Metallocene Polyethylene in Flexible Packaging

A multilayer film for packaging frozen or refrigerated foods that provides improved oxygen barrier, heat shrinkage, mechanical properties, physical property uniformity, processability, and recyclability compared to existing films. The film has a unique composition and structure. It consists of an external film, an internal adhesive film, a soft nitrided film containing ethylene vinyl acetate copolymer and low-density polyethylene, and another internal adhesive film. The soft nitrided film has a weight ratio of 1:0.25 to 1.5 of ethylene vinyl acetate copolymer and low-density polyethylene. The nitrided film also includes nylon resin. The internal adhesive films have a shrinkable adhesive resin. The external films are made of metallocene linear low-density polyethylene. The film

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A sheet, container, and package for skin pack packaging that allows skin packs to be formed using multi-layer barrier containers. The key is using a specific surface layer material that provides good adhesion to the skin pack film. The surface layer is made from a propylene-based random copolymer containing metallocene-based random polypropylene. This copolymer has specific properties like storage modulus and loss tangent that enable good adhesion to the skin pack film while maintaining heat resistance.

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Packaging laminate for products like medicines, medical devices, and hygiene products that is easy to open, tear-resistant, and has good barrier properties. The laminate has a unique structure with an outer label layer made of a polymer like PP, PET, or PEN, followed by an inner layer stack of materials like LDPE, LLDPE, HDPE, PO, and metallocene PE. This provides a strong, tear-resistant outer layer for handling and tamper evidence, with an inner layer that is easier to tear open for product access. The stacked inner layer materials also enhance barrier properties compared to a single layer.

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Packaging film material that improves the clarity of the tubes while maintaining the required stiffness and recyclability. The material is made from 5 film layers through coextmding, wherein each of 5 film layers contains 2-3 of low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), polyvinylidene chloride (PVDC), ethylene vinyl acetate (EVA) and metallocene polyethylene.

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Composite sheet for injection packaging of pesticides that has excellent barrier properties, high heat sealing strength, and pressure-bearing capacity. The composite sheet has layers arranged in sequence: printing layer, first adhesive layer, intermediate layer, second adhesive layer, and heat sealing layer. The heat sealing layer has a composite layer, core layer, and inner layer. The composite layer and core layer are made of combinations of linear low density polyethylene (LLDPE) and low density polyethylene (LDPE) for barrier properties. The core layer further contains cyclic olefin polymer for enhanced barrier. The inner layer is made of metallocene polyethylene (mPE). The heat sealing layer uses polyethylene and cyclic olefin polymers for sealing strength and moisture barrier. This composition provides the desired properties for injection packaging of pesticides.

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Polyethylene-based resin composition for packaging materials that balances moldability, bag-making processability, and film strength when inorganic compounds like calcium carbonate are added. The composition contains a specific ratio of an ethylene-α-olefin copolymer A polymerized with a metallocene-based catalyst. This copolymer, along with a resin component, provides the desired properties when the resin component makes up 25-90% of the total composition.

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Thin, monomaterial polyethylene laminated flexible packaging that has improved recyclability compared to conventional PET/PE laminates. The packaging structures have a printed film made of ethylene copolymer and a sealing film with multiple ethylene polymer layers. The sealing film thickness is 15-30 microns, much thinner than conventional sealant films. The thin sealing film is achieved by using a specific catalyst system for making the inner ethylene copolymer layer. This allows the overall laminate thickness to be reduced below conventional levels while maintaining barrier and strength properties.

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Polyethylene-based resin composition, packaging material, and manufacturing method that provide improved properties like moldability, bag-making processability, and film strength when inorganic compounds are added. The composition contains a resin component with at least 50% of an ethylene-olefin copolymer, where 10% of that copolymer is made with a metallocene catalyst. This composition allows forming films with excellent moldability and bag-making properties even when inorganic compounds are added. The packaging material is made by extruding this composition.

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Cover material for PTP (press through pack) packaging that improves push-out properties, opening recognition, and reduces unpleasant odors compared to existing materials. The cover material contains a low molecular weight polyethylene with specific molecular weight and crystallization properties. It also has controlled orientation, strength, elongation, and modulus. This optimized cover material provides better pushability, opening sound, and odor suppression for PTP packages like blister packs.

