WO2021261120A1 - Corps multicouche optique, corps multicouche optique avec couche adhésive, et dispositif d'affichage d'image - Google Patents

Corps multicouche optique, corps multicouche optique avec couche adhésive, et dispositif d'affichage d'image Download PDF

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Publication number
WO2021261120A1
WO2021261120A1 PCT/JP2021/018806 JP2021018806W WO2021261120A1 WO 2021261120 A1 WO2021261120 A1 WO 2021261120A1 JP 2021018806 W JP2021018806 W JP 2021018806W WO 2021261120 A1 WO2021261120 A1 WO 2021261120A1
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WO
WIPO (PCT)
Prior art keywords
adhesive layer
optical
optical laminate
optical member
glass plate
Prior art date
Application number
PCT/JP2021/018806
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English (en)
Japanese (ja)
Inventor
岳仁 淵田
俊樹 大峰
恵太 家原
孝伸 矢野
Original Assignee
日東電工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from JP2020194694A external-priority patent/JP2022007904A/ja
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to CN202180045136.2A priority Critical patent/CN115916526A/zh
Priority to KR1020227045461A priority patent/KR20230027078A/ko
Publication of WO2021261120A1 publication Critical patent/WO2021261120A1/fr

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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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10018—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising only one glass sheet
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific 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
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10431—Specific parts for the modulation of light incorporated into the laminated safety glass or glazing
    • B32B17/1044—Invariable transmission
    • B32B17/10458—Polarization selective transmission
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10779—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing polyester
    • 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
    • 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
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/08—Dimensions, e.g. volume
    • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105—Thickness
    • 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
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/206—Organic displays, e.g. OLED
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light

Definitions

  • the present invention relates to an optical laminate provided with a glass plate, an optical laminate with an adhesive layer, and an image display device.
  • an optical laminate including a cover window material, an adhesive layer, and an optical member is provided in an image display device.
  • an optical laminate including a glass plate as a cover window material, an adhesive layer, and a polyethylene terephthalate (PET) film as an optical member has been proposed (see, for example, Patent Document 1 below).
  • the glass plate has excellent optical properties but low impact resistance. Impact resistance is a property of suppressing damage such as cracks in the glass plate when the glass plate is impacted.
  • the bending resistance of the optical laminate is improved by joining the glass plate and the polyethylene terephthalate film with an adhesive layer. Bending resistance is a property of suppressing damage such as cracks in the glass plate when the optical laminate is bent.
  • the present invention provides an optical laminate having excellent impact resistance and bending resistance, an optical laminate with an adhesive layer, and an image display device.
  • the inventors of the present application have found that the impact resistance and bending resistance of the optical laminate can be improved by hardening the optical member and further hardening the adhesive layer.
  • a glass plate, an adhesive layer, and an optical member are provided in order toward one side in the thickness direction, and the adhesive layer is provided on one side in the thickness direction of the glass plate and the thickness of the optical member.
  • the optical member is in contact with the other surface in the direction, the thickness of the optical member is 70 ⁇ m or less, the optical member does not contain an adhesive layer, and the rigidity of the optical member obtained according to the method A described in JIS L 1096 (2010).
  • the present invention (2) includes the optical laminate according to (1), wherein the thickness of the adhesive layer is 5 ⁇ m or less.
  • the present invention (3) includes the optical laminate according to (1) or (2), wherein the thickness of the glass plate is 100 ⁇ m or less.
  • the present invention (4) is an optical laminate provided with a glass plate, an adhesive layer, and an optical member in order toward one side in the thickness direction, and the adhesive layer is one surface in the thickness direction of the glass plate.
  • the optical member is in contact with the other surface in the thickness direction of the optical member, and the thickness of the optical member is 70 ⁇ m or less.
  • the pen drop test in which a 0.7 mm ballpoint pen is dropped, the glass plate is not cracked, the pencil hardness of the optical laminate is 5H or more, and the following flexibility test is 100,000 times or more. Includes laminate.
  • the present invention (5) includes the optical laminate according to any one of (1) to (4) and an adhesive layer arranged on one side of the optical member of the optical laminate in the thickness direction. Includes an optical laminate with an adhesive layer, wherein the optical member has a stiffness of 45 mm or more and the indentation elastic modulus of the adhesive layer at 25 ° C. measured by the nanoindenter method is less than 1 GPa. ..
  • the present invention (6) is the optical laminate with an adhesive layer according to (5), wherein the optical member has a rigidity of 50 mm or more.
  • the present invention (7) is bendable and is the optical laminate according to any one of (1) to (4), or the optical laminate with an adhesive layer according to (5) or (6). And an image display member, the image display member and the image display member are provided in order toward one side in the thickness direction.
  • the rigidity of the optical member is increased to make the optical member harder, and the indentation elasticity of the adhesive layer is also increased to increase the adhesive layer. Since it is made hard, the optical member can be made thin, and the bending resistance of the optical laminate can be improved, while the impact resistance can also be improved.
  • the image display device of the present invention includes an optical laminate having excellent impact resistance and bending resistance or an optical laminate with an adhesive layer, it is bendable but has excellent impact resistance.
  • FIG. 1 is a cross-sectional view of an embodiment of the optical laminate of the present invention.
  • FIG. 2 is a cross-sectional view of an organic electroluminescence display device including the optical laminate shown in FIG. 3A to 3B are perspective views illustrating the 45 ° cantilever method, FIG. 3A shows a state in which the sample is placed on the upper surface, and FIG. 3B shows a state in which the sample is extruded to one side in the horizontal direction.
  • FIG. 4 is a cross-sectional view of a modified example of the optical laminate.
  • FIG. 5 is a cross-sectional view of a modified example of the optical laminate with an adhesive layer.
  • FIG. 6 is a cross-sectional view of a modified example of the optical laminate with an adhesive layer.
  • the optical laminate 1 has, for example, a flat plate shape extending in a plane direction orthogonal to the thickness direction.
  • the optical laminate 1 is configured to be bendable around a bent portion 33 located between two sides 30 facing each other with a space between them in the plane direction, and more preferably, the optical laminate 1 is foldable.
