Polyethylene in Packaging Applications

Polymeric film, sheet, and wrapper with dead fold characteristics that allows folding, twisting, and reclosing without using adhesives. The structure has multiple layers of low and high density polyethylene (LDPE and HDPE) sandwiched with cyclic olefin copolymer (COC) or ethylene vinyl alcohol (EVOH) barrier layers. This provides barrier properties, tear resistance, and dead folding ability. The outer LDPE layer can have printed inks and sealant coating. The dead folding allows folding the wrapper shut after opening without needing adhesives.

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Packaging film with a low gloss suitable for products like pet food, cereals, and healthcare items. The film has a coextruded layer structure with a first layer containing 5-30% cyclic olefin copolymer (COC) and 70-95% polyolefin. This provides a gloss of <=50% while the COC's higher glass transition temperature improves thermal resistance. The film can be recyclable, have better recyclate quality, and better stiffness compared to conventional films with matte coatings or micron-sized inorganics. The film can be blown or cast oriented, have a barrier layer, and have printed indicia.

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Polyolefin packaging material that is fully recyclable and reusable without special separation steps. The packaging uses a polyolefin bonding adhesive layer made from a modified copolymer of C2-C4 olefins like ethylene and butylene. The copolymer is grafted with maleic anhydride at a ratio of 0.5-5%. This adhesive layer bonds two polyolefin films, like a cast polypropylene and an oriented polypropylene, to create a packaging material that can be directly recycled and reused without separating layers. The modified adhesive provides good bonding strength, transparency, and impact resistance.

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Recyclable flexible packaging film made of similar materials to enable recycling without solvent inks. The film has a crosslinked polyethylene substrate layer made by electron beam treatment, followed by stretching. This is laminated with a sealant polyethylene layer using an adhesive. The crosslinking improves heat resistance and recyclability compared to untreated polyethylene. The thicknesses of the crosslinked layer, adhesive, and sealant are optimized for recyclability. The monolayer and multilayer film structure allows recycling by pelletizing since all layers are the same polyethylene.

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Co-extruded multi-layer polymeric films for packaging flowable products like food and beverages. The films have a unique structure with an inner sealant layer, outer sealant layer, and a thin barrier core layer sandwiched between. The sealant layers are high-density ethylene-alpha-olefin copolymers. The barrier layer is a low-density ethylene-vinyl alcohol copolymer with high ethylene content. This provides good barrier, toughness, and flexibility while maintaining recyclability. The films can be used in bags for flowable products that require refrigeration without leakage or emptying issues.

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Gas barrier film for packaging applications that provides a mono-material packaging solution while maintaining strong adhesion between layers. The film has a base material made of stretched polyethylene with a low probe descent temperature (around 170°C) to enhance adhesion to the heat seal layer. An inorganic oxide layer or oxygen barrier membrane is formed on the base material surface. The film can be used in a laminate structure with another polyethylene layer joined by adhesive. The low probe descent temperature base material enables strong adhesion between the layers without delamination.

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Packaging laminate for food products that meets USDA and FDA requirements for extending shelf life, being recyclable, and having high barrier properties. The laminate has two or more layers of polyolefins like HDPE, LDPE, LLDPE, and PP. The outer layer is a printable HDPE with calcium carbonate. The inner layer is HDPE, LLDPE, and LDPE with an EVOH barrier and compatibilizer. This allows sealing, recyclability, and barrier properties for food packaging. The laminate can also have a middle HDPE layer.

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A stable void-fill packaging material made from a blend of recycled and virgin polyethylene that provides consistent transparency and bubble stability for automated packaging processes. The blend contains at least 50% recycled polyethylene and at least 40% virgin polyethylene, along with moisture scavengers and melt stabilizers to prevent voids and inconsistencies in the film. The recycled and virgin polymers are blended to balance properties like tear strength, impact resistance, and transparency.

