WO2015023153A1 - 점착제 조성물 - Google Patents
점착제 조성물 Download PDFInfo
- Publication number
- WO2015023153A1 WO2015023153A1 PCT/KR2014/007597 KR2014007597W WO2015023153A1 WO 2015023153 A1 WO2015023153 A1 WO 2015023153A1 KR 2014007597 W KR2014007597 W KR 2014007597W WO 2015023153 A1 WO2015023153 A1 WO 2015023153A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensitive adhesive
- pressure
- meth
- group
- weight
- Prior art date
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- 239000000203 mixture Substances 0.000 title claims abstract description 50
- 239000000853 adhesive Substances 0.000 title claims abstract description 14
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 14
- 239000000178 monomer Substances 0.000 claims abstract description 65
- 229920000642 polymer Polymers 0.000 claims abstract description 57
- 125000000524 functional group Chemical group 0.000 claims abstract description 22
- 239000012790 adhesive layer Substances 0.000 claims abstract description 11
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 115
- 239000010410 layer Substances 0.000 claims description 109
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 69
- -1 methoxyethyl Chemical group 0.000 claims description 42
- 125000004432 carbon atom Chemical group C* 0.000 claims description 25
- 239000003431 cross linking reagent Substances 0.000 claims description 23
- 125000000217 alkyl group Chemical group 0.000 claims description 14
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 10
- 239000011521 glass Substances 0.000 claims description 10
- 239000001257 hydrogen Substances 0.000 claims description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 8
- 239000002202 Polyethylene glycol Substances 0.000 claims description 6
- 150000002431 hydrogen Chemical class 0.000 claims description 6
- 239000012948 isocyanate Substances 0.000 claims description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims description 6
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 claims description 5
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical class CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 claims description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 5
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 125000003118 aryl group Chemical group 0.000 claims description 4
- 229920002301 cellulose acetate Polymers 0.000 claims description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 4
- 229920006267 polyester film Polymers 0.000 claims description 4
- WFSMVVDJSNMRAR-UHFFFAOYSA-N 2-[2-(2-ethoxyethoxy)ethoxy]ethanol Chemical compound CCOCCOCCOCCO WFSMVVDJSNMRAR-UHFFFAOYSA-N 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 125000002947 alkylene group Chemical group 0.000 claims description 3
- 125000003368 amide group Chemical group 0.000 claims description 3
- 125000003710 aryl alkyl group Chemical group 0.000 claims description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 3
- 239000013522 chelant Substances 0.000 claims description 3
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 claims description 2
- IGFHQQFPSIBGKE-UHFFFAOYSA-N Nonylphenol Natural products CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 claims description 2
- 239000004952 Polyamide Substances 0.000 claims description 2
- 125000005370 alkoxysilyl group Chemical group 0.000 claims description 2
- 125000003277 amino group Chemical group 0.000 claims description 2
- 229920000847 nonoxynol Polymers 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 2
- 229920006289 polycarbonate film Polymers 0.000 claims description 2
- 229920006290 polyethylene naphthalate film Polymers 0.000 claims description 2
- 229920000098 polyolefin Polymers 0.000 claims description 2
- 229920001451 polypropylene glycol Polymers 0.000 claims description 2
- 229920006264 polyurethane film Polymers 0.000 claims description 2
- 125000003700 epoxy group Chemical group 0.000 claims 1
- 239000000565 sealant Substances 0.000 claims 1
- 239000003792 electrolyte Substances 0.000 abstract description 53
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- 238000007789 sealing Methods 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 description 55
- HFCUBKYHMMPGBY-UHFFFAOYSA-N 2-methoxyethyl prop-2-enoate Chemical compound COCCOC(=O)C=C HFCUBKYHMMPGBY-UHFFFAOYSA-N 0.000 description 29
- NDWUBGAGUCISDV-UHFFFAOYSA-N 4-hydroxybutyl prop-2-enoate Chemical compound OCCCCOC(=O)C=C NDWUBGAGUCISDV-UHFFFAOYSA-N 0.000 description 29
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 15
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- 150000003839 salts Chemical class 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
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- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 150000002513 isocyanates Chemical class 0.000 description 5
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 5
- 238000006116 polymerization reaction Methods 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 4
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- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000005227 gel permeation chromatography Methods 0.000 description 4
- 229910003002 lithium salt Inorganic materials 0.000 description 4
- 159000000002 lithium salts Chemical class 0.000 description 4
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- 230000000704 physical effect Effects 0.000 description 4
- PBKONEOXTCPAFI-UHFFFAOYSA-N 1,2,4-trichlorobenzene Chemical compound ClC1=CC=C(Cl)C(Cl)=C1 PBKONEOXTCPAFI-UHFFFAOYSA-N 0.000 description 3
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
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- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
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- 125000005442 diisocyanate group Chemical group 0.000 description 3
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- 238000002347 injection Methods 0.000 description 3
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- 229910052744 lithium Inorganic materials 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
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- 238000000926 separation method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- GOYDNIKZWGIXJT-UHFFFAOYSA-N 1,2-difluorobenzene Chemical compound FC1=CC=CC=C1F GOYDNIKZWGIXJT-UHFFFAOYSA-N 0.000 description 2
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 2
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- OZJPLYNZGCXSJM-UHFFFAOYSA-N 5-valerolactone Chemical compound O=C1CCCCO1 OZJPLYNZGCXSJM-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- NOWKCMXCCJGMRR-UHFFFAOYSA-N Aziridine Chemical compound C1CN1 NOWKCMXCCJGMRR-UHFFFAOYSA-N 0.000 description 2
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- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
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- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 2
- 125000003545 alkoxy group Chemical group 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
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- 230000000712 assembly Effects 0.000 description 2
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- FFBZKUHRIXKOSY-UHFFFAOYSA-N aziridine-1-carboxamide Chemical compound NC(=O)N1CC1 FFBZKUHRIXKOSY-UHFFFAOYSA-N 0.000 description 2
- 238000012662 bulk polymerization Methods 0.000 description 2
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 description 2
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- 125000004093 cyano group Chemical group *C#N 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 2
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- YADSGOSSYOOKMP-UHFFFAOYSA-N dioxolead Chemical compound O=[Pb]=O YADSGOSSYOOKMP-UHFFFAOYSA-N 0.000 description 2
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- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 description 2
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- 150000002500 ions Chemical class 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
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- 125000004430 oxygen atom Chemical group O* 0.000 description 2
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 2
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- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
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- YOSXAXYCARLZTR-UHFFFAOYSA-N prop-2-enoyl isocyanate Chemical class C=CC(=O)N=C=O YOSXAXYCARLZTR-UHFFFAOYSA-N 0.000 description 2
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- 238000012360 testing method Methods 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
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- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
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- AJKNNUJQFALRIK-UHFFFAOYSA-N 1,2,3-trifluorobenzene Chemical compound FC1=CC=CC(F)=C1F AJKNNUJQFALRIK-UHFFFAOYSA-N 0.000 description 1
- RIWAPWDHHMWTRA-UHFFFAOYSA-N 1,2,3-triiodobenzene Chemical compound IC1=CC=CC(I)=C1I RIWAPWDHHMWTRA-UHFFFAOYSA-N 0.000 description 1
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- KSXFNGRHPAHIQJ-UHFFFAOYSA-N 1,2,4-triiodobenzene Chemical compound IC1=CC=C(I)C(I)=C1 KSXFNGRHPAHIQJ-UHFFFAOYSA-N 0.000 description 1
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- CXKUBSWJMNSYFO-UHFFFAOYSA-N 1,5-dichloro-5-methylcyclohexa-1,3-diene Chemical compound CC1(Cl)CC(Cl)=CC=C1 CXKUBSWJMNSYFO-UHFFFAOYSA-N 0.000 description 1
- PXMUFZLVYDRMJG-UHFFFAOYSA-N 1,5-difluoro-5-methylcyclohexa-1,3-diene Chemical compound CC1(F)CC(F)=CC=C1 PXMUFZLVYDRMJG-UHFFFAOYSA-N 0.000 description 1
- OLXMSYKIKJDKRQ-UHFFFAOYSA-N 1,5-diiodo-5-methylcyclohexa-1,3-diene Chemical compound CC1(I)CC(I)=CC=C1 OLXMSYKIKJDKRQ-UHFFFAOYSA-N 0.000 description 1
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- MMZYCBHLNZVROM-UHFFFAOYSA-N 1-fluoro-2-methylbenzene Chemical compound CC1=CC=CC=C1F MMZYCBHLNZVROM-UHFFFAOYSA-N 0.000 description 1
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- SQAINHDHICKHLX-UHFFFAOYSA-N 1-naphthaldehyde Chemical group C1=CC=C2C(C=O)=CC=CC2=C1 SQAINHDHICKHLX-UHFFFAOYSA-N 0.000 description 1
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- Y02E60/10—Energy storage using batteries
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- Embodiments of the present application relate to an adhesive composition, a seal tape, and a secondary battery.
