Emtec Magnetics Gmbh

Hans-Dieter Zettler

Peter Nagel

Axel Sch&uuml;nemann

Process for the preparation of a magnetic dispersion for magnetic recording media and magnetic recording media produced therewith

A process for the preparation of high-quality magnetic dispersions having an Hc>120 kA/m, a residual induction Mr/Mm &gE;0.9 and an orientation ratio of about 2.7 achieves, with a self-purging single-shaft blade-type kneading apparatus, very advantageous magnetic values of the magnetic coatings and excellent tape characteristics if at least a) the radial shear gradient in the gap between blade circumference and housing wall is from about 150 to about 1600, in particular from about 500 to about 1400, 1/sec, and b) the circumferential velocity of the kneading blade is from about 20 to about 80, in particular from about 35 to about 60, cm/sec.

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Grünstadt, Germany

Hans-Dieter Zettler