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Propylene-ethylene random copolymer compositions for hot fill packaging applications like containers and films for food and beverage packaging. The compositions have propylene as the main monomer, ethylene content around 3-5%, melt flow rates 1-100 g/10 min, and xylene solubles less than 7%. The copolymers are produced using Ziegler-Natta catalysts with alkoxysilane electron donors. The compositions have good stiffness, heat resistance, and transparency for hot filling and sealing food containers.

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A specific multilayer mono-material PE assembly for packaging applications that is environmentally sustainable, recyclable, and provides durability, versatility, lightness, gas and moisture barrier, chemical resistance, and adhesion without adhesives. The assembly has at least two layers of high-density PE (HDPE) and a middle layer of PE blend with lower melting temperature. The HDPE layer prevents softening during sealing, and the lower melting blend layer allows adhesion. This enables recyclability without adhesives while maintaining performance during packaging steps. The HDPE density is 0.935-0.951 g/cm3 and the blend density is 0.911-0.924 g/cm3. The blend composition can vary. The assembly can have additional layers like printed, varnish, metallization, EVOH, or gas barrier coatings

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A mono-material stand-up pouch packaging bag that can be easily recycled since it uses only one type of polyethylene resin for the bag material instead of multiple layers like in conventional bags. The bag has a unique bottom seal design with a convex shape near the connections to the side seals. This shape distributes stress from the bag contents more evenly to prevent concentration at the corners and improve impact resistance. The convex shape also allows the bottom to expand more on the side above the fold line to disperse content loading force.

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Polyethylene-based resin composition and packaging material that has improved moldability, bag-making processability, and film strength when inorganic compounds like calcium carbonate are added. The composition contains an ethylene-α-olefin copolymer with specific properties and an inorganic compound like calcium carbonate. The ethylene-α-olefin copolymer has 6-8 carbon α-olefin units, a melt flow rate of 0.8-4.0 g/10 min, and a melting point of 90-130°C. The inorganic compound content is 50-80% by mass and the copolymer content is 10-50% by mass. This composition enables better film properties when inorganic compounds are added compared to conventional compositions.

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Recyclable polyethylene film for large bags that replaces PET in current laminates to improve recyclability. The film has a core layer sandwiched between tie layers. The core contains olefin block copolymer, low density PE, and high density PE. The tie layers have high density PE and low density PE. This composition provides good drop resistance similar to PET/PET laminates but with all PE for recyclability. The film can be oriented for strength.

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Encoding packaging containers made of rigid plastics like HDPE, PE, PET, and PP for food storage. The encoding is done during the container production process by deep drawing the initial flat plastic sheet into the container shape. Laser treatment on the tool mold inserts creates tiny codes on the inner surfaces that imprint as codes on the container's outer surface during deep drawing. The codes are invisible to the naked eye but can be scanned to read product info, enable recycling tracking, prevent fraud, etc.

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Packaging laminates for food products that meet regulatory requirements and are recyclable. The laminates have two or more polymeric layers, such as an outer layer of high density polyethylene (HDPE) and an inner layer of HDPE, LLDPE, or LDPE with a coextruded ethyl vinyl alcohol (EVOH) barrier. This allows recycling by extruding and pelletizing the laminate, then adding a specific amount of LLDPE for recyclability. The laminate can also have a middle HDPE layer.

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Resin laminate, packaging containers, and a production method for the laminate without adhesives or coatings. The laminate has layers with oxidized surfaces and uses low density polyethylene (LDPE) with density 0.850-0.915 g/cm3 for the intermediate layer. The LDPE density range ensures good peel strength without adhesives. The outer layers can be thermoplastic resins or cellophane. The production method involves plasma treating the outer layer surfaces, sandwching molten LDPE between them, and continuously laminating with ozone treated molten LDPE. This provides peel strength without adhesives or coatings.

