WO2022244796A1 - 表面保護フィルム - Google Patents
表面保護フィルム Download PDFInfo
- Publication number
- WO2022244796A1 WO2022244796A1 PCT/JP2022/020631 JP2022020631W WO2022244796A1 WO 2022244796 A1 WO2022244796 A1 WO 2022244796A1 JP 2022020631 W JP2022020631 W JP 2022020631W WO 2022244796 A1 WO2022244796 A1 WO 2022244796A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- styrene
- weight
- component
- adhesive layer
- less
- Prior art date
Links
- 239000010410 layer Substances 0.000 claims abstract description 76
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims abstract description 64
- 238000000034 method Methods 0.000 claims abstract description 42
- 238000000685 Carr-Purcell-Meiboom-Gill pulse sequence Methods 0.000 claims abstract description 14
- 239000007787 solid Substances 0.000 claims abstract description 9
- 239000000758 substrate Substances 0.000 claims abstract description 8
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 128
- 229920001971 elastomer Polymers 0.000 claims description 52
- 239000000806 elastomer Substances 0.000 claims description 51
- 229920006132 styrene block copolymer Polymers 0.000 claims description 51
- 239000011347 resin Substances 0.000 claims description 50
- 229920005989 resin Polymers 0.000 claims description 50
- 229920000642 polymer Polymers 0.000 claims description 35
- 230000001681 protective effect Effects 0.000 claims description 34
- 239000012790 adhesive layer Substances 0.000 claims description 23
- 150000001993 dienes Chemical class 0.000 claims description 16
- 239000007822 coupling agent Substances 0.000 claims description 10
- 239000000853 adhesive Substances 0.000 abstract description 87
- 230000001070 adhesive effect Effects 0.000 abstract description 87
- 239000000047 product Substances 0.000 description 42
- -1 styrene-ethylene propylene-styrene Chemical class 0.000 description 28
- 238000005481 NMR spectroscopy Methods 0.000 description 16
- 238000005259 measurement Methods 0.000 description 15
- 239000000203 mixture Substances 0.000 description 13
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 12
- 238000003860 storage Methods 0.000 description 12
- 229920001155 polypropylene Polymers 0.000 description 10
- 150000001875 compounds Chemical class 0.000 description 9
- 238000005859 coupling reaction Methods 0.000 description 9
- 239000004743 Polypropylene Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 239000000523 sample Substances 0.000 description 8
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 8
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 7
- 238000005984 hydrogenation reaction Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000006116 polymerization reaction Methods 0.000 description 6
- 238000003786 synthesis reaction Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 229920001577 copolymer Polymers 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 5
- 238000005227 gel permeation chromatography Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 4
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229920005672 polyolefin resin Polymers 0.000 description 4
- 229920000346 polystyrene-polyisoprene block-polystyrene Polymers 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000011342 resin composition Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 description 3
- SDJHPPZKZZWAKF-UHFFFAOYSA-N 2,3-dimethylbuta-1,3-diene Chemical compound CC(=C)C(C)=C SDJHPPZKZZWAKF-UHFFFAOYSA-N 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- UAHWPYUMFXYFJY-UHFFFAOYSA-N beta-myrcene Chemical compound CC(C)=CCCC(=C)C=C UAHWPYUMFXYFJY-UHFFFAOYSA-N 0.000 description 2
- MGNZXYYWBUKAII-UHFFFAOYSA-N cyclohexa-1,3-diene Chemical compound C1CC=CC=C1 MGNZXYYWBUKAII-UHFFFAOYSA-N 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920013716 polyethylene resin Polymers 0.000 description 2
- 229920005629 polypropylene homopolymer Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- FDNAPBUWERUEDA-UHFFFAOYSA-N silicon tetrachloride Chemical compound Cl[Si](Cl)(Cl)Cl FDNAPBUWERUEDA-UHFFFAOYSA-N 0.000 description 2
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- 150000003505 terpenes Chemical class 0.000 description 2
- 235000007586 terpenes Nutrition 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 2
- NSYRAUUZGRPOHS-BQYQJAHWSA-N (3E)-2-methylocta-1,3-diene Chemical compound CCCC\C=C\C(C)=C NSYRAUUZGRPOHS-BQYQJAHWSA-N 0.000 description 1
- AHAREKHAZNPPMI-AATRIKPKSA-N (3e)-hexa-1,3-diene Chemical compound CC\C=C\C=C AHAREKHAZNPPMI-AATRIKPKSA-N 0.000 description 1
- PMJHHCWVYXUKFD-SNAWJCMRSA-N (E)-1,3-pentadiene Chemical compound C\C=C\C=C PMJHHCWVYXUKFD-SNAWJCMRSA-N 0.000 description 1
- MYWOJODOMFBVCB-UHFFFAOYSA-N 1,2,6-trimethylphenanthrene Chemical compound CC1=CC=C2C3=CC(C)=CC=C3C=CC2=C1C MYWOJODOMFBVCB-UHFFFAOYSA-N 0.000 description 1
- KPAPHODVWOVUJL-UHFFFAOYSA-N 1-benzofuran;1h-indene Chemical compound C1=CC=C2CC=CC2=C1.C1=CC=C2OC=CC2=C1 KPAPHODVWOVUJL-UHFFFAOYSA-N 0.000 description 1
- WHFHDVDXYKOSKI-UHFFFAOYSA-N 1-ethenyl-4-ethylbenzene Chemical compound CCC1=CC=C(C=C)C=C1 WHFHDVDXYKOSKI-UHFFFAOYSA-N 0.000 description 1
- UVHXEHGUEKARKZ-UHFFFAOYSA-N 1-ethenylanthracene Chemical compound C1=CC=C2C=C3C(C=C)=CC=CC3=CC2=C1 UVHXEHGUEKARKZ-UHFFFAOYSA-N 0.000 description 1
- ZMYIIHDQURVDRB-UHFFFAOYSA-N 1-phenylethenylbenzene Chemical group C=1C=CC=CC=1C(=C)C1=CC=CC=C1 ZMYIIHDQURVDRB-UHFFFAOYSA-N 0.000 description 1
- IGGDKDTUCAWDAN-UHFFFAOYSA-N 1-vinylnaphthalene Chemical compound C1=CC=C2C(C=C)=CC=CC2=C1 IGGDKDTUCAWDAN-UHFFFAOYSA-N 0.000 description 1
- UHKPXKGJFOKCGG-UHFFFAOYSA-N 2-methylprop-1-ene;styrene Chemical compound CC(C)=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 UHKPXKGJFOKCGG-UHFFFAOYSA-N 0.000 description 1
- KGIGUEBEKRSTEW-UHFFFAOYSA-N 2-vinylpyridine Chemical compound C=CC1=CC=CC=N1 KGIGUEBEKRSTEW-UHFFFAOYSA-N 0.000 description 1
- DXIJHCSGLOHNES-UHFFFAOYSA-N 3,3-dimethylbut-1-enylbenzene Chemical compound CC(C)(C)C=CC1=CC=CC=C1 DXIJHCSGLOHNES-UHFFFAOYSA-N 0.000 description 1
- OCTVDLUSQOJZEK-UHFFFAOYSA-N 4,5-diethylocta-1,3-diene Chemical compound CCCC(CC)C(CC)=CC=C OCTVDLUSQOJZEK-UHFFFAOYSA-N 0.000 description 1
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 description 1
- UGWOAPBVIGCNOV-UHFFFAOYSA-N 5-ethenyldec-5-ene Chemical compound CCCCC=C(C=C)CCCC UGWOAPBVIGCNOV-UHFFFAOYSA-N 0.000 description 1
- VIZORQUEIQEFRT-UHFFFAOYSA-N Diethyl adipate Chemical compound CCOC(=O)CCCCC(=O)OCC VIZORQUEIQEFRT-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 239000013032 Hydrocarbon resin Substances 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229920000800 acrylic rubber Polymers 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- VYBREYKSZAROCT-UHFFFAOYSA-N alpha-myrcene Natural products CC(=C)CCCC(=C)C=C VYBREYKSZAROCT-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical class C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 description 1
- HGCIXCUEYOPUTN-UHFFFAOYSA-N cis-cyclohexene Natural products C1CCC=CC1 HGCIXCUEYOPUTN-UHFFFAOYSA-N 0.000 description 1
- 239000003484 crystal nucleating agent Substances 0.000 description 1
- 125000000113 cyclohexyl group Chemical class [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- YNLAOSYQHBDIKW-UHFFFAOYSA-M diethylaluminium chloride Chemical compound CC[Al](Cl)CC YNLAOSYQHBDIKW-UHFFFAOYSA-M 0.000 description 1
- 238000009820 dry lamination Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000002592 echocardiography Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 description 1
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 description 1
- SBRXLTRZCJVAPH-UHFFFAOYSA-N ethyl(trimethoxy)silane Chemical compound CC[Si](OC)(OC)OC SBRXLTRZCJVAPH-UHFFFAOYSA-N 0.000 description 1
- 229920005676 ethylene-propylene block copolymer Polymers 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229920006270 hydrocarbon resin Polymers 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229920004889 linear high-density polyethylene Polymers 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- PMJHHCWVYXUKFD-UHFFFAOYSA-N piperylene Natural products CC=CC=C PMJHHCWVYXUKFD-UHFFFAOYSA-N 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920006124 polyolefin elastomer Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000000425 proton nuclear magnetic resonance spectrum Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- AIFMYMZGQVTROK-UHFFFAOYSA-N silicon tetrabromide Chemical compound Br[Si](Br)(Br)Br AIFMYMZGQVTROK-UHFFFAOYSA-N 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 description 1
- 150000003606 tin compounds Chemical class 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
- IBOKZQNMFSHYNQ-UHFFFAOYSA-N tribromosilane Chemical compound Br[SiH](Br)Br IBOKZQNMFSHYNQ-UHFFFAOYSA-N 0.000 description 1
- ZDHXKXAHOVTTAH-UHFFFAOYSA-N trichlorosilane Chemical compound Cl[SiH](Cl)Cl ZDHXKXAHOVTTAH-UHFFFAOYSA-N 0.000 description 1
- 239000005052 trichlorosilane Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F297/00—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer
- C08F297/02—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the anionic type
- C08F297/04—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the anionic type polymerising vinyl aromatic monomers and conjugated dienes
-
- 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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
-
- 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
- C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
- C09J153/02—Vinyl aromatic monomers and conjugated dienes
-
- 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
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
Definitions
- the present invention relates to a surface protective film that has high adhesive strength (initial adhesive strength), and after being applied to an adherend, the adhesive strength does not easily increase even over time or at high temperatures, and can be peeled off without adhesive residue.
