Stabilization of magnetite pigments with heterocyclic nitrogen compounds

US4264462A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gunter Buxbaum · Krefeld, DE
• Bernd Stephan · Schweinfurt, DE
• Franz Hund · Krefeld, DE
• Gerhard Schroeder · Krefeld, DE

Key dates

• Filing date: Sep 21, 1978
• Grant date: Apr 28, 1981
• Expiry date: Sep 21, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/42
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A finely divided magnetite pigment such as is used in magnetic tapes is stabilized against oxidation by contact with a heterocyclic nitrogen compound such as morpholine, triazole, piperazine or substitution products thereof. The heterocyclic compound can be applied as a solution or in vapor form.