Flynn, Thiel, Boutell & Tanis
Surface treatment method for magnetic particles
 A surface treatment method for magnetic particles is disclosed, which comprises the steps of activating magnetic particles by application of heat thereto, treating the surface of the magnetic particles with a reactive silane coupling agent, bringing the treated magnetic particles into contact with at least one polymerizable vinyl-type monomer, polymerizing the monomer to form a polymer, and coating the surface of the magnetic particles with the polymer. 
Ricoh Company, Ltd.
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Kenkichi Hiroshi
Muto Yamashita