Method for producing a magnetic recording medium including wet o

Details Method for producing a magnetic recording medium including wet o Method for producing a magnetic recording medium including wet o

1995-07-11

1997-05-27

Bareford, Katherine A.

Coating processes

Direct application of electrical, magnetic, wave, or...

Pretreatment of substrate or post-treatment of coated substrate

427549, 427550, 427130, 427131, H01F 100

Patent

active

056330502

ABSTRACT:
A method for producing a magnetic recording medium which results in the effective oblique orientation of magnetic fine particles without aggregation of the particles. The method results in a magnetic recording medium having an upper magnetic layer containing needle-shaped, granular, or plate-like magnetic particles, and at least one lower nonmagnetic layer formed on a nonmagnetic support so that the magnetic particles have the maximum degree of orientation in an oblique or perpendicular direction with respect to a surface of the support. The oblique or perpendicular orientation is performed in the wet state of a magnetic layer and in the condition in which the amount of the solvent residue in the upper magnetic layer is 40 to 80% after the upper magnetic layer and the lower nonmagnetic layer are applied sequentially or simultaneously to form a multilayer. The upper magnetic layer is formed so as to be thinner than the lower nonmagnetic layer and subjected to horizontal orientation with a plane of the surface of the support.

REFERENCES:
patent: 4745001 (1988-05-01), Miyoshi et al.
patent: 4844946 (1989-07-01), Komatsu et al.
patent: 4874633 (1989-10-01), Komatsu et al.
patent: 4999217 (1991-03-01), Watanabe et al.
patent: 5229173 (1993-07-01), Suzuki et al.
patent: 5336559 (1994-08-01), Yamagishi et al.

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