Process for preparing a magnetic fluid

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

1989-02-14

1990-09-11

Russel, Jeffrey E.

Compositions

Magnetic

Flaw detection or magnetic clutch

H01F 128

Patent

active

049561138

ABSTRACT:
A magnetic fluid containing fine particles of ferrite stably dispersed in a low vapor pressure base oil is prepared by adding N-polyalkylenepolyamine-substituted alkenylsuccinimide (and a low vapor pressure base oil) to a suspension of fine particles of surfactant-adsorbed ferrite dispersed in a low boiling point hydrocarbon solvent, heating the resulting mixture, separating the hydrocarbon solvent therefrom, adding a low vapor pressure base oil and a specific dispersing agent to the fine particles of N-polyalkylenepolyamine-substituted alkenylsuccinimide-coated ferrite as the residues and subjecting the resulting mixture to a dispersion treatment.

REFERENCES:
patent: Re32573 (1988-01-01), Furumura et al.
patent: 3549396 (1970-12-01), Dietz
patent: 3917538 (1975-11-01), Rosenweig
patent: 4430239 (1984-02-01), Wyman
patent: 4604222 (1986-08-01), Borduz et al.
patent: 4687596 (1987-08-01), Borduz et al.

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