WO2022196791A1 - チューブ容器用押出成形品およびチューブ容器 - Google Patents
チューブ容器用押出成形品およびチューブ容器 Download PDFInfo
- Publication number
- WO2022196791A1 WO2022196791A1 PCT/JP2022/012494 JP2022012494W WO2022196791A1 WO 2022196791 A1 WO2022196791 A1 WO 2022196791A1 JP 2022012494 W JP2022012494 W JP 2022012494W WO 2022196791 A1 WO2022196791 A1 WO 2022196791A1
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- WIPO (PCT)
- Prior art keywords
- polyethylene resin
- derived
- density polyethylene
- layer
- resin
- Prior art date
Links
- 239000010410 layer Substances 0.000 claims abstract description 236
- 229920013716 polyethylene resin Polymers 0.000 claims abstract description 65
- 239000012790 adhesive layer Substances 0.000 claims abstract description 58
- 229920005989 resin Polymers 0.000 claims description 234
- 239000011347 resin Substances 0.000 claims description 234
- 229920001684 low density polyethylene Polymers 0.000 claims description 148
- 239000004702 low-density polyethylene Substances 0.000 claims description 148
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 132
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 132
- 239000003208 petroleum Substances 0.000 claims description 113
- 235000012438 extruded product Nutrition 0.000 claims description 70
- 238000001125 extrusion Methods 0.000 claims description 23
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims description 13
- 230000004888 barrier function Effects 0.000 claims description 7
- 241000196324 Embryophyta Species 0.000 description 100
- 239000002028 Biomass Substances 0.000 description 64
- 238000012360 testing method Methods 0.000 description 19
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- 238000000034 method Methods 0.000 description 17
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- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 10
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- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 6
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 6
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 6
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 6
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- -1 Polyethylene Polymers 0.000 description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 description 4
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- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 239000003963 antioxidant agent Substances 0.000 description 3
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 238000005304 joining Methods 0.000 description 3
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 3
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
- ZQHJVIHCDHJVII-OWOJBTEDSA-N (e)-2-chlorobut-2-enedioic acid Chemical compound OC(=O)\C=C(\Cl)C(O)=O ZQHJVIHCDHJVII-OWOJBTEDSA-N 0.000 description 2
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 2
- FGDWASZPMIGAFI-UHFFFAOYSA-N 2-but-1-enylbutanedioic acid Chemical compound CCC=CC(C(O)=O)CC(O)=O FGDWASZPMIGAFI-UHFFFAOYSA-N 0.000 description 2
- WROUWQQRXUBECT-UHFFFAOYSA-N 2-ethylacrylic acid Chemical compound CCC(=C)C(O)=O WROUWQQRXUBECT-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
- 229920003354 Modic® Polymers 0.000 description 2
- 229920003355 Novatec® Polymers 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- HNEGQIOMVPPMNR-IHWYPQMZSA-N citraconic acid Chemical compound OC(=O)C(/C)=C\C(O)=O HNEGQIOMVPPMNR-IHWYPQMZSA-N 0.000 description 2
- 229940018557 citraconic acid Drugs 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000002537 cosmetic Substances 0.000 description 2
- IFDVQVHZEKPUSC-UHFFFAOYSA-N cyclohex-3-ene-1,2-dicarboxylic acid Chemical compound OC(=O)C1CCC=CC1C(O)=O IFDVQVHZEKPUSC-UHFFFAOYSA-N 0.000 description 2
- 239000001530 fumaric acid Substances 0.000 description 2
- 238000002372 labelling Methods 0.000 description 2
- RLAWWYSOJDYHDC-BZSNNMDCSA-N lisinopril Chemical compound C([C@H](N[C@@H](CCCCN)C(=O)N1[C@@H](CCC1)C(O)=O)C(O)=O)CC1=CC=CC=C1 RLAWWYSOJDYHDC-BZSNNMDCSA-N 0.000 description 2
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 2
- 239000011976 maleic acid Substances 0.000 description 2
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000005033 polyvinylidene chloride Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- UFDHBDMSHIXOKF-UHFFFAOYSA-N tetrahydrophthalic acid Natural products OC(=O)C1=C(C(O)=O)CCCC1 UFDHBDMSHIXOKF-UHFFFAOYSA-N 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 239000000606 toothpaste Substances 0.000 description 2
- 229940034610 toothpaste Drugs 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000007740 vapor deposition Methods 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 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000817 Petroleum-derived resin Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
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- 239000006096 absorbing agent Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 239000003484 crystal nucleating agent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
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- 239000000945 filler Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000008269 hand cream Substances 0.000 description 1
- 229920001519 homopolymer Polymers 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
- B32B1/00—Layered products having a non-planar shape
- B32B1/08—Tubular products
-
- 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
-
- 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
- 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
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
- B65D35/00—Pliable tubular containers adapted to be permanently or temporarily deformed to expel contents, e.g. collapsible tubes for toothpaste or other plastic or semi-liquid material; Holders therefor
- B65D35/02—Body construction
- B65D35/10—Body construction made by uniting or interconnecting two or more components
-
- 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
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
-
- 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
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
-
- 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
- B32B2323/00—Polyalkenes
- B32B2323/04—Polyethylene
- B32B2323/046—LDPE, i.e. low density polyethylene
-
- 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
- B32B2439/00—Containers; Receptacles
- B32B2439/40—Closed containers
-
- 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
- B32B2597/00—Tubular articles, e.g. hoses, pipes
Definitions
- the present invention relates to an extrusion molded product for a tube container and a tube container.
- a laminated tube is known as a tube container for storing toothpaste, cosmetics, and the like.
- Laminated tubes are manufactured using laminated sheets obtained by laminating polyethylene resin, special paper, aluminum foil, etc., as raw materials.
- a laminate tube is manufactured by rolling a laminate sheet into a cylindrical shape, overlapping both ends of the sheet, welding the overlapped portions, and joining a cap fitting portion to the resulting container body.
- Such laminated tubes have, for example, the following problems. Since the laminate tube is manufactured by overlapping both ends, a step is generated in the overlapped portion, which poses a problem in terms of appearance. Since the end face of the laminate sheet is exposed at the overlapped portion, the contained contents permeate into the inside of the laminate through the end face, and the physical properties of the laminate sheet are deteriorated. In addition, it is difficult to increase the wall thickness of the laminated tube because it includes a process of rolling it into a cylindrical shape, and because it is desirable to make the above-described step inconspicuous, and it is difficult to maintain sufficient strength with a tube having a large diameter.
- Patent Documents 1 and 2 Tube containers manufactured by extrusion are called extruded tubes.
- An extruded tube is manufactured by continuously extruding a molten resin into a tubular shape with an extruder, cutting it into an appropriate length, and joining a cap fitting portion to the resulting container body.
- a multilayer extruded tube is manufactured by extruding multiple types of melted resins into a single mold using separate extruders to form a tube shape with a multilayer structure in the mold.
- an object of the present invention is to provide a technique related to an extruded tube containing a plant-derived polyethylene resin and having excellent stress crack resistance, seal strength, and surface smoothness.
- the present invention has a tubular shape as a whole and has a five-layer structure in which an innermost layer, a first adhesive layer, an intermediate layer, a second adhesive layer, and an outermost layer are laminated in order, and An extruded product for a tube container is provided, wherein each of the innermost layer and the outermost layer contains a plant-derived polyethylene resin.
- a container body comprising the above-described extrudate sealed at one end; and a cap fitting portion joined to the other end of the extrudate with the one end sealed.
- Extruded product for tube containers has a tubular shape as a whole and has a five-layer structure in which an innermost layer, a first adhesive layer, an intermediate layer, a second adhesive layer, and an outermost layer are laminated in order. and each of the innermost layer and the outermost layer contains a plant-derived polyethylene resin.
- tube container extrusions are simply referred to as "extrusions”.
- FIG. 1 is a cross-sectional view showing a five-layer structure of an extruded article according to one embodiment of the present invention.
- the extruded product 1 has a five-layer structure in which an innermost layer 1a, a first adhesive layer 1b, an intermediate layer 1c, a second adhesive layer 1d, and an outermost layer 1e are laminated in this order.
- the extruded product 1 shown in FIG. 1 is used as a container body of a tube container, the surface on the innermost layer 1a side is adjacent to the inner space of the tube container, and the surface on the outermost layer 1e side is the outer space of the tube container. Adjacent to.
- the extruded product 1 may be cylindrical or elliptical.
- the extrudate 1 has a circumference of, for example, 30-190 mm.
- the extrudate 1 preferably has a circumference of 40-160 mm.
- the circumference refers to the length of the outer circumference of the tubular extruded product 1 .
- the extruded product 1 has a thickness of, for example, 0.19-0.55 mm, preferably 0.24-0.5 mm.
- the thickness refers to the thickness of the wall of the tubular extruded article 1, and is the average value of the thicknesses measured at three locations set at approximately equal intervals along the longitudinal direction of the extruded article 1.
- the innermost layer 1a has a thickness of, for example, 0.12-0.25 mm, preferably 0.14-0.24 mm.
- the first adhesive layer 1b has a thickness of, for example, 0.001-0.03 mm, preferably 0.005-0.02 mm.
- the intermediate layer 1c has a thickness of, for example, 0.01-0.1 mm, preferably 0.02-0.08 mm.
- the second adhesive layer 1d has a thickness of, for example, 0.001-0.03 mm, preferably 0.005-0.02 mm.
- the outermost layer 1e has a thickness of, for example, 0.06-0.2 mm, preferably 0.08-0.18 mm.
- the extruded product 1 can have any length, and may have a length longer than the container body of the tube container, or may have the same length as the container body of the tube container. . In the former case, the extruded product 1 is used as the container body of the tube container after being cut to the length of the container body of the tube container.
- the innermost layer 1a contains a plant-derived polyethylene resin.
- the innermost layer 1a contains low density polyethylene (LDPE) and linear low density polyethylene (L-LDPE), and the low density polyethylene (LDPE) and at least one of the linear low-density polyethylene resin (L-LDPE) is derived from plants.
