WO2023021852A1 - ガスバリア積層体及び容器 - Google Patents
ガスバリア積層体及び容器 Download PDFInfo
- Publication number
- WO2023021852A1 WO2023021852A1 PCT/JP2022/025824 JP2022025824W WO2023021852A1 WO 2023021852 A1 WO2023021852 A1 WO 2023021852A1 JP 2022025824 W JP2022025824 W JP 2022025824W WO 2023021852 A1 WO2023021852 A1 WO 2023021852A1
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- WIPO (PCT)
- Prior art keywords
- layer
- gas barrier
- resin
- laminate
- based resin
- Prior art date
Links
- 230000004888 barrier function Effects 0.000 title claims abstract description 78
- 239000000565 sealant Substances 0.000 claims abstract description 56
- 239000004840 adhesive resin Substances 0.000 claims abstract description 52
- 229920006223 adhesive resin Polymers 0.000 claims abstract description 52
- 239000000758 substrate Substances 0.000 claims abstract description 38
- 229920005989 resin Polymers 0.000 claims abstract description 37
- 239000011347 resin Substances 0.000 claims abstract description 37
- -1 polypropylene Polymers 0.000 claims abstract description 35
- 239000010902 straw Substances 0.000 claims description 47
- 229920005678 polyethylene based resin Polymers 0.000 claims description 26
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 24
- 229920005673 polypropylene based resin Polymers 0.000 claims description 24
- 229920000098 polyolefin Polymers 0.000 claims description 15
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 229910052809 inorganic oxide Inorganic materials 0.000 claims description 4
- 125000004122 cyclic group Chemical group 0.000 abstract description 23
- 229920005672 polyolefin resin Polymers 0.000 abstract description 22
- 229920013716 polyethylene resin Polymers 0.000 abstract description 19
- 239000004743 Polypropylene Substances 0.000 abstract description 6
- 229920001155 polypropylene Polymers 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 165
- 239000007789 gas Substances 0.000 description 61
- 239000000123 paper Substances 0.000 description 34
- 239000000463 material Substances 0.000 description 32
- 238000000034 method Methods 0.000 description 19
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- 238000001125 extrusion Methods 0.000 description 14
- 229920000642 polymer Polymers 0.000 description 11
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- 239000004702 low-density polyethylene Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- JFNLZVQOOSMTJK-KNVOCYPGSA-N norbornene Chemical compound C1[C@@H]2CC[C@H]1C=C2 JFNLZVQOOSMTJK-KNVOCYPGSA-N 0.000 description 9
- 239000011241 protective layer Substances 0.000 description 9
- 238000007740 vapor deposition Methods 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000005022 packaging material Substances 0.000 description 5
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 5
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 5
- WKBPZYKAUNRMKP-UHFFFAOYSA-N 1-[2-(2,4-dichlorophenyl)pentyl]1,2,4-triazole Chemical compound C=1C=C(Cl)C=C(Cl)C=1C(CCC)CN1C=NC=N1 WKBPZYKAUNRMKP-UHFFFAOYSA-N 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- 238000003851 corona treatment Methods 0.000 description 4
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- 239000007788 liquid Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 229920005604 random copolymer Polymers 0.000 description 4
- 239000004711 α-olefin Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 230000009477 glass transition Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229920001903 high density polyethylene Polymers 0.000 description 3
- 239000004700 high-density polyethylene Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 238000007142 ring opening reaction Methods 0.000 description 3
- 238000001771 vacuum deposition Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000012968 metallocene catalyst Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010526 radical polymerization reaction Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920001897 terpolymer Polymers 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 239000004278 EU approved seasoning Substances 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
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- 238000000151 deposition Methods 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- CGPRUXZTHGTMKW-UHFFFAOYSA-N ethene;ethyl prop-2-enoate Chemical compound C=C.CCOC(=O)C=C CGPRUXZTHGTMKW-UHFFFAOYSA-N 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
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- 235000015203 fruit juice Nutrition 0.000 description 1
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- 229930195733 hydrocarbon Natural products 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
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- 239000004707 linear low-density polyethylene Substances 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
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- 239000006082 mold release agent Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 229920006284 nylon film Polymers 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
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- 238000004544 sputter deposition Methods 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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Images
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
- B32B27/06—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
- B32B27/10—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 paper or cardboard
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/022—Mechanical properties
-
- 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
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2231/00—Means for facilitating the complete expelling of the contents
- B65D2231/02—Precut holes or weakened zones
- B65D2231/022—Precut holes or weakened zones for permitting the insertion of a tubular contents-removing device, e.g. a drinking straw
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2565/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D2565/38—Packaging materials of special type or form
- B65D2565/381—Details of packaging materials of special type or form
- B65D2565/387—Materials used as gas barriers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
- B65D5/02—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding or erecting a single blank to form a tubular body with or without subsequent folding operations, or the addition of separate elements, to close the ends of the body
- B65D5/06—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding or erecting a single blank to form a tubular body with or without subsequent folding operations, or the addition of separate elements, to close the ends of the body with end-closing or contents-supporting elements formed by folding inwardly a wall extending from, and continuously around, an end of the tubular body
- B65D5/064—Rectangular containers having a body with gusset-flaps folded outwardly or adhered to the side or the top of the container
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging
Definitions
- the present disclosure relates to gas barrier laminates and containers.
- Patent Document 1 discloses a liquid paper container formed by forming a packaging material comprising a paper substrate, a specific barrier layer, an adhesive resin layer having a specific thickness, and a heat-sealable resin layer. ing.
- a paper container may be formed with a straw piercing opening for sucking out the contained contents with a straw.
- the piercing opening of the straw is formed by forming a hole penetrating the paper substrate.
