WO2014185463A1 - 易剥離性積層フィルム及びそれからなる包装体 - Google Patents
易剥離性積層フィルム及びそれからなる包装体 Download PDFInfo
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- WO2014185463A1 WO2014185463A1 PCT/JP2014/062871 JP2014062871W WO2014185463A1 WO 2014185463 A1 WO2014185463 A1 WO 2014185463A1 JP 2014062871 W JP2014062871 W JP 2014062871W WO 2014185463 A1 WO2014185463 A1 WO 2014185463A1
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- Prior art keywords
- layer
- heat
- weight
- density polyethylene
- laminated film
- Prior art date
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- 239000000203 mixture Substances 0.000 claims abstract description 55
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 46
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 46
- 229920000098 polyolefin Polymers 0.000 claims abstract description 35
- 229920001179 medium density polyethylene Polymers 0.000 claims abstract description 34
- 239000004701 medium-density polyethylene Substances 0.000 claims abstract description 34
- 229920000573 polyethylene Polymers 0.000 claims abstract description 32
- 229920001155 polypropylene Polymers 0.000 claims abstract description 31
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000005977 Ethylene Substances 0.000 claims abstract description 28
- 229920001577 copolymer Polymers 0.000 claims abstract description 16
- 239000010410 layer Substances 0.000 claims description 185
- 238000000034 method Methods 0.000 claims description 32
- 229920001903 high density polyethylene Polymers 0.000 claims description 29
- 239000004700 high-density polyethylene Substances 0.000 claims description 29
- 229920000642 polymer Polymers 0.000 claims description 29
- 239000012793 heat-sealing layer Substances 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 20
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 15
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 15
- 229920001684 low density polyethylene Polymers 0.000 claims description 12
- 239000004702 low-density polyethylene Substances 0.000 claims description 12
- 239000005001 laminate film Substances 0.000 claims description 4
- 230000004927 fusion Effects 0.000 abstract description 16
- 238000007789 sealing Methods 0.000 description 27
- -1 polypropylene Polymers 0.000 description 22
- 239000004743 Polypropylene Substances 0.000 description 18
- 238000004806 packaging method and process Methods 0.000 description 18
- 238000002156 mixing Methods 0.000 description 17
- 238000003851 corona treatment Methods 0.000 description 12
- 240000007594 Oryza sativa Species 0.000 description 11
- 235000007164 Oryza sativa Nutrition 0.000 description 11
- 230000000704 physical effect Effects 0.000 description 11
- 239000004711 α-olefin Substances 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 9
- 235000009566 rice Nutrition 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 235000015110 jellies Nutrition 0.000 description 8
- 239000008274 jelly Substances 0.000 description 8
- 229920005604 random copolymer Polymers 0.000 description 8
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 150000007934 α,β-unsaturated carboxylic acids Chemical class 0.000 description 6
- 239000012790 adhesive layer Substances 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005992 thermoplastic resin Polymers 0.000 description 5
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 4
- 125000004432 carbon atom Chemical group C* 0.000 description 4
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 4
- 239000005022 packaging material Substances 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000003963 antioxidant agent Substances 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229910021645 metal ion Inorganic materials 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- ZGEGCLOFRBLKSE-UHFFFAOYSA-N 1-Heptene Chemical compound CCCCCC=C ZGEGCLOFRBLKSE-UHFFFAOYSA-N 0.000 description 2
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- 235000007189 Oryza longistaminata Nutrition 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 239000002216 antistatic agent Substances 0.000 description 2
- 235000013527 bean curd Nutrition 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000009820 dry lamination Methods 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000005227 gel permeation chromatography Methods 0.000 description 2
- 229920001519 homopolymer Polymers 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000004310 lactic acid Substances 0.000 description 2
- 235000014655 lactic acid Nutrition 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 238000009832 plasma treatment Methods 0.000 description 2
- 229920013716 polyethylene resin Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 235000013606 potato chips Nutrition 0.000 description 2
- 235000011962 puddings Nutrition 0.000 description 2
- 235000019685 rice crackers Nutrition 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 235000011888 snacks Nutrition 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- 229920001567 vinyl ester resin Polymers 0.000 description 2
- 235000013618 yogurt Nutrition 0.000 description 2
- NPSJHQMIVNJLNN-UHFFFAOYSA-N 2-ethylhexyl 4-nitrobenzoate Chemical compound CCCCC(CC)COC(=O)C1=CC=C([N+]([O-])=O)C=C1 NPSJHQMIVNJLNN-UHFFFAOYSA-N 0.000 description 1
- 239000004808 2-ethylhexylester Substances 0.000 description 1
- GVNWZKBFMFUVNX-UHFFFAOYSA-N Adipamide Chemical compound NC(=O)CCCCC(N)=O GVNWZKBFMFUVNX-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 1
- 108700018427 F 327 Proteins 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
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 235000015241 bacon Nutrition 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 description 1
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- NKHAVTQWNUWKEO-UHFFFAOYSA-N fumaric acid monomethyl ester Natural products COC(=O)C=CC(O)=O NKHAVTQWNUWKEO-UHFFFAOYSA-N 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 239000002650 laminated plastic Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 229920003145 methacrylic acid copolymer Polymers 0.000 description 1
- 229940117841 methacrylic acid copolymer Drugs 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- NKHAVTQWNUWKEO-IHWYPQMZSA-N methyl hydrogen fumarate Chemical compound COC(=O)\C=C/C(O)=O NKHAVTQWNUWKEO-IHWYPQMZSA-N 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000012748 slip agent Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 238000007666 vacuum forming Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/748—Releasability
Definitions
- the present invention relates to an easily peelable laminated film excellent in easy peelability and sealing property, and a package using such an easily peelable laminated film.
- Packaging for snacks such as rice crackers, potato chips, or any other jelly such as fruit jelly
- assorted rice such as milk, yogurt, pudding, tofu, and white rice
- retort rice such as red rice and gomoku rice
- all food packaging such as lactic acid beverages
- Sealing plastic containers such as plastic laminate film or aluminum foil laminate film for bottles, cups or tray-like polypropylene or polystyrene as blister packaging
- pharmaceuticals, medical equipment packaging, and other daily necessities and miscellaneous goods packaging Wrapped packaging is widely adopted. What is required for such packaging is mechanical strength that can withstand distribution channels, sealing strength that can maintain hygiene, and good openability during use.
