Breakthroughs in C-PET for High-Performance Packaging

Clear, rigid medical packaging that can be sterilized by autoclave steam without warping or shrinking. The packaging is made by extruding a crystalline thermoplastic like PET, then partially stretching the film, heating it, and thermoforming it into the final shape. This process limits crystal growth to small spherulites rather than large crystals that cause warpage. The film is then sealed around the device and steam sterilized. The spherulitic crystals provide clarity and strength, but the restricted crystal growth prevents warping during sterilization. The packaging can be made by coextruding layers of different thicknesses that are split and stacked by multiplier units to form the final multilayer structure.

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Stretched multilayer film for packaging with improved mechanical strength, heat resistance, and barrier properties. The film has alternating layers of PBT (polybutylene terephthalate) and PET (polyethylene terephthalate) without an adhesive layer. The PBT and PET layers have reduced copolymer contents to maintain compatibility and avoid curling during stretching. The film can be produced by coextruding PBT and PET layers and then stretching them using a tenter system. This allows the film to have both the toughness of PBT and the heat resistance of PET.

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A packaging bag made from a multilayer film that provides excellent heat resistance, mechanical strength, and impact resistance for microwave food heating. The bag uses a specific multilayer film structure with an innermost layer of biaxially stretched PET that is partially crystallized by laser irradiation to form heat seals. This allows heat sealing of the PET layer without impairing its orientation and properties. The bag also has an outermost layer of biaxially stretched PET with an amorphized or low-crystallized portion formed by laser irradiation. This creates a brittle easy-opening section that matches the slit in the middle layer, enabling easy tearing of the entire multilayer film when opened.

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Laminate, packaging, and packaged articles with improved strength, heat resistance, recyclability, and puncture resistance compared to existing packaging materials. The laminate has a base layer, adhesive layer, and sealant layer, where the base and sealant layers contain polyethylene. The base layer has a crystallinity of 35% or higher, measured by X-ray diffraction. This high crystallinity provides strength and heat resistance. The laminate can also have an intermediate layer between the base and sealant. The adhesive layer can have gas barrier properties. The laminate can further have a protective layer facing the sealant. The laminate can have a metal vapor-deposited layer between the base and sealant. The laminate can also have a gas barrier layer between the base and sealant. The laminate can have a white sealant. The l

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Gas barrier film for packaging that reduces environmental impact and improves barrier properties compared to traditional films. The film contains chemically recycled polyester with specific intrinsic viscosity and melting point ranges. It also has a thin inorganic coating. The chemically recycled polyester allows using recycled material with lower environmental impact. The viscosity range prevents excessive stretching forces during film production that can cause breaks. The higher melting point improves heat resistance. The thin inorganic coating further improves barrier properties.

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Polyester film for heat shrinkable labels and packaging that has controlled crystallinity for improved thermal and chemical resistance. The film contains a copolymerized polyester resin with three or more diols and a dicarboxylic acid. The film has a difference in heat capacity of 0.25 J/g·K or more before and after the glass transition temperature, measured by DSC. This controlled crystallinity balances thermal and chemical properties.

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Multilayer film for packaging materials like food and medicine containers that has good sealing and easy opening properties when used with high heat resistant containers like C-PET. The film has a sealing layer and surface layer. The film composition is characterized by having at least 70% total polyester resin, at least 10% crystalline polyester resin, and at least 20% amorphous polyester resin. Additionally, the film has at least 1% polyolefin resin. This composition provides good sealing strength, heat resistance, and avoids film residue after peeling.

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Biaxially oriented polyester film with improved properties for packaging applications. The film contains chemically recycled polyester with specific intrinsic viscosity and melting point ranges. This allows using more recycled material while preventing film breakage during manufacturing and maintaining mechanical strength and heat resistance. The film can be used in laminates and packaging containers.

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Gas barrier films, laminates, and packaging containers with improved gas barrier properties and reduced environmental impact. The gas barrier films contain chemically recycled polyesters with specific intrinsic viscosities to balance film strength and gas barrier properties. The chemically recycled polyesters are derived from post-consumer recycled PET bottles. The films have melting points above 251°C for heat resistance. The films can further include coatings, protective layers, and inorganic thin film layers. The laminates and packaging containers use these films with sealant and adhesive layers.

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Multilayer film for packaging materials like food and medicine that balances sealing strength, heat resistance, and easy opening when used in high temperature containers like crystallized PET. The film has a sealing layer and surface layer with specific resin ratios. The total polyester resin is 70% or more, with at least 10% crystalline polyester and 20% amorphous polyester. The film also has 1% or more polyolefin resin. This composition provides good appearance after peeling, transparency, and processability while avoiding residue.

