JP6472044B2 - Double-sided adhesive film and protective member for information display screen using the same - Google Patents
Double-sided adhesive film and protective member for information display screen using the same Download PDFInfo
- Publication number
- JP6472044B2 JP6472044B2 JP2015039146A JP2015039146A JP6472044B2 JP 6472044 B2 JP6472044 B2 JP 6472044B2 JP 2015039146 A JP2015039146 A JP 2015039146A JP 2015039146 A JP2015039146 A JP 2015039146A JP 6472044 B2 JP6472044 B2 JP 6472044B2
- Authority
- JP
- Japan
- Prior art keywords
- sensitive adhesive
- pressure
- adhesive layer
- double
- film
- 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.)
- Active
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- 230000001681 protective effect Effects 0.000 title claims description 82
- 239000002313 adhesive film Substances 0.000 title claims description 23
- 239000010410 layer Substances 0.000 claims description 161
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 119
- 238000001179 sorption measurement Methods 0.000 claims description 51
- 239000012790 adhesive layer Substances 0.000 claims description 38
- 229920005645 diorganopolysiloxane polymer Polymers 0.000 claims description 25
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 22
- 229920006243 acrylic copolymer Polymers 0.000 claims description 17
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 15
- 239000003431 cross linking reagent Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 13
- 229920001296 polysiloxane Polymers 0.000 claims description 13
- 239000012948 isocyanate Substances 0.000 claims description 12
- 150000002513 isocyanates Chemical class 0.000 claims description 12
- 241000428199 Mustelinae Species 0.000 claims description 11
- 239000011521 glass Substances 0.000 claims description 11
- 238000002834 transmittance Methods 0.000 claims description 8
- 125000003342 alkenyl group Chemical group 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 229920006136 organohydrogenpolysiloxane Polymers 0.000 claims description 6
- 238000007259 addition reaction Methods 0.000 claims description 5
- 229920002050 silicone resin Polymers 0.000 claims description 3
- 239000010408 film Substances 0.000 description 62
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 33
- 238000000576 coating method Methods 0.000 description 33
- 239000011248 coating agent Substances 0.000 description 32
- 239000007787 solid Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 19
- -1 ITO Chemical class 0.000 description 15
- 239000013039 cover film Substances 0.000 description 14
- 229920001577 copolymer Polymers 0.000 description 11
- 230000003746 surface roughness Effects 0.000 description 11
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 150000001875 compounds Chemical class 0.000 description 10
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 10
- 238000010030 laminating Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- NDWUBGAGUCISDV-UHFFFAOYSA-N 4-hydroxybutyl prop-2-enoate Chemical compound OCCCCOC(=O)C=C NDWUBGAGUCISDV-UHFFFAOYSA-N 0.000 description 9
- 239000000853 adhesive Substances 0.000 description 9
- 230000001070 adhesive effect Effects 0.000 description 9
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 7
- 238000004132 cross linking Methods 0.000 description 7
- 229920006267 polyester film Polymers 0.000 description 7
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229920001225 polyester resin Polymers 0.000 description 6
- 239000004645 polyester resin Substances 0.000 description 6
- 229920000178 Acrylic resin Polymers 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 description 5
- 239000005020 polyethylene terephthalate Substances 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 239000004925 Acrylic resin Substances 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 239000002985 plastic film Substances 0.000 description 4
- 229920006255 plastic film Polymers 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 239000005060 rubber Substances 0.000 description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 125000000962 organic group Chemical group 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- FKTHNVSLHLHISI-UHFFFAOYSA-N 1,2-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC=C1CN=C=O FKTHNVSLHLHISI-UHFFFAOYSA-N 0.000 description 2
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 2
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical class CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 125000005397 methacrylic acid ester group Chemical group 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229920006289 polycarbonate film Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 2
- NNOZGCICXAYKLW-UHFFFAOYSA-N 1,2-bis(2-isocyanatopropan-2-yl)benzene Chemical compound O=C=NC(C)(C)C1=CC=CC=C1C(C)(C)N=C=O NNOZGCICXAYKLW-UHFFFAOYSA-N 0.000 description 1
- GHXPTDPKJYFMOE-UHFFFAOYSA-N 1,2-bis(isocyanatomethyl)cyclohexane Chemical compound O=C=NCC1CCCCC1CN=C=O GHXPTDPKJYFMOE-UHFFFAOYSA-N 0.000 description 1
- ZXHZWRZAWJVPIC-UHFFFAOYSA-N 1,2-diisocyanatonaphthalene Chemical compound C1=CC=CC2=C(N=C=O)C(N=C=O)=CC=C21 ZXHZWRZAWJVPIC-UHFFFAOYSA-N 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- OVBFMUAFNIIQAL-UHFFFAOYSA-N 1,4-diisocyanatobutane Chemical compound O=C=NCCCCN=C=O OVBFMUAFNIIQAL-UHFFFAOYSA-N 0.000 description 1
- CDMDQYCEEKCBGR-UHFFFAOYSA-N 1,4-diisocyanatocyclohexane Chemical compound O=C=NC1CCC(N=C=O)CC1 CDMDQYCEEKCBGR-UHFFFAOYSA-N 0.000 description 1
- STFXXRRQKFUYEU-UHFFFAOYSA-N 16-methylheptadecyl prop-2-enoate Chemical compound CC(C)CCCCCCCCCCCCCCCOC(=O)C=C STFXXRRQKFUYEU-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- JKNCOURZONDCGV-UHFFFAOYSA-N 2-(dimethylamino)ethyl 2-methylprop-2-enoate Chemical compound CN(C)CCOC(=O)C(C)=C JKNCOURZONDCGV-UHFFFAOYSA-N 0.000 description 1
- BEWCNXNIQCLWHP-UHFFFAOYSA-N 2-(tert-butylamino)ethyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCNC(C)(C)C BEWCNXNIQCLWHP-UHFFFAOYSA-N 0.000 description 1
- SFPNZPQIIAJXGL-UHFFFAOYSA-N 2-ethoxyethyl 2-methylprop-2-enoate Chemical compound CCOCCOC(=O)C(C)=C SFPNZPQIIAJXGL-UHFFFAOYSA-N 0.000 description 1
- WDQMWEYDKDCEHT-UHFFFAOYSA-N 2-ethylhexyl 2-methylprop-2-enoate Chemical compound CCCCC(CC)COC(=O)C(C)=C WDQMWEYDKDCEHT-UHFFFAOYSA-N 0.000 description 1
- IEVADDDOVGMCSI-UHFFFAOYSA-N 2-hydroxybutyl 2-methylprop-2-enoate Chemical compound CCC(O)COC(=O)C(C)=C IEVADDDOVGMCSI-UHFFFAOYSA-N 0.000 description 1
- YXYJVFYWCLAXHO-UHFFFAOYSA-N 2-methoxyethyl 2-methylprop-2-enoate Chemical compound COCCOC(=O)C(C)=C YXYJVFYWCLAXHO-UHFFFAOYSA-N 0.000 description 1
- CFVWNXQPGQOHRJ-UHFFFAOYSA-N 2-methylpropyl prop-2-enoate Chemical compound CC(C)COC(=O)C=C CFVWNXQPGQOHRJ-UHFFFAOYSA-N 0.000 description 1
- BYPFICORERPGJY-UHFFFAOYSA-N 3,4-diisocyanatobicyclo[2.2.1]hept-2-ene Chemical compound C1CC2(N=C=O)C(N=C=O)=CC1C2 BYPFICORERPGJY-UHFFFAOYSA-N 0.000 description 1
- GNSFRPWPOGYVLO-UHFFFAOYSA-N 3-hydroxypropyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCO GNSFRPWPOGYVLO-UHFFFAOYSA-N 0.000 description 1
- QZPSOSOOLFHYRR-UHFFFAOYSA-N 3-hydroxypropyl prop-2-enoate Chemical compound OCCCOC(=O)C=C QZPSOSOOLFHYRR-UHFFFAOYSA-N 0.000 description 1
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 1
- JTHZUSWLNCPZLX-UHFFFAOYSA-N 6-fluoro-3-methyl-2h-indazole Chemical compound FC1=CC=C2C(C)=NNC2=C1 JTHZUSWLNCPZLX-UHFFFAOYSA-N 0.000 description 1
- XFOFBPRPOAWWPA-UHFFFAOYSA-N 6-hydroxyhexyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCCCCO XFOFBPRPOAWWPA-UHFFFAOYSA-N 0.000 description 1
- OCIFJWVZZUDMRL-UHFFFAOYSA-N 6-hydroxyhexyl prop-2-enoate Chemical compound OCCCCCCOC(=O)C=C OCIFJWVZZUDMRL-UHFFFAOYSA-N 0.000 description 1
- DXPPIEDUBFUSEZ-UHFFFAOYSA-N 6-methylheptyl prop-2-enoate Chemical compound CC(C)CCCCCOC(=O)C=C DXPPIEDUBFUSEZ-UHFFFAOYSA-N 0.000 description 1
- CUXGDKOCSSIRKK-UHFFFAOYSA-N 7-methyloctyl prop-2-enoate Chemical compound CC(C)CCCCCCOC(=O)C=C CUXGDKOCSSIRKK-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- ZAFNJMIOTHYJRJ-UHFFFAOYSA-N Diisopropyl ether Chemical compound CC(C)OC(C)C ZAFNJMIOTHYJRJ-UHFFFAOYSA-N 0.000 description 1
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
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- 125000000217 alkyl group Chemical group 0.000 description 1
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- GCTPMLUUWLLESL-UHFFFAOYSA-N benzyl prop-2-enoate Chemical compound C=CC(=O)OCC1=CC=CC=C1 GCTPMLUUWLLESL-UHFFFAOYSA-N 0.000 description 1
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- 239000012046 mixed solvent Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- HMZGPNHSPWNGEP-UHFFFAOYSA-N octadecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C(C)=C HMZGPNHSPWNGEP-UHFFFAOYSA-N 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
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- FBCQUCJYYPMKRO-UHFFFAOYSA-N prop-2-enyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCC=C FBCQUCJYYPMKRO-UHFFFAOYSA-N 0.000 description 1
- AYEFIAVHMUFQPZ-UHFFFAOYSA-N propane-1,2-diol;prop-2-enoic acid Chemical compound CC(O)CO.OC(=O)C=C AYEFIAVHMUFQPZ-UHFFFAOYSA-N 0.000 description 1
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- 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
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Images
Landscapes
- Laminated Bodies (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
本発明は、ディスプレイパネルの情報表示画面等の被着体に、貼り付けたり、取り外しが可能な両面粘着フィルム及びそれを用いた情報表示画面用保護部材に関するもので、より詳細には、各種電子・電気機器の表示装置として使用される液晶ディスプレイ、プラズマディスプレイ、有機EL等の情報表示画面の保護及び視認性の向上を目的として、この情報表示画面に、硬質の透明保護カバーを貼着するための両面粘着フィルム、及び前記透明保護カバーと両面粘着フィルムとの積層体からなる情報表示画面用の保護部材に関する。 The present invention relates to a double-sided adhesive film that can be attached to or detached from an adherend such as an information display screen of a display panel and a protective member for an information display screen using the same. To stick a hard transparent protective cover to this information display screen for the purpose of protecting and improving the visibility of information display screens such as liquid crystal displays, plasma displays, and organic EL displays used as display devices for electrical equipment. And a protective member for an information display screen comprising a laminate of the transparent protective cover and the double-sided adhesive film.
