High IV PET for Packaging Applications

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.

Source

PET (polyethylene terephthalate) material with high barrier properties for packaging applications like bottles that have improved water and oxygen barrier performance compared to regular PET. The barrier enhancement is achieved by blending PET with additives like polylactic acid, inorganic fillers, and silane coupling agents during polymerization. The fillers like graphene oxide, calcium carbonate, and titanium dioxide improve barrier properties by extending the penetration path of water and oxygen molecules. The coupling agent helps distribute the fillers evenly in the material.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

High-intrinsic-viscosity PET regranulate for extrusion blow molding containers that can be recycled like standard PET. The regranulate has an intrinsic viscosity (IV) of at least 0.95 dl/g, allowing it to be extruded into containers without collapsing during blow molding. The regranulate is made by modifying PET recyclate with carboxyl and hydroxyl end groups that combine during heating or vacuum drying to increase IV. This avoids using specialized extrusion blow molding PET compounds that can't be recycled. The modified regranulate can be used to make containers that can be blown, labeled, and recycled like regular PET bottles.

Source

Fully biobased, semi-crystalline thermoplastic polyesters for hot fill packaging applications made by melt polymerization followed by solid state post condensation. The polyesters are based on biobased monomers like isoidide and furandicarboxylic acid. The melt polymerization allows high molecular weight buildup at mild conditions, avoiding degradation and color formation. The solid state post condensation further enhances molecular weight and crystallinity. The resulting biobased polyesters have glass transition temperatures above 93°C for hot fill packaging without requiring special modifications.

Source

Producing bio-based polyethylene terephthalate (PET) from renewable sources like sugarcane, corn starch, fruit peels, and agricultural waste. The method involves converting these biomaterials into PET components like monoethylene glycol (MEG) and terephthalic acid (TA) through processes like fermentation, distillation, and catalysis. These bio-based PET components are then polymerized into PET. The bio-based PET can be used to make packaging, containers, fibers, etc. This allows making PET from renewable resources instead of fossil fuels, reducing waste from agricultural streams, and enabling closed-loop recycling of bio-based PET.

Source

Extrusion blow molding method to produce recyclable PET bottles and containers that overcome issues with using low intrinsic viscosity PET resins. The method involves co-extruding PET resins with different intrinsic viscosities, like a higher viscosity bottle grade PET and a lower viscosity recycled PET. This allows using recycled PET without compromising bottle strength or recyclability. The co-extruded layers are combined to form a preform that is blow molded into a bottle. The higher viscosity PET forms an inner layer and provides structure, while the lower viscosity PET forms the outer layer. The higher viscosity PET prevents collapse during blow molding. The resulting bottle has recyclable content and better strength compared to using only low viscosity PET.

Source

Modified copolyester for clear beer containers with improved barrier properties and transparency. The copolyester is made by reacting terephthalic acid, diols, and modified nanoclay to form prepolymers. Polyethylene naphthalate and modified polybutylene naphthalate are mixed in the melt to form the copolymer. Crystallization and solid-state polymerization are done to upgrade the viscosity. The modified copolyester has intrinsic viscosity >0.5 dL/gm and is used to make clear beer kegs and containers with improved oxygen, carbon dioxide, and water vapor barrier properties.

Source

Method for increasing the intrinsic viscosity of recycled PET to improve mechanical properties like strength and toughness for applications like packaging tapes. The method involves treating recycled PET under anaerobic conditions using microwave radiation. The PET is microwaved to increase molecular chain length and then further processed into the final product. The microwave treatment is done at frequencies around 2.45 GHz and temperatures of 180-230°C. The microwaved PET can be further dried and heated before processing. This allows using recycled PET with lower intrinsic viscosity to make high-performance products like packaging tapes.

Source

Procedure for manufacturing plastic containers like aerosol bottles that can be fully made of plastic instead of metal or glass. The method involves injection molding a preform with a lip neck, blowing it into the final container shape, and attaching a valve to the neck. The lip neck allows the valve to be securely joined to the container body. This enables fully plastic aerosol bottles without needing metal valve components. It allows using plastic materials like PET for aerosols instead of metal or glass.

Source