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Laminate structure for flexible packaging made from single-material polyethylene to improve recyclability. The laminate has a printed film and a sealant film. The sealant film has an inner layer with specific density and melt index. It also contains a composition of ethylene-based polymers with high molecular weight comonomer distribution and a certain melt index ratio. This composition is made using a catalyst system. The laminate's thinner construction and single-polymer materials enable easier recycling compared to conventional multi-polymer laminates.

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Multilayer film for packaging frozen or refrigerated food that provides high oxygen barrier, good heat shrinkage, and recyclability. The film consists of layers like outer films made of metallocene linear low-density polyethylene (mLLDPE), inner adhesive films containing shrinkable adhesive resin, and a central softening film made of nylon, low-density polyethylene, and ethylene vinyl acetate copolymer. The mLLDPE films improve mechanical strength, the shrinkable adhesive films enhance heat sealability, and the softening film provides low oxygen permeability. The layers can be laminated by filming and joining the resin pellets.

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Carbon-reducing heat-shrinkable packaging film made from recycled polyethylene that can be recycled and reused, reducing waste and carbon footprint compared to virgin polyethylene films. The film is manufactured using a recycled compound layer made from recycled polyethylene pellets mixed with a metallocene resin and elastomer. This allows the recycled film to retain shrinkability and avoid issues like hole formation when recycled. The film structure is formed by extruding and coextruding the recycled compound, upper, and lower layers through dies.

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Layered polyethylene film that has an outer layer for barrier coating which is made of a composition which comprises a catalytically produced polyethylene and which has a comparatively low xylene soluble (XS) content. The film includes an outer layer for barrier coating and a matrix component which is an ethylene copolymer having an MFR2 determined according to ISO 1133 of from 0.5 to 10 g/10min and a density of 920 to 935 kg/m3, wherein the outer layer composition has xylene soluble (XS) fraction determined according to ISO 16152 of 2 wt.% or less, preferably of 1.5 wt.% or less.

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Polyethylene-based resin composition, packaging material, and production method that provides good formability, processability, and strength when blended with inorganic compounds like calcium carbonate. The composition has a resin component containing 50% ethylene-α-olefin copolymer and 5-50% high-density polyethylene, with 10% of the copolymer being an ethylene-α-olefin copolymer polymerized by a metallocene-based catalyst. The composition allows reducing resin usage while maintaining properties when blended with inorganics for packaging applications.

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A packaging box design that reduces material usage and weight compared to conventional boxes for food and beverage containers. The box has open front and back walls with side walls formed by mutually coupling wing surfaces on the left and right sides. The wing surfaces themselves create the front and rear walls when connected. This eliminates the need for separate front and rear walls. The box is made from a composite film with polypropylene, metallocene polyethylene, functional additives, aluminum thin film, flame retardants, and adhesive accelerator. The composite film provides strength, flame resistance, and adhesion between the wing surfaces.

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Polyethylene-based resin composition, packaging material, and manufacturing method that balances reducing resin usage with maintaining moldability and film strength when adding inorganic fillers like calcium carbonate. The composition contains a resin component mainly made of a specific ethylene-α-olefin copolymer polymerized with a metallocene catalyst, with 10% or more of the copolymer. This allows reducing the total resin content while maintaining processability and film strength when blended with inorganic fillers.

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Polyethylene (PE) copolymers with improved film processability compared to conventional bimodal PE resins. The copolymers have a unique molecular structure with distinct lower and higher molecular weight components. The copolymers have specific properties like molecular weight distribution, viscosity, and density ranges that enable easier film extrusion and processing compared to bimodal PE resins. The copolymers are made by catalytic polymerization of ethylene using specific metallocene compounds. The resulting copolymers have better film properties like reduced break growth, improved tear strength, and reduced film rupture force compared to bimodal PE resins.

