WO2014185463A1 - Film multicouche facilement libérable et emballage formé de celui-ci - Google Patents

Film multicouche facilement libérable et emballage formé de celui-ci Download PDF

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Publication number
WO2014185463A1
WO2014185463A1 PCT/JP2014/062871 JP2014062871W WO2014185463A1 WO 2014185463 A1 WO2014185463 A1 WO 2014185463A1 JP 2014062871 W JP2014062871 W JP 2014062871W WO 2014185463 A1 WO2014185463 A1 WO 2014185463A1
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Prior art keywords
layer
heat
weight
density polyethylene
laminated film
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PCT/JP2014/062871
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English (en)
Japanese (ja)
Inventor
田口　栄一
和臣 石井
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三井化学東セロ株式会社
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Application filed by 三井化学東セロ株式会社 filed Critical 三井化学東セロ株式会社
Priority to KR1020157030242A priority Critical patent/KR101749853B1/ko
Priority to JP2015517116A priority patent/JP5959737B2/ja
Publication of WO2014185463A1 publication Critical patent/WO2014185463A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/748—Releasability

Definitions

  • the present invention relates to an easily peelable laminated film excellent in easy peelability and sealing property, and a package using such an easily peelable laminated film.
  • Packaging for snacks such as rice crackers, potato chips, or any other jelly such as fruit jelly
  • assorted rice such as milk, yogurt, pudding, tofu, and white rice
  • retort rice such as red rice and gomoku rice
  • all food packaging such as lactic acid beverages
  • Sealing plastic containers such as plastic laminate film or aluminum foil laminate film for bottles, cups or tray-like polypropylene or polystyrene as blister packaging
  • pharmaceuticals, medical equipment packaging, and other daily necessities and miscellaneous goods packaging Wrapped packaging is widely adopted. What is required for such packaging is mechanical strength that can withstand distribution channels, sealing strength that can maintain hygiene, and good openability during use.
  • an easy-opening package comprising a mixture layer of a polypropylene resin and a polyethylene resin and a high-density polyethylene resin layer
  • Patent Document 1 Special
  • Patent Document 2 JP-B-5 No. 6513
  • a film in which a mixture layer of a polypropylene resin and a polyethylene resin is merely a heat-sealing layer is not always satisfactory in terms of the balance between sealing performance and easy opening performance.
  • an easily openable sealing material comprising an olefin polymer composition in which an ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer is added to a propylene polymer and an ethylene polymer has been proposed.
  • an easily openable sealing material comprising an olefin polymer composition in which an ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer is added to a propylene polymer and an ethylene polymer.
  • a heat fusion layer comprising a polyolefin composition in which an ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer is added to a propylene polymer and an ethylene polymer.
  • a laminate layer made of an ethylene polymer Patent Document 4: Japanese Patent Application Laid-Open No. 2004-42450
  • obtaining an easily peelable laminated film excellent in easy peelability even when the heat fusion temperature becomes high is obtained.
  • the problem of the present invention is that it can be easily peeled even when the heat-sealing temperature is increased, and can withstand external pressure (external pressure) and internal pressure (internal pressure) even at a temperature higher than room temperature.
  • the object is to develop an easily peelable laminated film having sealing strength and a packaging body using the easily peelable laminated film.
  • the easily peelable laminated film characterized by comprising the heat-fusible layer which consists of an olefin polymer composition (C) containing], and the package body using the said easily peelable laminated film.
  • the easily peelable laminated film of the present invention is itself excellent in blocking resistance, hygiene, film forming workability, and laminate workability, and the easily peelable laminated film is replaced with other members or easily peelable laminated films.
  • heat-sealing with a propylene polymer layer which is a heat-sealing layer, has stable heat-sealing strength (peeling strength) in a wide temperature range, and easy when peeling (opening) Moreover, it has a strong sealing strength (internal pressure strength) even at a temperature higher than room temperature.
