JP2004122514A - Heat shrinkable multilayer film - Google Patents
Heat shrinkable multilayer film Download PDFInfo
- Publication number
- JP2004122514A JP2004122514A JP2002288332A JP2002288332A JP2004122514A JP 2004122514 A JP2004122514 A JP 2004122514A JP 2002288332 A JP2002288332 A JP 2002288332A JP 2002288332 A JP2002288332 A JP 2002288332A JP 2004122514 A JP2004122514 A JP 2004122514A
- Authority
- JP
- Japan
- Prior art keywords
- aromatic hydrocarbon
- vinyl aromatic
- copolymer
- heat
- polymer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- -1 vinyl aromatic hydrocarbon Chemical class 0.000 claims abstract description 93
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 88
- 229920000642 polymer Polymers 0.000 claims abstract description 47
- 229920001400 block copolymer Polymers 0.000 claims abstract description 40
- 229920001577 copolymer Polymers 0.000 claims abstract description 38
- 150000001993 dienes Chemical class 0.000 claims abstract description 28
- 239000000203 mixture Substances 0.000 claims abstract description 20
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229920005989 resin Polymers 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 15
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 11
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 6
- 229930195733 hydrocarbon Natural products 0.000 claims description 5
- 150000003440 styrenes Chemical class 0.000 claims description 5
- 239000004215 Carbon black (E152) Substances 0.000 claims description 4
- 239000004793 Polystyrene Substances 0.000 claims description 4
- 150000002430 hydrocarbons Chemical class 0.000 claims description 4
- 229920002223 polystyrene Polymers 0.000 claims description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 4
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229920003145 methacrylic acid copolymer Polymers 0.000 claims description 3
- 229940117841 methacrylic acid copolymer Drugs 0.000 claims description 3
- 229920006163 vinyl copolymer Polymers 0.000 claims description 3
- 229920007962 Styrene Methyl Methacrylate Polymers 0.000 claims description 2
- ADFPJHOAARPYLP-UHFFFAOYSA-N methyl 2-methylprop-2-enoate;styrene Chemical compound COC(=O)C(C)=C.C=CC1=CC=CC=C1 ADFPJHOAARPYLP-UHFFFAOYSA-N 0.000 claims description 2
- JQXYBDVZAUEPDL-UHFFFAOYSA-N 2-methylidene-5-phenylpent-4-enoic acid Chemical compound OC(=O)C(=C)CC=CC1=CC=CC=C1 JQXYBDVZAUEPDL-UHFFFAOYSA-N 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 35
- 238000000034 method Methods 0.000 description 23
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 14
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 12
- 238000006116 polymerization reaction Methods 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000000178 monomer Substances 0.000 description 7
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 6
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- AFHIIJICYLMCSH-VOTSOKGWSA-N 5-amino-2-[(e)-2-(4-benzamido-2-sulfophenyl)ethenyl]benzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC(N)=CC=C1\C=C\C(C(=C1)S(O)(=O)=O)=CC=C1NC(=O)C1=CC=CC=C1 AFHIIJICYLMCSH-VOTSOKGWSA-N 0.000 description 5
- 230000009477 glass transition Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000000379 polymerizing effect Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 125000005250 alkyl acrylate group Chemical group 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 150000002642 lithium compounds Chemical class 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 239000000806 elastomer Substances 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 238000005227 gel permeation chromatography Methods 0.000 description 3
- 239000003999 initiator Substances 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- RGSFGYAAUTVSQA-UHFFFAOYSA-N Cyclopentane Chemical compound C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 description 2
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 2
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 2
- 229920006257 Heat-shrinkable film Polymers 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- 239000006057 Non-nutritive feed additive Substances 0.000 description 2
- 239000005062 Polybutadiene Substances 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 239000002216 antistatic agent Substances 0.000 description 2
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical compound C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000002170 ethers Chemical class 0.000 description 2
- IIEWJVIFRVWJOD-UHFFFAOYSA-N ethylcyclohexane Chemical compound CCC1CCCCC1 IIEWJVIFRVWJOD-UHFFFAOYSA-N 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920005669 high impact polystyrene Polymers 0.000 description 2
- 239000004797 high-impact polystyrene Substances 0.000 description 2
- QWTDNUCVQCZILF-UHFFFAOYSA-N isopentane Chemical compound CCC(C)C QWTDNUCVQCZILF-UHFFFAOYSA-N 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- UAEPNZWRGJTJPN-UHFFFAOYSA-N methylcyclohexane Chemical compound CC1CCCCC1 UAEPNZWRGJTJPN-UHFFFAOYSA-N 0.000 description 2
- GDOPTJXRTPNYNR-UHFFFAOYSA-N methylcyclopentane Chemical compound CC1CCCC1 GDOPTJXRTPNYNR-UHFFFAOYSA-N 0.000 description 2
- 239000002480 mineral oil Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229920006280 packaging film Polymers 0.000 description 2
- 239000012785 packaging film Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 description 2
- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical compound C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- AHAREKHAZNPPMI-AATRIKPKSA-N (3e)-hexa-1,3-diene Chemical compound CC\C=C\C=C AHAREKHAZNPPMI-AATRIKPKSA-N 0.000 description 1
- PMJHHCWVYXUKFD-SNAWJCMRSA-N (E)-1,3-pentadiene Chemical compound C\C=C\C=C PMJHHCWVYXUKFD-SNAWJCMRSA-N 0.000 description 1
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 description 1
