100 parts by mass of the (meth) acrylic resin (A). It is preferably 0.05 to 2 parts by mass, and more preferably 0.1 to 1 part by mass.
  • it is advantageous to suppress bleed-out of the silane compound (A) from the pressure-sensitive adhesive layer, and when it is more than the above lower limit value, the pressure-sensitive adhesive layer is adhered to a metal layer, a glass substrate or the like. It becomes easy to improve the property (or adhesiveness), which is advantageous for improving the peeling resistance and the like.
  • the pressure-sensitive adhesive composition may further contain an antistatic agent.
  • the antistatic agent include a surfactant, a siloxane compound, a conductive polymer, an ionic compound and the like, and an ionic compound is preferable.
  • the ionic compound include conventional ones.
  • the cation component constituting the ionic compound include organic cations and inorganic cations.
  • the organic cation include pyridinium cation, pyrrolidinium cation, piperidinium cation, imidazolium cation, ammonium cation, sulfonium cation, phosphonium cation and the like.
  • the inorganic cation examples include alkali metal cations such as lithium cation, potassium cation, sodium cation and cesium cation, and alkaline earth metal cations such as magnesium cation and calcium cation.
  • alkali metal cations such as lithium cation, potassium cation, sodium cation and cesium cation
  • alkaline earth metal cations such as magnesium cation and calcium cation.
  • pyridinium cations, imidazolium cations, pyrrolidinium cations, lithium cations, and potassium cations are preferable from the viewpoint of compatibility with (meth) acrylic resins.
  • the anion component constituting the ionic compound may be either an inorganic anion or an organic anion, but an anion component containing a fluorine atom is preferable from the viewpoint of antistatic performance.
  • anion component containing a fluorine atom examples include hexafluorophosphate anion (PF 6- ), bis (trifluoromethanesulfonyl) imide anion [(CF 3 SO 2 ) 2 N-], and bis (fluorosulfonyl) imide anion [(FSO). 2 ) 2 N-], tetra (pentafluorophenyl) borate anion [(C 6 F 5 ) 4 B-] and the like.
  • PF 6- hexafluorophosphate anion
  • bis (trifluoromethanesulfonyl) imide anion (CF 3 SO 2 ) 2 N-]
  • tetra (pentafluorophenyl) borate anion [(C 6 F 5 ) 4 B-] examples of the anion component containing a fluorine atom.
  • bis (trifluoromethanesulfonyl) imide anion [(CF 3 SO 2 ) 2 N-]
  • tetra (pentafluorophenyl) borate anion [(C 6) F 5 ) 4 B-]
  • An ionic compound that is solid at room temperature is preferable in terms of stability over time in the antistatic performance of the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition.
  • the content of the antistatic agent is, for example, 0.01 to 20 parts by mass, preferably 0.1 to 10 parts by mass, and more preferably 1 to 7 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin (A). It is mass.
  • the pressure-sensitive adhesive composition can contain one or more additives such as a solvent, a cross-linking catalyst, a tack fire, a plasticizer, a softening agent, a pigment, a rust preventive, an inorganic filler, and light-scattering fine particles.
  • additives such as a solvent, a cross-linking catalyst, a tack fire, a plasticizer, a softening agent, a pigment, a rust preventive, an inorganic filler, and light-scattering fine particles.
  • the optical laminate of the present invention may further include a retardation layer laminated on the opposite side of the light selective absorbing pressure-sensitive adhesive layer to the polarizer.
  • the retardation layer may be one layer or two or more layers.
  • the optical laminate 200 shown in FIG. 2 includes a first retardation layer 30 and a second retardation layer 31.
  • the retardation layer is an optical film that exhibits optical anisotropy.
  • the optical film exhibiting optical anisotropy include polyvinyl alcohol, polycarbonate, polyester, polyarylate, polyimide, polyolefin, polycycloolefin, polystyrene, polysulfone, polyether sulfone, polyvinylidene fluoride / polymethylmethacrylate, and acetyl.
  • Examples thereof include a stretched film obtained by stretching a polymer film made of cellulose, an ethylene-vinyl acetate copolymer saponified product, polyvinyl chloride, etc. about 1.01 to 6 times.