- the secondary battery is classified into a cylindrical battery and a rectangular battery in which the electrode assembly is embedded in a cylindrical or rectangular metal can, and a pouch type battery in which the electrode assembly is embedded in a pouch type case of an aluminum laminate sheet. do.
- the cylindrical battery is manufactured by fixing the end of a jelly-roll type electrode assembly (hereinafter referred to as “jelly-roll”) with a seal tape including an adhesive layer and then storing the cylindrical battery in a cylindrical metal case.
- jelly-roll a jelly-roll type electrode assembly
- the jelly-roll repeats anisotropic volume expansion and contraction due to the seal tape.
- the anisotropic expansion and contraction is most affected by the outer edge of the jelly-roll, which may cause disconnection of the electrode.
- Embodiments of the present application provide an adhesive composition, a seal tape, and a secondary battery.
- the pressure-sensitive adhesive composition includes a polymer having a polymer unit derived from a (meth) acrylic acid ester monomer, a monomer having a polar functional group, and a crosslinkable monomer containing a crosslinkable functional group.
- the electrode assembly is inserted into the battery can,
- the pressure-sensitive adhesive layer is deformed, for example, swelled or swelled by the presence of the polar functional group of the monomer having the polar functional group present in the pressure-sensitive adhesive layer upon contact with the electrolyte injected into the secondary battery.
- the seal tape forms a three-dimensional solid structure, and the surface of the pressure-sensitive adhesive layer has a surface roughness value of a specific range, thereby reducing the adhesion or peeling force between the electrode assembly and the pressure-sensitive adhesive layer, Since the pressure-sensitive adhesive layer is detached from the electrode assembly, it is possible to induce isotropic volume expansion and contraction of the electrode assembly, thereby preventing disconnection of the electrode.
- the pressure-sensitive adhesive composition includes a polymer having a polymerization unit, and in one example, the polymer polymerizes, for example, a (meth) acrylic acid ester monomer, a monomer having a polar functional group, and a crosslinkable monomer having a crosslinkable functional group. It may be included in the form.
- alkyl (meth) acrylate As the (meth) acrylic acid ester monomer included in the polymer as a polymerization unit, for example, alkyl (meth) acrylate can be used, and in consideration of the cohesive force of the pressure-sensitive adhesive, glass transition temperature, or adhesiveness, the carbon number is 1 Alkyl (meth) acrylate which has an alkyl group of 14 can be used.
- octyl (meth) acrylate, isononyl (meth) acrylate, lauryl (meth) acrylate and tetradecyl (meth) acrylate may be exemplified, but is not limited thereto.
- (meth) acrylate means an acrylate or methacrylate, and the same is also true for other terms in which “(meth)” is used.
- the monomer having a polar functional group is a monomer having excellent affinity with an electrolyte, and the pressure-sensitive adhesive layer prepared by the pressure-sensitive adhesive composition is deformed, for example, swelled or swelled when in contact with the electrolyte, so as to be formed between the electrode assembly and the pressure-sensitive adhesive layer.
- the polymer of the pressure-sensitive adhesive composition is included as a polymer unit.
- the monomer having the polar functional group may be represented by the following formula (1).
- R 1 represents hydrogen or an alkyl group having 1 to 12 carbon atoms
- R 2 represents alkylene having 1 to 6 carbon atoms
- R 3 represents hydrogen, an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 24 carbon atoms, or an arylalkyl group having 6 to 48 carbon atoms,
- n is greater than or equal to zero.
- R 1 is hydrogen, an alkyl group having 1 to 12 carbon atoms, 1 to 8 carbon atoms or 1 to 4 carbon atoms, for example, hydrogen, methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, and the like. This may be exemplified, but preferably hydrogen or methyl, but is not limited thereto.
- R 2 is alkylene having 1 to 6, 1 to 4 or 1 to 2 carbon atoms, for example, ethylene or propylene, but is not limited thereto.
- R 3 is hydrogen, an alkyl group having 1 to 12, 1 to 8, 1 to 6, or 1 to 4 carbon atoms; Aryl groups having 6 to 24 carbon atoms, 6 to 20 carbon atoms, 6 to 18 carbon atoms, or 6 to 12 carbon atoms; Or an arylalkyl group having 6 to 48 carbon atoms, 6 to 30 carbon atoms, 6 to 24 carbon atoms, or 6 to 18 carbon atoms, for example, hydrogen, methyl group, ethyl group, propyl group, phenyl group, naphthal group, butylphenol group, pentylphenol Group, hexylphenol group, heptylphenol group, octylphenol group or nonylphenol group and the like can be exemplified, but is not limited thereto.
- n may be 0 or more, for example, 1 or more, preferably 2 or more.
- the monomer represented by Formula 1 may be a monomer of Formula 2 below.
- R 1 and R 3 are as defined above,
- p is 0-100 and q is 0-100.
- the monomer represented by Formula 1 or Formula 2 includes at least one or more oxygen atoms, and because of the high electronegativity of the oxygen atoms, the monomers have a very high polarity. It has a high affinity with polar electrolytes and can expand upon contact with the electrolytes.
- the term "electrolyte” may mean, for example, an ion conducting medium used in a secondary battery or the like.
- the electrolyte may be an electrolyte that is a liquid medium, but is not limited thereto. In the present specification, the electrolyte may be expressed as an electrolyte.
- the polymer may include 30 parts by weight to 300 parts by weight, for example, 40 to 280 parts by weight or 44 to 250 parts by weight based on 100 parts by weight of the (meth) acrylic acid ester monomer in a polymerized form. May be, but is not limited thereto.
- the monomer represented by Chemical Formula 1 may be included in an amount of 25 to 80 parts by weight, for example, 25 to 75 parts by weight or 30 to 70 parts by weight based on 100 parts by weight of the total monomers included in the polymer as a polymer unit.
- the crosslinkable monomer having the crosslinkable functional group may be copolymerized with the (meth) acrylic acid ester monomer or other monomer included in the polymer, and provide a crosslinking point capable of reacting with the multifunctional crosslinking agent in the main chain of the polymer after copolymerization. It can be a monomer.
- the crosslinkable functional group may be a hydroxyl group, a carboxyl group, an isocyanate group, a glycidyl group, an amide group, or the like, and in some cases, may be a photocrosslinkable functional group such as an acryloyl group or a methacryloyl group.
- a photocrosslinkable functional group it can introduce
- a crosslinkable monomer containing the said hydroxy group For example, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, hydroxyhexyl (meth) acrylate, Monomers containing hydroxy groups such as hydroxyoctyl (meth) acrylate, hydroxyethylene glycol (meth) acrylate, glycerol (meth) acrylate or hydroxypropylene glycol (meth) acrylate can be used.
- carboxyl group-containing monomer for example, (meth) acrylic acid, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, and the like may be used, but are not limited thereto. no.