  • the optical laminate 1 includes a glass plate 2, an adhesive layer 3, and an optical member 4 in order toward one side in the thickness direction.
  • the optical laminate 1 includes only a glass plate 2, an adhesive layer 3, and an optical member 4.
  • the glass plate 2 extends in the plane direction.
  • the glass plate 2 forms the other surface in the thickness direction of the optical laminate 1.
  • the thickness of the glass plate 2 is, for example, 15 ⁇ m or more, preferably 30 ⁇ m or more, and for example, 150 ⁇ m or less, preferably 100 ⁇ m or less, and more preferably 75 ⁇ m or less.
  • the thickness of the glass plate 2 is equal to or greater than the above-mentioned lower limit, the impact resistance of the optical laminate 1 can be ensured.
  • the thickness of the glass plate 2 is not more than the above-mentioned upper limit, the optical laminated body 1 can be thinned, and the bending resistance of the optical laminated body 1 is excellent.
  • the glass plate 2 is referred to as a thin glass plate.
  • the total light transmittance of the glass plate 2 is, for example, 80% or more, preferably 85% or more, and for example, 99% or less.
  • the glass plate 2 a commercially available product can be used, and for example, the G-leaf series (registered trademark, manufactured by Nippon Electric Glass Co., Ltd.) can be used.
  • the adhesive layer 3 extends in the plane direction.
  • the adhesive layer 3 is in contact with one side of the glass plate 2 in the thickness direction.
  • the adhesive layer 3 is not a pressure-sensitive adhesive layer (pressure-sensitive adhesive layer) made of a pressure-sensitive adhesive (pressure-sensitive adhesive), but a cured product of a curable adhesive.
  • the adhesive layer 3 is not a pressure-sensitive adhesive layer whose adhesive strength does not substantially change with time, but a cured product of a curable adhesive that undergoes a curing reaction by irradiation with active energy rays or heating.
  • the curable adhesive is a curing raw material for the adhesive layer 3, and examples thereof include an active energy curing type and a thermosetting type, and an active energy curing type is preferable.
  • examples of the curable adhesive include an acrylic adhesive composition, an epoxy adhesive composition, a silicone adhesive composition, and the like, and from the viewpoint of translucency, an acrylic adhesive composition can be mentioned. Be done.
  • the acrylic adhesive composition contains, for example, a monomer component containing a functional group-containing (meth) acrylic ester monomer containing a functional group and a copolymerizable monomer.
  • the functional group-containing (meth) acrylic ester monomer is a functional group-containing methacrylic ester monomer and / or a functional group-containing acrylic ester monomer.
  • the definition of (meta) is the same as follows.
  • the functional group include a hydroxyl group, an amino group, a heterocyclic group, a lactone ring group and the like.
  • the functional group-containing (meth) acrylic ester monomer contains a hydroxyl group such as 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate.
  • Amino group-containing (meth) acrylic ester monomers such as (meth) acrylic ester monomers, such as dimethylaminoethyl (meth) acrylates, dimethylaminopropyl (meth) acrylates, diethylaminoethyl (meth) acrylates, such as tetrahydrofurfuryl (meth).
  • Heterocyclic group-containing (meth) acrylic ester monomers such as acrylates, glycidyl (meth) acrylates, pentamethylpiperidinyl (meth) acrylates, tetramethylpiperidinyl (meth) acrylates, such as ⁇ -butyrolactone (meth) acrylates.
  • Examples thereof include a lactone ring group-containing (meth) acrylic ester monomer such as a monomer. Preferred are hydroxyl group-containing (meth) acrylic ester monomers.
  • the ratio of the functional group-containing (meth) acrylic ester monomer in the monomer component is, for example, 5% by mass or more, preferably 10% by mass or more, and for example, 60% by mass or less, preferably 40% by mass or less. be.
  • the copolymerizable monomer is a vinyl monomer copolymerizable with the functional group-containing (meth) acrylic ester monomer.
  • the copolymerizable monomer include cyano group-containing vinyl monomers such as (meth) acrylonitrile, for example, (meth) acrylamide, dimethyl (meth) acrylamide, dimethylaminopropyl (meth) acrylamide, isopropyl (meth) acrylamide, and diethyl (meth).
  • Examples thereof include amide group-containing vinyl monomers such as acrylamide and (meth) acryloylmorpholine. Preferred are amide group-containing vinyl monomers.
  • the amide group-containing vinyl monomer may have a hydroxyl group, and examples of such an amide group-containing vinyl monomer include N- (2-hydroxyethyl) (meth) acrylamide and N- (2-hydroxy).
  • Examples thereof include hydroxyalkyl (meth) acrylamides such as -hydroxybutyl) (meth) acrylamide and N- (4-hydroxybutyl) (meth) acrylamide.
  • N- (2-hydroxyethyl) (meth) acrylamide Preferred are N- (2-hydroxyethyl) (meth) acrylamide.
  • the proportion of the copolymerizable monomer in the monomer component is, for example, 40% by mass or more, preferably 60% by mass or more, and for example, 95% by mass or less, preferably 90% by mass or less.
  • the number of parts by mass of the copolymerizable monomer with respect to 100 parts by mass of the functional group-containing (meth) acrylic ester monomer is, for example, 50 parts by mass or more, preferably 200 parts by mass or more, and for example, 1,000 parts by mass or less. It is preferably 500 parts by mass or less.
  • the acrylic adhesive composition may contain a known polymerization initiator.
  • the number of parts by mass of the polymerization initiator with respect to 100 parts by mass of the monomer component is, for example, 0.3 parts by mass or more and 3 parts by mass or less.
  • acrylic adhesive composition and a cured product thereof (curable adhesive) are described in, for example, Japanese Patent Application Laid-Open No. 2013-077006.
  • the thickness of the adhesive layer 3 is, for example, 0.1 ⁇ m or more, and is, for example, 10 ⁇ m or less, preferably 5 ⁇ m or less, and more preferably 3 ⁇ m or less.
