Patent · US Expired

Flexible magnetic recording media having a backing coating containing a polyurethane resin having a phosphate group and precipated silica

US5346761A · kind A · utility

2Cited by

10References

2Claims

0Family size

Assignee

BASF Magnetics GmbH · DE

Inventors

Hermann Roller · Ludwigshafen, DE
Peter Engelhardt · Hessisch Oldendorf, DE
Reinhold Baur · Ortenberg, DE
Michael Bobrich · Haßloch, DE
Werner Latzel · Oberkirch, DE
Werner Lenz · Bad Dürkheim, DE
Rudolf Suettinger · Heidelberg, DE

Key dates

Filing date	May 14, 1993
Grant date	Sep 13, 1994
Priority date	—
Expiry date	May 14, 2013

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31551
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

In flexible magnetic recording media consisting essentially of a web-like nonmagnetic substrate, the magnetic layer is applied to one main side of the web-like substrate and a backing coating formed on the opposite main side of the substrate from a polymeric binder and nonmagnetic fillers as well as supporting pigments, the backing coating contains a precipitated silica treated on the surface with a phosphate-containing polyurethane.

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