Patent · US Expired

Preparation of aromatic polyisocyanates

US5391683A · kind A · utility

23Cited by
1References
22Claims
0Family size

Assignee

Inventors

Key dates

Filing dateOct 18, 1993
Grant dateFeb 21, 1995
Priority date—
Expiry dateOct 18, 2013

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC07C263/10
  • WIPO fieldOrganic fine chemistry
  • WIPO sectorChemistry

Abstract

Aromatic polyisocyanates, e.g., toluene diisocyanate, are prepared by reacting/contacting at least one aromatic compound (A) bearing at least two primary amine substituents, e.g., toluenediamine, xylylenediamine and/or phenylenediamine,, with phosgene, in gaseous phase and in a reactor/reaction zone devoid of active mechanical stirring.

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