Magnetic polymer latices and process for the preparation...

Details Magnetic polymer latices and process for the preparation... Magnetic polymer latices and process for the preparation...

C - Chemistry, Metallurgy

09

K

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C09K 3/00 (2006.01) C08F 2/44 (2006.01) C08F 12/02 (2006.01) G01N 33/543 (2006.01) G11B 5/702 (2006.01)

Patent

CA 1159247

ABSTRACT Magnetic polymer latices are disclosed having a concentration below 65% by weight of particles between 0.03 and 5 µm in diameter consisting of hydrophobic vinyl aromatic polymers and containing between 0.5 and 50% by weight of magnetically charged particles based on the polymer. A process is disclosed for the preparation of the latices, consisting of dispersing a magnetic charge in an organic phase consisting of an organo-soluble initiator; all or part of a vinyl aromatic monomer, alone or in admixture with at least one copolymerizable monomer producing a hydrophobic polymer; and/or an organic compound insoluble in water; mixing the dispersion obtained with all or part of an aqueous solution containing an emulsifying agent; emulsifying the mixture and polymerizing it after eventual addition of the remainder of the constituents. The latices are useful in the paint, magnetic tape and recording industries and in biological applications.

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