Coated magnetizable microparticles, reversible suspensions thereof, and processes relating thereto
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United States of America Patent
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Jun 12, 1984
Grant Date -
N/A
app pub date -
Dec 30, 1981
filing date -
Dec 30, 1981
priority date (Note) -
Expired
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Abstract
Coated magnetizable particles of sub-micron size are used to form reversible suspensions in which the particles may be magnetically aggregated and thereafter resuspended as desired. Each microparticle comprises a core composed essentially of a magnetically-responsive material having a Curie temperature within the range of about 5.degree. to 65.degree. C. and a magnetic moment at saturation of at least 2.0 .mu..sub.B at 4.2.degree. K., and a coating about the core formed of a solid cross-linked polymeric material having chemically reactive groups at the surface thereof.
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