- LDPE low density polyethylene
- L-LDPE linear low density polyethylene
- the innermost layer 1a is It may contain a plant-derived low-density polyethylene resin (biomass LDPE) and a plant-derived linear low-density polyethylene resin (biomass L-LDPE), It may contain a plant-derived low-density polyethylene resin (biomass LDPE) and a petroleum-derived linear low-density polyethylene resin (petroleum L-LDPE), It may contain petroleum-derived low-density polyethylene resin (petroleum LDPE) and plant-derived linear low-density polyethylene resin (biomass L-LDPE).
- Low-density polyethylene resin (LDPE) and linear low-density polyethylene resin (L-LDPE) are structurally different due to differences in manufacturing methods. That is, low-density polyethylene resin (LDPE) is an ethylene polymer and has a structure in which ethylene is randomly branched and bonded. Thus, low-density polyethylene resins (LDPE) have side chains of various carbon numbers attached to the main chain, and the side chains include short chain branches (e.g., short chain branches of about 20 carbon atoms or less). and long chain branches (eg, long chain branches greater than about 20 carbon atoms). On the other hand, linear low-density polyethylene resin (L-LDPE) is a copolymer of ethylene and ⁇ -olefin.
- linear low density polyethylene resin has no long chain branches (e.g., long chain branches greater than about 20 carbon atoms) attached to the main chain, and short chain Only branches (eg, short chain branches of about 20 carbon atoms or less) are attached.
- the innermost layer 1a contains a plant-derived low-density polyethylene resin (biomass LDPE) and a plant-derived linear low-density polyethylene resin (biomass L-LDPE).
- biomass LDPE plant-derived low-density polyethylene resin
- biomass L-LDPE plant-derived linear low-density polyethylene resin
- the innermost layer 1a contains a plant-derived low-density polyethylene resin (biomass LDPE) and a petroleum-derived linear low-density polyethylene resin (petroleum L-LDPE).
- biomass LDPE plant-derived low-density polyethylene resin
- petroleum L-LDPE petroleum-derived linear low-density polyethylene resin
- the innermost layer 1a contains a petroleum-derived low-density polyethylene resin (petroleum LDPE) and a plant-derived linear low-density polyethylene resin (biomass L-LDPE).
- a petroleum-derived low-density polyethylene resin petroleum LDPE
- a plant-derived linear low-density polyethylene resin biomass L-LDPE
- the innermost layer 1a can contain low-density polyethylene resin (LDPE) and linear low-density polyethylene resin (L-LDPE) at a mass ratio of, for example, 9:1 to 1:9.
- LDPE low-density polyethylene resin
- L-LDPE linear low-density polyethylene resin
- the innermost layer 1a comprises a plant-derived low-density polyethylene resin (biomass LDPE) and a plant-derived linear low-density polyethylene resin (biomass L-LDPE) at a ratio of 9:1 to 4:6, for example. preferably in a mass ratio of 8:2 to 4:6, more preferably in a mass ratio of 7:3 to 4:6, even more preferably in a mass ratio of 6:4 to 4:6.
- biomass LDPE plant-derived low-density polyethylene resin
- biomass L-LDPE plant-derived linear low-density polyethylene resin
- the innermost layer 1a is composed of a plant-derived low-density polyethylene resin (biomass LDPE) and a petroleum-derived linear low-density polyethylene resin (petroleum L-LDPE) at a ratio of 9:1 to 4:6, for example. preferably in a mass ratio of 9:1 to 5:5, more preferably in a mass ratio of 9:1 to 6:4, more preferably in a mass ratio of 9:1 to 7:3.
- biomass LDPE plant-derived low-density polyethylene resin
- petroleum L-LDPE petroleum-derived linear low-density polyethylene resin
- the innermost layer 1a is composed of petroleum-derived low-density polyethylene resin (petroleum LDPE) and plant-derived linear low-density polyethylene resin (biomass L-LDPE) at a ratio of 6:4 to 1:9, for example. preferably in a mass ratio of 5:5 to 1:9, more preferably in a mass ratio of 4:6 to 1:9, even more preferably in a mass ratio of 4:6 to 2:8.
- petroleum-derived low-density polyethylene resin petroleum LDPE
- biomass L-LDPE plant-derived linear low-density polyethylene resin
- biomass LDPE plant-derived low-density polyethylene resin
- biomass L-LDPE plant-derived linear low-density polyethylene resin
- biomass L-LDPE plant-derived low-density polyethylene resin
- petroleum-derived low-density polyethylene resin petroleum LDPE
- a petroleum-derived linear low-density polyethylene resin petroleum L-LDPE
- Plant-derived low-density polyethylene resin (biomass LDPE)”
- Plant-derived low-density polyethylene resin (biomass LDPE)”
- a “plant-derived low-density polyethylene resin (biomass LDPE)” is, for example, a sugarcane-derived low-density polyethylene resin.
- Sugarcane-derived low-density polyethylene resin is an ethylene polymer produced using sugarcane as a raw material, and has a structure in which ethylene is randomly branched and bonded.
- the density of the “plant-derived low-density polyethylene resin (biomass LDPE)” is preferably in the range of 0.91 g/cm 3 to 0.93 g/cm 3 , more preferably 0.915 g/cm 3 to 0.93 g/cm 3 . It is more preferably in the range of cm 3 .
- the density of the resin described in this specification is a measured value obtained by a method based on JIS K7112:1999.
- melt flow rate (MFR) of "plant-derived low-density polyethylene resin (biomass LDPE)" is preferably in the range of 0.1 g / 10 minutes to 10 g / 10 minutes, 1 g / 10 minutes to 5 g /10 minutes is more preferable.
- the melt flow rate (MFR) of the resin described in this specification is a measured value obtained by a method conforming to JIS K7210:1999. Specifically, the melt flow rate is a measured value of the weight of resin extruded in 10 minutes when a load of 21.18 N is applied to the resin at 190°C.
- Plant-derived low-density polyethylene resin can use, for example, plant-derived low-density polyethylene sold by Braskem, examples of which include SEB853, SBC818, SBF0323HC, STN7006, and SPB618. and resins sold under the trade name of
- Plant-derived linear low-density polyethylene resin (biomass L-LDPE)” “Plant-derived linear low-density polyethylene resin (biomass L-LDPE)” is a copolymer of ethylene and ⁇ -olefin produced using plants as raw materials.
- a “plant-derived linear low-density polyethylene resin (biomass L-LDPE)” is, for example, a sugarcane-derived linear low-density polyethylene resin.
- Sugarcane-derived linear low-density polyethylene resin is a copolymer of ethylene and ⁇ -olefin produced using sugarcane as a starting material.
- ⁇ -olefin is at least one compound selected from the group consisting of ⁇ -olefins having 3 to 20 carbon atoms, such as 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene and the like.
- the density of the “plant-derived linear low-density polyethylene resin (biomass L-LDPE)” is preferably in the range of 0.91 g/cm 3 to 0.93 g/cm 3 , and preferably 0.915 g/cm 3 . It is more preferably in the range of ⁇ 0.93 g/cm 3 .
- the melt flow rate (MFR) of the "plant-derived linear low-density polyethylene resin (biomass L-LDPE)” is preferably in the range of 0.1 g / 10 minutes to 10 g / 10 minutes, and 1 g /10 min to 5 g/10 min.
- Plant-derived linear low-density polyethylene resin (biomass L-LDPE)
- biomass L-LDPE plant-derived linear low-density polyethylene sold by Braskem.
- SLL118/21, SLL218, SLL218/21, SLL318, SLH118, SLH218, SLH0820/30AF plant-derived linear low-density polyethylene sold by Braskem.
- Petroleum-derived low-density polyethylene resin (petroleum LDPE)
- Petroleum-derived low-density polyethylene resin (petroleum LDPE)
- Petroleum LDPE is an ethylene polymer produced using petroleum as a raw material, and has a structure in which ethylene is randomly branched and bonded.
- the density of the “petroleum-derived low-density polyethylene resin (petroleum LDPE)” is preferably in the range of 0.91 g/cm 3 to 0.93 g/cm 3 , more preferably 0.915 g/cm 3 to 0.93 g/cm 3 . It is more preferably in the range of cm 3 .
- the melt flow rate (MFR) of "petroleum-derived low-density polyethylene resin (petroleum LDPE)” is preferably in the range of 0.1 g/10 minutes to 10 g/10 minutes, and 1 g/10 minutes to 5 g /10 minutes is more preferable.
- Petroleum-derived low-density polyethylene resin (petroleum LDPE)" can be a commercially available petroleum-derived low-density polyethylene resin, an example of which is sold by Mitsui Dow Polychemical Co., Ltd. under the trade name Mirason. resin sold by Japan Polyethylene Co., Ltd. under the trade name of Novatec resin sold by Tosoh Corporation under the trade name of Petrothene resin sold by ENEOS NUC Co., Ltd. under the trade name of NUC is mentioned.
- Petroleum L-LDPE “Petroleum-derived linear low-density polyethylene resin (petroleum L-LDPE)” “Petroleum-derived linear low-density polyethylene resin (petroleum L-LDPE)” is a copolymer of ethylene and ⁇ -olefin produced using petroleum as a raw material.
- ⁇ -olefin is at least one compound selected from the group consisting of ⁇ -olefins having 3 to 20 carbon atoms, such as 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene and the like.
- the density of the “petroleum-derived linear low-density polyethylene resin (petroleum L-LDPE)” is preferably in the range of 0.91 g/cm 3 to 0.93 g/cm 3 , and preferably 0.915 g/cm 3 . It is more preferably in the range of ⁇ 0.93 g/cm 3 .
- the melt flow rate (MFR) of the "petroleum-derived linear low-density polyethylene resin (petroleum L-LDPE)” is preferably in the range of 0.1 g/10 minutes to 10 g/10 minutes, and 1 g /10 min to 5 g/10 min.
- “Petroleum-derived linear low-density polyethylene resin (petroleum L-LDPE)” can be a commercially available petroleum-derived linear low-density polyethylene resin. Resins sold under the trade name of Neo-Zex or Ulto-Zex, and resins sold under the trade name of Novatec by Nippon Polyethylene Co., Ltd. can be mentioned.
- the first adhesive layer 1b serves to bond the innermost layer 1a to the intermediate layer 1c.