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Laminate for standing pouches that can be recycled and allows easy squeezing. The laminate has a substrate layer and a heat-sealing layer. The laminate contains at least 90% by mass of polyethylene. This allows recycling of the pouch as a single material. The high polyethylene content also enables easy squeezing of the pouch contents due to improved stiffness and strength.

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Gas barrier laminate for packaging food using polyolefin substrates that provides good hot water resistance and bending properties. The laminate has a metal oxide layer, an overcoat layer containing PVA, and a softening temperature of 100-170°C for the overcoat surface. This allows using polyolefin substrates like polypropylene or polyethylene for the laminate, which improves hot water resistance and bending compared to using polyester or nylon. The laminate can be used in packaging bags and containers.

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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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Stable void-fill packaging film made with a mixture of recycled and virgin polyethylene resins, moisture scavengers, and melt stabilizers to overcome inconsistencies in recycled resins that affect packaging performance. The film composition contains at least 50% recycled polyethylene, at least 40% virgin polyethylene, a moisture scavenger like calcium oxide, and a melt stabilizer like elastomeric polyolefin. This stabilized recycled polymer blend provides consistent film properties like transparency, bubble stability, and drawdown for void-fill packaging applications. The scavenger removes moisture during extrusion to prevent voids in the film, and the stabilizer improves melt strength and processability. The film can be blown into pillow shapes for cushioning and packaging applications.

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Thin wall blow molded plastic cushions for packaging fragile items like electronics. The cushions are made by blow molding resilient, hollow, thin-walled bodies that snap into openings in packing inserts. The cushions have opposed ends with grooves sized to receive the insert edges. The ends have chamfered edges to create lips between the grooves. The cushions are made of materials like PET, HDPE, PP. They have vented valves to equalize pressure during transport.

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A multi-layer film for bags used to package liquid flowable materials like dairy products. The film has an outer and inner sealant layer containing an ethylene/α-olefin interpolymer, an intermediate layer of the same interpolymer, and a core layer of polyethylene or other polyolefin. The interpolymer provides toughness and seal strength while the core layer provides strength and puncture resistance.

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Paperboard pouch for packaging food that can be manufactured, printed and filled using conventional equipment designed for making standard polymeric bags. The pouch has a multilayer structure with outer layers of extruded polymers on paper to provide barrier and strength. The polymers are coated onto the paper using extrusion coating techniques. The coated paper is then fed into a conventional bag-making machine to form the pouch shape. This allows using existing equipment for making the paperboard pouches at normal production speeds.

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Multilayer food packaging films with migratory active substances that can release compounds into the food or surroundings. The films have discontinuous contact between some layers forming cavities. The layers are directly bonded by welding. The same thermoplastic polymer is used in all layers. This allows controlled release of active substances by tuning permeability through the layers using additives. The cavities disrupt diffusion paths. By using cavities and targeted additives, active substances can selectively migrate through certain layers and release more on one side versus the other.

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Laminated food packaging structure with improved properties like gas barrier, oil resistance, and adhesion. It uses a coating layer with clay and light calcium carbonate blended in an acrylic polymer matrix on one or both sides of the substrate made of a thermoplastic resin containing inorganic filler. This provides benefits like moisture and odor resistance, reduced surface defects, and compatibility with the substrate compared to using clay or calcium carbonate alone. The coating layer is applied before a polyvinylidene chloride layer for oil resistance.

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Recyclable packaging laminates for food products that meet criteria like shelf life extension and recyclability. The laminates have multiple polymeric layers like HDPE, LDPE, LLDPE, and EVOH. The layers can have different resins. The HDPE outer layer provides strength and recyclability, while the inner layer with EVOH barrier prevents gas permeation. The EVOH-coated inner layer allows sealing and recycling with LLDPE. The laminates can have printing on the HDPE layer. The laminates can also have a core HDPE layer sandwiched between the outer and inner layers. The HDPE layers provide puncture resistance. The laminates can be recycled by extruding and pelletizing the laminates with added LLDPE.