  • the linear low density polyethylene (A) which is a component constituting the laminate layer of the easily peelable laminated film of the present invention, is usually manufactured and sold under the names of linear low density polyethylene, L-LDPE, and the like.
  • An ⁇ -olefin random copolymer usually having a density in the range of 0.905 to less than 0.930 g / cm 3 , preferably 0.910 to 0.928 g / cm 3 .
  • the ⁇ -olefin copolymerized with ethylene is usually an ⁇ -olefin having 4 or more carbon atoms, preferably 1-butene, 1-heptene, 1-octene, 4-methyl-1-pentene.
  • the MFR (ASTM D1238 load 2160 g, temperature 190 ° C.) is usually 1 to 30 g / 10 min, as long as the linear low density polyethylene (A) according to the present invention has film-forming ability, but the MFR is not particularly limited. Preferably, it is in the range of 1 to 10 g / 10 minutes.
  • the linear low density polyethylene (A) according to the present invention has a molecular weight distribution (weight average molecular weight: Mw, number average molecular weight: Mn, ratio: expressed as Mw / Mn) of 1.5 to 4.0. More preferably, it is in the range of 1.8 to 3.5. This Mw / Mn can be measured by gel permeation chromatography (GPC).
  • the linear low density polyethylene (A) according to the present invention has one or more sharp peaks determined from an endothermic curve measured at a temperature rising rate of 10 ° C./min of a differential scanning calorimeter (DSC),
  • the peak maximum temperature, that is, the melting point is preferably 70 to 130 ° C., more preferably in the range of 80 to 120 ° C.
  • the linear low density polyethylene (A) according to the present invention can be prepared by a conventionally known production method using a single site catalyst.
  • linear low density polyethylene (L-LDPE) can be prepared using a catalyst containing a metallocene compound of a transition metal.
  • the catalyst containing the metallocene compound is preferably formed from (a) a transition metal metallocene compound, (b) an organoaluminum oxy compound, and (c) a carrier, and if necessary, these components and (D) It may be formed from an organoaluminum compound and / or an organoboron compound.
  • a catalyst for olefin polymerization containing such a metallocene compound and a method for preparing linear low density polyethylene (L-LDPE) using the catalyst are described in, for example, JP-A-8-269270.
  • the linear low density polyethylene (A) according to the present invention may be used together with other polymers including other ethylene polymers.
  • the other polymers generally constitute a laminate layer.
  • the amount of the polymer component is less than 50%, more preferably 30% by weight or less, and still more preferably 20% by weight or less.
  • linear low density polyethylene (A) In the linear low density polyethylene (A) according to the present invention, various known additives that are usually added to an olefin polymer, for example, an antioxidant, a weathering stabilizer, a charge, are included within the range not impairing the object of the present invention.
  • Anti-fogging agents, anti-fogging agents, anti-blocking agents, slip agents (lubricants) and the like can be blended as necessary.
  • the ethylene polymer (B) constituting the intermediate layer (layer between the laminate layer and the heat-sealing layer) of the easily peelable laminated film of the present invention has a density of 0.905 to 0.970 g / cm 3 .
  • MFR ASTM D1238 load 2160 g, temperature 190 ° C.
  • MFR is preferably 1 to 30 g / 10 min, more preferably 1 to 10 g / 10 min ethylene homopolymer or ethylene and a small amount of an ⁇ -olefin having 3 to 10 carbon atoms, such as propylene, butene-1, heptene-1, hexene-1, octene-1, 4-methyl
  • a random copolymer with pentene-1 which is a so-called polymer mainly composed of ethylene, which is called as exemplified below.
