JP6523725B2 - Double-sided adhesive tape - Google Patents
Double-sided adhesive tape Download PDFInfo
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- JP6523725B2 JP6523725B2 JP2015056566A JP2015056566A JP6523725B2 JP 6523725 B2 JP6523725 B2 JP 6523725B2 JP 2015056566 A JP2015056566 A JP 2015056566A JP 2015056566 A JP2015056566 A JP 2015056566A JP 6523725 B2 JP6523725 B2 JP 6523725B2
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- sensitive adhesive
- double
- adhesive tape
- pressure
- acrylic
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- 239000002390 adhesive tape Substances 0.000 title claims description 35
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 93
- 239000010410 layer Substances 0.000 claims description 62
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 45
- 239000006260 foam Substances 0.000 claims description 40
- 229920000098 polyolefin Polymers 0.000 claims description 34
- 229920006243 acrylic copolymer Polymers 0.000 claims description 25
- 239000000758 substrate Substances 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 14
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 claims description 10
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 10
- 230000009477 glass transition Effects 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 7
- -1 polyethylene Polymers 0.000 claims description 7
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 description 38
- 230000001070 adhesive effect Effects 0.000 description 38
- 239000011347 resin Substances 0.000 description 20
- 229920005989 resin Polymers 0.000 description 20
- 238000000034 method Methods 0.000 description 18
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
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- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 12
- 239000003431 cross linking reagent Substances 0.000 description 12
- 239000000178 monomer Substances 0.000 description 12
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 12
- 150000002148 esters Chemical class 0.000 description 11
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 238000004132 cross linking Methods 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 7
- 239000004417 polycarbonate Substances 0.000 description 7
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- 229920005672 polyolefin resin Polymers 0.000 description 7
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 6
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- 150000002513 isocyanates Chemical class 0.000 description 5
- 238000006116 polymerization reaction Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 4
- 238000005227 gel permeation chromatography Methods 0.000 description 4
- 229920013716 polyethylene resin Polymers 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 150000001451 organic peroxides Chemical class 0.000 description 3
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- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-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
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- 208000030984 MIRAGE syndrome Diseases 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N Propene Chemical compound CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
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- 230000001747 exhibiting effect Effects 0.000 description 2
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- 239000004088 foaming agent Substances 0.000 description 2
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- 229910052757 nitrogen Inorganic materials 0.000 description 2
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 2
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- TVLSRXXIMLFWEO-UHFFFAOYSA-N prochloraz Chemical compound C1=CN=CN1C(=O)N(CCC)CCOC1=C(Cl)C=C(Cl)C=C1Cl TVLSRXXIMLFWEO-UHFFFAOYSA-N 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
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- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- 239000004711 α-olefin Substances 0.000 description 2
- FVQMJJQUGGVLEP-UHFFFAOYSA-N (2-methylpropan-2-yl)oxy 2-ethylhexaneperoxoate Chemical compound CCCCC(CC)C(=O)OOOC(C)(C)C FVQMJJQUGGVLEP-UHFFFAOYSA-N 0.000 description 1
- HCXVPNKIBYLBIT-UHFFFAOYSA-N (2-methylpropan-2-yl)oxy 3,5,5-trimethylhexaneperoxoate Chemical compound CC(C)(C)CC(C)CC(=O)OOOC(C)(C)C HCXVPNKIBYLBIT-UHFFFAOYSA-N 0.000 description 1
- FYRCDEARNUVZRG-UHFFFAOYSA-N 1,1,5-trimethyl-3,3-bis(2-methylpentan-2-ylperoxy)cyclohexane Chemical compound CCCC(C)(C)OOC1(OOC(C)(C)CCC)CC(C)CC(C)(C)C1 FYRCDEARNUVZRG-UHFFFAOYSA-N 0.000 description 1
- AYMDJPGTQFHDSA-UHFFFAOYSA-N 1-(2-ethenoxyethoxy)-2-ethoxyethane Chemical compound CCOCCOCCOC=C AYMDJPGTQFHDSA-UHFFFAOYSA-N 0.000 description 1
- KPAPHODVWOVUJL-UHFFFAOYSA-N 1-benzofuran;1h-indene Chemical compound C1=CC=C2CC=CC2=C1.C1=CC=C2OC=CC2=C1 KPAPHODVWOVUJL-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
- XKBHBVFIWWDGQX-UHFFFAOYSA-N 2-bromo-3,3,4,4,5,5,5-heptafluoropent-1-ene Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(Br)=C XKBHBVFIWWDGQX-UHFFFAOYSA-N 0.000 description 1
- RTEZVHMDMFEURJ-UHFFFAOYSA-N 2-methylpentan-2-yl 2,2-dimethylpropaneperoxoate Chemical compound CCCC(C)(C)OOC(=O)C(C)(C)C RTEZVHMDMFEURJ-UHFFFAOYSA-N 0.000 description 1
- UPTHZKIDNHJFKQ-UHFFFAOYSA-N 2-methylprop-2-enoic acid;propane-1,2,3-triol Chemical compound CC(=C)C(O)=O.CC(=C)C(O)=O.OCC(O)CO UPTHZKIDNHJFKQ-UHFFFAOYSA-N 0.000 description 1
- NFWPZNNZUCPLAX-UHFFFAOYSA-N 4-methoxy-3-methylaniline Chemical compound COC1=CC=C(N)C=C1C NFWPZNNZUCPLAX-UHFFFAOYSA-N 0.000 description 1
- NOWKCMXCCJGMRR-UHFFFAOYSA-N Aziridine Chemical compound C1CN1 NOWKCMXCCJGMRR-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000013032 Hydrocarbon resin Substances 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-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
- 239000004793 Polystyrene Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- KYIKRXIYLAGAKQ-UHFFFAOYSA-N abcn Chemical compound C1CCCCC1(C#N)N=NC1(C#N)CCCCC1 KYIKRXIYLAGAKQ-UHFFFAOYSA-N 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 230000005260 alpha ray Effects 0.000 description 1
- 229920006272 aromatic hydrocarbon resin Polymers 0.000 description 1
- 230000005250 beta ray Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
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- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 1
- 235000012489 doughnuts Nutrition 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 1
- QFOJTGAPBXCVOK-UHFFFAOYSA-N hexyl 2-ethylhexaneperoxoate Chemical compound CCCCCCOOC(=O)C(CC)CCCC QFOJTGAPBXCVOK-UHFFFAOYSA-N 0.000 description 1
- 229920006270 hydrocarbon resin Polymers 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 125000002768 hydroxyalkyl group Chemical group 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000005865 ionizing radiation Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- RBQRWNWVPQDTJJ-UHFFFAOYSA-N methacryloyloxyethyl isocyanate Chemical compound CC(=C)C(=O)OCCN=C=O RBQRWNWVPQDTJJ-UHFFFAOYSA-N 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
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- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
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- OPQYOFWUFGEMRZ-UHFFFAOYSA-N tert-butyl 2,2-dimethylpropaneperoxoate Chemical compound CC(C)(C)OOC(=O)C(C)(C)C OPQYOFWUFGEMRZ-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- KEROTHRUZYBWCY-UHFFFAOYSA-N tridecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCCOC(=O)C(C)=C KEROTHRUZYBWCY-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Landscapes
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Laminated Bodies (AREA)
Description
本発明は、電子機器部品固定用途や車輌部品固定用途に好適に用いることができる、高い粘着力、耐衝撃性、耐電圧性を発揮できる両面粘着テープに関する。 The present invention relates to a double-sided pressure-sensitive adhesive tape capable of exhibiting high adhesive strength, impact resistance, and voltage resistance, which can be suitably used for fixing electronic device parts and fixing vehicle parts.
画像表示装置又は入力装置を搭載した携帯電子機器（例えば、携帯電話、携帯情報端末等）においては、組み立てのために両面粘着テープが用いられている。具体的には、例えば、携帯電子機器の表面を保護するためのカバーパネルをタッチパネルモジュール又はディスプレイパネルモジュールに接着したり、タッチパネルモジュールとディスプレイパネルモジュールとを接着したりするために両面粘着テープが用いられている。このような両面粘着テープは、例えば、額縁状等の形状に打ち抜かれ、表示画面の周辺に配置されるようにして用いられる（例えば、特許文献１、２）。また、車輌部品（例えば、車載用パネル）を車両本体に固定する用途にも両面粘着テープが用いられている。
In a portable electronic device (for example, a mobile phone, a portable information terminal or the like) equipped with an image display device or an input device, a double-sided adhesive tape is used for assembly. Specifically, for example, a double-sided adhesive tape is used to bond a cover panel for protecting the surface of a portable electronic device to a touch panel module or a display panel module, or to bond a touch panel module and a display panel module. It is done. Such a double-sided pressure-sensitive adhesive tape is punched into, for example, a shape such as a frame shape, and is used as disposed around the display screen (for example,
電子機器部品の固定や車載部品の固定に用いられる両面粘着テープには、高い粘着力のみならず、耐衝撃性や耐電圧性等が要求される。耐衝撃性等に優れる両面粘着テープとしては、例えば、特許文献１及び２に、基材層の少なくとも片面にアクリル系粘着剤層が積層一体化されており、該基材層が特定の架橋度及び気泡のアスペクト比を有する架橋ポリオレフィン系樹脂発泡シートであるものが開示されている。
Not only high adhesive strength but also impact resistance and voltage resistance are required for the double-sided pressure-sensitive adhesive tape used for fixing electronic device parts and for fixing on-vehicle parts. As a double-sided pressure-sensitive adhesive tape excellent in impact resistance and the like, for example, in
近年の大型の携帯電子機器における部品の接着固定、車輌部品の接着固定等の用途においては、重量の大きな部品又は部材を貼り合わせる必要があり、両面粘着テープにかかる負荷が大きくなっている。また、近年の携帯電子機器では、表示画面の周辺を狭くしてより広い画面を確保する、いわゆる狭額縁化が進んでおり、狭額縁化した携帯電子機器では画面の周辺部の幅が極めて狭いため、接着面積が狭くとも確実に部材を固定できる高い粘着力が求められている。このように、電子機器部品の固定や車載部品の固定に用いられる両面粘着テープには、従来以上に高い粘着力、耐衝撃性、耐電圧性が求められるようになってきている。 In applications such as bonding and fixing of parts in large-sized portable electronic devices in recent years and bonding and fixing of vehicle parts, parts or members having a large weight need to be bonded, and the load applied to the double-sided adhesive tape is large. Also, in recent portable electronic devices, so-called narrowing of the frame is progressing to narrow the periphery of the display screen to secure a wider screen, and in the narrow framed portable electronic device, the width of the peripheral part of the screen is extremely narrow. Therefore, high adhesive strength is required which can securely fix the member even if the bonding area is narrow. As described above, the double-sided pressure-sensitive adhesive tape used for fixing electronic device parts and in-vehicle parts is required to have higher adhesive strength, impact resistance, and voltage resistance than ever before.