  • the retardation layer may be a retardation layer made of a cured product of the polymerizable liquid crystal compound, which exhibits optical anisotropy by coating and orienting the polymerizable liquid crystal compound on a base material.
  • the retardation layer includes a retardation layer having zero retardation, and also includes a film called a uniaxial retardation film, a low photoelastic modulus retardation film, a wide viewing angle retardation film, and the like. ..
  • the zero retardation retardation layer is an optically isotropic film in which both the front retardation Re and the thickness direction retardation Rth are -15 to 15 nm.
  • the zero retardation film include a resin film made of a cellulose resin, a polyolefin resin (chain polyolefin resin, polycycloolefin resin, etc.) or a polyethylene terephthalate resin, and the retardation value can be easily controlled and can be obtained.
  • a cellulose-based resin or a polyolefin-based resin is preferable because it is easy.
  • the zero retardation film can also be used as a protective film.
  • Zero retardation films include "Z-TAC” (trade name) sold by FUJIFILM Corporation, "Zero Tuck (registered trademark)” sold by Konica Minolta Opto Co., Ltd., and Zeon Corporation. Examples include “ZF-14" (trade name) sold by.
  • the retardation layer is preferably a retardation layer which is a cured product of a polymerizable liquid crystal compound.
  • the retardation layer which is a cured product of the polymerizable liquid crystal compound, include the first form to the fifth form.
  • First form a retardation layer in which the rod-shaped liquid crystal compound is oriented horizontally with respect to the supporting base material
  • Second form a retardation layer in which the rod-shaped liquid crystal compound is oriented in the direction perpendicular to the supporting base material
  • Third form A retardation layer in which the direction of orientation of the rod-shaped liquid crystal compound changes spirally in the plane
  • Fourth form A retardation layer in which the disk-shaped liquid crystal compound is obliquely oriented
  • Fifth form The disk-shaped liquid crystal compound Biaxial retardation layer oriented perpendicular to the supporting substrate
  • the first form, the second form, and the fifth form are preferably used. Be done.
  • the retardation layers of these forms may be laminated and used.
  • the retardation layer When the retardation layer is a layer made of a polymer in the oriented state of the polymerizable liquid crystal compound (hereinafter, may be referred to as an “optical anisotropic layer”), the retardation layer may have anti-wavelength dispersibility. preferable.
  • the inverse wavelength dispersibility is an optical characteristic in which the in-plane retardation value of the liquid crystal alignment at a short wavelength is smaller than the in-plane retardation value of the liquid crystal alignment at a long wavelength. (7) and equation (8) are satisfied.
  • Re ( ⁇ ) represents an in-plane retardation value with respect to light having a wavelength of ⁇ nm.
  • the retardation layer has the first form and anti-wavelength dispersibility
  • Examples thereof include the above-mentioned polymerizable liquid crystal compounds.
  • Examples of the method for producing the retardation layer from the polymer in the oriented state of the polymerizable liquid crystal compound include the methods described in JP-A-2010-31223.
  • the thickness of the retardation layer which is a liquid crystal cured layer obtained by curing a polymerizable liquid crystal compound, is, for example, 0.1 ⁇ m or more and 10 ⁇ m or less, preferably 0.5 ⁇ m or more and 8 ⁇ m or less, and more preferably 1 ⁇ m or more and 6 ⁇ m or less. is there.
  • a retardation layer that develops optical anisotropy by coating and orientation of a liquid crystal compound and a retardation layer that develops optical anisotropy by coating an inorganic layered compound are called temperature-compensated retardation films.
  • VAC film "(trade name; biaxially oriented film) and the like can be mentioned.
  • the retardation layer is a ⁇ / 4 retardation layer that imparts a phase difference of 1/4 wavelength to transmitted light, a ⁇ / 2 retardation layer that imparts a phase difference of 1/2 wavelength to transmitted light, and a positive A plate. , And can be a positive C plate.
  • the combination of the first retardation layer 30 and the second retardation layer 31 is the ⁇ / 2 position. Examples thereof include a combination of a retardation layer and a ⁇ / 4 retardation layer, a combination of a ⁇ / 4 retardation layer and a positive C layer, and the like.