  • High-pressure low-density polyethylene [normally range density less than 0.905 g / cm 3 or more ⁇ 0.930 g / cm 3]
  • Linear low-density polyethylene also referred to as linear low-density polyethylene (L-LDPE) [usually in a density range of 0.905 g / cm 3 or more to less than 0.930 g / cm 3 ]
  • Medium density polyethylene MDPE
  • MDPE Medium density polyethylene
  • High density polyethylene (HDPE) [usually in the range of density exceeding 0.945 g / cm 3 to 0.970 g / cm 3 or less]
  • These ethylene polymers (B) may be a single polymer or a composition (mixture) of two or more ethylene polymers. These can be used as an ethylene polymer composition.
  • the polymer constituting the intermediate layer is medium density polyethylene or high density polyethylene.
  • the ethylene polymer (B) may be used together with other polymers in addition to medium density polyethylene and high density polyethylene, and other ethylene polymers such as the above-mentioned linear low density polyethylene (A). May be included.
  • the other polymer is generally less than 50% by weight of the polymer constituting the intermediate layer, preferably 30% by weight or less, more preferably 20% by weight or less.
  • a composition comprising high-density polyethylene (HDPE: B1) and high-pressure method low-density polyethylene (HP-LDPE: B2) as the ethylene-based polymer (B) is excellent in film forming properties and easily peelable.
  • HDPE high-density polyethylene
  • HP-LDPE high-pressure method low-density polyethylene
  • high-density polyethylene (HDPE: B1) and high-pressure method low-density polyethylene (HP-LDPE: B2) is used as the ethylene-based polymer (B) according to the present invention
  • high-density polyethylene (B1 ) Is in the range of 95 to 70% by weight, more preferably 90 to 80% by weight
  • ⁇ It is in.
  • ethylene polymer (B) In the ethylene polymer (B) according to the present invention, various known additives that are usually added to the olefin polymer, for example, an antioxidant, a weathering stabilizer, an antistatic agent, as long as the object of the present invention is not impaired.
  • an agent, an antifogging agent, an antiblocking agent, a slipping agent (lubricant) and the like can be blended as necessary.
  • the propylene polymer (C1) which is a constituent component of the olefin polymer composition (C) constituting the heat-fusible layer of the easily peelable laminated film of the present invention, is a resin that is generally manufactured and sold under the name of polypropylene.
  • the density is 0.890 to 0.930 g / cm 3 and the MFR (ASTM D1238 load 2160 g, temperature 230 ° C.) is 0.1 to 100 g / 10 minutes, preferably 0.5 to 70 g / 10 minutes.
  • the propylene / ⁇ -olefin random copolymer usually has an ethylene or other ⁇ -olefin content of 0.5 to 20 mol%, preferably 1 to 10 mol%.
  • a propylene / ⁇ -olefin random copolymer having a melting point in the range of 100 to 155 ° C., preferably in the range of 110 to 145 ° C. is particularly easy to peel. Further, it is preferable because it has excellent sealing strength.
  • the medium density polyethylene (C2) which is a constituent of the olefin polymer composition (C) constituting the heat-sealing layer of the easily peelable laminated film of the present invention, has a density of 0.930 to 0.945 g / cm 3 ,
  • a random copolymer of ethylene and an ⁇ -olefin having 4 or more carbon atoms is preferably in the range of 0.932 to 0.940 g / cm 3 .
  • the MFR is not particularly limited, but usually MFR (ASTM D1238 load 2160 g, temperature 190 ° C. ) Is in the range of 1-30 g / 10 min, preferably 1-10 g / 10 min.
  • the medium density polyethylene (C2) according to the present invention is manufactured and sold under the name of linear low density polyethylene (L-LDPE) or medium density polyethylene (MDPE).
  • L-LDPE linear low density polyethylene
  • MDPE medium density polyethylene
  • the ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer (C3) which is a constituent of the olefin polymer composition (C) constituting the heat-sealing layer of the easily peelable laminated film of the present invention, contains ethylene and ⁇ , ⁇ -unsaturated carboxylic acid, and a part or all of the ⁇ , ⁇ -unsaturated carboxylic acid may be a metal salt.
