WO2023163146A1 - Film adhésif pour dispositif d'affichage à delo - Google Patents

Film adhésif pour dispositif d'affichage à delo Download PDF

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Publication number
WO2023163146A1
WO2023163146A1 PCT/JP2023/006938 JP2023006938W WO2023163146A1 WO 2023163146 A1 WO2023163146 A1 WO 2023163146A1 JP 2023006938 W JP2023006938 W JP 2023006938W WO 2023163146 A1 WO2023163146 A1 WO 2023163146A1
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Prior art keywords
layer
meth
weight
adhesive layer
less
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PCT/JP2023/006938
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English (en)
Japanese (ja)
Inventor
昌邦 藤田
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日東電工株式会社
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Publication of WO2023163146A1 publication Critical patent/WO2023163146A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal 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
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/842—Containers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • 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
    • H10K59/10—OLED displays

Definitions

  • the present invention relates to an adhesive film for OLED display devices. More particularly, it relates to an adhesive film used in an OLED display that does not use polarizing plates.
  • OLED Organic light emitting diode
  • display performance advantages such as high visibility, low viewing angle dependency, and fast response speed compared to liquid crystal display devices.
  • OLED display device does not use a backlight, it is advantageous for thinning, and can be used as a foldable device that can be flexibly curved or folded.
  • An OLED display device usually has an OLED element in which an anode, an OLED layer including a light-emitting layer, and a cathode are laminated in this order.
  • the electrode (anode or cathode) of the OLED element is made of a transparent conductive material with a high refractive index such as ITO or a metal material with a high reflectance. A glare problem may occur, degrading the display performance of the OLED display device.
  • a circularly polarizing plate also has a function of blocking ultraviolet rays contained in external light and preventing deterioration of the OLED element due to ultraviolet rays.
  • the mechanical properties of the circularly polarizing plate itself it also has the function of absorbing external shocks and preventing damage to the OLED display device.
  • the efficiency of light utilization (that is, the lighting rate) is poor due to absorption by the polarizing plate, resulting in low luminance. If the emission intensity of the OLED element is increased to obtain desired luminance, the power consumption increases and the life of the OLED element is shortened.
  • the polarizing plate has a thickness of about 0.15 mm including an adhesive layer for attachment, which is disadvantageous in reducing the thickness of the OLED display device. Furthermore, since the circularly polarizing plate is expensive, there is also the problem that the manufacturing cost is high.
  • a color filter is placed on the viewing side of the OLED element, and alignment is performed so that the color filter of the same color as the emitted color of the OLED layer faces each other, thereby preventing external light reflection.
  • a method for improving the luminous intensity of an OLED element has been proposed (for example, Patent Document 2).
  • OLED display device having a microcavity also called multiple reflection interference, optical resonator or microresonator
  • the spectrum of the light extracted to the outside becomes steep and high intensity, so it is said that the luminance and color purity can be improved (for example, Patent Document 3).
  • various optical element layers such as an adhesive layer, a base material such as plastic or thin glass, and a hard coat layer are laminated in order to provide functions such as surface protection and flexibility on the viewing side of the OLED element. It is
  • an object of the present invention is to provide an adhesive film that can impart high weather resistance to OLED display devices that do not use polarizing plates.
  • an adhesive film for an OLED display device having at least one layer containing an ultraviolet absorber and having a 380 nm transmittance adjusted to a specific range was used.
  • the inventors have found that an OLED display device exhibits sufficient weather resistance even if the OLED display device does not use a polarizing plate, and have completed the present invention.
  • an adhesive film used in an OLED display device in which only an optical element having a degree of polarization of 95% or less is laminated on the viewing side of the OLED element, wherein the layer constituting the optical element contains an ultraviolet absorber.
  • an adhesive film for an OLED display device which has at least one layer containing the above and has a 380 nm transmittance of 20% or less.
  • the adhesive film of the present invention can impart high weather resistance to OLED display devices that do not use polarizing plates.
  • FIG. 1 is a schematic cross-sectional view showing an embodiment of an OLED display panel used in the OLED display device of the present invention
  • FIG. 1 is a schematic cross-sectional view showing an embodiment of an OLED display device laminated with the optical laminate of the present invention.
  • FIG. 1 is a schematic cross-sectional view showing an embodiment of an OLED display device laminated with the optical laminate of the present invention.
  • FIG. 1 is a schematic cross-sectional view showing an embodiment of an OLED display device laminated with the optical laminate of the present invention.
  • FIG. 1 is a schematic cross-sectional view showing an embodiment of an OLED display device laminated with the optical laminate of the present invention.
  • FIG. 1 is a schematic cross-sectional view showing an embodiment of an OLED display device laminated with the optical laminate of the present invention.
  • FIG. 1 is a schematic cross-sectional view showing an embodiment of an OLED display device laminated with the optical laminate of the present invention.
  • FIG. 1 is a schematic cross-sectional view showing an embodiment of an OLED display device laminated with the optical laminate of the present invention.
  • FIG. (a) It is a schematic sectional drawing which shows one Embodiment of the adhesion film of this invention.
  • (b) It is a schematic cross-sectional view showing one embodiment of an OLED display device using the pressure-sensitive adhesive film of the present invention.
  • the present invention provides an adhesive film for OLED display devices.
  • the pressure-sensitive adhesive film for an OLED display device of the present invention is referred to as the "adhesive film of the present invention”
  • the optical layered body for an OLED display device of the present invention is referred to as the "optical layered body of the present invention”
  • an OLED display using the optical layered body of the present invention The device may be referred to as “the OLED display device of the present invention”
  • the optical element constituting the optical laminate of the present invention may be referred to as the "optical element of the present invention”.
  • the optical layered product of the present invention is a layered product obtained by removing the OLED display panel from the OLED display device of the present invention, and includes the adhesive film of the present invention.
  • the OLED display device of the present invention only an optical element having a degree of polarization of 95% or less is laminated on the OLED display panel on the viewing side of the OLED element.
  • "Only an optical element with a degree of polarization of 95% or less is laminated on the viewing side of the OLED element” means that the optical element on the viewing side of the OLED element does not include an optical element with a degree of polarization exceeding 95%. do.
  • the "optical element having a degree of polarization exceeding 95%” is not particularly limited, but includes polarizing plates such as linear polarizing plates, 1/4 retardation plates, 1/2 retardation plates, circular polarizing plates, and reflective polarizing plates. included. That is, the OLED display device of the present invention is an OLED display device that does not include a polarizing plate on the viewing side of the OLED element.
  • the degree of polarization is obtained by the following formula based on the parallel transmittance Tp and the orthogonal transmittance Tc, which are measured using an ultraviolet-visible spectrophotometer and subjected to visibility correction.
  • Degree of polarization (%) ⁇ (Tp-Tc)/(Tp+Tc) ⁇ 1/2 x 100
  • the OLED display device of the present invention does not include a polarizing plate on the visible side of the OLED element, the absorption of light emitted from the OLED element by the polarizing plate is suppressed, the lighting rate is improved, and power consumption can be saved, and the OLED This leads to longer life of the element.
  • the polarizing plate since the polarizing plate is not used, the thickness can be reduced, and the manufacturing cost can be reduced.
  • the adhesive film of the present invention is characterized by having at least one layer containing an ultraviolet absorber and having a 380 nm transmittance of 20% or less. It is preferable that the pressure-sensitive adhesive film of the present invention has the above-mentioned characteristics, in terms of improving the weather resistance of the OLED display device.
  • the adhesive layer may be a layer containing an ultraviolet absorber. That is, it may have an adhesive layer containing an ultraviolet absorber.
  • the pressure-sensitive adhesive film of the present invention may have a resin layer in addition to the pressure-sensitive adhesive layer, and the resin layer may be a layer containing an ultraviolet absorber.
  • the pressure-sensitive adhesive film of the present invention has a resin layer, it is preferable from the viewpoint of improving impact resistance.
  • the pressure-sensitive adhesive film of the present invention may have an optical element other than the pressure-sensitive adhesive layer and the resin layer laminated on the OLED display device of the present invention as a structure of the pressure-sensitive adhesive film.
  • At least one of the pressure-sensitive adhesive layers of the present invention may be a high-refractive pressure-sensitive adhesive layer, and all the pressure-sensitive adhesive layers of the present invention may have a high refractive index. It may be a refractive index adhesive layer.
  • the adhesive film of the present invention preferably has an adhesive layer containing an ultraviolet absorber and a resin layer containing an ultraviolet absorber in order to further improve weather resistance.
  • the amount of the ultraviolet absorber required for each layer is small, which is also preferable in that there is a low possibility that the originally required properties of the layer will be impaired.
  • the 380 nm transmittance of the adhesive film of the present invention is preferably 15% or less, more preferably 10% or less, more preferably 7% or less, more preferably 5% or less, more preferably 4% or less, more preferably It is 3% or less, more preferably 2% or less, and particularly preferably 1% or less.
  • the lower limit of 380 nm transmittance is 0%.
  • the method for measuring the 380 nm transmittance is not particularly limited, for example, it can be measured by using a spectrophotometer U4100 (manufactured by Hitachi High Technology Co., Ltd.).
  • adheresive film includes the meanings of "adhesive sheet” and "adhesive tape”. That is, the adhesive film of the present invention may be an adhesive sheet or adhesive tape having a sheet-like or tape-like form.
  • the pressure-sensitive adhesive film of the present invention is an element for forming the optical laminate of the present invention, and contains at least the high-refractive-index pressure-sensitive adhesive layer.
  • the adhesive film of the present invention may be a so-called "substrate-less type” adhesive film that does not have a substrate (corresponding to the "resin layer” described later), or a type of adhesive film that has a substrate.
  • the "substrate-less type” adhesive film may be referred to as “substrate-less adhesive film”
  • the type adhesive film having a substrate may be referred to as “substrate-attached adhesive film”.
  • the substrate-less pressure-sensitive adhesive film include a double-sided pressure-sensitive adhesive sheet consisting of only a pressure-sensitive adhesive layer.
  • Examples of the adhesive film with a substrate include a single-sided adhesive film having an adhesive layer on one side of the substrate and a double-sided adhesive film having an adhesive layer on both sides of the substrate.
  • substrate means a support, and when the adhesive film of the present invention is used (attached) to an adherend, it is the part that is attached to the adherend together with the adhesive layer. be. A release liner that is peeled off when the adhesive film is used (attached) is not included in the base material.
  • the OLED display panel used in the OLED display device of the present invention includes, as essential components, an OLED element in which an anode, an OLED layer including a light-emitting layer, and a cathode are laminated in this order.
  • the optical laminate of the present invention is laminated on the viewing side of the OLED element of the OLED display panel.
  • FIG. 1 is a schematic cross-sectional view showing one embodiment of an OLED display panel.
  • the OLED display panel 100 includes a transparent electrode 11a, a red OLED layer 10R that emits red light, a red OLED element 12R in which a back electrode 11b is laminated in this order, the transparent electrode 11a, and a green light.
  • element 12B OLED elements 12R, 12G, and 12B of respective multiple colors are arranged on substrate 13 in order.
  • a TFT (Thin Film Transistor) layer 14 is formed on the surface of the substrate 13 on which the OLED elements are arranged, and is connected to the back electrodes 11b of the OLED elements 12R, 12G, and 12B of the plurality of colors.
  • a color filter 15 is arranged on the visible side (upper side in FIG. 1) of each of the OLED elements 12R, 12G, and 12B of multiple colors.
  • the color filter 15 includes a red colored layer 15R, a green colored layer 15G, and a blue colored layer 15B.
  • a black matrix layer 16 is provided between the colored layers.
  • the color filter 15 is arranged such that the red colored layer 15R, the green colored layer 15G, and the blue colored layer 15B face the red OLED element 12R, the green OLED element 12G, and the blue OLED element 12B, respectively. It is
  • the transparent electrode 11a is either a cathode or an anode, but is generally provided as a cathode.
  • Transparent conductive materials such as ITO (indium tin oxide), indium oxide, IZO (indium zinc oxide), SnO 2 and ZnO are used as materials for forming the transparent electrode 11a.
  • the back electrode 11b functions as a counter electrode for the transparent electrode 11a.
  • a back electrode 11b which is either an anode or a cathode, is generally provided on the substrate 13 as an anode.
  • Examples of the forming material include metals such as gold, silver, and chromium. Therefore, the back electrode 11b can reflect light.
  • a bonding layer 17 is provided between the substrate 13 and the color filter 15 .
  • the bonding layer 17 has translucency.
  • a material used in a general OLED display device may be used.
  • a photocurable resin such as a photosensitive polyimide resin, or a thermosetting resin may be used.
  • OLED display panel 100 has, in addition to the configuration shown in FIG. (not shown).
  • a feature of the OLED display panel of FIG. 1 is that color filters 15 are placed on the OLED elements 12R, 12G, and 12B of a plurality of colors so that the colored layers 15R, 15G, and 15B of the same color face each other. It is arranged.
  • external light W which is white, passes through, for example, a red colored layer 15R, passes through a transparent electrode 11a and a red OLED layer 10R that emits red light, and reaches a rear electrode 11b. After being reflected, the reflected light G again passes through the red OLED layer 10R, the transparent electrode 11a, and the red colored layer 15R and enters the observer's eyes.
  • the green and blue colors of the external light W are absorbed by the red colored layer 15R, so the light intensity is reduced to 1/3.
  • the reflected light G passes through the red colored layer 15R and the red OLED layer 10R again, it is attenuated.
  • the reflected light G has a red color
  • the red light emitted from the OLED layer 10R can be enhanced.
  • green light and blue light can be enhanced, respectively. Therefore, by using a color filter together with the OLED display panel, even if a polarizing plate is not used for antireflection, it is possible to greatly suppress the reflection of external light and improve the luminous intensity of the OLED element.
  • color filters are generally prone to uneven interference due to their regular two-dimensional structure.
  • the color filter has a problem that reflection is likely to occur at the interface, and the efficiency of receiving light from the OLED element is lowered.
  • the color filter does not have sufficient ultraviolet absorption function compared to the case of using a polarizing plate, and there is a problem that the OLED element is easily deteriorated over time by the ultraviolet rays contained in the external light (that is, the weather resistance is low). be.
  • the color filter has a problem that the impact absorption function is not sufficient as compared with the case of using the polarizing plate.
  • the OLED display panel 100 of this embodiment has a microcavity structure.
  • Light emitted from the OLED layers 10R, 10G, and 10B passes through the transparent electrode 11a and is emitted to the outside.
  • the emitted light includes "direct light” directly emitted from the OLED layers 10R, 10G, and 10B toward the transparent electrode 11a, and emitted light from the OLED layers 10R, 10G, and 10B toward the back electrode 11b. Both components of the "reflected light” that travels toward the transparent electrode 11a after being reflected by the electrode 11b are included.
  • a second optical path C2 is formed through the OLED layers 10R, 10G, 10B and the transparent electrode 11a, and emitted to the outside.By interference between the direct light and the reflected light, each color corresponds to the light
  • the thicknesses of the OLED layers 10R, 10G, 10B are different so that the light components are constructive, i.e., the back electrode (positive electrode) 11b and the transparent electrode 11b are different in the respective red, green and blue EL spectral peak wavelengths.
  • the thicknesses of the OLED layers 10R, 10G, and 10B are made different so as to match the optical path length with the electrode (negative electrode) 11a and extract the strongest light from each color.
  • the thickness of the blue OLED layer 10B of the wavelength is designed to be thin, and the thickness of the red OLED layer 10R of the long wavelength is designed to be thick.
  • the light generated in the OLED layer is repeatedly reflected between the positive electrode and the negative electrode.
  • the spectrum of the light extracted to the outside becomes steep and high intensity, and the brightness and color purity are improved. improves.
  • the viewing angle is strongly dependent (the viewing angle is narrow) due to the steep spectrum. can occur. For this reason, when an image is viewed from an oblique direction during image display, a color shift may occur in which the color appears to be different from the color originally desired to be displayed.
  • the optical element of the present invention is an optical element laminated on the viewing side of an OLED display device, and includes at least an adhesive layer.
  • the optical element of the present invention is further selected from an adhesive layer, a resin layer, a glass layer, a hard coat layer, an antireflection layer, an antiglare layer, an intermediate layer (compatible layer), an impact absorption layer, an antistatic layer, and the like. It may contain at least one layer.
  • the optical elements of the present invention do not include those having a degree of polarization exceeding 95%, such as polarizing plates.
  • the adhesive layer is a layer that has adhesiveness at room temperature and adheres to the adherend with light pressure. It refers to the one that maintains a good adhesive strength.
  • the pressure-sensitive adhesive layer constituting the optical element of the present invention prevents interface reflection and improves the lighting rate of light emitted from the OLED element. , preferably have a high refractive index.
  • the refractive index of the pressure-sensitive adhesive layer of the present invention is preferably 1.57 or higher, more preferably 1.575 or higher, still more preferably 1.580 or higher, particularly preferably 1.585 or higher, and still more preferably 1.590. or more, and may be 1.595 or more.
  • the refractive index of the pressure-sensitive adhesive layer of the present invention can be adjusted by the types and contents of aromatic ring-containing monomers, high refractive index organic materials, and high refractive inorganic materials, which will be described later.
  • the pressure-sensitive adhesive layer of the present invention is not particularly limited, it preferably has light scattering properties (light scattering function) from the viewpoint of efficiently reducing color shift and interference unevenness in OLED display devices.
  • the pressure-sensitive adhesive layer of the present invention preferably contains light-scattering fine particles dispersed in the pressure-sensitive adhesive layer.
  • the OLED display device of the present invention includes a color filter on the viewing side and the adhesive layer has light scattering properties, the color shift and interference unevenness of the OLED display device are reduced, and the OLED display device caused by light scattering is reduced.
  • the distance between the pressure-sensitive adhesive layer having light scattering properties and the color filter is 700 ⁇ m or less.
  • the distance between the pressure-sensitive adhesive layer having light scattering properties and the color filter is more preferably 600 ⁇ m or less, more preferably 500 ⁇ m or less. is more preferable, and it is most preferable that the pressure-sensitive adhesive layer having a light scattering property and the color filter are in direct contact with each other.
  • the distance between the pressure-sensitive adhesive layer having light scattering properties and the color filter is the distance ( ⁇ m) between the surface of the pressure-sensitive adhesive layer facing the color filter and the surface of the color filter facing the pressure-sensitive adhesive layer. If another layer is laminated between the pressure-sensitive adhesive layer having light scattering properties and the color filter, the thickness ( ⁇ m) of the other layer (in the case of two or more layers, the total) corresponds to
  • the haze value of the pressure-sensitive adhesive layer of the present invention is not particularly limited, it is preferably 20% or more, more preferably 30% or more, and still more preferably 40% from the viewpoint of efficiently reducing color shift and interference unevenness of an OLED display device. % or more, particularly preferably 50% or more.
  • the haze value of the pressure-sensitive adhesive layer of the present invention is preferably 90% or less, more preferably 80% or less, and 70% or less. more preferred.
  • the total light transmittance of the pressure-sensitive adhesive layer of the present invention is not particularly limited, it is preferably 60% or more, more preferably 70% or more, and still more preferably 80% or more from the viewpoint of ensuring the brightness of the OLED display device. Especially preferably, it is 90% or more.
