Process for the preparation of aromatic carbamates and isocyanates
US4415745A · kind A · utility
2Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1982 |
| Grant date | Nov 15, 1983 |
| Priority date | — |
| Expiry date | Jan 28, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C269/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Production of aromatic polyisocyanates is achieved by a multireaction process comprising sequentially; the ammoxidation of a methylated aromatic, e.g. toluene; hydrolysis of the aromatic nitrile; conversion of the resultant amide to a carbamate; condensation with aldehyde; decomposition of the condensation product; and, recovery of the aromatic polyisocyanate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.