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Poly(glycolic acid) for containers and films with reduced gas permeability

A glycolic acid, container technology, used in rigid containers, flexible containers, containers, etc.

Pending Publication Date: 2021-06-29
DAK AMERICAS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0042] PGA depolymerization is easy to carry out, although beneficial to PET recycling, but it is not necessary for the production of sufficiently high molecular weight PGA with a sufficiently high melt viscosity that can be melt processed with PET to cost-effectively produce high quality multi-layer containers) presents a challenge

Method used

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  • Poly(glycolic acid) for containers and films with reduced gas permeability
  • Poly(glycolic acid) for containers and films with reduced gas permeability
  • Poly(glycolic acid) for containers and films with reduced gas permeability

Examples

Experimental program
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Embodiment

[0149] Acquired at 22°C on a 600 MHz Bruker Avance III NMR spectrometer equipped with a QCI (H-P / C / N-D) cryoprobe 13 C NMR spectra. An inverse-gated pulse sequence with a flip angle of 30 degrees was used and 4096 scans and 16 dummy scans were acquired. The acquisition time was 0.9 s, and the relaxation delay was 3 s. Samples were dissolved in a 2:1 v / v mixture of 1,1,1,3,3,3-hexafluoro-2-propanol (99.9%, Fluorochem) and deuterochloroform (99.8%, VWR). Chromium(III) acetylacetonate (97%, Aldrich) was added as a relaxation agent. Quantitative 13 C NMR spectra were used for end group analysis and calculation of number average molecular weight (M n ).

[0150] The molecular weight and molecular weight distribution of the PGA polymers were determined by size exclusion (gel permeation) chromatography at 40°C. The measurement system was equipped with a Waters Styragel column and a Waters 2410 refractive index detector. The eluent used was Fluorochem 1,1,1,3,3,3-hexafluoro-2-p...

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Abstract

The present invention relates to poly(glycolic acid) for containers and films with reduced gas permeability. Compositions of high molecular weight poly(hydroxy acid) polymer having good thermal stability and a weight average molecular weight of >100,000 by GPC. The compositions include one or more chain-terminator compounds / impurities. A process including the steps of: first mixing glycolic acid and / or lactic acid (with chain-terminators), and a diol or di-acid initiator, and at least one multifunctional initiator to form a liquid monomer mixture in an agitated polycondensation reactor; then performing polycondensation to form a first solid reaction mixture; then, solid state polycondensing the solid reaction mixture to form a solid reaction mixture; then, mixing the solid reaction mixture with an appropriate reactive coupling agent in a melting and mixing extruder to couple and form the reaction mixture and form the final poly(hydroxy acid) polymer.

Description

[0001] Cross References to Related Applications [0002] This application is related to "Process of Making Poly(glycolic acid) for Containers and Films with Reduced Gas Permeability" filed concurrently with this application under Attorney Docket No. 510819US, the entire contents of which are incorporated herein by reference . technical field [0003] The present invention relates to compositions and methods for improving gas barrier properties in rigid polyester containers or film walls, especially carbonated soft drink (CSD) bottles and flexible packaging for oxygen sensitive products. Background technique [0004] Gas barriers can be of the passive type, where there is a physical impediment to the transport of diffusive gas molecules, or of the active type, where special additives chemically react with, react with, and scavenge diffusive gas molecules. gas molecules or capture diffusible gas molecules. Increasing polymer density to mechanically reduce molecular free volu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/06C08L67/02C08L67/04
CPCC08G63/06C08G63/912C08L67/02B29C45/0001B29D22/003B65D1/0215C08L2201/14C08L2203/10C08L2203/16C08L2205/02C08L67/04B29C49/0005B29L2031/7128B29K2067/003B29K2067/043B29K2067/046C08G63/82C08L101/00C08J5/18B32B27/36B32B2439/06C08J2367/02C08G63/08C08K5/1539C08K5/092
Inventor P·克齐奥斯T·泰勒
Owner DAK AMERICAS LLC