- OEVVKKAVYQFQNV-UHFFFAOYSA-N 1-ethenyl-2,4-dimethylbenzene Chemical compound CC1=CC=C(C=C)C(C)=C1 OEVVKKAVYQFQNV-UHFFFAOYSA-N 0.000 description 1
- NVZWEEGUWXZOKI-UHFFFAOYSA-N 1-ethenyl-2-methylbenzene Chemical compound CC1=CC=CC=C1C=C NVZWEEGUWXZOKI-UHFFFAOYSA-N 0.000 description 1
- UVHXEHGUEKARKZ-UHFFFAOYSA-N 1-ethenylanthracene Chemical compound C1=CC=C2C=C3C(C=C)=CC=CC3=CC2=C1 UVHXEHGUEKARKZ-UHFFFAOYSA-N 0.000 description 1
- IGGDKDTUCAWDAN-UHFFFAOYSA-N 1-vinylnaphthalene Chemical compound C1=CC=C2C(C=C)=CC=CC2=C1 IGGDKDTUCAWDAN-UHFFFAOYSA-N 0.000 description 1
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- DBWWINQJTZYDFK-UHFFFAOYSA-N 2-ethenyl-1,4-dimethylbenzene Chemical compound CC1=CC=C(C)C(C=C)=C1 DBWWINQJTZYDFK-UHFFFAOYSA-N 0.000 description 1
- CRWNQZTZTZWPOF-UHFFFAOYSA-N 2-methyl-4-phenylpyridine Chemical compound C1=NC(C)=CC(C=2C=CC=CC=2)=C1 CRWNQZTZTZWPOF-UHFFFAOYSA-N 0.000 description 1
- CFVWNXQPGQOHRJ-UHFFFAOYSA-N 2-methylpropyl prop-2-enoate Chemical compound CC(C)COC(=O)C=C CFVWNXQPGQOHRJ-UHFFFAOYSA-N 0.000 description 1
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 1
- 101100255205 Caenorhabditis elegans rsa-2 gene Proteins 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerol Natural products OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- NHTMVDHEPJAVLT-UHFFFAOYSA-N Isooctane Chemical compound CC(C)CC(C)(C)C NHTMVDHEPJAVLT-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 241001483078 Phyto Species 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- STLLXWLDRUVCHL-UHFFFAOYSA-N [2-[1-[2-hydroxy-3,5-bis(2-methylbutan-2-yl)phenyl]ethyl]-4,6-bis(2-methylbutan-2-yl)phenyl] prop-2-enoate Chemical compound CCC(C)(C)C1=CC(C(C)(C)CC)=CC(C(C)C=2C(=C(C=C(C=2)C(C)(C)CC)C(C)(C)CC)OC(=O)C=C)=C1O STLLXWLDRUVCHL-UHFFFAOYSA-N 0.000 description 1
- IORUEKDKNHHQAL-UHFFFAOYSA-N [2-tert-butyl-6-[(3-tert-butyl-2-hydroxy-5-methylphenyl)methyl]-4-methylphenyl] prop-2-enoate Chemical compound CC(C)(C)C1=CC(C)=CC(CC=2C(=C(C=C(C)C=2)C(C)(C)C)OC(=O)C=C)=C1O IORUEKDKNHHQAL-UHFFFAOYSA-N 0.000 description 1
- ICKXMDGNIZPYRS-UHFFFAOYSA-N [Li]CCCCCC[Li] Chemical compound [Li]CCCCCC[Li] ICKXMDGNIZPYRS-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 150000004996 alkyl benzenes Chemical class 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 235000010354 butylated hydroxytoluene Nutrition 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000012986 chain transfer agent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 description 1
- SMBQBQBNOXIFSF-UHFFFAOYSA-N dilithium Chemical compound [Li][Li] SMBQBQBNOXIFSF-UHFFFAOYSA-N 0.000 description 1
- AFABGHUZZDYHJO-UHFFFAOYSA-N dimethyl butane Natural products CCCC(C)C AFABGHUZZDYHJO-UHFFFAOYSA-N 0.000 description 1
- JVSWJIKNEAIKJW-UHFFFAOYSA-N dimethyl-hexane Natural products CCCCCC(C)C JVSWJIKNEAIKJW-UHFFFAOYSA-N 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
- 238000010556 emulsion polymerization method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 description 1
- BLHLJVCOVBYQQS-UHFFFAOYSA-N ethyllithium Chemical compound [Li]CC BLHLJVCOVBYQQS-UHFFFAOYSA-N 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 238000010559 graft polymerization reaction Methods 0.000 description 1
- DMEGYFMYUHOHGS-UHFFFAOYSA-N heptamethylene Natural products C1CCCCCC1 DMEGYFMYUHOHGS-UHFFFAOYSA-N 0.000 description 1
- GNOIPBMMFNIUFM-UHFFFAOYSA-N hexamethylphosphoric triamide Chemical compound CN(C)P(=O)(N(C)C)N(C)C GNOIPBMMFNIUFM-UHFFFAOYSA-N 0.000 description 1
- LNMQRPPRQDGUDR-UHFFFAOYSA-N hexyl prop-2-enoate Chemical compound CCCCCCOC(=O)C=C LNMQRPPRQDGUDR-UHFFFAOYSA-N 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- UBJFKNSINUCEAL-UHFFFAOYSA-N lithium;2-methylpropane Chemical compound [Li+].C[C-](C)C UBJFKNSINUCEAL-UHFFFAOYSA-N 0.000 description 1
- WGOPGODQLGJZGL-UHFFFAOYSA-N lithium;butane Chemical compound [Li+].CC[CH-]C WGOPGODQLGJZGL-UHFFFAOYSA-N 0.000 description 1
- SZAVVKVUMPLRRS-UHFFFAOYSA-N lithium;propane Chemical compound [Li+].C[CH-]C SZAVVKVUMPLRRS-UHFFFAOYSA-N 0.000 description 1
- XBEREOHJDYAKDA-UHFFFAOYSA-N lithium;propane Chemical compound [Li+].CC[CH2-] XBEREOHJDYAKDA-UHFFFAOYSA-N 0.000 description 1
- 238000010551 living anionic polymerization reaction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 125000005641 methacryl group Chemical group 0.000 description 1
- GYNNXHKOJHMOHS-UHFFFAOYSA-N methyl-cycloheptane Natural products CC1CCCCCC1 GYNNXHKOJHMOHS-UHFFFAOYSA-N 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 150000002900 organolithium compounds Chemical class 0.000 description 1
- 238000005949 ozonolysis reaction Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 239000002530 phenolic antioxidant Substances 0.000 description 1
- 150000008039 phosphoramides Chemical class 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- PMJHHCWVYXUKFD-UHFFFAOYSA-N piperylene Natural products CC=CC=C PMJHHCWVYXUKFD-UHFFFAOYSA-N 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- SYXYWTXQFUUWLP-UHFFFAOYSA-N sodium;butan-1-olate Chemical compound [Na+].CCCC[O-] SYXYWTXQFUUWLP-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Landscapes
- Wrappers (AREA)
- Laminated Bodies (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
【課題】本発明は、剛性、熱収縮性及び耐ブロッキング性に優れた熱収縮性多層フィルムを提供することを目的とする。
【解決手段】(a)ビニル芳香族炭化水素と共役ジエンの質量比が50/50〜90/10、ビニル芳香族炭化水素のブロック率が85%以下であるビニル芳香族炭化水素と共役ジエンのブロック共重合体及び、必要に応じて(b)少なくとも一種の特定のビニル芳香族炭化水素系重合体を含有するブロック共重合体組成物を少なくとも1層、外層として(c)ビニル芳香族炭化水素とメタクリル酸の質量比が70/30〜99/1である共重合体及び、必要に応じて(d)少なくとも一種の特定のビニル芳香族炭化水素系重合体を含有する共重合体組成物を少なくとも1層有する積層体を延伸してなる熱収縮性多層フィルム。
【選択図】 なしAn object of the present invention is to provide a heat-shrinkable multilayer film excellent in rigidity, heat-shrinkability and blocking resistance.