- a surface protective film is required to have high adhesive strength depending on the application. For example, when it is attached to an adherend having an uneven surface, a large contact area cannot be obtained, and peeling easily occurs at the interface between the adherend and the surface protective film. In such applications, the surface protective film is required to have a particularly high adhesive strength.
- the present disclosure 1 is a surface protective film having a substrate layer and an adhesive layer, wherein the adhesive layer is a component of L component obtained by measuring by CPMG method at 60 ° C. using pulse NMR a ratio of 10% or less, a relaxation time of 25 milliseconds or more and 80 milliseconds or less, and a component ratio of the L component obtained by measurement by the Solid Echo method at 25°C using pulse NMR of 30% or more,
- the surface protective film has a relaxation time of 65% or less and a relaxation time of 0.2 milliseconds or more and 0.4 milliseconds or less.
- the pressure-sensitive adhesive layer has a component ratio of 45% or more, a relaxation time of 0.4 milliseconds or more, and a relaxation time of 0.4 milliseconds or more, as measured by the CPMG method at 60° C. using pulse NMR of the pressure-sensitive adhesive layer.
- the surface protection film of the present disclosure 1 is 8 milliseconds or less.
- Present Disclosure 3 is the surface protection film according to Present Disclosure 1 or 2, wherein the pressure-sensitive adhesive layer contains a styrene-based elastomer.
- the present disclosure 4 is that the styrene-based elastomer is a styrene block copolymer having a structure represented by the general formula A-B or a hydrogenated product thereof (1), and the general formula A-B-A or the general formula (A -B)
- the content of the styrene block copolymer or its hydrogenated product (1) is 15% by weight or more and 50% by weight or less, and the styrene block copolymer or The surface protective film of the present disclosure 3, wherein the content of the hydrogenated product (2) is 50% by weight or more and 85% by weight or less.
- the pressure-sensitive adhesive layer further contains a tackifying resin, and the content of the tackifying resin is 12 parts by weight or more and 45 parts by weight or less with respect to 100 parts by weight of the styrene elastomer. It is the surface protective film of this disclosure 3 or 4.
- Present Disclosure 6 is the surface protection film of Present Disclosure 4, wherein n is 4 in the styrene-based elastomer (I).
- the present disclosure 7 is that the pressure-sensitive adhesive layer has a component ratio of L component of 6.5% or less, a relaxation time of 30 ms or more, and a relaxation time of 70 7.
- a surface protection film according to 1, 2, 3, 4, 5 or 6 of the present disclosure which is sub-milliseconds. The present invention will be described in detail below.
- the present inventors analyzed the pressure-sensitive adhesive layer of a surface protective film having a substrate layer and a pressure-sensitive adhesive layer using pulse NMR for measuring 1 H nuclei.
- pulsed NMR the free induction decay curve of spin-spin relaxation of the obtained 1 H nucleus is waveform-separated into multiple components, and the “relaxation time” of each component is obtained to evaluate the molecular mobility of that component. can do.
- the present inventors have investigated the pressure-sensitive adhesive layer, the component ratio and relaxation time of the L component obtained by measuring the CPMG method at 60 ° C. using pulse NMR, and Solid Echo at 25 ° C. using pulse NMR. It was investigated to adjust the component ratio of the L component and the relaxation time obtained by the method to a specific range.
- the present inventors have found that by using such an adhesive layer, the adhesive strength (initial adhesive strength) at the time of attachment is increased, while the increase in adhesive strength over time or at high temperatures is suppressed, and adhesive residue is reduced. can be suppressed, and have completed the present invention.
- the surface protective film of the present invention is a surface protective film having a substrate layer and an adhesive layer.
- the pressure-sensitive adhesive layer has a component ratio of L component of 10% or less and a relaxation time of 25 ms or more and 80 ms or less, as measured by CPMG method at 60° C. using pulse NMR.
- the “L component” obtained by measurement using pulse NMR means that the free induction decay curve of the spin-spin relaxation of 1 H nuclei obtained by measurement using pulse NMR is defined by the relaxation time. It means the component with the longest relaxation time when the waveform is separated into three components in ascending order. Waveform separation into three components (S component, M component and L component, respectively, in order of shortest relaxation time) is performed by analyzing the free induction decay curve by the least squares method.
- the “relaxation time” is the time required for electron spins to return from the excited state to the ground state after applying a magnetic field, and the longer the “relaxation time”, the higher the molecular mobility. That is, the S component is a hard component with relatively low molecular mobility, which has the shortest relaxation time, the magnetization intensity attenuates immediately, and the like.
- the L component is a soft component with relatively high molecular mobility, which has the longest relaxation time and slow decay of magnetization intensity.
- the M component is a component that has a relaxation time and molecular mobility intermediate between those of the S component and the L component.
- the component ratio of the L component at 60 ° C. is 10% or less, it means that there are few components with relatively high molecular mobility at high temperatures, and the adhesive layer has adhesive strength over time or at high temperatures. It is difficult to spread and can be peeled off without adhesive residue.
- a preferable upper limit of the component ratio of the L component at 60°C is 8%, and a more preferable upper limit is 6.5%.
- the lower limit of the component ratio of the L component at 60°C is not particularly limited, the preferred lower limit is 0.1%, and the more preferred lower limit is 0.3%.
- the relaxation time of the L component at 60 ° C. is 25 milliseconds or more, it means that the molecular mobility of the L component, which has relatively high molecular mobility at 60 ° C., is above a certain level. It is possible to prevent the storage elastic modulus at high temperature from becoming too high and leading to peeling. If the relaxation time of the L component at 60 ° C. is 80 milliseconds or less, it means that the molecular mobility of the L component, which has relatively high molecular mobility at 60 ° C., is suppressed to a certain level or less.
- the preferred lower limit of the relaxation time of the L component at 60°C is 26 ms, the more preferred lower limit is 28 ms, the still more preferred lower limit is 30 ms, the preferred upper limit is 75 ms, and the more preferred upper limit is 70 ms. is.
- the pressure-sensitive adhesive layer has an S component ratio of 45% or more and a relaxation time of 0.4 milliseconds or more and 0.8 milliseconds or less, as measured by the CPMG method at 60° C. using pulse NMR. is preferably When the component ratio of the S component at 60° C. is 45% or more, the adhesive strength of the adhesive layer is less likely to increase over time or at high temperatures, and the adhesive layer can be peeled off without leaving any sticky residue. A more preferable lower limit of the component ratio of the S component at 60°C is 48%. Although the upper limit of the component ratio of the S component at 60°C is not particularly limited, a preferable upper limit is 65%, and a more preferable upper limit is 60%.