- an easy-opening package comprising a mixture layer of a polypropylene resin and a polyethylene resin and a high-density polyethylene resin layer
- Patent Document 1 Special
- Patent Document 2 JP-B-5 No. 6513
- a film in which a mixture layer of a polypropylene resin and a polyethylene resin is merely a heat-sealing layer is not always satisfactory in terms of the balance between sealing performance and easy opening performance.
- an easily openable sealing material comprising an olefin polymer composition in which an ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer is added to a propylene polymer and an ethylene polymer has been proposed.
- an easily openable sealing material comprising an olefin polymer composition in which an ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer is added to a propylene polymer and an ethylene polymer.
- a heat fusion layer comprising a polyolefin composition in which an ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer is added to a propylene polymer and an ethylene polymer.
- a laminate layer made of an ethylene polymer Patent Document 4: Japanese Patent Application Laid-Open No. 2004-42450
- obtaining an easily peelable laminated film excellent in easy peelability even when the heat fusion temperature becomes high is obtained.
- the problem of the present invention is that it can be easily peeled even when the heat-sealing temperature is increased, and can withstand external pressure (external pressure) and internal pressure (internal pressure) even at a temperature higher than room temperature.
- the object is to develop an easily peelable laminated film having sealing strength and a packaging body using the easily peelable laminated film.
- the easily peelable laminated film characterized by comprising the heat-fusible layer which consists of an olefin polymer composition (C) containing], and the package body using the said easily peelable laminated film.
- the easily peelable laminated film of the present invention is itself excellent in blocking resistance, hygiene, film forming workability, and laminate workability, and the easily peelable laminated film is replaced with other members or easily peelable laminated films.
- heat-sealing with a propylene polymer layer which is a heat-sealing layer, has stable heat-sealing strength (peeling strength) in a wide temperature range, and easy when peeling (opening) Moreover, it has a strong sealing strength (internal pressure strength) even at a temperature higher than room temperature.
- the linear low density polyethylene (A) which is a component constituting the laminate layer of the easily peelable laminated film of the present invention, is usually manufactured and sold under the names of linear low density polyethylene, L-LDPE, and the like.
- An ⁇ -olefin random copolymer usually having a density in the range of 0.905 to less than 0.930 g / cm 3 , preferably 0.910 to 0.928 g / cm 3 .
- the ⁇ -olefin copolymerized with ethylene is usually an ⁇ -olefin having 4 or more carbon atoms, preferably 1-butene, 1-heptene, 1-octene, 4-methyl-1-pentene.
- the MFR (ASTM D1238 load 2160 g, temperature 190 ° C.) is usually 1 to 30 g / 10 min, as long as the linear low density polyethylene (A) according to the present invention has film-forming ability, but the MFR is not particularly limited. Preferably, it is in the range of 1 to 10 g / 10 minutes.
- the linear low density polyethylene (A) according to the present invention has a molecular weight distribution (weight average molecular weight: Mw, number average molecular weight: Mn, ratio: expressed as Mw / Mn) of 1.5 to 4.0. More preferably, it is in the range of 1.8 to 3.5. This Mw / Mn can be measured by gel permeation chromatography (GPC).
- the linear low density polyethylene (A) according to the present invention has one or more sharp peaks determined from an endothermic curve measured at a temperature rising rate of 10 ° C./min of a differential scanning calorimeter (DSC),
- the peak maximum temperature, that is, the melting point is preferably 70 to 130 ° C., more preferably in the range of 80 to 120 ° C.
- the linear low density polyethylene (A) according to the present invention can be prepared by a conventionally known production method using a single site catalyst.
- linear low density polyethylene (L-LDPE) can be prepared using a catalyst containing a metallocene compound of a transition metal.
- the catalyst containing the metallocene compound is preferably formed from (a) a transition metal metallocene compound, (b) an organoaluminum oxy compound, and (c) a carrier, and if necessary, these components and (D) It may be formed from an organoaluminum compound and / or an organoboron compound.
- a catalyst for olefin polymerization containing such a metallocene compound and a method for preparing linear low density polyethylene (L-LDPE) using the catalyst are described in, for example, JP-A-8-269270.
- the linear low density polyethylene (A) according to the present invention may be used together with other polymers including other ethylene polymers.
- the other polymers generally constitute a laminate layer.
- the amount of the polymer component is less than 50%, more preferably 30% by weight or less, and still more preferably 20% by weight or less.
- linear low density polyethylene (A) In the linear low density polyethylene (A) according to the present invention, various known additives that are usually added to an olefin polymer, for example, an antioxidant, a weathering stabilizer, a charge, are included within the range not impairing the object of the present invention.
- Anti-fogging agents, anti-fogging agents, anti-blocking agents, slip agents (lubricants) and the like can be blended as necessary.
- the ethylene polymer (B) constituting the intermediate layer (layer between the laminate layer and the heat-sealing layer) of the easily peelable laminated film of the present invention has a density of 0.905 to 0.970 g / cm 3 .
- MFR ASTM D1238 load 2160 g, temperature 190 ° C.
- MFR is preferably 1 to 30 g / 10 min, more preferably 1 to 10 g / 10 min ethylene homopolymer or ethylene and a small amount of an ⁇ -olefin having 3 to 10 carbon atoms, such as propylene, butene-1, heptene-1, hexene-1, octene-1, 4-methyl
- a random copolymer with pentene-1 which is a so-called polymer mainly composed of ethylene, which is called as exemplified below.
- High-pressure low-density polyethylene [normally range density less than 0.905 g / cm 3 or more ⁇ 0.930 g / cm 3]
- Linear low-density polyethylene also referred to as linear low-density polyethylene (L-LDPE) [usually in a density range of 0.905 g / cm 3 or more to less than 0.930 g / cm 3 ]
- Medium density polyethylene MDPE
- MDPE Medium density polyethylene
- High density polyethylene (HDPE) [usually in the range of density exceeding 0.945 g / cm 3 to 0.970 g / cm 3 or less]
- These ethylene polymers (B) may be a single polymer or a composition (mixture) of two or more ethylene polymers. These can be used as an ethylene polymer composition.