(A) A mass ratio of a vinyl aromatic hydrocarbon to a conjugated diene is 50/50 to 90/10, and a block ratio of the vinyl aromatic hydrocarbon is 85% or less. At least one block copolymer composition containing a block copolymer and, if necessary, (b) at least one specific vinyl aromatic hydrocarbon-based polymer, and (c) a vinyl aromatic hydrocarbon as an outer layer And a copolymer having a mass ratio of methacrylic acid of 70/30 to 99/1 and, if necessary, (d) a copolymer composition containing at least one specific vinyl aromatic hydrocarbon-based polymer. A heat-shrinkable multilayer film obtained by stretching a laminate having at least one layer.
[Selection diagram] None
Description
【0001】
【発明の属する技術分野】
本発明は、剛性、熱収縮性、耐ブロッキング性に優れた熱収縮性多層フィルムに関する。
【0002】
【従来の技術】
従来、容器の収縮包装や収縮ラベルとして用いられる熱収縮性フィルムには、熱収縮性や収縮後の仕上がりがよく、廃棄の際にもポリ塩化ビニルのように環境負荷が大きくない点から、スチレン−ブタジエン系ブロック共重合体を成形したフィルムが用いられている。しかし、このフィルムはブタジエンを含有するため粘着性が高く、フィルム同士がブロッキングしやすいという問題がある。この問題を解決するために、特開昭52−130852号公報にはシリカゲルを、特開平1−304146号公報には炭化水素ワックスを添加する方法が開示されているが、これらの方法では耐ブロッキング性は改善されるものの、印刷性に劣るという欠点がある。また、このフィルムは柔らかく腰がないといった問題があり、これらの欠点を改良すべく各種多層フィルムが提案されている(特開平9−114380号公報、特開平11−77916号公報)。しかしながら、これらのフィルムでも耐ブロッキング性の課題がある。
【0003】
【特許文献1】
特開昭52−130852号公報
【特許文献2】
特開平1−304146号公報
【特許文献3】
特開平9−114380号公報
【特許文献4】
特開平11−77916号公報
【0004】
【発明が解決しようとする課題】
本発明は、上記のような状況を踏まえ、剛性、熱収縮性及び耐ブロッキング性に優れた熱収縮性多層フィルムを提供することを目的とする。
【0005】
【課題を解決するための手段】
本発明者らは、上記の課題を解決すべく鋭意研究を重ねた結果、特定のビニル芳香族炭化水素とメタクリル酸の共重合体を主体にした組成物を外層とし、特定のビニル芳香族炭化水素と共役ジエンの共重合体を主体にした組成物を他の層とすることにより、剛性、熱収縮性、耐ブロッキング性に優れた熱収縮性多層フィルムが得られることを見出し、本発明を完成するに至った。
【0006】
すなわち本発明は、2層または3層以上からなり、下記(c)及び、必要に応じて(d)を含有する共重合体組成物を外層として少なくとも1層有し、下記の(a)及び、必要に応じて(b)を含有するブロック共重合体組成物を少なくとも1層有する積層体を延伸してなる熱収縮性多層フィルムである。
(a)ビニル芳香族炭化水素と共役ジエンの質量比が50/50〜90/10、ビニル芳香族炭化水素のブロック率が85%以下であるビニル芳香族炭化水素と共役ジエンのブロック共重合体、
(b)下記の(i)〜(v)から選ばれた少なくとも一種のビニル芳香族炭化水素系重合体、
(i)(a)とは異なるビニル芳香族炭化水素と共役ジエンのブロック共重合体
(ii)ビニル芳香族炭化水素重合体
(iii)ビニル芳香族炭化水素と(メタ)アクリル酸からなる共重合体
(iv)ビニル芳香族炭化水素と(メタ)アクリル酸エステルからなる共重合体
(v)ゴム変性スチレン系重合体
(但し、前記(iii)及び(iv)においてビニル芳香族炭化水素とビニル芳香族炭化水素と共重合しているコモノマーの質量比は5〜99:95〜1である。)
(c)ビニル芳香族炭化水素とメタクリル酸の質量比が70/30〜99/1である共重合体
(d)下記の(i’)〜(v’)から選ばれた少なくとも一種のビニル芳香族炭化水素系重合体、
(i’)ビニル芳香族炭化水素と共役ジエンのブロック共重合体
(ii’)ビニル芳香族炭化水素重合体
(iii’)ビニル芳香族炭化水素とアクリル酸からなる共重合体
(iv’)ビニル芳香族炭化水素と(メタ)アクリル酸エステルからなる共重合体
(v’)ゴム変性スチレン系重合体
(但し、前記(iii’)及び(iv’)においてビニル芳香族炭化水素とビニル芳香族炭化水素と共重合しているコモノマーの質量比は5〜99:95〜1である。)
【0007】
以下に本発明を詳細に説明する。本発明で使用される(a)ビニル芳香族炭化水素と共役ジエンのブロック共重合体に用いられるビニル芳香族炭化水素としては、スチレン、o−メチルスチレン、p−メチルスチレン、p−tert−ブチルスチレン、2,4−ジメチルスチレン、2,5−ジメチルスチレン、α−メチルスチレン、ビニルナフタレン、ビニルアントラセン等を挙げることができるが、特に好ましくはスチレンが挙げられる。
【0008】
本発明で使用される(a)のブロック共重合体の製造に用いられる共役ジエンとしては、1,3−ブタジエン、2−メチル−1,3−ブタジエン(イソプレン)、2,3−ジメチル−1,3−ブタジエン、1,3−ペンタジエン、1,3−ヘキサジエン等が挙げられるが、特に好ましくは、1,3−ブタジエン、イソプレンが挙げられる。
【0009】
前記のビニル芳香族炭化水素と共役ジエンの質量比は、50/50〜90/10であり、好ましくは55/45〜85/15である。ビニル芳香族炭化水素の質量比が50質量%未満ではフィルムの剛性が、90質量%を超えるとフィルム製造時の延伸温度が高くなり、またフィルムの熱収縮性が劣るので実用に供せない。
【0010】
本発明で用いるブロック共重合体の構造および各ブロック部分の構造は、特に限定されない。ブロック共重合体の構造としては、ビニル芳香族炭化水素を主体とする重合体ブロック、共役ジエンを主体とする重合体ブロックからなる例えば直線型、星型等のブロック共重合体がある。また、ビニル芳香族炭化水素を主体とする重合体ブロックもしくは共役ジエンを主体とする重合体ブロック中にビニル芳香族炭化水素と共役ジエンの共重合体部分が存在する場合、共重合されているビニル芳香族炭化水素は重合体ブロック中に均一に分布していても、テーパー(漸減)状に分布していてもよい。
【0011】
(a)のブロック共重合体のビニル芳香族炭化水素のブロック率は85質量%以下であり、特に好ましくは25〜85%である。ブロック率が25質量%未満であるとフィルムの剛性が低下し、85質量%を超えると熱収縮性が低下するきらいがある。
なお、ビニル芳香族炭化水素のブロック率は次式により求めたものである。即ち、ブロック率(質量%)=(W1/W0)×100である。ここでW1は共重合体中のビニル芳香族炭化水素のブロック重合鎖の質量、W0はブロック共重合体中のビニル芳香族炭化水素の全質量を示す。また、前記式中のW1は、ブロック共重合体を公知文献「ラバーケミストリー アンド テクノロジー(Y.TANAKA,et.al.,RUBBERCHEMISTRY AND TECHNOLOGY)」58,16頁(1985)に記載の方法でオゾン分解し、得られたビニル芳香族炭化水素重合体成分をゲルパーミエーションクロマトグラフ(以下GPCと略す)測定して、クロマトグラムに対応する分子量を、標準ポリスチレン及びスチレンオリゴマーを用いて作成した検量線から求め、数平均分子量3,000を超えるものをピーク面積より定量して求めた。検出器として波長を254nmに設定した紫外分光検出器を使用した。
【0012】
本発明で使用される(a)のブロック共重合体の数平均分子量は好ましくは40,000〜500,000、特に好ましくは80,000〜300,000である。40,000未満ではブロック共重合体組成物の十分な剛性と耐衝撃性が得られず、また、500,000を越えると加工性が低下してしまうため好ましくない。なお、本発明におけるブロック共重合体の数平均分子量は、ゲルパーミエーションクロマトグラフ(以下GPCと略す)を用いて常法に従って求めた。
【0013】
次に、本発明の(a)のブロック共重合体の製造について説明する。(a)のブロック共重合体は、有機溶媒中、有機リチウム化合物を開始剤としてビニル芳香族炭化水素及び共役ジエンのモノマーを重合することにより製造できる。有機溶媒としてはブタン、ペンタン、ヘキサン、イソペンタン、ヘプタン、オクタン、イソオクタン等の脂肪族炭化水素、シクロペンタン、メチルシクロペンタン、シクロヘキサン、メチルシクロヘキサン、エチルシクロヘキサン等の脂環式炭化水素、あるいはエチルベンゼン、キシレン等の芳香族炭化水素などが使用できる。
【0014】
有機リチウム化合物は、分子中に1個以上のリチウム原子が結合した化合物であり、例えばエチルリチウム、n−プロピルリチウム、イソプロピルリチウム、n−ブチルリチウム、sec−ブチルリチウム、tert−ブチルリチウムのような単官能有機リチウム化合物、ヘキサメチレンジリチウム、ブタジエニルジリチウム、イソプレニルジリチウムのような多官能有機リチウム化合物等が使用できる。
【0015】
本発明に用いられるビニル芳香族炭化水素及び共役ジエンは、前記したものを使用することができ、それぞれ1種又は2種以上を選んで重合に用いることができる。そして、前記の有機リチウム化合物を開始剤とするリビングアニオン重合では、重合反応に供したビニル芳香族炭化水素及び共役ジエンはほぼ全量が重合体に転化する。
【0016】
本発明において(a)のブロック共重合体の分子量は、モノマーの全添加量に対する開始剤の添加量により制御できる。
(a)のブロック共重合体のビニル芳香族炭化水素のブロック率は、ビニル芳香族炭化水素と共役ジエンを共重合させる際のランダム化剤の添加量により制御できる。ランダム化剤としては主としてテトラヒドロフラン(THF)が用いられるが、その他のエーテル類やアミン類、チオエーテル類、ホスホルアミド、アルキルベンゼンスルホン酸塩、カリウム又はナトリウムのアルコキシド等も使用できる。
【0017】
ランダム化剤の適当なエーテル類としてはTHFの他にジメチルエーテル、ジエチルエーテル、ジフェニルエーテル、ジエチレングリコールジメチルエーテル、ジエチレングリコールジブチルエーテル等が挙げられる。アミン類としては第三級アミン、例えば、トリメチルアミン、トリエチルアミン、テトラメチルエチレンジアミンの他、環状アミン等も使用できる。その他にトリフェニルホスフィン、ヘキサメチルホスホルアミド、アルキルベンゼンスルホン酸カリウム又はナトリウム、カリウム又はナトリウムブトキシド等もランダム化剤として用いることができる。
【0018】
ランダム化剤の添加量としては、全仕込モノマー100質量部に対し、0.001〜10質量部が好ましい。添加時期は重合反応の開始前でも良いし、共重合鎖の重合前でも良い。また必要に応じ追加添加することもできる。
【0019】
その他、機械的にビニル芳香族炭化水素と共役ジエンを重合缶に連続フィードするか、ビニル芳香族炭化水素と共役ジエンを重合缶に交互に少量ずつ分添することによってもブロック率は制御できる。
【0020】
このようにして得られたブロック共重合体は、水、アルコール、二酸化炭素などの重合停止剤を、活性末端を不活性化させるのに充分な量を添加することにより、不活性化される。得られたブロック共重合体溶液より共重合体を回収する方法としては、メタノール等の貧溶媒により析出させる方法、加熱ロール等により溶媒を蒸発させて析出させる方法(ドラムドライヤー法)、濃縮器により溶液を濃縮した後にベント式押出機で溶媒を除去する方法、溶液を水に分散させ、水蒸気を吹き込んで溶媒を加熱除去して共重合体を回収する方法(スチームストリッピング法)等、任意の方法が採用できる。
【0021】
本発明で使用する(b)の重合体は、下記の(i)〜(v)から選ばれた少なくとも一種のビニル芳香族炭化水素系重合体である。
(i)(a)とは異なるビニル芳香族炭化水素と共役ジエンのブロック共重合体
(ii)ビニル芳香族炭化水素重合体
(iii)ビニル芳香族炭化水素と(メタ)アクリル酸からなる共重合体
(iv)ビニル芳香族炭化水素と(メタ)アクリル酸エステルからなる共重合体
(v)ゴム変性スチレン系重合体
(但し、前記(iii)及び(iv)においてビニル芳香族炭化水素とこのビニル芳香族炭化水素と共重合しているコモノマーの質量比は5〜99:95〜1である。)
【0022】
(i)の(a)とは異なるビニル芳香族炭化水素と共役ジエンのブロック共重合体としては、上記に示した(a)のビニル芳香族炭化水素と共役ジエンのブロック共重合体以外の任意のビニル芳香族炭化水素−共役ジエンブロック共重合体が用いられる。
【0023】
(ii)のビニル芳香族炭化水素重合体としては、前記のビニル芳香族炭化水素の単独重合体または2種以上の共重合体が用いられる。特に一般的なものとしてポリスチレンが挙げられる。
【0024】
(iii)のビニル芳香族炭化水素と(メタ)アクリル酸からなる共重合体は、前記のビニル芳香族炭化水素と(メタ)アクリル酸を重合することによって得られるが、重合には各モノマーをそれぞれ1種または2種以上選んで用いることができる。