- the present disclosure provides a gas barrier laminate with excellent straw piercing properties, and a container obtained using the same.
- a gas barrier laminate has a laminate structure including a paper substrate, an adhesive resin layer, a gas barrier layer, and a sealant layer in this order, and the sealant layer comprises a polyethylene resin and At least one of the polypropylene-based resins and a cyclic olefin-based resin are included, and when the tensile elastic modulus of the gas barrier layer is TA and the tensile elastic modulus of the sealant layer is TB , TA and TB are represented by the following formula ( 1) is satisfied. ⁇ 0.26 ⁇ (T B ⁇ T A )/T A ⁇ 0.30 Expression (1)
- the gas barrier laminate according to one aspect of the present disclosure has excellent straw piercing properties. Such an effect is presumed to be produced by the following mechanism. That is, the straw piercing opening formed in the gas barrier laminate is formed with a hole penetrating the paper substrate, and comprises an adhesive resin layer, a gas barrier layer and a sealant layer in this order. Since the adhesive resin layer is on the outer layer side and the sealant layer is on the inner layer side, when a straw is pierced into the piercing port, the impact from the straw is gradually applied as the straw penetrates the adhesive resin layer and the gas barrier layer.
- the sealant layer contains at least one of a polyethylene-based resin and a polypropylene-based resin and a cyclic olefin-based resin, and the tensile elastic modulus of the gas barrier layer and the sealant layer satisfies the above formula (1).
- the sealant layer is easily broken together with the gas barrier layer.
- the gas barrier laminate has excellent straw piercing properties.
- a gas barrier laminate has a laminate structure comprising a paper substrate, an adhesive resin layer, a gas barrier layer, and a sealant layer in this order, and the adhesive resin layer At least one of a polyethylene-based resin and a polypropylene-based resin and a cyclic olefin-based resin are included, and when the tensile elastic modulus of the gas barrier layer is TA and the tensile elastic modulus of the adhesive resin layer is TC , TA and TC satisfies the following formula (2). ⁇ 0.26 ⁇ (T C ⁇ T A )/T A ⁇ 0.30 Expression (2)
- a gas barrier laminate according to another aspect of the present disclosure has excellent straw piercing properties. Such an effect is presumed to be produced by the following mechanism. That is, when a straw is pierced into the straw piercing opening, the impact applied from the straw causes the straw to penetrate the adhesive resin layer and reach the gas barrier layer.
- the adhesive resin layer contains at least one of a polyethylene-based resin and a polypropylene-based resin and a cyclic olefin-based resin, and the tensile elastic moduli of the adhesive resin layer and the gas barrier layer satisfy the above formula (2). Since the straw easily reaches the gas barrier layer due to the shock applied from the straw, the gas barrier layer is easily broken together with the adhesive resin layer.
- the gas barrier layer is torn together with the adhesive resin layer, the impact from the straw is transmitted to the sealant layer outside the gas barrier layer, and the sealant layer is easily torn. As a result, the gas barrier laminate has excellent straw piercing properties.
- the gas barrier layer includes a polyolefin film as a film base material because the container has excellent recyclability and is even more excellent in straw piercing properties, and the sealant layer and the polyolefin film are in direct contact.
- the laminate strength with the film may be 1 N/15 mm or more.
- the gas barrier layer may have a vapor deposition layer containing an inorganic oxide, since the container has excellent water resistance.
- a container according to still another aspect of the present disclosure is configured by the gas barrier laminate. This container has excellent straw piercing properties.
- a gas barrier laminate that can provide a container with excellent straw pierceability, and a container obtained using the same are provided.
- FIG. 1 is an end view schematically showing a gas barrier laminate according to one embodiment of the present disclosure.
- FIG. 2 is a perspective view schematically showing a container according to one embodiment of the present disclosure;
- FIG. 1 is an end view schematically showing a laminate according to one embodiment.
- the laminate 10 according to this embodiment has a laminate structure comprising a paper substrate 1, an adhesive resin layer 2, a gas barrier layer 3, and a sealant layer 4 in this order.
- the paper base material 1 is formed with a hole 1a passing through the paper base material 1 as a straw piercing opening.
- a protective layer 5 is arranged on the surface of the paper substrate 1 opposite to the surface in contact with the adhesive resin layer 2 .
- the gas barrier layer 3 consists of a vapor deposition layer 3a and a film substrate 3b.
- Paper substrate As the paper substrate 1, for example, paper having shapeability, bending resistance, rigidity, stiffness, strength, and the like can be used. As such paper, for example, strong sizing bleached or unbleached paper, pure white roll paper, kraft paper, cardboard and processed paper can be used.
- the basis weight of the paper base material 1 is preferably 80 to 600 g/m 2 , more preferably 200 to 450 g/m 2 , since the obtained container has better gas barrier properties.
- Desired printed patterns such as characters, figures, patterns and symbols can be arbitrarily formed on the paper substrate 1 by a normal printing method.
- the adhesive resin layer 2 contains at least one of a polyethylene-based resin and a polypropylene-based resin, and a cyclic olefin-based resin.
- Polyethylene-based resins include low-density polyethylene, high-density polyethylene, copolymer resins of polyethylene and polyvinyl acetate, and acid anhydride-modified polyethylene represented by terpolymers such as ethylene/ethyl acrylate/maleic anhydride. and epoxy compound-modified polyethylene such as ethylene-glycidyl methacrylate copolymer.
- the polyethylene-based resin is preferably low-density polyethylene because it improves the piercing property.
- Low density polyethylene includes linear low density polyethylene and branched low density polyethylene, preferably branched low density polyethylene.
