To obtain an elecrtroviscous fluid which is produced from relatively low-cost compds., works at room temp., and can be used for a long term by dispersing a liq. org. polymer in an insulating oil to form an emulsion.
An electroviscous fluid is obtd. by dispersing 5-50wt.% liq. org. polar polymer in 50-95wt.% insulating oil to form an emulsion. The polar polymer is represented by a modified silicone oil formed by introducing polar groups such as amino, epoxy, or alkoxy groups into the molecular ends and/or side chains of a silicone oil, that is, an alkylopolysiloxane liq. at room temp. such as dimethylpolysiloxane commercially available as a fiber treatment or as a material for various silicone resins. The insulating oil is a nonpolar silicone oil or hydrocarbon oil, does not become electrically conductive by applying voltage, and has a viscosity lower than that of the modified silicone oil.
YAMASHITA YUKIYA
OTA YUJI