- the relaxation time of the S component at 60° C. is within the above range, the pressure-sensitive adhesive layer is less likely to increase in adhesive strength over time or at high temperatures, and can be peeled off without leaving any sticky residue.
- the more preferable lower limit of the relaxation time of the S component at 60°C is 0.45 milliseconds
- the more preferable upper limit is 0.75 milliseconds
- the more preferable lower limit is 0.50 milliseconds
- the more preferable upper limit is 0.70. in milliseconds.
- the pressure-sensitive adhesive layer has a component ratio of L component of 30% or more and 65% or less, a relaxation time of 0.2 milliseconds or more, and 0 .4 milliseconds or less.
- the component ratio of the L component at 25° C. is within the above range, the pressure-sensitive adhesive layer can exhibit sufficient adhesive strength to adhere even to an adherend having an uneven surface.
- the preferred lower limit of the component ratio of the L component at 25°C is 35%, the preferred upper limit is 63%, the more preferred lower limit is 40%, the more preferred upper limit is 60%, and the even more preferred lower limit is 45%.
- the relaxation time of the L component at 25 ° C. is 0.2 milliseconds or more, it means that the molecular mobility of the L component, which has relatively high molecular mobility at 25 ° C., is above a certain level.
- the layer can sufficiently conform to the surface of an adherend having irregularities on its surface, and can have sufficient adhesion to the adherend. If the relaxation time of the L component at 25 ° C.
- the preferred lower limit of the relaxation time of the L component at 25°C is 0.21 ms, the preferred upper limit is 0.38 ms, the more preferred lower limit is 0.22 ms, and the more preferred upper limit is 0.35 ms. and a more preferred lower limit is 0.24 milliseconds.
- pulse NMR measurements are performed using a pulse NMR apparatus (e.g., the minispec mq20, manufactured by BRUKER) and analysis software (e.g., TD-NMR, manufactured by BRUKER, etc.), using a measurement sample prepared from the adhesive layer. can be performed at a given temperature.
- a measurement sample can be prepared by dissolving part of the pressure-sensitive adhesive layer in toluene, air-drying, and vacuum-drying at 30° C. to remove toluene.
- the method for adjusting the component ratio and relaxation time of the L component at 60° C. and the component ratio and relaxation time of the L component at 25° C. within the above ranges are not particularly limited.
- a method of using a styrene-based elastomer as the resin, a method of adjusting the structure, composition, weight average molecular weight (Mw), etc. of the styrene-based elastomer, and the like can be mentioned.
- a method of blending a tackifying resin into the pressure-sensitive adhesive layer a method of adjusting the type, physical properties (eg, softening point), blending amount, etc. of the tackifying resin, and the like can also be used.
- the method of adjusting the molding conditions of the said adhesive layer, etc. are mentioned.
- the base resin constituting the pressure-sensitive adhesive layer is not particularly limited, and examples thereof include styrene-based elastomers, acrylic elastomers, urethane-based elastomers, and olefin-based elastomers. Above all, it is easy to adjust the adhesive strength (initial adhesive strength) required for a surface protection film, and the molecular mobility of the adhesive layer can be adjusted by selecting the molecular structure such as styrene content or additives such as tackifiers. A styrene-based elastomer is suitable because it is relatively easy to adjust freely.
- the styrene-based elastomer is not particularly limited, and examples include styrene-ethylene propylene-styrene block copolymer (SEPS), hydrogenated styrene-butadiene rubber (HSBR), styrene-ethylenebutylene-styrene block copolymer (SEBS), styrene - ethylene-propylene block copolymer (SEP), styrene-ethylenebutylene block copolymer (SEB), styrene-isoprene block copolymer (SI), styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene block copolymers (SB), styrene-butadiene-styrene block copolymers (SBS), and the like.
- SEPS styrene-ethylene propylene-styrene block
- the weight average molecular weight (Mw) of the styrene-based elastomer is not particularly limited, but the preferred lower limit is 50,000 and the preferred upper limit is 400,000.
- the weight-average molecular weight (Mw) is 50,000 or more, the storage elastic modulus of the pressure-sensitive adhesive layer at high temperatures is higher, the adhesive strength is less likely to increase over time or at high temperatures, and the adhesive layer can be peeled off without an adhesive residue. be able to.
- the weight-average molecular weight (Mw) is 400,000 or less, the storage elastic modulus of the pressure-sensitive adhesive layer at room temperature does not increase excessively, and the adhesiveness when attached to an adherend becomes higher and the adhesive strength increases. (initial adhesive strength) becomes higher.
- a more preferable lower limit of the weight average molecular weight (Mw) is 80,000, and a more preferable upper limit thereof is 350,000.
- the weight average molecular weight (Mw) can be measured by the following method.
- the sample solution is filtered through a filter (material: polytetrafluoroethylene, pore diameter: 0.2 ⁇ m).
- the obtained filtrate is supplied to a gel permeation chromatograph (for example, Waters, 2690 Separations Model), GPC measurement is performed under the conditions of a sample flow rate of 1 ml/min and a column temperature of 40 ° C., and the polystyrene equivalent molecular weight of the sample is determined.
- As the column for example, GPC KF-806L (manufactured by Showa Denko KK) is used, and as the detector, a differential refractometer is used.
- styrene-based elastomer a styrene block copolymer having a structure represented by the general formula A-B or a hydrogenated product thereof (1), and the general formula A-B-A or the general formula (A-B ) n C or a styrene block copolymer having a structure represented by C or its hydrogenated product (2) is also preferred.
- the styrene-based elastomer (I) it becomes easy to adjust the component ratio and relaxation time of the L component at 60°C and the component ratio and relaxation time of the L component at 25°C within the above ranges.
- a styrene block copolymer having a structure represented by the above general formula AB or a hydrogenated product thereof (1) comprises an aromatic alkenyl polymer block represented by A above and a conjugated diene represented by B above. It is a linear styrene block copolymer having a polymer block or a hydrogenated product thereof.
- a styrene block copolymer having a structure represented by the above general formula ABA or a hydrogenated product thereof (2) comprises an aromatic alkenyl polymer block represented by A above and a block represented by B above. It is a linear styrene block copolymer having a conjugated diene polymer block or a hydrogenated product thereof.
- a styrene block copolymer having a structure represented by the above general formula (AB) n C or a hydrogenated product thereof (2) is represented by the above general formula AB centering on a coupling agent.
- the aromatic alkenyl polymer block represented by A above has repeating units derived from an aromatic alkenyl compound.
- the aromatic alkenyl compounds include styrene, tert-butylstyrene, ⁇ -methylstyrene, p-methylstyrene, p-ethylstyrene, divinylbenzene, 1,1-diphenylethylene, vinylnaphthalene, vinylanthracene, N, Examples include N-diethyl-p-aminoethylstyrene and vinylpyridine. Among them, styrene is preferable because it is easily available industrially.
- the content of repeating units derived from the aromatic alkenyl compound in the aromatic alkenyl polymer block represented by A is not particularly limited, but the preferred lower limit is 50% by weight and the preferred upper limit is 100% by weight, and more preferred.
- the lower limit is 70% by weight.
- repeating units derived from such other compounds is not particularly limited, and examples thereof include conjugated diene polymers, ethylene polymers, propylene polymers, and the like.
- the conjugated diene polymer block represented by B has repeating units derived from a conjugated diene compound.
- the conjugated diene compounds include 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 2-methyl-1,3-octadiene, and 1,3-hexadiene. , 1,3-cyclohexadiene, 4,5-diethyl-1,3-octadiene, 3-butyl-1,3-octadiene, myrcene, chloroprene and the like.
- These conjugated diene compounds may be used alone or in combination of two or more. Among them, 1,3-butadiene and isoprene are preferred because of their high polymerization reactivity and industrial availability.
- the content of repeating units derived from the conjugated diene compound in the conjugated diene polymer block represented by B is not particularly limited, but the preferred lower limit is 50% by weight, the preferred upper limit is 100% by weight, and the more preferred lower limit is 70% by weight.
- the conjugated diene polymer block represented by B contains repeating units derived from other compounds other than repeating units derived from the conjugated diene compound, it has repeating units derived from such other compounds.
- Blocks are not particularly limited, and examples thereof include aromatic alkenyl polymers, ethylene polymers, propylene polymers and the like.
- the coupling agent which is a raw material for the component derived from the coupling agent represented by C, is the linear styrene block copolymer, that is, the styrene block copolymer or its hydrogenated product (1) is radially It is a polyfunctional compound that binds.
- the coupling agent include silane compounds such as silane halides and alkoxysilanes, tin compounds such as tin halides, epoxy compounds such as polycarboxylic acid esters and epoxidized soybean oil, and acrylic compounds such as pentaerythritol tetraacrylate. Divinyl compounds such as esters, epoxysilanes, and divinylbenzene, and the like are included.
