MAGNETIC RECORDING MEDIUM

A magnetic dispersion, consisting of fine particles of iron powder or iron alloy powder having a BET value of more than 35 m /g, which powder is dispersed in a polymeric binder and an organic solvent and has markedly improved filterability, is obtained by using certain low-molecular phosphoric acid...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	SCHMIDT, JUERGEN, SCHROER, WOLF-DIETER, VASS, ATTILA, SAUTER, JUERGEN, KUNTZ, GUENTHER
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS CORRECTING FLUIDS DYES FILLING PASTES INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INKS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PHYSICS POLISHES USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	A magnetic dispersion, consisting of fine particles of iron powder or iron alloy powder having a BET value of more than 35 m /g, which powder is dispersed in a polymeric binder and an organic solvent and has markedly improved filterability, is obtained by using certain low-molecular phosphoric acid esters of the general formula I or II in combination with a dispersion-active compound which contains at least one polar group capable of absorption on the magnetic pigment. The polar group of the dispersion-active compound can be an acidic or alkaline or amphoteric group, a group which is capable of forming hydrogen bonds, or a polarisable group. The dispersion-active compound can be a polycondensate, a polyaddition product or a copolymer, which can also be used in the magnetic dispersion in combination with other conventional polymeric binders.