Crystalline PET for Advanced Packaging

Packaging container made from biomass-derived PET with comparable mechanical properties to conventional PET. The biomass-derived PET has specific X-ray diffraction characteristics that correlate with improved buckling strength. The container is formed from a PET resin derived from biomass sources. To ensure comparable properties, the X-ray diffraction peak width and shift are measured. The width of the halo peak (half value width) should be 0.94-1.06 times that of fossil fuel-derived PET. The peak position difference between top and center width should be 0.24-5.08 degrees. This indicates a more uniform crystal structure in the biomass-derived PET. These X-ray diffraction characteristics can be used as a quality control metric for biomass-derived PET packaging containers.

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A high-barrier polyethylene resin composition with improved gas barrier properties and a method to prepare it. The composition contains 60-80 parts of polyethylene, 5-20 parts of liquid crystal polymer (LCP), and 5-20 parts of polyethylene terephthalate (PET). The LCP and PET are dispersed in the polyethylene matrix to create a tortuous diffusion path for gas molecules, improving barrier properties. The composition can be made by blending the components in a specific ratio using a twin-screw extruder.

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Modified copolyester with improved barrier properties for making transparent packaging containers like beverage bottles. The copolyester is prepared by reacting terephthalic acid, monoethylene glycol, and other diols with modified transparent polybutylene naphthalate (PBN) in the presence of catalysts. The modified PBN has naphthalene dicarboxylic acid, 1,4-butane diol, and isophthalic acid or monoethylene glycol. This process results in a copolyester with intrinsic viscosity >0.5 dL/g, allowing containers withstand higher temperatures, while maintaining transparency and improved barrier properties.

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A high molecule nucleating agent for accelerating crystal formation in polyester resins like polyethylene terephthalate (PET) for faster processing and improved properties like clarity. The nucleating agent is a modified polyphthalic acid glycol ester containing a high molecular weight base material like polyethylene, along with ring siloxane, naphthenic base, and polypropylene. The modified ester promotes faster crystal growth during polymerization to speed up processing without sacrificing properties like transparency.

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