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Protective headers for wrapped paper rolls that generate lower levels of toxic gases like carbon monoxide and volatile organic compounds (VOCs) during heat sealing compared to conventional headers. The headers have a film coated on the inner surface made from a specific type of linear low density polyethylene (LLDPE) resin called metallocene linear low density polyethylene (mLLDPE). This mLLDPE film on the header substrate is heat sealable and when joined to an interior header during roll wrapping, reduces emissions of toxic gases compared to traditional LDPE films. The mLLDPE film coating on the header provides a protective cap at the roll end while minimizing environmental concerns from the heat sealing process.

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Recyclable laminate structures for flexible packaging that achieve recyclability, barrier protection, and printing properties at lower laminate thicknesses compared to traditional laminates. The laminate has a print film made of ethylene-based polymer and a sealant film with at least 3 layers, including an inner layer with specific properties. The inner layer contains an ethylene interpolymer with density 0.900-0.925 g/cc and melt index 0.5-5 g/10 min. At least one of the inner, middle, or outer layers has a composition with a high Molecular Weighted Comonomer Distribution Index (MWCDI) >0.9 and melt index ratio I10/I2 ≥ 7.0 - 1.2 * log(I2). This composition is made via a specific polymerization process involving ethyl

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Heavy-duty packaging film with low slipperiness and good balance of properties like heat seal strength, impact resistance, and rigidity. The film has an outer layer with specific resin composition and density range. It contains 15-75% metallocene-catalyzed polyethylene with a low melt flow rate (0.1-10 g/10min at 190°C) and a density of 0.860-0.910 g/cm3. The overall layer density is 0.911-0.940 g/cm3. This composition provides slip prevention without sticking or curling issues. The film can be made by coextrusion of layers with the optimized resins.

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Cast polyethylene films with excellent flex crack resistance and good thermal properties without the need for blending with other plastomers or elastomers. The films are made from ethylene polymers with specific properties like a density between 0.900-0.926 g/cm3, melt index (I2.16) between 1.2-6 g/10 min, melt index ratio (I21.6/I2.16) between 20-50, and z-average molecular weight (Mz) greater than 150,000 g/mol. The polyethylene is produced by gas-phase polymerization with a metallocene catalyst containing a hafnium compound. The resulting films have reduced flex cracking compared to conventional polyethylenes after 10,000

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Polyethylene (PE) film with improved barrier properties and mechanical properties for packaging applications. The PE film is made by metallocene catalyzed copolymerization of ethylene and an olefin/alpha-olefin comonomer. The copolymer has a specific composition and molecular weight range. The film also contains chemically treated solid oxide particles in the polymer matrix. The solid oxide is treated with electron withdrawing anions to increase its acidity. This chemically treated solid oxide is used as a catalyst support. The resulting PE copolymer film has reduced moisture vapor transmission rate and improved barrier properties compared to homopolymer. The chemically treated solid oxide particles also improve mechanical properties like impact and tear resistance of the film.

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A new type of polyethylene with improved barrier properties like reduced gas and water permeability. The polymer has a specific composition, molecular weight, and density range. It is prepared using a catalyst system with two metallocene complexes, a treated solid oxide like sulfated alumina, and an organoaluminum compound. The treated solid oxide is prepared by treating the oxide with anions like fluoride or chloride before calcination. The polymer has a density of 0.960-0.967 g/cc and a weight average molecular weight of 100-180 kg/mol. The resulting polyethylene films have reduced gas and water vapor transmission rates compared to conventional PE.

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Heat-sealable film with easy peeling property for packaging applications that provides good peeling strength and appearance over a wide range of sealing temperatures, including above 180°C. The film has at least two layers, a base layer and a seal layer. The base layer is mainly low-density polyethylene, medium-density polyethylene, high-density polyethylene, or polypropylene. The seal layer is a resin composition containing 60-90% polypropylene and 40-10% low-density polyethylene. The polypropylene in the seal layer is 20-80% produced using a metallocene catalyst and 20-80% produced using a Cheegler-Natta catalyst.

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Container for food packaging that provides improved appearance and adhesion compared to conventional containers. The container has a sheet container for the food and a cover film. The sheet container has an inner layer and an adhesive layer on the inner layer that bonds to the cover film. The adhesive layer is made of a specific polyolefin resin composition. This composition includes metallocene-catalyzed polypropylene, metallocene-catalyzed low-density polyethylene, and Ziegler-Natta-catalyzed polypropylene. Thermally bonding the adhesive layer to the cover film at temperatures of 160°C or less prevents deformation and deterioration of appearance.

