Method of manufacturing diphenylmethane dicarbamic acid diesters
US4699994A · kind A · utility
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11Claims
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Key dates
| Filing date | Sep 8, 1986 |
| Grant date | Oct 13, 1987 |
| Priority date | — |
| Expiry date | Sep 8, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C271/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
According to a method of manufacturing a diphenylmethane dicarbamic acid ester by reacting an N-phenyl carbamic acid diester with a methylating agent in an aqueous acid solution, the aqueous acid solution is an aqueous inorganic acid solution, and the concentration of the N-phenyl carbamic acid ester in the aqueous acid solution is not more than the solubility thereof at the reaction temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.