- crosslinkable monomer containing the glycidyl group for example, epoxycycloalkylalkyl such as glycidyl (meth) acrylate, epoxyalkyl (meth) acrylate or epoxycyclohexylmethyl (meth) acrylate (Meth) acrylate may be used, but is not limited thereto.
- examples of the crosslinkable monomer containing the isocyanate group include 2-isocyanatoethyl (meth) acrylate, 1,1-bis (acryloyloxymethyl) ethyl isocyanate, and (meth) acryloyloxy ethyl isocyanate.
- amide group containing monomer it is (meth) acrylamide, diethyl acrylamide, N-vinylpyrrolidone, N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, for example.
- N, N'-methylenebisacrylamide, N, N-dimethylaminopropylacrylamide, N, N-dimethylaminopropylmethacrylamide, diacetone (meth) acrylamide, and the like may be used, but is not limited thereto. .
- aminoethyl (meth) acrylate for example, aminoethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, and the like can be used. It is not limited.
- alkoxysilyl group-containing monomer trimethoxysilylpropyl (meth) acrylate or allyloxyethyl (meth) acrylate may be used, but is not limited thereto.
- the polymer is 0.1 to 10 parts by weight, for example, 2.5 to 10 parts by weight, 2.9 to 9 parts by weight or 2.9 to 8 parts by weight, based on 100 parts by weight of the (meth) acrylic acid ester monomer in a polymerized form. It may include, but is not limited thereto.
- the crosslinkable monomer may be included in an amount of 0.1 to 5 parts by weight, for example, 0.5 to 3 parts by weight or 1 to 2 parts by weight, based on 100 parts by weight of the total monomers contained in the polymer unit.
- the peeling force may be too low to cause a problem in that the pressure-sensitive adhesive layer is difficult to fix the electrode assembly, and when included too little, the pressure-sensitive adhesive layer may be sufficient to detach from the electrode assembly upon contact with the electrolyte. Since it is difficult to swell as much, in consideration of this point, it is possible to adjust the content of the crosslinkable monomer within the above-mentioned range.
- the polymer may further include other functional comonomers in a polymerized form as necessary, and examples thereof include monomers represented by the following general formula (3).
- R 6 to R 8 each independently represent hydrogen or alkyl, and R 9 represents cyano; Phenyl unsubstituted or substituted with alkyl; Acetyloxy; Or COR 10 , wherein R 10 represents amino or glycidyloxy unsubstituted or substituted with alkyl or alkoxyalkyl.
- Alkyl or alkoxy in the definition of R 6 to R 10 in the above formula means alkyl or alkoxy having 1 to 8 carbon atoms, preferably methyl, ethyl, methoxy, ethoxy, propoxy or butoxy.
- the monomer of Formula 3 include (meth) acrylamide, N-butoxy methyl (meth) acrylamide, N-methyl (meth) acrylamide, (meth) acrylonitrile, N-vinyl pyrrolidone or N Nitrogen-containing monomers such as vinylcaprolactam, styrene-based monomers such as styrene or methyl styrene; Glycidyl (meth) acrylate; Caprolactone, vinyl esters of carboxylic acids such as vinyl acetate, and the like, may be exemplified, but is not limited thereto.
- the polymer may be included in the composition in a form crosslinked by a multifunctional crosslinking agent.
- the pressure-sensitive adhesive layer prepared from the composition may have a property of expanding or swelling upon contact with the electrolyte, thereby preventing disconnection of the electrode.
- the pressure-sensitive adhesive layer prepared from the pressure-sensitive adhesive composition may ensure appropriate cohesion.
- the kind of the polyfunctional crosslinking agent which crosslinks the said polymer is not specifically limited, For example, of the crosslinkable functional group which exists in a polymer in well-known crosslinking agents, such as an isocyanate crosslinking agent, an epoxy crosslinking agent, an aziridine crosslinking agent, a metal chelate crosslinking agent, or a photocrosslinking agent, Depending on the type, an appropriate crosslinking agent may be selected.
- crosslinkable functional group which exists in a polymer in well-known crosslinking agents, such as an isocyanate crosslinking agent, an epoxy crosslinking agent, an aziridine crosslinking agent, a metal chelate crosslinking agent, or a photocrosslinking agent, Depending on the type, an appropriate crosslinking agent may be selected.
- isocyanate crosslinking agent examples include diisocyanates such as tolylene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isoborone diisocyanate, tetramethylxylene diisocyanate or naphthalene diisocyanate, and the above diisocyanate.
- diisocyanates such as tolylene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isoborone diisocyanate, tetramethylxylene diisocyanate or naphthalene diisocyanate, and the above diisocyanate.
- a reactant with a polyol examples include trimethylol propane and the like.
- Epoxy crosslinking agents include ethylene glycol diglycidyl ether, triglycidyl ether, trimethylolpropane triglycidyl ether, N, N, N ', N'-tetraglycidyl ethylenediamine or glycerin diglycidyl ether.
- the aziridine crosslinking agent N, N'-toluene-2,4-bis (1-aziridinecarboxamide), N, N'-diphenylmethane-4,4'-bis (1- Aziridinecarboxamide), triethylene melamine, bisisoprotaloyl-1- (2-methylaziridine) or tri-1-aziridinylphosphine oxide, and the like.
- Examples of the metal chelate crosslinking agent include acetyl.
- Examples of the compound in which a polyvalent metal is coordinated with a compound such as acetone or ethyl acetoacetate may be mentioned.
- Examples of the polyvalent metal include aluminum, iron, zinc, tin, titanium, antimony, magnesium, vanadium, and the like. Polyfunctional acrylate and the like can be used. In consideration of the kind of crosslinkable functional groups contained in the polymer, one or two or more crosslinking agents may be used.
- the weight ratio of the multifunctional crosslinking agent in the pressure-sensitive adhesive composition can be adjusted to a range in which the desired peel force or the gel fraction described later can be secured.
- the crosslinking agent may be included in an amount of 0.001 to 10 parts by weight, for example, 0.1 to 5 parts by weight or 0.5 to 4 parts by weight based on 100 parts by weight of the total composition, but is not limited thereto. If the ratio of the multifunctional crosslinking agent is too small, the cohesive force of the pressure-sensitive adhesive layer is not properly secured, and if it is too high, the adhesive physical properties may be deteriorated, so a suitable range may be selected in consideration of this.
- the polymer included in the pressure-sensitive adhesive composition is a mixture of the monomers as described above (solution polymerization), photopolymerization (photo polymerization), bulk polymerization (bulk polymerization), suspension polymerization (suspension polymerization) or emulsion polymerization (emulsion polymerization) It can manufacture by applying to the same polymerization process.
- the polymer has a weight average molecular weight (Mw) of 300,000 to 2.5 million, 400,000 to 2 million, 400,000 to 1.5 million, 400,000 to 1 million, 500,000 to 2 million, 800,000 to 1.8 million , 600,000 to 1.2 million, 700,000 to 1.4 million, or about 600,000 to 800,000.
- Mw weight average molecular weight
- the weight average molecular weight may mean a conversion value for standard polystyrene measured by gel permeation chromatography (GPC), and unless otherwise specified, molecular weight may mean weight average molecular weight. If the molecular weight of the polymer is too low, the cohesion of the pressure-sensitive adhesive layer may be lowered, if it is too high, the adhesive physical properties may be lowered, an appropriate molecular weight may be selected in consideration of this point.
- the pressure-sensitive adhesive composition may further include various additives known in the art as needed.
- the pressure-sensitive adhesive composition may further include a tackifier.
- a tackifier for example, a rosin ester or styrene tackifier may be used, but is not limited thereto, and an appropriate kind may be selected and used as necessary.
- the content of the tackifier is also not particularly limited, and may be adjusted in consideration of peeling force with the electrode assembly.
- the tackifier may be used in a ratio of 1 part by weight to 25 parts by weight with respect to 100 parts by weight of the polymer.