(メタ)アクリル酸としては、アクリル酸、メタクリル酸が挙げられる。
【0025】
(iv)のビニル芳香族炭化水素と(メタ)アクリル酸エステルからなる共重合体は、前記のビニル芳香族炭化水素と(メタ)アクリル酸エステルを重合することにより得られるが、重合には各モノマーをそれぞれ1種または2種以上選んで用いることができる。
【0026】
(メタ)アクリル酸エステルとしては、アクリル酸メチル、アクリル酸エチル、アクリル酸−n−ブチル、アクリル酸イソブチル、アクリル酸ヘキシル、アクリル酸(2−エチル)ヘキシル、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸ブチル、メタクリル酸(2−ヒドロキシ)エチル等が挙げられる。
【0027】
前記(iii)または(iv)の共重合体は、ビニル芳香族炭化水素と(メタ)アクリル酸またはビニル芳香族炭化水素と(メタ)アクリル酸エステルの質量比が5〜99:95〜1、好ましくは40〜99:60〜1、さらに好ましくは70〜99:30〜1であるモノマー混合物を重合して得られる。
【0028】
(v)のゴム変性スチレン系重合体は、ビニル芳香族炭化水素もしくはこれと共重合可能なモノマーと各種エラストマーとの混合物を重合することによって得られる。ビニル芳香族炭化水素としては、前記(a)のブロック共重合体の製造で説明したものが用いられ、これと共重合可能なモノマーとしては、(メタ)アクリル酸、(メタ)アクリル酸エステル等が用いられる。また、エラストマーとしては、ブタジエンゴム、スチレン−ブタジエンゴム、スチレン−ブタジエンブロック共重合体エラストマー、クロロプレンゴム、天然ゴムなどが用いられる。特に好ましいゴム変性スチレン系重合体としては、耐衝撃性ゴム変性スチレン樹脂(HIPS)、MBS樹脂、MBAS樹脂が挙げられる。
【0029】
なお、MBS樹脂、MBAS樹脂は、まずポリブタジエン又はブタジエンを主成分とするスチレンとの共重合体ゴムラテックスを公知の乳化重合法で製造する。この際に、架橋剤や連鎖移動剤を使用してもよい。次に、MBS樹脂は、このゴムラテックスにスチレン、メチルメタクリレート及び/又はアルキルアクリレートを、MBAS樹脂はスチレン、メチルメタクリレート、アクリロニトリル及び/又はアルキルアクリレートを添加し、グラフト重合を行うことによって得られる。MBS樹脂、MBAS樹脂に使用されるアルキルアクリレートは、前記の(iii)ビニル芳香族炭化水素と(メタ)アクリル酸エステルからなる共重合体で述べたアルキルアクリレートが挙げられる。
【0030】
本発明において、(a)のブロック共重合体と(b)(i)〜(v)の重合体の質量比は組成物全体を100として20〜100:0〜80であり、好ましくは40〜100:0〜60であり、特に好ましくは50〜100:0〜50である。(a)のブロック共重合体が20質量%未満であると熱収縮性フィルムの収縮性が不足する。
【0031】
本発明に使用される(c)ビニル芳香族炭化水素とメタクリル酸の共重合体に用いられるビニル芳香族炭化水素としては、前記のビニル芳香族炭化水素が用いられる。
【0032】
ビニル芳香族炭化水素とメタクリル酸の質量比は、70/30〜99/1であり、好ましくは85/15〜98/2である。ビニル芳香族炭化水素の質量比が70質量%未満ではフィルム製造時の延伸温度が高くなり、またフィルムの熱収縮性が劣るので実用に供せない。99質量%を超えると耐ブロッキング性の改良効果が認められない。
【0033】
本発明において使用される(d)の(i’)は(a)または(b)の(i)と同一でも異なっていてもよい。また(d)の(ii’)、(iv’)、(v’)は(b)の(ii)、(iv)、(v)と同一でも異なっていてもよい。
本発明において、(c)の共重合体と(d)(i’)〜(v’)の重合体の質量比は、組成物全体を100として50〜100:0〜50であり、好ましくは55〜100:0〜45である。(c)の共重合体が50質量%未満では、耐ブロッキング性が不足する。
【0034】
(a)のブロック共重合体、(b)の重合体、(c)の共重合体、(d)の重合体には、必要に応じて種々の添加剤を配合することができる。添加剤としては、各種安定剤、加工助剤、耐光性向上剤、軟化剤、可塑剤、帯電防止剤、防曇剤、鉱油、フィラー、顔料、難燃剤、滑剤等が挙げられる。
【0035】
上記の安定剤としては、2−tert−ブチル−6−(3−tert−ブチル−2−ヒドロキシ−5−メチルベンジル)−4−メチルフェニルアクリレート、2−[1−(2−ヒドロキシ−3,5−ジ−tert−ペンチルフェニル)エチル]−4,6−ジ−tert−ペンチルフェニルアクリレート、2,6−ジ−tert−ブチル−4−メチルフェノール等のフェノール系酸化防止剤、トリスノニルフェニルフォスファイト等の燐系酸化防止剤等が挙げられる。加工助剤、耐光性向上剤、軟化剤、可塑剤、帯電防止剤、防曇剤、鉱油、フィラー、顔料、難燃剤等は、一般的な公知のものが挙げられる。
また、滑剤としては、メチルフェニルポリシロキサン、脂肪酸、脂肪酸グリセリンエステル、脂肪酸アマイド、炭化水素系ワックス等が挙げられる。
【0036】
本発明において、(a)と(b)あるいは(c)と(d)を混合する際、その混合方法は特に規定はないが、例えばヘンシェルミキサー、リボンブレンダー、Vブレンダー等でドライブレンドしてもよく、更に押出機で溶融化してペレット化してもよい。あるいは、各重合体の製造時、重合開始前、重合反応途中、重合体の後処理等の段階で、添加してもよい。
必要に応じて添加剤を配合する場合は、例えば前記(a)と(b)あるいは(c)と(d)にこれら添加剤を更に所定の割合で配合し、前記と同様の混合方法によることができる。
【0037】
本発明の熱収縮性多層フィルムは、表裏層(外層)用、中間層(内層)用に上記の樹脂を各々押出機で溶融し、それをダイ内又はフィードブロック等で多層化後、一軸、二軸あるいは多軸に延伸することによって得ることができる。
熱収縮性多層フィルムで用いられるダイは、Tダイ、環状ダイ等公知のものが使用できる。一軸延伸の例としては、押し出されたシートをテンターで押し出し方向と直交する方向に延伸する方法、押し出されたチューブ状フィルムを円周方向に延伸する方法等が挙げられる。二軸延伸の例としては、押し出されたシートをロールで押し出し方向に延伸した後、テンター等で押し出し方向と直交する方向に延伸する方法、押し出されたチューブ状フィルムを押し出し方向及び円周方向に同時又は別々に延伸する方法等が挙げられる。
なお、多層フィルムにおいては各層としては一層である必要はなく、各々2層以上であっても勿論よい。
また、本発明の(c)及び必要に応じて(d)を含有する共重合体組成物からなる層を外層として少なくとも1層有し、更に(a)及び必要に応じて(b)を含有するブロック共重合体組成物からなる層を少なくとも1層有する2層または3層以上の熱収縮性多層フィルムは、3層以上からなる場合には前者を両外層(表裏層)に、後者を内層(中間層)に配することが好ましい。
また、フィルムの各層の比に制限はないが、(c)及び必要に応じて(d)を含有する共重合体組成物からなる外層はフィルム全体の5%以上であることが好ましい。
更に、本発明の熱収縮性多層フィルムは、他の層としてスチレン−ブタジエンブロック共重合体、ポリスチレン、スチレン−n−ブチルアクリレート共重合体、スチレン−メチルメタクリレート共重合体、耐衝撃性ゴム変性スチレン系樹脂(HIPS)、MBS樹脂、MBAS樹脂等の熱可塑性樹脂の1種以上から選ばれた重合体成分で形成された層を積層して使用することも可能である。
【0038】
本発明において、延伸温度は60〜120℃が好ましい。60℃未満では延伸時にフィルムが破断してしまい、また、120℃を越える場合は良好な収縮特性が得られないため好ましくない。特に好ましいのは、フィルムを構成する内層の組成物のガラス転移温度(Tg)に対して、Tg+5℃〜Tg+20℃の範囲である。
なお、ガラス転移温度(Tg)は損失弾性率のピークの温度から求めたものである。損失弾性率のピークが複数ある場合には、最大値をもつピークの温度をガラス転移温度(Tg)とした。
延伸倍率は、特に制限はないが、1.5〜8倍が好ましい。1.5倍未満では熱収縮性が不足してしまい、また、8倍を越える場合は延伸が難しいため好ましくない。これらのフィルムを熱収縮性ラベルや包装材料として使用する場合、熱収縮率は70℃10秒間で10%以上であることが好ましい。熱収縮率が10%未満では収縮時に高温が必要となるため、被覆される物品に悪影響を与えてしまう怖れがある。好ましい熱収縮率は同温度で30%以上である。また、自然収縮率が40℃7日間で2.5%以下であることが好ましい。また、フィルムの厚さは10〜300μmが好適である。
【0039】
本発明の熱収縮性多層フィルムの用途としては、熱収縮性ラベル、熱収縮性キャップシール等が特に好適であるが、その他、包装フィルム等にも適宜利用することができる。
熱収縮性ラベルは、公知の方法により作製することができ、例えば延伸フィルムを延伸した方向を円周方向にして、溶剤シールすることにより作製することができる。
本発明の熱収縮性多層フィルムが熱収縮性ラベルとして用いられる場合の容器は、特に限定されないがポリエチレンテレフタレート(PETと略称される)製の容器、ガラス製の容器、またはアルミニウム製の容器等が好ましく用いられる。
【0040】
【実施例】
次に実施例をもって本発明を更に説明するが、本発明はこれらの例に限定されるものではない。
【0041】
実施例1〜5及び比較例1〜5
(イ)内層用成分について
成分(a):表1に示すとおりのビニル芳香族炭化水素−共役ジエンブロック共重合体を用いた。
【0042】
【表1】
【0043】
成分(b):表2に示すとおりの重合体を用いた。
【0044】
【表2】
【0045】
(ロ)外層用成分について
成分(c)表3に示す通りのビニル芳香族−メタクリル酸共重合体を用いた。
【0046】
【表3】
【0047】
成分(d):表4に示すとおりの重合体を用いた。
【0048】
【表4】
【0049】
(ハ)フィルムの製造
内層用成分として表1に示した(a)ビニル芳香族炭化水素−共役ジエンブロック共重合体、表2に示した(b)ビニル芳香族炭化水素系重合体、並びに外層用成分として表3に示した(c)ビニル芳香族炭化水素−メタクリル酸共重合体、表4に示した(d)ビニル芳香族炭化水素系重合体を用いて、表5〜表6に示した各層の原料重合体の配合量(質量部)、層比(%)で熱収縮性多層フィルムを作成した。
フィルムは、まず各層に対応する重合体又は重合体組成物を別々の押出機で溶融し、Tダイ内で多層化し、厚さ0.3mmのシートを成形した。その後、テンターを用い表5〜表6に示した延伸温度で5倍に横一軸延伸することによって延伸フィルム作成した。
【0050】
表5〜表6に各層の原料重合体の配合量(質量部)、層比(%)とともに物性を示した。
【0051】
なお、フィルムの各物性は下記の方法によった。
(1)ガラス転移温度(Tg)
重合体組成物のガラス転移温度(Tg)は、損失弾性率を以下の手順に従い動的粘弾性法により測定し、そのピーク値から求めた。
(i)各重合体ペレットを200〜250℃の条件で加熱プレスし、厚さ0.1〜0.5mmのシートを作製した。
(ii)このシートから適当な大きさの試験片を切り出し、23℃、50%RH室内に24時間以上保管した後、下記装置▲1▼を用いて該試験片を構成する重合体に固有な損失弾性率を温度を変化させながら測定した。
装置▲1▼:レオメトリクス社製 固体粘弾性測定装置 RSA2(設定温度範囲:室温〜130℃、設定昇温速度:4℃/分、測定周波数:1Hz)
(2)引張弾性率:JIS K6871に準拠し、エー・アンド・デイ製テンシロン万能試験機(RTC−1210A)を用いて測定した。
(3)熱収縮率:70℃の温水中に10秒間浸漬し、次式より算出した。
熱収縮率(%)={(L1−L2)/L1}×100
但し、L1:浸漬前の長さ(延伸方向)、L2:70℃の温水中に10秒間浸漬した収縮後の長さ(延伸方向)
【0052】
(4)耐ブロッキング性:
35mm×50mmの大きさに切り出したフィルムを4枚用意する。このフィルムを重ね合わせ、その両側からSUSの板をあて、ボルトで締め付ける。90℃の温水に30分浸漬した後重ねたフィルムを取り出す。フィルムを積み重ね方向と直角方向に指で剪断力を掛けてずらし、動かし易さを下記の段階で評価した。
○:容易に動く。 △:動きにくい。 ×:動かない。
【0053】
表5〜表6に示した物性より、本発明の熱収縮性多層フィルムは、剛性、熱収縮性、耐自然収縮性、耐ブロッキング性に優れることがわかる。
【0054】
【表5】
【0055】
【表6】
【0056】
【発明の効果】
本発明の熱収縮性多層フィルムは、剛性、熱収縮性、耐ブロッキング性に優れるので、各種印刷を施したラベルやキャップシール等種々の包装用フィルムとして好適に用いることが出来る。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heat-shrinkable multilayer film having excellent rigidity, heat-shrinkability, and blocking resistance.
[0002]
[Prior art]