- the branched low-density polyethylene is preferably obtained by high-pressure radical polymerization, more preferably by homopolymerizing ethylene by high-pressure radical polymerization.
- Such low-density polyethylene has low mechanical strength and is brittle compared to other polyolefins, so it has good puncture resistance.
- Polyethylene-based resins may be used singly or in combination of two or more.
- the density of the low-density polyethylene is preferably 0.900 g/cm 3 to 0.935 g/cm 3 , more preferably 0.915 g/cm 3 to 0.930 g/cm 3 . If the density is within the above range, the low-density polyethylene has appropriate rigidity, so that the adhesive resin layer 2 has improved film formability and extrusion suitability.
- the melting point of the polyethylene resin is preferably lower than the glass transition point (Tg) of the cyclic olefin resin, preferably 60 to 130°C, more preferably 70 to 120°C. If the melting point is within this range, coextrusion workability and compatibility are improved.
- Tg glass transition point
- Polypropylene-based resins include, for example, propylene homopolymers, propylene/ ⁇ -olefin random copolymers, acid anhydride-modified polypropylenes represented by terpolymers such as propylene/ethyl acrylate/maleic anhydride, and Epoxy compound-modified polypropylene such as propylene/glycidyl methacrylate copolymer can be used.
- propylene/ ⁇ -olefin random copolymers include propylene-ethylene copolymers, propylene-butene-1 copolymers and propylene-ethylene-butene-1 copolymers.
- the polypropylene-based resin may be synthesized using a metallocene catalyst.
- the polypropylene-based resin is preferably a propylene- ⁇ -olefin random copolymer, more preferably a propylene/ ⁇ -olefin random copolymer polymerized using a metallocene catalyst.
- the heat resistance of the adhesive resin layer 2 can be improved and the softening temperature can be increased.
- the laminate 10 can be suitably used for boiling or hot filling at 100° C. or lower, or steam heating such as retort sterilization at 100° C. or higher, or sterilization by high-pressure heating.
- Polypropylene-based resins may be used singly or in combination of two or more.
- the melting point of the polypropylene resin is preferably 110-165°C, more preferably 115-160°C.
- the melting point of the polypropylene-based resin can be appropriately changed according to the glass transition point (Tg) of the cyclic olefin-based resin.
- Cyclic olefin-based resins are not particularly limited, but examples thereof include ring-opening polymers (COP) of norbornene-based monomers, norbornene-based polymers (COC), vinyl alicyclic hydrocarbon polymers, and cyclic conjugated diene polymers. be done. Among these, norbornene-based polymers are preferable from the viewpoint of compatibility with polyethylene-based resins.
- Examples of commercial products of ring-opening polymers of norbornene-based monomers include ZEONOR (trade name) manufactured by Nippon Zeon Co., Ltd.
- Examples of commercially available norbornene-based polymers include APEL (trade name) manufactured by Mitsui Chemicals, Inc. and TOPAS (trade name) manufactured by Polyplastics Co., Ltd.
- the density of the cyclic olefin resin is preferably 0.99 g/cm 3 to 1.05 g/cm 3 and more preferably 1.00 g/cm 3 to 1.03 g/cm 3 . If the density is within the above range, the film formability and extrusion suitability of the adhesive resin layer 2 are improved.
- the glass transition point (Tg) of the cyclic olefin resin is preferably 60°C to 180°C, more preferably 70°C to 150°C. If the Tg is within the above range, the film formability and extrusion suitability of the adhesive resin layer 2 are improved.
- the mass ratio of the total mass of the polyethylene-based resin and polypropylene-based resin to the mass of the cyclic olefin-based resin in the adhesive resin layer 2 is 70. /30 or more, more preferably 80/20 or more, preferably 95/5 or less, more preferably 90/10 or less.
- the total mass of the polyethylene-based resin and polypropylene-based resin in the adhesive resin layer 2 and the mass of the cyclic olefin-based resin is 80% by mass or more, 90% by mass or more, or 95% by mass, based on the total amount of the adhesive resin layer 2. % by mass or more.
- the thickness of the adhesive resin layer 2 is, for example, preferably 1 to 40 ⁇ m, more preferably 10 to 40 ⁇ m, even more preferably 15 to 25 ⁇ m.
- the adhesive resin layer 2 may or may not be uniaxially stretched.
- the sealant layer 4 contains at least one of a polyethylene-based resin and a polypropylene-based resin, and a cyclic olefin-based resin.
- a polyethylene-based resin As the polyethylene-based resin, the polypropylene-based resin, and the cyclic olefin-based resin, the same ones as those exemplified for the adhesive resin layer 2 can be used.
- the mass ratio and total mass of the polyethylene-based resin, the polypropylene-based resin and the cyclic olefin-based resin in the sealant layer 4 are the same as those of the adhesive resin layer 2 .
- the thickness of the sealant layer 4 is not particularly limited, it is preferably 20 ⁇ m to 50 ⁇ m considering suitability as a packaging material and workability when laminating another film or forming a vapor deposition layer.
- sealant layer 4 components such as antifog agents, antistatic agents, heat stabilizers, nucleating agents, antioxidants, lubricants, antiblocking agents, mold release agents, ultraviolet absorbers and colorants are added as necessary. can be added as long as the object of the present disclosure is not impaired.
- the lamination method of the sealant layer 4 may be, for example, an extrusion lamination method, a T-die extrusion molding method, a co-extrusion lamination method, an inflation method, and a co-extrusion inflation method.
- the deposited layer 3a is a layer in which silicon oxide (SiO x ) is deposited. Thereby, the laminate 10 becomes excellent in water resistance.
