CN111458782A - Flexible laminate and image display device provided with same - Google Patents
Flexible laminate and image display device provided with same Download PDFInfo
- Publication number
- CN111458782A CN111458782A CN201911356175.5A CN201911356175A CN111458782A CN 111458782 A CN111458782 A CN 111458782A CN 201911356175 A CN201911356175 A CN 201911356175A CN 111458782 A CN111458782 A CN 111458782A
- Authority
- CN
- China
- Prior art keywords
- thickness
- flexible laminate
- adhesive layer
- layer
- front panel
- 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
Links
- 239000012790 adhesive layer Substances 0.000 claims abstract description 80
- 229920005989 resin Polymers 0.000 claims description 56
- 239000011347 resin Substances 0.000 claims description 56
- 238000005452 bending Methods 0.000 claims description 40
- 238000012360 testing method Methods 0.000 claims description 25
- 238000003860 storage Methods 0.000 claims description 18
- 239000011247 coating layer Substances 0.000 claims 2
- 239000010410 layer Substances 0.000 description 142
- 239000000203 mixture Substances 0.000 description 44
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 33
- 239000000853 adhesive Substances 0.000 description 29
- 230000001070 adhesive effect Effects 0.000 description 29
- 239000004372 Polyvinyl alcohol Substances 0.000 description 25
- 229920002451 polyvinyl alcohol Polymers 0.000 description 25
- 239000000975 dye Substances 0.000 description 24
- -1 polyethylene Polymers 0.000 description 20
- 239000000758 substrate Substances 0.000 description 14
- 238000010521 absorption reaction Methods 0.000 description 13
- 150000001875 compounds Chemical class 0.000 description 12
- 239000004973 liquid crystal related substance Substances 0.000 description 11
- 239000004925 Acrylic resin Substances 0.000 description 10
- 229920000178 Acrylic resin Polymers 0.000 description 10
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 9
- 239000004327 boric acid Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000004043 dyeing Methods 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 7
- 239000011521 glass Substances 0.000 description 7
- 230000001681 protective effect Effects 0.000 description 7
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 6
- 238000010306 acid treatment Methods 0.000 description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 6
- 229920005601 base polymer Polymers 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 229910052740 iodine Inorganic materials 0.000 description 6
- 239000011630 iodine Substances 0.000 description 6
- 239000000178 monomer Substances 0.000 description 6
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 5
- 238000003851 corona treatment Methods 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 229920001721 polyimide Polymers 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 239000004642 Polyimide Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000003431 cross linking reagent Substances 0.000 description 4
- 238000010030 laminating Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 229920002284 Cellulose triacetate Polymers 0.000 description 3
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 3
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000000412 dendrimer Substances 0.000 description 3
- 229920000736 dendritic polymer Polymers 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 229920002647 polyamide Polymers 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 229920001225 polyester resin Polymers 0.000 description 3
- 239000004645 polyester resin Substances 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 239000011118 polyvinyl acetate Substances 0.000 description 3
- 229920002689 polyvinyl acetate Polymers 0.000 description 3
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- 239000004962 Polyamide-imide Substances 0.000 description 2
- 239000004695 Polyether sulfone Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 2
- 150000001241 acetals Chemical class 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000000982 direct dye Substances 0.000 description 2
- 238000005401 electroluminescence Methods 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000012044 organic layer Substances 0.000 description 2
- TZMFJUDUGYTVRY-UHFFFAOYSA-N pentane-2,3-dione Chemical group CCC(=O)C(C)=O TZMFJUDUGYTVRY-UHFFFAOYSA-N 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 2
- 229920002312 polyamide-imide Polymers 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 229920006393 polyether sulfone Polymers 0.000 description 2
- 239000011112 polyethylene naphthalate Substances 0.000 description 2
- 229920001228 polyisocyanate Polymers 0.000 description 2
- 239000005056 polyisocyanate Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007127 saponification reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- FERIUCNNQQJTOY-UHFFFAOYSA-M Butyrate Chemical compound CCCC([O-])=O FERIUCNNQQJTOY-UHFFFAOYSA-M 0.000 description 1
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Natural products CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 1
- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 1
- 239000004697 Polyetherimide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical class C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- SMEGJBVQLJJKKX-HOTMZDKISA-N [(2R,3S,4S,5R,6R)-5-acetyloxy-3,4,6-trihydroxyoxan-2-yl]methyl acetate Chemical compound CC(=O)OC[C@@H]1[C@H]([C@@H]([C@H]([C@@H](O1)O)OC(=O)C)O)O SMEGJBVQLJJKKX-HOTMZDKISA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 229940081735 acetylcellulose Drugs 0.000 description 1
- 150000003926 acrylamides Chemical class 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000004063 butyryl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 239000012461 cellulose resin Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 150000001925 cycloalkenes Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229920005994 diacetyl cellulose Polymers 0.000 description 1
- SLZCDQVDTBWJND-UHFFFAOYSA-L disodium 8-[[4-[4-[(4-ethoxyphenyl)diazenyl]-3-methylphenyl]-2-methylphenyl]diazenyl]-7-hydroxynaphthalene-1,3-disulfonate Chemical compound CCOC1=CC=C(C=C1)N=NC2=C(C=C(C=C2)C3=CC(=C(C=C3)N=NC4=C(C=CC5=CC(=CC(=C54)S(=O)(=O)O)S(=O)(=O)[O-])[O-])C)C.[Na+].[Na+] SLZCDQVDTBWJND-UHFFFAOYSA-L 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- ZHNUHDYFZUAESO-UHFFFAOYSA-N formamide Substances NC=O ZHNUHDYFZUAESO-UHFFFAOYSA-N 0.000 description 1
- 125000002485 formyl group Chemical group [H]C(*)=O 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229940077844 iodine / potassium iodide Drugs 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000003504 photosensitizing agent Substances 0.000 description 1
- 229920001643 poly(ether ketone) Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920001601 polyetherimide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 229920000306 polymethylpentene Polymers 0.000 description 1
- 239000011116 polymethylpentene Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920001289 polyvinyl ether Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 125000001501 propionyl group Chemical group O=C([*])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000012508 resin bead Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 238000010897 surface acoustic wave method Methods 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04102—Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Optics & Photonics (AREA)
- Polarising Elements (AREA)
- Electroluminescent Light Sources (AREA)
- Laminated Bodies (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Liquid Crystal (AREA)
- Surface Treatment Of Optical Elements (AREA)
Abstract
The flexible laminate comprises a front panel, a 1 st adhesive layer, a circularly polarizing plate, a 2 nd adhesive layer, and a touch sensor panel in this order, wherein the relation of { Ea × (a + b) }/(a + b + c + d + e) ≧ 1.5(i) is satisfied when the thickness of the front panel is a [ mu ] m, the thickness of the 1 st adhesive layer is b [ mu ] m, the thickness of the circularly polarizing plate is c [ mu ] m, the thickness of the 2 nd adhesive layer is d [ mu ] m, and the thickness of the touch sensor panel is e [ mu ] m, and the tensile elastic modulus of the front panel at a temperature of 23 ℃ and a relative humidity of 55% is Ea [ GPa ].
Description
Technical Field
The present invention relates to a flexible laminate and an image display device provided with the flexible laminate.
Background
In the field of various image display devices such as liquid crystal display devices and organic electroluminescence (E L) display devices, flexible displays are known in which a display panel can be bent or the like by using a flexible substrate (for example, patent documents 1 and 2).
Documents of the prior art
Patent document
Patent document 1: korean laid-open patent No. 10-2016-
Patent document 2: korean laid-open patent No. 10-2017-0093610
Disclosure of Invention
Although a flexible substrate is excellent in flexibility, it tends to have inferior impact resistance compared with glass used in conventional image display devices. On the other hand, if the impact resistance of a flexible substrate is to be improved, the flexibility tends to be lowered.
The purpose of the present invention is to provide a flexible laminate having impact resistance and excellent bendability, and an image display device provided with the flexible laminate.
