Cast Polypropylene in Flexible Packaging

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-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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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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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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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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