Patent · US Expired

Magnetic recording media

US4091143A · kind A · utility

7Cited by

7References

2Claims

0Family size

Assignee

BASF SE

Inventors

Hans-Joerg Hartmann
Guenter Vaeth · Schifferstadt, DE
Helmut Kopke · Bad Dürkheim, DE

Key dates

Filing date	Oct 22, 1975
Grant date	May 23, 1978
Priority date	—
Expiry date	Oct 22, 1995

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/256
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Magnetic recording media, the magnetic coating of which consists of a dispersion of elongated ferromagnetic chromium dioxide particles in an organic binder, the dispersions exhibiting particularly good storage stability. This is achieved by admixing 0.5 to 6% by weight, based on the amount of chromium dioxide pigment, of the zinc salt of an aliphatic carboxylic acid of 8 to 18 carbon atoms, during the manufacture of the chromium dioxide dispersions. Chromium dioxide dispersions with good storage stability and a high degree of orientation of the elongated magnetic particles in the magnetic coating are thus obtained in a simple manner.

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