| 摘要 |
PURPOSE:To obtain the subject electroviscous fluid composition having a high electroviscous effect, excellent in storage stability, heat resistance, durability and scuffing resistance, exhibiting a stable current value and low in consumption of electric power by dispersing a specified nonhydraus composite particle in an electroviscous insulating medium. CONSTITUTION:In this electroviscous fluid composition, (A) a nonhydraus composite particle (preferably having 1 to 50mum average particle size) prepared by coating an organic polymer compound particle (e.g. sulfonated cross-linked divinylbenzene polymer particle) having amino groups and/or oxygen-containing functional groups (preferably sulfonic acid group, hydroxyl group, etc.) on the surface with a semiconductor and/or an insulating material is contained in (B) an electric insulating medium (e.g. diphenyl chloride) and the content of the component (A) is preferably 10 to 60wt.%. In addition, preparation of the component (A) is carried out recommendably, e.g. by producing the polymer particle according to, e.g. a method for polymerization of a functional group- containing monomer and subsequently forming a coating layer composed of a semiconductor and/or an insulating material such as titanium oxide, copper oxide or In2O-SnO on the particle surface according to the hydrolysis method. |