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A polyester film for heat shrinkable labels and packaging materials that can be recycled due to controlled crystallinity. The film has a polyester resin with a specific copolymer composition, crystallization temperature, and melting temperature difference. The film has a controlled crystallinity range that improves thermal and chemical properties. The controlled crystallinity allows recyclability without degradation while maintaining shrinkage uniformity and sealing.

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Heat-sealable packaging film made by extrusion coating a crystalline polyester layer onto a base film. The crystalline polyester layer allows higher recycling temperatures without sticking compared to amorphous layers. The crystalline polyester can be an isophthalic acid modified copolyester. The base film and extrusion coated layers have thicknesses and grammages in specific ranges. This film structure allows recycling without agglomeration and enables recycling of objects sealed with the film.

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A packaging process using heat-shrinkable films made from a specific type of semi-crystalline thermoplastic polyester. The polyester has a molar ratio of 1,4:3,6-dianhydrohexitol units to total diol units of 0.05 to 0.30. The films have improved properties like higher heat resistance and better mechanical strength compared to regular PET films. The process involves extruding the polyester into thin films, then stretching and cooling them to form heat-shrinkable films. These films are used for packaging products like food items. The films closely conform to the product shape when heated, then harden on cooling. The films provide better impact resistance and thermal resistance compared to regular PET films. The polyester composition allows the films to have higher glass transition temperatures.

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Method of producing polyester packaging with increased heat resistance for pouring hot food products and/or for sterilisation. The method involves extruding and thermoforming foamed polyester films made from recycled PET containing up to 6% polyolefin. The recycled PET is dried and foamed with inert gas in the extruder. The foamed film is then shaped into containers by thermoforming. The foaming and thermoforming converts amorphous PET to partially crystalline CPET, increasing the heat resistance above 80-100°C for hot filling and sterilization applications.

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Heat shrinkable packaging films made from semi-crystalline thermoplastic polyesters containing 1,4:3,6-dianhydrohexitol units like isosorbide. The polyesters have specific composition ratios of the dianhydrohexitol, cycloaliphatic diol, and terephthalic acid units. The films have improved properties like heat resistance and mechanical strength compared to traditional polyesters. The films are prepared by extrusion and stretching, then used to package products. The packaging involves coating the product with the heat shrinkable film, followed by heat treatment to shrink the film around the product. The polyesters have melting points in the range of 210-295°C.

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Polyester film with controlled crystallinity for heat shrinkable labels and packaging materials. The film has a polyester resin with a specific heat capacity difference (ΔCp) of 0.25 J/g·K or more when scanned using DSC. This controlled crystallinity provides both good thermal properties for heat shrinking and chemical resistance. The film is made by copolymerizing diols and dicarboxylic acids, melting and casting, then preheating, stretching, and heat setting. The ΔCp value ensures the film has suitable thermal properties for heat shrinking and chemical resistance for container sealing.

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Vacuum skin food packaging film for oven cooking that can withstand high temperatures up to 220°C. The packaging film has a sealing layer made of polyester with a melting point above 200°C and a glass transition temperature above 60°C. This allows the film to seal and withstand oven heating without collapsing. The high temperature polyester sealing layer enables ovenable vacuum skin packaging without using adhesives or coatings on the packaging film.

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Stretched multilayer film for packaging applications with excellent mechanical strength, heat resistance, and barrier properties. The film has layers of polybutylene terephthalate (PBT) and polyethylene terephthalate (PET) that are coextruded and stretched together without intermediate adhesive layers. The PBT and PET layers have controlled copolymerization contents below 8 mol% and 5 mol%, respectively, to maintain crystallinity and properties during stretching. This allows the film to have high piercing strength, heat resistance, and barrier properties without needing multiple lamination steps. The film can be further laminated with other functional layers. The coextruded multilayer film is then biaxially stretched to form the final stretched multilayer film.

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Stretched multilayer film with improved mechanical strength and heat resistance, and a packaging bag made from it. The film has layers of PET and PBT without an adhesive between them. The total copolymerization component content in the PBT is 8 mol% or less and in the PET is 5 mol% or less. This allows both PET's heat resistance and PBT's strength to be exhibited in the film. The film is produced by coextruding and laminating PET and PBT without an interlayer adhesive, then stretching it. This provides the film with high puncture strength and good stretchability without curling. The film can be used for packaging applications where both heat resistance and mechanical strength are required.

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Stretched multilayer film with improved mechanical strength and heat resistance compared to conventional multilayer films. The film has layers of polybutylene terephthalate (PBT) and polyethylene terephthalate (PET) that are laminated without an adhesive layer. The PBT and PET layers have reduced copolymerization component contents of 8 mol% and 5 mol%, respectively, to optimize crystallization and balance during stretching. This prevents curl and allows the film to have high piercing strength and heat resistance. The PET and PBT layers are arranged symmetrically in thickness to further balance stretch. The film can be made by coextrusion followed by stretching.

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