  • the optical laminate of the present invention may be configured as a circularly polarizing plate having a ⁇ / 4 retardation layer.
  • the circular polarizing plate can be used as an antireflection polarizing plate.
  • the optical laminate of the present invention can include a laminating layer for joining the two layers.
  • the bonding layer include an adhesive layer and a pressure-sensitive adhesive layer (hereinafter, also referred to as “second pressure-sensitive adhesive layer”).
  • the optical laminate 200 shown in FIG. 2 has an adhesive layer 33 that is interposed between the first retardation layer 30 and the second retardation layer 31 and joins them, and an adhesive layer of the second retardation layer 31. It includes a second pressure-sensitive adhesive layer 32 laminated on the surface opposite to 33.
  • the adhesive layer a water-based adhesive, an active energy ray-curable adhesive, a thermosetting adhesive, or the like is used.
  • the thickness of the adhesive layer is, for example, 10 nm or more and 20 ⁇ m or less, preferably 100 nm or more and 10 ⁇ m or less, and more preferably 500 nm or more and 5 ⁇ m or less.
  • the second pressure-sensitive adhesive layer may be composed of the same pressure-sensitive adhesive composition as the pressure-sensitive adhesive composition forming the above-mentioned light-selective absorbing pressure-sensitive adhesive layer, and may be composed of (meth) acrylic-based, rubber-based, urethane-based, or the like. It may be composed of a pressure-sensitive adhesive composition (hereinafter, also referred to as “second pressure-sensitive adhesive composition”) containing a resin as a main component, such as an ester-based, a silicone-based, or a polyvinyl ether-based resin.
  • a pressure-sensitive adhesive composition using a (meth) acrylic resin having excellent transparency, weather resistance, heat resistance and the like as a base polymer is suitable.
  • the second pressure-sensitive adhesive composition may be an active energy ray-curable type or a thermosetting type.
  • the thickness of the second pressure-sensitive adhesive layer is, for example, 0.1 to 150 ⁇ m, usually 8 to 60 ⁇ m, and is preferably 30 ⁇ m or less, more preferably 20 ⁇ m or less in terms of thinning.
  • the optical laminates 100 and 200 can be manufactured by a method including a step of laminating layers constituting the laminate 100 via a laminating layer.
  • a surface activation treatment such as a corona treatment on one or both of the bonding surfaces in order to improve the adhesion.
  • the optical laminate of the present invention has a planar shape, and its area is, for example, 30 mm ⁇ 30 mm to 180 mm ⁇ 90 mm.
  • the optical laminate of the present invention may be a rectangle such as a rectangle or a square, a shape having a notch portion in which a part of the side constituting the rectangle is cut out, a semicircular shape, or a through hole in the plane. It may be a so-called irregular shape such as a shape having.
  • the absorption axis of the polarizer constituting the optical laminate may be parallel to the side, orthogonal to the side, or diagonally, for example. They may intersect at an angle of 45 °.
  • the slow-phase axis and the absorption axis of the polarizer constituting the optical laminate intersect at 45 °. It may intersect at 15 °, or at 75 °.
  • the optical laminates 100 and 200 are arranged on the front surface (visual side) of the image display panel and can be used as a component of the image display device.
  • the optical laminate which is a circularly polarizing plate, can also be used as an antireflection polarizing plate that imparts an antireflection function in an image display device.
  • the image display device is not particularly limited, and examples thereof include an image display device such as an organic electroluminescence (organic EL) display device, an inorganic electroluminescence (inorganic EL) display device, a liquid crystal display device, and an electric field emission display device.
  • aqueous boric acid solution 1 containing 5.5 parts by weight of boric acid and 15 parts by weight of potassium iodide per 100 parts by weight of water at 64 ° C. for 110 seconds.
  • boric acid aqueous solution 2 containing 5.5 parts by weight of boric acid and 15 parts by weight of potassium iodide per 100 parts by weight of water at 67 ° C. for 30 seconds.