例えば、液晶等の表示画面の保護及び視認性向上を目的として、透明ゲルを介して透明部材をディスプレイパネルの情報表示画面に密着させる方法が知られている。(特許文献1)。前記の方法によると、ディスプレイパネルのガラス基板と、ガラスやアクリル等の硬質板である従来の透明部材の接合では、ガラス基板と硬質板の透明部材が面接触して貼り合わされるため、貼り合わせ時に気泡を巻き込み易いだけでなく、一旦貼り合わせてしまうと巻き込んだ気泡を逃がすことが難しかった。気泡を巻き込んだ場合、前記気泡によりディスプレイの輝度、明るさ、色が不均一となり表示むらが発生するため、貼り直しや気泡の押し出しなどの作業が必要になる。巻き込んだ気泡を押し出すために、透明部材の表面から気泡を指で強く押し出したり、貼り直しを繰り返すうちにディスプレイ表面の外観を損なうことがあった。 For example, for the purpose of protecting the display screen of liquid crystal or the like and improving the visibility, a method in which a transparent member is closely attached to the information display screen of the display panel via a transparent gel is known. (Patent Document 1). According to the above method, the glass substrate of the display panel and the conventional transparent member that is a hard plate such as glass or acrylic are bonded together because the glass substrate and the transparent member of the hard plate are bonded in surface contact. Not only was it easy to entrain bubbles, but once they were pasted together, it was difficult to escape the entrained bubbles. When bubbles are entrained, the brightness, brightness, and color of the display become nonuniform due to the bubbles and display unevenness occurs. Therefore, operations such as re-sticking and extruding bubbles are required. In order to extrude the entrained bubbles, the appearance of the display surface may be impaired while the bubbles are strongly pushed out from the surface of the transparent member with a finger or repeatedly applied.
また、表示体を成す被着面上に、アクリル系又はウレタン系樹脂を主成分としてなる応力緩和層を配置し、前記応力緩和層の片面に親水性液状層を介してガラス又は樹脂板から成る透明保護体を前記被着面に対して貼着する表示装置の保護体が知られている。(特許文献2)。前記の保護体は、表示体を成す被着面上に、前記応力緩和層、親水性液状層及び透明保護体を積層するという工程が必要となる、そのため高価な製造装置が必要となり、工程も複雑なものとなるので、結果として高価なものになってしまう欠点があった。 Further, a stress relaxation layer mainly composed of an acrylic or urethane resin is disposed on the adherend surface constituting the display body, and is formed of glass or a resin plate via a hydrophilic liquid layer on one side of the stress relaxation layer. 2. Description of the Related Art A display device protector that attaches a transparent protector to the adherend surface is known. (Patent Document 2). The protective body requires a process of laminating the stress relaxation layer, the hydrophilic liquid layer, and the transparent protective body on the adherend surface that forms the display body. Therefore, an expensive manufacturing apparatus is required, and the process is also performed. Since it becomes complicated, there is a drawback that it becomes expensive as a result.
本発明は、ディスプレイパネルの情報表示画面等の被着体に、貼り付けたり、取り外しが可能であり、硬質の保護部材を貼着した場合であっても、貼り付け時に気泡の巻き込みが発生しにくく、視認性に優れた、両面粘着フィルム及びそれを用いた情報表示画面用の保護部材を提供することを目的とする。 The present invention can be attached to or detached from an adherend such as an information display screen of a display panel, and even when a hard protective member is attached, entrainment of bubbles occurs at the time of attachment. An object of the present invention is to provide a double-sided pressure-sensitive adhesive film that is difficult and excellent in visibility, and a protective member for an information display screen using the same.
本発明者は、鋭意検討を行った結果、ディスプレイパネルの情報表示画面と、ガラス板からなる透明保護カバーと両面粘着フィルムを貼り合せた保護部材を貼り付ける場合、基材フィルムの一方の面に貼り付けたり、取り外しが可能な吸着層を積層し、もう一方の面にアクリル系共重合体とイソシアネート系架橋剤を必須成分とするアクリル系粘着剤層を積層してなる両面粘着フィルムにおいて、前記粘着剤層表面のマルテンス硬度が8〜15mN/mm2であり、かつ前記粘着剤層のゲル分率が35〜80%であるときに、透明保護カバーと粘着剤層を貼り付けて保護部材となすと、透明保護カバー表面の凹凸や、前記吸着層表面の凹凸を打ち消す様に粘着剤層が塑性変形できるために、前記粘着剤層に透明保護カバーを貼り合せた保護部材の状態で前記吸着層の表面を平滑に保つことが可能となり、情報表示画面に前記保護部材の吸着層を貼り付ける際に気泡の巻き込みが発生しにくくなる事を見出し、本発明を完成するに至った。 As a result of diligent study, the present inventor found that the information display screen of the display panel, the transparent protective cover made of a glass plate, and a protective member bonded with a double-sided adhesive film were attached to one surface of the base film. In the double-sided pressure-sensitive adhesive film formed by laminating an adhering layer that can be attached or removed, and laminating an acrylic pressure-sensitive adhesive layer containing an acrylic copolymer and an isocyanate-based crosslinking agent as essential components on the other surface, When the Martens hardness on the surface of the pressure-sensitive adhesive layer is 8 to 15 mN / mm 2 and the gel fraction of the pressure-sensitive adhesive layer is 35 to 80%, the transparent protective cover and the pressure-sensitive adhesive layer are pasted to form a protective member Then, since the adhesive layer can be plastically deformed so as to cancel the irregularities on the surface of the transparent protective cover and the irregularities on the surface of the adsorption layer, the protective part in which the transparent protective cover is bonded to the adhesive layer The surface of the adsorbing layer can be kept smooth in the state of the material, and it is found that bubbles are less likely to occur when the adsorbing layer of the protective member is attached to the information display screen, and the present invention is completed. It came to.
第1発明は、ディスプレイパネルの情報表示画面に透明保護カバーを貼着するための両面粘着フィルムであって、基材フィルムの一方の面にシリコーン樹脂を主成分とする吸着層を積層し、もう一方の面にアクリル系共重合体とイソシアネート系架橋剤を必須成分とするアクリル系粘着剤からなる粘着剤層を積層してなり、前記粘着剤層表面のマルテンス硬度が8〜15mN/mm2であり、かつ前記粘着剤層のゲル分率が35〜80%であることを特徴とする両面粘着フィルムである。 1st invention is the double-sided adhesive film for sticking a transparent protective cover on the information display screen of a display panel, Comprising: The adsorption layer which has a silicone resin as a main component is laminated | stacked on one side of a base film, A pressure-sensitive adhesive layer made of an acrylic pressure-sensitive adhesive having an acrylic copolymer and an isocyanate-based crosslinking agent as essential components is laminated on one surface, and the Martens hardness of the pressure-sensitive adhesive layer surface is 8 to 15 mN / mm 2 . And a pressure-sensitive adhesive layer having a gel fraction of 35 to 80%.
第2発明は、前記粘着剤層中のイソシアネート系架橋剤の添加量が0.05〜2.0重量%であることを特徴とする第1発明に記載の両面粘着フィルムである。 The second invention is the double-sided pressure-sensitive adhesive film according to the first invention, wherein the amount of the isocyanate-based crosslinking agent added in the pressure-sensitive adhesive layer is 0.05 to 2.0% by weight.
第3発明は、前記吸着層の厚みが10〜50μmであり、かつ前記粘着剤層の厚みが5〜30μmであることを特徴とする第1発明または第2発明に記載の両面粘着フィルムである。 3rd invention is a double-sided adhesive film as described in 1st invention or 2nd invention , wherein the thickness of the said adsorption layer is 10-50 micrometers, and the thickness of the said adhesive layer is 5-30 micrometers. .
第4発明は、前記吸着層が、1分子中に2個以上のアルケニル基を有するジオルガノポリシロキサンとオルガノハイドロジェンポリシロキサンからなるシリコーン組成物を、付加反応により硬化してなるものであり、前記ジオルガノポリシロキサンが、両末端にのみビニル基を有する直鎖状ジオルガノポリシロキサン、両末端及び側鎖にビニル基を有する直鎖状ジオルガノポリシロキサン、末端にのみビニル基を有する分岐状ジオルガノポリシロキサン、末端及び側鎖にビニル基を有する分岐状ジオルガノポリシロキサンから選ばれる少なくとも1種以上であることを特徴とする第1発明〜第3発明のいずれかに記載の両面粘着フィルムである。 In a fourth invention, the adsorption layer is obtained by curing a silicone composition comprising a diorganopolysiloxane having two or more alkenyl groups in one molecule and an organohydrogenpolysiloxane by an addition reaction, The diorganopolysiloxane is a linear diorganopolysiloxane having vinyl groups only at both ends, a linear diorganopolysiloxane having vinyl groups at both ends and side chains, and a branched form having vinyl groups only at the ends. The double-sided pressure-sensitive adhesive film according to any one of the first to third inventions, characterized in that it is at least one selected from diorganopolysiloxane and branched diorganopolysiloxane having vinyl groups at the terminals and side chains. It is.
第5発明は、透明保護カバーと、第1発明〜第4発明のいずれかに記載の両面粘着フィルムの粘着剤層を貼り合わせてなり、前記吸着層を介してディスプレイパネルの情報表示画面に貼着される情報表示画面用の保護部材において、前記透明保護カバーが、厚さ100〜1,000μmかつ全光線透過率85%以上であるガラス板であることを特徴とする情報表示画面用の保護部材である。 5th invention bonds a transparent protective cover and the adhesive layer of the double-sided adhesive film in any one of 1st invention- 4th invention, and affixes it on the information display screen of a display panel through the said adsorption layer. The protective member for an information display screen to be worn is characterized in that the transparent protective cover is a glass plate having a thickness of 100 to 1,000 μm and a total light transmittance of 85% or more. It is a member.
本発明の両面粘着フィルムは、基材フィルムの一方の面に吸着層を積層し、もう一方の面にアクリル系共重合体とイソシアネート系架橋剤を必須成分とするアクリル系粘着剤からなる粘着剤層を積層してなり、前記粘着剤層表面のマルテンス硬度とゲル分率を特定の範囲内とすることで、透明保護カバーと粘着剤層を貼着して保護部材の状態となした際に、透明保護カバー表面の凹凸や、前記吸着層表面の凹凸を打ち消す様に粘着剤層が塑性変形できるものとなり、前記保護部材の吸着層とディスプレイパネルの情報表示画面とを貼着させる際、面接触して貼着する条件でありながら、貼着界面において空気を逃がしながら貼着することが容易となり、貼り付け時に気泡の巻き込みを生じにくくするものである。 The double-sided pressure-sensitive adhesive film of the present invention is a pressure-sensitive adhesive composed of an acrylic pressure-sensitive adhesive having an adsorbing layer laminated on one surface of a base film and an acrylic copolymer and an isocyanate-based crosslinking agent as essential components on the other surface. When the layers are laminated and the Martens hardness and gel fraction on the surface of the pressure-sensitive adhesive layer are within a specific range, when the transparent protective cover and the pressure-sensitive adhesive layer are attached to form a protective member When the adhesive layer of the protective member and the information display screen of the display panel are attached, the adhesive layer can be plastically deformed so as to cancel the unevenness of the surface of the transparent protective cover and the unevenness of the surface of the adsorption layer. Although it is in the condition of contacting and sticking, it becomes easy to stick while releasing air at the sticking interface, and bubbles are less likely to be involved at the time of sticking.
以下に本発明の両面粘着フィルム及びそれを用いた情報表示画面用の保護部材を、その構成要素に基づいて、さらに詳しく説明する。 Below, the double-sided pressure-sensitive adhesive film of the present invention and the protective member for an information display screen using the same will be described in more detail based on the components.
(全体構成)
本発明の情報表示画面用の保護部材は、透明保護カバーと、基材フィルムの一方の面に、吸着層を積層し、もう一方の面にアクリル系粘着剤からなる粘着剤層を積層してなり、前記吸着層に貼り合わされたセパレータからなる両面粘着フィルムとを、前記粘着剤層を介して貼り合せた状態で提供されるものである。
(overall structure)
The protective member for the information display screen of the present invention is formed by laminating an adsorption layer on one side of a transparent protective cover and a base film, and laminating an adhesive layer made of an acrylic adhesive on the other side. The double-sided pressure-sensitive adhesive film composed of the separator bonded to the adsorption layer is provided in a state of being bonded via the pressure-sensitive adhesive layer.
(透明保護カバー)
本発明の情報表示画面用の保護部材の構成部材のうち、前記透明保護カバーは、ガラス板で波長が380〜780nmの領域の可視光の全光線透過率が85%以上のものを使用することが好ましい。全光線透過率が85%未満の場合には、画面から発せられた光が透明部材を透過しにくくなるので、視認性が低下するからである。
(Transparent protective cover)
Among the constituent members of the protective member for the information display screen of the present invention, the transparent protective cover is a glass plate having a visible light total light transmittance of 85% or more in the region of a wavelength of 380 to 780 nm. Is preferred. This is because, when the total light transmittance is less than 85%, the light emitted from the screen is difficult to transmit through the transparent member, so that the visibility is lowered.
(全光線透過率の測定方法)
ここでの全光線透過率は、JIS K 7105に準じ、積分球式濁度計(日本電色工業株式会社製、NDH2000)により測定した。
(Measurement method of total light transmittance)
The total light transmittance here was measured with an integrating sphere turbidimeter (NDH2000, manufactured by Nippon Denshoku Industries Co., Ltd.) according to JIS K 7105.
前記透明保護カバーの厚みは、硬さと断裁加工性の観点から100〜1,000μmの範囲であることが好ましい。前記透明保護カバーの厚みが100μmより小さいと、前記透明保護カバーを情報表示画面に貼着する際の作業性が低下する場合がある。一方、前記透明保護カバーの厚みが1,000μmを超えると、コストアップとなり、透過率が低下して視認性が低下する場合がある。 The thickness of the transparent protective cover is preferably in the range of 100 to 1,000 μm from the viewpoint of hardness and cutting processability. When the thickness of the transparent protective cover is smaller than 100 μm, workability when the transparent protective cover is stuck on the information display screen may be deteriorated. On the other hand, when the thickness of the transparent protective cover exceeds 1,000 μm, the cost increases, and the transmittance may decrease and the visibility may decrease.
前記透明保護カバーは、中心線表面粗さRaが5.0μm以下であることが好ましい。中心線表面粗さRaが5.0μmより大きいと、前記粘着剤層が塑性変形しても透明保護カバー表面の凹凸を打ち消しづらくなって、前記吸着層表面を前記保護部材の吸着層とディスプレイパネルの情報表示画面とを貼着させる際に、気泡の巻き込みが生じやすくなるからである。 The transparent protective cover preferably has a center line surface roughness Ra of 5.0 μm or less. When the center line surface roughness Ra is larger than 5.0 μm, it becomes difficult to cancel the irregularities on the surface of the transparent protective cover even if the pressure-sensitive adhesive layer is plastically deformed. This is because entrapment of bubbles is likely to occur when the information display screen is attached.
前記透明保護カバーには、場合により、光反射防止層を設けることができ、透明保護カバーの片面に光反射防止剤としてITO、SiO2、TiO2、ZnO2等の酸化金属の膜を形成する。このような膜の形成は、例えばITOなどをスパッタリングすることにより行っても良く、この方法によって光反射防止層を形成する場合には、透明性など信頼性が高いものが得られる。 In some cases, the transparent protective cover may be provided with a light reflection preventing layer, and a film of a metal oxide such as ITO, SiO 2 , TiO 2 , ZnO 2 or the like is formed on one side of the transparent protective cover as a light reflection preventing agent. . Such a film may be formed, for example, by sputtering ITO or the like. When the light reflection preventing layer is formed by this method, a highly reliable material such as transparency can be obtained.
また、光反射防止層の形成は、コストの点で好ましい方法として、例えばITO、SiO2、TiO2、ZnO2等の酸化金属の微粉末にアクリル系樹脂のバインダーを加え溶液化又はエマルジョン化し、これをグラビアコーター、スピンコーターなどで塗布するウエット法で形成しても良い。ウエット法における反射防止剤として使用する前記酸化金属の微粉末の粒径は、透視性の点から微細である程好ましく、10〜500nmとすることが好ましいが、この粒径とする場合には、分散性の悪さと二次凝集によって歩留まりが悪くなることから、粒径1.0μmより小さいものが好ましい。 In addition, the formation of the light antireflection layer is preferably performed in terms of cost. For example, a binder of an acrylic resin is added to a fine powder of metal oxide such as ITO, SiO 2 , TiO 2 , ZnO 2 to form a solution or an emulsion, You may form this by the wet method apply | coated with a gravure coater, a spin coater, etc. The particle diameter of the metal oxide fine powder used as an antireflection agent in the wet method is preferably as fine as possible from the viewpoint of transparency, and is preferably 10 to 500 nm. Particles with a particle size smaller than 1.0 μm are preferred because of poor dispersibility and poor yield due to secondary aggregation.
(両面粘着フィルム)
本発明の情報表示画面用の保護部材に用いる両面粘着フィルムは、基材フィルムの一方の面に、吸着層を積層し、もう一方の面にアクリル系粘着剤とイソシアネート系架橋剤を必須成分とする粘着剤層を積層してなり、前記吸着層にプラスチックフィルムからなるセパレータを貼り合わせたものであり、さらに前記粘着剤層に、ポリエステル系樹脂フィルムにシリコーン離型処理を施したカバーフィルムを貼り合わせた状態で提供されるものである。
(Double-sided adhesive film)
The double-sided pressure-sensitive adhesive film used for the protective member for the information display screen of the present invention has an adsorption layer laminated on one side of the base film, and an acrylic pressure-sensitive adhesive and an isocyanate-based crosslinking agent as essential components on the other side. It is made by laminating a pressure-sensitive adhesive layer, a plastic film separator is pasted on the adsorption layer, and a polyester resin film with a silicone release treatment is further pasted on the pressure-sensitive adhesive layer. It is provided in a combined state.
(基材フィルム)
本発明で使用する基材フィルムは、各種のプラスチックからなるフィルムであれば、特に限定されない。例えばポリオレフィン、ポリエステル、ポリアミド、ポリカーボネート、トリアセチルセルロース、フッ素樹脂、ポリフェニレンオキサイド、ポリイミド、ポリアミドイミド、アクリル系樹脂、ポリ塩化ビニル、ポリ塩化ビニリデン、ポリアクリロニトリル等よりなるフィルムが挙げられるが、これらに限定されるものではない。粘着剤層や吸着層の熱架橋時の取り扱い性、コストの面からポリエステルフィルムやポリカーボネートフィルムが好ましい。透明性の点では、ポリエステルフィルム、特にポリエチレンテレフタレートが好ましい。基材の厚みは、用途に応じて適宜選択すればよいが、通常5〜400μm、特に20〜250μmの範囲であるのが好ましい。
(Base film)
The base film used in the present invention is not particularly limited as long as it is a film made of various plastics. Examples include films made of polyolefin, polyester, polyamide, polycarbonate, triacetyl cellulose, fluororesin, polyphenylene oxide, polyimide, polyamideimide, acrylic resin, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, etc., but are not limited thereto. Is not to be done. A polyester film and a polycarbonate film are preferable from the viewpoints of handling property and cost at the time of thermal crosslinking of the pressure-sensitive adhesive layer and the adsorption layer. From the viewpoint of transparency, a polyester film, particularly polyethylene terephthalate is preferable. The thickness of the substrate may be appropriately selected according to the use, but is usually in the range of 5 to 400 μm, particularly 20 to 250 μm.
基材フィルムは、その表面をコロナ放電処理、紫外線照射処理、プラズマ処理、火炎処理したり、必要に応じてアンカー層等を設けてもよい。アンカー層等を積層する方法としては、製膜時に積層するいわゆるインライン法、または製膜したフィルムに積層するいわゆるオフライン法のいずれでもよい。 The surface of the base film may be subjected to corona discharge treatment, ultraviolet irradiation treatment, plasma treatment, flame treatment, or may be provided with an anchor layer or the like as necessary. As a method for laminating the anchor layer or the like, either a so-called in-line method for laminating at the time of film formation or a so-called off-line method for laminating on the formed film may be used.
(粘着剤層)
本発明の粘着剤層には、両面粘着フィルムの全光線透過率が80%以上になるような高透明粘着剤が得やすい等の理由から、各種アクリルモノマー及び/またはオリゴマーを共重合して得られるアクリル系共重合体と、イソシアネート系架橋剤を必須成分とするアクリル系粘着剤が好適に使用することができる。また、イソシアネート系架橋剤は、透明保護カバーとして使用されるガラス板の表面に存在する水酸基と良好な接着性が期待できる点で好適である。
(Adhesive layer)
The pressure-sensitive adhesive layer of the present invention is obtained by copolymerizing various acrylic monomers and / or oligomers for the reason that it is easy to obtain a highly transparent pressure-sensitive adhesive having a total light transmittance of 80% or more of the double-sided pressure-sensitive adhesive film. An acrylic pressure-sensitive adhesive containing an acrylic copolymer and an isocyanate-based crosslinking agent as essential components can be suitably used. Moreover, an isocyanate type crosslinking agent is suitable at the point which can anticipate the hydroxyl group which exists on the surface of the glass plate used as a transparent protective cover, and favorable adhesiveness.
前記アクリル系共重合体としては、アクリル酸エステル及び/またはメタクリル酸エステルに水酸基を持つアクリル酸化合物や水酸基を持つメタクリル酸化合物のほか、酢酸ビニル、ビニルエーテル、スチレン、アクリロニトリル、メタクリロニトリルなどのビニル基含有化合物や、アクリル酸、メタクリル酸、イタコン酸、アクリル酸プロピレングリコール、アクリルアミド、メタクリルアミド、メタクリル酸ジメチルアミノエチル、メタクリル酸−tert−ブチルアミノエチル等の化合物を必要に応じて共重合したものが用いられる。 Examples of the acrylic copolymer include acrylic acid compounds having hydroxyl groups in acrylates and / or methacrylic acid esters and methacrylic acid compounds having hydroxyl groups, as well as vinyl acetate, vinyl ether, styrene, acrylonitrile, methacrylonitrile, and other vinyls. A copolymer containing a group-containing compound or a compound such as acrylic acid, methacrylic acid, itaconic acid, propylene glycol acrylate, acrylamide, methacrylamide, dimethylaminoethyl methacrylate, or tert-butylaminoethyl methacrylate as required. Is used.
前記アクリル酸エステルとしては、例えばアクリル酸メチル、アクリル酸エチル、アクリル酸ブチル、アクリル酸−2−エチルヘキシル、アクリル酸イソブチル、アクリル酸−tert−ブチル、アクリル酸イソオクチル、アクリル酸イソノニル、アクリル酸ラウリル、アクリル酸ステアリル、アクリル酸イソステアリル、アクリル酸イソボニル、アクリル酸アミル、アクリル酸シクロヘキシル、アクリル酸ベンジル等が挙げられるが、これらに限定されるものではない。またこれらの化合物は単独でも、また2種以上を使用してもよい。 Examples of the acrylate ester include methyl acrylate, ethyl acrylate, butyl acrylate, -2-ethylhexyl acrylate, isobutyl acrylate, tert-butyl acrylate, isooctyl acrylate, isononyl acrylate, lauryl acrylate, Examples include, but are not limited to, stearyl acrylate, isostearyl acrylate, isobonyl acrylate, amyl acrylate, cyclohexyl acrylate, benzyl acrylate, and the like. These compounds may be used alone or in combination of two or more.
前記メタクリル酸エステルとしては、例えばメタクリル酸メチル、メタクリル酸エチル、メタクリル酸ラウリル、メタクリル酸トリデシル、メタクリル酸ステアリル、メタクリル酸ブチル、メタクリル酸−2−エチルヘキシル、メタクリル酸シクロヘキシル、メタクリル酸ベンジル、メタクリル酸フェニル、メタクリル酸イソボニル、メタクリル酸グリシジル、メタクリル酸アリル等が挙げられるが、これらに限定されるものではない。またこれらの化合物は単独でも、また2種以上を使用してもよい。 Examples of the methacrylic acid ester include methyl methacrylate, ethyl methacrylate, lauryl methacrylate, tridecyl methacrylate, stearyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, and phenyl methacrylate. , Isobonyl methacrylate, glycidyl methacrylate, allyl methacrylate, and the like, but are not limited thereto. These compounds may be used alone or in combination of two or more.
前記の水酸基を持つアクリル酸化合物としては、例えばアクリル酸ヒドロキシルエチル、アクリル酸ヒドロキシブチル、アクリル酸ヒドロキシプロピル、アクリル酸ヒドロキシヘキシル等のアクリル酸エステルが挙げられるが、これらに限定されるものではない。またこれらの化合物は単独でも、また2種以上を使用してもよい。 Examples of the acrylic acid compound having a hydroxyl group include, but are not limited to, acrylic esters such as hydroxylethyl acrylate, hydroxybutyl acrylate, hydroxypropyl acrylate, and hydroxyhexyl acrylate. These compounds may be used alone or in combination of two or more.
前記の水酸基を持つメタクリル酸化合物としては、メタクリル酸ヒドロキシルエチル、メタクリル酸ヒドロキシブチル、メタクリル酸ヒドロキシプロピルメタクリル酸ヒドロキシメタクリル酸ヒドロキシヘキシル、メタクリル酸メトキシエチル、メタクリル酸エトキシエチル等のメタクリル酸エステルが挙げられるが、これらに限定されるものではない。またこれらの化合物は単独でも、また2種以上を使用してもよい。 Examples of the methacrylic acid compound having a hydroxyl group include methacrylate esters such as hydroxylethyl methacrylate, hydroxybutyl methacrylate, hydroxypropyl methacrylate, hydroxyhexyl methacrylate, methoxyethyl methacrylate, and ethoxyethyl methacrylate. However, it is not limited to these. These compounds may be used alone or in combination of two or more.
前記アクリル系粘着剤に用いられるアクリル系共重合体としては、重量平均分子量が10万〜100万の範囲内のものが好ましく用いられる。重量平均分子量が10万より小さいと粘着力が高くなり、粘着剤層と貼合されたカバーフィルムとの剥離が困難になるといった不具合が発生する。また、重量平均分子量が100万を超えると溶液粘度が高くなり、塗工時に平滑な粘着剤塗工外観が得難い問題がある。また、このアクリル系共重合体のガラス転移点(Tg)は、−20℃以下のものが好ましく使用できる。−20℃よりTgが高いと粘着剤が硬くなり、透明保護カバーに対して適度な粘着力が得られなくなる。 As the acrylic copolymer used for the acrylic pressure-sensitive adhesive, those having a weight average molecular weight in the range of 100,000 to 1,000,000 are preferably used. When the weight average molecular weight is less than 100,000, the adhesive strength is increased, which causes a problem that it is difficult to separate the adhesive layer from the bonded cover film. Moreover, when a weight average molecular weight exceeds 1 million, solution viscosity will become high and there exists a problem that it is difficult to obtain the smooth adhesive coating external appearance at the time of coating. The glass transition point (Tg) of this acrylic copolymer is preferably -20 ° C or lower. When Tg is higher than −20 ° C., the pressure-sensitive adhesive becomes hard, and an appropriate pressure-sensitive adhesive force cannot be obtained for the transparent protective cover.
前記イソシアネート系架橋剤としては、例えば、トリレンジイソシアネート、ジフェニルメタンジイソシアネート、ナフタレンジイソシアネート、キシリレンジイソシアネート、テトラメチルキシリレンジイソシアネート等の芳香族ジイソシアネートや、ブチレンジイソシアネート、ヘキサメチレンジイソシアネート、2,2,4-トリメチルヘキサメチレンジイソシアネート等の脂肪族ジイソシアネート、または1,4−シクロヘキサンジイソシアネート、4,4‘−ジシクロヘキシルメタンジイソシアネート、メチルシクロヘキサンジイソシアネート、1,2−ビス(イソシアナトメチル)シクロヘキサン、ノルボルネンジイソシアネート等の脂環族ジイソシアネートが挙げられる。なかでも脂肪族ジイソシアネートが、無黄変型であることや粘着剤の適度な硬度が得られやすい点で好適に用いられる。なお、イソシアネート系架橋剤の種類は必ずしもこれらに限定されるものではない。 Examples of the isocyanate-based crosslinking agent include aromatic diisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, xylylene diisocyanate, and tetramethylxylylene diisocyanate, butylene diisocyanate, hexamethylene diisocyanate, and 2,2,4-trimethyl. Aliphatic diisocyanates such as hexamethylene diisocyanate, or alicyclic diisocyanates such as 1,4-cyclohexane diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, methylcyclohexane diisocyanate, 1,2-bis (isocyanatomethyl) cyclohexane, norbornene diisocyanate Is mentioned. Of these, aliphatic diisocyanates are preferably used in that they are non-yellowing and that an appropriate hardness of the pressure-sensitive adhesive can be easily obtained. In addition, the kind of isocyanate type crosslinking agent is not necessarily limited to these.
前記イソシアネート系架橋剤の添加量としては、粘着剤100重量%中の0.05〜2.0重量%の割合が好適で、より好ましい添加量は0.10〜1.0重量%である。添加量が0.05重量%未満の場合は、硬化が不十分になり前記粘着剤層が柔らかくなりすぎて表面の平滑性を保てなくなるため、前記粘着剤層に透明保護カバーを貼り合せた保護部材の状態で前記吸着層の表面を平滑に保つことができなくなり、情報表示画面に前記保護部材の吸着層を貼り付ける際に気泡の巻き込みが生じてしまう。添加量が2.0重量%を超えた場合は、本発明の粘着剤層としては硬くなりすぎて、透明保護カバー表面の凹凸や、前記吸着層表面の凹凸を打ち消す様に粘着剤層が塑性変形できなくなる。その結果、前記粘着剤層に透明保護カバーを粘着した保護部材の状態で前記吸着層の表面を平滑に保つことができなくなり、情報表示画面に前記保護部材の吸着層を貼り付ける際に気泡の巻き込みが生じてしまう。 The addition amount of the isocyanate-based crosslinking agent is preferably 0.05 to 2.0% by weight in 100% by weight of the pressure-sensitive adhesive, and more preferably 0.10 to 1.0% by weight. When the addition amount is less than 0.05% by weight, the curing becomes insufficient and the pressure-sensitive adhesive layer becomes too soft to maintain the surface smoothness. Therefore, a transparent protective cover is bonded to the pressure-sensitive adhesive layer. The surface of the adsorption layer cannot be kept smooth in the state of the protection member, and bubbles are involved when the adsorption layer of the protection member is attached to the information display screen. When the added amount exceeds 2.0% by weight, the pressure-sensitive adhesive layer of the present invention becomes too hard, and the pressure-sensitive adhesive layer is plastic so as to cancel out the irregularities on the surface of the transparent protective cover and the irregularities on the surface of the adsorption layer. Can not be deformed. As a result, the surface of the adsorption layer cannot be kept smooth in the state of the protective member in which the transparent protective cover is adhered to the pressure-sensitive adhesive layer, and when the adsorption layer of the protective member is attached to the information display screen, Entrainment will occur.
(粘着剤層のゲル分率の測定方法)
本発明の両面粘着フィルムを構成する粘着剤層のゲル分率は、所定の大きさにカットした基材上に粘着剤層のみが設けられた粘着フィルムを30分間トルエンに浸漬させ、浸漬後45℃で24時間乾燥した後に浸漬後の粘着剤層の重量を測定し、あらかじめ測定しておいた浸漬前の粘着剤層の重量との重量比として求められる。
(Method for measuring the gel fraction of the adhesive layer)
The gel fraction of the pressure-sensitive adhesive layer constituting the double-sided pressure-sensitive adhesive film of the present invention is such that the pressure-sensitive adhesive film provided with only the pressure-sensitive adhesive layer on a base material cut to a predetermined size is immersed in toluene for 30 minutes, and then immersed 45 The weight of the pressure-sensitive adhesive layer after immersion is measured after drying for 24 hours at a temperature, and the weight ratio with the weight of the pressure-sensitive adhesive layer before immersion that has been measured in advance is obtained.
(粘着剤層表面のマルテンス硬度の測定方法)
本発明の両面粘着フィルムを構成する粘着剤層表面のマルテンス硬度の測定は、超微小押し込み硬さ試験機(株式会社エリオニクス製 ENT―2100)を使用して下記条件にて行った。
使用圧子:球状圧子(半径200μm)
最大荷重:10μN
荷重時間:10sec
保持時間:5sec
徐荷時間:10sec
(Measurement method of Martens hardness of the adhesive layer surface)
The measurement of the Martens hardness on the surface of the pressure-sensitive adhesive layer constituting the double-sided pressure-sensitive adhesive film of the present invention was performed using an ultra-fine indentation hardness tester (ENT-2100 manufactured by Elionix Co., Ltd.) under the following conditions.
Working indenter: Spherical indenter (radius 200 μm)
Maximum load: 10μN
Loading time: 10 sec
Holding time: 5 sec
Unloading time: 10 sec
前記粘着剤の物性としては、前記粘着剤層表面のマルテンス硬度が8〜15mN/mm2であることが好ましい。マルテンス硬度が8mN/mm2未満の場合、前記粘着剤層表面が柔らかすぎて容易に変形できる様になってしまい、前記粘着剤層表面の平滑性が保ちにくくなって、前記粘着剤層に透明保護カバーを貼り合せた保護部材の状態で前記吸着層の表面を平滑に保つことができなくなり、情報表示画面に前記保護部材の吸着層を貼り付ける際に気泡の巻き込みが生じてしまう。また、マルテンス硬度が15mN/mm2より大きい場合は、両面粘着フィルム自体の柔軟性が低下して、透明保護カバー表面の凹凸や、前記吸着層表面の凹凸を打ち消す様に粘着剤層が塑性変形できなくなる。その結果、前記粘着剤層に透明保護カバーを貼り合せた、保護部材の状態で前記吸着層の表面を平滑に保つことができなくなり、情報表示画面に前記保護部材の吸着層を貼り付ける際に気泡の巻き込みが生じてしまう。 As physical properties of the pressure-sensitive adhesive, it is preferable that the Martens hardness of the surface of the pressure-sensitive adhesive layer is 8 to 15 mN / mm 2 . When the Martens hardness is less than 8 mN / mm 2 , the pressure-sensitive adhesive layer surface is too soft and can be easily deformed, and it becomes difficult to maintain the smoothness of the pressure-sensitive adhesive layer surface. The surface of the adsorbing layer cannot be kept smooth in the state of the protective member with the protective cover attached, and bubbles are involved when the adsorbing layer of the protective member is attached to the information display screen. When the Martens hardness is greater than 15 mN / mm 2, the flexibility of the double-sided adhesive film itself is reduced, and the adhesive layer is plastically deformed so as to cancel the unevenness on the surface of the transparent protective cover and the unevenness on the surface of the adsorption layer. become unable. As a result, when the transparent protective cover is bonded to the pressure-sensitive adhesive layer, the surface of the adsorption layer cannot be kept smooth in the state of the protection member, and when the adsorption layer of the protection member is attached to the information display screen Bubble entrainment occurs.
前記粘着剤層のゲル分率は35%〜80%である事が、粘着剤層に透明保護カバーを貼り合せた保護部材の状態で吸着層表面を平滑に保ち、情報表示画面に前記保護部材を貼り合わせる際に気泡の巻き込みを防止できる点で望ましい。ゲル分率が35%未満の場合は、前記粘着剤層の架橋密度が低くなりすぎて粘着剤層の凝集力が低下し、前記透明保護カバーと貼り合わせた保護部材の状態で透明保護カバーと両面粘着フィルムを固定することが困難になる(ずれる)。ゲル分率が80%を越えた場合は、架橋密度が高くなりすぎて粘着剤層の凝集力が上がり、前記透明保護カバーに対する十分な粘着力が得られなくなる。 The gel fraction of the pressure-sensitive adhesive layer is 35% to 80%, and the surface of the adsorption layer is kept smooth in the state of a protective member in which a transparent protective cover is bonded to the pressure-sensitive adhesive layer, and the protective member is displayed on the information display screen. It is desirable in that it can prevent entrainment of bubbles when laminating. When the gel fraction is less than 35%, the cross-linking density of the pressure-sensitive adhesive layer becomes too low, and the cohesive force of the pressure-sensitive adhesive layer decreases, and in the state of the protective member bonded to the transparent protective cover, It becomes difficult to shift the double-sided adhesive film. When the gel fraction exceeds 80%, the crosslinking density becomes too high, the cohesive force of the pressure-sensitive adhesive layer is increased, and sufficient adhesive force to the transparent protective cover cannot be obtained.
本発明における両面粘着フィルムの粘着剤層の厚みは、5〜30μmとすることが適当である。粘着剤層の厚みが5μm未満の場合、粘着力が低下し前記透明保護カバーに対して適度な粘着力が得られなくなる。また、粘着剤層の厚みが30μmを超えた場合は、粘着剤表面の平滑性を高い状態に保つことが困難になり、粘着剤層と透明保護カバーを貼着させて保護部材となした際に、反対側の吸着層表面を平滑に保つことができなくなり、情報表示画面に前記保護部材の吸着層を貼り付ける際に気泡の巻き込みが生じてしまう。 The thickness of the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive film in the present invention is suitably 5 to 30 μm. When the thickness of the pressure-sensitive adhesive layer is less than 5 μm, the pressure-sensitive adhesive force is lowered and an appropriate pressure-sensitive adhesive force cannot be obtained with respect to the transparent protective cover. In addition, when the thickness of the pressure-sensitive adhesive layer exceeds 30 μm, it becomes difficult to maintain the smoothness of the pressure-sensitive adhesive surface in a high state, and when the pressure-sensitive adhesive layer and the transparent protective cover are adhered to form a protective member In addition, the surface of the adsorption layer on the opposite side cannot be kept smooth, and bubbles are involved when the adsorption layer of the protective member is attached to the information display screen.
ここでの粘着剤層の形成方法としては、有機溶剤に溶解し粘度を調整した粘着剤を塗布する方法や水に分散し塗布する方法等の公知の方法を用いることができるが、架橋型アクリル系粘着剤の形成方法としては、有機溶剤に溶解し粘度を調整した粘着剤を塗布する方法が一般的である。 As the method for forming the pressure-sensitive adhesive layer, a known method such as a method of applying a pressure-sensitive adhesive dissolved in an organic solvent or a method of dispersing and applying in water can be used. As a method for forming a pressure-sensitive adhesive, a method of applying a pressure-sensitive adhesive dissolved in an organic solvent and adjusting the viscosity is generally used.
なお、前記粘着剤の希釈剤としては特に制限無く用いることができる。例えば、アセトン、メチルエチルケトン、ベンゼン、トルエン、酢酸エチルなどの有機溶剤が挙げられるが、これらに限定されるものではない。 In addition, it can use without a restriction | limiting especially as a diluent of the said adhesive. Examples include organic solvents such as acetone, methyl ethyl ketone, benzene, toluene, and ethyl acetate, but are not limited thereto.
本発明の粘着剤層のコーティング法としては、コンマナイフコーター、ダイコーター、リーバースコーターなどが挙げられる。なお、気泡混入防止の点からからダイコーターが好適である。 Examples of the coating method for the pressure-sensitive adhesive layer of the present invention include a comma knife coater, a die coater, and a reverse coater. A die coater is preferable from the viewpoint of preventing air bubbles from mixing.
(カバーフィルム)
本発明の両面粘着フィルムには、粘着剤層面にポリエステル系樹脂フィルムをカバーフィルムとして貼り合わせることが好ましい。カバーフィルムの中心線表面粗さは0.20μm以下であることが好ましい。より好ましくは、カバーフィルムの中心線表面粗さが0.10μm以下であることが好ましい。中心線表面粗さが0.20μmより大きくなるとカバーフィルム表面の粗さが粘着剤層に転写し、さらに転写してできた粘着剤層表面の凹凸が、透明保護カバーと粘着剤層を貼着して保護部材となした際に、吸着層表面に影響を与えて粘着剤層の塑性変形では打ち消せない凹凸を吸着剤表面に生じさせてしまい、前記保護部材をディスプレイパネルの情報表示画面へ貼り付けた際に、気泡の混入が発生しやすくなる。
(Cover film)
In the double-sided pressure-sensitive adhesive film of the present invention, a polyester resin film is preferably bonded to the pressure-sensitive adhesive layer surface as a cover film. The centerline surface roughness of the cover film is preferably 0.20 μm or less. More preferably, the center line surface roughness of the cover film is 0.10 μm or less. When the center line surface roughness is larger than 0.20 μm, the roughness of the cover film surface is transferred to the adhesive layer, and the unevenness on the surface of the adhesive layer formed by the transfer pastes the transparent protective cover and the adhesive layer. When the protective member is formed, the surface of the adsorbent layer is affected to cause unevenness on the surface of the adsorbent that cannot be canceled by the plastic deformation of the adhesive layer. When pasted, bubbles are likely to be mixed.
カバーフィルムとして使用されるポリエステル系樹脂フィルムとしては、寸法安定性、透明性、硬さの点で、二軸延伸ポリエステル系フィルムの使用が好ましい。カバーフィルムとなるポリエステル系樹脂フィルムの厚みは10〜200μmの範囲、硬さと断裁加工性から25〜100μmの範囲のものが好ましい。前記の厚みが10μmより薄いとフィルム強度が不足し、カバーフィルム剥離時に破れたり、両面粘着フィルムに貼り合わせる際に、シワが入り易い等の問題が発生する。また、前記厚みが200μmより厚いと、フィルム自体が高価になる等の問題が発生する。 The polyester resin film used as the cover film is preferably a biaxially stretched polyester film in terms of dimensional stability, transparency and hardness. The polyester resin film serving as the cover film preferably has a thickness in the range of 10 to 200 [mu] m, and in the range of 25 to 100 [mu] m in view of hardness and cutting processability. When the thickness is less than 10 μm, the film strength is insufficient, and problems such as tearing when the cover film is peeled off and wrinkling easily occur when pasting to a double-sided adhesive film. On the other hand, when the thickness is greater than 200 μm, problems such as an expensive film itself occur.
また、本発明の両面粘着フィルムを前記の透明保護カバーに粘着剤層を介して貼着する場合には、カバーフィルムを剥離して使用するものであり、前記粘着剤層からカバーフィルムを剥離する際の剥離力を調整するために、前記カバーフィルムの粘着剤層を貼り付ける面に、シリコーン系剥離剤を塗布しておくことが好ましい。 Moreover, when sticking the double-sided adhesive film of this invention to the said transparent protective cover through an adhesive layer, it peels and uses a cover film, and peels a cover film from the said adhesive layer. In order to adjust the peeling force at the time, it is preferable to apply a silicone release agent to the surface of the cover film to which the adhesive layer is attached.
(吸着層)
本発明の吸着層に用いるシリコーン樹脂の性状としては、透明性が高く、ゴムのような柔軟性を持っていて被着体の表面に対しても、吸着層の面が被着体表面に沿うことが求められる。さらに剥離の際には、小さい剥離力で容易に剥離できることが求められる。また、少なくとも厚み10μm以上で、目付け加工の方法を用いることなく塗布及び加熱処理だけで架橋吸着層を設けるためには、シリコーン組成物の硬化反応に際して、白金触媒等のもとで、150℃以下の低温短時間で深部まで架橋し、透明で耐熱性、圧縮永久歪み特性に優れかつ低粘度で液状タイプである、1分子中に2個以上のアルケニル基を有するポリオルガノシロキサンと架橋剤としてSiH基を有するオルガノハイドロジェンポリシロキサンとの付加反応により熱架橋する付加反応型液状シリコーン組成物の使用が好ましい。
(Adsorption layer)
The properties of the silicone resin used in the adsorption layer of the present invention are high in transparency, have flexibility like rubber, and the surface of the adsorption layer is also along the adherend surface with respect to the adherend surface. Is required. Furthermore, when peeling, it is required to be easily peelable with a small peeling force. In addition, in order to provide a crosslinked adsorption layer with a thickness of at least 10 μm and only by coating and heat treatment without using a basis weight processing method, 150 ° C. or less under a platinum catalyst or the like during the curing reaction of the silicone composition A polyorganosiloxane having two or more alkenyl groups in one molecule and SiH as a crosslinking agent, which is crosslinked to a deep portion in a short time at a low temperature, transparent, excellent in heat resistance, compression set, low viscosity and liquid type. It is preferable to use an addition reaction type liquid silicone composition which is thermally crosslinked by addition reaction with an organohydrogenpolysiloxane having a group.
1分子中に2個以上のアルケニル基を有するジオルガノポリシロキサンとしては、両末端にのみビニル基を有する直鎖状ジオルガノポリシロキサンと、両末端及び側鎖にビニル基を有する直鎖状ジオルガノポリシロキサンと、末端にのみビニル基を有する分岐状ジオルガノポリシロキサンと、末端及び側鎖にビニル基を有する分岐状ジオルガノポリシロキサンとから選ばれる少なくとも1種を用いると良い。 Diorganopolysiloxanes having two or more alkenyl groups in one molecule include linear diorganopolysiloxanes having vinyl groups only at both ends and linear diorganopolysiloxanes having vinyl groups at both ends and side chains. It is preferable to use at least one selected from organopolysiloxane, branched diorganopolysiloxane having a vinyl group only at the terminal, and branched diorganopolysiloxane having a vinyl group at the terminal and side chain.
これらのジオルガノポリシロキサンの1形態としては、両末端にのみビニル基を有する直鎖状ジオルガノポリシロキサンで、下記一般式(化1)で表わされる化合物である。 One form of these diorganopolysiloxanes is a linear diorganopolysiloxane having vinyl groups only at both ends, and is a compound represented by the following general formula (Formula 1).
(式中Rは下記の有機基、nは整数を表す。) (In the formula, R represents the following organic group, and n represents an integer.)
(式中Rは下記の有機基、n、mは整数を表す。) (In the formula, R represents the following organic group, and n and m represent integers.)
このビニル基以外のケイ素原子に結合した有機基(R)は異種でも同種でもよいが、具体例としてはメチル基、エチル基、プロピル基などのアルキル基、フェニル基、トリル基、などのアリール基、又はこれらの基の炭素原子に結合した水素原子の一部または全部をハロゲン原子、シアノ基などで置換した同種、または異種の非置換または置換の脂肪族不飽和基を除く1価炭化水素基で、好ましくはその少なくとも50モル%がメチル基であるものなどが挙げられるが、このジオルガノポリシロキサンは単独でも2種以上の混合物であってもよい。 The organic group (R) bonded to the silicon atom other than the vinyl group may be different or of the same type. Specific examples include alkyl groups such as methyl, ethyl and propyl groups, and aryl groups such as phenyl and tolyl groups. Or a monovalent hydrocarbon group excluding the same or different kinds of unsubstituted or substituted aliphatic unsaturated groups in which some or all of the hydrogen atoms bonded to the carbon atoms of these groups are substituted with halogen atoms, cyano groups, or the like Preferably, at least 50 mol% of them is a methyl group, and the diorganopolysiloxane may be used alone or in a mixture of two or more.
両末端および側鎖にビニル基を有する直鎖状ジオルガノポリシロキサンは、上記一般式(化1)中のRの一部がビニル基である化合物である。末端にのみビニル基を有する分岐状ポリオルガノシロキサンは、上記一般式(化2)で表わされる化合物である。末端及び側鎖にビニル基を有する分岐状ポリオルガノシロキサンは、上記一般式(化2)中のRの一部がビニル基である化合物である。 The linear diorganopolysiloxane having vinyl groups at both ends and side chains is a compound in which a part of R in the above general formula (Formula 1) is a vinyl group. The branched polyorganosiloxane having a vinyl group only at the terminal is a compound represented by the above general formula (Formula 2). The branched polyorganosiloxane having vinyl groups at the terminals and side chains is a compound in which a part of R in the above general formula (Formula 2) is a vinyl group.
1分子中に2個以上のアルケニル基を有するジオルガノポリシロキサンの重量平均分子量としては、20,000〜700,000の範囲のものが好ましい。前記のジオルガノポリシロキサンの重量平均分子量が20,000未満であると、硬化性が低下したり、被着体への粘着力が低下してしまう。また、700,000を超えてしまうと、組成物の粘度が高くなりすぎて製造時の撹拌が困難になる。 The diorganopolysiloxane having two or more alkenyl groups in one molecule preferably has a weight average molecular weight in the range of 20,000 to 700,000. When the weight average molecular weight of the diorganopolysiloxane is less than 20,000, the curability is lowered or the adhesive force to the adherend is lowered. Moreover, when it exceeds 700,000, the viscosity of a composition will become high too much and stirring at the time of manufacture will become difficult.
ここで架橋反応に用いる架橋剤の例として、オルガノハイドロジェンポリシロキサンが挙げられる。前記オルガノハイドロジェンポリシロキサンは、1分子中にケイ素原子に結合した水素原子を少なくとも3個有するものであるが、実用上からは分子中に2個の≡SiH結合を有するものをその全量の50重量%までとし、残余を分子中に少なくとも3個の≡SiH結合を含むものとすることがよい。分子の形状としては、直鎖状、分岐状、環状のものを使用できる。 Here, an example of the crosslinking agent used for the crosslinking reaction is organohydrogenpolysiloxane. The organohydrogenpolysiloxane has at least three hydrogen atoms bonded to silicon atoms in one molecule, but from a practical point of view, it has a total amount of 50 having two ≡SiH bonds in the molecule. It is preferable that the content is up to wt%, and the remainder includes at least three ≡SiH bonds in the molecule. The molecular shape may be linear, branched or cyclic.
前記アルケニル基を有するジオルガノポリシロキサン中のアルケニル基(A)に対する、オルガノハイドロジェンポリシロキサン中のSiH基(B)のモル比(A)/(B)が1.0〜2.0の範囲となるように配合することが好ましい。モル比(A)/(B)が1.0未満では架橋密度が不足して、これに伴い凝集力、保持力が低くなってしまうことがあり、逆に2.0を超えると架橋密度が高くなり、適度な粘着力、及びタック性が得られず、気泡の混入も発生しやすくなる。 The molar ratio (A) / (B) of the SiH group (B) in the organohydrogenpolysiloxane to the alkenyl group (A) in the diorganopolysiloxane having the alkenyl group is in the range of 1.0 to 2.0. It is preferable to mix | blend so that it may become. If the molar ratio (A) / (B) is less than 1.0, the crosslink density is insufficient, and the cohesive force and holding power may decrease accordingly. It becomes high, moderate adhesive force and tackiness cannot be obtained, and bubbles are likely to be mixed.
架橋反応に用いる付加反応触媒は、塩化白金酸、塩化白金酸のアルコール溶液、塩化白金酸とアルコールとの反応物、塩化白金酸とオレフィン化合物との反応物、塩化白金酸とビニル基含有シロキサンとの反応物、白金−オレフィン錯体、白金−ビニル基含有シロキサン錯体、ロジウム錯体、ルテニウム錯体などが挙げられる。また、これらのものをイソプロパノール、トルエンなどの溶剤や、シリコーンオイルなどに溶解、分散させたものを用いてもよい。架橋反応した吸着層は、シリコーンゴムのような柔軟性を持ったものとなり、この柔軟性が被着体との密着を容易にさせるものである。 The addition reaction catalyst used for the cross-linking reaction is chloroplatinic acid, an alcohol solution of chloroplatinic acid, a reaction product of chloroplatinic acid and alcohol, a reaction product of chloroplatinic acid and an olefin compound, chloroplatinic acid and a vinyl group-containing siloxane, Reaction products, platinum-olefin complexes, platinum-vinyl group-containing siloxane complexes, rhodium complexes, ruthenium complexes, and the like. Moreover, you may use what melt | dissolved and disperse | distributed these things to solvents, such as isopropanol and toluene, or silicone oil. The adsorption layer subjected to the crosslinking reaction has flexibility such as silicone rubber, and this flexibility facilitates the close contact with the adherend.
添加量はシリコーン組成物の合計100重量部に対し、貴金属分として5〜2,000ppm、特に10〜500ppmとすることが好ましい。5ppm未満では硬化性が低下し、架橋密度が低くなり、保持力が低下することがあり、2,000ppmを超えると処理浴の使用可能時間が短くなる場合がある。 The addition amount is preferably 5 to 2,000 ppm, particularly preferably 10 to 500 ppm as a noble metal component with respect to a total of 100 parts by weight of the silicone composition. If it is less than 5 ppm, the curability is lowered, the crosslinking density is lowered and the holding power may be lowered, and if it exceeds 2,000 ppm, the usable time of the treatment bath may be shortened.
本発明に係るシリコーンの市販品の形状は、無溶剤型、溶剤型、エマルション型があるが、いずれの型も使用できる。なかでも、無溶剤型は、溶剤を使用しないため、安全性、衛生性、大気汚染の面で非常に利点がある。但し、無溶剤型であっても、所望の膜厚を得るための粘度調節のために、必要に応じてトルエン、キシレンなどの芳香族炭化水素系溶剤、ヘキサン、ヘプタン、オクタン、イソパラフィンなどの脂肪族炭化水素系溶剤、メチルエチルケトン、メチルイソブチルケトンなどのケトン系溶剤、酢酸エチル、酢酸イソブチルなどのエステル系溶剤、ジイソプロピルエーテル、1、4−ジオキサンなどのエーテル系溶剤、またはこれらの混合溶剤などが使用される。 The shape of the commercially available silicone product according to the present invention includes a solventless type, a solvent type, and an emulsion type, but any type can be used. Especially, since the solventless type does not use a solvent, it is very advantageous in terms of safety, hygiene, and air pollution. However, even in the solventless type, if necessary, an aromatic hydrocarbon solvent such as toluene or xylene, or a fat such as hexane, heptane, octane or isoparaffin is used to adjust the viscosity to obtain a desired film thickness. Use of aromatic hydrocarbon solvents, ketone solvents such as methyl ethyl ketone and methyl isobutyl ketone, ester solvents such as ethyl acetate and isobutyl acetate, ether solvents such as diisopropyl ether and 1,4-dioxane, or mixed solvents thereof Is done.
添加量はシリコーン組成物の合計100重量部に対し、20〜1,000重量部、特に25〜900重量部とすることが好ましい。20重量部未満では、吸着層と基材の密着性が低下して剥離する場合があり、1,000重量部を超えると、シリコーン組成物の塗工液の粘度が低くなりすぎるので、塗工後から硬化までの間に、塗工された吸着層が一部流動し、吸着層表面の平滑性が低下してしまう。 The addition amount is preferably 20 to 1,000 parts by weight, particularly 25 to 900 parts by weight, based on 100 parts by weight of the total silicone composition. If it is less than 20 parts by weight, the adhesion between the adsorbing layer and the substrate may be reduced and peeled off, and if it exceeds 1,000 parts by weight, the viscosity of the coating liquid of the silicone composition becomes too low. During the period after the curing, the coated adsorption layer partially flows, and the smoothness of the adsorption layer surface is lowered.
前述のごとく、吸着層の性状としては、ゴムのような柔軟性を持っていて被着体への貼着時に被着体の表面の凹凸に追従して密着力を確保することが求められる。そして、例えば前記情報表示画面の保護部材として両面粘着フィルムを使用する場合、吸着層の膜厚は、被着体に対する吸着層の密着面方向の剪断力を確保するために少なくとも10μm以上、通常は10〜50μmが好ましい。本発明の場合、気泡の混入を防止し、気泡吸収性を確保するために、吸着層の厚みとしては、20〜50μmであることがより好ましい。10μm未満であると被着体に対する保護部材の密着面方向の剪断力が確保できず、特に長期貼り付け時には、保護部材が被着体から剥がれ易い。また、吸着層の厚みが50μmを超える場合には、シリコーン組成物の使用量が多くなり、両面粘着フィルムの製造コストの上昇を招いてしまう。 As described above, the properties of the adsorbing layer are required to have a softness like rubber and follow the irregularities on the surface of the adherend to ensure adhesion when adhered to the adherend. And, for example, when using a double-sided adhesive film as the protective member for the information display screen, the film thickness of the adsorption layer is at least 10 μm or more in order to ensure the shearing force in the adhesion surface direction of the adsorption layer with respect to the adherend. 10-50 micrometers is preferable. In the case of the present invention, the thickness of the adsorption layer is more preferably 20 to 50 μm in order to prevent air bubbles from being mixed and to ensure air bubble absorbability. When the thickness is less than 10 μm, the shearing force in the adhesion surface direction of the protective member with respect to the adherend cannot be secured, and the protective member is easily peeled off from the adherend, particularly when applied for a long time. Moreover, when the thickness of an adsorption layer exceeds 50 micrometers, the usage-amount of a silicone composition will increase and it will raise the manufacturing cost of a double-sided adhesive film.
(アンカー層)
本発明においては、基材フィルムと吸着層との接着力の向上、および被着体への保護部材の貼着後、前記保護部材を再剥離する際に、前記吸着層と基材フィルム間で剥離することなく、被着体からスムーズに剥離できることを目的として、前記基材フィルムと吸着層との間にアンカー層を設けてもよい。
(Anchor layer)
In the present invention, when the protective member is peeled again after improving the adhesive force between the base film and the adsorbing layer and attaching the protective member to the adherend, between the adsorbing layer and the base film. An anchor layer may be provided between the base film and the adsorption layer for the purpose of smoothly peeling from the adherend without peeling.
アンカー層の材料としては、ポリエステル系樹脂、アクリル系樹脂、ウレタン系樹脂等が挙げられる。中でもポリエステル系樹脂またはアクリル系樹脂が、帯電防止性や被膜特性の観点から好ましい。 Examples of the material for the anchor layer include polyester resins, acrylic resins, and urethane resins. Of these, polyester resins or acrylic resins are preferable from the viewpoint of antistatic properties and coating properties.
アンカー層塗工液、吸着層塗工液の塗工方法としては、3本オフセットグラビアコーターや5本ロールコーターに代表される多段ロールコーター、ダイレクトグラビアコーター、バーコーター、エアナイフコーター等公知の方法が適宜使用される。 As an application method of the anchor layer coating solution and the adsorption layer coating solution, known methods such as a multi-stage roll coater represented by a three-offset gravure coater and a five-roll coater, a direct gravure coater, a bar coater, and an air knife coater are available. Used as appropriate.
(セパレータ)
本発明においては、吸着層の表面の汚れや異物付着を防いだり、両面粘着フィルムのハンドリングを向上させるため、そして特に前記両面粘着フィルムを透明保護カバーに貼り合わせて情報表示画面の保護部材として用いたときに、気泡の混入を抑える目的で、プラスチックフィルムからなるセパレータを吸着層面に貼り合わせて用いる。
(Separator)
In the present invention, the surface of the adsorption layer is prevented from being stained and foreign matter adhered, and the handling of the double-sided pressure-sensitive adhesive film is improved. In order to prevent air bubbles from being mixed, a separator made of a plastic film is attached to the surface of the adsorption layer.
本発明の両面粘着フィルムのセパレータには、プラスチックフィルムが用いられる。例えば、ポリエステルフィルム、ポリプロピレンフィルム、ポリエチレンフィルム、ポリカーボネートフィルム、ポリスチレンフィルム等を挙げることができる。これらの中で、生産性、加工性に優れるポリエステルフィルムが好ましく使用できる。また、このようなポリエステルフィルムには二軸延伸フィルム、一軸延伸フィルム、無延伸フィルムがあり、そのいずれも使用できるが、特に二軸延伸フィルムが汎用的であり好ましく使用できる。プラスチックフィルムの厚さとしては、25〜200μmが好ましく用いられる。25μmより薄いとフィルム強度が不足し、十分な保護性能が得られなかったり、剥離時にフィルムが破れる等の問題が発生する。また、200μmより厚いとフィルム自体が高価になる等の問題が発生する。 A plastic film is used for the separator of the double-sided pressure-sensitive adhesive film of the present invention. For example, a polyester film, a polypropylene film, a polyethylene film, a polycarbonate film, a polystyrene film, etc. can be mentioned. Among these, a polyester film excellent in productivity and processability can be preferably used. Such polyester films include a biaxially stretched film, a uniaxially stretched film, and an unstretched film, and any of them can be used. In particular, a biaxially stretched film is generally used and can be preferably used. The thickness of the plastic film is preferably 25 to 200 μm. If the thickness is less than 25 μm, the film strength is insufficient, and sufficient protection performance cannot be obtained, and the film may be broken at the time of peeling. On the other hand, if it is thicker than 200 μm, the film itself becomes expensive.