- the thickness of the deposited layer 3a may be appropriately set according to the intended use, but is preferably 1 to 300 nm, more preferably 10 to 300 nm, and still more preferably 30 to 100 nm. When the thickness of the vapor deposition layer 3a is 1 nm or more, the continuity of the vapor deposition layer 3a can be easily made sufficient, and when the thickness is 300 nm or less, the occurrence of curling and cracking can be sufficiently suppressed, and sufficient gas barrier performance and flexibility can be obtained. easy to achieve.
- the deposited layer 3a may be a layer deposited with an inorganic oxide other than silicon oxide (SiO x ) or a metal.
- the deposited layer 3a may be obtained by, for example, depositing aluminum, or may contain aluminum oxide (AlO x ).
- Film formation means include known methods such as a vacuum deposition method, a sputtering method, and a chemical vapor deposition method (CVD method), but the vacuum deposition method is preferred because of its high film formation speed and high productivity.
- vacuum evaporation methods electron beam heating is particularly effective because the film formation rate can be easily controlled by adjusting the irradiation area and electron beam current, and the temperature of the vapor deposition material can be raised and lowered in a short period of time. be.
- Film substrate examples of materials for the film substrate 3b include polyolefin films, polyethylene terephthalate films, and nylon films.
- the film substrate 3b is preferably a polyolefin film. By using the polyolefin film, it becomes possible to recycle the adhesive resin layer 2 and the sealant layer 4 together with the olefin plastic material.
- Polyolefin films include, for example, polypropylene films and polyethylene films.
- the film substrate 3b may be a uniaxially stretched film or a biaxially stretched film.
- the lamination strength between the film base material 3b and the sealant layer 4 is preferably 1 N/15 mm or more, preferably 1.5 N/15 mm, because it is more excellent in puncture resistance. It is more preferably 2 N/15 mm or more, and more preferably 2 N/15 mm or more. Laminate strength is measured according to JIS Z-1707.
- the wettability of the surface of the film substrate 3b in contact with the polyolefin film that achieves such lamination strength may be 34 dynes or more when the lamination strength is 1 N/15 mm or more, and may be 1.5 N/15 mm or more. In some cases, it may be 36 dynes or more, and in cases of 2 N/15 mm or more, it may be 38 dynes or more. Wettability is measured according to JIS K6768:1999. The wettability of the surface of the film substrate 3b can be adjusted, for example, by subjecting the film substrate 3b to corona treatment.
- the thickness of the film substrate 3b is preferably 15 to 30 ⁇ m, more preferably 18 to 20 ⁇ m, from the viewpoint of ease of processing such as lamination.
- the material of the protective layer 5 may be polyethylene resin, for example. Since the protective layer 5 is made of polyethylene resin, the obtained container is excellent in recyclability.
- the polyethylene resin is preferably medium-density polyethylene or high-density polyethylene, since the polyethylene resin has high physical strength and the resulting container has even more excellent gas barrier properties.
- the thickness of the protective layer 5 is preferably from 10 to 30 ⁇ m, more preferably from 15 to 20 ⁇ m, since the obtained container has a more excellent gas barrier property.
- (T B ⁇ T A )/T A is preferably ⁇ 0.20 or more, more preferably ⁇ 0.10 or more, because the puncture resistance is further improved. From the same viewpoint, (T B -T A )/T A is preferably 0.25 or less, more preferably 0.10 or less, and even more preferably 0.05 or less.
- (T C -T A )/T A is preferably -0.20 or more, more preferably -0.10 or more, because the puncture resistance is further improved. From the same viewpoint, (T C -T A )/T A is preferably 0.25 or less, more preferably 0.10 or less, and even more preferably 0.05 or less.
- the tensile elastic modulus TA of the gas barrier layer 3 may be 800 MPa or more and may be 1300 MPa or less.
- T A , T B and T C are measured according to ISO 527.
- the laminate 10 is obtained by laminating each layer.
- Methods for laminating each layer include, for example, an extrusion lamination method, a T-die extrusion molding method, a co-extrusion lamination method, an inflation method, and a co-extrusion inflation method.
- the major surface of each layer may be subjected to, for example, corona treatment, plasma treatment and ozone treatment prior to lamination.
- the laminate 10 having the above configuration has excellent straw piercing properties.
- Such an effect is presumed to be produced by the following mechanism. That is, when the straw is pierced into the straw piercing opening, the impact applied from the straw is transmitted to the sealant layer while gradually attenuating as the straw penetrates the adhesive resin layer and the gas barrier layer.
- the adhesive resin layer 2 and the sealant layer 4 contain at least one of a polyethylene-based resin and a polypropylene-based resin, and a cyclic olefin-based resin, and T A , T B and T C are the above formula (1) and the formula (2) is satisfied. Therefore, the impact applied from the straw is easily transmitted to the sealant layer 4, and the adhesive resin layer 2, the gas barrier layer 3 and the sealant layer 4 are easily broken. As a result, the laminate 10 has excellent straw piercing properties.
- the laminate 10 has excellent piercing properties with a straw. Therefore, even if the material of the straw to be pierced is not plastic, which is generally used, but a material such as paper that is difficult to apply force to, the piercing can be performed satisfactorily.
- the present disclosure is not limited to the above embodiments.
- the stacking order of the film substrate 3b and the deposited layer 3a may be changed.
- the laminate strength between the film substrate 3b and the adhesive resin layer 2 may be the same as the laminate strength between the film substrate 3b and the sealant layer 4 described above.
- the vapor deposition layer 3a may not be provided.
