Compositions – Magnetic – With wax – bitumen – resin – or gum
Patent
1990-10-31
1992-04-28
Lewis, Michael
Compositions
Magnetic
With wax, bitumen, resin, or gum
252 6253, 428403, 428405, 435176, 435180, 435188, H01F 126, H01F 128, C12N 1108, C12N 1114
Patent
active
051086360
ABSTRACT:
Magnetizable composite particles, optionally in aqueous dispersion, consisting of a matrix based on a crosslinked organopolysiloxane, optionally bearing nonvinyl reactive and/or ionic units and magnetizable components less than 300 angstroms in diameter encapsulated in the matrix. The magnetizable composite particles are prepared by homogenizing a solution of the organopolysiloxane, an organohydrogenopolysiloxane optionally bearing ionic and/or reactive units, and a magnetic fluid, in the presence of water and a surfactant, performing a hydrosilylation in an aqueous emulsion, removing the organic solvents and the organic carrier liquid, and at least partially removing the water. The magnetizable composite particles are useful in biological applications.
REFERENCES:
patent: Re32573 (1988-01-01), Furumura et al.
patent: 4271234 (1981-06-01), Shonafinger et al.
patent: 4356098 (1982-10-01), Chagnon
patent: 4695392 (1987-09-01), Whitehead et al.
patent: 4695393 (1987-09-01), Whitehead et al.
patent: 4874667 (1989-10-01), Lee et al.
patent: 4876039 (1989-10-01), Lo et al.
Leising Frederic
Torres Ghislaine
Kalinchak Stephen G.
Lewis Michael
Rhone-Poulenc Chimie
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