- the pressure-sensitive adhesive composition may also include an initiator such as a thermal initiator or a photoinitiator in a range that does not affect the desired effect; Epoxy resins; Curing agent; Ultraviolet stabilizers; Antioxidants; Colorant; Adjuvant; Fillers; Antifoam; Surfactants; Photopolymerizable compounds such as polyfunctional acrylates; Or additives such as plasticizers and the like.
- an initiator such as a thermal initiator or a photoinitiator in a range that does not affect the desired effect
- Epoxy resins Curing agent; Ultraviolet stabilizers; Antioxidants; Colorant; Adjuvant; Fillers; Antifoam; Surfactants; Photopolymerizable compounds such as polyfunctional acrylates; Or additives such as plasticizers and the like.
- the polymer included in the pressure-sensitive adhesive composition may be prepared by photopolymerization by selecting a suitable photoinitiator, which is generally well known.
- the photoinitiator is, for example, benzoyl peroxide, 1,1-bis (tert-butylperoxy) -3,3,5-triethylcyclohexane, tert-butyl peroxy acetate, tert-butyl peroxy benzoate , Tert-butyl peroxy-2-ethylhexanoate, tert-butyl peroxy isopropyl carbonate, di-2-ethylhexyl peroxy dicarbonate, di-isopropyl peroxy dicarbonate, di-3-methoxybutyl per Organic peroxides such as oxy dicarbonate, di-3,3,5-trimethylhexanoyl peroxide, di-tertiary-butyl peroxide, lauroyl peroxide, dicumyl peroxide
- the content of the photoinitiator is not particularly limited, but may be included in an amount of 0.01 to 5 parts by weight, for example, 0.01 to 1 part by weight and 0.01 to 0.5 part by weight based on 100 parts by weight of the total monomer mixture.
- seal tape for fixing an electrode assembly.
- the seal tape is attached to the electrode assembly via the above-described pressure-sensitive adhesive layer, and in the case of the secondary battery manufactured by inserting the electrode assembly into the battery can, when the pressure-sensitive adhesive layer is in contact with the electrolyte solution Absorbs and expands the electrolyte to form a three-dimensional solid structure, and the surface of the pressure-sensitive adhesive layer has a surface roughness value in a specific range. Accordingly, since the adhesive force or peeling force between the electrode assembly and the pressure-sensitive adhesive layer is reduced, the pressure-sensitive adhesive layer is detached from the electrode assembly, thereby inducing isotropic volume expansion and contraction of the electrode assembly, thereby preventing disconnection of the electrode. have.
- FIG. 1 is a diagram showing a cross section of the seal tape 10 by way of example.
- the seal tape 10 includes a substrate layer 12 and an adhesive layer 11 formed on one surface of the substrate layer 12, and the adhesive layer 11 includes the adhesive composition described above. It contains the hardened
- the base layer 12 may be, for example, one or more films selected from the group consisting of acrylic films, polyolefin films, polyamide films, polycarbonate films, polyurethane films, cellulose acetate films, and polyester films, but It is not limited.
- the base layer 12 when using a polyester film, one or more films selected from the group consisting of polyethylene terephthalate film, polyethylene naphthalate film and polybutylene terephthalate film can be used, and the base layer
- the cellulose base layer 12 is used as (12)
- the mixture containing the resin is extruded or cast as the base layer 12 containing cellulose acetate resin or cellulose alkylate resin.
- the substrate layer 12 manufactured by applying to a process can be used.
- the cellulose alkylate for example, cellulose acetate propionate or cellulose acetate butylate may be used.
- the method of manufacturing the base material layer 12 using the resin is not particularly limited, and for example, a conventional film or sheet molding method such as extrusion or casting of a raw material containing the resin and a known additive as necessary. Can be used.
- the thickness of the base layer 12 is not particularly limited. For example, 10 to 200 ⁇ m, 10 to 100 ⁇ m, 10 to 50 ⁇ m, 15 To 30 ⁇ m or 15 to 20 ⁇ m.
- the pressure-sensitive adhesive layer 11 may include a cured product of the pressure-sensitive adhesive composition described above, and may include a polymer included in the pressure-sensitive adhesive composition in a crosslinked form. Description of the pressure-sensitive adhesive composition is the same bar as described above will be omitted.
- the pressure-sensitive adhesive layer 11 as described above may, for example, coat a coating solution containing a polymer and a multifunctional crosslinking agent on the base layer 12, and perform crosslinking reaction of the polymer and the multifunctional crosslinking agent under appropriate conditions. Can be formed by induction.
- the thickness of the pressure-sensitive adhesive layer 11 may be appropriately selected depending on the application to be applied, for example, a desired peel force, and the like, and is not particularly limited.
- the pressure-sensitive adhesive layer 11 may be, for example, 2 ⁇ m to 100 ⁇ m, 3 ⁇ m to 50 ⁇ m, 4 ⁇ m to 25 ⁇ m, 2 ⁇ m to 15 ⁇ m, 4 ⁇ m to 10 ⁇ m, 4 ⁇ m to 9 ⁇ m, and 4 ⁇ m. It may be formed to have a thickness of about 7 to 7 ⁇ m, 5 ⁇ m to 9 ⁇ m or 5 ⁇ m to 7 ⁇ m, it can be changed according to the purpose.
- the seal tape 10 may be a seal tape 10 attached to an outer circumferential surface of the electrode assembly in the secondary battery.
- the seal tape 10 according to the embodiments of the present application is not excessively high in the initial peeling force of the pressure-sensitive adhesive layer 11, by including the pressure-sensitive adhesive layer 11 containing the monomer having a polar functional group, When the seal tape 10 is in contact with the electrolyte in the secondary battery, the pressure-sensitive adhesive layer 11 absorbs and expands the electrolyte, thereby adjusting the peeling force of the pressure-sensitive adhesive layer 11 low enough to detach from the electrode assembly. Can be.
- the seal tape 10 of the present application may have an initial peel force sufficient to fix the electrode assembly and to detach it from the electrode assembly upon contact with an electrolyte. If the initial peel force of the electrode assembly is too high, it may be difficult to detach from the electrode assembly 22 even after the pressure-sensitive adhesive layer 11 is in contact with the electrolyte.
- the pressure-sensitive adhesive layer 11 has a peel force of 370 gf / 25mm or less, for example, 350 gf / 25mm, at room temperature measured at a peel rate of 5 mm / sec and a peel angle of 180 degrees with respect to glass. Or less than 315 gf / 25 mm or less than or equal to 312 gf / 25 mm.
- the lower limit of the peeling force of the pressure-sensitive adhesive layer 11 on the glass is not particularly limited.
- the pressure-sensitive adhesive layer has a very low initial peeling force
- the pressure-sensitive adhesive layer loses the adhesive force upon contact with the electrolyte solution.
- the seal tape is detached from the electrode assembly, thereby preventing disconnection of the electrode.
- the lower limit of the peel force on the glass is 5 gf / 25mm or more, for example, 10 gf / 25mm or more, 20 gf / 25mm or more, 30 gf / 25mm or more, 40 gf / 25mm or more, 50 gf / 25mm or more, It can be adjusted to 60 gf / 25mm or more, 70 gf / 25mm or more, 80 gf / 25mm or more, 85 gf / 25mm or more or 88 gf / 25mm or more.
- the pressure-sensitive adhesive layer 11 has a peeling force in the above range with respect to glass, even when the pressure-sensitive adhesive layer 11 is attached to the outer peripheral surface of the electrode assembly, suitable initial peeling for detaching upon contact with the electrolyte solution Force, and when the seal tape 10 is in contact with the electrolyte, a three-dimensional structure having a specific surface roughness may be formed.
- the outer circumferential surface of the electrode assembly may be, for example, a separator or glass laminated on the separator.
- the seal tape 10 of the present application forms a three-dimensional structure by absorbing and expanding the pressure-sensitive adhesive layer 11 when in contact with the electrolyte, and the peeling force of the pressure-sensitive adhesive layer 11 from the electrode assembly.
- the adhesive layer 11 may be detached from the outer circumferential surface of the electrode assembly.