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Recyclable flexible packages that can be easily separated into their component materials for recycling. The packages use a high oxygen barrier laminate made of a single polymer like polyethylene. An inner layer between the polymer layers is water-soluble, allowing separation when washed. This allows recycling the majority polymer layer while avoiding contaminants from the barrier layers.

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Recyclable packaging for food products that meets regulatory requirements and provides extended shelf life. The packaging is made of multiple layers of polyolefin films, with a coextruded ethylene vinyl alcohol (EVOH) barrier layer sandwiched between inner and outer layers. The inner layer can have a composition like HDPE, LLDPE, and LDPE, while the outer layer can be a print layer or a layer like HDPE, LDPE, and MDPE. This allows recycling the packaging by extruding and pelletizing it, then adding a specific amount of LLDPE for recyclability. The packaging can also have a degassing valve and printable outer layer for customization.

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Encoding packaging containers made of dimensionally stable plastics like HDPE, PE, PET, and PP for storing consumer goods like food, without adding stickers or labels after production. The encoding is achieved during deep drawing of the plastic sheet into the container shape by creating codes on the outer surface using laser ablation of the mold inserts. This embeds the codes invisibly into the container wall. The mold inserts have shaped regions on the inner surface that leave corresponding patterns on the outer surface during deep drawing. This allows encoding the containers with multiple codes at various positions without adding stickers. The embedded codes can be read easily and reliably for identification and tracking without labels that can degrade or peel off.

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A monomaterial laminate structure for flexible packaging that provides recyclability while maintaining barrier protection and printing properties. The laminate structure has a sealant film and a print film laminated to the sealant film. The print film has an outer layer, an inner layer, and a middle layer. The middle layer is high density polyethylene (HDPE) with specific properties. The inner and outer layers are linear low density polyethylene (LLDPE). The HDPE provides stiffness and prevents stretching during printing. The LLDPE layers provide gloss and clarity.

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Recyclable films for high performance packaging applications that can be recycled in the polyethylene recycling stream without additional compatibilizers. The films have improved heat resistance and recyclability by orienting, annealing, and irradiating a polyethylene base film to crosslink the surface. This prevents shrinking and scuffing at high temperatures. The films can be sealed to themselves or other components using a compatible sealant. The irradiation crosslinking prevents sticking during heat sealing and enables hermetic seals. The films have low machine and transverse shrinkage of <10% at 90°C. The irradiation crosslinking also improves clarity, toughness, and seal initiation temperature compared to untreated films. The recyclable films can be used to make packages that can be recycled in the PE stream without needing additional compatibilizers.

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Bottle closure assemblies made from a specific polyethylene composition that provides good processability, dimensional stability, organoleptic properties, and stress crack resistance. The composition has a first ethylene copolymer with low melt index (10 g/10 min or less) and low density (0.920-0.960 g/cm3) and a second ethylene copolymer with higher melt index (50 g/10 min or more) and higher density (0.970 g/cm3 or less). The ratio of short chain branches per thousand carbon atoms in the two copolymers is greater than 0.5. This composition allows making bottle closures with tethered retaining means by molding the closure, tether, and retainer all from the same polyethylene.

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Multilayer film for batch inclusion packages that can be used to contain low melting point materials without sticking to the packaging. The film has three or more layers, with skin layers made of a low density polyethylene (LDPE) blend and a core layer containing a propylene-based plastomer. The skin layers have densities below 0.90 g/cc and the core layer below 0.90 g/cc. This allows the film to have a low melting point and good sealing properties for low melting point contents.

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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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Liquid carton packaging material that balances improved openability and package integrity by using a specific layer configuration and thicknesses in the laminate structure. The laminate has a three-layer center layer sandwiched between two support layers. The center layer contains mLLDPE for improved strength, but keeping it thin to prevent impairing openability. The support layers are LDPE that provide adhesion and support. This allows using mLLDPE in the center without slowing down the lamination process. The inner layer is mLLDPE blended with LDPE coated onto the barrier layer. The thinner mLLDPE layer on the inside improves openability while maintaining barrier properties.

