Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1990-12-27
1993-01-12
Buffalow, Edith
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
428692, 523212, B32B 904, B32B 1904, B32B 2704
Patent
active
051789477
ABSTRACT:
Magnetizable composite microspheres comprising a core of a magnetizable filler distributed uniformly in a network of a polysilsesquioxane SiVi containing double bonds and a shell of a crosslinked organosilicon polymer derived from the hydrosilylation of an organohydrogenopolysiloxane SiH with the ethylenically unsaturated groups of the polysilsesquioxane. The magnetizable composite microspheres are obtained by dispersing an aqueous suspension of a magnetizable filler, not coated with a dispersing agent, in a solvent, dissolving an alkoxysilane or an alkoxysiloxane containing double bonds, polycondensing to a SiVi group-containing polysilsesquioxane SiVi, removing water, dissolving the organohydrogenopolysiloxane SiH polymer in the organic phase, crosslinking the mixture of polymers, removing water, separating the microspheres and, if appropriate, redispersing the microspheres in water. The magnetizable composite microspheres are preferably used as an active supports in biology.
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Charmot Dominique
Thibon Andre
Buffalow Edith
Nakarani D. S.
Rhone-Poulenc Chimie
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