  • the thickness of the adhesive layer 3 is equal to or greater than the above-mentioned lower limit, the glass plate 2 and the optical member 4 can be reliably adhered to each other.
  • the thickness of the adhesive layer 3 is not more than the above-mentioned upper limit, the optical laminate 1 can be thinned, and the optical laminate 1 has excellent bending resistance.
  • the total light transmittance of the adhesive layer 3 is, for example, 80% or more, preferably 85% or more, and for example, 99% or less.
  • the indentation elastic modulus of the adhesive layer 3 at 25 ° C. measured by the nanoindenter method is 1 GPa or more, preferably 2 GPa or more, more preferably 3 GPa or more, still more preferably 4 GPa or more, and also. For example, it is 100 GPa or less. If the indentation elastic modulus of the adhesive layer 3 is less than 1 GPa, the impact resistance is lowered.
  • the method of determining the indentation elastic modulus of the adhesive layer 3 at 25 ° C. measured by the nanoindenter method will be described in detail in a later example.
  • the tensile storage elastic modulus E'of the adhesive layer 3 at 25 ° C. is, for example, 1 GPa or more, preferably 2 GPa or more, more preferably 3 GPa or more, still more preferably 4 GPa or more, and for example, 100 GPa or more. It is as follows. If the tensile storage elastic modulus E'of the adhesive layer 3 is less than 1 GPa, the impact resistance is lowered.
  • the tensile storage elastic modulus E'of the adhesive layer 3 at 25 ° C. is obtained by measuring the dynamic viscoelasticity in a temperature dispersion mode under the conditions of a frequency of 1 Hz and a heating rate of 5 ° C./min.
  • the optical member 4 forms one side of the optical laminate 1 in the thickness direction.
  • the optical member 4 is located on the opposite side of the glass plate 2 with respect to the adhesive layer 3.
  • the optical member 4 extends in the plane direction.
  • the optical member 4 is in contact with one surface of the adhesive layer 3 in the thickness direction.
  • the adhesive layer 3 is in contact with one surface of the glass plate 2 in the thickness direction and the other surface of the optical member 4 in the thickness direction, and the glass plate 2 and the optical member 4 are bonded (bonded) to each other.
  • the optical member 4 includes, for example, a polarizing element protective film 5, a polarizing element 6, and an optical compensation layer 7 in order toward one side in the thickness direction.
  • the optical member 4 is a laminated body as described above, and does not include an adhesive layer whose adhesive strength does not substantially change with time.
  • the polarizing element protective film 5 forms the other surface of the optical member 4 in the thickness direction.
  • the polarizing element protective film 5 extends in the plane direction.
  • the polarizing element protective film 5 protects the polarizing element 6 described below from the other side in the thickness direction.
  • the polarizing element protective film 5 has isotropic properties.
  • Examples of the material of the polarizing element protective film 5 include an acrylic resin.
  • the acrylic resin preferably includes a (meth) acrylic resin having a lactone ring structure from the viewpoint of obtaining high mechanical strength.
  • Examples of the (meth) acrylic resin having a lactone ring structure include JP-A-2000-230016, JP-A-2001-151814, JP-A-2002-120326, JP-A-2002-254544, and JP-A-2005. It is described in JP-A-146804, JP-A-2008-170717, and JP-A-2017-102443.
  • the thickness of the polarizing element protective film 5 is, for example, 10 ⁇ m or more, and is, for example, 60 ⁇ m or less, preferably 55 ⁇ m or less, and more preferably 50 ⁇ m or less.
  • the polarizing element 6 is in contact with one side of the polarizing element protective film 5 in the thickness direction.
  • the extruder 6 extends in the plane direction.
  • the splitter 6 include a film obtained by dyeing and stretching a hydrophilic film such as a PVA film, a film obtained by dehydrating a hydrophilic film, and a film obtained by dehydroxating a polyvinyl chloride film.
  • the thickness of the polarizing element 6 is, for example, 1 ⁇ m or more, preferably 3 ⁇ m or more, and for example, 15 ⁇ m or less, preferably 10 ⁇ m or less.
  • the physical characteristics of the decoder 6 and the like are described in, for example, JP-A-2016-151696 and JP-A-2017-102443.
  • the optical compensation layer 7 is in contact with one surface of the polarizing element 6 in the thickness direction.
  • the optical compensation layer 7 extends in the plane direction.
  • the optical compensation layer 7 is, for example, a retardation film, and specifically functions as a ⁇ / 4 plate.
  • the polarizing film 8 composed of the polarizing element 6 and the optical compensation layer 7 has circular dichroism.
  • the material of the optical compensation layer 7 include materials having the above-mentioned optical properties, and examples thereof include polycarbonate resin, polyvinyl acetal resin, cycloolefin resin, acrylic resin, and cellulose ester resin. A polycarbonate resin is preferable.
  • polycarbonate resin examples include a structural unit derived from a fluorene-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, an alicyclic diol, an alicyclic dimethanol, di, tri or polyethylene glycol, and an alkylene. Includes structural units derived from at least one dihydroxy compound selected from the group consisting of glycols or spiroglycols.
  • the composition, physical properties, manufacturing method, and the like of the optical compensation layer 7 are described in detail in, for example, Japanese Patent Application Laid-Open No. 2017-102443.
  • the optical compensation layer 7 may be a laminated body, and although not shown, for example, a first liquid crystal alignment layer and a second liquid crystal alignment layer are provided in order toward the back side.
  • the first liquid crystal oriented solidified layer functions as a ⁇ / 2 plate.
  • the in-plane phase difference Re (550) of the first liquid crystal oriented solidified layer when measured with light having a wavelength of 550 nm is, for example, 180 nm to 320 nm.
  • nx is the refractive index in the slow axis direction in the in-plane direction.
  • ny is the refractive index in the phase-advancing axis direction in the in-plane direction.
  • nz is the refractive index in the thickness direction.
  • the angle formed by the slow axis of the first liquid crystal oriented solidified layer and the absorption axis of the polarizing element 6 is, for example, 10 ° to 20 °.
