Patent · US Expired

Magnetic recording media having a low coefficient of friction

US4074002A · kind A · utility

10Cited by

3References

3Claims

0Family size

Assignee

BASF SE

Inventors

Joachim Hack · Ludwigshafen, DE
Dieter Schaefer
Herbert Motz · Beindersheim, DE

Key dates

Filing date	Mar 8, 1976
Grant date	Feb 14, 1978
Priority date	—
Expiry date	Mar 8, 1996

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/259
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Magnetic recording media comprising a base and, applied thereto, at least one firmly adhering magnetic layer based on magnetic particles dispersed in a mixture of organic binders, wherein at least the uppermost magnetic layer additionally contains non-magnetic particles of precipitated silica having a primary particle diameter of from 0.02 to 0.1.mu., a secondary particle diameter of from 2 to 4.mu. and a pH of from 5 to 8. As a result of the incorporation of such a precipitated silica into the magnetic layer, the coefficient of friction between the latter and metals remains uniformly low even after prolonged use, and no stick-slip motion occurs.

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