Abstract
A magnetic particle dispersion was prepared by mixing the magnetic γ- Fe 2 O 3 particles or barium-ferrite particles and epoxy resin with solvent. The relationship between the mixing conditions and the adsorbed amount of the epoxy resin on the particle surface was investigated. It became clear that the polymer adsorption occurring during the mixing process required both large mechanical shear and high temperature. The large mechanical shear was necessary to break the coagulation of the particles and high temperature was necessary to cause chemical reaction between the polymer and the particle surface. The adsorbed polymer improved dispersibility of the particles in the dispersion, which was confirmed by transmission electron micrograph, viscosity measurement and surface roughness measurement of the coated films made from the dispersions.
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