Magnetizable "core-shell" microspheres based on a cross-linked organopolysiloxane and a process for their preparation
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United States of America Patent
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Aug 3, 1993
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N/A
app pub date -
Dec 27, 1990
filing date -
Dec 27, 1989
priority date (Note) -
Expired
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Abstract
Magnetizable 'core-shell' microspheres comprising a core of a magnetizable filler and a shell of crosslinked organopolysiloxane obtained by dispersing an aqueous suspension of a magnetizable filler, not coated with a dispersing agent, in an organic solvent, dissolving an organopolysiloxane and an organohydrogenpolysiloxane in the organic phase, crosslinking, removing water, separating and, if appropriate, redispersing the magnetizable microspheres in water.
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