Method for preparing magnetic recording medium

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

1994-06-24

1995-06-13

Pianalto, Bernard

Coating processes

Magnetic base or coating

Magnetic coating

428900, H01F 1002

Patent

active

054240948

ABSTRACT:
A mixture containing a magnetic powder, a binder, and an organic solvent is kneaded by passing it through a twin-shaft continuous kneader while the shearing force applied to the mixture is varied by changing the set angle of paddles used. The temperature of the mixture is controlled to be higher than Tg and lower than the boiling point of the organic solvent when it passes through the maximum shearing force zone, and to be lower than the temperature of the mixture upon its passage through the maximum shearing force zone, preferably lower than Tg when it passes through zones other than the maximum shearing force zone. There is obtained a magnetic recording medium which has improved dispersion of magnetic powder and excellent electromagnetic properties as well as a low coefficient of friction and improved transport stability.

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