COLORED MAGNETIC PARTICLES FOR MAGNETIC MIGRATION DISPLAY AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To obtain colored magnetic particles for magnetic migration display which is good in saturation and enables the multiple coloration of a magnetic migration display without contaminating a dispersion medium. SOLUTION: The magnetic particles included in the plastic dispersant sealed into the respective cells of a honeycomb core constituting a panel for display consist of the following requirements: (a) To have colored layers by a coating material 3 composed of chromatic pigments and a synthetic resin on the surface of the magnetic particles 2; (b) to be 35 to 65 emu/g in the magnification in a colored state and (c) to be >=90 wt.% in the particle size of 50 to 130μm in the colored state.