CN115461704A - Flexible laminate and display device - Google Patents
Flexible laminate and display device Download PDFInfo
- Publication number
- CN115461704A CN115461704A CN202180030800.6A CN202180030800A CN115461704A CN 115461704 A CN115461704 A CN 115461704A CN 202180030800 A CN202180030800 A CN 202180030800A CN 115461704 A CN115461704 A CN 115461704A
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- China
- Prior art keywords
- layer
- film
- touch sensor
- flexible laminate
- sensor layer
- Prior art date
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- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
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- 238000010897 surface acoustic wave method Methods 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
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- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Images
Classifications
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- 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
- B32B17/10036—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 two outer glass sheets
- B32B17/10045—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 two outer glass sheets with at least one intermediate layer consisting of a glass sheet
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- 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
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- 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
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- 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
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- 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
- B32B17/10724—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 polyamide
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- 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
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- G—PHYSICS
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- G02B5/00—Optical elements other than lenses
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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- 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
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- 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
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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
- 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
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- 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
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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
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- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
- B32B2457/208—Touch screens
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Human Computer Interaction (AREA)
- Electroluminescent Light Sources (AREA)
- Laminated Bodies (AREA)
- Polarising Elements (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The purpose of the present invention is to improve the impact-mitigating effect on a lower structure connected to a laminate, such as an organic EL layer and an organic EL panel, while maintaining flexibility (flexibility). A flexible laminate having a window film on the viewing side, a polarizing plate, and a touch sensor layer, further comprising a glass plate having a thickness of 10 to 100 [ mu ] m laminated on the touch sensor layer.
Description
Technical Field
The present invention relates to a flexible laminate, and particularly to a flexible laminate having excellent impact resistance.
Background
In recent years, organic EL displays using organic EL as display elements have rapidly spread. Among the organic EL displays, a touch panel integrated organic EL display operates by touching the surface of a display device. Depending on the kind of operation, not only the surface is sometimes rubbed, but also the surface is sometimes tapped.
Organic EL displays are generally thin. Therefore, the display may be damaged when the operation is performed, and the display device is required to have the following performance: not only friction against the surface but also a force sharply applied to the vertical direction from the visible side can be endured while flexibility (flexibility) is maintained.
Patent document 1 describes a touch panel-equipped display device in which a touch panel is mounted on a display panel via an antireflection layer or an adhesive layer on the polarizer side of the display device in which a polarizing plate is laminated on the display panel, wherein the polarizing plate includes a polarizer and a film laminated on the polarizer on the touch panel side and having a film thickness of 35 μm or less, and a contact angle of the surface of the film on the touch panel side is less than 60 ° (claim 1). In the display device with a touch panel, the polarizing plate is formed to be thin, and peeling of the antireflection layer and the adhesive layer is suppressed, thereby preventing a reduction in visibility of the display device (paragraph [0017 ]).
Patent document 2 describes a polyimide film having a hard coat layer on one surface of a polyimide substrate and a transparent electrode layer on the other surface. The plastic substrate has excellent light transmittance, satisfies high hardness, ITO processability, and flexibility, and functions as a window film and an electrode when used in a touch panel (abstract).
Documents of the prior art
Patent document
Patent document 1: international publication No. 2014/038466
Patent document 2: japanese laid-open patent publication No. 2015-508345
Disclosure of Invention
However, the laminate described in patent document 1 is configured only by sandwiching a film such as an acrylic resin between the upper and lower sides of a polarizer of a polarizing plate existing in a display device, and the impact-mitigating effect on a display panel located at the lower portion of the laminate is insufficient.
In addition, although the laminate described in patent document 2 uses a relatively rigid plastic substrate, even if it is used for a display device, the impact-mitigating effect on the lower portion of the laminate is still insufficient, and further, the flexibility may be lowered.
The present invention has been made to solve the above-described problems of the conventional laminate, and an object of the present invention is to provide a flexible laminate which can improve the impact relaxation effect on a lower structure connected to the laminate, such as an organic EL layer and an organic EL panel, while maintaining flexibility (flexibility).
The invention provides a flexible laminate which comprises a window film, a polarizing plate and a touch sensor layer positioned on a visible side, and further comprises a glass plate having a thickness of 10 to 100 [ mu ] m laminated on the touch sensor layer.
In one embodiment, the flexible laminate includes a window film, a touch sensor layer, and a polarizing plate in this order on the visible side.
In one embodiment, the flexible laminate includes a window film, a polarizing plate, and a touch sensor layer in this order on the viewing side.
In one embodiment, the flexible laminate is for an organic EL display device.
The present invention also provides an organic EL display device including an organic EL layer and any one of the flexible laminates described above laminated on the visible side of the organic EL layer.
In one aspect, the organic EL display device has a bending resistance such that when an operation of bending and stretching the organic EL display device by 180 ° with a bending radius of 3mm is repeated 10 ten thousand times with the window film located on the viewing side as the inner side, the glass plate is not cracked or broken.
According to the present invention, there is provided a flexible laminate which improves an impact relaxation effect on a lower structure connected to the laminate while maintaining flexibility (flexibility).
Drawings
Fig. 1A is a sectional view showing an example of the structure of the flexible laminate of the present invention.
Fig. 1B is a sectional view showing an example of the structure of the flexible laminate of the present invention.
Fig. 1C is a sectional view showing an example of the structure of the flexible laminate of the present invention.
Fig. 1D is a sectional view showing an example of the structure of the flexible laminate of the present invention.
Fig. 2 is a sectional view showing an example of the structure of a display device of the present invention further having a lower structure (only the flexible laminate of fig. 1D is illustrated).
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[ Flexible laminate ]
Fig. 1 is a sectional view showing an example of the structure of a flexible laminate 100 of the present invention. The flexible laminate 100 of fig. 1 includes: a window film 10 on the viewing side, a polarizing plate 40, and a touch sensor layer 30, and further has a glass plate having a thickness of 10 to 100 μm laminated on the entire touch sensor layer 30.
The flexible laminate 100 shown in fig. 1A includes, in order: a window film 10 on the viewing side, a touch sensor layer 30 in which a glass plate 20 is laminated on the entire upper portion, and a polarizing plate 40.