- the polymer constituting the intermediate layer is medium density polyethylene or high density polyethylene.
- the ethylene polymer (B) may be used together with other polymers in addition to medium density polyethylene and high density polyethylene, and other ethylene polymers such as the above-mentioned linear low density polyethylene (A). May be included.
- the other polymer is generally less than 50% by weight of the polymer constituting the intermediate layer, preferably 30% by weight or less, more preferably 20% by weight or less.
- a composition comprising high-density polyethylene (HDPE: B1) and high-pressure method low-density polyethylene (HP-LDPE: B2) as the ethylene-based polymer (B) is excellent in film forming properties and easily peelable.
- HDPE high-density polyethylene
- HP-LDPE high-pressure method low-density polyethylene
- high-density polyethylene (HDPE: B1) and high-pressure method low-density polyethylene (HP-LDPE: B2) is used as the ethylene-based polymer (B) according to the present invention
- high-density polyethylene (B1 ) Is in the range of 95 to 70% by weight, more preferably 90 to 80% by weight
- ⁇ It is in.
- ethylene polymer (B) In the ethylene polymer (B) according to the present invention, various known additives that are usually added to the olefin polymer, for example, an antioxidant, a weathering stabilizer, an antistatic agent, as long as the object of the present invention is not impaired.
- an agent, an antifogging agent, an antiblocking agent, a slipping agent (lubricant) and the like can be blended as necessary.
- the propylene polymer (C1) which is a constituent component of the olefin polymer composition (C) constituting the heat-fusible layer of the easily peelable laminated film of the present invention, is a resin that is generally manufactured and sold under the name of polypropylene.
- the density is 0.890 to 0.930 g / cm 3 and the MFR (ASTM D1238 load 2160 g, temperature 230 ° C.) is 0.1 to 100 g / 10 minutes, preferably 0.5 to 70 g / 10 minutes.
- the propylene / ⁇ -olefin random copolymer usually has an ethylene or other ⁇ -olefin content of 0.5 to 20 mol%, preferably 1 to 10 mol%.
- a propylene / ⁇ -olefin random copolymer having a melting point in the range of 100 to 155 ° C., preferably in the range of 110 to 145 ° C. is particularly easy to peel. Further, it is preferable because it has excellent sealing strength.
- the medium density polyethylene (C2) which is a constituent of the olefin polymer composition (C) constituting the heat-sealing layer of the easily peelable laminated film of the present invention, has a density of 0.930 to 0.945 g / cm 3 ,
- a random copolymer of ethylene and an ⁇ -olefin having 4 or more carbon atoms is preferably in the range of 0.932 to 0.940 g / cm 3 .
- the MFR is not particularly limited, but usually MFR (ASTM D1238 load 2160 g, temperature 190 ° C. ) Is in the range of 1-30 g / 10 min, preferably 1-10 g / 10 min.
- the medium density polyethylene (C2) according to the present invention is manufactured and sold under the name of linear low density polyethylene (L-LDPE) or medium density polyethylene (MDPE).
- L-LDPE linear low density polyethylene
- MDPE medium density polyethylene
- the ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer (C3) which is a constituent of the olefin polymer composition (C) constituting the heat-sealing layer of the easily peelable laminated film of the present invention, contains ethylene and ⁇ , ⁇ -unsaturated carboxylic acid, and a part or all of the ⁇ , ⁇ -unsaturated carboxylic acid may be a metal salt.
- ⁇ -unsaturated carboxylic acid, ⁇ , ⁇ -unsaturated carboxylic acid ester or carboxylic acid vinyl ester may be included as a cop
- Examples of the ⁇ , ⁇ -unsaturated carboxylic acid include acrylic acid, methacrylic acid, maleic acid, and monomethyl maleate.
- acrylic acid or methacrylic acid alkyl ester having 1 to 8 carbon atoms such as methyl, ethyl, propyl, n-butyl, isobutyl, 2-ethylhexyl ester, etc. It can be illustrated.
- a carboxylic acid vinyl ester a vinyl acetate ester can be shown as a representative example.
- the propylene polymer (C1) is 71 to 97% by weight, preferably 77 to 93% by weight
- the density polyethylene (C2) is 3 to 21% by weight, preferably 3 to 20% by weight, more preferably 6.0 to 17.3% by weight
- the ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer (D). Is 0 to 8% by weight, preferably 1 to 5.7% by weight (provided that (C1) + (C2) + (C3) 100% by weight. ].
- the heat seal strength (peel strength) may be increased and the sealing strength may be decreased. There is.
- the heat fusion layer is peeled off when the heat fusion layer is peeled off. Aggregation peeling occurs with little stringing of the layer.
- the propylene polymer (C1), the medium density polyethylene (C2) and the ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer (C3), or the olefin polymer composition (C) according to the present invention include the present invention.
- Various known additives that are usually added to the olefin polymer within a range that does not impair the purpose such as antioxidants, weathering stabilizers, antistatic agents, antifogging agents, antiblocking agents, slipping agents (lubricants), etc. Can be blended as necessary.
- the easily peelable laminated film of the present invention is a heat comprising the laminate layer containing the linear low density polyethylene (A), the intermediate layer containing the ethylene polymer (B), and the olefin polymer composition (C). It consists of a fusion layer.
- the laminate layer containing the linear low-density polyethylene (A) of the heat-fusible laminated film of the present invention has its surface in order to improve the adhesive strength when bonded to the base material layer (F) described later, Surface activation treatment such as corona treatment, flame treatment, plasma treatment, undercoat treatment, primer coat treatment, and flame treatment may be performed.
- MDPE medium density polyethylene
- HDPE high density polyethylene
- HP-LDPE high pressure method low density polyethylene
- L-LDPE linear low density polyethylene
- the thickness of the laminate layer is usually 2 to 20 ⁇ m, preferably 2 to 10 ⁇ m
- the thickness of the intermediate layer is 16 to 96 ⁇ m, preferably 16 to 56 ⁇ m
- the thickness of the heat-sealing layer Is in the range of 2 to 20 ⁇ m, preferably 2 to 10 ⁇ m
- the total thickness is in the range of 20 to 100 ⁇ m, preferably 20 to 60 ⁇ m.
