JP2004250682A - Heat-shrinkable film - Google Patents
Heat-shrinkable film Download PDFInfo
- Publication number
- JP2004250682A JP2004250682A JP2004011754A JP2004011754A JP2004250682A JP 2004250682 A JP2004250682 A JP 2004250682A JP 2004011754 A JP2004011754 A JP 2004011754A JP 2004011754 A JP2004011754 A JP 2004011754A JP 2004250682 A JP2004250682 A JP 2004250682A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- block
- copolymer
- mass
- shrinkable film
- 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
- 229920006257 Heat-shrinkable film Polymers 0.000 title claims abstract description 67
- -1 polypropylene Polymers 0.000 claims abstract description 77
- 229920001400 block copolymer Polymers 0.000 claims abstract description 50
- 229920000642 polymer Polymers 0.000 claims abstract description 29
- 239000004743 Polypropylene Substances 0.000 claims abstract description 27
- 229920001155 polypropylene Polymers 0.000 claims abstract description 27
- 239000011342 resin composition Substances 0.000 claims abstract description 27
- 238000005984 hydrogenation reaction Methods 0.000 claims abstract description 23
- 230000009477 glass transition Effects 0.000 claims abstract description 17
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 13
- 239000011203 carbon fibre reinforced carbon Substances 0.000 claims abstract description 12
- 229920000359 diblock copolymer Polymers 0.000 claims description 14
- 230000008859 change Effects 0.000 abstract description 13
- 238000012545 processing Methods 0.000 abstract description 12
- 150000001875 compounds Chemical class 0.000 abstract description 10
- 150000001993 dienes Chemical class 0.000 abstract description 6
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 52
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 34
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical class CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 30
- 229920001577 copolymer Polymers 0.000 description 25
- 229920005989 resin Polymers 0.000 description 25
- 239000011347 resin Substances 0.000 description 25
- 238000006116 polymerization reaction Methods 0.000 description 23
- 239000002904 solvent Substances 0.000 description 22
- 238000000034 method Methods 0.000 description 17
- 229920000428 triblock copolymer Polymers 0.000 description 15
- 239000003999 initiator Substances 0.000 description 13
- 239000004793 Polystyrene Substances 0.000 description 12
- 229920002223 polystyrene Polymers 0.000 description 12
- 238000012360 testing method Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 239000000178 monomer Substances 0.000 description 10
- 239000000047 product Substances 0.000 description 10
- 239000002879 Lewis base Substances 0.000 description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 9
- 150000007527 lewis bases Chemical class 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 239000005062 Polybutadiene Substances 0.000 description 8
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 8
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 8
- WGOPGODQLGJZGL-UHFFFAOYSA-N lithium;butane Chemical compound [Li+].CC[CH-]C WGOPGODQLGJZGL-UHFFFAOYSA-N 0.000 description 8
- 229920002857 polybutadiene Polymers 0.000 description 8
- 239000005038 ethylene vinyl acetate Substances 0.000 description 7
- 238000002955 isolation Methods 0.000 description 7
- 229920001195 polyisoprene Polymers 0.000 description 7
- 239000004711 α-olefin Substances 0.000 description 7
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 6
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 6
- 229920000728 polyester Polymers 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 5
- 229920001225 polyester resin Polymers 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 4
- SDJHPPZKZZWAKF-UHFFFAOYSA-N 2,3-dimethylbuta-1,3-diene Chemical compound CC(=C)C(C)=C SDJHPPZKZZWAKF-UHFFFAOYSA-N 0.000 description 4
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 4
- 239000005977 Ethylene Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 238000013329 compounding Methods 0.000 description 4
- 239000007822 coupling agent Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
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- 239000004800 polyvinyl chloride Substances 0.000 description 4
- 229920000915 polyvinyl chloride Polymers 0.000 description 4
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 4
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical group CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 3
- SJRJJKPEHAURKC-UHFFFAOYSA-N N-Methylmorpholine Chemical compound CN1CCOCC1 SJRJJKPEHAURKC-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical group CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000011256 inorganic filler Substances 0.000 description 3
- 229910003475 inorganic filler Inorganic materials 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 239000004645 polyester resin Substances 0.000 description 3
- 230000000379 polymerizing effect Effects 0.000 description 3
- 229920005673 polypropylene based resin Polymers 0.000 description 3
- 229920005604 random copolymer Polymers 0.000 description 3
- 150000003505 terpenes Chemical class 0.000 description 3
- 235000007586 terpenes Nutrition 0.000 description 3
- PMJHHCWVYXUKFD-SNAWJCMRSA-N (E)-1,3-pentadiene Chemical compound C\C=C\C=C PMJHHCWVYXUKFD-SNAWJCMRSA-N 0.000 description 2
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 2
- CRSBERNSMYQZNG-UHFFFAOYSA-N 1-dodecene Chemical compound CCCCCCCCCCC=C CRSBERNSMYQZNG-UHFFFAOYSA-N 0.000 description 2
- GQEZCXVZFLOKMC-UHFFFAOYSA-N 1-hexadecene Chemical compound CCCCCCCCCCCCCCC=C GQEZCXVZFLOKMC-UHFFFAOYSA-N 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
- JRZJOMJEPLMPRA-UHFFFAOYSA-N 1-nonene Chemical compound CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 2
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 2
- HFDVRLIODXPAHB-UHFFFAOYSA-N 1-tetradecene Chemical compound CCCCCCCCCCCCC=C HFDVRLIODXPAHB-UHFFFAOYSA-N 0.000 description 2
- ROGIWVXWXZRRMZ-UHFFFAOYSA-N 2-methylbuta-1,3-diene;styrene Chemical compound CC(=C)C=C.C=CC1=CC=CC=C1 ROGIWVXWXZRRMZ-UHFFFAOYSA-N 0.000 description 2
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 2
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-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
- 229920002292 Nylon 6 Polymers 0.000 description 2
- 229920002302 Nylon 6,6 Polymers 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- 239000004902 Softening Agent Substances 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000010533 azeotropic distillation Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- DIOQZVSQGTUSAI-UHFFFAOYSA-N decane Chemical compound CCCCCCCCCC DIOQZVSQGTUSAI-UHFFFAOYSA-N 0.000 description 2
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000005227 gel permeation chromatography Methods 0.000 description 2
- 229920003049 isoprene rubber Polymers 0.000 description 2
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- 238000002844 melting Methods 0.000 description 2
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- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- UKVIEHSSVKSQBA-UHFFFAOYSA-N methane;palladium Chemical compound C.[Pd] UKVIEHSSVKSQBA-UHFFFAOYSA-N 0.000 description 2
- ZGEGCLOFRBLKSE-UHFFFAOYSA-N methylene hexane Natural products CCCCCC=C ZGEGCLOFRBLKSE-UHFFFAOYSA-N 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 2
- VAMFXQBUQXONLZ-UHFFFAOYSA-N n-alpha-eicosene Natural products CCCCCCCCCCCCCCCCCCC=C VAMFXQBUQXONLZ-UHFFFAOYSA-N 0.000 description 2
- CCCMONHAUSKTEQ-UHFFFAOYSA-N octadec-1-ene Chemical compound CCCCCCCCCCCCCCCCC=C CCCMONHAUSKTEQ-UHFFFAOYSA-N 0.000 description 2
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- SCYULBFZEHDVBN-UHFFFAOYSA-N 1,1-Dichloroethane Chemical compound CC(Cl)Cl SCYULBFZEHDVBN-UHFFFAOYSA-N 0.000 description 1
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- VDNSZPNSUQRUMS-UHFFFAOYSA-N 1-cyclohexyl-4-ethenylbenzene Chemical compound C1=CC(C=C)=CC=C1C1CCCCC1 VDNSZPNSUQRUMS-UHFFFAOYSA-N 0.000 description 1
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- 229940106006 1-eicosene Drugs 0.000 description 1
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- JHTICDZLXFNVKL-UHFFFAOYSA-N 1-ethenyl-4-(4-phenylbutyl)benzene Chemical compound C1=CC(C=C)=CC=C1CCCCC1=CC=CC=C1 JHTICDZLXFNVKL-UHFFFAOYSA-N 0.000 description 1
- VVTGQMLRTKFKAM-UHFFFAOYSA-N 1-ethenyl-4-propylbenzene Chemical compound CCCC1=CC=C(C=C)C=C1 VVTGQMLRTKFKAM-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
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- KXYAVSFOJVUIHT-UHFFFAOYSA-N 2-vinylnaphthalene Chemical compound C1=CC=CC2=CC(C=C)=CC=C21 KXYAVSFOJVUIHT-UHFFFAOYSA-N 0.000 description 1
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- 125000002723 alicyclic group Chemical group 0.000 description 1
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- 239000003963 antioxidant agent Substances 0.000 description 1
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- 239000002981 blocking agent Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
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- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
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- 239000003086 colorant Substances 0.000 description 1
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Landscapes
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
本発明は、熱収縮性フィルムに関する。本発明で得られる熱収縮性フィルムは収縮性に優れ、かつ処理温度（熱）による収縮率の変化（差）が小さいという特性を有すると共に、透明性、印刷性、ヒートシール性、溶剤接着性、延伸性に優れており、熱収縮性フィルムが用いられている包装、ラベルなどの用途に有効に使用することができる。 The present invention relates to a heat-shrinkable film. The heat-shrinkable film obtained by the present invention has excellent shrinkage properties and a small change (difference) in shrinkage rate due to processing temperature (heat), and also has transparency, printability, heat sealability, and solvent adhesion. It is excellent in stretchability, and can be effectively used for applications such as packaging and labels using the heat-shrinkable film.
収縮包装用、ポリエチレンテレフタレートなどのポリエステル系樹脂製ボトルの被覆ラベル用などの用途に用いられる熱収縮性フィルムは、従来、ポリ塩化ビニル、ポリオレフィン、ポリエステルを主成分としている。
ポリ塩化ビニル系熱収縮性フィルムは、力学的強度、光沢、透明性に優れ、比較的低温で目的とする収縮率を達成することができ、かつ処理可能な温度範囲が広く、安価であることから広く使用されていた。しかしながら、ポリ塩化ビニル系熱収縮性フィルムはヒートシール強度が低く、また溶断シールの際に有毒ガス（例えば塩化水素などの塩素系ガス）を発生して包装用の機械を腐食すること、ポリ塩化ビニル樹脂中の可塑剤等の添加剤が経時的にブリードアウトし塵埃の付着等により汚れが生ずると共に、安全性の点でも好ましくないこと、さらに廃棄後、燃焼させると有毒ガスを発生することなどの問題点を有する。
Conventionally, heat-shrinkable films used for shrink-wrapping, labels for coating of polyester resin bottles such as polyethylene terephthalate, etc. mainly contain polyvinyl chloride, polyolefin and polyester as main components.
Polyvinyl chloride-based heat-shrinkable film is excellent in mechanical strength, gloss and transparency, can achieve the desired shrinkage at a relatively low temperature, has a wide processable temperature range, and is inexpensive Widely used from. However, polyvinyl chloride-based heat-shrinkable films have low heat-sealing strength and generate toxic gas (eg, chlorine-based gas such as hydrogen chloride) during fusing and sealing, causing corrosion of packaging machines. Additives such as plasticizers in the vinyl resin bleed out over time, causing dirt due to the adhesion of dust, etc., which is not desirable in terms of safety, and furthermore, toxic gas is generated when burned after disposal. Problem.
この様な環境問題の観点から、近年は、塩素を含まない、ポリエステルまたはポリオレフィンを主成分とした熱収縮性フィルムが使用されている。
ポリエステル系熱収縮性フィルムは、良好な力学的強度を有するが、処理温度による熱収縮率の変化が大きいため、シワ、歪みなどの収縮ムラが発生しやすく、ボトル等の容器に被覆させて収縮する際に、フィルムに印刷した文字や模様が歪んだり、容器に対するフィルムの密着性が十分でなかったりするなどの問題点を有する。このような収縮ムラを改善するべく、例えば特定の構造のジオール成分を有するポリエステルを用いた熱収縮性ポリエステルフィルムが開示されている（特許文献１参照）。
From the viewpoint of such environmental problems, in recent years, heat-shrinkable films containing no chlorine and mainly containing polyester or polyolefin have been used.