  • ⁇ -unsaturated carboxylic acid, ⁇ , ⁇ -unsaturated carboxylic acid ester or carboxylic acid vinyl ester may be included as a cop
  • Examples of the ⁇ , ⁇ -unsaturated carboxylic acid include acrylic acid, methacrylic acid, maleic acid, and monomethyl maleate.
  • acrylic acid or methacrylic acid alkyl ester having 1 to 8 carbon atoms such as methyl, ethyl, propyl, n-butyl, isobutyl, 2-ethylhexyl ester, etc. It can be illustrated.
  • a carboxylic acid vinyl ester a vinyl acetate ester can be shown as a representative example.
  • the propylene polymer (C1) is 71 to 97% by weight, preferably 77 to 93% by weight
  • the density polyethylene (C2) is 3 to 21% by weight, preferably 3 to 20% by weight, more preferably 6.0 to 17.3% by weight
  • the ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer (D). Is 0 to 8% by weight, preferably 1 to 5.7% by weight (provided that (C1) + (C2) + (C3) 100% by weight. ].
  • the heat seal strength (peel strength) may be increased and the sealing strength may be decreased. There is.
  • the heat fusion layer is peeled off when the heat fusion layer is peeled off. Aggregation peeling occurs with little stringing of the layer.
  • the propylene polymer (C1), the medium density polyethylene (C2) and the ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer (C3), or the olefin polymer composition (C) according to the present invention include the present invention.
  • Various known additives that are usually added to the olefin polymer within a range that does not impair the purpose such as antioxidants, weathering stabilizers, antistatic agents, antifogging agents, antiblocking agents, slipping agents (lubricants), etc. Can be blended as necessary.
  • the easily peelable laminated film of the present invention is a heat comprising the laminate layer containing the linear low density polyethylene (A), the intermediate layer containing the ethylene polymer (B), and the olefin polymer composition (C). It consists of a fusion layer.
  • the laminate layer containing the linear low-density polyethylene (A) of the heat-fusible laminated film of the present invention has its surface in order to improve the adhesive strength when bonded to the base material layer (F) described later, Surface activation treatment such as corona treatment, flame treatment, plasma treatment, undercoat treatment, primer coat treatment, and flame treatment may be performed.
  • MDPE medium density polyethylene
  • HDPE high density polyethylene
  • HP-LDPE high pressure method low density polyethylene
  • L-LDPE linear low density polyethylene
  • the thickness of the laminate layer is usually 2 to 20 ⁇ m, preferably 2 to 10 ⁇ m
  • the thickness of the intermediate layer is 16 to 96 ⁇ m, preferably 16 to 56 ⁇ m
  • the thickness of the heat-sealing layer Is in the range of 2 to 20 ⁇ m, preferably 2 to 10 ⁇ m
  • the total thickness is in the range of 20 to 100 ⁇ m, preferably 20 to 60 ⁇ m.
  • the easily peelable laminated film of the present invention can be produced by various known methods. For example, in a multilayer film molding machine equipped with three or more extruders, linear low density polyethylene (A) constituting a laminate layer in two extruders, and an ethylene polymer (B) constituting an intermediate layer.
  • A linear low density polyethylene
  • B ethylene polymer
  • Each one, Propylene polymer (C1), medium density polyethylene (C2) and ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer which are components of the olefin polymer composition (C) constituting the heat fusion layer in another extruder A method in which a mixture (C3) is mixed in a predetermined amount and then directly put into a film forming machine to form a laminated film of two or more layers using a T-die, an annular die or the like, a propylene polymer (C1), Medium density polyethylene (C2) and ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer (C3) are mixed in a predetermined amount and melt-kneaded with an extruder or the like to obtain an olefin polymer composition (C). Thereafter, a method of forming a laminated film having three or more layers by using a T-die, an annular die or the like can be exemplified.
  • the base material layer (F) laminated with the laminate layer of the heat-fusible laminated film of the present invention is made of a sheet or film made of thermoplastic resin, paper, aluminum foil, or the like.