- the easily peelable laminated film of the present invention can be produced by various known methods. For example, in a multilayer film molding machine equipped with three or more extruders, linear low density polyethylene (A) constituting a laminate layer in two extruders, and an ethylene polymer (B) constituting an intermediate layer.
- A linear low density polyethylene
- B ethylene polymer
- Each one, Propylene polymer (C1), medium density polyethylene (C2) and ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer which are components of the olefin polymer composition (C) constituting the heat fusion layer in another extruder A method in which a mixture (C3) is mixed in a predetermined amount and then directly put into a film forming machine to form a laminated film of two or more layers using a T-die, an annular die or the like, a propylene polymer (C1), Medium density polyethylene (C2) and ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer (C3) are mixed in a predetermined amount and melt-kneaded with an extruder or the like to obtain an olefin polymer composition (C). Thereafter, a method of forming a laminated film having three or more layers by using a T-die, an annular die or the like can be exemplified.
- the base material layer (F) laminated with the laminate layer of the heat-fusible laminated film of the present invention is made of a sheet or film made of thermoplastic resin, paper, aluminum foil, or the like.
- thermoplastic resin various known thermoplastic resins such as polyolefin (polyethylene, polypropylene, poly-4-methyl / 1-pentene, polybutene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (Nylon-6, nylon-66, polymetaxylene adipamide, etc.), polyvinyl chloride, polyimide, ethylene / vinyl acetate copolymer or saponified product thereof, polyacrylonitrile, polycarbonate, polystyrene, ionomer, or a mixture thereof Can be illustrated.
- thermoplastic resins having good stretchability and transparency such as polypropylene, polyethylene terephthalate, and polyamide
- the substrate made of such a thermoplastic resin film may be an unstretched film or a stretched film, and a laminate of one or more coextruded products, extruded laminate products, dry laminate products, etc. It may be the body.
- the base material layer (F) in order to improve the adhesiveness of one side or both sides of the base material layer (F) with the laminate layer of the easily peelable laminated film, for example, corona treatment, flame treatment, plasma treatment, undercoat treatment, primer coat treatment. Alternatively, surface activation treatment such as frame treatment may be performed.
- the thickness of the base material layer (F) is usually in the range of 5 to 1000 ⁇ m, preferably 9 to 100 ⁇ m.
- the propylene-based polymer constituting the heat sealing layer composed of the propylene-based polymer layer provided on the other member or the easily peelable laminated film, opposite to the heat-fusible layer of the easily peelable laminated film of the present invention although the polymer is in the same category as the propylene polymer (C1), the individual physical properties may be the same or different.
- the heat seal layer of the other member can be formed into various shapes such as a film, a sheet, a tray, a cup, and a bottle by a known method using a propylene-based polymer in accordance with the material to be packaged.
- another member when another member is a film or a sheet
- a tray or a cup it can be produced by once producing a sheet by the above method and then forming a container such as a tray or a cup by thermoforming such as vacuum forming or pressure forming.
- a cup or bottle it can be molded as a container by injection molding, injection hollow molding (injection blow), hollow molding or the like.
- a propylene-based polymer may be laminated by extrusion lamination or extrusion coating, dry lamination, or the like on the base material layer such as paper.
- the package of the present invention is used for various packaging applications including lid materials.
- the lid material of the present invention has the heat-sealing layer of the easily peelable laminated film as the innermost layer.
- the various materials exemplified as the base material layer are usually laminated on the heat-sealing film.
- the package of the present invention is a package having a heat sealing layer composed of a heat-sealing layer of the easily peelable laminated film and a propylene-based polymer layer on opposite surfaces.
- the shape of the package of the present invention can take various shapes depending on the shape, form or application of the material to be packaged.
- a packaging material is filled in a three-sided sealing bag composed of an easily peelable laminated film and a film having a heat sealing layer composed of a propylene-based polymer layer, and then the mouth is heat sealed.
- the four-sided sealed package, the sheet, tray, cup, bottle, etc. with a heat-sealed layer composed of a propylene-based polymer layer, which is another member, are filled with the packaging material, and then the easily peelable laminated film Examples include a package formed by sealing the upper surface with a lid material (sealing material) having a heat-fusible layer as an innermost layer.
- the heat-sealing layer and the polypropylene sheet of each laminated film were overlapped, and sealed at a predetermined temperature shown in Table 1 at a pressure of 0.2 MPa for 1 second using a sealer having a width of 5 mm. And then left to cool. Thereafter, the heat-sealed test specimen was treated at 115 ° C. for 30 minutes using a high-temperature and high-pressure sterilizer (retort treatment equipment), and then the specimen was cooled. A 15 mm wide test piece was cut out and the heat seal portion was peeled off at a cross bed speed of 500 mm / min, and the strength was set as the heat seal strength (N / 15 mm).
- Evaluation of easy peelability was performed by confirming the peeled state in addition to the heat seal strength, and the case where the film was not peeled off by stringing or film-like peeling due to delamination with a tendency of cohesive peeling was marked as ⁇ .
- Evaluation of sealing strength simply as with practical fruit jelly Using a laminated product made to evaluate easy peelability as a lid, PP-based barrier containers (PP / adhesive layer / EVOH / adhesive layer / PP) used for commercially available pulp jelly etc. are used. And evaluated.
- the contents of commercially available pulp jelly are heated to 60 ° C., melted and transferred to a container, and the laminated product thus prepared is used as a cover material with a simple cup sealer at a temperature of 185 ° C. for 1 hour.
- Heat-sealing was performed at a pressure of 1600 N / cup, actual pressure 0 times ⁇ 1.
- a rubber sheet piece with an adhesive tape is attached to the top surface of the lid material in which the contents are held at about 60 ° C., and a needle is inserted from this sheet surface.
- Sealing strength (MPa) was measured using a seal strength measuring instrument (based on JIS-Z0238).
- C2 Medium density polyethylene (C2) Medium density polyethylene (MDPE) (manufactured by Prime Polymer Co., Ltd., trade name Neozex: NZ3510F density; 0.935 g / cm 3 , MFR; 1.6 g / 10 min).
