Preparation of magnetic recording media

Details Preparation of magnetic recording media Preparation of magnetic recording media

1985-08-27

1986-07-01

Pianalto, Bernard D.

Coating processes

Magnetic base or coating

Magnetic coating

427128, 4284259, 428694, 428900, H01F 1002

Patent

active

045979901

ABSTRACT:
A process for the preparation of a magnetic recording medium by dispersing pulverulent magnetic material in a binder mixture which is dissolved in an organic solvent and essentially consists of an elastomeric polyurethane and a high molecular weight hydroxyl-containing polymer, with addition of dispersing assistants and conventional additives, applying a layer of the dispersion, to which a diisocyanate and/or polyisocyanate has first been added, to a base material and the solidifying the layer and crosslinking the binder matrix, wherein the diisocyanate and/or polyisocyanate is added to the dispersion and, before applying the dispersion to the base, from 15 to 55% of the NCO groups present react with the hydroxyl-containing polymer of the binder mixture.

REFERENCES:
patent: 3144352 (1964-08-01), Talley et al.
patent: 3320090 (1967-05-01), Graubart et al.

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