Process for preparing a magnetic fluid

Details Process for preparing a magnetic fluid Process for preparing a magnetic fluid

1989-03-07

1990-12-11

Doll, John

Compositions

Magnetic

Flaw detection or magnetic clutch

H01F 128

Patent

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.

REFERENCES:
patent: Re32573 (1988-01-01), Furumura et al.
patent: 3549396 (1970-12-01), Dietz
patent: 3925095 (1975-12-01), Bockmann et al.
patent: 4604229 (1986-08-01), Raj et al.
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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