- the adhesive resin layer 2 out of the adhesive resin layer 2 and the sealant layer 4 may contain at least one of polyethylene-based resin and polypropylene-based resin, and a cyclic olefin-based resin. In that case, the sealant layer 4 does not have to satisfy the above formula (1).
- the sealant layer 4 out of the adhesive resin layer 2 and the sealant layer 4 may contain at least one of polyethylene-based resin and polypropylene-based resin, and a cyclic olefin-based resin. In that case, the adhesive resin layer 2 does not have to satisfy the above formula (2).
- a container 50 shown in FIG. 2 is composed of the laminate 10 .
- the container 50 can fill and package various foods and drinks, chemicals such as adhesives and pressure-sensitive adhesives, cosmetics, sundries such as medicines, and various other articles. Since the container 50 has excellent piercing properties and gas barrier properties, it can be used to store dairy products such as sake and milk, juices such as fruit juice beverages, mineral water, liquid seasonings such as soy sauce and sauces, curries, stews and soups. It is particularly suitably used as a packaging container for filling and packaging liquid food and drink.
- the container 50 is a brick type container.
- the container 50 includes a rectangular parallelepiped container main body 52 having an upper portion 52a provided with a straw piercing opening 51, a side surface 52b, and a bottom portion 52c.
- the straw piercing opening 51 is a portion of the laminate 10 where the hole 1a is formed in the paper base material 1 .
- the container according to the present disclosure is not limited to the above embodiment.
- the shape of the container is not limited to the shape of the container 50, and may be, for example, a gable top type or a triangular pyramid shape.
- the shape of the container body may be cylindrical.
- Cyclic olefin resin A TOPAS 5013F-04 (trade name, norbornene polymer, tensile modulus: 2600 MPa, manufactured by Polyplastics Co., Ltd.)
- Cyclic olefin resin B ZEONOR 1020R (trade name, ring-opening polymer of norbornene-based monomer, cycloolefin polymer, tensile modulus: 2100 MPa, manufactured by Nippon Zeon Co., Ltd.)
- Cyclic olefin resin C TOPAS 6015S-04 (trade name, norbornene polymer, tensile modulus of elasticity 3000 MPa, manufactured by Polyplastic Co., Ltd.)
- Cyclic olefin resin D TOPAS 9506F-500 (trade name, norbornene polymer, tensile modulus 1800 MPa, manufactured by Polyplastic Co., Ltd.)
- the tensile elastic moduli of cyclic olefin resins and polyethylene resins are values measured according to ISO 527.
- Example 1 A laminate according to this example was obtained through the following steps. That is, as resins for forming the sealant layer and the adhesive resin layer, a polyethylene resin A and a cyclic olefin resin A were mixed by dry blending to obtain a resin mixture. The mass ratio of the polyethylene-based resin and the cyclic olefin-based resin (mass of the polyethylene-based resin/mass of the cyclic olefin-based resin) was set to 80/20.
- a gas barrier film was prepared in which a vapor deposition layer containing silica as a main component (silica vapor deposition layer, thickness: 50 nm) was formed on one surface of a film substrate (material: polypropylene resin, thickness: 18 ⁇ m).
- the surface of the film substrate opposite to the surface on which the deposited layer was formed was subjected to corona treatment so that the wettability of the surface was 40 dynes.
- a sealant layer (thickness: 30 ⁇ m) was formed on the corona-treated surface of the film substrate by extrusion lamination of the resin mixture to obtain an inner layer material.
- the wettability of the surface of the film substrate was measured according to JIS K6768:1999 using a wet tension test mixture (manufactured by Kanto Kagaku Co., Ltd.).
- a protective layer material: polyethylene-based resin, thickness: 20 ⁇ m
- a paper base material basic weight: 260 g/m 2
- An outer layer material containing a paper substrate was obtained.
- a laminated body was obtained by bonding the inner layer material and the outer layer material together with a resin mixture (adhesive resin layer) by extrusion lamination so that the vapor-deposited layer of the inner layer material and the paper base material of the outer layer material faced each other.
- the thickness of the adhesive resin layer was 15 ⁇ m.
- Example 2 A laminate was obtained in the same manner as in Example 1, except that the cyclic olefin resin B was used instead of the cyclic olefin resin A.
- Example 3 A laminate was obtained in the same manner as in Example 1, except that the cyclic olefin resin C was used instead of the cyclic olefin resin A.
- Example 4 A laminate was obtained in the same manner as in Example 1, except that the cyclic olefin resin C was used instead of the cyclic olefin resin A, and the mass ratio of the polyethylene resin and the cyclic olefin resin was set to 85/15. rice field.
- Example 5 A laminate according to this example was obtained through the following steps. That is, a resin mixture was obtained in the same manner as in Example 1, except that the polyethylene resin B was used instead of the polyethylene resin A. Next, a gas barrier film was prepared in the same manner as in Example 1 and subjected to corona treatment. A sealant layer (thickness: 30 ⁇ m) was formed by co-extrusion laminating the resin mixture and polyethylene resin A on the corona-treated surface of the film substrate to obtain an inner layer material. By coextrusion lamination, a layer of the resin mixture was formed on the corona-treated surface of the film substrate, and a layer of the polyethylene resin A was formed on the layer of the resin mixture. A laminate was obtained in the same manner as in Example 1 using the obtained inner layer material.
- Example 6 A laminate was obtained in the same manner as in Example 5, except that the mass ratio of the polyethylene resin and the cyclic olefin resin was 95/5.
- Example 7 A laminate was obtained in the same manner as in Example 1, except that polyethylene-based resin A was used instead of the resin mixture as the resin for bonding the inner layer material and the outer layer material.
- Example 1 A laminate was obtained in the same manner as in Example 1, except that the mass ratio of the polyethylene resin and the cyclic olefin resin was 97/3.
