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WO2021261118A1 - Stratifié optique et stratifié optique fixé par une couche adhésive - Google Patents

Stratifié optique et stratifié optique fixé par une couche adhésive Download PDF

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Publication number
WO2021261118A1
WO2021261118A1 PCT/JP2021/018804 JP2021018804W WO2021261118A1 WO 2021261118 A1 WO2021261118 A1 WO 2021261118A1 JP 2021018804 W JP2021018804 W JP 2021018804W WO 2021261118 A1 WO2021261118 A1 WO 2021261118A1
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WO
WIPO (PCT)
Prior art keywords
film
adhesive layer
optical laminate
thickness
glass plate
Prior art date
Application number
PCT/JP2021/018804
Other languages
English (en)
Japanese (ja)
Inventor
孝伸 矢野
貴巳 疋田
岳仁 淵田
洪賛 趙
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.)
Filing date
Publication date
Priority claimed from JP2020194695A external-priority patent/JP7311479B2/ja
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to CN202180045135.8A priority Critical patent/CN115943035A/zh
Priority to KR1020227043306A priority patent/KR20230026317A/ko
Publication of WO2021261118A1 publication Critical patent/WO2021261118A1/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
    • 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
    • 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
    • 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
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/51—Elastic
    • 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
    • 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

Definitions

  • the present invention relates to an optical laminate provided with a glass plate and an optical laminate with an adhesive layer.
  • An optical laminate including a glass plate, an adhesive layer, and a polyethylene terephthalate film or a triacetyl cellulose film is known (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 including cracks in the glass plate when the glass plate is impacted.
  • the thickness of the glass plate is 50 ⁇ m.
  • the inventors of the present application surprisingly provided a thin glass plate having a thickness of less than 40 ⁇ m in the optical laminate, and also provided a film having a specific tan ⁇ and a specific tensile storage elastic modulus E'. It has been found that the impact resistance of the optical laminate and the optical laminate with the adhesive layer can be improved by providing the optical laminate with the adhesive layer.
  • a glass plate, an adhesive layer, and a film are provided in order toward one side in the thickness direction, and the glass plate has a thickness of less than 40 ⁇ m, a frequency of 10 Hz, and a temperature rise rate of 2 ° C.
  • the average tan ⁇ of the film from -100 ° C to -50 ° C determined by the dynamic viscoelasticity test in the tensile mode at / min is 0.04 or more, and from -100 ° C determined by the dynamic viscoelasticity test. It contains an optical laminate having an average tensile storage elastic modulus E'of the film at ⁇ 50 ° C. of 3 GPa or more and 6 GPa or less.
  • the present invention (2) includes the optical laminate according to (1), wherein the average of the tan ⁇ of the film is 0.06 or more.
  • the present invention (3) includes the optical laminate according to (1) or (2), wherein the film has a thickness of 80 ⁇ m or less.
  • the present invention (4) includes the optical laminate according to any one of (1) to (3), wherein the film is a polyethylene terephthalate film.
  • 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 film in the thickness direction of the optical laminate.
  • An optical laminate with a pressure-sensitive adhesive layer having a thickness of the pressure-sensitive adhesive layer of 20 ⁇ m or less is included.
  • the adhesive layer is a film having a specific tan ⁇ and a specific tensile storage elastic modulus E', even though the thickness of the glass plate is as thin as less than 40 ⁇ m. Since it is prepared through, it 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.
  • the optical laminate 1 has, for example, a flat plate shape extending in the plane direction.
  • the plane direction is orthogonal to the thickness direction of the optical laminate 1.
  • the optical laminate 1 includes a glass plate 2, an adhesive layer 3, and a film 4 in order toward one side in the thickness direction.
  • 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 total light transmittance of the glass plate 2 is, for example, 80% or more, preferably 85% or more, and for example, 99% or less.
  • 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 thickness of the glass plate 2 is less than 40 ⁇ m. If the thickness of the glass plate 2 is sufficiently thick, the impact resistance is improved. From this point of view, it is considered that the thicker the glass plate 2 is, the more the impact resistance is improved.
  • the impact resistance of the glass plate 2 having a thickness of less than 40 ⁇ m can be improved as compared with the glass plate 2 having a thickness of 50 ⁇ m.
  • the thickness of the glass plate 2 is preferably 37 ⁇ m or less, more preferably 35 ⁇ m or less, and further preferably 32 ⁇ m or less.
