Patent · US Expired

Manufacture of ferromagnetic, acicular metallic iron particles by hydrogen reduction

US4050962A · kind A · utility

20Cited by

9References

8Claims

0Family size

Assignee

BASF SE

Inventors

Eberhard Koester · Bischofswerda, DE
Gerd Wunsch · Speyer, DE
Eduard Schoenafinger
Henning Schneehage

Key dates

Filing date	Jul 14, 1975
Grant date	Sep 27, 1977
Priority date	—
Expiry date	Jul 14, 1995

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01P2006/42
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A process for the manufacture of acicular ferromagnetic metal pigments containing iron, having a reduced field strength distribution and a steeper residual magnetization curve, by applying equivalent amounts of an alkaline earth metal cation and of a monobasic, dibasic or tribasic aliphatic carboxylic acid of up to 6 carbon atoms onto appropriate acicular iron oxides and then reducing the treated oxides.

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