- Example 3 A laminate was obtained in the same manner as in Example 1, except that the mass ratio of the polyethylene resin and the cyclic olefin resin was 50/50.
- the lamination strength between the sealant layer and the gas barrier film was measured for the laminate obtained in each example and comparative example. The measurement was performed according to JIS Z-1707. Specifically, the laminate was cut into strips having a width of 15 mm. The sealant layer of the laminate cut into strips is measured using a Tensilon tensile tester (product name "Tensilon RTC-1250", manufactured by Orientec) so that the sealant layer and the gas barrier film face the opposite side ( That is, the film was peeled off from the gas barrier film at a peeling rate of 300 mm/min so that the peeling angle was T-shaped, and the strength required for peeling (unit: N/15 mm) was measured as the lamination strength. Table 1 shows the results.
- the puncture strength of the laminate was measured. Specifically, a needle was pierced using a tension/compression tester (manufactured by Shimadzu Corporation) from the protective layer side of the straw piercing opening of the laminate. A hemispherical needle with a hemispherical tip (diameter: 0.5 mm) was used as the needle. The needle piercing speed was 50 mm/min. The puncture strength measurement was taken as the peak value measured during needle puncture.
- the laminate obtained in each example exhibited good puncture resistance.
- the laminates obtained in Comparative Examples 1 and 2 stretched when pierced with a straw.
- the laminate obtained in Comparative Example 3 was caught when pierced with a straw.
- the gist of the present disclosure resides in the following [1] to [6].
- a paper substrate an adhesive resin layer; a gas barrier layer; a sealant layer; in this order,
- the sealant layer contains at least one of a polyethylene-based resin and a polypropylene-based resin, and a cyclic olefin-based resin,
- a gas barrier laminate wherein TA and TB satisfy the following formula (1), where TA is the tensile modulus of elasticity of the gas barrier layer and TB is the tensile modulus of elasticity of the sealant layer.
- the gas barrier layer comprises a polyolefin film as a film substrate, The sealant layer and the polyolefin film are in direct contact, The gas barrier laminate according to [1] or [2], wherein the laminate strength between the sealant layer and the polyolefin film is 1 N/15 mm or more.
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Abstract
Description
-0.26≦(TB-TA)/TA≦0.30・・・式(1)
-0.26≦(TC-TA)/TA≦0.30・・・式(2)
以下、一実施形態に係るガスバリア積層体(以下、単に「積層体」ともいう)について説明する。図1は、一実施形態に係る積層体を模式的に示す端面図である。図1に示すように、本実施形態に係る積層体10は、紙基材1と、接着性樹脂層2と、ガスバリア層3と、シーラント層4と、をこの順序で備える積層構造を有する。紙基材1には、ストロー突刺し口となる紙基材1を貫通する孔1aが形成されている。紙基材1の接着性樹脂層2と接する面とは反対の面には、保護層5が配置されている。ガスバリア層3は、蒸着層3a及びフィルム基材3bからなる。以下、積層体10の各構成について説明する。
紙基材1としては、例えば、賦型性、耐屈曲性、剛性、腰及び強度等を有する紙を用いることができる。このような紙としては、例えば、強サイズ性の晒又は未晒の紙、純白ロール紙、クラフト紙、板紙及び加工紙を用いることができる。