- More specific examples include trichlorosilane, tribromosilane, tetrachlorosilane, tetrabromosilane, methyltrimethoxysilane, ethyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, tetramethoxysilane, tetraethoxysilane, tetrachlorotin, diethyl adipate and the like.
- n is not particularly limited as long as it is an integer of 2 or more, it is preferably 3 or more.
- n is 3 or more, the moldability of the pressure-sensitive adhesive layer is improved even when the molecular weight of the styrene elastomer (I) is increased in order to adjust the relaxation time of the L component at 60°C to the above range. Easy to keep.
- n is 4 because it is easy to adjust the component ratio and relaxation time of the L component at 60°C and the component ratio and relaxation time of the L component at 25°C within the above ranges.
- n it is also called 3-branch type, and when n is 4, it is also called 4-branch type.
- the styrene elastomer (I) is easy to adjust the component ratio and relaxation time of the L component at 60°C and the component ratio and relaxation time of the L component at 25°C within the above ranges. It is preferable to have the hydrogenation rate, weight average molecular weight, diblock ratio, styrene content, butylene content, coupling ratio, etc. within the stated ranges.
- the hydrogenated product is a partially hydrogenated product. It may be present, or it may be a completely hydrogenated product. Among them, preferably 80% or more, more preferably 90% or more, still more preferably 95% or more of the double bonds (unsaturated bonds) of the repeating units derived from the conjugated diene compound are converted to saturated bonds by hydrogenation.
- Hydrogenated compounds containing The hydrogenation ratio means the hydrogenation rate calculated from the 1 H-NMR spectrum at 270 MHz using carbon tetrachloride as a solvent.
- the weight average molecular weight (Mw1) of the styrene block copolymer or its hydrogenated product (1) is not particularly limited, but the preferred lower limit is 40,000 and the preferred upper limit is 150,000.
- the weight-average molecular weight (Mw1) is 40,000 or more
- the weight-average molecular weight (Mw2) of the styrene block copolymer or hydrogenated product thereof (2) increases, and the high-temperature storage elastic modulus of the pressure-sensitive adhesive layer increases. is higher, the adhesive strength is less likely to increase over time or at high temperatures, and the adhesive can be peeled off without leaving any sticky residue.
- the weight-average molecular weight (Mw1) is 150,000 or less
- the weight-average molecular weight (Mw2) of the styrene block copolymer or hydrogenated product thereof (2) does not excessively increase, and the pressure-sensitive adhesive layer can be Since the storage elastic modulus of is not excessively increased, the adhesiveness when attached to an adherend becomes higher, and the adhesive strength (initial adhesive strength) becomes higher.
- a more preferable lower limit of the weight average molecular weight (Mw1) is 50,000, a more preferable upper limit is 140,000, a still more preferable lower limit is 60,000, and a further preferable upper limit is 120,000.
- the weight average molecular weight (Mw2) of the styrene block copolymer or hydrogenated product thereof (2) is 2.5 times or more the weight average molecular weight (Mw1) of the styrene block copolymer or hydrogenated product thereof (1). is preferably When the weight-average molecular weight (Mw2) is 2.5 times or more the weight-average molecular weight (Mw1), the storage elastic modulus of the pressure-sensitive adhesive layer at high temperatures is higher, and the adhesive strength is higher over time or at high temperatures. It is difficult to spread and can be peeled off without leaving any sticky residue.
- the weight average molecular weight (Mw2) is 2.5 times or more the weight average molecular weight (Mw1)
- the styrene elastomer (I) is said to be of radial type.
- the weight average molecular weight (Mw2) is less than 2.5 times the weight average molecular weight (Mw1)
- the styrene elastomer (I) is said to be of linear type.
- the weight average molecular weight (Mw2) is more preferably 2.7 times or more the weight average molecular weight (Mw1), and still more preferably 3.0 times or more.
- the weight average molecular weight of the styrene-based elastomer (I) as a whole is not particularly limited, but the preferred lower limit is 50,000 and the preferred upper limit is 400,000.
- the preferred lower limit is 50,000 or more
- the storage elastic modulus of the pressure-sensitive adhesive layer at high temperatures becomes higher, the pressure-sensitive adhesive strength is less likely to increase over time or at high temperatures, and the adhesive layer can be peeled off with less adhesive residue. .
- the weight-average molecular weight is 400,000 or less, the storage elastic modulus of the pressure-sensitive adhesive layer at room temperature does not increase excessively, and the adhesion when sticking to an adherend becomes higher, and the adhesive strength (initial adhesive strength force) is higher.
- a more preferable lower limit of the weight-average molecular weight is 80,000, a more preferable upper limit is 350,000, a still more preferable lower limit is 100,000, and a further preferable upper limit is 320,000.
- the content (diblock ratio) of the styrene block copolymer or hydrogenated product thereof (1) in 100% by weight of the styrene elastomer (I) has a preferred lower limit of 15% by weight and a preferred upper limit of 50% by weight. be.
- the pressure-sensitive adhesive layer can be attached to an adherend without excessively increasing the storage modulus at room temperature. The adhesiveness at the time becomes higher, and the adhesive strength (initial adhesive strength) becomes higher.
- the content of the styrene block copolymer or its hydrogenated product (1) is 50% by weight or less, the storage modulus of the pressure-sensitive adhesive layer at high temperatures becomes higher, and the adhesive strength increases over time or at high temperatures. It is less likely to spread and can be peeled off without leaving an adhesive residue.
- a more preferable lower limit of the content of the styrene block copolymer or its hydrogenated product (1) is 18% by weight, a more preferable upper limit is 47% by weight, a still more preferable lower limit is 20% by weight, and a further preferable upper limit is 45% by weight. %.
- the content of the styrene block copolymer or hydrogenated product thereof (2) in 100% by weight of the styrene elastomer (I) has a preferred lower limit of 50% by weight and a preferred upper limit of 85% by weight, A more preferable lower limit is 53% by weight, and a more preferable upper limit is 72% by weight.
- the styrene block copolymer or hydrogenated product thereof (1) and the styrene block copolymer or hydrogenated product thereof (2) 100% by weight of the styrene elastomer (I) contains , may further contain other components.
- the diblock ratio can be calculated from the peak area ratio of each copolymer measured by gel permeation chromatography (GPC).
- the weight ratio of the aromatic alkenyl polymer block represented by A and the conjugated diene polymer block represented by B in the entire styrene elastomer (I) is not particularly limited.
- the conjugated diene polymer represented by B in the total of the aromatic alkenyl polymer block represented by A and the conjugated diene polymer block represented by B in the entire styrene elastomer (I) The block content has a preferred lower limit of 35% by weight and a preferred upper limit of 95% by weight.
- the pressure-sensitive adhesive layer has improved moldability and further improved adhesion when attached to an adherend.
- a more preferable lower limit to the content of the conjugated diene polymer block represented by B is 45% by weight, and a more preferable upper limit is 87% by weight.
- Types of the styrene elastomer (I) include styrene-ethylenebutylene-styrene block copolymer (SEBS) type, styrene-ethylenepropylene-styrene block copolymer (SEPS) type, and styrene-isobutylene-styrene block copolymer.
- SEBS styrene-ethylenebutylene-styrene block copolymer
- SEPS styrene-ethylenepropylene-styrene block copolymer
- SIBS combined
- the type of the styrene elastomer (I) being SEBS type means the styrene block copolymer or hydrogenated product thereof (1), and the styrene block copolymer or hydrogenated product thereof ( 2) has repeating units derived from styrene, repeating units derived from ethylene, and repeating units derived from butylene.
- the aromatic alkenyl polymer block represented by A above is a block having repeating units derived from styrene
- the conjugated diene polymer block (hydrogenated product thereof) represented by B above is an ethylene-derived repeating unit. It means a block having a unit and a repeating unit derived from butylene.
- the content of repeating units derived from styrene (styrene content) in the entire styrene-based elastomer (I) is not particularly limited, but the preferred lower limit is 5 weights. %, the preferred upper limit is 30% by weight.
- the styrene content is within the above range, the pressure-sensitive adhesive layer has improved moldability and further improved adhesiveness when attached to an adherend, resulting in high adhesive strength (initial adhesive strength).
- the adhesive strength does not easily increase over time or at high temperatures, the adhesive can be peeled off without leaving any adhesive residue, and the conformability to the adherend is further improved.
- a more preferable lower limit of the styrene content is 7% by weight, and a more preferable upper limit is 20% by weight.
