Process for the preparation of aliphatic isocyanates
US4151193A · kind A · utility
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1References
10Claims
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Key dates
| Filing date | Dec 12, 1977 |
| Grant date | Apr 24, 1979 |
| Priority date | — |
| Expiry date | Dec 12, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C263/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Symmetric ureas are converted to aliphatic isocyanates in high yields by reacting said ureas with phosgene at temperatures of at least 150.degree. C. and in a solvent having a boiling temperature greater than 150.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.