WO2022208814A1 - Pressure-sensitive adhesive composition and pressure-sensitive adhesive tape - Google Patents
Pressure-sensitive adhesive composition and pressure-sensitive adhesive tape Download PDFInfo
- Publication number
- WO2022208814A1 WO2022208814A1 PCT/JP2021/014048 JP2021014048W WO2022208814A1 WO 2022208814 A1 WO2022208814 A1 WO 2022208814A1 JP 2021014048 W JP2021014048 W JP 2021014048W WO 2022208814 A1 WO2022208814 A1 WO 2022208814A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- adhesive composition
- pressure
- sensitive adhesive
- cross
- adhesive
- Prior art date
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- 239000000203 mixture Substances 0.000 title claims abstract description 74
- 239000004820 Pressure-sensitive adhesive Substances 0.000 title claims abstract description 53
- 239000000853 adhesive Substances 0.000 claims abstract description 88
- 230000001070 adhesive effect Effects 0.000 claims abstract description 83
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 41
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 40
- 229920001194 natural rubber Polymers 0.000 claims abstract description 40
- 238000004132 cross linking Methods 0.000 claims abstract description 36
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 26
- 229920005989 resin Polymers 0.000 claims abstract description 20
- 239000011347 resin Substances 0.000 claims abstract description 20
- 239000002390 adhesive tape Substances 0.000 claims description 23
- -1 isocyanate compound Chemical class 0.000 claims description 22
- 239000012790 adhesive layer Substances 0.000 claims description 19
- 150000001875 compounds Chemical class 0.000 claims description 19
- 239000012948 isocyanate Substances 0.000 claims description 14
- 239000003607 modifier Substances 0.000 claims description 13
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 239000011593 sulfur Substances 0.000 claims description 7
- 239000003208 petroleum Substances 0.000 claims description 5
- HIFVAOIJYDXIJG-UHFFFAOYSA-N benzylbenzene;isocyanic acid Chemical group N=C=O.N=C=O.C=1C=CC=CC=1CC1=CC=CC=C1 HIFVAOIJYDXIJG-UHFFFAOYSA-N 0.000 claims description 3
- 150000002989 phenols Chemical class 0.000 claims description 3
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- 150000002736 metal compounds Chemical class 0.000 claims description 2
- 150000003918 triazines Chemical class 0.000 claims description 2
- 150000003018 phosphorus compounds Chemical class 0.000 claims 1
- 239000010410 layer Substances 0.000 abstract description 29
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- 239000000758 substrate Substances 0.000 abstract description 11
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- 238000000576 coating method Methods 0.000 abstract description 9
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- 150000002739 metals Chemical class 0.000 abstract description 7
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- 238000011109 contamination Methods 0.000 description 12
- 230000014759 maintenance of location Effects 0.000 description 10
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 125000000524 functional group Chemical group 0.000 description 8
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- 238000001035 drying Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
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- 239000004743 Polypropylene Substances 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
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- 238000011156 evaluation Methods 0.000 description 4
- 150000002978 peroxides Chemical class 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
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- 239000002904 solvent Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 4
- 238000004073 vulcanization Methods 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920003049 isoprene rubber Polymers 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
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- 229920000642 polymer Polymers 0.000 description 3
- 102000004169 proteins and genes Human genes 0.000 description 3
- 108090000623 proteins and genes Proteins 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
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- 229960002447 thiram Drugs 0.000 description 3
- 150000003755 zirconium compounds Chemical class 0.000 description 3
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 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
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004793 Polystyrene Substances 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
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 2
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- 230000007423 decrease Effects 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 2
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- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 125000001841 imino group Chemical group [H]N=* 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 150000002632 lipids Chemical class 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
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- 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
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 1
- VNQNXQYZMPJLQX-UHFFFAOYSA-N 1,3,5-tris[(3,5-ditert-butyl-4-hydroxyphenyl)methyl]-1,3,5-triazinane-2,4,6-trione Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CN2C(N(CC=3C=C(C(O)=C(C=3)C(C)(C)C)C(C)(C)C)C(=O)N(CC=3C=C(C(O)=C(C=3)C(C)(C)C)C(C)(C)C)C2=O)=O)=C1 VNQNXQYZMPJLQX-UHFFFAOYSA-N 0.000 description 1
- LEVFXWNQQSSNAC-UHFFFAOYSA-N 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexoxyphenol Chemical compound OC1=CC(OCCCCCC)=CC=C1C1=NC(C=2C=CC=CC=2)=NC(C=2C=CC=CC=2)=N1 LEVFXWNQQSSNAC-UHFFFAOYSA-N 0.000 description 1
- OLFNXLXEGXRUOI-UHFFFAOYSA-N 2-(benzotriazol-2-yl)-4,6-bis(2-phenylpropan-2-yl)phenol Chemical compound C=1C(N2N=C3C=CC=CC3=N2)=C(O)C(C(C)(C)C=2C=CC=CC=2)=CC=1C(C)(C)C1=CC=CC=C1 OLFNXLXEGXRUOI-UHFFFAOYSA-N 0.000 description 1
- VQMHSKWEJGIXGA-UHFFFAOYSA-N 2-(benzotriazol-2-yl)-6-dodecyl-4-methylphenol Chemical compound CCCCCCCCCCCCC1=CC(C)=CC(N2N=C3C=CC=CC3=N2)=C1O VQMHSKWEJGIXGA-UHFFFAOYSA-N 0.000 description 1
- IMSODMZESSGVBE-UHFFFAOYSA-N 2-Oxazoline Chemical compound C1CN=CO1 IMSODMZESSGVBE-UHFFFAOYSA-N 0.000 description 1
- VFBJXXJYHWLXRM-UHFFFAOYSA-N 2-[2-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]ethylsulfanyl]ethyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCCSCCOC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 VFBJXXJYHWLXRM-UHFFFAOYSA-N 0.000 description 1
- GAODDBNJCKQQDY-UHFFFAOYSA-N 2-methyl-4,6-bis(octylsulfanylmethyl)phenol Chemical compound CCCCCCCCSCC1=CC(C)=C(O)C(CSCCCCCCCC)=C1 GAODDBNJCKQQDY-UHFFFAOYSA-N 0.000 description 1
- HCILJBJJZALOAL-UHFFFAOYSA-N 3-(3,5-ditert-butyl-4-hydroxyphenyl)-n'-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyl]propanehydrazide Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)NNC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 HCILJBJJZALOAL-UHFFFAOYSA-N 0.000 description 1
- KLYXSBJEGDYGDG-UHFFFAOYSA-N 3-[1-(3,5-ditert-butyl-4-hydroxyphenyl)-2-methylbutan-2-yl]oxy-3-oxo-2,2-bis(1,2,2,6,6-pentamethylpiperidin-4-yl)propanoic acid Chemical compound C1C(C)(C)N(C)C(C)(C)CC1C(C(O)=O)(C1CC(C)(C)N(C)C(C)(C)C1)C(=O)OC(C)(CC)CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 KLYXSBJEGDYGDG-UHFFFAOYSA-N 0.000 description 1
- QRLSTWVLSWCGBT-UHFFFAOYSA-N 4-((4,6-bis(octylthio)-1,3,5-triazin-2-yl)amino)-2,6-di-tert-butylphenol Chemical compound CCCCCCCCSC1=NC(SCCCCCCCC)=NC(NC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=N1 QRLSTWVLSWCGBT-UHFFFAOYSA-N 0.000 description 1
- VSAWBBYYMBQKIK-UHFFFAOYSA-N 4-[[3,5-bis[(3,5-ditert-butyl-4-hydroxyphenyl)methyl]-2,4,6-trimethylphenyl]methyl]-2,6-ditert-butylphenol Chemical group CC1=C(CC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)C(C)=C(CC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)C(C)=C1CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 VSAWBBYYMBQKIK-UHFFFAOYSA-N 0.000 description 1
- ZVVFVKJZNVSANF-UHFFFAOYSA-N 6-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]hexyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCCCCCCOC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 ZVVFVKJZNVSANF-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- NOWKCMXCCJGMRR-UHFFFAOYSA-N Aziridine Chemical compound C1CN1 NOWKCMXCCJGMRR-UHFFFAOYSA-N 0.000 description 1
- 229920002799 BoPET Polymers 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-M Carbamate Chemical compound NC([O-])=O KXDHJXZQYSOELW-UHFFFAOYSA-M 0.000 description 1
- 239000004971 Cross linker Substances 0.000 description 1
- MUXOBHXGJLMRAB-UHFFFAOYSA-N Dimethyl succinate Chemical compound COC(=O)CCC(=O)OC MUXOBHXGJLMRAB-UHFFFAOYSA-N 0.000 description 1
- 241001441571 Hiodontidae Species 0.000 description 1
- OKOBUGCCXMIKDM-UHFFFAOYSA-N Irganox 1098 Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)NCCCCCCNC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 OKOBUGCCXMIKDM-UHFFFAOYSA-N 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
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- 150000001412 amines Chemical class 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
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- OCWYEMOEOGEQAN-UHFFFAOYSA-N bumetrizole Chemical compound CC(C)(C)C1=CC(C)=CC(N2N=C3C=C(Cl)C=CC3=N2)=C1O OCWYEMOEOGEQAN-UHFFFAOYSA-N 0.000 description 1
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- 239000007822 coupling agent Substances 0.000 description 1
- MCPKSFINULVDNX-UHFFFAOYSA-N drometrizole Chemical compound CC1=CC=C(O)C(N2N=C3C=CC=CC3=N2)=C1 MCPKSFINULVDNX-UHFFFAOYSA-N 0.000 description 1
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- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
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- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 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
- C09J107/00—Adhesives based on natural rubber
-
- 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
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- 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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
-
- 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 an adhesive composition using natural rubber as a main component, which has a high degree of cross-linking, excellent cohesiveness and self-adhesive surface adhesiveness, and can be used for various adherends such as metals, resins, and coating materials. It relates to an adhesive composition having excellent adhesive strength, high temperature retention, and removability against. In addition, the present invention uses the above-mentioned adhesive composition, has a strong fixing force required in the manufacturing / assembly stage and transportation stage of the article, has little contamination of the adherend when re-peeled, and is easy to peel temporarily fixed. relating to adhesive tapes suitable for
- Adhesive tapes are used for masking, reinforcing, protecting, and identifying industrial products such as information equipment, office equipment, home appliances, and interiors during manufacturing and assembly, as well as for preventing damage during transportation after manufacturing and as a packing aid. is directly attached and is torn off after the purpose is achieved. Therefore, such an adhesive tape for temporary fixing has excellent fixing power (adhesive strength, high temperature retention) to the adherend and does not stain the adherend when peeled (also called re-peeling). A contradictory performance is required with less (removability).
