WO2022230888A1 - 積層光学フィルム - Google Patents

積層光学フィルム Download PDF

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Publication number
WO2022230888A1
WO2022230888A1 PCT/JP2022/018915 JP2022018915W WO2022230888A1 WO 2022230888 A1 WO2022230888 A1 WO 2022230888A1 JP 2022018915 W JP2022018915 W JP 2022018915W WO 2022230888 A1 WO2022230888 A1 WO 2022230888A1
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Prior art keywords
optical film
meth
adhesive layer
film
acrylate
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Ceased
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PCT/JP2022/018915
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English (en)
French (fr)
Japanese (ja)
Inventor
泰介 笹川
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Nitto Denko Corp
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Nitto Denko Corp
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Priority to KR1020237027589A priority Critical patent/KR20240004225A/ko
Priority to CN202280022929.7A priority patent/CN117098656A/zh
Priority to JP2023517564A priority patent/JPWO2022230888A1/ja
Publication of WO2022230888A1 publication Critical patent/WO2022230888A1/ja
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering

Definitions

  • the present invention relates to a laminated optical film.
  • a display panel has a laminated structure including, for example, a pixel panel, a touch panel, and a surface protective cover.
  • Various functional optical films having predetermined optical functions are also included in the laminated structure of the display panel.
  • Functional optical films include, for example, polarizer films and retardation films.
  • the functional optical film is incorporated in a laminated structure in the form of a laminated optical film, for example, in a state where it is bonded to another optical film such as a protective film via an adhesive.
  • a laminated optical film is described, for example, in Patent Document 1 below.
  • the present invention provides a laminated optical film suitable for suppressing peeling between optical films joined via an adhesive layer even when the adhesive layer is thin when folded.
  • the present invention [1] is a laminated optical film comprising a first optical film, an adhesive layer, and a second optical film in order in the thickness direction, wherein the adhesive layer is bonded to the first optical film. and the indentation elastic modulus M1 at 25° C. of the adhesive layer of the 90° peel strength F1 of the second optical film at 25° C. from the first optical film ( GPa) ratio of 8 or greater.
  • the present invention [2] includes the laminated optical film according to [1] above, wherein the 90° peel strength F1 is 0.8 N/15 mm or more.
  • the present invention [3] includes the laminated optical film according to [1] or [2] above, wherein the indentation modulus M1 is 0.2 GPa or less.
  • the present invention [4] includes the laminated optical film according to any one of [1] to [3] above, wherein the adhesive layer has a thickness of 5 ⁇ m or less.
  • the present invention [5] includes the laminated optical film according to any one of [1] to [4] above, wherein the first optical film is a polarizer film.
  • the 90° peel strength F1 of the second optical film to the first optical film at 25°C and the indentation elastic modulus M1 (GPa) of the adhesive layer at 25°C. is 8 or more.
  • Such a structure balances the compressive stress relaxation property and elastic recovery property of the second optical film side in the adhesive layer that joins the first and second optical films, and ensures good adhesion. Suitable for Therefore, even when the adhesive layer is thin, this laminated optical film is suitable for suppressing peeling between the optical films when the second optical film side is bent inside.
  • FIG. 2 shows a state in which the laminated optical film shown in FIG. 1 is folded.
  • a laminated optical film X as an embodiment of the laminated optical film of the present invention includes, as shown in FIG. (third optical film), an adhesive layer 31 (first adhesive layer), and an adhesive layer 32 (second adhesive layer).
  • the laminated optical film X has a sheet shape with a predetermined thickness and spreads in a direction orthogonal to the thickness direction H (plane direction).
  • the laminated optical film X includes an optical film 21, an adhesive layer 31, an optical film 10, an adhesive layer 32, and an optical film 22 in the thickness direction H in this order.
  • the adhesive layer 31 bonds the optical films 10 and 21 together.
  • the adhesive layer 32 bonds the optical films 10 and 22 together.
  • the laminated optical film X is a composite film incorporated in the laminated structure of the foldable display panel.
  • the laminated optical film X is folded so that the side of the optical film 21 and the adhesive layer 31 faces inside, as shown in FIG.
  • the optical film 21 and the adhesive layer 31 are on the inner side of the bend (lower side in the figure) with respect to the optical film 10
  • the optical film 22 and the adhesive layer 32 are on the outer side of the bend with respect to the optical film 10 (the lower side in the figure). upper middle).
  • the optical film 10 is a functional optical film in this embodiment.
  • Functional optical films include, for example, polarizer films and retardation films.
  • a polarizer film includes, for example, a hydrophilic polymer film that has undergone a dyeing treatment with a dichroic substance and a subsequent stretching treatment.
  • Dichroic substances include, for example, iodine and dichroic dyes.
  • Hydrophilic polymer films include, for example, polyvinyl alcohol (PVA) films, partially formalized PVA films, and partially saponified ethylene-vinyl acetate copolymer films.
  • Polarizer films also include oriented polyene films. Materials for the oriented polyene film include, for example, dehydrated PVA and dehydrochlorinated polyvinyl chloride.
  • a PVA film that has undergone a dyeing treatment with iodine and a subsequent uniaxial stretching treatment is preferable because it has excellent optical properties such as polarizing properties.
  • the thickness of the optical film 10 as a polarizer film is preferably 15 ⁇ m or less, more preferably 12 ⁇ m or less, even more preferably 10 ⁇ m or less, and particularly preferably 8 ⁇ m or less, from the viewpoint of thinning.
  • a thin polarizer film has excellent visibility due to its small thickness unevenness, and is excellent in durability against thermal shock due to its small dimensional change due to temperature change.
  • the thickness of the optical film 10 as a polarizer film is preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more, from the viewpoint of strength.
  • retardation films include ⁇ /2 wavelength films, ⁇ /4 wavelength films, and viewing angle compensation films.
  • Materials for the retardation film include, for example, polymer films birefringent by stretching.
