Process for the preparation of a polyester
US10590235B2 · kind B2 · utility
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19Claims
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Key dates
| Filing date | Sep 14, 2016 |
| Grant date | Mar 17, 2020 |
| Priority date | — |
| Expiry date | Nov 26, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/78
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polyester including ethylene 2,5-furandicarboxylate units is prepared in a process, where in an esterification step a 2,5-furandicarboxylate compound is reacted with ethylene glycol to form an ester composition, including components with 2-hydroxyethyl and 2,5-furandicarboxylate moieties; where in a polycondensation step the ester composition thus obtained is subjected to polycondensation at reduced pressure in the presence of a polycondensation catalyst to obtain a polycondensate; and where during the polycondensation step 2,5-furandicarboxylic acid is added to the ester composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.