Oriented Polypropylene for High-Strength Packaging

Biaxially oriented polypropylene film with excellent rigidity and heat resistance for packaging applications. The film has specific properties like high stress in both directions (5% elongation at 23°C), low heat shrinkage at high temperatures, and reduced wrinkles after sealing. The film is made by stretching in the width direction, heating to a temperature between Tm-10°C and Tm+10°C, and then stretching in the length direction. This processing sequence allows the crystals to orient without fully melting. The film composition includes a polypropylene homopolymer with a narrow molecular weight distribution, controlled crystallinity, and low melt flow rate. The film can have a multi-layer structure with an intermediate layer.

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Co-extruded multi-layer polymeric films for packaging applications that provide improved barrier properties, toughness, and snapability compared to existing films. The films have stacked layers of polypropylene with nucleating agents in each layer. The stack structure disrupts oxygen transport through the film. The films can be used to make containers for food packaging that offer similar barrier properties to more complex and less recyclable materials like EVOH and PVDC. The co-extruded films can be made on existing equipment and have recyclable materials like polypropylene. The films have weight percentages of EVOH copolymer and thicknesses within specified ranges. The films can also have layers of REBA material for added barrier and toughness.

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Biaxially oriented polypropylene film with improved rigidity and heat resistance. The film has specific elongation and shrinkage properties when heated to 150°C. The elongation in the length direction is 1.5 mm or less and the width direction is 0.1 mm or less. The thermal shrinkage rate in the length direction is 10% or less and in the width direction is 30% or less. This allows the film to maintain shape when made into bags and have fewer wrinkles after sealing compared to conventional films. The film has a polypropylene resin with specific molecular weight and low molecular weight content ranges.

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Packaging film, material, and food packaging with improved thermal stability and tear resistance after high-temperature retort processing. The packaging uses a specific composition and structure for the biaxially oriented polypropylene (BOPP) film. It contains a BOPP layer with high isotacticity (mmmm fraction) homopolypropylene and low crystallinity. This provides better thermal stability after retorting. Additionally, the BOPP layer has a lower internal haze compared to conventional BOPP, which improves tear resistance.

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Packaging film, material, and food packaging bodies that have improved balance between thermal dimensional stability and bag breakage resistance after high-retort treatment for monomaterial packaging of retort food. The film has a biaxially oriented propylene-based layer and a surface layer. The surface layer has properties like haze, roughness, and adhesive compatibility that balance with the film's dimensional stability and tear resistance after high-temperature processing.

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A polyolefin film for packaging with improved properties like transparency, sealability, tear resistance, and easy opening compared to conventional films. The film is made of a specific composition of propylene-α olefin random copolymer, ethylene-propylene block copolymer, and propylene homopolymer. The film has controlled heat shrinkage and plane orientation to match base films like nylon. It allows producing transparent laminates with improved straight cutting, tear strength, and opening ease compared to conventional films.

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Biaxially oriented polypropylene film with excellent rigidity and heat resistance for packaging applications. The film has high rigidity, reduced wrinkling during heat sealing, and low thermal shrinkage. The film is made by a specific stretching process where the film is first stretched in the width direction and then heat treated at a temperature lower than the stretching temperature. This alignment process creates high density crystals that resist melting and relaxation even at elevated temperatures. The resulting film has improved rigidity, wrinkle resistance, and heat sealing properties compared to conventional biaxially oriented polypropylene films.

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Packaging laminate and bags made from a monomaterial composite of mostly polypropylene that reduces deformation during heat sealing and prevents curling during retort processing. The laminate has a base layer with a stretched polypropylene film and a sealant layer with a polypropylene film. The films are aligned in the same direction. The heat shrinkage of the base layer films is controlled to be low in the sealing direction and the TD direction. This prevents deformation during sealing and reduces curling during retort processing compared to conventional PP laminates.

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Polyolefin resin film for packaging applications that has excellent transparency, sealability, bag forming properties, and tear resistance. The film is made from a specific composition of propylene-α olefin random copolymer, ethylene-butene copolymer elastomer, and propylene-butene copolymer elastomer. The film has controlled thermal shrinkage and orientation properties when laminated with highly strained films like biaxially oriented polyamide. This allows easy tearing without unintended separation while maintaining sealing and bag properties.

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Polypropylene-based unstretched film with balanced heat resistance and low-temperature sealability for use in packaging materials. The film has a composition with specific ratios of propylene homopolymer and propylene/ethylene random copolymer. It also optionally contains a thermoplastic elastomer. The film structure can have multiple layers. This balanced property profile allows using the film as a sealant in packaging applications like retort processing without compromising low-temperature sealing performance. The film can be used in packaging materials like mono-material packages made of polypropylene.

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A thin, high-pinhole-resistance polypropylene film for packaging applications that provides good balance between thinness and pinhole resistance. The film has a base layer made of homopolypropylene with an isotactic index of 96% or more, a thin surface layer containing 80% or more of homopolypropylene with an isotactic index of 98% or more, and a seal layer containing a propylene random copolymer with a total thickness of 25 μm or less. The thinness improves thinness while the specifications of the layers improve pinhole resistance. The seal layer has a tensile strength of 100 MPa or more in the flow direction of the resin. The film also has a heat seal strength of 5.0 N/15 mm or more at 130°C.

