WO2023100403A1 - 積層フィルム、及びその製造方法 - Google Patents
積層フィルム、及びその製造方法 Download PDFInfo
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- WO2023100403A1 WO2023100403A1 PCT/JP2022/025331 JP2022025331W WO2023100403A1 WO 2023100403 A1 WO2023100403 A1 WO 2023100403A1 JP 2022025331 W JP2022025331 W JP 2022025331W WO 2023100403 A1 WO2023100403 A1 WO 2023100403A1
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- ethylene polymer
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- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 125000006353 oxyethylene group Chemical group 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 235000019809 paraffin wax Nutrition 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 235000019271 petrolatum Nutrition 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- PAYRUJLWNCNPSJ-UHFFFAOYSA-O phenylazanium Chemical compound [NH3+]C1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-O 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical group [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 1
- 125000005496 phosphonium group Chemical group 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000223 polyglycerol Polymers 0.000 description 1
- 229920000151 polyglycol Polymers 0.000 description 1
- 239000010695 polyglycol Substances 0.000 description 1
- 229920001522 polyglycol ester Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920006124 polyolefin elastomer Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 125000005373 siloxane group Chemical group [SiH2](O*)* 0.000 description 1
- 125000003808 silyl group Chemical group [H][Si]([H])([H])[*] 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910000269 smectite group Inorganic materials 0.000 description 1
- 239000011949 solid catalyst Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 150000003871 sulfonates Chemical class 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
-
- 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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- 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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
-
- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
-
- 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
- B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
-
- 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
-
- 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
- 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
Definitions
- the present invention relates to a laminated film and its manufacturing method.
- plastic (resin) films are often used as laminated films having multiple layers with various functions.
- resin films include single-use resin packaging materials.
- a resin packaging material includes a resin film such as an oriented nylon film and a polyethylene terephthalate (PET) film, a base layer formed from a metal film such as aluminum, and a sealant layer containing a polyethylene film or the like. formed by
- the base film and the sealant film can be laminated via an adhesive or the like.
- Patent Document 1 describes layers A, B, and C, a barrier layer and/or an adhesive layer, and a predetermined amount of ethylene, each containing an ethylene polymer containing a predetermined amount of ethylene-derived structural units.
- a layer D containing an ethylene polymer containing a structural unit derived from is laminated, the layer B contains an inorganic filler, and the density of the ethylene polymer contained in the layer D is 880 kg / m 3 or more and less than 930 kg / m 3 and a melt flow rate of 0.01 g/10 min to 3 g/10 min.
- a laminated film comprising a base material layer made of resin such as nylon and polyethylene terephthalate (PET) and a sealant layer made of polyethylene resin, etc., requires separation and recovery of the resin that makes up each layer. The problem is that it is difficult.
- a base material layer made of resin such as nylon and polyethylene terephthalate (PET)
- PET polyethylene terephthalate
- sealant layer made of polyethylene resin
- the laminated film described in Patent Document 1 satisfies the standards of rigidity and heat shrinkage resistance required for packaging materials without laminating a resin film such as polyethylene terephthalate.
- the laminated film described in Patent Document 1 has room for improvement in terms of impact strength.
- An object of one aspect of the present invention is to provide a laminated film that is easy to recycle and has excellent impact strength, and related technology.
- the present inventors have found that, in a laminated film obtained by laminating a layer containing an ethylene polymer and a layer containing an ethylene polymer and an inorganic filler, an ethylene polymer ( By providing a layer D containing D) and an inorganic filler (B), it is possible to obtain a laminated film having high impact strength while being a monomaterial film containing polyethylene resin as a main component. I came to complete it.
- a laminated film comprises A layer A containing an ethylene polymer (A) containing 80 mol% or more of structural units derived from ethylene; A layer B containing an ethylene polymer (B) containing 70 mol% or more of structural units derived from ethylene and an inorganic filler (A); A layer C containing an ethylene polymer (C) containing 70 mol% or more of structural units derived from ethylene; one or more layers selected from the group consisting of a barrier layer and an adhesive layer; An ethylene polymer (D) containing 70 mol% or more of structural units derived from ethylene and an inorganic filler (B) are contained, and the total content of the ethylene polymer (D) and the inorganic filler (B) is 100% by mass.
- a layer D in which the content of the ethylene polymer (D) is 75% by mass or more and less than 99.5% by mass and the content of the inorganic filler (B) is 0.5% by mass or more and less than 25% by mass Having a layer E containing an ethylene polymer (E) containing 70 mol% or more of structural units derived from ethylene, Layer A/Layer B/Layer C/Barrier layer/Layer D/Layer E in this order, In order of layer A/layer B/layer C/adhesive layer/layer D/layer E, Layer A/Layer B/Layer C/Barrier layer/Adhesive layer/Layer D/Layer E in this order, Layer A/layer B/layer C/adhesive layer/barrier layer/layer D/layer E are laminated in this order.
- a laminated film includes a layer A containing an ethylene polymer (A), a layer B containing an ethylene polymer (B) and an inorganic filler (A), and an ethylene polymer (C).
- layer C one or more layers selected from the group consisting of a barrier layer and an adhesive layer, a layer D containing an ethylene polymer (D) and an inorganic filler (B), and an ethylene polymer (E)
- a layer E is laminated in this order, and at least one layer selected from a barrier layer and an adhesive layer is laminated between the layer C and the layer D.
- a layer obtained by laminating Layer A, Layer B, and Layer C in this order may be a base layer.
- the film forming the base layer is sometimes called a base film.
- Layers D and E may also be sealant layers.
- the film forming the sealant layer is sometimes called a sealant film. That is, the laminated film according to one aspect of the present invention includes a layer C in the base layer in which the layer A, the layer B, and the layer C are laminated in this order, and the layer D in the sealant layer including the layer D and the layer E and may be a laminated film laminated via one layer selected from the group consisting of a barrier layer and an adhesive layer.
- the laminated film according to one aspect of the present invention may have a layer F containing an ethylene polymer (F) between the layer E and the layer D.
- a printed layer may be provided between layer C and one layer selected from the group consisting of a barrier layer and an adhesive layer, and one layer selected from the group consisting of a barrier layer and an adhesive layer and layer D. You may provide a printing layer between.
- Base film (base layer)
- the base film includes a layer A containing the ethylene polymer (A), a layer B containing the ethylene polymer (B) and an inorganic filler, and a layer C containing the ethylene polymer (C), which are laminated in this order.
- Layer A may be an outer layer
- Layer B may be an intermediate layer
- Layer C may be an inner layer.
- the ethylene polymer (A), the ethylene polymer (B), and the ethylene polymer (C) are each the molar fraction, density, and melt flow rate (MFR) of monomer units derived from ethylene in the ethylene polymer. ).
- the base film contains an inorganic filler at least in Layer B.
- each layer A, layer B, and layer C constituting the base film may contain an additive, if necessary.
- Ethylene Polymer [1-1-1] Mole Fraction of Monomer Units Derived from Ethylene
- the molar fraction of monomer units derived from ethylene is determined by, for example, the FT-IR method and the NMR method. can be obtained by
- the ethylene polymer (A) contained in layer A contains 80 mol% or more of structural units derived from ethylene, preferably 97 mol% or more, more preferably 98 mol% or more, and 99 mol% or more. is more preferred.
- the ethylene polymer (A) may be composed of structural units derived from 100 mol % of ethylene. By including 80 mol % or more of structural units derived from ethylene, the effect is that high heat resistance and chemical resistance can be imparted to the film.
- the ethylene polymer (A) contained in the layer A two or more ethylene polymers described later may be used in combination.
- At least one of the two or more ethylene polymers should contain 80 mol % or more of structural units derived from ethylene as the ethylene polymer (A).
- the ethylene polymer (A) and an ethylene polymer other than the ethylene polymer (A) are used in combination, the ethylene polymer (A) contained in the layer A and the ethylene polymer other than the ethylene polymer (A) Taking the total as 100% by mass, the content of the ethylene polymer (A) is preferably 60% by mass or more, more preferably 80% by mass or more.
- Layer A can be suitably formed when the content of the ethylene polymer (A) is 90% by mass or more.
- the ethylene polymer (B) contained in layer B contains 70 mol% or more of structural units derived from ethylene, preferably 97 mol% or more, more preferably 98 mol% or more, and 99 mol% or more. is more preferred.
- the ethylene polymer (B) may be composed of structural units derived from 100 mol % of ethylene. By containing 70 mol % or more of structural units derived from ethylene, the ethylene polymer (B) has the effect of enhancing film formation stability and imparting rigidity to the film.
- two or more ethylene polymers described later may be used in combination.
- At least one of the two or more ethylene polymers should contain 70 mol % or more of structural units derived from ethylene as the ethylene polymer (B).
- the total of the two or more ethylene polymers contained in the layer B is 100% by mass, and the ethylene polymer (
- the content of B) is preferably 60% by mass or more, more preferably 80% by mass or more.
- Layer B can be suitably formed when the content of the ethylene polymer (B) is 90% by mass or more.
- the ethylene polymer (C) contained in Layer C contains 70 mol% or more of structural units derived from ethylene, preferably 97 mol% or more, more preferably 98 mol% or more, and 99 mol% or more. is more preferred.
- the ethylene polymer (C) may be composed of structural units derived from 100 mol % of ethylene. Since the ethylene polymer (B) contains 70 mol % or more of structural units derived from ethylene, it has the effect of imparting high anti-blocking properties to the base film.
- two or more ethylene polymers described later may be used in combination.
- At least one of the two or more ethylene polymers should contain 70 mol % or more of structural units derived from ethylene as the ethylene polymer (C).
- the ethylene polymer (C) and an ethylene polymer other than the ethylene polymer (C) are used in combination, the total of two or more ethylene polymers contained in the layer C is 100% by mass, and the ethylene polymer ( The content of C) is preferably 60% by mass or more, more preferably 80% by mass or more.
- Layer C can be suitably formed when the content of the ethylene polymer (C) is 90% by mass or more.
- the ethylene polymer (A) contained in layer A contains 80 mol% or more of ethylene-derived structural units
- the ethylene polymer (B) contained in layer B contains 70 mol% or more of ethylene-derived structural units.
