Method of preparing magnetic coating composition

Details Method of preparing magnetic coating composition Method of preparing magnetic coating composition

1992-09-28

1994-04-05

Langel, Wayne

Compositions

Magnetic

With wax, bitumen, resin, or gum

425204, 425205, H01F 100

Patent

active

053002440

ABSTRACT:
A method of preparing a magnetic coating composition comprises a first process for kneading ferromagnetic grains, a binder and a binder solution Y1 by use of a two-shaft continuous kneading and mixing machine to obtain a kneaded mixture K1 having a solid content within the range of 65 wt % to 95 wt %, a second process for kneading a binder solution Y2 and the kneaded mixture K1 by use of the two-shaft continuous kneading and mixing machine to obtain a primary diluted mixture K2 having a solid content within the range of 50 wt % to 70 wt %, a third process for diluting and dispersing the primary diluted mixture K2 in an organic solvent to obtain a secondary diluted mixture K3 having a solid content within the range of 25 wt % to 50 wt %, and a fourth process for finely dispersing the secondary diluted mixture K3 to obtain a dispersion mixture K4 having a solid content within the range of 25 wt % to 45 wt %.

REFERENCES:
patent: 4154895 (1979-08-01), Ogawa et al.
patent: 4619777 (1986-10-01), Melzer et al.
patent: 4634632 (1987-01-01), Ogawa et al.
patent: 4668568 (1987-05-01), Fujiyama et al.

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