JP2004352905A - Aqueous polyurethane adhesive for lamination - Google Patents
Aqueous polyurethane adhesive for lamination Download PDFInfo
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- JP2004352905A JP2004352905A JP2003153774A JP2003153774A JP2004352905A JP 2004352905 A JP2004352905 A JP 2004352905A JP 2003153774 A JP2003153774 A JP 2003153774A JP 2003153774 A JP2003153774 A JP 2003153774A JP 2004352905 A JP2004352905 A JP 2004352905A
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- JP
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- Prior art keywords
- laminate adhesive
- adhesive according
- component
- aqueous polyurethane
- acid
- Prior art date
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- 239000000853 adhesive Substances 0.000 title claims abstract description 44
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 44
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 24
- 239000004814 polyurethane Substances 0.000 title claims abstract description 24
- 238000003475 lamination Methods 0.000 title abstract description 5
- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 19
- 150000001875 compounds Chemical class 0.000 claims abstract description 15
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 12
- 125000000717 hydrazino group Chemical group [H]N([*])N([H])[H] 0.000 claims abstract description 7
- 239000012736 aqueous medium Substances 0.000 claims abstract description 3
- 229920005906 polyester polyol Polymers 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 16
- -1 diisocyanate compound Chemical class 0.000 claims description 16
- 239000002253 acid Substances 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 10
- SXFJDZNJHVPHPH-UHFFFAOYSA-N 3-methylpentane-1,5-diol Chemical compound OCCC(C)CCO SXFJDZNJHVPHPH-UHFFFAOYSA-N 0.000 claims description 9
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 230000003472 neutralizing effect Effects 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 125000003118 aryl group Chemical group 0.000 claims description 3
- XEVRDFDBXJMZFG-UHFFFAOYSA-N carbonyl dihydrazine Chemical compound NNC(=O)NN XEVRDFDBXJMZFG-UHFFFAOYSA-N 0.000 claims description 3
- MMCOUVMKNAHQOY-UHFFFAOYSA-N carbonoperoxoic acid Chemical compound OOC(O)=O MMCOUVMKNAHQOY-UHFFFAOYSA-N 0.000 claims description 2
- PUPZLCDOIYMWBV-UHFFFAOYSA-N (+/-)-1,3-Butanediol Chemical compound CC(O)CCO PUPZLCDOIYMWBV-UHFFFAOYSA-N 0.000 claims 4
- 125000002723 alicyclic group Chemical group 0.000 claims 2
- 125000001931 aliphatic group Chemical group 0.000 claims 2
- 150000005846 sugar alcohols Polymers 0.000 claims 1
- 239000011888 foil Substances 0.000 abstract description 8
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 239000002985 plastic film Substances 0.000 abstract description 6
- 229920006255 plastic film Polymers 0.000 abstract description 6
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 45
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 13
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 12
- 238000003786 synthesis reaction Methods 0.000 description 12
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 11
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 10
- PTBDIHRZYDMNKB-UHFFFAOYSA-N 2,2-Bis(hydroxymethyl)propionic acid Chemical compound OCC(C)(CO)C(O)=O PTBDIHRZYDMNKB-UHFFFAOYSA-N 0.000 description 8
- 230000001588 bifunctional effect Effects 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 6
- 235000013305 food Nutrition 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 5
- 235000011037 adipic acid Nutrition 0.000 description 5
- 239000001361 adipic acid Substances 0.000 description 5
- 239000000839 emulsion Substances 0.000 description 5
- 238000009775 high-speed stirring Methods 0.000 description 5
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 5
- 229920005862 polyol Polymers 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 239000005058 Isophorone diisocyanate Substances 0.000 description 4
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 description 4
