Patent · US Expired

Preparation of isocyanates having a light color

US5872278A · kind A · utility

8Cited by

2References

22Claims

0Family size

Assignee

BASF SE

Inventors

Rupert Kraus · Waldsee, DE
Martin Reif · Lichtenfels, DE
Bernd Bruchmann · Ludwigshafen, DE
Helmut Tesch · Bad Dürkheim, DE

Key dates

Filing date	Mar 18, 1998
Grant date	Feb 16, 1999
Priority date	—
Expiry date	Mar 18, 2018

Classification

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

Abstract

In a process for preparing isocyanates having a light color by reacting the corresponding amines with phosgene, the amines are treated with solid inorganic substances containing Lewis acid and/or Bronsted acid centers prior to the reaction with the phosgene.

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