Conventionally, heat-shrinkable films used as shrink-wrap packaging and shrink labels for containers have good heat-shrinkability and finish after shrinkage, and they do not have a large environmental load when discarded. -A film formed from a butadiene-based block copolymer is used. However, since this film contains butadiene, it has a high tackiness and has a problem that the films are easily blocked. In order to solve this problem, JP-A-52-130885 discloses a method of adding silica gel and JP-A-1-304146 discloses a method of adding a hydrocarbon wax. Although the printability is improved, there is a disadvantage that the printability is poor. Further, this film has a problem that it is soft and lacks rigidity, and various multilayer films have been proposed to improve these drawbacks (Japanese Patent Application Laid-Open Nos. 9-1114380 and 11-77916). However, these films also have a problem of blocking resistance.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 52-130852 [Patent Document 2]
JP-A-1-304146 [Patent Document 3]
Japanese Patent Application Laid-Open No. 9-114380 [Patent Document 4]
JP-A-11-77916
[Problems to be solved by the invention]
An object of the present invention is to provide a heat-shrinkable multilayer film excellent in rigidity, heat-shrinkability and blocking resistance in view of the above situation.
[0005]
[Means for Solving the Problems]
The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, a composition mainly composed of a copolymer of a specific vinyl aromatic hydrocarbon and methacrylic acid was used as an outer layer to form a specific vinyl aromatic hydrocarbon. By using a composition mainly composed of a copolymer of hydrogen and a conjugated diene as another layer, it has been found that a heat-shrinkable multilayer film having excellent rigidity, heat-shrinkability, and blocking resistance can be obtained. It was completed.
[0006]
That is, the present invention comprises at least one outer layer of a copolymer composition containing the following (c) and, if necessary, (d), comprising at least two layers or three or more layers. A heat-shrinkable multilayer film obtained by stretching a laminate having at least one layer of a block copolymer composition containing (b) as necessary.
(A) A block copolymer of a vinyl aromatic hydrocarbon and a conjugated diene in which the mass ratio of the vinyl aromatic hydrocarbon to the conjugated diene is 50/50 to 90/10 and the block ratio of the vinyl aromatic hydrocarbon is 85% or less. ,
(B) at least one vinyl aromatic hydrocarbon polymer selected from the following (i) to (v):
(I) a block copolymer of a vinyl aromatic hydrocarbon and a conjugated diene different from (a); (ii) a vinyl aromatic hydrocarbon polymer; and (iii) a copolymer comprising a vinyl aromatic hydrocarbon and (meth) acrylic acid. Copolymer (iv) Copolymer of vinyl aromatic hydrocarbon and (meth) acrylate (v) Rubber-modified styrenic polymer (provided that (iii) and (iv) above) The mass ratio of the comonomer copolymerized with the aromatic hydrocarbon is from 5 to 99:95 to 1.)
(C) a copolymer having a mass ratio of vinyl aromatic hydrocarbon to methacrylic acid of 70/30 to 99/1; (d) at least one kind of vinyl aromatic selected from the following (i ′) to (v ′): Group hydrocarbon polymer,
(I ') Block copolymer of vinyl aromatic hydrocarbon and conjugated diene (ii') Vinyl aromatic hydrocarbon polymer (iii ') Copolymer of vinyl aromatic hydrocarbon and acrylic acid (iv') vinyl Copolymer of aromatic hydrocarbon and (meth) acrylate (v ') Rubber-modified styrenic polymer (provided that (iii') and (iv ') are vinyl aromatic hydrocarbon and vinyl aromatic hydrocarbon) (The mass ratio of the comonomer copolymerized with hydrogen is 5 to 99:95 to 1.)
[0007]
Hereinafter, the present invention will be described in detail. Examples of the vinyl aromatic hydrocarbon used in the block copolymer of (a) the vinyl aromatic hydrocarbon and the conjugated diene used in the present invention include styrene, o-methylstyrene, p-methylstyrene, and p-tert-butyl. Styrene, 2,4-dimethylstyrene, 2,5-dimethylstyrene, α-methylstyrene, vinylnaphthalene, vinylanthracene and the like can be mentioned, and styrene is particularly preferable.
[0008]
The conjugated diene used in the production of the block copolymer (a) used in the present invention includes 1,3-butadiene, 2-methyl-1,3-butadiene (isoprene), and 2,3-dimethyl-1. Examples thereof include 1,3-butadiene, 1,3-pentadiene, and 1,3-hexadiene, and particularly preferable examples include 1,3-butadiene and isoprene.
[0009]
The mass ratio between the vinyl aromatic hydrocarbon and the conjugated diene is 50/50 to 90/10, and preferably 55/45 to 85/15. If the mass ratio of the vinyl aromatic hydrocarbon is less than 50% by mass, the rigidity of the film exceeds 90% by mass.
[0010]
The structure of the block copolymer used in the present invention and the structure of each block portion are not particularly limited. Examples of the structure of the block copolymer include a block copolymer of, for example, a linear type or a star type composed of a polymer block mainly composed of a vinyl aromatic hydrocarbon and a polymer block mainly composed of a conjugated diene. Further, when a copolymer portion of a vinyl aromatic hydrocarbon and a conjugated diene is present in a polymer block mainly containing a vinyl aromatic hydrocarbon or a polymer block mainly containing a conjugated diene, the copolymerized vinyl is used. Aromatic hydrocarbons may be distributed uniformly in the polymer block or may be distributed in a tapered (decreasing) form.
[0011]
The block ratio of the vinyl aromatic hydrocarbon in the block copolymer (a) is 85% by mass or less, and particularly preferably 25 to 85%. If the block ratio is less than 25% by mass, the rigidity of the film is reduced, and if it exceeds 85% by mass, the heat shrinkage tends to be reduced.