  • the thickness of the first liquid crystal oriented solidifying layer is, for example, 0.05 ⁇ m or more, and for example, 7 ⁇ m or less.
  • the first liquid crystal alignment solidified layer is oriented with rod-shaped liquid crystal materials arranged in a predetermined direction, for example. A slow-phase axis appears in the orientation direction of the liquid crystal material. Examples of the liquid crystal material include a liquid crystal polymer and a liquid crystal monomer.
  • the surface of a predetermined base material is subjected to an orientation treatment, and a coating liquid containing a liquid crystal material is applied to the surface to make the liquid crystal material in a direction corresponding to the orientation treatment. Orientation is performed and the alignment state is fixed.
  • the second liquid crystal oriented solidified layer functions as, for example, a ⁇ / 4 plate.
  • the optical compensation layer 7 has excellent circularly polarized light characteristics because the first liquid crystal oriented solidified layer functions as a ⁇ / 2 plate and the second liquid crystal oriented solidified layer functions as a ⁇ / 4 plate.
  • the in-plane phase difference Re (550) of the second liquid crystal oriented solidified layer when measured with light having a wavelength of 550 nm is, for example, 100 nm to 180 nm.
  • the angle formed by the slow axis of the second liquid crystal oriented solidified layer and the absorption axis of the polarizing element 6 is, for example, 65 ° to 85 °.
  • the thickness of the second liquid crystal oriented solidified layer is, for example, 0.5 ⁇ m or more and 2 ⁇ m or less.
  • the materials, properties, manufacturing methods, etc. of the second liquid crystal oriented solidified layer are the same as those of the first liquid crystal oriented solidified layer.
  • the laminate composed of the first and second liquid crystal oriented solidified layers described above is described in, for example, Japanese Patent Application Laid-Open No. 2017-102443.
  • the thickness of the optical compensation layer 7 is, for example, 0.1 ⁇ m or more, for example, 10 ⁇ m or less, preferably 5 ⁇ m or less, and more preferably 3 ⁇ m or less.
  • optical member 4 having the polarizing element protective film 5, the polarizing element 6, and the optical compensation layer 7 is described in detail in Japanese Patent Application Laid-Open No. 2017-102443.
  • the thickness of the optical member 4 is 70 ⁇ m or less, preferably 65 ⁇ m or less.
  • the thickness of the optical member 4 is, for example, 10 ⁇ m or more, preferably 30 ⁇ m or more. If the thickness of the optical member 4 exceeds 70 ⁇ m, the optical laminated body 1 cannot be thinned, and the bending resistance of the optical laminated body 1 is lowered. If the thickness of the optical member 4 is at least the above-mentioned lower limit, the impact resistance can be improved.
  • the total light transmittance of the optical member 4 is, for example, 80% or more, preferably 85% or more, and for example, 99% or less.
  • the rigidity of the optical member 4 obtained according to the method A described in JIS L 1096 (2010) is 30 mm or more.
  • the method A described in JIS L 1096 (2010) is a 45 ° cantilever method.
  • a testing machine 20 having a lower surface 21, an upper surface 22, and a slope 23 is used.
  • the lower surface 21 and the upper surface 22 are horizontal and are spaced apart in the vertical direction.
  • the slope 23 connects one side of the lower surface 21 and one side of the upper surface 22.
  • the angle formed by the slope 23 and the lower surface 21 is 45 °.
  • the upper surface 22 and the slope 23 form a ridge line 24.
  • the optical member 4 is externally processed to a size of 150 mm in length and 20 mm in width to prepare a sample 25.
  • the sample 25 is placed on the upper surface 22.
  • the side surface 26 of one of the samples 25 is aligned with the ridge line 24 of the testing machine 20.
  • the first position 31, which is the position of the other side 27 of the sample 25, is recorded. This test is carried out at a temperature of 25 ° C.
  • the sample 25 is gradually pushed out to one side in the horizontal direction in which one side 26 faces the slope 23.
  • the extrusion speed is 5 mm / sec.
  • the second position 32 which is the position of the other side side 27 when one side side 26 comes into contact with the slope 23, is recorded.
  • the tip portion including one side side 26 is curved downward.
  • the distance L between the first position 31 and the second position 32 is measured, and this is obtained as the rigidity.
  • the rigidity of the optical member 4 is less than 30 mm, the optical member 4 is soft, so that the impact resistance of the optical laminate 1 is lowered.
  • the rigidity of the optical member 4 is preferably 35 mm or more, more preferably 40 mm or more, still more preferably 45 mm or more, and for example, 100 mm or less.
  • one side of the glass plate 2 in the thickness direction and / or the other side of the optical member 4 in the thickness direction is brought into contact with the curable adhesive. Subsequently, the curable adhesive is sandwiched between the glass plate 2 and the optical member 4.
  • the curable adhesive is cured.
  • the curable adhesive is an active energy curable type
  • the curable adhesive is irradiated with active energy such as ultraviolet rays.
  • the curable adhesive is irradiated with ultraviolet rays from the glass plate 2 side.
  • the curable adhesive is thermosetting, heat the curable adhesive. As a result, the adhesive layer 3 that firmly adheres the glass plate 2 and the optical member 4 is formed.
  • the optical laminate 1 is used for various optical applications, and is provided in, for example, an image display device such as an organic electroluminescence display device (hereinafter, simply abbreviated as "organic EL display device").
  • an image display device such as an organic electroluminescence display device (hereinafter, simply abbreviated as "organic EL display device”).
  • the organic EL display device 10 has a flat plate shape extending in the plane direction.
  • the organic EL display device 10 is configured to be bendable around the bent portion 33, and more specifically, is configured to be foldable. Further, since the organic EL display device 10 includes the conductive film 13 described below, it functions as a touch panel type input display device.
  • the organic EL display device 10 includes an optical laminate 1, a pressure-sensitive adhesive layer 12, a conductive film 13, a second pressure-sensitive adhesive layer 14, and an image display member 15.
  • the upper side of the paper surface is the user's visual recognition side, which is the front side (corresponding to the other side in the thickness direction of FIG. 1), and the lower side of the paper surface is the back side (one side in the thickness direction of FIG. 1). Equivalent to).
