Process for polishing the surfaces of magnetic storage disks
AssigneeBASF SE
InventorsKarl Deimling, Roland Falk, Aribert Krug, Peter Nagel, Rudolf Sand
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Abstract
A process for polishing the ground surfaces of magnetic storage disks which consist of a rigid substrate provided on both sides with a firmly adhering magnetic coating consisting of a magnetic material finely dispersed in an organic polymer and conventional additives, by pressing felt rings or felt disks against the moving magnetic storage disk, to the surface of which an aqueous emulsion containing butyl acetate with or without butane-1,4-diol is applied.
Claims4
A process for polishing the surfaces of the ground magnetic coatings of magnetic storage disks, said disks consisting essentially of a rigid substrate provided on both sides with a firmly adhering magnetic coating of a magnetic material finely dispersed in a cured organic binder, which process comprises;
- pressing a felt ring or felt disk against the surfaces of the magnetic storage disks as they are rotated alternately in opposite directions, said felt ring or felt disk having applied thereto
- an aqueous emulsion consisting essentially of water, one or more emulsifiers and from 2 to 25% by weight of butyl acetate, based on the weight of the emulsion, and thereafter rinsing the disks to remove the emulsion and any abraded material contained therein.
Dependencies are inferred from the claim text.