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 description 4
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 4
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- IBVAQQYNSHJXBV-UHFFFAOYSA-N adipic acid dihydrazide Chemical compound NNC(=O)CCCCC(=O)NN IBVAQQYNSHJXBV-UHFFFAOYSA-N 0.000 description 3
- 150000001991 dicarboxylic acids Chemical class 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 125000003700 epoxy group Chemical group 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 3
- 239000005056 polyisocyanate Substances 0.000 description 3
- 229920001228 polyisocyanate Polymers 0.000 description 3
- 150000003077 polyols Chemical class 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 3
- FKTHNVSLHLHISI-UHFFFAOYSA-N 1,2-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC=C1CN=C=O FKTHNVSLHLHISI-UHFFFAOYSA-N 0.000 description 2
- 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
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 125000005442 diisocyanate group Chemical group 0.000 description 2
- 238000004945 emulsification Methods 0.000 description 2
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 2
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 2
- 239000012939 laminating adhesive Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- 229920006284 nylon film Polymers 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- 150000003335 secondary amines Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- DNIAPMSPPWPWGF-VKHMYHEASA-N (+)-propylene glycol Chemical compound C[C@H](O)CO DNIAPMSPPWPWGF-VKHMYHEASA-N 0.000 description 1
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 description 1
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 description 1
- KATAXDCYPGGJNJ-UHFFFAOYSA-N 1,3-bis(oxiran-2-ylmethoxy)propan-2-ol Chemical compound C1OC1COCC(O)COCC1CO1 KATAXDCYPGGJNJ-UHFFFAOYSA-N 0.000 description 1
- YPFDHNVEDLHUCE-UHFFFAOYSA-N 1,3-propanediol Substances OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 description 1
- 229940043375 1,5-pentanediol Drugs 0.000 description 1
- JVYDLYGCSIHCMR-UHFFFAOYSA-N 2,2-bis(hydroxymethyl)butanoic acid Chemical compound CCC(CO)(CO)C(O)=O JVYDLYGCSIHCMR-UHFFFAOYSA-N 0.000 description 1
- UHAMPPWFPNXLIU-UHFFFAOYSA-N 2,2-bis(hydroxymethyl)pentanoic acid Chemical compound CCCC(CO)(CO)C(O)=O UHAMPPWFPNXLIU-UHFFFAOYSA-N 0.000 description 1
- YBDQLHBVNXARAU-UHFFFAOYSA-N 2-methyloxane Chemical compound CC1CCCCO1 YBDQLHBVNXARAU-UHFFFAOYSA-N 0.000 description 1
- ULMZOZMSDIOZAF-UHFFFAOYSA-N 3-hydroxy-2-(hydroxymethyl)propanoic acid Chemical compound OCC(CO)C(O)=O ULMZOZMSDIOZAF-UHFFFAOYSA-N 0.000 description 1
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- ALQSHHUCVQOPAS-UHFFFAOYSA-N Pentane-1,5-diol Chemical compound OCCCCCO ALQSHHUCVQOPAS-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- BMRWNKZVCUKKSR-UHFFFAOYSA-N butane-1,2-diol Chemical compound CCC(O)CO BMRWNKZVCUKKSR-UHFFFAOYSA-N 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- QSAWQNUELGIYBC-UHFFFAOYSA-N cyclohexane-1,2-dicarboxylic acid Chemical compound OC(=O)C1CCCCC1C(O)=O QSAWQNUELGIYBC-UHFFFAOYSA-N 0.000 description 1
- ZWLIYXJBOIDXLL-UHFFFAOYSA-N decanedihydrazide Chemical compound NNC(=O)CCCCCCCCC(=O)NN ZWLIYXJBOIDXLL-UHFFFAOYSA-N 0.000 description 1
- 150000001990 dicarboxylic acid derivatives Chemical class 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- WJRBRSLFGCUECM-UHFFFAOYSA-N hydantoin Chemical group O=C1CNC(=O)N1 WJRBRSLFGCUECM-UHFFFAOYSA-N 0.000 description 1
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 150000007529 inorganic bases Chemical group 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- DNIAPMSPPWPWGF-UHFFFAOYSA-N monopropylene glycol Natural products CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 1