  • the upper limit of the total light transmittance of the pressure-sensitive adhesive layer of the present invention is not particularly limited, but may be less than 100%, 99.9% or less, or 99% or less.
  • the haze value and total light transmittance of the pressure-sensitive adhesive layer of the present invention can be measured by methods defined in JIS K7136 and JIS K7361, respectively. It can be controlled by adjusting the content and the blending amount.
  • the thickness of the pressure-sensitive adhesive layer of the present invention is preferably 10 to 100 ⁇ m, more preferably 15 to 90 ⁇ m, more preferably 20 to 80 ⁇ m, from the viewpoint of efficiently reducing color shift and interference unevenness of an OLED display device. and more preferably 25 to 70 ⁇ m.
  • the light-scattering fine particles have an appropriate refractive index difference with the adhesive layer (adhesive in the adhesive layer) and impart light scattering properties to the adhesive layer.
  • the pressure-sensitive adhesive layer contains light-scattering fine particles, light-scattering performance is imparted, which is preferable.
  • Examples of light-scattering fine particles include inorganic fine particles and polymer fine particles.
  • Examples of materials for the inorganic fine particles include silica, calcium carbonate, aluminum hydroxide, magnesium hydroxide, clay, talc, and titanium dioxide.
  • Examples of materials for the polymer fine particles include silicone resins, acrylic resins, methacrylic resins (eg, polymethyl methacrylate), polystyrene resins, polyurethane resins, melamine resins, polyethylene resins, and epoxy resins.
  • the light-scattering microparticles are preferably polymer microparticles, and in particular, microparticles composed of silicone resin (e.g., Tospearl series manufactured by Momentive Performance Materials Japan Co., Ltd.) have excellent dispersion in the pressure-sensitive adhesive layer.
  • the shape of the light-scattering fine particles can be spherical, flat, or irregular, for example.
  • the light-scattering fine particles may be used alone or in combination of two or more.
  • the volume average particle diameter of the light-scattering fine particles is preferably 0.1 ⁇ m or more, more preferably 0.15 ⁇ m or more, still more preferably 0.2 ⁇ m or more, from the viewpoint of imparting appropriate light scattering properties to the pressure-sensitive adhesive layer. Especially preferably, it is 0.25 ⁇ m or more.
  • the volume average particle diameter of the light-scattering fine particles is preferably 12 ⁇ m or less, more preferably 10 ⁇ m or less, and even more preferably 10 ⁇ m or less, from the viewpoint of preventing the haze value from becoming too high and displaying high-definition images. 8 ⁇ m or less.
  • the volume average particle size can be measured using, for example, a Coulter counter.
  • the refractive index of the light-scattering fine particles is preferably 1.2-5, more preferably 1.25-4.5, and may be 1.3-4, or 1.35-3.
  • the absolute value of the refractive index difference between the light-scattering fine particles and the adhesive in the adhesive layer effectively reduces the color shift and interference unevenness of the OLED display device. From the viewpoint of reducing to There may be.
  • the absolute value of the refractive index difference between the light-scattering fine particles and the pressure-sensitive adhesive is preferably 5 or less from the viewpoint of preventing the haze value from becoming too high, suppressing image blur, and displaying high-definition images. , more preferably 4 or less, and still more preferably 3 or less.
  • the content of the light-scattering fine particles in the adhesive layer is preferably 0.01 per 100 parts by weight of the adhesive constituting the adhesive layer. It is at least 0.05 part by weight, more preferably at least 0.1 part by weight, and particularly preferably at least 0.15 part by weight.
  • the content of the light-scattering fine particles is 100 parts by weight of the adhesive constituting the adhesive layer from the viewpoint of preventing the haze value from becoming too high, suppressing image blurring, and displaying high-definition images. On the other hand, it is preferably 80 parts by weight or less, more preferably 70 parts by weight or less.
  • the variation ratio of the refractive index of the pressure-sensitive adhesive layer of the present invention before and after humidification is not particularly limited. From the viewpoint, it is preferably 0.05 or less, preferably 0.04 or less, more preferably 0.02 or less, and particularly preferably 0.01 or less.
  • the variation ratio of the refractive index of the pressure-sensitive adhesive layer of the present invention before and after humidification can be calculated from the following formula after storing the pressure-sensitive adhesive layer of the present invention in a humidified environment at a temperature of 85° C. and a relative humidity of 85% for 120 hours. is.
  • Refractive index change ratio before and after humidification
  • the variation ratio of the refractive index before and after humidification depends on the type and content of the aromatic ring-containing monomer, high refractive index organic material, and high refractive inorganic material described later, the type of adhesive constituting the adhesive layer, the monomer composition, the degree of cross-linking, The thickness can be adjusted.
  • the adhesive constituting the adhesive layer of the present invention is not particularly limited, but for example, acrylic adhesive, rubber adhesive, vinyl alkyl ether adhesive, silicone adhesive, polyester adhesive, polyamide adhesive Adhesives, urethane-based adhesives, fluorine-based adhesives, epoxy-based adhesives, and the like can be used.
  • acrylic pressure-sensitive adhesives are preferable as the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer from the viewpoints of transparency, adhesiveness, weather resistance, cost, and ease of designing the pressure-sensitive adhesive.
  • the pressure-sensitive adhesive layer of the present invention is preferably an acrylic pressure-sensitive adhesive layer composed of an acrylic pressure-sensitive adhesive.
  • the said adhesive can be used individually or in combination of 2 or more types.
  • the acrylic pressure-sensitive adhesive layer contains an acrylic polymer as a base polymer.
  • the acrylic polymer is a polymer containing an acrylic monomer (a monomer having a (meth)acryloyl group in the molecule) as a monomer component constituting the polymer.
  • the acrylic polymer is preferably a polymer containing a (meth)acrylic acid alkyl ester as a monomer component constituting the polymer.
  • an acrylic polymer can be used individually or in combination of 2 or more types.
  • the adhesive composition forming the adhesive layer of the present invention may be in any form.
  • the pressure-sensitive adhesive composition may be an emulsion type, a solvent type (solution type), an active energy ray-curable type, a heat-melting type (hot-melt type), or the like.
  • solvent-type and active energy ray-curable pressure-sensitive adhesive compositions are preferable from the viewpoint of productivity and the ease with which a pressure-sensitive adhesive layer having excellent optical properties and appearance can be obtained.
  • the pressure-sensitive adhesive layer of the present invention is an acrylic pressure-sensitive adhesive layer containing an acrylic polymer as a base polymer, and is preferably formed from a solvent-type or active energy ray-curable acrylic pressure-sensitive adhesive composition.
  • the active energy rays include ionizing radiation such as ⁇ -rays, ⁇ -rays, ⁇ -rays, neutron beams and electron beams, and ultraviolet rays, with ultraviolet rays being particularly preferred. That is, the active energy ray-curable pressure-sensitive adhesive composition is preferably an ultraviolet-curable pressure-sensitive adhesive composition.
  • acrylic pressure-sensitive adhesive compositions containing a mixture of monomers sometimes referred to as a "monomer mixture" or a partial polymer thereof as an essential component.
  • the former includes, for example, a so-called solvent-type acrylic pressure-sensitive adhesive composition.
  • the latter includes, for example, so-called active energy ray-curable acrylic pressure-sensitive adhesive compositions.
  • the "monomer mixture” means a mixture containing monomer components that constitute a polymer.
  • the "partially polymerized product” may also be referred to as a "prepolymer", and means a composition in which one or more of the monomer components in the monomer mixture is partially polymerized. do.
  • the acrylic polymer is a polymer composed (formed) of an acrylic monomer as an essential monomer component (monomer component).
  • the acrylic polymer is preferably a polymer composed (formed) of a (meth)acrylic acid alkyl ester as an essential monomer component. That is, the acrylic polymer preferably contains a (meth)acrylic acid alkyl ester as a structural unit.
  • “(meth)acryl” represents “acryl” and/or "methacryl” (either or both of "acryl” and “methacryl"), and so on.
  • the said acrylic polymer is comprised by 1 type, or 2 or more types of monomer components.
  • (meth)acrylic acid alkyl ester as an essential monomer component, a (meth)acrylic acid alkyl ester having a linear or branched alkyl group is preferably mentioned.
  • (meth)acrylic-acid alkylester can be used individually or in combination of 2 or more types.
  • the (meth)acrylic acid alkyl ester having a linear or branched alkyl group is not particularly limited, but examples include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, ( meth)isopropyl acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylate, (meth)acrylate isopentyl acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, nonyl (meth)acrylate, (meth)acrylate ) isononyl acrylate, decyl (me
  • the (meth)acrylic acid alkyl ester having a linear or branched alkyl group is preferably a (meth)acrylic acid alkyl ester having a linear or branched alkyl group having 4 to 18 carbon atoms. , and more preferably 2-ethylhexyl acrylate (2EHA) and isostearyl acrylate (ISTA).
  • the (meth)acrylic acid alkyl esters having a linear or branched alkyl group can be used alone or in combination of two or more.
  • the ratio of the (meth)acrylic acid alkyl ester in the total monomer components (100% by weight) constituting the acrylic polymer is not particularly limited, but is 50% by weight or more (for example, 50 to 100% by weight). is preferred, more preferably 53 to 90% by weight, and even more preferably 55 to 85% by weight.
  • the acrylic polymer may contain a copolymerizable monomer together with the (meth)acrylic acid alkyl ester as a monomer component constituting the polymer. That is, the acrylic polymer may contain a copolymerizable monomer as a structural unit.
  • a copolymerizable monomer can be used individually or in combination of 2 or more types.
  • the copolymerizable monomer is not particularly limited. is preferably a monomer having an aromatic ring. That is, the acrylic polymer preferably contains a monomer having an aromatic ring in the molecule as a structural unit.
  • the monomer having an aromatic ring in its molecule is a monomer (monomer) having at least one aromatic ring in its molecule (within one molecule).
  • monomer having an aromatic ring in the molecule may be referred to as "aromatic ring-containing monomer”.
  • a compound containing at least one aromatic ring and at least one ethylenically unsaturated group in one molecule is used as the aromatic ring-containing monomer.
  • aromatic ring-containing monomer such compounds can be used singly or in combination of two or more.
  • Examples of the ethylenically unsaturated groups include (meth)acryloyl groups, vinyl groups, and (meth)allyl groups.
  • a (meth)acryloyl group is preferable from the viewpoint of polymerization reactivity, and an acryloyl group is more preferable from the viewpoint of flexibility and adhesiveness.
  • the aromatic ring-containing monomer a compound having one ethylenically unsaturated group contained in one molecule (that is, a monofunctional monomer) is preferably used.
  • the number of aromatic rings contained in one molecule of the compound used as the aromatic ring-containing monomer may be one, or two or more.
  • the upper limit of the number of aromatic rings contained in the aromatic ring-containing monomer is not particularly limited, and may be, for example, 16 or less.
  • the number of the aromatic rings may be, for example, 12 or less, preferably 8 or less, more preferably 6 or less, and 5 It may be less than or equal to 4, less than or equal to 3, or less than or equal to 2.
  • the aromatic ring possessed by the compound used as the aromatic ring-containing monomer is, for example, a benzene ring (which may be a benzene ring constituting part of a biphenyl structure or a fluorene structure); naphthalene ring, indene ring, azulene ring, anthracene ring, phenanthrene It may be a carbocyclic ring such as a condensed ring, such as a pyridine ring, a pyrimidine ring, a pyridazine ring, a pyrazine ring, a triazine ring, a pyrrole ring, a pyrazole ring, an imidazole ring, a triazole ring, an oxazole ring, an isoxazole ring, and a thiazole ring.
  • a condensed ring such as a pyridine ring, a
  • the heterocyclic ring such as a ring or a thiophene ring.
  • the heteroatoms included as ring-constituting atoms in the heterocyclic ring may be one or more selected from the group consisting of nitrogen, sulfur and oxygen, for example.
  • the heteroatoms that make up the heterocycle may be one or both of nitrogen and sulfur.
  • the aromatic ring-containing monomer may have a structure in which one or more carbon rings and one or more heterocycles are condensed, such as a dinaphthothiophene structure.
  • the aromatic ring may or may not have one or more substituents on the ring-constituting atoms.
  • the substituent includes an alkyl group, an alkoxy group, an aryloxy group, a hydroxyl group, a halogen atom (fluorine atom, chlorine atom, bromine atom, etc.), a hydroxyalkyl group, a hydroxyalkyloxy group, and a glycidyloxy group. etc. are exemplified, but not limited to these.
  • substituents containing carbon atoms the number of carbon atoms contained in the substituent is preferably 1-4, more preferably 1-3, and can be, for example, 1 or 2.
  • the aromatic ring is an aromatic ring having no substituents on ring-constituting atoms or having one or more substituents selected from the group consisting of alkyl groups, alkoxy groups and halogen atoms (e.g., bromine atoms). obtain.
  • the expression that the aromatic ring of the aromatic ring-containing monomer has a substituent on its ring-constituting atom means that the aromatic ring has a substituent other than a substituent having an ethylenically unsaturated group.
  • the aromatic ring and the ethylenically unsaturated group may be directly bonded or may be bonded via a linking group.
  • the linking group is, for example, an alkylene group, an oxyalkylene group, a poly(oxyalkylene) group, a phenyl group, an alkylphenyl group, an alkoxyphenyl group, or a structure in which one or more hydrogen atoms in these groups are substituted with hydroxyl groups. (eg, hydroxyalkylene group), oxy group (--O-- group), thiooxy group (--S-- group) and the like.
  • Ring-containing monomers may preferably be employed.
  • the number of carbon atoms in the alkylene group and the oxyalkylene group is preferably 1-4, more preferably 1-3, and may be 1 or 2, for example.
  • the number of repeating oxyalkylene units in the poly(oxyalkylene) group may be, for example, 2-3.
  • Examples of compounds that can be preferably employed as aromatic ring-containing monomers include aromatic ring-containing (meth)acrylates and aromatic ring-containing vinyl compounds.
  • the aromatic ring-containing (meth)acrylate and the aromatic ring-containing vinyl compound can be used singly or in combination of two or more.
  • One or two or more aromatic ring-containing (meth)acrylates and one or two or more aromatic ring-containing vinyl compounds may be used in combination.
  • the proportion of the aromatic ring-containing monomer in the total monomer components (100% by weight) constituting the acrylic polymer is although not particularly limited, it is preferably 30% by weight or more, more preferably 50% by weight or more, still more preferably 60% by weight or more, and may be 70% by weight or more. When the ratio is 30% by weight or more, a higher refractive index tends to be obtained, which is preferable.
  • the content of the aromatic ring-containing monomer may be, for example, more than 70% by weight, may be 75% by weight or more, may be 80% by weight or more, or may be 85% by weight or more. Well, it may be 90% by weight or more, or 95% by weight or more.
  • the upper limit of the ratio of the aromatic ring-containing monomer is preferably 99% by weight or less, more preferably 98% by weight, from the viewpoint of obtaining a pressure-sensitive adhesive layer having appropriate flexibility and obtaining a pressure-sensitive adhesive layer with excellent transparency. %, more preferably 97% by weight or less, and may be 96% by weight or less.
  • the content of the aromatic ring-containing monomer may be 93% by weight or less, 90% by weight or less, 80% by weight or less, or 75% by weight or less. In some embodiments where adhesive properties and/or optical properties are more important, the content of the aromatic ring-containing monomer may be 70% by weight or less, 60% by weight or less, or 45% by weight or less.
  • aromatic ring-containing monomer a monomer having two or more aromatic rings (preferably carbocyclic rings) in one molecule can be preferably used because it is easy to obtain a high effect of increasing the refractive index.
  • monomers having two or more aromatic rings in one molecule include monomers having a structure in which two or more non-condensed aromatic rings are bonded via a linking group.
  • a monomer having a structure in which two or more non-condensed aromatic rings are directly (that is, not via other atoms) chemically bonded a monomer having a condensed aromatic ring structure, a monomer having a fluorene structure, a monomer having a dinaphthothiophene structure , a monomer having a dibenzothiophene structure, and the like.
  • the monomers containing multiple aromatic rings may be used singly or in combination of two or more.
  • the linking group is, for example, an oxy group (--O--), a thiooxy group (--S--), an oxyalkylene group (eg a --O--(CH 2 ) n --- group, where n is 1 to 3, preferably 1).
  • a thiooxyalkylene group e.g., a -S-(CH 2 ) n - group, where n is 1 to 3, preferably 1)
  • a linear alkylene group i.e., a -(CH 2 ) n - group, where n is 1 to 6, preferably 1 to 3
  • the alkylene group in the oxyalkylene group, the thiooxyalkylene group and the linear alkylene group may be a partially or completely halogenated group.
  • Preferred examples of the linking group include an oxy group, a thiooxy group, an oxyalkylene group and a linear alkylene group from the viewpoint of the flexibility of the adhesive.
  • monomers having a structure in which two or more non-fused aromatic rings are bonded via a linking group include phenoxybenzyl (meth)acrylate (e.g., m-phenoxybenzyl (meth)acrylate), thiophenoxybenzyl (meth) Acrylate, benzylbenzyl (meth)acrylate and the like.
  • the monomer having a structure in which two or more non-fused aromatic rings are directly chemically bonded may be, for example, a biphenyl structure-containing (meth)acrylate, a triphenyl structure-containing (meth)acrylate, a vinyl group-containing biphenyl, or the like. Specific examples include o-phenylphenol (meth)acrylate and biphenylmethyl (meth)acrylate.
  • Examples of monomers having a condensed aromatic ring structure include naphthalene ring-containing (meth)acrylates, anthracene ring-containing (meth)acrylates, vinyl group-containing naphthalenes, and vinyl group-containing anthracenes.
  • Specific examples include 1-naphthylmethyl (meth)acrylate (also known as 1-naphthalenemethyl (meth)acrylate), hydroxyethylated ⁇ -naphthol acrylate, 2-naphthoethyl (meth)acrylate, 2-naphthoxyethyl acrylate, 2 -(4-methoxy-1-naphthoxy)ethyl (meth)acrylate and the like.
  • the monomer having a fluorene structure examples include 9,9-bis(4-hydroxyphenyl)fluorene (meth)acrylate and 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene (meth)acrylate. etc. Since the monomer having a fluorene structure includes a structural portion in which two benzene rings are directly chemically bonded, it is included in the concept of a monomer having a structure in which two or more non-fused aromatic rings are directly chemically bonded.
  • Examples of the monomer having a dinaphthothiophene structure include (meth)acryloyl group-containing dinaphthothiophene, vinyl group-containing dinaphthothiophene, and (meth)allyl group-containing dinaphthothiophene.
  • Specific examples include (meth)acryloyloxymethyldinaphthothiophene (for example, a compound having a structure in which CH 2 CH(R 1 )C(O)OCH 2 — is bonded to the 5- or 6-position of the dinaphthothiophene ring.
  • R 1 is a hydrogen atom or a methyl group
  • (meth)acryloyloxyethyl dinaphthothiophene for example, at the 5- or 6-position of the dinaphthothiophene ring, CH 2 CH(R 1 )C(O) OCH(CH 3 )— or a compound having a structure in which CH 2 CH(R 1 )C(O)OCH 2 CH 2 — is bonded, where R 1 is a hydrogen atom or a methyl group), vinyldinaphthothiophene (For example, compounds having a structure in which a vinyl group is bonded to the 5th or 6th position of the naphthothiophene ring), (meth)allyloxydinaphthothiophene, and the like.