  • Polymeric films include, for example, cellulose films and polyester films.
  • Cellulose films include, for example, triacetyl cellulose films.
  • Polyester films include, for example, polyethylene terephthalate films and polyethylene naphthalate films.
  • the thickness of the optical film 10 as a retardation film is, for example, 20 ⁇ m or more and, for example, 150 ⁇ m or less.
  • a film comprising a substrate such as a cellulose film and an orientation layer of a liquid crystal compound such as a liquid crystalline polymer on the substrate can also be preferably used.
  • the optical films 21 and 22 are transparent protective films, respectively.
  • the transparent protective film is, for example, a flexible transparent resin film.
  • Materials for the transparent protective film include, for example, polyolefin, polyester, polyamide, polyimide, polyvinyl chloride, polyvinylidene chloride, cellulose, modified cellulose, polystyrene, and polycarbonate.
  • Polyolefins include, for example, cycloolefin polymers (COP), polyethylene, polypropylene, ethylene-propylene copolymers, ethylene-vinyl acetate copolymers, and ethylene-vinyl alcohol copolymers.
  • COP cycloolefin polymers
  • Polyesters include, for example, polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate.
  • Polyamides include, for example, polyamide 6, polyamide 6,6, and partially aromatic polyamides. Examples of modified cellulose include triacetyl cellulose. These materials may be used alone, or two or more of them may be used in combination.
  • polyolefin is preferably used, and COP is more preferably used.
  • the material of the optical film 21 and the material of the optical film 22 may be the same or different.
  • the thickness of each of the optical films 21 and 22 is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, and even more preferably 20 ⁇ m or more. From the viewpoint of thinning the laminated optical film X, the thickness of the optical film 21 is preferably 100 ⁇ m or less, more preferably 70 ⁇ m or less, and even more preferably 50 ⁇ m or less. The thickness of the optical film 21 and the thickness of the optical film 22 may be the same or different.
  • the adhesive layer 31 is a cured product of the first adhesive composition.
  • the adhesive layer 31 is directly bonded to the optical film 10 and directly bonded to the optical film 21 .
  • the first adhesive composition contains a curable resin. The components of the first adhesive composition are specifically described below.
  • the thickness T1 of the adhesive layer 31 is preferably 0.1 ⁇ m or more, more preferably 0.4 ⁇ m or more, even more preferably 0.7 ⁇ m or more, and particularly preferably 0.1 ⁇ m or more. .8 ⁇ m or more. From the viewpoint of thinning the laminated optical film X, the thickness T1 of the adhesive layer 31 is preferably 5 ⁇ m or less, more preferably 3 ⁇ m or less, even more preferably 1.5 ⁇ m or less, and particularly preferably 1 ⁇ m or less.
  • the first indentation elastic modulus (indentation elastic modulus M1) of the adhesive layer 31 at 25° C. measured by the nanoindentation method is preferably 0.01 GPa or more, more preferably 0.03 GPa or more, and still more preferably 0. 05 GPa or more, particularly preferably 0.07 GPa or more (the first indentation elastic modulus is the indentation elastic modulus under the first measurement conditions. 1 measurement condition, the maximum indentation depth of the indenter into the measurement sample during the load application process is 200 nm).
  • Such a configuration is preferable for suppressing splitting of the adhesive layer 31 during bending.
  • the indentation modulus M1 is preferably 0.2 GPa or less, more preferably 0.15 GPa or less, even more preferably 0.13 GPa or less, and particularly preferably 0.12 GPa or less.
  • Such a configuration is preferable for relaxing the compressive stress acting on the adhesive layer 31 at the folded portion B when the laminated optical film X is folded so that the optical film 21 side faces inward.
  • the relaxation of the compressive stress of the adhesive layer 31 helps suppress the separation between the optical films 10 and 21 .
  • a method for adjusting the indentation modulus of the adhesive layer 31 includes, for example, adjustment of the composition of the first adhesive composition.
  • adjustment of the number of functional groups of the polymerizable compound described later in the first adhesive composition is a method for adjusting the indentation elastic modulus of the adhesive layer 31. Effective.
  • the nanoindentation method is a technique for measuring various physical properties of samples on a nanometer scale.
  • the nanoindentation method is performed in compliance with ISO14577.
  • a process of pushing an indenter into a sample set on a stage (loading process) and then a process of withdrawing the indenter from the sample (unloading process) are performed.
  • the load acting between the indenter and the sample and the relative displacement of the indenter with respect to the sample are measured (load-displacement measurement). This makes it possible to obtain a load-displacement curve. From this load-displacement curve, it is possible to obtain various physical properties of the measurement sample based on nanometer scale measurements.
  • a nanoindenter (trade name “Triboindenter”, manufactured by Hysitron) can be used for the load-displacement measurement of the cross section of the adhesive layer by the nanoindentation method. Specifically, it is as described later with respect to Examples.
  • the second indentation elastic modulus (indentation elastic modulus M2) of the adhesive layer 31 at 25° C. measured by the nanoindentation method is preferably 0.5 GPa or more, more preferably 1 GPa or more, and still more preferably 1.5 GPa. As described above, it is particularly preferably 2 GPa or more (the second indentation elastic modulus is the indentation elastic modulus under the second measurement conditions.
  • the second measurement conditions are as described later with respect to the examples, and the second measurement conditions , the maximum indentation depth of the indenter with respect to the measurement sample during the load application process is 50 nm). Such a configuration is preferable for suppressing splitting of the adhesive layer 31 during bending.
  • the indentation modulus M2 is preferably 8.2 GPa or less, more preferably 7 GPa or less, even more preferably 6 GPa or less, and particularly preferably 5.2 GPa or less. Such a configuration is preferable for relaxing the compressive stress acting on the adhesive layer 31 at the folded portion B when the laminated optical film X is folded so that the optical film 21 side faces inward.
