JP6058016B2 - Double-sided adhesive tape - Google Patents
Double-sided adhesive tape Download PDFInfo
- Publication number
- JP6058016B2 JP6058016B2 JP2014537417A JP2014537417A JP6058016B2 JP 6058016 B2 JP6058016 B2 JP 6058016B2 JP 2014537417 A JP2014537417 A JP 2014537417A JP 2014537417 A JP2014537417 A JP 2014537417A JP 6058016 B2 JP6058016 B2 JP 6058016B2
- Authority
- JP
- Japan
- Prior art keywords
- sensitive adhesive
- pressure
- mass
- adhesive tape
- double
- 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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- 239000002390 adhesive tape Substances 0.000 title claims description 32
- 239000006260 foam Substances 0.000 claims description 181
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 177
- 239000000463 material Substances 0.000 claims description 116
- 239000010410 layer Substances 0.000 claims description 81
- 239000000203 mixture Substances 0.000 claims description 67
- -1 polyethylene terephthalate Polymers 0.000 claims description 48
- 239000000758 substrate Substances 0.000 claims description 44
- 229920005989 resin Polymers 0.000 claims description 42
- 239000011347 resin Substances 0.000 claims description 42
- 229920000058 polyacrylate Polymers 0.000 claims description 30
- 229920000098 polyolefin Polymers 0.000 claims description 30
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 26
- 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 claims description 26
- 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 claims description 26
- 239000003431 cross linking reagent Substances 0.000 claims description 23
- 239000011229 interlayer Substances 0.000 claims description 18
- 239000012790 adhesive layer Substances 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 150000002148 esters Chemical class 0.000 claims description 9
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 8
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 8
- 239000003208 petroleum Substances 0.000 claims description 7
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- 230000032683 aging Effects 0.000 claims description 5
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 63
- 238000000034 method Methods 0.000 description 45
- 239000000853 adhesive Substances 0.000 description 32
- 230000001070 adhesive effect Effects 0.000 description 32
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- 238000012360 testing method Methods 0.000 description 25
- 238000005187 foaming Methods 0.000 description 22
- 239000000178 monomer Substances 0.000 description 19
- 239000000126 substance Substances 0.000 description 16
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 15
- 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 14
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- 210000004027 cell Anatomy 0.000 description 11
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 9
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 7
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- 229920002799 BoPET Polymers 0.000 description 6
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- 239000004743 Polypropylene Substances 0.000 description 6
- 238000003851 corona treatment Methods 0.000 description 6
- 239000004088 foaming agent Substances 0.000 description 6
- 235000011187 glycerol Nutrition 0.000 description 6
- 229920001155 polypropylene Polymers 0.000 description 6
- 238000004804 winding Methods 0.000 description 6
- 239000005977 Ethylene Substances 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 125000000217 alkyl group Chemical group 0.000 description 5
- 239000003999 initiator Substances 0.000 description 5
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- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 4
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 4
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
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- 238000010030 laminating Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
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- 239000002245 particle Substances 0.000 description 4
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 4
- 239000011342 resin composition Substances 0.000 description 4
- 239000011787 zinc oxide Substances 0.000 description 4
- 235000014692 zinc oxide Nutrition 0.000 description 4
- NDWUBGAGUCISDV-UHFFFAOYSA-N 4-hydroxybutyl prop-2-enoate Chemical group OCCCCOC(=O)C=C NDWUBGAGUCISDV-UHFFFAOYSA-N 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 3
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 3
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- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 3
- 239000000123 paper Substances 0.000 description 3
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
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- 230000001681 protective effect Effects 0.000 description 3
- 150000003505 terpenes Chemical class 0.000 description 3
- 235000007586 terpenes Nutrition 0.000 description 3
- 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 3
- 229910052723 transition metal Inorganic materials 0.000 description 3
- 150000003624 transition metals Chemical class 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 2
- SXIFAEWFOJETOA-UHFFFAOYSA-N 4-hydroxy-butyl Chemical group [CH2]CCCO SXIFAEWFOJETOA-UHFFFAOYSA-N 0.000 description 2
- KWOLFJPFCHCOCG-UHFFFAOYSA-N Acetophenone Chemical compound CC(=O)C1=CC=CC=C1 KWOLFJPFCHCOCG-UHFFFAOYSA-N 0.000 description 2
- 239000004156 Azodicarbonamide Substances 0.000 description 2
- 239000004342 Benzoyl peroxide Substances 0.000 description 2
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
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- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 125000003368 amide group Chemical group 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 2
- 235000019399 azodicarbonamide Nutrition 0.000 description 2
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 description 2
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- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 2
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- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
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- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000012939 laminating adhesive Substances 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 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
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- 150000002736 metal compounds Chemical class 0.000 description 1
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- 150000002739 metals Chemical class 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
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- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
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- 150000002978 peroxides Chemical class 0.000 description 1
- 125000002080 perylenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC5=CC=CC(C1=C23)=C45)* 0.000 description 1
- CSHWQDPOILHKBI-UHFFFAOYSA-N peryrene Natural products C1=CC(C2=CC=CC=3C2=C2C=CC=3)=C3C2=CC=CC3=C1 CSHWQDPOILHKBI-UHFFFAOYSA-N 0.000 description 1
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- 239000000454 talc Substances 0.000 description 1
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- 238000009864 tensile test Methods 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
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- 239000002562 thickening agent Substances 0.000 description 1
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- JUWGUJSXVOBPHP-UHFFFAOYSA-B titanium(4+);tetraphosphate Chemical compound [Ti+4].[Ti+4].[Ti+4].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O JUWGUJSXVOBPHP-UHFFFAOYSA-B 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-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
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- 239000011667 zinc carbonate Substances 0.000 description 1
- 235000004416 zinc carbonate Nutrition 0.000 description 1
- 229910000010 zinc carbonate Inorganic materials 0.000 description 1
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/26—Porous or cellular plastics
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Adhesive Tapes (AREA)
- Laminated Bodies (AREA)
- Adhesives Or Adhesive Processes (AREA)
Description
本発明は、電子機器をはじめとする様々な部材の固定に使用可能な両面粘着テープに関する。 The present invention relates to a double-sided pressure-sensitive adhesive tape that can be used for fixing various members including electronic devices.
両面粘着テープは、例えば様々な電子機器の部材の固定に使用されている。具体的には、両面粘着テープは、携帯電話、カメラ、パソコンなどの小型電子機器を構成する画像表示部の保護パネルと筐体との固定や、外装部品、電池、各種部材モジュール等の剛体部品同士を固定する際に使用されることが多い。 The double-sided pressure-sensitive adhesive tape is used for fixing members of various electronic devices, for example. Specifically, the double-sided adhesive tape is a rigid part such as fixing the protective panel of the image display unit and the casing constituting a small electronic device such as a mobile phone, a camera, a personal computer, an exterior part, a battery, and various member modules. Often used to fix each other.
前記小型電子機器等の部品の固定に好適に使用可能な両面粘着テープとしては、薄型で良好な追従性を有するものを好適に使用することができ、例えば、柔軟な発泡体を基材として使用した両面粘着テープが知られている(例えば、特許文献1または2参照。)。 As a double-sided pressure-sensitive adhesive tape that can be suitably used for fixing components such as small electronic devices, a thin and good followable tape can be suitably used. For example, a flexible foam is used as a base material. A double-sided pressure-sensitive adhesive tape is known (for example, see Patent Document 1 or 2).
一方、前記小型電子機器は、携帯して使用される機会が多く、それを落下させた際の衝撃により両面粘着テープが剥離し部品の欠落を引き起こす場合がある。そのため、前記両面粘着テープには、前記落下の衝撃に耐えうるレベルの耐衝撃性が求められている。 On the other hand, the small electronic device has many opportunities to be carried and used, and the double-sided pressure-sensitive adhesive tape may be peeled off due to an impact when the small electronic device is dropped. Therefore, the double-sided pressure-sensitive adhesive tape is required to have a level of impact resistance that can withstand the impact of the drop.
また、高機能化が進む携帯電子機器には、例えば画像表示部の保護パネルや画像表示モジュール、薄型電池等の薄型の板状剛体などの高価な部品が多く使用されている。そのため、前記電子機器の不具合などが生じた際に、前記部品を電子機器から比較的容易に効率よく分離可能なレベルの解体性を有することが粘着テープに求められている。 In addition, expensive electronic parts such as a protective panel for an image display unit, an image display module, and a thin plate-like rigid body such as a thin battery are often used in portable electronic devices that have advanced functions. For this reason, the adhesive tape is required to have a level of disassembly that allows the components to be separated from the electronic device relatively easily and efficiently when a failure of the electronic device occurs.
本発明が解決しようとする課題は、好適な耐衝撃性を有すると共に、一定の力が加わった際に容易に解体することができる両面粘着テープを提供することである。 The problem to be solved by the present invention is to provide a double-sided pressure-sensitive adhesive tape that has suitable impact resistance and can be easily disassembled when a certain force is applied.
本発明は、発泡体基材の両面に粘着剤層を有する両面粘着テープであって、前記発泡体基材が、密度0.45g/cm3以下、層間強度10N/cm以上の発泡体基材であり、前記粘着剤層が、厚さ25μmのポリエチレンテレフタレート基材に厚さ25μmの粘着剤層を設けて形成した粘着テープを、温度23℃及び相対湿度65%RHの環境下でアルミニウム板に、2kgローラーを使用し一往復させることで圧着させ、温度23℃及び相対湿度50%RHの環境下に1時間静置した後に測定される剥離速度300mm/minにおける180°引き剥がし接着力が12N/20mm以上の粘着剤層であることを特徴とする両面粘着テープにより、上記課題を解決する。The present invention is a double-sided pressure-sensitive adhesive tape having pressure-sensitive adhesive layers on both sides of a foam base material, the foam base material having a density of 0.45 g / cm 3 or less and an interlayer strength of 10 N / cm or more. The pressure-sensitive adhesive layer is a 25 μm-thick polyethylene terephthalate base material provided with a 25 μm-thick pressure-sensitive adhesive layer on an aluminum plate in an environment of a temperature of 23 ° C. and a relative humidity of 65% RH. The adhesive force is 12N when peeled by 180 ° at a peeling speed of 300 mm / min measured after being pressed for one hour using a 2 kg roller and allowed to stand in an environment of a temperature of 23 ° C. and a relative humidity of 50% RH for 1 hour. The above-mentioned problem is solved by a double-sided pressure-sensitive adhesive tape characterized by being a pressure-sensitive adhesive layer of / 20 mm or more.
本発明の両面粘着テープは、上記構成により、好適な耐衝撃性を有すると共に、一定の力が加わった際には発泡体基材が層間割れを生じて容易に解体することが可能である。このため、本発明の両面粘着テープが用いられた電子機器に落下等の衝撃が加わった際にも部品の脱離が生じにくく、また、一定の力で解体できることから、解体時に固定された部品の割れや歪みを抑制することができる。また、前記電子機器等の製造不良品やリサイクル品から特定の部品を解体する際にも効率よく解体することができる。前記したような本発明の両面粘着テープは、例えば小型電子機器の部品固定用途、特に小型電子機器の情報表示部の保護パネルや画像表示モジュール、薄型電池等の薄型の板状剛体部品の固定用途に好適に適用できる。 With the above configuration, the double-sided pressure-sensitive adhesive tape of the present invention has a suitable impact resistance, and when a certain force is applied, the foam base material can be easily disassembled by causing an interlaminar crack. For this reason, when an impact such as dropping is applied to an electronic device using the double-sided pressure-sensitive adhesive tape of the present invention, the component is not easily detached, and can be disassembled with a constant force. Can suppress cracking and distortion. In addition, when a specific part is dismantled from a defective product such as the electronic device or a recycled product, it can be disassembled efficiently. The double-sided pressure-sensitive adhesive tape of the present invention as described above is used, for example, for fixing parts of small electronic devices, particularly for fixing thin plate-like rigid parts such as protective panels and image display modules for thin electronic devices and image display modules. It can be suitably applied to.
本発明の両面粘着テープは、発泡体基材の両面に粘着剤層を有する両面粘着テープであって、前記発泡体基材が、密度0.45g/cm3以下、層間強度10N/cm以上の発泡体基材であり、前記粘着剤層が、厚さ25μmのポリエチレンテレフタレート基材に厚さ25μmの粘着剤層を設けて形成した粘着テープを、温度23℃及び相対湿度65%RHの環境下でアルミニウム板に、2kgローラーを使用し一往復させることで圧着させ、温度23℃及び相対湿度50%RHの環境下に1時間静置した後に測定される剥離速度300mm/minにおける180°引き剥がし接着力が12N/20mm以上の粘着剤層であることを特徴とするものである。The double-sided pressure-sensitive adhesive tape of the present invention is a double-sided pressure-sensitive adhesive tape having pressure-sensitive adhesive layers on both sides of a foam substrate, and the foam substrate has a density of 0.45 g / cm 3 or less and an interlayer strength of 10 N / cm or more. A pressure-sensitive adhesive tape, which is a foam base material and is formed by providing a 25 μm thick adhesive layer on a 25 μm thick polyethylene terephthalate base material, in an environment at a temperature of 23 ° C. and a relative humidity of 65% RH With a 2 kg roller, the aluminum plate is crimped by reciprocating once, and then 180 ° peeling at a peeling speed of 300 mm / min measured after standing for 1 hour in an environment of a temperature of 23 ° C. and a relative humidity of 50% RH. It is an adhesive layer having an adhesive strength of 12 N / 20 mm or more.
[発泡体基材]
本発明に使用する発泡体基材としては、密度が0.45g/cm3以下、好ましくは0.1g/cm3〜0.45g/cm3、より好ましくは0.15g/cm3〜0.42g/cm3であるものを使用することができる。前記範囲の密度を有する発泡体基材を使用することによって、一定の力が加わった際の好適な解体性を備えた両面粘着テープを得ることができる。[Foam substrate]
The foam substrate for use in the present invention, density of 0.45 g / cm 3 or less, preferably 0.1g / cm 3 ~0.45g / cm 3 , more preferably 0.15g / cm 3 ~0. What is 42 g / cm 3 can be used. By using a foam substrate having a density in the above range, it is possible to obtain a double-sided pressure-sensitive adhesive tape having suitable dismantling properties when a certain force is applied.
また、本発明で使用する発泡体基材としては、その層間強度が10N/cm以上、好ましくは10N/cm〜50N/cm、より好ましくは10N/cm〜25N/cmであるものを使用することができる。前記範囲の層間強度を備えた発泡体基材を使用することによって、好適な解体性と、好適な耐衝撃性とを両立でき、かつ、解体後に部品などの被着体の表面に残存した糊などの残存物を容易に剥離することが可能となる。 In addition, as the foam base material used in the present invention, one having an interlayer strength of 10 N / cm or more, preferably 10 N / cm to 50 N / cm, more preferably 10 N / cm to 25 N / cm is used. Can do. By using a foam base material having an interlayer strength in the above range, it is possible to achieve both suitable dismantling properties and suitable impact resistance, and the paste remaining on the surface of the adherend such as parts after dismantling It becomes possible to easily peel off the remaining materials such as.
上記層間強度は、以下の方法により測定することができる。 The interlayer strength can be measured by the following method.
発泡体基材の両面に、厚さ50μmの強粘着性の粘着剤層(下記高速剥離試験によって被着体及び発泡体基材から剥離しないレベルの粘着性を備えた粘着剤層)を1枚ずつ貼り合わせたのち、40℃で48時間熟成することによって、層間強度測定用の両面粘着テープを作成する。 One sheet of strong adhesive layer with a thickness of 50 μm (adhesive layer with a level of adhesive that does not peel from the adherend and foam substrate by the following high-speed peel test) on both surfaces of the foam substrate After laminating each one, aging at 40 ° C. for 48 hours creates a double-sided pressure-sensitive adhesive tape for measuring interlayer strength.
次に、前記層間強度測定用の両面粘着テープの片側の粘着剤層表面を、厚さ25μmのポリエステルフィルムで裏打ちし、発泡体基材の幅方向1cm及びその流れ方向15cmの大きさに裁断したものを、温度23℃及び相対湿度50%RH下、厚さ50μm、幅3cm、長さ20cmのポリエステルフィルムに貼付し、その表面を、2kgローラーを1往復させることで、それらを圧着した後、60℃の環境下に24時間静置し、次いで23℃で1時間静置することによって試験片を得る。 Next, the pressure-sensitive adhesive layer surface on one side of the double-sided pressure-sensitive adhesive tape for measuring the interlayer strength was lined with a polyester film having a thickness of 25 μm, and cut into a size of 1 cm in the width direction of the foam substrate and 15 cm in the flow direction. After sticking them to a polyester film having a thickness of 50 μm, a width of 3 cm, and a length of 20 cm under a temperature of 23 ° C. and a relative humidity of 50% RH, the surface was crimped by reciprocating a 2 kg roller, A test piece is obtained by leaving still at 60 degreeC environment for 24 hours, and then leaving still at 23 degreeC for 1 hour.
次に、温度23℃及び相対湿度50%RH下、前記試験片を構成する厚さ50μmmのポリエステルフィルム側を高速剥離試験機の取り付け治具に固定し、前記試験片を構成する厚さ25μmのポリエステルフィルムを引張速度15m/分で90度方向に引っ張ることで、前記試験片を構成する発泡体基材が引き裂かれた際の最大強度を測定する。 Next, at a temperature of 23 ° C. and a relative humidity of 50% RH, the 50 μm thick polyester film side constituting the test piece is fixed to a mounting jig of a high-speed peel tester, and the test piece is constituted by a 25 μm thick By pulling the polyester film in the direction of 90 degrees at a tensile speed of 15 m / min, the maximum strength when the foam substrate constituting the test piece is torn is measured.
