Developments in Metallocene Polyethylene for 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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Flexible container carrier for packaging multiple containers with improved elastic recovery after container insertion. The carrier has a flexible sheet with primary apertures for receiving container parts. The sheet is made with a specific polymer composition containing a high percentage of hexene, like 11-24%, in addition to propylene and ethylene. This composition provides better elastic recovery after stretching during container insertion compared to conventional polyolefin blends.

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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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Laminate with high gas permeability and heat sealability for packaging applications. The laminate has a base material and a heat-sealing layer on one side. The heat-sealing layer is made from a copolymer of 4-methyl-1-pentene and an alpha olefin with 2-20 carbon atoms, plus optionally modified versions. The 4-methyl-1-pentene content is 50-99 mol% and the alpha olefin content is 1-50 mol%. This balances gas permeability and heat sealability.

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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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Multi-layer films for bags used to package flowable liquids like dairy products that have improved toughness and seal strength, especially under refrigerated conditions. The films have an outer and inner sealant layer containing an ethylene/α-olefin interpolymer, with optionally an intermediate layer between them also containing the interpolymer. This composition improves bag performance when filled with chilled liquids compared to conventional films. The interpolymer composition has specific properties like density and melt index.

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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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High density ethylene copolymers with uniform melting behavior for improved processing and sealing properties in films. The copolymers have densities of 0.890-0.915 g/cm3, molecular weight distributions Mw/Mn of 2.2-4.5, and Mz/Mw greater than 2. They also have comonomer distributions that range from normal to flat, CDBI50 values of 55-98, and single peaks in DSC measurements. The copolymers are made using single site catalysts in continuous polymerization processes.

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