- Adhesives suitable for temporary fixing adhesive tapes used for this purpose include acrylic and rubber adhesives from the viewpoint of performance and price.
- Patent Document 1 describes a pressure-sensitive adhesive layer obtained by curing an isoprene-based rubber and a tackifier with a curing agent in the presence of a zirconium compound.
- Patent Document 2 an undercoat layer made of a composition containing a rubber component made of natural rubber obtained by polymerizing methyl methacrylate, an isocyanate compound, and an aminoethylated acrylic resin is provided between a rubber-based pressure-sensitive adhesive layer and a substrate.
- Patent Document 3 describes pressure-sensitive adhesive sheets provided with a layer comprising a solid-type pressure-sensitive adhesive composition obtained by adding a tackifier to a rubbery polymer and cross-linking with an isocyanate-based cross-linking agent.
- Patent Document 1 the use of an organic zirconium compound as the zirconium compound and the curing with an isocyanate-based curing agent as the curing agent are said to increase the cohesive force of the pressure-sensitive adhesive. Since the fraction is low (17 to 30%) and the measurement conditions are moderate, it is expected that the high-temperature holding power and adhesive residue property, which are the objectives of the present invention, will be inferior.
- the adhesive layer comprises an elastomer containing 50 to 80 parts by weight of natural rubber and 20 to 45 parts by weight of isoprene rubber having a peroxide in the molecule, and 50 to 100 parts by weight of a tackifying resin. and 0.1 to 15 parts by weight of a cross-linking agent, and when combined with the above-mentioned specific undercoat layer, it has a strong adhesive force and leaves adhesive residue on the adherend when the tape is peeled off. contamination is significantly suppressed.
- the addition of liquid isoprene rubber containing peroxides in the molecule eliminates the use of sulfur and peroxides, which are commonly used in natural rubber cross-linking (vulcanization).
- the cross-linking in the environment becomes possible.
- an epoxy resin, an isocyanate resin, or the like is used as a cross-linking agent
- the epoxy resin is preferably used (paragraph 0023).
- an isocyanate compound is used in the undercoat layer
- the cross-linking agent for the adhesive layer is an epoxy system
- the adhesive layer is not only pure natural rubber but also a liquid rubber having a peroxide in the molecule. It is crosslinked using isoprene rubber.
- the pass/fail of the gel fraction is set as low as 20%, and the pass/fail of the retention force measurement conditions is also low.
- the adhesive composition of Patent Document 3 is a solvent-free solid type composition obtained by adding a tackifier and an isocyanate-based cross-linking agent to a rubbery polymer made of natural rubber, heating and kneading at 80 to 120 ° C. and simultaneously cross-linking. It is a thing. By devising a heat-kneading method, even a solid type using an isocyanate-based cross-linking agent can achieve moderately weak cross-linking, increasing cohesion while maintaining adhesive strength. It is said that it became possible to disperse evenly without causing liquefaction. However, in Patent Document 3, an adhesive force test by peeling at 23° C. and a holding force test by a load of 2 kg at 40° C. are conducted, but properties at higher temperatures are not evaluated.
- the purpose of the present invention is to provide a rubber-based adhesive composition that has excellent adhesive strength, high-temperature retention, and low staining properties for various adherends including metals, resins, and coating materials.
- the present invention uses a rubber-based adhesive, and even if it is exposed to a high temperature or a hot and humid environment in the manufacturing / assembly stage or transportation stage of the article, the adherend after re-peeling is less contaminated, and the tape is re-peelable. It is easy to peel off because the end of the tape can be folded back to the adhesive side as a handle, and it has excellent adhesive strength, so it can be used to temporarily fix items even with a narrow width.
- An object of the present invention is to provide a fixing adhesive tape.
- a pressure-sensitive adhesive composition according to one aspect of the present invention is a pressure-sensitive adhesive composition containing natural rubber, a cross-linking agent, a tackifier, and a cross-linking modifier, and the minimum temperature of the loss tangent after curing of the pressure-sensitive adhesive composition is 78.7. C. or higher, the minimum value is 0.20 or less, and the maximum temperature of the loss tangent is 25.0.degree. C. or less and the maximum value is 1.15 or less.
- a pressure-sensitive adhesive tape according to another aspect of the present invention is a pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition on at least one surface of a sheet-like base material.
- a rubber-based pressure-sensitive adhesive composition having excellent adhesive strength, high-temperature retention, and removability (low contamination) to various adherends including metals, resins, and coating materials. is provided.
- a temporary fixing adhesive that has a strong fixing force required in the manufacturing / assembling stage and the transportation stage of an article, has less contamination of the adherend when removed again, and is easy to peel off.
- the pressure-sensitive adhesive composition according to the present embodiment is a pressure-sensitive adhesive composition containing natural rubber, a cross-linking agent, a tackifier, and a cross-linking modifier.
- the minimum value is 0.20 or less, and the maximum temperature of the loss tangent is 25.0° C. or less and the maximum value is 1.15 or less.
- the minimum temperature of the loss tangent after curing of the adhesive composition is 78.7 ° C. or higher, the minimum value of the degree of contribution to the loss elastic modulus (viscosity) is small, and the cured product made of the adhesive composition is a predetermined In other words, the pressure-sensitive adhesive layer made of the present pressure-sensitive adhesive composition maintains appropriate hardness even at relatively high temperatures.
- the minimum loss tangent temperature is less than 78.7° C., the holding power at high temperatures is poor.
- the fact that the minimum value of the loss tangent after curing of the adhesive composition is 0.20 or less indicates that the cured product (adhesive layer) of the adhesive composition is unlikely to become excessively soft and difficult to flow. .
- the maximum temperature of the loss tangent indicates the glass transition temperature, and the fact that the maximum temperature of the loss tangent of the present adhesive composition is 25.0 ° C. or less means that the cured product of the present adhesive composition has a low glass transition temperature and a low temperature. However, it shows that moderate flexibility is maintained.
- the maximum value of the loss tangent indicates the peel resistance, and the maximum value of the loss tangent of the cured product of the adhesive composition is 1.15 or less, so that the peel resistance when used as an adhesive layer is small. It shows that the adhesive tape using the object is easy to peel off.
- Natural rubber is obtained by coagulating and drying natural rubber latex, which is the sap of rubber trees, and is a substance composed mainly of cis-1,4-polyisoprene.