  • the 90° peel strength F1 of the optical film 21 to the optical film 10 at 25°C is preferably 0.8 N/15 mm or more, more preferably 1 N/15 mm or more, and still more preferably 1.2 N/15 mm. More preferably, it is 1.5 N/15 mm or more.
  • Such a configuration is preferable for ensuring good bonding strength between the optical films 10 and 21.
  • the 90° peel strength F1 is, for example, 10 N/15 mm or less. The 90° peel strength F1 can be measured by the method described below with respect to the examples.
  • the peel strength of the optical film 21 to the optical film 10 is the force required to peel the optical film 21 from the optical film 10, and the peeling includes interfacial peeling and adhesion between the optical film 10 and the adhesive layer 31. Delamination due to cohesive failure of the adhesive layer 31, interfacial delamination between the adhesive layer 31 and the optical film 21, and delamination due to a combination thereof are included.
  • a method for adjusting the 90° peel strength F1 for example, adjustment of the composition of the first adhesive composition can be mentioned.
  • adjustment of the number of functional groups of the polymerizable compound described later in the first adhesive composition that is, adjustment of the acrylic equivalent or epoxy equivalent of the polymerizable compound, mentioned.
  • the ratio (F1/M1) of the 90° peel strength F1 (N/15mm) to the indentation modulus M1 (GPa) described above is 8 or more.
  • Such a configuration is suitable for balancing the compressive stress relaxation property and elastic recovery property of the optical film 21 side in the adhesive layer 31 that joins the optical films 10 and 21 . Therefore, even when the adhesive layer 31 is thin, the laminated optical film X prevents the separation between the optical films 10 and 21 at the bent portion B when the optical film 21 side is bent inside. , suitable for suppressing. Concretely, it is as shown in the examples below.
  • the ratio (F1/M1) is preferably 8.5 or more, more preferably 9 or more, even more preferably 10 or more, and particularly preferably 12 or more.
  • Such a configuration is preferable for relaxing the compressive stress acting on the adhesive layer 31 at the folded portion B when the laminated optical film X is folded so that the optical film 21 side faces inward.
  • the relaxation of the compressive stress of the adhesive layer 31 helps suppress the separation between the optical films 10 and 21 .
  • the ratio (F1/M1) is, for example, 30 or less, preferably 25 or less.
  • Such a configuration is preferable for ensuring elastic recovery of the adhesive layer 31 . Ensuring elastic recovery of the adhesive layer 31 suppresses stress concentration at the bent portion B and helps suppress peeling between the optical films 10 and 21 .
  • the ratio (F1/M2) of the 90° peel strength F1 (N/15mm) to the indentation modulus M2 (GPa) is preferably 0.2 or more, more preferably 0.3 or more, and still more preferably 0.4. That's it. Such a configuration is preferable for relaxing the compressive stress acting on the adhesive layer 31 at the folded portion B when the laminated optical film X is folded so that the optical film 21 side faces inward.
  • the ratio (F1/M2) is preferably 5 or less, more preferably 3 or less, even more preferably 2 or less. Such a configuration is preferable for ensuring elastic recovery of the adhesive layer 31 .
  • the ratio (F1/M1) indicates the balance between the height of such indentation elastic modulus M1 in the adhesive layer 31 and the magnitude of the 90° peel strength F1 described above.
  • the ratio (F1/M1) is 8 or more, the optical films 10 and 21 are separated from each other against the peeling force acting on the adhesive layer 31 at the folded portion B when the laminated optical film X is folded. Suitable for suppressing peeling.
  • Methods for adjusting the ratio (F1/M1) include adjusting the indentation modulus M1 and adjusting the 90° peel strength F1.
  • the adhesive layer 32 is a cured product of the second adhesive composition.
  • the adhesive layer 32 bonds directly to the optical film 10 and directly bonds to the optical film 22 .
  • the second adhesive composition contains a curable resin. The components of the second adhesive composition are specifically described below.
  • the thickness T2 of the adhesive layer 32 is preferably 0.1 ⁇ m or more, more preferably 0.4 ⁇ m or more, even more preferably 0.7 ⁇ m or more, and particularly preferably 0 .8 ⁇ m or more.
  • the thickness T2 of the adhesive layer 32 is preferably 5 ⁇ m or less, more preferably 3 ⁇ m or less, even more preferably 1.5 ⁇ m or less, and particularly preferably 1 ⁇ m or less.
  • the thickness T2 of the adhesive layer 32 and the thickness T1 of the adhesive layer 31 may be the same or different.
  • the ratio (T2/T1) of the thickness T2 to the thickness T1 is, for example, 0.02 or more, preferably 0.1 or more, and is, for example, 50 or less, preferably 7.5 or less.
  • the 180° peel strength F2 of the optical film 22 to the optical film 10 at 25°C is preferably 1.0 N/15 mm or more, more preferably 1.5 N/15 mm or more, and still more preferably 2.0 N. /15 mm or more.
  • Such a configuration is preferable for ensuring good bonding strength between the optical films 10 and 22, especially when the laminated optical film X is folded so that the optical film 21 side faces inside (the case shown in FIG. 2). ) to ensure the bonding strength between the optical films 10 and 22 at the bent portion B.
  • the 180° peel strength F2 is, for example, 5.0 N/15 mm or less.
  • the 180° peel strength F2 can be measured in the same manner as the peel strength measurement method described later with regard to Examples, except that the peel angle is 180° instead of 90°. Moreover, as a method for adjusting the 180° peel strength F2, for example, adjustment of the composition of the second adhesive composition can be mentioned. As a method for adjusting the 180° peel strength F2, specifically, adjustment of the number of functional groups of the polymerizable compound described later in the second adhesive composition, that is, adjustment of the acrylic equivalent or epoxy equivalent of the polymerizable compound, mentioned.
  • the ratio (F1/F2) of the 90° peel strength F1 (N/15mm) to the 180° peel strength F2 (N/15mm) is preferably 1.0 or more, more preferably 1.2 or more, and still more preferably 1.2 or more. 5 or more.