The flexible laminate 100 shown in fig. 1B has, in order: a window film 10 positioned on the viewing side, a touch sensor layer 30 in which a glass plate 20 is laminated on the entire lower portion, and a polarizing plate 40.
The flexible laminate 100 shown in fig. 1C includes, in order: a window film 10 positioned on the viewing side, a polarizing plate 40, and a touch sensor layer 30 in which a glass plate 20 is laminated on the entire upper portion.
The flexible laminate 100 shown in fig. 1D sequentially includes: a window film 10 on the viewing side, a polarizing plate 40, and a touch sensor layer 30 in which a glass plate 20 is laminated on the entire lower portion.
The window film 10 positioned on the viewing side, the touch sensor layer 30 in which the glass plate 20 is laminated on at least one of the entire upper portion and the entire lower portion, and the polarizing plate 40 are bonded to each other via an adhesive layer or an adhesive layer (hereinafter, both may be collectively referred to as an adhesive/adhesive layer) described later. The bonding/adhesive layer is not shown for simplicity.
As shown in fig. 2, the flexible laminate 100 of fig. 1A to 1D is further connected to the lower structure 50 via an adhesive layer (not shown).
[ Window film ]
The window film 10 of the flexible laminate 100 constitutes a viewing surface which is the uppermost portion of the flexible laminate 100. The window film is a plate-like layer having light transmittance. The window film may be composed of 2 or more layers. Examples of the window film include a plate-like body made of resin (e.g., a resin plate, a resin sheet, a resin film, etc.), a plate-like body made of glass (e.g., a glass plate, a glass film, etc.), and a laminate of a plate-like body made of resin and a plate-like body made of glass.
When the window film has a plate-like body made of a resin, examples of the material include acrylic resins such as polymethyl (meth) acrylate and ethyl (meth) acrylate; polyolefin resins such as polyethylene, polypropylene, polymethylpentene, and polystyrene; cellulose resins such as triacetyl cellulose, acetyl cellulose butyrate, propionyl cellulose, butyryl cellulose and acetyl propionyl cellulose; polyvinyl resins such as ethylene-vinyl acetate copolymers, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, and polyvinyl acetal; sulfone resins such as polysulfone and polyethersulfone; ketone resins such as polyether ketone and polyether ether ketone; a polyetherimide; a polycarbonate-based resin; a polyester resin; a polyimide-based resin; a polyamide imide resin; and polyamide resins. These resins may be used alone or in combination of 2 or more. Among them, from the viewpoint of improving strength and transparency, a polycarbonate-based resin, a polyester-based resin, a polyimide-based resin, a polyamideimide-based resin, or a polyamide-based resin is preferably used.
The window film 10 may be a film made of the above resin, or may have a hard coat layer on at least one surface of the film. The hard coat layer may be formed on the outer surface of the film or on both surfaces. By providing the hard coat layer, a resin film having improved hardness and scratch resistance can be produced. The hard coat layer is a cured layer of, for example, an ultraviolet curable resin. Examples of the ultraviolet curable resin include acrylic resins, silicone resins, polyester resins, polyurethane resins, amide resins, and epoxy resins. To increase hardness, the hard coating may contain additives. The additive is not particularly limited as long as it does not inhibit the light transmittance of the window film, and inorganic fine particles, organic fine particles, or a mixture thereof may be used.
The glass plate-like body may be formed of the same material as that of the glass plate 20 described later.
When the flexible laminate 100 is used in a display device, the window film may further have a function as a touch sensor, a blue light cut-off function, a viewing angle adjustment function, and the like.
The thickness of the window film is, for example, 3 to 100. Mu.m, preferably 5 to 70 μm, and more preferably 10 to 60 μm.
[ glass plate ]
The glass plate 20 of the flexible laminate 100 is laminated on at least one of the entire upper portion and the entire lower portion of the touch sensor layer 30. Here, the entirety means a substantially entire surface covering the bending portion and the touch function region of the touch sensor layer 30. As the glass plate used, it is preferable to use chemically strengthened glass excellent in strength and light transmittance according to the object of the present invention. By using chemically strengthened glass, the impact resistance of the laminate can be improved while flexibility (flexibility) is maintained.
The glass sheets are preferably laminated as close as possible to the lower structure 50. This improves the impact resistance of the resulting display device. From the above point of view, the embodiment shown in fig. 1C and 1D is preferable among the embodiments shown in fig. 1A to 1D.
Chemically strengthened glass suitable for use in glass sheet 20 can be obtained by chemical ion exchange treatment of the glass. By partially replacing sodium ions and lithium ions on the glass surface with potassium ions having a larger ionic radius by chemical ion exchange treatment, the strength of the glass surface can be improved. The surface strength is improved by forming a thinner compressive stress layer. Examples of the glass used for the chemically strengthened glass include aluminosilicate glass, soda-lime glass, borosilicate glass, lead glass, alkali barium glass, and aluminoborosilicate glass.
The chemical ion exchange treatment can be performed by immersing the glass in an ion exchange melt heated to a melting point or higher, or by directly applying a paste-like ion exchange melt to the glass. Examples of the ion-exchange melt include potassium nitrate, potassium carbonate, potassium bicarbonate, potassium phosphate, potassium sulfate, and potassium hydroxide-based ion-exchange melts. Among them, potassium nitrate (330 ℃ C.) is preferable because its melting point is lower than that of glass (usually 500 ℃ C. To 600 ℃ C.), and handling is easy.
The glass can be made thin by etching before the chemical ion exchange treatment. The etching treatment may be performed using hydrofluoric acid or a mixture of hydrofluoric acid and an aqueous ammonium fluoride solution and an organic acid such as formic acid, acetic acid, propionic acid, or the like as a chemical treatment solution. They may be used for etching by spraying, dipping, or the like. The etching treatment may also use an inert gas containing fluorine as an etching gas, and for example, a gas containing CF 4 、C 3 F 8 、C 2 F 6 、XeF 2 He gas of at least 1 kind of the likeOr Ar gas. Specifically, the etching can be performed by converting an inert gas containing fluorine diluted with He gas or Ar gas into plasma at atmospheric pressure to release fluorine from the carbon fluoride.