- the seal tape 10 may be detached from the outer circumferential surface of the electrode assembly after contact with an electrolyte solution, and preferably, the seal tape 10 may be attached to the outer circumferential surface of the electrode assembly. At least 50%, for example at least 60%, at least 70% or at least 80% may be desorbed.
- the seal tape 10 may absorb and expand the electrolyte after contact with the electrolyte to form a three-dimensional solid structure.
- the pressure-sensitive adhesive layer 11 may expand in the thickness direction and / or the longitudinal direction of the pressure-sensitive adhesive layer 11 when in contact with an electrolyte solution, thereby forming a three-dimensional structure.
- the "stereoscopic structure" of the seal tape 10 is formed through the action of the expansion force of the pressure-sensitive adhesive layer 11 of the seal tape 10 in contact with the electrolyte and the peel force of the base layer 12, the pressure-sensitive adhesive It can be a concept that includes all structures that can allow layer 11 to be detached from the electrode assembly.
- the three-dimensional structure may include a plurality of protruding shapes in a direction perpendicular to the longitudinal direction of the pressure-sensitive adhesive layer.
- the “length direction” may mean a direction perpendicular to the thickness direction of the pressure sensitive adhesive layer when the pressure sensitive adhesive layer is kept flat.
- said “vertical” or “horizontal” means substantially vertical or horizontal in the range which does not impair the desired effect, For example, the error of about ⁇ 10 degrees, ⁇ 5 degrees, or ⁇ 3 degrees It may include.
- the center line average roughness Ra of the surface of the pressure-sensitive adhesive layer forming a three-dimensional structure including a plurality of protruding shapes after contact with the electrolyte as described above is 100 to 250 ⁇ m, for example, 150 to 240 ⁇ m or 155 to 230 ⁇ m. Can be.
- the center line average roughness Ra may be a value measured after 24 hours from the point of contact with the electrolyte.
- the centerline average roughness may be measured under the standard of ASTM D4417 or may be obtained as defined in JIS B0031 or JIS B0601.
- the thickness of the seal tape 10 may be appropriately selected depending on the desired peeling force and the like, and is not particularly limited.
- the seal tape 10 has a thickness of, for example, 10 ⁇ m to 100 ⁇ m, 15 ⁇ m to 75 ⁇ m, 20 ⁇ m to 45 ⁇ m, 15 ⁇ m to 40 ⁇ m, 20 ⁇ m to 40 ⁇ m, and 20 ⁇ m to 30 ⁇ m. It may be formed to have, but may be changed according to the purpose. If the thickness of the seal tape 10 is too thin, the effect of the expansion of the pressure-sensitive adhesive layer 11 of the seal tape 10 may be difficult to be exerted. On the contrary, if the thickness is too thick, the thickness of the electrode assembly is increased. Increasingly, when the battery case is inserted into the battery case, damage of the electrode assembly due to deterioration of processability may be large or capacity may be reduced at the same size.
- the seal tape 10 may further include a release sheet attached to the pressure-sensitive adhesive layer 11 to protect the pressure-sensitive adhesive layer 11 before use of the tape.
- Another embodiment of the present application provides a secondary battery.
- FIG. 2 is a diagram schematically showing an exemplary secondary battery of the present application.
- the secondary battery 20 has a seal tape 10 attached to the electrode assembly 22 and the outer circumferential surface of the electrode assembly 22 via the pressure-sensitive adhesive layer 11, as shown in FIG. 2. It includes. The description about the said seal tape 10 and the adhesive layer 11 is the same as that mentioned above, and abbreviate
- the seal tape 10 is fixed to the electrode assembly 22 through the pressure-sensitive adhesive layer 11 formed on the base layer 12 as described above. As the seal tape 10 is in contact with the electrolyte and expands, the peeling force with the electrode assembly 22 is reduced, whereby the pressure-sensitive adhesive layer 11 can be detached or detached from the electrode assembly 22. .
- the pressure-sensitive adhesive layer 11 may be designed to have an appropriate initial peel force so that the pressure-sensitive adhesive layer 11 is detached or detached from the electrode assembly 22 when the pressure-sensitive adhesive layer 11 is in contact with the electrolyte. For example, if the initial peeling force of the electrode assembly is too high, it may be difficult to detach from the electrode assembly 22 even after the pressure-sensitive adhesive layer 11 is in contact with the electrolyte.
- the peeling force with respect to the electrode assembly at normal temperature measured at the peeling speed of 5 mm / sec and the peeling angle of 180 degree of the said adhesive layer for example, 1200 gf / 25mm or less, 1000 gf / 25mm or less, 900 gf / 25mm Or less, 800 gf / 25 mm or less, 700 gf / 25 mm or less, or 600 gf / 25 mm or less.
- the lower limit of the peeling force of the pressure-sensitive adhesive layer 11 with respect to the electrode assembly is not particularly limited. For example, when the pressure-sensitive adhesive layer has a very low initial peeling force, the pressure-sensitive adhesive layer loses the adhesive force upon contact with the electrolyte solution.
- the seal tape is detached from the electrode assembly, whereby disconnection of the electrode can be prevented.
- the electrode assembly may be released in a state of not being in contact with the electrolyte before being accommodated in the can, and in view of this, the pressure-sensitive adhesive layer 11
- the lower limit of peeling force of 5 gf / 25mm, 10 gf / 25mm or more, 20 gf / 25mm or more, 25 gf / 25mm or more, 45 gf / 25mm or more, 65 gf / 25mm or more, 70 gf / 25mm or more, 80 gf / 25mm or more, 85 gf / 25mm or more, or 90gf / 25mm or more can be adjusted.
- the peeling force may be, for example, a peeling force on the separator.
- the pressure-sensitive adhesive layer 11 has a peel force of the above range with respect to the electrode assembly or the separator, even when the pressure-sensitive adhesive layer 11 is attached to the outer circumferential surface of the electrode assembly, the pressure-sensitive adhesive layer 11 is to be detached upon contact with the electrolyte solution. Appropriate initial peel force can be exhibited, and when the seal tape 10 is in contact with the electrolyte, it can be efficiently detached from the electrode assembly by forming a three-dimensional structure having a specific surface roughness.
- the pressure-sensitive adhesive layer 11 may react with the electrolyte solution to reduce the peeling force between the pressure-sensitive adhesive layer 11 and the electrode assembly 22, and as the peeling force is lowered, the pressure-sensitive adhesive layer 11 may be detached from the electrode assembly 22 as described above. Can be. As described above, since the seal tape 10 is detached from the electrode assembly 22, the isotropic volume expansion and contraction of the electrode assembly 22 may be induced, and disconnection of the electrode may be improved.
- the pressure-sensitive adhesive layer 11 of the seal tape 10 may be expanded to form a three-dimensional structure after contact with the electrolyte.
- the secondary battery 20 is, for example, after attaching the seal tape 10 to the electrode assembly 22, stored in the can 21, injecting electrolyte into the can 21, and then can ( 21) in a sealed manner.
- the electrode assembly 22 is not particularly limited, and all general assemblies used in the art may be included.
- the electrode assembly 22 may be a secondary battery 20, for example, an electrode assembly 22 for a lithium secondary battery.
- the electrode assembly 22 is a positive electrode plate; And a separator interposed between the negative electrode plate and the positive electrode plate and the negative electrode plate, wherein the seal tape may be attached to an outer circumferential surface of the electrode assembly 22 via the pressure-sensitive adhesive layer 11.
- the electrode assembly 22 may be wound in a jellyroll shape.
- the positive electrode plate is a positive electrode current collector composed of a thin metal plate or the like excellent in conductivity; And a cathode active material layer coated on the surface of the cathode current collector.
- both ends of the positive electrode plate may be provided with regions in which the positive electrode active material is not coated, and positive electrode tabs protruding to a predetermined length to the upper or lower portion of the electrode assembly 22 may be attached to the regions.
- the positive electrode tab may serve to electrically connect the electrode assembly 22 and another portion of the battery.