- C3 Ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer (C3)
- Ethylene polymer (B) (4-1) High density polyethylene (B1) High density polyethylene (HDPE) (manufactured by Prime Polymer Co., Ltd., trade name: HYZEX: HZ3300F, density: 0.954 g / cm 3 , MFR: 1.1 g / 10 min). (4-2) High pressure low density polyethylene (B2) High pressure method low density polyethylene (HP-LDPE) (manufactured by Prime Polymer Co., Ltd., trade name: Mirason: M-11P density; 0.917 g / cm 3 , MFR; 7.2 g / 10 min).
- B1 High density polyethylene (B1) High density polyethylene (HDPE) (manufactured by Prime Polymer Co., Ltd., trade name: HYZEX: HZ3300F, density: 0.954 g / cm 3 , MFR: 1.1 g / 10 min).
- B2 High pressure low density polyethylene
- HP-LDPE High pressure method low density poly
- Linear low density polyethylene (A) Linear low-density polyethylene (L-LDPE) (manufactured by Prime Polymer Co., Ltd., trade name: Ultrazex: UZ3523L density; 0.931 g / cm 3 , MFR; 2.1 g / 10 min).
- Example 2 An olefin polymer composition obtained by dry blending 80% by weight, MDPE; 15% by weight and EMC; 5% by weight as a heat-sealing layer, and HDPE; 85% by weight and HP as an intermediate layer.
- -LDPE Ethylene polymer composition dry-blended with 15% by weight, using L-LDPE as a laminate layer, each supplied to separate extruders, and heat fusion layer / intermediate layer / lamine by T-die method A heat-fusible laminated film made of a three-layer coextruded film having a structure to become a layer was formed, and the laminate layer was subjected to corona treatment.
- Example 3 An olefin polymer composition obtained by dry blending R-PP; 85% by weight, MDPE; 11.7% by weight and EMC; 3.3% by weight as a heat-fusible layer, and HDPE; 85 as an intermediate layer.
- the ethylene polymer composition obtained by dry blending 15% by weight and HP-LDPE; 15% by weight was supplied to separate extruders using L-LDPE as the laminate layer, and heat-melted by the T-die method.
- a heat-fusible laminated film composed of a three-layer coextruded film having a structure of an adhesion layer / intermediate layer / laminate layer was formed, and the laminate layer was subjected to corona treatment.
- Example 4 An olefin polymer composition obtained by dry blending 90% by weight, MDPE; 8.3% by weight and EMC; 1.7% by weight as a thermal fusion layer, HDPE as an intermediate layer; 85 The ethylene polymer composition obtained by dry blending 15% by weight and HP-LDPE; 15% by weight was supplied to separate extruders using L-LDPE as the laminate layer, and heat-melted by the T-die method.
- a heat-fusible laminated film composed of a three-layer coextruded film having a structure of an adhesive layer / intermediate layer / laminate layer was formed, and the laminate layer was subjected to corona treatment.
- a heat-fusible laminated film composed of a three-layer coextruded film having a structure of an adhesive layer / intermediate layer / laminate layer was formed, and the laminate layer was subjected to corona treatment.
- the heat-sealing layer composed of the olefin polymer composition is mainly composed of a heat-resistant propylene polymer, and less ethylene polymer and ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer.
- the easy-openability of the easy-to-open laminate film with a sealing property composed of a laminate layer composed of a linear low density polyethylene (A), which is appropriately blended in quantity, is easier to open softly than the comparative example. Nevertheless, it is clear that the sealing strength is maintained without decreasing.
- the easily peelable film of the present invention is suitable as a film for packaging, particularly as a cover material for polypropylene sheets, trays, cups, bottles, etc., taking advantage of the above properties, and packaging for snacks such as rice cracker potato chips, or Jelly such as pulp jelly, milk, yogurt, pudding, tofu, aseptic rice such as white rice, retort rice such as red rice and gomoku rice, all food packaging such as lactic acid beverages, packaging of pharmaceuticals, medical instruments, blister It can be suitably used as a packaging material for packaging and other packaging such as daily necessities and sundries.
- This function can be used not only as a packaging material using a container and a lid, but also as a packaging body such as a bag such as a flat bag or a standing pouch. Further, the container and the lid can be used not only for a hard container such as jelly but also for a flexible package such as sliced ham, bacon and rice cake kamaboko for food.
