Process for the production of aliphatic isocyanates
US9045395B2 · kind B2 · utility
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10Claims
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Key dates
| Filing date | May 6, 2013 |
| Grant date | Jun 2, 2015 |
| Priority date | — |
| Expiry date | May 6, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C265/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention is an aliphatic or cycloaliphatic isocyanate obtained form a process comprising the steps of reacting an aliphatic or cycloaliphatic primary amine, with phosgene in the presence of an inert solvent, wherein the initial reaction temperature is between 100 and 130° C. and the temperature is subsequently ramped to 150 to 180° C. during the course of the reaction, the solvent to amine weight ratio is 95:5 to 80:20, the total reaction pressure is maintained between 50 and 350 psig and the amine is rapidly dispersed in the phosgene through injection in a region of high efficiency mixing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.