Patent · US Expired

Ethylidene bisformamide, its preparation and use in preparing poly(vinylamine) and salts thereof

US4490557A · kind A · utility

23Cited by
3References
7Claims
0Family size

Assignee

Inventors

Key dates

Filing dateNov 5, 1981
Grant dateDec 25, 1984
Priority date—
Expiry dateNov 5, 2001

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 products 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.