Glycolic acid polymers and method of producing the same
US11214704B2 · kind B2 · utility
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12Claims
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Key dates
| Filing date | Dec 9, 2019 |
| Grant date | Jan 4, 2022 |
| Priority date | — |
| Expiry date | Dec 9, 2039 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F6/625
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Described herein is a feasible, significantly simplified production method that avoids challenging lactonization steps and converts a low molecular weight aliphatic polyester, consisting of hydroxy acids and a comonomer, whose molecular weight has been increased by step-growth polymerization reactions. The molecular weight of the aliphatic polyester, based on comparison of initial and final weight average molecular weights (Mw,1/Mw,2), increased significantly at a rate which permits the use of reactive extrusion to produce high molecular weight aliphatic polyesters in a simple, economically feasible manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.