The thickness of the glass plate used in the flexible laminate 100 is, for example, 10 to 100 μm, preferably 20 to 80 μm, and more preferably 30 to 60 μm. When the thickness of the glass plate is 10 μm or more, the impact resistance of the flexible laminate 100 can be improved and the glass plate is less likely to break. When the thickness of the glass plate is 100 μm or less, the flexibility (flexibility) of the flexible laminate can be improved.
[ touch sensor layer ]
The touch sensor layer 30 of the flexible laminate 100 includes a glass plate 20 (fig. 1) laminated on at least one of the entire upper portion and the entire lower portion. The glass plate 20 and the touch sensor layer 30 are bonded via an adhesive layer. The touch sensor layer 30 may be formed directly on the glass plate 20 without an adhesive layer. The glass plate 20 is preferably bonded to the touch sensor layer 30 via an ultraviolet curable adhesive layer. The touch sensor layer to which the glass plate is bonded is further bonded to at least one of the window film 10 and the polarizing plate 40 via an adhesive layer (not shown). The touch sensor layer 30 has a transparent conductive layer.
The detection method of the touch sensor layer is not particularly limited as long as it can detect a touched position on the window film, and may be appropriately selected from, for example, a capacitance method, a resistive film method, an optical sensor method, an ultrasonic wave method, an electromagnetic induction coupling method, a surface acoustic wave method, and the like. Among them, the electrostatic capacitance system is preferable from the viewpoint of low cost, rapid response, and reduction in film thickness.
In the case of the capacitive touch sensor, the touch sensor layer is composed of, for example, a base material, a transparent conductive layer for position detection formed on the base material, and a touch position detection circuit. When the surface of the window film is touched, the transparent conductive layer is grounded at the touched point via the electrostatic capacitance of the human body, and the touch position detection circuit detects the grounding of the transparent conductive layer, thereby detecting the touch position.
As the transparent conductive layer of the touch sensor layer, ITO (indium oxide/tin) is preferably used. The layer may be formed of a layer of another metal oxide as long as it is colorless and transparent, has excellent conductivity, and has excellent film-forming properties. The transparent conductive layer is preferably formed so as not to be seen when the touch sensor layer is used for a laminate.
The touch sensor layer may have a separation layer. The separation layer may be a layer having a function of easily separating the transparent conductive layer from the substrate in the manufacturing process of the touch sensor layer 30. For example, the transparent conductive layer may be separated from the substrate by forming an inorganic layer such as an organic silicon oxide or an organic layer such as a (meth) acrylic resin composition, an epoxy resin composition, or a polyimide resin composition on the substrate.
The touch sensor layer may further include at least 1 protective layer in addition to the separation layer, or may further include at least 1 protective layer instead of the separation layer. The protective layer may be disposed in contact with the transparent conductive layer to support the transparent conductive layer. The transparent conductive layer is formed on the substrate in the same manner as the separation layer, and is located between the substrate and the transparent conductive layer. The protective layer includes at least one of an organic insulating film and an inorganic insulating film, and these films can be formed by spin coating, sputtering, vapor deposition, or the like.
The touch sensor layer may be manufactured by the following method. A separation layer is formed on the substrate, and a protective layer is further formed on the separation layer as necessary. A transparent conductive layer patterned by photolithography is formed on the separation layer or the protective layer, and a peelable protective film is stacked on the transparent conductive layer to separate the substrate. A peelable protective film may be similarly laminated on the separation layer to obtain a touch sensor layer. The touch sensor layer may be further transferred to another resin film, and assembled in the flexible laminate together with the resin film. The touch sensor layer may be assembled in the flexible laminate without the resin film.
The thickness of the touch sensor layer is, for example, 5 to 100 μm, preferably 5 to 50 μm, more preferably 6 to 30 μm, and may be 6 to 15 μm. When the thickness of the touch sensor layer is 5 μm or more, the impact resistance of the flexible laminate can be improved, and when it is 100 μm or less, the flexibility of the flexible laminate can be improved.
[ polarizing plate ]
The polarizing plate 40 of the flexible laminate 100 is bonded to the touch sensor layer 30 in which the glass plate 20 is laminated entirely on the upper portion (fig. 1A), or bonded to the touch sensor layer 30 in which the glass plate 20 is laminated entirely on the lower portion (fig. 1B), or bonded to the window film 10 and the touch sensor layer 30 in which the glass plate 20 is laminated entirely on the upper portion (fig. 1C), or bonded to the window film 10 and the touch sensor layer 30 in which the glass plate 20 is laminated entirely on the lower portion (fig. 1D) via an adhesive layer.
The polarizing plate is preferably disposed as close to the window film 10 as possible. In other words, the polarizing plate is preferably disposed on the visible side (window film 10 side) with respect to the touch sensor layer. This makes the pattern of the touch sensor layer less visible, and improves the visibility of the resulting display device. From the above point of view, the embodiment shown in fig. 1C and 1D is preferable among the embodiments shown in fig. 1A to 1D.
The polarizer 40 may be a linear polarizer or a circular polarizer. Examples of the linearly polarizing plate include a film containing a stretched film or a stretched layer having a dichroic dye adsorbed thereon, and a polarizer obtained by coating and curing a composition containing a dichroic dye and a polymerizable compound. As the dichroic dye, specifically, iodine or a dichroic organic dye can be used. The dichroic organic dye includes a dichroic direct dye composed of a bisazo compound such as c.i. direct red 39, and a dichroic direct dye composed of a compound such as trisazo and tetraazo.
Examples of the film used as a polarizer, which is obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound, include a film containing a cured product of a polymerizable liquid crystal compound, such as a layer obtained by applying and curing a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a polymerizable liquid crystal. A film obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound is preferable because the direction of bending is not limited as compared with a stretched film or a stretched layer in which a dichroic dye is adsorbed.