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Laminated packaging material for liquid foods that balances integrity, barrier properties, and opening ease in a cost-effective way. The packaging has a layered structure with a thin inner layer of mLLDPE (low density polyethylene made with metallocene catalyst) sandwiched between thicker layers of LDPE (low density polyethylene). The mLLDPE layer is 4-20 µm thick, <50% of the total inner layer, and melts at 95-115°C. The lamination layer between bulk and barrier has a thin central mLLDPE layer with thicker LDPE support layers. This allows simplifying polymer handling during lamination. The optimized layer thicknesses improve packaging integrity, barrier, and opening without excessive material use.

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Laminated packaging structure for flexible pouches like food and oil containers that provides improved properties compared to multi-step lamination processes. The laminated structure has two films: a first BOPET film and a second co-extruded film with a polyamide layer and a polyolefin layer. The polyolefin layer uses a specific composition produced by solution polymerization with a catalyst system containing a metal-binding complex. This composition provides desired properties for sealing and standability without the need for separate BOPET and LLDPE layers. The co-extruded film structure provides printability, strength, and sealing in a single lamination step.

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Polyethylene laminated structures for flexible packaging that provide improved recyclability and barrier properties at reduced thicknesses compared to conventional PET/PE laminates. The laminates have a sealant film made of ethylene-based polymer and a printing film with a total thickness of 15-30 microns. The printing film has at least 3 layers. This allows reducing the overall laminate thickness below 50 microns while maintaining strength and barrier properties. The ethylene-based polymers can be produced using specific catalyst systems to achieve desired properties.

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A monomaterial polyethylene laminate structure for flexible packaging that achieves recyclability and strength at lower thicknesses compared to conventional PET/PE laminates. The laminate has a print film of ethylene-based polymer and a sealant film with 3 layers. The inner layer is an ethylene interpolymer with specific density and melt index. At least one layer contains a composition with high Molecular Weighted Comonomer Distribution Index (MWCDI) and high melt index ratio (Iio/I2). This composition can be made by polymerizing ethylene with a specific catalyst system.

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Polyolefin-based resin film that can maintain the interface strength of each layer even when subjected to a high-temperature heat treatment such as °C and suppress peeling of a propylene resin layer and an ethylene resin layer, and a package for heat treatment using the same. The film includes a polyolefin resin composition satisfying the conditions, a polymerized block copolymer polymerized using a metallocene catalyst, and a ethylene resin composition.

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A five-layer film for flexible packaging applications, particularly for bag-in-box packaging, that provides improved strength and performance compared to existing films. The film has a specific layer composition and thickness range. It consists of a metallocene polyethylene/linear low density polyethylene mix outer layer (first layer) in contact with a bonding layer (second layer). The other three layers are a third layer contacting the second layer opposite the first layer, and an inner layer (fifth layer) contacting the third layer. The film thickness is between 0.46 mm and 10.4 mm. This composition and thickness range improves barrier properties, strength, and resistance to rupture compared to existing films.

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A simplified laminate structure for flexible packaging like stand up pouches that replaces the multi-step process with a single-step lamination. The laminate has two films, a BOPET film and a co-extruded film. The co-extruded film has a polyamide layer and an ethylene-based polymer layer. The ethylene-based polymer has specific properties to match the toughness and stiffness of the multi-step laminate. It is made by polymerizing ethylene with catalysts, one being a metal-ligand complex. The co-extruded film structure provides comparable properties without the extra steps.

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Monomaterial polyethylene multilayer films and laminates for flexible packaging that provide recyclability and improved properties compared to conventional multilayer films. The films have at least three layers with two of them made of ethylene-based polymers. The first intermediate layer has a composition with a higher vinyl unsaturation level. This improves the sealing and heat resistance properties. The second outer layer has a lower vinyl unsaturation level for better printability. The films are made by polymerizing ethylene with catalyst systems containing metal-ligand complexes.