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Easily tearable film with high oxygen barrier properties and low elastic modulus, suitable for packaging applications. The film contains a blend of semi-aromatic and aliphatic polyamides. The semi-aromatic polyamide has specific chemical structures with diamine units derived from metaxylylenediamine and dicarboxylic acid units from linear aliphatic dicarboxylic acids. The blend ratio is 20-70 wt% semi-aromatic polyamide and 30-80 wt% aliphatic polyamide. This composition provides excellent linear tear strength, high oxygen barrier, and low elastic modulus.

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Liquid packaging carton with improved barrier properties and openability for long-term storage of liquid foods. The carton has a laminate structure with a thin center layer of mLLDPE sandwiched between thicker layers of LDPE. This allows using mLLDPE in the critical laminate layer without impairing openability. The mLLDPE layer is kept thin and supported by the LDPE layers. The mLLDPE provides better barrier while the LDPE layers provide adhesion and mechanical strength. The thin mLLDPE layer reduces barrier impairment compared to thicker mLLDPE layers.

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Composite materials and products made from recycled materials like multilayer packaging to reduce cost and environmental impact. The composites can have improved properties compared to virgin material composites. The recycled materials used include polyethylene, polypropylene, olefin, ionomer, polyester, and metal fillers. The composites can have higher strength, stiffness, and moisture resistance. The recycled materials are optimized through pre-drying, coupling agents, and higher processing temperatures. The composites also have benefits like heat dissipation and static charge reduction due to the metal filler.

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Barrier films made from a specific blend of high density polyethylene (HDPE) resins with improved moisture barrier properties for food packaging. The blend contains two HDPE resins with different melt indexes (MI) and densities, along with a small amount of a calcium salt. The higher MI HDPE resin has a density of 0.950-0.975 g/cc and MI > 10 MI/g. The lower MI HDPE resin has a density of 0.955-0.965 g/cc and MI < 5 MI/g. The blend is extruded into film at a specific ratio of MI values (I2 > 10) to improve moisture barrier compared to using the same HDPE resins without the calcium salt.

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Bottle closure assemblies made from a specific polyethylene composition for improved processability and stress crack resistance. The assemblies have a cap, tether, and retaining means. The cap covers the bottle opening. The tether connects the cap to the retaining means. The polyethylene composition has 10-70 wt% of a low melt index, low density copolymer (SCB1) and 90-30 wt% of a higher melt index, higher density copolymer or ethylene homopolymer (SCB2). The SCB1/SCB2 ratio is >0.5. This composition enables good processability and stress crack resistance for making the closure assemblies.

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A packaging material for food products that replaces traditional materials like high impact polystyrene (HIPS) and polyvinylidene chloride (PVdC) to avoid migration of styrene and chlorine into food. The packaging is made from a compatibilized polymer blend with a specific morphology that can replace HIPS/PVdC in ambient fill technologies. The blend includes post-consumer recycled PET, polypropylene, ethylene methyl acrylate, and ethylene/methyl acrylate/glycidyl methacrylate terpolymer. The blend provides oxygen barrier, impact resistance, and trim force reduction.

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A film for packaging microorganism culture media that provides improved shelf life and moisture control. The film contains at least one layer of polyethylene terephthalate (PET) and at least one heat-sealing layer like polyethylene (PE). The film has a water vapor permeability of 10-80 g/m2/day. This range allows controlled water loss to prevent drying while preventing excessive condensation. The film can be used to package culture media and provide reusable/reclosable containers that maintain moisture levels after opening. The film's properties prevent premature drying or excess condensation compared to traditional films.

