Method for preparing magnetic recording medium

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

1994-12-01

1996-04-23

Pianalto, Bernard

Coating processes

Magnetic base or coating

Magnetic coating

427209, 4274071, B05D 312

Patent

active

055101402

ABSTRACT:
A first object of the invention is to provide a magnetic recording medium having minimized dropouts immediately after preparation, a reduced dropout increase and an electromagnetic property loss with the lapse of time, and good durability of coatings such as a magnetic layer. A second object is to provide a magnetic recording medium including a backcoat layer having high durability and antistatic effect in addition to the above advantages. A third object is to achieve a productivity increase and a cost reduction in the manufacture of such a magnetic recording medium. To attain these objects, the invention provides a method for preparing a magnetic recording medium comprising a kneading step of kneading solids and a binder solution, a dispersing step of dispersing the solids in the compound resulting from the kneading step, and a viscosity adjusting step of adding a viscosity adjusting solution to the dispersion resulting from the dispersing step to form a paint composition wherein filtering steps are included after the steps for filtering fluids to be filtered (including the binder solution, compound, dispersion, viscosity adjusting solution, and paint) and a filter means having a 95% cut filtration precision within a specific range is used in each of the filtering steps.

REFERENCES:
Pall News, P-52, 1984, 3 pages (no month avail.).
Pall News, P-57, 1985, 3 pages (no month avail.).

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