The linearly polarizing plate may be constituted only by the polarizer, or may further include a resin film, a substrate, an alignment film, and a protective layer in addition to the polarizer. The thickness of the linearly polarizing plate is, for example, 1 to 100. Mu.m, preferably 5 to 75 μm, and more preferably 10 to 50 μm.
(1) Linear polarizer having stretched film or layer as polarizer
A description will be given of a linear polarizing plate having a stretched film with a dichroic dye adsorbed thereon as a polarizer. The stretched film having a dichroic dye adsorbed thereon as a polarizer can be generally produced through a step of uniaxially stretching a polyvinyl alcohol resin film, a step of dyeing the polyvinyl alcohol resin film with the dichroic dye to adsorb the dichroic dye, a step of treating the polyvinyl alcohol resin film having the dichroic dye adsorbed thereon with an aqueous boric acid solution, and a step of washing the polyvinyl alcohol resin film with water after the treatment with the aqueous boric acid solution. The polarizer may be used as it is as a linear polarizing plate, or a sheet obtained by laminating a resin film described later on one or both surfaces thereof may be used as a linear polarizing plate.
The thickness of the polarizer is, for example, 0.1 to 50 μm, preferably 0.5 to 25 μm, and more preferably 1 to 10 μm.
The polyvinyl alcohol resin is obtained by saponifying a polyvinyl acetate resin. As the polyvinyl acetate-based resin, in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith may be used. Examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth) acrylamides having an ammonium group.
The saponification degree of the polyvinyl alcohol resin is usually 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol resin may be modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The polymerization degree of the polyvinyl alcohol resin is usually 1000 to 10000, preferably 1500 to 5000.
Next, a description will be given of a linear polarizing plate having a stretched layer having a dichroic dye adsorbed thereon as a polarizer. The stretched layer having a dichroic dye adsorbed thereon as a polarizer can be usually produced through a step of applying a coating liquid containing the above-mentioned polyvinyl alcohol resin onto a base film, a step of uniaxially stretching the obtained laminated film, a step of producing a polarizer by dyeing the polyvinyl alcohol resin layer of the uniaxially stretched laminated film with a dichroic dye and allowing the layer to adsorb the dichroic dye, a step of treating the film having the dichroic dye adsorbed thereon with an aqueous boric acid solution, and a step of washing the film with water after the treatment with the aqueous boric acid solution. If necessary, the substrate film may be peeled off from the polarizer. The material and thickness of the base film may be the same as those of the resin film described later.
The polarizer as the stretched film or the stretched layer may be incorporated in the optical laminate in a form in which a resin film is bonded to one surface or both surfaces thereof. The resin film can function as a protective film or a retardation layer for polarizers. The resin film may be a thermoplastic resin film. The resin film may be made of polyolefin resins such as chain polyolefin resins (polypropylene resins, etc.) and cyclic polyolefin resins (norbornene resins, etc.); cellulose resins such as triacetyl cellulose; polyester resins such as polyethylene terephthalate, polyethylene naphthalate and polybutylene terephthalate; a polycarbonate-based resin; (meth) acrylic resins; or a mixture thereof.
The thickness of the resin film is usually 1 to 100. Mu.m, preferably 5 to 50 μm, and more preferably 10 to 25 μm, from the viewpoint of protecting the polarizer and improving the bendability. The resin film may or may not have a phase difference. The resin film may be bonded to the polarizer using an adhesive layer, for example.
(2) Linear polarizer having polarizer made of film obtained by applying and curing composition containing dichroic dye and polymerizable compound
A description will be given of a linear polarizing plate having a film as a polarizer, the film being obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound. Examples of the film used for the polarizer, which is obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound, include a film obtained by applying and curing a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a liquid crystal compound onto a substrate. The film may be used as a linear polarizer by peeling off or using together with a substrate, or may be used as a linear polarizer having a thermoplastic resin film on one or both surfaces thereof.
The substrate may be a resin film. Examples and thicknesses of the base material may be the same as those exemplified in the description of the resin film described above. The substrate may be a resin film having a hard coating layer, an anti-reflection layer or an antistatic layer on at least one surface. The substrate may have a hard coat layer, an antireflection layer, an antistatic layer, or the like formed only on the surface of the side where the polarizer is not formed. The substrate may have a hard coat layer, an antireflection layer, an antistatic layer, or the like formed only on the surface of the side on which the polarizer is formed.
Examples of the resin film include the same resin films as those of the above-described linear polarizing plates having a stretched film or a stretched layer as a polarizer.
An overcoat layer may also be formed on the polarizer. The overcoat layer is formed by applying an aqueous adhesive or an active energy ray-curable adhesive described later. The thickness of the overcoat is, for example, 0.1 to 10 μm, preferably 1 to 5 μm.
A film obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound is preferably thinner, but if too thin, the strength tends to be lowered, and the processability tends to be poor. The thickness of the film is, for example, 1 to 100. Mu.m, preferably 5 to 50 μm, and more preferably 10 to 25 μm.
Specific examples of the film obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound include films described in japanese patent application laid-open nos. 2013-37353 and 2013-33249.
The linear polarizer may be a circular polarizer having a phase difference layer. The circularly polarizing plate in which the polarizer and the retardation layer are arranged so that the absorption axis of the linearly polarizing plate and the slow axis of the retardation layer form a predetermined angle can exhibit an antireflection function. When the phase difference layer comprises a lambda/4 plate, the angle of the absorption axis of the linear polarizer to the slow axis of the lambda/4 plate may be 45 deg. + -10 deg.. The linearly polarizing plate and the retardation layer may be bonded to each other via an adhesive layer or an adhesive layer.
[ bonding/adhesive layer ]
In the flexible laminate 100, as described above, the adhesive layer bonds the window film 10, the glass plate 20, the touch sensor layer 30, and the polarizing plate 40 on the viewing side to each other. The adhesive layer may be used to attach the flexible laminate 100 to the lower structure 50 to form a display device (fig. 2).
The bonding/adhesive layer is an adhesive layer or an adhesive layer. The pressure-sensitive adhesive is an adhesive having pressure-sensitive adhesiveness.