  • thermoplastic resin various known thermoplastic resins such as polyolefin (polyethylene, polypropylene, poly-4-methyl / 1-pentene, polybutene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (Nylon-6, nylon-66, polymetaxylene adipamide, etc.), polyvinyl chloride, polyimide, ethylene / vinyl acetate copolymer or saponified product thereof, polyacrylonitrile, polycarbonate, polystyrene, ionomer, or a mixture thereof Can be illustrated.
  • thermoplastic resins having good stretchability and transparency such as polypropylene, polyethylene terephthalate, and polyamide
  • the substrate made of such a thermoplastic resin film may be an unstretched film or a stretched film, and a laminate of one or more coextruded products, extruded laminate products, dry laminate products, etc. It may be the body.
  • the base material layer (F) in order to improve the adhesiveness of one side or both sides of the base material layer (F) with the laminate layer of the easily peelable laminated film, for example, corona treatment, flame treatment, plasma treatment, undercoat treatment, primer coat treatment. Alternatively, surface activation treatment such as frame treatment may be performed.
  • the thickness of the base material layer (F) is usually in the range of 5 to 1000 ⁇ m, preferably 9 to 100 ⁇ m.
  • the propylene-based polymer constituting the heat sealing layer composed of the propylene-based polymer layer provided on the other member or the easily peelable laminated film, opposite to the heat-fusible layer of the easily peelable laminated film of the present invention although the polymer is in the same category as the propylene polymer (C1), the individual physical properties may be the same or different.
  • the heat seal layer of the other member can be formed into various shapes such as a film, a sheet, a tray, a cup, and a bottle by a known method using a propylene-based polymer in accordance with the material to be packaged.
  • another member when another member is a film or a sheet
  • a tray or a cup it can be produced by once producing a sheet by the above method and then forming a container such as a tray or a cup by thermoforming such as vacuum forming or pressure forming.
  • a cup or bottle it can be molded as a container by injection molding, injection hollow molding (injection blow), hollow molding or the like.
  • a propylene-based polymer may be laminated by extrusion lamination or extrusion coating, dry lamination, or the like on the base material layer such as paper.
  • the package of the present invention is used for various packaging applications including lid materials.
  • the lid material of the present invention has the heat-sealing layer of the easily peelable laminated film as the innermost layer.
  • the various materials exemplified as the base material layer are usually laminated on the heat-sealing film.
  • the package of the present invention is a package having a heat sealing layer composed of a heat-sealing layer of the easily peelable laminated film and a propylene-based polymer layer on opposite surfaces.
  • the shape of the package of the present invention can take various shapes depending on the shape, form or application of the material to be packaged.
  • a packaging material is filled in a three-sided sealing bag composed of an easily peelable laminated film and a film having a heat sealing layer composed of a propylene-based polymer layer, and then the mouth is heat sealed.
  • the four-sided sealed package, the sheet, tray, cup, bottle, etc. with a heat-sealed layer composed of a propylene-based polymer layer, which is another member, are filled with the packaging material, and then the easily peelable laminated film Examples include a package formed by sealing the upper surface with a lid material (sealing material) having a heat-fusible layer as an innermost layer.
  • the heat-sealing layer and the polypropylene sheet of each laminated film were overlapped, and sealed at a predetermined temperature shown in Table 1 at a pressure of 0.2 MPa for 1 second using a sealer having a width of 5 mm. And then left to cool. Thereafter, the heat-sealed test specimen was treated at 115 ° C. for 30 minutes using a high-temperature and high-pressure sterilizer (retort treatment equipment), and then the specimen was cooled. A 15 mm wide test piece was cut out and the heat seal portion was peeled off at a cross bed speed of 500 mm / min, and the strength was set as the heat seal strength (N / 15 mm).
  • Evaluation of easy peelability was performed by confirming the peeled state in addition to the heat seal strength, and the case where the film was not peeled off by stringing or film-like peeling due to delamination with a tendency of cohesive peeling was marked as ⁇ .
