| 摘要 |
The first object of the present invention is to provide a magnetic recording medium which has fewer dropouts immediately after production, prevents dropouts from increasing with time, prevents the deterioration in electro-magnetic conversion properties, and has high-durability coating such as a magnetic layer. The second object of the present invention is to provide a magnetic recording medium which has high-durability back-coat layer and has high charge prevention effect by the back-coat layer in addition to the features of the first object. The third object of the present invention is to improve productivity and to reduce the cost of production when such a magnetic recording medium is produced. In a production method including a step of kneading a solid content and a binder solution, a step of suspending solid material in the kneaded product, and a step of adding a viscosity adjustment solution to the dispersion to obtain a coating material, wherein materials (binder solution, kneaded material, dispersion, viscosity adjustment agent, coating material) are filtered after each process step described above, and filtration means capable of removing 95 % of a predetermined range is used at each filtration step.
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