- OLAPPGSPBNVTRF-UHFFFAOYSA-N naphthalene-1,4,5,8-tetracarboxylic acid Chemical compound C1=CC(C(O)=O)=C2C(C(=O)O)=CC=C(C(O)=O)C2=C1C(O)=O OLAPPGSPBNVTRF-UHFFFAOYSA-N 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000223 polyglycerol Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920000166 polytrimethylene carbonate Polymers 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 235000013772 propylene glycol Nutrition 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 235000013580 sausages Nutrition 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 239000004846 water-soluble epoxy resin Substances 0.000 description 1
Abstract
Description
【0001】
【技術分野】
本発明は、複数のプラスチックフィルムまたはプラスチックフィルムと金属箔を積層してなるラミネートを製造する場合に使用される接着剤、特に水系ポリウレタン樹脂を主成分とする接着剤に関する。
【0002】
【先行技術および課題】
包装材料として用いられるフィルムにはいくつかの異なる性能が求められる。これらの異なる性能のすべてを単一のフィルムに持たせるのは困難であるため、個々の異なる性能を持つ複数のプラスチックフィルム又はプラスチックフィルムと金属箔をラミネートすることによって複数の異なる性能を持たせることができる。例えばポリエチレンフィルムやポリプロピレンフィルムはヒートシールが可能であるが水や水蒸気に対する非透過性が劣っている。反対にナイロン(ポリアミド)フィルムや金属箔は低い水分透過性を有するがヒートシールは困難もしくは不可能である。ポリエチレンもしくはポリプレンフィルムとナイロンフィルムまたは金属箔とのラミネートは、ヒートシール可能であり、かつ低い水蒸気透過性を有する。
【0003】
このように異種材料のフィルム同士またはフィルムと箔は接着剤を用いてラミネートに接着される。ところが異種材料間の化学的親和性が低いため、特にポリオレフィン系樹脂は極性基を持たないため、高い接着強度を得るためにはラミネート前に例えばコロナ放電(プラズマ処理)によって表面に極性基を形成する等の前処理が必要である。このような前処理に代ってまたは前処理に加え、使用する接着剤の化学的組成にも接着強度を高める改良が望まれる。さらに接着剤、特に飲食品用途のラミネート用の接着剤には、環境上および衛生上の見地から有機溶剤を含まない系が望ましい。
【0004】
水系ポリウレタン樹脂を主成分とするラミネート接着剤はこれらの要望の多くを満たす候補の一つである。しかしながら水系ポリウレタン樹脂単独では例えばレトルト食品包装用のラミネートのような苛酷な条件に満足に耐えられる高い接着強度を得るのは困難である。
【0005】
水系ポリウレタン樹脂を主成分とするラミネート接着剤は、特許第3001358号およびそれに引用されている特許文献や、特開2002−285124号公報に見られる。これらは中和によって水溶性または水に自己乳化性とするためポリウレタン樹脂がペンダントカルボキシル基を持っており、前者はポリウレタン樹脂がその前駆体プレポリマーと反応したヒドラジノ化合物を含んでおり、後者は水性ポリウレタン樹脂と、水難溶性エポキシ樹脂と、該エポキシ樹脂の硬化剤となるヒダントイン骨格を有する酸ヒドラジドまたはイミダゾール化合物を含んでいる。しかしながら先行技術による接着剤は製造上複雑な操作を必要とし、貯蔵時相分離またはゲル化し易いなどのほか、例えば熱水中120℃×30分のような苛酷な条件における接着強度が満足でない。
【0006】
従って本発明の課題は、先行技術のラミネート接着剤を改良し、もっと簡単な操作によって製造することができ、かつ苛酷な条件において満足な接着強度を示す水系ポリウレタンラミネート接着剤を提供することにある。
【0007】
【課題の解決手段】
本発明は、水性媒体中に溶解または分散した、
a)鎖中にペンダントカルボキシル基を有するポリウレタン樹脂、
b)水溶性ポリエポキシ化合物、
c)複数のヒドラジノ基を有する化合物、および
d)中和剤、
を含んでいることを特徴とする水系ポリウレタンラミネート接着剤を提供する。
【0008】
本発明のラミネート接着剤は、先行技術に比較して簡単な操作で製造することができ、かつ苛酷な条件での加熱に耐えられる十分な接着強度が得られる利益がある。
【0009】
【好ましい実施態様】
a)鎖中にペンダントカルボキシル基を有するポリウレタン樹脂:
上記a)成分はウレタンプレポリマーから出発して製造することができる。良く知られているように、ウレタンプレポリマーはポリエーテルポリオールまたはポリエステルポリオールとポリイソシアネート化合物を反応することによって製造することができる。任意のポリエーテルポリオールまたはポリエステルポリオール、および任意のポリイソシアネート化合物を使用することができるが、本発明においては2官能ポリエステルポリオールと、2官能ポリイソシアネート化合物を使用するのが好ましい。
【0010】
2官能ポリエステルポリオールは、nモルのジカルボン酸を酸成分とし、n+1モルの2価アルコールをアルコール成分として重縮合反応によって製造することができる。使用し得るジカルボン酸は、無水フタル酸、イソフタル酸およびテレフタル酸のような芳香族ジカルボン酸、テトラーもしくはヘキサヒドロフタル酸のような水素化芳香族ジカルボン酸のような脂環族ジカルボン酸、アジピン酸、アゼライン酸およびセバシン酸のような脂肪族ジカルボン酸、およびこれらジカルボン酸の混合物を含み、かつこれらが好ましい。2価アルコールの例は、エチレングリコール、ジエチレングリコール、1,2−プロパンジオール、1,3−プロパンジオール、1,2−ブタンジオール、1,4−ブタンジオール、1,5−ペンタンジオール、1,6−ヘキサンジオールなどを含むが、3−メチル−1,5−ペンタンジオールおよびネオペンチルグリコールのように、側鎖を有しかつ両末端に1級アルコール性水酸基を有するグリコールが特に好ましい。3−メチル−1,5−ペンタンジオールが最も好ましい。
【0011】
2官能ポリエステルポリオールは好ましくは数平均分子量1,000〜5,000およびそれに相当する水酸基価を有し、特に好ましくは約2000〜3000の数平均分子量と、約35〜60mgKOH/gの水酸基価を有する。
【0012】
ポリウレタンの製造に使用されるジイソシアネート化合物は周知である。その例はトリレンジイソシアネート(TDI)、ジフェニルメタンジイソシアネート(MDI)、キシリレンジイソシアネート(XDI)のような芳香族ジイソシアネート、イソホロンジイソシアネート(IPDI)のような脂環族ジイソシアネート、およびヘキサメチレンジイソシアネート(HMDI)のような脂肪族ジイソシアネートを含む。
【0013】
nモルの2官能ポリエステルポリオールとn+1モルのジイソシアネート化合物の反応により末端に遊離イソシアネート基を有するウレタンプレポリマーが得られる。
【0014】
ペンダントカルボキシル基を有するポリウレタンの製造は、このようにして得たウレタンプレポリマーをジメチロールプロピオン酸によって代表されるジヒドロキシモノカルボン酸と反応させることを含む。ジヒドロキシモノカルボン酸の2つの水酸基が優先的にウレタンプレポリマーの遊離イソシアネート基と反応し、ウレタン結合を生成してプレポリマーを鎖延長する。ジヒドロキシモノカルボン酸のカルボキシル基はポリウレタン中にペンダント基として導入され、中和によって最終ポリウレタンを水溶性または自己乳化性とするのに役立つ、鎖中にペンダントカルボキシル基を有するポリウレタン樹脂a)を与える。
【0015】
ジメチロールプロピオン酸に代えてジメチロール酢酸、ジメチロールブタン酸、ジメチロールペンタン酸のような他のジヒドロキシアルカン酸をペンダントカルボキシル基の導入に使用しても良い。
【0016】
ペンダントカルボキシル基を導入したウレタンプレポリマーを水で加水分解する代りに、1官能2級アミンを末端イソシアネート基を反応させるか、または2官能2級アミンを当量比2以上で末端イソシアネート基と反応させても良い。
【0017】
b)水溶性ポリエポキシ化合物:
b)成分は一般に低分子量脂肪族ポリオールのポリグリシジルエーテルであるが、添加した量において接着剤組成物の水相に溶解するのに十分に高い水中溶解度を持つ必要がある。これらは例えばデナコールEXシリーズの商品名のもとにナガセケムテックス(株)から市販されており、低分子量脂肪族ポリオールがソルビトール、グリセロール、ポリグリセロール、ペンタエリスリトール、トリメチロールプロパンなどであるポリグリシジルエーテルが入手可能である。それらのうち水溶率が20%以上、好ましくは40%以上、特に好ましくは80%以上でありかつ2官能以上、特に3官能以上のポリグリシジルエーテルが好ましい。これに該当する例は、デナコールEX−614B、デナコールEX−512、デナコールEX521、デナコールEX−313、デナコールEX421およびこれらに匹敵する他社からの市販品がある。
【0018】
c)複数のヒドラジノ基を有する化合物:
