Fluorine-based magnetic fluid

Details Fluorine-based magnetic fluid Fluorine-based magnetic fluid

1997-01-15

1998-02-17

Bonner, Melissa

Compositions

Magnetic

Flaw detection or magnetic clutch

252 6254, H01F 144

Patent

active

057188335

ABSTRACT:
A fluorine-based magnetic fluid, which comprises (A) fine magnetic particles as dispersed in (D) a perfluoropolyether base oil represented by the following general formula:
where Rf is a perfluoroalkyl group, by means of (B) a salt of perfluoroether carboxylic acid represented by the following general formula:
where M is an alkali metal or an ammonium group, and (C) amide compounds of perfluoroether carboxylic acid represented by the following general formula:
has a high affinity of the fine magnetic particles toward the perfluoropolyether base oil and is effectively used as a sealing material for vacuum apparatus.

REFERENCES:
patent: 3784471 (1974-01-01), Kaiser

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