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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Laminated film for packaging applications that can maintain high gloss when molded at low temperatures. The film has an outer layer containing a propylene polymer with melting point 132-146°C. This allows low temperature sealing without gloss loss. The film can further have an easy-peel layer, buffer layer, pinhole-resistant layer, and oxygen barrier layer. The film is used to make packages by sealing it with a low temperature molded bottom material. This prevents gloss reduction when packaging heat sensitive items.

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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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Polyolefin-based resin sealant film for multilayer packaging with improved tear resistance and ease of opening. The film is made from a polyolefin composition containing propylene-α-olefin random copolymer. This copolymer lowers sealing temperature compared to pure propylene homopolymer. The film is used in multilayer packaging with base materials like nylon. The orientation angles of the base materials are different from the film's long axis. This reduces parting and allows parallel tearing. The film's composition enables easier opening and reduces breakage compared to using pure propylene homopolymer.

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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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Non-stretched film for food packaging bags with reduced seal strength degradation over time. The film has three layers: a surface layer and an intermediate layer made of propylene resin, and a sealing layer with specific composition. The sealing layer contains 20-80% propylene elastomer, 18-78% propylene random copolymer, and 2-20% linear low-density polyethylene. This composition suppresses changes in seal strength compared to traditional propylene-based films. The intermediate layer optionally contains propylene-ethylene block copolymer to prevent tearing during bag making.

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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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Laminate for packaging materials that has excellent recyclability, bag-making suitability, and pressure resistance, using a sealant made of a polypropylene material with a melting point difference of 15°C or more compared to the base film. This allows sealing the base film made of the same polypropylene material without deterioration. The sealant melting point is 130-160°C. The laminate can have an intermediate layer, barrier, or both.

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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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Laminate for packaging materials that has improved heat sealability and wider temperature range compared to traditional laminates made of different resin materials. The laminate comprises a stretched base material containing polypropylene and a sealant layer also containing polypropylene. The melting point of the polypropylene in the base material is higher than the polypropylene in the sealant layer. This allows heat sealing at lower temperatures without shrinkage. The laminate also has a barrier coating and optionally an adhesive layer between components.

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