- the ethylene polymer (C) contained in Layer C contains 70 mol % or more of structural units derived from ethylene.
- the base film provides the layer A with the function of the outer layer, the layer B with the function of the intermediate layer, and the layer C with the function of the inner layer. ), the ethylene polymer (B), and the ethylene polymer (C) can be suitably dissolved.
- [1-1-2] Density of Ethylene Polymer The densities of the ethylene polymer (A), ethylene polymer (B) and ethylene polymer (C) are determined after annealing treatment specified in JIS K6760-1995. , measured according to A method described in JIS K7112-1980.
- the density of the ethylene polymer (A) contained in Layer A is preferably 930 kg/m 3 or more, more preferably 935 kg/m 3 or more, and more preferably 940 kg/m 3 from the viewpoint of increasing the rigidity of the film. It is more preferable that it is above. From the viewpoint of enhancing the transparency of the film, it is preferably less than 970 kg/m 3 , more preferably 960 kg/m 3 or less.
- the density of the ethylene polymer (B) contained in Layer B is preferably 930 kg/m 3 or more, more preferably 935 kg/m 3 or more, and more preferably 940 kg/m 3 from the viewpoint of increasing the rigidity of the film. It is more preferable that it is above. In addition, from the viewpoint of enhancing filler receptivity to Layer B and enhancing film processing stability, it is preferably less than 970 kg/m 3 , more preferably 960 kg/m 3 or less.
- the density of the ethylene polymer (C) contained in the layer C is determined from the viewpoint of film rigidity, handleability and impact strength, and from the viewpoint of suitable reuse together with the ethylene polymer (A) and the ethylene polymer (B). Therefore, it is preferably 900 kg/m 3 or more, more preferably 910 kg/m 3 or more, and even more preferably 915 kg/m 3 or more. Also, from the viewpoint of enhancing the transparency of the film, it is preferably less than 970 kg/m 3 , more preferably 960 kg/m 3 or less.
- Melt flow rate of ethylene polymer Melt flow rate (MFR) of ethylene polymer (A), ethylene polymer (B), and ethylene polymer (C) is JIS K7210-1-2014. , at a temperature of 190°C and a load of 21.18N.
- the melt flow rate (MFR) of the ethylene polymer (A) is preferably 0.01 g/10 minutes or more from the viewpoint of fish eyes, fluidity, film surface appearance, adhesiveness, and the like. It is more preferably 10 minutes or more. Moreover, from the viewpoint of increasing the strength of the film, it is preferably less than 3 g/10 minutes, more preferably 2 g/10 minutes or less.
- the MFR of the ethylene polymer (B) is preferably 3 g/10 minutes or more, more preferably 4 g/10 minutes or more, from the viewpoints of fish eyes, fluidity, film surface appearance, adhesiveness, and the like. .
- it is preferably less than 25 g/10 minutes, more preferably 15 g/10 minutes or less.
- the MFR of the ethylene polymer (C) is preferably 0.01 g/10 min or more, more preferably 0.1 g/10 min, from the viewpoint of suitably adjusting the extrusion load in film forming and increasing the film strength. minutes or more, more preferably 0.5 g/10 minutes or more, and preferably less than 3 g/10 minutes, more preferably 2.5 g/10 minutes or less, still more preferably 2 g/10 minutes. minutes or less.
- ethylene polymer Ethylene polymer (A), ethylene polymer (B) and ethylene polymer (C) are, respectively, high-pressure low-density polyethylene, high-density polyethylene, ethylene- ⁇ - Ethylene polymers such as olefin copolymers, ethylene-vinyl ester copolymers, and ethylene-unsaturated carboxylic acid ester copolymers can be used.
- ethylene polymers ethylene- ⁇ -olefin copolymers, high-pressure low-density polyethylenes, and high-density polyethylenes are preferably used for the ethylene polymer (A). , and high density polyethylene are more preferably used.
- Ethylene- ⁇ -olefin copolymers and high-density polyethylene are preferably used for the ethylene polymer (B).
- high-pressure low-density polyethylene, high-density polyethylene, and ethylene- ⁇ -olefin copolymer are preferably used, and ethylene- ⁇ -olefin copolymer is more preferably used.
- the ⁇ -olefins having 3 to 20 carbon atoms used in the constituent units of the ethylene- ⁇ -olefin copolymer include propylene, 1-butene, 1 -Pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-dodecene, 4-methyl-1-pentene, 4-methyl-1-hexene, etc., and these alone may be used, or two or more may be used in combination.
- ethylene- ⁇ -olefin copolymers examples include ethylene-propylene copolymers, ethylene-1-butene copolymers, ethylene-1-hexene copolymers, ethylene-1-octene copolymers, ethylene-1 -Butene-1-hexene copolymer, ethylene-1-butene-1-octene copolymer, etc., may be used alone, or two or more thereof may be used in combination. Further, ethylene-1-butene copolymer, ethylene-1-hexene copolymer, and ethylene-1-butene-1-hexene copolymer are preferable.
- Examples of methods for producing ethylene- ⁇ -olefin copolymers include production methods by known polymerization methods using known radical polymerization catalysts and ionic polymerization catalysts.
- Examples of known catalysts include peroxide catalysts, Ziegler-Natta catalysts, metallocene catalysts, etc.
- Examples of known polymerization methods include solution polymerization, slurry polymerization, high-pressure ion polymerization, high-pressure A radical polymerization method, a vapor phase polymerization method, and the like can be mentioned.
- Ziegler-Natta catalysts include, for example, catalysts composed of solid catalyst components for olefin polymerization containing titanium atoms, magnesium atoms and halogen atoms, and organometallic compounds.
- No. 322833 discloses a catalyst.
- metallocene-based catalysts include the following catalysts (1) to (4).
- a catalyst comprising a component containing a transition metal compound having a group having a cyclopentadiene skeleton and a component containing an alumoxane compound (2) A component containing the transition metal compound and ions such as trityl borate and anilinium borate (3) A catalyst comprising a component containing the transition metal compound, a component containing the ionic compound, and an organometallic compound (4)
- Each of the above components is combined with SiO 2 , Al 2 O 3 and the like, and particulate polymer supports such as olefin polymers such as ethylene and styrene, and catalysts obtained by supporting or impregnating the above organometallic compounds, for example, butyllithium, triethyl Aluminum etc. are mentioned.
- the ethylene- ⁇ -olefin copolymer is preferably an ethylene- ⁇ -olefin copolymer produced by a gas phase polymerization method using a metallocene catalyst.
- Specific examples of the ethylene- ⁇ -olefin copolymer include ethyne- ⁇ -olefin copolymers described in JP-A-9-183816.
- the production method includes polymerizing ethylene and an ⁇ -olefin having 3 to 12 carbon atoms by a known polymerization method using a known catalyst.
- known catalysts include Ziegler-Natta catalysts
- known polymerization methods include, for example, gas phase-solid phase polymerization in the presence or absence of a solvent, liquid phase-solid phase polymerization. , a homogeneous liquid phase polymerization method, and the like.
- the polymerization temperature is usually 30 to 300° C.
- the polymerization pressure is usually atmospheric pressure to 3000 kg/cm 2 .
- ethylene polymers such as high-pressure low-density polyethylene, ethylene-vinyl ester copolymers, and ethylene-unsaturated carboxylic acid ester copolymers may be produced by known production methods, and commercially available products may be used. .
- Inorganic filler (A) At least the layer B of the base film contains an inorganic filler (A).
- the content of the inorganic filler in layer B is preferably 20% by mass to 80% by mass, preferably 30% by mass, with respect to the total content of 100% by mass of the ethylene polymer (B) and the inorganic filler (A). It is more preferably ⁇ 70% by mass.
- a film such as a polyethylene terephthalate (PET) film or a polyamide film is not laminated on the base film, and the base film can be formed.
- PET polyethylene terephthalate
- the base film and the laminated film can be suitably regenerated as a molding material composition of the ethylene polymer and the inorganic filler.
- the content of the inorganic filler (A) in the layer B is 80% by mass or less, the layers A and C can be successfully co-extruded, and the base film can be successfully formed.
- the layers A and C may also contain an inorganic filler.
- the content of the inorganic filler in the layer A is not particularly limited as long as it is less than 20% by mass with respect to 100% by mass of the total content of the ethylene polymer (A) and the inorganic filler.
- the content of the inorganic filler in the layer C is not limited to 100% by mass of the total content of the ethylene polymer (C) and the inorganic filler, but may be less than 20% by mass.
- Inorganic fillers that can be contained in layers A, B, and C constituting the base film include calcium carbonate, kaolin, metakaolin, hydrotalcite, mica, talc, and fibrous basic magnesium sulfate particles. By using these inorganic fillers, it is possible to avoid impairing the transparency of the film. Hydrotalcite, talc and fibrous basic magnesium sulfate particles are more preferred from the viewpoint of increasing the rigidity of the film. These inorganic fillers may be used alone or in combination of two or more. Moreover, the inorganic filler may be surface-treated with, for example, a coupling agent. In addition, Layer A, Layer B, and Layer C may contain coloring pigments such as titanium oxide and iron oxide as inorganic fillers.
- the median diameter (d50) of the inorganic filler is not limited, it is preferably 0.5 to 10 ⁇ m.
- the median diameter (d50) of the inorganic filler can be measured as a volume-based median diameter by a laser diffraction method.
- the fiber length is preferably 8 to 30 ⁇ m and the fiber diameter is preferably 0.5 to 1.0 ⁇ m, although not limited thereto.
- Additives Layers A, B and C may contain at least one additive, if necessary, as long as the objects and effects of the present invention are not impaired.
- Additives include lubricants, stabilizers (antioxidants), surfactants, antistatic agents, workability improvers, anti-blocking agents, and dyes.
- lubricants include paraffin waxes such as liquid paraffin, natural paraffin, microwax, polyethylene wax, chlorinated paraffin, fluorocarbon, and synthetic paraffin; fatty acid waxes such as stearic acid, palmitic acid, myristic acid, behenic acid, and arachidine; Fatty acid lower alcohol esters such as butyl stearate; esters such as polyhydric alcohols, polyglycol esters and higher alcohol esters; zinc stearate, magnesium stearate , calcium stearate, and Lonozinc; polyhydric alcohols such as fatty alcohols, ethylene glycol, diethylene glycol, and triethylene glycol; partial esters of fatty acids and polyhydric alcohols; partial esters of fatty acids and polyglycol/polyglycerol and two or more lubricants may be used in combination.
