Magnetizable composite microspheres of hydrophobic crosslinked polymer, process for preparing them and their application in biology
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United States of America Patent
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Oct 18, 1994
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app pub date -
Jun 1, 1993
filing date -
Mar 31, 1989
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Abstract
Magnetizable composite microspheres approximately from 0.05 to 10 .mu.m in diameter, comprising a core of magnetizable particles and a shell of a hydrophobic crosslinked copolymer formed from a vinylaromatic monomer and a crosslinking emulsifying polymer. The microspheres are obtained by the pre-emulsification in water of a magnetic fluid composed of magnetizable particles dispersed in a vinylaromatic monomer and in a crosslinking emulsifying polymer, polymerization, separation of the magnetizable microspheres and optional redispersion in water. The microspheres are useful in biological applications.
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