High Intrinsic Viscosity Polyethylene Terephthalate for Packaging

Lightweight, durable wine bottle made of polymer material like PET that is suitable for long-term storage of wine with natural cork stoppers. The bottle has a coating on the inside to prevent oxygen and volatile compound transfer. The polymer walls are thick enough to withstand corking and uncorking forces. The bottle dimensions and weight are optimized for compatibility with existing bottling lines and shipping. The lightweight design reduces weight by up to 50% compared to glass bottles.

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Recycling of polyethylene terephthalate (PET) bottles into high quality, food-grade PET pellets that can be used to make new bottles. The recycling process involves reprocessing the PET flakes from post-consumer bottles to increase molecular weight, intrinsic viscosity, and color quality. This is achieved through controlled extrusion and solid-state polymerization steps. Chain extenders and anti-yellowing agents are added during extrusion. The extruded pellets are then treated by solid-state polymerization to further improve molecular weight and color. The resulting recycled PET pellets have average molecular weight above 40,000 Da, intrinsic viscosity around 0.7-0.9 dl/g, and color deviation under 2.5.

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Biaxially oriented polyester film made from chemically recycled polyester that reduces environmental impact compared to virgin polyester. The chemically recycled polyester has specific molecular weight properties to prevent bubble formation during film production. It has a low percentage of low molecular weight components (<1000 Da) and a higher molecular weight compared to recycled polyester made from mechanical recycling. This prevents air entrainment and bubble formation during film extrusion. The chemically recycled polyester can be obtained by decomposing and repolymerizing the polyester from used bottles. The film properties like melting specific resistance, lamination strength, and heat shrinkage are similar to films made from virgin fossil fuel-based polyester.

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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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Biaxially oriented polyester films containing chemically recycled polyester with improved properties for packaging applications. The films have an intrinsic viscosity of 0.50 dl/g to 0.70 dl/g, melting point of 251°C or higher, and contain 0.1 mol% to 3.0 mol% of isophthalic acid. This composition reduces film breakage during stretching, improves mechanical properties, and maintains heat resistance compared to using virgin polyester. The films can be made from chemically recycled polyester derived from decomposing and polymerizing used polyester products.

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Manufacturing method for recycled solid polymer particles with improved properties for recycling post-consumer PET waste. The method involves adding a specific type and size of porous carbon material to the PET during mixing, followed by dilution and solid-state polymerization steps. The carbon enhances the intrinsic viscosity of the recycled particles, making them more suitable for further processing and applications. The carbon material is 300-500 nm in size with 300 m2/g surface area.

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A process for producing high molecular weight polyesters containing 2,5-furandicarboxylate units that can be used in bottle, film, and fiber applications without discoloration. The process involves a three-step synthesis: (1) a transesterification step to convert 2,5-furandicarboxylic acid to a prepolymer ester, (2) a catalyzed polycondensation step to polymerize the prepolymer, and (3) a solid-state polymerization step to crystallize and dry the polymer pellets. The process uses specific catalysts and conditions to avoid color formation during polymerization. The resulting polyesters have high molecular weight and can be processed into clear bottles, films, and fibers.

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Manufacturing recycled PET pellets using waste PET bottles that suppresses hydrolysis due to moisture in the regeneration process and has a high intrinsic viscosity (IV) of 0.72 to 0.8 dl/g. The manufacturing method includes selecting from the collected waste PET bottles and pulverized in a play form only for transparent waste PET bottles, crystallized and dried, then solid-state polymerization and solid-state polymerization.

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A process to produce polyester polymers containing 2,5-furandicarboxylic acid (FDCA) for use in bottles, films, and fibers without discoloration. The process involves making a prepolymer with FDCA, then melt-polymerizing it under reduced pressure to form the final polyester. This avoids the need for purification steps and produces bright white polymers. The melt-polymerization conditions are optimized to prevent discoloration. The resulting polymers have a number average molecular weight of 25,000 or more and can be used in applications like PET bottles, fibers, and films.

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High molecular weight, semi-crystalline biobased thermoplastics with glass transition temperatures (Tg) above 93°C suitable for hot fill packaging applications. The polymers are made by melt polymerization of bio-based monomers like isoidide, furandicarboxylic acid (FDCA), and butanediols. After melt polymerization, solid state post-condensation (SSPC) is performed at lower temperatures to increase molecular weight without degradation. This allows making high Tg, semi-crystalline biobased polyesters for hot fill packaging without needing vertical ribs or panels to expand/contract during heating.

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A process for making high molecular weight polyesters with 2,5-furandicarboxylate (FDCA) segments without discoloration. The process involves a three-step synthesis: 1) making a prepolymer by reacting FDCA with diols in the presence of a catalyst like calcium or zinc acetate, 2) polycondensation of the prepolymer at lower temperatures compared to conventional polyester synthesis, and 3) melt polymerization. This allows producing FDCA polyesters with high molecular weight and low color without purification steps. The resulting polyesters can be used for bottles, fibers, and films with improved properties compared to existing FDCA polyesters.

