| 摘要 |
PURPOSE:To provide the title fluid excellent in current characteristics, dispersion stability and fluidity, useful for clutches, etc., comprising each specific disperse phase, dispersion medium and polymeric additive prepared by polymerizing a vinyl monomer in the presence of a polymer carrying at its one end vinyl group. CONSTITUTION:The objective fluid comprising (A) 100 pts.wt. of a disperse phase consisting of organic polymer granules with cation exchange ability such as a sulfonic acid group-contg. polystyrene-based polymer ones, (B) pref. 50-500 pts.wt. of a dispersion medium consisting of an electrical insulating fluid mainly of a hydrocarbon compound such as dodecane, and (C) pref. 0.1-60 pts.wt. of a polymeric additive prepared by polymerizing a vinyl monomer such as styrene in the presence of a polymer carrying at its one end vinyl group, made up of structural unit of formula I (R<1> and R<2> are each H or methyl) and/or formula II (R<3> is H or methyl; X is aromatic hydrocarbon or substituent having O or N). |