The invention provides the following flexible laminate and image display device.
[ 1 ] A flexible laminate comprising a front panel, a 1 st adhesive layer, a circularly polarizing plate, a 2 nd adhesive layer, and a touch sensor panel in this order,
when the thickness of the front panel is a [ mu ] m, the thickness of the 1 st adhesive layer is b [ mu ] m, the thickness of the circularly polarizing plate is c [ mu ] m, the thickness of the 2 nd adhesive layer is d [ mu ] m, the thickness of the touch sensor panel is e [ mu ] m, and the tensile modulus of the front panel at a temperature of 23 ℃ and a relative humidity of 55% is Ea [ GPa ], the following relation of formula (i) is satisfied:
{Ea×(a+b)}/(a+b+c+d+e)≥1.5 (i)。
[ 2 ] the flexible laminate according to [ 1 ], wherein the tensile elastic modulus Ea [ GPa ] of the front panel, the thickness b of the 1 st adhesive layer and the thickness d of the 2 nd adhesive layer satisfy the following formula (ii):
b/(Ea×d)≥0.3 (ii)。
[ 3 ] the flexible laminate according to [ 1 ] or [ 2 ], wherein the front sheet has a rigidity of 0.09GPa mm to 0.7GPa mm at a temperature of 23 ℃ and a relative humidity of 55%,
the rigidity of the circularly polarizing plate at a temperature of 23 ℃ and a relative humidity of 55% is 40 MPa.mm-400 MPa.mm,
the rigidity of the touch sensor panel at a temperature of 23 ℃ and a relative humidity of 55% is 15 MPa.mm to 700 MPa.mm.
The flexible laminate according to any one of [ 1 ] to [ 3 ], wherein the 1 st adhesive layer has a storage modulus of elasticity of 0.01MPa to 0.15MPa at a temperature of 25 ℃ and a relative humidity of 50%,
the 2 nd adhesive layer has a storage elastic modulus of 0.01MPa to 0.15MPa at a temperature of 25 ℃ and a relative humidity of 50%.
[ 5 ] the flexible laminate according to any one of [ 1 ] to [ 4 ], wherein when a total thickness t [ μm ] of the thickness a of the front sheet, the thickness b of the 1 st pressure-sensitive adhesive layer, the thickness c of the circularly polarizing plate, the thickness d of the 2 nd pressure-sensitive adhesive layer, and the thickness e of the touch sensor panel is represented by the following formula (iii),
t＝a+b+c+d+e (iii)
t is 250 μm or less.
The flexible laminate according to any one of [ 1 ] to [ 5 ], wherein the front sheet is a resin film or a resin film with a hard coat layer having a hard coat layer on at least one surface of the resin film.
The flexible laminate according to any one of [ 1 ] to [ 6 ], wherein the flexible laminate has a limit number of bending of 5 ten thousand or more in a bending test in which bending is performed with the front panel side being an inner side.
The flexible laminate according to any one of [ 1 ] to [ 7 ], wherein the flexible laminate has a limit number of bending of 5 ten thousand or more in a bending test in which bending is performed with the front panel side being an outer side.
An image display device comprising the flexible laminate according to any one of [ 1 ] to [ 8 ], wherein the front panel is disposed on a front surface.
According to the present invention, a flexible laminate having impact resistance and excellent bendability, and an image display device including the flexible laminate can be provided.
Drawings
Fig. 1 is a schematic cross-sectional view schematically showing an example of a flexible laminate according to the present invention.
Fig. 2 is a schematic cross-sectional view schematically showing an example of the image display device of the present invention.
Description of the symbols
10 front panel, 201 st adhesive layer, 30 circular polarizing plate, 31 linear polarizing plate, 32 retardation layer, 40 nd 2 nd adhesive layer, 50 touch sensor panel, 60 lamination layer, 100 flexible laminate, 200 display laminate, 300 image display device.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the embodiments below. In all the drawings below, the scale of each component shown in the drawings is not necessarily the same as the scale of the actual component, and the scale is appropriately adjusted to facilitate understanding of each component.
(Flexible laminate)
Fig. 1 is a schematic cross-sectional view schematically showing an example of a flexible laminate according to the present embodiment. The flexible laminate 100 includes a front panel 10, a 1 st adhesive layer 20, a circularly polarizing plate 30, a 2 nd adhesive layer 40, and a touch sensor panel (hereinafter, sometimes referred to as a "TS panel") 50. As shown in fig. 1, the flexible laminate 100 is formed by laminating a front panel 10, a 1 st adhesive layer 20, a circularly polarizing plate 30, a 2 nd adhesive layer 40, and a TS panel 50 in this order from the viewing side.
The flexible laminate 100 has flexibility, and thus can be applied to an image display device (flexible display) that can be bent, rolled, or the like. The flexible laminate 100 of the present embodiment is excellent in bendability (hereinafter, sometimes referred to as "bendability (in)") in which the front panel 10 side is bent as an inner side. Specifically, the flexible laminate 100 can have a flexibility of 5 ten thousand or more, which is a limit number of times of bending of cracks or swelling of the adhesive layer in a region where bending occurs in a flexibility (in) test in examples described later, and the limit number of times of bending is preferably 10 ten thousand or more, and more preferably 20 ten thousand or more.
In addition to the above-described bendability (in), the flexible laminate 100 according to one embodiment can be a flexible laminate having excellent bendability (hereinafter, sometimes referred to as "bendability (out)") in which the front panel 10 side is bent as the outer side. Specifically, the flexible laminate 100 preferably has a bendability with a limit number of bending of 5 ten thousand or more, more preferably 10 ten thousand or more, and even more preferably 20 ten thousand or more, in a bendability (out) test of examples described later.
The flexible laminate 100 can constitute an image display device as described above, and is particularly suitable for a flexible display that can be bent, rolled, or the like, and further, the flexible laminate 100 is provided with the circularly polarizing plate 30, and therefore, can be used as an antireflection film for an organic electroluminescence (E L) display device, for example.
The flexible laminate 100 satisfies the following relation (i) when the thickness of the front panel 10 is a [ mu ] m, the thickness of the 1 st adhesive layer 20 is b [ mu ] m, the thickness of the circularly polarizing plate 30 is c [ mu ] m, the thickness of the 2 nd adhesive layer 40 is d [ mu ] m, the thickness of the TS panel 50 is e [ mu ] m, and the tensile modulus of elasticity of the front panel at a temperature of 23 ℃ and a relative humidity of 55% is Ea [ GPa ]:
{Ea×(a+b)}/(a+b+c+d+e)≥1.5 (i)。
hereinafter, the total thickness t [ μm ] of the front panel 10, the 1 st adhesive layer 20, the circularly polarizing plate 30, the 2 nd adhesive layer 40, and the TS panel 50 may be expressed by the following formula (iii):
t＝a+b+c+d+e (iii)。
in the formula (i), { Ea × (a + b) }/t (here, t is represented by the formula (iii)), is preferably 1.65 or more, more preferably 1.70 or more, and may be 2.00 or more, or 2.50 or more, and usually 6.00 or less, or 5.50 or less, or 5.00 or less, or 4.50 or less.
The flexible laminate 100 is provided on the image display device so that the front panel 10 side becomes the front surface side (viewing side). therefore, from the viewpoint of impact resistance of the flexible laminate 100, it is preferable that the thickness a of the front panel 10 positioned on the front surface side of the image display device and the thickness b of the 1 st adhesive layer 20 are large, and from the viewpoint of impact resistance of the flexible laminate 100, the tensile elastic modulus Ea of the front panel 10 is also large, and from the viewpoint of flexibility of the flexible laminate 100, it is preferable that the total thickness t shown in the above formula (iii) is small, and therefore, in the flexible laminate 100, in order to achieve both impact resistance and flexibility, in { Ea × (a + b) }/t in the above formula (i), it is considered that the denominator the numerator is small and the numerator is large.