複数のヒドラジノ基−NHNH2 を有する化合物の典型例は芳香族または脂肪族ジカルボン酸のジヒドラジドである。これらは対応するジカルボン酸エステルとヒドラジンヒドラートとの反応によって得られる。先に2官能ポリエステルポリオールの酸成分として例示したジカルボン酸のジヒドラジド、特にアジピン酸ジヒドラジド、アゼライン酸ジヒドラジドおよびセバシン酸ジヒドラジドが好ましく、アジピン酸ジヒドラジドが最も好ましい。炭酸のジヒドラジドであるカルボヒドラジドでも良い。
【0019】
本発明の水系ポリウレタン接着剤は、上のa)成分、b)成分、c)成分およびd)成分を水性媒体に溶解もしくは分散した組成物である。中和剤は水酸化ナトリウム、水酸化カリウム、アンモニアのような無機塩基またはトリエチルアミンのような3級アミンである。中和剤によるa)成分の中和は、a)成分の合成時にペンダントカルボキシル基の導入のために使用するジヒドロキシカルボン酸例えばジメチロールプロピオン酸を中和して反応させ、既に中和されたa)成分として得ても良い。b)成分およびc)成分は共に水溶性であるため、中和されたa)成分の水溶液もしくは水分散液へ添加する時その水相へ容易に溶解する。
【0020】
最終接着剤組成において、固形分に換算して、a)成分100重量部あたり、b)成分は1〜20重量部、c)成分は0.01〜10重量部それぞれ含まれていることが好ましい。
【0021】
本発明の接着剤を用いてフィルムをラミネートするには、ラミネートすべきフィルムまたは金属箔の接着面に接着剤を塗布し、十分に乾燥して水分を除去した後、塗布層を内側にしてフィルム同志またはフィルムと箔を加圧して張り合わせる。ラミネートはその後必要に応じてフィルムのガラス転位温度以下の温度で各成分間の化学反応によって十分な接着強度に達するまで養生(熱処理)される。
【0022】
上でいう各成分間の化学反応とは、a)成分中のペンダントカルボキシル基とb)成分中のエポキシ基との反応およびc)成分中のヒドラジノ基とb)成分中のエポキシ基との反応を意味し、これら反応が同時に起って複数のエポキシ基の開環によってa)成分、b)成分およびc)成分のすべてが同じ分子鎖へ導入されることになる。
【0023】
ラミネートフィルムは食品分野において密封包装のために広く使用されている。例えばレトルト食品のように内容食品を再加熱する場合のみならず、ハムやソーセージ等の再加熱されない食品でも内容物を熱水や水蒸気で熱滅菌する必要がある。本発明の接着剤を使用して製造されたラミネートはそのような苛酷な条件下での滅菌操作にも耐えられる十分な剥離強度を持っている。
【0024】
【実施例】
以下に限定を意図しない実施例によって本発明を具体的に説明する。その中の「部」および「%」は特記しない限り重量基準による。
【0025】
【ポリエステルポリオール】
表1に示す配合により、高分子ポリオールA〜Dを調製した。
(ポリエステルポリオールA)
3−メチル−1,5−ペンタンジオール317.2g、テレフタル酸174g、アジピン酸146gを反応器に仕込み、常圧下、窒素ガスを通じつつ、200℃で生成する水を反応系外に留去しながらエステル化反応を行った。ポリエステルの酸価が1.0mgKOH/gになった時点で真空ポンプにより、徐々に真空度を上げて反応を完結させた。得られたポリエステルポリオール(以下ポリエステルポリオールA)の水酸基価56.1mgKOH/g、酸価は0.2mgKOH/g、数平均分子量(水酸基価より算出した)は2000であった。
【0026】
【ポリエステルポリオールB〜D】
ポリエステルポリオールB〜Dについても、上記ポリエステルポリオールAと同様にして調製した。
【0027】
【表1】
【0028】
【水系ポリウレタンの合成】
合成例1
温度計、攪拌機、窒素導入管、冷却管の備えた2000mlの四つ口フラスコに、アジピン酸とテレフタル酸、3−メチル−1,5ペンタンジオールからなる数平均分子量2000、水酸基価56.1(mgKOH/g)のポリエステルポリオールA840g、トリレンジイソシアネート119g、メチルエチルケトンを200g入れ、窒素を導入しながら75℃で1時間反応させた。反応終了後、60℃まで冷却し、ジメチロールプロピオン酸を41g、トリエチルアミンを1.54g、メチルエチルケトンを300g加え75℃で2時間反応させた。次いでこのプレポリマーを40℃まで冷却し10%水酸化ナトリウム水溶液を42.8gを加え、30分攪拌し、加水分解を行なった。その後、水1127gを加え、ホモミキサーで高速攪拌することにより乳化を行なった。この乳化液から加熱減圧下に、メチルエチルケトンを留去し、固形分50%の合成例1の水系ポリウレタン樹脂溶液を得た。
【0029】
合成例2
温度計、攪拌機、窒素導入管、冷却管の備えた2000mlの四つ口フラスコに、アジピン酸とイソフタル酸、3−メチル−1,5ペンタンジオールからなる数平均分子量2000、水酸基価56.1(mgKOH/g)のポリエステルポリオールB820g、イソホロンジイソシアネート141g、メチルエチルケトンを200g入れ、窒素を導入しながら75℃で1時間反応させた。反応終了後、60℃まで冷却し、ジメチロールプロピオン酸を39g、トリエチルアミンを11.75g、メチルエチルケトンを300g加え75℃で2時間反応させた。次いでこのプレポリマーを40℃まで冷却し、次いで水1127gを加え、ホモミキサーで高速攪拌することにより乳化を行なった。この乳化液から加熱減圧下に、メチルエチルケトンを留去し、固形分50%の合成例2の水系ポリウレタン樹脂溶液を得た。
【0030】
合成例3
無水フタル酸、3−メチル−1,5ペンタンジオールからなる数平均分子量2000、水酸基価56.1(mgKOH/g)のポリエステルポリオールC820g、イソホロンジイソシアネート141g、メチルエチルケトンを200g入れ、窒素を導入しながら75℃で1時間反応させた。反応終了後、60℃まで冷却し、ジメチロールプロピオン酸を39g、トリエチルアミンを11.75g、メチルエチルケトンを300g加え75℃で2時間反応させた。次いでこのプレポリマーを40℃まで冷却し、次いで水1127gを加え、ホモミキサーで高速攪拌することにより乳化を行なった。この乳化液から加熱減圧下に、メチルエチルケトンを留去し、固形分50%の合成例3の水系ポリウレタン樹脂溶液を得た。
【0031】
合成例4
無水フタル酸、3−メチル−1,5−ペンタンジオールからなる数平均分子量3000、水酸基価37.4(mgKOH/g)のポリエステルポリオールDを848g、イソホロンジイソシアネート112.4g、メチルエチルケトンを300g入れ、窒素を導入しながら75℃で1時間反応させた。反応終了後、60℃まで冷却し、ジメチロールプロピオン酸を39.5gメチルエチルケトンを150g加え75℃で3時間反応させた。次いでこのプレポリマーを40℃まで冷却し、次いで29%アンモニア水溶液を8.63g、水1127gを加え、ホモミキサーで高速攪拌することにより乳化を行なった。この乳化液から加熱減圧下により、メチルエチルケトンを留去し、固形分50%の合成例4の水系ポリウレタン樹脂溶液を得た。
【0032】
合成例5
無水フタル酸とアジピン酸、3−メチル−1,5−ペンタンジオールからなる数平均分子量2000、水酸基価56.1(mgKOH/g)のポリエステルポリオールEを820g、イソホロンジイソシアネート141g、メチルエチルケトンを300g入れ、窒素を導入しながら75℃で1時間反応させた。反応終了後、60℃まで冷却し、ジメチロールプロピオン酸を39g、メチルエチルケトンを150g加え75℃で3時間反応させた。次いでこのプレポリマーを40℃まで冷却し、次いで29%アンモニア水溶液を8.52g、水1127gを加え、ホモミキサーで高速攪拌することにより乳化を行なった。この乳化液から加熱減圧下により、メチルエチルケトンを留去し、固形分50%の合成例5の水系ポリウレタン樹脂溶液を得た。
【0033】
【水系ポリウレタン樹脂をラミネート接着剤の調製】
実施例1
上記により得られたポリウレタン樹脂固形分100部に対し、エポキシ化合物(デナコールEX−614BまたはデナコールEX−421:ナガセケムテックス(株)社製)およびアジピン酸ジヒドラジドを表1および表2に示す配合量により加え、この配合組成物を常温で攪拌混合し、実施例1〜7並びに比較例1〜2のラミネート接着剤とした。
【0034】
【耐レトルト試験】
20μmのNyフィルム(延伸ナイロンフィルム/コロナ放電処理面)に接着剤を固形分で4.0g/m2 でバーコーター塗布し、80℃で15秒間乾燥させた。乾燥後、その上に20μmのCPP(未延伸プロピレンフィルム/コロナ放電処理面)を3.0kg/cm2でラミネートした。これを40℃で48時間養生を行った。このラミネートフィルムを120℃の加圧熱水中で30分間加熱してレトルト処理した。同じく、20μmのアルミフィルムに接着剤を固形分で4.0g/m2 でバーコーター塗布し、80℃で15秒間乾燥させた。乾燥後、その上に20μmのCPP(未延伸プロピレンフィルム/コロナ放電処理面)を3.0kg/cm2 でラミネートした。これを養生、レトルト処理した。その評価結果を表2および表3に示した。
【0035】
【剥離試験】
上記により得られたラミネートフィルムをテンシロン万能試験機((株)オリエンテック製)を使用し、レトルト前とレトルト処理後のラミネートされている両フィルムをT型剥離させた時の剥離強度(引張り速度50mm/min、単位N/15mm)を測定し、その数値を表2および表3に示した。
