Process for enhancing the molecular weight of a polyester
US10072119B2 · kind B2 · utility
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4References
20Claims
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Key dates
| Filing date | Mar 11, 2015 |
| Grant date | Sep 11, 2018 |
| Priority date | — |
| Expiry date | Mar 11, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/866
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The molecular weight of a semi-crystalline starting polyester comprising ethylene 2,5-furandicarboxylate units is enhanced by heating the semi-crystalline starting polyester, having a melting point Tm, at a temperature in the range of (Tm-40° C.) to Tm to obtain a solid stated polyester, where the semi-crystalline starting polyester has an intrinsic viscosity of at least 0.45 dL/g, and an amount of carboxylic acid end groups in the range of 15 to 122 meq/kg.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.