Landscapes
- Wrappers (AREA)
- Laminated Bodies (AREA)
- Packages (AREA)
Abstract
Description
本発明の易剥離性積層フィルムのラミネート層を構成する成分である線状低密度ポリエチレン(A)は、通常、線状低密度ポリエチレン、L-LDPEなどの名称で製造・販売されているエチレン・α-オレフィンランダム共重合体であり、通常、密度が0.905~0.930g/cm3未満、好ましくは0.910~0.928g/cm3の範囲にある。
本発明の易剥離性積層フィルムの中間層(ラミネート層と熱融着層との間の層)を構成するエチレン系重合体(B)は、密度が0.905~0.970g/cm3であることが好ましく、さらに好ましくは0.920~0.960g/cm3であり、MFR(ASTM D1238 荷重2160g、温度190℃)が1~30g/10分であることが好ましく、さらに好ましくは1~10g/10分の、エチレンの単独重合体、若しくはエチレンと少量の炭素数が3~10のα-オレフィン、例えばプロピレン、ブテン-1、ヘプテン-1、ヘキセン-1、オクテン-1、4-メチル-ペンテン-1とのランダム共重合体で、いわゆる、以下に例示されるように呼ばれているエチレンを主体とした重合体である。
高圧法低密度ポリエチレン(HP-LDPE)〔通常、密度が0.905g/cm3以上~0.930g/cm3未満の範囲〕、
線状低密度ポリエチレン(直鎖状低密度ポリエチレンともいう)(L-LDPE)〔通常、密度が0.905g/cm3以上~0.930g/cm3未満の範囲〕、
中密度ポリエチレン(MDPE)〔通常、密度が0.930g/cm3以上~0.945g/cm3以下の範囲〕、
高密度ポリエチレン(HDPE)〔通常、密度が0.945g/cm3を超え~0.970g/cm3以下の範囲〕
これらエチレン系重合体(B)は、単一の重合体であっても、二種以上のエチレン系重合体の組成物(混合物)であってもよい。これらはエチレン重合体組成物として用いることができる。
本発明の易剥離性積層フィルムの熱融着層を構成するオレフィン重合体組成物(C)の構成成分であるプロピレン重合体(C1)は、一般にポリプロピレンの名称で製造・販売されている樹脂で、通常、密度が0.890~0.930g/cm3、MFR(ASTM D1238 荷重2160g、温度230℃)が0.1~100g/10分、好ましくは0.5~70g/10分のプロピレンの単独重合体若しくはプロピレンと他の少量のα-オレフィン、例えばエチレン、1-ブテン、1-ヘキセン等の一種以上のα-オレフィンとのランダムあるいはブロック共重合体であり、とくにランダム共重合体が好適である。プロピレン・α-オレフィンランダム共重合体としては、通常、エチレンまたは他のα-オレフィンの含量が0.5~20モル%、好ましくは1~10モル%にある。
<中密度ポリエチレン(C2)>
本発明の易剥離性積層フィルムの熱融着層を構成するオレフィン重合体組成物(C)の構成成分である中密度ポリエチレン(C2)は、密度が0.930~0.945g/cm3、好ましくは0.932~0.940g/cm3の範囲にあるエチレンと炭素数4以上のα-オレフィンとのランダム共重合体である。
<エチレン・α,β-不飽和カルボン酸共重合体(C3)>
本発明の易剥離性積層フィルムの熱融着層を構成するオレフィン重合体組成物(C)の構成成分であるエチレン・α,β-不飽和カルボン酸共重合体(C3)は、エチレンとα,β-不飽和カルボン酸との共重合体であって、α,β-不飽和カルボン酸の一部あるいは全部が金属塩となっていてもよい。又、α,β-不飽和カルボン酸の他に、α,β-不飽和カルボン酸エステルやカルボン酸ビニルエステルを共重合成分として含んでいてもよい。
<オレフィン重合体組成物(C)>
本発明の易剥離性積層フィルムの熱融着層を構成するオレフィン重合体組成物(C)は、前記プロピレン重合体(C1)が71~97重量%、好ましくは77~93重量%、前記中密度ポリエチレン(C2)が3~21重量%、好ましくは3~20重量%、さらに好ましくは6.0~17.3重量%、及びエチレン・α,β-不飽和カルボン酸共重合体(D)が0~8重量%、好ましくは1~5.7重量%〔但し、(C1)+(C2)+(C3)=100重量%とする。〕とから構成される。
<易剥離性積層フィルム>
本発明の易剥離性積層フィルムは、前記線状低密度ポリエチレン(A)を含むラミネート層、前記エチレン系重合体(B)を含む中間層、及び前記オレフィン重合体組成物(C)からなる熱融着層とからなる。
、
(熱融着層) オレフィン重合体組成物
(中間層) HDPE
(ラミネート層)L-LDPE
、
(熱融着層) オレフィン重合体組成物
(中間層) HDPE+HP-LDPE
(ラミネート層)L-LDPE
、
(熱融着層) オレフィン重合体組成物
(中間層) HDPE+MDPE
(ラミネート層)L-LDPE
、
(熱融着層) オレフィン重合体組成物
(中間層) MDPE
(ラミネート層)L-LDPE等
、
一般にヒートシール強度はフィルム総厚や熱融着層の厚さが厚くなるほど大きくなることが知られているが、本発明の易剥離性積層フィルムの厚さは、用途に応じて適宜決め得る。
本発明の易剥離性積層フィルムは種々公知の方法で製造できる。例えば、三つ以上の押出し機を備えた多層フィルム成形機に、二つの押出し機にラミネート層を構成する線状低密度ポリエチレン(A)、及び中間層を構成するエチレン系重合体(B)を夫々投入し、
他の押出し機に熱融着層を構成するオレフィン重合体組成物(C)の成分であるプロピレン重合体(C1)、中密度ポリエチレン(C2)及びエチレン・α,β-不飽和カルボン酸共重合体(C3)とを所定の量で混合した後、直接フィルム成形機に投入してT-ダイ、環状ダイ等を用いて二層以上の積層フィルムにする方法、予めプロピレン重合体(C1)、中密度ポリエチレン(C2)及びエチレン・α,β-不飽和カルボン酸共重合体(C3)とを所定の量で混合して押出機等で溶融混練してオレフィン重合体組成物(C)を得た後、T-ダイ、環状ダイ等を用いて三層以上の積層フィルムにする方法が例示できる。