By satisfying the relationship of the above expression (i), the flexible laminate 100 can have good impact resistance, and can be a flexible laminate 100 having excellent bendability (in) in which the front panel 10 side is bent inward in particular.
The total thickness shown by the above formula (iii) is not particularly limited, but in recent years, thinning and weight reduction of an image display device have been advanced, and members used in the image display device tend to be thinned and reduced in weight, and the flexible laminate 100 is also required to be reduced in thickness. Therefore, the flexible laminate 100 is also required to be thin, and the thickness thereof is preferably 250 μm or less, more preferably 220 μm or less, and may be 200 μm or less, and may be 180 μm or less, and may be 150 μm or less, and usually 40 μm or more, and may be 70 μm or more.
The flexible laminate 100 preferably satisfies the following formula (iv):
(b+d)/t≥0.5 (iv)。
the ratio (b + d)/t in the formula (iv) is more preferably 0.5 or more, still more preferably 0.6 or more, and may be 0.65 or more, usually 0.9 or less, and may be 0.8 or less. By the flexible laminate 100 satisfying the relationship of the formula (iv), the 1 st adhesive layer 20 and the 2 nd adhesive layer 40 can be formed in the flexible laminate 100 to have a thickness equal to or larger than a certain thickness. This can ensure the flexibility of the flexible laminate 100, and improve the impact absorption and impact resistance of the entire flexible laminate 100.
In the flexible laminate 100, the above-described tensile elastic modulus Ea of the front panel 10, the thickness b of the 1 st adhesive layer 20, and the thickness d of the 2 nd adhesive layer 40 preferably satisfy the relationship of the following formula (ii):
b/(Ea×d)≥0.3 (ii)。
b/(Ea × d) in the above formula (ii) is preferably 0.40 or more, more preferably 0.50 or more, and is usually 3.0 or less, preferably 2.5 or less, more preferably 2.0 or less, and may be 1.8 or less.
The flexible laminate 100 has flexibility, from the viewpoint of providing the flexible laminate 100 with good flexibility (in) and flexibility (out), the thickness d of the 2 nd adhesive layer 40 is preferably small (that is, b/d is large), and if the shear stress at the time of bending the flexible laminate 100 is made small, the flexible laminate 100 is easily bent, and therefore, the smaller the tensile elastic modulus Ea of the front panel 10 (that is, 1/Ea is large) is more preferable, and therefore, in the flexible laminate 100, in order to make the flexibility (in) and the flexibility (out) good, in b/(Ea × d) of the above formula (ii), it is considered that the denominator is decreased and the numerator is increased.
By the flexible laminate 100 satisfying the relationship of the above expression (ii), a flexible laminate having excellent bendability (out) in which the front panel 10 side is bent outward in addition to the bendability (in) described above can be obtained.
The flexible laminate 100 further preferably has a thickness b of the 1 st adhesive layer 20 and a thickness d of the 2 nd adhesive layer 40 satisfying the following relationship (v):
0.5≦b/d≦7 (v)。
the thickness b of the 1 st pressure-sensitive adhesive layer 20 is preferably larger than the thickness d of the 2 nd pressure-sensitive adhesive layer 40, and therefore, b/d in the above formula (v) is more preferably 1 or more, further preferably 1.5 or more, and may be 2 or more, and may be 3 or more. In the formula (v), b/d is preferably 6 or less, more preferably 5.5 or less, and may be 5 or less. When the thickness b of the 1 st pressure-sensitive adhesive layer 20 and the thickness d of the 2 nd pressure-sensitive adhesive layer 40 are in the relationship of the above formula (v), a flexible laminate 100 having excellent flexibility can be obtained in which the front panel 10 is bent particularly inward.
The shape of the flexible laminate 100 in the plane direction is not particularly limited, but is preferably a square shape, and more preferably a rectangular shape. When the flexible laminate 100 has a rectangular shape, the length of the long side is preferably 50mm to 300mm, and may be 100mm to 280mm, and the length of the short side is preferably 30mm to 250mm, and may be 60mm to 220mm, for example. The flexible laminate 100 may have a rounded square shape obtained by R-processing at least 1 of the corners of the square shape, or may have a square shape having a cutout on at least one side. In addition, the flexible laminate 100 may be provided with a hole penetrating in the lamination direction.
(front panel)
The front panel 10 is a plate-like body that can function as a layer for protecting a display element of an image display device or the like and can transmit light, and the plate-like body is preferably made of glass or resin in general. The front panel 10 may be disposed at the outermost surface of the image display device. The front panel 10 is preferably a resin film or a resin film with a hard coat layer having a hard coat layer provided on at least one surface of the resin film to further increase the hardness. In addition, the front panel 10 may have a blue light cut-off function, a viewing angle adjustment function, and the like.
The resin film forming the front panel 10 is not limited as long as it is a resin film that can transmit light. Examples of the film include films formed of polymers such as triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, polyester, polystyrene, polyamide, polyetherimide, poly (meth) acrylic acid, polyimide, polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyetherketone, polyetheretherketone, polyethersulfone, poly (meth) methyl acrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, and polyamideimide. These polymers may be used alone or in combination of 2 or more. When the image display device 300 is a flexible display, a resin film formed of a polymer such as polyimide, polyamide, or polyamideimide is preferably used so as to have excellent flexibility, high strength, and high transparency.
The resin film with a hard coat layer forming the front panel 10 may have a hard coat layer on one side of the resin film or may have a hard coat layer on both sides of the resin film. When the resin film has hard coat layers on both surfaces thereof, the composition and thickness of each hard coat layer may be the same or different from each other. The resin film with a hard coat layer can have improved hardness and scratch resistance as compared with a resin film without a hard coat layer.
The hard coat layer of the resin film with a hard coat layer is a cured layer of, for example, an ultraviolet curable resin. Examples of the ultraviolet curable resin include (meth) acrylic resins such as monofunctional (meth) acrylic resins, polyfunctional (meth) acrylic resins, and polyfunctional (meth) acrylic resins having a dendrimer structure; a silicone resin; a polyester resin; a urethane resin; an amide resin; epoxy resins, and the like. The hard coating may contain additives for the purpose of improving strength. The additive is not limited, and examples thereof include inorganic fine particles, organic fine particles, and a mixture thereof.
The rigidity of the front panel 10 at a temperature of 23 ℃ and a relative humidity of 55% is 0.090GPa mm or more, more preferably 0.12GPa mm or more, still more preferably 0.2GPa mm or more, still more preferably 0.25GPa mm or more, and yet more preferably 0.7GPa mm or less, and may be 0.6GPa mm or less, and may be 0.5GPa mm or less. If the rigidity of the front panel 10 is small, the flexibility of the flexible laminate 100 tends to be improved, while the impact resistance tends to be reduced, and if the rigidity of the front panel 10 is large, the impact resistance of the flexible laminate 100 tends to be improved, while the flexibility tends to be reduced. When the rigidity of the front panel 10 is in the above range, the flexible laminate 100 satisfies the above formula (i) or the relationship between the above formulae (i) and (ii), and thus the flexible laminate 100 having impact resistance and excellent bendability can be obtained favorably.
The rigidity of the front panel 10 can be determined by the tensile elastic modulus Ea [ GPa ] of the whole front panel 10 at a temperature of 23 ℃ and a relative humidity of 55%]Thickness [ mm ] of the whole of the front panel 10]Product of (Ea [ GPa ]]×a[μm]×10－3) And then calculated. The thickness a of the front panel 10 may be, for example, 30 to 200. mu.m, preferably 50 to 150. mu.m, more preferably 50 to 100. mu.m, and may be 90 μm or less. The tensile elastic modulus Ea of the front panel 10 is, for example, preferably 1GPa or more, more preferably 2GPa or more, further preferably 3GPa or more, and further preferably 30GPa or less, more preferably 20GPa or less, further preferably 10GPa or less.
