Method for surface treatment of ferromagnetic fine powder and fo

Details Method for surface treatment of ferromagnetic fine powder and fo Method for surface treatment of ferromagnetic fine powder and fo

1984-05-24

1985-08-06

Pianalto, Bernard D.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427127, 427128, 427130, 427132, H01F 1002

Patent

active

045335656

ABSTRACT:
A method for the surface treatment of a ferromagnetic fine powder is disclosed. The method increases the dispersibility of the powder in a magnetic coating composition. The method comprises subjecting a magnetic composition to a dispersing processing, with the magnetic composition containing (1) a ferromagnetic fine powder, (2) at least one polar compound selected from a group consisting of such compounds as to have one or more of --COOH, --CONH.sub.2, --CONH.sub.2, --PO.sub.3 H, --SO.sub.3 H, --OH or --NH.sub.2 in a molecule and quaternary ammonium salts, and (3) an organic solvent capable of dissolving the polar compound, and evaporating the organic solvent from the magnetic composition.

REFERENCES:
patent: 3790407 (1974-02-01), Merten
patent: 4335183 (1982-06-01), Hosaka

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