Emerging Technologies in Copolymer PET Manufacturing

Laminate with improved adhesion properties when used with substrates containing antistatic agents. The laminate has three layers: a barrier layer, a resin layer, and a substrate layer. The resin layer contains a specific copolymer with ethylene and a dicarboxylic anhydride monomer. This copolymer provides good adhesion to the barrier layer and substrate layer even when the substrate contains an antistatic agent. The barrier layer has low oxygen permeability. The laminate can be used in packaging applications where the substrate contains antistatic agents.

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Polyester resin composition for films with improved barrier properties and mechanical strength compared to traditional polyethylene terephthalate (PET) resins. The composition contains a furandicarboxylic acid-based polyester resin (A) and a thermoplastic elastomer (B) containing isophthalic acid, tetramethylene glycol, and butadiene units. The thermoplastic elastomer has specific storage modulus and loss tangent properties at low temperatures. The composition provides balance between barrier properties and mechanical strength for films used in packaging applications.

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Packaging blends for clear PET bottles that can be recycled into clear PET without degrading quality. The blends contain a polyester like PET and a second polymer that forms a separate glass transition temperature. This prevents the second polymer from interfering with PET recycling. The blends can have high haze or opacity for opaque packaging. To recycle, the blends are treated to reduce opacity and transesterify the second polymer into the PET. This converts back to clear PET for recycling.

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A biomass-derived polymer for making lightweight, porous materials like sheets and bottles with improved properties for applications like display screens and packaging. The polymer is a biomass-derived 4-methyl-1-pentene polymer that is blended with a polyester resin. The polymer has a specific composition with 30-100 mol % 4-methyl-1-pentene units derived from biomass and 0-70 mol % units from other α-olefins. The blended resin can be processed into porous sheets or bottles with voids by stretching or blow molding. The biomass-derived polymer provides mechanical strength, light scattering, and biodegradability compared to fossil-based polymers.

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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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Gas barrier films, laminates, and packaging containers with improved gas barrier properties, reduced yellowing, and reduced film breakage during manufacturing. The films contain chemically recycled polyester with a specific low molecular weight composition. The chemically recycled polyester has an area ratio of 1.9-5.5% for components with molecular weight 1000 or less in the biaxially oriented film. This balances low molecular weight components for gas barrier properties against reducing yellowing and film strength issues. The films can also have coatings, protective layers, and compositions with oxazoline or urethane groups to further enhance adhesion and barrier performance. The compositions can be used in laminates and containers with improved sealing and barrier properties.

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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-shrinkable polyester film for labels and packaging that has improved puncture strength, puncture strength when used as a label on PET bottles, and bag drop properties. The film contains 60-95 mol% ethylene terephthalate, 5-40 mol% diethylene glycol, and no more than 5 mol% amorphous-forming units. It has specific hot water shrinkage, density, refractive index, and haze values. The film provides good puncture resistance when stretched, prevents label tearing on PET bottles, and reduces bagging when dropped.

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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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Heat-shrinkable polyester films suitable for recycling into PET bottles without degrading the bottle quality. The films have specific shrinkage properties and chemical composition to match the raw materials used in PET bottle production. This allows recycling the films along with PET bottles without issues like loss of clarity or poor mechanical properties. The films have thermal shrinkage rates in water and melting characteristics similar to PET bottle resin. The composition contains high levels of ethylene terephthalate ester units and dicarboxylic acid comonomers like isophthalic acid. This matches the PET bottle resin composition. The films also have haze and density ranges to avoid issues like pulsing during extrusion.

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Food packaging material replacement for styrene-containing materials like HIPS and PVdC. The replacement is a formable sheet and packaging structure made by co-extrusion of specific materials like post-consumer recycled PET (PCR PET), polypropylene (PP), ethylene methyl acrylate (EMA), ethylene/methyl acrylate/glycidyl methacrylate terpolymer (EMA-GMA), and blue-white TiO2 color concentrate. The structure has improved oxygen and moisture barrier, trim force, seal/peel force, hot fill resistance, and impact resistance compared to standard PET. It replaces HIPS/PVdC in ambient fill applications without compromising packaging performance.

