Patent · US Expired

Process for the joint production of aromatic amines and iron oxide pigments

US4145228A · kind A · utility

5Cited by

4References

17Claims

0Family size

Assignee

Euteco S.p.A. · IT

Inventors

Piero D. Croce · Milano, IT
Tullio Pellizzon · Cascina Uboldi, IT
Peter Schwarz · Speyer, DE
Luigi Piccolo · Milano, IT

Key dates

Filing date	Nov 17, 1977
Grant date	Mar 20, 1979
Priority date	—
Expiry date	Nov 17, 1997

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01P2006/60
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Aromatic amines and iron oxide pigment are produced by reacting a ferrous salt, a reduceable aromatic nitrogen compound chosen from nitroderivatives with a single nitro-group or with two nitro-groups and azoderivatives, and a basic compound, chosen from hydroxides and carbonates of ammonium, alkali metals and alkaline earth metals, operating at 25.degree.-200.degree. C. in an aqueous medium. The color of the pigment can be varied from yellow to black by increasing the reaction temperature and the molar ratio between ferrous salt and aromatic nitrogen compound.

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