- paraffin waxes such as liquid paraffin, natural paraffin, microwax, polyethylene wax, chlorinated paraffin, fluor
- the lubricant is preferably blended in the layer containing the inorganic filler. It is preferably contained in an amount of 0 parts by mass.
- stabilizers examples include 2,6-di-t-butyl-p-cresol (BHT), tetrakis[methylene-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate]methane (IRGANOX (registered trademark) 1010, manufactured by BASF), n-octadecyl-3-(4'-hydroxy-3,5'-di-t-butylphenyl) propionate (IRGANOX (registered trademark) 1076, manufactured by BASF), etc.
- Phenolic stabilizers represented by, phosphites represented by bis(2,4-di-t-butylphenyl) pentaerythritol diphosphite, tris(2,4-di-t-butylphenyl) phosphite, etc. Stabilizers and the like are included.
- surfactants include carboxylates, fatty acid salts, cyclic fatty acid salts, special polycarboxylate-type active agents, sulfonates, alkyl or alkenyl sulfonates, alkylallylsulfonates, and alkylarylsulfonates.
- Anionic surfactants such as ester salts and inorganic phosphates
- Nonionic surfactants such as oxyethylene/polyoxypropylene block polymers, polyoxyethylene alkylamines, polyoxyethylene alkylamides, and polyhydric alcohol derivatives
- cationic surfactants such as alkylamine salts and quaternary ammonium salts
- Amphoteric surfactants such as alkylbetaine; fluorosurfactants, silicon surfactants, reactive surfactants, etc. can be mentioned, and one or more of these compounds can be used.
- Layer A, Layer B, and Layer C may contain, as an additive, a polyolefin resin such as a low-density elastomer used for improving impact strength.
- a polyolefin resin such as a low-density elastomer used for improving impact strength.
- Barrier Layer and Adhesive Layer At least one layer selected from the group consisting of a barrier layer and an adhesive layer is a layer positioned between the layer C and the layer D and is either a barrier layer or an adhesive layer. It may be a single layer or multiple layers including a barrier layer and an adhesive layer.
- the barrier layer is a layer that prevents permeation of gases such as oxygen and water vapor.
- the barrier layer includes, for example, a metal oxide layer formed by vapor-depositing an inorganic compound, and a layer formed from a composition containing an inorganic stratiform compound and a polyvinyl alcohol-based resin.
- layers formed by vapor-depositing an inorganic compound include layers formed from silicon oxide, alumina, and spinel.
- the barrier layer may be, for example, a layer formed from a composition containing an inorganic stratiform compound and a polyvinyl alcohol-based resin.
- examples of inorganic layered compounds include kaolinite group, smectite group, and mica group.
- smectites such as layered silicate minerals, hectorites, and sabonites are preferred, and resins are incorporated between the layers of the inorganic layered compound to facilitate formation of a composite.
- layered silicate minerals are preferable and can provide high oxygen gas barrier properties.
- a polyvinyl alcohol-based resin is a polymer whose main component is a structural unit derived from vinyl alcohol.
- polyvinyl alcohol examples include polymers obtained by hydrolyzing the acetate moiety of vinyl acetate polymers, trifluorovinyl acetate polymers, vinyl formate polymers, vinyl pivalate polymers, t- Examples thereof include polymers obtained by hydrolyzing butyl vinyl ether polymers, trimethylsilyl vinyl ether polymers, and the like (for details of "polyvinyl alcohol", see, for example, Poval Kai, "The World of PVA", 1992, Co., Ltd.
- the degree of "saponification" of the ester portion of the polymer is preferably 70 mol % or more, more preferably 85 mol % or more, and even more preferably 98 mol % or more.
- the degree of polymerization of the polymer used is preferably 100 or more and 5000 or less, more preferably 200 or more and 3000 or less.
- the vinyl alcohol may be a so-called vinyl alcohol derivative having a functional group other than a hydroxyl group.
- examples include carboxylate groups, sulfonate ion groups, phosphate ion groups, ammonium groups, phosphonium groups, silyl groups, siloxane groups, alkyl groups, allyl groups, fluoroalkyl groups, alkoxy groups, carbonyl groups, halogen groups and the like.
- the polyvinyl alcohol-based resin may be a copolymer containing structural units derived from vinyl alcohol and structural units derived from ⁇ -olefins such as ethylene and propylene.
- the content of structural units derived from ⁇ -olefin contained in the copolymer is preferably 40 mol% or less from the viewpoint of solubility in an aqueous solvent. , 15 mol % or less.
- the adhesive layer may be formed from a water-based or solvent-based dry laminating adhesive, or may be formed from a non-solvent laminating adhesive.
- adhesives for forming the adhesive layer include polyurethane adhesives such as polyether polyurethane adhesives and polyester polyurethane adhesives, polyester adhesives, imine adhesives, titanate adhesives, and the like. can be mentioned.
- polyurethane-based adhesives include Takelac (registered trademark) (manufactured by Mitsui Chemicals) and Takenate (registered trademark) (manufactured by Mitsui Chemicals).
- adhesive layers include high-density polyethylene, low-density polyethylene, ultra-low-density polyethylene, ultra-low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic acid ester copolymer, ethylene- Methacrylic acid copolymer, ethylene-methacrylic acid ester copolymer, ethylene-vinyl alcohol copolymer, saponified ethylene-vinyl acetate copolymer, ethylene-styrene copolymer, ethylene-vinylcyclohexane copolymer, ethylene- Norbornene copolymers, polyolefin rubbers, styrene-butadiene rubbers, styrene-butadiene-styrene block copolymers, isoprene rubbers, styrene-isoprene rubbers, isobutylene rubbers, layers formed
- the sealant film is a film formed by laminating a layer D containing an ethylene polymer (D) and an inorganic filler (B) and a layer E containing an ethylene polymer (E) in this order, and the layer D is an inner layer. , layer E may be the outer layer.
- the sealant film has an impact strength and a heat seal peel strength in the laminated film. can be compatible.
- the sealant film may be provided with a layer F containing an ethylene polymer (F) as an intermediate layer between the layer D and the layer E.
- F ethylene polymer
- a laminated film according to one aspect of the present invention is a polyethylene terephthalate (PET) film and a polyamide film by laminating a sealant film in which a layer D and a layer E are laminated on a material-recyclable base film.
- PET polyethylene terephthalate
- the impact strength can be increased without laminating a film such as the above on the base film. That is, it is possible to increase the impact strength of the laminated film while maintaining the characteristic of being material recyclable.
- layer D preferably contains an ethylene polymer (G) in addition to the ethylene polymer (D) and the inorganic filler (B).
- Ethylene polymer [3-1-1] Mole fraction of monomer units derived from ethylene
- the ethylene polymer (D) contained in the layer D contains 70 mol% of structural units derived from ethylene. or more, preferably 90 mol % or more.
- the ethylene polymer (D) may be composed of structural units derived from 100 mol % of ethylene.
- the layer D may contain an ethylene polymer (G) and/or an ethylene polymer other than the ethylene polymer (G), which will be described later.
- the ethylene polymer (D) contained in the layer D and the ethylene polymer other than the ethylene polymer (G) is preferably 60% by mass or more, more preferably 80% by mass or more, with the total being 100% by mass. More preferably, it is 90% by mass or more.
- the content of the ethylene polymer (D) contained in the layer D ethylene Assuming that the total content of the polymer (G) and the content of the ethylene polymer other than the ethylene polymer (G) is 100% by mass, the content of the ethylene polymer (D) and the ethylene polymer (G) is It is preferably 60% by mass or more, more preferably 80% by mass or more, and further preferably 90% by mass or more from the viewpoint of forming the layer D suitably.
- the ethylene polymer (E) contained in the layer E may contain 70 mol% or more, preferably 90 mol% or more of structural units derived from ethylene.
- the ethylene polymer (E) may be composed of structural units derived from 100 mol % of ethylene.
- the total of the two or more ethylene polymers contained in the layer E is 100% by mass, and the ethylene polymer (
- the content of E) is preferably 60% by mass or more, more preferably 80% by mass or more, and from the viewpoint of suitably forming Layer E, the content of ethylene polymer (E) is 90% It is more preferably at least 10% by mass.
- the ethylene polymer (F) contained in the layer F may contain 70 mol% or more, preferably 90 mol% or more of structural units derived from ethylene.
- the ethylene polymer (F) may be composed of structural units derived from 100 mol % of ethylene.
- the total of two or more ethylene polymers contained in the layer F is 100% by mass, and the ethylene polymer (The content of F) is preferably 60% by mass or more, more preferably 80% by mass or more, and from the viewpoint of suitably forming the layer F, the content of the ethylene polymer (F) is 90% It is more preferably at least 10% by mass.
- Layer D may contain an ethylene polymer (G) in addition to the ethylene polymer (D).
- the ethylene polymer (G) may contain 70 mol % or more, preferably 90 mol % or more of structural units derived from ethylene.
- the ethylene polymer (G) may be composed of structural units derived from 100 mol % of ethylene.
- the amount of the ethylene polymer (G) is The content is preferably 0.1 parts by mass or more and 20 parts by mass or less.
- the content of the ethylene polymer (G) is 0.1 parts by mass or more and 20 parts by mass or less with respect to the total 100 parts by mass of the content of the ethylene polymer (D) and the content of the inorganic filler (B). Thereby, the impact strength of the laminated film can be increased.
- the ethylene polymer (D) contained in layer D, the ethylene polymer (E) contained in layer E, and the ethylene polymer (F) contained in layer F contain 70 mol% or more of structural units derived from ethylene.
- the sealant film can form a laminated film by laminating the sealant film on the base film while giving the layer D the function of an inner layer, the layer F the function of an intermediate layer, and the layer E the function of an outer layer.