The block ratio of the vinyl aromatic hydrocarbon was determined by the following equation. That is, the block ratio (% by mass) = (W1 / W0) × 100. Here, W1 represents the mass of the block polymer chain of the vinyl aromatic hydrocarbon in the copolymer, and W0 represents the total mass of the vinyl aromatic hydrocarbon in the block copolymer. Also, W1 in the above formula are known in the literature the block copolymer ozonolysis in "Rubber Chemistry and Technology (Y.TANAKA, et.al., RUBBERCHEMISTRY AND TECHNOLOGY ) " 58, the method described in page 16 (1985) Then, the obtained vinyl aromatic hydrocarbon polymer component was measured by gel permeation chromatography (hereinafter abbreviated as GPC), and the molecular weight corresponding to the chromatogram was determined from a calibration curve prepared using standard polystyrene and styrene oligomer. Those having a number average molecular weight exceeding 3,000 were quantified and determined from the peak area. An ultraviolet spectroscopic detector whose wavelength was set to 254 nm was used as a detector.
[0012]
The number average molecular weight of the block copolymer (a) used in the present invention is preferably from 40,000 to 500,000, particularly preferably from 80,000 to 300,000. If it is less than 40,000, sufficient rigidity and impact resistance of the block copolymer composition cannot be obtained, and if it exceeds 500,000, workability is undesirably reduced. In addition, the number average molecular weight of the block copolymer in the present invention was determined by a conventional method using a gel permeation chromatograph (hereinafter abbreviated as GPC).
[0013]
Next, the production of the block copolymer (a) of the present invention will be described. The block copolymer (a) can be produced by polymerizing monomers of a vinyl aromatic hydrocarbon and a conjugated diene in an organic solvent using an organic lithium compound as an initiator. Examples of the organic solvent include aliphatic hydrocarbons such as butane, pentane, hexane, isopentane, heptane, octane, and isooctane; alicyclic hydrocarbons such as cyclopentane, methylcyclopentane, cyclohexane, methylcyclohexane, and ethylcyclohexane; or ethylbenzene, xylene And the like can be used.
[0014]
The organic lithium compound is a compound in which one or more lithium atoms are bonded in a molecule, and examples thereof include ethyl lithium, n-propyl lithium, isopropyl lithium, n-butyl lithium, sec-butyl lithium, and tert-butyl lithium. Monofunctional organic lithium compounds, polyfunctional organic lithium compounds such as hexamethylene dilithium, butadienyl dilithium, and isoprenyl dilithium can be used.
[0015]
As the vinyl aromatic hydrocarbon and the conjugated diene used in the present invention, those described above can be used, and one or two or more of them can be selected for use in the polymerization. In the living anionic polymerization using the above-mentioned organolithium compound as an initiator, almost all of the vinyl aromatic hydrocarbon and the conjugated diene subjected to the polymerization reaction are converted into a polymer.
[0016]
In the present invention, the molecular weight of the block copolymer (a) can be controlled by the amount of the initiator relative to the total amount of the monomers.
The block ratio of the vinyl aromatic hydrocarbon in the block copolymer (a) can be controlled by the amount of the randomizing agent added when the vinyl aromatic hydrocarbon and the conjugated diene are copolymerized. As the randomizing agent, tetrahydrofuran (THF) is mainly used, but other ethers, amines, thioethers, phosphoramides, alkylbenzene sulfonates, potassium or sodium alkoxides and the like can also be used.
[0017]
Suitable ethers for the randomizing agent include, besides THF, dimethyl ether, diethyl ether, diphenyl ether, diethylene glycol dimethyl ether, diethylene glycol dibutyl ether and the like. As the amines, tertiary amines such as trimethylamine, triethylamine and tetramethylethylenediamine, as well as cyclic amines can be used. In addition, triphenylphosphine, hexamethylphosphoramide, potassium or sodium alkylbenzene sulfonate, potassium or sodium butoxide, and the like can also be used as a randomizing agent.
[0018]
The addition amount of the randomizing agent is preferably 0.001 to 10 parts by mass based on 100 parts by mass of all charged monomers. The addition time may be before the start of the polymerization reaction or before the polymerization of the copolymer chain. Further, they can be added as needed.
[0019]
In addition, the block rate can be controlled by mechanically continuously feeding the vinyl aromatic hydrocarbon and the conjugated diene to the polymerization vessel, or by alternately dispensing the vinyl aromatic hydrocarbon and the conjugated diene little by little into the polymerization vessel.
[0020]
The block copolymer thus obtained is inactivated by adding a polymerization terminator such as water, alcohol or carbon dioxide in an amount sufficient to inactivate the active terminal. As a method of recovering the copolymer from the obtained block copolymer solution, a method of precipitating with a poor solvent such as methanol, a method of evaporating the solvent with a heating roll or the like (a drum dryer method), or a method using a concentrator Any method such as a method of removing the solvent with a vented extruder after concentrating the solution, a method of dispersing the solution in water, blowing steam and removing the solvent by heating to recover the copolymer (steam stripping method), etc. The method can be adopted.
[0021]
The polymer (b) used in the present invention is at least one vinyl aromatic hydrocarbon polymer selected from the following (i) to (v).
(I) a block copolymer of a vinyl aromatic hydrocarbon and a conjugated diene different from (a); (ii) a vinyl aromatic hydrocarbon polymer; and (iii) a copolymer comprising a vinyl aromatic hydrocarbon and (meth) acrylic acid. (Iv) a copolymer comprising a vinyl aromatic hydrocarbon and a (meth) acrylate ester; (v) a rubber-modified styrene-based polymer (provided that the vinyl aromatic hydrocarbon and the vinyl copolymer in (iii) and (iv) above) (The mass ratio of the comonomer copolymerized with the aromatic hydrocarbon is from 5 to 99:95 to 1.)
[0022]
As the block copolymer of a vinyl aromatic hydrocarbon and a conjugated diene different from (a) of (i), any block copolymer other than the block copolymer of a vinyl aromatic hydrocarbon and a conjugated diene of (a) described above may be used. The vinyl aromatic hydrocarbon-conjugated diene block copolymer is used.
[0023]
As the vinyl aromatic hydrocarbon polymer (ii), a homopolymer or a copolymer of two or more of the above-mentioned vinyl aromatic hydrocarbons is used. Particularly common is polystyrene.
[0024]
The copolymer (iii) comprising a vinyl aromatic hydrocarbon and (meth) acrylic acid can be obtained by polymerizing the vinyl aromatic hydrocarbon and (meth) acrylic acid. One type or two or more types can be selected and used.
(Meth) acrylic acid includes acrylic acid and methacrylic acid.
[0025]
The copolymer (iv) consisting of a vinyl aromatic hydrocarbon and a (meth) acrylate is obtained by polymerizing the vinyl aromatic hydrocarbon and the (meth) acrylate. One or two or more monomers can be selected and used.
[0026]
Examples of the (meth) acrylate include methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, hexyl acrylate, (2-ethyl) hexyl acrylate, methyl methacrylate, ethyl methacrylate, and methacryl. Butyl acid, (2-hydroxy) ethyl methacrylate, and the like.
[0027]
The copolymer (iii) or (iv) has a mass ratio of the vinyl aromatic hydrocarbon and the (meth) acrylic acid or the vinyl aromatic hydrocarbon and the (meth) acrylate of 5 to 99:95 to 1, It is preferably obtained by polymerizing a monomer mixture having a ratio of 40 to 99:60 to 1, more preferably 70 to 99:30 to 1.
[0028]
The rubber-modified styrenic polymer (v) can be obtained by polymerizing a mixture of a vinyl aromatic hydrocarbon or a monomer copolymerizable therewith with various elastomers. As the vinyl aromatic hydrocarbon, those described in the above (a) for producing the block copolymer are used, and the monomers copolymerizable therewith include (meth) acrylic acid, (meth) acrylic acid ester and the like. Is used. As the elastomer, butadiene rubber, styrene-butadiene rubber, styrene-butadiene block copolymer elastomer, chloroprene rubber, natural rubber, and the like are used. Particularly preferred rubber-modified styrene-based polymers include impact-resistant rubber-modified styrene resin (HIPS), MBS resin, and MBAS resin.
[0029]
The MBS resin and the MBAS resin are prepared by first preparing polybutadiene or a copolymer rubber latex of styrene containing butadiene as a main component by a known emulsion polymerization method. At this time, a crosslinking agent or a chain transfer agent may be used. Next, the MBS resin is obtained by adding styrene, methyl methacrylate and / or alkyl acrylate to the rubber latex, and the MBAS resin is obtained by adding styrene, methyl methacrylate, acrylonitrile and / or alkyl acrylate, and performing graft polymerization. Examples of the alkyl acrylate used for the MBS resin and the MBAS resin include the alkyl acrylates described in the above (iii) copolymer of vinyl aromatic hydrocarbon and (meth) acrylate.
[0030]
In the present invention, the mass ratio of the block copolymer of (a) to the polymer of (b) (i) to (v) is from 20 to 100: 0 to 80, and preferably from 40 to 100, based on 100 of the whole composition. 100: 0 to 60, particularly preferably 50 to 100: 0 to 50. When the content of the block copolymer (a) is less than 20% by mass, the heat-shrinkable film has insufficient shrinkage.
