Homopolymer Polypropylene for Packaging Materials

Recyclable stand-up pouch for beverages made entirely of polypropylene that can be hot filled, sealed, and recycled. The pouch has a thin outer layer for printing and a thicker sealing layer. The outer layer is extruded and glued to the sealing layer. The pouch is formed by connecting the front, back, and base sections using a sealing structure. The sealing layer is thicker than the outer layer to provide sealing properties. The pouch can be hot filled, sealed, and recycled as a single-material polypropylene structure.

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Recyclable stand-up pouch for beverages that is made entirely of polypropylene, is easier to recycle compared to traditional multi-material pouches, and has improved barrier properties. The pouch has separate outer, inner, and base layers all made of polypropylene. The inner layer is thicker than the outer layer to provide sealing. This allows the pouch to be sealed and filled without needing a separate sealing layer. The barrier properties of the polypropylene layers prevent spoilage and evaporation. The pouch can be recycled as a single material instead of separating layers.

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Packaging material with improved recyclability and a method to predict recyclability of packaging containing printing inks, adhesives, and additives. The packaging material contains only propylene-based plastics like polypropylene (PP) and ethylene-propylene copolymers (EPP) to enhance recyclability. The printing ink, adhesive, and additives are selected to decompose at temperatures above 320°C, preventing gas bubbles in recycled material. The decomposition profile is analyzed to predict recyclability.

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Soft polypropylene with low hardness and flexural modulus for applications like packaging, automotive interiors, and medical devices where traditional polypropylene is too stiff. The softness is achieved by a specific polymerization process using high ethylene content, high specific surface area catalysts, and multi-stage reactors. The process involves bulk polymerizing propylene with a small amount of ethylene in two loop reactors to destroy stereoregularity, then gas phase copolymerizing propylene and ethylene in a third reactor to generate high ethylene content ethylene-propylene copolymers with low modulus and hardness.

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Easily recyclable oxygen and moisture barrier packaging material made of polypropylene (PP) that provides superior barrier properties while enabling easy recycling. The packaging has a base film, a multi-layer barrier layer on it containing at least one barrier, and an outer layer on the barrier layer. The barrier layers are formed using deposition and wet coating techniques to combine metal adherence and barrier agents. This allows improved barrier properties by supplementing single barrier materials and merging functions. The use of PP throughout provides recyclability.

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Recyclable multilayer packaging material with improved chemical resistance for applications like pharmaceuticals and personal care products. The material is made of multiple polypropylene (PP) layers bonded together using different adhesives. This allows recyclability since it uses a single plastic type. The PP layers are preferably biaxially oriented PP (BOPP) for strength. The use of PP instead of other plastics like PE provides better chemical resistance against aggressive fillers. The packaging material can be made by adhesive lamination or extrusion lamination.

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A multilayer polypropylene fabric for making bagged products that allows hot sealing like heat-sealable PE films while maintaining mechanical strength like woven PP fabrics. The fabric consists of two layers: an outer layer made of woven PP (WWP) for mechanical strength, and an inner layer made of heat-sealable PP (CPP) for sealing. The fabric can be extruded into PP bags that can be closed using heat sealing like PE bags. The heat sealing temperature is between 110-120°C. The fabric allows hot sealing the bag mouth without affecting the mechanical properties. This provides a 100% PP bag that can be sealed like PE bags but has better recyclability and reusability compared to mixed material bags.

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A multilayer polypropylene fabric for making bagged packaging that can be sealed shut using heat welding instead of sewing. The fabric consists of multiple layers including an outer woven polypropylene layer for strength and an inner thermo-weldable layer for sealing. The outer layer provides mechanical rigidity while the inner layer allows heat sealing to create a watertight closure. The multilayer fabric allows making 100% PP bags that can be sealed shut using existing heat sealing equipment without compromising strength or waterproofing.

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Propylene polymerization process using a sequential loop reactor and horizontal stirred reactor to simplify the production of propylene homopolymers and random copolymers. The process involves prepolymerization in the loop reactor followed by liquid phase polymerization in the loop reactor. The liquid polymer is then vaporized and transferred to the horizontal stirred reactor for gas phase polymerization. This allows direct feeding of the liquid polymer into the gas phase reactor without additional steam vaporization. The sequential reactor setup reduces complexity compared to separate tanks and enables production of both homopolymers and copolymers using a single device.

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Recycling process for polymer food packaging containing BOPP, PE, PET, printing and metalizing agents into polypropylene granules suitable for reuse in applications like injection molding. The process involves shredding, cleaning, drying, densifying, mixing, extruding, and cooling the packaging waste to form high-quality recycled polypropylene with properties like melt flow index and impact strength similar to virgin polypropylene. The recycling process avoids solvents and chemicals.

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A multi-stage polymerization process for propylene to produce high performance polypropylene with improved mechanical and processing properties. The process involves using multiple reactors with differential control to polymerize propylene in both liquid and gas phases. The liquid phase polymerization uses catalysts wrapped in polymer to prevent excessive catalyst fragmentation. This is followed by gas phase polymerization in horizontal stirred bed reactors. The multi-stage process allows customization of polymer properties like molecular weight distribution, crystallinity, and rubber content. It also enables controlling monomer content and volatile organic levels.

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Multi-stage propylene polymerization process using multiple reactors in series to improve polymer properties like fluidity, crystallinity, and impact resistance compared to conventional single-reactor processes. The multi-stage approach involves a liquid-phase polymerization reactor followed by two gas-phase polymerization reactors. This allows differential control over the reaction conditions in each stage to produce polymers with narrow molecular weight distribution in the liquid-phase reactor and wide molecular weight distribution in the gas-phase reactors. The gas-phase reactors also enable higher polymerization temperatures and hydrogen content to further enhance polymer properties.

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Multi-stage propylene polymerization process with differential reactor control to produce high-performance polypropylene with uniform particle size, low monomer content, and improved mechanical and processing properties. The process involves sequential liquid-phase and gas-phase polymerization stages using different reactors connected in series. The liquid-phase stages have narrow molecular weight distribution, while the gas-phase stages allow high ethylene and hydrogen content. This enables customization of polymer properties like fluidity, crystallinity, and impact resistance.

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Process for producing polypropylene with high molecular weight and dispersity using a three-stage polymerization. The process involves a prepolymerization reactor followed by three main polymerization reactors. The prepolymerization uses a hydrogen-propylene feed ratio in the range of 0.00-0.10 mol/kmol. This is then polymerized in the main reactors. The resulting polypropylene has a broad molecular weight distribution, high molecular weight, and high dispersity. The polypropylene can be a homopolymer containing at least 99% propylene units.

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A process for producing homopolypropylene with controlled molecular weight distribution using the Spheripol process. The process involves supplying hydrogen gas at specific concentrations to the loop reactors in the Spheripol system. By adjusting the hydrogen feed, homopolypropylene with molecular weight distributions of 2.5-3.5 or 2.0-2.5 can be obtained while maintaining the desired molecular weight range. This allows tailoring the polymer properties for specific applications by precisely controlling the molecular weight distribution.

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Gas-phase polymerization of propylene using a specific catalyst system to generate self-extinguishing polypropylene with improved morphological properties. The catalyst system contains a magnesium compound, a titanium compound, and a cyclopentadiene derivative as a donor ligand. The catalyst is pre-polymerized before use to improve performance. The process involves carrying out the polymerization in a gas-phase reactor with controlled conditions to minimize fine catalyst particle formation. The catalyst system, pre-polymerization, and reaction conditions allow for high stereoregularity and self-extinguishing polypropylene.

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