本発明の熱融着性積層フィルムのラミネート層と積層される基材層(F)は、熱可塑性樹脂からなるシート状またはフィルム状のもの、紙、アルミニウム箔等からなる。熱可塑性樹脂としては、種々公知の熱可塑性樹脂、例えば、ポリオレフィン(ポリエチレン、ポリプロピレン、ポリ4-メチル・1-ペンテン、ポリブテン等)、ポリエステル(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、ポリエチレンナフタレート等)、ポリアミド(ナイロン-6、ナイロン-66、ポリメタキシレンアジパミド等)、ポリ塩化ビニル、ポリイミド、エチレン・酢酸ビニル共重合体もしくはその鹸化物、ポリアクリロニトリル、ポリカーボネート、ポリスチレン、アイオノマー、あるいはこれらの混合物等を例示することができる。これらのうちでは、ポリプロピレン、ポリエチレンテレフタレート、ポリアミド等、延伸性、透明性が良好な熱可塑性樹脂が好ましい。又、かかる熱可塑性樹脂フィルムからなる基材は、無延伸フィルムであっても、延伸フィルムであっても良いし、1種或いは2種以上の共押し出し品、押出しラミ品、ドライラミ品等の積層体であっても良い。
<熱シール層>
本発明の易剥離性積層フィルムの熱融着層と相対する、他の部材あるいは易剥離性積層フィルムに設けられたプロピレン系重合体層からなる熱シール層を構成するプロピレン系重合体は、前記プロピレン重合体(C1)と同じ範疇の重合体であるが、個々の物性は同一であっても異なっていてもよい。かかる他の部材の熱シール層は、被包装材料に合わせてプロピレン系重合体を公知の方法でフィルム、シート、トレー、カップ、ボトル等の種々の形状とすることができる。また他の部材がフィルム若しくはシートの場合は、上記熱融着フィルムと同様な方法で製造し得る。トレー若しくはカップの場合は、一旦上記方法でシートを製造した後、真空成形、圧空成形等の熱成形によりトレー、カップ等の容器とすることにより製造し得る。又、カップあるいはボトルの場合は射出成形、射出中空成形(インジェクションブロー)、中空成形等により容器として成形し得る。更に用途によっては紙等の上記基材層にプロピレン系重合体を押出しラミネートあるいは押出しコーティング、ドライラミネ-ト等により積層してもよい。
本発明の包装体は、蓋材をはじめ種々の包装の用途に用いられる。
<蓋材>
本発明の蓋材は、前記易剥離性積層フィルムの熱融着層を最内層としてなる。蓋材とする場合には、通常前記熱融着フィルムに基材層として例示される前記種々の材料が積層される。
本発明の実施例及び比較例で得た熱融着性積層フィルムの物性は、以下の方法で測定した。
易剥離性を評価するために、厚さ12μmの二軸延伸ポリエチレンテレフタ-トフィルム(PET)に、上記各実施例、比較例で得られたフィルムのコロナ処理を施した面にウレタン系接着剤を用いてドライラミネ-ションにより積層して積層フィルムを準備し、熱シール層として厚さ300μmのポリプロピレンシ-トを準備した。
(2)実用的な果肉ゼリーと同様に簡易的に封緘強度の評価:
易剥離性を評価するために作成したラミ品を蓋材として、市販されている果肉ゼリーなどに利用されているPP系のバリア容器(PP/接着層/EVOH/接着層/PP)を使用して評価した。内容物は市販されている果肉ゼリーの内容物を60℃に加温して溶かして容器に移し、作成したラミ品を蓋材として簡易的なカップシーラーを用いて、温度185℃、時間1.0秒×1回、実圧1600N/カップの圧力でヒートシールした。ヒートシールした直後で内容物が60℃程度に保持されている状態の蓋材の上面に粘着テープ付きのゴムシート片を貼り付け、このシート面から針を差し込み、常温下で株式会社サン科学社製の封緘強度測定器を用いて(JIS-Z0238準拠)封緘強度(MPa)を測定した。
(3)総合評価:
総合的な評価として、ヒートシール強度が12N/15mmを超えないもので、且つ、封緘強度が0.45MPaを超えるものを○、ヒートシール強度が12N/15mm以上、または封緘強度が0.45MPa以下のものを△とした。
本発明の実施例及び比較例で使用した重合体を以下に示す。
(1)プロピレン重合体(C1)
プロピレン・エチレンランダム共重合体(R-PP)(プライムポリマー社製、商品名 プライムポリプロ F327 密度;0.91g/cm3、MFR;6.0g/10分、融点;138℃)。
(2)中密度ポリエチレン(C2)
中密度ポリエチレン(MDPE)(プライムポリマー社製、商品名 ネオゼックス:NZ3510F 密度;0.935g/cm3、MFR;1.6g/10分)。
(3)エチレン・α,β-不飽和カルボン酸共重合体(C3)
エチレン・メタクリル酸共重合体(EMC):メタクリル酸含有量;9重量%、MFR;3g/10分。
(4)エチレン系重合体(B)
(4-1)高密度ポリエチレン(B1)
高密度ポリエチレン(HDPE)(プライムポリマー社製、商品名 ハイゼックス:HZ3300F、密度;0.954g/cm3、MFR;1.1g/10分)。
(4-2)高圧法低密度ポリエチレン(B2)
高圧法低密度ポリエチレン(HP-LDPE)(プライムポリマー社製、商品名 ミラソン:M-11P 密度;0.917g/cm3、MFR;7.2g/10分)。
(5)線状低密度ポリエチレン(A)
線状低密度ポリエチレン(L-LDPE)(プライムポリマー社製、商品名 ウルトゼックス:UZ3523L 密度;0.931g/cm3、MFR;2.1g/10分)。
〔実施例1〕
熱融着層として、R-PP;75重量%、MDPE;18.3重量%及びEMC;6.7重量%とをドライブレンドしたオレフィン重合体組成物を、中間層としてHDPE;85重量%及びHP-LDPE;15重量%とをドライブレンドして得たエチレン系重合体組成物を、ラミネート層としてL-LDPEを用い、夫々別々の押出機に供給し、Tダイ法によって熱融着層/中間層/ラミネ-ト層となる構成の三層共押出フィルムからなる熱融着性積層フィルムを成形し、ラミネート層にコロナ処理を施した。熱融着性積層フィルムの総厚は50μmで、各層の厚みは熱融着層/中間層/ラミネ-ト層=7.5/37.5/7.5μmであった。
〔実施例2〕
熱融着層として、R-PP;80重量%、MDPE;15重量%及びEMC;5重量%とをドライブレンドして得たオレフィン重合体組成物を、中間層としてHDPE;85重量%及びHP-LDPE;15重量%とをドライブレンドしたエチレン系重合体組成物を、ラミネート層としてL-LDPEを用い、夫々別々の押出機に供給し、Tダイ法によって熱融着層/中間層/ラミネ-ト層となる構成の三層共押出フィルムからなる熱融着性積層フィルムを成形し、ラミネート層にコロナ処理を施した。熱融着性積層フィルムの総厚は50μmで、各層の厚みは熱融着層/中間層/ラミネ-ト層=7.5/37.5/7.5μmであった。
