Process to prepare a cyclic oligomer and a cyclic oligomer obtainable thereby
US9725558B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 2013 |
| Grant date | Aug 8, 2017 |
| Priority date | — |
| Expiry date | Nov 27, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/78
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process to prepare a cyclic polyester oligomer composition having a cyclic polyester oligomer having furanic units, includes the step of reacting a monomer component, for example, 2,5-furan dicarboxylic acid and, for example, ethylene glycol, in a ring closing oligomerization at a reaction temperature and reaction time, for example, at 100° C. to 350° C. for 30 to 600 minutes to obtain a cyclic polyester oligomer having furanic units. The process yields a cyclic polyester oligomer composition which can be used in further ring-opening polymerization reactions to produce a polyester polymer. The cyclic polyester oligomer composition has a cyclic polyester oligomer having furanic units and less than 5% linear oligomeric polyester species in the composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.