Poly(glycolic acid) for containers and films with reduced gas permeability
US12065538B2 · kind B2 · utility
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9Claims
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Key dates
| Filing date | Oct 21, 2022 |
| Grant date | Aug 20, 2024 |
| Priority date | — |
| Expiry date | Oct 27, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2203/16
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
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 which may be incorporated into the polymer and rendered harmless by the presence of appropriate amounts of bi-functional and multi-functional polymerization initiators, processes of preparing the polymer, and uses of the polymer to provide containers and polymer films or film-derived packages prepared therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.