  • the monomer having a dinaphthothiophene structure is included in the concept of the monomer having a condensed aromatic ring structure by including a naphthalene structure and by having a structure in which a thiophene ring and two naphthalene structures are condensed. be.
  • Examples of the monomer having a dibenzothiophene structure include (meth)acryloyl group-containing dibenzothiophene and vinyl group-containing dibenzothiophene.
  • a monomer having a dibenzothiophene structure is included in the concept of a monomer having a condensed aromatic ring structure because it has a structure in which a thiophene ring and two benzene rings are condensed. Neither the dinaphthothiophene structure nor the dibenzothiophene structure corresponds to structures in which two or more non-fused aromatic rings are directly chemically bonded.
  • a monomer having one aromatic ring (preferably a carbocyclic ring) in one molecule may be used as the aromatic ring-containing monomer.
  • a monomer having one aromatic ring in one molecule can be useful, for example, in improving the flexibility of the pressure-sensitive adhesive, adjusting the pressure-sensitive adhesive properties, improving the transparency, and the like.
  • a monomer having one aromatic ring in one molecule is preferably used in combination with a monomer containing multiple aromatic rings from the viewpoint of improving the refractive index of the pressure-sensitive adhesive.
  • Examples of monomers having one aromatic ring in one molecule include benzyl (meth)acrylate, methoxybenzyl (meth)acrylate, phenyl (meth)acrylate, ethoxylated phenol (meth)acrylate, phenoxypropyl (meth)acrylate 2-(4, 6-dibromo-2-s-butylphenoxy)ethyl (meth)acrylate, 2-(4,6-dibromo-2-isopropylphenoxy)ethyl (meth)acrylate, 6-(4,6-dibromo-2-s- Butylphenoxy)hexyl (meth)acrylate, 6-(4,6-dibromo-2-isopropylphenoxy)hexyl (meth)acrylate, 2,6-dibromo-4-nonylphenyl acrylate, 2,6-dibromo-4-dodecyl Bromine-substituted aromatic ring-containing (meth)acryl
  • aromatic ring-containing monomer a monomer having a structure in which an oxyethylene chain is interposed between the ethylenically unsaturated group and the aromatic ring in various aromatic ring-containing monomers as described above may be used.
  • a monomer with an oxyethylene chain interposed between the ethylenically unsaturated group and the aromatic ring can be understood as an ethoxylated product of the original monomer.
  • the number of repeating oxyethylene units ( --CH.sub.2CH.sub.2O-- ) in the oxyethylene chain is typically 1-4, preferably 1-3, more preferably 1-2, for example 1.
  • ethoxylated aromatic ring-containing monomers include ethoxylated o-phenylphenol (meth)acrylate, ethoxylated nonylphenol (meth)acrylate, ethoxylated cresol (meth)acrylate, phenoxyethyl (meth)acrylate, and phenoxydiethylene glycol. di(meth)acrylate and the like.
  • the content of the monomer containing multiple aromatic rings in the aromatic ring-containing monomer is not particularly limited, and may be, for example, 5% by weight or more, 25% by weight or more, or 40% by weight or more. From the viewpoint of easily realizing a pressure-sensitive adhesive having a higher refractive index, the content of the monomer containing multiple aromatic rings in the aromatic ring-containing monomer may be, for example, 50% by weight or more, preferably 70% by weight or more. , 85% by weight or more, 90% by weight or more, or 95% by weight or more. Substantially 100% by weight of the aromatic ring-containing monomer may be the multiple aromatic ring-containing monomer.
  • the aromatic ring-containing monomer may be used as the aromatic ring-containing monomer.
  • the content of the monomer containing multiple aromatic rings in the aromatic ring-containing monomer may be less than 100% by weight, or 98% by weight. 90% by weight or less, 80% by weight or less, or 65% by weight or less.
  • the content of the monomer containing multiple aromatic rings in the aromatic ring-containing monomer may be 70% by weight or less, 50% by weight or less, 25% by weight or less, or 10% by weight. % or less.
  • a mode in which the content of the monomer containing multiple aromatic rings in the monomer containing aromatic rings is less than 5% by weight can also be carried out.
  • a monomer containing multiple aromatic rings may not be used.
  • the proportion of the monomer containing multiple aromatic rings in the total monomer components (100% by weight) constituting the acrylic polymer. is not particularly limited, but is preferably 3% by weight or more, more preferably 10% by weight or more, and still more preferably 25% by weight or more.
  • the ratio is 3% by weight or more, a higher refractive index tends to be obtained, which is preferable.
  • the content of the monomer containing multiple aromatic rings may be, for example, more than 35% by weight, may be 50% by weight or more, may be 70% by weight or more, or may be 75% by weight or more.
  • the upper limit of the ratio of the monomer containing multiple aromatic rings is preferably 99% by weight or less, more preferably 98% by weight or less, from the viewpoint of achieving a good balance between a high refractive index and adhesive properties and/or optical properties. , more preferably 96% by weight or less, may be 93% by weight or less, may be 90% by weight or less, may be 85% by weight or less, or may be 80% by weight or less , 75% by weight or less.
  • the content of the monomer containing multiple aromatic rings may be 70% by weight or less, 50% by weight or less, 25% by weight or less, or 15% by weight or less. Well, it may be 5% by weight or less.
  • the copolymerizable monomer is not particularly limited, but from the viewpoint of suppressing cloudiness and improving durability in a high-humidity environment, compatibility with various additives such as ultraviolet absorbers, and transparency, A monomer having a nitrogen atom and a monomer having a hydroxyl group in the molecule are preferred. That is, the acrylic polymer preferably contains a monomer having a nitrogen atom in the molecule as a structural unit. Moreover, the acrylic polymer preferably contains a monomer having a hydroxyl group in the molecule as a structural unit.
  • the monomer having a nitrogen atom in its molecule is a monomer (monomer) having at least one nitrogen atom in its molecule (within one molecule).
  • the "monomer having a nitrogen atom in the molecule” may be referred to as a "nitrogen atom-containing monomer”.
  • the nitrogen atom-containing monomer is not particularly limited, but preferably includes a cyclic nitrogen-containing monomer, (meth)acrylamides, and the like. Incidentally, the nitrogen atom-containing monomers can be used alone or in combination of two or more.
  • the cyclic nitrogen-containing monomer is not particularly limited as long as it has a polymerizable functional group having an unsaturated double bond such as a (meth)acryloyl group or vinyl group and has a cyclic nitrogen structure.
  • the cyclic nitrogen structure preferably has a nitrogen atom in the cyclic structure.
  • cyclic nitrogen-containing monomers examples include N-vinyl cyclic amides (lactam-based vinyl monomers) and vinyl-based monomers having a nitrogen-containing heterocycle.
  • N-vinyl cyclic amides examples include N-vinyl cyclic amides represented by the following formula (1).
  • R 1 represents a divalent organic group
  • R 1 in the formula (1) is a divalent organic group, preferably a divalent saturated hydrocarbon group or an unsaturated hydrocarbon group, more preferably a divalent saturated hydrocarbon group (e.g., carbon number 3 to 5 alkylene groups, etc.).
  • N-vinyl cyclic amide represented by the formula (1) examples include N-vinyl-2-pyrrolidone, N-vinyl-2-piperidone, N-vinyl-3-morpholinone and N-vinyl-2-caprolactam. , N-vinyl-1,3-oxazin-2-one, N-vinyl-3,5-morpholinedione, and the like.
  • vinyl monomers having a nitrogen-containing heterocyclic ring examples include acrylic monomers having a nitrogen-containing heterocyclic ring such as a morpholine ring, a piperidine ring, a pyrrolidine ring, and a piperazine ring.
  • the vinyl-based monomer having a nitrogen-containing heterocycle is not particularly limited, but examples include (meth)acryloylmorpholine, N-vinylpiperazine, N-vinylpyrrole, N-vinylimidazole, N-vinylpyrazine, and N-vinylmorpholine.
  • acrylic monomers having a nitrogen-containing heterocycle are preferable, and (meth)acryloylmorpholine, (meth)acryloylpyrrolidine, and (meth)acryloylpiperidine are more preferable.
  • Examples of the (meth)acrylamides include (meth)acrylamide, N-alkyl(meth)acrylamide, and N,N-dialkyl(meth)acrylamide.
  • Examples of the N-alkyl(meth)acrylamide include N-ethyl(meth)acrylamide, N-isopropyl(meth)acrylamide, Nn-butyl(meth)acrylamide, N-octyl(meth)acrylamide and the like. .
  • N-alkyl(meth)acrylamides also include (meth)acrylamides having an amino group such as dimethylaminoethyl(meth)acrylamide, diethylaminoethyl(meth)acrylamide, and dimethylaminopropyl(meth)acrylamide.
  • N,N-dialkyl(meth)acrylamide examples include N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N,N-dipropyl(meth)acrylamide, N,N-diisopropyl (Meth)acrylamide, N,N-di(n-butyl)(meth)acrylamide, N,N-di(t-butyl)(meth)acrylamide and the like.
  • the (meth)acrylamides also include, for example, various N-hydroxyalkyl(meth)acrylamides.
  • N-hydroxyalkyl(meth)acrylamide examples include N-methylol(meth)acrylamide, N-(2-hydroxyethyl)(meth)acrylamide, N-(2-hydroxypropyl)(meth)acrylamide, N- (1-hydroxypropyl)(meth)acrylamide, N-(3-hydroxypropyl)(meth)acrylamide, N-(2-hydroxybutyl)(meth)acrylamide, N-(3-hydroxybutyl)(meth)acrylamide, N-(4-hydroxybutyl)(meth)acrylamide, N-methyl-N-2-hydroxyethyl(meth)acrylamide and the like.
  • the (meth)acrylamides also include, for example, various N-alkoxyalkyl(meth)acrylamides.
  • Examples of the N-alkoxyalkyl(meth)acrylamides include N-methoxymethyl(meth)acrylamide and N-butoxymethyl(meth)acrylamide.
  • nitrogen atom-containing monomers other than the cyclic nitrogen-containing monomers and the (meth)acrylamides include amino group-containing monomers, cyano group-containing monomers, imide group-containing monomers, and isocyanate group-containing monomers.
  • the amino group-containing monomer include aminoethyl (meth)acrylate, dimethylaminoethyl (meth)acrylate, dimethylaminopropyl (meth)acrylate, and t-butylaminoethyl (meth)acrylate.
  • the cyano group-containing monomer include acrylonitrile and methacrylonitrile.
  • imide group-containing monomer examples include maleimide-based monomers (eg, N-cyclohexylmaleimide, N-isopropylmaleimide, N-laurylmaleimide, N-phenylmaleimide, etc.), itaconimide-based monomers (eg, N-methylitaconimide, N- ethylitaconimide, N-butylitaconimide, N-octylitaconimide, N-2-ethylhexylitaconimide, N-laurylitaconimide, N-cyclohexylitaconimide, etc.), succinimide-based monomers (e.g., N-(meth)acryloyl oxymethylenesuccinimide, N-(meth)acryloyl-6-oxyhexamethylenesuccinimide, N-(meth)acryloyl-8-oxyoctamethylenesuccinimide, etc.).
  • the nitrogen atom-containing monomer is preferably a cyclic nitrogen-containing monomer, and more preferably an N-vinyl cyclic amide. More specifically, N-vinyl-2-pyrrolidone (NVP) is particularly preferred.
  • the ratio of the nitrogen atom-containing monomer in the total monomer components (100% by weight) constituting the acrylic polymer is although not particularly limited, it is preferably 1% by weight or more, more preferably 3% by weight or more, and even more preferably 5% by weight or more.
  • the ratio is 1% by weight or more, suppression of cloudiness and durability in a high-humidity environment can be further improved, which is preferable.
  • the upper limit of the ratio of the nitrogen atom-containing monomer is preferably 30% by weight or less, more preferably 25% by weight, from the viewpoint of obtaining a pressure-sensitive adhesive layer having appropriate flexibility and obtaining a pressure-sensitive adhesive layer with excellent transparency. % or less, more preferably 20 wt % or less.
  • the monomer having a hydroxyl group in the molecule is a monomer having at least one hydroxyl group (hydroxyl group) in the molecule (in one molecule), and has an unsaturated double bond such as a (meth)acryloyl group or a vinyl group. Those having a functional group and a hydroxyl group are preferred.
  • the monomer containing a hydroxyl group in the molecule does not include the nitrogen atom-containing monomer. That is, in this specification, a monomer having both a nitrogen atom and a hydroxyl group in its molecule is included in the above-mentioned "nitrogen atom-containing monomer".
  • the "monomer having a hydroxyl group in the molecule” may be referred to as a "hydroxyl group-containing monomer".
  • a hydroxyl-containing monomer can be used individually or in combination of 2 or more types.
  • hydroxyl group-containing monomer examples include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, ( Hydroxyl group-containing (meth) 6-hydroxyhexyl acrylate, hydroxyoctyl (meth) acrylate, hydroxydecyl (meth) acrylate, hydroxyl lauryl (meth) acrylate, (4-hydroxymethylcyclohexyl) (meth) acrylate, etc. meth)acrylic acid ester; vinyl alcohol; and allyl alcohol.
  • the hydroxyl group-containing monomer is preferably a hydroxyl group-containing (meth)acrylic acid ester, more preferably 2-hydroxyethyl acrylate (HEA) or 4-hydroxybutyl acrylate (4HBA).
  • the proportion of the hydroxyl group-containing monomer in the total monomer components (100% by weight) constituting the acrylic polymer is particularly limited. However, it is preferably 0.5% by weight or more, more preferably 0.8% by weight or more, and still more preferably 1% by weight from the viewpoint of suppressing cloudiness and improving durability in a high-humidity environment. % or more. Further, the upper limit of the ratio of the hydroxyl group-containing monomer is preferably 30% by weight or less, more preferably 30% by weight or less, from the viewpoint of obtaining a pressure-sensitive adhesive layer having appropriate flexibility and obtaining a pressure-sensitive adhesive layer having excellent transparency. It is 25% by weight or less, more preferably 15% by weight or less.
  • the total ratio of the nitrogen atom-containing monomer and the hydroxyl group-containing monomer in the total monomer components (100% by weight) constituting the acrylic polymer is not particularly limited, but suppresses clouding in a high-humidity environment.
  • the content is preferably 1% by weight or more, more preferably 5% by weight or more, and still more preferably 10% by weight or more.
  • the upper limit of the total of the ratios is preferably 50% by weight or less, more preferably 40% by weight, from the viewpoint of obtaining a pressure-sensitive adhesive layer having moderate flexibility and obtaining a pressure-sensitive adhesive layer with excellent transparency. % or less, more preferably 35 wt % or less.
  • Copolymerizable monomers other than nitrogen atom-containing monomers and hydroxyl group-containing monomers further include alicyclic structure-containing monomers.
  • the alicyclic structure-containing monomer is not particularly limited as long as it has a polymerizable functional group having an unsaturated double bond such as a (meth)acryloyl group or a vinyl group and has an alicyclic structure.
  • an alkyl (meth)acrylate having a cycloalkyl group is included in the alicyclic structure-containing monomer.
  • an alicyclic structure containing monomer can be used individually or in combination of 2 or more types.
  • the alicyclic structure in the alicyclic structure-containing monomer is a cyclic hydrocarbon structure, preferably having 5 or more carbon atoms, more preferably 6 to 24 carbon atoms, further preferably 6 to 15 carbon atoms, and 6 to 10 are particularly preferred.
  • Examples of the alicyclic structure-containing monomer include cyclopropyl (meth)acrylate, cyclobutyl (meth)acrylate, cyclopentyl (meth)acrylate, cyclohexyl (meth)acrylate, cycloheptyl (meth)acrylate, cyclooctyl (meth)acrylate, isobornyl (meth)acrylate, dicyclopentanyl (meth)acrylate, HPMPA represented by the following formula (2), TMA-2 represented by the following formula (3), HCPA represented by the following formula (4), etc. of acrylic monomers.
  • the bonding position between the cyclohexyl ring connected by a line and the structural formula in parentheses there is no particular limitation on the bonding position between the cyclohexyl ring connected by a line and the structural formula in parentheses. Among these, isobornyl (meth)acrylate is preferred.
  • the proportion of the alicyclic structure-containing monomer in the total monomer components (100% by weight) constituting the acrylic polymer. is not particularly limited, but is preferably 10% by weight or more from the viewpoint of improving durability.
  • the upper limit of the ratio of the alicyclic structure-containing monomer is preferably 50% by weight or less, more preferably 40% by weight or less, and still more preferably 30% by weight or less, from the viewpoint of obtaining a pressure-sensitive adhesive layer having appropriate flexibility. is.
  • copolymerizable monomers include, for example, polyfunctional monomers.
  • the polyfunctional monomer include hexanediol di(meth)acrylate, butanediol di(meth)acrylate, (poly)ethylene glycol di(meth)acrylate, (poly)propylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, trimethylolpropane tri(meth)acrylate, tetramethylolmethane tri(meth)acrylate, Allyl (meth)acrylate, vinyl (meth)acrylate, divinylbenzene, epoxy acrylate, polyester acrylate, urethane acrylate and the like.
  • a polyfunctional monomer can be used individually
  • the ratio of the polyfunctional monomer in the total monomer components (100% by weight) constituting the acrylic polymer is although not particularly limited, it is preferably 0.5% by weight or less (for example, more than 0% by weight and 0.5% by weight or less), more preferably 0.2% by weight or less (for example, more than 0% by weight and 0.5% by weight or less). 2% by weight or less).
  • examples of the copolymerizable monomers include (meth)acrylic acid alkoxyalkyl esters.
  • the (meth)acrylic acid alkoxyalkyl ester is not particularly limited, but examples thereof include 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, methoxytriethylene glycol (meth)acrylate, ( 3-methoxypropyl meth)acrylate, 3-ethoxypropyl (meth)acrylate, 4-methoxybutyl (meth)acrylate, 4-ethoxybutyl (meth)acrylate and the like.
  • the alkoxyalkyl (meth)acrylate is preferably an alkoxyalkyl acrylate, more preferably 2-methoxyethyl acrylate (MEA).
  • the (meth)acrylic acid alkoxyalkyl esters may be used alone or in combination of two or more.
  • the ratio of the (meth)acrylic acid alkyl ester and the (meth)acrylic acid alkoxyalkyl ester is although not particularly limited, the [former: latter] (weight ratio) is preferably more than 100:0 and 25:75 or less, more preferably more than 100:0 and 50:50 or less.
  • the copolymerizable monomers include, for example, carboxyl group-containing monomers, epoxy group-containing monomers, sulfonic acid group-containing monomers, phosphoric acid group-containing monomers, aromatic hydrocarbon group-containing (meth)acrylic acid esters, vinyl esters, aromatic vinyl compounds, olefins or dienes, vinyl ethers, vinyl chloride and the like.
  • carboxyl group-containing monomers include (meth)acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, and isocrotonic acid.
  • the carboxyl group-containing monomers include maleic anhydride. and anhydride group-containing monomers such as itaconic anhydride.
  • Examples of the epoxy group-containing monomer include glycidyl (meth)acrylate and methylglycidyl (meth)acrylate.
  • Examples of the sulfonic acid group-containing monomer include sodium vinylsulfonate.