(1 st adhesive layer)
The 1 st adhesive layer 20 is a layer for bonding the front panel 10 and the circularly polarizing plate 30, and may be formed using an adhesive composition. The thickness b of the 1 st pressure-sensitive adhesive layer 20 is not particularly limited as long as it satisfies the relationship between the above-mentioned formulas (i) and (ii), and is preferably 5 μm or more, more preferably 7 μm or more, further preferably 10 μm or more, and may be 20 μm or more, and may be 30 μm or more, and is usually 200 μm or less, preferably 100 μm or less, and more preferably 80 μm or less.
The storage elastic modulus Gb of the 1 st pressure-sensitive adhesive layer 20 at a temperature of 25 ℃ and a relative humidity of 50% is preferably 0.005MPa or more, may be 0.007MPa or more, and may be 0.01MPa or more, and is preferably 0.2MPa or less, and may be 0.17MPa or less, and may be 0.15MPa or less.
If the storage elastic modulus Gb of the 1 st pressure-sensitive adhesive layer 20 becomes small, the impact resistance of the flexible laminate 100 tends to decrease, and if the storage elastic modulus Gb of the 1 st pressure-sensitive adhesive layer 20 becomes large, the flexibility of the flexible laminate 100 tends to decrease. When the storage elastic modulus Gb of the first pressure-sensitive adhesive layer 20 is in the above range, the flexible laminate 100 satisfies the above formula (i) or the relationship between the above formulae (i) and (ii), and the flexible laminate 100 having impact resistance and excellent bendability can be obtained favorably.
The 1 st pressure-sensitive adhesive layer 20 may be composed of a pressure-sensitive adhesive composition containing a resin such as a (meth) acrylic, rubber, urethane, ester, silicone, or polyvinyl ether resin as a main component. 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 containing 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 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 contain only the above-mentioned base polymer, but usually further contains a crosslinking agent. Examples of the crosslinking agent include metal ions having a valence of 2 or more and a metal carboxylate salt formed between the crosslinking agent and a carboxyl group; polyamine compounds and substances which form amide bonds with carboxyl groups; a polyepoxy compound or a polyhydric alcohol and forming an ester bond with a carboxyl group; a polyisocyanate compound and a substance forming an amide bond with a carboxyl group. Among them, polyisocyanate compounds are preferable.
The active energy ray-curable pressure-sensitive adhesive composition is a pressure-sensitive adhesive composition having a property of being cured by irradiation with an active energy ray such as an ultraviolet ray or an electron beam, and having a property of having adhesiveness even before irradiation with an active energy ray and being capable of being bonded to an adherend such as a film and being cured by irradiation with an active energy ray, thereby adjusting the bonding force. The active energy ray-curable adhesive composition is preferably an ultraviolet-curable adhesive composition. The active energy ray-curable adhesive composition further contains an active energy ray-polymerizable compound in addition to the base polymer and the crosslinking agent. Further, a photopolymerization initiator, a photosensitizer and the like may be contained as necessary.
The pressure-sensitive adhesive composition may contain additives such as fine particles, beads (resin beads, glass beads, and the like), glass fibers, resins other than the base polymer, tackifiers, fillers (metal powders, other inorganic powders, and the like), antioxidants, ultraviolet absorbers, dyes, pigments, colorants, defoamers, anticorrosion agents, and photopolymerization initiators for imparting light scattering properties.
The 1 st adhesive layer 20 can be formed by applying an organic solvent diluted solution of the adhesive composition described above to a substrate and drying it.
(circular polarizing plate)
The circularly polarizing plate 30 may include a linearly polarizing plate 31 and a retardation layer 32, and the linearly polarizing plate 31 may be disposed on the 1 st adhesive layer 20 side and the retardation layer 32 may be disposed on the 2 nd adhesive layer 40 side. The circularly polarizing plate 30 can convert light (external light) emitted from the display element side of the image display device having the flexible laminate 100 through the flexible laminate 100 into circularly polarized light.
Further, since the circularly polarizing plate 30 can suppress the emission of reflected light of external light, the flexible laminate 100 can be provided with a function as an antireflection film.
The rigidity of the circularly polarizing plate 30 at a temperature of 23 ℃ and a relative humidity of 55% is preferably 40MPa · mm or more, may be 80MPa · mm or more, and may be 100MPa · mm or more, and is preferably 700MPa · mm or less, may be 600MPa · mm or less, and may be 500MPa · mm or less, and may be 400MPa · mm or less, and may be 200MPa · mm or less, and may be 100MPa · mm or less. If the rigidity of the circularly polarizing plate 30 is reduced, the flexibility of the flexible laminate 100 tends to be improved, while the impact resistance tends to be reduced, and if the rigidity of the circularly polarizing plate 30 is increased, the impact resistance of the flexible laminate 100 tends to be improved, while the flexibility tends to be reduced. When the rigidity of the circularly polarizing plate 30 is in the above range, the flexible laminate 100 satisfies the above formula (i) or the relationship between the above formulae (i) and (ii), and thus the flexible laminate 100 having impact resistance and excellent bendability can be obtained favorably.
Rigidity [ MPa.mm ] of the circularly polarizing plate 30]The tensile elastic modulus Ec [ MPa ] at 23 ℃ and 55% relative humidity of the entire circularly polarizing plate 30 can be determined]Thickness [ mm ] of the entire circular polarizing plate 30]Product of (Ec [ MPa ])]×c[μm]×10－3) And then calculated.
(Linear polarizer)
The linearly polarizing plate 31 has a function of selectively transmitting linearly polarized light in a certain direction from a light beam of unpolarized light such as natural light. Examples of the linearly polarizing plate 31 include a film contained in a polarizer, which is a stretched film having a dye having absorption anisotropy absorbed thereon, or a film obtained by coating and curing a dye having absorption anisotropy. Examples of the dye having absorption anisotropy include dichroic dyes. 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 or tetraazo. Examples of the film coated with a dye having absorption anisotropy, which is used as a polarizer, include a stretched film in which a dye having absorption anisotropy is adsorbed, and a film having a layer obtained by coating a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a polymerizable liquid crystal and curing the composition. The film obtained by applying and curing the dye having absorption anisotropy is preferable to the stretched film having the dye having absorption anisotropy absorbed thereon because the bending direction of the film is not limited.
(polarizing plate having a stretched film as a polarizer)
A description will be given of a linear polarizing plate including, as a polarizer, a stretched film having a dye having absorption anisotropy adsorbed thereon. A stretched film as a polarizer, to which a dye having absorption anisotropy is adsorbed, is generally produced through the following steps: the method for producing a polyvinyl alcohol film comprises a step of uniaxially stretching a polyvinyl alcohol resin film, a step of dyeing the polyvinyl alcohol resin film with a dichroic dye to adsorb the dichroic dye, a step of treating the polyvinyl alcohol resin film adsorbed with the dichroic dye 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 polarizing plate obtained by laminating a transparent protective film on one or both surfaces thereof may be used as a linear polarizing plate. The thickness of the polarizer thus obtained is preferably 2 μm to 40 μm.
The polyvinyl alcohol resin can be 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 about 85 to 100 mol%, and 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 about 1000 to 10000, and preferably in the range of 1500 to 5000.
A film obtained by forming such a polyvinyl alcohol resin is used as a raw film for a polarizer. The method for forming the film from the polyvinyl alcohol resin is not particularly limited, and the film can be formed by a known method. The thickness of the polyvinyl alcohol-based raw film may be, for example, about 10 μm to 150 μm.
The uniaxial stretching of the polyvinyl alcohol resin film may be performed before, simultaneously with, or after the dyeing with the dichroic dye. When the uniaxial stretching is performed after dyeing, the uniaxial stretching may be performed before the boric acid treatment or may be performed in the boric acid treatment. In addition, uniaxial stretching may be performed in these plural stages. In the case of uniaxial stretching, the stretching may be performed uniaxially between rolls having different peripheral speeds, or may be performed uniaxially using a heat roll. The uniaxial stretching may be dry stretching in which stretching is performed in the air, or wet stretching in which stretching is performed in a state where the polyvinyl alcohol resin film is swollen with a solvent. The draw ratio is usually about 3 to 8 times.