Polyester-based heat-shrinkable films have good mechanical strength, but have a large change in heat shrinkage depending on the processing temperature, so they tend to cause shrinkage unevenness such as wrinkles and distortions, and shrink by covering containers such as bottles. In such a case, there are problems that characters and patterns printed on the film are distorted, and that the film has insufficient adhesion to the container. In order to improve such shrinkage unevenness, for example, a heat-shrinkable polyester film using a polyester having a diol component having a specific structure has been disclosed (see Patent Document 1).
また、ポリオレフィン系熱収縮性フィルム、中でもポリプロピレン系熱収縮性フィルムは、比較的透明性や光沢が良好で、他の材料からなる熱収縮性フィルムと比較して耐熱性、力学的強度に優れている。また、ポリエチレンテレフタレートなどのポリエステル系樹脂製ボトル等の容器の被覆ラベル用途としてポリプロピレン系熱収縮性フィルムを使用する場合、廃棄後の粉砕物からポリプロピレン系樹脂を分別する際に、ポリプロピレン系樹脂の比重は１．０未満、一方ポリエステル系樹脂の比重は１．３〜１．５であるので、比重差を利用して高精度の分離が可能となることが開示されている（特許文献２参照）。
なお、ポリオレフィン系フィルム、中でも比較的透明性や光沢が良好なポリプロピレン系フィルムは熱収縮を必要としない包装フィルム用途にも以前から用いられて、その透明性と柔軟性を改良すべく、例えばポリプロピレン系樹脂と水添イソプレン系ブロック共重合体との混合物からなるシート状物成型用組成物が開示されている（特許文献３参照）。
In addition, polyolefin-based heat-shrinkable films, especially polypropylene-based heat-shrinkable films, have relatively good transparency and gloss, and have excellent heat resistance and mechanical strength compared to heat-shrinkable films made of other materials. I have. When a polypropylene-based heat-shrinkable film is used as a label for covering containers such as a bottle of a polyester-based resin such as polyethylene terephthalate, when the polypropylene-based resin is separated from the crushed material after disposal, the specific gravity of the polypropylene-based resin is used. Is less than 1.0, while the specific gravity of the polyester-based resin is 1.3 to 1.5, and it is disclosed that high-precision separation can be performed by utilizing the difference in specific gravity (see Patent Document 2). .
In addition, polyolefin-based films, especially polypropylene-based films having relatively good transparency and gloss, have been used for packaging films that do not require heat shrinkage, and in order to improve their transparency and flexibility, for example, polypropylene Patent Document 3 discloses a composition for molding a sheet, which comprises a mixture of a resin-based resin and a hydrogenated isoprene-based block copolymer.
特許文献１で開示されている熱収縮性ポリエステルフィルムは、特別な構造をもつモノマーを用いる必要があるという問題点を有する。
一方、特許文献２で開示されているポリプロピレン系熱収縮性フィルムは、一般のポリエステル系熱収縮性フィルムと同様に処理温度による収縮率の変化が大きいため、シワ、歪みなどの収縮ムラが発生しやすく、ボトル等の容器に被覆させて収縮する際に、フィルムに印刷した文字や模様が歪んだり、容器に対するフィルムの密着性が十分でなかったりするなどの問題点を有する。
また、ポリプロピレン系樹脂は高融点であるため、ポリプロピレン系熱収縮性フィルムをヒートシールで接合する際に、シール温度領域を比較的高く設定する必要があり、被覆物への熱による悪影響などの問題が生じやすい。同様に、フィルムを延伸する際にも延伸温度を高く設定する必要があり、低温での延伸が困難などの問題点を有する。さらに、ポリ塩化ビニル系熱収縮性フィルムやポリエステル系熱収縮性フィルムは溶剤接着が可能であるが、その際に使用されるテトラヒドロフラン、ｎ−ヘキサン、シクロヘキサン、塩化メチレン、酢酸メチルなどにポリプロピレン系樹脂は溶解しないため、ポリプロピレン系熱収縮性フィルムをこれらの溶剤で接着するのは困難であるなどの問題がある。
そして、ポリプロピレン系熱収縮性フィルムは印刷性が悪く、印刷面に予めコロナ放電処理などの表面処理を施す必要があるなどの問題を有する。
The heat-shrinkable polyester film disclosed in Patent Document 1 has a problem that it is necessary to use a monomer having a special structure.
On the other hand, the heat-shrinkable polypropylene-based film disclosed in Patent Document 2 has a large change in the shrinkage rate due to the processing temperature similarly to a general heat-shrinkable polyester-based film. When it shrinks after being covered with a container such as a bottle, it has problems such as distortion of characters and patterns printed on the film and insufficient adhesion of the film to the container.
In addition, since the polypropylene resin has a high melting point, it is necessary to set a relatively high sealing temperature region when joining a heat-shrinkable polypropylene film by heat sealing, which causes problems such as adverse effects of heat on the coating. Tends to occur. Similarly, when stretching a film, it is necessary to set a high stretching temperature, and there is a problem that stretching at a low temperature is difficult. Further, a polyvinyl chloride-based heat-shrinkable film or a polyester-based heat-shrinkable film can be solvent-bonded, but a polypropylene-based resin such as tetrahydrofuran, n-hexane, cyclohexane, methylene chloride, methyl acetate, etc. is used. However, there is a problem that it is difficult to bond a polypropylene-based heat-shrinkable film with these solvents, because the solvent does not dissolve.
In addition, the polypropylene-based heat-shrinkable film has problems such as poor printability and the necessity of previously performing a surface treatment such as a corona discharge treatment on the printed surface.
しかして、本発明の目的は、収縮性に優れ、温度による熱収縮率変化が小さく、透明性、印刷性、ヒートシール性、溶剤接着性、延伸性に優れる熱収縮性フィルムを提供することにある。 Thus, an object of the present invention is to provide a heat-shrinkable film which is excellent in shrinkage, has a small change in heat shrinkage due to temperature, and is excellent in transparency, printability, heat sealability, solvent adhesion, and stretchability. is there.
本発明によれば、上記の目的は、（ａ）ポリプロピレン系重合体１００質量部に対し、（ｂ）芳香族ビニル化合物を主体とするブロックＡと共役ジエン系化合物を主体とするブロックＢより構成され、ブロックＡの含有量が５〜５５質量％であり、ブロックＢ中に含有される共役ジエン化合物に基づく炭素−炭素二重結合の水素添加率が５０％以上であり、−４０℃〜６０℃の範囲にガラス転移点を有するブロック共重合体５〜２００質量部；を含有する樹脂組成物からなるフィルムを少なくとも１軸方向に延伸してなる熱収縮性フィルム、を提供することにより達成される。 According to the present invention, the above object comprises (a) a block A mainly composed of an aromatic vinyl compound and a block B mainly composed of a conjugated diene compound, based on 100 parts by mass of a polypropylene polymer. The content of the block A is 5 to 55% by mass, the hydrogenation rate of the carbon-carbon double bond based on the conjugated diene compound contained in the block B is 50% or more, and -40 ° C to 60 ° C. A heat-shrinkable film obtained by stretching a film made of a resin composition containing 5-200 parts by mass of a block copolymer having a glass transition point in the range of at least one axis in at least one axis direction. You.
本発明の好適な実施態様は、
・上記ブロック共重合体（ｂ）が、芳香族ビニル化合物を主体とするブロックＡと共役ジエン系化合物を主体とするブロックＢより構成されるＡ−Ｂ型ジブロック共重合体であることを特徴とする上記の熱収縮性フィルム；
・延伸後のヘイズが３％以下であり、８０℃で３分処理した後の延伸方向への収縮率が２０％以上であることを特徴とする上記の熱収縮性フィルム；である。
A preferred embodiment of the present invention is:
-The block copolymer (b) is an AB diblock copolymer composed of a block A mainly composed of an aromatic vinyl compound and a block B mainly composed of a conjugated diene compound. The above heat-shrinkable film;
The heat-shrinkable film described above, wherein the haze after stretching is 3% or less, and the shrinkage in the stretching direction after treatment at 80 ° C. for 3 minutes is 20% or more.
本発明によれば、収縮性に優れ、処理温度による収縮率の変化が小さく、透明性、印刷性、ヒートシール性、溶剤接着性、延伸性に優れる熱収縮性フィルムを得ることができる。 According to the present invention, it is possible to obtain a heat-shrinkable film which is excellent in shrinkage, has a small change in shrinkage due to processing temperature, and is excellent in transparency, printability, heat sealability, solvent adhesion, and stretchability.
本発明の熱収縮性フィルムを構成する樹脂組成物に用いるポリプロピレン系重合体（ａ）としては、プロピレンの単独重合体、プロピレンとエチレンのブロックまたはランダム共重合体、プロピレンとα−オレフィンのブロックまたはランダム共重合体が挙げられる。かかる共重合体におけるα−オレフィンとしては、例えば１−ブテン、１−ペンテン、３−メチル−１−ブテン、１−ヘキセン、３−メチル−１−ペンテン、４−メチル−１−ペンテン、１−ヘプテン、１−オクテン、１−ノネン、１−デセン、１−ドデセン、１−テトラデセン、１−ヘキサデセン、１−オクタデセン、１−エイコセンなどの好ましくは炭素数２０以下のα−オレフィンが挙げられる。ポリプロピレン系重合体（ａ）は、エチレンおよび／または上記したα−オレフィンの１種または２種以上をその構成単位に含んでいてもよい。中でも、プロピレン−エチレン共重合体、プロピレン−１−ブテン共重合体、プロピレン−エチレン−１−ブテン共重合体、プロピレン−１−ヘキセン共重合体などを好ましく用いることができる。 As the polypropylene polymer (a) used in the resin composition constituting the heat shrinkable film of the present invention, a propylene homopolymer, a block or random copolymer of propylene and ethylene, a block of propylene and an α-olefin, or A random copolymer is mentioned. Examples of the α-olefin in such a copolymer include 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 3-methyl-1-pentene, 4-methyl-1-pentene and 1-butene. Α-olefins preferably having 20 or less carbon atoms, such as heptene, 1-octene, 1-nonene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, and 1-eicosene. The polypropylene-based polymer (a) may contain one or more of ethylene and / or the above-mentioned α-olefin in its constituent unit. Among them, propylene-ethylene copolymer, propylene-1-butene copolymer, propylene-ethylene-1-butene copolymer, propylene-1-hexene copolymer and the like can be preferably used.
本発明の熱収縮性フィルムを構成する樹脂組成物に用いるブロック共重合体（ｂ）の、ブロックＡを構成する芳香族ビニル化合物としては、例えばスチレン、α−メチルスチレン、２−メチルスチレン、３−メチルスチレン、４−メチルスチレン、４−プロピルスチレン、４−シクロヘキシルスチレン、４−ドデシルスチレン、２−エチル−４−ベンジルスチレン、４−（フェニルブチル）スチレン、ビニルトルエン、１−ビニルナフタレン、２−ビニルナフタレンなどが挙げられる。これらの中でもスチレン、α−メチルスチレン、４−メチルスチレンが好ましい。ブロックＡは、これらの芳香族ビニル化合物の１種類のみで構成されていてもよいし、２種以上から構成されていてもよい。 Examples of the aromatic vinyl compound constituting the block A of the block copolymer (b) used in the resin composition constituting the heat shrinkable film of the present invention include styrene, α-methylstyrene, 2-methylstyrene, -Methylstyrene, 4-methylstyrene, 4-propylstyrene, 4-cyclohexylstyrene, 4-dodecylstyrene, 2-ethyl-4-benzylstyrene, 4- (phenylbutyl) styrene, vinyltoluene, 1-vinylnaphthalene, 2 -Vinyl naphthalene and the like. Among them, styrene, α-methylstyrene and 4-methylstyrene are preferred. The block A may be composed of only one kind of these aromatic vinyl compounds, or may be composed of two or more kinds.