When the bonding/pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer may be composed of a pressure-sensitive adhesive composition containing, as a main component, a resin such as a (meth) acrylic, rubber, urethane, ester, silicone, or polyvinyl ether resin. Among them, preferred is an adhesive composition containing a (meth) acrylic resin as a base polymer, which is excellent in transparency, weather resistance, heat resistance and the like. The adhesive composition may be active energy ray-curable or heat-curable.
As the (meth) acrylic resin (base polymer) used in the adhesive composition, for example, a polymer or copolymer in which 1 or 2 or more kinds of (meth) acrylic esters such as butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate are used as monomers is preferably used. The base polymer preferably copolymerizes polar monomers. Examples of the polar monomer include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, and the like, such as (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N-dimethylaminoethyl (meth) acrylate, and glycidyl (meth) acrylate.
The adhesive composition may be composed solely of the above-described base polymer, and typically further comprises a crosslinking agent. Examples of the crosslinking agent include metal ions having a valence of 2 or more and forming a metal carboxylate with a carboxyl group; a polyamine compound forming an amide bond with a carboxyl group; polyepoxy compounds or polyols which form ester bonds with carboxyl groups; and polyisocyanate compounds that form an amide bond with a carboxyl group. Among them, polyisocyanate compounds are preferable.
The active energy ray-curable adhesive composition has a property of being cured by irradiation with an active energy ray such as an ultraviolet ray or an electron beam, and can be adhered to an adherend such as a film with adhesiveness even before irradiation with an active energy ray. The adhesive force can be adjusted by curing by irradiation with active energy rays. The active energy ray-curable adhesive composition is preferably an ultraviolet-curable adhesive composition. As described above, the active energy ray-curable adhesive composition contains an active energy ray-polymerizable compound in addition to the base polymer and the crosslinking agent. A photopolymerization initiator, a photosensitizer and the like are also suitably contained.
The adhesive composition may further contain additives such as fine particles, beads (resin beads, glass beads, and the like), glass fibers, resins other than the base polymer, adhesion/tackiness imparting agents, fillers (metal powders, other inorganic powders, and the like), antioxidants, ultraviolet absorbers, dyes, pigments, colorants, antifoaming agents, anticorrosive agents, and photopolymerization initiators for imparting light scattering properties.
The adhesive layer can be formed by applying a diluted organic solvent solution of the adhesive composition to a substrate and drying the applied solution. When an active energy ray-curable pressure-sensitive adhesive composition is used, a cured product having a desired degree of curing can be produced by irradiating the pressure-sensitive adhesive layer formed with an active energy ray.
The thickness of the pressure-sensitive adhesive layer is, for example, 0.1 to 30 μm, preferably 0.5 to 20 μm, and more preferably 1 to 10 μm.
The storage elastic modulus of the pressure-sensitive adhesive layer is, for example, 0.001 to 1MPa, preferably 0.01 to 0.3MPa, and more preferably 0.05 to 0.1MPa at 25 ℃. When the storage elastic modulus is 0.001MPa or more, the impact resistance of the flexible laminate is easily improved, and when the storage elastic modulus is 1MPa or less, the flexibility of the flexible laminate is easily improved. The storage elastic modulus of the pressure-sensitive adhesive layer can be measured by the method described in the examples below.
When the adhesive/pressure-sensitive adhesive layer 20 is an adhesive layer, the adhesive layer may be formed of, for example, an aqueous adhesive or an active energy ray-curable adhesive.
Examples of the aqueous adhesive include an aqueous polyvinyl alcohol resin solution and an aqueous two-pack polyurethane emulsion adhesive composition, and the aqueous polyvinyl alcohol resin solution is preferred.
When the aqueous adhesive contains a polyvinyl alcohol resin, the content of the polyvinyl alcohol resin is preferably 1 to 10 parts by mass or less, and more preferably 1 to 5 parts by mass, based on 100 parts by mass of water.
The water-based adhesive may contain a polyaldehyde, a water-soluble epoxy compound, a melamine compound, a zirconium oxide compound, a zinc compound, and the like as additives.
In order to improve the adhesiveness, the aqueous adhesive preferably contains a curable component such as a metal salt of glyoxylic acid, glyoxal, and a water-soluble epoxy resin, and/or a crosslinking agent. The metal salt of glyoxylic acid is preferably an alkali metal salt or an alkaline earth metal salt, and examples thereof include sodium glyoxylate, potassium glyoxylate, magnesium glyoxylate, and calcium glyoxylate. As the water-soluble epoxy resin, for example, a polyamidopolyamine epoxy resin obtained by reacting epichlorohydrin with a polyamidoamine obtained by reacting polyalkylene polyamine such as diethylenetriamine, triethylenetetramine or the like with dicarboxylic acid such as adipic acid or the like can be preferably used.
The active energy ray-curable adhesive contains an active energy ray-curable compound. Examples of the active energy ray-curable compound include a cationically polymerizable compound and a radically polymerizable compound. When the cationic polymerizable compound or the radical polymerizable compound is contained, an effect of increasing the hardness of the adhesive layer can be expected.
Examples of the cationically polymerizable compound include an oxetane compound and an epoxy compound. The content of the cationic polymerizable compound is preferably 10 to 99 parts by mass, and more preferably 40 to 99 parts by mass, based on 100 parts by mass of the active energy ray-curable adhesive composition.
The active energy ray-curable adhesive may contain only 1 kind of oxetane compound, or may contain 2 or more kinds of oxetane compounds. The active energy ray-curable adhesive may contain only 1 epoxy compound, or may contain 2 or more epoxy compounds.
Examples of the radical polymerizable compound include a (meth) acrylic compound, a (meth) acrylamide compound, and the like.
Examples of the (meth) acrylic compound include a (meth) acrylate monomer having at least 1 (meth) acryloyloxy group in the molecule and a (meth) acrylate oligomer having at least 2 (meth) acryloyloxy groups in the molecule. These may be used alone or in combination of 2 or more.