  • the thickness of the obtained polarizer was 8 ⁇ m, and the boron content was 4.3% by weight.
  • the protective film A a film having a hard coat layer having a thickness of 3 ⁇ m formed on a stretched film made of a norbornene resin having a thickness of 25 ⁇ m (manufactured by Nippon Paper Industries, Ltd., trade name “COP25ST-HC”) was used.
  • the protective film B a triacetyl cellulose film having a thickness of 20 ⁇ m [trade name “ZRG20SL” manufactured by Fuji Film Co., Ltd.] was used.
  • the release film B a triacetyl cellulose film (manufactured by FUJIFILM Corporation, "TD80UL”) was used. The thickness of the release film was 80 ⁇ m, and the moisture permeability was 502 g / m 2.24 hr.
  • the produced polarizer was continuously conveyed, the protective film A was continuously unwound from the roll of the protective film A, and the release film B was continuously unwound from the roll of the release film B.
  • a water-based adhesive is injected between the polarizer and the corona-treated protective film A, and pure water is injected between the polarizer and the release film B, and the film is passed through a bonding roll to adhere the protective film A / water-based adhesive.
  • a laminated film composed of an agent / polarizer / pure water / release film B was obtained. The laminated film is transported and heat-treated at 80 ° C.
  • a single-sided protective polarizing plate with a release film was obtained.
  • the release film B was peeled from the single-sided protective polarizing plate with a release film to obtain a single-sided protective polarizing plate.
  • First liquid crystal cured layer As the first liquid crystal cured layer (first retardation layer), a layer formed by curing a nematic liquid crystal compound, an alignment film, and a transparent substrate, which gives a phase difference of ⁇ / 4, was used. The total thickness of the cured layer and the oriented layer of the nematic liquid crystal compound was 2 ⁇ m.
  • composition for forming an oriented layer 10.0 parts by mass of polyethylene glycol di (meth) acrylate (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., A-600) and trimethylolpropan triacrylate (manufactured by Shin-Nakamura Chemical Industry Co., Ltd.) 10.0 parts by mass of A-TMPT) and 10.0 parts by mass of 1,6-hexanediol di (meth) acrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., A-HD-N), and Irgacure as a photopolymerization initiator. 1.50 parts by mass of 907 (Irg-907, manufactured by BASF) was dissolved in 70.0 parts by mass of the solvent methyl ethyl ketone to prepare a coating liquid for forming an orientation layer.
  • 907 Irg-907, manufactured by BASF
  • a long cyclic olefin resin (COP) film (manufactured by Nippon Zeon Corporation) with a thickness of 20 ⁇ m is prepared as a base film, and a coating liquid for forming an alignment layer is applied to one side of the base film with a bar coater. did.
  • COP cyclic olefin resin
  • the coating layer after coating is heat-treated at a temperature of 80 ° C. for 60 seconds, it is irradiated with ultraviolet rays (UVB) at 220 mJ / cm 2 to polymerize and cure the composition for forming an orientation layer to form a base film.
  • UVB ultraviolet rays
  • a photopolymerizable nematic liquid crystal compound (RMM28B, manufactured by Merck) as a composition for forming a retardation layer
  • 1.0 mass by Irgacure 907 (Irg-907, manufactured by BASF) as a photopolymerization initiator.
  • the parts were dissolved in 80.0 parts by mass of the solvent propylene glycol monomethyl ether acetate to prepare a coating liquid for forming a retardation layer.
  • a coating liquid for forming a retardation layer was applied onto the previously obtained alignment layer, and the coating layer was heat-treated at a temperature of 80 ° C. for 60 seconds. Then, it was irradiated with ultraviolet rays (UVB) at 220 mJ / cm 2 to polymerize and cure the composition for forming a retardation layer to form a retardation layer having a thickness of 0.7 ⁇ m on the alignment layer. In this way, a second liquid crystal cured layer (second retardation layer) having a thickness of 3 ⁇ m composed of an alignment layer and a retardation layer was obtained on the base film.
  • UVB ultraviolet rays
  • the first liquid crystal layer and the second liquid crystal layer were bonded to each other with an ultraviolet curable adhesive (thickness 1 ⁇ m) so that the respective liquid crystal layer surfaces (the surface opposite to the base film) were bonded surfaces.