ブロックＡは、本発明の目的および効果の妨げにならない限り、他の重合性単量体、例えば１，３−ブタジエン、イソプレン、２，３−ジメチル−１，３−ブタジエン、１，３−ペンタジエン、１，３−ヘキサジエンなどの共役ジエン系化合物などを少量（好ましくはブロックＡ全体の質量の２０質量％以下）含んでもよい。 Block A may comprise other polymerizable monomers such as 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, as long as the object and effects of the present invention are not hindered. And a small amount of conjugated diene-based compounds such as 1,3-hexadiene (preferably 20% by mass or less based on the total mass of block A).
ブロック共重合体（ｂ）のブロックＢを構成する共役ジエン系化合物としては、例えば１，３−ブタジエン、イソプレン、２，３−ジメチル−１，３−ブタジエン、１，３−ペンタジエン、１，３−ヘキサジエンなどが挙げられる。ブロックＢは、これらの共役ジエン系化合物の１種類のみで構成されていてもよいし、２種以上の共役ジエン系化合物で構成されていてもよい。これらの中でも１，３−ブタジエン、イソプレンまたは１，３−ブタジエンおよびイソプレンの混合物が好ましい。ブロックＢが２種以上の共役ジエン系化合物（例えば１，３−ブタジエンおよびイソプレン）の混合物で構成されている場合、その混合比や重合形態（ブロック、ランダムなど）に特に制限はない。 Examples of the conjugated diene compound constituting the block B of the block copolymer (b) include 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, and 1,3. -Hexadiene and the like. The block B may be composed of only one of these conjugated diene-based compounds, or may be composed of two or more conjugated diene-based compounds. Among these, 1,3-butadiene, isoprene or a mixture of 1,3-butadiene and isoprene is preferred. When the block B is composed of a mixture of two or more conjugated diene compounds (for example, 1,3-butadiene and isoprene), there is no particular limitation on the mixing ratio and the polymerization form (block, random, etc.).
ブロックＢは、本発明の目的および効果の妨げにならない限り、他の重合性単量体、例えばスチレン、α−メチルスチレン、４−メチルスチレンなどの芳香族ビニル化合物などを少量（好ましくはブロックＢ全体の質量の１０質量％以下）含んでもよい。 The block B contains a small amount of another polymerizable monomer, for example, an aromatic vinyl compound such as styrene, α-methylstyrene, and 4-methylstyrene, as long as the object and effects of the present invention are not hindered. 10% by mass or less of the entire mass).
ブロック共重合体（ｂ）におけるブロックＡの割合は５〜５５質量％の範囲である必要があり、５〜５０質量％の範囲であるのが好ましく、１０〜４０質量％の範囲であるのがより好ましい。ブロック共重合体（ｂ）におけるブロックＡの割合が５５質量％を超える場合には、調製した樹脂組成物から得られる熱収縮性フィルムの処理温度による収縮率の変化が大きくなり、また透明性が不十分となる。一方、５質量％未満の場合は調製した樹脂組成物から得られる熱収縮性フィルムをロールなどに巻き取った際、該フィルム自身が膠着を起こしやすくなる。 The proportion of the block A in the block copolymer (b) must be in the range of 5 to 55% by mass, preferably in the range of 5 to 50% by mass, and more preferably in the range of 10 to 40% by mass. More preferred. When the proportion of the block A in the block copolymer (b) exceeds 55% by mass, the change in shrinkage due to the processing temperature of the heat-shrinkable film obtained from the prepared resin composition increases, and the transparency decreases. Will be insufficient. On the other hand, when the content is less than 5% by mass, when the heat-shrinkable film obtained from the prepared resin composition is wound up on a roll or the like, the film itself easily causes sticking.
ブロック共重合体（ｂ）におけるブロックＢは、そのブロック中に含まれる共役ジエン系化合物に基づく炭素−炭素二重結合の５０％以上が水素添加されている必要があり、７０％以上が水素添加されているのが好ましく、８０％以上が水素添加されているのがより好ましい。ブロック共重合体（ｂ）におけるブロックＢの水素添加率が５０％に満たない場合は、調製した樹脂組成物から得られる熱収縮性フィルムの透明性、延伸性および耐熱性が不十分となる。 In the block B in the block copolymer (b), 50% or more of the carbon-carbon double bonds based on the conjugated diene compound contained in the block must be hydrogenated, and 70% or more of the block B is hydrogenated. And more preferably 80% or more is hydrogenated. When the hydrogenation ratio of the block B in the block copolymer (b) is less than 50%, the transparency, stretchability and heat resistance of the heat-shrinkable film obtained from the prepared resin composition become insufficient.
ブロック共重合体（ｂ）は、−４０〜６０℃の温度範囲にガラス転移点を有する必要があり、−３５〜３５℃の温度範囲であるのが好ましく、−３５〜２５℃の温度範囲であるのがより好ましい。ブロック共重合体（ｂ）のガラス転移点が−４０℃未満であると、調製した樹脂組成物から得られる熱収縮性フィルムの処理温度による収縮率の変化が大きくなり、また透明性が十分に得られず、ヒートシール性、延伸性が劣る。またガラス転移点が６０℃を超える場合は、熱収縮性フィルムの透明性が不十分となる。 The block copolymer (b) needs to have a glass transition point in a temperature range of -40 to 60 ° C, preferably in a temperature range of -35 to 35 ° C, and in a temperature range of -35 to 25 ° C. More preferably, there is. When the glass transition point of the block copolymer (b) is less than −40 ° C., the change in shrinkage due to the processing temperature of the heat-shrinkable film obtained from the prepared resin composition increases, and the transparency is sufficiently high. No heat sealability and stretchability are obtained. When the glass transition point exceeds 60 ° C., the transparency of the heat-shrinkable film becomes insufficient.
ブロック共重合体（ｂ）の重量平均分子量は３００００〜８０００００の範囲であるのが好ましく、５００００〜４０００００の範囲であるのがより好ましく、７００００〜２０００００の範囲であるのがさらに好ましい。ブロック共重合体（ｂ）の重量平均分子量が３００００より小さい場合には、調製した樹脂組成物から得られる熱収縮性フィルムの力学的強度が低下する傾向となり、一方、８０００００を越えるとブロック共重合体（ｂ）の溶融粘度が高くなり、加工性が悪化する傾向となる。
なお、本明細書における重量平均分子量とは、ゲルパーミエーションクロマトグラフィー（ＧＰＣ）測定によって求めたポリスチレン換算の重量平均分子量を意味する。
The weight average molecular weight of the block copolymer (b) is preferably in the range of 30,000 to 800,000, more preferably in the range of 50,000 to 400,000, and still more preferably in the range of 70,000 to 200,000. When the weight average molecular weight of the block copolymer (b) is smaller than 30,000, the mechanical strength of the heat-shrinkable film obtained from the prepared resin composition tends to decrease. The melt viscosity of the united product (b) increases, and the processability tends to deteriorate.
In addition, the weight average molecular weight in this specification means the weight average molecular weight in terms of polystyrene obtained by gel permeation chromatography (GPC) measurement.
また、ブロック共重合体（ｂ）の芳香族ビニル化合物を主体とするブロックＡの重量平均分子量は２５００〜５００００の範囲であるのが好ましく、３０００〜４００００の範囲であるのがより好ましく、３５００〜３５０００の範囲であるのがさらに好ましい。 Further, the weight average molecular weight of the block A mainly composed of an aromatic vinyl compound of the block copolymer (b) is preferably in the range of 2,500 to 50,000, more preferably in the range of 3,000 to 40,000, and more preferably in the range of 3,000 to 50,000. More preferably, it is in the range of 35,000.
ブロック共重合体（ｂ）における芳香族ビニル化合物を主体とするブロックＡと共役ジエン系化合物を主体とするブロックＢの結合様式は、線状、分岐状、放射状、あるいはこれらの任意の組み合わせであってよい。例えばブロックＡをＡで、ブロックＢをＢで表したとき、Ａ−Ｂで表されるジブロック共重合体、Ａ−Ｂ−Ａ、Ｂ−Ａ−Ｂで表されるトリブロック共重合体、Ａ−Ｂ−Ａ−Ｂで表されるテトラブロック共重合体、Ｂ−Ａ−Ｂ−Ａ−Ｂ、Ａ−Ｂ−Ａ−Ｂ−Ａで表されるペンタブロック共重合体、（Ａ−Ｂ）ｎＸ型共重合体（Ｘはカップリング剤残基を表し、ｎは２以上の整数を表す）、およびそれらの混合物などが挙げられる。
これらの中でも、ブロック共重合体（ｂ）として、Ａ−Ｂで表されるジブロック共重合体を用いるのが、処理温度による収縮率の変化が小さく、かつ透明性、ヒートシール性、溶剤接着性、延伸性に優れる熱収縮性フィルムが得られるという観点から特に好ましい。
In the block copolymer (b), the bonding mode of the block A mainly composed of an aromatic vinyl compound and the block B mainly composed of a conjugated diene compound is linear, branched, radial or any combination thereof. May be. For example, when the block A is represented by A and the block B is represented by B, a diblock copolymer represented by AB, ABA, a triblock copolymer represented by BAB, A tetrablock copolymer represented by ABAB, a pentablock copolymer represented by BABAB, ABABA, (AB ) NX-type copolymers (X represents a coupling agent residue, and n represents an integer of 2 or more), and a mixture thereof.
Among these, the diblock copolymer represented by AB is used as the block copolymer (b) because the change in shrinkage due to the processing temperature is small, and the transparency, heat sealability, and solvent adhesion are used. It is particularly preferable from the viewpoint that a heat-shrinkable film having excellent stretchability and stretchability can be obtained.
ブロック共重合体（ｂ）は、例えばアニオン重合法により得られる。具体的には、（イ）アルキルリチウム化合物を開始剤として芳香族ビニル化合物、共役ジエン系化合物を逐次重合させる方法；（ロ）アルキルリチウム化合物を開始剤として芳香族ビニル化合物、共役ジエン系化合物を逐次重合させ、次いでカップリング剤を加えてカップリングする方法；（ハ）ジリチウム化合物を開始剤として共役ジエン系化合物、次いで芳香族ビニル化合物を逐次重合させる方法などが挙げられる。 The block copolymer (b) is obtained, for example, by an anionic polymerization method. Specifically, (a) a method of sequentially polymerizing an aromatic vinyl compound and a conjugated diene compound using an alkyllithium compound as an initiator; and (b) a method of preparing an aromatic vinyl compound and a conjugated diene compound using an alkyllithium compound as an initiator. (C) a method of sequentially polymerizing a conjugated diene-based compound using a dilithium compound as an initiator, and then a method of sequentially polymerizing an aromatic vinyl compound.
アルキルリチウム化合物としては、例えばメチルリチウム、エチルリチウム、ｎ−ブチルリチウム、ｓｅｃ−ブチルリチウム、ｔｅｒｔ−ブチルリチウム、ペンチルリチウムなどが挙げられる。カップリング剤としてはジクロロメタン、ジブロモメタン、ジクロロエタン、ジブロモエタン、ジブロモベンゼンなどが挙げられる。また、ジリチウム化合物としてはナフタレンジリチウム、ジリチオヘキシルベンゼンなどが挙げられる。 Examples of the alkyl lithium compound include methyl lithium, ethyl lithium, n-butyl lithium, sec-butyl lithium, tert-butyl lithium, pentyl lithium, and the like. Examples of the coupling agent include dichloromethane, dibromomethane, dichloroethane, dibromoethane, dibromobenzene, and the like. Examples of the dilithium compound include naphthalenedilithium and dilithiohexylbenzene.
