Method for preparing magnetic recording medium

Details Method for preparing magnetic recording medium Method for preparing magnetic recording medium

1988-10-06

1989-10-17

Pianalto, Bernhard

Coating processes

Magnetic base or coating

Magnetic coating

427128, 427366, 4273935, B05D 512

Patent

active

048746363

ABSTRACT:
A method for preparing a magnetic recording medium comprising the steps of: dispersing ferromagnetic particles in a binder solution; coating the resulting magnetic coating composition on a nonmagnetic support to provide a magnetic layer; drying the magnetic layer; and providing a calendering treatment with the magnetic layer, wherein the binder solution comprises at least one compound selected from the group consisting of a polyurethane resin having a tan .delta. peak temperature of 30.degree. C. or higher as a result of measuring dynamic viscoelasticity, a cellulose acetate butyrate, a cellulose acetate propionate, and a butyral resin; and when the magnetic layer is dried until the solvent content of the magnetic layer is in the range of from 0.1 to 3 wt %, the calendering treatment is provided with the magnetic layer.

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