Process for the preparation of magnetic beads of vinylaromatic polymers
AssigneeRhone-Poulenc Industries
InventorsMarc Tricot, Jean-Claude Daniel
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Abstract
Process for the preparation of magnetic beads of vinylaromatic polymers, which comprises dispersing a magnetic filler in a solution of a homo- or co-polymer in a vinylaromatic compound alone or in mixture with a co-polymerizable monomer, putting the resulting dispersion into suspension in water and polymerizing the monomer or monomers, and use of said magnetic beads in the paints, inks, reprography and in biology.
Claims14
A process for the preparation of magnetic beads of vinylaromatic polymers in which vinylaromatic monomers alone or in admixture with a copolymerizable monomer is polymerized in the presence of an initiator, a suspension agent and a magnetic filler comprising dispersing the magnetic filler in an organic phase in the form of a solution of at least one water insoluble homo- or co-polymer in the monomer(s), suspending the dispersion in aqueous medium, and then polymerizing the monomer(s) while still containing the homo- or co-polymer dissolved therein.
Dependencies are inferred from the claim text.