これらのアルキルリチウム化合物、ジリチウム化合物などの開始剤およびカップリング剤の使用量は、求めるブロック共重合体（ｂ）の重量平均分子量により決定されるものであるが、重合に用いる芳香族ビニル化合物および共役ジエン系化合物の合計量の１００質量部あたり、アルキルリチウム化合物、ジリチウム化合物などの開始剤は、通常、０．０１〜０．２質量部の範囲の量で、一方、カップリング剤を使用する場合は、通常、０．００１〜０．８質量部の範囲で用いられる。 The amount of the initiator such as the alkyl lithium compound and the dilithium compound and the amount of the coupling agent to be used is determined by the weight average molecular weight of the block copolymer (b) to be obtained. For 100 parts by mass of the total amount of the conjugated diene-based compound, the initiator such as the alkyl lithium compound and the dilithium compound usually uses a coupling agent in an amount in the range of 0.01 to 0.2 part by mass. In this case, it is usually used in the range of 0.001 to 0.8 parts by mass.
重合は、溶媒の存在下で行うのが好ましい。溶媒としては、開始剤に対して不活性で、反応に悪影響を及ぼさなければ特に制限はなく、例えばヘキサン、ヘプタン、オクタン、デカン、トルエン、ベンゼン、キシレンなどの飽和脂肪族炭化水素または芳香族炭化水素が挙げられる。 The polymerization is preferably performed in the presence of a solvent. The solvent is not particularly limited as long as it is inert to the initiator and does not adversely affect the reaction, and is, for example, a saturated aliphatic hydrocarbon or aromatic hydrocarbon such as hexane, heptane, octane, decane, toluene, benzene, and xylene. Hydrogen.
重合は、上記したいずれの方法による場合も、通常、０〜８０℃の温度範囲で、０．５〜５０時間の範囲で行うことができる。 The polymerization can be carried out usually in a temperature range of 0 to 80 ° C. and in a range of 0.5 to 50 hours by any of the above methods.
なお、−４０℃〜６０℃の温度範囲にガラス転移点を有するブロック共重合体（ｂ）を得るため、重合の際に共触媒としてルイス塩基、例えばジメチルエーテル、ジエチルエーテル、テトラヒドロフランなどのエーテル類；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メチルエーテル等のグリコールエーテル類；トリエチルアミン、Ｎ，Ｎ，Ｎ’，Ｎ’−テトラメチレンジアミン、Ｎ−メチルモルホリンなどのアミン類などを添加して、ブロック共重合体（ｂ）のブロックＢを構成する共役ジエン化合物単位の結合様式、具体的には１，２−結合単位および３，４−結合単位の含有量を３０％以上、好ましくは４５％以上、より好ましくは５５％以上に制御する。 In order to obtain a block copolymer (b) having a glass transition point in the temperature range of -40 ° C to 60 ° C, Lewis bases such as dimethyl ether, diethyl ether, and tetrahydrofuran are used as a co-catalyst at the time of polymerization; Glycol ethers such as ethylene glycol dimethyl ether and diethylene glycol dimethyl ether; amines such as triethylamine, N, N, N ', N'-tetramethylenediamine, N-methylmorpholine and the like are added to form the block copolymer (b). The binding mode of the conjugated diene compound unit constituting the block B, specifically, the content of the 1,2-linkage unit and the 3,4-linkage unit is 30% or more, preferably 45% or more, more preferably 55% or more. To control.
これらのルイス塩基は、１種類を単独で添加しても、２種以上を混合して添加してもよい。ルイス塩基の添加量は、上記した、ブロックＢを構成する共役ジエン化合物単位の結合様式をどの程度制御するかにより決定される量であり、厳密な意味での制限はないが、通常、開始剤として用いるアルキルリチウム化合物またはジリチウム化合物に含有されるリチウム１グラム原子あたり０．１〜１０００モルの範囲であり、１〜１００モルの範囲であるのがより好ましい。 One of these Lewis bases may be added alone, or two or more may be mixed and added. The amount of the Lewis base to be added is an amount determined by how much the bonding mode of the conjugated diene compound unit constituting the block B is controlled, and is not limited in a strict sense. Is in the range of 0.1 to 1000 moles, more preferably 1 to 100 moles, per 1 gram atom of lithium contained in the alkyllithium compound or dilithium compound used.
上記した方法により重合を行なった後、重合反応液に含まれるブロック共重合体を、メタノールなどのこれらのブロック共重合体の貧溶媒に注いで凝固させるか、または重合反応液をスチームと共に熱水中に注いで溶媒を共沸によって除去（スチームストリッピング）した後、乾燥させることにより、ブロック共重合体を単離することができる。 After the polymerization according to the above-described method, the block copolymer contained in the polymerization reaction solution is poured into a poor solvent for these block copolymers such as methanol to coagulate, or the polymerization reaction solution is mixed with steam with hot water. After pouring into the mixture and removing the solvent by azeotropic distillation (steam stripping), the block copolymer can be isolated by drying.
続いて、上記で得られたブロック共重合体を水素添加することでブロック共重合体（ｂ）を得る。水素添加反応は、ラネーニッケル；Ｐｔ、Ｐｄ、Ｒｕ、Ｒｈ、Ｎｉなどの金属をカーボン、アルミナ、珪藻土などの担体に担持させた不均一系触媒；遷移金属化合物とアルキルアルミニウム化合物、アルキルリチウム化合物などとの組み合わせからなるチーグラー系触媒；メタロセン系触媒などの水素添加触媒の存在下、反応および水素添加触媒に対して不活性な溶媒に上記で得られたブロック共重合体を溶解させ、水素と反応させる方法を好ましく行うことができる。なお、上記で得られたブロック共重合体を含む重合反応液からブロック共重合体を単離せず、該重合反応液をそのまま水素添加反応に付すことも可能である。水素添加反応は、通常、水素圧力０．１〜２０ＭＰａ、反応温度２０〜２５０℃、反応時間０．１〜１００時間の範囲で行なうことができる。 Subsequently, the block copolymer obtained above is hydrogenated to obtain a block copolymer (b). The hydrogenation reaction is performed using Raney nickel; a heterogeneous catalyst in which a metal such as Pt, Pd, Ru, Rh, or Ni is supported on a carrier such as carbon, alumina, or diatomaceous earth; a transition metal compound and an alkylaluminum compound or an alkyllithium compound. A Ziegler-based catalyst comprising a combination of: a block copolymer obtained above is dissolved in a solvent inert to the reaction and the hydrogenation catalyst in the presence of a hydrogenation catalyst such as a metallocene catalyst and reacted with hydrogen The method can be carried out preferably. It is also possible to directly subject the polymerization reaction solution to a hydrogenation reaction without isolating the block copolymer from the polymerization reaction solution containing a block copolymer obtained above. The hydrogenation reaction can be usually performed at a hydrogen pressure of 0.1 to 20 MPa, a reaction temperature of 20 to 250 ° C., and a reaction time of 0.1 to 100 hours.
上記した方法による水素添加反応により得られるブロック共重合体（ｂ）は、水素添加反応液を、メタノールなどのブロック共重合体（ｂ）の貧溶媒に注いで凝固させるか、または水素添加反応液をスチームと共に熱水中に注いで溶媒を共沸によって除去（スチームストリッピング）した後、乾燥することにより単離することができる。 The block copolymer (b) obtained by the hydrogenation reaction according to the above-mentioned method is prepared by pouring the hydrogenation reaction solution into a poor solvent for the block copolymer (b) such as methanol to coagulate, or the hydrogenation reaction solution Can be isolated by pouring into a hot water together with steam and removing the solvent by azeotropic distillation (steam stripping), followed by drying.
ブロック共重合体（ｂ）の配合量はポリプロピレン系重合体（ａ）１００質量部に対して５〜２００質量部の範囲であり、１０〜１６０質量部の範囲であるのが好ましく、２０〜１４０質量部の範囲であるのがより好ましい。ブロック共重合体（ｂ）の配合量がポリプロピレン系重合体（ａ）１００質量部に対して５質量部以下では、調製した樹脂組成物から得られる熱収縮性フィルムの処理温度による収縮率の変化が大きくなり、また印刷性、ヒートシール性、溶剤接着性、延伸性が劣る。一方、２００質量部を超えると、調製した樹脂組成物から得られる熱収縮性フィルムの室温での自然収縮が激しく、シワ、歪みなどが発生する。また、処理後の収縮率が低下し、熱収縮性フィルムとして適さないものとなる。 The blending amount of the block copolymer (b) is in the range of 5 to 200 parts by mass, preferably 10 to 160 parts by mass, and more preferably 20 to 140 parts by mass with respect to 100 parts by mass of the polypropylene polymer (a). More preferably, it is in the range of parts by mass. When the blending amount of the block copolymer (b) is 5 parts by mass or less with respect to 100 parts by mass of the polypropylene-based polymer (a), a change in shrinkage due to the processing temperature of the heat-shrinkable film obtained from the prepared resin composition And printability, heat sealability, solvent adhesion, and stretchability are poor. On the other hand, when the amount exceeds 200 parts by mass, the heat-shrinkable film obtained from the prepared resin composition undergoes a natural spontaneous shrinkage at room temperature, causing wrinkles and distortion. In addition, the shrinkage after the treatment is reduced, which makes the film unsuitable as a heat-shrinkable film.
本発明の熱収縮性フィルムを構成する樹脂組成物には、本発明の主旨を損なわない範囲で他のポリマーを含有させてもよい。かかるポリマーとしては、ポリイソプレン、ポリブタジエン、スチレン−ブタジエンゴム、スチレン−イソプレンゴム、ポリエチレン、エチレン−酢酸ビニル共重合体、エチレン−アクリル酸エチル共重合体、エチレン−（メタ）アクリル酸共重合体、エチレン−（メタ）アクリル酸共重合体の金属イオン架橋樹脂（アイオノマー）、ポリスチレン、ＡＳ樹脂、ＡＢＳ樹脂などのスチレン系樹脂、ポリフェニレンエーテル系樹脂、ナイロン６、ナイロン６６などのポリアミド系樹脂、ポリエチレンテレフタレート、ポリブチレンテレフタレートなどのポリエステル系樹脂、ポリウレタン系樹脂、ポリオキシメチレンホモポリマー、ポリオキシメチレンコポリマーなどのアセタール系樹脂、ポリメタクリル酸メチル系樹脂などのアクリル系樹脂などが挙げられる。これらの中でも、エチレン−酢酸ビニル共重合体、エチレン−アクリル酸エチル共重合体が好ましい。 The resin composition constituting the heat-shrinkable film of the present invention may contain another polymer within a range that does not impair the gist of the present invention. Examples of such polymers include polyisoprene, polybutadiene, styrene-butadiene rubber, styrene-isoprene rubber, polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene- (meth) acrylic acid copolymer, Ethylene- (meth) acrylic acid copolymer metal ion crosslinked resin (ionomer), styrene resin such as polystyrene, AS resin, ABS resin, polyphenylene ether resin, polyamide resin such as nylon 6, nylon 66, polyethylene terephthalate Acrylic resin such as polyester resin such as polybutylene terephthalate, polyurethane resin, acetal resin such as polyoxymethylene homopolymer and polyoxymethylene copolymer, and polymethyl methacrylate resin Etc., and the like. Among these, an ethylene-vinyl acetate copolymer and an ethylene-ethyl acrylate copolymer are preferred.
