WO2021167739A1 - Film étirable manuel en dérouleur à haute ténacité pour une stabilité de palette améliorée - Google Patents

Film étirable manuel en dérouleur à haute ténacité pour une stabilité de palette améliorée Download PDF

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Publication number
WO2021167739A1
WO2021167739A1 PCT/US2021/014372 US2021014372W WO2021167739A1 WO 2021167739 A1 WO2021167739 A1 WO 2021167739A1 US 2021014372 W US2021014372 W US 2021014372W WO 2021167739 A1 WO2021167739 A1 WO 2021167739A1
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Prior art keywords
layer
polyethylene
polymer
multilayer film
density
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PCT/US2021/014372
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English (en)
Inventor
Bart Lauwers
Dirk VAN DER SANDEN
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Exxonmobil Chemical Patents Inc.
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Priority to EP21705775.1A priority Critical patent/EP4106994A1/fr
Publication of WO2021167739A1 publication Critical patent/WO2021167739A1/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
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • 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
    • 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
    • B65D65/02—Wrappers or flexible covers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92114—Dimensions
    • B29C2948/92152—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92609—Dimensions
    • B29C2948/92647—Thickness
    • 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
    • B32B2250/03—3 layers
    • 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
    • B32B2250/04—4 layers
    • 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
    • B32B2250/05—5 or more layers
    • 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
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • 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
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582—Tearability
    • B32B2307/5825—Tear resistant
    • 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
    • B32B2307/72—Density
    • 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for

