JP6325633B2 - 透明導電膜貼付用粘着剤および粘着シート - Google Patents
透明導電膜貼付用粘着剤および粘着シート Download PDFInfo
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- JP6325633B2 JP6325633B2 JP2016216141A JP2016216141A JP6325633B2 JP 6325633 B2 JP6325633 B2 JP 6325633B2 JP 2016216141 A JP2016216141 A JP 2016216141A JP 2016216141 A JP2016216141 A JP 2016216141A JP 6325633 B2 JP6325633 B2 JP 6325633B2
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- Prior art keywords
- transparent conductive
- conductive film
- pressure
- sensitive adhesive
- meth
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- 125000002619 bicyclic group Chemical group 0.000 description 1
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- LWMFAFLIWMPZSX-UHFFFAOYSA-N bis[2-(4,5-dihydro-1h-imidazol-2-yl)propan-2-yl]diazene Chemical compound N=1CCNC=1C(C)(C)N=NC(C)(C)C1=NCCN1 LWMFAFLIWMPZSX-UHFFFAOYSA-N 0.000 description 1
- OHJMTUPIZMNBFR-UHFFFAOYSA-N biuret Chemical compound NC(=O)NC(N)=O OHJMTUPIZMNBFR-UHFFFAOYSA-N 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 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
- CXKCTMHTOKXKQT-UHFFFAOYSA-N cadmium oxide Inorganic materials [Cd]=O CXKCTMHTOKXKQT-UHFFFAOYSA-N 0.000 description 1
- CFEAAQFZALKQPA-UHFFFAOYSA-N cadmium(2+);oxygen(2-) Chemical compound [O-2].[Cd+2] CFEAAQFZALKQPA-UHFFFAOYSA-N 0.000 description 1
- 239000004359 castor oil Substances 0.000 description 1
- 235000019438 castor oil Nutrition 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 150000004770 chalcogenides Chemical class 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- TXWRERCHRDBNLG-UHFFFAOYSA-N cubane Chemical group C12C3C4C1C1C4C3C12 TXWRERCHRDBNLG-UHFFFAOYSA-N 0.000 description 1
- 150000001924 cycloalkanes Chemical group 0.000 description 1
- LMGZGXSXHCMSAA-UHFFFAOYSA-N cyclodecane Chemical group C1CCCCCCCCC1 LMGZGXSXHCMSAA-UHFFFAOYSA-N 0.000 description 1
- DDTBPAQBQHZRDW-UHFFFAOYSA-N cyclododecane Chemical group C1CCCCCCCCCCC1 DDTBPAQBQHZRDW-UHFFFAOYSA-N 0.000 description 1
- 125000001162 cycloheptenyl group Chemical group C1(=CCCCCC1)* 0.000 description 1
- 125000000582 cycloheptyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- KBLWLMPSVYBVDK-UHFFFAOYSA-N cyclohexyl prop-2-enoate Chemical group C=CC(=O)OC1CCCCC1 KBLWLMPSVYBVDK-UHFFFAOYSA-N 0.000 description 1
- 125000004113 cyclononanyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C([H])([H])C1([H])[H] 0.000 description 1
- 125000000522 cyclooctenyl group Chemical group C1(=CCCCCCC1)* 0.000 description 1
- 125000000640 cyclooctyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C([H])([H])C1([H])[H] 0.000 description 1
