High-Density Polyethylene in Package Construction

High-density polyethylene (HDPE) resin composition with improved environmental stress cracking resistance for applications like containers and pipes. The composition contains a blend of HDPE and an ethylene-α-olefin copolymer resin made using metallocene catalyst. The HDPE has a melt flow index (MFI) of 100-300 g/10min and density of 0.950-0.980 g/cm3. The copolymer resin has a lower MFI and density compared to HDPE. Blending the HDPE and copolymer resin in a specific ratio provides a final composition with enhanced environmental stress cracking resistance while maintaining desirable properties like uniformity, processability, and tensile strength.

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High-density polyethylene composition and molded articles with improved properties for applications like beverage container closures. The composition contains two types of polyethylene: an ethylene alpha olefin copolymer with specific melt flow and density ranges, and an ethylene homopolymer. The copolymer provides impact strength and the homopolymer provides rigidity. The weight ratio of the copolymer to homopolymer is 35-65:65-35. The composition is melt-kneaded to prepare the molded articles like bottle caps. The copolymer's low-temperature impact strength and environmental stress cracking resistance are improved compared to homopolymer-only compositions.

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Multimodal polyethylene blends with improved mechanical properties for applications like pipes. The blends contain a high-density bimodal polyethylene component and an ultrahigh molecular weight polyethylene (UHMWPE) homopolymer or copolymer component. The blending process allows incorporating UHMWPE into the bimodal HDPE matrix at commercially relevant loads. This improves the blends' mechanical properties compared to blends with isolated UHMWPE regions. The blends have a density of at least 925 kg/m3 and a MFR21 of 0.05-10 g/10 min.

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Paper packaging material for filling and packaging of liquid foods that has improved barrier properties, seal strength, and compatibility with liquid contents. The packaging material is a multilayer laminate with specific thermoplastic layers. The outer layer is a low-density polyethylene (LDPE) made from metallocene catalyst with narrow molecular weight distribution. The inner layer is also LDPE but with a wider molecular weight distribution. An intermediate adhesive layer connects the barrier layer (e.g., aluminum foil or inorganic oxide film) to the innermost LDPE layer. This configuration provides good barrier properties, seal strength, and compatibility with liquid foods compared to conventional packaging materials. The multilayer structure allows optimized sealing and conversion properties during manufacturing.

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Blend of high-density polyethylene (HDPE) resins with improved environmental stress crack resistance (ESCR) for injection, blow, and compression molding applications. The blend comprises a lower molecular weight multimodal HDPE component with density ≥ 940 kg/m3 and a higher molecular weight HDPE component. The lower molecular weight HDPE component has density ≥ 950 kg/m3 and an MFR of ≥ 50 g/10 min. The higher molecular weight HDPE component has density ≥ 950 kg/m3 and an MFR of ≤ 1.0 g/10 min. The blend provides ESCR ≥ 30 hours at 50°C and 6 MPa, which is higher than blends with only lower molecular weight HDPE.

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A packaging container for liquid foods that prevents leakage and oxidation while maintaining product quality. The container has an outer layer, core, inner layer, barrier, adhesive, and innermost layer. The adhesive layer between the barrier and innermost layers is made of specific metallocene-catalyzed linear low-density polyethylene (mLLDPE) with specific density, melt flow index, melting point, and expansion ratio. This optimized adhesive layer provides strong bonding between the barrier and innermost layers to prevent leakage and oxidation.

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Laminated packaging material for liquid food that prevents contamination and prolongs shelf life. The packaging has a multi-layer structure with an inner layer containing metallocene catalysts polymerized linear low density polyethylene (LLDPE) and low density polyethylene (LDPE). This inner layer has specific density, flow index, melting point, and expansion ratio ranges. The outer layers are thermoplastic materials. The LLDPE/LDPE inner layer prevents contamination by reducing surface tension and preventing product adhesion. It also has better barrier properties. The specific LLDPE/LDPE composition helps prevent neck shrinkage during filling. The packaging method involves extrusion, lamination, and forming.

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Laminated packaging material for liquid food products that provides improved sealing properties and reduced defects compared to conventional materials. The packaging material has a multilayer structure with an outermost layer made of metallocene catalyst-polymerized linear low density polyethylene (mLLDPE) and low density polyethylene (LDPE). This outer layer improves sealing and prevents defects during extrusion and lamination. The core, barrier, and innermost layers are conventional materials. The mLLDPE with specific properties like density, melt flow index, and melting point provides better sealing without necking during extrusion.