  • Examples of the (meth)acrylic ester having an aromatic hydrocarbon group include phenyl (meth)acrylate, phenoxyethyl (meth)acrylate, and benzyl (meth)acrylate.
  • Examples of the vinyl esters include vinyl acetate and vinyl propionate.
  • Examples of the aromatic vinyl compound include styrene and vinyltoluene.
  • Examples of the olefins or dienes include ethylene, propylene, butadiene, isoprene, and isobutylene.
  • Examples of the vinyl ethers include vinyl alkyl ethers.
  • the acrylic polymer constitutes a polymer in order to obtain an acrylic pressure-sensitive adhesive layer having excellent corrosion resistance.
  • the monomer component does not contain or substantially contains no acidic group-containing monomer, and particularly preferably does not contain or substantially contains no carboxyl group-containing monomer.
  • acidic group-containing monomers include carboxyl group-containing monomers, sulfonic acid group-containing monomers, phosphoric acid group-containing monomers, and the like.
  • the proportion of the acidic group-containing monomer in the total monomer components (100% by weight) constituting the acrylic polymer is 0.05% by weight or less (preferably 0.01% by weight or less). can be said to be substantially free of
  • the content of the base polymer (especially acrylic polymer) in the adhesive layer of the present invention is not particularly limited, but is 50% by weight or more (for example, 50% by weight) relative to 100% by weight of the total weight of the adhesive layer of the present invention. to 100% by weight), more preferably 80% by weight or more (eg, 80 to 100% by weight), and still more preferably 90% by weight or more (eg, 90 to 100% by weight).
  • the base polymer such as the acrylic polymer contained in the pressure-sensitive adhesive layer of the present invention is obtained by polymerizing monomer components.
  • the polymerization method is not particularly limited, but includes, for example, a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, and a polymerization method using active energy ray irradiation (active energy ray polymerization method).
  • the solution polymerization method and the active energy ray polymerization method are preferable from the viewpoints of the transparency of the pressure-sensitive adhesive layer and the cost.
  • various general solvents may be used in the polymerization of the monomer components.
  • the solvent include esters such as ethyl acetate and n-butyl acetate; aromatic hydrocarbons such as toluene and benzene; aliphatic hydrocarbons such as n-hexane and n-heptane; cyclohexane, methylcyclohexane and the like. alicyclic hydrocarbons; and organic solvents such as ketones such as methyl ethyl ketone and methyl isobutyl ketone.
  • a solvent can be used individually or in combination of 2 or more types.
  • a polymerization initiator such as a thermal polymerization initiator or a photopolymerization initiator (photoinitiator) may be used depending on the type of polymerization reaction.
  • a polymerization initiator can be used individually or in combination of 2 or more types.
  • thermal polymerization initiator examples include, but are not limited to, azo polymerization initiators, peroxide polymerization initiators (eg, dibenzoyl peroxide, tert-butyl permaleate, etc.), redox polymerization initiators, and the like. is mentioned. Among them, the azo polymerization initiator disclosed in JP-A-2002-69411 is preferable.
  • azo polymerization initiator examples include 2,2'-azobisisobutyronitrile (hereinafter sometimes referred to as "AIBN”), 2,2'-azobis-2-methylbutyronitrile (hereinafter, “AMBN”), 2,2′-azobis(2-methylpropionate)dimethyl, 4,4′-azobis-4-cyanovaleric acid and the like.
  • AIBN 2,2'-azobisisobutyronitrile
  • AMBN 2,2'-azobis-2-methylbutyronitrile
  • 2,2′-azobis(2-methylpropionate)dimethyl 4,4′-azobis-4-cyanovaleric acid and the like.
  • a thermal polymerization initiator can be used individually or in combination of 2 or more types.
  • the amount of the azo polymerization initiator used is not particularly limited. , preferably 0.05 parts by weight or more, more preferably 0.1 parts by weight or more, and preferably 0.5 parts by weight or less, more preferably 0.3 parts by weight It is below.
  • the photopolymerization initiator is not particularly limited. Active oxime-based photopolymerization initiators, benzoin-based photopolymerization initiators, benzyl-based photopolymerization initiators, benzophenone-based photopolymerization initiators, ketal-based photopolymerization initiators, thioxanthone-based photopolymerization initiators, and the like are included. Other examples include acylphosphine oxide photopolymerization initiators and titanocene photopolymerization initiators.
  • benzoin ether photopolymerization initiator examples include benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2,2-dimethoxy-1,2-diphenylethan-1-one, anisole methyl ether and the like.
  • acetophenone-based photopolymerization initiator examples include 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexylphenylketone, 4-phenoxydichloroacetophenone, 4-(t-butyl ) and dichloroacetophenone.
  • Examples of the ⁇ -ketol photopolymerization initiator include 2-methyl-2-hydroxypropiophenone, 1-[4-(2-hydroxyethyl)phenyl]-2-methylpropan-1-one, and the like. be done.
  • Examples of the aromatic sulfonyl chloride photopolymerization initiator include 2-naphthalenesulfonyl chloride.
  • Examples of the photoactive oxime photopolymerization initiator include 1-phenyl-1,1-propanedione-2-(O-ethoxycarbonyl)-oxime.
  • Examples of the benzoin-based photopolymerization initiator include benzoin.
  • Examples of the benzyl-based photopolymerization initiator include benzyl.
  • benzophenone-based photopolymerization initiator examples include benzophenone, benzoylbenzoic acid, 3,3'-dimethyl-4-methoxybenzophenone, polyvinylbenzophenone, ⁇ -hydroxycyclohexylphenyl ketone, and the like.
  • ketal-based photopolymerization initiator examples include benzyl dimethyl ketal.
  • Examples of the thioxanthone photopolymerization initiator include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxanthone, and dodecylthioxanthone.
  • Examples of the acylphosphine oxide-based photopolymerization initiator include 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide and bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide.
  • titanocene photopolymerization initiator examples include bis( ⁇ 5 -2,4-cyclopentadien-1-yl)-bis(2,6-difluoro-3-(1H-pyrrol-1-yl)-phenyl ) titanium and the like.
  • a photoinitiator can be used individually or in combination of 2 or more types.
  • the amount of the photopolymerization initiator used is not particularly limited. It is preferably 0.01 parts by weight or more, more preferably 0.1 parts by weight or more, and preferably 3 parts by weight or less, more preferably 1.5 parts by weight or less.
  • the pressure-sensitive adhesive layer of the present invention is not particularly limited, it preferably contains a high refractive index organic material.
  • a high-refractive-index organic material a high-refractive-index pressure-sensitive adhesive layer can be obtained, interfacial reflection with an OLED display panel can be suppressed, and the acceptance rate of light from the OLED element can be improved. ,preferable.
  • the high refractive index organic material can be used alone or in combination of two or more.
  • a high refractive index organic material means an organic material with a high refractive index.
  • a high refractive index organic material in combination with an acrylic polymer, it is possible to improve the refractive index, adhesive properties (peel strength, flexibility, etc.) and/or optical properties (total light transmittance, haze value, etc.).
  • a suitably compatible pressure sensitive adhesive can be achieved.
  • the organic material used as the high refractive index organic material may be a polymer or a non-polymer. Moreover, it may or may not have a polymerizable functional group.
  • the refractive index of the high-refractive-index organic material is not limited to a specific range, as it can be set within an appropriate range in relation to the refractive index of the acrylic polymer.
  • the high refractive index organic material has a refractive index greater than 1.50, greater than 1.55 or greater than 1.57, and higher than the refractive index of the acrylic polymer.
  • the refractive index of the high refractive index organic material is advantageously 1.58 or more, preferably 1.60 or more, and 1.63 or more. is more preferable, and may be 1.65 or more, 1.70 or more, or 1.75 or more.
  • a target refractive index can be achieved even by using a smaller amount of the high refractive index organic material. This is preferable from the viewpoint of suppressing deterioration of adhesive properties and optical properties.
  • the upper limit of the refractive index of the high-refractive-index organic material is not particularly limited. 2.500 or less, 2.000 or less, 1.950 or less, 1.900 or less, or 1.850 or less.
  • the high refractive index organic material can also be one that functions as a plasticizer that imparts flexibility to the pressure-sensitive adhesive layer.
  • the high refractive index organic material and the refractive index of the adhesive layer are measured using an Abbe refractometer under conditions of a measurement wavelength of 589 nm and a measurement temperature of 25°C. If the manufacturer or the like provides the nominal value of the refractive index at 25° C., the nominal value can be adopted.
  • ⁇ n A The difference between the refractive index n b of the high refractive index organic material and the refractive index na of the acrylic polymer, that is, n b ⁇ na (hereinafter also referred to as “ ⁇ n A ”) is set to be greater than 0. be.
  • ⁇ n A is, for example, 0.02 or more, 0.05 or more, 0.07 or more, 0.10 or more, 0.15 or more, 0.20 or more, or 0.25 or more good.
  • ⁇ n A may be, for example, 0.70 or less, 0.60 or less, 0.50 or less, or 0.40 or less, or 0.35 or less.
  • n B The difference between the refractive index n b of the high refractive index organic material and the refractive index n T of the adhesive layer containing the high refractive index organic material, that is, n b ⁇ n T (hereinafter also referred to as “ ⁇ n B ”) is , may be set to be greater than zero.
  • ⁇ n B is, for example, 0.02 or greater, 0.05 or greater, 0.07 or greater, 0.10 or greater, 0.15 or greater, or 0.20 or greater. Alternatively, it may be 0.25 or more.
  • ⁇ n B may be, for example, 0.70 or less, 0.60 or less, It may be 0.50 or less, 0.40 or less, or 0.35 or less.
  • the molecular weight of the organic material used as the high refractive index organic material is not particularly limited, and can be selected depending on the purpose. From the viewpoint of achieving a good balance between the effect of increasing the refractive index and other properties (e.g., flexibility suitable for adhesives, optical properties such as haze), the molecular weight of the high refractive index organic material is approximately less than 10,000. preferably less than 5,000, more preferably less than 3,000 (eg, less than 1,000), less than 800, less than 600, less than 500, or less than 400. It may be advantageous from the viewpoint of improving compatibility in the pressure-sensitive adhesive layer that the molecular weight of the high refractive index organic material is not too large.
  • the molecular weight of the high refractive index organic material may be, for example, 130 or more, or 150 or more. From the viewpoint of increasing the refractive index of the high refractive index organic material, the molecular weight of the high refractive index organic material is preferably 170 or more, more preferably 200 or more, may be 230 or more, or may be 250 or more. , 270 or more, 500 or more, 1000 or more, or 2000 or more. A polymer having a molecular weight of about 1000 to 10000 (for example, 1000 or more and less than 5000) can be used as the high refractive index organic material.
  • the molecular weight of the high refractive index organic material for non-polymers or polymers with a low degree of polymerization (for example, about 2- to 5-mers), the molecular weight calculated based on the chemical structure, or the matrix-assisted laser desorption ionization flight Measurements using time-based mass spectrometry (MALDI-TOF-MS) can be used. If the high refractive index organic material is a polymer with a higher degree of polymerization, the weight average molecular weight (Mw) based on GPC performed under appropriate conditions can be used. When the nominal value of the molecular weight is provided by the manufacturer or the like, the nominal value can be adopted.
  • Mw weight average molecular weight
  • aromatic ring of the organic compound having an aromatic ring (hereinafter also referred to as "aromatic ring-containing compound") used as the high refractive index organic material is the same as the aromatic ring of the compound used as the aromatic ring-containing monomer. can be selected from
  • the aromatic ring may have one or more substituents on the ring-constituting atoms, or may have no substituents.
  • the substituent includes an alkyl group, an alkoxy group, an aryloxy group, a hydroxyl group, a halogen atom (fluorine atom, chlorine atom, bromine atom, etc.), a hydroxyalkyl group, a hydroxyalkyloxy group, and a glycidyloxy group. etc. are exemplified, but not limited to these.
  • the number of carbon atoms contained in the substituent is, for example, 1 to 10, preferably 1 to 6, preferably 1 to 4, more preferably 1 to 3.
  • the aromatic ring is an aromatic ring having no substituents on ring-constituting atoms or having one or more substituents selected from the group consisting of alkyl groups, alkoxy groups and halogen atoms (e.g., bromine atoms). obtain.
  • a group having an ethylenically unsaturated group which may be a substituent bonded to a ring-constituting atom
  • Non-limiting examples of aromatic ring-containing compounds that can be used as high refractive index organic materials include benzyl acrylate, m-phenoxybenzyl acrylate, 2-(o-phenylphenoxy)ethyl acrylate, phenoxyethyl acrylate, phenoxydiethylene glycol acrylate.
  • phenoxypolyethylene glycol acrylate 2-hydroxy-3-phenoxypropyl acrylate, monomers having a fluorene structure described above, monomers having a dinaphthothiophene structure, monomers having a dibenzothiophene structure, and other aromatic ring-containing monomers; 3-phenoxybenzyl alcohol , dinaphthothiophene and derivatives thereof (for example, a structure in which one or more substituents selected from a hydroxy group, a methanol group, a diethanol group, a glycidyl group, etc. are bonded to the dinaphthothiophene ring.
  • aromatic ring-containing compounds having no ethylenically unsaturated groups such as compounds of ();
  • the aromatic ring-containing compound is an oligomer containing such an aromatic ring-containing monomer as a monomer unit (preferably an oligomer having a molecular weight of about 5000 or less, more preferably about 1000 or less. For example, a low polymer of about 2 to 5 mers ).
  • the oligomers are, for example: homopolymers of aromatic ring-containing monomers; copolymers of one or more aromatic ring-containing monomers; copolymers of one or more aromatic ring-containing monomers with other monomers. coalescence; and the like.
  • the other monomer one or more monomers having no aromatic ring may be used.
  • an organic compound having two or more aromatic rings in one molecule (hereinafter referred to as "a compound containing multiple aromatic rings") is used because it is easy to obtain a high refractive index increasing effect. Also called.) can be preferably adopted.
  • the compound containing multiple aromatic rings may or may not have a polymerizable functional group such as an ethylenically unsaturated group.
  • the compound containing multiple aromatic rings may be a polymer or a non-polymer.
  • the polymer is an oligomer (preferably an oligomer having a molecular weight of about 5000 or less, more preferably about 1000 or less; for example, a low polymer of about 2 to 5 mers) containing multiple aromatic ring-containing monomers as monomer units.
  • the oligomer is, for example: a homopolymer of a monomer containing multiple aromatic rings; a copolymer of one or more monomers containing multiple aromatic rings; a monomer containing one or more than two aromatic rings and another monomer. a copolymer of;
  • the other monomer may be an aromatic ring-containing monomer that does not correspond to a monomer containing multiple aromatic rings, a monomer having no aromatic ring, or a combination thereof.
  • Non-limiting examples of compounds containing multiple aromatic rings include compounds having a structure in which two or more non-fused aromatic rings are linked via a linking group, two or more non-fused aromatic rings directly (i.e., other atoms compounds having a chemically bonded structure, compounds having a condensed aromatic ring structure, compounds having a fluorene structure, compounds having a dinaphthothiophene structure, compounds having a dibenzothiophene structure, and the like.
  • the compounds containing multiple aromatic rings may be used singly or in combination of two or more.
  • the compound having a fluorene structure include the above-described monomers having a fluorene structure, oligomers that are homopolymers or copolymers of such monomers, and 9,9-bis(4-hydroxyphenyl)fluorene ( refractive index: 1.68), 9,9-bis(4-aminophenyl)fluorene (refractive index: 1.73), 9,9-bis(4-hydroxy-3-methylphenyl)fluorene (refractive index: 1 .68), 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene (refractive index: 1.65) and its derivatives.
  • the compound having a dinaphthothiophene structure include the above-described monomers having a dinaphthothiophene structure, oligomers that are homopolymers or copolymers of such monomers, and dinaphthothiophene (refractive index: 1.0).
  • hydroxyalkyldinaphthothiophenes such as 6-hydroxymethyldinaphthothiophene (refractive index: 1.766); dihydroxydinaphthothiophenes such as 2,12-dihydroxydinaphthothiophene (refractive index: 1.750); , 12-dihydroxyethyloxydinaphthothiophene (refractive index: 1.677); diglycidyloxydinaphthothiophene (refractive index: 1.723); naphthothiophene; dinaphthothiophene having two or more ethylenically unsaturated groups such as 2,12-diallyloxydinaphthothiophene (abbreviation: 2,12-DAODNT, refractive index 1.729); Derivatives thereof may be mentioned.
  • 2,12-DAODNT refractive index 1.729
  • the compound having a dibenzothiophene structure include the above-described monomers having a dibenzothiophene structure, oligomers that are homopolymers or copolymers of such monomers, dibenzothiophene (refractive index: 1.607), 4-dimethyldibenzothiophene (refractive index: 1.617), 4,6-dimethyldibenzothiophene (refractive index: 1.617) and the like.
  • Examples of organic compounds having a heterocyclic ring that can be options for high refractive index organic materials include thioepoxy compounds and compounds having a triazine ring.
  • Examples of thioepoxy compounds include bis(2,3-epithiopropyl)disulfide and its polymer (refractive index: 1.74) described in Japanese Patent No. 3712653.
  • Examples of compounds having a triazine ring include compounds having at least one (eg, 3 to 40, preferably 5 to 20) triazine rings in one molecule.
  • the triazine ring has aromaticity
  • the compound having a triazine ring is also included in the concept of the compound containing the aromatic ring
  • the compound having multiple triazine rings is also included in the concept of the compound containing multiple aromatic rings. be done.
  • a compound having no ethylenically unsaturated group can be preferably employed as the high refractive index organic material.
  • deterioration of the pressure-sensitive adhesive composition due to heat or light (decrease in leveling properties due to progression of gelation or increase in viscosity) can be suppressed, and storage stability can be enhanced.
  • Employing a high refractive index organic material that does not have an ethylenically unsaturated group means that an adhesive film having an adhesive layer containing the high refractive index organic material, a laminate including the adhesive film, or the like has ethylenically unsaturated It is also preferable from the viewpoint of suppressing dimensional change and deformation (warpage, waviness, etc.), optical distortion, etc. caused by reaction of groups.
  • the oligomer can be obtained by polymerizing the corresponding monomer component by a known method.
  • polymerization can be carried out by appropriately adding a polymerization initiator, a chain transfer agent, an emulsifier, etc. used for radical polymerization to the monomer component.
  • the polymerization initiator, chain transfer agent, emulsifier and the like used in the radical polymerization are not particularly limited and can be appropriately selected and used.
  • the weight-average molecular weight of the oligomer can be controlled by adjusting the amount of the polymerization initiator and the chain transfer agent used and the reaction conditions, and the amount used is appropriately adjusted according to these types.
  • chain transfer agent examples include lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2-mercaptoethanol, ⁇ -thioglycerol, thioglycolic acid, 2-ethylhexyl thioglycolate, 2,3-dimercapto-1-propanol, and the like. be done.
  • a chain transfer agent may be used individually by 1 type, and may be used in mixture of 2 or more types. The amount of the chain transfer agent used can be set according to the composition of the monomer components used in the synthesis of the oligomer, the type of the chain transfer agent, etc., so as to obtain an oligomer having a desired weight-average molecular weight.
  • the amount of the chain transfer agent used for 100 parts by weight of the total amount of monomers used in the synthesis of the oligomer is suitably about 15 parts by weight or less, may be 10 parts by weight or less, or may be 5 parts by weight. It may be less than a degree.