- the first adhesive layer 1b contains, for example, an acid-modified polyethylene resin.
- the "acid-modified polyethylene resin” is preferably maleic anhydride-modified polyethylene resin.
- the first adhesive layer 1b typically contains a petroleum-derived acid-modified polyethylene resin.
- "Petroleum-derived acid-modified polyethylene resin” is a resin obtained by modifying petroleum-derived polyethylene with an unsaturated carboxylic acid or its anhydride. Such resins are known as adhesive resins because they are imparted with adhesiveness by acid modification. Examples of unsaturated carboxylic acids or their anhydrides include acrylic acid, methacrylic acid, ⁇ -ethylacrylic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, tetrahydrophthalic acid, chloromaleic acid, butenylsuccinic acid, and these Anhydrides of
- the "petroleum-derived acid-modified polyethylene resin” is preferably a petroleum-derived maleic anhydride-modified polyethylene resin. More preferably, the "petroleum-derived acid-modified polyethylene resin” is a petroleum-derived maleic anhydride-modified low-density polyethylene resin (MA-modified LDPE), a petroleum-derived maleic anhydride-modified linear low-density polyethylene resin (MA-modified L -LDPE), or mixtures thereof.
- MA-modified LDPE petroleum-derived maleic anhydride-modified low-density polyethylene resin
- MA-modified L -LDPE petroleum-derived maleic anhydride-modified linear low-density polyethylene resin
- Polyethylene resin (MA-modified LDPE) is a resin obtained by modifying an ethylene homopolymer produced using petroleum as a raw material with maleic anhydride.
- the density of the “petroleum-derived maleic anhydride-modified low-density polyethylene resin (MA-modified LDPE)” is preferably in the range of 0.91 g/cm 3 to 0.93 g/cm 3 , and preferably 0.915 g/cm 3 . It is more preferably in the range of ⁇ 0.93 g/cm 3 .
- the resin density described in this specification is a measured value obtained by a method conforming to JIS K7112:1999.
- melt flow rate (MFR) of the "petroleum-derived maleic anhydride-modified low-density polyethylene resin (MA-modified LDPE)" is preferably in the range of 0.1 g/10 minutes to 10 g/10 minutes, and 1 g /10 min to 5 g/10 min.
- the melt flow rate (MFR) of the resin described in this specification is a measured value obtained by a method conforming to JIS K7210:1999. Specifically, the melt flow rate is a measured value of the weight of resin extruded in 10 minutes when a load of 21.18 N is applied to the resin at 190°C.
- Polyethylene resin (MA-modified LDPE)
- MA-modified low-density polyethylene resin is, for example, a resin sold by Mitsubishi Chemical Corporation under the trade name "Modic” (registered trademark), Mitsui Chemicals, Inc. " A resin sold under the trade name of "ADMER” (registered trademark) can be used.
- “Petroleum-derived maleic anhydride-modified linear low-density polyethylene resin (MA-modified L-LDPE)” is a copolymer of ethylene and ⁇ -olefin, produced using petroleum as a raw material, with maleic anhydride. It is a resin obtained by modification.
- " ⁇ -olefin” is at least one compound selected from the group consisting of ⁇ -olefins having 3 to 20 carbon atoms, such as 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene and the like.
- the density of the “petroleum-derived maleic anhydride-modified linear low-density polyethylene resin (MA-modified L-LDPE)” is preferably in the range of 0.91 g/cm 3 to 0.93 g/cm 3 , More preferably, it is in the range of 0.915 g/cm 3 to 0.93 g/cm 3 .
- the melt flow rate (MFR) of "petroleum-derived maleic anhydride-modified linear low-density polyethylene resin (MA-modified L-LDPE)” is in the range of 0.1 g/10 minutes to 10 g/10 minutes. more preferably in the range of 1 g/10 minutes to 5 g/10 minutes.
- Polyethylene resin (MA-modified L-LDPE)
- ADMER registered trademark
- MODIC registered trademark
- OREVAC registered trademark
- the intermediate layer 1c preferably contains a gas barrier resin.
- a known resin having gas barrier properties can be used as the resin constituting the intermediate layer 1c.
- the resin constituting the intermediate layer 1c is, for example, ethylene-vinyl alcohol copolymer resin (EVOH), nylon (NY), polyvinyl alcohol (PVA), polyacrylonitrile (PAN), polyvinylidene chloride (PVDC), preferably is an ethylene-vinyl alcohol copolymer resin (EVOH).
- Ethylene-vinyl alcohol copolymer resin is, for example, a resin sold under the trade name of "Soarnol” (registered trademark) by Mitsubishi Chemical Corporation, and a product of "Eval” (registered trademark) by Kuraray Co., Ltd. It is possible to use resins sold under the same name.
- the second adhesive layer 1d serves to bond the outermost layer 1e to the intermediate layer 1c.
- the second adhesive layer 1d contains, for example, an acid-modified polyethylene resin.
- the "acid-modified polyethylene resin” is preferably maleic anhydride-modified polyethylene resin.
- the second adhesive layer 1d typically contains an acid-modified polyethylene resin derived from petroleum.
- the "petroleum-derived acid-modified polyethylene resin” is preferably a petroleum-derived maleic anhydride-modified polyethylene resin. More preferably, the "petroleum-derived acid-modified polyethylene resin” is a petroleum-derived maleic anhydride-modified low-density polyethylene resin (MA-modified LDPE), a petroleum-derived maleic anhydride-modified linear low-density polyethylene resin (MA-modified L -LDPE), or mixtures thereof.
- MA-modified LDPE petroleum-derived maleic anhydride-modified low-density polyethylene resin
- MA-modified L -LDPE petroleum-derived maleic anhydride-modified linear low-density polyethylene resin
- the "petroleum-derived acid-modified polyethylene resin" contained in the second adhesive layer 1d is the same as the "petroleum-derived acid-modified polyethylene resin" described for the first adhesive layer 1b, and the description thereof can be referred to.
- the second adhesive layer 1d may have the same resin composition as the first adhesive layer 1b, or may have a different resin composition from the first adhesive layer 1b.
- the outermost layer 1e contains a plant-derived polyethylene resin.
- the outermost layer 1e contains low density polyethylene resin (LDPE) and linear low density polyethylene resin (L-LDPE), and low density polyethylene resin (LDPE) and linear low density polyethylene resin ( L-LDPE) are derived from plants.
- the outermost layer 1e is It may contain a plant-derived low-density polyethylene resin (biomass LDPE) and a plant-derived linear low-density polyethylene resin (biomass L-LDPE), It may contain a plant-derived low-density polyethylene resin (biomass LDPE) and a petroleum-derived linear low-density polyethylene resin (petroleum L-LDPE), It may contain petroleum-derived low-density polyethylene resin (petroleum LDPE) and plant-derived linear low-density polyethylene resin (biomass L-LDPE).
- the outermost layer 1e contains a plant-derived low-density polyethylene resin (biomass LDPE) and a plant-derived linear low-density polyethylene resin (biomass L-LDPE).
- biomass LDPE plant-derived low-density polyethylene resin
- biomass L-LDPE plant-derived linear low-density polyethylene resin
- the outermost layer 1e includes a plant-derived low-density polyethylene resin (biomass LDPE) and a petroleum-derived linear low-density polyethylene resin (petroleum L-LDPE).
- biomass LDPE plant-derived low-density polyethylene resin
- petroleum L-LDPE petroleum-derived linear low-density polyethylene resin
- the outermost layer 1e includes petroleum-derived low-density polyethylene resin (petroleum LDPE) and plant-derived linear low-density polyethylene resin (biomass L-LDPE).
- petroleum LDPE petroleum-derived low-density polyethylene resin
- biomass L-LDPE plant-derived linear low-density polyethylene resin
- the outermost layer 1e can contain low-density polyethylene resin (LDPE) and linear low-density polyethylene resin (L-LDPE) at a mass ratio of, for example, 9:1 to 1:9.
- LDPE low-density polyethylene resin
- L-LDPE linear low-density polyethylene resin
- the outermost layer 1e is composed of a plant-derived low-density polyethylene resin (biomass LDPE) and a plant-derived linear low-density polyethylene resin (biomass L-LDPE) at a ratio of 9:1 to 4:6, for example. preferably in a mass ratio of 8:2 to 4:6, more preferably in a mass ratio of 7:3 to 4:6, even more preferably in a mass ratio of 6:4 to 4:6.
- biomass LDPE plant-derived low-density polyethylene resin
- biomass L-LDPE plant-derived linear low-density polyethylene resin
- the outermost layer 1e is composed of a plant-derived low-density polyethylene resin (biomass LDPE) and a petroleum-derived linear low-density polyethylene resin (petroleum L-LDPE) at a ratio of 9:1 to 4:6, for example. preferably in a mass ratio of 9:1 to 5:5, more preferably in a mass ratio of 9:1 to 6:4, more preferably in a mass ratio of 9:1 to 7:3.
- biomass LDPE plant-derived low-density polyethylene resin
- petroleum L-LDPE petroleum-derived linear low-density polyethylene resin
- the outermost layer 1e is composed of petroleum-derived low-density polyethylene resin (petroleum LDPE) and plant-derived linear low-density polyethylene resin (biomass L-LDPE), for example, 6:4 to 1:9. preferably in a mass ratio of 5:5 to 1:9, more preferably in a mass ratio of 4:6 to 1:9, even more preferably in a mass ratio of 4:6 to 2:8.
- petroleum-derived low-density polyethylene resin petroleum LDPE
- biomass L-LDPE plant-derived linear low-density polyethylene resin
- Resins contained in the outermost layer 1e that is, "plant-derived low-density polyethylene resin (biomass LDPE)", “plant-derived linear low-density polyethylene resin (biomass L-LDPE)", “petroleum-derived low-density polyethylene
- the resin (petroleum LDPE)” and the “petroleum-derived linear low-density polyethylene resin (petroleum L-LDPE)” are the same as those described for the innermost layer 1a, and reference can be made to those descriptions.
- the outermost layer 1e may have the same resin composition as the innermost layer 1a, or may have a different resin composition from the innermost layer 1a.