【0036】
【表2】
【0037】
【表3】
[0001]
【Technical field】
The present invention relates to an adhesive used for producing a laminate of a plurality of plastic films or a laminate of a plastic film and a metal foil, and more particularly to an adhesive mainly composed of an aqueous polyurethane resin.
[0002]
[Prior art and problems]
Several different properties are required for films used as packaging materials. Since it is difficult to have all of these different properties in a single film, it is difficult to have multiple different properties by laminating multiple plastic films or plastic films with individual different properties and metal foil. Can be. For example, a polyethylene film or a polypropylene film can be heat-sealed, but has poor impermeability to water and water vapor. Conversely, nylon (polyamide) films and metal foils have low moisture permeability, but heat sealing is difficult or impossible. Laminates of polyethylene or polypropylene films with nylon films or metal foils are heat sealable and have low water vapor permeability.
[0003]
In this way, films of different materials or films and foils are bonded to a laminate using an adhesive. However, since the chemical affinity between different materials is low, especially polyolefin resins do not have polar groups, in order to obtain high adhesive strength, polar groups are formed on the surface by, for example, corona discharge (plasma treatment) before lamination. Pre-processing such as performing is necessary. Instead of or in addition to such pretreatment, it is desired that the chemical composition of the adhesive used be improved to increase the adhesive strength. Further, as an adhesive, particularly an adhesive for lamination for food and beverage use, a system containing no organic solvent is desirable from an environmental and sanitary viewpoint.
[0004]
Laminating adhesives based on aqueous polyurethane resins are one of the candidates that meet many of these needs. However, it is difficult for the water-based polyurethane resin alone to obtain a high adhesive strength that can withstand sever conditions such as a laminate for retort food packaging.
[0005]
Laminating adhesives containing a water-based polyurethane resin as a main component can be found in Japanese Patent No. 3001358, the patent documents cited therein, and JP-A-2002-285124. In these, the polyurethane resin has a pendant carboxyl group to make it water-soluble or self-emulsifying in water by neutralization, the former contains a hydrazino compound in which the polyurethane resin has reacted with its precursor prepolymer, and the latter contains an aqueous It contains a polyurethane resin, a poorly water-soluble epoxy resin, and an acid hydrazide or imidazole compound having a hydantoin skeleton as a curing agent for the epoxy resin. However, the adhesives according to the prior art require complicated operations in production, tend to phase-separate or gel during storage, and have an unsatisfactory adhesive strength under severe conditions, for example, at 120 ° C. for 30 minutes in hot water.
[0006]
It is therefore an object of the present invention to provide a water-based polyurethane laminate adhesive which can improve the prior art laminate adhesives, can be manufactured by simpler operations, and shows satisfactory adhesive strength under severe conditions. .
[0007]
[Means for solving the problem]
The present invention provides a method for dissolving or dispersing in an aqueous
a) a polyurethane resin having a pendant carboxyl group in the chain,
b) a water-soluble polyepoxy compound,
c) a compound having a plurality of hydrazino groups, and d) a neutralizing agent,
The present invention provides a water-based polyurethane laminate adhesive characterized by comprising:
[0008]
The laminate adhesive of the present invention can be manufactured by a simple operation as compared with the prior art, and has an advantage that a sufficient adhesive strength that can withstand heating under severe conditions is obtained.