  • the thickness of the glass plate 2 is, for example, 5 ⁇ m or more, preferably 10 ⁇ m or more. Since the glass plate 2 has the above-mentioned thickness, it is called a thin glass plate.
  • the adhesive layer 3 extends in the plane direction.
  • the adhesive layer 3 is arranged on one side of the glass plate 2 in the thickness direction. Specifically, the adhesive layer 3 comes into 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 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, preferably an active energy curing type.
  • Specific examples of the curable adhesive include an acrylic adhesive composition, an epoxy adhesive composition, and a silicone adhesive composition. From the viewpoint of obtaining excellent impact resistance, an epoxy adhesive is used. The composition may be mentioned.
  • the epoxy adhesive composition contains an epoxy resin as a main component.
  • the epoxy resin include a bifunctional epoxy resin containing two epoxy groups and a polyfunctional epoxy resin containing three or more epoxy groups. These can be used alone or in combination of two or more. A combination of the bifunctional epoxy resin and the polyfunctional epoxy resin is preferable.
  • the bifunctional epoxy resin examples include aromatic epoxy resins such as bisphenol type epoxy resin, novolak type epoxy resin, naphthalene type epoxy resin, fluorene type epoxy resin, and triphenylmethane type epoxy resin, for example, triepoxypropyl isocyanurate. , Hydant-in epoxy resin and other nitrogen-containing ring epoxy resins, and examples thereof include aliphatic type epoxy resins, glycidyl ether type epoxy resins, and glycidylamine type epoxy resins. As the bifunctional epoxy resin, an aliphatic type epoxy resin is preferable.
  • the aliphatic epoxy resin includes an aliphatic alicyclic epoxy resin.
  • the epoxy equivalent of the bifunctional epoxy resin is, for example, 100 g / eq. As mentioned above, preferably 120 g / eq. The above, and for example, 250 g / eq. Hereinafter, preferably, 150 g / eq. It is as follows.
  • the ratio of the bifunctional epoxy resin in the epoxy resin is, for example, 80% by mass or more, preferably 90% by mass or more, and for example, 99% by mass or less, preferably 97% by mass or less.
  • polyfunctional epoxy resin examples include phenol novolac type epoxy resin, cresol novolac type epoxy resin, trishydroxyphenylmethane type epoxy resin, tetraphenylol ethane type epoxy resin, dicyclopentadiene type epoxy resin, and trifunctional aliphatic epoxy resin.
  • polyfunctional epoxy resins having three or more functionalities such as.
  • the polyfunctional epoxy resin is preferably a trifunctional aliphatic epoxy resin.
  • the epoxy equivalent of the polyfunctional epoxy resin is, for example, 130 g / eq. As mentioned above, preferably 150 g / eq. The above, and for example, 220 g / eq. Hereinafter, preferably, 200 g / eq. It is as follows.
  • the proportion of the polyfunctional epoxy resin in the epoxy resin is, for example, 1% by mass or more, preferably 3% by mass or more, and for example, 20% by mass or less, preferably 10% by mass or less.
  • the proportion of the epoxy resin in the epoxy adhesive composition is, for example, 60% by mass or more, preferably 75% by mass or more, and for example, 90% by mass or less, preferably 80% by mass or less.
  • the epoxy resin a commercially available product can be used, and as the aliphatic alicyclic epoxy resin, seroxide 2021P (manufactured by Daicel Chemical Co., Ltd.) and EHPE3150 (manufactured by Daicel Chemical Co., Ltd.) are used as the trifunctional aliphatic epoxy resin.
  • the epoxy adhesive composition contains a photoacid generator if it is an active energy curable type.
  • the photoacid generator include triarylsulfonium salts and the like.
  • the photoacid generator a commercially available product can be used, and CPI101A (manufactured by San Afro) or the like is used as the triarylsulfonium salt.
  • the proportion of the photoacid generator in the epoxy adhesive composition is, for example, 1% by mass or more, preferably 10% by mass or more, and for example, 30% by mass or less, preferably 20% by mass or less.
  • the epoxy adhesive composition can contain additives such as an oxetane-based resin and a silane coupling agent in an appropriate ratio.