- the content of butylene-derived repeating units (butylene content) in the entire styrene-based elastomer (I) is not particularly limited, but the preferred lower limit is 30% by weight. %, the preferred upper limit is 90% by weight.
- the butylene content is within the above range, the pressure-sensitive adhesive layer has improved moldability and further improved adhesiveness when attached to an adherend, resulting in high adhesive strength (initial adhesive strength).
- the adhesive strength does not easily increase over time or at high temperatures, the adhesive can be peeled off without leaving any adhesive residue, and the conformability to the adherend is further improved.
- a more preferable lower limit of the butylene content is 35% by weight, and a more preferable upper limit is 80% by weight.
- the method for producing the styrene-based elastomer (I) is not particularly limited, and examples thereof include the following methods. First, the step (a) of synthesizing the aromatic alkenyl polymer block represented by A above is performed. Next, a styrene block copolymer (1) having a structure represented by the general formula AB is synthesized by polymerizing a conjugated diene compound on the aromatic alkenyl polymer block represented by A above. Step (b) is performed.
- the obtained styrene block copolymer (1) having a structure represented by the general formula AB is subjected to a coupling reaction using a coupling agent to obtain the general formula ABA or the general formula
- the step (c) of obtaining a styrene block copolymer (2) having a structure represented by (AB) nC is performed.
- the coupling ratio at this time is not particularly limited, the diblock ratio (the content of the styrene block copolymer or hydrogenated product thereof (1) in 100% by weight of the styrene elastomer (I)) is as described above. From the viewpoint of adjusting the range, the preferred lower limit is 50% and the preferred upper limit is 97%.
- a more preferred lower limit of the coupling rate is 55%, a more preferred upper limit is 95%, a further preferred lower limit is 58%, a still more preferred upper limit is 90%, a still more preferred lower limit is 60%, and a still more preferred upper limit is 85%. %. If necessary, the step (d) of hydrogenating the styrene block copolymer (1) and the styrene block copolymer (2) is performed.
- the pressure-sensitive adhesive layer preferably further contains a tackifying resin.
- a tackifying resin By adjusting the type, physical properties (e.g., softening point), blending amount, etc. of the tackifying resin, the component ratio and relaxation time of the L component at 60 ° C., and the component ratio of the L component at 25 ° C. And it becomes easy to adjust the relaxation time to the above range.
- the tackifying resin is not particularly limited, but preferably has a softening point of 80° C. or higher, more preferably 90° C. or higher and 140° C. or lower.
- the tackifying resin include petroleum-based resins such as aliphatic copolymers, aromatic copolymers, aliphatic-aromatic copolymers, and alicyclic copolymers, coumarone-indene-based resins, terpene-based resins, Terpene phenol-based resins, rosin-based resins such as polymerized rosin, (alkyl)phenol-based resins, xylene-based resins, hydrogenated products thereof, and the like are included.
- a tackifying resin that is commercially available as a mixture with a polyolefin resin may also be used. These tackifying resins may be used alone or in combination of two or more.
- the tackifying resin is preferably a hydrogenated product, since the adhesive strength of the adhesive layer does not easily increase over time or at high temperatures, and the adhesive layer can be peeled off without leaving any adhesive residue.
- the content of the tackifying resin is not particularly limited, but the preferred lower limit is 12 parts by weight and the preferred upper limit is 45 parts by weight with respect to 100 parts by weight of the base resin such as the styrene elastomer. If the content of the tackifying resin is 12 parts by weight or more, the followability to the adherend is improved by reducing the storage elastic modulus of the pressure-sensitive adhesive layer, and the S component at 25 ° C. By increasing the component ratio, the molecular mobility of the pressure-sensitive adhesive layer is suppressed, and it is possible to prevent the pressure-sensitive adhesive layer from following the adherend more than necessary and increasing the pressure-sensitive adhesive strength.
- the relaxation time of the L component at 60°C does not become too long, and the adhesive strength of the adhesive layer does not easily increase over time or at high temperatures. It can be peeled off without sticky residue.
- a more preferable lower limit of the content of the tackifying resin is 15 parts by weight, a more preferable upper limit is 40 parts by weight, a still more preferable lower limit is 18 parts by weight, and a still more preferable upper limit is 35 parts by weight.
- the pressure-sensitive adhesive layer may further contain an adhesive strength modifier, plasticizer, emulsifier, softener, fine particles, filler, pigment, dye, silane coupling agent, antioxidant, surfactant, wax, etc., as necessary. It may contain known additives.
- the thickness of the pressure-sensitive adhesive layer is not particularly limited, but the preferred lower limit is 1.5 ⁇ m and the preferred upper limit is 30 ⁇ m. If the thickness of the pressure-sensitive adhesive layer is 1.5 ⁇ m or more, the pressure-sensitive adhesive strength will be sufficiently high. If the thickness of the pressure-sensitive adhesive layer is 30 ⁇ m or less, it can be peeled off more easily. A more preferable lower limit of the thickness of the pressure-sensitive adhesive layer is 2.0 ⁇ m, and a more preferable upper limit thereof is 20 ⁇ m.
- the base material layer is not particularly limited, it preferably contains a polyolefin resin.
- the polyolefin resin is not particularly limited, and conventionally known polyolefin resins can be used. Examples thereof include polypropylene (PP) resin, polyethylene (PE) resin, and the like. Examples of the polypropylene resin include homopolypropylene, random polypropylene, and block polypropylene. Examples of the polyethylene resin include high-pressure low-density polyethylene, linear low-density polyethylene, and high-density polyethylene. Among them, polypropylene resin is preferable from the viewpoint of transparency, rigidity and heat resistance, and homopolypropylene is preferable. Also preferred are mixtures of polypropylene and polyethylene.
- the base material layer contains additives such as antistatic agents, release agents, antioxidants, weathering agents, crystal nucleating agents, and resins such as polyolefins, polyesters, polyamides, and elastomers, as long as they do not impair the effects of the present invention. It may contain modifiers.
- the thickness of the base material layer is not particularly limited, but the preferred lower limit is 20 ⁇ m and the preferred upper limit is 200 ⁇ m. If the thickness of the base material layer is within the above range, the handleability of the surface protective film is improved. A more preferable lower limit of the thickness of the substrate layer is 25 ⁇ m, and a more preferable upper limit thereof is 188 ⁇ m.
- the method for producing the surface protective film of the present invention is not particularly limited.
- a method of laminating layers can be mentioned.
- a method of co-extrusion molding by a T-die method may also be used.
- the method of co-extrusion molding is preferable.
- the raw materials for the pressure-sensitive adhesive layer in advance using a twin-screw extruder to prepare compound pellets (pressure-sensitive adhesive composition). Then, the prepared pressure-sensitive adhesive composition is put into a single-screw extruder set so that the cylinder temperature rises step by step from 100 to 150 ° C. to the tip temperature of 200 to 230 ° C., and the pressure-sensitive adhesive layer is formed. preferably. Further, it is preferable that the flow path of the mold, feed block, etc. is adjusted to 200 to 230.degree.
- Adding a process that increases the heat history more than necessary, or conversely, performing a process that does not sufficiently knead the raw material will cause the above 60 ° C. It may not be possible to adjust the component ratio and relaxation time of the L component of and the component ratio and relaxation time of the L component at 25 ° C. within the above ranges.
- the surface protective film of the present invention has a high adhesive strength (initial adhesive strength), does not easily increase in adhesive strength even over time or at high temperatures, and can be peeled off without adhesive residue.
- the surface protective film of the present invention may be used to protect the surface of an adherend having a smooth surface, but is particularly useful when used to protect the surface of an adherend having an uneven surface. Highly effective.
- the surface protection film of the present invention is suitably used to protect the surfaces of members such as optical devices, metal plates, coated metal plates, resin plates, and glass plates. Among others, it is particularly suitable for protecting optical members having an uneven surface on one side or both sides such as a prism sheet and a diffusion film.
- a surface protective film that has a high adhesive strength (initial adhesive strength) and that, after being attached to an adherend, the adhesive strength does not easily increase even over time or at high temperatures and can be peeled off without adhesive residue.
- Synthesis of Resin 1 (Synthesis of Resin 1) (Synthesis example 1) 500 parts by weight of degassed and dehydrated cyclohexane, 10 parts by weight of styrene and 5 parts by weight of tetrahydrofuran were charged into a reaction vessel purged with nitrogen, and 0.13 parts by weight of n-butyllithium was added at 40°C, the polymerization initiation temperature. Then, temperature-rising polymerization was carried out to obtain an aromatic alkenyl polymer block (block A).