  • the ultraviolet curable adhesive was cured by irradiating with ultraviolet rays to prepare a retardation laminate including two retardation layers, a first liquid crystal curing layer and a second liquid crystal curing layer.
  • the thickness of the retardation laminate including the first liquid crystal cured layer, the ultraviolet curable adhesive layer, and the second liquid crystal cured layer was 6 ⁇ m.
  • the obtained mixture was held at 60 ° C. for 1 hour, and then ethyl acetate was continuously added into the reaction vessel at an addition rate of 17.3 parts / hr while maintaining the internal temperature at 50 to 70 ° C. to increase the concentration of the acrylic resin.
  • concentration reached 35%
  • the addition of ethyl acetate was stopped, and the temperature was kept at this temperature until 12 hours had passed from the start of the addition of ethyl acetate.
  • ethyl acetate was added to adjust the concentration of the acrylic resin to 20%, and an ethyl acetate solution of the acrylic resin was prepared.
  • the obtained acrylic resin had a polystyrene-equivalent weight average molecular weight Mw of 600,000 and Mw / Mn of 7.0 by GPC. This is referred to as an acrylic resin (A-1).
  • the glass transition temperature by DSC was ⁇ 52.9 ° C.
  • the blending amount of the cross-linking agent (Coronate L) is the number of parts by mass as the active ingredient.
  • the pressure-sensitive adhesive composition (1) prepared above is dried on the release-treated surface of the polyethylene terephthalate film (SP-PLR382050 manufactured by Lintec Corporation, hereinafter abbreviated as "separator") that has been subjected to the release treatment.
  • the pressure-sensitive adhesive layer was applied using an applicator so that the thickness of the pressure-sensitive adhesive layer was 17 ⁇ m, and dried at 100 ° C. for 1 minute to prepare a pressure-sensitive adhesive layer.
  • the obtained pressure-sensitive adhesive layer was designated as a pressure-sensitive adhesive layer (1).
  • Table 1 shows the content of the light selective absorber per unit area of the pressure-sensitive adhesive layer (1).
  • the pressure-sensitive adhesive layer (2) was prepared by the same method as that of the pressure-sensitive adhesive layer (1), except that the amount of the light selective absorber was 2.5 parts and the thickness of the pressure-sensitive adhesive layer after drying was 5 ⁇ m. ) was prepared. Table 1 shows the content of the light selective absorber per unit area of the pressure-sensitive adhesive layer (2).
  • the pressure-sensitive adhesive layer (3) was prepared by the same method as that of the pressure-sensitive adhesive layer (1), except that the amount of the light selective absorber was 3.7 parts and the thickness of the pressure-sensitive adhesive layer after drying was 5 ⁇ m. ) was prepared. Table 1 shows the content of the light selective absorber per unit area of the pressure-sensitive adhesive layer (3).
  • the pressure-sensitive adhesive layer (4) was prepared by the same method as that of the pressure-sensitive adhesive layer (1), except that the amount of the light selective absorber was 2.5 parts and the thickness of the pressure-sensitive adhesive layer after drying was 17 ⁇ m. ) was prepared. Table 1 shows the content of the light selective absorber per unit area of the pressure-sensitive adhesive layer (4).
  • the pressure-sensitive adhesive layer (5) was prepared by the same method as the pressure-sensitive adhesive layer (1) except that the amount of the light selective absorber was 3.7 parts and the thickness of the pressure-sensitive adhesive layer after drying was 17 ⁇ m. ) was prepared. Table 1 shows the content of the light selective absorber per unit area of the pressure-sensitive adhesive layer (5).
  • the pressure-sensitive adhesive layer (6) was prepared by the same method as that of the pressure-sensitive adhesive layer (1), except that the amount of the light selective absorber was 5.4 parts and the thickness of the pressure-sensitive adhesive layer after drying was 17 ⁇ m. ) was prepared. Table 1 shows the content of the light selective absorber per unit area of the pressure-sensitive adhesive layer (6).