The thickness of the linearly polarizing plate provided with a stretched film as a polarizer may be, for example, 1 μm to 400 μm, or 5 μm or more, or 7 μm or more, or 100 μm or less, or 50 μm or less, or 20 μm or less, or 10 μm or less. The linear polarizing plate having a stretched film as a polarizer may have a tensile elastic modulus at a temperature of 25 ℃ of, for example, 1GPa to 20 GPa.
The material of the protective film to be attached to one or both surfaces of the polarizer is not particularly limited, and examples thereof include films known in the art, such as a cyclic polyolefin resin film, an acetate resin film made of a resin such as triacetyl cellulose or diacetyl cellulose, a polyester resin film made of a resin such as polyethylene terephthalate, polyethylene naphthalate or polybutylene terephthalate, a polycarbonate resin film, a (meth) acrylic resin film, and a polypropylene resin film. From the viewpoint of thinning, the thickness of the protective film is usually 300 μm or less, preferably 200 μm or less, more preferably 100 μm or less, and usually 5 μm or more, preferably 20 μm or more. The protective film may or may not have a phase difference.
(polarizing plate having polarizer made of film formed of liquid crystal layer)
A linear polarizing plate including a film formed of a liquid crystal layer as a polarizer will be described. Examples of the film coated with a dye having absorption anisotropy, which is used as a polarizer, include films obtained by applying a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a liquid crystal compound to a substrate and curing the composition. The film may be used as a linear polarizer by peeling off or using a substrate together with the substrate, or may be used as a linear polarizer having a structure in which a protective film is provided on one surface or both surfaces thereof. Examples of the protective film include those similar to the linear polarizing plate having the stretched film as the polarizer.
Specific examples of the film coated with the dye having absorption anisotropy include films described in japanese patent application laid-open nos. 2013-37353 and 2013-33249.
The thinner the film obtained by applying and curing a pigment having absorption anisotropy, the more preferable it is, but if it is too thin, the strength tends to decrease and the processability tends to deteriorate. The thickness of the film is usually 20 μm or less, preferably 5 μm or less, and more preferably 0.5 to 3 μm or less. The thickness of the linearly polarizing plate having the polarizer formed of the liquid crystal layer may be, for example, 1 to 50 μm, and the tensile elastic modulus at a temperature of 23 ℃ and a relative humidity of 55% of the linearly polarizing plate having the polarizer formed of the liquid crystal layer may be, for example, 0.5 to 5 GPa.
(retardation layer)
The retardation layer 32 may be 1 layer or 2 or more layers. Further, the retardation film may have an overcoat layer for protecting the surface of the retardation layer and a base film for supporting the retardation layer. The phase difference layer 32 includes a λ/4 layer, and may further include a λ/2 layer and a positive C layer. When the retardation layer 32 includes a λ/2 layer, a λ/2 layer and a λ/4 layer are stacked in this order from the linearly polarizing plate 31 side. When the retardation layer 32 includes a positive C layer, the λ/4 layer and the positive C layer may be stacked in this order from the linearly polarizing plate 31 side, or the positive C layer and the λ/4 layer may be stacked in this order from the linearly polarizing plate 31 side.
The retardation layer 32 may be formed of the resin film exemplified as the material of the protective film, or may be formed of a layer obtained by curing a polymerizable liquid crystal compound. The retardation layer 32 may further include an alignment film or a base film, or may have a lamination layer for laminating a λ/4 layer, a λ/2 layer, or a positive C layer. The adhesive layer is an adhesive layer or an adhesive layer, and can be formed using the adhesive composition described above or a known adhesive composition. Examples of known adhesive compositions include aqueous adhesive compositions such as polyvinyl alcohol resin aqueous solutions and aqueous two-pack type urethane emulsion adhesives; and an active energy ray-curable adhesive composition which cures when irradiated with an active energy ray such as ultraviolet ray.
The thickness of the entire retardation layer may be, for example, 1 to 50 μm
(No. 2 adhesive layer)
The 2 nd adhesive layer 40 is a layer for bonding the circularly polarizing plate 30 and the TS panel 50, and may be formed using an adhesive composition. The thickness d of the 2 nd pressure-sensitive adhesive layer 40 is not particularly limited as long as it satisfies the relationship between the above-mentioned formulas (i) and (ii), and is preferably 5 μm or more, may be 10 μm or more, may be 15 μm or more, may be 20 μm or more, and is usually 100 μm or less, preferably 80 μm or less, and more preferably 60 μm or less.
The storage elastic modulus Gb of the 2 nd pressure-sensitive adhesive layer 40 at a temperature of 25 ℃ and a relative humidity of 50% is preferably 0.01MPa or more, may be 0.02MPa or more, may be 0.03MPa or more, may be 0.05MPa or more, and is preferably 0.2MPa or less, may be 0.15MPa or less, may be 0.12MPa or less, and may be 0.10MPa or less.
If the storage elastic modulus Gd of the 2 nd adhesive layer 40 is small, the impact resistance of the flexible laminate 100 tends to decrease, and if the storage elastic modulus Gd of the 2 nd adhesive layer 40 is large, the flexibility of the flexible laminate 100 tends to decrease. When the storage elastic modulus Gd of the 2 nd pressure-sensitive adhesive layer 40 is in the above range, the flexible laminate 100 satisfies the above formula (i) or the relationship between the above formulae (i) and (ii), and thus the flexible laminate 100 having impact resistance and excellent bendability can be obtained favorably.
As the adhesive composition constituting the 2 nd adhesive layer 40, an adhesive composition exemplified as the adhesive composition constituting the 1 st adhesive layer 20 can be used. The adhesive composition constituting the 2 nd adhesive layer 40 may be the same as or different from the adhesive composition constituting the 1 st adhesive layer 20. The 2 nd adhesive layer 40 may be formed in the same manner as the 1 st adhesive layer 20.
(touch sensor panel)
The TS panel 50 is not limited to a detection method as long as it is a sensor capable of detecting a touched position, and examples thereof include TS panels of a resistive film method, a capacitive coupling method, an optical sensor method, an ultrasonic wave method, an electromagnetic induction coupling method, a surface acoustic wave method, and the like. In view of low cost, a TS panel of a resistive film type or a capacitive coupling type is preferably used.
An example of a resistive-film TS panel includes a pair of substrates arranged to face each other, an insulating spacer sandwiched between the pair of substrates, a transparent conductive film provided as a resistive film on the inner front surface of each substrate, and a touch position detection circuit. In an image display device provided with a resistive touch sensor panel, if the surface of the front panel 10 is touched, the opposing resistive films are short-circuited, and a current flows through the resistive films. The touch position detection circuit detects the change of the voltage at the moment and detects the touched position.
One example of the TS panel of the capacitive coupling system is constituted by a substrate, and a position detection transparent electrode provided on the entire surface of the substrate is constituted by a touch position detection circuit. In an image display device provided with a TS panel of the capacitive coupling method, if the surface of the front panel 10 is touched, the transparent electrode is grounded at the touched point via the electrostatic capacitance of the human body. The touch position detection circuit detects the grounding of the transparent electrode and detects the touched position.
The TS panel 50 may be configured only by the touch sensor pattern layer, or may include the touch sensor pattern layer and a support layer supporting the touch sensor pattern layer. When the TS panel 50 includes the touch sensor pattern layer and the support layer, the touch sensor pattern layer and the support layer may be joined by a bonding layer, or the touch sensor pattern layer may be formed on the support layer without interposing the bonding layer. The adhesive layer is an adhesive layer or an adhesive layer, and can be formed using the adhesive composition and the adhesive composition described above.