  • the lower limit of the amount of the chain transfer agent to be used with respect to 100 parts by weight of the total amount of monomers used for the synthesis of the oligomer is not particularly limited. It may be 5 parts by weight or more, or 1 part by weight or more.
  • the amount of the high-refractive-index organic material used relative to 100 parts by weight of the acrylic polymer (the total amount thereof when multiple types of compounds are used) is not particularly limited as long as it exceeds 0 parts by weight, and is set according to the purpose. be able to.
  • the amount of the high refractive index organic material used relative to 100 parts by weight of the acrylic polymer can be, for example, 80 parts by weight or less, achieving both a high refractive index of the adhesive and suppression of deterioration in adhesive properties and optical properties in a well-balanced manner. From the point of view, it is advantageous to use 60 parts by weight or less, preferably 45 parts by weight or less.
  • the amount of the high refractive index organic material used relative to 100 parts by weight of the acrylic polymer may be, for example, 30 parts by weight or less, 20 parts by weight or less, or 15 parts by weight or less. or less than 10 parts by weight.
  • the amount of the high refractive index organic material used relative to 100 parts by weight of the acrylic polymer can be, for example, 1 part by weight or more, and is preferably 3 parts by weight or more. It is preferably 5 parts by weight or more, may be 7 parts by weight or more, may be 10 parts by weight or more, may be 15 parts by weight or more, or may be 20 parts by weight or more.
  • the adhesive layer of the present invention is not particularly limited, it preferably contains an ultraviolet absorber (UVA).
  • UVA ultraviolet absorber
  • the pressure-sensitive adhesive layer of the present invention contains an ultraviolet absorber, it is possible to suppress deterioration of the OLED element due to ultraviolet rays contained in external light, and to obtain an OLED display device having excellent weather resistance without using a polarizing plate.
  • deterioration of the high refractive index component due to ultraviolet rays can be suppressed, and a high lighting efficiency can be maintained.
  • an ultraviolet absorber can be used individually or in combination of 2 or more types.
  • ultraviolet absorber examples include, but are not limited to, benzotriazole-based ultraviolet absorbers, hydroxyphenyltriazine-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, salicylic acid ester-based ultraviolet absorbers, cyanoacrylate-based ultraviolet absorbers, oxy Examples include benzophenone-based ultraviolet absorbers.
  • Benzotriazole-based UV absorbers include, for example, 2-(2-hydroxy-5-tert-butylphenyl)-2H-benzotriazole (trade name "TINUVIN PS", manufactured by BASF), benzene Ester compound of propanoic acid and 3-(2H-benzotriazol-2-yl)-5-(1,1-dimethylethyl)-4-hydroxy (C7-9 side chain and linear alkyl) (trade name "TINUVIN 384 -2", manufactured by BASF), octyl 3-[3-tert-butyl-4-hydroxy-5-(5-chloro-2H-benzotriazol-2-yl)phenyl]propionate and 2-ethylhexyl-3-[ A mixture of 3-tert-butyl-4-hydroxy-5-(5-chloro-2H-benzotriazol-2yl)phenyl]propionate (trade name "TINUVIN 109", manufactured by BASF), 2-(2-hydroxy-5-tert-buty
  • Hydroxyphenyltriazine-based UV absorbers include, for example, 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5 - Reaction product of hydroxyphenyl and [(C10-C16 (mainly C12-C13) alkyloxy) methyl] oxirane (trade name “TINUVIN 400” manufactured by BASF), 2-[4,6-bis(2, 4-dimethylphenyl)-1,3,5-triazin-2-yl]-5-[3-(dodecyloxy)-2-hydroxypropoxy]phenol), 2-(2,4-dihydroxyphenyl)-4, Reaction product of 6-bis-(2,4-dimethylphenyl)-1,3,5-triazine and (2-ethylhexyl)-glycidate (trade name “TINUVIN 405”, manufactured by BASF), 2,4 -bis(2-hydroxy-4-butoxyphenyl
  • Benzophenone UV absorbers (benzophenone compounds) and oxybenzophenone UV absorbers (oxybenzophenone compounds) include, for example, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4- Methoxybenzophenone-5-sulfonic acid (anhydrous and trihydrate), 2-hydroxy-4-octyloxybenzophenone, 4-dodecyloxy-2-hydroxybenzophenone, 4-benzyloxy-2-hydroxybenzophenone, 2,2'- Dihydroxy-4-methoxybenzophenone (trade name "KEMISORB 111", manufactured by Chemipro Kasei Co., Ltd.), 2,2',4,4'-tetrahydroxybenzophenone (trade name "SEESORB 106", manufactured by Sipro Kasei Co., Ltd.) , 2,2′-dihydroxy-4,4′-dimethoxybenzophenone and the like.
  • Salicylic acid ester-based ultraviolet absorbers include, for example, phenyl 2-acryloyloxybenzoate, phenyl 2-acryloyloxy-3-methylbenzoate, phenyl 2-acryloyloxy-4-methylbenzoate, phenyl 2- acryloyloxy-5-methylbenzoate, phenyl 2-acryloyloxy-3-methoxybenzoate, phenyl 2-hydroxybenzoate, phenyl 2-hydroxy-3-methylbenzoate, phenyl 2-hydroxy-4-methylbenzoate, phenyl 2-hydroxy- 5-methylbenzoate, phenyl 2-hydroxy-3-methoxybenzoate, 2,4-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate (trade name "TINUVIN 120", manufactured by BASF Corporation ) and the like.
  • Cyanoacrylate-based UV absorbers include, for example, alkyl 2-cyanoacrylates, cycloalkyl 2-cyanoacrylates, alkoxyalkyl 2-cyanoacrylates, alkenyl 2-cyanoacrylates, alkynyl 2-cyanoacrylates, and the like. mentioned.
  • a benzotriazole-based UV-absorbing agent has high UV-absorbing properties, excellent optical properties, ease of obtaining a pressure-sensitive adhesive layer having high transparency, and excellent photostability.
  • At least one UV absorber selected from the group consisting of benzophenone-based UV absorbers, benzophenone-based UV absorbers, and hydroxyphenyltriazine-based UV absorbers is preferred, and benzotriazole-based UV absorbers and benzophenone-based UV absorbers are more preferred.
  • a benzotriazole-based ultraviolet absorber in which a phenyl group having a group having 6 or more carbon atoms and a hydroxyl group as a substituent is bonded to a nitrogen atom constituting a benzotriazole ring is preferred.
  • a liquid ultraviolet absorber or two or more kinds of ultraviolet absorbers it is preferable to use.
  • the ultraviolet absorber preferably has an absorbance A of 0.5 or less, which is determined below.
  • Absorbance A Absorbance measured by applying light with a wavelength of 400 nm to a 0.08% toluene solution of the ultraviolet absorber
  • the content of the ultraviolet absorber in the pressure-sensitive adhesive layer (especially acrylic pressure-sensitive adhesive layer) of the present invention is not particularly limited, but is included in external light. From the viewpoint of suppressing deterioration of the OLED element due to ultraviolet rays and obtaining an OLED display device with excellent weather resistance without using a polarizing plate, it is preferably 0.01 part by weight or more with respect to 100 parts by weight of the acrylic polymer. , more preferably 0.05 parts by weight or more, and still more preferably 0.1 parts by weight or more.
  • the upper limit of the content of the ultraviolet absorber is to suppress the occurrence of yellowing of the pressure-sensitive adhesive due to the addition of the ultraviolet absorber, and to obtain excellent optical properties, high transparency, and excellent appearance properties. More preferably, it is 20 parts by weight or less, more preferably 10 parts by weight or less, and even more preferably 8 parts by weight or less with respect to 100 parts by weight of the acrylic polymer.
  • a dye compound whose absorption spectrum has a maximum absorption wavelength in the wavelength region of 380 to 430 nm can be contained.
  • the dye compound can also suppress the deterioration of the OLED element and the deterioration of the high refractive index component due to ultraviolet light.
  • the dye compounds may be used singly or in combination of two or more.
  • the content of the colorant compound as a whole is preferably 0.1 to 20 parts by weight with respect to 100 parts by weight of the base polymer (eg, acrylic polymer). It is preferably 1 to 10 parts by weight, preferably 0.1 to 5 parts by weight, more preferably 0.5 to 3 parts by weight.
  • Either one of the ultraviolet absorber and the dye compound can be used, but it is preferable to use the ultraviolet absorber and the dye compound together.
  • the ultraviolet absorber for example, although it can absorb light with a wavelength of 380 nm, the light in the wavelength region (380 nm to 430 nm) on the shorter wavelength side than the light emitting region (longer wavelength side than 430 nm) of the OLED element is sufficient. is not absorbed by the transmitted light, and deterioration may occur due to the transmitted light.
  • the dye compound can suppress the transmission of light with a wavelength (380 nm to 430 nm) on the shorter wavelength side than the light emitting region (longer wavelength side than 430 nm) of the OLED element, and the ultraviolet absorber and the dye compound are used in combination. As a result, a sufficient visible light transmittance can be ensured in the light emitting region of the OLED element.
  • the ultraviolet absorber is preferably 0.1 to 10 parts by weight with respect to 100 parts by weight of the base polymer (eg, acrylic polymer). It is preferably 0.1 to 5 parts by weight, more preferably 0.5 to 3 parts by weight.
  • the dye compound is preferably about 0.1 to 10 parts by weight, more preferably about 0.1 to 5 parts by weight, with respect to 100 parts by weight of the base polymer (eg, acrylic polymer). It is more preferably 0.5 to 3 parts by weight.
  • the dye compound is not particularly limited as long as it is a compound whose absorption spectrum has a maximum absorption wavelength in the wavelength range of 380 to 430 nm.
  • the maximum absorption wavelength means the absorption maximum wavelength showing the maximum absorbance among a plurality of absorption maxima in the spectral absorption spectrum in the wavelength region of 300 to 460 nm.
  • the maximum absorption wavelength of the absorption spectrum of the dye compound is more preferably in the wavelength range of 380 to 420 nm.
  • the dye compound is not particularly limited as long as it has the wavelength characteristics described above, but a material that does not impair the display properties of the OLED element and does not have fluorescence and phosphorescence performance (photoluminescence) is preferable.
  • the dye compound examples include organic dye compounds such as azomethine-based compounds, indole-based compounds, cinnamic acid-based compounds, pyrimidine-based compounds, porphyrin-based compounds, and cyanine-based compounds.
  • the organic dye compound can be suitably used as the organic dye compound.
  • the indole compound BONASORB UA3911 (trade name, maximum absorption wavelength of absorption spectrum: 398 nm, manufactured by Orient Chemical Industry Co., Ltd.)
  • the cinnamic acid compound SOM-5-0106 (trade name , maximum absorption wavelength of absorption spectrum: 416 nm, manufactured by Orient Chemical Industry Co., Ltd.)
  • FDB-001 as a porphyrin compound
  • cyanine As a system compound, merocyanine compound (trade name: FDB-009, maximum absorption wavelength of absorption spectrum: 394 nm, manufactured by Yamada Chemical Industry Co., Ltd.), polymethine compound (trade name: DAA-247, maximum absorption wavelength of absorption spectrum: 389 nm , manufactured by Yamada Chemical Industry Co., Ltd.).
  • merocyanine compound trade name: FDB-009, maximum absorption wavelength of absorption spectrum: 394 nm,
  • the adhesive layer of the present invention may contain a light stabilizer.
  • a light stabilizer When the pressure-sensitive adhesive layer of the present invention contains a light stabilizer, it is particularly preferable to contain the light stabilizer together with the ultraviolet absorber.
  • the light stabilizer can scavenge radicals generated by photo-oxidation, and thus can improve the resistance of the pressure-sensitive adhesive layer to light (especially ultraviolet rays).
  • a light stabilizer can be used individually or in combination of 2 or more types.
  • the light stabilizer examples include, but are not limited to, phenol light stabilizers (phenol compounds), phosphorus light stabilizers (phosphorus compounds), thioether light stabilizers (thioether compounds), amine light stabilizers, Stabilizers (amine compounds) (especially hindered amine stabilizers (hindered amine compounds)) and the like.
  • phenolic light stabilizer examples include 2,6-di-tertiary-butyl-4-methylphenol, 4-hydroxymethyl-2,6-di-tertiary-butylphenol, 2, 6-di-tertiary-butyl-4-ethylphenol, butylated hydroxyanisole, n-octadecyl 3-(4-hydroxy-3,5-di-tertiary-butylphenyl) propionate, distearyl (4-hydroxy- 3-methyl-5-tertiary-butyl)benzylmalonate, tocopherol, 2,2′-methylenebis(4-methyl-6-tertiary-butylphenol), 2,2′-methylenebis(4-ethyl-6-tertiary tertiary butylphenol), 4,4'-methylenebis (2,6-di-tertiary butylphenol), 4,4'-butylidenebis (6-tertiary butyl-m-cre
  • Phosphorus-based light stabilizers include, for example, trisnonylphenyl phosphite, tris(2,4-di-tertiary-butylphenyl)phosphite, tris[2-tertiary-butyl-4-( 3-tertiary-butyl-4-hydroxy-5-methylphenylthio)-5-methylphenyl]phosphite, tridecylphosphite, octyldiphenylphosphite, di(decyl)monophenylphosphite, di(tridecyl)penta Erythritol diphosphite, distearyl pentaerythritol diphosphite, di(nonylphenyl) pentaerythritol diphosphite, bis(2,4-di-tert-butylphenyl) pentaerythritol dip
  • Thioether-based light stabilizers include, for example, dilauryl thiodipropionate, dimyristyl, dialkylthiodipropionate compounds such as distearyl; polyol ⁇ such as tetrakis[methylene(3-dodecylthio)propionate]methane; -alkylmercaptopropionate ester compounds, and the like.
  • amine-based light stabilizers examples include polymers of dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol (trade name "TINUVIN 622", BASF Co.), a polymer of dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol and N,N',N'',N''-tetrakis-(4, 6-bis-(butyl-(N-methyl-2,2,6,6-tetramethylpiperidin-4-yl)amino)-triazin-2-yl)-4,7-diazadecane-1,10-diamine and 1:1 reaction product (trade name "TINUVIN 119", manufactured by BASF), dibutylamine 1,3-triazine N,N'-bis(2,2,6,6-tetramethyl-4- Polycondensate of piperidyl-1,6-hexamethylenediamine and N-(2,2,6,6-tetramethyl-4-pipe
  • the content of the light stabilizer in the pressure-sensitive adhesive layer of the present invention is not particularly limited, but resistance to light is improved. From the viewpoint of facilitating expression, it is preferably 0.1 parts by weight or more, more preferably 0.2 parts by weight or more, relative to 100 parts by weight of the acrylic polymer. In addition, the upper limit of the content is 5 parts by weight or less with respect to 100 parts by weight of the acrylic polymer, from the viewpoints that coloring due to the light stabilizer itself is unlikely to occur, high transparency can be easily obtained, and optical properties. is preferably 3 parts by weight or less.
  • a cross-linking agent may be used to form the pressure-sensitive adhesive layer of the present invention.
  • the gel fraction can be controlled by cross-linking the acrylic polymer in the acrylic pressure-sensitive adhesive layer.
  • a crosslinking agent can be used individually or in combination of 2 or more types.
  • the cross-linking agent is not particularly limited. cross-linking agents, metal salt-based cross-linking agents, carbodiimide-based cross-linking agents, oxazoline-based cross-linking agents, aziridine-based cross-linking agents, and amine-based cross-linking agents. Among them, isocyanate-based cross-linking agents and epoxy-based cross-linking agents are preferable, and isocyanate-based cross-linking agents are more preferable.
  • Examples of the isocyanate-based cross-linking agent include lower aliphatic polyisocyanates such as 1,2-ethylene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate; cyclopentylene diisocyanate; , cyclohexylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated xylene diisocyanate and other alicyclic polyisocyanates; 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate and aromatic polyisocyanates such as xylylene diisocyanate.
  • lower aliphatic polyisocyanates such as 1,2-ethylene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate
  • cyclopentylene diisocyanate
  • isocyanate-based cross-linking agent examples include trimethylolpropane/tolylene diisocyanate adduct (trade name “Coronate L”, manufactured by Tosoh Corporation), trimethylolpropane/hexamethylene diisocyanate adduct (trade name “Coronate HL”, manufactured by Tosoh Corporation), trimethylolpropane/xylylene diisocyanate adduct (trade name "Takenate D-110N", manufactured by Mitsui Chemicals, Inc.).
  • epoxy-based cross-linking agent examples include N,N,N',N'-tetraglycidyl-m-xylenediamine, diglycidylaniline, 1,3-bis(N,N-diglycidyl aminomethyl)cyclohexane, 1,6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, sorbitol polyglycidyl ether , glycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitan polyglycidyl ether, trimethylolpropane polyglycidyl ether,
  • the amount of the cross-linking agent used is not particularly limited. 001 parts by weight or more, more preferably 0.01 parts by weight or more.
  • the upper limit of the amount used is preferably 10 parts by weight or less with respect to 100 parts by weight of the base polymer, more preferably 10 parts by weight or less, from the viewpoint of obtaining appropriate flexibility in the pressure-sensitive adhesive layer and improving the adhesive strength. is 5 parts by weight or less.
  • the pressure-sensitive adhesive layer (especially acrylic pressure-sensitive adhesive layer) of the present invention contains a silane coupling agent in order to improve adhesion reliability under humidified conditions, particularly to improve adhesion reliability to glass.
  • a silane coupling agent can be used individually or in combination of 2 or more types.
  • the pressure-sensitive adhesive layer contains a silane coupling agent, the adhesiveness under humidified conditions, particularly the adhesiveness to glass, can be improved.
  • silane coupling agent examples include, but are not limited to, ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -glycidoxypropyltriethoxysilane, ⁇ -aminopropyltrimethoxysilane, N-phenyl-aminopropyltrimethoxysilane, methoxysilane and the like.
  • silane coupling agent for example, commercially available products such as the trade name "KBM-403" (manufactured by Shin-Etsu Chemical Co., Ltd.) can also be mentioned. Among them, ⁇ -glycidoxypropyltrimethoxysilane is preferable as the silane coupling agent.
  • the content of the silane coupling agent in the pressure-sensitive adhesive layer (particularly, acrylic pressure-sensitive adhesive layer) of the present invention is not particularly limited, but the It is preferably 0.01 parts by weight or more, more preferably 0.02 parts by weight or more, relative to 100 parts by weight of the base polymer.
  • the upper limit of the content of the silane coupling agent is preferably 10 parts by weight or less, more preferably 1 part by weight or less, relative to 100 parts by weight of the base polymer.
  • the pressure-sensitive adhesive layer of the present invention may optionally further contain a cross-linking accelerator, a tackifying resin (rosin derivative, polyterpene resin, petroleum resin, oil-soluble phenol, etc.), an antioxidant, a filler, a coloring agent (pigment or Dyes, etc.), antioxidants, chain transfer agents, plasticizers, softeners, surfactants, antistatic agents, and the like may be contained within the range that does not impair the effects of the present invention.
  • a cross-linking accelerator e.g., a tackifying resin (rosin derivative, polyterpene resin, petroleum resin, oil-soluble phenol, etc.), an antioxidant, a filler, a coloring agent (pigment or Dyes, etc.), antioxidants, chain transfer agents, plasticizers, softeners, surfactants, antistatic agents, and the like may be contained within the range that does not impair the effects of the present invention.