[0009]
[Preferred embodiment]
a) Polyurethane resin having pendant carboxyl groups in the chain:
The component a) can be produced starting from a urethane prepolymer. As is well known, urethane prepolymers can be prepared by reacting a polyether polyol or polyester polyol with a polyisocyanate compound. Although any polyether polyol or polyester polyol and any polyisocyanate compound can be used, in the present invention, it is preferable to use a bifunctional polyester polyol and a bifunctional polyisocyanate compound.
[0010]
The bifunctional polyester polyol can be produced by a polycondensation reaction using n mol of dicarboxylic acid as an acid component and n + 1 mol of dihydric alcohol as an alcohol component. The dicarboxylic acids that can be used include aromatic dicarboxylic acids such as phthalic anhydride, isophthalic acid and terephthalic acid, alicyclic dicarboxylic acids such as hydrogenated aromatic dicarboxylic acids such as tetra- or hexahydrophthalic acid, adipic acid , Aliphatic dicarboxylic acids such as azelaic acid and sebacic acid, and mixtures of these dicarboxylic acids, and are preferred. Examples of dihydric alcohols are ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6 Although it includes -hexanediol and the like, glycol having a side chain and having a primary alcoholic hydroxyl group at both ends such as 3-methyl-1,5-pentanediol and neopentyl glycol is particularly preferable. 3-Methyl-1,5-pentanediol is most preferred.
[0011]
The bifunctional polyester polyol preferably has a number average molecular weight of 1,000 to 5,000 and a corresponding hydroxyl value, and particularly preferably has a number average molecular weight of about 2000 to 3000 and a hydroxyl value of about 35 to 60 mg KOH / g. Have.
[0012]
Diisocyanate compounds used in the production of polyurethanes are well known. Examples are aromatic diisocyanates such as tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), xylylene diisocyanate (XDI), cycloaliphatic diisocyanates such as isophorone diisocyanate (IPDI), and hexamethylene diisocyanate (HMDI). Such aliphatic diisocyanates.
[0013]
A urethane prepolymer having a free isocyanate group at a terminal can be obtained by reacting n moles of a bifunctional polyester polyol with n + 1 moles of a diisocyanate compound.
[0014]
The preparation of polyurethanes having pendant carboxyl groups involves reacting the urethane prepolymer thus obtained with a dihydroxymonocarboxylic acid represented by dimethylolpropionic acid. The two hydroxyl groups of the dihydroxymonocarboxylic acid preferentially react with the free isocyanate groups of the urethane prepolymer to form urethane bonds and chain extend the prepolymer. The carboxyl groups of the dihydroxymonocarboxylic acid are introduced as pendant groups into the polyurethane, giving a polyurethane resin a) with pendant carboxyl groups in the chain, which serves to render the final polyurethane water-soluble or self-emulsifying by neutralization.
[0015]
Instead of dimethylolpropionic acid, other dihydroxyalkanoic acids such as dimethylolacetic acid, dimethylolbutanoic acid, and dimethylolpentanoic acid may be used for introducing pendant carboxyl groups.
[0016]
Instead of hydrolyzing the urethane prepolymer into which a pendant carboxyl group is introduced with water, a monofunctional secondary amine is reacted with a terminal isocyanate group, or a bifunctional secondary amine is reacted with a terminal isocyanate group at an equivalent ratio of 2 or more. May be.
[0017]
b) Water-soluble polyepoxy compound:
Component b) is generally a polyglycidyl ether of a low molecular weight aliphatic polyol, but must have a sufficiently high solubility in water to dissolve in the aqueous phase of the adhesive composition in the amount added. These are commercially available, for example, from Nagase ChemteX Corp. under the trade name of Denacol EX series, and the polyglycidyl ether whose low molecular weight aliphatic polyol is sorbitol, glycerol, polyglycerol, pentaerythritol, trimethylolpropane, etc. Is available. Among them, polyglycidyl ethers having a water solubility of 20% or more, preferably 40% or more, particularly preferably 80% or more, and bifunctional or more, particularly trifunctional or more are preferred. Examples which correspond to this include Denacol EX-614B, Denacol EX-512, Denacol EX521, Denacol EX-313, Denacol EX421, and commercially available products from other companies.
[0018]
c) Compound having a plurality of hydrazino groups:
Typical examples of compounds having a plurality of hydrazino groups -NHNH 2 is a dihydrazide aromatic or aliphatic dicarboxylic acids. These are obtained by reaction of the corresponding dicarboxylic acid esters with hydrazine hydrate. The dihydrazides of dicarboxylic acids exemplified above as the acid component of the bifunctional polyester polyol, particularly, adipic dihydrazide, azelaic dihydrazide and sebacic dihydrazide are preferred, and adipic dihydrazide is most preferred. Carbohydrazide, which is a carbonic dihydrazide, may be used.
[0019]
The aqueous polyurethane adhesive of the present invention is a composition in which the above components a), b), c) and d) are dissolved or dispersed in an aqueous medium. The neutralizing agent is an inorganic base such as sodium hydroxide, potassium hydroxide, ammonia or a tertiary amine such as triethylamine. The neutralization of the component a) by the neutralizing agent is carried out by neutralizing and reacting a dihydroxycarboxylic acid such as dimethylolpropionic acid used for introducing a pendant carboxyl group during the synthesis of the component a). ) May be obtained as a component. Since both component b) and component c) are water-soluble, they are readily dissolved in the aqueous phase when added to the neutralized aqueous solution or aqueous dispersion of component a).
[0020]
In the final adhesive composition, it is preferable that 1) to 20 parts by weight of the b) component and 0.01 to 10 parts by weight of the c) component are contained per 100 parts by weight of the component a) in terms of solid content. .
[0021]
To laminate a film using the adhesive of the present invention, apply the adhesive to the adhesive surface of the film or metal foil to be laminated, after drying sufficiently to remove moisture, the film with the coating layer inside Combine or press film and foil together. The laminate is then cured (heat treated) at a temperature below the glass transition temperature of the film, if necessary, until a sufficient adhesive strength is reached by a chemical reaction between the components.
