Method for preparation of a polyester
US11015021B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2018 |
| Grant date | May 25, 2021 |
| Priority date | — |
| Expiry date | May 7, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/42
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed in the present invention is a preparation method for a polyester, relating to the technical field of organic catalysis and polymeric materials. The preparation method in the present invention comprises: (1) using pyridine and saccharin in a ratio of 1:1 to prepare pyridine saccharin salt in tetrahydrofuran at 60° C. and separating the pyridine saccharin salt out in methanol and hexane. (2) Freeing out a small amount of pyridine from the pyridine saccharin salt in a heating state, catalyzing by the pyridine saccharin salt and pyridine a cyclic lactone or a carbonate to be ring-opened and polymerized to form the polyester; and the system has no other compound residues. (3) In the presence of an alcohol initiator, catalyzing by the pyridine saccharin salt the cyclic lactone to be ring-opened and polymerized to obtain the polyester. The catalytic system can efficiently synthesize a specific polylactone. Compared with a method for synthesizing a polyester by the use of a metal-containing catalyst in the prior art, the system has wide application. Moreover, the system is advantageous of no metal residue, narrow molecular weight distribution and no chain transesterification, and…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.