接着性樹脂層2は、ポリエチレン系樹脂及びポリプロピレン系樹脂のうち少なくとも一方と、環状オレフィン系樹脂とを含む。
シーラント層4は、ポリエチレン系樹脂及びポリプロピレン系樹脂のうち少なくとも一方と、環状オレフィン系樹脂とを含む。ポリエチレン系樹脂、ポリプロピレン系樹脂及び環状オレフィン系樹脂としては、接着性樹脂層2で例示したものと同様のものを用いることができる。シーラント層4における、ポリエチレン系樹脂、ポリプロピレン系樹脂及び環状オレフィン系樹脂の質量比及び合計質量は、接着性樹脂層2と同様である。
蒸着層3aは、酸化ケイ素(SiOx)を蒸着した層である。これにより、積層体10は耐水性に優れたものとなる。蒸着層3aの厚さは、使用用途によって適宜設定すればよいが、好ましくは1~300nmであり、より好ましくは10~300nmであり、更に好ましくは30~100nmである。蒸着層3aの厚さを1nm以上とすることで蒸着層3aの連続性を十分なものとしやすく、300nm以下とすることでカールやクラックの発生を十分に抑制でき、十分なガスバリア性能及び可撓性を達成しやすい。
フィルム基材3bの材料としては、例えば、ポリオレフィンフィルム、ポリエチレンテレフタレートフィルム及びナイロンフィルムが挙げられる。フィルム基材3bは、ポリオレフィンフィルムであることが好ましい。ポリオレフィンフィルムを用いることで、接着性樹脂層2及びシーラント層4と併せてオレフィン系プラスチック材料としてのリサイクルが可能となる。ポリオレフィンフィルムとしては、例えば、ポリプロピレンフィルム及びポリエチレンフィルムが挙げられる。フィルム基材3bは、1軸延伸フィルム又は2軸延伸フィルムであってもよい。
保護層5の材料は、例えばポリエチレン樹脂であってもよい。保護層5がポリエチレン樹脂であることで、得られる容器はリサイクル適性に優れる。ポリエチレン樹脂は、物理的な強度が高く、得られる容器がガスバリア性に一層優れたものとなることから、中密度ポリエチレン及び高密度ポリエチレンであることが好ましい。保護層5の厚さは、得られる容器がガスバリア性に一層優れることから、10~30μmであることが好ましく、15~20μmであることがより好ましい。
-0.26≦(TB-TA)/TA≦0.30・・・式(1)
-0.26≦(TC-TA)/TA≦0.30・・・式(2)
以下、本実施形態に係る容器(紙容器)について説明する。図2に示す容器50は、積層体10によって構成されている。
・環状オレフィン系樹脂A:TOPAS 5013F-04(商品名、ノルボルネン系重合体、引張弾性率:2600MPa、ポリプラスチック株式会社製)
・環状オレフィン系樹脂B:ZEONOR 1020R(商品名、ノルボルネン系モノマーの開環重合体、シクロオレフィンポリマー、引張弾性率:2100MPa、日本ゼオン株式会社製)
・環状オレフィン系樹脂C:TOPAS 6015S-04(商品名、ノルボルネン系重合体、引張弾性率3000MPa、ポリプラスチック株式会社製)
・環状オレフィン系樹脂D:TOPAS 9506F-500(商品名、ノルボルネン系重合体、引張弾性率1800MPa、ポリプラスチック株式会社製)
・ポリエチレン系樹脂A:LW14A(商品名、低密度ポリエチレン、引張弾性率:520MPa、東ソー株式会社製
・ポリエチレン系樹脂B:6530(商品名、高密度ポリエチレン、引張弾性率:1020MPa、東ソー株式会社製)
(実施例1)
以下の工程を経て本例に係る積層体を得た。すなわち、シーラント層及び接着性樹脂層を形成する樹脂として、ポリエチレン系樹脂Aと、環状オレフィン系樹脂Aとをドライブレンドにより混合し樹脂混合物を得た。ポリエチレン系樹脂と、環状オレフィン系樹脂との質量比(ポリエチレン系樹脂の質量/環状オレフィン系樹脂の質量)は80/20とした。
環状オレフィン系樹脂Aに代えて環状オレフィン系樹脂Bを用いたこと以外は、実施例1と同様にして積層体を得た。
環状オレフィン系樹脂Aに代えて環状オレフィン系樹脂Cを用いたこと以外は、実施例1と同様にして積層体を得た。
環状オレフィン系樹脂Aに代えて環状オレフィン系樹脂Cを用い、ポリエチレン系樹脂と、環状オレフィン系樹脂との質量比を85/15としたこと以外は、実施例1と同様にして積層体を得た。
以下の工程を経て本例に係る積層体を得た。すなわち、ポリエチレン系樹脂Aに代えてポリエチレン系樹脂Bを用いたこと以外は、実施例1と同様にして樹脂混合物を得た。次いで実施例1と同様にしてガスバリアフィルムを準備し、コロナ処理を施した。フィルム基材のコロナ処理が施されている面に樹脂混合物と、ポリエチレン系樹脂Aとを共押出ラミネートすることでシーラント層(厚さ:30μm)を形成して内層材を得た。共押出しラミネートにより、フィルム基材のコロナ処理が施されている面上に樹脂混合物からなる層が形成され、樹脂混合物からなる層の上にポリエチレン系樹脂Aからなる層が形成された。得られた内層材を用いて実施例1と同様にして積層体を得た。
ポリエチレン系樹脂と、環状オレフィン系樹脂との質量比を95/5としたこと以外は、実施例5と同様にして積層体を得た。
内層材及び外層材を貼り合わせる樹脂として、樹脂混合物に代えてポリエチレン系樹脂Aを用いたこと以外は、実施例1と同様にして積層体を得た。
ポリエチレン系樹脂と、環状オレフィン系樹脂との質量比を97/3としたこと以外は、実施例1と同様にして積層体を得た。
環状オレフィン系樹脂Aに代えて環状オレフィン系樹脂Dを用いたこと以外は、実施例1と同様にして積層体を得た。
ポリエチレン系樹脂と、環状オレフィン系樹脂との質量比を50/50としたこと以外は、実施例1と同様にして積層体を得た。
各実施例及び比較例に係る積層体のガスバリアフィルム、シーラント層及び接着性樹脂層の引張弾性率TA、TB及びTCをISO 527-3に準拠して測定した。結果を表1に示した。また、(TB-TA)/TA及び(TC-TA)/TAを算出し表1に示した。
各実施例及び比較例で得られた積層体について、シーラント層とガスバリアフィルムとのラミネート強度を測定した。測定は、JIS Z-1707に準拠して行った。具体的には、積層体を幅15mmの短冊状にカットした。短冊状にカットされた積層体のシーラント層を、テンシロン引張試験機(製品名「テンシロンRTC-1250」、オリエンテック社製)を用いて、シーラント層とガスバリアフィルムとが反対側に向かうように(すなわち剥離角度がT型になるように)、300mm/分の剥離速度でガスバリアフィルムから剥離し、剥離に要した強度(単位:N/15mm)をラミネート強度として測定した。結果を表1に示した。
各実施例及び比較例で得られた積層体の突刺し性について下記の評価1及び評価2を行った。結果を表1に示した。