[0022]
The chemical reaction between the components mentioned above means the reaction between the pendant carboxyl group in the component a) and the epoxy group in the component b) and the reaction between the hydrazino group in the component c) and the epoxy group in the component b). These reactions occur simultaneously, and all of the components a), b) and c) are introduced into the same molecular chain by ring opening of a plurality of epoxy groups.
[0023]
Laminate films are widely used for hermetic packaging in the food field. For example, not only when the content food is reheated such as a retort food, but also when the food is not reheated such as ham and sausage, the content needs to be heat sterilized with hot water or steam. Laminates made using the adhesives of the present invention have sufficient peel strength to withstand sterilization operations under such harsh conditions.
[0024]
【Example】
Hereinafter, the present invention will be described in detail with reference to Examples, which are not intended to limit the present invention. “Parts” and “%” therein are based on weight unless otherwise specified.
[0025]
[Polyester polyol]
Polymer polyols A to D were prepared according to the formulations shown in Table 1.
(Polyester polyol A)
317.2 g of 3-methyl-1,5-pentanediol, 174 g of terephthalic acid, and 146 g of adipic acid were charged into a reactor, and water generated at 200 ° C. was distilled out of the reaction system while passing nitrogen gas under normal pressure. An esterification reaction was performed. When the acid value of the polyester reached 1.0 mgKOH / g, the degree of vacuum was gradually increased by a vacuum pump to complete the reaction. The obtained polyester polyol (hereinafter referred to as polyester polyol A) had a hydroxyl value of 56.1 mgKOH / g, an acid value of 0.2 mgKOH / g, and a number average molecular weight (calculated from the hydroxyl value) of 2,000.
[0026]
[Polyester polyols B to D]
Polyester polyols B to D were also prepared in the same manner as polyester polyol A described above.
[0027]
[Table 1]
[0028]
[Synthesis of water-based polyurethane]
Synthesis Example 1
In a 2000 ml four-necked flask equipped with a thermometer, a stirrer, a nitrogen inlet tube, and a cooling tube, a number average molecular weight of 2,000 consisting of adipic acid, terephthalic acid and 3-methyl-1,5 pentanediol, a hydroxyl value of 56.1 ( mgKOH / g) of polyester polyol A (840 g), tolylene diisocyanate (119 g), and methyl ethyl ketone (200 g) were added, and the mixture was reacted at 75 ° C. for 1 hour while introducing nitrogen. After completion of the reaction, the mixture was cooled to 60 ° C., 41 g of dimethylolpropionic acid, 1.54 g of triethylamine, and 300 g of methyl ethyl ketone were added and reacted at 75 ° C. for 2 hours. Next, the prepolymer was cooled to 40 ° C., and 42.8 g of a 10% aqueous sodium hydroxide solution was added thereto, followed by stirring for 30 minutes to effect hydrolysis. Thereafter, 1127 g of water was added and emulsification was performed by high-speed stirring with a homomixer. Methyl ethyl ketone was distilled off from this emulsion under heating and reduced pressure to obtain an aqueous polyurethane resin solution of Synthesis Example 1 having a solid content of 50%.
[0029]
Synthesis Example 2
In a 2000 ml four-necked flask equipped with a thermometer, a stirrer, a nitrogen inlet tube, and a cooling tube, a number average molecular weight of 2,000 consisting of adipic acid, isophthalic acid and 3-methyl-1,5-pentanediol, a hydroxyl value of 56.1 ( (mgKOH / g) of polyester polyol B (820 g), isophorone diisocyanate (141 g), and methyl ethyl ketone (200 g) were added thereto and reacted at 75 ° C. for 1 hour while introducing nitrogen. After completion of the reaction, the mixture was cooled to 60 ° C., 39 g of dimethylolpropionic acid, 11.75 g of triethylamine and 300 g of methyl ethyl ketone were added, and the mixture was reacted at 75 ° C. for 2 hours. Next, this prepolymer was cooled to 40 ° C., and 1127 g of water was added, followed by high-speed stirring with a homomixer to emulsify. Methyl ethyl ketone was distilled off from this emulsion under heating and reduced pressure to obtain an aqueous polyurethane resin solution of Synthesis Example 2 having a solid content of 50%.
[0030]
Synthesis Example 3
820 g of a polyester polyol C having a number average molecular weight of 2,000 and a hydroxyl value of 56.1 (mg KOH / g) composed of phthalic anhydride and 3-methyl-1,5-pentanediol, 141 g of isophorone diisocyanate, and 200 g of methyl ethyl ketone were added. The reaction was carried out at a temperature of 1 ° C. for 1 hour. After completion of the reaction, the mixture was cooled to 60 ° C., 39 g of dimethylolpropionic acid, 11.75 g of triethylamine and 300 g of methyl ethyl ketone were added, and the mixture was reacted at 75 ° C. for 2 hours. Next, this prepolymer was cooled to 40 ° C., and 1127 g of water was added, followed by high-speed stirring with a homomixer to emulsify. Methyl ethyl ketone was distilled off from this emulsion under heating and reduced pressure to obtain an aqueous polyurethane resin solution of Synthesis Example 3 having a solid content of 50%.
[0031]
Synthesis Example 4
848 g of polyester polyol D having a number average molecular weight of 3,000 composed of phthalic anhydride and 3-methyl-1,5-pentanediol and a hydroxyl value of 37.4 (mg KOH / g), 112.4 g of isophorone diisocyanate, 300 g of methyl ethyl ketone, and nitrogen were added. Was reacted at 75 ° C. for 1 hour. After completion of the reaction, the mixture was cooled to 60 ° C., 39.5 g of dimethylolpropionic acid was added, and 150 g of methyl ethyl ketone were added, and the mixture was reacted at 75 ° C. for 3 hours. Next, the prepolymer was cooled to 40 ° C., and then 8.63 g of a 29% aqueous ammonia solution and 1127 g of water were added, followed by high-speed stirring with a homomixer to emulsify. Methyl ethyl ketone was distilled off from this emulsion under heating and reduced pressure to obtain an aqueous polyurethane resin solution of Synthesis Example 4 having a solid content of 50%.