- the innermost layer 1a, the first adhesive layer 1b, the intermediate layer 1c, the second adhesive layer 1d, and the outermost layer 1e are mainly composed of a resin, and in addition to the resin, they contain known additives as necessary. You may have as additives, various additives known as additives for resins can be used. Additives include, for example, antioxidants, ultraviolet absorbers, weathering agents, antistatic agents, fillers, crystal nucleating agents, coloring pigments, delustering agents, coloring inhibitors, antifogging agents, flame retardants, and antiblocking agents. , lubricants (including slip agents and release agents), and CO2 absorbents. The total content of additives can be, for example, 0.01 to 10 parts by mass with respect to 100 parts by mass of the resin in each layer.
- the five-layer extrudate 1 described above contains a polyethylene resin of plant origin, for example in an amount of more than 40% by weight.
- the extruded product 1 contains a plant-derived polyethylene resin in an amount of preferably 50% by mass or more, more preferably 60% by mass or more, and even more preferably 70% by mass or more. That is, the ratio of the plant-derived polyethylene resin contained in the extruded product 1 (that is, the biomass degree) is, for example, greater than 40% by mass, preferably 50% by mass or more, more preferably 60% by mass or more, and still more preferably 70% by mass. % by mass or more.
- the upper limit of the ratio of the plant-derived polyethylene resin contained in the extruded product 1 (that is, the degree of biomass) is, for example, 85% by mass.
- the extruded product 1 can be manufactured according to a known co-extrusion method. That is, the resin constituting the innermost layer 1a, the resin constituting the first adhesive layer 1b, the resin constituting the intermediate layer 1c, the resin constituting the second adhesive layer 1d, and the resin constituting the outermost layer 1e are extruded separately. It can be manufactured by extruding into a single mold with a machine and forming a five-layer tubular shape in the mold.
- extruded product refers to a product formed to have a tubular shape by extrusion.
- extrusion refers to something that has a tubular shape immediately after extrusion.
- extrusion does not encompass extruded sheets that are rolled into tubes.
- the extrudate 1 may comprise one or more additional layers on top of the extrudate 1 .
- a molded tube container comprising an extruded article and one or more layers provided on the extruded article. This tube container molded article is simply referred to as a "molded article" in the following description.
- Additional layers may be applied to the extrudate according to known decorating techniques, for example by printing, painting (e.g. clear coating to protect the surface of the printed layer), labeling, hot stamping, shrink filming, vapor deposition, or film transfer. can be formed on.
- the additional layer may be one layer or multiple layers, for example 1-5 layers.
- Tube container is a container body comprising the above-described extrudate sealed at one end; a cap fitting portion joined to the other end of the extrusion molded at the one end sealed.
- the tube container is a container body including the molded article described above with one end sealed; a cap fitting portion joined to the other end of the molded product with the one end sealed.
- FIG. 2 is a plan view showing the configuration of a tube container according to one embodiment of the present invention.
- the tube container 10 includes a container body 11 and a cap fitting portion 12 joined to the container body 11 .
- the tube container 10 is used by filling the container body 11 with contents and fitting the cap to the cap fitting portion 12 .
- the content may be a highly viscous liquid or a semi-solid.
- the contents are, for example, face wash, cosmetics, toothpaste, daily necessities such as hand cream, and foods such as jam and butter.
- the container body 11 is obtained by sealing one end of the extruded product 1 described above. Sealing can be performed by a known method for end sealing of a tube container, for example, a heat sealing method, an ultrasonic sealing method, or a hot air sealing method. As mentioned above, the extrusion 1 may be provided with one or more additional layers on its outer surface prior to sealing one end. That is, the container body 11 is formed by, for example, printing, painting (e.g., clear coating for protecting the surface of the printed layer), labeling, hot stamping, shrink film application, vapor deposition, or film transfer, according to known decoration techniques. One or more additional layers may also be included.
- the container body 11 includes a body portion 21 and a seal portion 22 provided at one end of the body portion 21, as shown in FIG.
- the body 21 is the extrusion 1 or the unsealed part of the molding.
- the end portion of the body portion 21 where the seal portion 22 is not provided has a circular or elliptical cylindrical shape when viewed through the opening.
- the seal portion 22 is a portion formed by thermally welding one end of the extruded product 1 or the molded product.
- the seal portion 22 has a flat shape, and the inner surfaces facing each other are sealed.
- the seal portion 22 closes one end of the container body 11 .
- a cap fitting portion 12 is provided at the end of the trunk portion 21 opposite to the end provided with the seal portion 22 .
- the cap fitting portion 12 includes a shoulder portion 31 that is integrally continuous with the end portion of the body portion 21 where the seal portion 22 is not provided, and a cylindrical mouth portion 32 that is provided in the center of the shoulder portion 31.
- the cap fitting portion 12 is manufactured by injection molding or compression molding separately from the body portion 21 and is joined to the body portion 21 . In the case of injection molding, the formation of the cap fitting portion 12 and the joining of the cap fitting portion 12 to the container body 11 may be performed simultaneously by insert molding, or the cap fitting portion 12 may be formed as a separate component. After injection molding, it may be joined to the container body 11 by ultrasonic welding.
- the shoulder portion 31 has an outer surface facing the outer space of the tube container 10 and an inner surface facing the inner space of the tube container 10 each having a truncated cone shape that tapers from the inner space toward the outer space. .
- An outer peripheral edge of the shoulder portion 31 is continuous with the body portion 21 .
- the mouth portion 32 is provided at the center of the shoulder portion 31 so as to protrude outward.
- the extruded product, molded product, and tube container of the present invention are five layers in which the innermost layer 1a, the first adhesive layer 1b, the intermediate layer 1c, the second adhesive layer 1d, and the outermost layer 1e are laminated in order.
- Each of the innermost layer 1a and the outermost layer 1e contains a plant-derived polyethylene resin.
- an extruded tube containing a plant-derived polyethylene resin is provided with an adhesive layer as an independent layer to form a five-layer structure, thereby providing excellent stress crack resistance, excellent sealing strength, and excellent surface properties. Smoothness can be achieved.
- each of the innermost layer 1a and the outermost layer 1e contain low density polyethylene resin (LDPE) and linear and low density polyethylene resins (L-LDPE), at least one of which is of plant origin.
- LDPE low density polyethylene resin
- L-LDPE linear and low density polyethylene resins
- the extruded product, molded product and tube container of the present invention have the following advantages. Since the extruded product, the molded product and the tube container of the present invention contain the plant-derived polyethylene resin, they can contribute to the reduction of CO 2 emissions compared to the petroleum-derived polyethylene resin. In addition, since the extruded product, molded product, and tube container of the present invention are produced by extrusion molding, they do not have overlapped portions (that is, seams) that are seen in laminated tubes, and can achieve a seamless appearance. can. In addition, since the extruded product, molded product, and tube container of the present invention are manufactured by extrusion molding, they are easier to thicken than laminated tubes, and maintain sufficient strength even in tube containers with a large diameter. be able to.
- the extruded product, molded product and tube container of the present invention have the following advantages because they have the five-layer structure described above.
- Two methods of providing an adhesive layer containing an adhesive resin between layers are conceivable.
- the first adhesive layer 1b and the second adhesive layer 1d are provided as independent layers to form a five-layer structure. No need to embed. Therefore, in the present invention, the proportion of the plant-derived polyethylene resin contained in the innermost layer 1a and the outermost layer 1e can be increased up to 100% by mass, thereby increasing the biomass content of the extruded product. .
- the first adhesive layer 1b and the second adhesive layer 1d are provided as independent layers to form a five-layer structure.
- the adhesive resin is not diluted like Therefore, in the present invention, the amount of adhesive resin used can be reduced.
- Adhesive resin has a special chemical structure to exhibit adhesiveness and is a relatively expensive material. Therefore, if the amount of adhesive resin used is reduced, cost can be reduced.
- Preferred Embodiments are collectively described below.
- It has a tubular shape as a whole and has a five-layer structure in which an innermost layer, a first adhesive layer, an intermediate layer, a second adhesive layer, and an outermost layer are laminated in order, and the innermost layer and the outermost layer Extrusions for tube containers, each comprising a plant-derived polyethylene resin.
- Each of the innermost layer and the outermost layer contains a low-density polyethylene resin and a linear low-density polyethylene resin, and at least one of the low-density polyethylene resin and the linear low-density polyethylene resin is derived from a plant.
- each of the innermost layer and the outermost layer contains a plant-derived low-density polyethylene resin and a plant-derived linear low-density polyethylene resin.
- each of the innermost layer and the outermost layer contains a plant-derived low-density polyethylene resin and a petroleum-derived linear low-density polyethylene resin.
- each of the innermost layer and the outermost layer comprises a petroleum-derived low-density polyethylene resin and a plant-derived linear low-density polyethylene resin.
- Each of the innermost layer and the outermost layer contains the low density polyethylene resin and the linear low density polyethylene resin at a mass ratio of 9:1 to 1:9 [2] to [5] The extruded product according to any one of 1.
- Each of the innermost layer and the outermost layer preferably contains the plant-derived low-density polyethylene resin and the plant-derived linear low-density polyethylene resin at a mass ratio of 9:1 to 4:6. is in a weight ratio of 8:2 to 4:6, more preferably in a weight ratio of 7:3 to 4:6, more preferably in a weight ratio of 6:4 to 4:6. Molding.
- Each of the innermost layer and the outermost layer preferably contains the plant-derived low-density polyethylene resin and the petroleum-derived linear low-density polyethylene resin at a mass ratio of 9:1 to 4:6. is in a weight ratio of 9:1 to 5:5, more preferably in a weight ratio of 9:1 to 6:4, more preferably in a weight ratio of 9:1 to 7:3. Molding.
- Each of the innermost layer and the outermost layer preferably contains the petroleum-derived low-density polyethylene resin and the plant-derived linear low-density polyethylene resin at a mass ratio of 6:4 to 1:9. is in a weight ratio of 5:5 to 1:9, more preferably in a weight ratio of 4:6 to 1:9, more preferably in a weight ratio of 4:6 to 2:8. Molding.