  • oxetane-based resin examples include monofunctional oxetane such as 3-ethyl-3-oxetanemethanol and 2-ethylhexyloxetane, for example, xylylenebis oxetane, 3-ethyl-3 ⁇ [(3-ethyloxetane-3-yl). ) Bifunctional oxetane such as methoxy] methyl ⁇ oxetane.
  • oxetane-based resin a commercially available product can be used, and Aron oxetane (manufactured by Toagosei Co., Ltd.) or the like is used.
  • silane coupling agent examples include an epoxy group-containing silane coupling agent such as 3-glycidoxypropyltrimethoxysilane.
  • silane coupling agent a commercially available product can be used, and examples thereof include KBM series (manufactured by Shin-Etsu Silicone Co., Ltd.).
  • the thickness of the adhesive layer 3 is not limited.
  • 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 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 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 less. be.
  • the tensile storage elastic modulus E'of the adhesive layer 3 at 25 ° C. is determined 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.
  • measured by the nanoindenter method 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 also. For example, it is 100 GPa or less.
  • the measurement conditions of the nanoindenter method are as follows.
  • the film 4 forms one side of the optical laminate 1 in the thickness direction.
  • the film 4 is located on the opposite side of the glass plate 2 with respect to the adhesive layer 3.
  • the film 4 extends in the plane direction.
  • the film 4 is arranged on one side of the adhesive layer 3 in the thickness direction.
  • the film 4 is in contact with one side 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 film 4 in the thickness direction, and the glass plate 2 and the film 4 are bonded (bonded) to each other.
  • ⁇ Average of tan ⁇ of film 4> The average tan ⁇ of the film 4 at -100 ° C to -50 ° C determined by the dynamic viscoelasticity test in the frequency of 10 Hz, the heating rate of 2 ° C / min, the data acquisition interval of 0.5 min, and the tensile mode is 0.04 or more. be. If the average of tan ⁇ of the film 4 from ⁇ 100 ° C. to ⁇ 50 ° C. is less than 0.04, the impact resistance of the optical laminate 1 is lowered.
  • the average of the tan ⁇ of the film 4 at ⁇ 100 ° C. to ⁇ 50 ° C. is an index showing the responsiveness when the object collides with the optical laminate 1 at high speed. If the average of tan ⁇ is high, the impact received by the glass plate 2 can be sufficiently alleviated by the film 4, and the impact resistance of the optical laminate 1 can be improved.
  • the average tan ⁇ of the film 4 from ⁇ 100 ° C. to ⁇ 50 ° C. is preferably 0.05 or more, more preferably 0.06 or more.
  • the upper limit of the average tan ⁇ of the film 4 from ⁇ 100 ° C. to ⁇ 50 ° C. is not limited.
  • the average of tan ⁇ of the film 4 from ⁇ 100 ° C. to ⁇ 50 ° C. is, for example, 0.50 or less.
  • the dynamic viscoelasticity test will be described in later examples.
  • ⁇ Average tensile storage elastic modulus E'of film 4 The average tensile storage elastic modulus E'of the film 4 at a frequency of 10 Hz, a heating rate of 2 ° C./min, and a dynamic viscoelasticity test in a tensile mode from -100 ° C to -50 ° C is 3 GPa or more and 6 GPa or less. ..
  • the average tensile storage elastic modulus E'of the film 4 from ⁇ 100 ° C. to ⁇ 50 ° C. exceeds 6 GPa, the film 4 becomes too hard and the impact resistance of the optical laminate 1 deteriorates.
  • the film 4 is too soft, and as a result, the impact resistance of the optical laminate 1 is sufficiently improved. Can not.
  • the average tensile storage elastic modulus E'of the film 4 from ⁇ 100 ° C. to ⁇ 50 ° C. is preferably 4.5 GP or more, more preferably 5.0 GP or more, and preferably 5.5 GPa or less. be.
  • Examples of the film 4 include a polyester film and a cell roll film.
  • Examples of the polyester film include polyethylene terephthalate film (PET), polybutylene terephthalate (PBT) film, and polyethylene naphthalate (PEN) film.
  • Examples of the cell roll film include acetyl cell roll fill, and specific examples thereof include a triacetyl cell roll (TAC) film.
  • 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 4 is not limited.
  • the thickness of the film 4 is, for example, 10 ⁇ m or more, preferably 20 ⁇ m or more, more preferably 30 ⁇ m or more, and for example, 150 ⁇ m or less, preferably 80 ⁇ m or less.