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Monomaterial polyethylene laminate structures for flexible packaging that achieve recyclability, strength, and barrier protection at thicknesses lower than conventional laminates. The laminate has a print film of ethylene-based polymer and a sealant film with three layers. The inner layer is an ethylene interpolymer with specific density and melt index. The other layers have compositions with high MWCDI values and high I10/I2 ratios. This composition allows thinner seals with good strength and barrier compared to conventional PE laminates. The laminates are made by polymerizing ethylene in solution with specific catalyst systems.

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Laminated packaging structures for flexible packaging applications like food pouches that provide improved balance between toughness and stiffness compared to multi-stage lamination processes. The structure has a BOPET film laminated to a coextruded film with a polyamide layer and a specific polyolefin layer composition. The polyolefin layer is made by copolymerizing ethylene with optional comonomers using a catalyst system containing a specific hafnium complex. This composition provides better properties compared to conventional polyolefin layers in coextruded films.

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A composite film used to make childproof packaging for transdermal patches that contains a metal layer, an acrylic layer, a polyethylene layer with metallocene polyethylene, and an inner cycloolefin copolymer (COC) layer. The metallocene polyethylene in the polyethylene layer improves adhesion between the polyethylene and COC layers, preventing delamination and disintegration issues when packaging pharmaceuticals. The composite can be used in the packaging of transdermal patches to provide a childproof barrier for the active drugs while preventing delamination and disintegration of the packaging.

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Liquid carton packaging material with improved barrier properties for gases like oxygen while maintaining openability. The packaging material has a unique layer structure. The innermost layer near the product is made of a blend of mLLDPE (metallocene-catalyzed linear low density polyethylene) and LDPE (low density polyethylene). This thin mLLDPE layer provides better gas barrier compared to LDPE alone. The outer laminate layer has three layers: an inner LDPE layer sandwiched between two thinner mLLDPE layers. This supports the mLLDPE and enables high speed lamination. The barrier layer is between the laminate and product layers. By optimizing the thicknesses and compositions of the mLLDPE layers, the packaging material balances improved gas barrier with maintained openability.

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A low-temperature heat sealable linear low density (LLD) film for packaging applications. The film contains a specific composition of 15-25% low density polyethylene (LDPE), 35-45% metallocene resin, and 40-50% plastomer resin. This composition enables low-temperature sealing of the film, like below 135°C, compared to conventional LLDPE films that require higher temperatures. The lower sealing temperature reduces defects when packing liquids or powders, improves packaging productivity, and lowers heat energy consumption.

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Laminate structure for flexible packaging that replaces a three-step lamination process with a simpler two-step process. The laminate has a BOPET film as the outer layer, followed by a co-extruded film. The co-extruded film has an inner polyamide layer and an outer layer made from a specific ethylene-based polymer. The ethylene polymer has a unique comonomer distribution and melt index ratio to match the toughness and stiffness of the three-layer laminate. It is made by co-polymerizing ethylene with catalyst systems containing a specific metal-ligand complex.

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Monomaterial polyethylene laminates for flexible packaging with improved barrier properties, lower thickness, and recyclability compared to traditional multimaterial laminates. The laminates have two polyethylene layers, one an ethylene-based interpolymer made using a specific catalyst, and the other a regular polyethylene. The interpolymer layer provides better barrier properties compared to regular polyethylene. The laminates can have thicknesses below 50 microns, which is lower than conventional flexible packages, and enable recyclability of the entire package as monomaterial polyethylene.

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A resin composition for an intermediate layer in high-speed filling packaging films that provides excellent heat-sealing, heat resistance, and productivity. The composition contains two ethylene/α-olefin copolymers, one with specific properties (melt flow rate and density) and optionally metallocene catalyzed, and high-pressure low-density polyethylene. This composition is used in a three-layer packaging film structure with the intermediate layer made from the specialized copolymer. This allows high-speed filling of hot liquids without melting or fusing the bags while maintaining rigidity and heat resistance.

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Packaging material for preserving the enzyme activity of cysteine protease in powder compositions like tongue coating removers. The packaging material has a laminated structure with an inner sealant layer, a middle metallocene polyethylene layer, and an outer barrier layer. The barrier layer prevents moisture and oxygen ingress to prevent enzyme degradation. The unique laminated structure allows encapsulating the cysteine protease powder without activity loss, unlike regular bags that deactivate the enzyme.