  • the pressure-sensitive adhesive layer 12 is arranged on the back surface (corresponding to one surface in the thickness direction) of the optical member 4. Specifically, the pressure-sensitive adhesive layer 12 is in contact with the back surface of the optical member 4.
  • the adhesive strength of the pressure-sensitive adhesive layer 12 does not substantially change over time and is stable.
  • the material of the pressure-sensitive adhesive layer 12 include an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a vinyl alkyl ether-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, a polyamide-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, and a fluorine-based pressure-sensitive adhesive.
  • Examples thereof include a pressure-sensitive adhesive, an epoxy-based pressure-sensitive adhesive, a polyether-based pressure-sensitive adhesive, and the like, preferably an acrylic-based pressure-sensitive adhesive.
  • a pressure-sensitive adhesive an epoxy-based pressure-sensitive adhesive, a polyether-based pressure-sensitive adhesive, and the like, preferably an acrylic-based pressure-sensitive adhesive.
  • the physical properties, dimensions, and the like of the pressure-sensitive adhesive layer 12 are described in detail in, for example, Japanese Patent Application Laid-Open No. 2018-28873.
  • the pressure-sensitive adhesive layer 12 is provided in the optical laminate 9 with a pressure-sensitive adhesive layer together with the optical member 4. Details of the optical laminate 9 with an adhesive layer will be described later.
  • the conductive film 13 includes a conductive layer 16 and a base material layer 17 in order toward the back side.
  • the conductive layer 16 has a predetermined pattern. The surface and sides of the conductive layer 16 come into contact with the pressure-sensitive adhesive layer 12.
  • Examples of the material of the conductive layer 16 include metal oxides, conductive fibers (fibers), and metals.
  • the metal oxide include indium zinc composite oxide (IZO), indium gallium zinc composite oxide (IGZO), indium gallium composite oxide (IGO), indium tin composite oxide (ITO), and antimonth tin composite oxide. Examples thereof include composite oxides such as (ATO).
  • Examples of conductive fibers include metal nanowires and carbon nanotubes. Examples of the metal include gold, platinum, silver, copper and the like.
  • the conductive layer 16 integrally has a sensor electrode portion 18 located in the central portion in the plane direction and a drawer wiring portion 19 located in the periphery of the sensor electrode portion 18. Details of the conductive layer 16 are described in, for example, JP-A-2017-102443, JP-A-2014-113705, JP-A-2014-219667 and the like.
  • the base material layer 17 is arranged on the back surface of the conductive layer 16 and the back surface of the pressure-sensitive adhesive layer 12.
  • the base material layer 17 extends in the plane direction.
  • the base material layer 17 is, for example, a resin layer.
  • the material of the base material layer 17 includes, for example, an olefin resin such as polyethylene, polypropylene, and a cycloolefin polymer (COP), for example, a polyester resin such as polyethylene terephthalate (PET), polybutylene terephthalate, and polyethylene naphthalate, for example, poly (.
  • Examples of the (meth) acrylic resin such as meta) acrylate include resins such as polycarbonate resin, polyether sulfone resin, polyarylate resin, melamine resin, polyamide resin, polyimide resin, cellulose resin and polystyrene resin. Details of the base material layer 17 are described in, for example, Japanese Patent Application Laid-Open No. 2018-181722.
  • the second pressure-sensitive adhesive layer 14 is arranged on the back surface of the conductive film 13. Specifically, the second pressure-sensitive adhesive layer 14 is in contact with the back surface of the conductive film 13. The material of the second pressure-sensitive adhesive layer 14 is the same as the material of the pressure-sensitive adhesive layer 12.
  • the image display member 15 forms the back surface of the organic EL display device 10.
  • the image display member 15 is arranged on the back side of the conductive film 13 via the second pressure-sensitive adhesive layer 14.
  • the image display member 15 extends in the plane direction.
  • the image display member 15 is an organic EL element.
  • the image display member 15 includes a display substrate, two electrodes, an organic EL layer sandwiched between the two electrodes, and a sealing layer.
  • the configuration, physical properties, and the like of the image display member 15 are described in detail in, for example, Japanese Patent Application Laid-Open No. 2018-28873.
  • the rigidity of the optical member 4 is set to 30 mm or more to make the optical member 4 hard, and the indentation elastic modulus of the adhesive layer 3 is increased to 1 GPa or more to increase the adhesive layer 3 to the adhesive layer 3. Therefore, the optical member 4 can be made thin, and the flexibility of the optical laminate 1 can be improved, while the impact resistance can also be improved.
  • the optical laminated body 1 if the thickness of the adhesive layer 3 is 5 ⁇ m or less, the optical laminated body 1 can be made thin, and the optical laminated body 1 is excellent in bending resistance.
  • the optical laminated body 1 if the thickness of the glass plate 2 is 100 ⁇ m or less, the optical laminated body 1 can be made thin, and the bending resistance of the optical laminated body 1 is excellent.
  • the organic EL display device 10 includes an optical laminate 1 having excellent impact resistance and bending resistance, it is bendable but has excellent impact resistance.
  • the optical laminate 1 of the above-described embodiment satisfies each of the rigidity of the adhesive layer 3 and the indentation elastic modulus of the adhesive layer 3, but for example, instead of the above-mentioned physical properties, the optical laminate 1 is an optical laminate. It is also possible to solve the problem of the present invention by satisfying each of the pen drop test, the pencil hardness, and the flexibility test.
  • ⁇ Pen drop test> As shown in FIG. 1, the optical laminate 1 is placed on the surface of the stainless steel horizontal table 34 so that the glass plate 2 faces upward. Next, a pen drop test is performed in which a 7 g pen 29 is dropped from a height of 5 cm from the glass plate 2. The above-mentioned height is the distance between one side of the glass plate 2 in the thickness direction and the tip portion 35 of the pen 29. The tip 35 faces downward and is pointed.
  • the pen 29 is a ballpoint pen manufactured by Pentel, has a model number "BK407 black", and has a ball diameter of 0.7 mm.
