Water based selectable charge magnetic inks

Details Water based selectable charge magnetic inks Water based selectable charge magnetic inks

1977-03-02

1978-08-15

Edmundson, F.C.

Compositions

Magnetic

Flaw detection or magnetic clutch

H01F 128, C09D 1100

Patent

active

041070631

ABSTRACT:
Water based magnetic colloidal fluids, useable as inks, when prepared by coating chemically precipitated magnetite (Fe.sub.3 O.sub.4) with an adsorption site providing coating agent including certain organic anions, such as sulfates, sulfonates or amino carboxilates, and then dispersing the coated product with non-ionic, anionic or cationic surfactants may exhibit selectably cationic, anionic or non-ionic charge responsiveness.

REFERENCES:
patent: 3054751 (1962-09-01), Blake
patent: 3247117 (1966-04-01), Shoemaker et al.
patent: 3294686 (1966-12-01), Ayers
patent: 3498748 (1970-03-01), Greiner
patent: 3531413 (1970-09-01), Rosensweig
patent: 3764540 (1973-10-01), Khalafalla
patent: 3953218 (1976-04-01), Pollard
patent: 3990981 (1976-11-01), Kovac et al.
Rosensweig, International Science and Technology, Jul. 1966, pp. 48-56.

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