Process for the preparation of magnetizable microspheres based o

Details Process for the preparation of magnetizable microspheres based o Process for the preparation of magnetizable microspheres based o

1990-06-13

1991-07-23

Straub, Gary P.

Compositions

Magnetic

With wax, bitumen, resin, or gum

428403, 428405, 435176, 435180, 435188, H01F 126, C12N 1102, C12N 1114

Patent

active

050341456

ABSTRACT:
Magnetizable microspheres, optionally in aqueous dispersion, consisting of a matrix of at least one organopolysiloxane optionally bearing Si-vinyl groups or reactive and/or ionic units and magnetizable particles less than 300 angstroms in diameter encapsulated in the matrix. The magnetizable microspheres are prepared by homogenizing a solution of the organopolysiloxane and a magnetic fluid in the presence of water and a surfactant, removing the solvent for the organopolysiloxane and the carrier liquid of the magnetic fluid, and at least partially removing the water. The magnetizable microspheres are useful in biological applications as active supports.

REFERENCES:
patent: 3652761 (1972-03-01), Weetall
patent: 4356098 (1982-10-01), Chagnon
patent: 4695392 (1987-09-01), Whitehead et al.
Rhone-Poulenc Technical Bulletin, 3/3/87.

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