Stable electro-rheological fluid having a high viscosity-increasing effect

摘要

An electro-rheological fluid comprising an electrically insulating liquid as the dispersion medium, porous solid particles as the dispersed phase, a dispersant, and a polyhydric alcohol having a boiling point of not lower than 250 DEG C., a melting point of not higher than 15 DEG C. and a viscosity of not higher than 300 cp (as measured at 20 DEG C.), or comprising an electrically insulating liquid as the dispersion medium, porous solid particles as the dispersed phase, a polyhydric alcohol and/or water, and an ashless dispersant.