Patent ID: 6420469
Filing Date: 2002-07-16
Classification: C08J

Abstract:
A method for manufacturing electrorheological fine particle-on-particle dispersion, comprising the steps of:fusing under heat and dispersing a thermoplastic resin containing a coloring material, with a mixture ratio of resin 50 to 99% and coloring material 50 to 1%, in a solvent which dissolves the resin when heated but does not dissolve the resin at room temperature, wherein a difference &Dgr;SP value between a solubility parameter (SP) value of the resin itself and the SP value of the solvent is adjusted to be within +0.96; cooling said resin-containing system to precipitate the coloring-material-containing resin particles; adding inorganic fine particles to the system, followed by heating again the system to achieve a sufficient mixing; and cooling the system to permit said inorganic fine particles to be attached to or contained in surface layers of the coloring-material-containing resin particles.