- the negative electrode plate the negative electrode current collector composed of a conductive metal thin plate or the like; And a negative electrode active material layer coated on a surface of the negative electrode current collector.
- both ends of the negative electrode plate are formed with regions in which the negative electrode active material layer is not coated, and the regions protrude to a predetermined length to the upper or lower portion of the electrode assembly 22, and the electrode assembly 22 is formed.
- a negative electrode tab to electrically connect the other parts of the battery.
- the electrode assembly 22 is to prevent contact with the cap assembly or the cylindrical can 21, and may further include an insulating plate formed on the upper and / or lower portion.
- the seal tape 10 may be attached to surround the outer circumferential surface, including a finish portion at which the outermost end of the separation membrane of the outer circumferential surface of the electrode assembly 22 is positioned.
- the seal tape 10 may be attached to cover at least 30% or more of the total area of the outer circumferential surface of the electrode assembly 22, and the upper and lower portions of the outer circumferential surface of the electrode assembly 22 are exposed as it is. It may be attached as possible.
- the kind of the can 21 in which the electrode assembly 22 is accommodated is not particularly limited.
- a cylindrical can 21 may be exemplified as a type known in the art.
- transforms, for example, expands the adhesive layer 11 of the seal tape 10 is not specifically limited,
- the well-known electrolyte solution of this field is used according to the kind of battery.
- the electrolyte may include, for example, a non-aqueous organic solvent and a lithium salt.
- the lithium salt may be dissolved in an organic solvent to serve as a source of lithium ions in the battery and to promote the movement of lithium ions between the positive electrode and the negative electrode.
- lithium salts examples include LiPF 6 , LiBF 4 , LiSbF 6 , LiAsF 6 , LiCF 3 SO 3 , LiN (CF 3 SO 2 ) 3 , Li (CF 3 SO 2 ) 2 N, LiC 4 F 9 SO 3 , LiClO 4 , LiAlO 4 , LiAlCl 4 , LiN (C x F 2x + 1SO 2 ) (C y F2 y + 1SO 2 ), where x and y are natural water, LiCl, LiI, and lithium bisoxalate borate It is mentioned to include a kind or two or more kinds of) as a supporting electrolytic salt.
- the concentration of lithium salt in the electrolyte which can vary depending on the application, is typically used within the range of 0.1M to 2.0M.
- the organic solvent serves as a medium through which ions involved in the electrochemical reaction of the battery can move, and examples thereof include benzene, toluene, fluorobenzene, 1,2-difluorobenzene, and 1,3.
- the length of the seal tape 10 may be manufactured in a size of 50 to 90% based on the length of the outer circumferential surface of the electrode assembly 22, preferably in a size of 60 to 80%. Can be.
- the seal tape 10 is attached to surround the outer circumferential surface of the electrode assembly 22, the length thereof is preferably made of a length that minimizes the occupied space in the battery.
- the length of the seal tape 10 is too short, it may be difficult to expect a desired effect because the buffering effect and the frictional force increase of the gelled seal tape 10 with respect to the inner surface of the battery can 21 are not large.
- the seal tape 10 is too long, the occupied space inside the battery can 21 becomes larger than necessary, which may cause a decrease in capacity in the same battery can 21 standard, which is not preferable.
- the secondary battery 20 may be a cylindrical lithium ion secondary battery, and the cylindrical secondary battery may have high cost efficiency and large capacitance.
- the pressure-sensitive adhesive composition of the present application provides a seal tape for attaching an electrode assembly that can be detached from the electrode assembly by expanding in contact with an electrolyte solution, thereby inducing isotropic volume expansion and contraction of the electrode assembly during repeated charging and discharging of the secondary battery. This can improve the disconnection phenomenon of breaking the electrode.
- FIG. 1 is a diagram schematically showing a cross section of an exemplary seal tape of the present application.
- FIG. 2 is a diagram schematically showing an exemplary secondary battery of the present application.
- Example 3 is a photograph of a three-dimensional structure formed after contacting the seal tape of Example 1 of the present application with an electrolyte.
- Example 5 is a photograph of a cross section of a three-dimensional structure formed after the seal tape of Example 4 of the present application is contacted with an electrolyte.
- FIG. 6 is a photograph of a cross section of the seal tape after contacting the seal tape of Comparative Example 1 of the present application with an electrolyte.
- Example 7 is a surface roughness graph obtained by mathematically modeling a cross section of a three-dimensional structure formed after contacting the seal tape of Example 4 of the present application with an electrolyte.
- the weight average molecular weight of the adhesive composition was measured under the following conditions using GPC. The measurement result was converted into the calibration curve using standard polystyrene of Agilent system.
- the test piece was prepared by cutting the seal tape to have a length of 25 mm and a length of 200 mm.
- the specimen was attached to the glass plate using a pressure-sensitive adhesive layer using a 2 kg rubber roller, stored at room temperature for about 2 hours, and then a tensile tester was used to seal the tape at a peel rate of 5 mm / sec and a peel angle of 180 degrees. Peeling force was measured while peeling.
- the test piece was prepared by cutting the seal tape to have a length of 25 mm and a length of 200 mm.
- the specimen was attached to the separator (SRS olefin separator) of the electrode assembly using the pressure-sensitive adhesive layer using a 2 kg rubber roller, stored at room temperature for 2 hours, and then peeled at 5 mm / sec using a tensile tester. And peeling force was measured while peeling off the seal tape at a peeling angle of 180 degrees. When the peel force was exceeded when 400 gf / 25mm, the membrane itself was broken while being separated into layers, and thus the peel force could not be measured.
- the specimens prepared in Examples and Comparative Examples were impregnated in a carbonate-based electrolyte, left for one day at room temperature in a sealed state, taken out of the electrolyte, and photographed on a surface by using a digital camera, which is shown in FIGS. 3 and 4. It was.
- the surface shape of the seal tape was observed to evaluate whether or not a three-dimensional structure was generated according to the following criteria.
- ⁇ The three-dimensional structure is clearly observed and can be confirmed with the naked eye.
- Example 4 The specimens prepared in Example 4 and Comparative Example 1 were impregnated in a carbonate-based electrolyte, and left for one day at room temperature in a sealed state, and then taken out of the electrolyte and photographed in cross-sectional shape of the specimen using an optical microscope. 5 and FIG. 6.
- Example 4 as the pressure-sensitive adhesive layer absorbed the electrolyte solution to form a three-dimensional structure, the interface with the transparent PET substrate was clearly observed because the pressure-sensitive adhesive layer had a constant haze, but in Comparative Example 1, the pressure-sensitive adhesive layer hardly absorbed the electrolyte solution. As a result, it was difficult to visually observe the interface between the transparent pressure-sensitive adhesive layer and the PET substrate by not having a haze.
- the seal tape specimens prepared in Examples and Comparative Examples were attached to an electrode assembly (length 60 mm x diameter 17 mm), and the electrode tape was immersed in the carbonate electrolyte, and then the seal tape was The phenomenon of detachment from the surface of the electrode assembly was observed, the area to be detached was calculated by measuring the length of the horizontal and vertical, and the ratio of the detached area to the area (625 mm 2 ) attached to the electrode assembly was calculated.
- the seal tape specimens prepared in Examples and Comparative Examples were attached to an electrode assembly, the electrode assembly was inserted into an outer can, and after injecting electrolyte into the outer can, the outer can was sealed to form a cylindrical battery. After preparing four cylindrical battery samples prepared as described above, for each sample, the charge and discharge was repeated 10 times, and the battery was disassembled, the electrode assembly was taken out, and the crack was generated while removing the anode / separation membrane / cathode / separation membrane. Was observed. same
- n-butyl acrylate n-BA
- MEA Methoxy Ethyl Acrylate
- a monomer mixture consisting of 40 parts by weight and 2 parts by weight of hydroxybutyl acrylate (HBA) and 0.02 parts by weight of n-dodecanethiol, a chain transfer agent, were added, and ethyl acetate (Ethyl Acetate) was used as a solvent.