- the plant-derived low-density polyethylene resin has a density of 0.91 g/cm 3 to 0.93 g/cm 3 , preferably 0.915 g/cm 3 to 0.93 g/cm 3 [3] or The extruded product according to [7].
- the plant-derived low density polyethylene resin has a melt flow rate of 0.1 g/10 min to 10 g/10 min, preferably 1 g/10 min to 5 g/10 min [3], [7] or The extruded article according to [10].
- the plant-derived linear low-density polyethylene resin has a density of 0.91 g/cm 3 to 0.93 g/cm 3 , preferably 0.915 g/cm 3 to 0.93 g/cm 3 [ 3], [7], [10] or the extruded article according to [11].
- the plant-derived linear low-density polyethylene resin has a melt flow rate of 0.1 g/10 min to 10 g/10 min, preferably 1 g/10 min to 5 g/10 min [3], [ 7], [10], [11] or the extruded article according to [12].
- the plant-derived low-density polyethylene resin has a density of 0.91 g/cm 3 to 0.93 g/cm 3 , preferably 0.915 g/cm 3 to 0.93 g/cm 3 [4] or [8]
- the plant-derived low density polyethylene resin has a melt flow rate of 0.1 g/10 min to 10 g/10 min, preferably 1 g/10 min to 5 g/10 min [4], [8] or The extruded article according to [14].
- the petroleum-derived linear low-density polyethylene resin has a density of 0.91 g/cm 3 to 0.93 g/cm 3 , preferably 0.915 g/cm 3 to 0.93 g/cm 3 [ 4], [8], [14] or the extruded article according to [15].
- the petroleum-derived linear low-density polyethylene resin has a melt flow rate of 0.1 g/10 min to 10 g/10 min, preferably 1 g/10 min to 5 g/10 min [4], [ 8], [14], [15] or the extruded article according to [16].
- said petroleum-derived low density polyethylene resin has a density of 0.91 g/cm 3 to 0.93 g/cm 3 , preferably 0.915 g/cm 3 to 0.93 g/cm 3 [5] or [9] The extruded product according to [9].
- said petroleum-derived low density polyethylene resin has a melt flow rate of 0.1 g/10 min to 10 g/10 min, preferably 1 g/10 min to 5 g/10 min [5], [9] or The extruded article according to [18].
- the plant-derived linear low-density polyethylene resin has a density of 0.91 g/cm 3 to 0.93 g/cm 3 , preferably 0.915 g/cm 3 to 0.93 g/cm 3 [ 5], [9], [18] or the extruded article according to [19].
- the plant-derived linear low-density polyethylene resin has a melt flow rate of 0.1 g/10 min to 10 g/10 min, preferably 1 g/10 min to 5 g/10 min [5], [ 9], [18], [19] or the extruded article according to [20].
- the extruded product of [1] to [24] contains a plant-derived polyethylene resin in an amount of 50 to 85% by mass, preferably 60 to 85% by mass, more preferably 70 to 85% by mass. 2.
- each of the first adhesive layer and the second adhesive layer contains an acid-modified polyethylene resin.
- the acid-modified polyethylene resin is a polyethylene resin modified with an unsaturated carboxylic acid or its anhydride.
- the unsaturated carboxylic acid or its anhydride is acrylic acid, methacrylic acid, ⁇ -ethylacrylic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, tetrahydrophthalic acid, chloromaleic acid, butenylsuccinic acid, and
- the acid-modified polyethylene resin is a petroleum-derived maleic anhydride-modified low-density polyethylene resin, a petroleum-derived maleic anhydride-modified linear low-density polyethylene resin, or a mixture thereof [26]-[30] The extruded product according to any one of 1.
- the maleic anhydride-modified low-density polyethylene resin has a density of 0.91 g/cm 3 to 0.93 g/cm 3 , preferably 0.915 g/cm 3 to 0.93 g/cm 3 , and the maleic anhydride modified linear low density polyethylene resin having a density of 0.91 g/cm 3 to 0.93 g/cm 3 , preferably 0.915 g/cm 3 to 0.93 g/cm 3 in [31] Extrusion as described.
- the maleic anhydride-modified low-density polyethylene resin has a melt flow rate of 0.1 g/10 minutes to 10 g/10 minutes, preferably 1 g/10 minutes to 5 g/10 minutes, and the maleic anhydride-modified low-density polyethylene resin Extrusion according to [31] or [32], wherein the linear low density polyethylene resin has a melt flow rate of 0.1 g/10 min to 10 g/10 min, preferably 1 g/10 min to 5 g/10 min.
- the first adhesive layer has a thickness of 0.001 to 0.03 mm, preferably 0.005 to 0.02 mm
- the second adhesive layer has a thickness of 0.001 to 0.03 mm, preferably The extruded product according to any one of [1] to [41], having a thickness of 0.005 to 0.02 mm.
- [43] The extruded product according to any one of [1] to [42]; and one or more layers provided on said extrusion.
- a container body comprising the extruded product according to any one of [1] to [42], one end of which is sealed; and a cap fitting portion joined to the other end of the extruded product, the one end of which is sealed.
- a container body comprising the molded article of [43] with one end sealed; and a cap fitting portion joined to the other end of the molded product, the one end of which is sealed.
- Resin A petroleum-derived low-density polyethylene (density: 0.92 g/cm 3 , MFR: 1.9 g/10 min (190°C, 21.18 N load)) (hereinafter referred to as "petroleum LDPE”);
- Resin B plant-derived low-density polyethylene (density: 0.923 g/cm 3 , MFR: 2.7 g/10 min (190° C., 21.18 N load)) (hereinafter referred to as “biomass LDPE”);
- Resin C plant-derived linear low-density polyethylene (density: 0.916 g/cm 3 , MFR: 2.3 g/10 min (190° C., 21.18 N load)) (hereinafter referred to as “biomass L-LDPE-1”);
- Resin D Petroleum-derived maleic anhydride-modified low-density polyethylene (density: 0.93 g/cm 3 , MFR: 1.0
- Petroleum-derived maleic anhydride-modified low-density polyethylene (density: 0.93 g/cm 3 , MFR: 1.0 g/10 min (210°C, 21.18 N load)) as the adhesive resin for the first and second adhesive layers prepared.
- An ethylene-vinyl alcohol copolymer (density: 1.14 g/cm 3 , MFR: 12.0 g/10 min (210° C., 21.18 N load)) was prepared as a resin for the intermediate layer (barrier layer).
- the resulting tube (that is, extruded product) had a circumference of 157 mm, a length of 180 mm, and an average wall thickness of 0.46 mm.
- the thicknesses of the innermost layer, the first adhesive layer, the intermediate layer, the second adhesive layer and the outermost layer were 0.225 mm, 0.01 mm, 0.04 mm, 0.01 mm and 0.175 mm, respectively.
- Example 2 A tube having a 5-layer structure was produced in the same manner as in Example 1, except that "biomass LDPE" was used as the resin constituting the innermost layer and the outermost layer.
- Example 3 A tube having a five-layer structure was produced in the same manner as in Example 1, except that "Biomass L-LDPE-1" was used as the resin constituting the innermost layer and the outermost layer.
- Example 4 produced a tube having a three-layer structure. Dry-blending "MA-modified LDPE-1", “MA-modified LDPE-2” and “Biomass L-LDPE-2” at a mass ratio of 50:20:30 as resins constituting the innermost layer and the outermost layer. A mixed resin obtained by was used. A mixture was obtained by adding 0.1 parts by mass of an antioxidant and 2.5 parts by mass of titanium oxide as a coloring pigment to 100 parts by mass of the mixed resin. Two hoppers of a single-screw tube extruder were charged with pellets of the above mixture and pellets of ethylene-vinyl alcohol copolymer, respectively. The temperature of the extruder and die is set to 170-200°C, and the molding conditions are a production speed of 60 pieces/min and a take-up speed of 10.8m/min. A tube was molded.
- the resulting tube (that is, extruded product) had a circumference of 157 mm, a length of 180 mm, and an average wall thickness of 0.46 mm.
- the thicknesses of the innermost layer, intermediate layer and outermost layer were 0.225 mm, 0.06 mm and 0.175 mm, respectively.
- Example 5 As the resin constituting the innermost layer and the outermost layer, except for using a mixed resin obtained by dry blending "biomass LDPE” and “biomass L-LDPE-1" at a mass ratio of 50:50, Example A tube having a five-layer structure was manufactured in the same manner as in Example 1.
- Example 6 As the resin constituting the innermost layer and the outermost layer, a mixed resin obtained by dry blending "biomass LDPE” and “petroleum L-LDPE” at a mass ratio of 85:15 was used. A tube having a five-layer structure was produced in a similar manner.
- Example 7 As the resin constituting the innermost layer and the outermost layer, except for using a mixed resin obtained by dry blending "biomass LDPE” and “biomass L-LDPE-1" at a mass ratio of 70:30, Example A tube having a five-layer structure was manufactured in the same manner as in Example 1.
- Example 8 As the resin constituting the innermost layer and the outermost layer, a mixed resin obtained by dry blending "biomass LDPE” and “petroleum L-LDPE” at a mass ratio of 70:30 was used. A tube having a five-layer structure was produced in a similar manner.
- Example 9 As the resin constituting the innermost layer and the outermost layer, a mixed resin obtained by dry blending "petroleum LDPE” and “biomass L-LDPE-1" at a mass ratio of 30:70 was used. A tube having a five-layer structure was manufactured in the same manner as in Example 1.
- Biomass degree (%) ⁇ (total mass of plant-derived polyethylene resin) / (total mass of all resins constituting extruded product) ⁇ x 100
- the tube of Example 1 has a five-layer structure of innermost layer/first adhesive layer/intermediate layer/second adhesive layer/outermost layer, and each of the innermost layer and the outermost layer is made of petroleum-derived polyethylene resin. Does not contain derived polyethylene resin.
- the tube of Example 1 showed good results in all stress crack resistance tests, ultrasonic seal strength tests, and surface roughening tests.