- the ethylene polymer (A), the ethylene polymer (B), and the ethylene polymer (C) in the base film and the ethylene polymer (D ), the ethylene polymer (E), and the ethylene polymer (F) can be suitably dissolved.
- the density of (G) is measured according to A method described in JIS K7112-1980 after performing annealing treatment specified in JIS K6760-1995.
- the density of the ethylene polymer (D) is preferably 900 kg/m 3 or more, more preferably 910 kg/m 3 or more, still more preferably 915 kg/m 3 or more, from the viewpoint of being suitably reused together with the base film. / m 3 or more. From the viewpoint of increasing the impact strength of the sealant film, it is preferably less than 930 kg/m 3 , more preferably 925 kg/m 3 or less.
- the density of the ethylene polymer (E) is preferably 880 kg/m 3 or more, more preferably 890 kg, from the viewpoint of maintaining the handleability as a sealant film, maintaining the transparency of the film, and increasing the heat seal peel strength. /m 3 or more, more preferably 895 kg/m 3 or more, and preferably less than 930 kg/m 3 .
- the density of the ethylene polymer (F) is preferably 910 kg/m 3 or more, more preferably 913 kg/m 3 or more, still more preferably 915 kg/m 3 or more, and less than 930 kg/m 3 .
- the density of the ethylene polymer (F) is 910 kg/m 3 or more and less than 930 kg/m 3 , the falling body strength of the bag formed of the laminated film can be enhanced.
- the density of the ethylene polymer (G) is preferably 940 kg/m 3 or more, more preferably 945 kg/m 3 or more, still more preferably 950 kg/m 3 or more, from the viewpoint of increasing the impact strength of the sealant film. m 3 or more is preferred.
- As a sealant film it is preferably less than 970 kg/m 3 , and more preferably 965 kg/m 3 or less, from the viewpoint of enhancing filler receptivity to layer D and enhancing processing stability of the film .
- Melt flow rate of ethylene polymer Melt flow rate (MFR) of ethylene polymer (D), ethylene polymer (E), ethylene polymer (F), and ethylene polymer (G) is It is measured at a temperature of 190° C. and a load of 21.18 N according to JIS K7210-1-2014, like the ethylene polymer (A).
- the MFR of the ethylene polymer (D) is preferably 0.01 g/10 min or more, more preferably 0.1 g/10 min, from the viewpoint of suitably adjusting the extrusion load in film forming and increasing the film strength. minutes or more, more preferably 0.5 g/10 minutes or more, preferably less than 3 g/10 minutes, and more preferably 2 g/10 minutes or less.
- the MFR of the ethylene polymer (E) is preferably 0.01 g/10 min or more, more preferably 0.1 g/10 min, from the viewpoint of suitably adjusting the extrusion load in film forming and increasing the film strength. minutes or more, more preferably 0.5 g/10 minutes or more, preferably less than 3 g/10 minutes, and more preferably 2 g/10 minutes or less.
- the MFR of the ethylene polymer (F) is preferably 0.01 g/10 min or more, more preferably 0.1 g/10 min, from the viewpoint of suitably adjusting the extrusion load in film forming and increasing the film strength. minutes or more, more preferably 0.5 g/10 minutes or more, preferably less than 3 g/10 minutes, and more preferably 2 g/10 minutes or less.
- the MFR of the ethylene polymer (G) is preferably 0.01 g/10 min or more, more preferably 0.1 g/10 min, from the viewpoint of suitably adjusting the extrusion load in film forming and increasing the film strength. minutes or more, more preferably 0.5 g/10 minutes or more, preferably less than 10 g/10 minutes, more preferably 7 g/10 minutes or less, still more preferably 5 g/10 minutes. or less, and most preferably 3 g/10 minutes or less.
- the ethylene polymer (D), ethylene polymer (E), ethylene polymer (F) and ethylene polymer (G) are each high-pressure low-density polyethylene, Ethylene polymers such as high-density polyethylene, ethylene- ⁇ -olefin copolymers, ethylene-vinyl ester copolymers, and ethylene-unsaturated carboxylic acid ester copolymers can be used.
- ethylene- ⁇ -olefin copolymers ethylene- ⁇ -olefin copolymers, high-pressure low-density polyethylene, and high-density polyethylene are preferably used for the ethylene polymer (D) and the ethylene polymer (E).
- - ⁇ -olefin copolymers and high-pressure low-density polyethylene are more preferably used.
- high-pressure low-density polyethylene, high-density polyethylene, and ethylene- ⁇ -olefin copolymer are preferably used, and ethylene- ⁇ -olefin copolymer is more preferably used.
- ethylene polymer (G) high-pressure low-density polyethylene, high-density polyethylene, and ethylene- ⁇ -olefin copolymers are preferably used, and ethylene- ⁇ -olefin copolymers and high-density polyethylene are more preferably used. Used.
- Ethylene- ⁇ -olefin copolymers used as ethylene polymer (D), ethylene polymer (E), ethylene polymer (F) and ethylene polymer (G) include, for example, ethylene-propylene copolymer, Ethylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-1-octene copolymer, ethylene-1-butene-1-hexene copolymer, ethylene-1-butene-1-octene copolymer Polymers and the like may be mentioned, and these may be used alone or in combination of two or more. Further, ethylene-1-butene copolymer, ethylene-1-hexene copolymer, and ethylene-1-butene-1-hexene copolymer are preferable.
- the method for producing ethylene polymers including ethylene- ⁇ -olefin copolymers is as described in the above [1-1-4] Types of ethylene polymers.
- a sealant layer contains an inorganic filler (B) in layer D at least.
- the content of the inorganic filler in the layer D is such that the content of the ethylene polymer (D) is 75% by mass or more with respect to the total content of 100% by mass of the ethylene polymer (D) and the inorganic filler (B). It is less than 5% by mass, and the content of the inorganic filler (B) is 0.5% by mass or more and less than 25% by mass.
- the content of the inorganic filler (B) contained in Layer D is 0.5% by mass or more, preferably 1% by mass or more, more preferably 1.5% by mass or more, and 2% by mass or more.
- the content is less than 25% by mass.
- the content of the inorganic filler in the layer D is 0.5% by mass or more and less than 25% by mass, so that the impact strength of the laminated film is increased while maintaining the adhesion between the layer D and the base film. be able to.
- the layer F may also contain an inorganic filler.
- the content of the inorganic filler in the layer F is not limited to 100% by mass of the total content of the ethylene polymer (F) and the inorganic filler, but may be less than 20% by mass.
- the content of the inorganic filler in layer E is not limited to 100% by mass of the total content of the ethylene polymer (E) and the inorganic filler, but may be less than 20% by mass.
- the type, median diameter, fiber length, etc. of the inorganic filler (B) that can be contained in D constituting the sealant film are the same as those of the inorganic filler (A).
- Additive Layers D, E and F may each contain at least one additive, if necessary, as long as the objects and effects of the present invention are not impaired.
- additives include lubricants, stabilizers (antioxidants), surfactants, antistatic agents, workability improvers, antiblocking agents, and dyes.
- Layer D, Layer E and Layer F may contain polyolefin resins such as low-density elastomers used for improving impact strength as additives.
- the surface of the layer C side of the base film (layer A/layer B/layer C) in which layer A, layer B, and layer C are laminated in this order is coronalized. and laminating a sealant film on the corona-treated surface of the layer C side of the base film via one or more layers selected from the group consisting of a barrier layer and an adhesive layer. It can be manufactured by a manufacturing method including:
- the sealant film may be formed by laminating a layer D and a layer E in this order, and a layer F may be laminated between the layer D and the layer E.
- the layer D side is subjected to corona treatment, and a base film is laminated on the layer D side surface via one or more layers selected from the group consisting of a barrier layer and an adhesive layer.
- the method for producing a film-forming resin composition including coalescence is not particularly limited, and may be individually melt-blended (melt-kneaded), individually dry-blended, or one type of The above masterbatch may be dry-blended.
- Various blenders such as Henschel mixers and tumbler mixers are used for dry blending, and various mixers such as single-screw extruders, twin-screw extruders, Banbury mixers and hot rolls are used for melt blending.
- the thickness of the layer A of the base film is preferably 5 ⁇ m or more, more preferably 7 ⁇ m or more, from the viewpoint of improving the processing stability of the film. From the viewpoint of increasing the rigidity of the film, the thickness is preferably 30 ⁇ m or less, more preferably 20 ⁇ m or less.
- the thickness of the layer B of the base film is preferably 10 ⁇ m or more, more preferably 12 ⁇ m or more. Moreover, from the viewpoint of enhancing the processing stability of the film, the thickness is preferably 60 ⁇ m or less, more preferably 40 ⁇ m or less.
- the thickness of layer C of the base film is preferably 5 ⁇ m or more, more preferably 7 ⁇ m or more, from the viewpoint of improving the processing stability of the film. From the viewpoint of increasing the rigidity of the film, the thickness is preferably 30 ⁇ m or less, more preferably 20 ⁇ m or less.
- the thickness ratio of each layer of Layer A/Layer B/Layer C is preferably 1/1/1 to 1/15/1, more preferably 1/2/1 to 1/10/ 1, more preferably 1/2/1 to 1/6/1.
- the thickness of layer D in the sealant film is 10 ⁇ m or more and 150 ⁇ m or less, more preferably 20 ⁇ m or more, and even more preferably 30 ⁇ m or more.
- the amount of the ethylene polymer (D) used can be reduced it is preferably 100 ⁇ m or less, more preferably 80 ⁇ m or less.
- the thickness of the layer E in the sealant film is 10 ⁇ m or more and 150 ⁇ m or less, more preferably 20 ⁇ m or more, and even more preferably 30 ⁇ m or more, from the viewpoint of increasing the heat seal peel strength.
- the amount of the ethylene polymer (E) used can be reduced it is preferably 100 ⁇ m or less, more preferably 80 ⁇ m or less.
- the thickness of the layer F in the sealant film is 10 ⁇ m or more and 150 ⁇ m or less, more preferably 30 ⁇ m or more, from the viewpoint of increasing the drop strength, and the amount of the ethylene polymer (D) used can be reduced. From this point of view, the thickness is preferably 100 ⁇ m or less, more preferably 80 ⁇ m or less.