上記エチレン−酢酸ビニル共重合体は、酢酸ビニル単位の含有量が３０質量％以下であるものが好ましい。酢酸ビニル単位の含有量が３０質量％を超えると、調製した樹脂組成物から得られる熱収縮性フィルムの透明性が不十分となる傾向にある。また、係るエチレン−酢酸ビニル共重合体をさらに含有させる場合、その配合量は、樹脂組成物中のポリプロピレン系重合体（ａ）およびブロック共重合体（ｂ）の合計量１００質量部あたり５０質量部以下であることが好ましい。エチレン−酢酸ビニル共重合体の配合量がポリプロピレン系重合体（ａ）およびブロック共重合体（ｂ）の合計量１００質量部あたり５０質量部を越えると、調製した樹脂組成物から得られる熱収縮性フィルムの透明性が不十分となる傾向にある。 The ethylene-vinyl acetate copolymer preferably has a vinyl acetate unit content of 30% by mass or less. When the content of the vinyl acetate unit exceeds 30% by mass, the transparency of the heat-shrinkable film obtained from the prepared resin composition tends to be insufficient. When the ethylene-vinyl acetate copolymer is further contained, the compounding amount thereof is 50 parts by mass per 100 parts by mass of the total amount of the polypropylene-based polymer (a) and the block copolymer (b) in the resin composition. Parts or less. When the amount of the ethylene-vinyl acetate copolymer exceeds 50 parts by mass per 100 parts by mass of the total amount of the polypropylene-based polymer (a) and the block copolymer (b), the heat shrinkage obtained from the prepared resin composition The transparency of the functional film tends to be insufficient.
一方、上記エチレン−アクリル酸エチル共重合体としては、アクリル酸エチル単位の含有量が３０質量％以下であることが好ましい。アクリル酸エチル単位の含有量が３０質量％を超えると、調製した樹脂組成物から得られる熱収縮性フィルムの透明性が不十分となる傾向にある。また、エチレン−アクリル酸エチル共重合体をさらに含有させる場合、その配合量は、樹脂組成物中のポリプロピレン系重合体（ａ）およびブロック共重合体（ｂ）の合計量１００質量部あたり５０質量部以下であることが好ましい。エチレン−アクリル酸エチル共重合体の配合量がポリプロピレン系重合体（ａ）およびブロック共重合体（ｂ）の合計量１００質量部あたり５０質量部を越えると、調製した樹脂組成物から得られる熱収縮性フィルムの透明性が不十分となる傾向にある。 On the other hand, the ethylene-ethyl acrylate copolymer preferably has a content of ethyl acrylate units of 30% by mass or less. When the content of the ethyl acrylate unit exceeds 30% by mass, the transparency of the heat-shrinkable film obtained from the prepared resin composition tends to be insufficient. When the ethylene-ethyl acrylate copolymer is further contained, the amount of the copolymer is 50 parts by mass per 100 parts by mass of the total amount of the polypropylene-based polymer (a) and the block copolymer (b) in the resin composition. Parts or less. When the amount of the ethylene-ethyl acrylate copolymer exceeds 50 parts by mass per 100 parts by mass of the total amount of the polypropylene-based polymer (a) and the block copolymer (b), the heat obtained from the prepared resin composition The transparency of the shrinkable film tends to be insufficient.
本発明の熱収縮性フィルムを構成する樹脂組成物には、本発明の目的および効果に支障をきたさない範囲で、粘着付与樹脂、軟化剤、無機フィラーを添加することができる。 A tackifier resin, a softener, and an inorganic filler can be added to the resin composition constituting the heat-shrinkable film of the present invention as long as the object and effects of the present invention are not hindered.
粘着付与樹脂としては、例えばロジン系樹脂、テルペンフェノール樹脂、テルペン樹脂、芳香族炭化水素変性テルペン樹脂、脂肪族系石油樹脂、脂環式系石油樹脂、芳香族系石油樹脂、クマロン・インデン樹脂、フェノール系樹脂、キシレン樹脂などが挙げられる。粘着付与樹脂を添加する場合、その配合量は、樹脂組成物中のポリプロピレン系重合体（ａ）およびブロック共重合体（ｂ）の合計量１００質量部あたり１００質量部以下であることが好ましい。粘着付与樹脂の配合量がポリプロピレン系重合体（ａ）およびブロック共重合体（ｂ）の合計量１００質量部あたり１００質量部を越えると、調製した樹脂組成物から得られる熱収縮性フィルムの収縮率が不十分となる傾向にある。 Examples of the tackifying resin include a rosin resin, a terpene phenol resin, a terpene resin, an aromatic hydrocarbon-modified terpene resin, an aliphatic petroleum resin, an alicyclic petroleum resin, an aromatic petroleum resin, a cumarone-indene resin, Phenolic resins, xylene resins and the like can be mentioned. When the tackifier resin is added, the compounding amount is preferably 100 parts by mass or less per 100 parts by mass of the total amount of the polypropylene-based polymer (a) and the block copolymer (b) in the resin composition. When the compounding amount of the tackifier resin exceeds 100 parts by mass per 100 parts by mass of the total amount of the polypropylene-based polymer (a) and the block copolymer (b), the shrinkage of the heat-shrinkable film obtained from the prepared resin composition is reduced. The rate tends to be insufficient.
軟化剤としては、例えばパラフィン系、ナフテン系、芳香族系のプロセスオイル；ジオクチルフタレート、ジブチルフタレートなどのフタル酸誘導体；ホワイトオイル、ミネラルオイル、エチレンとα−オレフィンのオリゴマー、パラフィンワックス、流動パラフィン、ポリブテン、低分子量ポリブタジエン、低分子量ポリイソプレンなどが挙げられる。軟化剤を添加する場合、その配合量は、樹脂組成物中のポリプロピレン系重合体（ａ）およびブロック共重合体（ｂ）の合計量１００質量部あたり１００質量部以下であることが好ましい。軟化剤の配合量がポリプロピレン系重合体（ａ）およびブロック共重合体（ｂ）の合計量１００質量部あたり１００質量部を超えると、調製した樹脂組成物から得られる熱収縮性フィルムがべとつく傾向となる。 Examples of the softening agent include paraffinic, naphthenic and aromatic process oils; phthalic acid derivatives such as dioctyl phthalate and dibutyl phthalate; white oil, mineral oil, oligomers of ethylene and α-olefin, paraffin wax, liquid paraffin, Examples include polybutene, low molecular weight polybutadiene, low molecular weight polyisoprene, and the like. When a softening agent is added, the compounding amount is preferably not more than 100 parts by mass per 100 parts by mass of the total amount of the polypropylene-based polymer (a) and the block copolymer (b) in the resin composition. When the blending amount of the softener exceeds 100 parts by mass per 100 parts by mass of the total amount of the polypropylene-based polymer (a) and the block copolymer (b), the heat-shrinkable film obtained from the prepared resin composition tends to be sticky. It becomes.
無機フィラーとしては、例えばタルク、クレー、マイカ、ケイ酸カルシウム、炭酸カルシウム、炭酸マグネシウム、水酸化アルミニウム、水酸化マグネシウム、水酸化カルシウム、シリカ、アルミナ、酸化チタン、酸化鉄、酸化亜鉛、酸化マグネシウムなどが挙げられる。無機フィラーを添加する場合、その配合量は、ポリプロピレン系重合体（ａ）およびブロック共重合体（ｂ）の合計量１００質量部あたり３質量部以下の範囲であるのが好ましく、３質量部を超えると、調製した重合体組成物から得られる熱収縮性フィルムの表面がざらついたり、透明性が低下する傾向となる。 Examples of the inorganic filler include talc, clay, mica, calcium silicate, calcium carbonate, magnesium carbonate, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, silica, alumina, titanium oxide, iron oxide, zinc oxide, and magnesium oxide. Is mentioned. When the inorganic filler is added, the amount thereof is preferably in a range of 3 parts by mass or less per 100 parts by mass of the total amount of the polypropylene-based polymer (a) and the block copolymer (b), preferably 3 parts by mass. If the amount exceeds the above range, the surface of the heat-shrinkable film obtained from the prepared polymer composition tends to be rough, and the transparency tends to decrease.
また、本発明の熱収縮性フィルムを構成する樹脂組成物には、必要に応じて他の添加剤、例えば、熱安定剤、光安定剤、紫外線吸収剤、酸化防止剤、滑剤、着色剤、帯電防止剤、難燃剤、撥水剤、防水剤、親水性付与剤、導電性付与剤、熱伝導性付与剤、電磁波シールド性付与剤、透光性調整剤、蛍光剤、摺動性付与剤、透明性付与剤、アンチブロッキング剤、金属不活性化剤、防菌剤などをさらに添加してもよい。 Further, the resin composition constituting the heat-shrinkable film of the present invention, if necessary, other additives, for example, heat stabilizer, light stabilizer, ultraviolet absorber, antioxidant, lubricant, coloring agent, Antistatic agent, flame retardant, water repellent, waterproofing agent, hydrophilicity imparting agent, conductivity imparting agent, thermal conductivity imparting agent, electromagnetic wave shielding imparting agent, light transmittance adjusting agent, fluorescent agent, slidability imparting agent , A transparency imparting agent, an anti-blocking agent, a metal deactivator, a bactericidal agent and the like may be further added.
本発明の熱収縮性フィルムには、本発明の主旨を損なわない範囲で他のポリマーからなるフィルムを積層してもよい。かかるポリマーとしては、合成ポリイソプレン、ポリブタジエン、スチレン−ブタジエンゴム、スチレン−イソプレンゴム、ポリエチレン、エチレン−α−オレフィン共重合体、エチレン−酢酸ビニル共重合体、エチレン−アクリル酸エチル共重合体、エチレン−（メタ）アクリル酸共重合体、エチレン−（メタ）アクリル酸共重合体の金属イオン架橋樹脂、ポリプロピレン、プロピレン−α−オレフィン共重合体、ナイロン６、ナイロン６６などのポリアミド系樹脂、ポリエチレンテレフタレート、ポリブチレンテレフタレートなどのポリエステル系樹脂、ポリメチルメタアクリレート系樹脂等のアクリル系樹脂などが挙げられる。 A film made of another polymer may be laminated on the heat-shrinkable film of the present invention as long as the gist of the present invention is not impaired. Such polymers include synthetic polyisoprene, polybutadiene, styrene-butadiene rubber, styrene-isoprene rubber, polyethylene, ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene -(Meth) acrylic acid copolymer, metal ion crosslinked resin of ethylene- (meth) acrylic acid copolymer, polypropylene, propylene-α-olefin copolymer, polyamide resin such as nylon 6, nylon 66, etc., polyethylene terephthalate And polyester resins such as polybutylene terephthalate, and acrylic resins such as polymethyl methacrylate resin.
本発明の熱収縮性フィルムの製造方法は特に限定されず、ポリプロピレン系重合体（ａ）、ブロック共重合体（ｂ）および必要に応じて各種の添加剤を溶融混練して樹脂組成物を調製した後、押出機を用いて、Ｔダイ法、チューブラ法などフィルムを製造するに際して一般的に用いられる方法を採用できる。フィルム状に溶融押出された樹脂組成物は、冷却ロール、空気、水などで冷却された後、熱風、温水、赤外線、マイクロウェーブなどの適当な方法で再加熱され、さらに、フィルムを周速差のある２個のロール間で延伸するロール法、テンターを用いてクリップでフィルムを保持してクリップ列の列間隔を拡大させて延伸するテンター法などにより一軸または二軸延伸することで、本発明の熱収縮性フィルムを得ることができる。なお、積層フィルムを製造する場合は、別々の押出機により成形したフィルムをダイ内で積層させて押し出す共押出成型法などが好ましい。 The method for producing the heat-shrinkable film of the present invention is not particularly limited, and the resin composition is prepared by melt-kneading the polypropylene-based polymer (a), the block copolymer (b), and various additives as necessary. After that, a method generally used in producing a film, such as a T-die method and a tubular method, using an extruder can be adopted. The resin composition melt-extruded into a film is cooled by a cooling roll, air, water, or the like, and then reheated by a suitable method such as hot air, hot water, infrared rays, microwave, and the like. The present invention provides uniaxial or biaxial stretching by the roll method of stretching between two rolls having a certain length, the tenter method of stretching the film by holding the film with a clip using a tenter and expanding the line interval between the clip rows, or the like. Can be obtained. In the case of manufacturing a laminated film, a coextrusion molding method in which films formed by separate extruders are laminated and extruded in a die is preferable.