Examples of the (meth) acrylamide compound include N-substituted (meth) acrylamide compounds. The N-substituted (meth) acrylamide compound is a (meth) acrylamide compound having a substituent at the N-position. A typical example of such a substituent is an alkyl group. The substituents at the N-position may be bonded to each other to form a ring, -CH constituting the ring 2 -may be substituted with oxygen atoms. Further, a substituent such as an alkyl group or an oxo group (= O) may be bonded to a carbon atom constituting the ring. N-substituted (meth) acrylamides can generally be produced by reacting (meth) acrylic acid or its chloride with a primary or secondary amine.
The content of the radical polymerizable compound is preferably 1 to 70 parts by mass, and more preferably 10 to 60 parts by mass, per 100 parts by mass of the active energy ray-curable adhesive.
The active energy ray-curable adhesive may contain only 1 kind of radical polymerizable compound, or may contain 2 or more kinds of radical polymerizable compounds.
The active energy ray-curable adhesive may further contain a cationic polymerization initiator or a radical polymerization initiator. The active energy ray-curable adhesive may contain only 1 polymerization initiator, or may contain 2 or more polymerization initiators.
[ Flexible laminate ]
The flexible laminate 100 can be manufactured by laminating the window film 10, the glass plate 20, the touch sensor layer 30, and the polarizing plate 40 so that the window film is positioned on the visible surface side and the glass plate is positioned on the upper or lower portion of the touch sensor layer 30. When these members are bonded, the above adhesive/pressure-sensitive adhesive layer may be used, or the bonding surface may be subjected to an easy adhesion treatment.
In one embodiment, first, the glass plate 20 and the touch sensor layer 30 are bonded via an adhesive layer to obtain a touch sensor layer to which the glass plate is bonded. The glass plate 20 may be located at an upper portion or a lower portion of the touch sensor layer 30. Next, the exposed surface of the window film 10 not covered with the hard coat layer or the like is bonded to the polarizing plate 40 via an adhesive layer. Thereafter, the exposed surface of the polarizing plate 40 and the touch sensor layer to which the glass plate is bonded are bonded via an adhesive layer. In this case, the bonding surface of the touch sensor layer to which the glass plate is bonded may be the glass plate side or the touch sensor layer side.
In another embodiment, the exposed surface of the window film 10 not covered with a hard coat layer or the like is bonded to the touch sensor layer to which the glass plate is bonded via an adhesive layer. In this case, the bonding surface of the touch sensor layer to which the glass plate is bonded may be the glass plate side or the touch sensor layer side. Next, the exposed surface of the touch sensor layer to which the glass plate is bonded to the polarizing plate 40 via an adhesive layer.
The flexible laminate can be used as a layer constituting the visible surface side of the display device. Specific examples of the display device include an organic EL display device.
[ display device ]
The flexible laminate 100 may manufacture the display device 200 by laminating a lower structure of the display device on the lower side. In this case, for example, the exposed surface of the flexible laminate 100 on the side not visible and the display surface of the lower structure may be bonded via the adhesive layer. Examples of the lower structure of the display device include a display structure including an organic EL layer, an organic EL panel, and the like.
The display device including the flexible laminate may have a bending resistance such that the window film does not crack or break when the operation of bending and stretching the window film with a bending radius of 3mm is repeated 10 ten thousand times, preferably 20 ten thousand times, with the window film located on the viewing side as the inner side. The specific method of the bending test was as described in examples below.
Examples
The present invention will be described in more detail below with reference to examples. The present invention is not limited to these examples. In the present example, the unit "part" of the ratio of the compounding materials is based on mass unless otherwise specified.
The following measurement methods were carried out as follows.
(a) Thickness of the layer
The thickness of each layer was measured using a contact type film thickness measuring apparatus ("MS-5C" (trade name) manufactured by Nikon corporation. The polarizer and the alignment film were measured using a laser microscope ("OLS 3000" (trade name) manufactured by olympus corporation).
(b) Storage modulus of elasticity (G')
The adhesive layer was laminated to 150 μm to make a sample. The storage elastic modulus (G') was measured using a rheometer ("MCR-301" (trade name) manufactured by Anton Parr corporation. The measurement conditions were a temperature of 25 ℃, a stress of 1% and a frequency of 1Hz.
< manufacturing example >
(production of Window film 10)
A window film 10 (thickness 50 μm) having a hard coat layer of 10 μm formed on one surface of a substrate film was produced by applying the following composition for a hard coat layer to one surface of a transparent substrate film (polyamideimide film, thickness 40 μm) produced according to example 4 of jp 2018-119141 a, drying the composition with a solvent, and curing the dried composition with ultraviolet rays. Composition for forming hard coat layer: the acrylic resin composition was prepared by mixing 30 parts of a multifunctional acrylate ("MIRAMER M340" (trade name) manufactured by MIWON specialty Chemical), 50 parts of a nano silica sol (particle size 12nm, solid content 40%) dispersed in propylene glycol monomethyl ether, 17 parts of ethyl acetate, 2.7 parts of a photopolymerization initiator ("I184" (trade name) manufactured by BASF), and 0.3 parts of a fluorine-based additive ("KY 1203" (trade name) manufactured by shin-Etsu Chemical Co., ltd.) with a mixer and filtering the mixture with a polypropylene (PP) filter.
(production of glass plate 20)
A glass plate (trade name, "AS87-eco" (product name) manufactured by SCHOTT Co., ltd., thickness: 100 μm) was subjected to etching treatment and then to chemical strengthening treatment to prepare a glass plate 20 (thickness: 50 μm).
(production of touch sensor layer 30)
A separation layer, a protective layer, and a transparent conductive layer are sequentially formed on a glass substrate. The transparent conductive layer is patterned by photolithography. The separation layer was a cured layer of an acrylic resin and had a thickness of 0.5. Mu.m. The protective layer was a cured layer of acrylic resin and had a thickness of 3 μm. The transparent conductive layer has an Indium Tin Oxide (ITO) layer, and the surface thereof is covered with an insulating layer. The thickness of the ITO layer was 0.1. Mu.m. The insulating layer was a cured product of the photosensitive resin composition described in example 3 of Japanese patent application laid-open No. 2016-14877, and had a thickness of 2 μm. The touch sensor layer 30 composed of the separation layer, the protective layer, and the transparent conductive layer was peeled off from the glass substrate to produce a flexible laminate.
