Cast Polypropylene in Flexible Packaging

Thin-wall injection molding polypropylene resin with improved properties for applications like thin-wall containers and food packaging. The resin contains specific amounts of components like polymer nucleating agent, antioxidant, and halogen absorber. This optimized composition provides fast crystallization, good balance of rigidity and toughness, aging resistance, dimensional stability, low odor, and high gloss. The reduced nucleating agent dosage makes the resin more environmentally friendly.

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Polypropylene-based packaging material with improved drop impact resistance, blocking resistance, sliding properties, and flavor properties for food packaging applications. The material contains a spindle-shaped dispersed phase of polypropylene elastomer in a matrix of polypropylene resin. The elastomer particles have aspect ratios of 1.2-9.0 and sizes in the range of 3-10 μm. This provides impact resistance, blocking prevention, and sliding properties at low temperatures without sacrificing flavor. The elastomer composition and processing conditions are optimized to achieve the desired dispersed particle shape and size.

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Polypropylene material composition and polypropylene material for injection molded products like food, medicine, and cosmetic packaging that balances toughness, hardness, and transparency. The composition contains polypropylene and an ethylene-α-olefin copolymer with specific properties. The ethylene-α-olefin copolymer has a melt index of 0.1-20 g/10 min and high dispersion of α-olefin units. The polypropylene has a higher melt index. This composition provides improved impact resistance, clarity, and stiffness compared to traditional polypropylene.

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Recycled polypropylene for hot drink rigid packaging that has improved heat resistance and rigidity compared to conventional recycled PP. It contains 80-120 parts of homopolymerized recycled PP, 0.04-1% of a crystalline nucleating agent, 0.04-1% of a halogen absorber, and 0.04-1% of an antioxidant. The nucleating agent, halogen absorber, and antioxidant are added to the recycled PP during preparation. This composition enables the recycled PP to have higher heat distortion temperature and flexural modulus suitable for hot drink containers.

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Polypropylene-based packaging material with improved drop impact resistance, blocking resistance, slipperiness, and flavor properties at low temperatures. The material contains a phase dispersion structure with spindle-shaped polypropylene elastomer domains dispersed in a matrix of polypropylene-based resin. The elastomer domains have aspect ratios of 1.2 to 9.0 and minor axis of 0.2 to 4.0 μm and major axis of 0.5 to 5.0 μm. The elastomer content is 1 to 30 parts by mass based on 100 parts of polypropylene resin. This provides good impact resistance, blocking resistance, slipperiness, and flavor properties while maintaining appearance characteristics.

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A polypropylene-based packaging material that has drop impact resistance, blocking resistance, slipperiness, and flavor properties for food packaging. The material has a unique structure with spindle-shaped domains dispersed in a matrix made of polypropylene. The domains are made of a polypropylene-based elastomer with specific size and aspect ratio. This structure provides improved drop impact resistance, blocking resistance, slipperiness, and flavor compared to conventional polypropylene packaging. It allows the material to have both drop impact resistance and slipperiness at low temperatures, which is challenging with conventional polypropylene. The laminate has a surface layer made of this specialized polypropylene material for applications like food trays and cups.

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High rigidity, high heat resistance polypropylene material with simple preparation and low cost. The material contains 27-53 wt% inorganic filler, 0-2 wt% nucleating agent, 0.1-1 wt% antioxidant, 0.05-1.5 wt% UV absorber, and 0.5-1.5 wt% lubricant. The material can be prepared by mixing the resins, filler, additives, and cycloolefin copolymer in a twin screw extruder. The cycloolefin copolymer provides higher modulus and temperature resistance. The material has improved modulus, strength, and heat resistance compared to conventional polypropylene.

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A heterophasic propylene copolymer with optimized toughness and good optical properties for thin-walled packaging applications. The copolymer is made by polymerizing propylene with comonomers like ethylene using a specific catalyst containing a non-phthalic internal donor. The resulting copolymer has a matrix phase and dispersed elastic phase. The matrix is a random propylene copolymer and the elastic phase is a propylene copolymer. The copolymer has balanced mechanical properties like toughness and optical properties like haze. It is useful in thin-walled containers and packaging where both properties are important.

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High-permeability and high-strength packaging material with improved properties like drop resistance for toy packaging. The material is made by mixing specific ratios of polymers like polyethylene, polyoctene elastomer, ethylene-butene copolymer, and additives like antioxidant. The composite material has enhanced strength and permeability compared to traditional polypropylene for toy packaging applications. The improved properties are achieved by the specific polymer blend. The material is prepared by melt-injection molding the blended polymers.

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Polypropylene-based resin composition for packaging bags used in retort packaging of food products, that provides both high low-temperature impact resistance and good heat sealability. The composition contains 85-95% of a propylene/ethylene block copolymer and 5-15% of an ethylene/α-olefin copolymer. The block copolymer has specific composition and molecular structure requirements. The ethylene/α-olefin copolymer has a low melt flow rate, high density, and melting peak temperature range. The composition achieves both high low-temp impact resistance and good heat sealability for enlarged packaging bags without sacrificing one for the other.

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A soft polypropylene composition with low n-hexane extractables for injection molded articles like tubes for food, cosmetic, and pharmaceutical packaging. The composition has a specific blend of a propylene homopolymer matrix and a high molecular weight propylene-based thermoplastic elastomer. This two-phase structure provides the desired balance of processability, softness, transparency, and low n-hexane extractables. The composition can contain additives like antiblocking agents, slip agents, antioxidants, acid scavengers, and antistatics.

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Ultra-lightweight food containers made of polypropylene that can be used for packaging refrigerated or frozen food products. The containers have significantly reduced wall thicknesses compared to conventional containers, resulting in lower weight. The use of polypropylene with specific properties allows for the thin walls without compromising impact resistance. The polypropylene has 15-25 mol% polyethylene and a melt index of 30-50 g/10 min. The wall thicknesses are 0.016-0.022 inches for the bowl sidewall and 0.014-0.020 inches for the lid central portion. These thin walls provide reduced weight containers that maintain impact resistance at refrigeration and frozen temperatures.

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