  • the thickness of the film 4 is not less than the above lower limit and not more than the upper limit, the impact resistance of the optical laminate 1 can be improved.
  • the total light transmittance of the film 4 is, for example, 80% or more, preferably 85% or more, and for example, 99% or less.
  • the thickness of the optical laminate 1 is, for example, 25 ⁇ m or more, and for example, 200 ⁇ m or less.
  • 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. That is, the optical laminate 9 with the pressure-sensitive adhesive layer includes the glass plate 2, the adhesive layer 3, the film 4, and the pressure-sensitive adhesive layer 12 in order toward one side 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 film 4 in the thickness direction. Specifically, the pressure-sensitive adhesive layer 12 is in contact with one side of the film 4 in the thickness direction.
  • the pressure-sensitive adhesive layer 12 is an adhesive body that is pressure-sensitively adhered without a curing reaction.
  • the material of the pressure-sensitive adhesive layer 12 is not limited.
  • Examples of 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 adhesives, epoxy adhesives, and polyether adhesives. As the material, an acrylic pressure-sensitive adhesive is preferable. The formulation and physical properties of the pressure-sensitive adhesive layer 12 are described in detail in, for example, Japanese Patent Application Laid-Open No. 2018-28873.
  • the shear storage elastic modulus G'at 25 ° C. of the pressure-sensitive adhesive layer 12 is, for example, 0.01 MPa or more, and for example 0.20 MPa or less.
  • the shear storage elastic modulus G' is determined by a dynamic viscoelasticity test at a frequency of 1 Hz, a heating rate of 5 ° C./min, and a shear (twist) mode.
  • 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 30 ⁇ m or less, more preferably 20 ⁇ m or less.
  • the thickness of the pressure-sensitive adhesive layer 12 is not more than the above-mentioned upper limit, the impact resistance of the optical laminate 1 can be improved.
  • the thickness of the pressure-sensitive adhesive layer 12 is equal to or greater than the above-mentioned lower limit, the film 4 can be reliably attached to the conductive film 13 described later.
  • 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.
  • a method for manufacturing the optical laminate 1 and the optical laminate 9 with an adhesive layer will be described.
  • a curable adhesive is placed (applied) on one side in the thickness direction of the glass plate 2 and / or the other side in the thickness direction of the film 4, and then the glass plate 2 is manufactured. And the film 4 sandwiches the curable adhesive.
  • the curable adhesive is cured.
  • the curable adhesive is an active energy curable type
  • the curable adhesive is irradiated with active energy including 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 film 4 is formed.
  • the optical laminate 9 with the adhesive layer is manufactured.
  • the pressure-sensitive adhesive layer 12 is arranged on one side of the film 4 in the thickness direction.
  • a varnish containing an adhesive is applied and dried on one side of the film 4 in the thickness direction.
  • the pressure-sensitive adhesive layer 12 formed on the release sheet can be transferred to one side of the film 4 in the thickness direction.
  • An optical laminate 9 with an adhesive layer may be provided with a release sheet (not shown).
  • the optical laminate 9 with an adhesive layer includes a glass plate 2, an adhesive layer 3, a film 4, an adhesive layer 12, and a release sheet (not shown).
  • the optical laminate 1 and the optical laminate 9 with an adhesive layer are used for various optical applications, and are provided in, for example, an image display device.
  • the image display device include 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. 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 9 with a pressure-sensitive adhesive layer, 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).
  • optical laminate with adhesive layer 9 includes a glass plate 2, an adhesive layer 3, a film 4, and an adhesive layer 12 in this order toward the back side.
  • 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 composite oxides. Examples of the composite oxide include indium zinc composite oxide (IZO), indium gallium zinc composite oxide (IGZO), indium gallium composite oxide (IGO), indium tin composite oxide (ITO), and antimonthine composite. Oxide (ATO) can be mentioned.
  • Examples of conductive fibers include metal nanowires and carbon nanotubes. Metals include, for example, gold, platinum, silver, and copper.
  • 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, and JP-A-2014-219667.
  • 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 include olefin resin, polyester resin, (meth) acrylic resin, polycarbonate resin, polyether sulfone resin, polyarylate resin, melamine resin, polyamide resin, polyimide resin, cellulose resin, and polystyrene resin. Can be mentioned.
  • the olefin resin include polyethylene, polypropylene, and cycloolefin polymer (COP).