- one end of a cis-1,4-isoprene unit is composed of a protein end, a phosphate lipid is bound to the other end, and a long-chain fatty acid is further attached to the phosphate lipid end. It is said to be a bonded structure.
- natural rubber contains 3 to 4% by mass of non-rubber components such as proteins and lipids. Therefore, natural rubber can be easily crosslinked and cured with a crosslinking agent, which will be described later.
- the adhesive composition according to the present invention is crosslinked and cured, the crosslinked product is also referred to as a cured product.
- Classifications of the natural rubber used include, for example, Standard Malaysian Rubber (SMR), Standard Indonesian Rubber (SIR), Ribbed Smoked Sheet (RSS) Nos. 1-6, and Pale Crepe Nos. 1-3.
- unmasticated natural rubber has a very high molecular weight. If the molecular weight of the natural rubber is too high, the plasticity of the natural rubber is high and the pressure-sensitive adhesive composition lacks flexibility, making it difficult to obtain appropriate pressure-sensitive adhesive properties. may not be possible. Therefore, it is necessary to mechanically masticate natural rubber in advance using a pressure kneader, a Banbury mixer, an open roll, or the like, to moderately reduce the molecular weight of the natural rubber and adjust the plasticity, and use it for compounding.
- the plasticity of the natural rubber used in the adhesive composition of the present invention is preferably 10-85, more preferably 20-35 in Mooney viscosity ML 1+4 (100° C.). If the plasticity is too low or too high, it may not be possible to obtain a pressure-sensitive adhesive composition and pressure-sensitive adhesive tape that have both excellent adhesive strength and high cohesive strength required for temporary fixing of articles.
- Known methods for cross-linking natural rubber include a vulcanization treatment method using a vulcanizing agent and a cross-linking method by reaction between functional groups.
- a sulfur-based, thiuram-based, or quinoid-based vulcanizing agent acts on the unsaturated bonds contained in the molecular main chain of natural rubber, and the reaction mechanism is such that the polymers are directly crosslinked. Dense and strong cross-linking with a large cohesive force can be realized.
- sulfur is known to be a component that may corrode metals, and is not preferable for temporary fixing applications in which it is directly attached to various adherends including metals, resins, and coating materials.
- cross-linking agent containing, for example, an isocyanate-based compound, an epoxy-based compound, an oxazoline-based compound, an aziridine-based compound, a butylated melamine compound, etc. can be used as the cross-linking agent.
- non-sulfur cross-linking agent which is not a vulcanizing agent, does not contain sulfur, which is a concern for metal corrosion. more preferred.
- the present inventors have found that if natural rubber can be flexibly and densely crosslinked, it will have excellent adhesive strength required for temporary fixing of articles, high cohesive strength, and excellent high temperature retention and removability. We thought we could provide a rubber-based adhesive. In order to achieve this purpose, based on the above common technical knowledge, a cross-linking agent characterized by being non-sulfur and capable of high cross-linking was examined by trial and error. .
- the present inventors have found that by using a cross-linking agent containing an isocyanate-based compound as a main component, among the cross-linking agents described above, a pressure-sensitive adhesive composition having excellent adhesive strength required for temporarily fixing natural rubber to an article can be obtained. It was discovered that the material can be flexibly and densely crosslinked.
- the cross-linking agent used in the pressure-sensitive adhesive composition and pressure-sensitive adhesive sheet of the present invention contains an isocyanate compound as a main component, particularly at least one selected from those containing a diphenylmethane diisocyanate structure as a main component. can preferably be used.
- the cross-linking agent can be used by adding 1 to 15 parts by mass, preferably 2.5 to 10 parts by mass, per 100 parts by mass of natural rubber. Each characteristic of the loss tangent described above can be satisfied by using the amount within this range.
- a tackifying resin having good compatibility with natural rubber can be used as a tackifier, particularly a group consisting of petroleum-based resins, terpene resins, rosin resins, and other resins having a softening point of 125 ° C. or higher. At least one more selected resin can be used. In particular, petroleum-based resins (saturated aliphatic hydrocarbon resins) having a softening point of 125° C. or higher are preferred. Such a tackifier can be used by adding 50 to 100 parts by weight, preferably 60 to 90 parts by weight, to 100 parts by weight of natural rubber.
- a pressure-sensitive adhesive composition and a pressure-sensitive adhesive tape having excellent adhesive strength high-temperature retention and removability required for temporary fixing of articles when a tackifying resin having a softening point lower than 125°C is used as a tackifier. may not be possible.
- the amount of the tackifier added is too large or too small, it may not be possible to obtain the adhesive composition and the adhesive tape having the above physical properties.
- the degree of crosslinking (degree of gelation) of the composition is adjusted by using a crosslinking regulator.
- a crosslinking regulator This is used for the purpose of realizing a moderately flexible and dense cross-linking reaction within a range in which both excellent adhesive strength of the adhesive composition and high cohesive strength and high-temperature holding power can be achieved.
- a compound that inhibits to some extent the reaction between the isocyanate compound as the cross-linking agent and the hydroxyl groups of natural rubber is used as the cross-linking modifier.
- hindered phenol compounds include pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,2'-thiodiethylbis[3-( 3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 3-(4′-hydroxy-3′,5′-di-tert-butylphenyl)propionate-n-octadecyl, N,N′ -(hexane-1,6-diyl)bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanamide], octyl-3,5-di-tert-butyl-4-hydroxy- hydrocincinic acid, 2,4,6-tris(3′,5′-di-tert-butyl-4′-hydroxybenzyl)mesitylene, 2,4-bis(octylthiomethyl)
- phosphorus-based compounds include tris(2,4-di-tert-butylphenyl) phosphite.
- metal compounds include 3-(3,5-di-tert-butyl-4-hydroxyphenyl)-N′-[3-(3,5-di-tert-butyl-4-hydroxy Phenyl)propanoyl]propane hydrazide.
- benzotriazole compounds include 4-methyl-2-(2H-benzotriazol-2-yl)phenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1 -methyl-1-phenylethyl)phenol, 2-(5-chloro-2H-benzotriazol-2-yl)-6-(1,1-dimethylethyl)-4-methylphenol, 2,2′-methylenebis[ 6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol], benzotriazolyldodecyl P-cresol.
- triazine compounds include 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-(hexyloxy)phenol.
- hindered amine compounds include poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-S-triazine-2,4-diyl]-[(2,2, 6,6-tetramethyl-4-piperidyl)imino]-hexamethylene-[(2,2,6,6-tetramethyl-4-piperidyl)imino], dimethyl succinate 1-(2hydroxyethyl)-4 -hydroxy-2,2,6,6-tetramethyl-4-piperidine polycondensate, 2-[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]-2-butyl Bis[1,2,2,6,6-pentamethyl-4-piperidinyl]propanedioate, bis(1,2,2,6,6-pentamethyl-4
- the amount of the cross-linking modifier is not particularly set, but if the amount of the cross-linking modifier added is too large, the natural rubber cannot be cross-linked flexibly and densely, and the adhesive strength and adhesive strength required for temporary fixing of articles cannot be obtained. In some cases, it may not be possible to obtain a PSA composition and PSA tape that achieve both high cohesive strength and high temperature retention. On the other hand, if the amount is too small, the effect of adding the cross-linking modifier may not be sufficiently exhibited. It is preferably 1.0 parts by mass or more and 5.0 parts by mass or less, more preferably 2.0 parts by mass or more and 4.0 parts by mass or less with respect to 100 parts by mass of natural rubber.
- the adhesive composition may contain inorganic fillers, organic fillers such as resins, softeners, plasticizers, surfactants, coupling agents, colorants, One or more of preservatives, heat stabilizers, light stabilizers, etc. may be further added.
- organic fillers such as resins, softeners, plasticizers, surfactants, coupling agents, colorants, One or more of preservatives, heat stabilizers, light stabilizers, etc. may be further added.
- the term "adhesive composition” means both a mixture of components before cross-linking and a composition after cross-linking. , in which case “adhesive composition” means the composition after cross-linking.
- the state of dissolving or dispersing in a solvent to form an adhesive layer, and the dried product obtained by removing the solvent may also be referred to as the "adhesive composition”.
- the pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive tape in which a pressure-sensitive adhesive layer comprising the pressure-sensitive adhesive composition is formed on at least one surface of a sheet-like base material.
