Method for production of poly (trimethylene carbonate)
US6451949B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 2001 |
| Grant date | Sep 17, 2002 |
| Priority date | — |
| Expiry date | Feb 9, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/664
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a process for the production of poly(trimethylene carbonate) which comprises reacting trimethylene carbonate, a catalyst, and an alcohol, preferably a polyhydric alcohol, under nitrogen at atmospheric pressure and a moderate temperature, in a stoichiometric ratio to give the desired molecular weight of poly(trimethylene carbonate) in the presence of a catalyst selected from the group consisting of a salt, preferably an acetate, of an element of Group IA or IIA of the Periodic Table. In an alternative embodiment, high molecular weight poly(trimethylene carbonate) is produced without the use of an initiator, using the same catalyst and longer reaction times.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.