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A heat-sealable film with easy peeling property suitable for packaging containers like food pouches that can be easily opened after sealing. The film has at least two layers, a base layer and a seal layer, with the seal layer containing a specific composition. The seal layer is made of a resin composition containing 60-90% polypropylene (m-PP) produced using a metallocene catalyst and 40-10% low-density polyethylene (LDPE). The m-PP is blended with 20-80% z-PP, a different polypropylene (z-PP) produced using a Cheegler-Natta catalyst. This composition allows stable easy peeling even at high sealing temperatures over 180°C, unlike traditional easy peel films.

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A film for flexible packaging, particularly for bag-in-box packaging, that provides improved strength and puncture resistance compared to conventional films. The film is a coextruded structure with five layers. The outer layers are conventional polyethylene materials. But the middle tie layer is a unique composition of metallocene polyethylene and linear low density polyethylene. This middle layer improves puncture resistance and provides better sealing performance compared to traditional tie layers. The film construction provides better overall bag strength and puncture resistance for bag-in-box applications compared to standard films.

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Packaging film for hot melt adhesives that forms an integral container when sealed around the adhesive. The film is chemically miscible with the adhesive at high temperatures, preventing separation or floating of the film during melting and application. The film is a blend of thermoplastic polymers, including a metallocene-catalyzed polymer, with high propylene content (70-99%) to match hot melt chemistries. The miscibility enables one-piece containers without film removal, preventing contamination and adhesive separation issues.

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Integral packaging films for hot melt adhesives that can mix with the adhesive during melting without separating or floating. The films have specific properties like miscibility, viscosity, strength, temperature range, and storage coefficient to be chemically compatible with various hot melt adhesives. The films are made with blends of thermoplastic polymers, including metallocene catalyzed polymers with high propylene content. This allows the films to surround and mix with the molten adhesive without forming separate layers or clumps. The films prevent adhesive separation, floating, or contamination during melting and transport.

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Multilayer film for pillow packaging that provides improved sealing properties, sealant strength, and film strength compared to conventional pillow packaging films. The film has a surface layer made from a propylene/α-olefin copolymer polymerized with a metallocene catalyst, and a sealant layer containing a propylene homopolymer and an ethylene/α-olefin copolymer. The metallocene copolymer layer has a higher melting point than the sealant layer. This allows lower sealing temperatures while preventing film sticking. The ethylene/α-olefin copolymer sealant layer properties are optimized for balance between film strength and sealing properties. The film thickness and layer ratios are also optimized.

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Monomaterial polyethylene laminate structures for flexible packaging that provide recyclability, strength, and barrier protection at lower thicknesses compared to conventional PET/PE laminates. The laminate has a print film made of ethylene-based polymer and a sealant film with three layers. The inner layer uses an ethylene interpolymer with specific density and melt index. The other layers contain a composition with a high Molecular Weighted Comonomer Distribution Index (MWCDI) and high melt index ratio. This composition is made by polymerizing ethylene with a specific catalyst system.

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Multi-layer film for bags containing flowable materials like dairy products that has improved toughness, particularly under chilled conditions, compared to conventional films. The film has an outer and inner sealant layer containing an ethylene/a-olefin interpolymer composition, along with an optional interposed layer with the same interpolymer. This composition provides better seal strength and bag drop heights when filled with chilled liquids.

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Liquid packaging laminate with improved barrier properties, package integrity, and openability for liquid food containers like cartons. The laminate has a structure with a paperboard bulk layer, a barrier layer, and an outer layer sandwiched between them. The outer layer contains a thin center layer of mLLDPE (metallocene-catalyzed linear low density polyethylene) supported by thinner layers of LDPE (low density polyethylene). Co-extruding the thin mLLDPE layer between thicker LDPE layers allows using pure mLLDPE without blending for improved barrier properties. The thinner mLLDPE layer prevents cracking while the thicker LDPE layers provide adhesion. The thin mLLDPE layer also improves openability without compromising integrity.

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