[0031]
As the vinyl aromatic hydrocarbon used in the copolymer (c) of vinyl aromatic hydrocarbon and methacrylic acid used in the present invention, the above-mentioned vinyl aromatic hydrocarbon is used.
[0032]
The mass ratio of vinyl aromatic hydrocarbon to methacrylic acid is 70/30 to 99/1, preferably 85/15 to 98/2. If the mass ratio of the vinyl aromatic hydrocarbon is less than 70% by mass, the stretching temperature during the production of the film becomes high, and the heat shrinkage of the film is poor, so that it is not practically usable. If it exceeds 99% by mass, the effect of improving blocking resistance is not recognized.
[0033]
(I) of (d) used in the present invention may be the same or different from (i) of (a) or (b). (Ii), (iv ′) and (v ′) in (d) may be the same as or different from (ii), (iv) and (v) in (b).
In the present invention, the mass ratio of the copolymer of (c) to the polymer of (d) (i ′) to (v ′) is 50 to 100: 0 to 50 with respect to the whole composition as 100, and is preferably 55 to 100: 0 to 45. When the copolymer (c) is less than 50% by mass, the blocking resistance is insufficient.
[0034]
Various additives can be added to the block copolymer (a), the polymer (b), the copolymer (c), and the polymer (d) as necessary. Examples of the additives include various stabilizers, processing aids, light resistance improvers, softeners, plasticizers, antistatic agents, antifogging agents, mineral oils, fillers, pigments, flame retardants, lubricants, and the like.
[0035]
Examples of the stabilizer include 2-tert-butyl-6- (3-tert-butyl-2-hydroxy-5-methylbenzyl) -4-methylphenyl acrylate, 2- [1- (2-hydroxy-3, 5-di-tert-pentylphenyl) ethyl] -4,6-di-tert-pentylphenyl acrylate, phenolic antioxidants such as 2,6-di-tert-butyl-4-methylphenol, and trisnonylphenylphospho And phosphorus-based antioxidants such as phyto. As the processing aid, the light resistance improver, the softener, the plasticizer, the antistatic agent, the antifogging agent, the mineral oil, the filler, the pigment, the flame retardant and the like, generally known ones can be mentioned.
Examples of the lubricant include methylphenyl polysiloxane, fatty acid, fatty acid glycerin ester, fatty acid amide, and hydrocarbon wax.
[0036]
In the present invention, when mixing (a) and (b) or (c) and (d), there is no particular limitation on the mixing method, but for example, dry blending with a Henschel mixer, ribbon blender, V blender, or the like. Alternatively, it may be melted and pelletized by an extruder. Alternatively, it may be added during the production of each polymer, before the start of polymerization, during the polymerization reaction, or at the stage of post-treatment of the polymer.
When additives are blended as necessary, for example, these additives are further blended at a predetermined ratio to the above (a) and (b) or (c) and (d), and a mixing method similar to the above is used. Can be.
[0037]
The heat-shrinkable multilayer film of the present invention is obtained by melting each of the above resins for the front and back layers (outer layer) and for the intermediate layer (inner layer) by an extruder, and then laminating the melted resin in a die or a feed block. It can be obtained by stretching biaxially or multiaxially.
As the die used for the heat-shrinkable multilayer film, a known die such as a T die or an annular die can be used. Examples of uniaxial stretching include a method of stretching the extruded sheet with a tenter in a direction perpendicular to the direction of extrusion, and a method of stretching the extruded tubular film in a circumferential direction. As an example of biaxial stretching, after the extruded sheet is stretched in the extrusion direction by a roll, a method of stretching in a direction perpendicular to the extrusion direction by a tenter or the like, the extruded tubular film is extruded in the extrusion direction and in the circumferential direction. Examples of the method include simultaneous and separate stretching.
In the multilayer film, each layer does not need to be a single layer, and may each have two or more layers.
Further, at least one layer comprising a copolymer composition containing (c) of the present invention and, if necessary, (d) is provided as an outer layer, and further contains (a) and, if necessary, (b). When the heat-shrinkable multilayer film having two or three or more layers having at least one layer made of the block copolymer composition to be formed has three or more layers, the former is used as both outer layers (front and back layers) and the latter is used as an inner layer. (Intermediate layer).
Although the ratio of each layer of the film is not limited, the outer layer composed of the copolymer composition containing (c) and, if necessary, (d) is preferably 5% or more of the whole film.
Further, the heat-shrinkable multilayer film of the present invention may further comprise, as other layers, a styrene-butadiene block copolymer, polystyrene, a styrene-n-butyl acrylate copolymer, a styrene-methyl methacrylate copolymer, and an impact-resistant rubber-modified styrene. Layers formed of a polymer component selected from one or more of thermoplastic resins such as a base resin (HIPS), MBS resin, and MBAS resin can also be used.
[0038]
In the present invention, the stretching temperature is preferably from 60 to 120C. If the temperature is lower than 60 ° C., the film will be broken at the time of stretching, and if it exceeds 120 ° C., it is not preferable because good shrinkage characteristics cannot be obtained. Particularly preferred is a range of Tg + 5 ° C. to Tg + 20 ° C. with respect to the glass transition temperature (Tg) of the composition of the inner layer constituting the film.
The glass transition temperature (Tg) is determined from the temperature at the peak of the loss modulus. When there were a plurality of peaks of the loss elastic modulus, the temperature of the peak having the maximum value was defined as the glass transition temperature (Tg).
The stretching ratio is not particularly limited, but is preferably 1.5 to 8 times. If it is less than 1.5 times, the heat shrinkage will be insufficient, and if it is more than 8 times, it is not preferable because stretching is difficult. When these films are used as heat shrinkable labels or packaging materials, the heat shrinkage is preferably 10% or more at 70 ° C. for 10 seconds. If the heat shrinkage is less than 10%, a high temperature is required at the time of shrinkage, which may adversely affect the coated article. The preferred heat shrinkage is 30% or more at the same temperature. The natural shrinkage ratio is preferably 2.5% or less at 40 ° C. for 7 days. The thickness of the film is preferably from 10 to 300 μm.
[0039]
As a use of the heat-shrinkable multilayer film of the present invention, a heat-shrinkable label, a heat-shrinkable cap seal, and the like are particularly suitable, but they can also be appropriately used for a packaging film and the like.
The heat-shrinkable label can be produced by a known method, for example, by producing a stretched film in a circumferential direction with a solvent and sealing with a solvent.
The container when the heat-shrinkable multilayer film of the present invention is used as a heat-shrinkable label is not particularly limited, but a container made of polyethylene terephthalate (abbreviated as PET), a container made of glass, a container made of aluminum, or the like is used. It is preferably used.
[0040]
【Example】
Next, the present invention will be further described with reference to examples, but the present invention is not limited to these examples.
[0041]
Examples 1 to 5 and Comparative Examples 1 to 5
(A) Components for inner layer: Component (a): A vinyl aromatic hydrocarbon-conjugated diene block copolymer as shown in Table 1 was used.
[0042]
[Table 1]
[0043]
Component (b): A polymer as shown in Table 2 was used.
[0044]
[Table 2]
[0045]
(B) Component for outer layer Component (c) A vinyl aromatic-methacrylic acid copolymer as shown in Table 3 was used.
[0046]
[Table 3]
[0047]
Component (d): A polymer as shown in Table 4 was used.
[0048]
[Table 4]
[0049]
(C) Production of Film As components for the inner layer, (a) a vinyl aromatic hydrocarbon-conjugated diene block copolymer shown in Table 1, (b) a vinyl aromatic hydrocarbon polymer shown in Table 2, and an outer layer Using the (c) vinyl aromatic hydrocarbon-methacrylic acid copolymer shown in Table 3 and the (d) vinyl aromatic hydrocarbon-based polymer shown in Table 4 as the components for use, the results are shown in Tables 5 to 6. A heat-shrinkable multilayer film was prepared with the blending amount (parts by mass) of the raw material polymer of each layer and the layer ratio (%).
The film was prepared by first melting a polymer or a polymer composition corresponding to each layer by a separate extruder, forming a multilayer in a T-die, and forming a sheet having a thickness of 0.3 mm. Thereafter, a tenter was used to prepare a stretched film by horizontally and uniaxially stretching 5 times at the stretching temperatures shown in Tables 5 and 6.
[0050]
Tables 5 and 6 show the physical properties together with the blending amount (parts by mass) of the raw material polymer and the layer ratio (%) of each layer.
[0051]
In addition, each physical property of the film was based on the following method.
(1) Glass transition temperature (Tg)
The glass transition temperature (Tg) of the polymer composition was determined from the peak value by measuring the loss elastic modulus by a dynamic viscoelasticity method according to the following procedure.
(I) Each polymer pellet was hot-pressed at 200 to 250 ° C to produce a sheet having a thickness of 0.1 to 0.5 mm.
(Ii) A test piece of an appropriate size is cut out from this sheet and stored in a chamber at 23 ° C. and a relative humidity of 50% for 24 hours or more. The loss modulus was measured while changing the temperature.
Apparatus (1): Rheometrics solid viscoelasticity measuring apparatus RSA2 (set temperature range: room temperature to 130 ° C, set temperature increase rate: 4 ° C / min, measurement frequency: 1 Hz)
(2) Tensile modulus: Measured using a Tensilon universal tester (RTC-1210A) manufactured by A & D in accordance with JIS K6871.