上記した延伸の工程における延伸温度は、４０〜１３０℃の範囲が好ましく、６０〜１１０℃の範囲がより好ましい。延伸温度が４０℃未満の場合は、延伸時にフィルムに破断が生じやすくなる傾向にあり、一方、１３０℃を超える場合には、延伸時にフィルムの弾性率が低下することで、フィルムがロール間やクリップ間で垂れ下がって延伸が不可能となる傾向になる。 The stretching temperature in the above stretching step is preferably in the range of 40 to 130 ° C, more preferably in the range of 60 to 110 ° C. When the stretching temperature is lower than 40 ° C., the film tends to be easily broken at the time of stretching. On the other hand, when the stretching temperature is higher than 130 ° C., the elastic modulus of the film is reduced at the time of stretching. It tends to hang between the clips, making stretching impossible.
上記した延伸の工程における延伸倍率は、延伸手段、延伸温度、目的の製品形態に応じて異なり得るが、通常、２〜８倍の範囲とするのが好ましく、３〜５倍の範囲とするのがより好ましい。延伸倍率が２倍未満の場合は、所定の温度で処理したときのフィルムの収縮率が小さくなる傾向となり、一方、８倍を超えると、延伸時にフィルムに破断が生じやすくなる傾向にあり好ましくない。
なお、本発明の熱収縮性フィルムの厚さは、通常１０〜３００μｍの範囲であるのが好ましく、３０〜１００μｍの範囲であるのがより好ましい。
The stretching ratio in the stretching step described above may vary depending on the stretching means, stretching temperature, and the desired product form, but is usually preferably in the range of 2 to 8 times, and more preferably in the range of 3 to 5 times. Is more preferred. When the stretching ratio is less than 2 times, the shrinkage of the film when treated at a predetermined temperature tends to decrease, while when it exceeds 8 times, the film tends to be easily broken at the time of stretching, which is not preferable. .
The thickness of the heat-shrinkable film of the present invention is usually preferably in the range of 10 to 300 μm, more preferably in the range of 30 to 100 μm.
本発明の範囲となる熱収縮性フィルムの中でも、延伸後のヘイズが３％以下であり、８０℃で３分処理した後に測定した収縮率が２０％以上である熱収縮性フィルムは、本発明の目的を達成する上で特に好適である。 Among the heat-shrinkable films falling within the scope of the present invention, a heat-shrinkable film having a haze after stretching of 3% or less and a shrinkage of 20% or more after treatment at 80 ° C. for 3 minutes is the present invention. It is particularly suitable for achieving the above object.
以下、実施例によって、本発明について具体的に説明するが、本発明は以下の例により何ら限定されるものではない。なお、参考例および実施例中の各種測定値は以下の方法により求めた。 Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to the following Examples. In addition, various measured values in Reference Examples and Examples were obtained by the following methods.
〈１〉ブロック共重合体（ｂ）のガラス転移点
セイコー電子工業社製 示差走差熱量計 ＤＳＣ２００を用い、１０℃／分の昇温速度にて、測定曲線の変曲点の温度を読みとり、ガラス転移点とした。
<1> Glass transition point of block copolymer (b) Using a differential scanning calorimeter DSC200 manufactured by Seiko Denshi Kogyo Co., Ltd., read the temperature at the inflection point of the measurement curve at a heating rate of 10 ° C./min. The glass transition point was taken.
〈２〉ブロック共重合体（ｂ）のスチレン含有量
１Ｈ ＮＭＲスペクトル測定により算出した。
<2> Styrene content of block copolymer (b)
Calculated by 1 H NMR spectrum measurement.
〈３〉ブロック共重合体（ｂ）の水素添加率
水素添加反応前後のブロック共重合体のヨウ素価を測定し、その比より算出した。
<3> Hydrogenation rate of block copolymer (b) The iodine value of the block copolymer before and after the hydrogenation reaction was measured and calculated from the ratio.
〈４〉透明性
後述する実施例および比較例で得られた熱収縮性フィルムを用い、ＡＳＴＭ Ｄ−１００３に準拠して、村上色彩技術研究所製ＨＲ−１００を用いて各々のフィルムのヘイズ（％）を測定し、透明性の指標とした。ヘイズの値が小さいほど透明性に優れる。
<4> Transparency Using the heat-shrinkable films obtained in Examples and Comparative Examples described later, the haze of each film was determined using HR-100 manufactured by Murakami Color Research Laboratory in accordance with ASTM D-1003. %) As an index of transparency. The smaller the haze value, the better the transparency.
〈５〉収縮率
後述する実施例および比較例で得られた熱収縮性フィルムより、フィルムの幅方向を試験片の横方向となるように、縦１００ｍｍ×横２００ｍｍの試験片を作製し、それぞれの試験片を所定温度に設定した恒温槽に入れて３分間処理した。恒温槽の設定温度は８０℃、１００℃および１２０℃の３種とし、それぞれの温度における横方向の収縮率を測定した。収縮率は次式により求めた。
収縮率（％）＝１００×（２００−Ｌ１）／２００
Ｌ１：収縮後の試験片の横の長さ（ｍｍ）
<5> Shrinkage rate From the heat-shrinkable films obtained in Examples and Comparative Examples described later, test pieces of 100 mm long x 200 mm wide were prepared so that the width direction of the film was the horizontal direction of the test pieces. Was placed in a thermostat set at a predetermined temperature and treated for 3 minutes. The set temperature of the thermostat was set to three types of 80 ° C., 100 ° C., and 120 ° C., and the shrinkage in the horizontal direction at each temperature was measured. The shrinkage was determined by the following equation.
Shrinkage (%) = 100 × (200−L 1 ) / 200
L 1 : lateral length (mm) of test piece after shrinkage
〈６〉印刷性
後述する実施例および比較例で得られた熱収縮性フィルムに、インダストリアルサプライヤーズ社製 印刷インキ（商品名、ＫＩインキ９７１４）を１００μｍの厚みに塗布して、３時間風乾した後、インキの塗布面にセロテープ（登録商標、ニチバン（株）製）を貼付し、１８０度の角度で剥離速度１０ｍｍ／ｓｅｃで剥がし、インキの剥離状態を下記基準により評価した。
○：ほとんど剥離しない。
△：部分的に剥離する。
×：容易に剥離する。
<6> Printability To a heat-shrinkable film obtained in Examples and Comparative Examples described below, a printing ink (trade name, KI ink 9714) manufactured by Industrial Suppliers was applied to a thickness of 100 μm, and air-dried for 3 hours. Thereafter, a cellotape (registered trademark, manufactured by Nichiban Co., Ltd.) was adhered to the surface to which the ink was applied, and peeled off at an angle of 180 ° at a peeling speed of 10 mm / sec, and the peeling state of the ink was evaluated according to the following criteria.
：: Almost no peeling.
Δ: Partially peeled off.
×: easily peeled.
〈７〉ヒートシール性
後述する実施例および比較例で得られた熱収縮性フィルムより、フィルムの幅方向を試験片の横方向となるように、縦１００ｍｍ×横２００ｍｍの試験片を作製し、この試験片２枚を４隅が重なるように合わせて、志賀包装機製ヒートシーラーＳＧにより３ｋｇ荷重、１２０℃、１秒の条件にて、フィルムの縦方向に帯状３ｃｍ幅で融着させた後、試験片２枚をそれらの横方向に１８０度の角度で開き、３ｋｇの荷重をかけて剥離させ、下記基準で評価した。
○：広げても剥離しない。
△：広げても容易に剥がせない。
×：広げると容易に剥離する。
<7> Heat sealability From the heat-shrinkable films obtained in Examples and Comparative Examples described later, a test piece having a length of 100 mm and a width of 200 mm was prepared so that the width direction of the film was the horizontal direction of the test piece. The two test pieces were aligned so that the four corners were overlapped, and were fused with a heat sealer SG manufactured by Shiga Packing Machine Co., Ltd. at a load of 3 kg and a temperature of 120 ° C. for 1 second. Two test pieces were opened at an angle of 180 degrees in the lateral direction, and peeled under a load of 3 kg, and evaluated according to the following criteria.
：: Does not peel even when spread.
Δ: Cannot be easily peeled off even when spread.
×: easily peeled when spread.
〈８〉溶剤接着性
後述する実施例および比較例で得られた熱収縮性フィルムより、フィルムの幅方向を試験片の横方向となるように、縦５０ｍｍ×横２５ｍｍの試験片を２枚作製し、これら試験片の一方の片面における一部分（縦４０ｍｍ×横２５ｍｍ）にテトラヒドロフラン０．１ｍｌを均一に塗布して、もう一方の試験片を４隅が重なるように合わせて、３ｋｇ荷重、２５℃、５時間の条件にて、溶剤接着させた後、試験片２枚をそれらの横方向に１８０度の角度で開き、３ｋｇの荷重をかけて剥離させ、下記基準で評価した。
◎：広げても全く剥離しない。
○：広げても完全には剥離せず、接着している部分が残る。
△：広げるとゆっくりと完全に剥離する。
×：広げるとすぐに剥離する。
<8> Solvent Adhesion Two pieces of 50 mm × 25 mm test pieces were prepared from the heat-shrinkable films obtained in Examples and Comparative Examples described below so that the width direction of the film was the horizontal direction of the test pieces. Then, 0.1 ml of tetrahydrofuran was uniformly applied to a part (40 mm × 25 mm) on one side of one of these test pieces, and the other test piece was adjusted so that the four corners overlap, and a 3 kg load was applied at 25 ° C. After the solvent bonding under the condition of 5 hours, two test pieces were opened at an angle of 180 degrees in the lateral direction thereof, peeled off under a load of 3 kg, and evaluated according to the following criteria.
：: Does not peel at all even when spread.
：: Even if it is spread, it is not completely peeled off, and a bonded portion remains.
Δ: Peeled slowly and completely when spread.
×: Peeled immediately after spreading.
〈９〉延伸性
後述する実施例および比較例において、５０℃にてフィルムを延伸した際のフィルムの外観を下記基準により評価し、延伸性の指標とした。
○：フィルム厚が一定で延伸ムラがない。
△：延伸時にフィルムの破断はしないが延伸ムラが生じる。
×：延伸時にフィルムの破断が生じる。
<9> Stretchability In the examples and comparative examples described below, the appearance of the film when the film was stretched at 50 ° C. was evaluated according to the following criteria and used as an index of stretchability.
：: The film thickness is constant and there is no stretching unevenness.
Δ: The film is not broken at the time of stretching, but stretching unevenness occurs.
X: The film breaks during stretching.
参考例１
窒素置換し、乾燥させた耐圧容器に、溶媒としてシクロヘキサン６０Ｌ、開始剤としてｓｅｃ−ブチルリチウム０．１３Ｌ、ルイス塩基としてテトラヒドロフラン０．４Ｌを仕込み、５０℃に昇温した後、スチレン４．３Ｌを加えて３時間重合させ、引き続いてイソプレン６．７Ｌおよびブタジエン７．３Ｌの混合物を加えて４時間重合を行い、合計で７時間重合させた。得られた重合反応液をメタノール８０Ｌ中に注ぎ、析出した固体を濾別して５０℃で２０時間乾燥することによりポリスチレン−ポリ（イソプレン／ブタジエン）ジブロック共重合体１３ｋｇを得た。
続いて、得られたポリスチレン−ポリ（イソプレン／ブタジエン）ジブロック共重合体１３ｋｇをシクロヘキサン１００Ｌに溶解し、水素添加触媒としてパラジウムカーボン（パラジウム担持量：５質量％）を該共重合体に対して５質量％添加し、水素圧力２ＭＰａ、１５０℃の条件で１０時間反応を行った。放冷、放圧後、濾過によりパラジウムカーボンを除去し、濾液を濃縮し、さらに真空乾燥することにより、ポリスチレン−ポリ（イソプレン／ブタジエン）ジブロック共重合体の水素添加物（以下、これを共重合体（１）と略称する）を得た。
得られた共重合体（１）のガラス転移点は−２０℃、スチレン含有量は３０質量％、ポリ（イソプレン／ブタジエン）ブロックの含有する炭素−炭素二重結合の水素添加率は９０％、重量平均分子量は１３００００であった。
Reference Example 1
A nitrogen-substituted and dried pressure vessel was charged with 60 L of cyclohexane as a solvent, 0.13 L of sec-butyllithium as an initiator, and 0.4 L of tetrahydrofuran as a Lewis base. After the temperature was raised to 50 ° C., 4.3 L of styrene was added. In addition, polymerization was carried out for 3 hours, and subsequently, a mixture of 6.7 L of isoprene and 7.3 L of butadiene was added, and polymerization was carried out for 4 hours, and polymerization was carried out for 7 hours in total. The obtained polymerization reaction solution was poured into 80 L of methanol, and the precipitated solid was separated by filtration and dried at 50 ° C. for 20 hours to obtain 13 kg of a polystyrene-poly (isoprene / butadiene) diblock copolymer.
Subsequently, 13 kg of the obtained polystyrene-poly (isoprene / butadiene) diblock copolymer was dissolved in 100 L of cyclohexane, and palladium carbon (palladium loading: 5% by mass) was added to the copolymer as a hydrogenation catalyst. 5% by mass was added, and a reaction was performed for 10 hours under the conditions of a hydrogen pressure of 2 MPa and 150 ° C. After allowing to cool and release the pressure, the palladium carbon was removed by filtration, the filtrate was concentrated, and further dried in vacuo to obtain a hydrogenated product of a polystyrene-poly (isoprene / butadiene) diblock copolymer. Polymer (1)) was obtained.
The glass transition point of the obtained copolymer (1) is −20 ° C., the styrene content is 30% by mass, the hydrogenation rate of the carbon-carbon double bond contained in the poly (isoprene / butadiene) block is 90%, The weight average molecular weight was 130,000.
参考例２
参考例１において、重合させるモノマーとしてスチレン２．２Ｌ、イソプレン６．７Ｌおよびブタジエン７．３Ｌの混合物、ならびにスチレン２．１Ｌを逐次添加して重合させた以外は参考例１と同様の方法で重合反応および単離操作を行い、ポリスチレン−ポリ（イソプレン／ブタジエン）−ポリスチレントリブロック共重合体を得た。さらに、得られた該トリブロック共重合体を参考例１と同様の方法で水素添加することによりポリスチレン−ポリ（イソプレン／ブタジエン）−ポリスチレントリブロック共重合体の水素添加物（以下、これを共重合体（２）と略称する）を得た。
得られた共重合体（２）のガラス転移点は−２０℃、スチレン含有量は３０質量％、ポリ（イソプレン／ブタジエン）ブロックの含有する炭素−炭素二重結合の水素添加率は９０％、重量平均分子量は１３００００であった。
Reference Example 2
Polymerization was performed in the same manner as in Reference Example 1, except that 2.2 L of styrene, 6.7 L of isoprene, and 7.3 L of butadiene were used as the monomers to be polymerized, and 2.1 L of styrene were sequentially added. The reaction and isolation operations were performed to obtain a polystyrene-poly (isoprene / butadiene) -polystyrene triblock copolymer. Further, the obtained triblock copolymer was hydrogenated in the same manner as in Reference Example 1 to obtain a hydrogenated product of a polystyrene-poly (isoprene / butadiene) -polystyrene triblock copolymer (hereinafter referred to as a copolymer). Polymer (2)) was obtained.
The glass transition point of the obtained copolymer (2) is −20 ° C., the styrene content is 30% by mass, the hydrogenation rate of the carbon-carbon double bond contained in the poly (isoprene / butadiene) block is 90%, The weight average molecular weight was 130,000.
参考例３
参考例１において、開始剤としてｓｅｃ−ブチルリチウム０．１５Ｌ、重合させるモノマーとしてスチレン１．４Ｌ、イソプレン１５．３Ｌおよびスチレン１．４Ｌを逐次添加して重合させた以外は参考例１と同様の方法で重合反応および単離操作を行い、ポリスチレン−ポリイソプレン−ポリスチレントリブロック共重合体を得た。さらに、得られた該トリブロック共重合体を参考例１と同様の方法で水素添加することによりポリスチレン−ポリイソプレン−ポリスチレントリブロック共重合体の水素添加物（以下、これを共重合体（３）と略称する）を得た。
得られた共重合体（３）のガラス転移点は−１０℃、スチレン含有量は２０質量％、ポリイソプレンブロックの含有する炭素−炭素二重結合の水素添加率は８０％、重量平均分子量は１１５０００であった。
Reference Example 3
In Reference Example 1, the same as Reference Example 1 except that 0.15 L of sec-butyllithium was used as an initiator, and 1.4 L of styrene, 15.3 L of isoprene, and 1.4 L of styrene were sequentially added as monomers to be polymerized. A polymerization reaction and an isolation operation were performed by the method to obtain a polystyrene-polyisoprene-polystyrene triblock copolymer. Further, the obtained triblock copolymer was hydrogenated in the same manner as in Reference Example 1 to obtain a hydrogenated product of a polystyrene-polyisoprene-polystyrene triblock copolymer (hereinafter referred to as copolymer (3) )).
The glass transition point of the obtained copolymer (3) is -10 ° C, the styrene content is 20% by mass, the hydrogenation rate of the carbon-carbon double bond contained in the polyisoprene block is 80%, and the weight average molecular weight is It was 115,000.
参考例４
参考例１において、開始剤としてｓｅｃ−ブチルリチウム０．１２Ｌ、ルイス塩基としてＮ，Ｎ，Ｎ’，Ｎ’−テトラメチレンジアミン０．１Ｌ、重合させるモノマーとしてスチレン０．７Ｌ、イソプレン１７．２Ｌおよびスチレン０．７Ｌを逐次添加して重合させた以外は参考例１と同様の方法で重合反応および単離操作を行い、ポリスチレン−ポリイソプレン−ポリスチレントリブロック共重合体を得た。さらに、得られた該トリブロック共重合体を参考例１と同様の方法で水素添加することによりポリスチレン−ポリイソプレン−ポリスチレントリブロック共重合体の水素添加物（以下、これを共重合体（４）と略称する）を得た。
得られた共重合体（４）のガラス転移点は１０℃、スチレン含有量は１０質量％、ポリイソプレンブロックの含有する炭素−炭素二重結合の水素添加率は６０％、重量平均分子量は１４００００であった。
Reference example 4
In Reference Example 1, 0.12 L of sec-butyllithium as an initiator, 0.1 L of N, N, N ', N'-tetramethylenediamine as a Lewis base, 0.7 L of styrene as a monomer to be polymerized, 17.2 L of isoprene and A polymerization reaction and an isolation operation were carried out in the same manner as in Reference Example 1 except that 0.7 L of styrene was added successively to carry out polymerization to obtain a polystyrene-polyisoprene-polystyrene triblock copolymer. Further, the obtained triblock copolymer was hydrogenated in the same manner as in Reference Example 1 to obtain a hydrogenated product of a polystyrene-polyisoprene-polystyrene triblock copolymer (hereinafter referred to as copolymer (4) )).
The glass transition point of the obtained copolymer (4) is 10 ° C., the styrene content is 10% by mass, the hydrogenation rate of the carbon-carbon double bond contained in the polyisoprene block is 60%, and the weight average molecular weight is 140000. Met.
参考例５
参考例１において、開始剤としてｓｅｃ−ブチルリチウム０．１４Ｌ、ルイス塩基としてＮ，Ｎ，Ｎ’，Ｎ’−テトラメチレンジアミン０．３Ｌ、重合させるモノマーとしてスチレン４．３Ｌおよびブタジエン１４．７Ｌを逐次添加して重合させた以外は参考例１と同様の方法で重合反応および単離操作を行い、ポリスチレン−ポリブタジエンジブロック共重合体を得た。さらに、得られた該ジブロック共重合体を参考例１と同様の方法で水素添加することによりポリスチレン−ポリブタジエンジブロック共重合体の水素添加物（以下、これを共重合体（５）と略称する）を得た。
得られた共重合体（５）のガラス転移点は−３２℃、スチレン含有量は３０質量％、ポリブタジエンブロックの含有する炭素−炭素二重結合の水素添加率は８０％、重量平均分子量は１２００００であった。
Reference example 5
In Reference Example 1, 0.14 L of sec-butyllithium as an initiator, 0.3 L of N, N, N ', N'-tetramethylenediamine as a Lewis base, 4.3 L of styrene and 14.7 L of butadiene as monomers to be polymerized were used. A polymerization reaction and an isolation operation were carried out in the same manner as in Reference Example 1 except that the polymerization was carried out by successive addition to obtain a polystyrene-polybutadiene diblock copolymer. Further, the obtained diblock copolymer was hydrogenated in the same manner as in Reference Example 1 to obtain a hydrogenated product of a polystyrene-polybutadiene diblock copolymer (hereinafter, abbreviated as copolymer (5)). To do).
The glass transition point of the obtained copolymer (5) is -32 ° C, the styrene content is 30% by mass, the hydrogenation rate of the carbon-carbon double bond contained in the polybutadiene block is 80%, and the weight average molecular weight is 120,000. Met.
参考例６
参考例１において、開始剤としてｓｅｃ−ブチルリチウム０．１９Ｌ、ルイス塩基としてＮ，Ｎ，Ｎ’，Ｎ’−テトラメチレンジアミン０．３Ｌ、重合させるモノマーとしてスチレン３．６Ｌ、ブタジエン１０．５Ｌおよびスチレン３．６Ｌを逐次添加して重合させた以外は参考例１と同様の方法で重合反応および単離操作を行い、ポリスチレン−ポリブタジエン−ポリスチレントリブロック共重合体を得た。さらに、得られた該トリブロック共重合体を参考例１と同様の方法で水素添加することによりポリスチレン−ポリブタジエン−ポリスチレントリブロック共重合体の水素添加物（以下、これを共重合体（６）と略称する）を得た。
得られた共重合体（６）のガラス転移点は−３４℃、スチレン含有量は５０質量％、ポリブタジエンブロックの含有する炭素−炭素二重結合の水素添加率は８０％、重量平均分子量は９００００であった。
Reference Example 6
In Reference Example 1, 0.19 L of sec-butyllithium as an initiator, 0.3 L of N, N, N ′, N′-tetramethylenediamine as a Lewis base, 3.6 L of styrene as a monomer to be polymerized, 10.5 L of butadiene and A polymerization reaction and an isolation operation were carried out in the same manner as in Reference Example 1 except that 3.6 L of styrene was successively added to carry out polymerization to obtain a polystyrene-polybutadiene-polystyrene triblock copolymer. Further, the obtained triblock copolymer was hydrogenated in the same manner as in Reference Example 1 to obtain a hydrogenated product of a polystyrene-polybutadiene-polystyrene triblock copolymer (hereinafter referred to as copolymer (6)). ).
The glass transition point of the obtained copolymer (6) is -34 ° C, the styrene content is 50% by mass, the hydrogenation rate of the carbon-carbon double bond contained in the polybutadiene block is 80%, and the weight average molecular weight is 90000. Met.
参考例７
参考例１において、ルイス塩基は添加せず、開始剤としてｓｅｃ−ブチルリチウム０．１２Ｌ、重合させるモノマーとしてスチレン２．２Ｌおよびイソプレン１３．４Ｌを逐次添加して重合させた以外は参考例１と同様の方法で重合反応および単離操作を行い、ポリスチレン−ポリイソプレンジブロック共重合体を得た。さらに、得られた該ジブロック共重合体を参考例１と同様の方法で水素添加することによりポリスチレン−ポリイソプレンジブロック共重合体の水素添加物（以下、これを共重合体（７）と略称する）を得た。
得られた共重合体（７）のガラス転移点は−６３℃、スチレン含有量は３０質量％、ポリイソプレンブロックの含有する炭素−炭素二重結合の水素添加率は９０％、重量平均分子量は１４００００であった。
Reference Example 7
Reference Example 1 was the same as Reference Example 1 except that Lewis base was not added, and sec-butyllithium 0.12 L as an initiator, styrene 2.2 L and isoprene 13.4 L as monomers to be polymerized were successively added and polymerized. The polymerization reaction and isolation operation were performed in the same manner to obtain a polystyrene-polyisoprene diblock copolymer. Further, the obtained diblock copolymer was hydrogenated in the same manner as in Reference Example 1 to obtain a hydrogenated product of a polystyrene-polyisoprene diblock copolymer (hereinafter referred to as a copolymer (7)). Abbreviated).
