Patent · US Expired

Manufacture of magnetic recording media having a wear-resistant surface

US4272563A · kind A · utility

6Cited by

1References

4Claims

0Family size

Assignee

BASF SE

Inventors

Werner Steck · Ludwigshafen, DE
Werner Loeser · Ludwigshafen, DE
Manfred Steuerwald · Bischofswerda, DE
Gerd Wunsch · Speyer, DE
Paul Deigner · Bad Dürkheim, DE

Key dates

Filing date	Feb 3, 1977
Grant date	Jun 9, 1981
Priority date	—
Expiry date	Feb 3, 1997

Classification

Technology area (CPC G)Physics
CPC primaryG11B5/84
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A process for the manufacture of wear-resistant magnetic recording media comprising a dimensionally stable base, a thin ferromagnetic metal layer, containing cobalt and/or nickel, firmly bonded thereto and a thin protective layer applied thereon. The protective layer is produced by treating the recording medium in a liquid basic medium, containing gaseous oxygen, for from 1 to 60 minutes at from 5.degree. to 70.degree. C., washing and drying the treated recording medium and then heating it in air at from 170.degree. to 300.degree. C. This method offers a particularly simple way of providing the ferromagnetic layer of the recording medium with a thin but uniform, mechanically stable and wear-resistant protective layer.

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