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Copolyester resin for heat shrinkable films with reduced thickness that can be used for heat shrinkable labels on containers. The copolyester has specific compositions to balance properties like shrinkage, strength, and processing. It contains 5-40 mol% diethylene glycol units in the copolymer. This allows higher shrinkage compared to standard PET, but with lower diethylene glycol contents to avoid foreign substance formation. The copolyester has controlled intrinsic viscosity, melt viscosity, and resin temperature to balance shrinkage, thickness uniformity, and processing ease.

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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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PET barrier bottles that contain recycled PET and have improved barrier properties against oxygen and carbon dioxide compared to regular PET bottles. The key innovation is adding a specific amount of aliphatic furanoate polymer to the recycled PET during bottle production. The aliphatic furanoate copolymerizes with the PET, reducing yellowing and opacity compared to recycled PET alone. The aliphatic furanoate also improves the oxygen and carbon dioxide barrier of the PET. The amount of aliphatic furanoate is between 4-40 wt% based on the total weight of the bottle.

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Packaging bag design to prevent delamination and failure at fold lines. The bag has a folded upper front section. The inner layer at the fold is made of softened polyethylene terephthalate (PET) containing isophthalic acid. This reduces external force on the fold and prevents delamination compared to harder PET. The softened PET also helps protect adjacent layers from puncture. The softened PET layer can have 0.5-5 mol% isophthalic acid.

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Packaging container with improved impact resistance and weld strength compared to containers made solely from polyester or polyamide resins. The container has a molded article made from a resin composition containing a modified polyester resin, polyethylene, and an epoxy-containing compatibilizer. The molded article is joined to a torso with a layer of the same modified polyester resin. The modified polyester resin is a polyethylene terephthalate with dialkyl substitution. The sea-island structure of polyester and polyethylene in the molded article provides strength and impact resistance. The modified polyester layer on the torso improves weld strength.

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Resin composition, molded articles, laminated films, and packaging containers with improved impact resistance and welding strength. The composition contains a polyester resin, a polyethylene resin, and a compatibilizer with an epoxy group. The polyester resin is modified with a dialkyl-substituted diol. This composition can be used to make molded products, laminated films, and packaging containers with improved impact resistance and welding strength compared to using just polyester resin. The sea-island structure of polyethylene islands in a polyester matrix further improves impact resistance.

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Polyester film for heat shrink labels and packaging that reduces defects like wrinkling during the heat shrinking process. The film has controlled shrinkage uniformity by carefully selecting the polyester resin components. The film is made by polymerizing aromatic dicarboxylic acids with a copolymer of ethylene glycol and other comonomers. The resulting polyester resin has specific temperature-shrinkage properties that prevent rapid contraction during heat shrinking and avoids non-uniform appearance or wrinkles.

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Polyester film for heat-shrinkable labels and packaging materials that reduces wrinkling and non-uniform shrinkage during the heat shrinking process. The film contains a copolymerized polyester resin made from aromatic dicarboxylic acids and a diol containing ethylene glycol and additional comonomers. The film has specific shrinkage properties at different temperatures, such as T75-70 being 1-3%/°C, T90-80 being 2-3%/°C, and T100-90 being 0-2%/°C. This improves uniformity during heat shrinking compared to traditional polyester films.

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Refillable carbonated soft drink bottles that improve caustic stress cracking resistance (CSCR) by improving the physical properties of the bottles. The bottles incorporate diacid and/or diol co-units (co-monomers) that form co-polyester resins that acceptably limit crystallization, in combination with incorporating a sufficiently low-stress petaloid base design in the bottle, a surprising improvement in the CSCR performance is attained.

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