前記吸着層面に貼り合わせるセパレータの中心線表面粗さRaは0.20μm以下とすることが好ましい。より好ましくは、セパレータの中心線表面粗さが0.10μm以下である。前記中心線表面粗さが0.20μmより大きくなると、セパレータ表面の粗さが吸着層面に転写し、透明保護カバーと粘着剤層を貼着して保護部材となした際に粘着剤層の塑性変形では打ち消せない凹凸を吸着剤表面に生じさせてしまい、前記保護部材の吸着層面をディスプレイパネルの情報表示画面へ貼り付けた際に、気泡の混入が発生しやすくなるという問題がある。 The center line surface roughness Ra of the separator to be bonded to the adsorption layer surface is preferably 0.20 μm or less. More preferably, the center line surface roughness of the separator is 0.10 μm or less. When the center line surface roughness is greater than 0.20 μm, the roughness of the separator surface is transferred to the surface of the adsorption layer, and when the transparent protective cover and the adhesive layer are adhered to form a protective member, the plasticity of the adhesive layer There is a problem that irregularities that cannot be canceled out by deformation are generated on the surface of the adsorbent, and bubbles are likely to be mixed when the adsorbing layer surface of the protective member is attached to the information display screen of the display panel.
(表面粗さの測定方法)
本発明における中心線表面粗さの測定は、接触型表面粗さ計(株式会社小坂研究所製、AY−22)を用いて行い、測定した得られた中心線平均粗さRaを用いる。
(Measurement method of surface roughness)
The measurement of the centerline surface roughness in the present invention is performed using a contact type surface roughness meter (AY-22, manufactured by Kosaka Laboratory Ltd.), and the measured centerline average roughness Ra is used.
以下、実施例と比較例を示して本発明を詳細に説明するが、本発明は下記の実施例に制限されるものではない。なお、各実施例中の「部」は特に断ることのない限り重量部を示したものである。 EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated in detail, this invention is not restrict | limited to the following Example. In the examples, “parts” indicates parts by weight unless otherwise specified.
(実施例1〜9、比較例1〜2)
プラズマ処理された厚み50μmのポリエチレンテレフタレートフィルムの片面に、下記アンカー層塗工液をグラビアコーターで塗工、乾燥して、厚み2μmのアンカー層を形成した。
(アンカー層塗工液)
アクリルポリオール樹脂 20部
(東レファインケミカル製、コータックス(登録商標)LH455、固形分:50%)
ポリチオフェン 27部
(信越ポリマー製、セプルジーダ(登録商標)OC−SC100、固形分:3%)
MEK 40部
トルエン 13部
(Examples 1-9, Comparative Examples 1-2)
The following anchor layer coating solution was applied with a gravure coater on one side of a plasma-treated polyethylene terephthalate film having a thickness of 50 μm, and an anchor layer having a thickness of 2 μm was formed.
(Anchor layer coating solution)
20 parts of acrylic polyol resin (manufactured by Toray Fine Chemicals, Cotax (registered trademark) LH455, solid content: 50%)
27 parts of polythiophene (manufactured by Shin-Etsu Polymer, Sepulzida (registered trademark) OC-SC100, solid content: 3%)
MEK 40 parts Toluene 13 parts
(実施例1〜9、比較例1〜2)
前記のアンカー層の上に、下記に記載の吸着層塗工液をダイコーターにて塗工して設けた後、オーブンにて150℃、100秒で架橋させて、厚み28μmの吸着層を形成した。
(吸着層塗工液)
分子末端及び側鎖にビニル基を有する直鎖状ジオルガノポリシロキサン68.59部
(重量平均分子量Mw:540,000)/無溶剤型
オルガノハイドロジェンシロキサン−ジオルガノシロキサンコポリマー 0.41部
(重量平均分子量Mw:2,000)/無溶剤型
白金触媒(信越ポリマー製、PL−56) 1.00部
トルエン 30.00部
合 計 100.00部
(Examples 1-9, Comparative Examples 1-2)
On the anchor layer, the adsorption layer coating solution described below is applied by a die coater and then crosslinked in an oven at 150 ° C. for 100 seconds to form an adsorption layer having a thickness of 28 μm. did.
(Adsorption layer coating solution)
68.59 parts of linear diorganopolysiloxane having vinyl groups at the molecular terminals and side chains (weight average molecular weight Mw: 540,000) / solvent-free organohydrogensiloxane-diorganosiloxane copolymer 0.41 part (weight) Average molecular weight Mw: 2,000) / solvent-free platinum catalyst (manufactured by Shin-Etsu Polymer, PL-56) 1.00 parts Toluene 30.00 parts Total 100.00 parts
(実施例1〜9、比較例1〜2)
前記の吸着層が形成された各粘着フィルムの吸着層面に、厚さ50μmのポリエステルフィルムのセパレータを2本のロール(ゴムロールとメタルロール)にて挟み込み、空気を逃がしながら両者を貼り合わせて、プラズマ処理された厚み50μmのポリエチレンテレフタレートフィルムの片面に吸着層、セパレータが積層された粘着フィルムを得た。
(Examples 1-9, Comparative Examples 1-2)
A 50 µm thick polyester film separator is sandwiched between two rolls (rubber roll and metal roll) on the adsorption layer surface of each adhesive film on which the adsorption layer is formed. A pressure-sensitive adhesive film in which an adsorption layer and a separator were laminated on one side of a treated 50 μm-thick polyethylene terephthalate film was obtained.
(実施例1)
前記粘着フィルムの、吸着層が形成された面とは反対側の面に、下記に記載の粘着剤層塗工液をダイコーターで塗工し、100℃で2分間加熱・乾燥して、20μmの厚みになる様調整して粘着剤層を形成した。
(粘着剤層塗工液)
アクリル系共重合体 100.0部
(アクリル酸ヒドロキシブチル、アクリル酸ブチル共重合物、重量平均分子量Mw:約500,000、固形分 37%)
ヘキサメチレンジイソシアネート 0.05部
(固形分 37.5%)
合計 100.05部
Example 1
The pressure-sensitive adhesive film is coated on the surface opposite to the surface on which the adsorption layer is formed with the following pressure-sensitive adhesive layer coating solution with a die coater, heated and dried at 100 ° C. for 2 minutes, and 20 μm. The pressure-sensitive adhesive layer was formed by adjusting so as to have a thickness of 2 mm.
(Adhesive layer coating solution)
Acrylic copolymer 100.0 parts (hydroxybutyl acrylate, butyl acrylate copolymer, weight average molecular weight Mw: about 500,000, solid content 37%)
Hexamethylene diisocyanate 0.05 parts (solid content 37.5%)
Total 100.05 parts
(実施例2)
下記に記載の粘着剤層塗工液を、実施例1と同様の工程にて塗工、乾燥して厚さ20μmの粘着剤層を形成した。
(粘着剤層塗工液)
アクリル系共重合体 100.0部
(アクリル酸ヒドロキシブチル、アクリル酸ブチル共重合物、重量平均分子量Mw:約500,000、固形分 37%)
ヘキサメチレンジイソシアネート 0.10部
(固形分 37.5%)
合計 100.10部
(Example 2)
The pressure-sensitive adhesive layer coating solution described below was applied and dried in the same steps as in Example 1 to form a pressure-sensitive adhesive layer having a thickness of 20 μm.
(Adhesive layer coating solution)
Acrylic copolymer 100.0 parts (hydroxybutyl acrylate, butyl acrylate copolymer, weight average molecular weight Mw: about 500,000, solid content 37%)
Hexamethylene diisocyanate 0.10 parts (solid content 37.5%)
Total 100.10 copies
(実施例3)
下記に記載の粘着剤層塗工液を、実施例1と同様の工程にて塗工、乾燥して厚さ20μmの粘着剤層を形成した。
(粘着剤層塗工液)
アクリル系共重合体 100.0部
(アクリル酸ヒドロキシブチル、アクリル酸ブチル共重合物、重量平均分子量Mw:約500,000、固形分 37%)
ヘキサメチレンジイソシアネート 0.20部
(固形分 37.5%)
合計 100.20部
(Example 3)
The pressure-sensitive adhesive layer coating solution described below was applied and dried in the same steps as in Example 1 to form a pressure-sensitive adhesive layer having a thickness of 20 μm.
(Adhesive layer coating solution)
Acrylic copolymer 100.0 parts (hydroxybutyl acrylate, butyl acrylate copolymer, weight average molecular weight Mw: about 500,000, solid content 37%)
Hexamethylene diisocyanate 0.20 parts (solid content 37.5%)
Total 100.20 copies
(実施例4)
下記に記載の粘着剤層塗工液を、実施例1と同様の工程にて塗工、乾燥して厚さ20μmの粘着剤層を形成した。
(粘着剤層塗工液)
アクリル系共重合体 100.0部
(アクリル酸ヒドロキシブチル、アクリル酸ブチル共重合物、重量平均分子量Mw:約500,000、固形分 37%)
ヘキサメチレンジイソシアネート 0.50部
(固形分 37.5%)
合計 100.50部
Example 4
The pressure-sensitive adhesive layer coating solution described below was applied and dried in the same steps as in Example 1 to form a pressure-sensitive adhesive layer having a thickness of 20 μm.
(Adhesive layer coating solution)
Acrylic copolymer 100.0 parts (hydroxybutyl acrylate, butyl acrylate copolymer, weight average molecular weight Mw: about 500,000, solid content 37%)
Hexamethylene diisocyanate 0.50 parts (solid content 37.5%)
Total 100.50 parts
(実施例5)
下記に記載の粘着剤層塗工液を、実施例1と同様の工程にて塗工、乾燥して厚さ20μmの粘着剤層を形成した。
(粘着剤層塗工液)
アクリル系共重合体 100.0部
(アクリル酸ヒドロキシブチル、アクリル酸ブチル共重合物、重量平均分子量Mw:約500,000、固形分 37%)
ヘキサメチレンジイソシアネート 1.60部
(固形分 37.5%)
合計 101.60部
(Example 5)
The pressure-sensitive adhesive layer coating solution described below was applied and dried in the same steps as in Example 1 to form a pressure-sensitive adhesive layer having a thickness of 20 μm.
(Adhesive layer coating solution)
Acrylic copolymer 100.0 parts (hydroxybutyl acrylate, butyl acrylate copolymer, weight average molecular weight Mw: about 500,000, solid content 37%)
Hexamethylene diisocyanate 1.60 parts (solid content 37.5%)
101.60 copies in total
(実施例6)
実施例4と同組成の粘着剤層塗工液を実施例1と同様の工程にて塗工、乾燥して厚さ6μmの粘着剤層を形成した。
(Example 6)
A pressure-sensitive adhesive layer coating solution having the same composition as in Example 4 was applied and dried in the same steps as in Example 1 to form a pressure-sensitive adhesive layer having a thickness of 6 μm.
(実施例7)
実施例4と同組成の粘着剤層塗工液を実施例1と同様の工程にて塗工、乾燥して厚さ30μmの粘着剤層を形成した。
(Example 7)
A pressure-sensitive adhesive layer coating solution having the same composition as in Example 4 was applied and dried in the same steps as in Example 1 to form a pressure-sensitive adhesive layer having a thickness of 30 μm.
(実施例8)
下記に記載の粘着剤層塗工液を、実施例1と同様の工程にて塗工、乾燥して厚さ20μmの粘着剤層を形成した。
(粘着剤層塗工液)
アクリル系共重合体 100.0部
(アクリル酸ヒドロキシブチル、アクリル酸ブチル共重合物、重量平均分子量Mw:約500,000、固形分 37%)
キシリレンジイソシアネート 0.10部
(固形分 75%)
合計 100.10部
(Example 8)
The pressure-sensitive adhesive layer coating solution described below was applied and dried in the same steps as in Example 1 to form a pressure-sensitive adhesive layer having a thickness of 20 μm.
(Adhesive layer coating solution)
Acrylic copolymer 100.0 parts (hydroxybutyl acrylate, butyl acrylate copolymer, weight average molecular weight Mw: about 500,000, solid content 37%)
0.10 parts of xylylene diisocyanate (solid content 75%)
Total 100.10 copies
(実施例9)
下記に記載の粘着剤層塗工液を、実施例1と同様の工程にて塗工、乾燥して厚さ20μmの粘着剤層を形成した。
(粘着剤層塗工液)
アクリル系共重合体 100.0部
(アクリル酸ヒドロキシエチル、アクリル酸−2−エチルヘキシル共重合物、重量平均分子量Mw:約600,000、固形分 40%)
ヘキサメチレンジイソシアネート 0.50部
(固形分 37.5%)
合計 100.50部
Example 9
The pressure-sensitive adhesive layer coating solution described below was applied and dried in the same steps as in Example 1 to form a pressure-sensitive adhesive layer having a thickness of 20 μm.