  • the pressure-sensitive adhesive layer (7) was prepared by the same method as that of the pressure-sensitive adhesive layer (1), except that the amount of the light selective absorber was 2.9 parts and the thickness of the pressure-sensitive adhesive layer after drying was 17 ⁇ m. ) was prepared. Table 1 shows the content of the light selective absorber per unit area of the pressure-sensitive adhesive layer (7).
  • a cross-linking agent (Coronate L, solid content 75%: manufactured by Tosoh) and a silane compound (manufactured by Shin-Etsu Chemical Industry: KBM-) in an ethyl acetate solution (resin concentration: 20%) of the above acrylic resin (A-1). 403) 0.5 parts were mixed, and 2-butanone was further added so that the solid content concentration became 14% to obtain a pressure-sensitive adhesive composition.
  • the blending amount of the cross-linking agent (Coronate L) is the number of parts by mass as the active ingredient.
  • the pressure-sensitive adhesive composition was applied to the release-treated surface of the separator used for producing the light-selective absorbing pressure-sensitive adhesive layer using an applicator so that the thickness of the pressure-sensitive adhesive layer after drying was 15 ⁇ m or 25 ⁇ m.
  • a second pressure-sensitive adhesive layer was prepared by drying at ° C. for 1 minute.
  • Example 1 The pressure-sensitive adhesive layer (2) was attached to the polarizer side of the prepared single-sided protective polarizing plate, and the separator was peeled off. The surface from which the separator of the pressure-sensitive adhesive layer (2) was peeled off was bonded to the first liquid crystal cured layer side of the produced retardation laminate, and the base film of the second liquid crystal cured layer was peeled off. A second pressure-sensitive adhesive layer with a separator having the thickness shown in Table 1 was attached to the surface from which the base film was peeled off.
  • the optical laminate of Example 1 had a configuration as shown in FIG.
  • Examples 2 and 3 and Comparative Examples 1 and 2 By the same method as the optical laminate of Example 1, the pressure-sensitive adhesive layer shown in Table 1 is used instead of the pressure-sensitive adhesive layer (2) of Example 1, and the second pressure-sensitive adhesive with a separator having the thickness shown in Table 1 is used. Using the agent layer, optical laminates of Examples 2 and 3 and Comparative Examples 1 and 2 were prepared, respectively. The optical laminates of Examples 2 and 3 and Comparative Examples 1 and 2 had a configuration as shown in FIG.
  • Example 4 The pressure-sensitive adhesive layer (4) was attached to the polarizer side of the produced single-sided polarizing plate, and the separator was peeled off to obtain an optical laminate of Example 4.
  • the optical laminate of Example 4 had a configuration as shown in FIG.
  • Example 5 and Comparative Example 3 By the same method of the optical laminate of Example 4, the pressure-sensitive adhesive layer shown in Table 1 is used instead of the pressure-sensitive adhesive layer (4) of Example 4, and the second with a separator having the thickness shown in Table 1 is used. Using the pressure-sensitive adhesive layer, the optical laminates of Example 5 and Comparative Example 3 were prepared, respectively. The optical laminates of Example 5 and Comparative Example 3 had a configuration as shown in FIG.
  • the pressure-sensitive adhesive layer (7) is bonded to the glass from the pressure-sensitive adhesive layer (1), the separator is peeled off, and then a cycloolefin polymer (COP) film (ZF-14 manufactured by Nippon Zeon Corporation) is attached to the pressure-sensitive adhesive layer. Then, a laminate for evaluating the pressure-sensitive adhesive layer was prepared.
  • the laminate for evaluating the pressure-sensitive adhesive layer was set on a spectrophotometer UV-2450 (manufactured by Shimadzu Corporation), and the absorbance was measured in the wavelength range of 300 to 800 nm in 1 nm steps by the double beam method. Table 1 shows the absorbance of the prepared pressure-sensitive adhesive layer at a wavelength of 410 nm.
  • the absorbance of the glass and the absorbance of the COP film at a wavelength of 410 nm are both 0.