積層体の突刺し強度を測定した。具体的には、積層体のストロー突刺し口の保護層側から引張圧縮試験機(島津製作所製)を用いて針を突刺した。針は、先端が半球状(直径:0.5mm)である半球針を用いた。針を突刺す速度は、50mm/分とした。突刺し強度の測定値は、針を突刺す間に測定されるピーク値とした。
プッシュプルゲージ(株式会社イマダ製、商品名:「DPX-5T」)の先端にストロー(先端角度:45°、材料:プラスチック)を取付けた。積層体のストロー突刺し口の保護層側からストローを突刺した。突刺し性は、下記の基準に基づき評価した。
4:伸び又は引っ掛かりがなく抵抗を感じない
3:伸び又は引っ掛かりがなくほとんど抵抗を感じない
2:伸び又は引っ掛かりはないが僅かに抵抗を感じる
1:伸び又は引っ掛かりがあり、抵抗を感じる
[1]紙基材と、
接着性樹脂層と、
ガスバリア層と、
シーラント層と、
をこの順序で備える積層構造を有し、
前記シーラント層が、ポリエチレン系樹脂及びポリプロピレン系樹脂のうち少なくとも一方と、環状オレフィン系樹脂とを含み、
前記ガスバリア層の引張弾性率をTAとし、前記シーラント層の引張弾性率をTBとしたとき、TA及びTBが下記式(1)を満たす、ガスバリア積層体。
-0.26≦(TB-TA)/TA≦0.30・・・式(1)
[2]紙基材と、
接着性樹脂層と、
ガスバリア層と、
シーラント層と、
をこの順序で備える積層構造を有し、
前記接着性樹脂層が、ポリエチレン系樹脂及びポリプロピレン系樹脂のうち少なくとも一方と、環状オレフィン系樹脂とを含み、
前記ガスバリア層の引張弾性率をTAとし、前記接着性樹脂層の引張弾性率をTCとしたとき、TA及びTCが下記式(2)を満たす、ガスバリア積層体。
-0.26≦(TC-TA)/TA≦0.30・・・式(2)
[3]前記ガスバリア層が、フィルム基材としてポリオレフィンフィルムを含み、
前記シーラント層と、前記ポリオレフィンフィルムとが直接接しており、
前記シーラント層と、前記ポリオレフィンフィルムとのラミネート強度が1N/15mm以上である、[1]又は[2]に記載のガスバリア積層体。
[4]前記ガスバリア層が、無機酸化物を含む蒸着層を有する、[3]に記載のガスバリア積層体。
[5][1]又は[2]に記載のガスバリア積層体によって構成されている容器。
[6]前記紙基材を貫通する孔が形成されたストロー突刺し口を備える、[5]に記載の容器。
Claims (6)
- 紙基材と、
接着性樹脂層と、
ガスバリア層と、
シーラント層と、
をこの順序で備える積層構造を有し、
前記シーラント層が、ポリエチレン系樹脂及びポリプロピレン系樹脂のうち少なくとも一方と、環状オレフィン系樹脂とを含み、
前記ガスバリア層の引張弾性率をTAとし、前記シーラント層の引張弾性率をTBとしたとき、TA及びTBが下記式(1)を満たす、ガスバリア積層体。
-0.26≦(TB-TA)/TA≦0.30・・・式(1) - 紙基材と、
接着性樹脂層と、
ガスバリア層と、
シーラント層と、
をこの順序で備える積層構造を有し、
前記接着性樹脂層が、ポリエチレン系樹脂及びポリプロピレン系樹脂のうち少なくとも一方と、環状オレフィン系樹脂とを含み、
前記ガスバリア層の引張弾性率をTAとし、前記接着性樹脂層の引張弾性率をTCとしたとき、TA及びTCが下記式(2)を満たす、ガスバリア積層体。
-0.26≦(TC-TA)/TA≦0.30・・・式(2) - 前記ガスバリア層が、フィルム基材としてポリオレフィンフィルムを含み、
前記シーラント層と、前記ポリオレフィンフィルムとが直接接しており、
前記シーラント層と、前記ポリオレフィンフィルムとのラミネート強度が1N/15mm以上である、請求項1又は2に記載のガスバリア積層体。 - 前記ガスバリア層が、無機酸化物を含む蒸着層を有する、請求項3に記載のガスバリア積層体。
- 請求項1~4のいずれか一項に記載のガスバリア積層体によって構成されている容器。
- 前記紙基材を貫通する孔が形成されたストロー突刺し口を備える、請求項5に記載の容器。
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001171649A (ja) | 1999-12-13 | 2001-06-26 | Dainippon Printing Co Ltd | 液体紙容器 |
JP2006256293A (ja) * | 2005-02-15 | 2006-09-28 | Nippon Paper-Pak Co Ltd | 液体紙容器用ポリオレフィンフィルム、それを用いた液体紙容器材料及びアセプティック液体紙容器 |
JP2008273546A (ja) * | 2007-04-26 | 2008-11-13 | Toppan Printing Co Ltd | 蓋材 |
JP2014196143A (ja) * | 2013-03-04 | 2014-10-16 | 株式会社細川洋行 | ポリスチレン容器用の易剥離蓋材 |
JP2021054078A (ja) * | 2019-09-30 | 2021-04-08 | 大日本印刷株式会社 | バリア性積層体、該バリア性積層体を備える包装容器 |
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- 2022-06-28 EP EP22858175.7A patent/EP4368390A1/en active Pending
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2001171649A (ja) | 1999-12-13 | 2001-06-26 | Dainippon Printing Co Ltd | 液体紙容器 |
JP2006256293A (ja) * | 2005-02-15 | 2006-09-28 | Nippon Paper-Pak Co Ltd | 液体紙容器用ポリオレフィンフィルム、それを用いた液体紙容器材料及びアセプティック液体紙容器 |
JP2008273546A (ja) * | 2007-04-26 | 2008-11-13 | Toppan Printing Co Ltd | 蓋材 |
JP2014196143A (ja) * | 2013-03-04 | 2014-10-16 | 株式会社細川洋行 | ポリスチレン容器用の易剥離蓋材 |
JP2021054078A (ja) * | 2019-09-30 | 2021-04-08 | 大日本印刷株式会社 | バリア性積層体、該バリア性積層体を備える包装容器 |
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