Method for producing magnetic coating composition and magnetic r

Details Method for producing magnetic coating composition and magnetic r Method for producing magnetic coating composition and magnetic r

1991-06-13

1993-08-10

Johnson, Jerry

Compositions

Magnetic

With wax, bitumen, resin, or gum

252 6253, 366601, 416 38, C04B 3504, H01F 100, H01F 126

Patent

active

052346145

ABSTRACT:
A magnetic coating composition prepared by a method comprising a wetting step for wetting powder materials including a magnetic powder with a small amount of a solvent in a kneading machine having an agitation means in a closed container, a first kneading step comprising adding an amount of a binder resin and an amount of a solvent to a mixture from the wetting step and mixing and kneading it, a second kneading step comprising continuously adding the solvent till a consumed power of a kneading apparatus reaches maximum, a third kneading step comprising stopping the addition of the solvent at the maximum consumed power and further kneading the mixture, and a dilution step comprising gradually adding the solvent to the mixture while applying shear force, in which composition, the magnetic powder is highly dispersed and which provides a coating type magnetic recording medium having good properties.

REFERENCES:
patent: 4002891 (1977-01-01), Porter
patent: 4076220 (1978-02-01), Nakashima
patent: 4229312 (1980-10-01), Nagashiro
patent: 4946615 (1990-08-01), Mizuno
Journal of the Society of Powder Technology (Japan) vol. 25, No. 6, pp. 344-349 (1988) Abstract only.
Kagaku Kogaku Ronbunshu, vol. 15, No. 4, pp. 747-753 (1989).

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