  • the polyester resin include PET, PBT, and PEN.
  • the (meth) acrylic resin include poly (meth) acrylate resins. 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 and physical properties of the image display member 15 are described in detail in, for example, Japanese Patent Application Laid-Open No. 2018-28873.
  • the glass plate 2 is made thin according to the conventional common general knowledge, the impact resistance of the optical laminate 1 is lowered.
  • the glass plate 2 is as thin as less than 40 ⁇ m
  • the glass plate 2 and the film 4 are laminated via the adhesive layer 3, and the tan ⁇ of the film 4 at ⁇ 100 ° C. to ⁇ 50 ° C. Since the average of the tensile storage elastic modulus E'of the film 4 from -100 ° C to -50 ° C is 3 GPa or more and 6 GPa or less, the optical laminate 1 has an impact resistance. Excellent.
  • the impact resistance of the optical laminate 1 can be further improved.
  • the film 4 has a thickness of 80 ⁇ m or less, the impact resistance of the optical laminate 1 can be further improved.
  • the impact resistance of the optical laminate 1 can be further improved.
  • the thickness of the pressure-sensitive adhesive layer 12 is 20 ⁇ m or less, the impact resistance of the optical laminate 9 with the pressure-sensitive adhesive layer can be further improved.
  • the film 4 is a single layer, but the number of layers of the film 4 is not limited.
  • the film 4 may have a plurality of layers.
  • the optical laminate 1 can further include a functional layer 37.
  • the functional layer 37 is arranged on the other surface of the glass plate 2 in the thickness direction.
  • Examples of the functional layer 37 include a hard coat layer, an anti-scattering layer, an anti-fouling layer, and an anti-reflection layer. These may be a single layer or a plurality of these may be laminated.
  • the optical laminate of the present invention has excellent impact resistance, even a glass plate having a thickness of less than 40 ⁇ m has sufficient impact resistance. Since a glass plate having a thickness of less than 40 ⁇ m is excellent in flexibility, the optical laminate of the present invention can be suitably used for flexible displays such as foldable displays and rollable displays.
  • the optical laminate 1 was manufactured, and then the pressure-sensitive adhesive layer 12 was arranged on the optical laminate 1 to manufacture the optical laminate 9 with the pressure-sensitive adhesive layer. That is, the pressure-sensitive adhesive layer 12 was arranged on the optical laminate 1, and the impact resistance of the optical laminate 1 was evaluated.
  • Example 1 A glass plate 2 (G-leaf) having a thickness of 30 ⁇ m and a film 4 (Diafoil S100, manufactured by Mitsubishi Chemical Corporation) made of a polyethylene terephthalate film having a thickness of 50 ⁇ m were prepared.
  • 70 parts by mass of an aliphatic alicyclic epoxy resin (celloxide 2021P, epoxy equivalent 128 to 133 g / eq., Manufactured by Daicel Chemical Co., Ltd.), a trifunctional aliphatic epoxy resin (EHPE3150, epoxy equivalent 170 to 190 g / eq., Daicel).
  • epoxy adhesive composition was prepared by blending 2 parts by mass and 2 parts by mass of a photoacid generator (CPI101A, triarylsulfonium salt, manufactured by San Afro). This epoxy adhesive composition was applied to the glass plate 2, and then the epoxy adhesive composition was sandwiched between the glass plate 2 and the film 4.
  • a photoacid generator CPI101A, triarylsulfonium salt, manufactured by San Afro. This epoxy adhesive composition was applied to the glass plate 2, and then the epoxy adhesive composition was sandwiched between the glass plate 2 and the film 4.
  • the curable adhesive was irradiated with ultraviolet rays from the glass plate 2 side.
  • an adhesive layer 3 having a thickness of 1 ⁇ m made of a cured body that firmly adheres the glass plate 2 and the film 4 was formed.
  • the elastic modulus of the adhesive layer 3 at 25 ° C. measured by the nanoindenter method was 4.9 GPa.
  • the optical laminate 1 including the glass plate 2, the adhesive layer 3, and the film 4 was manufactured.
  • the pressure-sensitive adhesive layer 12 having a thickness of 15 ⁇ m was placed on one side of the film 4 in the thickness direction by transfer.
  • 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 shear storage elastic modulus G'at 25 ° C. of the pressure-sensitive adhesive layer 12 was 0.03 MPa.
