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US 5,516,445 AGranted
Fluid having magnetic and electrorheological effects simultaneously and
AssigneeNippon Oil Co., Ltd.
InventorsMakoto Sasaki, Katsuhiko Haji
Life of this patent
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Abstract
A fluid having both magnetic and electrorheological effects contains electroconductive ferromagnetic particles, the surfaces of which are coated with a particular electrically insulating layer having a critical thickness and electrical resistance, dispersed in an electrically non-conductive solvent.
Claims2
A fluid having magnetic and electrorheological effects simultaneously, which comprises:
- 1 to 90% by weight of dispersion particles comprising electrically conductive ferromagnetic particles having a particle size in the range of 0.003 to 200 .mu.m, the surfaces of which are coated with an electrically insulating layer of a polyethylene, polystyrene, polymethacrylate, wax, asphalt, drying oil varnish, silica, alumina or titanium oxide, said insulating layer having a thickness in the range of 0.001 to 10 .mu.m and an electrical resistance of at least 10.sup.8 .OMEGA.cm at 20.degree. C.;
- and
- 99 to 10% by weight of an electrically insulating solvent.
Dependencies are inferred from the claim text.