The touch sensor pattern layer included in the TS panel 50 may include a conductive layer such as an electrode or a wiring. The conductive layer is preferably formed so as not to be visually recognized when used as the TS panel 50 in a flexible laminate. The touch sensor pattern layer may include a separation layer. The separation layer may be formed on a substrate such as glass, and is provided to separate the touch sensor pattern layer formed on the separation layer from the substrate together with the separation layer. The separation layer is preferably an inorganic layer or an organic layer. Examples of the material for forming the inorganic layer include silicon oxide. Examples of the material for forming the organic layer include a (meth) acrylic resin composition, an epoxy resin composition, and a polyimide resin composition. The touch sensor pattern layer may further include at least 1 protective layer. The protective layer may be in contact with the conductive layer and provided to support the 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, evaporation, or the like. The conductive layer may be a transparent conductive layer made of a metal oxide such as ITO, or may be a metal layer made of a metal such as aluminum, copper, silver, or gold. The touch sensor pattern layer may be formed only of a conductive layer such as an electrode or a wiring. The support layer is preferably a resin film, and examples of the support layer include a polyester resin film such as a cycloolefin resin film and a polyethylene terephthalate resin film, an acrylic resin film, and a triacetyl cellulose resin film.
The rigidity of the TS panel 50 at a temperature of 23 ℃ and a relative humidity of 55% is preferably 15MPa · mm or more, may be 50MPa · mm or more, and may be 100MPa · mm or more, and is preferably 700MPa · mm or less, and may be 600MPa · mm or less, and may be 500MPa · mm or less. If the stiffness of the TS panel 50 is reduced, the flexibility of the flexible laminate 100 tends to be improved, while the impact resistance tends to be reduced, and if the stiffness of the TS panel 50 is increased, the impact resistance of the flexible laminate 100 tends to be improved, while the flexibility tends to be reduced. When the stiffness of the TS panel 50 is in the above range, the flexible laminate 100 satisfies the above formula (i) or the relationship between the above formulae (i) and (ii), and the flexible laminate 100 having good impact resistance and excellent bendability can be obtained favorably.
Rigidity [ MPa.mm ] of TS panel 50]Can pass through the tensile elastic modulus Ee [ MPa ] of the TS panel 50 at the temperature of 23 ℃ and the relative humidity of 55 percent]Thickness [ mm ] of TS panel 50]Product of (Ee [ MPa ]]×e[μm]×10－3) And then calculated. The thickness e of the TS panel 50 may be, for example, 3 to 100 μm, or 5 to 50 μm, or 5 to 30 μm, or 5 to 20 μm. The tensile elastic modulus Ee of the touch sensor panel may be, for example, 1GPa to 7GPa, or 1.2GPa to 6 GPa.
(image display device)
Fig. 2 is a schematic cross-sectional view schematically showing an example of the image display device of the present embodiment. The image display device 300 includes a flexible laminate 100 including a front panel 10 disposed on a front surface (a viewing side) thereof, a display laminate 200 including a display cell, and a bonding layer 60, and the display laminate 200 is laminated on the circularly polarizing plate 30 side of the flexible laminate 100 via the bonding layer 60. Since the flexible laminate 100 of the image display device 300 includes the TS panel 50, it can be used as a touch panel display device.
The image display device 300 may be a flexible display panel. The image display device as a flexible display may be configured such that the front panel 10 can be folded with the front surface thereof facing inward, or may be configured such that the front panel 10 can be rolled with the front surface thereof facing inward.
The laminating layer 60 is used to laminate the circular polarizer 30 and the display laminate 200 in the flexible laminate 100. When the flexible laminate 100 and the display laminate 200 are laminated, for example, the adhesive layer 60 may be provided on the circularly polarizing plate 30 of the flexible laminate 100, and the display laminate 200 may be laminated on the adhesive layer 60. The adhesive layer 60 is an adhesive layer or an adhesive layer, and can be formed using the adhesive composition and the adhesive composition described above.
Examples of the display cell included in the display laminate 200 include display cells including display elements such as a liquid crystal display element, an organic E L display element, an inorganic E L display element, a plasma display element, and a field emission display element.
The image display device 300 can be used as a mobile device such as a smart phone or a tablet computer, a television, a digital photo frame, an electronic sign, a measuring instrument, a meter, an office machine, a medical machine, a personal computer, or the like.
Examples
The present invention will be described in further detail with reference to examples, but the present invention is not limited to these examples. In examples and comparative examples, "%" and "part(s)" are% by mass and part(s) by mass unless otherwise specified.
[ thickness sensing ]
The thickness of each layer forming the flexible laminate was measured by the following procedure. The flexible laminate was cut with a laser cutter, the cross section of the cut flexible laminate was observed with a transmission type electron microscope (SU8010, manufactured by horiba ltd), and the thickness of each layer forming the flexible laminate was measured from the obtained observation image.
[ measurement of tensile elastic modulus ]
The tensile modulus was measured at a temperature of 23 ℃ and a relative humidity of 55% by using a tensile tester (AG-1S, manufactured by Shimadzu corporation). When the object to be measured is a retardation layer, the tensile modulus in the slow axis direction is measured.
[ calculation of rigidity ]
The rigidity is calculated by calculating the product of the thickness value and the tensile modulus value.
[ storage modulus of elasticity' Scale ]
The storage elastic modulus (Gb, Gd) of the measurement sample in which the pressure-sensitive adhesive layers (1 st pressure-sensitive adhesive layer or 2 nd pressure-sensitive adhesive layer) were stacked to have a thickness of 150 μm was measured using a rheometer (Anton Parr, MCR-301) under conditions of a temperature of 25 ℃, a relative humidity of 50%, a stress of 1%, and a frequency of 1 Hz.
[ impact resistance test ]
The touch sensor panel side of the flexible laminates obtained in examples and comparative examples was fixed to Glass (Soda Glass 1.1T, JMC Glass Co.) using an optical adhesive sheet (8146-04, 3M) having a thickness of 100 μ M, and samples for evaluation were prepared. The sample for evaluation was set in an impact resistance test apparatus (DropTester, manufactured by TAEWON TECH co.) so that the front panel side was upward, and then an impact resistance test was performed at a temperature of 25 ℃ by allowing a test ball to freely fall from a position 5cm above the surface of the front panel side of the panel for evaluation. The impact resistance test was carried out while changing the weight of the test ball, and the weight of the test ball at the time of glass cracking located in the lower portion of the sample for evaluation was determined. A represents the weight of the test ball at the time of glass fracture of the evaluation sample as 100g or more,
b is set to be 50g or more and less than 100g,
the case of less than 50g is set as C,
impact resistance was evaluated.
[ bending test ]
(1) Bending Property (in) test
In order to evaluate the bendability (in) in which the front panel side is bent at a temperature of 25 ℃, the bendability (in) test was performed by the procedure shown below. The flexible laminates obtained in examples and comparative examples were set in a flat state (unbent state) in a bending tester (CFT-720C, Covotech), and a bending operation was performed to return the flexible laminates to an original flat state after bending the flexible laminates so that the distance between the facing front panels when the front panel side was bent inward was 4.0 mm. The bending operation was repeated 1 time by the number of bending times 1 time. The number of bending times when cracks or swelling of the adhesive layer occurred in the region bent by the bending operation was determined as the limit number of bending times. The occurrence of cracks or bulging of the adhesive layer in the area to be bent by the bending operation
A was set as a case where no bending was found even when the number of times of bending reached 20 ten thousand,
b represents a case where the number of bending times is 10 ten thousand or more and less than 20 ten thousand,
c is a number of bends found when the number of bends is 5 ten thousand or more and less than 10 ten thousand,
D represents a case found when the number of bending times is less than 5 ten thousand,
the bending property (in) test was evaluated.