(Adhesive layer coating solution)
Acrylic copolymer 100.0 parts (hydroxyethyl acrylate, 2-ethylhexyl acrylate copolymer, weight average molecular weight Mw: about 600,000, solid content 40%)
Hexamethylene diisocyanate 0.50 parts (solid content 37.5%)
Total 100.50 parts
(比較例1)
下記に記載の粘着剤層塗工液を、実施例1と同様の工程にて塗工、乾燥して厚さ20μmの粘着剤層を形成した。
(粘着剤層塗工液)
アクリル系共重合体 100.0部
(アクリル酸ヒドロキシブチル、アクリル酸ブチル共重合物、重量平均分子量Mw:約500,000、固形分 37%)
ヘキサメチレンジイソシアネート 0.02部
(固形分 37.5%)
合計 100.02部
(Comparative Example 1)
The pressure-sensitive adhesive layer coating solution described below was applied and dried in the same steps as in Example 1 to form a pressure-sensitive adhesive layer having a thickness of 20 μm.
(Adhesive layer coating solution)
Acrylic copolymer 100.0 parts (hydroxybutyl acrylate, butyl acrylate copolymer, weight average molecular weight Mw: about 500,000, solid content 37%)
Hexamethylene diisocyanate 0.02 parts (solid content 37.5%)
Total 100.02 parts
(比較例2)
下記に記載の粘着剤層塗工液を、実施例1と同様の工程にて塗工、乾燥して厚さ20μmの粘着剤層を形成した。
(粘着剤層塗工液)
アクリル系共重合体 100.0部
(アクリル酸ヒドロキシブチル、アクリル酸ブチル共重合物、重量平均分子量Mw:約500,000、固形分 37%)
ヘキサメチレンジイソシアネート 2.50部
(固形分 37.5%)
合計 102.50部
(Comparative Example 2)
The pressure-sensitive adhesive layer coating solution described below was applied and dried in the same steps as in Example 1 to form a pressure-sensitive adhesive layer having a thickness of 20 μm.
(Adhesive layer coating solution)
Acrylic copolymer 100.0 parts (hydroxybutyl acrylate, butyl acrylate copolymer, weight average molecular weight Mw: about 500,000, solid content 37%)
Hexamethylene diisocyanate 2.50 parts (solid content 37.5%)
102.50 copies in total
(実施例1〜9、比較例1〜2)
前記の粘着剤層が形成された各粘着フィルムの粘着剤面に、厚さが25μmのシリコーン系剥離剤を塗工したカバーフィルム(ポリエチレンテレフタレート製)の剥離剤塗工面を向かい合わせて2本のロール(ゴムロールとメタルロール)にて挟み込み、空気を逃がしながら両者を貼り合わせた後、本発明の両面粘着フィルムを得た。
(Examples 1-9, Comparative Examples 1-2)
The adhesive surface of each adhesive film on which the above-mentioned adhesive layer is formed has two release agent-coated surfaces of a cover film (made of polyethylene terephthalate) coated with a silicone release agent having a thickness of 25 μm. The film was sandwiched between rolls (rubber roll and metal roll) and bonded together while letting air escape, to obtain a double-sided pressure-sensitive adhesive film of the present invention.
各実施例、比較例の評価結果を表1に、各評価方法を下記に示す。 The evaluation results of each example and comparative example are shown in Table 1, and each evaluation method is shown below.
(評価方法)
(粘着剤層のゲル分率)
厚さ50μmのポリエチレンテレフタレートフィルムを基材とし、実施例1〜9、比較例1〜2の粘着剤層塗工液を前記基材の片面に塗工し、100℃で2分間加熱・乾燥して、実施例1〜9、比較例1〜2に提示した厚みの粘着剤層を形成した。この粘着剤層のみを設けたフィルムを100mm×100mmの大きさにカットして試験片を作製し、その試験片の重量を測定した。次に前記の各試験片をトルエンに30分浸漬させた後、試験片及びトルエン溶液をろ過した残渣を45℃で24時間乾燥させて、浸漬後の試験片の乾燥後重量およびトルエン溶液をろ過した残渣の乾燥後重量を測定した。その後、乾燥後試験片から粘着剤層を除去して基材重量を測定した。ゲル分率は以下の式によって算出した。
(トルエン浸漬後の試験片及びろ過残渣の乾燥重量−基材重量)/(トルエン浸漬前の試験片重量−基材重量)(%)
(Evaluation method)
(Gel fraction of adhesive layer)
Using a polyethylene terephthalate film having a thickness of 50 μm as a base material, the adhesive layer coating liquids of Examples 1 to 9 and Comparative Examples 1 and 2 were applied to one side of the base material, and heated and dried at 100 ° C. for 2 minutes. Thus, pressure-sensitive adhesive layers having the thicknesses shown in Examples 1 to 9 and Comparative Examples 1 and 2 were formed. A film provided with only the pressure-sensitive adhesive layer was cut into a size of 100 mm × 100 mm to prepare a test piece, and the weight of the test piece was measured. Next, each test piece is immersed in toluene for 30 minutes, and then the residue obtained by filtering the test piece and the toluene solution is dried at 45 ° C. for 24 hours, and the weight after the drying of the test piece after immersion and the toluene solution are filtered. The dried residue was weighed after drying. Thereafter, the pressure-sensitive adhesive layer was removed from the test piece after drying, and the substrate weight was measured. The gel fraction was calculated by the following formula.
(Dry weight of test pieces and filtration residue after toluene immersion-base weight) / (Test piece weight before toluene immersion-base weight) (%)
(粘着剤層表面のマルテンス硬度)
上記作成した両面粘着フィルムを10mm×10mmの大きさにカットして試験片を作製し、超微小押し込み硬さ試験機(株式会社エリオニクス製 ENT―2100)を使用して下記条件にて各サンプルの粘着剤層表面のマルテンス硬度を測定した。
使用圧子:球状圧子(半径200μm)
最大荷重:10μN
荷重時間:10sec
保持時間:5sec
徐荷時間:10sec
(Martens hardness of the adhesive layer surface)
The above-prepared double-sided adhesive film was cut into a size of 10 mm × 10 mm to prepare a test piece, and each sample was subjected to the following conditions using an ultra-fine indentation hardness tester (ENTIONS manufactured by Elionix Co., Ltd.). The Martens hardness of the pressure-sensitive adhesive layer surface was measured.
Working indenter: Spherical indenter (radius 200 μm)
Maximum load: 10μN
Loading time: 10 sec
Holding time: 5 sec
Unloading time: 10 sec
(粘着剤層の写像性)
上記作成した両面粘着フィルムを100mm×100mmにカットし、写像性試験器(スガ試験機株式会社製ICM−1DP)を使用してJIS K 7374に準拠した方法にて各サンプルの写像性を測定した。
(Image clarity of the adhesive layer)
The prepared double-sided adhesive film was cut into 100 mm × 100 mm, and the image clarity of each sample was measured using a image clarity tester (ICM-1DP manufactured by Suga Test Instruments Co., Ltd.) in accordance with JIS K 7374. .
(粘着力)
上記作成した両面粘着フィルムを25mm幅にカットし、表面を研磨したSUS304のステンレス板に前記両面粘着フィルムの粘着剤層を貼着し、2kgの荷重をかけたロールを2往復させ、30分間常温放置した後に、粘着剤層面から180度方向に引き剥がした際の引き剥がし力を測定した。
(Adhesive force)
The prepared double-sided pressure-sensitive adhesive film was cut to a width of 25 mm, and the adhesive layer of the double-sided pressure-sensitive adhesive film was adhered to a stainless steel plate of SUS304 whose surface was polished. After leaving to stand, the peeling force at the time of peeling from the pressure-sensitive adhesive layer surface in the direction of 180 ° was measured.
(気泡の混入評価)
上記作成した両面粘着フィルムを120mm×55mmにカットし、厚み300μmの透明保護カバー(ガラス板)に、前記両面粘着フィルムのセパレータを積層した吸着層側から、2kgの荷重ロールを2往復させて粘着剤層を貼着した後、常温(25℃)で、24時間放置して、本発明の情報表示画面用の保護部材を得た。その後、前記保護部材のセパレータを剥離して、吸着層を厚み3mmのソーダ石灰ガラス板に貼り合わせ、気泡の混入を目視確認した。
評価基準
◎:気泡の混入が全くない
○:気泡の混入が殆どなく、実用上問題ない。
×:気泡が混入し、残っている
(Bubble contamination evaluation)
The double-sided adhesive film created above is cut into 120 mm x 55 mm, and a 2 kg load roll is reciprocated twice from the adsorbing layer side where the separator of the double-sided adhesive film is laminated on a 300 μm thick transparent protective cover (glass plate). After pasting the agent layer, it was left at room temperature (25 ° C.) for 24 hours to obtain a protective member for an information display screen of the present invention. Thereafter, the separator of the protective member was peeled off, and the adsorbing layer was bonded to a soda-lime glass plate having a thickness of 3 mm.
Evaluation Criteria A: There is no mixing of bubbles. B: There is almost no mixing of bubbles, and there is no practical problem.
×: Air bubbles are mixed in and remain
1 基材フィルム
10 両面粘着フィルム
2 アンカー層
20 透明保護カバー
3 吸着層
30 情報表示画面用の保護部材
4 セパレータ
5 粘着剤層
6 カバーフィルム
7 透明保護カバー(ガラス板)
8 光反射防止層
DESCRIPTION OF
8 Light reflection prevention layer
Claims (5)
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JP2015039146A JP6472044B2 (en) | 2015-02-27 | 2015-02-27 | Double-sided adhesive film and protective member for information display screen using the same |
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JP2015039146A JP6472044B2 (en) | 2015-02-27 | 2015-02-27 | Double-sided adhesive film and protective member for information display screen using the same |
Publications (2)
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JP2016160322A JP2016160322A (en) | 2016-09-05 |
JP6472044B2 true JP6472044B2 (en) | 2019-02-20 |
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Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP7067398B2 (en) * | 2018-10-02 | 2022-05-16 | 信越化学工業株式会社 | Method for manufacturing UV curable silicone adhesive composition and laminate |
JP7498606B2 (en) * | 2019-10-30 | 2024-06-12 | 日東電工株式会社 | Image display device and optical member set |
CN112175533B (en) * | 2020-09-30 | 2022-04-29 | 汇精(厦门)电子科技有限公司 | Double-sided adhesive film of vehicle-mounted display screen and preparation method |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004196991A (en) * | 2002-12-19 | 2004-07-15 | Shin Etsu Polymer Co Ltd | Transparent silicone adhesive member for optical display and transparent laminate |
CN101802122B (en) * | 2007-09-20 | 2014-09-17 | 东洋纺织株式会社 | Adhesive sheet, upper electrode for touch panel, and image display device |
JP5049144B2 (en) * | 2008-01-22 | 2012-10-17 | 東洋紡績株式会社 | Image display device manufacturing method, and image display device manufactured using the manufacturing method |
JP2012224805A (en) * | 2011-04-22 | 2012-11-15 | Nitto Denko Corp | Surface-protecting film |
JP6251111B2 (en) * | 2014-04-10 | 2017-12-20 | フジコピアン株式会社 | Double-sided adhesive film and protective member for information display screen using the same |
JP6364663B2 (en) * | 2014-10-03 | 2018-08-01 | フジコピアン株式会社 | Double-sided adhesive film and protective member for information display screen using the same |
JP6383968B2 (en) * | 2014-11-27 | 2018-09-05 | フジコピアン株式会社 | Double-sided adhesive film and protective member for information display screen using the same |
JP6427777B2 (en) * | 2014-12-22 | 2018-11-28 | フジコピアン株式会社 | Double-sided adhesive film and protective member for information display screen using the same |
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