Electric field responsive fluids

Details Electric field responsive fluids Electric field responsive fluids

1983-03-14

1984-11-20

Lieberman, Paul

Compositions

Fluent dielectric

O-containing

252 58, 252 73, 252 76, 252 79, 252308, 2523151, 252581, 528165, H01B 320, C10M 108

Patent

active

044837887

ABSTRACT:
An electroviscous (EV) fluid composition whose fluid properties are altered in the presence of an electric field comprises water-containing particles of a phenol-formaldehyde polymer dispersed in a non-conducting liquid. The composition, selected from the broad range of fluid compositions of UK Pat. No. 1570234, possesses improved fluid properties combined with markedly reduced electrical conductivity, and is thus more suitable for use in applications such as at the interface between electronics and power hydraulics for example.
In a preferred embodiment of the present invention the polymer comprises the dilithium salt of 2,2', 4,4' tetrahydroxybenzophenone condensed with formaldehyde, dispersed at 30% V/V in a mixture of brominated diphenyl methane (BDM) liquid components having the averaged formula C.sub.6 H.sub.4 Br.CH.sub.2.C.sub.6 H.sub.5.

REFERENCES:
patent: 2165813 (1939-07-01), Prutton
patent: 3472782 (1969-10-01), Nowotny
patent: 4033892 (1977-07-01), Stangroom
patent: 4260506 (1981-04-01), Munch et al.

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