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US 5,470,498 AGranted
Polymeric salts as dispersed particles in electrorheological fluids
AssigneeThe Lubrizol Corporation
InventorsJoseph W. Pialet, Kasturi Lal, Charles P. Bryant
Life of this patent
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Abstract
Electrorheological fluids which exhibit good high temperature performance are made using as the disperse phase a salt of a polymer of an alkenyl substituted aromatic comonomer such as styrene and a maleic acid comonomer or derivative thereof.
Claims29
An electrorheological fluid comprising (a) a hydrophobic liquid phase which comprises a liquid which is stable up to 120.degree. C., said liquid being an oil selected from the group consisting of silicone oils, vegetable oils, and synthetic esters;
- and (b) particles of a polymer dispersed therein, said polymer comprising an alkenyl substituted aromatic comonomer, a maleic acid comonomer or derivative thereof, and 0 to about 20 mole percent of at least one third comonomer, wherein the polymer contains acid functionality which is at least partly in the form of a salt.
Dependencies are inferred from the claim text.