- KYTNZWVKKKJXFS-UHFFFAOYSA-N cycloundecane Chemical group C1CCCCCCCCCC1 KYTNZWVKKKJXFS-UHFFFAOYSA-N 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- ZFTFAPZRGNKQPU-UHFFFAOYSA-N dicarbonic acid Chemical compound OC(=O)OC(O)=O ZFTFAPZRGNKQPU-UHFFFAOYSA-N 0.000 description 1
- 238000007607 die coating method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 1
- 125000005448 ethoxyethyl group Chemical group [H]C([H])([H])C([H])([H])OC([H])([H])C([H])([H])* 0.000 description 1
- 125000005745 ethoxymethyl group Chemical group [H]C([H])([H])C([H])([H])OC([H])([H])* 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 239000011086 glassine Substances 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 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
- 238000007756 gravure coating Methods 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-M hexanoate Chemical compound CCCCCC([O-])=O FUZZWVXGSFPDMH-UHFFFAOYSA-M 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- DLINORNFHVEIFE-UHFFFAOYSA-N hydrogen peroxide;zinc Chemical compound [Zn].OO DLINORNFHVEIFE-UHFFFAOYSA-N 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- GJRQTCIYDGXPES-UHFFFAOYSA-N iso-butyl acetate Natural products CC(C)COC(C)=O GJRQTCIYDGXPES-UHFFFAOYSA-N 0.000 description 1
- FGKJLKRYENPLQH-UHFFFAOYSA-M isocaproate Chemical compound CC(C)CCC([O-])=O FGKJLKRYENPLQH-UHFFFAOYSA-M 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 1
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 1
- OQAGVSWESNCJJT-UHFFFAOYSA-N isovaleric acid methyl ester Natural products COC(=O)CC(C)C OQAGVSWESNCJJT-UHFFFAOYSA-N 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 description 1
- 125000005397 methacrylic acid ester group Chemical group 0.000 description 1
- 125000004184 methoxymethyl group Chemical group [H]C([H])([H])OC([H])([H])* 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 125000001421 myristyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 1
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 125000002872 norbornadienyl group Chemical group C12=C(C=C(CC1)C2)* 0.000 description 1
- JFNLZVQOOSMTJK-KNVOCYPGSA-N norbornene Chemical compound C1[C@@H]2CC[C@H]1C=C2 JFNLZVQOOSMTJK-KNVOCYPGSA-N 0.000 description 1
- 125000003518 norbornenyl group Chemical group C12(C=CC(CC1)C2)* 0.000 description 1
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920003050 poly-cycloolefin Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 125000003367 polycyclic group Chemical group 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920006290 polyethylene naphthalate film Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000306 polymethylpentene Polymers 0.000 description 1
- 239000011116 polymethylpentene Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- BWJUFXUULUEGMA-UHFFFAOYSA-N propan-2-yl propan-2-yloxycarbonyloxy carbonate Chemical compound CC(C)OC(=O)OOC(=O)OC(C)C BWJUFXUULUEGMA-UHFFFAOYSA-N 0.000 description 1
