Process for producing a magnetic recording medium

Details Process for producing a magnetic recording medium Process for producing a magnetic recording medium

1990-06-14

1990-12-25

Pianalto, Bernard

Coating processes

Magnetic base or coating

Magnetic coating

428695, 428900, B05D 512, H01F 1002

Patent

active

049801996

ABSTRACT:
A process for producing a magnetic recording medium is disclosed, comprising steps of (1) kneading ferromagnetic fine powders and binders with solvents, (2) optionally adding further the binders and the solvents to disperse the powders and (3) coating the resulting magnetic coating composition on a non-magnetic support, wherein the ferromagnetic fine powders have a crystallite size of not larger than 500 .ANG., the binders have at least one polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, --PO.sub.3 M.sub.2, --OPO.sub.3 M.sub.2 and --COOM (wherein M is hydrogen atom, an alkali metal or ammonium) and at least one epoxy group in the molecule and a step of adding a fatty acid having 12 to 26 carbon atoms is carried out after the dispersing step (2). Preferably, a step of crushing the ferromagnetic powders is additionally carried out before the kneading step (1).

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