本発明は、上記現状に鑑み、電子機器部品固定用途や車輌部品固定用途に好適に用いることができる、高い粘着力、耐衝撃性、耐電圧性を発揮できる両面粘着テープを提供することを目的とする。 SUMMARY OF THE INVENTION In view of the above situation, the present invention aims to provide a double-sided pressure-sensitive adhesive tape capable of exhibiting high adhesive strength, impact resistance, and voltage resistance, which can be suitably used for fixing electronic device parts and fixing vehicle parts. I assume.
本発明は、ポリオレフィン発泡体からなる基材の両面にアクリル粘着剤層を有する両面粘着テープであって、前記ポリオレフィン発泡体からなる基材は、ＭＤ方向及びＴＤ方向における平均セル径がそれぞれ８０μｍ未満、発泡倍率が１．４〜２．２倍であり、前記アクリル粘着剤層は、動的粘弾性測定から求められるガラス転移温度Ｔｇが５〜１８℃、２３℃における貯蔵弾性率Ｇ’が２×１０５〜９×１０５Ｐａである両面粘着テープである。
以下に本発明を詳述する。
The present invention is a double-sided pressure-sensitive adhesive tape having an acrylic pressure-sensitive adhesive layer on both sides of a substrate made of a polyolefin foam, wherein the substrate made of the polyolefin foam has an average cell diameter of less than 80 μm in MD and TD directions. The expansion ratio is 1.4 to 2.2 times, and the acrylic adhesive layer has a glass transition temperature Tg of 5 to 18 ° C. and a storage elastic modulus G ′ of 23 ° C. a double-sided adhesive tape is a × 10 5 ~9 × 10 5 Pa .
The present invention will be described in detail below.
本発明者らは、鋭意検討の結果、基材として平均セル径が小さいポリオレフィン発泡体からなる基材を採用し、該基材の両面にガラス転移温度Ｔｇ及び貯蔵弾性率Ｇ’を一定範囲に制御した粘着剤層を形成することにより、従来に比べて高い粘着力、耐衝撃性、耐電圧性を発揮できる両面粘着テープが得られることを見出し、本発明を完成した。 As a result of intensive studies, the present inventors adopt a base material made of a polyolefin foam having a small average cell diameter as a base material, and set the glass transition temperature Tg and the storage elastic modulus G ′ in a certain range on both sides of the base material. By forming the controlled adhesive layer, it discovered that the double-sided adhesive tape which can exhibit high adhesive force, impact resistance, and voltage resistance compared with the past was obtained, and completed this invention.
本発明の両面粘着テープは、ポリオレフィン発泡体からなる基材（以下、単に「基材」ともいう。）の両面にアクリル粘着剤層（以下、単に「粘着剤層」ともいう。）を有する。
上記ポリオレフィン発泡体は、ＭＤ方向及びＴＤ方向における平均セル径がそれぞれ８０μｍ未満である。このような平均セル径の小さな発泡体を基材として用いることにより、特に両面粘着テープの耐衝撃性、耐電圧性を向上させることができる。上記ポリオレフィン発泡体のＭＤ方向及びＴＤ方向における平均セル径は、７０μｍ以下であることが好ましく、６０μｍ以下であることがより好ましい。
なお、ＭＤ方向（Ｍａｃｈｉｎｅ Ｄｉｒｅｃｔｉｏｎ）とは、ポリオレフィン発泡体をシート状に押出加工する際の押出方向をいい、ＴＤ方向（Ｔｒａｎｓｖｅｒｓｅ Ｄｉｒｅｃｔｉｏｎ）とはＭＤ方向に対して垂直方向をいう。
The double-sided pressure-sensitive adhesive tape of the present invention has an acrylic pressure-sensitive adhesive layer (hereinafter, also simply referred to as a "pressure-sensitive adhesive layer") on both sides of a substrate made of a polyolefin foam (hereinafter, also simply referred to as "substrate").
The polyolefin foam has an average cell diameter in the MD direction and the TD direction of less than 80 μm. The impact resistance and voltage resistance of the double-sided pressure-sensitive adhesive tape can be particularly improved by using such a foam having a small average cell diameter as a substrate. The average cell diameter in the MD direction and the TD direction of the polyolefin foam is preferably 70 μm or less, and more preferably 60 μm or less.
In addition, MD direction (Machine Direction) means the extrusion direction at the time of extruding a polyolefin foam to a sheet form, and TD direction (Transverse Direction) means a perpendicular direction to MD direction.
上記ＭＤ方向の平均セル径は、以下の方法により測定することができる。
まず、ポリオレフィン発泡体のサンプルを５０ｍｍ四方にカットし、液体窒素に１分間浸した後、カミソリ刃でＭＤ方向及び厚さ方向に平行な面に沿って切断する。次いで、デジタルマイクロスコープ（例えば、キーエンス社製、「ＶＨＸ−９００」等）を用いて、２００倍倍率で拡大写真を撮影し、ＭＤ方向における長さ２ｍｍの切断面に存在する全てのセルについてＭＤ方向のセル径を測定する。その操作を５回繰り返し、全てのＭＤ方向のセル径の平均値をＭＤ方向の平均セル径とする。
上記ＴＤ方向の平均セル径も、ポリオレフィン発泡体のサンプルをＴＤ方向及び厚さ方向に平行な面に沿って切断する以外は、同様にして測定することができる。
The average cell diameter in the MD direction can be measured by the following method.
First, a sample of polyolefin foam is cut into 50 mm squares, immersed in liquid nitrogen for 1 minute, and then cut with a razor blade along a plane parallel to the MD direction and thickness direction. Then, using a digital microscope (for example, "VHX-900" manufactured by Keyence Corporation), an enlarged photograph is taken at 200 times magnification, and all cells existing in the cut surface of 2 mm in length in the MD direction are MD Measure the cell diameter in the direction. The operation is repeated five times, and an average value of cell diameters in all MD directions is taken as an average cell diameter in MD directions.
The average cell diameter in the TD direction can also be measured in the same manner, except that the polyolefin foam sample is cut along a plane parallel to the TD direction and the thickness direction.
上記ポリオレフィン発泡体は、発泡倍率の下限が１．４倍、上限が２．２倍である。発泡倍率をこの範囲に調整したポリオレフィン発泡体を基材として用いることにより、特に両面粘着テープの耐衝撃性、耐電圧性を向上させることができる。上記ポリオレフィン発泡体の発泡倍率の好ましい下限は１．６倍、好ましい上限は２．０倍である。
なお、発泡倍率は、ＪＩＳＫ−６７６７に準拠して電子比重計（例えば、ミラージュ社製、「ＥＤ１２０Ｔ」）を使用して測定した密度の逆数から算出できる。
In the polyolefin foam, the lower limit of the expansion ratio is 1.4 times and the upper limit is 2.2 times. The impact resistance and the voltage resistance of the double-sided pressure-sensitive adhesive tape can be particularly improved by using, as a substrate, a polyolefin foam whose expansion ratio is adjusted to this range. The preferable lower limit of the expansion ratio of the polyolefin foam is 1.6 times, and the preferable upper limit is 2.0 times.
The expansion ratio can be calculated from the reciprocal of the density measured using an electronic densimeter (for example, “ED 120 T” manufactured by Mirage, Inc.) in accordance with JIS K-6767.
