Electrorheological fluids containing particles of a polar solid

Details Electrorheological fluids containing particles of a polar solid Electrorheological fluids containing particles of a polar solid

1994-08-19

1996-03-26

Lieberman, Paul

Compositions

Heat-exchange, low-freezing or pour point, or high boiling...

Organic components

252 77, 252572, C10M10736, C10M10102, C10M14900

Patent

active

055018092

ABSTRACT:
An electrorheological fluid is prepared from a hydrophobic liquid medium and a dispersed particulate phase of (i) a polar solid material which is capable of exhibiting electrorheological activity in the presence of a low molecular weight polar material and (ii) a non-cellulosic polymeric material having a solubility parameter of about 15 to about 50 (MPa).sup.1/2 and exhibiting substantially no electrorheological activity in the absence of a low molecular weight polar material. The fluid optionally contains a low molecular weight polar activator. The fluid has good electrorheological performance over a broad temperature range.

REFERENCES:
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patent: 3348958 (1967-10-01), Cockerhann et al.
patent: 3711433 (1973-01-01), Willey
patent: 3992558 (1976-11-01), Smith-Johannsen
patent: 4668417 (1987-05-01), Goossens
patent: 4781978 (1988-11-01), Duan
patent: 4992192 (1991-02-01), Ahmed
patent: 5073282 (1991-12-01), Ahmed
patent: 5213895 (1993-05-01), Hirai et al.
patent: 5266230 (1993-11-01), Tomizawa et al.
patent: 5286413 (1994-02-01), Hannecart et al.

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