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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Food packaging film with reduced thickness unevenness and improved water vapor barrier properties. The film has a biaxially oriented propylene-based polymer layer with specific moduli in the machine (MD) and transverse (TD) directions. The MD modulus is 1500-3000 MPa and the TD modulus is 6600-7500 MPa. This balance suppresses thickness variation while enhancing water vapor barrier.

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A polyolefin-based resin film for use in packaging bags that provides improved tear strength, straight cut properties, and drop resistance compared to conventional films. The film is made by stretching a polypropylene composition containing block copolymers, random copolymers, and elastomers. The stretching orientation reduces shrinkage and maintains molecular chain alignment within limits. This allows better tearability, straight cutting, and drop impact resistance when laminated with base films like nylon or polyester. The film composition has 40-97% block/random copolymers, 0-50% homopolymer, and 3-10% elastomers.

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Biaxially oriented polypropylene film with improved rigidity and heat resistance. The film has a specific polypropylene resin composition and film formation process. The polypropylene resin has a narrow molecular weight distribution and a high melting point. The film is oriented by stretching in the width direction followed by heat treatment. This gives the film high rigidity and low shrinkage at high temperatures. The film is suitable for packaging bags as it maintains shape and has few wrinkles after sealing.

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Biaxially oriented polypropylene film with high rigidity and fusing, heat sealing, and bag-making properties suitable for packaging sandwiches and other foods. The film has a base layer made of a polypropylene composition with specific characteristics, like a melting point of 160°C or higher and low alpha olefin content, and a surface layer made of a polypropylene composition. The base layer also contains a small amount of polyethylene. This film has high rigidity, fogging resistance, and sealing properties for fusing and heat sealing.

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Recyclable packaging pouch for foods that can withstand microwave heating and has improved low temperature impact resistance. The pouch is made by laminating a base film of stretched polypropylene with a heat seal film. The heat seal film is a propylene-based film with specific properties. It has a loss tangent of >0.0594 at 5°C and an elastic ratio >1 MPa. The propylene-based film contains an impact polypropylene with dispersed ethylene/propylene copolymer and <20% linear low-density polyethylene. The base film is a cast polypropylene with >8% xylene-soluble ethylene/propylene copolymer. The pouch structure allows microwaving while avoiding seal failure and peeling.

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Co-extruded multilayer polymeric film with enhanced barrier properties, stiffness, and snapability for packaging applications. The film has a stack of polypropylene layers with alternate layers having different microstructures to disrupt oxygen transport. This structure is achieved by co-extruding layers A and Bl, where A is predominantly polypropylene and Bl has 50% or less of a hydrocarbon resin. The alternate layers with different crystallinities form an interface to hinder oxygen diffusion. The film can also have additional layers like EVOH for higher barrier. The stacked PP layers provide rigidity, while the alternate crystallinities enhance barrier performance.

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Biaxially oriented polypropylene film with high rigidity and heat resistance suitable for packaging bags. The film has low thermal shrinkage at 150°C in both directions, high width direction elongation at 23°C, and a specific relationship between width direction elongation and thermal shrinkage. The film is made by orienting a polypropylene resin composition, then reorienting in the width direction at a high temperature above the melting point. This allows high rigidity and low shrinkage without impairing moisture barrier properties.

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Biaxially oriented polypropylene film with high rigidity and heat resistance, suitable for packaging applications like bags. The film is made by orienting a polypropylene resin with specific properties. The resin has high stereoregularity and high crystallinity. It is blended with compounds like glycerin monostearate and stearylamine monostearate. The film is made by stretching the resin sheet biaxially in sequential steps, first widthwise and then lengthwise. This alignment of the polypropylene molecules creates a film with strong crystalline orientation, high crystallinity, and reduced chain entanglement. This allows the film to maintain rigidity and low shrinkage at high temperatures up to 150°C.

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Biaxially oriented polypropylene film with excellent rigidity and heat resistance for packaging applications. The film has specific properties like high stress at 5% elongation in both directions, low heat shrinkage at high temperatures, and low surface resistance. The film is made by stretching the polypropylene resin in two directions, with the initial stretch in the width direction. This alignment of the polypropylene molecules produces strong crystals and reduced entanglements for high rigidity and heat resistance. The film structure is a multi-layer composition of base, intermediate, and surface layers.

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Biaxially oriented polypropylene film for food packaging with improved barrier properties to oxygen and mineral oils. The film has a multilayer structure with a base layer of polypropylene, an outer adhesive layer of olefin copolymers, and an outer shell layer made of a blend of amorphous and semi-crystalline polyamides. The blend ratio of amorphous to semi-crystalline polyamide is 25-75% and 75-25%, respectively. This allows biaxial orientation of the polyamide shell without delamination or tearing. The film provides high barrier properties to oxygen and mineral oils for food packaging applications.

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Food packaging film with improved water vapor barrier and reduced thickness variation. The film has a stretched propylene-based polymer layer containing a tackifier, along with optional other additives. The total content of propylene polymer and tackifier is controlled to 7000-8500 MPa tensile modulus range. This balance improves the water vapor barrier and suppresses thickness unevenness compared to high modulus propylene alone. The film can be made by coextruding layers with propylene-based resins, surface layers, and heat seal layers.

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Food packaging film with improved water vapor barrier and reduced thickness unevenness. The film uses a propylene-based polymer composition for the stretched layer. It contains a first propylene polymer with 130-162°C melting point, a secondary propylene polymer with 180-180°C melting point, and a tackifier. The composition balance allows better water vapor barrier while minimizing thickness variations compared to using high-melting propylene polymers alone.