上記ポリオレフィン発泡体は、密度の好ましい下限が０．４５ｇ／ｃｍ３、好ましい上限が０．７１ｇ／ｃｍ３である。密度が０．４５ｇ／ｃｍ３未満であると、基材の強度が低下し、強い衝撃が加わった場合に破壊しやすくなる。密度が０．７１ｇ／ｃｍ３を超えると、基材の柔軟性が低下し、強い衝撃が加わった場合に上記粘着剤層との界面で剥離しやすくなる。密度の好ましい下限は０．５０ｇ／ｃｍ３、好ましい上限は０．６３ｇ／ｃｍ３である。なお、密度は、ＪＩＳＫ−６７６７に準拠して電子比重計（例えば、ミラージュ社製、「ＥＤ１２０Ｔ」）を使用して測定し算出できる。 The polyolefin foam has a preferable lower limit of density of 0.45 g / cm 3 and a preferable upper limit of 0.71 g / cm 3 . If the density is less than 0.45 g / cm 3 , the strength of the substrate is reduced, and the substrate is easily broken when a strong impact is applied. When the density exceeds 0.71 g / cm 3 , the flexibility of the substrate is reduced, and when a strong impact is applied, the substrate is easily peeled off at the interface with the pressure-sensitive adhesive layer. The preferred lower limit of the density is 0.50 g / cm 3 , and the preferred upper limit is 0.63 g / cm 3 . In addition, density can be measured and calculated using an electronic hydrometer (for example, Mirage company make, "ED120T") based on JISK-6767.
上記ポリオレフィン発泡体は、厚み方向の２５％圧縮強度が６００ｋＰａ以上であることが好ましい。厚み方向の２５％圧縮強度が６００ｋＰａ以上であるポリオレフィン発泡体を基材として用いることにより、特に両面粘着テープの耐衝撃性、耐電圧性をより向上させることができる。上記２５％圧縮強度のより好ましい上限は１５００ｋＰａである。上記２５％圧縮強度が１５００ｋＰａを超えると、基材の柔軟性が低下し、強い衝撃が加わった場合に粘着剤層との界面で剥離しやすくなる。上記２５％圧縮強度のより好ましい下限は７００ｋＰａ、より好ましい上限は１３００ｋＰａである。
なお、厚み方向の２５％圧縮強度は、ＪＩＳＫ−６７６７に準拠して測定できる。例えば、２ｃｍ×２ｃｍに裁断したポリオレフィン発泡体を重ね合わせて厚み１０ｍｍの積層体を作製し常温下に放置した後、常温下で、この積層体の厚み方向の２５％圧縮強度を測定すればよい。
The polyolefin foam preferably has a 25% compressive strength in the thickness direction of 600 kPa or more. By using a polyolefin foam having a 25% compressive strength of 600 kPa or more in the thickness direction as a substrate, particularly, the impact resistance and the voltage resistance of the double-sided pressure-sensitive adhesive tape can be further improved. A more preferable upper limit of the 25% compressive strength is 1500 kPa. When the 25% compressive strength exceeds 1500 kPa, the flexibility of the substrate is reduced, and when a strong impact is applied, the substrate is easily peeled off at the interface with the pressure-sensitive adhesive layer. A more preferable lower limit of the 25% compressive strength is 700 kPa, and a more preferable upper limit is 1300 kPa.
The 25% compressive strength in the thickness direction can be measured in accordance with JIS K-6767. For example, after laminating a polyolefin foam cut into 2 cm × 2 cm to prepare a laminate having a thickness of 10 mm and leaving it at normal temperature, the 25% compressive strength in the thickness direction of the laminate may be measured at normal temperature. .
上記ポリオレフィン発泡体は、ポリオレフィン系樹脂を含む発泡体であれば特に限定されず、例えば、ポリエチレン系発泡体、ポリプロピレン系発泡体、エチレン−プロピレン系発泡体等が挙げられる。なかでも、ポリエチレン系発泡体が好適である。 The said polyolefin foam will not be specifically limited if it is a foam containing polyolefin resin, For example, a polyethylene-type foam, a polypropylene-type foam, an ethylene-propylene type foam etc. are mentioned. Among them, polyethylene foam is preferable.
上記ポリオレフィン発泡体を構成するポリオレフィン樹脂は特に限定されないが、重合触媒として四価の遷移金属を含むメタロセン化合物を用いて得られたポリオレフィン樹脂が好ましい。なかでも、メタロセン化合物を用いて得られたポリエチレン樹脂がより好ましい。上記メタロセン化合物として、例えば、カミンスキー触媒等が挙げられる。 Although the polyolefin resin which comprises the said polyolefin foam is not specifically limited, The polyolefin resin obtained by using the metallocene compound containing a tetravalent transition metal as a polymerization catalyst is preferable. Among them, polyethylene resins obtained using metallocene compounds are more preferable. As said metallocene compound, a Kamin ski catalyst etc. are mentioned, for example.
上記メタロセン化合物を用いて得られたポリエチレン樹脂として、例えば、上記メタロセン化合物を用いて、エチレンと、必要に応じて配合される他のα−オレフィンとを共重合することにより得られたポリエチレン樹脂等が挙げられる。上記他のα−オレフィンとして、例えば、プロペン、１−ブテン、１−ペンテン、１−ヘキセン等が挙げられる。 As a polyethylene resin obtained using the above-mentioned metallocene compound, for example, a polyethylene resin etc. obtained by copolymerizing ethylene and other α-olefins optionally blended, using the above-mentioned metallocene compound Can be mentioned. Examples of the other α-olefins include propene, 1-butene, 1-pentene, 1-hexene and the like.
上記メタロセン化合物を用いて得られたポリエチレン樹脂は、他のオレフィン樹脂と併用されてもよい。上記他のオレフィン樹脂として、例えば、ポリエチレン、ポリプロピレン、エチレン−プロピレン共重合体等が挙げられる。 The polyethylene resin obtained using the above-mentioned metallocene compound may be used in combination with other olefin resin. Examples of the other olefin resin include polyethylene, polypropylene, ethylene-propylene copolymer and the like.
上記ポリオレフィン発泡体は、架橋されていることが好ましい。上記ポリオレフィン発泡体を架橋することで、見かけ密度や厚み方向の２５％圧縮強度を上記範囲に調整しやすくなる。
上記ポリオレフィン発泡体を架橋する方法は特に限定されず、例えば、上記ポリオレフィン発泡体に電子線、α線、β線、γ線等の電離性放射線を照射する方法、上記ポリオレフィン発泡体に予め配合しておいた有機過酸化物を加熱により分解させる方法等が挙げられる。
The polyolefin foam is preferably crosslinked. By crosslinking the above-mentioned polyolefin foam, the apparent density and the 25% compressive strength in the thickness direction can be easily adjusted to the above range.
The method of crosslinking the polyolefin foam is not particularly limited. For example, the method of irradiating the polyolefin foam with ionizing radiation such as electron beam, alpha ray, beta ray, gamma ray, etc. The method etc. which decompose | disassemble the stored organic peroxide by heating etc. are mentioned.
上記ポリオレフィン発泡体の製造方法は特に限定されないが、例えば、ポリオレフィン系樹脂と発泡剤とを含有する発泡性樹脂組成物を調製し、押出機を用いて発泡性樹脂組成物をシート状に押出加工する際に発泡剤を発泡させ、得られたポリオレフィン発泡体を必要に応じて架橋する方法が好ましい。 The method for producing the polyolefin foam is not particularly limited. For example, a foamable resin composition containing a polyolefin resin and a foaming agent is prepared, and the foamable resin composition is extruded into a sheet using an extruder. Preferred is a method of foaming a foaming agent at the same time and crosslinking the obtained polyolefin foam as required.
上記ポリオレフィン発泡体からなる基材の厚みは特に限定されないが、好ましい下限は８０μｍ、好ましい上限は３００μｍである。厚みが８０μｍ未満であると、上記基材の強度が低下し、強い衝撃が加わった場合に破壊することがある。厚みが３００μｍを超えると、上記基材の柔軟性が低下し、強い衝撃が加わった場合に上記粘着剤層との界面で剥離することがあり、また、被着体の形状に沿って密着させて貼り合わせることが困難になることがある。 Although the thickness of the base material which consists of said polyolefin foam is not specifically limited, A preferable minimum is 80 micrometers and a preferable upper limit is 300 micrometers. If the thickness is less than 80 μm, the strength of the above-mentioned base material is reduced, and it may be broken when a strong impact is applied. When the thickness exceeds 300 μm, the flexibility of the substrate is lowered, and when strong impact is applied, the substrate may be peeled off at the interface with the pressure-sensitive adhesive layer, and adhesion is made along the shape of the adherend. May be difficult to bond.
上記アクリル粘着剤層は、動的粘弾性測定から求められるガラス転移温度Ｔｇの下限が５℃、上限が１８℃である。アクリル粘着剤層のガラス転移温度Ｔｇをこの範囲に調整することにより、特に両面粘着テープの粘着力を向上させることができる。上記ガラス転移温度Ｔｇの好ましい下限は１０℃、好ましい上限は１４℃である。 The lower limit of the glass transition temperature Tg determined by dynamic viscoelasticity measurement is 5 ° C. and the upper limit is 18 ° C. in the acrylic pressure-sensitive adhesive layer. By adjusting the glass transition temperature Tg of the acrylic pressure-sensitive adhesive layer to this range, the adhesion of the double-sided pressure-sensitive adhesive tape can be particularly improved. The preferable lower limit of the glass transition temperature Tg is 10 ° C., and the preferable upper limit is 14 ° C.