  • the ratio (F1/F2) is preferably 4.0 or less, more preferably 2.5 or less, still more preferably 2.0 or less. These configurations are intended to achieve both suppression of peeling between the optical films 10 and 21 and suppression of peeling between the optical films 10 and 22 when the laminated optical film X is folded so that the optical film 22 side faces inside.
  • Methods for adjusting the ratio (F1/F2) include adjustment of the 90° peel strength F1 and adjustment of the 180° peel strength F2.
  • the adhesive layer 31 is, for example, a cured product of a first adhesive composition (first active energy ray-curable composition) containing an active energy ray-curable resin.
  • first active energy ray-curable composition examples include electron beam-curable compositions, UV-curable compositions, and visible light-curable compositions.
  • the first active energy ray-curable composition is either one or both of a radically polymerizable composition and a cationic polymerizable composition in the present embodiment.
  • a radically polymerizable composition contains a radically polymerizable compound as a monomer.
  • a radically polymerizable compound is a compound having a radically polymerizable functional group.
  • examples of radically polymerizable functional groups include ethylenically unsaturated bond-containing groups.
  • Ethylenically unsaturated bond-containing groups include, for example, (meth)acryloyl groups, vinyl groups, and allyl groups.
  • a (meth)acryloyl group means an acryloyl group and/or a methacryloyl group.
  • the first active energy ray-curable composition preferably contains a radically polymerizable compound having a (meth)acryloyl group as a main component.
  • a main component means the component with the largest mass ratio.
  • the proportion of the (meth)acryloyl group-containing radically polymerizable compound in the first active energy ray-curable composition is, for example, 50% by mass or more, preferably 70% by mass or more, and more preferably 80% by mass or more.
  • the radically polymerizable compound includes a monofunctional radically polymerizable compound and a difunctional or higher polyfunctional radically polymerizable compound.
  • Examples of monofunctional radically polymerizable compounds include (meth)acrylamide derivatives having a (meth)acrylamide group.
  • (Meth)acrylamide derivatives include N-alkyl group-containing (meth)acrylamide derivatives, N-hydroxyalkyl group-containing (meth)acrylamide derivatives, N-aminoalkyl group-containing (meth)acrylamide derivatives, N-alkoxy group-containing (meth)acrylamide derivatives, ) acrylamide derivatives and N-mercaptoalkyl group-containing (meth)acrylamide derivatives.
  • N-alkyl group-containing (meth)acrylamide derivatives include, for example, N-methyl(meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropyl(meth)acrylamide , N-butyl(meth)acrylamide, and N-hexyl(meth)acrylamide, preferably N,N-diethylacrylamide is used.
  • N-hydroxyalkyl group-containing (meth)acrylamide derivatives include, for example, N-methylol(meth)acrylamide, N-hydroxyethyl(meth)acrylamide, and N-methylol-N-propane(meth)acrylamide, preferably is N-hydroxyethyl acrylamide.
  • the (meth)acrylamide derivatives may be used alone, or two or more of them may be used in combination.
  • Examples of monofunctional radically polymerizable compounds include (meth)acrylic acid derivatives having a (meth)acryloyloxy group.
  • Examples of the (meth)acrylic acid derivative include (meth)acrylic acid alkyl esters and (meth)acrylic acid derivatives other than (meth)acrylic acid alkyl esters.
  • the (meth)acrylic acid derivatives may be used alone, or two or more of them may be used in combination.
  • (Meth)acrylic acid alkyl esters include, for example, methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, ) acrylate, n-pentyl (meth) acrylate, 2,2-dimethylbutyl (meth) acrylate, n-hexyl (meth) acrylate, n-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 4-methyl- 2-propylpentyl (meth)acrylate, and n-octadecyl (meth)acrylate.
  • Examples of (meth)acrylic acid derivatives other than (meth)acrylic acid alkyl esters include (meth)acrylic acid cycloalkyl esters, (meth)acrylic acid aralkyl esters, hydroxyl group-containing (meth)acrylic acid derivatives, alkoxy group-containing ( Examples include meth)acrylic acid derivatives and phenoxy group-containing (meth)acrylic acid derivatives.
  • (Meth)acrylic acid cycloalkyl esters include, for example, cyclohexyl (meth)acrylate and cyclopentyl (meth)acrylate.
  • (Meth)acrylic acid aralkyl esters include, for example, benzyl (meth)acrylate and 3-phenoxybenzyl (meth)acrylate.
  • hydroxyl group-containing (meth)acrylic acid derivatives include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 4 -hydroxybutyl (meth)acrylate, [4-(hydroxymethyl)cyclohexyl]methyl acrylate, and 2-hydroxy-3-phenoxypropyl (meth)acrylate.
  • Alkoxy group-containing (meth)acrylic acid derivatives include, for example, 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, and 3-methoxybutyl (meth)acrylate.
  • Phenoxy group-containing (meth)acrylic acid derivatives include, for example, phenoxyethyl (meth)acrylate and phenoxydiethylene glycol (meth)acrylate.
  • the (meth)acrylic acid derivative other than the (meth)acrylic acid alkyl ester is preferably at least one selected from the group consisting of 3-phenoxybenzyl acrylate, 2-hydroxy-3-phenoxypropyl acrylate, and phenoxydiethylene glycol acrylate. one is used.
  • Carboxyl group-containing monomers are also included as monofunctional radically polymerizable compounds.
  • Carboxyl group-containing monomers include, for example, (meth)acrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, and isocrotonic acid.
  • the monofunctional radically polymerizable compound also includes a lactam-based vinyl monomer.
  • Lactamic vinyl monomers include, for example, N-vinyl-2-pyrrolidone, N-vinyl- ⁇ -caprolactam, and methylvinylpyrrolidone.
  • Examples of monofunctional radically polymerizable compounds include vinyl-based monomers having nitrogen-containing heterocycles.