- the hydrogenated product (1) of the styrene block copolymer having the structure represented by the general formula AB, which has the styrene content and the diblock ratio shown in Table 1, and the general formula (AB) A styrene - based elastomer containing hydrogenated styrene block copolymer (2) having a structure represented by 4C was obtained. A part of the polymer was taken out and subjected to GPC analysis to determine the weight average molecular weight (Mw).
- Resin 7 was a linear styrene elastomer.
- DYNARON8300P styrene-ethylenebutylene-styrene block copolymer (SEBS), manufactured by JSR
- Example 1 Production of Surface Protective Film
- a raw material for the base material layer 100 parts by weight of a block polypropylene resin (J715M, manufactured by Prime Polymer Co., Ltd.) was blended to obtain a resin composition.
- a resin composition 100 parts by weight of Resin 1 as a styrene-based elastomer, and an alicyclic saturated hydrocarbon resin (P125, manufactured by Arakawa Chemical Industries, Ltd., softening point 125° C., hydrogenation rate 95%) as a tackifying resin. 15 parts by weight of the above) were added to obtain a mixture.
- the resulting mixture was extruded using a twin-screw extruder, and the extruded strand was cooled with water and cut to obtain a compound pressure-sensitive adhesive composition having a diameter of about 3 mm.
- the resin composition obtained above was used as a raw material for the substrate layer, and the adhesive composition obtained above was used as a raw material for the adhesive layer, and co-extrusion molding was performed by a T-die method.
- the pressure-sensitive adhesive composition is put into a ⁇ 65mm extruder adjusted to a root temperature of 150°C and a tip temperature of 230°C, and the resin composition is put into a ⁇ 115mm and ⁇ 75mm extruder adjusted to a root temperature of 200°C and a tip temperature of 230°C.
- the three layers were coextruded from a multi-manifold mold through a polymer filter and feedblock.
- the extruded resin is cooled by a cast roll adjusted to 30 ° C., and the base layer is 35 ⁇ m (the thickness of the layer derived from the ⁇ 75 mm extruder is 8 ⁇ m, and the extrusion rate is adjusted to the thickness of the layer derived from the ⁇ 115 mm extruder is about 27 ⁇ m).
- a film having an adhesive layer of 3 ⁇ m was wound up to obtain a roll of surface protection film.
- the temperature was raised, then held at 60°C for 10 minutes, and then the CPMG method was performed at 60°C.
- the obtained 1 H nucleus spin-spin relaxation free induction decay curve was separated into three curves derived from the three components of the S component, the M component, and the L component, and the component ratio and relaxation of the S component and the L component were calculated. asked for time. Waveform separation was performed by fitting using both the Gaussian type and the exponential type. In addition, in the Solid Echo method at 25 ° C.
- the S component is a Gaussian type
- the M component and the L component was fitted using the exponential type.
- fitting was performed using the exponential type for all of the S, M and L components.
- fitting was performed using points up to 0.6 milliseconds of the relaxation curve obtained, and in the CPMG method, fitting was performed using all points. The following formula was used for fitting.
- w1 to w3 are Weibull coefficients.
- Solid Echo method w1 takes a value of 2
- w2 and w3 take a value of 1
- w1 to w3 of the CPMG method take a value of 1.
- A1 is the S component
- B1 is the M component
- C1 is the L component ratio
- T2A is the S component
- T2B is the M component
- T2C the L component's relaxation time.
- t is time.
- Examples 2 to 8, Comparative Examples 1 to 6) A surface protective film was obtained in the same manner as in Example 1, except that the styrene-based elastomer or tackifier resin was changed as shown in Table 2.
- Example 7 the styrene-based elastomer and the tackifying resin were the same as in Example 2, but the extruder into which the pressure-sensitive adhesive composition was introduced was changed to a ⁇ 45 mm extruder, and the base temperature of the extruder was 190 ° C. The temperature was changed to 230°C and the cast roll temperature to 40°C.
- a surface protective film that has a high adhesive strength (initial adhesive strength) and that, after being attached to an adherend, the adhesive strength does not easily increase even over time or at high temperatures and can be peeled off without adhesive residue.
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Abstract
Description
A:芳香族アルケニル重合体ブロック
B:共役ジエン重合体ブロック
C:カップリング剤に由来する成分
n:2以上の整数
以下に本発明を詳述する。