上記アクリル粘着剤層は、動的粘弾性測定から求められる２３℃における貯蔵弾性率Ｇ’の下限が２×１０５Ｐａ、上限が９×１０５Ｐａである。上記アクリル粘着剤層の２０℃における貯蔵弾性率Ｇ’をこの範囲に調整することにより、特に両面粘着テープの粘着力を向上させることができる。
なお、ガラス転移温度Ｔｇ及び２３℃における貯蔵弾性率Ｇ’は、動的粘弾性測定装置（例えば、アイティー計測制御社製のＤＶＡ−２００）を用いて、周波数１０Ｈｚ、昇温速度３℃／ｍｉｎで−４０℃から１４０℃まで測定を行いことにより求めることができる。
In the acrylic pressure-sensitive adhesive layer, the lower limit of the storage elastic modulus G ′ at 23 ° C. determined from dynamic viscoelasticity measurement is 2 × 10 5 Pa and the upper limit is 9 × 10 5 Pa. By adjusting the storage elastic modulus G ′ at 20 ° C. of the acrylic pressure-sensitive adhesive layer in this range, the adhesion of the double-sided pressure-sensitive adhesive tape can be particularly improved.
The glass transition temperature Tg and the storage elastic modulus G ′ at 23 ° C. have a frequency of 10 Hz and a temperature rising rate of 3 ° C. using a dynamic viscoelasticity measuring apparatus (for example, DVA-200 manufactured by IT Measurement & Control Corporation). It can obtain | require by measuring from -40 degreeC to 140 degreeC by min.
上記アクリル粘着剤層のガラス転移温度Ｔｇ及び２３℃における貯蔵弾性率Ｇ’を目的とする範囲に調整する方法として、例えば、アクリル共重合体の組成、重量平均分子量、分子量分布等を調整する方法、異なる組成、重量平均分子量、分子量分布等のアクリル共重合体を混合する方法、粘着付与樹脂の軟化点、含有量等を調整する方法、上記アクリル粘着剤層の架橋度を調整する方法等が挙げられる。 As a method of adjusting the glass transition temperature Tg of the above-mentioned acrylic pressure-sensitive adhesive layer and the storage elastic modulus G 'at 23 ° C., for example, a method of adjusting the composition, weight average molecular weight, molecular weight distribution etc. of acrylic copolymer Method of mixing acrylic copolymers such as different composition, weight average molecular weight, molecular weight distribution, etc., method of adjusting softening point of tackifying resin, content etc., method of adjusting crosslinking degree of the above acrylic pressure-sensitive adhesive layer, etc. It can be mentioned.
上記アクリル粘着剤層を構成するアクリル共重合体は、ブチルアクリレートと２−エチルヘキシルアクリレートとを含むモノマー混合物を共重合して得られることが好ましい。
全モノマー混合物に占めるブチルアクリレートの好ましい含有量は、４０〜８０重量％である。ブチルアクリレートの含有量が４０重量％未満であると、上記アクリル粘着剤層が柔らかくなりすぎて凝集力が低下し、両面粘着テープのせん断粘着力が低下することがある。ブチルアクリレートの含有量が８０重量％を超えると、上記アクリル粘着剤層が硬くなって粘着力又はタックが低下し、両面粘着テープのせん断粘着力が低下することがある。
全モノマー混合物に占める２−エチルヘキシルアクリレートの好ましい含有量は、１０〜４０重量％である。２−エチルヘキシルアクリレートの含有量が１０重量％未満であると、上記アクリル粘着剤層の粘着力が低下し、両面粘着テープのせん断粘着力が低下することがある。２−エチルヘキシルアクリレートの含有量が４０重量％を超えると、上記アクリル粘着剤層が柔らかくなりすぎて凝集力が低下し、両面粘着テープのせん断粘着力が低下することがある。
It is preferable that the acrylic copolymer which comprises the said acrylic adhesive layer is obtained by copolymerizing the monomer mixture containing a butyl acrylate and 2-ethylhexyl acrylate.
The preferred content of butyl acrylate in the total monomer mixture is 40 to 80% by weight. When the content of butyl acrylate is less than 40% by weight, the above-mentioned acrylic pressure-sensitive adhesive layer becomes so soft that the cohesion may be reduced, and the shear adhesion of the double-sided pressure-sensitive adhesive tape may be reduced. When the content of butyl acrylate exceeds 80% by weight, the above-mentioned acrylic pressure-sensitive adhesive layer becomes hard to lower the adhesion or tack, and the shear adhesion of the double-sided pressure-sensitive adhesive tape may be lowered.
The preferred content of 2-ethylhexyl acrylate in the total monomer mixture is 10 to 40% by weight. When the content of 2-ethylhexyl acrylate is less than 10% by weight, the adhesive strength of the acrylic adhesive layer may be reduced, and the shear adhesive strength of the double-sided adhesive tape may be reduced. When the content of 2-ethylhexyl acrylate exceeds 40% by weight, the above-mentioned acrylic pressure-sensitive adhesive layer becomes so soft that the cohesion may be reduced, and the shear adhesion of the double-sided pressure-sensitive adhesive tape may be reduced.
上記モノマー混合物は、必要に応じてブチルアクリレート及び２−エチルヘキシルアクリレート以外の共重合可能な他の重合性モノマーを含んでいてもよい。
上記共重合可能な他の重合性モノマーとして、例えば、（メタ）アクリル酸メチル、（メタ）アクリル酸エチル、（メタ）アクリル酸ｎ−プロピル、（メタ）アクリル酸イソプロピル等のアルキル基の炭素数が１〜３の（メタ）アクリル酸アルキルエステル、メタクリル酸トリデシル、（メタ）アクリル酸ステアリル等のアルキル基の炭素数が１３〜１８の（メタ）アクリル酸アルキルエステル、（メタ）アクリル酸ヒドロキシアルキル、グリセリンジメタクリレート、（メタ）アクリル酸グリシジル、２−メタクリロイルオキシエチルイソシアネート、（メタ）アクリル酸、イタコン酸、無水マレイン酸、クロトン酸、マレイン酸、フマル酸、等の官能性モノマーが挙げられる。
The above-mentioned monomer mixture may optionally contain other copolymerizable polymerizable monomers other than butyl acrylate and 2-ethylhexyl acrylate.
As the other copolymerizable polymerizable monomers, for example, carbon number of alkyl group such as methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate and the like (Meth) acrylic acid alkyl ester having 1 to 3 carbon atoms of 13 to 18 carbon atoms, such as (meth) acrylic acid alkyl ester, tridecyl methacrylate, stearyl (meth) acrylic acid, etc., hydroxyalkyl (meth) acrylate And functional monomers such as glycerin dimethacrylate, glycidyl (meth) acrylate, 2-methacryloyloxyethyl isocyanate, (meth) acrylic acid, itaconic acid, maleic anhydride, crotonic acid, maleic acid, fumaric acid and the like.
上記モノマー混合物を共重合して上記アクリル共重合体を得るには、上記モノマー混合物を、重合開始剤の存在下にてラジカル反応させればよい。上記モノマー混合物をラジカル反応させる方法、即ち、重合方法としては、従来公知の方法が用いられ、例えば、溶液重合（沸点重合又は定温重合）、乳化重合、懸濁重合、塊状重合等が挙げられる。
上記重合開始剤は特に限定されず、例えば、有機過酸化物、アゾ化合物等が挙げられる。上記有機過酸化物として、例えば、１，１−ビス（ｔ−ヘキシルパーオキシ）−３，３，５−トリメチルシクロヘキサン、ｔ−ヘキシルパーオキシピバレート、ｔ−ブチルパーオキシピバレート、２，５−ジメチル−２，５−ビス（２−エチルヘキサノイルパーオキシ）ヘキサン、ｔ−ヘキシルパーオキシ−２−エチルヘキサノエート、ｔ−ブチルパーオキシ−２−エチルヘキサノエート、ｔ−ブチルパーオキシイソブチレート、ｔ−ブチルパーオキシ−３，５，５−トリメチルヘキサノエート、ｔ−ブチルパーオキシラウレート等が挙げられる。上記アゾ化合物として、例えば、アゾビスイソブチロニトリル、アゾビスシクロヘキサンカルボニトリル等が挙げられる。これらの重合開始剤は単独で用いてもよいし、２種以上を併用してもよい。
In order to copolymerize the above-mentioned monomer mixture to obtain the above-mentioned acrylic copolymer, the above-mentioned monomer mixture may be radically reacted in the presence of a polymerization initiator. The method of radically reacting the monomer mixture, that is, the polymerization method may be a conventionally known method, and examples thereof include solution polymerization (boiling point polymerization or constant temperature polymerization), emulsion polymerization, suspension polymerization, bulk polymerization and the like.
The said polymerization initiator is not specifically limited, For example, an organic peroxide, an azo compound, etc. are mentioned. Examples of the organic peroxide include 1,1-bis (t-hexylperoxy) -3,3,5-trimethylcyclohexane, t-hexylperoxypivalate, t-butylperoxypivalate, and 2,5. -Dimethyl-2,5-bis (2-ethylhexanoylperoxy) hexane, t-hexylperoxy-2-ethylhexanoate, t-butylperoxy-2-ethylhexanoate, t-butylperoxy Isobutyrate, t-butylperoxy-3,5,5-trimethylhexanoate, t-butylperoxy laurate and the like can be mentioned. Examples of the azo compound include azobisisobutyronitrile, azobiscyclohexanecarbonitrile and the like. These polymerization initiators may be used alone or in combination of two or more.