(3) Heat shrinkage: Dipped in 70 ° C. warm water for 10 seconds, and calculated by the following equation.
Heat shrinkage (%) = {(L1-L2) / L1} × 100
However, L1: length before immersion (stretching direction), L2: length after shrinkage immersed in warm water of 70 ° C. for 10 seconds (stretching direction)
[0052]
(4) Blocking resistance:
Four films cut into a size of 35 mm × 50 mm are prepared. The films are overlaid, SUS plates are applied from both sides thereof, and tightened with bolts. After being immersed in warm water of 90 ° C. for 30 minutes, the laminated film is taken out. The films were displaced by applying a shearing force with a finger in the direction perpendicular to the stacking direction, and the ease of movement was evaluated according to the following steps.
:: Moves easily. Δ: hard to move. ×: Does not move.
[0053]
From the physical properties shown in Tables 5 and 6, it is understood that the heat shrinkable multilayer film of the present invention is excellent in rigidity, heat shrinkage, natural shrinkage resistance and blocking resistance.
[0054]
[Table 5]
[0055]
[Table 6]
[0056]
【The invention's effect】
Since the heat-shrinkable multilayer film of the present invention is excellent in rigidity, heat-shrinkability and blocking resistance, it can be suitably used as various packaging films such as various printed labels and cap seals.
Claims (6)
(a)ビニル芳香族炭化水素と共役ジエンの質量比が50/50〜90/10、ビニル芳香族炭化水素のブロック率が85%以下であるビニル芳香族炭化水素と共役ジエンのブロック共重合体、
(b)下記の(i)〜(v)から選ばれた少なくとも一種のビニル芳香族炭化水素系重合体、
(i)(a)とは異なるビニル芳香族炭化水素と共役ジエンのブロック共重合体
(ii)ビニル芳香族炭化水素重合体
(iii)ビニル芳香族炭化水素と(メタ)アクリル酸からなる共重合体
(iv)ビニル芳香族炭化水素と(メタ)アクリル酸エステルからなる共重合体
(v)ゴム変性スチレン系重合体
(但し、前記(iii)及び(iv)においてビニル芳香族炭化水素とビニル芳香族炭化水素と共重合しているコモノマーの質量比は5〜99:95〜1である。)
(c)ビニル芳香族炭化水素とメタクリル酸の質量比が70/30〜99/1である共重合体
(d)下記の(i’)〜(v’)から選ばれた少なくとも一種のビニル芳香族炭化水素系重合体、
(i’)ビニル芳香族炭化水素と共役ジエンのブロック共重合体
(ii’)ビニル芳香族炭化水素重合体
(iii’)ビニル芳香族炭化水素とアクリル酸からなる共重合体
(iv’)ビニル芳香族炭化水素と(メタ)アクリル酸エステルからなる共重合体
(v’)ゴム変性スチレン系重合体
(但し、前記(iii’)及び(iv’)においてビニル芳香族炭化水素とビニル芳香族炭化水素と共重合しているコモノマーの質量比は5〜99:95〜1である。)It is composed of two or more layers and has at least one outer layer of a copolymer composition containing the following (c) and, if necessary, (d), and has the following (a) and, if necessary, A heat-shrinkable multilayer film obtained by stretching a laminate having at least one layer of the block copolymer composition containing (b).
(A) A block copolymer of a vinyl aromatic hydrocarbon and a conjugated diene in which the mass ratio of the vinyl aromatic hydrocarbon to the conjugated diene is 50/50 to 90/10 and the block ratio of the vinyl aromatic hydrocarbon is 85% or less. ,
(B) at least one vinyl aromatic hydrocarbon polymer selected from the following (i) to (v):
(I) a block copolymer of a vinyl aromatic hydrocarbon and a conjugated diene different from (a); (ii) a vinyl aromatic hydrocarbon polymer; and (iii) a copolymer comprising a vinyl aromatic hydrocarbon and (meth) acrylic acid. Copolymer (iv) Copolymer of vinyl aromatic hydrocarbon and (meth) acrylate (v) Rubber-modified styrenic polymer (provided that (iii) and (iv) above) The mass ratio of the comonomer copolymerized with the aromatic hydrocarbon is from 5 to 99:95 to 1.)
(C) a copolymer having a mass ratio of vinyl aromatic hydrocarbon to methacrylic acid of 70/30 to 99/1; (d) at least one kind of vinyl aromatic selected from the following (i ′) to (v ′): Group hydrocarbon polymer,
(I ') Block copolymer of vinyl aromatic hydrocarbon and conjugated diene (ii') Vinyl aromatic hydrocarbon polymer (iii ') Copolymer of vinyl aromatic hydrocarbon and acrylic acid (iv') vinyl Copolymer of aromatic hydrocarbon and (meth) acrylate (v ') Rubber-modified styrenic polymer (provided that (iii') and (iv ') are vinyl aromatic hydrocarbon and vinyl aromatic hydrocarbon) (The mass ratio of the comonomer copolymerized with hydrogen is 5 to 99:95 to 1.)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002288332A JP4067375B2 (en) | 2002-10-01 | 2002-10-01 | Heat shrinkable multilayer film |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002288332A JP4067375B2 (en) | 2002-10-01 | 2002-10-01 | Heat shrinkable multilayer film |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2004122514A true JP2004122514A (en) | 2004-04-22 |
JP4067375B2 JP4067375B2 (en) | 2008-03-26 |
Family
ID=32280856
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2002288332A Expired - Lifetime JP4067375B2 (en) | 2002-10-01 | 2002-10-01 | Heat shrinkable multilayer film |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP4067375B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014240461A (en) * | 2013-06-12 | 2014-12-25 | 電気化学工業株式会社 | Active energy ray crosslinkable resin composition |
JPWO2020026969A1 (en) * | 2018-08-01 | 2021-08-12 | デンカ株式会社 | A block copolymer composition, a heat-shrinkable film made by using the block copolymer composition, and an object to be packaged provided with the heat-shrinkable film. |
-
2002
- 2002-10-01 JP JP2002288332A patent/JP4067375B2/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014240461A (en) * | 2013-06-12 | 2014-12-25 | 電気化学工業株式会社 | Active energy ray crosslinkable resin composition |
JPWO2020026969A1 (en) * | 2018-08-01 | 2021-08-12 | デンカ株式会社 | A block copolymer composition, a heat-shrinkable film made by using the block copolymer composition, and an object to be packaged provided with the heat-shrinkable film. |
JP7382934B2 (en) | 2018-08-01 | 2023-11-17 | デンカ株式会社 | A block copolymer composition, a heat-shrinkable film using the same, and a packaged object equipped with a heat-shrinkable film |
Also Published As
Publication number | Publication date |
---|---|
JP4067375B2 (en) | 2008-03-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6841261B2 (en) | Block copolymer, composition thereof, and film made thereof | |
JPWO2005005527A1 (en) | Heat shrinkable foam film | |
JP3543917B2 (en) | Block copolymer, block copolymer composition and heat-shrinkable film thereof | |
JP5010075B2 (en) | Heat shrinkable film | |
JP4812946B2 (en) | Block copolymer composition, heat shrinkable film and heat shrinkable multilayer film thereof | |
JP5153370B2 (en) | Resin composition, heat-shrinkable film, and heat-shrinkable label | |
JP4097313B2 (en) | Block copolymer composition and heat shrinkable film thereof | |
JP2003094520A (en) | Heat shrinkable film | |
JP4083624B2 (en) | Heat shrinkable film | |
JP3659928B2 (en) | Block copolymer composition and heat shrinkable film thereof | |
JP2002166509A (en) | Heat shrinkable multilayer film | |
JP4067375B2 (en) | Heat shrinkable multilayer film | |
JP4121748B2 (en) | Heat shrinkable film | |
KR101717806B1 (en) | Thermally shrinkable laminated film | |
JP4587528B2 (en) | Block copolymer composition and heat-shrinkable film | |
JP4572058B2 (en) | Block copolymer and heat shrinkable film thereof | |
JP4841060B2 (en) | Block copolymer and composition thereof | |
JP5391062B2 (en) | MD shrink film | |
JP2005213520A (en) | Block copolymer, composition thereof and film comprising the same | |
JP3878648B2 (en) | Process for producing block copolymer | |
JP5328069B2 (en) | Resin composition and heat-shrinkable film | |
JP2003285369A (en) | Heat shrinkable film | |
JP4401052B2 (en) | Polymer composition and heat shrink film thereof | |
JP5051936B2 (en) | Styrenic resin composition | |
JP2003286352A (en) | Heat shrinkable film |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20050209 |
|
A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20070126 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20070130 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20070323 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20070525 |
|
A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20070612 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20070810 |
|
A911 | Transfer to examiner for re-examination before appeal (zenchi) |
Free format text: JAPANESE INTERMEDIATE CODE: A911 Effective date: 20070824 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20070919 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20071109 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20071127 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20071211 |
|
TRDD | Decision of grant or rejection written | ||
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20080107 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20080108 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110118 Year of fee payment: 3 |
|
R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 Ref document number: 4067375 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120118 Year of fee payment: 4 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120118 Year of fee payment: 4 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130118 Year of fee payment: 5 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130118 Year of fee payment: 5 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140118 Year of fee payment: 6 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
EXPY | Cancellation because of completion of term |