CN115485651A - Flexible laminate and display device - Google Patents
Flexible laminate and display device Download PDFInfo
- Publication number
- CN115485651A CN115485651A CN202180030819.0A CN202180030819A CN115485651A CN 115485651 A CN115485651 A CN 115485651A CN 202180030819 A CN202180030819 A CN 202180030819A CN 115485651 A CN115485651 A CN 115485651A
- Authority
- CN
- China
- Prior art keywords
- layer
- glass plate
- film
- touch sensor
- flexible laminate
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
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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
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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
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- 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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- 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
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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
- B32B17/10165—Functional features of the laminated safety glass or glazing
- B32B17/10431—Specific parts for the modulation of light incorporated into the laminated safety glass or glazing
- B32B17/1044—Invariable transmission
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- 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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- 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
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- 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
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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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
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
- B32B2457/206—Organic displays, e.g. OLED
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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
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
- B32B2457/208—Touch screens
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- General Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
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- Polarising Elements (AREA)
- Laminated Bodies (AREA)
- Electroluminescent Light Sources (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The purpose of the present invention is to improve the impact relaxation property of a lower structure connected to a laminate such as an organic EL layer and to improve the scratch resistance of the laminate surface while maintaining flexibility (flexibility). The invention provides a flexible laminate, which comprises a 1 st glass plate with the thickness of 10-100 mu m, a polaroid, a touch sensor layer and a 2 nd glass plate with the thickness of 10-100 mu m laminated on the upper part or the lower part of 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 and scratch 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, the surface is sometimes tapped and sometimes rubbed.
Organic EL displays are generally thin. Therefore, there is a possibility that breakage may occur in the case of knocking, and in the case of rubbing, not only the surface may be scratched to deteriorate visibility, but also fine cracks may progress to breakage. The above display device is required to have a property of being able to withstand a sharp force applied from the viewing side in the vertical direction and friction against a surface while maintaining flexibility (flexibility).
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 having a film thickness of 35 μm or less laminated on the touch panel side of the polarizer, 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 only configured by sandwiching a thin 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 has insufficient impact mitigating effect on a display panel located at the lower portion of the laminate and has not improved scratch resistance.
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 scratch resistance is still insufficient, and the impact-mitigating effect on the lower portion of the laminate cannot be sufficiently obtained.
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 while maintaining flexibility (flexibility) and can improve scratch resistance on the laminate surface.
The invention provides a flexible laminate, which comprises a 1 st glass plate with the thickness of 10-100 mu m, a polaroid, a touch sensor layer and a 2 nd glass plate with the thickness of 10-100 mu m laminated on the upper part or the lower part of the touch sensor layer.
In one embodiment, the flexible laminate has a thickness of 200 to 500 μm.
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 the following bending resistance: when the 1 st glass plate was turned inside with the polarizing plate as a reference and the operation of bending 180 ° with a bending radius of 3mm and developing was repeated 10 ten thousand times, the 1 st glass plate did not crack or break.
According to the present invention, there is provided a flexible laminate which has improved impact relaxation effect on a lower structure connected to the laminate and improved scratch resistance on the laminate surface while maintaining flexibility (flexibility).
Drawings
Fig. 1A is a cross-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. 2 is a sectional view showing an example of the structure of the flexible laminate of the present invention further having a lower structure (only the flexible laminate of fig. 1C 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: the touch sensor layer 30 includes a 1 st glass plate 10 laminated on the entire visible side, a polarizing plate 20, and a 2 nd glass plate 40 laminated on at least one of the entire upper portion and the entire lower portion.
The flexible laminate 100 shown in fig. 1A includes, in order: the touch sensor layer includes a 1 st glass plate 10 laminated on the entire visible side, a polarizing plate 20, and a touch sensor layer 30 laminated on the entire lower portion of a 2 nd glass plate 40.
The flexible laminate 100 shown in fig. 1B has, in order: the touch sensor layer includes a 1 st glass plate 10 laminated on the entire visible side, a polarizing plate 20, and a touch sensor layer 30 laminated on the entire upper portion with a 2 nd glass plate 40.
The flexible laminate 100 shown in fig. 1C includes, in order: a 1 st glass plate 10 laminated on the entire visible side, a polarizing plate 20, and a touch sensor layer 30 in which a 2 nd glass plate 40 is laminated on the entire upper and entire lower portions.
The 1 st glass plate 10, the polarizing plate 20, the touch sensor layer 30, and the 2 nd glass 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 adhesive layer and the adhesive layer are not shown for simplicity.
As shown in fig. 2, the flexible laminate 100 of fig. 1A to 1C is further connected to the lower structure 50 via an adhesive layer (not shown).
[ glass plate ]
The 1 st glass plate 10 of the flexible laminate 100 is laminated over the entire visible side (fig. 1). The 2 nd glass plate 40 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 (fig. 1). Here, the entirety means a substantially entire surface covering the bending portion and the touch function region of the touch sensor layer 30. The 1 st glass plate 10 and the 2 nd glass plate 40 may be formed of the same material or may be formed of different materials. The glass plate used is preferably chemically strengthened glass having excellent strength and light transmittance, and the use of chemically strengthened glass can improve the impact resistance and scratch resistance of the laminate while maintaining flexibility (flexibility).
The 2 nd glass sheet 40 is preferably laminated as close as possible to the lower structure 50. In addition, it is preferable that the number of glass sheets to be laminated is as large as possible. This improves the impact resistance to the substructure. From the above viewpoint, in the embodiment shown in fig. 1A to 1C, the laminate shown in fig. 1A and 1C is preferable, and the laminate shown in fig. 1C is more preferable.
Chemically strengthened glass suitable for the above glass sheet can be obtained by chemical ion exchange treatment of glass. By replacing part of sodium ions and lithium ions on the glass surface with potassium ions having a larger ion 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, for example, 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 use a gas containing fluorine-containing inert gas, such as CF 4 、C 3 F 8 、C 2 F 6 、XeF 2 He gas or Ar gas of at least 1 kind of the above gases is used as the etching 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 15 to 90 μm, and more preferably 20 to 80 μm. When the thickness of the glass plate is 10 μm or more, the impact resistance of the flexible laminate can be improved, and the glass plate is less likely to be broken. When the thickness of the glass plate is 100 μm or less, the flexibility (flexibility) of the flexible laminate can be improved.
Functional layers such as a fingerprint resistant layer and a hard coat layer may be formed on the surface of the glass plate. The functional layer may be formed of an organic material such as an acrylic resin, a silicone resin, a polyester resin, a polyurethane resin, an amide resin, or an epoxy resin, or an inorganic material such as a metal. The thickness of the functional layer may be 0.01 to 10 μm.
[ polarizing plate ]
The polarizing plate 20 of the flexible laminate 100 is bonded to the 1 st glass plate 10 and the touch sensor layer 30 in which the 2 nd glass plate 40 is laminated on the entire lower portion thereof (fig. 1A), or bonded to the 1 st glass plate 10 and the touch sensor layer 30 in which the 2 nd glass plate 40 is laminated on the entire upper portion thereof (fig. 1B), or bonded to the 1 st glass plate 10 and the touch sensor layer 30 in which the 2 nd glass plate 40 is laminated on the entire upper portion thereof and the entire lower portion thereof (fig. 1C) via an adhesive layer.
The polarizing plate may be a linear polarizing plate or a circular polarizing plate. 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 (DIRECT RED) 39, and a dichroic direct dye composed of a compound such as trisazo or tetrazo.
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 liquid crystal dichroic dye 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 bending direction is not limited as compared with a stretched film or a stretched layer having a dichroic dye adsorbed thereon.
The linearly polarizing plate may be composed of only a 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 dyeing the polyvinyl alcohol resin layer of the uniaxially stretched laminated film with a dichroic dye to adsorb the dichroic dye to produce a polarizer, a step of treating the film having the dichroic dye adsorbed thereon with an aqueous boric acid solution, and a step of washing with water after the treatment with the aqueous boric acid solution. The substrate film may be peeled off from the polarizer as necessary. 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 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 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 obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound as a polarizer. 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 the substrate or together with the substrate, or may be used as a linear polarizer having a resin film on one surface 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 be formed with a hard coat layer, an antireflection layer, an antistatic layer, etc. 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. The resin film can be bonded to the polarizer using, for example, an adhesive or an adhesive.
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 it is 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 further having a phase difference layer. The phase difference layer may have at least 1 selected from a λ/4 plate, a λ/2 plate, or a positive C plate. A circularly polarizing plate in which a polarizer and a 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 be incorporated in a display device to exhibit an antireflection function or the like. When the phase difference layer has a λ/4 plate, the angle formed by the absorption axis of the linear polarizer and the slow axis of the λ/4 plate may be 45 ° ± 10 °. The linearly polarizing plate and the retardation layer may be bonded to each other via an adhesive layer or an adhesive layer. The retardation layer may be formed of the resin film or a layer obtained by curing a polymerizable liquid crystal compound. The thickness of the retardation layer may be, for example, 1 to 20 μm, or 1 to 10 μm.
[ touch sensor layer ]
The touch sensor layer 30 of the flexible laminate 100 is laminated with the 2 nd glass plate 40 (fig. 1) on at least one of the entire upper portion and the entire lower portion. The 2 nd glass plate 40 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 2 nd glass plate 40 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 the polarizing plate 20 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 surface, and may be appropriately selected from, for example, a capacitance method, a resistive film method, an optical sensor method, an ultrasonic 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 thin film formation.
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 is touched, the transparent conductive layer is grounded at the touched point via the 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 formed of 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 a substrate, and separated from the substrate together with the transparent conductive layer.
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 over the base material, and a protective layer is further formed over 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 the thickness is 100 μm or less, the flexibility of the flexible laminate can be improved.
[ bonding/adhesive layer ]
In the flexible laminate 100, as described above, the adhesive layer bonds the 1 st glass plate 10 laminated on the viewing side, the polarizing plate 20, and the touch sensor layer 30 having the 2 nd glass plate 40 laminated on at least one of the entire upper portion and the entire lower portion to each other. The adhesive layer may also be used to attach the flexible laminate 100 to the lower structure 50 to form the display device 200 (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 adhesive/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 an active energy ray-curable type or a thermosetting type.
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; polyisocyanate compounds which form an amide bond with a carboxyl group, and the like. 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 and tackiness 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, etc.), glass fibers for imparting light scattering properties, resins other than the base polymer, adhesion/tackiness imparting agents, fillers (metal powder, other inorganic powder, etc.), antioxidants, ultraviolet absorbers, dyes, pigments, colorants, antifoaming agents, anticorrosive agents, photopolymerization initiators, and the like.
The adhesive layer can be formed by applying a diluted solution of the adhesive composition in an organic solvent 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 bendability 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 examples described later.
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, and more preferably 1 to 5 parts by mass or less, per 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 at least one of a curable component such as a metal salt of glyoxylic acid, glyoxal, a water-soluble epoxy resin, 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 polyamide polyamine epoxy resin obtained by reacting epichlorohydrin with a polyamide amine obtained by reacting a polyalkylene polyamine such as diethylenetriamine or triethylenetetramine with a dicarboxylic acid such as adipic acid 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 (meth) acrylic acid compounds and (meth) acrylamide compounds.
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 can be used alone, can also be used in combination of 2 or more.
Examples of the (meth) acrylamide compound include an N-substituted (meth) acrylamide compound. 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 1 st glass plate 10, the polarizing plate 20, the touch sensor layer 30, and the 2 nd glass plate 40 such that the 1 st glass plate 10 is laminated on the visible side and the 2 nd glass plate 40 is laminated on at least one of the entire upper portion and the entire 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 2 nd glass plate 40 and the touch sensor layer 30 are bonded to both surfaces of the touch sensor layer 30 via an ultraviolet curable adhesive layer. Next, the 1 st glass plate 10, the polarizing plate 20, and the touch sensor layer to which the glass plate is bonded are sequentially bonded via an adhesive layer.
In another embodiment, first, the 2 nd glass plate 40 and the touch sensor layer 30 are bonded to one surface of the touch sensor layer 30 via an adhesive layer. Next, the 1 st glass plate 10, the polarizing plate 20, and the touch sensor layer to which the glass plates are bonded are sequentially 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.
The thickness of the flexible laminate is, for example, 200 to 500. Mu.m. When the thickness of the flexible laminate is 200 μm or more, the impact resistance of the flexible laminate can be improved, and when it is 500 μm or less, the flexibility of the flexible laminate can be improved. The thickness of the flexible laminate is preferably 250 to 450 μm, more preferably 300 to 400 μm.
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 on the non-viewing side of the flexible laminate 100 and the display surface of the lower structure may be bonded to each other via the adhesive layer. Examples of the lower structure of the display device include a display structure including an organic EL layer (organic electroluminescent layer), an organic TFT layer (organic thin film transistor layer), a liquid crystal layer, and the like.
The display device including the flexible laminate may have a bending resistance such that when the operation of bending the 1 st glass plate located on the visible side by 180 ° with a bending radius of 3mm and developing is repeated 10 ten thousand times, preferably 20 ten thousand times, the glass plate does not crack or break. 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 No. 1 glass plate 10 and No. 2 glass plate 40)
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, thereby producing a 1 st glass plate 10 and a 2 nd glass plate 40 (thickness: 50 μm).
(preparation of polarizing plate 20)
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 20 was produced. The polarizer 20 is a circular polarizer.
(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 μm. 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 of the transparent conductive layer is covered by 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 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 Tosoh corporation) and 0.5 part of a silane coupling agent ("X-12-981" (trade name) manufactured by shin-Etsu chemical Co., ltd.), and ethyl acetate was added so that the total solid content concentration became 10%, to obtain a pressure-sensitive 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 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, a pressure-sensitive adhesive layer composed of release film a, pressure-sensitive 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 suitably peeled in the production of a flexible laminate or the like.
(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.
(preparation of Window film)
A window film (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 solvent, and curing the dried film 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.
< examples and comparative examples >
First, both surfaces of the 2 nd glass plate 40 were subjected to corona treatment (conditions: frequency 20Hz, output 8.6kW, treatment speed 6.8 m/min), and one of the surfaces was bonded to the touch sensor layer 30 via an ultraviolet-curable adhesive layer (NT-01 UV (trade name) made by Nindon electric Co., ltd., thickness 1.5 μm). Next, both surfaces of the polarizing plate 20, the polyamide imide film side surface of the window film, and both surfaces of the adhesive layer were subjected to corona treatment in the same manner (conditions: frequency 20Hz, output 8.6kW, treatment speed 6.8 m/min). 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) was produced by laminating a 1 st glass plate 10, a polarizing plate 20, and a touch sensor layer 30 in which a 2 nd glass plate 40 was laminated on the entire lower portion in this order from the viewing side.
< example 2 >
The flexible laminate 100 is produced by laminating the 1 st glass plate 10, the polarizing plate 20, and the touch sensor layer 30, on which the 2 nd glass plate 40 is laminated, in this order from the viewing side (fig. 1B).
< example 3 >
The flexible laminate 100 is produced by laminating the 1 st glass plate 10, the polarizing plate 20, and the touch sensor layer 30 in which the 2 nd glass plate 40 is laminated over the entire upper portion and the entire lower portion in this order from the viewing side (fig. 1C).
< comparative example 1 >
A laminated body (not shown) was produced by laminating a window film instead of the 1 st glass plate 10 on the visible surface, the polarizing plate 20, and the touch sensor layer 30 in this order.
< comparative example 2 >
The 1 st glass plate 10, the polarizing plate 20, 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 stacked body so as not to be inclined during dropping. The results were evaluated according to the following criteria.
Very good: the pressure of the bottom surface of the lower structure 50 is less than 72MPa,
good: the pressure of the bottom surface of the lower structure (50) is 72MPa or more and less than 75MPa,
and (delta): the pressure of the bottom surface of the lower structure 50 is 75MPa or more and less than 80MPa,
x: the pressure of the bottom surface of the lower structure 50 is 80MPa or more.
< measurement of bottom surface 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 numerical values are based on the value identified as the highest in the circular pressure range. After 1 day from the production of the laminate, the measurement was performed.
< measurement of surface hardness >
The pencil hardness of the surface of the flexible laminates of examples and comparative examples was measured. The pencil hardness tester used was "PHT" (trade name) manufactured by SUKBO SCIENCE, inc. of Sooka scientific, korea. The test was carried out at a temperature of 25 ℃ in accordance with JIS K5600-5-4. The pencil angle is 90 deg. and the load is 1kg.
< 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, thereby producing 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. The obtained laminate was set in a flat state (in an unbent state) in a bending tester ("CFT-720C" (product name) manufactured by Covotech corporation), bent 180 ° so that the 1 st glass plate or the window film side laminated on the entire visible side was inward (in-fold method), and then returned to the original flat state. The bending radius was 3mm.
The number of bending operations performed 1 time to bend and return to flat was counted as 1 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 1 st glass plate or the window film laminated on the entire visible side in the region bent by the bending operation was cracked or broken was recorded as a limit number of bending times, and evaluated according to the following criteria. The results are shown in Table 1.
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.
[ Table 1]
G: 1 st glass plate 10, G': glass plate 2, 40, P: polarizing plate 20, T: touch sensor layer 30, W: window film
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 according to the present invention, the pressure applied to the bottom surface of the lower structure 50 is small, and the flexible laminate 100 exhibits an excellent impact relaxation effect (examples 1 to 3), the flexible laminate 100 includes a 1 st glass plate, a polarizing plate, a touch sensor layer, and a 2 nd glass plate having a thickness of 10 to 100 μm, which is laminated on at least one of the entire upper portion and the entire lower portion of the touch sensor layer. In addition, this effect is greater in the embodiment in which the 2 nd glass plate is laminated on the entire upper and entire lower portions of the touch sensor layer (example 3). By using the 1 st glass plate 10 on the visible surface of the laminate, the surface hardness is also improved.
The flexible laminate of the present invention is excellent in the results of the bending test as well as the results of the impact resistance test and the pencil hardness 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 … glass sheet 1,
a 20 … polarizer,
30 … touch sensor layer,
40 … a 2 nd glass sheet,
50 … lower structure,
100 … flexible laminate,
200 … is a display device.
Claims (5)
1. A flexible laminate comprises a 1 st glass plate having a thickness of 10 to 100 [ mu ] m, a polarizing plate, a touch sensor layer, and a 2 nd glass plate having a thickness of 10 to 100 [ mu ] m and laminated on the upper or lower part of the touch sensor layer.
2. The flexible laminate of claim 1, wherein the thickness is from 200 to 500 μm.
3. The flexible laminate according to claim 1 or 2, which is used for an organic EL display device.
4. An organic EL display device comprising an organic EL layer and the flexible laminate according to any one of claims 1 to 3 laminated on the visible side of the organic EL layer.
5. The organic EL display device according to claim 4, having the following bending resistance: when the 1 st glass plate was turned inside with the polarizing plate as a reference and the operation of bending 180 ° with a bending radius of 3mm and developing was repeated 10 ten thousand times, the 1 st glass plate did not crack or break.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-079577 | 2020-04-28 | ||
| JP2020079577 | 2020-04-28 | ||
| JP2021058368A JP2021176145A (en) | 2020-04-28 | 2021-03-30 | Flexible laminate and display device |
| JP2021-058368 | 2021-03-30 | ||
| PCT/JP2021/015399 WO2021220806A1 (en) | 2020-04-28 | 2021-04-14 | Flexible laminate and display device |
Publications (1)
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| CN115485651A true CN115485651A (en) | 2022-12-16 |
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| CN202180030819.0A Pending CN115485651A (en) | 2020-04-28 | 2021-04-14 | Flexible laminate and display device |
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| Country | Link |
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| JP (1) | JP2021176145A (en) |
| KR (1) | KR20230002314A (en) |
| CN (1) | CN115485651A (en) |
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| WO (1) | WO2021220806A1 (en) |
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| 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 |
| WO2015132694A1 (en) * | 2014-03-07 | 2015-09-11 | Semiconductor Energy Laboratory Co., Ltd. | Touch sensor, touch panel, and manufacturing method of touch panel |
| CN107765921B (en) * | 2017-10-31 | 2021-06-11 | 云谷（固安）科技有限公司 | Flexible substrate and manufacturing method thereof |
| CN107633775A (en) * | 2017-10-31 | 2018-01-26 | 云谷（固安）科技有限公司 | Flexible Displays module and preparation method thereof |
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2021
- 2021-03-30 JP JP2021058368A patent/JP2021176145A/en active Pending
- 2021-04-14 WO PCT/JP2021/015399 patent/WO2021220806A1/en active Application Filing
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| WO2021220806A1 (en) | 2021-11-04 |
| JP2021176145A (en) | 2021-11-04 |
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