上記アクリル共重合体の重量平均分子量（Ｍｗ）は、好ましい下限が４０万、好ましい上限が２００万である。重量平均分子量が４０万未満であると、上記アクリル粘着剤層の凝集力が低下し、両面粘着テープのせん断粘着力が低下することがある。重量平均分子量が２００万を超えると、上記アクリル粘着剤層の粘着力が低下し、両面粘着テープのせん断粘着力が低下することがある。重量平均分子量のより好ましい下限は５０万、より好ましい上限は１５０万である。
重量平均分子量を上記範囲に調整するためには、重合開始剤、重合温度等の重合条件を調整すればよい。
なお、重量平均分子量（Ｍｗ）とは、ＧＰＣ（Ｇｅｌ Ｐｅｒｍｅａｔｉｏｎ Ｃｈｒｏｍａｔｏｇｒａｐｈｙ：ゲルパーミエーションクロマトグラフィ）による標準ポリスチレン換算の重量平均分子量である。
The lower limit of the weight average molecular weight (Mw) of the acrylic copolymer is preferably 400,000, and the upper limit is preferably 2,000,000. When the weight average molecular weight is less than 400,000, the cohesion of the acrylic pressure-sensitive adhesive layer may be reduced, and the shear adhesion of the double-sided pressure-sensitive adhesive tape may be reduced. When the weight average molecular weight exceeds 2,000,000, the adhesive strength of the above-mentioned acrylic adhesive layer may be reduced, and the shear adhesive strength of the double-sided adhesive tape may be reduced. The more preferable lower limit of the weight average molecular weight is 500,000, and the more preferable upper limit is 1.5 million.
In order to adjust the weight average molecular weight to the above range, polymerization conditions such as a polymerization initiator, polymerization temperature and the like may be adjusted.
In addition, a weight average molecular weight (Mw) is a weight average molecular weight of standard polystyrene conversion by GPC (Gel Permeation Chromatography: gel permeation chromatography).
上記アクリル粘着剤層は、粘着付与樹脂を含有してもよい。
上記粘着付与樹脂として、例えば、ロジンエステル系樹脂、水添ロジン系樹脂、テルペン系樹脂、テルペンフェノール系樹脂、クマロンインデン系樹脂、脂環族飽和炭化水素系樹脂、Ｃ５系石油樹脂、Ｃ９系石油樹脂、Ｃ５−Ｃ９共重合系石油樹脂等が挙げられる。これらの粘着付与樹脂は単独で用いてもよいし、２種以上を併用してもよい。
The acrylic pressure-sensitive adhesive layer may contain a tackifying resin.
As the tackifying resin, for example, rosin ester resin, hydrogenated rosin resin, terpene resin, terpene phenol resin, coumarone indene resin, alicyclic saturated hydrocarbon resin, C5 petroleum resin, C9 resin A petroleum resin, C5-C9 copolymer-based petroleum resin, etc. are mentioned. These tackifying resins may be used alone or in combination of two or more.
上記粘着付与樹脂の含有量は特に限定されないが、上記アクリル共重合体１００重量部に対する好ましい下限は１０重量部、好ましい上限は６０重量部である。上記粘着付与樹脂の含有量が１０重量部未満であると、上記アクリル粘着剤層の粘着力が低下し、両面粘着テープのせん断粘着力が低下することがある。上記粘着付与樹脂の含有量が６０重量部を超えると、上記アクリル粘着剤層が硬くなって粘着力又はタックが低下し、両面粘着テープのせん断粘着力が低下することがある。 The content of the tackifier resin is not particularly limited, but a preferable lower limit is 10 parts by weight and a preferable upper limit is 60 parts by weight with respect to 100 parts by weight of the acrylic copolymer. If the content of the tackifier resin is less than 10 parts by weight, the adhesive strength of the acrylic adhesive layer may be reduced, and the shear adhesive strength of the double-sided adhesive tape may be reduced. When the content of the tackifier resin exceeds 60 parts by weight, the acrylic pressure-sensitive adhesive layer may be hardened to reduce the adhesive strength or the tack, and the shear adhesive strength of the double-sided adhesive tape may be reduced.
上記アクリル粘着剤層は、架橋剤が添加されることにより上記アクリル粘着剤層を構成する樹脂（上記アクリル共重合体及び／又は上記粘着付与樹脂）の主鎖間に架橋構造が形成されていることが好ましい。
上記架橋剤は特に限定されず、例えば、イソシアネート系架橋剤、アジリジン系架橋剤、エポキシ系架橋剤、金属キレート型架橋剤等が挙げられる。なかでも、イソシアネート系架橋剤が好ましい。上記アクリル粘着剤層にイソシアネート系架橋剤が添加されることで、イソシアネート系架橋剤のイソシアネート基と上記アクリル粘着剤層を構成する樹脂中のアルコール性水酸基とが反応して、上記アクリル粘着剤層の架橋が緩くなる。従って、上記アクリル粘着剤層は、断続的に加わる剥離応力を分散させることができ、両面粘着テープのせん断粘着力がより向上する。
上記架橋剤の添加量は、上記アクリル共重合体１００重量部に対して０．０１〜１０重量部が好ましく、０．１〜３重量部がより好ましい。
In the acrylic pressure-sensitive adhesive layer, a crosslinking structure is formed between the main chains of the resin (the acrylic copolymer and / or the tackifying resin) constituting the acrylic pressure-sensitive adhesive layer by the addition of a crosslinking agent. Is preferred.
The said crosslinking agent is not specifically limited, For example, an isocyanate type crosslinking agent, an aziridine type crosslinking agent, an epoxy type crosslinking agent, a metal chelate type crosslinking agent etc. are mentioned. Among these, isocyanate crosslinking agents are preferred. By the addition of an isocyanate-based crosslinking agent to the acrylic pressure-sensitive adhesive layer, the isocyanate group of the isocyanate-based crosslinking agent reacts with the alcoholic hydroxyl group in the resin constituting the acrylic pressure-sensitive adhesive layer, and the acrylic pressure-sensitive adhesive layer Cross-links loose. Therefore, the said acrylic adhesive layer can disperse the peeling stress added intermittently, and the shear adhesive force of a double-sided adhesive tape improves more.
The amount of addition of the crosslinking agent is preferably 0.01 to 10 parts by weight, and more preferably 0.1 to 3 parts by weight with respect to 100 parts by weight of the acrylic copolymer.
上記アクリル粘着剤層の架橋度は５〜６０重量％が好ましく、１０〜５０重量％がより好ましく、１５〜４０重量％が特に好ましい。
なお、アクリル粘着剤層の架橋度は、アクリル粘着剤層をＷ１（ｇ）採取し、このアクリル粘着剤層を酢酸エチル中に２３℃にて２４時間浸漬して不溶解分を２００メッシュの金網で濾過し、金網上の残渣を真空乾燥して乾燥残渣の重量Ｗ２（ｇ）を測定し、下記式（１）により算出する。
架橋度（重量％）＝１００×Ｗ２／Ｗ１ （１）
The crosslinking degree of the acrylic pressure-sensitive adhesive layer is preferably 5 to 60% by weight, more preferably 10 to 50% by weight, and particularly preferably 15 to 40% by weight.
The degree of cross-linking of the acrylic adhesive layer was determined by collecting W1 (g) of the acrylic adhesive layer, immersing the acrylic adhesive layer in ethyl acetate for 24 hours at 23 ° C. The residue on the wire mesh is vacuum dried, and the dry residue weight W2 (g) is measured, and calculated by the following formula (1).
Degree of crosslinking (% by weight) = 100 × W2 / W1 (1)
上記アクリル粘着剤層の厚みは特に限定されないが、片面のアクリル粘着剤層の厚みが１０〜１００μｍであることが好ましい。上記アクリル粘着剤層の厚みが１０μｍ未満であると、両面粘着テープの粘着力や耐衝撃性が低下することがある。上記アクリル粘着剤層の厚みが１００μｍを超えると、両面粘着テープのリワーク性又は再剥離性が損なわれることがある。 Although the thickness of the said acrylic adhesive layer is not specifically limited, It is preferable that the thickness of the acrylic adhesive layer of single side | surface is 10-100 micrometers. The adhesive force and impact resistance of a double-sided adhesive tape may fall that the thickness of the said acrylic adhesive layer is less than 10 micrometers. When the thickness of the said acrylic adhesive layer exceeds 100 micrometers, the rework property or re-peelability of a double-sided adhesive tape may be impaired.
本発明の両面粘着テープは、両面粘着テープの総厚みが１００〜４００μｍであることが好ましい。両面粘着テープの総厚みが１００μｍ未満であると、両面粘着テープの粘着力や耐衝撃性が低下することがある。両面粘着テープの総厚みが４００μｍを超えると、携帯電子機器を構成する部品の接着固定、車載部品の接着固定等の用途に適さなくなることがある。両面粘着テープの総厚みのより好ましい下限は１５０μｍ、より好ましい上限は３００μｍである。 In the double-sided pressure-sensitive adhesive tape of the present invention, the total thickness of the double-sided pressure-sensitive adhesive tape is preferably 100 to 400 μm. The adhesive force and impact resistance of a double-sided adhesive tape may fall that the total thickness of a double-sided adhesive tape is less than 100 micrometers. If the total thickness of the double-sided pressure-sensitive adhesive tape exceeds 400 μm, it may not be suitable for applications such as adhesion and fixation of parts constituting portable electronic devices and adhesion and fixation of in-vehicle parts. The more preferable lower limit of the total thickness of the double-sided pressure-sensitive adhesive tape is 150 μm, and the more preferable upper limit is 300 μm.