- EAc 150 parts by weight was added. Then, after purging the nitrogen gas for 60 minutes at 60 outside to remove oxygen, it was kept at 60 outside.
- Preparation Example 1 In Preparation Example 1 except that 58 parts by weight of n-BA, 40 parts by weight of MEA and 2 parts by weight of HBA, 38 parts by weight of n-BA, 60 parts by weight of MEA and 2 parts by weight of HBA were added, Preparation Example 1 In the same manner as the polymer (A6) having a weight average molecular weight of 750,000 was prepared. In the above parts by weight means wt%.
- Preparation Example 1 In the same manner as the weight average molecular weight 730,000 polymer (A7) was prepared. In the above parts by weight means wt%.
- Preparation Example 1 except that methoxy ethyl acrylate was not added, and a monomer mixture consisting of 98 parts by weight of n-butyl acrylate and 2 parts by weight of hydroxybutyl acrylate was added thereto, Preparation Example 1 and In the same manner, a polymer (B1) having a weight average molecular weight of 800,000 was prepared. In the above parts by weight means wt%.
- Preparation Example 1 except that methoxy ethyl acrylate was not added, and the monomer mixture consisting of 93 parts by weight of n-butyl acrylate, and 7 parts by weight of acrylic acid was added, the weight in the same manner as in Preparation Example 1 A polymer (B2) having an average molecular weight of 800,000 was prepared. In the above parts by weight means wt%.
- Preparation Example 1 except that 58 parts by weight of n-BA, 40 parts by weight of MEA and 2 parts by weight of HBA, 88 parts by weight of n-BA, 10 parts by weight of MEA and 2 parts by weight of HBA were added. In the same manner as the weight average molecular weight 790,000 polymer (B3) was prepared. In the above parts by weight means wt%.
- the pressure-sensitive adhesive composition prepared in Preparation Example 1 was coated and dried on one surface of a poly (ethylene terephthalate) PET film (thickness: 19 ⁇ m) to form a uniform coating layer having a thickness of 6 ⁇ m. Then, the release film was laminated on the coating layer, and then aged at constant temperature (25 face) constant humidity for 3 days to prepare a seal tape.
- a poly (ethylene terephthalate) PET film thickness: 19 ⁇ m
- a seal tape is attached to cover approximately 50% of the outer circumference of the jellyroll-shaped electrode assembly (section diameter: 17.2 mm) including the cathode, anode, and separator, and the assembly is placed in a cylindrical can (section diameter: 17.5 mm). ) Is inserted. Subsequently, a carbonate-based electrolyte was injected into the can and sealed to complete the battery.
- the composition of the pressure-sensitive adhesive layer was changed as shown in Tables 1 and 2, and a seal tape and a battery were prepared in the same manner as in Example 1.
- the composition of the pressure-sensitive adhesive layer was changed as shown in Tables 1 and 2, and a seal tape and a battery were prepared in the same manner as in Example 1.
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Abstract
Description
실시예 | |||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | |||
기재층 | 종류 | PET | PET | PET | PET | PET | PET | PET | |
두께 | 19 ㎛ | 19 ㎛ | 19 ㎛ | 19 ㎛ | 19 ㎛ | 19 ㎛ | 19 ㎛ | ||
점착제층 | 아크릴 공중합체 | 아크릴 공중합체 | 제조예 1 (A1) | 제조예 1 (A1) | 제조예 1 (A1) | 제조예 1 (A1) | 제조예 1 (A1) | 제조예 2 (A2) | 제조예 3 (A 3) |
조성 | BA/MEA/HBA=58/40/2 | BA/MEA/HBA=58/40/2 | BA/MEA/HBA=58/40/2 | BA/MEA/HBA=58/40/2 | BA/MEA/HBA=58/40/2 | BA/MOEOEA/HBA=58/40/2 | BA/EOEOEA/HBA=58/40/2 | ||
분자량 | 80만 | 80만 | 80만 | 80만 | 80만 | 70만 | 60만 | ||
이소시아네이트 경화제(중량부 | 0.5 | 1 | 1.5 | 2 | 4 | 2 | 2 | ||
두께 | 6 ㎛ | 6 ㎛ | 6 ㎛ | 6 ㎛ | 6 ㎛ | 6 ㎛ | 6 ㎛ |
실시예 | 비교예 | |||||||||
8 | 9 | 10 | 11 | 1 | 2 | 3 | 4 | |||
기재층 | 종류 | PET | PET | PET | PET | PET | PET | PET | PET | |
두께 | 19 ㎛ | 19 ㎛ | 19 ㎛ | 19 ㎛ | 19 ㎛ | 19 ㎛ | 19 ㎛ | 19 ㎛ | ||
점착제층 | 아크릴 공중합체 | 아크릴 공중합체 | 제조예 4 (A4) | 제조예 5 (A5) | 제조예 6 (A6) | 제조예 7 (A7) | 제조예 8 (B1) | 제조예 9 (B2) | 제조예 10 (B3) | 제조예 11 (B4) |
조성 | BA/MEA/HBA=68/30/2 | BA/MEA/HBA=48/50/2 | BA/MEA/HBA=38/60/2 | BA/MEA/HBA=28/70/2 | BA/HBA=98/2 | BA/AA=93/7 | BA/MEA/HBA=88/10/2 | BA/MEA/HBA=78/20/2 | ||
분자량 | 78만 | 79만 | 75만 | 73만 | 80만 | 80만 | 79만 | 80만 | ||
이소시아네이트 경화제(중량부 | 2 | 2 | 2 | 2 | 2 | 1 | 2 | 2 | ||
두께 | 6 ㎛ | 6 ㎛ | 6 ㎛ | 6 ㎛ | 6 ㎛ | 6 ㎛ | 6 ㎛ | 6 ㎛ |
실시예 | |||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | |
유리에 대한 박리력 (gf/25mm) | 312 | 274 | 236 | 182 | 172 | 221 | 197 |
분리막에 대한 박리력 (gf/25mm) | 400 이상(분리막이 층분리됨) | 400 이상(분리막이 층분리됨) | 400 이상(분리막이 층분리됨) | 93 | 29 | 102 | 96 |
전해액 주입 후 탈리 현상 (탈리된 면적/부착된 면적 x100) | ○(50%) | ○(70%) | ○(100%) | ○(100%) | ○(100%) | ○(100%) | ○(100%) |
전해액 함침 후 입체 구조 형성 여부 | ○ | ○ | ○ | ○ | ○ | ○ | ○ |
입체 구조의 중심선 평균 거칠기 Ra(㎛) | 193 | 186 | 177 | 195 | 198 | 201 | 213 |
전지 성능평가 | 4개 중 1개 크랙 발생 | 4개 중 1개 크랙 발생 | 크랙 없음 | 크랙 없음 | 크랙 없음 | 크랙 없음 | 크랙 없음 |
실시예 | 비교예 | |||||||
8 | 9 | 10 | 11 | 1 | 2 | 3 | 4 | |
유리에 대한 박리력 (gf/25mm) | 88 | 183 | 195 | 205 | 58 | 374 | 44 | 67 |
분리막에 대한 박리력 (gf/25mm) | 99 | 150 | 179 | 188 | 52 | 400 이상(분리막이 층분리됨) | 47 | 61 |
전해액 주입 후 탈리 현상 (탈리된 면적/부착된 면적 x100) | ○(100%) | ○(100%) | ○(100%) | ○(100%) | × | × | × | × |
전해액 함침 후 입체 구조 형성 여부 | ○ | ○ | ○ | ○ | × | × | × | △ |
입체 구조의 중심선 평균 거칠기 Ra(㎛) | 156 | 196 | 227 | 230 | 1.4 | 1.3 | 3.7 | 68 |
전지 성능평가 | 크랙 없음 | 크랙 없음 | 크랙 없음 | 크랙 없음 | 4개 중 4개 크랙 발생 | 4개 중 4개 크랙 발생 | 4개 중 4개 크랙 발생 | 4개 중 2개 크랙 발생 |
Claims (19)
- 제 1 항에 있어서, 화학식 1로 표시되는 단량체는 메톡시에틸 (메타)아크릴레이트, 메톡시에톡시에틸 (메타)아크릴레이트, 에톡시에톡시에틸 (메타)아크릴레이트, 에톡시트리에틸렌글리콜 (메타)아크릴레이트, 폴리에틸렌글리콜 (메타)아크릴레이트, 폴리에틸렌글리콜메틸에테르 (메타)아크릴레이트, 에톡시레이티드노닐페놀 (메타)아크릴레이트, 프로폭시레이티드노닐페놀 (메타)아크릴레이트, 에톡시레이티드페놀 (메타)아크릴레이트, 및 폴리프로필렌글리콜 (메타)아크릴레이트로 이루어진 군으로부터 선택된 1종 이상인 점착제 조성물.
