Preparation of urethane and carbonate products
US5223638A · kind A · utility
8Cited by
1References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1991 |
| Grant date | Jun 29, 1993 |
| Priority date | — |
| Expiry date | Apr 29, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G71/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a process for preparing urethanes and carbonates from an amine or an alcohol, carbon dioxide and a hydrocarbyl halide. The amine or alcohol is reacted with carbon dioxide in a suitable solvent system and in the presence of an amidine or guanidine base, to form the ammonium carbamate or carbonate salt which is then reacted in a polar aprotic solvent with a hydrocarbyl halide. Polymer products can also be prepared utilizing this process or utilizing the resulting urethanes and carbonates under standard polymerization conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.