Definitions

  • the present disclosure provides for multilayer films.
  • the first layer may include a polyethylene having a density of from about 0.91 g/cm 3 to about 0.92 g/cm 3 .
  • the second layer, disposed on the first layer may include a blend of a second polymer including a copolymer of ethylene and hexene having a density of from about 0.92 g/cm 3 to about 0.93 g/cm 3 and a melt index of from about 0.3 g/lOmin to about 1 g/lOmin and a third polymer including a copolymer of ethylene and hexene having a density of from about 0.91 g/cm 3 to about 0.92 g/cm 3 and a melt index of from about 2 g/lOmin to about 4 g/lOmin.
  • the third layer, disposed on the second layer may include a fourth polymer including polyethylene having a density of about 0.91 g/cm 3 to about 0.92 g/cm 3 .
  • the multilayer films of the present disclosure may include additional layers, such as a fourth layer disposed between the first layer and the second layer, the fourth layer including a fourth polymer including a copolymer of ethylene and hexene having a density of from about 0.91 g/cm 3 to about 0.92 g/cm 3 .
  • polyolefins include homopolyethylene, homopolypropylene, propylene copolymerized with ethylene and/or butene, ethylene copolymerized with one or more of propylene, butene or hexene, and optional dienes.
  • “Elastomer” or “elastomer composition” refers to a polymer or composition of polymers (such as blends of polymers) consistent with the ASTM D1566 definition. Elastomer includes mixed blends of polymers such as melt mixing and/or reactor blends of polymers. [0026]
  • the terms “first” layer, “second” layer, “third” layer, “fourth” layer, and “fifth” layer are merely identifiers used for convenience, and shall not be construed as limitation on individual layers, their relative positions, or the multi-layer structure, unless otherwise specified.
  • Suitable commercial polymers for an HDPE may include those sold by ExxonMobil Chemical Company in Houston Tex., including HDPE HD and HDPE HTA and those sold under the trade names PAXONTM (ExxonMobil Chemical Company, Houston, Texas, USA); CONTINUUMTM, DOWTM, DOWLEXTM, and UNIVALTM (The Dow Chemical Company, Midland, Michigan, USA).
  • Commercial HDPE is available with a density range such as 0.94 g/cm 3 to 0.963 g/cm 3 and melt index (MH . ib) range such as 0.06 g/10 min. to 33 g/10 min.
  • Other HDPE polymers include:
  • the polyethylene is an ethylene copolymer, either random or block, of ethylene and one or more comonomers selected from C3 to C20 linear, branched or cyclic monomers, often C4 to C12 a-olefins.
  • Diolefin monomers may include any suitable hydrocarbon structure, e.g. a C4 to C30, having at least two unsaturated bonds, where at least two of the unsaturated bonds are readily incorporated into a polymer by either a stereospecific or a non- stereospecific catalyst(s).
  • the diolefin monomers may be selected from alpha, omega-diene monomers (e.g., di- vinyl monomers).
  • the diolefin monomers may be linear di- vinyl monomers, containing from 4 to 30 carbon atoms.
  • T c a crystallization temperature of about 15 °C to about 130 °C, about 20 °C to about 120 °C, about 25 °C to about 110 °C, or about 60 °C to about 125 °C, as determined based on ASTM D3418-03;
  • Rg stands for Radius of Gyration and is measured using a Waters 150 gel permeation chromatograph equipped with a Multi- Angle Laser Light Scattering (“MALLS”) detector, a viscosity detector and a differential refractive index detector.
  • MALLS Multi- Angle Laser Light Scattering
  • Ranges expressly disclosed include, but are not limited to, ranges formed by combinations of the above- enumerated values, e.g., about 70% to about 98%, about 80 to about 95%, about 85 to about 90% etc.
  • a EHl-type polyethylene may have a density about 0.918 g/cm 3 or greater, about 0.920 g/cm 3 or greater, about 0.922 g/cm 3 or greater, about 0.927 g/cm 3 or greater, about 0.930 g/cm 3 or greater, about 0.932 g/cm 3 or greater.
  • ExceedTM XP 8318 metallocene polyethylene (mPE) resin has an MI of 1.0 g/10 min and a density of 0.918 g/cm 3 , and is commercially available from ExxonMobil Chemical Company, Houston, Texas.
  • ExceedTM 2718HA metallocene polyethylene (mPE) resin has an MI of 2.7 g/10 min and a density of 0.918 g/cm 3 , and is commercially available from ExxonMobil Chemical Company, Houston, Texas.
  • the polyethylene may contain less than 5 ppm hafnium, less than 2 ppm hafnium, less than 1.5 ppm hafnium, or less than 1 ppm hafnium. In other embodiments, the polyethylene polymers may contain from about 0.01 ppm to about 2 ppm hafnium, from about 0.01 ppm to about 1.5 ppm hafnium, or from about 0.01 ppm to about 1 ppm hafnium.
  • the propylene-based elastomer can contain about 50 wt% or greater, about 60 wt% or greater, about 65 wt% or greater, about 75 wt% or greater, or about 99 wt% or less propylene- derived units, based on the total weight of the propylene-based elastomer.
  • the propylene -based elastomer can include ethylene- derived units.
  • the propylene-based elastomer may include of about 5 wt%, about 10 wt%, or about 14 wt% to about 22 wt%, or about 25 wt% of ethylene-derived units by weight of the propylene -based elastomer.
  • the H f value may be from about 1 J/g, about 1.5 J/g, about 3 J/g, about 4 J/g, about 6 J/g, or about 7 J/g, to about 30 J/g, about 35 J/g, about 40 J/g, about 50 J/g, about 60 J/g, about 70 J/g, or about 75 J/g.
  • the propylene-based elastomer may have a Mooney viscosity [ML (1+4) @ 125 °C], as determined according to ASTM D-1646, of about 100 or less, about 75 or less, about 60 or less, or about 30 or less.
  • the propylene-based elastomer may have an Elongation at Break of about 2000% or less, about 1000% or less, or about 800% or less, as measured per ASTM D412.
  • Commercial examples of such propylene-based elastomers includes VistamaxxTM propylene- based elastomers from ExxonMobil Chemical Company, TafmerTM elastomers from Mitsui Chemicals, and VersifyTM elastomers from Dow Chemical Company.
  • VistamaxxTM propylene- based elastomers from ExxonMobil Chemical Company
  • TafmerTM elastomers from Mitsui Chemicals
  • VersifyTM elastomers from Dow Chemical Company.
  • the multilayer film includes a first layer, a second layer disposed on the first layer, and a third layer disposed on the second layer.
  • Each of the first layer, the second layer, and the third layer includes a polyethylene polymer, optionally mixed with a second or third polyethylene polymer or other polymers or additives.
  • the multilayer film may have a 1/2/3 structure where 1 and 3 are outer layers and 2 is a central layer disposed between the outer layers.
  • one or both of the first layer and the third layer can be an outermost layer forming one or both film surfaces.
  • the composition of the polyethylene of the first layer and the polyethylene of the third layer may be the same or different.
  • a multilayer film includes in at least one layer at least one of LLDPE, LDPE and HDPE.