  • Such monomers include, for example, vinylpyridine, vinylpiperidone, vinylpyrimidine, vinylpiperazine, vinylpyrazine, vinylpyrrole, vinylimidazole, vinyloxazole, acryloylmorpholine, and vinylmorpholine.
  • polyfunctional radically polymerizable compounds include tripropylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate.
  • acrylate 1,10-decanediol diacrylate, 2-ethyl-2-butylpropanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, tricyclodecanedimethanol di(meth)acrylate, cyclic Trimethylolpropane formal (meth)acrylate, dioxane glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate acrylates, dipentaerythritol hexa(meth)acrylate, and neopentylglycol hydroxypivalate acrylic acid adducts.
  • the polyfunctional radically polymerizable compound is preferably at least one selected from the group consisting of tripropylene glycol diacrylate, 1,9-nonanediol diacrylate, and neopentyl glycol hydroxypivalate acrylic acid adduct. one is used.
  • the polyfunctional radically polymerizable compounds may be used alone, or two or more of them may be used in combination.
  • a polyfunctional radically polymerizable compound functions as a cross-linking agent.
  • the first active energy ray-curable composition contains a photopolymerization initiator.
  • Photoinitiators include, for example, benzophenone compounds, benzoin ether compounds, and thioxanthone compounds.
  • Benzophenone compounds include, for example, benzyl, benzophenone, benzoylbenzoic acid, and 3,3'-dimethyl-4-methoxybenzophenone.
  • Benzoin ether compounds include, for example, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzoin butyl ether.
  • Thioxanthone compounds include, for example, thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-dichlorothioxanthone, 2,4-diethylthioxanthone, 2,4-diisopropylthioxanthone, and dodecylthioxanthone.
  • a photopolymerization initiator that is highly sensitive to light of 380 nm or longer is preferably used.
  • photopolymerization initiators include, for example, 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1-(4-morphol linophenyl)-butanone-1,2-(dimethylamino)-2-[(4-methylphenyl)methyl]-1-[4-(4-morpholinyl)phenyl]-1-butanone, 2,4,6- trimethylbenzoyl-diphenyl-phosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, and bis( ⁇ 5-2,4-cyclopentadien-1-yl)-bis(2,6-difluoro -3-(1H-pyrrol-1-yl)
  • 2,4-diethylthioxanthone and/or 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one are preferably used.
  • the content of the photopolymerization initiator in the first active energy ray-curable composition is preferably 0.1 parts by mass or more, more preferably 0.05 parts by mass, with respect to 100 parts by mass of the curable component (radical polymerizable compound). It is at least 0.1 part by mass, more preferably at least 0.1 part by mass, and is preferably at most 20 parts by mass, more preferably at most 10 parts by mass, and even more preferably at most 5 parts by mass.
  • the composition contains a cationic polymerizable compound as a monomer.
  • the cationically polymerizable compound is a compound having a cationically polymerizable functional group, and includes a monofunctional cationically polymerizable compound having one cationically polymerizable functional group and a polyfunctional cationically polymerizable compound having two or more cationically polymerizable functional groups. compounds.
  • a monofunctional cationic polymerizable compound has a relatively low liquid viscosity. By adding such a monofunctional cationically polymerizable compound to the resin composition, the viscosity of the resin composition can be lowered.
  • monofunctional cationically polymerizable compounds often have functional groups that exhibit various functions.
  • various functions can be expressed in the resin composition and/or the cured product of the resin composition.
  • the resin composition containing the polyfunctional cationically polymerizable compound by curing the resin composition containing the polyfunctional cationically polymerizable compound, a cured product having a three-dimensional crosslinked portion is obtained (the polyfunctional cationically polymerizable compound functions as a crosslinking agent). From such a point of view, it is preferable to use polyfunctional cationically polymerizable compounds.
  • the amount of the polyfunctional cationically polymerizable compound relative to 100 parts by weight of the monofunctional cationically polymerizable compound is, for example, 10 parts by weight or more. It is 1000 mass parts or less.
  • Cationic polymerizable functional groups include, for example, epoxy groups, oxetanyl groups, and vinyl ether groups.
  • Compounds having an epoxy group include, for example, aliphatic epoxy compounds, alicyclic epoxy compounds, and aromatic epoxy compounds.
  • an alicyclic epoxy compound is preferably used from the viewpoint of curability and adhesiveness of the cationic polymerizable composition.
  • the alicyclic epoxy compounds include, for example, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, or caprolactone-modified 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, Examples include trimethylcaprolactone-modified products and valerolactone-modified products.
  • Examples of commercially available alicyclic epoxy compounds include Celoxide 2021, Celoxide 2021A, Celoxide 2021P, Celoxide 2081, Celoxide 2083, and Celoxide 2085 (manufactured by Daicel Chemical Industries, Ltd.), and Cyracure UVR-6105.
  • Cyracure UVR-6107 Cyracure 30, and R-6110 (manufactured by Dow Chemical Japan). From the viewpoint of improving curability and reducing viscosity of the cationic polymerizable composition, it is preferable to use a compound having an oxetanyl group and/or a compound having a vinyl ether group.
  • Compounds having an oxetanyl group include, for example, 3-ethyl-3-hydroxymethyloxetane, 1,4-bis[(3-ethyl-3-oxetanyl)methoxymethyl]benzene, 3-ethyl-3-(phenoxymethyl) oxetane, di[(3-ethyl-3-oxetanyl)methyl]ether, 3-ethyl-3-(2-ethylhexyloxymethyl)oxetane, and phenol novolac oxetane.
  • oxetanyl group examples include, for example, Aron oxetane OXT-101, Aron oxetane OXT-121, Aron oxetane OXT-211, Aron oxetane OXT-221, and Aron oxetane OXT-212 (manufactured by Toagosei Co., Ltd.). is mentioned.
  • Examples of compounds having a vinyl ether group include 2-hydroxyethyl vinyl ether, diethylene glycol monovinyl ether, 4-hydroxybutyl vinyl ether, diethylene glycol vinyl ether, triethylene glycol divinyl ether, cyclohexanedimethanol divinyl ether, cyclohexanedimethanol monovinyl ether, tricyclo.
