Preparing N-vinylformamide
US4578515A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1984 |
| Grant date | Mar 25, 1986 |
| Priority date | — |
| Expiry date | Jun 7, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C233/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Ethylidene bisformamide is prepared by reacting, at elevated temperatures, dry acetaldehyde and formamide in the presence of an acidic catalyst and an ammonia scavenger such as acetic anhydride. The bisformamide is recovered as a bottoms product of high speed low residence time distillation techniques, e.g., wiped film evaporation. The resulting ethylidene bisformamide may be cracked to N-vinylformamide, which monomer is useful in the preparation of active polymers and copolymers, including poly(vinylformamide) which can be hydrolyzed to poly(vinylamine) salts by contact with acid. These amine salts can then be converted to the free amines, which are precursors of polymeric dyes and pharmaceuticals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.