  • the height of the pen drop test becomes 5 cm. If the glass plate 2 does not crack, raise the height by 1 cm. This operation is repeated until the glass plate 2 is broken.
  • the glass plate 2 was not cracked in the pen drop test with a height of 5 cm.
  • a pen drop test in which a 7 g pen 29 is dropped from a height of 5 cm from the glass plate 2, if the glass plate 2 is cracked, the impact resistance of the optical laminate 1 is lowered.
  • the glass plate 2 is not cracked, and more preferably, a 7 g pen 29 is dropped from a height of 15 cm from the glass plate 2. In the pen drop test of dropping, the glass plate 2 is not cracked.
  • ⁇ Pencil hardness> The pencil hardness of the optical laminate 1 is 5H or more. On the other hand, when the pencil hardness of the optical laminate 1 is 4H or less, the scratch resistance of the optical laminate 1 is lowered. Pencil hardness is measured according to JIS K 5600-5-4 (1999).
  • the pencil hardness of the optical laminate 1 is preferably 6H or more, more preferably 7H or more, still more preferably 8H or more, and particularly preferably 9H or more.
  • the glass plate 2 is bent 180 ° so that the bending radius is 3 mm in the concave direction, and then stretched again as one set, and 43 sets per minute.
  • the operation is performed at a high speed, the number of sets until a crack is generated in the optical laminate 1 is measured.
  • the bending test of the optical laminate 1 is less than 100,000 times, the bending resistance is lowered.
  • the flexibility test of the optical laminate 1 is preferably 1,000 or more times.
  • the optical laminate 1 of another modification satisfies each of the rigidity of the adhesive layer 3 and the indentation elastic modulus of the adhesive layer 3, and in addition, the pen drop test, the pencil hardness, and the like. Satisfy each with the flexibility test. As a result, the optical laminate 1 is further excellent in impact resistance and bending resistance.
  • the optical member 4 includes three layers of a polarizing element protective film 5, a polarizing element 6, and an optical compensation layer 7, but the number of layers of the optical member 4 is not limited. It may be a single layer (see FIG. 4), two layers, four layers or more.
  • the optical member 4 has two layers, for example, a polarizing element 6 and an optical compensation layer 7 are provided, although not shown.
  • the optical member 4 can further include a second adhesive layer interposed between the polarizing element protective film 5 and the polarizing element 6. Further, the optical member 4 can further include a third adhesive layer interposed between the polarizing element 6 and the optical compensation layer 7.
  • the materials of the second adhesive layer and the third adhesive layer are, for example, the same as the materials of the adhesive layer 3 described above.
  • the thickness of each of the second adhesive layer and the third adhesive layer is, for example, 0.1 ⁇ m or more, and for example, 2 ⁇ m or less.
  • FIG. 4 shows a modified example in which the optical member 4 is a single layer.
  • the optical member 4 is a film 40.
  • the film 40 include a polyester film and a cell roll film.
  • the polyester film include polyethylene terephthalate film (PET), polybutylene terephthalate (PBT) film, and polyethylene naphthalate (PEN) film.
  • the cell roll film include acetyl cell roll fill, and specific examples thereof include a triacetyl cell roll (TAC) film.
  • TAC triacetyl cell roll
  • As the film 40 a polyester film is mentioned, and more preferably, a PET film is mentioned from the viewpoint of improving the impact resistance of the optical laminate 1.
  • the thickness of the film 40 is the same as the thickness of the optical member 4 described above.
  • the pressure-sensitive adhesive layer 12 can be attached to the optical layered body 1 to manufacture the optical laminated body 9 with the pressure-sensitive adhesive layer.
  • the optical laminate 9 with an adhesive layer includes an optical laminate 1 and an adhesive layer 12 arranged on one side of the optical laminate 1 in the thickness direction.
  • the pressure-sensitive adhesive layer 12 forms one side in the thickness direction of the optical laminate 9 with the pressure-sensitive adhesive layer.
  • the pressure-sensitive adhesive layer 12 is arranged on one side of the optical member 4 in the thickness direction. Specifically, the pressure-sensitive adhesive layer 12 is in contact with one side of the optical member 4 in the thickness direction.
  • the optical laminate 9 with an adhesive layer includes a glass plate 2, an adhesive layer 3, an optical member 4, and an adhesive layer 12 in order toward one side in the thickness direction.
  • the pressure-sensitive adhesive layer 12 is a pressure-sensitive adhesive body that adheres pressure-sensitively without a curing reaction.
  • the material of the pressure-sensitive adhesive layer 12 is the same as that of the pressure-sensitive adhesive layer 12 exemplified in the optical laminate 1.
  • the indentation elastic modulus of the pressure-sensitive adhesive layer 12 at 25 ° C. measured by the nanoindenter method is less than 1 GPa, preferably 0.2 GPa or less, and is, for example, 0.01 MPa or more. If the indentation elastic modulus of the pressure-sensitive adhesive layer 12 is equal to or higher than the above-mentioned upper limit, the pressure-sensitive adhesive layer 12 cannot adhere to the conductive film 13.
  • the thickness of the pressure-sensitive adhesive layer 12 is, for example, 5 ⁇ m or more, preferably 10 ⁇ m or more, and for example, 50 ⁇ m or less, preferably 25 ⁇ m or less.
  • the thickness of the optical laminate 9 with the pressure-sensitive adhesive layer is, for example, 30 ⁇ m or more, and is, for example, 250 ⁇ m or less.
  • the optical laminate 9 with an adhesive layer is provided in the organic EL display device 10.
  • the optical laminate 1 is attached to the conductive film 13 via the pressure-sensitive adhesive layer 12.
  • the rigidity of the optical member 4 is 45 mm or more. If the rigidity of the optical member 4 is less than 45 mm, the impact resistance of the optical laminate 9 with the adhesive layer is lowered.
  • the rigidity of the optical member 4 is preferably 50 mm or more, more preferably 55 mm or more. When the rigidity and softness of the optical member 4 is equal to or higher than the above-mentioned lower limit, the impact resistance of the optical laminate 9 with the pressure-sensitive adhesive layer can be improved.