- the tubes of Examples 2 and 3 have a 5-layer structure similar to that of Example 1, and each of the innermost layer and the outermost layer is composed of a plant-derived polyethylene resin. Compared with the tube of Example 1, the tube of Example 2 was more likely to cause stress cracks and tended to have lower seal strength, but both were at a practically acceptable level. In addition, the tube of Example 3 was slightly roughened on the surface as compared with the tube of Example 1, but the level was practically acceptable.
- each of the innermost layer and the outermost layer is composed of a plant-derived polyethylene resin and an adhesive resin, and has a three-layer structure of innermost layer/intermediate layer/outermost layer.
- the tube of Example 4 showed good results in all stress crack resistance tests, ultrasonic seal strength tests, and surface roughening tests.
- the tube of Example 4 incorporates the adhesive resin into the innermost layer and the outermost layer, the adhesive resin is diluted and a large amount of the adhesive resin is used. Therefore, the tube of Example 4 has a lower biomass content than the five-layer tubes (Examples 2, 3, 5 to 8).
- the tubes of Examples 5 and 7 have a five-layer structure similar to that of Example 1, and each of the innermost layer and the outermost layer is composed of a plant-derived low-density polyethylene resin and a plant-derived linear low-density polyethylene resin. Configured. Both the tubes of Examples 5 and 7 showed good results in all of the stress crack resistance test, ultrasonic seal strength test, and surface roughening test.
- the tubes of Examples 6 and 8 have a five-layer structure similar to that of Example 1, and each of the innermost and outermost layers is composed of a plant-derived low-density polyethylene resin and a petroleum-derived linear low-density polyethylene resin. Configured. Both the tubes of Examples 6 and 8 showed good results in all of the stress crack resistance test, ultrasonic seal strength test, and surface roughening test.
- the tube of Example 9 has a five-layer structure similar to that of Example 1, and each of the innermost layer and the outermost layer is composed of a petroleum-derived low-density polyethylene resin and a plant-derived linear low-density polyethylene resin. .
- the tube of Example 9 showed good results in all stress crack resistance tests, ultrasonic seal strength tests, and surface roughening tests.
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Abstract
Description
一端がシールされた上述の押出成形品を含む容器本体と、
前記一端がシールされた前記押出成形品の他端に接合されたキャップ嵌合部分と
を備えたチューブ容器が提供される。
チューブ容器用押出成形品は、全体としてチューブ形状を有し、最内層、第1接着層、中間層、第2接着層、および最外層が順に積層された5層構造を有し、前記最内層および前記最外層の各々が、植物由来のポリエチレン樹脂を含む。以下の説明において、チューブ容器用押出成形品は、単に「押出成形品」という。
バイオマス度(%)={(植物由来のポリエチレン樹脂の合計質量)/(押出成形品を構成する全樹脂の合計質量)}×100
押出成形品は、全体としてチューブ形状を有し、最内層、第1接着層、中間層、第2接着層、および最外層が順に積層された5層構造を有する。図1は、本発明の一実施形態に係る押出成形品の5層構造を示す断面図である。図1に示すように、押出成形品1は、最内層1a、第1接着層1b、中間層1c、第2接着層1d、および最外層1eが、この順に積層された5層構造を有する。図1に示される押出成形品1は、チューブ容器の容器本体として使用されると、最内層1a側の面がチューブ容器の内部空間と隣接し、最外層1e側の面がチューブ容器の外部空間と隣接する。
以下、最内層1a、第1接着層1b、中間層1c、第2接着層1d、最外層1eを構成する樹脂について、順に説明する。
最内層1aは、植物由来のポリエチレン樹脂を含む。好ましい実施形態において、最内層1aは、低密度ポリエチレン樹脂(Low Density Polyethylene:LDPE)と直鎖状低密度ポリエチレン樹脂(Linear Low Density Polyethylene:L-LDPE)とを含み、低密度ポリエチレン樹脂(LDPE)および直鎖状低密度ポリエチレン樹脂(L-LDPE)の少なくとも一方が植物由来である。
植物由来の低密度ポリエチレン樹脂(バイオマスLDPE)と、植物由来の直鎖状低密度ポリエチレン樹脂(バイオマスL-LDPE)とを含んでいてもよいし、
植物由来の低密度ポリエチレン樹脂(バイオマスLDPE)と、石油由来の直鎖状低密度ポリエチレン樹脂(石油L-LDPE)とを含んでいてもよいし、
石油由来の低密度ポリエチレン樹脂(石油LDPE)と、植物由来の直鎖状低密度ポリエチレン樹脂(バイオマスL-LDPE)とを含んでいてもよい。
「植物由来の低密度ポリエチレン樹脂(バイオマスLDPE)」は、植物を原料として用いて製造した、エチレンの重合体であり、エチレンがランダムに分岐して結合した構造を有する。「植物由来の低密度ポリエチレン樹脂(バイオマスLDPE)」は、例えば、サトウキビ由来の低密度ポリエチレン樹脂である。サトウキビ由来の低密度ポリエチレン樹脂は、サトウキビを原料として用いて製造した、エチレンの重合体であり、エチレンがランダムに分岐して結合した構造を有する。
「植物由来の直鎖状低密度ポリエチレン樹脂(バイオマスL-LDPE)」は、植物を原料として用いて製造した、エチレンとα-オレフィンとの共重合体である。「植物由来の直鎖状低密度ポリエチレン樹脂(バイオマスL-LDPE)」は、例えば、サトウキビ由来の直鎖状低密度ポリエチレン樹脂である。サトウキビ由来の直鎖状低密度ポリエチレン樹脂は、サトウキビを原料として用いて製造した、エチレンとα-オレフィンとの共重合体である。
「石油由来の低密度ポリエチレン樹脂(石油LDPE)」は、石油を原料として用いて製造した、エチレンの重合体であり、エチレンがランダムに分岐して結合した構造を有する。
「石油由来の直鎖状低密度ポリエチレン樹脂(石油L-LDPE)」は、石油を原料として用いて製造した、エチレンとα-オレフィンとの共重合体である。
第1接着層1bは、最内層1aを中間層1cと接着する役割を果たす。第1接着層1bは、例えば、酸変性ポリエチレン樹脂を含む。「酸変性ポリエチレン樹脂」は、好ましくは、無水マレイン酸変性ポリエチレン樹脂である。
中間層1cは、好ましくは、ガスバリア性を有する樹脂を含む。中間層1cを構成する樹脂は、ガスバリア性を有する樹脂として公知の樹脂を使用することができる。中間層1cを構成する樹脂は、例えば、エチレン-ビニルアルコール共重合体樹脂(EVOH)、ナイロン(NY)、ポリビニルアルコール(PVA)、ポリアクリロニトリル(PAN)、ポリ塩化ビニリデン(PVDC)であり、好ましくはエチレン-ビニルアルコール共重合体樹脂(EVOH)である。
第2接着層1dは、最外層1eを中間層1cと接着する役割を果たす。第2接着層1dは、例えば、酸変性ポリエチレン樹脂を含む。「酸変性ポリエチレン樹脂」は、好ましくは、無水マレイン酸変性ポリエチレン樹脂である。
最外層1eは、植物由来のポリエチレン樹脂を含む。好ましい実施形態において、最外層1eは、低密度ポリエチレン樹脂(LDPE)と直鎖状低密度ポリエチレン樹脂(L-LDPE)とを含み、低密度ポリエチレン樹脂(LDPE)および直鎖状低密度ポリエチレン樹脂(L-LDPE)の少なくとも一方が植物由来である。
植物由来の低密度ポリエチレン樹脂(バイオマスLDPE)と、植物由来の直鎖状低密度ポリエチレン樹脂(バイオマスL-LDPE)とを含んでいてもよいし、
植物由来の低密度ポリエチレン樹脂(バイオマスLDPE)と、石油由来の直鎖状低密度ポリエチレン樹脂(石油L-LDPE)とを含んでいてもよいし、
