Preparation of methylenedi(phenylurethane)
US5066827A · kind A · utility
1Cited by
1References
11Claims
0Family size
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Key dates
| Filing date | Jun 29, 1990 |
| Grant date | Nov 19, 1991 |
| Priority date | — |
| Expiry date | Jun 29, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C269/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Methylenedi(phenylurethane), MDU, is selectively prepared by condensing an alkyl N-phenylcarbamate with a methylenating agent, e.g., formaldehyde or a precursor thereof, in the presence of a catalytically effective amount of the protonic acid, hydrofluoric acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.