Catalyst for producing aliphatic polycarbonate and the preparation thereof
US6815529B2 · kind B2 · utility
6Cited by
1References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2001 |
| Grant date | Nov 9, 2004 |
| Priority date | — |
| Expiry date | Dec 1, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/305
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention relates to a catalyst for producing aliphatic polycarbonate, which is composed of a rare-earth coordination compound; an alkyl metal compound; a polyol; and a carbonate. The catalytic efficiency of the catalyst of the present invention is more than 8×104 g polymer/mol RE(RE is rare earth metal). The number average molecular weight of the polymer is higher than 30,000. The degree of carbon dioxide fixation is more than 42 wt % and the content of alternative sequence structure exceeds 97%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.