  • the measurement method is as follows.
  • the pressure-sensitive adhesive layer 12 is externally processed into a disk shape, sandwiched between parallel plates, and the pressure-sensitive adhesive layer 12 is measured by dynamic viscoelasticity measurement under the following conditions using "Advanced Shearometric Exhibition System (ARES)” manufactured by Shearetic Scientific.
  • the shear storage elastic modulus G'at 25 ° C. was determined.
  • an optical laminate 9 with an adhesive layer including a glass plate 2, an adhesive layer 3, a film 4, and an adhesive layer 12 was manufactured.
  • Comparative Example 1 The optical laminate 1 was manufactured in the same manner as in Example 1, and subsequently, the optical laminate 9 with the pressure-sensitive adhesive layer was manufactured. However, the thickness of the glass plate 2 was changed to 50 ⁇ m.
  • Example 2 The optical laminate 1 was manufactured in the same manner as in Example 1, and subsequently, the optical laminate 9 with the pressure-sensitive adhesive layer was manufactured. However, the thickness of the film 4 was changed to 25 ⁇ m.
  • Example 3 The optical laminate 1 was manufactured in the same manner as in Example 1, and subsequently, the optical laminate 9 with the pressure-sensitive adhesive layer was manufactured. However, the thickness of the film 4 was changed to 100 ⁇ m.
  • Example 4 The optical laminate 1 was manufactured in the same manner as in Example 1, and subsequently, the optical laminate 9 with the pressure-sensitive adhesive layer was manufactured. However, as the film 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 2 The optical laminate 1 was manufactured in the same manner as in Example 4, and subsequently, the optical laminate 9 with the pressure-sensitive adhesive layer was manufactured. However, the thickness of the glass plate 2 was changed to 50 ⁇ m.
  • Comparative Example 3 The optical laminate 1 was manufactured in the same manner as in Example 1, and subsequently, the optical laminate 9 with the pressure-sensitive adhesive layer was manufactured. However, as the film 4, a methacrylic resin pellet having a glutarimide ring unit was formed into a film by extrusion molding, and then a stretched acrylic film was used. The thickness of the acrylic film was 40 ⁇ m.
  • Comparative Example 4 The optical laminate 1 was manufactured in the same manner as in Example 1, and subsequently, the optical laminate 9 with the pressure-sensitive adhesive layer was manufactured. However, as the film 4, a polarizing film having a thickness of 51 ⁇ m was used. The polarizing film was prepared as follows.
  • the polarizing film includes a polarizing element protective film, a second adhesive layer, a polarizing element, a third adhesive layer, and an optical compensation layer in order in the thickness direction.
  • the polarizing element protective film is an acrylic film having a thickness of 40 ⁇ m used in Comparative Example 3.
  • the polarizing element is the stretched PVA film described in Example 1 of JP-A-2017-102443.
  • the optical compensation layer is the ⁇ / 4 plate and the ⁇ / 2 plate described in Example 4 of JP-A-2017-102443.
  • the respective materials of the second adhesive layer and the third adhesive layer are the same as the materials of the adhesive layer of Example 1.
  • the thickness of the polarizing element protective film is 40 ⁇ m
  • the thickness of the second adhesive layer is 1 ⁇ m
  • the thickness of the polarizing element is 5 ⁇ m
  • the thickness of the third adhesive layer is 1 ⁇ m
  • the thickness of the optical compensation layer is 4 ⁇ m. Therefore, the thickness of the polarizing film is 51 ⁇ m.
  • Examples 5 to 8 and Comparative Examples 5 to 6 The optical laminate 1 is formed in the same manner as in Examples 5 to 8 and Comparative Examples 5 to 6 in the same manner as in Examples 1 to 4 and Comparative Example 1 to Comparative Example 2. Manufactured, followed by and manufactured an optical laminate 9 with an adhesive layer. However, in each of Example 5 to Example 8 and Comparative Example 5 to Comparative Example 6, the thickness of the pressure-sensitive adhesive layer 12 was changed to 25 ⁇ m. That is, the impact resistance of the optical laminate 1 was verified with the pressure-sensitive adhesive layers 12 having different thicknesses.
  • Tables 1 to 7 describe the thickness of the glass plate 2, the type and thickness of the film 4, and the thickness of the pressure-sensitive adhesive layer 12 in each Example and each Comparative Example. There are examples that are duplicated in multiple tables. This is for facilitating the comparison between the examples and the comparative examples and the comparison between the examples.