- LFULEKSKNZEWOE-UHFFFAOYSA-N propanil Chemical compound CCC(=O)NC1=CC=C(Cl)C(Cl)=C1 LFULEKSKNZEWOE-UHFFFAOYSA-N 0.000 description 1
- KOPQZJAYZFAPBC-UHFFFAOYSA-N propanoyl propaneperoxoate Chemical compound CCC(=O)OOC(=O)CC KOPQZJAYZFAPBC-UHFFFAOYSA-N 0.000 description 1
- YPVDWEHVCUBACK-UHFFFAOYSA-N propoxycarbonyloxy propyl carbonate Chemical compound CCCOC(=O)OOC(=O)OCCC YPVDWEHVCUBACK-UHFFFAOYSA-N 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 125000003003 spiro group Chemical group 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- NMOALOSNPWTWRH-UHFFFAOYSA-N tert-butyl 7,7-dimethyloctaneperoxoate Chemical compound CC(C)(C)CCCCCC(=O)OOC(C)(C)C NMOALOSNPWTWRH-UHFFFAOYSA-N 0.000 description 1
- GJBRNHKUVLOCEB-UHFFFAOYSA-N tert-butyl benzenecarboperoxoate Chemical compound CC(C)(C)OOC(=O)C1=CC=CC=C1 GJBRNHKUVLOCEB-UHFFFAOYSA-N 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000001302 tertiary amino group Chemical group 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- 239000005341 toughened glass Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
- 229920006305 unsaturated polyester Polymers 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Images
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- Liquid Crystal (AREA)
- Laminated Bodies (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
Description
〔透明導電膜貼付用粘着剤〕
本実施形態に係る透明導電膜貼付用粘着剤(以下、単に「粘着剤」という場合がある。)は、透明導電膜を貼付対象とし、以下に説明する粘着性組成物(以下「粘着性組成物P」という。)を架橋してなるものである。透明導電膜の詳細は後述する。
(メタ)アクリル酸エステル重合体(A)は、当該重合体を構成するモノマー単位として、炭素数が7以上の脂環式構造を有するモノマー(脂環式構造含有モノマー)を含有する。上記粘着性組成物Pにおいては、(メタ)アクリル酸エステル重合体(A)が上記脂環式構造含有モノマーを含有することで、当該(メタ)アクリル酸エステル重合体(A)が酸成分を含有しなくても、得られる粘着剤は、透明導電膜に対する密着性が高く、耐久性にも優れたものとなる。これは、透明導電膜と炭素数が7以上の脂環式構造との親和性や相互作用が比較的強いためと考えられる。
架橋剤(B)としては、(メタ)アクリル酸エステル重合体(A)が有する反応性官能基(水酸基、アミノ基等)に対して反応性を有するものであればよく、例えば、イソシアネート系架橋剤、エポキシ系架橋剤、アミン系架橋剤、メラミン系架橋剤、アジリジン系架橋剤、ヒドラジン系架橋剤、アルデヒド系架橋剤、オキサゾリン系架橋剤、金属アルコキシド系架橋剤、アンモニウム塩系架橋剤等が挙げられる。特に、(メタ)アクリル酸エステル重合体(A)が水酸基を有する場合には、当該水酸基との反応性に優れたイソシアネート系架橋剤を使用することが好ましい。架橋剤(B)は、1種を単独で、または2種以上を組み合わせて使用することができる。なお、金属キレート系架橋剤は、透明導電膜と作用したり、透明導電膜に対するリワーク性を悪化させる場合があるため、架橋剤(B)としては好ましくない。
粘着性組成物Pには、所望により、アクリル系粘着剤に通常使用されている各種添加剤、例えば、帯電防止剤、シランカップリング剤、粘着付与剤、酸化防止剤、紫外線吸収剤、光安定剤、軟化剤、充填剤、屈折率調整剤等を添加することができる。
図1に示すように、第1の実施形態に係る透明導電膜貼付用粘着シート(以下、単に「粘着シート」という場合がある。)1Aは、下から順に、剥離シート12と、剥離シート12の剥離面に積層された粘着剤層11と、粘着剤層11に積層された基材13とから構成される。
1.(メタ)アクリル酸エステル重合体の調製
攪拌機、温度計、還流冷却器、滴下装置および窒素導入管を備えた反応容器に、アクリル酸n−ブチル74質量部、アクリル酸メチル5質量部、アクリル酸イソボルニル20質量部、アクリル酸2−ヒドロキシエチル1質量部、酢酸エチル200質量部、および2,2'−アゾビスイソブチロニトリル0.08質量部を仕込み、上記反応容器内の空気を窒素ガスで置換した。この窒素雰囲気下中で攪拌しながら、反応溶液を60℃に昇温し、16時間反応させた後、室温まで冷却した。ここで、得られた溶液の一部を後述する方法で分子量を測定し、重量平均分子量(Mw)185万の(メタ)アクリル酸エステル重合体(A)の生成を確認した。
上記工程(1)で得られた(メタ)アクリル酸エステル重合体(A)100質量部(固形分換算値;以下同じ)と、架橋剤(B)として、トリメチロールプロパン変性キシリレンジイソシアネート(綜研化学社製,商品名「TD−75」)0.4質量部とを混合し、十分に撹拌して、酢酸エチルで希釈することにより、粘着性組成物の塗布溶液を得た。
[(メタ)アクリル酸エステル重合体]
BA:アクリル酸n−ブチル
MA:アクリル酸メチル
HEA:アクリル酸2−ヒドロキシエチル
IBXA:アクリル酸イソボルニル
ADMMA:メタクリル酸アダマンチル
DCPA:アクリル酸ジシクロペンタニル
PhEA:アクリル酸2−フェノキシエチル
CHA:アクリル酸シクロヘキシル
得られた粘着性組成物の塗布溶液を、ポリエチレンテレフタレートフィルムの片面をシリコーン系剥離剤で剥離処理した剥離シート(リンテック社製,SP−PET3811,厚さ:38μm)の剥離処理面に、乾燥後の厚さが25μmになるようにナイフコーターで塗布したのち、90℃で1分間加熱処理して粘着剤層を形成した。
(メタ)アクリル酸エステル重合体(A)を構成する各モノマーの種類および割合、(メタ)アクリル酸エステル重合体(A)の重量平均分子量、ならびに架橋剤(B)の配合量を表1に示すように変更する以外、実施例1と同様にして粘着剤層付き偏光板を製造した。なお、実施例7では、帯電防止剤としてピリジニウム塩(広栄化学社製,商品名「IL−P18」)をさらに配合した粘着性組成物を使用した。
<測定条件>
・GPC測定装置:東ソー社製,HLC−8020
・GPCカラム(以下の順に通過):東ソー社製
TSK guard column HXL−H
TSK gel GMHXL(×2)
TSK gel G2000HXL
・測定溶媒:テトラヒドロフラン
・測定温度:40℃
実施例または比較例にて粘着剤層付き偏光板の作製に使用した偏光板に替えて、ポリエチレンテレフタレートフィルムの片面をシリコーン系剥離剤で剥離処理した剥離シート(リンテック社製,SP−PET3801,厚さ:38μm)を使用し、粘着シートを作製した。具体的には、実施例または比較例の製造過程で得られた剥離シート/粘着剤層(厚さ:25μm)からなる構成体の露出している粘着剤層上に、上記剥離シートを剥離処理面側が接するように積層した。これにより、剥離シート/粘着剤層/剥離シートの構成からなる粘着シートを作製した。
測定サンプルとして、ゲル分率の測定に用いた粘着シートと同様の粘着シート(7日間養生済み)を用意した。当該粘着シートの粘着剤層(厚さ:25μm)について、ヘイズメーター(日本電色工業社製,NDH2000)を用いて、JIS K7136:2000に準じてヘイズ値(%)を測定した。結果を表1に示す。
縦100mm、横100mm、厚さ0.7mmの無アルカリガラス基板の片面に、厚さ155nmのITOからなる透明導電膜が形成された透明導電膜付きガラス(ジオマテック社製,製品名「FLAT ITO膜付きガラス」)を、被着体として用意した。
実施例または比較例で得られた粘着剤層付き偏光板を裁断し、100mm×100mmの大きさのサンプルを作製した。サンプルとしては、粘着剤層付き偏光板作製(粘着剤層形成)から23℃、50%RHの環境下にて7日間保管した後のものを用意した。このサンプルから剥離シートを剥がし、露出した粘着剤層を介して、試験例3と同じ被着体の透明導電膜に貼付したのち、栗原製作所製オートクレーブにて0.5MPa、50℃で、20分加圧した。
◎:浮きや剥がれが確認されなかった。
○:0.5mm以下の大きさの浮きや剥がれが確認された。
×:0.6mm以上の大きさの浮きや剥がれが確認された。
<耐久条件>
・80℃dry
・60℃,相対湿度90%RH
11…粘着剤層
12,12a,12b…剥離シート
13…基材
Claims (12)
- 重量平均分子量が140万〜300万であり、重合体を構成するモノマー単位として、炭素数が7以上の脂環式構造を有するモノマーを0.5〜15質量%含有する(メタ)アクリル酸エステル重合体(A)と、
架橋剤(B)と
を含有する粘着性組成物を架橋してなり、
ゲル分率が70〜90%である
ことを特徴とする透明導電膜貼付用粘着剤。 - 前記炭素数が7以上の脂環式構造は、多環の脂環式構造であることを特徴とする請求項1に記載の透明導電膜貼付用粘着剤。
- 前記炭素数が7以上の脂環式構造は、ジシクロペンタジエン骨格、アダマンタン骨格またはイソボルニル骨格を含むことを特徴とする請求項1または2に記載の透明導電膜貼付用粘着剤。
- 前記(メタ)アクリル酸エステル重合体(A)は、当該重合体を構成するモノマー単位として、水酸基を有するモノマーを0.1〜10質量%含有することを特徴とする請求項1〜3のいずれか一項に記載の透明導電膜貼付用粘着剤。
- 前記(メタ)アクリル酸エステル重合体(A)は、当該重合体を構成するモノマー単位として、カルボキシル基を有するモノマーを実質的に含有しないことを特徴とする請求項1〜4のいずれか一項に記載の透明導電膜貼付用粘着剤。
- 前記(メタ)アクリル酸エステル重合体(A)100質量部に対して、前記架橋剤(B)を0.2〜3質量部含有することを特徴とする請求項1〜5のいずれかに記載の透明導電膜貼付用粘着剤。
- 前記架橋剤(B)は、イソシアネート系架橋剤であることを特徴とする請求項1〜6のいずれか一項に記載の透明導電膜貼付用粘着剤。
- 前記透明導電膜は、スズドープ酸化インジウムからなることを特徴とする請求項1〜7のいずれか一項に記載の透明導電膜貼付用粘着剤。
- 基材と、粘着剤層とを備えた透明導電膜貼付用粘着シートであって、
前記粘着剤層は、請求項1〜8のいずれか一項に記載の透明導電膜貼付用粘着剤からなる
ことを特徴とする透明導電膜貼付用粘着シート。 - 前記基材は、光学部材であることを特徴とする請求項9に記載の透明導電膜貼付用粘着シート。
- 前記光学部材は、偏光板であることを特徴とする請求項10に記載の透明導電膜貼付用粘着シート。
- 2枚の剥離シートと、
前記2枚の剥離シートの剥離面と接するように前記剥離シートに挟持された粘着剤層と
を備えた透明導電膜貼付用粘着シートであって、
前記粘着剤層は、請求項1〜8のいずれか一項に記載の透明導電膜貼付用粘着剤からなる
ことを特徴とする透明導電膜貼付用粘着シート。
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