  • the polyethylene homopolymer may be present in an amount of about 30 wt% or greater, for example, from about 30 wt%, about 35 wt%, about 40 wt%, about 45 wt%, about 50 wt%, about 55 wt%, about or 60 wt%, to about 70 wt%, about 75 wt%, about 80 wt%, about 85 wt%, about 90 wt%, about 95 wt%, or about 100 wt%, based on the total weight of polymer in the layer.
  • the first layer include a polyethylene composition including LLDPE and a propylene -based elastomer, such as about 75 wt% or greater, about 80 wt% or greater, about 85 wt% or greater, about 90 wt% or greater, about 95 wt% or greater LLDPE, with the remaining wt% including the propylene-based elastomer, based on the total weight of polymer in the first layer.
  • a multilayer film includes in each of the first layer or the third layer 100 wt% of an HDPE, based on total weight of polymer in the first layer or the third layer.
  • the multilayer film has a five layer 1/4/2/5/3 structure, including: (a) the first layer and the third layer, each including about 95 wt% or greater of an LLDPE, where the LLDPE has a density of about 0.91 g/cm 3 to about 0.925 g/cm 3 ; (b) the fourth and the fifth layer, each including about 100 wt% of a first EAO copolymer based on total weight of polymer in each of the fourth layer and the fifth layer, where the first EAO copolymer has a density of about 0.91 g/cm 3 to about 0.92 g/cm 3 , and an MI2.16 of about 0.1 g/10 min to about 15 g/10 min; and (b) a second layer disposed between the fourth layer and the fifth layer including 100 wt% of a second EAO copolymer, based on the total weight of polymer in the second layer, where the second EAO copolymer has a density of about 0.92
  • the properties and descriptions below are intended to encompass measurements in both the machine direction (MD) and the transverse direction (TD). Such measurements are reported separately, with the designation “MD” indicating a measurement in the machine direction, and “TD” indicating a measurement in the transverse direction.
  • MD machine direction
  • TD transverse direction
  • Tensile properties of the films can be measured as specified by ASTM D882 with static weighing and a constant rate of grip separation. Since rectangular shaped test samples can be used, no additional extensometer is used to measure extension. The nominal width of the tested film sample is 15 mm and the initial distance between the grips is 50 mm. A pre-load of 0.1N is used to compensate for the so called TOE region at the origin of the stress-strain curve.
  • the Elmendorf Tear strength in the MD can be from about 0.5 g/pm to about 20 g/pm, from about 0.5 g/pm to about 15 g/pm, from about 1 g/pm to about 12 g/pm, from about 2 g/pm to about 11 g/pm, or from about 4 g/pm to about 10 g/pm, as determined by ASTM D1922-06a, which measures the energy used to continue a pre-cut tear in the test sample, expressed in (g/pm). Samples were cut across the web using the constant radius tear die and were free of visible defects (e.g., die lines, gels, etc.);
  • a method for making an multilayer film may include: extruding a first layer, a second layer disposed on the first layer, and a third layer disposed on the second layer, where the first layer and the third layer include an EAO copolymer or a polyethylene composition including an EAO copolymer independently selected from (i) a polyethylene having a density of about 0.94 g/cc or greater; (ii) a polyethylene copolymer including ethylene and a C4-C12 alpha-olefin having a density from about 0.927 g/cc to about 0.95 g/cc; or (iii) a mixture thereof, where at least one of the first layer or the third layer includes the polyethylene copolymer, where the second layer includes a polyethylene composition having a density of about 0.91 g/cc or greater.
  • a method of making a multilayer film further includes: extruding a fifth layer disposed between the second layer and the third layer, where the fifth layer includes a polyethylene.
  • Multilayer films may be used to wrap goods on a pallet.
  • the films described provide ability to both bundle the goods (holding force) and keep them in place during transit (lock-in force).
  • the holding force may be characterized as a force provided per gram of the multilayer film per cubic meter of the pallet.
  • Multilayer films described provide a holding force with fewer grams of film than previously described films and, therefore, a pallet wrapped in a multilayer film would use less total polymer to provide sufficient holding to bundle the goods.
  • the density was measured according to ISO 1183 using ISO 1872-2 for sample preparation.
  • FIG. IB is the same graph of tensile strength in the machine direction focused on a narrower % elongation of polyolefin films both according to an embodiment and comparative examples.
  • the MD tensile strength shows the double yield point of the film according to example 1 (line 103).
  • the force used to stretch the film increases until a certain elongation (as shown for line 103 about 5-6%) and then the force needed to continue elongation changes very minimally, the film yields to the stretching. After about 25-35% elongation the force to continue stretching the film increases more dramatically and at about 50% elongation the force used to continue stretching the film does not change, showing the second yield point, therefore, line 103 has a double-yield point.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente divulgation se rapporte à des films multicouches. La première couche peut comprendre un premier polymère comprenant du polyéthylène. La deuxième couche, disposée sur la première couche, peut comprendre un mélange d'un deuxième polymère comprenant un copolymère d'éthylène et d'hexène et un troisième polymère comprenant un copolymère d'éthylène et d'hexène. La troisième couche, disposée sur la deuxième couche, peut comprendre un quatrième polymère comprenant du polyéthylène. La présente divulgation se rapporte également à des procédés permettant de préparer des films multicouches. Les procédés peuvent consister à extruder une première couche, une deuxième couche disposée sur la première couche, et une troisième couche disposée sur la deuxième couche afin de former un film multicouche. De plus, la présente divulgation se rapporte à des palettes enveloppées dans un film multicouche, le film multicouche étant conçu pour fournir une force de maintien d'environ 1,15 N par gramme du film multicouche par mètre cube de la palette et des marchandises.
PCT/US2021/014372 2020-02-18 2021-01-21 Film étirable manuel en dérouleur à haute ténacité pour une stabilité de palette améliorée WO2021167739A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21705775.1A EP4106994A1 (fr) 2020-02-18 2021-01-21 Film étirable manuel en dérouleur à haute ténacité pour une stabilité de palette améliorée

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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US62/977,795 2020-02-18

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