- a single-sided adhesive tape having an adhesive layer 12 made of the adhesive composition on one side of a substrate 11, or an adhesive provided on both sides of a substrate 21 as shown in FIG. It is a double-sided tape using the above adhesive composition for at least one of the layer 22 and the adhesive layer 23, or both.
- a coating liquid is prepared by mixing and dissolving a natural rubber, a cross-linking agent, a tackifier, a cross-linking modifier, and other additives in a solvent such as toluene. Coat one side or both sides of the base material 21 using a coater or the like so that the thickness of the adhesive layer after drying is uniform, and then dry and cure the coated adhesive composition at a predetermined temperature. formed by
- the thickness of the adhesive layer after drying and curing is not particularly limited, and exhibits excellent adhesive strength, self-adhesive surface adhesiveness, cohesive strength, and high temperature retention required for temporary fixing of articles. Any thickness may be used, but the thickness is usually about 10 to 70 ⁇ m, preferably 25 to 50 ⁇ m.
- the surface (surface 11A) of the sheet-like base material 11 in FIG. can improve the adhesion of the pressure-sensitive adhesive layer 12 to the substrate 11 .
- by providing a release layer on the surface 11B opposite to the surface 11A of the sheet-like base material 11 in FIG. While preventing the adhesive composition from adhering to the surface 11B of the base material 11, it is possible to maintain ease of unwinding (pulling out).
- both sides (21A and 21B) of the sheet-shaped base material 21 in FIG. 2, or one side thereof, may be subjected to surface treatment such as corona discharge treatment, an undercoat layer, or both. By doing so, the adhesion between the adhesive layer 22 or the adhesive layer 23 and the substrate 21 can be improved.
- the type of the sheet-shaped substrate is not particularly limited, and any sheet-shaped substrate such as commonly used known films, foams, woven fabrics, knitted fabrics, and non-woven materials such as paper may be used.
- resin-made film substrates are preferable, and resin materials such as polyethylene (PE), polypropylene (PP), oriented polypropylene (OPP), polyester, polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyethylene naphthalate (PEN ), polyphenylene sulfide, ethylene-vinyl acetate copolymer (EVA), and blends thereof.
- a film made of such a synthetic resin is excellent in mechanical strength and does not cause contamination of adherends, and is preferable as an adhesive tape for temporary fixing used in the manufacturing/assembling stage and transportation stage of articles.
- the thickness of the sheet-like base material can be appropriately selected and used within a range in which the strength required for the adhesive tape can be maintained. is more preferred. Especially in the case of polyethylene terephthalate (PET) film in that thickness range, it has excellent mechanical strength, exerts high fixing force, does not cause contamination of adherends, and can be used in the manufacturing / assembly stage and transportation stage of articles. It is more preferable as an adhesive tape for temporary fixing.
- PET polyethylene terephthalate
- ⁇ Undercoat> There are no particular limitations on the undercoat agent used in the undercoat layer, and any agent may be used as long as it exhibits its effect. In particular, if it has a functional group that can react with the functional group of the compound contained in the pressure-sensitive adhesive layer, the undercoat layer will also react during the cross-linking to form the pressure-sensitive adhesive layer, resulting in adhesion to the substrate. can increase power.
- the coating weight or basis weight of the undercoat layer after drying is generally 0.2 to 2 g/m 2 , preferably 0.4 to 1.2 g/m 2 .
- the release agent used in the release layer is not particularly limited, and any agent may be used as long as it exhibits its effect.
- silicone resins, long-chain alkylvinyl monomer polymers, fluorinated alkylvinyl monomer polymers, polyvinyl alcohol carbamate, and the like are known. Among these, the silicone resin is excellent in the property of improving the release performance of the base material surface.
- the adhesion amount or basis weight of the release layer after drying is generally 0.2 to 2 g/m 2 , preferably 0.4 to 1.2 g/m 2 .
- ⁇ Release sheet> In the case of the double-sided pressure-sensitive adhesive tape as shown in FIG. 2, it is preferable in terms of handleability to laminate a release sheet on the outer surface of the pressure-sensitive adhesive layer in a peelable manner. Moreover, in the case of winding in a roll shape, the adhesive layer 22 and the adhesive layer 23 can be wound with a release sheet sandwiched therebetween. Since the release sheet does not require much high strength, a sheet having one or both sides subjected to the release treatment as described above can be used.
- Petroleum resin, softening point 140°C ⁇ 5°C C Product name "Arcon P-100", manufactured by Arakawa Chemical Industries, Ltd. Petroleum resin, softening point 100°C ⁇ 5°C Crosslinking modifier: trade name "Irganox 1010", manufactured by BASF Japan, (Hindered phenol compound)
- Adhesive compositions were prepared at the compounding ratios shown in Table 1 (Tables 1-1 and 1-2), and dissolved and mixed in toluene to prepare coating solutions.
- Undercoat agent polymethyl methacrylate grafted natural rubber (manufactured by Malaysian Rubber Research Institute, trade name “MG30”) and cyclized rubber (manufactured by UCB Japan, trade name “ALPEX CK-450”) is applied to one surface of the base material.
- a pressure-sensitive adhesive tape having a single-sided pressure-sensitive adhesive layer as shown in FIG. 1 was produced by applying the composition to a layer thickness of 32 ⁇ m, drying at 110° C. and cross-linking.
- the minimum side (minimum temperature of 78.7 ° C. or higher and the minimum value of 0.20 or less) and the maximum side (maximum temperature of 25 ° C. or less and the maximum value of 1.15 or less) satisfy the specified range. "Y" for the case, and "N” for the case not satisfied.
- Apparatus manufactured by TA Instruments, trade name "ARESRDA-III" Frequency: 10.0Hz Temperature: -60 to 200°C Temperature rise: 10°C/min Strain: 0.1%
- Adhesive strength was measured using a test method based on JIS Z 0237:2000.
- PS polystyrene
- PP polypropylene
- PC polycarbonate
- rough PC matted on one side, manufactured by Takiron C.I., trade name "PCSP K6600”
- glass SUS plate (# SUS304 plate polished until the surface is uniform with 280 water-resistant abrasive paper)
- Al plate acrylic-coated plate (SPCC-SB acrylic-coated plate manufactured by Nippon Steel Corporation (Paint: "New Acrotze Black Glossy” manufactured by Dainippon Toryo Co., Ltd.) Yes”)) was used.
- the adhesive strength of the adhesive composition in the present embodiment is preferably, for example, 2.0 N/10 mm or more and 8 N/10 mm or less. A”, one adherend is out of range but other adherends can maintain this range "B”, two or more adherends are out of this range was rated "C”.
- Adherend staining property Attach an adhesive tape to each adherend used to measure adhesive strength, leave it in an atmosphere of 65 ° C. and 85% RH for 7 days or more, then leave it in an atmosphere of 5 ° C. for 2 hours or more to cool, and cool it in an atmosphere of 5 ° C. , the adhesive tape was manually peeled off from the adherend, and the presence or absence of adhesive residue or contamination on the adherend was visually examined. "A” indicates no adhesive residue, tape traces, or contamination; "B” indicates almost no adhesive residue, tape traces, or contamination; was determined as "C".
- rank A and 2 or less rank B is "A”
- rank A and 3 or 4 rank B is “B”
- rank A and 5 rank B "C” was evaluated, and "D” was evaluated when rank D was included.
- Comparative Examples 1, 2, and 7 to 12 as shown in Table 2-2, the adhesive strength was excellent, but the high temperature holding power was poor. Comparative Examples 3 and 4 were excellent in high-temperature holding power, but inferior in adhesive strength. Comparative Examples 5 and 6 were inferior in both adhesive strength and high temperature holding power. In addition, all of the comparative examples included a case where the adherend staining property was ranked D, and the versatility was low.
- the adhesive tape of the present invention is a highly versatile adhesive tape as an adhesive tape for temporary fixing, having excellent adhesive strength to various adherends (articles) and exhibiting low contamination.
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Abstract
Description
また本発明は、上記粘着組成物を使用し、物品の製造・組立段階や輸送段階において要求される強い固定力を有し、再剥離した場合に被着体の汚染が少なく、剥がしやすい仮固定に適した粘着テープに関する。 The present invention relates to an adhesive composition using natural rubber as a main component, which has a high degree of cross-linking, excellent cohesiveness and self-adhesive surface adhesiveness, and can be used for various adherends such as metals, resins, and coating materials. It relates to an adhesive composition having excellent adhesive strength, high temperature retention, and removability against.