  • Evaluation of sealing strength simply as with practical fruit jelly Using a laminated product made to evaluate easy peelability as a lid, PP-based barrier containers (PP / adhesive layer / EVOH / adhesive layer / PP) used for commercially available pulp jelly etc. are used. And evaluated.
  • the contents of commercially available pulp jelly are heated to 60 ° C., melted and transferred to a container, and the laminated product thus prepared is used as a cover material with a simple cup sealer at a temperature of 185 ° C. for 1 hour.
  • Heat-sealing was performed at a pressure of 1600 N / cup, actual pressure 0 times ⁇ 1.
  • a rubber sheet piece with an adhesive tape is attached to the top surface of the lid material in which the contents are held at about 60 ° C., and a needle is inserted from this sheet surface.
  • Sealing strength (MPa) was measured using a seal strength measuring instrument (based on JIS-Z0238).
  • C2 Medium density polyethylene (C2) Medium density polyethylene (MDPE) (manufactured by Prime Polymer Co., Ltd., trade name Neozex: NZ3510F density; 0.935 g / cm 3 , MFR; 1.6 g / 10 min).
  • C3 Ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer (C3)
  • Ethylene polymer (B) (4-1) High density polyethylene (B1) High density polyethylene (HDPE) (manufactured by Prime Polymer Co., Ltd., trade name: HYZEX: HZ3300F, density: 0.954 g / cm 3 , MFR: 1.1 g / 10 min). (4-2) High pressure low density polyethylene (B2) High pressure method low density polyethylene (HP-LDPE) (manufactured by Prime Polymer Co., Ltd., trade name: Mirason: M-11P density; 0.917 g / cm 3 , MFR; 7.2 g / 10 min).
  • B1 High density polyethylene (B1) High density polyethylene (HDPE) (manufactured by Prime Polymer Co., Ltd., trade name: HYZEX: HZ3300F, density: 0.954 g / cm 3 , MFR: 1.1 g / 10 min).
  • B2 High pressure low density polyethylene
  • HP-LDPE High pressure method low density poly
  • Linear low density polyethylene (A) Linear low-density polyethylene (L-LDPE) (manufactured by Prime Polymer Co., Ltd., trade name: Ultrazex: UZ3523L density; 0.931 g / cm 3 , MFR; 2.1 g / 10 min).
  • Example 2 An olefin polymer composition obtained by dry blending 80% by weight, MDPE; 15% by weight and EMC; 5% by weight as a heat-sealing layer, and HDPE; 85% by weight and HP as an intermediate layer.
  • -LDPE Ethylene polymer composition dry-blended with 15% by weight, using L-LDPE as a laminate layer, each supplied to separate extruders, and heat fusion layer / intermediate layer / lamine by T-die method A heat-fusible laminated film made of a three-layer coextruded film having a structure to become a layer was formed, and the laminate layer was subjected to corona treatment.
  • Example 3 An olefin polymer composition obtained by dry blending R-PP; 85% by weight, MDPE; 11.7% by weight and EMC; 3.3% by weight as a heat-fusible layer, and HDPE; 85 as an intermediate layer.
  • the ethylene polymer composition obtained by dry blending 15% by weight and HP-LDPE; 15% by weight was supplied to separate extruders using L-LDPE as the laminate layer, and heat-melted by the T-die method.
  • a heat-fusible laminated film composed of a three-layer coextruded film having a structure of an adhesion layer / intermediate layer / laminate layer was formed, and the laminate layer was subjected to corona treatment.
  • Example 4 An olefin polymer composition obtained by dry blending 90% by weight, MDPE; 8.3% by weight and EMC; 1.7% by weight as a thermal fusion layer, HDPE as an intermediate layer; 85 The ethylene polymer composition obtained by dry blending 15% by weight and HP-LDPE; 15% by weight was supplied to separate extruders using L-LDPE as the laminate layer, and heat-melted by the T-die method.