The glass transition point of the obtained copolymer (7) is -63 ° C, the styrene content is 30% by mass, the hydrogenation rate of the carbon-carbon double bond contained in the polyisoprene block is 90%, and the weight average molecular weight is It was 140000.
参考例８
参考例１において、ルイス塩基は添加せず、開始剤としてｓｅｃ−ブチルリチウム０．２１Ｌ、重合させるモノマーとしてスチレン５．０Ｌ、ブタジエン６．３Ｌおよびスチレン５．０Ｌを逐次添加して重合させた以外は参考例１と同様の方法で重合反応および単離操作を行い、ポリスチレン−ポリブタジエン−ポリスチレントリブロック共重合体を得た。さらに、得られた該ジブロック共重合体を参考例１と同様の方法で水素添加することによりポリスチレン−ポリブタジエン−ポリスチレントリブロック共重合体の水素添加物（以下、これを共重合体（８）と略称する）を得た。
得られた共重合体（８）のガラス転移点は−５７℃、スチレン含有量は７０質量％、ポリブタジエンブロックの含有する炭素−炭素二重結合の水素添加率は９５％、重量平均分子量は８００００であった。
Reference Example 8
In Reference Example 1, except that the Lewis base was not added, and sec-butyl lithium 0.21 L as an initiator, styrene 5.0 L, butadiene 6.3 L, and styrene 5.0 L as monomers to be polymerized were sequentially added and polymerized. Performed a polymerization reaction and an isolation operation in the same manner as in Reference Example 1 to obtain a polystyrene-polybutadiene-polystyrene triblock copolymer. Further, the obtained diblock copolymer was hydrogenated in the same manner as in Reference Example 1 to obtain a hydrogenated product of a polystyrene-polybutadiene-polystyrene triblock copolymer (hereinafter referred to as copolymer (8)). ).
The glass transition point of the obtained copolymer (8) is -57 ° C, the styrene content is 70% by mass, the hydrogenation rate of the carbon-carbon double bond contained in the polybutadiene block is 95%, and the weight average molecular weight is 80,000. Met.
実施例１〜１１および比較例１〜５
プロピレン−エチレンランダム共重合体（「Ｆ２２６Ｄ」（商品名）、グランドポリマー製、ＭＦＲ＝７（ｇ／１０分、２３０℃、２１．２Ｎ）；融点１４５℃）、共重合体（１）〜共重合体（８）、エチレン−酢酸ビニル共重合体（「ＥＶＡＦＬＥＸ４６０」（商品名）、三井デュポンポリケミカル社製；酢酸ビニル単位含有量１９質量％）、エチレン−アクリル酸エチル共重合体（「ＥＶＡＦＬＥＸ−ＥＥＡ Ａ７１０」（商品名）、三井デュポンポリケミカル社製；アクリル酸エチル単位含有量１５質量％）、および粘着付与樹脂（「アルコンＰ１５０」（商品名）荒川化学製；軟化点１５０℃）を、表１および表２に示した配合に基づき、２７ｍｍφの二軸押出機を用いて２３０℃で混練してＴダイで押出し、２５℃のロールで急冷して未延伸フィルムを得た。続いて、フィルムを幅方向に５０℃で３倍に延伸して厚さ約５０μｍの熱収縮性フィルムを作製した。得られた熱収縮性フィルムについて、透明性、収縮率、印刷性、ヒートシール、溶剤接着性、延伸性を評価した。得られた熱収縮性フィルムの物性を表１および表２に示す。
Examples 1 to 11 and Comparative Examples 1 to 5
Propylene-ethylene random copolymer (“F226D” (trade name), manufactured by Grand Polymer, MFR = 7 (g / 10 min, 230 ° C., 21.2 N); melting point 145 ° C.), copolymer (1) to copolymer (1) Polymer (8), ethylene-vinyl acetate copolymer (“EVAFLEX460” (trade name), manufactured by Du Pont-Mitsui Polychemicals; vinyl acetate unit content 19% by mass), ethylene-ethyl acrylate copolymer (“EVAFLEX”) -EEA A710 "(trade name), manufactured by DuPont-Mitsui Polychemicals; ethyl acrylate unit content 15% by mass, and tackifying resin (" Alcon P150 "(trade name) manufactured by Arakawa Chemical; softening point 150 ° C). Based on the formulations shown in Tables 1 and 2, kneaded at 230 ° C. using a 27 mmφ twin screw extruder, extruded with a T-die, and quenched with a roll at 25 ° C. To obtain an unstretched film. Subsequently, the film was stretched three times in the width direction at 50 ° C. to prepare a heat-shrinkable film having a thickness of about 50 μm. The resulting heat-shrinkable film was evaluated for transparency, shrinkage, printability, heat sealing, solvent adhesion, and stretchability. Tables 1 and 2 show the physical properties of the obtained heat-shrinkable film.
表１および表２より、実施例１〜１１で得られた熱収縮性フィルムは、透明性が良好で８０℃での熱収縮性に優れ、処理温度による収縮率の変化が小さく、さらに印刷性、ヒートシール性、溶剤接着性、延伸性に優れることが判る。
これに対し、比較例１で得られた熱収縮性フィルムでは処理温度による収縮率の変化が大きく、印刷性、ヒートシール性、溶剤接着性、延伸性にいずれも劣る。比較例２および比較例３で得られた熱収縮性フィルムでは十分な収縮率が得られない。また、比較例４および比較例５で得られた熱収縮性フィルムではヒートシール性、溶剤接着性、および延伸性に劣る。
From Tables 1 and 2, the heat-shrinkable films obtained in Examples 1 to 11 have good transparency, excellent heat-shrinkability at 80 ° C., a small change in shrinkage depending on the processing temperature, and further printability. It can be seen that they have excellent heat sealability, solvent adhesion, and stretchability.
On the other hand, in the heat-shrinkable film obtained in Comparative Example 1, the change in shrinkage depending on the processing temperature is large, and all of the printability, heat sealability, solvent adhesion, and stretchability are poor. The heat-shrinkable films obtained in Comparative Examples 2 and 3 cannot obtain a sufficient shrinkage. Further, the heat-shrinkable films obtained in Comparative Examples 4 and 5 are inferior in heat sealability, solvent adhesiveness, and stretchability.
本発明の熱収縮性フィルムは、収縮性に優れ、かつ処理温度による収縮率の変化が小さく、さらに透明性、印刷性、ヒートシール性、溶剤接着性、および延伸性に優れるので、それらの特性を活かして、例えば熱可塑性樹脂製の成型品、金属、磁器、ガラス、紙などの包装用またはラベル用の熱収縮性フィルムに好適に利用できる。
また、本発明の熱収縮性フィルムは、従来の塩化ビニル樹脂系の熱収縮性フィルムに比べ衛生上優れており、生鮮食品類、菓子類、衣類、文具類などの包装にも使用できる。
The heat-shrinkable film of the present invention is excellent in shrinkage, and has a small change in shrinkage due to the processing temperature, and further has excellent transparency, printability, heat sealability, solvent adhesiveness, and stretchability, and thus their properties. By taking advantage of this, it can be suitably used as a heat-shrinkable film for packaging or labeling of molded articles made of thermoplastic resin, metal, porcelain, glass, paper, and the like.
Further, the heat-shrinkable film of the present invention is more hygienic than conventional heat-shrinkable films based on vinyl chloride resin, and can be used for packaging fresh foods, confectioneries, clothing, stationery and the like.
Claims (3)
を含有する樹脂組成物からなるフィルムを少なくとも１軸方向に延伸してなる熱収縮性フィルム。 (A) 100 parts by mass of a polypropylene polymer, (b) a block A mainly composed of an aromatic vinyl compound and a block B mainly composed of a conjugated diene compound, and the content of the block A is 5 to 55. % By mass, the hydrogenation rate of the carbon-carbon double bond based on the conjugated diene compound contained in the block B is 50% or more, and the block having a glass transition point in the range of −40 ° C. to 60 ° C. 5 to 200 parts by mass of the polymer;
A heat-shrinkable film obtained by stretching a film made of a resin composition containing at least one axis.
The heat shrinkability according to claim 1 or 2, wherein the haze after stretching is 3% or less, and the shrinkage in the stretching direction after treatment at 80 ° C for 3 minutes is 20% or more. the film.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006249306A (en) * | 2005-03-11 | 2006-09-21 | Riken Technos Corp | Flame-retardant film |
| JP2007308525A (en) * | 2006-05-16 | 2007-11-29 | Kuraray Co Ltd | Triblock copolymer pellet and polymer composition |
| JP2008133315A (en) * | 2006-11-27 | 2008-06-12 | Asahi Kasei Chemicals Corp | Thermally shrinkable film |
| JP2009521581A (en) * | 2005-12-22 | 2009-06-04 | ダウ グローバル テクノロジーズ インコーポレイティド | Blend of styrene block copolymer and propylene-alpha olefin copolymer |
| US20100298516A1 (en) * | 2006-12-21 | 2010-11-25 | Michele Grazzi | High shrink polypropylene films |
| WO2011040586A1 (en) * | 2009-09-30 | 2011-04-07 | 株式会社クラレ | Thermoplastic elastomer composition, molded article, and sealing material for medical use |
| WO2017159800A1 (en) * | 2016-03-16 | 2017-09-21 | 株式会社クラレ | Resin composition, heat sealing agent, film for liquid packaging container, liquid packaging container, liquid discharge member, and medical container |
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- 2004-01-20 JP JP2004011754A patent/JP4489445B2/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006249306A (en) * | 2005-03-11 | 2006-09-21 | Riken Technos Corp | Flame-retardant film |
| JP2009521581A (en) * | 2005-12-22 | 2009-06-04 | ダウ グローバル テクノロジーズ インコーポレイティド | Blend of styrene block copolymer and propylene-alpha olefin copolymer |
| JP2012184436A (en) * | 2005-12-22 | 2012-09-27 | Dow Global Technologies Llc | BLEND OF STYRENIC BLOCK COPOLYMER AND PROPYLENE-α OLEFIN COPOLYMER |
| JP2007308525A (en) * | 2006-05-16 | 2007-11-29 | Kuraray Co Ltd | Triblock copolymer pellet and polymer composition |
| JP2008133315A (en) * | 2006-11-27 | 2008-06-12 | Asahi Kasei Chemicals Corp | Thermally shrinkable film |
| US20100298516A1 (en) * | 2006-12-21 | 2010-11-25 | Michele Grazzi | High shrink polypropylene films |
| US8207285B2 (en) * | 2006-12-21 | 2012-06-26 | Basell Poliolefine Italia S.R.L. | High shrink polypropylene films |
| WO2011040586A1 (en) * | 2009-09-30 | 2011-04-07 | 株式会社クラレ | Thermoplastic elastomer composition, molded article, and sealing material for medical use |
| WO2017159800A1 (en) * | 2016-03-16 | 2017-09-21 | 株式会社クラレ | Resin composition, heat sealing agent, film for liquid packaging container, liquid packaging container, liquid discharge member, and medical container |
| US10822485B2 (en) | 2016-03-16 | 2020-11-03 | Kuraray Co., Ltd. | Resin composition, heat sealing agent, film for liquid packaging container, liquid packaging container, liquid discharge member, and medical container |
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