Magnetic fluid composition

Details Magnetic fluid composition Magnetic fluid composition

1990-10-24

1992-06-23

Willis, Jr., Prince

Compositions

Magnetic

Chromium or chromium compound containing

C09D 523

Patent

active

051240602

ABSTRACT:
A magnetic fluid composition comprising a less volatile organic solvent as a dispersing medium, a dispersing agent having oleophilic groups exhibiting an affinity therewith, fine ferromagnetic particles coated at the surface thereof with the dispersing agent and dispersed in the less volatile organic solvent and a fluorocarbon surface active material having an organophobic portion and an organophilic portion together in a unitary molecular structure. The magnetic fluid is prepared by the steps of adding the low boiling organic solvent and the dispersant having oleophilic groups to fine ferromagnetic particles to obtain an intermediate medium, separating the fine particles of poor dispersibility from the intermediate medium and, then adding the less volatile organic solvent and heating the resulting material to evaporate the low boiling organic solvent thereby obtaining a magnetic fluid and, further, adding the fluorocarbon surface active material to the magnetic fluid. The magnetic fluid composition can be used for sealing devices in computer hard disk driver or vacuum apparatus.

REFERENCES:
patent: 3784471 (1974-01-01), Kaiser
patent: 3917538 (1975-11-01), Rosenzweig
patent: 4405684 (1983-09-01), Blumentritt
patent: 4624797 (1986-11-01), Wakayama
patent: 4938886 (1990-07-01), Lindsten

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