〔実施例3〕
熱融着層として、R-PP;85重量%、MDPE;11.7重量%及びEMC;3.3重量%とをドライブレンドして得たオレフィン重合体組成物を、中間層としてHDPE;85重量%及びHP-LDPE;15重量%とをドライブレンドして得たエチレン系重合体組成物を、ラミネート層としてL-LDPEを用い、夫々別々の押出機に供給し、Tダイ法によって熱融着層/中間層/ラミネ-ト層となる構成の三層共押出フィルムからなる熱融着性積層フィルムを成形し、ラミネート層にコロナ処理を施した。熱融着性積層フィルムの総厚は50μmで、各層の厚みは熱融着層/中間層/表面ラミネ-ト層=7.5/37.5/7.5μmであった。
〔実施例4〕
熱融着層として、R-PP;90重量%、MDPE;8.3重量%及びEMC;1.7重量%とをドライブレンドして得たオレフィン重合体組成物を、中間層としてHDPE;85重量%及びHP-LDPE;15重量%とをドライブレンドして得たエチレン系重合体組成物を、ラミネート層としてL-LDPEを用い、夫々別々の押出機に供給し、Tダイ法によって熱融着層/中間層/ラミネート層となる構成の三層共押出フィルムからなる熱融着性積層フィルムを成形し、ラミネート層にコロナ処理を施した。熱融着性積層フィルムの総厚は50μmで、各層の厚みは熱融着層/中間層/ラミネ-ト層=7.5/37.5/7.5μmであった。
〔実施例5〕
熱融着層として、R-PP;95重量%、MDPE;5.0重量%とをドライブレンドして得たオレフィン重合体組成物を、ラミネ-ト層として、中間層としてHDPE;85重量%及びHP-LDPE;15重量%とをドライブレンドして得たエチレン系重合体組成物を、ラミネート層としてL-LDPEを用い、夫々別々の押出機に供給し、Tダイ法によって熱融着層/中間層/ラミネート層となる構成の三層共押出フィルムからなる熱融着性積層フィルムを成形し、ラミネート層にコロナ処理を施した。熱融着性積層フィルムの総厚は50μmで、各層の厚みは熱融着層/中間層/ラミネ-ト層=7.5/37.5/7.5μmであった。
〔比較例1〕
熱融着層として、R-PP;38重量%、MDPE;43重量%及びEMC;19重量%とをドライブレンドして得たオレフィン重合体組成物を、中間層としてHDPE;85重量%及びHP-LDPE;15重量%とをドライブレンドして得たエチレン系重合体組成物を、ラミネート層としてL-LDPEを用い、夫々別々の押出機に供給し、Tダイ法によって熱融着層/中間層/ラミネート層となる構成の三層共押出フィルムからなる熱融着性積層フィルムを成形し、ラミネート層にコロナ処理を施した。熱融着性積層フィルムの総厚は50μmで、各層の厚みは熱融着層/中間層/ラミネ-ト層=7.5/37.5/7.5μmであった。
〔比較例2〕
熱融着層として、R-PP;50重量%、MDPE;35重量%及びEMC;15重量%とをドライブレンドして得たオレフィン重合体組成物を、中間層としてHDPE;85重量%及びHP-LDPE;15重量%とをドライブレンドして得たエチレン系重合体組成物を、ラミネート層としてL-LDPEを用い、夫々別々の押出機に供給し、Tダイ法によって熱融着層/中間層/ラミネート層となる構成の三層共押出フィルムからなる熱融着性積層フィルムを成形し、ラミネート層にコロナ処理を施した。熱融着性積層フィルムの総厚は50μmで、各層の厚みは熱融着層/中間層/ラミネ-ト層=7.5/37.5/7.5μmであった。
〔比較例3〕
熱融着層として、R-PP;65重量%、MDPE;25重量%及びEMC;10重量%とをドライブレンドして得たオレフィン重合体組成物を、中間層としてHDPE;85重量%及びHP-LDPE;15重量%とをドライブレンドして得たエチレン系重合体組成物を、ラミネート層としてL-LDPEを用い、夫々別々の押出機に供給し、Tダイ法によって熱融着層/中間層/ラミネート層となる構成の三層共押出フィルムからなる熱融着性積層フィルムを成形し、ラミネート層にコロナ処理を施した。熱融着性積層フィルムの総厚は50μmで、各層の厚みは熱融着層/中間層/ラミネ-ト層=7.5/37.5/7.5μmであった。
〔比較例4〕
熱融着層として、R-PP;70重量%、MDPE;21.7重量%及びEMC;8.3重量%とをドライブレンドして得たオレフィン重合体組成物を、中間層としてHDPE;85重量%及びHP-LDPE;15重量%とをドライブレンドして得たエチレン系重合体組成物を、ラミネート層としてL-LDPEを用い、夫々別々の押出機に供給し、Tダイ法によって熱融着層/中間層/ラミネート層となる構成の三層共押出フィルムからなる熱融着性積層フィルムを成形し、ラミネート層にコロナ処理を施した。熱融着性積層フィルムの総厚は50μmで、各層の厚みは熱融着層/中間層/ラミネ-ト層=7.5/37.5/7.5μmであった。
Claims (7)
- 線状低密度ポリエチレン(A)を含むラミネート層、エチレン系重合体(B)を含む中間層、及びプロピレン重合体(C1)71~97重量%、密度0.930~0.945g/cm3の中密度ポリエチレン(C2)3~21重量%及びエチレン・α,β-不飽和カルボン酸共重合体(C3)0~8重量%〔但し、(C1)+(C2)+(C3)=100重量%とする。〕を含むオレフィン重合体組成物(C)からなる熱融着層とからなることを特徴とする易剥離性積層フィルム。
- 中間層を構成するポリマーの50重量%以上が、中密度ポリエチレン、または高密度ポリエチレンであることを特徴とする請求項1記載の易剥離性積層フィルム。
- エチレン系重合体(B)が、高密度ポリエチレン(B1)及び高圧法低密度ポリエチレン(B2)を含む組成物である請求項1記載の易剥離性積層フィルム。
- 請求項1~3のいずれかに記載の易剥離性積層フィルムのラミネート層に、基材層(F)が設けられていることを特徴とする易剥離性積層フィルム。
- オレフィン重合体組成物(C)からなる熱融着層と相対する層がプロピレン系重合体層である請求項1~4のいずれかに記載の易剥離性積層フィルム。
- 請求項1~4のいずれかに記載の易剥離性積層フィルムからなる蓋材。
- 請求項1~4のいずれかに記載の易剥離性積層フィルムの熱融着層と相対する面がプロピレン系重合体層からなる熱シール層を備えたことを特徴とする包装体。
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