  • a heat-fusible laminated film composed of a three-layer coextruded film having a structure of an adhesive layer / intermediate layer / laminate layer was formed, and the laminate layer was subjected to corona treatment.
  • a heat-fusible laminated film composed of a three-layer coextruded film having a structure of an adhesive layer / intermediate layer / laminate layer was formed, and the laminate layer was subjected to corona treatment.
  • the heat-sealing layer composed of the olefin polymer composition is mainly composed of a heat-resistant propylene polymer, and less ethylene polymer and ethylene / ⁇ , ⁇ -unsaturated carboxylic acid copolymer.
  • the easy-openability of the easy-to-open laminate film with a sealing property composed of a laminate layer composed of a linear low density polyethylene (A), which is appropriately blended in quantity, is easier to open softly than the comparative example. Nevertheless, it is clear that the sealing strength is maintained without decreasing.
  • the easily peelable film of the present invention is suitable as a film for packaging, particularly as a cover material for polypropylene sheets, trays, cups, bottles, etc., taking advantage of the above properties, and packaging for snacks such as rice cracker potato chips, or Jelly such as pulp jelly, milk, yogurt, pudding, tofu, aseptic rice such as white rice, retort rice such as red rice and gomoku rice, all food packaging such as lactic acid beverages, packaging of pharmaceuticals, medical instruments, blister It can be suitably used as a packaging material for packaging and other packaging such as daily necessities and sundries.
  • This function can be used not only as a packaging material using a container and a lid, but also as a packaging body such as a bag such as a flat bag or a standing pouch. Further, the container and the lid can be used not only for a hard container such as jelly but also for a flexible package such as sliced ham, bacon and rice cake kamaboko for food.

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  • Wrappers (AREA)
  • Laminated Bodies (AREA)
  • Packages (AREA)

Abstract

<span lang=FR style='font-family:"Courier New";color:windowtext'>L'invention concerne la création : d'un film multicouche facilement libérable qui présente une capacité de libération facile même si la température de liaison par thermofusion est augmentée, et qui a une résistance de scellage qui est capable de supporter une pression provenant de l'extérieur (une pression externe) et une pression provenant de l'intérieur (une pression interne) même à des températures supérieures à la température ambiante ; et un emballage qui est obtenu en utilisant ce film multicouche facilement libérable. La présente invention concerne un film multicouche facilement libérable qui est caractérisé en ce qu'il est composé : d'une couche stratifiée qui contient un polyéthylène basse densité linéaire (A) ; d'une couche intermédiaire qui contient un polymère d'éthylène (B) ; et d'une couche de liaison par thermofusion qui est formée d'une composition de polymère d'oléfine (C) qui contient 71 à 97 % en poids d'un polymère de propylène (C1) ; 3 à 21 % en poids d'un polyéthylène de densité moyenne (C2) ayant une densité de 0,930 à 0,945 g/cm3</span> et 0 à 8 % en poids d'un copolymère d'éthylène acide carboxylique α, β-insaturé (C3) (à condition que (C1) + (C2) + (C3) = 100 % en poids).
PCT/JP2014/062871 2013-05-15 2014-05-14 Film multicouche facilement libérable et emballage formé de celui-ci WO2014185463A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020157030242A KR101749853B1 (ko) 2013-05-15 2014-05-14 용이 박리성 적층 필름 및 그것으로 이루어지는 포장체
JP2015517116A JP5959737B2 (ja) 2013-05-15 2014-05-14 易剥離性積層フィルム及びそれからなる包装体

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-103286 2013-05-15
JP2013103286 2013-05-15

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WO2021111815A1 (fr) * 2019-12-03 2021-06-10 デンカ株式会社 Feuille de résine multicouche et récipient de moulage

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KR102099774B1 (ko) 2019-09-25 2020-04-10 황용경 고무제품 포장용 필름의 기능성 소재 조성물 및 그 제조방법

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