  • the optical laminate 9 with an adhesive layer includes the above-mentioned optical laminate 1, and the rigidity of the optical member 4 is set to 45 mm or more to make the optical member 4 hard, so that the impact resistance can also be improved. can. Further, since the optical laminate 9 with the pressure-sensitive adhesive layer includes the pressure-sensitive adhesive layer 12, it can be easily attached to the conductive film 13, and the organic EL display device 10 can be easily manufactured.
  • the optical laminate 1 of one embodiment has an optical member 4 having a rigidity of 30 mm or more and is excellent in impact resistance.
  • the optical laminate 1 is advantageous over the optical laminate 9 with an adhesive layer in that the optical member 4 having a lower rigidity and softness can be mastered.
  • the rigidity of the optical member 4 is 50 mm or more, the impact resistance of the optical laminate 9 with the adhesive layer can be further improved.
  • FIG. 6 shows an optical laminate 9 with an adhesive layer including an optical member 4 made of a film 40 and an adhesive layer 12.
  • the optical laminate 9 with an adhesive layer includes a glass plate 2, an adhesive layer 3, an optical member 4 made of a film 40, and an adhesive layer 12 in order toward one side in the thickness direction.
  • the optical laminate 1 may further include a functional layer 37 arranged on the other side (back surface) of the glass plate 2 in the thickness direction.
  • the functional layer 37 include a hard coat layer, a shatterproof layer, an antifouling layer, and an antireflection layer. These may be a single layer or a plurality of laminated layers.
  • Example 1 A glass plate 2 (G-leaf) having a thickness of 50 ⁇ m was prepared. Further, 20 parts by mass of 4-hydroxybutyl acrylate, 80 parts by mass of N- (2-hydroxyethyl) acrylamide, and 0.5 parts by mass of a photopolymerization initiator (Irgacure 819, manufactured by BASF) are blended and bonded to acrylic. An agent composition was prepared. The acrylic adhesive composition was applied to the glass plate 2, and then the acrylic adhesive composition was sandwiched between the glass plate 2 and the optical member 4.
  • a photopolymerization initiator Irgacure 819, manufactured by BASF
  • the optical member 4 includes a polarizing element protective film 5, a polarizing element 6, and an optical compensation layer 7. Further, the optical member 4 has a second adhesive layer interposed between the polarizing element protective film 5 and the polarizing element 6, and a third adhesive layer interposed between the polarizing element 6 and the optical compensation layer 7. Further prepare.
  • the polarizing element protective film 5 is a (meth) acrylic resin film having a lactone ring structure described in Example 1 of JP-A-2008-170717.
  • the polarizing element 6 is the stretched PVA film described in Example 1 of JP-A-2017-102443.
  • the optical compensation layer 7 is the ⁇ / 4 plate and the ⁇ / 2 plate described in Example 4 of JP-A-2017-102443.
  • the thickness of the polarizing element protective film 5 is 40 ⁇ m
  • the thickness of the second adhesive layer is 1 ⁇ m
  • the thickness of the polarizing element 6 is 5 ⁇ m
  • the thickness of the third adhesive layer is 1 ⁇ m
  • the thickness of the optical compensation layer 7 is 4 ⁇ m.
  • the thickness of the optical laminate 1 was 51 ⁇ m.
  • the curable adhesive was irradiated with ultraviolet rays from the glass plate 2 side.
  • an adhesive layer 3 made of a cured body that firmly adheres the glass plate 2 and the optical member 4 was formed.
  • an optical laminate 1 having a glass plate 2, an adhesive layer 3, and an optical member 4 in order toward one side in the thickness direction was produced.
  • Comparative Example 1 An optical laminate 1 was produced in the same manner as in Example 1 except that the adhesive layer was placed on the optical laminate 1 instead of the adhesive layer 3 and was not irradiated with ultraviolet rays.
  • the pressure-sensitive adhesive layer was prepared as follows.
  • a monomer composition was prepared by blending 0.015 parts by mass of "Irgacure 184" manufactured by BASF as an initiator. The monomer composition was irradiated with ultraviolet rays to polymerize the monomers to obtain a prepolymer composition (polymerization rate; about 10%).
  • the above-mentioned photocurable pressure-sensitive adhesive composition was applied to the surface of the optical member 4 so as to have a thickness of 25 ⁇ m to form a coating layer.
  • the glass plate 2 was attached to this coating layer.
  • This photo-curable pressure-sensitive adhesive composition is photo-cured by irradiating it with ultraviolet rays from the glass plate 2 side with a black light whose position is adjusted so that the irradiation intensity on the irradiation surface directly under the lamp is 5 mW / cm 2.
  • a 25 ⁇ m pressure-sensitive adhesive layer was formed.
  • an optical laminate 1 having a glass plate 2, an adhesive layer, and an optical member 4 in order toward one side in the thickness direction was produced.
  • Comparative Example 2 An optical laminate 1 was produced in the same manner as in Example 1 except that the polarizing element protective film 5 was changed to a cycloolefin polymer film (ZT-12 manufactured by Nippon Zeon Corporation, thickness 13 ⁇ m).
  • Example 2 A pressure-sensitive adhesive layer 12 having a thickness of 15 ⁇ m was placed on one surface of the optical laminate 1 of Example 1 in the thickness direction by transfer. As a result, an optical laminate 9 with an adhesive layer including the optical laminate 1 and the adhesive layer 12 was manufactured.
  • the pressure-sensitive adhesive layer 12 was prepared as follows.
  • LA lauryl acrylate
  • EHA 2-ethylhexyl acrylate
  • HBA 4-hydroxybutyl acrylate
  • NDP N-vinyl-2-pyrrolidone
  • BASF BASF
  • DCPMA dicyclopentanyl methacrylate
  • MMA methyl methacrylate
  • ⁇ -thioglycerol 100 parts by mass of toluene
  • reaction solution was heated to 130 ° C., and toluene, the chain transfer agent and the unreacted monomer were dried and removed to obtain a solid acrylic oligomer.