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Thin, high-performance polyolefin film for wrappers like hygiene product packaging that uses less material compared to conventional films. The film has a thickness of ≤20 μm (0.0008 mil) and provides sufficient mechanical properties like tensile strength for wrapping applications. The film can be a single-layer or multi-layer structure with specific properties. The single-layer film has a polyolefin base with a release coating on one side. The multi-layer film has two polyolefin layers with thicknesses of ≥4 μm each. This thin film reduces material usage compared to thicker films while maintaining performance. The thinner film is also heat-resistant to prevent shrinkage during processing.

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Packaged inflatable life raft for aircraft that reduces weight while meeting regulatory requirements for stowage and flammability. The life raft is enclosed in an enclosure with a specialized multi-layer film. The innermost layer closest to the life raft is heat-sealable polymer like PE, PP, or halogenated polymer. Outer layers have metal foil, vapor barrier, or fire retardant polymer like polyester/polyamide. This layer combination provides containment, flammability resistance, and weight savings compared to traditional enclosures.

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A multilayer structure for packaging materials that maintains gas barrier properties after extrusion coating lamination. The structure includes a layered product with a base, aluminum layer, and phosphorus compound layer. A thermoplastic resin layer is stacked on the layered product. The thermoplastic resin layer is a polymer containing an α-olefin unit. The thermoplastic resin layer is formed by extrusion coating lamination. The structure has a gas barrier layer that maintains barrier properties even after extrusion coating.

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A multilayer metallized cast film for packaging applications that provides improved barrier properties and appearance compared to traditional cast films. The film has a core layer of high density polyethylene (HDPE) with a density of 0.94 g/cc and melt index less than 1.3 g/10 min. The core layer is surrounded by two external layers, one of which has a metal and/or metal oxide layer. The outer layers can be made from polyethylene with a density greater than 0.94 g/cc and melt index greater than 2.0 g/10 min.

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Polyolefin packaging container with improved inverted fall-down performance for contents like ketchup. The container has an inner layer made of polyolefin resin that contains a specific lubricant, ethylenebis fatty acid amide, in a specific bleeding range. The ethylenebis fatty acid amide is blended into the polyolefin resin at 0.2-1% for PE or 1.2-5% for PP. The amide bleeds onto the inner surface in an amount of 12.5-200 mg/m2, especially 12.5-100 mg/m2, to form a layer that helps contents slide out easily when the container is inverted. This prevents sticking and makes it easier to empty the container. The amide bleeding amount is optimized to provide the best fall-down performance without excessive bleeding. The container

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Barrier films made from high density polyethylene (HDPE) resins with improved water vapor transmission rate (WVTR) for food packaging. The films are prepared by blending two HDPE resins with different melt indices and adding a small amount of a calcium salt of 1,2-cyclohexanedicarboxylic acid. The blended HDPE resins have a density of 0.950-0.975 g/cc and a high melt index resin to low melt index resin ratio greater than 10:1. The calcium salt improves barrier properties compared to the unmodified blend. The films have 20-61% lower WVTR than a control without the salt.

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Packaging film with reduced carbon footprint compared to traditional olefinic polymers. The film has a core layer sandwiched between outer layers. The core and outer layers are made from a polymer composition containing ethylene polymer, nanoclay with organic surface treatment, and a compatibilizer with olefin and polar components. The nanoclay content is 0.1-20 wt%, ethylene is 70-99 wt%, and compatibilizer is 0.05-15 wt%. This composition allows reducing petroleum-derived polymer content while maintaining good mechanical properties for packaging applications.

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A sustainable plastic laminated film for packaging soap bars using envelope wrapping method. The film has three layers: two layers of polyester sandwiched between a thin layer of polyethylene. The intermediate polyethylene layer provides softness and bonding without increasing film thickness. This prevents reverse curling and improves adaptability on packaging machines compared to two-ply polyester films. The balanced layer thicknesses also enable online laser coding without thickening the film.

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