Developments in Linear Low-Density Polyethylene for Packaging

Pouch container for holding liquids containing hydrogen peroxide that prevents inner layer degradation over time. The pouch has an inner layer made of low-branch density polyethylene with a specific dynamic viscoelasticity profile. The complex viscosity at 10 rad/s (A) is lower than at 0.1 rad/s (B), with B/A ≤ 2.5. This linear polyethylene structure is less susceptible to active oxygen attack and deterioration compared to branched polyethylene, reducing inner layer breakdown when storing hydrogen peroxide solutions for long periods.

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Bottle cap assembly made partially from a specific polyethylene composition that enables good processing and stress crack resistance. The cap, tether, and retaining portion can be molded integrally or separately. The polyethylene composition has a low melt index (<1.0 g/10 min) and high short chain branch density (SCB) in one copolymer (10-70 wt%) compared to another copolymer (90-30 wt%) with higher melt index (>20 g/10 min) and lower density (>0.970 g/cm3). This composition balances processability and stress crack resistance for molding complex cap assemblies.

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Bottle closure assembly with a tethered cap that provides improved retention when the cap is removed. The assembly has a cap, tether, and retaining means. The cap covers the bottle opening, the tether connects the cap to the retaining means, and the retaining means attaches to the bottle. The cap, tether, and retaining means are made from a polyethylene composition with specific properties for good processability, organoleptic properties, dimensional stability, and stress crack resistance. The composition has a low melt index (<10 g/10 min), a high density first ethylene copolymer (0.920-0.960 g/cm3), and a lower density second ethylene copolymer (>0.960 g/cm3). The ratio of short chain branches in the first copolymer vs the second copolymer is

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Multi-layer film packaging with improved heat-sealing properties and reduced foreign material formation during manufacturing. The packaging uses a multi-layer film with a surface sealing layer made of linear low density polyethylene (LLDPE). The sealing layer contains PTFE polyethylene with a specific molecular weight distribution (Mw/Mn) of 3 to 7. This PTFE-LLDPE sealing layer prevents delamination and adhesion during heat sealing while inhibiting foreign material buildup on the die.

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Packaging system with multiple independent packaging devices arranged in line to increase throughput without lengthening the production line. The system has a first conveyor feeding articles to multiple adjacent packaging devices. Each device individually receives articles from the conveyor instead of having a single centralized feeder. This allows doubling the conveyor throughput by having two devices process simultaneously instead of needing separate weighing/pricing machines. The devices can be synchronized to alternate feeding if necessary. This compact multi-device layout increases processing capacity per line length compared to separate machines.

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Resin film with reduced fossil fuel usage and improved packaging opening properties. The resin film is made from biomass-derived polyethylene, with specific composition and molecular weight distribution. The film contains biomass-derived linear low-density polyethylene (LLDPE) and low-density polyethylene (LDPE), but no biomass-derived chain LDPE. The biomass degree is 5% or more, and the molecular weight distribution has 12% or less area below 30,000 Da. This film reduces CO2 emissions by using biomass instead of fossil fuels. It also improves opening properties of packaging made with this film, like bags, by reducing the content of low molecular weight components.

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Bottle closure assemblies with improved stress crack resistance and dimensional stability for long flow path molding processes like tethered closures. The closure components are made from a polyethylene composition with specific ethylene copolymer ratios. It contains 10-70 wt % of a low melt index copolymer (Mi ≤ 10 g/10 min) with density 0.920-0.960 g/cm3, and 90-30 wt % of a higher Mi copolymer (Mi ≥ 50 g/10 min) with density higher than the first copolymer but less than 0.970 g/cm3. The ratio of short chain branch density in the two copolymers (SCB1/SCB2) is >0.5. This polyethylene composition

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A pouch made from a laminate with a specific structure that allows heat sealing at lower temperatures compared to conventional pouches. The pouch is at least partially composed of a laminate with a base material made of polyethylene and a heat-sealing layer. The heat-sealing layer has a density of 0.920 g/cm3. The pouch has an innermost polyethylene resin layer (1) followed by a resin layer (2) containing linear low-density polyethylene and low-density polyethylene. This configuration allows heat sealing at lower temperatures while maintaining strength and barrier properties.