  • the weight average molecular weight of the acrylic oligomer was 5100.
  • the glass transition temperature (Tg) was 130 ° C.
  • the pressure-sensitive adhesive composition is applied to the surface of a release sheet made of PET film (Mitsubishi Chemical "Diafoil MRF75”), and then a release sheet made of another PET film (Mitsubishi Chemical "Diafoil MRF75”) is applied. It was attached to the film. Then, the coating film was irradiated with ultraviolet rays to prepare an adhesive layer 12 having a thickness of 15 ⁇ m.
  • the pressure-sensitive adhesive layer 12 at 25 ° C. measured by the nanoindenter method was 0.00011 GPa.
  • Comparative Example 3 The pressure-sensitive adhesive layer 12 of Example 2 was placed on one side of the optical laminate 1 of Comparative Example 1 in the thickness direction by transfer to produce an optical laminate 9 with a pressure-sensitive adhesive layer.
  • Comparative Example 4 The pressure-sensitive adhesive layer 12 of Example 2 was placed on one side of the optical laminate 1 of Comparative Example 2 in the thickness direction by transfer to produce an optical laminate 9 with a pressure-sensitive adhesive layer.
  • Example 3 An optical laminate 9 with an adhesive layer was manufactured in the same manner as in Example 2. However, as the optical member 4, a film 40 (Diafoil S100, manufactured by Mitsubishi Chemical Corporation) made of a polyethylene terephthalate film having a thickness of 50 ⁇ m was used.
  • a film 40 (Diafoil S100, manufactured by Mitsubishi Chemical Corporation) made of a polyethylene terephthalate film having a thickness of 50 ⁇ m was used.
  • Example 4 An optical laminate 9 with an adhesive layer was manufactured in the same manner as in Example 2. However, as the optical member 4, a triacetyl cellulose film (KC4UYW, manufactured by Konica Minolta) having a thickness of 40 ⁇ m was used.
  • a triacetyl cellulose film (KC4UYW, manufactured by Konica Minolta) having a thickness of 40 ⁇ m was used.
  • Comparative Example 5 An optical laminate 9 with an adhesive layer was manufactured in the same manner as in Example 2. However, as the film 40, an acrylic film obtained by forming a methacrylic resin pellet having a glutarimide ring unit into a film by extrusion molding and then stretching the film was used. The thickness of the acrylic film was 40 ⁇ m.
  • the indentation elastic modulus of the adhesive layer 3 at 25 ° C. in Examples 1 to 4, Comparative Example 2, Comparative Example 4 and Comparative Example 5 was measured based on the nanoindenter method.
  • the measurement target is the adhesive layer 3 arranged between the glass plate 2 and the optical member 4.
  • the measurement conditions of the nanoindenter method are as follows. As a result, the indentation elastic modulus of the adhesive layer 3 at 25 ° C. was 5 GPa.
  • the indentation elastic modulus of the pressure-sensitive adhesive layer in Comparative Example 1 and Comparative Example 3 was measured based on the nanoindenter method.
  • the measurement target is an adhesive layer arranged between the glass plate 2 and the optical member 4.
  • the measurement conditions of the nanoindenter method are the same as above.
  • the indentation depth was set to 1500 nm.
  • the indentation elastic modulus of the pressure-sensitive adhesive layer at 25 ° C. was 0.00011 GPa (0.11 MPa).
  • the acrylic adhesive composition used in Examples 1 to 4, Comparative Example 2, Comparative Example 4 and Comparative Example 5 was applied to the surface of the release film, and then irradiated with ultraviolet rays to prepare a film (cured body). did.
  • the film was peeled from the release film.
  • the tensile storage elastic modulus E'of the film was determined by measuring the dynamic viscoelasticity of the film in a temperature dispersion mode under the conditions of a frequency of 1 Hz and a heating rate of 5 ° C./min. As a result, the tensile storage elastic modulus E'of the adhesive layer 3 at 25 ° C. was 3.4 GPa.
  • the acrylic adhesive used in Comparative Example 1 and Comparative Example 3 was externally processed into a disk shape, sandwiched between parallel plates, and dynamically viscoelastic under the following conditions using "Advanced Rheometric Expansion System (ARES)” manufactured by Rheometric Scientific.
  • the shear storage elastic modulus G'at 25 ° C. of the pressure-sensitive adhesive layer was determined by the elastic measurement.
  • the shear storage elastic modulus G'of the pressure-sensitive adhesive layer at 25 ° C. was 0.00003 GPa (0.03 MPa).
  • the optical laminate is provided in the image display device.

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Abstract

Ce corps multicouche optique (1) est doté d'une plaque de verre (2), d'une couche adhésive (3) et d'un élément optique (4) séquentiellement en direction d'un côté dans la direction de l'épaisseur. La couche adhésive (3) est en contact avec une surface de la plaque de verre (2), ladite surface étant sur un côté dans la direction de l'épaisseur, et une surface de l'élément optique (4), ladite surface étant sur l'autre côté dans la direction de l'épaisseur. L'élément optique (4) présente une épaisseur de 70 μm ou moins. L'élément optique (4) ne contient pas de couche adhésive. La résistance à la flexion de l'élément optique (4) telle qu'obtenue conformément au procédé A qui est exposé dans JIS L 1096 (2010) est de 30 mm ou plus. Le module d'élasticité d'indentation de la couche adhésive (3) à 25 °C tel que déterminé par un procédé de nano-indentation est de 1 GPa ou plus.
PCT/JP2021/018806 2020-06-24 2021-05-18 Corps multicouche optique, corps multicouche optique avec couche adhésive, et dispositif d'affichage d'image WO2021261120A1 (fr)

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CN202180045136.2A CN115916526A (zh) 2020-06-24 2021-05-18 光学层叠体、带粘合剂层的光学层叠体以及图像显示装置
KR1020227045461A KR20230027078A (ko) 2020-06-24 2021-05-18 광학 적층체, 점착제층 부착 광학 적층체 및 화상 표시 장치

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