(2) Bending (out) test
In order to evaluate the bendability (out) in which the front panel side is bent to the outside, the bending operation was repeated in the same procedure as the above-described bendability (in) test (1) except that the flexible laminate was bent so that the distance between the TS panel sensors when the front panel side was bent to the outside was 4.0mm, and the limit number of times of bending was confirmed. The evaluation of the bending property (out) test was also performed in the same manner as the evaluation of the bending property (in) test.
[ example 1 ]
(preparation of front Panel)
A resin film with a hard coat layer having a thickness of 60 μm and a hard coat layer formed on one surface of the resin film was prepared as a front panel. The resin film is a polyimide-based resin film having a thickness of 50 μm, and the hard coat layer is a layer having a thickness of 10 μm and formed of a composition containing a dendrimer compound having a polyfunctional acrylic group at the end.
(preparation of adhesive layer 1)
An acrylic pressure-sensitive adhesive composition was applied to the release film, and the release film-attached 1 st pressure-sensitive adhesive layer on which the 1 st pressure-sensitive adhesive layer was formed was dried. The 1 st adhesive layer has a thickness of 50 μm and a storage elastic modulus Gb of 0.09MPa at a temperature of 25 ℃ and a relative humidity of 50%.
(preparation of circular polarizing plate)
A polyvinyl alcohol (PVA) film having an average polymerization degree of about 2400, a saponification degree of 99.9 mol% or more and a thickness of 20 μm was prepared. The PVA film was immersed in pure water at 30 ℃ and then immersed in an aqueous solution having an iodine/potassium iodide/water mass ratio of 0.02/2/100 at 30 ℃ to carry out iodine dyeing (iodine dyeing step). The PVA film subjected to the iodine dyeing step was immersed in an aqueous solution having a potassium iodide/boric acid/water mass ratio of 12/5/100 at 56.5 ℃ to be subjected to boric acid treatment (boric acid treatment step). The PVA film subjected to the boric acid treatment step was washed with pure water at 8 ℃ and then dried at 65 ℃ to obtain a polarizer in which iodine was adsorbed and oriented to polyvinyl alcohol. The PVA film is stretched in the iodine dyeing step and the boric acid treatment step. The total draw ratio of the PVA film was 5.3 times. The thickness of the resulting polarizer was 7 μm.
The polarizer obtained above was bonded to a 13 μm thick cycloolefin polymer (COP) film (ZF-14, manufactured by Nippon Zeon corporation, in which the in-plane retardation value at a wavelength of 550Nm was 1Nm) via a water-based adhesive with nip rolls, and the obtained bonded product was dried at 60 ℃ for 2 minutes while maintaining the tension of 430Nm, to obtain a linearly polarizing plate having a COP film on one surface thereof, the water-based adhesive was prepared by adding 3 parts of carboxyl-modified polyvinyl alcohol ("KURAY POVA L K L", manufactured by KURARAY Co., Ltd.) and 1.5 parts of water-soluble polyamide epoxy Resin ("Sumirez Resin 650" (aqueous solution having a solid content of 30%) to 100 parts of water.
A retardation film was laminated on the polarizer side of the obtained linearly polarizing plate via an adhesive layer. As the retardation film, a retardation film obtained by bonding a lambda/2 layer and a lambda/4 layer with an ultraviolet-curable adhesive interposed therebetween was used. The lambda/2 layer had a layer obtained by curing a liquid crystal compound and an alignment film, and had a thickness of 3 μm. The adhesive layer had a thickness of 5 μm and a storage modulus of elasticity of 0.6MPa at a temperature of 25 ℃ and a relative humidity of 50%. The lambda/4 layer had a layer obtained by curing a liquid crystal compound and an alignment film, and had a thickness of 2 μm.
(preparation of adhesive layer 2)
The acrylic pressure-sensitive adhesive composition was applied to the release film, and dried to prepare a release film-attached 2 nd pressure-sensitive adhesive layer having a 2 nd pressure-sensitive adhesive layer formed thereon. The thickness of the 2 nd adhesive layer was 10 μm, and the storage elastic modulus Gd at a temperature of 25 ℃ and a relative humidity of 50% was 0.1 MPa.
(preparation of touch sensor Panel)
As the TS panel, a touch sensor pattern layer is prepared. The touch sensor pattern layer comprises an ITO layer as a transparent conductive layer and a cured layer of an acrylic resin composition as a release layer, and has a thickness of 7 μm and a tensile elastic modulus of 4510MPa at a temperature of 23 ℃ and a relative humidity of 55%. The rigidity of the TS panel was 31.6 MPa-mm.
(production of Flexible laminate)
One surface of the front panel and the surface of the 1 st pressure-sensitive adhesive layer with the release film on the 1 st pressure-sensitive adhesive layer side were subjected to corona treatment, and the corona-treated surfaces were bonded to each other. Next, the surface exposed by peeling the release film bonded to the 1 st adhesive layer and the surface of the circularly polarizing plate on the linear polarizing plate side were subjected to corona treatment, and the corona-treated surfaces were bonded to each other to obtain a composite of the front panel and the circularly polarizing plate. Next, the surface of the composite on the λ/4 layer side and the surface of the release film-attached 2 nd pressure-sensitive adhesive layer on the 2 nd pressure-sensitive adhesive layer side were subjected to corona treatment, and the corona-treated surfaces were bonded to each other. Next, the surface exposed by peeling the release film adhered to the 2 nd pressure-sensitive adhesive layer was subjected to corona treatment, and the corona-treated surface was laminated to the transparent conductive layer side of the TS panel to obtain a flexible laminate. The corona treatment was carried out at a frequency of 20kHz, a voltage of 8.6kV, a power of 2.5kW, and a speed of 6 m/min.
The total thickness t [ μm ] (thickness represented by the above formula (iii)) of the front panel 10, the 1 st adhesive layer 20, the circularly polarizing plate 30, the 2 nd adhesive layer 40 and the TS panel 50 of the obtained flexible laminate was 157 μm, and the longitudinal direction was 177mm, × and the transverse direction was 105 mm.
[ examples 2 to 9, comparative example 1 ]
A flexible laminate was produced by the same procedure as in example 1, except that the 1 st adhesive layer and the 2 nd adhesive layer having the thicknesses described in table 1 and the storage elastic modulus at 25 ℃. The resin films used in the front panel are all polyimide-based resin films, and the hard coat layers used in the front panel are all layers formed from a composition containing a dendrimer compound having a polyfunctional acrylic group at the end. The obtained flexible laminate was subjected to an impact resistance test, a bending property (in) test and a bending property (out) test. The results are shown in table 1.
Claims (9)
1. A flexible laminate comprising a front panel, a 1 st adhesive layer, a circularly polarizing plate, a 2 nd adhesive layer and a touch sensor panel in this order,
wherein the relation of the following formula (i) is satisfied when the thickness of the front panel is a in μm, the thickness of the 1 st adhesive layer is b in μm, the thickness of the circularly polarizing plate is c in μm, the thickness of the 2 nd adhesive layer is d in μm, the thickness of the touch sensor panel is e in μm, and the tensile elastic modulus of the front panel at a temperature of 23 ℃ and a relative humidity of 55% is Ea in GPa,
{Ea×(a+b)}/(a+b+c+d+e)≥1.5 (i)。
2. the flexible laminate according to claim 1, wherein the tensile elastic modulus Ea of the front sheet, the thickness b of the 1 st adhesive layer, and the thickness d of the 2 nd adhesive layer satisfy the following formula (ii),
b/(Ea×d)≥0.3 (ii)。
3. the flexible laminate according to claim 1 or 2, wherein the front sheet has a rigidity of 0.09 GPa-mm to 0.7 GPa-mm at a temperature of 23 ℃ and a relative humidity of 55%,
the rigidity of the circularly polarizing plate at a temperature of 23 ℃ and a relative humidity of 55% is 40 MPa.mm-400 MPa.mm,
the rigidity of the touch sensor panel at a temperature of 23 ℃ and a relative humidity of 55% is 15 MPa.mm to 700 MPa.mm.