前記発泡体基材としては、25%圧縮強度が500kPa以下であるものを使用することが好ましく、10kPa〜300kPaであるものを使用することがより好ましく、10kPa〜200kPaであるものを使用することがより好ましく、30kPa〜180kPaであるものを使用することがさらに好ましく、50kPa〜150kPaであるものを使用することが特に好ましい。前記範囲の25%圧縮強度を有する発泡体基材を使用することによって、好適な耐衝撃性と解体性とを両立でき、かつ、被着体に対する好適な追従性を備えた両面粘着テープを得ることができる。 As the foam base material, it is preferable to use one having a 25% compressive strength of 500 kPa or less, more preferably one having 10 kPa to 300 kPa, and one having 10 kPa to 200 kPa. More preferably, those having 30 kPa to 180 kPa are more preferably used, and those having 50 kPa to 150 kPa are particularly preferable. By using a foam base material having a compressive strength of 25% within the above range, a double-sided pressure-sensitive adhesive tape having both suitable impact resistance and dismantling properties and suitable followability to an adherend is obtained. be able to.
なお、前記25%圧縮強度は、JISK6767に準じて測定することができる。具体的には、25角に切断した前記両面粘着テープ試料を厚さ約10mmになるまで重ね合わせる。前記両面粘着テープ試料より大きな面積のステンレス板で前記両面粘着テープ試料の積層体をはさみ、23℃下で10mm/分の速度で前記試料の積層体を約2.5mm(もとの厚さの25%分)圧縮した時の強度を測定する。 The 25% compressive strength can be measured according to JISK6767. Specifically, the double-sided pressure-sensitive adhesive tape sample cut into 25 corners is overlaid until the thickness is about 10 mm. The laminate of the double-sided adhesive tape sample is sandwiched between stainless steel plates having a larger area than the double-sided adhesive tape sample, and the laminate of the sample is about 2.5 mm (of the original thickness) at a speed of 10 mm / min at 23 ° C. 25%) Measure the strength when compressed.
前記発泡体基材としては、その流れ方向と幅方向の引張強さを特に限定するものではないが、500N/cm2〜1300N/cm2である引張強さを有するものを使用することが好ましく、600N/cm2〜1200N/cm2である引張強さを有するものを使用することがより好ましい。As the foam substrate is not particularly limited tensile strength of the flow direction and the width direction, it is preferable to use those having a tensile strength is 500N / cm 2 ~1300N /
なお、前述の発泡体基材の流れ方向と幅方向の引張強さは、JISK6767に準じて測定することができる。具体的には、標線長さ2cm及び幅1cmの大きさに裁断した前記両面粘着テープ試料を、テンシロン引張試験機を用い、23℃及び50%RHの環境下において、引張速度300mm/minの測定条件で測定した最大強度である。 In addition, the tensile strength of the flow direction of the above-mentioned foam base material and the width direction can be measured according to JISK6767. Specifically, the double-sided pressure-sensitive adhesive tape sample cut to a size of a marked line length of 2 cm and a width of 1 cm was used at a tensile speed of 300 mm / min in a 23 ° C. and 50% RH environment using a Tensilon tensile tester. It is the maximum intensity measured under the measurement conditions.
また、前記発泡体基材としては、前記引張試験によって測定される前記発泡体基材の切断時の引張伸度を特に限定するものではないが、流れ方向の引張伸度が100%〜1200%であるものを使用することが好ましく、100%〜1000%であるものを使用することがより好ましく、200%〜600%であるものを使用することがさらに好ましい。 Further, the foam base material is not particularly limited in tensile elongation at the time of cutting the foam base material measured by the tensile test, but the tensile elongation in the flow direction is 100% to 1200%. It is preferable to use those that are 100% to 1000%, more preferably 200% to 600%.
前記範囲の引張強さ及び引張伸度を有する発泡体基材を使用することによって、良好な加工性や貼付作業性を備え、かつ、より一層良好な解体性を備えた両面粘着テープを得ることができる。 By using a foam base material having a tensile strength and a tensile elongation in the above ranges, a double-sided pressure-sensitive adhesive tape having good workability and sticking workability, and having even better dismantling properties is obtained. Can do.
前記発泡体基材の流れ方向および幅方向の平均気泡径は、特に制限されないが、10μm〜500μmの範囲であることが好ましく、30μm〜400μmの範囲であることがより好ましく、50μm〜300μmの範囲であることがさらに好ましい。流れ方向および幅方向の平均気泡径が前記範囲の発泡体基材を使用することによって、被着体との密着性により一層優れ、かつ、耐衝撃性により一層優れた両面粘着テープを得ることができる。 The average cell diameter in the flow direction and the width direction of the foam substrate is not particularly limited, but is preferably in the range of 10 μm to 500 μm, more preferably in the range of 30 μm to 400 μm, and in the range of 50 μm to 300 μm. More preferably. By using a foam substrate having an average cell diameter in the flow direction and width direction within the above range, it is possible to obtain a double-sided pressure-sensitive adhesive tape that is more excellent in adhesion to an adherend and more excellent in impact resistance. it can.
前記発泡体基材の流れ方向と幅方向の平均気泡径の比(流れ方向における平均気泡径/幅方向における平均気泡径)は、特に限定されないが、0.2〜4の範囲であることが好ましく、0.3〜3の範囲であることがより好ましく、0.4〜1の範囲であることがさらに好ましい。前記範囲の比を備えた発泡体基材を使用することによって、流れ方向と幅方向の柔軟性や引張強さのばらつきの抑制された両面粘着テープを得ることができる。 The ratio of the average bubble diameter in the flow direction and the width direction of the foam base material (average bubble diameter in the flow direction / average bubble diameter in the width direction) is not particularly limited, but may be in the range of 0.2 to 4. Preferably, it is in the range of 0.3 to 3, more preferably in the range of 0.4 to 1. By using a foam base material having a ratio in the above range, it is possible to obtain a double-sided pressure-sensitive adhesive tape in which variations in flexibility and tensile strength in the flow direction and width direction are suppressed.
前記発泡体基材の厚さ方向の平均気泡径は、3μm〜100μmであることが好ましく、5μm〜80μmであることがより好ましく、5μm〜50μmであることがさらに好ましい。また、前記厚さ方向の平均気泡径は、発泡体基材の厚さの1/2以下であることが好ましく、1/3以下であることが好ましい。前記範囲の厚さ方向の平均気泡径を有する発泡体基材を使用することによって、発泡体基材の密度及び引張強さを好適な範囲に調整することができ、その結果、より一層優れた解体性及び耐衝撃性と、被着体として剛体を用いた場合であっても、より一層優れた密着性を備えた両面粘着テープを得ることができる。 The average cell diameter in the thickness direction of the foam substrate is preferably 3 μm to 100 μm, more preferably 5 μm to 80 μm, and even more preferably 5 μm to 50 μm. The average cell diameter in the thickness direction is preferably 1/2 or less, and preferably 1/3 or less of the thickness of the foam base material. By using a foam base material having an average cell diameter in the thickness direction within the above range, the density and tensile strength of the foam base material can be adjusted to a suitable range, and as a result, even better. Even when the disassembly and impact resistance and a rigid body is used as the adherend, a double-sided pressure-sensitive adhesive tape with even better adhesion can be obtained.
前記発泡体基材としては、その厚さ方向の平均気泡径に対する、その流れ方向の平均気泡径の比(流れ方向の平均気泡径/厚さ方向の平均気泡径)、及び、その厚さ方向の平均気泡径に対する、その幅方向の平均気泡径の比(幅方向の平均気泡径/厚さ方向の平均気泡径)が、いずれも1以上であるものを使用することが好ましく、3以上であるものを使用することがより好ましく、4〜25であるものを使用することがさらに好ましい。 As the foam substrate, the ratio of the average bubble diameter in the flow direction to the average bubble diameter in the thickness direction (average bubble diameter in the flow direction / average bubble diameter in the thickness direction), and the thickness direction It is preferable to use those in which the ratio of the average bubble diameter in the width direction to the average bubble diameter (average bubble diameter in the width direction / average bubble diameter in the thickness direction) is 1 or more. It is more preferable to use a certain thing, and it is still more preferable to use what is 4-25.
前記平均気泡径の比を備えた発泡体基材を使用することによって、厚さ方向の柔軟性に優れ、かつ、被着体として剛体を用いた場合であっても、より一層優れた密着性を備えた両面粘着テープを得ることが得ることができる。 By using a foam base material having the ratio of the average cell diameter, it has excellent flexibility in the thickness direction, and even better adhesion even when a rigid body is used as the adherend. Can be obtained.
なお、前記発泡体基材の幅方向の平均気泡径、流れ方向のの平均気泡径、及び、厚さ方向の平均気泡径は、下記の要領で測定することができる。 The average bubble diameter in the width direction, the average bubble diameter in the flow direction, and the average bubble diameter in the thickness direction of the foam substrate can be measured in the following manner.
はじめに、発泡体基材を幅方法1cm及び流れ方向1cmの大きさに切断する。 First, a foam base material is cut | disconnected to the magnitude | size of the width method 1cm and the flow direction 1cm.
次に、デジタルマイクロスコープ(商品名「KH−7700」、HiROX社製)を倍率200倍に設定し、前記発泡体基材の幅方向または流れ方向の切断面を観察する。その際、前記発泡体基材の切断面の厚さ方向の全長を観察する。前記観察では、前記切断面の流れ方向または幅方向に2mmの範囲に存在する気泡の気泡径をすべて測定する。次に、前記2mmの範囲を変更し、任意の10か所の範囲に存在する気泡の気泡径をすべて測定する。 Next, a digital microscope (trade name “KH-7700”, manufactured by HiROX) is set to a magnification of 200 times, and a cut surface in the width direction or the flow direction of the foam substrate is observed. In that case, the full length of the thickness direction of the cut surface of the said foam base material is observed. In the observation, all the bubble diameters of the bubbles existing in the range of 2 mm in the flow direction or the width direction of the cut surface are measured. Next, the range of 2 mm is changed, and all the bubble diameters of bubbles existing in arbitrary 10 ranges are measured.
前記で測定した気泡径の平均値を算出することによって得られた値を、上記平均気泡径とした。 The value obtained by calculating the average value of the bubble diameters measured above was defined as the average bubble diameter.
前記発泡体基材としては、独立気泡構造を有するものを使用することが、発泡体基材の切断面からの浸水または粉じんを効果的に防ぐことができるため好ましい。前記独立気泡構造を形成する気泡の形状としては、その流れ方向または幅方向もしくはその両方向の平均気泡径が、その厚さ方向の平均気泡径よりも大きい形状であることが、被着体に対する適度な追従性とクッション性とを備えた両面粘着テープを得るうえで好ましい。 As the foam base material, it is preferable to use one having a closed cell structure because it is possible to effectively prevent water immersion or dust from the cut surface of the foam base material. As the shape of the bubbles forming the closed cell structure, the average bubble diameter in the flow direction or width direction or in both directions is larger than the average bubble diameter in the thickness direction. It is preferable for obtaining a double-sided pressure-sensitive adhesive tape having excellent followability and cushioning properties.
前記発泡体基材としては、その厚さが250μm以下であるものを使用することが好ましく、50μm〜250μmであるものを使用することがより好ましく、80μm〜200μmであるものを使用することがさらに好ましく、100μm〜150μmであるものを使用することが、薄型であってもより一層優れた耐衝撃性と解体性とを備えた両面粘着テープを得るうえで特に好ましい。 As the foam base material, it is preferable to use one having a thickness of 250 μm or less, more preferably from 50 μm to 250 μm, and even more preferably from 80 μm to 200 μm. It is particularly preferable to use one having a thickness of 100 μm to 150 μm in order to obtain a double-sided pressure-sensitive adhesive tape having even better impact resistance and dismantling properties even if it is thin.
発泡体基材の密度、層間強度、圧縮強度および引張強さなどは、使用する発泡体基材の素材や発泡構造により適宜調整することができる。 The density, interlayer strength, compressive strength, tensile strength, and the like of the foam base material can be appropriately adjusted depending on the material and foam structure of the foam base material to be used.
前記発泡体基材としては、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、エチレン−酢酸ビニル共重合体等からなるポリオレフィンを用いて得られるポリオレフィン系発泡体、ポリウレタン系発泡体、アクリル系発泡体、その他のゴム系発泡体等を使用することができる。 Examples of the foam base material include polyolefin-based foams, polyurethane-based foams, and acrylic-based foams obtained by using polyolefins such as polyethylene, polypropylene, ethylene-propylene copolymers, ethylene-vinyl acetate copolymers, and the like. Other rubber-based foams can be used.
前記発泡体基材としては、前記したなかでも、被着体の表面凹凸に好適に追従でき耐衝撃性に優れた独立気泡構造の発泡体基材を作製しやすいため、ポリオレフィン系発泡体を使用することが好ましい。 As the foam base material, among those described above, polyolefin foam is used because it is easy to produce a foam base material having a closed cell structure that can suitably follow the surface irregularities of the adherend and has excellent impact resistance. It is preferable to do.
前記ポリオレフィン系発泡体基材としては、ポリエチレン系樹脂を用いて得られた発泡体基材を使用することが、比較的均一な厚さで、かつ、より一層好適な柔軟性を備えるため好ましい。 As the polyolefin-based foam base material, it is preferable to use a foam base material obtained by using a polyethylene-based resin because it has a relatively uniform thickness and more suitable flexibility.
前記ポリオレフィン系樹脂に含まれる前記ポリエチレン系樹脂の含有量は、40質量%以上であることが好ましく、50質量%以上であることがより好ましく、60質量%以上であることが更に好ましく、100質量%であることが特に好ましい。 The content of the polyethylene resin contained in the polyolefin resin is preferably 40% by mass or more, more preferably 50% by mass or more, still more preferably 60% by mass or more, and 100% by mass. % Is particularly preferred.
また、前記ポリオレフィン系発泡体の製造に使用可能なポリエチレン系樹脂としては、例えば直鎖状低密度ポリエチレン、低密度ポリエチレン、中密度ポリエチレン、高密度ポリエチレン、エチレンを50質量%以上含有するエチレン−α−オレフィン共重合体、エチレンを50質量%以上含有するエチレン−酢酸ビニル共重合体等を、単独で使用または二種以上併用することができる。 Examples of the polyethylene resin that can be used in the production of the polyolefin foam include linear low density polyethylene, low density polyethylene, medium density polyethylene, high density polyethylene, and ethylene-α containing 50% by mass or more of ethylene. An olefin copolymer, an ethylene-vinyl acetate copolymer containing 50% by mass or more of ethylene can be used alone or in combination of two or more.
前記エチレン−α−オレフィン共重合体を構成するα−オレフィンとしては、例えば、プロピレン、1−ブテン、1−ペンテン、4−メチル−1−ペンテン、1−ヘキセン、1−ヘプテン、1−オクテンなどが挙げられる。 Examples of the α-olefin constituting the ethylene-α-olefin copolymer include propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene and the like. Is mentioned.
前記ポリプロピレン系樹脂としては、特には限定されず、例えば、ポリプロピレン、プロピレンを50質量%以上含有するプロピレン−α−オレフィン共重合体などが挙げられ、これらは単独で使用されても二種以上が併用されてもよい。プロピレン−α−オレフィン共重合体を構成するα−オレフィンとしては、例えば、エチレン、1−ブテン、1−ペンテン、4−メチル−1−ペンテン、1−ヘキセン、1−ヘプテン、1−オクテンなどが挙げられる。 The polypropylene resin is not particularly limited, and examples thereof include polypropylene, a propylene-α-olefin copolymer containing 50% by mass or more of propylene, and these may be used alone or in combination of two or more. You may use together. Examples of the α-olefin constituting the propylene-α-olefin copolymer include ethylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene and 1-octene. Can be mentioned.
前記ポリエチレン系樹脂としては、前記したなかでも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る分子量分布の狭いポリエチレン系樹脂を使用することが好ましい。また、前記方法で得られるポリエチレン系樹脂は、いずれの分子量を有するポリエチレン系樹脂であっても、その共重合成分の共重合割合をほぼ等しく調整することができ、その結果、ほぼ均一に架橋されたポリオレフィン系発泡体を得ることができる。前記ほぼ均一に架橋されたポリオレフィン系発泡体は、延伸させやすく、また、その厚さを全体的に均一なものとしやすい。 As the polyethylene resin, it is preferable to use a polyethylene resin having a narrow molecular weight distribution obtained by using a metallocene compound containing a tetravalent transition metal as a polymerization catalyst. In addition, the polyethylene resin obtained by the above method can adjust the copolymerization ratio of the copolymerization component to be almost equal even if it is a polyethylene resin having any molecular weight. A polyolefin foam can be obtained. The substantially uniformly crosslinked polyolefin-based foam can be easily stretched, and the thickness thereof can be easily uniformed as a whole.
前記ポリエチレン系樹脂としては、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もの以外の、他の製造方法で得られたポリオレフィン系樹脂を使用してもよい。 As said polyethylene resin, you may use the polyolefin resin obtained by other manufacturing methods other than what was obtained using the metallocene compound containing a tetravalent transition metal.
前記ポリオレフィン系発泡体基材は、架橋構造を有していてもよい。ポリオレフィン系樹脂シートを熱分解型発泡剤などで発泡させることによってポリオレフィン系発泡体を製造する場合は、前記架橋構造を形成すべく設計することが好ましい。架橋度は5質量%〜60質量%の範囲であることが好ましく、10質量%〜55質量%の範囲であることが、粘着剤層との良好な密着性と、耐衝撃性とをより一層向上するうえでより好ましい。 The polyolefin-based foam base material may have a crosslinked structure. When producing a polyolefin-based foam by foaming a polyolefin-based resin sheet with a pyrolytic foaming agent or the like, it is preferable to design to form the crosslinked structure. The degree of crosslinking is preferably in the range of 5% by mass to 60% by mass, and more preferably in the range of 10% by mass to 55% by mass to achieve better adhesion to the pressure-sensitive adhesive layer and impact resistance. It is more preferable in improving.
前記架橋度の測定は以下の方法で行うことができる。40mm×50mm角の発泡体基材5枚一組を試料とし、その合計質量(G1)を測定する。次に、試料をキシレン中に120℃で24時間浸漬した後、キシレン不溶解分を300メッシュ金網で濾過することにより分離し、110℃で1時間乾燥した後の残渣の質量(G2)を測定する。以下の式に従って求めるキシレン不溶分を架橋度とする。 The degree of crosslinking can be measured by the following method. A set of five 40 mm × 50 mm square foam base materials is used as a sample, and the total mass (G1) is measured. Next, after immersing the sample in xylene at 120 ° C. for 24 hours, the xylene-insoluble matter was separated by filtration through a 300 mesh wire net, and the residue mass (G2) after drying at 110 ° C. for 1 hour was measured. To do. The xylene-insoluble content determined according to the following formula is defined as the degree of crosslinking.
架橋度(質量%)=(G2/G1)×100 Crosslinking degree (mass%) = (G2 / G1) × 100
前記ポリオレフィン系発泡体の製造方法としては、特に限定されず、例えば、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エチレン系樹脂を40重量%以上含有するポリオレフィン系樹脂及び熱分解型発泡剤と発泡助剤、発泡体を黒色や白色などに着色するための着色剤等を含有するポリオレフィン系樹脂組成物を押出機に供給して溶融混練し、押出機からシート状に押出すことによってポリオレフィン系樹脂シートを製造する工程と、前記ポリオレフィン系樹脂シートを架橋させる工程と、前記ポリオレフィン系樹脂シートを発泡させる工程と、得られた発泡シートを溶融又は軟化させ、流れ方向もしくは幅方向の何れか一方又は双方の方向に向かって延伸させて発泡シートを延伸する工程を含有する方法が挙げられる。なお、発泡シートを延伸する工程は必要に応じて行われればよく、複数回行われてもよい。 The method for producing the polyolefin foam is not particularly limited. For example, a polyolefin resin containing 40% by weight or more of a polyethylene resin obtained by using a metallocene compound containing a tetravalent transition metal as a polymerization catalyst, and A polyolefin-based resin composition containing a pyrolytic foaming agent, a foaming aid, and a colorant for coloring the foam in black or white is supplied to an extruder and melt-kneaded. From the extruder into a sheet form A step of producing a polyolefin-based resin sheet by extruding, a step of crosslinking the polyolefin-based resin sheet, a step of foaming the polyolefin-based resin sheet, and melting or softening the obtained foamed sheet, A method comprising a step of stretching a foam sheet by stretching in either or both of the width directions And the like. In addition, the process of extending | stretching a foam sheet should just be performed as needed, and may be performed in multiple times.
前記熱分解型発泡剤としては、従来から発泡体の製造に用いられているものであれば特に限定されず、例えば、アゾジカルボンアミド、N,N‘−ジニトロソペンタメチレンテトラミン、p−トルエンスルホニルセミカルバジドなどが挙げられ、中でもアゾジカルボンアミドが好ましい。なお、熱分解型発泡剤は単独でも二種類以上が併用されていてもよい。 The pyrolytic foaming agent is not particularly limited as long as it is conventionally used in the production of foams. For example, azodicarbonamide, N, N′-dinitrosopentamethylenetetramine, p-toluenesulfonyl Semicarbazide and the like can be mentioned, and among them, azodicarbonamide is preferable. In addition, a thermal decomposition type foaming agent may be individual, or 2 or more types may be used together.
前記熱分解型発泡剤の添加量は、ポリオレフィン系発泡体の発泡倍率に応じて適宜決定してよいが、ポリオレフィン系樹脂100質量部に対して1質量部〜40質量部であることが好ましく、1質量部〜30質量部であることが、発泡倍率、引張強さ、圧縮回復率などを所望の範囲に調整しやすいためより好ましい。 The amount of the pyrolytic foaming agent added may be appropriately determined according to the expansion ratio of the polyolefin foam, but is preferably 1 part by mass to 40 parts by mass with respect to 100 parts by mass of the polyolefin resin. It is more preferable that the amount is 1 part by mass to 30 parts by mass because the expansion ratio, tensile strength, compression recovery rate, and the like can be easily adjusted to a desired range.
ポリオレフィン系発泡体基材を架橋させる方法としては、例えば、ポリオレフィン系発泡体基材に電離性放射線を照射する方法、ポリオレフィン系樹脂組成物に予め有機過酸化物を配合しておき、得られたポリオレフィン系発泡体基材を加熱して有機過酸化物を分解させる方法などが挙げられ、これらの方法は併用されてもよい。 As a method of crosslinking the polyolefin foam substrate, for example, a method of irradiating the polyolefin foam substrate with ionizing radiation, an organic peroxide was previously blended in the polyolefin resin composition, and obtained. The method of heating a polyolefin-type foam base material and decomposing | disassembling an organic peroxide etc. is mentioned, These methods may be used together.
電離性放射線としては、電子線、α線、β線、γ線などが挙げられる。電離性放射線の線量は、ポリオレフィン系発泡体基材の架橋度が前記の好ましい範囲になるように適宜調整できるが、5kGy〜200kGyの範囲であることが好ましい。また、電離性放射線の照射は、均一な発泡状態を得やすいことから、ポリオレフィン系発泡体基材の両面に照射するのが好ましく、両面に照射する線量を同じにするのがより好ましい。 Examples of ionizing radiation include electron beams, α rays, β rays, and γ rays. The dose of ionizing radiation can be appropriately adjusted so that the cross-linking degree of the polyolefin-based foam substrate is within the above-mentioned preferable range, but is preferably in the range of 5 kGy to 200 kGy. Moreover, since it is easy to obtain a uniform foamed state, it is preferable to irradiate both surfaces of the polyolefin-based foam base material, and it is more preferable that the radiation dose to both surfaces be the same.
有機過酸化物としては、例えば、1,1−ビス(t−ブチルパーオキシ)3,3,5−トリメチルシクロヘキサン、1,1−ビス(t−ブチルパーオキシ)シクロヘキサン、2,2−ビス(t−ブチルパーオキシ)オクタン、n−ブチル−4,4−ビス(t−ブチルパーオキシ)バレレート、ジ−t−ブチルパーオキサイド、t−ブチルクミルパーオキサイド、ジクミルパーオキサイド、α,α’−ビス(t−ブチルパーオキシ−m−イソプロピル)ベンゼン、2,5−ジメチル−2,5−ジ(t−ブチルパーオキシ)ヘキサン、2,5−ジメチル−2,5−ジ(t−ブチルパーオキシ)ヘキシン−3、ベンゾイルパーオキサイド、クミルパーオキシネオデカネート、t−ブチルパーオキシベンゾエート、2,5−ジメチル−2,5−ジ(ベンゾイルパーオキシ)ヘキサン、t−ブチルパーオキシイソプロピルカーボネート、t−ブチルパーオキシアリルカーボネートなどが挙げられ、これらは単独で用いられても二種以上が併用されてもよい。 Examples of the organic peroxide include 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane, 1,1-bis (t-butylperoxy) cyclohexane, 2,2-bis ( t-butylperoxy) octane, n-butyl-4,4-bis (t-butylperoxy) valerate, di-t-butyl peroxide, t-butylcumyl peroxide, dicumyl peroxide, α, α ′ -Bis (t-butylperoxy-m-isopropyl) benzene, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butyl) Peroxy) hexyne-3, benzoyl peroxide, cumyl peroxyneodecanate, t-butyl peroxybenzoate, 2,5-dimethyl-2,5-di (ben (Zoylperoxy) hexane, t-butylperoxyisopropyl carbonate, t-butylperoxyallyl carbonate and the like may be mentioned, and these may be used alone or in combination of two or more.
前記有機過酸化物は、前記ポリオレフィン系樹脂100質量部に対し、0.01質量部〜5質量部の範囲であることが好ましく、0.1質量部〜3質量部の範囲であることが、前記有機過酸化物の分解残渣の残留を抑制するうえでより好ましい。 The organic peroxide is preferably in the range of 0.01 to 5 parts by mass, and in the range of 0.1 to 3 parts by mass with respect to 100 parts by mass of the polyolefin resin. It is more preferable for suppressing the residue of the decomposition residue of the organic peroxide.
また、ポリオレフィン系樹脂シートを発泡させる方法としては、特には限定されず、例えば、熱風により加熱する方法、赤外線により加熱する方法、塩浴による方法、オイルバスによる方法などが挙げられ、これらは併用してもよい。なかでも熱風により加熱する方法や赤外線により加熱する方法が、ポリオレフィン系発泡体基材の表裏面の外観の差異が少なくなるため好ましい。 The method of foaming the polyolefin resin sheet is not particularly limited, and examples thereof include a method of heating with hot air, a method of heating with infrared rays, a method using a salt bath, a method using an oil bath, and the like. May be. Among them, the method of heating with hot air or the method of heating with infrared rays is preferable because the difference in appearance between the front and back surfaces of the polyolefin-based foam substrate is reduced.
前記発泡体基材は、延伸されていてもよい。前記延伸は、ポリオレフィン系樹脂シートを発泡させて発泡体基材を得た後に行ってもよいし、ポリオレフィン系樹脂シートを発泡させる際に行ってもよい。 The foam substrate may be stretched. The stretching may be performed after foaming the polyolefin resin sheet to obtain a foam substrate, or may be performed when foaming the polyolefin resin sheet.
ポリオレフィン系樹脂シートを発泡させて発泡体基材を得た後、発泡体基材を延伸する場合、発泡体基材を冷却することなく発泡時の溶融状態を維持したまま続けて発泡体基材を延伸しても、発泡体基材を冷却した後、再度、発泡シートを加熱して溶融又は軟化状態とした上で発泡体基材を延伸してもよい。 After foaming a polyolefin resin sheet to obtain a foam base material, when the foam base material is stretched, the foam base material is continuously maintained while maintaining the molten state at the time of foaming without cooling the foam base material. Even after stretching, the foam base material may be stretched after cooling the foam base material and heating the foam sheet again to a molten or softened state.
前記発泡体基材の溶融状態とは、発泡体基材を、発泡体基材を構成しているポリオレフィン系樹脂の融点以上に加熱した状態をいう。また、発泡体基材の軟化とは、発泡体基材を構成しているポリオレフィン系樹脂の軟化点以上融点未満までの温度に加熱した状態をいう。上記発泡体基材を延伸することによって、発泡体基材の気泡を所定方向に延伸し変形させて、気泡のアスペクト比が所定範囲内となったポリオレフィン系発泡体を製造することができる。 The molten state of the foam base material means a state in which the foam base material is heated to a temperature equal to or higher than the melting point of the polyolefin resin constituting the foam base material. Further, the softening of the foam base material refers to a state where the foam base material is heated to a temperature not lower than the melting point and lower than the melting point of the polyolefin resin constituting the foam base material. By stretching the foam base material, the foam of the foam base material can be produced by stretching the foam base material in a predetermined direction and deforming the foam base material so that the aspect ratio of the foam is within a predetermined range.
前記発泡体基材の延伸方向は、長尺状のポリオレフィン系樹脂シートの流れ方向若しくは幅方向に向かって、又は、流れ方向および幅方向であることが好ましい。なお、発泡体基材を流れ方向および幅方向に向かって延伸させる場合、発泡体基材を流れ方向および幅方向に向かって同時に延伸してもよいし、一方向ずつ別々に延伸してもよい。 The extending direction of the foam base material is preferably in the flow direction or the width direction of the elongated polyolefin resin sheet, or in the flow direction and the width direction. When the foam base material is stretched in the flow direction and the width direction, the foam base material may be stretched simultaneously in the flow direction and the width direction, or may be stretched separately one by one. .
上記発泡体基材を流れ方向に延伸する方法としては、例えば、長尺状のポリオレフィン系樹脂シートを発泡工程に供給する速度(供給速度)よりも、発泡後に長尺状のポリオレフィン系樹脂シートを冷却しながら巻き取る速度(巻取速度)を速くすることによって発泡体基材を流れ方向に延伸する方法、得られた発泡体基材を延伸工程に供給する速度(供給速度)よりも、発泡体基材を巻き取る速度(巻取速度)を速くすることによって発泡体基材を流れ方向に延伸する方法などが挙げられる。 As a method of stretching the foam base material in the flow direction, for example, a long polyolefin resin sheet after foaming is used rather than a speed (supply speed) at which the long polyolefin resin sheet is supplied to the foaming process. A method of stretching the foam base material in the flow direction by increasing the winding speed (winding speed) while cooling, foaming rather than the speed (supply speed) of supplying the obtained foam base material to the stretching process Examples include a method of stretching the foam base material in the flow direction by increasing the speed of winding the body base material (winding speed).
前記ポリオレフィン系樹脂シートは、それ自身の発泡によって流れ方向に膨張しやすいため、前記ポリオレフィン系樹脂シートを用いて得られた発泡体基材を流れ方向に延伸する場合には、ポリオレフィン系樹脂シートの発泡による流れ方向への膨張分を考慮し、その膨張分以上に、ポリオレフィン系樹脂シートが流れ方向に延伸されるように、発泡体基材の供給速度と巻取り速度とを調整することが好ましい。 Since the polyolefin resin sheet easily expands in the flow direction due to its own foaming, when the foam base material obtained using the polyolefin resin sheet is stretched in the flow direction, the polyolefin resin sheet Considering the amount of expansion in the flow direction due to foaming, it is preferable to adjust the supply speed and winding speed of the foam substrate so that the polyolefin resin sheet is stretched in the flow direction more than the expansion amount. .
前記発泡体基材を幅方向に延伸する方法としては、発泡体基材の幅方向の両端部を一対の把持部材によって把持し、この一対の把持部材を互いに離間する方向に徐々に移動させることによって発泡体基材を幅方向に延伸させる方法が好ましい。なお、ポリオレフィン系樹脂シートは、それ自身の発泡によって幅方向に膨張するので、発泡体基材を幅方向に延伸する場合には、ポリオレフィン系樹脂シートの発泡による幅方向への膨張分を考慮した上で、その膨張分以上に発泡体基材が幅方向に延伸されるように調整することが好ましい。 As a method of stretching the foam base material in the width direction, both ends in the width direction of the foam base material are gripped by a pair of gripping members, and the pair of gripping members are gradually moved in directions away from each other. A method of stretching the foam base material in the width direction is preferred. Since the polyolefin resin sheet expands in the width direction by its own foaming, when the foam base material is stretched in the width direction, the expansion in the width direction due to the foaming of the polyolefin resin sheet is taken into account. Above, it is preferable to adjust so that a foam base material may be extended | stretched in the width direction more than the expansion | swelling part.
前記発泡体基材の流れ方向における延伸倍率は1.1〜5倍が好ましく、1.3〜3.5倍がより好ましい。また、その幅方向における延伸倍率は1.2〜4.5倍が好ましく、1.5倍〜3.5倍であることがより好ましい。前記範囲の延伸倍率を備えた発泡体基材を使用することによって、良好な柔軟性と引張強さとを維持することができる。 The draw ratio in the flow direction of the foam substrate is preferably 1.1 to 5 times, and more preferably 1.3 to 3.5 times. Further, the draw ratio in the width direction is preferably 1.2 to 4.5 times, and more preferably 1.5 to 3.5 times. By using a foam base material having a draw ratio in the above range, good flexibility and tensile strength can be maintained.
前記発泡体基材としては、意匠性、遮光性、隠蔽性、光反射性、耐光性等を備えた粘着テープを得るうえで、着色された発泡体基材を使用してもよい。前記着色の際には、従来知られる着色剤を、単独または2種類以上組み合わせて用いることができる。 As the foam base material, a colored foam base material may be used in order to obtain an adhesive tape having design properties, light shielding properties, concealing properties, light reflectivity, light resistance, and the like. In the case of the said coloring, a conventionally known coloring agent can be used individually or in combination of 2 or more types.
粘着テープに遮光性や隠蔽性や耐光性を付与する場合、前記発泡体基材としては、黒色に着色されたものを使用することが好ましい。 When the light-shielding property, the concealing property and the light resistance are imparted to the adhesive tape, it is preferable to use a material colored black as the foam base material.
前記黒色の着色剤としては、例えばカーボンブラック、グラファイト、酸化銅、二酸化マンガン、アニリンブラック、ペリレンブラック、チタンブラック、シアニンブラック、活性炭、フェライト、マグネタイト、酸化クロム、酸化鉄、二硫化モリブデン、クロム錯体、複合酸化物系黒色色素、アントラキノン系有機黒色色素などを用いることができる。なかでも、前記着色剤としては、コスト、入手性、絶縁性、ポリオレフィン系樹脂組成物を押し出す工程や加熱発泡工程の温度に耐えうるレベルの耐熱性の観点から、カーボンブラックを使用することが好ましい。 Examples of the black colorant include carbon black, graphite, copper oxide, manganese dioxide, aniline black, perylene black, titanium black, cyanine black, activated carbon, ferrite, magnetite, chromium oxide, iron oxide, molybdenum disulfide, and chromium complex. , Complex oxide black dyes, anthraquinone organic black dyes, and the like can be used. Among these, as the colorant, it is preferable to use carbon black from the viewpoint of cost, availability, insulation, and heat resistance at a level that can withstand the temperature of the process of extruding the polyolefin resin composition and the heating and foaming process. .
また、前記粘着テープに意匠性や光反射性などを付与する場合、前記発泡体基材としては、白色に着色されたものを使用することが好ましい。 Moreover, when providing the said adhesive tape with designability, light reflectivity, etc., it is preferable to use what was colored white as said foam base material.
前記白色着色剤としては、例えば酸化チタン、酸化亜鉛、酸化アルミニウム、酸化ケイ素、酸化マグネシウム、酸化ジルコニウム、酸化カルシウム、酸化スズ、酸化バリウム、酸化セシウム、酸化イットリウム、炭酸マグネシウム、炭酸カルシウム、炭酸バリウム、炭酸亜鉛、水酸化アルミニウム、水酸化マグネシウム、水酸化カルシウム、水酸化亜鉛、ケイ酸アルミニウム、ケイ酸カルシウム、硫酸バリウム、硫酸カルシウム、ステアリン酸バリウム、亜鉛華、タルク、シリカ、アルミナ、クレー、カオリン、リン酸チタン、マイカ、石膏、ホワイトカーボン、珪藻土、ベントナイト、リトポン、ゼオライト、セリサイト、などの無機系白色着色剤やシリコーン系樹脂粒子、アクリル系樹脂粒子、ウレタン系樹脂粒子、メラミン系樹脂粒子などの有機系白色着色剤などを用いることができる。なかでも、前記着色剤としては、コスト、入手性、色調、ポリオレフィン系樹脂組成物を押し出す工程や加熱発泡工程の温度に耐える耐熱性の観点から、酸化チタンや酸化アルミニウムや酸化亜鉛を使用することが好ましい。 Examples of the white colorant include titanium oxide, zinc oxide, aluminum oxide, silicon oxide, magnesium oxide, zirconium oxide, calcium oxide, tin oxide, barium oxide, cesium oxide, yttrium oxide, magnesium carbonate, calcium carbonate, barium carbonate, Zinc carbonate, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, zinc hydroxide, aluminum silicate, calcium silicate, barium sulfate, calcium sulfate, barium stearate, zinc white, talc, silica, alumina, clay, kaolin, Inorganic white colorants such as titanium phosphate, mica, gypsum, white carbon, diatomaceous earth, bentonite, lithopone, zeolite, sericite, silicone resin particles, acrylic resin particles, urethane resin particles, melamine resin particles Which organic white colorants or the like can be used. Among these, as the colorant, titanium oxide, aluminum oxide, or zinc oxide should be used from the viewpoint of cost, availability, color tone, heat resistance that can withstand the temperature of the process of extruding the polyolefin resin composition and the heating and foaming process. Is preferred.
前記発泡体基材は、必要に応じて、可塑剤、酸化防止剤、酸化亜鉛などの発泡助剤、気泡核調整材、熱安定剤、水酸化アルミニウムや水酸化マグネシウムなどの難燃剤、帯電防止剤、ガラス製やプラスチック製の中空バルーン・ビーズ、金属粉末、金属化合物等の充填材、導電性フィラー、熱伝導性フィラーなどの公知のものを含有するものであってもよい。 If necessary, the foam base material may be a plasticizer, an antioxidant, a foaming aid such as zinc oxide, a cell core modifier, a heat stabilizer, a flame retardant such as aluminum hydroxide or magnesium hydroxide, and an antistatic agent. It may contain known agents such as agents, fillers such as glass or plastic hollow balloons / beads, metal powders, metal compounds, conductive fillers, and heat conductive fillers.
なお、前記着色剤や熱分解性発泡剤や発泡助剤等は、色の濃淡ムラなどの外観不良や、過剰な発泡や無発泡などの発泡不良を防止するうえで、ポリオレフィン系樹脂、または、前記ポリオレフィン系樹脂と相溶しやすい他の熱可塑性樹脂によってマスターバッチ化されていることが好ましい。 In addition, the colorant, the thermally decomposable foaming agent, the foaming auxiliary agent, etc., in order to prevent poor appearance such as uneven color shading, and poor foaming such as excessive foaming and non-foaming, a polyolefin resin, or It is preferable that the masterbatch is made of another thermoplastic resin that is easily compatible with the polyolefin resin.
前記発泡体基材としては、粘着剤層や他の層との密着性を向上させるため、コロナ処理、火炎処理、プラズマ処理、熱風処理、オゾン処理、紫外線処理、易接着処理等の表面処理の施されたものを使用することができる。 As the foam base material, surface treatment such as corona treatment, flame treatment, plasma treatment, hot air treatment, ozone treatment, ultraviolet treatment, and easy adhesion treatment is performed in order to improve the adhesion with the pressure-sensitive adhesive layer and other layers. The applied one can be used.
前記表面処理された発泡体基材の表面は、ぬれ試薬によるぬれ指数が36mN/m以上であることが好ましく、40mN/m以上であることが好ましく、48mN/m以上であることが、粘着剤層等との良好な密着性を維持するうえでさらに好ましい。 The surface of the surface-treated foam base material preferably has a wetting index by a wetting reagent of 36 mN / m or more, preferably 40 mN / m or more, and 48 mN / m or more. It is further preferable for maintaining good adhesion with a layer or the like.
密着性を向上させた発泡体基材は、連続工程で粘着剤層と貼り合わされてもよい。また、密着性を向上させた発泡体基材は一旦巻き取り加工をして保管したのち、後日粘着剤層と貼り合わされてもよい。 The foam base material with improved adhesion may be bonded to the pressure-sensitive adhesive layer in a continuous process. Further, the foam base material with improved adhesion may be temporarily wound up and stored, and then bonded to the adhesive layer at a later date.
なお、密着性を向上させた発泡体基材を一旦巻き取る場合、前記発泡体基材のブロッキングを防止するうえで、紙やポリエチレンやポリプロピレンやポリエステル等からなるフィルムを介して巻き取ることが好ましい。前記フィルムは、厚さ25μm以下のポリプロピレンフィルムやポリエステルフィルムであることが好ましい。 In addition, when winding up the foam base material having improved adhesion, it is preferable to wind it through a film made of paper, polyethylene, polypropylene, polyester, or the like in order to prevent blocking of the foam base material. . The film is preferably a polypropylene film or a polyester film having a thickness of 25 μm or less.
[粘着剤層]
本発明の両面粘着テープが有する粘着剤層は、発泡体基材の表裏面(両面)に設けられる。各面に設けられる粘着剤層のうち、少なくとも一方、好ましくは両方の粘着剤層は、厚さ25μmのポリエチレンテレフタレート基材に厚さ25μmの粘着剤層を設けて形成した粘着テープを、温度23℃及び相対湿度65%RHの環境下でアルミニウム板に、2kgローラーを使用し一往復させることで圧着させ、温度23℃及び相対湿度50%RHの環境下に1時間静置した後に測定される剥離速度300mm/minにおける180°引き剥がし接着力が12N/20mm以上の粘着剤層である。前記特定の粘着剤層を使用することによって、解体時に一定の力を加えることで発泡体基材の層間割れを実現でき、かつ優れた耐衝撃性を備えた両面粘着テープを得ることができる。[Adhesive layer]
The adhesive layer which the double-sided adhesive tape of this invention has is provided in the front and back (both surfaces) of a foam base material. At least one of the pressure-sensitive adhesive layers provided on each surface, preferably both pressure-sensitive adhesive layers are formed by forming a pressure-sensitive adhesive tape formed by providing a 25 μm-thick pressure-sensitive adhesive layer on a 25 μm-thick polyethylene terephthalate substrate. Measured after pressure-bonding to an aluminum plate by reciprocating once using an aluminum plate in an environment of ℃ and relative humidity of 65% RH, and standing for 1 hour in an environment of temperature of 23 ℃ and relative humidity of 50% RH. It is a pressure-sensitive adhesive layer having a 180 ° peeling adhesive strength of 12 N / 20 mm or more at a peeling speed of 300 mm / min. By using the specific pressure-sensitive adhesive layer, it is possible to obtain a double-sided pressure-sensitive adhesive tape that can realize interlaminar cracking of the foam base material by applying a certain force at the time of disassembly and that has excellent impact resistance.
前記粘着剤層としては、10N/20mm以上の180°引き剥がし接着力を有するものを使用することが好ましく、12N/20mm以上の180°引き剥がし接着力を有するものを使用することが、解体時に一定の力を加えることで発泡体基材の層間割れを実現でき、かつ優れた耐衝撃性を備えた両面粘着テープを得るうえで好ましい。 As the pressure-sensitive adhesive layer, it is preferable to use a layer having a 180 ° peeling adhesive strength of 10 N / 20 mm or more, and a layer having a 180 ° peeling adhesive strength of 12 N / 20 mm or more can be used at the time of disassembly. It is preferable to obtain a double-sided pressure-sensitive adhesive tape that can realize interlaminar cracking of the foam base material by applying a certain force and has excellent impact resistance.
前記180°引き剥がし接着力の上限は、特に制限されないが、25N/20mm以下であることが好ましく、20N/20mm以下であることがより好ましい。 The upper limit of the 180 ° peeling adhesion is not particularly limited, but is preferably 25 N / 20 mm or less, and more preferably 20 N / 20 mm or less.
前記粘着剤層を形成可能な粘着剤組成物としては、例えば(メタ)アクリル系粘着剤、ウレタン系粘着剤、合成ゴム系粘着剤、天然ゴム系粘着剤、シリコーン系粘着剤等を使用することができる。なかでも、前記粘着剤組成物としては、アクリル系重合体をベースポリマーとし、必要に応じて粘着付与樹脂や架橋剤等の添加剤を含有するアクリル系粘着剤組成物を使用することが、所望の180°引き剥がし接着力等を備えた粘着剤層を形成するうえで好ましい。 As the pressure-sensitive adhesive composition capable of forming the pressure-sensitive adhesive layer, for example, a (meth) acrylic pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a synthetic rubber-based pressure-sensitive adhesive, a natural rubber-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, or the like is used. Can do. Among these, as the pressure-sensitive adhesive composition, it is desirable to use an acrylic pressure-sensitive adhesive composition containing an acrylic polymer as a base polymer and containing additives such as a tackifier resin and a crosslinking agent as necessary. It is preferable for forming a pressure-sensitive adhesive layer having a 180 ° peeling adhesive strength.
前記アクリル系重合体の製造に使用可能な(メタ)アクリレートとしては、例えばメチル(メタ)アクリレート、エチル(メタ)アクリレート、n−ブチル(メタ)アクリレート、イソブチル(メタ)アクリレート、t−ブチル(メタ)アクリレート、n−ヘキシル(メタ)アクリレート、n−オクチル(メタ)アクリレート、イソオクチル(メタ)アクリレート、イソノニル(メタ)アクリレート、シクロヘキシル(メタ)アクリレート、2−エチルヘキシル(メタ)アクリレート等の炭素原子数1〜12のアルキル基を有する(メタ)アクリレート等が挙げられ、これらの1種または2種以上を使用することができる。なかでも、炭素原子数4〜12のアルキル基を有する(メタ)アクリレートを使用することが好ましく、炭素原子数4〜8の直鎖または分岐したアルキル基を有する(メタ)アクリレートを使用することがより好ましく、n−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からなる群より選ばれる1種以上を使用することが、所望の180°引き剥がし接着力等を備えた粘着剤層を形成するうえで好ましい。 Examples of the (meth) acrylate that can be used for the production of the acrylic polymer include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, and t-butyl (meth) ) Acrylate, n-hexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, etc. (Meth) acrylate etc. which have an alkyl group of -12 are mentioned, These 1 type (s) or 2 or more types can be used. Among these, it is preferable to use (meth) acrylate having an alkyl group having 4 to 12 carbon atoms, and to use (meth) acrylate having a linear or branched alkyl group having 4 to 8 carbon atoms. More preferably, it is preferable to use at least one selected from the group consisting of n-butyl acrylate and 2-ethylhexyl acrylate in order to form a pressure-sensitive adhesive layer having a desired 180 ° peel-off adhesive force and the like.
前記炭素原子数1〜12のアルキル基を有する(メタ)アクリレートは、前記アクリル系重合体の製造に使用する単量体成分の全量に対して、60質量%以上使用することが好ましく、80質量%〜98.5質量%使用することがより好ましく、90質量%〜98.5質量%使用することがさらに好ましい。 The (meth) acrylate having an alkyl group having 1 to 12 carbon atoms is preferably used in an amount of 60% by mass or more, based on the total amount of monomer components used in the production of the acrylic polymer, and is 80% by mass. % To 98.5 mass% is more preferable, and 90 mass% to 98.5 mass% is more preferable.
前記アクリル系重合体を製造する際には、単量体成分として高極性ビニル単量体を使用することができる。前記高極性ビニル単量体としては、水酸基を有するビニル単量体、カルボキシル基を有するビニル単量体、アミド基を有するビニル単量体等が挙げられ、これらの1種または2種以上を使用することができる。 In producing the acrylic polymer, a highly polar vinyl monomer can be used as a monomer component. Examples of the highly polar vinyl monomer include a vinyl monomer having a hydroxyl group, a vinyl monomer having a carboxyl group, a vinyl monomer having an amide group, etc., and one or more of these are used. can do.
水酸基を有するビニル単量体としては、例えば2−ヒドロキシエチル(メタ)アクリレート、2−ヒドロキシプロピル(メタ)アクリレート、4−ヒドロキシブチル(メタ)アクリレート、6−ヒドロキシヘキシル(メタ)アクリレート等などの水酸基を有する(メタ)アクリレートを使用できる。 Examples of the vinyl monomer having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate and the like. (Meth) acrylates having the following can be used.
カルボキシル基を有するビニル単量体としては、例えばアクリル酸、メタクリル酸、イタコン酸、マレイン酸、(メタ)アクリル酸2量体、クロトン酸、エチレンオキサイド変性琥珀酸アクリレート等を使用することができ、なかでもアクリル酸を使用することが好ましい。 As the vinyl monomer having a carboxyl group, for example, acrylic acid, methacrylic acid, itaconic acid, maleic acid, (meth) acrylic acid dimer, crotonic acid, ethylene oxide-modified oxalic acid acrylate, etc. can be used. Of these, acrylic acid is preferably used.
アミド基を有するビニル単量体としては、例えばN−ビニルピロリドン、N−ビニルカプロラクタム、アクリロイルモルホリン、アクリルアミド、N,N−ジメチルアクリルアミド等を使用することができる。 As the vinyl monomer having an amide group, for example, N-vinylpyrrolidone, N-vinylcaprolactam, acryloylmorpholine, acrylamide, N, N-dimethylacrylamide and the like can be used.
その他の高極性ビニル単量体としては、酢酸ビニル、エチレンオキサイド変性琥珀酸アクリレート、2−アクリルアミド−2−メチルプロパンスルフォン酸等のスルホン酸基を有するビニル単量体等を使用することができる。 As other highly polar vinyl monomers, vinyl monomers having a sulfonic acid group such as vinyl acetate, ethylene oxide-modified succinic acid acrylate, and 2-acrylamido-2-methylpropanesulfonic acid can be used.
前記高極性ビニル単量体は、前記アクリル系重合体の製造に使用する単量体成分の全量に対して1.5質量%〜20質量%の範囲で使用することが好ましく、1.5質量%〜10質量%の範囲で使用することがより好ましく、2質量%〜8質量%の範囲で使用することが、所望の180°引き剥がし接着力等を備えた粘着剤層を形成するうえで好ましい。 The high-polarity vinyl monomer is preferably used in a range of 1.5% by mass to 20% by mass with respect to the total amount of monomer components used in the production of the acrylic polymer. It is more preferable to use in the range of 10% by mass to 10% by mass, and it is preferable to use in the range of 2% by mass to 8% by mass for forming a pressure-sensitive adhesive layer having a desired 180 ° peel-off adhesive force and the like. preferable.
また、前記粘着剤組成物として、前記アクリル系重合体とともにイソシアネート系架橋剤を使用する場合、そのイソシアネート基と反応する官能基を有するアクリル系重合体を使用することが好ましい。 Moreover, when using an isocyanate type crosslinking agent with the said acrylic polymer as said adhesive composition, it is preferable to use the acrylic polymer which has a functional group which reacts with the isocyanate group.
その際に使用可能な単量体成分としては、例えば水酸基を有するビニル単量体を使用することが好ましく、2−ヒドロキシエチル(メタ)アクリレート、4−ヒドロキシブチル(メタ)アクリレート、6−ヒドロキシヘキシル(メタ)アクリレート等を使用することがより好ましい。 As a monomer component that can be used in this case, for example, a vinyl monomer having a hydroxyl group is preferably used, and 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 6-hydroxyhexyl. It is more preferable to use (meth) acrylate or the like.
前記水酸基を有するビニル単量体は、前記アクリル系重合体の製造に使用する単量体成分の合計に対して0.01質量%〜1.0質量%の範囲で使用することが好ましく、0.03質量%〜0.3質量%の範囲で使用することがより好ましい。 The vinyl monomer having a hydroxyl group is preferably used in the range of 0.01% by mass to 1.0% by mass with respect to the total of monomer components used for the production of the acrylic polymer. It is more preferable to use in the range of 0.03 mass% to 0.3 mass%.
前記アクリル系重合体は、前記単量体成分を重合させることによって製造することができる。前記重合方法としては、溶液重合法、隗状重合法、懸濁重合法、乳化重合法等の公知の重合方法が挙げられ、良好な耐水性を備えた粘着剤組成物を得るうえで、溶液重合法または塊状重合法を採用することが好ましい。 The acrylic polymer can be produced by polymerizing the monomer component. Examples of the polymerization method include known polymerization methods such as a solution polymerization method, a cage polymerization method, a suspension polymerization method, and an emulsion polymerization method, and a solution for obtaining a pressure-sensitive adhesive composition having good water resistance. It is preferable to employ a polymerization method or a bulk polymerization method.
前記重合は、過酸化ベンゾイルや過酸化ラウロイル等の過酸化物系熱重合開始剤、アゾビスイソブチルニトリル等のアゾ系の熱重合開始剤を用いる方法、アセトフェノン系光重合開始剤、ベンゾインエーテル系光重合開始剤、ベンジルケタール系光重合開始剤、アシルフォスフィンオキシド系光重合開始剤、ベンゾイン系光重合開始剤、ベンゾフェノン系の光重合開始剤を用いる方法、電子線を照射する方法によって開始し、進行させることができる。 For the polymerization, a method using a peroxide thermal polymerization initiator such as benzoyl peroxide or lauroyl peroxide, an azo thermal polymerization initiator such as azobisisobutylnitrile, an acetophenone photopolymerization initiator, a benzoin ether photopolymer Polymerization initiator, benzyl ketal photopolymerization initiator, acyl phosphine oxide photopolymerization initiator, benzoin photopolymerization initiator, a method using a benzophenone photopolymerization initiator, a method of irradiating an electron beam, Can be advanced.
前記アクリル系重合体としては、ゲルパーミエッションクロマトグラフ(GPC)で測定される標準ポリスチレン換算での重量平均分子量が40万〜300万の範囲であるものを使用することが好ましく、80万〜250万の範囲であるものを使用することがより好ましい。 As the acrylic polymer, it is preferable to use a polymer having a weight average molecular weight in terms of standard polystyrene measured by gel permeation chromatograph (GPC) in the range of 400,000 to 3 million. It is more preferable to use one having a range of 2.5 million.
ここで、GPC法による分子量の測定は、東ソー株式会社製GPC装置(HLC−8329GPC)を用いて測定される、スタンダードポリスチレン換算値であり、測定条件は以下のとおりである。 Here, the measurement of the molecular weight by the GPC method is a standard polystyrene conversion value measured using a GPC device (HLC-8329GPC) manufactured by Tosoh Corporation, and the measurement conditions are as follows.
サンプル濃度:0.5質量%(テトラヒドロフラン溶液)
サンプル注入量:100μl
溶離液:THF
流速:1.0ml/分
測定温度:40℃
本カラム:TSKgel GMHHR−H(20)2本
ガードカラム:TSKgel HXL−H
検出器:示差屈折計
スタンダードポリスチレン分子量:1万〜2000万(東ソー株式会社製)Sample concentration: 0.5% by mass (tetrahydrofuran solution)
Sample injection volume: 100 μl
Eluent: THF
Flow rate: 1.0 ml / min Measurement temperature: 40 ° C
This column: TSKgel GMHHR-H (20) 2 Guard column: TSKgel HXL-H
Detector: differential refractometer Standard polystyrene molecular weight: 10,000 to 20 million (manufactured by Tosoh Corporation)
本発明に使用する粘着剤組成物としては、被着体との密着性や面接着強度をより一層向上させることを目的として、粘着付与樹脂を含有するものを使用することが好ましい。粘着付与樹脂としては、ロジン系粘着付与樹脂、重合ロジン系粘着付与樹脂、重合ロジンエステル系粘着付与樹脂、ロジンフェノール系粘着付与樹脂、安定化ロジンエステル系粘着付与樹脂、不均化ロジンエステル系粘着付与樹脂、水添ロジンエステル系粘着付与樹脂、テルペン系粘着付与樹脂、テルペンフェノール系粘着付与樹脂、石油樹脂系粘着付与樹脂、(メタ)アクリレート樹脂系粘着付与樹脂等を使用することができる。 As the pressure-sensitive adhesive composition used in the present invention, a pressure-sensitive adhesive composition containing a tackifying resin is preferably used for the purpose of further improving the adhesion to the adherend and the surface adhesion strength. Examples of tackifier resins include rosin-based tackifier resins, polymerized rosin-based tackifier resins, polymerized rosin ester-based tackifier resins, rosin phenol-based tackifier resins, stabilized rosin ester-based tackifier resins, and disproportionated rosin ester-based tackifiers. An imparting resin, a hydrogenated rosin ester tackifier resin, a terpene tackifier resin, a terpene phenol tackifier resin, a petroleum resin tackifier resin, a (meth) acrylate resin tackifier resin, or the like can be used.
なかでも、前記粘着付与樹脂としては、不均化ロジンエステル系粘着付与樹脂、重合ロジンエステル系粘着付与樹脂、ロジンフェノール系粘着付与樹脂、水添ロジンエステル系粘着付与樹脂、(メタ)アクリレート樹脂系粘着付与樹脂、テルペンフェノール系粘着付与樹脂を単独または2種以上組み合わせ使用することが好ましい。 Among them, as the tackifying resin, disproportionated rosin ester tackifying resin, polymerized rosin ester tackifying resin, rosin phenol tackifying resin, hydrogenated rosin ester tackifying resin, (meth) acrylate resin It is preferable to use a tackifier resin and a terpene phenol tackifier resin alone or in combination of two or more.
前記粘着剤組成物としてエマルジョン型の粘着剤組成物を使用する場合、前記粘着付与樹脂としては、エマルジョン型の粘着付与樹脂を使用することが好ましい。 When an emulsion-type pressure-sensitive adhesive composition is used as the pressure-sensitive adhesive composition, it is preferable to use an emulsion-type pressure-sensitive adhesive resin as the tackifier resin.
前記粘着付与樹脂としては、30℃〜180℃の軟化点を有するものを使用することが好ましく、70℃〜140℃の軟化点を有するものを使用することが、所望の180°引き剥がし接着力等を備えた粘着剤層を形成するうえで好ましい。前記(メタ)アクリレート系粘着付与樹脂を使用する場合、前記(メタ)アクリレート系粘着付与樹脂としては、30℃〜200℃のガラス転移温度を有するものを使用することが好ましく、50℃〜160℃のものを使用することがより好ましい。 As the tackifying resin, a resin having a softening point of 30 ° C. to 180 ° C. is preferably used, and a resin having a softening point of 70 ° C. to 140 ° C. is used to peel off the desired 180 ° adhesive strength. It is preferable when forming a pressure-sensitive adhesive layer having the above. When using the said (meth) acrylate type tackifying resin, it is preferable to use what has a glass transition temperature of 30 to 200 degreeC as said (meth) acrylate type tackifying resin, 50 to 160 degreeC. It is more preferable to use those.
前記粘着付与樹脂は、前記アクリル系重合体100質量部に対して、5質量部〜65質量部の範囲で使用することが好ましく、8質量部〜55質量部の範囲で使用することが、所望の180°引き剥がし接着力等を備えた粘着剤層を形成するうえで好ましい。 The tackifying resin is preferably used in the range of 5 to 65 parts by mass, and preferably in the range of 8 to 55 parts by mass with respect to 100 parts by mass of the acrylic polymer. It is preferable for forming a pressure-sensitive adhesive layer having a 180 ° peeling adhesive strength.
前記粘着剤組成物としては、前記アクリル系重合体や粘着付与樹脂の他に、必要に応じて架橋剤を含有するものを使用することが、凝集力の高い粘着剤層を形成するうえで好ましい。 As the pressure-sensitive adhesive composition, in addition to the acrylic polymer and tackifying resin, it is preferable to use a material containing a crosslinking agent as necessary in order to form a pressure-sensitive adhesive layer having a high cohesive force. .
前記架橋剤としては、例えばイソシアネート系架橋剤、エポキシ系架橋剤、金属キレート系架橋剤、アジリジン系架橋剤等を使用することができる。 As said crosslinking agent, an isocyanate type crosslinking agent, an epoxy-type crosslinking agent, a metal chelate type crosslinking agent, an aziridine type crosslinking agent etc. can be used, for example.
なかでも、前記架橋剤としては、アクリル系重合体との反応性に富むイソシアネート系架橋剤及びエポキシ系架橋剤を単独または組み合わせ使用することが好ましく、イソシアネート系架橋剤を使用することが、粘着剤層と発泡体基材との密着性をより一層向上できるため好ましい。 Among these, as the cross-linking agent, it is preferable to use an isocyanate cross-linking agent and an epoxy cross-linking agent rich in reactivity with an acrylic polymer alone or in combination, and the use of an isocyanate cross-linking agent is a pressure-sensitive adhesive. This is preferable because the adhesion between the layer and the foam substrate can be further improved.
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、ナフチレン−1,5−ジイソシアネート、ヘキサメチ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、キシリレンジイソシアネート、トリメチロールプロパン変性トリレンジイソシアネート等を使用することができる。なかでも、前記イソシアネート系架橋剤としては、イソシアネート基を3つ以上有するものを使用することが好ましく、具体的には、トリレンジイソシアネートのトリメチロールプロパン付加体、トリフェニルメタントリイソシアネート等が挙げられる。 Examples of the isocyanate-based crosslinking agent include tolylene diisocyanate, naphthylene-1,5-diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, trimethylolpropane-modified tolylene diisocyanate, and the like. Especially, as said isocyanate type crosslinking agent, it is preferable to use what has three or more isocyanate groups, Specifically, the trimethylol propane adduct of tolylene diisocyanate, a triphenylmethane triisocyanate, etc. are mentioned. .
前記粘着剤組成物としては、前記した成分の他に必要に応じて可塑剤、軟化剤、酸化防止剤、難燃剤、ガラスやプラスチック製の繊維、バルーン、ビーズ、金属粉末、金属酸化物、金属窒化物等の充填剤、顔料や染料等の着色剤、レベリング剤、増粘剤、撥水剤、消泡剤等の添加剤を含有するものを使用することができる。 As the pressure-sensitive adhesive composition, in addition to the above-described components, plasticizers, softeners, antioxidants, flame retardants, glass and plastic fibers, balloons, beads, metal powders, metal oxides, metals as necessary Those containing additives such as fillers such as nitrides, colorants such as pigments and dyes, leveling agents, thickeners, water repellents, and antifoaming agents can be used.
前記粘着剤組成物を用いて形成された粘着剤層としては、周波数1Hzにおける損失正接(tanδ)のピーク値を示す温度が−40℃〜15℃の範囲であるものを使用することが、所望の180°引き剥がし接着力を備え、常温下での被着体との良好な密着性を付与するうえで好ましい。一方、前記粘着剤層としては、前記温度が−35℃〜10℃であるものを使用することが、所望の180°引き剥がし接着力を備え、常温下での被着体との良好な密着性を備え、かつ、低温環境下での耐衝撃性をより一層向上させるうえで好ましく、−30℃〜6℃であるものを使用することがより好ましい。 As the pressure-sensitive adhesive layer formed using the pressure-sensitive adhesive composition, it is desirable to use a layer having a temperature at which the peak value of loss tangent (tan δ) at a frequency of 1 Hz is in the range of −40 ° C. to 15 ° C. It is preferable for providing a good adhesion with an adherend at room temperature at a normal temperature. On the other hand, as the pressure-sensitive adhesive layer, it is preferable to use a layer having a temperature of −35 ° C. to 10 ° C., which has a desired 180 ° peel-off adhesive force and has good adhesion to an adherend at room temperature. It is preferable to further improve the impact resistance in a low temperature environment, and it is more preferable to use a material having a temperature of -30 ° C to 6 ° C.
周波数1Hzにおける損失正接(tanδ)は、温度分散による動的粘弾性測定で得られた貯蔵弾性率(G’)、損失弾性率(G”)から、tanδ=G”/G’の式より求められる。動的粘弾性の測定においては、粘弾性試験機(ティ・エイ・インスツルメント・ジャパン社製、商品名:ARES G2)を用いて、厚さ約2mmに形成した粘着剤層を同試験機の測定部である直径8mmの平行円盤の間に試験片を挟み込み、周波数1Hzで−50℃から150℃までの貯蔵弾性率(G’)と損失弾性率(G”)を測定する。 The loss tangent (tan δ) at a frequency of 1 Hz is obtained from the equation of tan δ = G ″ / G ′ from the storage elastic modulus (G ′) and loss elastic modulus (G ″) obtained by dynamic viscoelasticity measurement by temperature dispersion. It is done. In the measurement of dynamic viscoelasticity, the pressure-sensitive adhesive layer formed to a thickness of about 2 mm was used with a viscoelasticity testing machine (trade name: ARES G2 manufactured by T.A. Instruments Japan). A test piece is sandwiched between parallel disks having a diameter of 8 mm, which is a measuring part, and a storage elastic modulus (G ′) and a loss elastic modulus (G ″) from −50 ° C. to 150 ° C. are measured at a frequency of 1 Hz.
前記粘着剤層の厚さは、所望の180°引き剥がし接着力を備え、その結果、被着体との密着性をより一層向上させるうえで5μm〜100μmの範囲であることが好ましく、10μm〜80μmの範囲であることがより好ましく、15μm〜80μmの範囲であることがさらに好ましい。 The pressure-sensitive adhesive layer has a desired 180 ° peeling adhesive strength, and as a result, it is preferably in the range of 5 μm to 100 μm in order to further improve the adhesion with the adherend. The range of 80 μm is more preferable, and the range of 15 μm to 80 μm is more preferable.
[両面粘着テープ]
本発明の両面粘着テープは、例えば、発泡体基材に直接、または、発泡体基材上に積層された他の層の表面に、粘着剤を塗布して乾燥させる直写法、剥離シートに粘着剤を塗布して乾燥させた後、発泡体基材や他の層表面に貼り合せる転写法によって製造することができる。[Double-sided adhesive tape]
The double-sided pressure-sensitive adhesive tape of the present invention is, for example, a direct copy method in which an adhesive is applied and dried directly on a foam base material or on the surface of another layer laminated on the foam base material, and sticks to a release sheet. After the agent is applied and dried, it can be produced by a transfer method in which it is bonded to the surface of the foam substrate or other layer.
前記粘着剤組成物として架橋剤を含有するものを使用する場合、前記架橋反応を進行させるうえで、両面粘着テープを好ましくは20℃〜50℃、より好ましくは23℃〜45℃の環境下で2〜7日間の熟成させることが、所望の180°引き剥がし接着力を備え、かつ、発泡体基材と粘着剤層との密着性をより一層向上できる。 When using what contains a crosslinking agent as said adhesive composition, when advancing the said crosslinking reaction, Preferably a double-sided adhesive tape is 20 degreeC-50 degreeC, More preferably, it is an environment of 23 degreeC-45 degreeC. Aging for 2 to 7 days can provide the desired 180 ° peel-off adhesive force and can further improve the adhesion between the foam substrate and the pressure-sensitive adhesive layer.
前記剥離シートとしては、特に限定されないが、ポリエチレン、ポリプロピレン、ポリエステルフィルムなどの合成樹脂フィルム、紙、不織布、布、発泡シートや金属箔、およびこれらのラミネート体などの基材の少なくとも片面に、粘着剤からの剥離性を高めるためのシリコーン系処理、長鎖アルキル系処理、フッ素系処理などの剥離処理が施されたものを使用することができる。 The release sheet is not particularly limited, but is adhered to at least one surface of a base material such as a synthetic resin film such as polyethylene, polypropylene, or polyester film, paper, nonwoven fabric, cloth, foam sheet or metal foil, and a laminate thereof. A material that has been subjected to a release treatment such as a silicone treatment, a long-chain alkyl treatment, or a fluorine treatment for improving the releasability from the agent can be used.
なかでも、前記剥離シートとしては、厚さ10〜40μmのポリエチレンを両側にラミネートした上質紙、ポリエステルフィルムの基材の片面または両面に、シリコーン系剥離処理を施されたもの等を使用することが好ましい。 Among them, as the release sheet, it is possible to use a high-quality paper obtained by laminating polyethylene having a thickness of 10 to 40 μm on both sides, a polyester film base material which has been subjected to silicone release treatment on one side or both sides, and the like. preferable.
本発明の粘着テープの実施形態としては、発泡体基材を中芯とし、発泡体基材の少なくとも一面、好ましくは両面に粘着剤層が設けられた構成を基本構成とする。発泡体基材と粘着剤層とは、直接積層されていても、他の層を介して積層されていてもよい。 As an embodiment of the pressure-sensitive adhesive tape of the present invention, a basic structure is a structure in which a foam base material is used as a core and an adhesive layer is provided on at least one surface, preferably both surfaces of the foam base material. The foam substrate and the pressure-sensitive adhesive layer may be directly laminated or may be laminated via another layer.
前記粘着テープは、前記発泡体基材及び粘着剤層以外に、必要に応じて他の層を有していてもよい。前記他の層としては、寸法安定性や引張強さやリワーク適性を備えた粘着テープを得る場合には、ポリエステルフィルムなどのラミネート層が挙げられる。また、前記他の層としては、遮光性または光反射性を備えた粘着テープを得る場合には印刷層、電磁波シールド特性や面方向の熱伝導性を備えた粘着テープを得る場合には、金属箔や金属メッシュ導電性の金属をメッキした不織布からなる層を有していてもよい。 The said adhesive tape may have another layer as needed other than the said foam base material and an adhesive layer. As said other layer, when obtaining the adhesive tape provided with dimensional stability, tensile strength, and rework suitability, laminate layers, such as a polyester film, are mentioned. In addition, as the other layer, when obtaining a pressure-sensitive adhesive tape having a light-shielding property or a light-reflecting property, a printed layer, and when obtaining a pressure-sensitive adhesive tape having electromagnetic wave shielding characteristics or thermal conductivity in the surface direction, a metal You may have the layer which consists of a nonwoven fabric plated with foil or a metal mesh electroconductive metal.
ラミネート層としては、ポリエチレンテレフタレートなどのポリエステルフィルム、ポリエチレンフィルム、ポリプロピレンフィルム等のフィルムを使用することができる。 As the laminate layer, a film such as a polyester film such as polyethylene terephthalate, a polyethylene film, or a polypropylene film can be used.
前記ラミネート層の厚さは、特に規定されないが、発泡体基材に対する良好な追従性を確保するうえで、1μm〜25μmの範囲であることが好ましく、2μm〜12μmの範囲であることがより好ましい。発泡体基材とラミネート層とを接着する場合、従来公知の粘着剤やドライラミネート用の接着剤を使用することができる。 The thickness of the laminate layer is not particularly specified, but is preferably in the range of 1 μm to 25 μm and more preferably in the range of 2 μm to 12 μm in order to ensure good followability to the foam substrate. . When bonding a foam base material and a laminate layer, a conventionally known pressure-sensitive adhesive or an adhesive for dry lamination can be used.
遮光層としては、顔料等の着色剤を含有するインキによって印刷された層が挙げられ、黒インキを用いて印刷された層を好ましく使用することができる。 Examples of the light shielding layer include a layer printed with an ink containing a colorant such as a pigment, and a layer printed with black ink can be preferably used.
前記反射層としては、顔料等の着色剤を含有するインキによって印刷された層が挙げられ、白色インキを用いて印刷された層を好ましく使用することができる。 Examples of the reflective layer include a layer printed with an ink containing a colorant such as a pigment, and a layer printed with a white ink can be preferably used.
前記遮光層や反射層の厚さは、2μm〜20μmであることが好ましく、4μm〜6μmであることが、前記インキの硬化収縮に起因した粘着テープのカール発生を抑制することができるため好ましい。 The thickness of the light-shielding layer and the reflective layer is preferably 2 μm to 20 μm, and preferably 4 μm to 6 μm because curling of the adhesive tape due to curing shrinkage of the ink can be suppressed.
前記方法で得られた本発明の両面粘着テープの総厚さは、使用する態様によって適宜調整すればよいが、300μm以下であることが好ましく、80μm〜300μmであることがより好ましく、100μm〜300μmであることが、薄型で、かつ、優れた耐衝撃性と解体性とを両立でき、小型電子端末の薄型化に貢献できるためさらに好ましい。 The total thickness of the double-sided pressure-sensitive adhesive tape of the present invention obtained by the above method may be appropriately adjusted depending on the mode of use, but is preferably 300 μm or less, more preferably 80 μm to 300 μm, and more preferably 100 μm to 300 μm. It is more preferable because it is thin and can have both excellent impact resistance and dismantling properties and contribute to the thinning of a small electronic terminal.
本発明の粘着テープは、上記構成により好適な耐衝撃性と解体性とを有することから、小型電子機器の部品、例えば、小型電子機器の情報表示部の保護パネルや画像表示モジュール、薄型電池、スピーカー、レシーバー、圧電素子、プリント基板、フレキシブルプリント基板(FPC)、デジタルカメラモジュール、センサー類、その他のモジュールや、ポリウレタンやポリオレフィン系などのクッション材ゴム製部材、加飾用部品や各種部材の固定などに好適に適用できる。特に小型電子機器の情報表示部の保護パネルや画像表示モジュール、薄型電池等の薄型の板状剛体部品の固定用途に好適に適用できる。 The pressure-sensitive adhesive tape of the present invention has suitable impact resistance and dismantling properties according to the above-described configuration, so that it is a component of a small electronic device, for example, a protection panel or an image display module for an information display unit of a small electronic device, Fixing speakers, receivers, piezoelectric elements, printed circuit boards, flexible printed circuit boards (FPCs), digital camera modules, sensors, other modules, cushioning rubber members such as polyurethane and polyolefin, decorative parts and various members It can be suitably applied to. In particular, the present invention can be suitably applied to fixing a thin plate-like rigid part such as a protection panel, an image display module, or a thin battery for an information display unit of a small electronic device.
(粘着剤組成物(A)の調製)
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n−ブチルアクリレート97.97質量部、アクリル酸2.0質量部、4−ヒドロキブチルアクリレート0.03質量部、重合開始剤として2、2’−アゾビスイソブチロニトリル0.1質量部を、酢酸エチル100質量部に溶解し、70℃で12時間重合させることによって、重量平均分子量が200万(ポリスチレン換算)のアクリル系重合体の酢酸エチル溶液を得た。(Preparation of pressure-sensitive adhesive composition (A))
In a reaction vessel equipped with a stirrer, reflux condenser, thermometer, dropping funnel and nitrogen gas inlet, 97.97 parts by mass of n-butyl acrylate, 2.0 parts by mass of acrylic acid, 0.03 mass of 4-hydroxybutyl acrylate Part by weight, 0.1 part by mass of 2,2′-azobisisobutyronitrile as a polymerization initiator was dissolved in 100 parts by mass of ethyl acetate and polymerized at 70 ° C. for 12 hours, whereby the weight average molecular weight was 2 million ( An ethyl acetate solution of an acrylic polymer (in terms of polystyrene) was obtained.
次に、前記アクリル系重合体100質量部に対し、「スーパーエステルA100」(荒川化学工業株式会社製、不均化ロジンのグリセリンエステル)25質量部と、「ペンセルD135」(荒川化学工業株式会社製、重合ロジンのペンタエリスリトールエステル)5質量部と、「FTR6100」(三井化学株式会社製、スチレン系石油樹脂)20質量部とを添加し、さらに酢酸エチルを加えて均一に混合することによって、不揮発分40質量%の粘着剤組成物(a)を得た。 Next, 25 parts by mass of “Superester A100” (produced by Arakawa Chemical Industries, Ltd., glycerin ester of disproportionated rosin) and “Pencel D135” (Arakawa Chemical Industries, Ltd.) with respect to 100 parts by mass of the acrylic polymer. By adding 5 parts by mass of pentaerythritol ester of polymerized rosin and 20 parts by mass of “FTR6100” (made by Mitsui Chemicals, styrene petroleum resin), and further adding ethyl acetate and mixing uniformly, A pressure-sensitive adhesive composition (a) having a nonvolatile content of 40% by mass was obtained.
次に、前記粘着剤組成物(a)100質量部と、「コロネートL−45」(日本ポリウレタン工業株式会社製、イソシアネート系架橋剤、不揮発分45質量%)1.3質量部とを混合し、15分攪拌することによって粘着剤組成物(A)を得た。前記粘着剤組成物(A)の180°引き剥がし接着力は、12N/20mmであった。前記180°引き剥がし接着力は、後述する方法で測定した値である。 Next, 100 parts by mass of the pressure-sensitive adhesive composition (a) and 1.3 parts by mass of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, non-volatile content 45% by mass) are mixed. The mixture was stirred for 15 minutes to obtain a pressure-sensitive adhesive composition (A). The adhesive composition (A) had a 180 ° peel adhesion of 12 N / 20 mm. The 180 ° peel adhesion is a value measured by the method described later.
[粘着剤層の180°引き剥がし接着力]
厚さ25μmのポリエチレンテレフタレート基材に、乾燥後の粘着剤層の厚さが25μmとなるように前記粘着剤組成物(A)を塗工し、80℃で3分乾燥した後、40℃の環境下で48時間熟成することによって粘着テープを得た。[Adhesive strength of adhesive layer by 180 ° peeling]
The pressure-sensitive adhesive composition (A) was applied to a polyethylene terephthalate substrate having a thickness of 25 μm so that the thickness of the pressure-sensitive adhesive layer after drying was 25 μm, dried at 80 ° C. for 3 minutes, and then heated to 40 ° C. An adhesive tape was obtained by aging in an environment for 48 hours.
前記粘着テープを、温度23℃及び相対湿度65%RHの環境下で、アルミニウム板に貼付し、前記粘着テープの上面(ポリエチレンテレフタレート基材側の面)を、2kgローラーを使用し一往復させることでそれらを圧着した。 The adhesive tape is affixed to an aluminum plate in an environment of a temperature of 23 ° C. and a relative humidity of 65% RH, and the upper surface of the adhesive tape (the surface on the polyethylene terephthalate substrate side) is reciprocated once using a 2 kg roller. Crimped them with.
前記方法で圧着したものを、温度23℃及び相対湿度50%RHの環境下に1時間静置した後、剥離速度300mm/minにおける180°引き剥がした時の強度を測定した。後述する粘着剤組成物(B)〜(D)を用いて形成された粘着剤層の180°引き剥がし接着力もまた、上記と同様の方法で測定した。 The material pressure-bonded by the above method was allowed to stand for 1 hour in an environment of a temperature of 23 ° C. and a relative humidity of 50% RH, and then the strength when peeled by 180 ° at a peeling speed of 300 mm / min was measured. The 180 ° peel adhesive strength of the pressure-sensitive adhesive layer formed using the pressure-sensitive adhesive compositions (B) to (D) described later was also measured by the same method as described above.
(粘着剤組成物(B)の調製)
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n−ブチルアクリレート93.4質量部、アクリル酸3.5質量部、酢酸ビニル3質量部、2−ヒドロキシエチルアクリレート0.1質量部、重合開始剤として2、2’−アゾビスイソブチロニトリル0.1質量部を、酢酸エチル100質量部に溶解し、70℃で12時間重合させることによって、重量平均分子量が160万(ポリスチレン換算)のアクリル系重合体の酢酸エチル溶液を得た。(Preparation of pressure-sensitive adhesive composition (B))
In a reaction vessel equipped with a stirrer, reflux condenser, thermometer, dropping funnel and nitrogen gas inlet, 93.4 parts by mass of n-butyl acrylate, 3.5 parts by mass of acrylic acid, 3 parts by mass of vinyl acetate, 2-hydroxy By dissolving 0.1 part by weight of ethyl acrylate and 0.1 part by weight of 2,2′-azobisisobutyronitrile as a polymerization initiator in 100 parts by weight of ethyl acetate and polymerizing at 70 ° C. for 12 hours, An ethyl acetate solution of an acrylic polymer having an average molecular weight of 1,600,000 (polystyrene conversion) was obtained.
次に、前記アクリル系重合体100質量部に対し、「スーパーエステルA100」(荒川化学工業株式会社製、不均化ロジンのグリセリンエステル)30質量部と、「ペンセルD135」(荒川化学工業株式会社製、重合ロジンのペンタエリスリトールエステル)5質量部と、「FTR6100」(三井化学株式会社製、スチレン系石油樹脂)25質量部とを混合し、さらに酢酸エチルを加え均一に混合することによって、不揮発分38質量%の粘着剤組成物(b)を得た。 Next, with respect to 100 parts by mass of the acrylic polymer, 30 parts by mass of “Superester A100” (produced by Arakawa Chemical Industries, Ltd., glycerin ester of disproportionated rosin) and “Pencel D135” (Arakawa Chemical Industries, Ltd.) 5 parts by mass of polymerized rosin pentaerythritol ester) and 25 parts by mass of “FTR6100” (manufactured by Mitsui Chemicals, styrene-based petroleum resin), and further mixed with ethyl acetate to make it non-volatile A pressure-sensitive adhesive composition (b) having a content of 38% by mass was obtained.
次に、前記粘着剤組成物(b)100質量部と、「コロネートL−45」(日本ポリウレタン工業株式会社製、イソシアネート系架橋剤、不揮発分45質量%)1.3質量部とを混合し、15分攪拌することによって粘着剤組成物(B)を得た。前記粘着剤組成物(B)の180°引き剥がし接着力は、13.7N/20mmであった。 Next, 100 parts by mass of the pressure-sensitive adhesive composition (b) and 1.3 parts by mass of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, nonvolatile content 45% by mass) are mixed. The mixture was stirred for 15 minutes to obtain a pressure-sensitive adhesive composition (B). The adhesive composition (B) had a 180 ° peel adhesion of 13.7 N / 20 mm.
(粘着剤組成物(C)の調製)
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n−ブチルアクリレート93.4質量部、アクリル酸3.5質量部、酢酸ビニル3質量部、2−ヒドロキシエチルアクリレート0.1質量部、重合開始剤として2、2’−アゾビスイソブチロニトリル0.1質量部を、酢酸エチル100質量部に溶解し、70℃で12時間重合させることによって、重量平均分子量が160万(ポリスチレン換算)のアクリル系重合体の酢酸エチル溶液を得た。(Preparation of pressure-sensitive adhesive composition (C))
In a reaction vessel equipped with a stirrer, reflux condenser, thermometer, dropping funnel and nitrogen gas inlet, 93.4 parts by mass of n-butyl acrylate, 3.5 parts by mass of acrylic acid, 3 parts by mass of vinyl acetate, 2-hydroxy By dissolving 0.1 part by weight of ethyl acrylate and 0.1 part by weight of 2,2′-azobisisobutyronitrile as a polymerization initiator in 100 parts by weight of ethyl acetate and polymerizing at 70 ° C. for 12 hours, An ethyl acetate solution of an acrylic polymer having an average molecular weight of 1,600,000 (polystyrene conversion) was obtained.
次に、前記アクリル系重合体100質量部に対し、「スーパーエステルA100」(荒川化学工業株式会社製、不均化ロジンのグリセリンエステル)20質量部と、「FTR6100」(三井化学株式会社製、スチレン系石油樹脂)20質量部と、「ハリタックPCJ」(ハリマ化成グループ株式会社製、重合ロジンのペンタエリスリトールエステル)10質量部とを添加し、さらに酢酸エチルを加え均一に混合することによって、不揮発分38質量%の粘着剤組成物(c)を得た。 Next, with respect to 100 parts by mass of the acrylic polymer, 20 parts by mass of “Superester A100” (produced by Arakawa Chemical Industries, Ltd., glycerin ester of disproportionated rosin) and “FTR6100” (produced by Mitsui Chemicals, Inc., By adding 20 parts by mass of styrene-based petroleum resin) and 10 parts by mass of “Halitak PCJ” (produced by Harima Chemical Group Co., Ltd., polymerized rosin pentaerythritol ester), ethyl acetate is added and mixed uniformly. A pressure-sensitive adhesive composition (c) having a content of 38% by mass was obtained.
前記粘着剤組成物(c)100質量部と、「コロネートL−45」(日本ポリウレタン工業株式会社製、イソシアネート系架橋剤、不揮発分45質量%)1.3質量部とを混合し、15分攪拌することによって粘着剤組成物(C)を得た。前記粘着剤組成物(C)の180°引き剥がし接着力は、12.8N/20mmであった。 100 parts by mass of the pressure-sensitive adhesive composition (c) and 1.3 parts by mass of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based cross-linking agent, nonvolatile content 45% by mass) are mixed for 15 minutes. The pressure-sensitive adhesive composition (C) was obtained by stirring. The adhesive composition (C) had a 180 ° peel-off adhesive strength of 12.8 N / 20 mm.
(粘着剤組成物(D)の調製)
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n−ブチルアクリレート44.94質量部、2−エチルヘキシルアクリレート50質量部、酢酸ビニル3質量部、アクリル酸2質量部、4−ヒドロキシブチルアクリレート0.06質量部、重合開始剤として2、2’−アゾビスイソブチロニトリル0.1質量部を、酢酸エチル100質量部に溶解し、70℃で12時間重合させることによって、重量平均分子量が120万(ポリスチレン換算)のアクリル系重合体の酢酸エチル溶液を得た。(Preparation of pressure-sensitive adhesive composition (D))
In a reaction vessel equipped with a stirrer, reflux condenser, thermometer, dropping funnel and nitrogen gas inlet, 44.94 parts by mass of n-butyl acrylate, 50 parts by mass of 2-ethylhexyl acrylate, 3 parts by mass of vinyl acetate,
次に、前記アクリル系重合体100質量部に対し、「スーパーエステルA100」(荒川化学工業株式会社製、不均化ロジンのグリセリンエステル)30質量部と、「FTR6100」(三井化学株式会社製、スチレン系石油樹脂)25質量部と、「ペンセルD135」(荒川化学工業株式会社製、重合ロジンのペンタエリスリトールエステル)5質量部とを添加し、さらに酢酸エチルを加え均一に混合することによって、不揮発分45質量%の粘着剤組成物(d)を得た。 Next, with respect to 100 parts by mass of the acrylic polymer, 30 parts by mass of “Superester A100” (Arakawa Chemical Industries, Ltd., glycerin ester of disproportionated rosin) and “FTR6100” (Mitsui Chemicals, By adding 25 parts by mass of styrene-based petroleum resin) and 5 parts by mass of “Pencel D135” (produced by Arakawa Chemical Industries, Ltd., pentaerythritol ester of polymerized rosin), ethyl acetate is added and mixed uniformly. A pressure-sensitive adhesive composition (d) having a content of 45% by mass was obtained.
前記粘着剤組成物(d)100質量部と、「コロネートL−45」(日本ポリウレタン工業株式会社製、イソシアネート系架橋剤、不揮発分45質量%)1.3質量部とを混合し、15分攪拌することによって粘着剤組成物(D)を得た。前記粘着剤組成物(D)の180°引き剥がし接着力は、13.2N/20mmであった。 100 parts by mass of the pressure-sensitive adhesive composition (d) and 1.3 parts by mass of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, 45% by mass of non-volatile content) were mixed for 15 minutes. The pressure-sensitive adhesive composition (D) was obtained by stirring. The adhesive composition (D) had a 180 ° peel adhesion of 13.2 N / 20 mm.
(粘着剤組成物(E)の調製)
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n−ブチルアクリレート63.4質量部、2−エチルヘキシルアクリレート30質量部、アクリル酸3質量部、酢酸ビニル3.5質量部、2−ヒドロキシエチルアクリレート0.1質量部、重合開始剤として2、2’−アゾビスイソブチロニトリル0.1質量部を、酢酸エチル100質量部に溶解し、70℃で12時間重合させることによって、重量平均分子量が140万(ポリスチレン換算)のアクリル系重合体の酢酸エチル溶液を得た。(Preparation of pressure-sensitive adhesive composition (E))
In a reaction vessel equipped with a stirrer, reflux condenser, thermometer, dropping funnel and nitrogen gas inlet, 63.4 parts by mass of n-butyl acrylate, 30 parts by mass of 2-ethylhexyl acrylate, 3 parts by mass of acrylic acid, 3 vinyl acetate 0.5 part by mass, 0.1 part by mass of 2-hydroxyethyl acrylate, 0.1 part by mass of 2,2′-azobisisobutyronitrile as a polymerization initiator were dissolved in 100 parts by mass of ethyl acetate, and 70 ° C. By polymerizing for 12 hours, an ethyl acetate solution of an acrylic polymer having a weight average molecular weight of 1.4 million (in terms of polystyrene) was obtained.
次に、前記アクリル系重合体100質量部に対し、「スーパーエステルA100」(荒川化学工業株式会社製、不均化ロジンのグリセリンエステル)30質量部と、「FTR6100」(三井化学株式会社製、スチレン系石油樹脂)25質量部と、「ペンセルD135」(荒川化学工業株式会社製、重合ロジンのペンタエリスリトールエステル)5質量部とを添加し、さらに酢酸エチルを加え均一に混合することによって、不揮発分38質量%の粘着剤組成物(e)を得た。 Next, with respect to 100 parts by mass of the acrylic polymer, 30 parts by mass of “Superester A100” (Arakawa Chemical Industries, Ltd., glycerin ester of disproportionated rosin) and “FTR6100” (Mitsui Chemicals, By adding 25 parts by mass of styrene-based petroleum resin) and 5 parts by mass of “Pencel D135” (produced by Arakawa Chemical Industries, Ltd., pentaerythritol ester of polymerized rosin), ethyl acetate is added and mixed uniformly. A pressure-sensitive adhesive composition (e) having a content of 38% by mass was obtained.
前記粘着剤組成物(e)100質量部と、「コロネートL−45」(日本ポリウレタン工業株式会社製、イソシアネート系架橋剤、不揮発分45質量%)1.3質量部とを混合し、15分攪拌することによって粘着剤組成物(E)を得た。前記粘着剤組成物(E)の180°引き剥がし接着力は、12.3N/20mmであった。 100 parts by mass of the pressure-sensitive adhesive composition (e) and 1.3 parts by mass of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, non-volatile content: 45% by mass) are mixed for 15 minutes. The pressure-sensitive adhesive composition (E) was obtained by stirring. The adhesive composition (E) had a 180 ° peel-off adhesive strength of 12.3 N / 20 mm.
(粘着剤組成物(F)の調製)
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n−ブチルアクリレート44.94質量部、2−エチルヘキシルアクリレート50質量部、酢酸ビニル3質量部、アクリル酸2質量部、4−ヒドロキシブチルアクリレート0.06質量部、重合開始剤として2、2’−アゾビスイソブチロニトリル0.1質量部を、酢酸エチル100質量部に溶解し、70℃で12時間重合させることによって、重量平均分子量が120万(ポリスチレン換算)のアクリル系重合体の酢酸エチル溶液を得た。(Preparation of pressure-sensitive adhesive composition (F))
In a reaction vessel equipped with a stirrer, reflux condenser, thermometer, dropping funnel and nitrogen gas inlet, 44.94 parts by mass of n-butyl acrylate, 50 parts by mass of 2-ethylhexyl acrylate, 3 parts by mass of vinyl acetate,
次に、アクリル系重合体100質量部に対し、「ペンセルD135」(荒川化学工業株式会社製、重合ロジンのペンタエリスリトールエステル)10質量部を添加し、さらに酢酸エチルを加え均一に混合することによって、不揮発分45質量%の粘着剤組成物(f)を得た。 Next, 10 parts by weight of “Pencel D135” (Arakawa Chemical Industries, Ltd., pentaerythritol ester of polymerized rosin) is added to 100 parts by weight of the acrylic polymer, and ethyl acetate is further added and mixed uniformly. A pressure-sensitive adhesive composition (f) having a nonvolatile content of 45% by mass was obtained.
前記粘着剤組成物(f)100質量部と、「コロネートL−45」(日本ポリウレタン工業株式会社製、イソシアネート系架橋剤、不揮発分45質量%)0.9質量部とを混合し、15分攪拌することによって粘着剤組成物(F)を得た。前記粘着剤組成物(F)の180°引き剥がし接着力は、8.5N/20mmであった。 100 parts by mass of the pressure-sensitive adhesive composition (f) and 0.9 parts by mass of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based cross-linking agent, non-volatile content: 45% by mass) are mixed for 15 minutes. The pressure-sensitive adhesive composition (F) was obtained by stirring. The adhesive composition (F) had a 180 ° peel adhesion of 8.5 N / 20 mm.
(粘着剤組成物(G)の調製)
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n−ブチルアクリレート93.4質量部、アクリル酸3.5質量部、酢酸ビニル3質量部、2−ヒドロキシエチルアクリレート0.1質量部、重合開始剤として2、2’−アゾビスイソブチロニトリル0.1質量部を、酢酸エチル100質量部に溶解し、70℃で12時間重合させることによって、重量平均分子量が160万(ポリスチレン換算)のアクリル系重合体の酢酸エチル溶液を得た。(Preparation of pressure-sensitive adhesive composition (G))
In a reaction vessel equipped with a stirrer, reflux condenser, thermometer, dropping funnel and nitrogen gas inlet, 93.4 parts by mass of n-butyl acrylate, 3.5 parts by mass of acrylic acid, 3 parts by mass of vinyl acetate, 2-hydroxy By dissolving 0.1 part by weight of ethyl acrylate and 0.1 part by weight of 2,2′-azobisisobutyronitrile as a polymerization initiator in 100 parts by weight of ethyl acetate and polymerizing at 70 ° C. for 12 hours, An ethyl acetate solution of an acrylic polymer having an average molecular weight of 1,600,000 (polystyrene conversion) was obtained.
次に、前記アクリル系重合体100質量部に対し、「スーパーエステルA100」(荒川化学工業株式会社製、不均化ロジンのグリセリンエステル)9.4質量部と、「ハリタックPCJ」(ハリマ化成グループ株式会社製、重合ロジンのペンタエリスリトールエステル)9.4質量部とを添加し、さらに酢酸エチルを加え均一に混合することによって、不揮発分38質量%の粘着剤組成物(g)を得た。 Next, with respect to 100 parts by mass of the acrylic polymer, 9.4 parts by mass of “Superester A100” (produced by Arakawa Chemical Industries, Ltd., glycerin ester of disproportionated rosin) and “Halitak PCJ” (Harima Chemical Group) 9.4 parts by mass of pentaerythritol ester of polymerized rosin (manufactured by Co., Ltd.) was added, and ethyl acetate was further added and mixed uniformly to obtain an adhesive composition (g) having a nonvolatile content of 38% by mass.
前記粘着剤組成物(g)100質量部と、「コロネートL−45」(日本ポリウレタン工業株式会社製、イソシアネート系架橋剤、不揮発分45質量%)1.1質量部とを混合し、15分攪拌することによって粘着剤組成物(G)を得た。前記粘着剤組成物(G)の180°引き剥がし接着力は、8.9N/20mmであった。 100 parts by mass of the pressure-sensitive adhesive composition (g) and 1.1 parts by mass of “Coronate L-45” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, non-volatile content: 45% by mass) were mixed for 15 minutes. The pressure-sensitive adhesive composition (G) was obtained by stirring. The adhesive composition (G) had a 180 ° peel adhesion of 8.9 N / 20 mm.
(実施例1)
前記粘着剤組成物(A)を厚さ75μmのポリエチレンテレフタレートフィルム(PETフィルム)の剥離処理面に、乾燥後の厚さが25μmとなるように塗工し、80℃で3分間乾燥させることによって粘着剤層を形成した。前記粘着剤層のゲル分率は42.5質量%であった。Example 1
By applying the pressure-sensitive adhesive composition (A) to a release-treated surface of a 75 μm-thick polyethylene terephthalate film (PET film) so that the thickness after drying is 25 μm, and drying at 80 ° C. for 3 minutes. An adhesive layer was formed. The gel fraction of the pressure-sensitive adhesive layer was 42.5% by mass.
次に、黒色ポリオレフィン系発泡体(1)(厚さ100μm、密度0.40g/cm3、層間強度12.6N/cm、25%圧縮強度:103kPa、流れ方向の引張強さ:1084N/cm2、幅方向の引張強さ:790N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)からなる基材の両面に、前記粘着剤層を1枚ずつ貼り合わせたのち、23℃下、線圧5kg/cmのロールで圧着させることによってそれらをラミネートし、40℃で48時間熟成させることによって、厚さ150μmの両面粘着テープを得た。Next, black polyolefin-based foam (1) (thickness 100 μm, density 0.40 g / cm 3 , interlayer strength 12.6 N / cm, 25% compression strength: 103 kPa, tensile strength in the flow direction: 1084 N / cm 2 The pressure-sensitive adhesive is applied to both sides of a base material made of Sekisui Chemical Co., Ltd. foam surface having a wetting index of 54 mN / m by tensile strength in the width direction: 790 N / cm 2 . After laminating the layers one by one, laminating them by pressing with a roll with a linear pressure of 5 kg / cm at 23 ° C., and aging at 40 ° C. for 48 hours, a double-sided adhesive tape with a thickness of 150 μm was obtained. It was.
(実施例2)
粘着剤層の乾燥後の厚さを25μmから15μmに変更したこと以外は、実施例1と同様の方法で厚さ130μmの両面粘着テープを得た。(Example 2)
A double-sided pressure-sensitive adhesive tape having a thickness of 130 μm was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer after drying was changed from 25 μm to 15 μm.
(実施例3)
粘着剤層の乾燥後の厚さを25μmから50μmに変更したこと以外は、実施例1と同様の方法で厚さ200μmの両面粘着テープを得た。(Example 3)
A double-sided pressure-sensitive adhesive tape having a thickness of 200 μm was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer after drying was changed from 25 μm to 50 μm.
(実施例4)
黒色ポリオレフィン系発泡体(1)の代わりに、黒色ポリオレフィン系発泡体(2)(厚さ:80μm、密度0.40g/cm3、層間強度10.2N/cm、25%圧縮強度:92kPa、流れ方向の引張強さ:1062N/cm2、幅方向の引張強さ:962N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いること、及び、粘着剤層の乾燥後の厚さを25μmから15μmに変更したこと以外は、実施例1と同様の方法で厚さ110μmの両面粘着テープを得た。Example 4
Instead of the black polyolefin foam (1), the black polyolefin foam (2) (thickness: 80 μm, density 0.40 g / cm 3 , interlayer strength 10.2 N / cm, 25% compression strength: 92 kPa, flow The tensile strength in the direction: 1062 N / cm 2 , the tensile strength in the width direction: 962 N / cm 2 , and the surface of the foam made by Sekisui Chemical Co., Ltd. was subjected to corona treatment to a wetting index of 54 mN / m) A double-sided pressure-sensitive adhesive tape having a thickness of 110 μm was obtained in the same manner as in Example 1 except that the thickness after drying of the pressure-sensitive adhesive layer was changed from 25 μm to 15 μm.
(実施例5)
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(3)(厚さ:100μm、密度0.45g/cm3、層間強度16.2N/cm、25%圧縮強度:190kPa、流れ方向の引張強さ:964N/cm2、幅方向の引張強さ:861N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例1と同様の方法で、厚さ150μmの両面粘着テープを得た。(Example 5)
Black polyolefin foam (3) instead of black polyolefin foam (1) (thickness: 100 μm, density 0.45 g / cm 3 , interlayer strength 16.2 N / cm, 25% compressive strength: 190 kPa, flow direction The surface of the foam made by Sekisui Chemical Co., Ltd. having a tensile strength of 964 N / cm 2 and a width direction tensile strength of 861 N / cm 2 is obtained by corona treatment with a wetting index of 54 mN / m) A double-sided pressure-sensitive adhesive tape having a thickness of 150 μm was obtained in the same manner as in Example 1 except that it was not.
(実施例6)
粘着剤層の乾燥後の厚さを15μmから50μmに変更したこと以外は、実施例5と同様の方法で厚さ200μmの両面粘着テープを得た。(Example 6)
A double-sided pressure-sensitive adhesive tape having a thickness of 200 μm was obtained in the same manner as in Example 5 except that the thickness of the pressure-sensitive adhesive layer after drying was changed from 15 μm to 50 μm.
(実施例7)
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(4)(厚さ:140μm、密度0.40g/cm3、層間強度19.1N/cm、25%圧縮強度:130kPa、流れ方向の引張強さ:994N/cm2、幅方向の引張強さ:713N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いること、及び、粘着剤層の乾燥後の厚さを15μmから30μmにしたこと以外は、実施例1と同様の方法で厚さ200μmの両面粘着テープを得た。(Example 7)
Black polyolefin foam (4) instead of black polyolefin foam (1) (thickness: 140 μm, density 0.40 g / cm 3 , interlayer strength 19.1 N / cm, 25% compressive strength: 130 kPa, flow direction The surface of the foam made by Sekisui Chemical Co., Ltd. with a tensile strength of 994 N / cm 2 and a width direction tensile strength of 713 N / cm 2 was used to obtain a wet index of 54 mN / m by corona treatment. A double-sided pressure-sensitive adhesive tape having a thickness of 200 μm was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer after drying was changed from 15 μm to 30 μm.
(実施例8)
粘着剤層の乾燥後の厚さを30μmから55μmに変更したこと以外は、実施例7と同様の方法で厚さ250μmの両面粘着テープを得た。(Example 8)
A double-sided pressure-sensitive adhesive tape having a thickness of 250 μm was obtained in the same manner as in Example 7, except that the thickness of the pressure-sensitive adhesive layer after drying was changed from 30 μm to 55 μm.
(実施例9)
粘着剤層の乾燥後の厚さを30μmから80μmに変更したこと以外は、実施例7と同様の方法で厚さ300μmの両面粘着テープを得た。Example 9
A double-sided pressure-sensitive adhesive tape having a thickness of 300 μm was obtained in the same manner as in Example 7, except that the thickness of the pressure-sensitive adhesive layer after drying was changed from 30 μm to 80 μm.
(実施例10)
前記粘着剤組成物(A)の代わりに、前記粘着剤組成物(B)を使用すること以外は、実施例1と同様の方法で厚さ150μmの両面粘着テープを得た(粘着剤層のゲル分率40質量%)。(Example 10)
A double-sided pressure-sensitive adhesive tape having a thickness of 150 μm was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive composition (B) was used instead of the pressure-sensitive adhesive composition (A) (the pressure-sensitive adhesive layer). Gel fraction 40% by mass).
(実施例11)
前記粘着剤組成物(A)の代わりに、前記粘着剤組成物(C)を使用すること以外は、実施例1と同様の方法で厚さ150μmの両面粘着テープを得た(粘着剤層のゲル分率43質量%)。(Example 11)
A double-sided pressure-sensitive adhesive tape having a thickness of 150 μm was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive composition (C) was used instead of the pressure-sensitive adhesive composition (A) (the pressure-sensitive adhesive layer). Gel fraction 43% by mass).
(実施例12)
前記粘着剤組成物(A)の代わりに、前記粘着剤組成物(D)を使用すること以外は、実施例1と同様の方法で厚さ150μmの両面粘着テープを得た(粘着剤層のゲル分率25質量%)。(Example 12)
A double-sided pressure-sensitive adhesive tape having a thickness of 150 μm was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive composition (D) was used instead of the pressure-sensitive adhesive composition (A) (the pressure-sensitive adhesive layer). Gel fraction 25% by mass).
(実施例13)
前記粘着剤組成物(A)の代わりに、前記粘着剤組成物(E)を使用すること以外は、実施例1と同様の方法で厚さ150μmの両面粘着テープを得た(粘着剤層のゲル分率39質量%)。(Example 13)
A double-sided pressure-sensitive adhesive tape having a thickness of 150 μm was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive composition (E) was used instead of the pressure-sensitive adhesive composition (A) (the pressure-sensitive adhesive layer). Gel fraction 39% by mass).
(比較例1)
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(5)(厚さ:100μm、密度0.33g/cm3、層間強度8.9N/cm、25%圧縮強度:70kPa、流れ方向の引張強さ:799N/cm2、幅方向の引張強さ:627N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例1と同様の方法で厚さ150μmの両面粘着テープを得た。(Comparative Example 1)
Black polyolefin foam (5) instead of black polyolefin foam (1) (thickness: 100 μm, density 0.33 g / cm 3 , interlayer strength 8.9 N / cm, 25% compressive strength: 70 kPa, flow direction The surface of the foam made by Sekisui Chemical Co., Ltd. having a tensile strength of 799 N / cm 2 and a width direction tensile strength of 627 N / cm 2 is obtained by corona treatment with a wetting index of 54 mN / m. A double-sided pressure-sensitive adhesive tape having a thickness of 150 μm was obtained in the same manner as in Example 1, except that it was not.
(比較例2)
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(6)(厚さ:100μm、密度0.50g/cm3、層間強度13.6N/cm、25%圧縮強度:270kPa、流れ方向の引張強さ:1456N/cm2、幅方向の引張強さ:956N/cm2、である積水化学工業株式会社製の発泡体の表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例1と同様の方法で、厚さ150μmの両面粘着テープを得た。(Comparative Example 2)
Black polyolefin foam (6) instead of black polyolefin foam (1) (thickness: 100 μm, density 0.50 g / cm 3 , interlayer strength 13.6 N / cm, 25% compressive strength: 270 kPa, flow direction The surface of the foam made by Sekisui Chemical Co., Ltd. having a tensile strength of 1456 N / cm 2 and a tensile strength in the width direction of 956 N / cm 2 is obtained by corona treatment with a wetting index of 54 mN / m) A double-sided pressure-sensitive adhesive tape having a thickness of 150 μm was obtained in the same manner as in Example 1 except that it was not.
(比較例3)
粘着剤層の乾燥後の厚さを15μmから50μmに変更したこと以外は、比較例2と同様にして厚さ200μmの両面粘着テープを得た。(Comparative Example 3)
A double-sided pressure-sensitive adhesive tape having a thickness of 200 μm was obtained in the same manner as in Comparative Example 2 except that the thickness of the pressure-sensitive adhesive layer after drying was changed from 15 μm to 50 μm.
(比較例4)
前記粘着剤組成物(A)の代わりに、前記粘着剤組成物(F)を使用すること以外は、実施例1と同様の方法で厚さ150μmの両面粘着テープを得た(粘着剤層のゲル分率38質量%)。(Comparative Example 4)
A double-sided pressure-sensitive adhesive tape having a thickness of 150 μm was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive composition (F) was used instead of the pressure-sensitive adhesive composition (A) (the pressure-sensitive adhesive layer). Gel fraction 38% by mass).
(比較例5)
前記粘着剤組成物(A)の代わりに、前記粘着剤組成物(G)を使用すること以外は、実施例7と同様の方法で厚さ200μmの両面粘着テープを得た(粘着剤層のゲル分率48質量%)。(Comparative Example 5)
A double-sided pressure-sensitive adhesive tape having a thickness of 200 μm was obtained in the same manner as in Example 7 except that the pressure-sensitive adhesive composition (G) was used instead of the pressure-sensitive adhesive composition (A) (the pressure-sensitive adhesive layer). Gel fraction 48% by mass).
上記実施例及び比較例にて使用した発泡体基材、上記実施例及び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。得られた結果を表に示す。 The following evaluation was performed about the foam base material used by the said Example and comparative example, and the double-sided adhesive tape obtained by the said Example and comparative example. The results obtained are shown in the table.
[発泡体基材と粘着テープ厚さ]
発泡体基材の厚さは、尾崎製作所製のダイヤルシクネスゲージG型を用いて測定した。粘着テープの厚さは、剥離フィルムを剥がしたものの厚さを、ダイヤルシクネスゲージG型を用いて測定した。[Foam substrate and adhesive tape thickness]
The thickness of the foam base material was measured using a dial series gauge G type manufactured by Ozaki Seisakusho. The thickness of the pressure-sensitive adhesive tape was measured by using a dial thickness gauge G type after peeling the release film.
[発泡体基材の密度]
発泡体基材の密度は、JISK6767に準じて測定した。具体的には、4cm×5cmの長方形に切断した発泡体基材を15cm3分用意し、その質量を測定して密度を求めた。[Density of foam substrate]
The density of the foam substrate was measured according to JISK6767. Specifically, a foam base material cut into a 4 cm × 5 cm rectangle was prepared for 15 cm 3 minutes, and the mass was measured to determine the density.
[発泡体基材の層間強度]
発泡体基材の両面に、厚さ50μmの強粘着性(下記高速剥離試験時に被着体および発泡体基材から剥離しないもの)の粘着剤層を1枚ずつ貼り合わせたものを、40℃で48時間熟成することによって、層間強度測定用の両面粘着テープを作成した。[Interlayer strength of foam substrate]
40 ° C. obtained by laminating adhesive layers each having a strong adhesiveness of 50 μm in thickness (one that does not peel from the adherend and the foam base during the following high-speed peel test) on both sides of the foam base Was aged for 48 hours to prepare a double-sided pressure-sensitive adhesive tape for measuring interlayer strength.
次に、前記両面粘着テープの片側の粘着面を、厚さ25μmのポリエステルフィルムで裏打ちした後、発泡体基材の幅方向1cm及びその流れ方向15cmの大きさに裁断したものを、23℃及び相対湿度50%RH下、厚さ50μm、幅3cm、長さ20cmのポリエステルフィルムに貼付し、その表面を、2kgローラーを1往復させることで、それらを圧着した後、60℃の環境下に24時間静置し、次いで23℃で1時間静置することによって試験片を得た。 Next, the adhesive surface on one side of the double-sided adhesive tape was lined with a polyester film having a thickness of 25 μm, and then cut into a size of 1 cm in the width direction of the foam base material and 15 cm in the flow direction. Affixed to a polyester film having a relative humidity of 50% RH, a thickness of 50 μm, a width of 3 cm, and a length of 20 cm. The test piece was obtained by leaving still at time and then leaving still at 23 degreeC for 1 hour.
次に、23℃及び相対湿度50%RH下、前記試験片を構成する厚さ50μmmのポリエステルフィルム側を高速剥離試験機の取り付け治具に固定し、前記試験片を構成する厚さ25μmのポリエステルフィルムを引張速度15m/分で90度方向に引っ張ることで、前記試験片を構成する発泡体基材が引き裂かれた際の最大強度を測定した。 Next, under 23 ° C. and relative humidity 50% RH, the polyester film side of 50 μm thickness constituting the test piece is fixed to a mounting jig of a high-speed peel tester, and the 25 μm thick polyester constituting the test piece is fixed. By pulling the film in the direction of 90 degrees at a tensile speed of 15 m / min, the maximum strength when the foam base material constituting the test piece was torn was measured.
[発泡体基材の引張強さ]
発泡体基材の流れ方向と幅方向の引張強さは、JISK6767に準じて測定した。標線長さ2cm、幅1cmのサンプルを、テンシロン引張試験機を用い、23℃及び相対湿度50%RHの環境下、引張速度300mm/minの測定条件で測定した。得られた測定値の最大強度がサンプルの引張強度である。[Tensile strength of foam substrate]
The tensile strength in the flow direction and width direction of the foam substrate was measured according to JISK6767. A sample with a marked line length of 2 cm and a width of 1 cm was measured using a Tensilon tensile tester in an environment of 23 ° C. and a relative humidity of 50% RH under the measurement conditions of a tensile speed of 300 mm / min. The maximum strength of the measured value obtained is the tensile strength of the sample.
[発泡体基材の25%圧縮強度]
発泡体基材の25%圧縮強度は、JISK6767に準じて測定した。25角に切断した試料を厚さ約10mmになるまで重ね合わせた。試料より大きな面積のステンレス板で試料をはさみ、23℃下で10mm/分の速度で試料を約2.5mm(もとの厚さの25%分)圧縮した時の強度を測定した。[25% compressive strength of foam substrate]
The 25% compressive strength of the foam substrate was measured according to JISK6767. Samples cut into 25 squares were stacked to a thickness of about 10 mm. The sample was sandwiched between stainless plates having a larger area than the sample, and the strength was measured when the sample was compressed at about 25 mm (25% of the original thickness) at a rate of 10 mm / min at 23 ° C.
[発泡体基材の平均気泡径測定]
はじめに、発泡体基材を幅方法、流れ方向とも1cmに切断した。次に、切断した発泡体基材の切断面中央部分をデジタルマイクロスコープ(商品名「KH−7700」、HiROX社製)により、発泡体気泡部分を200倍に拡大したのち、発泡体基材の幅方向または流れ方向の断面を発泡体基材の切断面がその基材厚さ方向の全長を観察する。得られた拡大画像において、流れ方向または幅方向の拡大前の実際の長さが2mm分の切断面に存在する気泡の気泡径を全て測定し、その平均値から平均気泡径を算出した。任意の10カ所で測定した結果から平均気泡径を求めた。[Measurement of average cell diameter of foam substrate]
First, the foam base material was cut into 1 cm in both the width method and the flow direction. Next, the foam cell part is enlarged 200 times with a digital microscope (trade name “KH-7700”, manufactured by HiROX) at the center of the cut surface of the cut foam base material. The cross section in the width direction or the flow direction is observed on the entire length of the cut surface of the foam base material in the thickness direction of the base material. In the obtained enlarged image, all the bubble diameters of the bubbles existing on the cut surface having an actual length of 2 mm before expansion in the flow direction or the width direction were measured, and the average bubble diameter was calculated from the average value. The average bubble diameter was determined from the results of measurement at any 10 locations.
[易解体性]
1)長さ2cm(発泡体基材の流れ方向)、幅1cmの試験片に加工した発泡体基材中芯の両面粘着テープを、縦2.5cm、横4.0cm、2mm厚のポリカーボネート板の中心に幅方向に2cmの間隔をあけて2枚貼付した。[Easy disassembly]
1) Polycarbonate plate of 2.5 cm in length, 4.0 cm in width, and 2 mm thickness on a double-sided adhesive tape with a foam base material core processed into a test piece having a length of 2 cm (the flow direction of the foam base material) and a width of 1 cm Two sheets were affixed to the center of the sheet at an interval of 2 cm in the width direction.
2)長さ20cm、幅1.5cm、50μm厚のPETフィルムの端部を前記ポリカーボネート板のテープ貼付面の裏面に固定し、そのPETフィルムが2枚の両面粘着テープを通るように巻き付けた。その際、PETフィルムの幅の中心が、2枚の両面粘着テープの中心と一致するようにした。 2) An end of a PET film having a length of 20 cm, a width of 1.5 cm, and a thickness of 50 μm was fixed to the back surface of the tape application surface of the polycarbonate plate, and the PET film was wound so as to pass through two double-sided adhesive tapes. At that time, the center of the width of the PET film was made to coincide with the center of the two double-sided pressure-sensitive adhesive tapes.
3)前記PETフィルムを巻き付け固定したポリカーボネート板を、両面粘着テープが接するになるようにして、縦20cm、横20cmのアルミ板の表面に貼付固定し、2kgの重りを使用して加圧圧着した。23℃50%RH下で72時間静置して試験片とした。 3) The polycarbonate plate on which the PET film is wound and fixed is adhered and fixed to the surface of an aluminum plate having a length of 20 cm and a width of 20 cm so that the double-sided adhesive tape comes into contact with the polycarbonate plate, and pressure-bonded using a 2 kg weight. . The test piece was left standing at 23 ° C. and 50% RH for 72 hours.
4)前記試験片のPETフィルムの端部をアルミ板に対して90°方向に引きあげて、ポリカーボネート板を引きはがした。その際の両面粘着テープの剥離状態を観察した。 4) The end portion of the PET film of the test piece was pulled up in the direction of 90 ° with respect to the aluminum plate, and the polycarbonate plate was peeled off. The peeling state of the double-sided adhesive tape at that time was observed.
◎:両面粘着テープの全面が発泡体基材の層間で破壊して剥離された。 A: The entire surface of the double-sided pressure-sensitive adhesive tape was broken and peeled between the layers of the foam base material.
○:両面粘着テープの9割以上が発泡体基材の層間で破壊して剥離された。 ○: 90% or more of the double-sided pressure-sensitive adhesive tape was broken and peeled between the layers of the foam base material.
×:両面粘着テープの発泡体基材の層間で破壊した部分が9割未満であった。 X: The part which destroyed between the layers of the foam base material of a double-sided adhesive tape was less than 90%.
[耐衝撃性試験]
1)厚さ2mm、外形50mm×50mmのアクリル板(三菱レイヨン(株)アクリライトL「商標名」、色相:透明)に、長さ40mm、幅5mmの2枚の両面粘着テープの弱粘着面を40mmの間隔をあけて平行に貼付(図1)したのち、厚さ2mm、外形150mm×100mmのABS板(住友ベークライト社製、タフエースR「商標名」色相:ナチュラル、シボなし、以下同じ)の中央部に貼付した(図2)。2kgローラーで1往復加圧したのち、23℃で1時間静置して試験片とした。[Impact resistance test]
1) Weak adhesive surface of two double-sided adhesive tapes 40mm long and 5mm wide on an acrylic plate (Mitsubishi Rayon Co., Ltd. Acrylite L "trade name", hue: transparent) with a thickness of 2mm and an external dimension of 50mm x 50mm Are attached in parallel with an interval of 40 mm (Fig. 1), and then an ABS plate having a thickness of 2 mm and an outer shape of 150 mm x 100 mm (manufactured by Sumitomo Bakelite Co., Ltd., Tuface R "trade name" hue: natural, no grain, the same applies hereinafter) It stuck on the center part of (FIG. 2). After reciprocating pressure with a 2 kg roller, the test piece was left at 23 ° C. for 1 hour.
2)デュポン式衝撃試験機(テスター産業株式会社製)の台座の上に、長さ150mm、幅100mm、高さ45mmのコの字型測定台(厚さ5mmのアルミ製)を設置し、その上に試験片を、アクリル板を下向きにして載せた(図3)。ABS板側から直径25mm、質量300gのステンレス製の撃芯を、高さを10cmずつ変化させ、ABS板の中心部分に各高さから10秒間隔で5回落下させ、試験片にテープの剥がれや破壊が認められた時の高さを測定した。 2) A U-shaped measuring table (made of aluminum with a thickness of 5 mm) having a length of 150 mm, a width of 100 mm and a height of 45 mm is installed on the base of the DuPont impact tester (manufactured by Tester Sangyo Co., Ltd.). The test piece was placed on top with the acrylic plate facing down (FIG. 3). A stainless steel striker with a diameter of 25 mm and a mass of 300 g from the ABS plate side is changed in height by 10 cm and dropped 5 times at 10-second intervals from the height to the center of the ABS plate, and the tape is peeled off from the test piece. The height at which breakage was observed was measured.
○:高さ60cmでも試験後にテープの剥がれ又は破壊なし
×:高さ60cm以下でテープの剥がれ又は破壊が生じた○: No peeling or breaking of the tape after the test even at a height of 60 cm ×: peeling or breaking of the tape occurred at a height of 60 cm or less
上記実施例1〜13のとおり、本発明の両面粘着テープは、被着体との優れた落下衝撃耐性、易解体性(層間割れ性)を有するものであった。一方、比較例1〜6の両面粘着テープは落下衝撃に対し充分な耐性が無い、あるいは易解体性(層間割れ性)に劣るものであった。 As the said Examples 1-13, the double-sided adhesive tape of this invention had the outstanding drop impact resistance with a to-be-adhered body, and easy disassembly property (interlaminar crack property). On the other hand, the double-sided pressure-sensitive adhesive tapes of Comparative Examples 1 to 6 did not have sufficient resistance to drop impact, or were inferior in easy disassembly (interlaminar crackability).
1 粘着テープ
2 アクリル板
3 ABS板
4 コの字型測定台
5 撃芯DESCRIPTION OF SYMBOLS 1
Claims (7)
前記粘着剤層は、アクリル系重合体と、架橋剤と、前記アクリル系重合体100質量部に対して50質量部〜65質量部の粘着付与樹脂とを含有する粘着剤組成物から形成されるものであり、
前記発泡体基材が、密度0.15〜0.45g/cm 3 、層間強度10〜50N/cm、厚さ50〜250μm、25%圧縮強度10〜500kPa、流れ方向及び幅方向の引張強さ500〜1300N/cm 2 、流れ方向の引張伸度100〜1200%、流れ方向及び幅方向の平均気泡径10〜500μm、厚さ方向の平均気泡径3〜100μmのポリオレフィン系発泡体基材であり、
前記粘着剤層が、厚さ25μmのポリエチレンテレフタレート基材に、乾燥後の粘着剤層の厚さが25μmとなるように前記粘着剤組成物を塗工し、80℃で3分乾燥した後、40℃の環境下で48時間熟成することによって厚さ25μmの粘着剤層を設けて形成した粘着テープを、温度23℃及び相対湿度65%RHの環境下でアルミニウム板に、2kgローラーを使用し一往復させることで圧着させ、温度23℃及び相対湿度50%RHの環境下に1時間静置した後に測定される剥離速度300mm/minにおける180°引き剥がし接着力が12〜25N/20mmの粘着剤層であることを特徴とする両面粘着テープ。 A double-sided adhesive tape having an adhesive layer on both sides of a foam substrate,
The pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing an acrylic polymer, a crosslinking agent, and 50 to 65 parts by mass of a tackifier resin with respect to 100 parts by mass of the acrylic polymer. Is,
The foam base material has a density of 0.15 to 0.45 g / cm 3 , an interlayer strength of 10 to 50 N / cm, a thickness of 50 to 250 μm, a 25% compressive strength of 10 to 500 kPa, and a tensile strength in the flow direction and the width direction. It is a polyolefin-based foam base material having 500 to 1300 N / cm 2 , tensile elongation of 100 to 1200% in the flow direction, average cell diameter in the flow direction and width direction of 10 to 500 μm, and average cell diameter in the thickness direction of 3 to 100 μm. ,
After the pressure-sensitive adhesive layer is applied to a polyethylene terephthalate substrate having a thickness of 25 μm, the pressure-sensitive adhesive composition is applied so that the thickness of the pressure-sensitive adhesive layer after drying is 25 μm, and dried at 80 ° C. for 3 minutes. An adhesive tape formed by aging for 48 hours in an environment of 40 ° C. and having an adhesive layer having a thickness of 25 μm was applied to an aluminum plate in an environment of a temperature of 23 ° C. and a relative humidity of 65% RH using a 2 kg roller. Adhesiveness of 12 to 25 N / 20 mm with 180 ° peel adhesion at a peel rate of 300 mm / min measured after being reciprocated once and left in an environment of temperature 23 ° C. and relative humidity 50% RH for 1 hour. A double-sided pressure-sensitive adhesive tape characterized by being an agent layer.
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JP6367599B2 (en) * | 2013-11-22 | 2018-08-01 | 日東電工株式会社 | Double-sided adhesive sheet |
CN104650757A (en) * | 2013-11-22 | 2015-05-27 | 日东电工株式会社 | Double-sided adhesive piece |
KR102292340B1 (en) * | 2013-12-25 | 2021-08-24 | 디아이씨 가부시끼가이샤 | Double-sided adhesive tape and electronic device |
WO2016035747A1 (en) * | 2014-09-02 | 2016-03-10 | 積水化学工業株式会社 | Double-sided adhesive tape for portable electronic device |
JP6476734B2 (en) * | 2014-10-22 | 2019-03-06 | Dic株式会社 | Adhesive tape, article obtained using adhesive tape, and method for disassembling article |
JP6557501B2 (en) * | 2014-10-31 | 2019-08-07 | 積水化学工業株式会社 | Adhesive tape |
JP2016098259A (en) * | 2014-11-18 | 2016-05-30 | 積水化学工業株式会社 | Double sided adhesive tape |
CN108307640B (en) * | 2015-04-21 | 2021-10-26 | 株式会社寺冈制作所 | Adhesive sheet |
KR102645230B1 (en) * | 2017-03-15 | 2024-03-07 | 세키스이가가쿠 고교가부시키가이샤 | double sided adhesive tape |
TWI804497B (en) * | 2017-06-26 | 2023-06-11 | 日商迪愛生股份有限公司 | Adhesive tape and method for peeling adhesive tape from adherend |
EP3680305A4 (en) * | 2017-08-30 | 2021-04-07 | Teraoka Seisakusho Co., Ltd. | Adhesive tape |
JP7044878B2 (en) * | 2019-02-25 | 2022-03-30 | 積水化学工業株式会社 | Double-sided adhesive tape, electronic device parts and electronic devices |
CN112011280A (en) * | 2020-08-31 | 2020-12-01 | 辛格顿(常州)新材料科技有限公司 | Manufacturing and laminating process of waterproof flame-retardant foam |
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