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Laminated packaging material for liquid food that improves barrier properties and reduces defects compared to conventional multilayer packaging. The laminated structure has an outer thermoplastic layer, core layer, intermediate thermoplastic layer, barrier layer, and inner thermoplastic layer. The intermediate layer contains a specific type of linear low density polyethylene (mLLDPE) made using a metallocene catalyst. This mLLDPE has properties like low density (0.88-0.925 g/cm3), low melt flow index (5-20 g/10min), narrow melting point range (85-130°C), and expansion ratio (1.2-1.8) that enhance barrier properties in the intermediate layer. The mLLDPE in the intermediate layer improves bond strength between the core and barrier layers, preventing leakage of liquids through the packaging

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Packaging material with improved properties like durability, flexibility, brightness, and transparency compared to conventional packaging materials. The packaging material contains a unique composition of polymers like metallocene-based linear low density copolymer, low melting flow rate low density polyethylene, high density polyethylene, and high density polypropylene. This combination provides benefits like faster sealing, better load-bearing capacity, reduced deformation, enhanced strength, brighter appearance, and lower haze compared to conventional packaging materials.

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High density polyethylene copolymer with improved properties for injection molding applications. The copolymer has a density range of 0.935-0.952 g/cm3, melt index (I2) of 30-75 g/10 min, I21/I2 ratio of 13-35, Mw/Mn ratio of 3.5-8, and brittleness temperature below -20°C. The copolymer is prepared by co-polymerizing ethylene with alpha-olefins, and has improved properties like impact strength and brittleness at low temperatures compared to conventional HDPE.

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Polyethylene composition with improved balance of rigidity and impact resistance for applications like films. It contains a high density metallocene PE with density 0.947-0.970 g/cm3 and MWD < 4, along with other polyolefins like LDPE, LLDPE, MDPE, HDPE, EVA. The metallocene PE provides rigidity, while the other PE types boost impact resistance. The composition allows thinner films with comparable rigidity and impact resistance to conventional PE films.

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Laminate structure for packaging materials like food containers that provides improved integrity and opening properties compared to conventional packaging materials. The laminate has an outer layer with a thermoplastic resin layer sandwiched between paper layers, an inner barrier layer with an adhesive layer, a polyethylene layer containing a polycycloolefin copolymer, and an innermost layer of linear low-density polyethylene made with metallocene catalysts. This laminate configuration enhances container strength and seal integrity while facilitating easy opening.

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Thermoplastic polymer resins with improved stiffness and environmental stress crack resistance compared to conventional polyolefins. The resins have a unique composition and structure that provides the balance of properties. They contain a high-density, low-molecular-weight polyethylene component and a low-density, high-molecular-weight ethylene copolymer component. The key difference is that the rheological polydispersity of the high-density component exceeds that of either the resin or the low-density component. This is achieved by polymerizing ethylene initially to make the high-density component, then adding more ethylene and comonomer in a second reactor to make the copolymer component. The resins are useful for films, coatings, fibers, and molded articles.

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Polyethylene resin composition for heavy-duty packaging bags that provides improved low-temperature properties, such as drop bag strength, for bags used in cold areas. The composition has a specific melt flow rate, density, and tension range. It uses a blend of linear low-density polyethylene (LLDPE), linear medium/high-density polyethylene (LDPE/HDPE), and high-pressure low-density polyethylene (HLLDPE). The blend ratios are 40-70% LLDPE, 1-55% LDPE/HDPE, and 5-29% HLLDPE.

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A polyethylene molding composition for improved properties like rigidity, toughness, and stress cracking resistance in molded parts without significantly impacting flowability. The composition contains a balanced blend of high density, high molecular weight ethylene polymers. The composition consists of 40-90% of a high density ethylene polymer and 10-60% of a linear low density ethylene polymer. The high density polymer provides rigidity and stress crack resistance, while the linear low density polymer improves toughness without significantly increasing melt index or decreasing modulus.

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Linear low density polyethylene (LLDPE) with specific short chain branching distribution at very low densities. The LLDPE has a density range of 0.87-0.918 g/cc, and a unique branching ratio of zi/zo. This composition provides improved properties like lower n-hexane extractables and better heat sealing compared to conventional LLDPE at similar densities. The specific branching distribution allows lowering density without increasing extractables.

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A packaging material for photosensitive materials like photographic film that is strong enough to prevent breakage and puncture during handling without being laminated. The material is a single film made from a specific blend of polyethylene resins. It contains 5-30 wt% of high density polyethylene (HDPE) with high melt index (>0.5 g/10 min) and density (>0.950 g/cm³), 50 wt% of linear low density polyethylene (L-LDPE), and 0.1-20 wt% of a light-shielding material. The HDPE provides strength and resistance to sharp edges, while the L-LDPE balances properties. The light-shielding material blocks light.

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Packaging material for photosensitive materials like film for photographic purposes that is light-shielding, moisture-proof, tear-resistant, puncture-resistant, and flat. The material contains a specific type of low-density polyethylene (LDPE) with carbon black. The LDPE has a density of 0.925 g/cm3, 2% olefin content, and 3% carbon black. This LDPE provides superior physical properties and heat sealing compared to conventional LDPE-based packaging films. The carbon black also improves light-shielding. The LDPE is molded into films using existing equipment. Additives like lubricants are also used to enhance film formation.

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