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High molecular weight polyesters containing 2,5-furandicarboxylic acid (FDCA) units that can be used for clear plastic bottles, fibers, and films without discoloration. The polyesters are prepared by a three-step process involving making a prepolymer with FDCA, followed by melt polycondensation under reduced pressure at elevated temperature using a catalyst. This avoids discoloration compared to direct polymerization of FDCA. The resulting polyesters have high molecular weight and low color compared to prior FDCA polymers.

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Method for producing polyester resins containing 2,5-furandicarboxylate (FDCA) groups that can be used in bottles, films, and textiles without discoloration. The method involves a three-step process: (1) transesterification of dimethyl FDCA with ethylene glycol using a catalyst to make a prepolymer, (2) melt polycondensation of the prepolymer at reduced pressure and elevated temperature using a catalyst, and (3) drying and crystallization of the polymer. The polymer has a molecular weight >25,000 and absorbs <0.05 at 400 nm, avoiding color issues compared to prior methods.

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Dual ovenable vacuum skin packaging using a specific polyester film for the top web. The film has three layers: an outer heat sealable layer, an inner polyester base layer with high intrinsic viscosity, and an outer polyester layer. This film allows vacuum skin packaging of food products like meat that can be cooked in the package without air pockets or self-sealing defects. The film conforms well to the product and seals tightly to the entire surface of the support. The high viscosity base layer provides formability for vacuum skin packaging.

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Thin, stretchy polyester films for vacuum skin packaging of food that can be used in double oven applications like microwaves and conventional ovens. The films have high elastic modulus, tensile strength, and elongation compared to conventional polyolefin films. The key is using a polyester inner layer with a high intrinsic viscosity (>0.75 dl/g) that allows good conformability and sealing in vacuum skin packaging. This layer is sandwiched between an external heat sealable layer and a food contact layer. The films can be biaxially oriented for double oven compatibility.

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Packaging process using heat-shrinkable films made from a specific type of thermoplastic polyester. The polyester contains a specific ratio of 1,4:3,6-dianhydrohexitol units (A), cyclic alicyclic diol units (B), and terephthalic acid units (C). The polyester has a reduced viscosity above 50 mL/g. This allows producing heat-shrinkable films with improved properties like higher glass transition temperatures, better heat resistance, and higher tear and yield strengths compared to conventional PETs. The films are prepared by extrusion and stretching processes. The high-viscosity polyester allows producing films with lower thicknesses for packaging compared to conventional PETs.

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Method for producing bio-based polyethylene terephthalate (PET) from renewable sources like corn starch, citrus peels, agricultural waste, and sugarcane. The process involves refining the biomass to extract components like starch, sugar, cellulose, and lignin. These are then converted into PET precursors like glycols and terephthalic acid. Melting and polymerizing these bio-based PET components creates bio-based PET resin that can be used in applications like packaging and fibers. This allows making PET from renewable resources instead of petroleum, reducing reliance on fossil fuels and addressing environmental concerns.

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Process to prepare high molecular weight polymers containing 2,5-furandicarboxylate (FDCA) units without discoloration, and using these polymers in bottles, fibers, and films. The process involves a three-step synthesis: (1) preparing a prepolymer with FDCA units, (2) melt polycondensation of the prepolymer under reduced pressure and catalysis, and (3) solid-state polymerization. The key features are using specific catalysts and conditions to avoid discoloration and low molecular weight byproducts.

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A process to produce high molecular weight, low color polyester polymers containing 2,5-furandicarboxylate (FDCA) groups suitable for commercial applications like bottles, fibers, and films. The process involves a three-step reaction sequence: 1) transesterification to make a prepolymer with FDCA ester groups, 2) catalyzed polycondensation of the prepolymer, and 3) melt polymerization. The key features are using a calcium or zinc salt catalyst in step 2, and processing the FDCA polymers at lower temperatures than PET to prevent coloration. The resulting polyesters have high molecular weight, low color, and properties suitable for commercial applications.

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Process for producing high molecular weight polymers with 2,5-furandicarboxylate (FDCA) groups in the main chain for bottle, film and fiber applications. The process involves a three-step synthesis: (1) transesterification of FDCA dimethyl ester with ethylene glycol, (2) polycondensation of the prepolymer with FDCA and ethylene glycol at reduced pressure, elevated temperature and catalyst, and (3) solid-state polymerization. The key innovations are using transesterification to prepare the prepolymer with a specific catalyst and conditions, followed by polycondensation with a mixed catalyst system, to achieve high molecular weight polymers without discoloration.

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