Patent · US Expired

Magnetic recording media

US3995089A · kind A · utility

8Cited by

5References

5Claims

0Family size

Assignee

Badische Anilin- & Soda-Fabrik Aktiengesellschaft

Inventors

Job-Werner Hartmann · Ludwigshafen, DE
Hans-Joerg Hartmann
Dieter Mayer · Ludwigshafen, DE
Peter Felleisen · Lampertheim, DE
Ursula Klein
Herbert Motz · Beindersheim, DE

Key dates

Filing date	Apr 2, 1975
Grant date	Nov 30, 1976
Priority date	—
Expiry date	Apr 2, 1995

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31609
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A magnetic recording medium in the form of a card having a non-magnetic support with a magnetic coating on one side of the support and a backcoating on the opposite side of the support, which backcoating exhibits improved scratch resistance and adherence to the support and improved frictional characteristics and consists essentially of 20 to 50% by weight of a binder mixture containing 10 to 60% by weight of an elastomeric polyurethane and, incorporated in the binder mixture, a non-magnetic pulverulent mixture of 10 to 40% by weight of conductive carbon powder and 60 to 90% by weight of platelet-shaped and spherical particles.

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