  • Each of the average tensile storage elastic moduli E'of the film 4 from -100 ° C to -50 ° C was calculated by dividing the sum of all the above acquired data from -100 ° C to -50 ° C by the number of data. ..
  • Each of the averages of tan ⁇ of film 4 from ⁇ 100 ° C. to ⁇ 50 ° C. was calculated by dividing the sum of all the above-mentioned acquired data from ⁇ 100 ° C. to ⁇ 50 ° C. by the number of data.
  • ⁇ Pen drop crack test> The following pen drop cracking test was carried out on the optical laminate 9 with the pressure-sensitive adhesive layer of each Example and each Comparative Example. As shown by the virtual line in FIG. 1, first, the optical laminate 9 with the adhesive layer was placed on the surface of the resin film 34 so that the glass plate 2 faces upward. Specifically, the pressure-sensitive adhesive layer 12 was attached to the surface of the resin film 34.
  • the resin film 34 is a prescale (a monosheet type for prescale MS medium pressure manufactured by Fujifilm, thickness 95 ⁇ m). The resin film 34 is arranged on the surface of a horizontal table (not shown).
  • a pen drop cracking test is carried out in which a 7 g pen 29 (Pentel ballpoint pen BK407 black, ball diameter 0.7 mm) is dropped from a height of 5 cm from the glass plate 2.
  • the height of 5 cm described above is the distance between one side of the glass plate 2 in the thickness direction and the tip portion 32 of the pen 29. The tip portion 32 faces downward and is sharp.
  • the height H1 of the pen drop cracking test becomes 5 cm. If the glass plate 2 does not crack, the height is gradually increased by 1 cm. As a result, the height H1 when the glass plate 2 is cracked is obtained.
  • Example 1 ⁇ Comparison of each example and each comparative example> ⁇ Evaluation of the thickness of the glass plate 2> The thickness of the glass plate 2 is evaluated.
  • Example 1 and Comparative Example 1 shown in Table 1 are compared.
  • the thickness of the glass plate 2 of Example 1 is 30 ⁇ m.
  • the thickness of the glass plate 2 of Comparative Example 1 is 50 ⁇ m.
  • the height H1 25 cm of the pen drop cracking test of Example 1 is higher than the height H1 20 cm of the pen drop cracking test of Comparative Example 1. Therefore, it can be seen that the impact resistance of the optical laminate 9 with the adhesive layer is improved by reducing the thickness of the glass plate 2 to less than 40 ⁇ m.
  • Example 4 and Comparative Example 3 shown in Table 4 are compared.
  • the average tan ⁇ of the film 4 from ⁇ 100 ° C. to ⁇ 50 ° C. in Example 4 is 0.047.
  • the average tan ⁇ of the film 4 from ⁇ 100 ° C. to ⁇ 50 ° C. in Example 3 is 0.039.
  • the height H1 17 cm of the pen drop cracking test of Example 4 is higher than the height H1 10 cm of the pen drop cracking test of Comparative Example 3. Therefore, it can be seen that the impact resistance of the optical laminate 9 with the pressure-sensitive adhesive layer is improved by setting the average of tan ⁇ of the film 4 from ⁇ 100 ° C. to ⁇ 50 ° C. to 0.04 or more.
  • Example 1 shown in Table 4 is compared with Comparative Example 4.
  • the average tensile storage elastic modulus E'of the film 4 from ⁇ 100 ° C. to ⁇ 50 ° C. in Example 1 is 5.1 GPa.
  • the average of tan ⁇ of the film 4 from ⁇ 100 ° C. to ⁇ 50 ° C. in Comparative Example 4 is 8.2 GPa.
  • the height H1 25 cm of the pen drop cracking test of Example 1 is higher than the height H17 cm of the pen drop cracking test of Comparative Example 4. Therefore, it can be seen that the impact resistance of the optical laminate 9 with the pressure-sensitive adhesive layer is improved by setting the average tensile storage elastic modulus E'of the film 4 from ⁇ 100 ° C. to ⁇ 50 ° C. to 6 GPa or less.
  • Example 5, Example 6 and Example 7 shown in Table 6 are compared.
  • the thickness of the film 4 of Example 5 is 50 ⁇ m.