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A film for packaging applications that is less likely to break when dropped due to its bag shape and unique composition. The film contains a propylene polymer with at least 50% propylene units and an ethylene polymer with at least 50% ethylene units. The film also has specific weight ratios between the propylene and ethylene polymers. This composition gives the film high piercing breaking load and deformation resistance to prevent tearing when dropped. The film is produced by melt-kneading and extruding the polymer blend at high screw speeds.

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A polypropylene-based stretched film for packaging that reduces adhesion between bags after making. The film has a surface layer made of a copolymer with a transition temperature of 100°C or higher. The copolymer surface prevents pseudo-adhesion between bags when they come into contact after production. The base layer is propylene homopolymer and the middle seal layer faces the copolymer layer. The copolymer surface transition temperature prevents bonding when bags touch.

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A high rigidity, heat-resistant polypropylene film for 2-axis orientation that can be used as packaging material. The film has improved rigidity, heat resistance, and dimensional stability compared to conventional polypropylene films. It achieves this by using a specific polypropylene resin composition with tailored molecular weight distribution, tacticity, and crystallinity. The resin has a maximum melting point of 170°C, a degree of crystallinity of 40-60%, and a meso pentad percentage of 0.5-2 mol %. This resin composition allows the film to have high rigidity, low shrinkage, and good heat sealing properties.

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Biaxially oriented polypropylene film with excellent rigidity and heat resistance for packaging applications. The film is made by stretching a polypropylene composition in two directions, first widthwise then lengthwise. The polypropylene resin has high stereoregularity and crystallinity. This alignment of the molecules creates strong crystal orientation and a higher melting point. The film also has fewer wrinkles when heat sealed and less shrinkage at high temperatures compared to conventional polypropylene films.

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Polypropylene-based food packaging film with excellent adhesion to containers, oxygen blocking, shrinkage, and clarity. The film has an inner layer with a polypropylene terpolymer, a gas barrier layer of EVOH, PVDC, or nylon, and a top layer with the same polypropylene terpolymer. An adhesive layer between the barrier and inner layers can contain a modified polypropylene. The film is stretched after coextrusion to enhance properties.

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Food packaging film with improved water vapor barrier properties and reduced thickness variation compared to conventional OPP films. The film has a biaxially stretched inner layer made from a propylene-based polymer with a melting point of 130-162°C, and an outer layer made from a propylene-based polymer with a melting point of 180°C or less. This combination provides better water vapor barrier and thickness uniformity compared to using high melting point polypropylene alone. The inner layer improves barrier, while the outer layer reduces thickness variation.

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A biaxially oriented polypropylene film with improved heat seal strength and suitability for packaging heavy objects. The film has a base layer, an intermediate layer, and a sealing layer. The melting points of the base layer and sealing layer resins are in a specific range. The thicknesses of the intermediate and sealing layers are within certain ratios of the total film thickness. This allows the film to have sufficient heat seal strength and tightness for heavy object packaging, smoother transportation in automated packaging, reduced wrinkling, and less air reflow when degassed.

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Food packaging film with improved antistatic properties and sealability compared to traditional OPP films. The film contains a biaxially stretched layer with both propylene polymer and polyethylene. The polyethylene content is 0.5-25 wt% of the total polymer blend. This reduces intrinsic resistance and improves antistatic properties without adding excessive antistatic agents. The film also has balanced mechanical properties like heat sealability and shrinkage.

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Food packaging film with improved antistatic properties and balance of heat sealability compared to traditional OPP films. The film has a biaxially stretched polypropylene layer for water vapor barrier and transparency, sandwiched between a heat seal layer and a surface layer. The surface layer is made of a polyolefin resin composition containing homopolypropylene and polyethylene. Mixing polyethylene with polypropylene reduces surface resistance without adding more antistatic agent, improving antistatic properties.

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A polypropylene film with improved strength, crack resistance, and impact protection for packaging applications. The film has a multi-layer construction with reinforcing warp and weft yarns intersecting at the film layers. This provides enhanced pull resistance and overall strength to prevent cracks during packaging processes. The film also has buffer blocks with vertical grooves on the second layer to increase flexibility while still maintaining strength. This prevents film cracking when coated on boxes and protects the contents during transportation over uneven surfaces.

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Monoaxially oriented polyolefin films for packaging applications that have both low seal initiation temperatures and directional tear properties. The films contain a blend of propylene-based random copolymers, ethylene-propylene elastomers/plastomers, and low density polyethylene. The films are monoaxially oriented at 2.5-6 times in one direction to achieve thinness below 50 microns while maintaining linear tear properties. The incompatible LDPE in the copolymer blend during orientation forms ordered domains that facilitate linear tear parallel to the orientation direction.

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Easy-tear polypropylene packaging film manufacturing method that involves unidirectional orientation stretching of the film followed by quenching. The unidirectional orientation stretching rearranges the molecular chains to a more ordered arrangement, making the film easier to tear in that direction. Quenching the stretched film to a lower temperature stabilizes the ordered structure and prevents chain rebound. This results in a polypropylene film with predictable tear behavior that is easier to tear in one direction compared to conventional films.

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Biaxially stretched polypropylene film with improved hot tack and heat seal properties for packaging applications like fruit and vegetable bags. The film has three layers: a seal layer containing 75-93% propylene copolymer and polyethylene, a surface layer with 50-99% crystalline PP resins, and a base layer. The unique composition of the seal layer provides good hot tack and seal strength for filling containers without opening, while the surface layer protects the base layer during molding.

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