  • a cross-linking accelerator e.g., rosin derivative, polyterpene
  • the method for producing the pressure-sensitive adhesive layer (particularly, the acrylic pressure-sensitive adhesive layer) of the present invention is not particularly limited. and drying and curing the resulting adhesive composition layer, or coating (coating) the adhesive composition on a substrate (including a resin layer and a glass layer described later) or a release liner (coating process) and irradiating the obtained pressure-sensitive adhesive composition layer with an active energy ray to cure it. Moreover, you may heat-dry further as needed.
  • the active energy rays include ionizing radiation such as ⁇ -rays, ⁇ -rays, ⁇ -rays, neutron beams and electron beams, and ultraviolet rays, with ultraviolet rays being particularly preferred.
  • the irradiation energy of the active energy ray, the irradiation time, the irradiation method, etc. are not particularly limited.
  • the adhesive composition can be produced by a known or commonly used method.
  • a solvent-based acrylic pressure-sensitive adhesive composition can be prepared by mixing an additive (for example, an ultraviolet absorber, etc.) with a solution containing the acrylic polymer, if necessary.
  • an active energy ray-curable acrylic pressure-sensitive adhesive composition can be prepared by mixing an additive (for example, an ultraviolet absorber, etc.) with the acrylic monomer mixture or its partial polymer, if necessary. can be made.
  • a known coating method may be used for applying (coating) the pressure-sensitive adhesive composition.
  • coaters such as gravure roll coaters, reverse roll coaters, kiss roll coaters, dip roll coaters, bar coaters, knife coaters, spray coaters, comma coaters and direct coaters may be used.
  • the active energy ray-curable adhesive composition when the adhesive layer is formed from an active energy ray-curable adhesive composition, the active energy ray-curable adhesive composition preferably contains a photopolymerization initiator.
  • the active energy ray-curable pressure-sensitive adhesive composition contains an ultraviolet absorber, it preferably contains at least a photopolymerization initiator having light absorption properties in a wide wavelength range as a photopolymerization initiator.
  • it preferably contains at least a photopolymerization initiator that absorbs not only ultraviolet light but also visible light.
  • the adhesive composition contains a photopolymerization initiator that has light absorption characteristics in a wide wavelength range, high photocurability will be achieved in the adhesive composition. This is because it becomes easier to obtain.
  • An adhesive layer is a layer that can bind substances by being interposed between adherends. It means something that does not have
  • adhesive layer of the present invention Various adhesives can be applied as the adhesive for forming the adhesive layer constituting the optical element of the present invention (hereinafter sometimes referred to as the "adhesive layer of the present invention").
  • polyvinyl alcohol-based adhesives gelatin-based adhesives, vinyl-based latex-based adhesives, water-based polyesters, and the like. These adhesives are usually used as adhesives consisting of an aqueous solution (water-based adhesives) and contain 0.5 to 60% by weight of solids.
  • polyvinyl alcohol-based adhesives are preferable, and acetoacetyl group-containing polyvinyl alcohol-based adhesives are more preferable.
  • the water-based adhesive may contain a cross-linking agent.
  • a cross-linking agent a compound having at least two functional groups in one molecule that are reactive with components such as polymers constituting the adhesive is usually used. Examples include alkylenediamines; isocyanates; epoxies; Aldehydes: amino-formaldehydes such as methylol urea and methylol melamine.
  • the amount of the cross-linking agent compounded in the adhesive is usually about 10 to 60 parts by weight per 100 parts by weight of components such as polymers constituting the adhesive.
  • examples of the adhesive include active energy ray-curable adhesives such as ultraviolet-curable adhesives and electron beam-curable adhesives.
  • active energy ray-curable adhesive include (meth)acrylate adhesives.
  • examples of the curable component in the (meth)acrylate adhesive include a compound having a (meth)acryloyl group and a compound having a vinyl group.
  • examples of compounds having a (meth)acryloyl group include alkyl (meth)acrylates having 1 to 20 carbon atoms, chain alkyl (meth)acrylates, alicyclic alkyl (meth)acrylates, and polycyclic alkyl (meth)acrylates.
  • (Meth)acrylate adhesives include hydroxyethyl (meth)acrylamide, N-methylol (meth)acrylamide, N-methoxymethyl (meth)acrylamide, N-ethoxymethyl (meth)acrylamide, (meth)acrylamide, (meth) Nitrogen-containing monomers such as acryloylmorpholine may also be included.
  • (Meth)acrylate-based adhesives include tripropylene glycol diacrylate, 1,9-nonanediol diacrylate, tricyclodecanedimethanol diacrylate, cyclic trimethylolpropane formal acrylate, dioxane glycol diacrylate, and EO as crosslinking components.
  • Polyfunctional monomers such as modified diglycerin tetraacrylate may be included.
  • a compound having an epoxy group or an oxetanyl group can also be used as a cationic polymerization-curable adhesive.
  • the compound having an epoxy group is not particularly limited as long as it has at least two epoxy groups in the molecule, and various commonly known curable epoxy compounds can be used.
  • the adhesive may contain appropriate additives as necessary.
  • the additives include silane coupling agents, coupling agents such as titanium coupling agents, adhesion promoters such as ethylene oxide, ultraviolet absorbers, deterioration inhibitors, dyes, processing aids, ion trapping agents, and antioxidants. agents, tackifiers, fillers, plasticizers, leveling agents, foaming inhibitors, antistatic agents, heat stabilizers, hydrolysis stabilizers, and the like.
  • the adhesive may be applied to either one of the two adherends to be adhered, or to both.
  • a drying step can be performed to form the adhesive layer of the present invention consisting of a coated dry layer. After the drying step, ultraviolet rays or electron beams can be applied, if necessary.
  • the thickness of the adhesive layer of the present invention is not particularly limited. When using adhesives, electron beam curing adhesives, etc., the thickness is preferably about 0.1 to 100 ⁇ m, more preferably about 0.5 to 10 ⁇ m.
  • the resin layer constituting the optical element of the present invention (hereinafter sometimes referred to as the "resin layer of the present invention") is not particularly limited, but examples thereof include plastic films.
  • Materials for the plastic film include polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN); ), trade name “Zeonor” (manufactured by Nippon Zeon Co., Ltd.), etc.), acrylic resins such as polymethyl methacrylate (PMMA), polycarbonate (PC), triacetyl cellulose (TAC), polysulfone, polyarylate, polyether ether Plastic materials such as ketone (PEEK), polyimide (PI), transparent polyimide (CPI), polyvinyl chloride, polyvinyl acetate, polyethylene, polypropylene, ethylene-propylene copolymer, etc., have excellent dimensional stability and are resistant to shrinkage.
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • PET Polyethylene terephthalate
  • polyester resins such as polyethylene naphthalate (PEN), cyclic olefin polymers (COP), polycarbonate (PC), polyether ether ketone (PEEK), and transparent polyimide (CPI) are preferred, and polyethylene terephthalate is preferred.
  • PET polyethylene naphthalate
  • COP cyclic olefin polymers
  • PC polycarbonate
  • PEEK polyether ether ketone
  • CPI transparent polyimide
  • PET polyethylene terephthalate
  • CPI transparent polyimide
  • these plastic materials can be used individually or in combination of 2 or more types.
  • the "resin layer” does not include a release liner that is peeled off when the optical element of the present invention is used (attached).
  • the resin layer of the present invention is preferably transparent.
  • the total light transmittance (according to JIS K7361-1) of the resin layer of the present invention in the visible light wavelength region is not particularly limited, but is preferably 85% or more, more preferably 88% or more.
  • the haze (according to JIS K7136) of the resin layer of the present invention is not particularly limited, but is preferably 1.5% or less, more preferably 1.0% or less.
  • the difference in refractive index between the pressure-sensitive adhesive layer and the resin layer is not particularly limited. It is preferably 2 or less, preferably 1 or less, more preferably 0.5 or less, and particularly preferably 0.3 or less, from the viewpoint of improving the lighting rate of light from the device.
  • the thickness of the resin layer of the present invention is not particularly limited, it is preferably 10 to 80 ⁇ m, for example.
  • the resin layer of the present invention may have either a single layer structure or a multilayer structure.
  • the surface of the resin layer of the present invention may be appropriately subjected to known and commonly used surface treatments such as physical treatments such as corona discharge treatment and plasma treatment, and chemical treatments such as undercoating treatment.
  • the resin layer of the present invention is not particularly limited, it preferably contains an ultraviolet absorber (UVA) or a dye compound having a maximum absorption wavelength in the absorption spectrum of 380 to 430 nm.
  • UVA ultraviolet absorber
  • the resin layer of the present invention contains an ultraviolet absorber or the dye compound, deterioration of the OLED element due to ultraviolet rays contained in external light is suppressed, and an OLED display device having excellent weather resistance can be obtained without using a polarizing plate. can.
  • deterioration of the high refractive index component of the pressure-sensitive adhesive layer due to ultraviolet rays can be suppressed, and a high lighting rate can be maintained.
  • the resin layer of the present invention contains the ultraviolet absorber and the dye compound
  • the content of the ultraviolet absorber and the dye compound in the pressure-sensitive adhesive layer of the present invention can be reduced. Precipitation and bleeding out of the ultraviolet absorber and the dye compound in the inside can be suppressed, which is preferable.
  • UV absorber (UVA) and dye compound contained in the resin layer of the present invention the same ultraviolet absorber and dye compound contained in the pressure-sensitive adhesive layer of the present invention can be used.
  • the ultraviolet absorber and the dye compound can be used alone or in combination of two or more.
  • the content of each of the ultraviolet absorber and the dye compound in the resin layer of the present invention is not particularly limited, but is included in external light. From the viewpoint of suppressing deterioration of the OLED element due to ultraviolet rays and obtaining an OLED display device with excellent weather resistance without using a polarizing plate, it is preferably 0.01 part by weight or more with respect to 100 parts by weight of the resin layer, It is more preferably 0.05 parts by weight or more, and still more preferably 0.1 parts by weight or more.
  • the upper limit of the content of the ultraviolet absorber and the dye compound suppresses the occurrence of yellowing of the adhesive due to the addition of the ultraviolet absorber, and provides excellent optical properties, high transparency, and excellent appearance. From the viewpoint of obtaining properties, it is preferably 10 parts by weight or less, more preferably 9 parts by weight or less, and even more preferably 8 parts by weight or less with respect to 100 parts by weight of the resin layer.
  • the total amount may be adjusted to fall within the above range.
  • the moisture permeability of the resin layer of the present invention is not particularly limited. more preferably 5 g/m 2 ⁇ 24 h or more, more preferably 40 g/m 2 ⁇ 24 h or more, still more preferably 100 g/m 2 ⁇ 24 h or more, particularly preferably 200 g/m 2 ⁇ 24 h or more. be.
  • the upper limit of the moisture permeability of the resin layer of the present invention is not particularly limited, it may be 1200 g/m 2 ⁇ 24 h or less from the viewpoint of suppressing swelling under humidification. Since the resin layer of the present invention has a high moisture permeability, there is a tendency that the reliability of daylighting is improved.
  • the moisture permeability of the resin layer of the present invention can be measured in accordance with JIS Z0208 under an environment of a temperature of 40°C and a relative humidity of 92%, and can be adjusted by the type and thickness of the resin constituting the resin layer of the present invention. can be done.
  • the glass layer constituting the optical element of the present invention (hereinafter sometimes referred to as "the glass layer of the present invention") is not particularly limited, and suitable layers can be adopted depending on the purpose.
  • the glass layer of the present invention include soda-lime glass, boric acid glass, aluminosilicate glass, quartz glass, etc. according to classification according to composition.
  • the alkali component non-alkali glass and low-alkali glass can be mentioned.
  • the content of alkali metal components (eg, Na 2 O, K 2 O, Li 2 O) in the glass is preferably 15% by weight or less, more preferably 10% by weight or less.
  • the thickness of the glass layer of the present invention is preferably 20 ⁇ m or more, considering the surface hardness, airtightness, and corrosion resistance of the glass.
  • the glass layer of the present invention desirably has film-like flexibility and bendability, and suppresses the image from being doubled so that a clear image can be projected.
  • a thickness of 60 ⁇ m or less is preferable.
  • the thickness of the glass layer of the present invention is more preferably 30 ⁇ m or more and 55 ⁇ m or less, and particularly preferably 40 ⁇ m or more and 50 ⁇ m or less.
  • the light transmittance of the glass layer of the present invention at a wavelength of 550 nm is preferably 85% or more.
  • the refractive index of the glass layer of the present invention at a wavelength of 550 nm is preferably 1.4 to 1.65.
  • the density of the glass layer of the present invention is preferably 2.3 g/cm 3 to 3.0 g/cm 3 , more preferably 2.3 g/cm 3 to 2.7 g/cm 3 .
  • the method for forming the glass layer of the present invention is not particularly limited, and an appropriate method can be adopted depending on the purpose.
  • the glass layer of the present invention is prepared by heating a mixture containing a main raw material such as silica or alumina, an antifoaming agent such as mirabilite or antimony oxide, and a reducing agent such as carbon at a temperature of about 1400°C to 1600°C. It can be produced by melting at a high temperature, molding it into a thin plate, and then cooling it.
  • Examples of the method for forming the glass layer of the present invention include a slot down draw method, a fusion method, a float method and the like.
  • the glass layer formed into a plate shape by these methods may be chemically polished with a solvent such as hydrofluoric acid, if necessary, in order to thin the plate or improve smoothness.
  • the hard coat layer constituting the optical element of the present invention (hereinafter sometimes referred to as the "hard coat layer of the present invention") has sufficient surface hardness, excellent mechanical strength, and excellent light transmittance. , may be formed from any suitable resin. Specific examples of resins include thermosetting resins, thermoplastic resins, ultraviolet curing resins, electron beam curing resins, and two-liquid mixed resins. A UV curable resin is preferred. This is because the hard coat layer can be formed with simple operation and high efficiency.
  • UV-curable resins include polyester-based, acrylic-based, urethane-based, amide-based, silicone-based, and epoxy-based UV-curable resins.
  • UV-curable resins include UV-curable monomers, oligomers, and polymers.
  • Preferred UV-curable resins include resin compositions containing acrylic monomer or oligomer components having preferably 2 or more, more preferably 3 to 6, UV-polymerizable functional groups.
  • the UV curable resin contains a photopolymerization initiator.
  • the hard coat layer of the present invention can be formed by any appropriate method.
  • the hard coat layer of the present invention is formed by coating a resin composition for forming a hard coat layer on a substrate (including the resin layer and the glass layer), drying the coating, and irradiating the dried coating film with ultraviolet rays. can be formed by curing with
  • the thickness of the hard coat layer of the present invention is, for example, 2 ⁇ m to 20 ⁇ m, preferably 4 ⁇ m to 15 ⁇ m.
  • the water contact angle of the hard coat layer of the present invention is preferably 95° or more, more preferably 100° or more, still more preferably 105° or more, from the viewpoint of antifouling properties.
  • the water contact angle of the hard coat layer of the present invention is measured according to JIS R3257, and can be adjusted depending on the type of resin constituting the hard coat layer, curing conditions, and the like.
  • the Vickers hardness of the hard coat layer of the present invention is preferably 80 or higher, more preferably 90 or higher, still more preferably 100 or higher, from the viewpoint of excellent surface hardness and scratch resistance.
  • the Vickers hardness of the hard coat layer of the present invention is measured according to JIS Z2244, and can be adjusted depending on the type of resin constituting the hard coat layer, curing conditions, and the like.
  • the surface element ratio of carbon elements on the surface of the hard coat layer of the present invention is 50 atomic % or less, preferably 45 atomic % or less, from the viewpoint of antifouling properties, and the fluorine element ratio on the surface of the hard coat layer is 30 atomic % or more. be.
  • the nitrogen element ratio on the surface of the hard coat layer is, for example, less than 1.5 atomic %, preferably 1.3 atomic % or less, and is, for example, 0 atomic % or more.
  • the surface element ratio of fluorine element, carbon element, and nitrogen element on the surface of the hard coat layer of the present invention can be measured by X-ray photoelectron spectroscopy, and the type of resin constituting the hard coat layer, curing conditions, etc. can be adjusted by
  • Antireflection layer As the antireflection layer constituting the optical element of the present invention (hereinafter sometimes referred to as the "antireflection layer of the present invention"), any appropriate configuration can be adopted.
  • Materials that can form the low refractive index layer include, for example, silicon oxide (SiO 2 ) and magnesium fluoride (MgF 2 ).
  • the refractive index of the low refractive index layer is typically about 1.35 to 1.55.
  • the material of the low refractive index layer may be a cured product of a curable fluorine-containing resin.
  • a curable fluorine-containing resin has, for example, structural units derived from a fluorine-containing monomer and structural units derived from a crosslinkable monomer.
  • fluorine-containing monomers include fluoroolefins (fluoroethylene, vinylidene fluoride, tetrafluoroethylene, hexafluoroethylene, hexafluoropropylene, perfluoro-2,2-dimethyl-1,3-dioxole, etc.).
  • crosslinkable monomers include (meth)acrylate monomers having crosslinkable functional groups in the molecule such as glycidyl methacrylate; (meth)acrylate monomers having functional groups such as carboxyl groups, hydroxyl groups, amino groups and sulfonic acid groups.
  • the fluorine-containing resin may have constitutional units derived from monomers other than the compounds described above (for example, olefin-based monomers, (meth)acrylate-based monomers, and styrene-based monomers).
  • Materials capable of forming the high refractive index layer include, for example, titanium oxide (TiO 2 ), niobium oxide (Nb 2 O 3 or Nb 2 O 5 ), tin-doped indium oxide (ITO), antimony-doped tin oxide (ATO), ZrO 2 --TiO 2 can be mentioned.
  • the refractive index of the high refractive index layer is typically about 1.60 to 2.20.
  • Materials capable of forming the medium refractive index layer include, for example, titanium oxide (TiO 2 ), a mixture of a material capable of forming a low refractive index layer and a material capable of forming a high refractive index layer (for example, titanium oxide and oxide mixtures with silicon).
  • the refractive index of the medium refractive index layer is typically about 1.50 to 1.85.
  • the thicknesses of the low refractive index layer, the medium refractive index layer, and the high refractive index layer can be set so as to realize an appropriate optical film thickness according to the layer structure of the antireflection layer, desired antireflection performance, and the like.
  • the antireflection layer of the present invention may be formed by a dry process (e.g., sputtering), may be formed by a wet process (e.g., coating), or may be formed by combining a dry process and a wet process.
  • a dry process e.g., sputtering
  • a wet process e.g., coating
  • a wet process e.g., coating
  • a dry process include a PVD (Physical Vapor Deposition) method and a CVD (Chemical Vapor Deposition) method.
  • PVD methods include vacuum vapor deposition, reactive vapor deposition, ion beam assist, sputtering, and ion plating.
  • the CVD method there is a plasma CVD method.
  • a coating liquid for forming an antireflection layer can be applied to form a coating film, and the coating film can be cured to form an antireflection layer.
  • coating methods that can be used include fountain coating, die coating, spin coating, spray coating, gravure coating, roll coating, and bar coating. It is preferable to dry the coating film prior to the curing. The drying may be, for example, natural drying, air drying by blowing air, heat drying, or a combination thereof. Curing means for the coating film is not particularly limited, but UV curing is preferred.
  • the thickness of the antireflection layer of the present invention is, for example, about 20 nm to 300 nm.
  • Antiglare layer As the antiglare layer constituting the optical element of the present invention (hereinafter sometimes referred to as the "antiglare layer of the present invention"), known ones can be employed without limitation. It is formed as a layer in which inorganic or organic particles are dispersed as an antiglare agent.
  • the antiglare layer of the present invention is not particularly limited. , convex portions are formed on the surface of the antiglare layer of the present invention. With this configuration, the antiglare layer has excellent display characteristics that achieve both antiglare properties and prevention of white blurring. It is possible to prevent the occurrence of protrusions on the surface of the anti-glare layer, which would be a defect in appearance, and improve the yield of the product.
  • the resin examples include thermosetting resins and ionizing radiation curable resins that are cured by ultraviolet light or light.
  • thermosetting resins examples include thermosetting resins and ionizing radiation curable resins that are cured by ultraviolet light or light.
  • the resin it is possible to use a commercially available thermosetting resin, ultraviolet curable resin, or the like.
  • thermosetting resin or UV-curable resin for example, a curable compound having at least one of an acrylate group and a methacrylate group that is cured by heat, light (ultraviolet rays, etc.), electron beams, or the like can be used.
  • Silicone resins, polyester resins, polyether resins, epoxy resins, urethane resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, oligomers or prepolymers such as acrylates and methacrylates of polyfunctional compounds such as polyhydric alcohols. can give. These may be used individually by 1 type, and may use 2 or more types together.
  • a reactive diluent having at least one of an acrylate group and a methacrylate group can be used.
  • the reactive diluent for example, reactive diluents described in JP-A-2008-88309 can be used, and examples include monofunctional acrylates, monofunctional methacrylates, polyfunctional acrylates, polyfunctional methacrylates, and the like.
  • the reactive diluent tri- or more functional acrylates and tri- or more functional methacrylates are preferable. This is because the antiglare layer of the present invention can have excellent hardness.
  • Examples of the reactive diluent include butanediol glycerol ether diacrylate, isocyanuric acid acrylate, and isocyanuric acid methacrylate. These may be used individually by 1 type, and may use 2 or more types together.
  • the resin preferably contains a urethane acrylate resin, more preferably a copolymer of a curable urethane acrylate resin and a polyfunctional acrylate (eg, pentathritol triacrylate).
  • a urethane acrylate resin more preferably a copolymer of a curable urethane acrylate resin and a polyfunctional acrylate (eg, pentathritol triacrylate).
  • the main functions of the particles for forming the antiglare layer of the present invention are to make the surface of the antiglare layer to be uneven to impart antiglare properties and to control the haze value of the antiglare layer.
  • the haze value of the antiglare layer can be designed by controlling the refractive index difference between the particles and the resin.
  • the particles include inorganic particles and organic particles.
  • the inorganic particles are not particularly limited, and examples include silicon oxide particles, titanium oxide particles, aluminum oxide particles, zinc oxide particles, tin oxide particles, zirconium oxide particles, calcium carbonate particles, barium sulfate particles, talc particles, kaolin particles, Examples include calcium sulfate particles.
  • the organic particles are not particularly limited, and examples include polymethyl methacrylate resin powder (PMMA fine particles), silicone resin powder, polystyrene resin powder, polycarbonate resin powder, acrylic styrene resin powder, benzoguanamine resin powder, melamine resin powder, polyolefin. Examples thereof include resin powder, polyester resin powder, polyamide resin powder, polyimide resin powder, polyethylene fluoride resin powder and the like. One type of these inorganic particles and organic particles may be used alone, or two or more types may be used in combination.
  • PMMA fine particles polymethyl methacrylate resin powder
  • silicone resin powder silicone resin powder
  • polystyrene resin powder polycarbonate resin powder
  • acrylic styrene resin powder acrylic styrene resin powder
  • benzoguanamine resin powder acrylic styrene resin powder
  • melamine resin powder polyolefin
  • polyolefin examples include resin powder, polyester resin powder, polyamide resin powder, polyimide resin powder, polyethylene fluoride resin powder
  • the weight average particle size (D) of the particles is preferably within the range of 2.5 to 10 ⁇ m. By setting the weight-average particle size of the particles within the above range, for example, the anti-glare property can be further improved and white blurring can be prevented.
  • the weight average particle size of the particles is more preferably in the range of 3-7 ⁇ m.
  • the weight-average particle diameter of the particles can be measured, for example, by the Coulter counting method. For example, using a particle size distribution measuring device (trade name: Coulter Multisizer, manufactured by Beckman Coulter, Inc.) using the pore electrical resistance method, the volume of the electrolyte solution corresponding to the volume of the particles when the particles pass through the pores. By measuring the electrical resistance, the number and volume of the particles are measured, and the weight average particle diameter is calculated.
  • the shape of the particles is not particularly limited, and may be, for example, a substantially spherical bead shape, or an irregular shape such as a powder. They are substantially spherical particles with a ratio of 1.5 or less, most preferably spherical particles.
  • the proportion of the particles in the antiglare layer of the present invention is preferably in the range of 0.2 to 12 parts by weight, more preferably in the range of 0.5 to 12 parts by weight, with respect to 100 parts by weight of the resin. It is preferably in the range of 1 to 7 parts by weight. By setting it as the said range, for example, it can be more excellent in anti-glare property and can prevent a white blur.
  • the antiglare layer of the present invention may contain a thixotropy-imparting agent.
  • a thixotropy-imparting agent By containing the thixotropy-imparting agent, the aggregation state of the particles can be easily controlled.
  • the thixotropy imparting agent for forming the antiglare layer of the present invention include organic clay, polyolefin oxide, modified urea and the like.
  • the organoclay is preferably an organically treated clay in order to improve the affinity with the resin.
  • organic clays include layered organic clays.
  • the organic clay may be self-prepared, or a commercially available product may be used.
  • the commercially available products include Lucentite SAN, Lucentite STN, Lucentite SEN, Lucentite SPN, Somasif ME-100, Somasif MAE, Somasif MTE, Somasif MEE, Somasif MPE (trade names, all of which are manufactured by Co-op Chemical Co., Ltd.).
  • the oxidized polyolefin may be prepared in-house, or a commercially available product may be used.
  • the commercially available products include Disparlon 4200-20 (trade name, manufactured by Kusumoto Kasei Co., Ltd.) and Flownon SA300 (trade name, manufactured by Kyoeisha Chemical Co., Ltd.).
  • the modified urea is a reaction product of an isocyanate monomer or its adduct and an organic amine.
  • the modified urea may be self-prepared, or a commercially available product may be used. Examples of the commercial product include BYK410 (manufactured by Big Chemie).
  • the thixotropy-imparting agents may be used singly or in combination of two or more.
  • the height of the convex portion from the roughness average line of the antiglare layer of the present invention is preferably less than 0.4 times the thickness of the antiglare layer. More preferably, it is in the range of 0.01 times or more and less than 0.4 times, and still more preferably in the range of 0.01 times or more and less than 0.3 times. If it is within this range, it is possible to suitably prevent the formation of protrusions that would cause defects in appearance on the convex portion.
  • the anti-glare layer of the present invention can make appearance defects less likely to occur by having convex portions with such heights.
  • the height from the average line can be measured, for example, by the method described in JP-A-2017-138620.
  • the ratio of the thixotropy imparting agent in the antiglare layer of the present invention is preferably in the range of 0.1 to 5 parts by weight, more preferably in the range of 0.2 to 4 parts by weight, with respect to 100 parts by weight of the resin. .
  • the thickness (d) of the antiglare layer of the present invention is not particularly limited, it is preferably within the range of 3 to 12 ⁇ m.
  • the thickness (d) of the antiglare layer is preferably within the range of 3 to 12 ⁇ m.
  • the optical layered body of the present invention can be prevented from curling, and the problem of reduced productivity such as poor transportability can be avoided.
  • the weight average particle size (D) of the particles is preferably within the range of 2.5 to 10 ⁇ m as described above.
  • the thickness (d) of the antiglare layer of the invention is more preferably in the range of 3 to 8 ⁇ m.
  • the relationship between the thickness (d) of the antiglare layer of the present invention and the weight average particle size (D) of the particles is preferably within the range of 0.3 ⁇ D/d ⁇ 0.9. With such a relationship, it is possible to obtain an antiglare layer that is more excellent in antiglare properties, can prevent white blurring, and has no defects in appearance.
  • the antiglare layer of the present invention projections are formed on the surface of the antiglare layer of the present invention by aggregation of the particles and the thixotropy-imparting agent.
  • the particles are present in a state in which a plurality of particles are aggregated in the plane direction of the antiglare layer of the present invention.
  • the convex portion has a gentle shape. Since the antiglare layer of the present invention has convex portions having such a shape, it is possible to prevent white blurring while maintaining antiglare properties, and to make appearance defects less likely to occur. can.
  • the surface shape of the antiglare layer of the present invention can be arbitrarily designed by controlling the aggregation state of the particles contained in the antiglare layer-forming material.
  • the aggregation state of the particles can be controlled by, for example, the material of the particles (for example, chemically modified state of the particle surface, affinity for solvent or resin, etc.), type of resin (binder) or solvent, combination, and the like.
  • the aggregation state of the particles can be controlled by the thixotropy imparting agent contained in the antiglare layer-forming material of the present invention. As a result, the aggregated state of the particles can be made as described above, and the convex portion can be formed into a smooth shape.
  • the number of appearance defects having a maximum diameter of 200 ⁇ m or more is 1 or less per 1 m 2 of the antiglare layer. More preferably, it does not have the appearance defect.
  • the average inclination angle ⁇ a (°) is preferably in the range of 0.1 to 5.0, more preferably in the range of 0.3 to 4.5. , more preferably in the range of 1.0 to 4.0, and particularly preferably in the range of 1.6 to 4.0.
  • the average tilt angle ⁇ a is a value defined by the following formula (1).
  • the average tilt angle ⁇ a is, for example, a value measured by the method described in JP-A-2017-138620.
  • Average tilt angle ⁇ a tan-1 ⁇ a (1)
  • ⁇ a is, as shown in the following formula (2), the maximum distance between the apex and valley of adjacent peaks in the reference length L of the roughness curve defined in JIS B0601 (1994 edition). It is a value obtained by dividing the total (h1+h2+h3 .
  • the roughness curve is a curve obtained by removing surface waviness components longer than a predetermined wavelength from the cross-sectional curve with a phase difference compensation type high-pass filter.
  • ⁇ a is within the above range, the antiglare property is more excellent and white blurring can be prevented.
  • the prepared antiglare layer forming material exhibits thixotropy
  • the Ti value defined below is 1.3 to 3.5. is preferably in the range of , more preferably in the range of 1.3 to 2.8.
  • Ti value ⁇ 1/ ⁇ 2
  • ⁇ 1 is the viscosity measured at a shear rate of 20 (1/s) using HAAKE's Rheostress 6000
  • ⁇ 2 is the viscosity measured using HAAKE's Rheostress 6000 at a shear rate of 200 (1/s). Viscosity measured under conditions.
  • the Ti value is less than 1.3, defects in appearance tend to occur, and the properties of antiglare properties and white blur deteriorate.
  • the Ti value exceeds 3.5, the particles are less likely to agglomerate and more likely to be in a dispersed state.
  • the method for producing the antiglare layer of the present invention is not particularly limited and may be produced by any method.
  • liquid) is prepared, the antiglare layer-forming material (coating liquid) is applied to form a coating film, and the coating film is cured to form an antiglare layer.
  • a transfer method using a mold, a method of imparting an uneven shape by an appropriate method such as sandblasting, embossing roll, or the like can also be used together.
  • the solvent is not particularly limited, and various solvents can be used. One type may be used alone, or two or more types may be used in combination. There is an optimum solvent type and solvent ratio depending on the composition of the resin, the types and contents of the particles and the thixotropy-imparting agent, and the like.
  • solvents include, but are not limited to, alcohols such as methanol, ethanol, isopropyl alcohol, butanol, and 2-methoxyethanol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclopentanone; methyl acetate, ethyl acetate.
  • Esters such as butyl acetate; Ethers such as diisopropyl ether and propylene glycol monomethyl ether; Glycols such as ethylene glycol and propylene glycol; Cellosolves such as ethyl cellosolve and butyl cellosolve; Aliphatic hydrocarbons such as hexane, heptane and octane Aromatic hydrocarbons such as benzene, toluene, and xylene.
  • the thixotropy of the antiglare layer-forming material (coating liquid) by the thixotropy-imparting agent can be exhibited satisfactorily.
  • organoclays when organoclays are used, toluene and xylene can be suitably used alone or in combination. They can be used or used in combination.
  • modified urea when modified urea is used, butyl acetate and methyl isobutyl ketone can be preferably used alone or in combination.
  • leveling agents can be added to the antiglare layer-forming material.
  • a fluorine-based or silicone-based leveling agent can be used for the purpose of preventing coating unevenness (uniformizing the coated surface).
  • a suitable leveling agent is selected according to the case where the antifouling property is required on the surface of the antiglare layer of the present invention, or the case where an antireflection layer or a layer containing an interlayer filler is formed on the antiglare layer. be able to.
  • the inclusion of the thixotropy-imparting agent makes it possible to express thixotropic properties in the coating liquid, so that unevenness in coating is less likely to occur. Therefore, for example, it has an advantage that the options for the leveling agent can be expanded.
  • the amount of the leveling agent compounded is, for example, 5 parts by weight or less, preferably in the range of 0.01 to 5 parts by weight, per 100 parts by weight of the resin.
  • Pigments, fillers, dispersants, plasticizers, ultraviolet absorbers, surfactants, antifouling agents, antioxidants, etc. are added to the antiglare layer-forming material as necessary within a range that does not impair the performance. may be These additives may be used singly or in combination of two or more.
  • photopolymerization initiators such as those described in JP-A-2008-88309, can be used.
  • Examples of the method for applying the antiglare layer-forming material include a fountain coating method, a die coating method, a spin coating method, a spray coating method, a gravure coating method, a roll coating method, a bar coating method, and the like. can be done.
  • the antiglare layer-forming material is applied to form a coating film, and the coating film is cured. It is preferable to dry the coating film prior to the curing.
  • the drying may be, for example, natural drying, air drying by blowing air, heat drying, or a combination thereof.
  • the means for curing the coating film of the antiglare layer-forming material is not particularly limited, but ultraviolet curing is preferable.
  • the irradiation amount of the energy beam source is preferably 50 to 500 mJ/cm 2 as an integrated exposure amount at an ultraviolet wavelength of 365 nm.
  • the irradiation dose is 50 mJ/cm 2 or more, the curing becomes more sufficient, and the hardness of the formed antiglare layer becomes more sufficient. Also, if it is 500 mJ/cm 2 or less, coloring of the formed antiglare layer can be prevented.
  • the antiglare layer of the present invention can be formed as described above. In addition, you may form an anti-glare layer by manufacturing methods other than the above-mentioned method.
  • the hardness of the antiglare layer of the present invention is preferably 2H or higher in terms of pencil hardness, although it is also affected by the thickness of the layer.
  • the antiglare layer of the present invention may have a multi-layer structure in which two or more layers are laminated.
  • the antireflection layer described above may be placed on the antiglare layer of the present invention.
  • one factor that reduces the visibility of an OLED display device is the reflection of light at the interface between the air and the antiglare layer.
  • An antireflection layer reduces the surface reflection.
  • the antiglare layer and the antireflection layer of the present invention may each have a multi-layer structure in which two or more layers are laminated.
  • the intermediate layer constituting the optical element of the present invention (hereinafter sometimes referred to as the “intermediate layer of the present invention") is provided between the resin layer and the hard coat layer, antireflection layer, or antiglare layer. is formed in Formation of this intermediate layer improves adhesion between the resin layer and the hard coat layer, antireflection layer, or antiglare layer.
  • the mechanism by which the intermediate layer (also referred to as a permeation layer or compatible layer) of the present invention is formed is not particularly limited. It is formed in the process of coating, permeating, and drying the resin layer with a coating solution for coating, a coating solution for forming an antireflection layer, or a coating solution for forming an antiglare layer.
  • the coating liquid for forming a hard coat layer, the coating liquid for forming an antireflection layer, or the coating liquid for forming an antiglare layer permeates the resin layer, and the resin derived from the resin layer and the hard coat
  • the intermediate layer is formed comprising a layer, an antireflection layer, or a resin derived from the antiglare layer.
  • the resin contained in the intermediate layer is not particularly limited.
  • the resin contained in the resin layer and the resin contained in the hard coat layer, the antireflection layer, or the antiglare layer are simply mixed (compatible). It's okay.
  • At least one of the resin contained in the intermediate layer and the resin contained in the hard coat layer, the antireflection layer, or the antiglare layer may be chemically cured by heating, light irradiation, or the like. may have changed.
  • the thickness ratio R of the intermediate layer defined by the following formula (3) is not particularly limited, but is, for example, 0.10 to 0.80. 0.30 or more, 0.40 or more, or 0.45 or more, for example, 0.75 or less, 0.70 or less, 0.65 or less, 0.60 or less, 0.50 or less, It may be 0.40 or less, 0.45 or less, or 0.30 or less.
  • the thickness ratio R of the intermediate layer is, for example, 0.15 to 0.75, 0.20 to 0.70, 0.25 to 0.65, 0.30 to 0.60, 0.40 to 0.50. , 0.45-0.50, 0.15-0.45, 0.15-0.40, 0.15-0.30, or 0.20-0.30.
  • the intermediate layer can be confirmed, for example, by observing the cross section of the optical element with a transmission electron microscope (TEM), and the thickness can be measured.
  • TEM transmission electron microscope
  • R [DC/(DC+DB)] (3)
  • DB is the thickness [ ⁇ m] of the hard coat layer, the antireflection layer, or the antiglare layer
  • DC is the thickness [ ⁇ m] of the intermediate layer.
  • the strength is preferably 20 MPa or more, more preferably 50 MPa or more.
  • the shear breaking strength can be obtained by the SAICAS method, and the type of resin layer, the composition of the coating liquid for forming the hard coat layer, the coating liquid for forming the antireflection layer, the coating liquid for forming the antiglare layer, and the film formation It can be adjusted according to the law.
  • the impact-absorbing layer constituting the optical element of the present invention may be composed of any appropriate resin layer capable of achieving a desired impact-absorbing rate.
  • the resin layer may be composed of a resin film or an adhesive.
  • the shock absorbing layer typically contains epoxy resin, urethane resin or acrylic resin. These resins may be used alone or in combination.
  • the thickness of the shock absorbing layer of the present invention is preferably 30 ⁇ m to 200 ⁇ m, more preferably 30 ⁇ m to 150 ⁇ m, still more preferably 40 ⁇ m to 120 ⁇ m. If the thickness of the impact-absorbing layer of the present invention is within such a range, an optical laminate having excellent impact resistance can be realized.
  • the storage elastic modulus G' of the impact-absorbing layer of the present invention at 25°C is preferably 0.1 GPa or less, more preferably 0.01 MPa to 0.1 GPa. If the storage elastic modulus of the impact-absorbing layer of the present invention is within such a range, there is an advantage that the impact can be absorbed and cracking of the optical layered body can be prevented. Furthermore, a synergistic effect with the thickness effect can also be exhibited.