石油由来の低密度ポリエチレン樹脂(石油LDPE)と、植物由来の直鎖状低密度ポリエチレン樹脂(バイオマスL-LDPE)とを含んでいてもよい。
最内層1a、第1接着層1b、中間層1c、第2接着層1d、最外層1eは、樹脂を主成分として構成されるが、樹脂に加えて、必要に応じて公知の添加剤を含有していてもよい。添加剤としては、樹脂用添加剤として知られている種々の添加剤を使用することができる。添加剤としては、例えば、酸化防止剤、紫外線吸収剤、耐候剤、帯電防止剤、充填剤、結晶核剤、着色顔料、艶消し剤、着色防止剤、防曇剤、難燃剤、アンチブロッキング剤、滑剤(スリップ剤、離型剤を含む)、およびCO2吸収剤などが挙げられる。添加剤の総含有量は、各層の樹脂100質量部に対して、例えば0.01~10質量部とすることができる。
上述の5つの層を有する押出成形品1は、植物由来のポリエチレン樹脂を、例えば40質量%を超える量で含む。押出成形品1は、植物由来のポリエチレン樹脂を、好ましくは50質量%以上、より好ましくは60質量%以上、更に好ましくは70質量%以上の量で含む。すなわち、押出成形品1に含まれる植物由来のポリエチレン樹脂の割合(すなわち、バイオマス度)は、例えば40質量%より大きく、好ましくは50質量%以上、より好ましくは60質量%以上、更に好ましくは70質量%以上である。
押出成形品1は、公知の共押出成形法に従って製造することができる。すなわち、最内層1aを構成する樹脂、第1接着層1bを構成する樹脂、中間層1cを構成する樹脂、第2接着層1dを構成する樹脂、最外層1eを構成する樹脂を、別々の押出機で1つの金型へ押し出して、金型内で5層構造のチューブ形状を形成することにより製造することができる。
押出成形品1は、押出成形品1の上に、1以上の追加の層を備えていてもよい。すなわち、別の側面によれば、押出成形品と、前記押出成形品の上に設けられた1以上の層とを備えた、チューブ容器用成形品が提供される。このチューブ容器用成形品は、以下の説明において、単に「成形品」という。
チューブ容器は、
一端がシールされた上述の押出成形品を含む容器本体と、
前記一端がシールされた前記押出成形品の他端に接合されたキャップ嵌合部分と
を備えている。
一端がシールされた上述の成形品を含む容器本体と、
前記一端がシールされた前記成形品の他端に接合されたキャップ嵌合部分と
を備えている。
上述のとおり、本発明の押出成形品、成形品およびチューブ容器は、最内層1a、第1接着層1b、中間層1c、第2接着層1d、および最外層1eが順に積層された5層構造を有し、最内層1aおよび最外層1eの各々に、植物由来のポリエチレン樹脂を含む。本発明では、植物由来のポリエチレン樹脂を配合した押出成形チューブを、接着層を独立した層として設けて5層構造とすることにより、優れた耐ストレスクラック性、優れたシール強度、および優れた表面平滑性を達成することができる。
以下に、好ましい態様をまとめて記載する。
[1] 全体としてチューブ形状を有し、最内層、第1接着層、中間層、第2接着層、および最外層が順に積層された5層構造を有し、前記最内層および前記最外層の各々が、植物由来のポリエチレン樹脂を含む、チューブ容器用押出成形品。
[2] 前記最内層および前記最外層の各々が、低密度ポリエチレン樹脂と直鎖状低密度ポリエチレン樹脂とを含み、前記低密度ポリエチレン樹脂および前記直鎖状低密度ポリエチレン樹脂の少なくとも一方が植物由来である、[1]に記載の押出成形品。
[3] 前記最内層および前記最外層の各々が、植物由来の低密度ポリエチレン樹脂と、植物由来の直鎖状低密度ポリエチレン樹脂とを含む[2]に記載の押出成形品。
[4] 前記最内層および前記最外層の各々が、植物由来の低密度ポリエチレン樹脂と、石油由来の直鎖状低密度ポリエチレン樹脂とを含む[2]に記載の押出成形品。
[5] 前記最内層および前記最外層の各々が、石油由来の低密度ポリエチレン樹脂と、植物由来の直鎖状低密度ポリエチレン樹脂とを含む[2]に記載の押出成形品。
[7] 前記最内層および前記最外層の各々が、前記植物由来の低密度ポリエチレン樹脂と前記植物由来の直鎖状低密度ポリエチレン樹脂とを、9:1~4:6の質量比で、好ましくは8:2~4:6の質量比で、より好ましくは7:3~4:6の質量比で、更に好ましくは6:4~4:6の質量比で含む[3]に記載の押出成形品。
[8] 前記最内層および前記最外層の各々が、前記植物由来の低密度ポリエチレン樹脂と前記石油由来の直鎖状低密度ポリエチレン樹脂とを、9:1~4:6の質量比で、好ましくは9:1~5:5の質量比で、より好ましくは9:1~6:4の質量比で、更に好ましくは9:1~7:3の質量比で含む[4]に記載の押出成形品。
[9] 前記最内層および前記最外層の各々が、前記石油由来の低密度ポリエチレン樹脂と前記植物由来の直鎖状低密度ポリエチレン樹脂とを、6:4~1:9の質量比で、好ましくは5:5~1:9の質量比で、より好ましくは4:6~1:9の質量比で、更に好ましくは4:6~2:8の質量比で含む[5]に記載の押出成形品。
[11] 前記植物由来の低密度ポリエチレン樹脂が、0.1g/10分~10g/10分、好ましくは1g/10分~5g/10分のメルトフローレートを有する[3]、[7]または[10]に記載の押出成形品。
[12] 前記植物由来の直鎖状低密度ポリエチレン樹脂が、0.91g/cm3~0.93g/cm3、好ましくは0.915g/cm3~0.93g/cm3の密度を有する[3]、[7]、[10]または[11]に記載の押出成形品。
[13] 前記植物由来の直鎖状低密度ポリエチレン樹脂が、0.1g/10分~10g/10分、好ましくは1g/10分~5g/10分のメルトフローレートを有する[3]、[7]、[10]、[11]または[12]に記載の押出成形品。
[15] 前記植物由来の低密度ポリエチレン樹脂が、0.1g/10分~10g/10分、好ましくは1g/10分~5g/10分のメルトフローレートを有する[4]、[8]または[14]に記載の押出成形品。
[16] 前記石油由来の直鎖状低密度ポリエチレン樹脂が、0.91g/cm3~0.93g/cm3、好ましくは0.915g/cm3~0.93g/cm3の密度を有する[4]、[8]、[14]または[15]に記載の押出成形品。
[17] 前記石油由来の直鎖状低密度ポリエチレン樹脂が、0.1g/10分~10g/10分、好ましくは1g/10分~5g/10分のメルトフローレートを有する[4]、[8]、[14]、[15]または[16]に記載の押出成形品。
[19] 前記石油由来の低密度ポリエチレン樹脂が、0.1g/10分~10g/10分、好ましくは1g/10分~5g/10分のメルトフローレートを有する[5]、[9]または[18]に記載の押出成形品。
[20] 前記植物由来の直鎖状低密度ポリエチレン樹脂が、0.91g/cm3~0.93g/cm3、好ましくは0.915g/cm3~0.93g/cm3の密度を有する[5]、[9]、[18]または[19]に記載の押出成形品。
[21] 前記植物由来の直鎖状低密度ポリエチレン樹脂が、0.1g/10分~10g/10分、好ましくは1g/10分~5g/10分のメルトフローレートを有する[5]、[9]、[18]、[19]または[20]に記載の押出成形品。
[23] 前記押出成形品が、植物由来のポリエチレン樹脂を40質量%を超える量で含む[1]~[22]の何れか1に記載の押出成形品。
[24] 前記押出成形品が、植物由来のポリエチレン樹脂を、50質量%以上、好ましくは60質量%以上、より好ましくは70質量%以上の量で含む[1]~[23]の何れか1に記載の押出成形品。
[25] 前記押出成形品が、植物由来のポリエチレン樹脂を、50~85質量%、好ましくは60~85質量%、より好ましくは70~85質量%の量で含む[1]~[24]の何れか1に記載の押出成形品。
[27] 前記酸変性ポリエチレン樹脂が、不飽和カルボン酸またはその無水物で変性されたポリエチレン樹脂である[26]に記載の押出成形品。
[28] 前記不飽和カルボン酸またはその無水物が、アクリル酸、メタクリル酸、α-エチルアクリル酸、マレイン酸、フマル酸、イタコン酸、シトラコン酸、テトラヒドロフタル酸、クロロマレイン酸、ブテニルコハク酸、およびこれらの無水物からなる群より選択される[27]に記載の押出成形品。
[29] 前記酸変性ポリエチレン樹脂が、無水マレイン酸変性ポリエチレン樹脂である[26]~[28]の何れか1に記載の押出成形品。
[31] 前記酸変性ポリエチレン樹脂が、石油由来の無水マレイン酸変性低密度ポリエチレン樹脂、石油由来の無水マレイン酸変性直鎖状低密度ポリエチレン樹脂、またはこれらの混合物である[26]~[30]の何れか1に記載の押出成形品。
[32] 前記無水マレイン酸変性低密度ポリエチレン樹脂が、0.91g/cm3~0.93g/cm3、好ましくは0.915g/cm3~0.93g/cm3の密度を有し、前記無水マレイン酸変性直鎖状低密度ポリエチレン樹脂が、0.91g/cm3~0.93g/cm3、好ましくは0.915g/cm3~0.93g/cm3の密度を有する[31]に記載の押出成形品。
[33] 前記無水マレイン酸変性低密度ポリエチレン樹脂が、0.1g/10分~10g/10分、好ましくは1g/10分~5g/10分のメルトフローレートを有し、前記無水マレイン酸変性直鎖状低密度ポリエチレン樹脂が、0.1g/10分~10g/10分、好ましくは1g/10分~5g/10分のメルトフローレートを有する[31]または[32]に記載の押出成形品。
[35] 前記樹脂が、エチレン-ビニルアルコール共重合体樹脂(EVOH)、ナイロン(NY)、ポリビニルアルコール(PVA)、ポリアクリロニトリル(PAN)、またはポリ塩化ビニリデン(PVDC)である[34]に記載の押出成形品。
[36] 前記樹脂が、エチレン-ビニルアルコール共重合体樹脂である[34]または[35]に記載の押出成形品。
[37] 前記押出成形品が、円筒形状または楕円筒形状を有する[1]~[36]の何れか1に記載の押出成形品。
[39] 前記押出成形品が、0.19~0.55mm、好ましくは0.24~0.5mmの厚みを有する[1]~[38]の何れか1に記載の押出成形品。
[40] 前記最内層が、0.12~0.25mm、好ましくは0.14~0.24mmの厚みを有し、前記最外層が、0.06~0.2mm、好ましくは0.08~0.18mmの厚みを有する[1]~[39]の何れか1に記載の押出成形品。
[41] 前記中間層が、0.01~0.1mm、好ましくは0.02~0.08mmの厚みを有する[1]~[40]の何れか1に記載の押出成形品。
[42] 前記第1接着層が、0.001~0.03mm、好ましくは0.005~0.02mmの厚みを有し、前記第2接着層が、0.001~0.03mm、好ましくは0.005~0.02mmの厚みを有する[1]~[41]の何れか1に記載の押出成形品。
前記押出成形品の上に設けられた1以上の層と
を備えた、チューブ容器用成形品。
[44] 一端がシールされた[1]~[42]の何れか1に記載の押出成形品を含む容器本体と、
前記一端がシールされた前記押出成形品の他端に接合されたキャップ嵌合部分と
を備えたチューブ容器。
[45] 一端がシールされた[43]に記載の成形品を含む容器本体と、
