Process for the production of a magnetic recording material with

Details Process for the production of a magnetic recording material with Process for the production of a magnetic recording material with

1984-02-27

1986-03-25

Lesmes, George F.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427 48, 427130, B05D 314

Patent

active

045782806

ABSTRACT:
This invention relates to a process for the production of a magnetic recording material having at least one layer of magnetic oxidic and/or metallic needle shaped pigments with dimensional anisotropy and/or some other type of magnetic anisotropy, e.g. crystalline, dielectric or magnetic field induced anisotropy, which process may be used to produce a layer having perpendicular anisotropy or a layer which passes from an initial perpendicular anisotropy to an isotropic distribution of the preferential magnetic axes of the pigments. According to the present process, the magnetic dispersion, after having been applied to the layer support, is subjected to an external magnetic field while still in the state of a liquid suspension, with the result that the pigments move with the preferential axis thereof into the perpendicular axis of the layer, and the pigments are subsequently fixed by drying.

REFERENCES:
patent: 3131078 (1964-04-01), Fuller et al.
patent: 3172776 (1965-03-01), Manly
patent: 3627580 (1971-12-01), Krall
patent: 4208447 (1980-06-01), Bate et al.
patent: 4271782 (1981-06-01), Bate et al.
patent: 4332834 (1982-06-01), Takei
patent: 4451502 (1984-05-01), Takada et al.

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