  • the active energy ray curable composition When the active energy ray-curable composition is an ultraviolet curable composition or a visible light curable composition, the active energy ray curable composition contains a photocationic polymerization initiator.
  • a photocationic polymerization initiator generates cationic species or Lewis acid upon irradiation with active energy rays (visible light, ultraviolet rays, X-rays, electron beams, etc.) and initiates the polymerization reaction of the cationic polymerizable functional groups.
  • the photocationic polymerization initiator includes a photoacid generator and a photobase generator, preferably a photoacid generator.
  • the active energy ray-curable composition is used as a visible light-curable composition
  • a cationic photopolymerization initiator that is particularly sensitive to light of 380 nm or longer.
  • a photocationic polymerization initiator it is preferable to use together a photosensitizer showing maximum absorption of light having a wavelength longer than 380 nm.
  • a photocationic polymerization initiator is generally a compound that exhibits maximum absorption in a wavelength region near or shorter than 300 nm. Long wavelength light can be effectively used to promote the generation of cationic species or Lewis acids from the photocationic polymerization initiator.
  • photosensitizers include anthracene compounds, pyrene compounds, carbonyl compounds, organic sulfur compounds, persulfides, redox compounds, azo compounds, diazo compounds, halogen compounds, and photoreducible dyes. These may be used alone, or two or more of them may be used in combination. In particular, an anthracene compound is preferable because of its excellent photosensitizing effect.
  • commercially available anthracene compounds as photosensitizers include, for example, Anthracure UVS-1331 and Anthracure UVS-1221 (manufactured by Kawasaki Kasei Co., Ltd.). The content of the photosensitizer in the composition is, for example, 0.1 to 5% by weight.
  • the first active energy ray-curable composition may contain an oligomer.
  • Oligomers include acrylic oligomers, fluorine oligomers, and silicone oligomers, preferably acrylic oligomers.
  • the addition of the oligomer to the first active energy ray-curable composition is useful for adjusting the viscosity of the composition and for suppressing the shrinkage of the composition during curing. Suppression of curing shrinkage of the first active energy ray-curable composition is preferable for reducing interfacial stress between the formed adhesive layer 31 and the optical films 10 and 21 . Suppression of interfacial stress is useful for securing bonding strength between the optical films 10 and 21 .
  • Examples of (meth)acrylic monomers that form acrylic oligomers include (meth)acrylic acid alkyl esters having 1 to 20 carbon atoms, cycloalkyl (meth)acrylates, aralkyl (meth)acrylates, polycyclic (meth)acrylates, Examples include hydroxyl group-containing (meth)acrylic acid esters and halogen-containing (meth)acrylic acid esters.
  • (Meth)acrylic acid alkyl esters for example, methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, 2-methyl-2-nitropropyl (meth)acrylate , n-butyl (meth)acrylate, isobutyl (meth)acrylate, S-butyl (meth)acrylate, t-butyl (meth)acrylate, n-pentyl (meth)acrylate, t-pentyl (meth)acrylate, 3-pentyl (Meth)acrylate, 2,2-dimethylbutyl (meth)acrylate, n-hexyl (meth)acrylate, cetyl (meth)acrylate, n-octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, 4-methyl- 2-propylpentyl (meth)acrylate
  • Cycloalkyl (meth)acrylates include, for example, cyclohexyl (meth)acrylate and cyclopentyl (meth)acrylate.
  • Aralkyl (meth)acrylates include, for example, benzyl (meth)acrylate.
  • Polycyclic (meth)acrylates include, for example, 2-isobornyl (meth)acrylate, 2-norbornylmethyl (meth)acrylate, 5-norbornen-2-yl-methyl (meth)acrylate, and 3-methyl- 2-Norbornylmethyl (meth)acrylate can be mentioned.
  • hydroxyl group-containing (meth)acrylic acid esters examples include hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and 2,3-dihydroxypropylmethyl-butyl (meth)methacrylate.
  • Halogen-containing (meth)acrylic acid esters include, for example, 2,2,2-trifluoroethyl (meth)acrylate, 2,2,2-trifluoroethylethyl (meth)acrylate, tetrafluoropropyl (meth)acrylate, hexafluoropropyl (meth)acrylate, octafluoropentyl (meth)acrylate, heptadecafluorodecyl (meth)acrylate. These (meth)acrylates may be used alone, or two or more of them may be used in combination.
  • the weight average molecular weight (Mw) of the acrylic oligomer is preferably 15,000 or less, more preferably 10,000 or less, even more preferably 5,000 or less. Mw of the acrylic oligomer is preferably 500 or more, more preferably 1000 or more, and even more preferably 1500 or more.
  • the content of the acrylic oligomer in the first active energy ray-curable composition is preferably 2% by mass or more, more preferably 4% by mass or more, and is preferably 20% by mass or less, more preferably 15% by mass or less. is.
  • the first active energy ray-curable composition may contain other components.
  • Other ingredients include silane coupling agents, leveling agents, surfactants, plasticizers, and UV absorbers.
  • the blending amount of the other component is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, and still more preferably 3 parts by mass or less with respect to 100 parts by mass of the curable component. Part by mass or more.
  • the viscosity of the first active energy ray-curable composition at 25° C. is preferably 3 mPa ⁇ s or more, more preferably 5 mPa ⁇ s or more, and still more preferably 10 mPa ⁇ s, from the viewpoint of coatability in the coating step described later. s or more, preferably 100 mPa ⁇ s or less, more preferably 50 mPa ⁇ s or less, and still more preferably 30 mPa ⁇ s or less.
  • the viscosity of the composition is a value measured with an E-type viscometer (cone plate type viscometer).
  • the adhesive layer 32 is, for example, a cured product (active energy ray-curable composition) of a second adhesive composition containing an active energy ray-curable curable resin.