- the thickness ratio of each layer of layer D/layer E is preferably 1/10 to 5/1, more preferably 1/5 to 3/1, still more preferably 1/3 to 2 /1.
- the thickness ratio of each layer is 1/5 to It is preferably 10/1, more preferably 1/3 to 5/1, even more preferably 1/2 to 3/1.
- the method for producing the base film and the sealant film is not particularly limited, and includes known film production methods, for example, an inflation method using an inflation film production apparatus and a T die cast film production apparatus. Extrusion molding methods such as the T-die method can be used.
- the processed resin temperature is 180°C to 300°C
- the chill roll temperature is 20°C to 80°C.
- an adhesive such as polybutene may be added to the resin composition for forming Layer A, Layer B, Layer C, Layer D, Layer E, and Layer F.
- the method of adding polybutene include a method of using a raw material obtained by compounding polybutene in advance using a Banbury kneader or the like, and a method of injecting the polybutene into an extruder.
- the concentration of polybutene is 0.5 to 20% by weight, and may be added to all three layers of the base film, only both outer layers (layer A and layer C), or only the intermediate layer (layer B), and the sealant It may be added to all layers of the film (Layer D, Layer E and Layer F) or to any layer (eg Layer F only).
- the polybutene commercially available products such as HV35 manufactured by Nippon Petrochemical Co., Ltd. and polybutene 100H manufactured by Idemitsu Petrochemical Co., Ltd. may be used.
- the surface of the base film on the layer C side may be subjected to corona treatment ( corona treatment of the surface of layer C).
- corona treatment corona treatment of the surface of layer C.
- barrier layer for example, layers such as silicon oxide, alumina, and spinel are preferably formed by vapor deposition.
- a barrier layer formed from a composition containing an inorganic stratiform compound and a polyvinyl alcohol-based resin may be formed by applying the composition and drying it.
- the method of laminating the base film (Layer A/Layer B/Layer C) and the sealant film (Layer D/Layer E or Layer D/Layer F/Layer E) is appropriately determined depending on whether an adhesive layer is formed. Good choice.
- a method of laminating preformed sealant films by a dry lamination method or an extrusion lamination method can be used.
- a water-based or solvent-based dry lamination adhesive is applied to the corona-treated surface of the layer C of the base film or the surface on the barrier layer side, and dried to form an adhesive layer.
- the layer C of the base film and the layer D of the sealant film can be bonded together by a dry lamination method.
- the surface of the layer D of the sealant film facing the base film is preferably subjected to corona treatment in the same manner as the layer C of the base film (the step of corona-treating the surface of the layer D).
- a non-solvent laminating adhesive is melt extruded between the layer C or barrier layer of the base film and the layer D of the sealant film to form an adhesive layer.
- the layer C of the base film and the layer D of the sealant film can be bonded together via the adhesive layer.
- layer D and layer E, or layer D, layer F and layer E may be formed by a non-solvent lamination method, and ethylene polymer may be formed on layer C or barrier layer of the base film.
- a layer F containing an ethylene polymer (F) can be melt extruded to form a sealant layer.
- a laminated film according to an aspect of the present invention has high rigidity and heat shrinkage resistance without laminating a polyethylene terephthalate (PET) film or a polyamide film, for example. Therefore, the laminated film according to one aspect can be suitably used, for example, as packaging bags and packaging containers for storing foods, detergents, cosmetics, and the like.
- the base material layer and the sealant layer can be molded from an ethylene polymer, it can be suitably used as a reusable monomaterial packaging material without separating the base material layer and the sealant layer.
- the laminated film according to one aspect of the present invention may be recovered and recycled after being used as a container for foods, detergents, cosmetics, and the like, for example.
- the laminated film can be recycled, for example, by washing the recovered container with a solvent such as water or alcohol, drying the container, and then melting and pelletizing the container. Melting and pelletizing of the container can be done without separating all layers of the laminated film.
- the obtained pellets may be mixed with an ethylene polymer masterbatch having a different inorganic filler content and melted to adjust the concentration of the inorganic filler. Any one of ethylene polymer (A), ethylene polymer (B), ethylene polymer (C), and ethylene polymer (D) may be selected as the ethylene polymer used in the masterbatch.
- a resin material containing a recycled ethylene polymer can be suitably used, for example, as a molding material for foods, detergents, and cosmetics.
- K1S Log (Io1S/I1S)/density of standard sample/sheet thickness ( ⁇ m)
- K2S Log (Io2S/I2S)/density of standard sample/sheet thickness ( ⁇ m)
- CH3/1000C 0.67 ⁇ f ⁇ ((K1) ⁇ 0.95 ⁇ (K2)+3.8)
- K1 Log (Io1/I1)/sample density/sheet thickness ( ⁇ m)
- K2 Log (Io2/I2)/sample density/sheet thickness ( ⁇ m)
- the short chain branch is propylene, the value obtained by multiplying the obtained CH3/1000C by 0.60, in the case of hexene, the value obtained by multiplying the obtained CH3/1000C by 1.13. In the case of octene, the obtained CH3/1000C is multiplied by 1.10, and in the case of 4-methylpentene 1, the obtained CH3/1000C is multiplied by 0.62.
- Inorganic filler 1 Talc trade name “JM620P” manufactured by Asada Flour Milling Co., Ltd., median diameter (d50) 5 ⁇ m
- Adhesive/Adhesive 1 Adhesive for dry lamination (manufacturing method: 12 parts by mass of Takelac (registered trademark) A310 (manufactured by Mitsui Chemicals), 1 part by mass of Takenate (registered trademark) A-3 (manufactured by Mitsui Chemicals), and 32 parts by mass of acetic acid (obtained by mixing with ethyl)
- the energy was calculated from the area of the tension-stress curve obtained by the impact strength test and divided by the cross-sectional area of the test piece to obtain the impact strength.
- a test piece in the MD direction was cut so that the feeding direction during film production coincided with the long side direction of the test piece.
- Each part was set on a chuck of a tensile tester (manufactured by Orientec Co., Ltd.) and peeled at 23° C., humidity of 50%, peel speed of 200 mm/min, peel angle of 180 degrees, and heat seal peel strength was measured.
- the temperature of the heat seal bar was 140°C, and the above test was conducted.
- Example 1 30 parts by mass of ethylene polymer 1, 70 parts by mass of inorganic filler 1, 0.2 parts by mass of lubricant 1, and 0.2 parts by mass of antioxidant 1 were mixed in a super mixer (manufactured by Kawata Co., Ltd., A mixture was obtained by stirring at a temperature of 190° C. under a nitrogen gas atmosphere. The resulting mixture was melt-kneaded using a co-directional twin-screw extruder (manufactured by Kobe Steel, Ltd., trade name “KTX-37”, screw diameter 37 mm ⁇ ) at a temperature of 220 to 240° C. and a screw rotation speed of 100 rpm. , to obtain a masterbatch pellet 1 (MB1).
- a super mixer manufactured by Kawata Co., Ltd., A mixture was obtained by stirring at a temperature of 190° C. under a nitrogen gas atmosphere. The resulting mixture was melt-kneaded using a co-directional twin-screw extruder (manufacture
- Layer D ethylene polymer 3; 95 parts by mass, masterbatch pellet 1; 5 parts by mass, thickness; 80 ⁇ m
- Layer E ethylene weight A two-layer blown film having a layer structure of coalescence 4: 100 parts by mass, thickness: 40 ⁇ m was formed.
- Molding conditions and corona treatment conditions were as follows. ⁇ Molding conditions> ⁇ Extruder: ⁇ 50mm x 3 units ⁇ Die: ⁇ 150mm, lip 2.0mmt ⁇ Set temperature of die: 180-190°C ⁇ Processing temperature of layer D: 180 to 190 ° C.
- the corona-treated surface of the T-die film 1 and the corona-treated surface of the blown film 1 are bonded together by a dry lamination method via a dry lamination adhesive 1 to form Layer A/Layer B/Layer C.
- a laminate film 1 having a six-layer structure of /adhesive layer/layer D/layer E was obtained.
- Example 2 The same as in Example 1 except that a mixture obtained by dry blending 95 parts by mass of ethylene polymer 2 and 5 parts by mass of masterbatch pellets 1 was used as layer A instead of 100 parts by mass of ethylene polymer 2.
- a T-die film 2 (TF2) was obtained under the conditions.
- the corona-treated surface of the T-die film 2 and the corona-treated surface of the blown film 1 are bonded together by a dry lamination method via a dry lamination adhesive 1 to form a layer A/layer B/layer C.
- a laminate film 2 having a six-layer structure of /adhesive layer/layer D/layer E was obtained.
- Example 3 As layer D, instead of ethylene polymer 3; 95 parts by mass and masterbatch pellets 1; 5 parts by mass, ethylene polymer 3; 93 parts by mass and masterbatch pellets 1; 7 parts by mass were used. A blown film 2 (IF2) was obtained in the same manner as in 1, and a laminated film 3 was obtained.
- IF2 blown film 2
- Example 4 As layer D, instead of ethylene polymer 3; 95 parts by mass and masterbatch pellets 1; 5 parts by mass, ethylene polymer 3; 86 parts by mass and masterbatch pellets 1; 14 parts by mass were used. A blown film 3 (IF3) was obtained in the same manner as in 1, and a laminated film 4 was obtained.
- IF3 blown film 3
- Example 5 As layer D, instead of ethylene polymer 3; 95 parts by mass and masterbatch pellets 1; 5 parts by mass, ethylene polymer 3; 79 parts by mass and masterbatch pellets 1; 21 parts by mass were used. A blown film 4 (IF4) was obtained in the same manner as in 1, and a laminated film 5 was obtained.
- IF4 blown film 4
- Example 6 Layer D (ethylene polymer 3; 95 parts by mass, masterbatch pellet 1; 5 parts by mass, thickness; 40 ⁇ m) / Layer F (ethylene weight 50 parts by mass of coalescence, 50 parts by mass of ethylene polymer, 40 ⁇ m in thickness)/layer E (4: 100 parts by mass of ethylene polymer, 40 ⁇ m in thickness) to form a three-layer inflation film. bottom. Then, the surface of the obtained film on the layer D side was subjected to corona treatment under the same conditions as for the blown film 1 to obtain the blown film 5 .
- Layer D ethylene polymer 3; 95 parts by mass, masterbatch pellet 1; 5 parts by mass, thickness; 40 ⁇ m
- Layer F ethylene weight 50 parts by mass of coalescence, 50 parts by mass of ethylene polymer, 40 ⁇ m in thickness
- layer E (4: 100 parts by mass of ethylene polymer, 40 ⁇ m in thickness)
- ⁇ Molding conditions> ⁇ Extruder: ⁇ 50mm x 3 units ⁇ Die: ⁇ 150mm, lip 2.0mmt ⁇ Set temperature of die: 180-190°C ⁇ Processing temperature of layer D: 180 to 190 ° C.
- the corona-treated surface of the T-die film 1 and the corona-treated surface of the blown film 5 are bonded together via the dry lamination adhesive 1 by a dry lamination method to form Layer A/Layer B/Layer C.
- a laminate film 6 having a seven-layer structure of /adhesive layer/layer D/layer F/layer E was obtained.
- Example 7 Inflation film 6 (IF6) was obtained in the same manner as in Example 6, except that ethylene polymer 7; 100 parts by mass was used as layer E instead of ethylene polymer 4; 100 parts by mass. got 7.
- the corona-treated surface of the T-die film 1 and the corona-treated surface of the blown film 8 are bonded together by a dry lamination method via the dry lamination adhesive 1 to form Layer A/Layer B/Layer C.
- a laminate film 9 having a five-layer structure of /adhesive layer/layer D was obtained.
- Table 1 shows the components and layer structures of T-die films (TF) 1 and 2.
- Table 2 shows the components and layer structures of blown films (IF) 1 to 4.
- Table 3 shows the components and layer structures of blown films (IF) 5 to 8.
- Table 4 shows the evaluation results of the components, layer structures and physical properties of laminated films 1 to 9.
- Example 8 As Layer D, instead of ethylene polymer 3; 95 parts by mass and masterbatch pellet 1; 5 parts by mass, ethylene polymer 3; 99 parts by mass and masterbatch pellet 1; 1 part by mass were used. A blown film 9 (IF9) was obtained in the same manner as in 1, and a laminated film 10 was obtained.
- IF9 blown film 9
- Example 9 As layer D, instead of ethylene polymer 3; 95 parts by mass and masterbatch pellets 1; 5 parts by mass, ethylene polymer 3; 97 parts by mass and masterbatch pellets 1; 3 parts by mass were used. A blown film 10 (IF10) was obtained in the same manner as in 1, and a laminated film 11 was obtained.
- IF10 blown film 10
- Table 5 shows blown film (IF) 9 and 10 components and layer configurations.
- Table 6 shows the evaluation results of the components, layer structures and physical properties of the laminated films 10 and 11.
- the laminated film according to one aspect of the present invention exhibits good impact strength and is suitably used for various packaging materials suitable for material recycling, such as food packaging materials.
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Abstract
Description
エチレンに由来する構造単位を80モル%以上含むエチレン重合体(A)を含有する層Aと、
エチレンに由来する構造単位を70モル%以上含むエチレン重合体(B)と、無機フィラー(A)とを含有する層Bと、
エチレンに由来する構造単位を70モル%以上含むエチレン重合体(C)を含有する層Cと、
バリア層及び接着層からなる群から選ばれる1種以上の層と、
エチレンに由来する構造単位を70モル%以上含むエチレン重合体(D)と、無機フィラー(B)とを含有し、エチレン重合体(D)及び無機フィラー(B)の合計含有量100質量%に対して、エチレン重合体(D)の含有量が75質量%以上99.5質量%未満であり、無機フィラー(B)の含有量が0.5質量%以上25質量%未満である層Dと、
エチレンに由来する構造単位を70モル%以上含むエチレン重合体(E)を含有する層Eを有し、
層A/層B/層C/バリア層/層D/層Eの順、
層A/層B/層C/接着層/層D/層Eの順、
層A/層B/層C/バリア層/接着層/層D/層Eの順、
層A/層B/層C/接着層/バリア層/層D/層Eの順のうちのいずれかの順で積層されてなる。
本態様一態様に係る積層フィルムは、エチレン重合体(A)を含有する層Aと、エチレン重合体(B)及び無機フィラー(A)を含有する層Bと、エチレン重合体(C)を含有する層Cと、バリア層及び接着層からなる群から選ばれる1種以上の層と、エチレン重合体(D)及び無機フィラー(B)を含有する層Dと、エチレン重合体(E)を含有する層Eとがこの順に積層され、層Cと層Dとの間にバリア層及び接着層から選択される少なくとも1つの層が積層されてなる。
基材フィルムは、エチレン重合体(A)を含有する層Aと、エチレン重合体(B)及び無機フィラーを含有する層Bと、エチレン重合体(C)を含有する層Cとがこの順に積層してなるフィルムであり、層Aが外層、層Bが中間層、層Cが内層であり得る。エチレン重合体(A)、エチレン重合体(B)、及びエチレン重合体(C)は、それぞれ、エチレン重合体におけるエチレンに由来する単量体単位のモル分率、密度、及びメルトフローレート(MFR)によって選択され得る。基材フィルムは、すくなくとも層Bに無機フィラーを含む。また、基材フィルムを構成する各層A、層B及び層Cは、必要に応じて添加剤を含んでいてもよい。
〔1-1-1〕エチレンに由来する単量体単位のモル分率
エチレンに由来する単量体単位のモル分率は、例えば、FT-IR法、NMR法により求めることができる。
エチレン重合体(A)、エチレン重合体(B)及びエチレン重合体(C)の密度は、JIS K6760-1995に規定されたアニーリング処理を行った後、JIS K7112-1980に記載のA法に従って測定される。
エチレン重合体(A)、エチレン重合体(B)、及びエチレン重合体(C)のメルトフローレート(MFR)は、JIS K7210-1―2014に準拠し、温度190℃、荷重21.18Nで測定される。
エチレン重合体(A)、エチレン重合体(B)及びエチレン重合体(C)には、それぞれ、高圧法低密度ポリエチレン、高密度ポリエチレン、エチレン-α-オレフィン共重合体、エチレン-ビニルエステル共重合体、エチレン-不飽和カルボン酸エステル共重合体等のエチレン重合体を用いることができる。
(2)前記遷移金属化合物を含む成分と、トリチルボレート、アニリニウムボレート等のイオン性化合物とを含む成分からなる触媒
(3)前記遷移金属化合物を含む成分と、前記イオン性化合物を含む成分と、有機金属化合物とを含む成分からなる触媒
(4)前記の各成分をSiO2、Al2O3等の無機粒子状担体や、エチレン、スチレン等のオレフィン重合体等の粒子状ポリマー担体に担持または含浸させて得られる触媒
上記の有機金属化合物としては、例えば、ブチルリチウム、トリエチルアルミニウム等が挙げられる。
基材フィルムは、少なくとも層Bに無機フィラー(A)を含む。層Bにおける無機フィラーの含有量は、エチレン重合体(B)及び前記無機フィラー(A)の合計含有量100質量%に対して、20質量%~80質量%であることが好ましく、30質量%~70質量%であることがより好ましい。層Bにおける無機フィラー(A)の含有量が20質量%以上であることによって、例えば、ポリエチレンテレフタレート(PET)フィルム、及びポリアミドフィルム等のフィルムを基材フィルムに積層しなくても、基材フィルム、さらには基材フィルムにシーラントフィルムを積層した積層フィルムに高い剛性及び高い耐熱収縮性を付与することができる。このため、基材フィルム及び積層フィルムを再生するときにおいて、ポリエチレンテレフタレート(PET)フィルム、及びポリアミドフィルム等を分離する必要がない。よって、基材フィルム、及び積層フィルムをエチレン重合体と無機フィラーとの成形材料用組成物として好適に再生することができる。なお、層Bにおける無機フィラー(A)の含有量が、80質量%以下であれば、層A及び層Cと首尾よく共押出することができ、基材フィルムを首尾よく成形することができる。
層A、層B及び層Cは、必要に応じて、本発明の目的・効果を損なわない範囲で、少なくとも1つの添加剤を含んでいてもよい。
バリア層及び接着層からなる群から選ばれる1種以上の層は、層Cと層Dとの間に位置する層であって、バリア層または接着層のいずれかの単一層であっても、バリア層と接着層とを含む多層であってもよい。
シーラントフィルムは、エチレン重合体(D)及び無機フィラー(B)を含有する層Dと、エチレン重合体(E)を含有する層Eとがこの順に積層してなるフィルムであり、層Dが内層、層Eが外層であり得る。シーラントフィルムがエチレン重合体(D)及び無機フィラー(B)を含有する層Dと、エチレン重合体(E)を含有する層Eを有することにより、積層フィルムにおける衝撃強度と、ヒートシール剥離強度とを両立させることができる。
〔3-1-1〕エチレンに由来する単量体単位のモル分率
層Dが含有するエチレン重合体(D)は、エチレンに由来する構造単位を70モル%以上、好ましくは90モル%以上含み得る。エチレン重合体(D)は、100モル%のエチレンに由来する構造単位により構成されていてもよい。なお、層Dはエチレン重合体(D)の他に、後述するエチレン重合体(G)及び/又はエチレン重合体(G)以外のエチレン重合体を含んでいてもよい。
エチレン重合体(A)~(C)と同じく、エチレン重合体(D)、エチレン重合体(E)、エチレン重合体(F)、及びエチレン重合体(G)の密度は、JIS K6760-1995に規定されたアニーリング処理を行った後、JIS K7112-1980に記載のA法に従って測定される。
エチレン重合体(D)、エチレン重合体(E)、エチレン重合体(F)、及びエチレン重合体(G)のメルトフローレート(MFR)はエチレン重合体(A)等と同じく、JIS K7210-1―2014に準拠し、温度190℃、荷重21.18Nで測定される。
エチレン重合体(D)、エチレン重合体(E)、エチレン重合体(F)及びエチレン重合体(G)には、それぞれ、高圧法低密度ポリエチレン、高密度ポリエチレン、エチレン-α-オレフィン共重合体、エチレン-ビニルエステル共重合体、エチレン-不飽和カルボン酸エステル共重合体等のエチレン重合体を用いることができる。
シーラント層は、すくなくとも層Dに無機フィラー(B)を含む。層Dにおける無機フィラーの含有量は、エチレン重合体(D)及び前記無機フィラー(B)の合計含有量100質量%に対して、エチレン重合体(D)の含有量が75質量%以上99.5質量%未満であり、無機フィラー(B)の含有量が0.5質量%以上25質量%未満である。層Dに含まれる無機フィラー(B)の含有量は0.5質量%以上であり、1質量%以上であることが好ましく、1.5質量%以上であることがより好ましく、2質量%以上であることがさらに好ましく、25質量%未満であるとよい。層Dにおける無機フィラーの含有量が0.5質量%以上であり、25質量%未満であることにより、層Dと、基材フィルムとの密着性を維持しつつ、積層フィルムの衝撃強度を高めることができる。
層D、層E、及び層Fは、それぞれ必要に応じて、本発明の目的・効果を損なわない範囲で、少なくとも1つの添加剤を含んでいてもよい。添加剤としては、層A、層B、層Cと同じく、滑剤、安定剤(酸化防止剤)、界面活性剤、帯電防止剤、加工性改良剤、抗ブロッキング剤、及び染料等が挙げられる。
本実施形態に係る積層フィルムは、層Aと、層Bと、層Cとがこの順で積層されてなる基材フィルム(層A/層B/層C)の、層C側の表面をコロナ処理する工程と、基材フィルムの層C側のコロナ処理を行なった面に、バリア層及び接着層からなる群から選ばれる1種以上の層を介して、シーラントフィルムを積層する工程と、を含む製造方法により、製造することができる。
本発明の一態様に係る積層フィルムは、例えば、ポリエチレンテレフタレート(PET)フィルムやポリアミドフィルムを積層せずとも、高い剛性及び耐熱収縮性を備えている。よって、一態様に係る積層フィルムは、例えば、食品、洗剤、及び化粧品等を収納する包装袋、及び包装用容器として好適に用いることができる。また、基材層及びシーラント層をエチレン重合体によって成形することができることから、基材層及びシーラント層と分離せずとも、再利用するができるモノマテリアル包材として好適に使用することができる。
本発明の一態様に係る積層フィルムは、例えば、食品、洗剤、及び化粧品等の容器として用いた後、回収し、再生するとよい。積層フィルムの再生は、例えば、水やアルコール等の溶剤等によって回収した容器を洗浄し、乾燥した後に当該容器を溶融し、ペレット化すればよい。容器の溶融、及びペレット化は、積層フィルムの全層を分離することなく行うことができる。得られたペレットと、当該ペレットとは、無機フィラーの含有量が異なるエチレン重合体のマスターバッチとを混合し、溶融し、無機フィラーの濃度を調整してもよい。当該マスターバッチに用いられるエチレン重合体は、エチレン重合体(A)、エチレン重合体(B)、エチレン重合体(C)、エチレン重合体(D)の何れかを選択すればよい。
(1-1)エチレン重合体中のエチレンに由来する構造単位の含有量(単位:モル%) 短鎖分岐数が既知のエチレンーヘキセン共重合体の標準サンプルについて、100μmのプレスシートを作成し、日本分光社製FT-IR480にて、積算回数16回、分解4cm-1にて赤外線吸収強度を測定した。得られたスペクトルの1700cm-1と920cm-1を結びベースラインを作成した。得られたスペクトルの1378cm-1のピーク強度(I1S)と1303cm-1のピーク強度(I2S)、またベースラインの1378cm-1のピーク強度(Io1S)と1303cm-1のピーク強度(Io2S)をそれぞれ読み取り、以下の式を用いて、係数fを求めた。
f=(標準サンプルの1000C中の短鎖分岐数)/0.67{(K1S)-0.95(K2S)+3.8}
K1S=Log(Io1S/I1S)/標準サンプルの密度/シート厚み(μm)
K2S=Log(Io2S/I2S)/標準サンプルの密度/シート厚み(μm)
次に、短鎖分岐数が未知のサンプルについて、100μmのプレスシートを作成し、日本分光社製FT-IR480にて、積算回数16回、分解4cm-1にて赤外線吸収強度を測定した。得られたスペクトルの1700cm-1と920cm-1を結びベースラインを作成した。得られたスペクトルの1378cm-1のピーク強度(I1)と1303cm-1のピーク強度(I2)、またベースラインの1378cm-1のピーク強度(Io1)と1303cm-1のピーク強度(Io2)をそれぞれ読み取り、以下の式を用いてCH3/1000Cを算出した。
CH3/1000C=0.67×f×((K1)-0.95×(K2)+3.8)
K1=Log(Io1/I1)/サンプルの密度/シート厚み(μm)
K2=Log(Io2/I2)/サンプルの密度/シート厚み(μm)
短鎖分岐がプロピレンの場合は、得られたCH3/1000Cに対し0.60倍した値を、ヘキセンの場合は、得られたCH3/1000Cに対し1.13倍した値を、短鎖分岐がオクテンの場合は、得られたCH3/1000Cに対し1.10倍した値を、短鎖分岐が4メチルペンテン1の場合は、得られたCH3/1000Cに対し0.62倍した値を、短鎖分岐がプロピレン、ヘキセン、オクテン、4メチルペンテン以外の場合は、得られたCH3/1000の値を、1000炭素中の短鎖分岐度とした。
エチレン重合体中のエチレンに由来する構造単位の含有量は、1000炭素中の短差分岐度を用いて、以下式にて算出した。
エチレン重合体中のエチレンに由来する構造単位の含有量(モル%)=(1000-1000炭素中の短鎖分岐度)/10
JIS K6760-1995に記載のアニーリング処理を行った後、JIS K7112-1980に記載のA法に従って、エチレン重合体の密度(単位:kg/m3)を測定した。
JIS K7210-1―2014に従い、温度190℃、荷重21.18Nの条件でエチレン重合体のMFR(単位:g/10分)を測定した。
(2-1)エチレン重合体
・エチレン重合体1
エチレン-α-オレフィン共重合体、京葉ポリエチレン株式会社製 商品名「G2500」、エチレンに由来する構造単位:99.2モル%、密度:960kg/m3、MFR:5g/10分
・エチレン重合体2
エチレン-α-オレフィン共重合体、京葉ポリエチレン株式会社製 商品名「E8080」、エチレンに由来する構造単位:99.1モル%、密度:958kg/m3、MFR:1.0g/10分
・エチレン重合体3
エチレン-ヘキセン共重合体、住友化学株式会社製 商品名「スミカセンE(登録商標)FV205」、製造方法:メタロセン触媒を用いた気相重合、エチレンに由来する構造単位:98.9モル%、密度:921kg/m3、MFR:2.2g/10分
・エチレン重合体4
エチレン-ヘキセン共重合体、住友化学株式会社製 商品名「エクセレンFX(登録商標)FX307」、製造方法:メタロセン触媒を用いた気相重合、エチレンに由来する構造単位:95.5モル%、密度:890kg/m3、MFR:3.2g/10分
・エチレン重合体5
エチレン-ヘキセン共重合体、住友化学株式会社製 商品名「スミカセンE(登録商標)FV104」、製造方法:メタロセン触媒を用いた気相重合、エチレンに由来する構造単位:98.0モル%、密度:915kg/m3、MFR:1.0g/10分
・エチレン重合体6
エチレン-ヘキセン共重合体、住友化学株式会社製 商品名「エクセレンGMH(登録商標)GH030」、製造方法:メタロセン触媒を用いた気相重合、エチレンに由来する構造単位:96.9モル%、密度:912kg/m3、MFR:0.5g/10分
・エチレン重合体7
エチレン-ヘキセン共重合体、住友化学株式会社製 商品名「スミカセンE(登録商標)FV201」、製造方法:メタロセン触媒を用いた気相重合、エチレンに由来する構造単位:98.1モル%、密度:916kg/m3、MFR:2.3g/10分
タルク、浅田製粉株式会社製 商品名「JM620P」、メディアン径(d50)5μm
・接着剤1
ドライラミネート用接着剤(製造方法:12質量部のタケラック(登録商標)A310(三井化学製)と、1質量部のタケネート(登録商標)A―3(三井化学製)と、32質量部の酢酸エチルとを混合して得た)
(3-1)衝撃強度(単位:kJ/m2)
フィルムをASTM TypeSダンベルにて打ち抜き、63.5mm×9.5mmの衝撃強度評価用の試験片を得た。株式会社オリエンテック製衝撃試験装置(CIT-150-T-20)を用いて、23℃、湿度50%の雰囲気下、つかみ間隔20mm、ハンマー呼称エネルギー15kgf・cm、ハンマー振り上げ角度150°、衝撃速度3.8m/秒の条件で試験片の衝撃強度試験を行った。衝撃強度試験により得られた引張-応力カーブの面積からエネルギーを算出し、試験片の断面積で除して、衝撃強度を求めた。なお、フィルム製造時にける送り出し方向と、試験片の長辺方向とが一致するように切り出したものをMD方向の試験片とした。