- 제 1 항에 있어서, 중합체는 (메타)아크릴산 에스테르 단량체 100 중량부에 대하여 화학식 1로 표시되는 단량체 30 중량부 내지 300 중량부를 중합된 형태로 포함하는 점착제 조성물.
- 제 1 항에 있어서, 가교성 단량체는 히드록시기, 카르복실기, 에폭시기, 글리시딜기, 이소시아네이트기, 아마이드기, 아미노기 및 알콕시실릴기로 이루어진 군으로부터 선택된 1종 이상의 가교성 관능기를 포함하는 점착제 조성물.
- 제 1 항에 있어서, 중합체는 (메타)아크릴산 에스테르 단량체 100 중량부에 대하여 가교성 단량체 0.1 중량부 내지 10 중량부를 중합된 형태로 포함하는 점착제 조성물.
- 제 1 항에 있어서, 가교제를 추가로 포함하는 점착제 조성물.
- 제 7 항에 있어서, 가교제는 전체 조성물 100 중량부에 대하여 0.001 내지 10 중량부의 함량으로 포함되는 점착제 조성물.
- 제 7 항에 있어서, 가교제는 이소시아네이트계 화합물, 에폭시계 화합물, 아지리딘계 화합물 및 금속 킬레이트계 화합물로 이루어진 군으로부터 군으로부터 선택된 1종 이상을 포함하는 점착제 조성물.
- 기재층; 및 상기 기재층의 일면에 형성되며, 제 1 항의 점착제 조성물의 경화물을 포함하는 점착제층을 포함하는 실 테이프.
- 제 10 항에 있어서, 기재층은 아크릴 필름, 폴리올레핀 필름, 폴리아미드 필름, 폴리카보네이트 필름, 폴리우레탄 필름, 셀룰로오스 아세테이트 필름 및 폴리에스테르 필름으로 이루어진 군으로부터 선택된 하나 이상의 필름인 실 테이프.
- 제 11 항에 있어서, 폴리에스테르 필름은 폴리에틸렌테레프탈레이트 필름, 폴리에틸렌나트탈레이트 필름 및 폴리부틸렌테레프탈레이트 필름으로 이루어진 군으로부터 선택되는 하나 이상인 실 테이프.
- 제 10 항에 있어서, 기재층의 두께는 10 내지 200㎛인 실 테이프.
- 제 10 항에 있어서, 점착제층의 두께는 2 내지 100㎛인 실 테이프.
- 제 10 항에 있어서, 점착제층은 유리에 대하여, 5 mm/sec의 박리 속도 및 180도의 박리 각도로 측정한 상온에서의 박리력이 370 gf/25mm 이하인 실 테이프.
- 양극판, 음극판 및 상기 양극판과 음극판 사이에 개재되는 분리막을 포함하는 전극 조립체; 및 상기 전극 조립체의 외주면에 점착제층을 매개로 부착되어 있는 제 10 항의 실 테이프를 포함하는 이차전지.
- 제 16 항에 있어서, 실 테이프는 상기 전극 조립체의 외주면 중 분리막의 최외측 단부가 위치하는 마감부를 포함하여 상기 외주면을 둘러싸도록 부착되어 있는 이차전지.
- 제 16 항에 있어서, 점착제층은 분리막에 대하여, 5 mm/sec의 박리 속도 및 180도의 박리 각도로 측정한 상온에서의 박리력이 1200 gf/25mm 이하인 이차전지.
- 제 16 항에 있어서, 상기 전지는 원통형인 이차전지.
Priority Applications (5)
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JP2016534537A JP6210579B2 (ja) | 2013-08-16 | 2014-08-14 | 二次電池用のシールテープ及びそれを含む二次電池 |
US14/911,634 US10619079B2 (en) | 2013-08-16 | 2014-08-14 | Pressure-sensitive adhesive composition |
PL14836234T PL3023470T3 (pl) | 2013-08-16 | 2014-08-14 | Kompozycja adhezyjna |
EP14836234.6A EP3023470B1 (en) | 2013-08-16 | 2014-08-14 | Adhesive composition |
CN201480057381.5A CN105637057B (zh) | 2013-08-16 | 2014-08-14 | 压敏粘合剂组合物 |
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KR10-2013-0097404 | 2013-08-16 | ||
KR20130097404 | 2013-08-16 | ||
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KR10-2014-0071993 | 2014-06-13 | ||
KR10-2014-0106142 | 2014-08-14 | ||
KR1020140106142A KR101807909B1 (ko) | 2013-08-16 | 2014-08-14 | 실 테이프 |
KR10-2014-0106147 | 2014-08-14 | ||
KR1020140106147A KR101742357B1 (ko) | 2013-08-16 | 2014-08-14 | 점착제 조성물 |
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PCT/KR2014/007596 WO2015023152A1 (ko) | 2013-08-16 | 2014-08-14 | 실 테이프 |
PCT/KR2014/007597 WO2015023153A1 (ko) | 2013-08-16 | 2014-08-14 | 점착제 조성물 |
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US (2) | US10435597B2 (ko) |
EP (2) | EP3020777B1 (ko) |
JP (2) | JP6210579B2 (ko) |
KR (2) | KR101807909B1 (ko) |
CN (2) | CN105637057B (ko) |
PL (2) | PL3023470T3 (ko) |
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KR102430597B1 (ko) * | 2018-10-02 | 2022-08-08 | 산진 옵토일렉트로닉스 (쑤저우) 컴퍼니 리미티드 | 편광판 및 그 제조방법 |
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KR20150020146A (ko) | 2015-02-25 |
US10435597B2 (en) | 2019-10-08 |
EP3020777A1 (en) | 2016-05-18 |
TW201522079A (zh) | 2015-06-16 |
CN105793371A (zh) | 2016-07-20 |
JP6222506B2 (ja) | 2017-11-01 |
US20160186021A1 (en) | 2016-06-30 |
CN105793371B (zh) | 2019-02-15 |
JP2016528357A (ja) | 2016-09-15 |
CN105637057A (zh) | 2016-06-01 |
EP3023470A1 (en) | 2016-05-25 |
TWI558780B (zh) | 2016-11-21 |
PL3023470T3 (pl) | 2020-11-16 |
EP3020777B1 (en) | 2020-06-03 |
EP3020777A4 (en) | 2017-03-15 |
CN105637057B (zh) | 2018-06-08 |
KR101807909B1 (ko) | 2017-12-12 |
KR20150020147A (ko) | 2015-02-25 |
TWI581975B (zh) | 2017-05-11 |
PL3020777T3 (pl) | 2021-01-25 |
KR101742357B1 (ko) | 2017-05-31 |
EP3023470A4 (en) | 2017-06-14 |
WO2015023152A1 (ko) | 2015-02-19 |
US20160177136A1 (en) | 2016-06-23 |
US10619079B2 (en) | 2020-04-14 |
EP3023470B1 (en) | 2020-06-10 |
JP2016532752A (ja) | 2016-10-20 |
TW201525091A (zh) | 2015-07-01 |
JP6210579B2 (ja) | 2017-10-11 |
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