Bayer Aktiengesellschaft

Bayer Aktiensegellschaft

Peter R Schick

Friedrich Jonas

Jurgen Wiese

Lutz Leitner

Improved iron oxide pigments useful in the manufacture of magnetic recording carriers or for coloring inorganic or organic materials are iron oxide pigments having an iron (II) content of at least 5% by weight calculated as FeO after-treated with a phenolic compounds of the formula ##STR1## wherein X is O or NH, and

Thermostable iron oxide pigments, processes for their preparation and

An improved magnetic dispersion for magnetic recording which comprises magnetic pigment, abrasive, carbon black or another additive for regulating conductivity, binder, solvent, lubricant, and wetting agent, wherein the improvement comprises quantities of wetting agent, lubricant, or both being between at least 100 to 140% of the individually determined saturation adsorptions of the wetting agent and lubricant, with the proviso that the minimum quantity of wetting agent or lubricant is 80% of the individually determined saturation adsorption.

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Krefeld, Germany

Peter R Schick