  • the weight average molecular weight (Mw) of the acrylic resin (A-1) was determined by the following size exclusion chromatography (SEC) using tetrahydrofuran as the mobile phase as the polystyrene-equivalent number average molecular weight (Mn).
  • SEC size exclusion chromatography
  • the (meth) acrylic polymer to be measured was dissolved in tetrahydrofuran at a concentration of about 0.05% by mass, and 10 ⁇ L was injected into SEC.
  • the mobile phase was flowed at a flow rate of 1.0 mL / min.
  • PLgel MIXED-B manufactured by Polymer Laboratories
  • a UV-VIS detector (trade name: Agilent GPC) was used as the detector.
  • FIG. 4 shows an example of the converted data.
  • the midpoint between the color loss region 51 and the non-color loss region 52 (middle of the color loss gradation) in the gradation profile in the direction perpendicular to the end 50 of the optical laminate (arrow in FIG. 3) is the color loss of the optical laminate.
  • FIG. 4 shows an example of the converted data.
  • the distance ( ⁇ m) from the end portion 50 of the optical laminate to the color loss end portion was measured as the color loss distance.
  • Table 1 shows the color loss distance of the optical laminate. The smaller the color loss distance, the narrower the color loss range and the better the moisture resistance and heat resistance.
  • Polarizer 10 Polarizer, 11 Protective film, 20 Light selective absorption adhesive layer, 30 First retardation layer, 31 Second retardation layer, 32 Second adhesive layer, 33 Adhesive layer, 50 Edge of optical laminate , 51 color loss area, 52 non-color loss area, 100, 200 optical laminate, 300 retardation laminate.

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  • Adhesives Or Adhesive Processes (AREA)

Abstract

Le problème décrit par la présente invention est de fournir un nouveau corps multicouche optique dont la décoloration est supprimée au niveau d'une partie d'extrémité d'un polariseur dans des conditions de température élevée et d'humidité élevée. La solution selon l'invention porte sur un corps multicouche optique qui comprend un polariseur et une couche adhésive absorbant sélectivement la lumière qui est empilée sur le polariseur, de l'iode étant adsorbé et orienté sur le polariseur ; le polariseur a une teneur en bore inférieure ou égale à 5,0 % en masse ; et la couche adhésive absorbant sélectivement la lumière est formée à partir d'une composition adhésive qui contient un absorbant de lumière sélectif, tout en ayant une absorbance de 0,1 à 1,6 à la longueur d'onde de 410 nm.
PCT/JP2020/044452 2019-12-23 2020-11-30 Corps multicouche optique et dispositif d'affichage d'image WO2021131504A1 (fr)

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CN202080088943.8A CN114846374A (zh) 2019-12-23 2020-11-30 光学层叠体及图像显示装置

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JP2013148806A (ja) * 2012-01-23 2013-08-01 Sumitomo Chemical Co Ltd 偏光フィルムとその製造方法及び偏光板
JP2019008295A (ja) * 2017-06-27 2019-01-17 住友化学株式会社 光学フィルム
JP2019007002A (ja) * 2017-06-27 2019-01-17 住友化学株式会社 粘着剤組成物及び粘着剤層付フィルム

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JP5322280B2 (ja) 2009-03-27 2013-10-23 サイデン化学株式会社 光学用粘着剤組成物
JP5985813B2 (ja) 2011-11-14 2016-09-06 日東電工株式会社 偏光子の製造方法、偏光子、偏光板、光学フィルムおよび画像表示装置
KR20170077817A (ko) * 2015-12-28 2017-07-06 스미또모 가가꾸 가부시끼가이샤 광학 적층체
JP2018025765A (ja) * 2016-07-29 2018-02-15 住友化学株式会社 光学積層体

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Publication number Priority date Publication date Assignee Title
JP2013148806A (ja) * 2012-01-23 2013-08-01 Sumitomo Chemical Co Ltd 偏光フィルムとその製造方法及び偏光板
JP2019008295A (ja) * 2017-06-27 2019-01-17 住友化学株式会社 光学フィルム
JP2019007002A (ja) * 2017-06-27 2019-01-17 住友化学株式会社 粘着剤組成物及び粘着剤層付フィルム

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