Process for preparing a magnetic fluid

Compositions – Magnetic – Flaw detection or magnetic clutch

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H01F 128

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active

049768832

ABSTRACT:
A magnetic fluid containing fine particles of ferrite stably dispersed in a carrier liquid is prepared by adding carrier liquid and a dispersing agent selected from N-polyalkylenepolyamine-substituted alkenylsuccinimide, an oxyalkylene-substituted phosphoric acid ester and a nonionic surfactant, and, if required, hydrocarbon solvent having a low boiling point to particles of ferrite which is coated with water-soluble surfactant and subjecting the resulting mixture to a dispersion treatment and, if required, removal of the hydrocarbon solvent.

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patent: 4645611 (1987-02-01), Campbell et al.
patent: 4687596 (1987-08-01), Borduz et al.
patent: 4762568 (1988-08-01), Nakamura et al.

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