4. The flexible laminate according to any one of claims 1 to 3, wherein the 1 st adhesive layer has a storage modulus of elasticity at 25 ℃ and 50% relative humidity of 0.01 to 0.15MPa,
the 2 nd adhesive layer has a storage elastic modulus of 0.01MPa to 0.15MPa at a temperature of 25 ℃ and a relative humidity of 50%.
5. The flexible laminate according to any one of claims 1 to 4, wherein when a total thickness t of the front sheet thickness a, the thickness b of the 1 st adhesive layer, the thickness c of the circularly polarizing plate, the thickness d of the 2 nd adhesive layer, and the thickness e of the touch sensor panel is represented by the following formula (iii),
t＝a+b+c+d+e (iii)
t is 250 μm or less.
6. The flexible laminate according to any one of claims 1 to 5, wherein the front sheet is a resin film or a resin film with a hard coating layer, the resin film having a hard coating layer on at least one surface thereof.
7. The flexible laminate according to any one of claims 1 to 6, wherein the flexible laminate has a limit number of bending times of 5 ten thousand or more in a bending test in which the front panel is bent with the front panel side being an inner side.
8. The flexible laminate according to any one of claims 1 to 7, wherein the flexible laminate has a limit number of bending times of 5 ten thousand or more in a bending test in which bending is performed with the front panel side being an outer side.
9. An image display device comprising the flexible laminate according to any one of claims 1 to 8, wherein the front panel is disposed on a front surface.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018244233 | 2018-12-27 | ||
| JP2018-244233 | 2018-12-27 | ||
| JP2019-198788 | 2019-10-31 | ||
| JP2019198788A JP6732089B2 (en) | 2018-12-27 | 2019-10-31 | Flexible laminate and image display device including the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111458782A true CN111458782A (en) | 2020-07-28 |
Family
ID=71449009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911356175.5A Pending CN111458782A (en) | 2018-12-27 | 2019-12-25 | Flexible laminate and image display device provided with same |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6732089B2 (en) |
| KR (1) | KR102220433B1 (en) |
| CN (1) | CN111458782A (en) |
| TW (1) | TWI708826B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113785228A (en) * | 2019-06-07 | 2021-12-10 | 日东电工株式会社 | Method for producing polarizing plate with phase difference layer and hard coat layer |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021157101A (en) * | 2020-03-27 | 2021-10-07 | 日東電工株式会社 | Optical film having double-sided adhesive and image display device |
| KR20230043149A (en) * | 2020-07-22 | 2023-03-30 | 닛토덴코 가부시키가이샤 | image display device |
| WO2022019260A1 (en) * | 2020-07-22 | 2022-01-27 | 日東電工株式会社 | Adhesive sheet and film with adhesive layer |
| JP7092900B2 (en) * | 2020-07-31 | 2022-06-28 | 住友化学株式会社 | Laminates and image display devices |
| WO2023032783A1 (en) * | 2021-08-31 | 2023-03-09 | 日東電工株式会社 | Multi-layer structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150099460A (en) * | 2014-02-21 | 2015-08-31 | 주식회사 엘지화학 | Touch panel |
| CN107710027A (en) * | 2015-06-30 | 2018-02-16 | 株式会社凸版巴川光学薄膜 | Hard coat film, Polarizer, display unit and display device using the hard coat film |
| JP2018028573A (en) * | 2016-08-15 | 2018-02-22 | 日東電工株式会社 | Laminate for Flexible Image Display Device and Flexible Image Display Device |
| JP2018159913A (en) * | 2017-03-02 | 2018-10-11 | 大日本印刷株式会社 | Optical film and image display device |
| WO2018216469A1 (en) * | 2017-05-26 | 2018-11-29 | 日東電工株式会社 | Optical film with pressure-sensitive adhesive on both sides, and image display device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9835793B2 (en) * | 2014-09-12 | 2017-12-05 | Apple Inc. | Display backlight with adhesive attachment layers |
| KR101659239B1 (en) | 2014-11-01 | 2016-09-23 | 삼성에스디아이 주식회사 | Flexible display apparatus |
| KR102451081B1 (en) | 2016-02-05 | 2022-10-06 | 삼성전자주식회사 | Display using various adhesive and electronic device including the same |
| KR101933765B1 (en) * | 2016-08-23 | 2018-12-28 | 동우 화인켐 주식회사 | Polarizing Plate and Image Display Device Comprising the Same |
| JP6510113B2 (en) * | 2017-05-09 | 2019-05-08 | 日東電工株式会社 | Composition for optical member, optical member and image display device |
| JP6937169B2 (en) * | 2017-06-09 | 2021-09-22 | 日東電工株式会社 | Polarizing plate with retardation layer and image display device |
| JP6768024B2 (en) * | 2018-03-26 | 2020-10-14 | リンテック株式会社 | Active energy ray-curable adhesive, adhesive sheet and laminate |
-
2019
- 2019-10-31 JP JP2019198788A patent/JP6732089B2/en active Active
- 2019-12-13 TW TW108145624A patent/TWI708826B/en not_active IP Right Cessation
- 2019-12-24 KR KR1020190174265A patent/KR102220433B1/en active IP Right Grant
- 2019-12-25 CN CN201911356175.5A patent/CN111458782A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150099460A (en) * | 2014-02-21 | 2015-08-31 | 주식회사 엘지화학 | Touch panel |
| CN107710027A (en) * | 2015-06-30 | 2018-02-16 | 株式会社凸版巴川光学薄膜 | Hard coat film, Polarizer, display unit and display device using the hard coat film |
| JP2018028573A (en) * | 2016-08-15 | 2018-02-22 | 日東電工株式会社 | Laminate for Flexible Image Display Device and Flexible Image Display Device |
| JP2018159913A (en) * | 2017-03-02 | 2018-10-11 | 大日本印刷株式会社 | Optical film and image display device |
| WO2018216469A1 (en) * | 2017-05-26 | 2018-11-29 | 日東電工株式会社 | Optical film with pressure-sensitive adhesive on both sides, and image display device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113785228A (en) * | 2019-06-07 | 2021-12-10 | 日东电工株式会社 | Method for producing polarizing plate with phase difference layer and hard coat layer |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6732089B2 (en) | 2020-07-29 |
| KR20200081288A (en) | 2020-07-07 |
| KR102220433B1 (en) | 2021-02-24 |
| TW202043398A (en) | 2020-12-01 |
| JP2020106825A (en) | 2020-07-09 |
| TWI708826B (en) | 2020-11-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111458782A (en) | Flexible laminate and image display device provided with same | |
| CN111458781A (en) | Flexible laminate and image display device provided with same | |
| KR102443686B1 (en) | Manufacturing method of optical laminate and display device | |
| JP2019191560A (en) | Optical laminate and manufacturing method thereof | |
| CN113631363A (en) | Laminate and display device | |
| CN113015928A (en) | Optical laminate and image display device provided with same | |
| WO2020170726A1 (en) | Flexible layered body and image display device provided with same | |
| CN113396345B (en) | Optical laminate and display device | |
| WO2020162102A1 (en) | Optical layered body and display device | |
| CN115335736A (en) | Laminated body | |
| CN113613879A (en) | Laminate and display device | |
| WO2019208167A1 (en) | Optical layered body and method for producing same | |
| CN117280255A (en) | Laminate body | |
| CN117015728A (en) | Laminate body | |
| JP2021152644A (en) | Flexible laminate and image display device having the same | |
| KR20210117941A (en) | Optical laminate and display device | |
| CN113613880A (en) | Laminate and display device | |
| JP2021152645A (en) | Flexible laminate and image display device having the same | |
| KR20240024067A (en) | display device | |
| JP2021152649A (en) | Laminate | |
| CN115335740A (en) | Laminated body | |
| CN113341493A (en) | Optical laminate and display device | |
| CN115349100A (en) | Laminated body |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |