NZ747556B2 - Multilayer cling film - Google Patents
Multilayer cling filmInfo
- Publication number
- NZ747556B2 NZ747556B2 NZ747556A NZ74755618A NZ747556B2 NZ 747556 B2 NZ747556 B2 NZ 747556B2 NZ 747556 A NZ747556 A NZ 747556A NZ 74755618 A NZ74755618 A NZ 74755618A NZ 747556 B2 NZ747556 B2 NZ 747556B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- film
- release layer
- layer
- less
- ethylene
- Prior art date
Links
- 239000000853 adhesive Substances 0.000 claims abstract description 32
- 230000001070 adhesive Effects 0.000 claims abstract description 32
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 12
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 9
- CXQXSVUQTKDNFP-UHFFFAOYSA-N Simethicone Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 5
- 235000013870 dimethyl polysiloxane Nutrition 0.000 claims abstract description 5
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 claims abstract description 5
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 5
- 229920001577 copolymer Polymers 0.000 claims description 30
- 229920001519 homopolymer Polymers 0.000 claims description 7
- 239000000314 lubricant Substances 0.000 claims description 7
- 229920000098 polyolefin Polymers 0.000 claims description 7
- 235000013305 food Nutrition 0.000 claims description 6
- 150000001408 amides Chemical class 0.000 claims description 4
- 239000000463 material Substances 0.000 description 30
- 229920000642 polymer Polymers 0.000 description 19
- 239000005977 Ethylene Substances 0.000 description 15
- VGGSQFUCUMXWEO-UHFFFAOYSA-N ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 15
- -1 polypropylene Polymers 0.000 description 13
- PPBRXRYQALVLMV-UHFFFAOYSA-N styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 12
- 239000004711 α-olefin Substances 0.000 description 11
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 9
- 239000004698 Polyethylene (PE) Substances 0.000 description 8
- 229920000573 polyethylene Polymers 0.000 description 8
- 239000004952 Polyamide Substances 0.000 description 7
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 7
- 229920001684 low density polyethylene Polymers 0.000 description 7
- 239000004702 low-density polyethylene Substances 0.000 description 7
- 229920002647 polyamide Polymers 0.000 description 7
- 239000005033 polyvinylidene chloride Substances 0.000 description 7
- 239000011528 polyamide (building material) Substances 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 5
- 239000004707 linear low-density polyethylene Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229920001155 polypropylene Polymers 0.000 description 5
- 229920000915 polyvinyl chloride Polymers 0.000 description 5
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 5
- XTXRWKRVRITETP-UHFFFAOYSA-N vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 5
- 239000004594 Masterbatch (MB) Substances 0.000 description 4
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 4
- 150000001336 alkenes Chemical class 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 230000003203 everyday Effects 0.000 description 4
- 229920000092 linear low density polyethylene Polymers 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 150000003505 terpenes Chemical class 0.000 description 4
- 235000007586 terpenes Nutrition 0.000 description 4
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 3
- 101700076513 KIN11 Proteins 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000000806 elastomer Substances 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 3
- 239000004700 high-density polyethylene Substances 0.000 description 3
- 229920000554 ionomer Polymers 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- LGXVIGDEPROXKC-UHFFFAOYSA-N 1,1-Dichloroethene Chemical compound ClC(Cl)=C LGXVIGDEPROXKC-UHFFFAOYSA-N 0.000 description 2
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L Calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 229920002292 Nylon 6 Polymers 0.000 description 2
- 229920002302 Nylon 6,6 Polymers 0.000 description 2
- FATBGEAMYMYZAF-KTKRTIGZSA-N Oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 2
- 229920001083 Polybutene Polymers 0.000 description 2
- 229920002367 Polyisobutene Polymers 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 239000004708 Very-low-density polyethylene Substances 0.000 description 2
- 229910052925 anhydrite Inorganic materials 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N diethyl ether Chemical group CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-M methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920005629 polypropylene homopolymer Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229920001897 terpolymer Polymers 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 229920001862 ultra low molecular weight polyethylene Polymers 0.000 description 2
- 229920001866 very low density polyethylene Polymers 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-Hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 1
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-Octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 1
- JTXMVXSTHSMVQF-UHFFFAOYSA-N 2-acetyloxyethyl acetate Chemical compound CC(=O)OCCOC(C)=O JTXMVXSTHSMVQF-UHFFFAOYSA-N 0.000 description 1
- KUDUQBURMYMBIJ-UHFFFAOYSA-N 2-prop-2-enoyloxyethyl prop-2-enoate Chemical compound C=CC(=O)OCCOC(=O)C=C KUDUQBURMYMBIJ-UHFFFAOYSA-N 0.000 description 1
- 229920003313 Bynel® Polymers 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate dianion Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- ORAWFNKFUWGRJG-UHFFFAOYSA-N Docosanamide Chemical compound CCCCCCCCCCCCCCCCCCCCCC(N)=O ORAWFNKFUWGRJG-UHFFFAOYSA-N 0.000 description 1
- STVZJERGLQHEKB-UHFFFAOYSA-N Ethylene glycol dimethacrylate Chemical compound CC(=C)C(=O)OCCOC(=O)C(C)=C STVZJERGLQHEKB-UHFFFAOYSA-N 0.000 description 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- 241001643597 Evas Species 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N Maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- VMRGZRVLZQSNHC-UHFFFAOYSA-N N-octadec-9-enylhexadecanamide Chemical compound CCCCCCCCCCCCCCCC(=O)NCCCCCCCCC=CCCCCCCCC VMRGZRVLZQSNHC-UHFFFAOYSA-N 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 229920000572 Nylon 6/12 Polymers 0.000 description 1
- 229920000034 Plastomer Polymers 0.000 description 1
- 229940037312 STEARAMIDE Drugs 0.000 description 1
- 229920003182 Surlyn® Polymers 0.000 description 1
- 239000005035 Surlyn® Substances 0.000 description 1
- 229920001567 Vinyl ester Polymers 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid Chemical compound OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000004840 adhesive resin Substances 0.000 description 1
- 125000005250 alkyl acrylate group Chemical group 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
- QYMGIIIPAFAFRX-UHFFFAOYSA-N butyl prop-2-enoate;ethene Chemical compound C=C.CCCCOC(=O)C=C QYMGIIIPAFAFRX-UHFFFAOYSA-N 0.000 description 1
- 230000001010 compromised Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 239000005043 ethylene-methyl acrylate Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 229920001112 grafted polyolefin Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002734 metacrylic acid derivatives Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 238000010094 polymer processing Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 1
- 229920005653 propylene-ethylene copolymer Polymers 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 125000005373 siloxane group Chemical group [SiH2](O*)* 0.000 description 1
- 230000003068 static Effects 0.000 description 1
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical group [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 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
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
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- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/246—All polymers belonging to those covered by groups B32B27/32 and B32B27/30
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2250/00—Layers arrangement
- B32B2250/44—Number of layers variable across the laminate
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/02—Synthetic macromolecular particles
- B32B2264/0214—Particles made of materials belonging to B32B27/00
- B32B2264/0264—Polyamide particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/51—Elastic
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- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/554—Wear resistance
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- B32—LAYERED PRODUCTS
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
- B32B2307/7244—Oxygen barrier
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- B32B2307/732—Dimensional properties
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- B32B2307/748—Releasability
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- B32B2331/00—Polyvinylesters
- B32B2331/04—Polymers of vinyl acetate, e.g. PVA
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- B32B2439/00—Containers; Receptacles
- B32B2439/02—Open containers
- B32B2439/06—Bags, sacks, sachets
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- 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
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- B32B27/00—Layered products comprising a layer of synthetic resin
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/283—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polysiloxanes
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- 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
- B32B7/06—Interconnection of layers permitting easy separation
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- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
Abstract
Existing kitchen wrap "cling film" have limitations in that they struggle meet all requirements relating to cost, environmentally friendly, sufficient self adhesion properties, handling properties such as unwinding and cutting, and ability to act as an effective barrier for odor. The present invention seeks to go someway towards addressing some of these problems seen in existing films by providing a film with thickness of less than 25 microns comprising a release layer and an inner adhesive layer, wherein the release layer of the film comprises from 0.1 to 10% by weight PDMS, wherein the adhesive layer comprises ethylene vinyl acetate copolymer, and wherein the kinetic coefficient of friction of the release layer surface of the film measured according to ASTM D 1894 (film to film measurement) is less 10 than 0.4 on seeks to go someway towards addressing some of these problems seen in existing films by providing a film with thickness of less than 25 microns comprising a release layer and an inner adhesive layer, wherein the release layer of the film comprises from 0.1 to 10% by weight PDMS, wherein the adhesive layer comprises ethylene vinyl acetate copolymer, and wherein the kinetic coefficient of friction of the release layer surface of the film measured according to ASTM D 1894 (film to film measurement) is less 10 than 0.4
Description
MULTILAYER CLING FILM
In the plastic film area a very well known type of film is the so called “cling film” or
en wrap”. This film is used by the layman in order to protect ready food from
spoilage in everyday kitchen use. Well known films of this type are the Saranex® film
in the US and similar films in Europe, Australia and Japan.
This kind of films in order to perform must combine a certain range of properties.
1. The films must have enough adhesiveness in order to cling to plastic kitchen
bowls (e.g. ware® type) so that the food stored is protected.
2. They must have enough elongation to be effectively used in practical everyday
applications.
3. They must be able to unwind easily during everyday use in the kitchen (films
are used in reel form wound around a paper or plastic core).
4. They must be able to be torn efficiently.
. They must be environmentally friendly and as thin as practically le
In the today state of the art, two basic films are used for this application. First one is
based on LLDPE r low density polyethylene) while the second is based on
PVDC (polyvinylidene chloride). Both have certain advantages and disadvantages.
LLDPE films are economical to manufacture, have enough cling properties and are
environmentally friendly. But on the other hand, they do not have odour barrier
properties and they are notoriously known for being difficult to cut and ult to
unwind. This type of film is the most common in Europe.
PVDC films are very difficult to e and are expensive and considered as non
environmentally friendly(due to chlorine presence in PVDC). They have excellent
odour barrier and acceptable cling properties.
Sometimes, instead of PVDC a PVC film is used. This on is not considered
viable in many s due to the phthalate plasticizers used in the tion process
of soft PVC. In general, the plasticizer migration from the film to the foods and the
chlorine content of PVC create a non-environmental friendly image of the material.
In general all the above films suffer from difficult unwinding due to stickiness of both
sides of the film. This effect is annoying to the everyday users of the films e.g.
housewives. This deficiency is remedied by the present invention.
The present ion provides film having a ess of less than 25 microns. The
film comprises at least two layers namely a release layer and an adhesive layer and is
able to remedy the deficiencies of the films of the current state of the art. Further the
present invention relates to the use of said film as a kitchen wrap film and further to
the use of said film for wrapping food.
In the prior art literature there have been attempts to develop a cling film with release
properties.
For example, US 8,197,927 describes a film where the release layer is a blend of
polypropylene and high density polyethylene. The patent teaches that coefficient of
friction properties are improved after stretching. Nevertheless, the coefficient of
friction values are in the range of 0.49 which is quite high.
EP 2 582 519 describes also a e layer. But according to the ngs of this
application the slip and antiblock masterbatches if present must not hinder the cling
properties of the release layer to the adhesive cling layer. This means that the
coefficient of friction in practice will be still high and the film will be somewhat
difficult to .
The present invention provides a film comprising at least two layers one of which is
an adhesive layer and the other is a release layer, where the kinetic coefficient of
friction of the e layer measured according to ASTM D 1894 (film to film
measurement) is less than 0.4, preferable less than 0.3, more preferably less than 0.25
and even more preferably less than 0.2.
FILM OF THE INVENTION
The film of the present invention has a thickness of less than 25 microns, preferably
less than 20 microns, more preferably less than 18 s, even more preferably less
than 17 microns, and even more preferably less than 15 microns.
The film of the invention has ably the following ure:
RELEASE LAYER / ADHESIVE LAYER
RELEASE LAYER / TIE LAYER / ADHESIVE LAYER
RELEASE LAYER / ABUSE / TIE LAYER / ADHESIVE LAYER
RELEASE LAYER / TIE LAYER / ABUSE LAYER / TIE LAYER /
ADHESIVE LAYER
Or any other structure that comprises the above basic structures.
In a most preferable version of the film the adhesive layer is the layer used as inner
layer (=the film surface that is closest to the packed food).
Definitions:
In this application the following definitions are used:
The term “film” refers to a flat or tubular le structure of thermoplastic material.
The term “heat shrinkable” refers to a film that shrinks at least 10% in at least one of
the longitudinal and transverse directions when heated at 90°C for 4 seconds. The
shrinkability is measured in water ing to ASTM 2732. For temperatures like
100 °C or more, glycerine is used as a nce liquid.
The term “total heat shrinkability” refers to the sum of heat shrinkability at the MD
direction and heat shrinkability at the TD direction. In all cases, ASTM 2732 is used
for measurement of shrinkabilities.
The term “multilayer” refers to a film comprising 2 or more layers.
The phrase “longitudinal ion” or “machine direction” herein abbreviated “MD”
refers to a direction along the length of the film.
The phrase “outer layer” refers to the film layer which comes in immediate contact
with the outside environment (atmosphere). The outer layer in the present invention is
a ”release layer”, i.e. a low- or hesive antistick layer.
The phrase “inner layer” refers to the film layer that comes in direct contact with the
product packed.
As used herein, the term “homopolymer” refers to a polymer resulting from
polymerization of a single monomer.
As used herein, the term “copolymer” refers to a polymer resulting from
polymerization of at least two different polymers.
As used herein, the term “polymer” includes both above types.
As used herein, the term “polyolefin” refers to any polymerized olefin, which can be
linear, ed, cyclic, tic, substituted or unsubstituted. More specifically,
ed in the term polyolefin are homopolymers of olefin, copolymers of olefin,
copolymers of an olefin and a non olefinic comonomer (such as ester) etc.
Specific examples include polyethylene lymer, polypropylene homopolymer,
polybutene homopolymer, ethylene alpha olefin copolymer, propylene alpha olefin
copolymer, butene alpha olefin copolymer, ionomer, ethylene ester copolymer etc.
As used herein the term thylene” identifies polymers consisting essentially of
the ne repeating unit. The ones that have a density more than 0.940 are called
high density polyethylene (HDPE), the ones that are have less than 0.940 are low
density polyethylene (LDPE).
As used herein the phrase “ethylene alpha olefin copolymer” refers to polymers like
linear low density polyethylene (LLDPE), medium y polyethylene (MDPE),
very low density polyethylene (VLDPE), ultra-low density polyethylene (ULDPE),
metallocene catalysed polymers and polyethylene plastomers and elastomers.
As used herein the term eneous ethylene alpha olefin copolymers” refer to
ethylene alpha olefin copolymers having a molecular weight distribution less than 2.7
as measured by GPC. l examples of these rs are AFFINITY® from
DOW or Exact® from Exxon.
As used herein the phrase “styrene polymers” refers to styrene homopolymers such as
polystyrene and to styrene copolymers such as e-butadiene copolymers, styrenebutadiene-styrene
copolymers, styrene-isoprene-styrene copolymers, styreneethylene-butadiene-styrene
copolymers, ethylene-styrene copolymers and the like.
As used herein the phrase ”ethylene methacrylate copolymers” refers to copolymers
of ethylene and methacrylate monomer. The monomer content is less than 40% per
As used herein the phrase “ethylene vinyl acetate copolymer” or EVA refers to
copolymers of ethylene and vinyl acetate.
As used herein the phrase “ethylene ester mer” es any polymer made
from ethylene and ester monomers. It is obvious that this term includes EVAs, EMAs
and other polymers.
As used herein the term “oxygen barrier r” refers to polymers which have the
property to limit the passage of oxygen through a film or a layer comprising the
polymer. Common als are EVOH, PVDC or polyamide.
As used herein, the term EVOH refers to saponified products of ethylene vinyl ester
copolymers. The ethylene content is typically in the range of 25 to 50% per mol. All
the later references to EVOH ethylene content will be in % per mol.
As used herein the term PVDC refers to a vinylidene chloride mer wherein a
major amount of the copolymer ses vinylidene chloride and a minor amount of
the copolymer comprises one or more monomers such as vinyl chloride and/or alkyl
acrylates and methacrylates.
As used herein the term “polyamide” refers to lymers and copolymers.
Polyamide 6, polyamide 66, polyamide 12, polyamide 6/66, polyamide 6/12,
polyamide elastomers, MXD polyamides and other copolymers are specifically useful
for the invention.
As used herein the term “polyester” refers to polymers comprising terephthalate units.
Examples of polyesters are PET (polyethylene thalate), PBT (polybutylene
terephthalate), polyester elastomer (block copolymer comprising ester or ether units),
PTT and other similar polymers.
As used herein, the term “ionomer” comprises the copolymers of ethylene and
methacrylic or acrylic acid being metal neutralized. An e of such material is
Surlyn ® from Dupont.
As used herein, the term “polypropylene” refers to polymers incorporating propylene
structural units. Examples of these, are homo polypropylenes, random copolymers of
propylene and ethylene, block copolymers of propylene and ethylene, copolymers or
blends of propylene and rubber (such as blends of polypropylene and ethylene
propylene rubber), propylene ethylene alpha olefin terpolymers and others.
These polymers may be isotactic, syndiotactic or atactic. Isotactic configuration is
preferred.
As used herein the term “self adhesive material” refers to materials that when
produced into film form can be bonded to themselves by re only without the
need to be . The bonding level which separates self adhesive from non self
adhesive materials is 5 g/15 mm when the bonding has been done on a 100 x 1500
mm film piece with a pressure of 3 bar at a temperature of 23 °C and 50% ve
humidity and with a contact time of 5 seconds. Values of more than 5 g/15 mm
according to this test show that the material is self ve whereas values of lower
than 5 g/15 mm show the film being non self adhesive.
As used herein the term “substantially non resilient material” refers to materials or
material compounds sing at least 40% per weight inorganics like calcium
ate, titanium e, wollastonite, mica, glass fibers, dolomite and the like.
The rest percentage per weight can be polyethylene, polypropylene, styrene polymer
or other thermoplastic material.
As used herein the term “tackifier” refers to low molecular weight materials used to
increase the stickiness of the surface of an adhesive. Typical examples are rosins and
their derivatives, terpenes and modified terpenes, enated hydrocarbon resins,
C5 aliptatic resins, C9 aromatic resins, C5/C9 , terpene/phenol resins and the
like.
All measurement methods mentioned herein are y available for the skilled
person. For example, they can be obtained from the American National Standards
Institute at: www.webstore.ansi.org
All percentages are based on weight per weight ratio, except when otherwise stated.
The grs/square meter is same as g/m2. Both are expressing the weight to surface ratio.
Detailed description of layers:
Inner layer (adhesive)
The inner layer comprises an adhesive material.
In a further preferred embodiment, the weight of the inner layer is less than 6 g/m2,
more ably less than 5 g/m2.
In a preferred version, the ve material comprises ethylene vinyl acetate
copolymer where the vinyl acetate weight ratio is at least 20%, more preferably at
least 25%, even more preferably at least 25%, even more preferably at least 40%.
In another preferred version the adhesive material is a propylene ethylene copolymer
where the ethylene content is at least 10% per weight.
In another preferred version the adhesive material comprises an ethylene alpha olefin
copolymer with density less than 0.9 g/cm3, even more preferably less than 0.880
g/m 3. Preferred alpha olefins are butene, hexene or octene.
In another red version, the adhesive material comprises a maleic anhydrite
grafted polyolefin. Examples are maleic anhydrite grafted ethylene vinyl acetate
copolymer of linear low y polyethylene.
In r preferred version, the adhesive al comprises styrene copolymers with
styrene content less than 50% per weight. Typical examples are styrene butadiene
styrene copolymers, e ne styrene copolymers, styrene ethylene butadiene
copolymers and the like.
In another red version, the adhesive material comprises ethylene methyl acrylate
copolymer with a methyl acrylate content of at least 20%.
In another red version, the adhesive material comprises ethylene butyl acrylate
material with a butyl acrylate content of at least 15%.
In another preferred version, the adhesive material comprises poly-isobutylene
polymer (PIB) or polybutene copolymer.
The inner layer may comprise also non self adhesive materials such as polyolefins
(preferably polyethylene lymers or copolymers) but not to the extent that the
adhesive ties are compromised.
In r version, the inner layer may comprise tackifiers such as hydrocarbon
, terpene resins, rosins and the like. Typical examples are Escorez® materials
from Exxon.
In a further preferred version the inner layer may comprise materials such as
“substantially non resilient materials” (SNR). See the above definition of this term.
In a preferred version of the invention, the adhesive material in the inner layer is an
extrudable al, meaning that it is melt processed by extrusion process.
Outer layer (release layer)
As defined above, the phrase “outer layer” refers to the film layer that comes in direct
t with the environment.
red materials for the outer layer include efins, such as low density
polyethylene, high density polyethylene, ethylene ester copolymer, ethylene alpha
olefin copolymer and polypropylene. Ionomers and styrene copolymers are also
possible. Ethylene alpha olefin copolymer is particularly preferred.
According to a further embodiment, the present invention is of the same configuration
where outer layer comprises a “substantially non resilient material” (SNR).
In a preferred version of the invention, the SNR material is at least 10 percent,
preferably at least 20, preferably at least 30 percent per weight of the outer layer.
In a red version the outer layer comprises at least one release agent that is a
polymer or chemical substance that allows the surface tension of the outer side to
decrease. The reason for this is to allow the easy unwinding of the reel when the inner
and the outer side come in contact one to the other. Preferred release agents are
organic lubricants (such as erucamide or oleamide) and silicone or siloxane based
lubricants.
In a preferred version the release layer comprises at least 200 ppm of an amide based
lubricant. Typical amide based lubricants are erucamide, oleamide, stearamide, oleyl
palmitamide, behenamide and the like. In a more preferred version, the e layer
comprises at least 500 ppm of an amide based lubricant as of above.
In a further preferred version, the film comprises a PDMS based lubricant in a
tage from 0.1 to 10%, preferably.
Tie layers
In the tie layers typical adhesive resins like maleic anhydride modified efins
may be used. l examples are BYNEL® from Dupont and OREVAC® from
Arkema.
In another preferred version the tie layers comprise low density polyethylene, linear
low density polyethylene, ethylene ester copolymers such as EVA, EMA or EBA and
other polyolefin homopolymers, mers and terpolymers.
In another red version of the invention, polyamide could be used as tie layer.
In that case a tie layer is needed n polyamide and polyolefins.
Abuse layers
In the abuse layers the use of polyolefin homopolymers and/or copolymers is
preferred. Polyamide, polystyrene and polyester is also possible.
The preferred production method for the film is the hot blown film method, which is
well known in the art. Other methods like extrusion through flat cast die are also
possible.
Additives well known in the art may be used in one or more layers of the present
invention. Slip additives, antiblock additives, g, polymer processing aids may be
used if pertinent.
In order to increase the mechanical ties the film may be crosslinked with one of
the following s: E-beam radiation, gamma radiation, moisture crosslinking
using silane grafting compounds, peroxide crosslinking.
The film may be in tubular form or sealed at the edges or single sheet configuration.
Centerfold configuration is also possible.
EXAMPLES
EXAMPLE 1
A 5 layer film is ed in a commercial hot blown film line with the following
recipe:
Outer layer 75% EAO1+ 15% SNR1+ 10% slip antiblock masterbatch
Tie layer EAO1
Abuse layer EAO1
Tie layer EAO1
Inner layer Ethylene vinyl acetate copolymer comprising 80% vinyl acetate per
weight (= a blend of EVA with 90% vinyl acetate + 10% low density
polyethylene)
See table 1
The thickness (in microns) of the structure is 5/1.5/1.5/1.5/3 starting from the inner
and going to the outer layer.
TABLE 1
Type Description Density
g/cm3
EAO1 Ethylene octene copolymer (LLDPE) 0.92
SNR1 Calcium ate compound 1.6
The slip ock masterbatch comprises 5% of erucamide, 10% silica and the
balance LDPE.
EXAMPLE 2
A 5 layer film is produced in a commercial hot blown film line with the following
recipe:
Outer layer 75% EAO1+ 15% SNR1+ 8% slip antiblock masterbatch + 2% PDMS
masterbatch
Tie layer EAO1
Abuse layer EAO1
Tie layer EAO1
Inner layer A blend of 90% ethylene vinyl acetate copolymer comprising 80%
vinyl acetate per weight + 10% m carbonate polyethylene
compound
The thickness of the structure (in microns) is 4/1.5/1.3/1.5/3
TESTING THE MATERIAL AS KITCHEN WRAP
The films coefficient of on was measured as per ASTM D 1894 using a
-ALBERT ® coefficient of friction tester in film to film measurement.
Therefore, according to the teachings of the ASTM D1894 the cof of the outer
(release side) was tested in a film to film measurement.
Therefore, for film 1 outer release side a coefficient of friction of 0.19 was measured
and for film 2 a value of 0.24 was measured.
The values represent the kinetic coefficient of on. Static coefficient of friction
was slightly higher (as ed to the person skilled in the art) in the range of 0.25-
0.35.
For the commercial PVC film a coefficient of friction of 0.9 was measured.
The side was sticky therefore the measurement was difficult to do.
Then all three films were evaluated as per “easy to unfold” e. Films 1 and 2
were much easier to unfold and unwind versus the commercial PVC film. Therefore
the practical applicability of the invention is justified.
Claims (8)
1. A film with thickness of less than 25 microns comprising a release layer and an inner adhesive layer, 5 wherein the release layer of the film comprises from 0.1 to 10% by weight PDMS, wherein the adhesive layer comprises ethylene vinyl acetate copolymer, and wherein the kinetic coefficient of friction of the release layer e of the film ed according to ASTM D 1894 (film to film measurement) is less 10 than 0.4.
2. The film of claim 1, wherein the release layer comprises at least 200 ppm of an amide lubricant. 15
3. The film of one of the preceding claims, wherein the film thickness is less than 20 microns.
4. The film of one of the preceding claims, wherein the film thickness is less than 17 microns.
5. The film of one of the preceding claims, wherein the release layer comprises polyolefin homopolymer or copolymer.
6. The film of one of the preceding claims, n between the adhesive and 25 release layer there is at least one tie layer.
7. Use of the film according claims 1 to 6, as a kitchen wrap film.
8. Use of the film ing claims 1 to 6, for wrapping food.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17197778 | 2017-10-23 | ||
EP17197778.8 | 2017-10-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ747556A NZ747556A (en) | 2022-03-25 |
NZ747556B2 true NZ747556B2 (en) | 2022-06-28 |
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