Magnetic record carrier and method of making it

Details Magnetic record carrier and method of making it Magnetic record carrier and method of making it

G - Physics

11

B

352/31

G11B 5/842 (2006.01) G11B 5/706 (2006.01) G11B 5/712 (2006.01) G11B 5/845 (2006.01)

Patent

CA 1251860

A B S T R A C T MAGNETIC RECORD CARRIER AND METHOD OF MAKING IT The magnetic record carrier consists of a substrate and a magnetic coating which comprises a binder and sub- stantially non-aggregated iron particles. The iron particles can have a coating of SiO2, and can be available either as a thin layer covered with the binder, or homogeneously dispersed in the binder. For making the magnetic record carrier, coated or uncoated iron oxide particles are applied onto the substrate and subsequently reduced in a hydrogen-containing atmosphere at temperatures between 220 and 350°C. In the production where the iron particles are distributed in the binder, reduction takes place after a dispersion containing the binder, the iron oxide particles and a solvent has been spun onto the substrate and cured. In the production where the iron oxide particles form a thin layer, reduction is effected after the coated iron oxide particles have been applied onto the substrate as a mono-layer. It is only then that a dispersion containing the binder and a solvent is applied and cured.

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