  • the thickness of the film 4 of Example 6 is 25 ⁇ m.
  • the thickness of the film 4 of Example 7 is 100 ⁇ m.
  • the height of the pen drop cracking test of Example 7 is H1 10 cm, the height of the pen drop cracking test of Example 5 is H1 20 cm, and the height of the pen drop cracking test of Example 6 is H1 17 cm, respectively. expensive. Therefore, it can be seen that the impact resistance of the optical laminate 9 with the pressure-sensitive adhesive layer is improved by reducing the thickness of the film 4 to 80 ⁇ m or less.
  • Example 1 and Example 2 shown in Table 2 are compared with Example 8 shown in Table 7.
  • the film 4 is a PET film and has a thickness of 50 ⁇ m and 25 ⁇ m, respectively.
  • Example 8 the film 4 is a TAC film and has a thickness of 40 ⁇ m.
  • the thickness of the film 4 is different between Example 1, Example 2, and Example 8. However, considering that the height H1 of each of the pen drop cracking test of Example 1 in which the thickness of the film 4 is 50 ⁇ m and Example 2 in which the thickness of the film 4 is 25 ⁇ m is 25 cm, the thickness is 40 ⁇ m.
  • the height H1 of the pen drop cracking test of the optical laminate 9 with the pressure-sensitive adhesive layer provided with the PET film is estimated to be 25 cm.
  • the height H1 of the pen drop cracking test of Example 8 is 10 cm. That is, it can be said that the height H1 of the pen drop cracking test of Example 1 in which the film 4 is a PET film is higher than the height H1 of the pen drop cracking test of Example 8 in which the film 4 is a TAC film. Therefore, it can be seen that the impact resistance of the optical laminate 9 with the pressure-sensitive adhesive layer is improved by changing the film 4 to a PET film.
  • Example 1 shown in Table 1 is compared with Example 5 shown in Table 5.
  • the thickness of the pressure-sensitive adhesive layer 12 of Example 1 is 15 ⁇ m.
  • the thickness of the pressure-sensitive adhesive layer 12 of Example 5 is 25 ⁇ m.
  • Height H1 of the pen drop cracking test of Example 5 The height H125 cm of the pen drop cracking test of Example 1 is higher than 20 cm. Therefore, it can be seen that the impact resistance of the optical laminate 9 with the pressure-sensitive adhesive layer is improved by reducing the thickness of the pressure-sensitive adhesive layer 12 to 20 ⁇ m or less.
  • the optical laminate is provided in the optical laminate with an adhesive layer.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Theoretical Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

Le problème décrit par la présente invention est de fournir un stratifié optique et un stratifié optique fixé par une couche adhésive présentant une excellente résistance aux chocs. La solution selon l'invention porte sur un stratifié optique 1 qui comprend une plaque de verre 2, une couche adhésive 3 et un film 4 dans l'ordre indiqué en direction d'un côté dans le sens de l'épaisseur. La plaque de verre 2 présente une épaisseur inférieure à 40 µm. La moyenne de tan δ du film 4 à une température comprise entre -100 °C et -50 °C, mesurée au moyen d'un test de viscoélasticité dynamique dans un mode de traction à une fréquence de 10 Hz et un taux de chauffage de 2 °C/min, est supérieure ou égale à 0,04. La moyenne d'un module élastique de glissement en traction E' du film 4 à une température comprise entre -100 °C et -50 °C, mesurée au moyen du test de viscoélasticité dynamique, est comprise entre 3 GPa et 6 GPa.
PCT/JP2021/018804 2020-06-24 2021-05-18 Stratifié optique et stratifié optique fixé par une couche adhésive WO2021261118A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008273211A (ja) * 2008-05-19 2008-11-13 Nitto Denko Corp 透明ガスバリア性部材及びこれを用いた有機エレクトロルミネッセンス素子
JP2019025899A (ja) * 2017-07-28 2019-02-21 株式会社ダイセル 積層体、及び前記積層体を備えたフレキシブルデバイス

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008273211A (ja) * 2008-05-19 2008-11-13 Nitto Denko Corp 透明ガスバリア性部材及びこれを用いた有機エレクトロルミネッセンス素子
JP2019025899A (ja) * 2017-07-28 2019-02-21 株式会社ダイセル 積層体、及び前記積層体を備えたフレキシブルデバイス

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