(preparation of polarizing plate 40)
A photo-alignment film was formed on a triacetyl cellulose (TAC) film having a thickness of 25 μm. A composition containing a dichroic dye and a polymerizable liquid crystal compound was applied onto the photo-alignment film, and the photo-alignment film was aligned and cured to produce a polarizer having a thickness of 2 μm. An acrylic resin composition was further applied to the polarizer and cured by irradiation with ultraviolet light to form an overcoat layer having a thickness of 2 μm. A retardation layer comprising a layer obtained by polymerizing and curing a liquid crystal compound was bonded to the overcoat layer through an acrylic pressure-sensitive adhesive layer having a thickness of 5 μm. The layer of the retardation layer was constituted of a lambda/4 plate (thickness 2 μm) composed of a layer cured with a liquid crystal compound and an alignment film, an ultraviolet-curable adhesive layer (thickness 2 μm), and a positive C plate (thickness 3 μm) composed of a layer cured with a liquid crystal compound and an alignment film. The retardation layer was laminated with a λ/4 plate and a positive C plate in this order from the polarizer side. The slow axis of lambda/4 makes an angle of 45 DEG with the absorption axis of the polarizer. Thus, the polarizing plate 40 is produced. The polarizer 40 is a circular polarizer.
(preparation of adhesive layer)
The following components were reacted at 55 ℃ under nitrogen atmosphere with stirring to prepare an acrylic resin. Butyl acrylate: 70 parts, methyl acrylate: 20 parts, acrylic acid: 1.0 part, radical polymerization initiator (2,2' -azobisisobutyronitrile): 0.2 part, solvent (ethyl acetate): 80 parts of the raw materials. To the obtained acrylic resin were mixed 0.3 part of a crosslinking agent ("Coronate L" (trade name) manufactured by tokyo co., ltd.) and 0.5 part of a silane coupling agent ("X-12-981" (trade name) manufactured by shin-Etsu chemical industries, ltd.), and ethyl acetate was added so that the total solid content concentration became 10%, thereby preparing an adhesive composition. The obtained pressure-sensitive adhesive composition was applied by an applicator to the release-treated surface of a polyethylene terephthalate film (release film B, thickness: 38 μm) after release treatment so that the dried thickness was 25 μm. The coated layer was dried at 100 ℃ for 1 minute to obtain a film having an adhesive layer. Then, another polyethylene terephthalate film (release film A, thickness 38 μm) after the mold release treatment was laminated on the exposed surface of the pressure-sensitive adhesive layer. Then, the mixture was aged for 7 days under conditions of a temperature of 23 ℃ and a relative humidity of 50% RH. In this way, an adhesive layer composed of release film a, adhesive layer, and release film B was produced. The storage elastic modulus of the adhesive layer at 25 ℃ was 0.05MPa. The release film is appropriately peeled off when the flexible laminate is produced.
(production of substructure 50)
A colored polyimide film (thickness: 50 μm) was laminated on one surface of the colored polyimide film (product name: UPILEX-35S (trade name), thickness: 35 μm, manufactured by Utsu corporation) via the adhesive layer (thickness: 25 μm) to prepare a lower structure 50 (thickness: 110 μm) to be bonded to the flexible laminate 100. As a substitute for the lower structure of the display device.
< examples and comparative examples >
First, both surfaces of the glass plate 20 were subjected to corona treatment, and one of the surfaces was bonded to the touch sensor layer 30 and the glass plate via an ultraviolet-curable adhesive layer (NT-UV series, "NT-01UV" (trade name) of Nindon electric Co., ltd., thickness of 1.5 μm or less). The transparent substrate film surface of the window film 10, both surfaces of the polarizing plate 40, and both surfaces of the adhesive layer are subjected to corona treatment. Then, these are laminated and bonded via an adhesive layer in the order described below, thereby producing the flexible laminate 100.
< example 1 >
A flexible laminate 100 (fig. 1A) is produced by laminating a window film 10, a touch sensor layer 30 in which a glass plate 20 is laminated on the entire upper portion, and a polarizing plate 40 in this order from the viewing side.
< example 2 >
The flexible laminate 100 is produced by laminating the window film 10, the touch sensor layer 30 in which the glass plate 20 is laminated on the entire lower portion, and the polarizing plate 40 in this order from the viewing side (fig. 1B).
< example 3 >
The window film 10, the polarizing plate 40, and the touch sensor layer 30 in which the glass plate 20 is laminated on the entire upper portion are laminated in this order from the viewing side to produce a flexible laminate 100 (fig. 1C).
< example 4 >
The window film 10, the polarizing plate 40, and the touch sensor layer 30 in which the glass plate 20 is laminated on the entire lower portion are laminated in this order from the viewing side to produce a flexible laminate 100 (fig. 1D).
< comparative example 1 >
The window film 10, the polarizing plate 40, and the touch sensor layer 30 are stacked in this order from the viewing side to produce a laminate (not shown).
< comparative example 2 >
The glass plate 20, the polarizing plate 40, and the touch sensor layer 30 are laminated in this order from the viewing side to produce a laminate (not shown).
< impact resistance test >
The lower structure 50, pressure-sensitive paper (HS Grade, manufactured by Fuji Image Tech) and the flexible laminate produced in the examples or comparative examples were stacked in this order on a test bed to produce a laminate.
The pen was fixed at a height of 100mm from the test stand so that the pen tip faced downward, and the pen was dropped in a slightly large tube toward the visible side of the laminate so as not to tilt during the dropping. The results were evaluated according to the following criteria.
Very good: the pressure of the bottom surface is less than 72MPa,
good: the bottom pressure is 72MPa or more and less than 75MPa,
and (delta): the bottom pressure is 75MPa or more and less than 80MPa,
x: the bottom pressure is 80MPa or more.
< determination of the bottom pressure >
After the impact resistance test was completed, the pressure-sensitive paper (made by Fuji Image Tech, HS Grade) was scanned by a scanner (product name "V350" made by EPSON corporation) using a program (FPD-8010E). The pressure-sensitive paper for HS Grade has a pressure measurement range of 50MPa to 130MPa, and is suitable for measuring the impact pressure on a laminate (measurable range: 60 to 100 MPa). The values are based on the value identified as highest in the circular pressure range. After 1 day from the production of the laminate, the measurement was performed.