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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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Bottle closure assembly with an integrated tether that prevents loss of the cap when removed from a bottle. The assembly comprises a cap, tether, and retaining portion all made from a polyethylene composition with specific properties. The polyethylene has a low melt index (less than 1.0 g/10min), high short chain branch density (0.920-0.960 g/cm3), and high short chain branch ratio (>0.5) to enable good processability and stress crack resistance. The high density ethylene copolymer (20-10000 g/10min) provides strength. This allows complex molded shapes like the tether that connects the cap to the bottle. The polyethylene composition has elongation at break >600%, tensile strength >20 MPa, and melt index 0

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Polyethylene-based sealant film for packaging applications with improved sealing performance on high-speed packaging machines. The film has a core layer made of a composition with specific linear low density polyethylenes, and an inner layer with an ethylene polymer. The core layer composition balances mechanical properties needed for extrusion and lamination. The inner layer helps sealant film adhesion. The optimized core and inner layer compositions provide better sealing on FFS machines compared to conventional polyethylene films.

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Flexible container carrier for efficiently unitizing and carrying containers like cans, bottles, jars, etc. The carrier has a flexible sheet with multiple apertures for holding container portions. The carrier improves elastic recovery after stretching during container insertion. It achieves this by using a specific polymer composition for the sheet, including recycled branched and linear low-density polyethylene (LDPE) with vinyl acetate. The blend has a vinyl acetate content of 2-6%. This composition provides better recovery compared to using pure recycled LDPE.

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Laminate structure for packaging materials like bags that improves tear resistance and prevents leakage when filled with contents like detergents or hydrogen peroxide. The laminate has a layer containing LDPE and C-4LLDPE with 30% or more LDPE content. This layer is sandwiched between a substrate and a sealant layer with a seal layer containing C-4LLDPE and C-6LLDPE. The sealant layer thickness is 5-40% of the total laminate thickness. The C-4LLDPE/LDPE ratio in the middle layer is 25-75%. This laminate structure provides balanced strength, tear resistance, and leak prevention for the packaging material.

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A laminate for packaging bags that provides high biomass content while maintaining good impact resistance and hand-cutting properties. The laminate has layers of materials including a base layer, a metal vapor deposition layer, a second base layer, and a sealant layer. The sealant layer contains a biomass-derived linear low density polyethylene (LLDPE) and a low-density polyethylene (LDPE), with a thickness of 30-150 microns. This composition provides both impact resistance and hand-cutting properties when used to seal packaging bags. The laminate can be made with biomass-derived LLDPE and LDPE, or a combination of biomass and fossil fuel derived LLDPE and LDPE.

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Sealant for packaging of silicon materials with good slipperiness, transparency, and cleanliness. The sealant has a fractal dimension D between 1.50 and 1.90 and a persistent homology N10 of 1.0 or higher on the surface facing the silicon material. It contains a first portion with low density polyethylene (LDPE) and a second portion with linear low density polyethylene (LLDPE). The fractal dimension indicates surface complexity and cleanliness, with lower values indicating more irregularities. The persistent homology measures surface topology and cleanliness. The specific values provide balance between slipperiness, transparency, and cleanliness required for packaging silicon materials.

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A film, laminate, packaging bag, and back-in box with reduced blocking during storage at room temperature. The film contains a polyethylene composition with specific ratios of linear ethylene copolymer and low-density polyethylene, along with a modifier. The laminate has layers with at least one made from this film. The packaging bag and back-in box use the laminate. The composition provides flexibility and reduced blocking compared to regular polyethylene films.

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Sealant film for packaging bags that reduces environmental impact and improves drop resistance and pouch rigidity compared to conventional films. The sealant film contains a specific low-density polyethylene with a melt flow rate of 7 g/10min or less, and a linear low-density polyethylene. The low-density polyethylene is plant-derived. The film thickness is 70-190 microns. This composition allows thinner, plant-based films with better performance in pouch packaging bags.

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Uniaxially oriented multilayer films with low cabling and improved mechanical properties for flexible packaging applications. The films have a unique layer composition and stretch ratio for orienting in the machine direction. The outer layers contain polyolefin plastomers like ULDPE and single-site catalyzed LLDPE with specific density and melt index ranges. The inner layers have ULDPE and a second composition like LLDPE. Stretching at 4:1 to 10:1 orientation ratio provides low cabling while maintaining high 2% MD modulus. The films have balance of stiffness, optical properties, and low tear strength for converting and end-use performance.

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Linear motor transport system for packaging and other uses with improved guideways, vehicles, and switching sections. The guideway has regions with aligned coils orthogonal to vehicle motion. Coils are on one side of vehicles in some regions. This enables vehicles to be propelled by coils on one side only in those regions. The guideway can have merging/diverging sections with coils on both sides downstream to facilitate vehicle movement after branching. The vehicles have magnets centralized in the body and engage the guideway surface. This allows compact guideways, minimizes space required, and maximizes processing capacity by enabling complex packaging, assembly, and other operations.

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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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