前記一端がシールされた前記成形品の他端に接合されたキャップ嵌合部分と
を備えたチューブ容器。
[1-1]押出成形品の製造
最内層および最外層用の樹脂として、以下の樹脂A~Gを準備した。
樹脂B:植物由来の低密度ポリエチレン(密度:0.923g/cm3、MFR:2.7g/10min(190℃、21.18N荷重))(以下「バイオマスLDPE」と呼ぶ);
樹脂C:植物由来の直鎖状低密度ポリエチレン(密度:0.916g/cm3、MFR:2.3g/10min(190℃、21.18N荷重))(以下「バイオマスL-LDPE-1」と呼ぶ);
樹脂D:石油由来の無水マレイン酸変性低密度ポリエチレン(密度:0.93g/cm3、MFR:1.0g/10min(190℃、21.18N荷重))(以下「MA変性LDPE-1」と呼ぶ);
樹脂E:石油由来の無水マレイン酸変性低密度ポリエチレン(密度:0.92g/cm3、MFR:1.5g/10min(190℃、21.18N荷重))(以下「MA変性LDPE-2」と呼ぶ);
樹脂F:植物由来の直鎖状低密度ポリエチレン(密度:0.916g/cm3、MFR:1.0g/10min(190℃、21.18N荷重))(以下「バイオマスL-LDPE-2」と呼ぶ);
樹脂G:石油由来の直鎖状低密度ポリエチレン(密度:0.925g/cm3、MFR:1.9g/10min(190℃、21.18N荷重))(以下、「石油L-LDPE」と呼ぶ)。
最内層および最外層を構成する樹脂として、「石油LDPE」を使用した。「石油LDPE」100質量部に対し、酸化防止剤0.1質量部、着色顔料として酸化チタン2.5質量部を添加して、混合物を得た。1軸チューブ押出機の3つのホッパーに、それぞれ上記混合物のペレット、接着性樹脂のペレット、およびエチレン-ビニルアルコール共重合体のペレットを投入した。押出機およびダイの設定温度を170~200℃に設定し、60本/minの生産速度および10.8m/minの引取速度という成形条件で、最内層/第1接着層/中間層/第2接着層/最外層の5層構造を有するチューブを成形した。
最内層および最外層を構成する樹脂として、「バイオマスLDPE」を用いた以外は、例1と同様の方法で、5層構造を有するチューブを製造した。
最内層および最外層を構成する樹脂として、「バイオマスL-LDPE-1」を用いた以外は、例1と同様の方法で、5層構造を有するチューブを製造した。
例4では、3層構造を有するチューブを製造した。最内層および最外層を構成する樹脂として、「MA変性LDPE-1」と「MA変性LDPE-2」と「バイオマスL-LDPE-2」とを50:20:30の質量比でドライブレンドすることにより得られた混合樹脂を使用した。混合樹脂100質量部に対し、酸化防止剤0.1質量部、着色顔料として酸化チタン2.5質量部を添加して、混合物を得た。1軸チューブ押出機の2つのホッパーに、それぞれ上記混合物のペレットおよびエチレン-ビニルアルコール共重合体のペレットを投入した。押出機およびダイの設定温度を170~200℃に設定し、60本/minの生産速度および10.8m/minの引取速度という成形条件で、最内層/中間層/最外層の3層構造を有するチューブを成形した。
最内層および最外層を構成する樹脂として、「バイオマスLDPE」と「バイオマスL-LDPE-1」とを50:50の質量比でドライブレンドすることにより得られた混合樹脂を用いた以外は、例1と同様の方法で、5層構造を有するチューブを製造した。
最内層および最外層を構成する樹脂として、「バイオマスLDPE」と「石油L-LDPE」とを85:15の質量比でドライブレンドすることにより得られた混合樹脂を用いた以外は、例1と同様の方法で、5層構造を有するチューブを製造した。
最内層および最外層を構成する樹脂として、「バイオマスLDPE」と「バイオマスL-LDPE-1」とを70:30の質量比でドライブレンドすることにより得られた混合樹脂を用いた以外は、例1と同様の方法で、5層構造を有するチューブを製造した。
最内層および最外層を構成する樹脂として、「バイオマスLDPE」と「石油L-LDPE」とを70:30の質量比でドライブレンドすることにより得られた混合樹脂を用いた以外は、例1と同様の方法で、5層構造を有するチューブを製造した。
最内層および最外層を構成する樹脂として、「石油LDPE」と「バイオマスL-LDPE-1」とを30:70の質量比でドライブレンドすることにより得られた混合樹脂を用いた以外は、例1と同様の方法で、5層構造を有するチューブを製造した。
例1~9のチューブの物性を、下記の方法により評価した。
得られたチューブの一端をヒートシールしたのち、エンド部から5cmの部分を切り取り試験片とした。この試験片を10% Igepal(ポリ(オキシエチレン)ノニルフェニルエーテル)水溶液へ浸漬し、65℃恒温槽にて所定時間にわたって保管した。保管後、亀裂の有無を目視で判定した。
・評価基準
〇 :24時間保管後に亀裂なし
△ :6時間保管後に微小な亀裂が見られる
× :6時間保管後に大きい亀裂が見られる(内容物の漏えいに至る)
超音波シール機(ブランソン製TS-2、パワーサプライ2000X)を用いて、振幅90%、溶着時間:200msecのシール条件でサンプルをシール後、以下に記載の方法で評価を行った。シール後のサンプルを、15mm幅の短冊状に切り試験片とした。試験片のシール部を180°に開き、引張試験機(島津製作所製、商品名AUTOGRAPH AGS-X)のつかみに取り付けた。引張速度50mm/minでT型引張試験を行い、安定値を超音波シール強度[N]とした。
・評価基準
〇 :35 N以上
△ :23 N以上、35 N未満
× :23 N未満
得られたチューブの表面の荒れ状態を目視で確認した。
・評価基準
〇 :荒れなし
△ :僅かな荒れあり
× :目立った荒れあり
得られたチューブに含まれる植物由来のポリエチレン樹脂の割合(%)、すなわち「バイオマス度」を以下の式により算出した。
バイオマス度(%)={(植物由来のポリエチレン樹脂の合計質量)/(押出成形品を構成する全樹脂の合計質量)}×100
例1~9のチューブの「最内層および最外層の樹脂組成」および「評価結果」を下記表1に示す。表中の「配合量」の値は、質量部を表し、「超音波シール強度」の値は、ニュートンを表す。
Claims (13)
- 全体としてチューブ形状を有し、最内層、第1接着層、中間層、第2接着層、および最外層が順に積層された5層構造を有し、前記最内層および前記最外層の各々が、植物由来のポリエチレン樹脂を含む、チューブ容器用押出成形品。
- 前記最内層および前記最外層の各々が、低密度ポリエチレン樹脂と直鎖状低密度ポリエチレン樹脂とを含み、前記低密度ポリエチレン樹脂および前記直鎖状低密度ポリエチレン樹脂の少なくとも一方が植物由来である、請求項1に記載の押出成形品。
- 前記最内層および前記最外層の各々が、植物由来の低密度ポリエチレン樹脂と、植物由来の直鎖状低密度ポリエチレン樹脂とを含む請求項2に記載の押出成形品。
- 前記最内層および前記最外層の各々が、植物由来の低密度ポリエチレン樹脂と、石油由来の直鎖状低密度ポリエチレン樹脂とを含む請求項2に記載の押出成形品。
- 前記最内層および前記最外層の各々が、石油由来の低密度ポリエチレン樹脂と、植物由来の直鎖状低密度ポリエチレン樹脂とを含む請求項2に記載の押出成形品。
- 前記最内層および前記最外層の各々が、前記低密度ポリエチレン樹脂と前記直鎖状低密度ポリエチレン樹脂とを、9:1~1:9の質量比で含む請求項2~5の何れか1項に記載の押出成形品。
- 前記押出成形品が、植物由来のポリエチレン樹脂を40質量%を超える量で含む請求項1~6の何れか1項に記載の押出成形品。
- 前記第1接着層および前記第2接着層の各々が、酸変性ポリエチレン樹脂を含む請求項1~7の何れか1項に記載の押出成形品。
- 前記酸変性ポリエチレン樹脂が、無水マレイン酸変性ポリエチレン樹脂である請求項8に記載の押出成形品。
- 前記中間層が、ガスバリア性を有する樹脂を含む請求項1~9の何れか1項に記載の押出成形品。
- 前記樹脂が、エチレン-ビニルアルコール共重合体樹脂である請求項10に記載の押出成形品。
- 請求項1~11の何れか1項に記載の押出成形品と、
前記押出成形品の上に設けられた1以上の層と
を備えた、チューブ容器用成形品。 - 一端がシールされた請求項1~11の何れか1項に記載の押出成形品または一端がシールされた請求項12に記載の成形品を含む容器本体と、
前記一端がシールされた前記押出成形品または前記一端がシールされた前記成形品の他端に接合されたキャップ嵌合部分と
を備えたチューブ容器。
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JP2006240666A (ja) * | 2005-03-03 | 2006-09-14 | Takeuchi Press Ind Co Ltd | 多層チューブ容器 |
JP2019094509A (ja) * | 2019-03-15 | 2019-06-20 | 大日本印刷株式会社 | ポリオレフィン樹脂フィルム |
JP2020164596A (ja) * | 2019-03-28 | 2020-10-08 | 大日本印刷株式会社 | 樹脂フィルム、積層体及び包装製品 |
JP2021028144A (ja) * | 2019-08-09 | 2021-02-25 | 三菱ケミカル株式会社 | 多層構造体 |
JP2021030533A (ja) * | 2019-08-21 | 2021-03-01 | 大日本印刷株式会社 | 樹脂フィルム及びラミネートチューブ容器 |
WO2021251101A1 (ja) * | 2020-06-12 | 2021-12-16 | 大和製罐株式会社 | チューブ容器用押出成形品およびチューブ容器 |
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JP2006240666A (ja) * | 2005-03-03 | 2006-09-14 | Takeuchi Press Ind Co Ltd | 多層チューブ容器 |
JP2019094509A (ja) * | 2019-03-15 | 2019-06-20 | 大日本印刷株式会社 | ポリオレフィン樹脂フィルム |
JP2020164596A (ja) * | 2019-03-28 | 2020-10-08 | 大日本印刷株式会社 | 樹脂フィルム、積層体及び包装製品 |
JP2021028144A (ja) * | 2019-08-09 | 2021-02-25 | 三菱ケミカル株式会社 | 多層構造体 |
JP2021030533A (ja) * | 2019-08-21 | 2021-03-01 | 大日本印刷株式会社 | 樹脂フィルム及びラミネートチューブ容器 |
WO2021251101A1 (ja) * | 2020-06-12 | 2021-12-16 | 大和製罐株式会社 | チューブ容器用押出成形品およびチューブ容器 |
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