Magnetizable microspheres based on a polysilsesquioxane and a process for their preparation
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United States of America Patent
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Jul 7, 1992
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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 microspheres comprising a polysilsesquioxane network and, distributed within the network, a magnetizable filler chemically bonded to polysilsesquioxane units. The magnetizable microspheres are prepared by dispersing an aqueous suspension of a magnetizable filler, not coated with a dispersing agent, in a solvent, dissolving an alkoxysilane or an alkoxysiloxane in the organic phase, polycondensating to a polysilsesquioxane, removing water, separating, and optionally redispersing the microspheres in water.
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