Process for producing novel block alkylene polycarbonate copolymers
US4665136A · kind A · utility
19Cited by
11References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1986 |
| Grant date | May 12, 1987 |
| Priority date | — |
| Expiry date | Apr 7, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/323
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is a novel class of block copolymers and a process of making the same. An alkylene oxide is reacted with CO.sub.2 in an organic solvent in the presence of an organometallic catalyst to form a polyalkylene carbonate. A second alkylene oxide is subsequently added without the addition of catalyst. The resulting product is a block copolymer comprising distinct, covalently linked, alkylene carbonate blocks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.