本発明の両面粘着テープの製造方法として、例えば、以下のような方法が挙げられる。
まず、アクリル共重合体、粘着付与樹脂、必要に応じて架橋剤等に溶剤を加えて粘着剤Ａの溶液を作製して、この粘着剤Ａの溶液を基材の表面に塗布し、溶液中の溶剤を完全に乾燥除去してアクリル粘着剤層Ａを形成する。次に、形成されたアクリル粘着剤層Ａの上に離型フィルムをその離型処理面がアクリル粘着剤層Ａに対向した状態に重ね合わせる。
次いで、上記離型フィルムとは別の離型フィルムを用意し、この離型フィルムの離型処理面に粘着剤Ｂの溶液を塗布し、溶液中の溶剤を完全に乾燥除去することにより、離型フィルムの表面にアクリル粘着剤層Ｂが形成された積層フィルムを作製する。得られた積層フィルムをアクリル粘着剤層Ａが形成された基材の裏面に、アクリル粘着剤層Ｂが基材の裏面に対向した状態に重ね合わせて積層体を作製する。そして、上記積層体をゴムローラ等によって加圧することによって、基材の両面にアクリル粘着剤層を有し、かつ、アクリル粘着剤層の表面が離型フィルムで覆われた両面粘着テープを得ることができる。
As a manufacturing method of the double-sided adhesive tape of this invention, the following methods are mentioned, for example.
First, a solvent is added to an acrylic copolymer, a tackifying resin, a cross-linking agent if necessary, etc. to prepare a solution of adhesive A, and the solution of adhesive A is applied to the surface of a substrate, and in the solution The solvent is completely removed by drying to form an acrylic pressure-sensitive adhesive layer A. Next, a release film is superimposed on the formed acrylic pressure-sensitive adhesive layer A in a state in which the release-treated surface thereof faces the acrylic pressure-sensitive adhesive layer A.
Next, a release film different from the above release film is prepared, a solution of adhesive B is applied to the release-treated surface of the release film, and the solvent in the solution is completely removed by drying. A laminated film in which the acrylic pressure-sensitive adhesive layer B is formed on the surface of the mold film is produced. The resulting laminated film is laminated on the back surface of the base on which the acrylic pressure-sensitive adhesive layer A is formed, in a state where the acrylic pressure-sensitive adhesive layer B is opposed to the back surface of the base, to prepare a laminate. Then, by pressing the laminate with a rubber roller or the like, it is possible to obtain a double-sided pressure-sensitive adhesive tape having an acrylic pressure-sensitive adhesive layer on both sides of the substrate and having the surface of the acrylic pressure-sensitive adhesive layer covered with a release film. it can.
また、同様の要領で積層フィルムを２組作製し、これらの積層フィルムを基材の両面のそれぞれに、積層フィルムのアクリル粘着剤層を基材に対向させた状態に重ね合わせて積層体を作製し、この積層体をゴムローラ等によって加圧することによって、基材の両面にアクリル粘着剤層を有し、かつ、アクリル粘着剤層の表面が離型フィルムで覆われた両面粘着テープを得てもよい。 Moreover, two sets of laminated films are produced in the same way, these laminated films are superimposed on each of the both sides of a base material in the state which made the acrylic adhesive layer of a laminated film face the base material, and a laminated body is produced. By pressing the laminate with a rubber roller etc., a double-sided pressure-sensitive adhesive tape having an acrylic pressure-sensitive adhesive layer on both sides of the substrate and having the surface of the acrylic pressure-sensitive adhesive layer covered with a release film Good.
本発明の両面粘着テープの用途は特に限定されないが、電子機器部品の固定や車載部品の固定に特に好適に用いることができる。具体的には、大型の携帯電子機器における電子機器部品の接着固定、車載部品（例えば、車載用パネル）の接着固定等に、本発明の両面粘着テープを用いることができる。
これらの用途における本発明の両面粘着テープの形状は特に限定されないが、長方形、額縁状、円形、楕円形、ドーナツ型等が挙げられる。
Although the application of the double-sided pressure-sensitive adhesive tape of the present invention is not particularly limited, it can be particularly suitably used for fixing electronic device parts and for fixing on-vehicle parts. Specifically, the double-sided pressure-sensitive adhesive tape of the present invention can be used for adhesion and fixation of electronic device parts in large-sized portable electronic devices, adhesion and fixation of in-vehicle parts (for example, in-vehicle panels).
The shape of the double-sided pressure-sensitive adhesive tape of the present invention in these applications is not particularly limited, and examples thereof include a rectangle, a frame, a circle, an ellipse, and a donut shape.
本発明によれば、電子機器部品固定用途や車輌部品固定用途に好適に用いることができる、高い粘着力、耐衝撃性、耐電圧性を発揮できる両面粘着テープを提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the double-sided adhesive tape which can exhibit high adhesive force, impact resistance, and voltage resistance which can be used suitably for electronic device component fixing applications and vehicle components fixing applications can be provided.
以下に実施例を挙げて本発明の態様を更に詳しく説明するが、本発明はこれら実施例にのみ限定されるものではない。 EXAMPLES The embodiments of the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.
（粘着剤（Ａ）の調製）
温度計、攪拌機、冷却管を備えた反応器にブチルアクリレート７８重量部、２−エチルヘキシルアクリレート１９重量部、アクリル酸３重量部、２−ヒドロキシエチルアクリレート０．２重量部、及び、酢酸エチル８０重量部を加え、窒素置換した後、反応器を加熱して還流を開始した。続いて、上記反応器内に、重合開始剤としてアゾビスイソブチロニトリル０．１重量部を添加した。５時間還流させて、アクリル共重合体（ａ）の溶液を得た。得られたアクリル共重合体（ａ）について、カラムとしてＷａｔｅｒ社製「２６９０ Ｓｅｐａｒａｔｉｏｎｓ Ｍｏｄｅｌ」を用いてＧＰＣ法により重量平均分子量を測定したところ、７１万であった。
得られたアクリル共重合体（ａ）の溶液に含まれるアクリル共重合体（ａ）の固形分１００重量部に対して、軟化点１５０℃の重合ロジンエステル１５重量部、軟化点１５０℃のテルペンフェノール１０重量部、軟化点７０℃のロジンエステル１０重量部、酢酸エチル（不二化学薬品社製）１２５重量部、イソシアネート系架橋剤（日本ポリウレタン社製 商品名「コロネートＬ４５」）２．２重量部を添加し、攪拌して、粘着剤（Ａ）を得た。
(Preparation of adhesive (A))
In a reactor equipped with a thermometer, a stirrer and a condenser, 78 parts by weight of butyl acrylate, 19 parts by weight of 2-ethylhexyl acrylate, 3 parts by weight of acrylic acid, 0.2 parts by weight of 2-hydroxyethyl acrylate, and 80 parts by weight of ethyl acetate After adding the parts and purging with nitrogen, the reactor was heated to start refluxing. Subsequently, 0.1 parts by weight of azobisisobutyronitrile as a polymerization initiator was added to the reactor. Refluxing was performed for 5 hours to obtain a solution of acrylic copolymer (a). The weight average molecular weight of the obtained acrylic copolymer (a) was 710,000 when measured by a GPC method using “2690 Separations Model” manufactured by Water Corporation as a column.
15 parts by weight of polymerized rosin ester having a softening point of 150 ° C. and terpene having a softening point of 150 ° C. with respect to 100 parts by weight of the solid content of the acrylic copolymer (a) contained in the obtained solution of acrylic copolymer (a) 10 parts by weight of phenol, 10 parts by weight of rosin ester having a softening point of 70 ° C., 125 parts by weight of ethyl acetate (manufactured by Fuji Chemical Co., Ltd.), 2.2 parts by weight of isocyanate crosslinking agent (trade name "Coronato L45" manufactured by Nippon Polyurethane Co., Ltd.) Part was added and stirred to obtain a pressure-sensitive adhesive (A).
（粘着剤（Ｂ）の調製）
モノマーとしてブチルアクリレート６５重量部、２−エチルヘキシルアクリレート３２重量部、アクリル酸３重量部、２−ヒドロキシエチルアクリレート０．２重量部、を用い、重合開始剤としてアゾビスイソブチロニトリル０．０６重量部を添加したこと以外はアクリル共重合体（ａ）の調製方法と同様にして、重量平均分子量１４４万のアクリル共重合体（ｂ）の溶液を得た。得られたアクリル共重合体（ｂ）の溶液を用いたこと以外は粘着剤（Ａ）の調製方法と同様にして、粘着剤（Ｂ）を得た。
(Preparation of adhesive (B))
65 parts by weight of butyl acrylate, 32 parts by weight of 2-ethylhexyl acrylate, 3 parts by weight of acrylic acid, 0.2 parts by weight of 2-hydroxyethyl acrylate as monomers, and 0.06 parts by weight of azobisisobutyronitrile as a polymerization initiator A solution of an acrylic copolymer (b) having a weight average molecular weight of 1,440,000 was obtained in the same manner as the preparation method of the acrylic copolymer (a) except that part was added. A pressure-sensitive adhesive (B) was obtained in the same manner as in the preparation of the pressure-sensitive adhesive (A) except that the obtained solution of the acrylic copolymer (b) was used.
