Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Reexamination Certificate
2007-08-13
2009-06-30
Kiliman, Leszek (Department: 1794)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
C428S404000, C428S405000, C428S406000, C428S407000, C427S212000
Reexamination Certificate
active
07553542
ABSTRACT:
The present invention discloses a two-stage process for preparing functionalized magnetizable microspheres. The first stage includes forming an inner shell of styrene polymer or styrene copolymer around magnetizable nano particles having a monolayer of a non-water-soluble dispersing agent coated thereon. The second stage includes forming an outer shell of styrene polymer or styrene copolymer with sulfate (SO4−) bounded thereto around the inner shell by free radical polymerization. Preferably, nano particles of a noble metal are deposited on the surface of the outer shell. The magnetizable microspheres prepared by the process of the present invention have a size of 100-1000 nm, and the thickness ratio of the inner shell to the outer shell ranges from 10:1 to 1:10.
REFERENCES:
patent: 5356713 (1994-10-01), Charmot et al.
patent: 5976426 (1999-11-01), Richard et al.
Chang Chang-Ping
Chen Yan-Cheng
Ger Ming-Der
Hsiao Szu-Ching
Ou Jinn-Luh
Bacon & Thomas PLLC
Kiliman Leszek
National Defense University
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