[0032]
Synthesis Example 5
820 g of polyester polyol E having a number average molecular weight of phthalic anhydride, adipic acid, and 3-methyl-1,5-pentanediol of 2,000 and a hydroxyl value of 56.1 (mg KOH / g), 141 g of isophorone diisocyanate, and 300 g of methyl ethyl ketone were added. The reaction was carried out at 75 ° C. for 1 hour while introducing nitrogen. After completion of the reaction, the mixture was cooled to 60 ° C., and 39 g of dimethylolpropionic acid and 150 g of methyl ethyl ketone were added and reacted at 75 ° C. for 3 hours. Next, this prepolymer was cooled to 40 ° C., then 8.52 g of a 29% aqueous ammonia solution and 1127 g of water were added, and emulsification was performed by high-speed stirring with a homomixer. Methyl ethyl ketone was distilled off from this emulsion under heating and reduced pressure to obtain an aqueous polyurethane resin solution of Synthesis Example 5 having a solid content of 50%.
[0033]
[Preparation of aqueous polyurethane resin laminate adhesive]
Example 1
An epoxy compound (Denacol EX-614B or Denacol EX-421: manufactured by Nagase ChemteX Corp.) and adipic dihydrazide are added to 100 parts of the solid content of the polyurethane resin obtained as described above, as shown in Tables 1 and 2. And the mixture was stirred and mixed at room temperature to obtain a laminate adhesive of Examples 1 to 7 and Comparative Examples 1 and 2.
[0034]
[Retort resistance test]
An adhesive was applied to a 20 μm Ny film (stretched nylon film / corona discharge treated surface) with a bar coater at a solid content of 4.0 g / m 2 and dried at 80 ° C. for 15 seconds. After drying, 20 μm of CPP (unstretched propylene film / corona discharge treated surface) was laminated thereon at 3.0 kg / cm 2 . This was cured at 40 ° C. for 48 hours. This laminated film was heated in pressurized hot water at 120 ° C. for 30 minutes and retorted. Similarly, a 20 μm aluminum film was coated with an adhesive at a solid content of 4.0 g / m 2 using a bar coater, and dried at 80 ° C. for 15 seconds. After drying, 20 μm of CPP (unstretched propylene film / corona discharge treated surface) was laminated thereon at 3.0 kg / cm 2 . This was cured and retorted. The evaluation results are shown in Tables 2 and 3.
[0035]
[Peeling test]
Using a laminated film obtained as described above, a Tensilon universal testing machine (manufactured by Orientec Co., Ltd.), and the peel strength (pulling speed) when both the laminated films before and after the retort treatment were peeled in a T-shape. 50 mm / min, unit N / 15 mm), and the numerical values are shown in Tables 2 and 3.
[0036]
[Table 2]
[0037]
[Table 3]
Claims (11)
a)鎖中にペンダントカルボキシル基を有するポリウレタン樹脂、
b)水溶性ポリエポキシ化合物、
c)複数のヒドラジノ基を有する化合物、および
d)中和剤、
を含んでいることを特徴とする水系ポリウレタンラミネート接着剤。Dissolved or dispersed in an aqueous medium,
a) a polyurethane resin having a pendant carboxyl group in the chain,
b) a water-soluble polyepoxy compound,
c) a compound having a plurality of hydrazino groups, and d) a neutralizing agent,
An aqueous polyurethane laminate adhesive, comprising:
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2007031585A (en) * | 2005-07-27 | 2007-02-08 | Jsr Corp | Pressure-sensitive adhesive resin composition and its production process, pressure-sensitive adhesive article, and pressure-sensitive adhesive sheet |
WO2013083456A1 (en) * | 2011-12-09 | 2013-06-13 | Basf Se | Use of aqueous polyurethane dispersions for composite film lamination |
US9005762B2 (en) | 2011-12-09 | 2015-04-14 | Basf Se | Use of aqueous polyurethane dispersions for composite foil lamination |
CN106986975A (en) * | 2017-05-11 | 2017-07-28 | 上海回天新材料有限公司 | A kind of preparation method of polyurethane laminating adhesive |
WO2021024981A1 (en) * | 2019-08-06 | 2021-02-11 | 凸版印刷株式会社 | Curing agent, two-component adhesive, adhesive composition, cured product, laminate and method for producing same, packing material, and packed body |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2007031585A (en) * | 2005-07-27 | 2007-02-08 | Jsr Corp | Pressure-sensitive adhesive resin composition and its production process, pressure-sensitive adhesive article, and pressure-sensitive adhesive sheet |
WO2013083456A1 (en) * | 2011-12-09 | 2013-06-13 | Basf Se | Use of aqueous polyurethane dispersions for composite film lamination |
CN103975034A (en) * | 2011-12-09 | 2014-08-06 | 巴斯夫欧洲公司 | Use of aqueous polyurethane dispersions for composite film lamination |
JP2015507643A (en) * | 2011-12-09 | 2015-03-12 | ビーエーエスエフ ソシエタス・ヨーロピアBasf Se | Use of aqueous polyurethane dispersions for laminating composite sheets |
US9005762B2 (en) | 2011-12-09 | 2015-04-14 | Basf Se | Use of aqueous polyurethane dispersions for composite foil lamination |
CN103975034B (en) * | 2011-12-09 | 2016-10-19 | 巴斯夫欧洲公司 | Aqueous pu dispersions is for the purposes of composite membrane lamination |
CN106986975A (en) * | 2017-05-11 | 2017-07-28 | 上海回天新材料有限公司 | A kind of preparation method of polyurethane laminating adhesive |
WO2021024981A1 (en) * | 2019-08-06 | 2021-02-11 | 凸版印刷株式会社 | Curing agent, two-component adhesive, adhesive composition, cured product, laminate and method for producing same, packing material, and packed body |
JPWO2021024981A1 (en) * | 2019-08-06 | 2021-09-13 | 凸版印刷株式会社 | Curing agent, two-component adhesive, adhesive composition, cured product, laminate and its manufacturing method, packaging material, and packaging |
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