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A puncture-resistant BOPP film structure for packaging applications that provides improved strength, puncture resistance, and sealing properties compared to conventional BOPP films. The structure consists of an anti-adhesion layer, a core layer, a first adhesive layer, and a puncture-resistant layer that are co-extruded in sequence. The thicknesses of the layers are optimized to balance strength, sealing, and adhesion properties. The anti-adhesion layer prevents sticking during processing, the core layer provides strength, the first adhesive layer bonds to other films, and the puncture-resistant layer adds puncture resistance. The total film thickness is 18-28um with the anti-adhesion layer at 5-10% of the total, the core layer at 75-80%, and the puncture-resistant layer at 10

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Polyolefin-based resin film for packaging bags that provides improved straight cut and tear resistance when laminated with other films, like nylon or aluminum. The polyolefin film has specific compositions and orientations. It contains high levels of propylene-ethylene block copolymer, low levels of propylene-α olefin random copolymer, and linear low-density polyethylene with a narrow melting point range. The film is biaxially oriented with specific haze, puncture strength, static friction, and tear properties. The oriented polyolefin film can be laminated with other films to make packaging bags that have improved straight cut properties, tear resistance, and drop impact resistance compared to conventional laminates.

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Biaxially oriented polypropylene-based laminated film for packaging foods like sandwiches. The film has a polypropylene substrate layer and a polypropylene surface layer. The key properties are: 1. Substrate layer: Melting point peak temperature of 160°C or higher, propylene/α-olefin ratio of 0.2 mol% or less, and propylene content of 95% or more. 2. Surface layer: Propylene content of 95% or more and thickness of 60 μm or less, with a 3% to 12% thickness ratio of the surface layer to the overall film. 3. Optional intermediate layer between the substrate and surface layers. The film provides rigidity, anti-fogging, transparency, and cut-seal properties for food

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Biaxially oriented polypropylene film with high stiffness, heat resistance, and water vapor barrier properties suitable for packaging applications. The film is made from a polypropylene resin with specific properties. The film is formed by stretching in the width direction at a high temperature, followed by stretching in the longitudinal direction. This sequence allows high orientation and stiffness without shrinkage. The film has low heat shrinkage at high temperatures due to crystal alignment and restrained amorphous chains. The film has fewer wrinkles when heat sealed due to reduced entanglement and chain distortion.

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A polyolefin film for packaging that has improved drop resistance and tearability compared to conventional polyolefin films. The film contains a specific blend of polyolefin resins, including propylene-ethylene block copolymers, propylene-α-olefin random copolymers, and ethylene-propylene copolymer elastomers. This composition provides excellent drop resistance, tear strength, and straight cuttability for packaging bags. The film is also biaxially stretched with controlled heat shrinkage and yield stress to match the properties of biaxially stretched polyamide films. The film can be laminated with other films like polyamide, polyester, or polypropylene for packaging applications like retort pouches. The laminate has low bag breakage when dropped and improved tearability compared to single polyolefin films.

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Laminate for packaging materials and a package with improved drop resistance at low temperatures by using an impact-resistant sealant layer made of a polyolefin material with specific properties. The laminate has at least a substrate layer made of oriented polypropylene and a sealant layer made of a polyolefin material with an elastic modulus of 100 to 500 MPa and film elongation of 500 to 900%. This sealant layer reduces bag breakage when dropped, especially at low temperatures. The laminate can also have an intermediate layer and a barrier film. The sealant layer density is 0.91 to 0.95 g/cm3. The polyolefin sealant may be linear low-density polyethylene. The package is formed by heat-sealing the laminate edges.

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Food packaging film that provides good water vapor barrier properties without needing a separate CPP film. The film has a biaxially oriented OPP layer made from a propylene polymer composition with a tackifier. A thin heat seal layer is added directly to one surface. The tackifier improves the OPP's water vapor barrier. The heat seal layer is the outermost layer. The overall thickness is 0.1-10 μm. The film is used for packaging dry foods with low water activity. The OPP layer contains 100% tackifier by mass. The heat seal layer can be biaxially oriented OPP or copolymers. The OPP layer thickness is 50-99.8% of the total. The film structure eliminates the need for a separate CPP film for heat sealing.

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Biaxially oriented polypropylene film with high rigidity and heat resistance suitable for packaging applications. The film has a polypropylene composition with specific molecular weight distribution, melt flow rate, and crystallinity. The film is made by biaxial stretching the polypropylene in both directions. The stretching sequence can be longitudinal then width, or width then longitudinal. The resulting film has high elongation at break in both directions and low shrinkage at high temperatures. This provides excellent rigidity and reduces wrinkling when heat sealed.

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Biaxially oriented polypropylene film that has excellent rigidity and heat resistance for packaging applications. The film is made by biaxially orienting a polypropylene resin composition with specific properties. The film has a 3-layer structure with a substrate, intermediate, and surface layer. The film has a longitudinal elongation stress of 40 MPa or more at 5% elongation and a width direction stress of 160 MPa or more at 5% elongation at 23°C. The film also has low heat shrinkage rates of 10% or less in the longitudinal direction and 30% or less in the width direction at 150°C. The film maintains shape well when made into bags, has fewer wrinkles when heat sealed, and has improved lamination strength compared to conventional biaxially

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