  • the second active energy ray-curable composition include electron beam-curable compositions, UV-curable compositions, and visible light-curable compositions.
  • the second active energy ray-curable composition and the first active energy ray-curable composition may be the same type of composition, or may be different types of compositions.
  • a 2nd active-energy-ray-curable composition is a radically polymerizable composition in this embodiment.
  • the components contained in the second active energy ray-curable composition As the components contained in the second active energy ray-curable composition, the components described above as the components contained in the first active energy ray-curable composition can be used.
  • the range of content of the components of the second active energy ray-curable composition is the same as the range of content of the components of the first active energy ray-curable composition.
  • the composition of the second active energy ray-curable composition and the composition of the first active energy ray-curable composition may be the same or different.
  • the laminated optical film X can be produced, for example, as follows.
  • a first active energy ray-curable composition is applied to one side (to-be-bonded surface) of the optical film 21 to form a first coating film of the composition (first coating step).
  • the second active energy ray-curable composition is applied to one surface (to-be-bonded surface) of the optical film 22 to form a second coating film of the same composition (second application step).
  • the surface to be bonded of the optical film may be subjected to a surface modification treatment.
  • Surface modification treatments include corona treatment, plasma treatment, excimer-treatment, and flame treatment. Examples of coating methods in this step include reverse coaters, gravure coaters, bar reverse coaters, roll coaters, die coaters, bar coaters, and rod coaters.
  • the optical film 21 is attached to one surface of the optical film 10 via the first coating film
  • the optical film 22 is attached to the other surface of the optical film 10 via the second coating film.
  • lamination for example, a roll laminator that performs both lamination simultaneously can be used.
  • the first coating film and the second coating film are irradiated with active energy rays, the first coating film is cured to form the adhesive layer 31, and the second coating film is cured to form the adhesive layer 32 (adhesive layers 31, 32 are not pressure sensitive adhesive layers).
  • the optical films 10 and 21 are bonded via the adhesive layer 31 and the optical films 10 and 22 are bonded via the adhesive layer 32 .
  • the active energy ray for curing the first coating is irradiated from the optical film 21 side, and the second coating is irradiated from the optical film 22 side.
  • An active energy ray for film hardening is applied.
  • Electron beams, ultraviolet rays, and visible rays can be used as active energy rays.
  • Examples of electron beam irradiation means include an electron beam accelerator.
  • Ultraviolet and visible light sources include, for example, LED lights, gallium-filled metal halide lamps, low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultra-high pressure mercury lamps, xenon lamps, halogen lamps, and gallium lamps.
  • a wavelength cut filter for cutting a part of the wavelength range of ultraviolet rays and/or visible light emitted from the light source may be used as needed.
  • the laminated optical film X can be produced, for example, as described above.
  • Example 1 The following components were mixed at 25° C. for 1 hour at the blending amounts (solid content blending amounts) shown in Table 1 to prepare an adhesive composition (preparation step).
  • the units for the amounts shown in Table 1 are relative "parts by weight”.
  • Alfon 1190 (acrylic oligomer): viscosity 6000 mPa s (25 ° C.), Mw 1700, Tg -50 ° C., Toagosei BYK-UV3505 (leveling agent): modified poly having an acrylic group Dimethylsiloxane, manufactured by BYK
  • the application process was carried out. Specifically, it is as follows. An adhesive composition is applied onto a 23 ⁇ m thick COP film (product name “Zeonor Film ZF14”, manufactured by Nippon Zeon Co., Ltd.) as the first transparent protective film to form a 1 ⁇ m thick first adhesive coating film. did. On the other hand, the adhesive composition is applied onto a 23 ⁇ m thick COP film (product name “Zeonor Film ZF14”, manufactured by Nippon Zeon Co., Ltd.) as a second transparent protective film to form a second adhesive coating film of 1 ⁇ m thick. formed. For each coating, an MCD coater (manufactured by Fuji Kikai Co., Ltd., cell shape: honeycomb, gravure roll line number: 1000 lines/inch, rotation speed: 140%/line speed) was used.
  • the first transparent protective film with the first adhesive coating, the polarizer film, and the second transparent protective film with the second adhesive coating were laminated together (lamination step). Specifically, with a roll laminator, while bonding the first adhesive coating side of the first transparent protective film to one surface of the polarizer film, the second transparent protective film of the second transparent protective film is laminated to the other surface of the polarizer film. 2 The adhesive coating film side was pasted together.
  • the second adhesive coating film is irradiated with ultraviolet rays from the second transparent protective film side, thereby was cured (curing step).
  • an ultraviolet irradiation apparatus product name: "Light HAMMER10", bulb: V bulb, manufactured by Fusion UV Systems, Inc.
  • a gallium-encapsulated metal halide lamp as a light source was used.
  • the peak illuminance was 1600 mW/cm 2 and the cumulative irradiance was 1000 mJ/cm 2 (wavelength 380 to 440 nm) (illuminance was measured using the “Sola-Check system” manufactured by Solatell. ).
  • the first transparent protective film and the polarizer film and the second transparent protective film and the polarizer film were joined to obtain a laminated optical film.
  • the laminated optical film of Example 1 was produced as described above.
  • the laminated optical film of Example 1 includes a first transparent protective film (23 ⁇ m thick), a first adhesive layer, a polarizer film (5 ⁇ m thick), a second adhesive layer, and a second transparent protective film. (thickness 23 ⁇ m) are provided in this order in the thickness direction.
  • Example 2 The laminated optical film of Example 2 (first transparent protective film/first adhesive layer/polarizer film/second adhesive layer/second transparent film) was prepared in the same manner as the laminated optical film of Example 1 except for the following. Protective film) was produced.
  • an adhesive composition was prepared with the composition shown in Table 1.
  • the monomers instead of “light acrylate POB-A” and “light acrylate P2H-A", "Light acrylate 1.9ND-A” (1,9-nonanediol diacrylate) manufactured by Kyoeisha Chemical Co., Ltd.
  • "Light Acrylate HPP-A” neopentyl glycol hydroxypivalate acrylic acid adduct) manufactured by Kagaku Co., Ltd. was used.
  • the thickness of the first adhesive layer coating film formed on the first transparent protective film was set to 2.3 ⁇ m
  • the thickness of the second adhesive layer coating film formed on the second transparent protective film was set to 2.3 ⁇ m. The thickness was set to 2.3 ⁇ m.
  • Example 3 The laminated optical film of Example 3 (first transparent protective film/first adhesive layer/polarizer film/second adhesive layer/second transparent film) was prepared in the same manner as the laminated optical film of Example 1 except for the following. Protective film) was produced.
  • an adhesive composition was prepared with the composition shown in Table 1.
  • Acryloylmorpholine product name: "ACMO-LI", manufactured by KJ Chemicals
  • the thickness of the first adhesive layer coating formed on the first transparent protective film was 0.8 ⁇ m
  • the thickness of the second adhesive layer coating formed on the second transparent protective film was 0.8 ⁇ m. The thickness was set to 0.8 ⁇ m.
  • Example 4 The laminated optical film of Example 4 (first transparent protective film/first adhesive layer/polarizer film/second adhesive layer/second transparent film) was prepared in the same manner as the laminated optical film of Example 1 except for the following. Protective film) was produced.
  • the blending amount of “light acrylate POB-A” was 43 parts by mass
  • the blending amount of “light acrylate P2H-A” was 29 parts by mass
  • the blending amount of “Aronix M-220” was 3 parts by mass. did.
  • the thickness of the first adhesive layer coating formed on the first transparent protective film is 0.7 ⁇ m
  • the thickness of the second adhesive layer coating formed on the second transparent protective film was set to 0.7 ⁇ m.
  • Comparative Example 1 The laminated optical film of Comparative Example 1 (first transparent protective film/first adhesive layer/polarizer film/second adhesive layer/second transparent film) was prepared in the same manner as the laminated optical film of Example 2 except for the following. Protective film) was produced.
  • the blending amount of "light acrylate 1.9ND-A” was set to 40 parts by mass, and the blending amount of "light acrylate HPP-A” was set to 9 parts by mass.
  • the thickness of the first adhesive layer coating formed on the first transparent protective film was set to 0.8 ⁇ m, and the thickness of the second adhesive layer coating formed on the second transparent protective film was set to 0.8 ⁇ m.
  • each adhesive layer in each laminated optical film of Examples 1 to 4 and Comparative Example 1 was measured as follows. First, a 5 mm ⁇ 10 mm film piece (laminated optical film) was cut out from the laminated optical film. Next, the laminated optical film was cut by a cryomicrotome method. Specifically, the laminated optical film was cooled to ⁇ 30° C., cut with a hard knife in the thickness direction of the same film, and then returned to room temperature. Next, the cut surface of the laminated optical film thus formed with the cut surface was subjected to a conductive treatment with a thickness of 5 nm or less. Thus, an observation sample was obtained. Next, the thickness of the adhesive layer was measured by SEM observation of the observation sample.
  • the 90° peel strength (N/15 mm) of the first transparent protective film from the polarizer film was measured using a Tensilon universal tester (product name: "RTC", manufactured by A&D).
  • RTC Tensilon universal tester
  • the first chuck provided in the Tensilon universal testing machine is made to grip the glass plate and the sample film from the glass plate to the polarizer film, and the second chuck provided in the same tester is used to hold the first transparent protection of the sample film. I grabbed the film.
  • the measurement temperature was 25° C.
  • the peeling angle was 90°
  • the peeling speed was 1000 mm/min.
  • Table 2 shows the measured 90° peel strength F1 (N/15 mm).
  • ⁇ Indentation modulus> The elastic modulus of the first adhesive layer in each of the laminated optical films of Examples 1 to 4 and Comparative Example 1 was examined by the nanoindentation method. Specifically, first, a 5 mm ⁇ 10 mm film piece (laminated optical film) was cut out from the laminated optical film. Next, the laminated optical film was cut by a cryomicrotome method. Specifically, the laminated optical film was cooled to ⁇ 30° C., cut with a hard knife in the thickness direction of the same film, and then returned to room temperature. Thus, a sample for measurement was obtained.
  • the load-displacement measurement on the exposed surface of the first adhesive layer in the measurement sample was carried out in accordance with JIS Z 2255:2003. , to obtain the load-displacement curve.
  • the measurement mode is single indentation measurement
  • the measurement temperature is 25 ° C.
  • the indenter used is a Berkovich (triangular pyramid) type diamond indenter
  • the maximum indentation depth maximum The displacement hmax) was 200 nm
  • the indentation speed was 10 nm/sec
  • the indenter withdrawal speed was 10 nm/sec during the unloading process (first measurement condition).
  • load-displacement measurement was performed using a nanoindenter under the same measurement conditions as the first measurement conditions (second measurement conditions) except that the maximum indentation depth was changed from 200 nm to 50 nm. Then, the obtained measurement data was processed by the dedicated analysis software (Ver. 9.4.0.1) of "TI950 Triboindenter” to calculate the indentation modulus of the adhesive layer.
  • the value is shown in Table 2 as the indentation modulus M2 (GPa) (the indentation modulus M2 is the second indentation modulus described above). Table 2 also shows the ratio (F1/M2) of the peel strength F1 to the indentation modulus M2.
  • the test temperature was 25° C.
  • the bending angle was 135 degrees
  • the bending speed was 175 times per minute
  • the bending number was 5000 times.
  • the laminated optical film of the present invention can be used, for example, as an element included in the laminated structure of a display panel such as a foldable display panel.

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JP2020529499A (ja) * 2017-08-03 2020-10-08 ヘンケル アイピー アンド ホールディング ゲゼルシャフト ミット ベシュレンクテル ハフツング 硬化性シリコーン光学的透明接着剤およびその使用

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