In addition, the present invention uses the above-mentioned adhesive composition, has a strong fixing force required in the manufacturing / assembly stage and transportation stage of the article, has little contamination of the adherend when re-peeled, and is easy to peel temporarily fixed. relating to adhesive tapes suitable for
また、テープを剥がしやすくして再剥離性をさらに高めるために、テープ再剥離時の持ち手としてテープの末端を糊面側に折り返した状態で保持できること(自己粘着面粘着性)が要求される。 Adhesive tapes are used for masking, reinforcing, protecting, and identifying industrial products such as information equipment, office equipment, home appliances, and interiors during manufacturing and assembly, as well as for preventing damage during transportation after manufacturing and as a packing aid. is directly attached and is torn off after the purpose is achieved. Therefore, such an adhesive tape for temporary fixing has excellent fixing power (adhesive strength, high temperature retention) to the adherend and does not stain the adherend when peeled (also called re-peeling). A contradictory performance is required with less (removability).
In addition, in order to make it easier to remove the tape and further improve removability, it is required that the end of the tape can be held in a state where it is folded back to the adhesive side as a handle when removing the tape (self-adhesive surface adhesiveness). .
本実施形態係る粘着組成物は、天然ゴムと架橋剤と粘着付与剤と架橋調整剤を含む粘着組成物であり、該粘着組成物の硬化後の損失正接の極小温度が78.7℃以上で極小値が0.20以下であり、かつ該損失正接の極大温度が25.0℃以下で極大値が1.15以下であることを特徴とする。 An adhesive composition according to one embodiment of the present invention will be described.
The pressure-sensitive adhesive composition according to the present embodiment is a pressure-sensitive adhesive composition containing natural rubber, a cross-linking agent, a tackifier, and a cross-linking modifier. The minimum value is 0.20 or less, and the maximum temperature of the loss tangent is 25.0° C. or less and the maximum value is 1.15 or less.
損失正接(損失弾性率(G”)/貯蔵弾性率(G’)=損失正接(tanδ))は貯蔵弾性率(弾性)に対する損失弾性率(粘性)の寄与の度合いを意味する。
本粘着組成物の硬化後の損失正接の極小温度が78.7℃以上であることは、損失弾性率(粘性)の寄与の度合いの極小値が小さく、本粘着組成物からなる硬化物が所定の硬さを有する温度が高い、すなわち、本粘着組成物からなる粘着剤層が比較的高い温度でも適度な硬さを保つことを示す。損失正接の極小温度が78.7℃未満では高温での保持力が劣る。
また、本粘着組成物の硬化後の損失正接の極小値が0.20以下であることは、本粘着組成物の硬化物(粘着剤層)が過度に柔らかくなりにくく、流動しにくいことを示す。 <Loss tangent>
Loss tangent (loss modulus (G″)/storage modulus (G′)=loss tangent (tan δ)) means the degree of contribution of loss modulus (viscosity) to storage modulus (elasticity).
When the minimum temperature of the loss tangent after curing of the adhesive composition is 78.7 ° C. or higher, the minimum value of the degree of contribution to the loss elastic modulus (viscosity) is small, and the cured product made of the adhesive composition is a predetermined In other words, the pressure-sensitive adhesive layer made of the present pressure-sensitive adhesive composition maintains appropriate hardness even at relatively high temperatures. If the minimum loss tangent temperature is less than 78.7° C., the holding power at high temperatures is poor.
In addition, the fact that the minimum value of the loss tangent after curing of the adhesive composition is 0.20 or less indicates that the cured product (adhesive layer) of the adhesive composition is unlikely to become excessively soft and difficult to flow. .
また、損失正接の極大値は剥離抵抗を示し、本粘着組成物の硬化物の損失正接の極大値が1.15以下であることは、粘着剤層としたときの剥離抵抗が小さく本粘着組成物を用いた粘着テープが剥がしやすいことを示す。 Furthermore, the maximum temperature of the loss tangent indicates the glass transition temperature, and the fact that the maximum temperature of the loss tangent of the present adhesive composition is 25.0 ° C. or less means that the cured product of the present adhesive composition has a low glass transition temperature and a low temperature. However, it shows that moderate flexibility is maintained.
In addition, the maximum value of the loss tangent indicates the peel resistance, and the maximum value of the loss tangent of the cured product of the adhesive composition is 1.15 or less, so that the peel resistance when used as an adhesive layer is small. It shows that the adhesive tape using the object is easy to peel off.
<天然ゴム>
天然ゴムとは、ゴムの樹の樹液である天然ゴムラテックスを凝固・乾燥して得られたものであり、cis-1,4-ポリイソプレンを主成分とする物質である。
天然ゴム分子の構造としては、cis-1,4-イソプレン単位の一方の末端がタンパク質末端で構成され、他方の末端にはリン酸脂質が結合し、このリン酸脂質末端に更に長鎖脂肪酸が結合した構造であるといわれている。
また、天然ゴムにはタンパク質や脂質など3~4質量%の非ゴム成分が含まれる。
このため、天然ゴムは、後述する架橋剤により容易に架橋・硬化させることが可能である。なお、本発明に係る粘着組成物は架橋して硬化するため、架橋体を硬化物ともいう。 Each component will be explained.
<Natural rubber>
Natural rubber is obtained by coagulating and drying natural rubber latex, which is the sap of rubber trees, and is a substance composed mainly of cis-1,4-polyisoprene.
As for the structure of a natural rubber molecule, one end of a cis-1,4-isoprene unit is composed of a protein end, a phosphate lipid is bound to the other end, and a long-chain fatty acid is further attached to the phosphate lipid end. It is said to be a bonded structure.
In addition, natural rubber contains 3 to 4% by mass of non-rubber components such as proteins and lipids.
Therefore, natural rubber can be easily crosslinked and cured with a crosslinking agent, which will be described later. In addition, since the adhesive composition according to the present invention is crosslinked and cured, the crosslinked product is also referred to as a cured product.
このため、あらかじめ加圧ニーダーやバンバリーミキサー、オープンロールなどによって機械的に素練りを行い、天然ゴムの分子量を適度に低下させて可塑度を調整し、配合に用いる必要がある。 In general, unmasticated natural rubber has a very high molecular weight. If the molecular weight of the natural rubber is too high, the plasticity of the natural rubber is high and the pressure-sensitive adhesive composition lacks flexibility, making it difficult to obtain appropriate pressure-sensitive adhesive properties. may not be possible.
Therefore, it is necessary to mechanically masticate natural rubber in advance using a pressure kneader, a Banbury mixer, an open roll, or the like, to moderately reduce the molecular weight of the natural rubber and adjust the plasticity, and use it for compounding.
天然ゴムを架橋させる方式には、加硫剤を用いて加硫処理をする方式と、官能基間の反応による架橋方式が知られている。
加硫方式では、天然ゴムの分子主鎖に含まれる不飽和結合に、硫黄系、チウラム系、キノイド系などの加硫剤が作用して、ポリマー同士を直接架橋するという反応機構をとるため、凝集力が大きく密で強い架橋が実現可能である。 <Crosslinking agent>
Known methods for cross-linking natural rubber include a vulcanization treatment method using a vulcanizing agent and a cross-linking method by reaction between functional groups.
In the vulcanization method, a sulfur-based, thiuram-based, or quinoid-based vulcanizing agent acts on the unsaturated bonds contained in the molecular main chain of natural rubber, and the reaction mechanism is such that the polymers are directly crosslinked. Dense and strong cross-linking with a large cohesive force can be realized.
本実施形態の粘着組成物では、粘着付与剤として天然ゴムと相溶性の良い粘着付与樹脂が使用でき、特には軟化点125℃以上の石油系樹脂、テルペン樹脂、ロジン樹脂およびその他樹脂からなる群より選択された少なくとも1種の樹脂が使用できる。特に軟化点125℃以上の石油系樹脂(飽和脂肪族炭化水素樹脂)であることが好ましい。このような粘着付与剤は、天然ゴム100質量部に対して50~100質量部、好ましくは60~90質量部添加して使用できる。
軟化点が125℃より低い粘着付与樹脂を粘着付与剤として使用した場合、物品の仮固定用途に要求される優れた粘着力・高温保持性・再剥離性を有する粘着組成物ならびに粘着テープを得ることができない場合がある。
また、粘着付与剤の添加量が多すぎたり少なすぎたりした場合にも、上記物性を有する粘着組成物ならびに粘着テープを得ることができない場合がある。 <Tackifier>
In the adhesive composition of the present embodiment, a tackifying resin having good compatibility with natural rubber can be used as a tackifier, particularly a group consisting of petroleum-based resins, terpene resins, rosin resins, and other resins having a softening point of 125 ° C. or higher. At least one more selected resin can be used. In particular, petroleum-based resins (saturated aliphatic hydrocarbon resins) having a softening point of 125° C. or higher are preferred. Such a tackifier can be used by adding 50 to 100 parts by weight, preferably 60 to 90 parts by weight, to 100 parts by weight of natural rubber.
