Patent · US Active

Process for preparing diaminodiphenylmethanes

US7943724B2 · kind B2 · utility

2Cited by
15References
3Claims
0Family size

Assignee

Inventor

Key dates

Filing dateNov 7, 2006
Grant dateMay 17, 2011
Priority date—
Expiry dateDec 24, 2027

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC07C209/78
  • WIPO fieldOrganic fine chemistry
  • WIPO sectorChemistry

Abstract

Process for preparing diamino diphenyl methane and poly-(diamino diphenyl methane) comprising reacting aniline with formaldehyde in the presence of hydrogen chloride added in the gaseous form wherein the aniline contains 0.1 to 7 wt %, preferably 2 to 5 wt % of a protic chemical, preferably water.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.