同じフィルム同士を重ね合わせ、10mm幅のヒートシールバーが装着されたヒートシーラー(テスター産業(株)製TP-701S)で、ヒートシールバーの方向をフィルムのTD方向に合わせて、所定のヒートシールバー温度及び1kPaの圧力で、1秒間、上記フィルム同士を圧着してヒートシールを行った。ヒートシール後のフィルムを一昼夜、23℃、湿度50%で状態調整した後、ヒートシール部の幅が15mmとなるようにフィルムを切り出し、ヒートシールされた2枚のフィルムの対向している非シール部分をそれぞれ引張試験機((株)オリエンテック製)のチャックにセットし、23℃、湿度50%、剥離速度200mm/分、剥離角度180度で剥離し、ヒートシール剥離強度を測定した。ヒートシールバーの温度は、140℃において上記試験を行った。
30質量部のエチレン重合体1と、70質量部の無機フィラー1と、0.2質量部の滑剤1と、0.2質量部の酸化防止剤1とを、スーパーミキサー(株式会社カワタ製、商品名「SMV-100」)を用いて窒素ガス雰囲気下、温度190℃で撹拌して、混合物を得た。得られた混合物を、同方向二軸押出機(株式会社神戸製鋼所製、商品名「KTX-37」、スクリュー径37mmφ)を用いて、温度220~240℃、スクリュー回転数100rpmで溶融混練し、マスターバッチペレット1(MB1)を得た。
<成形条件>
・押出機:φ50mm×2台、φ40mm×1台
・ダイ開口長:600mm
・リップ:1.2mm
・層Aの加工温度:230℃
・層Aの押出条件:2.5kg/時間
・層Bの加工温度:210℃
・層Bの押出条件:5kg/時間
・層Cの加工温度:230℃
・層Cの押出条件:2.5kg/時間
<コロナ処理条件>
・コロナ処理器:ウェッジ製 AGF-B 10型
・コロナ出力:0.15kW
<成形条件>
・押出機:φ50mm×3台
・ダイ:φ150mm、リップ2.0mmt
・ダイの設定温度:180~190℃
・層Dの加工温度:180~190℃
・層Dの押出条件:20kg/時
・層Eの加工温度:180~190℃
・層Eの押出条件:10kg/時
・折径:470mm
<コロナ処理条件>
・コロナ処理器:ウェッジ製 AGF-B 10型
・コロナ出力:0.2kW
層Aとして、100質量部のエチレン重合体2に代えて、95質量部のエチレン重合体2と5質量部のマスターバッチペレット1とをドライブレンドした混合物を用いた以外は、実施例1と同じ条件にて、Tダイフィルム2(TF2)を得た。
層Dとして、エチレン重合体3;95質量部、マスターバッチペレット1;5質量部に代えて、エチレン重合体3;93質量部、マスターバッチペレット1;7質量部を用いた以外は、実施例1と同様にして、インフレーションフィルム2(IF2)を得て、積層フィルム3を得た。
層Dとして、エチレン重合体3;95質量部、マスターバッチペレット1;5質量部に代えて、エチレン重合体3;86質量部、マスターバッチペレット1;14質量部を用いた以外は、実施例1と同様にして、インフレーションフィルム3(IF3)を得て、積層フィルム4を得た。
層Dとして、エチレン重合体3;95質量部、マスターバッチペレット1;5質量部に代えて、エチレン重合体3;79質量部、マスターバッチペレット1;21質量部を用いた以外は、実施例1と同様にして、インフレーションフィルム4(IF4)を得て、積層フィルム5を得た。
3層共押出インフレーションフィルム成形機(株式会社プラコー製)を用いて、層D(エチレン重合体3;95質量部、マスターバッチペレット1;5質量部、厚さ;40μm)/層F(エチレン重合体5;50質量部、エチレン重合体6;50質量部、厚さ;40μm)/層E(エチレン重合体4;100質量部、厚さ;40μm)の層構成を有する3層インフレーションフィルムを成形した。次いで、得られたフィルムの層D側の表面にインフレーションフィルム1と同様の条件でコロナ処理を行い、インフレーションフィルム5を得た。
<成形条件>
・押出機:φ50mm×3台
・ダイ:φ150mm、リップ2.0mmt
・ダイの設定温度:180~190℃
・層Dの加工温度:180~190℃
・層Dの押出条件:10kg/時間
・層Fの加工温度:180~190℃
・層Fの押出条件:10kg/時間
・層Eの加工温度:180~190℃
・層Eの押出条件:10kg/時間
・折径:470mm
層Eとして、エチレン重合体4;100質量部に代えて、エチレン重合体7;100質量部を用いた以外は、実施例6と同様にして、インフレーションフィルム6(IF6)を得て、積層フィルム7を得た。
層Dとして、エチレン重合体3;95質量部、マスターバッチペレット1;5質量部に代えて、エチレン重合体3;57質量部、マスターバッチペレット1;43質量部を用いた以外は、実施例1と同様にして、インフレーションフィルム7(IF7)を得て、積層フィルム8を得た。
3層共押出インフレーションフィルム成形機(株式会社プラコー製)を用いて、層D(エチレン重合体7;100質量部、厚さ;120μm)の層構成を有するインフレーションフィルム8(IF8)を成形した。次いで、得られたインフレーションフィルム8の表面にインフレーションフィルム1と同様の条件でコロナ処理を行った。
<成形条件>
・押出機:φ50mm×3台
・ダイ:φ150mm、リップ2.0mmt
・ダイの設定温度:180~190℃
・層Dの加工温度:180~190℃
・層Dの押出条件:30kg/時
・折径:470mm
インフレーションフィルム(IF)1~4の成分及び層構成を表2に示す。
インフレーションフィルム(IF)5~8の成分及び層構成を表3に示す。
積層フィルム1~9の成分、層構成及び物性の評価結果を表4に示す。
層Dとして、エチレン重合体3;95質量部、マスターバッチペレット1;5質量部に代えて、エチレン重合体3;99質量部、マスターバッチペレット1;1質量部を用いた以外は、実施例1と同様にして、インフレーションフィルム9(IF9)を得て、積層フィルム10を得た。
層Dとして、エチレン重合体3;95質量部、マスターバッチペレット1;5質量部に代えて、エチレン重合体3;97質量部、マスターバッチペレット1;3質量部を用いた以外は、実施例1と同様にして、インフレーションフィルム10(IF10)を得て、積層フィルム11を得た。
積層フィルム10及び11の成分、層構成及び物性の評価結果を表6に示す。
Claims (10)
- エチレンに由来する構造単位を80モル%以上含むエチレン重合体(A)を含有する層Aと、
エチレンに由来する構造単位を70モル%以上含むエチレン重合体(B)と、無機フィラー(A)とを含有する層Bと、
エチレンに由来する構造単位を70モル%以上含むエチレン重合体(C)を含有する層Cと、
バリア層及び接着層からなる群から選ばれる1種以上の層と、
エチレンに由来する構造単位を70モル%以上含むエチレン重合体(D)と、無機フィラー(B)とを含有し、前記エチレン重合体(D)及び前記無機フィラー(B)の合計含有量100質量%に対して、前記エチレン重合体(D)の含有量が75質量%以上99.5質量%未満であり、前記無機フィラー(B)の含有量が0.5質量%以上25質量%未満である層Dと、
エチレンに由来する構造単位を70モル%以上含むエチレン重合体(E)を含有する層Eを有し、
層A/層B/層C/バリア層/層D/層Eの順、
層A/層B/層C/接着層/層D/層Eの順、
層A/層B/層C/バリア層/接着層/層D/層Eの順、
層A/層B/層C/接着層/バリア層/層D/層Eの順のうちのいずれかの順で積層されてなる積層フィルム。 - 前記エチレン重合体(E)の密度が880kg/m3以上910kg/m3未満であり、温度190℃、荷重21.18Nで測定されるメルトフローレートが0.01g/10分以上5g/10分未満である、請求項1に記載の積層フィルム。
- 前記積層フィルムにおいて、層Dと層Eとの間に、エチレン重合体(F)を含有する層Fが積層されてなり、
前記エチレン重合体(F)の密度が910kg/m3以上930kg/m3未満である、請求項1または2に記載の積層フィルム。 - 前記層Dが、前記エチレン重合体(D)と、エチレン重合体(G)と、無機フィラー(B)とを含有し、
前記エチレン重合体(G)の密度が940kg/m3以上970kg/m3未満であり、
前記エチレン重合体(D)、及び前記無機フィラー(B)の合計含有量100質量部に対して、前記エチレン重合体(G)の含有量が0.1質量部以上20質量部以下である、請求項1~3のいずれか一項に記載の積層フィルム。 - 前記無機フィラー(A)及び前記無機フィラー(B)のそれぞれが、炭酸カルシウム、カオリン、メタカオリン、ハイドロタルサイト、マイカ、タルク及び繊維状塩基性硫酸マグネシウム粒子からなる群から選ばれる1種以上のフィラーである、請求項1~4のいずれか一項に記載の積層フィルム。
- 前記エチレン重合体(A)の密度が930kg/m3以上970kg/m3未満であり、温度190℃、荷重21.18Nで測定されるメルトフローレートが0.01g/10分以上、3g/10分未満であり、
前記エチレン重合体(B)の密度が930kg/m3以上970kg/m3未満であり、温度190℃、荷重21.18Nで測定されるメルトフローレートが3g/10分以上、25g/10分未満であり、
前記エチレン重合体(C)の密度が900kg/m3以上970kg/m3未満であり、温度190℃、荷重21.18Nで測定されるメルトフローレートが0.01g/10分以上、3g/10分未満であり、
前記エチレン重合体(D)の密度が900kg/m3以上930kg/m3未満であり、温度190℃、荷重21.18Nで測定されるメルトフローレートが0.01g/10分以上、3g/10分未満であり、
前記エチレン重合体(E)の密度が880kg/m3以上930kg/m3未満であり、温度190℃、荷重21.18Nで測定されるメルトフローレートが0.01g/10分以上、3g/10分未満である、請求項1~5のいずれか一項に記載の積層フィルム。 - 前記層Aの厚さが5μm以上30μm以下であり、
前記層Bの厚さが10μm以上60μm以下であり、
前記層Cの厚さが5μm以上30μm以下である、請求項1~6のいずれか一項に記載の積層フィルム。 - 前記層Dの厚さが10μm以上150μm以下であり、前記層Eの厚さが10μm以上150μm以下である、請求項1~7のいずれか一項に記載の積層フィルム。
- 前記バリア層が酸化ケイ素、アルミナ、スピネル、ポリビニルアルコール系樹脂と無機層状鉱物の組成物からなる群から選ばれる1種以上のバリア剤を含むバリア層であり、
前記接着層がポリウレタン系接着剤、ポリエステル系接着剤、イミン系接着剤及びチタネート系接着剤からなる群から選ばれる1種以上の接着剤を含む接着層である、請求項1~8のいずれか一項に記載の積層フィルム。 - 前記層Cの表面をコロナ処理する工程及び前記層Dの表面をコロナ処理する工程を含む、請求項1~9のいずれか一項に記載の積層フィルムの製造方法。
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