本発明者らは、粘着剤層について、パルスNMRを用いて60℃でCPMG法にて測定して得られたL成分の成分比率及び緩和時間、並びに、パルスNMRを用いて25℃でSolid Echo法にて測定して得られたL成分の成分比率及び緩和時間を特定範囲に調整することを検討した。本発明者らは、このような粘着剤層を用いることにより、貼り付けの際の粘着力(初期粘着力)を高める一方で、経時又は高温下で粘着力が昂進することを抑え、糊残りを抑えることができることを見出し、本発明を完成させるに至った。
上記60℃でのL成分の成分比率の下限は特に限定されないが、好ましい下限は0.1%、より好ましい下限は0.3%である。
上記60℃でのS成分の成分比率が45%以上であれば、上記粘着剤層は経時又は高温下でも粘着力がより昂進しにくく、より糊残りなく剥離することができる。上記60℃でのS成分の成分比率のより好ましい下限は48%である。
上記60℃でのS成分の成分比率の上限は特に限定されないが、好ましい上限は65%、より好ましい上限は60%である。
上記25℃でのL成分の成分比率が上記範囲内であれば、上記粘着剤層は、表面に凹凸形状を有する被着体にも貼り付くことができる充分な粘着力を発現することができる。上記25℃でのL成分の成分比率の好ましい下限は35%、好ましい上限は63%であり、より好ましい下限は40%、より好ましい上限は60%であり、更に好ましい下限は45%である。
なお、重量平均分子量(Mw)は、以下の方法により測定できる。
試料の溶液をフィルター(材質:ポリテトラフルオロエチレン、ポア径:0.2μm)で濾過する。得られた濾液をゲル浸透クロマトグラフ(例えば、Waters社製、2690 Separations Model)に供給して、サンプル流量1ミリリットル/min、カラム温度40℃の条件でGPC測定を行い、試料のポリスチレン換算分子量を測定して、重量平均分子量(Mw)を求める。カラムとしては、例えば、GPC KF-806L(昭和電工社製)を用い、検出器としては、示差屈折計を用いる。
A:芳香族アルケニル重合体ブロック
B:共役ジエン重合体ブロック
C:カップリング剤に由来する成分
n:2以上の整数
上記一般式A-B-Aで表される構造を有するスチレンブロック共重合体又はその水素添加物(2)は、上記Aで表される芳香族アルケニル重合体ブロックと、上記Bで表される共役ジエン重合体ブロックとを有するリニア状スチレンブロック共重合体又はその水素添加物である。上記一般式(A-B)nCで表される構造を有するスチレンブロック共重合体又はその水素添加物(2)は、カップリング剤を中心にして、上記一般式A-Bで表される構造を有するスチレンブロック共重合体又はその水素添加物(1)が複数放射状に突出した構造を有する分岐状(ラジアル型)スチレンブロック共重合体又はその水素添加物である。ただし、n=2の場合はリニア型となる。
上記芳香族アルケニル化合物としては、例えば、スチレン、tert-ブチルスチレン、α-メチルスチレン、p-メチルスチレン、p-エチルスチレン、ジビニルベンゼン、1,1-ジフェニルエチレン、ビニルナフタレン、ビニルアントラセン、N,N-ジエチル-p-アミノエチルスチレン、ビニルピリジン等が挙げられる。なかでも、工業的に入手しやすいことから、スチレンが好ましい。
上記Aで表される芳香族アルケニル重合体ブロックが、上記芳香族アルケニル化合物に由来する繰り返し単位以外の他の化合物に由来する繰り返し単位を含有する場合、このような他の化合物に由来する繰り返し単位を有するブロックは特に限定されず、例えば、共役ジエン重合体、エチレン重合体、プロピレン重合体等が挙げられる。
上記共役ジエン化合物としては、例えば、1,3-ブタジエン、イソプレン、2,3-ジメチル-1,3-ブタジエン、1,3-ペンタジエン、2-メチル-1,3-オクタジエン、1,3-ヘキサジエン、1,3-シクロヘキサジエン、4,5-ジエチル-1,3-オクタジエン、3-ブチル-1,3-オクタジエン、ミルセン、クロロプレン等が挙げられる。これらの共役ジエン化合物は、単独で用いてもよく、2種以上を併用してもよい。なかでも、重合反応性が高く、工業的に入手しやすいことから、1,3-ブタジエン、イソプレンが好ましい。
上記Bで表される共役ジエン重合体ブロックが、上記共役ジエン化合物に由来する繰り返し単位以外の他の化合物に由来する繰り返し単位を含有する場合、このような他の化合物に由来する繰り返し単位を有するブロックは特に限定されず、例えば、芳香族アルケニル重合体、エチレン重合体、プロピレン重合体等が挙げられる。
上記カップリング剤としては、ハロゲン化シラン、アルコキシシラン等のシラン化合物や、ハロゲン化スズ等のスズ化合物や、ポリカルボン酸エステル、エポキシ化大豆油等のエポキシ化合物や、ペンタエリスリトールテトラアクリレート等のアクリルエステルや、エポキシシラン、ジビニルベンゼン等のジビニル化合物等が挙げられる。より具体例には、例えば、トリクロロシラン、トリブロモシラン、テトラクロロシラン、テトラブロモシラン、メチルトリメトキシシラン、エチルトリメトキシシラン、ビニルトリメトキシシラン、ビニルトリエトキシシラン、テトラメトキシシラン、テトラエトキシシラン、テトラクロロスズ、ジエチルアジペート等が挙げられる。
なお、水素添加の比率(水素添加率)は、四塩化炭素を溶媒として用い、270MHzでの1H-NMRスペクトルから算出した水素添加率を意味する。
一方で、上記スチレン系エラストマー(I)100重量%に占める上記スチレンブロック共重合体又はその水素添加物(2)の含有量は、好ましい下限が50重量%、好ましい上限が85重量%であり、より好ましい下限が53重量%、より好ましい上限が72重量%である。
なお、ジブロック比率は、ゲル浸透クロマトグラフ(GPC)法により測定される各共重合体のピーク面積比から算出することができる。
なお、例えば、上記スチレン系エラストマー(I)の種類がSEBS型であるとは、上記スチレンブロック共重合体又はその水素添加物(1)、及び、上記スチレンブロック共重合体又はその水素添加物(2)が、スチレン由来の繰り返し単位と、エチレン由来の繰り返し単位と、ブチレン由来の繰り返し単位とを有することを意味する。即ち、上記Aで表される芳香族アルケニル重合体ブロックが、スチレン由来の繰り返し単位を有するブロックであり、上記Bで表される共役ジエン重合体ブロック(その水素添加物)が、エチレン由来の繰り返し単位と、ブチレン由来の繰り返し単位とを有するブロックであることを意味する。
まず、上記Aで表される芳香族アルケニル重合体ブロックを合成する工程(a)を行う。次いで、上記Aで表される芳香族アルケニル重合体ブロックに対して、共役ジエン化合物を重合することにより、一般式A-Bで表される構造を有するスチレンブロック共重合体(1)を合成する工程(b)を行う。次いで、得られた一般式A-Bで表される構造を有するスチレンブロック共重合体(1)を、カップリング剤を用いてカップリング反応させることにより、一般式A-B-A又は一般式(A-B)nCで表される構造を有するスチレンブロック共重合体(2)を得る工程(c)を行う。このときのカップリング率は特に限定されないが、上記ジブロック比率(上記スチレン系エラストマー(I)100重量%に占める上記スチレンブロック共重合体又はその水素添加物(1)の含有量)を上述した範囲に調整する観点から、好ましい下限は50%、好ましい上限は97%である。カップリング率のより好ましい下限は55%、より好ましい上限は95%であり、更に好ましい下限は58%、更に好ましい上限は90%であり、更により好ましい下限は60%、更により好ましい上限は85%である。必要に応じて、スチレンブロック共重合体(1)及びスチレンブロック共重合体(2)に対して水素添加を行う工程(d)を行う。
上記粘着付与樹脂として、例えば、脂肪族共重合体、芳香族共重合体、脂肪族芳香族共重合体、脂環式共重合体等の石油系樹脂、クマロン-インデン系樹脂、テルペン系樹脂、テルペンフェノール系樹脂、重合ロジン等のロジン系樹脂、(アルキル)フェノール系樹脂、キシレン系樹脂、及び、これらの水素添加物等が挙げられる。また、ポリオレフィン樹脂との混合物として市販されている粘着付与樹脂を用いてもよい。これらの粘着付与樹脂は、単独で用いてもよく、2種以上を併用してもよい。なかでも、経時又は高温下でも上記粘着剤層の粘着力が昂進しにくく、より糊残りなく剥離することができることから、上記粘着付与樹脂は、水素添加物であることが好ましい。
上記ポリプロピレン樹脂として、例えば、ホモポリプロピレン、ランダムポリプロピレン、ブロックポリプロピレン等が挙げられる。上記ポリエチレン樹脂として、例えば、高圧法低密度ポリエチレン、直鎖状低密度ポリエチレン、高密度ポリエチレン等が挙げられる。なかでも、透明性、剛性、耐熱性の観点からポリプロピレン樹脂が好ましく、ホモポリプロピレンが好ましい。また、ポリプロピレンとポリエチレンとの混合物も好ましい。
上記粘着剤層(表面保護フィルム)の成形条件を調整することで、上記60℃でのL成分の成分比率及び緩和時間、並びに、上記25℃でのL成分の成分比率及び緩和時間を上記範囲に調整しやすくなる。具体的には、共押出成形する方法の場合、予め2軸押出機を用いて、上記粘着剤層の原料を混練しコンパウンドペレット(粘着剤組成物)を作製しておくことが好ましい。そして、作製した粘着剤組成物を、シリンダーの根本温度100~150℃から先端温度200~230℃まで段階的に温度が上がるように設定した1軸押出機に投入し、上記粘着剤層を成形することが好ましい。また、金型、フィードブロック等の流路は200~230℃となるように調整されることが好ましい。必要以上に熱履歴を増やすような工程を加えたり、反対に原料が充分に混錬されないような工程(例えば、低温で原料をドライブレンド状態で押し出す工程等)を行ったりすると、上記60℃でのL成分の成分比率及び緩和時間、並びに、上記25℃でのL成分の成分比率及び緩和時間を上記範囲に調整できないことがある
実施例、比較例においては、表1に示した樹脂1~4をスチレン系エラストマーとして用いた。
なお、樹脂1~3の合成法は以下のとおりである。
(合成例1)
窒素置換された反応容器に、脱気、脱水されたシクロヘキサン500重量部、スチレン10重量部及びテトラヒドロフラン5重量部を仕込み、重合開始温度の40℃にてn-ブチルリチウム0.13重量部を添加して、昇温重合を行い、芳香族アルケニル重合体ブロック(ブロックA)を得た。
芳香族アルケニル重合体ブロックの重合転化率が略100%に達した後、反応液を15℃に冷却し、次いで、1,3-ブタジエン85重量部を加え、更に昇温重合を行い、共役ジエン重合体ブロック(ブロックB)を得た。これにより、一般式A-Bで表される構造を有するスチレンブロック共重合体(1)を得た。
重合転化率がほぼ100%に達した後、カップリング剤としてテトラクロロシランを加え、カップリング反応を行った。このときのカップリング率は70%であった。反応が完結した後、水素ガスを0.4MPa-Gaugeの圧力で供給しながら10分間放置した。これにより、一般式(A-B)4Cで表される構造を有するスチレンブロック共重合体(2)を得た。