  • the antistatic layer constituting the optical element of the present invention (hereinafter sometimes referred to as the "antistatic layer of the present invention") is not particularly limited, but for example, a conductive coating liquid containing a conductive polymer is coated. It is the antistatic layer that is formed. Specific coating methods include a roll coating method, a bar coating method, a gravure coating method, and the like.
  • Examples of the conductive polymer include a conductive polymer obtained by doping a ⁇ -conjugated conductive polymer with a polyanion.
  • Examples of ⁇ -conjugated conductive polymers include linear conductive polymers such as polythiophene, polypyrrole, polyaniline, and polyacetylene.
  • Polyanions include polystyrene sulfonic acid, polyisoprene sulfonic acid, polyvinyl sulfonic acid, polyallylsulfonic acid, polyethyl acrylate sulfonic acid, polymethacrylic carboxylic acid and the like.
  • the thickness of the antistatic layer is preferably 1 nm to 1000 nm, more preferably 5 nm to 900 nm.
  • the antistatic layer may consist of only one layer, or may consist of two or more layers.
  • the method for producing the optical laminate of the present invention is not particularly limited, and the adhesive layer, adhesive layer, resin layer, glass layer, hard coat layer, antireflection layer, antiglare layer, An intermediate layer (compatible layer), a shock absorbing layer, etc. can be produced by laminating sequentially on the viewing side of the OLED display panel of the present invention. It can be produced by preparing it in advance and laminating it on the viewing side of the OLED display panel of the present invention.
  • the laminate constituting the optical laminate of the present invention is prepared in advance, it may be the laminate constituting the entire optical laminate of the present invention, or the laminate constituting a part of the optical laminate of the present invention. may be split and laminated on the viewing side of the OLED display panel of the present invention.
  • the layers constituting the optical element of the present invention or the laminate thereof may be protected with a release liner or surface protection film until use.
  • the pressure-sensitive adhesive layer of the present invention may be provided with a release liner on the surface (adhesive surface) of the pressure-sensitive adhesive layer until use.
  • a release liner is used as a protective material for the pressure-sensitive adhesive layer, and is peeled off when applied to an adherend. Note that the release liner does not constitute the optical element of the present invention and may not necessarily be provided.
  • a conventional release paper or the like can be used, and is not particularly limited. etc.
  • the base material having the release treatment layer include plastic films and paper surface-treated with release agents such as silicone, long-chain alkyl, fluorine, and molybdenum sulfide.
  • the fluorine-based polymer in the low-adhesive substrate made of the fluorine polymer include polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, tetrafluoroethylene-hexafluoropropylene copolymer, chloro fluoroethylene-vinylidene fluoride copolymer and the like.
  • the non-polar polymer include olefin resins (eg, polyethylene, polypropylene, etc.).
  • the release liner can be formed by a known or commonly used method. Also, the thickness of the release liner is not particularly limited.
  • the outermost surface (the outermost surface on the viewing side) of the optical layered body of the present invention may be protected with a surface protective film.
  • the surface protection film may be applied by the consumer.
  • the surface protective film does not constitute the optical element of the present invention and may not necessarily be provided.
  • the surface protective film a known or commonly used surface protective film can be used, and although it is not particularly limited, for example, a plastic film having an adhesive layer on its surface can be used.
  • the plastic film include polyester (polyethylene terephthalate, polyethylene naphthalate, etc.), polyolefin (polyethylene, polypropylene, cyclic polyolefin, etc.), polystyrene, acrylic resin, polycarbonate, epoxy resin, fluororesin, silicone resin, diacetate resin, Examples thereof include plastic films formed from plastic materials such as triacetate resin, polyarylate, polyvinyl chloride, polysulfone, polyethersulfone, polyetheretherimide, polyimide, and polyamide.
  • the adhesive layer examples include acrylic adhesives, natural rubber adhesives, synthetic rubber adhesives, ethylene-vinyl acetate copolymer adhesives, ethylene-(meth)acrylic acid ester copolymer adhesives, A pressure-sensitive adhesive layer formed from one or more known or commonly used pressure-sensitive adhesives such as a styrene-isoprene block copolymer-based pressure-sensitive adhesive and a styrene-butadiene block copolymer-based pressure-sensitive adhesive can be used.
  • the pressure-sensitive adhesive layer may contain various additives (eg, antistatic agents, slip agents, etc.).
  • the plastic film and the pressure-sensitive adhesive layer may each have a single-layer structure, or may have a multi-layer (multilayer) structure.
  • the thickness of the surface protective film is not particularly limited, and can be appropriately selected.
  • FIG. 2 is a schematic cross-sectional view showing one embodiment of the basic configuration of an OLED display device laminated with the optical laminate of the present invention.
  • the layers forming the optical laminate 20 are laminated on the visible side of the OLED display panel 100 (upper side in FIG. 2).
  • the OLED display panel 100 is not particularly limited, for example, the same configuration as the OLED display panel 100 shown in FIG. 1 can be adopted.
  • 21 to 29 are layers constituting the optical laminate 20, 21 is an adhesive layer or adhesive layer, 22 is a resin layer, a glass layer or a shock absorbing layer, and 23 is a hard layer.
  • the laminated structure of the optical laminated body 20 shown in FIG. 2 is not limited to this embodiment, and the optical element of the present invention is formed between arbitrary layers of the laminated structure of the optical laminated body 20 shown in FIG. Other layers may be interposed and any layer of the laminate structure of the optical stack 20 shown in FIG. 2 may be absent.
  • 21 is an adhesive layer
  • 22 is a resin layer
  • 23 is a hard coat layer
  • 24 is an adhesive layer
  • 25 is a glass layer
  • 26 is an adhesive layer
  • Resin layer 28 is a hard coat layer
  • antireflection layer 29 is not present, and at least one of adhesive layers 21, 24, and 26 is an adhesive layer having light scattering properties.
  • An OLED display device 300 according to this embodiment is shown in FIG.
  • 31 to 38 are layers constituting the optical laminate 30, 31 is an adhesive layer, 32 is a resin layer, 33 is a hard coat layer, 34 is an adhesive layer, 35 is a glass layer, and 36 is An adhesive layer having light scattering properties, 37 is a resin layer, and 38 is a hard coat layer.
  • an antireflection layer may be present on the visible side of the hard coat layer 38 .
  • FIG. is an adhesive layer
  • 25 is a glass layer
  • 26 is an adhesive layer
  • 27 is a resin layer
  • 28 is a hard coat layer.
  • the pressure-sensitive adhesive layer has a light-scattering property
  • the distance d ( ⁇ m) between the pressure-sensitive adhesive layer having a light-scattering property and the color filter is 700 ⁇ m or less. Since the distance d between the adhesive layer having light scattering properties and the color filter is 700 ⁇ m or less, the light scattering layer is laminated to suppress color shift and interference unevenness caused by the OLED display device 300. Also, image blurring is less likely to occur, and visibility is excellent.
  • the distance between the pressure-sensitive adhesive layer having light scattering properties and the color filter is preferably 600 ⁇ m or less.
  • the thickness is preferably 500 ⁇ m or less, and most preferably, the pressure-sensitive adhesive layer having light scattering properties and the color filter are in direct contact with each other.
  • OLED display devices 400A and 400B according to this embodiment are shown in FIGS. 4(a) and 4(b), respectively.
  • 41A to 48A are layers constituting the optical laminate 40A, 41A is an adhesive layer, 42A is a resin layer, 43A is a hard coat layer, 44A is an adhesive layer, and 45A is a glass layer.
  • 46A is an adhesive layer having light scattering properties
  • 47A is a resin layer
  • 48A is a hard coat layer
  • 15A is a color filter arranged on the viewing side (upper side in FIG. 4A) of the OLED display panel 400B, and the distance d ( ⁇ m) between the adhesive layer 46A having light scattering properties and the color filter 15A. is 700 ⁇ m or less.
  • 41B to 48B are layers constituting the optical laminate 40B, 41B is an adhesive layer having light scattering properties, 42B is a resin layer, 43B is a hard coat layer, and 44B is an adhesive layer.
  • 45B is a glass layer
  • 46B is an adhesive layer
  • 47B is a resin layer
  • 48B is a hard coat layer.
  • the 15B is a color filter arranged on the viewing side (upper side in FIG. 4B) of the OLED display panel 400B.
  • the pressure-sensitive adhesive layer 41B having light scattering properties and the color filter 15B are in direct contact, that is, the distance between the pressure-sensitive adhesive layer 41B having light scattering properties and the color filter 15B is 0 ⁇ m. Color shift and interference unevenness due to 400B can be suppressed most efficiently.
  • an antireflection layer may be present on the visible side of the hard coat layers 48A and 48B.
  • 21 is an adhesive layer
  • 22 is a resin layer
  • 23 is a hard coat layer
  • 24 is an adhesive layer
  • 25 is a glass layer
  • 26 is an adhesive layer
  • 27 is a resin layer
  • 28 is an antiglare layer
  • the antireflection layer 29 is not present.
  • An OLED display device 500 according to this embodiment is shown in FIG.
  • 51 to 58 are layers constituting an optical laminate 50
  • 51 is an adhesive layer
  • 52 is a resin layer
  • 53 is a hard coat layer
  • 54 is an adhesive layer
  • 55 is a glass layer
  • 56 is An adhesive layer
  • 57 is a resin layer
  • 58 is an antiglare layer.
  • the optical layered body 50 has the antiglare layer 58, color shift and interference unevenness caused by the OLED display panel 100 are suppressed, and the OLED display device 500 has excellent visibility.
  • an antireflection layer may be present on the viewing side of the antiglare layer 58 .
  • 21 is an adhesive layer
  • 22 is a resin layer
  • 23 is a hard coat layer
  • 24 is an adhesive layer
  • 25 is a glass layer
  • 26 is an adhesive layer
  • 27 is a resin layer
  • 28 is a hard coat layer
  • an antireflection layer 29 is present.
  • An OLED display device 600 according to this embodiment is shown in FIG.
  • 61 to 69 are layers constituting an optical laminate 60
  • 61 is an adhesive layer
  • 62 is a resin layer
  • 63 is a hard coat layer
  • 64 is an adhesive layer
  • 65 is a glass layer
  • 66 is a glass layer
  • An adhesive layer, 67 is a resin layer
  • 68 is a hard coat layer
  • 69 is an antireflection layer.
  • the optical layered body 60 has the antireflection layer 69, interference unevenness caused by the OLED display panel 100 is suppressed, and the OLED display device 600 has excellent visibility.
  • 68 may be an antiglare layer.
  • the antireflection function is further improved by laminating the antiglare layer 68 and the antireflection layer 69 .
  • 21 is an adhesive layer
  • 22 is a resin layer
  • 23 is absent
  • 24 is an adhesive layer
  • 25 is a glass layer
  • 26 is an adhesive layer
  • 27 is a resin layer
  • 28 is a hard coat layer
  • the antireflection layer 29 is not present.
  • 21 is an adhesive layer
  • 22 is a resin layer
  • 23 is a hard coat layer
  • 24 is an adhesive layer
  • 25 is a glass layer
  • 26 is an adhesive layer
  • 27 is a resin layer
  • 28 is a hard coat layer.
  • the antireflection layer 29 does not exist.
  • OLED display devices 700A and 700B according to this embodiment are shown in FIGS. 7(a) and 7(b), respectively. In FIG.
  • 71A, 72A, 74A to 78A are layers constituting an optical laminate 70A, 71A is an adhesive layer, 72A is a resin layer, 74A is an adhesive layer, 75A is a glass layer, and 76A. is an adhesive layer, 77A is a resin layer, and 78A is a hard coat layer.
  • 71B to 78B are layers constituting the optical laminate 70B, 71B is an adhesive layer, 72B is a resin layer, 73B is a hard coat layer, 74B is an adhesive layer, and 75B is A glass layer, 76B an adhesive layer, 77B a resin layer, and 78B a hard coat layer.
  • FIG. 7B 71B to 78B are layers constituting the optical laminate 70B, 71B is an adhesive layer, 72B is a resin layer, 73B is a hard coat layer, 74B is an adhesive layer, and 75B is A glass layer, 76B an adhesive layer, 77B a resin layer, and
  • the resin layer 72A and the glass layer 75A are adhered by the adhesive layer 74A, or in FIG. 7B, the glass layer 75B and the resin layer 77B are adhered by the adhesive. Bonding by layer 76B imparts excellent impact resistance to each of optical stacks 70A and 70B even if they do not have polarizers.
  • the glass layer is a material that is easily broken and has low flexibility, although it has excellent impact resistance. By bonding the glass layer and the resin layer with an adhesive layer, flexibility and bendability are improved, and the OLED display devices 700A and 700B can be used for flexible devices and foldable devices.
  • an antireflection layer may be present on the visible side of the hard coat layers 78A and 78B.
  • FIG. 8 shows an OLED display device 800 according to this embodiment.
  • 81 to 84, 87, and 88 are layers constituting an optical laminate 80
  • 81 is an adhesive layer
  • 82 is a transparent polyimide layer
  • 83 is a hard coat layer
  • 84 is an adhesive layer
  • 87 is an adhesive layer
  • Resin layer 88 is a hard coat layer.
  • the optical layered body 80 having the transparent polyimide layer 82 and the hard coat layer 83 imparts excellent impact resistance even when the optical layered body 80 does not have a polarizing plate.
  • the optical layered body 80 does not have a glass layer.
  • the glass layer is a material that exhibits high hardness and excellent impact resistance, but is poor in handleability and is difficult to use for large displays used in PCs, tablets, and the like.
  • a transparent polyimide layer and a hard coat layer By laminating a transparent polyimide layer and a hard coat layer, it is possible to achieve a high hardness equivalent to that of a glass layer, and it is also easy to handle, so it can be applied to large displays used in PCs, tablets, etc.
  • an intermediate layer is preferably formed between the transparent polyimide layer 82 and the hard coat layer 83 (not shown).
  • an intermediate layer (compatible layer) is preferably formed between the transparent polyimide layer 82 and the hard coat layer 83.
  • adhesion between the transparent polyimide layer 82 and the hard coat layer 83 is improved.
  • the shear breaking strength between the transparent polyimide layer 82 and the hard coat layer 83 is preferably 20 MPa or more.
  • 900 is an adhesive film
  • 91 is an adhesive layer
  • 92 is a resin layer
  • 93 is a release liner
  • 901 is an OLED display device
  • 91 is an adhesive layer
  • 92 is a resin layer
  • 100 is an OLED display panel.
  • the adhesive film 900 has a form in which an adhesive layer 91 and a resin layer 92 are laminated in this order on the upper side of a release liner 93.
  • the resin layer 92 is not an essential component, it is preferable from the viewpoint of improving impact resistance.
  • a release liner 93 is temporarily attached to the surface of the adhesive layer 91 .
  • the release liner 93 is not particularly limited, for example, a sheet-like base material having a release layer formed on one side with a release treatment agent so that the one side becomes a release surface can be preferably used.
  • the release liner 93 is removed from the surface of the adhesive layer 91, and the exposed surface of the adhesive layer 91 is bonded to the surface of the OLED display panel 100. , the adhesive film 900 is temporarily attached to the OLED display panel 100 .
  • the thickness of the release liner 93 is not particularly limited, it is, for example, 3 to 200 ⁇ m, preferably 10 to 100 ⁇ m.
  • FIG. 9B shows the form in which the adhesive film 900 is temporarily attached to the OLED display panel 100 obtained by the above operation.
  • the adhesive layer 91 of the adhesive film 900 is in contact with the visible side (upper side) of the OLED display panel 100 .
  • the adhesive film 900 without the release liner 93 can also be used.
  • the adhesive surface of the adhesive layer 91 that does not face the resin layer 92 is protected by contacting the surface of the resin layer 92 where the adhesive layer 91 does not exist (roll form). There may be.
  • the adhesive film 900 having a roll shape the surface of the adhesive layer 91 is exposed before being attached to the OLED display panel 100, and the exposed surface of the adhesive layer 91 is attached to the surface of the OLED display panel 100. , the adhesive film 900 is temporarily attached to the OLED display panel 100 .
  • the adhesive layer 91 of the adhesive film 900 temporarily attached to the adherend is subjected to an adhesive strength increasing treatment, whereby the adhesive strength of the adhesive layer 91 increases, and the adherend and the resin layer 92 become adhesive. It is fixed via layer 91 .
  • adherence refers to a state in which two laminated layers are firmly adhered, and separation at the interface between the two is impossible or difficult.
  • Tempoarily adhered means a state in which the adhesive strength between two laminated layers is small and the layers can be easily separated at the interface between them.
  • the adhesive layer 91 preferably has a low moisture permeability, and the resin layer 92 has a high moisture permeability. Moisture permeability is preferred.
  • the adhesive film of the present invention can impart high weather resistance to OLED display devices that do not use polarizing plates.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Polarising Elements (AREA)

Abstract

L'invention concerne un film adhésif qui est susceptible de conférer une résistance aux intempéries à un dispositif d'affichage à DELO qui n'utilise pas de plaque polarisante.　L'invention concerne en particulier un film adhésif pour un dispositif d'affichage à DELO qui est utilisé dans un dispositif d'affichage à DELO dans lequel seul un élément optique présentant un degré de polarisation inférieur ou égal à 95 % est stratifié sur le côté de visualisation d'un élément à DELO, ledit film adhésif comprenant au moins une couche contenant un absorbeur d'ultraviolets en tant que couche constituant l'élément optique et présentant une transmittance inférieure ou égale à 20 % à 380 nm.
PCT/JP2023/006938 2022-02-28 2023-02-27 Film adhésif pour dispositif d'affichage à delo WO2023163146A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022030510A JP2023126056A (ja) 2022-02-28 2022-02-28 Ｏｌｅｄ表示装置用粘着フィルム
JP2022-030510 2022-02-28

Publications (1)

Publication Number Publication Date
WO2023163146A1 true WO2023163146A1 (fr) 2023-08-31

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PCT/JP2023/006938 WO2023163146A1 (fr) 2022-02-28 2023-02-27 Film adhésif pour dispositif d'affichage à delo

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JP (1) JP2023126056A (fr)
TW (1) TW202348415A (fr)
WO (1) WO2023163146A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012211305A (ja) * 2011-03-23 2012-11-01 Mitsubishi Plastics Inc 画像表示装置用透明両面粘着シートおよび画像表示装置
JP2013075978A (ja) * 2011-09-30 2013-04-25 Nitto Denko Corp 粘着シート
JP2021517175A (ja) * 2018-06-05 2021-07-15 エルジー・ケム・リミテッド 粘着剤組成物
JP2021517262A (ja) * 2018-11-30 2021-07-15 エルジー・ケム・リミテッド 光学積層体

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012211305A (ja) * 2011-03-23 2012-11-01 Mitsubishi Plastics Inc 画像表示装置用透明両面粘着シートおよび画像表示装置
JP2013075978A (ja) * 2011-09-30 2013-04-25 Nitto Denko Corp 粘着シート
JP2021517175A (ja) * 2018-06-05 2021-07-15 エルジー・ケム・リミテッド 粘着剤組成物
JP2021517262A (ja) * 2018-11-30 2021-07-15 エルジー・ケム・リミテッド 光学積層体

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JP2023126056A (ja) 2023-09-07

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