< bending test >
The lower pattern 50 and the flexible laminate were subjected to corona treatment (conditions: frequency 20Hz, output 8.6kW, and treatment speed 6.8 m/min), and then laminated with each other via an adhesive layer to prepare a laminate. The obtained laminate was subjected to a bending test. The bending test was conducted at room temperature under conditions of a bending radius of 3mm and an inner folding system. That is, the laminate thus obtained was set in a flat state (non-bent state) on a bending tester ("CFT-720C" (product name) manufactured by COVOTEC corporation, bent 180 degrees with the window film side being the inner side (inner folding type), and then returned to the original flat state, and the bending radius was 3mm.
The number of bending operations performed 1 time to bend and return to flat was counted as 1 bending time, and this operation was repeated. The bending speed was set to 1 second and 1 bending (60 rpm). The number of bending times when the glass sheet was cracked or broken in the region bent by the bending operation was recorded as a limit number of bending times, and evaluated according to the following criteria.
Very good: the limit bending times is more than 20 ten thousand,
good: the limit bending times are more than 10 ten thousand and less than 20 ten thousand,
and (delta): the limit bending times is more than 1 ten thousand and less than 10 ten thousand,
x: the limit bending times are less than 1 ten thousand.
< evaluation of visibility >
The surface of the laminate was observed, and the visibility of the laminate was evaluated by whether or not the pattern of the touch sensor layer 30 could be visually observed. The results are shown in Table 1.
Very good: the pattern of the touch sensor layer 30 cannot be seen by the naked eye,
good component: the pattern of the touch sensor layer 30 is slightly visible to the naked eye.
[ Table 1]
W is window film 10, G; glass plate 20, T touch sensor layer 30, P: polarizing plate 40
The above-mentioned components are bonded by an adhesive layer.
From table 1 it can be seen that: in the laminate using the flexible laminate 100 of the present invention, the pressure applied to the bottom surface of the lower pattern 50 is small, and the flexible laminate 100 exhibits an excellent impact relaxing effect (examples 1 to 4), the flexible laminate 100 has a window film, a polarizing plate, and a touch sensor layer on the visible side, and further has a glass plate having a thickness of 10 to 100 μm laminated on the touch sensor layer. In addition, this effect is greater in the embodiments in which the touch sensor layer 30 in which the glass plate 20 is laminated is disposed at the lower portion of the laminate (examples 3 and 4).
The laminate of the present invention is excellent in the results of the bending test and the visibility test in addition to the results of the impact resistance test. The flexible laminate of the present invention satisfies the performance requirements as a flexible laminate for a display device.
Description of the symbols
10 … window film,
20 … glass sheets,
30 … touch sensor layer,
a 40 … polarizer,
50 … lower structure,
100 … flexible laminate,
200 … is a display device.
Claims (6)
1. A flexible laminate comprising a window film, a polarizing plate and a touch sensor layer on the viewing side, and further comprising a glass plate having a thickness of 10 to 100 [ mu ] m laminated on the touch sensor layer.
2. The flexible laminate according to claim 1, wherein the window film, the touch sensor layer and the polarizing plate are provided on the visible side in this order.
3. The flexible laminate according to claim 1, wherein the window film, the polarizing plate and the touch sensor layer are provided on the visible side in this order.
4. The flexible laminate according to any one of claims 1 to 3, which is used for an organic EL display device.
5. An organic EL display device comprising an organic EL layer and the flexible laminate according to any one of claims 1 to 4 laminated on the viewing side of the organic EL layer.
6. The organic EL display device according to claim 5, wherein the glass sheet has a bending resistance such that when an operation of bending 180 ° with a bending radius of 3mm and stretching is repeated 10 ten thousand times with a window film located on a visible side as an inner side, the glass sheet does not crack or break.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-079576 | 2020-04-28 | ||
| JP2020079576 | 2020-04-28 | ||
| JP2021058365A JP2021176144A (en) | 2020-04-28 | 2021-03-30 | Flexible laminate and display device |
| JP2021-058365 | 2021-03-30 | ||
| PCT/JP2021/015398 WO2021220805A1 (en) | 2020-04-28 | 2021-04-14 | Flexible laminate and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115461704A true CN115461704A (en) | 2022-12-09 |
Family
ID=78300489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180030800.6A Pending CN115461704A (en) | 2020-04-28 | 2021-04-14 | Flexible laminate and display device |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2021176144A (en) |
| KR (1) | KR20230002313A (en) |
| CN (1) | CN115461704A (en) |
| TW (1) | TW202143478A (en) |
| WO (1) | WO2021220805A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103748065B (en) | 2011-08-31 | 2015-12-23 | 昭和电工株式会社 | The manufacture method of 2-alkenyl amine compound |
| KR101688173B1 (en) | 2011-12-26 | 2016-12-21 | 코오롱인더스트리 주식회사 | Plastic substrate |
| CN107765921B (en) * | 2017-10-31 | 2021-06-11 | 云谷（固安）科技有限公司 | Flexible substrate and manufacturing method thereof |
| JP7312528B2 (en) * | 2018-02-16 | 2023-07-21 | 東洋インキＳｃホールディングス株式会社 | Touch panel device and touch panel |
-
2021
- 2021-03-30 JP JP2021058365A patent/JP2021176144A/en active Pending
- 2021-04-14 KR KR1020227031705A patent/KR20230002313A/en unknown
- 2021-04-14 WO PCT/JP2021/015398 patent/WO2021220805A1/en active Application Filing
- 2021-04-14 CN CN202180030800.6A patent/CN115461704A/en active Pending
- 2021-04-21 TW TW110114398A patent/TW202143478A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JP2021176144A (en) | 2021-11-04 |
| KR20230002313A (en) | 2023-01-05 |
| TW202143478A (en) | 2021-11-16 |
| WO2021220805A1 (en) | 2021-11-04 |
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