一部取り出したポリマーについてGPC分析を行い、重量平均分子量(Mw)を求めた。
(合成例2~6)
スチレン含有量、カップリング反応におけるカップリング率、ジブロック比率等を表1に示したように変更したこと以外は樹脂1の合成(合成例1)と同様にして、スチレン系エラストマーを得た。
なお、カップリング率は、カップリング剤の種類、添加量等により調整できる。これにより、樹脂2~6においてはラジアル型のスチレン系エラストマーを得た。
DYNARON8300P(DR8300P)(スチレン-エチレンブチレン-スチレンブロック共重合体(SEBS)、JSR社製)
(1)表面保護フィルムの製造
基材層の原料として、ブロックポリプロピレン樹脂(J715M、プライムポリマー社製)を100重量部配合し、樹脂組成物を得た。
粘着剤層の原料として、スチレン系エラストマーとして樹脂1を100重量部、粘着付与樹脂として脂環族飽和炭化水素樹脂(P125、荒川化学工業社製、軟化点125℃、水添率は95%を超える)を15重量部配合し、混合物を得た。得られた混合物を2軸押出機を用いて押出し、押出されたストランドを水冷し、カットすることでΦ3mm程度のコンパウンド粘着剤組成物を得た。
基材層の原料として上記で得られた樹脂組成物を、粘着剤層の原料として上記で得られた粘着剤組成物を用い、Tダイ法により共押出成形を行った。根本温度150℃、先端温度230℃に調整されたΦ65mmの押出機に上記粘着剤組成物を、根本温度200℃、先端温度230℃に調整されたΦ115mm及びΦ75mmの押出機に上記樹脂組成物を投入し、ポリマーフィルター及びフィードブロックを介してマルチマニホールド型の金型から3層で共押出をした。押し出された樹脂は30℃に調整されたキャストロールによって冷却され、基材層35μm(Φ75mmの押出機由来の層の厚み8μm、Φ115mmの押出機由来の層の厚み27μm程度に押出量を調整)、粘着剤層3μmのフィルムとして成形された。フィルムは巻き取られ、ロール状の表面保護フィルを得た。
表面保護フィルムの粘着剤層の一部をトルエンに溶かし、自然乾燥した後、30℃で真空乾燥させてトルエンを除去することにより200mg程度の測定サンプルを調製した。
測定サンプルを直径10mmのガラス製のサンプル管(BRUKER社製、品番1824511、長さ180mm、フラットボトム)に導入した。サンプルをパルスNMR装置(the minispec mq20、BRUKER社製)に設置し、25℃で10分保持した後、Solid Echo法を行った。また、25℃で測定した後、昇温し、次いで、60℃で10分保持した後、60℃でCPMG法を行った。
得られた1H核のスピン-スピン緩和の自由誘導減衰曲線を、S成分、M成分及びL成分の3成分に由来する3つの曲線に波形分離し、S成分及びL成分の成分比率及び緩和時間を求めた。波形分離は、ガウシアン型とエクスポーネンシャル型との両方を用いて、フィッティングさせることで行った。
なお、BRUKER社製の解析ソフトウエア「TD-NMRA(Version 4.3 Rev 0.8)」を用い、製品マニュアルに従って、25℃でのSolid Echo法ではS成分はガウシアン型、M成分及びL成分はエクスポーネンシャル型を用いてフィッティングを行った。60℃でのCPMG法ではS成分、M成分及びL成分の全てについてエクスポーネンシャル型を用いてフィッティングを行った。また、Solid Echo法では得られた緩和曲線の0.6ミリ秒までのポイントを用いてフィッティングを行い、CPMG法では全てのポイントを用いてフィッティングを行った。フィッティングには以下の式を用いた。
[CPMG法]
Scans:256times
Recycle Delay:0.5sec又はT1の5倍の値
90-180 plus searation:0.4
Total number of acquired echoes:1000
Scans:128times
Recycle Delay:0.5sec又はT1の5倍の値
Acquisition scale:1ms
表2に示すようにスチレン系エラストマー又は粘着付与樹脂を変更したこと以外は実施例1と同様にして、表面保護フィルムを得た。実施例7ではスチレン系エラストマー及び粘着付与樹脂は実施例2と同じであったが、粘着剤組成物を投入する押出機をΦ45mmの押出機に変更し、押出機の根本温度を190℃、先端温度を230℃、キャストロールの温度を40℃に変更した。
実施例1~8、比較例1~6で得られた表面保護フィルムについて、以下の評価を行った。結果を表2に示した。
被着体(山の頂点間距離が24μmであるプリズムシート)上を覆うように25mm幅の表面保護フィルムを貼り付けて、試験片を作製した。貼り付けは、23℃及び相対湿度50%RHの環境下で、2kgの圧着ゴムローラーを用いて、300mm/分の速度で圧締することにより行った。
得られた試験片を23℃及び相対湿度50%RHの環境下で30分放置した。放置後、被着体から引張速度300mm/分で180°方向に表面保護フィルムを剥離し、初期粘着力を測定した。
ただし、比較例3では表面保護フィルムが被着体から浮いた状態となり、初期粘着力を測定することができなかった。
上記(1)と同様にして得られた試験片を50℃の温度環境下で1週間(1W)放置した。放置後、試験片を室温に取り出し、更に60分間放置した後、被着体から引張速度300mm/分で180°方向に表面保護フィルムを剥離し、50℃1週間(1W)後粘着力を測定した。
ただし、比較例1及び3では表面保護フィルムが被着体から浮いた状態となり、50℃1週間(1W)後粘着力を測定することができなかった。
初期粘着力測定結果から、以下の基準により判定を行った。
◎:6gf/25mm以上8gf/25mm以下
○:5gf/25mm以上6gf/25mm未満、又は、8gf/25mmよりも大きく12.5gf/25mm以下
△:4gf/25mm以上5gf/25mm未満、又は、12.5gf/25mmよりも大きく15gf/25mm以下
×:4gf/25mm未満、又は、15gf/25mmよりも大きい
また、50℃1週間(1W)後粘着力の測定結果から、以下の基準により判定を行った。
◎:6gf/25mm以上10gf/25mm以下
○:5gf/25mm以上6gf/25mm未満、又は、10gf/25mmよりも大きく15gf/25mm以下
△:4gf/25mm以上5gf/25mm未満、又は、15gf/25mmよりも大きく20gf/25mm以下
×:4gf/25mm未満、又は、20gf/25mmよりも大きい
上記(2)において被着体から表面保護フィルムを剥離した後、被着体を確認し、レーザー顕微鏡(キーエンス社製、VK-X100)にて糊残りの有無を評価した。以下の基準により評価した。
○:糊残りが見られなかった
×:糊残りが見られた
Claims (7)
- 基材層と粘着剤層とを有する表面保護フィルムであって、
前記粘着剤層は、パルスNMRを用いて60℃でCPMG法にて測定して得られたL成分の成分比率が10%以下、緩和時間が25ミリ秒以上、80ミリ秒以下であり、パルスNMRを用いて25℃でSolid Echo法にて測定して得られたL成分の成分比率が30%以上、65%以下、緩和時間が0.2ミリ秒以上、0.4ミリ秒以下である
ことを特徴とする表面保護フィルム。 - 前記粘着剤層は、パルスNMRを用いて60℃でCPMG法にて測定して得られたS成分の成分比率が45%以上、緩和時間が0.4ミリ秒以上、0.8ミリ秒以下であることを特徴とする請求項1記載の表面保護フィルム。
- 前記粘着剤層は、スチレン系エラストマーを含有することを特徴とする請求項1又は2記載の表面保護フィルム。
- 前記スチレン系エラストマーは、一般式A-Bで表される構造を有するスチレンブロック共重合体又はその水素添加物(1)と、一般式A-B-A又は一般式(A-B)nCで表される構造を有するスチレンブロック共重合体又はその水素添加物(2)とを含有するスチレン系エラストマー(I)であり、
前記スチレン系エラストマー(I)100重量%に占める前記スチレンブロック共重合体又はその水素添加物(1)の含有量は、15重量%以上、50重量%以下であり、
前記スチレン系エラストマー(I)100重量%に占める前記スチレンブロック共重合体又はその水素添加物(2)の含有量は、50重量%以上、85重量%以下である
ことを特徴とする請求項3記載の表面保護フィルム。
A:芳香族アルケニル重合体ブロック
B:共役ジエン重合体ブロック
C:カップリング剤に由来する成分
n:2以上の整数 - 前記粘着剤層は、更に、粘着付与樹脂を含有し、前記粘着付与樹脂の含有量は、前記スチレン系エラストマー100重量部に対して12重量部以上、45重量部以下であることを特徴とする請求項3又は4記載の表面保護フィルム。
- 前記スチレン系エラストマー(I)においてnが4であることを特徴とする請求項4記載の表面保護フィルム。
- 前記粘着剤層は、パルスNMRを用いて60℃でCPMG法にて測定して得られたL成分の成分比率が6.5%以下、緩和時間が30ミリ秒以上、70ミリ秒以下であることを特徴とする請求項1、2、3、4、5又は6記載の表面保護フィルム。
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JP2003342441A (ja) * | 1998-05-13 | 2003-12-03 | Nippon Zeon Co Ltd | ブロック共重合体組成物、その製造方法及び粘着剤組成物 |
JP2010214853A (ja) * | 2009-03-18 | 2010-09-30 | Sekisui Chem Co Ltd | プリズムシート用表面保護シート |
JP2017120427A (ja) * | 2015-12-28 | 2017-07-06 | 積水化学工業株式会社 | プリズムシート用表面保護フィルム及びプリズムシート用表面保護フィルム付きプリズムシート |
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JPH0812952A (ja) | 1994-06-28 | 1996-01-16 | Sekisui Chem Co Ltd | 表面保護フイルム |
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JP2010214853A (ja) * | 2009-03-18 | 2010-09-30 | Sekisui Chem Co Ltd | プリズムシート用表面保護シート |
JP2017120427A (ja) * | 2015-12-28 | 2017-07-06 | 積水化学工業株式会社 | プリズムシート用表面保護フィルム及びプリズムシート用表面保護フィルム付きプリズムシート |
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