To obtain a pressure-sensitive adhesive composition and a pressure-sensitive adhesive tape having excellent adhesive strength, high-temperature retention and removability required for temporary fixing of articles when a tackifying resin having a softening point lower than 125°C is used as a tackifier. may not be possible.
Moreover, when the amount of the tackifier added is too large or too small, it may not be possible to obtain the adhesive composition and the adhesive tape having the above physical properties.
本実施形態の粘着組成物では、架橋調整剤を使用することで組成物の架橋度合(ゲル化度)を調整している。これは粘着組成物の優れた粘着力と高い凝集力・高温保持力を両立できる範囲の、適度に柔軟で密な架橋反応を実現する目的で使用するものである。特に本発明では架橋剤としてのイソシアネート化合物と天然ゴムの水酸基等との反応をある程度阻害する化合物を架橋調整剤として使用する。 <Crosslinking modifier>
In the adhesive composition of the present embodiment, the degree of crosslinking (degree of gelation) of the composition is adjusted by using a crosslinking regulator. This is used for the purpose of realizing a moderately flexible and dense cross-linking reaction within a range in which both excellent adhesive strength of the adhesive composition and high cohesive strength and high-temperature holding power can be achieved. In particular, in the present invention, a compound that inhibits to some extent the reaction between the isocyanate compound as the cross-linking agent and the hydroxyl groups of natural rubber is used as the cross-linking modifier.
ヒンダードフェノール系化合物としては、具体的には、ペンタエリトリトールテトラキス[3-(3,5-ジ-tert-ブチル-4-ヒドロキシフェニル)プロピオナート]、2,2’-チオジエチルビス[3-(3,5-ジ-tert-ブチル-4-ヒドロキシフェニル)プロピオナート]、3-(4’-ヒドロキシ-3’,5’-ジ-tert-ブチルフェニル)プロピオン酸-n-オクタデシル、N,N’-(ヘキサン-1,6-ジイル)ビス[3-(3,5-ジ-tert-ブチル-4-ヒドロキシフェニル)プロパンアミド]、オクチル-3,5-ジ-tert-ブチル-4-ヒドロキシ-ヒドロ肉桂酸、2,4,6-トリス(3’,5’-ジ-tert-ブチル-4’-ヒドロキシベンジル)メシチレン、2,4-ビス(オクチルチオメチル)-6-メチルフェノール、ビス[3-(3-tert-ブチル-4-ヒドロキシ-5-メチルフェニル)プロピオン酸][エチレンビス(オキシエチレン)]、1,6-ヘキサンジオールビス[3-(3,5-ジ-tert-ブチル-4-ヒドロキシフェニル)プロピオナート]、1,3,5-トリス(3,5-ジ-tert-ブチル-4-ヒドロキシベンジル)-1,3,5-トリアジン-2,4,6(1H,3H,5H)-トリオン、4-[[4,6-ビス(オクチルチオ)-1,3,5-トリアジン-2-イル]アミノ]-2,6-ジ-tert-ブチルフェノール等が挙げられる。 In the adhesive composition of the present embodiment, at least one selected from the group consisting of hindered phenol-based compounds, phosphorus-based compounds, metal-based compounds, benzotriazole-based compounds, triazine-based compounds, hindered amine-based compounds, etc., as a cross-linking modifier. Additional compounds can be used.
Specific examples of the hindered phenol compounds include pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,2'-thiodiethylbis[3-( 3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 3-(4′-hydroxy-3′,5′-di-tert-butylphenyl)propionate-n-octadecyl, N,N′ -(hexane-1,6-diyl)bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanamide], octyl-3,5-di-tert-butyl-4-hydroxy- hydrocincinic acid, 2,4,6-tris(3′,5′-di-tert-butyl-4′-hydroxybenzyl)mesitylene, 2,4-bis(octylthiomethyl)-6-methylphenol, bis[ 3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionic acid][ethylenebis(oxyethylene)], 1,6-hexanediolbis[3-(3,5-di-tert-butyl -4-hydroxyphenyl)propionate], 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6(1H,3H ,5H)-trione, 4-[[4,6-bis(octylthio)-1,3,5-triazin-2-yl]amino]-2,6-di-tert-butylphenol and the like.
さらに上記粘着組成物には、必要に応じて、上記物性を損なわない範囲内で、無機充填材、樹脂等の有機充填材、軟化剤、可塑剤、界面活性剤、カップリング剤、着色剤、保存剤、熱安定剤、光安定剤などの1種もしくは2種以上が更に添加されていてもよい。
本明細書において、「粘着組成物」とは、架橋前の各成分の混合物と、架橋後の組成物の両方を意味し、以下の粘着テープにおける「粘着剤層」はこの粘着組成物からなり、その場合、「粘着組成物」は架橋後の組成物を意味する。また、粘着剤層を形成するために溶剤に溶解・分散させた状態、さらに溶剤を除去した乾燥物も「粘着組成物」ということがある。 <Other additives>
Further, the adhesive composition may contain inorganic fillers, organic fillers such as resins, softeners, plasticizers, surfactants, coupling agents, colorants, One or more of preservatives, heat stabilizers, light stabilizers, etc. may be further added.
As used herein, the term "adhesive composition" means both a mixture of components before cross-linking and a composition after cross-linking. , in which case "adhesive composition" means the composition after cross-linking. In addition, the state of dissolving or dispersing in a solvent to form an adhesive layer, and the dried product obtained by removing the solvent may also be referred to as the "adhesive composition".
また、本発明の粘着テープは、シート状の基材の少なくとも一方の面に、上記粘着組成物からなる粘着剤層を形成した粘着テープである。例えば、図1に示すように、基材11の片面に上記粘着組成物からなる粘着剤層12を設けた片面粘着テープや、図2に示すように基材21の両面に設けられた粘着剤層22と粘着剤層23の少なくとも一方、あるいは両方に上記粘着組成物を使用した両面テープである。 [Adhesive tape]
Further, the pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive tape in which a pressure-sensitive adhesive layer comprising the pressure-sensitive adhesive composition is formed on at least one surface of a sheet-like base material. For example, as shown in FIG. 1, a single-sided adhesive tape having an
前記のシート状の基材の種類としては特に限定されず、通常使用される公知のフィルムやフォーム、織布、編布、紙などの不織材など、シート状であればいずれでも良い。
中でも、樹脂製のフィルム基材が好ましく、樹脂材料としてポリエチレン(PE)、ポリプロピレン(PP)、延伸ポリプロピレン(OPP)、ポリエステル、ポリエチレンテレフタレート(PET)、ポリ塩化ビニル(PVC)、ポリエチレンナフタレート(PEN)、ポリフェニレンスルフィド、エチレン-ビニルアセテート共重合体(EVA)等や、これらのブレンド物などが挙げられる。このような合成樹脂からなるフィルムである場合、機械的強度に優れており、被着体汚染が生じず、物品の製造・組立段階や輸送段階で使用する仮固定用の粘着テープとして好ましい。 <Sheet-like base material>
The type of the sheet-shaped substrate is not particularly limited, and any sheet-shaped substrate such as commonly used known films, foams, woven fabrics, knitted fabrics, and non-woven materials such as paper may be used.
Among them, resin-made film substrates are preferable, and resin materials such as polyethylene (PE), polypropylene (PP), oriented polypropylene (OPP), polyester, polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyethylene naphthalate (PEN ), polyphenylene sulfide, ethylene-vinyl acetate copolymer (EVA), and blends thereof. A film made of such a synthetic resin is excellent in mechanical strength and does not cause contamination of adherends, and is preferable as an adhesive tape for temporary fixing used in the manufacturing/assembling stage and transportation stage of articles.
下塗り層に用いる下塗り剤は特に限定されず、その効果を発揮するものであればいずれでもよい。特に粘着剤層に含まれる化合物の官能基と反応し得る官能基を有するものであれば、粘着剤層を形成する際の架橋の際に、下塗り層へも反応が進み、基材との接着力を高めることができる。乾燥後の下塗り層の付着量又は坪量は、通常0.2~2g/m2、好ましくは0.4~1.2g/m2である。 <Undercoat>
There are no particular limitations on the undercoat agent used in the undercoat layer, and any agent may be used as long as it exhibits its effect. In particular, if it has a functional group that can react with the functional group of the compound contained in the pressure-sensitive adhesive layer, the undercoat layer will also react during the cross-linking to form the pressure-sensitive adhesive layer, resulting in adhesion to the substrate. can increase power. The coating weight or basis weight of the undercoat layer after drying is generally 0.2 to 2 g/m 2 , preferably 0.4 to 1.2 g/m 2 .
図1に示すような、基材11の一方の面11Aに粘着剤層12を形成し、ロール状に巻回す際には、基材のもう一方の面11Bに粘着剤層が接することとなる。ロールからの引き出し性を良化するために離型層を面11Bに形成しておくことが好ましい。この離型層に用いられる離型処理剤は特に限定されず、その効果を発揮するものであればいずれでもよい。例えば、シリコーン樹脂、長鎖アルキルビニルモノマー重合物、フッ化アルキルビニルモノマー重合物、ポリビニルアルコールカルバメートなどが知られている。このうちシリコーン樹脂は基材表面の剥離性能を向上させる特性に優れている。乾燥後の離型層の付着量又は坪量は、通常0.2~2g/m2、好ましくは0.4~1.2g/m2である。 <Release agent>
When the
図2に示すような両面粘着テープの場合、粘着剤層の外表面には離型シートを剥離可能な態様で積層しておくことが、取扱性の点で好ましい。また、ロール状に巻回する場合は、粘着剤層22と粘着剤層23との間に離型シートが挟まれるようにして巻回することができる。離型シートは高い強度をあまり必要としないことから、シート状物の片面または両面に上記のような離型処理を施したものを用いることができる。 <Release sheet>
In the case of the double-sided pressure-sensitive adhesive tape as shown in FIG. 2, it is preferable in terms of handleability to laminate a release sheet on the outer surface of the pressure-sensitive adhesive layer in a peelable manner. Moreover, in the case of winding in a roll shape, the
また、以下の記載において「部」は「質量部」を意味する。 EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to the following examples.
Moreover, in the following description, "parts" means "parts by mass".
基材:PETフィルム(厚み38μm)
天然ゴム:ペールクレープ
(表記載のムーニー粘度の異なるグレードを使用)
架橋剤:
A 商品名「ミリオネート MR-200」、
東ソー製、ポリメリックMDI
B 商品名「コロネート L-45E」、
東ソー製、変性ポリイソシアネート
C 商品名「E-5C」、綜研化学製、エポキシ系架橋剤
D 商品名「Vulkacit Thiuram/C」、ランクセス株式会社、
チウラム系加硫剤(テトラメチルチウラム ジスルフィド)
粘着付与剤:
A 商品名「ペンセル D-135」、荒川化学工業製、
重合ロジンエステル、軟化点130~140℃
B 商品名「アルコンP-140」、荒川化学工業製、
石油系樹脂、軟化点 140℃±5℃
C 商品名「アルコンP-100」、荒川化学工業製、
石油系樹脂、軟化点 100℃±5℃
架橋調整剤:商品名「イルガノックス1010」、BASFジャパン製、
(ヒンダードフェノール系化合物) Materials used in Examples and Comparative Examples are as follows. The physical property values of each material are manufacturer's catalog values.
Base material: PET film (thickness 38 μm)
Natural rubber: Pale crepe (grades with different Mooney viscosities listed in the table are used)
Crosslinker:
A. Trade name “Millionate MR-200”,
Polymeric MDI made by Tosoh
B trade name "Coronate L-45E",
Modified polyisocyanate C, trade name “E-5C” manufactured by Tosoh, Epoxy cross-linking agent D, trade name “Vulkacit Thiuram/C” manufactured by Soken Chemical, LANXESS Corporation,
Thiuram vulcanizing agent (tetramethylthiuram disulfide)
Tackifier:
A Trade name “Pencel D-135”, manufactured by Arakawa Chemical Industries, Ltd.
Polymerized rosin ester, softening point 130-140°C
B Product name “Arcon P-140”, manufactured by Arakawa Chemical Industries, Ltd.
Petroleum resin, softening point 140°C ± 5°C
C Product name "Arcon P-100", manufactured by Arakawa Chemical Industries, Ltd.
Petroleum resin, softening point 100°C ± 5°C
Crosslinking modifier: trade name "Irganox 1010", manufactured by BASF Japan,
(Hindered phenol compound)
表1(表1-1及び表1-2)に示す配合比にて粘着組成物を調製し、トルエンに溶解混合して塗工液を調製した。基材の一面に下塗り剤(ポリメタクリル酸メチルグラフト化天然ゴム(マレーシアゴム研究所製造、商品名「MG30」)及び環化ゴム(ユーシービージャパン社製 商品名「ALPEX CK-450」)を質量比3:1で混合した固形分5質量%トルエン溶液)を塗布し、坪量0.8±0.4g/m2の下塗り層を形成した後、調製した塗工液を乾燥後の粘着剤層の厚みが32μmとなるように塗布し、110℃で乾燥及び架橋することで、図1に示すような片面粘着剤層を有する粘着テープを製造した。 (Examples 1 to 8, Reference Example 1, Comparative Examples 1 to 12)
Adhesive compositions were prepared at the compounding ratios shown in Table 1 (Tables 1-1 and 1-2), and dissolved and mixed in toluene to prepare coating solutions. Undercoat agent (polymethyl methacrylate grafted natural rubber (manufactured by Malaysian Rubber Research Institute, trade name “MG30”) and cyclized rubber (manufactured by UCB Japan, trade name “ALPEX CK-450”) is applied to one surface of the base material. 5 mass% solid content toluene solution mixed at a ratio of 3: 1) to form an undercoat layer with a basis weight of 0.8 ± 0.4 g / m 2 , and then the prepared coating solution is dried. A pressure-sensitive adhesive tape having a single-sided pressure-sensitive adhesive layer as shown in FIG. 1 was produced by applying the composition to a layer thickness of 32 μm, drying at 110° C. and cross-linking.
(損失正接)
各粘着組成物を用いて、それぞれ測定用の粘着剤層(厚み:2mm)を作製した。
そして、粘着剤層を、直径10mmに打ち抜き、それをパラレルプレートで挟み込む形で固定したものを測定試料とした。
この測定試料について、動的粘弾性測定装置を用い、下記条件で動的粘弾性測定を行い、損失弾性率(G”)と貯蔵弾性率(G’)の温度依存グラフを作成し、損失弾性率(G”)/貯蔵弾性率(G’)=損失正接(tanδ)から、極小温度、極小値、極大温度、極大値を求めた。また、評価として、極小側(極小温度が78.7℃以上及び極小値が0.20以下)、極大側(極大温度が25℃以下及び極大値が1.15以下)が規定の範囲を満たす場合を「Y」、満たさない場合を「N」とした。 The obtained pressure-sensitive adhesive tape was evaluated as follows.
(loss tangent)
Using each adhesive composition, an adhesive layer (thickness: 2 mm) for measurement was produced.
Then, the pressure-sensitive adhesive layer was punched into a piece having a diameter of 10 mm, and the piece was fixed by sandwiching it between parallel plates to obtain a measurement sample.
For this measurement sample, using a dynamic viscoelasticity measuring device, dynamic viscoelasticity measurement was performed under the following conditions to create a temperature dependence graph of loss elastic modulus (G″) and storage elastic modulus (G′). A minimum temperature, a minimum value, a maximum temperature, and a maximum value were obtained from Modulus (G″)/storage modulus (G′)=loss tangent (tan δ). In addition, as an evaluation, the minimum side (minimum temperature of 78.7 ° C. or higher and the minimum value of 0.20 or less) and the maximum side (maximum temperature of 25 ° C. or less and the maximum value of 1.15 or less) satisfy the specified range. "Y" for the case, and "N" for the case not satisfied.
周波数:10.0Hz
温度:-60~200℃
昇温温度:10℃/分
ひずみ:0.1% Apparatus: manufactured by TA Instruments, trade name "ARESRDA-III"
Frequency: 10.0Hz
Temperature: -60 to 200°C
Temperature rise: 10°C/min Strain: 0.1%
粘着力は、JIS Z 0237:2000に準拠した試験方法を用いて測定した。
被着体として、PS(ポリスチレン)、PP(ポリプロピレン)、PC(ポリカーボネート)、粗面PC(片面をマット加工したもの、タキロンシーアイ社製、商品名「PCSP K6600」)、ガラス、SUS板(#280耐水研磨紙にて表面が均一になるまで研磨したSUS304板)、Al板、アクリル塗装板(日本製鉄社製のSPCC-SBアクリル塗装板(塗料:大日本塗料社製「ニューアクロッツェ クロ ツヤあり」))を用いた。 (Adhesive force)
Adhesive strength was measured using a test method based on JIS Z 0237:2000.
As the adherend, PS (polystyrene), PP (polypropylene), PC (polycarbonate), rough PC (matted on one side, manufactured by Takiron C.I., trade name "PCSP K6600"), glass, SUS plate (# SUS304 plate polished until the surface is uniform with 280 water-resistant abrasive paper), Al plate, acrylic-coated plate (SPCC-SB acrylic-coated plate manufactured by Nippon Steel Corporation (Paint: "New Acrotze Black Glossy" manufactured by Dainippon Toryo Co., Ltd.) Yes”)) was used.
測定温度120℃において、SUS板に貼り付けた長さ25mm幅10mmの試験片の長さ方向の端部に500gの荷重のおもりを垂直方向に付加し、おもりが落下するまでの時間を評価した。落下時間が120分以上を「A」、60分以上120分未満を「B」とし、60分未満を「C」と判定した。 (High temperature holding power)
At a measurement temperature of 120° C., a weight of 500 g was applied vertically to the longitudinal end of a test piece with a length of 25 mm and a width of 10 mm attached to a SUS plate, and the time until the weight fell was evaluated. . A drop time of 120 minutes or more was rated as "A", 60 minutes or more and less than 120 minutes as "B", and less than 60 minutes as "C".
粘着力の測定に使用した各被着体に粘着テープを貼付け、65℃85%RH雰囲気下に7日以上放置した後、5℃雰囲気下に2時間以上放置して冷却し、5℃雰囲気下にて、粘着テープを手で被着体から剥ぎ取り被着体における糊残りや汚染現象の有無を目視で調べた。
糊残りやテープ痕跡・汚染が全く見られない場合を「A」、糊残りやテープ痕跡・汚染がほとんど見られない場合を「B」、糊残りやテープ痕跡・汚染が明らかに残っている場合を「C」と判定した。 (Adherend staining property)
Attach an adhesive tape to each adherend used to measure adhesive strength, leave it in an atmosphere of 65 ° C. and 85% RH for 7 days or more, then leave it in an atmosphere of 5 ° C. for 2 hours or more to cool, and cool it in an atmosphere of 5 ° C. , the adhesive tape was manually peeled off from the adherend, and the presence or absence of adhesive residue or contamination on the adherend was visually examined.
"A" indicates no adhesive residue, tape traces, or contamination; "B" indicates almost no adhesive residue, tape traces, or contamination; was determined as "C".
被着体に粘着テープを貼付け、端部を粘着面側に5mm折り曲げて65℃85%RH雰囲気下に1日以上放置した後、折り曲げた端部の剥がれの長さを目視で測定した。 (Self-adhesive surface adhesiveness)
An adhesive tape was affixed to the adherend, the end was bent 5 mm toward the adhesive surface, left in an atmosphere of 65°C and 85% RH for one day or more, and then the peeled length of the bent end was visually measured.
全ての評価において、ランクAを含み、ランクBが2つ以下を「A」、ランクAを含み、ランクBが3つ又は4つを「B」、ランクAを含み、ランクBが5つを「C」、ランクDを含む場合を「D」と評価した。 (Comprehensive evaluation)
In all evaluations, including rank A and 2 or less rank B is "A", including rank A and 3 or 4 rank B is "B", including rank A and 5 rank B "C" was evaluated, and "D" was evaluated when rank D was included.
表1-1及び1-2に示すように、実施例では本発明で規定の損失正接を満足する組成物が得られたが、比較例では極小側及び極大側のいずれか一方又は両方を満足する組成物ではなかった。
また、表2-1に示すように、実施例1~9の粘着テープは、粘着力、高温保持力、被着体汚染性、自己粘着面粘着性の全てにおいて優れていた。 <Evaluation results>
As shown in Tables 1-1 and 1-2, the compositions satisfying the specified loss tangent of the present invention were obtained in the examples, while the comparative examples satisfied either or both of the minimum side and the maximum side. It was not a composition that
Further, as shown in Table 2-1, the adhesive tapes of Examples 1 to 9 were excellent in all of adhesive strength, high temperature holding power, adherend contamination resistance, and self-adhesive surface adhesiveness.
12、22、23 粘着剤層 11, 21
Claims (10)
- 天然ゴムと架橋剤と粘着付与剤と架橋調整剤を含む粘着組成物であり、該粘着組成物の硬化後の損失正接の極小温度が78.7℃以上で極小値が0.20以下であり、かつ該損失正接の極大温度が25.0℃以下で極大値が1.15以下であることを特徴とする粘着組成物。 A pressure-sensitive adhesive composition comprising a natural rubber, a cross-linking agent, a tackifier and a cross-linking modifier, wherein the minimum temperature of the loss tangent after curing of the pressure-sensitive adhesive composition is 78.7° C. or more and the minimum value is 0.20 or less. and the maximum temperature of the loss tangent is 25.0° C. or less and the maximum value is 1.15 or less.
- 前記天然ゴムは、ムーニー粘度ML1+4(100℃)が20~85のものである請求項1に記載の粘着組成物。 2. The adhesive composition according to claim 1, wherein the natural rubber has a Mooney viscosity ML 1+4 (100° C.) of 20-85.
- 前記天然ゴムは、ムーニー粘度ML1+4(100℃)が20~35のものである請求項2に記載の粘着組成物。 3. The adhesive composition according to claim 2, wherein the natural rubber has a Mooney viscosity ML 1+4 (100° C.) of 20-35.
- 前記架橋剤が、非硫黄系の架橋剤である請求項1~3のいずれか1項に記載の粘着組成物。 The adhesive composition according to any one of claims 1 to 3, wherein the cross-linking agent is a non-sulfur-based cross-linking agent.
- 前記架橋剤が、イソシアネート系化合物を含む請求項4に記載の粘着組成物。 The adhesive composition according to claim 4, wherein the cross-linking agent contains an isocyanate compound.
- 前記イソシアネート系化合物は、ジフェニルメタンジイソシアネート構造を有する請求項5に記載の粘着組成物。 The adhesive composition according to claim 5, wherein the isocyanate compound has a diphenylmethane diisocyanate structure.
- 前記粘着付与剤は、125℃以上の軟化点を有する石油系樹脂からなる請求項1~6のいずれか1項に記載の粘着組成物。 The adhesive composition according to any one of claims 1 to 6, wherein the tackifier comprises a petroleum-based resin having a softening point of 125°C or higher.
- 前記架橋調整剤が、ヒンダードフェノール系化合物、リン系化合物、金属系化合物、ベンゾトリアゾール系化合物、トリアジン系化合物、ヒンダードアミン系化合物から選択される少なくとも1種の化合物である請求項1~7のいずれか1項に記載の粘着組成物。 8. Any one of claims 1 to 7, wherein the cross-linking modifier is at least one compound selected from hindered phenol compounds, phosphorus compounds, metal compounds, benzotriazole compounds, triazine compounds, and hindered amine compounds. 1. The adhesive composition according to claim 1.
- 前記天然ゴム100質量部に対して、前記架橋剤を1~15質量部、前記粘着付与剤を50~100質量部、前記架橋調整剤を1~5質量部含む請求項1~8のいずれか1項に記載の粘着組成物。 9. Any one of claims 1 to 8, comprising 1 to 15 parts by mass of the cross-linking agent, 50 to 100 parts by mass of the tackifier, and 1 to 5 parts by mass of the cross-linking modifier with respect to 100 parts by mass of the natural rubber. 1. The adhesive composition according to item 1.
- シート状の基材の少なくとも一方の面に、請求項1~9のいずれか1項に記載の粘着組成物からなる粘着剤層を有する粘着テープ。 An adhesive tape having an adhesive layer made of the adhesive composition according to any one of claims 1 to 9 on at least one surface of a sheet-like base material.
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PCT/JP2021/014048 WO2022208814A1 (en) | 2021-03-31 | 2021-03-31 | Pressure-sensitive adhesive composition and pressure-sensitive adhesive tape |
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- 2021-03-31 WO PCT/JP2021/014048 patent/WO2022208814A1/en active Application Filing
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CN116348565A (en) | 2023-06-27 |
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JPWO2022208814A1 (en) | 2022-10-06 |
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JP7072735B1 (en) | 2022-05-20 |
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