（粘着剤（Ｃ）の調製）
モノマーとしてブチルアクリレート９７重量部とし、２−エチルヘキシルアクリレートを使用しなかったこと以外はアクリル共重合体（ａ）の調製方法と同様にして、重量平均分子量８９万のアクリル共重合体（ｃ）の溶液を得た。
得られたアクリル共重合体（ｃ）の溶液を用いたこと以外は粘着剤（Ａ）の調製方法と同様にして、粘着剤（Ｃ）を得た。
(Preparation of adhesive (C))
An acrylic copolymer (c) having a weight average molecular weight of 890,000 was prepared in the same manner as in the preparation of the acrylic copolymer (a) except that 97 parts by weight of butyl acrylate was used as a monomer and 2-ethylhexyl acrylate was not used. A solution was obtained.
A pressure-sensitive adhesive (C) was obtained in the same manner as in the preparation of the pressure-sensitive adhesive (A) except that the obtained solution of the acrylic copolymer (c) was used.
（粘着剤（Ｄ）の調製）
粘着付与樹脂として軟化点１５０℃の重合ロジンエステル１５重量部、軟化点１５０℃のテルペンフェノール１８重量部、軟化点７０℃のロジンエステル１５重量部を用いたこと以外は粘着剤（Ａ）の調製方法と同様にして、粘着剤（Ｄ）を得た。
(Preparation of adhesive (D))
Preparation of adhesive (A) except using 15 parts by weight of polymerized rosin ester having a softening point of 150 ° C., 18 parts by weight of terpene phenol having a softening point of 150 ° C., and 15 parts by weight of rosin ester having a softening point of 70 ° C. An adhesive (D) was obtained in the same manner as in the method.
（粘着剤（Ｅ）の調製）
粘着付与樹脂として軟化点１３５℃の重合ロジンエステル１２重量部、軟化点１５０℃のテルペンフェノール１０重量部、軟化点１００℃のロジンエステル８重量部を用いたこと以外は粘着剤（Ａ）の調製方法と同様にして、粘着剤（Ｅ）を得た。
(Preparation of adhesive (E))
Preparation of adhesive (A) except using 12 parts by weight of polymerized rosin ester having a softening point of 135 ° C., 10 parts by weight of terpene phenol having a softening point of 150 ° C., and 8 parts by weight of rosin ester having a softening point of 100 ° C. An adhesive (E) was obtained in the same manner as in the method.
（粘着剤（Ｆ）の調製）
粘着付与樹脂として軟化点１３５℃の重合ロジンエステル１０重量部、軟化点１３０℃のテルペンフェノール８重量部、軟化点７０℃のロジンエステル６重量部を用いたこと以外は粘着剤（Ａ）の調製方法と同様にして、粘着剤（Ｆ）を得た。
(Preparation of pressure sensitive adhesive (F))
Preparation of adhesive (A) except using 10 parts by weight of polymerized rosin ester having a softening point of 135 ° C., 8 parts by weight of terpene phenol having a softening point of 130 ° C. and 6 parts by weight of rosin ester having a softening point of 70 ° C. An adhesive (F) was obtained in the same manner as in the method.
（粘着剤（Ｇ）の調製）
粘着付与樹脂として軟化点１５０℃の重合ロジンエステル１５重量部を用いたこと以外は粘着剤（Ａ）の調製方法と同様にして、粘着剤（Ｇ）を得た。
(Preparation of adhesive (G))
A pressure-sensitive adhesive (G) was obtained in the same manner as in the preparation of the pressure-sensitive adhesive (A) except that 15 parts by weight of a polymerized rosin ester having a softening point of 150 ° C. was used as the tackifying resin.
（粘着剤（Ｈ）の調製）
ブチルアクリレートの添加量を７７重量部に変更し、更に、２−エチルヘキシルアクリレート１９重量部の代わりにメチルメタクリレート２０重量部を添加したこと以外はアクリル共重合体（ａ）の調製方法と同様にして、重量平均分子量７９万のアクリル共重合体（ｈ）の溶液を得た。
得られたアクリル共重合体（ｈ）の溶液を用いたこと、粘着付与樹脂として軟化点１３５℃の重合ロジンエステル２０重量部を用いたこと以外は粘着剤（Ａ）の調製方法と同様にして、粘着剤（Ｈ）を得た。
(Preparation of pressure sensitive adhesive (H))
In the same manner as in the preparation of the acrylic copolymer (a), except that the addition amount of butyl acrylate was changed to 77 parts by weight and 20 parts by weight of methyl methacrylate was added instead of 19 parts by weight of 2-ethylhexyl acrylate. , A solution of an acrylic copolymer (h) having a weight average molecular weight of 790,000 was obtained.
In the same manner as in the preparation of the pressure-sensitive adhesive (A) except that the solution of the obtained acrylic copolymer (h) was used, and 20 parts by weight of the polymerized rosin ester having a softening point of 135 ° C. was used as the tackifying resin. , An adhesive (H) was obtained.
（実施例１）
厚み１５０μｍの離型紙を用意し、この離型紙の離型処理面に粘着剤（Ａ）を塗布し、１００℃で５分間乾燥させることにより、厚み５０μｍのアクリル粘着剤層を形成した。このアクリル粘着剤層を、表１に示す平均セル径、発泡倍率、密度、２５％圧縮強度及び厚みを有するポリオレフィン発泡体からなる基材の表面と貼り合わせた。次いで、同様の要領で、このポリオレフィン発泡体からなる基材の反対の表面にも上記と同じアクリル粘着剤層を貼り合わせた。これにより、厚み１５０μｍの離型紙で覆われた表１に示す総厚みの両面粘着テープを得た。
得られた両面粘着テープのアクリル粘着剤層について、動的粘弾性測定装置（アイティー計測制御社製のＤＶＡ−２００）を用いて、周波数１０Ｈｚ、昇温速度３℃／ｍｉｎで−４０℃から１４０℃まで測定を行い、ガラス転移温度Ｔｇ、２３℃における貯蔵弾性率Ｇ’及び損失正接ｔａｎδを算出して表１に示した。
Example 1
A release paper having a thickness of 150 μm was prepared, an adhesive (A) was applied to the release-treated surface of the release paper, and dried at 100 ° C. for 5 minutes to form an acrylic adhesive layer having a thickness of 50 μm. This acrylic pressure-sensitive adhesive layer was bonded to the surface of a base material made of a polyolefin foam having an average cell diameter, a foaming ratio, a density, a 25% compressive strength and a thickness shown in Table 1. Then, in the same manner, the same acrylic adhesive layer as described above was bonded to the opposite surface of the substrate made of this polyolefin foam. This obtained the double-sided adhesive tape of the total thickness shown in Table 1 covered with the 150-micrometer-thick release paper.
About the acrylic adhesive layer of the obtained double-sided adhesive tape, from -40 ° C at a frequency of 10 Hz and a heating rate of 3 ° C / min using a dynamic viscoelasticity measuring apparatus (DVA-200 manufactured by IT Measurement & Control Corporation) The measurement was carried out up to 140 ° C., and the glass transition temperature Tg, the storage elastic modulus G ′ at 23 ° C. and the loss tangent tan δ were calculated and shown in Table 1.
（実施例２〜７、９、１０、参考例８、比較例１〜７）
基材又はアクリル粘着剤層を表１及び表２に示したものに代えた以外は実施例１と同様にして両面粘着テープを得た。
(Examples 2 to 7, 9, 10 , Reference Example 8 and Comparative Examples 1 to 7)
A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1, except that the substrate or the acrylic pressure-sensitive adhesive layer was replaced with those shown in Tables 1 and 2.
＜評価＞
実施例、比較例で得られた両面粘着テープについて以下の評価を行った。結果を表１及び表２に示した。
<Evaluation>
The following evaluation was performed about the double-sided adhesive tape obtained by the Example and the comparative example. The results are shown in Tables 1 and 2.
（１）耐落下衝撃性の評価
図１に、両面粘着テープの落下衝撃試験の模式図を示す。得られた両面粘着テープを外径が幅４６ｍｍ、長さ６１ｍｍ、内径が幅４４．６ｍｍ、長さ５９．６ｍｍに打ち抜き、幅０．７ｍｍの枠状の試験片を作製した。次いで、図１（ａ）に示すように、中央部分に幅３８ｍｍ、長さ５０ｍｍの四角い穴のあいた厚さ２ｍｍのポリカーボネート板３に対して離型紙を剥がした試験片１を四角い穴がほぼ中央に位置するように貼り付けた後、試験片１の上面から幅５０ｍｍ、長さ７５ｍｍ、厚さ４ｍｍのガラス板２を試験片１がほぼ中央に位置するように貼り付け、試験装置を組み立てた。
その後、試験装置の上面に位置するポリカーボネート板側から５ｋｇｆの圧力を１０秒間加えて上下に位置するポリカーボネート板と試験片とを圧着し、常温で２４時間放置した。
(1) Evaluation of Drop Impact Resistance FIG. 1 shows a schematic view of a drop impact test of a double-sided adhesive tape. The obtained double-sided pressure-sensitive adhesive tape was punched into an outer diameter of 46 mm, a length of 61 mm, an inner diameter of 44.6 mm, and a length of 59.6 mm to prepare a frame-shaped test piece of 0.7 mm in width. Next, as shown in FIG. 1 (a), a
Thereafter, a pressure of 5 kgf was applied for 10 seconds from the side of the polycarbonate plate located on the upper surface of the test device, and the polycarbonate plates and the test pieces located above and below were pressure-bonded to each other.
図１（ｂ）に示すように、作製した試験装置を裏返して支持台に固定し、四角い穴を通過する大きさの１５０ｇの重さの鉄球４を四角い穴を通過するように落とした。鉄球を落とす高さを徐々に高くしていき、鉄球の落下により加わった衝撃により試験片とガラス板が剥がれた時の鉄球を落した高さを計測した。
得られた計測値をもとに、以下の基準により耐落下衝撃性を判定した。
○：剥離時の鉄球の高さが５０ｃｍ以上
×：剥離時の鉄球の高さが５０ｃｍ未満
As shown in FIG. 1 (b), the manufactured test device was turned over and fixed to a support, and an iron ball 4 having a weight of 150 g passing through the square hole was dropped so as to pass through the square hole. The height at which the iron ball was dropped was gradually increased, and the height at which the iron ball dropped when the test piece and the glass plate were peeled off by the impact applied by the drop of the iron ball was measured.
Based on the obtained measured values, the drop impact resistance was determined according to the following criteria.
○: The height of the iron ball at peeling is 50 cm or more ×: The height of the iron ball at peeling is less than 50 cm
（２）ＰＵＳＨ粘着力の評価
図２に、両面粘着テープのＰＵＳＨ粘着力試験の模式図を示す。得られた両面粘着テープを外径が幅４６ｍｍ、長さ６１ｍｍ、内径が幅４４．６ｍｍ、長さ５９．６ｍｍに打ち抜き、幅０．７ｍｍの枠状の試験片を作製した。次いで、図２（ａ）に示すように、中央部分に幅３８ｍｍ、長さ５０ｍｍの四角い穴のあいた厚さ２ｍｍのポリカーボネート板３に対して離型紙を剥がした試験片１を四角い穴がほぼ中央に位置するように貼り付けた後、試験片１の上面から幅５０ｍｍ、長さ７５ｍｍ、厚さ４ｍｍのガラス板２を試験片１がほぼ中央に位置するように貼り付け、試験装置を組み立てた。
その後、試験装置の上面に位置するポリカーボネート板側から５ｋｇｆの圧力を１０秒間加えて上下に位置するポリカーボネート板と試験片とを圧着し、常温で２４時間放置した。
(2) Evaluation of PUSH adhesive force In FIG. 2, the schematic diagram of the PUSH adhesive force test of a double-sided adhesive tape is shown. The obtained double-sided pressure-sensitive adhesive tape was punched into an outer diameter of 46 mm, a length of 61 mm, an inner diameter of 44.6 mm, and a length of 59.6 mm to prepare a frame-shaped test piece of 0.7 mm in width. Next, as shown in FIG. 2 (a), the squared hole of the
Thereafter, a pressure of 5 kgf was applied for 10 seconds from the side of the polycarbonate plate located on the upper surface of the test device, and the polycarbonate plates and the test pieces located above and below were pressure-bonded to each other.
図２（ｂ）に示すように、作製した試験装置を裏返して支持台に固定し、四角い穴を通して１０ｍｍ／ｍｉｎの速度でゆっくりと荷重５をかけていき、荷重により試験片とガラス板が剥がれた時の荷重の値を計測した。
得られた計測値をもとに、以下の基準によりＰＵＳＨ粘着力を判定した。
○：剥離時の荷重が５０Ｎ以上
×：剥離時の荷重が５０Ｎ未満
As shown in FIG. 2 (b), the manufactured test device is turned over and fixed to a support, and a load 5 is slowly applied at a speed of 10 mm / min through a square hole, and the test piece and the glass plate are peeled off by the load. The value of the load was measured.
Based on the obtained measured values, PUSH adhesion was determined according to the following criteria.
○: Load at peeling is 50 N or more ×: Load at peeling is less than 50 N
（３）耐電圧性の評価
図３に、両面粘着テープの耐電圧性の評価方法を示す模式図を示す。
図３（ａ）に示すように、０．７ｍｍの幅の線状に打ち抜いた両面粘着テープ６を、２枚の厚さ２ｍｍのアクリル板７に挟み込んだ。両面粘着テープ６の幅方向に電圧がかかるように、アクリル板の両側の隙間から２枚のアルミ板８を差し込み、両面粘着テープ６に接触させた。次いで、各々のアルミ板８に正極及び負極を接続し、耐電圧試験機ＴＯＳ５１０１（菊水電子工業社製、最大電圧１２ＫＶ）を用いて直流にて試験片の厚み方向に電圧を印加し、その電圧で５秒間通電がないことを確認した後、０．５ＫＶ刻みで印加電圧を上昇させていき、通電したときの電圧を求めた。
得られた計測値をもとに、以下の基準により耐電圧性を判定した。
○：通電したときの電圧が８ｋＶ以上
×：通電したときの電圧が８ｋＶ未満
(3) Evaluation of voltage resistance In FIG. 3, the schematic diagram which shows the evaluation method of the voltage resistance of a double-sided adhesive tape is shown.
As shown in FIG. 3A, the double-sided
Based on the obtained measured value, the withstand voltage was determined according to the following criteria.
○: The voltage when energized is 8 kV or more ×: The voltage when energized is less than 8 kV
本発明によれば、電子機器部品固定用途や車輌部品固定用途に好適に用いることができる、高い粘着力、耐衝撃性、耐電圧性を発揮できる両面粘着テープを提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the double-sided adhesive tape which can exhibit high adhesive force, impact resistance, and voltage resistance which can be used suitably for electronic device component fixing applications and vehicle components fixing applications can be provided.
１ 両面粘着テープ試験片（枠状）
２ ガラス板
３ ポリカーボネート板
４ 鉄球
５ 荷重
６ 両面粘着テープ試験片（線状）
７ アクリル板
８ アルミ板
1 Double-sided adhesive tape test piece (frame shape)
2
7
Claims (8)
前記ポリオレフィン発泡体からなる基材は、ＭＤ方向及びＴＤ方向における平均セル径がそれぞれ８０μｍ未満、発泡倍率が１．４〜２．２倍であり、
前記アクリル粘着剤層は、動的粘弾性測定から求められるガラス転移温度Ｔｇが５〜１８℃、２３℃における貯蔵弾性率Ｇ’が２×１０５〜９×１０５Ｐａであり、
前記アクリル粘着剤層を構成するアクリル共重合体は、共重合成分としてブチルアクリレートを４０〜８０重量％含む
ことを特徴とする両面粘着テープ。 A double-sided pressure-sensitive adhesive tape having an acrylic pressure-sensitive adhesive layer on both sides of a polyolefin foam substrate,
The base material made of the polyolefin foam has an average cell diameter in the MD direction and the TD direction of less than 80 μm and an expansion ratio of 1.4 to 2.2 times, respectively.
The acrylic pressure-sensitive adhesive layer has a glass transition temperature Tg as determined from the dynamic viscoelasticity measurement is 5 to 18 ° C., Ri storage modulus G at 23 ° C. 'is 2 × 10 5 ~9 × 10 5 Pa der,
The double-sided pressure-sensitive adhesive tape, wherein the acrylic copolymer constituting the acrylic pressure-sensitive adhesive layer contains 40 to 80% by weight of butyl acrylate as a copolymer component .
前記ポリオレフィン発泡体からなる基材は、ＭＤ方向及びＴＤ方向における平均セル径がそれぞれ８０μｍ未満、発泡倍率が１．４〜２．２倍であり、The base material made of the polyolefin foam has an average cell diameter in the MD direction and the TD direction of less than 80 μm and an expansion ratio of 1.4 to 2.2 times, respectively.
前記アクリル粘着剤層は、動的粘弾性測定から求められるガラス転移温度Ｔｇが５〜１８℃、２３℃における貯蔵弾性率Ｇ’が２×１０The acrylic pressure-sensitive adhesive layer has a glass transition temperature Tg of 5 to 18 ° C. and a storage elastic modulus G ′ of 2 × 10 ° C. determined at 23 ° C., which are determined by dynamic viscoelasticity measurement ５5 〜９×１０~ 9 x 10 ５5 Ｐａであり、Pa,
前記アクリル粘着剤層を構成するアクリル共重合体は、共重合成分として２−エチルヘキシルアクリレートを１０〜４０重量％含むThe acrylic copolymer constituting the acrylic pressure-sensitive adhesive layer contains 10 to 40% by weight of 2-ethylhexyl acrylate as a copolymer component
ことを特徴とする両面粘着テープ。Double-sided adhesive tape characterized by
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| TWI793330B (en) * | 2018-06-11 | 2023-02-21 | 日商Ｄｉｃ股份有限公司 | double sided adhesive tape |
| JP7265379B2 (en) * | 2019-03-06 | 2023-04-26 | 積水化学工業株式会社 | Laminates and adhesive tapes |
| WO2020246351A1 (en) * | 2019-06-04 | 2020-12-10 | Dic株式会社 | Double-sided adhesive tape and electronic device |
| JP7698971B2 (en) * | 2020-04-22 | 2025-06-26 | 日東電工株式会社 | Double-sided adhesive tape |
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| JP2007328092A (en) * | 2006-06-07 | 2007-12-20 | Bridgestone Corp | Optical filter, and display and plasma display panel equipped with the same |
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